1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1997-2012, 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_Res; use Sem_Res;
51 with Sem_Type; use Sem_Type;
52 with Sem_Util; use Sem_Util;
53 with Sinfo; use Sinfo;
54 with Sinput; use Sinput;
55 with Snames; use Snames;
56 with Stand; use Stand;
58 with Tbuild; use Tbuild;
59 with Uintp; use Uintp;
60 with Uname; use Uname;
62 package body Sem_Elab is
64 -- The following table records the recursive call chain for output in the
65 -- Output routine. Each entry records the call node and the entity of the
66 -- called routine. The number of entries in the table (i.e. the value of
67 -- Elab_Call.Last) indicates the current depth of recursion and is used to
68 -- identify the outer level.
70 type Elab_Call_Entry is record
75 package Elab_Call is new Table.Table (
76 Table_Component_Type => Elab_Call_Entry,
77 Table_Index_Type => Int,
80 Table_Increment => 100,
81 Table_Name => "Elab_Call");
83 -- This table is initialized at the start of each outer level call. It
84 -- holds the entities for all subprograms that have been examined for this
85 -- particular outer level call, and is used to prevent both infinite
86 -- recursion, and useless reanalysis of bodies already seen
88 package Elab_Visited is new Table.Table (
89 Table_Component_Type => Entity_Id,
90 Table_Index_Type => Int,
93 Table_Increment => 100,
94 Table_Name => "Elab_Visited");
96 -- This table stores calls to Check_Internal_Call that are delayed
97 -- until all generics are instantiated, and in particular that all
98 -- generic bodies have been inserted. We need to delay, because we
99 -- need to be able to look through the inserted bodies.
101 type Delay_Element is record
103 -- The parameter N from the call to Check_Internal_Call. Note that
104 -- this node may get rewritten over the delay period by expansion
105 -- in the call case (but not in the instantiation case).
108 -- The parameter E from the call to Check_Internal_Call
110 Orig_Ent : Entity_Id;
111 -- The parameter Orig_Ent from the call to Check_Internal_Call
114 -- The current scope of the call. This is restored when we complete
115 -- the delayed call, so that we do this in the right scope.
117 From_Elab_Code : Boolean;
118 -- Save indication of whether this call is from elaboration code
120 Outer_Scope : Entity_Id;
121 -- Save scope of outer level call
124 package Delay_Check is new Table.Table (
125 Table_Component_Type => Delay_Element,
126 Table_Index_Type => Int,
127 Table_Low_Bound => 1,
128 Table_Initial => 1000,
129 Table_Increment => 100,
130 Table_Name => "Delay_Check");
133 -- Top level scope of current scope. Compute this only once at the outer
134 -- level, i.e. for a call to Check_Elab_Call from outside this unit.
136 Outer_Level_Sloc : Source_Ptr;
137 -- Save Sloc value for outer level call node for comparisons of source
138 -- locations. A body is too late if it appears after the *outer* level
139 -- call, not the particular call that is being analyzed.
141 From_Elab_Code : Boolean;
142 -- This flag shows whether the outer level call currently being examined
143 -- is or is not in elaboration code. We are only interested in calls to
144 -- routines in other units if this flag is True.
146 In_Task_Activation : Boolean := False;
147 -- This flag indicates whether we are performing elaboration checks on
148 -- task procedures, at the point of activation. If true, we do not trace
149 -- internal calls in these procedures, because all local bodies are known
152 Delaying_Elab_Checks : Boolean := True;
153 -- This is set True till the compilation is complete, including the
154 -- insertion of all instance bodies. Then when Check_Elab_Calls is called,
155 -- the delay table is used to make the delayed calls and this flag is reset
156 -- to False, so that the calls are processed.
158 -----------------------
159 -- Local Subprograms --
160 -----------------------
162 -- Note: Outer_Scope in all following specs represents the scope of
163 -- interest of the outer level call. If it is set to Standard_Standard,
164 -- then it means the outer level call was at elaboration level, and that
165 -- thus all calls are of interest. If it was set to some other scope,
166 -- then the original call was an inner call, and we are not interested
167 -- in calls that go outside this scope.
169 procedure Activate_Elaborate_All_Desirable (N : Node_Id; U : Entity_Id);
170 -- Analysis of construct N shows that we should set Elaborate_All_Desirable
171 -- for the WITH clause for unit U (which will always be present). A special
172 -- case is when N is a function or procedure instantiation, in which case
173 -- it is sufficient to set Elaborate_Desirable, since in this case there is
174 -- no possibility of transitive elaboration issues.
176 procedure Check_A_Call
179 Outer_Scope : Entity_Id;
180 Inter_Unit_Only : Boolean;
181 Generate_Warnings : Boolean := True;
182 In_Init_Proc : Boolean := False);
183 -- This is the internal recursive routine that is called to check for
184 -- possible elaboration error. The argument N is a subprogram call or
185 -- generic instantiation, or 'Access attribute reference to be checked, and
186 -- E is the entity of the called subprogram, or instantiated generic unit,
187 -- or subprogram referenced by 'Access.
189 -- The flag Outer_Scope is the outer level scope for the original call.
190 -- Inter_Unit_Only is set if the call is only to be checked in the
191 -- case where it is to another unit (and skipped if within a unit).
192 -- Generate_Warnings is set to False to suppress warning messages about
193 -- missing pragma Elaborate_All's. These messages are not wanted for
194 -- inner calls in the dynamic model. Note that an instance of the Access
195 -- attribute applied to a subprogram also generates a call to this
196 -- procedure (since the referenced subprogram may be called later
197 -- indirectly). Flag In_Init_Proc should be set whenever the current
198 -- context is a type init proc.
200 procedure Check_Bad_Instantiation (N : Node_Id);
201 -- N is a node for an instantiation (if called with any other node kind,
202 -- Check_Bad_Instantiation ignores the call). This subprogram checks for
203 -- the special case of a generic instantiation of a generic spec in the
204 -- same declarative part as the instantiation where a body is present and
205 -- has not yet been seen. This is an obvious error, but needs to be checked
206 -- specially at the time of the instantiation, since it is a case where we
207 -- cannot insert the body anywhere. If this case is detected, warnings are
208 -- generated, and a raise of Program_Error is inserted. In addition any
209 -- subprograms in the generic spec are stubbed, and the Bad_Instantiation
210 -- flag is set on the instantiation node. The caller in Sem_Ch12 uses this
211 -- flag as an indication that no attempt should be made to insert an
214 procedure Check_Internal_Call
217 Outer_Scope : Entity_Id;
218 Orig_Ent : Entity_Id);
219 -- N is a function call or procedure statement call node and E is the
220 -- entity of the called function, which is within the current compilation
221 -- unit (where subunits count as part of the parent). This call checks if
222 -- this call, or any call within any accessed body could cause an ABE, and
223 -- if so, outputs a warning. Orig_Ent differs from E only in the case of
224 -- renamings, and points to the original name of the entity. This is used
225 -- for error messages. Outer_Scope is the outer level scope for the
228 procedure Check_Internal_Call_Continue
231 Outer_Scope : Entity_Id;
232 Orig_Ent : Entity_Id);
233 -- The processing for Check_Internal_Call is divided up into two phases,
234 -- and this represents the second phase. The second phase is delayed if
235 -- Delaying_Elab_Calls is set to True. In this delayed case, the first
236 -- phase makes an entry in the Delay_Check table, which is processed when
237 -- Check_Elab_Calls is called. N, E and Orig_Ent are as for the call to
238 -- Check_Internal_Call. Outer_Scope is the outer level scope for the
241 function Has_Generic_Body (N : Node_Id) return Boolean;
242 -- N is a generic package instantiation node, and this routine determines
243 -- if this package spec does in fact have a generic body. If so, then
244 -- True is returned, otherwise False. Note that this is not at all the
245 -- same as checking if the unit requires a body, since it deals with
246 -- the case of optional bodies accurately (i.e. if a body is optional,
247 -- then it looks to see if a body is actually present). Note: this
248 -- function can only do a fully correct job if in generating code mode
249 -- where all bodies have to be present. If we are operating in semantics
250 -- check only mode, then in some cases of optional bodies, a result of
251 -- False may incorrectly be given. In practice this simply means that
252 -- some cases of warnings for incorrect order of elaboration will only
253 -- be given when generating code, which is not a big problem (and is
254 -- inevitable, given the optional body semantics of Ada).
256 procedure Insert_Elab_Check (N : Node_Id; C : Node_Id := Empty);
257 -- Given code for an elaboration check (or unconditional raise if the check
258 -- is not needed), inserts the code in the appropriate place. N is the call
259 -- or instantiation node for which the check code is required. C is the
260 -- test whose failure triggers the raise.
262 function Is_Finalization_Procedure (Id : Entity_Id) return Boolean;
263 -- Determine whether entity Id denotes a [Deep_]Finalize procedure
265 procedure Output_Calls (N : Node_Id);
266 -- Outputs chain of calls stored in the Elab_Call table. The caller has
267 -- already generated the main warning message, so the warnings generated
268 -- are all continuation messages. The argument is the call node at which
269 -- the messages are to be placed.
271 function Same_Elaboration_Scope (Scop1, Scop2 : Entity_Id) return Boolean;
272 -- Given two scopes, determine whether they are the same scope from an
273 -- elaboration point of view, i.e. packages and blocks are ignored.
275 procedure Set_C_Scope;
276 -- On entry C_Scope is set to some scope. On return, C_Scope is reset
277 -- to be the enclosing compilation unit of this scope.
279 function Get_Referenced_Ent (N : Node_Id) return Entity_Id;
280 -- N is either a function or procedure call or an access attribute that
281 -- references a subprogram. This call retrieves the relevant entity. If
282 -- this is a call to a protected subprogram, the entity is a selected
283 -- component. The callable entity may be absent, in which case Empty is
284 -- returned. This happens with non-analyzed calls in nested generics.
286 procedure Set_Elaboration_Constraint
290 -- The current unit U may depend semantically on some unit P which is not
291 -- in the current context. If there is an elaboration call that reaches P,
292 -- we need to indicate that P requires an Elaborate_All, but this is not
293 -- effective in U's ali file, if there is no with_clause for P. In this
294 -- case we add the Elaborate_All on the unit Q that directly or indirectly
295 -- makes P available. This can happen in two cases:
297 -- a) Q declares a subtype of a type declared in P, and the call is an
298 -- initialization call for an object of that subtype.
300 -- b) Q declares an object of some tagged type whose root type is
301 -- declared in P, and the initialization call uses object notation on
302 -- that object to reach a primitive operation or a classwide operation
305 -- If P appears in the context of U, the current processing is correct.
306 -- Otherwise we must identify these two cases to retrieve Q and place the
307 -- Elaborate_All_Desirable on it.
309 function Spec_Entity (E : Entity_Id) return Entity_Id;
310 -- Given a compilation unit entity, if it is a spec entity, it is returned
311 -- unchanged. If it is a body entity, then the spec for the corresponding
314 procedure Supply_Bodies (N : Node_Id);
315 -- Given a node, N, that is either a subprogram declaration or a package
316 -- declaration, this procedure supplies dummy bodies for the subprogram
317 -- or for all subprograms in the package. If the given node is not one
318 -- of these two possibilities, then Supply_Bodies does nothing. The
319 -- dummy body contains a single Raise statement.
321 procedure Supply_Bodies (L : List_Id);
322 -- Calls Supply_Bodies for all elements of the given list L
324 function Within (E1, E2 : Entity_Id) return Boolean;
325 -- Given two scopes E1 and E2, returns True if E1 is equal to E2, or is one
326 -- of its contained scopes, False otherwise.
