1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1997-2014, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree
; use Atree
;
27 with Checks
; use Checks
;
28 with Debug
; use Debug
;
29 with Einfo
; use Einfo
;
30 with Elists
; use Elists
;
31 with Errout
; use Errout
;
32 with Exp_Tss
; use Exp_Tss
;
33 with Exp_Util
; use Exp_Util
;
34 with Expander
; use Expander
;
35 with Fname
; use Fname
;
37 with Lib
.Load
; use Lib
.Load
;
38 with Namet
; use Namet
;
39 with Nlists
; use Nlists
;
40 with Nmake
; use Nmake
;
42 with Output
; use Output
;
43 with Restrict
; use Restrict
;
44 with Rident
; use Rident
;
46 with Sem_Aux
; use Sem_Aux
;
47 with Sem_Cat
; use Sem_Cat
;
48 with Sem_Ch7
; use Sem_Ch7
;
49 with Sem_Ch8
; use Sem_Ch8
;
50 with Sem_Util
; use Sem_Util
;
51 with Sinfo
; use Sinfo
;
52 with Sinput
; use Sinput
;
53 with Snames
; use Snames
;
54 with Stand
; use Stand
;
56 with Tbuild
; use Tbuild
;
57 with Uintp
; use Uintp
;
58 with Uname
; use Uname
;
60 package body Sem_Elab
is
62 -- The following table records the recursive call chain for output in the
63 -- Output routine. Each entry records the call node and the entity of the
64 -- called routine. The number of entries in the table (i.e. the value of
65 -- Elab_Call.Last) indicates the current depth of recursion and is used to
66 -- identify the outer level.
68 type Elab_Call_Entry
is record
73 package Elab_Call
is new Table
.Table
(
74 Table_Component_Type
=> Elab_Call_Entry
,
75 Table_Index_Type
=> Int
,
78 Table_Increment
=> 100,
79 Table_Name
=> "Elab_Call");
81 -- This table is initialized at the start of each outer level call. It
82 -- holds the entities for all subprograms that have been examined for this
83 -- particular outer level call, and is used to prevent both infinite
84 -- recursion, and useless reanalysis of bodies already seen
86 package Elab_Visited
is new Table
.Table
(
87 Table_Component_Type
=> Entity_Id
,
88 Table_Index_Type
=> Int
,
91 Table_Increment
=> 100,
92 Table_Name
=> "Elab_Visited");
94 -- This table stores calls to Check_Internal_Call that are delayed
95 -- until all generics are instantiated, and in particular that all
96 -- generic bodies have been inserted. We need to delay, because we
97 -- need to be able to look through the inserted bodies.
99 type Delay_Element
is record
101 -- The parameter N from the call to Check_Internal_Call. Note that
102 -- this node may get rewritten over the delay period by expansion
103 -- in the call case (but not in the instantiation case).
106 -- The parameter E from the call to Check_Internal_Call
108 Orig_Ent
: Entity_Id
;
109 -- The parameter Orig_Ent from the call to Check_Internal_Call
112 -- The current scope of the call. This is restored when we complete
113 -- the delayed call, so that we do this in the right scope.
115 From_Elab_Code
: Boolean;
116 -- Save indication of whether this call is from elaboration code
118 Outer_Scope
: Entity_Id
;
119 -- Save scope of outer level call
122 package Delay_Check
is new Table
.Table
(
123 Table_Component_Type
=> Delay_Element
,
124 Table_Index_Type
=> Int
,
125 Table_Low_Bound
=> 1,
126 Table_Initial
=> 1000,
127 Table_Increment
=> 100,
128 Table_Name
=> "Delay_Check");
131 -- Top level scope of current scope. Compute this only once at the outer
132 -- level, i.e. for a call to Check_Elab_Call from outside this unit.
134 Outer_Level_Sloc
: Source_Ptr
;
135 -- Save Sloc value for outer level call node for comparisons of source
136 -- locations. A body is too late if it appears after the *outer* level
137 -- call, not the particular call that is being analyzed.
139 From_Elab_Code
: Boolean;
140 -- This flag shows whether the outer level call currently being examined
141 -- is or is not in elaboration code. We are only interested in calls to
142 -- routines in other units if this flag is True.
144 In_Task_Activation
: Boolean := False;
145 -- This flag indicates whether we are performing elaboration checks on
146 -- task procedures, at the point of activation. If true, we do not trace
147 -- internal calls in these procedures, because all local bodies are known
150 Delaying_Elab_Checks
: Boolean := True;
151 -- This is set True till the compilation is complete, including the
152 -- insertion of all instance bodies. Then when Check_Elab_Calls is called,
153 -- the delay table is used to make the delayed calls and this flag is reset
154 -- to False, so that the calls are processed.
156 -----------------------
157 -- Local Subprograms --
158 -----------------------
160 -- Note: Outer_Scope in all following specs represents the scope of
161 -- interest of the outer level call. If it is set to Standard_Standard,
162 -- then it means the outer level call was at elaboration level, and that
163 -- thus all calls are of interest. If it was set to some other scope,
164 -- then the original call was an inner call, and we are not interested
165 -- in calls that go outside this scope.
167 procedure Activate_Elaborate_All_Desirable
(N
: Node_Id
; U
: Entity_Id
);
168 -- Analysis of construct N shows that we should set Elaborate_All_Desirable
169 -- for the WITH clause for unit U (which will always be present). A special
170 -- case is when N is a function or procedure instantiation, in which case
171 -- it is sufficient to set Elaborate_Desirable, since in this case there is
172 -- no possibility of transitive elaboration issues.
174 procedure Check_A_Call
177 Outer_Scope
: Entity_Id
;
178 Inter_Unit_Only
: Boolean;
179 Generate_Warnings
: Boolean := True;
180 In_Init_Proc
: Boolean := False);
181 -- This is the internal recursive routine that is called to check for
182 -- possible elaboration error. The argument N is a subprogram call or
183 -- generic instantiation, or 'Access attribute reference to be checked, and
184 -- E is the entity of the called subprogram, or instantiated generic unit,
185 -- or subprogram referenced by 'Access.
187 -- The flag Outer_Scope is the outer level scope for the original call.
188 -- Inter_Unit_Only is set if the call is only to be checked in the
189 -- case where it is to another unit (and skipped if within a unit).
190 -- Generate_Warnings is set to False to suppress warning messages about
191 -- missing pragma Elaborate_All's. These messages are not wanted for
192 -- inner calls in the dynamic model. Note that an instance of the Access
193 -- attribute applied to a subprogram also generates a call to this
194 -- procedure (since the referenced subprogram may be called later
195 -- indirectly). Flag In_Init_Proc should be set whenever the current
196 -- context is a type init proc.
198 procedure Check_Bad_Instantiation
(N
: Node_Id
);
199 -- N is a node for an instantiation (if called with any other node kind,
200 -- Check_Bad_Instantiation ignores the call). This subprogram checks for
201 -- the special case of a generic instantiation of a generic spec in the
202 -- same declarative part as the instantiation where a body is present and
203 -- has not yet been seen. This is an obvious error, but needs to be checked
204 -- specially at the time of the instantiation, since it is a case where we
205 -- cannot insert the body anywhere. If this case is detected, warnings are
206 -- generated, and a raise of Program_Error is inserted. In addition any
207 -- subprograms in the generic spec are stubbed, and the Bad_Instantiation
208 -- flag is set on the instantiation node. The caller in Sem_Ch12 uses this
209 -- flag as an indication that no attempt should be made to insert an
212 procedure Check_Internal_Call
215 Outer_Scope
: Entity_Id
;
216 Orig_Ent
: Entity_Id
);
217 -- N is a function call or procedure statement call node and E is the
218 -- entity of the called function, which is within the current compilation
219 -- unit (where subunits count as part of the parent). This call checks if
220 -- this call, or any call within any accessed body could cause an ABE, and
221 -- if so, outputs a warning. Orig_Ent differs from E only in the case of
222 -- renamings, and points to the original name of the entity. This is used
223 -- for error messages. Outer_Scope is the outer level scope for the
226 procedure Check_Internal_Call_Continue
229 Outer_Scope
: Entity_Id
;
230 Orig_Ent
: Entity_Id
);
231 -- The processing for Check_Internal_Call is divided up into two phases,
232 -- and this represents the second phase. The second phase is delayed if
233 -- Delaying_Elab_Calls is set to True. In this delayed case, the first
234 -- phase makes an entry in the Delay_Check table, which is processed when
235 -- Check_Elab_Calls is called. N, E and Orig_Ent are as for the call to
236 -- Check_Internal_Call. Outer_Scope is the outer level scope for the
239 function Has_Generic_Body
(N
: Node_Id
) return Boolean;
240 -- N is a generic package instantiation node, and this routine determines
241 -- if this package spec does in fact have a generic body. If so, then
242 -- True is returned, otherwise False. Note that this is not at all the
243 -- same as checking if the unit requires a body, since it deals with
244 -- the case of optional bodies accurately (i.e. if a body is optional,
245 -- then it looks to see if a body is actually present). Note: this
246 -- function can only do a fully correct job if in generating code mode
247 -- where all bodies have to be present. If we are operating in semantics
248 -- check only mode, then in some cases of optional bodies, a result of
249 -- False may incorrectly be given. In practice this simply means that
250 -- some cases of warnings for incorrect order of elaboration will only
251 -- be given when generating code, which is not a big problem (and is
252 -- inevitable, given the optional body semantics of Ada).
254 procedure Insert_Elab_Check
(N
: Node_Id
; C
: Node_Id
:= Empty
);
255 -- Given code for an elaboration check (or unconditional raise if the check
256 -- is not needed), inserts the code in the appropriate place. N is the call
257 -- or instantiation node for which the check code is required. C is the
258 -- test whose failure triggers the raise.
260 function Is_Call_Of_Generic_Formal
(N
: Node_Id
) return Boolean;
261 -- Returns True if node N is a call to a generic formal subprogram
263 function Is_Finalization_Procedure
(Id
: Entity_Id
) return Boolean;
264 -- Determine whether entity Id denotes a [Deep_]Finalize procedure
266 procedure Output_Calls
268 Check_Elab_Flag
: Boolean);
269 -- Outputs chain of calls stored in the Elab_Call table. The caller has
270 -- already generated the main warning message, so the warnings generated
271 -- are all continuation messages. The argument is the call node at which
272 -- the messages are to be placed. When Check_Elab_Flag is set, calls are
273 -- enumerated only when flag Elab_Warning is set for the dynamic case or
274 -- when flag Elab_Info_Messages is set for the static case.
276 function Same_Elaboration_Scope
(Scop1
, Scop2
: Entity_Id
) return Boolean;
277 -- Given two scopes, determine whether they are the same scope from an
278 -- elaboration point of view, i.e. packages and blocks are ignored.
280 procedure Set_C_Scope
;
281 -- On entry C_Scope is set to some scope. On return, C_Scope is reset
282 -- to be the enclosing compilation unit of this scope.
284 function Get_Referenced_Ent
(N
: Node_Id
) return Entity_Id
;
285 -- N is either a function or procedure call or an access attribute that
286 -- references a subprogram. This call retrieves the relevant entity. If
287 -- this is a call to a protected subprogram, the entity is a selected
288 -- component. The callable entity may be absent, in which case Empty is
289 -- returned. This happens with non-analyzed calls in nested generics.
291 procedure Set_Elaboration_Constraint
295 -- The current unit U may depend semantically on some unit P which is not
296 -- in the current context. If there is an elaboration call that reaches P,
297 -- we need to indicate that P requires an Elaborate_All, but this is not
298 -- effective in U's ali file, if there is no with_clause for P. In this
299 -- case we add the Elaborate_All on the unit Q that directly or indirectly
300 -- makes P available. This can happen in two cases:
302 -- a) Q declares a subtype of a type declared in P, and the call is an
303 -- initialization call for an object of that subtype.
305 -- b) Q declares an object of some tagged type whose root type is
306 -- declared in P, and the initialization call uses object notation on
307 -- that object to reach a primitive operation or a classwide operation
310 -- If P appears in the context of U, the current processing is correct.
311 -- Otherwise we must identify these two cases to retrieve Q and place the
312 -- Elaborate_All_Desirable on it.
314 function Spec_Entity
(E
: Entity_Id
) return Entity_Id
;
315 -- Given a compilation unit entity, if it is a spec entity, it is returned
316 -- unchanged. If it is a body entity, then the spec for the corresponding
319 procedure Supply_Bodies
(N
: Node_Id
);
320 -- Given a node, N, that is either a subprogram declaration or a package
321 -- declaration, this procedure supplies dummy bodies for the subprogram
322 -- or for all subprograms in the package. If the given node is not one of
323 -- these two possibilities, then Supply_Bodies does nothing. The dummy body
324 -- contains a single Raise statement.
