1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1997-2006, 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 2, 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 COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 with Atree
; use Atree
;
28 with Checks
; use Checks
;
29 with Debug
; use Debug
;
30 with Einfo
; use Einfo
;
31 with Elists
; use Elists
;
32 with Errout
; use Errout
;
33 with Exp_Tss
; use Exp_Tss
;
34 with Exp_Util
; use Exp_Util
;
35 with Expander
; use Expander
;
36 with Fname
; use Fname
;
38 with Lib
.Load
; use Lib
.Load
;
39 with Namet
; use Namet
;
40 with Nlists
; use Nlists
;
41 with Nmake
; use Nmake
;
43 with Output
; use Output
;
44 with Restrict
; use Restrict
;
45 with Rident
; use Rident
;
47 with Sem_Cat
; use Sem_Cat
;
48 with Sem_Ch7
; use Sem_Ch7
;
49 with Sem_Ch8
; use Sem_Ch8
;
50 with Sem_Res
; use Sem_Res
;
51 with Sem_Util
; use Sem_Util
;
52 with Sinfo
; use Sinfo
;
53 with Sinput
; use Sinput
;
54 with Snames
; use Snames
;
55 with Stand
; use Stand
;
57 with Tbuild
; use Tbuild
;
58 with Uname
; use Uname
;
60 package body Sem_Elab
is
62 -- The following table records the recursive call chain for output
63 -- in the Output routine. Each entry records the call node and the
64 -- entity of the called routine. The number of entries in the table
65 -- (i.e. the value of Elab_Call.Last) indicates the current depth
66 -- of recursion and is used to 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.
82 -- It holds the entities for all subprograms that have been examined
83 -- for this particular outer level call, and is used to prevent both
84 -- infinite 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. We need to compute this only
132 -- once at the outer level, i.e. for a call to Check_Elab_Call from
133 -- outside this unit.
135 Outer_Level_Sloc
: Source_Ptr
;
136 -- Save Sloc value for outer level call node for comparisons of source
137 -- locations. A body is too late if it appears after the *outer* level
138 -- call, not the particular call that is being analyzed.
140 From_Elab_Code
: Boolean;
141 -- This flag shows whether the outer level call currently being examined
142 -- is or is not in elaboration code. We are only interested in calls to
143 -- routines in other units if this flag is True.
145 In_Task_Activation
: Boolean := False;
146 -- This flag indicates whether we are performing elaboration checks on
147 -- task procedures, at the point of activation. If true, we do not trace
148 -- internal calls in these procedures, because all local bodies are known
151 Delaying_Elab_Checks
: Boolean := True;
152 -- This is set True till the compilation is complete, including the
153 -- insertion of all instance bodies. Then when Check_Elab_Calls is
154 -- called, the delay table is used to make the delayed calls and
155 -- this flag is reset to False, so that the calls are processed
157 -----------------------
158 -- Local Subprograms --
159 -----------------------
161 -- Note: Outer_Scope in all following specs represents the scope of
162 -- interest of the outer level call. If it is set to Standard_Standard,
163 -- then it means the outer level call was at elaboration level, and that
164 -- thus all calls are of interest. If it was set to some other scope,
165 -- then the original call was an inner call, and we are not interested
166 -- in calls that go outside this scope.
168 procedure Activate_Elaborate_All_Desirable
(N
: Node_Id
; U
: Entity_Id
);
169 -- Analysis of construct N shows that we should set Elaborate_All_Desirable
170 -- for the WITH clause for unit U (which will always be present). A special
171 -- case is when N is a function or procedure instantiation, in which case
172 -- it is sufficient to set Elaborate_Desirable, since in this case there is
173 -- no possibility of transitive elaboration issues.
175 procedure Check_A_Call
178 Outer_Scope
: Entity_Id
;
179 Inter_Unit_Only
: Boolean;
180 Generate_Warnings
: Boolean := True);
181 -- This is the internal recursive routine that is called to check for
182 -- a possible elaboration error. The argument N is a subprogram call
183 -- or generic instantiation to be checked, and E is the entity of
184 -- the called subprogram, or instantiated generic unit. The flag
185 -- Outer_Scope is the outer level scope for the original call.
186 -- Inter_Unit_Only is set if the call is only to be checked in the
187 -- case where it is to another unit (and skipped if within a unit).
188 -- Generate_Warnings is set to False to suppress warning messages
189 -- about missing pragma Elaborate_All's. These messages are not
190 -- wanted for inner calls in the dynamic model.
192 procedure Check_Bad_Instantiation
(N
: Node_Id
);
193 -- N is a node for an instantiation (if called with any other node kind,
194 -- Check_Bad_Instantiation ignores the call). This subprogram checks for
195 -- the special case of a generic instantiation of a generic spec in the
196 -- same declarative part as the instantiation where a body is present and
197 -- has not yet been seen. This is an obvious error, but needs to be checked
198 -- specially at the time of the instantiation, since it is a case where we
199 -- cannot insert the body anywhere. If this case is detected, warnings are
200 -- generated, and a raise of Program_Error is inserted. In addition any
201 -- subprograms in the generic spec are stubbed, and the Bad_Instantiation
202 -- flag is set on the instantiation node. The caller in Sem_Ch12 uses this
203 -- flag as an indication that no attempt should be made to insert an
206 procedure Check_Internal_Call
209 Outer_Scope
: Entity_Id
;
210 Orig_Ent
: Entity_Id
);
211 -- N is a function call or procedure statement call node and E is
212 -- the entity of the called function, which is within the current
213 -- compilation unit (where subunits count as part of the parent).
214 -- This call checks if this call, or any call within any accessed
215 -- body could cause an ABE, and if so, outputs a warning. Orig_Ent
216 -- differs from E only in the case of renamings, and points to the
217 -- original name of the entity. This is used for error messages.
218 -- Outer_Scope is the outer level scope for the original call.
220 procedure Check_Internal_Call_Continue
223 Outer_Scope
: Entity_Id
;
224 Orig_Ent
: Entity_Id
);
225 -- The processing for Check_Internal_Call is divided up into two phases,
226 -- and this represents the second phase. The second phase is delayed if
227 -- Delaying_Elab_Calls is set to True. In this delayed case, the first
228 -- phase makes an entry in the Delay_Check table, which is processed
229 -- when Check_Elab_Calls is called. N, E and Orig_Ent are as for the call
230 -- to Check_Internal_Call. Outer_Scope is the outer level scope for
231 -- the original call.
233 procedure Set_Elaboration_Constraint
237 -- The current unit U may depend semantically on some unit P which is not
238 -- in the current context. If there is an elaboration call that reaches P,
239 -- we need to indicate that P requires an Elaborate_All, but this is not
240 -- effective in U's ali file, if there is no with_clause for P. In this
241 -- case we add the Elaborate_All on the unit Q that directly or indirectly
242 -- makes P available. This can happen in two cases:
244 -- a) Q declares a subtype of a type declared in P, and the call is an
245 -- initialization call for an object of that subtype.
247 -- b) Q declares an object of some tagged type whose root type is
248 -- declared in P, and the initialization call uses object notation on
249 -- that object to reach a primitive operation or a classwide operation
252 -- If P appears in the context of U, the current processing is correct.
253 -- Otherwise we must identify these two cases to retrieve Q and place the
254 -- Elaborate_All_Desirable on it.
256 function Has_Generic_Body
(N
: Node_Id
) return Boolean;
257 -- N is a generic package instantiation node, and this routine determines
258 -- if this package spec does in fact have a generic body. If so, then
259 -- True is returned, otherwise False. Note that this is not at all the
260 -- same as checking if the unit requires a body, since it deals with
261 -- the case of optional bodies accurately (i.e. if a body is optional,
262 -- then it looks to see if a body is actually present). Note: this
263 -- function can only do a fully correct job if in generating code mode
264 -- where all bodies have to be present. If we are operating in semantics
265 -- check only mode, then in some cases of optional bodies, a result of
266 -- False may incorrectly be given. In practice this simply means that
267 -- some cases of warnings for incorrect order of elaboration will only
268 -- be given when generating code, which is not a big problem (and is
269 -- inevitable, given the optional body semantics of Ada).
271 procedure Insert_Elab_Check
(N
: Node_Id
; C
: Node_Id
:= Empty
);
272 -- Given code for an elaboration check (or unconditional raise if
273 -- the check is not needed), inserts the code in the appropriate
274 -- place. N is the call or instantiation node for which the check
275 -- code is required. C is the test whose failure triggers the raise.
277 procedure Output_Calls
(N
: Node_Id
);
278 -- Outputs chain of calls stored in the Elab_Call table. The caller
279 -- has already generated the main warning message, so the warnings
280 -- generated are all continuation messages. The argument is the
281 -- call node at which the messages are to be placed.
283 function Same_Elaboration_Scope
(Scop1
, Scop2
: Entity_Id
) return Boolean;
284 -- Given two scopes, determine whether they are the same scope from an
285 -- elaboration point of view, i.e. packages and blocks are ignored.
287 procedure Set_C_Scope
;
288 -- On entry C_Scope is set to some scope. On return, C_Scope is reset
289 -- to be the enclosing compilation unit of this scope.
291 function Spec_Entity
(E
: Entity_Id
) return Entity_Id
;
292 -- Given a compilation unit entity, if it is a spec entity, it is
293 -- returned unchanged. If it is a body entity, then the spec for
294 -- the corresponding spec is returned
296 procedure Supply_Bodies
(N
: Node_Id
);
297 -- Given a node, N, that is either a subprogram declaration or a package
298 -- declaration, this procedure supplies dummy bodies for the subprogram
299 -- or for all subprograms in the package. If the given node is not one
300 -- of these two possibilities, then Supply_Bodies does nothing. The
301 -- dummy body is supplied by setting the subprogram to be Imported with
302 -- convention Stubbed.
304 procedure Supply_Bodies
(L
: List_Id
);
305 -- Calls Supply_Bodies for all elements of the given list L
307 function Within
(E1
, E2
: Entity_Id
) return Boolean;
308 -- Given two scopes E1 and E2, returns True if E1 is equal to E2, or is one
309 -- of its contained scopes, False otherwise.
311 function Within_Elaborate_All
(E
: Entity_Id
) return Boolean;
312 -- Before emitting a warning on a scope E for a missing elaborate_all,
313 -- check whether E may be in the context of a directly visible unit U to
314 -- which the pragma applies. This prevents spurious warnings when the
315 -- called entity is renamed within U.
317 --------------------------------------
318 -- Activate_Elaborate_All_Desirable --
319 --------------------------------------
321 procedure Activate_Elaborate_All_Desirable
(N
: Node_Id
; U
: Entity_Id
) is
322 UN
: constant Unit_Number_Type
:= Get_Code_Unit
(N
);
323 CU
: constant Node_Id
:= Cunit
(UN
);
324 UE
: constant Entity_Id
:= Cunit_Entity
(UN
);
325 Unm
: constant Unit_Name_Type
:= Unit_Name
(UN
);
326 CI
: constant List_Id
:= Context_Items
(CU
);
330 procedure Add_To_Context_And_Mark
(Itm
: Node_Id
);
331 -- This procedure is called when the elaborate indication must be
332 -- applied to a unit not in the context of the referencing unit. The
333 -- unit gets added to the context as an implicit with.
