1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1997-2015, 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 3, 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 COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree; use Atree;
27 with Checks; use Checks;
28 with Debug; use Debug;
29 with Einfo; use Einfo;
30 with Elists; use Elists;
31 with Errout; use Errout;
32 with Exp_Tss; use Exp_Tss;
33 with Exp_Util; use Exp_Util;
34 with Expander; use Expander;
35 with Fname; use Fname;
37 with Lib.Load; use Lib.Load;
38 with Namet; use Namet;
39 with Nlists; use Nlists;
40 with Nmake; use Nmake;
42 with Output; use Output;
43 with Restrict; use Restrict;
44 with Rident; use Rident;
46 with Sem_Aux; use Sem_Aux;
47 with Sem_Cat; use Sem_Cat;
48 with Sem_Ch7; use Sem_Ch7;
49 with Sem_Ch8; use Sem_Ch8;
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 Uintp; use Uintp;
58 with Uname; use Uname;
60 package body Sem_Elab is
62 -- The following table records the recursive call chain for output in the
63 -- Output routine. Each entry records the call node and the entity of the
64 -- called routine. The number of entries in the table (i.e. the value of
65 -- Elab_Call.Last) indicates the current depth of recursion and is used to
66 -- identify the outer level.
68 type Elab_Call_Entry is record
73 package Elab_Call is new Table.Table (
74 Table_Component_Type => Elab_Call_Entry,
75 Table_Index_Type => Int,
78 Table_Increment => 100,
79 Table_Name => "Elab_Call");
81 -- This table is initialized at the start of each outer level call. It
82 -- holds the entities for all subprograms that have been examined for this
83 -- particular outer level call, and is used to prevent both infinite
84 -- 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,
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
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).
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
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
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. Compute this only once at the outer
132 -- level, i.e. for a call to Check_Elab_Call from outside this unit.
134 Outer_Level_Sloc : Source_Ptr;
135 -- Save Sloc value for outer level call node for comparisons of source
136 -- locations. A body is too late if it appears after the *outer* level
137 -- call, not the particular call that is being analyzed.
139 From_Elab_Code : Boolean;
140 -- This flag shows whether the outer level call currently being examined
141 -- is or is not in elaboration code. We are only interested in calls to
142 -- routines in other units if this flag is True.
144 In_Task_Activation : Boolean := False;
145 -- This flag indicates whether we are performing elaboration checks on
146 -- task procedures, at the point of activation. If true, we do not trace
147 -- internal calls in these procedures, because all local bodies are known
150 Delaying_Elab_Checks : Boolean := True;
151 -- This is set True till the compilation is complete, including the
152 -- insertion of all instance bodies. Then when Check_Elab_Calls is called,
153 -- the delay table is used to make the delayed calls and this flag is reset
154 -- to False, so that the calls are processed.
156 -----------------------
157 -- Local Subprograms --
158 -----------------------
160 -- Note: Outer_Scope in all following specs represents the scope of
161 -- interest of the outer level call. If it is set to Standard_Standard,
162 -- then it means the outer level call was at elaboration level, and that
163 -- thus all calls are of interest. If it was set to some other scope,
164 -- then the original call was an inner call, and we are not interested
165 -- in calls that go outside this scope.
167 procedure Activate_Elaborate_All_Desirable (N : Node_Id; U : Entity_Id);
168 -- Analysis of construct N shows that we should set Elaborate_All_Desirable
169 -- for the WITH clause for unit U (which will always be present). A special
170 -- case is when N is a function or procedure instantiation, in which case
171 -- it is sufficient to set Elaborate_Desirable, since in this case there is
172 -- no possibility of transitive elaboration issues.
174 procedure Check_A_Call
177 Outer_Scope : Entity_Id;
178 Inter_Unit_Only : Boolean;
179 Generate_Warnings : Boolean := True;
180 In_Init_Proc : Boolean := False);
181 -- This is the internal recursive routine that is called to check for
182 -- possible elaboration error. The argument N is a subprogram call or
183 -- generic instantiation, or 'Access attribute reference to be checked, and
184 -- E is the entity of the called subprogram, or instantiated generic unit,
185 -- or subprogram referenced by 'Access.
187 -- In SPARK mode, N can also be a variable reference, since in SPARK this
188 -- also triggers a requirement for Elaborate_All, and in this case E is the
189 -- entity being referenced.
191 -- Outer_Scope is the outer level scope for the original reference.
192 -- Inter_Unit_Only is set if the call is only to be checked in the
193 -- case where it is to another unit (and skipped if within a unit).
194 -- Generate_Warnings is set to False to suppress warning messages about
195 -- missing pragma Elaborate_All's. These messages are not wanted for
196 -- inner calls in the dynamic model. Note that an instance of the Access
197 -- attribute applied to a subprogram also generates a call to this
198 -- procedure (since the referenced subprogram may be called later
199 -- indirectly). Flag In_Init_Proc should be set whenever the current
200 -- context is a type init proc.
202 -- Note: this might better be called Check_A_Reference to recognize the
203 -- variable case for SPARK, but we prefer to retain the historical name
204 -- since in practice this is mostly about checking calls for the possible
205 -- occurrence of an access-before-elaboration exception.
207 procedure Check_Bad_Instantiation (N : Node_Id);
208 -- N is a node for an instantiation (if called with any other node kind,
209 -- Check_Bad_Instantiation ignores the call). This subprogram checks for
210 -- the special case of a generic instantiation of a generic spec in the
211 -- same declarative part as the instantiation where a body is present and
212 -- has not yet been seen. This is an obvious error, but needs to be checked
213 -- specially at the time of the instantiation, since it is a case where we
214 -- cannot insert the body anywhere. If this case is detected, warnings are
215 -- generated, and a raise of Program_Error is inserted. In addition any
216 -- subprograms in the generic spec are stubbed, and the Bad_Instantiation
217 -- flag is set on the instantiation node. The caller in Sem_Ch12 uses this
218 -- flag as an indication that no attempt should be made to insert an
221 procedure Check_Internal_Call
224 Outer_Scope : Entity_Id;
225 Orig_Ent : Entity_Id);
226 -- N is a function call or procedure statement call node and E is the
227 -- entity of the called function, which is within the current compilation
228 -- unit (where subunits count as part of the parent). This call checks if
229 -- this call, or any call within any accessed body could cause an ABE, and
230 -- if so, outputs a warning. Orig_Ent differs from E only in the case of
231 -- renamings, and points to the original name of the entity. This is used
232 -- for error messages. Outer_Scope is the outer level scope for the
235 procedure Check_Internal_Call_Continue
238 Outer_Scope : Entity_Id;
239 Orig_Ent : Entity_Id);
240 -- The processing for Check_Internal_Call is divided up into two phases,
241 -- and this represents the second phase. The second phase is delayed if
242 -- Delaying_Elab_Calls is set to True. In this delayed case, the first
243 -- phase makes an entry in the Delay_Check table, which is processed when
244 -- Check_Elab_Calls is called. N, E and Orig_Ent are as for the call to
245 -- Check_Internal_Call. Outer_Scope is the outer level scope for the
248 function Has_Generic_Body (N : Node_Id) return Boolean;
249 -- N is a generic package instantiation node, and this routine determines
250 -- if this package spec does in fact have a generic body. If so, then
251 -- True is returned, otherwise False. Note that this is not at all the
252 -- same as checking if the unit requires a body, since it deals with
253 -- the case of optional bodies accurately (i.e. if a body is optional,
254 -- then it looks to see if a body is actually present). Note: this
255 -- function can only do a fully correct job if in generating code mode
256 -- where all bodies have to be present. If we are operating in semantics
257 -- check only mode, then in some cases of optional bodies, a result of
258 -- False may incorrectly be given. In practice this simply means that
259 -- some cases of warnings for incorrect order of elaboration will only
260 -- be given when generating code, which is not a big problem (and is
261 -- inevitable, given the optional body semantics of Ada).
263 procedure Insert_Elab_Check (N : Node_Id; C : Node_Id := Empty);
264 -- Given code for an elaboration check (or unconditional raise if the check
265 -- is not needed), inserts the code in the appropriate place. N is the call
266 -- or instantiation node for which the check code is required. C is the
267 -- test whose failure triggers the raise.
269 function Is_Call_Of_Generic_Formal (N : Node_Id) return Boolean;
270 -- Returns True if node N is a call to a generic formal subprogram
272 function Is_Finalization_Procedure (Id : Entity_Id) return Boolean;
273 -- Determine whether entity Id denotes a [Deep_]Finalize procedure
275 procedure Output_Calls
277 Check_Elab_Flag : Boolean);
278 -- Outputs chain of calls stored in the Elab_Call table. The caller has
279 -- already generated the main warning message, so the warnings generated
280 -- are all continuation messages. The argument is the call node at which
281 -- the messages are to be placed. When Check_Elab_Flag is set, calls are
282 -- enumerated only when flag Elab_Warning is set for the dynamic case or
283 -- when flag Elab_Info_Messages is set for the static case.
285 function Same_Elaboration_Scope (Scop1, Scop2 : Entity_Id) return Boolean;
286 -- Given two scopes, determine whether they are the same scope from an
287 -- elaboration point of view, i.e. packages and blocks are ignored.
289 procedure Set_C_Scope;
290 -- On entry C_Scope is set to some scope. On return, C_Scope is reset
291 -- to be the enclosing compilation unit of this scope.
293 function Get_Referenced_Ent (N : Node_Id) return Entity_Id;
294 -- N is either a function or procedure call or an access attribute that
295 -- references a subprogram. This call retrieves the relevant entity. If
296 -- this is a call to a protected subprogram, the entity is a selected
297 -- component. The callable entity may be absent, in which case Empty is
298 -- returned. This happens with non-analyzed calls in nested generics.
300 -- If SPARK_Mode is On, then N can also be a reference to an E_Variable
301 -- entity, in which case, the value returned is simply this entity.
303 procedure Set_Elaboration_Constraint
307 -- The current unit U may depend semantically on some unit P which is not
308 -- in the current context. If there is an elaboration call that reaches P,
309 -- we need to indicate that P requires an Elaborate_All, but this is not
310 -- effective in U's ali file, if there is no with_clause for P. In this
311 -- case we add the Elaborate_All on the unit Q that directly or indirectly
312 -- makes P available. This can happen in two cases:
314 -- a) Q declares a subtype of a type declared in P, and the call is an
315 -- initialization call for an object of that subtype.
317 -- b) Q declares an object of some tagged type whose root type is
318 -- declared in P, and the initialization call uses object notation on
319 -- that object to reach a primitive operation or a classwide operation
322 -- If P appears in the context of U, the current processing is correct.
323 -- Otherwise we must identify these two cases to retrieve Q and place the
324 -- Elaborate_All_Desirable on it.
326 function Spec_Entity (E : Entity_Id) return Entity_Id;
327 -- Given a compilation unit entity, if it is a spec entity, it is returned
328 -- unchanged. If it is a body entity, then the spec for the corresponding
331 procedure Supply_Bodies (N : Node_Id);
332 -- Given a node, N, that is either a subprogram declaration or a package
333 -- declaration, this procedure supplies dummy bodies for the subprogram
334 -- or for all subprograms in the package. If the given node is not one of
335 -- these two possibilities, then Supply_Bodies does nothing. The dummy body
336 -- contains a single Raise statement.
338 procedure Supply_Bodies (L : List_Id);
339 -- Calls Supply_Bodies for all elements of the given list L
341 function Within (E1, E2 : Entity_Id) return Boolean;
342 -- Given two scopes E1 and E2, returns True if E1 is equal to E2, or is one
343 -- of its contained scopes, False otherwise.
345 function Within_Elaborate_All
346 (Unit : Unit_Number_Type;
347 E : Entity_Id) return Boolean;
348 -- Return True if we are within the scope of an Elaborate_All for E, or if
349 -- we are within the scope of an Elaborate_All for some other unit U, and U
350 -- with's E. This prevents spurious warnings when the called entity is
351 -- renamed within U, or in case of generic instances.
353 --------------------------------------
354 -- Activate_Elaborate_All_Desirable --
355 --------------------------------------
357 procedure Activate_Elaborate_All_Desirable (N : Node_Id; U : Entity_Id) is
358 UN : constant Unit_Number_Type := Get_Code_Unit (N);
359 CU : constant Node_Id := Cunit (UN);
360 UE : constant Entity_Id := Cunit_Entity (UN);
361 Unm : constant Unit_Name_Type := Unit_Name (UN);
362 CI : constant List_Id := Context_Items (CU);
366 procedure Add_To_Context_And_Mark (Itm : Node_Id);
367 -- This procedure is called when the elaborate indication must be
368 -- applied to a unit not in the context of the referencing unit. The
369 -- unit gets added to the context as an implicit with.