326 procedure Supply_Bodies
(L
: List_Id
);
327 -- Calls Supply_Bodies for all elements of the given list L
329 function Within
(E1
, E2
: Entity_Id
) return Boolean;
330 -- Given two scopes E1 and E2, returns True if E1 is equal to E2, or is one
331 -- of its contained scopes, False otherwise.
333 function Within_Elaborate_All
334 (Unit
: Unit_Number_Type
;
335 E
: Entity_Id
) return Boolean;
336 -- Return True if we are within the scope of an Elaborate_All for E, or if
337 -- we are within the scope of an Elaborate_All for some other unit U, and U
338 -- with's E. This prevents spurious warnings when the called entity is
339 -- renamed within U, or in case of generic instances.
341 --------------------------------------
342 -- Activate_Elaborate_All_Desirable --
343 --------------------------------------
345 procedure Activate_Elaborate_All_Desirable
(N
: Node_Id
; U
: Entity_Id
) is
346 UN
: constant Unit_Number_Type
:= Get_Code_Unit
(N
);
347 CU
: constant Node_Id
:= Cunit
(UN
);
348 UE
: constant Entity_Id
:= Cunit_Entity
(UN
);
349 Unm
: constant Unit_Name_Type
:= Unit_Name
(UN
);
350 CI
: constant List_Id
:= Context_Items
(CU
);
354 procedure Add_To_Context_And_Mark
(Itm
: Node_Id
);
355 -- This procedure is called when the elaborate indication must be
356 -- applied to a unit not in the context of the referencing unit. The
357 -- unit gets added to the context as an implicit with.
359 function In_Withs_Of
(UEs
: Entity_Id
) return Boolean;
360 -- UEs is the spec entity of a unit. If the unit to be marked is
361 -- in the context item list of this unit spec, then the call returns
362 -- True and Itm is left set to point to the relevant N_With_Clause node.
364 procedure Set_Elab_Flag
(Itm
: Node_Id
);
365 -- Sets Elaborate_[All_]Desirable as appropriate on Itm
367 -----------------------------
368 -- Add_To_Context_And_Mark --
369 -----------------------------
371 procedure Add_To_Context_And_Mark
(Itm
: Node_Id
) is
372 CW
: constant Node_Id
:=
373 Make_With_Clause
(Sloc
(Itm
),
377 Set_Library_Unit
(CW
, Library_Unit
(Itm
));
378 Set_Implicit_With
(CW
, True);
380 -- Set elaborate all desirable on copy and then append the copy to
381 -- the list of body with's and we are done.
385 end Add_To_Context_And_Mark
;
391 function In_Withs_Of
(UEs
: Entity_Id
) return Boolean is
392 UNs
: constant Unit_Number_Type
:= Get_Source_Unit
(UEs
);
393 CUs
: constant Node_Id
:= Cunit
(UNs
);
394 CIs
: constant List_Id
:= Context_Items
(CUs
);
398 while Present
(Itm
) loop
399 if Nkind
(Itm
) = N_With_Clause
then
401 Cunit_Entity
(Get_Cunit_Unit_Number
(Library_Unit
(Itm
)));
418 procedure Set_Elab_Flag
(Itm
: Node_Id
) is
420 if Nkind
(N
) in N_Subprogram_Instantiation
then
421 Set_Elaborate_Desirable
(Itm
);
423 Set_Elaborate_All_Desirable
(Itm
);
427 -- Start of processing for Activate_Elaborate_All_Desirable
430 -- Do not set binder indication if expansion is disabled, as when
431 -- compiling a generic unit.
433 if not Expander_Active
then
438 while Present
(Itm
) loop
439 if Nkind
(Itm
) = N_With_Clause
then
440 Ent
:= Cunit_Entity
(Get_Cunit_Unit_Number
(Library_Unit
(Itm
)));
442 -- If we find it, then mark elaborate all desirable and return
453 -- If we fall through then the with clause is not present in the
454 -- current unit. One legitimate possibility is that the with clause
455 -- is present in the spec when we are a body.
457 if Is_Body_Name
(Unm
)
458 and then In_Withs_Of
(Spec_Entity
(UE
))
460 Add_To_Context_And_Mark
(Itm
);
464 -- Similarly, we may be in the spec or body of a child unit, where
465 -- the unit in question is with'ed by some ancestor of the child unit.
467 if Is_Child_Name
(Unm
) then
475 exit when Pkg
= Standard_Standard
;
477 if In_Withs_Of
(Pkg
) then
478 Add_To_Context_And_Mark
(Itm
);
485 -- Here if we do not find with clause on spec or body. We just ignore
486 -- this case, it means that the elaboration involves some other unit
487 -- than the unit being compiled, and will be caught elsewhere.
490 end Activate_Elaborate_All_Desirable
;
496 procedure Check_A_Call
499 Outer_Scope
: Entity_Id
;
500 Inter_Unit_Only
: Boolean;
501 Generate_Warnings
: Boolean := True;
502 In_Init_Proc
: Boolean := False)
504 Access_Case
: constant Boolean := Nkind
(N
) = N_Attribute_Reference
;
505 -- Indicates if we have Access attribute case
507 procedure Elab_Warning
510 Ent
: Node_Or_Entity_Id
);
511 -- Generate a call to Error_Msg_NE with parameters Msg_D or Msg_S (for
512 -- dynamic or static elaboration model), N and Ent. Msg_D is a real
513 -- warning (output if Msg_D is non-null and Elab_Warnings is set),
514 -- Msg_S is an info message (output if Elab_Info_Messages is set.
520 procedure Elab_Warning
523 Ent
: Node_Or_Entity_Id
)
526 -- Dynamic elaboration checks, real warning
528 if Dynamic_Elaboration_Checks
then
529 if not Access_Case
then
530 if Msg_D
/= "" and then Elab_Warnings
then
531 Error_Msg_NE
(Msg_D
, N
, Ent
);
535 -- Static elaboration checks, info message
538 if Elab_Info_Messages
then
539 Error_Msg_NE
(Msg_S
, N
, Ent
);
546 Loc
: constant Source_Ptr
:= Sloc
(N
);
551 -- Top level scope of entity for called subprogram. This value includes
552 -- following renamings and derivations, so this scope can be in a
553 -- non-visible unit. This is the scope that is to be investigated to
554 -- see whether an elaboration check is required.
557 -- Top level scope of directly called entity for subprogram. This
558 -- differs from E_Scope in the case where renamings or derivations
559 -- are involved, since it does not follow these links. W_Scope is
560 -- generally in a visible unit, and it is this scope that may require
561 -- an Elaborate_All. However, there are some cases (initialization
562 -- calls and calls involving object notation) where W_Scope might not
563 -- be in the context of the current unit, and there is an intermediate
564 -- package that is, in which case the Elaborate_All has to be placed
565 -- on this intermediate package. These special cases are handled in
566 -- Set_Elaboration_Constraint.
568 Body_Acts_As_Spec
: Boolean;
569 -- Set to true if call is to body acting as spec (no separate spec)
571 Inst_Case
: constant Boolean := Nkind
(N
) in N_Generic_Instantiation
;
572 -- Indicates if we have instantiation case
574 Caller_Unit_Internal
: Boolean;
575 Callee_Unit_Internal
: Boolean;
577 Inst_Caller
: Source_Ptr
;
578 Inst_Callee
: Source_Ptr
;
580 Unit_Caller
: Unit_Number_Type
;
581 Unit_Callee
: Unit_Number_Type
;
583 Cunit_SC
: Boolean := False;
584 -- Set to suppress dynamic elaboration checks where one of the
585 -- enclosing scopes has Elaboration_Checks_Suppressed set, or else
586 -- if a pragma Elaborate (_All) applies to that scope, in which case
587 -- warnings on the scope are also suppressed. For the internal case,
588 -- we ignore this flag.
590 -- Start of processing for Check_A_Call
593 -- If the call is known to be within a local Suppress Elaboration
594 -- pragma, nothing to check. This can happen in task bodies. But
595 -- we ignore this for a call to a generic formal.
597 if Nkind
(N
) in N_Subprogram_Call
598 and then No_Elaboration_Check
(N
)
599 and then not Is_Call_Of_Generic_Formal
(N
)
604 -- Go to parent for derived subprogram, or to original subprogram in the
605 -- case of a renaming (Alias covers both these cases).
609 if (Suppress_Elaboration_Warnings
(Ent
)
610 or else Elaboration_Checks_Suppressed
(Ent
))
611 and then (Inst_Case
or else No
(Alias
(Ent
)))
616 -- Nothing to do for imported entities
618 if Is_Imported
(Ent
) then
622 exit when Inst_Case
or else No
(Alias
(Ent
));
626 Decl
:= Unit_Declaration_Node
(Ent
);
628 if Nkind
(Decl
) = N_Subprogram_Body
then
629 Body_Acts_As_Spec
:= True;
631 elsif Nkind_In
(Decl
, N_Subprogram_Declaration
, N_Subprogram_Body_Stub
)
634 Body_Acts_As_Spec
:= False;
636 -- If we have none of an instantiation, subprogram body or subprogram
637 -- declaration, then it is not a case that we want to check. (One case
638 -- is a call to a generic formal subprogram, where we do not want the
639 -- check in the template).
647 if Elaboration_Checks_Suppressed
(E_Scope
)
648 or else Suppress_Elaboration_Warnings
(E_Scope
)
653 -- Exit when we get to compilation unit, not counting subunits
655 exit when Is_Compilation_Unit
(E_Scope
)
656 and then (Is_Child_Unit
(E_Scope
)
657 or else Scope
(E_Scope
) = Standard_Standard
);
659 -- If we did not find a compilation unit, other than standard,
660 -- then nothing to check (happens in some instantiation cases)
662 if E_Scope
= Standard_Standard
then
665 -- Otherwise move up a scope looking for compilation unit
668 E_Scope
:= Scope
(E_Scope
);
672 -- No checks needed for pure or preelaborated compilation units
674 if Is_Pure
(E_Scope
) or else Is_Preelaborated
(E_Scope
) then
678 -- If the generic entity is within a deeper instance than we are, then
679 -- either the instantiation to which we refer itself caused an ABE, in
680 -- which case that will be handled separately, or else we know that the
681 -- body we need appears as needed at the point of the instantiation.
682 -- However, this assumption is only valid if we are in static mode.
684 if not Dynamic_Elaboration_Checks
686 Instantiation_Depth
(Sloc
(Ent
)) > Instantiation_Depth
(Sloc
(N
))
691 -- Do not give a warning for a package with no body
693 if Ekind
(Ent
) = E_Generic_Package
and then not Has_Generic_Body
(N
) then
697 -- Case of entity is not in current unit (i.e. with'ed unit case)
699 if E_Scope
/= C_Scope
then
701 -- We are only interested in such calls if the outer call was from
702 -- elaboration code, or if we are in Dynamic_Elaboration_Checks mode.
704 if not From_Elab_Code
and then not Dynamic_Elaboration_Checks
then
708 -- Nothing to do if some scope said that no checks were required
714 -- Nothing to do for a generic instance, because in this case the
715 -- checking was at the point of instantiation of the generic However,
716 -- this shortcut is only applicable in static mode.
718 if Is_Generic_Instance
(Ent
) and not Dynamic_Elaboration_Checks
then
722 -- Nothing to do if subprogram with no separate spec. However, a
723 -- call to Deep_Initialize may result in a call to a user-defined
724 -- Initialize procedure, which imposes a body dependency. This
725 -- happens only if the type is controlled and the Initialize
726 -- procedure is not inherited.
728 if Body_Acts_As_Spec
then
729 if Is_TSS
(Ent
, TSS_Deep_Initialize
) then
731 Typ
: constant Entity_Id
:= Etype
(First_Formal
(Ent
));
735 if not Is_Controlled
(Typ
) then
738 Init
:= Find_Prim_Op
(Typ
, Name_Initialize
);
740 if Comes_From_Source
(Init
) then
753 -- Check cases of internal units
755 Callee_Unit_Internal
:=
756 Is_Internal_File_Name
757 (Unit_File_Name
(Get_Source_Unit
(E_Scope
)));
759 -- Do not give a warning if the with'ed unit is internal and this is
760 -- the generic instantiation case (this saves a lot of hassle dealing
761 -- with the Text_IO special child units)
763 if Callee_Unit_Internal
and Inst_Case
then
767 if C_Scope
= Standard_Standard
then
768 Caller_Unit_Internal
:= False;
770 Caller_Unit_Internal
:=
771 Is_Internal_File_Name
772 (Unit_File_Name
(Get_Source_Unit
(C_Scope
)));
775 -- Do not give a warning if the with'ed unit is internal and the
776 -- caller is not internal (since the binder always elaborates
777 -- internal units first).