335 function In_Withs_Of
(UEs
: Entity_Id
) return Boolean;
336 -- UEs is the spec entity of a unit. If the unit to be marked is
337 -- in the context item list of this unit spec, then the call returns
338 -- True and Itm is left set to point to the relevant N_With_Clause node.
340 procedure Set_Elab_Flag
(Itm
: Node_Id
);
341 -- Sets Elaborate_[All_]Desirable as appropriate on Itm
343 -----------------------------
344 -- Add_To_Context_And_Mark --
345 -----------------------------
347 procedure Add_To_Context_And_Mark
(Itm
: Node_Id
) is
348 CW
: constant Node_Id
:=
349 Make_With_Clause
(Sloc
(Itm
),
353 Set_Library_Unit
(CW
, Library_Unit
(Itm
));
354 Set_Implicit_With
(CW
, True);
356 -- Set elaborate all desirable on copy and then append the copy to
357 -- the list of body with's and we are done.
361 end Add_To_Context_And_Mark
;
367 function In_Withs_Of
(UEs
: Entity_Id
) return Boolean is
368 UNs
: constant Unit_Number_Type
:= Get_Source_Unit
(UEs
);
369 CUs
: constant Node_Id
:= Cunit
(UNs
);
370 CIs
: constant List_Id
:= Context_Items
(CUs
);
374 while Present
(Itm
) loop
375 if Nkind
(Itm
) = N_With_Clause
then
377 Cunit_Entity
(Get_Cunit_Unit_Number
(Library_Unit
(Itm
)));
394 procedure Set_Elab_Flag
(Itm
: Node_Id
) is
396 if Nkind
(N
) in N_Subprogram_Instantiation
then
397 Set_Elaborate_Desirable
(Itm
);
399 Set_Elaborate_All_Desirable
(Itm
);
403 -- Start of processing for Activate_Elaborate_All_Desirable
406 -- Do not set binder indication if expansion is disabled, as when
407 -- compiling a generic unit.
409 if not Expander_Active
then
414 while Present
(Itm
) loop
415 if Nkind
(Itm
) = N_With_Clause
then
416 Ent
:= Cunit_Entity
(Get_Cunit_Unit_Number
(Library_Unit
(Itm
)));
418 -- If we find it, then mark elaborate all desirable and return
429 -- If we fall through then the with clause is not present in the
430 -- current unit. One legitimate possibility is that the with clause
431 -- is present in the spec when we are a body.
433 if Is_Body_Name
(Unm
)
434 and then In_Withs_Of
(Spec_Entity
(UE
))
436 Add_To_Context_And_Mark
(Itm
);
440 -- Similarly, we may be in the spec or body of a child unit, where
441 -- the unit in question is with'ed by some ancestor of the child unit.
443 if Is_Child_Name
(Unm
) then
451 exit when Pkg
= Standard_Standard
;
453 if In_Withs_Of
(Pkg
) then
454 Add_To_Context_And_Mark
(Itm
);
461 -- Here if we do not find with clause on spec or body. We just ignore
462 -- this case, it means that the elaboration involves some other unit
463 -- than the unit being compiled, and will be caught elsewhere.
466 end Activate_Elaborate_All_Desirable
;
472 procedure Check_A_Call
475 Outer_Scope
: Entity_Id
;
476 Inter_Unit_Only
: Boolean;
477 Generate_Warnings
: Boolean := True)
479 Loc
: constant Source_Ptr
:= Sloc
(N
);
484 -- Top level scope of entity for called subprogram. This
485 -- value includes following renamings and derivations, so
486 -- this scope can be in a non-visible unit. This is the
487 -- scope that is to be investigated to see whether an
488 -- elaboration check is required.
491 -- Top level scope of directly called entity for subprogram. This
492 -- differs from E_Scope in the case where renamings or derivations
493 -- are involved, since it does not follow these links. W_Scope is
494 -- generally in a visible unit, and it is this scope that may require
495 -- an Elaborate_All. However, there are some cases (initialization
496 -- calls and calls involving object notation) where W_Scope might not
497 -- be in the context of the current unit, and there is an intermediate
498 -- package that is, in which case the Elaborate_All has to be placed
499 -- on this intedermediate package. These special cases are handled in
500 -- Set_Elaboration_Constraint.
502 Body_Acts_As_Spec
: Boolean;
503 -- Set to true if call is to body acting as spec (no separate spec)
505 Inst_Case
: constant Boolean := Nkind
(N
) in N_Generic_Instantiation
;
506 -- Indicates if we have instantiation case
508 Caller_Unit_Internal
: Boolean;
509 Callee_Unit_Internal
: Boolean;
511 Inst_Caller
: Source_Ptr
;
512 Inst_Callee
: Source_Ptr
;
514 Unit_Caller
: Unit_Number_Type
;
515 Unit_Callee
: Unit_Number_Type
;
517 Cunit_SC
: Boolean := False;
518 -- Set to suppress dynamic elaboration checks where one of the
519 -- enclosing scopes has Elaboration_Checks_Suppressed set, or else
520 -- if a pragma Elaborate (_All) applies to that scope, in which case
521 -- warnings on the scope are also suppressed. For the internal case,
522 -- we ignore this flag.
525 -- If the call is known to be within a local Suppress Elaboration
526 -- pragma, nothing to check. This can happen in task bodies.
528 if (Nkind
(N
) = N_Function_Call
529 or else Nkind
(N
) = N_Procedure_Call_Statement
)
530 and then No_Elaboration_Check
(N
)
535 -- Go to parent for derived subprogram, or to original subprogram
536 -- in the case of a renaming (Alias covers both these cases)
540 if (Suppress_Elaboration_Warnings
(Ent
)
541 or else Elaboration_Checks_Suppressed
(Ent
))
542 and then (Inst_Case
or else No
(Alias
(Ent
)))
547 -- Nothing to do for imported entities
549 if Is_Imported
(Ent
) then
553 exit when Inst_Case
or else No
(Alias
(Ent
));
557 Decl
:= Unit_Declaration_Node
(Ent
);
559 if Nkind
(Decl
) = N_Subprogram_Body
then
560 Body_Acts_As_Spec
:= True;
562 elsif Nkind
(Decl
) = N_Subprogram_Declaration
563 or else Nkind
(Decl
) = N_Subprogram_Body_Stub
566 Body_Acts_As_Spec
:= False;
568 -- If we have none of an instantiation, subprogram body or
569 -- subprogram declaration, then it is not a case that we want
570 -- to check. (One case is a call to a generic formal subprogram,
571 -- where we do not want the check in the template).
579 if Elaboration_Checks_Suppressed
(E_Scope
)
580 or else Suppress_Elaboration_Warnings
(E_Scope
)
585 -- Exit when we get to compilation unit, not counting subunits
587 exit when Is_Compilation_Unit
(E_Scope
)
588 and then (Is_Child_Unit
(E_Scope
)
589 or else Scope
(E_Scope
) = Standard_Standard
);
591 -- If we did not find a compilation unit, other than standard,
592 -- then nothing to check (happens in some instantiation cases)
594 if E_Scope
= Standard_Standard
then
597 -- Otherwise move up a scope looking for compilation unit
600 E_Scope
:= Scope
(E_Scope
);
604 -- No checks needed for pure or preelaborated compilation units
607 or else Is_Preelaborated
(E_Scope
)
612 -- If the generic entity is within a deeper instance than we are, then
613 -- either the instantiation to which we refer itself caused an ABE, in
614 -- which case that will be handled separately, or else we know that the
615 -- body we need appears as needed at the point of the instantiation.
616 -- However, this assumption is only valid if we are in static mode.
618 if not Dynamic_Elaboration_Checks
619 and then Instantiation_Depth
(Sloc
(Ent
)) >
620 Instantiation_Depth
(Sloc
(N
))
625 -- Do not give a warning for a package with no body
627 if Ekind
(Ent
) = E_Generic_Package
628 and then not Has_Generic_Body
(N
)
633 -- Case of entity is not in current unit (i.e. with'ed unit case)
635 if E_Scope
/= C_Scope
then
637 -- We are only interested in such calls if the outer call was from
638 -- elaboration code, or if we are in Dynamic_Elaboration_Checks mode.
640 if not From_Elab_Code
and then not Dynamic_Elaboration_Checks
then
644 -- Nothing to do if some scope said that no checks were required
650 -- Nothing to do for a generic instance, because in this case
651 -- the checking was at the point of instantiation of the generic
652 -- However, this shortcut is only applicable in static mode.
654 if Is_Generic_Instance
(Ent
) and not Dynamic_Elaboration_Checks
then
658 -- Nothing to do if subprogram with no separate spec. However,
659 -- a call to Deep_Initialize may result in a call to a user-defined
660 -- Initialize procedure, which imposes a body dependency. This
661 -- happens only if the type is controlled and the Initialize
662 -- procedure is not inherited.
664 if Body_Acts_As_Spec
then
665 if Is_TSS
(Ent
, TSS_Deep_Initialize
) then
670 Typ
:= Etype
(Next_Formal
(First_Formal
(Ent
)));
672 if not Is_Controlled
(Typ
) then
675 Init
:= Find_Prim_Op
(Typ
, Name_Initialize
);
677 if Comes_From_Source
(Init
) then
690 -- Check cases of internal units
692 Callee_Unit_Internal
:=
693 Is_Internal_File_Name
694 (Unit_File_Name
(Get_Source_Unit
(E_Scope
)));
696 -- Do not give a warning if the with'ed unit is internal
697 -- and this is the generic instantiation case (this saves a
698 -- lot of hassle dealing with the Text_IO special child units)
700 if Callee_Unit_Internal
and Inst_Case
then
704 if C_Scope
= Standard_Standard
then
705 Caller_Unit_Internal
:= False;
707 Caller_Unit_Internal
:=
708 Is_Internal_File_Name
709 (Unit_File_Name
(Get_Source_Unit
(C_Scope
)));
712 -- Do not give a warning if the with'ed unit is internal
713 -- and the caller is not internal (since the binder always
714 -- elaborates internal units first).
716 if Callee_Unit_Internal
and (not Caller_Unit_Internal
) then
720 -- For now, if debug flag -gnatdE is not set, do no checking for
721 -- one internal unit withing another. This fixes the problem with
722 -- the sgi build and storage errors. To be resolved later ???
