1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1997-2011, 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_Cat; use Sem_Cat;
47 with Sem_Ch7; use Sem_Ch7;
48 with Sem_Ch8; use Sem_Ch8;
49 with Sem_Res; use Sem_Res;
50 with Sem_Type; use Sem_Type;
51 with Sem_Util; use Sem_Util;
52 with Sinfo; use Sinfo;
53 with Sinput; use Sinput;
54 with Snames; use Snames;
55 with Stand; use Stand;
57 with Tbuild; use Tbuild;
58 with Uintp; use Uintp;
59 with Uname; use Uname;
61 package body Sem_Elab is
63 -- The following table records the recursive call chain for output in the
64 -- Output routine. Each entry records the call node and the entity of the
65 -- called routine. The number of entries in the table (i.e. the value of
66 -- Elab_Call.Last) indicates the current depth of recursion and is used to
67 -- identify the outer level.
69 type Elab_Call_Entry is record
74 package Elab_Call is new Table.Table (
75 Table_Component_Type => Elab_Call_Entry,
76 Table_Index_Type => Int,
79 Table_Increment => 100,
80 Table_Name => "Elab_Call");
82 -- This table is initialized at the start of each outer level call. It
83 -- holds the entities for all subprograms that have been examined for this
84 -- particular outer level call, and is used to prevent both infinite
85 -- recursion, and useless reanalysis of bodies already seen
87 package Elab_Visited is new Table.Table (
88 Table_Component_Type => Entity_Id,
89 Table_Index_Type => Int,
92 Table_Increment => 100,
93 Table_Name => "Elab_Visited");
95 -- This table stores calls to Check_Internal_Call that are delayed
96 -- until all generics are instantiated, and in particular that all
97 -- generic bodies have been inserted. We need to delay, because we
98 -- need to be able to look through the inserted bodies.
100 type Delay_Element is record
102 -- The parameter N from the call to Check_Internal_Call. Note that
103 -- this node may get rewritten over the delay period by expansion
104 -- in the call case (but not in the instantiation case).
107 -- The parameter E from the call to Check_Internal_Call
109 Orig_Ent : Entity_Id;
110 -- The parameter Orig_Ent from the call to Check_Internal_Call
113 -- The current scope of the call. This is restored when we complete
114 -- the delayed call, so that we do this in the right scope.
116 From_Elab_Code : Boolean;
117 -- Save indication of whether this call is from elaboration code
119 Outer_Scope : Entity_Id;
120 -- Save scope of outer level call
123 package Delay_Check is new Table.Table (
124 Table_Component_Type => Delay_Element,
125 Table_Index_Type => Int,
126 Table_Low_Bound => 1,
127 Table_Initial => 1000,
128 Table_Increment => 100,
129 Table_Name => "Delay_Check");
132 -- Top level scope of current scope. Compute this only once at the outer
133 -- level, i.e. for a call to Check_Elab_Call from outside this unit.
135 Outer_Level_Sloc : Source_Ptr;
136 -- Save Sloc value for outer level call node for comparisons of source
137 -- locations. A body is too late if it appears after the *outer* level
138 -- call, not the particular call that is being analyzed.
140 From_Elab_Code : Boolean;
141 -- This flag shows whether the outer level call currently being examined
142 -- is or is not in elaboration code. We are only interested in calls to
143 -- routines in other units if this flag is True.
145 In_Task_Activation : Boolean := False;
146 -- This flag indicates whether we are performing elaboration checks on
147 -- task procedures, at the point of activation. If true, we do not trace
148 -- internal calls in these procedures, because all local bodies are known
151 Delaying_Elab_Checks : Boolean := True;
152 -- This is set True till the compilation is complete, including the
153 -- insertion of all instance bodies. Then when Check_Elab_Calls is called,
154 -- the delay table is used to make the delayed calls and this flag is reset
155 -- to False, so that the calls are processed
157 -----------------------
158 -- Local Subprograms --
159 -----------------------
161 -- Note: Outer_Scope in all following specs represents the scope of
162 -- interest of the outer level call. If it is set to Standard_Standard,
163 -- then it means the outer level call was at elaboration level, and that
164 -- thus all calls are of interest. If it was set to some other scope,
165 -- then the original call was an inner call, and we are not interested
166 -- in calls that go outside this scope.
168 procedure Activate_Elaborate_All_Desirable (N : Node_Id; U : Entity_Id);
169 -- Analysis of construct N shows that we should set Elaborate_All_Desirable
170 -- for the WITH clause for unit U (which will always be present). A special
171 -- case is when N is a function or procedure instantiation, in which case
172 -- it is sufficient to set Elaborate_Desirable, since in this case there is
173 -- no possibility of transitive elaboration issues.
175 procedure Check_A_Call
178 Outer_Scope : Entity_Id;
179 Inter_Unit_Only : Boolean;
180 Generate_Warnings : Boolean := True;
181 In_Init_Proc : Boolean := False);
182 -- This is the internal recursive routine that is called to check for a
183 -- possible elaboration error. The argument N is a subprogram call or
184 -- generic instantiation to be checked, and E is the entity of the called
185 -- subprogram, or instantiated generic unit. The flag Outer_Scope is the
186 -- outer level scope for the original call. Inter_Unit_Only is set if the
187 -- call is only to be checked in the case where it is to another unit (and
188 -- skipped if within a unit). Generate_Warnings is set to False to suppress
189 -- warning messages about missing pragma Elaborate_All's. These messages
190 -- are not wanted for inner calls in the dynamic model. Flag In_Init_Proc
191 -- should be set whenever the current context is a type init proc.
193 procedure Check_Bad_Instantiation (N : Node_Id);
194 -- N is a node for an instantiation (if called with any other node kind,
195 -- Check_Bad_Instantiation ignores the call). This subprogram checks for
196 -- the special case of a generic instantiation of a generic spec in the
197 -- same declarative part as the instantiation where a body is present and
198 -- has not yet been seen. This is an obvious error, but needs to be checked
199 -- specially at the time of the instantiation, since it is a case where we
200 -- cannot insert the body anywhere. If this case is detected, warnings are
201 -- generated, and a raise of Program_Error is inserted. In addition any
202 -- subprograms in the generic spec are stubbed, and the Bad_Instantiation
203 -- flag is set on the instantiation node. The caller in Sem_Ch12 uses this
204 -- flag as an indication that no attempt should be made to insert an
207 procedure Check_Internal_Call
210 Outer_Scope : Entity_Id;
211 Orig_Ent : Entity_Id);
212 -- N is a function call or procedure statement call node and E is the
213 -- entity of the called function, which is within the current compilation
214 -- unit (where subunits count as part of the parent). This call checks if
215 -- this call, or any call within any accessed body could cause an ABE, and
216 -- if so, outputs a warning. Orig_Ent differs from E only in the case of
217 -- renamings, and points to the original name of the entity. This is used
218 -- for error messages. Outer_Scope is the outer level scope for the
221 procedure Check_Internal_Call_Continue
224 Outer_Scope : Entity_Id;
225 Orig_Ent : Entity_Id);
226 -- The processing for Check_Internal_Call is divided up into two phases,
227 -- and this represents the second phase. The second phase is delayed if
228 -- Delaying_Elab_Calls is set to True. In this delayed case, the first
229 -- phase makes an entry in the Delay_Check table, which is processed when
230 -- Check_Elab_Calls is called. N, E and Orig_Ent are as for the call to
231 -- Check_Internal_Call. Outer_Scope is the outer level scope for the
234 function Has_Generic_Body (N : Node_Id) return Boolean;
235 -- N is a generic package instantiation node, and this routine determines
236 -- if this package spec does in fact have a generic body. If so, then
237 -- True is returned, otherwise False. Note that this is not at all the
238 -- same as checking if the unit requires a body, since it deals with
239 -- the case of optional bodies accurately (i.e. if a body is optional,
240 -- then it looks to see if a body is actually present). Note: this
241 -- function can only do a fully correct job if in generating code mode
242 -- where all bodies have to be present. If we are operating in semantics
243 -- check only mode, then in some cases of optional bodies, a result of
244 -- False may incorrectly be given. In practice this simply means that
245 -- some cases of warnings for incorrect order of elaboration will only
246 -- be given when generating code, which is not a big problem (and is
247 -- inevitable, given the optional body semantics of Ada).
249 procedure Insert_Elab_Check (N : Node_Id; C : Node_Id := Empty);
250 -- Given code for an elaboration check (or unconditional raise if the check
251 -- is not needed), inserts the code in the appropriate place. N is the call
252 -- or instantiation node for which the check code is required. C is the
253 -- test whose failure triggers the raise.
255 function Is_Finalization_Procedure (Id : Entity_Id) return Boolean;
256 -- Determine whether entity Id denotes a [Deep_]Finalize procedure
258 procedure Output_Calls (N : Node_Id);
259 -- Outputs chain of calls stored in the Elab_Call table. The caller has
260 -- already generated the main warning message, so the warnings generated
261 -- are all continuation messages. The argument is the call node at which
262 -- the messages are to be placed.
264 function Same_Elaboration_Scope (Scop1, Scop2 : Entity_Id) return Boolean;
265 -- Given two scopes, determine whether they are the same scope from an
266 -- elaboration point of view, i.e. packages and blocks are ignored.
268 procedure Set_C_Scope;
269 -- On entry C_Scope is set to some scope. On return, C_Scope is reset
270 -- to be the enclosing compilation unit of this scope.
272 procedure Set_Elaboration_Constraint
276 -- The current unit U may depend semantically on some unit P which is not
277 -- in the current context. If there is an elaboration call that reaches P,
278 -- we need to indicate that P requires an Elaborate_All, but this is not
279 -- effective in U's ali file, if there is no with_clause for P. In this
280 -- case we add the Elaborate_All on the unit Q that directly or indirectly
281 -- makes P available. This can happen in two cases:
283 -- a) Q declares a subtype of a type declared in P, and the call is an
284 -- initialization call for an object of that subtype.
286 -- b) Q declares an object of some tagged type whose root type is
287 -- declared in P, and the initialization call uses object notation on
288 -- that object to reach a primitive operation or a classwide operation
291 -- If P appears in the context of U, the current processing is correct.
292 -- Otherwise we must identify these two cases to retrieve Q and place the
293 -- Elaborate_All_Desirable on it.
295 function Spec_Entity (E : Entity_Id) return Entity_Id;
296 -- Given a compilation unit entity, if it is a spec entity, it is returned
297 -- unchanged. If it is a body entity, then the spec for the corresponding
300 procedure Supply_Bodies (N : Node_Id);
301 -- Given a node, N, that is either a subprogram declaration or a package
302 -- declaration, this procedure supplies dummy bodies for the subprogram
303 -- or for all subprograms in the package. If the given node is not one
304 -- of these two possibilities, then Supply_Bodies does nothing. The
305 -- dummy body contains a single Raise statement.
