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 -- If the call is known to be within a local Suppress Elaboration
329 -- pragma, nothing to check. This can happen in task bodies.
331 if (Nkind (N) = N_Function_Call
332 or else Nkind (N) = N_Procedure_Call_Statement)
333 and then No_Elaboration_Check (N)
338 -- Go to parent for derived subprogram, or to original subprogram
339 -- in the case of a renaming (Alias covers both these cases)
343 if (Suppress_Elaboration_Warnings (Ent)
344 or else Elaboration_Checks_Suppressed (Ent))
345 and then (Inst_Case or else No (Alias (Ent)))
350 -- Nothing to do for imported entities,
352 if Is_Imported (Ent) then
356 exit when Inst_Case or else No (Alias (Ent));
360 Decl := Unit_Declaration_Node (Ent);
362 if Nkind (Decl) = N_Subprogram_Body then
363 Body_Acts_As_Spec := True;
365 elsif Nkind (Decl) = N_Subprogram_Declaration
366 or else Nkind (Decl) = N_Subprogram_Body_Stub
369 Body_Acts_As_Spec := False;
371 -- If we have none of an instantiation, subprogram body or
372 -- subprogram declaration, then it is not a case that we want
373 -- to check. (One case is a call to a generic formal subprogram,
374 -- where we do not want the check in the template).
382 if Elaboration_Checks_Suppressed (E_Scope)
383 or else Suppress_Elaboration_Warnings (E_Scope)
388 -- Exit when we get to compilation unit, not counting subunits
390 exit when Is_Compilation_Unit (E_Scope)
391 and then (Is_Child_Unit (E_Scope)
392 or else Scope (E_Scope) = Standard_Standard);
394 -- If we did not find a compilation unit, other than standard,
395 -- then nothing to check (happens in some instantiation cases)
397 if E_Scope = Standard_Standard then
400 -- Otherwise move up a scope looking for compilation unit
403 E_Scope := Scope (E_Scope);
407 -- No checks needed for pure or preelaborated compilation units
410 or else Is_Preelaborated (E_Scope)
415 -- If the generic entity is within a deeper instance than we are, then
416 -- either the instantiation to which we refer itself caused an ABE, in
417 -- which case that will be handled separately. Otherwise, we know that
418 -- the body we need appears as needed at the point of the instantiation.
419 -- However, this assumption is only valid if we are in static mode.
421 if not Dynamic_Elaboration_Checks
422 and then Instantiation_Depth (Sloc (Ent)) >
423 Instantiation_Depth (Sloc (N))
428 -- Do not give a warning for a package with no body
430 if Ekind (Ent) = E_Generic_Package
431 and then not Has_Generic_Body (N)
436 -- Case of entity is not in current unit (i.e. with'ed unit case)
438 if E_Scope /= C_Scope then
440 -- We are only interested in such calls if the outer call was from
441 -- elaboration code, or if we are in Dynamic_Elaboration_Checks mode.
443 if not From_Elab_Code and then not Dynamic_Elaboration_Checks then
447 -- Nothing to do if some scope said that no checks were required
453 -- Nothing to do for a generic instance, because in this case
454 -- the checking was at the point of instantiation of the generic
455 -- However, this shortcut is only applicable in static mode.
457 if Is_Generic_Instance (Ent) and not Dynamic_Elaboration_Checks then
461 -- Nothing to do if subprogram with no separate spec. However,
462 -- a call to Deep_Initialize may result in a call to a user-defined
463 -- Initialize procedure, which imposes a body dependency. This
464 -- happens only if the type is controlled and the Initialize
465 -- procedure is not inherited.
467 if Body_Acts_As_Spec then
468 if Is_TSS (Ent, TSS_Deep_Initialize) then
473 Typ := Etype (Next_Formal (First_Formal (Ent)));
475 if not Is_Controlled (Typ) then
478 Init := Find_Prim_Op (Typ, Name_Initialize);
480 if Comes_From_Source (Init) then
493 -- Check cases of internal units
495 Callee_Unit_Internal :=
496 Is_Internal_File_Name
497 (Unit_File_Name (Get_Source_Unit (E_Scope)));
499 -- Do not give a warning if the with'ed unit is internal
500 -- and this is the generic instantiation case (this saves a
501 -- lot of hassle dealing with the Text_IO special child units)
503 if Callee_Unit_Internal and Inst_Case then
507 if C_Scope = Standard_Standard then
508 Caller_Unit_Internal := False;
510 Caller_Unit_Internal :=
511 Is_Internal_File_Name
512 (Unit_File_Name (Get_Source_Unit (C_Scope)));
515 -- Do not give a warning if the with'ed unit is internal
516 -- and the caller is not internal (since the binder always
517 -- elaborates internal units first).
519 if Callee_Unit_Internal and (not Caller_Unit_Internal) then
523 -- For now, if debug flag -gnatdE is not set, do no checking for
524 -- one internal unit withing another. This fixes the problem with
525 -- the sgi build and storage errors. To be resolved later ???
527 if (Callee_Unit_Internal and Caller_Unit_Internal)
528 and then not Debug_Flag_EE
533 if Is_TSS (E, TSS_Deep_Initialize) then
537 -- If the call is in an instance, and the called entity is not
538 -- defined in the same instance, then the elaboration issue
539 -- focuses around the unit containing the template, it is
540 -- this unit which requires an Elaborate_All.
542 -- However, if we are doing dynamic elaboration, we need to
543 -- chase the call in the usual manner.
545 -- We do not handle the case of calling a generic formal correctly
546 -- in the static case. See test 4703-004 to explore this gap ???
548 Inst_Caller := Instantiation (Get_Source_File_Index (Sloc (N)));
549 Inst_Callee := Instantiation (Get_Source_File_Index (Sloc (Ent)));
551 if Inst_Caller = No_Location then
552 Unit_Caller := No_Unit;
554 Unit_Caller := Get_Source_Unit (N);
557 if Inst_Callee = No_Location then
558 Unit_Callee := No_Unit;
560 Unit_Callee := Get_Source_Unit (Ent);
563 if Unit_Caller /= No_Unit
564 and then Unit_Callee /= Unit_Caller
565 and then not Dynamic_Elaboration_Checks
567 E_Scope := Spec_Entity (Cunit_Entity (Unit_Caller));
569 -- If we don't get a spec entity, just ignore call. Not
570 -- quite clear why this check is necessary.
576 -- Otherwise step to enclosing compilation unit
578 while not Is_Compilation_Unit (E_Scope) loop
579 E_Scope := Scope (E_Scope);
582 -- For the case N is not an instance, or a call within instance
583 -- We recompute E_Scope for the error message, since we
584 -- do NOT want to go to the unit which has the ultimate
585 -- declaration in the case of renaming and derivation and
586 -- we also want to go to the generic unit in the case of
587 -- an instance, and no further.
590 -- Loop to carefully follow renamings and derivations
591 -- one step outside the current unit, but not further.