371 function In_Withs_Of (UEs : Entity_Id) return Boolean;
372 -- UEs is the spec entity of a unit. If the unit to be marked is
373 -- in the context item list of this unit spec, then the call returns
374 -- True and Itm is left set to point to the relevant N_With_Clause node.
376 procedure Set_Elab_Flag (Itm : Node_Id);
377 -- Sets Elaborate_[All_]Desirable as appropriate on Itm
379 -----------------------------
380 -- Add_To_Context_And_Mark --
381 -----------------------------
383 procedure Add_To_Context_And_Mark (Itm : Node_Id) is
384 CW : constant Node_Id :=
385 Make_With_Clause (Sloc (Itm),
389 Set_Library_Unit (CW, Library_Unit (Itm));
390 Set_Implicit_With (CW, True);
392 -- Set elaborate all desirable on copy and then append the copy to
393 -- the list of body with's and we are done.
397 end Add_To_Context_And_Mark;
403 function In_Withs_Of (UEs : Entity_Id) return Boolean is
404 UNs : constant Unit_Number_Type := Get_Source_Unit (UEs);
405 CUs : constant Node_Id := Cunit (UNs);
406 CIs : constant List_Id := Context_Items (CUs);
410 while Present (Itm) loop
411 if Nkind (Itm) = N_With_Clause then
413 Cunit_Entity (Get_Cunit_Unit_Number (Library_Unit (Itm)));
430 procedure Set_Elab_Flag (Itm : Node_Id) is
432 if Nkind (N) in N_Subprogram_Instantiation then
433 Set_Elaborate_Desirable (Itm);
435 Set_Elaborate_All_Desirable (Itm);
439 -- Start of processing for Activate_Elaborate_All_Desirable
442 -- Do not set binder indication if expansion is disabled, as when
443 -- compiling a generic unit.
445 if not Expander_Active then
450 while Present (Itm) loop
451 if Nkind (Itm) = N_With_Clause then
452 Ent := Cunit_Entity (Get_Cunit_Unit_Number (Library_Unit (Itm)));
454 -- If we find it, then mark elaborate all desirable and return
465 -- If we fall through then the with clause is not present in the
466 -- current unit. One legitimate possibility is that the with clause
467 -- is present in the spec when we are a body.
469 if Is_Body_Name (Unm)
470 and then In_Withs_Of (Spec_Entity (UE))
472 Add_To_Context_And_Mark (Itm);
476 -- Similarly, we may be in the spec or body of a child unit, where
477 -- the unit in question is with'ed by some ancestor of the child unit.
479 if Is_Child_Name (Unm) then
487 exit when Pkg = Standard_Standard;
489 if In_Withs_Of (Pkg) then
490 Add_To_Context_And_Mark (Itm);
497 -- Here if we do not find with clause on spec or body. We just ignore
498 -- this case, it means that the elaboration involves some other unit
499 -- than the unit being compiled, and will be caught elsewhere.
502 end Activate_Elaborate_All_Desirable;
508 procedure Check_A_Call
511 Outer_Scope : Entity_Id;
512 Inter_Unit_Only : Boolean;
513 Generate_Warnings : Boolean := True;
514 In_Init_Proc : Boolean := False)
516 Access_Case : constant Boolean := Nkind (N) = N_Attribute_Reference;
517 -- Indicates if we have Access attribute case
519 Variable_Case : constant Boolean :=
520 Nkind (N) in N_Has_Entity
521 and then Present (Entity (N))
522 and then Ekind (Entity (N)) = E_Variable;
523 -- Indicates if we have variable reference case
525 procedure Elab_Warning
528 Ent : Node_Or_Entity_Id);
529 -- Generate a call to Error_Msg_NE with parameters Msg_D or Msg_S (for
530 -- dynamic or static elaboration model), N and Ent. Msg_D is a real
531 -- warning (output if Msg_D is non-null and Elab_Warnings is set),
532 -- Msg_S is an info message (output if Elab_Info_Messages is set.
538 procedure Elab_Warning
541 Ent : Node_Or_Entity_Id)
544 -- Dynamic elaboration checks, real warning
546 if Dynamic_Elaboration_Checks then
547 if not Access_Case then
548 if Msg_D /= "" and then Elab_Warnings then
549 Error_Msg_NE (Msg_D, N, Ent);
552 -- In the access case emit first warning message as well,
553 -- otherwise list of calls will appear as errors.
555 elsif Elab_Warnings then
556 Error_Msg_NE (Msg_S, N, Ent);
559 -- Static elaboration checks, info message
562 if Elab_Info_Messages then
563 Error_Msg_NE (Msg_S, N, Ent);
570 Loc : constant Source_Ptr := Sloc (N);
572 Inst_Case : constant Boolean := Nkind (N) in N_Generic_Instantiation;
573 -- Indicates if we have instantiation case
576 Callee_Unit_Internal : Boolean;
577 Caller_Unit_Internal : Boolean;
579 Inst_Callee : Source_Ptr;
580 Inst_Caller : Source_Ptr;
581 Unit_Callee : Unit_Number_Type;
582 Unit_Caller : Unit_Number_Type;
584 Body_Acts_As_Spec : Boolean;
585 -- Set to true if call is to body acting as spec (no separate spec)
587 Cunit_SC : Boolean := False;
588 -- Set to suppress dynamic elaboration checks where one of the
589 -- enclosing scopes has Elaboration_Checks_Suppressed set, or else
590 -- if a pragma Elaborate[_All] applies to that scope, in which case
591 -- warnings on the scope are also suppressed. For the internal case,
592 -- we ignore this flag.
595 -- Top level scope of entity for called subprogram. This value includes
596 -- following renamings and derivations, so this scope can be in a
597 -- non-visible unit. This is the scope that is to be investigated to
598 -- see whether an elaboration check is required.
600 Is_DIC_Proc : Boolean := False;
601 -- Flag set when the call denotes the Default_Initial_Condition
602 -- procedure of a private type that wraps a nontrivial assertion
605 Issue_In_SPARK : Boolean;
606 -- Flag set when a source entity is called during elaboration in SPARK
609 -- Top level scope of directly called entity for subprogram. This
610 -- differs from E_Scope in the case where renamings or derivations
611 -- are involved, since it does not follow these links. W_Scope is
612 -- generally in a visible unit, and it is this scope that may require
613 -- an Elaborate_All. However, there are some cases (initialization
614 -- calls and calls involving object notation) where W_Scope might not
615 -- be in the context of the current unit, and there is an intermediate
616 -- package that is, in which case the Elaborate_All has to be placed
617 -- on this intermediate package. These special cases are handled in
618 -- Set_Elaboration_Constraint.
620 -- Start of processing for Check_A_Call
623 -- If the call is known to be within a local Suppress Elaboration
624 -- pragma, nothing to check. This can happen in task bodies. But
625 -- we ignore this for a call to a generic formal.
627 if Nkind (N) in N_Subprogram_Call
628 and then No_Elaboration_Check (N)
629 and then not Is_Call_Of_Generic_Formal (N)
634 -- If this is a rewrite of a Valid_Scalars attribute, then nothing to
635 -- check, we don't mind in this case if the call occurs before the body
636 -- since this is all generated code.
638 if Nkind (Original_Node (N)) = N_Attribute_Reference
639 and then Attribute_Name (Original_Node (N)) = Name_Valid_Scalars
644 -- Proceed with check
648 -- For a variable reference, just set Body_Acts_As_Spec to False
650 if Variable_Case then
651 Body_Acts_As_Spec := False;
653 -- Additional checks for all other cases
656 -- Go to parent for derived subprogram, or to original subprogram in
657 -- the case of a renaming (Alias covers both these cases).
660 if (Suppress_Elaboration_Warnings (Ent)
661 or else Elaboration_Checks_Suppressed (Ent))
662 and then (Inst_Case or else No (Alias (Ent)))
667 -- Nothing to do for imported entities
669 if Is_Imported (Ent) then
673 exit when Inst_Case or else No (Alias (Ent));
677 Decl := Unit_Declaration_Node (Ent);
679 if Nkind (Decl) = N_Subprogram_Body then
680 Body_Acts_As_Spec := True;
682 elsif Nkind_In (Decl, N_Subprogram_Declaration,
683 N_Subprogram_Body_Stub)
686 Body_Acts_As_Spec := False;
688 -- If we have none of an instantiation, subprogram body or subprogram
689 -- declaration, or in the SPARK case, a variable reference, then
690 -- it is not a case that we want to check. (One case is a call to a
691 -- generic formal subprogram, where we do not want the check in the
701 if Elaboration_Checks_Suppressed (E_Scope)
702 or else Suppress_Elaboration_Warnings (E_Scope)
707 -- Exit when we get to compilation unit, not counting subunits
709 exit when Is_Compilation_Unit (E_Scope)
710 and then (Is_Child_Unit (E_Scope)
711 or else Scope (E_Scope) = Standard_Standard);
713 -- If we did not find a compilation unit, other than standard,
714 -- then nothing to check (happens in some instantiation cases)
716 if E_Scope = Standard_Standard then
719 -- Otherwise move up a scope looking for compilation unit
722 E_Scope := Scope (E_Scope);
726 -- No checks needed for pure or preelaborated compilation units
728 if Is_Pure (E_Scope) or else Is_Preelaborated (E_Scope) then
732 -- If the generic entity is within a deeper instance than we are, then
733 -- either the instantiation to which we refer itself caused an ABE, in
734 -- which case that will be handled separately, or else we know that the
735 -- body we need appears as needed at the point of the instantiation.
736 -- However, this assumption is only valid if we are in static mode.
738 if not Dynamic_Elaboration_Checks
740 Instantiation_Depth (Sloc (Ent)) > Instantiation_Depth (Sloc (N))
745 -- Do not give a warning for a package with no body
747 if Ekind (Ent) = E_Generic_Package and then not Has_Generic_Body (N) then
751 -- Find top level scope for called entity (not following renamings
752 -- or derivations). This is where the Elaborate_All will go if it is
753 -- needed. We start with the called entity, except in the case of an
754 -- initialization procedure outside the current package, where the init
755 -- proc is in the root package, and we start from the entity of the name
759 Ent : constant Entity_Id := Get_Referenced_Ent (N);
761 if Is_Init_Proc (Ent) and then not In_Same_Extended_Unit (N, Ent) then
762 W_Scope := Scope (Ent);
768 -- Now loop through scopes to get to the enclosing compilation unit
770 while not Is_Compilation_Unit (W_Scope) loop
771 W_Scope := Scope (W_Scope);
774 -- Case of entity is in same unit as call or instantiation. In the
775 -- instantiation case, W_Scope may be different from E_Scope; we want
776 -- the unit in which the instantiation occurs, since we're analyzing
777 -- based on the expansion.
779 if W_Scope = C_Scope then
780 if not Inter_Unit_Only then
781 Check_Internal_Call (N, Ent, Outer_Scope, E);
787 -- Case of entity is not in current unit (i.e. with'ed unit case)
789 -- We are only interested in such calls if the outer call was from
790 -- elaboration code, or if we are in Dynamic_Elaboration_Checks mode.
792 if not From_Elab_Code and then not Dynamic_Elaboration_Checks then
796 -- Nothing to do if some scope said that no checks were required
802 -- Nothing to do for a generic instance, because in this case the
803 -- checking was at the point of instantiation of the generic However,
804 -- this shortcut is only applicable in static mode.
806 if Is_Generic_Instance (Ent) and not Dynamic_Elaboration_Checks then
810 -- Nothing to do if subprogram with no separate spec. However, a call
811 -- to Deep_Initialize may result in a call to a user-defined Initialize
812 -- procedure, which imposes a body dependency. This happens only if the
813 -- type is controlled and the Initialize procedure is not inherited.
815 if Body_Acts_As_Spec then
816 if Is_TSS (Ent, TSS_Deep_Initialize) then
818 Typ : constant Entity_Id := Etype (First_Formal (Ent));
822 if not Is_Controlled (Typ) then
825 Init := Find_Prim_Op (Typ, Name_Initialize);
827 if Comes_From_Source (Init) then
840 -- Check cases of internal units
842 Callee_Unit_Internal :=
843 Is_Internal_File_Name (Unit_File_Name (Get_Source_Unit (E_Scope)));
845 -- Do not give a warning if the with'ed unit is internal and this is
846 -- the generic instantiation case (this saves a lot of hassle dealing
847 -- with the Text_IO special child units)
849 if Callee_Unit_Internal and Inst_Case then
853 if C_Scope = Standard_Standard then
854 Caller_Unit_Internal := False;
856 Caller_Unit_Internal :=
857 Is_Internal_File_Name (Unit_File_Name (Get_Source_Unit (C_Scope)));
860 -- Do not give a warning if the with'ed unit is internal and the
861 -- caller is not internal (since the binder always elaborates
862 -- internal units first).