328 function Within_Elaborate_All
329 (Unit : Unit_Number_Type;
330 E : Entity_Id) return Boolean;
331 -- Return True if we are within the scope of an Elaborate_All for E, or if
332 -- we are within the scope of an Elaborate_All for some other unit U, and U
333 -- with's E. This prevents spurious warnings when the called entity is
334 -- renamed within U, or in case of generic instances.
336 --------------------------------------
337 -- Activate_Elaborate_All_Desirable --
338 --------------------------------------
340 procedure Activate_Elaborate_All_Desirable (N : Node_Id; U : Entity_Id) is
341 UN : constant Unit_Number_Type := Get_Code_Unit (N);
342 CU : constant Node_Id := Cunit (UN);
343 UE : constant Entity_Id := Cunit_Entity (UN);
344 Unm : constant Unit_Name_Type := Unit_Name (UN);
345 CI : constant List_Id := Context_Items (CU);
349 procedure Add_To_Context_And_Mark (Itm : Node_Id);
350 -- This procedure is called when the elaborate indication must be
351 -- applied to a unit not in the context of the referencing unit. The
352 -- unit gets added to the context as an implicit with.
354 function In_Withs_Of (UEs : Entity_Id) return Boolean;
355 -- UEs is the spec entity of a unit. If the unit to be marked is
356 -- in the context item list of this unit spec, then the call returns
357 -- True and Itm is left set to point to the relevant N_With_Clause node.
359 procedure Set_Elab_Flag (Itm : Node_Id);
360 -- Sets Elaborate_[All_]Desirable as appropriate on Itm
362 -----------------------------
363 -- Add_To_Context_And_Mark --
364 -----------------------------
366 procedure Add_To_Context_And_Mark (Itm : Node_Id) is
367 CW : constant Node_Id :=
368 Make_With_Clause (Sloc (Itm),
372 Set_Library_Unit (CW, Library_Unit (Itm));
373 Set_Implicit_With (CW, True);
375 -- Set elaborate all desirable on copy and then append the copy to
376 -- the list of body with's and we are done.
380 end Add_To_Context_And_Mark;
386 function In_Withs_Of (UEs : Entity_Id) return Boolean is
387 UNs : constant Unit_Number_Type := Get_Source_Unit (UEs);
388 CUs : constant Node_Id := Cunit (UNs);
389 CIs : constant List_Id := Context_Items (CUs);
393 while Present (Itm) loop
394 if Nkind (Itm) = N_With_Clause then
396 Cunit_Entity (Get_Cunit_Unit_Number (Library_Unit (Itm)));
413 procedure Set_Elab_Flag (Itm : Node_Id) is
415 if Nkind (N) in N_Subprogram_Instantiation then
416 Set_Elaborate_Desirable (Itm);
418 Set_Elaborate_All_Desirable (Itm);
422 -- Start of processing for Activate_Elaborate_All_Desirable
425 -- Do not set binder indication if expansion is disabled, as when
426 -- compiling a generic unit.
428 if not Expander_Active then
433 while Present (Itm) loop
434 if Nkind (Itm) = N_With_Clause then
435 Ent := Cunit_Entity (Get_Cunit_Unit_Number (Library_Unit (Itm)));
437 -- If we find it, then mark elaborate all desirable and return
448 -- If we fall through then the with clause is not present in the
449 -- current unit. One legitimate possibility is that the with clause
450 -- is present in the spec when we are a body.
452 if Is_Body_Name (Unm)
453 and then In_Withs_Of (Spec_Entity (UE))
455 Add_To_Context_And_Mark (Itm);
459 -- Similarly, we may be in the spec or body of a child unit, where
460 -- the unit in question is with'ed by some ancestor of the child unit.
462 if Is_Child_Name (Unm) then
470 exit when Pkg = Standard_Standard;
472 if In_Withs_Of (Pkg) then
473 Add_To_Context_And_Mark (Itm);
480 -- Here if we do not find with clause on spec or body. We just ignore
481 -- this case, it means that the elaboration involves some other unit
482 -- than the unit being compiled, and will be caught elsewhere.
485 end Activate_Elaborate_All_Desirable;
491 procedure Check_A_Call
494 Outer_Scope : Entity_Id;
495 Inter_Unit_Only : Boolean;
496 Generate_Warnings : Boolean := True;
497 In_Init_Proc : Boolean := False)
499 Loc : constant Source_Ptr := Sloc (N);
504 -- Top level scope of entity for called subprogram. This value includes
505 -- following renamings and derivations, so this scope can be in a
506 -- non-visible unit. This is the scope that is to be investigated to
507 -- see whether an elaboration check is required.
510 -- Top level scope of directly called entity for subprogram. This
511 -- differs from E_Scope in the case where renamings or derivations
512 -- are involved, since it does not follow these links. W_Scope is
513 -- generally in a visible unit, and it is this scope that may require
514 -- an Elaborate_All. However, there are some cases (initialization
515 -- calls and calls involving object notation) where W_Scope might not
516 -- be in the context of the current unit, and there is an intermediate
517 -- package that is, in which case the Elaborate_All has to be placed
518 -- on this intermediate package. These special cases are handled in
519 -- Set_Elaboration_Constraint.
521 Body_Acts_As_Spec : Boolean;
522 -- Set to true if call is to body acting as spec (no separate spec)
524 Inst_Case : constant Boolean := Nkind (N) in N_Generic_Instantiation;
525 -- Indicates if we have instantiation case
527 Access_Case : constant Boolean := Nkind (N) = N_Attribute_Reference;
528 -- Indicates if we have Access attribute case
530 Caller_Unit_Internal : Boolean;
531 Callee_Unit_Internal : Boolean;
533 Inst_Caller : Source_Ptr;
534 Inst_Callee : Source_Ptr;
536 Unit_Caller : Unit_Number_Type;
537 Unit_Callee : Unit_Number_Type;
539 Cunit_SC : Boolean := False;
540 -- Set to suppress dynamic elaboration checks where one of the
541 -- enclosing scopes has Elaboration_Checks_Suppressed set, or else
542 -- if a pragma Elaborate (_All) applies to that scope, in which case
543 -- warnings on the scope are also suppressed. For the internal case,
544 -- we ignore this flag.
547 -- If the call is known to be within a local Suppress Elaboration
548 -- pragma, nothing to check. This can happen in task bodies.
550 if Nkind (N) in N_Subprogram_Call
551 and then No_Elaboration_Check (N)
556 -- Go to parent for derived subprogram, or to original subprogram in the
557 -- case of a renaming (Alias covers both these cases).
561 if (Suppress_Elaboration_Warnings (Ent)
562 or else Elaboration_Checks_Suppressed (Ent))
563 and then (Inst_Case or else No (Alias (Ent)))
568 -- Nothing to do for imported entities
570 if Is_Imported (Ent) then
574 exit when Inst_Case or else No (Alias (Ent));
578 Decl := Unit_Declaration_Node (Ent);
580 if Nkind (Decl) = N_Subprogram_Body then
581 Body_Acts_As_Spec := True;
583 elsif Nkind (Decl) = N_Subprogram_Declaration
584 or else Nkind (Decl) = N_Subprogram_Body_Stub
587 Body_Acts_As_Spec := False;
589 -- If we have none of an instantiation, subprogram body or
590 -- subprogram declaration, then it is not a case that we want
591 -- to check. (One case is a call to a generic formal subprogram,
592 -- where we do not want the check in the template).
600 if Elaboration_Checks_Suppressed (E_Scope)
601 or else Suppress_Elaboration_Warnings (E_Scope)
606 -- Exit when we get to compilation unit, not counting subunits
608 exit when Is_Compilation_Unit (E_Scope)
609 and then (Is_Child_Unit (E_Scope)
610 or else Scope (E_Scope) = Standard_Standard);
612 -- If we did not find a compilation unit, other than standard,
613 -- then nothing to check (happens in some instantiation cases)
615 if E_Scope = Standard_Standard then
618 -- Otherwise move up a scope looking for compilation unit
621 E_Scope := Scope (E_Scope);
625 -- No checks needed for pure or preelaborated compilation units
627 if Is_Pure (E_Scope) or else Is_Preelaborated (E_Scope) then
631 -- If the generic entity is within a deeper instance than we are, then
632 -- either the instantiation to which we refer itself caused an ABE, in
633 -- which case that will be handled separately, or else we know that the
634 -- body we need appears as needed at the point of the instantiation.
635 -- However, this assumption is only valid if we are in static mode.
637 if not Dynamic_Elaboration_Checks
638 and then Instantiation_Depth (Sloc (Ent)) >
639 Instantiation_Depth (Sloc (N))
644 -- Do not give a warning for a package with no body
646 if Ekind (Ent) = E_Generic_Package
647 and then not Has_Generic_Body (N)
652 -- Case of entity is not in current unit (i.e. with'ed unit case)
654 if E_Scope /= C_Scope then
656 -- We are only interested in such calls if the outer call was from
657 -- elaboration code, or if we are in Dynamic_Elaboration_Checks mode.
659 if not From_Elab_Code and then not Dynamic_Elaboration_Checks then
663 -- Nothing to do if some scope said that no checks were required
669 -- Nothing to do for a generic instance, because in this case the
670 -- checking was at the point of instantiation of the generic However,
671 -- this shortcut is only applicable in static mode.
673 if Is_Generic_Instance (Ent) and not Dynamic_Elaboration_Checks then
677 -- Nothing to do if subprogram with no separate spec. However, a
678 -- call to Deep_Initialize may result in a call to a user-defined
679 -- Initialize procedure, which imposes a body dependency. This
680 -- happens only if the type is controlled and the Initialize
681 -- procedure is not inherited.
683 if Body_Acts_As_Spec then
684 if Is_TSS (Ent, TSS_Deep_Initialize) then
686 Typ : constant Entity_Id := Etype (First_Formal (Ent));
690 if not Is_Controlled (Typ) then
693 Init := Find_Prim_Op (Typ, Name_Initialize);
695 if Comes_From_Source (Init) then
708 -- Check cases of internal units
710 Callee_Unit_Internal :=
711 Is_Internal_File_Name
712 (Unit_File_Name (Get_Source_Unit (E_Scope)));
714 -- Do not give a warning if the with'ed unit is internal and this is
715 -- the generic instantiation case (this saves a lot of hassle dealing
716 -- with the Text_IO special child units)
718 if Callee_Unit_Internal and Inst_Case then
722 if C_Scope = Standard_Standard then
723 Caller_Unit_Internal := False;
725 Caller_Unit_Internal :=
726 Is_Internal_File_Name
727 (Unit_File_Name (Get_Source_Unit (C_Scope)));
730 -- Do not give a warning if the with'ed unit is internal and the
731 -- caller is not internal (since the binder always elaborates
732 -- internal units first).
734 if Callee_Unit_Internal and (not Caller_Unit_Internal) then
738 -- For now, if debug flag -gnatdE is not set, do no checking for
739 -- one internal unit withing another. This fixes the problem with
740 -- the sgi build and storage errors. To be resolved later ???
742 if (Callee_Unit_Internal and Caller_Unit_Internal)
743 and then not Debug_Flag_EE
748 if Is_TSS (E, TSS_Deep_Initialize) then
752 -- If the call is in an instance, and the called entity is not
753 -- defined in the same instance, then the elaboration issue focuses
754 -- around the unit containing the template, it is this unit which
755 -- requires an Elaborate_All.