594 and then Present (Alias (Ent))
596 E_Scope := Alias (Ent);
602 while not Is_Compilation_Unit (E_Scope) loop
603 E_Scope := Scope (E_Scope);
606 -- If E_Scope is the same as C_Scope, it means that there
607 -- definitely was a local renaming or derivation, and we
608 -- are not yet out of the current unit.
610 exit when E_Scope /= C_Scope;
614 -- If no alias, there is a previous error.
622 if Within_Elaborate_All (E_Scope) then
626 if not Suppress_Elaboration_Warnings (Ent)
627 and then not Elaboration_Checks_Suppressed (Ent)
628 and then not Suppress_Elaboration_Warnings (E_Scope)
629 and then not Elaboration_Checks_Suppressed (E_Scope)
630 and then Elab_Warnings
631 and then Generate_Warnings
635 ("instantiation of& may raise Program_Error?", N, Ent);
637 if Is_Init_Proc (Entity (Name (N)))
638 and then Comes_From_Source (Ent)
641 ("implicit call to & in initialization" &
642 " may raise Program_Error?", N, Ent);
643 E_Scope := Scope (Entity (Name (N)));
647 ("call to & may raise Program_Error?", N, Ent);
650 if Unit_Callee = No_Unit
651 and then E_Scope = Current_Scope
653 -- The missing pragma cannot be on the current unit, so
654 -- place it on the compilation unit that contains the
655 -- called entity, which is more likely to be right.
659 while not Is_Compilation_Unit (E_Scope) loop
660 E_Scope := Scope (E_Scope);
665 Error_Msg_Qual_Level := Nat'Last;
667 ("\missing pragma Elaborate_All for&?", N, E_Scope);
668 Error_Msg_Qual_Level := 0;
671 -- Set flag to prevent further warnings for same unit
672 -- unless in All_Errors_Mode.
674 if not All_Errors_Mode and not Dynamic_Elaboration_Checks then
675 Set_Suppress_Elaboration_Warnings (E_Scope, True);
679 -- Check for runtime elaboration check required
681 if Dynamic_Elaboration_Checks then
682 if not Elaboration_Checks_Suppressed (Ent)
683 and then not Elaboration_Checks_Suppressed (E_Scope)
684 and then not Cunit_SC
686 -- Runtime elaboration check required. Generate check of the
687 -- elaboration Boolean for the unit containing the entity.
689 Insert_Elab_Check (N,
690 Make_Attribute_Reference (Loc,
691 Attribute_Name => Name_Elaborated,
694 (Spec_Entity (E_Scope), Loc)));
697 -- If no dynamic check required, then ask binder to guarantee
698 -- that the necessary elaborations will be done properly!
701 if not Suppress_Elaboration_Warnings (E)
702 and then not Elaboration_Checks_Suppressed (E)
703 and then not Suppress_Elaboration_Warnings (E_Scope)
704 and then not Elaboration_Checks_Suppressed (E_Scope)
705 and then Elab_Warnings
706 and then Generate_Warnings
707 and then not Inst_Case
709 Error_Msg_Node_2 := E_Scope;
710 Error_Msg_NE ("call to& in elaboration code " &
711 "requires pragma Elaborate_All on&?", N, E);
714 Set_Elaborate_All_Desirable (E_Scope);
715 Set_Suppress_Elaboration_Warnings (E_Scope, True);
718 -- Case of entity is in same unit as call or instantiation
720 elsif not Inter_Unit_Only then
721 Check_Internal_Call (N, Ent, Outer_Scope, E);
725 -----------------------------
726 -- Check_Bad_Instantiation --
727 -----------------------------
729 procedure Check_Bad_Instantiation (N : Node_Id) is
733 -- Nothing to do if we do not have an instantiation (happens in some
734 -- error cases, and also in the formal package declaration case)
736 if Nkind (N) not in N_Generic_Instantiation then
739 -- Nothing to do if serious errors detected (avoid cascaded errors)
741 elsif Serious_Errors_Detected /= 0 then
744 -- Nothing to do if not in full analysis mode
746 elsif not Full_Analysis then
749 -- Nothing to do if inside a generic template
751 elsif Inside_A_Generic then
754 -- Nothing to do if a library level instantiation
756 elsif Nkind (Parent (N)) = N_Compilation_Unit then
759 -- Nothing to do if we are compiling a proper body for semantic
760 -- purposes only. The generic body may be in another proper body.
763 Nkind (Parent (Unit_Declaration_Node (Main_Unit_Entity))) = N_Subunit
768 Ent := Get_Generic_Entity (N);
770 -- The case we are interested in is when the generic spec is in the
771 -- current declarative part
773 if not Same_Elaboration_Scope (Current_Scope, Scope (Ent))
774 or else not In_Same_Extended_Unit (Sloc (N), Sloc (Ent))
779 -- If the generic entity is within a deeper instance than we are, then
780 -- either the instantiation to which we refer itself caused an ABE, in
781 -- which case that will be handled separately. Otherwise, we know that
782 -- the body we need appears as needed at the point of the instantiation.
783 -- If they are both at the same level but not within the same instance
784 -- then the body of the generic will be in the earlier instance.
787 D1 : constant Int := Instantiation_Depth (Sloc (Ent));
788 D2 : constant Int := Instantiation_Depth (Sloc (N));
795 and then Is_Generic_Instance (Scope (Ent))
796 and then not In_Open_Scopes (Scope (Ent))
802 -- Now we can proceed, if the entity being called has a completion,
803 -- then we are definitely OK, since we have already seen the body.
805 if Has_Completion (Ent) then
809 -- If there is no body, then nothing to do
811 if not Has_Generic_Body (N) then
815 -- Here we definitely have a bad instantiation
818 ("?cannot instantiate& before body seen", N, Ent);
820 if Present (Instance_Spec (N)) then
821 Supply_Bodies (Instance_Spec (N));
825 ("\?Program_Error will be raised at run time", N);
826 Insert_Elab_Check (N);
827 Set_ABE_Is_Certain (N);
829 end Check_Bad_Instantiation;
831 ---------------------
832 -- Check_Elab_Call --
833 ---------------------
835 procedure Check_Elab_Call
837 Outer_Scope : Entity_Id := Empty)
842 function Get_Called_Ent return Entity_Id;
843 -- Retrieve called entity. If this is a call to a protected subprogram,
844 -- entity is a selected component. The callable entity may be absent,
845 -- in which case there is no check to perform. This happens with
846 -- non-analyzed calls in nested generics.
852 function Get_Called_Ent return Entity_Id is
861 elsif Nkind (Nam) = N_Selected_Component then
862 return Entity (Selector_Name (Nam));
864 elsif not Is_Entity_Name (Nam) then
872 -- Start of processing for Check_Elab_Call
875 -- For an entry call, check relevant restriction
877 if Nkind (N) = N_Entry_Call_Statement
878 and then not In_Subprogram_Or_Concurrent_Unit
880 Check_Restriction (No_Entry_Calls_In_Elaboration_Code, N);
882 -- Nothing to do if this is not a call (happens in some error
883 -- conditions, and in some cases where rewriting occurs).