864 if Callee_Unit_Internal and (not Caller_Unit_Internal) then
868 -- For now, if debug flag -gnatdE is not set, do no checking for
869 -- one internal unit withing another. This fixes the problem with
870 -- the sgi build and storage errors. To be resolved later ???
872 if (Callee_Unit_Internal and Caller_Unit_Internal)
873 and not Debug_Flag_EE
878 if Is_TSS (E, TSS_Deep_Initialize) then
882 -- If the call is in an instance, and the called entity is not
883 -- defined in the same instance, then the elaboration issue focuses
884 -- around the unit containing the template, it is this unit which
885 -- requires an Elaborate_All.
887 -- However, if we are doing dynamic elaboration, we need to chase the
888 -- call in the usual manner.
890 -- We also need to chase the call in the usual manner if it is a call
891 -- to a generic formal parameter, since that case was not handled as
892 -- part of the processing of the template.
894 Inst_Caller := Instantiation (Get_Source_File_Index (Sloc (N)));
895 Inst_Callee := Instantiation (Get_Source_File_Index (Sloc (Ent)));
897 if Inst_Caller = No_Location then
898 Unit_Caller := No_Unit;
900 Unit_Caller := Get_Source_Unit (N);
903 if Inst_Callee = No_Location then
904 Unit_Callee := No_Unit;
906 Unit_Callee := Get_Source_Unit (Ent);
909 if Unit_Caller /= No_Unit
910 and then Unit_Callee /= Unit_Caller
911 and then not Dynamic_Elaboration_Checks
912 and then not Is_Call_Of_Generic_Formal (N)
914 E_Scope := Spec_Entity (Cunit_Entity (Unit_Caller));
916 -- If we don't get a spec entity, just ignore call. Not quite
917 -- clear why this check is necessary. ???
923 -- Otherwise step to enclosing compilation unit
925 while not Is_Compilation_Unit (E_Scope) loop
926 E_Scope := Scope (E_Scope);
929 -- For the case where N is not an instance, and is not a call within
930 -- instance to other than a generic formal, we recompute E_Scope
931 -- for the error message, since we do NOT want to go to the unit
932 -- which has the ultimate declaration in the case of renaming and
933 -- derivation and we also want to go to the generic unit in the
934 -- case of an instance, and no further.
937 -- Loop to carefully follow renamings and derivations one step
938 -- outside the current unit, but not further.
940 if not (Inst_Case or Variable_Case)
941 and then Present (Alias (Ent))
943 E_Scope := Alias (Ent);
949 while not Is_Compilation_Unit (E_Scope) loop
950 E_Scope := Scope (E_Scope);
953 -- If E_Scope is the same as C_Scope, it means that there
954 -- definitely was a local renaming or derivation, and we
955 -- are not yet out of the current unit.
957 exit when E_Scope /= C_Scope;
961 -- If no alias, there is a previous error
964 Check_Error_Detected;
970 if Within_Elaborate_All (Current_Sem_Unit, E_Scope) then
974 Is_DIC_Proc := Is_Nontrivial_Default_Init_Cond_Procedure (Ent);
976 -- Elaboration issues in SPARK are reported only for source constructs
977 -- and for nontrivial Default_Initial_Condition procedures. The latter
978 -- must be checked because the default initialization of an object of a
979 -- private type triggers the evaluation of the Default_Initial_Condition
980 -- expression, which in turn may have side effects.
983 SPARK_Mode = On and (Comes_From_Source (Ent) or Is_DIC_Proc);
985 -- Now check if an Elaborate_All (or dynamic check) is needed
987 if not Suppress_Elaboration_Warnings (Ent)
988 and then not Elaboration_Checks_Suppressed (Ent)
989 and then not Suppress_Elaboration_Warnings (E_Scope)
990 and then not Elaboration_Checks_Suppressed (E_Scope)
991 and then ((Elab_Warnings or Elab_Info_Messages)
992 or else SPARK_Mode = On)
993 and then Generate_Warnings
995 -- Instantiation case
998 if Issue_In_SPARK then
1000 ("instantiation of & during elaboration in SPARK", N, Ent);
1003 ("instantiation of & may raise Program_Error?l?",
1004 "info: instantiation of & during elaboration?$?", Ent);
1007 -- Indirect call case, info message only in static elaboration
1008 -- case, because the attribute reference itself cannot raise an
1009 -- exception. Note that SPARK does not permit indirect calls.
1011 elsif Access_Case then
1012 Elab_Warning ("", "info: access to & during elaboration?$?", Ent);
1014 -- Variable reference in SPARK mode
1016 elsif Variable_Case and Issue_In_SPARK then
1018 ("reference to & during elaboration in SPARK", N, Ent);
1020 -- Subprogram call case
1023 if Nkind (Name (N)) in N_Has_Entity
1024 and then Is_Init_Proc (Entity (Name (N)))
1025 and then Comes_From_Source (Ent)
1028 ("implicit call to & may raise Program_Error?l?",
1029 "info: implicit call to & during elaboration?$?",
1032 elsif Issue_In_SPARK then
1034 -- Emit a specialized error message when the elaboration of an
1035 -- object of a private type evaluates the expression of pragma
1036 -- Default_Initial_Condition. This prevents the internal name
1037 -- of the procedure from appearing in the error message.
1041 ("call to Default_Initial_Condition during elaboration in "
1045 ("call to & during elaboration in SPARK", N, Ent);
1050 ("call to & may raise Program_Error?l?",
1051 "info: call to & during elaboration?$?",
1056 Error_Msg_Qual_Level := Nat'Last;
1058 -- Case of Elaborate_All not present and required, for SPARK this
1059 -- is an error, so give an error message.
1061 if Issue_In_SPARK then
1062 Error_Msg_NE ("\Elaborate_All pragma required for&", N, W_Scope);
1064 -- Otherwise we generate an implicit pragma. For a subprogram
1065 -- instantiation, Elaborate is good enough, since no transitive
1066 -- call is possible at elaboration time in this case.
1068 elsif Nkind (N) in N_Subprogram_Instantiation then
1070 ("\missing pragma Elaborate for&?l?",
1071 "\implicit pragma Elaborate for& generated?$?",
1074 -- For all other cases, we need an implicit Elaborate_All
1078 ("\missing pragma Elaborate_All for&?l?",
1079 "\implicit pragma Elaborate_All for & generated?$?",
1083 Error_Msg_Qual_Level := 0;
1085 -- Take into account the flags related to elaboration warning
1086 -- messages when enumerating the various calls involved. This
1087 -- ensures the proper pairing of the main warning and the
1088 -- clarification messages generated by Output_Calls.
1090 Output_Calls (N, Check_Elab_Flag => True);
1092 -- Set flag to prevent further warnings for same unit unless in
1095 if not All_Errors_Mode and not Dynamic_Elaboration_Checks then
1096 Set_Suppress_Elaboration_Warnings (W_Scope, True);
1100 -- Check for runtime elaboration check required
1102 if Dynamic_Elaboration_Checks then
1103 if not Elaboration_Checks_Suppressed (Ent)
1104 and then not Elaboration_Checks_Suppressed (W_Scope)
1105 and then not Elaboration_Checks_Suppressed (E_Scope)
1106 and then not Cunit_SC
1108 -- Runtime elaboration check required. Generate check of the
1109 -- elaboration Boolean for the unit containing the entity.
1111 -- Note that for this case, we do check the real unit (the one
1112 -- from following renamings, since that is the issue).
1114 -- Could this possibly miss a useless but required PE???
1116 Insert_Elab_Check (N,
1117 Make_Attribute_Reference (Loc,
1118 Attribute_Name => Name_Elaborated,
1120 New_Occurrence_Of (Spec_Entity (E_Scope), Loc)));
1122 -- Prevent duplicate elaboration checks on the same call,
1123 -- which can happen if the body enclosing the call appears
1124 -- itself in a call whose elaboration check is delayed.
1126 if Nkind (N) in N_Subprogram_Call then
1127 Set_No_Elaboration_Check (N);
1131 -- Case of static elaboration model
1134 -- Do not do anything if elaboration checks suppressed. Note that
1135 -- we check Ent here, not E, since we want the real entity for the
1136 -- body to see if checks are suppressed for it, not the dummy
1137 -- entry for renamings or derivations.
1139 if Elaboration_Checks_Suppressed (Ent)
1140 or else Elaboration_Checks_Suppressed (E_Scope)
1141 or else Elaboration_Checks_Suppressed (W_Scope)
1145 -- Do not generate an Elaborate_All for finalization routines
1146 -- which perform partial clean up as part of initialization.
1148 elsif In_Init_Proc and then Is_Finalization_Procedure (Ent) then
1151 -- Here we need to generate an implicit elaborate all
1154 -- Generate Elaborate_All warning unless suppressed
1156 if (Elab_Info_Messages and Generate_Warnings and not Inst_Case)
1157 and then not Suppress_Elaboration_Warnings (Ent)
1158 and then not Suppress_Elaboration_Warnings (E_Scope)
1159 and then not Suppress_Elaboration_Warnings (W_Scope)
1161 Error_Msg_Node_2 := W_Scope;
1163 ("info: call to& in elaboration code " &
1164 "requires pragma Elaborate_All on&?$?", N, E);
1167 -- Set indication for binder to generate Elaborate_All
1169 Set_Elaboration_Constraint (N, E, W_Scope);
1174 -----------------------------
1175 -- Check_Bad_Instantiation --
1176 -----------------------------
1178 procedure Check_Bad_Instantiation (N : Node_Id) is
1182 -- Nothing to do if we do not have an instantiation (happens in some
1183 -- error cases, and also in the formal package declaration case)
1185 if Nkind (N) not in N_Generic_Instantiation then
1188 -- Nothing to do if serious errors detected (avoid cascaded errors)
1190 elsif Serious_Errors_Detected /= 0 then
1193 -- Nothing to do if not in full analysis mode
1195 elsif not Full_Analysis then
1198 -- Nothing to do if inside a generic template
1200 elsif Inside_A_Generic then
1203 -- Nothing to do if a library level instantiation
1205 elsif Nkind (Parent (N)) = N_Compilation_Unit then
1208 -- Nothing to do if we are compiling a proper body for semantic
1209 -- purposes only. The generic body may be in another proper body.
1212 Nkind (Parent (Unit_Declaration_Node (Main_Unit_Entity))) = N_Subunit
1217 Ent := Get_Generic_Entity (N);
1219 -- The case we are interested in is when the generic spec is in the
1220 -- current declarative part
1222 if not Same_Elaboration_Scope (Current_Scope, Scope (Ent))
1223 or else not In_Same_Extended_Unit (N, Ent)
1228 -- If the generic entity is within a deeper instance than we are, then
1229 -- either the instantiation to which we refer itself caused an ABE, in
1230 -- which case that will be handled separately. Otherwise, we know that
1231 -- the body we need appears as needed at the point of the instantiation.
1232 -- If they are both at the same level but not within the same instance
1233 -- then the body of the generic will be in the earlier instance.
1236 D1 : constant Int := Instantiation_Depth (Sloc (Ent));
1237 D2 : constant Int := Instantiation_Depth (Sloc (N));
1244 and then Is_Generic_Instance (Scope (Ent))
1245 and then not In_Open_Scopes (Scope (Ent))
1251 -- Now we can proceed, if the entity being called has a completion,
1252 -- then we are definitely OK, since we have already seen the body.
1254 if Has_Completion (Ent) then
1258 -- If there is no body, then nothing to do
1260 if not Has_Generic_Body (N) then
1264 -- Here we definitely have a bad instantiation
1266 Error_Msg_Warn := SPARK_Mode /= On;
1267 Error_Msg_NE ("cannot instantiate& before body seen<<", N, Ent);
1269 if Present (Instance_Spec (N)) then
1270 Supply_Bodies (Instance_Spec (N));
1273 Error_Msg_N ("\Program_Error [<<", N);
1274 Insert_Elab_Check (N);
1275 Set_ABE_Is_Certain (N);
1276 end Check_Bad_Instantiation;
1278 ---------------------
1279 -- Check_Elab_Call --
1280 ---------------------
1282 procedure Check_Elab_Call
1284 Outer_Scope : Entity_Id := Empty;
1285 In_Init_Proc : Boolean := False)
1291 -- If the reference is not in the main unit, there is nothing to check.
