1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1997-2003 Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 with Atree; use Atree;
28 with Checks; use Checks;
29 with Debug; use Debug;
30 with Einfo; use Einfo;
31 with Elists; use Elists;
32 with Errout; use Errout;
33 with Exp_Tss; use Exp_Tss;
34 with Exp_Util; use Exp_Util;
35 with Expander; use Expander;
36 with Fname; use Fname;
38 with Lib.Load; use Lib.Load;
39 with Namet; use Namet;
40 with Nlists; use Nlists;
41 with Nmake; use Nmake;
43 with Output; use Output;
44 with Restrict; use Restrict;
46 with Sem_Cat; use Sem_Cat;
47 with Sem_Ch7; use Sem_Ch7;
48 with Sem_Ch8; use Sem_Ch8;
49 with Sem_Res; use Sem_Res;
50 with Sem_Util; use Sem_Util;
51 with Sinfo; use Sinfo;
52 with Sinput; use Sinput;
53 with Snames; use Snames;
54 with Stand; use Stand;
56 with Tbuild; use Tbuild;
57 with Uname; use Uname;
59 package body Sem_Elab is
61 -- The following table records the recursive call chain for output
62 -- in the Output routine. Each entry records the call node and the
63 -- entity of the called routine. The number of entries in the table
64 -- (i.e. the value of Elab_Call.Last) indicates the current depth
65 -- of recursion and is used to identify the outer level.
67 type Elab_Call_Entry is record
72 package Elab_Call is new Table.Table (
73 Table_Component_Type => Elab_Call_Entry,
74 Table_Index_Type => Int,
77 Table_Increment => 100,
78 Table_Name => "Elab_Call");
80 -- This table is initialized at the start of each outer level call.
81 -- It holds the entities for all subprograms that have been examined
82 -- for this particular outer level call, and is used to prevent both
83 -- infinite recursion, and useless reanalysis of bodies already seen
85 package Elab_Visited is new Table.Table (
86 Table_Component_Type => Entity_Id,
87 Table_Index_Type => Int,
90 Table_Increment => 100,
91 Table_Name => "Elab_Visited");
93 -- This table stores calls to Check_Internal_Call that are delayed
94 -- until all generics are instantiated, and in particular that all
95 -- generic bodies have been inserted. We need to delay, because we
96 -- need to be able to look through the inserted bodies.
98 type Delay_Element is record
100 -- The parameter N from the call to Check_Internal_Call. Note that
101 -- this node may get rewritten over the delay period by expansion
102 -- in the call case (but not in the instantiation case).
105 -- The parameter E from the call to Check_Internal_Call
107 Orig_Ent : Entity_Id;
108 -- The parameter Orig_Ent from the call to Check_Internal_Call
111 -- The current scope of the call. This is restored when we complete
112 -- the delayed call, so that we do this in the right scope.
114 From_Elab_Code : Boolean;
115 -- Save indication of whether this call is from elaboration code
117 Outer_Scope : Entity_Id;
118 -- Save scope of outer level call
122 package Delay_Check is new Table.Table (
123 Table_Component_Type => Delay_Element,
124 Table_Index_Type => Int,
125 Table_Low_Bound => 1,
126 Table_Initial => 1000,
127 Table_Increment => 100,
128 Table_Name => "Delay_Check");
131 -- Top level scope of current scope. We need to compute this only
132 -- once at the outer level, i.e. for a call to Check_Elab_Call from
133 -- outside this unit.
135 Outer_Level_Sloc : Source_Ptr;
136 -- Save Sloc value for outer level call node for comparisons of source
137 -- locations. A body is too late if it appears after the *outer* level
138 -- call, not the particular call that is being analyzed.
140 From_Elab_Code : Boolean;
141 -- This flag shows whether the outer level call currently being examined
142 -- is or is not in elaboration code. We are only interested in calls to
143 -- routines in other units if this flag is True.
145 In_Task_Activation : Boolean := False;
146 -- This flag indicates whether we are performing elaboration checks on
147 -- task procedures, at the point of activation. If true, we do not trace
148 -- internal calls in these procedures, because all local bodies are known
151 Delaying_Elab_Checks : Boolean := True;
152 -- This is set True till the compilation is complete, including the
153 -- insertion of all instance bodies. Then when Check_Elab_Calls is
154 -- called, the delay table is used to make the delayed calls and
155 -- this flag is reset to False, so that the calls are processed
157 -----------------------
158 -- Local Subprograms --
159 -----------------------
161 -- Note: Outer_Scope in all these calls represents the scope of
162 -- interest of the outer level call. If it is set to Standard_Standard,
163 -- then it means the outer level call was at elaboration level, and that
164 -- thus all calls are of interest. If it was set to some other scope,
165 -- then the original call was an inner call, and we are not interested
166 -- in calls that go outside this scope.
168 procedure Check_A_Call
171 Outer_Scope : Entity_Id;
172 Inter_Unit_Only : Boolean;
173 Generate_Warnings : Boolean := True);
174 -- This is the internal recursive routine that is called to check for
175 -- a possible elaboration error. The argument N is a subprogram call
176 -- or generic instantiation to be checked, and E is the entity of
177 -- the called subprogram, or instantiated generic unit. The flag
178 -- Outer_Scope is the outer level scope for the original call.
179 -- Inter_Unit_Only is set if the call is only to be checked in the
180 -- case where it is to another unit (and skipped if within a unit).
181 -- Generate_Warnings is set to False to suppress warning messages
182 -- about missing pragma Elaborate_All's. These messages are not
183 -- wanted for inner calls in the dynamic model.
185 procedure Check_Bad_Instantiation (N : Node_Id);
186 -- N is a node for an instantiation (if called with any other node kind,
187 -- Check_Bad_Instantiation ignores the call). This subprogram checks for
188 -- the special case of a generic instantiation of a generic spec in the
189 -- same declarative part as the instantiation where a body is present and
190 -- has not yet been seen. This is an obvious error, but needs to be checked
191 -- specially at the time of the instantiation, since it is a case where we
192 -- cannot insert the body anywhere. If this case is detected, warnings are
193 -- generated, and a raise of Program_Error is inserted. In addition any
194 -- subprograms in the generic spec are stubbed, and the Bad_Instantiation
195 -- flag is set on the instantiation node. The caller in Sem_Ch12 uses this
196 -- flag as an indication that no attempt should be made to insert an
199 procedure Check_Internal_Call
202 Outer_Scope : Entity_Id;
203 Orig_Ent : Entity_Id);
204 -- N is a function call or procedure statement call node and E is
205 -- the entity of the called function, which is within the current
206 -- compilation unit (where subunits count as part of the parent).
207 -- This call checks if this call, or any call within any accessed
208 -- body could cause an ABE, and if so, outputs a warning. Orig_Ent
209 -- differs from E only in the case of renamings, and points to the
210 -- original name of the entity. This is used for error messages.
211 -- Outer_Scope is the outer level scope for the original call.
213 procedure Check_Internal_Call_Continue
216 Outer_Scope : Entity_Id;
217 Orig_Ent : Entity_Id);
218 -- The processing for Check_Internal_Call is divided up into two phases,
219 -- and this represents the second phase. The second phase is delayed if
220 -- Delaying_Elab_Calls is set to True. In this delayed case, the first
221 -- phase makes an entry in the Delay_Check table, which is processed
222 -- when Check_Elab_Calls is called. N, E and Orig_Ent are as for the call
223 -- to Check_Internal_Call. Outer_Scope is the outer level scope for
224 -- the original call.
226 function Has_Generic_Body (N : Node_Id) return Boolean;
227 -- N is a generic package instantiation node, and this routine determines
228 -- if this package spec does in fact have a generic body. If so, then
229 -- True is returned, otherwise False. Note that this is not at all the
230 -- same as checking if the unit requires a body, since it deals with
231 -- the case of optional bodies accurately (i.e. if a body is optional,
232 -- then it looks to see if a body is actually present). Note: this
233 -- function can only do a fully correct job if in generating code mode
234 -- where all bodies have to be present. If we are operating in semantics
235 -- check only mode, then in some cases of optional bodies, a result of
236 -- False may incorrectly be given. In practice this simply means that
237 -- some cases of warnings for incorrect order of elaboration will only
238 -- be given when generating code, which is not a big problem (and is
239 -- inevitable, given the optional body semantics of Ada).
