1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
10 -- Copyright (C) 1997-2002 Free Software Foundation, Inc. --
12 -- GNAT is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNAT; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
23 -- GNAT was originally developed by the GNAT team at New York University. --
24 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
26 ------------------------------------------------------------------------------
28 with Atree
; use Atree
;
29 with Checks
; use Checks
;
30 with Debug
; use Debug
;
31 with Einfo
; use Einfo
;
32 with Elists
; use Elists
;
33 with Errout
; use Errout
;
34 with Exp_Util
; use Exp_Util
;
35 with Expander
; use Expander
;
36 with Fname
; use Fname
;
38 with Lib
.Load
; use Lib
.Load
;
39 with Namet
; use Namet
;
40 with Nlists
; use Nlists
;
41 with Nmake
; use Nmake
;
43 with Output
; use Output
;
44 with Restrict
; use Restrict
;
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
62 -- in the Output routine. Each entry records the call node and the
63 -- entity of the called routine. The number of entries in the table
64 -- (i.e. the value of Elab_Call.Last) indicates the current depth
65 -- of recursion and is used to 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.
81 -- It holds the entities for all subprograms that have been examined
82 -- for this particular outer level call, and is used to prevent both
83 -- infinite 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
122 package Delay_Check
is new Table
.Table
(
123 Table_Component_Type
=> Delay_Element
,
124 Table_Index_Type
=> Int
,
125 Table_Low_Bound
=> 1,
126 Table_Initial
=> 1000,
127 Table_Increment
=> 100,
128 Table_Name
=> "Delay_Check");
131 -- Top level scope of current scope. We need to compute this only
132 -- once at the outer level, i.e. for a call to Check_Elab_Call from
133 -- outside this unit.
135 Outer_Level_Sloc
: Source_Ptr
;
136 -- Save Sloc value for outer level call node for comparisons of source
137 -- locations. A body is too late if it appears after the *outer* level
138 -- call, not the particular call that is being analyzed.
140 From_Elab_Code
: Boolean;
141 -- This flag shows whether the outer level call currently being examined
142 -- is or is not in elaboration code. We are only interested in calls to
143 -- routines in other units if this flag is True.
145 In_Task_Activation
: Boolean := False;
146 -- This flag indicates whether we are performing elaboration checks on
147 -- task procedures, at the point of activation. If true, we do not trace
148 -- internal calls in these procedures, because all local bodies are known
151 Delaying_Elab_Checks
: Boolean := True;
152 -- This is set True till the compilation is complete, including the
153 -- insertion of all instance bodies. Then when Check_Elab_Calls is
154 -- called, the delay table is used to make the delayed calls and
155 -- this flag is reset to False, so that the calls are processed
157 -----------------------
158 -- Local Subprograms --
159 -----------------------
161 -- Note: Outer_Scope in all these calls represents the scope of
162 -- interest of the outer level call. If it is set to Standard_Standard,
163 -- then it means the outer level call was at elaboration level, and that
164 -- thus all calls are of interest. If it was set to some other scope,
165 -- then the original call was an inner call, and we are not interested
166 -- in calls that go outside this scope.
168 procedure Check_A_Call
171 Outer_Scope
: Entity_Id
;
172 Inter_Unit_Only
: Boolean;
173 Generate_Warnings
: Boolean := True);
174 -- This is the internal recursive routine that is called to check for
175 -- a possible elaboration error. The argument N is a subprogram call
176 -- or generic instantiation to be checked, and E is the entity of
177 -- the called subprogram, or instantiated generic unit. The flag
178 -- Outer_Scope is the outer level scope for the original call.
179 -- Inter_Unit_Only is set if the call is only to be checked in the
180 -- case where it is to another unit (and skipped if within a unit).
181 -- Generate_Warnings is set to False to suppress warning messages
182 -- about missing pragma Elaborate_All's. These messages are not
183 -- wanted for inner calls in the dynamic model.
185 procedure Check_Bad_Instantiation
(N
: Node_Id
);
186 -- N is a node for an instantiation (if called with any other node kind,
187 -- Check_Bad_Instantiation ignores the call). This subprogram checks for
188 -- the special case of a generic instantiation of a generic spec in the
189 -- same declarative part as the instantiation where a body is present and
190 -- has not yet been seen. This is an obvious error, but needs to be checked
191 -- specially at the time of the instantiation, since it is a case where we
192 -- cannot insert the body anywhere. If this case is detected, warnings are
193 -- generated, and a raise of Program_Error is inserted. In addition any
194 -- subprograms in the generic spec are stubbed, and the Bad_Instantiation
195 -- flag is set on the instantiation node. The caller in Sem_Ch12 uses this
196 -- flag as an indication that no attempt should be made to insert an
199 procedure Check_Internal_Call
202 Outer_Scope
: Entity_Id
;
203 Orig_Ent
: Entity_Id
);
204 -- N is a function call or procedure statement call node and E is
205 -- the entity of the called function, which is within the current
206 -- compilation unit (where subunits count as part of the parent).
207 -- This call checks if this call, or any call within any accessed
208 -- body could cause an ABE, and if so, outputs a warning. Orig_Ent
209 -- differs from E only in the case of renamings, and points to the
210 -- original name of the entity. This is used for error messages.
211 -- Outer_Scope is the outer level scope for the original call.
213 procedure Check_Internal_Call_Continue
216 Outer_Scope
: Entity_Id
;
217 Orig_Ent
: Entity_Id
);
218 -- The processing for Check_Internal_Call is divided up into two phases,
219 -- and this represents the second phase. The second phase is delayed if
220 -- Delaying_Elab_Calls is set to True. In this delayed case, the first
221 -- phase makes an entry in the Delay_Check table, which is processed
222 -- when Check_Elab_Calls is called. N, E and Orig_Ent are as for the call
223 -- to Check_Internal_Call. Outer_Scope is the outer level scope for
224 -- the original call.
226 function Has_Generic_Body
(N
: Node_Id
) return Boolean;
227 -- N is a generic package instantiation node, and this routine determines
228 -- if this package spec does in fact have a generic body. If so, then
229 -- True is returned, otherwise False. Note that this is not at all the
230 -- same as checking if the unit requires a body, since it deals with
231 -- the case of optional bodies accurately (i.e. if a body is optional,
232 -- then it looks to see if a body is actually present). Note: this
233 -- function can only do a fully correct job if in generating code mode
234 -- where all bodies have to be present. If we are operating in semantics
235 -- check only mode, then in some cases of optional bodies, a result of
236 -- False may incorrectly be given. In practice this simply means that
237 -- some cases of warnings for incorrect order of elaboration will only
238 -- be given when generating code, which is not a big problem (and is
239 -- inevitable, given the optional body semantics of Ada).
241 procedure Insert_Elab_Check
(N
: Node_Id
; C
: Node_Id
:= Empty
);
242 -- Given code for an elaboration check (or unconditional raise if
243 -- the check is not needed), inserts the code in the appropriate
244 -- place. N is the call or instantiation node for which the check
245 -- code is required. C is the test whose failure triggers the raise.
247 procedure Output_Calls
(N
: Node_Id
);
248 -- Outputs chain of calls stored in the Elab_Call table. The caller
249 -- has already generated the main warning message, so the warnings
250 -- generated are all continuation messages. The argument is the
251 -- call node at which the messages are to be placed.
253 function Same_Elaboration_Scope
(Scop1
, Scop2
: Entity_Id
) return Boolean;
254 -- Given two scopes, determine whether they are the same scope from an
255 -- elaboration point of view, i.e. packages and blocks are ignored.
257 procedure Set_C_Scope
;
258 -- On entry C_Scope is set to some scope. On return, C_Scope is reset
259 -- to be the enclosing compilation unit of this scope.
261 function Spec_Entity
(E
: Entity_Id
) return Entity_Id
;
262 -- Given a compilation unit entity, if it is a spec entity, it is
263 -- returned unchanged. If it is a body entity, then the spec for
264 -- the corresponding spec is returned
266 procedure Supply_Bodies
(N
: Node_Id
);
267 -- Given a node, N, that is either a subprogram declaration or a package
268 -- declaration, this procedure supplies dummy bodies for the subprogram
269 -- or for all subprograms in the package. If the given node is not one
270 -- of these two possibilities, then Supply_Bodies does nothing. The
271 -- dummy body is supplied by setting the subprogram to be Imported with
272 -- convention Stubbed.
