1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1997-2010, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree
; use Atree
;
27 with Checks
; use Checks
;
28 with Debug
; use Debug
;
29 with Einfo
; use Einfo
;
30 with Elists
; use Elists
;
31 with Errout
; use Errout
;
32 with Exp_Tss
; use Exp_Tss
;
33 with Exp_Util
; use Exp_Util
;
34 with Expander
; use Expander
;
35 with Fname
; use Fname
;
37 with Lib
.Load
; use Lib
.Load
;
38 with Namet
; use Namet
;
39 with Nlists
; use Nlists
;
40 with Nmake
; use Nmake
;
42 with Output
; use Output
;
43 with Restrict
; use Restrict
;
44 with Rident
; use Rident
;
46 with Sem_Cat
; use Sem_Cat
;
47 with Sem_Ch7
; use Sem_Ch7
;
48 with Sem_Ch8
; use Sem_Ch8
;
49 with Sem_Res
; use Sem_Res
;
50 with Sem_Type
; use Sem_Type
;
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 in the
63 -- Output routine. Each entry records the call node and the entity of the
64 -- called routine. The number of entries in the table (i.e. the value of
65 -- Elab_Call.Last) indicates the current depth of recursion and is used to
66 -- identify the outer level.
68 type Elab_Call_Entry
is record
73 package Elab_Call
is new Table
.Table
(
74 Table_Component_Type
=> Elab_Call_Entry
,
75 Table_Index_Type
=> Int
,
78 Table_Increment
=> 100,
79 Table_Name
=> "Elab_Call");
81 -- This table is initialized at the start of each outer level call. It
82 -- holds the entities for all subprograms that have been examined for this
83 -- particular outer level call, and is used to prevent both infinite
84 -- recursion, and useless reanalysis of bodies already seen
86 package Elab_Visited
is new Table
.Table
(
87 Table_Component_Type
=> Entity_Id
,
88 Table_Index_Type
=> Int
,
91 Table_Increment
=> 100,
92 Table_Name
=> "Elab_Visited");
94 -- This table stores calls to Check_Internal_Call that are delayed
95 -- until all generics are instantiated, and in particular that all
96 -- generic bodies have been inserted. We need to delay, because we
97 -- need to be able to look through the inserted bodies.
99 type Delay_Element
is record
101 -- The parameter N from the call to Check_Internal_Call. Note that
102 -- this node may get rewritten over the delay period by expansion
103 -- in the call case (but not in the instantiation case).
106 -- The parameter E from the call to Check_Internal_Call
108 Orig_Ent
: Entity_Id
;
109 -- The parameter Orig_Ent from the call to Check_Internal_Call
112 -- The current scope of the call. This is restored when we complete
113 -- the delayed call, so that we do this in the right scope.
115 From_Elab_Code
: Boolean;
116 -- Save indication of whether this call is from elaboration code
118 Outer_Scope
: Entity_Id
;
119 -- Save scope of outer level call
122 package Delay_Check
is new Table
.Table
(
123 Table_Component_Type
=> Delay_Element
,
124 Table_Index_Type
=> Int
,
125 Table_Low_Bound
=> 1,
126 Table_Initial
=> 1000,
127 Table_Increment
=> 100,
128 Table_Name
=> "Delay_Check");
131 -- Top level scope of current scope. Compute this only once at the outer
132 -- level, i.e. for a call to Check_Elab_Call from outside this unit.
134 Outer_Level_Sloc
: Source_Ptr
;
135 -- Save Sloc value for outer level call node for comparisons of source
136 -- locations. A body is too late if it appears after the *outer* level
137 -- call, not the particular call that is being analyzed.
139 From_Elab_Code
: Boolean;
140 -- This flag shows whether the outer level call currently being examined
141 -- is or is not in elaboration code. We are only interested in calls to
142 -- routines in other units if this flag is True.
