PR target/16201
[official-gcc.git] / gcc / ada / sem_elab.adb
blob5c8b3e611b6d8e08a0db1b51d3d6d771c3f29d74
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- S E M _ E L A B --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1997-2004 Free Software Foundation, Inc. --
10 -- --
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. --
21 -- --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 -- --
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;
37 with Lib; use Lib;
38 with Lib.Load; use Lib.Load;
39 with Namet; use Namet;
40 with Nlists; use Nlists;
41 with Nmake; use Nmake;
42 with Opt; use Opt;
43 with Output; use Output;
44 with Restrict; use Restrict;
45 with Rident; use Rident;
46 with Sem; use Sem;
47 with Sem_Cat; use Sem_Cat;
48 with Sem_Ch7; use Sem_Ch7;
49 with Sem_Ch8; use Sem_Ch8;
50 with Sem_Res; use Sem_Res;
51 with Sem_Util; use Sem_Util;
52 with Sinfo; use Sinfo;
53 with Sinput; use Sinput;
54 with Snames; use Snames;
55 with Stand; use Stand;
56 with Table;
57 with Tbuild; use Tbuild;
58 with Uname; use Uname;
60 package body Sem_Elab is
62 -- The following table records the recursive call chain for output
63 -- in the Output routine. Each entry records the call node and the
64 -- entity of the called routine. The number of entries in the table
65 -- (i.e. the value of Elab_Call.Last) indicates the current depth
66 -- of recursion and is used to identify the outer level.
68 type Elab_Call_Entry is record
69 Cloc : Source_Ptr;
70 Ent : Entity_Id;
71 end record;
73 package Elab_Call is new Table.Table (
74 Table_Component_Type => Elab_Call_Entry,
75 Table_Index_Type => Int,
76 Table_Low_Bound => 1,
77 Table_Initial => 50,
78 Table_Increment => 100,
79 Table_Name => "Elab_Call");
81 -- This table is initialized at the start of each outer level call.
82 -- It holds the entities for all subprograms that have been examined
83 -- for this particular outer level call, and is used to prevent both
84 -- infinite recursion, and useless reanalysis of bodies already seen
86 package Elab_Visited is new Table.Table (
87 Table_Component_Type => Entity_Id,
88 Table_Index_Type => Int,
89 Table_Low_Bound => 1,
90 Table_Initial => 200,
91 Table_Increment => 100,
92 Table_Name => "Elab_Visited");
94 -- This table stores calls to Check_Internal_Call that are delayed
95 -- until all generics are instantiated, and in particular that all
96 -- generic bodies have been inserted. We need to delay, because we
97 -- need to be able to look through the inserted bodies.
99 type Delay_Element is record
100 N : Node_Id;
101 -- The parameter N from the call to Check_Internal_Call. Note that
102 -- this node may get rewritten over the delay period by expansion
103 -- in the call case (but not in the instantiation case).
105 E : Entity_Id;
106 -- The parameter E from the call to Check_Internal_Call
108 Orig_Ent : Entity_Id;
109 -- The parameter Orig_Ent from the call to Check_Internal_Call
111 Curscop : Entity_Id;
112 -- The current scope of the call. This is restored when we complete
113 -- the delayed call, so that we do this in the right scope.
115 From_Elab_Code : Boolean;
116 -- Save indication of whether this call is from elaboration code
118 Outer_Scope : Entity_Id;
119 -- Save scope of outer level call
121 end record;
123 package Delay_Check is new Table.Table (
124 Table_Component_Type => Delay_Element,
125 Table_Index_Type => Int,
126 Table_Low_Bound => 1,
127 Table_Initial => 1000,
128 Table_Increment => 100,
129 Table_Name => "Delay_Check");
131 C_Scope : Entity_Id;
132 -- Top level scope of current scope. We need to compute this only
133 -- once at the outer level, i.e. for a call to Check_Elab_Call from
134 -- outside this unit.
136 Outer_Level_Sloc : Source_Ptr;
137 -- Save Sloc value for outer level call node for comparisons of source
138 -- locations. A body is too late if it appears after the *outer* level
139 -- call, not the particular call that is being analyzed.
141 From_Elab_Code : Boolean;
142 -- This flag shows whether the outer level call currently being examined
143 -- is or is not in elaboration code. We are only interested in calls to
144 -- routines in other units if this flag is True.
146 In_Task_Activation : Boolean := False;
147 -- This flag indicates whether we are performing elaboration checks on
148 -- task procedures, at the point of activation. If true, we do not trace
149 -- internal calls in these procedures, because all local bodies are known
150 -- to be elaborated.
152 Delaying_Elab_Checks : Boolean := True;
153 -- This is set True till the compilation is complete, including the
154 -- insertion of all instance bodies. Then when Check_Elab_Calls is
155 -- called, the delay table is used to make the delayed calls and
156 -- this flag is reset to False, so that the calls are processed
158 -----------------------
159 -- Local Subprograms --
160 -----------------------
162 -- Note: Outer_Scope in all these calls represents the scope of
163 -- interest of the outer level call. If it is set to Standard_Standard,
164 -- then it means the outer level call was at elaboration level, and that
165 -- thus all calls are of interest. If it was set to some other scope,
166 -- then the original call was an inner call, and we are not interested
167 -- in calls that go outside this scope.
169 procedure Check_A_Call
170 (N : Node_Id;
171 E : Entity_Id;
172 Outer_Scope : Entity_Id;
173 Inter_Unit_Only : Boolean;
174 Generate_Warnings : Boolean := True);
175 -- This is the internal recursive routine that is called to check for
176 -- a possible elaboration error. The argument N is a subprogram call
177 -- or generic instantiation to be checked, and E is the entity of
178 -- the called subprogram, or instantiated generic unit. The flag
179 -- Outer_Scope is the outer level scope for the original call.
180 -- Inter_Unit_Only is set if the call is only to be checked in the
181 -- case where it is to another unit (and skipped if within a unit).
182 -- Generate_Warnings is set to False to suppress warning messages
183 -- about missing pragma Elaborate_All's. These messages are not
184 -- wanted for inner calls in the dynamic model.
186 procedure Check_Bad_Instantiation (N : Node_Id);
187 -- N is a node for an instantiation (if called with any other node kind,
188 -- Check_Bad_Instantiation ignores the call). This subprogram checks for
189 -- the special case of a generic instantiation of a generic spec in the
190 -- same declarative part as the instantiation where a body is present and
191 -- has not yet been seen. This is an obvious error, but needs to be checked
192 -- specially at the time of the instantiation, since it is a case where we
193 -- cannot insert the body anywhere. If this case is detected, warnings are
194 -- generated, and a raise of Program_Error is inserted. In addition any
195 -- subprograms in the generic spec are stubbed, and the Bad_Instantiation
196 -- flag is set on the instantiation node. The caller in Sem_Ch12 uses this
197 -- flag as an indication that no attempt should be made to insert an
198 -- instance body.
200 procedure Check_Internal_Call
201 (N : Node_Id;
202 E : Entity_Id;
203 Outer_Scope : Entity_Id;
204 Orig_Ent : Entity_Id);
205 -- N is a function call or procedure statement call node and E is
206 -- the entity of the called function, which is within the current
207 -- compilation unit (where subunits count as part of the parent).
208 -- This call checks if this call, or any call within any accessed
209 -- body could cause an ABE, and if so, outputs a warning. Orig_Ent
210 -- differs from E only in the case of renamings, and points to the
211 -- original name of the entity. This is used for error messages.
212 -- Outer_Scope is the outer level scope for the original call.
214 procedure Check_Internal_Call_Continue
215 (N : Node_Id;
216 E : Entity_Id;
217 Outer_Scope : Entity_Id;
218 Orig_Ent : Entity_Id);
219 -- The processing for Check_Internal_Call is divided up into two phases,
220 -- and this represents the second phase. The second phase is delayed if
221 -- Delaying_Elab_Calls is set to True. In this delayed case, the first
222 -- phase makes an entry in the Delay_Check table, which is processed
223 -- when Check_Elab_Calls is called. N, E and Orig_Ent are as for the call
224 -- to Check_Internal_Call. Outer_Scope is the outer level scope for
225 -- the original call.
227 function Has_Generic_Body (N : Node_Id) return Boolean;
228 -- N is a generic package instantiation node, and this routine determines
229 -- if this package spec does in fact have a generic body. If so, then
230 -- True is returned, otherwise False. Note that this is not at all the
231 -- same as checking if the unit requires a body, since it deals with
232 -- the case of optional bodies accurately (i.e. if a body is optional,
233 -- then it looks to see if a body is actually present). Note: this
234 -- function can only do a fully correct job if in generating code mode
235 -- where all bodies have to be present. If we are operating in semantics
236 -- check only mode, then in some cases of optional bodies, a result of
237 -- False may incorrectly be given. In practice this simply means that
238 -- some cases of warnings for incorrect order of elaboration will only
239 -- be given when generating code, which is not a big problem (and is
240 -- inevitable, given the optional body semantics of Ada).
242 procedure Insert_Elab_Check (N : Node_Id; C : Node_Id := Empty);
243 -- Given code for an elaboration check (or unconditional raise if
244 -- the check is not needed), inserts the code in the appropriate
245 -- place. N is the call or instantiation node for which the check
246 -- code is required. C is the test whose failure triggers the raise.
248 procedure Output_Calls (N : Node_Id);
249 -- Outputs chain of calls stored in the Elab_Call table. The caller
250 -- has already generated the main warning message, so the warnings
251 -- generated are all continuation messages. The argument is the
252 -- call node at which the messages are to be placed.
254 function Same_Elaboration_Scope (Scop1, Scop2 : Entity_Id) return Boolean;
255 -- Given two scopes, determine whether they are the same scope from an
256 -- elaboration point of view, i.e. packages and blocks are ignored.
258 procedure Set_C_Scope;
259 -- On entry C_Scope is set to some scope. On return, C_Scope is reset
260 -- to be the enclosing compilation unit of this scope.
262 function Spec_Entity (E : Entity_Id) return Entity_Id;
263 -- Given a compilation unit entity, if it is a spec entity, it is
264 -- returned unchanged. If it is a body entity, then the spec for
265 -- the corresponding spec is returned
267 procedure Supply_Bodies (N : Node_Id);
268 -- Given a node, N, that is either a subprogram declaration or a package
269 -- declaration, this procedure supplies dummy bodies for the subprogram
270 -- or for all subprograms in the package. If the given node is not one
271 -- of these two possibilities, then Supply_Bodies does nothing. The
272 -- dummy body is supplied by setting the subprogram to be Imported with
273 -- convention Stubbed.