307 procedure Supply_Bodies (L : List_Id);
308 -- Calls Supply_Bodies for all elements of the given list L
310 function Within (E1, E2 : Entity_Id) return Boolean;
311 -- Given two scopes E1 and E2, returns True if E1 is equal to E2, or is one
312 -- of its contained scopes, False otherwise.
314 function Within_Elaborate_All (E : Entity_Id) return Boolean;
315 -- Before emitting a warning on a scope E for a missing elaborate_all,
316 -- check whether E may be in the context of a directly visible unit U to
317 -- which the pragma applies. This prevents spurious warnings when the
318 -- called entity is renamed within U.
320 --------------------------------------
321 -- Activate_Elaborate_All_Desirable --
322 --------------------------------------
324 procedure Activate_Elaborate_All_Desirable (N : Node_Id; U : Entity_Id) is
325 UN : constant Unit_Number_Type := Get_Code_Unit (N);
326 CU : constant Node_Id := Cunit (UN);
327 UE : constant Entity_Id := Cunit_Entity (UN);
328 Unm : constant Unit_Name_Type := Unit_Name (UN);
329 CI : constant List_Id := Context_Items (CU);
333 procedure Add_To_Context_And_Mark (Itm : Node_Id);
334 -- This procedure is called when the elaborate indication must be
335 -- applied to a unit not in the context of the referencing unit. The
336 -- unit gets added to the context as an implicit with.
338 function In_Withs_Of (UEs : Entity_Id) return Boolean;
339 -- UEs is the spec entity of a unit. If the unit to be marked is
340 -- in the context item list of this unit spec, then the call returns
341 -- True and Itm is left set to point to the relevant N_With_Clause node.
343 procedure Set_Elab_Flag (Itm : Node_Id);
344 -- Sets Elaborate_[All_]Desirable as appropriate on Itm
346 -----------------------------
347 -- Add_To_Context_And_Mark --
348 -----------------------------
350 procedure Add_To_Context_And_Mark (Itm : Node_Id) is
351 CW : constant Node_Id :=
352 Make_With_Clause (Sloc (Itm),
356 Set_Library_Unit (CW, Library_Unit (Itm));
357 Set_Implicit_With (CW, True);
359 -- Set elaborate all desirable on copy and then append the copy to
360 -- the list of body with's and we are done.
364 end Add_To_Context_And_Mark;
370 function In_Withs_Of (UEs : Entity_Id) return Boolean is
371 UNs : constant Unit_Number_Type := Get_Source_Unit (UEs);
372 CUs : constant Node_Id := Cunit (UNs);
373 CIs : constant List_Id := Context_Items (CUs);
377 while Present (Itm) loop
378 if Nkind (Itm) = N_With_Clause then
380 Cunit_Entity (Get_Cunit_Unit_Number (Library_Unit (Itm)));
397 procedure Set_Elab_Flag (Itm : Node_Id) is
399 if Nkind (N) in N_Subprogram_Instantiation then
400 Set_Elaborate_Desirable (Itm);
402 Set_Elaborate_All_Desirable (Itm);
406 -- Start of processing for Activate_Elaborate_All_Desirable
409 -- Do not set binder indication if expansion is disabled, as when
410 -- compiling a generic unit.
412 if not Expander_Active then
417 while Present (Itm) loop
418 if Nkind (Itm) = N_With_Clause then
419 Ent := Cunit_Entity (Get_Cunit_Unit_Number (Library_Unit (Itm)));
421 -- If we find it, then mark elaborate all desirable and return
432 -- If we fall through then the with clause is not present in the
433 -- current unit. One legitimate possibility is that the with clause
434 -- is present in the spec when we are a body.
436 if Is_Body_Name (Unm)
437 and then In_Withs_Of (Spec_Entity (UE))
439 Add_To_Context_And_Mark (Itm);
443 -- Similarly, we may be in the spec or body of a child unit, where
444 -- the unit in question is with'ed by some ancestor of the child unit.
446 if Is_Child_Name (Unm) then
454 exit when Pkg = Standard_Standard;
456 if In_Withs_Of (Pkg) then
457 Add_To_Context_And_Mark (Itm);
464 -- Here if we do not find with clause on spec or body. We just ignore
465 -- this case, it means that the elaboration involves some other unit
466 -- than the unit being compiled, and will be caught elsewhere.
469 end Activate_Elaborate_All_Desirable;
475 procedure Check_A_Call
478 Outer_Scope : Entity_Id;
479 Inter_Unit_Only : Boolean;
480 Generate_Warnings : Boolean := True;
481 In_Init_Proc : Boolean := False)
483 Loc : constant Source_Ptr := Sloc (N);
488 -- Top level scope of entity for called subprogram. This value includes
489 -- following renamings and derivations, so this scope can be in a
490 -- non-visible unit. This is the scope that is to be investigated to
491 -- see whether an elaboration check is required.
494 -- Top level scope of directly called entity for subprogram. This
495 -- differs from E_Scope in the case where renamings or derivations
496 -- are involved, since it does not follow these links. W_Scope is
497 -- generally in a visible unit, and it is this scope that may require
498 -- an Elaborate_All. However, there are some cases (initialization
499 -- calls and calls involving object notation) where W_Scope might not
500 -- be in the context of the current unit, and there is an intermediate
501 -- package that is, in which case the Elaborate_All has to be placed
502 -- on this intermediate package. These special cases are handled in
503 -- Set_Elaboration_Constraint.
505 Body_Acts_As_Spec : Boolean;
506 -- Set to true if call is to body acting as spec (no separate spec)
508 Inst_Case : constant Boolean := Nkind (N) in N_Generic_Instantiation;
509 -- Indicates if we have instantiation case
511 Caller_Unit_Internal : Boolean;
512 Callee_Unit_Internal : Boolean;
514 Inst_Caller : Source_Ptr;
515 Inst_Callee : Source_Ptr;
517 Unit_Caller : Unit_Number_Type;
518 Unit_Callee : Unit_Number_Type;
520 Cunit_SC : Boolean := False;
521 -- Set to suppress dynamic elaboration checks where one of the
522 -- enclosing scopes has Elaboration_Checks_Suppressed set, or else
523 -- if a pragma Elaborate (_All) applies to that scope, in which case
524 -- warnings on the scope are also suppressed. For the internal case,
525 -- we ignore this flag.
528 -- If the call is known to be within a local Suppress Elaboration
529 -- pragma, nothing to check. This can happen in task bodies.
531 if (Nkind (N) = N_Function_Call
532 or else Nkind (N) = N_Procedure_Call_Statement)
533 and then No_Elaboration_Check (N)
538 -- Go to parent for derived subprogram, or to original subprogram in the
539 -- case of a renaming (Alias covers both these cases).
543 if (Suppress_Elaboration_Warnings (Ent)
544 or else Elaboration_Checks_Suppressed (Ent))
545 and then (Inst_Case or else No (Alias (Ent)))
550 -- Nothing to do for imported entities
552 if Is_Imported (Ent) then
556 exit when Inst_Case or else No (Alias (Ent));
560 Decl := Unit_Declaration_Node (Ent);
562 if Nkind (Decl) = N_Subprogram_Body then
563 Body_Acts_As_Spec := True;
565 elsif Nkind (Decl) = N_Subprogram_Declaration
566 or else Nkind (Decl) = N_Subprogram_Body_Stub
569 Body_Acts_As_Spec := False;
571 -- If we have none of an instantiation, subprogram body or
572 -- subprogram declaration, then it is not a case that we want
573 -- to check. (One case is a call to a generic formal subprogram,
574 -- where we do not want the check in the template).
582 if Elaboration_Checks_Suppressed (E_Scope)
583 or else Suppress_Elaboration_Warnings (E_Scope)
588 -- Exit when we get to compilation unit, not counting subunits
590 exit when Is_Compilation_Unit (E_Scope)
591 and then (Is_Child_Unit (E_Scope)
592 or else Scope (E_Scope) = Standard_Standard);
594 -- If we did not find a compilation unit, other than standard,
595 -- then nothing to check (happens in some instantiation cases)
597 if E_Scope = Standard_Standard then
600 -- Otherwise move up a scope looking for compilation unit
603 E_Scope := Scope (E_Scope);
607 -- No checks needed for pure or preelaborated compilation units
609 if Is_Pure (E_Scope) or else Is_Preelaborated (E_Scope) then
613 -- If the generic entity is within a deeper instance than we are, then
614 -- either the instantiation to which we refer itself caused an ABE, in
615 -- which case that will be handled separately, or else we know that the
616 -- body we need appears as needed at the point of the instantiation.
617 -- However, this assumption is only valid if we are in static mode.
619 if not Dynamic_Elaboration_Checks
620 and then Instantiation_Depth (Sloc (Ent)) >
621 Instantiation_Depth (Sloc (N))
626 -- Do not give a warning for a package with no body
628 if Ekind (Ent) = E_Generic_Package
629 and then not Has_Generic_Body (N)
634 -- Case of entity is not in current unit (i.e. with'ed unit case)
636 if E_Scope /= C_Scope then
638 -- We are only interested in such calls if the outer call was from
639 -- elaboration code, or if we are in Dynamic_Elaboration_Checks mode.
641 if not From_Elab_Code and then not Dynamic_Elaboration_Checks then
645 -- Nothing to do if some scope said that no checks were required
651 -- Nothing to do for a generic instance, because in this case the
652 -- checking was at the point of instantiation of the generic However,
653 -- this shortcut is only applicable in static mode.
655 if Is_Generic_Instance (Ent) and not Dynamic_Elaboration_Checks then
659 -- Nothing to do if subprogram with no separate spec. However, a
660 -- call to Deep_Initialize may result in a call to a user-defined
661 -- Initialize procedure, which imposes a body dependency. This
662 -- happens only if the type is controlled and the Initialize
663 -- procedure is not inherited.
665 if Body_Acts_As_Spec then
666 if Is_TSS (Ent, TSS_Deep_Initialize) then
668 Typ : constant Entity_Id := Etype (First_Formal (Ent));
672 if not Is_Controlled (Typ) then
675 Init := Find_Prim_Op (Typ, Name_Initialize);
677 if Comes_From_Source (Init) then
690 -- Check cases of internal units
692 Callee_Unit_Internal :=
693 Is_Internal_File_Name
694 (Unit_File_Name (Get_Source_Unit (E_Scope)));
696 -- Do not give a warning if the with'ed unit is internal
697 -- and this is the generic instantiation case (this saves a
698 -- lot of hassle dealing with the Text_IO special child units)
700 if Callee_Unit_Internal and Inst_Case then
704 if C_Scope = Standard_Standard then
705 Caller_Unit_Internal := False;
707 Caller_Unit_Internal :=
708 Is_Internal_File_Name
709 (Unit_File_Name (Get_Source_Unit (C_Scope)));
712 -- Do not give a warning if the with'ed unit is internal
713 -- and the caller is not internal (since the binder always
714 -- elaborates internal units first).