757 -- However, if we are doing dynamic elaboration, we need to chase the
758 -- call in the usual manner.
760 -- We do not handle the case of calling a generic formal correctly in
761 -- the static case.???
763 Inst_Caller := Instantiation (Get_Source_File_Index (Sloc (N)));
764 Inst_Callee := Instantiation (Get_Source_File_Index (Sloc (Ent)));
766 if Inst_Caller = No_Location then
767 Unit_Caller := No_Unit;
769 Unit_Caller := Get_Source_Unit (N);
772 if Inst_Callee = No_Location then
773 Unit_Callee := No_Unit;
775 Unit_Callee := Get_Source_Unit (Ent);
778 if Unit_Caller /= No_Unit
779 and then Unit_Callee /= Unit_Caller
780 and then not Dynamic_Elaboration_Checks
782 E_Scope := Spec_Entity (Cunit_Entity (Unit_Caller));
784 -- If we don't get a spec entity, just ignore call. Not quite
785 -- clear why this check is necessary. ???
791 -- Otherwise step to enclosing compilation unit
793 while not Is_Compilation_Unit (E_Scope) loop
794 E_Scope := Scope (E_Scope);
797 -- For the case N is not an instance, or a call within instance, we
798 -- recompute E_Scope for the error message, since we do NOT want to
799 -- go to the unit which has the ultimate declaration in the case of
800 -- renaming and derivation and we also want to go to the generic unit
801 -- in the case of an instance, and no further.
804 -- Loop to carefully follow renamings and derivations one step
805 -- outside the current unit, but not further.
808 and then Present (Alias (Ent))
810 E_Scope := Alias (Ent);
816 while not Is_Compilation_Unit (E_Scope) loop
817 E_Scope := Scope (E_Scope);
820 -- If E_Scope is the same as C_Scope, it means that there
821 -- definitely was a local renaming or derivation, and we
822 -- are not yet out of the current unit.
824 exit when E_Scope /= C_Scope;
828 -- If no alias, there is a previous error
831 Check_Error_Detected;
837 if Within_Elaborate_All (Current_Sem_Unit, E_Scope) then
841 -- Find top level scope for called entity (not following renamings
842 -- or derivations). This is where the Elaborate_All will go if it
843 -- is needed. We start with the called entity, except in the case
844 -- of an initialization procedure outside the current package, where
845 -- the init proc is in the root package, and we start from the entity
846 -- of the name in the call.
849 Ent : constant Entity_Id := Get_Referenced_Ent (N);
851 if Is_Init_Proc (Ent)
852 and then not In_Same_Extended_Unit (N, Ent)
854 W_Scope := Scope (Ent);
860 -- Now loop through scopes to get to the enclosing compilation unit
862 while not Is_Compilation_Unit (W_Scope) loop
863 W_Scope := Scope (W_Scope);
866 -- Now check if an elaborate_all (or dynamic check) is needed
868 if not Suppress_Elaboration_Warnings (Ent)
869 and then not Elaboration_Checks_Suppressed (Ent)
870 and then not Suppress_Elaboration_Warnings (E_Scope)
871 and then not Elaboration_Checks_Suppressed (E_Scope)
872 and then Elab_Warnings
873 and then Generate_Warnings
875 Generate_Elab_Warnings : declare
876 procedure Elab_Warning
879 Ent : Node_Or_Entity_Id);
880 -- Generate a call to Error_Msg_NE with parameters Msg_D or
881 -- Msg_S (for dynamic or static elaboration model), N and Ent.
882 -- Msg_D is suppressed for the attribute reference case, since
883 -- we never raise Program_Error for an attribute reference.
889 procedure Elab_Warning
892 Ent : Node_Or_Entity_Id)
895 if Dynamic_Elaboration_Checks then
896 if not Access_Case then
897 Error_Msg_NE (Msg_D, N, Ent);
900 Error_Msg_NE (Msg_S, N, Ent);
904 -- Start of processing for Generate_Elab_Warnings
907 -- Instantiation case
911 ("instantiation of& may raise Program_Error?l?",
912 "info: instantiation of& during elaboration?l?", Ent);
914 -- Indirect call case, warning only in static elaboration
915 -- case, because the attribute reference itself cannot raise
918 elsif Access_Case then
920 ("", "info: access to& during elaboration?l?", Ent);
922 -- Subprogram call case
925 if Nkind (Name (N)) in N_Has_Entity
926 and then Is_Init_Proc (Entity (Name (N)))
927 and then Comes_From_Source (Ent)
930 ("implicit call to & may raise Program_Error?l?",
931 "info: implicit call to & during elaboration?l?",
936 ("call to & may raise Program_Error?l?",
937 "info: call to & during elaboration?l?",
942 Error_Msg_Qual_Level := Nat'Last;
944 if Nkind (N) in N_Subprogram_Instantiation then
946 ("\missing pragma Elaborate for&?l?",
947 "\info: implicit pragma Elaborate for& generated?l?",
952 ("\missing pragma Elaborate_All for&?l?",
953 "\info: implicit pragma Elaborate_All for & generated?l?",
956 end Generate_Elab_Warnings;
958 Error_Msg_Qual_Level := 0;
961 -- Set flag to prevent further warnings for same unit unless in
964 if not All_Errors_Mode and not Dynamic_Elaboration_Checks then
965 Set_Suppress_Elaboration_Warnings (W_Scope, True);
969 -- Check for runtime elaboration check required
971 if Dynamic_Elaboration_Checks then
972 if not Elaboration_Checks_Suppressed (Ent)
973 and then not Elaboration_Checks_Suppressed (W_Scope)
974 and then not Elaboration_Checks_Suppressed (E_Scope)
975 and then not Cunit_SC
977 -- Runtime elaboration check required. Generate check of the
978 -- elaboration Boolean for the unit containing the entity.
980 -- Note that for this case, we do check the real unit (the one
981 -- from following renamings, since that is the issue!)
983 -- Could this possibly miss a useless but required PE???
985 Insert_Elab_Check (N,
986 Make_Attribute_Reference (Loc,
987 Attribute_Name => Name_Elaborated,
989 New_Occurrence_Of (Spec_Entity (E_Scope), Loc)));
991 -- Prevent duplicate elaboration checks on the same call,
992 -- which can happen if the body enclosing the call appears
993 -- itself in a call whose elaboration check is delayed.
995 if Nkind (N) in N_Subprogram_Call then
996 Set_No_Elaboration_Check (N);
1000 -- Case of static elaboration model
1003 -- Do not do anything if elaboration checks suppressed. Note that
1004 -- we check Ent here, not E, since we want the real entity for the
1005 -- body to see if checks are suppressed for it, not the dummy
1006 -- entry for renamings or derivations.
1008 if Elaboration_Checks_Suppressed (Ent)
1009 or else Elaboration_Checks_Suppressed (E_Scope)
1010 or else Elaboration_Checks_Suppressed (W_Scope)
1014 -- Do not generate an Elaborate_All for finalization routines
1015 -- which perform partial clean up as part of initialization.
1017 elsif In_Init_Proc and then Is_Finalization_Procedure (Ent) then
1020 -- Here we need to generate an implicit elaborate all
1023 -- Generate elaborate_all warning unless suppressed
1025 if (Elab_Warnings and Generate_Warnings and not Inst_Case)
1026 and then not Suppress_Elaboration_Warnings (Ent)
1027 and then not Suppress_Elaboration_Warnings (E_Scope)
1028 and then not Suppress_Elaboration_Warnings (W_Scope)
1030 Error_Msg_Node_2 := W_Scope;
1032 ("call to& in elaboration code " &
1033 "requires pragma Elaborate_All on&?l?", N, E);
1036 -- Set indication for binder to generate Elaborate_All
1038 Set_Elaboration_Constraint (N, E, W_Scope);
1042 -- Case of entity is in same unit as call or instantiation
1044 elsif not Inter_Unit_Only then
1045 Check_Internal_Call (N, Ent, Outer_Scope, E);
1049 -----------------------------
1050 -- Check_Bad_Instantiation --
1051 -----------------------------
1053 procedure Check_Bad_Instantiation (N : Node_Id) is
1057 -- Nothing to do if we do not have an instantiation (happens in some
1058 -- error cases, and also in the formal package declaration case)
1060 if Nkind (N) not in N_Generic_Instantiation then
1063 -- Nothing to do if serious errors detected (avoid cascaded errors)
1065 elsif Serious_Errors_Detected /= 0 then
1068 -- Nothing to do if not in full analysis mode
1070 elsif not Full_Analysis then
1073 -- Nothing to do if inside a generic template
1075 elsif Inside_A_Generic then
1078 -- Nothing to do if a library level instantiation
1080 elsif Nkind (Parent (N)) = N_Compilation_Unit then
1083 -- Nothing to do if we are compiling a proper body for semantic
1084 -- purposes only. The generic body may be in another proper body.
1087 Nkind (Parent (Unit_Declaration_Node (Main_Unit_Entity))) = N_Subunit
1092 Ent := Get_Generic_Entity (N);
1094 -- The case we are interested in is when the generic spec is in the
1095 -- current declarative part
1097 if not Same_Elaboration_Scope (Current_Scope, Scope (Ent))
1098 or else not In_Same_Extended_Unit (N, Ent)
1103 -- If the generic entity is within a deeper instance than we are, then
1104 -- either the instantiation to which we refer itself caused an ABE, in
1105 -- which case that will be handled separately. Otherwise, we know that
1106 -- the body we need appears as needed at the point of the instantiation.
1107 -- If they are both at the same level but not within the same instance
1108 -- then the body of the generic will be in the earlier instance.
1111 D1 : constant Int := Instantiation_Depth (Sloc (Ent));
1112 D2 : constant Int := Instantiation_Depth (Sloc (N));
1119 and then Is_Generic_Instance (Scope (Ent))
1120 and then not In_Open_Scopes (Scope (Ent))
1126 -- Now we can proceed, if the entity being called has a completion,
1127 -- then we are definitely OK, since we have already seen the body.
1129 if Has_Completion (Ent) then
1133 -- If there is no body, then nothing to do
1135 if not Has_Generic_Body (N) then
1139 -- Here we definitely have a bad instantiation
1141 Error_Msg_NE ("??cannot instantiate& before body seen", N, Ent);
1143 if Present (Instance_Spec (N)) then
1144 Supply_Bodies (Instance_Spec (N));
1147 Error_Msg_N ("\??Program_Error will be raised at run time", N);
1148 Insert_Elab_Check (N);
1149 Set_ABE_Is_Certain (N);
1150 end Check_Bad_Instantiation;
1152 ---------------------
1153 -- Check_Elab_Call --
1154 ---------------------
1156 procedure Check_Elab_Call
1158 Outer_Scope : Entity_Id := Empty;
1159 In_Init_Proc : Boolean := False)
1165 -- If the call does not come from the main unit, there is nothing to
1166 -- check. Elaboration call from units in the context of the main unit
1167 -- will lead to semantic dependencies when those units are compiled.
1169 if not In_Extended_Main_Code_Unit (N) then
1173 -- For an entry call, check relevant restriction
1175 if Nkind (N) = N_Entry_Call_Statement
1176 and then not In_Subprogram_Or_Concurrent_Unit
1178 Check_Restriction (No_Entry_Calls_In_Elaboration_Code, N);
1180 -- Nothing to do if this is not a call or attribute reference (happens
1181 -- in some error conditions, and in some cases where rewriting occurs).