275 procedure Supply_Bodies (L : List_Id);
276 -- Calls Supply_Bodies for all elements of the given list L.
278 function Within (E1, E2 : Entity_Id) return Boolean;
279 -- Given two scopes E1 and E2, returns True if E1 is equal to E2, or
280 -- is one of its contained scopes, False otherwise.
282 function Within_Elaborate_All (E : Entity_Id) return Boolean;
283 -- Before emitting a warning on a scope E for a missing elaborate_all,
284 -- check whether E may be in the context of a directly visible unit
285 -- U to which the pragma applies. This prevents spurious warnings when
286 -- the called entity is renamed within U.
288 ------------------
289 -- Check_A_Call --
290 ------------------
292 procedure Check_A_Call
293 (N : Node_Id;
294 E : Entity_Id;
295 Outer_Scope : Entity_Id;
296 Inter_Unit_Only : Boolean;
297 Generate_Warnings : Boolean := True)
299 Loc : constant Source_Ptr := Sloc (N);
300 Ent : Entity_Id;
301 Decl : Node_Id;
303 E_Scope : Entity_Id;
304 -- Top level scope of entity for called subprogram. This
305 -- value includes following renamings and derivations, so
306 -- this scope can be in a non-visible unit. This is the
307 -- scope that is to be investigated to see whether an
308 -- elaboration check is required.
310 W_Scope : Entity_Id;
311 -- Top level scope of directly called entity for subprogram.
312 -- This differs from E_Scope in the case where renamings or
313 -- derivations are involved, since it does not follow these
314 -- links, thus W_Scope is always in a visible unit. This is
315 -- the scope for the Elaborate_All if one is needed.
317 Body_Acts_As_Spec : Boolean;
318 -- Set to true if call is to body acting as spec (no separate spec)
320 Inst_Case : constant Boolean := Nkind (N) in N_Generic_Instantiation;
321 -- Indicates if we have instantiation case
323 Caller_Unit_Internal : Boolean;
324 Callee_Unit_Internal : Boolean;
326 Inst_Caller : Source_Ptr;
327 Inst_Callee : Source_Ptr;
329 Unit_Caller : Unit_Number_Type;
330 Unit_Callee : Unit_Number_Type;
332 Cunit_SC : Boolean := False;
333 -- Set to suppress dynamic elaboration checks where one of the
334 -- enclosing scopes has Elaboration_Checks_Suppressed set, or else
335 -- if a pragma Elaborate (_All) applies to that scope, in which case
336 -- warnings on the scope are also suppressed. For the internal case,
337 -- we ignore this flag.
339 begin
340 -- If the call is known to be within a local Suppress Elaboration
341 -- pragma, nothing to check. This can happen in task bodies.
343 if (Nkind (N) = N_Function_Call
344 or else Nkind (N) = N_Procedure_Call_Statement)
345 and then No_Elaboration_Check (N)
346 then
347 return;
348 end if;
350 -- Go to parent for derived subprogram, or to original subprogram
351 -- in the case of a renaming (Alias covers both these cases)
353 Ent := E;
354 loop
355 if (Suppress_Elaboration_Warnings (Ent)
356 or else Elaboration_Checks_Suppressed (Ent))
357 and then (Inst_Case or else No (Alias (Ent)))
358 then
359 return;
360 end if;
362 -- Nothing to do for imported entities
364 if Is_Imported (Ent) then
365 return;
366 end if;
368 exit when Inst_Case or else No (Alias (Ent));
369 Ent := Alias (Ent);
370 end loop;
372 Decl := Unit_Declaration_Node (Ent);
374 if Nkind (Decl) = N_Subprogram_Body then
375 Body_Acts_As_Spec := True;
377 elsif Nkind (Decl) = N_Subprogram_Declaration
378 or else Nkind (Decl) = N_Subprogram_Body_Stub
379 or else Inst_Case
380 then
381 Body_Acts_As_Spec := False;
383 -- If we have none of an instantiation, subprogram body or
384 -- subprogram declaration, then it is not a case that we want
385 -- to check. (One case is a call to a generic formal subprogram,
386 -- where we do not want the check in the template).
388 else
389 return;
390 end if;
392 E_Scope := Ent;
393 loop
394 if Elaboration_Checks_Suppressed (E_Scope)
395 or else Suppress_Elaboration_Warnings (E_Scope)
396 then
397 Cunit_SC := True;
398 end if;
400 -- Exit when we get to compilation unit, not counting subunits
402 exit when Is_Compilation_Unit (E_Scope)
403 and then (Is_Child_Unit (E_Scope)
404 or else Scope (E_Scope) = Standard_Standard);
406 -- If we did not find a compilation unit, other than standard,
407 -- then nothing to check (happens in some instantiation cases)
409 if E_Scope = Standard_Standard then
410 return;
412 -- Otherwise move up a scope looking for compilation unit
414 else
415 E_Scope := Scope (E_Scope);
416 end if;
417 end loop;
419 -- No checks needed for pure or preelaborated compilation units
421 if Is_Pure (E_Scope)
422 or else Is_Preelaborated (E_Scope)
423 then
424 return;
425 end if;
427 -- If the generic entity is within a deeper instance than we are, then
428 -- either the instantiation to which we refer itself caused an ABE, in
429 -- which case that will be handled separately, or else we know that the
430 -- body we need appears as needed at the point of the instantiation.
431 -- However, this assumption is only valid if we are in static mode.
433 if not Dynamic_Elaboration_Checks
434 and then Instantiation_Depth (Sloc (Ent)) >
435 Instantiation_Depth (Sloc (N))
436 then
437 return;
438 end if;
440 -- Do not give a warning for a package with no body
442 if Ekind (Ent) = E_Generic_Package
443 and then not Has_Generic_Body (N)
444 then
445 return;
446 end if;
448 -- Case of entity is not in current unit (i.e. with'ed unit case)
450 if E_Scope /= C_Scope then
452 -- We are only interested in such calls if the outer call was from
453 -- elaboration code, or if we are in Dynamic_Elaboration_Checks mode.
455 if not From_Elab_Code and then not Dynamic_Elaboration_Checks then
456 return;
457 end if;
459 -- Nothing to do if some scope said that no checks were required
461 if Cunit_SC then
462 return;
463 end if;
465 -- Nothing to do for a generic instance, because in this case
466 -- the checking was at the point of instantiation of the generic
467 -- However, this shortcut is only applicable in static mode.
469 if Is_Generic_Instance (Ent) and not Dynamic_Elaboration_Checks then
470 return;
471 end if;
473 -- Nothing to do if subprogram with no separate spec. However,
474 -- a call to Deep_Initialize may result in a call to a user-defined
475 -- Initialize procedure, which imposes a body dependency. This
476 -- happens only if the type is controlled and the Initialize
477 -- procedure is not inherited.
479 if Body_Acts_As_Spec then
480 if Is_TSS (Ent, TSS_Deep_Initialize) then
481 declare
482 Typ : Entity_Id;
483 Init : Entity_Id;
484 begin
485 Typ := Etype (Next_Formal (First_Formal (Ent)));
487 if not Is_Controlled (Typ) then
488 return;
489 else
490 Init := Find_Prim_Op (Typ, Name_Initialize);
492 if Comes_From_Source (Init) then
493 Ent := Init;
494 else
495 return;
496 end if;
497 end if;
498 end;
500 else
501 return;
502 end if;
503 end if;
505 -- Check cases of internal units
507 Callee_Unit_Internal :=
508 Is_Internal_File_Name
509 (Unit_File_Name (Get_Source_Unit (E_Scope)));
511 -- Do not give a warning if the with'ed unit is internal
512 -- and this is the generic instantiation case (this saves a
513 -- lot of hassle dealing with the Text_IO special child units)
515 if Callee_Unit_Internal and Inst_Case then
516 return;
517 end if;
519 if C_Scope = Standard_Standard then
520 Caller_Unit_Internal := False;
521 else
522 Caller_Unit_Internal :=
523 Is_Internal_File_Name
524 (Unit_File_Name (Get_Source_Unit (C_Scope)));
525 end if;
527 -- Do not give a warning if the with'ed unit is internal
528 -- and the caller is not internal (since the binder always
529 -- elaborates internal units first).
531 if Callee_Unit_Internal and (not Caller_Unit_Internal) then
532 return;
533 end if;
535 -- For now, if debug flag -gnatdE is not set, do no checking for
536 -- one internal unit withing another. This fixes the problem with
537 -- the sgi build and storage errors. To be resolved later ???
539 if (Callee_Unit_Internal and Caller_Unit_Internal)
540 and then not Debug_Flag_EE
541 then
542 return;
543 end if;
545 if Is_TSS (E, TSS_Deep_Initialize) then
546 Ent := E;
547 end if;
549 -- If the call is in an instance, and the called entity is not
550 -- defined in the same instance, then the elaboration issue
551 -- focuses around the unit containing the template, it is
552 -- this unit which requires an Elaborate_All.
554 -- However, if we are doing dynamic elaboration, we need to
555 -- chase the call in the usual manner.
557 -- We do not handle the case of calling a generic formal correctly
558 -- in the static case. See test 4703-004 to explore this gap ???
560 Inst_Caller := Instantiation (Get_Source_File_Index (Sloc (N)));
561 Inst_Callee := Instantiation (Get_Source_File_Index (Sloc (Ent)));
563 if Inst_Caller = No_Location then
564 Unit_Caller := No_Unit;
565 else
566 Unit_Caller := Get_Source_Unit (N);
567 end if;
569 if Inst_Callee = No_Location then
570 Unit_Callee := No_Unit;
571 else
572 Unit_Callee := Get_Source_Unit (Ent);
573 end if;
575 if Unit_Caller /= No_Unit
576 and then Unit_Callee /= Unit_Caller
577 and then not Dynamic_Elaboration_Checks
578 then
579 E_Scope := Spec_Entity (Cunit_Entity (Unit_Caller));
581 -- If we don't get a spec entity, just ignore call. Not
582 -- quite clear why this check is necessary.