885 elsif Nkind (N) /= N_Function_Call
886 and then Nkind (N) /= N_Procedure_Call_Statement
890 -- Nothing to do if this is a call already rewritten for elab checking.
892 elsif Nkind (Parent (N)) = N_Conditional_Expression then
895 -- Nothing to do if inside a generic template
897 elsif Inside_A_Generic
898 and then not Present (Enclosing_Generic_Body (N))
903 -- Here we have a call at elaboration time which must be checked
905 if Debug_Flag_LL then
906 Write_Str (" Check_Elab_Call: ");
909 or else not Is_Entity_Name (Name (N))
911 Write_Str ("<<not entity name>> ");
913 Write_Name (Chars (Entity (Name (N))));
916 Write_Str (" call at ");
917 Write_Location (Sloc (N));
921 -- Climb up the tree to make sure we are not inside a
922 -- default expression of a parameter specification or
923 -- a record component, since in both these cases, we
924 -- will be doing the actual call later, not now, and it
925 -- is at the time of the actual call (statically speaking)
926 -- that we must do our static check, not at the time of
927 -- its initial analysis).
930 while Present (P) loop
931 if Nkind (P) = N_Parameter_Specification
933 Nkind (P) = N_Component_Declaration
941 -- Stuff that happens only at the outer level
943 if No (Outer_Scope) then
944 Elab_Visited.Set_Last (0);
946 -- Nothing to do if current scope is Standard (this is a bit
947 -- odd, but it happens in the case of generic instantiations).
949 C_Scope := Current_Scope;
951 if C_Scope = Standard_Standard then
955 -- First case, we are in elaboration code
957 From_Elab_Code := not In_Subprogram_Or_Concurrent_Unit;
958 if From_Elab_Code then
960 -- Complain if call that comes from source in preelaborated
961 -- unit and we are not inside a subprogram (i.e. we are in
964 if Comes_From_Source (N)
965 and then In_Preelaborated_Unit
966 and then not In_Inlined_Body
969 ("non-static call not allowed in preelaborated unit", N);
973 -- Second case, we are inside a subprogram or concurrent unit
974 -- i.e, we are not in elaboration code.
977 -- In this case, the issue is whether we are inside the
978 -- declarative part of the unit in which we live, or inside
979 -- its statements. In the latter case, there is no issue of
980 -- ABE calls at this level (a call from outside to the unit
981 -- in which we live might cause an ABE, but that will be
982 -- detected when we analyze that outer level call, as it
983 -- recurses into the called unit).
985 -- Climb up the tree, doing this test, and also testing
986 -- for being inside a default expression, which, as
987 -- discussed above, is not checked at this stage.
996 -- If we find a parentless subtree, it seems safe to
997 -- assume that we are not in a declarative part and
998 -- that no checking is required.
1004 if Is_List_Member (P) then
1005 L := List_Containing (P);
1012 exit when Nkind (P) = N_Subunit;
1014 -- Filter out case of default expressions, where
1015 -- we do not do the check at this stage.
1017 if Nkind (P) = N_Parameter_Specification
1019 Nkind (P) = N_Component_Declaration
1024 if Nkind (P) = N_Subprogram_Body
1026 Nkind (P) = N_Protected_Body
1028 Nkind (P) = N_Task_Body
1030 Nkind (P) = N_Block_Statement
1032 if L = Declarations (P) then
1035 -- We are not in elaboration code, but we are doing
1036 -- dynamic elaboration checks, in this case, we still
1037 -- need to do the call, since the subprogram we are in
1038 -- could be called from another unit, also in dynamic
1039 -- elaboration check mode, at elaboration time.
1041 elsif Dynamic_Elaboration_Checks then
1043 -- This is a rather new check, going into version
1044 -- 3.14a1 for the first time (V1.80 of this unit),
1045 -- so we provide a debug flag to enable it. That
1046 -- way we have an easy work around for regressions
1047 -- that are caused by this new check. This debug
1048 -- flag can be removed later.
1050 if Debug_Flag_DD then
1054 -- Do the check in this case
1058 elsif Nkind (P) = N_Task_Body then
1060 -- The check is deferred until Check_Task_Activation
1061 -- but we need to capture local suppress pragmas
1062 -- that may inhibit checks on this call.
1064 Ent := Get_Called_Ent;
1069 elsif Elaboration_Checks_Suppressed (Current_Scope)
1070 or else Elaboration_Checks_Suppressed (Ent)
1071 or else Elaboration_Checks_Suppressed (Scope (Ent))
1073 Set_No_Elaboration_Check (N);
1078 -- Static model, call is not in elaboration code, we
1079 -- never need to worry, because in the static model
1080 -- the top level caller always takes care of things.
1091 Ent := Get_Called_Ent;
1097 -- Nothing to do if this is a recursive call (i.e. a call to
1098 -- an entity that is already in the Elab_Call stack)
1100 for J in 1 .. Elab_Visited.Last loop
1101 if Ent = Elab_Visited.Table (J) then
1106 -- See if we need to analyze this call. We analyze it if either of
1107 -- the following conditions is met:
1109 -- It is an inner level call (since in this case it was triggered
1110 -- by an outer level call from elaboration code), but only if the
1111 -- call is within the scope of the original outer level call.
1113 -- It is an outer level call from elaboration code, or the called
1114 -- entity is in the same elaboration scope.
1116 -- And in these cases, we will check both inter-unit calls and
1117 -- intra-unit (within a single unit) calls.
1119 C_Scope := Current_Scope;
1121 -- If not outer level call, then we follow it if it is within
1122 -- the original scope of the outer call.
1124 if Present (Outer_Scope)
1125 and then Within (Scope (Ent), Outer_Scope)
1128 Check_A_Call (N, Ent, Outer_Scope, Inter_Unit_Only => False);
1130 elsif Elaboration_Checks_Suppressed (Current_Scope) then
1133 elsif From_Elab_Code then
1135 Check_A_Call (N, Ent, Standard_Standard, Inter_Unit_Only => False);
1137 elsif Same_Elaboration_Scope (C_Scope, Scope (Ent)) then
1139 Check_A_Call (N, Ent, Scope (Ent), Inter_Unit_Only => False);
1141 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode
1142 -- is set, then we will do the check, but only in the inter-unit case
1143 -- (this is to accommodate unguarded elaboration calls from other units
1144 -- in which this same mode is set). We don't want warnings in this case,
1145 -- it would generate warnings having nothing to do with elaboration.
1147 elsif Dynamic_Elaboration_Checks then
1153 Inter_Unit_Only => True,
1154 Generate_Warnings => False);
1156 -- Otherwise nothing to do
1162 -- A call to an Init_Proc in elaboration code may bring additional
1163 -- dependencies, if some of the record components thereof have
1164 -- initializations that are function calls that come from source.
1165 -- We treat the current node as a call to each of these functions,
1166 -- to check their elaboration impact.