724 if (Callee_Unit_Internal
and Caller_Unit_Internal
)
725 and then not Debug_Flag_EE
730 if Is_TSS
(E
, TSS_Deep_Initialize
) then
734 -- If the call is in an instance, and the called entity is not
735 -- defined in the same instance, then the elaboration issue
736 -- focuses around the unit containing the template, it is
737 -- this unit which requires an Elaborate_All.
739 -- However, if we are doing dynamic elaboration, we need to
740 -- chase the call in the usual manner.
742 -- We do not handle the case of calling a generic formal correctly
743 -- in the static case. See test 4703-004 to explore this gap ???
745 Inst_Caller
:= Instantiation
(Get_Source_File_Index
(Sloc
(N
)));
746 Inst_Callee
:= Instantiation
(Get_Source_File_Index
(Sloc
(Ent
)));
748 if Inst_Caller
= No_Location
then
749 Unit_Caller
:= No_Unit
;
751 Unit_Caller
:= Get_Source_Unit
(N
);
754 if Inst_Callee
= No_Location
then
755 Unit_Callee
:= No_Unit
;
757 Unit_Callee
:= Get_Source_Unit
(Ent
);
760 if Unit_Caller
/= No_Unit
761 and then Unit_Callee
/= Unit_Caller
762 and then not Dynamic_Elaboration_Checks
764 E_Scope
:= Spec_Entity
(Cunit_Entity
(Unit_Caller
));
766 -- If we don't get a spec entity, just ignore call. Not
767 -- quite clear why this check is necessary.
773 -- Otherwise step to enclosing compilation unit
775 while not Is_Compilation_Unit
(E_Scope
) loop
776 E_Scope
:= Scope
(E_Scope
);
779 -- For the case N is not an instance, or a call within instance
780 -- We recompute E_Scope for the error message, since we
781 -- do NOT want to go to the unit which has the ultimate
782 -- declaration in the case of renaming and derivation and
783 -- we also want to go to the generic unit in the case of
784 -- an instance, and no further.
787 -- Loop to carefully follow renamings and derivations
788 -- one step outside the current unit, but not further.
791 and then Present
(Alias
(Ent
))
793 E_Scope
:= Alias
(Ent
);
799 while not Is_Compilation_Unit
(E_Scope
) loop
800 E_Scope
:= Scope
(E_Scope
);
803 -- If E_Scope is the same as C_Scope, it means that there
804 -- definitely was a local renaming or derivation, and we
805 -- are not yet out of the current unit.
807 exit when E_Scope
/= C_Scope
;
811 -- If no alias, there is a previous error
819 if Within_Elaborate_All
(E_Scope
) then
823 -- Find top level scope for called entity (not following renamings
824 -- or derivations). This is where the Elaborate_All will go if it
825 -- is needed. We start with the called entity, except in the case
826 -- of an initialization procedure outside the current package, where
827 -- the init proc is in the root package, and we start from the entity
828 -- of the name in the call.
830 if Is_Entity_Name
(Name
(N
))
831 and then Is_Init_Proc
(Entity
(Name
(N
)))
832 and then not In_Same_Extended_Unit
(N
, Entity
(Name
(N
)))
834 W_Scope
:= Scope
(Entity
(Name
(N
)));
839 while not Is_Compilation_Unit
(W_Scope
) loop
840 W_Scope
:= Scope
(W_Scope
);
843 -- Now check if an elaborate_all (or dynamic check) is needed
845 if not Suppress_Elaboration_Warnings
(Ent
)
846 and then not Elaboration_Checks_Suppressed
(Ent
)
847 and then not Suppress_Elaboration_Warnings
(E_Scope
)
848 and then not Elaboration_Checks_Suppressed
(E_Scope
)
849 and then Elab_Warnings
850 and then Generate_Warnings
854 ("instantiation of& may raise Program_Error?", N
, Ent
);
857 if Is_Init_Proc
(Entity
(Name
(N
)))
858 and then Comes_From_Source
(Ent
)
861 ("implicit call to & may raise Program_Error?", N
, Ent
);
865 ("call to & may raise Program_Error?", N
, Ent
);
869 Error_Msg_Qual_Level
:= Nat
'Last;
871 if Nkind
(N
) in N_Subprogram_Instantiation
then
873 ("\missing pragma Elaborate for&?", N
, W_Scope
);
876 ("\missing pragma Elaborate_All for&?", N
, W_Scope
);
879 Error_Msg_Qual_Level
:= 0;
882 -- Set flag to prevent further warnings for same unit
883 -- unless in All_Errors_Mode.
885 if not All_Errors_Mode
and not Dynamic_Elaboration_Checks
then
886 Set_Suppress_Elaboration_Warnings
(W_Scope
, True);
890 -- Check for runtime elaboration check required
892 if Dynamic_Elaboration_Checks
then
893 if not Elaboration_Checks_Suppressed
(Ent
)
894 and then not Elaboration_Checks_Suppressed
(W_Scope
)
895 and then not Elaboration_Checks_Suppressed
(E_Scope
)
896 and then not Cunit_SC
898 -- Runtime elaboration check required. Generate check of the
899 -- elaboration Boolean for the unit containing the entity.
901 -- Note that for this case, we do check the real unit (the
902 -- one from following renamings, since that is the issue!)
904 -- Could this possibly miss a useless but required PE???
906 Insert_Elab_Check
(N
,
907 Make_Attribute_Reference
(Loc
,
908 Attribute_Name
=> Name_Elaborated
,
911 (Spec_Entity
(E_Scope
), Loc
)));
914 -- Case of static elaboration model
917 -- Do not do anything if elaboration checks suppressed. Note
918 -- that we check Ent here, not E, since we want the real entity
919 -- for the body to see if checks are suppressed for it, not the
920 -- dummy entry for renamings or derivations.
922 if Elaboration_Checks_Suppressed
(Ent
)
923 or else Elaboration_Checks_Suppressed
(E_Scope
)
924 or else Elaboration_Checks_Suppressed
(W_Scope
)
928 -- Here we need to generate an implicit elaborate all
931 -- Generate elaborate_all warning unless suppressed
933 if (Elab_Warnings
and Generate_Warnings
and not Inst_Case
)
934 and then not Suppress_Elaboration_Warnings
(Ent
)
935 and then not Suppress_Elaboration_Warnings
(E_Scope
)
936 and then not Suppress_Elaboration_Warnings
(W_Scope
)
938 Error_Msg_Node_2
:= W_Scope
;
940 ("call to& in elaboration code " &
941 "requires pragma Elaborate_All on&?", N
, E
);
944 -- Set indication for binder to generate Elaborate_All
946 Set_Elaboration_Constraint
(N
, E
, W_Scope
);
950 -- Case of entity is in same unit as call or instantiation
952 elsif not Inter_Unit_Only
then
953 Check_Internal_Call
(N
, Ent
, Outer_Scope
, E
);
957 -----------------------------
958 -- Check_Bad_Instantiation --
959 -----------------------------
961 procedure Check_Bad_Instantiation
(N
: Node_Id
) is
965 -- Nothing to do if we do not have an instantiation (happens in some
966 -- error cases, and also in the formal package declaration case)
968 if Nkind
(N
) not in N_Generic_Instantiation
then
971 -- Nothing to do if serious errors detected (avoid cascaded errors)
973 elsif Serious_Errors_Detected
/= 0 then
976 -- Nothing to do if not in full analysis mode
978 elsif not Full_Analysis
then
981 -- Nothing to do if inside a generic template
983 elsif Inside_A_Generic
then
986 -- Nothing to do if a library level instantiation
988 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
991 -- Nothing to do if we are compiling a proper body for semantic
992 -- purposes only. The generic body may be in another proper body.
995 Nkind
(Parent
(Unit_Declaration_Node
(Main_Unit_Entity
))) = N_Subunit
1000 Ent
:= Get_Generic_Entity
(N
);
1002 -- The case we are interested in is when the generic spec is in the
1003 -- current declarative part
1005 if not Same_Elaboration_Scope
(Current_Scope
, Scope
(Ent
))
1006 or else not In_Same_Extended_Unit
(N
, Ent
)
1011 -- If the generic entity is within a deeper instance than we are, then
1012 -- either the instantiation to which we refer itself caused an ABE, in
1013 -- which case that will be handled separately. Otherwise, we know that
1014 -- the body we need appears as needed at the point of the instantiation.
1015 -- If they are both at the same level but not within the same instance
1016 -- then the body of the generic will be in the earlier instance.
1019 D1
: constant Int
:= Instantiation_Depth
(Sloc
(Ent
));
1020 D2
: constant Int
:= Instantiation_Depth
(Sloc
(N
));
1027 and then Is_Generic_Instance
(Scope
(Ent
))
1028 and then not In_Open_Scopes
(Scope
(Ent
))
1034 -- Now we can proceed, if the entity being called has a completion,
1035 -- then we are definitely OK, since we have already seen the body.
1037 if Has_Completion
(Ent
) then
1041 -- If there is no body, then nothing to do
1043 if not Has_Generic_Body
(N
) then
1047 -- Here we definitely have a bad instantiation
1050 ("?cannot instantiate& before body seen", N
, Ent
);
1052 if Present
(Instance_Spec
(N
)) then
1053 Supply_Bodies
(Instance_Spec
(N
));
1057 ("\?Program_Error will be raised at run time", N
);
1058 Insert_Elab_Check
(N
);
1059 Set_ABE_Is_Certain
(N
);
1060 end Check_Bad_Instantiation
;
1062 ---------------------
1063 -- Check_Elab_Call --
1064 ---------------------
1066 procedure Check_Elab_Call
1068 Outer_Scope
: Entity_Id
:= Empty
)
1073 function Get_Called_Ent
return Entity_Id
;
1074 -- Retrieve called entity. If this is a call to a protected subprogram,
1075 -- entity is a selected component. The callable entity may be absent,
1076 -- in which case there is no check to perform. This happens with
1077 -- non-analyzed calls in nested generics.
1079 --------------------
1080 -- Get_Called_Ent --
1081 --------------------
1083 function Get_Called_Ent
return Entity_Id
is
1092 elsif Nkind
(Nam
) = N_Selected_Component
then
1093 return Entity
(Selector_Name
(Nam
));
1095 elsif not Is_Entity_Name
(Nam
) then
1099 return Entity
(Nam
);
1103 -- Start of processing for Check_Elab_Call
1106 -- If the call does not come from the main unit, there is nothing to
1107 -- check. Elaboration call from units in the context of the main unit
1108 -- will lead to semantic dependencies when those units are compiled.
1110 if not In_Extended_Main_Code_Unit
(N
) then
1114 -- For an entry call, check relevant restriction
1116 if Nkind
(N
) = N_Entry_Call_Statement
1117 and then not In_Subprogram_Or_Concurrent_Unit
1119 Check_Restriction
(No_Entry_Calls_In_Elaboration_Code
, N
);
1121 -- Nothing to do if this is not a call (happens in some error
1122 -- conditions, and in some cases where rewriting occurs).