584 if No (E_Scope) then
585 return;
586 end if;
588 -- Otherwise step to enclosing compilation unit
590 while not Is_Compilation_Unit (E_Scope) loop
591 E_Scope := Scope (E_Scope);
592 end loop;
594 -- For the case N is not an instance, or a call within instance
595 -- We recompute E_Scope for the error message, since we
596 -- do NOT want to go to the unit which has the ultimate
597 -- declaration in the case of renaming and derivation and
598 -- we also want to go to the generic unit in the case of
599 -- an instance, and no further.
601 else
602 -- Loop to carefully follow renamings and derivations
603 -- one step outside the current unit, but not further.
605 if not Inst_Case
606 and then Present (Alias (Ent))
607 then
608 E_Scope := Alias (Ent);
609 else
610 E_Scope := Ent;
611 end if;
613 loop
614 while not Is_Compilation_Unit (E_Scope) loop
615 E_Scope := Scope (E_Scope);
616 end loop;
618 -- If E_Scope is the same as C_Scope, it means that there
619 -- definitely was a local renaming or derivation, and we
620 -- are not yet out of the current unit.
622 exit when E_Scope /= C_Scope;
623 Ent := Alias (Ent);
624 E_Scope := Ent;
626 -- If no alias, there is a previous error
628 if No (Ent) then
629 return;
630 end if;
631 end loop;
632 end if;
634 if Within_Elaborate_All (E_Scope) then
635 return;
636 end if;
638 -- Find top level scope for called entity (not following renamings
639 -- or derivations). This is where the Elaborate_All will go if it
640 -- is needed. We start with the called entity, except in the case
641 -- of an initialization procedure outside the current package, where
642 -- the init proc is in the root package, and we start from the entity
643 -- of the name in the call.
645 if Is_Entity_Name (Name (N))
646 and then Is_Init_Proc (Entity (Name (N)))
647 and then not In_Same_Extended_Unit (N, Entity (Name (N)))
648 then
649 W_Scope := Scope (Entity (Name (N)));
650 else
651 W_Scope := E;
652 end if;
654 while not Is_Compilation_Unit (W_Scope) loop
655 W_Scope := Scope (W_Scope);
656 end loop;
658 -- Now check if an elaborate_all (or dynamic check) is needed
660 if not Suppress_Elaboration_Warnings (Ent)
661 and then not Elaboration_Checks_Suppressed (Ent)
662 and then not Suppress_Elaboration_Warnings (E_Scope)
663 and then not Elaboration_Checks_Suppressed (E_Scope)
664 and then Elab_Warnings
665 and then Generate_Warnings
666 then
667 if Inst_Case then
668 Error_Msg_NE
669 ("instantiation of& may raise Program_Error?", N, Ent);
671 else
672 if Is_Init_Proc (Entity (Name (N)))
673 and then Comes_From_Source (Ent)
674 then
675 Error_Msg_NE
676 ("implicit call to & may raise Program_Error?", N, Ent);
678 else
679 Error_Msg_NE
680 ("call to & may raise Program_Error?", N, Ent);
681 end if;
682 end if;
684 Error_Msg_Qual_Level := Nat'Last;
685 Error_Msg_NE
686 ("\missing pragma Elaborate_All for&?", N, W_Scope);
687 Error_Msg_Qual_Level := 0;
688 Output_Calls (N);
690 -- Set flag to prevent further warnings for same unit
691 -- unless in All_Errors_Mode.
693 if not All_Errors_Mode and not Dynamic_Elaboration_Checks then
694 Set_Suppress_Elaboration_Warnings (W_Scope, True);
695 end if;
696 end if;
698 -- Check for runtime elaboration check required
700 if Dynamic_Elaboration_Checks then
701 if not Elaboration_Checks_Suppressed (Ent)
702 and then not Elaboration_Checks_Suppressed (W_Scope)
703 and then not Elaboration_Checks_Suppressed (E_Scope)
704 and then not Cunit_SC
705 then
706 -- Runtime elaboration check required. Generate check of the
707 -- elaboration Boolean for the unit containing the entity.
709 -- Note that for this case, we do check the real unit (the
710 -- one from following renamings, since that is the issue!)
712 -- Could this possibly miss a useless but required PE???
714 Insert_Elab_Check (N,
715 Make_Attribute_Reference (Loc,
716 Attribute_Name => Name_Elaborated,
717 Prefix =>
718 New_Occurrence_Of
719 (Spec_Entity (E_Scope), Loc)));
720 end if;
722 -- Case of static elaboration model
724 else
725 -- Do not do anything if elaboration checks suppressed. Note
726 -- that we check Ent here, not E, since we want the real entity
727 -- for the body to see if checks are suppressed for it, not the
728 -- dummy entry for renamings or derivations.
730 if Elaboration_Checks_Suppressed (Ent)
731 or else Elaboration_Checks_Suppressed (E_Scope)
732 or else Elaboration_Checks_Suppressed (W_Scope)
733 then
734 null;
736 -- Here we need to generate an implicit elaborate all
738 else
739 -- Generate elaborate_all warning unless suppressed
741 if (Elab_Warnings and Generate_Warnings and not Inst_Case)
742 and then not Suppress_Elaboration_Warnings (Ent)
743 and then not Suppress_Elaboration_Warnings (E_Scope)
744 and then not Suppress_Elaboration_Warnings (W_Scope)
745 then
746 Error_Msg_Node_2 := W_Scope;
747 Error_Msg_NE
748 ("call to& in elaboration code " &
749 "requires pragma Elaborate_All on&?", N, E);
750 end if;
752 -- Set indication for binder to generate Elaborate_All
754 Set_Elaborate_All_Desirable (W_Scope);
755 Set_Suppress_Elaboration_Warnings (W_Scope, True);
756 end if;
757 end if;
759 -- Case of entity is in same unit as call or instantiation
761 elsif not Inter_Unit_Only then
762 Check_Internal_Call (N, Ent, Outer_Scope, E);
763 end if;
764 end Check_A_Call;
766 -----------------------------
767 -- Check_Bad_Instantiation --
768 -----------------------------
770 procedure Check_Bad_Instantiation (N : Node_Id) is
771 Ent : Entity_Id;
773 begin
774 -- Nothing to do if we do not have an instantiation (happens in some
775 -- error cases, and also in the formal package declaration case)
777 if Nkind (N) not in N_Generic_Instantiation then
778 return;
780 -- Nothing to do if serious errors detected (avoid cascaded errors)
782 elsif Serious_Errors_Detected /= 0 then
783 return;
785 -- Nothing to do if not in full analysis mode
787 elsif not Full_Analysis then
788 return;
790 -- Nothing to do if inside a generic template
792 elsif Inside_A_Generic then
793 return;
795 -- Nothing to do if a library level instantiation
797 elsif Nkind (Parent (N)) = N_Compilation_Unit then
798 return;
800 -- Nothing to do if we are compiling a proper body for semantic
801 -- purposes only. The generic body may be in another proper body.
803 elsif
804 Nkind (Parent (Unit_Declaration_Node (Main_Unit_Entity))) = N_Subunit
805 then
806 return;
807 end if;
809 Ent := Get_Generic_Entity (N);
811 -- The case we are interested in is when the generic spec is in the
812 -- current declarative part
814 if not Same_Elaboration_Scope (Current_Scope, Scope (Ent))
815 or else not In_Same_Extended_Unit (N, Ent)
816 then
817 return;
818 end if;
820 -- If the generic entity is within a deeper instance than we are, then
821 -- either the instantiation to which we refer itself caused an ABE, in
822 -- which case that will be handled separately. Otherwise, we know that
823 -- the body we need appears as needed at the point of the instantiation.
824 -- If they are both at the same level but not within the same instance
825 -- then the body of the generic will be in the earlier instance.
827 declare
828 D1 : constant Int := Instantiation_Depth (Sloc (Ent));
829 D2 : constant Int := Instantiation_Depth (Sloc (N));
831 begin
832 if D1 > D2 then
833 return;
835 elsif D1 = D2
836 and then Is_Generic_Instance (Scope (Ent))
837 and then not In_Open_Scopes (Scope (Ent))
838 then
839 return;
840 end if;
841 end;
843 -- Now we can proceed, if the entity being called has a completion,
844 -- then we are definitely OK, since we have already seen the body.
846 if Has_Completion (Ent) then
847 return;
848 end if;
850 -- If there is no body, then nothing to do
852 if not Has_Generic_Body (N) then
853 return;
854 end if;
856 -- Here we definitely have a bad instantiation
858 Error_Msg_NE
859 ("?cannot instantiate& before body seen", N, Ent);
861 if Present (Instance_Spec (N)) then
862 Supply_Bodies (Instance_Spec (N));
863 end if;
865 Error_Msg_N
866 ("\?Program_Error will be raised at run time", N);
867 Insert_Elab_Check (N);
868 Set_ABE_Is_Certain (N);
870 end Check_Bad_Instantiation;
872 ---------------------
873 -- Check_Elab_Call --
874 ---------------------
876 procedure Check_Elab_Call
877 (N : Node_Id;
878 Outer_Scope : Entity_Id := Empty)
880 Ent : Entity_Id;
881 P : Node_Id;
883 function Get_Called_Ent return Entity_Id;
884 -- Retrieve called entity. If this is a call to a protected subprogram,
885 -- entity is a selected component. The callable entity may be absent,
886 -- in which case there is no check to perform. This happens with
887 -- non-analyzed calls in nested generics.
889 --------------------
890 -- Get_Called_Ent --
891 --------------------
893 function Get_Called_Ent return Entity_Id is
894 Nam : Node_Id;
896 begin
897 Nam := Name (N);
899 if No (Nam) then
900 return Empty;
902 elsif Nkind (Nam) = N_Selected_Component then
903 return Entity (Selector_Name (Nam));
905 elsif not Is_Entity_Name (Nam) then
906 return Empty;
908 else
909 return Entity (Nam);
910 end if;
911 end Get_Called_Ent;
913 -- Start of processing for Check_Elab_Call
915 begin
916 -- If the call does not come from the main unit, there is nothing to
917 -- check. Elaboration call from units in the context of the main unit
918 -- will lead to semantic dependencies when those units are compiled.
920 if not In_Extended_Main_Code_Unit (N) then
921 return;
922 end if;
924 -- For an entry call, check relevant restriction
926 if Nkind (N) = N_Entry_Call_Statement
927 and then not In_Subprogram_Or_Concurrent_Unit
928 then
929 Check_Restriction (No_Entry_Calls_In_Elaboration_Code, N);
931 -- Nothing to do if this is not a call (happens in some error
932 -- conditions, and in some cases where rewriting occurs).
