1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1997-2008, 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_Util; use Sem_Util;
51 with Sinfo; use Sinfo;
52 with Sinput; use Sinput;
53 with Snames; use Snames;
54 with Stand; use Stand;
56 with Tbuild; use Tbuild;
57 with Uname; use Uname;
59 package body Sem_Elab is
61 -- The following table records the recursive call chain for output in the
62 -- Output routine. Each entry records the call node and the entity of the
63 -- called routine. The number of entries in the table (i.e. the value of
64 -- Elab_Call.Last) indicates the current depth of recursion and is used to
65 -- identify the outer level.
67 type Elab_Call_Entry is record
72 package Elab_Call is new Table.Table (
73 Table_Component_Type => Elab_Call_Entry,
74 Table_Index_Type => Int,
77 Table_Increment => 100,
78 Table_Name => "Elab_Call");
80 -- This table is initialized at the start of each outer level call. It
81 -- holds the entities for all subprograms that have been examined for this
82 -- particular outer level call, and is used to prevent both infinite
83 -- recursion, and useless reanalysis of bodies already seen
85 package Elab_Visited is new Table.Table (
86 Table_Component_Type => Entity_Id,
87 Table_Index_Type => Int,
90 Table_Increment => 100,
91 Table_Name => "Elab_Visited");
93 -- This table stores calls to Check_Internal_Call that are delayed
94 -- until all generics are instantiated, and in particular that all
95 -- generic bodies have been inserted. We need to delay, because we
96 -- need to be able to look through the inserted bodies.
98 type Delay_Element is record
100 -- The parameter N from the call to Check_Internal_Call. Note that
101 -- this node may get rewritten over the delay period by expansion
102 -- in the call case (but not in the instantiation case).
105 -- The parameter E from the call to Check_Internal_Call
107 Orig_Ent : Entity_Id;
108 -- The parameter Orig_Ent from the call to Check_Internal_Call
111 -- The current scope of the call. This is restored when we complete
112 -- the delayed call, so that we do this in the right scope.
114 From_Elab_Code : Boolean;
115 -- Save indication of whether this call is from elaboration code
117 Outer_Scope : Entity_Id;
118 -- Save scope of outer level call
121 package Delay_Check is new Table.Table (
122 Table_Component_Type => Delay_Element,
123 Table_Index_Type => Int,
124 Table_Low_Bound => 1,
125 Table_Initial => 1000,
126 Table_Increment => 100,
127 Table_Name => "Delay_Check");
130 -- Top level scope of current scope. Compute this only once at the outer
131 -- level, i.e. for a call to Check_Elab_Call from outside this unit.
133 Outer_Level_Sloc : Source_Ptr;
134 -- Save Sloc value for outer level call node for comparisons of source
135 -- locations. A body is too late if it appears after the *outer* level
136 -- call, not the particular call that is being analyzed.
138 From_Elab_Code : Boolean;
139 -- This flag shows whether the outer level call currently being examined
140 -- is or is not in elaboration code. We are only interested in calls to
141 -- routines in other units if this flag is True.
143 In_Task_Activation : Boolean := False;
144 -- This flag indicates whether we are performing elaboration checks on
145 -- task procedures, at the point of activation. If true, we do not trace
146 -- internal calls in these procedures, because all local bodies are known
149 Delaying_Elab_Checks : Boolean := True;
150 -- This is set True till the compilation is complete, including the
151 -- insertion of all instance bodies. Then when Check_Elab_Calls is called,
152 -- the delay table is used to make the delayed calls and this flag is reset
153 -- to False, so that the calls are processed
155 -----------------------
156 -- Local Subprograms --
157 -----------------------
159 -- Note: Outer_Scope in all following specs represents the scope of
160 -- interest of the outer level call. If it is set to Standard_Standard,
161 -- then it means the outer level call was at elaboration level, and that
162 -- thus all calls are of interest. If it was set to some other scope,
163 -- then the original call was an inner call, and we are not interested
164 -- in calls that go outside this scope.
166 procedure Activate_Elaborate_All_Desirable (N : Node_Id; U : Entity_Id);
167 -- Analysis of construct N shows that we should set Elaborate_All_Desirable
168 -- for the WITH clause for unit U (which will always be present). A special
169 -- case is when N is a function or procedure instantiation, in which case
170 -- it is sufficient to set Elaborate_Desirable, since in this case there is
171 -- no possibility of transitive elaboration issues.
173 procedure Check_A_Call
176 Outer_Scope : Entity_Id;
177 Inter_Unit_Only : Boolean;
178 Generate_Warnings : Boolean := True);
179 -- This is the internal recursive routine that is called to check for a
180 -- possible elaboration error. The argument N is a subprogram call or
181 -- generic instantiation to be checked, and E is the entity of the called
182 -- subprogram, or instantiated generic unit. The flag Outer_Scope is the
183 -- outer level scope for the original call. Inter_Unit_Only is set if the
184 -- call is only to be checked in the case where it is to another unit (and
185 -- skipped if within a unit). Generate_Warnings is set to False to suppress
186 -- warning messages about missing pragma Elaborate_All's. These messages
187 -- are not wanted for inner calls in the dynamic model.
189 procedure Check_Bad_Instantiation (N : Node_Id);
190 -- N is a node for an instantiation (if called with any other node kind,
191 -- Check_Bad_Instantiation ignores the call). This subprogram checks for
192 -- the special case of a generic instantiation of a generic spec in the
193 -- same declarative part as the instantiation where a body is present and
194 -- has not yet been seen. This is an obvious error, but needs to be checked
195 -- specially at the time of the instantiation, since it is a case where we
196 -- cannot insert the body anywhere. If this case is detected, warnings are
197 -- generated, and a raise of Program_Error is inserted. In addition any
198 -- subprograms in the generic spec are stubbed, and the Bad_Instantiation
199 -- flag is set on the instantiation node. The caller in Sem_Ch12 uses this
200 -- flag as an indication that no attempt should be made to insert an
203 procedure Check_Internal_Call
206 Outer_Scope : Entity_Id;
207 Orig_Ent : Entity_Id);
208 -- N is a function call or procedure statement call node and E is the
209 -- entity of the called function, which is within the current compilation
210 -- unit (where subunits count as part of the parent). This call checks if
211 -- this call, or any call within any accessed body could cause an ABE, and
212 -- if so, outputs a warning. Orig_Ent differs from E only in the case of
213 -- renamings, and points to the original name of the entity. This is used
214 -- for error messages. Outer_Scope is the outer level scope for the
217 procedure Check_Internal_Call_Continue
220 Outer_Scope : Entity_Id;
221 Orig_Ent : Entity_Id);
222 -- The processing for Check_Internal_Call is divided up into two phases,
223 -- and this represents the second phase. The second phase is delayed if
224 -- Delaying_Elab_Calls is set to True. In this delayed case, the first
225 -- phase makes an entry in the Delay_Check table, which is processed when
226 -- Check_Elab_Calls is called. N, E and Orig_Ent are as for the call to
227 -- Check_Internal_Call. Outer_Scope is the outer level scope for the
230 procedure Set_Elaboration_Constraint
234 -- The current unit U may depend semantically on some unit P which is not
235 -- in the current context. If there is an elaboration call that reaches P,
236 -- we need to indicate that P requires an Elaborate_All, but this is not
237 -- effective in U's ali file, if there is no with_clause for P. In this
238 -- case we add the Elaborate_All on the unit Q that directly or indirectly
239 -- makes P available. This can happen in two cases:
241 -- a) Q declares a subtype of a type declared in P, and the call is an
242 -- initialization call for an object of that subtype.
244 -- b) Q declares an object of some tagged type whose root type is
245 -- declared in P, and the initialization call uses object notation on
246 -- that object to reach a primitive operation or a classwide operation
249 -- If P appears in the context of U, the current processing is correct.
250 -- Otherwise we must identify these two cases to retrieve Q and place the
251 -- Elaborate_All_Desirable on it.
253 function Has_Generic_Body (N : Node_Id) return Boolean;
254 -- N is a generic package instantiation node, and this routine determines
255 -- if this package spec does in fact have a generic body. If so, then
256 -- True is returned, otherwise False. Note that this is not at all the
257 -- same as checking if the unit requires a body, since it deals with
258 -- the case of optional bodies accurately (i.e. if a body is optional,
259 -- then it looks to see if a body is actually present). Note: this
260 -- function can only do a fully correct job if in generating code mode
261 -- where all bodies have to be present. If we are operating in semantics
262 -- check only mode, then in some cases of optional bodies, a result of
263 -- False may incorrectly be given. In practice this simply means that
264 -- some cases of warnings for incorrect order of elaboration will only
265 -- be given when generating code, which is not a big problem (and is
266 -- inevitable, given the optional body semantics of Ada).
268 procedure Insert_Elab_Check (N : Node_Id; C : Node_Id := Empty);
269 -- Given code for an elaboration check (or unconditional raise if the check
270 -- is not needed), inserts the code in the appropriate place. N is the call
271 -- or instantiation node for which the check code is required. C is the
272 -- test whose failure triggers the raise.
274 procedure Output_Calls (N : Node_Id);
275 -- Outputs chain of calls stored in the Elab_Call table. The caller has
276 -- already generated the main warning message, so the warnings generated
277 -- are all continuation messages. The argument is the call node at which
278 -- the messages are to be placed.
280 function Same_Elaboration_Scope (Scop1, Scop2 : Entity_Id) return Boolean;
281 -- Given two scopes, determine whether they are the same scope from an
282 -- elaboration point of view, i.e. packages and blocks are ignored.
284 procedure Set_C_Scope;
285 -- On entry C_Scope is set to some scope. On return, C_Scope is reset
286 -- to be the enclosing compilation unit of this scope.
288 function Spec_Entity (E : Entity_Id) return Entity_Id;
289 -- Given a compilation unit entity, if it is a spec entity, it is returned
290 -- unchanged. If it is a body entity, then the spec for the corresponding
293 procedure Supply_Bodies (N : Node_Id);
294 -- Given a node, N, that is either a subprogram declaration or a package
295 -- declaration, this procedure supplies dummy bodies for the subprogram
296 -- or for all subprograms in the package. If the given node is not one
297 -- of these two possibilities, then Supply_Bodies does nothing. The
298 -- dummy body contains a single Raise statement.
300 procedure Supply_Bodies (L : List_Id);
301 -- Calls Supply_Bodies for all elements of the given list L
303 function Within (E1, E2 : Entity_Id) return Boolean;
304 -- Given two scopes E1 and E2, returns True if E1 is equal to E2, or is one
305 -- of its contained scopes, False otherwise.