144 In_Task_Activation
: Boolean := False;
145 -- This flag indicates whether we are performing elaboration checks on
146 -- task procedures, at the point of activation. If true, we do not trace
147 -- internal calls in these procedures, because all local bodies are known
150 Delaying_Elab_Checks
: Boolean := True;
151 -- This is set True till the compilation is complete, including the
152 -- insertion of all instance bodies. Then when Check_Elab_Calls is called,
153 -- the delay table is used to make the delayed calls and this flag is reset
154 -- to False, so that the calls are processed
156 -----------------------
157 -- Local Subprograms --
158 -----------------------
160 -- Note: Outer_Scope in all following specs represents the scope of
161 -- interest of the outer level call. If it is set to Standard_Standard,
162 -- then it means the outer level call was at elaboration level, and that
163 -- thus all calls are of interest. If it was set to some other scope,
164 -- then the original call was an inner call, and we are not interested
165 -- in calls that go outside this scope.
167 procedure Activate_Elaborate_All_Desirable
(N
: Node_Id
; U
: Entity_Id
);
168 -- Analysis of construct N shows that we should set Elaborate_All_Desirable
169 -- for the WITH clause for unit U (which will always be present). A special
170 -- case is when N is a function or procedure instantiation, in which case
171 -- it is sufficient to set Elaborate_Desirable, since in this case there is
172 -- no possibility of transitive elaboration issues.
174 procedure Check_A_Call
177 Outer_Scope
: Entity_Id
;
178 Inter_Unit_Only
: Boolean;
179 Generate_Warnings
: Boolean := True);
180 -- This is the internal recursive routine that is called to check for a
181 -- possible elaboration error. The argument N is a subprogram call or
182 -- generic instantiation to be checked, and E is the entity of the called
183 -- subprogram, or instantiated generic unit. The flag Outer_Scope is the
184 -- outer level scope for the original call. Inter_Unit_Only is set if the
185 -- call is only to be checked in the case where it is to another unit (and
186 -- skipped if within a unit). Generate_Warnings is set to False to suppress
187 -- warning messages about missing pragma Elaborate_All's. These messages
188 -- are not wanted for inner calls in the dynamic model.
190 procedure Check_Bad_Instantiation
(N
: Node_Id
);
191 -- N is a node for an instantiation (if called with any other node kind,
192 -- Check_Bad_Instantiation ignores the call). This subprogram checks for
193 -- the special case of a generic instantiation of a generic spec in the
194 -- same declarative part as the instantiation where a body is present and
195 -- has not yet been seen. This is an obvious error, but needs to be checked
196 -- specially at the time of the instantiation, since it is a case where we
197 -- cannot insert the body anywhere. If this case is detected, warnings are
198 -- generated, and a raise of Program_Error is inserted. In addition any
199 -- subprograms in the generic spec are stubbed, and the Bad_Instantiation
200 -- flag is set on the instantiation node. The caller in Sem_Ch12 uses this
201 -- flag as an indication that no attempt should be made to insert an
204 procedure Check_Internal_Call
207 Outer_Scope
: Entity_Id
;
208 Orig_Ent
: Entity_Id
);
209 -- N is a function call or procedure statement call node and E is the
210 -- entity of the called function, which is within the current compilation
211 -- unit (where subunits count as part of the parent). This call checks if
212 -- this call, or any call within any accessed body could cause an ABE, and
213 -- if so, outputs a warning. Orig_Ent differs from E only in the case of
214 -- renamings, and points to the original name of the entity. This is used
215 -- for error messages. Outer_Scope is the outer level scope for the
218 procedure Check_Internal_Call_Continue
221 Outer_Scope
: Entity_Id
;
222 Orig_Ent
: Entity_Id
);
223 -- The processing for Check_Internal_Call is divided up into two phases,
224 -- and this represents the second phase. The second phase is delayed if
225 -- Delaying_Elab_Calls is set to True. In this delayed case, the first
226 -- phase makes an entry in the Delay_Check table, which is processed when
227 -- Check_Elab_Calls is called. N, E and Orig_Ent are as for the call to
228 -- Check_Internal_Call. Outer_Scope is the outer level scope for the
231 procedure Set_Elaboration_Constraint
235 -- The current unit U may depend semantically on some unit P which is not
236 -- in the current context. If there is an elaboration call that reaches P,
237 -- we need to indicate that P requires an Elaborate_All, but this is not
238 -- effective in U's ali file, if there is no with_clause for P. In this
239 -- case we add the Elaborate_All on the unit Q that directly or indirectly
240 -- makes P available. This can happen in two cases:
242 -- a) Q declares a subtype of a type declared in P, and the call is an
243 -- initialization call for an object of that subtype.