934 elsif Nkind (N) /= N_Function_Call
935 and then Nkind (N) /= N_Procedure_Call_Statement
936 then
937 return;
939 -- Nothing to do if this is a call already rewritten for elab checking.
941 elsif Nkind (Parent (N)) = N_Conditional_Expression then
942 return;
944 -- Nothing to do if inside a generic template
946 elsif Inside_A_Generic
947 and then not Present (Enclosing_Generic_Body (N))
948 then
949 return;
950 end if;
952 -- Here we have a call at elaboration time which must be checked
954 if Debug_Flag_LL then
955 Write_Str (" Check_Elab_Call: ");
957 if No (Name (N))
958 or else not Is_Entity_Name (Name (N))
959 then
960 Write_Str ("<<not entity name>> ");
961 else
962 Write_Name (Chars (Entity (Name (N))));
963 end if;
965 Write_Str (" call at ");
966 Write_Location (Sloc (N));
967 Write_Eol;
968 end if;
970 -- Climb up the tree to make sure we are not inside a
971 -- default expression of a parameter specification or
972 -- a record component, since in both these cases, we
973 -- will be doing the actual call later, not now, and it
974 -- is at the time of the actual call (statically speaking)
975 -- that we must do our static check, not at the time of
976 -- its initial analysis). However, we have to check calls
977 -- within component definitions (e.g., a function call
978 -- that determines an array component bound), so we
979 -- terminate the loop in that case.
981 P := Parent (N);
982 while Present (P) loop
983 if Nkind (P) = N_Parameter_Specification
984 or else
985 Nkind (P) = N_Component_Declaration
986 then
987 return;
989 -- The call occurs within the constraint of a component,
990 -- so it must be checked.
992 elsif Nkind (P) = N_Component_Definition then
993 exit;
995 else
996 P := Parent (P);
997 end if;
998 end loop;
1000 -- Stuff that happens only at the outer level
1002 if No (Outer_Scope) then
1003 Elab_Visited.Set_Last (0);
1005 -- Nothing to do if current scope is Standard (this is a bit
1006 -- odd, but it happens in the case of generic instantiations).
1008 C_Scope := Current_Scope;
1010 if C_Scope = Standard_Standard then
1011 return;
1012 end if;
1014 -- First case, we are in elaboration code
1016 From_Elab_Code := not In_Subprogram_Or_Concurrent_Unit;
1017 if From_Elab_Code then
1019 -- Complain if call that comes from source in preelaborated
1020 -- unit and we are not inside a subprogram (i.e. we are in
1021 -- elab code)
1023 if Comes_From_Source (N)
1024 and then In_Preelaborated_Unit
1025 and then not In_Inlined_Body
1026 then
1027 Error_Msg_N
1028 ("non-static call not allowed in preelaborated unit", N);
1029 return;
1030 end if;
1032 -- Second case, we are inside a subprogram or concurrent unit
1033 -- i.e, we are not in elaboration code.
1035 else
1036 -- In this case, the issue is whether we are inside the
1037 -- declarative part of the unit in which we live, or inside
1038 -- its statements. In the latter case, there is no issue of
1039 -- ABE calls at this level (a call from outside to the unit
1040 -- in which we live might cause an ABE, but that will be
1041 -- detected when we analyze that outer level call, as it
1042 -- recurses into the called unit).
1044 -- Climb up the tree, doing this test, and also testing
1045 -- for being inside a default expression, which, as
1046 -- discussed above, is not checked at this stage.
1048 declare
1049 P : Node_Id;
1050 L : List_Id;
1052 begin
1053 P := N;
1054 loop
1055 -- If we find a parentless subtree, it seems safe to
1056 -- assume that we are not in a declarative part and
1057 -- that no checking is required.
1059 if No (P) then
1060 return;
1061 end if;
1063 if Is_List_Member (P) then
1064 L := List_Containing (P);
1065 P := Parent (L);
1066 else
1067 L := No_List;
1068 P := Parent (P);
1069 end if;
1071 exit when Nkind (P) = N_Subunit;
1073 -- Filter out case of default expressions, where
1074 -- we do not do the check at this stage.
1076 if Nkind (P) = N_Parameter_Specification
1077 or else
1078 Nkind (P) = N_Component_Declaration
1079 then
1080 return;
1081 end if;
1083 if Nkind (P) = N_Subprogram_Body
1084 or else
1085 Nkind (P) = N_Protected_Body
1086 or else
1087 Nkind (P) = N_Task_Body
1088 or else
1089 Nkind (P) = N_Block_Statement
1090 then
1091 if L = Declarations (P) then
1092 exit;
1094 -- We are not in elaboration code, but we are doing
1095 -- dynamic elaboration checks, in this case, we still
1096 -- need to do the call, since the subprogram we are in
1097 -- could be called from another unit, also in dynamic
1098 -- elaboration check mode, at elaboration time.
1100 elsif Dynamic_Elaboration_Checks then
1102 -- This is a rather new check, going into version
1103 -- 3.14a1 for the first time (V1.80 of this unit),
1104 -- so we provide a debug flag to enable it. That
1105 -- way we have an easy work around for regressions
1106 -- that are caused by this new check. This debug
1107 -- flag can be removed later.
1109 if Debug_Flag_DD then
1110 return;
1111 end if;
1113 -- Do the check in this case
1115 exit;
1117 elsif Nkind (P) = N_Task_Body then
1119 -- The check is deferred until Check_Task_Activation
1120 -- but we need to capture local suppress pragmas
1121 -- that may inhibit checks on this call.
1123 Ent := Get_Called_Ent;
1125 if No (Ent) then
1126 return;
1128 elsif Elaboration_Checks_Suppressed (Current_Scope)
1129 or else Elaboration_Checks_Suppressed (Ent)
1130 or else Elaboration_Checks_Suppressed (Scope (Ent))
1131 then
1132 Set_No_Elaboration_Check (N);
1133 end if;
1135 return;
1137 -- Static model, call is not in elaboration code, we
1138 -- never need to worry, because in the static model
1139 -- the top level caller always takes care of things.
1141 else
1142 return;
1143 end if;
1144 end if;
1145 end loop;
1146 end;
1147 end if;
1148 end if;
1150 Ent := Get_Called_Ent;
1152 if No (Ent) then
1153 return;
1154 end if;
1156 -- Nothing to do if this is a recursive call (i.e. a call to
1157 -- an entity that is already in the Elab_Call stack)
1159 for J in 1 .. Elab_Visited.Last loop
1160 if Ent = Elab_Visited.Table (J) then
1161 return;
1162 end if;
1163 end loop;
1165 -- See if we need to analyze this call. We analyze it if either of
1166 -- the following conditions is met:
1168 -- It is an inner level call (since in this case it was triggered
1169 -- by an outer level call from elaboration code), but only if the
1170 -- call is within the scope of the original outer level call.
1172 -- It is an outer level call from elaboration code, or the called
1173 -- entity is in the same elaboration scope.
1175 -- And in these cases, we will check both inter-unit calls and
1176 -- intra-unit (within a single unit) calls.
1178 C_Scope := Current_Scope;
1180 -- If not outer level call, then we follow it if it is within
1181 -- the original scope of the outer call.
1183 if Present (Outer_Scope)
1184 and then Within (Scope (Ent), Outer_Scope)
1185 then
1186 Set_C_Scope;
1187 Check_A_Call (N, Ent, Outer_Scope, Inter_Unit_Only => False);
1189 elsif Elaboration_Checks_Suppressed (Current_Scope) then
1190 null;
1192 elsif From_Elab_Code then
1193 Set_C_Scope;
1194 Check_A_Call (N, Ent, Standard_Standard, Inter_Unit_Only => False);
1196 elsif Same_Elaboration_Scope (C_Scope, Scope (Ent)) then
1197 Set_C_Scope;
1198 Check_A_Call (N, Ent, Scope (Ent), Inter_Unit_Only => False);
1200 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode
1201 -- is set, then we will do the check, but only in the inter-unit case
1202 -- (this is to accommodate unguarded elaboration calls from other units
1203 -- in which this same mode is set). We don't want warnings in this case,
1204 -- it would generate warnings having nothing to do with elaboration.
1206 elsif Dynamic_Elaboration_Checks then
1207 Set_C_Scope;
1208 Check_A_Call
1210 Ent,
1211 Standard_Standard,
1212 Inter_Unit_Only => True,
1213 Generate_Warnings => False);
1215 -- Otherwise nothing to do
1217 else
1218 return;
1219 end if;
1221 -- A call to an Init_Proc in elaboration code may bring additional
1222 -- dependencies, if some of the record components thereof have
1223 -- initializations that are function calls that come from source.
1224 -- We treat the current node as a call to each of these functions,
1225 -- to check their elaboration impact.
1227 if Is_Init_Proc (Ent)
1228 and then From_Elab_Code
1229 then
1230 Process_Init_Proc : declare
1231 Unit_Decl : constant Node_Id := Unit_Declaration_Node (Ent);
1233 function Process (Nod : Node_Id) return Traverse_Result;
1234 -- Find subprogram calls within body of init_proc for
1235 -- Traverse instantiation below.
1237 function Process (Nod : Node_Id) return Traverse_Result is
1238 Func : Entity_Id;
1240 begin
1241 if (Nkind (Nod) = N_Function_Call
1242 or else Nkind (Nod) = N_Procedure_Call_Statement)
1243 and then Is_Entity_Name (Name (Nod))
1244 then
1245 Func := Entity (Name (Nod));
1247 if Comes_From_Source (Func) then
1248 Check_A_Call
1249 (N, Func, Standard_Standard, Inter_Unit_Only => True);
1250 end if;
1252 return OK;
1254 else
1255 return OK;
1256 end if;
1257 end Process;
1259 procedure Traverse_Body is new Traverse_Proc (Process);
1261 -- Start of processing for Process_Init_Proc
1263 begin
1264 if Nkind (Unit_Decl) = N_Subprogram_Body then
1265 Traverse_Body (Handled_Statement_Sequence (Unit_Decl));
1266 end if;
1267 end Process_Init_Proc;
1268 end if;
1269 end Check_Elab_Call;
1271 ----------------------
1272 -- Check_Elab_Calls --
1273 ----------------------
1275 procedure Check_Elab_Calls is
1276 begin
1277 -- If expansion is disabled, do not generate any checks. Also
1278 -- skip checks if any subunits are missing because in either
1279 -- case we lack the full information that we need, and no object
1280 -- file will be created in any case.