716 if Callee_Unit_Internal and (not Caller_Unit_Internal) then
720 -- For now, if debug flag -gnatdE is not set, do no checking for
721 -- one internal unit withing another. This fixes the problem with
722 -- the sgi build and storage errors. To be resolved later ???
724 if (Callee_Unit_Internal and Caller_Unit_Internal)
725 and then not Debug_Flag_EE
730 if Is_TSS (E, TSS_Deep_Initialize) then
734 -- If the call is in an instance, and the called entity is not
735 -- defined in the same instance, then the elaboration issue
736 -- focuses around the unit containing the template, it is
737 -- this unit which requires an Elaborate_All.
739 -- However, if we are doing dynamic elaboration, we need to
740 -- chase the call in the usual manner.
742 -- We do not handle the case of calling a generic formal correctly
743 -- in the static case. See test 4703-004 to explore this gap ???
745 Inst_Caller := Instantiation (Get_Source_File_Index (Sloc (N)));
746 Inst_Callee := Instantiation (Get_Source_File_Index (Sloc (Ent)));
748 if Inst_Caller = No_Location then
749 Unit_Caller := No_Unit;
751 Unit_Caller := Get_Source_Unit (N);
754 if Inst_Callee = No_Location then
755 Unit_Callee := No_Unit;
757 Unit_Callee := Get_Source_Unit (Ent);
760 if Unit_Caller /= No_Unit
761 and then Unit_Callee /= Unit_Caller
762 and then not Dynamic_Elaboration_Checks
764 E_Scope := Spec_Entity (Cunit_Entity (Unit_Caller));
766 -- If we don't get a spec entity, just ignore call. Not quite
767 -- clear why this check is necessary. ???
773 -- Otherwise step to enclosing compilation unit
775 while not Is_Compilation_Unit (E_Scope) loop
776 E_Scope := Scope (E_Scope);
779 -- For the case N is not an instance, or a call within instance, we
780 -- recompute E_Scope for the error message, since we do NOT want to
781 -- go to the unit which has the ultimate declaration in the case of
782 -- renaming and derivation and we also want to go to the generic unit
783 -- in the case of an instance, and no further.
786 -- Loop to carefully follow renamings and derivations one step
787 -- outside the current unit, but not further.
790 and then Present (Alias (Ent))
792 E_Scope := Alias (Ent);
798 while not Is_Compilation_Unit (E_Scope) loop
799 E_Scope := Scope (E_Scope);
802 -- If E_Scope is the same as C_Scope, it means that there
803 -- definitely was a local renaming or derivation, and we
804 -- are not yet out of the current unit.
806 exit when E_Scope /= C_Scope;
810 -- If no alias, there is a previous error
818 if Within_Elaborate_All (E_Scope) then
822 -- Find top level scope for called entity (not following renamings
823 -- or derivations). This is where the Elaborate_All will go if it
824 -- is needed. We start with the called entity, except in the case
825 -- of an initialization procedure outside the current package, where
826 -- the init proc is in the root package, and we start from the entity
827 -- of the name in the call.
829 if Is_Entity_Name (Name (N))
830 and then Is_Init_Proc (Entity (Name (N)))
831 and then not In_Same_Extended_Unit (N, Entity (Name (N)))
833 W_Scope := Scope (Entity (Name (N)));
838 while not Is_Compilation_Unit (W_Scope) loop
839 W_Scope := Scope (W_Scope);
842 -- Now check if an elaborate_all (or dynamic check) is needed
844 if not Suppress_Elaboration_Warnings (Ent)
845 and then not Elaboration_Checks_Suppressed (Ent)
846 and then not Suppress_Elaboration_Warnings (E_Scope)
847 and then not Elaboration_Checks_Suppressed (E_Scope)
848 and then Elab_Warnings
849 and then Generate_Warnings
851 Generate_Elab_Warnings : declare
852 procedure Elab_Warning
855 Ent : Node_Or_Entity_Id);
856 -- Generate a call to Error_Msg_NE with parameters Msg_D or
857 -- Msg_S (for dynamic or static elaboration model), N and Ent.
863 procedure Elab_Warning
866 Ent : Node_Or_Entity_Id)
869 if Dynamic_Elaboration_Checks then
870 Error_Msg_NE (Msg_D, N, Ent);
872 Error_Msg_NE (Msg_S, N, Ent);
876 -- Start of processing for Generate_Elab_Warnings
881 ("instantiation of& may raise Program_Error?",
882 "info: instantiation of& during elaboration?", Ent);
885 if Nkind (Name (N)) in N_Has_Entity
886 and then Is_Init_Proc (Entity (Name (N)))
887 and then Comes_From_Source (Ent)
890 ("implicit call to & may raise Program_Error?",
891 "info: implicit call to & during elaboration?",
896 ("call to & may raise Program_Error?",
897 "info: call to & during elaboration?",
902 Error_Msg_Qual_Level := Nat'Last;
904 if Nkind (N) in N_Subprogram_Instantiation then
906 ("\missing pragma Elaborate for&?",
907 "\info: implicit pragma Elaborate for& generated?",
911 ("\missing pragma Elaborate_All for&?",
912 "\info: implicit pragma Elaborate_All for & generated?",
915 end Generate_Elab_Warnings;
917 Error_Msg_Qual_Level := 0;
920 -- Set flag to prevent further warnings for same unit unless in
923 if not All_Errors_Mode and not Dynamic_Elaboration_Checks then
924 Set_Suppress_Elaboration_Warnings (W_Scope, True);
928 -- Check for runtime elaboration check required
930 if Dynamic_Elaboration_Checks then
931 if not Elaboration_Checks_Suppressed (Ent)
932 and then not Elaboration_Checks_Suppressed (W_Scope)
933 and then not Elaboration_Checks_Suppressed (E_Scope)
934 and then not Cunit_SC
936 -- Runtime elaboration check required. Generate check of the
937 -- elaboration Boolean for the unit containing the entity.
939 -- Note that for this case, we do check the real unit (the one
940 -- from following renamings, since that is the issue!)
942 -- Could this possibly miss a useless but required PE???
944 Insert_Elab_Check (N,
945 Make_Attribute_Reference (Loc,
946 Attribute_Name => Name_Elaborated,
947 Prefix => New_Occurrence_Of (Spec_Entity (E_Scope), Loc)));
949 -- Prevent duplicate elaboration checks on the same call,
950 -- which can happen if the body enclosing the call appears
951 -- itself in a call whose elaboration check is delayed.
953 if Nkind_In (N, N_Function_Call,
954 N_Procedure_Call_Statement)
956 Set_No_Elaboration_Check (N);
960 -- Case of static elaboration model
963 -- Do not do anything if elaboration checks suppressed. Note that
964 -- we check Ent here, not E, since we want the real entity for the
965 -- body to see if checks are suppressed for it, not the dummy
966 -- entry for renamings or derivations.
968 if Elaboration_Checks_Suppressed (Ent)
969 or else Elaboration_Checks_Suppressed (E_Scope)
970 or else Elaboration_Checks_Suppressed (W_Scope)
974 -- Do not generate an Elaborate_All for finalization routines
975 -- which perform partial clean up as part of initialization.
978 and then Is_Finalization_Procedure (Ent)
982 -- Here we need to generate an implicit elaborate all
985 -- Generate elaborate_all warning unless suppressed
987 if (Elab_Warnings and Generate_Warnings and not Inst_Case)
988 and then not Suppress_Elaboration_Warnings (Ent)
989 and then not Suppress_Elaboration_Warnings (E_Scope)
990 and then not Suppress_Elaboration_Warnings (W_Scope)
992 Error_Msg_Node_2 := W_Scope;
994 ("call to& in elaboration code " &
995 "requires pragma Elaborate_All on&?", N, E);
998 -- Set indication for binder to generate Elaborate_All
1000 Set_Elaboration_Constraint (N, E, W_Scope);
1004 -- Case of entity is in same unit as call or instantiation
1006 elsif not Inter_Unit_Only then
1007 Check_Internal_Call (N, Ent, Outer_Scope, E);
1011 -----------------------------
1012 -- Check_Bad_Instantiation --
1013 -----------------------------
1015 procedure Check_Bad_Instantiation (N : Node_Id) is
1019 -- Nothing to do if we do not have an instantiation (happens in some
1020 -- error cases, and also in the formal package declaration case)
1022 if Nkind (N) not in N_Generic_Instantiation then
1025 -- Nothing to do if serious errors detected (avoid cascaded errors)
1027 elsif Serious_Errors_Detected /= 0 then
1030 -- Nothing to do if not in full analysis mode
1032 elsif not Full_Analysis then
1035 -- Nothing to do if inside a generic template
1037 elsif Inside_A_Generic then
1040 -- Nothing to do if a library level instantiation
1042 elsif Nkind (Parent (N)) = N_Compilation_Unit then
1045 -- Nothing to do if we are compiling a proper body for semantic
1046 -- purposes only. The generic body may be in another proper body.
1049 Nkind (Parent (Unit_Declaration_Node (Main_Unit_Entity))) = N_Subunit
1054 Ent := Get_Generic_Entity (N);
1056 -- The case we are interested in is when the generic spec is in the
1057 -- current declarative part
1059 if not Same_Elaboration_Scope (Current_Scope, Scope (Ent))
1060 or else not In_Same_Extended_Unit (N, Ent)
1065 -- If the generic entity is within a deeper instance than we are, then
1066 -- either the instantiation to which we refer itself caused an ABE, in
1067 -- which case that will be handled separately. Otherwise, we know that
1068 -- the body we need appears as needed at the point of the instantiation.
1069 -- If they are both at the same level but not within the same instance
1070 -- then the body of the generic will be in the earlier instance.
1073 D1 : constant Int := Instantiation_Depth (Sloc (Ent));
1074 D2 : constant Int := Instantiation_Depth (Sloc (N));
1081 and then Is_Generic_Instance (Scope (Ent))
1082 and then not In_Open_Scopes (Scope (Ent))
1088 -- Now we can proceed, if the entity being called has a completion,
1089 -- then we are definitely OK, since we have already seen the body.
1091 if Has_Completion (Ent) then
1095 -- If there is no body, then nothing to do
1097 if not Has_Generic_Body (N) then
1101 -- Here we definitely have a bad instantiation
1104 ("?cannot instantiate& before body seen", N, Ent);
1106 if Present (Instance_Spec (N)) then
1107 Supply_Bodies (Instance_Spec (N));
1111 ("\?Program_Error will be raised at run time", N);
1112 Insert_Elab_Check (N);
1113 Set_ABE_Is_Certain (N);
1114 end Check_Bad_Instantiation;
1116 ---------------------
1117 -- Check_Elab_Call --
1118 ---------------------
1120 procedure Check_Elab_Call
1122 Outer_Scope : Entity_Id := Empty;
1123 In_Init_Proc : Boolean := False)
1128 function Get_Called_Ent return Entity_Id;
1129 -- Retrieve called entity. If this is a call to a protected subprogram,
1130 -- entity is a selected component. The callable entity may be absent,
1131 -- in which case there is no check to perform. This happens with
1132 -- non-analyzed calls in nested generics.