274 procedure Supply_Bodies
(L
: List_Id
);
275 -- Calls Supply_Bodies for all elements of the given list L.
277 function Within
(E1
, E2
: Entity_Id
) return Boolean;
278 -- Given two scopes E1 and E2, returns True if E1 is equal to E2, or
279 -- is one of its contained scopes, False otherwise.
281 function Within_Elaborate_All
(E
: Entity_Id
) return Boolean;
282 -- Before emitting a warning on a scope E for a missing elaborate_all,
283 -- check whether E may be in the context of a directly visible unit
284 -- U to which the pragma applies. This prevents spurious warnings when
285 -- the called entity is renamed within U.
291 procedure Check_A_Call
294 Outer_Scope
: Entity_Id
;
295 Inter_Unit_Only
: Boolean;
296 Generate_Warnings
: Boolean := True)
298 Loc
: constant Source_Ptr
:= Sloc
(N
);
303 -- Top level scope of entity for called subprogram
305 Body_Acts_As_Spec
: Boolean;
306 -- Set to true if call is to body acting as spec (no separate spec)
308 Inst_Case
: constant Boolean := Nkind
(N
) in N_Generic_Instantiation
;
309 -- Indicates if we have instantiation case
311 Caller_Unit_Internal
: Boolean;
312 Callee_Unit_Internal
: Boolean;
314 Inst_Caller
: Source_Ptr
;
315 Inst_Callee
: Source_Ptr
;
317 Unit_Caller
: Unit_Number_Type
;
318 Unit_Callee
: Unit_Number_Type
;
320 Cunit_SW
: Boolean := False;
321 -- Set to suppress warnings for case of external reference where
322 -- one of the enclosing scopes has the Suppress_Elaboration_Warnings
323 -- flag set. For the internal case, we ignore this flag.
325 Cunit_SC
: Boolean := False;
326 -- Set to suppress dynamic elaboration checks where one of the
327 -- enclosing scopes has Suppress_Elaboration_Checks set. For
328 -- the internal case, we ignore this flag.
331 -- Go to parent for derived subprogram, or to original subprogram
332 -- in the case of a renaming (Alias covers both these cases)
336 if Suppress_Elaboration_Warnings
(Ent
) then
340 -- Nothing to do for imported entities,
342 if Is_Imported
(Ent
) then
346 exit when Inst_Case
or else No
(Alias
(Ent
));
350 Decl
:= Unit_Declaration_Node
(Ent
);
352 if Nkind
(Decl
) = N_Subprogram_Body
then
353 Body_Acts_As_Spec
:= True;
355 elsif Nkind
(Decl
) = N_Subprogram_Declaration
356 or else Nkind
(Decl
) = N_Subprogram_Body_Stub
359 Body_Acts_As_Spec
:= False;
361 -- If we have none of an instantiation, subprogram body or
362 -- subprogram declaration, then it is not a case that we want
363 -- to check. (One case is a call to a generic formal subprogram,
364 -- where we do not want the check in the template).
372 if Suppress_Elaboration_Warnings
(E_Scope
) then
376 if Suppress_Elaboration_Checks
(E_Scope
) then
380 -- Exit when we get to compilation unit, not counting subunits
382 exit when Is_Compilation_Unit
(E_Scope
)
383 and then (Is_Child_Unit
(E_Scope
)
384 or else Scope
(E_Scope
) = Standard_Standard
);
386 -- If we did not find a compilation unit, other than standard,
387 -- then nothing to check (happens in some instantiation cases)
389 if E_Scope
= Standard_Standard
then
392 -- Otherwise move up a scope looking for compilation unit
395 E_Scope
:= Scope
(E_Scope
);
399 -- No checks needed for pure or preelaborated compilation units
402 or else Is_Preelaborated
(E_Scope
)
407 -- If the generic entity is within a deeper instance than we are, then
408 -- either the instantiation to which we refer itself caused an ABE, in
409 -- which case that will be handled separately. Otherwise, we know that
410 -- the body we need appears as needed at the point of the instantiation.
411 -- However, this assumption is only valid if we are in static mode.
413 if not Dynamic_Elaboration_Checks
414 and then Instantiation_Depth
(Sloc
(Ent
)) >
415 Instantiation_Depth
(Sloc
(N
))
420 -- Do not give a warning for a package with no body
422 if Ekind
(Ent
) = E_Generic_Package
423 and then not Has_Generic_Body
(N
)
428 -- Case of entity is not in current unit (i.e. with'ed unit case)
430 if E_Scope
/= C_Scope
then
432 -- We are only interested in such calls if the outer call was from
433 -- elaboration code, or if we are in Dynamic_Elaboration_Checks mode.
435 if not From_Elab_Code
and then not Dynamic_Elaboration_Checks
then
439 -- Nothing to do if some scope said to ignore warnings
445 -- Nothing to do for a generic instance, because in this case
446 -- the checking was at the point of instantiation of the generic
447 -- However, this shortcut is only applicable in static mode.
449 if Is_Generic_Instance
(Ent
) and not Dynamic_Elaboration_Checks
then
453 -- Nothing to do if subprogram with no separate spec
455 if Body_Acts_As_Spec
then
459 -- Check cases of internal units
461 Callee_Unit_Internal
:=
462 Is_Internal_File_Name
463 (Unit_File_Name
(Get_Source_Unit
(E_Scope
)));
465 -- Do not give a warning if the with'ed unit is internal
466 -- and this is the generic instantiation case (this saves a
467 -- lot of hassle dealing with the Text_IO special child units)
469 if Callee_Unit_Internal
and Inst_Case
then
473 if C_Scope
= Standard_Standard
then
474 Caller_Unit_Internal
:= False;
476 Caller_Unit_Internal
:=
477 Is_Internal_File_Name
478 (Unit_File_Name
(Get_Source_Unit
(C_Scope
)));
481 -- Do not give a warning if the with'ed unit is internal
482 -- and the caller is not internal (since the binder always
483 -- elaborates internal units first).
485 if Callee_Unit_Internal
and (not Caller_Unit_Internal
) then
489 -- For now, if debug flag -gnatdE is not set, do no checking for
490 -- one internal unit withing another. This fixes the problem with
491 -- the sgi build and storage errors. To be resolved later ???
493 if (Callee_Unit_Internal
and Caller_Unit_Internal
)
494 and then not Debug_Flag_EE
501 -- If the call is in an instance, and the called entity is not
502 -- defined in the same instance, then the elaboration issue
503 -- focuses around the unit containing the template, it is
504 -- this unit which requires an Elaborate_All.
506 -- However, if we are doing dynamic elaboration, we need to
507 -- chase the call in the usual manner.
509 -- We do not handle the case of calling a generic formal correctly
510 -- in the static case. See test 4703-004 to explore this gap ???
512 Inst_Caller
:= Instantiation
(Get_Source_File_Index
(Sloc
(N
)));
513 Inst_Callee
:= Instantiation
(Get_Source_File_Index
(Sloc
(Ent
)));
515 if Inst_Caller
= No_Location
then
516 Unit_Caller
:= No_Unit
;
518 Unit_Caller
:= Get_Source_Unit
(N
);
521 if Inst_Callee
= No_Location
then
522 Unit_Callee
:= No_Unit
;
524 Unit_Callee
:= Get_Source_Unit
(Ent
);
527 if Unit_Caller
/= No_Unit
528 and then Unit_Callee
/= Unit_Caller
529 and then not Dynamic_Elaboration_Checks
531 E_Scope
:= Spec_Entity
(Cunit_Entity
(Unit_Caller
));
533 -- If we don't get a spec entity, just ignore call. Not
534 -- quite clear why this check is necessary.