779 if Callee_Unit_Internal
and (not Caller_Unit_Internal
) then
783 -- For now, if debug flag -gnatdE is not set, do no checking for
784 -- one internal unit withing another. This fixes the problem with
785 -- the sgi build and storage errors. To be resolved later ???
787 if (Callee_Unit_Internal
and Caller_Unit_Internal
)
788 and then not Debug_Flag_EE
793 if Is_TSS
(E
, TSS_Deep_Initialize
) then
797 -- If the call is in an instance, and the called entity is not
798 -- defined in the same instance, then the elaboration issue focuses
799 -- around the unit containing the template, it is this unit which
800 -- requires an Elaborate_All.
802 -- However, if we are doing dynamic elaboration, we need to chase the
803 -- call in the usual manner.
805 -- We also need to chase the call in the usual manner if it is a call
806 -- to a generic formal parameter, since that case was not handled as
807 -- part of the processing of the template.
809 Inst_Caller
:= Instantiation
(Get_Source_File_Index
(Sloc
(N
)));
810 Inst_Callee
:= Instantiation
(Get_Source_File_Index
(Sloc
(Ent
)));
812 if Inst_Caller
= No_Location
then
813 Unit_Caller
:= No_Unit
;
815 Unit_Caller
:= Get_Source_Unit
(N
);
818 if Inst_Callee
= No_Location
then
819 Unit_Callee
:= No_Unit
;
821 Unit_Callee
:= Get_Source_Unit
(Ent
);
824 if Unit_Caller
/= No_Unit
825 and then Unit_Callee
/= Unit_Caller
826 and then not Dynamic_Elaboration_Checks
827 and then not Is_Call_Of_Generic_Formal
(N
)
829 E_Scope
:= Spec_Entity
(Cunit_Entity
(Unit_Caller
));
831 -- If we don't get a spec entity, just ignore call. Not quite
832 -- clear why this check is necessary. ???
838 -- Otherwise step to enclosing compilation unit
840 while not Is_Compilation_Unit
(E_Scope
) loop
841 E_Scope
:= Scope
(E_Scope
);
844 -- For the case where N is not an instance, and is not a call within
845 -- instance to other than a generic formal, we recompute E_Scope
846 -- for the error message, since we do NOT want to go to the unit
847 -- which has the ultimate declaration in the case of renaming and
848 -- derivation and we also want to go to the generic unit in the
849 -- case of an instance, and no further.
852 -- Loop to carefully follow renamings and derivations one step
853 -- outside the current unit, but not further.
855 if not Inst_Case
and then Present
(Alias
(Ent
)) then
856 E_Scope
:= Alias
(Ent
);
862 while not Is_Compilation_Unit
(E_Scope
) loop
863 E_Scope
:= Scope
(E_Scope
);
866 -- If E_Scope is the same as C_Scope, it means that there
867 -- definitely was a local renaming or derivation, and we
868 -- are not yet out of the current unit.
870 exit when E_Scope
/= C_Scope
;
874 -- If no alias, there is a previous error
877 Check_Error_Detected
;
883 if Within_Elaborate_All
(Current_Sem_Unit
, E_Scope
) then
887 -- Find top level scope for called entity (not following renamings
888 -- or derivations). This is where the Elaborate_All will go if it
889 -- is needed. We start with the called entity, except in the case
890 -- of an initialization procedure outside the current package, where
891 -- the init proc is in the root package, and we start from the entity
892 -- of the name in the call.
895 Ent
: constant Entity_Id
:= Get_Referenced_Ent
(N
);
897 if Is_Init_Proc
(Ent
)
898 and then not In_Same_Extended_Unit
(N
, Ent
)
900 W_Scope
:= Scope
(Ent
);
906 -- Now loop through scopes to get to the enclosing compilation unit
908 while not Is_Compilation_Unit
(W_Scope
) loop
909 W_Scope
:= Scope
(W_Scope
);
912 -- Now check if an elaborate_all (or dynamic check) is needed
914 if not Suppress_Elaboration_Warnings
(Ent
)
915 and then not Elaboration_Checks_Suppressed
(Ent
)
916 and then not Suppress_Elaboration_Warnings
(E_Scope
)
917 and then not Elaboration_Checks_Suppressed
(E_Scope
)
918 and then (Elab_Warnings
or Elab_Info_Messages
)
919 and then Generate_Warnings
921 -- Instantiation case
925 ("instantiation of& may raise Program_Error?l?",
926 "info: instantiation of& during elaboration?$?", Ent
);
928 -- Indirect call case, info message only in static elaboration
929 -- case, because the attribute reference itself cannot raise an
932 elsif Access_Case
then
934 ("", "info: access to& during elaboration?$?", Ent
);
936 -- Subprogram call case
939 if Nkind
(Name
(N
)) in N_Has_Entity
940 and then Is_Init_Proc
(Entity
(Name
(N
)))
941 and then Comes_From_Source
(Ent
)
944 ("implicit call to & may raise Program_Error?l?",
945 "info: implicit call to & during elaboration?$?",
950 ("call to & may raise Program_Error?l?",
951 "info: call to & during elaboration?$?",
956 Error_Msg_Qual_Level
:= Nat
'Last;
958 if Nkind
(N
) in N_Subprogram_Instantiation
then
960 ("\missing pragma Elaborate for&?l?",
961 "\implicit pragma Elaborate for& generated?$?",
966 ("\missing pragma Elaborate_All for&?l?",
967 "\implicit pragma Elaborate_All for & generated?$?",
971 Error_Msg_Qual_Level
:= 0;
973 -- Take into account the flags related to elaboration warning
974 -- messages when enumerating the various calls involved. This
975 -- ensures the proper pairing of the main warning and the
976 -- clarification messages generated by Output_Calls.
978 Output_Calls
(N
, Check_Elab_Flag
=> True);
980 -- Set flag to prevent further warnings for same unit unless in
983 if not All_Errors_Mode
and not Dynamic_Elaboration_Checks
then
984 Set_Suppress_Elaboration_Warnings
(W_Scope
, True);
988 -- Check for runtime elaboration check required
990 if Dynamic_Elaboration_Checks
then
991 if not Elaboration_Checks_Suppressed
(Ent
)
992 and then not Elaboration_Checks_Suppressed
(W_Scope
)
993 and then not Elaboration_Checks_Suppressed
(E_Scope
)
994 and then not Cunit_SC
996 -- Runtime elaboration check required. Generate check of the
997 -- elaboration Boolean for the unit containing the entity.
999 -- Note that for this case, we do check the real unit (the one
1000 -- from following renamings, since that is the issue).
1002 -- Could this possibly miss a useless but required PE???
1004 Insert_Elab_Check
(N
,
1005 Make_Attribute_Reference
(Loc
,
1006 Attribute_Name
=> Name_Elaborated
,
1008 New_Occurrence_Of
(Spec_Entity
(E_Scope
), Loc
)));
1010 -- Prevent duplicate elaboration checks on the same call,
1011 -- which can happen if the body enclosing the call appears
1012 -- itself in a call whose elaboration check is delayed.
1014 if Nkind
(N
) in N_Subprogram_Call
then
1015 Set_No_Elaboration_Check
(N
);
1019 -- Case of static elaboration model
1022 -- Do not do anything if elaboration checks suppressed. Note that
1023 -- we check Ent here, not E, since we want the real entity for the
1024 -- body to see if checks are suppressed for it, not the dummy
1025 -- entry for renamings or derivations.
1027 if Elaboration_Checks_Suppressed
(Ent
)
1028 or else Elaboration_Checks_Suppressed
(E_Scope
)
1029 or else Elaboration_Checks_Suppressed
(W_Scope
)
1033 -- Do not generate an Elaborate_All for finalization routines
1034 -- which perform partial clean up as part of initialization.
1036 elsif In_Init_Proc
and then Is_Finalization_Procedure
(Ent
) then
1039 -- Here we need to generate an implicit elaborate all
1042 -- Generate Elaborate_all warning unless suppressed
1044 if (Elab_Info_Messages
and Generate_Warnings
and not Inst_Case
)
1045 and then not Suppress_Elaboration_Warnings
(Ent
)
1046 and then not Suppress_Elaboration_Warnings
(E_Scope
)
1047 and then not Suppress_Elaboration_Warnings
(W_Scope
)
1049 Error_Msg_Node_2
:= W_Scope
;
1051 ("info: call to& in elaboration code " &
1052 "requires pragma Elaborate_All on&?$?", N
, E
);
1055 -- Set indication for binder to generate Elaborate_All
1057 Set_Elaboration_Constraint
(N
, E
, W_Scope
);
1061 -- Case of entity is in same unit as call or instantiation
1063 elsif not Inter_Unit_Only
then
1064 Check_Internal_Call
(N
, Ent
, Outer_Scope
, E
);
1068 -----------------------------
1069 -- Check_Bad_Instantiation --
1070 -----------------------------
1072 procedure Check_Bad_Instantiation
(N
: Node_Id
) is
1076 -- Nothing to do if we do not have an instantiation (happens in some
1077 -- error cases, and also in the formal package declaration case)
1079 if Nkind
(N
) not in N_Generic_Instantiation
then
1082 -- Nothing to do if serious errors detected (avoid cascaded errors)
1084 elsif Serious_Errors_Detected
/= 0 then
1087 -- Nothing to do if not in full analysis mode
1089 elsif not Full_Analysis
then
1092 -- Nothing to do if inside a generic template
1094 elsif Inside_A_Generic
then
1097 -- Nothing to do if a library level instantiation
1099 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
1102 -- Nothing to do if we are compiling a proper body for semantic
1103 -- purposes only. The generic body may be in another proper body.
1106 Nkind
(Parent
(Unit_Declaration_Node
(Main_Unit_Entity
))) = N_Subunit
1111 Ent
:= Get_Generic_Entity
(N
);
1113 -- The case we are interested in is when the generic spec is in the
1114 -- current declarative part
1116 if not Same_Elaboration_Scope
(Current_Scope
, Scope
(Ent
))
1117 or else not In_Same_Extended_Unit
(N
, Ent
)
1122 -- If the generic entity is within a deeper instance than we are, then
1123 -- either the instantiation to which we refer itself caused an ABE, in
1124 -- which case that will be handled separately. Otherwise, we know that
1125 -- the body we need appears as needed at the point of the instantiation.
1126 -- If they are both at the same level but not within the same instance
1127 -- then the body of the generic will be in the earlier instance.
1130 D1
: constant Int
:= Instantiation_Depth
(Sloc
(Ent
));
1131 D2
: constant Int
:= Instantiation_Depth
(Sloc
(N
));
1138 and then Is_Generic_Instance
(Scope
(Ent
))
1139 and then not In_Open_Scopes
(Scope
(Ent
))
1145 -- Now we can proceed, if the entity being called has a completion,
1146 -- then we are definitely OK, since we have already seen the body.
1148 if Has_Completion
(Ent
) then
1152 -- If there is no body, then nothing to do
1154 if not Has_Generic_Body
(N
) then
1158 -- Here we definitely have a bad instantiation
1160 Error_Msg_Warn
:= SPARK_Mode
/= On
;
1161 Error_Msg_NE
("cannot instantiate& before body seen<<", N
, Ent
);
1163 if Present
(Instance_Spec
(N
)) then
1164 Supply_Bodies
(Instance_Spec
(N
));
1167 Error_Msg_N
("\Program_Error [<<", N
);
1168 Insert_Elab_Check
(N
);
1169 Set_ABE_Is_Certain
(N
);
1170 end Check_Bad_Instantiation
;
1172 ---------------------
1173 -- Check_Elab_Call --
1174 ---------------------
1176 procedure Check_Elab_Call
1178 Outer_Scope
: Entity_Id
:= Empty
;
1179 In_Init_Proc
: Boolean := False)
1185 -- If the call does not come from the main unit, there is nothing to
1186 -- check. Elaboration call from units in the context of the main unit
1187 -- will lead to semantic dependencies when those units are compiled.
1189 if not In_Extended_Main_Code_Unit
(N
) then
1193 -- For an entry call, check relevant restriction
1195 if Nkind
(N
) = N_Entry_Call_Statement
1196 and then not In_Subprogram_Or_Concurrent_Unit
1198 Check_Restriction
(No_Entry_Calls_In_Elaboration_Code
, N
);
1200 -- Nothing to do if this is not a call or attribute reference (happens
1201 -- in some error conditions, and in some cases where rewriting occurs).