1134 --------------------
1135 -- Get_Called_Ent --
1136 --------------------
1138 function Get_Called_Ent return Entity_Id is
1147 elsif Nkind (Nam) = N_Selected_Component then
1148 return Entity (Selector_Name (Nam));
1150 elsif not Is_Entity_Name (Nam) then
1154 return Entity (Nam);
1158 -- Start of processing for Check_Elab_Call
1161 -- If the call does not come from the main unit, there is nothing to
1162 -- check. Elaboration call from units in the context of the main unit
1163 -- will lead to semantic dependencies when those units are compiled.
1165 if not In_Extended_Main_Code_Unit (N) then
1169 -- For an entry call, check relevant restriction
1171 if Nkind (N) = N_Entry_Call_Statement
1172 and then not In_Subprogram_Or_Concurrent_Unit
1174 Check_Restriction (No_Entry_Calls_In_Elaboration_Code, N);
1176 -- Nothing to do if this is not a call (happens in some error
1177 -- conditions, and in some cases where rewriting occurs).
1179 elsif Nkind (N) /= N_Function_Call
1180 and then Nkind (N) /= N_Procedure_Call_Statement
1184 -- Nothing to do if this is a call already rewritten for elab checking
1186 elsif Nkind (Parent (N)) = N_Conditional_Expression then
1189 -- Nothing to do if inside a generic template
1191 elsif Inside_A_Generic
1192 and then No (Enclosing_Generic_Body (N))
1197 -- Here we have a call at elaboration time which must be checked
1199 if Debug_Flag_LL then
1200 Write_Str (" Check_Elab_Call: ");
1203 or else not Is_Entity_Name (Name (N))
1205 Write_Str ("<<not entity name>> ");
1207 Write_Name (Chars (Entity (Name (N))));
1210 Write_Str (" call at ");
1211 Write_Location (Sloc (N));
1215 -- Climb up the tree to make sure we are not inside default expression
1216 -- of a parameter specification or a record component, since in both
1217 -- these cases, we will be doing the actual call later, not now, and it
1218 -- is at the time of the actual call (statically speaking) that we must
1219 -- do our static check, not at the time of its initial analysis).
1221 -- However, we have to check calls within component definitions (e.g.
1222 -- a function call that determines an array component bound), so we
1223 -- terminate the loop in that case.
1226 while Present (P) loop
1227 if Nkind (P) = N_Parameter_Specification
1229 Nkind (P) = N_Component_Declaration
1233 -- The call occurs within the constraint of a component,
1234 -- so it must be checked.
1236 elsif Nkind (P) = N_Component_Definition then
1244 -- Stuff that happens only at the outer level
1246 if No (Outer_Scope) then
1247 Elab_Visited.Set_Last (0);
1249 -- Nothing to do if current scope is Standard (this is a bit odd, but
1250 -- it happens in the case of generic instantiations).
1252 C_Scope := Current_Scope;
1254 if C_Scope = Standard_Standard then
1258 -- First case, we are in elaboration code
1260 From_Elab_Code := not In_Subprogram_Or_Concurrent_Unit;
1261 if From_Elab_Code then
1263 -- Complain if call that comes from source in preelaborated unit
1264 -- and we are not inside a subprogram (i.e. we are in elab code).
1266 if Comes_From_Source (N)
1267 and then In_Preelaborated_Unit
1268 and then not In_Inlined_Body
1270 -- This is a warning in GNAT mode allowing such calls to be
1271 -- used in the predefined library with appropriate care.
1273 Error_Msg_Warn := GNAT_Mode;
1275 ("<non-static call not allowed in preelaborated unit", N);
1279 -- Second case, we are inside a subprogram or concurrent unit, which
1280 -- means we are not in elaboration code.
1283 -- In this case, the issue is whether we are inside the
1284 -- declarative part of the unit in which we live, or inside its
1285 -- statements. In the latter case, there is no issue of ABE calls
1286 -- at this level (a call from outside to the unit in which we live
1287 -- might cause an ABE, but that will be detected when we analyze
1288 -- that outer level call, as it recurses into the called unit).
1290 -- Climb up the tree, doing this test, and also testing for being
1291 -- inside a default expression, which, as discussed above, is not
1292 -- checked at this stage.
1301 -- If we find a parentless subtree, it seems safe to assume
1302 -- that we are not in a declarative part and that no
1303 -- checking is required.
1309 if Is_List_Member (P) then
1310 L := List_Containing (P);
1317 exit when Nkind (P) = N_Subunit;
1319 -- Filter out case of default expressions, where we do not
1320 -- do the check at this stage.
1322 if Nkind (P) = N_Parameter_Specification
1324 Nkind (P) = N_Component_Declaration
1329 -- A protected body has no elaboration code and contains
1330 -- only other bodies.
1332 if Nkind (P) = N_Protected_Body then
1335 elsif Nkind (P) = N_Subprogram_Body
1337 Nkind (P) = N_Task_Body
1339 Nkind (P) = N_Block_Statement
1341 Nkind (P) = N_Entry_Body
1343 if L = Declarations (P) then
1346 -- We are not in elaboration code, but we are doing
1347 -- dynamic elaboration checks, in this case, we still
1348 -- need to do the call, since the subprogram we are in
1349 -- could be called from another unit, also in dynamic
1350 -- elaboration check mode, at elaboration time.
1352 elsif Dynamic_Elaboration_Checks then
1354 -- This is a rather new check, going into version
1355 -- 3.14a1 for the first time (V1.80 of this unit), so
1356 -- we provide a debug flag to enable it. That way we
1357 -- have an easy work around for regressions that are
1358 -- caused by this new check. This debug flag can be
1361 if Debug_Flag_DD then
1365 -- Do the check in this case
1369 elsif Nkind (P) = N_Task_Body then
1371 -- The check is deferred until Check_Task_Activation
1372 -- but we need to capture local suppress pragmas
1373 -- that may inhibit checks on this call.
1375 Ent := Get_Called_Ent;
1380 elsif Elaboration_Checks_Suppressed (Current_Scope)
1381 or else Elaboration_Checks_Suppressed (Ent)
1382 or else Elaboration_Checks_Suppressed (Scope (Ent))
1384 Set_No_Elaboration_Check (N);
1389 -- Static model, call is not in elaboration code, we
1390 -- never need to worry, because in the static model the
1391 -- top level caller always takes care of things.
1402 Ent := Get_Called_Ent;
1408 -- Nothing to do if this is a recursive call (i.e. a call to
1409 -- an entity that is already in the Elab_Call stack)
1411 for J in 1 .. Elab_Visited.Last loop
1412 if Ent = Elab_Visited.Table (J) then
1417 -- See if we need to analyze this call. We analyze it if either of
1418 -- the following conditions is met:
1420 -- It is an inner level call (since in this case it was triggered
1421 -- by an outer level call from elaboration code), but only if the
1422 -- call is within the scope of the original outer level call.
1424 -- It is an outer level call from elaboration code, or the called
1425 -- entity is in the same elaboration scope.
1427 -- And in these cases, we will check both inter-unit calls and
1428 -- intra-unit (within a single unit) calls.
1430 C_Scope := Current_Scope;
1432 -- If not outer level call, then we follow it if it is within the
1433 -- original scope of the outer call.
1435 if Present (Outer_Scope)
1436 and then Within (Scope (Ent), Outer_Scope)
1442 Outer_Scope => Outer_Scope,
1443 Inter_Unit_Only => False,
1444 In_Init_Proc => In_Init_Proc);
1446 elsif Elaboration_Checks_Suppressed (Current_Scope) then
1449 elsif From_Elab_Code then
1451 Check_A_Call (N, Ent, Standard_Standard, Inter_Unit_Only => False);
1453 elsif Same_Elaboration_Scope (C_Scope, Scope (Ent)) then
1455 Check_A_Call (N, Ent, Scope (Ent), Inter_Unit_Only => False);
1457 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode
1458 -- is set, then we will do the check, but only in the inter-unit case
1459 -- (this is to accommodate unguarded elaboration calls from other units
1460 -- in which this same mode is set). We don't want warnings in this case,
1461 -- it would generate warnings having nothing to do with elaboration.
1463 elsif Dynamic_Elaboration_Checks then
1469 Inter_Unit_Only => True,
1470 Generate_Warnings => False);
1472 -- Otherwise nothing to do
1478 -- A call to an Init_Proc in elaboration code may bring additional
1479 -- dependencies, if some of the record components thereof have
1480 -- initializations that are function calls that come from source. We
1481 -- treat the current node as a call to each of these functions, to check
1482 -- their elaboration impact.
1484 if Is_Init_Proc (Ent)
1485 and then From_Elab_Code
1487 Process_Init_Proc : declare
1488 Unit_Decl : constant Node_Id := Unit_Declaration_Node (Ent);
1490 function Check_Init_Call (Nod : Node_Id) return Traverse_Result;
1491 -- Find subprogram calls within body of Init_Proc for Traverse
1492 -- instantiation below.
1494 procedure Traverse_Body is new Traverse_Proc (Check_Init_Call);
1495 -- Traversal procedure to find all calls with body of Init_Proc
1497 ---------------------
1498 -- Check_Init_Call --
1499 ---------------------
1501 function Check_Init_Call (Nod : Node_Id) return Traverse_Result is
1505 if (Nkind (Nod) = N_Function_Call
1506 or else Nkind (Nod) = N_Procedure_Call_Statement)
1507 and then Is_Entity_Name (Name (Nod))
1509 Func := Entity (Name (Nod));
1511 if Comes_From_Source (Func) then
1513 (N, Func, Standard_Standard, Inter_Unit_Only => True);
1521 end Check_Init_Call;
1523 -- Start of processing for Process_Init_Proc
1526 if Nkind (Unit_Decl) = N_Subprogram_Body then
1527 Traverse_Body (Handled_Statement_Sequence (Unit_Decl));
1529 end Process_Init_Proc;
1531 end Check_Elab_Call;
1533 -----------------------
1534 -- Check_Elab_Assign --
1535 -----------------------
1537 procedure Check_Elab_Assign (N : Node_Id) is
1541 Pkg_Spec : Entity_Id;
1542 Pkg_Body : Entity_Id;
1545 -- For record or array component, check prefix. If it is an access type,
1546 -- then there is nothing to do (we do not know what is being assigned),
1547 -- but otherwise this is an assignment to the prefix.
1549 if Nkind (N) = N_Indexed_Component
1551 Nkind (N) = N_Selected_Component
1555 if not Is_Access_Type (Etype (Prefix (N))) then
1556 Check_Elab_Assign (Prefix (N));
1562 -- For type conversion, check expression
1564 if Nkind (N) = N_Type_Conversion then
1565 Check_Elab_Assign (Expression (N));
1569 -- Nothing to do if this is not an entity reference otherwise get entity
1571 if Is_Entity_Name (N) then
1577 -- What we are looking for is a reference in the body of a package that
1578 -- modifies a variable declared in the visible part of the package spec.