307 function Within_Elaborate_All (E : Entity_Id) return Boolean;
308 -- Before emitting a warning on a scope E for a missing elaborate_all,
309 -- check whether E may be in the context of a directly visible unit U to
310 -- which the pragma applies. This prevents spurious warnings when the
311 -- called entity is renamed within U.
313 --------------------------------------
314 -- Activate_Elaborate_All_Desirable --
315 --------------------------------------
317 procedure Activate_Elaborate_All_Desirable (N : Node_Id; U : Entity_Id) is
318 UN : constant Unit_Number_Type := Get_Code_Unit (N);
319 CU : constant Node_Id := Cunit (UN);
320 UE : constant Entity_Id := Cunit_Entity (UN);
321 Unm : constant Unit_Name_Type := Unit_Name (UN);
322 CI : constant List_Id := Context_Items (CU);
326 procedure Add_To_Context_And_Mark (Itm : Node_Id);
327 -- This procedure is called when the elaborate indication must be
328 -- applied to a unit not in the context of the referencing unit. The
329 -- unit gets added to the context as an implicit with.
331 function In_Withs_Of (UEs : Entity_Id) return Boolean;
332 -- UEs is the spec entity of a unit. If the unit to be marked is
333 -- in the context item list of this unit spec, then the call returns
334 -- True and Itm is left set to point to the relevant N_With_Clause node.
336 procedure Set_Elab_Flag (Itm : Node_Id);
337 -- Sets Elaborate_[All_]Desirable as appropriate on Itm
339 -----------------------------
340 -- Add_To_Context_And_Mark --
341 -----------------------------
343 procedure Add_To_Context_And_Mark (Itm : Node_Id) is
344 CW : constant Node_Id :=
345 Make_With_Clause (Sloc (Itm),
349 Set_Library_Unit (CW, Library_Unit (Itm));
350 Set_Implicit_With (CW, True);
352 -- Set elaborate all desirable on copy and then append the copy to
353 -- the list of body with's and we are done.
357 end Add_To_Context_And_Mark;
363 function In_Withs_Of (UEs : Entity_Id) return Boolean is
364 UNs : constant Unit_Number_Type := Get_Source_Unit (UEs);
365 CUs : constant Node_Id := Cunit (UNs);
366 CIs : constant List_Id := Context_Items (CUs);
370 while Present (Itm) loop
371 if Nkind (Itm) = N_With_Clause then
373 Cunit_Entity (Get_Cunit_Unit_Number (Library_Unit (Itm)));
390 procedure Set_Elab_Flag (Itm : Node_Id) is
392 if Nkind (N) in N_Subprogram_Instantiation then
393 Set_Elaborate_Desirable (Itm);
395 Set_Elaborate_All_Desirable (Itm);
399 -- Start of processing for Activate_Elaborate_All_Desirable
402 -- Do not set binder indication if expansion is disabled, as when
403 -- compiling a generic unit.
405 if not Expander_Active then
410 while Present (Itm) loop
411 if Nkind (Itm) = N_With_Clause then
412 Ent := Cunit_Entity (Get_Cunit_Unit_Number (Library_Unit (Itm)));
414 -- If we find it, then mark elaborate all desirable and return
425 -- If we fall through then the with clause is not present in the
426 -- current unit. One legitimate possibility is that the with clause
427 -- is present in the spec when we are a body.
429 if Is_Body_Name (Unm)
430 and then In_Withs_Of (Spec_Entity (UE))
432 Add_To_Context_And_Mark (Itm);
436 -- Similarly, we may be in the spec or body of a child unit, where
437 -- the unit in question is with'ed by some ancestor of the child unit.
439 if Is_Child_Name (Unm) then
447 exit when Pkg = Standard_Standard;
449 if In_Withs_Of (Pkg) then
450 Add_To_Context_And_Mark (Itm);
457 -- Here if we do not find with clause on spec or body. We just ignore
458 -- this case, it means that the elaboration involves some other unit
459 -- than the unit being compiled, and will be caught elsewhere.
462 end Activate_Elaborate_All_Desirable;
468 procedure Check_A_Call
471 Outer_Scope : Entity_Id;
472 Inter_Unit_Only : Boolean;
473 Generate_Warnings : Boolean := True)
475 Loc : constant Source_Ptr := Sloc (N);
480 -- Top level scope of entity for called subprogram. This value includes
481 -- following renamings and derivations, so this scope can be in a
482 -- non-visible unit. This is the scope that is to be investigated to
483 -- see whether an elaboration check is required.
486 -- Top level scope of directly called entity for subprogram. This
487 -- differs from E_Scope in the case where renamings or derivations
488 -- are involved, since it does not follow these links. W_Scope is
489 -- generally in a visible unit, and it is this scope that may require
490 -- an Elaborate_All. However, there are some cases (initialization
491 -- calls and calls involving object notation) where W_Scope might not
492 -- be in the context of the current unit, and there is an intermediate
493 -- package that is, in which case the Elaborate_All has to be placed
494 -- on this intermediate package. These special cases are handled in
495 -- Set_Elaboration_Constraint.
497 Body_Acts_As_Spec : Boolean;
498 -- Set to true if call is to body acting as spec (no separate spec)
500 Inst_Case : constant Boolean := Nkind (N) in N_Generic_Instantiation;
501 -- Indicates if we have instantiation case
503 Caller_Unit_Internal : Boolean;
504 Callee_Unit_Internal : Boolean;
506 Inst_Caller : Source_Ptr;
507 Inst_Callee : Source_Ptr;
509 Unit_Caller : Unit_Number_Type;
510 Unit_Callee : Unit_Number_Type;
512 Cunit_SC : Boolean := False;
513 -- Set to suppress dynamic elaboration checks where one of the
514 -- enclosing scopes has Elaboration_Checks_Suppressed set, or else
515 -- if a pragma Elaborate (_All) applies to that scope, in which case
516 -- warnings on the scope are also suppressed. For the internal case,
517 -- we ignore this flag.
520 -- If the call is known to be within a local Suppress Elaboration
521 -- pragma, nothing to check. This can happen in task bodies.
523 if (Nkind (N) = N_Function_Call
524 or else Nkind (N) = N_Procedure_Call_Statement)
525 and then No_Elaboration_Check (N)
530 -- Go to parent for derived subprogram, or to original subprogram in the
531 -- case of a renaming (Alias covers both these cases).
535 if (Suppress_Elaboration_Warnings (Ent)
536 or else Elaboration_Checks_Suppressed (Ent))
537 and then (Inst_Case or else No (Alias (Ent)))
542 -- Nothing to do for imported entities
544 if Is_Imported (Ent) then
548 exit when Inst_Case or else No (Alias (Ent));
552 Decl := Unit_Declaration_Node (Ent);
554 if Nkind (Decl) = N_Subprogram_Body then
555 Body_Acts_As_Spec := True;
557 elsif Nkind (Decl) = N_Subprogram_Declaration
558 or else Nkind (Decl) = N_Subprogram_Body_Stub
561 Body_Acts_As_Spec := False;
563 -- If we have none of an instantiation, subprogram body or
564 -- subprogram declaration, then it is not a case that we want
565 -- to check. (One case is a call to a generic formal subprogram,
566 -- where we do not want the check in the template).
574 if Elaboration_Checks_Suppressed (E_Scope)
575 or else Suppress_Elaboration_Warnings (E_Scope)
580 -- Exit when we get to compilation unit, not counting subunits
582 exit when Is_Compilation_Unit (E_Scope)
583 and then (Is_Child_Unit (E_Scope)
584 or else Scope (E_Scope) = Standard_Standard);
586 -- If we did not find a compilation unit, other than standard,
587 -- then nothing to check (happens in some instantiation cases)
589 if E_Scope = Standard_Standard then
592 -- Otherwise move up a scope looking for compilation unit
595 E_Scope := Scope (E_Scope);
599 -- No checks needed for pure or preelaborated compilation units
602 or else Is_Preelaborated (E_Scope)
607 -- If the generic entity is within a deeper instance than we are, then
608 -- either the instantiation to which we refer itself caused an ABE, in
609 -- which case that will be handled separately, or else we know that the
610 -- body we need appears as needed at the point of the instantiation.
611 -- However, this assumption is only valid if we are in static mode.
613 if not Dynamic_Elaboration_Checks
614 and then Instantiation_Depth (Sloc (Ent)) >
615 Instantiation_Depth (Sloc (N))
620 -- Do not give a warning for a package with no body
622 if Ekind (Ent) = E_Generic_Package
623 and then not Has_Generic_Body (N)
628 -- Case of entity is not in current unit (i.e. with'ed unit case)
630 if E_Scope /= C_Scope then
632 -- We are only interested in such calls if the outer call was from
633 -- elaboration code, or if we are in Dynamic_Elaboration_Checks mode.
635 if not From_Elab_Code and then not Dynamic_Elaboration_Checks then
639 -- Nothing to do if some scope said that no checks were required
645 -- Nothing to do for a generic instance, because in this case the
646 -- checking was at the point of instantiation of the generic However,
647 -- this shortcut is only applicable in static mode.
649 if Is_Generic_Instance (Ent) and not Dynamic_Elaboration_Checks then
653 -- Nothing to do if subprogram with no separate spec. However, a
654 -- call to Deep_Initialize may result in a call to a user-defined
655 -- Initialize procedure, which imposes a body dependency. This
656 -- happens only if the type is controlled and the Initialize
657 -- procedure is not inherited.
659 if Body_Acts_As_Spec then
660 if Is_TSS (Ent, TSS_Deep_Initialize) then
665 Typ := Etype (Next_Formal (First_Formal (Ent)));
667 if not Is_Controlled (Typ) then
670 Init := Find_Prim_Op (Typ, Name_Initialize);
672 if Comes_From_Source (Init) then
685 -- Check cases of internal units
687 Callee_Unit_Internal :=
688 Is_Internal_File_Name
689 (Unit_File_Name (Get_Source_Unit (E_Scope)));
691 -- Do not give a warning if the with'ed unit is internal
692 -- and this is the generic instantiation case (this saves a
693 -- lot of hassle dealing with the Text_IO special child units)
695 if Callee_Unit_Internal and Inst_Case then
699 if C_Scope = Standard_Standard then
700 Caller_Unit_Internal := False;
702 Caller_Unit_Internal :=
703 Is_Internal_File_Name
704 (Unit_File_Name (Get_Source_Unit (C_Scope)));
707 -- Do not give a warning if the with'ed unit is internal
708 -- and the caller is not internal (since the binder always
709 -- elaborates internal units first).