1203 elsif Nkind
(N
) not in N_Subprogram_Call
1204 and then Nkind
(N
) /= N_Attribute_Reference
1208 -- Nothing to do if this is a call already rewritten for elab checking
1210 elsif Nkind
(Parent
(N
)) = N_If_Expression
then
1213 -- Nothing to do if inside a generic template
1215 elsif Inside_A_Generic
1216 and then No
(Enclosing_Generic_Body
(N
))
1221 -- Nothing to do if this is a call to a postcondition, which is always
1222 -- within a subprogram body, even though the current scope may be the
1223 -- enclosing scope of the subprogram.
1225 if Nkind
(N
) = N_Procedure_Call_Statement
1226 and then Is_Entity_Name
(Name
(N
))
1227 and then Chars
(Entity
(Name
(N
))) = Name_uPostconditions
1232 -- Here we have a call at elaboration time which must be checked
1234 if Debug_Flag_LL
then
1235 Write_Str
(" Check_Elab_Call: ");
1237 if Nkind
(N
) = N_Attribute_Reference
then
1238 if not Is_Entity_Name
(Prefix
(N
)) then
1239 Write_Str
("<<not entity name>>");
1241 Write_Name
(Chars
(Entity
(Prefix
(N
))));
1243 Write_Str
("'Access");
1245 elsif No
(Name
(N
)) or else not Is_Entity_Name
(Name
(N
)) then
1246 Write_Str
("<<not entity name>> ");
1249 Write_Name
(Chars
(Entity
(Name
(N
))));
1252 Write_Str
(" call at ");
1253 Write_Location
(Sloc
(N
));
1257 -- Climb up the tree to make sure we are not inside default expression
1258 -- of a parameter specification or a record component, since in both
1259 -- these cases, we will be doing the actual call later, not now, and it
1260 -- is at the time of the actual call (statically speaking) that we must
1261 -- do our static check, not at the time of its initial analysis).
1263 -- However, we have to check calls within component definitions (e.g.
1264 -- a function call that determines an array component bound), so we
1265 -- terminate the loop in that case.
1268 while Present
(P
) loop
1269 if Nkind_In
(P
, N_Parameter_Specification
,
1270 N_Component_Declaration
)
1274 -- The call occurs within the constraint of a component,
1275 -- so it must be checked.
1277 elsif Nkind
(P
) = N_Component_Definition
then
1285 -- Stuff that happens only at the outer level
1287 if No
(Outer_Scope
) then
1288 Elab_Visited
.Set_Last
(0);
1290 -- Nothing to do if current scope is Standard (this is a bit odd, but
1291 -- it happens in the case of generic instantiations).
1293 C_Scope
:= Current_Scope
;
1295 if C_Scope
= Standard_Standard
then
1299 -- First case, we are in elaboration code
1301 From_Elab_Code
:= not In_Subprogram_Or_Concurrent_Unit
;
1303 if From_Elab_Code
then
1305 -- Complain if call that comes from source in preelaborated unit
1306 -- and we are not inside a subprogram (i.e. we are in elab code).
1308 if Comes_From_Source
(N
)
1309 and then In_Preelaborated_Unit
1310 and then not In_Inlined_Body
1311 and then Nkind
(N
) /= N_Attribute_Reference
1313 -- This is a warning in GNAT mode allowing such calls to be
1314 -- used in the predefined library with appropriate care.
1316 Error_Msg_Warn
:= GNAT_Mode
;
1318 ("<<non-static call not allowed in preelaborated unit", N
);
1322 -- Second case, we are inside a subprogram or concurrent unit, which
1323 -- means we are not in elaboration code.
1326 -- In this case, the issue is whether we are inside the
1327 -- declarative part of the unit in which we live, or inside its
1328 -- statements. In the latter case, there is no issue of ABE calls
1329 -- at this level (a call from outside to the unit in which we live
1330 -- might cause an ABE, but that will be detected when we analyze
1331 -- that outer level call, as it recurses into the called unit).
1333 -- Climb up the tree, doing this test, and also testing for being
1334 -- inside a default expression, which, as discussed above, is not
1335 -- checked at this stage.
1344 -- If we find a parentless subtree, it seems safe to assume
1345 -- that we are not in a declarative part and that no
1346 -- checking is required.
1352 if Is_List_Member
(P
) then
1353 L
:= List_Containing
(P
);
1360 exit when Nkind
(P
) = N_Subunit
;
1362 -- Filter out case of default expressions, where we do not
1363 -- do the check at this stage.
1365 if Nkind_In
(P
, N_Parameter_Specification
,
1366 N_Component_Declaration
)
1371 -- A protected body has no elaboration code and contains
1372 -- only other bodies.
1374 if Nkind
(P
) = N_Protected_Body
then
1377 elsif Nkind_In
(P
, N_Subprogram_Body
,
1382 if L
= Declarations
(P
) then
1385 -- We are not in elaboration code, but we are doing
1386 -- dynamic elaboration checks, in this case, we still
1387 -- need to do the call, since the subprogram we are in
1388 -- could be called from another unit, also in dynamic
1389 -- elaboration check mode, at elaboration time.
1391 elsif Dynamic_Elaboration_Checks
then
1393 -- We provide a debug flag to disable this check. That
1394 -- way we have an easy work around for regressions
1395 -- that are caused by this new check. This debug flag
1396 -- can be removed later.
1398 if Debug_Flag_DD
then
1402 -- Do the check in this case
1406 elsif Nkind
(P
) = N_Task_Body
then
1408 -- The check is deferred until Check_Task_Activation
1409 -- but we need to capture local suppress pragmas
1410 -- that may inhibit checks on this call.
1412 Ent
:= Get_Referenced_Ent
(N
);
1417 elsif Elaboration_Checks_Suppressed
(Current_Scope
)
1418 or else Elaboration_Checks_Suppressed
(Ent
)
1419 or else Elaboration_Checks_Suppressed
(Scope
(Ent
))
1421 Set_No_Elaboration_Check
(N
);
1426 -- Static model, call is not in elaboration code, we
1427 -- never need to worry, because in the static model the
1428 -- top level caller always takes care of things.
1439 Ent
:= Get_Referenced_Ent
(N
);
1445 -- Nothing to do if this is a recursive call (i.e. a call to
1446 -- an entity that is already in the Elab_Call stack)
1448 for J
in 1 .. Elab_Visited
.Last
loop
1449 if Ent
= Elab_Visited
.Table
(J
) then
1454 -- See if we need to analyze this call. We analyze it if either of
1455 -- the following conditions is met:
1457 -- It is an inner level call (since in this case it was triggered
1458 -- by an outer level call from elaboration code), but only if the
1459 -- call is within the scope of the original outer level call.
1461 -- It is an outer level call from elaboration code, or the called
1462 -- entity is in the same elaboration scope.
1464 -- And in these cases, we will check both inter-unit calls and
1465 -- intra-unit (within a single unit) calls.
1467 C_Scope
:= Current_Scope
;
1469 -- If not outer level call, then we follow it if it is within the
1470 -- original scope of the outer call.
1472 if Present
(Outer_Scope
)
1473 and then Within
(Scope
(Ent
), Outer_Scope
)
1479 Outer_Scope
=> Outer_Scope
,
1480 Inter_Unit_Only
=> False,
1481 In_Init_Proc
=> In_Init_Proc
);
1483 -- Nothing to do if elaboration checks suppressed for this scope.
1484 -- However, an interesting exception, the fact that elaboration checks
1485 -- are suppressed within an instance (because we can trace the body when
1486 -- we process the template) does not extend to calls to generic formal
1489 elsif Elaboration_Checks_Suppressed
(Current_Scope
)
1490 and then not Is_Call_Of_Generic_Formal
(N
)
1494 elsif From_Elab_Code
then
1496 Check_A_Call
(N
, Ent
, Standard_Standard
, Inter_Unit_Only
=> False);
1498 elsif Same_Elaboration_Scope
(C_Scope
, Scope
(Ent
)) then
1500 Check_A_Call
(N
, Ent
, Scope
(Ent
), Inter_Unit_Only
=> False);
1502 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode
1503 -- is set, then we will do the check, but only in the inter-unit case
1504 -- (this is to accommodate unguarded elaboration calls from other units
1505 -- in which this same mode is set). We don't want warnings in this case,
1506 -- it would generate warnings having nothing to do with elaboration.
1508 elsif Dynamic_Elaboration_Checks
then
1514 Inter_Unit_Only
=> True,
1515 Generate_Warnings
=> False);
1517 -- Otherwise nothing to do
1523 -- A call to an Init_Proc in elaboration code may bring additional
1524 -- dependencies, if some of the record components thereof have
1525 -- initializations that are function calls that come from source. We
1526 -- treat the current node as a call to each of these functions, to check
1527 -- their elaboration impact.
1529 if Is_Init_Proc
(Ent
) and then From_Elab_Code
then
1530 Process_Init_Proc
: declare
1531 Unit_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Ent
);
1533 function Check_Init_Call
(Nod
: Node_Id
) return Traverse_Result
;
1534 -- Find subprogram calls within body of Init_Proc for Traverse
1535 -- instantiation below.
1537 procedure Traverse_Body
is new Traverse_Proc
(Check_Init_Call
);
1538 -- Traversal procedure to find all calls with body of Init_Proc
1540 ---------------------
1541 -- Check_Init_Call --
1542 ---------------------
1544 function Check_Init_Call
(Nod
: Node_Id
) return Traverse_Result
is
1548 if Nkind
(Nod
) in N_Subprogram_Call
1549 and then Is_Entity_Name
(Name
(Nod
))
1551 Func
:= Entity
(Name
(Nod
));
1553 if Comes_From_Source
(Func
) then
1555 (N
, Func
, Standard_Standard
, Inter_Unit_Only
=> True);
1563 end Check_Init_Call
;
1565 -- Start of processing for Process_Init_Proc
1568 if Nkind
(Unit_Decl
) = N_Subprogram_Body
then
1569 Traverse_Body
(Handled_Statement_Sequence
(Unit_Decl
));
1571 end Process_Init_Proc
;
1573 end Check_Elab_Call
;
1575 -----------------------
1576 -- Check_Elab_Assign --
1577 -----------------------
1579 procedure Check_Elab_Assign
(N
: Node_Id
) is
1583 Pkg_Spec
: Entity_Id
;
1584 Pkg_Body
: Entity_Id
;
1587 -- For record or array component, check prefix. If it is an access type,
1588 -- then there is nothing to do (we do not know what is being assigned),
1589 -- but otherwise this is an assignment to the prefix.
1591 if Nkind_In
(N
, N_Indexed_Component
,
1592 N_Selected_Component
,
1595 if not Is_Access_Type
(Etype
(Prefix
(N
))) then
1596 Check_Elab_Assign
(Prefix
(N
));
1602 -- For type conversion, check expression
1604 if Nkind
(N
) = N_Type_Conversion
then
1605 Check_Elab_Assign
(Expression
(N
));
1609 -- Nothing to do if this is not an entity reference otherwise get entity
1611 if Is_Entity_Name
(N
) then
1617 -- What we are looking for is a reference in the body of a package that
1618 -- modifies a variable declared in the visible part of the package spec.
1621 and then Comes_From_Source
(N
)
1622 and then not Suppress_Elaboration_Warnings
(Ent
)
1623 and then Ekind
(Ent
) = E_Variable
1624 and then not In_Private_Part
(Ent
)
1625 and then Is_Library_Level_Entity
(Ent
)
1627 Scop
:= Current_Scope
;
1629 if No
(Scop
) or else Scop
= Standard_Standard
then
1631 elsif Ekind
(Scop
) = E_Package
1632 and then Is_Compilation_Unit
(Scop
)
1636 Scop
:= Scope
(Scop
);
1640 -- Here Scop points to the containing library package
1643 Pkg_Body
:= Body_Entity
(Pkg_Spec
);
1645 -- All OK if the package has an Elaborate_Body pragma
1647 if Has_Pragma_Elaborate_Body
(Scop
) then
1651 -- OK if entity being modified is not in containing package spec
1653 if not In_Same_Source_Unit
(Scop
, Ent
) then
1657 -- All OK if entity appears in generic package or generic instance.
1658 -- We just get too messed up trying to give proper warnings in the
1659 -- presence of generics. Better no message than a junk one.
1661 Scop
:= Scope
(Ent
);
1662 while Present
(Scop
) and then Scop
/= Pkg_Spec
loop
1663 if Ekind
(Scop
) = E_Generic_Package
then
1665 elsif Ekind
(Scop
) = E_Package
1666 and then Is_Generic_Instance
(Scop
)
1671 Scop
:= Scope
(Scop
);
1674 -- All OK if in task, don't issue warnings there
1676 if In_Task_Activation
then
1680 -- OK if no package body
1682 if No
(Pkg_Body
) then
1686 -- OK if reference is not in package body
1688 if not In_Same_Source_Unit
(Pkg_Body
, N
) then
1692 -- OK if package body has no handled statement sequence
1695 HSS
: constant Node_Id
:=
1696 Handled_Statement_Sequence
(Declaration_Node
(Pkg_Body
));
1698 if No
(HSS
) or else not Comes_From_Source
(HSS
) then
1703 -- We definitely have a case of a modification of an entity in
1704 -- the package spec from the elaboration code of the package body.
