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
407 while Present
(Itm
) loop
408 if Nkind
(Itm
) = N_With_Clause
then
409 Ent
:= Cunit_Entity
(Get_Cunit_Unit_Number
(Library_Unit
(Itm
)));
411 -- If we find it, then mark elaborate all desirable and return
422 -- If we fall through then the with clause is not present in the
423 -- current unit. One legitimate possibility is that the with clause
424 -- is present in the spec when we are a body.
426 if Is_Body_Name
(Unm
)
427 and then In_Withs_Of
(Spec_Entity
(UE
))
429 Add_To_Context_And_Mark
(Itm
);
433 -- Similarly, we may be in the spec or body of a child unit, where
434 -- the unit in question is with'ed by some ancestor of the child unit.
436 if Is_Child_Name
(Unm
) then
444 exit when Pkg
= Standard_Standard
;
446 if In_Withs_Of
(Pkg
) then
447 Add_To_Context_And_Mark
(Itm
);
454 -- Here if we do not find with clause on spec or body. We just ignore
455 -- this case, it means that the elaboration involves some other unit
456 -- than the unit being compiled, and will be caught elsewhere.
459 end Activate_Elaborate_All_Desirable
;
465 procedure Check_A_Call
468 Outer_Scope
: Entity_Id
;
469 Inter_Unit_Only
: Boolean;
470 Generate_Warnings
: Boolean := True)
472 Loc
: constant Source_Ptr
:= Sloc
(N
);
477 -- Top level scope of entity for called subprogram. This
478 -- value includes following renamings and derivations, so
479 -- this scope can be in a non-visible unit. This is the
480 -- scope that is to be investigated to see whether an
481 -- elaboration check is required.
484 -- Top level scope of directly called entity for subprogram. This
485 -- differs from E_Scope in the case where renamings or derivations
486 -- are involved, since it does not follow these links. W_Scope is
487 -- generally in a visible unit, and it is this scope that may require
488 -- an Elaborate_All. However, there are some cases (initialization
489 -- calls and calls involving object notation) where W_Scope might not
490 -- be in the context of the current unit, and there is an intermediate
491 -- package that is, in which case the Elaborate_All has to be placed
492 -- on this intedermediate package. These special cases are handled in
493 -- Set_Elaboration_Constraint.
495 Body_Acts_As_Spec
: Boolean;
496 -- Set to true if call is to body acting as spec (no separate spec)
498 Inst_Case
: constant Boolean := Nkind
(N
) in N_Generic_Instantiation
;
499 -- Indicates if we have instantiation case
501 Caller_Unit_Internal
: Boolean;
502 Callee_Unit_Internal
: Boolean;
504 Inst_Caller
: Source_Ptr
;
505 Inst_Callee
: Source_Ptr
;
507 Unit_Caller
: Unit_Number_Type
;
508 Unit_Callee
: Unit_Number_Type
;
510 Cunit_SC
: Boolean := False;
511 -- Set to suppress dynamic elaboration checks where one of the
512 -- enclosing scopes has Elaboration_Checks_Suppressed set, or else
513 -- if a pragma Elaborate (_All) applies to that scope, in which case
514 -- warnings on the scope are also suppressed. For the internal case,
515 -- we ignore this flag.
518 -- If the call is known to be within a local Suppress Elaboration
519 -- pragma, nothing to check. This can happen in task bodies.
521 if (Nkind
(N
) = N_Function_Call
522 or else Nkind
(N
) = N_Procedure_Call_Statement
)
523 and then No_Elaboration_Check
(N
)
528 -- Go to parent for derived subprogram, or to original subprogram
529 -- in the case of a renaming (Alias covers both these cases)
533 if (Suppress_Elaboration_Warnings
(Ent
)
534 or else Elaboration_Checks_Suppressed
(Ent
))
535 and then (Inst_Case
or else No
(Alias
(Ent
)))
540 -- Nothing to do for imported entities
542 if Is_Imported
(Ent
) then
546 exit when Inst_Case
or else No
(Alias
(Ent
));
550 Decl
:= Unit_Declaration_Node
(Ent
);
552 if Nkind
(Decl
) = N_Subprogram_Body
then
553 Body_Acts_As_Spec
:= True;
555 elsif Nkind
(Decl
) = N_Subprogram_Declaration
556 or else Nkind
(Decl
) = N_Subprogram_Body_Stub
559 Body_Acts_As_Spec
:= False;
561 -- If we have none of an instantiation, subprogram body or
562 -- subprogram declaration, then it is not a case that we want
563 -- to check. (One case is a call to a generic formal subprogram,
564 -- where we do not want the check in the template).
572 if Elaboration_Checks_Suppressed
(E_Scope
)
573 or else Suppress_Elaboration_Warnings
(E_Scope
)
578 -- Exit when we get to compilation unit, not counting subunits
580 exit when Is_Compilation_Unit
(E_Scope
)
581 and then (Is_Child_Unit
(E_Scope
)
582 or else Scope
(E_Scope
) = Standard_Standard
);
584 -- If we did not find a compilation unit, other than standard,
585 -- then nothing to check (happens in some instantiation cases)
587 if E_Scope
= Standard_Standard
then
590 -- Otherwise move up a scope looking for compilation unit
593 E_Scope
:= Scope
(E_Scope
);
597 -- No checks needed for pure or preelaborated compilation units
600 or else Is_Preelaborated
(E_Scope
)
605 -- If the generic entity is within a deeper instance than we are, then
606 -- either the instantiation to which we refer itself caused an ABE, in
607 -- which case that will be handled separately, or else we know that the
608 -- body we need appears as needed at the point of the instantiation.
609 -- However, this assumption is only valid if we are in static mode.
611 if not Dynamic_Elaboration_Checks
612 and then Instantiation_Depth
(Sloc
(Ent
)) >
613 Instantiation_Depth
(Sloc
(N
))
618 -- Do not give a warning for a package with no body
620 if Ekind
(Ent
) = E_Generic_Package
621 and then not Has_Generic_Body
(N
)
626 -- Case of entity is not in current unit (i.e. with'ed unit case)
628 if E_Scope
/= C_Scope
then
630 -- We are only interested in such calls if the outer call was from
631 -- elaboration code, or if we are in Dynamic_Elaboration_Checks mode.
633 if not From_Elab_Code
and then not Dynamic_Elaboration_Checks
then
637 -- Nothing to do if some scope said that no checks were required
643 -- Nothing to do for a generic instance, because in this case
644 -- the checking was at the point of instantiation of the generic
645 -- However, this shortcut is only applicable in static mode.
647 if Is_Generic_Instance
(Ent
) and not Dynamic_Elaboration_Checks
then
651 -- Nothing to do if subprogram with no separate spec. However,
652 -- a call to Deep_Initialize may result in a call to a user-defined
653 -- Initialize procedure, which imposes a body dependency. This
654 -- happens only if the type is controlled and the Initialize
655 -- procedure is not inherited.
657 if Body_Acts_As_Spec
then
658 if Is_TSS
(Ent
, TSS_Deep_Initialize
) then
663 Typ
:= Etype
(Next_Formal
(First_Formal
(Ent
)));
665 if not Is_Controlled
(Typ
) then
668 Init
:= Find_Prim_Op
(Typ
, Name_Initialize
);
670 if Comes_From_Source
(Init
) then
683 -- Check cases of internal units
685 Callee_Unit_Internal
:=
686 Is_Internal_File_Name
687 (Unit_File_Name
(Get_Source_Unit
(E_Scope
)));
689 -- Do not give a warning if the with'ed unit is internal
690 -- and this is the generic instantiation case (this saves a
691 -- lot of hassle dealing with the Text_IO special child units)
693 if Callee_Unit_Internal
and Inst_Case
then
697 if C_Scope
= Standard_Standard
then
698 Caller_Unit_Internal
:= False;
700 Caller_Unit_Internal
:=
701 Is_Internal_File_Name
702 (Unit_File_Name
(Get_Source_Unit
(C_Scope
)));
705 -- Do not give a warning if the with'ed unit is internal
706 -- and the caller is not internal (since the binder always
707 -- elaborates internal units first).
709 if Callee_Unit_Internal
and (not Caller_Unit_Internal
) then
713 -- For now, if debug flag -gnatdE is not set, do no checking for
714 -- one internal unit withing another. This fixes the problem with
715 -- the sgi build and storage errors. To be resolved later ???