245 -- b) Q declares an object of some tagged type whose root type is
246 -- declared in P, and the initialization call uses object notation on
247 -- that object to reach a primitive operation or a classwide operation
250 -- If P appears in the context of U, the current processing is correct.
251 -- Otherwise we must identify these two cases to retrieve Q and place the
252 -- Elaborate_All_Desirable on it.
254 function Has_Generic_Body
(N
: Node_Id
) return Boolean;
255 -- N is a generic package instantiation node, and this routine determines
256 -- if this package spec does in fact have a generic body. If so, then
257 -- True is returned, otherwise False. Note that this is not at all the
258 -- same as checking if the unit requires a body, since it deals with
259 -- the case of optional bodies accurately (i.e. if a body is optional,
260 -- then it looks to see if a body is actually present). Note: this
261 -- function can only do a fully correct job if in generating code mode
262 -- where all bodies have to be present. If we are operating in semantics
263 -- check only mode, then in some cases of optional bodies, a result of
264 -- False may incorrectly be given. In practice this simply means that
265 -- some cases of warnings for incorrect order of elaboration will only
266 -- be given when generating code, which is not a big problem (and is
267 -- inevitable, given the optional body semantics of Ada).
269 procedure Insert_Elab_Check
(N
: Node_Id
; C
: Node_Id
:= Empty
);
270 -- Given code for an elaboration check (or unconditional raise if the check
271 -- is not needed), inserts the code in the appropriate place. N is the call
272 -- or instantiation node for which the check code is required. C is the
273 -- test whose failure triggers the raise.
275 procedure Output_Calls
(N
: Node_Id
);
276 -- Outputs chain of calls stored in the Elab_Call table. The caller has
277 -- already generated the main warning message, so the warnings generated
278 -- are all continuation messages. The argument is the call node at which
279 -- the messages are to be placed.
281 function Same_Elaboration_Scope
(Scop1
, Scop2
: Entity_Id
) return Boolean;
282 -- Given two scopes, determine whether they are the same scope from an
283 -- elaboration point of view, i.e. packages and blocks are ignored.
285 procedure Set_C_Scope
;
286 -- On entry C_Scope is set to some scope. On return, C_Scope is reset
287 -- to be the enclosing compilation unit of this scope.
289 function Spec_Entity
(E
: Entity_Id
) return Entity_Id
;
290 -- Given a compilation unit entity, if it is a spec entity, it is returned
291 -- unchanged. If it is a body entity, then the spec for the corresponding
294 procedure Supply_Bodies
(N
: Node_Id
);
295 -- Given a node, N, that is either a subprogram declaration or a package
296 -- declaration, this procedure supplies dummy bodies for the subprogram
297 -- or for all subprograms in the package. If the given node is not one
298 -- of these two possibilities, then Supply_Bodies does nothing. The
299 -- dummy body contains a single Raise statement.
301 procedure Supply_Bodies
(L
: List_Id
);
302 -- Calls Supply_Bodies for all elements of the given list L
304 function Within
(E1
, E2
: Entity_Id
) return Boolean;
305 -- Given two scopes E1 and E2, returns True if E1 is equal to E2, or is one
306 -- of its contained scopes, False otherwise.