711 if Callee_Unit_Internal and (not Caller_Unit_Internal) then
715 -- For now, if debug flag -gnatdE is not set, do no checking for
716 -- one internal unit withing another. This fixes the problem with
717 -- the sgi build and storage errors. To be resolved later ???
719 if (Callee_Unit_Internal and Caller_Unit_Internal)
720 and then not Debug_Flag_EE
725 if Is_TSS (E, TSS_Deep_Initialize) then
729 -- If the call is in an instance, and the called entity is not
730 -- defined in the same instance, then the elaboration issue
731 -- focuses around the unit containing the template, it is
732 -- this unit which requires an Elaborate_All.
734 -- However, if we are doing dynamic elaboration, we need to
735 -- chase the call in the usual manner.
737 -- We do not handle the case of calling a generic formal correctly
738 -- in the static case. See test 4703-004 to explore this gap ???
740 Inst_Caller := Instantiation (Get_Source_File_Index (Sloc (N)));
741 Inst_Callee := Instantiation (Get_Source_File_Index (Sloc (Ent)));
743 if Inst_Caller = No_Location then
744 Unit_Caller := No_Unit;
746 Unit_Caller := Get_Source_Unit (N);
749 if Inst_Callee = No_Location then
750 Unit_Callee := No_Unit;
752 Unit_Callee := Get_Source_Unit (Ent);
755 if Unit_Caller /= No_Unit
756 and then Unit_Callee /= Unit_Caller
757 and then not Dynamic_Elaboration_Checks
759 E_Scope := Spec_Entity (Cunit_Entity (Unit_Caller));
761 -- If we don't get a spec entity, just ignore call. Not quite
762 -- clear why this check is necessary. ???
768 -- Otherwise step to enclosing compilation unit
770 while not Is_Compilation_Unit (E_Scope) loop
771 E_Scope := Scope (E_Scope);
774 -- For the case N is not an instance, or a call within instance, we
775 -- recompute E_Scope for the error message, since we do NOT want to
776 -- go to the unit which has the ultimate declaration in the case of
777 -- renaming and derivation and we also want to go to the generic unit
778 -- in the case of an instance, and no further.
781 -- Loop to carefully follow renamings and derivations one step
782 -- outside the current unit, but not further.
785 and then Present (Alias (Ent))
787 E_Scope := Alias (Ent);
793 while not Is_Compilation_Unit (E_Scope) loop
794 E_Scope := Scope (E_Scope);
797 -- If E_Scope is the same as C_Scope, it means that there
798 -- definitely was a local renaming or derivation, and we
799 -- are not yet out of the current unit.
801 exit when E_Scope /= C_Scope;
805 -- If no alias, there is a previous error
813 if Within_Elaborate_All (E_Scope) then
817 -- Find top level scope for called entity (not following renamings
818 -- or derivations). This is where the Elaborate_All will go if it
819 -- is needed. We start with the called entity, except in the case
820 -- of an initialization procedure outside the current package, where
821 -- the init proc is in the root package, and we start from the entity
822 -- of the name in the call.
824 if Is_Entity_Name (Name (N))
825 and then Is_Init_Proc (Entity (Name (N)))
826 and then not In_Same_Extended_Unit (N, Entity (Name (N)))
828 W_Scope := Scope (Entity (Name (N)));
833 while not Is_Compilation_Unit (W_Scope) loop
834 W_Scope := Scope (W_Scope);
837 -- Now check if an elaborate_all (or dynamic check) is needed
839 if not Suppress_Elaboration_Warnings (Ent)
840 and then not Elaboration_Checks_Suppressed (Ent)
841 and then not Suppress_Elaboration_Warnings (E_Scope)
842 and then not Elaboration_Checks_Suppressed (E_Scope)
843 and then Elab_Warnings
844 and then Generate_Warnings
846 Generate_Elab_Warnings : declare
847 procedure Elab_Warning
850 Ent : Node_Or_Entity_Id);
851 -- Generate a call to Error_Msg_NE with parameters Msg_D or
852 -- Msg_S (for dynamic or static elaboration model), N and Ent.
858 procedure Elab_Warning
861 Ent : Node_Or_Entity_Id)
864 if Dynamic_Elaboration_Checks then
865 Error_Msg_NE (Msg_D, N, Ent);
867 Error_Msg_NE (Msg_S, N, Ent);
871 -- Start of processing for Generate_Elab_Warnings
876 ("instantiation of& may raise Program_Error?",
877 "info: instantiation of& during elaboration?", Ent);
880 if Nkind (Name (N)) in N_Has_Entity
881 and then Is_Init_Proc (Entity (Name (N)))
882 and then Comes_From_Source (Ent)
885 ("implicit call to & may raise Program_Error?",
886 "info: implicit call to & during elaboration?",
891 ("call to & may raise Program_Error?",
892 "info: call to & during elaboration?",
897 Error_Msg_Qual_Level := Nat'Last;
899 if Nkind (N) in N_Subprogram_Instantiation then
901 ("\missing pragma Elaborate for&?",
902 "\info: implicit pragma Elaborate for& generated?",
906 ("\missing pragma Elaborate_All for&?",
907 "\info: implicit pragma Elaborate_All for & generated?",
910 end Generate_Elab_Warnings;
912 Error_Msg_Qual_Level := 0;
915 -- Set flag to prevent further warnings for same unit unless in
918 if not All_Errors_Mode and not Dynamic_Elaboration_Checks then
919 Set_Suppress_Elaboration_Warnings (W_Scope, True);
923 -- Check for runtime elaboration check required
925 if Dynamic_Elaboration_Checks then
926 if not Elaboration_Checks_Suppressed (Ent)
927 and then not Elaboration_Checks_Suppressed (W_Scope)
928 and then not Elaboration_Checks_Suppressed (E_Scope)
929 and then not Cunit_SC
931 -- Runtime elaboration check required. Generate check of the
932 -- elaboration Boolean for the unit containing the entity.
934 -- Note that for this case, we do check the real unit (the one
935 -- from following renamings, since that is the issue!)
937 -- Could this possibly miss a useless but required PE???
939 Insert_Elab_Check (N,
940 Make_Attribute_Reference (Loc,
941 Attribute_Name => Name_Elaborated,
944 (Spec_Entity (E_Scope), Loc)));
947 -- Case of static elaboration model
950 -- Do not do anything if elaboration checks suppressed. Note that
951 -- we check Ent here, not E, since we want the real entity for the
952 -- body to see if checks are suppressed for it, not the dummy
953 -- entry for renamings or derivations.
955 if Elaboration_Checks_Suppressed (Ent)
956 or else Elaboration_Checks_Suppressed (E_Scope)
957 or else Elaboration_Checks_Suppressed (W_Scope)
961 -- Here we need to generate an implicit elaborate all
964 -- Generate elaborate_all warning unless suppressed
966 if (Elab_Warnings and Generate_Warnings and not Inst_Case)
967 and then not Suppress_Elaboration_Warnings (Ent)
968 and then not Suppress_Elaboration_Warnings (E_Scope)
969 and then not Suppress_Elaboration_Warnings (W_Scope)
971 Error_Msg_Node_2 := W_Scope;
973 ("call to& in elaboration code " &
974 "requires pragma Elaborate_All on&?", N, E);
977 -- Set indication for binder to generate Elaborate_All
979 Set_Elaboration_Constraint (N, E, W_Scope);
983 -- Case of entity is in same unit as call or instantiation
985 elsif not Inter_Unit_Only then
986 Check_Internal_Call (N, Ent, Outer_Scope, E);
990 -----------------------------
991 -- Check_Bad_Instantiation --
992 -----------------------------
994 procedure Check_Bad_Instantiation (N : Node_Id) is
998 -- Nothing to do if we do not have an instantiation (happens in some
999 -- error cases, and also in the formal package declaration case)
1001 if Nkind (N) not in N_Generic_Instantiation then
1004 -- Nothing to do if serious errors detected (avoid cascaded errors)
1006 elsif Serious_Errors_Detected /= 0 then
1009 -- Nothing to do if not in full analysis mode
1011 elsif not Full_Analysis then
1014 -- Nothing to do if inside a generic template
1016 elsif Inside_A_Generic then
1019 -- Nothing to do if a library level instantiation
1021 elsif Nkind (Parent (N)) = N_Compilation_Unit then
1024 -- Nothing to do if we are compiling a proper body for semantic
1025 -- purposes only. The generic body may be in another proper body.
1028 Nkind (Parent (Unit_Declaration_Node (Main_Unit_Entity))) = N_Subunit
1033 Ent := Get_Generic_Entity (N);
1035 -- The case we are interested in is when the generic spec is in the
1036 -- current declarative part
1038 if not Same_Elaboration_Scope (Current_Scope, Scope (Ent))
1039 or else not In_Same_Extended_Unit (N, Ent)
1044 -- If the generic entity is within a deeper instance than we are, then
1045 -- either the instantiation to which we refer itself caused an ABE, in
1046 -- which case that will be handled separately. Otherwise, we know that
1047 -- the body we need appears as needed at the point of the instantiation.
1048 -- If they are both at the same level but not within the same instance
1049 -- then the body of the generic will be in the earlier instance.
1052 D1 : constant Int := Instantiation_Depth (Sloc (Ent));
1053 D2 : constant Int := Instantiation_Depth (Sloc (N));
1060 and then Is_Generic_Instance (Scope (Ent))
1061 and then not In_Open_Scopes (Scope (Ent))
1067 -- Now we can proceed, if the entity being called has a completion,
1068 -- then we are definitely OK, since we have already seen the body.
1070 if Has_Completion (Ent) then
1074 -- If there is no body, then nothing to do
1076 if not Has_Generic_Body (N) then
1080 -- Here we definitely have a bad instantiation
1083 ("?cannot instantiate& before body seen", N, Ent);
1085 if Present (Instance_Spec (N)) then
1086 Supply_Bodies (Instance_Spec (N));
1090 ("\?Program_Error will be raised at run time", N);
1091 Insert_Elab_Check (N);
1092 Set_ABE_Is_Certain (N);
1093 end Check_Bad_Instantiation;
1095 ---------------------
1096 -- Check_Elab_Call --
1097 ---------------------
1099 procedure Check_Elab_Call
1101 Outer_Scope : Entity_Id := Empty)
1106 function Get_Called_Ent return Entity_Id;
1107 -- Retrieve called entity. If this is a call to a protected subprogram,
1108 -- entity is a selected component. The callable entity may be absent,
1109 -- in which case there is no check to perform. This happens with
1110 -- non-analyzed calls in nested generics.
