| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S E M _ C H 6 -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 1992-2019, Free Software Foundation, Inc. -- |
| -- -- |
| -- GNAT is free software; you can redistribute it and/or modify it under -- |
| -- terms of the GNU General Public License as published by the Free Soft- -- |
| -- ware Foundation; either version 3, or (at your option) any later ver- -- |
| -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
| -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- |
| -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- |
| -- for more details. You should have received a copy of the GNU General -- |
| -- Public License distributed with GNAT; see file COPYING3. If not, go to -- |
| -- http://www.gnu.org/licenses for a complete copy of the license. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| with Aspects; use Aspects; |
| with Atree; use Atree; |
| with Checks; use Checks; |
| with Contracts; use Contracts; |
| with Debug; use Debug; |
| with Einfo; use Einfo; |
| with Elists; use Elists; |
| with Errout; use Errout; |
| with Expander; use Expander; |
| with Exp_Ch6; use Exp_Ch6; |
| with Exp_Ch7; use Exp_Ch7; |
| with Exp_Ch9; use Exp_Ch9; |
| with Exp_Dbug; use Exp_Dbug; |
| with Exp_Tss; use Exp_Tss; |
| with Exp_Util; use Exp_Util; |
| with Freeze; use Freeze; |
| with Ghost; use Ghost; |
| with Inline; use Inline; |
| with Itypes; use Itypes; |
| with Lib.Xref; use Lib.Xref; |
| with Layout; use Layout; |
| with Namet; use Namet; |
| with Lib; use Lib; |
| with Nlists; use Nlists; |
| with Nmake; use Nmake; |
| with Opt; use Opt; |
| with Output; use Output; |
| with Restrict; use Restrict; |
| with Rident; use Rident; |
| with Rtsfind; use Rtsfind; |
| with Sem; use Sem; |
| with Sem_Aux; use Sem_Aux; |
| with Sem_Cat; use Sem_Cat; |
| with Sem_Ch3; use Sem_Ch3; |
| with Sem_Ch4; use Sem_Ch4; |
| with Sem_Ch5; use Sem_Ch5; |
| with Sem_Ch8; use Sem_Ch8; |
| with Sem_Ch9; use Sem_Ch9; |
| with Sem_Ch10; use Sem_Ch10; |
| with Sem_Ch12; use Sem_Ch12; |
| with Sem_Ch13; use Sem_Ch13; |
| with Sem_Dim; use Sem_Dim; |
| with Sem_Disp; use Sem_Disp; |
| with Sem_Dist; use Sem_Dist; |
| with Sem_Elim; use Sem_Elim; |
| with Sem_Eval; use Sem_Eval; |
| with Sem_Mech; use Sem_Mech; |
| with Sem_Prag; use Sem_Prag; |
| with Sem_Res; use Sem_Res; |
| with Sem_Util; use Sem_Util; |
| with Sem_Type; use Sem_Type; |
| with Sem_Warn; use Sem_Warn; |
| with Sinput; use Sinput; |
| with Stand; use Stand; |
| with Sinfo; use Sinfo; |
| with Sinfo.CN; use Sinfo.CN; |
| with Snames; use Snames; |
| with Stringt; use Stringt; |
| with Style; |
| with Stylesw; use Stylesw; |
| with Tbuild; use Tbuild; |
| with Uintp; use Uintp; |
| with Urealp; use Urealp; |
| with Validsw; use Validsw; |
| |
| package body Sem_Ch6 is |
| |
| May_Hide_Profile : Boolean := False; |
| -- This flag is used to indicate that two formals in two subprograms being |
| -- checked for conformance differ only in that one is an access parameter |
| -- while the other is of a general access type with the same designated |
| -- type. In this case, if the rest of the signatures match, a call to |
| -- either subprogram may be ambiguous, which is worth a warning. The flag |
| -- is set in Compatible_Types, and the warning emitted in |
| -- New_Overloaded_Entity. |
| |
| ----------------------- |
| -- Local Subprograms -- |
| ----------------------- |
| |
| procedure Analyze_Function_Return (N : Node_Id); |
| -- Subsidiary to Analyze_Return_Statement. Called when the return statement |
| -- applies to a [generic] function. |
| |
| procedure Analyze_Generic_Subprogram_Body (N : Node_Id; Gen_Id : Entity_Id); |
| -- Analyze a generic subprogram body. N is the body to be analyzed, and |
| -- Gen_Id is the defining entity Id for the corresponding spec. |
| |
| procedure Analyze_Null_Procedure |
| (N : Node_Id; |
| Is_Completion : out Boolean); |
| -- A null procedure can be a declaration or (Ada 2012) a completion |
| |
| procedure Analyze_Return_Statement (N : Node_Id); |
| -- Common processing for simple and extended return statements |
| |
| procedure Analyze_Return_Type (N : Node_Id); |
| -- Subsidiary to Process_Formals: analyze subtype mark in function |
| -- specification in a context where the formals are visible and hide |
| -- outer homographs. |
| |
| procedure Analyze_Subprogram_Body_Helper (N : Node_Id); |
| -- Does all the real work of Analyze_Subprogram_Body. This is split out so |
| -- that we can use RETURN but not skip the debug output at the end. |
| |
| function Can_Override_Operator (Subp : Entity_Id) return Boolean; |
| -- Returns true if Subp can override a predefined operator. |
| |
| procedure Check_Conformance |
| (New_Id : Entity_Id; |
| Old_Id : Entity_Id; |
| Ctype : Conformance_Type; |
| Errmsg : Boolean; |
| Conforms : out Boolean; |
| Err_Loc : Node_Id := Empty; |
| Get_Inst : Boolean := False; |
| Skip_Controlling_Formals : Boolean := False); |
| -- Given two entities, this procedure checks that the profiles associated |
| -- with these entities meet the conformance criterion given by the third |
| -- parameter. If they conform, Conforms is set True and control returns |
| -- to the caller. If they do not conform, Conforms is set to False, and |
| -- in addition, if Errmsg is True on the call, proper messages are output |
| -- to complain about the conformance failure. If Err_Loc is non_Empty |
| -- the error messages are placed on Err_Loc, if Err_Loc is empty, then |
| -- error messages are placed on the appropriate part of the construct |
| -- denoted by New_Id. If Get_Inst is true, then this is a mode conformance |
| -- against a formal access-to-subprogram type so Get_Instance_Of must |
| -- be called. |
| |
| procedure Check_Limited_Return |
| (N : Node_Id; |
| Expr : Node_Id; |
| R_Type : Entity_Id); |
| -- Check the appropriate (Ada 95 or Ada 2005) rules for returning limited |
| -- types. Used only for simple return statements. Expr is the expression |
| -- returned. |
| |
| procedure Check_Subprogram_Order (N : Node_Id); |
| -- N is the N_Subprogram_Body node for a subprogram. This routine applies |
| -- the alpha ordering rule for N if this ordering requirement applicable. |
| |
| procedure Check_Returns |
| (HSS : Node_Id; |
| Mode : Character; |
| Err : out Boolean; |
| Proc : Entity_Id := Empty); |
| -- Called to check for missing return statements in a function body, or for |
| -- returns present in a procedure body which has No_Return set. HSS is the |
| -- handled statement sequence for the subprogram body. This procedure |
| -- checks all flow paths to make sure they either have return (Mode = 'F', |
| -- used for functions) or do not have a return (Mode = 'P', used for |
| -- No_Return procedures). The flag Err is set if there are any control |
| -- paths not explicitly terminated by a return in the function case, and is |
| -- True otherwise. Proc is the entity for the procedure case and is used |
| -- in posting the warning message. |
| |
| procedure Check_Untagged_Equality (Eq_Op : Entity_Id); |
| -- In Ada 2012, a primitive equality operator on an untagged record type |
| -- must appear before the type is frozen, and have the same visibility as |
| -- that of the type. This procedure checks that this rule is met, and |
| -- otherwise emits an error on the subprogram declaration and a warning |
| -- on the earlier freeze point if it is easy to locate. In Ada 2012 mode, |
| -- this routine outputs errors (or warnings if -gnatd.E is set). In earlier |
| -- versions of Ada, warnings are output if Warn_On_Ada_2012_Incompatibility |
| -- is set, otherwise the call has no effect. |
| |
| procedure Enter_Overloaded_Entity (S : Entity_Id); |
| -- This procedure makes S, a new overloaded entity, into the first visible |
| -- entity with that name. |
| |
| function Is_Non_Overriding_Operation |
| (Prev_E : Entity_Id; |
| New_E : Entity_Id) return Boolean; |
| -- Enforce the rule given in 12.3(18): a private operation in an instance |
| -- overrides an inherited operation only if the corresponding operation |
| -- was overriding in the generic. This needs to be checked for primitive |
| -- operations of types derived (in the generic unit) from formal private |
| -- or formal derived types. |
| |
| procedure Make_Inequality_Operator (S : Entity_Id); |
| -- Create the declaration for an inequality operator that is implicitly |
| -- created by a user-defined equality operator that yields a boolean. |
| |
| procedure Preanalyze_Formal_Expression (N : Node_Id; T : Entity_Id); |
| -- Preanalysis of default expressions of subprogram formals. N is the |
| -- expression to be analyzed and T is the expected type. |
| |
| procedure Set_Formal_Validity (Formal_Id : Entity_Id); |
| -- Formal_Id is an formal parameter entity. This procedure deals with |
| -- setting the proper validity status for this entity, which depends on |
| -- the kind of parameter and the validity checking mode. |
| |
| --------------------------------------------- |
| -- Analyze_Abstract_Subprogram_Declaration -- |
| --------------------------------------------- |
| |
| procedure Analyze_Abstract_Subprogram_Declaration (N : Node_Id) is |
| Scop : constant Entity_Id := Current_Scope; |
| Subp_Id : constant Entity_Id := |
| Analyze_Subprogram_Specification (Specification (N)); |
| |
| begin |
| Check_SPARK_05_Restriction ("abstract subprogram is not allowed", N); |
| |
| Generate_Definition (Subp_Id); |
| |
| -- Set the SPARK mode from the current context (may be overwritten later |
| -- with explicit pragma). |
| |
| Set_SPARK_Pragma (Subp_Id, SPARK_Mode_Pragma); |
| Set_SPARK_Pragma_Inherited (Subp_Id); |
| |
| -- Preserve relevant elaboration-related attributes of the context which |
| -- are no longer available or very expensive to recompute once analysis, |
| -- resolution, and expansion are over. |
| |
| Mark_Elaboration_Attributes |
| (N_Id => Subp_Id, |
| Checks => True, |
| Warnings => True); |
| |
| Set_Is_Abstract_Subprogram (Subp_Id); |
| New_Overloaded_Entity (Subp_Id); |
| Check_Delayed_Subprogram (Subp_Id); |
| |
| Set_Categorization_From_Scope (Subp_Id, Scop); |
| |
| if Ekind (Scope (Subp_Id)) = E_Protected_Type then |
| Error_Msg_N ("abstract subprogram not allowed in protected type", N); |
| |
| -- Issue a warning if the abstract subprogram is neither a dispatching |
| -- operation nor an operation that overrides an inherited subprogram or |
| -- predefined operator, since this most likely indicates a mistake. |
| |
| elsif Warn_On_Redundant_Constructs |
| and then not Is_Dispatching_Operation (Subp_Id) |
| and then not Present (Overridden_Operation (Subp_Id)) |
| and then (not Is_Operator_Symbol_Name (Chars (Subp_Id)) |
| or else Scop /= Scope (Etype (First_Formal (Subp_Id)))) |
| then |
| Error_Msg_N |
| ("abstract subprogram is not dispatching or overriding?r?", N); |
| end if; |
| |
| Generate_Reference_To_Formals (Subp_Id); |
| Check_Eliminated (Subp_Id); |
| |
| if Has_Aspects (N) then |
| Analyze_Aspect_Specifications (N, Subp_Id); |
| end if; |
| end Analyze_Abstract_Subprogram_Declaration; |
| |
| --------------------------------- |
| -- Analyze_Expression_Function -- |
| --------------------------------- |
| |
| procedure Analyze_Expression_Function (N : Node_Id) is |
| Expr : constant Node_Id := Expression (N); |
| Loc : constant Source_Ptr := Sloc (N); |
| LocX : constant Source_Ptr := Sloc (Expr); |
| Spec : constant Node_Id := Specification (N); |
| |
| -- Local variables |
| |
| Asp : Node_Id; |
| New_Body : Node_Id; |
| New_Spec : Node_Id; |
| Orig_N : Node_Id; |
| Ret : Node_Id; |
| |
| Def_Id : Entity_Id := Empty; |
| Prev : Entity_Id; |
| -- If the expression is a completion, Prev is the entity whose |
| -- declaration is completed. Def_Id is needed to analyze the spec. |
| |
| -- Start of processing for Analyze_Expression_Function |
| |
| begin |
| -- This is one of the occasions on which we transform the tree during |
| -- semantic analysis. If this is a completion, transform the expression |
| -- function into an equivalent subprogram body, and analyze it. |
| |
| -- Expression functions are inlined unconditionally. The back-end will |
| -- determine whether this is possible. |
| |
| Inline_Processing_Required := True; |
| |
| -- Create a specification for the generated body. This must be done |
| -- prior to the analysis of the initial declaration. |
| |
| New_Spec := Copy_Subprogram_Spec (Spec); |
| Prev := Current_Entity_In_Scope (Defining_Entity (Spec)); |
| |
| -- If there are previous overloadable entities with the same name, |
| -- check whether any of them is completed by the expression function. |
| -- In a generic context a formal subprogram has no completion. |
| |
| if Present (Prev) |
| and then Is_Overloadable (Prev) |
| and then not Is_Formal_Subprogram (Prev) |
| then |
| Def_Id := Analyze_Subprogram_Specification (Spec); |
| Prev := Find_Corresponding_Spec (N); |
| |
| -- The previous entity may be an expression function as well, in |
| -- which case the redeclaration is illegal. |
| |
| if Present (Prev) |
| and then Nkind (Original_Node (Unit_Declaration_Node (Prev))) = |
| N_Expression_Function |
| then |
| Error_Msg_Sloc := Sloc (Prev); |
| Error_Msg_N ("& conflicts with declaration#", Def_Id); |
| return; |
| end if; |
| end if; |
| |
| Ret := Make_Simple_Return_Statement (LocX, Expr); |
| |
| New_Body := |
| Make_Subprogram_Body (Loc, |
| Specification => New_Spec, |
| Declarations => Empty_List, |
| Handled_Statement_Sequence => |
| Make_Handled_Sequence_Of_Statements (LocX, |
| Statements => New_List (Ret))); |
| Set_Was_Expression_Function (New_Body); |
| |
| -- If the expression completes a generic subprogram, we must create a |
| -- separate node for the body, because at instantiation the original |
| -- node of the generic copy must be a generic subprogram body, and |
| -- cannot be a expression function. Otherwise we just rewrite the |
| -- expression with the non-generic body. |
| |
| if Present (Prev) and then Ekind (Prev) = E_Generic_Function then |
| Insert_After (N, New_Body); |
| |
| -- Propagate any aspects or pragmas that apply to the expression |
| -- function to the proper body when the expression function acts |
| -- as a completion. |
| |
| if Has_Aspects (N) then |
| Move_Aspects (N, To => New_Body); |
| end if; |
| |
| Relocate_Pragmas_To_Body (New_Body); |
| |
| Rewrite (N, Make_Null_Statement (Loc)); |
| Set_Has_Completion (Prev, False); |
| Analyze (N); |
| Analyze (New_Body); |
| Set_Is_Inlined (Prev); |
| |
| -- If the expression function is a completion, the previous declaration |
| -- must come from source. We know already that it appears in the current |
| -- scope. The entity itself may be internally created if within a body |
| -- to be inlined. |
| |
| elsif Present (Prev) |
| and then Is_Overloadable (Prev) |
| and then not Is_Formal_Subprogram (Prev) |
| and then Comes_From_Source (Parent (Prev)) |
| then |
| Set_Has_Completion (Prev, False); |
| Set_Is_Inlined (Prev); |
| |
| -- AI12-0103: Expression functions that are a completion freeze their |
| -- expression but don't freeze anything else (unlike regular bodies). |
| |
| -- Note that we cannot defer this freezing to the analysis of the |
| -- expression itself, because a freeze node might appear in a nested |
| -- scope, leading to an elaboration order issue in gigi. |
| -- As elsewhere, we do not emit freeze nodes within a generic unit. |
| |
| if not Inside_A_Generic then |
| Freeze_Expr_Types |
| (Def_Id => Def_Id, |
| Typ => Etype (Def_Id), |
| Expr => Expr, |
| N => N); |
| end if; |
| |
| -- For navigation purposes, indicate that the function is a body |
| |
| Generate_Reference (Prev, Defining_Entity (N), 'b', Force => True); |
| Rewrite (N, New_Body); |
| |
| -- Remove any existing aspects from the original node because the act |
| -- of rewriting causes the list to be shared between the two nodes. |
| |
| Orig_N := Original_Node (N); |
| Remove_Aspects (Orig_N); |
| |
| -- Propagate any pragmas that apply to expression function to the |
| -- proper body when the expression function acts as a completion. |
| -- Aspects are automatically transfered because of node rewriting. |
| |
| Relocate_Pragmas_To_Body (N); |
| Analyze (N); |
| |
| -- Once the aspects of the generated body have been analyzed, create |
| -- a copy for ASIS purposes and associate it with the original node. |
| |
| if Has_Aspects (N) then |
| Set_Aspect_Specifications (Orig_N, |
| New_Copy_List_Tree (Aspect_Specifications (N))); |
| end if; |
| |
| -- Prev is the previous entity with the same name, but it is can |
| -- be an unrelated spec that is not completed by the expression |
| -- function. In that case the relevant entity is the one in the body. |
| -- Not clear that the backend can inline it in this case ??? |
| |
| if Has_Completion (Prev) then |
| |
| -- The formals of the expression function are body formals, |
| -- and do not appear in the ali file, which will only contain |
| -- references to the formals of the original subprogram spec. |
| |
| declare |
| F1 : Entity_Id; |
| F2 : Entity_Id; |
| |
| begin |
| F1 := First_Formal (Def_Id); |
| F2 := First_Formal (Prev); |
| |
| while Present (F1) loop |
| Set_Spec_Entity (F1, F2); |
| Next_Formal (F1); |
| Next_Formal (F2); |
| end loop; |
| end; |
| |
| else |
| Set_Is_Inlined (Defining_Entity (New_Body)); |
| end if; |
| |
| -- If this is not a completion, create both a declaration and a body, so |
| -- that the expression can be inlined whenever possible. |
| |
| else |
| -- An expression function that is not a completion is not a |
| -- subprogram declaration, and thus cannot appear in a protected |
| -- definition. |
| |
| if Nkind (Parent (N)) = N_Protected_Definition then |
| Error_Msg_N |
| ("an expression function is not a legal protected operation", N); |
| end if; |
| |
| Rewrite (N, Make_Subprogram_Declaration (Loc, Specification => Spec)); |
| |
| -- Remove any existing aspects from the original node because the act |
| -- of rewriting causes the list to be shared between the two nodes. |
| |
| Orig_N := Original_Node (N); |
| Remove_Aspects (Orig_N); |
| |
| Analyze (N); |
| |
| -- Once the aspects of the generated spec have been analyzed, create |
| -- a copy for ASIS purposes and associate it with the original node. |
| |
| if Has_Aspects (N) then |
| Set_Aspect_Specifications (Orig_N, |
| New_Copy_List_Tree (Aspect_Specifications (N))); |
| end if; |
| |
| -- If aspect SPARK_Mode was specified on the body, it needs to be |
| -- repeated both on the generated spec and the body. |
| |
| Asp := Find_Aspect (Defining_Unit_Name (Spec), Aspect_SPARK_Mode); |
| |
| if Present (Asp) then |
| Asp := New_Copy_Tree (Asp); |
| Set_Analyzed (Asp, False); |
| Set_Aspect_Specifications (New_Body, New_List (Asp)); |
| end if; |
| |
| Def_Id := Defining_Entity (N); |
| Set_Is_Inlined (Def_Id); |
| |
| -- Establish the linkages between the spec and the body. These are |
| -- used when the expression function acts as the prefix of attribute |
| -- 'Access in order to freeze the original expression which has been |
| -- moved to the generated body. |
| |
| Set_Corresponding_Body (N, Defining_Entity (New_Body)); |
| Set_Corresponding_Spec (New_Body, Def_Id); |
| |
| -- Within a generic preanalyze the original expression for name |
| -- capture. The body is also generated but plays no role in |
| -- this because it is not part of the original source. |
| |
| if Inside_A_Generic then |
| Set_Has_Completion (Def_Id); |
| Push_Scope (Def_Id); |
| Install_Formals (Def_Id); |
| Preanalyze_Spec_Expression (Expr, Etype (Def_Id)); |
| End_Scope; |
| end if; |
| |
| -- To prevent premature freeze action, insert the new body at the end |
| -- of the current declarations, or at the end of the package spec. |
| -- However, resolve usage names now, to prevent spurious visibility |
| -- on later entities. Note that the function can now be called in |
| -- the current declarative part, which will appear to be prior to |
| -- the presence of the body in the code. There are nevertheless no |
| -- order of elaboration issues because all name resolution has taken |
| -- place at the point of declaration. |
| |
| declare |
| Decls : List_Id := List_Containing (N); |
| Expr : constant Node_Id := Expression (Ret); |
| Par : constant Node_Id := Parent (Decls); |
| Typ : constant Entity_Id := Etype (Def_Id); |
| |
| begin |
| -- If this is a wrapper created for in an instance for a formal |
| -- subprogram, insert body after declaration, to be analyzed when |
| -- the enclosing instance is analyzed. |
| |
| if GNATprove_Mode |
| and then Is_Generic_Actual_Subprogram (Def_Id) |
| then |
| Insert_After (N, New_Body); |
| |
| else |
| if Nkind (Par) = N_Package_Specification |
| and then Decls = Visible_Declarations (Par) |
| and then Present (Private_Declarations (Par)) |
| and then not Is_Empty_List (Private_Declarations (Par)) |
| then |
| Decls := Private_Declarations (Par); |
| end if; |
| |
| Insert_After (Last (Decls), New_Body); |
| |
| -- Preanalyze the expression if not already done above |
| |
| if not Inside_A_Generic then |
| Push_Scope (Def_Id); |
| Install_Formals (Def_Id); |
| Preanalyze_Formal_Expression (Expr, Typ); |
| Check_Limited_Return (Original_Node (N), Expr, Typ); |
| End_Scope; |
| end if; |
| end if; |
| end; |
| end if; |
| |
| -- Check incorrect use of dynamically tagged expression. This doesn't |
| -- fall out automatically when analyzing the generated function body, |
| -- because Check_Dynamically_Tagged_Expression deliberately ignores |
| -- nodes that don't come from source. |
| |
| if Present (Def_Id) |
| and then Nkind (Def_Id) in N_Has_Etype |
| and then Is_Tagged_Type (Etype (Def_Id)) |
| then |
| Check_Dynamically_Tagged_Expression |
| (Expr => Expr, |
| Typ => Etype (Def_Id), |
| Related_Nod => Original_Node (N)); |
| end if; |
| |
| -- We must enforce checks for unreferenced formals in our newly |
| -- generated function, so we propagate the referenced flag from the |
| -- original spec to the new spec as well as setting Comes_From_Source. |
| |
| if Present (Parameter_Specifications (New_Spec)) then |
| declare |
| Form_New_Def : Entity_Id; |
| Form_New_Spec : Entity_Id; |
| Form_Old_Def : Entity_Id; |
| Form_Old_Spec : Entity_Id; |
| |
| begin |
| Form_New_Spec := First (Parameter_Specifications (New_Spec)); |
| Form_Old_Spec := First (Parameter_Specifications (Spec)); |
| |
| while Present (Form_New_Spec) and then Present (Form_Old_Spec) loop |
| Form_New_Def := Defining_Identifier (Form_New_Spec); |
| Form_Old_Def := Defining_Identifier (Form_Old_Spec); |
| |
| Set_Comes_From_Source (Form_New_Def, True); |
| |
| -- Because of the usefulness of unreferenced controlling |
| -- formals we exempt them from unreferenced warnings by marking |
| -- them as always referenced. |
| |
| Set_Referenced (Form_Old_Def, |
| (Is_Formal (Form_Old_Def) |
| and then Is_Controlling_Formal (Form_Old_Def)) |
| or else Referenced (Form_Old_Def)); |
| |
| Next (Form_New_Spec); |
| Next (Form_Old_Spec); |
| end loop; |
| end; |
| end if; |
| end Analyze_Expression_Function; |
| |
| ---------------------------------------- |
| -- Analyze_Extended_Return_Statement -- |
| ---------------------------------------- |
| |
| procedure Analyze_Extended_Return_Statement (N : Node_Id) is |
| begin |
| Check_Compiler_Unit ("extended return statement", N); |
| Analyze_Return_Statement (N); |
| end Analyze_Extended_Return_Statement; |
| |
| ---------------------------- |
| -- Analyze_Function_Call -- |
| ---------------------------- |
| |
| procedure Analyze_Function_Call (N : Node_Id) is |
| Actuals : constant List_Id := Parameter_Associations (N); |
| Func_Nam : constant Node_Id := Name (N); |
| Actual : Node_Id; |
| |
| begin |
| Analyze (Func_Nam); |
| |
| -- A call of the form A.B (X) may be an Ada 2005 call, which is |
| -- rewritten as B (A, X). If the rewriting is successful, the call |
| -- has been analyzed and we just return. |
| |
| if Nkind (Func_Nam) = N_Selected_Component |
| and then Name (N) /= Func_Nam |
| and then Is_Rewrite_Substitution (N) |
| and then Present (Etype (N)) |
| then |
| return; |
| end if; |
| |
| -- If error analyzing name, then set Any_Type as result type and return |
| |
| if Etype (Func_Nam) = Any_Type then |
| Set_Etype (N, Any_Type); |
| return; |
| end if; |
| |
| -- Otherwise analyze the parameters |
| |
| if Present (Actuals) then |
| Actual := First (Actuals); |
| while Present (Actual) loop |
| Analyze (Actual); |
| Check_Parameterless_Call (Actual); |
| Next (Actual); |
| end loop; |
| end if; |
| |
| Analyze_Call (N); |
| end Analyze_Function_Call; |
| |
| ----------------------------- |
| -- Analyze_Function_Return -- |
| ----------------------------- |
| |
| procedure Analyze_Function_Return (N : Node_Id) is |
| Loc : constant Source_Ptr := Sloc (N); |
| Stm_Entity : constant Entity_Id := Return_Statement_Entity (N); |
| Scope_Id : constant Entity_Id := Return_Applies_To (Stm_Entity); |
| |
| R_Type : constant Entity_Id := Etype (Scope_Id); |
| -- Function result subtype |
| |
| procedure Check_Return_Obj_Accessibility (Return_Stmt : Node_Id); |
| -- Apply legality rule of 6.5 (5.9) to the access discriminants of an |
| -- aggregate in a return statement. |
| |
| procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id); |
| -- Check that the return_subtype_indication properly matches the result |
| -- subtype of the function, as required by RM-6.5(5.1/2-5.3/2). |
| |
| ------------------------------------ |
| -- Check_Return_Obj_Accessibility -- |
| ------------------------------------ |
| |
| procedure Check_Return_Obj_Accessibility (Return_Stmt : Node_Id) is |
| Assoc : Node_Id; |
| Agg : Node_Id := Empty; |
| Discr : Entity_Id; |
| Expr : Node_Id; |
| Obj : Node_Id; |
| Process_Exprs : Boolean := False; |
| Return_Obj : Node_Id; |
| |
| begin |
| -- Only perform checks on record types with access discriminants |
| |
| if not Is_Record_Type (R_Type) |
| or else not Has_Discriminants (R_Type) |
| then |
| return; |
| end if; |
| |
| -- We are only interested in return statements |
| |
| if not Nkind_In (Return_Stmt, N_Extended_Return_Statement, |
| N_Simple_Return_Statement) |
| then |
| return; |
| end if; |
| |
| -- Fetch the object from the return statement, in the case of a |
| -- simple return statement the expression is part of the node. |
| |
| if Nkind (Return_Stmt) = N_Extended_Return_Statement then |
| Return_Obj := Last (Return_Object_Declarations (Return_Stmt)); |
| |
| -- We could be looking at something that's been expanded with |
| -- an initialzation procedure which we can safely ignore. |
| |
| if Nkind (Return_Obj) /= N_Object_Declaration then |
| return; |
| end if; |
| else |
| Return_Obj := Return_Stmt; |
| end if; |
| |
| -- We may need to check an aggregate or a subtype indication |
| -- depending on how the discriminants were specified and whether |
| -- we are looking at an extended return statement. |
| |
| if Nkind (Return_Obj) = N_Object_Declaration |
| and then Nkind (Object_Definition (Return_Obj)) |
| = N_Subtype_Indication |
| then |
| Assoc := First (Constraints |
| (Constraint (Object_Definition (Return_Obj)))); |
| else |
| -- Qualified expressions may be nested |
| |
| Agg := Original_Node (Expression (Return_Obj)); |
| while Nkind (Agg) = N_Qualified_Expression loop |
| Agg := Original_Node (Expression (Agg)); |
| end loop; |
| |
| -- If we are looking at an aggregate instead of a function call we |
| -- can continue checking accessibility for the supplied |
| -- discriminant associations. |
| |
| if Nkind (Agg) = N_Aggregate then |
| if Present (Expressions (Agg)) then |
| Assoc := First (Expressions (Agg)); |
| Process_Exprs := True; |
| else |
| Assoc := First (Component_Associations (Agg)); |
| end if; |
| |
| -- Otherwise the expression is not of interest ??? |
| |
| else |
| return; |
| end if; |
| end if; |
| |
| -- Move through the discriminants checking the accessibility level |
| -- of each co-extension's associated expression. |
| |
| Discr := First_Discriminant (R_Type); |
| while Present (Discr) loop |
| if Ekind (Etype (Discr)) = E_Anonymous_Access_Type then |
| |
| if Nkind (Assoc) = N_Attribute_Reference then |
| Expr := Assoc; |
| elsif Nkind_In (Assoc, N_Component_Association, |
| N_Discriminant_Association) |
| then |
| Expr := Expression (Assoc); |
| end if; |
| |
| -- This anonymous access discriminant has an associated |
| -- expression which needs checking. |
| |
| if Nkind (Expr) = N_Attribute_Reference |
| and then Attribute_Name (Expr) /= Name_Unrestricted_Access |
| then |
| -- Obtain the object to perform static checks on by moving |
| -- up the prefixes in the expression taking into account |
| -- named access types. |
| |
| Obj := Prefix (Expr); |
| while Nkind_In (Obj, N_Indexed_Component, |
| N_Selected_Component) |
| loop |
| -- When we encounter a named access type then we can |
| -- ignore accessibility checks on the dereference. |
| |
| if Ekind (Etype (Prefix (Obj))) |
| in E_Access_Type .. |
| E_Access_Protected_Subprogram_Type |
| then |
| if Nkind (Obj) = N_Selected_Component then |
| Obj := Selector_Name (Obj); |
| end if; |
| exit; |
| end if; |
| |
| -- Skip over the explicit dereference |
| |
| if Nkind (Prefix (Obj)) = N_Explicit_Dereference then |
| Obj := Prefix (Prefix (Obj)); |
| |
| -- Otherwise move up to the next prefix |
| |
| else |
| Obj := Prefix (Obj); |
| end if; |
| end loop; |
| |
| -- Do not check aliased formals or function calls. A |
| -- run-time check may still be needed ??? |
| |
| if Is_Entity_Name (Obj) |
| and then Comes_From_Source (Obj) |
| then |
| -- Explicitly aliased formals are allowed |
| |
| if Is_Formal (Entity (Obj)) |
| and then Is_Aliased (Entity (Obj)) |
| then |
| null; |
| |
| elsif Object_Access_Level (Obj) > |
| Scope_Depth (Scope (Scope_Id)) |
| then |
| Error_Msg_N |
| ("access discriminant in return aggregate would " |
| & "be a dangling reference", Obj); |
| end if; |
| end if; |
| end if; |
| end if; |
| |
| Next_Discriminant (Discr); |
| |
| if not Is_List_Member (Assoc) then |
| Assoc := Empty; |
| else |
| Nlists.Next (Assoc); |
| end if; |
| |
| -- After aggregate expressions, examine component associations if |
| -- present. |
| |
| if No (Assoc) then |
| if Present (Agg) |
| and then Process_Exprs |
| and then Present (Component_Associations (Agg)) |
| then |
| Assoc := First (Component_Associations (Agg)); |
| Process_Exprs := False; |
| else |
| exit; |
| end if; |
| end if; |
| end loop; |
| end Check_Return_Obj_Accessibility; |
| |
| ------------------------------------- |
| -- Check_Return_Subtype_Indication -- |
| ------------------------------------- |
| |
| procedure Check_Return_Subtype_Indication (Obj_Decl : Node_Id) is |
| Return_Obj : constant Node_Id := Defining_Identifier (Obj_Decl); |
| |
| R_Stm_Type : constant Entity_Id := Etype (Return_Obj); |
| -- Subtype given in the extended return statement (must match R_Type) |
| |
| Subtype_Ind : constant Node_Id := |
| Object_Definition (Original_Node (Obj_Decl)); |
| |
| procedure Error_No_Match (N : Node_Id); |
| -- Output error messages for case where types do not statically |
| -- match. N is the location for the messages. |
| |
| -------------------- |
| -- Error_No_Match -- |
| -------------------- |
| |
| procedure Error_No_Match (N : Node_Id) is |
| begin |
| Error_Msg_N |
| ("subtype must statically match function result subtype", N); |
| |
| if not Predicates_Match (R_Stm_Type, R_Type) then |
| Error_Msg_Node_2 := R_Type; |
| Error_Msg_NE |
| ("\predicate of& does not match predicate of&", |
| N, R_Stm_Type); |
| end if; |
| end Error_No_Match; |
| |
| -- Start of processing for Check_Return_Subtype_Indication |
| |
| begin |
| -- First, avoid cascaded errors |
| |
| if Error_Posted (Obj_Decl) or else Error_Posted (Subtype_Ind) then |
| return; |
| end if; |
| |
| -- "return access T" case; check that the return statement also has |
| -- "access T", and that the subtypes statically match: |
| -- if this is an access to subprogram the signatures must match. |
| |
| if Is_Anonymous_Access_Type (R_Type) then |
| if Is_Anonymous_Access_Type (R_Stm_Type) then |
| if Ekind (Designated_Type (R_Stm_Type)) /= E_Subprogram_Type |
| then |
| if Base_Type (Designated_Type (R_Stm_Type)) /= |
| Base_Type (Designated_Type (R_Type)) |
| or else not Subtypes_Statically_Match (R_Stm_Type, R_Type) |
| then |
| Error_No_Match (Subtype_Mark (Subtype_Ind)); |
| end if; |
| |
| else |
| -- For two anonymous access to subprogram types, the types |
| -- themselves must be type conformant. |
| |
| if not Conforming_Types |
| (R_Stm_Type, R_Type, Fully_Conformant) |
| then |
| Error_No_Match (Subtype_Ind); |
| end if; |
| end if; |
| |
| else |
| Error_Msg_N ("must use anonymous access type", Subtype_Ind); |
| end if; |
| |
| -- If the return object is of an anonymous access type, then report |
| -- an error if the function's result type is not also anonymous. |
| |
| elsif Is_Anonymous_Access_Type (R_Stm_Type) then |
| pragma Assert (not Is_Anonymous_Access_Type (R_Type)); |
| Error_Msg_N |
| ("anonymous access not allowed for function with named access " |
| & "result", Subtype_Ind); |
| |
| -- Subtype indication case: check that the return object's type is |
| -- covered by the result type, and that the subtypes statically match |
| -- when the result subtype is constrained. Also handle record types |
| -- with unknown discriminants for which we have built the underlying |
| -- record view. Coverage is needed to allow specific-type return |
| -- objects when the result type is class-wide (see AI05-32). |
| |
| elsif Covers (Base_Type (R_Type), Base_Type (R_Stm_Type)) |
| or else (Is_Underlying_Record_View (Base_Type (R_Stm_Type)) |
| and then |
| Covers |
| (Base_Type (R_Type), |
| Underlying_Record_View (Base_Type (R_Stm_Type)))) |
| then |
| -- A null exclusion may be present on the return type, on the |
| -- function specification, on the object declaration or on the |
| -- subtype itself. |
| |
| if Is_Access_Type (R_Type) |
| and then |
| (Can_Never_Be_Null (R_Type) |
| or else Null_Exclusion_Present (Parent (Scope_Id))) /= |
| Can_Never_Be_Null (R_Stm_Type) |
| then |
| Error_No_Match (Subtype_Ind); |
| end if; |
| |
| -- AI05-103: for elementary types, subtypes must statically match |
| |
| if Is_Constrained (R_Type) or else Is_Access_Type (R_Type) then |
| if not Subtypes_Statically_Match (R_Stm_Type, R_Type) then |
| Error_No_Match (Subtype_Ind); |
| end if; |
| end if; |
| |
| -- All remaining cases are illegal |
| |
| -- Note: previous versions of this subprogram allowed the return |
| -- value to be the ancestor of the return type if the return type |
| -- was a null extension. This was plainly incorrect. |
| |
| else |
| Error_Msg_N |
| ("wrong type for return_subtype_indication", Subtype_Ind); |
| end if; |
| end Check_Return_Subtype_Indication; |
| |
| --------------------- |
| -- Local Variables -- |
| --------------------- |
| |
| Expr : Node_Id; |
| Obj_Decl : Node_Id := Empty; |
| |
| -- Start of processing for Analyze_Function_Return |
| |
| begin |
| Set_Return_Present (Scope_Id); |
| |
| if Nkind (N) = N_Simple_Return_Statement then |
| Expr := Expression (N); |
| |
| -- Guard against a malformed expression. The parser may have tried to |
| -- recover but the node is not analyzable. |
| |
| if Nkind (Expr) = N_Error then |
| Set_Etype (Expr, Any_Type); |
| Expander_Mode_Save_And_Set (False); |
| return; |
| |
| else |
| -- The resolution of a controlled [extension] aggregate associated |
| -- with a return statement creates a temporary which needs to be |
| -- finalized on function exit. Wrap the return statement inside a |
| -- block so that the finalization machinery can detect this case. |
| -- This early expansion is done only when the return statement is |
| -- not part of a handled sequence of statements. |
| |
| if Nkind_In (Expr, N_Aggregate, |
| N_Extension_Aggregate) |
| and then Needs_Finalization (R_Type) |
| and then Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements |
| then |
| Rewrite (N, |
| Make_Block_Statement (Loc, |
| Handled_Statement_Sequence => |
| Make_Handled_Sequence_Of_Statements (Loc, |
| Statements => New_List (Relocate_Node (N))))); |
| |
| Analyze (N); |
| return; |
| end if; |
| |
| Analyze (Expr); |
| |
| -- Ada 2005 (AI-251): If the type of the returned object is |
| -- an access to an interface type then we add an implicit type |
| -- conversion to force the displacement of the "this" pointer to |
| -- reference the secondary dispatch table. We cannot delay the |
| -- generation of this implicit conversion until the expansion |
| -- because in this case the type resolution changes the decoration |
| -- of the expression node to match R_Type; by contrast, if the |
| -- returned object is a class-wide interface type then it is too |
| -- early to generate here the implicit conversion since the return |
| -- statement may be rewritten by the expander into an extended |
| -- return statement whose expansion takes care of adding the |
| -- implicit type conversion to displace the pointer to the object. |
| |
| if Expander_Active |
| and then Serious_Errors_Detected = 0 |
| and then Is_Access_Type (R_Type) |
| and then not Nkind_In (Expr, N_Null, N_Raise_Expression) |
| and then Is_Interface (Designated_Type (R_Type)) |
| and then Is_Progenitor (Designated_Type (R_Type), |
| Designated_Type (Etype (Expr))) |
| then |
| Rewrite (Expr, Convert_To (R_Type, Relocate_Node (Expr))); |
| Analyze (Expr); |
| end if; |
| |
| Resolve (Expr, R_Type); |
| Check_Limited_Return (N, Expr, R_Type); |
| |
| Check_Return_Obj_Accessibility (N); |
| end if; |
| |
| -- RETURN only allowed in SPARK as the last statement in function |
| |
| if Nkind (Parent (N)) /= N_Handled_Sequence_Of_Statements |
| and then |
| (Nkind (Parent (Parent (N))) /= N_Subprogram_Body |
| or else Present (Next (N))) |
| then |
| Check_SPARK_05_Restriction |
| ("RETURN should be the last statement in function", N); |
| end if; |
| |
| else |
| Check_SPARK_05_Restriction ("extended RETURN is not allowed", N); |
| Obj_Decl := Last (Return_Object_Declarations (N)); |
| |
| -- Analyze parts specific to extended_return_statement: |
| |
| declare |
| Has_Aliased : constant Boolean := Aliased_Present (Obj_Decl); |
| HSS : constant Node_Id := Handled_Statement_Sequence (N); |
| |
| begin |
| Expr := Expression (Obj_Decl); |
| |
| -- Note: The check for OK_For_Limited_Init will happen in |
| -- Analyze_Object_Declaration; we treat it as a normal |
| -- object declaration. |
| |
| Set_Is_Return_Object (Defining_Identifier (Obj_Decl)); |
| Analyze (Obj_Decl); |
| |
| Check_Return_Subtype_Indication (Obj_Decl); |
| |
| if Present (HSS) then |
| Analyze (HSS); |
| |
| if Present (Exception_Handlers (HSS)) then |
| |
| -- ???Has_Nested_Block_With_Handler needs to be set. |
| -- Probably by creating an actual N_Block_Statement. |
| -- Probably in Expand. |
| |
| null; |
| end if; |
| end if; |
| |
| -- Mark the return object as referenced, since the return is an |
| -- implicit reference of the object. |
| |
| Set_Referenced (Defining_Identifier (Obj_Decl)); |
| |
| Check_References (Stm_Entity); |
| |
| Check_Return_Obj_Accessibility (N); |
| |
| -- Check RM 6.5 (5.9/3) |
| |
| if Has_Aliased then |
| if Ada_Version < Ada_2012 then |
| |
| -- Shouldn't this test Warn_On_Ada_2012_Compatibility ??? |
| -- Can it really happen (extended return???) |
| |
| Error_Msg_N |
| ("aliased only allowed for limited return objects " |
| & "in Ada 2012??", N); |
| |
| elsif not Is_Limited_View (R_Type) then |
| Error_Msg_N |
| ("aliased only allowed for limited return objects", N); |
| end if; |
| end if; |
| end; |
| end if; |
| |
| -- Case of Expr present |
| |
| if Present (Expr) then |
| |
| -- Defend against previous errors |
| |
| if Nkind (Expr) = N_Empty |
| or else No (Etype (Expr)) |
| then |
| return; |
| end if; |
| |
| -- Apply constraint check. Note that this is done before the implicit |
| -- conversion of the expression done for anonymous access types to |
| -- ensure correct generation of the null-excluding check associated |
| -- with null-excluding expressions found in return statements. We |
| -- don't need a check if the subtype of the return object is the |
| -- same as the result subtype of the function. |
| |
| if Nkind (N) /= N_Extended_Return_Statement |
| or else Nkind (Obj_Decl) /= N_Object_Declaration |
| or else Nkind (Object_Definition (Obj_Decl)) not in N_Has_Entity |
| or else Entity (Object_Definition (Obj_Decl)) /= R_Type |
| then |
| Apply_Constraint_Check (Expr, R_Type); |
| end if; |
| |
| -- The return value is converted to the return type of the function, |
| -- which implies a predicate check if the return type is predicated. |
| -- We do not apply the check to a case expression because it will |
| -- be expanded into a series of return statements, each of which |
| -- will receive a predicate check. |
| |
| if Nkind (Expr) /= N_Case_Expression then |
| Apply_Predicate_Check (Expr, R_Type); |
| end if; |
| |
| -- Ada 2005 (AI-318-02): When the result type is an anonymous access |
| -- type, apply an implicit conversion of the expression to that type |
| -- to force appropriate static and run-time accessibility checks. |
| |
| if Ada_Version >= Ada_2005 |
| and then Ekind (R_Type) = E_Anonymous_Access_Type |
| then |
| Rewrite (Expr, Convert_To (R_Type, Relocate_Node (Expr))); |
| Analyze_And_Resolve (Expr, R_Type); |
| |
| -- If this is a local anonymous access to subprogram, the |
| -- accessibility check can be applied statically. The return is |
| -- illegal if the access type of the return expression is declared |
| -- inside of the subprogram (except if it is the subtype indication |
| -- of an extended return statement). |
| |
| elsif Ekind (R_Type) = E_Anonymous_Access_Subprogram_Type then |
| if not Comes_From_Source (Current_Scope) |
| or else Ekind (Current_Scope) = E_Return_Statement |
| then |
| null; |
| |
| elsif |
| Scope_Depth (Scope (Etype (Expr))) >= Scope_Depth (Scope_Id) |
| then |
| Error_Msg_N ("cannot return local access to subprogram", N); |
| end if; |
| |
| -- The expression cannot be of a formal incomplete type |
| |
| elsif Ekind (Etype (Expr)) = E_Incomplete_Type |
| and then Is_Generic_Type (Etype (Expr)) |
| then |
| Error_Msg_N |
| ("cannot return expression of a formal incomplete type", N); |
| end if; |
| |
| -- If the result type is class-wide, then check that the return |
| -- expression's type is not declared at a deeper level than the |
| -- function (RM05-6.5(5.6/2)). |
| |
| if Ada_Version >= Ada_2005 |
| and then Is_Class_Wide_Type (R_Type) |
| then |
| if Type_Access_Level (Etype (Expr)) > |
| Subprogram_Access_Level (Scope_Id) |
| then |
| Error_Msg_N |
| ("level of return expression type is deeper than " |
| & "class-wide function!", Expr); |
| end if; |
| end if; |
| |
| -- Check incorrect use of dynamically tagged expression |
| |
| if Is_Tagged_Type (R_Type) then |
| Check_Dynamically_Tagged_Expression |
| (Expr => Expr, |
| Typ => R_Type, |
| Related_Nod => N); |
| end if; |
| |
| -- ??? A real run-time accessibility check is needed in cases |
| -- involving dereferences of access parameters. For now we just |
| -- check the static cases. |
| |
| if (Ada_Version < Ada_2005 or else Debug_Flag_Dot_L) |
| and then Is_Limited_View (Etype (Scope_Id)) |
| and then Object_Access_Level (Expr) > |
| Subprogram_Access_Level (Scope_Id) |
| then |
| -- Suppress the message in a generic, where the rewriting |
| -- is irrelevant. |
| |
| if Inside_A_Generic then |
| null; |
| |
| else |
| Rewrite (N, |
| Make_Raise_Program_Error (Loc, |
| Reason => PE_Accessibility_Check_Failed)); |
| Analyze (N); |
| |
| Error_Msg_Warn := SPARK_Mode /= On; |
| Error_Msg_N ("cannot return a local value by reference<<", N); |
| Error_Msg_NE ("\& [<<", N, Standard_Program_Error); |
| end if; |
| end if; |
| |
| if Known_Null (Expr) |
| and then Nkind (Parent (Scope_Id)) = N_Function_Specification |
| and then Null_Exclusion_Present (Parent (Scope_Id)) |
| then |
| Apply_Compile_Time_Constraint_Error |
| (N => Expr, |
| Msg => "(Ada 2005) null not allowed for " |
| & "null-excluding return??", |
| Reason => CE_Null_Not_Allowed); |
| end if; |
| |
| -- RM 6.5 (5.4/3): accessibility checks also apply if the return object |
| -- has no initializing expression. |
| |
| elsif Ada_Version > Ada_2005 and then Is_Class_Wide_Type (R_Type) then |
| if Type_Access_Level (Etype (Defining_Identifier (Obj_Decl))) > |
| Subprogram_Access_Level (Scope_Id) |
| then |
| Error_Msg_N |
| ("level of return expression type is deeper than " |
| & "class-wide function!", Obj_Decl); |
| end if; |
| end if; |
| end Analyze_Function_Return; |
| |
| ------------------------------------- |
| -- Analyze_Generic_Subprogram_Body -- |
| ------------------------------------- |
| |
| procedure Analyze_Generic_Subprogram_Body |
| (N : Node_Id; |
| Gen_Id : Entity_Id) |
| is |
| Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Id); |
| Kind : constant Entity_Kind := Ekind (Gen_Id); |
| Body_Id : Entity_Id; |
| New_N : Node_Id; |
| Spec : Node_Id; |
| |
| begin |
| -- Copy body and disable expansion while analyzing the generic For a |
| -- stub, do not copy the stub (which would load the proper body), this |
| -- will be done when the proper body is analyzed. |
| |
| if Nkind (N) /= N_Subprogram_Body_Stub then |
| New_N := Copy_Generic_Node (N, Empty, Instantiating => False); |
| Rewrite (N, New_N); |
| |
| -- Once the contents of the generic copy and the template are |
| -- swapped, do the same for their respective aspect specifications. |
| |
| Exchange_Aspects (N, New_N); |
| |
| -- Collect all contract-related source pragmas found within the |
| -- template and attach them to the contract of the subprogram body. |
| -- This contract is used in the capture of global references within |
| -- annotations. |
| |
| Create_Generic_Contract (N); |
| |
| Start_Generic; |
| end if; |
| |
| Spec := Specification (N); |
| |
| -- Within the body of the generic, the subprogram is callable, and |
| -- behaves like the corresponding non-generic unit. |
| |
| Body_Id := Defining_Entity (Spec); |
| |
| if Kind = E_Generic_Procedure |
| and then Nkind (Spec) /= N_Procedure_Specification |
| then |
| Error_Msg_N ("invalid body for generic procedure ", Body_Id); |
| return; |
| |
| elsif Kind = E_Generic_Function |
| and then Nkind (Spec) /= N_Function_Specification |
| then |
| Error_Msg_N ("invalid body for generic function ", Body_Id); |
| return; |
| end if; |
| |
| Set_Corresponding_Body (Gen_Decl, Body_Id); |
| |
| if Has_Completion (Gen_Id) |
| and then Nkind (Parent (N)) /= N_Subunit |
| then |
| Error_Msg_N ("duplicate generic body", N); |
| return; |
| else |
| Set_Has_Completion (Gen_Id); |
| end if; |
| |
| if Nkind (N) = N_Subprogram_Body_Stub then |
| Set_Ekind (Defining_Entity (Specification (N)), Kind); |
| else |
| Set_Corresponding_Spec (N, Gen_Id); |
| end if; |
| |
| if Nkind (Parent (N)) = N_Compilation_Unit then |
| Set_Cunit_Entity (Current_Sem_Unit, Defining_Entity (N)); |
| end if; |
| |
| -- Make generic parameters immediately visible in the body. They are |
| -- needed to process the formals declarations. Then make the formals |
| -- visible in a separate step. |
| |
| Push_Scope (Gen_Id); |
| |
| declare |
| E : Entity_Id; |
| First_Ent : Entity_Id; |
| |
| begin |
| First_Ent := First_Entity (Gen_Id); |
| |
| E := First_Ent; |
| while Present (E) and then not Is_Formal (E) loop |
| Install_Entity (E); |
| Next_Entity (E); |
| end loop; |
| |
| Set_Use (Generic_Formal_Declarations (Gen_Decl)); |
| |
| -- Now generic formals are visible, and the specification can be |
| -- analyzed, for subsequent conformance check. |
| |
| Body_Id := Analyze_Subprogram_Specification (Spec); |
| |
| -- Make formal parameters visible |
| |
| if Present (E) then |
| |
| -- E is the first formal parameter, we loop through the formals |
| -- installing them so that they will be visible. |
| |
| Set_First_Entity (Gen_Id, E); |
| while Present (E) loop |
| Install_Entity (E); |
| Next_Formal (E); |
| end loop; |
| end if; |
| |
| -- Visible generic entity is callable within its own body |
| |
| Set_Ekind (Gen_Id, Ekind (Body_Id)); |
| Set_Ekind (Body_Id, E_Subprogram_Body); |
| Set_Convention (Body_Id, Convention (Gen_Id)); |
| Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Gen_Id)); |
| Set_Scope (Body_Id, Scope (Gen_Id)); |
| |
| Check_Fully_Conformant (Body_Id, Gen_Id, Body_Id); |
| |
| if Nkind (N) = N_Subprogram_Body_Stub then |
| |
| -- No body to analyze, so restore state of generic unit |
| |
| Set_Ekind (Gen_Id, Kind); |
| Set_Ekind (Body_Id, Kind); |
| |
| if Present (First_Ent) then |
| Set_First_Entity (Gen_Id, First_Ent); |
| end if; |
| |
| End_Scope; |
| return; |
| end if; |
| |
| -- If this is a compilation unit, it must be made visible explicitly, |
| -- because the compilation of the declaration, unlike other library |
| -- unit declarations, does not. If it is not a unit, the following |
| -- is redundant but harmless. |
| |
| Set_Is_Immediately_Visible (Gen_Id); |
| Reference_Body_Formals (Gen_Id, Body_Id); |