1124 elsif Nkind
(N
) /= N_Function_Call
1125 and then Nkind
(N
) /= N_Procedure_Call_Statement
1129 -- Nothing to do if this is a call already rewritten for elab checking
1131 elsif Nkind
(Parent
(N
)) = N_Conditional_Expression
then
1134 -- Nothing to do if inside a generic template
1136 elsif Inside_A_Generic
1137 and then No
(Enclosing_Generic_Body
(N
))
1142 -- Here we have a call at elaboration time which must be checked
1144 if Debug_Flag_LL
then
1145 Write_Str
(" Check_Elab_Call: ");
1148 or else not Is_Entity_Name
(Name
(N
))
1150 Write_Str
("<<not entity name>> ");
1152 Write_Name
(Chars
(Entity
(Name
(N
))));
1155 Write_Str
(" call at ");
1156 Write_Location
(Sloc
(N
));
1160 -- Climb up the tree to make sure we are not inside default expression
1161 -- of a parameter specification or a record component, since in both
1162 -- these cases, we will be doing the actual call later, not now, and it
1163 -- is at the time of the actual call (statically speaking) that we must
1164 -- do our static check, not at the time of its initial analysis).
1166 -- However, we have to check calls within component definitions (e.g., a
1167 -- function call that determines an array component bound), so we
1168 -- terminate the loop in that case.
1171 while Present
(P
) loop
1172 if Nkind
(P
) = N_Parameter_Specification
1174 Nkind
(P
) = N_Component_Declaration
1178 -- The call occurs within the constraint of a component,
1179 -- so it must be checked.
1181 elsif Nkind
(P
) = N_Component_Definition
then
1189 -- Stuff that happens only at the outer level
1191 if No
(Outer_Scope
) then
1192 Elab_Visited
.Set_Last
(0);
1194 -- Nothing to do if current scope is Standard (this is a bit
1195 -- odd, but it happens in the case of generic instantiations).
1197 C_Scope
:= Current_Scope
;
1199 if C_Scope
= Standard_Standard
then
1203 -- First case, we are in elaboration code
1205 From_Elab_Code
:= not In_Subprogram_Or_Concurrent_Unit
;
1206 if From_Elab_Code
then
1208 -- Complain if call that comes from source in preelaborated
1209 -- unit and we are not inside a subprogram (i.e. we are in
1212 if Comes_From_Source
(N
)
1213 and then In_Preelaborated_Unit
1214 and then not In_Inlined_Body
1216 -- This is a warning in GNAT mode allowing such calls to be
1217 -- used in the predefined library with appropriate care.
1219 Error_Msg_Warn
:= GNAT_Mode
;
1221 ("<non-static call not allowed in preelaborated unit", N
);
1225 -- Second case, we are inside a subprogram or concurrent unit, which
1226 -- means we are not in elaboration code.
1229 -- In this case, the issue is whether we are inside the
1230 -- declarative part of the unit in which we live, or inside its
1231 -- statements. In the latter case, there is no issue of ABE calls
1232 -- at this level (a call from outside to the unit in which we live
1233 -- might cause an ABE, but that will be detected when we analyze
1234 -- that outer level call, as it recurses into the called unit).
1236 -- Climb up the tree, doing this test, and also testing for being
1237 -- inside a default expression, which, as discussed above, is not
1238 -- checked at this stage.
1247 -- If we find a parentless subtree, it seems safe to assume
1248 -- that we are not in a declarative part and that no
1249 -- checking is required.
1255 if Is_List_Member
(P
) then
1256 L
:= List_Containing
(P
);
1263 exit when Nkind
(P
) = N_Subunit
;
1265 -- Filter out case of default expressions, where we do not
1266 -- do the check at this stage.
1268 if Nkind
(P
) = N_Parameter_Specification
1270 Nkind
(P
) = N_Component_Declaration
1275 -- A protected body has no elaboration code and contains
1276 -- only other bodies.
1278 if Nkind
(P
) = N_Protected_Body
then
1281 elsif Nkind
(P
) = N_Subprogram_Body
1283 Nkind
(P
) = N_Task_Body
1285 Nkind
(P
) = N_Block_Statement
1287 Nkind
(P
) = N_Entry_Body
1289 if L
= Declarations
(P
) then
1292 -- We are not in elaboration code, but we are doing
1293 -- dynamic elaboration checks, in this case, we still
1294 -- need to do the call, since the subprogram we are in
1295 -- could be called from another unit, also in dynamic
1296 -- elaboration check mode, at elaboration time.
1298 elsif Dynamic_Elaboration_Checks
then
1300 -- This is a rather new check, going into version
1301 -- 3.14a1 for the first time (V1.80 of this unit), so
1302 -- we provide a debug flag to enable it. That way we
1303 -- have an easy work around for regressions that are
1304 -- caused by this new check. This debug flag can be
1307 if Debug_Flag_DD
then
1311 -- Do the check in this case
1315 elsif Nkind
(P
) = N_Task_Body
then
1317 -- The check is deferred until Check_Task_Activation
1318 -- but we need to capture local suppress pragmas
1319 -- that may inhibit checks on this call.
1321 Ent
:= Get_Called_Ent
;
1326 elsif Elaboration_Checks_Suppressed
(Current_Scope
)
1327 or else Elaboration_Checks_Suppressed
(Ent
)
1328 or else Elaboration_Checks_Suppressed
(Scope
(Ent
))
1330 Set_No_Elaboration_Check
(N
);
1335 -- Static model, call is not in elaboration code, we
1336 -- never need to worry, because in the static model the
1337 -- top level caller always takes care of things.
1348 Ent
:= Get_Called_Ent
;
1354 -- Nothing to do if this is a recursive call (i.e. a call to
1355 -- an entity that is already in the Elab_Call stack)
1357 for J
in 1 .. Elab_Visited
.Last
loop
1358 if Ent
= Elab_Visited
.Table
(J
) then
1363 -- See if we need to analyze this call. We analyze it if either of
1364 -- the following conditions is met:
1366 -- It is an inner level call (since in this case it was triggered
1367 -- by an outer level call from elaboration code), but only if the
1368 -- call is within the scope of the original outer level call.
1370 -- It is an outer level call from elaboration code, or the called
1371 -- entity is in the same elaboration scope.
1373 -- And in these cases, we will check both inter-unit calls and
1374 -- intra-unit (within a single unit) calls.
1376 C_Scope
:= Current_Scope
;
1378 -- If not outer level call, then we follow it if it is within
1379 -- the original scope of the outer call.
1381 if Present
(Outer_Scope
)
1382 and then Within
(Scope
(Ent
), Outer_Scope
)
1385 Check_A_Call
(N
, Ent
, Outer_Scope
, Inter_Unit_Only
=> False);
1387 elsif Elaboration_Checks_Suppressed
(Current_Scope
) then
1390 elsif From_Elab_Code
then
1392 Check_A_Call
(N
, Ent
, Standard_Standard
, Inter_Unit_Only
=> False);
1394 elsif Same_Elaboration_Scope
(C_Scope
, Scope
(Ent
)) then
1396 Check_A_Call
(N
, Ent
, Scope
(Ent
), Inter_Unit_Only
=> False);
1398 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode
1399 -- is set, then we will do the check, but only in the inter-unit case
1400 -- (this is to accommodate unguarded elaboration calls from other units
1401 -- in which this same mode is set). We don't want warnings in this case,
1402 -- it would generate warnings having nothing to do with elaboration.
1404 elsif Dynamic_Elaboration_Checks
then
1410 Inter_Unit_Only
=> True,
1411 Generate_Warnings
=> False);
1413 -- Otherwise nothing to do
1419 -- A call to an Init_Proc in elaboration code may bring additional
1420 -- dependencies, if some of the record components thereof have
1421 -- initializations that are function calls that come from source.
1422 -- We treat the current node as a call to each of these functions,
1423 -- to check their elaboration impact.
1425 if Is_Init_Proc
(Ent
)
1426 and then From_Elab_Code
1428 Process_Init_Proc
: declare
1429 Unit_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Ent
);
1431 function Find_Init_Call
(Nod
: Node_Id
) return Traverse_Result
;
1432 -- Find subprogram calls within body of Init_Proc for Traverse
1433 -- instantiation below.
1435 procedure Traverse_Body
is new Traverse_Proc
(Find_Init_Call
);
1436 -- Traversal procedure to find all calls with body of Init_Proc
1438 --------------------
1439 -- Find_Init_Call --
1440 --------------------
1442 function Find_Init_Call
(Nod
: Node_Id
) return Traverse_Result
is
1446 if (Nkind
(Nod
) = N_Function_Call
1447 or else Nkind
(Nod
) = N_Procedure_Call_Statement
)
1448 and then Is_Entity_Name
(Name
(Nod
))
1450 Func
:= Entity
(Name
(Nod
));
1452 if Comes_From_Source
(Func
) then
1454 (N
, Func
, Standard_Standard
, Inter_Unit_Only
=> True);
1464 -- Start of processing for Process_Init_Proc
1467 if Nkind
(Unit_Decl
) = N_Subprogram_Body
then
1468 Traverse_Body
(Handled_Statement_Sequence
(Unit_Decl
));
1470 end Process_Init_Proc
;
1472 end Check_Elab_Call
;
1474 -----------------------
1475 -- Check_Elab_Assign --
1476 -----------------------
1478 procedure Check_Elab_Assign
(N
: Node_Id
) is
1482 Pkg_Spec
: Entity_Id
;
1483 Pkg_Body
: Entity_Id
;
1486 -- For record or array component, check prefix. If it is an access
1487 -- type, then there is nothing to do (we do not know what is being
1488 -- assigned), but otherwise this is an assignment to the prefix.
1490 if Nkind
(N
) = N_Indexed_Component
1492 Nkind
(N
) = N_Selected_Component
1496 if not Is_Access_Type
(Etype
(Prefix
(N
))) then
1497 Check_Elab_Assign
(Prefix
(N
));
1503 -- For type conversion, check expression
1505 if Nkind
(N
) = N_Type_Conversion
then
1506 Check_Elab_Assign
(Expression
(N
));
1510 -- Nothing to do if this is not an entity reference otherwise get entity
1512 if Is_Entity_Name
(N
) then
1518 -- What we are looking for is a reference in the body of a package that
1519 -- modifies a variable declared in the visible part of the package spec.
1522 and then Comes_From_Source
(N
)
1523 and then not Suppress_Elaboration_Warnings
(Ent
)
1524 and then Ekind
(Ent
) = E_Variable
1525 and then not In_Private_Part
(Ent
)
1526 and then Is_Library_Level_Entity
(Ent
)
1528 Scop
:= Current_Scope
;
1530 if No
(Scop
) or else Scop
= Standard_Standard
then
1532 elsif Ekind
(Scop
) = E_Package
1533 and then Is_Compilation_Unit
(Scop
)
1537 Scop
:= Scope
(Scop
);
1541 -- Here Scop points to the containing library package
1544 Pkg_Body
:= Body_Entity
(Pkg_Spec
);
1546 -- All OK if the package has an Elaborate_Body pragma
1548 if Has_Pragma_Elaborate_Body
(Scop
) then
1552 -- OK if entity being modified is not in containing package spec
1554 if not In_Same_Source_Unit
(Scop
, Ent
) then
1558 -- All OK if entity appears in generic package or generic instance.
