| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S E M _ E L A B -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- $Revision: 1.3 $ |
| -- -- |
| -- Copyright (C) 1997-2001 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 2, 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 COPYING. If not, write -- |
| -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- |
| -- MA 02111-1307, USA. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| with Atree; use Atree; |
| with Checks; use Checks; |
| with Debug; use Debug; |
| with Einfo; use Einfo; |
| with Elists; use Elists; |
| with Errout; use Errout; |
| with Exp_Util; use Exp_Util; |
| with Expander; use Expander; |
| with Fname; use Fname; |
| with Lib; use Lib; |
| with Lib.Load; use Lib.Load; |
| with Namet; use Namet; |
| with Nlists; use Nlists; |
| with Nmake; use Nmake; |
| with Opt; use Opt; |
| with Output; use Output; |
| with Restrict; use Restrict; |
| with Sem; use Sem; |
| with Sem_Cat; use Sem_Cat; |
| with Sem_Ch7; use Sem_Ch7; |
| with Sem_Ch8; use Sem_Ch8; |
| with Sem_Res; use Sem_Res; |
| with Sem_Util; use Sem_Util; |
| with Sinfo; use Sinfo; |
| with Sinput; use Sinput; |
| with Snames; use Snames; |
| with Stand; use Stand; |
| with Table; |
| with Tbuild; use Tbuild; |
| with Uname; use Uname; |
| |
| package body Sem_Elab is |
| |
| -- The following table records the recursive call chain for output |
| -- in the Output routine. Each entry records the call node and the |
| -- entity of the called routine. The number of entries in the table |
| -- (i.e. the value of Elab_Call.Last) indicates the current depth |
| -- of recursion and is used to identify the outer level. |
| |
| type Elab_Call_Entry is record |
| Cloc : Source_Ptr; |
| Ent : Entity_Id; |
| end record; |
| |
| package Elab_Call is new Table.Table ( |
| Table_Component_Type => Elab_Call_Entry, |
| Table_Index_Type => Int, |
| Table_Low_Bound => 1, |
| Table_Initial => 50, |
| Table_Increment => 100, |
| Table_Name => "Elab_Call"); |
| |
| -- This table is initialized at the start of each outer level call. |
| -- It holds the entities for all subprograms that have been examined |
| -- for this particular outer level call, and is used to prevent both |
| -- infinite recursion, and useless reanalysis of bodies already seen |
| |
| package Elab_Visited is new Table.Table ( |
| Table_Component_Type => Entity_Id, |
| Table_Index_Type => Int, |
| Table_Low_Bound => 1, |
| Table_Initial => 200, |
| Table_Increment => 100, |
| Table_Name => "Elab_Visited"); |
| |
| -- This table stores calls to Check_Internal_Call that are delayed |
| -- until all generics are instantiated, and in particular that all |
| -- generic bodies have been inserted. We need to delay, because we |
| -- need to be able to look through the inserted bodies. |
| |
| type Delay_Element is record |
| N : Node_Id; |
| -- The parameter N from the call to Check_Internal_Call. Note that |
| -- this node may get rewritten over the delay period by expansion |
| -- in the call case (but not in the instantiation case). |
| |
| E : Entity_Id; |
| -- The parameter E from the call to Check_Internal_Call |
| |
| Orig_Ent : Entity_Id; |
| -- The parameter Orig_Ent from the call to Check_Internal_Call |
| |
| Curscop : Entity_Id; |
| -- The current scope of the call. This is restored when we complete |
| -- the delayed call, so that we do this in the right scope. |
| |
| From_Elab_Code : Boolean; |
| -- Save indication of whether this call is from elaboration code |
| |
| Outer_Scope : Entity_Id; |
| -- Save scope of outer level call |
| |
| end record; |
| |
| package Delay_Check is new Table.Table ( |
| Table_Component_Type => Delay_Element, |
| Table_Index_Type => Int, |
| Table_Low_Bound => 1, |
| Table_Initial => 1000, |
| Table_Increment => 100, |
| Table_Name => "Delay_Check"); |
| |
| C_Scope : Entity_Id; |
| -- Top level scope of current scope. We need to compute this only |
| -- once at the outer level, i.e. for a call to Check_Elab_Call from |
| -- outside this unit. |
| |
| Outer_Level_Sloc : Source_Ptr; |
| -- Save Sloc value for outer level call node for comparisons of source |
| -- locations. A body is too late if it appears after the *outer* level |
| -- call, not the particular call that is being analyzed. |
| |
| From_Elab_Code : Boolean; |
| -- This flag shows whether the outer level call currently being examined |
| -- is or is not in elaboration code. We are only interested in calls to |
| -- routines in other units if this flag is True. |
| |
| In_Task_Activation : Boolean := False; |
| -- This flag indicates whether we are performing elaboration checks on |
| -- task procedures, at the point of activation. If true, we do not trace |
| -- internal calls in these procedures, because all local bodies are known |
| -- to be elaborated. |
| |
| Delaying_Elab_Checks : Boolean := True; |
| -- This is set True till the compilation is complete, including the |
| -- insertion of all instance bodies. Then when Check_Elab_Calls is |
| -- called, the delay table is used to make the delayed calls and |
| -- this flag is reset to False, so that the calls are processed |
| |
| ----------------------- |
| -- Local Subprograms -- |
| ----------------------- |
| |
| -- Note: Outer_Scope in all these calls represents the scope of |
| -- interest of the outer level call. If it is set to Standard_Standard, |
| -- then it means the outer level call was at elaboration level, and that |
| -- thus all calls are of interest. If it was set to some other scope, |
| -- then the original call was an inner call, and we are not interested |
| -- in calls that go outside this scope. |
| |
| procedure Check_A_Call |
| (N : Node_Id; |
| E : Entity_Id; |
| Outer_Scope : Entity_Id; |
| Inter_Unit_Only : Boolean; |
| Generate_Warnings : Boolean := True); |
| -- This is the internal recursive routine that is called to check for |
| -- a possible elaboration error. The argument N is a subprogram call |
| -- or generic instantiation to be checked, and E is the entity of |
| -- the called subprogram, or instantiated generic unit. The flag |
| -- Outer_Scope is the outer level scope for the original call. |
| -- Inter_Unit_Only is set if the call is only to be checked in the |
| -- case where it is to another unit (and skipped if within a unit). |
| -- Generate_Warnings is set to True to suppress warning messages |
| -- about missing pragma Elaborate_All's. These messages are not |
| -- wanted for inner calls in the dynamic model. |
| |
| procedure Check_Bad_Instantiation (N : Node_Id); |
| -- N is a node for an instantiation (if called with any other node kind, |
| -- Check_Bad_Instantiation ignores the call). This subprogram checks for |
| -- the special case of a generic instantiation of a generic spec in the |
| -- same declarative part as the instantiation where a body is present and |
| -- has not yet been seen. This is an obvious error, but needs to be checked |
| -- specially at the time of the instantiation, since it is a case where we |
| -- cannot insert the body anywhere. If this case is detected, warnings are |
| -- generated, and a raise of Program_Error is inserted. In addition any |
| -- subprograms in the generic spec are stubbed, and the Bad_Instantiation |
| -- flag is set on the instantiation node. The caller in Sem_Ch12 uses this |
| -- flag as an indication that no attempt should be made to insert an |
| -- instance body. |
| |
| procedure Check_Internal_Call |
| (N : Node_Id; |
| E : Entity_Id; |
| Outer_Scope : Entity_Id; |
| Orig_Ent : Entity_Id); |
| -- N is a function call or procedure statement call node and E is |
| -- the entity of the called function, which is within the current |
| -- compilation unit (where subunits count as part of the parent). |
| -- This call checks if this call, or any call within any accessed |
| -- body could cause an ABE, and if so, outputs a warning. Orig_Ent |
| -- differs from E only in the case of renamings, and points to the |
| -- original name of the entity. This is used for error messages. |
| -- Outer_Scope is the outer level scope for the original call. |
| |
| procedure Check_Internal_Call_Continue |
| (N : Node_Id; |
| E : Entity_Id; |
| Outer_Scope : Entity_Id; |
| Orig_Ent : Entity_Id); |
| -- The processing for Check_Internal_Call is divided up into two phases, |
| -- and this represents the second phase. The second phase is delayed if |
| -- Delaying_Elab_Calls is set to True. In this delayed case, the first |