540 -- Otherwise step to enclosing compilation unit
542 while not Is_Compilation_Unit
(E_Scope
) loop
543 E_Scope
:= Scope
(E_Scope
);
546 -- For the case N is not an instance, or a call within instance
547 -- We recompute E_Scope for the error message, since we
548 -- do NOT want to go to the unit which has the ultimate
549 -- declaration in the case of renaming and derivation and
550 -- we also want to go to the generic unit in the case of
551 -- an instance, and no further.
554 -- Loop to carefully follow renamings and derivations
555 -- one step outside the current unit, but not further.
558 and then Present
(Alias
(Ent
))
560 E_Scope
:= Alias
(Ent
);
566 while not Is_Compilation_Unit
(E_Scope
) loop
567 E_Scope
:= Scope
(E_Scope
);
570 -- If E_Scope is the same as C_Scope, it means that there
571 -- definitely was a local renaming or derivation, and we
572 -- are not yet out of the current unit.
574 exit when E_Scope
/= C_Scope
;
580 if Within_Elaborate_All
(E_Scope
) then
584 if not Suppress_Elaboration_Warnings
(Ent
)
585 and then not Suppress_Elaboration_Warnings
(E_Scope
)
586 and then Elab_Warnings
587 and then Generate_Warnings
589 Warn_On_Instance
:= True;
593 ("instantiation of& may raise Program_Error?", N
, Ent
);
596 ("call to & may raise Program_Error?", N
, Ent
);
598 if Unit_Callee
= No_Unit
599 and then E_Scope
= Current_Scope
601 -- The missing pragma cannot be on the current unit, so
602 -- place it on the compilation unit that contains the
603 -- called entity, which is more likely to be right.
607 while not Is_Compilation_Unit
(E_Scope
) loop
608 E_Scope
:= Scope
(E_Scope
);
613 Error_Msg_Qual_Level
:= Nat
'Last;
615 ("\missing pragma Elaborate_All for&?", N
, E_Scope
);
616 Error_Msg_Qual_Level
:= 0;
618 Warn_On_Instance
:= False;
620 -- Set flag to prevent further warnings for same unit
621 -- unless in All_Errors_Mode.
623 if not All_Errors_Mode
and not Dynamic_Elaboration_Checks
then
624 Set_Suppress_Elaboration_Warnings
(E_Scope
);
628 -- Check for runtime elaboration check required
630 if Dynamic_Elaboration_Checks
then
631 if not Elaboration_Checks_Suppressed
(Ent
)
632 and then not Suppress_Elaboration_Checks
(E_Scope
)
633 and then not Cunit_SC
635 -- Runtime elaboration check required. generate check of the
636 -- elaboration Boolean for the unit containing the entity.
638 Insert_Elab_Check
(N
,
639 Make_Attribute_Reference
(Loc
,
640 Attribute_Name
=> Name_Elaborated
,
643 (Spec_Entity
(E_Scope
), Loc
)));
646 -- If no dynamic check required, then ask binder to guarantee
647 -- that the necessary elaborations will be done properly!
650 if not Suppress_Elaboration_Warnings
(E
)
651 and then not Suppress_Elaboration_Warnings
(E_Scope
)
652 and then Elab_Warnings
653 and then Generate_Warnings
654 and then not Inst_Case
656 Error_Msg_Node_2
:= E_Scope
;
657 Error_Msg_NE
("call to& in elaboration code " &
658 "requires pragma Elaborate_All on&?", N
, E
);
661 Set_Elaborate_All_Desirable
(E_Scope
);
662 Set_Suppress_Elaboration_Warnings
(E_Scope
);
665 -- Case of entity is in same unit as call or instantiation
667 elsif not Inter_Unit_Only
then
668 Check_Internal_Call
(N
, Ent
, Outer_Scope
, E
);
673 -----------------------------
674 -- Check_Bad_Instantiation --
675 -----------------------------
677 procedure Check_Bad_Instantiation
(N
: Node_Id
) is
682 -- Nothing to do if we do not have an instantiation (happens in some
683 -- error cases, and also in the formal package declaration case)
685 if Nkind
(N
) not in N_Generic_Instantiation
then
688 -- Nothing to do if serious errors detected (avoid cascaded errors)
690 elsif Serious_Errors_Detected
/= 0 then
693 -- Nothing to do if not in full analysis mode
695 elsif not Full_Analysis
then
698 -- Nothing to do if inside a generic template
700 elsif Inside_A_Generic
then
703 -- Nothing to do if a library level instantiation
705 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
708 -- Nothing to do if we are compiling a proper body for semantic
709 -- purposes only. The generic body may be in another proper body.
712 Nkind
(Parent
(Unit_Declaration_Node
(Main_Unit_Entity
))) = N_Subunit
718 Ent
:= Get_Generic_Entity
(N
);
720 -- The case we are interested in is when the generic spec is in the
721 -- current declarative part
723 if not Same_Elaboration_Scope
(Current_Scope
, Scope
(Ent
))
724 or else not In_Same_Extended_Unit
(Sloc
(N
), Sloc
(Ent
))
729 -- If the generic entity is within a deeper instance than we are, then
730 -- either the instantiation to which we refer itself caused an ABE, in
731 -- which case that will be handled separately. Otherwise, we know that
732 -- the body we need appears as needed at the point of the instantiation.
733 -- If they are both at the same level but not within the same instance
734 -- then the body of the generic will be in the earlier instance.
737 D1
: constant Int
:= Instantiation_Depth
(Sloc
(Ent
));
738 D2
: constant Int
:= Instantiation_Depth
(Sloc
(N
));
745 and then Is_Generic_Instance
(Scope
(Ent
))
746 and then not In_Open_Scopes
(Scope
(Ent
))
752 -- Now we can proceed, if the entity being called has a completion,
753 -- then we are definitely OK, since we have already seen the body.
755 if Has_Completion
(Ent
) then
759 -- If there is no body, then nothing to do
761 if not Has_Generic_Body
(N
) then
765 -- Here we definitely have a bad instantiation
768 ("?cannot instantiate& before body seen", N
, Ent
);
770 if Present
(Instance_Spec
(N
)) then
771 Supply_Bodies
(Instance_Spec
(N
));
775 ("\?Program_Error will be raised at run time", N
);
776 Insert_Elab_Check
(N
);
777 Set_ABE_Is_Certain
(N
);
779 end Check_Bad_Instantiation
;
781 ---------------------
782 -- Check_Elab_Call --
783 ---------------------
785 procedure Check_Elab_Call
787 Outer_Scope
: Entity_Id
:= Empty
)
794 -- For an entry call, check relevant restriction
796 if Nkind
(N
) = N_Entry_Call_Statement
797 and then not In_Subprogram_Or_Concurrent_Unit
799 Check_Restriction
(No_Entry_Calls_In_Elaboration_Code
, N
);
801 -- Nothing to do if this is not a call (happens in some error
802 -- conditions, and in some cases where rewriting occurs).
804 elsif Nkind
(N
) /= N_Function_Call
805 and then Nkind
(N
) /= N_Procedure_Call_Statement
809 -- Nothing to do if this is a call already rewritten for elab checking.
811 elsif Nkind
(Parent
(N
)) = N_Conditional_Expression
then
814 -- Nothing to do if inside a generic template
816 elsif Inside_A_Generic
817 and then not Present
(Enclosing_Generic_Body
(N
))
822 -- Here we have a call at elaboration time which must be checked
824 if Debug_Flag_LL
then
825 Write_Str
(" Check_Elab_Call: ");
828 or else not Is_Entity_Name
(Name
(N
))
830 Write_Str
("<<not entity name>> ");
832 Write_Name
(Chars
(Entity
(Name
(N
))));
835 Write_Str
(" call at ");
836 Write_Location
(Sloc
(N
));
840 -- Climb up the tree to make sure we are not inside a
841 -- default expression of a parameter specification or
842 -- a record component, since in both these cases, we
843 -- will be doing the actual call later, not now, and it
844 -- is at the time of the actual call (statically speaking)
845 -- that we must do our static check, not at the time of
846 -- its initial analysis).