241 procedure Insert_Elab_Check (N : Node_Id; C : Node_Id := Empty);
242 -- Given code for an elaboration check (or unconditional raise if
243 -- the check is not needed), inserts the code in the appropriate
244 -- place. N is the call or instantiation node for which the check
245 -- code is required. C is the test whose failure triggers the raise.
247 procedure Output_Calls (N : Node_Id);
248 -- Outputs chain of calls stored in the Elab_Call table. The caller
249 -- has already generated the main warning message, so the warnings
250 -- generated are all continuation messages. The argument is the
251 -- call node at which the messages are to be placed.
253 function Same_Elaboration_Scope (Scop1, Scop2 : Entity_Id) return Boolean;
254 -- Given two scopes, determine whether they are the same scope from an
255 -- elaboration point of view, i.e. packages and blocks are ignored.
257 procedure Set_C_Scope;
258 -- On entry C_Scope is set to some scope. On return, C_Scope is reset
259 -- to be the enclosing compilation unit of this scope.
261 function Spec_Entity (E : Entity_Id) return Entity_Id;
262 -- Given a compilation unit entity, if it is a spec entity, it is
263 -- returned unchanged. If it is a body entity, then the spec for
264 -- the corresponding spec is returned
266 procedure Supply_Bodies (N : Node_Id);
267 -- Given a node, N, that is either a subprogram declaration or a package
268 -- declaration, this procedure supplies dummy bodies for the subprogram
269 -- or for all subprograms in the package. If the given node is not one
270 -- of these two possibilities, then Supply_Bodies does nothing. The
271 -- dummy body is supplied by setting the subprogram to be Imported with
272 -- convention Stubbed.
274 procedure Supply_Bodies (L : List_Id);
275 -- Calls Supply_Bodies for all elements of the given list L.
277 function Within (E1, E2 : Entity_Id) return Boolean;
278 -- Given two scopes E1 and E2, returns True if E1 is equal to E2, or
279 -- is one of its contained scopes, False otherwise.
281 function Within_Elaborate_All (E : Entity_Id) return Boolean;
282 -- Before emitting a warning on a scope E for a missing elaborate_all,
283 -- check whether E may be in the context of a directly visible unit
284 -- U to which the pragma applies. This prevents spurious warnings when
285 -- the called entity is renamed within U.
291 procedure Check_A_Call
294 Outer_Scope : Entity_Id;
295 Inter_Unit_Only : Boolean;
296 Generate_Warnings : Boolean := True)
298 Loc : constant Source_Ptr := Sloc (N);
303 -- Top level scope of entity for called subprogram
305 Body_Acts_As_Spec : Boolean;
306 -- Set to true if call is to body acting as spec (no separate spec)
308 Inst_Case : constant Boolean := Nkind (N) in N_Generic_Instantiation;
309 -- Indicates if we have instantiation case
311 Caller_Unit_Internal : Boolean;
312 Callee_Unit_Internal : Boolean;
314 Inst_Caller : Source_Ptr;
315 Inst_Callee : Source_Ptr;
317 Unit_Caller : Unit_Number_Type;
318 Unit_Callee : Unit_Number_Type;
320 Cunit_SC : Boolean := False;
321 -- Set to suppress dynamic elaboration checks where one of the
322 -- enclosing scopes has Elaboration_Checks_Suppressed set, or else
323 -- if a pragma Elaborate (_All) applies to that scope, in which case
324 -- warnings on the scope are also suppressed. For the internal case,
325 -- we ignore this flag.
328 -- Go to parent for derived subprogram, or to original subprogram
329 -- in the case of a renaming (Alias covers both these cases)
333 if (Suppress_Elaboration_Warnings (Ent)
334 or else Elaboration_Checks_Suppressed (Ent))
335 and then (Inst_Case or else No (Alias (Ent)))
340 -- Nothing to do for imported entities,
342 if Is_Imported (Ent) then
346 exit when Inst_Case or else No (Alias (Ent));
350 Decl := Unit_Declaration_Node (Ent);
352 if Nkind (Decl) = N_Subprogram_Body then
353 Body_Acts_As_Spec := True;
355 elsif Nkind (Decl) = N_Subprogram_Declaration
356 or else Nkind (Decl) = N_Subprogram_Body_Stub
359 Body_Acts_As_Spec := False;
361 -- If we have none of an instantiation, subprogram body or
362 -- subprogram declaration, then it is not a case that we want
363 -- to check. (One case is a call to a generic formal subprogram,
364 -- where we do not want the check in the template).
372 if Elaboration_Checks_Suppressed (E_Scope)
373 or else Suppress_Elaboration_Warnings (E_Scope)
378 -- Exit when we get to compilation unit, not counting subunits
380 exit when Is_Compilation_Unit (E_Scope)
381 and then (Is_Child_Unit (E_Scope)
382 or else Scope (E_Scope) = Standard_Standard);
384 -- If we did not find a compilation unit, other than standard,
385 -- then nothing to check (happens in some instantiation cases)
387 if E_Scope = Standard_Standard then
390 -- Otherwise move up a scope looking for compilation unit
393 E_Scope := Scope (E_Scope);
397 -- No checks needed for pure or preelaborated compilation units
400 or else Is_Preelaborated (E_Scope)
405 -- If the generic entity is within a deeper instance than we are, then
406 -- either the instantiation to which we refer itself caused an ABE, in
407 -- which case that will be handled separately. Otherwise, we know that
408 -- the body we need appears as needed at the point of the instantiation.
409 -- However, this assumption is only valid if we are in static mode.
411 if not Dynamic_Elaboration_Checks
412 and then Instantiation_Depth (Sloc (Ent)) >
413 Instantiation_Depth (Sloc (N))
418 -- Do not give a warning for a package with no body
420 if Ekind (Ent) = E_Generic_Package
421 and then not Has_Generic_Body (N)
426 -- Case of entity is not in current unit (i.e. with'ed unit case)
428 if E_Scope /= C_Scope then
430 -- We are only interested in such calls if the outer call was from
431 -- elaboration code, or if we are in Dynamic_Elaboration_Checks mode.
433 if not From_Elab_Code and then not Dynamic_Elaboration_Checks then
437 -- Nothing to do if some scope said that no checks were required
443 -- Nothing to do for a generic instance, because in this case
444 -- the checking was at the point of instantiation of the generic
445 -- However, this shortcut is only applicable in static mode.
447 if Is_Generic_Instance (Ent) and not Dynamic_Elaboration_Checks then
451 -- Nothing to do if subprogram with no separate spec. However,
452 -- a call to Deep_Initialize may result in a call to a user-defined
453 -- Initialize procedure, which imposes a body dependency. This
454 -- happens only if the type is controlled and the Initialize
455 -- procedure is not inherited.
457 if Body_Acts_As_Spec then
458 if Is_TSS (Ent, TSS_Deep_Initialize) then
463 Typ := Etype (Next_Formal (First_Formal (Ent)));
465 if not Is_Controlled (Typ) then
468 Init := Find_Prim_Op (Typ, Name_Initialize);
470 if Comes_From_Source (Init) then
483 -- Check cases of internal units
485 Callee_Unit_Internal :=
486 Is_Internal_File_Name
487 (Unit_File_Name (Get_Source_Unit (E_Scope)));
489 -- Do not give a warning if the with'ed unit is internal
490 -- and this is the generic instantiation case (this saves a
491 -- lot of hassle dealing with the Text_IO special child units)
493 if Callee_Unit_Internal and Inst_Case then
497 if C_Scope = Standard_Standard then
498 Caller_Unit_Internal := False;
500 Caller_Unit_Internal :=
501 Is_Internal_File_Name
502 (Unit_File_Name (Get_Source_Unit (C_Scope)));
505 -- Do not give a warning if the with'ed unit is internal
506 -- and the caller is not internal (since the binder always
507 -- elaborates internal units first).
509 if Callee_Unit_Internal and (not Caller_Unit_Internal) then
513 -- For now, if debug flag -gnatdE is not set, do no checking for
514 -- one internal unit withing another. This fixes the problem with
515 -- the sgi build and storage errors. To be resolved later ???