| -- phase makes an entry in the Delay_Check table, which is processed |
| -- when Check_Elab_Calls is called. N, E and Orig_Ent are as for the call |
| -- to Check_Internal_Call. Outer_Scope is the outer level scope for |
| -- the original call. |
| |
| function Has_Generic_Body (N : Node_Id) return Boolean; |
| -- N is a generic package instantiation node, and this routine determines |
| -- if this package spec does in fact have a generic body. If so, then |
| -- True is returned, otherwise False. Note that this is not at all the |
| -- same as checking if the unit requires a body, since it deals with |
| -- the case of optional bodies accurately (i.e. if a body is optional, |
| -- then it looks to see if a body is actually present). Note: this |
| -- function can only do a fully correct job if in generating code mode |
| -- where all bodies have to be present. If we are operating in semantics |
| -- check only mode, then in some cases of optional bodies, a result of |
| -- False may incorrectly be given. In practice this simply means that |
| -- some cases of warnings for incorrect order of elaboration will only |
| -- be given when generating code, which is not a big problem (and is |
| -- inevitable, given the optional body semantics of Ada). |
| |
| procedure Insert_Elab_Check (N : Node_Id; C : Node_Id := Empty); |
| -- Given code for an elaboration check (or unconditional raise if |
| -- the check is not needed), inserts the code in the appropriate |
| -- place. N is the call or instantiation node for which the check |
| -- code is required. C is the test whose failure triggers the raise. |
| |
| procedure Output_Calls (N : Node_Id); |
| -- Outputs chain of calls stored in the Elab_Call table. The caller |
| -- has already generated the main warning message, so the warnings |
| -- generated are all continuation messages. The argument is the |
| -- call node at which the messages are to be placed. |
| |
| function Same_Elaboration_Scope (Scop1, Scop2 : Entity_Id) return Boolean; |
| -- Given two scopes, determine whether they are the same scope from an |
| -- elaboration point of view, i.e. packages and blocks are ignored. |
| |
| procedure Set_C_Scope; |
| -- On entry C_Scope is set to some scope. On return, C_Scope is reset |
| -- to be the enclosing compilation unit of this scope. |
| |
| function Spec_Entity (E : Entity_Id) return Entity_Id; |
| -- Given a compilation unit entity, if it is a spec entity, it is |
| -- returned unchanged. If it is a body entity, then the spec for |
| -- the corresponding spec is returned |
| |
| procedure Supply_Bodies (N : Node_Id); |
| -- Given a node, N, that is either a subprogram declaration or a package |
| -- declaration, this procedure supplies dummy bodies for the subprogram |
| -- or for all subprograms in the package. If the given node is not one |
| -- of these two possibilities, then Supply_Bodies does nothing. The |
| -- dummy body is supplied by setting the subprogram to be Imported with |
| -- convention Stubbed. |
| |
| procedure Supply_Bodies (L : List_Id); |
| -- Calls Supply_Bodies for all elements of the given list L. |
| |
| function Within (E1, E2 : Entity_Id) return Boolean; |
| -- Given two scopes E1 and E2, returns True if E1 is equal to E2, or |
| -- is one of its contained scopes, False otherwise. |
| |
| ------------------ |
| -- Check_A_Call -- |
| ------------------ |
| |
| procedure Check_A_Call |
| (N : Node_Id; |
| E : Entity_Id; |
| Outer_Scope : Entity_Id; |
| Inter_Unit_Only : Boolean; |
| Generate_Warnings : Boolean := True) |
| is |
| Loc : constant Source_Ptr := Sloc (N); |
| Ent : Entity_Id; |
| Decl : Node_Id; |
| |
| E_Scope : Entity_Id; |
| -- Top level scope of entity for called subprogram |
| |
| Body_Acts_As_Spec : Boolean; |
| -- Set to true if call is to body acting as spec (no separate spec) |
| |
| Inst_Case : constant Boolean := Nkind (N) in N_Generic_Instantiation; |
| -- Indicates if we have instantiation case |
| |
| Caller_Unit_Internal : Boolean; |
| Callee_Unit_Internal : Boolean; |
| |
| Inst_Caller : Source_Ptr; |
| Inst_Callee : Source_Ptr; |
| |
| Unit_Caller : Unit_Number_Type; |
| Unit_Callee : Unit_Number_Type; |
| |
| Cunit_SW : Boolean := False; |
| -- Set to suppress warnings for case of external reference where |
| -- one of the enclosing scopes has the Suppress_Elaboration_Warnings |
| -- flag set. For the internal case, we ignore this flag. |
| |
| Cunit_SC : Boolean := False; |
| -- Set to suppress dynamic elaboration checks where one of the |
| -- enclosing scopes has Suppress_Elaboration_Checks set. For |
| -- the internal case, we ignore this flag. |
| |
| begin |
| -- Go to parent for derived subprogram, or to original subprogram |
| -- in the case of a renaming (Alias covers both these cases) |
| |
| Ent := E; |
| loop |
| if Suppress_Elaboration_Warnings (Ent) then |
| return; |
| end if; |
| |
| -- Nothing to do for imported entities, |
| |
| if Is_Imported (Ent) then |
| return; |
| end if; |
| |
| exit when Inst_Case or else No (Alias (Ent)); |
| Ent := Alias (Ent); |
| end loop; |
| |
| Decl := Unit_Declaration_Node (Ent); |
| |
| if Nkind (Decl) = N_Subprogram_Body then |
| Body_Acts_As_Spec := True; |
| |
| elsif Nkind (Decl) = N_Subprogram_Declaration |
| or else Nkind (Decl) = N_Subprogram_Body_Stub |
| or else Inst_Case |
| then |
| Body_Acts_As_Spec := False; |
| |
| -- If we have none of an instantiation, subprogram body or |
| -- subprogram declaration, then it is not a case that we want |
| -- to check. (One case is a call to a generic formal subprogram, |
| -- where we do not want the check in the template). |
| |
| else |
| return; |
| end if; |
| |
| E_Scope := Ent; |
| loop |
| if Suppress_Elaboration_Warnings (E_Scope) then |
| Cunit_SW := True; |
| end if; |
| |
| if Suppress_Elaboration_Checks (E_Scope) then |
| Cunit_SC := True; |
| end if; |
| |
| -- Exit when we get to compilation unit, not counting subunits |
| |
| exit when Is_Compilation_Unit (E_Scope) |
| and then (Is_Child_Unit (E_Scope) |
| or else Scope (E_Scope) = Standard_Standard); |
| |
| -- If we did not find a compilation unit, other than standard, |
| -- then nothing to check (happens in some instantiation cases) |
| |
| if E_Scope = Standard_Standard then |
| return; |
| |
| -- Otherwise move up a scope looking for compilation unit |
| |
| else |
| E_Scope := Scope (E_Scope); |
| end if; |
| end loop; |
| |
| -- No checks needed for pure or preelaborated compilation units |
| |
| if Is_Pure (E_Scope) |
| or else Is_Preelaborated (E_Scope) |
| then |
| return; |
| end if; |
| |
| -- If the generic entity is within a deeper instance than we are, then |
| -- either the instantiation to which we refer itself caused an ABE, in |
| -- which case that will be handled separately. Otherwise, we know that |
| -- the body we need appears as needed at the point of the instantiation. |
| -- However, this assumption is only valid if we are in static mode. |
| |
| if not Dynamic_Elaboration_Checks |
| and then Instantiation_Depth (Sloc (Ent)) > |
| Instantiation_Depth (Sloc (N)) |
| then |
| return; |
| end if; |
| |
| -- Do not give a warning for a package with no body |
| |
| if Ekind (Ent) = E_Generic_Package |
| and then not Has_Generic_Body (N) |
| then |
| return; |
| end if; |
| |
| -- Case of entity is not in current unit (i.e. with'ed unit case) |
| |
| if E_Scope /= C_Scope then |
| |
| -- We are only interested in such calls if the outer call was from |
| -- elaboration code, or if we are in Dynamic_Elaboration_Checks mode. |
| |
| if not From_Elab_Code and then not Dynamic_Elaboration_Checks then |
| return; |
| end if; |
| |
| -- Nothing to do if some scope said to ignore warnings |
| |
| if Cunit_SW then |
| return; |
| end if; |
| |
| -- Nothing to do for a generic instance, because in this case |
| -- the checking was at the point of instantiation of the generic |
| -- However, this shortcut is only applicable in static mode. |
| |
| if Is_Generic_Instance (Ent) and not Dynamic_Elaboration_Checks then |
| return; |
| end if; |
| |
| -- Nothing to do if subprogram with no separate spec |
| |
| if Body_Acts_As_Spec then |
| return; |
| end if; |
| |
| -- Check cases of internal units |
| |
| Callee_Unit_Internal := |
| Is_Internal_File_Name |
| (Unit_File_Name (Get_Source_Unit (E_Scope))); |
| |
| -- Do not give a warning if the with'ed unit is internal |
| -- and this is the generic instantiation case (this saves a |