1581 and then Comes_From_Source (N)
1582 and then not Suppress_Elaboration_Warnings (Ent)
1583 and then Ekind (Ent) = E_Variable
1584 and then not In_Private_Part (Ent)
1585 and then Is_Library_Level_Entity (Ent)
1587 Scop := Current_Scope;
1589 if No (Scop) or else Scop = Standard_Standard then
1591 elsif Ekind (Scop) = E_Package
1592 and then Is_Compilation_Unit (Scop)
1596 Scop := Scope (Scop);
1600 -- Here Scop points to the containing library package
1603 Pkg_Body := Body_Entity (Pkg_Spec);
1605 -- All OK if the package has an Elaborate_Body pragma
1607 if Has_Pragma_Elaborate_Body (Scop) then
1611 -- OK if entity being modified is not in containing package spec
1613 if not In_Same_Source_Unit (Scop, Ent) then
1617 -- All OK if entity appears in generic package or generic instance.
1618 -- We just get too messed up trying to give proper warnings in the
1619 -- presence of generics. Better no message than a junk one.
1621 Scop := Scope (Ent);
1622 while Present (Scop) and then Scop /= Pkg_Spec loop
1623 if Ekind (Scop) = E_Generic_Package then
1625 elsif Ekind (Scop) = E_Package
1626 and then Is_Generic_Instance (Scop)
1631 Scop := Scope (Scop);
1634 -- All OK if in task, don't issue warnings there
1636 if In_Task_Activation then
1640 -- OK if no package body
1642 if No (Pkg_Body) then
1646 -- OK if reference is not in package body
1648 if not In_Same_Source_Unit (Pkg_Body, N) then
1652 -- OK if package body has no handled statement sequence
1655 HSS : constant Node_Id :=
1656 Handled_Statement_Sequence (Declaration_Node (Pkg_Body));
1658 if No (HSS) or else not Comes_From_Source (HSS) then
1663 -- We definitely have a case of a modification of an entity in
1664 -- the package spec from the elaboration code of the package body.
1665 -- We may not give the warning (because there are some additional
1666 -- checks to avoid too many false positives), but it would be a good
1667 -- idea for the binder to try to keep the body elaboration close to
1668 -- the spec elaboration.
1670 Set_Elaborate_Body_Desirable (Pkg_Spec);
1672 -- All OK in gnat mode (we know what we are doing)
1678 -- All OK if all warnings suppressed
1680 if Warning_Mode = Suppress then
1684 -- All OK if elaboration checks suppressed for entity
1686 if Checks_May_Be_Suppressed (Ent)
1687 and then Is_Check_Suppressed (Ent, Elaboration_Check)
1692 -- OK if the entity is initialized. Note that the No_Initialization
1693 -- flag usually means that the initialization has been rewritten into
1694 -- assignments, but that still counts for us.
1697 Decl : constant Node_Id := Declaration_Node (Ent);
1699 if Nkind (Decl) = N_Object_Declaration
1700 and then (Present (Expression (Decl))
1701 or else No_Initialization (Decl))
1707 -- Here is where we give the warning
1709 -- All OK if warnings suppressed on the entity
1711 if not Has_Warnings_Off (Ent) then
1712 Error_Msg_Sloc := Sloc (Ent);
1715 ("?elaboration code may access& before it is initialized",
1718 ("\?suggest adding pragma Elaborate_Body to spec of &",
1721 ("\?or an explicit initialization could be added #", N);
1724 if not All_Errors_Mode then
1725 Set_Suppress_Elaboration_Warnings (Ent);
1728 end Check_Elab_Assign;
1730 ----------------------
1731 -- Check_Elab_Calls --
1732 ----------------------
1734 procedure Check_Elab_Calls is
1736 -- If expansion is disabled, do not generate any checks. Also skip
1737 -- checks if any subunits are missing because in either case we lack the
1738 -- full information that we need, and no object file will be created in
1741 if not Expander_Active
1742 or else Is_Generic_Unit (Cunit_Entity (Main_Unit))
1743 or else Subunits_Missing
1748 -- Skip delayed calls if we had any errors
1750 if Serious_Errors_Detected = 0 then
1751 Delaying_Elab_Checks := False;
1752 Expander_Mode_Save_And_Set (True);
1754 for J in Delay_Check.First .. Delay_Check.Last loop
1755 Push_Scope (Delay_Check.Table (J).Curscop);
1756 From_Elab_Code := Delay_Check.Table (J).From_Elab_Code;
1758 Check_Internal_Call_Continue (
1759 N => Delay_Check.Table (J).N,
1760 E => Delay_Check.Table (J).E,
1761 Outer_Scope => Delay_Check.Table (J).Outer_Scope,
1762 Orig_Ent => Delay_Check.Table (J).Orig_Ent);
1767 -- Set Delaying_Elab_Checks back on for next main compilation
1769 Expander_Mode_Restore;
1770 Delaying_Elab_Checks := True;
1772 end Check_Elab_Calls;
1774 ------------------------------
1775 -- Check_Elab_Instantiation --
1776 ------------------------------
1778 procedure Check_Elab_Instantiation
1780 Outer_Scope : Entity_Id := Empty)
1785 -- Check for and deal with bad instantiation case. There is some
1786 -- duplicated code here, but we will worry about this later ???
1788 Check_Bad_Instantiation (N);
1790 if ABE_Is_Certain (N) then
1794 -- Nothing to do if we do not have an instantiation (happens in some
1795 -- error cases, and also in the formal package declaration case)
1797 if Nkind (N) not in N_Generic_Instantiation then
1801 -- Nothing to do if inside a generic template
1803 if Inside_A_Generic then
1807 -- Nothing to do if the instantiation is not in the main unit
1809 if not In_Extended_Main_Code_Unit (N) then
1813 Ent := Get_Generic_Entity (N);
1814 From_Elab_Code := not In_Subprogram_Or_Concurrent_Unit;
1816 -- See if we need to analyze this instantiation. We analyze it if
1817 -- either of the following conditions is met:
1819 -- It is an inner level instantiation (since in this case it was
1820 -- triggered by an outer level call from elaboration code), but
1821 -- only if the instantiation is within the scope of the original
1822 -- outer level call.
1824 -- It is an outer level instantiation from elaboration code, or the
1825 -- instantiated entity is in the same elaboration scope.
1827 -- And in these cases, we will check both the inter-unit case and
1828 -- the intra-unit (within a single unit) case.
1830 C_Scope := Current_Scope;
1832 if Present (Outer_Scope)
1833 and then Within (Scope (Ent), Outer_Scope)
1836 Check_A_Call (N, Ent, Outer_Scope, Inter_Unit_Only => False);
1838 elsif From_Elab_Code then
1840 Check_A_Call (N, Ent, Standard_Standard, Inter_Unit_Only => False);
1842 elsif Same_Elaboration_Scope (C_Scope, Scope (Ent)) then
1844 Check_A_Call (N, Ent, Scope (Ent), Inter_Unit_Only => False);
1846 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode is
1847 -- set, then we will do the check, but only in the inter-unit case (this
1848 -- is to accommodate unguarded elaboration calls from other units in
1849 -- which this same mode is set). We inhibit warnings in this case, since
1850 -- this instantiation is not occurring in elaboration code.
1852 elsif Dynamic_Elaboration_Checks then
1858 Inter_Unit_Only => True,
1859 Generate_Warnings => False);
1864 end Check_Elab_Instantiation;
1866 -------------------------
1867 -- Check_Internal_Call --
1868 -------------------------
1870 procedure Check_Internal_Call
1873 Outer_Scope : Entity_Id;
1874 Orig_Ent : Entity_Id)
1876 Inst_Case : constant Boolean := Nkind (N) in N_Generic_Instantiation;
1879 -- If not function or procedure call or instantiation, then ignore
1880 -- call (this happens in some error case and rewriting cases)
1882 if Nkind (N) /= N_Function_Call
1884 Nkind (N) /= N_Procedure_Call_Statement
1890 -- Nothing to do if this is a call or instantiation that has
1891 -- already been found to be a sure ABE
1893 elsif ABE_Is_Certain (N) then
1896 -- Nothing to do if errors already detected (avoid cascaded errors)
1898 elsif Serious_Errors_Detected /= 0 then
1901 -- Nothing to do if not in full analysis mode
1903 elsif not Full_Analysis then
1906 -- Nothing to do if analyzing in special spec-expression mode, since the
1907 -- call is not actually being made at this time.
1909 elsif In_Spec_Expression then
1912 -- Nothing to do for call to intrinsic subprogram
1914 elsif Is_Intrinsic_Subprogram (E) then
1917 -- No need to trace local calls if checking task activation, because
1918 -- other local bodies are elaborated already.
1920 elsif In_Task_Activation then
1923 -- Nothing to do if call is within a generic unit
1925 elsif Inside_A_Generic then
1929 -- Delay this call if we are still delaying calls
1931 if Delaying_Elab_Checks then
1932 Delay_Check.Append (
1935 Orig_Ent => Orig_Ent,
1936 Curscop => Current_Scope,
1937 Outer_Scope => Outer_Scope,
1938 From_Elab_Code => From_Elab_Code));
1941 -- Otherwise, call phase 2 continuation right now
1944 Check_Internal_Call_Continue (N, E, Outer_Scope, Orig_Ent);
1946 end Check_Internal_Call;
1948 ----------------------------------
1949 -- Check_Internal_Call_Continue --
1950 ----------------------------------
1952 procedure Check_Internal_Call_Continue
1955 Outer_Scope : Entity_Id;
1956 Orig_Ent : Entity_Id)
1958 Loc : constant Source_Ptr := Sloc (N);
1959 Inst_Case : constant Boolean := Is_Generic_Unit (E);
1964 function Find_Elab_Reference (N : Node_Id) return Traverse_Result;
1965 -- Function applied to each node as we traverse the body. Checks for
1966 -- call or entity reference that needs checking, and if so checks it.
1967 -- Always returns OK, so entire tree is traversed, except that as
1968 -- described below subprogram bodies are skipped for now.
1970 procedure Traverse is new Atree.Traverse_Proc (Find_Elab_Reference);
1971 -- Traverse procedure using above Find_Elab_Reference function
1973 -------------------------
1974 -- Find_Elab_Reference --
1975 -------------------------
1977 function Find_Elab_Reference (N : Node_Id) return Traverse_Result is
1981 -- If user has specified that there are no entry calls in elaboration
1982 -- code, do not trace past an accept statement, because the rendez-
1983 -- vous will happen after elaboration.