| |
| if Is_Child_Unit (Gen_Id) then |
| Generate_Reference (Gen_Id, Scope (Gen_Id), 'k', False); |
| end if; |
| |
| Set_Actual_Subtypes (N, Current_Scope); |
| |
| Set_SPARK_Pragma (Body_Id, SPARK_Mode_Pragma); |
| Set_SPARK_Pragma_Inherited (Body_Id); |
| |
| -- Analyze any aspect specifications that appear on the generic |
| -- subprogram body. |
| |
| if Has_Aspects (N) then |
| Analyze_Aspects_On_Subprogram_Body_Or_Stub (N); |
| end if; |
| |
| Analyze_Declarations (Declarations (N)); |
| Check_Completion; |
| |
| -- Process the contract of the subprogram body after all declarations |
| -- have been analyzed. This ensures that any contract-related pragmas |
| -- are available through the N_Contract node of the body. |
| |
| Analyze_Entry_Or_Subprogram_Body_Contract (Body_Id); |
| |
| Analyze (Handled_Statement_Sequence (N)); |
| Save_Global_References (Original_Node (N)); |
| |
| -- Prior to exiting the scope, include generic formals again (if any |
| -- are present) in the set of local entities. |
| |
| if Present (First_Ent) then |
| Set_First_Entity (Gen_Id, First_Ent); |
| end if; |
| |
| Check_References (Gen_Id); |
| end; |
| |
| Process_End_Label (Handled_Statement_Sequence (N), 't', Current_Scope); |
| Update_Use_Clause_Chain; |
| Validate_Categorization_Dependency (N, Gen_Id); |
| End_Scope; |
| Check_Subprogram_Order (N); |
| |
| -- Outside of its body, unit is generic again |
| |
| Set_Ekind (Gen_Id, Kind); |
| Generate_Reference (Gen_Id, Body_Id, 'b', Set_Ref => False); |
| |
| if Style_Check then |
| Style.Check_Identifier (Body_Id, Gen_Id); |
| end if; |
| |
| End_Generic; |
| end Analyze_Generic_Subprogram_Body; |
| |
| ---------------------------- |
| -- Analyze_Null_Procedure -- |
| ---------------------------- |
| |
| -- WARNING: This routine manages Ghost regions. Return statements must be |
| -- replaced by gotos that jump to the end of the routine and restore the |
| -- Ghost mode. |
| |
| procedure Analyze_Null_Procedure |
| (N : Node_Id; |
| Is_Completion : out Boolean) |
| is |
| Loc : constant Source_Ptr := Sloc (N); |
| Spec : constant Node_Id := Specification (N); |
| |
| Saved_GM : constant Ghost_Mode_Type := Ghost_Mode; |
| Saved_IGR : constant Node_Id := Ignored_Ghost_Region; |
| Saved_ISMP : constant Boolean := |
| Ignore_SPARK_Mode_Pragmas_In_Instance; |
| -- Save the Ghost and SPARK mode-related data to restore on exit |
| |
| Designator : Entity_Id; |
| Form : Node_Id; |
| Null_Body : Node_Id := Empty; |
| Null_Stmt : Node_Id := Null_Statement (Spec); |
| Prev : Entity_Id; |
| |
| begin |
| Prev := Current_Entity_In_Scope (Defining_Entity (Spec)); |
| |
| -- A null procedure is Ghost when it is stand-alone and is subject to |
| -- pragma Ghost, or when the corresponding spec is Ghost. Set the mode |
| -- now, to ensure that any nodes generated during analysis and expansion |
| -- are properly marked as Ghost. |
| |
| if Present (Prev) then |
| Mark_And_Set_Ghost_Body (N, Prev); |
| end if; |
| |
| -- Capture the profile of the null procedure before analysis, for |
| -- expansion at the freeze point and at each point of call. The body is |
| -- used if the procedure has preconditions, or if it is a completion. In |
| -- the first case the body is analyzed at the freeze point, in the other |
| -- it replaces the null procedure declaration. |
| |
| -- For a null procedure that comes from source, a NULL statement is |
| -- provided by the parser, which carries the source location of the |
| -- NULL keyword, and has Comes_From_Source set. For a null procedure |
| -- from expansion, create one now. |
| |
| if No (Null_Stmt) then |
| Null_Stmt := Make_Null_Statement (Loc); |
| end if; |
| |
| Null_Body := |
| Make_Subprogram_Body (Loc, |
| Specification => New_Copy_Tree (Spec), |
| Declarations => New_List, |
| Handled_Statement_Sequence => |
| Make_Handled_Sequence_Of_Statements (Loc, |
| Statements => New_List (Null_Stmt))); |
| |
| -- Create new entities for body and formals |
| |
| Set_Defining_Unit_Name (Specification (Null_Body), |
| Make_Defining_Identifier |
| (Sloc (Defining_Entity (N)), |
| Chars (Defining_Entity (N)))); |
| |
| Form := First (Parameter_Specifications (Specification (Null_Body))); |
| while Present (Form) loop |
| Set_Defining_Identifier (Form, |
| Make_Defining_Identifier |
| (Sloc (Defining_Identifier (Form)), |
| Chars (Defining_Identifier (Form)))); |
| Next (Form); |
| end loop; |
| |
| -- Determine whether the null procedure may be a completion of a generic |
| -- suprogram, in which case we use the new null body as the completion |
| -- and set minimal semantic information on the original declaration, |
| -- which is rewritten as a null statement. |
| |
| if Present (Prev) and then Is_Generic_Subprogram (Prev) then |
| Insert_Before (N, Null_Body); |
| Set_Ekind (Defining_Entity (N), Ekind (Prev)); |
| |
| Rewrite (N, Make_Null_Statement (Loc)); |
| Analyze_Generic_Subprogram_Body (Null_Body, Prev); |
| Is_Completion := True; |
| |
| goto Leave; |
| |
| else |
| -- Resolve the types of the formals now, because the freeze point may |
| -- appear in a different context, e.g. an instantiation. |
| |
| Form := First (Parameter_Specifications (Specification (Null_Body))); |
| while Present (Form) loop |
| if Nkind (Parameter_Type (Form)) /= N_Access_Definition then |
| Find_Type (Parameter_Type (Form)); |
| |
| elsif No (Access_To_Subprogram_Definition |
| (Parameter_Type (Form))) |
| then |
| Find_Type (Subtype_Mark (Parameter_Type (Form))); |
| |
| -- The case of a null procedure with a formal that is an |
| -- access-to-subprogram type, and that is used as an actual |
| -- in an instantiation is left to the enthusiastic reader. |
| |
| else |
| null; |
| end if; |
| |
| Next (Form); |
| end loop; |
| end if; |
| |
| -- If there are previous overloadable entities with the same name, check |
| -- whether any of them is completed by the null procedure. |
| |
| if Present (Prev) and then Is_Overloadable (Prev) then |
| Designator := Analyze_Subprogram_Specification (Spec); |
| Prev := Find_Corresponding_Spec (N); |
| end if; |
| |
| if No (Prev) or else not Comes_From_Source (Prev) then |
| Designator := Analyze_Subprogram_Specification (Spec); |
| Set_Has_Completion (Designator); |
| |
| -- Signal to caller that this is a procedure declaration |
| |
| Is_Completion := False; |
| |
| -- Null procedures are always inlined, but generic formal subprograms |
| -- which appear as such in the internal instance of formal packages, |
| -- need no completion and are not marked Inline. |
| |
| if Expander_Active |
| and then Nkind (N) /= N_Formal_Concrete_Subprogram_Declaration |
| then |
| Set_Corresponding_Body (N, Defining_Entity (Null_Body)); |
| Set_Body_To_Inline (N, Null_Body); |
| Set_Is_Inlined (Designator); |
| end if; |
| |
| else |
| -- The null procedure is a completion. We unconditionally rewrite |
| -- this as a null body (even if expansion is not active), because |
| -- there are various error checks that are applied on this body |
| -- when it is analyzed (e.g. correct aspect placement). |
| |
| if Has_Completion (Prev) then |
| Error_Msg_Sloc := Sloc (Prev); |
| Error_Msg_NE ("duplicate body for & declared#", N, Prev); |
| end if; |
| |
| Check_Previous_Null_Procedure (N, Prev); |
| |
| Is_Completion := True; |
| Rewrite (N, Null_Body); |
| Analyze (N); |
| end if; |
| |
| <<Leave>> |
| Ignore_SPARK_Mode_Pragmas_In_Instance := Saved_ISMP; |
| Restore_Ghost_Region (Saved_GM, Saved_IGR); |
| end Analyze_Null_Procedure; |
| |
| ----------------------------- |
| -- Analyze_Operator_Symbol -- |
| ----------------------------- |
| |
| -- An operator symbol such as "+" or "and" may appear in context where the |
| -- literal denotes an entity name, such as "+"(x, y) or in context when it |
| -- is just a string, as in (conjunction = "or"). In these cases the parser |
| -- generates this node, and the semantics does the disambiguation. Other |
| -- such case are actuals in an instantiation, the generic unit in an |
| -- instantiation, and pragma arguments. |
| |
| procedure Analyze_Operator_Symbol (N : Node_Id) is |
| Par : constant Node_Id := Parent (N); |
| |
| begin |
| if (Nkind (Par) = N_Function_Call and then N = Name (Par)) |
| or else Nkind (Par) = N_Function_Instantiation |
| or else (Nkind (Par) = N_Indexed_Component and then N = Prefix (Par)) |
| or else (Nkind (Par) = N_Pragma_Argument_Association |
| and then not Is_Pragma_String_Literal (Par)) |
| or else Nkind (Par) = N_Subprogram_Renaming_Declaration |
| or else (Nkind (Par) = N_Attribute_Reference |
| and then Attribute_Name (Par) /= Name_Value) |
| then |
| Find_Direct_Name (N); |
| |
| else |
| Change_Operator_Symbol_To_String_Literal (N); |
| Analyze (N); |
| end if; |
| end Analyze_Operator_Symbol; |
| |
| ----------------------------------- |
| -- Analyze_Parameter_Association -- |
| ----------------------------------- |
| |
| procedure Analyze_Parameter_Association (N : Node_Id) is |
| begin |
| Analyze (Explicit_Actual_Parameter (N)); |
| end Analyze_Parameter_Association; |
| |
| ---------------------------- |
| -- Analyze_Procedure_Call -- |
| ---------------------------- |
| |
| -- WARNING: This routine manages Ghost regions. Return statements must be |
| -- replaced by gotos that jump to the end of the routine and restore the |
| -- Ghost mode. |
| |
| procedure Analyze_Procedure_Call (N : Node_Id) is |
| procedure Analyze_Call_And_Resolve; |
| -- Do Analyze and Resolve calls for procedure call. At the end, check |
| -- for illegal order dependence. |
| -- ??? where is the check for illegal order dependencies? |
| |
| ------------------------------ |
| -- Analyze_Call_And_Resolve -- |
| ------------------------------ |
| |
| procedure Analyze_Call_And_Resolve is |
| begin |
| if Nkind (N) = N_Procedure_Call_Statement then |
| Analyze_Call (N); |
| Resolve (N, Standard_Void_Type); |
| else |
| Analyze (N); |
| end if; |
| end Analyze_Call_And_Resolve; |
| |
| -- Local variables |
| |
| Actuals : constant List_Id := Parameter_Associations (N); |
| Loc : constant Source_Ptr := Sloc (N); |
| P : constant Node_Id := Name (N); |
| |
| Saved_GM : constant Ghost_Mode_Type := Ghost_Mode; |
| Saved_IGR : constant Node_Id := Ignored_Ghost_Region; |
| -- Save the Ghost-related attributes to restore on exit |
| |
| Actual : Node_Id; |
| New_N : Node_Id; |
| |
| -- Start of processing for Analyze_Procedure_Call |
| |
| begin |
| -- The syntactic construct: PREFIX ACTUAL_PARAMETER_PART can denote |
| -- a procedure call or an entry call. The prefix may denote an access |
| -- to subprogram type, in which case an implicit dereference applies. |
| -- If the prefix is an indexed component (without implicit dereference) |
| -- then the construct denotes a call to a member of an entire family. |
| -- If the prefix is a simple name, it may still denote a call to a |
| -- parameterless member of an entry family. Resolution of these various |
| -- interpretations is delicate. |
| |
| -- Do not analyze machine code statements to avoid rejecting them in |
| -- CodePeer mode. |
| |
| if CodePeer_Mode and then Nkind (P) = N_Qualified_Expression then |
| Set_Etype (P, Standard_Void_Type); |
| else |
| Analyze (P); |
| end if; |
| |
| -- If this is a call of the form Obj.Op, the call may have been analyzed |
| -- and possibly rewritten into a block, in which case we are done. |
| |
| if Analyzed (N) then |
| return; |
| |
| -- If there is an error analyzing the name (which may have been |
| -- rewritten if the original call was in prefix notation) then error |
| -- has been emitted already, mark node and return. |
| |
| elsif Error_Posted (N) or else Etype (Name (N)) = Any_Type then |
| Set_Etype (N, Any_Type); |
| return; |
| end if; |
| |
| -- A procedure call is Ghost when its name denotes a Ghost procedure. |
| -- Set the mode now to ensure that any nodes generated during analysis |
| -- and expansion are properly marked as Ghost. |
| |
| Mark_And_Set_Ghost_Procedure_Call (N); |
| |
| -- Otherwise analyze the parameters |
| |
| if Present (Actuals) then |
| Actual := First (Actuals); |
| |
| while Present (Actual) loop |
| Analyze (Actual); |
| Check_Parameterless_Call (Actual); |
| Next (Actual); |
| end loop; |
| end if; |
| |
| -- Special processing for Elab_Spec, Elab_Body and Elab_Subp_Body calls |
| |
| if Nkind (P) = N_Attribute_Reference |
| and then Nam_In (Attribute_Name (P), Name_Elab_Spec, |
| Name_Elab_Body, |
| Name_Elab_Subp_Body) |
| then |
| if Present (Actuals) then |
| Error_Msg_N |
| ("no parameters allowed for this call", First (Actuals)); |
| goto Leave; |
| end if; |
| |
| Set_Etype (N, Standard_Void_Type); |
| Set_Analyzed (N); |
| |
| elsif Is_Entity_Name (P) |
| and then Is_Record_Type (Etype (Entity (P))) |
| and then Remote_AST_I_Dereference (P) |
| then |
| goto Leave; |
| |
| elsif Is_Entity_Name (P) |
| and then Ekind (Entity (P)) /= E_Entry_Family |
| then |
| if Is_Access_Type (Etype (P)) |
| and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type |
| and then No (Actuals) |
| and then Comes_From_Source (N) |
| then |
| Error_Msg_N ("missing explicit dereference in call", N); |
| end if; |
| |
| Analyze_Call_And_Resolve; |
| |
| -- If the prefix is the simple name of an entry family, this is a |
| -- parameterless call from within the task body itself. |
| |
| elsif Is_Entity_Name (P) |
| and then Nkind (P) = N_Identifier |
| and then Ekind (Entity (P)) = E_Entry_Family |
| and then Present (Actuals) |
| and then No (Next (First (Actuals))) |
| then |
| -- Can be call to parameterless entry family. What appears to be the |
| -- sole argument is in fact the entry index. Rewrite prefix of node |
| -- accordingly. Source representation is unchanged by this |
| -- transformation. |
| |
| New_N := |
| Make_Indexed_Component (Loc, |
| Prefix => |
| Make_Selected_Component (Loc, |
| Prefix => New_Occurrence_Of (Scope (Entity (P)), Loc), |
| Selector_Name => New_Occurrence_Of (Entity (P), Loc)), |
| Expressions => Actuals); |
| Set_Name (N, New_N); |
| Set_Etype (New_N, Standard_Void_Type); |
| Set_Parameter_Associations (N, No_List); |
| Analyze_Call_And_Resolve; |
| |
| elsif Nkind (P) = N_Explicit_Dereference then |
| if Ekind (Etype (P)) = E_Subprogram_Type then |
| Analyze_Call_And_Resolve; |
| else |
| Error_Msg_N ("expect access to procedure in call", P); |
| end if; |
| |
| -- The name can be a selected component or an indexed component that |
| -- yields an access to subprogram. Such a prefix is legal if the call |
| -- has parameter associations. |
| |
| elsif Is_Access_Type (Etype (P)) |
| and then Ekind (Designated_Type (Etype (P))) = E_Subprogram_Type |
| then |
| if Present (Actuals) then |
| Analyze_Call_And_Resolve; |
| else |
| Error_Msg_N ("missing explicit dereference in call ", N); |
| end if; |
| |
| -- If not an access to subprogram, then the prefix must resolve to the |
| -- name of an entry, entry family, or protected operation. |
| |
| -- For the case of a simple entry call, P is a selected component where |
| -- the prefix is the task and the selector name is the entry. A call to |
| -- a protected procedure will have the same syntax. If the protected |
| -- object contains overloaded operations, the entity may appear as a |
| -- function, the context will select the operation whose type is Void. |
| |
| elsif Nkind (P) = N_Selected_Component |
| and then Ekind_In (Entity (Selector_Name (P)), E_Entry, |
| E_Function, |
| E_Procedure) |
| then |
| -- When front-end inlining is enabled, as with SPARK_Mode, a call |
| -- in prefix notation may still be missing its controlling argument, |
| -- so perform the transformation now. |
| |
| if SPARK_Mode = On and then In_Inlined_Body then |
| declare |
| Subp : constant Entity_Id := Entity (Selector_Name (P)); |
| Typ : constant Entity_Id := Etype (Prefix (P)); |
| |
| begin |
| if Is_Tagged_Type (Typ) |
| and then Present (First_Formal (Subp)) |
| and then (Etype (First_Formal (Subp)) = Typ |
| or else |
| Class_Wide_Type (Etype (First_Formal (Subp))) = Typ) |
| and then Try_Object_Operation (P) |
| then |
| return; |
| |
| else |
| Analyze_Call_And_Resolve; |
| end if; |
| end; |
| |
| else |
| Analyze_Call_And_Resolve; |
| end if; |
| |
| elsif Nkind (P) = N_Selected_Component |
| and then Ekind (Entity (Selector_Name (P))) = E_Entry_Family |
| and then Present (Actuals) |
| and then No (Next (First (Actuals))) |
| then |
| -- Can be call to parameterless entry family. What appears to be the |
| -- sole argument is in fact the entry index. Rewrite prefix of node |
| -- accordingly. Source representation is unchanged by this |
| -- transformation. |
| |
| New_N := |
| Make_Indexed_Component (Loc, |
| Prefix => New_Copy (P), |
| Expressions => Actuals); |
| Set_Name (N, New_N); |
| Set_Etype (New_N, Standard_Void_Type); |
| Set_Parameter_Associations (N, No_List); |
| Analyze_Call_And_Resolve; |
| |
| -- For the case of a reference to an element of an entry family, P is |
| -- an indexed component whose prefix is a selected component (task and |
| -- entry family), and whose index is the entry family index. |
| |
| elsif Nkind (P) = N_Indexed_Component |
| and then Nkind (Prefix (P)) = N_Selected_Component |
| and then Ekind (Entity (Selector_Name (Prefix (P)))) = E_Entry_Family |
| then |
| Analyze_Call_And_Resolve; |
| |
| -- If the prefix is the name of an entry family, it is a call from |
| -- within the task body itself. |
| |
| elsif Nkind (P) = N_Indexed_Component |
| and then Nkind (Prefix (P)) = N_Identifier |
| and then Ekind (Entity (Prefix (P))) = E_Entry_Family |
| then |
| New_N := |
| Make_Selected_Component (Loc, |
| Prefix => |
| New_Occurrence_Of (Scope (Entity (Prefix (P))), Loc), |
| Selector_Name => New_Occurrence_Of (Entity (Prefix (P)), Loc)); |
| Rewrite (Prefix (P), New_N); |
| Analyze (P); |
| Analyze_Call_And_Resolve; |
| |
| -- In Ada 2012. a qualified expression is a name, but it cannot be a |
| -- procedure name, so the construct can only be a qualified expression. |
| |
| elsif Nkind (P) = N_Qualified_Expression |
| and then Ada_Version >= Ada_2012 |
| then |
| Rewrite (N, Make_Code_Statement (Loc, Expression => P)); |
| Analyze (N); |
| |
| -- Anything else is an error |
| |
| else |
| Error_Msg_N ("invalid procedure or entry call", N); |
| end if; |
| |
| <<Leave>> |
| Restore_Ghost_Region (Saved_GM, Saved_IGR); |
| end Analyze_Procedure_Call; |
| |
| ------------------------------ |
| -- Analyze_Return_Statement -- |
| ------------------------------ |
| |
| procedure Analyze_Return_Statement (N : Node_Id) is |
| pragma Assert (Nkind_In (N, N_Extended_Return_Statement, |
| N_Simple_Return_Statement)); |
| |
| Returns_Object : constant Boolean := |
| Nkind (N) = N_Extended_Return_Statement |
| or else |
| (Nkind (N) = N_Simple_Return_Statement |
| and then Present (Expression (N))); |
| -- True if we're returning something; that is, "return <expression>;" |
| -- or "return Result : T [:= ...]". False for "return;". Used for error |
| -- checking: If Returns_Object is True, N should apply to a function |
| -- body; otherwise N should apply to a procedure body, entry body, |
| -- accept statement, or extended return statement. |
| |
| function Find_What_It_Applies_To return Entity_Id; |
| -- Find the entity representing the innermost enclosing body, accept |
| -- statement, or extended return statement. If the result is a callable |
| -- construct or extended return statement, then this will be the value |
| -- of the Return_Applies_To attribute. Otherwise, the program is |
| -- illegal. See RM-6.5(4/2). |
| |
| ----------------------------- |
| -- Find_What_It_Applies_To -- |
| ----------------------------- |
| |
| function Find_What_It_Applies_To return Entity_Id is |
| Result : Entity_Id := Empty; |
| |
| begin |
| -- Loop outward through the Scope_Stack, skipping blocks, loops, |
| -- and postconditions. |
| |
| for J in reverse 0 .. Scope_Stack.Last loop |
| Result := Scope_Stack.Table (J).Entity; |
| exit when not Ekind_In (Result, E_Block, E_Loop) |
| and then Chars (Result) /= Name_uPostconditions; |
| end loop; |
| |
| pragma Assert (Present (Result)); |
| return Result; |
| end Find_What_It_Applies_To; |
| |
| -- Local declarations |
| |
| Scope_Id : constant Entity_Id := Find_What_It_Applies_To; |
| Kind : constant Entity_Kind := Ekind (Scope_Id); |
| Loc : constant Source_Ptr := Sloc (N); |
| Stm_Entity : constant Entity_Id := |
| New_Internal_Entity |
| (E_Return_Statement, Current_Scope, Loc, 'R'); |
| |
| -- Start of processing for Analyze_Return_Statement |
| |
| begin |
| Set_Return_Statement_Entity (N, Stm_Entity); |
| |
| Set_Etype (Stm_Entity, Standard_Void_Type); |
| Set_Return_Applies_To (Stm_Entity, Scope_Id); |
| |
| -- Place Return entity on scope stack, to simplify enforcement of 6.5 |
| -- (4/2): an inner return statement will apply to this extended return. |
| |
| if Nkind (N) = N_Extended_Return_Statement then |
| Push_Scope (Stm_Entity); |
| end if; |
| |
| -- Check that pragma No_Return is obeyed. Don't complain about the |
| -- implicitly-generated return that is placed at the end. |
| |
| if No_Return (Scope_Id) and then Comes_From_Source (N) then |
| Error_Msg_N ("RETURN statement not allowed (No_Return)", N); |
| end if; |
| |
| -- Warn on any unassigned OUT parameters if in procedure |
| |
| if Ekind (Scope_Id) = E_Procedure then |
| Warn_On_Unassigned_Out_Parameter (N, Scope_Id); |
| end if; |
| |
| -- Check that functions return objects, and other things do not |
| |
| if Kind = E_Function or else Kind = E_Generic_Function then |
| if not Returns_Object then |
| Error_Msg_N ("missing expression in return from function", N); |
| end if; |
| |
| elsif Kind = E_Procedure or else Kind = E_Generic_Procedure then |
| if Returns_Object then |
| Error_Msg_N ("procedure cannot return value (use function)", N); |
| end if; |
| |
| elsif Kind = E_Entry or else Kind = E_Entry_Family then |
| if Returns_Object then |
| if Is_Protected_Type (Scope (Scope_Id)) then |
| Error_Msg_N ("entry body cannot return value", N); |
| else |
| Error_Msg_N ("accept statement cannot return value", N); |
| end if; |
| end if; |
| |
| elsif Kind = E_Return_Statement then |
| |
| -- We are nested within another return statement, which must be an |
| -- extended_return_statement. |
| |
| if Returns_Object then |
| if Nkind (N) = N_Extended_Return_Statement then |
| Error_Msg_N |
| ("extended return statement cannot be nested (use `RETURN;`)", |
| N); |
| |
| -- Case of a simple return statement with a value inside extended |
| -- return statement. |
| |
| else |
| Error_Msg_N |
| ("return nested in extended return statement cannot return " |
| & "value (use `RETURN;`)", N); |
| end if; |
| end if; |
| |
| else |
| Error_Msg_N ("illegal context for return statement", N); |
| end if; |
| |
| if Ekind_In (Kind, E_Function, E_Generic_Function) then |
| Analyze_Function_Return (N); |
| |
| elsif Ekind_In (Kind, E_Procedure, E_Generic_Procedure) then |
| Set_Return_Present (Scope_Id); |
| end if; |
| |
| if Nkind (N) = N_Extended_Return_Statement then |
| End_Scope; |
| end if; |
| |
| Kill_Current_Values (Last_Assignment_Only => True); |
| Check_Unreachable_Code (N); |
| |
| Analyze_Dimension (N); |
| end Analyze_Return_Statement; |
| |
| ------------------------------------- |
| -- Analyze_Simple_Return_Statement -- |
| ------------------------------------- |
| |
| procedure Analyze_Simple_Return_Statement (N : Node_Id) is |
| begin |
| if Present (Expression (N)) then |
| Mark_Coextensions (N, Expression (N)); |
| end if; |
| |
| Analyze_Return_Statement (N); |
| end Analyze_Simple_Return_Statement; |
| |
| ------------------------- |
| -- Analyze_Return_Type -- |
| ------------------------- |
| |
| procedure Analyze_Return_Type (N : Node_Id) is |
| Designator : constant Entity_Id := Defining_Entity (N); |
| Typ : Entity_Id := Empty; |
| |
| begin |
| -- Normal case where result definition does not indicate an error |
| |
| if Result_Definition (N) /= Error then |
| if Nkind (Result_Definition (N)) = N_Access_Definition then |
| Check_SPARK_05_Restriction |
| ("access result is not allowed", Result_Definition (N)); |
| |
| -- Ada 2005 (AI-254): Handle anonymous access to subprograms |
| |
| declare |
| AD : constant Node_Id := |
| Access_To_Subprogram_Definition (Result_Definition (N)); |
| begin |
| if Present (AD) and then Protected_Present (AD) then |
| Typ := Replace_Anonymous_Access_To_Protected_Subprogram (N); |
| else |
| Typ := Access_Definition (N, Result_Definition (N)); |
| end if; |
| end; |
| |
| Set_Parent (Typ, Result_Definition (N)); |
| Set_Is_Local_Anonymous_Access (Typ); |
| Set_Etype (Designator, Typ); |
| |
| -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
| |
| Null_Exclusion_Static_Checks (N); |
| |
| -- Subtype_Mark case |
| |
| else |
| Find_Type (Result_Definition (N)); |
| Typ := Entity (Result_Definition (N)); |
| Set_Etype (Designator, Typ); |
| |
| -- Unconstrained array as result is not allowed in SPARK |
| |
| if Is_Array_Type (Typ) and then not Is_Constrained (Typ) then |
| Check_SPARK_05_Restriction |
| ("returning an unconstrained array is not allowed", |
| Result_Definition (N)); |
| end if; |
| |
| -- Ada 2005 (AI-231): Ensure proper usage of null exclusion |
| |
| Null_Exclusion_Static_Checks (N); |
| |
| -- If a null exclusion is imposed on the result type, then create |
| -- a null-excluding itype (an access subtype) and use it as the |
| -- function's Etype. Note that the null exclusion checks are done |
| -- right before this, because they don't get applied to types that |
| -- do not come from source. |
| |
| if Is_Access_Type (Typ) and then Null_Exclusion_Present (N) then |
| Set_Etype (Designator, |
| Create_Null_Excluding_Itype |
| (T => Typ, |
| Related_Nod => N, |
| Scope_Id => Scope (Current_Scope))); |
| |
| -- The new subtype must be elaborated before use because |
| -- it is visible outside of the function. However its base |
| -- type may not be frozen yet, so the reference that will |
| -- force elaboration must be attached to the freezing of |
| -- the base type. |
| |
| -- If the return specification appears on a proper body, |
| -- the subtype will have been created already on the spec. |
| |
| if Is_Frozen (Typ) then |
| if Nkind (Parent (N)) = N_Subprogram_Body |
| and then Nkind (Parent (Parent (N))) = N_Subunit |
| then |
| null; |
| else |
| Build_Itype_Reference (Etype (Designator), Parent (N)); |
| end if; |
| |
| else |
| Ensure_Freeze_Node (Typ); |
| |
| declare |
| IR : constant Node_Id := Make_Itype_Reference (Sloc (N)); |
| begin |
| Set_Itype (IR, Etype (Designator)); |
| Append_Freeze_Actions (Typ, New_List (IR)); |
| end; |
| end if; |
| |
| else |
| Set_Etype (Designator, Typ); |
| end if; |
| |
| if Ekind (Typ) = E_Incomplete_Type |
| or else (Is_Class_Wide_Type (Typ) |
| and then Ekind (Root_Type (Typ)) = E_Incomplete_Type) |
| then |
| -- AI05-0151: Tagged incomplete types are allowed in all formal |
| -- parts. Untagged incomplete types are not allowed in bodies. |
| -- As a consequence, limited views cannot appear in a basic |
| -- declaration that is itself within a body, because there is |
| -- no point at which the non-limited view will become visible. |
| |
| if Ada_Version >= Ada_2012 then |
| if From_Limited_With (Typ) and then In_Package_Body then |
| Error_Msg_NE |
| ("invalid use of incomplete type&", |
| Result_Definition (N), Typ); |
| |
| -- The return type of a subprogram body cannot be of a |
| -- formal incomplete type. |
| |
| elsif Is_Generic_Type (Typ) |
| and then Nkind (Parent (N)) = N_Subprogram_Body |
| then |
| Error_Msg_N |
| ("return type cannot be a formal incomplete type", |
| Result_Definition (N)); |
| |
| elsif Is_Class_Wide_Type (Typ) |
| and then Is_Generic_Type (Root_Type (Typ)) |
| and then Nkind (Parent (N)) = N_Subprogram_Body |
| then |
| Error_Msg_N |
| ("return type cannot be a formal incomplete type", |
| Result_Definition (N)); |
| |
| elsif Is_Tagged_Type (Typ) then |
| null; |
| |
| -- Use is legal in a thunk generated for an operation |
| -- inherited from a progenitor. |
| |
| elsif Is_Thunk (Designator) |
| and then Present (Non_Limited_View (Typ)) |
| then |
| null; |
| |
| elsif Nkind (Parent (N)) = N_Subprogram_Body |
| or else Nkind_In (Parent (Parent (N)), N_Accept_Statement, |
| N_Entry_Body) |
| then |
| Error_Msg_NE |
| ("invalid use of untagged incomplete type&", |
| Designator, Typ); |
| end if; |
| |
| -- The type must be completed in the current package. This |
| -- is checked at the end of the package declaration when |
| -- Taft-amendment types are identified. If the return type |
| -- is class-wide, there is no required check, the type can |
| -- be a bona fide TAT. |
| |
| if Ekind (Scope (Current_Scope)) = E_Package |
| and then In_Private_Part (Scope (Current_Scope)) |
| and then not Is_Class_Wide_Type (Typ) |
| then |
| Append_Elmt (Designator, Private_Dependents (Typ)); |
| end if; |
| |
| else |
| Error_Msg_NE |
| ("invalid use of incomplete type&", Designator, Typ); |
| end if; |
| end if; |
| end if; |
| |
| -- Case where result definition does indicate an error |
| |
| else |
| Set_Etype (Designator, Any_Type); |
| end if; |
| end Analyze_Return_Type; |
| |
| ----------------------------- |
| -- Analyze_Subprogram_Body -- |
| ----------------------------- |
| |
| procedure Analyze_Subprogram_Body (N : Node_Id) is |
| Loc : constant Source_Ptr := Sloc (N); |
| Body_Spec : constant Node_Id := Specification (N); |
| Body_Id : constant Entity_Id := Defining_Entity (Body_Spec); |
| |
| begin |
| if Debug_Flag_C then |
| Write_Str ("==> subprogram body "); |
| Write_Name (Chars (Body_Id)); |
| Write_Str (" from "); |
| Write_Location (Loc); |
| Write_Eol; |
| Indent; |
| end if; |
| |
| Trace_Scope (N, Body_Id, " Analyze subprogram: "); |
| |
| -- The real work is split out into the helper, so it can do "return;" |
| -- without skipping the debug output: |
| |
| Analyze_Subprogram_Body_Helper (N); |
| |
| if Debug_Flag_C then |
| Outdent; |
| Write_Str ("<== subprogram body "); |
| Write_Name (Chars (Body_Id)); |
| Write_Str (" from "); |
| Write_Location (Loc); |
| Write_Eol; |
| end if; |
| end Analyze_Subprogram_Body; |
| |
| ------------------------------------ |
| -- Analyze_Subprogram_Body_Helper -- |
| ------------------------------------ |
| |
| -- This procedure is called for regular subprogram bodies, generic bodies, |
| -- and for subprogram stubs of both kinds. In the case of stubs, only the |
| -- specification matters, and is used to create a proper declaration for |
| -- the subprogram, or to perform conformance checks. |
| |
| -- WARNING: This routine manages Ghost regions. Return statements must be |
| -- replaced by gotos that jump to the end of the routine and restore the |
| -- Ghost mode. |
| |
| procedure Analyze_Subprogram_Body_Helper (N : Node_Id) is |
| Body_Spec : Node_Id := Specification (N); |
| Body_Id : Entity_Id := Defining_Entity (Body_Spec); |
| Loc : constant Source_Ptr := Sloc (N); |
| Prev_Id : constant Entity_Id := Current_Entity_In_Scope (Body_Id); |
| |
| Conformant : Boolean; |
| Desig_View : Entity_Id := Empty; |
| Exch_Views : Elist_Id := No_Elist; |
| HSS : Node_Id; |
| Mask_Types : Elist_Id := No_Elist; |
| Prot_Typ : Entity_Id := Empty; |
| Spec_Decl : Node_Id := Empty; |
| Spec_Id : Entity_Id; |
| |
| Last_Real_Spec_Entity : Entity_Id := Empty; |
| -- When we analyze a separate spec, the entity chain ends up containing |
| -- the formals, as well as any itypes generated during analysis of the |
| -- default expressions for parameters, or the arguments of associated |
| -- precondition/postcondition pragmas (which are analyzed in the context |
| -- of the spec since they have visibility on formals). |
| -- |
| -- These entities belong with the spec and not the body. However we do |
| -- the analysis of the body in the context of the spec (again to obtain |
| -- visibility to the formals), and all the entities generated during |
| -- this analysis end up also chained to the entity chain of the spec. |
| -- But they really belong to the body, and there is circuitry to move |
| -- them from the spec to the body. |
| -- |
| -- However, when we do this move, we don't want to move the real spec |
| -- entities (first para above) to the body. The Last_Real_Spec_Entity |
| -- variable points to the last real spec entity, so we only move those |
| -- chained beyond that point. It is initialized to Empty to deal with |
| -- the case where there is no separate spec. |
| |
| function Body_Has_Contract return Boolean; |
| -- Check whether unanalyzed body has an aspect or pragma that may |
| -- generate a SPARK contract. |
| |
| function Body_Has_SPARK_Mode_On return Boolean; |
| -- Check whether SPARK_Mode On applies to the subprogram body, either |
| -- because it is specified directly on the body, or because it is |
| -- inherited from the enclosing subprogram or package. |
| |
| procedure Build_Subprogram_Declaration; |
| -- Create a matching subprogram declaration for subprogram body N |
| |
| procedure Check_Anonymous_Return; |
| -- Ada 2005: if a function returns an access type that denotes a task, |
| -- or a type that contains tasks, we must create a master entity for |
| -- the anonymous type, which typically will be used in an allocator |
| -- in the body of the function. |
| |
| procedure Check_Inline_Pragma (Spec : in out Node_Id); |
| -- Look ahead to recognize a pragma that may appear after the body. |
| -- If there is a previous spec, check that it appears in the same |
| -- declarative part. If the pragma is Inline_Always, perform inlining |
| -- unconditionally, otherwise only if Front_End_Inlining is requested. |
| -- If the body acts as a spec, and inlining is required, we create a |
| -- subprogram declaration for it, in order to attach the body to inline. |
| -- If pragma does not appear after the body, check whether there is |
| -- an inline pragma before any local declarations. |
| |
| procedure Check_Missing_Return; |
| -- Checks for a function with a no return statements, and also performs |
| -- the warning checks implemented by Check_Returns. In formal mode, also |
| -- verify that a function ends with a RETURN and that a procedure does |
| -- not contain any RETURN. |
| |
| function Disambiguate_Spec return Entity_Id; |
| -- When a primitive is declared between the private view and the full |
| -- view of a concurrent type which implements an interface, a special |
| -- mechanism is used to find the corresponding spec of the primitive |
| -- body. |
| |
| function Exchange_Limited_Views (Subp_Id : Entity_Id) return Elist_Id; |
| -- Ada 2012 (AI05-0151): Detect whether the profile of Subp_Id contains |
| -- incomplete types coming from a limited context and replace their |
| -- limited views with the non-limited ones. Return the list of changes |
| -- to be used to undo the transformation. |
| |
| function Is_Private_Concurrent_Primitive |
| (Subp_Id : Entity_Id) return Boolean; |
| -- Determine whether subprogram Subp_Id is a primitive of a concurrent |
| -- type that implements an interface and has a private view. |
| |
| function Mask_Unfrozen_Types (Spec_Id : Entity_Id) return Elist_Id; |
| -- N is the body generated for an expression function that is not a |
| -- completion and Spec_Id the defining entity of its spec. Mark all |
| -- the not-yet-frozen types referenced by the simple return statement |
| -- of the function as formally frozen. |
| |
| procedure Restore_Limited_Views (Restore_List : Elist_Id); |
| -- Undo the transformation done by Exchange_Limited_Views. |
| |
| procedure Set_Trivial_Subprogram (N : Node_Id); |
| -- Sets the Is_Trivial_Subprogram flag in both spec and body of the |
| -- subprogram whose body is being analyzed. N is the statement node |
| -- causing the flag to be set, if the following statement is a return |
| -- of an entity, we mark the entity as set in source to suppress any |
| -- warning on the stylized use of function stubs with a dummy return. |
| |
| procedure Unmask_Unfrozen_Types (Unmask_List : Elist_Id); |
| -- Undo the transformation done by Mask_Unfrozen_Types |
| |
| procedure Verify_Overriding_Indicator; |
| -- If there was a previous spec, the entity has been entered in the |
| -- current scope previously. If the body itself carries an overriding |
| -- indicator, check that it is consistent with the known status of the |
| -- entity. |
| |
| ----------------------- |
| -- Body_Has_Contract -- |
| ----------------------- |
| |
| function Body_Has_Contract return Boolean is |
| Decls : constant List_Id := Declarations (N); |
| Item : Node_Id; |
| |
| begin |
| -- Check for aspects that may generate a contract |
| |
| if Present (Aspect_Specifications (N)) then |
| Item := First (Aspect_Specifications (N)); |
| while Present (Item) loop |
| if Is_Subprogram_Contract_Annotation (Item) then |
| return True; |
| end if; |
| |
| Next (Item); |
| end loop; |
| end if; |
| |
| -- Check for pragmas that may generate a contract |
| |
| if Present (Decls) then |
| Item := First (Decls); |
| while Present (Item) loop |
| if Nkind (Item) = N_Pragma |
| and then Is_Subprogram_Contract_Annotation (Item) |
| then |
| return True; |
| end if; |
| |
| Next (Item); |
| end loop; |
| end if; |
| |
| return False; |
| end Body_Has_Contract; |
| |
| ---------------------------- |
| -- Body_Has_SPARK_Mode_On -- |
| ---------------------------- |
| |
| function Body_Has_SPARK_Mode_On return Boolean is |
| Decls : constant List_Id := Declarations (N); |
| Item : Node_Id; |
| |
| begin |
| -- Check for SPARK_Mode aspect |
| |
| if Present (Aspect_Specifications (N)) then |
| Item := First (Aspect_Specifications (N)); |
| while Present (Item) loop |
| if Get_Aspect_Id (Item) = Aspect_SPARK_Mode then |
| return Get_SPARK_Mode_From_Annotation (Item) = On; |
| end if; |
| |
| Next (Item); |
| end loop; |
| end if; |
| |
| -- Check for SPARK_Mode pragma |
| |
| if Present (Decls) then |
| Item := First (Decls); |
| while Present (Item) loop |
| |
| -- Pragmas that apply to a subprogram body are usually grouped |
| -- together. Look for a potential pragma SPARK_Mode among them. |
| |
| if Nkind (Item) = N_Pragma then |
| if Get_Pragma_Id (Item) = Pragma_SPARK_Mode then |
| return Get_SPARK_Mode_From_Annotation (Item) = On; |
| end if; |
| |
| -- Otherwise the first non-pragma declarative item terminates |
| -- the region where pragma SPARK_Mode may appear. |
| |
| else |
| exit; |
| end if; |
| |
| Next (Item); |
| end loop; |
| end if; |
| |
| -- Otherwise, the applicable SPARK_Mode is inherited from the |
| -- enclosing subprogram or package. |
| |
| return SPARK_Mode = On; |
| end Body_Has_SPARK_Mode_On; |
| |
| ---------------------------------- |
| -- Build_Subprogram_Declaration -- |
| ---------------------------------- |
| |
| procedure Build_Subprogram_Declaration is |
| procedure Move_Pragmas (From : Node_Id; To : Node_Id); |
| -- Relocate certain categorization pragmas from the declarative list |
| -- of subprogram body From and insert them after node To. The pragmas |
| -- in question are: |
| -- Ghost |
| -- Volatile_Function |
| -- Also copy pragma SPARK_Mode if present in the declarative list |
| -- of subprogram body From and insert it after node To. This pragma |
| -- should not be moved, as it applies to the body too. |
| |
| ------------------ |
| -- Move_Pragmas -- |
| ------------------ |
| |
| procedure Move_Pragmas (From : Node_Id; To : Node_Id) is |
| Decl : Node_Id; |
| Next_Decl : Node_Id; |
| |
| begin |
| pragma Assert (Nkind (From) = N_Subprogram_Body); |
| |
| -- The destination node must be part of a list, as the pragmas are |
| -- inserted after it. |
| |
| pragma Assert (Is_List_Member (To)); |
| |
| -- Inspect the declarations of the subprogram body looking for |
| -- specific pragmas. |
| |
| Decl := First (Declarations (N)); |
| while Present (Decl) loop |
| Next_Decl := Next (Decl); |
| |
| if Nkind (Decl) = N_Pragma then |
| if Pragma_Name_Unmapped (Decl) = Name_SPARK_Mode then |
| Insert_After (To, New_Copy_Tree (Decl)); |
| |
| elsif Nam_In (Pragma_Name_Unmapped (Decl), |
| Name_Ghost, |
| Name_Volatile_Function) |
| then |
| Remove (Decl); |
| Insert_After (To, Decl); |
| end if; |
| end if; |
| |
| Decl := Next_Decl; |
| end loop; |
| end Move_Pragmas; |
| |
| -- Local variables |
| |
| Decl : Node_Id; |
| Subp_Decl : Node_Id; |
| |
| -- Start of processing for Build_Subprogram_Declaration |
| |
| begin |
| -- Create a matching subprogram spec using the profile of the body. |
| -- The structure of the tree is identical, but has new entities for |
| -- the defining unit name and formal parameters. |
| |
| Subp_Decl := |
| Make_Subprogram_Declaration (Loc, |
| Specification => Copy_Subprogram_Spec (Body_Spec)); |
| Set_Comes_From_Source (Subp_Decl, True); |
| |
| -- Also mark parameters as coming from source |
| |
| if Present (Parameter_Specifications (Specification (Subp_Decl))) then |
| declare |
| Form : Entity_Id; |
| begin |
| Form := |
| First (Parameter_Specifications (Specification (Subp_Decl))); |
| |
| while Present (Form) loop |
| Set_Comes_From_Source (Defining_Identifier (Form), True); |
| Next (Form); |
| end loop; |
| end; |
| end if; |
| |
| -- Relocate the aspects and relevant pragmas from the subprogram body |
| -- to the generated spec because it acts as the initial declaration. |
| |
| Insert_Before (N, Subp_Decl); |
| Move_Aspects (N, To => Subp_Decl); |
| Move_Pragmas (N, To => Subp_Decl); |
| |
| -- Ensure that the generated corresponding spec and original body |
| -- share the same SPARK_Mode pragma or aspect. As a result, both have |
| -- the same SPARK_Mode attributes, and the global SPARK_Mode value is |
| -- correctly set for local subprograms. |
| |
| Copy_SPARK_Mode_Aspect (Subp_Decl, To => N); |
| |
| Analyze (Subp_Decl); |
| |
| -- Propagate the attributes Rewritten_For_C and Corresponding_Proc to |
| -- the body since the expander may generate calls using that entity. |
| -- Required to ensure that Expand_Call rewrites calls to this |
| -- function by calls to the built procedure. |
| |
| if Modify_Tree_For_C |
| and then Nkind (Body_Spec) = N_Function_Specification |
| and then |
| Rewritten_For_C (Defining_Entity (Specification (Subp_Decl))) |
| then |
| Set_Rewritten_For_C (Defining_Entity (Body_Spec)); |
| Set_Corresponding_Procedure (Defining_Entity (Body_Spec), |
| Corresponding_Procedure |
| (Defining_Entity (Specification (Subp_Decl)))); |
| end if; |
| |
| -- Analyze any relocated source pragmas or pragmas created for aspect |
| -- specifications. |
| |
| Decl := Next (Subp_Decl); |
| while Present (Decl) loop |
| |
| -- Stop the search for pragmas once the body has been reached as |
| -- this terminates the region where pragmas may appear. |
| |
| if Decl = N then |
| exit; |
| |
| elsif Nkind (Decl) = N_Pragma then |
| Analyze (Decl); |
| end if; |
| |
| Next (Decl); |
| end loop; |
| |
| Spec_Id := Defining_Entity (Subp_Decl); |
| Set_Corresponding_Spec (N, Spec_Id); |
| |
| -- Mark the generated spec as a source construct to ensure that all |
| -- calls to it are properly registered in ALI files for GNATprove. |
| |
| Set_Comes_From_Source (Spec_Id, True); |
| |
| -- Ensure that the specs of the subprogram declaration and its body |
| -- are identical, otherwise they will appear non-conformant due to |
| -- rewritings in the default values of formal parameters. |
| |
| Body_Spec := Copy_Subprogram_Spec (Body_Spec); |
| Set_Specification (N, Body_Spec); |
| Body_Id := Analyze_Subprogram_Specification (Body_Spec); |
| end Build_Subprogram_Declaration; |
| |
| ---------------------------- |
| -- Check_Anonymous_Return -- |
| ---------------------------- |
| |
| procedure Check_Anonymous_Return is |
| Decl : Node_Id; |
| Par : Node_Id; |
| Scop : Entity_Id; |
| |
| begin |
| if Present (Spec_Id) then |
| Scop := Spec_Id; |
| else |
| Scop := Body_Id; |
| end if; |
| |
| if Ekind (Scop) = E_Function |
| and then Ekind (Etype (Scop)) = E_Anonymous_Access_Type |
| and then not Is_Thunk (Scop) |
| |
| -- Skip internally built functions which handle the case of |
| -- a null access (see Expand_Interface_Conversion) |
| |
| and then not (Is_Interface (Designated_Type (Etype (Scop))) |
| and then not Comes_From_Source (Parent (Scop))) |
| |
| and then (Has_Task (Designated_Type (Etype (Scop))) |
| or else |
| (Is_Class_Wide_Type (Designated_Type (Etype (Scop))) |
| and then |
| Is_Limited_Record (Designated_Type (Etype (Scop))))) |
| and then Expander_Active |
| |
| -- Avoid cases with no tasking support |
| |
| and then RTE_Available (RE_Current_Master) |
| and then not Restriction_Active (No_Task_Hierarchy) |
| then |
| Decl := |
| Make_Object_Declaration (Loc, |
| Defining_Identifier => |
| Make_Defining_Identifier (Loc, Name_uMaster), |
| Constant_Present => True, |
| Object_Definition => |
| New_Occurrence_Of (RTE (RE_Master_Id), Loc), |
| Expression => |
| Make_Explicit_Dereference (Loc, |
| New_Occurrence_Of (RTE (RE_Current_Master), Loc))); |
| |
| if Present (Declarations (N)) then |
| Prepend (Decl, Declarations (N)); |
| else |
| Set_Declarations (N, New_List (Decl)); |
| end if; |
| |
| Set_Master_Id (Etype (Scop), Defining_Identifier (Decl)); |
| Set_Has_Master_Entity (Scop); |
| |
| -- Now mark the containing scope as a task master |
| |
| Par := N; |
| while Nkind (Par) /= N_Compilation_Unit loop |
| Par := Parent (Par); |
| pragma Assert (Present (Par)); |
| |
| -- If we fall off the top, we are at the outer level, and |
| -- the environment task is our effective master, so nothing |
| -- to mark. |
| |
| if Nkind_In |
| (Par, N_Task_Body, N_Block_Statement, N_Subprogram_Body) |
| then |
| Set_Is_Task_Master (Par, True); |
| exit; |
| end if; |
| end loop; |
| end if; |
| end Check_Anonymous_Return; |
| |
| ------------------------- |
| -- Check_Inline_Pragma -- |
| ------------------------- |
| |
| procedure Check_Inline_Pragma (Spec : in out Node_Id) is |
| Prag : Node_Id; |
| Plist : List_Id; |
| |
| function Is_Inline_Pragma (N : Node_Id) return Boolean; |
| -- True when N is a pragma Inline or Inline_Always that applies |
| -- to this subprogram. |
| |
| ----------------------- |
| -- Is_Inline_Pragma -- |
| ----------------------- |
| |
| function Is_Inline_Pragma (N : Node_Id) return Boolean is |
| begin |
| if Nkind (N) = N_Pragma |
| and then |
| (Pragma_Name_Unmapped (N) = Name_Inline_Always |
| or else (Pragma_Name_Unmapped (N) = Name_Inline |
| and then |
| (Front_End_Inlining or else Optimization_Level > 0))) |
| and then Present (Pragma_Argument_Associations (N)) |
| then |
| declare |
| Pragma_Arg : Node_Id := |
| Expression (First (Pragma_Argument_Associations (N))); |
| begin |
| if Nkind (Pragma_Arg) = N_Selected_Component then |
| Pragma_Arg := Selector_Name (Pragma_Arg); |
| end if; |
| |
| return Chars (Pragma_Arg) = Chars (Body_Id); |
| end; |
| |
| else |
| return False; |
| end if; |
| end Is_Inline_Pragma; |
| |
| -- Start of processing for Check_Inline_Pragma |
| |
| begin |
| if not Expander_Active then |
| return; |
| end if; |
| |
| if Is_List_Member (N) |
| and then Present (Next (N)) |
| and then Is_Inline_Pragma (Next (N)) |
| then |
| Prag := Next (N); |
| |
| elsif Nkind (N) /= N_Subprogram_Body_Stub |
| and then Present (Declarations (N)) |
| and then Is_Inline_Pragma (First (Declarations (N))) |
| then |
| Prag := First (Declarations (N)); |
| |
| else |
| Prag := Empty; |
| end if; |
| |
| if Present (Prag) then |
| if Present (Spec_Id) then |
| if Is_List_Member (N) |
| and then Is_List_Member (Unit_Declaration_Node (Spec_Id)) |
| and then In_Same_List (N, Unit_Declaration_Node (Spec_Id)) |
| then |
| Analyze (Prag); |
| end if; |
| |
| else |
| -- Create a subprogram declaration, to make treatment uniform. |
| -- Make the sloc of the subprogram name that of the entity in |
| -- the body, so that style checks find identical strings. |
| |
| declare |
| Subp : constant Entity_Id := |
| Make_Defining_Identifier |
| (Sloc (Body_Id), Chars (Body_Id)); |
| Decl : constant Node_Id := |
| Make_Subprogram_Declaration (Loc, |
| Specification => |
| New_Copy_Tree (Specification (N))); |
| |
| begin |
| -- Link the body and the generated spec |
| |
| Set_Corresponding_Body (Decl, Body_Id); |
| Set_Corresponding_Spec (N, Subp); |
| |
| Set_Defining_Unit_Name (Specification (Decl), Subp); |
| |
| -- To ensure proper coverage when body is inlined, indicate |
| -- whether the subprogram comes from source. |
| |
| Set_Comes_From_Source (Subp, Comes_From_Source (N)); |
| |
| if Present (First_Formal (Body_Id)) then |
| Plist := Copy_Parameter_List (Body_Id); |
| Set_Parameter_Specifications |
| (Specification (Decl), Plist); |
| end if; |
| |
| -- Move aspects to the new spec |
| |
| if Has_Aspects (N) then |
| Move_Aspects (N, To => Decl); |
| end if; |
| |
| Insert_Before (N, Decl); |
| Analyze (Decl); |
| Analyze (Prag); |
| Set_Has_Pragma_Inline (Subp); |
| |
| if Pragma_Name (Prag) = Name_Inline_Always then |
| Set_Is_Inlined (Subp); |
| Set_Has_Pragma_Inline_Always (Subp); |
| end if; |
| |
| -- Prior to copying the subprogram body to create a template |
| -- for it for subsequent inlining, remove the pragma from |
| -- the current body so that the copy that will produce the |