517 if (Callee_Unit_Internal and Caller_Unit_Internal)
518 and then not Debug_Flag_EE
523 if Is_TSS (E, TSS_Deep_Initialize) then
527 -- If the call is in an instance, and the called entity is not
528 -- defined in the same instance, then the elaboration issue
529 -- focuses around the unit containing the template, it is
530 -- this unit which requires an Elaborate_All.
532 -- However, if we are doing dynamic elaboration, we need to
533 -- chase the call in the usual manner.
535 -- We do not handle the case of calling a generic formal correctly
536 -- in the static case. See test 4703-004 to explore this gap ???
538 Inst_Caller := Instantiation (Get_Source_File_Index (Sloc (N)));
539 Inst_Callee := Instantiation (Get_Source_File_Index (Sloc (Ent)));
541 if Inst_Caller = No_Location then
542 Unit_Caller := No_Unit;
544 Unit_Caller := Get_Source_Unit (N);
547 if Inst_Callee = No_Location then
548 Unit_Callee := No_Unit;
550 Unit_Callee := Get_Source_Unit (Ent);
553 if Unit_Caller /= No_Unit
554 and then Unit_Callee /= Unit_Caller
555 and then not Dynamic_Elaboration_Checks
557 E_Scope := Spec_Entity (Cunit_Entity (Unit_Caller));
559 -- If we don't get a spec entity, just ignore call. Not
560 -- quite clear why this check is necessary.
566 -- Otherwise step to enclosing compilation unit
568 while not Is_Compilation_Unit (E_Scope) loop
569 E_Scope := Scope (E_Scope);
572 -- For the case N is not an instance, or a call within instance
573 -- We recompute E_Scope for the error message, since we
574 -- do NOT want to go to the unit which has the ultimate
575 -- declaration in the case of renaming and derivation and
576 -- we also want to go to the generic unit in the case of
577 -- an instance, and no further.
580 -- Loop to carefully follow renamings and derivations
581 -- one step outside the current unit, but not further.
584 and then Present (Alias (Ent))
586 E_Scope := Alias (Ent);
592 while not Is_Compilation_Unit (E_Scope) loop
593 E_Scope := Scope (E_Scope);
596 -- If E_Scope is the same as C_Scope, it means that there
597 -- definitely was a local renaming or derivation, and we
598 -- are not yet out of the current unit.
600 exit when E_Scope /= C_Scope;
604 -- If no alias, there is a previous error.
612 if Within_Elaborate_All (E_Scope) then
616 if not Suppress_Elaboration_Warnings (Ent)
617 and then not Elaboration_Checks_Suppressed (Ent)
618 and then not Suppress_Elaboration_Warnings (E_Scope)
619 and then not Elaboration_Checks_Suppressed (E_Scope)
620 and then Elab_Warnings
621 and then Generate_Warnings
625 ("instantiation of& may raise Program_Error?", N, Ent);
627 if Is_Init_Proc (Entity (Name (N)))
628 and then Comes_From_Source (Ent)
631 ("implicit call to & in initialization" &
632 " may raise Program_Error?", N, Ent);
633 E_Scope := Scope (Entity (Name (N)));
637 ("call to & may raise Program_Error?", N, Ent);
640 if Unit_Callee = No_Unit
641 and then E_Scope = Current_Scope
643 -- The missing pragma cannot be on the current unit, so
644 -- place it on the compilation unit that contains the
645 -- called entity, which is more likely to be right.
649 while not Is_Compilation_Unit (E_Scope) loop
650 E_Scope := Scope (E_Scope);
655 Error_Msg_Qual_Level := Nat'Last;
657 ("\missing pragma Elaborate_All for&?", N, E_Scope);
658 Error_Msg_Qual_Level := 0;
661 -- Set flag to prevent further warnings for same unit
662 -- unless in All_Errors_Mode.
664 if not All_Errors_Mode and not Dynamic_Elaboration_Checks then
665 Set_Suppress_Elaboration_Warnings (E_Scope, True);
669 -- Check for runtime elaboration check required
671 if Dynamic_Elaboration_Checks then
672 if not Elaboration_Checks_Suppressed (Ent)
673 and then not Elaboration_Checks_Suppressed (E_Scope)
674 and then not Cunit_SC
676 -- Runtime elaboration check required. Generate check of the
677 -- elaboration Boolean for the unit containing the entity.
679 Insert_Elab_Check (N,
680 Make_Attribute_Reference (Loc,
681 Attribute_Name => Name_Elaborated,
684 (Spec_Entity (E_Scope), Loc)));
687 -- If no dynamic check required, then ask binder to guarantee
688 -- that the necessary elaborations will be done properly!
691 if not Suppress_Elaboration_Warnings (E)
692 and then not Elaboration_Checks_Suppressed (E)
693 and then not Suppress_Elaboration_Warnings (E_Scope)
694 and then not Elaboration_Checks_Suppressed (E_Scope)
695 and then Elab_Warnings
696 and then Generate_Warnings
697 and then not Inst_Case
699 Error_Msg_Node_2 := E_Scope;
700 Error_Msg_NE ("call to& in elaboration code " &
701 "requires pragma Elaborate_All on&?", N, E);
704 Set_Elaborate_All_Desirable (E_Scope);
705 Set_Suppress_Elaboration_Warnings (E_Scope, True);
708 -- Case of entity is in same unit as call or instantiation
710 elsif not Inter_Unit_Only then
711 Check_Internal_Call (N, Ent, Outer_Scope, E);
715 -----------------------------
716 -- Check_Bad_Instantiation --
717 -----------------------------
719 procedure Check_Bad_Instantiation (N : Node_Id) is
723 -- Nothing to do if we do not have an instantiation (happens in some
724 -- error cases, and also in the formal package declaration case)
726 if Nkind (N) not in N_Generic_Instantiation then
729 -- Nothing to do if serious errors detected (avoid cascaded errors)
731 elsif Serious_Errors_Detected /= 0 then
734 -- Nothing to do if not in full analysis mode
736 elsif not Full_Analysis then
739 -- Nothing to do if inside a generic template
741 elsif Inside_A_Generic then
744 -- Nothing to do if a library level instantiation
746 elsif Nkind (Parent (N)) = N_Compilation_Unit then
749 -- Nothing to do if we are compiling a proper body for semantic
750 -- purposes only. The generic body may be in another proper body.
753 Nkind (Parent (Unit_Declaration_Node (Main_Unit_Entity))) = N_Subunit
758 Ent := Get_Generic_Entity (N);
760 -- The case we are interested in is when the generic spec is in the
761 -- current declarative part
763 if not Same_Elaboration_Scope (Current_Scope, Scope (Ent))
764 or else not In_Same_Extended_Unit (Sloc (N), Sloc (Ent))
769 -- If the generic entity is within a deeper instance than we are, then
770 -- either the instantiation to which we refer itself caused an ABE, in
771 -- which case that will be handled separately. Otherwise, we know that
772 -- the body we need appears as needed at the point of the instantiation.
773 -- If they are both at the same level but not within the same instance
774 -- then the body of the generic will be in the earlier instance.
777 D1 : constant Int := Instantiation_Depth (Sloc (Ent));
778 D2 : constant Int := Instantiation_Depth (Sloc (N));
785 and then Is_Generic_Instance (Scope (Ent))
786 and then not In_Open_Scopes (Scope (Ent))
792 -- Now we can proceed, if the entity being called has a completion,
793 -- then we are definitely OK, since we have already seen the body.
795 if Has_Completion (Ent) then
799 -- If there is no body, then nothing to do
801 if not Has_Generic_Body (N) then
805 -- Here we definitely have a bad instantiation
808 ("?cannot instantiate& before body seen", N, Ent);
810 if Present (Instance_Spec (N)) then
811 Supply_Bodies (Instance_Spec (N));
815 ("\?Program_Error will be raised at run time", N);
816 Insert_Elab_Check (N);
817 Set_ABE_Is_Certain (N);
819 end Check_Bad_Instantiation;
821 ---------------------
822 -- Check_Elab_Call --
823 ---------------------
825 procedure Check_Elab_Call
827 Outer_Scope : Entity_Id := Empty)
834 -- For an entry call, check relevant restriction
836 if Nkind (N) = N_Entry_Call_Statement
837 and then not In_Subprogram_Or_Concurrent_Unit
839 Check_Restriction (No_Entry_Calls_In_Elaboration_Code, N);
841 -- Nothing to do if this is not a call (happens in some error
842 -- conditions, and in some cases where rewriting occurs).