717 if (Callee_Unit_Internal
and Caller_Unit_Internal
)
718 and then not Debug_Flag_EE
723 if Is_TSS
(E
, TSS_Deep_Initialize
) then
727 -- If the call is in an instance, and the called entity is not
728 -- defined in the same instance, then the elaboration issue
729 -- focuses around the unit containing the template, it is
730 -- this unit which requires an Elaborate_All.
732 -- However, if we are doing dynamic elaboration, we need to
733 -- chase the call in the usual manner.
735 -- We do not handle the case of calling a generic formal correctly
736 -- in the static case. See test 4703-004 to explore this gap ???
738 Inst_Caller
:= Instantiation
(Get_Source_File_Index
(Sloc
(N
)));
739 Inst_Callee
:= Instantiation
(Get_Source_File_Index
(Sloc
(Ent
)));
741 if Inst_Caller
= No_Location
then
742 Unit_Caller
:= No_Unit
;
744 Unit_Caller
:= Get_Source_Unit
(N
);
747 if Inst_Callee
= No_Location
then
748 Unit_Callee
:= No_Unit
;
750 Unit_Callee
:= Get_Source_Unit
(Ent
);
753 if Unit_Caller
/= No_Unit
754 and then Unit_Callee
/= Unit_Caller
755 and then not Dynamic_Elaboration_Checks
757 E_Scope
:= Spec_Entity
(Cunit_Entity
(Unit_Caller
));
759 -- If we don't get a spec entity, just ignore call. Not
760 -- quite clear why this check is necessary.
766 -- Otherwise step to enclosing compilation unit
768 while not Is_Compilation_Unit
(E_Scope
) loop
769 E_Scope
:= Scope
(E_Scope
);
772 -- For the case N is not an instance, or a call within instance
773 -- We recompute E_Scope for the error message, since we
774 -- do NOT want to go to the unit which has the ultimate
775 -- declaration in the case of renaming and derivation and
776 -- we also want to go to the generic unit in the case of
777 -- an instance, and no further.
780 -- Loop to carefully follow renamings and derivations
781 -- one step outside the current unit, but not further.
784 and then Present
(Alias
(Ent
))
786 E_Scope
:= Alias
(Ent
);
792 while not Is_Compilation_Unit
(E_Scope
) loop
793 E_Scope
:= Scope
(E_Scope
);
796 -- If E_Scope is the same as C_Scope, it means that there
797 -- definitely was a local renaming or derivation, and we
798 -- are not yet out of the current unit.
800 exit when E_Scope
/= C_Scope
;
804 -- If no alias, there is a previous error
812 if Within_Elaborate_All
(E_Scope
) then
816 -- Find top level scope for called entity (not following renamings
817 -- or derivations). This is where the Elaborate_All will go if it
818 -- is needed. We start with the called entity, except in the case
819 -- of an initialization procedure outside the current package, where
820 -- the init proc is in the root package, and we start from the entity
821 -- of the name in the call.
823 if Is_Entity_Name
(Name
(N
))
824 and then Is_Init_Proc
(Entity
(Name
(N
)))
825 and then not In_Same_Extended_Unit
(N
, Entity
(Name
(N
)))
827 W_Scope
:= Scope
(Entity
(Name
(N
)));
832 while not Is_Compilation_Unit
(W_Scope
) loop
833 W_Scope
:= Scope
(W_Scope
);
836 -- Now check if an elaborate_all (or dynamic check) is needed
838 if not Suppress_Elaboration_Warnings
(Ent
)
839 and then not Elaboration_Checks_Suppressed
(Ent
)
840 and then not Suppress_Elaboration_Warnings
(E_Scope
)
841 and then not Elaboration_Checks_Suppressed
(E_Scope
)
842 and then Elab_Warnings
843 and then Generate_Warnings
847 ("instantiation of& may raise Program_Error?", N
, Ent
);
850 if Is_Init_Proc
(Entity
(Name
(N
)))
851 and then Comes_From_Source
(Ent
)
854 ("implicit call to & may raise Program_Error?", N
, Ent
);
858 ("call to & may raise Program_Error?", N
, Ent
);
862 Error_Msg_Qual_Level
:= Nat
'Last;
864 if Nkind
(N
) in N_Subprogram_Instantiation
then
866 ("\missing pragma Elaborate for&?", N
, W_Scope
);
869 ("\missing pragma Elaborate_All for&?", N
, W_Scope
);
872 Error_Msg_Qual_Level
:= 0;
875 -- Set flag to prevent further warnings for same unit
876 -- unless in All_Errors_Mode.
878 if not All_Errors_Mode
and not Dynamic_Elaboration_Checks
then
879 Set_Suppress_Elaboration_Warnings
(W_Scope
, True);
883 -- Check for runtime elaboration check required
885 if Dynamic_Elaboration_Checks
then
886 if not Elaboration_Checks_Suppressed
(Ent
)
887 and then not Elaboration_Checks_Suppressed
(W_Scope
)
888 and then not Elaboration_Checks_Suppressed
(E_Scope
)
889 and then not Cunit_SC
891 -- Runtime elaboration check required. Generate check of the
892 -- elaboration Boolean for the unit containing the entity.
894 -- Note that for this case, we do check the real unit (the
895 -- one from following renamings, since that is the issue!)
897 -- Could this possibly miss a useless but required PE???
899 Insert_Elab_Check
(N
,
900 Make_Attribute_Reference
(Loc
,
901 Attribute_Name
=> Name_Elaborated
,
904 (Spec_Entity
(E_Scope
), Loc
)));
907 -- Case of static elaboration model
910 -- Do not do anything if elaboration checks suppressed. Note
911 -- that we check Ent here, not E, since we want the real entity
912 -- for the body to see if checks are suppressed for it, not the
913 -- dummy entry for renamings or derivations.
915 if Elaboration_Checks_Suppressed
(Ent
)
916 or else Elaboration_Checks_Suppressed
(E_Scope
)
917 or else Elaboration_Checks_Suppressed
(W_Scope
)
921 -- Here we need to generate an implicit elaborate all
924 -- Generate elaborate_all warning unless suppressed
926 if (Elab_Warnings
and Generate_Warnings
and not Inst_Case
)
927 and then not Suppress_Elaboration_Warnings
(Ent
)
928 and then not Suppress_Elaboration_Warnings
(E_Scope
)
929 and then not Suppress_Elaboration_Warnings
(W_Scope
)
931 Error_Msg_Node_2
:= W_Scope
;
933 ("call to& in elaboration code " &
934 "requires pragma Elaborate_All on&?", N
, E
);
937 -- Set indication for binder to generate Elaborate_All
939 Set_Elaboration_Constraint
(N
, E
, W_Scope
);
943 -- Case of entity is in same unit as call or instantiation
945 elsif not Inter_Unit_Only
then
946 Check_Internal_Call
(N
, Ent
, Outer_Scope
, E
);
950 -----------------------------
951 -- Check_Bad_Instantiation --
952 -----------------------------
954 procedure Check_Bad_Instantiation
(N
: Node_Id
) is
958 -- Nothing to do if we do not have an instantiation (happens in some
959 -- error cases, and also in the formal package declaration case)
961 if Nkind
(N
) not in N_Generic_Instantiation
then
964 -- Nothing to do if serious errors detected (avoid cascaded errors)
966 elsif Serious_Errors_Detected
/= 0 then
969 -- Nothing to do if not in full analysis mode
971 elsif not Full_Analysis
then
974 -- Nothing to do if inside a generic template
976 elsif Inside_A_Generic
then
979 -- Nothing to do if a library level instantiation
981 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
984 -- Nothing to do if we are compiling a proper body for semantic
985 -- purposes only. The generic body may be in another proper body.
988 Nkind
(Parent
(Unit_Declaration_Node
(Main_Unit_Entity
))) = N_Subunit
993 Ent
:= Get_Generic_Entity
(N
);
995 -- The case we are interested in is when the generic spec is in the
996 -- current declarative part
998 if not Same_Elaboration_Scope
(Current_Scope
, Scope
(Ent
))
999 or else not In_Same_Extended_Unit
(N
, Ent
)
1004 -- If the generic entity is within a deeper instance than we are, then
1005 -- either the instantiation to which we refer itself caused an ABE, in
1006 -- which case that will be handled separately. Otherwise, we know that
1007 -- the body we need appears as needed at the point of the instantiation.
1008 -- If they are both at the same level but not within the same instance
1009 -- then the body of the generic will be in the earlier instance.