1282 if not Expander_Active
1283 or else Is_Generic_Unit (Cunit_Entity (Main_Unit))
1284 or else Subunits_Missing
1285 then
1286 return;
1287 end if;
1289 -- Skip delayed calls if we had any errors
1291 if Serious_Errors_Detected = 0 then
1292 Delaying_Elab_Checks := False;
1293 Expander_Mode_Save_And_Set (True);
1295 for J in Delay_Check.First .. Delay_Check.Last loop
1296 New_Scope (Delay_Check.Table (J).Curscop);
1297 From_Elab_Code := Delay_Check.Table (J).From_Elab_Code;
1299 Check_Internal_Call_Continue (
1300 N => Delay_Check.Table (J).N,
1301 E => Delay_Check.Table (J).E,
1302 Outer_Scope => Delay_Check.Table (J).Outer_Scope,
1303 Orig_Ent => Delay_Check.Table (J).Orig_Ent);
1305 Pop_Scope;
1306 end loop;
1308 -- Set Delaying_Elab_Checks back on for next main compilation
1310 Expander_Mode_Restore;
1311 Delaying_Elab_Checks := True;
1312 end if;
1313 end Check_Elab_Calls;
1315 ------------------------------
1316 -- Check_Elab_Instantiation --
1317 ------------------------------
1319 procedure Check_Elab_Instantiation
1320 (N : Node_Id;
1321 Outer_Scope : Entity_Id := Empty)
1323 Ent : Entity_Id;
1325 begin
1326 -- Check for and deal with bad instantiation case. There is some
1327 -- duplicated code here, but we will worry about this later ???
1329 Check_Bad_Instantiation (N);
1331 if ABE_Is_Certain (N) then
1332 return;
1333 end if;
1335 -- Nothing to do if we do not have an instantiation (happens in some
1336 -- error cases, and also in the formal package declaration case)
1338 if Nkind (N) not in N_Generic_Instantiation then
1339 return;
1340 end if;
1342 -- Nothing to do if inside a generic template
1344 if Inside_A_Generic then
1345 return;
1346 end if;
1348 Ent := Get_Generic_Entity (N);
1349 From_Elab_Code := not In_Subprogram_Or_Concurrent_Unit;
1351 -- See if we need to analyze this instantiation. We analyze it if
1352 -- either of the following conditions is met:
1354 -- It is an inner level instantiation (since in this case it was
1355 -- triggered by an outer level call from elaboration code), but
1356 -- only if the instantiation is within the scope of the original
1357 -- outer level call.
1359 -- It is an outer level instantiation from elaboration code, or the
1360 -- instantiated entity is in the same elaboratoin scope.
1362 -- And in these cases, we will check both the inter-unit case and
1363 -- the intra-unit (within a single unit) case.
1365 C_Scope := Current_Scope;
1367 if Present (Outer_Scope)
1368 and then Within (Scope (Ent), Outer_Scope)
1369 then
1370 Set_C_Scope;
1371 Check_A_Call (N, Ent, Outer_Scope, Inter_Unit_Only => False);
1373 elsif From_Elab_Code then
1374 Set_C_Scope;
1375 Check_A_Call (N, Ent, Standard_Standard, Inter_Unit_Only => False);
1377 elsif Same_Elaboration_Scope (C_Scope, Scope (Ent)) then
1378 Set_C_Scope;
1379 Check_A_Call (N, Ent, Scope (Ent), Inter_Unit_Only => False);
1381 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode
1382 -- is set, then we will do the check, but only in the inter-unit case
1383 -- (this is to accommodate unguarded elaboration calls from other units
1384 -- in which this same mode is set). We inhibit warnings in this case,
1385 -- since this instantiation is not occurring in elaboration code.
1387 elsif Dynamic_Elaboration_Checks then
1388 Set_C_Scope;
1389 Check_A_Call
1391 Ent,
1392 Standard_Standard,
1393 Inter_Unit_Only => True,
1394 Generate_Warnings => False);
1396 else
1397 return;
1398 end if;
1399 end Check_Elab_Instantiation;
1401 -------------------------
1402 -- Check_Internal_Call --
1403 -------------------------
1405 procedure Check_Internal_Call
1406 (N : Node_Id;
1407 E : Entity_Id;
1408 Outer_Scope : Entity_Id;
1409 Orig_Ent : Entity_Id)
1411 Inst_Case : constant Boolean := Nkind (N) in N_Generic_Instantiation;
1413 begin
1414 -- If not function or procedure call or instantiation, then ignore
1415 -- call (this happens in some error case and rewriting cases)
1417 if Nkind (N) /= N_Function_Call
1418 and then
1419 Nkind (N) /= N_Procedure_Call_Statement
1420 and then
1421 not Inst_Case
1422 then
1423 return;
1425 -- Nothing to do if this is a call or instantiation that has
1426 -- already been found to be a sure ABE
1428 elsif ABE_Is_Certain (N) then
1429 return;
1431 -- Nothing to do if errors already detected (avoid cascaded errors)
1433 elsif Serious_Errors_Detected /= 0 then
1434 return;
1436 -- Nothing to do if not in full analysis mode
1438 elsif not Full_Analysis then
1439 return;
1441 -- Nothing to do if within a default expression, since the call
1442 -- is not actualy being made at this time.
1444 elsif In_Default_Expression then
1445 return;
1447 -- Nothing to do for call to intrinsic subprogram
1449 elsif Is_Intrinsic_Subprogram (E) then
1450 return;
1452 -- No need to trace local calls if checking task activation, because
1453 -- other local bodies are elaborated already.
1455 elsif In_Task_Activation then
1456 return;
1457 end if;
1459 -- Delay this call if we are still delaying calls
1461 if Delaying_Elab_Checks then
1462 Delay_Check.Increment_Last;
1463 Delay_Check.Table (Delay_Check.Last) :=
1464 (N => N,
1465 E => E,
1466 Orig_Ent => Orig_Ent,
1467 Curscop => Current_Scope,
1468 Outer_Scope => Outer_Scope,
1469 From_Elab_Code => From_Elab_Code);
1470 return;
1472 -- Otherwise, call phase 2 continuation right now
1474 else
1475 Check_Internal_Call_Continue (N, E, Outer_Scope, Orig_Ent);
1476 end if;
1478 end Check_Internal_Call;
1480 ----------------------------------
1481 -- Check_Internal_Call_Continue --
1482 ----------------------------------
1484 procedure Check_Internal_Call_Continue
1485 (N : Node_Id;
1486 E : Entity_Id;
1487 Outer_Scope : Entity_Id;
1488 Orig_Ent : Entity_Id)
1490 Loc : constant Source_Ptr := Sloc (N);
1491 Inst_Case : constant Boolean := Is_Generic_Unit (E);
1493 Sbody : Node_Id;
1494 Ebody : Entity_Id;
1496 function Process (N : Node_Id) return Traverse_Result;
1497 -- Function applied to each node as we traverse the body.
1498 -- Checks for call that needs checking, and if so checks
1499 -- it. Always returns OK, so entire tree is traversed.
1501 -------------
1502 -- Process --
1503 -------------
1505 function Process (N : Node_Id) return Traverse_Result is
1506 begin
1507 -- If user has specified that there are no entry calls in elaboration
1508 -- code, do not trace past an accept statement, because the rendez-
1509 -- vous will happen after elaboration.
1511 if (Nkind (Original_Node (N)) = N_Accept_Statement
1512 or else Nkind (Original_Node (N)) = N_Selective_Accept)
1513 and then Restriction_Active (No_Entry_Calls_In_Elaboration_Code)
1514 then
1515 return Abandon;
1517 -- If we have a subprogram call, check it
1519 elsif Nkind (N) = N_Function_Call
1520 or else Nkind (N) = N_Procedure_Call_Statement
1521 then
1522 Check_Elab_Call (N, Outer_Scope);
1523 return OK;
1525 -- If we have a generic instantiation, check it
1527 elsif Nkind (N) in N_Generic_Instantiation then
1528 Check_Elab_Instantiation (N, Outer_Scope);
1529 return OK;
1531 -- Skip subprogram bodies that come from source (wait for
1532 -- call to analyze these). The reason for the come from
1533 -- source test is to avoid catching task bodies.
1535 -- For task bodies, we should really avoid these too, waiting
1536 -- for the task activation, but that's too much trouble to
1537 -- catch for now, so we go in unconditionally. This is not
1538 -- so terrible, it means the error backtrace is not quite
1539 -- complete, and we are too eager to scan bodies of tasks
1540 -- that are unused, but this is hardly very significant!
1542 elsif Nkind (N) = N_Subprogram_Body
1543 and then Comes_From_Source (N)
1544 then
1545 return Skip;
1547 else
1548 return OK;
1549 end if;
1550 end Process;
1552 procedure Traverse is new Atree.Traverse_Proc;
1553 -- Traverse procedure using above Process function
1555 -- Start of processing for Check_Internal_Call_Continue
1557 begin
1558 -- Save outer level call if at outer level
1560 if Elab_Call.Last = 0 then
1561 Outer_Level_Sloc := Loc;
1562 end if;
1564 Elab_Visited.Increment_Last;
1565 Elab_Visited.Table (Elab_Visited.Last) := E;
1567 -- If the call is to a function that renames a literal, no check
1568 -- is needed.
1570 if Ekind (E) = E_Enumeration_Literal then
1571 return;
1572 end if;
1574 Sbody := Unit_Declaration_Node (E);
1576 if Nkind (Sbody) /= N_Subprogram_Body
1577 and then
1578 Nkind (Sbody) /= N_Package_Body
1579 then
1580 Ebody := Corresponding_Body (Sbody);
1582 if No (Ebody) then
1583 return;
1584 else
1585 Sbody := Unit_Declaration_Node (Ebody);
1586 end if;
1587 end if;
1589 -- If the body appears after the outer level call or
1590 -- instantiation then we have an error case handled below.
1592 if Earlier_In_Extended_Unit (Outer_Level_Sloc, Sloc (Sbody))
1593 and then not In_Task_Activation
1594 then
1595 null;
1597 -- If we have the instantiation case we are done, since we now
1598 -- know that the body of the generic appeared earlier.
1600 elsif Inst_Case then
1601 return;
1603 -- Otherwise we have a call, so we trace through the called
1604 -- body to see if it has any problems ..