1183 elsif Nkind (N) not in N_Subprogram_Call
1184 and then Nkind (N) /= N_Attribute_Reference
1188 -- Nothing to do if this is a call already rewritten for elab checking
1190 elsif Nkind (Parent (N)) = N_If_Expression then
1193 -- Nothing to do if inside a generic template
1195 elsif Inside_A_Generic
1196 and then No (Enclosing_Generic_Body (N))
1201 -- Here we have a call at elaboration time which must be checked
1203 if Debug_Flag_LL then
1204 Write_Str (" Check_Elab_Call: ");
1206 if Nkind (N) = N_Attribute_Reference then
1207 if not Is_Entity_Name (Prefix (N)) then
1208 Write_Str ("<<not entity name>>");
1210 Write_Name (Chars (Entity (Prefix (N))));
1212 Write_Str ("'Access");
1214 elsif No (Name (N)) or else not Is_Entity_Name (Name (N)) then
1215 Write_Str ("<<not entity name>> ");
1218 Write_Name (Chars (Entity (Name (N))));
1221 Write_Str (" call at ");
1222 Write_Location (Sloc (N));
1226 -- Climb up the tree to make sure we are not inside default expression
1227 -- of a parameter specification or a record component, since in both
1228 -- these cases, we will be doing the actual call later, not now, and it
1229 -- is at the time of the actual call (statically speaking) that we must
1230 -- do our static check, not at the time of its initial analysis).
1232 -- However, we have to check calls within component definitions (e.g.
1233 -- a function call that determines an array component bound), so we
1234 -- terminate the loop in that case.
1237 while Present (P) loop
1238 if Nkind_In (P, N_Parameter_Specification,
1239 N_Component_Declaration)
1243 -- The call occurs within the constraint of a component,
1244 -- so it must be checked.
1246 elsif Nkind (P) = N_Component_Definition then
1254 -- Stuff that happens only at the outer level
1256 if No (Outer_Scope) then
1257 Elab_Visited.Set_Last (0);
1259 -- Nothing to do if current scope is Standard (this is a bit odd, but
1260 -- it happens in the case of generic instantiations).
1262 C_Scope := Current_Scope;
1264 if C_Scope = Standard_Standard then
1268 -- First case, we are in elaboration code
1270 From_Elab_Code := not In_Subprogram_Or_Concurrent_Unit;
1271 if From_Elab_Code then
1273 -- Complain if call that comes from source in preelaborated unit
1274 -- and we are not inside a subprogram (i.e. we are in elab code).
1276 if Comes_From_Source (N)
1277 and then In_Preelaborated_Unit
1278 and then not In_Inlined_Body
1279 and then Nkind (N) /= N_Attribute_Reference
1281 -- This is a warning in GNAT mode allowing such calls to be
1282 -- used in the predefined library with appropriate care.
1284 Error_Msg_Warn := GNAT_Mode;
1286 ("<non-static call not allowed in preelaborated unit", N);
1290 -- Second case, we are inside a subprogram or concurrent unit, which
1291 -- means we are not in elaboration code.
1294 -- In this case, the issue is whether we are inside the
1295 -- declarative part of the unit in which we live, or inside its
1296 -- statements. In the latter case, there is no issue of ABE calls
1297 -- at this level (a call from outside to the unit in which we live
1298 -- might cause an ABE, but that will be detected when we analyze
1299 -- that outer level call, as it recurses into the called unit).
1301 -- Climb up the tree, doing this test, and also testing for being
1302 -- inside a default expression, which, as discussed above, is not
1303 -- checked at this stage.
1312 -- If we find a parentless subtree, it seems safe to assume
1313 -- that we are not in a declarative part and that no
1314 -- checking is required.
1320 if Is_List_Member (P) then
1321 L := List_Containing (P);
1328 exit when Nkind (P) = N_Subunit;
1330 -- Filter out case of default expressions, where we do not
1331 -- do the check at this stage.
1333 if Nkind (P) = N_Parameter_Specification
1335 Nkind (P) = N_Component_Declaration
1340 -- A protected body has no elaboration code and contains
1341 -- only other bodies.
1343 if Nkind (P) = N_Protected_Body then
1346 elsif Nkind (P) = N_Subprogram_Body
1348 Nkind (P) = N_Task_Body
1350 Nkind (P) = N_Block_Statement
1352 Nkind (P) = N_Entry_Body
1354 if L = Declarations (P) then
1357 -- We are not in elaboration code, but we are doing
1358 -- dynamic elaboration checks, in this case, we still
1359 -- need to do the call, since the subprogram we are in
1360 -- could be called from another unit, also in dynamic
1361 -- elaboration check mode, at elaboration time.
1363 elsif Dynamic_Elaboration_Checks then
1365 -- We provide a debug flag to disable this check. That
1366 -- way we have an easy work around for regressions
1367 -- that are caused by this new check. This debug flag
1368 -- can be removed later.
1370 if Debug_Flag_DD then
1374 -- Do the check in this case
1378 elsif Nkind (P) = N_Task_Body then
1380 -- The check is deferred until Check_Task_Activation
1381 -- but we need to capture local suppress pragmas
1382 -- that may inhibit checks on this call.
1384 Ent := Get_Referenced_Ent (N);
1389 elsif Elaboration_Checks_Suppressed (Current_Scope)
1390 or else Elaboration_Checks_Suppressed (Ent)
1391 or else Elaboration_Checks_Suppressed (Scope (Ent))
1393 Set_No_Elaboration_Check (N);
1398 -- Static model, call is not in elaboration code, we
1399 -- never need to worry, because in the static model the
1400 -- top level caller always takes care of things.
1411 Ent := Get_Referenced_Ent (N);
1417 -- Nothing to do if this is a recursive call (i.e. a call to
1418 -- an entity that is already in the Elab_Call stack)
1420 for J in 1 .. Elab_Visited.Last loop
1421 if Ent = Elab_Visited.Table (J) then
1426 -- See if we need to analyze this call. We analyze it if either of
1427 -- the following conditions is met:
1429 -- It is an inner level call (since in this case it was triggered
1430 -- by an outer level call from elaboration code), but only if the
1431 -- call is within the scope of the original outer level call.
1433 -- It is an outer level call from elaboration code, or the called
1434 -- entity is in the same elaboration scope.
1436 -- And in these cases, we will check both inter-unit calls and
1437 -- intra-unit (within a single unit) calls.
1439 C_Scope := Current_Scope;
1441 -- If not outer level call, then we follow it if it is within the
1442 -- original scope of the outer call.
1444 if Present (Outer_Scope)
1445 and then Within (Scope (Ent), Outer_Scope)
1451 Outer_Scope => Outer_Scope,
1452 Inter_Unit_Only => False,
1453 In_Init_Proc => In_Init_Proc);
1455 elsif Elaboration_Checks_Suppressed (Current_Scope) then
1458 elsif From_Elab_Code then
1460 Check_A_Call (N, Ent, Standard_Standard, Inter_Unit_Only => False);
1462 elsif Same_Elaboration_Scope (C_Scope, Scope (Ent)) then
1464 Check_A_Call (N, Ent, Scope (Ent), Inter_Unit_Only => False);
1466 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode
1467 -- is set, then we will do the check, but only in the inter-unit case
1468 -- (this is to accommodate unguarded elaboration calls from other units
1469 -- in which this same mode is set). We don't want warnings in this case,
1470 -- it would generate warnings having nothing to do with elaboration.
1472 elsif Dynamic_Elaboration_Checks then
1478 Inter_Unit_Only => True,
1479 Generate_Warnings => False);
1481 -- Otherwise nothing to do
1487 -- A call to an Init_Proc in elaboration code may bring additional
1488 -- dependencies, if some of the record components thereof have
1489 -- initializations that are function calls that come from source. We
1490 -- treat the current node as a call to each of these functions, to check
1491 -- their elaboration impact.
1493 if Is_Init_Proc (Ent)
1494 and then From_Elab_Code
1496 Process_Init_Proc : declare
1497 Unit_Decl : constant Node_Id := Unit_Declaration_Node (Ent);
1499 function Check_Init_Call (Nod : Node_Id) return Traverse_Result;
1500 -- Find subprogram calls within body of Init_Proc for Traverse
1501 -- instantiation below.
1503 procedure Traverse_Body is new Traverse_Proc (Check_Init_Call);
1504 -- Traversal procedure to find all calls with body of Init_Proc
1506 ---------------------
1507 -- Check_Init_Call --
1508 ---------------------
1510 function Check_Init_Call (Nod : Node_Id) return Traverse_Result is
1514 if Nkind (Nod) in N_Subprogram_Call
1515 and then Is_Entity_Name (Name (Nod))
1517 Func := Entity (Name (Nod));
1519 if Comes_From_Source (Func) then
1521 (N, Func, Standard_Standard, Inter_Unit_Only => True);
1529 end Check_Init_Call;
1531 -- Start of processing for Process_Init_Proc
1534 if Nkind (Unit_Decl) = N_Subprogram_Body then
1535 Traverse_Body (Handled_Statement_Sequence (Unit_Decl));
1537 end Process_Init_Proc;
1539 end Check_Elab_Call;
1541 -----------------------
1542 -- Check_Elab_Assign --
1543 -----------------------
1545 procedure Check_Elab_Assign (N : Node_Id) is
1549 Pkg_Spec : Entity_Id;
1550 Pkg_Body : Entity_Id;
1553 -- For record or array component, check prefix. If it is an access type,
1554 -- then there is nothing to do (we do not know what is being assigned),
1555 -- but otherwise this is an assignment to the prefix.
1557 if Nkind (N) = N_Indexed_Component
1559 Nkind (N) = N_Selected_Component
1563 if not Is_Access_Type (Etype (Prefix (N))) then
1564 Check_Elab_Assign (Prefix (N));
1570 -- For type conversion, check expression
1572 if Nkind (N) = N_Type_Conversion then
1573 Check_Elab_Assign (Expression (N));
1577 -- Nothing to do if this is not an entity reference otherwise get entity
1579 if Is_Entity_Name (N) then
1585 -- What we are looking for is a reference in the body of a package that
1586 -- modifies a variable declared in the visible part of the package spec.
1589 and then Comes_From_Source (N)
1590 and then not Suppress_Elaboration_Warnings (Ent)
1591 and then Ekind (Ent) = E_Variable
1592 and then not In_Private_Part (Ent)
1593 and then Is_Library_Level_Entity (Ent)
1595 Scop := Current_Scope;
1597 if No (Scop) or else Scop = Standard_Standard then
1599 elsif Ekind (Scop) = E_Package
1600 and then Is_Compilation_Unit (Scop)
1604 Scop := Scope (Scop);
1608 -- Here Scop points to the containing library package
1611 Pkg_Body := Body_Entity (Pkg_Spec);
1613 -- All OK if the package has an Elaborate_Body pragma
1615 if Has_Pragma_Elaborate_Body (Scop) then
1619 -- OK if entity being modified is not in containing package spec
1621 if not In_Same_Source_Unit (Scop, Ent) then
1625 -- All OK if entity appears in generic package or generic instance.
1626 -- We just get too messed up trying to give proper warnings in the
1627 -- presence of generics. Better no message than a junk one.