844 elsif Nkind (N) /= N_Function_Call
845 and then Nkind (N) /= N_Procedure_Call_Statement
849 -- Nothing to do if this is a call already rewritten for elab checking.
851 elsif Nkind (Parent (N)) = N_Conditional_Expression then
854 -- Nothing to do if inside a generic template
856 elsif Inside_A_Generic
857 and then not Present (Enclosing_Generic_Body (N))
862 -- Here we have a call at elaboration time which must be checked
864 if Debug_Flag_LL then
865 Write_Str (" Check_Elab_Call: ");
868 or else not Is_Entity_Name (Name (N))
870 Write_Str ("<<not entity name>> ");
872 Write_Name (Chars (Entity (Name (N))));
875 Write_Str (" call at ");
876 Write_Location (Sloc (N));
880 -- Climb up the tree to make sure we are not inside a
881 -- default expression of a parameter specification or
882 -- a record component, since in both these cases, we
883 -- will be doing the actual call later, not now, and it
884 -- is at the time of the actual call (statically speaking)
885 -- that we must do our static check, not at the time of
886 -- its initial analysis).
889 while Present (P) loop
890 if Nkind (P) = N_Parameter_Specification
892 Nkind (P) = N_Component_Declaration
900 -- Stuff that happens only at the outer level
902 if No (Outer_Scope) then
903 Elab_Visited.Set_Last (0);
905 -- Nothing to do if current scope is Standard (this is a bit
906 -- odd, but it happens in the case of generic instantiations).
908 C_Scope := Current_Scope;
910 if C_Scope = Standard_Standard then
914 -- First case, we are in elaboration code
916 From_Elab_Code := not In_Subprogram_Or_Concurrent_Unit;
917 if From_Elab_Code then
919 -- Complain if call that comes from source in preelaborated
920 -- unit and we are not inside a subprogram (i.e. we are in
923 if Comes_From_Source (N)
924 and then In_Preelaborated_Unit
925 and then not In_Inlined_Body
928 ("non-static call not allowed in preelaborated unit", N);
932 -- Second case, we are inside a subprogram or concurrent unit
933 -- i.e, we are not in elaboration code.
936 -- In this case, the issue is whether we are inside the
937 -- declarative part of the unit in which we live, or inside
938 -- its statements. In the latter case, there is no issue of
939 -- ABE calls at this level (a call from outside to the unit
940 -- in which we live might cause an ABE, but that will be
941 -- detected when we analyze that outer level call, as it
942 -- recurses into the called unit).
944 -- Climb up the tree, doing this test, and also testing
945 -- for being inside a default expression, which, as
946 -- discussed above, is not checked at this stage.
955 -- If we find a parentless subtree, it seems safe to
956 -- assume that we are not in a declarative part and
957 -- that no checking is required.
963 if Is_List_Member (P) then
964 L := List_Containing (P);
971 exit when Nkind (P) = N_Subunit;
973 -- Filter out case of default expressions, where
974 -- we do not do the check at this stage.
976 if Nkind (P) = N_Parameter_Specification
978 Nkind (P) = N_Component_Declaration
983 if Nkind (P) = N_Subprogram_Body
985 Nkind (P) = N_Protected_Body
987 Nkind (P) = N_Task_Body
989 Nkind (P) = N_Block_Statement
991 if L = Declarations (P) then
994 -- We are not in elaboration code, but we are doing
995 -- dynamic elaboration checks, in this case, we still
996 -- need to do the call, since the subprogram we are in
997 -- could be called from another unit, also in dynamic
998 -- elaboration check mode, at elaboration time.
1000 elsif Dynamic_Elaboration_Checks then
1002 -- This is a rather new check, going into version
1003 -- 3.14a1 for the first time (V1.80 of this unit),
1004 -- so we provide a debug flag to enable it. That
1005 -- way we have an easy work around for regressions
1006 -- that are caused by this new check. This debug
1007 -- flag can be removed later.
1009 if Debug_Flag_DD then
1013 -- Do the check in this case
1017 -- Static model, call is not in elaboration code, we
1018 -- never need to worry, because in the static model
1019 -- the top level caller always takes care of things.
1030 -- Retrieve called entity. If this is a call to a protected subprogram,
1031 -- the entity is a selected component.
1032 -- The callable entity may be absent, in which case there is nothing
1033 -- to do. This happens with non-analyzed calls in nested generics.
1040 elsif Nkind (Nam) = N_Selected_Component then
1041 Ent := Entity (Selector_Name (Nam));
1043 elsif not Is_Entity_Name (Nam) then
1047 Ent := Entity (Nam);
1054 -- Nothing to do if this is a recursive call (i.e. a call to
1055 -- an entity that is already in the Elab_Call stack)
1057 for J in 1 .. Elab_Visited.Last loop
1058 if Ent = Elab_Visited.Table (J) then
1063 -- See if we need to analyze this call. We analyze it if either of
1064 -- the following conditions is met:
1066 -- It is an inner level call (since in this case it was triggered
1067 -- by an outer level call from elaboration code), but only if the
1068 -- call is within the scope of the original outer level call.
1070 -- It is an outer level call from elaboration code, or the called
1071 -- entity is in the same elaboration scope.
1073 -- And in these cases, we will check both inter-unit calls and
1074 -- intra-unit (within a single unit) calls.
1076 C_Scope := Current_Scope;
1078 -- If not outer level call, then we follow it if it is within
1079 -- the original scope of the outer call.
1081 if Present (Outer_Scope)
1082 and then Within (Scope (Ent), Outer_Scope)
1085 Check_A_Call (N, Ent, Outer_Scope, Inter_Unit_Only => False);
1087 elsif Elaboration_Checks_Suppressed (Current_Scope) then
1090 elsif From_Elab_Code then
1092 Check_A_Call (N, Ent, Standard_Standard, Inter_Unit_Only => False);
1094 elsif Same_Elaboration_Scope (C_Scope, Scope (Ent)) then
1096 Check_A_Call (N, Ent, Scope (Ent), Inter_Unit_Only => False);
1098 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode
1099 -- is set, then we will do the check, but only in the inter-unit case
1100 -- (this is to accommodate unguarded elaboration calls from other units
1101 -- in which this same mode is set). We don't want warnings in this case,
1102 -- it would generate warnings having nothing to do with elaboration.
1104 elsif Dynamic_Elaboration_Checks then
1110 Inter_Unit_Only => True,
1111 Generate_Warnings => False);
1113 -- Otherwise nothing to do
1119 -- A call to an Init_Proc in elaboration code may bring additional
1120 -- dependencies, if some of the record components thereof have
1121 -- initializations that are function calls that come from source.
1122 -- We treat the current node as a call to each of these functions,
1123 -- to check their elaboration impact.
1125 if Is_Init_Proc (Ent)
1126 and then From_Elab_Code
1128 Process_Init_Proc : declare
1129 Unit_Decl : constant Node_Id := Unit_Declaration_Node (Ent);
1131 function Process (Nod : Node_Id) return Traverse_Result;
1132 -- Find subprogram calls within body of init_proc for
1133 -- Traverse instantiation below.
1135 function Process (Nod : Node_Id) return Traverse_Result is
1139 if (Nkind (Nod) = N_Function_Call
1140 or else Nkind (Nod) = N_Procedure_Call_Statement)
1141 and then Is_Entity_Name (Name (Nod))
1143 Func := Entity (Name (Nod));
1145 if Comes_From_Source (Func) then
1147 (N, Func, Standard_Standard, Inter_Unit_Only => True);
1157 procedure Traverse_Body is new Traverse_Proc (Process);
1159 -- Start of processing for Process_Init_Proc
1162 if Nkind (Unit_Decl) = N_Subprogram_Body then
1163 Traverse_Body (Handled_Statement_Sequence (Unit_Decl));
1165 end Process_Init_Proc;
1167 end Check_Elab_Call;
1169 ----------------------
1170 -- Check_Elab_Calls --
1171 ----------------------
1173 procedure Check_Elab_Calls is
1175 -- If expansion is disabled, do not generate any checks. Also
1176 -- skip checks if any subunits are missing because in either
1177 -- case we lack the full information that we need, and no object
1178 -- file will be created in any case.