1112 --------------------
1113 -- Get_Called_Ent --
1114 --------------------
1116 function Get_Called_Ent return Entity_Id is
1125 elsif Nkind (Nam) = N_Selected_Component then
1126 return Entity (Selector_Name (Nam));
1128 elsif not Is_Entity_Name (Nam) then
1132 return Entity (Nam);
1136 -- Start of processing for Check_Elab_Call
1139 -- If the call does not come from the main unit, there is nothing to
1140 -- check. Elaboration call from units in the context of the main unit
1141 -- will lead to semantic dependencies when those units are compiled.
1143 if not In_Extended_Main_Code_Unit (N) then
1147 -- For an entry call, check relevant restriction
1149 if Nkind (N) = N_Entry_Call_Statement
1150 and then not In_Subprogram_Or_Concurrent_Unit
1152 Check_Restriction (No_Entry_Calls_In_Elaboration_Code, N);
1154 -- Nothing to do if this is not a call (happens in some error
1155 -- conditions, and in some cases where rewriting occurs).
1157 elsif Nkind (N) /= N_Function_Call
1158 and then Nkind (N) /= N_Procedure_Call_Statement
1162 -- Nothing to do if this is a call already rewritten for elab checking
1164 elsif Nkind (Parent (N)) = N_Conditional_Expression then
1167 -- Nothing to do if inside a generic template
1169 elsif Inside_A_Generic
1170 and then No (Enclosing_Generic_Body (N))
1175 -- Here we have a call at elaboration time which must be checked
1177 if Debug_Flag_LL then
1178 Write_Str (" Check_Elab_Call: ");
1181 or else not Is_Entity_Name (Name (N))
1183 Write_Str ("<<not entity name>> ");
1185 Write_Name (Chars (Entity (Name (N))));
1188 Write_Str (" call at ");
1189 Write_Location (Sloc (N));
1193 -- Climb up the tree to make sure we are not inside default expression
1194 -- of a parameter specification or a record component, since in both
1195 -- these cases, we will be doing the actual call later, not now, and it
1196 -- is at the time of the actual call (statically speaking) that we must
1197 -- do our static check, not at the time of its initial analysis).
1199 -- However, we have to check calls within component definitions (e.g.
1200 -- a function call that determines an array component bound), so we
1201 -- terminate the loop in that case.
1204 while Present (P) loop
1205 if Nkind (P) = N_Parameter_Specification
1207 Nkind (P) = N_Component_Declaration
1211 -- The call occurs within the constraint of a component,
1212 -- so it must be checked.
1214 elsif Nkind (P) = N_Component_Definition then
1222 -- Stuff that happens only at the outer level
1224 if No (Outer_Scope) then
1225 Elab_Visited.Set_Last (0);
1227 -- Nothing to do if current scope is Standard (this is a bit odd, but
1228 -- it happens in the case of generic instantiations).
1230 C_Scope := Current_Scope;
1232 if C_Scope = Standard_Standard then
1236 -- First case, we are in elaboration code
1238 From_Elab_Code := not In_Subprogram_Or_Concurrent_Unit;
1239 if From_Elab_Code then
1241 -- Complain if call that comes from source in preelaborated unit
1242 -- and we are not inside a subprogram (i.e. we are in elab code).
1244 if Comes_From_Source (N)
1245 and then In_Preelaborated_Unit
1246 and then not In_Inlined_Body
1248 -- This is a warning in GNAT mode allowing such calls to be
1249 -- used in the predefined library with appropriate care.
1251 Error_Msg_Warn := GNAT_Mode;
1253 ("<non-static call not allowed in preelaborated unit", N);
1257 -- Second case, we are inside a subprogram or concurrent unit, which
1258 -- means we are not in elaboration code.
1261 -- In this case, the issue is whether we are inside the
1262 -- declarative part of the unit in which we live, or inside its
1263 -- statements. In the latter case, there is no issue of ABE calls
1264 -- at this level (a call from outside to the unit in which we live
1265 -- might cause an ABE, but that will be detected when we analyze
1266 -- that outer level call, as it recurses into the called unit).
1268 -- Climb up the tree, doing this test, and also testing for being
1269 -- inside a default expression, which, as discussed above, is not
1270 -- checked at this stage.
1279 -- If we find a parentless subtree, it seems safe to assume
1280 -- that we are not in a declarative part and that no
1281 -- checking is required.
1287 if Is_List_Member (P) then
1288 L := List_Containing (P);
1295 exit when Nkind (P) = N_Subunit;
1297 -- Filter out case of default expressions, where we do not
1298 -- do the check at this stage.
1300 if Nkind (P) = N_Parameter_Specification
1302 Nkind (P) = N_Component_Declaration
1307 -- A protected body has no elaboration code and contains
1308 -- only other bodies.
1310 if Nkind (P) = N_Protected_Body then
1313 elsif Nkind (P) = N_Subprogram_Body
1315 Nkind (P) = N_Task_Body
1317 Nkind (P) = N_Block_Statement
1319 Nkind (P) = N_Entry_Body
1321 if L = Declarations (P) then
1324 -- We are not in elaboration code, but we are doing
1325 -- dynamic elaboration checks, in this case, we still
1326 -- need to do the call, since the subprogram we are in
1327 -- could be called from another unit, also in dynamic
1328 -- elaboration check mode, at elaboration time.
1330 elsif Dynamic_Elaboration_Checks then
1332 -- This is a rather new check, going into version
1333 -- 3.14a1 for the first time (V1.80 of this unit), so
1334 -- we provide a debug flag to enable it. That way we
1335 -- have an easy work around for regressions that are
1336 -- caused by this new check. This debug flag can be
1339 if Debug_Flag_DD then
1343 -- Do the check in this case
1347 elsif Nkind (P) = N_Task_Body then
1349 -- The check is deferred until Check_Task_Activation
1350 -- but we need to capture local suppress pragmas
1351 -- that may inhibit checks on this call.
1353 Ent := Get_Called_Ent;
1358 elsif Elaboration_Checks_Suppressed (Current_Scope)
1359 or else Elaboration_Checks_Suppressed (Ent)
1360 or else Elaboration_Checks_Suppressed (Scope (Ent))
1362 Set_No_Elaboration_Check (N);
1367 -- Static model, call is not in elaboration code, we
1368 -- never need to worry, because in the static model the
1369 -- top level caller always takes care of things.
1380 Ent := Get_Called_Ent;
1386 -- Nothing to do if this is a recursive call (i.e. a call to
1387 -- an entity that is already in the Elab_Call stack)
1389 for J in 1 .. Elab_Visited.Last loop
1390 if Ent = Elab_Visited.Table (J) then
1395 -- See if we need to analyze this call. We analyze it if either of
1396 -- the following conditions is met:
1398 -- It is an inner level call (since in this case it was triggered
1399 -- by an outer level call from elaboration code), but only if the
1400 -- call is within the scope of the original outer level call.
1402 -- It is an outer level call from elaboration code, or the called
1403 -- entity is in the same elaboration scope.
1405 -- And in these cases, we will check both inter-unit calls and
1406 -- intra-unit (within a single unit) calls.
1408 C_Scope := Current_Scope;
1410 -- If not outer level call, then we follow it if it is within
1411 -- the original scope of the outer call.
1413 if Present (Outer_Scope)
1414 and then Within (Scope (Ent), Outer_Scope)
1417 Check_A_Call (N, Ent, Outer_Scope, Inter_Unit_Only => False);
1419 elsif Elaboration_Checks_Suppressed (Current_Scope) then
1422 elsif From_Elab_Code then
1424 Check_A_Call (N, Ent, Standard_Standard, Inter_Unit_Only => False);
1426 elsif Same_Elaboration_Scope (C_Scope, Scope (Ent)) then
1428 Check_A_Call (N, Ent, Scope (Ent), Inter_Unit_Only => False);
1430 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode
1431 -- is set, then we will do the check, but only in the inter-unit case
1432 -- (this is to accommodate unguarded elaboration calls from other units
1433 -- in which this same mode is set). We don't want warnings in this case,
1434 -- it would generate warnings having nothing to do with elaboration.
1436 elsif Dynamic_Elaboration_Checks then
1442 Inter_Unit_Only => True,
1443 Generate_Warnings => False);
1445 -- Otherwise nothing to do
1451 -- A call to an Init_Proc in elaboration code may bring additional
1452 -- dependencies, if some of the record components thereof have
1453 -- initializations that are function calls that come from source. We
1454 -- treat the current node as a call to each of these functions, to check
1455 -- their elaboration impact.
1457 if Is_Init_Proc (Ent)
1458 and then From_Elab_Code
1460 Process_Init_Proc : declare
1461 Unit_Decl : constant Node_Id := Unit_Declaration_Node (Ent);
1463 function Find_Init_Call (Nod : Node_Id) return Traverse_Result;
1464 -- Find subprogram calls within body of Init_Proc for Traverse
1465 -- instantiation below.
1467 procedure Traverse_Body is new Traverse_Proc (Find_Init_Call);
1468 -- Traversal procedure to find all calls with body of Init_Proc
1470 --------------------
1471 -- Find_Init_Call --
1472 --------------------
1474 function Find_Init_Call (Nod : Node_Id) return Traverse_Result is
1478 if (Nkind (Nod) = N_Function_Call
1479 or else Nkind (Nod) = N_Procedure_Call_Statement)
1480 and then Is_Entity_Name (Name (Nod))
1482 Func := Entity (Name (Nod));
1484 if Comes_From_Source (Func) then
1486 (N, Func, Standard_Standard, Inter_Unit_Only => True);
1496 -- Start of processing for Process_Init_Proc
1499 if Nkind (Unit_Decl) = N_Subprogram_Body then
1500 Traverse_Body (Handled_Statement_Sequence (Unit_Decl));
1502 end Process_Init_Proc;
1504 end Check_Elab_Call;
1506 -----------------------
1507 -- Check_Elab_Assign --
1508 -----------------------
1510 procedure Check_Elab_Assign (N : Node_Id) is
1514 Pkg_Spec : Entity_Id;
1515 Pkg_Body : Entity_Id;
1518 -- For record or array component, check prefix. If it is an access type,
1519 -- then there is nothing to do (we do not know what is being assigned),
1520 -- but otherwise this is an assignment to the prefix.