1559 -- We just get too messed up trying to give proper warnings in the
1560 -- presence of generics. Better no message than a junk one.
1562 Scop
:= Scope
(Ent
);
1563 while Present
(Scop
) and then Scop
/= Pkg_Spec
loop
1564 if Ekind
(Scop
) = E_Generic_Package
then
1566 elsif Ekind
(Scop
) = E_Package
1567 and then Is_Generic_Instance
(Scop
)
1572 Scop
:= Scope
(Scop
);
1575 -- All OK if in task, don't issue warnings there
1577 if In_Task_Activation
then
1581 -- OK if no package body
1583 if No
(Pkg_Body
) then
1587 -- OK if reference is not in package body
1589 if not In_Same_Source_Unit
(Pkg_Body
, N
) then
1593 -- OK if package body has no handled statement sequence
1596 HSS
: constant Node_Id
:=
1597 Handled_Statement_Sequence
(Declaration_Node
(Pkg_Body
));
1599 if No
(HSS
) or else not Comes_From_Source
(HSS
) then
1604 -- We definitely have a case of a modification of an entity in
1605 -- the package spec from the elaboration code of the package body.
1606 -- We may not give the warning (because there are some additional
1607 -- checks to avoid too many false positives), but it would be a good
1608 -- idea for the binder to try to keep the body elaboration close to
1609 -- the spec elaboration.
1611 Set_Elaborate_Body_Desirable
(Pkg_Spec
);
1613 -- All OK in gnat mode (we know what we are doing)
1619 -- All OK if warnings suppressed on the entity
1621 if Warnings_Off
(Ent
) then
1625 -- All OK if all warnings suppressed
1627 if Warning_Mode
= Suppress
then
1631 -- All OK if elaboration checks suppressed for entity
1633 if Checks_May_Be_Suppressed
(Ent
)
1634 and then Is_Check_Suppressed
(Ent
, Elaboration_Check
)
1639 -- OK if the entity is initialized. Note that the No_Initialization
1640 -- flag usually means that the initialization has been rewritten into
1641 -- assignments, but that still counts for us.
1644 Decl
: constant Node_Id
:= Declaration_Node
(Ent
);
1646 if Nkind
(Decl
) = N_Object_Declaration
1647 and then (Present
(Expression
(Decl
))
1648 or else No_Initialization
(Decl
))
1654 -- Here is where we give the warning
1656 Error_Msg_Sloc
:= Sloc
(Ent
);
1659 ("?elaboration code may access& before it is initialized",
1662 ("\?suggest adding pragma Elaborate_Body to spec of &",
1665 ("\?or an explicit initialization could be added #", N
);
1667 if not All_Errors_Mode
then
1668 Set_Suppress_Elaboration_Warnings
(Ent
);
1671 end Check_Elab_Assign
;
1673 ----------------------
1674 -- Check_Elab_Calls --
1675 ----------------------
1677 procedure Check_Elab_Calls
is
1679 -- If expansion is disabled, do not generate any checks. Also
1680 -- skip checks if any subunits are missing because in either
1681 -- case we lack the full information that we need, and no object
1682 -- file will be created in any case.
1684 if not Expander_Active
1685 or else Is_Generic_Unit
(Cunit_Entity
(Main_Unit
))
1686 or else Subunits_Missing
1691 -- Skip delayed calls if we had any errors
1693 if Serious_Errors_Detected
= 0 then
1694 Delaying_Elab_Checks
:= False;
1695 Expander_Mode_Save_And_Set
(True);
1697 for J
in Delay_Check
.First
.. Delay_Check
.Last
loop
1698 New_Scope
(Delay_Check
.Table
(J
).Curscop
);
1699 From_Elab_Code
:= Delay_Check
.Table
(J
).From_Elab_Code
;
1701 Check_Internal_Call_Continue
(
1702 N
=> Delay_Check
.Table
(J
).N
,
1703 E
=> Delay_Check
.Table
(J
).E
,
1704 Outer_Scope
=> Delay_Check
.Table
(J
).Outer_Scope
,
1705 Orig_Ent
=> Delay_Check
.Table
(J
).Orig_Ent
);
1710 -- Set Delaying_Elab_Checks back on for next main compilation
1712 Expander_Mode_Restore
;
1713 Delaying_Elab_Checks
:= True;
1715 end Check_Elab_Calls
;
1717 ------------------------------
1718 -- Check_Elab_Instantiation --
1719 ------------------------------
1721 procedure Check_Elab_Instantiation
1723 Outer_Scope
: Entity_Id
:= Empty
)
1728 -- Check for and deal with bad instantiation case. There is some
1729 -- duplicated code here, but we will worry about this later ???
1731 Check_Bad_Instantiation
(N
);
1733 if ABE_Is_Certain
(N
) then
1737 -- Nothing to do if we do not have an instantiation (happens in some
1738 -- error cases, and also in the formal package declaration case)
1740 if Nkind
(N
) not in N_Generic_Instantiation
then
1744 -- Nothing to do if inside a generic template
1746 if Inside_A_Generic
then
1750 -- Nothing to do if the instantiation is not in the main unit
1752 if not In_Extended_Main_Code_Unit
(N
) then
1756 Ent
:= Get_Generic_Entity
(N
);
1757 From_Elab_Code
:= not In_Subprogram_Or_Concurrent_Unit
;
1759 -- See if we need to analyze this instantiation. We analyze it if
1760 -- either of the following conditions is met:
1762 -- It is an inner level instantiation (since in this case it was
1763 -- triggered by an outer level call from elaboration code), but
1764 -- only if the instantiation is within the scope of the original
1765 -- outer level call.
1767 -- It is an outer level instantiation from elaboration code, or the
1768 -- instantiated entity is in the same elaboratoin scope.
1770 -- And in these cases, we will check both the inter-unit case and
1771 -- the intra-unit (within a single unit) case.
1773 C_Scope
:= Current_Scope
;
1775 if Present
(Outer_Scope
)
1776 and then Within
(Scope
(Ent
), Outer_Scope
)
1779 Check_A_Call
(N
, Ent
, Outer_Scope
, Inter_Unit_Only
=> False);
1781 elsif From_Elab_Code
then
1783 Check_A_Call
(N
, Ent
, Standard_Standard
, Inter_Unit_Only
=> False);
1785 elsif Same_Elaboration_Scope
(C_Scope
, Scope
(Ent
)) then
1787 Check_A_Call
(N
, Ent
, Scope
(Ent
), Inter_Unit_Only
=> False);
1789 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode
1790 -- is set, then we will do the check, but only in the inter-unit case
1791 -- (this is to accommodate unguarded elaboration calls from other units
1792 -- in which this same mode is set). We inhibit warnings in this case,
1793 -- since this instantiation is not occurring in elaboration code.
1795 elsif Dynamic_Elaboration_Checks
then
1801 Inter_Unit_Only
=> True,
1802 Generate_Warnings
=> False);
1807 end Check_Elab_Instantiation
;
1809 -------------------------
1810 -- Check_Internal_Call --
1811 -------------------------
1813 procedure Check_Internal_Call
1816 Outer_Scope
: Entity_Id
;
1817 Orig_Ent
: Entity_Id
)
1819 Inst_Case
: constant Boolean := Nkind
(N
) in N_Generic_Instantiation
;
1822 -- If not function or procedure call or instantiation, then ignore
1823 -- call (this happens in some error case and rewriting cases)
1825 if Nkind
(N
) /= N_Function_Call
1827 Nkind
(N
) /= N_Procedure_Call_Statement
1833 -- Nothing to do if this is a call or instantiation that has
1834 -- already been found to be a sure ABE
1836 elsif ABE_Is_Certain
(N
) then
1839 -- Nothing to do if errors already detected (avoid cascaded errors)
1841 elsif Serious_Errors_Detected
/= 0 then
1844 -- Nothing to do if not in full analysis mode
1846 elsif not Full_Analysis
then
1849 -- Nothing to do if within a default expression, since the call
1850 -- is not actualy being made at this time.
1852 elsif In_Default_Expression
then
1855 -- Nothing to do for call to intrinsic subprogram
1857 elsif Is_Intrinsic_Subprogram
(E
) then
1860 -- No need to trace local calls if checking task activation, because
1861 -- other local bodies are elaborated already.
1863 elsif In_Task_Activation
then
1867 -- Delay this call if we are still delaying calls
1869 if Delaying_Elab_Checks
then
1870 Delay_Check
.Increment_Last
;
1871 Delay_Check
.Table
(Delay_Check
.Last
) :=
1874 Orig_Ent
=> Orig_Ent
,
1875 Curscop
=> Current_Scope
,
1876 Outer_Scope
=> Outer_Scope
,
1877 From_Elab_Code
=> From_Elab_Code
);
1880 -- Otherwise, call phase 2 continuation right now
1883 Check_Internal_Call_Continue
(N
, E
, Outer_Scope
, Orig_Ent
);
1885 end Check_Internal_Call
;
1887 ----------------------------------
1888 -- Check_Internal_Call_Continue --
1889 ----------------------------------
1891 procedure Check_Internal_Call_Continue
1894 Outer_Scope
: Entity_Id
;
1895 Orig_Ent
: Entity_Id
)
1897 Loc
: constant Source_Ptr
:= Sloc
(N
);
1898 Inst_Case
: constant Boolean := Is_Generic_Unit
(E
);
1903 function Find_Elab_Reference
(N
: Node_Id
) return Traverse_Result
;
1904 -- Function applied to each node as we traverse the body. Checks for
1905 -- call or entity reference that needs checking, and if so checks it.
1906 -- Always returns OK, so entire tree is traversed, except that as
1907 -- described below subprogram bodies are skipped for now.
1909 procedure Traverse
is new Atree
.Traverse_Proc
(Find_Elab_Reference
);
1910 -- Traverse procedure using above Find_Elab_Reference function
1912 -------------------------
1913 -- Find_Elab_Reference --
1914 -------------------------
1916 function Find_Elab_Reference
(N
: Node_Id
) return Traverse_Result
is
1920 -- If user has specified that there are no entry calls in elaboration
1921 -- code, do not trace past an accept statement, because the rendez-
1922 -- vous will happen after elaboration.
1924 if (Nkind
(Original_Node
(N
)) = N_Accept_Statement
1925 or else Nkind
(Original_Node
(N
)) = N_Selective_Accept
)
1926 and then Restriction_Active
(No_Entry_Calls_In_Elaboration_Code
)
1930 -- If we have a function call, check it
1932 elsif Nkind
(N
) = N_Function_Call
then
1933 Check_Elab_Call
(N
, Outer_Scope
);
1936 -- If we have a procedure call, check the call, and also check
1937 -- arguments that are assignments (OUT or IN OUT mode formals).