1180 if not Expander_Active
1181 or else Is_Generic_Unit (Cunit_Entity (Main_Unit))
1182 or else Subunits_Missing
1187 -- Skip delayed calls if we had any errors
1189 if Serious_Errors_Detected = 0 then
1190 Delaying_Elab_Checks := False;
1191 Expander_Mode_Save_And_Set (True);
1193 for J in Delay_Check.First .. Delay_Check.Last loop
1194 New_Scope (Delay_Check.Table (J).Curscop);
1195 From_Elab_Code := Delay_Check.Table (J).From_Elab_Code;
1197 Check_Internal_Call_Continue (
1198 N => Delay_Check.Table (J).N,
1199 E => Delay_Check.Table (J).E,
1200 Outer_Scope => Delay_Check.Table (J).Outer_Scope,
1201 Orig_Ent => Delay_Check.Table (J).Orig_Ent);
1206 -- Set Delaying_Elab_Checks back on for next main compilation
1208 Expander_Mode_Restore;
1209 Delaying_Elab_Checks := True;
1211 end Check_Elab_Calls;
1213 ------------------------------
1214 -- Check_Elab_Instantiation --
1215 ------------------------------
1217 procedure Check_Elab_Instantiation
1219 Outer_Scope : Entity_Id := Empty)
1224 -- Check for and deal with bad instantiation case. There is some
1225 -- duplicated code here, but we will worry about this later ???
1227 Check_Bad_Instantiation (N);
1229 if ABE_Is_Certain (N) then
1233 -- Nothing to do if we do not have an instantiation (happens in some
1234 -- error cases, and also in the formal package declaration case)
1236 if Nkind (N) not in N_Generic_Instantiation then
1240 -- Nothing to do if inside a generic template
1242 if Inside_A_Generic then
1246 Ent := Get_Generic_Entity (N);
1247 From_Elab_Code := not In_Subprogram_Or_Concurrent_Unit;
1249 -- See if we need to analyze this instantiation. We analyze it if
1250 -- either of the following conditions is met:
1252 -- It is an inner level instantiation (since in this case it was
1253 -- triggered by an outer level call from elaboration code), but
1254 -- only if the instantiation is within the scope of the original
1255 -- outer level call.
1257 -- It is an outer level instantiation from elaboration code, or the
1258 -- instantiated entity is in the same elaboratoin scope.
1260 -- And in these cases, we will check both the inter-unit case and
1261 -- the intra-unit (within a single unit) case.
1263 C_Scope := Current_Scope;
1265 if Present (Outer_Scope)
1266 and then Within (Scope (Ent), Outer_Scope)
1269 Check_A_Call (N, Ent, Outer_Scope, Inter_Unit_Only => False);
1271 elsif From_Elab_Code then
1273 Check_A_Call (N, Ent, Standard_Standard, Inter_Unit_Only => False);
1275 elsif Same_Elaboration_Scope (C_Scope, Scope (Ent)) then
1277 Check_A_Call (N, Ent, Scope (Ent), Inter_Unit_Only => False);
1279 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode
1280 -- is set, then we will do the check, but only in the inter-unit case
1281 -- (this is to accommodate unguarded elaboration calls from other units
1282 -- in which this same mode is set). We inhibit warnings in this case,
1283 -- since this instantiation is not occurring in elaboration code.
1285 elsif Dynamic_Elaboration_Checks then
1291 Inter_Unit_Only => True,
1292 Generate_Warnings => False);
1297 end Check_Elab_Instantiation;
1299 -------------------------
1300 -- Check_Internal_Call --
1301 -------------------------
1303 procedure Check_Internal_Call
1306 Outer_Scope : Entity_Id;
1307 Orig_Ent : Entity_Id)
1309 Inst_Case : constant Boolean := Nkind (N) in N_Generic_Instantiation;
1312 -- If not function or procedure call or instantiation, then ignore
1313 -- call (this happens in some error case and rewriting cases)
1315 if Nkind (N) /= N_Function_Call
1317 Nkind (N) /= N_Procedure_Call_Statement
1323 -- Nothing to do if this is a call or instantiation that has
1324 -- already been found to be a sure ABE
1326 elsif ABE_Is_Certain (N) then
1329 -- Nothing to do if errors already detected (avoid cascaded errors)
1331 elsif Serious_Errors_Detected /= 0 then
1334 -- Nothing to do if not in full analysis mode
1336 elsif not Full_Analysis then
1339 -- Nothing to do if within a default expression, since the call
1340 -- is not actualy being made at this time.
1342 elsif In_Default_Expression then
1345 -- Nothing to do for call to intrinsic subprogram
1347 elsif Is_Intrinsic_Subprogram (E) then
1350 -- No need to trace local calls if checking task activation, because
1351 -- other local bodies are elaborated already.
1353 elsif In_Task_Activation then
1357 -- Delay this call if we are still delaying calls
1359 if Delaying_Elab_Checks then
1360 Delay_Check.Increment_Last;
1361 Delay_Check.Table (Delay_Check.Last) :=
1364 Orig_Ent => Orig_Ent,
1365 Curscop => Current_Scope,
1366 Outer_Scope => Outer_Scope,
1367 From_Elab_Code => From_Elab_Code);
1370 -- Otherwise, call phase 2 continuation right now
1373 Check_Internal_Call_Continue (N, E, Outer_Scope, Orig_Ent);
1376 end Check_Internal_Call;
1378 ----------------------------------
1379 -- Check_Internal_Call_Continue --
1380 ----------------------------------
1382 procedure Check_Internal_Call_Continue
1385 Outer_Scope : Entity_Id;
1386 Orig_Ent : Entity_Id)
1388 Loc : constant Source_Ptr := Sloc (N);
1389 Inst_Case : constant Boolean := Is_Generic_Unit (E);
1394 function Process (N : Node_Id) return Traverse_Result;
1395 -- Function applied to each node as we traverse the body.
1396 -- Checks for call that needs checking, and if so checks
1397 -- it. Always returns OK, so entire tree is traversed.
1403 function Process (N : Node_Id) return Traverse_Result is
1405 -- If user has specified that there are no entry calls in elaboration
1406 -- code, do not trace past an accept statement, because the rendez-
1407 -- vous will happen after elaboration.
1409 if (Nkind (Original_Node (N)) = N_Accept_Statement
1410 or else Nkind (Original_Node (N)) = N_Selective_Accept)
1411 and then Restrictions (No_Entry_Calls_In_Elaboration_Code)
1415 -- If we have a subprogram call, check it
1417 elsif Nkind (N) = N_Function_Call
1418 or else Nkind (N) = N_Procedure_Call_Statement
1420 Check_Elab_Call (N, Outer_Scope);
1423 -- If we have a generic instantiation, check it
1425 elsif Nkind (N) in N_Generic_Instantiation then
1426 Check_Elab_Instantiation (N, Outer_Scope);
1429 -- Skip subprogram bodies that come from source (wait for
1430 -- call to analyze these). The reason for the come from
1431 -- source test is to avoid catching task bodies.
1433 -- For task bodies, we should really avoid these too, waiting
1434 -- for the task activation, but that's too much trouble to
1435 -- catch for now, so we go in unconditionally. This is not
1436 -- so terrible, it means the error backtrace is not quite
1437 -- complete, and we are too eager to scan bodies of tasks
1438 -- that are unused, but this is hardly very significant!
1440 elsif Nkind (N) = N_Subprogram_Body
1441 and then Comes_From_Source (N)
1450 procedure Traverse is new Atree.Traverse_Proc;
1451 -- Traverse procedure using above Process function
1453 -- Start of processing for Check_Internal_Call_Continue
1456 -- Save outer level call if at outer level
1458 if Elab_Call.Last = 0 then
1459 Outer_Level_Sloc := Loc;
1462 Elab_Visited.Increment_Last;
1463 Elab_Visited.Table (Elab_Visited.Last) := E;
1465 -- If the call is to a function that renames a literal, no check
1468 if Ekind (E) = E_Enumeration_Literal then
1472 Sbody := Unit_Declaration_Node (E);
1474 if Nkind (Sbody) /= N_Subprogram_Body
1476 Nkind (Sbody) /= N_Package_Body
1478 Ebody := Corresponding_Body (Sbody);
1483 Sbody := Unit_Declaration_Node (Ebody);
1487 -- If the body appears after the outer level call or
1488 -- instantiation then we have an error case handled below.