1292 -- Elaboration call from units in the context of the main unit will lead
1293 -- to semantic dependencies when those units are compiled.
1295 if not In_Extended_Main_Code_Unit (N) then
1299 -- For an entry call, check relevant restriction
1301 if Nkind (N) = N_Entry_Call_Statement
1302 and then not In_Subprogram_Or_Concurrent_Unit
1304 Check_Restriction (No_Entry_Calls_In_Elaboration_Code, N);
1306 -- Nothing to do if this is not an expected type of reference (happens
1307 -- in some error conditions, and in some cases where rewriting occurs).
1309 elsif Nkind (N) not in N_Subprogram_Call
1310 and then Nkind (N) /= N_Attribute_Reference
1311 and then (SPARK_Mode /= On
1312 or else Nkind (N) not in N_Has_Entity
1313 or else No (Entity (N))
1314 or else Ekind (Entity (N)) /= E_Variable)
1318 -- Nothing to do if this is a call already rewritten for elab checking.
1319 -- Such calls appear as the targets of If_Expressions.
1321 -- This check MUST be wrong, it catches far too much
1323 elsif Nkind (Parent (N)) = N_If_Expression then
1326 -- Nothing to do if inside a generic template
1328 elsif Inside_A_Generic
1329 and then No (Enclosing_Generic_Body (N))
1333 -- Nothing to do if call is being pre-analyzed, as when within a
1334 -- pre/postcondition, a predicate, or an invariant.
1336 elsif In_Spec_Expression then
1340 -- Nothing to do if this is a call to a postcondition, which is always
1341 -- within a subprogram body, even though the current scope may be the
1342 -- enclosing scope of the subprogram.
1344 if Nkind (N) = N_Procedure_Call_Statement
1345 and then Is_Entity_Name (Name (N))
1346 and then Chars (Entity (Name (N))) = Name_uPostconditions
1351 -- Here we have a reference at elaboration time which must be checked
1353 if Debug_Flag_LL then
1354 Write_Str (" Check_Elab_Ref: ");
1356 if Nkind (N) = N_Attribute_Reference then
1357 if not Is_Entity_Name (Prefix (N)) then
1358 Write_Str ("<<not entity name>>");
1360 Write_Name (Chars (Entity (Prefix (N))));
1363 Write_Str ("'Access");
1365 elsif No (Name (N)) or else not Is_Entity_Name (Name (N)) then
1366 Write_Str ("<<not entity name>> ");
1369 Write_Name (Chars (Entity (Name (N))));
1372 Write_Str (" reference at ");
1373 Write_Location (Sloc (N));
1377 -- Climb up the tree to make sure we are not inside default expression
1378 -- of a parameter specification or a record component, since in both
1379 -- these cases, we will be doing the actual reference later, not now,
1380 -- and it is at the time of the actual reference (statically speaking)
1381 -- that we must do our static check, not at the time of its initial
1384 -- However, we have to check references within component definitions
1385 -- (e.g. a function call that determines an array component bound),
1386 -- so we terminate the loop in that case.
1389 while Present (P) loop
1390 if Nkind_In (P, N_Parameter_Specification,
1391 N_Component_Declaration)
1395 -- The reference occurs within the constraint of a component,
1396 -- so it must be checked.
1398 elsif Nkind (P) = N_Component_Definition then
1406 -- Stuff that happens only at the outer level
1408 if No (Outer_Scope) then
1409 Elab_Visited.Set_Last (0);
1411 -- Nothing to do if current scope is Standard (this is a bit odd, but
1412 -- it happens in the case of generic instantiations).
1414 C_Scope := Current_Scope;
1416 if C_Scope = Standard_Standard then
1420 -- First case, we are in elaboration code
1422 From_Elab_Code := not In_Subprogram_Or_Concurrent_Unit;
1424 if From_Elab_Code then
1426 -- Complain if ref that comes from source in preelaborated unit
1427 -- and we are not inside a subprogram (i.e. we are in elab code).
1429 if Comes_From_Source (N)
1430 and then In_Preelaborated_Unit
1431 and then not In_Inlined_Body
1432 and then Nkind (N) /= N_Attribute_Reference
1434 -- This is a warning in GNAT mode allowing such calls to be
1435 -- used in the predefined library with appropriate care.
1437 Error_Msg_Warn := GNAT_Mode;
1439 ("<<non-static call not allowed in preelaborated unit", N);
1443 -- Second case, we are inside a subprogram or concurrent unit, which
1444 -- means we are not in elaboration code.
1447 -- In this case, the issue is whether we are inside the
1448 -- declarative part of the unit in which we live, or inside its
1449 -- statements. In the latter case, there is no issue of ABE calls
1450 -- at this level (a call from outside to the unit in which we live
1451 -- might cause an ABE, but that will be detected when we analyze
1452 -- that outer level call, as it recurses into the called unit).
1454 -- Climb up the tree, doing this test, and also testing for being
1455 -- inside a default expression, which, as discussed above, is not
1456 -- checked at this stage.
1465 -- If we find a parentless subtree, it seems safe to assume
1466 -- that we are not in a declarative part and that no
1467 -- checking is required.
1473 if Is_List_Member (P) then
1474 L := List_Containing (P);
1481 exit when Nkind (P) = N_Subunit;
1483 -- Filter out case of default expressions, where we do not
1484 -- do the check at this stage.
1486 if Nkind_In (P, N_Parameter_Specification,
1487 N_Component_Declaration)
1492 -- A protected body has no elaboration code and contains
1493 -- only other bodies.
1495 if Nkind (P) = N_Protected_Body then
1498 elsif Nkind_In (P, N_Subprogram_Body,
1503 if L = Declarations (P) then
1506 -- We are not in elaboration code, but we are doing
1507 -- dynamic elaboration checks, in this case, we still
1508 -- need to do the reference, since the subprogram we are
1509 -- in could be called from another unit, also in dynamic
1510 -- elaboration check mode, at elaboration time.
1512 elsif Dynamic_Elaboration_Checks then
1514 -- We provide a debug flag to disable this check. That
1515 -- way we have an easy work around for regressions
1516 -- that are caused by this new check. This debug flag
1517 -- can be removed later.
1519 if Debug_Flag_DD then
1523 -- Do the check in this case
1527 elsif Nkind (P) = N_Task_Body then
1529 -- The check is deferred until Check_Task_Activation
1530 -- but we need to capture local suppress pragmas
1531 -- that may inhibit checks on this call.
1533 Ent := Get_Referenced_Ent (N);
1538 elsif Elaboration_Checks_Suppressed (Current_Scope)
1539 or else Elaboration_Checks_Suppressed (Ent)
1540 or else Elaboration_Checks_Suppressed (Scope (Ent))
1542 if Nkind (N) in N_Subprogram_Call then
1543 Set_No_Elaboration_Check (N);
1549 -- Static model, call is not in elaboration code, we
1550 -- never need to worry, because in the static model the
1551 -- top level caller always takes care of things.
1562 Ent := Get_Referenced_Ent (N);
1568 -- Nothing to do if this is a recursive call (i.e. a call to
1569 -- an entity that is already in the Elab_Call stack)
1571 for J in 1 .. Elab_Visited.Last loop
1572 if Ent = Elab_Visited.Table (J) then
1577 -- See if we need to analyze this reference. We analyze it if either of
1578 -- the following conditions is met:
1580 -- It is an inner level call (since in this case it was triggered
1581 -- by an outer level call from elaboration code), but only if the
1582 -- call is within the scope of the original outer level call.
1584 -- It is an outer level reference from elaboration code, or a call to
1585 -- an entity is in the same elaboration scope.
1587 -- And in these cases, we will check both inter-unit calls and
1588 -- intra-unit (within a single unit) calls.
1590 C_Scope := Current_Scope;
1592 -- If not outer level reference, then we follow it if it is within the
1593 -- original scope of the outer reference.
1595 if Present (Outer_Scope)
1596 and then Within (Scope (Ent), Outer_Scope)
1602 Outer_Scope => Outer_Scope,
1603 Inter_Unit_Only => False,
1604 In_Init_Proc => In_Init_Proc);
1606 -- Nothing to do if elaboration checks suppressed for this scope.
1607 -- However, an interesting exception, the fact that elaboration checks
1608 -- are suppressed within an instance (because we can trace the body when
1609 -- we process the template) does not extend to calls to generic formal
1612 elsif Elaboration_Checks_Suppressed (Current_Scope)
1613 and then not Is_Call_Of_Generic_Formal (N)
1617 elsif From_Elab_Code then
1619 Check_A_Call (N, Ent, Standard_Standard, Inter_Unit_Only => False);
1621 elsif Same_Elaboration_Scope (C_Scope, Scope (Ent)) then
1623 Check_A_Call (N, Ent, Scope (Ent), Inter_Unit_Only => False);
1625 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode
1626 -- is set, then we will do the check, but only in the inter-unit case
1627 -- (this is to accommodate unguarded elaboration calls from other units
1628 -- in which this same mode is set). We don't want warnings in this case,
1629 -- it would generate warnings having nothing to do with elaboration.
1631 elsif Dynamic_Elaboration_Checks then
1637 Inter_Unit_Only => True,
1638 Generate_Warnings => False);
1640 -- Otherwise nothing to do
1646 -- A call to an Init_Proc in elaboration code may bring additional
1647 -- dependencies, if some of the record components thereof have
1648 -- initializations that are function calls that come from source. We
1649 -- treat the current node as a call to each of these functions, to check
1650 -- their elaboration impact.
1652 if Is_Init_Proc (Ent) and then From_Elab_Code then
1653 Process_Init_Proc : declare
1654 Unit_Decl : constant Node_Id := Unit_Declaration_Node (Ent);
1656 function Check_Init_Call (Nod : Node_Id) return Traverse_Result;
1657 -- Find subprogram calls within body of Init_Proc for Traverse
1658 -- instantiation below.
1660 procedure Traverse_Body is new Traverse_Proc (Check_Init_Call);
1661 -- Traversal procedure to find all calls with body of Init_Proc
1663 ---------------------
1664 -- Check_Init_Call --
1665 ---------------------
1667 function Check_Init_Call (Nod : Node_Id) return Traverse_Result is
1671 if Nkind (Nod) in N_Subprogram_Call
1672 and then Is_Entity_Name (Name (Nod))
1674 Func := Entity (Name (Nod));
1676 if Comes_From_Source (Func) then
1678 (N, Func, Standard_Standard, Inter_Unit_Only => True);
1686 end Check_Init_Call;
1688 -- Start of processing for Process_Init_Proc
1691 if Nkind (Unit_Decl) = N_Subprogram_Body then
1692 Traverse_Body (Handled_Statement_Sequence (Unit_Decl));
1694 end Process_Init_Proc;
1696 end Check_Elab_Call;
1698 -----------------------
1699 -- Check_Elab_Assign --
1700 -----------------------
1702 procedure Check_Elab_Assign (N : Node_Id) is
1706 Pkg_Spec : Entity_Id;
1707 Pkg_Body : Entity_Id;
1710 -- For record or array component, check prefix. If it is an access type,
1711 -- then there is nothing to do (we do not know what is being assigned),
1712 -- but otherwise this is an assignment to the prefix.
1714 if Nkind_In (N, N_Indexed_Component,
1715 N_Selected_Component,
1718 if not Is_Access_Type (Etype (Prefix (N))) then
1719 Check_Elab_Assign (Prefix (N));
1725 -- For type conversion, check expression
1727 if Nkind (N) = N_Type_Conversion then
1728 Check_Elab_Assign (Expression (N));
1732 -- Nothing to do if this is not an entity reference otherwise get entity
1734 if Is_Entity_Name (N) then
1740 -- What we are looking for is a reference in the body of a package that
1741 -- modifies a variable declared in the visible part of the package spec.
1744 and then Comes_From_Source (N)
1745 and then not Suppress_Elaboration_Warnings (Ent)
1746 and then Ekind (Ent) = E_Variable
1747 and then not In_Private_Part (Ent)
1748 and then Is_Library_Level_Entity (Ent)
1750 Scop := Current_Scope;
1752 if No (Scop) or else Scop = Standard_Standard then
1754 elsif Ekind (Scop) = E_Package
1755 and then Is_Compilation_Unit (Scop)
1759 Scop := Scope (Scop);
1763 -- Here Scop points to the containing library package
1766 Pkg_Body := Body_Entity (Pkg_Spec);
1768 -- All OK if the package has an Elaborate_Body pragma
1770 if Has_Pragma_Elaborate_Body (Scop) then
1774 -- OK if entity being modified is not in containing package spec
1776 if not In_Same_Source_Unit (Scop, Ent) then
1780 -- All OK if entity appears in generic package or generic instance.