1522 if Nkind (N) = N_Indexed_Component
1524 Nkind (N) = N_Selected_Component
1528 if not Is_Access_Type (Etype (Prefix (N))) then
1529 Check_Elab_Assign (Prefix (N));
1535 -- For type conversion, check expression
1537 if Nkind (N) = N_Type_Conversion then
1538 Check_Elab_Assign (Expression (N));
1542 -- Nothing to do if this is not an entity reference otherwise get entity
1544 if Is_Entity_Name (N) then
1550 -- What we are looking for is a reference in the body of a package that
1551 -- modifies a variable declared in the visible part of the package spec.
1554 and then Comes_From_Source (N)
1555 and then not Suppress_Elaboration_Warnings (Ent)
1556 and then Ekind (Ent) = E_Variable
1557 and then not In_Private_Part (Ent)
1558 and then Is_Library_Level_Entity (Ent)
1560 Scop := Current_Scope;
1562 if No (Scop) or else Scop = Standard_Standard then
1564 elsif Ekind (Scop) = E_Package
1565 and then Is_Compilation_Unit (Scop)
1569 Scop := Scope (Scop);
1573 -- Here Scop points to the containing library package
1576 Pkg_Body := Body_Entity (Pkg_Spec);
1578 -- All OK if the package has an Elaborate_Body pragma
1580 if Has_Pragma_Elaborate_Body (Scop) then
1584 -- OK if entity being modified is not in containing package spec
1586 if not In_Same_Source_Unit (Scop, Ent) then
1590 -- All OK if entity appears in generic package or generic instance.
1591 -- We just get too messed up trying to give proper warnings in the
1592 -- presence of generics. Better no message than a junk one.
1594 Scop := Scope (Ent);
1595 while Present (Scop) and then Scop /= Pkg_Spec loop
1596 if Ekind (Scop) = E_Generic_Package then
1598 elsif Ekind (Scop) = E_Package
1599 and then Is_Generic_Instance (Scop)
1604 Scop := Scope (Scop);
1607 -- All OK if in task, don't issue warnings there
1609 if In_Task_Activation then
1613 -- OK if no package body
1615 if No (Pkg_Body) then
1619 -- OK if reference is not in package body
1621 if not In_Same_Source_Unit (Pkg_Body, N) then
1625 -- OK if package body has no handled statement sequence
1628 HSS : constant Node_Id :=
1629 Handled_Statement_Sequence (Declaration_Node (Pkg_Body));
1631 if No (HSS) or else not Comes_From_Source (HSS) then
1636 -- We definitely have a case of a modification of an entity in
1637 -- the package spec from the elaboration code of the package body.
1638 -- We may not give the warning (because there are some additional
1639 -- checks to avoid too many false positives), but it would be a good
1640 -- idea for the binder to try to keep the body elaboration close to
1641 -- the spec elaboration.
1643 Set_Elaborate_Body_Desirable (Pkg_Spec);
1645 -- All OK in gnat mode (we know what we are doing)
1651 -- All OK if all warnings suppressed
1653 if Warning_Mode = Suppress then
1657 -- All OK if elaboration checks suppressed for entity
1659 if Checks_May_Be_Suppressed (Ent)
1660 and then Is_Check_Suppressed (Ent, Elaboration_Check)
1665 -- OK if the entity is initialized. Note that the No_Initialization
1666 -- flag usually means that the initialization has been rewritten into
1667 -- assignments, but that still counts for us.
1670 Decl : constant Node_Id := Declaration_Node (Ent);
1672 if Nkind (Decl) = N_Object_Declaration
1673 and then (Present (Expression (Decl))
1674 or else No_Initialization (Decl))
1680 -- Here is where we give the warning
1682 -- All OK if warnings suppressed on the entity
1684 if not Has_Warnings_Off (Ent) then
1685 Error_Msg_Sloc := Sloc (Ent);
1688 ("?elaboration code may access& before it is initialized",
1691 ("\?suggest adding pragma Elaborate_Body to spec of &",
1694 ("\?or an explicit initialization could be added #", N);
1697 if not All_Errors_Mode then
1698 Set_Suppress_Elaboration_Warnings (Ent);
1701 end Check_Elab_Assign;
1703 ----------------------
1704 -- Check_Elab_Calls --
1705 ----------------------
1707 procedure Check_Elab_Calls is
1709 -- If expansion is disabled, do not generate any checks. Also skip
1710 -- checks if any subunits are missing because in either case we lack the
1711 -- full information that we need, and no object file will be created in
1714 if not Expander_Active
1715 or else Is_Generic_Unit (Cunit_Entity (Main_Unit))
1716 or else Subunits_Missing
1721 -- Skip delayed calls if we had any errors
1723 if Serious_Errors_Detected = 0 then
1724 Delaying_Elab_Checks := False;
1725 Expander_Mode_Save_And_Set (True);
1727 for J in Delay_Check.First .. Delay_Check.Last loop
1728 Push_Scope (Delay_Check.Table (J).Curscop);
1729 From_Elab_Code := Delay_Check.Table (J).From_Elab_Code;
1731 Check_Internal_Call_Continue (
1732 N => Delay_Check.Table (J).N,
1733 E => Delay_Check.Table (J).E,
1734 Outer_Scope => Delay_Check.Table (J).Outer_Scope,
1735 Orig_Ent => Delay_Check.Table (J).Orig_Ent);
1740 -- Set Delaying_Elab_Checks back on for next main compilation
1742 Expander_Mode_Restore;
1743 Delaying_Elab_Checks := True;
1745 end Check_Elab_Calls;
1747 ------------------------------
1748 -- Check_Elab_Instantiation --
1749 ------------------------------
1751 procedure Check_Elab_Instantiation
1753 Outer_Scope : Entity_Id := Empty)
1758 -- Check for and deal with bad instantiation case. There is some
1759 -- duplicated code here, but we will worry about this later ???
1761 Check_Bad_Instantiation (N);
1763 if ABE_Is_Certain (N) then
1767 -- Nothing to do if we do not have an instantiation (happens in some
1768 -- error cases, and also in the formal package declaration case)
1770 if Nkind (N) not in N_Generic_Instantiation then
1774 -- Nothing to do if inside a generic template
1776 if Inside_A_Generic then
1780 -- Nothing to do if the instantiation is not in the main unit
1782 if not In_Extended_Main_Code_Unit (N) then
1786 Ent := Get_Generic_Entity (N);
1787 From_Elab_Code := not In_Subprogram_Or_Concurrent_Unit;
1789 -- See if we need to analyze this instantiation. We analyze it if
1790 -- either of the following conditions is met:
1792 -- It is an inner level instantiation (since in this case it was
1793 -- triggered by an outer level call from elaboration code), but
1794 -- only if the instantiation is within the scope of the original
1795 -- outer level call.
1797 -- It is an outer level instantiation from elaboration code, or the
1798 -- instantiated entity is in the same elaboration scope.
1800 -- And in these cases, we will check both the inter-unit case and
1801 -- the intra-unit (within a single unit) case.
1803 C_Scope := Current_Scope;
1805 if Present (Outer_Scope)
1806 and then Within (Scope (Ent), Outer_Scope)
1809 Check_A_Call (N, Ent, Outer_Scope, Inter_Unit_Only => False);
1811 elsif From_Elab_Code then
1813 Check_A_Call (N, Ent, Standard_Standard, Inter_Unit_Only => False);
1815 elsif Same_Elaboration_Scope (C_Scope, Scope (Ent)) then
1817 Check_A_Call (N, Ent, Scope (Ent), Inter_Unit_Only => False);
1819 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode is
1820 -- set, then we will do the check, but only in the inter-unit case (this
1821 -- is to accommodate unguarded elaboration calls from other units in
1822 -- which this same mode is set). We inhibit warnings in this case, since
1823 -- this instantiation is not occurring in elaboration code.
1825 elsif Dynamic_Elaboration_Checks then
1831 Inter_Unit_Only => True,
1832 Generate_Warnings => False);
1837 end Check_Elab_Instantiation;
1839 -------------------------
1840 -- Check_Internal_Call --
1841 -------------------------
1843 procedure Check_Internal_Call
1846 Outer_Scope : Entity_Id;
1847 Orig_Ent : Entity_Id)
1849 Inst_Case : constant Boolean := Nkind (N) in N_Generic_Instantiation;
1852 -- If not function or procedure call or instantiation, then ignore
1853 -- call (this happens in some error case and rewriting cases)
1855 if Nkind (N) /= N_Function_Call
1857 Nkind (N) /= N_Procedure_Call_Statement
1863 -- Nothing to do if this is a call or instantiation that has
1864 -- already been found to be a sure ABE
1866 elsif ABE_Is_Certain (N) then
1869 -- Nothing to do if errors already detected (avoid cascaded errors)
1871 elsif Serious_Errors_Detected /= 0 then
1874 -- Nothing to do if not in full analysis mode
1876 elsif not Full_Analysis then
1879 -- Nothing to do if analyzing in special spec-expression mode, since the
1880 -- call is not actually being made at this time.
1882 elsif In_Spec_Expression then
1885 -- Nothing to do for call to intrinsic subprogram
1887 elsif Is_Intrinsic_Subprogram (E) then
1890 -- No need to trace local calls if checking task activation, because
1891 -- other local bodies are elaborated already.
1893 elsif In_Task_Activation then
1897 -- Delay this call if we are still delaying calls
1899 if Delaying_Elab_Checks then
1900 Delay_Check.Append (
1903 Orig_Ent => Orig_Ent,
1904 Curscop => Current_Scope,
1905 Outer_Scope => Outer_Scope,
1906 From_Elab_Code => From_Elab_Code));
1909 -- Otherwise, call phase 2 continuation right now
1912 Check_Internal_Call_Continue (N, E, Outer_Scope, Orig_Ent);
1914 end Check_Internal_Call;
1916 ----------------------------------
1917 -- Check_Internal_Call_Continue --
1918 ----------------------------------
1920 procedure Check_Internal_Call_Continue
1923 Outer_Scope : Entity_Id;
1924 Orig_Ent : Entity_Id)
1926 Loc : constant Source_Ptr := Sloc (N);
1927 Inst_Case : constant Boolean := Is_Generic_Unit (E);
1932 function Find_Elab_Reference (N : Node_Id) return Traverse_Result;
1933 -- Function applied to each node as we traverse the body. Checks for
1934 -- call or entity reference that needs checking, and if so checks it.
1935 -- Always returns OK, so entire tree is traversed, except that as
1936 -- described below subprogram bodies are skipped for now.
1938 procedure Traverse is new Atree.Traverse_Proc (Find_Elab_Reference);
1939 -- Traverse procedure using above Find_Elab_Reference function
1941 -------------------------
1942 -- Find_Elab_Reference --
1943 -------------------------
1945 function Find_Elab_Reference (N : Node_Id) return Traverse_Result is
1949 -- If user has specified that there are no entry calls in elaboration
1950 -- code, do not trace past an accept statement, because the rendez-
1951 -- vous will happen after elaboration.