1939 elsif Nkind
(N
) = N_Procedure_Call_Statement
then
1940 Check_Elab_Call
(N
, Outer_Scope
);
1942 Actual
:= First_Actual
(N
);
1943 while Present
(Actual
) loop
1944 if Known_To_Be_Assigned
(Actual
) then
1945 Check_Elab_Assign
(Actual
);
1948 Next_Actual
(Actual
);
1953 -- If we have a generic instantiation, check it
1955 elsif Nkind
(N
) in N_Generic_Instantiation
then
1956 Check_Elab_Instantiation
(N
, Outer_Scope
);
1959 -- Skip subprogram bodies that come from source (wait for
1960 -- call to analyze these). The reason for the come from
1961 -- source test is to avoid catching task bodies.
1963 -- For task bodies, we should really avoid these too, waiting
1964 -- for the task activation, but that's too much trouble to
1965 -- catch for now, so we go in unconditionally. This is not
1966 -- so terrible, it means the error backtrace is not quite
1967 -- complete, and we are too eager to scan bodies of tasks
1968 -- that are unused, but this is hardly very significant!
1970 elsif Nkind
(N
) = N_Subprogram_Body
1971 and then Comes_From_Source
(N
)
1975 elsif Nkind
(N
) = N_Assignment_Statement
1976 and then Comes_From_Source
(N
)
1978 Check_Elab_Assign
(Name
(N
));
1984 end Find_Elab_Reference
;
1986 -- Start of processing for Check_Internal_Call_Continue
1989 -- Save outer level call if at outer level
1991 if Elab_Call
.Last
= 0 then
1992 Outer_Level_Sloc
:= Loc
;
1995 Elab_Visited
.Increment_Last
;
1996 Elab_Visited
.Table
(Elab_Visited
.Last
) := E
;
1998 -- If the call is to a function that renames a literal, no check
2001 if Ekind
(E
) = E_Enumeration_Literal
then
2005 Sbody
:= Unit_Declaration_Node
(E
);
2007 if Nkind
(Sbody
) /= N_Subprogram_Body
2009 Nkind
(Sbody
) /= N_Package_Body
2011 Ebody
:= Corresponding_Body
(Sbody
);
2016 Sbody
:= Unit_Declaration_Node
(Ebody
);
2020 -- If the body appears after the outer level call or
2021 -- instantiation then we have an error case handled below.
2023 if Earlier_In_Extended_Unit
(Outer_Level_Sloc
, Sloc
(Sbody
))
2024 and then not In_Task_Activation
2028 -- If we have the instantiation case we are done, since we now
2029 -- know that the body of the generic appeared earlier.
2031 elsif Inst_Case
then
2034 -- Otherwise we have a call, so we trace through the called
2035 -- body to see if it has any problems ..
2038 pragma Assert
(Nkind
(Sbody
) = N_Subprogram_Body
);
2040 Elab_Call
.Increment_Last
;
2041 Elab_Call
.Table
(Elab_Call
.Last
).Cloc
:= Loc
;
2042 Elab_Call
.Table
(Elab_Call
.Last
).Ent
:= E
;
2044 if Debug_Flag_LL
then
2045 Write_Str
("Elab_Call.Last = ");
2046 Write_Int
(Int
(Elab_Call
.Last
));
2047 Write_Str
(" Ent = ");
2048 Write_Name
(Chars
(E
));
2050 Write_Location
(Sloc
(N
));
2054 -- Now traverse declarations and statements of subprogram body.
2055 -- Note that we cannot simply Traverse (Sbody), since traverse
2056 -- does not normally visit subprogram bodies.
2061 Decl
:= First
(Declarations
(Sbody
));
2062 while Present
(Decl
) loop
2068 Traverse
(Handled_Statement_Sequence
(Sbody
));
2070 Elab_Call
.Decrement_Last
;
2074 -- Here is the case of calling a subprogram where the body has
2075 -- not yet been encountered, a warning message is needed.
2077 -- If we have nothing in the call stack, then this is at the
2078 -- outer level, and the ABE is bound to occur.
2080 if Elab_Call
.Last
= 0 then
2083 ("?cannot instantiate& before body seen", N
, Orig_Ent
);
2086 ("?cannot call& before body seen", N
, Orig_Ent
);
2090 ("\?Program_Error will be raised at run time", N
);
2091 Insert_Elab_Check
(N
);
2093 -- Call is not at outer level
2096 -- Deal with dynamic elaboration check
2098 if not Elaboration_Checks_Suppressed
(E
) then
2099 Set_Elaboration_Entity_Required
(E
);
2101 -- Case of no elaboration entity allocated yet
2103 if No
(Elaboration_Entity
(E
)) then
2105 -- Create object declaration for elaboration entity, and put it
2106 -- just in front of the spec of the subprogram or generic unit,
2107 -- in the same scope as this unit.
2110 Loce
: constant Source_Ptr
:= Sloc
(E
);
2111 Ent
: constant Entity_Id
:=
2112 Make_Defining_Identifier
(Loc
,
2113 Chars
=> New_External_Name
(Chars
(E
), 'E'));
2116 Set_Elaboration_Entity
(E
, Ent
);
2117 New_Scope
(Scope
(E
));
2119 Insert_Action
(Declaration_Node
(E
),
2120 Make_Object_Declaration
(Loce
,
2121 Defining_Identifier
=> Ent
,
2122 Object_Definition
=>
2123 New_Occurrence_Of
(Standard_Boolean
, Loce
),
2124 Expression
=> New_Occurrence_Of
(Standard_False
, Loce
)));
2126 -- Set elaboration flag at the point of the body
2128 Set_Elaboration_Flag
(Sbody
, E
);
2130 -- Kill current value indication. This is necessary because
2131 -- the tests of this flag are inserted out of sequence and
2132 -- must not pick up bogus indications of the wrong constant
2133 -- value. Also, this is never a true constant, since one way
2134 -- or another, it gets reset.
2136 Set_Current_Value
(Ent
, Empty
);
2137 Set_Last_Assignment
(Ent
, Empty
);
2138 Set_Is_True_Constant
(Ent
, False);
2143 -- Generate check of the elaboration Boolean
2145 Insert_Elab_Check
(N
,
2146 New_Occurrence_Of
(Elaboration_Entity
(E
), Loc
));
2149 -- Generate the warning
2151 if not Suppress_Elaboration_Warnings
(E
)
2152 and then not Elaboration_Checks_Suppressed
(E
)
2156 ("instantiation of& may occur before body is seen?",
2160 ("call to& may occur before body is seen?", N
, Orig_Ent
);
2164 ("\Program_Error may be raised at run time?", N
);
2170 -- Set flag to suppress further warnings on same subprogram
2171 -- unless in all errors mode
2173 if not All_Errors_Mode
then
2174 Set_Suppress_Elaboration_Warnings
(E
);
2176 end Check_Internal_Call_Continue
;
2178 ---------------------------
2179 -- Check_Task_Activation --
2180 ---------------------------
2182 procedure Check_Task_Activation
(N
: Node_Id
) is
2183 Loc
: constant Source_Ptr
:= Sloc
(N
);
2184 Inter_Procs
: constant Elist_Id
:= New_Elmt_List
;
2185 Intra_Procs
: constant Elist_Id
:= New_Elmt_List
;
2188 Task_Scope
: Entity_Id
;
2189 Cunit_SC
: Boolean := False;
2192 Enclosing
: Entity_Id
;
2194 procedure Add_Task_Proc
(Typ
: Entity_Id
);
2195 -- Add to Task_Procs the task body procedure(s) of task types in Typ.
2196 -- For record types, this procedure recurses over component types.
2198 procedure Collect_Tasks
(Decls
: List_Id
);
2199 -- Collect the types of the tasks that are to be activated in the given
2200 -- list of declarations, in order to perform elaboration checks on the
2201 -- corresponding task procedures which are called implicitly here.
2203 function Outer_Unit
(E
: Entity_Id
) return Entity_Id
;
2204 -- find enclosing compilation unit of Entity, ignoring subunits, or
2205 -- else enclosing subprogram. If E is not a package, there is no need
2206 -- for inter-unit elaboration checks.
2212 procedure Add_Task_Proc
(Typ
: Entity_Id
) is
2214 Proc
: Entity_Id
:= Empty
;
2217 if Is_Task_Type
(Typ
) then
2218 Proc
:= Get_Task_Body_Procedure
(Typ
);
2220 elsif Is_Array_Type
(Typ
)
2221 and then Has_Task
(Base_Type
(Typ
))
2223 Add_Task_Proc
(Component_Type
(Typ
));
2225 elsif Is_Record_Type
(Typ
)
2226 and then Has_Task
(Base_Type
(Typ
))
2228 Comp
:= First_Component
(Typ
);
2229 while Present
(Comp
) loop
2230 Add_Task_Proc
(Etype
(Comp
));
2231 Comp
:= Next_Component
(Comp
);
2235 -- If the task type is another unit, we will perform the usual
2236 -- elaboration check on its enclosing unit. If the type is in the
2237 -- same unit, we can trace the task body as for an internal call,
2238 -- but we only need to examine other external calls, because at
2239 -- the point the task is activated, internal subprogram bodies
2240 -- will have been elaborated already. We keep separate lists for
2241 -- each kind of task.
2243 -- Skip this test if errors have occurred, since in this case
2244 -- we can get false indications.