1705 -- We may not give the warning (because there are some additional
1706 -- checks to avoid too many false positives), but it would be a good
1707 -- idea for the binder to try to keep the body elaboration close to
1708 -- the spec elaboration.
1710 Set_Elaborate_Body_Desirable
(Pkg_Spec
);
1712 -- All OK in gnat mode (we know what we are doing)
1718 -- All OK if all warnings suppressed
1720 if Warning_Mode
= Suppress
then
1724 -- All OK if elaboration checks suppressed for entity
1726 if Checks_May_Be_Suppressed
(Ent
)
1727 and then Is_Check_Suppressed
(Ent
, Elaboration_Check
)
1732 -- OK if the entity is initialized. Note that the No_Initialization
1733 -- flag usually means that the initialization has been rewritten into
1734 -- assignments, but that still counts for us.
1737 Decl
: constant Node_Id
:= Declaration_Node
(Ent
);
1739 if Nkind
(Decl
) = N_Object_Declaration
1740 and then (Present
(Expression
(Decl
))
1741 or else No_Initialization
(Decl
))
1747 -- Here is where we give the warning
1749 -- All OK if warnings suppressed on the entity
1751 if not Has_Warnings_Off
(Ent
) then
1752 Error_Msg_Sloc
:= Sloc
(Ent
);
1755 ("??& can be accessed by clients before this initialization",
1758 ("\??add Elaborate_Body to spec to ensure & is initialized",
1762 if not All_Errors_Mode
then
1763 Set_Suppress_Elaboration_Warnings
(Ent
);
1766 end Check_Elab_Assign
;
1768 ----------------------
1769 -- Check_Elab_Calls --
1770 ----------------------
1772 procedure Check_Elab_Calls
is
1774 -- If expansion is disabled, do not generate any checks. Also skip
1775 -- checks if any subunits are missing because in either case we lack the
1776 -- full information that we need, and no object file will be created in
1779 if not Expander_Active
1780 or else Is_Generic_Unit
(Cunit_Entity
(Main_Unit
))
1781 or else Subunits_Missing
1786 -- Skip delayed calls if we had any errors
1788 if Serious_Errors_Detected
= 0 then
1789 Delaying_Elab_Checks
:= False;
1790 Expander_Mode_Save_And_Set
(True);
1792 for J
in Delay_Check
.First
.. Delay_Check
.Last
loop
1793 Push_Scope
(Delay_Check
.Table
(J
).Curscop
);
1794 From_Elab_Code
:= Delay_Check
.Table
(J
).From_Elab_Code
;
1796 Check_Internal_Call_Continue
(
1797 N
=> Delay_Check
.Table
(J
).N
,
1798 E
=> Delay_Check
.Table
(J
).E
,
1799 Outer_Scope
=> Delay_Check
.Table
(J
).Outer_Scope
,
1800 Orig_Ent
=> Delay_Check
.Table
(J
).Orig_Ent
);
1805 -- Set Delaying_Elab_Checks back on for next main compilation
1807 Expander_Mode_Restore
;
1808 Delaying_Elab_Checks
:= True;
1810 end Check_Elab_Calls
;
1812 ------------------------------
1813 -- Check_Elab_Instantiation --
1814 ------------------------------
1816 procedure Check_Elab_Instantiation
1818 Outer_Scope
: Entity_Id
:= Empty
)
1823 -- Check for and deal with bad instantiation case. There is some
1824 -- duplicated code here, but we will worry about this later ???
1826 Check_Bad_Instantiation
(N
);
1828 if ABE_Is_Certain
(N
) then
1832 -- Nothing to do if we do not have an instantiation (happens in some
1833 -- error cases, and also in the formal package declaration case)
1835 if Nkind
(N
) not in N_Generic_Instantiation
then
1839 -- Nothing to do if inside a generic template
1841 if Inside_A_Generic
then
1845 -- Nothing to do if the instantiation is not in the main unit
1847 if not In_Extended_Main_Code_Unit
(N
) then
1851 Ent
:= Get_Generic_Entity
(N
);
1852 From_Elab_Code
:= not In_Subprogram_Or_Concurrent_Unit
;
1854 -- See if we need to analyze this instantiation. We analyze it if
1855 -- either of the following conditions is met:
1857 -- It is an inner level instantiation (since in this case it was
1858 -- triggered by an outer level call from elaboration code), but
1859 -- only if the instantiation is within the scope of the original
1860 -- outer level call.
1862 -- It is an outer level instantiation from elaboration code, or the
1863 -- instantiated entity is in the same elaboration scope.
1865 -- And in these cases, we will check both the inter-unit case and
1866 -- the intra-unit (within a single unit) case.
1868 C_Scope
:= Current_Scope
;
1870 if Present
(Outer_Scope
) and then Within
(Scope
(Ent
), Outer_Scope
) then
1872 Check_A_Call
(N
, Ent
, Outer_Scope
, Inter_Unit_Only
=> False);
1874 elsif From_Elab_Code
then
1876 Check_A_Call
(N
, Ent
, Standard_Standard
, Inter_Unit_Only
=> False);
1878 elsif Same_Elaboration_Scope
(C_Scope
, Scope
(Ent
)) then
1880 Check_A_Call
(N
, Ent
, Scope
(Ent
), Inter_Unit_Only
=> False);
1882 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode is
1883 -- set, then we will do the check, but only in the inter-unit case (this
1884 -- is to accommodate unguarded elaboration calls from other units in
1885 -- which this same mode is set). We inhibit warnings in this case, since
1886 -- this instantiation is not occurring in elaboration code.
1888 elsif Dynamic_Elaboration_Checks
then
1894 Inter_Unit_Only
=> True,
1895 Generate_Warnings
=> False);
1900 end Check_Elab_Instantiation
;
1902 -------------------------
1903 -- Check_Internal_Call --
1904 -------------------------
1906 procedure Check_Internal_Call
1909 Outer_Scope
: Entity_Id
;
1910 Orig_Ent
: Entity_Id
)
1912 Inst_Case
: constant Boolean := Nkind
(N
) in N_Generic_Instantiation
;
1915 -- If not function or procedure call or instantiation, then ignore
1916 -- call (this happens in some error cases and rewriting cases).
1918 if not Nkind_In
(N
, N_Function_Call
, N_Procedure_Call_Statement
)
1919 and then not Inst_Case
1923 -- Nothing to do if this is a call or instantiation that has already
1924 -- been found to be a sure ABE.
1926 elsif ABE_Is_Certain
(N
) then
1929 -- Nothing to do if errors already detected (avoid cascaded errors)
1931 elsif Serious_Errors_Detected
/= 0 then
1934 -- Nothing to do if not in full analysis mode
1936 elsif not Full_Analysis
then
1939 -- Nothing to do if analyzing in special spec-expression mode, since the
1940 -- call is not actually being made at this time.
1942 elsif In_Spec_Expression
then
1945 -- Nothing to do for call to intrinsic subprogram
1947 elsif Is_Intrinsic_Subprogram
(E
) then
1950 -- No need to trace local calls if checking task activation, because
1951 -- other local bodies are elaborated already.
1953 elsif In_Task_Activation
then
1956 -- Nothing to do if call is within a generic unit
1958 elsif Inside_A_Generic
then
1962 -- Delay this call if we are still delaying calls
1964 if Delaying_Elab_Checks
then
1965 Delay_Check
.Append
(
1968 Orig_Ent
=> Orig_Ent
,
1969 Curscop
=> Current_Scope
,
1970 Outer_Scope
=> Outer_Scope
,
1971 From_Elab_Code
=> From_Elab_Code
));
1974 -- Otherwise, call phase 2 continuation right now
1977 Check_Internal_Call_Continue
(N
, E
, Outer_Scope
, Orig_Ent
);
1979 end Check_Internal_Call
;
1981 ----------------------------------
1982 -- Check_Internal_Call_Continue --
1983 ----------------------------------
1985 procedure Check_Internal_Call_Continue
1988 Outer_Scope
: Entity_Id
;
1989 Orig_Ent
: Entity_Id
)
1991 Loc
: constant Source_Ptr
:= Sloc
(N
);
1992 Inst_Case
: constant Boolean := Is_Generic_Unit
(E
);
1997 function Find_Elab_Reference
(N
: Node_Id
) return Traverse_Result
;
1998 -- Function applied to each node as we traverse the body. Checks for
1999 -- call or entity reference that needs checking, and if so checks it.
2000 -- Always returns OK, so entire tree is traversed, except that as
2001 -- described below subprogram bodies are skipped for now.
2003 procedure Traverse
is new Atree
.Traverse_Proc
(Find_Elab_Reference
);
2004 -- Traverse procedure using above Find_Elab_Reference function
2006 -------------------------
2007 -- Find_Elab_Reference --
2008 -------------------------
2010 function Find_Elab_Reference
(N
: Node_Id
) return Traverse_Result
is
2014 -- If user has specified that there are no entry calls in elaboration
2015 -- code, do not trace past an accept statement, because the rendez-
2016 -- vous will happen after elaboration.
2018 if Nkind_In
(Original_Node
(N
), N_Accept_Statement
,
2020 and then Restriction_Active
(No_Entry_Calls_In_Elaboration_Code
)
2024 -- If we have a function call, check it
2026 elsif Nkind
(N
) = N_Function_Call
then
2027 Check_Elab_Call
(N
, Outer_Scope
);
2030 -- If we have a procedure call, check the call, and also check
2031 -- arguments that are assignments (OUT or IN OUT mode formals).
2033 elsif Nkind
(N
) = N_Procedure_Call_Statement
then
2034 Check_Elab_Call
(N
, Outer_Scope
, In_Init_Proc
=> Is_Init_Proc
(E
));
2036 Actual
:= First_Actual
(N
);
2037 while Present
(Actual
) loop
2038 if Known_To_Be_Assigned
(Actual
) then
2039 Check_Elab_Assign
(Actual
);
2042 Next_Actual
(Actual
);
2047 -- If we have an access attribute for a subprogram, check it.
2048 -- Suppress this behavior under debug flag.
2050 elsif not Debug_Flag_Dot_UU
2051 and then Nkind
(N
) = N_Attribute_Reference
2052 and then Nam_In
(Attribute_Name
(N
), Name_Access
,
2053 Name_Unrestricted_Access
)
2054 and then Is_Entity_Name
(Prefix
(N
))
2055 and then Is_Subprogram
(Entity
(Prefix
(N
)))
2057 Check_Elab_Call
(N
, Outer_Scope
);
2060 -- If we have a generic instantiation, check it
2062 elsif Nkind
(N
) in N_Generic_Instantiation
then
2063 Check_Elab_Instantiation
(N
, Outer_Scope
);
2066 -- Skip subprogram bodies that come from source (wait for call to
2067 -- analyze these). The reason for the come from source test is to
2068 -- avoid catching task bodies.
2070 -- For task bodies, we should really avoid these too, waiting for the
2071 -- task activation, but that's too much trouble to catch for now, so
2072 -- we go in unconditionally. This is not so terrible, it means the
2073 -- error backtrace is not quite complete, and we are too eager to
2074 -- scan bodies of tasks that are unused, but this is hardly very
2077 elsif Nkind
(N
) = N_Subprogram_Body
2078 and then Comes_From_Source
(N
)
2082 elsif Nkind
(N
) = N_Assignment_Statement
2083 and then Comes_From_Source
(N
)
2085 Check_Elab_Assign
(Name
(N
));
2091 end Find_Elab_Reference
;
2093 -- Start of processing for Check_Internal_Call_Continue
2096 -- Save outer level call if at outer level
2098 if Elab_Call
.Last
= 0 then
2099 Outer_Level_Sloc
:= Loc
;
2102 Elab_Visited
.Append
(E
);
2104 -- If the call is to a function that renames a literal, no check needed
2106 if Ekind
(E
) = E_Enumeration_Literal
then
2110 Sbody
:= Unit_Declaration_Node
(E
);
2112 if not Nkind_In
(Sbody
, N_Subprogram_Body
, N_Package_Body
) then
2113 Ebody
:= Corresponding_Body
(Sbody
);
2118 Sbody
:= Unit_Declaration_Node
(Ebody
);
2122 -- If the body appears after the outer level call or instantiation then
2123 -- we have an error case handled below.