308 function Within_Elaborate_All
(E
: Entity_Id
) return Boolean;
309 -- Before emitting a warning on a scope E for a missing elaborate_all,
310 -- check whether E may be in the context of a directly visible unit U to
311 -- which the pragma applies. This prevents spurious warnings when the
312 -- called entity is renamed within U.
314 --------------------------------------
315 -- Activate_Elaborate_All_Desirable --
316 --------------------------------------
318 procedure Activate_Elaborate_All_Desirable
(N
: Node_Id
; U
: Entity_Id
) is
319 UN
: constant Unit_Number_Type
:= Get_Code_Unit
(N
);
320 CU
: constant Node_Id
:= Cunit
(UN
);
321 UE
: constant Entity_Id
:= Cunit_Entity
(UN
);
322 Unm
: constant Unit_Name_Type
:= Unit_Name
(UN
);
323 CI
: constant List_Id
:= Context_Items
(CU
);
327 procedure Add_To_Context_And_Mark
(Itm
: Node_Id
);
328 -- This procedure is called when the elaborate indication must be
329 -- applied to a unit not in the context of the referencing unit. The
330 -- unit gets added to the context as an implicit with.
332 function In_Withs_Of
(UEs
: Entity_Id
) return Boolean;
333 -- UEs is the spec entity of a unit. If the unit to be marked is
334 -- in the context item list of this unit spec, then the call returns
335 -- True and Itm is left set to point to the relevant N_With_Clause node.
337 procedure Set_Elab_Flag
(Itm
: Node_Id
);
338 -- Sets Elaborate_[All_]Desirable as appropriate on Itm
340 -----------------------------
341 -- Add_To_Context_And_Mark --
342 -----------------------------
344 procedure Add_To_Context_And_Mark
(Itm
: Node_Id
) is
345 CW
: constant Node_Id
:=
346 Make_With_Clause
(Sloc
(Itm
),
350 Set_Library_Unit
(CW
, Library_Unit
(Itm
));
351 Set_Implicit_With
(CW
, True);
353 -- Set elaborate all desirable on copy and then append the copy to
354 -- the list of body with's and we are done.
358 end Add_To_Context_And_Mark
;
364 function In_Withs_Of
(UEs
: Entity_Id
) return Boolean is
365 UNs
: constant Unit_Number_Type
:= Get_Source_Unit
(UEs
);
366 CUs
: constant Node_Id
:= Cunit
(UNs
);
367 CIs
: constant List_Id
:= Context_Items
(CUs
);
371 while Present
(Itm
) loop
372 if Nkind
(Itm
) = N_With_Clause
then
374 Cunit_Entity
(Get_Cunit_Unit_Number
(Library_Unit
(Itm
)));
391 procedure Set_Elab_Flag
(Itm
: Node_Id
) is
393 if Nkind
(N
) in N_Subprogram_Instantiation
then
394 Set_Elaborate_Desirable
(Itm
);
396 Set_Elaborate_All_Desirable
(Itm
);
400 -- Start of processing for Activate_Elaborate_All_Desirable
403 -- Do not set binder indication if expansion is disabled, as when
404 -- compiling a generic unit.
406 if not Expander_Active
then
411 while Present
(Itm
) loop
412 if Nkind
(Itm
) = N_With_Clause
then
413 Ent
:= Cunit_Entity
(Get_Cunit_Unit_Number
(Library_Unit
(Itm
)));
415 -- If we find it, then mark elaborate all desirable and return
426 -- If we fall through then the with clause is not present in the
427 -- current unit. One legitimate possibility is that the with clause
428 -- is present in the spec when we are a body.
430 if Is_Body_Name
(Unm
)
431 and then In_Withs_Of
(Spec_Entity
(UE
))
433 Add_To_Context_And_Mark
(Itm
);
437 -- Similarly, we may be in the spec or body of a child unit, where
438 -- the unit in question is with'ed by some ancestor of the child unit.