1606 else
1607 pragma Assert (Nkind (Sbody) = N_Subprogram_Body);
1609 Elab_Call.Increment_Last;
1610 Elab_Call.Table (Elab_Call.Last).Cloc := Loc;
1611 Elab_Call.Table (Elab_Call.Last).Ent := E;
1613 if Debug_Flag_LL then
1614 Write_Str ("Elab_Call.Last = ");
1615 Write_Int (Int (Elab_Call.Last));
1616 Write_Str (" Ent = ");
1617 Write_Name (Chars (E));
1618 Write_Str (" at ");
1619 Write_Location (Sloc (N));
1620 Write_Eol;
1621 end if;
1623 -- Now traverse declarations and statements of subprogram body.
1624 -- Note that we cannot simply Traverse (Sbody), since traverse
1625 -- does not normally visit subprogram bodies.
1627 declare
1628 Decl : Node_Id := First (Declarations (Sbody));
1630 begin
1631 while Present (Decl) loop
1632 Traverse (Decl);
1633 Next (Decl);
1634 end loop;
1635 end;
1637 Traverse (Handled_Statement_Sequence (Sbody));
1639 Elab_Call.Decrement_Last;
1640 return;
1641 end if;
1643 -- Here is the case of calling a subprogram where the body has
1644 -- not yet been encountered, a warning message is needed.
1646 -- If we have nothing in the call stack, then this is at the
1647 -- outer level, and the ABE is bound to occur.
1649 if Elab_Call.Last = 0 then
1650 if Inst_Case then
1651 Error_Msg_NE
1652 ("?cannot instantiate& before body seen", N, Orig_Ent);
1653 else
1654 Error_Msg_NE
1655 ("?cannot call& before body seen", N, Orig_Ent);
1656 end if;
1658 Error_Msg_N
1659 ("\?Program_Error will be raised at run time", N);
1660 Insert_Elab_Check (N);
1662 -- Call is not at outer level
1664 else
1665 -- Deal with dynamic elaboration check
1667 if not Elaboration_Checks_Suppressed (E) then
1668 Set_Elaboration_Entity_Required (E);
1670 -- Case of no elaboration entity allocated yet
1672 if No (Elaboration_Entity (E)) then
1674 -- Create object declaration for elaboration entity, and put it
1675 -- just in front of the spec of the subprogram or generic unit,
1676 -- in the same scope as this unit.
1678 declare
1679 Loce : constant Source_Ptr := Sloc (E);
1680 Ent : constant Entity_Id :=
1681 Make_Defining_Identifier (Loc,
1682 Chars => New_External_Name (Chars (E), 'E'));
1684 begin
1685 Set_Elaboration_Entity (E, Ent);
1686 New_Scope (Scope (E));
1688 Insert_Action (Declaration_Node (E),
1689 Make_Object_Declaration (Loce,
1690 Defining_Identifier => Ent,
1691 Object_Definition =>
1692 New_Occurrence_Of (Standard_Boolean, Loce),
1693 Expression => New_Occurrence_Of (Standard_False, Loce)));
1695 -- Set elaboration flag at the point of the body
1697 Set_Elaboration_Flag (Sbody, E);
1699 -- Kill current value indication. This is necessary
1700 -- because the tests of this flag are inserted out of
1701 -- sequence and must not pick up bogus indications of
1702 -- the wrong constant value. Also, this is never a true
1703 -- constant, since one way or another, it gets reset.
1705 Set_Current_Value (Ent, Empty);
1706 Set_Is_True_Constant (Ent, False);
1707 Pop_Scope;
1708 end;
1709 end if;
1711 -- Generate check of the elaboration Boolean
1713 Insert_Elab_Check (N,
1714 New_Occurrence_Of (Elaboration_Entity (E), Loc));
1715 end if;
1717 -- Generate the warning
1719 if not Suppress_Elaboration_Warnings (E)
1720 and then not Elaboration_Checks_Suppressed (E)
1721 then
1722 if Inst_Case then
1723 Error_Msg_NE
1724 ("instantiation of& may occur before body is seen?",
1725 N, Orig_Ent);
1726 else
1727 Error_Msg_NE
1728 ("call to& may occur before body is seen?", N, Orig_Ent);
1729 end if;
1731 Error_Msg_N
1732 ("\Program_Error may be raised at run time?", N);
1734 Output_Calls (N);
1735 end if;
1736 end if;
1738 -- Set flag to suppress further warnings on same subprogram
1739 -- unless in all errors mode
1741 if not All_Errors_Mode then
1742 Set_Suppress_Elaboration_Warnings (E);
1743 end if;
1744 end Check_Internal_Call_Continue;
1746 ---------------------------
1747 -- Check_Task_Activation --
1748 ---------------------------
1750 procedure Check_Task_Activation (N : Node_Id) is
1751 Loc : constant Source_Ptr := Sloc (N);
1752 Inter_Procs : constant Elist_Id := New_Elmt_List;
1753 Intra_Procs : constant Elist_Id := New_Elmt_List;
1754 Ent : Entity_Id;
1755 P : Entity_Id;
1756 Task_Scope : Entity_Id;
1757 Cunit_SC : Boolean := False;
1758 Decl : Node_Id;
1759 Elmt : Elmt_Id;
1760 Enclosing : Entity_Id;
1762 procedure Add_Task_Proc (Typ : Entity_Id);
1763 -- Add to Task_Procs the task body procedure(s) of task types in Typ.
1764 -- For record types, this procedure recurses over component types.
1766 procedure Collect_Tasks (Decls : List_Id);
1767 -- Collect the types of the tasks that are to be activated in the given
1768 -- list of declarations, in order to perform elaboration checks on the
1769 -- corresponding task procedures which are called implicitly here.
1771 function Outer_Unit (E : Entity_Id) return Entity_Id;
1772 -- find enclosing compilation unit of Entity, ignoring subunits, or
1773 -- else enclosing subprogram. If E is not a package, there is no need
1774 -- for inter-unit elaboration checks.
1776 -------------------
1777 -- Add_Task_Proc --
1778 -------------------
1780 procedure Add_Task_Proc (Typ : Entity_Id) is
1781 Comp : Entity_Id;
1782 Proc : Entity_Id := Empty;
1784 begin
1785 if Is_Task_Type (Typ) then
1786 Proc := Get_Task_Body_Procedure (Typ);
1788 elsif Is_Array_Type (Typ)
1789 and then Has_Task (Base_Type (Typ))
1790 then
1791 Add_Task_Proc (Component_Type (Typ));
1793 elsif Is_Record_Type (Typ)
1794 and then Has_Task (Base_Type (Typ))
1795 then
1796 Comp := First_Component (Typ);
1798 while Present (Comp) loop
1799 Add_Task_Proc (Etype (Comp));
1800 Comp := Next_Component (Comp);
1801 end loop;
1802 end if;
1804 -- If the task type is another unit, we will perform the usual
1805 -- elaboration check on its enclosing unit. If the type is in the
1806 -- same unit, we can trace the task body as for an internal call,
1807 -- but we only need to examine other external calls, because at
1808 -- the point the task is activated, internal subprogram bodies
1809 -- will have been elaborated already. We keep separate lists for
1810 -- each kind of task.
1812 -- Skip this test if errors have occurred, since in this case
1813 -- we can get false indications.
1815 if Serious_Errors_Detected /= 0 then
1816 return;
1817 end if;
1819 if Present (Proc) then
1820 if Outer_Unit (Scope (Proc)) = Enclosing then
1822 if No (Corresponding_Body (Unit_Declaration_Node (Proc)))
1823 and then
1824 (not Is_Generic_Instance (Scope (Proc))
1825 or else
1826 Scope (Proc) = Scope (Defining_Identifier (Decl)))
1827 then
1828 Error_Msg_N
1829 ("task will be activated before elaboration of its body?",
1830 Decl);
1831 Error_Msg_N
1832 ("Program_Error will be raised at run-time?", Decl);
1834 elsif
1835 Present (Corresponding_Body (Unit_Declaration_Node (Proc)))
1836 then
1837 Append_Elmt (Proc, Intra_Procs);
1838 end if;
1840 else
1841 Elmt := First_Elmt (Inter_Procs);
1843 -- No need for multiple entries of the same type.
1845 while Present (Elmt) loop
1846 if Node (Elmt) = Proc then
1847 return;
1848 end if;
1850 Next_Elmt (Elmt);
1851 end loop;
1853 Append_Elmt (Proc, Inter_Procs);
1854 end if;
1855 end if;
1856 end Add_Task_Proc;
1858 -------------------
1859 -- Collect_Tasks --
1860 -------------------
1862 procedure Collect_Tasks (Decls : List_Id) is
1863 begin
1864 if Present (Decls) then
1865 Decl := First (Decls);
1867 while Present (Decl) loop
1869 if Nkind (Decl) = N_Object_Declaration
1870 and then Has_Task (Etype (Defining_Identifier (Decl)))
1871 then
1872 Add_Task_Proc (Etype (Defining_Identifier (Decl)));
1873 end if;
1875 Next (Decl);
1876 end loop;
1877 end if;
1878 end Collect_Tasks;
1880 ----------------
1881 -- Outer_Unit --
1882 ----------------
1884 function Outer_Unit (E : Entity_Id) return Entity_Id is
1885 Outer : Entity_Id := E;
1887 begin
1888 while Present (Outer) loop
1889 if Elaboration_Checks_Suppressed (Outer) then
1890 Cunit_SC := True;
1891 end if;
1893 exit when Is_Child_Unit (Outer)
1894 or else Scope (Outer) = Standard_Standard
1895 or else Ekind (Outer) /= E_Package;
1896 Outer := Scope (Outer);
1897 end loop;
1899 return Outer;
1900 end Outer_Unit;
1902 -- Start of processing for Check_Task_Activation
1904 begin
1905 Enclosing := Outer_Unit (Current_Scope);
1907 -- Find all tasks declared in the current unit.
1909 if Nkind (N) = N_Package_Body then
1910 P := Unit_Declaration_Node (Corresponding_Spec (N));
1912 Collect_Tasks (Declarations (N));
1913 Collect_Tasks (Visible_Declarations (Specification (P)));
1914 Collect_Tasks (Private_Declarations (Specification (P)));
1916 elsif Nkind (N) = N_Package_Declaration then
1917 Collect_Tasks (Visible_Declarations (Specification (N)));
1918 Collect_Tasks (Private_Declarations (Specification (N)));
1920 else
1921 Collect_Tasks (Declarations (N));
1922 end if;
1924 -- We only perform detailed checks in all tasks are library level
1925 -- entities. If the master is a subprogram or task, activation will
1926 -- depend on the activation of the master itself.