2125 if Earlier_In_Extended_Unit
(Outer_Level_Sloc
, Sloc
(Sbody
))
2126 and then not In_Task_Activation
2130 -- If we have the instantiation case we are done, since we now
2131 -- know that the body of the generic appeared earlier.
2133 elsif Inst_Case
then
2136 -- Otherwise we have a call, so we trace through the called body to see
2137 -- if it has any problems.
2140 pragma Assert
(Nkind
(Sbody
) = N_Subprogram_Body
);
2142 Elab_Call
.Append
((Cloc
=> Loc
, Ent
=> E
));
2144 if Debug_Flag_LL
then
2145 Write_Str
("Elab_Call.Last = ");
2146 Write_Int
(Int
(Elab_Call
.Last
));
2147 Write_Str
(" Ent = ");
2148 Write_Name
(Chars
(E
));
2150 Write_Location
(Sloc
(N
));
2154 -- Now traverse declarations and statements of subprogram body. Note
2155 -- that we cannot simply Traverse (Sbody), since traverse does not
2156 -- normally visit subprogram bodies.
2161 Decl
:= First
(Declarations
(Sbody
));
2162 while Present
(Decl
) loop
2168 Traverse
(Handled_Statement_Sequence
(Sbody
));
2170 Elab_Call
.Decrement_Last
;
2174 -- Here is the case of calling a subprogram where the body has not yet
2175 -- been encountered. A warning message is needed, except if this is the
2176 -- case of appearing within an aspect specification that results in
2177 -- a check call, we do not really have such a situation, so no warning
2178 -- is needed (e.g. the case of a precondition, where the call appears
2179 -- textually before the body, but in actual fact is moved to the
2180 -- appropriate subprogram body and so does not need a check).
2189 -- Keep looking at parents if we are still in the subexpression
2191 if Nkind
(P
) in N_Subexpr
then
2194 -- Here P is the parent of the expression, check for special case
2197 O
:= Original_Node
(P
);
2199 -- Definitely not the special case if orig node is not a pragma
2201 exit when Nkind
(O
) /= N_Pragma
;
2203 -- Check we have an If statement or a null statement (happens
2204 -- when the If has been expanded to be True).
2206 exit when not Nkind_In
(P
, N_If_Statement
, N_Null_Statement
);
2208 -- Our special case will be indicated either by the pragma
2209 -- coming from an aspect ...
2211 if Present
(Corresponding_Aspect
(O
)) then
2214 -- Or, in the case of an initial condition, specifically by a
2215 -- Check pragma specifying an Initial_Condition check.
2217 elsif Pragma_Name
(O
) = Name_Check
2220 (Expression
(First
(Pragma_Argument_Associations
(O
)))) =
2221 Name_Initial_Condition
2225 -- For anything else, we have an error
2234 -- Not that special case, warning and dynamic check is required
2236 -- If we have nothing in the call stack, then this is at the outer
2237 -- level, and the ABE is bound to occur.
2239 if Elab_Call
.Last
= 0 then
2240 Error_Msg_Warn
:= SPARK_Mode
/= On
;
2244 ("cannot instantiate& before body seen<<", N
, Orig_Ent
);
2247 ("cannot call& before body seen<<", N
, Orig_Ent
);
2250 Error_Msg_N
("\Program_Error [<<", N
);
2251 Insert_Elab_Check
(N
);
2253 -- Call is not at outer level
2256 -- Deal with dynamic elaboration check
2258 if not Elaboration_Checks_Suppressed
(E
) then
2259 Set_Elaboration_Entity_Required
(E
);
2261 -- Case of no elaboration entity allocated yet
2263 if No
(Elaboration_Entity
(E
)) then
2265 -- Create object declaration for elaboration entity, and put it
2266 -- just in front of the spec of the subprogram or generic unit,
2267 -- in the same scope as this unit. The subprogram may be over-
2268 -- loaded, so make the name of elaboration entity unique by
2269 -- means of a numeric suffix.
2272 Loce
: constant Source_Ptr
:= Sloc
(E
);
2273 Ent
: constant Entity_Id
:=
2274 Make_Defining_Identifier
(Loc
,
2275 Chars
=> New_External_Name
(Chars
(E
), 'E', -1));
2278 Set_Elaboration_Entity
(E
, Ent
);
2279 Push_Scope
(Scope
(E
));
2281 Insert_Action
(Declaration_Node
(E
),
2282 Make_Object_Declaration
(Loce
,
2283 Defining_Identifier
=> Ent
,
2284 Object_Definition
=>
2285 New_Occurrence_Of
(Standard_Short_Integer
, Loce
),
2287 Make_Integer_Literal
(Loc
, Uint_0
)));
2289 -- Set elaboration flag at the point of the body
2291 Set_Elaboration_Flag
(Sbody
, E
);
2293 -- Kill current value indication. This is necessary because
2294 -- the tests of this flag are inserted out of sequence and
2295 -- must not pick up bogus indications of the wrong constant
2296 -- value. Also, this is never a true constant, since one way
2297 -- or another, it gets reset.
2299 Set_Current_Value
(Ent
, Empty
);
2300 Set_Last_Assignment
(Ent
, Empty
);
2301 Set_Is_True_Constant
(Ent
, False);
2306 -- Generate check of the elaboration counter
2308 Insert_Elab_Check
(N
,
2309 Make_Attribute_Reference
(Loc
,
2310 Attribute_Name
=> Name_Elaborated
,
2311 Prefix
=> New_Occurrence_Of
(E
, Loc
)));
2314 -- Generate the warning
2316 if not Suppress_Elaboration_Warnings
(E
)
2317 and then not Elaboration_Checks_Suppressed
(E
)
2319 -- Suppress this warning if we have a function call that occurred
2320 -- within an assertion expression, since we can get false warnings
2321 -- in this case, due to the out of order handling in this case.
2324 (Nkind
(Original_Node
(N
)) /= N_Function_Call
2325 or else not In_Assertion_Expression_Pragma
(Original_Node
(N
)))
2327 Error_Msg_Warn
:= SPARK_Mode
/= On
;
2331 ("instantiation of& may occur before body is seen<l<",
2335 ("call to& may occur before body is seen<l<", N
, Orig_Ent
);
2338 Error_Msg_N
("\Program_Error ]<l<", N
);
2340 -- There is no need to query the elaboration warning message flags
2341 -- because the main message is an error, not a warning, therefore
2342 -- all the clarification messages produces by Output_Calls must be
2343 -- emitted unconditionally.
2345 Output_Calls
(N
, Check_Elab_Flag
=> False);
2349 -- Set flag to suppress further warnings on same subprogram
2350 -- unless in all errors mode
2352 if not All_Errors_Mode
then
2353 Set_Suppress_Elaboration_Warnings
(E
);
2355 end Check_Internal_Call_Continue
;
2357 ---------------------------
2358 -- Check_Task_Activation --
2359 ---------------------------
2361 procedure Check_Task_Activation
(N
: Node_Id
) is
2362 Loc
: constant Source_Ptr
:= Sloc
(N
);
2363 Inter_Procs
: constant Elist_Id
:= New_Elmt_List
;
2364 Intra_Procs
: constant Elist_Id
:= New_Elmt_List
;
2367 Task_Scope
: Entity_Id
;
2368 Cunit_SC
: Boolean := False;
2371 Enclosing
: Entity_Id
;
2373 procedure Add_Task_Proc
(Typ
: Entity_Id
);
2374 -- Add to Task_Procs the task body procedure(s) of task types in Typ.
2375 -- For record types, this procedure recurses over component types.
2377 procedure Collect_Tasks
(Decls
: List_Id
);
2378 -- Collect the types of the tasks that are to be activated in the given
2379 -- list of declarations, in order to perform elaboration checks on the
2380 -- corresponding task procedures which are called implicitly here.
2382 function Outer_Unit
(E
: Entity_Id
) return Entity_Id
;
2383 -- find enclosing compilation unit of Entity, ignoring subunits, or
2384 -- else enclosing subprogram. If E is not a package, there is no need
2385 -- for inter-unit elaboration checks.
2391 procedure Add_Task_Proc
(Typ
: Entity_Id
) is
2393 Proc
: Entity_Id
:= Empty
;
2396 if Is_Task_Type
(Typ
) then
2397 Proc
:= Get_Task_Body_Procedure
(Typ
);
2399 elsif Is_Array_Type
(Typ
)
2400 and then Has_Task
(Base_Type
(Typ
))
2402 Add_Task_Proc
(Component_Type
(Typ
));
2404 elsif Is_Record_Type
(Typ
)
2405 and then Has_Task
(Base_Type
(Typ
))
2407 Comp
:= First_Component
(Typ
);
2408 while Present
(Comp
) loop
2409 Add_Task_Proc
(Etype
(Comp
));
2410 Comp
:= Next_Component
(Comp
);
2414 -- If the task type is another unit, we will perform the usual
2415 -- elaboration check on its enclosing unit. If the type is in the
2416 -- same unit, we can trace the task body as for an internal call,
2417 -- but we only need to examine other external calls, because at
2418 -- the point the task is activated, internal subprogram bodies
2419 -- will have been elaborated already. We keep separate lists for
2420 -- each kind of task.
2422 -- Skip this test if errors have occurred, since in this case
2423 -- we can get false indications.
2425 if Serious_Errors_Detected
/= 0 then
2429 if Present
(Proc
) then
2430 if Outer_Unit
(Scope
(Proc
)) = Enclosing
then
2432 if No
(Corresponding_Body
(Unit_Declaration_Node
(Proc
)))
2434 (not Is_Generic_Instance
(Scope
(Proc
))
2435 or else Scope
(Proc
) = Scope
(Defining_Identifier
(Decl
)))
2437 Error_Msg_Warn
:= SPARK_Mode
/= On
;
2439 ("task will be activated before elaboration of its body<<",
2441 Error_Msg_N
("\Program_Error [<<", Decl
);
2444 (Corresponding_Body
(Unit_Declaration_Node
(Proc
)))
2446 Append_Elmt
(Proc
, Intra_Procs
);
2450 -- No need for multiple entries of the same type
2452 Elmt
:= First_Elmt
(Inter_Procs
);
2453 while Present
(Elmt
) loop
2454 if Node
(Elmt
) = Proc
then
2461 Append_Elmt
(Proc
, Inter_Procs
);
2470 procedure Collect_Tasks
(Decls
: List_Id
) is
2472 if Present
(Decls
) then
2473 Decl
:= First
(Decls
);
2474 while Present
(Decl
) loop
2475 if Nkind
(Decl
) = N_Object_Declaration
2476 and then Has_Task
(Etype
(Defining_Identifier
(Decl
)))
2478 Add_Task_Proc
(Etype
(Defining_Identifier
(Decl
)));
2490 function Outer_Unit
(E
: Entity_Id
) return Entity_Id
is
2495 while Present
(Outer
) loop
2496 if Elaboration_Checks_Suppressed
(Outer
) then
2500 exit when Is_Child_Unit
(Outer
)
2501 or else Scope
(Outer
) = Standard_Standard
2502 or else Ekind
(Outer
) /= E_Package
;
2503 Outer
:= Scope
(Outer
);
2509 -- Start of processing for Check_Task_Activation
2512 Enclosing
:= Outer_Unit
(Current_Scope
);
2514 -- Find all tasks declared in the current unit
2516 if Nkind
(N
) = N_Package_Body
then
2517 P
:= Unit_Declaration_Node
(Corresponding_Spec
(N
));
2519 Collect_Tasks
(Declarations
(N
));
2520 Collect_Tasks
(Visible_Declarations
(Specification
(P
)));
2521 Collect_Tasks
(Private_Declarations
(Specification
(P
)));
2523 elsif Nkind
(N
) = N_Package_Declaration
then
2524 Collect_Tasks
(Visible_Declarations
(Specification
(N
)));
2525 Collect_Tasks
(Private_Declarations
(Specification
(N
)));
2528 Collect_Tasks
(Declarations
(N
));
2531 -- We only perform detailed checks in all tasks that are library level
2532 -- entities. If the master is a subprogram or task, activation will
2533 -- depend on the activation of the master itself.
2535 -- Should dynamic checks be added in the more general case???
2537 if Ekind
(Enclosing
) /= E_Package
then
2541 -- For task types defined in other units, we want the unit containing
2542 -- the task body to be elaborated before the current one.
2544 Elmt
:= First_Elmt
(Inter_Procs
);
2545 while Present
(Elmt
) loop
2547 Task_Scope
:= Outer_Unit
(Scope
(Ent
));
2549 if not Is_Compilation_Unit
(Task_Scope
) then
2552 elsif Suppress_Elaboration_Warnings
(Task_Scope
)
2553 or else Elaboration_Checks_Suppressed
(Task_Scope
)
2557 elsif Dynamic_Elaboration_Checks
then
2558 if not Elaboration_Checks_Suppressed
(Ent
)
2559 and then not Cunit_SC
2561 not Restriction_Active
(No_Entry_Calls_In_Elaboration_Code
)
2563 -- Runtime elaboration check required. Generate check of the
2564 -- elaboration counter for the unit containing the entity.