1490 if Earlier_In_Extended_Unit (Outer_Level_Sloc, Sloc (Sbody))
1491 and then not In_Task_Activation
1495 -- If we have the instantiation case we are done, since we now
1496 -- know that the body of the generic appeared earlier.
1498 elsif Inst_Case then
1501 -- Otherwise we have a call, so we trace through the called
1502 -- body to see if it has any problems ..
1505 pragma Assert (Nkind (Sbody) = N_Subprogram_Body);
1507 Elab_Call.Increment_Last;
1508 Elab_Call.Table (Elab_Call.Last).Cloc := Loc;
1509 Elab_Call.Table (Elab_Call.Last).Ent := E;
1511 if Debug_Flag_LL then
1512 Write_Str ("Elab_Call.Last = ");
1513 Write_Int (Int (Elab_Call.Last));
1514 Write_Str (" Ent = ");
1515 Write_Name (Chars (E));
1517 Write_Location (Sloc (N));
1521 -- Now traverse declarations and statements of subprogram body.
1522 -- Note that we cannot simply Traverse (Sbody), since traverse
1523 -- does not normally visit subprogram bodies.
1526 Decl : Node_Id := First (Declarations (Sbody));
1529 while Present (Decl) loop
1535 Traverse (Handled_Statement_Sequence (Sbody));
1537 Elab_Call.Decrement_Last;
1541 -- Here is the case of calling a subprogram where the body has
1542 -- not yet been encountered, a warning message is needed.
1544 -- If we have nothing in the call stack, then this is at the
1545 -- outer level, and the ABE is bound to occur.
1547 if Elab_Call.Last = 0 then
1550 ("?cannot instantiate& before body seen", N, Orig_Ent);
1553 ("?cannot call& before body seen", N, Orig_Ent);
1557 ("\?Program_Error will be raised at run time", N);
1558 Insert_Elab_Check (N);
1560 -- Call is not at outer level
1563 -- Deal with dynamic elaboration check
1565 if not Elaboration_Checks_Suppressed (E) then
1566 Set_Elaboration_Entity_Required (E);
1568 -- Case of no elaboration entity allocated yet
1570 if No (Elaboration_Entity (E)) then
1572 -- Create object declaration for elaboration entity, and put it
1573 -- just in front of the spec of the subprogram or generic unit,
1574 -- in the same scope as this unit.
1577 Loce : constant Source_Ptr := Sloc (E);
1578 Ent : constant Entity_Id :=
1579 Make_Defining_Identifier (Loc,
1580 Chars => New_External_Name (Chars (E), 'E'));
1583 Set_Elaboration_Entity (E, Ent);
1584 New_Scope (Scope (E));
1586 Insert_Action (Declaration_Node (E),
1587 Make_Object_Declaration (Loce,
1588 Defining_Identifier => Ent,
1589 Object_Definition =>
1590 New_Occurrence_Of (Standard_Boolean, Loce),
1591 Expression => New_Occurrence_Of (Standard_False, Loce)));
1593 -- Set elaboration flag at the point of the body
1595 Set_Elaboration_Flag (Sbody, E);
1597 -- Kill current value indication. This is necessary
1598 -- because the tests of this flag are inserted out of
1599 -- sequence and must not pick up bogus indications of
1600 -- the wrong constant value. Also, this is never a true
1601 -- constant, since one way or another, it gets reset.
1603 Set_Current_Value (Ent, Empty);
1604 Set_Is_True_Constant (Ent, False);
1609 -- Generate check of the elaboration Boolean
1611 Insert_Elab_Check (N,
1612 New_Occurrence_Of (Elaboration_Entity (E), Loc));
1615 -- Generate the warning
1617 if not Suppress_Elaboration_Warnings (E)
1618 and then not Elaboration_Checks_Suppressed (E)
1622 ("instantiation of& may occur before body is seen?",
1626 ("call to& may occur before body is seen?", N, Orig_Ent);
1630 ("\Program_Error may be raised at run time?", N);
1636 -- Set flag to suppress further warnings on same subprogram
1637 -- unless in all errors mode
1639 if not All_Errors_Mode then
1640 Set_Suppress_Elaboration_Warnings (E);
1642 end Check_Internal_Call_Continue;
1644 ---------------------------
1645 -- Check_Task_Activation --
1646 ---------------------------
1648 procedure Check_Task_Activation (N : Node_Id) is
1649 Loc : constant Source_Ptr := Sloc (N);
1650 Inter_Procs : constant Elist_Id := New_Elmt_List;
1651 Intra_Procs : constant Elist_Id := New_Elmt_List;
1654 Task_Scope : Entity_Id;
1655 Cunit_SC : Boolean := False;
1658 Enclosing : Entity_Id;
1660 procedure Add_Task_Proc (Typ : Entity_Id);
1661 -- Add to Task_Procs the task body procedure(s) of task types in Typ.
1662 -- For record types, this procedure recurses over component types.
1664 procedure Collect_Tasks (Decls : List_Id);
1665 -- Collect the types of the tasks that are to be activated in the given
1666 -- list of declarations, in order to perform elaboration checks on the
1667 -- corresponding task procedures which are called implicitly here.
1669 function Outer_Unit (E : Entity_Id) return Entity_Id;
1670 -- find enclosing compilation unit of Entity, ignoring subunits, or
1671 -- else enclosing subprogram. If E is not a package, there is no need
1672 -- for inter-unit elaboration checks.
1678 procedure Add_Task_Proc (Typ : Entity_Id) is
1680 Proc : Entity_Id := Empty;
1683 if Is_Task_Type (Typ) then
1684 Proc := Get_Task_Body_Procedure (Typ);
1686 elsif Is_Array_Type (Typ)
1687 and then Has_Task (Base_Type (Typ))
1689 Add_Task_Proc (Component_Type (Typ));
1691 elsif Is_Record_Type (Typ)
1692 and then Has_Task (Base_Type (Typ))
1694 Comp := First_Component (Typ);
1696 while Present (Comp) loop
1697 Add_Task_Proc (Etype (Comp));
1698 Comp := Next_Component (Comp);
1702 -- If the task type is another unit, we will perform the usual
1703 -- elaboration check on its enclosing unit. If the type is in the
1704 -- same unit, we can trace the task body as for an internal call,
1705 -- but we only need to examine other external calls, because at
1706 -- the point the task is activated, internal subprogram bodies
1707 -- will have been elaborated already. We keep separate lists for
1708 -- each kind of task.
1710 -- Skip this test if errors have occurred, since in this case
1711 -- we can get false indications.
1713 if Serious_Errors_Detected /= 0 then
1717 if Present (Proc) then
1718 if Outer_Unit (Scope (Proc)) = Enclosing then
1720 if No (Corresponding_Body (Unit_Declaration_Node (Proc)))
1722 (not Is_Generic_Instance (Scope (Proc))
1724 Scope (Proc) = Scope (Defining_Identifier (Decl)))
1727 ("task will be activated before elaboration of its body?",
1730 ("Program_Error will be raised at run-time?", Decl);
1733 Present (Corresponding_Body (Unit_Declaration_Node (Proc)))
1735 Append_Elmt (Proc, Intra_Procs);
1739 Elmt := First_Elmt (Inter_Procs);
1741 -- No need for multiple entries of the same type.
1743 while Present (Elmt) loop
1744 if Node (Elmt) = Proc then
1751 Append_Elmt (Proc, Inter_Procs);
1760 procedure Collect_Tasks (Decls : List_Id) is
1762 if Present (Decls) then
1763 Decl := First (Decls);
1765 while Present (Decl) loop
1767 if Nkind (Decl) = N_Object_Declaration
1768 and then Has_Task (Etype (Defining_Identifier (Decl)))
1770 Add_Task_Proc (Etype (Defining_Identifier (Decl)));
1782 function Outer_Unit (E : Entity_Id) return Entity_Id is
1783 Outer : Entity_Id := E;
1786 while Present (Outer) loop
1787 if Elaboration_Checks_Suppressed (Outer) then
1791 exit when Is_Child_Unit (Outer)
1792 or else Scope (Outer) = Standard_Standard
1793 or else Ekind (Outer) /= E_Package;
1794 Outer := Scope (Outer);
1800 -- Start of processing for Check_Task_Activation
1803 Enclosing := Outer_Unit (Current_Scope);
1805 -- Find all tasks declared in the current unit.