1953 if (Nkind (Original_Node (N)) = N_Accept_Statement
1954 or else Nkind (Original_Node (N)) = N_Selective_Accept)
1955 and then Restriction_Active (No_Entry_Calls_In_Elaboration_Code)
1959 -- If we have a function call, check it
1961 elsif Nkind (N) = N_Function_Call then
1962 Check_Elab_Call (N, Outer_Scope);
1965 -- If we have a procedure call, check the call, and also check
1966 -- arguments that are assignments (OUT or IN OUT mode formals).
1968 elsif Nkind (N) = N_Procedure_Call_Statement then
1969 Check_Elab_Call (N, Outer_Scope);
1971 Actual := First_Actual (N);
1972 while Present (Actual) loop
1973 if Known_To_Be_Assigned (Actual) then
1974 Check_Elab_Assign (Actual);
1977 Next_Actual (Actual);
1982 -- If we have a generic instantiation, check it
1984 elsif Nkind (N) in N_Generic_Instantiation then
1985 Check_Elab_Instantiation (N, Outer_Scope);
1988 -- Skip subprogram bodies that come from source (wait for call to
1989 -- analyze these). The reason for the come from source test is to
1990 -- avoid catching task bodies.
1992 -- For task bodies, we should really avoid these too, waiting for the
1993 -- task activation, but that's too much trouble to catch for now, so
1994 -- we go in unconditionally. This is not so terrible, it means the
1995 -- error backtrace is not quite complete, and we are too eager to
1996 -- scan bodies of tasks that are unused, but this is hardly very
1999 elsif Nkind (N) = N_Subprogram_Body
2000 and then Comes_From_Source (N)
2004 elsif Nkind (N) = N_Assignment_Statement
2005 and then Comes_From_Source (N)
2007 Check_Elab_Assign (Name (N));
2013 end Find_Elab_Reference;
2015 -- Start of processing for Check_Internal_Call_Continue
2018 -- Save outer level call if at outer level
2020 if Elab_Call.Last = 0 then
2021 Outer_Level_Sloc := Loc;
2024 Elab_Visited.Append (E);
2026 -- If the call is to a function that renames a literal, no check
2029 if Ekind (E) = E_Enumeration_Literal then
2033 Sbody := Unit_Declaration_Node (E);
2035 if Nkind (Sbody) /= N_Subprogram_Body
2037 Nkind (Sbody) /= N_Package_Body
2039 Ebody := Corresponding_Body (Sbody);
2044 Sbody := Unit_Declaration_Node (Ebody);
2048 -- If the body appears after the outer level call or instantiation then
2049 -- we have an error case handled below.
2051 if Earlier_In_Extended_Unit (Outer_Level_Sloc, Sloc (Sbody))
2052 and then not In_Task_Activation
2056 -- If we have the instantiation case we are done, since we now
2057 -- know that the body of the generic appeared earlier.
2059 elsif Inst_Case then
2062 -- Otherwise we have a call, so we trace through the called body to see
2063 -- if it has any problems.
2066 pragma Assert (Nkind (Sbody) = N_Subprogram_Body);
2068 Elab_Call.Append ((Cloc => Loc, Ent => E));
2070 if Debug_Flag_LL then
2071 Write_Str ("Elab_Call.Last = ");
2072 Write_Int (Int (Elab_Call.Last));
2073 Write_Str (" Ent = ");
2074 Write_Name (Chars (E));
2076 Write_Location (Sloc (N));
2080 -- Now traverse declarations and statements of subprogram body. Note
2081 -- that we cannot simply Traverse (Sbody), since traverse does not
2082 -- normally visit subprogram bodies.
2087 Decl := First (Declarations (Sbody));
2088 while Present (Decl) loop
2094 Traverse (Handled_Statement_Sequence (Sbody));
2096 Elab_Call.Decrement_Last;
2100 -- Here is the case of calling a subprogram where the body has not yet
2101 -- been encountered, a warning message is needed.
2103 -- If we have nothing in the call stack, then this is at the outer
2104 -- level, and the ABE is bound to occur.
2106 if Elab_Call.Last = 0 then
2109 ("?cannot instantiate& before body seen", N, Orig_Ent);
2112 ("?cannot call& before body seen", N, Orig_Ent);
2116 ("\?Program_Error will be raised at run time", N);
2117 Insert_Elab_Check (N);
2119 -- Call is not at outer level
2122 -- Deal with dynamic elaboration check
2124 if not Elaboration_Checks_Suppressed (E) then
2125 Set_Elaboration_Entity_Required (E);
2127 -- Case of no elaboration entity allocated yet
2129 if No (Elaboration_Entity (E)) then
2131 -- Create object declaration for elaboration entity, and put it
2132 -- just in front of the spec of the subprogram or generic unit,
2133 -- in the same scope as this unit.
2136 Loce : constant Source_Ptr := Sloc (E);
2137 Ent : constant Entity_Id :=
2138 Make_Defining_Identifier (Loc,
2139 Chars => New_External_Name (Chars (E), 'E'));
2142 Set_Elaboration_Entity (E, Ent);
2143 Push_Scope (Scope (E));
2145 Insert_Action (Declaration_Node (E),
2146 Make_Object_Declaration (Loce,
2147 Defining_Identifier => Ent,
2148 Object_Definition =>
2149 New_Occurrence_Of (Standard_Boolean, Loce),
2150 Expression => New_Occurrence_Of (Standard_False, Loce)));
2152 -- Set elaboration flag at the point of the body
2154 Set_Elaboration_Flag (Sbody, E);
2156 -- Kill current value indication. This is necessary because
2157 -- the tests of this flag are inserted out of sequence and
2158 -- must not pick up bogus indications of the wrong constant
2159 -- value. Also, this is never a true constant, since one way
2160 -- or another, it gets reset.
2162 Set_Current_Value (Ent, Empty);
2163 Set_Last_Assignment (Ent, Empty);
2164 Set_Is_True_Constant (Ent, False);
2169 -- Generate check of the elaboration Boolean
2171 Insert_Elab_Check (N,
2172 New_Occurrence_Of (Elaboration_Entity (E), Loc));
2175 -- Generate the warning
2177 if not Suppress_Elaboration_Warnings (E)
2178 and then not Elaboration_Checks_Suppressed (E)
2182 ("instantiation of& may occur before body is seen?",
2186 ("call to& may occur before body is seen?", N, Orig_Ent);
2190 ("\Program_Error may be raised at run time?", N);
2196 -- Set flag to suppress further warnings on same subprogram
2197 -- unless in all errors mode
2199 if not All_Errors_Mode then
2200 Set_Suppress_Elaboration_Warnings (E);
2202 end Check_Internal_Call_Continue;
2204 ---------------------------
2205 -- Check_Task_Activation --
2206 ---------------------------
2208 procedure Check_Task_Activation (N : Node_Id) is
2209 Loc : constant Source_Ptr := Sloc (N);
2210 Inter_Procs : constant Elist_Id := New_Elmt_List;
2211 Intra_Procs : constant Elist_Id := New_Elmt_List;
2214 Task_Scope : Entity_Id;
2215 Cunit_SC : Boolean := False;
2218 Enclosing : Entity_Id;
2220 procedure Add_Task_Proc (Typ : Entity_Id);
2221 -- Add to Task_Procs the task body procedure(s) of task types in Typ.
2222 -- For record types, this procedure recurses over component types.
2224 procedure Collect_Tasks (Decls : List_Id);
2225 -- Collect the types of the tasks that are to be activated in the given
2226 -- list of declarations, in order to perform elaboration checks on the
2227 -- corresponding task procedures which are called implicitly here.
2229 function Outer_Unit (E : Entity_Id) return Entity_Id;
2230 -- find enclosing compilation unit of Entity, ignoring subunits, or
2231 -- else enclosing subprogram. If E is not a package, there is no need
2232 -- for inter-unit elaboration checks.
2238 procedure Add_Task_Proc (Typ : Entity_Id) is
2240 Proc : Entity_Id := Empty;
2243 if Is_Task_Type (Typ) then
2244 Proc := Get_Task_Body_Procedure (Typ);
2246 elsif Is_Array_Type (Typ)
2247 and then Has_Task (Base_Type (Typ))
2249 Add_Task_Proc (Component_Type (Typ));
2251 elsif Is_Record_Type (Typ)
2252 and then Has_Task (Base_Type (Typ))
2254 Comp := First_Component (Typ);
2255 while Present (Comp) loop
2256 Add_Task_Proc (Etype (Comp));
2257 Comp := Next_Component (Comp);
2261 -- If the task type is another unit, we will perform the usual
2262 -- elaboration check on its enclosing unit. If the type is in the
2263 -- same unit, we can trace the task body as for an internal call,
2264 -- but we only need to examine other external calls, because at
2265 -- the point the task is activated, internal subprogram bodies
2266 -- will have been elaborated already. We keep separate lists for
2267 -- each kind of task.
2269 -- Skip this test if errors have occurred, since in this case
2270 -- we can get false indications.
2272 if Serious_Errors_Detected /= 0 then
2276 if Present (Proc) then
2277 if Outer_Unit (Scope (Proc)) = Enclosing then
2279 if No (Corresponding_Body (Unit_Declaration_Node (Proc)))
2281 (not Is_Generic_Instance (Scope (Proc))
2283 Scope (Proc) = Scope (Defining_Identifier (Decl)))
2286 ("task will be activated before elaboration of its body?",
2289 ("\Program_Error will be raised at run-time?", Decl);
2292 Present (Corresponding_Body (Unit_Declaration_Node (Proc)))
2294 Append_Elmt (Proc, Intra_Procs);
2298 -- No need for multiple entries of the same type
2300 Elmt := First_Elmt (Inter_Procs);
2301 while Present (Elmt) loop
2302 if Node (Elmt) = Proc then
2309 Append_Elmt (Proc, Inter_Procs);
2318 procedure Collect_Tasks (Decls : List_Id) is
2320 if Present (Decls) then
2321 Decl := First (Decls);
2322 while Present (Decl) loop
2323 if Nkind (Decl) = N_Object_Declaration
2324 and then Has_Task (Etype (Defining_Identifier (Decl)))
2326 Add_Task_Proc (Etype (Defining_Identifier (Decl)));
2338 function Outer_Unit (E : Entity_Id) return Entity_Id is
2343 while Present (Outer) loop
2344 if Elaboration_Checks_Suppressed (Outer) then
2348 exit when Is_Child_Unit (Outer)
2349 or else Scope (Outer) = Standard_Standard
2350 or else Ekind (Outer) /= E_Package;
2351 Outer := Scope (Outer);
2357 -- Start of processing for Check_Task_Activation
2360 Enclosing := Outer_Unit (Current_Scope);
2362 -- Find all tasks declared in the current unit
2364 if Nkind (N) = N_Package_Body then
2365 P := Unit_Declaration_Node (Corresponding_Spec (N));
2367 Collect_Tasks (Declarations (N));
2368 Collect_Tasks (Visible_Declarations (Specification (P)));
2369 Collect_Tasks (Private_Declarations (Specification (P)));
2371 elsif Nkind (N) = N_Package_Declaration then
2372 Collect_Tasks (Visible_Declarations (Specification (N)));
2373 Collect_Tasks (Private_Declarations (Specification (N)));
2376 Collect_Tasks (Declarations (N));
2379 -- We only perform detailed checks in all tasks are library level
2380 -- entities. If the master is a subprogram or task, activation will
2381 -- depend on the activation of the master itself.