2246 if Serious_Errors_Detected
/= 0 then
2250 if Present
(Proc
) then
2251 if Outer_Unit
(Scope
(Proc
)) = Enclosing
then
2253 if No
(Corresponding_Body
(Unit_Declaration_Node
(Proc
)))
2255 (not Is_Generic_Instance
(Scope
(Proc
))
2257 Scope
(Proc
) = Scope
(Defining_Identifier
(Decl
)))
2260 ("task will be activated before elaboration of its body?",
2263 ("\Program_Error will be raised at run-time?", Decl
);
2266 Present
(Corresponding_Body
(Unit_Declaration_Node
(Proc
)))
2268 Append_Elmt
(Proc
, Intra_Procs
);
2272 -- No need for multiple entries of the same type
2274 Elmt
:= First_Elmt
(Inter_Procs
);
2275 while Present
(Elmt
) loop
2276 if Node
(Elmt
) = Proc
then
2283 Append_Elmt
(Proc
, Inter_Procs
);
2292 procedure Collect_Tasks
(Decls
: List_Id
) is
2294 if Present
(Decls
) then
2295 Decl
:= First
(Decls
);
2296 while Present
(Decl
) loop
2297 if Nkind
(Decl
) = N_Object_Declaration
2298 and then Has_Task
(Etype
(Defining_Identifier
(Decl
)))
2300 Add_Task_Proc
(Etype
(Defining_Identifier
(Decl
)));
2312 function Outer_Unit
(E
: Entity_Id
) return Entity_Id
is
2317 while Present
(Outer
) loop
2318 if Elaboration_Checks_Suppressed
(Outer
) then
2322 exit when Is_Child_Unit
(Outer
)
2323 or else Scope
(Outer
) = Standard_Standard
2324 or else Ekind
(Outer
) /= E_Package
;
2325 Outer
:= Scope
(Outer
);
2331 -- Start of processing for Check_Task_Activation
2334 Enclosing
:= Outer_Unit
(Current_Scope
);
2336 -- Find all tasks declared in the current unit
2338 if Nkind
(N
) = N_Package_Body
then
2339 P
:= Unit_Declaration_Node
(Corresponding_Spec
(N
));
2341 Collect_Tasks
(Declarations
(N
));
2342 Collect_Tasks
(Visible_Declarations
(Specification
(P
)));
2343 Collect_Tasks
(Private_Declarations
(Specification
(P
)));
2345 elsif Nkind
(N
) = N_Package_Declaration
then
2346 Collect_Tasks
(Visible_Declarations
(Specification
(N
)));
2347 Collect_Tasks
(Private_Declarations
(Specification
(N
)));
2350 Collect_Tasks
(Declarations
(N
));
2353 -- We only perform detailed checks in all tasks are library level
2354 -- entities. If the master is a subprogram or task, activation will
2355 -- depend on the activation of the master itself.
2357 -- Should dynamic checks be added in the more general case???
2359 if Ekind
(Enclosing
) /= E_Package
then
2363 -- For task types defined in other units, we want the unit containing
2364 -- the task body to be elaborated before the current one.
2366 Elmt
:= First_Elmt
(Inter_Procs
);
2367 while Present
(Elmt
) loop
2369 Task_Scope
:= Outer_Unit
(Scope
(Ent
));
2371 if not Is_Compilation_Unit
(Task_Scope
) then
2374 elsif Suppress_Elaboration_Warnings
(Task_Scope
)
2375 or else Elaboration_Checks_Suppressed
(Task_Scope
)
2379 elsif Dynamic_Elaboration_Checks
then
2380 if not Elaboration_Checks_Suppressed
(Ent
)
2381 and then not Cunit_SC
2383 not Restriction_Active
(No_Entry_Calls_In_Elaboration_Code
)
2385 -- Runtime elaboration check required. generate check of the
2386 -- elaboration Boolean for the unit containing the entity.
2388 Insert_Elab_Check
(N
,
2389 Make_Attribute_Reference
(Loc
,
2390 Attribute_Name
=> Name_Elaborated
,
2393 (Spec_Entity
(Task_Scope
), Loc
)));
2397 -- Force the binder to elaborate other unit first
2399 if not Suppress_Elaboration_Warnings
(Ent
)
2400 and then not Elaboration_Checks_Suppressed
(Ent
)
2401 and then Elab_Warnings
2402 and then not Suppress_Elaboration_Warnings
(Task_Scope
)
2403 and then not Elaboration_Checks_Suppressed
(Task_Scope
)
2405 Error_Msg_Node_2
:= Task_Scope
;
2406 Error_Msg_NE
("activation of an instance of task type&" &
2407 " requires pragma Elaborate_All on &?", N
, Ent
);
2410 Activate_Elaborate_All_Desirable
(N
, Task_Scope
);
2411 Set_Suppress_Elaboration_Warnings
(Task_Scope
);
2417 -- For tasks declared in the current unit, trace other calls within
2418 -- the task procedure bodies, which are available.
2420 In_Task_Activation
:= True;
2422 Elmt
:= First_Elmt
(Intra_Procs
);
2423 while Present
(Elmt
) loop
2425 Check_Internal_Call_Continue
(N
, Ent
, Enclosing
, Ent
);
2429 In_Task_Activation
:= False;
2430 end Check_Task_Activation
;
2432 --------------------------------
2433 -- Set_Elaboration_Constraint --
2434 --------------------------------
2436 procedure Set_Elaboration_Constraint
2441 Elab_Unit
: Entity_Id
;
2442 Init_Call
: constant Boolean :=
2443 Chars
(Subp
) = Name_Initialize
2444 and then Comes_From_Source
(Subp
)
2445 and then Present
(Parameter_Associations
(Call
))
2446 and then Is_Controlled
2447 (Etype
(First
(Parameter_Associations
(Call
))));
2449 -- If the unit is mentioned in a with_clause of the current
2450 -- unit, it is visible, and we can set the elaboration flag.
2452 if Is_Immediately_Visible
(Scop
)
2454 (Is_Child_Unit
(Scop
) and then Is_Visible_Child_Unit
(Scop
))
2456 Activate_Elaborate_All_Desirable
(Call
, Scop
);
2457 Set_Suppress_Elaboration_Warnings
(Scop
, True);
2461 -- If this is not an initialization call or a call using object notation
2462 -- we know that the unit of the called entity is in the context, and
2463 -- we can set the flag as well. The unit need not be visible if the call
2464 -- occurs within an instantiation.
2466 if Is_Init_Proc
(Subp
)
2468 or else Nkind
(Original_Node
(Call
)) = N_Selected_Component
2470 null; -- detailed processing follows.
2473 Activate_Elaborate_All_Desirable
(Call
, Scop
);
2474 Set_Suppress_Elaboration_Warnings
(Scop
, True);
2478 -- If the unit is not in the context, there must be an intermediate
2479 -- unit that is, on which we need to place to elaboration flag. This
2480 -- happens with init proc calls.
2482 if Is_Init_Proc
(Subp
)
2485 -- The initialization call is on an object whose type is not
2486 -- declared in the same scope as the subprogram. The type of
2487 -- the object must be a subtype of the type of operation. This
2488 -- object is the first actual in the call.
2491 Typ
: constant Entity_Id
:=
2492 Etype
(First
(Parameter_Associations
(Call
)));
2494 Elab_Unit
:= Scope
(Typ
);
2495 while (Present
(Elab_Unit
))
2496 and then not Is_Compilation_Unit
(Elab_Unit
)
2498 Elab_Unit
:= Scope
(Elab_Unit
);
2502 -- If original node uses selected component notation, the prefix is
2503 -- visible and determines the scope that must be elaborated. After
2504 -- rewriting, the prefix is the first actual in the call.
2506 elsif Nkind
(Original_Node
(Call
)) = N_Selected_Component
then
2507 Elab_Unit
:= Scope
(Etype
(First
(Parameter_Associations
(Call
))));
2509 -- Not one of special cases above
2512 -- Using previously computed scope. If the elaboration check is
2513 -- done after analysis, the scope is not visible any longer, but
2514 -- must still be in the context.
2519 Activate_Elaborate_All_Desirable
(Call
, Elab_Unit
);
2520 Set_Suppress_Elaboration_Warnings
(Elab_Unit
, True);
2521 end Set_Elaboration_Constraint
;
2523 ----------------------
2524 -- Has_Generic_Body --
2525 ----------------------
2527 function Has_Generic_Body
(N
: Node_Id
) return Boolean is
2528 Ent
: constant Entity_Id
:= Get_Generic_Entity
(N
);
2529 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Ent
);
2532 function Find_Body_In
(E
: Entity_Id
; N
: Node_Id
) return Node_Id
;
2533 -- Determine if the list of nodes headed by N and linked by Next
2534 -- contains a package body for the package spec entity E, and if
2535 -- so return the package body. If not, then returns Empty.
2537 function Load_Package_Body
(Nam
: Unit_Name_Type
) return Node_Id
;
2538 -- This procedure is called load the unit whose name is given by Nam.
2539 -- This unit is being loaded to see whether it contains an optional
2540 -- generic body. The returned value is the loaded unit, which is
2541 -- always a package body (only package bodies can contain other
2542 -- entities in the sense in which Has_Generic_Body is interested).
2543 -- We only attempt to load bodies if we are generating code. If we
2544 -- are in semantics check only mode, then it would be wrong to load
2545 -- bodies that are not required from a semantic point of view, so
2546 -- in this case we return Empty. The result is that the caller may
2547 -- incorrectly decide that a generic spec does not have a body when
2548 -- in fact it does, but the only harm in this is that some warnings
2549 -- on elaboration problems may be lost in semantic checks only mode,
2550 -- which is not big loss. We also return Empty if we go for a body
2551 -- and it is not there.
2553 function Locate_Corresponding_Body
(PE
: Entity_Id
) return Node_Id
;
2554 -- PE is the entity for a package spec. This function locates the
2555 -- corresponding package body, returning Empty if none is found.
2556 -- The package body returned is fully parsed but may not yet be
2557 -- analyzed, so only syntactic fields should be referenced.
2563 function Find_Body_In
(E
: Entity_Id
; N
: Node_Id
) return Node_Id
is
2568 while Present
(Nod
) loop
2570 -- If we found the package body we are looking for, return it
2572 if Nkind
(Nod
) = N_Package_Body
2573 and then Chars
(Defining_Unit_Name
(Nod
)) = Chars
(E
)
2577 -- If we found the stub for the body, go after the subunit,
2578 -- loading it if necessary.
2580 elsif Nkind
(Nod
) = N_Package_Body_Stub
2581 and then Chars
(Defining_Identifier
(Nod
)) = Chars
(E
)
2583 if Present
(Library_Unit
(Nod
)) then
2584 return Unit
(Library_Unit
(Nod
));
2587 return Load_Package_Body
(Get_Unit_Name
(Nod
));
2590 -- If neither package body nor stub, keep looking on chain
2600 -----------------------
2601 -- Load_Package_Body --
2602 -----------------------
2604 function Load_Package_Body
(Nam
: Unit_Name_Type
) return Node_Id
is
2605 U
: Unit_Number_Type
;
2608 if Operating_Mode
/= Generate_Code
then
2621 return Unit
(Cunit
(U
));
2624 end Load_Package_Body
;
2626 -------------------------------
2627 -- Locate_Corresponding_Body --
2628 -------------------------------
2630 function Locate_Corresponding_Body
(PE
: Entity_Id
) return Node_Id
is
2631 Spec
: constant Node_Id
:= Declaration_Node
(PE
);
2632 Decl
: constant Node_Id
:= Parent
(Spec
);
2633 Scop
: constant Entity_Id
:= Scope
(PE
);
2637 if Is_Library_Level_Entity
(PE
) then
2639 -- If package is a library unit that requires a body, we have
2640 -- no choice but to go after that body because it might contain
2641 -- an optional body for the original generic package.
2643 if Unit_Requires_Body
(PE
) then
2645 -- Load the body. Note that we are a little careful here to
2646 -- use Spec to get the unit number, rather than PE or Decl,
2647 -- since in the case where the package is itself a library
2648 -- level instantiation, Spec will properly reference the
2649 -- generic template, which is what we really want.