849 while Present
(P
) loop
850 if Nkind
(P
) = N_Parameter_Specification
852 Nkind
(P
) = N_Component_Declaration
860 -- Stuff that happens only at the outer level
862 if No
(Outer_Scope
) then
863 Elab_Visited
.Set_Last
(0);
865 -- Nothing to do if current scope is Standard (this is a bit
866 -- odd, but it happens in the case of generic instantiations).
868 C_Scope
:= Current_Scope
;
870 if C_Scope
= Standard_Standard
then
874 -- First case, we are in elaboration code
876 From_Elab_Code
:= not In_Subprogram_Or_Concurrent_Unit
;
878 if From_Elab_Code
then
880 -- Complain if call that comes from source in preelaborated
881 -- unit and we are not inside a subprogram (i.e. we are in
884 if Comes_From_Source
(N
)
885 and then In_Preelaborated_Unit
886 and then not In_Inlined_Body
889 ("non-static call not allowed in preelaborated unit", N
);
893 -- Second case, we are inside a subprogram or concurrent unit
894 -- i.e, we are not in elaboration code.
897 -- In this case, the issue is whether we are inside the
898 -- declarative part of the unit in which we live, or inside
899 -- its statements. In the latter case, there is no issue of
900 -- ABE calls at this level (a call from outside to the unit
901 -- in which we live might cause an ABE, but that will be
902 -- detected when we analyze that outer level call, as it
903 -- recurses into the called unit).
905 -- Climb up the tree, doing this test, and also testing
906 -- for being inside a default expression, which, as
907 -- discussed above, is not checked at this stage.
916 -- If we find a parentless subtree, it seems safe to
917 -- assume that we are not in a declarative part and
918 -- that no checking is required.
924 if Is_List_Member
(P
) then
925 L
:= List_Containing
(P
);
932 exit when Nkind
(P
) = N_Subunit
;
934 -- Filter out case of default expressions, where
935 -- we do not do the check at this stage.
937 if Nkind
(P
) = N_Parameter_Specification
939 Nkind
(P
) = N_Component_Declaration
944 if Nkind
(P
) = N_Subprogram_Body
946 Nkind
(P
) = N_Protected_Body
948 Nkind
(P
) = N_Task_Body
950 Nkind
(P
) = N_Block_Statement
952 if L
= Declarations
(P
) then
955 -- We are not in elaboration code, but we are doing
956 -- dynamic elaboration checks, in this case, we still
957 -- need to do the call, since the subprogram we are in
958 -- could be called from another unit, also in dynamic
959 -- elaboration check mode, at elaboration time.
961 elsif Dynamic_Elaboration_Checks
then
963 -- This is a rather new check, going into version
964 -- 3.14a1 for the first time (V1.80 of this unit),
965 -- so we provide a debug flag to enable it. That
966 -- way we have an easy work around for regressions
967 -- that are caused by this new check. This debug
968 -- flag can be removed later.
970 if Debug_Flag_DD
then
974 -- Do the check in this case
978 -- Static model, call is not in elaboration code, we
979 -- never need to worry, because in the static model
980 -- the top level caller always takes care of things.
991 -- Retrieve called entity. If this is a call to a protected subprogram,
992 -- the entity is a selected component.
993 -- The callable entity may be absent, in which case there is nothing
994 -- to do. This happens with non-analyzed calls in nested generics.
1001 elsif Nkind
(Nam
) = N_Selected_Component
then
1002 Ent
:= Entity
(Selector_Name
(Nam
));
1004 elsif not Is_Entity_Name
(Nam
) then
1008 Ent
:= Entity
(Nam
);
1015 -- Nothing to do if this is a recursive call (i.e. a call to
1016 -- an entity that is already in the Elab_Call stack)
1018 for J
in 1 .. Elab_Visited
.Last
loop
1019 if Ent
= Elab_Visited
.Table
(J
) then
1024 -- See if we need to analyze this call. We analyze it if either of
1025 -- the following conditions is met:
1027 -- It is an inner level call (since in this case it was triggered
1028 -- by an outer level call from elaboration code), but only if the
1029 -- call is within the scope of the original outer level call.
1031 -- It is an outer level call from elaboration code, or the called
1032 -- entity is in the same elaboration scope.
1034 -- And in these cases, we will check both inter-unit calls and
1035 -- intra-unit (within a single unit) calls.
1037 C_Scope
:= Current_Scope
;
1039 -- If not outer level call, then we follow it if it is within
1040 -- the original scope of the outer call.
1042 if Present
(Outer_Scope
)
1043 and then Within
(Scope
(Ent
), Outer_Scope
)
1046 Check_A_Call
(N
, Ent
, Outer_Scope
, Inter_Unit_Only
=> False);
1048 elsif Elaboration_Checks_Suppressed
(Current_Scope
) then
1051 elsif From_Elab_Code
then
1053 Check_A_Call
(N
, Ent
, Standard_Standard
, Inter_Unit_Only
=> False);
1055 elsif Same_Elaboration_Scope
(C_Scope
, Scope
(Ent
)) then
1057 Check_A_Call
(N
, Ent
, Scope
(Ent
), Inter_Unit_Only
=> False);
1059 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode
1060 -- is set, then we will do the check, but only in the inter-unit case
1061 -- (this is to accommodate unguarded elaboration calls from other units
1062 -- in which this same mode is set). We don't want warnings in this case,
1063 -- it would generate warnings having nothing to do with elaboration.
1065 elsif Dynamic_Elaboration_Checks
then
1071 Inter_Unit_Only
=> True,
1072 Generate_Warnings
=> False);
1077 end Check_Elab_Call
;
1079 ----------------------
1080 -- Check_Elab_Calls --
1081 ----------------------
1083 procedure Check_Elab_Calls
is
1085 -- If expansion is disabled, do not generate any checks. Also
1086 -- skip checks if any subunits are missing because in either
1087 -- case we lack the full information that we need, and no object
1088 -- file will be created in any case.
1090 if not Expander_Active
or else Subunits_Missing
then
1094 -- Skip delayed calls if we had any errors
1096 if Serious_Errors_Detected
= 0 then
1097 Delaying_Elab_Checks
:= False;
1098 Expander_Mode_Save_And_Set
(True);
1100 for J
in Delay_Check
.First
.. Delay_Check
.Last
loop
1101 New_Scope
(Delay_Check
.Table
(J
).Curscop
);
1102 From_Elab_Code
:= Delay_Check
.Table
(J
).From_Elab_Code
;
1104 Check_Internal_Call_Continue
(
1105 N
=> Delay_Check
.Table
(J
).N
,
1106 E
=> Delay_Check
.Table
(J
).E
,
1107 Outer_Scope
=> Delay_Check
.Table
(J
).Outer_Scope
,
1108 Orig_Ent
=> Delay_Check
.Table
(J
).Orig_Ent
);
1113 -- Set Delaying_Elab_Checks back on for next main compilation
1115 Expander_Mode_Restore
;
1116 Delaying_Elab_Checks
:= True;
1118 end Check_Elab_Calls
;
1120 ------------------------------
1121 -- Check_Elab_Instantiation --
1122 ------------------------------
1124 procedure Check_Elab_Instantiation
1126 Outer_Scope
: Entity_Id
:= Empty
)
1132 -- Check for and deal with bad instantiation case. There is some
1133 -- duplicated code here, but we will worry about this later ???
1135 Check_Bad_Instantiation
(N
);
1137 if ABE_Is_Certain
(N
) then
1141 -- Nothing to do if we do not have an instantiation (happens in some
1142 -- error cases, and also in the formal package declaration case)
1144 if Nkind
(N
) not in N_Generic_Instantiation
then
1148 -- Nothing to do if inside a generic template
1150 if Inside_A_Generic
then
1155 Ent
:= Get_Generic_Entity
(N
);
1156 From_Elab_Code
:= not In_Subprogram_Or_Concurrent_Unit
;
1158 -- See if we need to analyze this instantiation. We analyze it if
1159 -- either of the following conditions is met:
1161 -- It is an inner level instantiation (since in this case it was
1162 -- triggered by an outer level call from elaboration code), but
1163 -- only if the instantiation is within the scope of the original
1164 -- outer level call.
1166 -- It is an outer level instantiation from elaboration code, or the
1167 -- instantiated entity is in the same elaboratoin scope.