| -- lot of hassle dealing with the Text_IO special child units) |
| |
| if Callee_Unit_Internal and Inst_Case then |
| return; |
| end if; |
| |
| if C_Scope = Standard_Standard then |
| Caller_Unit_Internal := False; |
| else |
| Caller_Unit_Internal := |
| Is_Internal_File_Name |
| (Unit_File_Name (Get_Source_Unit (C_Scope))); |
| end if; |
| |
| -- Do not give a warning if the with'ed unit is internal |
| -- and the caller is not internal (since the binder always |
| -- elaborates internal units first). |
| |
| if Callee_Unit_Internal and (not Caller_Unit_Internal) then |
| return; |
| end if; |
| |
| -- For now, if debug flag -gnatdE is not set, do no checking for |
| -- one internal unit withing another. This fixes the problem with |
| -- the sgi build and storage errors. To be resolved later ??? |
| |
| if (Callee_Unit_Internal and Caller_Unit_Internal) |
| and then not Debug_Flag_EE |
| then |
| return; |
| end if; |
| |
| Ent := E; |
| |
| -- If the call is in an instance, and the called entity is not |
| -- defined in the same instance, then the elaboration issue |
| -- focuses around the unit containing the template, it is |
| -- this unit which requires an Elaborate_All. |
| |
| -- However, if we are doing dynamic elaboration, we need to |
| -- chase the call in the usual manner. |
| |
| -- We do not handle the case of calling a generic formal correctly |
| -- in the static case. See test 4703-004 to explore this gap ??? |
| |
| Inst_Caller := Instantiation (Get_Source_File_Index (Sloc (N))); |
| Inst_Callee := Instantiation (Get_Source_File_Index (Sloc (Ent))); |
| |
| if Inst_Caller = No_Location then |
| Unit_Caller := No_Unit; |
| else |
| Unit_Caller := Get_Source_Unit (N); |
| end if; |
| |
| if Inst_Callee = No_Location then |
| Unit_Callee := No_Unit; |
| else |
| Unit_Callee := Get_Source_Unit (Ent); |
| end if; |
| |
| if Unit_Caller /= No_Unit |
| and then Unit_Callee /= Unit_Caller |
| and then Unit_Callee /= No_Unit |
| and then not Dynamic_Elaboration_Checks |
| then |
| E_Scope := Spec_Entity (Cunit_Entity (Unit_Caller)); |
| |
| -- If we don't get a spec entity, just ignore call. Not |
| -- quite clear why this check is necessary. |
| |
| if No (E_Scope) then |
| return; |
| end if; |
| |
| -- Otherwise step to enclosing compilation unit |
| |
| while not Is_Compilation_Unit (E_Scope) loop |
| E_Scope := Scope (E_Scope); |
| end loop; |
| |
| -- For the case of not in an instance, or call within instance |
| -- We recompute E_Scope for the error message, since we |
| -- do NOT want to go to the unit which has the ultimate |
| -- declaration in the case of renaming and derivation and |
| -- we also want to go to the generic unit in the case of |
| -- an instance, and no further. |
| |
| else |
| -- Loop to carefully follow renamings and derivations |
| -- one step outside the current unit, but not further. |
| |
| if not Inst_Case |
| and then Present (Alias (Ent)) |
| then |
| E_Scope := Alias (Ent); |
| else |
| E_Scope := Ent; |
| end if; |
| |
| loop |
| while not Is_Compilation_Unit (E_Scope) loop |
| E_Scope := Scope (E_Scope); |
| end loop; |
| |
| -- If E_Scope is the same as C_Scope, it means that there |
| -- definitely was a local renaming or derivation, and we |
| -- are not yet out of the current unit. |
| |
| exit when E_Scope /= C_Scope; |
| Ent := Alias (Ent); |
| E_Scope := Ent; |
| end loop; |
| end if; |
| |
| if not Suppress_Elaboration_Warnings (Ent) |
| and then not Suppress_Elaboration_Warnings (E_Scope) |
| and then Elab_Warnings |
| and then Generate_Warnings |
| then |
| Warn_On_Instance := True; |
| |
| if Inst_Case then |
| Error_Msg_NE |
| ("instantiation of& may raise Program_Error?", N, Ent); |
| else |
| Error_Msg_NE |
| ("call to & may raise Program_Error?", N, Ent); |
| end if; |
| |
| Error_Msg_Qual_Level := Nat'Last; |
| Error_Msg_NE |
| ("\missing pragma Elaborate_All for&?", N, E_Scope); |
| Error_Msg_Qual_Level := 0; |
| Output_Calls (N); |
| Warn_On_Instance := False; |
| |
| -- Set flag to prevent further warnings for same unit |
| -- unless in All_Errors_Mode. |
| |
| if not All_Errors_Mode and not Dynamic_Elaboration_Checks then |
| Set_Suppress_Elaboration_Warnings (E_Scope); |
| end if; |
| end if; |
| |
| -- Check for runtime elaboration check required |
| |
| if Dynamic_Elaboration_Checks then |
| if not Elaboration_Checks_Suppressed (Ent) |
| and then not Suppress_Elaboration_Checks (E_Scope) |
| and then not Cunit_SC |
| then |
| -- Runtime elaboration check required. generate check of the |
| -- elaboration Boolean for the unit containing the entity. |
| |
| Insert_Elab_Check (N, |
| Make_Attribute_Reference (Loc, |
| Attribute_Name => Name_Elaborated, |
| Prefix => |
| New_Occurrence_Of |
| (Spec_Entity (E_Scope), Loc))); |
| end if; |
| |
| -- If no dynamic check required, then ask binder to guarantee |
| -- that the necessary elaborations will be done properly! |
| |
| else |
| if not Suppress_Elaboration_Warnings (E) |
| and then not Suppress_Elaboration_Warnings (E_Scope) |
| and then Elab_Warnings |
| and then Generate_Warnings |
| and then not Inst_Case |
| then |
| Error_Msg_Node_2 := E_Scope; |
| Error_Msg_NE ("call to& in elaboration code " & |
| "requires pragma Elaborate_All on&?", N, E); |
| end if; |
| |
| Set_Elaborate_All_Desirable (E_Scope); |
| Set_Suppress_Elaboration_Warnings (E_Scope); |
| end if; |
| |
| -- Case of entity is in same unit as call or instantiation |
| |
| elsif not Inter_Unit_Only then |
| Check_Internal_Call (N, Ent, Outer_Scope, E); |
| end if; |
| |
| end Check_A_Call; |
| |
| ----------------------------- |
| -- Check_Bad_Instantiation -- |
| ----------------------------- |
| |
| procedure Check_Bad_Instantiation (N : Node_Id) is |
| Nam : Node_Id; |
| Ent : Entity_Id; |
| |
| begin |
| -- Nothing to do if we do not have an instantiation (happens in some |
| -- error cases, and also in the formal package declaration case) |
| |
| if Nkind (N) not in N_Generic_Instantiation then |
| return; |
| |
| -- Nothing to do if errors already detected (avoid cascaded errors) |
| |
| elsif Errors_Detected /= 0 then |
| return; |
| |
| -- Nothing to do if not in full analysis mode |
| |
| elsif not Full_Analysis then |
| return; |
| |
| -- Nothing to do if inside a generic template |
| |
| elsif Inside_A_Generic then |
| return; |
| |
| -- Nothing to do if a library level instantiation |
| |
| elsif Nkind (Parent (N)) = N_Compilation_Unit then |
| return; |
| |
| -- Nothing to do if we are compiling a proper body for semantic |
| -- purposes only. The generic body may be in another proper body. |
| |
| elsif |
| Nkind (Parent (Unit_Declaration_Node (Main_Unit_Entity))) = N_Subunit |
| then |
| return; |
| end if; |
| |
| Nam := Name (N); |
| Ent := Entity (Nam); |
| |
| -- The case we are interested in is when the generic spec is in the |
| -- current declarative part |
| |
| if not Same_Elaboration_Scope (Current_Scope, Scope (Ent)) |
| or else not In_Same_Extended_Unit (Sloc (N), Sloc (Ent)) |
| then |
| return; |
| end if; |
| |
| -- If the generic entity is within a deeper instance than we are, then |
| -- either the instantiation to which we refer itself caused an ABE, in |
| -- which case that will be handled separately. Otherwise, we know that |
| -- the body we need appears as needed at the point of the instantiation. |
| -- If they are both at the same level but not within the same instance |
| -- then the body of the generic will be in the earlier instance. |
| |
| declare |
| D1 : constant Int := Instantiation_Depth (Sloc (Ent)); |
| D2 : constant Int := Instantiation_Depth (Sloc (N)); |
| |
| begin |
| if D1 > D2 then |
| return; |
| |
| elsif D1 = D2 |
| and then Is_Generic_Instance (Scope (Ent)) |
| and then not In_Open_Scopes (Scope (Ent)) |
| then |
| return; |
| end if; |
| end; |
| |
| -- Now we can proceed, if the entity being called has a completion, |
| -- then we are definitely OK, since we have already seen the body. |
| |
| if Has_Completion (Ent) then |
| return; |
| end if; |
| |
| -- If there is no body, then nothing to do |
| |
| if not Has_Generic_Body (N) then |
| return; |
| end if; |
| |
| -- Here we definitely have a bad instantiation |
| |
| Error_Msg_NE |
| ("?cannot instantiate& before body seen", N, Ent); |
| |
| if Present (Instance_Spec (N)) then |
| Supply_Bodies (Instance_Spec (N)); |
| end if; |
| |
| Error_Msg_N |
| ("\?Program_Error will be raised at run time", N); |
