| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S E M _ C H 6 -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 1992-2015, 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 Types; use Types; |
| package Sem_Ch6 is |
| |
| type Conformance_Type is |
| (Type_Conformant, Mode_Conformant, Subtype_Conformant, Fully_Conformant); |
| pragma Ordered (Conformance_Type); |
| -- Conformance type used in conformance checks between specs and bodies, |
| -- and for overriding. The literals match the RM definitions of the |
| -- corresponding terms. This is an ordered type, since each conformance |
| -- type is stronger than the ones preceding it. |
| |
| procedure Analyze_Abstract_Subprogram_Declaration (N : Node_Id); |
| procedure Analyze_Expression_Function (N : Node_Id); |
| procedure Analyze_Extended_Return_Statement (N : Node_Id); |
| procedure Analyze_Function_Call (N : Node_Id); |
| procedure Analyze_Operator_Symbol (N : Node_Id); |
| procedure Analyze_Parameter_Association (N : Node_Id); |
| procedure Analyze_Procedure_Call (N : Node_Id); |
| procedure Analyze_Simple_Return_Statement (N : Node_Id); |
| procedure Analyze_Subprogram_Declaration (N : Node_Id); |
| procedure Analyze_Subprogram_Body (N : Node_Id); |
| |
| procedure Analyze_Subprogram_Body_Contract (Body_Id : Entity_Id); |
| -- Analyze all delayed aspects chained on the contract of subprogram body |
| -- Body_Id as if they appeared at the end of a declarative region. Aspects |
| -- in question are: |
| -- Contract_Cases (stand alone body) |
| -- Depends (stand alone body) |
| -- Global (stand alone body) |
| -- Postcondition (stand alone body) |
| -- Precondition (stand alone body) |
| -- Refined_Depends |
| -- Refined_Global |
| -- Refined_Post |
| -- Test_Case (stand alone body) |
| |
| procedure Analyze_Subprogram_Contract (Subp_Id : Entity_Id); |
| -- Analyze all delayed aspects chained on the contract of subprogram |
| -- Subp_Id as if they appeared at the end of a declarative region. The |
| -- aspects in question are: |
| -- Contract_Cases |
| -- Depends |
| -- Global |
| -- Postcondition |
| -- Precondition |
| -- Test_Case |
| |
| function Analyze_Subprogram_Specification (N : Node_Id) return Entity_Id; |
| -- Analyze subprogram specification in both subprogram declarations |
| -- and body declarations. Returns the defining entity for the |
| -- specification N. |
| |
| procedure Check_Conventions (Typ : Entity_Id); |
| -- Ada 2005 (AI-430): Check that the conventions of all inherited and |
| -- overridden dispatching operations of type Typ are consistent with their |
| -- respective counterparts. |
| |
| procedure Check_Delayed_Subprogram (Designator : Entity_Id); |
| -- Designator can be a E_Subprogram_Type, E_Procedure or E_Function. If a |
| -- type in its profile depends on a private type without a full |
| -- declaration, indicate that the subprogram or type is delayed. |
| |
| procedure Check_Discriminant_Conformance |
| (N : Node_Id; |
| Prev : Entity_Id; |
| Prev_Loc : Node_Id); |
| -- Check that the discriminants of a full type N fully conform to the |
| -- discriminants of the corresponding partial view Prev. Prev_Loc indicates |
| -- the source location of the partial view, which may be different than |
| -- Prev in the case of private types. |
| |
| procedure Check_Fully_Conformant |
| (New_Id : Entity_Id; |
| Old_Id : Entity_Id; |
| Err_Loc : Node_Id := Empty); |
| -- Check that two callable entities (subprograms, entries, literals) |
| -- are fully conformant, post error message if not (RM 6.3.1(17)) with |
| -- the flag being placed on the Err_Loc node if it is specified, and |
| -- on the appropriate component of the New_Id construct if not. Note: |
| -- when checking spec/body conformance, New_Id must be the body entity |
| -- and Old_Id is the spec entity (the code in the implementation relies |
| -- on this ordering, and in any case, this makes sense, since if flags |
| -- are to be placed on the construct, they clearly belong on the body. |
| |
| procedure Check_Mode_Conformant |
| (New_Id : Entity_Id; |
| Old_Id : Entity_Id; |
| Err_Loc : Node_Id := Empty; |
| Get_Inst : Boolean := False); |
| -- Check that two callable entities (subprograms, entries, literals) |
| -- are mode conformant, post error message if not (RM 6.3.1(15)) with |
| -- the flag being placed on the Err_Loc node if it is specified, and |