1629 Scop := Scope (Ent);
1630 while Present (Scop) and then Scop /= Pkg_Spec loop
1631 if Ekind (Scop) = E_Generic_Package then
1633 elsif Ekind (Scop) = E_Package
1634 and then Is_Generic_Instance (Scop)
1639 Scop := Scope (Scop);
1642 -- All OK if in task, don't issue warnings there
1644 if In_Task_Activation then
1648 -- OK if no package body
1650 if No (Pkg_Body) then
1654 -- OK if reference is not in package body
1656 if not In_Same_Source_Unit (Pkg_Body, N) then
1660 -- OK if package body has no handled statement sequence
1663 HSS : constant Node_Id :=
1664 Handled_Statement_Sequence (Declaration_Node (Pkg_Body));
1666 if No (HSS) or else not Comes_From_Source (HSS) then
1671 -- We definitely have a case of a modification of an entity in
1672 -- the package spec from the elaboration code of the package body.
1673 -- We may not give the warning (because there are some additional
1674 -- checks to avoid too many false positives), but it would be a good
1675 -- idea for the binder to try to keep the body elaboration close to
1676 -- the spec elaboration.
1678 Set_Elaborate_Body_Desirable (Pkg_Spec);
1680 -- All OK in gnat mode (we know what we are doing)
1686 -- All OK if all warnings suppressed
1688 if Warning_Mode = Suppress then
1692 -- All OK if elaboration checks suppressed for entity
1694 if Checks_May_Be_Suppressed (Ent)
1695 and then Is_Check_Suppressed (Ent, Elaboration_Check)
1700 -- OK if the entity is initialized. Note that the No_Initialization
1701 -- flag usually means that the initialization has been rewritten into
1702 -- assignments, but that still counts for us.
1705 Decl : constant Node_Id := Declaration_Node (Ent);
1707 if Nkind (Decl) = N_Object_Declaration
1708 and then (Present (Expression (Decl))
1709 or else No_Initialization (Decl))
1715 -- Here is where we give the warning
1717 -- All OK if warnings suppressed on the entity
1719 if not Has_Warnings_Off (Ent) then
1720 Error_Msg_Sloc := Sloc (Ent);
1723 ("??elaboration code may access& before it is initialized",
1726 ("\??suggest adding pragma Elaborate_Body to spec of &",
1729 ("\??or an explicit initialization could be added #", N);
1732 if not All_Errors_Mode then
1733 Set_Suppress_Elaboration_Warnings (Ent);
1736 end Check_Elab_Assign;
1738 ----------------------
1739 -- Check_Elab_Calls --
1740 ----------------------
1742 procedure Check_Elab_Calls is
1744 -- If expansion is disabled, do not generate any checks. Also skip
1745 -- checks if any subunits are missing because in either case we lack the
1746 -- full information that we need, and no object file will be created in
1749 if not Expander_Active
1750 or else Is_Generic_Unit (Cunit_Entity (Main_Unit))
1751 or else Subunits_Missing
1756 -- Skip delayed calls if we had any errors
1758 if Serious_Errors_Detected = 0 then
1759 Delaying_Elab_Checks := False;
1760 Expander_Mode_Save_And_Set (True);
1762 for J in Delay_Check.First .. Delay_Check.Last loop
1763 Push_Scope (Delay_Check.Table (J).Curscop);
1764 From_Elab_Code := Delay_Check.Table (J).From_Elab_Code;
1766 Check_Internal_Call_Continue (
1767 N => Delay_Check.Table (J).N,
1768 E => Delay_Check.Table (J).E,
1769 Outer_Scope => Delay_Check.Table (J).Outer_Scope,
1770 Orig_Ent => Delay_Check.Table (J).Orig_Ent);
1775 -- Set Delaying_Elab_Checks back on for next main compilation
1777 Expander_Mode_Restore;
1778 Delaying_Elab_Checks := True;
1780 end Check_Elab_Calls;
1782 ------------------------------
1783 -- Check_Elab_Instantiation --
1784 ------------------------------
1786 procedure Check_Elab_Instantiation
1788 Outer_Scope : Entity_Id := Empty)
1793 -- Check for and deal with bad instantiation case. There is some
1794 -- duplicated code here, but we will worry about this later ???
1796 Check_Bad_Instantiation (N);
1798 if ABE_Is_Certain (N) then
1802 -- Nothing to do if we do not have an instantiation (happens in some
1803 -- error cases, and also in the formal package declaration case)
1805 if Nkind (N) not in N_Generic_Instantiation then
1809 -- Nothing to do if inside a generic template
1811 if Inside_A_Generic then
1815 -- Nothing to do if the instantiation is not in the main unit
1817 if not In_Extended_Main_Code_Unit (N) then
1821 Ent := Get_Generic_Entity (N);
1822 From_Elab_Code := not In_Subprogram_Or_Concurrent_Unit;
1824 -- See if we need to analyze this instantiation. We analyze it if
1825 -- either of the following conditions is met:
1827 -- It is an inner level instantiation (since in this case it was
1828 -- triggered by an outer level call from elaboration code), but
1829 -- only if the instantiation is within the scope of the original
1830 -- outer level call.
1832 -- It is an outer level instantiation from elaboration code, or the
1833 -- instantiated entity is in the same elaboration scope.
1835 -- And in these cases, we will check both the inter-unit case and
1836 -- the intra-unit (within a single unit) case.
1838 C_Scope := Current_Scope;
1840 if Present (Outer_Scope)
1841 and then Within (Scope (Ent), Outer_Scope)
1844 Check_A_Call (N, Ent, Outer_Scope, Inter_Unit_Only => False);
1846 elsif From_Elab_Code then
1848 Check_A_Call (N, Ent, Standard_Standard, Inter_Unit_Only => False);
1850 elsif Same_Elaboration_Scope (C_Scope, Scope (Ent)) then
1852 Check_A_Call (N, Ent, Scope (Ent), Inter_Unit_Only => False);
1854 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode is
1855 -- set, then we will do the check, but only in the inter-unit case (this
1856 -- is to accommodate unguarded elaboration calls from other units in
1857 -- which this same mode is set). We inhibit warnings in this case, since
1858 -- this instantiation is not occurring in elaboration code.
1860 elsif Dynamic_Elaboration_Checks then
1866 Inter_Unit_Only => True,
1867 Generate_Warnings => False);
1872 end Check_Elab_Instantiation;
1874 -------------------------
1875 -- Check_Internal_Call --
1876 -------------------------
1878 procedure Check_Internal_Call
1881 Outer_Scope : Entity_Id;
1882 Orig_Ent : Entity_Id)
1884 Inst_Case : constant Boolean := Nkind (N) in N_Generic_Instantiation;
1887 -- If not function or procedure call or instantiation, then ignore
1888 -- call (this happens in some error cases and rewriting cases).
1890 if not Nkind_In (N, N_Function_Call, N_Procedure_Call_Statement)
1891 and then not Inst_Case
1895 -- Nothing to do if this is a call or instantiation that has already
1896 -- been found to be a sure ABE.
1898 elsif ABE_Is_Certain (N) then
1901 -- Nothing to do if errors already detected (avoid cascaded errors)
1903 elsif Serious_Errors_Detected /= 0 then
1906 -- Nothing to do if not in full analysis mode
1908 elsif not Full_Analysis then
1911 -- Nothing to do if analyzing in special spec-expression mode, since the
1912 -- call is not actually being made at this time.
1914 elsif In_Spec_Expression then
1917 -- Nothing to do for call to intrinsic subprogram
1919 elsif Is_Intrinsic_Subprogram (E) then
1922 -- No need to trace local calls if checking task activation, because
1923 -- other local bodies are elaborated already.
1925 elsif In_Task_Activation then
1928 -- Nothing to do if call is within a generic unit
1930 elsif Inside_A_Generic then
1934 -- Delay this call if we are still delaying calls
1936 if Delaying_Elab_Checks then
1937 Delay_Check.Append (
1940 Orig_Ent => Orig_Ent,
1941 Curscop => Current_Scope,
1942 Outer_Scope => Outer_Scope,
1943 From_Elab_Code => From_Elab_Code));
1946 -- Otherwise, call phase 2 continuation right now
1949 Check_Internal_Call_Continue (N, E, Outer_Scope, Orig_Ent);
1951 end Check_Internal_Call;
1953 ----------------------------------
1954 -- Check_Internal_Call_Continue --
1955 ----------------------------------
1957 procedure Check_Internal_Call_Continue
1960 Outer_Scope : Entity_Id;
1961 Orig_Ent : Entity_Id)
1963 Loc : constant Source_Ptr := Sloc (N);
1964 Inst_Case : constant Boolean := Is_Generic_Unit (E);
1969 function Find_Elab_Reference (N : Node_Id) return Traverse_Result;
1970 -- Function applied to each node as we traverse the body. Checks for
1971 -- call or entity reference that needs checking, and if so checks it.
1972 -- Always returns OK, so entire tree is traversed, except that as
1973 -- described below subprogram bodies are skipped for now.
1975 procedure Traverse is new Atree.Traverse_Proc (Find_Elab_Reference);
1976 -- Traverse procedure using above Find_Elab_Reference function
1978 -------------------------
1979 -- Find_Elab_Reference --
1980 -------------------------
1982 function Find_Elab_Reference (N : Node_Id) return Traverse_Result is
1986 -- If user has specified that there are no entry calls in elaboration
1987 -- code, do not trace past an accept statement, because the rendez-
1988 -- vous will happen after elaboration.
1990 if (Nkind (Original_Node (N)) = N_Accept_Statement
1991 or else Nkind (Original_Node (N)) = N_Selective_Accept)
1992 and then Restriction_Active (No_Entry_Calls_In_Elaboration_Code)
1996 -- If we have a function call, check it
1998 elsif Nkind (N) = N_Function_Call then
1999 Check_Elab_Call (N, Outer_Scope);
2002 -- If we have a procedure call, check the call, and also check
2003 -- arguments that are assignments (OUT or IN OUT mode formals).
2005 elsif Nkind (N) = N_Procedure_Call_Statement then
2006 Check_Elab_Call (N, Outer_Scope, In_Init_Proc => Is_Init_Proc (E));
2008 Actual := First_Actual (N);
2009 while Present (Actual) loop
2010 if Known_To_Be_Assigned (Actual) then
2011 Check_Elab_Assign (Actual);
2014 Next_Actual (Actual);
2019 -- If we have an access attribute for a subprogram, check
2020 -- it. Suppress this behavior under debug flag.
2022 elsif not Debug_Flag_Dot_UU
2023 and then Nkind (N) = N_Attribute_Reference
2024 and then (Attribute_Name (N) = Name_Access
2026 Attribute_Name (N) = Name_Unrestricted_Access)
2027 and then Is_Entity_Name (Prefix (N))
2028 and then Is_Subprogram (Entity (Prefix (N)))
2030 Check_Elab_Call (N, Outer_Scope);
2033 -- If we have a generic instantiation, check it
2035 elsif Nkind (N) in N_Generic_Instantiation then
2036 Check_Elab_Instantiation (N, Outer_Scope);
2039 -- Skip subprogram bodies that come from source (wait for call to
2040 -- analyze these). The reason for the come from source test is to
2041 -- avoid catching task bodies.
2043 -- For task bodies, we should really avoid these too, waiting for the
2044 -- task activation, but that's too much trouble to catch for now, so
2045 -- we go in unconditionally. This is not so terrible, it means the
2046 -- error backtrace is not quite complete, and we are too eager to
2047 -- scan bodies of tasks that are unused, but this is hardly very
2050 elsif Nkind (N) = N_Subprogram_Body
2051 and then Comes_From_Source (N)
2055 elsif Nkind (N) = N_Assignment_Statement
2056 and then Comes_From_Source (N)
2058 Check_Elab_Assign (Name (N));
2064 end Find_Elab_Reference;
2066 -- Start of processing for Check_Internal_Call_Continue
2069 -- Save outer level call if at outer level
2071 if Elab_Call.Last = 0 then
2072 Outer_Level_Sloc := Loc;
2075 Elab_Visited.Append (E);
2077 -- If the call is to a function that renames a literal, no check needed
2079 if Ekind (E) = E_Enumeration_Literal then
2083 Sbody := Unit_Declaration_Node (E);
2085 if Nkind (Sbody) /= N_Subprogram_Body
2087 Nkind (Sbody) /= N_Package_Body
2089 Ebody := Corresponding_Body (Sbody);
2094 Sbody := Unit_Declaration_Node (Ebody);
2098 -- If the body appears after the outer level call or instantiation then
2099 -- we have an error case handled below.