1168 if Is_Init_Proc (Ent)
1169 and then From_Elab_Code
1171 Process_Init_Proc : declare
1172 Unit_Decl : constant Node_Id := Unit_Declaration_Node (Ent);
1174 function Process (Nod : Node_Id) return Traverse_Result;
1175 -- Find subprogram calls within body of init_proc for
1176 -- Traverse instantiation below.
1178 function Process (Nod : Node_Id) return Traverse_Result is
1182 if (Nkind (Nod) = N_Function_Call
1183 or else Nkind (Nod) = N_Procedure_Call_Statement)
1184 and then Is_Entity_Name (Name (Nod))
1186 Func := Entity (Name (Nod));
1188 if Comes_From_Source (Func) then
1190 (N, Func, Standard_Standard, Inter_Unit_Only => True);
1200 procedure Traverse_Body is new Traverse_Proc (Process);
1202 -- Start of processing for Process_Init_Proc
1205 if Nkind (Unit_Decl) = N_Subprogram_Body then
1206 Traverse_Body (Handled_Statement_Sequence (Unit_Decl));
1208 end Process_Init_Proc;
1210 end Check_Elab_Call;
1212 ----------------------
1213 -- Check_Elab_Calls --
1214 ----------------------
1216 procedure Check_Elab_Calls is
1218 -- If expansion is disabled, do not generate any checks. Also
1219 -- skip checks if any subunits are missing because in either
1220 -- case we lack the full information that we need, and no object
1221 -- file will be created in any case.
1223 if not Expander_Active
1224 or else Is_Generic_Unit (Cunit_Entity (Main_Unit))
1225 or else Subunits_Missing
1230 -- Skip delayed calls if we had any errors
1232 if Serious_Errors_Detected = 0 then
1233 Delaying_Elab_Checks := False;
1234 Expander_Mode_Save_And_Set (True);
1236 for J in Delay_Check.First .. Delay_Check.Last loop
1237 New_Scope (Delay_Check.Table (J).Curscop);
1238 From_Elab_Code := Delay_Check.Table (J).From_Elab_Code;
1240 Check_Internal_Call_Continue (
1241 N => Delay_Check.Table (J).N,
1242 E => Delay_Check.Table (J).E,
1243 Outer_Scope => Delay_Check.Table (J).Outer_Scope,
1244 Orig_Ent => Delay_Check.Table (J).Orig_Ent);
1249 -- Set Delaying_Elab_Checks back on for next main compilation
1251 Expander_Mode_Restore;
1252 Delaying_Elab_Checks := True;
1254 end Check_Elab_Calls;
1256 ------------------------------
1257 -- Check_Elab_Instantiation --
1258 ------------------------------
1260 procedure Check_Elab_Instantiation
1262 Outer_Scope : Entity_Id := Empty)
1267 -- Check for and deal with bad instantiation case. There is some
1268 -- duplicated code here, but we will worry about this later ???
1270 Check_Bad_Instantiation (N);
1272 if ABE_Is_Certain (N) then
1276 -- Nothing to do if we do not have an instantiation (happens in some
1277 -- error cases, and also in the formal package declaration case)
1279 if Nkind (N) not in N_Generic_Instantiation then
1283 -- Nothing to do if inside a generic template
1285 if Inside_A_Generic then
1289 Ent := Get_Generic_Entity (N);
1290 From_Elab_Code := not In_Subprogram_Or_Concurrent_Unit;
1292 -- See if we need to analyze this instantiation. We analyze it if
1293 -- either of the following conditions is met:
1295 -- It is an inner level instantiation (since in this case it was
1296 -- triggered by an outer level call from elaboration code), but
1297 -- only if the instantiation is within the scope of the original
1298 -- outer level call.
1300 -- It is an outer level instantiation from elaboration code, or the
1301 -- instantiated entity is in the same elaboratoin scope.
1303 -- And in these cases, we will check both the inter-unit case and
1304 -- the intra-unit (within a single unit) case.
1306 C_Scope := Current_Scope;
1308 if Present (Outer_Scope)
1309 and then Within (Scope (Ent), Outer_Scope)
1312 Check_A_Call (N, Ent, Outer_Scope, Inter_Unit_Only => False);
1314 elsif From_Elab_Code then
1316 Check_A_Call (N, Ent, Standard_Standard, Inter_Unit_Only => False);
1318 elsif Same_Elaboration_Scope (C_Scope, Scope (Ent)) then
1320 Check_A_Call (N, Ent, Scope (Ent), Inter_Unit_Only => False);
1322 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode
1323 -- is set, then we will do the check, but only in the inter-unit case
1324 -- (this is to accommodate unguarded elaboration calls from other units
1325 -- in which this same mode is set). We inhibit warnings in this case,
1326 -- since this instantiation is not occurring in elaboration code.
1328 elsif Dynamic_Elaboration_Checks then
1334 Inter_Unit_Only => True,
1335 Generate_Warnings => False);
1340 end Check_Elab_Instantiation;
1342 -------------------------
1343 -- Check_Internal_Call --
1344 -------------------------
1346 procedure Check_Internal_Call
1349 Outer_Scope : Entity_Id;
1350 Orig_Ent : Entity_Id)
1352 Inst_Case : constant Boolean := Nkind (N) in N_Generic_Instantiation;
1355 -- If not function or procedure call or instantiation, then ignore
1356 -- call (this happens in some error case and rewriting cases)
1358 if Nkind (N) /= N_Function_Call
1360 Nkind (N) /= N_Procedure_Call_Statement
1366 -- Nothing to do if this is a call or instantiation that has
1367 -- already been found to be a sure ABE
1369 elsif ABE_Is_Certain (N) then
1372 -- Nothing to do if errors already detected (avoid cascaded errors)
1374 elsif Serious_Errors_Detected /= 0 then
1377 -- Nothing to do if not in full analysis mode
1379 elsif not Full_Analysis then
1382 -- Nothing to do if within a default expression, since the call
1383 -- is not actualy being made at this time.
1385 elsif In_Default_Expression then
1388 -- Nothing to do for call to intrinsic subprogram
1390 elsif Is_Intrinsic_Subprogram (E) then
1393 -- No need to trace local calls if checking task activation, because
1394 -- other local bodies are elaborated already.
1396 elsif In_Task_Activation then
1400 -- Delay this call if we are still delaying calls
1402 if Delaying_Elab_Checks then
1403 Delay_Check.Increment_Last;
1404 Delay_Check.Table (Delay_Check.Last) :=
1407 Orig_Ent => Orig_Ent,
1408 Curscop => Current_Scope,
1409 Outer_Scope => Outer_Scope,
1410 From_Elab_Code => From_Elab_Code);
1413 -- Otherwise, call phase 2 continuation right now
1416 Check_Internal_Call_Continue (N, E, Outer_Scope, Orig_Ent);
1419 end Check_Internal_Call;
1421 ----------------------------------
1422 -- Check_Internal_Call_Continue --
1423 ----------------------------------
1425 procedure Check_Internal_Call_Continue
1428 Outer_Scope : Entity_Id;
1429 Orig_Ent : Entity_Id)
1431 Loc : constant Source_Ptr := Sloc (N);
1432 Inst_Case : constant Boolean := Is_Generic_Unit (E);
1437 function Process (N : Node_Id) return Traverse_Result;
1438 -- Function applied to each node as we traverse the body.