| -- on the appropriate component of the New_Id construct if not. The |
| -- argument Get_Inst is set to True when this is a check against a |
| -- formal access-to-subprogram type, indicating that mapping of types |
| -- is needed. |
| |
| procedure Check_Overriding_Indicator |
| (Subp : Entity_Id; |
| Overridden_Subp : Entity_Id; |
| Is_Primitive : Boolean); |
| -- Verify the consistency of an overriding_indicator given for subprogram |
| -- declaration, body, renaming, or instantiation. Overridden_Subp is set |
| -- if the scope where we are introducing the subprogram contains a |
| -- type-conformant subprogram that becomes hidden by the new subprogram. |
| -- Is_Primitive indicates whether the subprogram is primitive. |
| |
| 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); |
| -- Check that two callable entities (subprograms, entries, literals) |
| -- are subtype conformant, post error message if not (RM 6.3.1(16)), |
| -- the flag being placed on the Err_Loc node if it is specified, and |
| -- on the appropriate component of the New_Id construct if not. |
| -- Skip_Controlling_Formals is True when checking the conformance of |
| -- a subprogram that implements an interface operation. In that case, |
| -- only the non-controlling formals can (and must) be examined. The |
| -- argument Get_Inst is set to True when this is a check against a |
| -- formal access-to-subprogram type, indicating that mapping of types |
| -- is needed. |
| |
| procedure Check_Type_Conformant |
| (New_Id : Entity_Id; |
| Old_Id : Entity_Id; |
| Err_Loc : Node_Id := Empty); |
| -- Check that two callable entities (subprograms, entries, literals) |
| -- are type conformant, post error message if not (RM 6.3.1(14)) with |
| -- the flag being placed on the Err_Loc node if it is specified, and |
| -- on the appropriate component of the New_Id construct if not. |
| |
| function Conforming_Types |
| (T1 : Entity_Id; |
| T2 : Entity_Id; |
| Ctype : Conformance_Type; |
| Get_Inst : Boolean := False) return Boolean; |
| -- Check that the types of two formal parameters are conforming. In most |
| -- cases this is just a name comparison, but within an instance it involves |
| -- generic actual types, and in the presence of anonymous access types |
| -- it must examine the designated types. The argument Get_Inst is set to |
| -- True when this is a check against a formal access-to-subprogram type, |
| -- indicating that mapping of types is needed. |
| |
| procedure Create_Extra_Formals (E : Entity_Id); |
| -- For each parameter of a subprogram or entry that requires an additional |
| -- formal (such as for access parameters and indefinite discriminated |
| -- parameters), creates the appropriate formal and attach it to its |
| -- associated parameter. Each extra formal will also be appended to |
| -- the end of Subp's parameter list (with each subsequent extra formal |
| -- being attached to the preceding extra formal). |
| |
| function Find_Corresponding_Spec |
| (N : Node_Id; |
| Post_Error : Boolean := True) return Entity_Id; |
| -- Use the subprogram specification in the body to retrieve the previous |
| -- subprogram declaration, if any. |
| |
| function Fully_Conformant (New_Id, Old_Id : Entity_Id) return Boolean; |
| -- Determine whether two callable entities (subprograms, entries, |
| -- literals) are fully conformant (RM 6.3.1(17)) |
| |
| function Fully_Conformant_Expressions |
| (Given_E1 : Node_Id; |
| Given_E2 : Node_Id) return Boolean; |
| -- Determines if two (non-empty) expressions are fully conformant |
| -- as defined by (RM 6.3.1(18-21)) |
| |
| function Fully_Conformant_Discrete_Subtypes |
| (Given_S1 : Node_Id; |
| Given_S2 : Node_Id) return Boolean; |
| -- Determines if two subtype definitions are fully conformant. Used |
| -- for entry family conformance checks (RM 6.3.1 (24)). |
| |
| procedure Install_Entity (E : Entity_Id); |
| -- Place a single entity on the visibility chain |
| |
| procedure Install_Formals (Id : Entity_Id); |
| -- On entry to a subprogram body, make the formals visible. Note that |
| -- simply placing the subprogram on the scope stack is not sufficient: |
| -- the formals must become the current entities for their names. This |
| -- procedure is also used to get visibility to the formals when analyzing |
| -- preconditions and postconditions appearing in the spec. |
| |
| function Is_Interface_Conformant |