| -- new body will start from a completely unanalyzed tree. |
| |
| if Nkind (Parent (Prag)) = N_Subprogram_Body then |
| Rewrite (Prag, Make_Null_Statement (Sloc (Prag))); |
| end if; |
| |
| Spec := Subp; |
| end; |
| end if; |
| end if; |
| end Check_Inline_Pragma; |
| |
| -------------------------- |
| -- Check_Missing_Return -- |
| -------------------------- |
| |
| procedure Check_Missing_Return is |
| Id : Entity_Id; |
| Missing_Ret : Boolean; |
| |
| begin |
| if Nkind (Body_Spec) = N_Function_Specification then |
| if Present (Spec_Id) then |
| Id := Spec_Id; |
| else |
| Id := Body_Id; |
| end if; |
| |
| if Return_Present (Id) then |
| Check_Returns (HSS, 'F', Missing_Ret); |
| |
| if Missing_Ret then |
| Set_Has_Missing_Return (Id); |
| end if; |
| |
| -- Within a premature instantiation of a package with no body, we |
| -- build completions of the functions therein, with a Raise |
| -- statement. No point in complaining about a missing return in |
| -- this case. |
| |
| elsif Ekind (Id) = E_Function |
| and then In_Instance |
| and then Present (Statements (HSS)) |
| and then Nkind (First (Statements (HSS))) = N_Raise_Program_Error |
| then |
| null; |
| |
| elsif Is_Generic_Subprogram (Id) |
| or else not Is_Machine_Code_Subprogram (Id) |
| then |
| Error_Msg_N ("missing RETURN statement in function body", N); |
| end if; |
| |
| -- If procedure with No_Return, check returns |
| |
| elsif Nkind (Body_Spec) = N_Procedure_Specification then |
| if Present (Spec_Id) then |
| Id := Spec_Id; |
| else |
| Id := Body_Id; |
| end if; |
| |
| if No_Return (Id) then |
| Check_Returns (HSS, 'P', Missing_Ret, Id); |
| end if; |
| end if; |
| |
| -- Special checks in SPARK mode |
| |
| if Nkind (Body_Spec) = N_Function_Specification then |
| |
| -- In SPARK mode, last statement of a function should be a return |
| |
| declare |
| Stat : constant Node_Id := Last_Source_Statement (HSS); |
| begin |
| if Present (Stat) |
| and then not Nkind_In (Stat, N_Simple_Return_Statement, |
| N_Extended_Return_Statement) |
| then |
| Check_SPARK_05_Restriction |
| ("last statement in function should be RETURN", Stat); |
| end if; |
| end; |
| |
| -- In SPARK mode, verify that a procedure has no return |
| |
| elsif Nkind (Body_Spec) = N_Procedure_Specification then |
| if Present (Spec_Id) then |
| Id := Spec_Id; |
| else |
| Id := Body_Id; |
| end if; |
| |
| -- Would be nice to point to return statement here, can we |
| -- borrow the Check_Returns procedure here ??? |
| |
| if Return_Present (Id) then |
| Check_SPARK_05_Restriction |
| ("procedure should not have RETURN", N); |
| end if; |
| end if; |
| end Check_Missing_Return; |
| |
| ----------------------- |
| -- Disambiguate_Spec -- |
| ----------------------- |
| |
| function Disambiguate_Spec return Entity_Id is |
| Priv_Spec : Entity_Id; |
| Spec_N : Entity_Id; |
| |
| procedure Replace_Types (To_Corresponding : Boolean); |
| -- Depending on the flag, replace the type of formal parameters of |
| -- Body_Id if it is a concurrent type implementing interfaces with |
| -- the corresponding record type or the other way around. |
| |
| procedure Replace_Types (To_Corresponding : Boolean) is |
| Formal : Entity_Id; |
| Formal_Typ : Entity_Id; |
| |
| begin |
| Formal := First_Formal (Body_Id); |
| while Present (Formal) loop |
| Formal_Typ := Etype (Formal); |
| |
| if Is_Class_Wide_Type (Formal_Typ) then |
| Formal_Typ := Root_Type (Formal_Typ); |
| end if; |
| |
| -- From concurrent type to corresponding record |
| |
| if To_Corresponding then |
| if Is_Concurrent_Type (Formal_Typ) |
| and then Present (Corresponding_Record_Type (Formal_Typ)) |
| and then |
| Present (Interfaces |
| (Corresponding_Record_Type (Formal_Typ))) |
| then |
| Set_Etype (Formal, |
| Corresponding_Record_Type (Formal_Typ)); |
| end if; |
| |
| -- From corresponding record to concurrent type |
| |
| else |
| if Is_Concurrent_Record_Type (Formal_Typ) |
| and then Present (Interfaces (Formal_Typ)) |
| then |
| Set_Etype (Formal, |
| Corresponding_Concurrent_Type (Formal_Typ)); |
| end if; |
| end if; |
| |
| Next_Formal (Formal); |
| end loop; |
| end Replace_Types; |
| |
| -- Start of processing for Disambiguate_Spec |
| |
| begin |
| -- Try to retrieve the specification of the body as is. All error |
| -- messages are suppressed because the body may not have a spec in |
| -- its current state. |
| |
| Spec_N := Find_Corresponding_Spec (N, False); |
| |
| -- It is possible that this is the body of a primitive declared |
| -- between a private and a full view of a concurrent type. The |
| -- controlling parameter of the spec carries the concurrent type, |
| -- not the corresponding record type as transformed by Analyze_ |
| -- Subprogram_Specification. In such cases, we undo the change |
| -- made by the analysis of the specification and try to find the |
| -- spec again. |
| |
| -- Note that wrappers already have their corresponding specs and |
| -- bodies set during their creation, so if the candidate spec is |
| -- a wrapper, then we definitely need to swap all types to their |
| -- original concurrent status. |
| |
| if No (Spec_N) |
| or else Is_Primitive_Wrapper (Spec_N) |
| then |
| -- Restore all references of corresponding record types to the |
| -- original concurrent types. |
| |
| Replace_Types (To_Corresponding => False); |
| Priv_Spec := Find_Corresponding_Spec (N, False); |
| |
| -- The current body truly belongs to a primitive declared between |
| -- a private and a full view. We leave the modified body as is, |
| -- and return the true spec. |
| |
| if Present (Priv_Spec) |
| and then Is_Private_Primitive (Priv_Spec) |
| then |
| return Priv_Spec; |
| end if; |
| |
| -- In case that this is some sort of error, restore the original |
| -- state of the body. |
| |
| Replace_Types (To_Corresponding => True); |
| end if; |
| |
| return Spec_N; |
| end Disambiguate_Spec; |
| |
| ---------------------------- |
| -- Exchange_Limited_Views -- |
| ---------------------------- |
| |
| function Exchange_Limited_Views (Subp_Id : Entity_Id) return Elist_Id is |
| Result : Elist_Id := No_Elist; |
| |
| procedure Detect_And_Exchange (Id : Entity_Id); |
| -- Determine whether Id's type denotes an incomplete type associated |
| -- with a limited with clause and exchange the limited view with the |
| -- non-limited one when available. Note that the non-limited view |
| -- may exist because of a with_clause in another unit in the context, |
| -- but cannot be used because the current view of the enclosing unit |
| -- is still a limited view. |
| |
| ------------------------- |
| -- Detect_And_Exchange -- |
| ------------------------- |
| |
| procedure Detect_And_Exchange (Id : Entity_Id) is |
| Typ : constant Entity_Id := Etype (Id); |
| begin |
| if From_Limited_With (Typ) |
| and then Has_Non_Limited_View (Typ) |
| and then not From_Limited_With (Scope (Typ)) |
| then |
| if No (Result) then |
| Result := New_Elmt_List; |
| end if; |
| |
| Prepend_Elmt (Typ, Result); |
| Prepend_Elmt (Id, Result); |
| Set_Etype (Id, Non_Limited_View (Typ)); |
| end if; |
| end Detect_And_Exchange; |
| |
| -- Local variables |
| |
| Formal : Entity_Id; |
| |
| -- Start of processing for Exchange_Limited_Views |
| |
| begin |
| -- Do not process subprogram bodies as they already use the non- |
| -- limited view of types. |
| |
| if not Ekind_In (Subp_Id, E_Function, E_Procedure) then |
| return No_Elist; |
| end if; |
| |
| -- Examine all formals and swap views when applicable |
| |
| Formal := First_Formal (Subp_Id); |
| while Present (Formal) loop |
| Detect_And_Exchange (Formal); |
| |
| Next_Formal (Formal); |
| end loop; |
| |
| -- Process the return type of a function |
| |
| if Ekind (Subp_Id) = E_Function then |
| Detect_And_Exchange (Subp_Id); |
| end if; |
| |
| return Result; |
| end Exchange_Limited_Views; |
| |
| ------------------------------------- |
| -- Is_Private_Concurrent_Primitive -- |
| ------------------------------------- |
| |
| function Is_Private_Concurrent_Primitive |
| (Subp_Id : Entity_Id) return Boolean |
| is |
| Formal_Typ : Entity_Id; |
| |
| begin |
| if Present (First_Formal (Subp_Id)) then |
| Formal_Typ := Etype (First_Formal (Subp_Id)); |
| |
| if Is_Concurrent_Record_Type (Formal_Typ) then |
| if Is_Class_Wide_Type (Formal_Typ) then |
| Formal_Typ := Root_Type (Formal_Typ); |
| end if; |
| |
| Formal_Typ := Corresponding_Concurrent_Type (Formal_Typ); |
| end if; |
| |
| -- The type of the first formal is a concurrent tagged type with |
| -- a private view. |
| |
| return |
| Is_Concurrent_Type (Formal_Typ) |
| and then Is_Tagged_Type (Formal_Typ) |
| and then Has_Private_Declaration (Formal_Typ); |
| end if; |
| |
| return False; |
| end Is_Private_Concurrent_Primitive; |
| |
| ------------------------- |
| -- Mask_Unfrozen_Types -- |
| ------------------------- |
| |
| function Mask_Unfrozen_Types (Spec_Id : Entity_Id) return Elist_Id is |
| Result : Elist_Id := No_Elist; |
| |
| function Mask_Type_Refs (Node : Node_Id) return Traverse_Result; |
| -- Mask all types referenced in the subtree rooted at Node |
| |
| -------------------- |
| -- Mask_Type_Refs -- |
| -------------------- |
| |
| function Mask_Type_Refs (Node : Node_Id) return Traverse_Result is |
| procedure Mask_Type (Typ : Entity_Id); |
| -- ??? what does this do? |
| |
| --------------- |
| -- Mask_Type -- |
| --------------- |
| |
| procedure Mask_Type (Typ : Entity_Id) is |
| begin |
| -- Skip Itypes created by the preanalysis |
| |
| if Is_Itype (Typ) |
| and then Scope_Within_Or_Same (Scope (Typ), Spec_Id) |
| then |
| return; |
| end if; |
| |
| if not Is_Frozen (Typ) then |
| if Scope (Typ) /= Current_Scope then |
| Set_Is_Frozen (Typ); |
| Append_New_Elmt (Typ, Result); |
| else |
| Freeze_Before (N, Typ); |
| end if; |
| end if; |
| end Mask_Type; |
| |
| -- Start of processing for Mask_Type_Refs |
| |
| begin |
| if Is_Entity_Name (Node) and then Present (Entity (Node)) then |
| Mask_Type (Etype (Entity (Node))); |
| |
| if Ekind_In (Entity (Node), E_Component, E_Discriminant) then |
| Mask_Type (Scope (Entity (Node))); |
| end if; |
| |
| elsif Nkind_In (Node, N_Aggregate, N_Null, N_Type_Conversion) |
| and then Present (Etype (Node)) |
| then |
| Mask_Type (Etype (Node)); |
| end if; |
| |
| return OK; |
| end Mask_Type_Refs; |
| |
| procedure Mask_References is new Traverse_Proc (Mask_Type_Refs); |
| |
| -- Local variables |
| |
| Return_Stmt : constant Node_Id := |
| First (Statements (Handled_Statement_Sequence (N))); |
| |
| -- Start of processing for Mask_Unfrozen_Types |
| |
| begin |
| pragma Assert (Nkind (Return_Stmt) = N_Simple_Return_Statement); |
| |
| Mask_References (Expression (Return_Stmt)); |
| |
| return Result; |
| end Mask_Unfrozen_Types; |
| |
| --------------------------- |
| -- Restore_Limited_Views -- |
| --------------------------- |
| |
| procedure Restore_Limited_Views (Restore_List : Elist_Id) is |
| Elmt : Elmt_Id := First_Elmt (Restore_List); |
| Id : Entity_Id; |
| |
| begin |
| while Present (Elmt) loop |
| Id := Node (Elmt); |
| Next_Elmt (Elmt); |
| Set_Etype (Id, Node (Elmt)); |
| Next_Elmt (Elmt); |
| end loop; |
| end Restore_Limited_Views; |
| |
| ---------------------------- |
| -- Set_Trivial_Subprogram -- |
| ---------------------------- |
| |
| procedure Set_Trivial_Subprogram (N : Node_Id) is |
| Nxt : constant Node_Id := Next (N); |
| |
| begin |
| Set_Is_Trivial_Subprogram (Body_Id); |
| |
| if Present (Spec_Id) then |
| Set_Is_Trivial_Subprogram (Spec_Id); |
| end if; |
| |
| if Present (Nxt) |
| and then Nkind (Nxt) = N_Simple_Return_Statement |
| and then No (Next (Nxt)) |
| and then Present (Expression (Nxt)) |
| and then Is_Entity_Name (Expression (Nxt)) |
| then |
| Set_Never_Set_In_Source (Entity (Expression (Nxt)), False); |
| end if; |
| end Set_Trivial_Subprogram; |
| |
| --------------------------- |
| -- Unmask_Unfrozen_Types -- |
| --------------------------- |
| |
| procedure Unmask_Unfrozen_Types (Unmask_List : Elist_Id) is |
| Elmt : Elmt_Id := First_Elmt (Unmask_List); |
| |
| begin |
| while Present (Elmt) loop |
| Set_Is_Frozen (Node (Elmt), False); |
| Next_Elmt (Elmt); |
| end loop; |
| end Unmask_Unfrozen_Types; |
| |
| --------------------------------- |
| -- Verify_Overriding_Indicator -- |
| --------------------------------- |
| |
| procedure Verify_Overriding_Indicator is |
| begin |
| if Must_Override (Body_Spec) then |
| if Nkind (Spec_Id) = N_Defining_Operator_Symbol |
| and then Operator_Matches_Spec (Spec_Id, Spec_Id) |
| then |
| null; |
| |
| -- Overridden controlled primitives may have had their |
| -- Overridden_Operation field cleared according to the setting of |
| -- the Is_Hidden flag. An issue arises, however, when analyzing |
| -- an instance that may have manipulated the flag during |
| -- expansion. As a result, we add an exception for this case. |
| |
| elsif not Present (Overridden_Operation (Spec_Id)) |
| and then not (Nam_In (Chars (Spec_Id), Name_Adjust, |
| Name_Finalize, |
| Name_Initialize) |
| and then In_Instance) |
| then |
| Error_Msg_NE |
| ("subprogram& is not overriding", Body_Spec, Spec_Id); |
| |
| -- Overriding indicators aren't allowed for protected subprogram |
| -- bodies (see the Confirmation in Ada Comment AC95-00213). Change |
| -- this to a warning if -gnatd.E is enabled. |
| |
| elsif Ekind (Scope (Spec_Id)) = E_Protected_Type then |
| Error_Msg_Warn := Error_To_Warning; |
| Error_Msg_N |
| ("<<overriding indicator not allowed for protected " |
| & "subprogram body", Body_Spec); |
| end if; |
| |
| elsif Must_Not_Override (Body_Spec) then |
| if Present (Overridden_Operation (Spec_Id)) then |
| Error_Msg_NE |
| ("subprogram& overrides inherited operation", |
| Body_Spec, Spec_Id); |
| |
| elsif Nkind (Spec_Id) = N_Defining_Operator_Symbol |
| and then Operator_Matches_Spec (Spec_Id, Spec_Id) |
| then |
| Error_Msg_NE |
| ("subprogram& overrides predefined operator ", |
| Body_Spec, Spec_Id); |
| |
| -- Overriding indicators aren't allowed for protected subprogram |
| -- bodies (see the Confirmation in Ada Comment AC95-00213). Change |
| -- this to a warning if -gnatd.E is enabled. |
| |
| elsif Ekind (Scope (Spec_Id)) = E_Protected_Type then |
| Error_Msg_Warn := Error_To_Warning; |
| |
| Error_Msg_N |
| ("<<overriding indicator not allowed " |
| & "for protected subprogram body", Body_Spec); |
| |
| -- If this is not a primitive operation, then the overriding |
| -- indicator is altogether illegal. |
| |
| elsif not Is_Primitive (Spec_Id) then |
| Error_Msg_N |
| ("overriding indicator only allowed " |
| & "if subprogram is primitive", Body_Spec); |
| end if; |
| |
| -- If checking the style rule and the operation overrides, then |
| -- issue a warning about a missing overriding_indicator. Protected |
| -- subprogram bodies are excluded from this style checking, since |
| -- they aren't primitives (even though their declarations can |
| -- override) and aren't allowed to have an overriding_indicator. |
| |
| elsif Style_Check |
| and then Present (Overridden_Operation (Spec_Id)) |
| and then Ekind (Scope (Spec_Id)) /= E_Protected_Type |
| then |
| pragma Assert (Unit_Declaration_Node (Body_Id) = N); |
| Style.Missing_Overriding (N, Body_Id); |
| |
| elsif Style_Check |
| and then Can_Override_Operator (Spec_Id) |
| and then not In_Predefined_Unit (Spec_Id) |
| then |
| pragma Assert (Unit_Declaration_Node (Body_Id) = N); |
| Style.Missing_Overriding (N, Body_Id); |
| end if; |
| end Verify_Overriding_Indicator; |
| |
| -- Local variables |
| |
| Body_Nod : Node_Id := Empty; |
| Minimum_Acc_Objs : List_Id := No_List; |
| |
| Saved_GM : constant Ghost_Mode_Type := Ghost_Mode; |
| Saved_IGR : constant Node_Id := Ignored_Ghost_Region; |
| Saved_EA : constant Boolean := Expander_Active; |
| Saved_ISMP : constant Boolean := |
| Ignore_SPARK_Mode_Pragmas_In_Instance; |
| -- Save the Ghost and SPARK mode-related data to restore on exit |
| |
| -- Start of processing for Analyze_Subprogram_Body_Helper |
| |
| begin |
| -- A [generic] subprogram body freezes the contract of the nearest |
| -- enclosing package body and all other contracts encountered in the |
| -- same declarative part up to and excluding the subprogram body: |
| |
| -- package body Nearest_Enclosing_Package |
| -- with Refined_State => (State => Constit) |
| -- is |
| -- Constit : ...; |
| |
| -- procedure Freezes_Enclosing_Package_Body |
| -- with Refined_Depends => (Input => Constit) ... |
| |
| -- This ensures that any annotations referenced by the contract of the |
| -- [generic] subprogram body are available. This form of freezing is |
| -- decoupled from the usual Freeze_xxx mechanism because it must also |
| -- work in the context of generics where normal freezing is disabled. |
| |
| -- Only bodies coming from source should cause this type of freezing. |
| -- Expression functions that act as bodies and complete an initial |
| -- declaration must be included in this category, hence the use of |
| -- Original_Node. |
| |
| if Comes_From_Source (Original_Node (N)) then |
| Freeze_Previous_Contracts (N); |
| end if; |
| |
| -- Generic subprograms are handled separately. They always have a |
| -- generic specification. Determine whether current scope has a |
| -- previous declaration. |
| |
| -- If the subprogram body is defined within an instance of the same |
| -- name, the instance appears as a package renaming, and will be hidden |
| -- within the subprogram. |
| |
| if Present (Prev_Id) |
| and then not Is_Overloadable (Prev_Id) |
| and then (Nkind (Parent (Prev_Id)) /= N_Package_Renaming_Declaration |
| or else Comes_From_Source (Prev_Id)) |
| then |
| if Is_Generic_Subprogram (Prev_Id) then |
| Spec_Id := Prev_Id; |
| |
| -- A subprogram body is Ghost when it is stand-alone and subject |
| -- to pragma Ghost or when the corresponding spec is Ghost. Set |
| -- the mode now to ensure that any nodes generated during analysis |
| -- and expansion are properly marked as Ghost. |
| |
| Mark_And_Set_Ghost_Body (N, Spec_Id); |
| |
| -- If the body completes the initial declaration of a compilation |
| -- unit which is subject to pragma Elaboration_Checks, set the |
| -- model specified by the pragma because it applies to all parts |
| -- of the unit. |
| |
| Install_Elaboration_Model (Spec_Id); |
| |
| Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); |
| Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); |
| |
| Analyze_Generic_Subprogram_Body (N, Spec_Id); |
| |
| if Nkind (N) = N_Subprogram_Body then |
| HSS := Handled_Statement_Sequence (N); |
| Check_Missing_Return; |
| end if; |
| |
| goto Leave; |
| |
| -- Otherwise a previous entity conflicts with the subprogram name. |
| -- Attempting to enter name will post error. |
| |
| else |
| Enter_Name (Body_Id); |
| goto Leave; |
| end if; |
| |
| -- Non-generic case, find the subprogram declaration, if one was seen, |
| -- or enter new overloaded entity in the current scope. If the |
| -- Current_Entity is the Body_Id itself, the unit is being analyzed as |
| -- part of the context of one of its subunits. No need to redo the |
| -- analysis. |
| |
| elsif Prev_Id = Body_Id and then Has_Completion (Body_Id) then |
| goto Leave; |
| |
| else |
| Body_Id := Analyze_Subprogram_Specification (Body_Spec); |
| |
| if Nkind (N) = N_Subprogram_Body_Stub |
| or else No (Corresponding_Spec (N)) |
| then |
| if Is_Private_Concurrent_Primitive (Body_Id) then |
| Spec_Id := Disambiguate_Spec; |
| |
| -- A subprogram body is Ghost when it is stand-alone and |
| -- subject to pragma Ghost or when the corresponding spec is |
| -- Ghost. Set the mode now to ensure that any nodes generated |
| -- during analysis and expansion are properly marked as Ghost. |
| |
| Mark_And_Set_Ghost_Body (N, Spec_Id); |
| |
| -- If the body completes a compilation unit which is subject |
| -- to pragma Elaboration_Checks, set the model specified by |
| -- the pragma because it applies to all parts of the unit. |
| |
| Install_Elaboration_Model (Spec_Id); |
| |
| else |
| Spec_Id := Find_Corresponding_Spec (N); |
| |
| -- A subprogram body is Ghost when it is stand-alone and |
| -- subject to pragma Ghost or when the corresponding spec is |
| -- Ghost. Set the mode now to ensure that any nodes generated |
| -- during analysis and expansion are properly marked as Ghost. |
| |
| Mark_And_Set_Ghost_Body (N, Spec_Id); |
| |
| -- If the body completes a compilation unit which is subject |
| -- to pragma Elaboration_Checks, set the model specified by |
| -- the pragma because it applies to all parts of the unit. |
| |
| Install_Elaboration_Model (Spec_Id); |
| |
| -- In GNATprove mode, if the body has no previous spec, create |
| -- one so that the inlining machinery can operate properly. |
| -- Transfer aspects, if any, to the new spec, so that they |
| -- are legal and can be processed ahead of the body. |
| -- We make two copies of the given spec, one for the new |
| -- declaration, and one for the body. |
| |
| if No (Spec_Id) and then GNATprove_Mode |
| |
| -- Inlining does not apply during preanalysis of code |
| |
| and then Full_Analysis |
| |
| -- Inlining only applies to full bodies, not stubs |
| |
| and then Nkind (N) /= N_Subprogram_Body_Stub |
| |
| -- Inlining only applies to bodies in the source code, not to |
| -- those generated by the compiler. In particular, expression |
| -- functions, whose body is generated by the compiler, are |
| -- treated specially by GNATprove. |
| |
| and then Comes_From_Source (Body_Id) |
| |
| -- This cannot be done for a compilation unit, which is not |
| -- in a context where we can insert a new spec. |
| |
| and then Is_List_Member (N) |
| |
| -- Inlining only applies to subprograms without contracts, |
| -- as a contract is a sign that GNATprove should perform a |
| -- modular analysis of the subprogram instead of a contextual |
| -- analysis at each call site. The same test is performed in |
| -- Inline.Can_Be_Inlined_In_GNATprove_Mode. It is repeated |
| -- here in another form (because the contract has not been |
| -- attached to the body) to avoid front-end errors in case |
| -- pragmas are used instead of aspects, because the |
| -- corresponding pragmas in the body would not be transferred |
| -- to the spec, leading to legality errors. |
| |
| and then not Body_Has_Contract |
| and then not Inside_A_Generic |
| then |
| Build_Subprogram_Declaration; |
| |
| -- If this is a function that returns a constrained array, and |
| -- we are generating SPARK_For_C, create subprogram declaration |
| -- to simplify subsequent C generation. |
| |
| elsif No (Spec_Id) |
| and then Modify_Tree_For_C |
| and then Nkind (Body_Spec) = N_Function_Specification |
| and then Is_Array_Type (Etype (Body_Id)) |
| and then Is_Constrained (Etype (Body_Id)) |
| then |
| Build_Subprogram_Declaration; |
| end if; |
| end if; |
| |
| -- If this is a duplicate body, no point in analyzing it |
| |
| if Error_Posted (N) then |
| goto Leave; |
| end if; |
| |
| -- A subprogram body should cause freezing of its own declaration, |
| -- but if there was no previous explicit declaration, then the |
| -- subprogram will get frozen too late (there may be code within |
| -- the body that depends on the subprogram having been frozen, |
| -- such as uses of extra formals), so we force it to be frozen |
| -- here. Same holds if the body and spec are compilation units. |
| -- Finally, if the return type is an anonymous access to protected |
| -- subprogram, it must be frozen before the body because its |
| -- expansion has generated an equivalent type that is used when |
| -- elaborating the body. |
| |
| -- An exception in the case of Ada 2012, AI05-177: The bodies |
| -- created for expression functions do not freeze. |
| |
| if No (Spec_Id) |
| and then Nkind (Original_Node (N)) /= N_Expression_Function |
| then |
| Freeze_Before (N, Body_Id); |
| |
| elsif Nkind (Parent (N)) = N_Compilation_Unit then |
| Freeze_Before (N, Spec_Id); |
| |
| elsif Is_Access_Subprogram_Type (Etype (Body_Id)) then |
| Freeze_Before (N, Etype (Body_Id)); |
| end if; |
| |
| else |
| Spec_Id := Corresponding_Spec (N); |
| |
| -- A subprogram body is Ghost when it is stand-alone and subject |
| -- to pragma Ghost or when the corresponding spec is Ghost. Set |
| -- the mode now to ensure that any nodes generated during analysis |
| -- and expansion are properly marked as Ghost. |
| |
| Mark_And_Set_Ghost_Body (N, Spec_Id); |
| |
| -- If the body completes the initial declaration of a compilation |
| -- unit which is subject to pragma Elaboration_Checks, set the |
| -- model specified by the pragma because it applies to all parts |
| -- of the unit. |
| |
| Install_Elaboration_Model (Spec_Id); |
| end if; |
| end if; |
| |
| -- Deactivate expansion inside the body of ignored Ghost entities, |
| -- as this code will ultimately be ignored. This avoids requiring the |
| -- presence of run-time units which are not needed. Only do this for |
| -- user entities, as internally generated entitities might still need |
| -- to be expanded (e.g. those generated for types). |
| |
| if Present (Ignored_Ghost_Region) |
| and then Comes_From_Source (Body_Id) |
| then |
| Expander_Active := False; |
| end if; |
| |
| -- Previously we scanned the body to look for nested subprograms, and |
| -- rejected an inline directive if nested subprograms were present, |
| -- because the back-end would generate conflicting symbols for the |
| -- nested bodies. This is now unnecessary. |
| |
| -- Look ahead to recognize a pragma Inline that appears after the body |
| |
| Check_Inline_Pragma (Spec_Id); |
| |
| -- Deal with special case of a fully private operation in the body of |
| -- the protected type. We must create a declaration for the subprogram, |
| -- in order to attach the protected subprogram that will be used in |
| -- internal calls. We exclude compiler generated bodies from the |
| -- expander since the issue does not arise for those cases. |
| |
| if No (Spec_Id) |
| and then Comes_From_Source (N) |
| and then Is_Protected_Type (Current_Scope) |
| then |
| Spec_Id := Build_Private_Protected_Declaration (N); |
| end if; |
| |
| -- If we are generating C and this is a function returning a constrained |
| -- array type for which we must create a procedure with an extra out |
| -- parameter, build and analyze the body now. The procedure declaration |
| -- has already been created. We reuse the source body of the function, |
| -- because in an instance it may contain global references that cannot |
| -- be reanalyzed. The source function itself is not used any further, |
| -- so we mark it as having a completion. If the subprogram is a stub the |
| -- transformation is done later, when the proper body is analyzed. |
| |
| if Expander_Active |
| and then Modify_Tree_For_C |
| and then Present (Spec_Id) |
| and then Ekind (Spec_Id) = E_Function |
| and then Nkind (N) /= N_Subprogram_Body_Stub |
| and then Rewritten_For_C (Spec_Id) |
| then |
| Set_Has_Completion (Spec_Id); |
| |
| Rewrite (N, Build_Procedure_Body_Form (Spec_Id, N)); |
| Analyze (N); |
| |
| -- The entity for the created procedure must remain invisible, so it |
| -- does not participate in resolution of subsequent references to the |
| -- function. |
| |
| Set_Is_Immediately_Visible (Corresponding_Spec (N), False); |
| goto Leave; |
| end if; |
| |
| -- If a separate spec is present, then deal with freezing issues |
| |
| if Present (Spec_Id) then |
| Spec_Decl := Unit_Declaration_Node (Spec_Id); |
| Verify_Overriding_Indicator; |
| |
| -- In general, the spec will be frozen when we start analyzing the |
| -- body. However, for internally generated operations, such as |
| -- wrapper functions for inherited operations with controlling |
| -- results, the spec may not have been frozen by the time we expand |
| -- the freeze actions that include the bodies. In particular, extra |
| -- formals for accessibility or for return-in-place may need to be |
| -- generated. Freeze nodes, if any, are inserted before the current |
| -- body. These freeze actions are also needed in ASIS mode and in |
| -- Compile_Only mode to enable the proper back-end type annotations. |
| -- They are necessary in any case to ensure proper elaboration order |
| -- in gigi. |
| |
| if Nkind (N) = N_Subprogram_Body |
| and then Was_Expression_Function (N) |
| and then not Has_Completion (Spec_Id) |
| and then Serious_Errors_Detected = 0 |
| and then (Expander_Active |
| or else ASIS_Mode |
| or else Operating_Mode = Check_Semantics |
| or else Is_Ignored_Ghost_Entity (Spec_Id)) |
| then |
| -- The body generated for an expression function that is not a |
| -- completion is a freeze point neither for the profile nor for |
| -- anything else. That's why, in order to prevent any freezing |
| -- during analysis, we need to mask types declared outside the |
| -- expression (and in an outer scope) that are not yet frozen. |
| -- This also needs to be done in the case of an ignored Ghost |
| -- expression function, where the expander isn't active. |
| |
| Set_Is_Frozen (Spec_Id); |
| Mask_Types := Mask_Unfrozen_Types (Spec_Id); |
| |
| elsif not Is_Frozen (Spec_Id) |
| and then Serious_Errors_Detected = 0 |
| then |
| Set_Has_Delayed_Freeze (Spec_Id); |
| Freeze_Before (N, Spec_Id); |
| end if; |
| end if; |
| |
| -- If the subprogram has a class-wide clone, build its body as a copy |
| -- of the original body, and rewrite body of original subprogram as a |
| -- wrapper that calls the clone. If N is a stub, this construction will |
| -- take place when the proper body is analyzed. No action needed if this |
| -- subprogram has been eliminated. |
| |
| if Present (Spec_Id) |
| and then Present (Class_Wide_Clone (Spec_Id)) |
| and then (Comes_From_Source (N) or else Was_Expression_Function (N)) |
| and then Nkind (N) /= N_Subprogram_Body_Stub |
| and then not (Expander_Active and then Is_Eliminated (Spec_Id)) |
| then |
| Build_Class_Wide_Clone_Body (Spec_Id, N); |
| |
| -- This is the new body for the existing primitive operation |
| |
| Rewrite (N, Build_Class_Wide_Clone_Call |
| (Sloc (N), New_List, Spec_Id, Parent (Spec_Id))); |
| Set_Has_Completion (Spec_Id, False); |
| Analyze (N); |
| return; |
| end if; |
| |
| -- Place subprogram on scope stack, and make formals visible. If there |
| -- is a spec, the visible entity remains that of the spec. |
| |
| if Present (Spec_Id) then |
| Generate_Reference (Spec_Id, Body_Id, 'b', Set_Ref => False); |
| |
| if Is_Child_Unit (Spec_Id) then |
| Generate_Reference (Spec_Id, Scope (Spec_Id), 'k', False); |
| end if; |
| |
| if Style_Check then |
| Style.Check_Identifier (Body_Id, Spec_Id); |
| end if; |
| |
| Set_Is_Compilation_Unit (Body_Id, Is_Compilation_Unit (Spec_Id)); |
| Set_Is_Child_Unit (Body_Id, Is_Child_Unit (Spec_Id)); |
| |
| if Is_Abstract_Subprogram (Spec_Id) then |
| Error_Msg_N ("an abstract subprogram cannot have a body", N); |
| goto Leave; |
| |
| else |
| Set_Convention (Body_Id, Convention (Spec_Id)); |
| Set_Has_Completion (Spec_Id); |
| |
| if Is_Protected_Type (Scope (Spec_Id)) then |
| Prot_Typ := Scope (Spec_Id); |
| end if; |
| |
| -- If this is a body generated for a renaming, do not check for |
| -- full conformance. The check is redundant, because the spec of |
| -- the body is a copy of the spec in the renaming declaration, |
| -- and the test can lead to spurious errors on nested defaults. |
| |
| if Present (Spec_Decl) |
| and then not Comes_From_Source (N) |
| and then |
| (Nkind (Original_Node (Spec_Decl)) = |
| N_Subprogram_Renaming_Declaration |
| or else (Present (Corresponding_Body (Spec_Decl)) |
| and then |
| Nkind (Unit_Declaration_Node |
| (Corresponding_Body (Spec_Decl))) = |
| N_Subprogram_Renaming_Declaration)) |
| then |
| Conformant := True; |
| |
| -- Conversely, the spec may have been generated for specless body |
| -- with an inline pragma. The entity comes from source, which is |
| -- both semantically correct and necessary for proper inlining. |
| -- The subprogram declaration itself is not in the source. |
| |
| elsif Comes_From_Source (N) |
| and then Present (Spec_Decl) |
| and then not Comes_From_Source (Spec_Decl) |
| and then Has_Pragma_Inline (Spec_Id) |
| then |
| Conformant := True; |
| |
| else |
| Check_Conformance |
| (Body_Id, Spec_Id, |
| Fully_Conformant, True, Conformant, Body_Id); |
| end if; |
| |
| -- If the body is not fully conformant, we have to decide if we |
| -- should analyze it or not. If it has a really messed up profile |
| -- then we probably should not analyze it, since we will get too |
| -- many bogus messages. |
| |
| -- Our decision is to go ahead in the non-fully conformant case |
| -- only if it is at least mode conformant with the spec. Note |
| -- that the call to Check_Fully_Conformant has issued the proper |
| -- error messages to complain about the lack of conformance. |
| |
| if not Conformant |
| and then not Mode_Conformant (Body_Id, Spec_Id) |
| then |
| goto Leave; |
| end if; |
| end if; |
| |
| -- In the case we are dealing with an expression function we check |
| -- the formals attached to the spec instead of the body - so we don't |
| -- reference body formals. |
| |
| if Spec_Id /= Body_Id |
| and then not Is_Expression_Function (Spec_Id) |
| then |
| Reference_Body_Formals (Spec_Id, Body_Id); |
| end if; |
| |
| Set_Ekind (Body_Id, E_Subprogram_Body); |
| |
| if Nkind (N) = N_Subprogram_Body_Stub then |
| Set_Corresponding_Spec_Of_Stub (N, Spec_Id); |
| |
| -- Regular body |
| |
| else |
| Set_Corresponding_Spec (N, Spec_Id); |
| |
| -- Ada 2005 (AI-345): If the operation is a primitive operation |
| -- of a concurrent type, the type of the first parameter has been |
| -- replaced with the corresponding record, which is the proper |
| -- run-time structure to use. However, within the body there may |
| -- be uses of the formals that depend on primitive operations |
| -- of the type (in particular calls in prefixed form) for which |
| -- we need the original concurrent type. The operation may have |
| -- several controlling formals, so the replacement must be done |
| -- for all of them. |
| |
| if Comes_From_Source (Spec_Id) |
| and then Present (First_Entity (Spec_Id)) |
| and then Ekind (Etype (First_Entity (Spec_Id))) = E_Record_Type |
| and then Is_Tagged_Type (Etype (First_Entity (Spec_Id))) |
| and then Present (Interfaces (Etype (First_Entity (Spec_Id)))) |
| and then Present (Corresponding_Concurrent_Type |
| (Etype (First_Entity (Spec_Id)))) |
| then |
| declare |
| Typ : constant Entity_Id := Etype (First_Entity (Spec_Id)); |
| Form : Entity_Id; |
| |
| begin |
| Form := First_Formal (Spec_Id); |
| while Present (Form) loop |
| if Etype (Form) = Typ then |
| Set_Etype (Form, Corresponding_Concurrent_Type (Typ)); |
| end if; |
| |
| Next_Formal (Form); |
| end loop; |
| end; |
| end if; |
| |
| -- Make the formals visible, and place subprogram on scope stack. |
| -- This is also the point at which we set Last_Real_Spec_Entity |
| -- to mark the entities which will not be moved to the body. |
| |
| Install_Formals (Spec_Id); |
| Last_Real_Spec_Entity := Last_Entity (Spec_Id); |
| |
| -- Within an instance, add local renaming declarations so that |
| -- gdb can retrieve the values of actuals more easily. This is |
| -- only relevant if generating code (and indeed we definitely |
| -- do not want these definitions -gnatc mode, because that would |
| -- confuse ASIS). |
| |
| if Is_Generic_Instance (Spec_Id) |
| and then Is_Wrapper_Package (Current_Scope) |
| and then Expander_Active |
| then |
| Build_Subprogram_Instance_Renamings (N, Current_Scope); |
| end if; |
| |
| Push_Scope (Spec_Id); |
| |
| -- Make sure that the subprogram is immediately visible. For |
| -- child units that have no separate spec this is indispensable. |
| -- Otherwise it is safe albeit redundant. |
| |
| Set_Is_Immediately_Visible (Spec_Id); |
| end if; |
| |
| Set_Corresponding_Body (Unit_Declaration_Node (Spec_Id), Body_Id); |
| Set_Is_Obsolescent (Body_Id, Is_Obsolescent (Spec_Id)); |
| Set_Scope (Body_Id, Scope (Spec_Id)); |
| |
| -- Case of subprogram body with no previous spec |
| |
| else |
| -- Check for style warning required |
| |
| if Style_Check |
| |
| -- Only apply check for source level subprograms for which checks |
| -- have not been suppressed. |
| |
| and then Comes_From_Source (Body_Id) |
| and then not Suppress_Style_Checks (Body_Id) |
| |
| -- No warnings within an instance |
| |
| and then not In_Instance |
| |
| -- No warnings for expression functions |
| |
| and then Nkind (Original_Node (N)) /= N_Expression_Function |
| then |
| Style.Body_With_No_Spec (N); |
| end if; |
| |
| New_Overloaded_Entity (Body_Id); |
| |
| if Nkind (N) /= N_Subprogram_Body_Stub then |
| Set_Acts_As_Spec (N); |
| Generate_Definition (Body_Id); |
| Generate_Reference |
| (Body_Id, Body_Id, 'b', Set_Ref => False, Force => True); |
| |
| -- If the body is an entry wrapper created for an entry with |
| -- preconditions, it must be compiled in the context of the |
| -- enclosing synchronized object, because it may mention other |
| -- operations of the type. |
| |
| if Is_Entry_Wrapper (Body_Id) then |
| declare |
| Prot : constant Entity_Id := Etype (First_Entity (Body_Id)); |
| begin |
| Push_Scope (Prot); |
| Install_Declarations (Prot); |
| end; |
| end if; |
| |
| Install_Formals (Body_Id); |
| |
| Push_Scope (Body_Id); |
| end if; |
| |
| -- For stubs and bodies with no previous spec, generate references to |
| -- formals. |
| |
| Generate_Reference_To_Formals (Body_Id); |
| end if; |
| |
| -- Entry barrier functions are generated outside the protected type and |
| -- should not carry the SPARK_Mode of the enclosing context. |
| |
| if Nkind (N) = N_Subprogram_Body |
| and then Is_Entry_Barrier_Function (N) |
| then |
| null; |
| |
| -- The body is generated as part of expression function expansion. When |
| -- the expression function appears in the visible declarations of a |
| -- package, the body is added to the private declarations. Since both |
| -- declarative lists may be subject to a different SPARK_Mode, inherit |
| -- the mode of the spec. |
| |
| -- package P with SPARK_Mode is |
| -- function Expr_Func ... is (...); -- original |
| -- [function Expr_Func ...;] -- generated spec |
| -- -- mode is ON |
| -- private |
| -- pragma SPARK_Mode (Off); |
| -- [function Expr_Func ... is return ...;] -- generated body |
| -- end P; -- mode is ON |
| |
| elsif not Comes_From_Source (N) |
| and then Present (Spec_Id) |
| and then Is_Expression_Function (Spec_Id) |
| then |
| Set_SPARK_Pragma (Body_Id, SPARK_Pragma (Spec_Id)); |
| Set_SPARK_Pragma_Inherited |
| (Body_Id, SPARK_Pragma_Inherited (Spec_Id)); |
| |
| -- Set the SPARK_Mode from the current context (may be overwritten later |
| -- with explicit pragma). Exclude the case where the SPARK_Mode appears |
| -- initially on a stand-alone subprogram body, but is then relocated to |
| -- a generated corresponding spec. In this scenario the mode is shared |
| -- between the spec and body. |
| |
| elsif No (SPARK_Pragma (Body_Id)) then |
| Set_SPARK_Pragma (Body_Id, SPARK_Mode_Pragma); |
| Set_SPARK_Pragma_Inherited (Body_Id); |
| end if; |
| |
| -- A subprogram body may be instantiated or inlined at a later pass. |
| -- Restore the state of Ignore_SPARK_Mode_Pragmas_In_Instance when it |
| -- applied to the initial declaration of the body. |
| |
| if Present (Spec_Id) then |
| if Ignore_SPARK_Mode_Pragmas (Spec_Id) then |
| Ignore_SPARK_Mode_Pragmas_In_Instance := True; |
| end if; |
| |
| else |
| -- Save the state of flag Ignore_SPARK_Mode_Pragmas_In_Instance in |
| -- case the body is instantiated or inlined later and out of context. |
| -- The body uses this attribute to restore the value of the global |
| -- flag. |
| |
| if Ignore_SPARK_Mode_Pragmas_In_Instance then |
| Set_Ignore_SPARK_Mode_Pragmas (Body_Id); |
| |
| elsif Ignore_SPARK_Mode_Pragmas (Body_Id) then |
| Ignore_SPARK_Mode_Pragmas_In_Instance := True; |
| end if; |
| end if; |
| |
| -- Preserve relevant elaboration-related attributes of the context which |
| -- are no longer available or very expensive to recompute once analysis, |
| -- resolution, and expansion are over. |
| |
| if No (Spec_Id) then |
| Mark_Elaboration_Attributes |
| (N_Id => Body_Id, |
| Checks => True, |
| Warnings => True); |
| end if; |
| |
| -- If this is the proper body of a stub, we must verify that the stub |
| -- conforms to the body, and to the previous spec if one was present. |
| -- We know already that the body conforms to that spec. This test is |
| -- only required for subprograms that come from source. |
| |
| if Nkind (Parent (N)) = N_Subunit |
| and then Comes_From_Source (N) |
| and then not Error_Posted (Body_Id) |
| and then Nkind (Corresponding_Stub (Parent (N))) = |
| N_Subprogram_Body_Stub |
| then |
| declare |
| Old_Id : constant Entity_Id := |
| Defining_Entity |
| (Specification (Corresponding_Stub (Parent (N)))); |
| |
| Conformant : Boolean := False; |
| |
| begin |
| if No (Spec_Id) then |
| Check_Fully_Conformant (Body_Id, Old_Id); |
| |
| else |
| Check_Conformance |
| (Body_Id, Old_Id, Fully_Conformant, False, Conformant); |
| |
| if not Conformant then |
| |
| -- The stub was taken to be a new declaration. Indicate that |
| -- it lacks a body. |
| |
| Set_Has_Completion (Old_Id, False); |
| end if; |
| end if; |
| end; |
| end if; |
| |
| Set_Has_Completion (Body_Id); |
| Check_Eliminated (Body_Id); |
| |
| -- Analyze any aspect specifications that appear on the subprogram body |
| -- stub. Stop the analysis now as the stub does not have a declarative |
| -- or a statement part, and it cannot be inlined. |
| |
| if Nkind (N) = N_Subprogram_Body_Stub then |
| if Has_Aspects (N) then |
| Analyze_Aspects_On_Subprogram_Body_Or_Stub (N); |
| end if; |
| |
| goto Leave; |
| end if; |
| |
| -- Handle inlining |
| |
| -- Note: Normally we don't do any inlining if expansion is off, since |
| -- we won't generate code in any case. An exception arises in GNATprove |
| -- mode where we want to expand some calls in place, even with expansion |
| -- disabled, since the inlining eases formal verification. |
| |
| if not GNATprove_Mode |
| and then Expander_Active |
| and then Serious_Errors_Detected = 0 |
| and then Present (Spec_Id) |
| and then Has_Pragma_Inline (Spec_Id) |
| then |
| -- Legacy implementation (relying on front-end inlining) |
| |
| if not Back_End_Inlining then |
| if (Has_Pragma_Inline_Always (Spec_Id) |
| and then not Opt.Disable_FE_Inline_Always) |
| or else (Front_End_Inlining |
| and then not Opt.Disable_FE_Inline) |
| then |
| Build_Body_To_Inline (N, Spec_Id); |
| end if; |
| |
| -- New implementation (relying on back-end inlining) |
| |
| else |
| if Has_Pragma_Inline_Always (Spec_Id) |
| or else Optimization_Level > 0 |
| then |
| -- Handle function returning an unconstrained type |
| |
| if Comes_From_Source (Body_Id) |
| and then Ekind (Spec_Id) = E_Function |
| and then Returns_Unconstrained_Type (Spec_Id) |
| |
| -- If function builds in place, i.e. returns a limited type, |
| -- inlining cannot be done. |
| |
| and then not Is_Limited_Type (Etype (Spec_Id)) |
| then |
| Check_And_Split_Unconstrained_Function (N, Spec_Id, Body_Id); |
| |
| else |
| declare |
| Subp_Body : constant Node_Id := |
| Unit_Declaration_Node (Body_Id); |
| Subp_Decl : constant List_Id := Declarations (Subp_Body); |
| |
| begin |
| -- Do not pass inlining to the backend if the subprogram |
| -- has declarations or statements which cannot be inlined |
| -- by the backend. This check is done here to emit an |
| -- error instead of the generic warning message reported |
| -- by the GCC backend (ie. "function might not be |
| -- inlinable"). |
| |
| if Present (Subp_Decl) |
| and then Has_Excluded_Declaration (Spec_Id, Subp_Decl) |
| then |
| null; |
| |
| elsif Has_Excluded_Statement |
| (Spec_Id, |
| Statements |
| (Handled_Statement_Sequence (Subp_Body))) |
| then |
| null; |
| |
| -- If the backend inlining is available then at this |
| -- stage we only have to mark the subprogram as inlined. |
| -- The expander will take care of registering it in the |
| -- table of subprograms inlined by the backend a part of |
| -- processing calls to it (cf. Expand_Call) |
| |
| else |
| Set_Is_Inlined (Spec_Id); |
| end if; |
| end; |
| end if; |
| end if; |
| end if; |
| |
| -- In GNATprove mode, inline only when there is a separate subprogram |
| -- declaration for now, as inlining of subprogram bodies acting as |
| -- declarations, or subprogram stubs, are not supported by front-end |
| -- inlining. This inlining should occur after analysis of the body, so |
| -- that it is known whether the value of SPARK_Mode, which can be |
| -- defined by a pragma inside the body, is applicable to the body. |
| -- Inlining can be disabled with switch -gnatdm |
| |
| elsif GNATprove_Mode |
| and then Full_Analysis |
| and then not Inside_A_Generic |
| and then Present (Spec_Id) |
| and then |
| Nkind (Unit_Declaration_Node (Spec_Id)) = N_Subprogram_Declaration |
| and then Body_Has_SPARK_Mode_On |
| and then Can_Be_Inlined_In_GNATprove_Mode (Spec_Id, Body_Id) |
| and then not Body_Has_Contract |
| and then not Debug_Flag_M |
| then |
| Build_Body_To_Inline (N, Spec_Id); |
| end if; |
| |
| -- When generating code, inherited pre/postconditions are handled when |
| -- expanding the corresponding contract. |
| |
| -- Ada 2005 (AI-262): In library subprogram bodies, after the analysis |
| -- of the specification we have to install the private withed units. |
| -- This holds for child units as well. |
| |
| if Is_Compilation_Unit (Body_Id) |
| or else Nkind (Parent (N)) = N_Compilation_Unit |
| then |
| Install_Private_With_Clauses (Body_Id); |
| end if; |
| |
| Check_Anonymous_Return; |
| |
| -- Set the Protected_Formal field of each extra formal of the protected |
| -- subprogram to reference the corresponding extra formal of the |
| -- subprogram that implements it. For regular formals this occurs when |
| -- the protected subprogram's declaration is expanded, but the extra |
| -- formals don't get created until the subprogram is frozen. We need to |
| -- do this before analyzing the protected subprogram's body so that any |
| -- references to the original subprogram's extra formals will be changed |
| -- refer to the implementing subprogram's formals (see Expand_Formal). |
| |
| if Present (Spec_Id) |
| and then Is_Protected_Type (Scope (Spec_Id)) |
| and then Present (Protected_Body_Subprogram (Spec_Id)) |
| then |
| declare |
| Impl_Subp : constant Entity_Id := |
| Protected_Body_Subprogram (Spec_Id); |
| Prot_Ext_Formal : Entity_Id := Extra_Formals (Spec_Id); |
| Impl_Ext_Formal : Entity_Id := Extra_Formals (Impl_Subp); |
| |
| begin |
| while Present (Prot_Ext_Formal) loop |
| pragma Assert (Present (Impl_Ext_Formal)); |
| Set_Protected_Formal (Prot_Ext_Formal, Impl_Ext_Formal); |
| Next_Formal_With_Extras (Prot_Ext_Formal); |
| Next_Formal_With_Extras (Impl_Ext_Formal); |
| end loop; |
| end; |
| end if; |
| |
| -- Generate minimum accessibility local objects to correspond with |
| -- any extra formal added for anonymous access types. This new local |
| -- object can then be used instead of the formal in case it is used |
| -- in an actual to a call to a nested subprogram. |
| |
| -- This method is used to supplement our "small integer model" for |
| -- accessibility-check generation (for more information see |
| -- Dynamic_Accessibility_Level). |
| |
| -- Because we allow accessibility values greater than our expected value |
| -- passing along the same extra accessibility formal as an actual |
| -- to a nested subprogram becomes a problem because high values mean |
| -- different things to the callee even though they are the same to the |
| -- caller. So, as described in the first section, we create a local |
| -- object representing the minimum of the accessibility level value that |
| -- is passed in and the accessibility level of the callee's parameter |
| -- and locals and use it in the case of a call to a nested subprogram. |
| -- This generated object is refered to as a "minimum accessiblity |
| -- level." |
| |
| if Present (Spec_Id) or else Present (Body_Id) then |
| Body_Nod := Unit_Declaration_Node (Body_Id); |
| |
| declare |
| Form : Entity_Id; |
| begin |
| -- Grab the appropriate formal depending on whether there exists |
| -- an actual spec for the subprogram or whether we are dealing |
| -- with a protected subprogram. |
| |
| if Present (Spec_Id) then |
| if Present (Protected_Body_Subprogram (Spec_Id)) then |
| Form := First_Formal (Protected_Body_Subprogram (Spec_Id)); |
| else |
| Form := First_Formal (Spec_Id); |
| end if; |
| else |
| Form := First_Formal (Body_Id); |
| end if; |
| |
| -- Loop through formals if the subprogram is capable of accepting |
| -- a generated local object. If it is not then it is also not |
| -- capable of having local subprograms meaning it would not need |
| -- a minimum accessibility level object anyway. |
| |
| if Present (Body_Nod) |
| and then Has_Declarations (Body_Nod) |
| and then Nkind (Body_Nod) /= N_Package_Specification |
| then |
| while Present (Form) loop |
| |
| if Present (Extra_Accessibility (Form)) |
| and then No (Minimum_Accessibility (Form)) |