1439 -- Checks for call that needs checking, and if so checks
1440 -- it. Always returns OK, so entire tree is traversed.
1446 function Process (N : Node_Id) return Traverse_Result is
1448 -- If user has specified that there are no entry calls in elaboration
1449 -- code, do not trace past an accept statement, because the rendez-
1450 -- vous will happen after elaboration.
1452 if (Nkind (Original_Node (N)) = N_Accept_Statement
1453 or else Nkind (Original_Node (N)) = N_Selective_Accept)
1454 and then Restrictions (No_Entry_Calls_In_Elaboration_Code)
1458 -- If we have a subprogram call, check it
1460 elsif Nkind (N) = N_Function_Call
1461 or else Nkind (N) = N_Procedure_Call_Statement
1463 Check_Elab_Call (N, Outer_Scope);
1466 -- If we have a generic instantiation, check it
1468 elsif Nkind (N) in N_Generic_Instantiation then
1469 Check_Elab_Instantiation (N, Outer_Scope);
1472 -- Skip subprogram bodies that come from source (wait for
1473 -- call to analyze these). The reason for the come from
1474 -- source test is to avoid catching task bodies.
1476 -- For task bodies, we should really avoid these too, waiting
1477 -- for the task activation, but that's too much trouble to
1478 -- catch for now, so we go in unconditionally. This is not
1479 -- so terrible, it means the error backtrace is not quite
1480 -- complete, and we are too eager to scan bodies of tasks
1481 -- that are unused, but this is hardly very significant!
1483 elsif Nkind (N) = N_Subprogram_Body
1484 and then Comes_From_Source (N)
1493 procedure Traverse is new Atree.Traverse_Proc;
1494 -- Traverse procedure using above Process function
1496 -- Start of processing for Check_Internal_Call_Continue
1499 -- Save outer level call if at outer level
1501 if Elab_Call.Last = 0 then
1502 Outer_Level_Sloc := Loc;
1505 Elab_Visited.Increment_Last;
1506 Elab_Visited.Table (Elab_Visited.Last) := E;
1508 -- If the call is to a function that renames a literal, no check
1511 if Ekind (E) = E_Enumeration_Literal then
1515 Sbody := Unit_Declaration_Node (E);
1517 if Nkind (Sbody) /= N_Subprogram_Body
1519 Nkind (Sbody) /= N_Package_Body
1521 Ebody := Corresponding_Body (Sbody);
1526 Sbody := Unit_Declaration_Node (Ebody);
1530 -- If the body appears after the outer level call or
1531 -- instantiation then we have an error case handled below.
1533 if Earlier_In_Extended_Unit (Outer_Level_Sloc, Sloc (Sbody))
1534 and then not In_Task_Activation
1538 -- If we have the instantiation case we are done, since we now
1539 -- know that the body of the generic appeared earlier.
1541 elsif Inst_Case then
1544 -- Otherwise we have a call, so we trace through the called
1545 -- body to see if it has any problems ..
1548 pragma Assert (Nkind (Sbody) = N_Subprogram_Body);
1550 Elab_Call.Increment_Last;
1551 Elab_Call.Table (Elab_Call.Last).Cloc := Loc;
1552 Elab_Call.Table (Elab_Call.Last).Ent := E;
1554 if Debug_Flag_LL then
1555 Write_Str ("Elab_Call.Last = ");
1556 Write_Int (Int (Elab_Call.Last));
1557 Write_Str (" Ent = ");
1558 Write_Name (Chars (E));
1560 Write_Location (Sloc (N));
1564 -- Now traverse declarations and statements of subprogram body.
1565 -- Note that we cannot simply Traverse (Sbody), since traverse
1566 -- does not normally visit subprogram bodies.
1569 Decl : Node_Id := First (Declarations (Sbody));
1572 while Present (Decl) loop
1578 Traverse (Handled_Statement_Sequence (Sbody));
1580 Elab_Call.Decrement_Last;
1584 -- Here is the case of calling a subprogram where the body has
1585 -- not yet been encountered, a warning message is needed.
1587 -- If we have nothing in the call stack, then this is at the
1588 -- outer level, and the ABE is bound to occur.
1590 if Elab_Call.Last = 0 then
1593 ("?cannot instantiate& before body seen", N, Orig_Ent);
1596 ("?cannot call& before body seen", N, Orig_Ent);
1600 ("\?Program_Error will be raised at run time", N);
1601 Insert_Elab_Check (N);
1603 -- Call is not at outer level
1606 -- Deal with dynamic elaboration check
1608 if not Elaboration_Checks_Suppressed (E) then
1609 Set_Elaboration_Entity_Required (E);
1611 -- Case of no elaboration entity allocated yet
1613 if No (Elaboration_Entity (E)) then
1615 -- Create object declaration for elaboration entity, and put it
1616 -- just in front of the spec of the subprogram or generic unit,
1617 -- in the same scope as this unit.
1620 Loce : constant Source_Ptr := Sloc (E);
1621 Ent : constant Entity_Id :=
1622 Make_Defining_Identifier (Loc,
1623 Chars => New_External_Name (Chars (E), 'E'));
1626 Set_Elaboration_Entity (E, Ent);
1627 New_Scope (Scope (E));
1629 Insert_Action (Declaration_Node (E),
1630 Make_Object_Declaration (Loce,
1631 Defining_Identifier => Ent,
1632 Object_Definition =>
1633 New_Occurrence_Of (Standard_Boolean, Loce),
1634 Expression => New_Occurrence_Of (Standard_False, Loce)));
1636 -- Set elaboration flag at the point of the body
1638 Set_Elaboration_Flag (Sbody, E);
1640 -- Kill current value indication. This is necessary
1641 -- because the tests of this flag are inserted out of
1642 -- sequence and must not pick up bogus indications of
1643 -- the wrong constant value. Also, this is never a true
1644 -- constant, since one way or another, it gets reset.