2566 Insert_Elab_Check
(N
,
2567 Make_Attribute_Reference
(Loc
,
2568 Attribute_Name
=> Name_Elaborated
,
2570 New_Occurrence_Of
(Spec_Entity
(Task_Scope
), Loc
)));
2574 -- Force the binder to elaborate other unit first
2576 if not Suppress_Elaboration_Warnings
(Ent
)
2577 and then not Elaboration_Checks_Suppressed
(Ent
)
2578 and then Elab_Info_Messages
2579 and then not Suppress_Elaboration_Warnings
(Task_Scope
)
2580 and then not Elaboration_Checks_Suppressed
(Task_Scope
)
2582 Error_Msg_Node_2
:= Task_Scope
;
2584 ("info: activation of an instance of task type&" &
2585 " requires pragma Elaborate_All on &?$?", N
, Ent
);
2588 Activate_Elaborate_All_Desirable
(N
, Task_Scope
);
2589 Set_Suppress_Elaboration_Warnings
(Task_Scope
);
2595 -- For tasks declared in the current unit, trace other calls within
2596 -- the task procedure bodies, which are available.
2598 In_Task_Activation
:= True;
2600 Elmt
:= First_Elmt
(Intra_Procs
);
2601 while Present
(Elmt
) loop
2603 Check_Internal_Call_Continue
(N
, Ent
, Enclosing
, Ent
);
2607 In_Task_Activation
:= False;
2608 end Check_Task_Activation
;
2610 -------------------------------
2611 -- Is_Call_Of_Generic_Formal --
2612 -------------------------------
2614 function Is_Call_Of_Generic_Formal
(N
: Node_Id
) return Boolean is
2616 return Nkind_In
(N
, N_Function_Call
, N_Procedure_Call_Statement
)
2618 -- Always return False if debug flag -gnatd.G is set
2620 and then not Debug_Flag_Dot_GG
2622 -- For now, we detect this by looking for the strange identifier
2623 -- node, whose Chars reflect the name of the generic formal, but
2624 -- the Chars of the Entity references the generic actual.
2626 and then Nkind
(Name
(N
)) = N_Identifier
2627 and then Chars
(Name
(N
)) /= Chars
(Entity
(Name
(N
)));
2628 end Is_Call_Of_Generic_Formal
;
2630 --------------------------------
2631 -- Set_Elaboration_Constraint --
2632 --------------------------------
2634 procedure Set_Elaboration_Constraint
2639 Elab_Unit
: Entity_Id
;
2641 -- Check whether this is a call to an Initialize subprogram for a
2642 -- controlled type. Note that Call can also be a 'Access attribute
2643 -- reference, which now generates an elaboration check.
2645 Init_Call
: constant Boolean :=
2646 Nkind
(Call
) = N_Procedure_Call_Statement
2647 and then Chars
(Subp
) = Name_Initialize
2648 and then Comes_From_Source
(Subp
)
2649 and then Present
(Parameter_Associations
(Call
))
2650 and then Is_Controlled
(Etype
(First_Actual
(Call
)));
2652 -- If the unit is mentioned in a with_clause of the current unit, it is
2653 -- visible, and we can set the elaboration flag.
2655 if Is_Immediately_Visible
(Scop
)
2656 or else (Is_Child_Unit
(Scop
) and then Is_Visible_Lib_Unit
(Scop
))
2658 Activate_Elaborate_All_Desirable
(Call
, Scop
);
2659 Set_Suppress_Elaboration_Warnings
(Scop
, True);
2663 -- If this is not an initialization call or a call using object notation
2664 -- we know that the unit of the called entity is in the context, and
2665 -- we can set the flag as well. The unit need not be visible if the call
2666 -- occurs within an instantiation.
2668 if Is_Init_Proc
(Subp
)
2670 or else Nkind
(Original_Node
(Call
)) = N_Selected_Component
2672 null; -- detailed processing follows.
2675 Activate_Elaborate_All_Desirable
(Call
, Scop
);
2676 Set_Suppress_Elaboration_Warnings
(Scop
, True);
2680 -- If the unit is not in the context, there must be an intermediate unit
2681 -- that is, on which we need to place to elaboration flag. This happens
2682 -- with init proc calls.
2684 if Is_Init_Proc
(Subp
) or else Init_Call
then
2686 -- The initialization call is on an object whose type is not declared
2687 -- in the same scope as the subprogram. The type of the object must
2688 -- be a subtype of the type of operation. This object is the first
2689 -- actual in the call.
2692 Typ
: constant Entity_Id
:=
2693 Etype
(First
(Parameter_Associations
(Call
)));
2695 Elab_Unit
:= Scope
(Typ
);
2696 while (Present
(Elab_Unit
))
2697 and then not Is_Compilation_Unit
(Elab_Unit
)
2699 Elab_Unit
:= Scope
(Elab_Unit
);
2703 -- If original node uses selected component notation, the prefix is
2704 -- visible and determines the scope that must be elaborated. After
2705 -- rewriting, the prefix is the first actual in the call.
2707 elsif Nkind
(Original_Node
(Call
)) = N_Selected_Component
then
2708 Elab_Unit
:= Scope
(Etype
(First
(Parameter_Associations
(Call
))));
2710 -- Not one of special cases above
2713 -- Using previously computed scope. If the elaboration check is
2714 -- done after analysis, the scope is not visible any longer, but
2715 -- must still be in the context.
2720 Activate_Elaborate_All_Desirable
(Call
, Elab_Unit
);
2721 Set_Suppress_Elaboration_Warnings
(Elab_Unit
, True);
2722 end Set_Elaboration_Constraint
;
2724 ------------------------
2725 -- Get_Referenced_Ent --
2726 ------------------------
2728 function Get_Referenced_Ent
(N
: Node_Id
) return Entity_Id
is
2732 if Nkind
(N
) = N_Attribute_Reference
then
2740 elsif Nkind
(Nam
) = N_Selected_Component
then
2741 return Entity
(Selector_Name
(Nam
));
2742 elsif not Is_Entity_Name
(Nam
) then
2745 return Entity
(Nam
);
2747 end Get_Referenced_Ent
;
2749 ----------------------
2750 -- Has_Generic_Body --
2751 ----------------------
2753 function Has_Generic_Body
(N
: Node_Id
) return Boolean is
2754 Ent
: constant Entity_Id
:= Get_Generic_Entity
(N
);
2755 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Ent
);
2758 function Find_Body_In
(E
: Entity_Id
; N
: Node_Id
) return Node_Id
;
2759 -- Determine if the list of nodes headed by N and linked by Next
2760 -- contains a package body for the package spec entity E, and if so
2761 -- return the package body. If not, then returns Empty.
2763 function Load_Package_Body
(Nam
: Unit_Name_Type
) return Node_Id
;
2764 -- This procedure is called load the unit whose name is given by Nam.
2765 -- This unit is being loaded to see whether it contains an optional
2766 -- generic body. The returned value is the loaded unit, which is always
2767 -- a package body (only package bodies can contain other entities in the
2768 -- sense in which Has_Generic_Body is interested). We only attempt to
2769 -- load bodies if we are generating code. If we are in semantics check
2770 -- only mode, then it would be wrong to load bodies that are not
2771 -- required from a semantic point of view, so in this case we return
2772 -- Empty. The result is that the caller may incorrectly decide that a
2773 -- generic spec does not have a body when in fact it does, but the only
2774 -- harm in this is that some warnings on elaboration problems may be
2775 -- lost in semantic checks only mode, which is not big loss. We also
2776 -- return Empty if we go for a body and it is not there.
2778 function Locate_Corresponding_Body
(PE
: Entity_Id
) return Node_Id
;
2779 -- PE is the entity for a package spec. This function locates the
2780 -- corresponding package body, returning Empty if none is found. The
2781 -- package body returned is fully parsed but may not yet be analyzed,
2782 -- so only syntactic fields should be referenced.
2788 function Find_Body_In
(E
: Entity_Id
; N
: Node_Id
) return Node_Id
is
2793 while Present
(Nod
) loop
2795 -- If we found the package body we are looking for, return it
2797 if Nkind
(Nod
) = N_Package_Body
2798 and then Chars
(Defining_Unit_Name
(Nod
)) = Chars
(E
)
2802 -- If we found the stub for the body, go after the subunit,
2803 -- loading it if necessary.
2805 elsif Nkind
(Nod
) = N_Package_Body_Stub
2806 and then Chars
(Defining_Identifier
(Nod
)) = Chars
(E
)
2808 if Present
(Library_Unit
(Nod
)) then
2809 return Unit
(Library_Unit
(Nod
));
2812 return Load_Package_Body
(Get_Unit_Name
(Nod
));
2815 -- If neither package body nor stub, keep looking on chain
2825 -----------------------
2826 -- Load_Package_Body --
2827 -----------------------
2829 function Load_Package_Body
(Nam
: Unit_Name_Type
) return Node_Id
is
2830 U
: Unit_Number_Type
;
2833 if Operating_Mode
/= Generate_Code
then
2846 return Unit
(Cunit
(U
));
2849 end Load_Package_Body
;
2851 -------------------------------
2852 -- Locate_Corresponding_Body --
2853 -------------------------------
2855 function Locate_Corresponding_Body
(PE
: Entity_Id
) return Node_Id
is
2856 Spec
: constant Node_Id
:= Declaration_Node
(PE
);
2857 Decl
: constant Node_Id
:= Parent
(Spec
);
2858 Scop
: constant Entity_Id
:= Scope
(PE
);
2862 if Is_Library_Level_Entity
(PE
) then
2864 -- If package is a library unit that requires a body, we have no
2865 -- choice but to go after that body because it might contain an
2866 -- optional body for the original generic package.
2868 if Unit_Requires_Body
(PE
) then
2870 -- Load the body. Note that we are a little careful here to use
2871 -- Spec to get the unit number, rather than PE or Decl, since
2872 -- in the case where the package is itself a library level
2873 -- instantiation, Spec will properly reference the generic
2874 -- template, which is what we really want.
2878 (Get_Body_Name
(Unit_Name
(Get_Source_Unit
(Spec
))));
2880 -- But if the package is a library unit that does NOT require
2881 -- a body, then no body is permitted, so we are sure that there
2882 -- is no body for the original generic package.
2888 -- Otherwise look and see if we are embedded in a further package
2890 elsif Is_Package_Or_Generic_Package
(Scop
) then
2892 -- If so, get the body of the enclosing package, and look in
2893 -- its package body for the package body we are looking for.
2895 PBody
:= Locate_Corresponding_Body
(Scop
);
2900 return Find_Body_In
(PE
, First
(Declarations
(PBody
)));
2903 -- If we are not embedded in a further package, then the body
2904 -- must be in the same declarative part as we are.
2907 return Find_Body_In
(PE
, Next
(Decl
));
2909 end Locate_Corresponding_Body
;
2911 -- Start of processing for Has_Generic_Body
2914 if Present
(Corresponding_Body
(Decl
)) then
2917 elsif Unit_Requires_Body
(Ent
) then
2920 -- Compilation units cannot have optional bodies
2922 elsif Is_Compilation_Unit
(Ent
) then
2925 -- Otherwise look at what scope we are in
2928 Scop
:= Scope
(Ent
);
2930 -- Case of entity is in other than a package spec, in this case
2931 -- the body, if present, must be in the same declarative part.
2933 if not Is_Package_Or_Generic_Package
(Scop
) then
2938 -- Declaration node may get us a spec, so if so, go to
2939 -- the parent declaration.
2941 P
:= Declaration_Node
(Ent
);
2942 while not Is_List_Member
(P
) loop
2946 return Present
(Find_Body_In
(Ent
, Next
(P
)));
2949 -- If the entity is in a package spec, then we have to locate
2950 -- the corresponding package body, and look there.
2954 PBody
: constant Node_Id
:= Locate_Corresponding_Body
(Scop
);
2962 (Find_Body_In
(Ent
, (First
(Declarations
(PBody
)))));
2967 end Has_Generic_Body
;
2969 -----------------------
2970 -- Insert_Elab_Check --
2971 -----------------------
2973 procedure Insert_Elab_Check
(N
: Node_Id
; C
: Node_Id
:= Empty
) is
2975 Loc
: constant Source_Ptr
:= Sloc
(N
);
2978 -- The check (N_Raise_Program_Error) node to be inserted
2981 -- If expansion is disabled, do not generate any checks. Also
2982 -- skip checks if any subunits are missing because in either
2983 -- case we lack the full information that we need, and no object
2984 -- file will be created in any case.