1985 if (Nkind (Original_Node (N)) = N_Accept_Statement
1986 or else Nkind (Original_Node (N)) = N_Selective_Accept)
1987 and then Restriction_Active (No_Entry_Calls_In_Elaboration_Code)
1991 -- If we have a function call, check it
1993 elsif Nkind (N) = N_Function_Call then
1994 Check_Elab_Call (N, Outer_Scope);
1997 -- If we have a procedure call, check the call, and also check
1998 -- arguments that are assignments (OUT or IN OUT mode formals).
2000 elsif Nkind (N) = N_Procedure_Call_Statement then
2001 Check_Elab_Call (N, Outer_Scope, In_Init_Proc => Is_Init_Proc (E));
2003 Actual := First_Actual (N);
2004 while Present (Actual) loop
2005 if Known_To_Be_Assigned (Actual) then
2006 Check_Elab_Assign (Actual);
2009 Next_Actual (Actual);
2014 -- If we have a generic instantiation, check it
2016 elsif Nkind (N) in N_Generic_Instantiation then
2017 Check_Elab_Instantiation (N, Outer_Scope);
2020 -- Skip subprogram bodies that come from source (wait for call to
2021 -- analyze these). The reason for the come from source test is to
2022 -- avoid catching task bodies.
2024 -- For task bodies, we should really avoid these too, waiting for the
2025 -- task activation, but that's too much trouble to catch for now, so
2026 -- we go in unconditionally. This is not so terrible, it means the
2027 -- error backtrace is not quite complete, and we are too eager to
2028 -- scan bodies of tasks that are unused, but this is hardly very
2031 elsif Nkind (N) = N_Subprogram_Body
2032 and then Comes_From_Source (N)
2036 elsif Nkind (N) = N_Assignment_Statement
2037 and then Comes_From_Source (N)
2039 Check_Elab_Assign (Name (N));
2045 end Find_Elab_Reference;
2047 -- Start of processing for Check_Internal_Call_Continue
2050 -- Save outer level call if at outer level
2052 if Elab_Call.Last = 0 then
2053 Outer_Level_Sloc := Loc;
2056 Elab_Visited.Append (E);
2058 -- If the call is to a function that renames a literal, no check
2061 if Ekind (E) = E_Enumeration_Literal then
2065 Sbody := Unit_Declaration_Node (E);
2067 if Nkind (Sbody) /= N_Subprogram_Body
2069 Nkind (Sbody) /= N_Package_Body
2071 Ebody := Corresponding_Body (Sbody);
2076 Sbody := Unit_Declaration_Node (Ebody);
2080 -- If the body appears after the outer level call or instantiation then
2081 -- we have an error case handled below.
2083 if Earlier_In_Extended_Unit (Outer_Level_Sloc, Sloc (Sbody))
2084 and then not In_Task_Activation
2088 -- If we have the instantiation case we are done, since we now
2089 -- know that the body of the generic appeared earlier.
2091 elsif Inst_Case then
2094 -- Otherwise we have a call, so we trace through the called body to see
2095 -- if it has any problems.
2098 pragma Assert (Nkind (Sbody) = N_Subprogram_Body);
2100 Elab_Call.Append ((Cloc => Loc, Ent => E));
2102 if Debug_Flag_LL then
2103 Write_Str ("Elab_Call.Last = ");
2104 Write_Int (Int (Elab_Call.Last));
2105 Write_Str (" Ent = ");
2106 Write_Name (Chars (E));
2108 Write_Location (Sloc (N));
2112 -- Now traverse declarations and statements of subprogram body. Note
2113 -- that we cannot simply Traverse (Sbody), since traverse does not
2114 -- normally visit subprogram bodies.
2119 Decl := First (Declarations (Sbody));
2120 while Present (Decl) loop
2126 Traverse (Handled_Statement_Sequence (Sbody));
2128 Elab_Call.Decrement_Last;
2132 -- Here is the case of calling a subprogram where the body has not yet
2133 -- been encountered, a warning message is needed.
2135 -- If we have nothing in the call stack, then this is at the outer
2136 -- level, and the ABE is bound to occur.
2138 if Elab_Call.Last = 0 then
2141 ("?cannot instantiate& before body seen", N, Orig_Ent);
2144 ("?cannot call& before body seen", N, Orig_Ent);
2148 ("\?Program_Error will be raised at run time", N);
2149 Insert_Elab_Check (N);
2151 -- Call is not at outer level
2154 -- Deal with dynamic elaboration check
2156 if not Elaboration_Checks_Suppressed (E) then
2157 Set_Elaboration_Entity_Required (E);
2159 -- Case of no elaboration entity allocated yet
2161 if No (Elaboration_Entity (E)) then
2163 -- Create object declaration for elaboration entity, and put it
2164 -- just in front of the spec of the subprogram or generic unit,
2165 -- in the same scope as this unit.
2168 Loce : constant Source_Ptr := Sloc (E);
2169 Ent : constant Entity_Id :=
2170 Make_Defining_Identifier (Loc,
2171 Chars => New_External_Name (Chars (E), 'E'));
2174 Set_Elaboration_Entity (E, Ent);
2175 Push_Scope (Scope (E));
2177 Insert_Action (Declaration_Node (E),
2178 Make_Object_Declaration (Loce,
2179 Defining_Identifier => Ent,
2180 Object_Definition =>
2181 New_Occurrence_Of (Standard_Short_Integer, Loce),
2183 Make_Integer_Literal (Loc, Uint_0)));
2185 -- Set elaboration flag at the point of the body
2187 Set_Elaboration_Flag (Sbody, E);
2189 -- Kill current value indication. This is necessary because
2190 -- the tests of this flag are inserted out of sequence and
2191 -- must not pick up bogus indications of the wrong constant
2192 -- value. Also, this is never a true constant, since one way
2193 -- or another, it gets reset.
2195 Set_Current_Value (Ent, Empty);
2196 Set_Last_Assignment (Ent, Empty);
2197 Set_Is_True_Constant (Ent, False);
2202 -- Generate check of the elaboration counter
2204 Insert_Elab_Check (N,
2205 Make_Attribute_Reference (Loc,
2206 Attribute_Name => Name_Elaborated,
2207 Prefix => New_Occurrence_Of (E, Loc)));
2210 -- Generate the warning
2212 if not Suppress_Elaboration_Warnings (E)
2213 and then not Elaboration_Checks_Suppressed (E)
2217 ("instantiation of& may occur before body is seen?",
2221 ("call to& may occur before body is seen?", N, Orig_Ent);
2225 ("\Program_Error may be raised at run time?", N);
2231 -- Set flag to suppress further warnings on same subprogram
2232 -- unless in all errors mode
2234 if not All_Errors_Mode then
2235 Set_Suppress_Elaboration_Warnings (E);
2237 end Check_Internal_Call_Continue;
2239 ---------------------------
2240 -- Check_Task_Activation --
2241 ---------------------------
2243 procedure Check_Task_Activation (N : Node_Id) is
2244 Loc : constant Source_Ptr := Sloc (N);
2245 Inter_Procs : constant Elist_Id := New_Elmt_List;
2246 Intra_Procs : constant Elist_Id := New_Elmt_List;
2249 Task_Scope : Entity_Id;
2250 Cunit_SC : Boolean := False;
2253 Enclosing : Entity_Id;
2255 procedure Add_Task_Proc (Typ : Entity_Id);
2256 -- Add to Task_Procs the task body procedure(s) of task types in Typ.
2257 -- For record types, this procedure recurses over component types.
2259 procedure Collect_Tasks (Decls : List_Id);
2260 -- Collect the types of the tasks that are to be activated in the given
2261 -- list of declarations, in order to perform elaboration checks on the
2262 -- corresponding task procedures which are called implicitly here.
2264 function Outer_Unit (E : Entity_Id) return Entity_Id;
2265 -- find enclosing compilation unit of Entity, ignoring subunits, or
2266 -- else enclosing subprogram. If E is not a package, there is no need
2267 -- for inter-unit elaboration checks.
2273 procedure Add_Task_Proc (Typ : Entity_Id) is
2275 Proc : Entity_Id := Empty;
2278 if Is_Task_Type (Typ) then
2279 Proc := Get_Task_Body_Procedure (Typ);
2281 elsif Is_Array_Type (Typ)
2282 and then Has_Task (Base_Type (Typ))
2284 Add_Task_Proc (Component_Type (Typ));
2286 elsif Is_Record_Type (Typ)
2287 and then Has_Task (Base_Type (Typ))
2289 Comp := First_Component (Typ);
2290 while Present (Comp) loop
2291 Add_Task_Proc (Etype (Comp));
2292 Comp := Next_Component (Comp);
2296 -- If the task type is another unit, we will perform the usual
2297 -- elaboration check on its enclosing unit. If the type is in the
2298 -- same unit, we can trace the task body as for an internal call,
2299 -- but we only need to examine other external calls, because at
2300 -- the point the task is activated, internal subprogram bodies
2301 -- will have been elaborated already. We keep separate lists for
2302 -- each kind of task.
2304 -- Skip this test if errors have occurred, since in this case
2305 -- we can get false indications.
2307 if Serious_Errors_Detected /= 0 then
2311 if Present (Proc) then
2312 if Outer_Unit (Scope (Proc)) = Enclosing then
2314 if No (Corresponding_Body (Unit_Declaration_Node (Proc)))
2316 (not Is_Generic_Instance (Scope (Proc))
2318 Scope (Proc) = Scope (Defining_Identifier (Decl)))
2321 ("task will be activated before elaboration of its body?",
2324 ("\Program_Error will be raised at run time?", Decl);
2327 Present (Corresponding_Body (Unit_Declaration_Node (Proc)))
2329 Append_Elmt (Proc, Intra_Procs);
2333 -- No need for multiple entries of the same type
2335 Elmt := First_Elmt (Inter_Procs);
2336 while Present (Elmt) loop
2337 if Node (Elmt) = Proc then
2344 Append_Elmt (Proc, Inter_Procs);
2353 procedure Collect_Tasks (Decls : List_Id) is
2355 if Present (Decls) then
2356 Decl := First (Decls);
2357 while Present (Decl) loop
2358 if Nkind (Decl) = N_Object_Declaration
2359 and then Has_Task (Etype (Defining_Identifier (Decl)))
2361 Add_Task_Proc (Etype (Defining_Identifier (Decl)));
2373 function Outer_Unit (E : Entity_Id) return Entity_Id is
2378 while Present (Outer) loop
2379 if Elaboration_Checks_Suppressed (Outer) then
2383 exit when Is_Child_Unit (Outer)
2384 or else Scope (Outer) = Standard_Standard
2385 or else Ekind (Outer) /= E_Package;
2386 Outer := Scope (Outer);
2392 -- Start of processing for Check_Task_Activation
2395 Enclosing := Outer_Unit (Current_Scope);
2397 -- Find all tasks declared in the current unit
2399 if Nkind (N) = N_Package_Body then
2400 P := Unit_Declaration_Node (Corresponding_Spec (N));
2402 Collect_Tasks (Declarations (N));
2403 Collect_Tasks (Visible_Declarations (Specification (P)));
2404 Collect_Tasks (Private_Declarations (Specification (P)));
2406 elsif Nkind (N) = N_Package_Declaration then
2407 Collect_Tasks (Visible_Declarations (Specification (N)));
2408 Collect_Tasks (Private_Declarations (Specification (N)));
2411 Collect_Tasks (Declarations (N));
2414 -- We only perform detailed checks in all tasks are library level
2415 -- entities. If the master is a subprogram or task, activation will
2416 -- depend on the activation of the master itself.