1646 Set_Current_Value (Ent, Empty);
1647 Set_Is_True_Constant (Ent, False);
1652 -- Generate check of the elaboration Boolean
1654 Insert_Elab_Check (N,
1655 New_Occurrence_Of (Elaboration_Entity (E), Loc));
1658 -- Generate the warning
1660 if not Suppress_Elaboration_Warnings (E)
1661 and then not Elaboration_Checks_Suppressed (E)
1665 ("instantiation of& may occur before body is seen?",
1669 ("call to& may occur before body is seen?", N, Orig_Ent);
1673 ("\Program_Error may be raised at run time?", N);
1679 -- Set flag to suppress further warnings on same subprogram
1680 -- unless in all errors mode
1682 if not All_Errors_Mode then
1683 Set_Suppress_Elaboration_Warnings (E);
1685 end Check_Internal_Call_Continue;
1687 ---------------------------
1688 -- Check_Task_Activation --
1689 ---------------------------
1691 procedure Check_Task_Activation (N : Node_Id) is
1692 Loc : constant Source_Ptr := Sloc (N);
1693 Inter_Procs : constant Elist_Id := New_Elmt_List;
1694 Intra_Procs : constant Elist_Id := New_Elmt_List;
1697 Task_Scope : Entity_Id;
1698 Cunit_SC : Boolean := False;
1701 Enclosing : Entity_Id;
1703 procedure Add_Task_Proc (Typ : Entity_Id);
1704 -- Add to Task_Procs the task body procedure(s) of task types in Typ.
1705 -- For record types, this procedure recurses over component types.
1707 procedure Collect_Tasks (Decls : List_Id);
1708 -- Collect the types of the tasks that are to be activated in the given
1709 -- list of declarations, in order to perform elaboration checks on the
1710 -- corresponding task procedures which are called implicitly here.
1712 function Outer_Unit (E : Entity_Id) return Entity_Id;
1713 -- find enclosing compilation unit of Entity, ignoring subunits, or
1714 -- else enclosing subprogram. If E is not a package, there is no need
1715 -- for inter-unit elaboration checks.
1721 procedure Add_Task_Proc (Typ : Entity_Id) is
1723 Proc : Entity_Id := Empty;
1726 if Is_Task_Type (Typ) then
1727 Proc := Get_Task_Body_Procedure (Typ);
1729 elsif Is_Array_Type (Typ)
1730 and then Has_Task (Base_Type (Typ))
1732 Add_Task_Proc (Component_Type (Typ));
1734 elsif Is_Record_Type (Typ)
1735 and then Has_Task (Base_Type (Typ))
1737 Comp := First_Component (Typ);
1739 while Present (Comp) loop
1740 Add_Task_Proc (Etype (Comp));
1741 Comp := Next_Component (Comp);
1745 -- If the task type is another unit, we will perform the usual
1746 -- elaboration check on its enclosing unit. If the type is in the
1747 -- same unit, we can trace the task body as for an internal call,
1748 -- but we only need to examine other external calls, because at
1749 -- the point the task is activated, internal subprogram bodies
1750 -- will have been elaborated already. We keep separate lists for
1751 -- each kind of task.
1753 -- Skip this test if errors have occurred, since in this case
1754 -- we can get false indications.
1756 if Serious_Errors_Detected /= 0 then
1760 if Present (Proc) then
1761 if Outer_Unit (Scope (Proc)) = Enclosing then
1763 if No (Corresponding_Body (Unit_Declaration_Node (Proc)))
1765 (not Is_Generic_Instance (Scope (Proc))
1767 Scope (Proc) = Scope (Defining_Identifier (Decl)))
1770 ("task will be activated before elaboration of its body?",
1773 ("Program_Error will be raised at run-time?", Decl);
1776 Present (Corresponding_Body (Unit_Declaration_Node (Proc)))
1778 Append_Elmt (Proc, Intra_Procs);
1782 Elmt := First_Elmt (Inter_Procs);
1784 -- No need for multiple entries of the same type.
1786 while Present (Elmt) loop
1787 if Node (Elmt) = Proc then
1794 Append_Elmt (Proc, Inter_Procs);
1803 procedure Collect_Tasks (Decls : List_Id) is
1805 if Present (Decls) then
1806 Decl := First (Decls);
1808 while Present (Decl) loop
1810 if Nkind (Decl) = N_Object_Declaration
1811 and then Has_Task (Etype (Defining_Identifier (Decl)))
1813 Add_Task_Proc (Etype (Defining_Identifier (Decl)));
1825 function Outer_Unit (E : Entity_Id) return Entity_Id is
1826 Outer : Entity_Id := E;
1829 while Present (Outer) loop
1830 if Elaboration_Checks_Suppressed (Outer) then
1834 exit when Is_Child_Unit (Outer)
1835 or else Scope (Outer) = Standard_Standard
1836 or else Ekind (Outer) /= E_Package;
1837 Outer := Scope (Outer);
1843 -- Start of processing for Check_Task_Activation
1846 Enclosing := Outer_Unit (Current_Scope);
1848 -- Find all tasks declared in the current unit.
1850 if Nkind (N) = N_Package_Body then
1851 P := Unit_Declaration_Node (Corresponding_Spec (N));
1853 Collect_Tasks (Declarations (N));
1854 Collect_Tasks (Visible_Declarations (Specification (P)));
1855 Collect_Tasks (Private_Declarations (Specification (P)));
1857 elsif Nkind (N) = N_Package_Declaration then
1858 Collect_Tasks (Visible_Declarations (Specification (N)));
1859 Collect_Tasks (Private_Declarations (Specification (N)));
1862 Collect_Tasks (Declarations (N));
1865 -- We only perform detailed checks in all tasks are library level
1866 -- entities. If the master is a subprogram or task, activation will
1867 -- depend on the activation of the master itself.
1868 -- Should dynamic checks be added in the more general case???
1870 if Ekind (Enclosing) /= E_Package then
1874 -- For task types defined in other units, we want the unit containing
1875 -- the task body to be elaborated before the current one.
1877 Elmt := First_Elmt (Inter_Procs);
1879 while Present (Elmt) loop
1881 Task_Scope := Outer_Unit (Scope (Ent));
1883 if not Is_Compilation_Unit (Task_Scope) then
1886 elsif Suppress_Elaboration_Warnings (Task_Scope)
1887 or else Elaboration_Checks_Suppressed (Task_Scope)
1891 elsif Dynamic_Elaboration_Checks then
1892 if not Elaboration_Checks_Suppressed (Ent)
1893 and then not Cunit_SC
1894 and then not Restrictions (No_Entry_Calls_In_Elaboration_Code)
1896 -- Runtime elaboration check required. generate check of the
1897 -- elaboration Boolean for the unit containing the entity.
1899 Insert_Elab_Check (N,
1900 Make_Attribute_Reference (Loc,
1901 Attribute_Name => Name_Elaborated,
1904 (Spec_Entity (Task_Scope), Loc)));
1908 -- Force the binder to elaborate other unit first
1910 if not Suppress_Elaboration_Warnings (Ent)
1911 and then not Elaboration_Checks_Suppressed (Ent)
1912 and then Elab_Warnings
1913 and then not Suppress_Elaboration_Warnings (Task_Scope)
1914 and then not Elaboration_Checks_Suppressed (Task_Scope)
1916 Error_Msg_Node_2 := Task_Scope;
1917 Error_Msg_NE ("activation of an instance of task type&" &
1918 " requires pragma Elaborate_All on &?", N, Ent);
1921 Set_Elaborate_All_Desirable (Task_Scope);
1922 Set_Suppress_Elaboration_Warnings (Task_Scope);
1928 -- For tasks declared in the current unit, trace other calls within
1929 -- the task procedure bodies, which are available.