| then |
| -- Generate the minimum accessibility level object |
| |
| -- A60b : integer := integer'min(2, paramL); |
| |
| declare |
| Loc : constant Source_Ptr := Sloc (Body_Nod); |
| Obj_Node : constant Node_Id := |
| Make_Object_Declaration (Loc, |
| Defining_Identifier => |
| Make_Temporary |
| (Loc, 'A', Extra_Accessibility (Form)), |
| Object_Definition => New_Occurrence_Of |
| (Standard_Integer, Loc), |
| Expression => |
| Make_Attribute_Reference (Loc, |
| Prefix => New_Occurrence_Of |
| (Standard_Integer, Loc), |
| Attribute_Name => Name_Min, |
| Expressions => New_List ( |
| Make_Integer_Literal (Loc, |
| Object_Access_Level (Form)), |
| New_Occurrence_Of |
| (Extra_Accessibility (Form), Loc)))); |
| begin |
| -- Add the new local object to the Minimum_Acc_Obj to |
| -- be later prepended to the subprogram's list of |
| -- declarations after we are sure all expansion is |
| -- done. |
| |
| if Present (Minimum_Acc_Objs) then |
| Prepend (Obj_Node, Minimum_Acc_Objs); |
| else |
| Minimum_Acc_Objs := New_List (Obj_Node); |
| end if; |
| |
| -- Register the object and analyze it |
| |
| Set_Minimum_Accessibility |
| (Form, Defining_Identifier (Obj_Node)); |
| |
| Analyze (Obj_Node); |
| end; |
| end if; |
| |
| Next_Formal (Form); |
| end loop; |
| end if; |
| end; |
| end if; |
| |
| -- Now we can go on to analyze the body |
| |
| HSS := Handled_Statement_Sequence (N); |
| Set_Actual_Subtypes (N, Current_Scope); |
| |
| -- Add a declaration for the Protection object, renaming declarations |
| -- for discriminals and privals and finally a declaration for the entry |
| -- family index (if applicable). This form of early expansion is done |
| -- when the Expander is active because Install_Private_Data_Declarations |
| -- references entities which were created during regular expansion. The |
| -- subprogram entity must come from source, and not be an internally |
| -- generated subprogram. |
| |
| if Expander_Active |
| and then Present (Prot_Typ) |
| and then Present (Spec_Id) |
| and then Comes_From_Source (Spec_Id) |
| and then not Is_Eliminated (Spec_Id) |
| then |
| Install_Private_Data_Declarations |
| (Sloc (N), Spec_Id, Prot_Typ, N, Declarations (N)); |
| end if; |
| |
| -- Ada 2012 (AI05-0151): Incomplete types coming from a limited context |
| -- may now appear in parameter and result profiles. Since the analysis |
| -- of a subprogram body may use the parameter and result profile of the |
| -- spec, swap any limited views with their non-limited counterpart. |
| |
| if Ada_Version >= Ada_2012 and then Present (Spec_Id) then |
| Exch_Views := Exchange_Limited_Views (Spec_Id); |
| end if; |
| |
| -- If the return type is an anonymous access type whose designated type |
| -- is the limited view of a class-wide type and the non-limited view is |
| -- available, update the return type accordingly. |
| |
| if Ada_Version >= Ada_2005 and then Present (Spec_Id) then |
| declare |
| Etyp : Entity_Id; |
| Rtyp : Entity_Id; |
| |
| begin |
| Rtyp := Etype (Spec_Id); |
| |
| if Ekind (Rtyp) = E_Anonymous_Access_Type then |
| Etyp := Directly_Designated_Type (Rtyp); |
| |
| if Is_Class_Wide_Type (Etyp) |
| and then From_Limited_With (Etyp) |
| then |
| Desig_View := Etyp; |
| Set_Directly_Designated_Type (Rtyp, Available_View (Etyp)); |
| end if; |
| end if; |
| end; |
| end if; |
| |
| -- Analyze any aspect specifications that appear on the subprogram body |
| |
| if Has_Aspects (N) then |
| Analyze_Aspects_On_Subprogram_Body_Or_Stub (N); |
| end if; |
| |
| Analyze_Declarations (Declarations (N)); |
| |
| -- Verify that the SPARK_Mode of the body agrees with that of its spec |
| |
| if Present (Spec_Id) and then Present (SPARK_Pragma (Body_Id)) then |
| if Present (SPARK_Pragma (Spec_Id)) then |
| if Get_SPARK_Mode_From_Annotation (SPARK_Pragma (Spec_Id)) = Off |
| and then |
| Get_SPARK_Mode_From_Annotation (SPARK_Pragma (Body_Id)) = On |
| then |
| Error_Msg_Sloc := Sloc (SPARK_Pragma (Body_Id)); |
| Error_Msg_N ("incorrect application of SPARK_Mode#", N); |
| Error_Msg_Sloc := Sloc (SPARK_Pragma (Spec_Id)); |
| Error_Msg_NE |
| ("\value Off was set for SPARK_Mode on & #", N, Spec_Id); |
| end if; |
| |
| elsif Nkind (Parent (Parent (Spec_Id))) = N_Subprogram_Body_Stub then |
| null; |
| |
| else |
| Error_Msg_Sloc := Sloc (SPARK_Pragma (Body_Id)); |
| Error_Msg_N ("incorrect application of SPARK_Mode #", N); |
| Error_Msg_Sloc := Sloc (Spec_Id); |
| Error_Msg_NE |
| ("\no value was set for SPARK_Mode on & #", N, Spec_Id); |
| end if; |
| end if; |
| |
| -- A subprogram body freezes its own contract. Analyze the contract |
| -- after the declarations of the body have been processed as pragmas |
| -- are now chained on the contract of the subprogram body. |
| |
| Analyze_Entry_Or_Subprogram_Body_Contract (Body_Id); |
| |
| -- Check completion, and analyze the statements |
| |
| Check_Completion; |
| Inspect_Deferred_Constant_Completion (Declarations (N)); |
| Analyze (HSS); |
| |
| -- Add the generated minimum accessibility objects to the subprogram |
| -- body's list of declarations after analysis of the statements and |
| -- contracts. |
| |
| while Is_Non_Empty_List (Minimum_Acc_Objs) loop |
| if Present (Declarations (Body_Nod)) then |
| Prepend (Remove_Head (Minimum_Acc_Objs), Declarations (Body_Nod)); |
| else |
| Set_Declarations |
| (Body_Nod, New_List (Remove_Head (Minimum_Acc_Objs))); |
| end if; |
| end loop; |
| |
| -- Deal with end of scope processing for the body |
| |
| Process_End_Label (HSS, 't', Current_Scope); |
| Update_Use_Clause_Chain; |
| End_Scope; |
| |
| -- If we are compiling an entry wrapper, remove the enclosing |
| -- synchronized object from the stack. |
| |
| if Is_Entry_Wrapper (Body_Id) then |
| End_Scope; |
| end if; |
| |
| Check_Subprogram_Order (N); |
| Set_Analyzed (Body_Id); |
| |
| -- If we have a separate spec, then the analysis of the declarations |
| -- caused the entities in the body to be chained to the spec id, but |
| -- we want them chained to the body id. Only the formal parameters |
| -- end up chained to the spec id in this case. |
| |
| if Present (Spec_Id) then |
| |
| -- We must conform to the categorization of our spec |
| |
| Validate_Categorization_Dependency (N, Spec_Id); |
| |
| -- And if this is a child unit, the parent units must conform |
| |
| if Is_Child_Unit (Spec_Id) then |
| Validate_Categorization_Dependency |
| (Unit_Declaration_Node (Spec_Id), Spec_Id); |
| end if; |
| |
| -- Here is where we move entities from the spec to the body |
| |
| -- Case where there are entities that stay with the spec |
| |
| if Present (Last_Real_Spec_Entity) then |
| |
| -- No body entities (happens when the only real spec entities come |
| -- from precondition and postcondition pragmas). |
| |
| if No (Last_Entity (Body_Id)) then |
| Set_First_Entity (Body_Id, Next_Entity (Last_Real_Spec_Entity)); |
| |
| -- Body entities present (formals), so chain stuff past them |
| |
| else |
| Link_Entities |
| (Last_Entity (Body_Id), Next_Entity (Last_Real_Spec_Entity)); |
| end if; |
| |
| Set_Next_Entity (Last_Real_Spec_Entity, Empty); |
| Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); |
| Set_Last_Entity (Spec_Id, Last_Real_Spec_Entity); |
| |
| -- Case where there are no spec entities, in this case there can be |
| -- no body entities either, so just move everything. |
| |
| -- If the body is generated for an expression function, it may have |
| -- been preanalyzed already, if 'access was applied to it. |
| |
| else |
| if Nkind (Original_Node (Unit_Declaration_Node (Spec_Id))) /= |
| N_Expression_Function |
| then |
| pragma Assert (No (Last_Entity (Body_Id))); |
| null; |
| end if; |
| |
| Set_First_Entity (Body_Id, First_Entity (Spec_Id)); |
| Set_Last_Entity (Body_Id, Last_Entity (Spec_Id)); |
| Set_First_Entity (Spec_Id, Empty); |
| Set_Last_Entity (Spec_Id, Empty); |
| end if; |
| |
| -- Otherwise the body does not complete a previous declaration. Check |
| -- the categorization of the body against the units it withs. |
| |
| else |
| Validate_Categorization_Dependency (N, Body_Id); |
| end if; |
| |
| Check_Missing_Return; |
| |
| -- Now we are going to check for variables that are never modified in |
| -- the body of the procedure. But first we deal with a special case |
| -- where we want to modify this check. If the body of the subprogram |
| -- starts with a raise statement or its equivalent, or if the body |
| -- consists entirely of a null statement, then it is pretty obvious that |
| -- it is OK to not reference the parameters. For example, this might be |
| -- the following common idiom for a stubbed function: statement of the |
| -- procedure raises an exception. In particular this deals with the |
| -- common idiom of a stubbed function, which appears something like: |
| |
| -- function F (A : Integer) return Some_Type; |
| -- X : Some_Type; |
| -- begin |
| -- raise Program_Error; |
| -- return X; |
| -- end F; |
| |
| -- Here the purpose of X is simply to satisfy the annoying requirement |
| -- in Ada that there be at least one return, and we certainly do not |
| -- want to go posting warnings on X that it is not initialized. On |
| -- the other hand, if X is entirely unreferenced that should still |
| -- get a warning. |
| |
| -- What we do is to detect these cases, and if we find them, flag the |
| -- subprogram as being Is_Trivial_Subprogram and then use that flag to |
| -- suppress unwanted warnings. For the case of the function stub above |
| -- we have a special test to set X as apparently assigned to suppress |
| -- the warning. |
| |
| declare |
| Stm : Node_Id; |
| |
| begin |
| -- Skip call markers installed by the ABE mechanism, labels, and |
| -- Push_xxx_Error_Label to find the first real statement. |
| |
| Stm := First (Statements (HSS)); |
| while Nkind_In (Stm, N_Call_Marker, N_Label) |
| or else Nkind (Stm) in N_Push_xxx_Label |
| loop |
| Next (Stm); |
| end loop; |
| |
| -- Do the test on the original statement before expansion |
| |
| declare |
| Ostm : constant Node_Id := Original_Node (Stm); |
| |
| begin |
| -- If explicit raise statement, turn on flag |
| |
| if Nkind (Ostm) = N_Raise_Statement then |
| Set_Trivial_Subprogram (Stm); |
| |
| -- If null statement, and no following statements, turn on flag |
| |
| elsif Nkind (Stm) = N_Null_Statement |
| and then Comes_From_Source (Stm) |
| and then No (Next (Stm)) |
| then |
| Set_Trivial_Subprogram (Stm); |
| |
| -- Check for explicit call cases which likely raise an exception |
| |
| elsif Nkind (Ostm) = N_Procedure_Call_Statement then |
| if Is_Entity_Name (Name (Ostm)) then |
| declare |
| Ent : constant Entity_Id := Entity (Name (Ostm)); |
| |
| begin |
| -- If the procedure is marked No_Return, then likely it |
| -- raises an exception, but in any case it is not coming |
| -- back here, so turn on the flag. |
| |
| if Present (Ent) |
| and then Ekind (Ent) = E_Procedure |
| and then No_Return (Ent) |
| then |
| Set_Trivial_Subprogram (Stm); |
| end if; |
| end; |
| end if; |
| end if; |
| end; |
| end; |
| |
| -- Check for variables that are never modified |
| |
| declare |
| E1 : Entity_Id; |
| E2 : Entity_Id; |
| |
| begin |
| -- If there is a separate spec, then transfer Never_Set_In_Source |
| -- flags from out parameters to the corresponding entities in the |
| -- body. The reason we do that is we want to post error flags on |
| -- the body entities, not the spec entities. |
| |
| if Present (Spec_Id) then |
| E1 := First_Entity (Spec_Id); |
| while Present (E1) loop |
| if Ekind (E1) = E_Out_Parameter then |
| E2 := First_Entity (Body_Id); |
| while Present (E2) loop |
| exit when Chars (E1) = Chars (E2); |
| Next_Entity (E2); |
| end loop; |
| |
| if Present (E2) then |
| Set_Never_Set_In_Source (E2, Never_Set_In_Source (E1)); |
| end if; |
| end if; |
| |
| Next_Entity (E1); |
| end loop; |
| end if; |
| |
| -- Check references of the subprogram spec when we are dealing with |
| -- an expression function due to it having a generated body. |
| -- Otherwise, we simply check the formals of the subprogram body. |
| |
| if Present (Spec_Id) |
| and then Is_Expression_Function (Spec_Id) |
| then |
| Check_References (Spec_Id); |
| else |
| Check_References (Body_Id); |
| end if; |
| end; |
| |
| -- Check for nested subprogram, and mark outer level subprogram if so |
| |
| declare |
| Ent : Entity_Id; |
| |
| begin |
| if Present (Spec_Id) then |
| Ent := Spec_Id; |
| else |
| Ent := Body_Id; |
| end if; |
| |
| loop |
| Ent := Enclosing_Subprogram (Ent); |
| exit when No (Ent) or else Is_Subprogram (Ent); |
| end loop; |
| |
| if Present (Ent) then |
| Set_Has_Nested_Subprogram (Ent); |
| end if; |
| end; |
| |
| -- Restore the limited views in the spec, if any, to let the back end |
| -- process it without running into circularities. |
| |
| if Exch_Views /= No_Elist then |
| Restore_Limited_Views (Exch_Views); |
| end if; |
| |
| if Mask_Types /= No_Elist then |
| Unmask_Unfrozen_Types (Mask_Types); |
| end if; |
| |
| if Present (Desig_View) then |
| Set_Directly_Designated_Type (Etype (Spec_Id), Desig_View); |
| end if; |
| |
| <<Leave>> |
| if Present (Ignored_Ghost_Region) then |
| Expander_Active := Saved_EA; |
| end if; |
| |
| Ignore_SPARK_Mode_Pragmas_In_Instance := Saved_ISMP; |
| Restore_Ghost_Region (Saved_GM, Saved_IGR); |
| end Analyze_Subprogram_Body_Helper; |
| |
| ------------------------------------ |
| -- Analyze_Subprogram_Declaration -- |
| ------------------------------------ |
| |
| procedure Analyze_Subprogram_Declaration (N : Node_Id) is |
| Scop : constant Entity_Id := Current_Scope; |
| Designator : Entity_Id; |
| |
| Is_Completion : Boolean; |
| -- Indicates whether a null procedure declaration is a completion |
| |
| begin |
| -- Null procedures are not allowed in SPARK |
| |
| if Nkind (Specification (N)) = N_Procedure_Specification |
| and then Null_Present (Specification (N)) |
| then |
| Check_SPARK_05_Restriction ("null procedure is not allowed", N); |
| |
| -- Null procedures are allowed in protected types, following the |
| -- recent AI12-0147. |
| |
| if Is_Protected_Type (Current_Scope) |
| and then Ada_Version < Ada_2012 |
| then |
| Error_Msg_N ("protected operation cannot be a null procedure", N); |
| end if; |
| |
| Analyze_Null_Procedure (N, Is_Completion); |
| |
| -- The null procedure acts as a body, nothing further is needed |
| |
| if Is_Completion then |
| return; |
| end if; |
| end if; |
| |
| Designator := Analyze_Subprogram_Specification (Specification (N)); |
| |
| -- A reference may already have been generated for the unit name, in |
| -- which case the following call is redundant. However it is needed for |
| -- declarations that are the rewriting of an expression function. |
| |
| Generate_Definition (Designator); |
| |
| -- Set the SPARK mode from the current context (may be overwritten later |
| -- with explicit pragma). This is not done for entry barrier functions |
| -- because they are generated outside the protected type and should not |
| -- carry the mode of the enclosing context. |
| |
| if Nkind (N) = N_Subprogram_Declaration |
| and then Is_Entry_Barrier_Function (N) |
| then |
| null; |
| |
| else |
| Set_SPARK_Pragma (Designator, SPARK_Mode_Pragma); |
| Set_SPARK_Pragma_Inherited (Designator); |
| end if; |
| |
| -- Save the state of flag Ignore_SPARK_Mode_Pragmas_In_Instance in case |
| -- the body of this subprogram is instantiated or inlined later and out |
| -- of context. The body uses this attribute to restore the value of the |
| -- global flag. |
| |
| if Ignore_SPARK_Mode_Pragmas_In_Instance then |
| Set_Ignore_SPARK_Mode_Pragmas (Designator); |
| end if; |
| |
| -- Preserve relevant elaboration-related attributes of the context which |
| -- are no longer available or very expensive to recompute once analysis, |
| -- resolution, and expansion are over. |
| |
| Mark_Elaboration_Attributes |
| (N_Id => Designator, |
| Checks => True, |
| Warnings => True); |
| |
| if Debug_Flag_C then |
| Write_Str ("==> subprogram spec "); |
| Write_Name (Chars (Designator)); |
| Write_Str (" from "); |
| Write_Location (Sloc (N)); |
| Write_Eol; |
| Indent; |
| end if; |
| |
| Validate_RCI_Subprogram_Declaration (N); |
| New_Overloaded_Entity (Designator); |
| Check_Delayed_Subprogram (Designator); |
| |
| -- If the type of the first formal of the current subprogram is a non- |
| -- generic tagged private type, mark the subprogram as being a private |
| -- primitive. Ditto if this is a function with controlling result, and |
| -- the return type is currently private. In both cases, the type of the |
| -- controlling argument or result must be in the current scope for the |
| -- operation to be primitive. |
| |
| if Has_Controlling_Result (Designator) |
| and then Is_Private_Type (Etype (Designator)) |
| and then Scope (Etype (Designator)) = Current_Scope |
| and then not Is_Generic_Actual_Type (Etype (Designator)) |
| then |
| Set_Is_Private_Primitive (Designator); |
| |
| elsif Present (First_Formal (Designator)) then |
| declare |
| Formal_Typ : constant Entity_Id := |
| Etype (First_Formal (Designator)); |
| begin |
| Set_Is_Private_Primitive (Designator, |
| Is_Tagged_Type (Formal_Typ) |
| and then Scope (Formal_Typ) = Current_Scope |
| and then Is_Private_Type (Formal_Typ) |
| and then not Is_Generic_Actual_Type (Formal_Typ)); |
| end; |
| end if; |
| |
| -- Ada 2005 (AI-251): Abstract interface primitives must be abstract |
| -- or null. |
| |
| if Ada_Version >= Ada_2005 |
| and then Comes_From_Source (N) |
| and then Is_Dispatching_Operation (Designator) |
| then |
| declare |
| E : Entity_Id; |
| Etyp : Entity_Id; |
| |
| begin |
| if Has_Controlling_Result (Designator) then |
| Etyp := Etype (Designator); |
| |
| else |
| E := First_Entity (Designator); |
| while Present (E) |
| and then Is_Formal (E) |
| and then not Is_Controlling_Formal (E) |
| loop |
| Next_Entity (E); |
| end loop; |
| |
| Etyp := Etype (E); |
| end if; |
| |
| if Is_Access_Type (Etyp) then |
| Etyp := Directly_Designated_Type (Etyp); |
| end if; |
| |
| if Is_Interface (Etyp) |
| and then not Is_Abstract_Subprogram (Designator) |
| and then not (Ekind (Designator) = E_Procedure |
| and then Null_Present (Specification (N))) |
| then |
| Error_Msg_Name_1 := Chars (Defining_Entity (N)); |
| |
| -- Specialize error message based on procedures vs. functions, |
| -- since functions can't be null subprograms. |
| |
| if Ekind (Designator) = E_Procedure then |
| Error_Msg_N |
| ("interface procedure % must be abstract or null", N); |
| else |
| Error_Msg_N |
| ("interface function % must be abstract", N); |
| end if; |
| end if; |
| end; |
| end if; |
| |
| -- What is the following code for, it used to be |
| |
| -- ??? Set_Suppress_Elaboration_Checks |
| -- ??? (Designator, Elaboration_Checks_Suppressed (Designator)); |
| |
| -- The following seems equivalent, but a bit dubious |
| |
| if Elaboration_Checks_Suppressed (Designator) then |
| Set_Kill_Elaboration_Checks (Designator); |
| end if; |
| |
| -- For a compilation unit, set body required. This flag will only be |
| -- reset if a valid Import or Interface pragma is processed later on. |
| |
| if Nkind (Parent (N)) = N_Compilation_Unit then |
| Set_Body_Required (Parent (N), True); |
| |
| if Ada_Version >= Ada_2005 |
| and then Nkind (Specification (N)) = N_Procedure_Specification |
| and then Null_Present (Specification (N)) |
| then |
| Error_Msg_N |
| ("null procedure cannot be declared at library level", N); |
| end if; |
| end if; |
| |
| Generate_Reference_To_Formals (Designator); |
| Check_Eliminated (Designator); |
| |
| if Debug_Flag_C then |
| Outdent; |
| Write_Str ("<== subprogram spec "); |
| Write_Name (Chars (Designator)); |
| Write_Str (" from "); |
| Write_Location (Sloc (N)); |
| Write_Eol; |
| end if; |
| |
| -- Indicate that this is a protected operation, because it may be used |
| -- in subsequent declarations within the protected type. |
| |
| if Is_Protected_Type (Current_Scope) then |
| Set_Convention (Designator, Convention_Protected); |
| end if; |
| |
| List_Inherited_Pre_Post_Aspects (Designator); |
| |
| -- Process the aspects before establishing the proper categorization in |
| -- case the subprogram is a compilation unit and one of its aspects is |
| -- converted into a categorization pragma. |
| |
| if Has_Aspects (N) then |
| Analyze_Aspect_Specifications (N, Designator); |
| end if; |
| |
| if Scop /= Standard_Standard and then not Is_Child_Unit (Designator) then |
| Set_Categorization_From_Scope (Designator, Scop); |
| |
| -- Otherwise the unit is a compilation unit and/or a child unit. Set the |
| -- proper categorization of the unit based on its pragmas. |
| |
| else |
| Push_Scope (Designator); |
| Set_Categorization_From_Pragmas (N); |
| Validate_Categorization_Dependency (N, Designator); |
| Pop_Scope; |
| end if; |
| end Analyze_Subprogram_Declaration; |
| |
| -------------------------------------- |
| -- Analyze_Subprogram_Specification -- |
| -------------------------------------- |
| |
| -- Reminder: N here really is a subprogram specification (not a subprogram |
| -- declaration). This procedure is called to analyze the specification in |
| -- both subprogram bodies and subprogram declarations (specs). |
| |
| function Analyze_Subprogram_Specification (N : Node_Id) return Entity_Id is |
| function Is_Invariant_Procedure_Or_Body (E : Entity_Id) return Boolean; |
| -- Determine whether entity E denotes the spec or body of an invariant |
| -- procedure. |
| |
| ------------------------------------ |
| -- Is_Invariant_Procedure_Or_Body -- |
| ------------------------------------ |
| |
| function Is_Invariant_Procedure_Or_Body (E : Entity_Id) return Boolean is |
| Decl : constant Node_Id := Unit_Declaration_Node (E); |
| Spec : Entity_Id; |
| |
| begin |
| if Nkind (Decl) = N_Subprogram_Body then |
| Spec := Corresponding_Spec (Decl); |
| else |
| Spec := E; |
| end if; |
| |
| return |
| Present (Spec) |
| and then Ekind (Spec) = E_Procedure |
| and then (Is_Partial_Invariant_Procedure (Spec) |
| or else Is_Invariant_Procedure (Spec)); |
| end Is_Invariant_Procedure_Or_Body; |
| |
| -- Local variables |
| |
| Designator : constant Entity_Id := Defining_Entity (N); |
| Formals : constant List_Id := Parameter_Specifications (N); |
| |
| -- Start of processing for Analyze_Subprogram_Specification |
| |
| begin |
| -- User-defined operator is not allowed in SPARK, except as a renaming |
| |
| if Nkind (Defining_Unit_Name (N)) = N_Defining_Operator_Symbol |
| and then Nkind (Parent (N)) /= N_Subprogram_Renaming_Declaration |
| then |
| Check_SPARK_05_Restriction |
| ("user-defined operator is not allowed", N); |
| end if; |
| |
| -- Proceed with analysis. Do not emit a cross-reference entry if the |
| -- specification comes from an expression function, because it may be |
| -- the completion of a previous declaration. If it is not, the cross- |
| -- reference entry will be emitted for the new subprogram declaration. |
| |
| if Nkind (Parent (N)) /= N_Expression_Function then |
| Generate_Definition (Designator); |
| end if; |
| |
| if Nkind (N) = N_Function_Specification then |
| Set_Ekind (Designator, E_Function); |
| Set_Mechanism (Designator, Default_Mechanism); |
| else |
| Set_Ekind (Designator, E_Procedure); |
| Set_Etype (Designator, Standard_Void_Type); |
| end if; |
| |
| -- Flag Is_Inlined_Always is True by default, and reversed to False for |
| -- those subprograms which could be inlined in GNATprove mode (because |
| -- Body_To_Inline is non-Empty) but should not be inlined. |
| |
| if GNATprove_Mode then |
| Set_Is_Inlined_Always (Designator); |
| end if; |
| |
| -- Introduce new scope for analysis of the formals and the return type |
| |
| Set_Scope (Designator, Current_Scope); |
| |
| if Present (Formals) then |
| Push_Scope (Designator); |
| Process_Formals (Formals, N); |
| |
| -- Check dimensions in N for formals with default expression |
| |
| Analyze_Dimension_Formals (N, Formals); |
| |
| -- Ada 2005 (AI-345): If this is an overriding operation of an |
| -- inherited interface operation, and the controlling type is |
| -- a synchronized type, replace the type with its corresponding |
| -- record, to match the proper signature of an overriding operation. |
| -- Same processing for an access parameter whose designated type is |
| -- derived from a synchronized interface. |
| |
| -- This modification is not done for invariant procedures because |
| -- the corresponding record may not necessarely be visible when the |
| -- concurrent type acts as the full view of a private type. |
| |
| -- package Pack is |
| -- type Prot is private with Type_Invariant => ...; |
| -- procedure ConcInvariant (Obj : Prot); |
| -- private |
| -- protected type Prot is ...; |
| -- type Concurrent_Record_Prot is record ...; |
| -- procedure ConcInvariant (Obj : Prot) is |
| -- ... |
| -- end ConcInvariant; |
| -- end Pack; |
| |
| -- In the example above, both the spec and body of the invariant |
| -- procedure must utilize the private type as the controlling type. |
| |
| if Ada_Version >= Ada_2005 |
| and then not Is_Invariant_Procedure_Or_Body (Designator) |
| then |
| declare |
| Formal : Entity_Id; |
| Formal_Typ : Entity_Id; |
| Rec_Typ : Entity_Id; |
| Desig_Typ : Entity_Id; |
| |
| begin |
| Formal := First_Formal (Designator); |
| while Present (Formal) loop |
| Formal_Typ := Etype (Formal); |
| |
| if Is_Concurrent_Type (Formal_Typ) |
| and then Present (Corresponding_Record_Type (Formal_Typ)) |
| then |
| Rec_Typ := Corresponding_Record_Type (Formal_Typ); |
| |
| if Present (Interfaces (Rec_Typ)) then |
| Set_Etype (Formal, Rec_Typ); |
| end if; |
| |
| elsif Ekind (Formal_Typ) = E_Anonymous_Access_Type then |
| Desig_Typ := Designated_Type (Formal_Typ); |
| |
| if Is_Concurrent_Type (Desig_Typ) |
| and then Present (Corresponding_Record_Type (Desig_Typ)) |
| then |
| Rec_Typ := Corresponding_Record_Type (Desig_Typ); |
| |
| if Present (Interfaces (Rec_Typ)) then |
| Set_Directly_Designated_Type (Formal_Typ, Rec_Typ); |
| end if; |
| end if; |
| end if; |
| |
| Next_Formal (Formal); |
| end loop; |
| end; |
| end if; |
| |
| End_Scope; |
| |
| -- The subprogram scope is pushed and popped around the processing of |
| -- the return type for consistency with call above to Process_Formals |
| -- (which itself can call Analyze_Return_Type), and to ensure that any |
| -- itype created for the return type will be associated with the proper |
| -- scope. |
| |
| elsif Nkind (N) = N_Function_Specification then |
| Push_Scope (Designator); |
| Analyze_Return_Type (N); |
| End_Scope; |
| end if; |
| |
| -- Function case |
| |
| if Nkind (N) = N_Function_Specification then |
| |
| -- Deal with operator symbol case |
| |
| if Nkind (Designator) = N_Defining_Operator_Symbol then |
| Valid_Operator_Definition (Designator); |
| end if; |
| |
| May_Need_Actuals (Designator); |
| |
| -- Ada 2005 (AI-251): If the return type is abstract, verify that |
| -- the subprogram is abstract also. This does not apply to renaming |
| -- declarations, where abstractness is inherited, and to subprogram |
| -- bodies generated for stream operations, which become renamings as |
| -- bodies. |
| |
| -- In case of primitives associated with abstract interface types |
| -- the check is applied later (see Analyze_Subprogram_Declaration). |
| |
| if not Nkind_In (Original_Node (Parent (N)), |
| N_Abstract_Subprogram_Declaration, |
| N_Formal_Abstract_Subprogram_Declaration, |
| N_Subprogram_Renaming_Declaration) |
| then |
| if Is_Abstract_Type (Etype (Designator)) |
| and then not Is_Interface (Etype (Designator)) |
| then |
| Error_Msg_N |
| ("function that returns abstract type must be abstract", N); |
| |
| -- Ada 2012 (AI-0073): Extend this test to subprograms with an |
| -- access result whose designated type is abstract. |
| |
| elsif Ada_Version >= Ada_2012 |
| and then Nkind (Result_Definition (N)) = N_Access_Definition |
| and then |
| not Is_Class_Wide_Type (Designated_Type (Etype (Designator))) |
| and then Is_Abstract_Type (Designated_Type (Etype (Designator))) |
| then |
| Error_Msg_N |
| ("function whose access result designates abstract type " |
| & "must be abstract", N); |
| end if; |
| end if; |
| end if; |
| |
| return Designator; |
| end Analyze_Subprogram_Specification; |
| |
| ----------------------- |
| -- Check_Conformance -- |
| ----------------------- |
| |
| procedure Check_Conformance |
| (New_Id : Entity_Id; |
| Old_Id : Entity_Id; |
| Ctype : Conformance_Type; |
| Errmsg : Boolean; |
| Conforms : out Boolean; |
| Err_Loc : Node_Id := Empty; |
| Get_Inst : Boolean := False; |
| Skip_Controlling_Formals : Boolean := False) |
| is |
| procedure Conformance_Error (Msg : String; N : Node_Id := New_Id); |
| -- Sets Conforms to False. If Errmsg is False, then that's all it does. |
| -- If Errmsg is True, then processing continues to post an error message |
| -- for conformance error on given node. Two messages are output. The |
| -- first message points to the previous declaration with a general "no |
| -- conformance" message. The second is the detailed reason, supplied as |
| -- Msg. The parameter N provide information for a possible & insertion |
| -- in the message, and also provides the location for posting the |
| -- message in the absence of a specified Err_Loc location. |
| |
| function Conventions_Match |
| (Id1 : Entity_Id; |
| Id2 : Entity_Id) return Boolean; |
| -- Determine whether the conventions of arbitrary entities Id1 and Id2 |
| -- match. |
| |
| ----------------------- |
| -- Conformance_Error -- |
| ----------------------- |
| |
| procedure Conformance_Error (Msg : String; N : Node_Id := New_Id) is |
| Enode : Node_Id; |
| |
| begin |
| Conforms := False; |
| |
| if Errmsg then |
| if No (Err_Loc) then |
| Enode := N; |
| else |
| Enode := Err_Loc; |
| end if; |
| |
| Error_Msg_Sloc := Sloc (Old_Id); |
| |
| case Ctype is |
| when Type_Conformant => |
| Error_Msg_N -- CODEFIX |
| ("not type conformant with declaration#!", Enode); |
| |
| when Mode_Conformant => |
| if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
| Error_Msg_N |
| ("not mode conformant with operation inherited#!", |
| Enode); |
| else |
| Error_Msg_N |
| ("not mode conformant with declaration#!", Enode); |
| end if; |
| |
| when Subtype_Conformant => |
| if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
| Error_Msg_N |
| ("not subtype conformant with operation inherited#!", |
| Enode); |
| else |
| Error_Msg_N |
| ("not subtype conformant with declaration#!", Enode); |
| end if; |
| |
| when Fully_Conformant => |
| if Nkind (Parent (Old_Id)) = N_Full_Type_Declaration then |
| Error_Msg_N -- CODEFIX |
| ("not fully conformant with operation inherited#!", |
| Enode); |
| else |
| Error_Msg_N -- CODEFIX |
| ("not fully conformant with declaration#!", Enode); |
| end if; |
| end case; |
| |
| Error_Msg_NE (Msg, Enode, N); |
| end if; |
| end Conformance_Error; |
| |
| ----------------------- |
| -- Conventions_Match -- |
| ----------------------- |
| |
| function Conventions_Match |
| (Id1 : Entity_Id; |
| Id2 : Entity_Id) return Boolean |
| is |
| begin |
| -- Ignore the conventions of anonymous access-to-subprogram types |
| -- and subprogram types because these are internally generated and |
| -- the only way these may receive a convention is if they inherit |
| -- the convention of a related subprogram. |
| |
| if Ekind_In (Id1, E_Anonymous_Access_Subprogram_Type, |
| E_Subprogram_Type) |
| or else |
| Ekind_In (Id2, E_Anonymous_Access_Subprogram_Type, |
| E_Subprogram_Type) |
| then |
| return True; |
| |
| -- Otherwise compare the conventions directly |
| |
| else |
| return Convention (Id1) = Convention (Id2); |
| end if; |
| end Conventions_Match; |
| |
| -- Local Variables |
| |
| Old_Type : constant Entity_Id := Etype (Old_Id); |
| New_Type : constant Entity_Id := Etype (New_Id); |
| Old_Formal : Entity_Id; |
| New_Formal : Entity_Id; |
| Access_Types_Match : Boolean; |
| Old_Formal_Base : Entity_Id; |
| New_Formal_Base : Entity_Id; |
| |
| -- Start of processing for Check_Conformance |
| |
| begin |
| Conforms := True; |
| |
| -- We need a special case for operators, since they don't appear |
| -- explicitly. |
| |
| if Ctype = Type_Conformant then |
| if Ekind (New_Id) = E_Operator |
| and then Operator_Matches_Spec (New_Id, Old_Id) |
| then |
| return; |
| end if; |
| end if; |
| |
| -- If both are functions/operators, check return types conform |
| |
| if Old_Type /= Standard_Void_Type |
| and then |
| New_Type /= Standard_Void_Type |
| then |
| -- If we are checking interface conformance we omit controlling |
| -- arguments and result, because we are only checking the conformance |
| -- of the remaining parameters. |
| |
| if Has_Controlling_Result (Old_Id) |
| and then Has_Controlling_Result (New_Id) |
| and then Skip_Controlling_Formals |
| then |
| null; |
| |
| elsif not Conforming_Types (Old_Type, New_Type, Ctype, Get_Inst) then |
| if Ctype >= Subtype_Conformant |
| and then not Predicates_Match (Old_Type, New_Type) |
| then |
| Conformance_Error |
| ("\predicate of return type does not match!", New_Id); |
| else |
| Conformance_Error |
| ("\return type does not match!", New_Id); |
| end if; |
| |
| return; |
| end if; |
| |
| -- Ada 2005 (AI-231): In case of anonymous access types check the |
| -- null-exclusion and access-to-constant attributes match. |
| |
| if Ada_Version >= Ada_2005 |
| and then Ekind (Etype (Old_Type)) = E_Anonymous_Access_Type |
| and then |
| (Can_Never_Be_Null (Old_Type) /= Can_Never_Be_Null (New_Type) |
| or else Is_Access_Constant (Etype (Old_Type)) /= |
| Is_Access_Constant (Etype (New_Type))) |
| then |
| Conformance_Error ("\return type does not match!", New_Id); |
| return; |
| end if; |
| |
| -- If either is a function/operator and the other isn't, error |
| |
| elsif Old_Type /= Standard_Void_Type |
| or else New_Type /= Standard_Void_Type |
| then |
| Conformance_Error ("\functions can only match functions!", New_Id); |
| return; |
| end if; |
| |
| -- In subtype conformant case, conventions must match (RM 6.3.1(16)). |
| -- If this is a renaming as body, refine error message to indicate that |
| -- the conflict is with the original declaration. If the entity is not |
| -- frozen, the conventions don't have to match, the one of the renamed |
| -- entity is inherited. |
| |
| if Ctype >= Subtype_Conformant then |
| if not Conventions_Match (Old_Id, New_Id) then |
| if not Is_Frozen (New_Id) then |
| null; |
| |
| elsif Present (Err_Loc) |
| and then Nkind (Err_Loc) = N_Subprogram_Renaming_Declaration |
| and then Present (Corresponding_Spec (Err_Loc)) |
| then |
| Error_Msg_Name_1 := Chars (New_Id); |
| Error_Msg_Name_2 := |
| Name_Ada + Convention_Id'Pos (Convention (New_Id)); |
| Conformance_Error ("\prior declaration for% has convention %!"); |
| |
| else |
| Conformance_Error ("\calling conventions do not match!"); |
| end if; |
| |
| return; |
| |
| elsif Is_Formal_Subprogram (Old_Id) |
| or else Is_Formal_Subprogram (New_Id) |
| or else (Is_Subprogram (New_Id) |
| and then Present (Alias (New_Id)) |
| and then Is_Formal_Subprogram (Alias (New_Id))) |
| then |
| Conformance_Error |
| ("\formal subprograms are not subtype conformant " |
| & "(RM 6.3.1 (17/3))"); |
| end if; |
| end if; |
| |
| -- Deal with parameters |
| |
| -- Note: we use the entity information, rather than going directly |
| -- to the specification in the tree. This is not only simpler, but |
| -- absolutely necessary for some cases of conformance tests between |
| -- operators, where the declaration tree simply does not exist. |
| |
| Old_Formal := First_Formal (Old_Id); |
| New_Formal := First_Formal (New_Id); |
| while Present (Old_Formal) and then Present (New_Formal) loop |
| if Is_Controlling_Formal (Old_Formal) |
| and then Is_Controlling_Formal (New_Formal) |
| and then Skip_Controlling_Formals |
| then |
| -- The controlling formals will have different types when |
| -- comparing an interface operation with its match, but both |
| -- or neither must be access parameters. |
| |
| if Is_Access_Type (Etype (Old_Formal)) |
| = |
| Is_Access_Type (Etype (New_Formal)) |
| then |
| goto Skip_Controlling_Formal; |
| else |
| Conformance_Error |
| ("\access parameter does not match!", New_Formal); |
| end if; |
| end if; |
| |
| -- Ada 2012: Mode conformance also requires that formal parameters |
| -- be both aliased, or neither. |
| |
| if Ctype >= Mode_Conformant and then Ada_Version >= Ada_2012 then |
| if Is_Aliased (Old_Formal) /= Is_Aliased (New_Formal) then |
| Conformance_Error |
| ("\aliased parameter mismatch!", New_Formal); |
| end if; |
| end if; |
| |
| if Ctype = Fully_Conformant then |
| |
| -- Names must match. Error message is more accurate if we do |
| -- this before checking that the types of the formals match. |
| |
| if Chars (Old_Formal) /= Chars (New_Formal) then |
| Conformance_Error ("\name& does not match!", New_Formal); |
| |
| -- Set error posted flag on new formal as well to stop |
| -- junk cascaded messages in some cases. |
| |
| Set_Error_Posted (New_Formal); |
| return; |
| end if; |
| |
| -- Null exclusion must match |
| |
| if Null_Exclusion_Present (Parent (Old_Formal)) |
| /= |
| Null_Exclusion_Present (Parent (New_Formal)) |
| then |
| -- Only give error if both come from source. This should be |
| -- investigated some time, since it should not be needed ??? |
| |
| if Comes_From_Source (Old_Formal) |
| and then |
| Comes_From_Source (New_Formal) |
| then |
| Conformance_Error |
| ("\null exclusion for& does not match", New_Formal); |
| |
| -- Mark error posted on the new formal to avoid duplicated |
| -- complaint about types not matching. |
| |
| Set_Error_Posted (New_Formal); |
| end if; |
| end if; |
| end if; |
| |
| -- Ada 2005 (AI-423): Possible access [sub]type and itype match. This |
| -- case occurs whenever a subprogram is being renamed and one of its |
| -- parameters imposes a null exclusion. For example: |
| |
| -- type T is null record; |
| -- type Acc_T is access T; |
| -- subtype Acc_T_Sub is Acc_T; |
| |
| -- procedure P (Obj : not null Acc_T_Sub); -- itype |
| -- procedure Ren_P (Obj : Acc_T_Sub) -- subtype |
| -- renames P; |
| |
| Old_Formal_Base := Etype (Old_Formal); |
| New_Formal_Base := Etype (New_Formal); |
| |
| if Get_Inst then |
| Old_Formal_Base := Get_Instance_Of (Old_Formal_Base); |
| New_Formal_Base := Get_Instance_Of (New_Formal_Base); |
| end if; |
| |
| Access_Types_Match := Ada_Version >= Ada_2005 |
| |
| -- Ensure that this rule is only applied when New_Id is a |
| -- renaming of Old_Id. |
| |
| and then Nkind (Parent (Parent (New_Id))) = |
| N_Subprogram_Renaming_Declaration |
| and then Nkind (Name (Parent (Parent (New_Id)))) in N_Has_Entity |
| and then Present (Entity (Name (Parent (Parent (New_Id))))) |
| and then Entity (Name (Parent (Parent (New_Id)))) = Old_Id |
| |
| -- Now handle the allowed access-type case |
| |
| and then Is_Access_Type (Old_Formal_Base) |
| and then Is_Access_Type (New_Formal_Base) |
| |
| -- The type kinds must match. The only exception occurs with |
| -- multiple generics of the form: |
| |
| -- generic generic |
| -- type F is private; type A is private; |
| -- type F_Ptr is access F; type A_Ptr is access A; |
| -- with proc F_P (X : F_Ptr); with proc A_P (X : A_Ptr); |
| -- package F_Pack is ... package A_Pack is |
| -- package F_Inst is |
| -- new F_Pack (A, A_Ptr, A_P); |
| |
| -- When checking for conformance between the parameters of A_P |
| -- and F_P, the type kinds of F_Ptr and A_Ptr will not match |
| -- because the compiler has transformed A_Ptr into a subtype of |
| -- F_Ptr. We catch this case in the code below. |
| |
| and then (Ekind (Old_Formal_Base) = Ekind (New_Formal_Base) |
| or else |
| (Is_Generic_Type (Old_Formal_Base) |
| and then Is_Generic_Type (New_Formal_Base) |
| and then Is_Internal (New_Formal_Base) |
| and then Etype (Etype (New_Formal_Base)) = |
| Old_Formal_Base)) |
| and then Directly_Designated_Type (Old_Formal_Base) = |
| Directly_Designated_Type (New_Formal_Base) |
| and then ((Is_Itype (Old_Formal_Base) |
| and then (Can_Never_Be_Null (Old_Formal_Base) |
| or else Is_Access_Constant |
| (Old_Formal_Base))) |
| or else |
| (Is_Itype (New_Formal_Base) |
| and then (Can_Never_Be_Null (New_Formal_Base) |
| or else Is_Access_Constant |
| (New_Formal_Base)))); |
| |
| -- Types must always match. In the visible part of an instance, |
| -- usual overloading rules for dispatching operations apply, and |
| -- we check base types (not the actual subtypes). |
| |
| if In_Instance_Visible_Part |
| and then Is_Dispatching_Operation (New_Id) |
| then |
| if not Conforming_Types |
| (T1 => Base_Type (Etype (Old_Formal)), |
| T2 => Base_Type (Etype (New_Formal)), |
| Ctype => Ctype, |
| Get_Inst => Get_Inst) |
| and then not Access_Types_Match |
| then |
| Conformance_Error ("\type of & does not match!", New_Formal); |
| return; |
| end if; |
| |
| elsif not Conforming_Types |
| (T1 => Old_Formal_Base, |
| T2 => New_Formal_Base, |
| Ctype => Ctype, |
| Get_Inst => Get_Inst) |
| and then not Access_Types_Match |
| then |
| -- Don't give error message if old type is Any_Type. This test |
| -- avoids some cascaded errors, e.g. in case of a bad spec. |
| |
| if Errmsg and then Old_Formal_Base = Any_Type then |
| Conforms := False; |
| else |
| if Ctype >= Subtype_Conformant |
| and then |
| not Predicates_Match (Old_Formal_Base, New_Formal_Base) |
| then |
| Conformance_Error |
| ("\predicate of & does not match!", New_Formal); |
| else |
| Conformance_Error |
| ("\type of & does not match!", New_Formal); |
| |
| if not Dimensions_Match (Old_Formal_Base, New_Formal_Base) |
| then |
| Error_Msg_N ("\dimensions mismatch!", New_Formal); |
| end if; |
| end if; |
| end if; |
| |
| return; |
| end if; |
| |
| -- For mode conformance, mode must match |
| |
| if Ctype >= Mode_Conformant then |
| if Parameter_Mode (Old_Formal) /= Parameter_Mode (New_Formal) then |
| if not Ekind_In (New_Id, E_Function, E_Procedure) |
| or else not Is_Primitive_Wrapper (New_Id) |
| then |
| Conformance_Error ("\mode of & does not match!", New_Formal); |
| |
| else |
| declare |
| T : constant Entity_Id := Find_Dispatching_Type (New_Id); |
| begin |
| if Is_Protected_Type (Corresponding_Concurrent_Type (T)) |
| then |
| Error_Msg_PT (New_Id, Ultimate_Alias (Old_Id)); |
| else |
| Conformance_Error |
| ("\mode of & does not match!", New_Formal); |
| end if; |
| end; |
| end if; |
| |
| return; |
| |
| -- Part of mode conformance for access types is having the same |
| -- constant modifier. |
| |
| elsif Access_Types_Match |
| and then Is_Access_Constant (Old_Formal_Base) /= |
| Is_Access_Constant (New_Formal_Base) |
| then |
| Conformance_Error |
| ("\constant modifier does not match!", New_Formal); |
| return; |
| end if; |
| end if; |
| |
| if Ctype >= Subtype_Conformant then |
| |
| -- Ada 2005 (AI-231): In case of anonymous access types check |
| -- the null-exclusion and access-to-constant attributes must |
| -- match. For null exclusion, we test the types rather than the |
| -- formals themselves, since the attribute is only set reliably |
| -- on the formals in the Ada 95 case, and we exclude the case |
| -- where Old_Formal is marked as controlling, to avoid errors |
| -- when matching completing bodies with dispatching declarations |
| -- (access formals in the bodies aren't marked Can_Never_Be_Null). |
| |
| if Ada_Version >= Ada_2005 |
| and then Ekind (Etype (Old_Formal)) = E_Anonymous_Access_Type |
| and then Ekind (Etype (New_Formal)) = E_Anonymous_Access_Type |
| and then |
| ((Can_Never_Be_Null (Etype (Old_Formal)) /= |
| Can_Never_Be_Null (Etype (New_Formal)) |
| and then |
| not Is_Controlling_Formal (Old_Formal)) |
| or else |
| Is_Access_Constant (Etype (Old_Formal)) /= |
| Is_Access_Constant (Etype (New_Formal))) |
| |
| -- Do not complain if error already posted on New_Formal. This |
| -- avoids some redundant error messages. |
| |
| and then not Error_Posted (New_Formal) |
| then |
| -- It is allowed to omit the null-exclusion in case of stream |
| -- attribute subprograms. We recognize stream subprograms |
| -- through their TSS-generated suffix. |
| |
| declare |
| TSS_Name : constant TSS_Name_Type := Get_TSS_Name (New_Id); |
| |
| begin |
| if TSS_Name /= TSS_Stream_Read |
| and then TSS_Name /= TSS_Stream_Write |
| and then TSS_Name /= TSS_Stream_Input |
| and then TSS_Name /= TSS_Stream_Output |
| then |
| -- Here we have a definite conformance error. It is worth |
| -- special casing the error message for the case of a |
| -- controlling formal (which excludes null). |
| |
| if Is_Controlling_Formal (New_Formal) then |
| Error_Msg_Node_2 := Scope (New_Formal); |
| Conformance_Error |
| ("\controlling formal & of & excludes null, " |
| & "declaration must exclude null as well", |
| New_Formal); |
| |
| -- Normal case (couldn't we give more detail here???) |
| |
| else |
| Conformance_Error |
| ("\type of & does not match!", New_Formal); |
| end if; |
| |
| return; |
| end if; |
| end; |
| end if; |
| end if; |
| |
| -- Full conformance checks |
| |
| if Ctype = Fully_Conformant then |
| |
| -- We have checked already that names match |
| |
| if Parameter_Mode (Old_Formal) = E_In_Parameter then |
| |
| -- Check default expressions for in parameters |
| |
| declare |
| NewD : constant Boolean := |
| Present (Default_Value (New_Formal)); |
| OldD : constant Boolean := |
| Present (Default_Value (Old_Formal)); |
| begin |
| if NewD or OldD then |
| |
| -- The old default value has been analyzed because the |
| -- current full declaration will have frozen everything |
| -- before. The new default value has not been analyzed, |
| -- so analyze it now before we check for conformance. |
| |
| if NewD then |
| Push_Scope (New_Id); |
| Preanalyze_Spec_Expression |
| (Default_Value (New_Formal), Etype (New_Formal)); |
| End_Scope; |
| end if; |
| |
| if not (NewD and OldD) |
| or else not Fully_Conformant_Expressions |
| (Default_Value (Old_Formal), |
| Default_Value (New_Formal)) |
| then |
| Conformance_Error |
| ("\default expression for & does not match!", |
| New_Formal); |
| return; |
| end if; |
| end if; |
| end; |
| end if; |
| end if; |
| |
| -- A couple of special checks for Ada 83 mode. These checks are |
| -- skipped if either entity is an operator in package Standard, |
| -- or if either old or new instance is not from the source program. |
| |
| if Ada_Version = Ada_83 |
| and then Sloc (Old_Id) > Standard_Location |
| and then Sloc (New_Id) > Standard_Location |
| and then Comes_From_Source (Old_Id) |
| and then Comes_From_Source (New_Id) |
| then |
| declare |
| Old_Param : constant Node_Id := Declaration_Node (Old_Formal); |
| New_Param : constant Node_Id := Declaration_Node (New_Formal); |
| |
| begin |
| -- Explicit IN must be present or absent in both cases. This |
| -- test is required only in the full conformance case. |
| |
| if In_Present (Old_Param) /= In_Present (New_Param) |
| and then Ctype = Fully_Conformant |
| then |
| Conformance_Error |
| ("\(Ada 83) IN must appear in both declarations", |
| New_Formal); |
| return; |
| end if; |
| |
| -- Grouping (use of comma in param lists) must be the same |
| -- This is where we catch a misconformance like: |
| |
| -- A, B : Integer |
| -- A : Integer; B : Integer |
| |
| -- which are represented identically in the tree except |
| -- for the setting of the flags More_Ids and Prev_Ids. |
| |
| if More_Ids (Old_Param) /= More_Ids (New_Param) |
| or else Prev_Ids (Old_Param) /= Prev_Ids (New_Param) |
| then |
| Conformance_Error |
| ("\grouping of & does not match!", New_Formal); |
| return; |
| end if; |
| end; |
| end if; |
| |
| -- This label is required when skipping controlling formals |
| |
| <<Skip_Controlling_Formal>> |
| |
| Next_Formal (Old_Formal); |
| Next_Formal (New_Formal); |
| end loop; |
| |
| if Present (Old_Formal) then |
| Conformance_Error ("\too few parameters!"); |
| return; |
| |
| elsif Present (New_Formal) then |
| Conformance_Error ("\too many parameters!", New_Formal); |
| return; |
| end if; |
| end Check_Conformance; |
| |
| ----------------------- |
| -- Check_Conventions -- |
| ----------------------- |
| |
| procedure Check_Conventions (Typ : Entity_Id) is |
| Ifaces_List : Elist_Id; |
| |
| procedure Check_Convention (Op : Entity_Id); |
| -- Verify that the convention of inherited dispatching operation Op is |
| -- consistent among all subprograms it overrides. In order to minimize |
| -- the search, Search_From is utilized to designate a specific point in |
| -- the list rather than iterating over the whole list once more. |
| |
| ---------------------- |
| -- Check_Convention -- |
| ---------------------- |
| |
| procedure Check_Convention (Op : Entity_Id) is |
| Op_Conv : constant Convention_Id := Convention (Op); |
| Iface_Conv : Convention_Id; |
| Iface_Elmt : Elmt_Id; |
| Iface_Prim_Elmt : Elmt_Id; |
| Iface_Prim : Entity_Id; |
| |
| begin |
| Iface_Elmt := First_Elmt (Ifaces_List); |
| while Present (Iface_Elmt) loop |
| Iface_Prim_Elmt := |
| First_Elmt (Primitive_Operations (Node (Iface_Elmt))); |
| while Present (Iface_Prim_Elmt) loop |
| Iface_Prim := Node (Iface_Prim_Elmt); |
| Iface_Conv := Convention (Iface_Prim); |