| Insert_Elab_Check (N); |
| Set_ABE_Is_Certain (N); |
| |
| end Check_Bad_Instantiation; |
| |
| --------------------- |
| -- Check_Elab_Call -- |
| --------------------- |
| |
| procedure Check_Elab_Call |
| (N : Node_Id; |
| Outer_Scope : Entity_Id := Empty) |
| is |
| Nam : Node_Id; |
| Ent : Entity_Id; |
| P : Node_Id; |
| |
| begin |
| -- For an entry call, check relevant restriction |
| |
| if Nkind (N) = N_Entry_Call_Statement |
| and then not In_Subprogram_Or_Concurrent_Unit |
| then |
| Check_Restriction (No_Entry_Calls_In_Elaboration_Code, N); |
| |
| -- Nothing to do if this is not a call (happens in some error |
| -- conditions, and in some cases where rewriting occurs). |
| |
| elsif Nkind (N) /= N_Function_Call |
| and then Nkind (N) /= N_Procedure_Call_Statement |
| then |
| return; |
| |
| -- Nothing to do if this is a call already rewritten for elab checking. |
| |
| elsif Nkind (Parent (N)) = N_Conditional_Expression then |
| return; |
| |
| -- Nothing to do if inside a generic template |
| |
| elsif Inside_A_Generic |
| and then not Present (Enclosing_Generic_Body (N)) |
| then |
| return; |
| end if; |
| |
| -- Here we have a call at elaboration time which must be checked |
| |
| if Debug_Flag_LL then |
| Write_Str (" Check_Elab_Call: "); |
| |
| if No (Name (N)) |
| or else not Is_Entity_Name (Name (N)) |
| then |
| Write_Str ("<<not entity name>> "); |
| else |
| Write_Name (Chars (Entity (Name (N)))); |
| end if; |
| |
| Write_Str (" call at "); |
| Write_Location (Sloc (N)); |
| Write_Eol; |
| end if; |
| |
| -- Climb up the tree to make sure we are not inside a |
| -- default expression of a parameter specification or |
| -- a record component, since in both these cases, we |
| -- will be doing the actual call later, not now, and it |
| -- is at the time of the actual call (statically speaking) |
| -- that we must do our static check, not at the time of |
| -- its initial analysis). |
| |
| P := Parent (N); |
| while Present (P) loop |
| if Nkind (P) = N_Parameter_Specification |
| or else |
| Nkind (P) = N_Component_Declaration |
| then |
| return; |
| else |
| P := Parent (P); |
| end if; |
| end loop; |
| |
| -- Stuff that happens only at the outer level |
| |
| if No (Outer_Scope) then |
| Elab_Visited.Set_Last (0); |
| |
| -- Nothing to do if current scope is Standard (this is a bit |
| -- odd, but it happens in the case of generic instantiations). |
| |
| C_Scope := Current_Scope; |
| |
| if C_Scope = Standard_Standard then |
| return; |
| end if; |
| |
| -- First case, we are in elaboration code |
| |
| From_Elab_Code := not In_Subprogram_Or_Concurrent_Unit; |
| |
| if From_Elab_Code then |
| |
| -- Complain if call that comes from source in preelaborated |
| -- unit and we are not inside a subprogram (i.e. we are in |
| -- elab code) |
| |
| if Comes_From_Source (N) |
| and then In_Preelaborated_Unit |
| then |
| Error_Msg_N |
| ("non-static call not allowed in preelaborated unit", N); |
| return; |
| end if; |
| |
| -- Second case, we are inside a subprogram or concurrent unit |
| -- i.e, we are not in elaboration code. |
| |
| else |
| -- In this case, the issue is whether we are inside the |
| -- declarative part of the unit in which we live, or inside |
| -- its statements. In the latter case, there is no issue of |
| -- ABE calls at this level (a call from outside to the unit |
| -- in which we live might cause an ABE, but that will be |
| -- detected when we analyze that outer level call, as it |
| -- recurses into the called unit). |
| |
| -- Climb up the tree, doing this test, and also testing |
| -- for being inside a default expression, which, as |
| -- discussed above, is not checked at this stage. |
| |
| declare |
| P : Node_Id; |
| L : List_Id; |
| |
| begin |
| P := N; |
| loop |
| -- If we find a parentless subtree, it seems safe to |
| -- assume that we are not in a declarative part and |
| -- that no checking is required. |
| |
| if No (P) then |
| return; |
| end if; |
| |
| if Is_List_Member (P) then |
| L := List_Containing (P); |
| P := Parent (L); |
| else |
| L := No_List; |
| P := Parent (P); |
| end if; |
| |
| exit when Nkind (P) = N_Subunit; |
| |
| -- Filter out case of default expressions, where |
| -- we do not do the check at this stage. |
| |
| if Nkind (P) = N_Parameter_Specification |
| or else |
| Nkind (P) = N_Component_Declaration |
| then |
| return; |
| end if; |
| |
| if Nkind (P) = N_Subprogram_Body |
| or else |
| Nkind (P) = N_Protected_Body |
| or else |
| Nkind (P) = N_Task_Body |
| or else |
| Nkind (P) = N_Block_Statement |
| then |
| if L = Declarations (P) then |
| exit; |
| |
| -- We are not in elaboration code, but we are doing |
| -- dynamic elaboration checks, in this case, we still |
| -- need to do the call, since the subprogram we are in |
| -- could be called from another unit, also in dynamic |
| -- elaboration check mode, at elaboration time. |
| |
| elsif Dynamic_Elaboration_Checks then |
| |
| -- This is a rather new check, going into version |
| -- 3.14a1 for the first time (V1.80 of this unit), |
| -- so we provide a debug flag to enable it. That |
| -- way we have an easy work around for regressions |
| -- that are caused by this new check. This debug |
| -- flag can be removed later. |
| |
| if Debug_Flag_DD then |
| return; |
| end if; |
| |
| -- Do the check in this case |
| |
| exit; |
| |
| -- Static model, call is not in elaboration code, we |
| -- never need to worry, because in the static model |
| -- the top level caller always takes care of things. |
| |
| else |
| return; |
| end if; |
| end if; |
| end loop; |
| end; |
| end if; |
| end if; |
| |
| -- Retrieve called entity. If this is a call to a protected subprogram, |
| -- the entity is a selected component. |
| -- The callable entity may be absent, in which case there is nothing |
| -- to do. This happens with non-analyzed calls in nested generics. |
| |
| Nam := Name (N); |
| |
| if No (Nam) then |
| return; |
| |
| elsif Nkind (Nam) = N_Selected_Component then |
| Ent := Entity (Selector_Name (Nam)); |
| |
| elsif not Is_Entity_Name (Nam) then |
| return; |
| |
| else |
| Ent := Entity (Nam); |
| end if; |
| |
| if No (Ent) then |
| return; |
| end if; |
| |
| -- Nothing to do if this is a recursive call (i.e. a call to |
| -- an entity that is already in the Elab_Call stack) |
| |
| for J in 1 .. Elab_Visited.Last loop |
| if Ent = Elab_Visited.Table (J) then |
| return; |
| end if; |
| end loop; |
| |
| -- See if we need to analyze this call. We analyze it if either of |
| -- the following conditions is met: |
| |
| -- It is an inner level call (since in this case it was triggered |
| -- by an outer level call from elaboration code), but only if the |
| -- call is within the scope of the original outer level call. |
| |
| -- It is an outer level call from elaboration code, or the called |
| -- entity is in the same elaboration scope. |
| |
| -- And in these cases, we will check both inter-unit calls and |
| -- intra-unit (within a single unit) calls. |
| |
| C_Scope := Current_Scope; |
| |
| -- If not outer level call, then we follow it if it is within |
| -- the original scope of the outer call. |
| |
| if Present (Outer_Scope) |
| and then Within (Scope (Ent), Outer_Scope) |
| then |
| Set_C_Scope; |
| Check_A_Call (N, Ent, Outer_Scope, Inter_Unit_Only => False); |
| |
| elsif Elaboration_Checks_Suppressed (Current_Scope) then |
| null; |
| |
| elsif From_Elab_Code then |
| Set_C_Scope; |
| Check_A_Call (N, Ent, Standard_Standard, Inter_Unit_Only => False); |
| |
| elsif Same_Elaboration_Scope (C_Scope, Scope (Ent)) then |
| Set_C_Scope; |
| Check_A_Call (N, Ent, Scope (Ent), Inter_Unit_Only => False); |
| |
| -- If none of those cases holds, but Dynamic_Elaboration_Checks mode |
| -- is set, then we will do the check, but only in the inter-unit case |
| -- (this is to accommodate unguarded elaboration calls from other units |
| -- in which this same mode is set). We don't want warnings in this case, |
| -- it would generate warnings having nothing to do with elaboration. |
| |
| elsif Dynamic_Elaboration_Checks then |
| Set_C_Scope; |
| Check_A_Call |
| (N, |
| Ent, |
| Standard_Standard, |
| Inter_Unit_Only => True, |
| Generate_Warnings => False); |
| |
| else |
| return; |
| end if; |
| end Check_Elab_Call; |
| |
| ---------------------- |
| -- Check_Elab_Calls -- |
| ---------------------- |
| |
| procedure Check_Elab_Calls is |
| begin |