1931 In_Task_Activation := True;
1932 Elmt := First_Elmt (Intra_Procs);
1934 while Present (Elmt) loop
1936 Check_Internal_Call_Continue (N, Ent, Enclosing, Ent);
1940 In_Task_Activation := False;
1941 end Check_Task_Activation;
1943 ----------------------
1944 -- Has_Generic_Body --
1945 ----------------------
1947 function Has_Generic_Body (N : Node_Id) return Boolean is
1948 Ent : constant Entity_Id := Get_Generic_Entity (N);
1949 Decl : constant Node_Id := Unit_Declaration_Node (Ent);
1952 function Find_Body_In (E : Entity_Id; N : Node_Id) return Node_Id;
1953 -- Determine if the list of nodes headed by N and linked by Next
1954 -- contains a package body for the package spec entity E, and if
1955 -- so return the package body. If not, then returns Empty.
1957 function Load_Package_Body (Nam : Unit_Name_Type) return Node_Id;
1958 -- This procedure is called load the unit whose name is given by Nam.
1959 -- This unit is being loaded to see whether it contains an optional
1960 -- generic body. The returned value is the loaded unit, which is
1961 -- always a package body (only package bodies can contain other
1962 -- entities in the sense in which Has_Generic_Body is interested).
1963 -- We only attempt to load bodies if we are generating code. If we
1964 -- are in semantics check only mode, then it would be wrong to load
1965 -- bodies that are not required from a semantic point of view, so
1966 -- in this case we return Empty. The result is that the caller may
1967 -- incorrectly decide that a generic spec does not have a body when
1968 -- in fact it does, but the only harm in this is that some warnings
1969 -- on elaboration problems may be lost in semantic checks only mode,
1970 -- which is not big loss. We also return Empty if we go for a body
1971 -- and it is not there.
1973 function Locate_Corresponding_Body (PE : Entity_Id) return Node_Id;
1974 -- PE is the entity for a package spec. This function locates the
1975 -- corresponding package body, returning Empty if none is found.
1976 -- The package body returned is fully parsed but may not yet be
1977 -- analyzed, so only syntactic fields should be referenced.
1983 function Find_Body_In (E : Entity_Id; N : Node_Id) return Node_Id is
1988 while Present (Nod) loop
1990 -- If we found the package body we are looking for, return it
1992 if Nkind (Nod) = N_Package_Body
1993 and then Chars (Defining_Unit_Name (Nod)) = Chars (E)
1997 -- If we found the stub for the body, go after the subunit,
1998 -- loading it if necessary.
2000 elsif Nkind (Nod) = N_Package_Body_Stub
2001 and then Chars (Defining_Identifier (Nod)) = Chars (E)
2003 if Present (Library_Unit (Nod)) then
2004 return Unit (Library_Unit (Nod));
2007 return Load_Package_Body (Get_Unit_Name (Nod));
2010 -- If neither package body nor stub, keep looking on chain
2020 -----------------------
2021 -- Load_Package_Body --
2022 -----------------------
2024 function Load_Package_Body (Nam : Unit_Name_Type) return Node_Id is
2025 U : Unit_Number_Type;
2028 if Operating_Mode /= Generate_Code then
2041 return Unit (Cunit (U));
2044 end Load_Package_Body;
2046 -------------------------------
2047 -- Locate_Corresponding_Body --
2048 -------------------------------
2050 function Locate_Corresponding_Body (PE : Entity_Id) return Node_Id is
2051 Spec : constant Node_Id := Declaration_Node (PE);
2052 Decl : constant Node_Id := Parent (Spec);
2053 Scop : constant Entity_Id := Scope (PE);
2057 if Is_Library_Level_Entity (PE) then
2059 -- If package is a library unit that requires a body, we have
2060 -- no choice but to go after that body because it might contain
2061 -- an optional body for the original generic package.
2063 if Unit_Requires_Body (PE) then
2065 -- Load the body. Note that we are a little careful here to
2066 -- use Spec to get the unit number, rather than PE or Decl,
2067 -- since in the case where the package is itself a library
2068 -- level instantiation, Spec will properly reference the
2069 -- generic template, which is what we really want.
2073 (Get_Body_Name (Unit_Name (Get_Source_Unit (Spec))));
2075 -- But if the package is a library unit that does NOT require
2076 -- a body, then no body is permitted, so we are sure that there
2077 -- is no body for the original generic package.
2083 -- Otherwise look and see if we are embedded in a further package
2085 elsif Is_Package (Scop) then
2087 -- If so, get the body of the enclosing package, and look in
2088 -- its package body for the package body we are looking for.
2090 PBody := Locate_Corresponding_Body (Scop);
2095 return Find_Body_In (PE, First (Declarations (PBody)));
2098 -- If we are not embedded in a further package, then the body
2099 -- must be in the same declarative part as we are.
2102 return Find_Body_In (PE, Next (Decl));
2104 end Locate_Corresponding_Body;
2106 -- Start of processing for Has_Generic_Body
2109 if Present (Corresponding_Body (Decl)) then
2112 elsif Unit_Requires_Body (Ent) then
2115 -- Compilation units cannot have optional bodies
2117 elsif Is_Compilation_Unit (Ent) then
2120 -- Otherwise look at what scope we are in
2123 Scop := Scope (Ent);
2125 -- Case of entity is in other than a package spec, in this case
2126 -- the body, if present, must be in the same declarative part.
2128 if not Is_Package (Scop) then
2133 P := Declaration_Node (Ent);
2135 -- Declaration node may get us a spec, so if so, go to
2136 -- the parent declaration.
2138 while not Is_List_Member (P) loop
2142 return Present (Find_Body_In (Ent, Next (P)));
2145 -- If the entity is in a package spec, then we have to locate
2146 -- the corresponding package body, and look there.
2150 PBody : constant Node_Id := Locate_Corresponding_Body (Scop);
2158 (Find_Body_In (Ent, (First (Declarations (PBody)))));
2163 end Has_Generic_Body;
2165 -----------------------
2166 -- Insert_Elab_Check --
2167 -----------------------
2169 procedure Insert_Elab_Check (N : Node_Id; C : Node_Id := Empty) is
2171 Loc : constant Source_Ptr := Sloc (N);
2174 -- If expansion is disabled, do not generate any checks. Also
2175 -- skip checks if any subunits are missing because in either
2176 -- case we lack the full information that we need, and no object
2177 -- file will be created in any case.
2179 if not Expander_Active or else Subunits_Missing then
2183 -- If we have a generic instantiation, where Instance_Spec is set,
2184 -- then this field points to a generic instance spec that has
2185 -- been inserted before the instantiation node itself, so that
2186 -- is where we want to insert a check.