| |
| if Is_Interface_Conformant (Typ, Iface_Prim, Op) |
| and then Iface_Conv /= Op_Conv |
| then |
| Error_Msg_N |
| ("inconsistent conventions in primitive operations", Typ); |
| |
| Error_Msg_Name_1 := Chars (Op); |
| Error_Msg_Name_2 := Get_Convention_Name (Op_Conv); |
| Error_Msg_Sloc := Sloc (Op); |
| |
| if Comes_From_Source (Op) or else No (Alias (Op)) then |
| if not Present (Overridden_Operation (Op)) then |
| Error_Msg_N ("\\primitive % defined #", Typ); |
| else |
| Error_Msg_N |
| ("\\overriding operation % with " |
| & "convention % defined #", Typ); |
| end if; |
| |
| else pragma Assert (Present (Alias (Op))); |
| Error_Msg_Sloc := Sloc (Alias (Op)); |
| Error_Msg_N ("\\inherited operation % with " |
| & "convention % defined #", Typ); |
| end if; |
| |
| Error_Msg_Name_1 := Chars (Op); |
| Error_Msg_Name_2 := Get_Convention_Name (Iface_Conv); |
| Error_Msg_Sloc := Sloc (Iface_Prim); |
| Error_Msg_N ("\\overridden operation % with " |
| & "convention % defined #", Typ); |
| |
| -- Avoid cascading errors |
| |
| return; |
| end if; |
| |
| Next_Elmt (Iface_Prim_Elmt); |
| end loop; |
| |
| Next_Elmt (Iface_Elmt); |
| end loop; |
| end Check_Convention; |
| |
| -- Local variables |
| |
| Prim_Op : Entity_Id; |
| Prim_Op_Elmt : Elmt_Id; |
| |
| -- Start of processing for Check_Conventions |
| |
| begin |
| if not Has_Interfaces (Typ) then |
| return; |
| end if; |
| |
| Collect_Interfaces (Typ, Ifaces_List); |
| |
| -- The algorithm checks every overriding dispatching operation against |
| -- all the corresponding overridden dispatching operations, detecting |
| -- differences in conventions. |
| |
| Prim_Op_Elmt := First_Elmt (Primitive_Operations (Typ)); |
| while Present (Prim_Op_Elmt) loop |
| Prim_Op := Node (Prim_Op_Elmt); |
| |
| -- A small optimization: skip the predefined dispatching operations |
| -- since they always have the same convention. |
| |
| if not Is_Predefined_Dispatching_Operation (Prim_Op) then |
| Check_Convention (Prim_Op); |
| end if; |
| |
| Next_Elmt (Prim_Op_Elmt); |
| end loop; |
| end Check_Conventions; |
| |
| ------------------------------ |
| -- Check_Delayed_Subprogram -- |
| ------------------------------ |
| |
| procedure Check_Delayed_Subprogram (Designator : Entity_Id) is |
| procedure Possible_Freeze (T : Entity_Id); |
| -- T is the type of either a formal parameter or of the return type. If |
| -- T is not yet frozen and needs a delayed freeze, then the subprogram |
| -- itself must be delayed. |
| |
| --------------------- |
| -- Possible_Freeze -- |
| --------------------- |
| |
| procedure Possible_Freeze (T : Entity_Id) is |
| Scop : constant Entity_Id := Scope (Designator); |
| |
| begin |
| -- If the subprogram appears within a package instance (which may be |
| -- the wrapper package of a subprogram instance) the freeze node for |
| -- that package will freeze the subprogram at the proper place, so |
| -- do not emit a freeze node for the subprogram, given that it may |
| -- appear in the wrong scope. |
| |
| if Ekind (Scop) = E_Package |
| and then not Comes_From_Source (Scop) |
| and then Is_Generic_Instance (Scop) |
| then |
| null; |
| |
| elsif Has_Delayed_Freeze (T) and then not Is_Frozen (T) then |
| Set_Has_Delayed_Freeze (Designator); |
| |
| elsif Is_Access_Type (T) |
| and then Has_Delayed_Freeze (Designated_Type (T)) |
| and then not Is_Frozen (Designated_Type (T)) |
| then |
| Set_Has_Delayed_Freeze (Designator); |
| end if; |
| end Possible_Freeze; |
| |
| -- Local variables |
| |
| F : Entity_Id; |
| |
| -- Start of processing for Check_Delayed_Subprogram |
| |
| begin |
| -- All subprograms, including abstract subprograms, may need a freeze |
| -- node if some formal type or the return type needs one. |
| |
| Possible_Freeze (Etype (Designator)); |
| Possible_Freeze (Base_Type (Etype (Designator))); -- needed ??? |
| |
| -- Need delayed freeze if any of the formal types themselves need a |
| -- delayed freeze and are not yet frozen. |
| |
| F := First_Formal (Designator); |
| while Present (F) loop |
| Possible_Freeze (Etype (F)); |
| Possible_Freeze (Base_Type (Etype (F))); -- needed ??? |
| Next_Formal (F); |
| end loop; |
| |
| -- Mark functions that return by reference. Note that it cannot be done |
| -- for delayed_freeze subprograms because the underlying returned type |
| -- may not be known yet (for private types). |
| |
| if not Has_Delayed_Freeze (Designator) and then Expander_Active then |
| declare |
| Typ : constant Entity_Id := Etype (Designator); |
| Utyp : constant Entity_Id := Underlying_Type (Typ); |
| |
| begin |
| if Is_Limited_View (Typ) then |
| Set_Returns_By_Ref (Designator); |
| |
| elsif Present (Utyp) and then CW_Or_Has_Controlled_Part (Utyp) then |
| Set_Returns_By_Ref (Designator); |
| end if; |
| end; |
| end if; |
| end Check_Delayed_Subprogram; |
| |
| ------------------------------------ |
| -- Check_Discriminant_Conformance -- |
| ------------------------------------ |
| |
| procedure Check_Discriminant_Conformance |
| (N : Node_Id; |
| Prev : Entity_Id; |
| Prev_Loc : Node_Id) |
| is |
| Old_Discr : Entity_Id := First_Discriminant (Prev); |
| New_Discr : Node_Id := First (Discriminant_Specifications (N)); |
| New_Discr_Id : Entity_Id; |
| New_Discr_Type : Entity_Id; |
| |
| procedure Conformance_Error (Msg : String; N : Node_Id); |
| -- Post error message for conformance error on given node. Two messages |
| -- are output. The first points to the previous declaration with a |
| -- general "no conformance" message. The second is the detailed reason, |
| -- supplied as Msg. The parameter N provide information for a possible |
| -- & insertion in the message. |
| |
| ----------------------- |
| -- Conformance_Error -- |
| ----------------------- |
| |
| procedure Conformance_Error (Msg : String; N : Node_Id) is |
| begin |
| Error_Msg_Sloc := Sloc (Prev_Loc); |
| Error_Msg_N -- CODEFIX |
| ("not fully conformant with declaration#!", N); |
| Error_Msg_NE (Msg, N, N); |
| end Conformance_Error; |
| |
| -- Start of processing for Check_Discriminant_Conformance |
| |
| begin |
| while Present (Old_Discr) and then Present (New_Discr) loop |
| New_Discr_Id := Defining_Identifier (New_Discr); |
| |
| -- The subtype mark of the discriminant on the full type has not |
| -- been analyzed so we do it here. For an access discriminant a new |
| -- type is created. |
| |
| if Nkind (Discriminant_Type (New_Discr)) = N_Access_Definition then |
| New_Discr_Type := |
| Access_Definition (N, Discriminant_Type (New_Discr)); |
| |
| else |
| Find_Type (Discriminant_Type (New_Discr)); |
| New_Discr_Type := Etype (Discriminant_Type (New_Discr)); |
| |
| -- Ada 2005: if the discriminant definition carries a null |
| -- exclusion, create an itype to check properly for consistency |
| -- with partial declaration. |
| |
| if Is_Access_Type (New_Discr_Type) |
| and then Null_Exclusion_Present (New_Discr) |
| then |
| New_Discr_Type := |
| Create_Null_Excluding_Itype |
| (T => New_Discr_Type, |
| Related_Nod => New_Discr, |
| Scope_Id => Current_Scope); |
| end if; |
| end if; |
| |
| if not Conforming_Types |
| (Etype (Old_Discr), New_Discr_Type, Fully_Conformant) |
| then |
| Conformance_Error ("type of & does not match!", New_Discr_Id); |
| return; |
| else |
| -- Treat the new discriminant as an occurrence of the old one, |
| -- for navigation purposes, and fill in some semantic |
| -- information, for completeness. |
| |
| Generate_Reference (Old_Discr, New_Discr_Id, 'r'); |
| Set_Etype (New_Discr_Id, Etype (Old_Discr)); |
| Set_Scope (New_Discr_Id, Scope (Old_Discr)); |
| end if; |
| |
| -- Names must match |
| |
| if Chars (Old_Discr) /= Chars (Defining_Identifier (New_Discr)) then |
| Conformance_Error ("name & does not match!", New_Discr_Id); |
| return; |
| end if; |
| |
| -- Default expressions must match |
| |
| declare |
| NewD : constant Boolean := |
| Present (Expression (New_Discr)); |
| OldD : constant Boolean := |
| Present (Expression (Parent (Old_Discr))); |
| |
| begin |
| if NewD or OldD then |
| |
| -- The old default value has been analyzed and expanded, |
| -- because the current full declaration will have frozen |
| -- everything before. The new default values have not been |
| -- expanded, so expand now to check conformance. |
| |
| if NewD then |
| Preanalyze_Spec_Expression |
| (Expression (New_Discr), New_Discr_Type); |
| end if; |
| |
| if not (NewD and OldD) |
| or else not Fully_Conformant_Expressions |
| (Expression (Parent (Old_Discr)), |
| Expression (New_Discr)) |
| |
| then |
| Conformance_Error |
| ("default expression for & does not match!", |
| New_Discr_Id); |
| return; |
| end if; |
| end if; |
| end; |
| |
| -- In Ada 83 case, grouping must match: (A,B : X) /= (A : X; B : X) |
| |
| if Ada_Version = Ada_83 then |
| declare |
| Old_Disc : constant Node_Id := Declaration_Node (Old_Discr); |
| |
| begin |
| -- Grouping (use of comma in param lists) must be the same |
| -- This is where we catch a misconformance like: |
| |
| -- A, B : Integer |
| -- A : Integer; B : Integer |
| |
| -- which are represented identically in the tree except |
| -- for the setting of the flags More_Ids and Prev_Ids. |
| |
| if More_Ids (Old_Disc) /= More_Ids (New_Discr) |
| or else Prev_Ids (Old_Disc) /= Prev_Ids (New_Discr) |
| then |
| Conformance_Error |
| ("grouping of & does not match!", New_Discr_Id); |
| return; |
| end if; |
| end; |
| end if; |
| |
| Next_Discriminant (Old_Discr); |
| Next (New_Discr); |
| end loop; |
| |
| if Present (Old_Discr) then |
| Conformance_Error ("too few discriminants!", Defining_Identifier (N)); |
| return; |
| |
| elsif Present (New_Discr) then |
| Conformance_Error |
| ("too many discriminants!", Defining_Identifier (New_Discr)); |
| return; |
| end if; |
| end Check_Discriminant_Conformance; |
| |
| ---------------------------- |
| -- Check_Fully_Conformant -- |
| ---------------------------- |
| |
| procedure Check_Fully_Conformant |
| (New_Id : Entity_Id; |
| Old_Id : Entity_Id; |
| Err_Loc : Node_Id := Empty) |
| is |
| Result : Boolean; |
| pragma Warnings (Off, Result); |
| begin |
| Check_Conformance |
| (New_Id, Old_Id, Fully_Conformant, True, Result, Err_Loc); |
| end Check_Fully_Conformant; |
| |
| -------------------------- |
| -- Check_Limited_Return -- |
| -------------------------- |
| |
| procedure Check_Limited_Return |
| (N : Node_Id; |
| Expr : Node_Id; |
| R_Type : Entity_Id) |
| is |
| begin |
| -- Ada 2005 (AI-318-02): Return-by-reference types have been removed and |
| -- replaced by anonymous access results. This is an incompatibility with |
| -- Ada 95. Not clear whether this should be enforced yet or perhaps |
| -- controllable with special switch. ??? |
| |
| -- A limited interface that is not immutably limited is OK |
| |
| if Is_Limited_Interface (R_Type) |
| and then |
| not (Is_Task_Interface (R_Type) |
| or else Is_Protected_Interface (R_Type) |
| or else Is_Synchronized_Interface (R_Type)) |
| then |
| null; |
| |
| elsif Is_Limited_Type (R_Type) |
| and then not Is_Interface (R_Type) |
| and then Comes_From_Source (N) |
| and then not In_Instance_Body |
| and then not OK_For_Limited_Init_In_05 (R_Type, Expr) |
| then |
| -- Error in Ada 2005 |
| |
| if Ada_Version >= Ada_2005 |
| and then not Debug_Flag_Dot_L |
| and then not GNAT_Mode |
| then |
| Error_Msg_N |
| ("(Ada 2005) cannot copy object of a limited type " |
| & "(RM-2005 6.5(5.5/2))", Expr); |
| |
| if Is_Limited_View (R_Type) then |
| Error_Msg_N |
| ("\return by reference not permitted in Ada 2005", Expr); |
| end if; |
| |
| -- Warn in Ada 95 mode, to give folks a heads up about this |
| -- incompatibility. |
| |
| -- In GNAT mode, this is just a warning, to allow it to be evilly |
| -- turned off. Otherwise it is a real error. |
| |
| -- In a generic context, simplify the warning because it makes no |
| -- sense to discuss pass-by-reference or copy. |
| |
| elsif Warn_On_Ada_2005_Compatibility or GNAT_Mode then |
| if Inside_A_Generic then |
| Error_Msg_N |
| ("return of limited object not permitted in Ada 2005 " |
| & "(RM-2005 6.5(5.5/2))?y?", Expr); |
| |
| elsif Is_Limited_View (R_Type) then |
| Error_Msg_N |
| ("return by reference not permitted in Ada 2005 " |
| & "(RM-2005 6.5(5.5/2))?y?", Expr); |
| else |
| Error_Msg_N |
| ("cannot copy object of a limited type in Ada 2005 " |
| & "(RM-2005 6.5(5.5/2))?y?", Expr); |
| end if; |
| |
| -- Ada 95 mode, and compatibility warnings disabled |
| |
| else |
| pragma Assert (Ada_Version <= Ada_95); |
| pragma Assert (not (Warn_On_Ada_2005_Compatibility or GNAT_Mode)); |
| return; -- skip continuation messages below |
| end if; |
| |
| if not Inside_A_Generic then |
| Error_Msg_N |
| ("\consider switching to return of access type", Expr); |
| Explain_Limited_Type (R_Type, Expr); |
| end if; |
| end if; |
| end Check_Limited_Return; |
| |
| --------------------------- |
| -- Check_Mode_Conformant -- |
| --------------------------- |
| |
| procedure Check_Mode_Conformant |
| (New_Id : Entity_Id; |
| Old_Id : Entity_Id; |
| Err_Loc : Node_Id := Empty; |
| Get_Inst : Boolean := False) |
| is |
| Result : Boolean; |
| pragma Warnings (Off, Result); |
| begin |
| Check_Conformance |
| (New_Id, Old_Id, Mode_Conformant, True, Result, Err_Loc, Get_Inst); |
| end Check_Mode_Conformant; |
| |
| -------------------------------- |
| -- Check_Overriding_Indicator -- |
| -------------------------------- |
| |
| procedure Check_Overriding_Indicator |
| (Subp : Entity_Id; |
| Overridden_Subp : Entity_Id; |
| Is_Primitive : Boolean) |
| is |
| Decl : Node_Id; |
| Spec : Node_Id; |
| |
| begin |
| -- No overriding indicator for literals |
| |
| if Ekind (Subp) = E_Enumeration_Literal then |
| return; |
| |
| elsif Ekind (Subp) = E_Entry then |
| Decl := Parent (Subp); |
| |
| -- No point in analyzing a malformed operator |
| |
| elsif Nkind (Subp) = N_Defining_Operator_Symbol |
| and then Error_Posted (Subp) |
| then |
| return; |
| |
| else |
| Decl := Unit_Declaration_Node (Subp); |
| end if; |
| |
| if Nkind_In (Decl, N_Subprogram_Body, |
| N_Subprogram_Body_Stub, |
| N_Subprogram_Declaration, |
| N_Abstract_Subprogram_Declaration, |
| N_Subprogram_Renaming_Declaration) |
| then |
| Spec := Specification (Decl); |
| |
| elsif Nkind (Decl) = N_Entry_Declaration then |
| Spec := Decl; |
| |
| else |
| return; |
| end if; |
| |
| -- The overriding operation is type conformant with the overridden one, |
| -- but the names of the formals are not required to match. If the names |
| -- appear permuted in the overriding operation, this is a possible |
| -- source of confusion that is worth diagnosing. Controlling formals |
| -- often carry names that reflect the type, and it is not worthwhile |
| -- requiring that their names match. |
| |
| if Present (Overridden_Subp) |
| and then Nkind (Subp) /= N_Defining_Operator_Symbol |
| then |
| declare |
| Form1 : Entity_Id; |
| Form2 : Entity_Id; |
| |
| begin |
| Form1 := First_Formal (Subp); |
| Form2 := First_Formal (Overridden_Subp); |
| |
| -- If the overriding operation is a synchronized operation, skip |
| -- the first parameter of the overridden operation, which is |
| -- implicit in the new one. If the operation is declared in the |
| -- body it is not primitive and all formals must match. |
| |
| if Is_Concurrent_Type (Scope (Subp)) |
| and then Is_Tagged_Type (Scope (Subp)) |
| and then not Has_Completion (Scope (Subp)) |
| then |
| Form2 := Next_Formal (Form2); |
| end if; |
| |
| if Present (Form1) then |
| Form1 := Next_Formal (Form1); |
| Form2 := Next_Formal (Form2); |
| end if; |
| |
| while Present (Form1) loop |
| if not Is_Controlling_Formal (Form1) |
| and then Present (Next_Formal (Form2)) |
| and then Chars (Form1) = Chars (Next_Formal (Form2)) |
| then |
| Error_Msg_Node_2 := Alias (Overridden_Subp); |
| Error_Msg_Sloc := Sloc (Error_Msg_Node_2); |
| Error_Msg_NE |
| ("& does not match corresponding formal of&#", |
| Form1, Form1); |
| exit; |
| end if; |
| |
| Next_Formal (Form1); |
| Next_Formal (Form2); |
| end loop; |
| end; |
| end if; |
| |
| -- If there is an overridden subprogram, then check that there is no |
| -- "not overriding" indicator, and mark the subprogram as overriding. |
| |
| -- This is not done if the overridden subprogram is marked as hidden, |
| -- which can occur for the case of inherited controlled operations |
| -- (see Derive_Subprogram), unless the inherited subprogram's parent |
| -- subprogram is not itself hidden or we are within a generic instance, |
| -- in which case the hidden flag may have been modified for the |
| -- expansion of the instance. |
| |
| -- (Note: This condition could probably be simplified, leaving out the |
| -- testing for the specific controlled cases, but it seems safer and |
| -- clearer this way, and echoes similar special-case tests of this |
| -- kind in other places.) |
| |
| if Present (Overridden_Subp) |
| and then (not Is_Hidden (Overridden_Subp) |
| or else |
| (Nam_In (Chars (Overridden_Subp), Name_Initialize, |
| Name_Adjust, |
| Name_Finalize) |
| and then Present (Alias (Overridden_Subp)) |
| and then (not Is_Hidden (Alias (Overridden_Subp)) |
| or else In_Instance))) |
| then |
| if Must_Not_Override (Spec) then |
| Error_Msg_Sloc := Sloc (Overridden_Subp); |
| |
| if Ekind (Subp) = E_Entry then |
| Error_Msg_NE |
| ("entry & overrides inherited operation #", Spec, Subp); |
| else |
| Error_Msg_NE |
| ("subprogram & overrides inherited operation #", Spec, Subp); |
| end if; |
| |
| -- Special-case to fix a GNAT oddity: Limited_Controlled is declared |
| -- as an extension of Root_Controlled, and thus has a useless Adjust |
| -- operation. This operation should not be inherited by other limited |
| -- controlled types. An explicit Adjust for them is not overriding. |
| |
| elsif Must_Override (Spec) |
| and then Chars (Overridden_Subp) = Name_Adjust |
| and then Is_Limited_Type (Etype (First_Formal (Subp))) |
| and then Present (Alias (Overridden_Subp)) |
| and then In_Predefined_Unit (Alias (Overridden_Subp)) |
| then |
| Get_Name_String |
| (Unit_File_Name (Get_Source_Unit (Alias (Overridden_Subp)))); |
| Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); |
| |
| elsif Is_Subprogram (Subp) then |
| if Is_Init_Proc (Subp) then |
| null; |
| |
| elsif No (Overridden_Operation (Subp)) then |
| |
| -- For entities generated by Derive_Subprograms the overridden |
| -- operation is the inherited primitive (which is available |
| -- through the attribute alias) |
| |
| if (Is_Dispatching_Operation (Subp) |
| or else Is_Dispatching_Operation (Overridden_Subp)) |
| and then not Comes_From_Source (Overridden_Subp) |
| and then Find_Dispatching_Type (Overridden_Subp) = |
| Find_Dispatching_Type (Subp) |
| and then Present (Alias (Overridden_Subp)) |
| and then Comes_From_Source (Alias (Overridden_Subp)) |
| then |
| Set_Overridden_Operation (Subp, Alias (Overridden_Subp)); |
| Inherit_Subprogram_Contract (Subp, Alias (Overridden_Subp)); |
| |
| else |
| Set_Overridden_Operation (Subp, Overridden_Subp); |
| Inherit_Subprogram_Contract (Subp, Overridden_Subp); |
| end if; |
| end if; |
| end if; |
| |
| -- If primitive flag is set or this is a protected operation, then |
| -- the operation is overriding at the point of its declaration, so |
| -- warn if necessary. Otherwise it may have been declared before the |
| -- operation it overrides and no check is required. |
| |
| if Style_Check |
| and then not Must_Override (Spec) |
| and then (Is_Primitive |
| or else Ekind (Scope (Subp)) = E_Protected_Type) |
| then |
| Style.Missing_Overriding (Decl, Subp); |
| end if; |
| |
| -- If Subp is an operator, it may override a predefined operation, if |
| -- it is defined in the same scope as the type to which it applies. |
| -- In that case Overridden_Subp is empty because of our implicit |
| -- representation for predefined operators. We have to check whether the |
| -- signature of Subp matches that of a predefined operator. Note that |
| -- first argument provides the name of the operator, and the second |
| -- argument the signature that may match that of a standard operation. |
| -- If the indicator is overriding, then the operator must match a |
| -- predefined signature, because we know already that there is no |
| -- explicit overridden operation. |
| |
| elsif Nkind (Subp) = N_Defining_Operator_Symbol then |
| if Must_Not_Override (Spec) then |
| |
| -- If this is not a primitive or a protected subprogram, then |
| -- "not overriding" is illegal. |
| |
| if not Is_Primitive |
| and then Ekind (Scope (Subp)) /= E_Protected_Type |
| then |
| Error_Msg_N ("overriding indicator only allowed " |
| & "if subprogram is primitive", Subp); |
| |
| elsif Can_Override_Operator (Subp) then |
| Error_Msg_NE |
| ("subprogram& overrides predefined operator ", Spec, Subp); |
| end if; |
| |
| elsif Must_Override (Spec) then |
| if No (Overridden_Operation (Subp)) |
| and then not Can_Override_Operator (Subp) |
| then |
| Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); |
| end if; |
| |
| elsif not Error_Posted (Subp) |
| and then Style_Check |
| and then Can_Override_Operator (Subp) |
| and then not In_Predefined_Unit (Subp) |
| then |
| -- If style checks are enabled, indicate that the indicator is |
| -- missing. However, at the point of declaration, the type of |
| -- which this is a primitive operation may be private, in which |
| -- case the indicator would be premature. |
| |
| if Has_Private_Declaration (Etype (Subp)) |
| or else Has_Private_Declaration (Etype (First_Formal (Subp))) |
| then |
| null; |
| else |
| Style.Missing_Overriding (Decl, Subp); |
| end if; |
| end if; |
| |
| elsif Must_Override (Spec) then |
| if Ekind (Subp) = E_Entry then |
| Error_Msg_NE ("entry & is not overriding", Spec, Subp); |
| else |
| Error_Msg_NE ("subprogram & is not overriding", Spec, Subp); |
| end if; |
| |
| -- If the operation is marked "not overriding" and it's not primitive |
| -- then an error is issued, unless this is an operation of a task or |
| -- protected type (RM05-8.3.1(3/2-4/2)). Error cases where "overriding" |
| -- has been specified have already been checked above. |
| |
| elsif Must_Not_Override (Spec) |
| and then not Is_Primitive |
| and then Ekind (Subp) /= E_Entry |
| and then Ekind (Scope (Subp)) /= E_Protected_Type |
| then |
| Error_Msg_N |
| ("overriding indicator only allowed if subprogram is primitive", |
| Subp); |
| return; |
| end if; |
| end Check_Overriding_Indicator; |
| |
| ------------------- |
| -- Check_Returns -- |
| ------------------- |
| |
| -- Note: this procedure needs to know far too much about how the expander |
| -- messes with exceptions. The use of the flag Exception_Junk and the |
| -- incorporation of knowledge of Exp_Ch11.Expand_Local_Exception_Handlers |
| -- works, but is not very clean. It would be better if the expansion |
| -- routines would leave Original_Node working nicely, and we could use |
| -- Original_Node here to ignore all the peculiar expander messing ??? |
| |
| procedure Check_Returns |
| (HSS : Node_Id; |
| Mode : Character; |
| Err : out Boolean; |
| Proc : Entity_Id := Empty) |
| is |
| Handler : Node_Id; |
| |
| procedure Check_Statement_Sequence (L : List_Id); |
| -- Internal recursive procedure to check a list of statements for proper |
| -- termination by a return statement (or a transfer of control or a |
| -- compound statement that is itself internally properly terminated). |
| |
| ------------------------------ |
| -- Check_Statement_Sequence -- |
| ------------------------------ |
| |
| procedure Check_Statement_Sequence (L : List_Id) is |
| Last_Stm : Node_Id; |
| Stm : Node_Id; |
| Kind : Node_Kind; |
| |
| function Assert_False return Boolean; |
| -- Returns True if Last_Stm is a pragma Assert (False) that has been |
| -- rewritten as a null statement when assertions are off. The assert |
| -- is not active, but it is still enough to kill the warning. |
| |
| ------------------ |
| -- Assert_False -- |
| ------------------ |
| |
| function Assert_False return Boolean is |
| Orig : constant Node_Id := Original_Node (Last_Stm); |
| |
| begin |
| if Nkind (Orig) = N_Pragma |
| and then Pragma_Name (Orig) = Name_Assert |
| and then not Error_Posted (Orig) |
| then |
| declare |
| Arg : constant Node_Id := |
| First (Pragma_Argument_Associations (Orig)); |
| Exp : constant Node_Id := Expression (Arg); |
| begin |
| return Nkind (Exp) = N_Identifier |
| and then Chars (Exp) = Name_False; |
| end; |
| |
| else |
| return False; |
| end if; |
| end Assert_False; |
| |
| -- Local variables |
| |
| Raise_Exception_Call : Boolean; |
| -- Set True if statement sequence terminated by Raise_Exception call |
| -- or a Reraise_Occurrence call. |
| |
| -- Start of processing for Check_Statement_Sequence |
| |
| begin |
| Raise_Exception_Call := False; |
| |
| -- Get last real statement |
| |
| Last_Stm := Last (L); |
| |
| -- Deal with digging out exception handler statement sequences that |
| -- have been transformed by the local raise to goto optimization. |
| -- See Exp_Ch11.Expand_Local_Exception_Handlers for details. If this |
| -- optimization has occurred, we are looking at something like: |
| |
| -- begin |
| -- original stmts in block |
| |
| -- exception \ |
| -- when excep1 => | |
| -- goto L1; | omitted if No_Exception_Propagation |
| -- when excep2 => | |
| -- goto L2; / |
| -- end; |
| |
| -- goto L3; -- skip handler when exception not raised |
| |
| -- <<L1>> -- target label for local exception |
| -- begin |
| -- estmts1 |
| -- end; |
| |
| -- goto L3; |
| |
| -- <<L2>> |
| -- begin |
| -- estmts2 |
| -- end; |
| |
| -- <<L3>> |
| |
| -- and what we have to do is to dig out the estmts1 and estmts2 |
| -- sequences (which were the original sequences of statements in |
| -- the exception handlers) and check them. |
| |
| if Nkind (Last_Stm) = N_Label and then Exception_Junk (Last_Stm) then |
| Stm := Last_Stm; |
| loop |
| Prev (Stm); |
| exit when No (Stm); |
| exit when Nkind (Stm) /= N_Block_Statement; |
| exit when not Exception_Junk (Stm); |
| Prev (Stm); |
| exit when No (Stm); |
| exit when Nkind (Stm) /= N_Label; |
| exit when not Exception_Junk (Stm); |
| Check_Statement_Sequence |
| (Statements (Handled_Statement_Sequence (Next (Stm)))); |
| |
| Prev (Stm); |
| Last_Stm := Stm; |
| exit when No (Stm); |
| exit when Nkind (Stm) /= N_Goto_Statement; |
| exit when not Exception_Junk (Stm); |
| end loop; |
| end if; |
| |
| -- Don't count pragmas |
| |
| while Nkind (Last_Stm) = N_Pragma |
| |
| -- Don't count call to SS_Release (can happen after Raise_Exception) |
| |
| or else |
| (Nkind (Last_Stm) = N_Procedure_Call_Statement |
| and then |
| Nkind (Name (Last_Stm)) = N_Identifier |
| and then |
| Is_RTE (Entity (Name (Last_Stm)), RE_SS_Release)) |
| |
| -- Don't count exception junk |
| |
| or else |
| (Nkind_In (Last_Stm, N_Goto_Statement, |
| N_Label, |
| N_Object_Declaration) |
| and then Exception_Junk (Last_Stm)) |
| or else Nkind (Last_Stm) in N_Push_xxx_Label |
| or else Nkind (Last_Stm) in N_Pop_xxx_Label |
| |
| -- Inserted code, such as finalization calls, is irrelevant: we only |
| -- need to check original source. |
| |
| or else Is_Rewrite_Insertion (Last_Stm) |
| loop |
| Prev (Last_Stm); |
| end loop; |
| |
| -- Here we have the "real" last statement |
| |
| Kind := Nkind (Last_Stm); |
| |
| -- Transfer of control, OK. Note that in the No_Return procedure |
| -- case, we already diagnosed any explicit return statements, so |
| -- we can treat them as OK in this context. |
| |
| if Is_Transfer (Last_Stm) then |
| return; |
| |
| -- Check cases of explicit non-indirect procedure calls |
| |
| elsif Kind = N_Procedure_Call_Statement |
| and then Is_Entity_Name (Name (Last_Stm)) |
| then |
| -- Check call to Raise_Exception procedure which is treated |
| -- specially, as is a call to Reraise_Occurrence. |
| |
| -- We suppress the warning in these cases since it is likely that |
| -- the programmer really does not expect to deal with the case |
| -- of Null_Occurrence, and thus would find a warning about a |
| -- missing return curious, and raising Program_Error does not |
| -- seem such a bad behavior if this does occur. |
| |
| -- Note that in the Ada 2005 case for Raise_Exception, the actual |
| -- behavior will be to raise Constraint_Error (see AI-329). |
| |
| if Is_RTE (Entity (Name (Last_Stm)), RE_Raise_Exception) |
| or else |
| Is_RTE (Entity (Name (Last_Stm)), RE_Reraise_Occurrence) |
| then |
| Raise_Exception_Call := True; |
| |
| -- For Raise_Exception call, test first argument, if it is |
| -- an attribute reference for a 'Identity call, then we know |
| -- that the call cannot possibly return. |
| |
| declare |
| Arg : constant Node_Id := |
| Original_Node (First_Actual (Last_Stm)); |
| begin |
| if Nkind (Arg) = N_Attribute_Reference |
| and then Attribute_Name (Arg) = Name_Identity |
| then |
| return; |
| end if; |
| end; |
| end if; |
| |
| -- If statement, need to look inside if there is an else and check |
| -- each constituent statement sequence for proper termination. |
| |
| elsif Kind = N_If_Statement |
| and then Present (Else_Statements (Last_Stm)) |
| then |
| Check_Statement_Sequence (Then_Statements (Last_Stm)); |
| Check_Statement_Sequence (Else_Statements (Last_Stm)); |
| |
| if Present (Elsif_Parts (Last_Stm)) then |
| declare |
| Elsif_Part : Node_Id := First (Elsif_Parts (Last_Stm)); |
| |
| begin |
| while Present (Elsif_Part) loop |
| Check_Statement_Sequence (Then_Statements (Elsif_Part)); |
| Next (Elsif_Part); |
| end loop; |
| end; |
| end if; |
| |
| return; |
| |
| -- Case statement, check each case for proper termination |
| |
| elsif Kind = N_Case_Statement then |
| declare |
| Case_Alt : Node_Id; |
| begin |
| Case_Alt := First_Non_Pragma (Alternatives (Last_Stm)); |
| while Present (Case_Alt) loop |
| Check_Statement_Sequence (Statements (Case_Alt)); |
| Next_Non_Pragma (Case_Alt); |
| end loop; |
| end; |
| |
| return; |
| |
| -- Block statement, check its handled sequence of statements |
| |
| elsif Kind = N_Block_Statement then |
| declare |
| Err1 : Boolean; |
| |
| begin |
| Check_Returns |
| (Handled_Statement_Sequence (Last_Stm), Mode, Err1); |
| |
| if Err1 then |
| Err := True; |
| end if; |
| |
| return; |
| end; |
| |
| -- Loop statement. If there is an iteration scheme, we can definitely |
| -- fall out of the loop. Similarly if there is an exit statement, we |
| -- can fall out. In either case we need a following return. |
| |
| elsif Kind = N_Loop_Statement then |
| if Present (Iteration_Scheme (Last_Stm)) |
| or else Has_Exit (Entity (Identifier (Last_Stm))) |
| then |
| null; |
| |
| -- A loop with no exit statement or iteration scheme is either |
| -- an infinite loop, or it has some other exit (raise/return). |
| -- In either case, no warning is required. |
| |
| else |
| return; |
| end if; |
| |
| -- Timed entry call, check entry call and delay alternatives |
| |
| -- Note: in expanded code, the timed entry call has been converted |
| -- to a set of expanded statements on which the check will work |
| -- correctly in any case. |
| |
| elsif Kind = N_Timed_Entry_Call then |
| declare |
| ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); |
| DCA : constant Node_Id := Delay_Alternative (Last_Stm); |
| |
| begin |
| -- If statement sequence of entry call alternative is missing, |
| -- then we can definitely fall through, and we post the error |
| -- message on the entry call alternative itself. |
| |
| if No (Statements (ECA)) then |
| Last_Stm := ECA; |
| |
| -- If statement sequence of delay alternative is missing, then |
| -- we can definitely fall through, and we post the error |
| -- message on the delay alternative itself. |
| |
| -- Note: if both ECA and DCA are missing the return, then we |
| -- post only one message, should be enough to fix the bugs. |
| -- If not we will get a message next time on the DCA when the |
| -- ECA is fixed. |
| |
| elsif No (Statements (DCA)) then |
| Last_Stm := DCA; |
| |
| -- Else check both statement sequences |
| |
| else |
| Check_Statement_Sequence (Statements (ECA)); |
| Check_Statement_Sequence (Statements (DCA)); |
| return; |
| end if; |
| end; |
| |
| -- Conditional entry call, check entry call and else part |
| |
| -- Note: in expanded code, the conditional entry call has been |
| -- converted to a set of expanded statements on which the check |
| -- will work correctly in any case. |
| |
| elsif Kind = N_Conditional_Entry_Call then |
| declare |
| ECA : constant Node_Id := Entry_Call_Alternative (Last_Stm); |
| |
| begin |
| -- If statement sequence of entry call alternative is missing, |
| -- then we can definitely fall through, and we post the error |
| -- message on the entry call alternative itself. |
| |
| if No (Statements (ECA)) then |
| Last_Stm := ECA; |
| |
| -- Else check statement sequence and else part |
| |
| else |
| Check_Statement_Sequence (Statements (ECA)); |
| Check_Statement_Sequence (Else_Statements (Last_Stm)); |
| return; |
| end if; |
| end; |
| end if; |
| |
| -- If we fall through, issue appropriate message |
| |
| if Mode = 'F' then |
| |
| -- Kill warning if last statement is a raise exception call, |
| -- or a pragma Assert (False). Note that with assertions enabled, |
| -- such a pragma has been converted into a raise exception call |
| -- already, so the Assert_False is for the assertions off case. |
| |
| if not Raise_Exception_Call and then not Assert_False then |
| |
| -- In GNATprove mode, it is an error to have a missing return |
| |
| Error_Msg_Warn := SPARK_Mode /= On; |
| |
| -- Issue error message or warning |
| |
| Error_Msg_N |
| ("RETURN statement missing following this statement<<!", |
| Last_Stm); |
| Error_Msg_N |
| ("\Program_Error ]<<!", Last_Stm); |
| end if; |
| |
| -- Note: we set Err even though we have not issued a warning |
| -- because we still have a case of a missing return. This is |
| -- an extremely marginal case, probably will never be noticed |
| -- but we might as well get it right. |
| |
| Err := True; |
| |
| -- Otherwise we have the case of a procedure marked No_Return |
| |
| else |
| if not Raise_Exception_Call then |
| if GNATprove_Mode then |
| Error_Msg_N |
| ("implied return after this statement would have raised " |
| & "Program_Error", Last_Stm); |
| |
| -- In normal compilation mode, do not warn on a generated call |
| -- (e.g. in the body of a renaming as completion). |
| |
| elsif Comes_From_Source (Last_Stm) then |
| Error_Msg_N |
| ("implied return after this statement will raise " |
| & "Program_Error??", Last_Stm); |
| end if; |
| |
| Error_Msg_Warn := SPARK_Mode /= On; |
| Error_Msg_NE |
| ("\procedure & is marked as No_Return<<!", Last_Stm, Proc); |
| end if; |
| |
| declare |
| RE : constant Node_Id := |
| Make_Raise_Program_Error (Sloc (Last_Stm), |
| Reason => PE_Implicit_Return); |
| begin |
| Insert_After (Last_Stm, RE); |
| Analyze (RE); |
| end; |
| end if; |
| end Check_Statement_Sequence; |
| |
| -- Start of processing for Check_Returns |
| |
| begin |
| Err := False; |
| Check_Statement_Sequence (Statements (HSS)); |
| |
| if Present (Exception_Handlers (HSS)) then |
| Handler := First_Non_Pragma (Exception_Handlers (HSS)); |
| while Present (Handler) loop |
| Check_Statement_Sequence (Statements (Handler)); |
| Next_Non_Pragma (Handler); |
| end loop; |
| end if; |
| end Check_Returns; |
| |
| ---------------------------- |
| -- Check_Subprogram_Order -- |
| ---------------------------- |
| |
| procedure Check_Subprogram_Order (N : Node_Id) is |
| |
| function Subprogram_Name_Greater (S1, S2 : String) return Boolean; |
| -- This is used to check if S1 > S2 in the sense required by this test, |
| -- for example nameab < namec, but name2 < name10. |
| |
| ----------------------------- |
| -- Subprogram_Name_Greater -- |
| ----------------------------- |
| |
| function Subprogram_Name_Greater (S1, S2 : String) return Boolean is |
| L1, L2 : Positive; |
| N1, N2 : Natural; |
| |
| begin |
| -- Deal with special case where names are identical except for a |
| -- numerical suffix. These are handled specially, taking the numeric |
| -- ordering from the suffix into account. |
| |
| L1 := S1'Last; |
| while S1 (L1) in '0' .. '9' loop |
| L1 := L1 - 1; |
| end loop; |
| |
| L2 := S2'Last; |
| while S2 (L2) in '0' .. '9' loop |
| L2 := L2 - 1; |
| end loop; |
| |
| -- If non-numeric parts non-equal, do straight compare |
| |
| if S1 (S1'First .. L1) /= S2 (S2'First .. L2) then |
| return S1 > S2; |
| |
| -- If non-numeric parts equal, compare suffixed numeric parts. Note |
| -- that a missing suffix is treated as numeric zero in this test. |
| |
| else |
| N1 := 0; |
| while L1 < S1'Last loop |
| L1 := L1 + 1; |
| N1 := N1 * 10 + Character'Pos (S1 (L1)) - Character'Pos ('0'); |
| end loop; |
| |
| N2 := 0; |
| while L2 < S2'Last loop |
| L2 := L2 + 1; |
| N2 := N2 * 10 + Character'Pos (S2 (L2)) - Character'Pos ('0'); |
| end loop; |
| |
| return N1 > N2; |
| end if; |
| end Subprogram_Name_Greater; |
| |
| -- Start of processing for Check_Subprogram_Order |
| |
| begin |
| -- Check body in alpha order if this is option |
| |
| if Style_Check |
| and then Style_Check_Order_Subprograms |
| and then Nkind (N) = N_Subprogram_Body |
| and then Comes_From_Source (N) |
| and then In_Extended_Main_Source_Unit (N) |
| then |
| declare |
| LSN : String_Ptr |
| renames Scope_Stack.Table |
| (Scope_Stack.Last).Last_Subprogram_Name; |
| |
| Body_Id : constant Entity_Id := |
| Defining_Entity (Specification (N)); |
| |
| begin |
| Get_Decoded_Name_String (Chars (Body_Id)); |
| |
| if LSN /= null then |
| if Subprogram_Name_Greater |
| (LSN.all, Name_Buffer (1 .. Name_Len)) |
| then |
| Style.Subprogram_Not_In_Alpha_Order (Body_Id); |
| end if; |
| |
| Free (LSN); |
| end if; |
| |
| LSN := new String'(Name_Buffer (1 .. Name_Len)); |
| end; |
| end if; |
| end Check_Subprogram_Order; |
| |
| ------------------------------ |
| -- Check_Subtype_Conformant -- |
| ------------------------------ |
| |
| procedure Check_Subtype_Conformant |
| (New_Id : Entity_Id; |
| Old_Id : Entity_Id; |
| Err_Loc : Node_Id := Empty; |
| Skip_Controlling_Formals : Boolean := False; |
| Get_Inst : Boolean := False) |
| is |
| Result : Boolean; |
| pragma Warnings (Off, Result); |
| begin |
| Check_Conformance |
| (New_Id, Old_Id, Subtype_Conformant, True, Result, Err_Loc, |
| Skip_Controlling_Formals => Skip_Controlling_Formals, |
| Get_Inst => Get_Inst); |
| end Check_Subtype_Conformant; |
| |
| ----------------------------------- |
| -- Check_Synchronized_Overriding -- |
| ----------------------------------- |
| |
| procedure Check_Synchronized_Overriding |
| (Def_Id : Entity_Id; |
| Overridden_Subp : out Entity_Id) |
| is |
| Ifaces_List : Elist_Id; |
| In_Scope : Boolean; |
| Typ : Entity_Id; |
| |
| function Is_Valid_Formal (F : Entity_Id) return Boolean; |
| -- Predicate for legality rule in 9.4 (11.9/2): If an inherited |
| -- subprogram is implemented by a protected procedure or entry, |
| -- its first parameter must be out, in out, or access-to-variable. |
| |
| function Matches_Prefixed_View_Profile |
| (Prim_Params : List_Id; |
| Iface_Params : List_Id) return Boolean; |
| -- Determine whether a subprogram's parameter profile Prim_Params |
| -- matches that of a potentially overridden interface subprogram |
| -- Iface_Params. Also determine if the type of first parameter of |
| -- Iface_Params is an implemented interface. |
| |
| ---------------------- |
| -- Is_Valid_Formal -- |
| ---------------------- |
| |
| function Is_Valid_Formal (F : Entity_Id) return Boolean is |
| begin |
| return |
| Ekind_In (F, E_In_Out_Parameter, E_Out_Parameter) |
| or else |
| (Nkind (Parameter_Type (Parent (F))) = N_Access_Definition |
| and then not Constant_Present (Parameter_Type (Parent (F)))); |
| end Is_Valid_Formal; |
| |
| ----------------------------------- |
| -- Matches_Prefixed_View_Profile -- |
| ----------------------------------- |
| |
| function Matches_Prefixed_View_Profile |
| (Prim_Params : List_Id; |
| Iface_Params : List_Id) return Boolean |
| is |
| function Is_Implemented |
| (Ifaces_List : Elist_Id; |
| Iface : Entity_Id) return Boolean; |
| -- Determine if Iface is implemented by the current task or |
| -- protected type. |
| |
| -------------------- |
| -- Is_Implemented -- |
| -------------------- |
| |
| function Is_Implemented |
| (Ifaces_List : Elist_Id; |
| Iface : Entity_Id) return Boolean |
| is |
| Iface_Elmt : Elmt_Id; |
| |
| begin |
| Iface_Elmt := First_Elmt (Ifaces_List); |
| while Present (Iface_Elmt) loop |
| if Node (Iface_Elmt) = Iface then |
| return True; |
| end if; |
| |
| Next_Elmt (Iface_Elmt); |
| end loop; |
| |
| return False; |
| end Is_Implemented; |
| |
| -- Local variables |
| |
| Iface_Id : Entity_Id; |
| Iface_Param : Node_Id; |
| Iface_Typ : Entity_Id; |
| Prim_Id : Entity_Id; |
| Prim_Param : Node_Id; |
| Prim_Typ : Entity_Id; |
| |
| -- Start of processing for Matches_Prefixed_View_Profile |
| |
| begin |
| Iface_Param := First (Iface_Params); |
| Iface_Typ := Etype (Defining_Identifier (Iface_Param)); |
| |
| if Is_Access_Type (Iface_Typ) then |
| Iface_Typ := Designated_Type (Iface_Typ); |
| end if; |
| |
| Prim_Param := First (Prim_Params); |
| |
| -- The first parameter of the potentially overridden subprogram must |
| -- be an interface implemented by Prim. |
| |
| if not Is_Interface (Iface_Typ) |
| or else not Is_Implemented (Ifaces_List, Iface_Typ) |
| then |
| return False; |
| end if; |
| |
| -- The checks on the object parameters are done, so move on to the |
| -- rest of the parameters. |
| |
| if not In_Scope then |
| Prim_Param := Next (Prim_Param); |
| end if; |
| |
| Iface_Param := Next (Iface_Param); |
| while Present (Iface_Param) and then Present (Prim_Param) loop |
| Iface_Id := Defining_Identifier (Iface_Param); |
| Iface_Typ := Find_Parameter_Type (Iface_Param); |
| |
| Prim_Id := Defining_Identifier (Prim_Param); |
| Prim_Typ := Find_Parameter_Type (Prim_Param); |
| |
| if Ekind (Iface_Typ) = E_Anonymous_Access_Type |
| and then Ekind (Prim_Typ) = E_Anonymous_Access_Type |
| and then Is_Concurrent_Type (Designated_Type (Prim_Typ)) |
| then |
| Iface_Typ := Designated_Type (Iface_Typ); |
| Prim_Typ := Designated_Type (Prim_Typ); |
| end if; |
| |
| -- Case of multiple interface types inside a parameter profile |
| |
| -- (Obj_Param : in out Iface; ...; Param : Iface) |
| |
| -- If the interface type is implemented, then the matching type in |
| -- the primitive should be the implementing record type. |
| |
| if Ekind (Iface_Typ) = E_Record_Type |
| and then Is_Interface (Iface_Typ) |
| and then Is_Implemented (Ifaces_List, Iface_Typ) |
| then |
| if Prim_Typ /= Typ then |
| return False; |
| end if; |
| |
| -- The two parameters must be both mode and subtype conformant |
| |
| elsif Ekind (Iface_Id) /= Ekind (Prim_Id) |
| or else not |
| Conforming_Types (Iface_Typ, Prim_Typ, Subtype_Conformant) |
| then |
| return False; |
| end if; |
| |
| Next (Iface_Param); |
| Next (Prim_Param); |
| end loop; |
| |
| -- One of the two lists contains more parameters than the other |
| |
| if Present (Iface_Param) or else Present (Prim_Param) then |
| return False; |
| end if; |
| |
| return True; |
| end Matches_Prefixed_View_Profile; |
| |
| -- Start of processing for Check_Synchronized_Overriding |
| |
| begin |
| Overridden_Subp := Empty; |
| |
| -- Def_Id must be an entry or a subprogram. We should skip predefined |
| -- primitives internally generated by the front end; however at this |
| -- stage predefined primitives are still not fully decorated. As a |
| -- minor optimization we skip here internally generated subprograms. |
| |
| if (Ekind (Def_Id) /= E_Entry |
| and then Ekind (Def_Id) /= E_Function |
| and then Ekind (Def_Id) /= E_Procedure) |
| or else not Comes_From_Source (Def_Id) |
| then |
| return; |
| end if; |
| |
| -- Search for the concurrent declaration since it contains the list of |
| -- all implemented interfaces. In this case, the subprogram is declared |
| -- within the scope of a protected or a task type. |
| |
| if Present (Scope (Def_Id)) |
| and then Is_Concurrent_Type (Scope (Def_Id)) |
| and then not Is_Generic_Actual_Type (Scope (Def_Id)) |
| then |
| Typ := Scope (Def_Id); |
| In_Scope := True; |
| |
| -- The enclosing scope is not a synchronized type and the subprogram |
| -- has no formals. |
| |
| elsif No (First_Formal (Def_Id)) then |
| return; |
| |
| -- The subprogram has formals and hence it may be a primitive of a |
| -- concurrent type. |
| |
| else |
| Typ := Etype (First_Formal (Def_Id)); |
| |
| if Is_Access_Type (Typ) then |
| Typ := Directly_Designated_Type (Typ); |
| end if; |
| |
| if Is_Concurrent_Type (Typ) |
| and then not Is_Generic_Actual_Type (Typ) |
| then |
| In_Scope := False; |
| |
| -- This case occurs when the concurrent type is declared within a |
| -- generic unit. As a result the corresponding record has been built |
| -- and used as the type of the first formal, we just have to retrieve |
| -- the corresponding concurrent type. |
| |
| elsif Is_Concurrent_Record_Type (Typ) |
| and then not Is_Class_Wide_Type (Typ) |
| and then Present (Corresponding_Concurrent_Type (Typ)) |
| then |
| Typ := Corresponding_Concurrent_Type (Typ); |
| In_Scope := False; |
| |
| else |
| return; |
| end if; |
| end if; |
| |
| -- There is no overriding to check if this is an inherited operation in |
| -- a type derivation for a generic actual. |
| |
| Collect_Interfaces (Typ, Ifaces_List); |
| |
| if Is_Empty_Elmt_List (Ifaces_List) then |
| return; |
| end if; |
| |
| -- Determine whether entry or subprogram Def_Id overrides a primitive |
| -- operation that belongs to one of the interfaces in Ifaces_List. |
| |
| declare |
| Candidate : Entity_Id := Empty; |
| Hom : Entity_Id := Empty; |
| Subp : Entity_Id := Empty; |
| |
| begin |
| -- Traverse the homonym chain, looking for a potentially overridden |
| -- subprogram that belongs to an implemented interface. |
| |
| Hom := Current_Entity_In_Scope (Def_Id); |
| while Present (Hom) loop |
| Subp := Hom; |
| |
| if Subp = Def_Id |
| or else not Is_Overloadable (Subp) |
| or else not Is_Primitive (Subp) |
| or else not Is_Dispatching_Operation (Subp) |
| or else not Present (Find_Dispatching_Type (Subp)) |
| or else not Is_Interface (Find_Dispatching_Type (Subp)) |
| then |
| null; |
| |
| -- Entries and procedures can override abstract or null interface |
| -- procedures. |
| |
| elsif Ekind_In (Def_Id, E_Entry, E_Procedure) |
| and then Ekind (Subp) = E_Procedure |
| and then Matches_Prefixed_View_Profile |
| (Parameter_Specifications (Parent (Def_Id)), |
| Parameter_Specifications (Parent (Subp))) |
| then |
| Candidate := Subp; |
| |
| -- For an overridden subprogram Subp, check whether the mode |
| -- of its first parameter is correct depending on the kind of |
| -- synchronized type. |
| |
| declare |
| Formal : constant Node_Id := First_Formal (Candidate); |
| |
| begin |
| -- In order for an entry or a protected procedure to |
| -- override, the first parameter of the overridden routine |
| -- must be of mode "out", "in out", or access-to-variable. |
| |
| if Ekind_In (Candidate, E_Entry, E_Procedure) |
| and then Is_Protected_Type (Typ) |
| and then not Is_Valid_Formal (Formal) |
| then |
| null; |
| |
| -- All other cases are OK since a task entry or routine does |
| -- not have a restriction on the mode of the first parameter |
| -- of the overridden interface routine. |
| |
| else |
| Overridden_Subp := Candidate; |
| return; |
| end if; |
| end; |
| |
| -- Functions can override abstract interface functions. Return |
| -- types must be subtype conformant. |
| |
| elsif Ekind (Def_Id) = E_Function |
| and then Ekind (Subp) = E_Function |
| and then Matches_Prefixed_View_Profile |
| (Parameter_Specifications (Parent (Def_Id)), |
| Parameter_Specifications (Parent (Subp))) |
| and then Conforming_Types |
| (Etype (Def_Id), Etype (Subp), Subtype_Conformant) |
| then |
| Candidate := Subp; |
| |
| -- If an inherited subprogram is implemented by a protected |
| -- function, then the first parameter of the inherited |
| -- subprogram shall be of mode in, but not an access-to- |
| -- variable parameter (RM 9.4(11/9)). |
| |
| if Present (First_Formal (Subp)) |
| and then Ekind (First_Formal (Subp)) = E_In_Parameter |
| and then |
| (not Is_Access_Type (Etype (First_Formal (Subp))) |
| or else |
| Is_Access_Constant (Etype (First_Formal (Subp)))) |
| then |
| Overridden_Subp := Subp; |
| return; |
| end if; |
| end if; |
| |
| Hom := Homonym (Hom); |
| end loop; |
| |
| -- After examining all candidates for overriding, we are left with |
| -- the best match, which is a mode-incompatible interface routine. |
| |
| if In_Scope and then Present (Candidate) then |
| Error_Msg_PT (Def_Id, Candidate); |
| end if; |
| |
| Overridden_Subp := Candidate; |
| return; |
| end; |
| end Check_Synchronized_Overriding; |
| |
| --------------------------- |
| -- Check_Type_Conformant -- |
| --------------------------- |
| |
| procedure Check_Type_Conformant |
| (New_Id : Entity_Id; |
| Old_Id : Entity_Id; |
| Err_Loc : Node_Id := Empty) |
| is |
| Result : Boolean; |
| pragma Warnings (Off, Result); |
| begin |
| Check_Conformance |