440 if Is_Child_Name
(Unm
) then
448 exit when Pkg
= Standard_Standard
;
450 if In_Withs_Of
(Pkg
) then
451 Add_To_Context_And_Mark
(Itm
);
458 -- Here if we do not find with clause on spec or body. We just ignore
459 -- this case, it means that the elaboration involves some other unit
460 -- than the unit being compiled, and will be caught elsewhere.
463 end Activate_Elaborate_All_Desirable
;
469 procedure Check_A_Call
472 Outer_Scope
: Entity_Id
;
473 Inter_Unit_Only
: Boolean;
474 Generate_Warnings
: Boolean := True)
476 Loc
: constant Source_Ptr
:= Sloc
(N
);
481 -- Top level scope of entity for called subprogram. This value includes
482 -- following renamings and derivations, so this scope can be in a
483 -- non-visible unit. This is the scope that is to be investigated to
484 -- see whether an elaboration check is required.
487 -- Top level scope of directly called entity for subprogram. This
488 -- differs from E_Scope in the case where renamings or derivations
489 -- are involved, since it does not follow these links. W_Scope is
490 -- generally in a visible unit, and it is this scope that may require
491 -- an Elaborate_All. However, there are some cases (initialization
492 -- calls and calls involving object notation) where W_Scope might not
493 -- be in the context of the current unit, and there is an intermediate
494 -- package that is, in which case the Elaborate_All has to be placed
495 -- on this intermediate package. These special cases are handled in
496 -- Set_Elaboration_Constraint.
498 Body_Acts_As_Spec
: Boolean;
499 -- Set to true if call is to body acting as spec (no separate spec)
501 Inst_Case
: constant Boolean := Nkind
(N
) in N_Generic_Instantiation
;
502 -- Indicates if we have instantiation case
504 Caller_Unit_Internal
: Boolean;
505 Callee_Unit_Internal
: Boolean;
507 Inst_Caller
: Source_Ptr
;
508 Inst_Callee
: Source_Ptr
;
510 Unit_Caller
: Unit_Number_Type
;
511 Unit_Callee
: Unit_Number_Type
;
513 Cunit_SC
: Boolean := False;
514 -- Set to suppress dynamic elaboration checks where one of the
515 -- enclosing scopes has Elaboration_Checks_Suppressed set, or else
516 -- if a pragma Elaborate (_All) applies to that scope, in which case
517 -- warnings on the scope are also suppressed. For the internal case,
518 -- we ignore this flag.
521 -- If the call is known to be within a local Suppress Elaboration
522 -- pragma, nothing to check. This can happen in task bodies.
524 if (Nkind
(N
) = N_Function_Call
525 or else Nkind
(N
) = N_Procedure_Call_Statement
)
526 and then No_Elaboration_Check
(N
)
531 -- Go to parent for derived subprogram, or to original subprogram in the
532 -- case of a renaming (Alias covers both these cases).
536 if (Suppress_Elaboration_Warnings
(Ent
)
537 or else Elaboration_Checks_Suppressed
(Ent
))
538 and then (Inst_Case
or else No
(Alias
(Ent
)))
543 -- Nothing to do for imported entities
545 if Is_Imported
(Ent
) then
549 exit when Inst_Case
or else No
(Alias
(Ent
));
553 Decl
:= Unit_Declaration_Node
(Ent
);
555 if Nkind
(Decl
) = N_Subprogram_Body
then
556 Body_Acts_As_Spec
:= True;
558 elsif Nkind
(Decl
) = N_Subprogram_Declaration
559 or else Nkind
(Decl
) = N_Subprogram_Body_Stub
562 Body_Acts_As_Spec
:= False;
564 -- If we have none of an instantiation, subprogram body or
565 -- subprogram declaration, then it is not a case that we want
566 -- to check. (One case is a call to a generic formal subprogram,
567 -- where we do not want the check in the template).