1169 -- And in these cases, we will check both the inter-unit case and
1170 -- the intra-unit (within a single unit) case.
1172 C_Scope
:= Current_Scope
;
1174 if Present
(Outer_Scope
)
1175 and then Within
(Scope
(Ent
), Outer_Scope
)
1178 Check_A_Call
(N
, Ent
, Outer_Scope
, Inter_Unit_Only
=> False);
1180 elsif From_Elab_Code
then
1182 Check_A_Call
(N
, Ent
, Standard_Standard
, Inter_Unit_Only
=> False);
1184 elsif Same_Elaboration_Scope
(C_Scope
, Scope
(Ent
)) then
1186 Check_A_Call
(N
, Ent
, Scope
(Ent
), Inter_Unit_Only
=> False);
1188 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode
1189 -- is set, then we will do the check, but only in the inter-unit case
1190 -- (this is to accommodate unguarded elaboration calls from other units
1191 -- in which this same mode is set). We inhibit warnings in this case,
1192 -- since this instantiation is not occurring in elaboration code.
1194 elsif Dynamic_Elaboration_Checks
then
1200 Inter_Unit_Only
=> True,
1201 Generate_Warnings
=> False);
1206 end Check_Elab_Instantiation
;
1208 -------------------------
1209 -- Check_Internal_Call --
1210 -------------------------
1212 procedure Check_Internal_Call
1215 Outer_Scope
: Entity_Id
;
1216 Orig_Ent
: Entity_Id
)
1218 Inst_Case
: constant Boolean := Nkind
(N
) in N_Generic_Instantiation
;
1221 -- If not function or procedure call or instantiation, then ignore
1222 -- call (this happens in some error case and rewriting cases)
1224 if Nkind
(N
) /= N_Function_Call
1226 Nkind
(N
) /= N_Procedure_Call_Statement
1232 -- Nothing to do if this is a call or instantiation that has
1233 -- already been found to be a sure ABE
1235 elsif ABE_Is_Certain
(N
) then
1238 -- Nothing to do if errors already detected (avoid cascaded errors)
1240 elsif Serious_Errors_Detected
/= 0 then
1243 -- Nothing to do if not in full analysis mode
1245 elsif not Full_Analysis
then
1248 -- Nothing to do if within a default expression, since the call
1249 -- is not actualy being made at this time.
1251 elsif In_Default_Expression
then
1254 -- Nothing to do for call to intrinsic subprogram
1256 elsif Is_Intrinsic_Subprogram
(E
) then
1259 -- No need to trace local calls if checking task activation, because
1260 -- other local bodies are elaborated already.
1262 elsif In_Task_Activation
then
1266 -- Delay this call if we are still delaying calls
1268 if Delaying_Elab_Checks
then
1269 Delay_Check
.Increment_Last
;
1270 Delay_Check
.Table
(Delay_Check
.Last
) :=
1273 Orig_Ent
=> Orig_Ent
,
1274 Curscop
=> Current_Scope
,
1275 Outer_Scope
=> Outer_Scope
,
1276 From_Elab_Code
=> From_Elab_Code
);
1279 -- Otherwise, call phase 2 continuation right now
1282 Check_Internal_Call_Continue
(N
, E
, Outer_Scope
, Orig_Ent
);
1285 end Check_Internal_Call
;
1287 ----------------------------------
1288 -- Check_Internal_Call_Continue --
1289 ----------------------------------
1291 procedure Check_Internal_Call_Continue
1294 Outer_Scope
: Entity_Id
;
1295 Orig_Ent
: Entity_Id
)
1297 Loc
: constant Source_Ptr
:= Sloc
(N
);
1298 Inst_Case
: constant Boolean := Is_Generic_Unit
(E
);
1303 function Process
(N
: Node_Id
) return Traverse_Result
;
1304 -- Function applied to each node as we traverse the body.
1305 -- Checks for call that needs checking, and if so checks
1306 -- it. Always returns OK, so entire tree is traversed.
1308 function Process
(N
: Node_Id
) return Traverse_Result
is
1310 -- If user has specified that there are no entry calls in elaboration
1311 -- code, do not trace past an accept statement, because the rendez-
1312 -- vous will happen after elaboration.
1314 if (Nkind
(Original_Node
(N
)) = N_Accept_Statement
1315 or else Nkind
(Original_Node
(N
)) = N_Selective_Accept
)
1316 and then Restrictions
(No_Entry_Calls_In_Elaboration_Code
)
1320 -- If we have a subprogram call, check it
1322 elsif Nkind
(N
) = N_Function_Call
1323 or else Nkind
(N
) = N_Procedure_Call_Statement
1325 Check_Elab_Call
(N
, Outer_Scope
);
1328 -- If we have a generic instantiation, check it
1330 elsif Nkind
(N
) in N_Generic_Instantiation
then
1331 Check_Elab_Instantiation
(N
, Outer_Scope
);
1334 -- Skip subprogram bodies that come from source (wait for
1335 -- call to analyze these). The reason for the come from
1336 -- source test is to avoid catching task bodies.
1338 -- For task bodies, we should really avoid these too, waiting
1339 -- for the task activation, but that's too much trouble to
1340 -- catch for now, so we go in unconditionally. This is not
1341 -- so terrible, it means the error backtrace is not quite
1342 -- complete, and we are too eager to scan bodies of tasks
1343 -- that are unused, but this is hardly very significant!
1345 elsif Nkind
(N
) = N_Subprogram_Body
1346 and then Comes_From_Source
(N
)
1355 procedure Traverse
is new Atree
.Traverse_Proc
;
1356 -- Traverse procedure using above Process function
1358 -- Start of processing for Check_Internal_Call_Continue
1361 -- Save outer level call if at outer level
1363 if Elab_Call
.Last
= 0 then
1364 Outer_Level_Sloc
:= Loc
;
1367 Elab_Visited
.Increment_Last
;
1368 Elab_Visited
.Table
(Elab_Visited
.Last
) := E
;
1370 -- If the call is to a function that renames a literal, no check
1373 if Ekind
(E
) = E_Enumeration_Literal
then
1377 Sbody
:= Unit_Declaration_Node
(E
);
1379 if Nkind
(Sbody
) /= N_Subprogram_Body
1381 Nkind
(Sbody
) /= N_Package_Body
1383 Ebody
:= Corresponding_Body
(Sbody
);
1388 Sbody
:= Unit_Declaration_Node
(Ebody
);
1392 -- If the body appears after the outer level call or
1393 -- instantiation then we have an error case handled below.
1395 if Earlier_In_Extended_Unit
(Outer_Level_Sloc
, Sloc
(Sbody
))
1396 and then not In_Task_Activation
1400 -- If we have the instantiation case we are done, since we now
1401 -- know that the body of the generic appeared earlier.
1403 elsif Inst_Case
then
1406 -- Otherwise we have a call, so we trace through the called
1407 -- body to see if it has any problems ..
1410 pragma Assert
(Nkind
(Sbody
) = N_Subprogram_Body
);
1412 Elab_Call
.Increment_Last
;
1413 Elab_Call
.Table
(Elab_Call
.Last
).Cloc
:= Loc
;
1414 Elab_Call
.Table
(Elab_Call
.Last
).Ent
:= E
;
1416 if Debug_Flag_LL
then
1417 Write_Str
("Elab_Call.Last = ");
1418 Write_Int
(Int
(Elab_Call
.Last
));
1419 Write_Str
(" Ent = ");
1420 Write_Name
(Chars
(E
));
1422 Write_Location
(Sloc
(N
));
1426 -- Now traverse declarations and statements of subprogram body.
1427 -- Note that we cannot simply Traverse (Sbody), since traverse
1428 -- does not normally visit subprogram bodies.
1431 Decl
: Node_Id
:= First
(Declarations
(Sbody
));
1434 while Present
(Decl
) loop
1440 Traverse
(Handled_Statement_Sequence
(Sbody
));
1442 Elab_Call
.Decrement_Last
;
1446 -- Here is the case of calling a subprogram where the body has
1447 -- not yet been encountered, a warning message is needed.