1927 -- Should dynamic checks be added in the more general case???
1929 if Ekind (Enclosing) /= E_Package then
1930 return;
1931 end if;
1933 -- For task types defined in other units, we want the unit containing
1934 -- the task body to be elaborated before the current one.
1936 Elmt := First_Elmt (Inter_Procs);
1938 while Present (Elmt) loop
1939 Ent := Node (Elmt);
1940 Task_Scope := Outer_Unit (Scope (Ent));
1942 if not Is_Compilation_Unit (Task_Scope) then
1943 null;
1945 elsif Suppress_Elaboration_Warnings (Task_Scope)
1946 or else Elaboration_Checks_Suppressed (Task_Scope)
1947 then
1948 null;
1950 elsif Dynamic_Elaboration_Checks then
1951 if not Elaboration_Checks_Suppressed (Ent)
1952 and then not Cunit_SC
1953 and then
1954 not Restriction_Active (No_Entry_Calls_In_Elaboration_Code)
1955 then
1956 -- Runtime elaboration check required. generate check of the
1957 -- elaboration Boolean for the unit containing the entity.
1959 Insert_Elab_Check (N,
1960 Make_Attribute_Reference (Loc,
1961 Attribute_Name => Name_Elaborated,
1962 Prefix =>
1963 New_Occurrence_Of
1964 (Spec_Entity (Task_Scope), Loc)));
1965 end if;
1967 else
1968 -- Force the binder to elaborate other unit first
1970 if not Suppress_Elaboration_Warnings (Ent)
1971 and then not Elaboration_Checks_Suppressed (Ent)
1972 and then Elab_Warnings
1973 and then not Suppress_Elaboration_Warnings (Task_Scope)
1974 and then not Elaboration_Checks_Suppressed (Task_Scope)
1975 then
1976 Error_Msg_Node_2 := Task_Scope;
1977 Error_Msg_NE ("activation of an instance of task type&" &
1978 " requires pragma Elaborate_All on &?", N, Ent);
1979 end if;
1981 Set_Elaborate_All_Desirable (Task_Scope);
1982 Set_Suppress_Elaboration_Warnings (Task_Scope);
1983 end if;
1985 Next_Elmt (Elmt);
1986 end loop;
1988 -- For tasks declared in the current unit, trace other calls within
1989 -- the task procedure bodies, which are available.
1991 In_Task_Activation := True;
1992 Elmt := First_Elmt (Intra_Procs);
1994 while Present (Elmt) loop
1995 Ent := Node (Elmt);
1996 Check_Internal_Call_Continue (N, Ent, Enclosing, Ent);
1997 Next_Elmt (Elmt);
1998 end loop;
2000 In_Task_Activation := False;
2001 end Check_Task_Activation;
2003 ----------------------
2004 -- Has_Generic_Body --
2005 ----------------------
2007 function Has_Generic_Body (N : Node_Id) return Boolean is
2008 Ent : constant Entity_Id := Get_Generic_Entity (N);
2009 Decl : constant Node_Id := Unit_Declaration_Node (Ent);
2010 Scop : Entity_Id;
2012 function Find_Body_In (E : Entity_Id; N : Node_Id) return Node_Id;
2013 -- Determine if the list of nodes headed by N and linked by Next
2014 -- contains a package body for the package spec entity E, and if
2015 -- so return the package body. If not, then returns Empty.
2017 function Load_Package_Body (Nam : Unit_Name_Type) return Node_Id;
2018 -- This procedure is called load the unit whose name is given by Nam.
2019 -- This unit is being loaded to see whether it contains an optional
2020 -- generic body. The returned value is the loaded unit, which is
2021 -- always a package body (only package bodies can contain other
2022 -- entities in the sense in which Has_Generic_Body is interested).
2023 -- We only attempt to load bodies if we are generating code. If we
2024 -- are in semantics check only mode, then it would be wrong to load
2025 -- bodies that are not required from a semantic point of view, so
2026 -- in this case we return Empty. The result is that the caller may
2027 -- incorrectly decide that a generic spec does not have a body when
2028 -- in fact it does, but the only harm in this is that some warnings
2029 -- on elaboration problems may be lost in semantic checks only mode,
2030 -- which is not big loss. We also return Empty if we go for a body
2031 -- and it is not there.
2033 function Locate_Corresponding_Body (PE : Entity_Id) return Node_Id;
2034 -- PE is the entity for a package spec. This function locates the
2035 -- corresponding package body, returning Empty if none is found.
2036 -- The package body returned is fully parsed but may not yet be
2037 -- analyzed, so only syntactic fields should be referenced.
2039 ------------------
2040 -- Find_Body_In --
2041 ------------------
2043 function Find_Body_In (E : Entity_Id; N : Node_Id) return Node_Id is
2044 Nod : Node_Id;
2046 begin
2047 Nod := N;
2048 while Present (Nod) loop
2050 -- If we found the package body we are looking for, return it
2052 if Nkind (Nod) = N_Package_Body
2053 and then Chars (Defining_Unit_Name (Nod)) = Chars (E)
2054 then
2055 return Nod;
2057 -- If we found the stub for the body, go after the subunit,
2058 -- loading it if necessary.
2060 elsif Nkind (Nod) = N_Package_Body_Stub
2061 and then Chars (Defining_Identifier (Nod)) = Chars (E)
2062 then
2063 if Present (Library_Unit (Nod)) then
2064 return Unit (Library_Unit (Nod));
2066 else
2067 return Load_Package_Body (Get_Unit_Name (Nod));
2068 end if;
2070 -- If neither package body nor stub, keep looking on chain
2072 else
2073 Next (Nod);
2074 end if;
2075 end loop;
2077 return Empty;
2078 end Find_Body_In;
2080 -----------------------
2081 -- Load_Package_Body --
2082 -----------------------
2084 function Load_Package_Body (Nam : Unit_Name_Type) return Node_Id is
2085 U : Unit_Number_Type;
2087 begin
2088 if Operating_Mode /= Generate_Code then
2089 return Empty;
2090 else
2091 U :=
2092 Load_Unit
2093 (Load_Name => Nam,
2094 Required => False,
2095 Subunit => False,
2096 Error_Node => N);
2098 if U = No_Unit then
2099 return Empty;
2100 else
2101 return Unit (Cunit (U));
2102 end if;
2103 end if;
2104 end Load_Package_Body;
2106 -------------------------------
2107 -- Locate_Corresponding_Body --
2108 -------------------------------
2110 function Locate_Corresponding_Body (PE : Entity_Id) return Node_Id is
2111 Spec : constant Node_Id := Declaration_Node (PE);
2112 Decl : constant Node_Id := Parent (Spec);
2113 Scop : constant Entity_Id := Scope (PE);
2114 PBody : Node_Id;
2116 begin
2117 if Is_Library_Level_Entity (PE) then
2119 -- If package is a library unit that requires a body, we have
2120 -- no choice but to go after that body because it might contain
2121 -- an optional body for the original generic package.
2123 if Unit_Requires_Body (PE) then
2125 -- Load the body. Note that we are a little careful here to
2126 -- use Spec to get the unit number, rather than PE or Decl,
2127 -- since in the case where the package is itself a library
2128 -- level instantiation, Spec will properly reference the
2129 -- generic template, which is what we really want.
2131 return
2132 Load_Package_Body
2133 (Get_Body_Name (Unit_Name (Get_Source_Unit (Spec))));
2135 -- But if the package is a library unit that does NOT require
2136 -- a body, then no body is permitted, so we are sure that there
2137 -- is no body for the original generic package.
2139 else
2140 return Empty;
2141 end if;
2143 -- Otherwise look and see if we are embedded in a further package
2145 elsif Is_Package (Scop) then
2147 -- If so, get the body of the enclosing package, and look in
2148 -- its package body for the package body we are looking for.
2150 PBody := Locate_Corresponding_Body (Scop);
2152 if No (PBody) then
2153 return Empty;
2154 else
2155 return Find_Body_In (PE, First (Declarations (PBody)));
2156 end if;
2158 -- If we are not embedded in a further package, then the body
2159 -- must be in the same declarative part as we are.
2161 else
2162 return Find_Body_In (PE, Next (Decl));
2163 end if;
2164 end Locate_Corresponding_Body;
2166 -- Start of processing for Has_Generic_Body
2168 begin
2169 if Present (Corresponding_Body (Decl)) then
2170 return True;
2172 elsif Unit_Requires_Body (Ent) then
2173 return True;
2175 -- Compilation units cannot have optional bodies
2177 elsif Is_Compilation_Unit (Ent) then
2178 return False;
2180 -- Otherwise look at what scope we are in
2182 else
2183 Scop := Scope (Ent);
2185 -- Case of entity is in other than a package spec, in this case
2186 -- the body, if present, must be in the same declarative part.
2188 if not Is_Package (Scop) then
2189 declare
2190 P : Node_Id;
2192 begin
2193 P := Declaration_Node (Ent);
2195 -- Declaration node may get us a spec, so if so, go to
2196 -- the parent declaration.
2198 while not Is_List_Member (P) loop
2199 P := Parent (P);
2200 end loop;
2202 return Present (Find_Body_In (Ent, Next (P)));
2203 end;
2205 -- If the entity is in a package spec, then we have to locate
2206 -- the corresponding package body, and look there.
2208 else
2209 declare
2210 PBody : constant Node_Id := Locate_Corresponding_Body (Scop);
2212 begin
2213 if No (PBody) then
2214 return False;
2215 else
2216 return
2217 Present
2218 (Find_Body_In (Ent, (First (Declarations (PBody)))));
2219 end if;
2220 end;
2221 end if;
2222 end if;
2223 end Has_Generic_Body;
2225 -----------------------
2226 -- Insert_Elab_Check --
2227 -----------------------
2229 procedure Insert_Elab_Check (N : Node_Id; C : Node_Id := Empty) is
2230 Nod : Node_Id;
2231 Loc : constant Source_Ptr := Sloc (N);
2233 begin
2234 -- If expansion is disabled, do not generate any checks. Also
2235 -- skip checks if any subunits are missing because in either
2236 -- case we lack the full information that we need, and no object
2237 -- file will be created in any case.