| -- If expansion is disabled, do not generate any checks. Also |
| -- skip checks if any subunits are missing because in either |
| -- case we lack the full information that we need, and no object |
| -- file will be created in any case. |
| |
| if not Expander_Active or else Subunits_Missing then |
| return; |
| end if; |
| |
| -- Skip delayed calls if we had any errors |
| |
| if Errors_Detected = 0 then |
| Delaying_Elab_Checks := False; |
| Expander_Mode_Save_And_Set (True); |
| |
| for J in Delay_Check.First .. Delay_Check.Last loop |
| New_Scope (Delay_Check.Table (J).Curscop); |
| From_Elab_Code := Delay_Check.Table (J).From_Elab_Code; |
| |
| Check_Internal_Call_Continue ( |
| N => Delay_Check.Table (J).N, |
| E => Delay_Check.Table (J).E, |
| Outer_Scope => Delay_Check.Table (J).Outer_Scope, |
| Orig_Ent => Delay_Check.Table (J).Orig_Ent); |
| |
| Pop_Scope; |
| end loop; |
| |
| -- Set Delaying_Elab_Checks back on for next main compilation |
| |
| Expander_Mode_Restore; |
| Delaying_Elab_Checks := True; |
| end if; |
| end Check_Elab_Calls; |
| |
| ------------------------------ |
| -- Check_Elab_Instantiation -- |
| ------------------------------ |
| |
| procedure Check_Elab_Instantiation |
| (N : Node_Id; |
| Outer_Scope : Entity_Id := Empty) |
| is |
| Nam : Node_Id; |
| Ent : Entity_Id; |
| |
| begin |
| -- Check for and deal with bad instantiation case. There is some |
| -- duplicated code here, but we will worry about this later ??? |
| |
| Check_Bad_Instantiation (N); |
| |
| if ABE_Is_Certain (N) then |
| return; |
| end if; |
| |
| -- Nothing to do if we do not have an instantiation (happens in some |
| -- error cases, and also in the formal package declaration case) |
| |
| if Nkind (N) not in N_Generic_Instantiation then |
| return; |
| end if; |
| |
| -- Nothing to do if inside a generic template |
| |
| if Inside_A_Generic then |
| return; |
| end if; |
| |
| Nam := Name (N); |
| Ent := Entity (Nam); |
| From_Elab_Code := not In_Subprogram_Or_Concurrent_Unit; |
| |
| -- See if we need to analyze this instantiation. We analyze it if |
| -- either of the following conditions is met: |
| |
| -- It is an inner level instantiation (since in this case it was |
| -- triggered by an outer level call from elaboration code), but |
| -- only if the instantiation is within the scope of the original |
| -- outer level call. |
| |
| -- It is an outer level instantiation from elaboration code, or the |
| -- instantiated entity is in the same elaboratoin scope. |
| |
| -- And in these cases, we will check both the inter-unit case and |
| -- the intra-unit (within a single unit) case. |
| |
| C_Scope := Current_Scope; |
| |
| if Present (Outer_Scope) |
| and then Within (Scope (Ent), Outer_Scope) |
| then |
| Set_C_Scope; |
| Check_A_Call (N, Ent, Outer_Scope, Inter_Unit_Only => False); |
| |
| elsif From_Elab_Code then |
| Set_C_Scope; |
| Check_A_Call (N, Ent, Standard_Standard, Inter_Unit_Only => False); |
| |
| elsif Same_Elaboration_Scope (C_Scope, Scope (Ent)) then |
| Set_C_Scope; |
| Check_A_Call (N, Ent, Scope (Ent), Inter_Unit_Only => False); |
| |
| -- If none of those cases holds, but Dynamic_Elaboration_Checks mode |
| -- is set, then we will do the check, but only in the inter-unit case |
| -- (this is to accommodate unguarded elaboration calls from other units |
| -- in which this same mode is set). We inhibit warnings in this case, |
| -- since this instantiation is not occurring in elaboration code. |
| |
| elsif Dynamic_Elaboration_Checks then |
| Set_C_Scope; |
| Check_A_Call |
| (N, |
| Ent, |
| Standard_Standard, |
| Inter_Unit_Only => True, |
| Generate_Warnings => False); |
| |
| else |
| return; |
| end if; |
| end Check_Elab_Instantiation; |
| |
| ------------------------- |
| -- Check_Internal_Call -- |
| ------------------------- |
| |
| procedure Check_Internal_Call |
| (N : Node_Id; |
| E : Entity_Id; |
| Outer_Scope : Entity_Id; |
| Orig_Ent : Entity_Id) |
| is |
| Inst_Case : constant Boolean := Nkind (N) in N_Generic_Instantiation; |
| |
| begin |
| -- If not function or procedure call or instantiation, then ignore |
| -- call (this happens in some error case and rewriting cases) |
| |
| if Nkind (N) /= N_Function_Call |
| and then |
| Nkind (N) /= N_Procedure_Call_Statement |
| and then |
| not Inst_Case |
| then |
| return; |
| |
| -- Nothing to do if this is a call or instantiation that has |
| -- already been found to be a sure ABE |
| |
| elsif ABE_Is_Certain (N) then |
| return; |
| |
| -- Nothing to do if errors already detected (avoid cascaded errors) |
| |
| elsif Errors_Detected /= 0 then |
| return; |
| |
| -- Nothing to do if not in full analysis mode |
| |
| elsif not Full_Analysis then |
| return; |
| |
| -- Nothing to do if within a default expression, since the call |
| -- is not actualy being made at this time. |
| |
| elsif In_Default_Expression then |
| return; |
| |
| -- Nothing to do for call to intrinsic subprogram |
| |
| elsif Is_Intrinsic_Subprogram (E) then |
| return; |
| |
| -- No need to trace local calls if checking task activation, because |
| -- other local bodies are elaborated already. |
| |
| elsif In_Task_Activation then |
| return; |
| end if; |
| |
| -- Delay this call if we are still delaying calls |
| |
| if Delaying_Elab_Checks then |
| Delay_Check.Increment_Last; |
| Delay_Check.Table (Delay_Check.Last) := |
| (N => N, |
| E => E, |
| Orig_Ent => Orig_Ent, |
| Curscop => Current_Scope, |
| Outer_Scope => Outer_Scope, |
| From_Elab_Code => From_Elab_Code); |
| return; |
| |
| -- Otherwise, call phase 2 continuation right now |
| |
| else |
| Check_Internal_Call_Continue (N, E, Outer_Scope, Orig_Ent); |
| end if; |
| |
| end Check_Internal_Call; |
| |
| ---------------------------------- |
| -- Check_Internal_Call_Continue -- |
| ---------------------------------- |
| |
| procedure Check_Internal_Call_Continue |
| (N : Node_Id; |
| E : Entity_Id; |
| Outer_Scope : Entity_Id; |
| Orig_Ent : Entity_Id) |
| is |
| Loc : constant Source_Ptr := Sloc (N); |
| Inst_Case : constant Boolean := Is_Generic_Unit (E); |
| |
| Sbody : Node_Id; |
| Ebody : Entity_Id; |
| |
| function Process (N : Node_Id) return Traverse_Result; |
| -- Function applied to each node as we traverse the body. |
| -- Checks for call that needs checking, and if so checks |
| -- it. Always returns OK, so entire tree is traversed. |
| |
| function Process (N : Node_Id) return Traverse_Result is |
| begin |
| -- If user has specified that there are no entry calls in elaboration |
| -- code, do not trace past an accept statement, because the rendez- |
| -- vous will happen after elaboration. |
| |
| if (Nkind (Original_Node (N)) = N_Accept_Statement |
| or else Nkind (Original_Node (N)) = N_Selective_Accept) |
| and then Restrictions (No_Entry_Calls_In_Elaboration_Code) |
| then |
| return Abandon; |
| |
| -- If we have a subprogram call, check it |
| |
| elsif Nkind (N) = N_Function_Call |
| or else Nkind (N) = N_Procedure_Call_Statement |
| then |
| Check_Elab_Call (N, Outer_Scope); |
| return OK; |
| |
| -- If we have a generic instantiation, check it |
| |
| elsif Nkind (N) in N_Generic_Instantiation then |
| Check_Elab_Instantiation (N, Outer_Scope); |
| return OK; |
| |
| -- Skip subprogram bodies that come from source (wait for |
| -- call to analyze these). The reason for the come from |
| -- source test is to avoid catching task bodies. |
| |
| -- For task bodies, we should really avoid these too, waiting |
| -- for the task activation, but that's too much trouble to |
| -- catch for now, so we go in unconditionally. This is not |
| -- so terrible, it means the error backtrace is not quite |
| -- complete, and we are too eager to scan bodies of tasks |
| -- that are unused, but this is hardly very significant! |
| |
| elsif Nkind (N) = N_Subprogram_Body |
| and then Comes_From_Source (N) |
| then |
| return Skip; |
| |
| else |
| return OK; |
| end if; |
| end Process; |
| |
| procedure Traverse is new Atree.Traverse_Proc; |
| -- Traverse procedure using above Process function |
| |
| -- Start of processing for Check_Internal_Call_Continue |
| |
| begin |
| -- Save outer level call if at outer level |
| |
| if Elab_Call.Last = 0 then |
| Outer_Level_Sloc := Loc; |
| end if; |
| |
| Elab_Visited.Increment_Last; |
| Elab_Visited.Table (Elab_Visited.Last) := E; |
| |
| -- If the call is to a function that renames a literal, no check |
| -- is needed. |
| |
| if Ekind (E) = E_Enumeration_Literal then |