2418 -- Should dynamic checks be added in the more general case???
2420 if Ekind (Enclosing) /= E_Package then
2424 -- For task types defined in other units, we want the unit containing
2425 -- the task body to be elaborated before the current one.
2427 Elmt := First_Elmt (Inter_Procs);
2428 while Present (Elmt) loop
2430 Task_Scope := Outer_Unit (Scope (Ent));
2432 if not Is_Compilation_Unit (Task_Scope) then
2435 elsif Suppress_Elaboration_Warnings (Task_Scope)
2436 or else Elaboration_Checks_Suppressed (Task_Scope)
2440 elsif Dynamic_Elaboration_Checks then
2441 if not Elaboration_Checks_Suppressed (Ent)
2442 and then not Cunit_SC
2444 not Restriction_Active (No_Entry_Calls_In_Elaboration_Code)
2446 -- Runtime elaboration check required. Generate check of the
2447 -- elaboration counter for the unit containing the entity.
2449 Insert_Elab_Check (N,
2450 Make_Attribute_Reference (Loc,
2451 Attribute_Name => Name_Elaborated,
2453 New_Occurrence_Of (Spec_Entity (Task_Scope), Loc)));
2457 -- Force the binder to elaborate other unit first
2459 if not Suppress_Elaboration_Warnings (Ent)
2460 and then not Elaboration_Checks_Suppressed (Ent)
2461 and then Elab_Warnings
2462 and then not Suppress_Elaboration_Warnings (Task_Scope)
2463 and then not Elaboration_Checks_Suppressed (Task_Scope)
2465 Error_Msg_Node_2 := Task_Scope;
2467 ("activation of an instance of task type&" &
2468 " requires pragma Elaborate_All on &?", N, Ent);
2471 Activate_Elaborate_All_Desirable (N, Task_Scope);
2472 Set_Suppress_Elaboration_Warnings (Task_Scope);
2478 -- For tasks declared in the current unit, trace other calls within
2479 -- the task procedure bodies, which are available.
2481 In_Task_Activation := True;
2483 Elmt := First_Elmt (Intra_Procs);
2484 while Present (Elmt) loop
2486 Check_Internal_Call_Continue (N, Ent, Enclosing, Ent);
2490 In_Task_Activation := False;
2491 end Check_Task_Activation;
2493 --------------------------------
2494 -- Set_Elaboration_Constraint --
2495 --------------------------------
2497 procedure Set_Elaboration_Constraint
2502 Elab_Unit : Entity_Id;
2503 Init_Call : constant Boolean :=
2504 Chars (Subp) = Name_Initialize
2505 and then Comes_From_Source (Subp)
2506 and then Present (Parameter_Associations (Call))
2507 and then Is_Controlled (Etype (First_Actual (Call)));
2509 -- If the unit is mentioned in a with_clause of the current unit, it is
2510 -- visible, and we can set the elaboration flag.
2512 if Is_Immediately_Visible (Scop)
2513 or else (Is_Child_Unit (Scop) and then Is_Visible_Child_Unit (Scop))
2515 Activate_Elaborate_All_Desirable (Call, Scop);
2516 Set_Suppress_Elaboration_Warnings (Scop, True);
2520 -- If this is not an initialization call or a call using object notation
2521 -- we know that the unit of the called entity is in the context, and
2522 -- we can set the flag as well. The unit need not be visible if the call
2523 -- occurs within an instantiation.
2525 if Is_Init_Proc (Subp)
2527 or else Nkind (Original_Node (Call)) = N_Selected_Component
2529 null; -- detailed processing follows.
2532 Activate_Elaborate_All_Desirable (Call, Scop);
2533 Set_Suppress_Elaboration_Warnings (Scop, True);
2537 -- If the unit is not in the context, there must be an intermediate unit
2538 -- that is, on which we need to place to elaboration flag. This happens
2539 -- with init proc calls.
2541 if Is_Init_Proc (Subp)
2544 -- The initialization call is on an object whose type is not declared
2545 -- in the same scope as the subprogram. The type of the object must
2546 -- be a subtype of the type of operation. This object is the first
2547 -- actual in the call.
2550 Typ : constant Entity_Id :=
2551 Etype (First (Parameter_Associations (Call)));
2553 Elab_Unit := Scope (Typ);
2554 while (Present (Elab_Unit))
2555 and then not Is_Compilation_Unit (Elab_Unit)
2557 Elab_Unit := Scope (Elab_Unit);
2561 -- If original node uses selected component notation, the prefix is
2562 -- visible and determines the scope that must be elaborated. After
2563 -- rewriting, the prefix is the first actual in the call.
2565 elsif Nkind (Original_Node (Call)) = N_Selected_Component then
2566 Elab_Unit := Scope (Etype (First (Parameter_Associations (Call))));
2568 -- Not one of special cases above
2571 -- Using previously computed scope. If the elaboration check is
2572 -- done after analysis, the scope is not visible any longer, but
2573 -- must still be in the context.
2578 Activate_Elaborate_All_Desirable (Call, Elab_Unit);
2579 Set_Suppress_Elaboration_Warnings (Elab_Unit, True);
2580 end Set_Elaboration_Constraint;
2582 ----------------------
2583 -- Has_Generic_Body --
2584 ----------------------
2586 function Has_Generic_Body (N : Node_Id) return Boolean is
2587 Ent : constant Entity_Id := Get_Generic_Entity (N);
2588 Decl : constant Node_Id := Unit_Declaration_Node (Ent);
2591 function Find_Body_In (E : Entity_Id; N : Node_Id) return Node_Id;
2592 -- Determine if the list of nodes headed by N and linked by Next
2593 -- contains a package body for the package spec entity E, and if so
2594 -- return the package body. If not, then returns Empty.
2596 function Load_Package_Body (Nam : Unit_Name_Type) return Node_Id;
2597 -- This procedure is called load the unit whose name is given by Nam.
2598 -- This unit is being loaded to see whether it contains an optional
2599 -- generic body. The returned value is the loaded unit, which is always
2600 -- a package body (only package bodies can contain other entities in the
2601 -- sense in which Has_Generic_Body is interested). We only attempt to
2602 -- load bodies if we are generating code. If we are in semantics check
2603 -- only mode, then it would be wrong to load bodies that are not
2604 -- required from a semantic point of view, so in this case we return
2605 -- Empty. The result is that the caller may incorrectly decide that a
2606 -- generic spec does not have a body when in fact it does, but the only
2607 -- harm in this is that some warnings on elaboration problems may be
2608 -- lost in semantic checks only mode, which is not big loss. We also
2609 -- return Empty if we go for a body and it is not there.
2611 function Locate_Corresponding_Body (PE : Entity_Id) return Node_Id;
2612 -- PE is the entity for a package spec. This function locates the
2613 -- corresponding package body, returning Empty if none is found. The
2614 -- package body returned is fully parsed but may not yet be analyzed,
2615 -- so only syntactic fields should be referenced.
2621 function Find_Body_In (E : Entity_Id; N : Node_Id) return Node_Id is
2626 while Present (Nod) loop
2628 -- If we found the package body we are looking for, return it
2630 if Nkind (Nod) = N_Package_Body
2631 and then Chars (Defining_Unit_Name (Nod)) = Chars (E)
2635 -- If we found the stub for the body, go after the subunit,
2636 -- loading it if necessary.
2638 elsif Nkind (Nod) = N_Package_Body_Stub
2639 and then Chars (Defining_Identifier (Nod)) = Chars (E)
2641 if Present (Library_Unit (Nod)) then
2642 return Unit (Library_Unit (Nod));
2645 return Load_Package_Body (Get_Unit_Name (Nod));
2648 -- If neither package body nor stub, keep looking on chain
2658 -----------------------
2659 -- Load_Package_Body --
2660 -----------------------
2662 function Load_Package_Body (Nam : Unit_Name_Type) return Node_Id is
2663 U : Unit_Number_Type;
2666 if Operating_Mode /= Generate_Code then
2679 return Unit (Cunit (U));
2682 end Load_Package_Body;
2684 -------------------------------
2685 -- Locate_Corresponding_Body --
2686 -------------------------------
2688 function Locate_Corresponding_Body (PE : Entity_Id) return Node_Id is
2689 Spec : constant Node_Id := Declaration_Node (PE);
2690 Decl : constant Node_Id := Parent (Spec);
2691 Scop : constant Entity_Id := Scope (PE);
2695 if Is_Library_Level_Entity (PE) then
2697 -- If package is a library unit that requires a body, we have no
2698 -- choice but to go after that body because it might contain an
2699 -- optional body for the original generic package.
2701 if Unit_Requires_Body (PE) then
2703 -- Load the body. Note that we are a little careful here to use
2704 -- Spec to get the unit number, rather than PE or Decl, since
2705 -- in the case where the package is itself a library level
2706 -- instantiation, Spec will properly reference the generic
2707 -- template, which is what we really want.
2711 (Get_Body_Name (Unit_Name (Get_Source_Unit (Spec))));
2713 -- But if the package is a library unit that does NOT require
2714 -- a body, then no body is permitted, so we are sure that there
2715 -- is no body for the original generic package.
2721 -- Otherwise look and see if we are embedded in a further package
2723 elsif Is_Package_Or_Generic_Package (Scop) then
2725 -- If so, get the body of the enclosing package, and look in
2726 -- its package body for the package body we are looking for.
2728 PBody := Locate_Corresponding_Body (Scop);
2733 return Find_Body_In (PE, First (Declarations (PBody)));
2736 -- If we are not embedded in a further package, then the body
2737 -- must be in the same declarative part as we are.
2740 return Find_Body_In (PE, Next (Decl));
2742 end Locate_Corresponding_Body;
2744 -- Start of processing for Has_Generic_Body
2747 if Present (Corresponding_Body (Decl)) then
2750 elsif Unit_Requires_Body (Ent) then
2753 -- Compilation units cannot have optional bodies
2755 elsif Is_Compilation_Unit (Ent) then
2758 -- Otherwise look at what scope we are in
2761 Scop := Scope (Ent);
2763 -- Case of entity is in other than a package spec, in this case
2764 -- the body, if present, must be in the same declarative part.
2766 if not Is_Package_Or_Generic_Package (Scop) then
2771 -- Declaration node may get us a spec, so if so, go to
2772 -- the parent declaration.
2774 P := Declaration_Node (Ent);
2775 while not Is_List_Member (P) loop
2779 return Present (Find_Body_In (Ent, Next (P)));
2782 -- If the entity is in a package spec, then we have to locate
2783 -- the corresponding package body, and look there.