2101 if Earlier_In_Extended_Unit (Outer_Level_Sloc, Sloc (Sbody))
2102 and then not In_Task_Activation
2106 -- If we have the instantiation case we are done, since we now
2107 -- know that the body of the generic appeared earlier.
2109 elsif Inst_Case then
2112 -- Otherwise we have a call, so we trace through the called body to see
2113 -- if it has any problems.
2116 pragma Assert (Nkind (Sbody) = N_Subprogram_Body);
2118 Elab_Call.Append ((Cloc => Loc, Ent => E));
2120 if Debug_Flag_LL then
2121 Write_Str ("Elab_Call.Last = ");
2122 Write_Int (Int (Elab_Call.Last));
2123 Write_Str (" Ent = ");
2124 Write_Name (Chars (E));
2126 Write_Location (Sloc (N));
2130 -- Now traverse declarations and statements of subprogram body. Note
2131 -- that we cannot simply Traverse (Sbody), since traverse does not
2132 -- normally visit subprogram bodies.
2137 Decl := First (Declarations (Sbody));
2138 while Present (Decl) loop
2144 Traverse (Handled_Statement_Sequence (Sbody));
2146 Elab_Call.Decrement_Last;
2150 -- Here is the case of calling a subprogram where the body has not yet
2151 -- been encountered. A warning message is needed, except if this is the
2152 -- case of appearing within an aspect specification that results in
2153 -- a check call, we do not really have such a situation, so no warning
2154 -- is needed (e.g. the case of a precondition, where the call appears
2155 -- textually before the body, but in actual fact is moved to the
2156 -- appropriate subprogram body and so does not need a check).
2163 if Nkind (P) in N_Subexpr then
2165 elsif Nkind (P) = N_If_Statement
2166 and then Nkind (Original_Node (P)) = N_Pragma
2167 and then Present (Corresponding_Aspect (Original_Node (P)))
2176 -- Not that special case, warning and dynamic check is required
2178 -- If we have nothing in the call stack, then this is at the outer
2179 -- level, and the ABE is bound to occur.
2181 if Elab_Call.Last = 0 then
2184 ("??cannot instantiate& before body seen", N, Orig_Ent);
2186 Error_Msg_NE ("??cannot call& before body seen", N, Orig_Ent);
2189 Error_Msg_N ("\??Program_Error will be raised at run time", N);
2190 Insert_Elab_Check (N);
2192 -- Call is not at outer level
2195 -- Deal with dynamic elaboration check
2197 if not Elaboration_Checks_Suppressed (E) then
2198 Set_Elaboration_Entity_Required (E);
2200 -- Case of no elaboration entity allocated yet
2202 if No (Elaboration_Entity (E)) then
2204 -- Create object declaration for elaboration entity, and put it
2205 -- just in front of the spec of the subprogram or generic unit,
2206 -- in the same scope as this unit.
2209 Loce : constant Source_Ptr := Sloc (E);
2210 Ent : constant Entity_Id :=
2211 Make_Defining_Identifier (Loc,
2212 Chars => New_External_Name (Chars (E), 'E'));
2215 Set_Elaboration_Entity (E, Ent);
2216 Push_Scope (Scope (E));
2218 Insert_Action (Declaration_Node (E),
2219 Make_Object_Declaration (Loce,
2220 Defining_Identifier => Ent,
2221 Object_Definition =>
2222 New_Occurrence_Of (Standard_Short_Integer, Loce),
2224 Make_Integer_Literal (Loc, Uint_0)));
2226 -- Set elaboration flag at the point of the body
2228 Set_Elaboration_Flag (Sbody, E);
2230 -- Kill current value indication. This is necessary because
2231 -- the tests of this flag are inserted out of sequence and
2232 -- must not pick up bogus indications of the wrong constant
2233 -- value. Also, this is never a true constant, since one way
2234 -- or another, it gets reset.
2236 Set_Current_Value (Ent, Empty);
2237 Set_Last_Assignment (Ent, Empty);
2238 Set_Is_True_Constant (Ent, False);
2243 -- Generate check of the elaboration counter
2245 Insert_Elab_Check (N,
2246 Make_Attribute_Reference (Loc,
2247 Attribute_Name => Name_Elaborated,
2248 Prefix => New_Occurrence_Of (E, Loc)));
2251 -- Generate the warning
2253 if not Suppress_Elaboration_Warnings (E)
2254 and then not Elaboration_Checks_Suppressed (E)
2256 -- Suppress this warning if we have a function call that occurred
2257 -- within an assertion expression, since we can get false warnings
2258 -- in this case, due to the out of order handling in this case.
2260 and then (Nkind (Original_Node (N)) /= N_Function_Call
2261 or else not In_Assertion (Original_Node (N)))
2265 ("instantiation of& may occur before body is seen??",
2269 ("call to& may occur before body is seen??", N, Orig_Ent);
2273 ("\Program_Error may be raised at run time??", N);
2279 -- Set flag to suppress further warnings on same subprogram
2280 -- unless in all errors mode
2282 if not All_Errors_Mode then
2283 Set_Suppress_Elaboration_Warnings (E);
2285 end Check_Internal_Call_Continue;
2287 ---------------------------
2288 -- Check_Task_Activation --
2289 ---------------------------
2291 procedure Check_Task_Activation (N : Node_Id) is
2292 Loc : constant Source_Ptr := Sloc (N);
2293 Inter_Procs : constant Elist_Id := New_Elmt_List;
2294 Intra_Procs : constant Elist_Id := New_Elmt_List;
2297 Task_Scope : Entity_Id;
2298 Cunit_SC : Boolean := False;
2301 Enclosing : Entity_Id;
2303 procedure Add_Task_Proc (Typ : Entity_Id);
2304 -- Add to Task_Procs the task body procedure(s) of task types in Typ.
2305 -- For record types, this procedure recurses over component types.
2307 procedure Collect_Tasks (Decls : List_Id);
2308 -- Collect the types of the tasks that are to be activated in the given
2309 -- list of declarations, in order to perform elaboration checks on the
2310 -- corresponding task procedures which are called implicitly here.
2312 function Outer_Unit (E : Entity_Id) return Entity_Id;
2313 -- find enclosing compilation unit of Entity, ignoring subunits, or
2314 -- else enclosing subprogram. If E is not a package, there is no need
2315 -- for inter-unit elaboration checks.
2321 procedure Add_Task_Proc (Typ : Entity_Id) is
2323 Proc : Entity_Id := Empty;
2326 if Is_Task_Type (Typ) then
2327 Proc := Get_Task_Body_Procedure (Typ);
2329 elsif Is_Array_Type (Typ)
2330 and then Has_Task (Base_Type (Typ))
2332 Add_Task_Proc (Component_Type (Typ));
2334 elsif Is_Record_Type (Typ)
2335 and then Has_Task (Base_Type (Typ))
2337 Comp := First_Component (Typ);
2338 while Present (Comp) loop
2339 Add_Task_Proc (Etype (Comp));
2340 Comp := Next_Component (Comp);
2344 -- If the task type is another unit, we will perform the usual
2345 -- elaboration check on its enclosing unit. If the type is in the
2346 -- same unit, we can trace the task body as for an internal call,
2347 -- but we only need to examine other external calls, because at
2348 -- the point the task is activated, internal subprogram bodies
2349 -- will have been elaborated already. We keep separate lists for
2350 -- each kind of task.
2352 -- Skip this test if errors have occurred, since in this case
2353 -- we can get false indications.
2355 if Serious_Errors_Detected /= 0 then
2359 if Present (Proc) then
2360 if Outer_Unit (Scope (Proc)) = Enclosing then
2362 if No (Corresponding_Body (Unit_Declaration_Node (Proc)))
2364 (not Is_Generic_Instance (Scope (Proc))
2366 Scope (Proc) = Scope (Defining_Identifier (Decl)))
2369 ("task will be activated before elaboration of its body??",
2372 ("\Program_Error will be raised at run time??", Decl);
2375 Present (Corresponding_Body (Unit_Declaration_Node (Proc)))
2377 Append_Elmt (Proc, Intra_Procs);
2381 -- No need for multiple entries of the same type
2383 Elmt := First_Elmt (Inter_Procs);
2384 while Present (Elmt) loop
2385 if Node (Elmt) = Proc then
2392 Append_Elmt (Proc, Inter_Procs);
2401 procedure Collect_Tasks (Decls : List_Id) is
2403 if Present (Decls) then
2404 Decl := First (Decls);
2405 while Present (Decl) loop
2406 if Nkind (Decl) = N_Object_Declaration
2407 and then Has_Task (Etype (Defining_Identifier (Decl)))
2409 Add_Task_Proc (Etype (Defining_Identifier (Decl)));
2421 function Outer_Unit (E : Entity_Id) return Entity_Id is
2426 while Present (Outer) loop
2427 if Elaboration_Checks_Suppressed (Outer) then
2431 exit when Is_Child_Unit (Outer)
2432 or else Scope (Outer) = Standard_Standard
2433 or else Ekind (Outer) /= E_Package;
2434 Outer := Scope (Outer);
2440 -- Start of processing for Check_Task_Activation
2443 Enclosing := Outer_Unit (Current_Scope);
2445 -- Find all tasks declared in the current unit
2447 if Nkind (N) = N_Package_Body then
2448 P := Unit_Declaration_Node (Corresponding_Spec (N));
2450 Collect_Tasks (Declarations (N));
2451 Collect_Tasks (Visible_Declarations (Specification (P)));
2452 Collect_Tasks (Private_Declarations (Specification (P)));
2454 elsif Nkind (N) = N_Package_Declaration then
2455 Collect_Tasks (Visible_Declarations (Specification (N)));
2456 Collect_Tasks (Private_Declarations (Specification (N)));
2459 Collect_Tasks (Declarations (N));
2462 -- We only perform detailed checks in all tasks are library level
2463 -- entities. If the master is a subprogram or task, activation will
2464 -- depend on the activation of the master itself.
2466 -- Should dynamic checks be added in the more general case???
2468 if Ekind (Enclosing) /= E_Package then
2472 -- For task types defined in other units, we want the unit containing
2473 -- the task body to be elaborated before the current one.
2475 Elmt := First_Elmt (Inter_Procs);
2476 while Present (Elmt) loop
2478 Task_Scope := Outer_Unit (Scope (Ent));
2480 if not Is_Compilation_Unit (Task_Scope) then
2483 elsif Suppress_Elaboration_Warnings (Task_Scope)
2484 or else Elaboration_Checks_Suppressed (Task_Scope)
2488 elsif Dynamic_Elaboration_Checks then
2489 if not Elaboration_Checks_Suppressed (Ent)
2490 and then not Cunit_SC
2492 not Restriction_Active (No_Entry_Calls_In_Elaboration_Code)
2494 -- Runtime elaboration check required. Generate check of the
2495 -- elaboration counter for the unit containing the entity.