2383 -- Should dynamic checks be added in the more general case???
2385 if Ekind (Enclosing) /= E_Package then
2389 -- For task types defined in other units, we want the unit containing
2390 -- the task body to be elaborated before the current one.
2392 Elmt := First_Elmt (Inter_Procs);
2393 while Present (Elmt) loop
2395 Task_Scope := Outer_Unit (Scope (Ent));
2397 if not Is_Compilation_Unit (Task_Scope) then
2400 elsif Suppress_Elaboration_Warnings (Task_Scope)
2401 or else Elaboration_Checks_Suppressed (Task_Scope)
2405 elsif Dynamic_Elaboration_Checks then
2406 if not Elaboration_Checks_Suppressed (Ent)
2407 and then not Cunit_SC
2409 not Restriction_Active (No_Entry_Calls_In_Elaboration_Code)
2411 -- Runtime elaboration check required. Generate check of the
2412 -- elaboration Boolean for the unit containing the entity.
2414 Insert_Elab_Check (N,
2415 Make_Attribute_Reference (Loc,
2416 Attribute_Name => Name_Elaborated,
2419 (Spec_Entity (Task_Scope), Loc)));
2423 -- Force the binder to elaborate other unit first
2425 if not Suppress_Elaboration_Warnings (Ent)
2426 and then not Elaboration_Checks_Suppressed (Ent)
2427 and then Elab_Warnings
2428 and then not Suppress_Elaboration_Warnings (Task_Scope)
2429 and then not Elaboration_Checks_Suppressed (Task_Scope)
2431 Error_Msg_Node_2 := Task_Scope;
2432 Error_Msg_NE ("activation of an instance of task type&" &
2433 " requires pragma Elaborate_All on &?", N, Ent);
2436 Activate_Elaborate_All_Desirable (N, Task_Scope);
2437 Set_Suppress_Elaboration_Warnings (Task_Scope);
2443 -- For tasks declared in the current unit, trace other calls within
2444 -- the task procedure bodies, which are available.
2446 In_Task_Activation := True;
2448 Elmt := First_Elmt (Intra_Procs);
2449 while Present (Elmt) loop
2451 Check_Internal_Call_Continue (N, Ent, Enclosing, Ent);
2455 In_Task_Activation := False;
2456 end Check_Task_Activation;
2458 --------------------------------
2459 -- Set_Elaboration_Constraint --
2460 --------------------------------
2462 procedure Set_Elaboration_Constraint
2467 Elab_Unit : Entity_Id;
2468 Init_Call : constant Boolean :=
2469 Chars (Subp) = Name_Initialize
2470 and then Comes_From_Source (Subp)
2471 and then Present (Parameter_Associations (Call))
2472 and then Is_Controlled (Etype (First_Actual (Call)));
2474 -- If the unit is mentioned in a with_clause of the current unit, it is
2475 -- visible, and we can set the elaboration flag.
2477 if Is_Immediately_Visible (Scop)
2478 or else (Is_Child_Unit (Scop) and then Is_Visible_Child_Unit (Scop))
2480 Activate_Elaborate_All_Desirable (Call, Scop);
2481 Set_Suppress_Elaboration_Warnings (Scop, True);
2485 -- If this is not an initialization call or a call using object notation
2486 -- we know that the unit of the called entity is in the context, and
2487 -- we can set the flag as well. The unit need not be visible if the call
2488 -- occurs within an instantiation.
2490 if Is_Init_Proc (Subp)
2492 or else Nkind (Original_Node (Call)) = N_Selected_Component
2494 null; -- detailed processing follows.
2497 Activate_Elaborate_All_Desirable (Call, Scop);
2498 Set_Suppress_Elaboration_Warnings (Scop, True);
2502 -- If the unit is not in the context, there must be an intermediate unit
2503 -- that is, on which we need to place to elaboration flag. This happens
2504 -- with init proc calls.
2506 if Is_Init_Proc (Subp)
2509 -- The initialization call is on an object whose type is not declared
2510 -- in the same scope as the subprogram. The type of the object must
2511 -- be a subtype of the type of operation. This object is the first
2512 -- actual in the call.
2515 Typ : constant Entity_Id :=
2516 Etype (First (Parameter_Associations (Call)));
2518 Elab_Unit := Scope (Typ);
2519 while (Present (Elab_Unit))
2520 and then not Is_Compilation_Unit (Elab_Unit)
2522 Elab_Unit := Scope (Elab_Unit);
2526 -- If original node uses selected component notation, the prefix is
2527 -- visible and determines the scope that must be elaborated. After
2528 -- rewriting, the prefix is the first actual in the call.
2530 elsif Nkind (Original_Node (Call)) = N_Selected_Component then
2531 Elab_Unit := Scope (Etype (First (Parameter_Associations (Call))));
2533 -- Not one of special cases above
2536 -- Using previously computed scope. If the elaboration check is
2537 -- done after analysis, the scope is not visible any longer, but
2538 -- must still be in the context.
2543 Activate_Elaborate_All_Desirable (Call, Elab_Unit);
2544 Set_Suppress_Elaboration_Warnings (Elab_Unit, True);
2545 end Set_Elaboration_Constraint;
2547 ----------------------
2548 -- Has_Generic_Body --
2549 ----------------------
2551 function Has_Generic_Body (N : Node_Id) return Boolean is
2552 Ent : constant Entity_Id := Get_Generic_Entity (N);
2553 Decl : constant Node_Id := Unit_Declaration_Node (Ent);
2556 function Find_Body_In (E : Entity_Id; N : Node_Id) return Node_Id;
2557 -- Determine if the list of nodes headed by N and linked by Next
2558 -- contains a package body for the package spec entity E, and if so
2559 -- return the package body. If not, then returns Empty.
2561 function Load_Package_Body (Nam : Unit_Name_Type) return Node_Id;
2562 -- This procedure is called load the unit whose name is given by Nam.
2563 -- This unit is being loaded to see whether it contains an optional
2564 -- generic body. The returned value is the loaded unit, which is always
2565 -- a package body (only package bodies can contain other entities in the
2566 -- sense in which Has_Generic_Body is interested). We only attempt to
2567 -- load bodies if we are generating code. If we are in semantics check
2568 -- only mode, then it would be wrong to load bodies that are not
2569 -- required from a semantic point of view, so in this case we return
2570 -- Empty. The result is that the caller may incorrectly decide that a
2571 -- generic spec does not have a body when in fact it does, but the only
2572 -- harm in this is that some warnings on elaboration problems may be
2573 -- lost in semantic checks only mode, which is not big loss. We also
2574 -- return Empty if we go for a body and it is not there.
2576 function Locate_Corresponding_Body (PE : Entity_Id) return Node_Id;
2577 -- PE is the entity for a package spec. This function locates the
2578 -- corresponding package body, returning Empty if none is found. The
2579 -- package body returned is fully parsed but may not yet be analyzed,
2580 -- so only syntactic fields should be referenced.
2586 function Find_Body_In (E : Entity_Id; N : Node_Id) return Node_Id is
2591 while Present (Nod) loop
2593 -- If we found the package body we are looking for, return it
2595 if Nkind (Nod) = N_Package_Body
2596 and then Chars (Defining_Unit_Name (Nod)) = Chars (E)
2600 -- If we found the stub for the body, go after the subunit,
2601 -- loading it if necessary.
2603 elsif Nkind (Nod) = N_Package_Body_Stub
2604 and then Chars (Defining_Identifier (Nod)) = Chars (E)
2606 if Present (Library_Unit (Nod)) then
2607 return Unit (Library_Unit (Nod));
2610 return Load_Package_Body (Get_Unit_Name (Nod));
2613 -- If neither package body nor stub, keep looking on chain
2623 -----------------------
2624 -- Load_Package_Body --
2625 -----------------------
2627 function Load_Package_Body (Nam : Unit_Name_Type) return Node_Id is
2628 U : Unit_Number_Type;
2631 if Operating_Mode /= Generate_Code then
2644 return Unit (Cunit (U));
2647 end Load_Package_Body;
2649 -------------------------------
2650 -- Locate_Corresponding_Body --
2651 -------------------------------
2653 function Locate_Corresponding_Body (PE : Entity_Id) return Node_Id is
2654 Spec : constant Node_Id := Declaration_Node (PE);
2655 Decl : constant Node_Id := Parent (Spec);
2656 Scop : constant Entity_Id := Scope (PE);
2660 if Is_Library_Level_Entity (PE) then
2662 -- If package is a library unit that requires a body, we have no
2663 -- choice but to go after that body because it might contain an
2664 -- optional body for the original generic package.
2666 if Unit_Requires_Body (PE) then
2668 -- Load the body. Note that we are a little careful here to use
2669 -- Spec to get the unit number, rather than PE or Decl, since
2670 -- in the case where the package is itself a library level
2671 -- instantiation, Spec will properly reference the generic
2672 -- template, which is what we really want.
2676 (Get_Body_Name (Unit_Name (Get_Source_Unit (Spec))));
2678 -- But if the package is a library unit that does NOT require
2679 -- a body, then no body is permitted, so we are sure that there
2680 -- is no body for the original generic package.
2686 -- Otherwise look and see if we are embedded in a further package
2688 elsif Is_Package_Or_Generic_Package (Scop) then
2690 -- If so, get the body of the enclosing package, and look in
2691 -- its package body for the package body we are looking for.
2693 PBody := Locate_Corresponding_Body (Scop);
2698 return Find_Body_In (PE, First (Declarations (PBody)));
2701 -- If we are not embedded in a further package, then the body
2702 -- must be in the same declarative part as we are.