1781 -- We just get too messed up trying to give proper warnings in the
1782 -- presence of generics. Better no message than a junk one.
1784 Scop := Scope (Ent);
1785 while Present (Scop) and then Scop /= Pkg_Spec loop
1786 if Ekind (Scop) = E_Generic_Package then
1788 elsif Ekind (Scop) = E_Package
1789 and then Is_Generic_Instance (Scop)
1794 Scop := Scope (Scop);
1797 -- All OK if in task, don't issue warnings there
1799 if In_Task_Activation then
1803 -- OK if no package body
1805 if No (Pkg_Body) then
1809 -- OK if reference is not in package body
1811 if not In_Same_Source_Unit (Pkg_Body, N) then
1815 -- OK if package body has no handled statement sequence
1818 HSS : constant Node_Id :=
1819 Handled_Statement_Sequence (Declaration_Node (Pkg_Body));
1821 if No (HSS) or else not Comes_From_Source (HSS) then
1826 -- We definitely have a case of a modification of an entity in
1827 -- the package spec from the elaboration code of the package body.
1828 -- We may not give the warning (because there are some additional
1829 -- checks to avoid too many false positives), but it would be a good
1830 -- idea for the binder to try to keep the body elaboration close to
1831 -- the spec elaboration.
1833 Set_Elaborate_Body_Desirable (Pkg_Spec);
1835 -- All OK in gnat mode (we know what we are doing)
1841 -- All OK if all warnings suppressed
1843 if Warning_Mode = Suppress then
1847 -- All OK if elaboration checks suppressed for entity
1849 if Checks_May_Be_Suppressed (Ent)
1850 and then Is_Check_Suppressed (Ent, Elaboration_Check)
1855 -- OK if the entity is initialized. Note that the No_Initialization
1856 -- flag usually means that the initialization has been rewritten into
1857 -- assignments, but that still counts for us.
1860 Decl : constant Node_Id := Declaration_Node (Ent);
1862 if Nkind (Decl) = N_Object_Declaration
1863 and then (Present (Expression (Decl))
1864 or else No_Initialization (Decl))
1870 -- Here is where we give the warning
1872 -- All OK if warnings suppressed on the entity
1874 if not Has_Warnings_Off (Ent) then
1875 Error_Msg_Sloc := Sloc (Ent);
1878 ("??& can be accessed by clients before this initialization",
1881 ("\??add Elaborate_Body to spec to ensure & is initialized",
1885 if not All_Errors_Mode then
1886 Set_Suppress_Elaboration_Warnings (Ent);
1889 end Check_Elab_Assign;
1891 ----------------------
1892 -- Check_Elab_Calls --
1893 ----------------------
1895 procedure Check_Elab_Calls is
1897 -- If expansion is disabled, do not generate any checks. Also skip
1898 -- checks if any subunits are missing because in either case we lack the
1899 -- full information that we need, and no object file will be created in
1902 if not Expander_Active
1903 or else Is_Generic_Unit (Cunit_Entity (Main_Unit))
1904 or else Subunits_Missing
1909 -- Skip delayed calls if we had any errors
1911 if Serious_Errors_Detected = 0 then
1912 Delaying_Elab_Checks := False;
1913 Expander_Mode_Save_And_Set (True);
1915 for J in Delay_Check.First .. Delay_Check.Last loop
1916 Push_Scope (Delay_Check.Table (J).Curscop);
1917 From_Elab_Code := Delay_Check.Table (J).From_Elab_Code;
1919 Check_Internal_Call_Continue (
1920 N => Delay_Check.Table (J).N,
1921 E => Delay_Check.Table (J).E,
1922 Outer_Scope => Delay_Check.Table (J).Outer_Scope,
1923 Orig_Ent => Delay_Check.Table (J).Orig_Ent);
1928 -- Set Delaying_Elab_Checks back on for next main compilation
1930 Expander_Mode_Restore;
1931 Delaying_Elab_Checks := True;
1933 end Check_Elab_Calls;
1935 ------------------------------
1936 -- Check_Elab_Instantiation --
1937 ------------------------------
1939 procedure Check_Elab_Instantiation
1941 Outer_Scope : Entity_Id := Empty)
1946 -- Check for and deal with bad instantiation case. There is some
1947 -- duplicated code here, but we will worry about this later ???
1949 Check_Bad_Instantiation (N);
1951 if ABE_Is_Certain (N) then
1955 -- Nothing to do if we do not have an instantiation (happens in some
1956 -- error cases, and also in the formal package declaration case)
1958 if Nkind (N) not in N_Generic_Instantiation then
1962 -- Nothing to do if inside a generic template
1964 if Inside_A_Generic then
1968 -- Nothing to do if the instantiation is not in the main unit
1970 if not In_Extended_Main_Code_Unit (N) then
1974 Ent := Get_Generic_Entity (N);
1975 From_Elab_Code := not In_Subprogram_Or_Concurrent_Unit;
1977 -- See if we need to analyze this instantiation. We analyze it if
1978 -- either of the following conditions is met:
1980 -- It is an inner level instantiation (since in this case it was
1981 -- triggered by an outer level call from elaboration code), but
1982 -- only if the instantiation is within the scope of the original
1983 -- outer level call.
1985 -- It is an outer level instantiation from elaboration code, or the
1986 -- instantiated entity is in the same elaboration scope.
1988 -- And in these cases, we will check both the inter-unit case and
1989 -- the intra-unit (within a single unit) case.
1991 C_Scope := Current_Scope;
1993 if Present (Outer_Scope) and then Within (Scope (Ent), Outer_Scope) then
1995 Check_A_Call (N, Ent, Outer_Scope, Inter_Unit_Only => False);
1997 elsif From_Elab_Code then
1999 Check_A_Call (N, Ent, Standard_Standard, Inter_Unit_Only => False);
2001 elsif Same_Elaboration_Scope (C_Scope, Scope (Ent)) then
2003 Check_A_Call (N, Ent, Scope (Ent), Inter_Unit_Only => False);
2005 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode is
2006 -- set, then we will do the check, but only in the inter-unit case (this
2007 -- is to accommodate unguarded elaboration calls from other units in
2008 -- which this same mode is set). We inhibit warnings in this case, since
2009 -- this instantiation is not occurring in elaboration code.
2011 elsif Dynamic_Elaboration_Checks then
2017 Inter_Unit_Only => True,
2018 Generate_Warnings => False);
2023 end Check_Elab_Instantiation;
2025 -------------------------
2026 -- Check_Internal_Call --
2027 -------------------------
2029 procedure Check_Internal_Call
2032 Outer_Scope : Entity_Id;
2033 Orig_Ent : Entity_Id)
2035 Inst_Case : constant Boolean := Nkind (N) in N_Generic_Instantiation;
2038 -- For P'Access, we want to warn if the -gnatw.f switch is set, and the
2039 -- node comes from source.
2041 if Nkind (N) = N_Attribute_Reference and then
2042 (not Warn_On_Elab_Access or else not Comes_From_Source (N))
2046 -- If not function or procedure call, instantiation, or 'Access, then
2047 -- ignore call (this happens in some error cases and rewriting cases).
2050 (N, N_Function_Call,
2051 N_Procedure_Call_Statement,
2052 N_Attribute_Reference)
2053 and then not Inst_Case
2057 -- Nothing to do if this is a call or instantiation that has already
2058 -- been found to be a sure ABE.
2060 elsif Nkind (N) /= N_Attribute_Reference and then ABE_Is_Certain (N) then
2063 -- Nothing to do if errors already detected (avoid cascaded errors)
2065 elsif Serious_Errors_Detected /= 0 then
2068 -- Nothing to do if not in full analysis mode
2070 elsif not Full_Analysis then
2073 -- Nothing to do if analyzing in special spec-expression mode, since the
2074 -- call is not actually being made at this time.
2076 elsif In_Spec_Expression then
2079 -- Nothing to do for call to intrinsic subprogram
2081 elsif Is_Intrinsic_Subprogram (E) then
2084 -- No need to trace local calls if checking task activation, because
2085 -- other local bodies are elaborated already.
2087 elsif In_Task_Activation then
2090 -- Nothing to do if call is within a generic unit
2092 elsif Inside_A_Generic then
2096 -- Delay this call if we are still delaying calls
2098 if Delaying_Elab_Checks then
2099 Delay_Check.Append (
2102 Orig_Ent => Orig_Ent,
2103 Curscop => Current_Scope,
2104 Outer_Scope => Outer_Scope,
2105 From_Elab_Code => From_Elab_Code));
2108 -- Otherwise, call phase 2 continuation right now
2111 Check_Internal_Call_Continue (N, E, Outer_Scope, Orig_Ent);
2113 end Check_Internal_Call;
2115 ----------------------------------
2116 -- Check_Internal_Call_Continue --
2117 ----------------------------------
2119 procedure Check_Internal_Call_Continue
2122 Outer_Scope : Entity_Id;
2123 Orig_Ent : Entity_Id)
2125 function Find_Elab_Reference (N : Node_Id) return Traverse_Result;
2126 -- Function applied to each node as we traverse the body. Checks for
2127 -- call or entity reference that needs checking, and if so checks it.
2128 -- Always returns OK, so entire tree is traversed, except that as
2129 -- described below subprogram bodies are skipped for now.
2131 procedure Traverse is new Atree.Traverse_Proc (Find_Elab_Reference);
2132 -- Traverse procedure using above Find_Elab_Reference function
2134 -------------------------
2135 -- Find_Elab_Reference --
2136 -------------------------
2138 function Find_Elab_Reference (N : Node_Id) return Traverse_Result is
2142 -- If user has specified that there are no entry calls in elaboration
2143 -- code, do not trace past an accept statement, because the rendez-
2144 -- vous will happen after elaboration.
2146 if Nkind_In (Original_Node (N), N_Accept_Statement,
2148 and then Restriction_Active (No_Entry_Calls_In_Elaboration_Code)
2152 -- If we have a function call, check it
2154 elsif Nkind (N) = N_Function_Call then
2155 Check_Elab_Call (N, Outer_Scope);
2158 -- If we have a procedure call, check the call, and also check
2159 -- arguments that are assignments (OUT or IN OUT mode formals).
2161 elsif Nkind (N) = N_Procedure_Call_Statement then
2162 Check_Elab_Call (N, Outer_Scope, In_Init_Proc => Is_Init_Proc (E));
2164 Actual := First_Actual (N);
2165 while Present (Actual) loop
2166 if Known_To_Be_Assigned (Actual) then
2167 Check_Elab_Assign (Actual);
2170 Next_Actual (Actual);
2175 -- If we have an access attribute for a subprogram, check it.
2176 -- Suppress this behavior under debug flag.
2178 elsif not Debug_Flag_Dot_UU
2179 and then Nkind (N) = N_Attribute_Reference
2180 and then Nam_In (Attribute_Name (N), Name_Access,
2181 Name_Unrestricted_Access)
2182 and then Is_Entity_Name (Prefix (N))
2183 and then Is_Subprogram (Entity (Prefix (N)))
2185 Check_Elab_Call (N, Outer_Scope);
2188 -- In SPARK mode, if we have an entity reference to a variable, then
2189 -- check it. For now we consider any reference.
2191 elsif SPARK_Mode = On
2192 and then Nkind (N) in N_Has_Entity
2193 and then Present (Entity (N))
2194 and then Ekind (Entity (N)) = E_Variable
2196 Check_Elab_Call (N, Outer_Scope);
2199 -- If we have a generic instantiation, check it
2201 elsif Nkind (N) in N_Generic_Instantiation then
2202 Check_Elab_Instantiation (N, Outer_Scope);
2205 -- Skip subprogram bodies that come from source (wait for call to
2206 -- analyze these). The reason for the come from source test is to
2207 -- avoid catching task bodies.