2239 if not Expander_Active or else Subunits_Missing then
2240 return;
2241 end if;
2243 -- If we have a generic instantiation, where Instance_Spec is set,
2244 -- then this field points to a generic instance spec that has
2245 -- been inserted before the instantiation node itself, so that
2246 -- is where we want to insert a check.
2248 if Nkind (N) in N_Generic_Instantiation
2249 and then Present (Instance_Spec (N))
2250 then
2251 Nod := Instance_Spec (N);
2252 else
2253 Nod := N;
2254 end if;
2256 -- If we are inserting at the top level, insert in Aux_Decls
2258 if Nkind (Parent (Nod)) = N_Compilation_Unit then
2259 declare
2260 ADN : constant Node_Id := Aux_Decls_Node (Parent (Nod));
2261 R : Node_Id;
2263 begin
2264 if No (C) then
2265 R :=
2266 Make_Raise_Program_Error (Loc,
2267 Reason => PE_Access_Before_Elaboration);
2268 else
2269 R :=
2270 Make_Raise_Program_Error (Loc,
2271 Condition => Make_Op_Not (Loc, C),
2272 Reason => PE_Access_Before_Elaboration);
2273 end if;
2275 if No (Declarations (ADN)) then
2276 Set_Declarations (ADN, New_List (R));
2277 else
2278 Append_To (Declarations (ADN), R);
2279 end if;
2281 Analyze (R);
2282 end;
2284 -- Otherwise just insert before the node in question. However, if
2285 -- the context of the call has already been analyzed, an insertion
2286 -- will not work if it depends on subsequent expansion (e.g. a call in
2287 -- a branch of a short-circuit). In that case we replace the call with
2288 -- a conditional expression, or with a Raise if it is unconditional.
2289 -- Unfortunately this does not work if the call has a dynamic size,
2290 -- because gigi regards it as a dynamic-sized temporary. If such a call
2291 -- appears in a short-circuit expression, the elaboration check will be
2292 -- missed (rare enough ???). Otherwise, the code below inserts the check
2293 -- at the appropriate place before the call. Same applies in the even
2294 -- rarer case the return type has a known size but is unconstrained.
2296 else
2297 if Nkind (N) = N_Function_Call
2298 and then Analyzed (Parent (N))
2299 and then Size_Known_At_Compile_Time (Etype (N))
2300 and then
2301 (not Has_Discriminants (Etype (N))
2302 or else Is_Constrained (Etype (N)))
2304 then
2305 declare
2306 Typ : constant Entity_Id := Etype (N);
2307 Chk : constant Boolean := Do_Range_Check (N);
2309 R : constant Node_Id :=
2310 Make_Raise_Program_Error (Loc,
2311 Reason => PE_Access_Before_Elaboration);
2313 begin
2314 Set_Etype (R, Typ);
2316 if No (C) then
2317 Rewrite (N, R);
2319 else
2320 Rewrite (N,
2321 Make_Conditional_Expression (Loc,
2322 Expressions => New_List (C, Relocate_Node (N), R)));
2323 end if;
2325 Analyze_And_Resolve (N, Typ);
2327 -- If the original call requires a range check, so does the
2328 -- conditional expression.
2330 if Chk then
2331 Enable_Range_Check (N);
2332 else
2333 Set_Do_Range_Check (N, False);
2334 end if;
2335 end;
2337 else
2338 if No (C) then
2339 Insert_Action (Nod,
2340 Make_Raise_Program_Error (Loc,
2341 Reason => PE_Access_Before_Elaboration));
2342 else
2343 Insert_Action (Nod,
2344 Make_Raise_Program_Error (Loc,
2345 Condition =>
2346 Make_Op_Not (Loc,
2347 Right_Opnd => C),
2348 Reason => PE_Access_Before_Elaboration));
2349 end if;
2350 end if;
2351 end if;
2352 end Insert_Elab_Check;
2354 ------------------
2355 -- Output_Calls --
2356 ------------------
2358 procedure Output_Calls (N : Node_Id) is
2359 Ent : Entity_Id;
2361 function Is_Printable_Error_Name (Nm : Name_Id) return Boolean;
2362 -- An internal function, used to determine if a name, Nm, is either
2363 -- a non-internal name, or is an internal name that is printable
2364 -- by the error message circuits (i.e. it has a single upper
2365 -- case letter at the end).
2367 function Is_Printable_Error_Name (Nm : Name_Id) return Boolean is
2368 begin
2369 if not Is_Internal_Name (Nm) then
2370 return True;
2372 elsif Name_Len = 1 then
2373 return False;
2375 else
2376 Name_Len := Name_Len - 1;
2377 return not Is_Internal_Name;
2378 end if;
2379 end Is_Printable_Error_Name;
2381 -- Start of processing for Output_Calls
2383 begin
2384 for J in reverse 1 .. Elab_Call.Last loop
2385 Error_Msg_Sloc := Elab_Call.Table (J).Cloc;
2387 Ent := Elab_Call.Table (J).Ent;
2389 if Is_Generic_Unit (Ent) then
2390 Error_Msg_NE ("\?& instantiated #", N, Ent);
2392 elsif Is_Init_Proc (Ent) then
2393 Error_Msg_N ("\?initialization procedure called #", N);
2395 elsif Is_Printable_Error_Name (Chars (Ent)) then
2396 Error_Msg_NE ("\?& called #", N, Ent);
2398 else
2399 Error_Msg_N ("\? called #", N);
2400 end if;
2401 end loop;
2402 end Output_Calls;
2404 ----------------------------
2405 -- Same_Elaboration_Scope --
2406 ----------------------------
2408 function Same_Elaboration_Scope (Scop1, Scop2 : Entity_Id) return Boolean is
2409 S1 : Entity_Id := Scop1;
2410 S2 : Entity_Id := Scop2;
2412 begin
2413 while S1 /= Standard_Standard
2414 and then (Ekind (S1) = E_Package
2415 or else
2416 Ekind (S1) = E_Block)
2417 loop
2418 S1 := Scope (S1);
2419 end loop;
2421 while S2 /= Standard_Standard
2422 and then (Ekind (S2) = E_Package
2423 or else
2424 Ekind (S2) = E_Protected_Type
2425 or else
2426 Ekind (S2) = E_Block)
2427 loop
2428 S2 := Scope (S2);
2429 end loop;
2431 return S1 = S2;
2432 end Same_Elaboration_Scope;
2434 -----------------
2435 -- Set_C_Scope --
2436 -----------------
2438 procedure Set_C_Scope is
2439 begin
2440 while not Is_Compilation_Unit (C_Scope) loop
2441 C_Scope := Scope (C_Scope);
2442 end loop;
2443 end Set_C_Scope;
2445 -----------------
2446 -- Spec_Entity --
2447 -----------------
2449 function Spec_Entity (E : Entity_Id) return Entity_Id is
2450 Decl : Node_Id;
2452 begin
2453 -- Check for case of body entity
2454 -- Why is the check for E_Void needed???
2456 if Ekind (E) = E_Void
2457 or else Ekind (E) = E_Subprogram_Body
2458 or else Ekind (E) = E_Package_Body
2459 then
2460 Decl := E;
2462 loop
2463 Decl := Parent (Decl);
2464 exit when Nkind (Decl) in N_Proper_Body;
2465 end loop;
2467 return Corresponding_Spec (Decl);
2469 else
2470 return E;
2471 end if;
2472 end Spec_Entity;
2474 -------------------
2475 -- Supply_Bodies --
2476 -------------------
2478 procedure Supply_Bodies (N : Node_Id) is
2479 begin
2480 if Nkind (N) = N_Subprogram_Declaration then
2481 declare
2482 Ent : constant Entity_Id := Defining_Unit_Name (Specification (N));
2484 begin
2485 Set_Is_Imported (Ent);
2486 Set_Convention (Ent, Convention_Stubbed);
2487 end;
2489 elsif Nkind (N) = N_Package_Declaration then
2490 declare
2491 Spec : constant Node_Id := Specification (N);
2493 begin
2494 New_Scope (Defining_Unit_Name (Spec));
2495 Supply_Bodies (Visible_Declarations (Spec));
2496 Supply_Bodies (Private_Declarations (Spec));
2497 Pop_Scope;
2498 end;
2499 end if;
2500 end Supply_Bodies;
2502 procedure Supply_Bodies (L : List_Id) is
2503 Elmt : Node_Id;
2505 begin
2506 if Present (L) then
2507 Elmt := First (L);
2508 while Present (Elmt) loop
2509 Supply_Bodies (Elmt);
2510 Next (Elmt);
2511 end loop;
2512 end if;
2513 end Supply_Bodies;
2515 ------------
2516 -- Within --
2517 ------------
2519 function Within (E1, E2 : Entity_Id) return Boolean is
2520 Scop : Entity_Id;
2522 begin
2523 Scop := E1;
2525 loop
2526 if Scop = E2 then
2527 return True;
2529 elsif Scop = Standard_Standard then
2530 return False;
2532 else
2533 Scop := Scope (Scop);
2534 end if;
2535 end loop;
2537 raise Program_Error;
2538 end Within;
2540 --------------------------
2541 -- Within_Elaborate_All --
2542 --------------------------
2544 function Within_Elaborate_All (E : Entity_Id) return Boolean is
2545 Item : Node_Id;
2546 Item2 : Node_Id;
2547 Elab_Id : Entity_Id;
2548 Par : Node_Id;
2550 begin
2551 Item := First (Context_Items (Cunit (Current_Sem_Unit)));
2553 while Present (Item) loop
2554 if Nkind (Item) = N_Pragma
2555 and then Get_Pragma_Id (Chars (Item)) = Pragma_Elaborate_All
2556 then
2557 if Error_Posted (Item) then
2559 -- Some previous error on the pragma itself
2561 return False;
2562 end if;
2564 Elab_Id :=
2565 Entity (
2566 Expression (First (Pragma_Argument_Associations (Item))));
2568 Par := Parent (Unit_Declaration_Node (Elab_Id));
2569 Item2 := First (Context_Items (Par));
2571 while Present (Item2) loop
2572 if Nkind (Item2) = N_With_Clause
2573 and then Entity (Name (Item2)) = E
2574 then
2575 return True;
2576 end if;
2578 Next (Item2);
2579 end loop;
2580 end if;
2582 Next (Item);
2583 end loop;
2585 return False;
2586 end Within_Elaborate_All;
2588 end Sem_Elab;