1012 D1
: constant Int
:= Instantiation_Depth
(Sloc
(Ent
));
1013 D2
: constant Int
:= Instantiation_Depth
(Sloc
(N
));
1020 and then Is_Generic_Instance
(Scope
(Ent
))
1021 and then not In_Open_Scopes
(Scope
(Ent
))
1027 -- Now we can proceed, if the entity being called has a completion,
1028 -- then we are definitely OK, since we have already seen the body.
1030 if Has_Completion
(Ent
) then
1034 -- If there is no body, then nothing to do
1036 if not Has_Generic_Body
(N
) then
1040 -- Here we definitely have a bad instantiation
1043 ("?cannot instantiate& before body seen", N
, Ent
);
1045 if Present
(Instance_Spec
(N
)) then
1046 Supply_Bodies
(Instance_Spec
(N
));
1050 ("\?Program_Error will be raised at run time", N
);
1051 Insert_Elab_Check
(N
);
1052 Set_ABE_Is_Certain
(N
);
1053 end Check_Bad_Instantiation
;
1055 ---------------------
1056 -- Check_Elab_Call --
1057 ---------------------
1059 procedure Check_Elab_Call
1061 Outer_Scope
: Entity_Id
:= Empty
)
1066 function Get_Called_Ent
return Entity_Id
;
1067 -- Retrieve called entity. If this is a call to a protected subprogram,
1068 -- entity is a selected component. The callable entity may be absent,
1069 -- in which case there is no check to perform. This happens with
1070 -- non-analyzed calls in nested generics.
1072 --------------------
1073 -- Get_Called_Ent --
1074 --------------------
1076 function Get_Called_Ent
return Entity_Id
is
1085 elsif Nkind
(Nam
) = N_Selected_Component
then
1086 return Entity
(Selector_Name
(Nam
));
1088 elsif not Is_Entity_Name
(Nam
) then
1092 return Entity
(Nam
);
1096 -- Start of processing for Check_Elab_Call
1099 -- If the call does not come from the main unit, there is nothing to
1100 -- check. Elaboration call from units in the context of the main unit
1101 -- will lead to semantic dependencies when those units are compiled.
1103 if not In_Extended_Main_Code_Unit
(N
) then
1107 -- For an entry call, check relevant restriction
1109 if Nkind
(N
) = N_Entry_Call_Statement
1110 and then not In_Subprogram_Or_Concurrent_Unit
1112 Check_Restriction
(No_Entry_Calls_In_Elaboration_Code
, N
);
1114 -- Nothing to do if this is not a call (happens in some error
1115 -- conditions, and in some cases where rewriting occurs).
1117 elsif Nkind
(N
) /= N_Function_Call
1118 and then Nkind
(N
) /= N_Procedure_Call_Statement
1122 -- Nothing to do if this is a call already rewritten for elab checking
1124 elsif Nkind
(Parent
(N
)) = N_Conditional_Expression
then
1127 -- Nothing to do if inside a generic template
1129 elsif Inside_A_Generic
1130 and then No
(Enclosing_Generic_Body
(N
))
1135 -- Here we have a call at elaboration time which must be checked
1137 if Debug_Flag_LL
then
1138 Write_Str
(" Check_Elab_Call: ");
1141 or else not Is_Entity_Name
(Name
(N
))
1143 Write_Str
("<<not entity name>> ");
1145 Write_Name
(Chars
(Entity
(Name
(N
))));
1148 Write_Str
(" call at ");
1149 Write_Location
(Sloc
(N
));
1153 -- Climb up the tree to make sure we are not inside a
1154 -- default expression of a parameter specification or
1155 -- a record component, since in both these cases, we
1156 -- will be doing the actual call later, not now, and it
1157 -- is at the time of the actual call (statically speaking)
1158 -- that we must do our static check, not at the time of
1159 -- its initial analysis). However, we have to check calls
1160 -- within component definitions (e.g., a function call
1161 -- that determines an array component bound), so we
1162 -- terminate the loop in that case.
1165 while Present
(P
) loop
1166 if Nkind
(P
) = N_Parameter_Specification
1168 Nkind
(P
) = N_Component_Declaration
1172 -- The call occurs within the constraint of a component,
1173 -- so it must be checked.
1175 elsif Nkind
(P
) = N_Component_Definition
then
1183 -- Stuff that happens only at the outer level
1185 if No
(Outer_Scope
) then
1186 Elab_Visited
.Set_Last
(0);
1188 -- Nothing to do if current scope is Standard (this is a bit
1189 -- odd, but it happens in the case of generic instantiations).
1191 C_Scope
:= Current_Scope
;
1193 if C_Scope
= Standard_Standard
then
1197 -- First case, we are in elaboration code
1199 From_Elab_Code
:= not In_Subprogram_Or_Concurrent_Unit
;
1200 if From_Elab_Code
then
1202 -- Complain if call that comes from source in preelaborated
1203 -- unit and we are not inside a subprogram (i.e. we are in
1206 if Comes_From_Source
(N
)
1207 and then In_Preelaborated_Unit
1208 and then not In_Inlined_Body
1210 -- This is a warning in GNAT mode allowing such calls to be
1211 -- used in the predefined library with appropriate care.
1213 Error_Msg_Warn
:= GNAT_Mode
;
1215 ("<non-static call not allowed in preelaborated unit", N
);
1219 -- Second case, we are inside a subprogram or concurrent unit, which
1220 -- means we are not in elaboration code.
1223 -- In this case, the issue is whether we are inside the
1224 -- declarative part of the unit in which we live, or inside its
1225 -- statements. In the latter case, there is no issue of ABE calls
1226 -- at this level (a call from outside to the unit in which we live
1227 -- might cause an ABE, but that will be detected when we analyze
1228 -- that outer level call, as it recurses into the called unit).
1230 -- Climb up the tree, doing this test, and also testing for being
1231 -- inside a default expression, which, as discussed above, is not
1232 -- checked at this stage.
1241 -- If we find a parentless subtree, it seems safe to assume
1242 -- that we are not in a declarative part and that no
1243 -- checking is required.
1249 if Is_List_Member
(P
) then
1250 L
:= List_Containing
(P
);
1257 exit when Nkind
(P
) = N_Subunit
;
1259 -- Filter out case of default expressions, where we do not
1260 -- do the check at this stage.
1262 if Nkind
(P
) = N_Parameter_Specification
1264 Nkind
(P
) = N_Component_Declaration
1269 -- A protected body has no elaboration code and contains
1270 -- only other bodies.
1272 if Nkind
(P
) = N_Protected_Body
then
1275 elsif Nkind
(P
) = N_Subprogram_Body
1277 Nkind
(P
) = N_Task_Body
1279 Nkind
(P
) = N_Block_Statement
1281 Nkind
(P
) = N_Entry_Body
1283 if L
= Declarations
(P
) then
1286 -- We are not in elaboration code, but we are doing
1287 -- dynamic elaboration checks, in this case, we still
1288 -- need to do the call, since the subprogram we are in
1289 -- could be called from another unit, also in dynamic
1290 -- elaboration check mode, at elaboration time.
1292 elsif Dynamic_Elaboration_Checks
then
1294 -- This is a rather new check, going into version
1295 -- 3.14a1 for the first time (V1.80 of this unit), so
1296 -- we provide a debug flag to enable it. That way we
1297 -- have an easy work around for regressions that are
1298 -- caused by this new check. This debug flag can be
1301 if Debug_Flag_DD
then
1305 -- Do the check in this case
1309 elsif Nkind
(P
) = N_Task_Body
then
1311 -- The check is deferred until Check_Task_Activation
1312 -- but we need to capture local suppress pragmas
1313 -- that may inhibit checks on this call.
1315 Ent
:= Get_Called_Ent
;
1320 elsif Elaboration_Checks_Suppressed
(Current_Scope
)
1321 or else Elaboration_Checks_Suppressed
(Ent
)
1322 or else Elaboration_Checks_Suppressed
(Scope
(Ent
))
1324 Set_No_Elaboration_Check
(N
);
1329 -- Static model, call is not in elaboration code, we
1330 -- never need to worry, because in the static model
1331 -- the top level caller always takes care of things.
1342 Ent
:= Get_Called_Ent
;
1348 -- Nothing to do if this is a recursive call (i.e. a call to
1349 -- an entity that is already in the Elab_Call stack)
1351 for J
in 1 .. Elab_Visited
.Last
loop
1352 if Ent
= Elab_Visited
.Table
(J
) then
1357 -- See if we need to analyze this call. We analyze it if either of
1358 -- the following conditions is met:
1360 -- It is an inner level call (since in this case it was triggered
1361 -- by an outer level call from elaboration code), but only if the
1362 -- call is within the scope of the original outer level call.