2209 -- For task bodies, we should really avoid these too, waiting for the
2210 -- task activation, but that's too much trouble to catch for now, so
2211 -- we go in unconditionally. This is not so terrible, it means the
2212 -- error backtrace is not quite complete, and we are too eager to
2213 -- scan bodies of tasks that are unused, but this is hardly very
2216 elsif Nkind (N) = N_Subprogram_Body
2217 and then Comes_From_Source (N)
2221 elsif Nkind (N) = N_Assignment_Statement
2222 and then Comes_From_Source (N)
2224 Check_Elab_Assign (Name (N));
2230 end Find_Elab_Reference;
2232 Inst_Case : constant Boolean := Is_Generic_Unit (E);
2233 Loc : constant Source_Ptr := Sloc (N);
2238 -- Start of processing for Check_Internal_Call_Continue
2241 -- Save outer level call if at outer level
2243 if Elab_Call.Last = 0 then
2244 Outer_Level_Sloc := Loc;
2247 Elab_Visited.Append (E);
2249 -- If the call is to a function that renames a literal, no check needed
2251 if Ekind (E) = E_Enumeration_Literal then
2255 Sbody := Unit_Declaration_Node (E);
2257 if not Nkind_In (Sbody, N_Subprogram_Body, N_Package_Body) then
2258 Ebody := Corresponding_Body (Sbody);
2263 Sbody := Unit_Declaration_Node (Ebody);
2267 -- If the body appears after the outer level call or instantiation then
2268 -- we have an error case handled below.
2270 if Earlier_In_Extended_Unit (Outer_Level_Sloc, Sloc (Sbody))
2271 and then not In_Task_Activation
2275 -- If we have the instantiation case we are done, since we now
2276 -- know that the body of the generic appeared earlier.
2278 elsif Inst_Case then
2281 -- Otherwise we have a call, so we trace through the called body to see
2282 -- if it has any problems.
2285 pragma Assert (Nkind (Sbody) = N_Subprogram_Body);
2287 Elab_Call.Append ((Cloc => Loc, Ent => E));
2289 if Debug_Flag_LL then
2290 Write_Str ("Elab_Call.Last = ");
2291 Write_Int (Int (Elab_Call.Last));
2292 Write_Str (" Ent = ");
2293 Write_Name (Chars (E));
2295 Write_Location (Sloc (N));
2299 -- Now traverse declarations and statements of subprogram body. Note
2300 -- that we cannot simply Traverse (Sbody), since traverse does not
2301 -- normally visit subprogram bodies.
2306 Decl := First (Declarations (Sbody));
2307 while Present (Decl) loop
2313 Traverse (Handled_Statement_Sequence (Sbody));
2315 Elab_Call.Decrement_Last;
2319 -- Here is the case of calling a subprogram where the body has not yet
2320 -- been encountered. A warning message is needed, except if this is the
2321 -- case of appearing within an aspect specification that results in
2322 -- a check call, we do not really have such a situation, so no warning
2323 -- is needed (e.g. the case of a precondition, where the call appears
2324 -- textually before the body, but in actual fact is moved to the
2325 -- appropriate subprogram body and so does not need a check).
2334 -- Keep looking at parents if we are still in the subexpression
2336 if Nkind (P) in N_Subexpr then
2339 -- Here P is the parent of the expression, check for special case
2342 O := Original_Node (P);
2344 -- Definitely not the special case if orig node is not a pragma
2346 exit when Nkind (O) /= N_Pragma;
2348 -- Check we have an If statement or a null statement (happens
2349 -- when the If has been expanded to be True).
2351 exit when not Nkind_In (P, N_If_Statement, N_Null_Statement);
2353 -- Our special case will be indicated either by the pragma
2354 -- coming from an aspect ...
2356 if Present (Corresponding_Aspect (O)) then
2359 -- Or, in the case of an initial condition, specifically by a
2360 -- Check pragma specifying an Initial_Condition check.
2362 elsif Pragma_Name (O) = Name_Check
2365 (Expression (First (Pragma_Argument_Associations (O)))) =
2366 Name_Initial_Condition
2370 -- For anything else, we have an error
2379 -- Not that special case, warning and dynamic check is required
2381 -- If we have nothing in the call stack, then this is at the outer
2382 -- level, and the ABE is bound to occur, unless it's a 'Access, or
2385 if Elab_Call.Last = 0 then
2386 Error_Msg_Warn := SPARK_Mode /= On;
2389 Insert_Check : Boolean := True;
2390 -- This flag is set to True if an elaboration check should be
2396 ("cannot instantiate& before body seen<<", N, Orig_Ent);
2398 elsif Nkind (N) = N_Attribute_Reference then
2400 ("Access attribute of & before body seen<<", N, Orig_Ent);
2401 Error_Msg_N ("\possible Program_Error on later references<", N);
2402 Insert_Check := False;
2404 elsif Nkind (Unit_Declaration_Node (Orig_Ent)) /=
2405 N_Subprogram_Renaming_Declaration
2408 ("cannot call& before body seen<<", N, Orig_Ent);
2410 elsif not Is_Generic_Actual_Subprogram (Orig_Ent) then
2411 Insert_Check := False;
2414 if Insert_Check then
2415 Error_Msg_N ("\Program_Error [<<", N);
2416 Insert_Elab_Check (N);
2420 -- Call is not at outer level
2423 -- Deal with dynamic elaboration check
2425 if not Elaboration_Checks_Suppressed (E) then
2426 Set_Elaboration_Entity_Required (E);
2428 -- Case of no elaboration entity allocated yet
2430 if No (Elaboration_Entity (E)) then
2432 -- Create object declaration for elaboration entity, and put it
2433 -- just in front of the spec of the subprogram or generic unit,
2434 -- in the same scope as this unit. The subprogram may be over-
2435 -- loaded, so make the name of elaboration entity unique by
2436 -- means of a numeric suffix.
2439 Loce : constant Source_Ptr := Sloc (E);
2440 Ent : constant Entity_Id :=
2441 Make_Defining_Identifier (Loc,
2442 Chars => New_External_Name (Chars (E), 'E', -1));
2445 Set_Elaboration_Entity (E, Ent);
2446 Push_Scope (Scope (E));
2448 Insert_Action (Declaration_Node (E),
2449 Make_Object_Declaration (Loce,
2450 Defining_Identifier => Ent,
2451 Object_Definition =>
2452 New_Occurrence_Of (Standard_Short_Integer, Loce),
2454 Make_Integer_Literal (Loc, Uint_0)));
2456 -- Set elaboration flag at the point of the body
2458 Set_Elaboration_Flag (Sbody, E);
2460 -- Kill current value indication. This is necessary because
2461 -- the tests of this flag are inserted out of sequence and
2462 -- must not pick up bogus indications of the wrong constant
2463 -- value. Also, this is never a true constant, since one way
2464 -- or another, it gets reset.
2466 Set_Current_Value (Ent, Empty);
2467 Set_Last_Assignment (Ent, Empty);
2468 Set_Is_True_Constant (Ent, False);
2473 -- Generate check of the elaboration counter
2475 Insert_Elab_Check (N,
2476 Make_Attribute_Reference (Loc,
2477 Attribute_Name => Name_Elaborated,
2478 Prefix => New_Occurrence_Of (E, Loc)));
2481 -- Generate the warning
2483 if not Suppress_Elaboration_Warnings (E)
2484 and then not Elaboration_Checks_Suppressed (E)
2486 -- Suppress this warning if we have a function call that occurred
2487 -- within an assertion expression, since we can get false warnings
2488 -- in this case, due to the out of order handling in this case.
2491 (Nkind (Original_Node (N)) /= N_Function_Call
2492 or else not In_Assertion_Expression_Pragma (Original_Node (N)))
2494 Error_Msg_Warn := SPARK_Mode /= On;
2498 ("instantiation of& may occur before body is seen<l<",
2501 -- A rather specific check. For Finalize/Adjust/Initialize,
2502 -- if the type has Warnings_Off set, suppress the warning.
2504 if Nam_In (Chars (E), Name_Adjust,
2507 and then Present (First_Formal (E))
2510 T : constant Entity_Id := Etype (First_Formal (E));
2512 if Is_Controlled (T) then
2514 or else (Ekind (T) = E_Private_Type
2515 and then Warnings_Off (Full_View (T)))
2523 -- Go ahead and give warning if not this special case
2526 ("call to& may occur before body is seen<l<", N, Orig_Ent);
2529 Error_Msg_N ("\Program_Error ]<l<", N);
2531 -- There is no need to query the elaboration warning message flags
2532 -- because the main message is an error, not a warning, therefore
2533 -- all the clarification messages produces by Output_Calls must be
2534 -- emitted unconditionally.
2538 Output_Calls (N, Check_Elab_Flag => False);
2542 -- Set flag to suppress further warnings on same subprogram
2543 -- unless in all errors mode
2545 if not All_Errors_Mode then
2546 Set_Suppress_Elaboration_Warnings (E);
2548 end Check_Internal_Call_Continue;
2550 ---------------------------
2551 -- Check_Task_Activation --
2552 ---------------------------
2554 procedure Check_Task_Activation (N : Node_Id) is
2555 Loc : constant Source_Ptr := Sloc (N);
2556 Inter_Procs : constant Elist_Id := New_Elmt_List;
2557 Intra_Procs : constant Elist_Id := New_Elmt_List;
2560 Task_Scope : Entity_Id;
2561 Cunit_SC : Boolean := False;
2564 Enclosing : Entity_Id;
2566 procedure Add_Task_Proc (Typ : Entity_Id);
2567 -- Add to Task_Procs the task body procedure(s) of task types in Typ.
2568 -- For record types, this procedure recurses over component types.
2570 procedure Collect_Tasks (Decls : List_Id);
2571 -- Collect the types of the tasks that are to be activated in the given
2572 -- list of declarations, in order to perform elaboration checks on the
2573 -- corresponding task procedures which are called implicitly here.
2575 function Outer_Unit (E : Entity_Id) return Entity_Id;
2576 -- find enclosing compilation unit of Entity, ignoring subunits, or
2577 -- else enclosing subprogram. If E is not a package, there is no need
2578 -- for inter-unit elaboration checks.
2584 procedure Add_Task_Proc (Typ : Entity_Id) is
2586 Proc : Entity_Id := Empty;
2589 if Is_Task_Type (Typ) then
2590 Proc := Get_Task_Body_Procedure (Typ);
2592 elsif Is_Array_Type (Typ)
2593 and then Has_Task (Base_Type (Typ))
2595 Add_Task_Proc (Component_Type (Typ));
2597 elsif Is_Record_Type (Typ)
2598 and then Has_Task (Base_Type (Typ))
2600 Comp := First_Component (Typ);
2601 while Present (Comp) loop
2602 Add_Task_Proc (Etype (Comp));
2603 Comp := Next_Component (Comp);
2607 -- If the task type is another unit, we will perform the usual
2608 -- elaboration check on its enclosing unit. If the type is in the
2609 -- same unit, we can trace the task body as for an internal call,
2610 -- but we only need to examine other external calls, because at
2611 -- the point the task is activated, internal subprogram bodies
2612 -- will have been elaborated already. We keep separate lists for
2613 -- each kind of task.
2615 -- Skip this test if errors have occurred, since in this case
2616 -- we can get false indications.
2618 if Serious_Errors_Detected /= 0 then
2622 if Present (Proc) then
2623 if Outer_Unit (Scope (Proc)) = Enclosing then
2625 if No (Corresponding_Body (Unit_Declaration_Node (Proc)))
2627 (not Is_Generic_Instance (Scope (Proc))
2628 or else Scope (Proc) = Scope (Defining_Identifier (Decl)))
2630 Error_Msg_Warn := SPARK_Mode /= On;
2632 ("task will be activated before elaboration of its body<<",
2634 Error_Msg_N ("\Program_Error [<<", Decl);
2637 (Corresponding_Body (Unit_Declaration_Node (Proc)))
2639 Append_Elmt (Proc, Intra_Procs);
2643 -- No need for multiple entries of the same type
2645 Elmt := First_Elmt (Inter_Procs);
2646 while Present (Elmt) loop
2647 if Node (Elmt) = Proc then
2654 Append_Elmt (Proc, Inter_Procs);
2663 procedure Collect_Tasks (Decls : List_Id) is
2665 if Present (Decls) then
2666 Decl := First (Decls);
2667 while Present (Decl) loop
2668 if Nkind (Decl) = N_Object_Declaration
2669 and then Has_Task (Etype (Defining_Identifier (Decl)))
2671 Add_Task_Proc (Etype (Defining_Identifier (Decl)));
2683 function Outer_Unit (E : Entity_Id) return Entity_Id is
2688 while Present (Outer) loop
2689 if Elaboration_Checks_Suppressed (Outer) then
2693 exit when Is_Child_Unit (Outer)
2694 or else Scope (Outer) = Standard_Standard
2695 or else Ekind (Outer) /= E_Package;
2696 Outer := Scope (Outer);
2702 -- Start of processing for Check_Task_Activation
2705 Enclosing := Outer_Unit (Current_Scope);
2707 -- Find all tasks declared in the current unit
2709 if Nkind (N) = N_Package_Body then
2710 P := Unit_Declaration_Node (Corresponding_Spec (N));
2712 Collect_Tasks (Declarations (N));
2713 Collect_Tasks (Visible_Declarations (Specification (P)));
2714 Collect_Tasks (Private_Declarations (Specification (P)));
2716 elsif Nkind (N) = N_Package_Declaration then
2717 Collect_Tasks (Visible_Declarations (Specification (N)));
2718 Collect_Tasks (Private_Declarations (Specification (N)));
2721 Collect_Tasks (Declarations (N));
2724 -- We only perform detailed checks in all tasks that are library level
2725 -- entities. If the master is a subprogram or task, activation will
2726 -- depend on the activation of the master itself.