2787 PBody : constant Node_Id := Locate_Corresponding_Body (Scop);
2795 (Find_Body_In (Ent, (First (Declarations (PBody)))));
2800 end Has_Generic_Body;
2802 -----------------------
2803 -- Insert_Elab_Check --
2804 -----------------------
2806 procedure Insert_Elab_Check (N : Node_Id; C : Node_Id := Empty) is
2808 Loc : constant Source_Ptr := Sloc (N);
2811 -- If expansion is disabled, do not generate any checks. Also
2812 -- skip checks if any subunits are missing because in either
2813 -- case we lack the full information that we need, and no object
2814 -- file will be created in any case.
2816 if not Expander_Active or else Subunits_Missing then
2820 -- If we have a generic instantiation, where Instance_Spec is set,
2821 -- then this field points to a generic instance spec that has
2822 -- been inserted before the instantiation node itself, so that
2823 -- is where we want to insert a check.
2825 if Nkind (N) in N_Generic_Instantiation
2826 and then Present (Instance_Spec (N))
2828 Nod := Instance_Spec (N);
2833 -- If we are inserting at the top level, insert in Aux_Decls
2835 if Nkind (Parent (Nod)) = N_Compilation_Unit then
2837 ADN : constant Node_Id := Aux_Decls_Node (Parent (Nod));
2843 Make_Raise_Program_Error (Loc,
2844 Reason => PE_Access_Before_Elaboration);
2847 Make_Raise_Program_Error (Loc,
2848 Condition => Make_Op_Not (Loc, C),
2849 Reason => PE_Access_Before_Elaboration);
2852 if No (Declarations (ADN)) then
2853 Set_Declarations (ADN, New_List (R));
2855 Append_To (Declarations (ADN), R);
2861 -- Otherwise just insert before the node in question. However, if
2862 -- the context of the call has already been analyzed, an insertion
2863 -- will not work if it depends on subsequent expansion (e.g. a call in
2864 -- a branch of a short-circuit). In that case we replace the call with
2865 -- a conditional expression, or with a Raise if it is unconditional.
2866 -- Unfortunately this does not work if the call has a dynamic size,
2867 -- because gigi regards it as a dynamic-sized temporary. If such a call
2868 -- appears in a short-circuit expression, the elaboration check will be
2869 -- missed (rare enough ???). Otherwise, the code below inserts the check
2870 -- at the appropriate place before the call. Same applies in the even
2871 -- rarer case the return type has a known size but is unconstrained.
2874 if Nkind (N) = N_Function_Call
2875 and then Analyzed (Parent (N))
2876 and then Size_Known_At_Compile_Time (Etype (N))
2878 (not Has_Discriminants (Etype (N))
2879 or else Is_Constrained (Etype (N)))
2883 Typ : constant Entity_Id := Etype (N);
2884 Chk : constant Boolean := Do_Range_Check (N);
2886 R : constant Node_Id :=
2887 Make_Raise_Program_Error (Loc,
2888 Reason => PE_Access_Before_Elaboration);
2899 Reloc_N := Relocate_Node (N);
2900 Save_Interps (N, Reloc_N);
2902 Make_Conditional_Expression (Loc,
2903 Expressions => New_List (C, Reloc_N, R)));
2906 Analyze_And_Resolve (N, Typ);
2908 -- If the original call requires a range check, so does the
2909 -- conditional expression.
2912 Enable_Range_Check (N);
2914 Set_Do_Range_Check (N, False);
2921 Make_Raise_Program_Error (Loc,
2922 Reason => PE_Access_Before_Elaboration));
2925 Make_Raise_Program_Error (Loc,
2929 Reason => PE_Access_Before_Elaboration));
2933 end Insert_Elab_Check;
2935 -------------------------------
2936 -- Is_Finalization_Procedure --
2937 -------------------------------
2939 function Is_Finalization_Procedure (Id : Entity_Id) return Boolean is
2941 -- Check whether Id is a procedure with at least one parameter
2943 if Ekind (Id) = E_Procedure
2944 and then Present (First_Formal (Id))
2947 Typ : constant Entity_Id := Etype (First_Formal (Id));
2948 Deep_Fin : Entity_Id := Empty;
2949 Fin : Entity_Id := Empty;
2952 -- If the type of the first formal does not require finalization
2953 -- actions, then this is definitely not [Deep_]Finalize.
2955 if not Needs_Finalization (Typ) then
2959 -- At this point we have the following scenario:
2961 -- procedure Name (Param1 : [in] [out] Ctrl[; Param2 : ...]);
2963 -- Recover the two possible versions of [Deep_]Finalize using the
2964 -- type of the first parameter and compare with the input.
2966 Deep_Fin := TSS (Typ, TSS_Deep_Finalize);
2968 if Is_Controlled (Typ) then
2969 Fin := Find_Prim_Op (Typ, Name_Finalize);
2973 (Present (Deep_Fin) and then Id = Deep_Fin)
2975 (Present (Fin) and then Id = Fin);
2980 end Is_Finalization_Procedure;
2986 procedure Output_Calls (N : Node_Id) is
2989 function Is_Printable_Error_Name (Nm : Name_Id) return Boolean;
2990 -- An internal function, used to determine if a name, Nm, is either
2991 -- a non-internal name, or is an internal name that is printable
2992 -- by the error message circuits (i.e. it has a single upper
2993 -- case letter at the end).
2995 function Is_Printable_Error_Name (Nm : Name_Id) return Boolean is
2997 if not Is_Internal_Name (Nm) then
3000 elsif Name_Len = 1 then
3004 Name_Len := Name_Len - 1;
3005 return not Is_Internal_Name;
3007 end Is_Printable_Error_Name;
3009 -- Start of processing for Output_Calls
3012 for J in reverse 1 .. Elab_Call.Last loop
3013 Error_Msg_Sloc := Elab_Call.Table (J).Cloc;
3015 Ent := Elab_Call.Table (J).Ent;
3017 if Is_Generic_Unit (Ent) then
3018 Error_Msg_NE ("\?& instantiated #", N, Ent);
3020 elsif Is_Init_Proc (Ent) then
3021 Error_Msg_N ("\?initialization procedure called #", N);
3023 elsif Is_Printable_Error_Name (Chars (Ent)) then
3024 Error_Msg_NE ("\?& called #", N, Ent);
3027 Error_Msg_N ("\? called #", N);
3032 ----------------------------
3033 -- Same_Elaboration_Scope --
3034 ----------------------------
3036 function Same_Elaboration_Scope (Scop1, Scop2 : Entity_Id) return Boolean is
3041 -- Find elaboration scope for Scop1
3042 -- This is either a subprogram or a compilation unit.
3045 while S1 /= Standard_Standard
3046 and then not Is_Compilation_Unit (S1)
3047 and then (Ekind (S1) = E_Package
3049 Ekind (S1) = E_Protected_Type
3051 Ekind (S1) = E_Block)
3056 -- Find elaboration scope for Scop2
3059 while S2 /= Standard_Standard
3060 and then not Is_Compilation_Unit (S2)
3061 and then (Ekind (S2) = E_Package
3063 Ekind (S2) = E_Protected_Type
3065 Ekind (S2) = E_Block)
3071 end Same_Elaboration_Scope;
3077 procedure Set_C_Scope is
3079 while not Is_Compilation_Unit (C_Scope) loop
3080 C_Scope := Scope (C_Scope);
3088 function Spec_Entity (E : Entity_Id) return Entity_Id is
3092 -- Check for case of body entity
3093 -- Why is the check for E_Void needed???
3095 if Ekind_In (E, E_Void, E_Subprogram_Body, E_Package_Body) then
3099 Decl := Parent (Decl);
3100 exit when Nkind (Decl) in N_Proper_Body;
3103 return Corresponding_Spec (Decl);
3114 procedure Supply_Bodies (N : Node_Id) is
3116 if Nkind (N) = N_Subprogram_Declaration then
3118 Ent : constant Entity_Id := Defining_Unit_Name (Specification (N));
3121 -- Internal subprograms will already have a generated body, so
3122 -- there is no need to provide a stub for them.
3124 if No (Corresponding_Body (N)) then
3126 Loc : constant Source_Ptr := Sloc (N);
3128 Formals : constant List_Id := Copy_Parameter_List (Ent);
3129 Nam : constant Entity_Id :=
3130 Make_Defining_Identifier (Loc, Chars (Ent));
3132 Stats : constant List_Id :=
3134 (Make_Raise_Program_Error (Loc,
3135 Reason => PE_Access_Before_Elaboration));
3138 if Ekind (Ent) = E_Function then
3140 Make_Function_Specification (Loc,
3141 Defining_Unit_Name => Nam,
3142 Parameter_Specifications => Formals,
3143 Result_Definition =>
3145 (Result_Definition (Specification (N))));
3147 -- We cannot reliably make a return statement for this
3148 -- body, but none is needed because the call raises
3151 Set_Return_Present (Ent);
3155 Make_Procedure_Specification (Loc,
3156 Defining_Unit_Name => Nam,
3157 Parameter_Specifications => Formals);
3160 B := Make_Subprogram_Body (Loc,
3161 Specification => Spec,
3162 Declarations => New_List,
3163 Handled_Statement_Sequence =>
3164 Make_Handled_Sequence_Of_Statements (Loc, Stats));
3165 Insert_After (N, B);
3171 elsif Nkind (N) = N_Package_Declaration then
3173 Spec : constant Node_Id := Specification (N);
3175 Push_Scope (Defining_Unit_Name (Spec));
3176 Supply_Bodies (Visible_Declarations (Spec));
3177 Supply_Bodies (Private_Declarations (Spec));
3183 procedure Supply_Bodies (L : List_Id) is
3188 while Present (Elmt) loop
3189 Supply_Bodies (Elmt);
3199 function Within (E1, E2 : Entity_Id) return Boolean is
3206 elsif Scop = Standard_Standard then
3209 Scop := Scope (Scop);
3214 --------------------------
3215 -- Within_Elaborate_All --
3216 --------------------------
3218 function Within_Elaborate_All (E : Entity_Id) return Boolean is
3221 Elab_Id : Entity_Id;
3225 Item := First (Context_Items (Cunit (Current_Sem_Unit)));
3226 while Present (Item) loop
3227 if Nkind (Item) = N_Pragma
3228 and then Pragma_Name (Item) = Name_Elaborate_All
3230 -- Return if some previous error on the pragma itself
3232 if Error_Posted (Item) then
3238 (Expression (First (Pragma_Argument_Associations (Item))));
3240 Par := Parent (Unit_Declaration_Node (Elab_Id));
3242 Item2 := First (Context_Items (Par));
3243 while Present (Item2) loop
3244 if Nkind (Item2) = N_With_Clause
3245 and then Entity (Name (Item2)) = E
3258 end Within_Elaborate_All;