2705 return Find_Body_In (PE, Next (Decl));
2707 end Locate_Corresponding_Body;
2709 -- Start of processing for Has_Generic_Body
2712 if Present (Corresponding_Body (Decl)) then
2715 elsif Unit_Requires_Body (Ent) then
2718 -- Compilation units cannot have optional bodies
2720 elsif Is_Compilation_Unit (Ent) then
2723 -- Otherwise look at what scope we are in
2726 Scop := Scope (Ent);
2728 -- Case of entity is in other than a package spec, in this case
2729 -- the body, if present, must be in the same declarative part.
2731 if not Is_Package_Or_Generic_Package (Scop) then
2736 -- Declaration node may get us a spec, so if so, go to
2737 -- the parent declaration.
2739 P := Declaration_Node (Ent);
2740 while not Is_List_Member (P) loop
2744 return Present (Find_Body_In (Ent, Next (P)));
2747 -- If the entity is in a package spec, then we have to locate
2748 -- the corresponding package body, and look there.
2752 PBody : constant Node_Id := Locate_Corresponding_Body (Scop);
2760 (Find_Body_In (Ent, (First (Declarations (PBody)))));
2765 end Has_Generic_Body;
2767 -----------------------
2768 -- Insert_Elab_Check --
2769 -----------------------
2771 procedure Insert_Elab_Check (N : Node_Id; C : Node_Id := Empty) is
2773 Loc : constant Source_Ptr := Sloc (N);
2776 -- If expansion is disabled, do not generate any checks. Also
2777 -- skip checks if any subunits are missing because in either
2778 -- case we lack the full information that we need, and no object
2779 -- file will be created in any case.
2781 if not Expander_Active or else Subunits_Missing then
2785 -- If we have a generic instantiation, where Instance_Spec is set,
2786 -- then this field points to a generic instance spec that has
2787 -- been inserted before the instantiation node itself, so that
2788 -- is where we want to insert a check.
2790 if Nkind (N) in N_Generic_Instantiation
2791 and then Present (Instance_Spec (N))
2793 Nod := Instance_Spec (N);
2798 -- If we are inserting at the top level, insert in Aux_Decls
2800 if Nkind (Parent (Nod)) = N_Compilation_Unit then
2802 ADN : constant Node_Id := Aux_Decls_Node (Parent (Nod));
2808 Make_Raise_Program_Error (Loc,
2809 Reason => PE_Access_Before_Elaboration);
2812 Make_Raise_Program_Error (Loc,
2813 Condition => Make_Op_Not (Loc, C),
2814 Reason => PE_Access_Before_Elaboration);
2817 if No (Declarations (ADN)) then
2818 Set_Declarations (ADN, New_List (R));
2820 Append_To (Declarations (ADN), R);
2826 -- Otherwise just insert before the node in question. However, if
2827 -- the context of the call has already been analyzed, an insertion
2828 -- will not work if it depends on subsequent expansion (e.g. a call in
2829 -- a branch of a short-circuit). In that case we replace the call with
2830 -- a conditional expression, or with a Raise if it is unconditional.
2831 -- Unfortunately this does not work if the call has a dynamic size,
2832 -- because gigi regards it as a dynamic-sized temporary. If such a call
2833 -- appears in a short-circuit expression, the elaboration check will be
2834 -- missed (rare enough ???). Otherwise, the code below inserts the check
2835 -- at the appropriate place before the call. Same applies in the even
2836 -- rarer case the return type has a known size but is unconstrained.
2839 if Nkind (N) = N_Function_Call
2840 and then Analyzed (Parent (N))
2841 and then Size_Known_At_Compile_Time (Etype (N))
2843 (not Has_Discriminants (Etype (N))
2844 or else Is_Constrained (Etype (N)))
2848 Typ : constant Entity_Id := Etype (N);
2849 Chk : constant Boolean := Do_Range_Check (N);
2851 R : constant Node_Id :=
2852 Make_Raise_Program_Error (Loc,
2853 Reason => PE_Access_Before_Elaboration);
2863 Make_Conditional_Expression (Loc,
2864 Expressions => New_List (C, Relocate_Node (N), R)));
2867 Analyze_And_Resolve (N, Typ);
2869 -- If the original call requires a range check, so does the
2870 -- conditional expression.
2873 Enable_Range_Check (N);
2875 Set_Do_Range_Check (N, False);
2882 Make_Raise_Program_Error (Loc,
2883 Reason => PE_Access_Before_Elaboration));
2886 Make_Raise_Program_Error (Loc,
2890 Reason => PE_Access_Before_Elaboration));
2894 end Insert_Elab_Check;
2900 procedure Output_Calls (N : Node_Id) is
2903 function Is_Printable_Error_Name (Nm : Name_Id) return Boolean;
2904 -- An internal function, used to determine if a name, Nm, is either
2905 -- a non-internal name, or is an internal name that is printable
2906 -- by the error message circuits (i.e. it has a single upper
2907 -- case letter at the end).
2909 function Is_Printable_Error_Name (Nm : Name_Id) return Boolean is
2911 if not Is_Internal_Name (Nm) then
2914 elsif Name_Len = 1 then
2918 Name_Len := Name_Len - 1;
2919 return not Is_Internal_Name;
2921 end Is_Printable_Error_Name;
2923 -- Start of processing for Output_Calls
2926 for J in reverse 1 .. Elab_Call.Last loop
2927 Error_Msg_Sloc := Elab_Call.Table (J).Cloc;
2929 Ent := Elab_Call.Table (J).Ent;
2931 if Is_Generic_Unit (Ent) then
2932 Error_Msg_NE ("\?& instantiated #", N, Ent);
2934 elsif Is_Init_Proc (Ent) then
2935 Error_Msg_N ("\?initialization procedure called #", N);
2937 elsif Is_Printable_Error_Name (Chars (Ent)) then
2938 Error_Msg_NE ("\?& called #", N, Ent);
2941 Error_Msg_N ("\? called #", N);
2946 ----------------------------
2947 -- Same_Elaboration_Scope --
2948 ----------------------------
2950 function Same_Elaboration_Scope (Scop1, Scop2 : Entity_Id) return Boolean is
2955 -- Find elaboration scope for Scop1
2956 -- This is either a subprogram or a compilation unit.
2959 while S1 /= Standard_Standard
2960 and then not Is_Compilation_Unit (S1)
2961 and then (Ekind (S1) = E_Package
2963 Ekind (S1) = E_Protected_Type
2965 Ekind (S1) = E_Block)
2970 -- Find elaboration scope for Scop2
2973 while S2 /= Standard_Standard
2974 and then not Is_Compilation_Unit (S2)
2975 and then (Ekind (S2) = E_Package
2977 Ekind (S2) = E_Protected_Type
2979 Ekind (S2) = E_Block)
2985 end Same_Elaboration_Scope;
2991 procedure Set_C_Scope is
2993 while not Is_Compilation_Unit (C_Scope) loop
2994 C_Scope := Scope (C_Scope);
3002 function Spec_Entity (E : Entity_Id) return Entity_Id is
3006 -- Check for case of body entity
3007 -- Why is the check for E_Void needed???
3009 if Ekind (E) = E_Void
3010 or else Ekind (E) = E_Subprogram_Body
3011 or else Ekind (E) = E_Package_Body
3016 Decl := Parent (Decl);
3017 exit when Nkind (Decl) in N_Proper_Body;
3020 return Corresponding_Spec (Decl);
3031 procedure Supply_Bodies (N : Node_Id) is
3033 if Nkind (N) = N_Subprogram_Declaration then
3035 Ent : constant Entity_Id := Defining_Unit_Name (Specification (N));
3038 -- Internal subprograms will already have a generated body, so
3039 -- there is no need to provide a stub for them.
3041 if No (Corresponding_Body (N)) then
3043 Loc : constant Source_Ptr := Sloc (N);
3045 Formals : constant List_Id :=
3046 Copy_Parameter_List (Ent);
3047 Nam : constant Entity_Id :=
3048 Make_Defining_Identifier (Loc, Chars (Ent));
3050 Stats : constant List_Id :=
3052 (Make_Raise_Program_Error (Loc,
3053 Reason => PE_Access_Before_Elaboration));
3055 if Ekind (Ent) = E_Function then
3057 Make_Function_Specification (Loc,
3058 Defining_Unit_Name => Nam,
3059 Parameter_Specifications => Formals,
3060 Result_Definition =>
3062 (Result_Definition (Specification (N))));
3064 -- We cannot reliably make a return statement for this
3065 -- body, but none is needed because the call raises
3068 Set_Return_Present (Ent);
3072 Make_Procedure_Specification (Loc,
3073 Defining_Unit_Name => Nam,
3074 Parameter_Specifications => Formals);
3077 B := Make_Subprogram_Body (Loc,
3078 Specification => Spec,
3079 Declarations => New_List,
3080 Handled_Statement_Sequence =>
3081 Make_Handled_Sequence_Of_Statements (Loc, Stats));
3082 Insert_After (N, B);
3088 elsif Nkind (N) = N_Package_Declaration then
3090 Spec : constant Node_Id := Specification (N);
3092 Push_Scope (Defining_Unit_Name (Spec));
3093 Supply_Bodies (Visible_Declarations (Spec));
3094 Supply_Bodies (Private_Declarations (Spec));
3100 procedure Supply_Bodies (L : List_Id) is
3105 while Present (Elmt) loop
3106 Supply_Bodies (Elmt);
3116 function Within (E1, E2 : Entity_Id) return Boolean is
3123 elsif Scop = Standard_Standard then
3126 Scop := Scope (Scop);
3131 --------------------------
3132 -- Within_Elaborate_All --
3133 --------------------------
3135 function Within_Elaborate_All (E : Entity_Id) return Boolean is
3138 Elab_Id : Entity_Id;
3142 Item := First (Context_Items (Cunit (Current_Sem_Unit)));
3143 while Present (Item) loop
3144 if Nkind (Item) = N_Pragma
3145 and then Pragma_Name (Item) = Name_Elaborate_All
3147 -- Return if some previous error on the pragma itself
3149 if Error_Posted (Item) then
3155 (Expression (First (Pragma_Argument_Associations (Item))));
3157 Par := Parent (Unit_Declaration_Node (Elab_Id));
3159 Item2 := First (Context_Items (Par));
3160 while Present (Item2) loop
3161 if Nkind (Item2) = N_With_Clause
3162 and then Entity (Name (Item2)) = E
3175 end Within_Elaborate_All;