2728 -- Should dynamic checks be added in the more general case???
2730 if Ekind (Enclosing) /= E_Package then
2734 -- For task types defined in other units, we want the unit containing
2735 -- the task body to be elaborated before the current one.
2737 Elmt := First_Elmt (Inter_Procs);
2738 while Present (Elmt) loop
2740 Task_Scope := Outer_Unit (Scope (Ent));
2742 if not Is_Compilation_Unit (Task_Scope) then
2745 elsif Suppress_Elaboration_Warnings (Task_Scope)
2746 or else Elaboration_Checks_Suppressed (Task_Scope)
2750 elsif Dynamic_Elaboration_Checks then
2751 if not Elaboration_Checks_Suppressed (Ent)
2752 and then not Cunit_SC
2754 not Restriction_Active (No_Entry_Calls_In_Elaboration_Code)
2756 -- Runtime elaboration check required. Generate check of the
2757 -- elaboration counter for the unit containing the entity.
2759 Insert_Elab_Check (N,
2760 Make_Attribute_Reference (Loc,
2761 Attribute_Name => Name_Elaborated,
2763 New_Occurrence_Of (Spec_Entity (Task_Scope), Loc)));
2767 -- Force the binder to elaborate other unit first
2769 if not Suppress_Elaboration_Warnings (Ent)
2770 and then not Elaboration_Checks_Suppressed (Ent)
2771 and then Elab_Info_Messages
2772 and then not Suppress_Elaboration_Warnings (Task_Scope)
2773 and then not Elaboration_Checks_Suppressed (Task_Scope)
2775 Error_Msg_Node_2 := Task_Scope;
2777 ("info: activation of an instance of task type&" &
2778 " requires pragma Elaborate_All on &?$?", N, Ent);
2781 Activate_Elaborate_All_Desirable (N, Task_Scope);
2782 Set_Suppress_Elaboration_Warnings (Task_Scope);
2788 -- For tasks declared in the current unit, trace other calls within
2789 -- the task procedure bodies, which are available.
2791 In_Task_Activation := True;
2793 Elmt := First_Elmt (Intra_Procs);
2794 while Present (Elmt) loop
2796 Check_Internal_Call_Continue (N, Ent, Enclosing, Ent);
2800 In_Task_Activation := False;
2801 end Check_Task_Activation;
2803 -------------------------------
2804 -- Is_Call_Of_Generic_Formal --
2805 -------------------------------
2807 function Is_Call_Of_Generic_Formal (N : Node_Id) return Boolean is
2809 return Nkind_In (N, N_Function_Call, N_Procedure_Call_Statement)
2811 -- Always return False if debug flag -gnatd.G is set
2813 and then not Debug_Flag_Dot_GG
2815 -- For now, we detect this by looking for the strange identifier
2816 -- node, whose Chars reflect the name of the generic formal, but
2817 -- the Chars of the Entity references the generic actual.
2819 and then Nkind (Name (N)) = N_Identifier
2820 and then Chars (Name (N)) /= Chars (Entity (Name (N)));
2821 end Is_Call_Of_Generic_Formal;
2823 --------------------------------
2824 -- Set_Elaboration_Constraint --
2825 --------------------------------
2827 procedure Set_Elaboration_Constraint
2832 Elab_Unit : Entity_Id;
2834 -- Check whether this is a call to an Initialize subprogram for a
2835 -- controlled type. Note that Call can also be a 'Access attribute
2836 -- reference, which now generates an elaboration check.
2838 Init_Call : constant Boolean :=
2839 Nkind (Call) = N_Procedure_Call_Statement
2840 and then Chars (Subp) = Name_Initialize
2841 and then Comes_From_Source (Subp)
2842 and then Present (Parameter_Associations (Call))
2843 and then Is_Controlled (Etype (First_Actual (Call)));
2845 -- If the unit is mentioned in a with_clause of the current unit, it is
2846 -- visible, and we can set the elaboration flag.
2848 if Is_Immediately_Visible (Scop)
2849 or else (Is_Child_Unit (Scop) and then Is_Visible_Lib_Unit (Scop))
2851 Activate_Elaborate_All_Desirable (Call, Scop);
2852 Set_Suppress_Elaboration_Warnings (Scop, True);
2856 -- If this is not an initialization call or a call using object notation
2857 -- we know that the unit of the called entity is in the context, and
2858 -- we can set the flag as well. The unit need not be visible if the call
2859 -- occurs within an instantiation.
2861 if Is_Init_Proc (Subp)
2863 or else Nkind (Original_Node (Call)) = N_Selected_Component
2865 null; -- detailed processing follows.
2868 Activate_Elaborate_All_Desirable (Call, Scop);
2869 Set_Suppress_Elaboration_Warnings (Scop, True);
2873 -- If the unit is not in the context, there must be an intermediate unit
2874 -- that is, on which we need to place to elaboration flag. This happens
2875 -- with init proc calls.
2877 if Is_Init_Proc (Subp) or else Init_Call then
2879 -- The initialization call is on an object whose type is not declared
2880 -- in the same scope as the subprogram. The type of the object must
2881 -- be a subtype of the type of operation. This object is the first
2882 -- actual in the call.
2885 Typ : constant Entity_Id :=
2886 Etype (First (Parameter_Associations (Call)));
2888 Elab_Unit := Scope (Typ);
2889 while (Present (Elab_Unit))
2890 and then not Is_Compilation_Unit (Elab_Unit)
2892 Elab_Unit := Scope (Elab_Unit);
2896 -- If original node uses selected component notation, the prefix is
2897 -- visible and determines the scope that must be elaborated. After
2898 -- rewriting, the prefix is the first actual in the call.
2900 elsif Nkind (Original_Node (Call)) = N_Selected_Component then
2901 Elab_Unit := Scope (Etype (First (Parameter_Associations (Call))));
2903 -- Not one of special cases above
2906 -- Using previously computed scope. If the elaboration check is
2907 -- done after analysis, the scope is not visible any longer, but
2908 -- must still be in the context.
2913 Activate_Elaborate_All_Desirable (Call, Elab_Unit);
2914 Set_Suppress_Elaboration_Warnings (Elab_Unit, True);
2915 end Set_Elaboration_Constraint;
2917 ------------------------
2918 -- Get_Referenced_Ent --
2919 ------------------------
2921 function Get_Referenced_Ent (N : Node_Id) return Entity_Id is
2925 if Nkind (N) in N_Has_Entity
2926 and then Present (Entity (N))
2927 and then Ekind (Entity (N)) = E_Variable
2932 if Nkind (N) = N_Attribute_Reference then
2940 elsif Nkind (Nam) = N_Selected_Component then
2941 return Entity (Selector_Name (Nam));
2942 elsif not Is_Entity_Name (Nam) then
2945 return Entity (Nam);
2947 end Get_Referenced_Ent;
2949 ----------------------
2950 -- Has_Generic_Body --
2951 ----------------------
2953 function Has_Generic_Body (N : Node_Id) return Boolean is
2954 Ent : constant Entity_Id := Get_Generic_Entity (N);
2955 Decl : constant Node_Id := Unit_Declaration_Node (Ent);
2958 function Find_Body_In (E : Entity_Id; N : Node_Id) return Node_Id;
2959 -- Determine if the list of nodes headed by N and linked by Next
2960 -- contains a package body for the package spec entity E, and if so
2961 -- return the package body. If not, then returns Empty.
2963 function Load_Package_Body (Nam : Unit_Name_Type) return Node_Id;
2964 -- This procedure is called load the unit whose name is given by Nam.
2965 -- This unit is being loaded to see whether it contains an optional
2966 -- generic body. The returned value is the loaded unit, which is always
2967 -- a package body (only package bodies can contain other entities in the
2968 -- sense in which Has_Generic_Body is interested). We only attempt to
2969 -- load bodies if we are generating code. If we are in semantics check
2970 -- only mode, then it would be wrong to load bodies that are not
2971 -- required from a semantic point of view, so in this case we return
2972 -- Empty. The result is that the caller may incorrectly decide that a
2973 -- generic spec does not have a body when in fact it does, but the only
2974 -- harm in this is that some warnings on elaboration problems may be
2975 -- lost in semantic checks only mode, which is not big loss. We also
2976 -- return Empty if we go for a body and it is not there.
2978 function Locate_Corresponding_Body (PE : Entity_Id) return Node_Id;
2979 -- PE is the entity for a package spec. This function locates the
2980 -- corresponding package body, returning Empty if none is found. The
2981 -- package body returned is fully parsed but may not yet be analyzed,
2982 -- so only syntactic fields should be referenced.
2988 function Find_Body_In (E : Entity_Id; N : Node_Id) return Node_Id is
2993 while Present (Nod) loop
2995 -- If we found the package body we are looking for, return it
2997 if Nkind (Nod) = N_Package_Body
2998 and then Chars (Defining_Unit_Name (Nod)) = Chars (E)
3002 -- If we found the stub for the body, go after the subunit,
3003 -- loading it if necessary.
3005 elsif Nkind (Nod) = N_Package_Body_Stub
3006 and then Chars (Defining_Identifier (Nod)) = Chars (E)
3008 if Present (Library_Unit (Nod)) then
3009 return Unit (Library_Unit (Nod));
3012 return Load_Package_Body (Get_Unit_Name (Nod));
3015 -- If neither package body nor stub, keep looking on chain
3025 -----------------------
3026 -- Load_Package_Body --
3027 -----------------------
3029 function Load_Package_Body (Nam : Unit_Name_Type) return Node_Id is
3030 U : Unit_Number_Type;
3033 if Operating_Mode /= Generate_Code then
3046 return Unit (Cunit (U));
3049 end Load_Package_Body;
3051 -------------------------------
3052 -- Locate_Corresponding_Body --
3053 -------------------------------
3055 function Locate_Corresponding_Body (PE : Entity_Id) return Node_Id is
3056 Spec : constant Node_Id := Declaration_Node (PE);
3057 Decl : constant Node_Id := Parent (Spec);
3058 Scop : constant Entity_Id := Scope (PE);
3062 if Is_Library_Level_Entity (PE) then
3064 -- If package is a library unit that requires a body, we have no
3065 -- choice but to go after that body because it might contain an
3066 -- optional body for the original generic package.
3068 if Unit_Requires_Body (PE) then
3070 -- Load the body. Note that we are a little careful here to use
3071 -- Spec to get the unit number, rather than PE or Decl, since
3072 -- in the case where the package is itself a library level
3073 -- instantiation, Spec will properly reference the generic
3074 -- template, which is what we really want.
3078 (Get_Body_Name (Unit_Name (Get_Source_Unit (Spec))));
3080 -- But if the package is a library unit that does NOT require
3081 -- a body, then no body is permitted, so we are sure that there
3082 -- is no body for the original generic package.
3088 -- Otherwise look and see if we are embedded in a further package
3090 elsif Is_Package_Or_Generic_Package (Scop) then
3092 -- If so, get the body of the enclosing package, and look in
3093 -- its package body for the package body we are looking for.
3095 PBody := Locate_Corresponding_Body (Scop);
3100 return Find_Body_In (PE, First (Declarations (PBody)));
3103 -- If we are not embedded in a further package, then the body
3104 -- must be in the same declarative part as we are.
3107 return Find_Body_In (PE, Next (Decl));
3109 end Locate_Corresponding_Body;
3111 -- Start of processing for Has_Generic_Body
3114 if Present (Corresponding_Body (Decl)) then
3117 elsif Unit_Requires_Body (Ent) then
3120 -- Compilation units cannot have optional bodies
3122 elsif Is_Compilation_Unit (Ent) then
3125 -- Otherwise look at what scope we are in
3128 Scop := Scope (Ent);
3130 -- Case of entity is in other than a package spec, in this case
3131 -- the body, if present, must be in the same declarative part.