| (New_Id, Old_Id, Type_Conformant, True, Result, Err_Loc); |
| end Check_Type_Conformant; |
| |
| --------------------------- |
| -- Can_Override_Operator -- |
| --------------------------- |
| |
| function Can_Override_Operator (Subp : Entity_Id) return Boolean is |
| Typ : Entity_Id; |
| |
| begin |
| if Nkind (Subp) /= N_Defining_Operator_Symbol then |
| return False; |
| |
| else |
| Typ := Base_Type (Etype (First_Formal (Subp))); |
| |
| -- Check explicitly that the operation is a primitive of the type |
| |
| return Operator_Matches_Spec (Subp, Subp) |
| and then not Is_Generic_Type (Typ) |
| and then Scope (Subp) = Scope (Typ) |
| and then not Is_Class_Wide_Type (Typ); |
| end if; |
| end Can_Override_Operator; |
| |
| ---------------------- |
| -- Conforming_Types -- |
| ---------------------- |
| |
| function Conforming_Types |
| (T1 : Entity_Id; |
| T2 : Entity_Id; |
| Ctype : Conformance_Type; |
| Get_Inst : Boolean := False) return Boolean |
| is |
| function Base_Types_Match |
| (Typ_1 : Entity_Id; |
| Typ_2 : Entity_Id) return Boolean; |
| -- If neither Typ_1 nor Typ_2 are generic actual types, or if they are |
| -- in different scopes (e.g. parent and child instances), then verify |
| -- that the base types are equal. Otherwise Typ_1 and Typ_2 must be on |
| -- the same subtype chain. The whole purpose of this procedure is to |
| -- prevent spurious ambiguities in an instantiation that may arise if |
| -- two distinct generic types are instantiated with the same actual. |
| |
| function Find_Designated_Type (Typ : Entity_Id) return Entity_Id; |
| -- An access parameter can designate an incomplete type. If the |
| -- incomplete type is the limited view of a type from a limited_ |
| -- with_clause, check whether the non-limited view is available. |
| -- If it is a (non-limited) incomplete type, get the full view. |
| |
| function Matches_Limited_With_View |
| (Typ_1 : Entity_Id; |
| Typ_2 : Entity_Id) return Boolean; |
| -- Returns True if and only if either Typ_1 denotes a limited view of |
| -- Typ_2 or Typ_2 denotes a limited view of Typ_1. This can arise when |
| -- the limited with view of a type is used in a subprogram declaration |
| -- and the subprogram body is in the scope of a regular with clause for |
| -- the same unit. In such a case, the two type entities are considered |
| -- identical for purposes of conformance checking. |
| |
| ---------------------- |
| -- Base_Types_Match -- |
| ---------------------- |
| |
| function Base_Types_Match |
| (Typ_1 : Entity_Id; |
| Typ_2 : Entity_Id) return Boolean |
| is |
| Base_1 : constant Entity_Id := Base_Type (Typ_1); |
| Base_2 : constant Entity_Id := Base_Type (Typ_2); |
| |
| begin |
| if Typ_1 = Typ_2 then |
| return True; |
| |
| elsif Base_1 = Base_2 then |
| |
| -- The following is too permissive. A more precise test should |
| -- check that the generic actual is an ancestor subtype of the |
| -- other ???. |
| |
| -- See code in Find_Corresponding_Spec that applies an additional |
| -- filter to handle accidental amiguities in instances. |
| |
| return |
| not Is_Generic_Actual_Type (Typ_1) |
| or else not Is_Generic_Actual_Type (Typ_2) |
| or else Scope (Typ_1) /= Scope (Typ_2); |
| |
| -- If Typ_2 is a generic actual type it is declared as the subtype of |
| -- the actual. If that actual is itself a subtype we need to use its |
| -- own base type to check for compatibility. |
| |
| elsif Ekind (Base_2) = Ekind (Typ_2) |
| and then Base_1 = Base_Type (Base_2) |
| then |
| return True; |
| |
| elsif Ekind (Base_1) = Ekind (Typ_1) |
| and then Base_2 = Base_Type (Base_1) |
| then |
| return True; |
| |
| else |
| return False; |
| end if; |
| end Base_Types_Match; |
| |
| -------------------------- |
| -- Find_Designated_Type -- |
| -------------------------- |
| |
| function Find_Designated_Type (Typ : Entity_Id) return Entity_Id is |
| Desig : Entity_Id; |
| |
| begin |
| Desig := Directly_Designated_Type (Typ); |
| |
| if Ekind (Desig) = E_Incomplete_Type then |
| |
| -- If regular incomplete type, get full view if available |
| |
| if Present (Full_View (Desig)) then |
| Desig := Full_View (Desig); |
| |
| -- If limited view of a type, get non-limited view if available, |
| -- and check again for a regular incomplete type. |
| |
| elsif Present (Non_Limited_View (Desig)) then |
| Desig := Get_Full_View (Non_Limited_View (Desig)); |
| end if; |
| end if; |
| |
| return Desig; |
| end Find_Designated_Type; |
| |
| ------------------------------- |
| -- Matches_Limited_With_View -- |
| ------------------------------- |
| |
| function Matches_Limited_With_View |
| (Typ_1 : Entity_Id; |
| Typ_2 : Entity_Id) return Boolean |
| is |
| function Is_Matching_Limited_View |
| (Typ : Entity_Id; |
| View : Entity_Id) return Boolean; |
| -- Determine whether non-limited view View denotes type Typ in some |
| -- conformant fashion. |
| |
| ------------------------------ |
| -- Is_Matching_Limited_View -- |
| ------------------------------ |
| |
| function Is_Matching_Limited_View |
| (Typ : Entity_Id; |
| View : Entity_Id) return Boolean |
| is |
| Root_Typ : Entity_Id; |
| Root_View : Entity_Id; |
| |
| begin |
| -- The non-limited view directly denotes the type |
| |
| if Typ = View then |
| return True; |
| |
| -- The type is a subtype of the non-limited view |
| |
| elsif Is_Subtype_Of (Typ, View) then |
| return True; |
| |
| -- Both the non-limited view and the type denote class-wide types |
| |
| elsif Is_Class_Wide_Type (Typ) |
| and then Is_Class_Wide_Type (View) |
| then |
| Root_Typ := Root_Type (Typ); |
| Root_View := Root_Type (View); |
| |
| if Root_Typ = Root_View then |
| return True; |
| |
| -- An incomplete tagged type and its full view may receive two |
| -- distinct class-wide types when the related package has not |
| -- been analyzed yet. |
| |
| -- package Pack is |
| -- type T is tagged; -- CW_1 |
| -- type T is tagged null record; -- CW_2 |
| -- end Pack; |
| |
| -- This is because the package lacks any semantic information |
| -- that may eventually link both views of T. As a consequence, |
| -- a client of the limited view of Pack will see CW_2 while a |
| -- client of the non-limited view of Pack will see CW_1. |
| |
| elsif Is_Incomplete_Type (Root_Typ) |
| and then Present (Full_View (Root_Typ)) |
| and then Full_View (Root_Typ) = Root_View |
| then |
| return True; |
| |
| elsif Is_Incomplete_Type (Root_View) |
| and then Present (Full_View (Root_View)) |
| and then Full_View (Root_View) = Root_Typ |
| then |
| return True; |
| end if; |
| end if; |
| |
| return False; |
| end Is_Matching_Limited_View; |
| |
| -- Start of processing for Matches_Limited_With_View |
| |
| begin |
| -- In some cases a type imported through a limited_with clause, and |
| -- its non-limited view are both visible, for example in an anonymous |
| -- access-to-class-wide type in a formal, or when building the body |
| -- for a subprogram renaming after the subprogram has been frozen. |
| -- In these cases both entities designate the same type. In addition, |
| -- if one of them is an actual in an instance, it may be a subtype of |
| -- the non-limited view of the other. |
| |
| if From_Limited_With (Typ_1) |
| and then From_Limited_With (Typ_2) |
| and then Available_View (Typ_1) = Available_View (Typ_2) |
| then |
| return True; |
| |
| elsif From_Limited_With (Typ_1) then |
| return Is_Matching_Limited_View (Typ_2, Available_View (Typ_1)); |
| |
| elsif From_Limited_With (Typ_2) then |
| return Is_Matching_Limited_View (Typ_1, Available_View (Typ_2)); |
| |
| else |
| return False; |
| end if; |
| end Matches_Limited_With_View; |
| |
| -- Local variables |
| |
| Are_Anonymous_Access_To_Subprogram_Types : Boolean := False; |
| |
| Type_1 : Entity_Id := T1; |
| Type_2 : Entity_Id := T2; |
| |
| -- Start of processing for Conforming_Types |
| |
| begin |
| -- The context is an instance association for a formal access-to- |
| -- subprogram type; the formal parameter types require mapping because |
| -- they may denote other formal parameters of the generic unit. |
| |
| if Get_Inst then |
| Type_1 := Get_Instance_Of (T1); |
| Type_2 := Get_Instance_Of (T2); |
| end if; |
| |
| -- If one of the types is a view of the other introduced by a limited |
| -- with clause, treat these as conforming for all purposes. |
| |
| if Matches_Limited_With_View (T1, T2) then |
| return True; |
| |
| elsif Base_Types_Match (Type_1, Type_2) then |
| if Ctype <= Mode_Conformant then |
| return True; |
| |
| else |
| return |
| Subtypes_Statically_Match (Type_1, Type_2) |
| and then Dimensions_Match (Type_1, Type_2); |
| end if; |
| |
| elsif Is_Incomplete_Or_Private_Type (Type_1) |
| and then Present (Full_View (Type_1)) |
| and then Base_Types_Match (Full_View (Type_1), Type_2) |
| then |
| return |
| Ctype <= Mode_Conformant |
| or else Subtypes_Statically_Match (Full_View (Type_1), Type_2); |
| |
| elsif Ekind (Type_2) = E_Incomplete_Type |
| and then Present (Full_View (Type_2)) |
| and then Base_Types_Match (Type_1, Full_View (Type_2)) |
| then |
| return |
| Ctype <= Mode_Conformant |
| or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); |
| |
| elsif Is_Private_Type (Type_2) |
| and then In_Instance |
| and then Present (Full_View (Type_2)) |
| and then Base_Types_Match (Type_1, Full_View (Type_2)) |
| then |
| return |
| Ctype <= Mode_Conformant |
| or else Subtypes_Statically_Match (Type_1, Full_View (Type_2)); |
| |
| -- Another confusion between views in a nested instance with an |
| -- actual private type whose full view is not in scope. |
| |
| elsif Ekind (Type_2) = E_Private_Subtype |
| and then In_Instance |
| and then Etype (Type_2) = Type_1 |
| then |
| return True; |
| |
| -- In Ada 2012, incomplete types (including limited views) can appear |
| -- as actuals in instantiations, where they are conformant to the |
| -- corresponding incomplete formal. |
| |
| elsif Is_Incomplete_Type (Type_1) |
| and then Is_Incomplete_Type (Type_2) |
| and then In_Instance |
| and then (Used_As_Generic_Actual (Type_1) |
| or else Used_As_Generic_Actual (Type_2)) |
| then |
| return True; |
| end if; |
| |
| -- Ada 2005 (AI-254): Anonymous access-to-subprogram types must be |
| -- treated recursively because they carry a signature. As far as |
| -- conformance is concerned, convention plays no role, and either |
| -- or both could be access to protected subprograms. |
| |
| Are_Anonymous_Access_To_Subprogram_Types := |
| Ekind_In (Type_1, E_Anonymous_Access_Subprogram_Type, |
| E_Anonymous_Access_Protected_Subprogram_Type) |
| and then |
| Ekind_In (Type_2, E_Anonymous_Access_Subprogram_Type, |
| E_Anonymous_Access_Protected_Subprogram_Type); |
| |
| -- Test anonymous access type case. For this case, static subtype |
| -- matching is required for mode conformance (RM 6.3.1(15)). We check |
| -- the base types because we may have built internal subtype entities |
| -- to handle null-excluding types (see Process_Formals). |
| |
| if (Ekind (Base_Type (Type_1)) = E_Anonymous_Access_Type |
| and then |
| Ekind (Base_Type (Type_2)) = E_Anonymous_Access_Type) |
| |
| -- Ada 2005 (AI-254) |
| |
| or else Are_Anonymous_Access_To_Subprogram_Types |
| then |
| declare |
| Desig_1 : Entity_Id; |
| Desig_2 : Entity_Id; |
| |
| begin |
| -- In Ada 2005, access constant indicators must match for |
| -- subtype conformance. |
| |
| if Ada_Version >= Ada_2005 |
| and then Ctype >= Subtype_Conformant |
| and then |
| Is_Access_Constant (Type_1) /= Is_Access_Constant (Type_2) |
| then |
| return False; |
| end if; |
| |
| Desig_1 := Find_Designated_Type (Type_1); |
| Desig_2 := Find_Designated_Type (Type_2); |
| |
| -- If the context is an instance association for a formal |
| -- access-to-subprogram type; formal access parameter designated |
| -- types require mapping because they may denote other formal |
| -- parameters of the generic unit. |
| |
| if Get_Inst then |
| Desig_1 := Get_Instance_Of (Desig_1); |
| Desig_2 := Get_Instance_Of (Desig_2); |
| end if; |
| |
| -- It is possible for a Class_Wide_Type to be introduced for an |
| -- incomplete type, in which case there is a separate class_ wide |
| -- type for the full view. The types conform if their Etypes |
| -- conform, i.e. one may be the full view of the other. This can |
| -- only happen in the context of an access parameter, other uses |
| -- of an incomplete Class_Wide_Type are illegal. |
| |
| if Is_Class_Wide_Type (Desig_1) |
| and then |
| Is_Class_Wide_Type (Desig_2) |
| then |
| return |
| Conforming_Types |
| (Etype (Base_Type (Desig_1)), |
| Etype (Base_Type (Desig_2)), Ctype); |
| |
| elsif Are_Anonymous_Access_To_Subprogram_Types then |
| if Ada_Version < Ada_2005 then |
| return |
| Ctype = Type_Conformant |
| or else Subtypes_Statically_Match (Desig_1, Desig_2); |
| |
| -- We must check the conformance of the signatures themselves |
| |
| else |
| declare |
| Conformant : Boolean; |
| begin |
| Check_Conformance |
| (Desig_1, Desig_2, Ctype, False, Conformant); |
| return Conformant; |
| end; |
| end if; |
| |
| -- A limited view of an actual matches the corresponding |
| -- incomplete formal. |
| |
| elsif Ekind (Desig_2) = E_Incomplete_Subtype |
| and then From_Limited_With (Desig_2) |
| and then Used_As_Generic_Actual (Etype (Desig_2)) |
| then |
| return True; |
| |
| else |
| return Base_Type (Desig_1) = Base_Type (Desig_2) |
| and then (Ctype = Type_Conformant |
| or else |
| Subtypes_Statically_Match (Desig_1, Desig_2)); |
| end if; |
| end; |
| |
| -- Otherwise definitely no match |
| |
| else |
| if ((Ekind (Type_1) = E_Anonymous_Access_Type |
| and then Is_Access_Type (Type_2)) |
| or else (Ekind (Type_2) = E_Anonymous_Access_Type |
| and then Is_Access_Type (Type_1))) |
| and then |
| Conforming_Types |
| (Designated_Type (Type_1), Designated_Type (Type_2), Ctype) |
| then |
| May_Hide_Profile := True; |
| end if; |
| |
| return False; |
| end if; |
| end Conforming_Types; |
| |
| -------------------------- |
| -- Create_Extra_Formals -- |
| -------------------------- |
| |
| procedure Create_Extra_Formals (E : Entity_Id) is |
| First_Extra : Entity_Id := Empty; |
| Formal : Entity_Id; |
| Last_Extra : Entity_Id := Empty; |
| |
| function Add_Extra_Formal |
| (Assoc_Entity : Entity_Id; |
| Typ : Entity_Id; |
| Scope : Entity_Id; |
| Suffix : String) return Entity_Id; |
| -- Add an extra formal to the current list of formals and extra formals. |
| -- The extra formal is added to the end of the list of extra formals, |
| -- and also returned as the result. These formals are always of mode IN. |
| -- The new formal has the type Typ, is declared in Scope, and its name |
| -- is given by a concatenation of the name of Assoc_Entity and Suffix. |
| -- The following suffixes are currently used. They should not be changed |
| -- without coordinating with CodePeer, which makes use of these to |
| -- provide better messages. |
| |
| -- O denotes the Constrained bit. |
| -- L denotes the accessibility level. |
| -- BIP_xxx denotes an extra formal for a build-in-place function. See |
| -- the full list in exp_ch6.BIP_Formal_Kind. |
| |
| ---------------------- |
| -- Add_Extra_Formal -- |
| ---------------------- |
| |
| function Add_Extra_Formal |
| (Assoc_Entity : Entity_Id; |
| Typ : Entity_Id; |
| Scope : Entity_Id; |
| Suffix : String) return Entity_Id |
| is |
| EF : constant Entity_Id := |
| Make_Defining_Identifier (Sloc (Assoc_Entity), |
| Chars => New_External_Name (Chars (Assoc_Entity), |
| Suffix => Suffix)); |
| |
| begin |
| -- A little optimization. Never generate an extra formal for the |
| -- _init operand of an initialization procedure, since it could |
| -- never be used. |
| |
| if Chars (Formal) = Name_uInit then |
| return Empty; |
| end if; |
| |
| Set_Ekind (EF, E_In_Parameter); |
| Set_Actual_Subtype (EF, Typ); |
| Set_Etype (EF, Typ); |
| Set_Scope (EF, Scope); |
| Set_Mechanism (EF, Default_Mechanism); |
| Set_Formal_Validity (EF); |
| |
| if No (First_Extra) then |
| First_Extra := EF; |
| Set_Extra_Formals (Scope, EF); |
| end if; |
| |
| if Present (Last_Extra) then |
| Set_Extra_Formal (Last_Extra, EF); |
| end if; |
| |
| Last_Extra := EF; |
| |
| return EF; |
| end Add_Extra_Formal; |
| |
| -- Local variables |
| |
| Formal_Type : Entity_Id; |
| P_Formal : Entity_Id := Empty; |
| |
| -- Start of processing for Create_Extra_Formals |
| |
| begin |
| -- We never generate extra formals if expansion is not active because we |
| -- don't need them unless we are generating code. |
| |
| if not Expander_Active then |
| return; |
| end if; |
| |
| -- No need to generate extra formals in interface thunks whose target |
| -- primitive has no extra formals. |
| |
| if Is_Thunk (E) and then No (Extra_Formals (Thunk_Entity (E))) then |
| return; |
| end if; |
| |
| -- If this is a derived subprogram then the subtypes of the parent |
| -- subprogram's formal parameters will be used to determine the need |
| -- for extra formals. |
| |
| if Is_Overloadable (E) and then Present (Alias (E)) then |
| P_Formal := First_Formal (Alias (E)); |
| end if; |
| |
| Formal := First_Formal (E); |
| while Present (Formal) loop |
| Last_Extra := Formal; |
| Next_Formal (Formal); |
| end loop; |
| |
| -- If Extra_Formals were already created, don't do it again. This |
| -- situation may arise for subprogram types created as part of |
| -- dispatching calls (see Expand_Dispatching_Call). |
| |
| if Present (Last_Extra) and then Present (Extra_Formal (Last_Extra)) then |
| return; |
| end if; |
| |
| -- If the subprogram is a predefined dispatching subprogram then don't |
| -- generate any extra constrained or accessibility level formals. In |
| -- general we suppress these for internal subprograms (by not calling |
| -- Freeze_Subprogram and Create_Extra_Formals at all), but internally |
| -- generated stream attributes do get passed through because extra |
| -- build-in-place formals are needed in some cases (limited 'Input). |
| |
| if Is_Predefined_Internal_Operation (E) then |
| goto Test_For_Func_Result_Extras; |
| end if; |
| |
| Formal := First_Formal (E); |
| while Present (Formal) loop |
| |
| -- Create extra formal for supporting the attribute 'Constrained. |
| -- The case of a private type view without discriminants also |
| -- requires the extra formal if the underlying type has defaulted |
| -- discriminants. |
| |
| if Ekind (Formal) /= E_In_Parameter then |
| if Present (P_Formal) then |
| Formal_Type := Etype (P_Formal); |
| else |
| Formal_Type := Etype (Formal); |
| end if; |
| |
| -- Do not produce extra formals for Unchecked_Union parameters. |
| -- Jump directly to the end of the loop. |
| |
| if Is_Unchecked_Union (Base_Type (Formal_Type)) then |
| goto Skip_Extra_Formal_Generation; |
| end if; |
| |
| if not Has_Discriminants (Formal_Type) |
| and then Ekind (Formal_Type) in Private_Kind |
| and then Present (Underlying_Type (Formal_Type)) |
| then |
| Formal_Type := Underlying_Type (Formal_Type); |
| end if; |
| |
| -- Suppress the extra formal if formal's subtype is constrained or |
| -- indefinite, or we're compiling for Ada 2012 and the underlying |
| -- type is tagged and limited. In Ada 2012, a limited tagged type |
| -- can have defaulted discriminants, but 'Constrained is required |
| -- to return True, so the formal is never needed (see AI05-0214). |
| -- Note that this ensures consistency of calling sequences for |
| -- dispatching operations when some types in a class have defaults |
| -- on discriminants and others do not (and requiring the extra |
| -- formal would introduce distributed overhead). |
| |
| -- If the type does not have a completion yet, treat as prior to |
| -- Ada 2012 for consistency. |
| |
| if Has_Discriminants (Formal_Type) |
| and then not Is_Constrained (Formal_Type) |
| and then Is_Definite_Subtype (Formal_Type) |
| and then (Ada_Version < Ada_2012 |
| or else No (Underlying_Type (Formal_Type)) |
| or else not |
| (Is_Limited_Type (Formal_Type) |
| and then |
| (Is_Tagged_Type |
| (Underlying_Type (Formal_Type))))) |
| then |
| Set_Extra_Constrained |
| (Formal, Add_Extra_Formal (Formal, Standard_Boolean, E, "O")); |
| end if; |
| end if; |
| |
| -- Create extra formal for supporting accessibility checking. This |
| -- is done for both anonymous access formals and formals of named |
| -- access types that are marked as controlling formals. The latter |
| -- case can occur when Expand_Dispatching_Call creates a subprogram |
| -- type and substitutes the types of access-to-class-wide actuals |
| -- for the anonymous access-to-specific-type of controlling formals. |
| -- Base_Type is applied because in cases where there is a null |
| -- exclusion the formal may have an access subtype. |
| |
| -- This is suppressed if we specifically suppress accessibility |
| -- checks at the package level for either the subprogram, or the |
| -- package in which it resides. However, we do not suppress it |
| -- simply if the scope has accessibility checks suppressed, since |
| -- this could cause trouble when clients are compiled with a |
| -- different suppression setting. The explicit checks at the |
| -- package level are safe from this point of view. |
| |
| if (Ekind (Base_Type (Etype (Formal))) = E_Anonymous_Access_Type |
| or else (Is_Controlling_Formal (Formal) |
| and then Is_Access_Type (Base_Type (Etype (Formal))))) |
| and then not |
| (Explicit_Suppress (E, Accessibility_Check) |
| or else |
| Explicit_Suppress (Scope (E), Accessibility_Check)) |
| and then |
| (No (P_Formal) |
| or else Present (Extra_Accessibility (P_Formal))) |
| then |
| Set_Extra_Accessibility |
| (Formal, Add_Extra_Formal (Formal, Standard_Natural, E, "L")); |
| end if; |
| |
| -- This label is required when skipping extra formal generation for |
| -- Unchecked_Union parameters. |
| |
| <<Skip_Extra_Formal_Generation>> |
| |
| if Present (P_Formal) then |
| Next_Formal (P_Formal); |
| end if; |
| |
| Next_Formal (Formal); |
| end loop; |
| |
| <<Test_For_Func_Result_Extras>> |
| |
| -- Ada 2012 (AI05-234): "the accessibility level of the result of a |
| -- function call is ... determined by the point of call ...". |
| |
| if Needs_Result_Accessibility_Level (E) then |
| Set_Extra_Accessibility_Of_Result |
| (E, Add_Extra_Formal (E, Standard_Natural, E, "L")); |
| end if; |
| |
| -- Ada 2005 (AI-318-02): In the case of build-in-place functions, add |
| -- appropriate extra formals. See type Exp_Ch6.BIP_Formal_Kind. |
| |
| if Is_Build_In_Place_Function (E) then |
| declare |
| Result_Subt : constant Entity_Id := Etype (E); |
| Formal_Typ : Entity_Id; |
| Subp_Decl : Node_Id; |
| Discard : Entity_Id; |
| |
| begin |
| -- In the case of functions with unconstrained result subtypes, |
| -- add a 4-state formal indicating whether the return object is |
| -- allocated by the caller (1), or should be allocated by the |
| -- callee on the secondary stack (2), in the global heap (3), or |
| -- in a user-defined storage pool (4). For the moment we just use |
| -- Natural for the type of this formal. Note that this formal |
| -- isn't usually needed in the case where the result subtype is |
| -- constrained, but it is needed when the function has a tagged |
| -- result, because generally such functions can be called in a |
| -- dispatching context and such calls must be handled like calls |
| -- to a class-wide function. |
| |
| if Needs_BIP_Alloc_Form (E) then |
| Discard := |
| Add_Extra_Formal |
| (E, Standard_Natural, |
| E, BIP_Formal_Suffix (BIP_Alloc_Form)); |
| |
| -- Add BIP_Storage_Pool, in case BIP_Alloc_Form indicates to |
| -- use a user-defined pool. This formal is not added on |
| -- ZFP as those targets do not support pools. |
| |
| if RTE_Available (RE_Root_Storage_Pool_Ptr) then |
| Discard := |
| Add_Extra_Formal |
| (E, RTE (RE_Root_Storage_Pool_Ptr), |
| E, BIP_Formal_Suffix (BIP_Storage_Pool)); |
| end if; |
| end if; |
| |
| -- In the case of functions whose result type needs finalization, |
| -- add an extra formal which represents the finalization master. |
| |
| if Needs_BIP_Finalization_Master (E) then |
| Discard := |
| Add_Extra_Formal |
| (E, RTE (RE_Finalization_Master_Ptr), |
| E, BIP_Formal_Suffix (BIP_Finalization_Master)); |
| end if; |
| |
| -- When the result type contains tasks, add two extra formals: the |
| -- master of the tasks to be created, and the caller's activation |
| -- chain. |
| |
| if Needs_BIP_Task_Actuals (E) then |
| Discard := |
| Add_Extra_Formal |
| (E, RTE (RE_Master_Id), |
| E, BIP_Formal_Suffix (BIP_Task_Master)); |
| Discard := |
| Add_Extra_Formal |
| (E, RTE (RE_Activation_Chain_Access), |
| E, BIP_Formal_Suffix (BIP_Activation_Chain)); |
| end if; |
| |
| -- All build-in-place functions get an extra formal that will be |
| -- passed the address of the return object within the caller. |
| |
| Formal_Typ := |
| Create_Itype (E_Anonymous_Access_Type, E, Scope_Id => Scope (E)); |
| |
| -- Incomplete_View_From_Limited_With is needed here because |
| -- gigi gets confused if the designated type is the full view |
| -- coming from a limited-with'ed package. In the normal case, |
| -- (no limited with) Incomplete_View_From_Limited_With |
| -- returns Result_Subt. |
| |
| Set_Directly_Designated_Type |
| (Formal_Typ, Incomplete_View_From_Limited_With (Result_Subt)); |
| Set_Etype (Formal_Typ, Formal_Typ); |
| Set_Depends_On_Private |
| (Formal_Typ, Has_Private_Component (Formal_Typ)); |
| Set_Is_Public (Formal_Typ, Is_Public (Scope (Formal_Typ))); |
| Set_Is_Access_Constant (Formal_Typ, False); |
| |
| -- Ada 2005 (AI-50217): Propagate the attribute that indicates |
| -- the designated type comes from the limited view (for back-end |
| -- purposes). |
| |
| Set_From_Limited_With |
| (Formal_Typ, From_Limited_With (Result_Subt)); |
| |
| Layout_Type (Formal_Typ); |
| |
| -- Force the definition of the Itype in case of internal function |
| -- calls within the same or nested scope. |
| |
| if Is_Subprogram_Or_Generic_Subprogram (E) then |
| Subp_Decl := Parent (E); |
| |
| -- The insertion point for an Itype reference should be after |
| -- the unit declaration node of the subprogram. An exception |
| -- to this are inherited operations from a parent type in which |
| -- case the derived type acts as their parent. |
| |
| if Nkind_In (Subp_Decl, N_Function_Specification, |
| N_Procedure_Specification) |
| then |
| Subp_Decl := Parent (Subp_Decl); |
| end if; |
| |
| Build_Itype_Reference (Formal_Typ, Subp_Decl); |
| end if; |
| |
| Discard := |
| Add_Extra_Formal |
| (E, Formal_Typ, E, BIP_Formal_Suffix (BIP_Object_Access)); |
| end; |
| end if; |
| |
| -- If this is an instance of a generic, we need to have extra formals |
| -- for the Alias. |
| |
| if Is_Generic_Instance (E) and then Present (Alias (E)) then |
| Set_Extra_Formals (Alias (E), Extra_Formals (E)); |
| end if; |
| end Create_Extra_Formals; |
| |
| ----------------------------- |
| -- Enter_Overloaded_Entity -- |
| ----------------------------- |
| |
| procedure Enter_Overloaded_Entity (S : Entity_Id) is |
| function Matches_Predefined_Op return Boolean; |
| -- This returns an approximation of whether S matches a predefined |
| -- operator, based on the operator symbol, and the parameter and result |
| -- types. The rules are scattered throughout chapter 4 of the Ada RM. |
| |
| --------------------------- |
| -- Matches_Predefined_Op -- |
| --------------------------- |
| |
| function Matches_Predefined_Op return Boolean is |
| Formal_1 : constant Entity_Id := First_Formal (S); |
| Formal_2 : constant Entity_Id := Next_Formal (Formal_1); |
| Op : constant Name_Id := Chars (S); |
| Result_Type : constant Entity_Id := Base_Type (Etype (S)); |
| Type_1 : constant Entity_Id := Base_Type (Etype (Formal_1)); |
| |
| begin |
| -- Binary operator |
| |
| if Present (Formal_2) then |
| declare |
| Type_2 : constant Entity_Id := Base_Type (Etype (Formal_2)); |
| |
| begin |
| -- All but "&" and "**" have same-types parameters |
| |
| case Op is |
| when Name_Op_Concat |
| | Name_Op_Expon |
| => |
| null; |
| |
| when others => |
| if Type_1 /= Type_2 then |
| return False; |
| end if; |
| end case; |
| |
| -- Check parameter and result types |
| |
| case Op is |
| when Name_Op_And |
| | Name_Op_Or |
| | Name_Op_Xor |
| => |
| return |
| Is_Boolean_Type (Result_Type) |
| and then Result_Type = Type_1; |
| |
| when Name_Op_Mod |
| | Name_Op_Rem |
| => |
| return |
| Is_Integer_Type (Result_Type) |
| and then Result_Type = Type_1; |
| |
| when Name_Op_Add |
| | Name_Op_Divide |
| | Name_Op_Multiply |
| | Name_Op_Subtract |
| => |
| return |
| Is_Numeric_Type (Result_Type) |
| and then Result_Type = Type_1; |
| |
| when Name_Op_Eq |
| | Name_Op_Ne |
| => |
| return |
| Is_Boolean_Type (Result_Type) |
| and then not Is_Limited_Type (Type_1); |
| |
| when Name_Op_Ge |
| | Name_Op_Gt |
| | Name_Op_Le |
| | Name_Op_Lt |
| => |
| return |
| Is_Boolean_Type (Result_Type) |
| and then (Is_Array_Type (Type_1) |
| or else Is_Scalar_Type (Type_1)); |
| |
| when Name_Op_Concat => |
| return Is_Array_Type (Result_Type); |
| |
| when Name_Op_Expon => |
| return |
| (Is_Integer_Type (Result_Type) |
| or else Is_Floating_Point_Type (Result_Type)) |
| and then Result_Type = Type_1 |
| and then Type_2 = Standard_Integer; |
| |
| when others => |
| raise Program_Error; |
| end case; |
| end; |
| |
| -- Unary operator |
| |
| else |
| case Op is |
| when Name_Op_Abs |
| | Name_Op_Add |
| | Name_Op_Subtract |
| => |
| return |
| Is_Numeric_Type (Result_Type) |
| and then Result_Type = Type_1; |
| |
| when Name_Op_Not => |
| return |
| Is_Boolean_Type (Result_Type) |
| and then Result_Type = Type_1; |
| |
| when others => |
| raise Program_Error; |
| end case; |
| end if; |
| end Matches_Predefined_Op; |
| |
| -- Local variables |
| |
| E : Entity_Id := Current_Entity_In_Scope (S); |
| C_E : Entity_Id := Current_Entity (S); |
| |
| -- Start of processing for Enter_Overloaded_Entity |
| |
| begin |
| if Present (E) then |
| Set_Has_Homonym (E); |
| Set_Has_Homonym (S); |
| end if; |
| |
| Set_Is_Immediately_Visible (S); |
| Set_Scope (S, Current_Scope); |
| |
| -- Chain new entity if front of homonym in current scope, so that |
| -- homonyms are contiguous. |
| |
| if Present (E) and then E /= C_E then |
| while Homonym (C_E) /= E loop |
| C_E := Homonym (C_E); |
| end loop; |
| |
| Set_Homonym (C_E, S); |
| |
| else |
| E := C_E; |
| Set_Current_Entity (S); |
| end if; |
| |
| Set_Homonym (S, E); |
| |
| if Is_Inherited_Operation (S) then |
| Append_Inherited_Subprogram (S); |
| else |
| Append_Entity (S, Current_Scope); |
| end if; |
| |
| Set_Public_Status (S); |
| |
| if Debug_Flag_E then |
| Write_Str ("New overloaded entity chain: "); |
| Write_Name (Chars (S)); |
| |
| E := S; |
| while Present (E) loop |
| Write_Str (" "); Write_Int (Int (E)); |
| E := Homonym (E); |
| end loop; |
| |
| Write_Eol; |
| end if; |
| |
| -- Generate warning for hiding |
| |
| if Warn_On_Hiding |
| and then Comes_From_Source (S) |
| and then In_Extended_Main_Source_Unit (S) |
| then |
| E := S; |
| loop |
| E := Homonym (E); |
| exit when No (E); |
| |
| -- Warn unless genuine overloading. Do not emit warning on |
| -- hiding predefined operators in Standard (these are either an |
| -- (artifact of our implicit declarations, or simple noise) but |
| -- keep warning on a operator defined on a local subtype, because |
| -- of the real danger that different operators may be applied in |
| -- various parts of the program. |
| |
| -- Note that if E and S have the same scope, there is never any |
| -- hiding. Either the two conflict, and the program is illegal, |
| -- or S is overriding an implicit inherited subprogram. |
| |
| if Scope (E) /= Scope (S) |
| and then (not Is_Overloadable (E) |
| or else Subtype_Conformant (E, S)) |
| and then (Is_Immediately_Visible (E) |
| or else Is_Potentially_Use_Visible (S)) |
| then |
| if Scope (E) = Standard_Standard then |
| if Nkind (S) = N_Defining_Operator_Symbol |
| and then Scope (Base_Type (Etype (First_Formal (S)))) /= |
| Scope (S) |
| and then Matches_Predefined_Op |
| then |
| Error_Msg_N |
| ("declaration of & hides predefined operator?h?", S); |
| end if; |
| |
| -- E not immediately within Standard |
| |
| else |
| Error_Msg_Sloc := Sloc (E); |
| Error_Msg_N ("declaration of & hides one #?h?", S); |
| end if; |
| end if; |
| end loop; |
| end if; |
| end Enter_Overloaded_Entity; |
| |
| ----------------------------- |
| -- Check_Untagged_Equality -- |
| ----------------------------- |
| |
| procedure Check_Untagged_Equality (Eq_Op : Entity_Id) is |
| Typ : constant Entity_Id := Etype (First_Formal (Eq_Op)); |
| Decl : constant Node_Id := Unit_Declaration_Node (Eq_Op); |
| Obj_Decl : Node_Id; |
| |
| begin |
| -- This check applies only if we have a subprogram declaration with an |
| -- untagged record type that is conformant to the predefined op. |
| |
| if Nkind (Decl) /= N_Subprogram_Declaration |
| or else not Is_Record_Type (Typ) |
| or else Is_Tagged_Type (Typ) |
| or else Etype (Next_Formal (First_Formal (Eq_Op))) /= Typ |
| then |
| return; |
| end if; |
| |
| -- In Ada 2012 case, we will output errors or warnings depending on |
| -- the setting of debug flag -gnatd.E. |
| |
| if Ada_Version >= Ada_2012 then |
| Error_Msg_Warn := Debug_Flag_Dot_EE; |
| |
| -- In earlier versions of Ada, nothing to do unless we are warning on |
| -- Ada 2012 incompatibilities (Warn_On_Ada_2012_Incompatibility set). |
| |
| else |
| if not Warn_On_Ada_2012_Compatibility then |
| return; |
| end if; |
| end if; |
| |
| -- Cases where the type has already been frozen |
| |
| if Is_Frozen (Typ) then |
| |
| -- The check applies to a primitive operation, so check that type |
| -- and equality operation are in the same scope. |
| |
| if Scope (Typ) /= Current_Scope then |
| return; |
| |
| -- If the type is a generic actual (sub)type, the operation is not |
| -- primitive either because the base type is declared elsewhere. |
| |
| elsif Is_Generic_Actual_Type (Typ) then |
| return; |
| |
| -- Here we have a definite error of declaration after freezing |
| |
| else |
| if Ada_Version >= Ada_2012 then |
| Error_Msg_NE |
| ("equality operator must be declared before type & is " |
| & "frozen (RM 4.5.2 (9.8)) (Ada 2012)<<", Eq_Op, Typ); |
| |
| -- In Ada 2012 mode with error turned to warning, output one |
| -- more warning to warn that the equality operation may not |
| -- compose. This is the consequence of ignoring the error. |
| |
| if Error_Msg_Warn then |
| Error_Msg_N ("\equality operation may not compose??", Eq_Op); |
| end if; |
| |
| else |
| Error_Msg_NE |
| ("equality operator must be declared before type& is " |
| & "frozen (RM 4.5.2 (9.8)) (Ada 2012)?y?", Eq_Op, Typ); |
| end if; |
| |
| -- If we are in the package body, we could just move the |
| -- declaration to the package spec, so add a message saying that. |
| |
| if In_Package_Body (Scope (Typ)) then |
| if Ada_Version >= Ada_2012 then |
| Error_Msg_N |
| ("\move declaration to package spec<<", Eq_Op); |
| else |
| Error_Msg_N |
| ("\move declaration to package spec (Ada 2012)?y?", Eq_Op); |
| end if; |
| |
| -- Otherwise try to find the freezing point for better message. |
| |
| else |
| Obj_Decl := Next (Parent (Typ)); |
| while Present (Obj_Decl) and then Obj_Decl /= Decl loop |
| if Nkind (Obj_Decl) = N_Object_Declaration |
| and then Etype (Defining_Identifier (Obj_Decl)) = Typ |
| then |
| -- Freezing point, output warnings |
| |
| if Ada_Version >= Ada_2012 then |
| Error_Msg_NE |
| ("type& is frozen by declaration??", Obj_Decl, Typ); |
| Error_Msg_N |
| ("\an equality operator cannot be declared after " |
| & "this point??", |
| Obj_Decl); |
| else |
| Error_Msg_NE |
| ("type& is frozen by declaration (Ada 2012)?y?", |
| Obj_Decl, Typ); |
| Error_Msg_N |
| ("\an equality operator cannot be declared after " |
| & "this point (Ada 2012)?y?", |
| Obj_Decl); |
| end if; |
| |
| exit; |
| |
| -- If we reach generated code for subprogram declaration |
| -- or body, it is the body that froze the type and the |
| -- declaration is legal. |
| |
| elsif Sloc (Obj_Decl) = Sloc (Decl) then |
| return; |
| end if; |
| |
| Next (Obj_Decl); |
| end loop; |
| end if; |
| end if; |
| |
| -- Here if type is not frozen yet. It is illegal to have a primitive |
| -- equality declared in the private part if the type is visible. |
| |
| elsif not In_Same_List (Parent (Typ), Decl) |
| and then not Is_Limited_Type (Typ) |
| then |
| -- Shouldn't we give an RM reference here??? |
| |
| if Ada_Version >= Ada_2012 then |
| Error_Msg_N |
| ("equality operator appears too late<<", Eq_Op); |
| else |
| Error_Msg_N |
| ("equality operator appears too late (Ada 2012)?y?", Eq_Op); |
| end if; |
| |
| -- No error detected |
| |
| else |
| return; |
| end if; |
| end Check_Untagged_Equality; |
| |
| ----------------------------- |
| -- Find_Corresponding_Spec -- |
| ----------------------------- |
| |
| function Find_Corresponding_Spec |
| (N : Node_Id; |
| Post_Error : Boolean := True) return Entity_Id |
| is |
| Spec : constant Node_Id := Specification (N); |
| Designator : constant Entity_Id := Defining_Entity (Spec); |
| |
| E : Entity_Id; |
| |
| function Different_Generic_Profile (E : Entity_Id) return Boolean; |
| -- Even if fully conformant, a body may depend on a generic actual when |
| -- the spec does not, or vice versa, in which case they were distinct |
| -- entities in the generic. |
| |
| ------------------------------- |
| -- Different_Generic_Profile -- |
| ------------------------------- |
| |
| function Different_Generic_Profile (E : Entity_Id) return Boolean is |
| F1, F2 : Entity_Id; |
| |
| function Same_Generic_Actual (T1, T2 : Entity_Id) return Boolean; |
| -- Check that the types of corresponding formals have the same |
| -- generic actual if any. We have to account for subtypes of a |
| -- generic formal, declared between a spec and a body, which may |
| -- appear distinct in an instance but matched in the generic, and |
| -- the subtype may be used either in the spec or the body of the |
| -- subprogram being checked. |
| |
| ------------------------- |
| -- Same_Generic_Actual -- |
| ------------------------- |
| |
| function Same_Generic_Actual (T1, T2 : Entity_Id) return Boolean is |
| |
| function Is_Declared_Subtype (S1, S2 : Entity_Id) return Boolean; |
| -- Predicate to check whether S1 is a subtype of S2 in the source |
| -- of the instance. |
| |
| ------------------------- |
| -- Is_Declared_Subtype -- |
| ------------------------- |
| |
| function Is_Declared_Subtype (S1, S2 : Entity_Id) return Boolean is |
| begin |
| return Comes_From_Source (Parent (S1)) |
| and then Nkind (Parent (S1)) = N_Subtype_Declaration |
| and then Is_Entity_Name (Subtype_Indication (Parent (S1))) |
| and then Entity (Subtype_Indication (Parent (S1))) = S2; |
| end Is_Declared_Subtype; |
| |
| -- Start of processing for Same_Generic_Actual |
| |
| begin |
| return Is_Generic_Actual_Type (T1) = Is_Generic_Actual_Type (T2) |
| or else Is_Declared_Subtype (T1, T2) |
| or else Is_Declared_Subtype (T2, T1); |
| end Same_Generic_Actual; |
| |
| -- Start of processing for Different_Generic_Profile |
| |
| begin |
| if not In_Instance then |
| return False; |
| |
| elsif Ekind (E) = E_Function |
| and then not Same_Generic_Actual (Etype (E), Etype (Designator)) |
| then |
| return True; |
| end if; |
| |
| F1 := First_Formal (Designator); |
| F2 := First_Formal (E); |
| while Present (F1) loop |
| if not Same_Generic_Actual (Etype (F1), Etype (F2)) then |
| return True; |
| end if; |
| |
| Next_Formal (F1); |
| Next_Formal (F2); |
| end loop; |
| |
| return False; |
| end Different_Generic_Profile; |
| |
| -- Start of processing for Find_Corresponding_Spec |
| |
| begin |
| E := Current_Entity (Designator); |
| while Present (E) loop |
| |
| -- We are looking for a matching spec. It must have the same scope, |
| -- and the same name, and either be type conformant, or be the case |
| -- of a library procedure spec and its body (which belong to one |
| -- another regardless of whether they are type conformant or not). |
| |
| if Scope (E) = Current_Scope then |
| if Current_Scope = Standard_Standard |
| or else (Ekind (E) = Ekind (Designator) |
| and then Type_Conformant (E, Designator)) |
| then |
| -- Within an instantiation, we know that spec and body are |
| -- subtype conformant, because they were subtype conformant in |
| -- the generic. We choose the subtype-conformant entity here as |
| -- well, to resolve spurious ambiguities in the instance that |
| -- were not present in the generic (i.e. when two different |
| -- types are given the same actual). If we are looking for a |
| -- spec to match a body, full conformance is expected. |
| |
| if In_Instance then |
| |
| -- Inherit the convention and "ghostness" of the matching |
| -- spec to ensure proper full and subtype conformance. |
| |
| Set_Convention (Designator, Convention (E)); |
| |
| -- Skip past subprogram bodies and subprogram renamings that |
| -- may appear to have a matching spec, but that aren't fully |
| -- conformant with it. That can occur in cases where an |
| -- actual type causes unrelated homographs in the instance. |
| |
| if Nkind_In (N, N_Subprogram_Body, |
| N_Subprogram_Renaming_Declaration) |
| and then Present (Homonym (E)) |
| and then not Fully_Conformant (Designator, E) |
| then |
| goto Next_Entity; |
| |
| elsif not Subtype_Conformant (Designator, E) then |
| goto Next_Entity; |
| |
| elsif Different_Generic_Profile (E) then |
| goto Next_Entity; |
| end if; |
| end if; |
| |
| -- Ada 2012 (AI05-0165): For internally generated bodies of |
| -- null procedures locate the internally generated spec. We |
| -- enforce mode conformance since a tagged type may inherit |
| -- from interfaces several null primitives which differ only |
| -- in the mode of the formals. |
| |
| if not (Comes_From_Source (E)) |
| and then Is_Null_Procedure (E) |
| and then not Mode_Conformant (Designator, E) |
| then |
| null; |
| |
| -- For null procedures coming from source that are completions, |
| -- analysis of the generated body will establish the link. |
| |
| elsif Comes_From_Source (E) |
| and then Nkind (Spec) = N_Procedure_Specification |
| and then Null_Present (Spec) |
| then |
| return E; |
| |
| -- Expression functions can be completions, but cannot be |
| -- completed by an explicit body. |
| |
| elsif Comes_From_Source (E) |
| and then Comes_From_Source (N) |
| and then Nkind (N) = N_Subprogram_Body |
| and then Nkind (Original_Node (Unit_Declaration_Node (E))) = |
| N_Expression_Function |
| then |
| Error_Msg_Sloc := Sloc (E); |
| Error_Msg_N ("body conflicts with expression function#", N); |
| return Empty; |
| |
| elsif not Has_Completion (E) then |
| if Nkind (N) /= N_Subprogram_Body_Stub then |
| Set_Corresponding_Spec (N, E); |
| end if; |
| |
| Set_Has_Completion (E); |
| return E; |
| |
| elsif Nkind (Parent (N)) = N_Subunit then |
| |
| -- If this is the proper body of a subunit, the completion |
| -- flag is set when analyzing the stub. |
| |
| return E; |
| |
| -- If E is an internal function with a controlling result that |
| -- was created for an operation inherited by a null extension, |
| -- it may be overridden by a body without a previous spec (one |
| -- more reason why these should be shunned). In that case we |
| -- remove the generated body if present, because the current |
| -- one is the explicit overriding. |
| |
| elsif Ekind (E) = E_Function |
| and then Ada_Version >= Ada_2005 |
| and then not Comes_From_Source (E) |
| and then Has_Controlling_Result (E) |
| and then Is_Null_Extension (Etype (E)) |
| and then Comes_From_Source (Spec) |
| then |
| Set_Has_Completion (E, False); |
| |
| if Expander_Active |
| and then Nkind (Parent (E)) = N_Function_Specification |
| then |
| Remove |
| (Unit_Declaration_Node |
| (Corresponding_Body (Unit_Declaration_Node (E)))); |
| |
| return E; |
| |
| -- If expansion is disabled, or if the wrapper function has |
| -- not been generated yet, this a late body overriding an |
| -- inherited operation, or it is an overriding by some other |
| -- declaration before the controlling result is frozen. In |
| -- either case this is a declaration of a new entity. |
| |
| else |
| return Empty; |
| end if; |
| |
| -- If the body already exists, then this is an error unless |
| -- the previous declaration is the implicit declaration of a |
| -- derived subprogram. It is also legal for an instance to |
| -- contain type conformant overloadable declarations (but the |
| -- generic declaration may not), per 8.3(26/2). |
| |
| elsif No (Alias (E)) |
| and then not Is_Intrinsic_Subprogram (E) |
| and then not In_Instance |
| and then Post_Error |
| then |
| Error_Msg_Sloc := Sloc (E); |
| |
| if Is_Imported (E) then |
| Error_Msg_NE |
| ("body not allowed for imported subprogram & declared#", |
| N, E); |
| else |
| Error_Msg_NE ("duplicate body for & declared#", N, E); |
| end if; |
| end if; |
| |
| -- Child units cannot be overloaded, so a conformance mismatch |
| -- between body and a previous spec is an error. |
| |
| elsif Is_Child_Unit (E) |
| and then |
| Nkind (Unit_Declaration_Node (Designator)) = N_Subprogram_Body |
| and then |
| Nkind (Parent (Unit_Declaration_Node (Designator))) = |
| N_Compilation_Unit |
| and then Post_Error |
| then |
| Error_Msg_N |
| ("body of child unit does not match previous declaration", N); |
| end if; |
| end if; |
| |
| <<Next_Entity>> |
| E := Homonym (E); |
| end loop; |
| |
| -- On exit, we know that no previous declaration of subprogram exists |
| |
| return Empty; |
| end Find_Corresponding_Spec; |
| |
| ---------------------- |
| -- Fully_Conformant -- |
| ---------------------- |
| |
| function Fully_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is |
| Result : Boolean; |
| begin |
| Check_Conformance (New_Id, Old_Id, Fully_Conformant, False, Result); |
| return Result; |
| end Fully_Conformant; |
| |
| ---------------------------------- |
| -- Fully_Conformant_Expressions -- |
| ---------------------------------- |
| |
| function Fully_Conformant_Expressions |
| (Given_E1 : Node_Id; |
| Given_E2 : Node_Id; |
| Report : Boolean := False) return Boolean |
| is |
| E1 : constant Node_Id := Original_Node (Given_E1); |
| E2 : constant Node_Id := Original_Node (Given_E2); |
| -- We always test conformance on original nodes, since it is possible |
| -- for analysis and/or expansion to make things look as though they |
| -- conform when they do not, e.g. by converting 1+2 into 3. |
| |
| function FCE (Given_E1 : Node_Id; Given_E2 : Node_Id) return Boolean; |
| -- ??? |
| |
| function FCL (L1 : List_Id; L2 : List_Id) return Boolean; |
| -- Compare elements of two lists for conformance. Elements have to be |
| -- conformant, and actuals inserted as default parameters do not match |
| -- explicit actuals with the same value. |
| |
| function FCO (Op_Node : Node_Id; Call_Node : Node_Id) return Boolean; |
| -- Compare an operator node with a function call |
| |
| --------- |
| -- FCE -- |
| --------- |
| |
| function FCE (Given_E1 : Node_Id; Given_E2 : Node_Id) return Boolean is |
| begin |
| return Fully_Conformant_Expressions (Given_E1, Given_E2, Report); |
| end FCE; |
| |
| --------- |
| -- FCL -- |
| --------- |
| |
| function FCL (L1 : List_Id; L2 : List_Id) return Boolean is |
| N1 : Node_Id; |
| N2 : Node_Id; |
| |
| begin |
| if L1 = No_List then |
| N1 := Empty; |
| else |
| N1 := First (L1); |
| end if; |
| |
| if L2 = No_List then |
| N2 := Empty; |
| else |
| N2 := First (L2); |
| end if; |
| |
| -- Compare two lists, skipping rewrite insertions (we want to compare |
| -- the original trees, not the expanded versions). |
| |
| loop |
| if Is_Rewrite_Insertion (N1) then |
| Next (N1); |
| elsif Is_Rewrite_Insertion (N2) then |
| Next (N2); |
| elsif No (N1) then |
| return No (N2); |
| elsif No (N2) then |
| return False; |
| elsif not FCE (N1, N2) then |
| return False; |
| else |
| Next (N1); |
| Next (N2); |
| end if; |
| end loop; |
| end FCL; |
| |
| --------- |
| -- FCO -- |
| --------- |
| |
| function FCO (Op_Node : Node_Id; Call_Node : Node_Id) return Boolean is |
| Actuals : constant List_Id := Parameter_Associations (Call_Node); |
| Act : Node_Id; |
| |
| begin |
| if No (Actuals) |
| or else Entity (Op_Node) /= Entity (Name (Call_Node)) |
| then |
| return False; |
| |
| else |
| Act := First (Actuals); |
| |
| if Nkind (Op_Node) in N_Binary_Op then |
| if not FCE (Left_Opnd (Op_Node), Act) then |
| return False; |
| end if; |
| |
| Next (Act); |
| end if; |
| |
| return Present (Act) |
| and then FCE (Right_Opnd (Op_Node), Act) |
| and then No (Next (Act)); |
| end if; |
| end FCO; |
| |
| -- Local variables |
| |
| Result : Boolean; |
| |
| -- Start of processing for Fully_Conformant_Expressions |
| |
| begin |
| Result := True; |
| |
| -- Nonconformant if paren count does not match. Note: if some idiot |
| -- complains that we don't do this right for more than 3 levels of |
| -- parentheses, they will be treated with the respect they deserve. |
| |
| if Paren_Count (E1) /= Paren_Count (E2) then |
| return False; |
| |
| -- If same entities are referenced, then they are conformant even if |
| -- they have different forms (RM 8.3.1(19-20)). |
| |
| elsif Is_Entity_Name (E1) and then Is_Entity_Name (E2) then |