1364 -- It is an outer level call from elaboration code, or the called
1365 -- entity is in the same elaboration scope.
1367 -- And in these cases, we will check both inter-unit calls and
1368 -- intra-unit (within a single unit) calls.
1370 C_Scope
:= Current_Scope
;
1372 -- If not outer level call, then we follow it if it is within
1373 -- the original scope of the outer call.
1375 if Present
(Outer_Scope
)
1376 and then Within
(Scope
(Ent
), Outer_Scope
)
1379 Check_A_Call
(N
, Ent
, Outer_Scope
, Inter_Unit_Only
=> False);
1381 elsif Elaboration_Checks_Suppressed
(Current_Scope
) then
1384 elsif From_Elab_Code
then
1386 Check_A_Call
(N
, Ent
, Standard_Standard
, Inter_Unit_Only
=> False);
1388 elsif Same_Elaboration_Scope
(C_Scope
, Scope
(Ent
)) then
1390 Check_A_Call
(N
, Ent
, Scope
(Ent
), Inter_Unit_Only
=> False);
1392 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode
1393 -- is set, then we will do the check, but only in the inter-unit case
1394 -- (this is to accommodate unguarded elaboration calls from other units
1395 -- in which this same mode is set). We don't want warnings in this case,
1396 -- it would generate warnings having nothing to do with elaboration.
1398 elsif Dynamic_Elaboration_Checks
then
1404 Inter_Unit_Only
=> True,
1405 Generate_Warnings
=> False);
1407 -- Otherwise nothing to do
1413 -- A call to an Init_Proc in elaboration code may bring additional
1414 -- dependencies, if some of the record components thereof have
1415 -- initializations that are function calls that come from source.
1416 -- We treat the current node as a call to each of these functions,
1417 -- to check their elaboration impact.
1419 if Is_Init_Proc
(Ent
)
1420 and then From_Elab_Code
1422 Process_Init_Proc
: declare
1423 Unit_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Ent
);
1425 function Process
(Nod
: Node_Id
) return Traverse_Result
;
1426 -- Find subprogram calls within body of init_proc for
1427 -- Traverse instantiation below.
1429 function Process
(Nod
: Node_Id
) return Traverse_Result
is
1433 if (Nkind
(Nod
) = N_Function_Call
1434 or else Nkind
(Nod
) = N_Procedure_Call_Statement
)
1435 and then Is_Entity_Name
(Name
(Nod
))
1437 Func
:= Entity
(Name
(Nod
));
1439 if Comes_From_Source
(Func
) then
1441 (N
, Func
, Standard_Standard
, Inter_Unit_Only
=> True);
1451 procedure Traverse_Body
is new Traverse_Proc
(Process
);
1453 -- Start of processing for Process_Init_Proc
1456 if Nkind
(Unit_Decl
) = N_Subprogram_Body
then
1457 Traverse_Body
(Handled_Statement_Sequence
(Unit_Decl
));
1459 end Process_Init_Proc
;
1461 end Check_Elab_Call
;
1463 ----------------------
1464 -- Check_Elab_Calls --
1465 ----------------------
1467 procedure Check_Elab_Calls
is
1469 -- If expansion is disabled, do not generate any checks. Also
1470 -- skip checks if any subunits are missing because in either
1471 -- case we lack the full information that we need, and no object
1472 -- file will be created in any case.
1474 if not Expander_Active
1475 or else Is_Generic_Unit
(Cunit_Entity
(Main_Unit
))
1476 or else Subunits_Missing
1481 -- Skip delayed calls if we had any errors
1483 if Serious_Errors_Detected
= 0 then
1484 Delaying_Elab_Checks
:= False;
1485 Expander_Mode_Save_And_Set
(True);
1487 for J
in Delay_Check
.First
.. Delay_Check
.Last
loop
1488 New_Scope
(Delay_Check
.Table
(J
).Curscop
);
1489 From_Elab_Code
:= Delay_Check
.Table
(J
).From_Elab_Code
;
1491 Check_Internal_Call_Continue
(
1492 N
=> Delay_Check
.Table
(J
).N
,
1493 E
=> Delay_Check
.Table
(J
).E
,
1494 Outer_Scope
=> Delay_Check
.Table
(J
).Outer_Scope
,
1495 Orig_Ent
=> Delay_Check
.Table
(J
).Orig_Ent
);
1500 -- Set Delaying_Elab_Checks back on for next main compilation
1502 Expander_Mode_Restore
;
1503 Delaying_Elab_Checks
:= True;
1505 end Check_Elab_Calls
;
1507 ------------------------------
1508 -- Check_Elab_Instantiation --
1509 ------------------------------
1511 procedure Check_Elab_Instantiation
1513 Outer_Scope
: Entity_Id
:= Empty
)
1518 -- Check for and deal with bad instantiation case. There is some
1519 -- duplicated code here, but we will worry about this later ???
1521 Check_Bad_Instantiation
(N
);
1523 if ABE_Is_Certain
(N
) then
1527 -- Nothing to do if we do not have an instantiation (happens in some
1528 -- error cases, and also in the formal package declaration case)
1530 if Nkind
(N
) not in N_Generic_Instantiation
then
1534 -- Nothing to do if inside a generic template
1536 if Inside_A_Generic
then
1540 -- Nothing to do if the instantiation is not in the main unit
1542 if not In_Extended_Main_Code_Unit
(N
) then
1546 Ent
:= Get_Generic_Entity
(N
);
1547 From_Elab_Code
:= not In_Subprogram_Or_Concurrent_Unit
;
1549 -- See if we need to analyze this instantiation. We analyze it if
1550 -- either of the following conditions is met:
1552 -- It is an inner level instantiation (since in this case it was
1553 -- triggered by an outer level call from elaboration code), but
1554 -- only if the instantiation is within the scope of the original
1555 -- outer level call.
1557 -- It is an outer level instantiation from elaboration code, or the
1558 -- instantiated entity is in the same elaboratoin scope.
1560 -- And in these cases, we will check both the inter-unit case and
1561 -- the intra-unit (within a single unit) case.
1563 C_Scope
:= Current_Scope
;
1565 if Present
(Outer_Scope
)
1566 and then Within
(Scope
(Ent
), Outer_Scope
)
1569 Check_A_Call
(N
, Ent
, Outer_Scope
, Inter_Unit_Only
=> False);
1571 elsif From_Elab_Code
then
1573 Check_A_Call
(N
, Ent
, Standard_Standard
, Inter_Unit_Only
=> False);
1575 elsif Same_Elaboration_Scope
(C_Scope
, Scope
(Ent
)) then
1577 Check_A_Call
(N
, Ent
, Scope
(Ent
), Inter_Unit_Only
=> False);
1579 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode
1580 -- is set, then we will do the check, but only in the inter-unit case
1581 -- (this is to accommodate unguarded elaboration calls from other units
1582 -- in which this same mode is set). We inhibit warnings in this case,
1583 -- since this instantiation is not occurring in elaboration code.
1585 elsif Dynamic_Elaboration_Checks
then
1591 Inter_Unit_Only
=> True,
1592 Generate_Warnings
=> False);
1597 end Check_Elab_Instantiation
;
1599 -------------------------
1600 -- Check_Internal_Call --
1601 -------------------------
1603 procedure Check_Internal_Call
1606 Outer_Scope
: Entity_Id
;
1607 Orig_Ent
: Entity_Id
)
1609 Inst_Case
: constant Boolean := Nkind
(N
) in N_Generic_Instantiation
;
1612 -- If not function or procedure call or instantiation, then ignore
1613 -- call (this happens in some error case and rewriting cases)
1615 if Nkind
(N
) /= N_Function_Call
1617 Nkind
(N
) /= N_Procedure_Call_Statement
1623 -- Nothing to do if this is a call or instantiation that has
1624 -- already been found to be a sure ABE
1626 elsif ABE_Is_Certain
(N
) then
1629 -- Nothing to do if errors already detected (avoid cascaded errors)
1631 elsif Serious_Errors_Detected
/= 0 then
1634 -- Nothing to do if not in full analysis mode
1636 elsif not Full_Analysis
then
1639 -- Nothing to do if within a default expression, since the call
1640 -- is not actualy being made at this time.
1642 elsif In_Default_Expression
then
1645 -- Nothing to do for call to intrinsic subprogram
1647 elsif Is_Intrinsic_Subprogram
(E
) then
1650 -- No need to trace local calls if checking task activation, because
1651 -- other local bodies are elaborated already.