1449 Warn_On_Instance
:= True;
1451 -- If we have nothing in the call stack, then this is at the
1452 -- outer level, and the ABE is bound to occur.
1454 if Elab_Call
.Last
= 0 then
1458 ("?cannot instantiate& before body seen", N
, Orig_Ent
);
1461 ("?cannot call& before body seen", N
, Orig_Ent
);
1465 ("\?Program_Error will be raised at run time", N
);
1466 Insert_Elab_Check
(N
);
1468 -- Call is not at outer level
1471 -- Deal with dynamic elaboration check
1473 if not Elaboration_Checks_Suppressed
(E
) then
1474 Set_Elaboration_Entity_Required
(E
);
1476 -- Case of no elaboration entity allocated yet
1478 if No
(Elaboration_Entity
(E
)) then
1480 -- Create object declaration for elaboration entity, and put it
1481 -- just in front of the spec of the subprogram or generic unit,
1482 -- in the same scope as this unit.
1485 Loce
: constant Source_Ptr
:= Sloc
(E
);
1486 Ent
: constant Entity_Id
:=
1487 Make_Defining_Identifier
(Loc
,
1488 Chars
=> New_External_Name
(Chars
(E
), 'E'));
1491 Set_Elaboration_Entity
(E
, Ent
);
1492 New_Scope
(Scope
(E
));
1494 Insert_Action
(Declaration_Node
(E
),
1495 Make_Object_Declaration
(Loce
,
1496 Defining_Identifier
=> Ent
,
1497 Object_Definition
=>
1498 New_Occurrence_Of
(Standard_Boolean
, Loce
),
1499 Expression
=> New_Occurrence_Of
(Standard_False
, Loce
)));
1501 -- Set elaboration flag at the point of the body
1503 Set_Elaboration_Flag
(Sbody
, E
);
1509 -- Generate check of the elaboration Boolean
1511 Insert_Elab_Check
(N
,
1512 New_Occurrence_Of
(Elaboration_Entity
(E
), Loc
));
1515 -- Generate the warning
1517 if not Suppress_Elaboration_Warnings
(E
) then
1520 ("instantiation of& may occur before body is seen?",
1524 ("call to& may occur before body is seen?", N
, Orig_Ent
);
1528 ("\Program_Error may be raised at run time?", N
);
1534 Warn_On_Instance
:= False;
1536 -- Set flag to suppress further warnings on same subprogram
1537 -- unless in all errors mode
1539 if not All_Errors_Mode
then
1540 Set_Suppress_Elaboration_Warnings
(E
);
1542 end Check_Internal_Call_Continue
;
1544 ----------------------------
1545 -- Check_Task_Activation --
1546 ----------------------------
1548 procedure Check_Task_Activation
(N
: Node_Id
) is
1549 Loc
: constant Source_Ptr
:= Sloc
(N
);
1552 Task_Scope
: Entity_Id
;
1553 Cunit_SC
: Boolean := False;
1556 Inter_Procs
: Elist_Id
:= New_Elmt_List
;
1557 Intra_Procs
: Elist_Id
:= New_Elmt_List
;
1558 Enclosing
: Entity_Id
;
1560 procedure Add_Task_Proc
(Typ
: Entity_Id
);
1561 -- Add to Task_Procs the task body procedure(s) of task types in Typ.
1562 -- For record types, this procedure recurses over component types.
1564 procedure Collect_Tasks
(Decls
: List_Id
);
1565 -- Collect the types of the tasks that are to be activated in the given
1566 -- list of declarations, in order to perform elaboration checks on the
1567 -- corresponding task procedures which are called implicitly here.
1569 function Outer_Unit
(E
: Entity_Id
) return Entity_Id
;
1570 -- find enclosing compilation unit of Entity, ignoring subunits, or
1571 -- else enclosing subprogram. If E is not a package, there is no need
1572 -- for inter-unit elaboration checks.
1578 procedure Add_Task_Proc
(Typ
: Entity_Id
) is
1580 Proc
: Entity_Id
:= Empty
;
1583 if Is_Task_Type
(Typ
) then
1584 Proc
:= Get_Task_Body_Procedure
(Typ
);
1586 elsif Is_Array_Type
(Typ
)
1587 and then Has_Task
(Base_Type
(Typ
))
1589 Add_Task_Proc
(Component_Type
(Typ
));
1591 elsif Is_Record_Type
(Typ
)
1592 and then Has_Task
(Base_Type
(Typ
))
1594 Comp
:= First_Component
(Typ
);
1596 while Present
(Comp
) loop
1597 Add_Task_Proc
(Etype
(Comp
));
1598 Comp
:= Next_Component
(Comp
);
1602 -- If the task type is another unit, we will perform the usual
1603 -- elaboration check on its enclosing unit. If the type is in the
1604 -- same unit, we can trace the task body as for an internal call,
1605 -- but we only need to examine other external calls, because at
1606 -- the point the task is activated, internal subprogram bodies
1607 -- will have been elaborated already. We keep separate lists for
1608 -- each kind of task.
1610 -- Skip this test if errors have occurred, since in this case
1611 -- we can get false indications.
1613 if Total_Errors_Detected
/= 0 then
1617 if Present
(Proc
) then
1618 if Outer_Unit
(Scope
(Proc
)) = Enclosing
then
1620 if No
(Corresponding_Body
(Unit_Declaration_Node
(Proc
)))
1622 (not Is_Generic_Instance
(Scope
(Proc
))
1624 Scope
(Proc
) = Scope
(Defining_Identifier
(Decl
)))
1627 ("task will be activated before elaboration of its body?",
1630 ("Program_Error will be raised at run-time?", Decl
);
1633 Present
(Corresponding_Body
(Unit_Declaration_Node
(Proc
)))
1635 Append_Elmt
(Proc
, Intra_Procs
);
1639 Elmt
:= First_Elmt
(Inter_Procs
);
1641 -- No need for multiple entries of the same type.
1643 while Present
(Elmt
) loop
1644 if Node
(Elmt
) = Proc
then
1651 Append_Elmt
(Proc
, Inter_Procs
);
1660 procedure Collect_Tasks
(Decls
: List_Id
) is
1662 if Present
(Decls
) then
1663 Decl
:= First
(Decls
);
1665 while Present
(Decl
) loop
1667 if Nkind
(Decl
) = N_Object_Declaration
1668 and then Has_Task
(Etype
(Defining_Identifier
(Decl
)))
1670 Add_Task_Proc
(Etype
(Defining_Identifier
(Decl
)));
1682 function Outer_Unit
(E
: Entity_Id
) return Entity_Id
is
1683 Outer
: Entity_Id
:= E
;
1686 while Present
(Outer
) loop
1687 if Suppress_Elaboration_Checks
(Outer
) then
1691 exit when Is_Child_Unit
(Outer
)
1692 or else Scope
(Outer
) = Standard_Standard
1693 or else Ekind
(Outer
) /= E_Package
;
1694 Outer
:= Scope
(Outer
);
1700 -- Start of processing for Check_Task_Activation
1703 Enclosing
:= Outer_Unit
(Current_Scope
);
1705 -- Find all tasks declared in the current unit.
1707 if Nkind
(N
) = N_Package_Body
then
1708 P
:= Unit_Declaration_Node
(Corresponding_Spec
(N
));
1710 Collect_Tasks
(Declarations
(N
));
1711 Collect_Tasks
(Visible_Declarations
(Specification
(P
)));
1712 Collect_Tasks
(Private_Declarations
(Specification
(P
)));
1714 elsif Nkind
(N
) = N_Package_Declaration
then
1715 Collect_Tasks
(Visible_Declarations
(Specification
(N
)));
1716 Collect_Tasks
(Private_Declarations
(Specification
(N
)));
1719 Collect_Tasks
(Declarations
(N
));
1722 -- We only perform detailed checks in all tasks are library level
1723 -- entities. If the master is a subprogram or task, activation will
1724 -- depend on the activation of the master itself.
1725 -- Should dynamic checks be added in the more general case???
1727 if Ekind
(Enclosing
) /= E_Package
then
1731 -- For task types defined in other units, we want the unit containing
1732 -- the task body to be elaborated before the current one.