| (Tagged_Type : Entity_Id; |
| Iface_Prim : Entity_Id; |
| Prim : Entity_Id) return Boolean; |
| -- Returns true if both primitives have a matching name (including support |
| -- for names of inherited private primitives --which have suffix 'P'), they |
| -- are type conformant, and Prim is defined in the scope of Tagged_Type. |
| -- Special management is done for functions returning interfaces. |
| |
| procedure List_Inherited_Pre_Post_Aspects (E : Entity_Id); |
| -- E is the entity for a subprogram or generic subprogram spec. This call |
| -- lists all inherited Pre/Post aspects if List_Inherited_Pre_Post is True. |
| |
| procedure May_Need_Actuals (Fun : Entity_Id); |
| -- Flag functions that can be called without parameters, i.e. those that |
| -- have no parameters, or those for which defaults exist for all parameters |
| -- Used for subprogram declarations and for access subprogram declarations, |
| -- where they apply to the anonymous designated type. On return the flag |
| -- Set_Needs_No_Actuals is set appropriately in Fun. |
| |
| function Mode_Conformant (New_Id, Old_Id : Entity_Id) return Boolean; |
| -- Determine whether two callable entities (subprograms, entries, |
| -- literals) are mode conformant (RM 6.3.1(15)) |
| |
| procedure New_Overloaded_Entity |
| (S : Entity_Id; |
| Derived_Type : Entity_Id := Empty); |
| -- Process new overloaded entity. Overloaded entities are created by |
| -- enumeration type declarations, subprogram specifications, entry |
| -- declarations, and (implicitly) by type derivations. If Derived_Type |
| -- is non-empty then this is a subprogram derived for that type. |
| |
| procedure Process_Formals (T : List_Id; Related_Nod : Node_Id); |
| -- Enter the formals in the scope of the subprogram or entry, and |
| -- analyze default expressions if any. The implicit types created for |
| -- access parameter are attached to the Related_Nod which comes from the |
| -- context. |
| |
| procedure Reference_Body_Formals (Spec : Entity_Id; Bod : Entity_Id); |
| -- If there is a separate spec for a subprogram or generic subprogram, the |
| -- formals of the body are treated as references to the corresponding |
| -- formals of the spec. This reference does not count as an actual use of |
| -- the formal, in order to diagnose formals that are unused in the body. |
| -- This procedure is also used in renaming_as_body declarations, where |
| -- the formals of the specification must be treated as body formals that |
| -- correspond to the previous subprogram declaration, and not as new |
| -- entities with their defining entry in the cross-reference information. |
| |
| procedure Set_Actual_Subtypes (N : Node_Id; Subp : Entity_Id); |
| -- If the formals of a subprogram are unconstrained, build a subtype |
| -- declaration that uses the bounds or discriminants of the actual to |
| -- construct an actual subtype for them. This is an optimization that |
| -- is done only in some cases where the actual subtype cannot change |
| -- during execution of the subprogram. By setting the actual subtype |
| -- once, we avoid recomputing it unnecessarily. |
| |
| procedure Set_Formal_Mode (Formal_Id : Entity_Id); |
| -- Set proper Ekind to reflect formal mode (in, out, in out) |
| |
| function Subtype_Conformant |
| (New_Id : Entity_Id; |
| Old_Id : Entity_Id; |
| Skip_Controlling_Formals : Boolean := False) return Boolean; |
| -- Determine whether two callable entities (subprograms, entries, literals) |
| -- are subtype conformant (RM 6.3.1(16)). Skip_Controlling_Formals is True |
| -- when checking the conformance of a subprogram that implements an |
| -- interface operation. In that case, only the non-controlling formals |
| -- can (and must) be examined. |
| |
| function Type_Conformant |
| (New_Id : Entity_Id; |
| Old_Id : Entity_Id; |
| Skip_Controlling_Formals : Boolean := False) return Boolean; |
| -- Determine whether two callable entities (subprograms, entries, literals) |
| -- are type conformant (RM 6.3.1(14)). Skip_Controlling_Formals is True |
| -- when checking the conformance of a subprogram that implements an |
| -- interface operation. In that case, only the non-controlling formals |
| -- can (and must) be examined. |
| |
| procedure Valid_Operator_Definition (Designator : Entity_Id); |
| -- Verify that an operator definition has the proper number of formals |
| |
| end Sem_Ch6; |