1653 elsif In_Task_Activation
then
1657 -- Delay this call if we are still delaying calls
1659 if Delaying_Elab_Checks
then
1660 Delay_Check
.Increment_Last
;
1661 Delay_Check
.Table
(Delay_Check
.Last
) :=
1664 Orig_Ent
=> Orig_Ent
,
1665 Curscop
=> Current_Scope
,
1666 Outer_Scope
=> Outer_Scope
,
1667 From_Elab_Code
=> From_Elab_Code
);
1670 -- Otherwise, call phase 2 continuation right now
1673 Check_Internal_Call_Continue
(N
, E
, Outer_Scope
, Orig_Ent
);
1675 end Check_Internal_Call
;
1677 ----------------------------------
1678 -- Check_Internal_Call_Continue --
1679 ----------------------------------
1681 procedure Check_Internal_Call_Continue
1684 Outer_Scope
: Entity_Id
;
1685 Orig_Ent
: Entity_Id
)
1687 Loc
: constant Source_Ptr
:= Sloc
(N
);
1688 Inst_Case
: constant Boolean := Is_Generic_Unit
(E
);
1693 function Process
(N
: Node_Id
) return Traverse_Result
;
1694 -- Function applied to each node as we traverse the body.
1695 -- Checks for call that needs checking, and if so checks
1696 -- it. Always returns OK, so entire tree is traversed.
1702 function Process
(N
: Node_Id
) return Traverse_Result
is
1704 -- If user has specified that there are no entry calls in elaboration
1705 -- code, do not trace past an accept statement, because the rendez-
1706 -- vous will happen after elaboration.
1708 if (Nkind
(Original_Node
(N
)) = N_Accept_Statement
1709 or else Nkind
(Original_Node
(N
)) = N_Selective_Accept
)
1710 and then Restriction_Active
(No_Entry_Calls_In_Elaboration_Code
)
1714 -- If we have a subprogram call, check it
1716 elsif Nkind
(N
) = N_Function_Call
1717 or else Nkind
(N
) = N_Procedure_Call_Statement
1719 Check_Elab_Call
(N
, Outer_Scope
);
1722 -- If we have a generic instantiation, check it
1724 elsif Nkind
(N
) in N_Generic_Instantiation
then
1725 Check_Elab_Instantiation
(N
, Outer_Scope
);
1728 -- Skip subprogram bodies that come from source (wait for
1729 -- call to analyze these). The reason for the come from
1730 -- source test is to avoid catching task bodies.
1732 -- For task bodies, we should really avoid these too, waiting
1733 -- for the task activation, but that's too much trouble to
1734 -- catch for now, so we go in unconditionally. This is not
1735 -- so terrible, it means the error backtrace is not quite
1736 -- complete, and we are too eager to scan bodies of tasks
1737 -- that are unused, but this is hardly very significant!
1739 elsif Nkind
(N
) = N_Subprogram_Body
1740 and then Comes_From_Source
(N
)
1749 procedure Traverse
is new Atree
.Traverse_Proc
;
1750 -- Traverse procedure using above Process function
1752 -- Start of processing for Check_Internal_Call_Continue
1755 -- Save outer level call if at outer level
1757 if Elab_Call
.Last
= 0 then
1758 Outer_Level_Sloc
:= Loc
;
1761 Elab_Visited
.Increment_Last
;
1762 Elab_Visited
.Table
(Elab_Visited
.Last
) := E
;
1764 -- If the call is to a function that renames a literal, no check
1767 if Ekind
(E
) = E_Enumeration_Literal
then
1771 Sbody
:= Unit_Declaration_Node
(E
);
1773 if Nkind
(Sbody
) /= N_Subprogram_Body
1775 Nkind
(Sbody
) /= N_Package_Body
1777 Ebody
:= Corresponding_Body
(Sbody
);
1782 Sbody
:= Unit_Declaration_Node
(Ebody
);
1786 -- If the body appears after the outer level call or
1787 -- instantiation then we have an error case handled below.
1789 if Earlier_In_Extended_Unit
(Outer_Level_Sloc
, Sloc
(Sbody
))
1790 and then not In_Task_Activation
1794 -- If we have the instantiation case we are done, since we now
1795 -- know that the body of the generic appeared earlier.
1797 elsif Inst_Case
then
1800 -- Otherwise we have a call, so we trace through the called
1801 -- body to see if it has any problems ..
1804 pragma Assert
(Nkind
(Sbody
) = N_Subprogram_Body
);
1806 Elab_Call
.Increment_Last
;
1807 Elab_Call
.Table
(Elab_Call
.Last
).Cloc
:= Loc
;
1808 Elab_Call
.Table
(Elab_Call
.Last
).Ent
:= E
;
1810 if Debug_Flag_LL
then
1811 Write_Str
("Elab_Call.Last = ");
1812 Write_Int
(Int
(Elab_Call
.Last
));
1813 Write_Str
(" Ent = ");
1814 Write_Name
(Chars
(E
));
1816 Write_Location
(Sloc
(N
));
1820 -- Now traverse declarations and statements of subprogram body.
1821 -- Note that we cannot simply Traverse (Sbody), since traverse
1822 -- does not normally visit subprogram bodies.
1827 Decl
:= First
(Declarations
(Sbody
));
1828 while Present
(Decl
) loop
1834 Traverse
(Handled_Statement_Sequence
(Sbody
));
1836 Elab_Call
.Decrement_Last
;
1840 -- Here is the case of calling a subprogram where the body has
1841 -- not yet been encountered, a warning message is needed.
1843 -- If we have nothing in the call stack, then this is at the
1844 -- outer level, and the ABE is bound to occur.
1846 if Elab_Call
.Last
= 0 then
1849 ("?cannot instantiate& before body seen", N
, Orig_Ent
);
1852 ("?cannot call& before body seen", N
, Orig_Ent
);
1856 ("\?Program_Error will be raised at run time", N
);
1857 Insert_Elab_Check
(N
);
1859 -- Call is not at outer level
1862 -- Deal with dynamic elaboration check
1864 if not Elaboration_Checks_Suppressed
(E
) then
1865 Set_Elaboration_Entity_Required
(E
);
1867 -- Case of no elaboration entity allocated yet
1869 if No
(Elaboration_Entity
(E
)) then
1871 -- Create object declaration for elaboration entity, and put it
1872 -- just in front of the spec of the subprogram or generic unit,
1873 -- in the same scope as this unit.
1876 Loce
: constant Source_Ptr
:= Sloc
(E
);
1877 Ent
: constant Entity_Id
:=
1878 Make_Defining_Identifier
(Loc
,
1879 Chars
=> New_External_Name
(Chars
(E
), 'E'));
1882 Set_Elaboration_Entity
(E
, Ent
);
1883 New_Scope
(Scope
(E
));
1885 Insert_Action
(Declaration_Node
(E
),
1886 Make_Object_Declaration
(Loce
,
1887 Defining_Identifier
=> Ent
,
1888 Object_Definition
=>
1889 New_Occurrence_Of
(Standard_Boolean
, Loce
),
1890 Expression
=> New_Occurrence_Of
(Standard_False
, Loce
)));
1892 -- Set elaboration flag at the point of the body
1894 Set_Elaboration_Flag
(Sbody
, E
);
1896 -- Kill current value indication. This is necessary
1897 -- because the tests of this flag are inserted out of
1898 -- sequence and must not pick up bogus indications of
1899 -- the wrong constant value. Also, this is never a true
1900 -- constant, since one way or another, it gets reset.
1902 Set_Current_Value
(Ent
, Empty
);
1903 Set_Is_True_Constant
(Ent
, False);
1908 -- Generate check of the elaboration Boolean
1910 Insert_Elab_Check
(N
,
1911 New_Occurrence_Of
(Elaboration_Entity
(E
), Loc
));
1914 -- Generate the warning
1916 if not Suppress_Elaboration_Warnings
(E
)
1917 and then not Elaboration_Checks_Suppressed
(E
)
1921 ("instantiation of& may occur before body is seen?",
1925 ("call to& may occur before body is seen?", N
, Orig_Ent
);
1929 ("\Program_Error may be raised at run time?", N
);
1935 -- Set flag to suppress further warnings on same subprogram
1936 -- unless in all errors mode
1938 if not All_Errors_Mode
then
1939 Set_Suppress_Elaboration_Warnings
(E
);
1941 end Check_Internal_Call_Continue
;
1943 ---------------------------
1944 -- Check_Task_Activation --
1945 ---------------------------
1947 procedure Check_Task_Activation
(N
: Node_Id
) is
1948 Loc
: constant Source_Ptr
:= Sloc
(N
);
1949 Inter_Procs
: constant Elist_Id
:= New_Elmt_List
;
1950 Intra_Procs
: constant Elist_Id
:= New_Elmt_List
;
1953 Task_Scope
: Entity_Id
;
1954 Cunit_SC
: Boolean := False;
1957 Enclosing
: Entity_Id
;
1959 procedure Add_Task_Proc
(Typ
: Entity_Id
);
1960 -- Add to Task_Procs the task body procedure(s) of task types in Typ.