| if Present (Entity (E1)) then |
| Result := Entity (E1) = Entity (E2) |
| |
| -- One may be a discriminant that has been replaced by the |
| -- corresponding discriminal. |
| |
| or else |
| (Chars (Entity (E1)) = Chars (Entity (E2)) |
| and then Ekind (Entity (E1)) = E_Discriminant |
| and then Ekind (Entity (E2)) = E_In_Parameter) |
| |
| -- The discriminant of a protected type is transformed into |
| -- a local constant and then into a parameter of a protected |
| -- operation. |
| |
| or else |
| (Ekind (Entity (E1)) = E_Constant |
| and then Ekind (Entity (E2)) = E_In_Parameter |
| and then Present (Discriminal_Link (Entity (E1))) |
| and then Discriminal_Link (Entity (E1)) = |
| Discriminal_Link (Entity (E2))) |
| |
| -- AI12-050: The loop variables of quantified expressions match |
| -- if they have the same identifier, even though they may have |
| -- different entities. |
| |
| or else |
| (Chars (Entity (E1)) = Chars (Entity (E2)) |
| and then Ekind (Entity (E1)) = E_Loop_Parameter |
| and then Ekind (Entity (E2)) = E_Loop_Parameter) |
| |
| -- A call to an instantiation of Unchecked_Conversion is |
| -- rewritten with the name of the generated function created for |
| -- the instance, and this must be special-cased. |
| |
| or else |
| (Ekind (Entity (E1)) = E_Function |
| and then Is_Intrinsic_Subprogram (Entity (E1)) |
| and then Is_Generic_Instance (Entity (E1)) |
| and then Entity (E2) = Alias (Entity (E1))); |
| if Report and not Result then |
| Error_Msg_Sloc := |
| Text_Ptr'Max (Sloc (Entity (E1)), Sloc (Entity (E2))); |
| Error_Msg_NE |
| ("Meaning of& differs because of declaration#", E1, E2); |
| end if; |
| |
| return Result; |
| |
| elsif Nkind (E1) = N_Expanded_Name |
| and then Nkind (E2) = N_Expanded_Name |
| and then Nkind (Selector_Name (E1)) = N_Character_Literal |
| and then Nkind (Selector_Name (E2)) = N_Character_Literal |
| then |
| return Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)); |
| |
| else |
| -- Identifiers in component associations don't always have |
| -- entities, but their names must conform. |
| |
| return Nkind (E1) = N_Identifier |
| and then Nkind (E2) = N_Identifier |
| and then Chars (E1) = Chars (E2); |
| end if; |
| |
| elsif Nkind (E1) = N_Character_Literal |
| and then Nkind (E2) = N_Expanded_Name |
| then |
| return Nkind (Selector_Name (E2)) = N_Character_Literal |
| and then Chars (E1) = Chars (Selector_Name (E2)); |
| |
| elsif Nkind (E2) = N_Character_Literal |
| and then Nkind (E1) = N_Expanded_Name |
| then |
| return Nkind (Selector_Name (E1)) = N_Character_Literal |
| and then Chars (E2) = Chars (Selector_Name (E1)); |
| |
| elsif Nkind (E1) in N_Op and then Nkind (E2) = N_Function_Call then |
| return FCO (E1, E2); |
| |
| elsif Nkind (E2) in N_Op and then Nkind (E1) = N_Function_Call then |
| return FCO (E2, E1); |
| |
| -- Otherwise we must have the same syntactic entity |
| |
| elsif Nkind (E1) /= Nkind (E2) then |
| return False; |
| |
| -- At this point, we specialize by node type |
| |
| else |
| case Nkind (E1) is |
| when N_Aggregate => |
| return |
| FCL (Expressions (E1), Expressions (E2)) |
| and then |
| FCL (Component_Associations (E1), |
| Component_Associations (E2)); |
| |
| when N_Allocator => |
| if Nkind (Expression (E1)) = N_Qualified_Expression |
| or else |
| Nkind (Expression (E2)) = N_Qualified_Expression |
| then |
| return FCE (Expression (E1), Expression (E2)); |
| |
| -- Check that the subtype marks and any constraints |
| -- are conformant |
| |
| else |
| declare |
| Indic1 : constant Node_Id := Expression (E1); |
| Indic2 : constant Node_Id := Expression (E2); |
| Elt1 : Node_Id; |
| Elt2 : Node_Id; |
| |
| begin |
| if Nkind (Indic1) /= N_Subtype_Indication then |
| return |
| Nkind (Indic2) /= N_Subtype_Indication |
| and then Entity (Indic1) = Entity (Indic2); |
| |
| elsif Nkind (Indic2) /= N_Subtype_Indication then |
| return |
| Nkind (Indic1) /= N_Subtype_Indication |
| and then Entity (Indic1) = Entity (Indic2); |
| |
| else |
| if Entity (Subtype_Mark (Indic1)) /= |
| Entity (Subtype_Mark (Indic2)) |
| then |
| return False; |
| end if; |
| |
| Elt1 := First (Constraints (Constraint (Indic1))); |
| Elt2 := First (Constraints (Constraint (Indic2))); |
| while Present (Elt1) and then Present (Elt2) loop |
| if not FCE (Elt1, Elt2) then |
| return False; |
| end if; |
| |
| Next (Elt1); |
| Next (Elt2); |
| end loop; |
| |
| return True; |
| end if; |
| end; |
| end if; |
| |
| when N_Attribute_Reference => |
| return |
| Attribute_Name (E1) = Attribute_Name (E2) |
| and then FCL (Expressions (E1), Expressions (E2)); |
| |
| when N_Binary_Op => |
| return |
| Entity (E1) = Entity (E2) |
| and then FCE (Left_Opnd (E1), Left_Opnd (E2)) |
| and then FCE (Right_Opnd (E1), Right_Opnd (E2)); |
| |
| when N_Membership_Test |
| | N_Short_Circuit |
| => |
| return |
| FCE (Left_Opnd (E1), Left_Opnd (E2)) |
| and then |
| FCE (Right_Opnd (E1), Right_Opnd (E2)); |
| |
| when N_Case_Expression => |
| declare |
| Alt1 : Node_Id; |
| Alt2 : Node_Id; |
| |
| begin |
| if not FCE (Expression (E1), Expression (E2)) then |
| return False; |
| |
| else |
| Alt1 := First (Alternatives (E1)); |
| Alt2 := First (Alternatives (E2)); |
| loop |
| if Present (Alt1) /= Present (Alt2) then |
| return False; |
| elsif No (Alt1) then |
| return True; |
| end if; |
| |
| if not FCE (Expression (Alt1), Expression (Alt2)) |
| or else not FCL (Discrete_Choices (Alt1), |
| Discrete_Choices (Alt2)) |
| then |
| return False; |
| end if; |
| |
| Next (Alt1); |
| Next (Alt2); |
| end loop; |
| end if; |
| end; |
| |
| when N_Character_Literal => |
| return |
| Char_Literal_Value (E1) = Char_Literal_Value (E2); |
| |
| when N_Component_Association => |
| return |
| FCL (Choices (E1), Choices (E2)) |
| and then |
| FCE (Expression (E1), Expression (E2)); |
| |
| when N_Explicit_Dereference => |
| return |
| FCE (Prefix (E1), Prefix (E2)); |
| |
| when N_Extension_Aggregate => |
| return |
| FCL (Expressions (E1), Expressions (E2)) |
| and then Null_Record_Present (E1) = |
| Null_Record_Present (E2) |
| and then FCL (Component_Associations (E1), |
| Component_Associations (E2)); |
| |
| when N_Function_Call => |
| return |
| FCE (Name (E1), Name (E2)) |
| and then |
| FCL (Parameter_Associations (E1), |
| Parameter_Associations (E2)); |
| |
| when N_If_Expression => |
| return |
| FCL (Expressions (E1), Expressions (E2)); |
| |
| when N_Indexed_Component => |
| return |
| FCE (Prefix (E1), Prefix (E2)) |
| and then |
| FCL (Expressions (E1), Expressions (E2)); |
| |
| when N_Integer_Literal => |
| return (Intval (E1) = Intval (E2)); |
| |
| when N_Null => |
| return True; |
| |
| when N_Operator_Symbol => |
| return |
| Chars (E1) = Chars (E2); |
| |
| when N_Others_Choice => |
| return True; |
| |
| when N_Parameter_Association => |
| return |
| Chars (Selector_Name (E1)) = Chars (Selector_Name (E2)) |
| and then FCE (Explicit_Actual_Parameter (E1), |
| Explicit_Actual_Parameter (E2)); |
| |
| when N_Qualified_Expression |
| | N_Type_Conversion |
| | N_Unchecked_Type_Conversion |
| => |
| return |
| FCE (Subtype_Mark (E1), Subtype_Mark (E2)) |
| and then |
| FCE (Expression (E1), Expression (E2)); |
| |
| when N_Quantified_Expression => |
| if not FCE (Condition (E1), Condition (E2)) then |
| return False; |
| end if; |
| |
| if Present (Loop_Parameter_Specification (E1)) |
| and then Present (Loop_Parameter_Specification (E2)) |
| then |
| declare |
| L1 : constant Node_Id := |
| Loop_Parameter_Specification (E1); |
| L2 : constant Node_Id := |
| Loop_Parameter_Specification (E2); |
| |
| begin |
| return |
| Reverse_Present (L1) = Reverse_Present (L2) |
| and then |
| FCE (Defining_Identifier (L1), |
| Defining_Identifier (L2)) |
| and then |
| FCE (Discrete_Subtype_Definition (L1), |
| Discrete_Subtype_Definition (L2)); |
| end; |
| |
| elsif Present (Iterator_Specification (E1)) |
| and then Present (Iterator_Specification (E2)) |
| then |
| declare |
| I1 : constant Node_Id := Iterator_Specification (E1); |
| I2 : constant Node_Id := Iterator_Specification (E2); |
| |
| begin |
| return |
| FCE (Defining_Identifier (I1), |
| Defining_Identifier (I2)) |
| and then |
| Of_Present (I1) = Of_Present (I2) |
| and then |
| Reverse_Present (I1) = Reverse_Present (I2) |
| and then FCE (Name (I1), Name (I2)) |
| and then FCE (Subtype_Indication (I1), |
| Subtype_Indication (I2)); |
| end; |
| |
| -- The quantified expressions used different specifications to |
| -- walk their respective ranges. |
| |
| else |
| return False; |
| end if; |
| |
| when N_Range => |
| return |
| FCE (Low_Bound (E1), Low_Bound (E2)) |
| and then |
| FCE (High_Bound (E1), High_Bound (E2)); |
| |
| when N_Real_Literal => |
| return (Realval (E1) = Realval (E2)); |
| |
| when N_Selected_Component => |
| return |
| FCE (Prefix (E1), Prefix (E2)) |
| and then |
| FCE (Selector_Name (E1), Selector_Name (E2)); |
| |
| when N_Slice => |
| return |
| FCE (Prefix (E1), Prefix (E2)) |
| and then |
| FCE (Discrete_Range (E1), Discrete_Range (E2)); |
| |
| when N_String_Literal => |
| declare |
| S1 : constant String_Id := Strval (E1); |
| S2 : constant String_Id := Strval (E2); |
| L1 : constant Nat := String_Length (S1); |
| L2 : constant Nat := String_Length (S2); |
| |
| begin |
| if L1 /= L2 then |
| return False; |
| |
| else |
| for J in 1 .. L1 loop |
| if Get_String_Char (S1, J) /= |
| Get_String_Char (S2, J) |
| then |
| return False; |
| end if; |
| end loop; |
| |
| return True; |
| end if; |
| end; |
| |
| when N_Unary_Op => |
| return |
| Entity (E1) = Entity (E2) |
| and then |
| FCE (Right_Opnd (E1), Right_Opnd (E2)); |
| |
| -- All other node types cannot appear in this context. Strictly |
| -- we should raise a fatal internal error. Instead we just ignore |
| -- the nodes. This means that if anyone makes a mistake in the |
| -- expander and mucks an expression tree irretrievably, the result |
| -- will be a failure to detect a (probably very obscure) case |
| -- of non-conformance, which is better than bombing on some |
| -- case where two expressions do in fact conform. |
| |
| when others => |
| return True; |
| end case; |
| end if; |
| end Fully_Conformant_Expressions; |
| |
| ---------------------------------------- |
| -- Fully_Conformant_Discrete_Subtypes -- |
| ---------------------------------------- |
| |
| function Fully_Conformant_Discrete_Subtypes |
| (Given_S1 : Node_Id; |
| Given_S2 : Node_Id) return Boolean |
| is |
| S1 : constant Node_Id := Original_Node (Given_S1); |
| S2 : constant Node_Id := Original_Node (Given_S2); |
| |
| function Conforming_Bounds (B1, B2 : Node_Id) return Boolean; |
| -- Special-case for a bound given by a discriminant, which in the body |
| -- is replaced with the discriminal of the enclosing type. |
| |
| function Conforming_Ranges (R1, R2 : Node_Id) return Boolean; |
| -- Check both bounds |
| |
| ----------------------- |
| -- Conforming_Bounds -- |
| ----------------------- |
| |
| function Conforming_Bounds (B1, B2 : Node_Id) return Boolean is |
| begin |
| if Is_Entity_Name (B1) |
| and then Is_Entity_Name (B2) |
| and then Ekind (Entity (B1)) = E_Discriminant |
| then |
| return Chars (B1) = Chars (B2); |
| |
| else |
| return Fully_Conformant_Expressions (B1, B2); |
| end if; |
| end Conforming_Bounds; |
| |
| ----------------------- |
| -- Conforming_Ranges -- |
| ----------------------- |
| |
| function Conforming_Ranges (R1, R2 : Node_Id) return Boolean is |
| begin |
| return |
| Conforming_Bounds (Low_Bound (R1), Low_Bound (R2)) |
| and then |
| Conforming_Bounds (High_Bound (R1), High_Bound (R2)); |
| end Conforming_Ranges; |
| |
| -- Start of processing for Fully_Conformant_Discrete_Subtypes |
| |
| begin |
| if Nkind (S1) /= Nkind (S2) then |
| return False; |
| |
| elsif Is_Entity_Name (S1) then |
| return Entity (S1) = Entity (S2); |
| |
| elsif Nkind (S1) = N_Range then |
| return Conforming_Ranges (S1, S2); |
| |
| elsif Nkind (S1) = N_Subtype_Indication then |
| return |
| Entity (Subtype_Mark (S1)) = Entity (Subtype_Mark (S2)) |
| and then |
| Conforming_Ranges |
| (Range_Expression (Constraint (S1)), |
| Range_Expression (Constraint (S2))); |
| else |
| return True; |
| end if; |
| end Fully_Conformant_Discrete_Subtypes; |
| |
| -------------------- |
| -- Install_Entity -- |
| -------------------- |
| |
| procedure Install_Entity (E : Entity_Id) is |
| Prev : constant Entity_Id := Current_Entity (E); |
| begin |
| Set_Is_Immediately_Visible (E); |
| Set_Current_Entity (E); |
| Set_Homonym (E, Prev); |
| end Install_Entity; |
| |
| --------------------- |
| -- Install_Formals -- |
| --------------------- |
| |
| procedure Install_Formals (Id : Entity_Id) is |
| F : Entity_Id; |
| begin |
| F := First_Formal (Id); |
| while Present (F) loop |
| Install_Entity (F); |
| Next_Formal (F); |
| end loop; |
| end Install_Formals; |
| |
| ----------------------------- |
| -- Is_Interface_Conformant -- |
| ----------------------------- |
| |
| function Is_Interface_Conformant |
| (Tagged_Type : Entity_Id; |
| Iface_Prim : Entity_Id; |
| Prim : Entity_Id) return Boolean |
| is |
| -- The operation may in fact be an inherited (implicit) operation |
| -- rather than the original interface primitive, so retrieve the |
| -- ultimate ancestor. |
| |
| Iface : constant Entity_Id := |
| Find_Dispatching_Type (Ultimate_Alias (Iface_Prim)); |
| Typ : constant Entity_Id := Find_Dispatching_Type (Prim); |
| |
| function Controlling_Formal (Prim : Entity_Id) return Entity_Id; |
| -- Return the controlling formal of Prim |
| |
| ------------------------ |
| -- Controlling_Formal -- |
| ------------------------ |
| |
| function Controlling_Formal (Prim : Entity_Id) return Entity_Id is |
| E : Entity_Id; |
| |
| begin |
| E := First_Entity (Prim); |
| while Present (E) loop |
| if Is_Formal (E) and then Is_Controlling_Formal (E) then |
| return E; |
| end if; |
| |
| Next_Entity (E); |
| end loop; |
| |
| return Empty; |
| end Controlling_Formal; |
| |
| -- Local variables |
| |
| Iface_Ctrl_F : constant Entity_Id := Controlling_Formal (Iface_Prim); |
| Prim_Ctrl_F : constant Entity_Id := Controlling_Formal (Prim); |
| |
| -- Start of processing for Is_Interface_Conformant |
| |
| begin |
| pragma Assert (Is_Subprogram (Iface_Prim) |
| and then Is_Subprogram (Prim) |
| and then Is_Dispatching_Operation (Iface_Prim) |
| and then Is_Dispatching_Operation (Prim)); |
| |
| pragma Assert (Is_Interface (Iface) |
| or else (Present (Alias (Iface_Prim)) |
| and then |
| Is_Interface |
| (Find_Dispatching_Type (Ultimate_Alias (Iface_Prim))))); |
| |
| if Prim = Iface_Prim |
| or else not Is_Subprogram (Prim) |
| or else Ekind (Prim) /= Ekind (Iface_Prim) |
| or else not Is_Dispatching_Operation (Prim) |
| or else Scope (Prim) /= Scope (Tagged_Type) |
| or else No (Typ) |
| or else Base_Type (Typ) /= Base_Type (Tagged_Type) |
| or else not Primitive_Names_Match (Iface_Prim, Prim) |
| then |
| return False; |
| |
| -- The mode of the controlling formals must match |
| |
| elsif Present (Iface_Ctrl_F) |
| and then Present (Prim_Ctrl_F) |
| and then Ekind (Iface_Ctrl_F) /= Ekind (Prim_Ctrl_F) |
| then |
| return False; |
| |
| -- Case of a procedure, or a function whose result type matches the |
| -- result type of the interface primitive, or a function that has no |
| -- controlling result (I or access I). |
| |
| elsif Ekind (Iface_Prim) = E_Procedure |
| or else Etype (Prim) = Etype (Iface_Prim) |
| or else not Has_Controlling_Result (Prim) |
| then |
| return Type_Conformant |
| (Iface_Prim, Prim, Skip_Controlling_Formals => True); |
| |
| -- Case of a function returning an interface, or an access to one. Check |
| -- that the return types correspond. |
| |
| elsif Implements_Interface (Typ, Iface) then |
| if (Ekind (Etype (Prim)) = E_Anonymous_Access_Type) |
| /= |
| (Ekind (Etype (Iface_Prim)) = E_Anonymous_Access_Type) |
| then |
| return False; |
| else |
| return |
| Type_Conformant (Prim, Ultimate_Alias (Iface_Prim), |
| Skip_Controlling_Formals => True); |
| end if; |
| |
| else |
| return False; |
| end if; |
| end Is_Interface_Conformant; |
| |
| --------------------------------- |
| -- Is_Non_Overriding_Operation -- |
| --------------------------------- |
| |
| function Is_Non_Overriding_Operation |
| (Prev_E : Entity_Id; |
| New_E : Entity_Id) return Boolean |
| is |
| Formal : Entity_Id; |
| F_Typ : Entity_Id; |
| G_Typ : Entity_Id := Empty; |
| |
| function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id; |
| -- If F_Type is a derived type associated with a generic actual subtype, |
| -- then return its Generic_Parent_Type attribute, else return Empty. |
| |
| function Types_Correspond |
| (P_Type : Entity_Id; |
| N_Type : Entity_Id) return Boolean; |
| -- Returns true if and only if the types (or designated types in the |
| -- case of anonymous access types) are the same or N_Type is derived |
| -- directly or indirectly from P_Type. |
| |
| ----------------------------- |
| -- Get_Generic_Parent_Type -- |
| ----------------------------- |
| |
| function Get_Generic_Parent_Type (F_Typ : Entity_Id) return Entity_Id is |
| G_Typ : Entity_Id; |
| Defn : Node_Id; |
| Indic : Node_Id; |
| |
| begin |
| if Is_Derived_Type (F_Typ) |
| and then Nkind (Parent (F_Typ)) = N_Full_Type_Declaration |
| then |
| -- The tree must be traversed to determine the parent subtype in |
| -- the generic unit, which unfortunately isn't always available |
| -- via semantic attributes. ??? (Note: The use of Original_Node |
| -- is needed for cases where a full derived type has been |
| -- rewritten.) |
| |
| -- If the parent type is a scalar type, the derivation creates |
| -- an anonymous base type for it, and the source type is its |
| -- first subtype. |
| |
| if Is_Scalar_Type (F_Typ) |
| and then not Comes_From_Source (F_Typ) |
| then |
| Defn := |
| Type_Definition |
| (Original_Node (Parent (First_Subtype (F_Typ)))); |
| else |
| Defn := Type_Definition (Original_Node (Parent (F_Typ))); |
| end if; |
| if Nkind (Defn) = N_Derived_Type_Definition then |
| Indic := Subtype_Indication (Defn); |
| |
| if Nkind (Indic) = N_Subtype_Indication then |
| G_Typ := Entity (Subtype_Mark (Indic)); |
| else |
| G_Typ := Entity (Indic); |
| end if; |
| |
| if Nkind (Parent (G_Typ)) = N_Subtype_Declaration |
| and then Present (Generic_Parent_Type (Parent (G_Typ))) |
| then |
| return Generic_Parent_Type (Parent (G_Typ)); |
| end if; |
| end if; |
| end if; |
| |
| return Empty; |
| end Get_Generic_Parent_Type; |
| |
| ---------------------- |
| -- Types_Correspond -- |
| ---------------------- |
| |
| function Types_Correspond |
| (P_Type : Entity_Id; |
| N_Type : Entity_Id) return Boolean |
| is |
| Prev_Type : Entity_Id := Base_Type (P_Type); |
| New_Type : Entity_Id := Base_Type (N_Type); |
| |
| begin |
| if Ekind (Prev_Type) = E_Anonymous_Access_Type then |
| Prev_Type := Designated_Type (Prev_Type); |
| end if; |
| |
| if Ekind (New_Type) = E_Anonymous_Access_Type then |
| New_Type := Designated_Type (New_Type); |
| end if; |
| |
| if Prev_Type = New_Type then |
| return True; |
| |
| elsif not Is_Class_Wide_Type (New_Type) then |
| while Etype (New_Type) /= New_Type loop |
| New_Type := Etype (New_Type); |
| |
| if New_Type = Prev_Type then |
| return True; |
| end if; |
| end loop; |
| end if; |
| return False; |
| end Types_Correspond; |
| |
| -- Start of processing for Is_Non_Overriding_Operation |
| |
| begin |
| -- In the case where both operations are implicit derived subprograms |
| -- then neither overrides the other. This can only occur in certain |
| -- obscure cases (e.g., derivation from homographs created in a generic |
| -- instantiation). |
| |
| if Present (Alias (Prev_E)) and then Present (Alias (New_E)) then |
| return True; |
| |
| elsif Ekind (Current_Scope) = E_Package |
| and then Is_Generic_Instance (Current_Scope) |
| and then In_Private_Part (Current_Scope) |
| and then Comes_From_Source (New_E) |
| then |
| -- We examine the formals and result type of the inherited operation, |
| -- to determine whether their type is derived from (the instance of) |
| -- a generic type. The first such formal or result type is the one |
| -- tested. |
| |
| Formal := First_Formal (Prev_E); |
| F_Typ := Empty; |
| while Present (Formal) loop |
| F_Typ := Base_Type (Etype (Formal)); |
| |
| if Ekind (F_Typ) = E_Anonymous_Access_Type then |
| F_Typ := Designated_Type (F_Typ); |
| end if; |
| |
| G_Typ := Get_Generic_Parent_Type (F_Typ); |
| exit when Present (G_Typ); |
| |
| Next_Formal (Formal); |
| end loop; |
| |
| -- If the function dispatches on result check the result type |
| |
| if No (G_Typ) and then Ekind (Prev_E) = E_Function then |
| G_Typ := Get_Generic_Parent_Type (Base_Type (Etype (Prev_E))); |
| end if; |
| |
| if No (G_Typ) then |
| return False; |
| end if; |
| |
| -- If the generic type is a private type, then the original operation |
| -- was not overriding in the generic, because there was no primitive |
| -- operation to override. |
| |
| if Nkind (Parent (G_Typ)) = N_Formal_Type_Declaration |
| and then Nkind (Formal_Type_Definition (Parent (G_Typ))) = |
| N_Formal_Private_Type_Definition |
| then |
| return True; |
| |
| -- The generic parent type is the ancestor of a formal derived |
| -- type declaration. We need to check whether it has a primitive |
| -- operation that should be overridden by New_E in the generic. |
| |
| else |
| declare |
| P_Formal : Entity_Id; |
| N_Formal : Entity_Id; |
| P_Typ : Entity_Id; |
| N_Typ : Entity_Id; |
| P_Prim : Entity_Id; |
| Prim_Elt : Elmt_Id := First_Elmt (Primitive_Operations (G_Typ)); |
| |
| begin |
| while Present (Prim_Elt) loop |
| P_Prim := Node (Prim_Elt); |
| |
| if Chars (P_Prim) = Chars (New_E) |
| and then Ekind (P_Prim) = Ekind (New_E) |
| then |
| P_Formal := First_Formal (P_Prim); |
| N_Formal := First_Formal (New_E); |
| while Present (P_Formal) and then Present (N_Formal) loop |
| P_Typ := Etype (P_Formal); |
| N_Typ := Etype (N_Formal); |
| |
| if not Types_Correspond (P_Typ, N_Typ) then |
| exit; |
| end if; |
| |
| Next_Entity (P_Formal); |
| Next_Entity (N_Formal); |
| end loop; |
| |
| -- Found a matching primitive operation belonging to the |
| -- formal ancestor type, so the new subprogram is |
| -- overriding. |
| |
| if No (P_Formal) |
| and then No (N_Formal) |
| and then (Ekind (New_E) /= E_Function |
| or else |
| Types_Correspond |
| (Etype (P_Prim), Etype (New_E))) |
| then |
| return False; |
| end if; |
| end if; |
| |
| Next_Elmt (Prim_Elt); |
| end loop; |
| |
| -- If no match found, then the new subprogram does not override |
| -- in the generic (nor in the instance). |
| |
| -- If the type in question is not abstract, and the subprogram |
| -- is, this will be an error if the new operation is in the |
| -- private part of the instance. Emit a warning now, which will |
| -- make the subsequent error message easier to understand. |
| |
| if Present (F_Typ) and then not Is_Abstract_Type (F_Typ) |
| and then Is_Abstract_Subprogram (Prev_E) |
| and then In_Private_Part (Current_Scope) |
| then |
| Error_Msg_Node_2 := F_Typ; |
| Error_Msg_NE |
| ("private operation& in generic unit does not override " |
| & "any primitive operation of& (RM 12.3 (18))??", |
| New_E, New_E); |
| end if; |
| |
| return True; |
| end; |
| end if; |
| else |
| return False; |
| end if; |
| end Is_Non_Overriding_Operation; |
| |
| ------------------------------------- |
| -- List_Inherited_Pre_Post_Aspects -- |
| ------------------------------------- |
| |
| procedure List_Inherited_Pre_Post_Aspects (E : Entity_Id) is |
| begin |
| if Opt.List_Inherited_Aspects |
| and then Is_Subprogram_Or_Generic_Subprogram (E) |
| then |
| declare |
| Subps : constant Subprogram_List := Inherited_Subprograms (E); |
| Items : Node_Id; |
| Prag : Node_Id; |
| |
| begin |
| for Index in Subps'Range loop |
| Items := Contract (Subps (Index)); |
| |
| if Present (Items) then |
| Prag := Pre_Post_Conditions (Items); |
| while Present (Prag) loop |
| Error_Msg_Sloc := Sloc (Prag); |
| |
| if Class_Present (Prag) |
| and then not Split_PPC (Prag) |
| then |
| if Pragma_Name (Prag) = Name_Precondition then |
| Error_Msg_N |
| ("info: & inherits `Pre''Class` aspect from " |
| & "#?L?", E); |
| else |
| Error_Msg_N |
| ("info: & inherits `Post''Class` aspect from " |
| & "#?L?", E); |
| end if; |
| end if; |
| |
| Prag := Next_Pragma (Prag); |
| end loop; |
| end if; |
| end loop; |
| end; |
| end if; |
| end List_Inherited_Pre_Post_Aspects; |
| |
| ------------------------------ |
| -- Make_Inequality_Operator -- |
| ------------------------------ |
| |
| -- S is the defining identifier of an equality operator. We build a |
| -- subprogram declaration with the right signature. This operation is |
| -- intrinsic, because it is always expanded as the negation of the |
| -- call to the equality function. |
| |
| procedure Make_Inequality_Operator (S : Entity_Id) is |
| Loc : constant Source_Ptr := Sloc (S); |
| Decl : Node_Id; |
| Formals : List_Id; |
| Op_Name : Entity_Id; |
| |
| FF : constant Entity_Id := First_Formal (S); |
| NF : constant Entity_Id := Next_Formal (FF); |
| |
| begin |
| -- Check that equality was properly defined, ignore call if not |
| |
| if No (NF) then |
| return; |
| end if; |
| |
| declare |
| A : constant Entity_Id := |
| Make_Defining_Identifier (Sloc (FF), |
| Chars => Chars (FF)); |
| |
| B : constant Entity_Id := |
| Make_Defining_Identifier (Sloc (NF), |
| Chars => Chars (NF)); |
| |
| begin |
| Op_Name := Make_Defining_Operator_Symbol (Loc, Name_Op_Ne); |
| |
| Formals := New_List ( |
| Make_Parameter_Specification (Loc, |
| Defining_Identifier => A, |
| Parameter_Type => |
| New_Occurrence_Of (Etype (First_Formal (S)), |
| Sloc (Etype (First_Formal (S))))), |
| |
| Make_Parameter_Specification (Loc, |
| Defining_Identifier => B, |
| Parameter_Type => |
| New_Occurrence_Of (Etype (Next_Formal (First_Formal (S))), |
| Sloc (Etype (Next_Formal (First_Formal (S))))))); |
| |
| Decl := |
| Make_Subprogram_Declaration (Loc, |
| Specification => |
| Make_Function_Specification (Loc, |
| Defining_Unit_Name => Op_Name, |
| Parameter_Specifications => Formals, |
| Result_Definition => |
| New_Occurrence_Of (Standard_Boolean, Loc))); |
| |
| -- Insert inequality right after equality if it is explicit or after |
| -- the derived type when implicit. These entities are created only |
| -- for visibility purposes, and eventually replaced in the course |
| -- of expansion, so they do not need to be attached to the tree and |
| -- seen by the back-end. Keeping them internal also avoids spurious |
| -- freezing problems. The declaration is inserted in the tree for |
| -- analysis, and removed afterwards. If the equality operator comes |
| -- from an explicit declaration, attach the inequality immediately |
| -- after. Else the equality is inherited from a derived type |
| -- declaration, so insert inequality after that declaration. |
| |
| if No (Alias (S)) then |
| Insert_After (Unit_Declaration_Node (S), Decl); |
| elsif Is_List_Member (Parent (S)) then |
| Insert_After (Parent (S), Decl); |
| else |
| Insert_After (Parent (Etype (First_Formal (S))), Decl); |
| end if; |
| |
| Mark_Rewrite_Insertion (Decl); |
| Set_Is_Intrinsic_Subprogram (Op_Name); |
| Analyze (Decl); |
| Remove (Decl); |
| Set_Has_Completion (Op_Name); |
| Set_Corresponding_Equality (Op_Name, S); |
| Set_Is_Abstract_Subprogram (Op_Name, Is_Abstract_Subprogram (S)); |
| end; |
| end Make_Inequality_Operator; |
| |
| ---------------------- |
| -- May_Need_Actuals -- |
| ---------------------- |
| |
| procedure May_Need_Actuals (Fun : Entity_Id) is |
| F : Entity_Id; |
| B : Boolean; |
| |
| begin |
| F := First_Formal (Fun); |
| B := True; |
| while Present (F) loop |
| if No (Default_Value (F)) then |
| B := False; |
| exit; |
| end if; |
| |
| Next_Formal (F); |
| end loop; |
| |
| Set_Needs_No_Actuals (Fun, B); |
| end May_Need_Actuals; |
| |
| --------------------- |
| -- Mode_Conformant -- |
| --------------------- |
| |
| function Mode_Conformant (New_Id, Old_Id : Entity_Id) return Boolean is |
| Result : Boolean; |
| begin |
| Check_Conformance (New_Id, Old_Id, Mode_Conformant, False, Result); |
| return Result; |
| end Mode_Conformant; |
| |
| --------------------------- |
| -- New_Overloaded_Entity -- |
| --------------------------- |
| |
| procedure New_Overloaded_Entity |
| (S : Entity_Id; |
| Derived_Type : Entity_Id := Empty) |
| is |
| Overridden_Subp : Entity_Id := Empty; |
| -- Set if the current scope has an operation that is type-conformant |
| -- with S, and becomes hidden by S. |
| |
| Is_Primitive_Subp : Boolean; |
| -- Set to True if the new subprogram is primitive |
| |
| E : Entity_Id; |
| -- Entity that S overrides |
| |
| procedure Check_For_Primitive_Subprogram |
| (Is_Primitive : out Boolean; |
| Is_Overriding : Boolean := False); |
| -- If the subprogram being analyzed is a primitive operation of the type |
| -- of a formal or result, set the Has_Primitive_Operations flag on the |
| -- type, and set Is_Primitive to True (otherwise set to False). Set the |
| -- corresponding flag on the entity itself for later use. |
| |
| function Has_Matching_Entry_Or_Subprogram (E : Entity_Id) return Boolean; |
| -- True if a) E is a subprogram whose first formal is a concurrent type |
| -- defined in the scope of E that has some entry or subprogram whose |
| -- profile matches E, or b) E is an internally built dispatching |
| -- subprogram of a protected type and there is a matching subprogram |
| -- defined in the enclosing scope of the protected type, or c) E is |
| -- an entry of a synchronized type and a matching procedure has been |
| -- previously defined in the enclosing scope of the synchronized type. |
| |
| function Is_Private_Declaration (E : Entity_Id) return Boolean; |
| -- Check that E is declared in the private part of the current package, |
| -- or in the package body, where it may hide a previous declaration. |
| -- We can't use In_Private_Part by itself because this flag is also |
| -- set when freezing entities, so we must examine the place of the |
| -- declaration in the tree, and recognize wrapper packages as well. |
| |
| function Is_Overriding_Alias |
| (Old_E : Entity_Id; |
| New_E : Entity_Id) return Boolean; |
| -- Check whether new subprogram and old subprogram are both inherited |
| -- from subprograms that have distinct dispatch table entries. This can |
| -- occur with derivations from instances with accidental homonyms. The |
| -- function is conservative given that the converse is only true within |
| -- instances that contain accidental overloadings. |
| |
| procedure Report_Conflict (S : Entity_Id; E : Entity_Id); |
| -- Report conflict between entities S and E |
| |
| ------------------------------------ |
| -- Check_For_Primitive_Subprogram -- |
| ------------------------------------ |
| |
| procedure Check_For_Primitive_Subprogram |
| (Is_Primitive : out Boolean; |
| Is_Overriding : Boolean := False) |
| is |
| Formal : Entity_Id; |
| F_Typ : Entity_Id; |
| B_Typ : Entity_Id; |
| |
| function Visible_Part_Type (T : Entity_Id) return Boolean; |
| -- Returns true if T is declared in the visible part of the current |
| -- package scope; otherwise returns false. Assumes that T is declared |
| -- in a package. |
| |
| procedure Check_Private_Overriding (T : Entity_Id); |
| -- Checks that if a primitive abstract subprogram of a visible |
| -- abstract type is declared in a private part, then it must override |
| -- an abstract subprogram declared in the visible part. Also checks |
| -- that if a primitive function with a controlling result is declared |
| -- in a private part, then it must override a function declared in |
| -- the visible part. |
| |
| ------------------------------ |
| -- Check_Private_Overriding -- |
| ------------------------------ |
| |
| procedure Check_Private_Overriding (T : Entity_Id) is |
| function Overrides_Private_Part_Op return Boolean; |
| -- This detects the special case where the overriding subprogram |
| -- is overriding a subprogram that was declared in the same |
| -- private part. That case is illegal by 3.9.3(10). |
| |
| function Overrides_Visible_Function |
| (Partial_View : Entity_Id) return Boolean; |
| -- True if S overrides a function in the visible part. The |
| -- overridden function could be explicitly or implicitly declared. |
| |
| ------------------------------- |
| -- Overrides_Private_Part_Op -- |
| ------------------------------- |
| |
| function Overrides_Private_Part_Op return Boolean is |
| Over_Decl : constant Node_Id := |
| Unit_Declaration_Node (Overridden_Operation (S)); |
| Subp_Decl : constant Node_Id := Unit_Declaration_Node (S); |
| |
| begin |
| pragma Assert (Is_Overriding); |
| pragma Assert |
| (Nkind (Over_Decl) = N_Abstract_Subprogram_Declaration); |
| pragma Assert |
| (Nkind (Subp_Decl) = N_Abstract_Subprogram_Declaration); |
| |
| return In_Same_List (Over_Decl, Subp_Decl); |
| end Overrides_Private_Part_Op; |
| |
| -------------------------------- |
| -- Overrides_Visible_Function -- |
| -------------------------------- |
| |
| function Overrides_Visible_Function |
| (Partial_View : Entity_Id) return Boolean |
| is |
| begin |
| if not Is_Overriding or else not Has_Homonym (S) then |
| return False; |
| end if; |
| |
| if not Present (Partial_View) then |
| return True; |
| end if; |
| |
| -- Search through all the homonyms H of S in the current |
| -- package spec, and return True if we find one that matches. |
| -- Note that Parent (H) will be the declaration of the |
| -- partial view of T for a match. |
| |
| declare |
| H : Entity_Id := S; |
| begin |
| loop |
| H := Homonym (H); |
| exit when not Present (H) or else Scope (H) /= Scope (S); |
| |
| if Nkind_In |
| (Parent (H), |
| N_Private_Extension_Declaration, |
| N_Private_Type_Declaration) |
| and then Defining_Identifier (Parent (H)) = Partial_View |
| then |
| return True; |
| end if; |
| end loop; |
| end; |
| |
| return False; |
| end Overrides_Visible_Function; |
| |
| -- Start of processing for Check_Private_Overriding |
| |
| begin |
| if Is_Package_Or_Generic_Package (Current_Scope) |
| and then In_Private_Part (Current_Scope) |
| and then Visible_Part_Type (T) |
| and then not In_Instance |
| then |
| if Is_Abstract_Type (T) |
| and then Is_Abstract_Subprogram (S) |
| and then (not Is_Overriding |
| or else not Is_Abstract_Subprogram (E) |
| or else Overrides_Private_Part_Op) |
| then |
| Error_Msg_N |
| ("abstract subprograms must be visible (RM 3.9.3(10))!", |
| S); |
| |
| elsif Ekind (S) = E_Function then |
| declare |
| Partial_View : constant Entity_Id := |
| Incomplete_Or_Partial_View (T); |
| |
| begin |
| if not Overrides_Visible_Function (Partial_View) then |
| |
| -- Here, S is "function ... return T;" declared in |
| -- the private part, not overriding some visible |
| -- operation. That's illegal in the tagged case |
| -- (but not if the private type is untagged). |
| |
| if ((Present (Partial_View) |
| and then Is_Tagged_Type (Partial_View)) |
| or else (not Present (Partial_View) |
| and then Is_Tagged_Type (T))) |
| and then T = Base_Type (Etype (S)) |
| then |
| Error_Msg_N |
| ("private function with tagged result must" |
| & " override visible-part function", S); |
| Error_Msg_N |
| ("\move subprogram to the visible part" |
| & " (RM 3.9.3(10))", S); |
| |
| -- AI05-0073: extend this test to the case of a |
| -- function with a controlling access result. |
| |
| elsif Ekind (Etype (S)) = E_Anonymous_Access_Type |
| and then Is_Tagged_Type (Designated_Type (Etype (S))) |
| and then |
| not Is_Class_Wide_Type |
| (Designated_Type (Etype (S))) |
| and then Ada_Version >= Ada_2012 |
| then |
| Error_Msg_N |
| ("private function with controlling access " |
| & "result must override visible-part function", |
| S); |
| Error_Msg_N |
| ("\move subprogram to the visible part" |
| & " (RM 3.9.3(10))", S); |
| end if; |
| end if; |
| end; |
| end if; |
| end if; |
| end Check_Private_Overriding; |
| |
| ----------------------- |
| -- Visible_Part_Type -- |
| ----------------------- |
| |
| function Visible_Part_Type (T : Entity_Id) return Boolean is |
| P : constant Node_Id := Unit_Declaration_Node (Scope (T)); |
| |
| begin |
| -- If the entity is a private type, then it must be declared in a |
| -- visible part. |
| |
| if Ekind (T) in Private_Kind then |
| return True; |
| |
| elsif Is_Type (T) and then Has_Private_Declaration (T) then |
| return True; |
| |
| elsif Is_List_Member (Declaration_Node (T)) |
| and then List_Containing (Declaration_Node (T)) = |
| Visible_Declarations (Specification (P)) |
| then |
| return True; |
| |
| else |
| return False; |
| end if; |
| end Visible_Part_Type; |
| |
| -- Start of processing for Check_For_Primitive_Subprogram |
| |
| begin |
| Is_Primitive := False; |
| |
| if not Comes_From_Source (S) then |
| null; |
| |
| -- If subprogram is at library level, it is not primitive operation |
| |
| elsif Current_Scope = Standard_Standard then |
| null; |
| |
| elsif (Is_Package_Or_Generic_Package (Current_Scope) |
| and then not In_Package_Body (Current_Scope)) |
| or else Is_Overriding |
| then |
| -- For function, check return type |
| |
| if Ekind (S) = E_Function then |
| if Ekind (Etype (S)) = E_Anonymous_Access_Type then |
| F_Typ := Designated_Type (Etype (S)); |
| else |
| F_Typ := Etype (S); |
| end if; |
| |
| B_Typ := Base_Type (F_Typ); |
| |
| if Scope (B_Typ) = Current_Scope |
| and then not Is_Class_Wide_Type (B_Typ) |
| and then not Is_Generic_Type (B_Typ) |
| then |
| Is_Primitive := True; |
| Set_Has_Primitive_Operations (B_Typ); |
| Set_Is_Primitive (S); |
| Check_Private_Overriding (B_Typ); |
| |
| -- The Ghost policy in effect at the point of declaration |
| -- or a tagged type and a primitive operation must match |
| -- (SPARK RM 6.9(16)). |
| |
| Check_Ghost_Primitive (S, B_Typ); |
| end if; |
| end if; |
| |
| -- For all subprograms, check formals |
| |
| Formal := First_Formal (S); |
| while Present (Formal) loop |
| if Ekind (Etype (Formal)) = E_Anonymous_Access_Type then |
| F_Typ := Designated_Type (Etype (Formal)); |
| else |
| F_Typ := Etype (Formal); |
| end if; |
| |
| B_Typ := Base_Type (F_Typ); |
| |
| if Ekind (B_Typ) = E_Access_Subtype then |
| B_Typ := Base_Type (B_Typ); |
| end if; |
| |
| if Scope (B_Typ) = Current_Scope |
| and then not Is_Class_Wide_Type (B_Typ) |
| and then not Is_Generic_Type (B_Typ) |
| then |
| Is_Primitive := True; |
| Set_Is_Primitive (S); |
| Set_Has_Primitive_Operations (B_Typ); |
| Check_Private_Overriding (B_Typ); |
| |
| -- The Ghost policy in effect at the point of declaration |
| -- of a tagged type and a primitive operation must match |
| -- (SPARK RM 6.9(16)). |
| |
| Check_Ghost_Primitive (S, B_Typ); |
| end if; |
| |
| Next_Formal (Formal); |
| end loop; |
| |
| -- Special case: An equality function can be redefined for a type |
| -- occurring in a declarative part, and won't otherwise be treated as |
| -- a primitive because it doesn't occur in a package spec and doesn't |
| -- override an inherited subprogram. It's important that we mark it |
| -- primitive so it can be returned by Collect_Primitive_Operations |
| -- and be used in composing the equality operation of later types |
| -- that have a component of the type. |
| |
| elsif Chars (S) = Name_Op_Eq |
| and then Etype (S) = Standard_Boolean |
| then |
| B_Typ := Base_Type (Etype (First_Formal (S))); |
| |
| if Scope (B_Typ) = Current_Scope |
| and then |
| Base_Type (Etype (Next_Formal (First_Formal (S)))) = B_Typ |
| and then not Is_Limited_Type (B_Typ) |
| then |
| Is_Primitive := True; |
| Set_Is_Primitive (S); |
| Set_Has_Primitive_Operations (B_Typ); |
| Check_Private_Overriding (B_Typ); |
| |
| -- The Ghost policy in effect at the point of declaration of a |
| -- tagged type and a primitive operation must match |
| -- (SPARK RM 6.9(16)). |
| |
| Check_Ghost_Primitive (S, B_Typ); |
| end if; |
| end if; |
| end Check_For_Primitive_Subprogram; |
| |
| -------------------------------------- |
| -- Has_Matching_Entry_Or_Subprogram -- |
| -------------------------------------- |
| |
| function Has_Matching_Entry_Or_Subprogram |
| (E : Entity_Id) return Boolean |
| is |
| function Check_Conforming_Parameters |
| (E1_Param : Node_Id; |
| E2_Param : Node_Id; |
| Ctype : Conformance_Type) return Boolean; |
| -- Starting from the given parameters, check that all the parameters |
| -- of two entries or subprograms are conformant. Used to skip |
| -- the check on the controlling argument. |
| |
| function Matching_Entry_Or_Subprogram |
| (Conc_Typ : Entity_Id; |
| Subp : Entity_Id) return Entity_Id; |
| -- Return the first entry or subprogram of the given concurrent type |
| -- whose name matches the name of Subp and has a profile conformant |
| -- with Subp; return Empty if not found. |
| |
| function Matching_Dispatching_Subprogram |
| (Conc_Typ : Entity_Id; |
| Ent : Entity_Id) return Entity_Id; |
| -- Return the first dispatching primitive of Conc_Type defined in the |
| -- enclosing scope of Conc_Type (i.e. before the full definition of |
| -- this concurrent type) whose name matches the entry Ent and has a |
| -- profile conformant with the profile of the corresponding (not yet |
| -- built) dispatching primitive of Ent; return Empty if not found. |
| |
| function Matching_Original_Protected_Subprogram |
| (Prot_Typ : Entity_Id; |
| Subp : Entity_Id) return Entity_Id; |
| -- Return the first subprogram defined in the enclosing scope of |
| -- Prot_Typ (before the full definition of this protected type) |
| -- whose name matches the original name of Subp and has a profile |
| -- conformant with the profile of Subp; return Empty if not found. |
| |
| function Normalized_First_Parameter_Type |
| (E : Entity_Id) return Entity_Id; |
| -- Return the type of the first parameter unless that type |
| -- is an anonymous access type, in which case return the |
| -- designated type. Used to treat anonymous-access-to-synchronized |
| -- the same as synchronized for purposes of checking for |
| -- prefixed view profile conflicts. |
| |
| --------------------------------- |
| -- Check_Conforming_Parameters -- |
| --------------------------------- |
| |
| function Check_Conforming_Parameters |
| (E1_Param : Node_Id; |
| E2_Param : Node_Id; |
| Ctype : Conformance_Type) return Boolean |
| is |
| Param_E1 : Node_Id := E1_Param; |
| Param_E2 : Node_Id := E2_Param; |
| |
| begin |
| while Present (Param_E1) and then Present (Param_E2) loop |
| if (Ctype >= Mode_Conformant) and then |
| Ekind (Defining_Identifier (Param_E1)) /= |
| Ekind (Defining_Identifier (Param_E2)) |
| then |
| return False; |
| elsif not |
| Conforming_Types |
| (Find_Parameter_Type (Param_E1), |
| Find_Parameter_Type (Param_E2), |
| Ctype) |
| then |
| return False; |
| end if; |
| |
| Next (Param_E1); |
| Next (Param_E2); |
| end loop; |
| |
| -- The candidate is not valid if one of the two lists contains |
| -- more parameters than the other |
| |
| return No (Param_E1) and then No (Param_E2); |
| end Check_Conforming_Parameters; |
| |
| ---------------------------------- |
| -- Matching_Entry_Or_Subprogram -- |
| ---------------------------------- |
| |
| function Matching_Entry_Or_Subprogram |
| (Conc_Typ : Entity_Id; |
| Subp : Entity_Id) return Entity_Id |
| is |
| E : Entity_Id; |
| |
| begin |
| E := First_Entity (Conc_Typ); |
| while Present (E) loop |
| if Chars (Subp) = Chars (E) |
| and then (Ekind (E) = E_Entry or else Is_Subprogram (E)) |
| and then |
| Check_Conforming_Parameters |
| (First (Parameter_Specifications (Parent (E))), |
| Next (First (Parameter_Specifications (Parent (Subp)))), |
| Type_Conformant) |
| then |
| return E; |
| end if; |
| |
| Next_Entity (E); |
| end loop; |
| |
| return Empty; |
| end Matching_Entry_Or_Subprogram; |
| |
| ------------------------------------- |
| -- Matching_Dispatching_Subprogram -- |
| ------------------------------------- |
| |
| function Matching_Dispatching_Subprogram |
| (Conc_Typ : Entity_Id; |
| Ent : Entity_Id) return Entity_Id |
| is |
| E : Entity_Id; |
| |
| begin |
| -- Search for entities in the enclosing scope of this synchonized |
| -- type. |
| |
| pragma Assert (Is_Concurrent_Type (Conc_Typ)); |
| Push_Scope (Scope (Conc_Typ)); |
| E := Current_Entity_In_Scope (Ent); |
| Pop_Scope; |
| |
| while Present (E) loop |
| if Scope (E) = Scope (Conc_Typ) |
| and then Comes_From_Source (E) |
| and then Ekind (E) = E_Procedure |
| and then Present (First_Entity (E)) |
| and then Is_Controlling_Formal (First_Entity (E)) |
| and then Etype (First_Entity (E)) = Conc_Typ |
| and then |
| Check_Conforming_Parameters |
| (First (Parameter_Specifications (Parent (Ent))), |
| Next (First (Parameter_Specifications (Parent (E)))), |
| Subtype_Conformant) |
| then |
| return E; |
| end if; |
| |
| E := Homonym (E); |
| end loop; |
| |
| return Empty; |
| end Matching_Dispatching_Subprogram; |
| |
| -------------------------------------------- |
| -- Matching_Original_Protected_Subprogram -- |
| -------------------------------------------- |
| |
| function Matching_Original_Protected_Subprogram |
| (Prot_Typ : Entity_Id; |
| Subp : Entity_Id) return Entity_Id |
| is |
| ICF : constant Boolean := |
| Is_Controlling_Formal (First_Entity (Subp)); |
| E : Entity_Id; |
| |
| begin |
| -- Temporarily decorate the first parameter of Subp as controlling |
| -- formal, required to invoke Subtype_Conformant. |
| |
| Set_Is_Controlling_Formal (First_Entity (Subp)); |
| |
| E := |
| Current_Entity_In_Scope (Original_Protected_Subprogram (Subp)); |
| |
| while Present (E) loop |
| if Scope (E) = Scope (Prot_Typ) |
| and then Comes_From_Source (E) |
| and then Ekind (Subp) = Ekind (E) |
| and then Present (First_Entity (E)) |
| and then Is_Controlling_Formal (First_Entity (E)) |
| and then Etype (First_Entity (E)) = Prot_Typ |
| and then Subtype_Conformant (Subp, E, |
| Skip_Controlling_Formals => True) |
| then |
| Set_Is_Controlling_Formal (First_Entity (Subp), ICF); |
| return E; |
| end if; |
| |
| E := Homonym (E); |
| end loop; |
| |
| Set_Is_Controlling_Formal (First_Entity (Subp), ICF); |
| |
| return Empty; |
| end Matching_Original_Protected_Subprogram; |
| |
| ------------------------------------- |
| -- Normalized_First_Parameter_Type -- |
| ------------------------------------- |
| |
| function Normalized_First_Parameter_Type |
| (E : Entity_Id) return Entity_Id |
| is |
| Result : Entity_Id := Etype (First_Entity (E)); |
| begin |
| if Ekind (Result) = E_Anonymous_Access_Type then |
| Result := Designated_Type (Result); |
| end if; |
| return Result; |
| end Normalized_First_Parameter_Type; |
| |
| -- Start of processing for Has_Matching_Entry_Or_Subprogram |
| |
| begin |
| -- Case 1: E is a subprogram whose first formal is a concurrent type |
| -- defined in the scope of E that has an entry or subprogram whose |
| -- profile matches E. |
| |
| if Comes_From_Source (E) |
| and then Is_Subprogram (E) |
| and then Present (First_Entity (E)) |
| and then Is_Concurrent_Record_Type |
| (Normalized_First_Parameter_Type (E)) |
| then |
| if Scope (E) = |
| Scope (Corresponding_Concurrent_Type |
| (Normalized_First_Parameter_Type (E))) |
| and then |
| Present |
| (Matching_Entry_Or_Subprogram |
| (Corresponding_Concurrent_Type |
| (Normalized_First_Parameter_Type (E)), |
| Subp => E)) |
| then |
| Report_Conflict (E, |
| Matching_Entry_Or_Subprogram |
| (Corresponding_Concurrent_Type |
| (Normalized_First_Parameter_Type (E)), |
| Subp => E)); |
| return True; |
| end if; |
| |
| -- Case 2: E is an internally built dispatching subprogram of a |
| -- protected type and there is a subprogram defined in the enclosing |
| -- scope of the protected type that has the original name of E and |
| -- its profile is conformant with the profile of E. We check the |
| -- name of the original protected subprogram associated with E since |
| -- the expander builds dispatching primitives of protected functions |
| -- and procedures with other names (see Exp_Ch9.Build_Selected_Name). |
| |
| elsif not Comes_From_Source (E) |
| and then Is_Subprogram (E) |
| and then Present (First_Entity (E)) |
| and then Is_Concurrent_Record_Type (Etype (First_Entity (E))) |
| and then Present (Original_Protected_Subprogram (E)) |
| and then |
| Present |
| (Matching_Original_Protected_Subprogram |
| (Corresponding_Concurrent_Type (Etype (First_Entity (E))), |
| Subp => E)) |
| then |
| Report_Conflict (E, |
| Matching_Original_Protected_Subprogram |
| (Corresponding_Concurrent_Type (Etype (First_Entity (E))), |
| Subp => E)); |
| return True; |
| |
| -- Case 3: E is an entry of a synchronized type and a matching |
| -- procedure has been previously defined in the enclosing scope |
| -- of the synchronized type. |
| |
| elsif Comes_From_Source (E) |
| and then Ekind (E) = E_Entry |
| and then |
| Present (Matching_Dispatching_Subprogram (Current_Scope, E)) |
| then |
| Report_Conflict (E, |
| Matching_Dispatching_Subprogram (Current_Scope, E)); |
| return True; |
| end if; |
| |
| return False; |
| end Has_Matching_Entry_Or_Subprogram; |
| |
| ---------------------------- |
| -- Is_Private_Declaration -- |
| ---------------------------- |
| |
| function Is_Private_Declaration (E : Entity_Id) return Boolean is |