2653 (Get_Body_Name
(Unit_Name
(Get_Source_Unit
(Spec
))));
2655 -- But if the package is a library unit that does NOT require
2656 -- a body, then no body is permitted, so we are sure that there
2657 -- is no body for the original generic package.
2663 -- Otherwise look and see if we are embedded in a further package
2665 elsif Is_Package_Or_Generic_Package
(Scop
) then
2667 -- If so, get the body of the enclosing package, and look in
2668 -- its package body for the package body we are looking for.
2670 PBody
:= Locate_Corresponding_Body
(Scop
);
2675 return Find_Body_In
(PE
, First
(Declarations
(PBody
)));
2678 -- If we are not embedded in a further package, then the body
2679 -- must be in the same declarative part as we are.
2682 return Find_Body_In
(PE
, Next
(Decl
));
2684 end Locate_Corresponding_Body
;
2686 -- Start of processing for Has_Generic_Body
2689 if Present
(Corresponding_Body
(Decl
)) then
2692 elsif Unit_Requires_Body
(Ent
) then
2695 -- Compilation units cannot have optional bodies
2697 elsif Is_Compilation_Unit
(Ent
) then
2700 -- Otherwise look at what scope we are in
2703 Scop
:= Scope
(Ent
);
2705 -- Case of entity is in other than a package spec, in this case
2706 -- the body, if present, must be in the same declarative part.
2708 if not Is_Package_Or_Generic_Package
(Scop
) then
2713 -- Declaration node may get us a spec, so if so, go to
2714 -- the parent declaration.
2716 P
:= Declaration_Node
(Ent
);
2717 while not Is_List_Member
(P
) loop
2721 return Present
(Find_Body_In
(Ent
, Next
(P
)));
2724 -- If the entity is in a package spec, then we have to locate
2725 -- the corresponding package body, and look there.
2729 PBody
: constant Node_Id
:= Locate_Corresponding_Body
(Scop
);
2737 (Find_Body_In
(Ent
, (First
(Declarations
(PBody
)))));
2742 end Has_Generic_Body
;
2744 -----------------------
2745 -- Insert_Elab_Check --
2746 -----------------------
2748 procedure Insert_Elab_Check
(N
: Node_Id
; C
: Node_Id
:= Empty
) is
2750 Loc
: constant Source_Ptr
:= Sloc
(N
);
2753 -- If expansion is disabled, do not generate any checks. Also
2754 -- skip checks if any subunits are missing because in either
2755 -- case we lack the full information that we need, and no object
2756 -- file will be created in any case.
2758 if not Expander_Active
or else Subunits_Missing
then
2762 -- If we have a generic instantiation, where Instance_Spec is set,
2763 -- then this field points to a generic instance spec that has
2764 -- been inserted before the instantiation node itself, so that
2765 -- is where we want to insert a check.
2767 if Nkind
(N
) in N_Generic_Instantiation
2768 and then Present
(Instance_Spec
(N
))
2770 Nod
:= Instance_Spec
(N
);
2775 -- If we are inserting at the top level, insert in Aux_Decls
2777 if Nkind
(Parent
(Nod
)) = N_Compilation_Unit
then
2779 ADN
: constant Node_Id
:= Aux_Decls_Node
(Parent
(Nod
));
2785 Make_Raise_Program_Error
(Loc
,
2786 Reason
=> PE_Access_Before_Elaboration
);
2789 Make_Raise_Program_Error
(Loc
,
2790 Condition
=> Make_Op_Not
(Loc
, C
),
2791 Reason
=> PE_Access_Before_Elaboration
);
2794 if No
(Declarations
(ADN
)) then
2795 Set_Declarations
(ADN
, New_List
(R
));
2797 Append_To
(Declarations
(ADN
), R
);
2803 -- Otherwise just insert before the node in question. However, if
2804 -- the context of the call has already been analyzed, an insertion
2805 -- will not work if it depends on subsequent expansion (e.g. a call in
2806 -- a branch of a short-circuit). In that case we replace the call with
2807 -- a conditional expression, or with a Raise if it is unconditional.
2808 -- Unfortunately this does not work if the call has a dynamic size,
2809 -- because gigi regards it as a dynamic-sized temporary. If such a call
2810 -- appears in a short-circuit expression, the elaboration check will be
2811 -- missed (rare enough ???). Otherwise, the code below inserts the check
2812 -- at the appropriate place before the call. Same applies in the even
2813 -- rarer case the return type has a known size but is unconstrained.
2816 if Nkind
(N
) = N_Function_Call
2817 and then Analyzed
(Parent
(N
))
2818 and then Size_Known_At_Compile_Time
(Etype
(N
))
2820 (not Has_Discriminants
(Etype
(N
))
2821 or else Is_Constrained
(Etype
(N
)))
2825 Typ
: constant Entity_Id
:= Etype
(N
);
2826 Chk
: constant Boolean := Do_Range_Check
(N
);
2828 R
: constant Node_Id
:=
2829 Make_Raise_Program_Error
(Loc
,
2830 Reason
=> PE_Access_Before_Elaboration
);
2840 Make_Conditional_Expression
(Loc
,
2841 Expressions
=> New_List
(C
, Relocate_Node
(N
), R
)));
2844 Analyze_And_Resolve
(N
, Typ
);
2846 -- If the original call requires a range check, so does the
2847 -- conditional expression.
2850 Enable_Range_Check
(N
);
2852 Set_Do_Range_Check
(N
, False);
2859 Make_Raise_Program_Error
(Loc
,
2860 Reason
=> PE_Access_Before_Elaboration
));
2863 Make_Raise_Program_Error
(Loc
,
2867 Reason
=> PE_Access_Before_Elaboration
));
2871 end Insert_Elab_Check
;
2877 procedure Output_Calls
(N
: Node_Id
) is
2880 function Is_Printable_Error_Name
(Nm
: Name_Id
) return Boolean;
2881 -- An internal function, used to determine if a name, Nm, is either
2882 -- a non-internal name, or is an internal name that is printable
2883 -- by the error message circuits (i.e. it has a single upper
2884 -- case letter at the end).
2886 function Is_Printable_Error_Name
(Nm
: Name_Id
) return Boolean is
2888 if not Is_Internal_Name
(Nm
) then
2891 elsif Name_Len
= 1 then
2895 Name_Len
:= Name_Len
- 1;
2896 return not Is_Internal_Name
;
2898 end Is_Printable_Error_Name
;
2900 -- Start of processing for Output_Calls
2903 for J
in reverse 1 .. Elab_Call
.Last
loop
2904 Error_Msg_Sloc
:= Elab_Call
.Table
(J
).Cloc
;
2906 Ent
:= Elab_Call
.Table
(J
).Ent
;
2908 if Is_Generic_Unit
(Ent
) then
2909 Error_Msg_NE
("\?& instantiated #", N
, Ent
);
2911 elsif Is_Init_Proc
(Ent
) then
2912 Error_Msg_N
("\?initialization procedure called #", N
);
2914 elsif Is_Printable_Error_Name
(Chars
(Ent
)) then
2915 Error_Msg_NE
("\?& called #", N
, Ent
);
2918 Error_Msg_N
("\? called #", N
);
2923 ----------------------------
2924 -- Same_Elaboration_Scope --
2925 ----------------------------
2927 function Same_Elaboration_Scope
(Scop1
, Scop2
: Entity_Id
) return Boolean is
2932 -- Find elaboration scope for Scop1
2933 -- This is either a subprogram or a compilation unit.
2936 while S1
/= Standard_Standard
2937 and then not Is_Compilation_Unit
(S1
)
2938 and then (Ekind
(S1
) = E_Package
2940 Ekind
(S1
) = E_Protected_Type
2942 Ekind
(S1
) = E_Block
)
2947 -- Find elaboration scope for Scop2
2950 while S2
/= Standard_Standard
2951 and then not Is_Compilation_Unit
(S2
)
2952 and then (Ekind
(S2
) = E_Package
2954 Ekind
(S2
) = E_Protected_Type
2956 Ekind
(S2
) = E_Block
)
2962 end Same_Elaboration_Scope
;
2968 procedure Set_C_Scope
is
2970 while not Is_Compilation_Unit
(C_Scope
) loop
2971 C_Scope
:= Scope
(C_Scope
);
2979 function Spec_Entity
(E
: Entity_Id
) return Entity_Id
is
2983 -- Check for case of body entity
2984 -- Why is the check for E_Void needed???
2986 if Ekind
(E
) = E_Void
2987 or else Ekind
(E
) = E_Subprogram_Body
2988 or else Ekind
(E
) = E_Package_Body
2993 Decl
:= Parent
(Decl
);
2994 exit when Nkind
(Decl
) in N_Proper_Body
;
2997 return Corresponding_Spec
(Decl
);
3008 procedure Supply_Bodies
(N
: Node_Id
) is
3010 if Nkind
(N
) = N_Subprogram_Declaration
then
3012 Ent
: constant Entity_Id
:= Defining_Unit_Name
(Specification
(N
));
3014 Set_Is_Imported
(Ent
);
3015 Set_Convention
(Ent
, Convention_Stubbed
);
3018 elsif Nkind
(N
) = N_Package_Declaration
then
3020 Spec
: constant Node_Id
:= Specification
(N
);
3022 New_Scope
(Defining_Unit_Name
(Spec
));
3023 Supply_Bodies
(Visible_Declarations
(Spec
));
3024 Supply_Bodies
(Private_Declarations
(Spec
));
3030 procedure Supply_Bodies
(L
: List_Id
) is
3035 while Present
(Elmt
) loop
3036 Supply_Bodies
(Elmt
);
3046 function Within
(E1
, E2
: Entity_Id
) return Boolean is
3055 elsif Scop
= Standard_Standard
then
3059 Scop
:= Scope
(Scop
);
3063 raise Program_Error
;
3066 --------------------------
3067 -- Within_Elaborate_All --
3068 --------------------------
3070 function Within_Elaborate_All
(E
: Entity_Id
) return Boolean is
3073 Elab_Id
: Entity_Id
;
3077 Item
:= First
(Context_Items
(Cunit
(Current_Sem_Unit
)));
3078 while Present
(Item
) loop
3079 if Nkind
(Item
) = N_Pragma
3080 and then Get_Pragma_Id
(Chars
(Item
)) = Pragma_Elaborate_All
3082 -- Return if some previous error on the pragma itself
3084 if Error_Posted
(Item
) then
3090 (Expression
(First
(Pragma_Argument_Associations
(Item
))));
3092 Par
:= Parent
(Unit_Declaration_Node
(Elab_Id
));
3094 Item2
:= First
(Context_Items
(Par
));
3095 while Present
(Item2
) loop
3096 if Nkind
(Item2
) = N_With_Clause
3097 and then Entity
(Name
(Item2
)) = E
3110 end Within_Elaborate_All
;