2497 Insert_Elab_Check (N,
2498 Make_Attribute_Reference (Loc,
2499 Attribute_Name => Name_Elaborated,
2501 New_Occurrence_Of (Spec_Entity (Task_Scope), Loc)));
2505 -- Force the binder to elaborate other unit first
2507 if not Suppress_Elaboration_Warnings (Ent)
2508 and then not Elaboration_Checks_Suppressed (Ent)
2509 and then Elab_Warnings
2510 and then not Suppress_Elaboration_Warnings (Task_Scope)
2511 and then not Elaboration_Checks_Suppressed (Task_Scope)
2513 Error_Msg_Node_2 := Task_Scope;
2515 ("activation of an instance of task type&" &
2516 " requires pragma Elaborate_All on &?l?", N, Ent);
2519 Activate_Elaborate_All_Desirable (N, Task_Scope);
2520 Set_Suppress_Elaboration_Warnings (Task_Scope);
2526 -- For tasks declared in the current unit, trace other calls within
2527 -- the task procedure bodies, which are available.
2529 In_Task_Activation := True;
2531 Elmt := First_Elmt (Intra_Procs);
2532 while Present (Elmt) loop
2534 Check_Internal_Call_Continue (N, Ent, Enclosing, Ent);
2538 In_Task_Activation := False;
2539 end Check_Task_Activation;
2541 --------------------------------
2542 -- Set_Elaboration_Constraint --
2543 --------------------------------
2545 procedure Set_Elaboration_Constraint
2550 Elab_Unit : Entity_Id;
2552 -- Check whether this is a call to an Initialize subprogram for a
2553 -- controlled type. Note that Call can also be a 'Access attribute
2554 -- reference, which now generates an elaboration check.
2556 Init_Call : constant Boolean :=
2557 Nkind (Call) = N_Procedure_Call_Statement
2558 and then Chars (Subp) = Name_Initialize
2559 and then Comes_From_Source (Subp)
2560 and then Present (Parameter_Associations (Call))
2561 and then Is_Controlled (Etype (First_Actual (Call)));
2563 -- If the unit is mentioned in a with_clause of the current unit, it is
2564 -- visible, and we can set the elaboration flag.
2566 if Is_Immediately_Visible (Scop)
2567 or else (Is_Child_Unit (Scop) and then Is_Visible_Lib_Unit (Scop))
2569 Activate_Elaborate_All_Desirable (Call, Scop);
2570 Set_Suppress_Elaboration_Warnings (Scop, True);
2574 -- If this is not an initialization call or a call using object notation
2575 -- we know that the unit of the called entity is in the context, and
2576 -- we can set the flag as well. The unit need not be visible if the call
2577 -- occurs within an instantiation.
2579 if Is_Init_Proc (Subp)
2581 or else Nkind (Original_Node (Call)) = N_Selected_Component
2583 null; -- detailed processing follows.
2586 Activate_Elaborate_All_Desirable (Call, Scop);
2587 Set_Suppress_Elaboration_Warnings (Scop, True);
2591 -- If the unit is not in the context, there must be an intermediate unit
2592 -- that is, on which we need to place to elaboration flag. This happens
2593 -- with init proc calls.
2595 if Is_Init_Proc (Subp)
2598 -- The initialization call is on an object whose type is not declared
2599 -- in the same scope as the subprogram. The type of the object must
2600 -- be a subtype of the type of operation. This object is the first
2601 -- actual in the call.
2604 Typ : constant Entity_Id :=
2605 Etype (First (Parameter_Associations (Call)));
2607 Elab_Unit := Scope (Typ);
2608 while (Present (Elab_Unit))
2609 and then not Is_Compilation_Unit (Elab_Unit)
2611 Elab_Unit := Scope (Elab_Unit);
2615 -- If original node uses selected component notation, the prefix is
2616 -- visible and determines the scope that must be elaborated. After
2617 -- rewriting, the prefix is the first actual in the call.
2619 elsif Nkind (Original_Node (Call)) = N_Selected_Component then
2620 Elab_Unit := Scope (Etype (First (Parameter_Associations (Call))));
2622 -- Not one of special cases above
2625 -- Using previously computed scope. If the elaboration check is
2626 -- done after analysis, the scope is not visible any longer, but
2627 -- must still be in the context.
2632 Activate_Elaborate_All_Desirable (Call, Elab_Unit);
2633 Set_Suppress_Elaboration_Warnings (Elab_Unit, True);
2634 end Set_Elaboration_Constraint;
2636 ------------------------
2637 -- Get_Referenced_Ent --
2638 ------------------------
2640 function Get_Referenced_Ent (N : Node_Id) return Entity_Id is
2644 if Nkind (N) = N_Attribute_Reference then
2652 elsif Nkind (Nam) = N_Selected_Component then
2653 return Entity (Selector_Name (Nam));
2654 elsif not Is_Entity_Name (Nam) then
2657 return Entity (Nam);
2659 end Get_Referenced_Ent;
2661 ----------------------
2662 -- Has_Generic_Body --
2663 ----------------------
2665 function Has_Generic_Body (N : Node_Id) return Boolean is
2666 Ent : constant Entity_Id := Get_Generic_Entity (N);
2667 Decl : constant Node_Id := Unit_Declaration_Node (Ent);
2670 function Find_Body_In (E : Entity_Id; N : Node_Id) return Node_Id;
2671 -- Determine if the list of nodes headed by N and linked by Next
2672 -- contains a package body for the package spec entity E, and if so
2673 -- return the package body. If not, then returns Empty.
2675 function Load_Package_Body (Nam : Unit_Name_Type) return Node_Id;
2676 -- This procedure is called load the unit whose name is given by Nam.
2677 -- This unit is being loaded to see whether it contains an optional
2678 -- generic body. The returned value is the loaded unit, which is always
2679 -- a package body (only package bodies can contain other entities in the
2680 -- sense in which Has_Generic_Body is interested). We only attempt to
2681 -- load bodies if we are generating code. If we are in semantics check
2682 -- only mode, then it would be wrong to load bodies that are not
2683 -- required from a semantic point of view, so in this case we return
2684 -- Empty. The result is that the caller may incorrectly decide that a
2685 -- generic spec does not have a body when in fact it does, but the only
2686 -- harm in this is that some warnings on elaboration problems may be
2687 -- lost in semantic checks only mode, which is not big loss. We also
2688 -- return Empty if we go for a body and it is not there.
2690 function Locate_Corresponding_Body (PE : Entity_Id) return Node_Id;
2691 -- PE is the entity for a package spec. This function locates the
2692 -- corresponding package body, returning Empty if none is found. The
2693 -- package body returned is fully parsed but may not yet be analyzed,
2694 -- so only syntactic fields should be referenced.
2700 function Find_Body_In (E : Entity_Id; N : Node_Id) return Node_Id is
2705 while Present (Nod) loop
2707 -- If we found the package body we are looking for, return it
2709 if Nkind (Nod) = N_Package_Body
2710 and then Chars (Defining_Unit_Name (Nod)) = Chars (E)
2714 -- If we found the stub for the body, go after the subunit,
2715 -- loading it if necessary.
2717 elsif Nkind (Nod) = N_Package_Body_Stub
2718 and then Chars (Defining_Identifier (Nod)) = Chars (E)
2720 if Present (Library_Unit (Nod)) then
2721 return Unit (Library_Unit (Nod));
2724 return Load_Package_Body (Get_Unit_Name (Nod));
2727 -- If neither package body nor stub, keep looking on chain
2737 -----------------------
2738 -- Load_Package_Body --
2739 -----------------------
2741 function Load_Package_Body (Nam : Unit_Name_Type) return Node_Id is
2742 U : Unit_Number_Type;
2745 if Operating_Mode /= Generate_Code then
2758 return Unit (Cunit (U));
2761 end Load_Package_Body;
2763 -------------------------------
2764 -- Locate_Corresponding_Body --
2765 -------------------------------
2767 function Locate_Corresponding_Body (PE : Entity_Id) return Node_Id is
2768 Spec : constant Node_Id := Declaration_Node (PE);
2769 Decl : constant Node_Id := Parent (Spec);
2770 Scop : constant Entity_Id := Scope (PE);
2774 if Is_Library_Level_Entity (PE) then
2776 -- If package is a library unit that requires a body, we have no
2777 -- choice but to go after that body because it might contain an
2778 -- optional body for the original generic package.
2780 if Unit_Requires_Body (PE) then
2782 -- Load the body. Note that we are a little careful here to use
2783 -- Spec to get the unit number, rather than PE or Decl, since
2784 -- in the case where the package is itself a library level
2785 -- instantiation, Spec will properly reference the generic
2786 -- template, which is what we really want.
2790 (Get_Body_Name (Unit_Name (Get_Source_Unit (Spec))));
2792 -- But if the package is a library unit that does NOT require
2793 -- a body, then no body is permitted, so we are sure that there
2794 -- is no body for the original generic package.
2800 -- Otherwise look and see if we are embedded in a further package
2802 elsif Is_Package_Or_Generic_Package (Scop) then
2804 -- If so, get the body of the enclosing package, and look in
2805 -- its package body for the package body we are looking for.
2807 PBody := Locate_Corresponding_Body (Scop);
2812 return Find_Body_In (PE, First (Declarations (PBody)));
2815 -- If we are not embedded in a further package, then the body
2816 -- must be in the same declarative part as we are.
2819 return Find_Body_In (PE, Next (Decl));
2821 end Locate_Corresponding_Body;
2823 -- Start of processing for Has_Generic_Body
2826 if Present (Corresponding_Body (Decl)) then
2829 elsif Unit_Requires_Body (Ent) then
2832 -- Compilation units cannot have optional bodies
2834 elsif Is_Compilation_Unit (Ent) then
2837 -- Otherwise look at what scope we are in
2840 Scop := Scope (Ent);
2842 -- Case of entity is in other than a package spec, in this case
2843 -- the body, if present, must be in the same declarative part.
2845 if not Is_Package_Or_Generic_Package (Scop) then
2850 -- Declaration node may get us a spec, so if so, go to
2851 -- the parent declaration.
2853 P := Declaration_Node (Ent);
2854 while not Is_List_Member (P) loop
2858 return Present (Find_Body_In (Ent, Next (P)));
2861 -- If the entity is in a package spec, then we have to locate
2862 -- the corresponding package body, and look there.
2866 PBody : constant Node_Id := Locate_Corresponding_Body (Scop);
2874 (Find_Body_In (Ent, (First (Declarations (PBody)))));
2879 end Has_Generic_Body;
2881 -----------------------
2882 -- Insert_Elab_Check --
2883 -----------------------
2885 procedure Insert_Elab_Check (N : Node_Id; C : Node_Id := Empty) is
2887 Loc : constant Source_Ptr := Sloc (N);
2890 -- If expansion is disabled, do not generate any checks. Also
2891 -- skip checks if any subunits are missing because in either
2892 -- case we lack the full information that we need, and no object
2893 -- file will be created in any case.
2895 if not Expander_Active or else Subunits_Missing then
2899 -- If we have a generic instantiation, where Instance_Spec is set,
2900 -- then this field points to a generic instance spec that has
2901 -- been inserted before the instantiation node itself, so that
2902 -- is where we want to insert a check.