| Decl : constant Node_Id := Unit_Declaration_Node (E); |
| Priv_Decls : List_Id; |
| |
| begin |
| if Is_Package_Or_Generic_Package (Current_Scope) |
| and then In_Private_Part (Current_Scope) |
| then |
| Priv_Decls := |
| Private_Declarations (Package_Specification (Current_Scope)); |
| |
| return In_Package_Body (Current_Scope) |
| or else |
| (Is_List_Member (Decl) |
| and then List_Containing (Decl) = Priv_Decls) |
| or else (Nkind (Parent (Decl)) = N_Package_Specification |
| and then not |
| Is_Compilation_Unit |
| (Defining_Entity (Parent (Decl))) |
| and then List_Containing (Parent (Parent (Decl))) = |
| Priv_Decls); |
| else |
| return False; |
| end if; |
| end Is_Private_Declaration; |
| |
| -------------------------- |
| -- Is_Overriding_Alias -- |
| -------------------------- |
| |
| function Is_Overriding_Alias |
| (Old_E : Entity_Id; |
| New_E : Entity_Id) return Boolean |
| is |
| AO : constant Entity_Id := Alias (Old_E); |
| AN : constant Entity_Id := Alias (New_E); |
| |
| begin |
| return Scope (AO) /= Scope (AN) |
| or else No (DTC_Entity (AO)) |
| or else No (DTC_Entity (AN)) |
| or else DT_Position (AO) = DT_Position (AN); |
| end Is_Overriding_Alias; |
| |
| --------------------- |
| -- Report_Conflict -- |
| --------------------- |
| |
| procedure Report_Conflict (S : Entity_Id; E : Entity_Id) is |
| begin |
| Error_Msg_Sloc := Sloc (E); |
| |
| -- Generate message, with useful additional warning if in generic |
| |
| if Is_Generic_Unit (E) then |
| Error_Msg_N ("previous generic unit cannot be overloaded", S); |
| Error_Msg_N ("\& conflicts with declaration#", S); |
| else |
| Error_Msg_N ("& conflicts with declaration#", S); |
| end if; |
| end Report_Conflict; |
| |
| -- Start of processing for New_Overloaded_Entity |
| |
| begin |
| -- We need to look for an entity that S may override. This must be a |
| -- homonym in the current scope, so we look for the first homonym of |
| -- S in the current scope as the starting point for the search. |
| |
| E := Current_Entity_In_Scope (S); |
| |
| -- Ada 2005 (AI-251): Derivation of abstract interface primitives. |
| -- They are directly added to the list of primitive operations of |
| -- Derived_Type, unless this is a rederivation in the private part |
| -- of an operation that was already derived in the visible part of |
| -- the current package. |
| |
| if Ada_Version >= Ada_2005 |
| and then Present (Derived_Type) |
| and then Present (Alias (S)) |
| and then Is_Dispatching_Operation (Alias (S)) |
| and then Present (Find_Dispatching_Type (Alias (S))) |
| and then Is_Interface (Find_Dispatching_Type (Alias (S))) |
| then |
| -- For private types, when the full-view is processed we propagate to |
| -- the full view the non-overridden entities whose attribute "alias" |
| -- references an interface primitive. These entities were added by |
| -- Derive_Subprograms to ensure that interface primitives are |
| -- covered. |
| |
| -- Inside_Freeze_Actions is non zero when S corresponds with an |
| -- internal entity that links an interface primitive with its |
| -- covering primitive through attribute Interface_Alias (see |
| -- Add_Internal_Interface_Entities). |
| |
| if Inside_Freezing_Actions = 0 |
| and then Is_Package_Or_Generic_Package (Current_Scope) |
| and then In_Private_Part (Current_Scope) |
| and then Nkind (Parent (E)) = N_Private_Extension_Declaration |
| and then Nkind (Parent (S)) = N_Full_Type_Declaration |
| and then Full_View (Defining_Identifier (Parent (E))) |
| = Defining_Identifier (Parent (S)) |
| and then Alias (E) = Alias (S) |
| then |
| Check_Operation_From_Private_View (S, E); |
| Set_Is_Dispatching_Operation (S); |
| |
| -- Common case |
| |
| else |
| Enter_Overloaded_Entity (S); |
| Check_Dispatching_Operation (S, Empty); |
| Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
| end if; |
| |
| return; |
| end if; |
| |
| -- For synchronized types check conflicts of this entity with previously |
| -- defined entities. |
| |
| if Ada_Version >= Ada_2005 |
| and then Has_Matching_Entry_Or_Subprogram (S) |
| then |
| return; |
| end if; |
| |
| -- If there is no homonym then this is definitely not overriding |
| |
| if No (E) then |
| Enter_Overloaded_Entity (S); |
| Check_Dispatching_Operation (S, Empty); |
| Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
| |
| -- If subprogram has an explicit declaration, check whether it has an |
| -- overriding indicator. |
| |
| if Comes_From_Source (S) then |
| Check_Synchronized_Overriding (S, Overridden_Subp); |
| |
| -- (Ada 2012: AI05-0125-1): If S is a dispatching operation then |
| -- it may have overridden some hidden inherited primitive. Update |
| -- Overridden_Subp to avoid spurious errors when checking the |
| -- overriding indicator. |
| |
| if Ada_Version >= Ada_2012 |
| and then No (Overridden_Subp) |
| and then Is_Dispatching_Operation (S) |
| and then Present (Overridden_Operation (S)) |
| then |
| Overridden_Subp := Overridden_Operation (S); |
| end if; |
| |
| Check_Overriding_Indicator |
| (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); |
| |
| -- The Ghost policy in effect at the point of declaration of a |
| -- parent subprogram and an overriding subprogram must match |
| -- (SPARK RM 6.9(17)). |
| |
| Check_Ghost_Overriding (S, Overridden_Subp); |
| end if; |
| |
| -- If there is a homonym that is not overloadable, then we have an |
| -- error, except for the special cases checked explicitly below. |
| |
| elsif not Is_Overloadable (E) then |
| |
| -- Check for spurious conflict produced by a subprogram that has the |
| -- same name as that of the enclosing generic package. The conflict |
| -- occurs within an instance, between the subprogram and the renaming |
| -- declaration for the package. After the subprogram, the package |
| -- renaming declaration becomes hidden. |
| |
| if Ekind (E) = E_Package |
| and then Present (Renamed_Object (E)) |
| and then Renamed_Object (E) = Current_Scope |
| and then Nkind (Parent (Renamed_Object (E))) = |
| N_Package_Specification |
| and then Present (Generic_Parent (Parent (Renamed_Object (E)))) |
| then |
| Set_Is_Hidden (E); |
| Set_Is_Immediately_Visible (E, False); |
| Enter_Overloaded_Entity (S); |
| Set_Homonym (S, Homonym (E)); |
| Check_Dispatching_Operation (S, Empty); |
| Check_Overriding_Indicator (S, Empty, Is_Primitive => False); |
| |
| -- If the subprogram is implicit it is hidden by the previous |
| -- declaration. However if it is dispatching, it must appear in the |
| -- dispatch table anyway, because it can be dispatched to even if it |
| -- cannot be called directly. |
| |
| elsif Present (Alias (S)) and then not Comes_From_Source (S) then |
| Set_Scope (S, Current_Scope); |
| |
| if Is_Dispatching_Operation (Alias (S)) then |
| Check_Dispatching_Operation (S, Empty); |
| end if; |
| |
| return; |
| |
| else |
| Report_Conflict (S, E); |
| return; |
| end if; |
| |
| -- E exists and is overloadable |
| |
| else |
| Check_Synchronized_Overriding (S, Overridden_Subp); |
| |
| -- Loop through E and its homonyms to determine if any of them is |
| -- the candidate for overriding by S. |
| |
| while Present (E) loop |
| |
| -- Definitely not interesting if not in the current scope |
| |
| if Scope (E) /= Current_Scope then |
| null; |
| |
| -- A function can overload the name of an abstract state. The |
| -- state can be viewed as a function with a profile that cannot |
| -- be matched by anything. |
| |
| elsif Ekind (S) = E_Function |
| and then Ekind (E) = E_Abstract_State |
| then |
| Enter_Overloaded_Entity (S); |
| return; |
| |
| -- Ada 2012 (AI05-0165): For internally generated bodies of null |
| -- procedures locate the internally generated spec. We enforce |
| -- mode conformance since a tagged type may inherit from |
| -- interfaces several null primitives which differ only in |
| -- the mode of the formals. |
| |
| elsif not Comes_From_Source (S) |
| and then Is_Null_Procedure (S) |
| and then not Mode_Conformant (E, S) |
| then |
| null; |
| |
| -- Check if we have type conformance |
| |
| elsif Type_Conformant (E, S) then |
| |
| -- If the old and new entities have the same profile and one |
| -- is not the body of the other, then this is an error, unless |
| -- one of them is implicitly declared. |
| |
| -- There are some cases when both can be implicit, for example |
| -- when both a literal and a function that overrides it are |
| -- inherited in a derivation, or when an inherited operation |
| -- of a tagged full type overrides the inherited operation of |
| -- a private extension. Ada 83 had a special rule for the |
| -- literal case. In Ada 95, the later implicit operation hides |
| -- the former, and the literal is always the former. In the |
| -- odd case where both are derived operations declared at the |
| -- same point, both operations should be declared, and in that |
| -- case we bypass the following test and proceed to the next |
| -- part. This can only occur for certain obscure cases in |
| -- instances, when an operation on a type derived from a formal |
| -- private type does not override a homograph inherited from |
| -- the actual. In subsequent derivations of such a type, the |
| -- DT positions of these operations remain distinct, if they |
| -- have been set. |
| |
| if Present (Alias (S)) |
| and then (No (Alias (E)) |
| or else Comes_From_Source (E) |
| or else Is_Abstract_Subprogram (S) |
| or else |
| (Is_Dispatching_Operation (E) |
| and then Is_Overriding_Alias (E, S))) |
| and then Ekind (E) /= E_Enumeration_Literal |
| then |
| -- When an derived operation is overloaded it may be due to |
| -- the fact that the full view of a private extension |
| -- re-inherits. It has to be dealt with. |
| |
| if Is_Package_Or_Generic_Package (Current_Scope) |
| and then In_Private_Part (Current_Scope) |
| then |
| Check_Operation_From_Private_View (S, E); |
| end if; |
| |
| -- In any case the implicit operation remains hidden by the |
| -- existing declaration, which is overriding. Indicate that |
| -- E overrides the operation from which S is inherited. |
| |
| if Present (Alias (S)) then |
| Set_Overridden_Operation (E, Alias (S)); |
| Inherit_Subprogram_Contract (E, Alias (S)); |
| |
| else |
| Set_Overridden_Operation (E, S); |
| Inherit_Subprogram_Contract (E, S); |
| end if; |
| |
| if Comes_From_Source (E) then |
| Check_Overriding_Indicator (E, S, Is_Primitive => False); |
| |
| -- The Ghost policy in effect at the point of declaration |
| -- of a parent subprogram and an overriding subprogram |
| -- must match (SPARK RM 6.9(17)). |
| |
| Check_Ghost_Overriding (E, S); |
| end if; |
| |
| return; |
| |
| -- Within an instance, the renaming declarations for actual |
| -- subprograms may become ambiguous, but they do not hide each |
| -- other. |
| |
| elsif Ekind (E) /= E_Entry |
| and then not Comes_From_Source (E) |
| and then not Is_Generic_Instance (E) |
| and then (Present (Alias (E)) |
| or else Is_Intrinsic_Subprogram (E)) |
| and then (not In_Instance |
| or else No (Parent (E)) |
| or else Nkind (Unit_Declaration_Node (E)) /= |
| N_Subprogram_Renaming_Declaration) |
| then |
| -- A subprogram child unit is not allowed to override an |
| -- inherited subprogram (10.1.1(20)). |
| |
| if Is_Child_Unit (S) then |
| Error_Msg_N |
| ("child unit overrides inherited subprogram in parent", |
| S); |
| return; |
| end if; |
| |
| if Is_Non_Overriding_Operation (E, S) then |
| Enter_Overloaded_Entity (S); |
| |
| if No (Derived_Type) |
| or else Is_Tagged_Type (Derived_Type) |
| then |
| Check_Dispatching_Operation (S, Empty); |
| end if; |
| |
| return; |
| end if; |
| |
| -- E is a derived operation or an internal operator which |
| -- is being overridden. Remove E from further visibility. |
| -- Furthermore, if E is a dispatching operation, it must be |
| -- replaced in the list of primitive operations of its type |
| -- (see Override_Dispatching_Operation). |
| |
| Overridden_Subp := E; |
| |
| -- It is possible for E to be in the current scope and |
| -- yet not in the entity chain. This can only occur in a |
| -- generic context where E is an implicit concatenation |
| -- in the formal part, because in a generic body the |
| -- entity chain starts with the formals. |
| |
| -- In GNATprove mode, a wrapper for an operation with |
| -- axiomatization may be a homonym of another declaration |
| -- for an actual subprogram (needs refinement ???). |
| |
| if No (Prev_Entity (E)) then |
| if In_Instance |
| and then GNATprove_Mode |
| and then |
| Nkind (Original_Node (Unit_Declaration_Node (S))) = |
| N_Subprogram_Renaming_Declaration |
| then |
| return; |
| else |
| pragma Assert (Chars (E) = Name_Op_Concat); |
| null; |
| end if; |
| end if; |
| |
| -- E must be removed both from the entity_list of the |
| -- current scope, and from the visibility chain. |
| |
| if Debug_Flag_E then |
| Write_Str ("Override implicit operation "); |
| Write_Int (Int (E)); |
| Write_Eol; |
| end if; |
| |
| -- If E is a predefined concatenation, it stands for four |
| -- different operations. As a result, a single explicit |
| -- declaration does not hide it. In a possible ambiguous |
| -- situation, Disambiguate chooses the user-defined op, |
| -- so it is correct to retain the previous internal one. |
| |
| if Chars (E) /= Name_Op_Concat |
| or else Ekind (E) /= E_Operator |
| then |
| -- For nondispatching derived operations that are |
| -- overridden by a subprogram declared in the private |
| -- part of a package, we retain the derived subprogram |
| -- but mark it as not immediately visible. If the |
| -- derived operation was declared in the visible part |
| -- then this ensures that it will still be visible |
| -- outside the package with the proper signature |
| -- (calls from outside must also be directed to this |
| -- version rather than the overriding one, unlike the |
| -- dispatching case). Calls from inside the package |
| -- will still resolve to the overriding subprogram |
| -- since the derived one is marked as not visible |
| -- within the package. |
| |
| -- If the private operation is dispatching, we achieve |
| -- the overriding by keeping the implicit operation |
| -- but setting its alias to be the overriding one. In |
| -- this fashion the proper body is executed in all |
| -- cases, but the original signature is used outside |
| -- of the package. |
| |
| -- If the overriding is not in the private part, we |
| -- remove the implicit operation altogether. |
| |
| if Is_Private_Declaration (S) then |
| if not Is_Dispatching_Operation (E) then |
| Set_Is_Immediately_Visible (E, False); |
| else |
| -- Work done in Override_Dispatching_Operation, so |
| -- nothing else needs to be done here. |
| |
| null; |
| end if; |
| |
| else |
| Remove_Entity_And_Homonym (E); |
| end if; |
| end if; |
| |
| Enter_Overloaded_Entity (S); |
| |
| -- For entities generated by Derive_Subprograms the |
| -- overridden operation is the inherited primitive |
| -- (which is available through the attribute alias). |
| |
| if not (Comes_From_Source (E)) |
| and then Is_Dispatching_Operation (E) |
| and then Find_Dispatching_Type (E) = |
| Find_Dispatching_Type (S) |
| and then Present (Alias (E)) |
| and then Comes_From_Source (Alias (E)) |
| then |
| Set_Overridden_Operation (S, Alias (E)); |
| Inherit_Subprogram_Contract (S, Alias (E)); |
| |
| -- Normal case of setting entity as overridden |
| |
| -- Note: Static_Initialization and Overridden_Operation |
| -- attributes use the same field in subprogram entities. |
| -- Static_Initialization is only defined for internal |
| -- initialization procedures, where Overridden_Operation |
| -- is irrelevant. Therefore the setting of this attribute |
| -- must check whether the target is an init_proc. |
| |
| elsif not Is_Init_Proc (S) then |
| Set_Overridden_Operation (S, E); |
| Inherit_Subprogram_Contract (S, E); |
| end if; |
| |
| Check_Overriding_Indicator (S, E, Is_Primitive => True); |
| |
| -- The Ghost policy in effect at the point of declaration |
| -- of a parent subprogram and an overriding subprogram |
| -- must match (SPARK RM 6.9(17)). |
| |
| Check_Ghost_Overriding (S, E); |
| |
| -- If S is a user-defined subprogram or a null procedure |
| -- expanded to override an inherited null procedure, or a |
| -- predefined dispatching primitive then indicate that E |
| -- overrides the operation from which S is inherited. |
| |
| if Comes_From_Source (S) |
| or else |
| (Present (Parent (S)) |
| and then Nkind (Parent (S)) = N_Procedure_Specification |
| and then Null_Present (Parent (S))) |
| or else |
| (Present (Alias (E)) |
| and then |
| Is_Predefined_Dispatching_Operation (Alias (E))) |
| then |
| if Present (Alias (E)) then |
| Set_Overridden_Operation (S, Alias (E)); |
| Inherit_Subprogram_Contract (S, Alias (E)); |
| end if; |
| end if; |
| |
| if Is_Dispatching_Operation (E) then |
| |
| -- An overriding dispatching subprogram inherits the |
| -- convention of the overridden subprogram (AI-117). |
| |
| Set_Convention (S, Convention (E)); |
| Check_Dispatching_Operation (S, E); |
| |
| else |
| Check_Dispatching_Operation (S, Empty); |
| end if; |
| |
| Check_For_Primitive_Subprogram |
| (Is_Primitive_Subp, Is_Overriding => True); |
| goto Check_Inequality; |
| |
| -- Apparent redeclarations in instances can occur when two |
| -- formal types get the same actual type. The subprograms in |
| -- in the instance are legal, even if not callable from the |
| -- outside. Calls from within are disambiguated elsewhere. |
| -- For dispatching operations in the visible part, the usual |
| -- rules apply, and operations with the same profile are not |
| -- legal (B830001). |
| |
| elsif (In_Instance_Visible_Part |
| and then not Is_Dispatching_Operation (E)) |
| or else In_Instance_Not_Visible |
| then |
| null; |
| |
| -- Here we have a real error (identical profile) |
| |
| else |
| Error_Msg_Sloc := Sloc (E); |
| |
| -- Avoid cascaded errors if the entity appears in |
| -- subsequent calls. |
| |
| Set_Scope (S, Current_Scope); |
| |
| -- Generate error, with extra useful warning for the case |
| -- of a generic instance with no completion. |
| |
| if Is_Generic_Instance (S) |
| and then not Has_Completion (E) |
| then |
| Error_Msg_N |
| ("instantiation cannot provide body for&", S); |
| Error_Msg_N ("\& conflicts with declaration#", S); |
| else |
| Error_Msg_N ("& conflicts with declaration#", S); |
| end if; |
| |
| return; |
| end if; |
| |
| else |
| -- If one subprogram has an access parameter and the other |
| -- a parameter of an access type, calls to either might be |
| -- ambiguous. Verify that parameters match except for the |
| -- access parameter. |
| |
| if May_Hide_Profile then |
| declare |
| F1 : Entity_Id; |
| F2 : Entity_Id; |
| |
| begin |
| F1 := First_Formal (S); |
| F2 := First_Formal (E); |
| while Present (F1) and then Present (F2) loop |
| if Is_Access_Type (Etype (F1)) then |
| if not Is_Access_Type (Etype (F2)) |
| or else not Conforming_Types |
| (Designated_Type (Etype (F1)), |
| Designated_Type (Etype (F2)), |
| Type_Conformant) |
| then |
| May_Hide_Profile := False; |
| end if; |
| |
| elsif |
| not Conforming_Types |
| (Etype (F1), Etype (F2), Type_Conformant) |
| then |
| May_Hide_Profile := False; |
| end if; |
| |
| Next_Formal (F1); |
| Next_Formal (F2); |
| end loop; |
| |
| if May_Hide_Profile |
| and then No (F1) |
| and then No (F2) |
| then |
| Error_Msg_NE ("calls to& may be ambiguous??", S, S); |
| end if; |
| end; |
| end if; |
| end if; |
| |
| E := Homonym (E); |
| end loop; |
| |
| -- On exit, we know that S is a new entity |
| |
| Enter_Overloaded_Entity (S); |
| Check_For_Primitive_Subprogram (Is_Primitive_Subp); |
| Check_Overriding_Indicator |
| (S, Overridden_Subp, Is_Primitive => Is_Primitive_Subp); |
| |
| -- The Ghost policy in effect at the point of declaration of a parent |
| -- subprogram and an overriding subprogram must match |
| -- (SPARK RM 6.9(17)). |
| |
| Check_Ghost_Overriding (S, Overridden_Subp); |
| |
| -- Overloading is not allowed in SPARK, except for operators |
| |
| if Nkind (S) /= N_Defining_Operator_Symbol then |
| Error_Msg_Sloc := Sloc (Homonym (S)); |
| Check_SPARK_05_Restriction |
| ("overloading not allowed with entity#", S); |
| end if; |
| |
| -- If S is a derived operation for an untagged type then by |
| -- definition it's not a dispatching operation (even if the parent |
| -- operation was dispatching), so Check_Dispatching_Operation is not |
| -- called in that case. |
| |
| if No (Derived_Type) |
| or else Is_Tagged_Type (Derived_Type) |
| then |
| Check_Dispatching_Operation (S, Empty); |
| end if; |
| end if; |
| |
| -- If this is a user-defined equality operator that is not a derived |
| -- subprogram, create the corresponding inequality. If the operation is |
| -- dispatching, the expansion is done elsewhere, and we do not create |
| -- an explicit inequality operation. |
| |
| <<Check_Inequality>> |
| if Chars (S) = Name_Op_Eq |
| and then Etype (S) = Standard_Boolean |
| and then Present (Parent (S)) |
| and then not Is_Dispatching_Operation (S) |
| then |
| Make_Inequality_Operator (S); |
| Check_Untagged_Equality (S); |
| end if; |
| end New_Overloaded_Entity; |
| |
| ---------------------------------- |
| -- Preanalyze_Formal_Expression -- |
| ---------------------------------- |
| |
| procedure Preanalyze_Formal_Expression (N : Node_Id; T : Entity_Id) is |
| Save_In_Spec_Expression : constant Boolean := In_Spec_Expression; |
| begin |
| In_Spec_Expression := True; |
| Preanalyze_With_Freezing_And_Resolve (N, T); |
| In_Spec_Expression := Save_In_Spec_Expression; |
| end Preanalyze_Formal_Expression; |
| |
| --------------------- |
| -- Process_Formals -- |
| --------------------- |
| |
| procedure Process_Formals |
| (T : List_Id; |
| Related_Nod : Node_Id) |
| is |
| function Designates_From_Limited_With (Typ : Entity_Id) return Boolean; |
| -- Determine whether an access type designates a type coming from a |
| -- limited view. |
| |
| function Is_Class_Wide_Default (D : Node_Id) return Boolean; |
| -- Check whether the default has a class-wide type. After analysis the |
| -- default has the type of the formal, so we must also check explicitly |
| -- for an access attribute. |
| |
| ---------------------------------- |
| -- Designates_From_Limited_With -- |
| ---------------------------------- |
| |
| function Designates_From_Limited_With (Typ : Entity_Id) return Boolean is |
| Desig : Entity_Id := Typ; |
| |
| begin |
| if Is_Access_Type (Desig) then |
| Desig := Directly_Designated_Type (Desig); |
| end if; |
| |
| if Is_Class_Wide_Type (Desig) then |
| Desig := Root_Type (Desig); |
| end if; |
| |
| return |
| Ekind (Desig) = E_Incomplete_Type |
| and then From_Limited_With (Desig); |
| end Designates_From_Limited_With; |
| |
| --------------------------- |
| -- Is_Class_Wide_Default -- |
| --------------------------- |
| |
| function Is_Class_Wide_Default (D : Node_Id) return Boolean is |
| begin |
| return Is_Class_Wide_Type (Designated_Type (Etype (D))) |
| or else (Nkind (D) = N_Attribute_Reference |
| and then Attribute_Name (D) = Name_Access |
| and then Is_Class_Wide_Type (Etype (Prefix (D)))); |
| end Is_Class_Wide_Default; |
| |
| -- Local variables |
| |
| Context : constant Node_Id := Parent (Parent (T)); |
| Default : Node_Id; |
| Formal : Entity_Id; |
| Formal_Type : Entity_Id; |
| Param_Spec : Node_Id; |
| Ptype : Entity_Id; |
| |
| Num_Out_Params : Nat := 0; |
| First_Out_Param : Entity_Id := Empty; |
| -- Used for setting Is_Only_Out_Parameter |
| |
| -- Start of processing for Process_Formals |
| |
| begin |
| -- In order to prevent premature use of the formals in the same formal |
| -- part, the Ekind is left undefined until all default expressions are |
| -- analyzed. The Ekind is established in a separate loop at the end. |
| |
| Param_Spec := First (T); |
| while Present (Param_Spec) loop |
| Formal := Defining_Identifier (Param_Spec); |
| Set_Never_Set_In_Source (Formal, True); |
| Enter_Name (Formal); |
| |
| -- Case of ordinary parameters |
| |
| if Nkind (Parameter_Type (Param_Spec)) /= N_Access_Definition then |
| Find_Type (Parameter_Type (Param_Spec)); |
| Ptype := Parameter_Type (Param_Spec); |
| |
| if Ptype = Error then |
| goto Continue; |
| end if; |
| |
| -- Protect against malformed parameter types |
| |
| if Nkind (Ptype) not in N_Has_Entity then |
| Formal_Type := Any_Type; |
| else |
| Formal_Type := Entity (Ptype); |
| end if; |
| |
| if Is_Incomplete_Type (Formal_Type) |
| or else |
| (Is_Class_Wide_Type (Formal_Type) |
| and then Is_Incomplete_Type (Root_Type (Formal_Type))) |
| then |
| -- Ada 2005 (AI-326): Tagged incomplete types allowed in |
| -- primitive operations, as long as their completion is |
| -- in the same declarative part. If in the private part |
| -- this means that the type cannot be a Taft-amendment type. |
| -- Check is done on package exit. For access to subprograms, |
| -- the use is legal for Taft-amendment types. |
| |
| -- Ada 2012: tagged incomplete types are allowed as generic |
| -- formal types. They do not introduce dependencies and the |
| -- corresponding generic subprogram does not have a delayed |
| -- freeze, because it does not need a freeze node. However, |
| -- it is still the case that untagged incomplete types cannot |
| -- be Taft-amendment types and must be completed in private |
| -- part, so the subprogram must appear in the list of private |
| -- dependents of the type. |
| |
| if Is_Tagged_Type (Formal_Type) |
| or else (Ada_Version >= Ada_2012 |
| and then not From_Limited_With (Formal_Type) |
| and then not Is_Generic_Type (Formal_Type)) |
| then |
| if Ekind (Scope (Current_Scope)) = E_Package |
| and then not Is_Generic_Type (Formal_Type) |
| and then not Is_Class_Wide_Type (Formal_Type) |
| then |
| if not Nkind_In |
| (Parent (T), N_Access_Function_Definition, |
| N_Access_Procedure_Definition) |
| then |
| Append_Elmt (Current_Scope, |
| Private_Dependents (Base_Type (Formal_Type))); |
| |
| -- Freezing is delayed to ensure that Register_Prim |
| -- will get called for this operation, which is needed |
| -- in cases where static dispatch tables aren't built. |
| -- (Note that the same is done for controlling access |
| -- parameter cases in function Access_Definition.) |
| |
| if not Is_Thunk (Current_Scope) then |
| Set_Has_Delayed_Freeze (Current_Scope); |
| end if; |
| end if; |
| end if; |
| |
| elsif not Nkind_In (Parent (T), N_Access_Function_Definition, |
| N_Access_Procedure_Definition) |
| then |
| -- AI05-0151: Tagged incomplete types are allowed in all |
| -- formal parts. Untagged incomplete types are not allowed |
| -- in bodies. Limited views of either kind are not allowed |
| -- if there is no place at which the non-limited view can |
| -- become available. |
| |
| -- Incomplete formal untagged types are not allowed in |
| -- subprogram bodies (but are legal in their declarations). |
| -- This excludes bodies created for null procedures, which |
| -- are basic declarations. |
| |
| if Is_Generic_Type (Formal_Type) |
| and then not Is_Tagged_Type (Formal_Type) |
| and then Nkind (Parent (Related_Nod)) = N_Subprogram_Body |
| then |
| Error_Msg_N |
| ("invalid use of formal incomplete type", Param_Spec); |
| |
| elsif Ada_Version >= Ada_2012 then |
| if Is_Tagged_Type (Formal_Type) |
| and then (not From_Limited_With (Formal_Type) |
| or else not In_Package_Body) |
| then |
| null; |
| |
| elsif Nkind_In (Context, N_Accept_Statement, |
| N_Accept_Alternative, |
| N_Entry_Body) |
| or else (Nkind (Context) = N_Subprogram_Body |
| and then Comes_From_Source (Context)) |
| then |
| Error_Msg_NE |
| ("invalid use of untagged incomplete type &", |
| Ptype, Formal_Type); |
| end if; |
| |
| else |
| Error_Msg_NE |
| ("invalid use of incomplete type&", |
| Param_Spec, Formal_Type); |
| |
| -- Further checks on the legality of incomplete types |
| -- in formal parts are delayed until the freeze point |
| -- of the enclosing subprogram or access to subprogram. |
| end if; |
| end if; |
| |
| elsif Ekind (Formal_Type) = E_Void then |
| Error_Msg_NE |
| ("premature use of&", |
| Parameter_Type (Param_Spec), Formal_Type); |
| end if; |
| |
| -- Ada 2012 (AI-142): Handle aliased parameters |
| |
| if Ada_Version >= Ada_2012 |
| and then Aliased_Present (Param_Spec) |
| then |
| Set_Is_Aliased (Formal); |
| |
| -- AI12-001: All aliased objects are considered to be specified |
| -- as independently addressable (RM C.6(8.1/4)). |
| |
| Set_Is_Independent (Formal); |
| end if; |
| |
| -- Ada 2005 (AI-231): Create and decorate an internal subtype |
| -- declaration corresponding to the null-excluding type of the |
| -- formal in the enclosing scope. Finally, replace the parameter |
| -- type of the formal with the internal subtype. |
| |
| if Ada_Version >= Ada_2005 |
| and then Null_Exclusion_Present (Param_Spec) |
| then |
| if not Is_Access_Type (Formal_Type) then |
| Error_Msg_N |
| ("`NOT NULL` allowed only for an access type", Param_Spec); |
| |
| else |
| if Can_Never_Be_Null (Formal_Type) |
| and then Comes_From_Source (Related_Nod) |
| then |
| Error_Msg_NE |
| ("`NOT NULL` not allowed (& already excludes null)", |
| Param_Spec, Formal_Type); |
| end if; |
| |
| Formal_Type := |
| Create_Null_Excluding_Itype |
| (T => Formal_Type, |
| Related_Nod => Related_Nod, |
| Scope_Id => Scope (Current_Scope)); |
| |
| -- If the designated type of the itype is an itype that is |
| -- not frozen yet, we set the Has_Delayed_Freeze attribute |
| -- on the access subtype, to prevent order-of-elaboration |
| -- issues in the backend. |
| |
| -- Example: |
| -- type T is access procedure; |
| -- procedure Op (O : not null T); |
| |
| if Is_Itype (Directly_Designated_Type (Formal_Type)) |
| and then |
| not Is_Frozen (Directly_Designated_Type (Formal_Type)) |
| then |
| Set_Has_Delayed_Freeze (Formal_Type); |
| end if; |
| end if; |
| end if; |
| |
| -- An access formal type |
| |
| else |
| Formal_Type := |
| Access_Definition (Related_Nod, Parameter_Type (Param_Spec)); |
| |
| -- No need to continue if we already notified errors |
| |
| if not Present (Formal_Type) then |
| return; |
| end if; |
| |
| -- Ada 2005 (AI-254) |
| |
| declare |
| AD : constant Node_Id := |
| Access_To_Subprogram_Definition |
| (Parameter_Type (Param_Spec)); |
| begin |
| if Present (AD) and then Protected_Present (AD) then |
| Formal_Type := |
| Replace_Anonymous_Access_To_Protected_Subprogram |
| (Param_Spec); |
| end if; |
| end; |
| end if; |
| |
| Set_Etype (Formal, Formal_Type); |
| |
| -- Deal with default expression if present |
| |
| Default := Expression (Param_Spec); |
| |
| if Present (Default) then |
| Check_SPARK_05_Restriction |
| ("default expression is not allowed", Default); |
| |
| if Out_Present (Param_Spec) then |
| Error_Msg_N |
| ("default initialization only allowed for IN parameters", |
| Param_Spec); |
| end if; |
| |
| -- Do the special preanalysis of the expression (see section on |
| -- "Handling of Default Expressions" in the spec of package Sem). |
| |
| Preanalyze_Formal_Expression (Default, Formal_Type); |
| |
| -- An access to constant cannot be the default for |
| -- an access parameter that is an access to variable. |
| |
| if Ekind (Formal_Type) = E_Anonymous_Access_Type |
| and then not Is_Access_Constant (Formal_Type) |
| and then Is_Access_Type (Etype (Default)) |
| and then Is_Access_Constant (Etype (Default)) |
| then |
| Error_Msg_N |
| ("formal that is access to variable cannot be initialized " |
| & "with an access-to-constant expression", Default); |
| end if; |
| |
| -- Check that the designated type of an access parameter's default |
| -- is not a class-wide type unless the parameter's designated type |
| -- is also class-wide. |
| |
| if Ekind (Formal_Type) = E_Anonymous_Access_Type |
| and then not Designates_From_Limited_With (Formal_Type) |
| and then Is_Class_Wide_Default (Default) |
| and then not Is_Class_Wide_Type (Designated_Type (Formal_Type)) |
| then |
| Error_Msg_N |
| ("access to class-wide expression not allowed here", Default); |
| end if; |
| |
| -- Check incorrect use of dynamically tagged expressions |
| |
| if Is_Tagged_Type (Formal_Type) then |
| Check_Dynamically_Tagged_Expression |
| (Expr => Default, |
| Typ => Formal_Type, |
| Related_Nod => Default); |
| end if; |
| end if; |
| |
| -- Ada 2005 (AI-231): Static checks |
| |
| if Ada_Version >= Ada_2005 |
| and then Is_Access_Type (Etype (Formal)) |
| and then Can_Never_Be_Null (Etype (Formal)) |
| then |
| Null_Exclusion_Static_Checks (Param_Spec); |
| end if; |
| |
| -- The following checks are relevant only when SPARK_Mode is on as |
| -- these are not standard Ada legality rules. |
| |
| if SPARK_Mode = On then |
| if Ekind_In (Scope (Formal), E_Function, E_Generic_Function) then |
| |
| -- A function cannot have a parameter of mode IN OUT or OUT |
| -- (SPARK RM 6.1). |
| |
| if Ekind_In (Formal, E_In_Out_Parameter, E_Out_Parameter) then |
| Error_Msg_N |
| ("function cannot have parameter of mode `OUT` or " |
| & "`IN OUT`", Formal); |
| end if; |
| |
| -- A procedure cannot have an effectively volatile formal |
| -- parameter of mode IN because it behaves as a constant |
| -- (SPARK RM 7.1.3(6)). -- ??? maybe 7.1.3(4) |
| |
| elsif Ekind (Scope (Formal)) = E_Procedure |
| and then Ekind (Formal) = E_In_Parameter |
| and then Is_Effectively_Volatile (Formal) |
| then |
| Error_Msg_N |
| ("formal parameter of mode `IN` cannot be volatile", Formal); |
| end if; |
| end if; |
| |
| <<Continue>> |
| Next (Param_Spec); |
| end loop; |
| |
| -- If this is the formal part of a function specification, analyze the |
| -- subtype mark in the context where the formals are visible but not |
| -- yet usable, and may hide outer homographs. |
| |
| if Nkind (Related_Nod) = N_Function_Specification then |
| Analyze_Return_Type (Related_Nod); |
| end if; |
| |
| -- Now set the kind (mode) of each formal |
| |
| Param_Spec := First (T); |
| while Present (Param_Spec) loop |
| Formal := Defining_Identifier (Param_Spec); |
| Set_Formal_Mode (Formal); |
| |
| if Ekind (Formal) = E_In_Parameter then |
| Set_Default_Value (Formal, Expression (Param_Spec)); |
| |
| if Present (Expression (Param_Spec)) then |
| Default := Expression (Param_Spec); |
| |
| if Is_Scalar_Type (Etype (Default)) then |
| if Nkind (Parameter_Type (Param_Spec)) /= |
| N_Access_Definition |
| then |
| Formal_Type := Entity (Parameter_Type (Param_Spec)); |
| else |
| Formal_Type := |
| Access_Definition |
| (Related_Nod, Parameter_Type (Param_Spec)); |
| end if; |
| |
| Apply_Scalar_Range_Check (Default, Formal_Type); |
| end if; |
| end if; |
| |
| elsif Ekind (Formal) = E_Out_Parameter then |
| Num_Out_Params := Num_Out_Params + 1; |
| |
| if Num_Out_Params = 1 then |
| First_Out_Param := Formal; |
| end if; |
| |
| elsif Ekind (Formal) = E_In_Out_Parameter then |
| Num_Out_Params := Num_Out_Params + 1; |
| end if; |
| |
| -- Skip remaining processing if formal type was in error |
| |
| if Etype (Formal) = Any_Type or else Error_Posted (Formal) then |
| goto Next_Parameter; |
| end if; |
| |
| -- Force call by reference if aliased |
| |
| declare |
| Conv : constant Convention_Id := Convention (Etype (Formal)); |
| begin |
| if Is_Aliased (Formal) then |
| Set_Mechanism (Formal, By_Reference); |
| |
| -- Warn if user asked this to be passed by copy |
| |
| if Conv = Convention_Ada_Pass_By_Copy then |
| Error_Msg_N |
| ("cannot pass aliased parameter & by copy??", Formal); |
| end if; |
| |
| -- Force mechanism if type has Convention Ada_Pass_By_Ref/Copy |
| |
| elsif Conv = Convention_Ada_Pass_By_Copy then |
| Set_Mechanism (Formal, By_Copy); |
| |
| elsif Conv = Convention_Ada_Pass_By_Reference then |
| Set_Mechanism (Formal, By_Reference); |
| end if; |
| end; |
| |
| <<Next_Parameter>> |
| Next (Param_Spec); |
| end loop; |
| |
| if Present (First_Out_Param) and then Num_Out_Params = 1 then |
| Set_Is_Only_Out_Parameter (First_Out_Param); |
| end if; |
| end Process_Formals; |
| |
| ---------------------------- |
| -- Reference_Body_Formals -- |
| ---------------------------- |
| |
| procedure Reference_Body_Formals (Spec : Entity_Id; Bod : Entity_Id) is |
| Fs : Entity_Id; |
| Fb : Entity_Id; |
| |
| begin |
| if Error_Posted (Spec) then |
| return; |
| end if; |
| |
| -- Iterate over both lists. They may be of different lengths if the two |
| -- specs are not conformant. |
| |
| Fs := First_Formal (Spec); |
| Fb := First_Formal (Bod); |
| while Present (Fs) and then Present (Fb) loop |
| Generate_Reference (Fs, Fb, 'b'); |
| |
| if Style_Check then |
| Style.Check_Identifier (Fb, Fs); |
| end if; |
| |
| Set_Spec_Entity (Fb, Fs); |
| Set_Referenced (Fs, False); |
| Next_Formal (Fs); |
| Next_Formal (Fb); |
| end loop; |
| end Reference_Body_Formals; |
| |
| ------------------------- |
| -- Set_Actual_Subtypes -- |
| ------------------------- |
| |
| procedure Set_Actual_Subtypes (N : Node_Id; Subp : Entity_Id) is |
| Decl : Node_Id; |
| Formal : Entity_Id; |
| T : Entity_Id; |
| First_Stmt : Node_Id := Empty; |
| AS_Needed : Boolean; |
| |
| begin |
| -- If this is an empty initialization procedure, no need to create |
| -- actual subtypes (small optimization). |
| |
| if Ekind (Subp) = E_Procedure and then Is_Null_Init_Proc (Subp) then |
| return; |
| |
| -- Within a predicate function we do not want to generate local |
| -- subtypes that may generate nested predicate functions. |
| |
| elsif Is_Subprogram (Subp) and then Is_Predicate_Function (Subp) then |
| return; |
| end if; |
| |
| -- The subtype declarations may freeze the formals. The body generated |
| -- for an expression function is not a freeze point, so do not emit |
| -- these declarations (small loss of efficiency in rare cases). |
| |
| if Nkind (N) = N_Subprogram_Body |
| and then Was_Expression_Function (N) |
| then |
| return; |
| end if; |
| |
| Formal := First_Formal (Subp); |
| while Present (Formal) loop |
| T := Etype (Formal); |
| |
| -- We never need an actual subtype for a constrained formal |
| |
| if Is_Constrained (T) then |
| AS_Needed := False; |
| |
| -- If we have unknown discriminants, then we do not need an actual |
| -- subtype, or more accurately we cannot figure it out. Note that |
| -- all class-wide types have unknown discriminants. |
| |
| elsif Has_Unknown_Discriminants (T) then |
| AS_Needed := False; |
| |
| -- At this stage we have an unconstrained type that may need an |
| -- actual subtype. For sure the actual subtype is needed if we have |
| -- an unconstrained array type. However, in an instance, the type |
| -- may appear as a subtype of the full view, while the actual is |
| -- in fact private (in which case no actual subtype is needed) so |
| -- check the kind of the base type. |
| |
| elsif Is_Array_Type (Base_Type (T)) then |
| AS_Needed := True; |
| |
| -- The only other case needing an actual subtype is an unconstrained |
| -- record type which is an IN parameter (we cannot generate actual |
| -- subtypes for the OUT or IN OUT case, since an assignment can |
| -- change the discriminant values. However we exclude the case of |
| -- initialization procedures, since discriminants are handled very |
| -- specially in this context, see the section entitled "Handling of |
| -- Discriminants" in Einfo. |
| |
| -- We also exclude the case of Discrim_SO_Functions (functions used |
| -- in front-end layout mode for size/offset values), since in such |
| -- functions only discriminants are referenced, and not only are such |
| -- subtypes not needed, but they cannot always be generated, because |
| -- of order of elaboration issues. |
| |
| elsif Is_Record_Type (T) |
| and then Ekind (Formal) = E_In_Parameter |
| and then Chars (Formal) /= Name_uInit |
| and then not Is_Unchecked_Union (T) |
| and then not Is_Discrim_SO_Function (Subp) |
| then |
| AS_Needed := True; |
| |
| -- All other cases do not need an actual subtype |
| |
| else |
| AS_Needed := False; |
| end if; |
| |
| -- Generate actual subtypes for unconstrained arrays and |
| -- unconstrained discriminated records. |
| |
| if AS_Needed then |
| if Nkind (N) = N_Accept_Statement then |
| |
| -- If expansion is active, the formal is replaced by a local |
| -- variable that renames the corresponding entry of the |
| -- parameter block, and it is this local variable that may |
| -- require an actual subtype. |
| |
| if Expander_Active then |
| Decl := Build_Actual_Subtype (T, Renamed_Object (Formal)); |
| else |
| Decl := Build_Actual_Subtype (T, Formal); |
| end if; |
| |
| if Present (Handled_Statement_Sequence (N)) then |
| First_Stmt := |
| First (Statements (Handled_Statement_Sequence (N))); |
| Prepend (Decl, Statements (Handled_Statement_Sequence (N))); |
| Mark_Rewrite_Insertion (Decl); |
| else |
| -- If the accept statement has no body, there will be no |
| -- reference to the actuals, so no need to compute actual |
| -- subtypes. |
| |
| return; |
| end if; |
| |
| else |
| Decl := Build_Actual_Subtype (T, Formal); |
| Prepend (Decl, Declarations (N)); |
| Mark_Rewrite_Insertion (Decl); |
| end if; |
| |
| -- The declaration uses the bounds of an existing object, and |
| -- therefore needs no constraint checks. |
| |
| Analyze (Decl, Suppress => All_Checks); |
| Set_Is_Actual_Subtype (Defining_Identifier (Decl)); |
| |
| -- We need to freeze manually the generated type when it is |
| -- inserted anywhere else than in a declarative part. |
| |
| if Present (First_Stmt) then |
| Insert_List_Before_And_Analyze (First_Stmt, |
| Freeze_Entity (Defining_Identifier (Decl), N)); |
| |
| -- Ditto if the type has a dynamic predicate, because the |
| -- generated function will mention the actual subtype. The |
| -- predicate may come from an explicit aspect of be inherited. |
| |
| elsif Has_Predicates (T) then |
| Insert_List_After_And_Analyze (Decl, |
| Freeze_Entity (Defining_Identifier (Decl), N)); |
| end if; |
| |
| if Nkind (N) = N_Accept_Statement |
| and then Expander_Active |
| then |
| Set_Actual_Subtype (Renamed_Object (Formal), |
| Defining_Identifier (Decl)); |
| else |
| Set_Actual_Subtype (Formal, Defining_Identifier (Decl)); |
| end if; |
| end if; |
| |
| Next_Formal (Formal); |
| end loop; |
| end Set_Actual_Subtypes; |
| |
| --------------------- |
| -- Set_Formal_Mode -- |
| --------------------- |
| |
| procedure Set_Formal_Mode (Formal_Id : Entity_Id) is |
| Spec : constant Node_Id := Parent (Formal_Id); |
| Id : constant Entity_Id := Scope (Formal_Id); |
| |
| begin |
| -- Note: we set Is_Known_Valid for IN parameters and IN OUT parameters |
| -- since we ensure that corresponding actuals are always valid at the |
| -- point of the call. |
| |
| if Out_Present (Spec) then |
| if Ekind_In (Id, E_Entry, E_Entry_Family) |
| or else Is_Subprogram_Or_Generic_Subprogram (Id) |
| then |
| Set_Has_Out_Or_In_Out_Parameter (Id, True); |
| end if; |
| |
| if Ekind_In (Id, E_Function, E_Generic_Function) then |
| |
| -- [IN] OUT parameters allowed for functions in Ada 2012 |
| |
| if Ada_Version >= Ada_2012 then |
| |
| -- Even in Ada 2012 operators can only have IN parameters |
| |
| if Is_Operator_Symbol_Name (Chars (Scope (Formal_Id))) then |
| Error_Msg_N ("operators can only have IN parameters", Spec); |
| end if; |
| |
| if In_Present (Spec) then |
| Set_Ekind (Formal_Id, E_In_Out_Parameter); |
| else |
| Set_Ekind (Formal_Id, E_Out_Parameter); |
| end if; |
| |
| -- But not in earlier versions of Ada |
| |
| else |
| Error_Msg_N ("functions can only have IN parameters", Spec); |
| Set_Ekind (Formal_Id, E_In_Parameter); |
| end if; |
| |
| elsif In_Present (Spec) then |
| Set_Ekind (Formal_Id, E_In_Out_Parameter); |
| |
| else |
| Set_Ekind (Formal_Id, E_Out_Parameter); |
| Set_Never_Set_In_Source (Formal_Id, True); |
| Set_Is_True_Constant (Formal_Id, False); |
| Set_Current_Value (Formal_Id, Empty); |
| end if; |
| |
| else |
| Set_Ekind (Formal_Id, E_In_Parameter); |
| end if; |
| |
| -- Set Is_Known_Non_Null for access parameters since the language |
| -- guarantees that access parameters are always non-null. We also set |
| -- Can_Never_Be_Null, since there is no way to change the value. |
| |
| if Nkind (Parameter_Type (Spec)) = N_Access_Definition then |
| |
| -- Ada 2005 (AI-231): In Ada 95, access parameters are always non- |
| -- null; In Ada 2005, only if then null_exclusion is explicit. |
| |
| if Ada_Version < Ada_2005 |
| or else Can_Never_Be_Null (Etype (Formal_Id)) |
| then |
| Set_Is_Known_Non_Null (Formal_Id); |
| Set_Can_Never_Be_Null (Formal_Id); |
| end if; |
| |
| -- Ada 2005 (AI-231): Null-exclusion access subtype |
| |
| elsif Is_Access_Type (Etype (Formal_Id)) |
| and then Can_Never_Be_Null (Etype (Formal_Id)) |
| then |
| Set_Is_Known_Non_Null (Formal_Id); |
| |
| -- We can also set Can_Never_Be_Null (thus preventing some junk |
| -- access checks) for the case of an IN parameter, which cannot |
| -- be changed, or for an IN OUT parameter, which can be changed but |
| -- not to a null value. But for an OUT parameter, the initial value |
| -- passed in can be null, so we can't set this flag in that case. |
| |
| if Ekind (Formal_Id) /= E_Out_Parameter then |
| Set_Can_Never_Be_Null (Formal_Id); |
| end if; |
| end if; |
| |
| Set_Mechanism (Formal_Id, Default_Mechanism); |
| Set_Formal_Validity (Formal_Id); |
| end Set_Formal_Mode; |
| |
| ------------------------- |
| -- Set_Formal_Validity -- |
| ------------------------- |
| |
| procedure Set_Formal_Validity (Formal_Id : Entity_Id) is |
| begin |
| -- If no validity checking, then we cannot assume anything about the |
| -- validity of parameters, since we do not know there is any checking |
| -- of the validity on the call side. |
| |
| if not Validity_Checks_On then |
| return; |
| |
| -- If validity checking for parameters is enabled, this means we are |
| -- not supposed to make any assumptions about argument values. |
| |
| elsif Validity_Check_Parameters then |
| return; |
| |
| -- If we are checking in parameters, we will assume that the caller is |
| -- also checking parameters, so we can assume the parameter is valid. |
| |
| elsif Ekind (Formal_Id) = E_In_Parameter |
| and then Validity_Check_In_Params |
| then |
| Set_Is_Known_Valid (Formal_Id, True); |
| |
| -- Similar treatment for IN OUT parameters |
| |
| elsif Ekind (Formal_Id) = E_In_Out_Parameter |
| and then Validity_Check_In_Out_Params |
| then |
| Set_Is_Known_Valid (Formal_Id, True); |
| end if; |
| end Set_Formal_Validity; |
| |
| ------------------------ |
| -- Subtype_Conformant -- |
| ------------------------ |
| |
| function Subtype_Conformant |
| (New_Id : Entity_Id; |
| Old_Id : Entity_Id; |
| Skip_Controlling_Formals : Boolean := False) return Boolean |
| is |
| Result : Boolean; |
| begin |
| Check_Conformance (New_Id, Old_Id, Subtype_Conformant, False, Result, |
| Skip_Controlling_Formals => Skip_Controlling_Formals); |
| return Result; |
| end Subtype_Conformant; |
| |
| --------------------- |
| -- Type_Conformant -- |
| --------------------- |
| |
| function Type_Conformant |
| (New_Id : Entity_Id; |
| Old_Id : Entity_Id; |
| Skip_Controlling_Formals : Boolean := False) return Boolean |
| is |
| Result : Boolean; |
| begin |
| May_Hide_Profile := False; |
| Check_Conformance |
| (New_Id, Old_Id, Type_Conformant, False, Result, |
| Skip_Controlling_Formals => Skip_Controlling_Formals); |
| return Result; |
| end Type_Conformant; |
| |
| ------------------------------- |
| -- Valid_Operator_Definition -- |
| ------------------------------- |
| |
| procedure Valid_Operator_Definition (Designator : Entity_Id) is |
| N : Integer := 0; |
| F : Entity_Id; |
| Id : constant Name_Id := Chars (Designator); |
| N_OK : Boolean; |
| |
| begin |
| F := First_Formal (Designator); |
| while Present (F) loop |
| N := N + 1; |
| |
| if Present (Default_Value (F)) then |
| Error_Msg_N |
| ("default values not allowed for operator parameters", |
| Parent (F)); |
| |
| -- For function instantiations that are operators, we must check |
| -- separately that the corresponding generic only has in-parameters. |
| -- For subprogram declarations this is done in Set_Formal_Mode. Such |
| -- an error could not arise in earlier versions of the language. |
| |
| elsif Ekind (F) /= E_In_Parameter then |
| Error_Msg_N ("operators can only have IN parameters", F); |
| end if; |
| |
| Next_Formal (F); |
| end loop; |
| |
| -- Verify that user-defined operators have proper number of arguments |
| -- First case of operators which can only be unary |
| |
| if Nam_In (Id, Name_Op_Not, Name_Op_Abs) then |
| N_OK := (N = 1); |
| |
| -- Case of operators which can be unary or binary |
| |
| elsif Nam_In (Id, Name_Op_Add, Name_Op_Subtract) then |
| N_OK := (N in 1 .. 2); |
| |
| -- All other operators can only be binary |
| |
| else |
| N_OK := (N = 2); |
| end if; |
| |
| if not N_OK then |
| Error_Msg_N |
| ("incorrect number of arguments for operator", Designator); |
| end if; |
| |
| if Id = Name_Op_Ne |
| and then Base_Type (Etype (Designator)) = Standard_Boolean |
| and then not Is_Intrinsic_Subprogram (Designator) |
| then |
| Error_Msg_N |
| ("explicit definition of inequality not allowed", Designator); |
| end if; |
| end Valid_Operator_Definition; |
| |
| end Sem_Ch6; |