1734 Elmt
:= First_Elmt
(Inter_Procs
);
1736 while Present
(Elmt
) loop
1738 Task_Scope
:= Outer_Unit
(Scope
(Ent
));
1740 if not Is_Compilation_Unit
(Task_Scope
) then
1743 elsif Suppress_Elaboration_Warnings
(Task_Scope
) then
1746 elsif Dynamic_Elaboration_Checks
then
1747 if not Elaboration_Checks_Suppressed
(Ent
)
1748 and then not Cunit_SC
1749 and then not Restrictions
(No_Entry_Calls_In_Elaboration_Code
)
1751 -- Runtime elaboration check required. generate check of the
1752 -- elaboration Boolean for the unit containing the entity.
1754 Insert_Elab_Check
(N
,
1755 Make_Attribute_Reference
(Loc
,
1756 Attribute_Name
=> Name_Elaborated
,
1759 (Spec_Entity
(Task_Scope
), Loc
)));
1763 -- Force the binder to elaborate other unit first.
1765 if not Suppress_Elaboration_Warnings
(Ent
)
1766 and then Elab_Warnings
1767 and then not Suppress_Elaboration_Warnings
(Task_Scope
)
1769 Error_Msg_Node_2
:= Task_Scope
;
1770 Error_Msg_NE
("activation of an instance of task type&" &
1771 " requires pragma Elaborate_All on &?", N
, Ent
);
1774 Set_Elaborate_All_Desirable
(Task_Scope
);
1775 Set_Suppress_Elaboration_Warnings
(Task_Scope
);
1781 -- For tasks declared in the current unit, trace other calls within
1782 -- the task procedure bodies, which are available.
1784 In_Task_Activation
:= True;
1785 Elmt
:= First_Elmt
(Intra_Procs
);
1787 while Present
(Elmt
) loop
1789 Check_Internal_Call_Continue
(N
, Ent
, Enclosing
, Ent
);
1793 In_Task_Activation
:= False;
1794 end Check_Task_Activation
;
1796 ----------------------
1797 -- Has_Generic_Body --
1798 ----------------------
1800 function Has_Generic_Body
(N
: Node_Id
) return Boolean is
1801 Ent
: constant Entity_Id
:= Get_Generic_Entity
(N
);
1802 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Ent
);
1805 function Find_Body_In
(E
: Entity_Id
; N
: Node_Id
) return Node_Id
;
1806 -- Determine if the list of nodes headed by N and linked by Next
1807 -- contains a package body for the package spec entity E, and if
1808 -- so return the package body. If not, then returns Empty.
1810 function Load_Package_Body
(Nam
: Unit_Name_Type
) return Node_Id
;
1811 -- This procedure is called load the unit whose name is given by Nam.
1812 -- This unit is being loaded to see whether it contains an optional
1813 -- generic body. The returned value is the loaded unit, which is
1814 -- always a package body (only package bodies can contain other
1815 -- entities in the sense in which Has_Generic_Body is interested).
1816 -- We only attempt to load bodies if we are generating code. If we
1817 -- are in semantics check only mode, then it would be wrong to load
1818 -- bodies that are not required from a semantic point of view, so
1819 -- in this case we return Empty. The result is that the caller may
1820 -- incorrectly decide that a generic spec does not have a body when
1821 -- in fact it does, but the only harm in this is that some warnings
1822 -- on elaboration problems may be lost in semantic checks only mode,
1823 -- which is not big loss. We also return Empty if we go for a body
1824 -- and it is not there.
1826 function Locate_Corresponding_Body
(PE
: Entity_Id
) return Node_Id
;
1827 -- PE is the entity for a package spec. This function locates the
1828 -- corresponding package body, returning Empty if none is found.
1829 -- The package body returned is fully parsed but may not yet be
1830 -- analyzed, so only syntactic fields should be referenced.
1836 function Find_Body_In
(E
: Entity_Id
; N
: Node_Id
) return Node_Id
is
1841 while Present
(Nod
) loop
1843 -- If we found the package body we are looking for, return it
1845 if Nkind
(Nod
) = N_Package_Body
1846 and then Chars
(Defining_Unit_Name
(Nod
)) = Chars
(E
)
1850 -- If we found the stub for the body, go after the subunit,
1851 -- loading it if necessary.
1853 elsif Nkind
(Nod
) = N_Package_Body_Stub
1854 and then Chars
(Defining_Identifier
(Nod
)) = Chars
(E
)
1856 if Present
(Library_Unit
(Nod
)) then
1857 return Unit
(Library_Unit
(Nod
));
1860 return Load_Package_Body
(Get_Unit_Name
(Nod
));
1863 -- If neither package body nor stub, keep looking on chain
1873 -----------------------
1874 -- Load_Package_Body --
1875 -----------------------
1877 function Load_Package_Body
(Nam
: Unit_Name_Type
) return Node_Id
is
1878 U
: Unit_Number_Type
;
1881 if Operating_Mode
/= Generate_Code
then
1894 return Unit
(Cunit
(U
));
1897 end Load_Package_Body
;
1899 -------------------------------
1900 -- Locate_Corresponding_Body --
1901 -------------------------------
1903 function Locate_Corresponding_Body
(PE
: Entity_Id
) return Node_Id
is
1904 Spec
: constant Node_Id
:= Declaration_Node
(PE
);
1905 Decl
: constant Node_Id
:= Parent
(Spec
);
1906 Scop
: constant Entity_Id
:= Scope
(PE
);
1910 if Is_Library_Level_Entity
(PE
) then
1912 -- If package is a library unit that requires a body, we have
1913 -- no choice but to go after that body because it might contain
1914 -- an optional body for the original generic package.
1916 if Unit_Requires_Body
(PE
) then
1918 -- Load the body. Note that we are a little careful here to
1919 -- use Spec to get the unit number, rather than PE or Decl,
1920 -- since in the case where the package is itself a library
1921 -- level instantiation, Spec will properly reference the
1922 -- generic template, which is what we really want.
1926 (Get_Body_Name
(Unit_Name
(Get_Source_Unit
(Spec
))));
1928 -- But if the package is a library unit that does NOT require
1929 -- a body, then no body is permitted, so we are sure that there
1930 -- is no body for the original generic package.
1936 -- Otherwise look and see if we are embedded in a further package
1938 elsif Is_Package
(Scop
) then
1940 -- If so, get the body of the enclosing package, and look in
1941 -- its package body for the package body we are looking for.
1943 PBody
:= Locate_Corresponding_Body
(Scop
);
1948 return Find_Body_In
(PE
, First
(Declarations
(PBody
)));
1951 -- If we are not embedded in a further package, then the body
1952 -- must be in the same declarative part as we are.
1955 return Find_Body_In
(PE
, Next
(Decl
));
1957 end Locate_Corresponding_Body
;
1959 -- Start of processing for Has_Generic_Body
1962 if Present
(Corresponding_Body
(Decl
)) then
1965 elsif Unit_Requires_Body
(Ent
) then
1968 -- Compilation units cannot have optional bodies
1970 elsif Is_Compilation_Unit
(Ent
) then
1973 -- Otherwise look at what scope we are in
1976 Scop
:= Scope
(Ent
);
1978 -- Case of entity is in other than a package spec, in this case
1979 -- the body, if present, must be in the same declarative part.
1981 if not Is_Package
(Scop
) then
1986 P
:= Declaration_Node
(Ent
);
1988 -- Declaration node may get us a spec, so if so, go to
1989 -- the parent declaration.
1991 while not Is_List_Member
(P
) loop
1995 return Present
(Find_Body_In
(Ent
, Next
(P
)));
1998 -- If the entity is in a package spec, then we have to locate
1999 -- the corresponding package body, and look there.
2003 PBody
: constant Node_Id
:= Locate_Corresponding_Body
(Scop
);
2011 (Find_Body_In
(Ent
, (First
(Declarations
(PBody
)))));
2016 end Has_Generic_Body
;
2018 -----------------------
2019 -- Insert_Elab_Check --
2020 -----------------------
2022 procedure Insert_Elab_Check
(N
: Node_Id
; C
: Node_Id
:= Empty
) is
2024 Loc
: constant Source_Ptr
:= Sloc
(N
);
2027 -- If expansion is disabled, do not generate any checks. Also
2028 -- skip checks if any subunits are missing because in either
2029 -- case we lack the full information that we need, and no object
2030 -- file will be created in any case.