1961 -- For record types, this procedure recurses over component types.
1963 procedure Collect_Tasks
(Decls
: List_Id
);
1964 -- Collect the types of the tasks that are to be activated in the given
1965 -- list of declarations, in order to perform elaboration checks on the
1966 -- corresponding task procedures which are called implicitly here.
1968 function Outer_Unit
(E
: Entity_Id
) return Entity_Id
;
1969 -- find enclosing compilation unit of Entity, ignoring subunits, or
1970 -- else enclosing subprogram. If E is not a package, there is no need
1971 -- for inter-unit elaboration checks.
1977 procedure Add_Task_Proc
(Typ
: Entity_Id
) is
1979 Proc
: Entity_Id
:= Empty
;
1982 if Is_Task_Type
(Typ
) then
1983 Proc
:= Get_Task_Body_Procedure
(Typ
);
1985 elsif Is_Array_Type
(Typ
)
1986 and then Has_Task
(Base_Type
(Typ
))
1988 Add_Task_Proc
(Component_Type
(Typ
));
1990 elsif Is_Record_Type
(Typ
)
1991 and then Has_Task
(Base_Type
(Typ
))
1993 Comp
:= First_Component
(Typ
);
1994 while Present
(Comp
) loop
1995 Add_Task_Proc
(Etype
(Comp
));
1996 Comp
:= Next_Component
(Comp
);
2000 -- If the task type is another unit, we will perform the usual
2001 -- elaboration check on its enclosing unit. If the type is in the
2002 -- same unit, we can trace the task body as for an internal call,
2003 -- but we only need to examine other external calls, because at
2004 -- the point the task is activated, internal subprogram bodies
2005 -- will have been elaborated already. We keep separate lists for
2006 -- each kind of task.
2008 -- Skip this test if errors have occurred, since in this case
2009 -- we can get false indications.
2011 if Serious_Errors_Detected
/= 0 then
2015 if Present
(Proc
) then
2016 if Outer_Unit
(Scope
(Proc
)) = Enclosing
then
2018 if No
(Corresponding_Body
(Unit_Declaration_Node
(Proc
)))
2020 (not Is_Generic_Instance
(Scope
(Proc
))
2022 Scope
(Proc
) = Scope
(Defining_Identifier
(Decl
)))
2025 ("task will be activated before elaboration of its body?",
2028 ("\Program_Error will be raised at run-time?", Decl
);
2031 Present
(Corresponding_Body
(Unit_Declaration_Node
(Proc
)))
2033 Append_Elmt
(Proc
, Intra_Procs
);
2037 -- No need for multiple entries of the same type
2039 Elmt
:= First_Elmt
(Inter_Procs
);
2040 while Present
(Elmt
) loop
2041 if Node
(Elmt
) = Proc
then
2048 Append_Elmt
(Proc
, Inter_Procs
);
2057 procedure Collect_Tasks
(Decls
: List_Id
) is
2059 if Present
(Decls
) then
2060 Decl
:= First
(Decls
);
2061 while Present
(Decl
) loop
2062 if Nkind
(Decl
) = N_Object_Declaration
2063 and then Has_Task
(Etype
(Defining_Identifier
(Decl
)))
2065 Add_Task_Proc
(Etype
(Defining_Identifier
(Decl
)));
2077 function Outer_Unit
(E
: Entity_Id
) return Entity_Id
is
2082 while Present
(Outer
) loop
2083 if Elaboration_Checks_Suppressed
(Outer
) then
2087 exit when Is_Child_Unit
(Outer
)
2088 or else Scope
(Outer
) = Standard_Standard
2089 or else Ekind
(Outer
) /= E_Package
;
2090 Outer
:= Scope
(Outer
);
2096 -- Start of processing for Check_Task_Activation
2099 Enclosing
:= Outer_Unit
(Current_Scope
);
2101 -- Find all tasks declared in the current unit
2103 if Nkind
(N
) = N_Package_Body
then
2104 P
:= Unit_Declaration_Node
(Corresponding_Spec
(N
));
2106 Collect_Tasks
(Declarations
(N
));
2107 Collect_Tasks
(Visible_Declarations
(Specification
(P
)));
2108 Collect_Tasks
(Private_Declarations
(Specification
(P
)));
2110 elsif Nkind
(N
) = N_Package_Declaration
then
2111 Collect_Tasks
(Visible_Declarations
(Specification
(N
)));
2112 Collect_Tasks
(Private_Declarations
(Specification
(N
)));
2115 Collect_Tasks
(Declarations
(N
));
2118 -- We only perform detailed checks in all tasks are library level
2119 -- entities. If the master is a subprogram or task, activation will
2120 -- depend on the activation of the master itself.
2121 -- Should dynamic checks be added in the more general case???
2123 if Ekind
(Enclosing
) /= E_Package
then
2127 -- For task types defined in other units, we want the unit containing
2128 -- the task body to be elaborated before the current one.
2130 Elmt
:= First_Elmt
(Inter_Procs
);
2131 while Present
(Elmt
) loop
2133 Task_Scope
:= Outer_Unit
(Scope
(Ent
));
2135 if not Is_Compilation_Unit
(Task_Scope
) then
2138 elsif Suppress_Elaboration_Warnings
(Task_Scope
)
2139 or else Elaboration_Checks_Suppressed
(Task_Scope
)
2143 elsif Dynamic_Elaboration_Checks
then
2144 if not Elaboration_Checks_Suppressed
(Ent
)
2145 and then not Cunit_SC
2147 not Restriction_Active
(No_Entry_Calls_In_Elaboration_Code
)
2149 -- Runtime elaboration check required. generate check of the
2150 -- elaboration Boolean for the unit containing the entity.
2152 Insert_Elab_Check
(N
,
2153 Make_Attribute_Reference
(Loc
,
2154 Attribute_Name
=> Name_Elaborated
,
2157 (Spec_Entity
(Task_Scope
), Loc
)));
2161 -- Force the binder to elaborate other unit first
2163 if not Suppress_Elaboration_Warnings
(Ent
)
2164 and then not Elaboration_Checks_Suppressed
(Ent
)
2165 and then Elab_Warnings
2166 and then not Suppress_Elaboration_Warnings
(Task_Scope
)
2167 and then not Elaboration_Checks_Suppressed
(Task_Scope
)
2169 Error_Msg_Node_2
:= Task_Scope
;
2170 Error_Msg_NE
("activation of an instance of task type&" &
2171 " requires pragma Elaborate_All on &?", N
, Ent
);
2174 Activate_Elaborate_All_Desirable
(N
, Task_Scope
);
2175 Set_Suppress_Elaboration_Warnings
(Task_Scope
);
2181 -- For tasks declared in the current unit, trace other calls within
2182 -- the task procedure bodies, which are available.
2184 In_Task_Activation
:= True;
2186 Elmt
:= First_Elmt
(Intra_Procs
);
2187 while Present
(Elmt
) loop
2189 Check_Internal_Call_Continue
(N
, Ent
, Enclosing
, Ent
);
2193 In_Task_Activation
:= False;
2194 end Check_Task_Activation
;
2196 --------------------------------
2197 -- Set_Elaboration_Constraint --
2198 --------------------------------
2200 procedure Set_Elaboration_Constraint
2205 Elab_Unit
: Entity_Id
;
2206 Init_Call
: constant Boolean :=
2207 Chars
(Subp
) = Name_Initialize
2208 and then Comes_From_Source
(Subp
)
2209 and then Present
(Parameter_Associations
(Call
))
2210 and then Is_Controlled
2211 (Etype
(First
(Parameter_Associations
(Call
))));
2213 -- If the unit is mentioned in a with_clause of the current
2214 -- unit, it is visible, and we can set the elaboration flag.