| return; |
| end if; |
| |
| Sbody := Unit_Declaration_Node (E); |
| |
| if Nkind (Sbody) /= N_Subprogram_Body |
| and then |
| Nkind (Sbody) /= N_Package_Body |
| then |
| Ebody := Corresponding_Body (Sbody); |
| |
| if No (Ebody) then |
| return; |
| else |
| Sbody := Unit_Declaration_Node (Ebody); |
| end if; |
| end if; |
| |
| -- If the body appears after the outer level call or |
| -- instantiation then we have an error case handled below. |
| |
| if Earlier_In_Extended_Unit (Outer_Level_Sloc, Sloc (Sbody)) |
| and then not In_Task_Activation |
| then |
| null; |
| |
| -- If we have the instantiation case we are done, since we now |
| -- know that the body of the generic appeared earlier. |
| |
| elsif Inst_Case then |
| return; |
| |
| -- Otherwise we have a call, so we trace through the called |
| -- body to see if it has any problems .. |
| |
| else |
| pragma Assert (Nkind (Sbody) = N_Subprogram_Body); |
| |
| Elab_Call.Increment_Last; |
| Elab_Call.Table (Elab_Call.Last).Cloc := Loc; |
| Elab_Call.Table (Elab_Call.Last).Ent := E; |
| |
| if Debug_Flag_LL then |
| Write_Str ("Elab_Call.Last = "); |
| Write_Int (Int (Elab_Call.Last)); |
| Write_Str (" Ent = "); |
| Write_Name (Chars (E)); |
| Write_Str (" at "); |
| Write_Location (Sloc (N)); |
| Write_Eol; |
| end if; |
| |
| -- Now traverse declarations and statements of subprogram body. |
| -- Note that we cannot simply Traverse (Sbody), since traverse |
| -- does not normally visit subprogram bodies. |
| |
| declare |
| Decl : Node_Id := First (Declarations (Sbody)); |
| |
| begin |
| while Present (Decl) loop |
| Traverse (Decl); |
| Next (Decl); |
| end loop; |
| end; |
| |
| Traverse (Handled_Statement_Sequence (Sbody)); |
| |
| Elab_Call.Decrement_Last; |
| return; |
| end if; |
| |
| -- Here is the case of calling a subprogram where the body has |
| -- not yet been encountered, a warning message is needed. |
| |
| Warn_On_Instance := True; |
| |
| -- If we have nothing in the call stack, then this is at the |
| -- outer level, and the ABE is bound to occur. |
| |
| if Elab_Call.Last = 0 then |
| |
| if Inst_Case then |
| Error_Msg_NE |
| ("?cannot instantiate& before body seen", N, Orig_Ent); |
| else |
| Error_Msg_NE |
| ("?cannot call& before body seen", N, Orig_Ent); |
| end if; |
| |
| Error_Msg_N |
| ("\?Program_Error will be raised at run time", N); |
| Insert_Elab_Check (N); |
| |
| -- Call is not at outer level |
| |
| else |
| -- Deal with dynamic elaboration check |
| |
| if not Elaboration_Checks_Suppressed (E) then |
| Set_Elaboration_Entity_Required (E); |
| |
| -- Case of no elaboration entity allocated yet |
| |
| if No (Elaboration_Entity (E)) then |
| |
| -- Create object declaration for elaboration entity, and put it |
| -- just in front of the spec of the subprogram or generic unit, |
| -- in the same scope as this unit. |
| |
| declare |
| Loce : constant Source_Ptr := Sloc (E); |
| Ent : constant Entity_Id := |
| Make_Defining_Identifier (Loc, |
| Chars => New_External_Name (Chars (E), 'E')); |
| |
| begin |
| Set_Elaboration_Entity (E, Ent); |
| New_Scope (Scope (E)); |
| |
| Insert_Action (Declaration_Node (E), |
| Make_Object_Declaration (Loce, |
| Defining_Identifier => Ent, |
| Object_Definition => |
| New_Occurrence_Of (Standard_Boolean, Loce), |
| Expression => New_Occurrence_Of (Standard_False, Loce))); |
| |
| -- Set elaboration flag at the point of the body |
| |
| Set_Elaboration_Flag (Sbody, E); |
| |
| Pop_Scope; |
| end; |
| end if; |
| |
| -- Generate check of the elaboration Boolean |
| |
| Insert_Elab_Check (N, |
| New_Occurrence_Of (Elaboration_Entity (E), Loc)); |
| end if; |
| |
| -- Generate the warning |
| |
| if not Suppress_Elaboration_Warnings (E) then |
| if Inst_Case then |
| Error_Msg_NE |
| ("instantiation of& may occur before body is seen?", |
| N, Orig_Ent); |
| else |
| Error_Msg_NE |
| ("call to& may occur before body is seen?", N, Orig_Ent); |
| end if; |
| |
| Error_Msg_N |
| ("\Program_Error may be raised at run time?", N); |
| |
| Output_Calls (N); |
| end if; |
| end if; |
| |
| Warn_On_Instance := False; |
| |
| -- Set flag to suppress further warnings on same subprogram |
| -- unless in all errors mode |
| |
| if not All_Errors_Mode then |
| Set_Suppress_Elaboration_Warnings (E); |
| end if; |
| end Check_Internal_Call_Continue; |
| |
| ---------------------------- |
| -- Check_Task_Activation -- |
| ---------------------------- |
| |
| procedure Check_Task_Activation (N : Node_Id) is |
| Loc : constant Source_Ptr := Sloc (N); |
| Ent : Entity_Id; |
| P : Entity_Id; |
| Task_Scope : Entity_Id; |
| Cunit_SC : Boolean := False; |
| Decl : Node_Id; |
| Elmt : Elmt_Id; |
| Inter_Procs : Elist_Id := New_Elmt_List; |
| Intra_Procs : Elist_Id := New_Elmt_List; |
| Enclosing : Entity_Id; |
| |
| procedure Add_Task_Proc (Typ : Entity_Id); |
| -- Add to Task_Procs the task body procedure(s) of task types in Typ. |
| -- For record types, this procedure recurses over component types. |
| |
| procedure Collect_Tasks (Decls : List_Id); |
| -- Collect the types of the tasks that are to be activated in the given |
| -- list of declarations, in order to perform elaboration checks on the |
| -- corresponding task procedures which are called implicitly here. |
| |
| function Outer_Unit (E : Entity_Id) return Entity_Id; |
| -- find enclosing compilation unit of Entity, ignoring subunits, or |
| -- else enclosing subprogram. If E is not a package, there is no need |
| -- for inter-unit elaboration checks. |
| |
| ------------------- |
| -- Add_Task_Proc -- |
| ------------------- |
| |
| procedure Add_Task_Proc (Typ : Entity_Id) is |
| Comp : Entity_Id; |
| Proc : Entity_Id := Empty; |
| |
| begin |
| if Is_Task_Type (Typ) then |
| Proc := Get_Task_Body_Procedure (Typ); |
| |
| elsif Is_Array_Type (Typ) |
| and then Has_Task (Base_Type (Typ)) |
| then |
| Add_Task_Proc (Component_Type (Typ)); |
| |
| elsif Is_Record_Type (Typ) |
| and then Has_Task (Base_Type (Typ)) |
| then |
| Comp := First_Component (Typ); |
| |
| while Present (Comp) loop |
| Add_Task_Proc (Etype (Comp)); |
| Comp := Next_Component (Comp); |
| end loop; |
| end if; |
| |
| -- If the task type is another unit, we will perform the usual |
| -- elaboration check on its enclosing unit. If the type is in the |
| -- same unit, we can trace the task body as for an internal call, |
| -- but we only need to examine other external calls, because at |
| -- the point the task is activated, internal subprogram bodies |
| -- will have been elaborated already. We keep separate lists for |
| -- each kind of task. |
| |
| if Present (Proc) then |
| if Outer_Unit (Scope (Proc)) = Enclosing then |
| |
| if No (Corresponding_Body (Unit_Declaration_Node (Proc))) |
| and then |
| (not Is_Generic_Instance (Scope (Proc)) |
| or else |
| Scope (Proc) = Scope (Defining_Identifier (Decl))) |
| then |
| Error_Msg_N |
| ("task will be activated before elaboration of its body?", |
| Decl); |
| Error_Msg_N |
| ("Program_Error will be raised at run-time?", Decl); |
| |
| elsif |
| Present (Corresponding_Body (Unit_Declaration_Node (Proc))) |
| then |
| Append_Elmt (Proc, Intra_Procs); |
| end if; |
| |
| else |
| Elmt := First_Elmt (Inter_Procs); |
| |
| -- No need for multiple entries of the same type. |
| |
| while Present (Elmt) loop |
| if Node (Elmt) = Proc then |
| return; |
| end if; |
| |
| Next_Elmt (Elmt); |
| end loop; |
| |
| Append_Elmt (Proc, Inter_Procs); |
| end if; |
| end if; |
| end Add_Task_Proc; |
| |
| ------------------- |
| -- Collect_Tasks -- |
| ------------------- |
| |
| procedure Collect_Tasks (Decls : List_Id) is |
| begin |
| if Present (Decls) then |
| Decl := First (Decls); |
| |
| while Present (Decl) loop |
| |
| if Nkind (Decl) = N_Object_Declaration |
| and then Has_Task (Etype (Defining_Identifier (Decl))) |
| then |
| Add_Task_Proc (Etype (Defining_Identifier (Decl))); |
| end if; |
| |
| Next (Decl); |
| end loop; |
| end if; |
| end Collect_Tasks; |
| |
| ---------------- |
| -- Outer_Unit -- |
| ---------------- |
| |
| function Outer_Unit (E : Entity_Id) return Entity_Id is |
| Outer : Entity_Id := E; |
| |
| begin |
| while Present (Outer) loop |
| if Suppress_Elaboration_Checks (Outer) then |
| Cunit_SC := True; |
| end if; |
| |
| exit when Is_Child_Unit (Outer) |
| or else Scope (Outer) = Standard_Standard |
| or else Ekind (Outer) /= E_Package; |
| Outer := Scope (Outer); |
| end loop; |
| |
| return Outer; |
| end Outer_Unit; |
| |