2986 if not Expander_Active
or else Subunits_Missing
then
2990 -- If we have a generic instantiation, where Instance_Spec is set,
2991 -- then this field points to a generic instance spec that has
2992 -- been inserted before the instantiation node itself, so that
2993 -- is where we want to insert a check.
2995 if Nkind
(N
) in N_Generic_Instantiation
2996 and then Present
(Instance_Spec
(N
))
2998 Nod
:= Instance_Spec
(N
);
3003 -- Build check node, possibly with condition
3006 Make_Raise_Program_Error
(Loc
, Reason
=> PE_Access_Before_Elaboration
);
3009 Set_Condition
(Chk
, Make_Op_Not
(Loc
, Right_Opnd
=> C
));
3012 -- If we are inserting at the top level, insert in Aux_Decls
3014 if Nkind
(Parent
(Nod
)) = N_Compilation_Unit
then
3016 ADN
: constant Node_Id
:= Aux_Decls_Node
(Parent
(Nod
));
3019 if No
(Declarations
(ADN
)) then
3020 Set_Declarations
(ADN
, New_List
(Chk
));
3022 Append_To
(Declarations
(ADN
), Chk
);
3028 -- Otherwise just insert as an action on the node in question
3031 Insert_Action
(Nod
, Chk
);
3033 end Insert_Elab_Check
;
3035 -------------------------------
3036 -- Is_Finalization_Procedure --
3037 -------------------------------
3039 function Is_Finalization_Procedure
(Id
: Entity_Id
) return Boolean is
3041 -- Check whether Id is a procedure with at least one parameter
3043 if Ekind
(Id
) = E_Procedure
and then Present
(First_Formal
(Id
)) then
3045 Typ
: constant Entity_Id
:= Etype
(First_Formal
(Id
));
3046 Deep_Fin
: Entity_Id
:= Empty
;
3047 Fin
: Entity_Id
:= Empty
;
3050 -- If the type of the first formal does not require finalization
3051 -- actions, then this is definitely not [Deep_]Finalize.
3053 if not Needs_Finalization
(Typ
) then
3057 -- At this point we have the following scenario:
3059 -- procedure Name (Param1 : [in] [out] Ctrl[; Param2 : ...]);
3061 -- Recover the two possible versions of [Deep_]Finalize using the
3062 -- type of the first parameter and compare with the input.
3064 Deep_Fin
:= TSS
(Typ
, TSS_Deep_Finalize
);
3066 if Is_Controlled
(Typ
) then
3067 Fin
:= Find_Prim_Op
(Typ
, Name_Finalize
);
3070 return (Present
(Deep_Fin
) and then Id
= Deep_Fin
)
3071 or else (Present
(Fin
) and then Id
= Fin
);
3076 end Is_Finalization_Procedure
;
3082 procedure Output_Calls
3084 Check_Elab_Flag
: Boolean)
3086 function Emit
(Flag
: Boolean) return Boolean;
3087 -- Determine whether to emit an error message based on the combination
3088 -- of flags Check_Elab_Flag and Flag.
3090 function Is_Printable_Error_Name
(Nm
: Name_Id
) return Boolean;
3091 -- An internal function, used to determine if a name, Nm, is either
3092 -- a non-internal name, or is an internal name that is printable
3093 -- by the error message circuits (i.e. it has a single upper
3094 -- case letter at the end).
3100 function Emit
(Flag
: Boolean) return Boolean is
3102 if Check_Elab_Flag
then
3109 -----------------------------
3110 -- Is_Printable_Error_Name --
3111 -----------------------------
3113 function Is_Printable_Error_Name
(Nm
: Name_Id
) return Boolean is
3115 if not Is_Internal_Name
(Nm
) then
3118 elsif Name_Len
= 1 then
3122 Name_Len
:= Name_Len
- 1;
3123 return not Is_Internal_Name
;
3125 end Is_Printable_Error_Name
;
3131 -- Start of processing for Output_Calls
3134 for J
in reverse 1 .. Elab_Call
.Last
loop
3135 Error_Msg_Sloc
:= Elab_Call
.Table
(J
).Cloc
;
3137 Ent
:= Elab_Call
.Table
(J
).Ent
;
3139 -- Dynamic elaboration model, warnings controlled by -gnatwl
3141 if Dynamic_Elaboration_Checks
then
3142 if Emit
(Elab_Warnings
) then
3143 if Is_Generic_Unit
(Ent
) then
3144 Error_Msg_NE
("\\?l?& instantiated #", N
, Ent
);
3145 elsif Is_Init_Proc
(Ent
) then
3146 Error_Msg_N
("\\?l?initialization procedure called #", N
);
3147 elsif Is_Printable_Error_Name
(Chars
(Ent
)) then
3148 Error_Msg_NE
("\\?l?& called #", N
, Ent
);
3150 Error_Msg_N
("\\?l?called #", N
);
3154 -- Static elaboration model, info messages controlled by -gnatel
3157 if Emit
(Elab_Info_Messages
) then
3158 if Is_Generic_Unit
(Ent
) then
3159 Error_Msg_NE
("\\?$?& instantiated #", N
, Ent
);
3160 elsif Is_Init_Proc
(Ent
) then
3161 Error_Msg_N
("\\?$?initialization procedure called #", N
);
3162 elsif Is_Printable_Error_Name
(Chars
(Ent
)) then
3163 Error_Msg_NE
("\\?$?& called #", N
, Ent
);
3165 Error_Msg_N
("\\?$?called #", N
);
3172 ----------------------------
3173 -- Same_Elaboration_Scope --
3174 ----------------------------
3176 function Same_Elaboration_Scope
(Scop1
, Scop2
: Entity_Id
) return Boolean is
3181 -- Find elaboration scope for Scop1
3182 -- This is either a subprogram or a compilation unit.
3185 while S1
/= Standard_Standard
3186 and then not Is_Compilation_Unit
(S1
)
3187 and then Ekind_In
(S1
, E_Package
, E_Protected_Type
, E_Block
)
3192 -- Find elaboration scope for Scop2
3195 while S2
/= Standard_Standard
3196 and then not Is_Compilation_Unit
(S2
)
3197 and then Ekind_In
(S2
, E_Package
, E_Protected_Type
, E_Block
)
3203 end Same_Elaboration_Scope
;
3209 procedure Set_C_Scope
is
3211 while not Is_Compilation_Unit
(C_Scope
) loop
3212 C_Scope
:= Scope
(C_Scope
);
3220 function Spec_Entity
(E
: Entity_Id
) return Entity_Id
is
3224 -- Check for case of body entity
3225 -- Why is the check for E_Void needed???
3227 if Ekind_In
(E
, E_Void
, E_Subprogram_Body
, E_Package_Body
) then
3231 Decl
:= Parent
(Decl
);
3232 exit when Nkind
(Decl
) in N_Proper_Body
;
3235 return Corresponding_Spec
(Decl
);
3246 procedure Supply_Bodies
(N
: Node_Id
) is
3248 if Nkind
(N
) = N_Subprogram_Declaration
then
3250 Ent
: constant Entity_Id
:= Defining_Unit_Name
(Specification
(N
));
3253 -- Internal subprograms will already have a generated body, so
3254 -- there is no need to provide a stub for them.
3256 if No
(Corresponding_Body
(N
)) then
3258 Loc
: constant Source_Ptr
:= Sloc
(N
);
3260 Formals
: constant List_Id
:= Copy_Parameter_List
(Ent
);
3261 Nam
: constant Entity_Id
:=
3262 Make_Defining_Identifier
(Loc
, Chars
(Ent
));
3264 Stats
: constant List_Id
:=
3266 (Make_Raise_Program_Error
(Loc
,
3267 Reason
=> PE_Access_Before_Elaboration
));
3270 if Ekind
(Ent
) = E_Function
then
3272 Make_Function_Specification
(Loc
,
3273 Defining_Unit_Name
=> Nam
,
3274 Parameter_Specifications
=> Formals
,
3275 Result_Definition
=>
3277 (Result_Definition
(Specification
(N
))));
3279 -- We cannot reliably make a return statement for this
3280 -- body, but none is needed because the call raises
3283 Set_Return_Present
(Ent
);
3287 Make_Procedure_Specification
(Loc
,
3288 Defining_Unit_Name
=> Nam
,
3289 Parameter_Specifications
=> Formals
);
3292 B
:= Make_Subprogram_Body
(Loc
,
3293 Specification
=> Spec
,
3294 Declarations
=> New_List
,
3295 Handled_Statement_Sequence
=>
3296 Make_Handled_Sequence_Of_Statements
(Loc
, Stats
));
3297 Insert_After
(N
, B
);
3303 elsif Nkind
(N
) = N_Package_Declaration
then
3305 Spec
: constant Node_Id
:= Specification
(N
);
3307 Push_Scope
(Defining_Unit_Name
(Spec
));
3308 Supply_Bodies
(Visible_Declarations
(Spec
));
3309 Supply_Bodies
(Private_Declarations
(Spec
));
3315 procedure Supply_Bodies
(L
: List_Id
) is
3320 while Present
(Elmt
) loop
3321 Supply_Bodies
(Elmt
);
3331 function Within
(E1
, E2
: Entity_Id
) return Boolean is
3338 elsif Scop
= Standard_Standard
then
3341 Scop
:= Scope
(Scop
);
3346 --------------------------
3347 -- Within_Elaborate_All --
3348 --------------------------
3350 function Within_Elaborate_All
3351 (Unit
: Unit_Number_Type
;
3352 E
: Entity_Id
) return Boolean
3354 type Unit_Number_Set
is array (Main_Unit
.. Last_Unit
) of Boolean;
3355 pragma Pack
(Unit_Number_Set
);
3357 Seen
: Unit_Number_Set
:= (others => False);
3358 -- Seen (X) is True after we have seen unit X in the walk. This is used
3359 -- to prevent processing the same unit more than once.
3361 Result
: Boolean := False;
3363 procedure Helper
(Unit
: Unit_Number_Type
);
3364 -- This helper procedure does all the work for Within_Elaborate_All. It
3365 -- walks the dependency graph, and sets Result to True if it finds an
3366 -- appropriate Elaborate_All.
3372 procedure Helper
(Unit
: Unit_Number_Type
) is
3373 CU
: constant Node_Id
:= Cunit
(Unit
);
3377 Elab_Id
: Entity_Id
;
3384 Seen
(Unit
) := True;
3387 -- First, check for Elaborate_Alls on this unit
3389 Item
:= First
(Context_Items
(CU
));
3390 while Present
(Item
) loop
3391 if Nkind
(Item
) = N_Pragma
3392 and then Pragma_Name
(Item
) = Name_Elaborate_All
3394 -- Return if some previous error on the pragma itself. The
3395 -- pragma may be unanalyzed, because of a previous error, or
3396 -- if it is the context of a subunit, inherited by its parent.
3398 if Error_Posted
(Item
) or else not Analyzed
(Item
) then
3404 (Expression
(First
(Pragma_Argument_Associations
(Item
))));
3411 Par
:= Parent
(Unit_Declaration_Node
(Elab_Id
));
3413 Item2
:= First
(Context_Items
(Par
));
3414 while Present
(Item2
) loop
3415 if Nkind
(Item2
) = N_With_Clause
3416 and then Entity
(Name
(Item2
)) = E
3417 and then not Limited_Present
(Item2
)
3430 -- Second, recurse on with's. We could do this as part of the above
3431 -- loop, but it's probably more efficient to have two loops, because
3432 -- the relevant Elaborate_All is likely to be on the initial unit. In
3433 -- other words, we're walking the with's breadth-first. This part is
3434 -- only necessary in the dynamic elaboration model.
3436 if Dynamic_Elaboration_Checks
then
3437 Item
:= First
(Context_Items
(CU
));
3438 while Present
(Item
) loop
3439 if Nkind
(Item
) = N_With_Clause
3440 and then not Limited_Present
(Item
)
3442 -- Note: the following call to Get_Cunit_Unit_Number does a
3443 -- linear search, which could be slow, but it's OK because
3444 -- we're about to give a warning anyway. Also, there might
3445 -- be hundreds of units, but not millions. If it turns out
3446 -- to be a problem, we could store the Get_Cunit_Unit_Number
3447 -- in each N_Compilation_Unit node, but that would involve
3448 -- rearranging N_Compilation_Unit_Aux to make room.
3450 Helper
(Get_Cunit_Unit_Number
(Library_Unit
(Item
)));
3462 -- Start of processing for Within_Elaborate_All
3467 end Within_Elaborate_All
;