1807 if Nkind (N) = N_Package_Body then
1808 P := Unit_Declaration_Node (Corresponding_Spec (N));
1810 Collect_Tasks (Declarations (N));
1811 Collect_Tasks (Visible_Declarations (Specification (P)));
1812 Collect_Tasks (Private_Declarations (Specification (P)));
1814 elsif Nkind (N) = N_Package_Declaration then
1815 Collect_Tasks (Visible_Declarations (Specification (N)));
1816 Collect_Tasks (Private_Declarations (Specification (N)));
1819 Collect_Tasks (Declarations (N));
1822 -- We only perform detailed checks in all tasks are library level
1823 -- entities. If the master is a subprogram or task, activation will
1824 -- depend on the activation of the master itself.
1825 -- Should dynamic checks be added in the more general case???
1827 if Ekind (Enclosing) /= E_Package then
1831 -- For task types defined in other units, we want the unit containing
1832 -- the task body to be elaborated before the current one.
1834 Elmt := First_Elmt (Inter_Procs);
1836 while Present (Elmt) loop
1838 Task_Scope := Outer_Unit (Scope (Ent));
1840 if not Is_Compilation_Unit (Task_Scope) then
1843 elsif Suppress_Elaboration_Warnings (Task_Scope)
1844 or else Elaboration_Checks_Suppressed (Task_Scope)
1848 elsif Dynamic_Elaboration_Checks then
1849 if not Elaboration_Checks_Suppressed (Ent)
1850 and then not Cunit_SC
1851 and then not Restrictions (No_Entry_Calls_In_Elaboration_Code)
1853 -- Runtime elaboration check required. generate check of the
1854 -- elaboration Boolean for the unit containing the entity.
1856 Insert_Elab_Check (N,
1857 Make_Attribute_Reference (Loc,
1858 Attribute_Name => Name_Elaborated,
1861 (Spec_Entity (Task_Scope), Loc)));
1865 -- Force the binder to elaborate other unit first
1867 if not Suppress_Elaboration_Warnings (Ent)
1868 and then not Elaboration_Checks_Suppressed (Ent)
1869 and then Elab_Warnings
1870 and then not Suppress_Elaboration_Warnings (Task_Scope)
1871 and then not Elaboration_Checks_Suppressed (Task_Scope)
1873 Error_Msg_Node_2 := Task_Scope;
1874 Error_Msg_NE ("activation of an instance of task type&" &
1875 " requires pragma Elaborate_All on &?", N, Ent);
1878 Set_Elaborate_All_Desirable (Task_Scope);
1879 Set_Suppress_Elaboration_Warnings (Task_Scope);
1885 -- For tasks declared in the current unit, trace other calls within
1886 -- the task procedure bodies, which are available.
1888 In_Task_Activation := True;
1889 Elmt := First_Elmt (Intra_Procs);
1891 while Present (Elmt) loop
1893 Check_Internal_Call_Continue (N, Ent, Enclosing, Ent);
1897 In_Task_Activation := False;
1898 end Check_Task_Activation;
1900 ----------------------
1901 -- Has_Generic_Body --
1902 ----------------------
1904 function Has_Generic_Body (N : Node_Id) return Boolean is
1905 Ent : constant Entity_Id := Get_Generic_Entity (N);
1906 Decl : constant Node_Id := Unit_Declaration_Node (Ent);
1909 function Find_Body_In (E : Entity_Id; N : Node_Id) return Node_Id;
1910 -- Determine if the list of nodes headed by N and linked by Next
1911 -- contains a package body for the package spec entity E, and if
1912 -- so return the package body. If not, then returns Empty.
1914 function Load_Package_Body (Nam : Unit_Name_Type) return Node_Id;
1915 -- This procedure is called load the unit whose name is given by Nam.
1916 -- This unit is being loaded to see whether it contains an optional
1917 -- generic body. The returned value is the loaded unit, which is
1918 -- always a package body (only package bodies can contain other
1919 -- entities in the sense in which Has_Generic_Body is interested).
1920 -- We only attempt to load bodies if we are generating code. If we
1921 -- are in semantics check only mode, then it would be wrong to load
1922 -- bodies that are not required from a semantic point of view, so
1923 -- in this case we return Empty. The result is that the caller may
1924 -- incorrectly decide that a generic spec does not have a body when
1925 -- in fact it does, but the only harm in this is that some warnings
1926 -- on elaboration problems may be lost in semantic checks only mode,
1927 -- which is not big loss. We also return Empty if we go for a body
1928 -- and it is not there.
1930 function Locate_Corresponding_Body (PE : Entity_Id) return Node_Id;
1931 -- PE is the entity for a package spec. This function locates the
1932 -- corresponding package body, returning Empty if none is found.
1933 -- The package body returned is fully parsed but may not yet be
1934 -- analyzed, so only syntactic fields should be referenced.
1940 function Find_Body_In (E : Entity_Id; N : Node_Id) return Node_Id is
1945 while Present (Nod) loop
1947 -- If we found the package body we are looking for, return it
1949 if Nkind (Nod) = N_Package_Body
1950 and then Chars (Defining_Unit_Name (Nod)) = Chars (E)
1954 -- If we found the stub for the body, go after the subunit,
1955 -- loading it if necessary.
1957 elsif Nkind (Nod) = N_Package_Body_Stub
1958 and then Chars (Defining_Identifier (Nod)) = Chars (E)
1960 if Present (Library_Unit (Nod)) then
1961 return Unit (Library_Unit (Nod));
1964 return Load_Package_Body (Get_Unit_Name (Nod));
1967 -- If neither package body nor stub, keep looking on chain
1977 -----------------------
1978 -- Load_Package_Body --
1979 -----------------------
1981 function Load_Package_Body (Nam : Unit_Name_Type) return Node_Id is
1982 U : Unit_Number_Type;
1985 if Operating_Mode /= Generate_Code then
1998 return Unit (Cunit (U));
2001 end Load_Package_Body;
2003 -------------------------------
2004 -- Locate_Corresponding_Body --
2005 -------------------------------
2007 function Locate_Corresponding_Body (PE : Entity_Id) return Node_Id is
2008 Spec : constant Node_Id := Declaration_Node (PE);
2009 Decl : constant Node_Id := Parent (Spec);
2010 Scop : constant Entity_Id := Scope (PE);
2014 if Is_Library_Level_Entity (PE) then
2016 -- If package is a library unit that requires a body, we have
2017 -- no choice but to go after that body because it might contain
2018 -- an optional body for the original generic package.
2020 if Unit_Requires_Body (PE) then
2022 -- Load the body. Note that we are a little careful here to
2023 -- use Spec to get the unit number, rather than PE or Decl,
2024 -- since in the case where the package is itself a library
2025 -- level instantiation, Spec will properly reference the
2026 -- generic template, which is what we really want.
2030 (Get_Body_Name (Unit_Name (Get_Source_Unit (Spec))));
2032 -- But if the package is a library unit that does NOT require
2033 -- a body, then no body is permitted, so we are sure that there
2034 -- is no body for the original generic package.
2040 -- Otherwise look and see if we are embedded in a further package
2042 elsif Is_Package (Scop) then
2044 -- If so, get the body of the enclosing package, and look in
2045 -- its package body for the package body we are looking for.
2047 PBody := Locate_Corresponding_Body (Scop);
2052 return Find_Body_In (PE, First (Declarations (PBody)));
2055 -- If we are not embedded in a further package, then the body
2056 -- must be in the same declarative part as we are.
2059 return Find_Body_In (PE, Next (Decl));
2061 end Locate_Corresponding_Body;
2063 -- Start of processing for Has_Generic_Body
2066 if Present (Corresponding_Body (Decl)) then
2069 elsif Unit_Requires_Body (Ent) then
2072 -- Compilation units cannot have optional bodies
2074 elsif Is_Compilation_Unit (Ent) then
2077 -- Otherwise look at what scope we are in
2080 Scop := Scope (Ent);
2082 -- Case of entity is in other than a package spec, in this case
2083 -- the body, if present, must be in the same declarative part.
2085 if not Is_Package (Scop) then
2090 P := Declaration_Node (Ent);
2092 -- Declaration node may get us a spec, so if so, go to
2093 -- the parent declaration.