| -- Start of processing for Check_Task_Activation |
| |
| begin |
| Enclosing := Outer_Unit (Current_Scope); |
| |
| -- Find all tasks declared in the current unit. |
| |
| if Nkind (N) = N_Package_Body then |
| P := Unit_Declaration_Node (Corresponding_Spec (N)); |
| |
| Collect_Tasks (Declarations (N)); |
| Collect_Tasks (Visible_Declarations (Specification (P))); |
| Collect_Tasks (Private_Declarations (Specification (P))); |
| |
| elsif Nkind (N) = N_Package_Declaration then |
| Collect_Tasks (Visible_Declarations (Specification (N))); |
| Collect_Tasks (Private_Declarations (Specification (N))); |
| |
| else |
| Collect_Tasks (Declarations (N)); |
| end if; |
| |
| -- We only perform detailed checks in all tasks are library level |
| -- entities. If the master is a subprogram or task, activation will |
| -- depend on the activation of the master itself. |
| -- Should dynamic checks be added in the more general case??? |
| |
| if Ekind (Enclosing) /= E_Package then |
| return; |
| end if; |
| |
| -- For task types defined in other units, we want the unit containing |
| -- the task body to be elaborated before the current one. |
| |
| Elmt := First_Elmt (Inter_Procs); |
| |
| while Present (Elmt) loop |
| Ent := Node (Elmt); |
| Task_Scope := Outer_Unit (Scope (Ent)); |
| |
| if not Is_Compilation_Unit (Task_Scope) then |
| null; |
| |
| elsif Suppress_Elaboration_Warnings (Task_Scope) then |
| null; |
| |
| elsif Dynamic_Elaboration_Checks then |
| if not Elaboration_Checks_Suppressed (Ent) |
| and then not Cunit_SC |
| and then not Restrictions (No_Entry_Calls_In_Elaboration_Code) |
| then |
| -- Runtime elaboration check required. generate check of the |
| -- elaboration Boolean for the unit containing the entity. |
| |
| Insert_Elab_Check (N, |
| Make_Attribute_Reference (Loc, |
| Attribute_Name => Name_Elaborated, |
| Prefix => |
| New_Occurrence_Of |
| (Spec_Entity (Task_Scope), Loc))); |
| end if; |
| |
| else |
| -- Force the binder to elaborate other unit first. |
| |
| if not Suppress_Elaboration_Warnings (Ent) |
| and then Elab_Warnings |
| and then not Suppress_Elaboration_Warnings (Task_Scope) |
| then |
| Error_Msg_Node_2 := Task_Scope; |
| Error_Msg_NE ("activation of an instance of task type&" & |
| " requires pragma Elaborate_All on &?", N, Ent); |
| end if; |
| |
| Set_Elaborate_All_Desirable (Task_Scope); |
| Set_Suppress_Elaboration_Warnings (Task_Scope); |
| end if; |
| |
| Next_Elmt (Elmt); |
| end loop; |
| |
| -- For tasks declared in the current unit, trace other calls within |
| -- the task procedure bodies, which are available. |
| |
| In_Task_Activation := True; |
| Elmt := First_Elmt (Intra_Procs); |
| |
| while Present (Elmt) loop |
| Ent := Node (Elmt); |
| Check_Internal_Call_Continue (N, Ent, Enclosing, Ent); |
| Next_Elmt (Elmt); |
| end loop; |
| |
| In_Task_Activation := False; |
| end Check_Task_Activation; |
| |
| ---------------------- |
| -- Has_Generic_Body -- |
| ---------------------- |
| |
| function Has_Generic_Body (N : Node_Id) return Boolean is |
| Ent : constant Entity_Id := Entity (Name (N)); |
| Decl : constant Node_Id := Unit_Declaration_Node (Ent); |
| Scop : Entity_Id; |
| |
| function Find_Body_In (E : Entity_Id; N : Node_Id) return Node_Id; |
| -- Determine if the list of nodes headed by N and linked by Next |
| -- contains a package body for the package spec entity E, and if |
| -- so return the package body. If not, then returns Empty. |
| |
| function Load_Package_Body (Nam : Unit_Name_Type) return Node_Id; |
| -- This procedure is called load the unit whose name is given by Nam. |
| -- This unit is being loaded to see whether it contains an optional |
| -- generic body. The returned value is the loaded unit, which is |
| -- always a package body (only package bodies can contain other |
| -- entities in the sense in which Has_Generic_Body is interested). |
| -- We only attempt to load bodies if we are generating code. If we |
| -- are in semantics check only mode, then it would be wrong to load |
| -- bodies that are not required from a semantic point of view, so |
| -- in this case we return Empty. The result is that the caller may |
| -- incorrectly decide that a generic spec does not have a body when |
| -- in fact it does, but the only harm in this is that some warnings |
| -- on elaboration problems may be lost in semantic checks only mode, |
| -- which is not big loss. We also return Empty if we go for a body |
| -- and it is not there. |
| |
| function Locate_Corresponding_Body (PE : Entity_Id) return Node_Id; |
| -- PE is the entity for a package spec. This function locates the |
| -- corresponding package body, returning Empty if none is found. |
| -- The package body returned is fully parsed but may not yet be |
| -- analyzed, so only syntactic fields should be referenced. |
| |
| ------------------ |
| -- Find_Body_In -- |
| ------------------ |
| |
| function Find_Body_In (E : Entity_Id; N : Node_Id) return Node_Id is |
| Nod : Node_Id; |
| |
| begin |
| Nod := N; |
| while Present (Nod) loop |
| |
| -- If we found the package body we are looking for, return it |
| |
| if Nkind (Nod) = N_Package_Body |
| and then Chars (Defining_Unit_Name (Nod)) = Chars (E) |
| then |
| return Nod; |
| |
| -- If we found the stub for the body, go after the subunit, |
| -- loading it if necessary. |
| |
| elsif Nkind (Nod) = N_Package_Body_Stub |
| and then Chars (Defining_Identifier (Nod)) = Chars (E) |
| then |
| if Present (Library_Unit (Nod)) then |
| return Unit (Library_Unit (Nod)); |
| |
| else |
| return Load_Package_Body (Get_Unit_Name (Nod)); |
| end if; |
| |
| -- If neither package body nor stub, keep looking on chain |
| |
| else |
| Next (Nod); |
| end if; |
| end loop; |
| |
| return Empty; |
| end Find_Body_In; |
| |
| ----------------------- |
| -- Load_Package_Body -- |
| ----------------------- |
| |
| function Load_Package_Body (Nam : Unit_Name_Type) return Node_Id is |
| U : Unit_Number_Type; |
| |
| begin |
| if Operating_Mode /= Generate_Code then |
| return Empty; |
| else |
| U := |
| Load_Unit |
| (Load_Name => Nam, |
| Required => False, |
| Subunit => False, |
| Error_Node => N); |
| |
| if U = No_Unit then |
| return Empty; |
| else |
| return Unit (Cunit (U)); |
| end if; |
| end if; |
| end Load_Package_Body; |
| |
| ------------------------------- |
| -- Locate_Corresponding_Body -- |
| ------------------------------- |
| |
| function Locate_Corresponding_Body (PE : Entity_Id) return Node_Id is |
| Spec : constant Node_Id := Declaration_Node (PE); |
| Decl : constant Node_Id := Parent (Spec); |
| Scop : constant Entity_Id := Scope (PE); |
| PBody : Node_Id; |
| |
| begin |
| if Is_Library_Level_Entity (PE) then |
| |
| -- If package is a library unit that requires a body, we have |
| -- no choice but to go after that body because it might contain |
| -- an optional body for the original generic package. |
| |
| if Unit_Requires_Body (PE) then |
| |
| -- Load the body. Note that we are a little careful here to |
| -- use Spec to get the unit number, rather than PE or Decl, |
| -- since in the case where the package is itself a library |
| -- level instantiation, Spec will properly reference the |
| -- generic template, which is what we really want. |
| |
| return |
| Load_Package_Body |
| (Get_Body_Name (Unit_Name (Get_Source_Unit (Spec)))); |
| |
| -- But if the package is a library unit that does NOT require |
| -- a body, then no body is permitted, so we are sure that there |
| -- is no body for the original generic package. |
| |
| else |
| return Empty; |
| end if; |
| |
| -- Otherwise look and see if we are embedded in a further package |
| |
| elsif Is_Package (Scop) then |
| |
| -- If so, get the body of the enclosing package, and look in |
| -- its package body for the package body we are looking for. |
| |
| PBody := Locate_Corresponding_Body (Scop); |
| |
| if No (PBody) then |
| return Empty; |
| else |
| return Find_Body_In (PE, First (Declarations (PBody))); |
| end if; |
| |
| -- If we are not embedded in a further package, then the body |
| -- must be in the same declarative part as we are. |
| |
| else |
| return Find_Body_In (PE, Next (Decl)); |
| end if; |
| end Locate_Corresponding_Body; |
| |
| -- Start of processing for Has_Generic_Body |
| |
| begin |
| if Present (Corresponding_Body (Decl)) then |
| return True; |
| |
| elsif Unit_Requires_Body (Ent) then |
| return True; |
| |
| -- Compilation units cannot have optional bodies |