2904 if Nkind (N) in N_Generic_Instantiation
2905 and then Present (Instance_Spec (N))
2907 Nod := Instance_Spec (N);
2912 -- If we are inserting at the top level, insert in Aux_Decls
2914 if Nkind (Parent (Nod)) = N_Compilation_Unit then
2916 ADN : constant Node_Id := Aux_Decls_Node (Parent (Nod));
2922 Make_Raise_Program_Error (Loc,
2923 Reason => PE_Access_Before_Elaboration);
2926 Make_Raise_Program_Error (Loc,
2927 Condition => Make_Op_Not (Loc, C),
2928 Reason => PE_Access_Before_Elaboration);
2931 if No (Declarations (ADN)) then
2932 Set_Declarations (ADN, New_List (R));
2934 Append_To (Declarations (ADN), R);
2940 -- Otherwise just insert before the node in question. However, if
2941 -- the context of the call has already been analyzed, an insertion
2942 -- will not work if it depends on subsequent expansion (e.g. a call in
2943 -- a branch of a short-circuit). In that case we replace the call with
2944 -- an if expression, or with a Raise if it is unconditional.
2946 -- Unfortunately this does not work if the call has a dynamic size,
2947 -- because gigi regards it as a dynamic-sized temporary. If such a call
2948 -- appears in a short-circuit expression, the elaboration check will be
2949 -- missed (rare enough ???). Otherwise, the code below inserts the check
2950 -- at the appropriate place before the call. Same applies in the even
2951 -- rarer case the return type has a known size but is unconstrained.
2954 if Nkind (N) = N_Function_Call
2955 and then Analyzed (Parent (N))
2956 and then Size_Known_At_Compile_Time (Etype (N))
2958 (not Has_Discriminants (Etype (N))
2959 or else Is_Constrained (Etype (N)))
2963 Typ : constant Entity_Id := Etype (N);
2964 Chk : constant Boolean := Do_Range_Check (N);
2966 R : constant Node_Id :=
2967 Make_Raise_Program_Error (Loc,
2968 Reason => PE_Access_Before_Elaboration);
2979 Reloc_N := Relocate_Node (N);
2980 Save_Interps (N, Reloc_N);
2982 Make_If_Expression (Loc,
2983 Expressions => New_List (C, Reloc_N, R)));
2986 Analyze_And_Resolve (N, Typ);
2988 -- If the original call requires a range check, so does the
2992 Enable_Range_Check (N);
2994 Set_Do_Range_Check (N, False);
3001 Make_Raise_Program_Error (Loc,
3002 Reason => PE_Access_Before_Elaboration));
3005 Make_Raise_Program_Error (Loc,
3009 Reason => PE_Access_Before_Elaboration));
3013 end Insert_Elab_Check;
3015 -------------------------------
3016 -- Is_Finalization_Procedure --
3017 -------------------------------
3019 function Is_Finalization_Procedure (Id : Entity_Id) return Boolean is
3021 -- Check whether Id is a procedure with at least one parameter
3023 if Ekind (Id) = E_Procedure
3024 and then Present (First_Formal (Id))
3027 Typ : constant Entity_Id := Etype (First_Formal (Id));
3028 Deep_Fin : Entity_Id := Empty;
3029 Fin : Entity_Id := Empty;
3032 -- If the type of the first formal does not require finalization
3033 -- actions, then this is definitely not [Deep_]Finalize.
3035 if not Needs_Finalization (Typ) then
3039 -- At this point we have the following scenario:
3041 -- procedure Name (Param1 : [in] [out] Ctrl[; Param2 : ...]);
3043 -- Recover the two possible versions of [Deep_]Finalize using the
3044 -- type of the first parameter and compare with the input.
3046 Deep_Fin := TSS (Typ, TSS_Deep_Finalize);
3048 if Is_Controlled (Typ) then
3049 Fin := Find_Prim_Op (Typ, Name_Finalize);
3053 (Present (Deep_Fin) and then Id = Deep_Fin)
3055 (Present (Fin) and then Id = Fin);
3060 end Is_Finalization_Procedure;
3066 procedure Output_Calls (N : Node_Id) is
3069 function Is_Printable_Error_Name (Nm : Name_Id) return Boolean;
3070 -- An internal function, used to determine if a name, Nm, is either
3071 -- a non-internal name, or is an internal name that is printable
3072 -- by the error message circuits (i.e. it has a single upper
3073 -- case letter at the end).
3075 function Is_Printable_Error_Name (Nm : Name_Id) return Boolean is
3077 if not Is_Internal_Name (Nm) then
3080 elsif Name_Len = 1 then
3084 Name_Len := Name_Len - 1;
3085 return not Is_Internal_Name;
3087 end Is_Printable_Error_Name;
3089 -- Start of processing for Output_Calls
3092 for J in reverse 1 .. Elab_Call.Last loop
3093 Error_Msg_Sloc := Elab_Call.Table (J).Cloc;
3095 Ent := Elab_Call.Table (J).Ent;
3097 if Is_Generic_Unit (Ent) then
3098 Error_Msg_NE ("\??& instantiated #", N, Ent);
3100 elsif Is_Init_Proc (Ent) then
3101 Error_Msg_N ("\??initialization procedure called #", N);
3103 elsif Is_Printable_Error_Name (Chars (Ent)) then
3104 Error_Msg_NE ("\??& called #", N, Ent);
3107 Error_Msg_N ("\?? called #", N);
3112 ----------------------------
3113 -- Same_Elaboration_Scope --
3114 ----------------------------
3116 function Same_Elaboration_Scope (Scop1, Scop2 : Entity_Id) return Boolean is
3121 -- Find elaboration scope for Scop1
3122 -- This is either a subprogram or a compilation unit.
3125 while S1 /= Standard_Standard
3126 and then not Is_Compilation_Unit (S1)
3127 and then (Ekind (S1) = E_Package
3129 Ekind (S1) = E_Protected_Type
3131 Ekind (S1) = E_Block)
3136 -- Find elaboration scope for Scop2
3139 while S2 /= Standard_Standard
3140 and then not Is_Compilation_Unit (S2)
3141 and then (Ekind (S2) = E_Package
3143 Ekind (S2) = E_Protected_Type
3145 Ekind (S2) = E_Block)
3151 end Same_Elaboration_Scope;
3157 procedure Set_C_Scope is
3159 while not Is_Compilation_Unit (C_Scope) loop
3160 C_Scope := Scope (C_Scope);
3168 function Spec_Entity (E : Entity_Id) return Entity_Id is
3172 -- Check for case of body entity
3173 -- Why is the check for E_Void needed???
3175 if Ekind_In (E, E_Void, E_Subprogram_Body, E_Package_Body) then
3179 Decl := Parent (Decl);
3180 exit when Nkind (Decl) in N_Proper_Body;
3183 return Corresponding_Spec (Decl);
3194 procedure Supply_Bodies (N : Node_Id) is
3196 if Nkind (N) = N_Subprogram_Declaration then
3198 Ent : constant Entity_Id := Defining_Unit_Name (Specification (N));
3201 -- Internal subprograms will already have a generated body, so
3202 -- there is no need to provide a stub for them.
3204 if No (Corresponding_Body (N)) then
3206 Loc : constant Source_Ptr := Sloc (N);
3208 Formals : constant List_Id := Copy_Parameter_List (Ent);
3209 Nam : constant Entity_Id :=
3210 Make_Defining_Identifier (Loc, Chars (Ent));
3212 Stats : constant List_Id :=
3214 (Make_Raise_Program_Error (Loc,
3215 Reason => PE_Access_Before_Elaboration));
3218 if Ekind (Ent) = E_Function then
3220 Make_Function_Specification (Loc,
3221 Defining_Unit_Name => Nam,
3222 Parameter_Specifications => Formals,
3223 Result_Definition =>
3225 (Result_Definition (Specification (N))));
3227 -- We cannot reliably make a return statement for this
3228 -- body, but none is needed because the call raises
3231 Set_Return_Present (Ent);
3235 Make_Procedure_Specification (Loc,
3236 Defining_Unit_Name => Nam,
3237 Parameter_Specifications => Formals);
3240 B := Make_Subprogram_Body (Loc,
3241 Specification => Spec,
3242 Declarations => New_List,
3243 Handled_Statement_Sequence =>
3244 Make_Handled_Sequence_Of_Statements (Loc, Stats));
3245 Insert_After (N, B);
3251 elsif Nkind (N) = N_Package_Declaration then
3253 Spec : constant Node_Id := Specification (N);
3255 Push_Scope (Defining_Unit_Name (Spec));
3256 Supply_Bodies (Visible_Declarations (Spec));
3257 Supply_Bodies (Private_Declarations (Spec));
3263 procedure Supply_Bodies (L : List_Id) is
3268 while Present (Elmt) loop
3269 Supply_Bodies (Elmt);
3279 function Within (E1, E2 : Entity_Id) return Boolean is
3286 elsif Scop = Standard_Standard then
3289 Scop := Scope (Scop);
3294 --------------------------
3295 -- Within_Elaborate_All --
3296 --------------------------
3298 function Within_Elaborate_All
3299 (Unit : Unit_Number_Type;
3300 E : Entity_Id) return Boolean
3302 type Unit_Number_Set is array (Main_Unit .. Last_Unit) of Boolean;
3303 pragma Pack (Unit_Number_Set);
3305 Seen : Unit_Number_Set := (others => False);
3306 -- Seen (X) is True after we have seen unit X in the walk. This is used
3307 -- to prevent processing the same unit more than once.
3309 Result : Boolean := False;
3311 procedure Helper (Unit : Unit_Number_Type);
3312 -- This helper procedure does all the work for Within_Elaborate_All. It
3313 -- walks the dependency graph, and sets Result to True if it finds an
3314 -- appropriate Elaborate_All.
3320 procedure Helper (Unit : Unit_Number_Type) is
3321 CU : constant Node_Id := Cunit (Unit);
3325 Elab_Id : Entity_Id;
3332 Seen (Unit) := True;
3335 -- First, check for Elaborate_Alls on this unit
3337 Item := First (Context_Items (CU));
3338 while Present (Item) loop
3339 if Nkind (Item) = N_Pragma
3340 and then Pragma_Name (Item) = Name_Elaborate_All
3342 -- Return if some previous error on the pragma itself
3344 if Error_Posted (Item) then
3350 (Expression (First (Pragma_Argument_Associations (Item))));
3357 Par := Parent (Unit_Declaration_Node (Elab_Id));
3359 Item2 := First (Context_Items (Par));
3360 while Present (Item2) loop
3361 if Nkind (Item2) = N_With_Clause
3362 and then Entity (Name (Item2)) = E
3363 and then not Limited_Present (Item2)
3376 -- Second, recurse on with's. We could do this as part of the above
3377 -- loop, but it's probably more efficient to have two loops, because
3378 -- the relevant Elaborate_All is likely to be on the initial unit. In
3379 -- other words, we're walking the with's breadth-first. This part is
3380 -- only necessary in the dynamic elaboration model.
3382 if Dynamic_Elaboration_Checks then
3383 Item := First (Context_Items (CU));
3384 while Present (Item) loop
3385 if Nkind (Item) = N_With_Clause
3386 and then not Limited_Present (Item)
3388 -- Note: the following call to Get_Cunit_Unit_Number does a
3389 -- linear search, which could be slow, but it's OK because
3390 -- we're about to give a warning anyway. Also, there might
3391 -- be hundreds of units, but not millions. If it turns out
3392 -- to be a problem, we could store the Get_Cunit_Unit_Number
3393 -- in each N_Compilation_Unit node, but that would involve
3394 -- rearranging N_Compilation_Unit_Aux to make room.
3396 Helper (Get_Cunit_Unit_Number (Library_Unit (Item)));
3408 -- Start of processing for Within_Elaborate_All
3413 end Within_Elaborate_All;