2216 if Is_Immediately_Visible
(Scop
)
2218 (Is_Child_Unit
(Scop
) and then Is_Visible_Child_Unit
(Scop
))
2220 Activate_Elaborate_All_Desirable
(Call
, Scop
);
2221 Set_Suppress_Elaboration_Warnings
(Scop
, True);
2225 -- If this is not an initialization call or a call using object notation
2226 -- we know that the unit of the called entity is in the context, and
2227 -- we can set the flag as well. The unit need not be visible if the call
2228 -- occurs within an instantiation.
2230 if Is_Init_Proc
(Subp
)
2232 or else Nkind
(Original_Node
(Call
)) = N_Selected_Component
2234 null; -- detailed processing follows.
2237 Activate_Elaborate_All_Desirable
(Call
, Scop
);
2238 Set_Suppress_Elaboration_Warnings
(Scop
, True);
2242 -- If the unit is not in the context, there must be an intermediate
2243 -- unit that is, on which we need to place to elaboration flag. This
2244 -- happens with init proc calls.
2246 if Is_Init_Proc
(Subp
)
2249 -- The initialization call is on an object whose type is not
2250 -- declared in the same scope as the subprogram. The type of
2251 -- the object must be a subtype of the type of operation. This
2252 -- object is the first actual in the call.
2255 Typ
: constant Entity_Id
:=
2256 Etype
(First
(Parameter_Associations
(Call
)));
2258 Elab_Unit
:= Scope
(Typ
);
2259 while (Present
(Elab_Unit
))
2260 and then not Is_Compilation_Unit
(Elab_Unit
)
2262 Elab_Unit
:= Scope
(Elab_Unit
);
2266 -- If original node uses selected component notation, the prefix is
2267 -- visible and determines the scope that must be elaborated. After
2268 -- rewriting, the prefix is the first actual in the call.
2270 elsif Nkind
(Original_Node
(Call
)) = N_Selected_Component
then
2271 Elab_Unit
:= Scope
(Etype
(First
(Parameter_Associations
(Call
))));
2273 -- Not one of special cases above
2276 -- Using previously computed scope. If the elaboration check is
2277 -- done after analysis, the scope is not visible any longer, but
2278 -- must still be in the context.
2283 Activate_Elaborate_All_Desirable
(Call
, Elab_Unit
);
2284 Set_Suppress_Elaboration_Warnings
(Elab_Unit
, True);
2285 end Set_Elaboration_Constraint
;
2287 ----------------------
2288 -- Has_Generic_Body --
2289 ----------------------
2291 function Has_Generic_Body
(N
: Node_Id
) return Boolean is
2292 Ent
: constant Entity_Id
:= Get_Generic_Entity
(N
);
2293 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Ent
);
2296 function Find_Body_In
(E
: Entity_Id
; N
: Node_Id
) return Node_Id
;
2297 -- Determine if the list of nodes headed by N and linked by Next
2298 -- contains a package body for the package spec entity E, and if
2299 -- so return the package body. If not, then returns Empty.
2301 function Load_Package_Body
(Nam
: Unit_Name_Type
) return Node_Id
;
2302 -- This procedure is called load the unit whose name is given by Nam.
2303 -- This unit is being loaded to see whether it contains an optional
2304 -- generic body. The returned value is the loaded unit, which is
2305 -- always a package body (only package bodies can contain other
2306 -- entities in the sense in which Has_Generic_Body is interested).
2307 -- We only attempt to load bodies if we are generating code. If we
2308 -- are in semantics check only mode, then it would be wrong to load
2309 -- bodies that are not required from a semantic point of view, so
2310 -- in this case we return Empty. The result is that the caller may
2311 -- incorrectly decide that a generic spec does not have a body when
2312 -- in fact it does, but the only harm in this is that some warnings
2313 -- on elaboration problems may be lost in semantic checks only mode,
2314 -- which is not big loss. We also return Empty if we go for a body
2315 -- and it is not there.
2317 function Locate_Corresponding_Body
(PE
: Entity_Id
) return Node_Id
;
2318 -- PE is the entity for a package spec. This function locates the
2319 -- corresponding package body, returning Empty if none is found.
2320 -- The package body returned is fully parsed but may not yet be
2321 -- analyzed, so only syntactic fields should be referenced.
2327 function Find_Body_In
(E
: Entity_Id
; N
: Node_Id
) return Node_Id
is
2332 while Present
(Nod
) loop
2334 -- If we found the package body we are looking for, return it
2336 if Nkind
(Nod
) = N_Package_Body
2337 and then Chars
(Defining_Unit_Name
(Nod
)) = Chars
(E
)
2341 -- If we found the stub for the body, go after the subunit,
2342 -- loading it if necessary.
2344 elsif Nkind
(Nod
) = N_Package_Body_Stub
2345 and then Chars
(Defining_Identifier
(Nod
)) = Chars
(E
)
2347 if Present
(Library_Unit
(Nod
)) then
2348 return Unit
(Library_Unit
(Nod
));
2351 return Load_Package_Body
(Get_Unit_Name
(Nod
));
2354 -- If neither package body nor stub, keep looking on chain
2364 -----------------------
2365 -- Load_Package_Body --
2366 -----------------------
2368 function Load_Package_Body
(Nam
: Unit_Name_Type
) return Node_Id
is
2369 U
: Unit_Number_Type
;
2372 if Operating_Mode
/= Generate_Code
then
2385 return Unit
(Cunit
(U
));
2388 end Load_Package_Body
;
2390 -------------------------------
2391 -- Locate_Corresponding_Body --
2392 -------------------------------
2394 function Locate_Corresponding_Body
(PE
: Entity_Id
) return Node_Id
is
2395 Spec
: constant Node_Id
:= Declaration_Node
(PE
);
2396 Decl
: constant Node_Id
:= Parent
(Spec
);
2397 Scop
: constant Entity_Id
:= Scope
(PE
);
2401 if Is_Library_Level_Entity
(PE
) then
2403 -- If package is a library unit that requires a body, we have
2404 -- no choice but to go after that body because it might contain
2405 -- an optional body for the original generic package.
2407 if Unit_Requires_Body
(PE
) then
2409 -- Load the body. Note that we are a little careful here to
2410 -- use Spec to get the unit number, rather than PE or Decl,
2411 -- since in the case where the package is itself a library
2412 -- level instantiation, Spec will properly reference the
2413 -- generic template, which is what we really want.
2417 (Get_Body_Name
(Unit_Name
(Get_Source_Unit
(Spec
))));
2419 -- But if the package is a library unit that does NOT require
2420 -- a body, then no body is permitted, so we are sure that there
2421 -- is no body for the original generic package.
2427 -- Otherwise look and see if we are embedded in a further package
2429 elsif Is_Package_Or_Generic_Package
(Scop
) then
2431 -- If so, get the body of the enclosing package, and look in
2432 -- its package body for the package body we are looking for.
2434 PBody
:= Locate_Corresponding_Body
(Scop
);
2439 return Find_Body_In
(PE
, First
(Declarations
(PBody
)));
2442 -- If we are not embedded in a further package, then the body
2443 -- must be in the same declarative part as we are.
2446 return Find_Body_In
(PE
, Next
(Decl
));
2448 end Locate_Corresponding_Body
;
2450 -- Start of processing for Has_Generic_Body
2453 if Present
(Corresponding_Body
(Decl
)) then
2456 elsif Unit_Requires_Body
(Ent
) then
2459 -- Compilation units cannot have optional bodies
2461 elsif Is_Compilation_Unit
(Ent
) then
2464 -- Otherwise look at what scope we are in
2467 Scop
:= Scope
(Ent
);
2469 -- Case of entity is in other than a package spec, in this case
2470 -- the body, if present, must be in the same declarative part.
2472 if not Is_Package_Or_Generic_Package
(Scop
) then
2477 -- Declaration node may get us a spec, so if so, go to
2478 -- the parent declaration.
2480 P
:= Declaration_Node
(Ent
);
2481 while not Is_List_Member
(P
) loop
2485 return Present
(Find_Body_In
(Ent
, Next
(P
)));
2488 -- If the entity is in a package spec, then we have to locate
2489 -- the corresponding package body, and look there.
2493 PBody
: constant Node_Id
:= Locate_Corresponding_Body
(Scop
);
2501 (Find_Body_In
(Ent
, (First
(Declarations
(PBody
)))));
2506 end Has_Generic_Body
;
2508 -----------------------
2509 -- Insert_Elab_Check --
2510 -----------------------
2512 procedure Insert_Elab_Check
(N
: Node_Id
; C
: Node_Id
:= Empty
) is
2514 Loc
: constant Source_Ptr
:= Sloc
(N
);
2517 -- If expansion is disabled, do not generate any checks. Also
2518 -- skip checks if any subunits are missing because in either
2519 -- case we lack the full information that we need, and no object
2520 -- file will be created in any case.