| |
| elsif Is_Compilation_Unit (Ent) then |
| return False; |
| |
| -- Otherwise look at what scope we are in |
| |
| else |
| Scop := Scope (Ent); |
| |
| -- Case of entity is in other than a package spec, in this case |
| -- the body, if present, must be in the same declarative part. |
| |
| if not Is_Package (Scop) then |
| declare |
| P : Node_Id; |
| |
| begin |
| P := Declaration_Node (Ent); |
| |
| -- Declaration node may get us a spec, so if so, go to |
| -- the parent declaration. |
| |
| while not Is_List_Member (P) loop |
| P := Parent (P); |
| end loop; |
| |
| return Present (Find_Body_In (Ent, Next (P))); |
| end; |
| |
| -- If the entity is in a package spec, then we have to locate |
| -- the corresponding package body, and look there. |
| |
| else |
| declare |
| PBody : constant Node_Id := Locate_Corresponding_Body (Scop); |
| |
| begin |
| if No (PBody) then |
| return False; |
| else |
| return |
| Present |
| (Find_Body_In (Ent, (First (Declarations (PBody))))); |
| end if; |
| end; |
| end if; |
| end if; |
| end Has_Generic_Body; |
| |
| ----------------------- |
| -- Insert_Elab_Check -- |
| ----------------------- |
| |
| procedure Insert_Elab_Check (N : Node_Id; C : Node_Id := Empty) is |
| Nod : Node_Id; |
| Loc : constant Source_Ptr := Sloc (N); |
| |
| begin |
| -- If expansion is disabled, do not generate any checks. Also |
| -- skip checks if any subunits are missing because in either |
| -- case we lack the full information that we need, and no object |
| -- file will be created in any case. |
| |
| if not Expander_Active or else Subunits_Missing then |
| return; |
| end if; |
| |
| -- If we have a generic instantiation, where Instance_Spec is set, |
| -- then this field points to a generic instance spec that has |
| -- been inserted before the instantiation node itself, so that |
| -- is where we want to insert a check. |
| |
| if Nkind (N) in N_Generic_Instantiation |
| and then Present (Instance_Spec (N)) |
| then |
| Nod := Instance_Spec (N); |
| else |
| Nod := N; |
| end if; |
| |
| -- If we are inserting at the top level, insert in Aux_Decls |
| |
| if Nkind (Parent (Nod)) = N_Compilation_Unit then |
| declare |
| ADN : constant Node_Id := Aux_Decls_Node (Parent (Nod)); |
| R : Node_Id; |
| |
| begin |
| if No (C) then |
| R := Make_Raise_Program_Error (Loc); |
| else |
| R := Make_Raise_Program_Error (Loc, Make_Op_Not (Loc, C)); |
| end if; |
| |
| if No (Declarations (ADN)) then |
| Set_Declarations (ADN, New_List (R)); |
| else |
| Append_To (Declarations (ADN), R); |
| end if; |
| |
| Analyze (R); |
| end; |
| |
| -- Otherwise just insert before the node in question. However, if |
| -- the context of the call has already been analyzed, an insertion |
| -- will not work if it depends on subsequent expansion (e.g. a call in |
| -- a branch of a short-circuit). In that case we replace the call with |
| -- a conditional expression, or with a Raise if it is unconditional. |
| -- Unfortunately this does not work if the call has a dynamic size, |
| -- because gigi regards it as a dynamic-sized temporary. If such a call |
| -- appears in a short-circuit expression, the elaboration check will be |
| -- missed (rare enough ???). |
| |
| else |
| if Nkind (N) = N_Function_Call |
| and then Analyzed (Parent (N)) |
| and then Size_Known_At_Compile_Time (Etype (N)) |
| then |
| declare |
| Typ : constant Entity_Id := Etype (N); |
| R : constant Node_Id := Make_Raise_Program_Error (Loc); |
| Chk : constant Boolean := Do_Range_Check (N); |
| |
| begin |
| Set_Etype (R, Typ); |
| |
| if No (C) then |
| Rewrite (N, R); |
| |
| else |
| Rewrite (N, |
| Make_Conditional_Expression (Loc, |
| Expressions => New_List (C, Relocate_Node (N), R))); |
| end if; |
| |
| Analyze_And_Resolve (N, Typ); |
| |
| -- If the original call requires a range check, so does the |
| -- conditional expression. |
| |
| if Chk then |
| Enable_Range_Check (N); |
| else |
| Set_Do_Range_Check (N, False); |
| end if; |
| end; |
| |
| else |
| if No (C) then |
| Insert_Action (Nod, |
| Make_Raise_Program_Error (Loc)); |
| else |
| Insert_Action (Nod, |
| Make_Raise_Program_Error (Loc, |
| Condition => |
| Make_Op_Not (Loc, |
| Right_Opnd => C))); |
| end if; |
| end if; |
| end if; |
| end Insert_Elab_Check; |
| |
| ------------------ |
| -- Output_Calls -- |
| ------------------ |
| |
| procedure Output_Calls (N : Node_Id) is |
| Ent : Entity_Id; |
| |
| function Is_Printable_Error_Name (Nm : Name_Id) return Boolean; |
| -- An internal function, used to determine if a name, Nm, is either |
| -- a non-internal name, or is an internal name that is printable |
| -- by the error message circuits (i.e. it has a single upper |
| -- case letter at the end). |
| |
| function Is_Printable_Error_Name (Nm : Name_Id) return Boolean is |
| begin |
| if not Is_Internal_Name (Nm) then |
| return True; |
| |
| elsif Name_Len = 1 then |
| return False; |
| |
| else |
| Name_Len := Name_Len - 1; |
| return not Is_Internal_Name; |
| end if; |
| end Is_Printable_Error_Name; |
| |
| -- Start of processing for Output_Calls |
| |
| begin |
| for J in reverse 1 .. Elab_Call.Last loop |
| Error_Msg_Sloc := Elab_Call.Table (J).Cloc; |
| |
| Ent := Elab_Call.Table (J).Ent; |
| |
| if Is_Generic_Unit (Ent) then |
| Error_Msg_NE ("\?& instantiated #", N, Ent); |
| |
| elsif Chars (Ent) = Name_uInit_Proc then |
| Error_Msg_N ("\?initialization procedure called #", N); |
| |
| elsif Is_Printable_Error_Name (Chars (Ent)) then |
| Error_Msg_NE ("\?& called #", N, Ent); |
| |
| else |
| Error_Msg_N ("\? called #", N); |
| end if; |
| end loop; |
| end Output_Calls; |
| |
| ---------------------------- |
| -- Same_Elaboration_Scope -- |
| ---------------------------- |
| |
| function Same_Elaboration_Scope (Scop1, Scop2 : Entity_Id) return Boolean is |
| S1 : Entity_Id := Scop1; |
| S2 : Entity_Id := Scop2; |
| |
| begin |
| while S1 /= Standard_Standard |
| and then (Ekind (S1) = E_Package |
| or else |
| Ekind (S1) = E_Block) |
| loop |
| S1 := Scope (S1); |
| end loop; |
| |
| while S2 /= Standard_Standard |
| and then (Ekind (S2) = E_Package |
| or else |
| Ekind (S2) = E_Protected_Type |
| or else |
| Ekind (S2) = E_Block) |
| loop |
| S2 := Scope (S2); |
| end loop; |
| |
| return S1 = S2; |
| end Same_Elaboration_Scope; |
| |
| ----------------- |
| -- Set_C_Scope -- |
| ----------------- |
| |
| procedure Set_C_Scope is |
| begin |
| while not Is_Compilation_Unit (C_Scope) loop |
| C_Scope := Scope (C_Scope); |
| end loop; |
| end Set_C_Scope; |
| |
| ----------------- |
| -- Spec_Entity -- |
| ----------------- |
| |
| function Spec_Entity (E : Entity_Id) return Entity_Id is |
| Decl : Node_Id; |
| |
| begin |
| -- Check for case of body entity |
| -- Why is the check for E_Void needed??? |
| |
| if Ekind (E) = E_Void |
| or else Ekind (E) = E_Subprogram_Body |
| or else Ekind (E) = E_Package_Body |
| then |
| Decl := E; |
| |
| loop |
| Decl := Parent (Decl); |
| exit when Nkind (Decl) in N_Proper_Body; |
| end loop; |
| |
| return Corresponding_Spec (Decl); |
| |
| else |
| return E; |
| end if; |
| end Spec_Entity; |
| |
| ------------------- |
| -- Supply_Bodies -- |
| ------------------- |
| |
| procedure Supply_Bodies (N : Node_Id) is |
| begin |
| if Nkind (N) = N_Subprogram_Declaration then |
| declare |
| Ent : constant Entity_Id := Defining_Unit_Name (Specification (N)); |
| |
| begin |
| Set_Is_Imported (Ent); |
| Set_Convention (Ent, Convention_Stubbed); |
| end; |
| |
| elsif Nkind (N) = N_Package_Declaration then |
| declare |
| Spec : constant Node_Id := Specification (N); |
| |
| begin |
| New_Scope (Defining_Unit_Name (Spec)); |
| Supply_Bodies (Visible_Declarations (Spec)); |
| Supply_Bodies (Private_Declarations (Spec)); |
| Pop_Scope; |
| end; |
| end if; |
| end Supply_Bodies; |
| |
| procedure Supply_Bodies (L : List_Id) is |
| Elmt : Node_Id; |
| |
| begin |
| if Present (L) then |
| Elmt := First (L); |
| while Present (Elmt) loop |
| Supply_Bodies (Elmt); |
| Next (Elmt); |
| end loop; |
| end if; |
| end Supply_Bodies; |
| |
| ------------ |
| -- Within -- |
| ------------ |
| |
| function Within (E1, E2 : Entity_Id) return Boolean is |
| Scop : Entity_Id; |
| |
| begin |
| Scop := E1; |
| |
| loop |
| if Scop = E2 then |
| return True; |
| |
| elsif Scop = Standard_Standard then |
| return False; |
| |
| else |
| Scop := Scope (Scop); |
| end if; |
| end loop; |
| |
| raise Program_Error; |
| end Within; |
| |
| end Sem_Elab; |