2032 if not Expander_Active
or else Subunits_Missing
then
2036 -- If we have a generic instantiation, where Instance_Spec is set,
2037 -- then this field points to a generic instance spec that has
2038 -- been inserted before the instantiation node itself, so that
2039 -- is where we want to insert a check.
2041 if Nkind
(N
) in N_Generic_Instantiation
2042 and then Present
(Instance_Spec
(N
))
2044 Nod
:= Instance_Spec
(N
);
2049 -- If we are inserting at the top level, insert in Aux_Decls
2051 if Nkind
(Parent
(Nod
)) = N_Compilation_Unit
then
2053 ADN
: constant Node_Id
:= Aux_Decls_Node
(Parent
(Nod
));
2059 Make_Raise_Program_Error
(Loc
,
2060 Reason
=> PE_Access_Before_Elaboration
);
2063 Make_Raise_Program_Error
(Loc
,
2064 Condition
=> Make_Op_Not
(Loc
, C
),
2065 Reason
=> PE_Access_Before_Elaboration
);
2068 if No
(Declarations
(ADN
)) then
2069 Set_Declarations
(ADN
, New_List
(R
));
2071 Append_To
(Declarations
(ADN
), R
);
2077 -- Otherwise just insert before the node in question. However, if
2078 -- the context of the call has already been analyzed, an insertion
2079 -- will not work if it depends on subsequent expansion (e.g. a call in
2080 -- a branch of a short-circuit). In that case we replace the call with
2081 -- a conditional expression, or with a Raise if it is unconditional.
2082 -- Unfortunately this does not work if the call has a dynamic size,
2083 -- because gigi regards it as a dynamic-sized temporary. If such a call
2084 -- appears in a short-circuit expression, the elaboration check will be
2085 -- missed (rare enough ???).
2088 if Nkind
(N
) = N_Function_Call
2089 and then Analyzed
(Parent
(N
))
2090 and then Size_Known_At_Compile_Time
(Etype
(N
))
2093 Typ
: constant Entity_Id
:= Etype
(N
);
2094 Chk
: constant Boolean := Do_Range_Check
(N
);
2096 R
: constant Node_Id
:=
2097 Make_Raise_Program_Error
(Loc
,
2098 Reason
=> PE_Access_Before_Elaboration
);
2108 Make_Conditional_Expression
(Loc
,
2109 Expressions
=> New_List
(C
, Relocate_Node
(N
), R
)));
2112 Analyze_And_Resolve
(N
, Typ
);
2114 -- If the original call requires a range check, so does the
2115 -- conditional expression.
2118 Enable_Range_Check
(N
);
2120 Set_Do_Range_Check
(N
, False);
2127 Make_Raise_Program_Error
(Loc
,
2128 Reason
=> PE_Access_Before_Elaboration
));
2131 Make_Raise_Program_Error
(Loc
,
2135 Reason
=> PE_Access_Before_Elaboration
));
2139 end Insert_Elab_Check
;
2145 procedure Output_Calls
(N
: Node_Id
) is
2148 function Is_Printable_Error_Name
(Nm
: Name_Id
) return Boolean;
2149 -- An internal function, used to determine if a name, Nm, is either
2150 -- a non-internal name, or is an internal name that is printable
2151 -- by the error message circuits (i.e. it has a single upper
2152 -- case letter at the end).
2154 function Is_Printable_Error_Name
(Nm
: Name_Id
) return Boolean is
2156 if not Is_Internal_Name
(Nm
) then
2159 elsif Name_Len
= 1 then
2163 Name_Len
:= Name_Len
- 1;
2164 return not Is_Internal_Name
;
2166 end Is_Printable_Error_Name
;
2168 -- Start of processing for Output_Calls
2171 for J
in reverse 1 .. Elab_Call
.Last
loop
2172 Error_Msg_Sloc
:= Elab_Call
.Table
(J
).Cloc
;
2174 Ent
:= Elab_Call
.Table
(J
).Ent
;
2176 if Is_Generic_Unit
(Ent
) then
2177 Error_Msg_NE
("\?& instantiated #", N
, Ent
);
2179 elsif Chars
(Ent
) = Name_uInit_Proc
then
2180 Error_Msg_N
("\?initialization procedure called #", N
);
2182 elsif Is_Printable_Error_Name
(Chars
(Ent
)) then
2183 Error_Msg_NE
("\?& called #", N
, Ent
);
2186 Error_Msg_N
("\? called #", N
);
2191 ----------------------------
2192 -- Same_Elaboration_Scope --
2193 ----------------------------
2195 function Same_Elaboration_Scope
(Scop1
, Scop2
: Entity_Id
) return Boolean is
2196 S1
: Entity_Id
:= Scop1
;
2197 S2
: Entity_Id
:= Scop2
;
2200 while S1
/= Standard_Standard
2201 and then (Ekind
(S1
) = E_Package
2203 Ekind
(S1
) = E_Block
)
2208 while S2
/= Standard_Standard
2209 and then (Ekind
(S2
) = E_Package
2211 Ekind
(S2
) = E_Protected_Type
2213 Ekind
(S2
) = E_Block
)
2219 end Same_Elaboration_Scope
;
2225 procedure Set_C_Scope
is
2227 while not Is_Compilation_Unit
(C_Scope
) loop
2228 C_Scope
:= Scope
(C_Scope
);
2236 function Spec_Entity
(E
: Entity_Id
) return Entity_Id
is
2240 -- Check for case of body entity
2241 -- Why is the check for E_Void needed???
2243 if Ekind
(E
) = E_Void
2244 or else Ekind
(E
) = E_Subprogram_Body
2245 or else Ekind
(E
) = E_Package_Body
2250 Decl
:= Parent
(Decl
);
2251 exit when Nkind
(Decl
) in N_Proper_Body
;
2254 return Corresponding_Spec
(Decl
);
2265 procedure Supply_Bodies
(N
: Node_Id
) is
2267 if Nkind
(N
) = N_Subprogram_Declaration
then
2269 Ent
: constant Entity_Id
:= Defining_Unit_Name
(Specification
(N
));
2272 Set_Is_Imported
(Ent
);
2273 Set_Convention
(Ent
, Convention_Stubbed
);
2276 elsif Nkind
(N
) = N_Package_Declaration
then
2278 Spec
: constant Node_Id
:= Specification
(N
);
2281 New_Scope
(Defining_Unit_Name
(Spec
));
2282 Supply_Bodies
(Visible_Declarations
(Spec
));
2283 Supply_Bodies
(Private_Declarations
(Spec
));
2289 procedure Supply_Bodies
(L
: List_Id
) is
2295 while Present
(Elmt
) loop
2296 Supply_Bodies
(Elmt
);
2306 function Within
(E1
, E2
: Entity_Id
) return Boolean is
2316 elsif Scop
= Standard_Standard
then
2320 Scop
:= Scope
(Scop
);
2324 raise Program_Error
;
2327 --------------------------
2328 -- Within_Elaborate_All --
2329 --------------------------
2331 function Within_Elaborate_All
(E
: Entity_Id
) return Boolean is
2334 Elab_Id
: Entity_Id
;
2338 Item
:= First
(Context_Items
(Cunit
(Current_Sem_Unit
)));
2340 while Present
(Item
) loop
2341 if Nkind
(Item
) = N_Pragma
2342 and then Get_Pragma_Id
(Chars
(Item
)) = Pragma_Elaborate_All
2346 Expression
(First
(Pragma_Argument_Associations
(Item
))));
2347 Par
:= Parent
(Unit_Declaration_Node
(Elab_Id
));
2348 Item2
:= First
(Context_Items
(Par
));
2350 while Present
(Item2
) loop
2351 if Nkind
(Item2
) = N_With_Clause
2352 and then Entity
(Name
(Item2
)) = E
2365 end Within_Elaborate_All
;