2188 if Nkind (N) in N_Generic_Instantiation
2189 and then Present (Instance_Spec (N))
2191 Nod := Instance_Spec (N);
2196 -- If we are inserting at the top level, insert in Aux_Decls
2198 if Nkind (Parent (Nod)) = N_Compilation_Unit then
2200 ADN : constant Node_Id := Aux_Decls_Node (Parent (Nod));
2206 Make_Raise_Program_Error (Loc,
2207 Reason => PE_Access_Before_Elaboration);
2210 Make_Raise_Program_Error (Loc,
2211 Condition => Make_Op_Not (Loc, C),
2212 Reason => PE_Access_Before_Elaboration);
2215 if No (Declarations (ADN)) then
2216 Set_Declarations (ADN, New_List (R));
2218 Append_To (Declarations (ADN), R);
2224 -- Otherwise just insert before the node in question. However, if
2225 -- the context of the call has already been analyzed, an insertion
2226 -- will not work if it depends on subsequent expansion (e.g. a call in
2227 -- a branch of a short-circuit). In that case we replace the call with
2228 -- a conditional expression, or with a Raise if it is unconditional.
2229 -- Unfortunately this does not work if the call has a dynamic size,
2230 -- because gigi regards it as a dynamic-sized temporary. If such a call
2231 -- appears in a short-circuit expression, the elaboration check will be
2232 -- missed (rare enough ???). Otherwise, the code below inserts the check
2233 -- at the appropriate place before the call. Same applies in the even
2234 -- rarer case the return type has a known size but is unconstrained.
2237 if Nkind (N) = N_Function_Call
2238 and then Analyzed (Parent (N))
2239 and then Size_Known_At_Compile_Time (Etype (N))
2241 (not Has_Discriminants (Etype (N))
2242 or else Is_Constrained (Etype (N)))
2246 Typ : constant Entity_Id := Etype (N);
2247 Chk : constant Boolean := Do_Range_Check (N);
2249 R : constant Node_Id :=
2250 Make_Raise_Program_Error (Loc,
2251 Reason => PE_Access_Before_Elaboration);
2261 Make_Conditional_Expression (Loc,
2262 Expressions => New_List (C, Relocate_Node (N), R)));
2265 Analyze_And_Resolve (N, Typ);
2267 -- If the original call requires a range check, so does the
2268 -- conditional expression.
2271 Enable_Range_Check (N);
2273 Set_Do_Range_Check (N, False);
2280 Make_Raise_Program_Error (Loc,
2281 Reason => PE_Access_Before_Elaboration));
2284 Make_Raise_Program_Error (Loc,
2288 Reason => PE_Access_Before_Elaboration));
2292 end Insert_Elab_Check;
2298 procedure Output_Calls (N : Node_Id) is
2301 function Is_Printable_Error_Name (Nm : Name_Id) return Boolean;
2302 -- An internal function, used to determine if a name, Nm, is either
2303 -- a non-internal name, or is an internal name that is printable
2304 -- by the error message circuits (i.e. it has a single upper
2305 -- case letter at the end).
2307 function Is_Printable_Error_Name (Nm : Name_Id) return Boolean is
2309 if not Is_Internal_Name (Nm) then
2312 elsif Name_Len = 1 then
2316 Name_Len := Name_Len - 1;
2317 return not Is_Internal_Name;
2319 end Is_Printable_Error_Name;
2321 -- Start of processing for Output_Calls
2324 for J in reverse 1 .. Elab_Call.Last loop
2325 Error_Msg_Sloc := Elab_Call.Table (J).Cloc;
2327 Ent := Elab_Call.Table (J).Ent;
2329 if Is_Generic_Unit (Ent) then
2330 Error_Msg_NE ("\?& instantiated #", N, Ent);
2332 elsif Is_Init_Proc (Ent) then
2333 Error_Msg_N ("\?initialization procedure called #", N);
2335 elsif Is_Printable_Error_Name (Chars (Ent)) then
2336 Error_Msg_NE ("\?& called #", N, Ent);
2339 Error_Msg_N ("\? called #", N);
2344 ----------------------------
2345 -- Same_Elaboration_Scope --
2346 ----------------------------
2348 function Same_Elaboration_Scope (Scop1, Scop2 : Entity_Id) return Boolean is
2349 S1 : Entity_Id := Scop1;
2350 S2 : Entity_Id := Scop2;
2353 while S1 /= Standard_Standard
2354 and then (Ekind (S1) = E_Package
2356 Ekind (S1) = E_Block)
2361 while S2 /= Standard_Standard
2362 and then (Ekind (S2) = E_Package
2364 Ekind (S2) = E_Protected_Type
2366 Ekind (S2) = E_Block)
2372 end Same_Elaboration_Scope;
2378 procedure Set_C_Scope is
2380 while not Is_Compilation_Unit (C_Scope) loop
2381 C_Scope := Scope (C_Scope);
2389 function Spec_Entity (E : Entity_Id) return Entity_Id is
2393 -- Check for case of body entity
2394 -- Why is the check for E_Void needed???
2396 if Ekind (E) = E_Void
2397 or else Ekind (E) = E_Subprogram_Body
2398 or else Ekind (E) = E_Package_Body
2403 Decl := Parent (Decl);
2404 exit when Nkind (Decl) in N_Proper_Body;
2407 return Corresponding_Spec (Decl);
2418 procedure Supply_Bodies (N : Node_Id) is
2420 if Nkind (N) = N_Subprogram_Declaration then
2422 Ent : constant Entity_Id := Defining_Unit_Name (Specification (N));
2425 Set_Is_Imported (Ent);
2426 Set_Convention (Ent, Convention_Stubbed);
2429 elsif Nkind (N) = N_Package_Declaration then
2431 Spec : constant Node_Id := Specification (N);
2434 New_Scope (Defining_Unit_Name (Spec));
2435 Supply_Bodies (Visible_Declarations (Spec));
2436 Supply_Bodies (Private_Declarations (Spec));
2442 procedure Supply_Bodies (L : List_Id) is
2448 while Present (Elmt) loop
2449 Supply_Bodies (Elmt);
2459 function Within (E1, E2 : Entity_Id) return Boolean is
2469 elsif Scop = Standard_Standard then
2473 Scop := Scope (Scop);
2477 raise Program_Error;
2480 --------------------------
2481 -- Within_Elaborate_All --
2482 --------------------------
2484 function Within_Elaborate_All (E : Entity_Id) return Boolean is
2487 Elab_Id : Entity_Id;
2491 Item := First (Context_Items (Cunit (Current_Sem_Unit)));
2493 while Present (Item) loop
2494 if Nkind (Item) = N_Pragma
2495 and then Get_Pragma_Id (Chars (Item)) = Pragma_Elaborate_All
2497 if Error_Posted (Item) then
2499 -- Some previous error on the pragma itself
2506 Expression (First (Pragma_Argument_Associations (Item))));
2508 Par := Parent (Unit_Declaration_Node (Elab_Id));
2509 Item2 := First (Context_Items (Par));
2511 while Present (Item2) loop
2512 if Nkind (Item2) = N_With_Clause
2513 and then Entity (Name (Item2)) = E
2526 end Within_Elaborate_All;