2095 while not Is_List_Member (P) loop
2099 return Present (Find_Body_In (Ent, Next (P)));
2102 -- If the entity is in a package spec, then we have to locate
2103 -- the corresponding package body, and look there.
2107 PBody : constant Node_Id := Locate_Corresponding_Body (Scop);
2115 (Find_Body_In (Ent, (First (Declarations (PBody)))));
2120 end Has_Generic_Body;
2122 -----------------------
2123 -- Insert_Elab_Check --
2124 -----------------------
2126 procedure Insert_Elab_Check (N : Node_Id; C : Node_Id := Empty) is
2128 Loc : constant Source_Ptr := Sloc (N);
2131 -- If expansion is disabled, do not generate any checks. Also
2132 -- skip checks if any subunits are missing because in either
2133 -- case we lack the full information that we need, and no object
2134 -- file will be created in any case.
2136 if not Expander_Active or else Subunits_Missing then
2140 -- If we have a generic instantiation, where Instance_Spec is set,
2141 -- then this field points to a generic instance spec that has
2142 -- been inserted before the instantiation node itself, so that
2143 -- is where we want to insert a check.
2145 if Nkind (N) in N_Generic_Instantiation
2146 and then Present (Instance_Spec (N))
2148 Nod := Instance_Spec (N);
2153 -- If we are inserting at the top level, insert in Aux_Decls
2155 if Nkind (Parent (Nod)) = N_Compilation_Unit then
2157 ADN : constant Node_Id := Aux_Decls_Node (Parent (Nod));
2163 Make_Raise_Program_Error (Loc,
2164 Reason => PE_Access_Before_Elaboration);
2167 Make_Raise_Program_Error (Loc,
2168 Condition => Make_Op_Not (Loc, C),
2169 Reason => PE_Access_Before_Elaboration);
2172 if No (Declarations (ADN)) then
2173 Set_Declarations (ADN, New_List (R));
2175 Append_To (Declarations (ADN), R);
2181 -- Otherwise just insert before the node in question. However, if
2182 -- the context of the call has already been analyzed, an insertion
2183 -- will not work if it depends on subsequent expansion (e.g. a call in
2184 -- a branch of a short-circuit). In that case we replace the call with
2185 -- a conditional expression, or with a Raise if it is unconditional.
2186 -- Unfortunately this does not work if the call has a dynamic size,
2187 -- because gigi regards it as a dynamic-sized temporary. If such a call
2188 -- appears in a short-circuit expression, the elaboration check will be
2189 -- missed (rare enough ???). Otherwise, the code below inserts the check
2190 -- at the appropriate place before the call. Same applies in the even
2191 -- rarer case the return type has a known size but is unconstrained.
2194 if Nkind (N) = N_Function_Call
2195 and then Analyzed (Parent (N))
2196 and then Size_Known_At_Compile_Time (Etype (N))
2198 (not Has_Discriminants (Etype (N))
2199 or else Is_Constrained (Etype (N)))
2203 Typ : constant Entity_Id := Etype (N);
2204 Chk : constant Boolean := Do_Range_Check (N);
2206 R : constant Node_Id :=
2207 Make_Raise_Program_Error (Loc,
2208 Reason => PE_Access_Before_Elaboration);
2218 Make_Conditional_Expression (Loc,
2219 Expressions => New_List (C, Relocate_Node (N), R)));
2222 Analyze_And_Resolve (N, Typ);
2224 -- If the original call requires a range check, so does the
2225 -- conditional expression.
2228 Enable_Range_Check (N);
2230 Set_Do_Range_Check (N, False);
2237 Make_Raise_Program_Error (Loc,
2238 Reason => PE_Access_Before_Elaboration));
2241 Make_Raise_Program_Error (Loc,
2245 Reason => PE_Access_Before_Elaboration));
2249 end Insert_Elab_Check;
2255 procedure Output_Calls (N : Node_Id) is
2258 function Is_Printable_Error_Name (Nm : Name_Id) return Boolean;
2259 -- An internal function, used to determine if a name, Nm, is either
2260 -- a non-internal name, or is an internal name that is printable
2261 -- by the error message circuits (i.e. it has a single upper
2262 -- case letter at the end).
2264 function Is_Printable_Error_Name (Nm : Name_Id) return Boolean is
2266 if not Is_Internal_Name (Nm) then
2269 elsif Name_Len = 1 then
2273 Name_Len := Name_Len - 1;
2274 return not Is_Internal_Name;
2276 end Is_Printable_Error_Name;
2278 -- Start of processing for Output_Calls
2281 for J in reverse 1 .. Elab_Call.Last loop
2282 Error_Msg_Sloc := Elab_Call.Table (J).Cloc;
2284 Ent := Elab_Call.Table (J).Ent;
2286 if Is_Generic_Unit (Ent) then
2287 Error_Msg_NE ("\?& instantiated #", N, Ent);
2289 elsif Is_Init_Proc (Ent) then
2290 Error_Msg_N ("\?initialization procedure called #", N);
2292 elsif Is_Printable_Error_Name (Chars (Ent)) then
2293 Error_Msg_NE ("\?& called #", N, Ent);
2296 Error_Msg_N ("\? called #", N);
2301 ----------------------------
2302 -- Same_Elaboration_Scope --
2303 ----------------------------
2305 function Same_Elaboration_Scope (Scop1, Scop2 : Entity_Id) return Boolean is
2306 S1 : Entity_Id := Scop1;
2307 S2 : Entity_Id := Scop2;
2310 while S1 /= Standard_Standard
2311 and then (Ekind (S1) = E_Package
2313 Ekind (S1) = E_Block)
2318 while S2 /= Standard_Standard
2319 and then (Ekind (S2) = E_Package
2321 Ekind (S2) = E_Protected_Type
2323 Ekind (S2) = E_Block)
2329 end Same_Elaboration_Scope;
2335 procedure Set_C_Scope is
2337 while not Is_Compilation_Unit (C_Scope) loop
2338 C_Scope := Scope (C_Scope);
2346 function Spec_Entity (E : Entity_Id) return Entity_Id is
2350 -- Check for case of body entity
2351 -- Why is the check for E_Void needed???
2353 if Ekind (E) = E_Void
2354 or else Ekind (E) = E_Subprogram_Body
2355 or else Ekind (E) = E_Package_Body
2360 Decl := Parent (Decl);
2361 exit when Nkind (Decl) in N_Proper_Body;
2364 return Corresponding_Spec (Decl);
2375 procedure Supply_Bodies (N : Node_Id) is
2377 if Nkind (N) = N_Subprogram_Declaration then
2379 Ent : constant Entity_Id := Defining_Unit_Name (Specification (N));
2382 Set_Is_Imported (Ent);
2383 Set_Convention (Ent, Convention_Stubbed);
2386 elsif Nkind (N) = N_Package_Declaration then
2388 Spec : constant Node_Id := Specification (N);
2391 New_Scope (Defining_Unit_Name (Spec));
2392 Supply_Bodies (Visible_Declarations (Spec));
2393 Supply_Bodies (Private_Declarations (Spec));
2399 procedure Supply_Bodies (L : List_Id) is
2405 while Present (Elmt) loop
2406 Supply_Bodies (Elmt);
2416 function Within (E1, E2 : Entity_Id) return Boolean is
2426 elsif Scop = Standard_Standard then
2430 Scop := Scope (Scop);
2434 raise Program_Error;
2437 --------------------------
2438 -- Within_Elaborate_All --
2439 --------------------------
2441 function Within_Elaborate_All (E : Entity_Id) return Boolean is
2444 Elab_Id : Entity_Id;
2448 Item := First (Context_Items (Cunit (Current_Sem_Unit)));
2450 while Present (Item) loop
2451 if Nkind (Item) = N_Pragma
2452 and then Get_Pragma_Id (Chars (Item)) = Pragma_Elaborate_All
2454 if Error_Posted (Item) then
2456 -- Some previous error on the pragma itself
2463 Expression (First (Pragma_Argument_Associations (Item))));
2465 Par := Parent (Unit_Declaration_Node (Elab_Id));
2466 Item2 := First (Context_Items (Par));
2468 while Present (Item2) loop
2469 if Nkind (Item2) = N_With_Clause
2470 and then Entity (Name (Item2)) = E
2483 end Within_Elaborate_All;