2522 if not Expander_Active
or else Subunits_Missing
then
2526 -- If we have a generic instantiation, where Instance_Spec is set,
2527 -- then this field points to a generic instance spec that has
2528 -- been inserted before the instantiation node itself, so that
2529 -- is where we want to insert a check.
2531 if Nkind
(N
) in N_Generic_Instantiation
2532 and then Present
(Instance_Spec
(N
))
2534 Nod
:= Instance_Spec
(N
);
2539 -- If we are inserting at the top level, insert in Aux_Decls
2541 if Nkind
(Parent
(Nod
)) = N_Compilation_Unit
then
2543 ADN
: constant Node_Id
:= Aux_Decls_Node
(Parent
(Nod
));
2549 Make_Raise_Program_Error
(Loc
,
2550 Reason
=> PE_Access_Before_Elaboration
);
2553 Make_Raise_Program_Error
(Loc
,
2554 Condition
=> Make_Op_Not
(Loc
, C
),
2555 Reason
=> PE_Access_Before_Elaboration
);
2558 if No
(Declarations
(ADN
)) then
2559 Set_Declarations
(ADN
, New_List
(R
));
2561 Append_To
(Declarations
(ADN
), R
);
2567 -- Otherwise just insert before the node in question. However, if
2568 -- the context of the call has already been analyzed, an insertion
2569 -- will not work if it depends on subsequent expansion (e.g. a call in
2570 -- a branch of a short-circuit). In that case we replace the call with
2571 -- a conditional expression, or with a Raise if it is unconditional.
2572 -- Unfortunately this does not work if the call has a dynamic size,
2573 -- because gigi regards it as a dynamic-sized temporary. If such a call
2574 -- appears in a short-circuit expression, the elaboration check will be
2575 -- missed (rare enough ???). Otherwise, the code below inserts the check
2576 -- at the appropriate place before the call. Same applies in the even
2577 -- rarer case the return type has a known size but is unconstrained.
2580 if Nkind
(N
) = N_Function_Call
2581 and then Analyzed
(Parent
(N
))
2582 and then Size_Known_At_Compile_Time
(Etype
(N
))
2584 (not Has_Discriminants
(Etype
(N
))
2585 or else Is_Constrained
(Etype
(N
)))
2589 Typ
: constant Entity_Id
:= Etype
(N
);
2590 Chk
: constant Boolean := Do_Range_Check
(N
);
2592 R
: constant Node_Id
:=
2593 Make_Raise_Program_Error
(Loc
,
2594 Reason
=> PE_Access_Before_Elaboration
);
2604 Make_Conditional_Expression
(Loc
,
2605 Expressions
=> New_List
(C
, Relocate_Node
(N
), R
)));
2608 Analyze_And_Resolve
(N
, Typ
);
2610 -- If the original call requires a range check, so does the
2611 -- conditional expression.
2614 Enable_Range_Check
(N
);
2616 Set_Do_Range_Check
(N
, False);
2623 Make_Raise_Program_Error
(Loc
,
2624 Reason
=> PE_Access_Before_Elaboration
));
2627 Make_Raise_Program_Error
(Loc
,
2631 Reason
=> PE_Access_Before_Elaboration
));
2635 end Insert_Elab_Check
;
2641 procedure Output_Calls
(N
: Node_Id
) is
2644 function Is_Printable_Error_Name
(Nm
: Name_Id
) return Boolean;
2645 -- An internal function, used to determine if a name, Nm, is either
2646 -- a non-internal name, or is an internal name that is printable
2647 -- by the error message circuits (i.e. it has a single upper
2648 -- case letter at the end).
2650 function Is_Printable_Error_Name
(Nm
: Name_Id
) return Boolean is
2652 if not Is_Internal_Name
(Nm
) then
2655 elsif Name_Len
= 1 then
2659 Name_Len
:= Name_Len
- 1;
2660 return not Is_Internal_Name
;
2662 end Is_Printable_Error_Name
;
2664 -- Start of processing for Output_Calls
2667 for J
in reverse 1 .. Elab_Call
.Last
loop
2668 Error_Msg_Sloc
:= Elab_Call
.Table
(J
).Cloc
;
2670 Ent
:= Elab_Call
.Table
(J
).Ent
;
2672 if Is_Generic_Unit
(Ent
) then
2673 Error_Msg_NE
("\?& instantiated #", N
, Ent
);
2675 elsif Is_Init_Proc
(Ent
) then
2676 Error_Msg_N
("\?initialization procedure called #", N
);
2678 elsif Is_Printable_Error_Name
(Chars
(Ent
)) then
2679 Error_Msg_NE
("\?& called #", N
, Ent
);
2682 Error_Msg_N
("\? called #", N
);
2687 ----------------------------
2688 -- Same_Elaboration_Scope --
2689 ----------------------------
2691 function Same_Elaboration_Scope
(Scop1
, Scop2
: Entity_Id
) return Boolean is
2696 -- Find elaboration scope for Scop1
2697 -- This is either a subprogram or a compilation unit.
2700 while S1
/= Standard_Standard
2701 and then not Is_Compilation_Unit
(S1
)
2702 and then (Ekind
(S1
) = E_Package
2704 Ekind
(S1
) = E_Protected_Type
2706 Ekind
(S1
) = E_Block
)
2711 -- Find elaboration scope for Scop2
2714 while S2
/= Standard_Standard
2715 and then not Is_Compilation_Unit
(S2
)
2716 and then (Ekind
(S2
) = E_Package
2718 Ekind
(S2
) = E_Protected_Type
2720 Ekind
(S2
) = E_Block
)
2726 end Same_Elaboration_Scope
;
2732 procedure Set_C_Scope
is
2734 while not Is_Compilation_Unit
(C_Scope
) loop
2735 C_Scope
:= Scope
(C_Scope
);
2743 function Spec_Entity
(E
: Entity_Id
) return Entity_Id
is
2747 -- Check for case of body entity
2748 -- Why is the check for E_Void needed???
2750 if Ekind
(E
) = E_Void
2751 or else Ekind
(E
) = E_Subprogram_Body
2752 or else Ekind
(E
) = E_Package_Body
2757 Decl
:= Parent
(Decl
);
2758 exit when Nkind
(Decl
) in N_Proper_Body
;
2761 return Corresponding_Spec
(Decl
);
2772 procedure Supply_Bodies
(N
: Node_Id
) is
2774 if Nkind
(N
) = N_Subprogram_Declaration
then
2776 Ent
: constant Entity_Id
:= Defining_Unit_Name
(Specification
(N
));
2778 Set_Is_Imported
(Ent
);
2779 Set_Convention
(Ent
, Convention_Stubbed
);
2782 elsif Nkind
(N
) = N_Package_Declaration
then
2784 Spec
: constant Node_Id
:= Specification
(N
);
2786 New_Scope
(Defining_Unit_Name
(Spec
));
2787 Supply_Bodies
(Visible_Declarations
(Spec
));
2788 Supply_Bodies
(Private_Declarations
(Spec
));
2794 procedure Supply_Bodies
(L
: List_Id
) is
2799 while Present
(Elmt
) loop
2800 Supply_Bodies
(Elmt
);
2810 function Within
(E1
, E2
: Entity_Id
) return Boolean is
2819 elsif Scop
= Standard_Standard
then
2823 Scop
:= Scope
(Scop
);
2827 raise Program_Error
;
2830 --------------------------
2831 -- Within_Elaborate_All --
2832 --------------------------
2834 function Within_Elaborate_All
(E
: Entity_Id
) return Boolean is
2837 Elab_Id
: Entity_Id
;
2841 Item
:= First
(Context_Items
(Cunit
(Current_Sem_Unit
)));
2842 while Present
(Item
) loop
2843 if Nkind
(Item
) = N_Pragma
2844 and then Get_Pragma_Id
(Chars
(Item
)) = Pragma_Elaborate_All
2846 -- Return if some previous error on the pragma itself
2848 if Error_Posted
(Item
) then
2854 (Expression
(First
(Pragma_Argument_Associations
(Item
))));
2856 Par
:= Parent
(Unit_Declaration_Node
(Elab_Id
));
2858 Item2
:= First
(Context_Items
(Par
));
2859 while Present
(Item2
) loop
2860 if Nkind
(Item2
) = N_With_Clause
2861 and then Entity
(Name
(Item2
)) = E
2874 end Within_Elaborate_All
;