3133 if not Is_Package_Or_Generic_Package (Scop) then
3138 -- Declaration node may get us a spec, so if so, go to
3139 -- the parent declaration.
3141 P := Declaration_Node (Ent);
3142 while not Is_List_Member (P) loop
3146 return Present (Find_Body_In (Ent, Next (P)));
3149 -- If the entity is in a package spec, then we have to locate
3150 -- the corresponding package body, and look there.
3154 PBody : constant Node_Id := Locate_Corresponding_Body (Scop);
3162 (Find_Body_In (Ent, (First (Declarations (PBody)))));
3167 end Has_Generic_Body;
3169 -----------------------
3170 -- Insert_Elab_Check --
3171 -----------------------
3173 procedure Insert_Elab_Check (N : Node_Id; C : Node_Id := Empty) is
3175 Loc : constant Source_Ptr := Sloc (N);
3178 -- The check (N_Raise_Program_Error) node to be inserted
3181 -- If expansion is disabled, do not generate any checks. Also
3182 -- skip checks if any subunits are missing because in either
3183 -- case we lack the full information that we need, and no object
3184 -- file will be created in any case.
3186 if not Expander_Active or else Subunits_Missing then
3190 -- If we have a generic instantiation, where Instance_Spec is set,
3191 -- then this field points to a generic instance spec that has
3192 -- been inserted before the instantiation node itself, so that
3193 -- is where we want to insert a check.
3195 if Nkind (N) in N_Generic_Instantiation
3196 and then Present (Instance_Spec (N))
3198 Nod := Instance_Spec (N);
3203 -- Build check node, possibly with condition
3206 Make_Raise_Program_Error (Loc, Reason => PE_Access_Before_Elaboration);
3209 Set_Condition (Chk, Make_Op_Not (Loc, Right_Opnd => C));
3212 -- If we are inserting at the top level, insert in Aux_Decls
3214 if Nkind (Parent (Nod)) = N_Compilation_Unit then
3216 ADN : constant Node_Id := Aux_Decls_Node (Parent (Nod));
3219 if No (Declarations (ADN)) then
3220 Set_Declarations (ADN, New_List (Chk));
3222 Append_To (Declarations (ADN), Chk);
3228 -- Otherwise just insert as an action on the node in question
3231 Insert_Action (Nod, Chk);
3233 end Insert_Elab_Check;
3235 -------------------------------
3236 -- Is_Finalization_Procedure --
3237 -------------------------------
3239 function Is_Finalization_Procedure (Id : Entity_Id) return Boolean is
3241 -- Check whether Id is a procedure with at least one parameter
3243 if Ekind (Id) = E_Procedure and then Present (First_Formal (Id)) then
3245 Typ : constant Entity_Id := Etype (First_Formal (Id));
3246 Deep_Fin : Entity_Id := Empty;
3247 Fin : Entity_Id := Empty;
3250 -- If the type of the first formal does not require finalization
3251 -- actions, then this is definitely not [Deep_]Finalize.
3253 if not Needs_Finalization (Typ) then
3257 -- At this point we have the following scenario:
3259 -- procedure Name (Param1 : [in] [out] Ctrl[; Param2 : ...]);
3261 -- Recover the two possible versions of [Deep_]Finalize using the
3262 -- type of the first parameter and compare with the input.
3264 Deep_Fin := TSS (Typ, TSS_Deep_Finalize);
3266 if Is_Controlled (Typ) then
3267 Fin := Find_Prim_Op (Typ, Name_Finalize);
3270 return (Present (Deep_Fin) and then Id = Deep_Fin)
3271 or else (Present (Fin) and then Id = Fin);
3276 end Is_Finalization_Procedure;
3282 procedure Output_Calls
3284 Check_Elab_Flag : Boolean)
3286 function Emit (Flag : Boolean) return Boolean;
3287 -- Determine whether to emit an error message based on the combination
3288 -- of flags Check_Elab_Flag and Flag.
3290 function Is_Printable_Error_Name (Nm : Name_Id) return Boolean;
3291 -- An internal function, used to determine if a name, Nm, is either
3292 -- a non-internal name, or is an internal name that is printable
3293 -- by the error message circuits (i.e. it has a single upper
3294 -- case letter at the end).
3300 function Emit (Flag : Boolean) return Boolean is
3302 if Check_Elab_Flag then
3309 -----------------------------
3310 -- Is_Printable_Error_Name --
3311 -----------------------------
3313 function Is_Printable_Error_Name (Nm : Name_Id) return Boolean is
3315 if not Is_Internal_Name (Nm) then
3318 elsif Name_Len = 1 then
3322 Name_Len := Name_Len - 1;
3323 return not Is_Internal_Name;
3325 end Is_Printable_Error_Name;
3331 -- Start of processing for Output_Calls
3334 for J in reverse 1 .. Elab_Call.Last loop
3335 Error_Msg_Sloc := Elab_Call.Table (J).Cloc;
3337 Ent := Elab_Call.Table (J).Ent;
3339 -- Dynamic elaboration model, warnings controlled by -gnatwl
3341 if Dynamic_Elaboration_Checks then
3342 if Emit (Elab_Warnings) then
3343 if Is_Generic_Unit (Ent) then
3344 Error_Msg_NE ("\\?l?& instantiated #", N, Ent);
3345 elsif Is_Init_Proc (Ent) then
3346 Error_Msg_N ("\\?l?initialization procedure called #", N);
3347 elsif Is_Printable_Error_Name (Chars (Ent)) then
3348 Error_Msg_NE ("\\?l?& called #", N, Ent);
3350 Error_Msg_N ("\\?l?called #", N);
3354 -- Static elaboration model, info messages controlled by -gnatel
3357 if Emit (Elab_Info_Messages) then
3358 if Is_Generic_Unit (Ent) then
3359 Error_Msg_NE ("\\?$?& instantiated #", N, Ent);
3360 elsif Is_Init_Proc (Ent) then
3361 Error_Msg_N ("\\?$?initialization procedure called #", N);
3362 elsif Is_Printable_Error_Name (Chars (Ent)) then
3363 Error_Msg_NE ("\\?$?& called #", N, Ent);
3365 Error_Msg_N ("\\?$?called #", N);
3372 ----------------------------
3373 -- Same_Elaboration_Scope --
3374 ----------------------------
3376 function Same_Elaboration_Scope (Scop1, Scop2 : Entity_Id) return Boolean is
3381 -- Find elaboration scope for Scop1
3382 -- This is either a subprogram or a compilation unit.
3385 while S1 /= Standard_Standard
3386 and then not Is_Compilation_Unit (S1)
3387 and then Ekind_In (S1, E_Package, E_Protected_Type, E_Block)
3392 -- Find elaboration scope for Scop2
3395 while S2 /= Standard_Standard
3396 and then not Is_Compilation_Unit (S2)
3397 and then Ekind_In (S2, E_Package, E_Protected_Type, E_Block)
3403 end Same_Elaboration_Scope;
3409 procedure Set_C_Scope is
3411 while not Is_Compilation_Unit (C_Scope) loop
3412 C_Scope := Scope (C_Scope);
3420 function Spec_Entity (E : Entity_Id) return Entity_Id is
3424 -- Check for case of body entity
3425 -- Why is the check for E_Void needed???
3427 if Ekind_In (E, E_Void, E_Subprogram_Body, E_Package_Body) then
3431 Decl := Parent (Decl);
3432 exit when Nkind (Decl) in N_Proper_Body;
3435 return Corresponding_Spec (Decl);
3446 procedure Supply_Bodies (N : Node_Id) is
3448 if Nkind (N) = N_Subprogram_Declaration then
3450 Ent : constant Entity_Id := Defining_Unit_Name (Specification (N));
3453 -- Internal subprograms will already have a generated body, so
3454 -- there is no need to provide a stub for them.
3456 if No (Corresponding_Body (N)) then
3458 Loc : constant Source_Ptr := Sloc (N);
3460 Formals : constant List_Id := Copy_Parameter_List (Ent);
3461 Nam : constant Entity_Id :=
3462 Make_Defining_Identifier (Loc, Chars (Ent));
3464 Stats : constant List_Id :=
3466 (Make_Raise_Program_Error (Loc,
3467 Reason => PE_Access_Before_Elaboration));
3470 if Ekind (Ent) = E_Function then
3472 Make_Function_Specification (Loc,
3473 Defining_Unit_Name => Nam,
3474 Parameter_Specifications => Formals,
3475 Result_Definition =>
3477 (Result_Definition (Specification (N))));
3479 -- We cannot reliably make a return statement for this
3480 -- body, but none is needed because the call raises
3483 Set_Return_Present (Ent);
3487 Make_Procedure_Specification (Loc,
3488 Defining_Unit_Name => Nam,
3489 Parameter_Specifications => Formals);
3492 B := Make_Subprogram_Body (Loc,
3493 Specification => Spec,
3494 Declarations => New_List,
3495 Handled_Statement_Sequence =>
3496 Make_Handled_Sequence_Of_Statements (Loc, Stats));
3497 Insert_After (N, B);
3503 elsif Nkind (N) = N_Package_Declaration then
3505 Spec : constant Node_Id := Specification (N);
3507 Push_Scope (Defining_Unit_Name (Spec));
3508 Supply_Bodies (Visible_Declarations (Spec));
3509 Supply_Bodies (Private_Declarations (Spec));
3515 procedure Supply_Bodies (L : List_Id) is
3520 while Present (Elmt) loop
3521 Supply_Bodies (Elmt);
3531 function Within (E1, E2 : Entity_Id) return Boolean is
3538 elsif Scop = Standard_Standard then
3541 Scop := Scope (Scop);
3546 --------------------------
3547 -- Within_Elaborate_All --
3548 --------------------------
3550 function Within_Elaborate_All
3551 (Unit : Unit_Number_Type;
3552 E : Entity_Id) return Boolean
3554 type Unit_Number_Set is array (Main_Unit .. Last_Unit) of Boolean;
3555 pragma Pack (Unit_Number_Set);
3557 Seen : Unit_Number_Set := (others => False);
3558 -- Seen (X) is True after we have seen unit X in the walk. This is used
3559 -- to prevent processing the same unit more than once.
3561 Result : Boolean := False;
3563 procedure Helper (Unit : Unit_Number_Type);
3564 -- This helper procedure does all the work for Within_Elaborate_All. It
3565 -- walks the dependency graph, and sets Result to True if it finds an
3566 -- appropriate Elaborate_All.
3572 procedure Helper (Unit : Unit_Number_Type) is
3573 CU : constant Node_Id := Cunit (Unit);
3577 Elab_Id : Entity_Id;
3584 Seen (Unit) := True;
3587 -- First, check for Elaborate_Alls on this unit
3589 Item := First (Context_Items (CU));
3590 while Present (Item) loop
3591 if Nkind (Item) = N_Pragma
3592 and then Pragma_Name (Item) = Name_Elaborate_All
3594 -- Return if some previous error on the pragma itself. The
3595 -- pragma may be unanalyzed, because of a previous error, or
3596 -- if it is the context of a subunit, inherited by its parent.
3598 if Error_Posted (Item) or else not Analyzed (Item) then
3604 (Expression (First (Pragma_Argument_Associations (Item))));
3611 Par := Parent (Unit_Declaration_Node (Elab_Id));
3613 Item2 := First (Context_Items (Par));
3614 while Present (Item2) loop
3615 if Nkind (Item2) = N_With_Clause
3616 and then Entity (Name (Item2)) = E
3617 and then not Limited_Present (Item2)
3630 -- Second, recurse on with's. We could do this as part of the above
3631 -- loop, but it's probably more efficient to have two loops, because
3632 -- the relevant Elaborate_All is likely to be on the initial unit. In
3633 -- other words, we're walking the with's breadth-first. This part is
3634 -- only necessary in the dynamic elaboration model.
3636 if Dynamic_Elaboration_Checks then
3637 Item := First (Context_Items (CU));
3638 while Present (Item) loop
3639 if Nkind (Item) = N_With_Clause
3640 and then not Limited_Present (Item)
3642 -- Note: the following call to Get_Cunit_Unit_Number does a
3643 -- linear search, which could be slow, but it's OK because
3644 -- we're about to give a warning anyway. Also, there might
3645 -- be hundreds of units, but not millions. If it turns out
3646 -- to be a problem, we could store the Get_Cunit_Unit_Number
3647 -- in each N_Compilation_Unit node, but that would involve
3648 -- rearranging N_Compilation_Unit_Aux to make room.
3650 Helper (Get_Cunit_Unit_Number (Library_Unit (Item)));
3662 -- Start of processing for Within_Elaborate_All
3667 end Within_Elaborate_All;