575 if Elaboration_Checks_Suppressed
(E_Scope
)
576 or else Suppress_Elaboration_Warnings
(E_Scope
)
581 -- Exit when we get to compilation unit, not counting subunits
583 exit when Is_Compilation_Unit
(E_Scope
)
584 and then (Is_Child_Unit
(E_Scope
)
585 or else Scope
(E_Scope
) = Standard_Standard
);
587 -- If we did not find a compilation unit, other than standard,
588 -- then nothing to check (happens in some instantiation cases)
590 if E_Scope
= Standard_Standard
then
593 -- Otherwise move up a scope looking for compilation unit
596 E_Scope
:= Scope
(E_Scope
);
600 -- No checks needed for pure or preelaborated compilation units
602 if Is_Pure
(E_Scope
) or else Is_Preelaborated
(E_Scope
) then
606 -- If the generic entity is within a deeper instance than we are, then
607 -- either the instantiation to which we refer itself caused an ABE, in
608 -- which case that will be handled separately, or else we know that the
609 -- body we need appears as needed at the point of the instantiation.
610 -- However, this assumption is only valid if we are in static mode.
612 if not Dynamic_Elaboration_Checks
613 and then Instantiation_Depth
(Sloc
(Ent
)) >
614 Instantiation_Depth
(Sloc
(N
))
619 -- Do not give a warning for a package with no body
621 if Ekind
(Ent
) = E_Generic_Package
622 and then not Has_Generic_Body
(N
)
627 -- Case of entity is not in current unit (i.e. with'ed unit case)
629 if E_Scope
/= C_Scope
then
631 -- We are only interested in such calls if the outer call was from
632 -- elaboration code, or if we are in Dynamic_Elaboration_Checks mode.
634 if not From_Elab_Code
and then not Dynamic_Elaboration_Checks
then
638 -- Nothing to do if some scope said that no checks were required
644 -- Nothing to do for a generic instance, because in this case the
645 -- checking was at the point of instantiation of the generic However,
646 -- this shortcut is only applicable in static mode.
648 if Is_Generic_Instance
(Ent
) and not Dynamic_Elaboration_Checks
then
652 -- Nothing to do if subprogram with no separate spec. However, a
653 -- call to Deep_Initialize may result in a call to a user-defined
654 -- Initialize procedure, which imposes a body dependency. This
655 -- happens only if the type is controlled and the Initialize
656 -- procedure is not inherited.
658 if Body_Acts_As_Spec
then
659 if Is_TSS
(Ent
, TSS_Deep_Initialize
) then
664 Typ
:= Etype
(Next_Formal
(First_Formal
(Ent
)));
666 if not Is_Controlled
(Typ
) then
669 Init
:= Find_Prim_Op
(Typ
, Name_Initialize
);
671 if Comes_From_Source
(Init
) then
684 -- Check cases of internal units
686 Callee_Unit_Internal
:=
687 Is_Internal_File_Name
688 (Unit_File_Name
(Get_Source_Unit
(E_Scope
)));
690 -- Do not give a warning if the with'ed unit is internal
691 -- and this is the generic instantiation case (this saves a
692 -- lot of hassle dealing with the Text_IO special child units)
694 if Callee_Unit_Internal
and Inst_Case
then
698 if C_Scope
= Standard_Standard
then
699 Caller_Unit_Internal
:= False;
701 Caller_Unit_Internal
:=
702 Is_Internal_File_Name
703 (Unit_File_Name
(Get_Source_Unit
(C_Scope
)));
706 -- Do not give a warning if the with'ed unit is internal
707 -- and the caller is not internal (since the binder always
708 -- elaborates internal units first).
710 if Callee_Unit_Internal
and (not Caller_Unit_Internal
) then
714 -- For now, if debug flag -gnatdE is not set, do no checking for
715 -- one internal unit withing another. This fixes the problem with
716 -- the sgi build and storage errors. To be resolved later ???
718 if (Callee_Unit_Internal
and Caller_Unit_Internal
)
719 and then not Debug_Flag_EE
724 if Is_TSS
(E
, TSS_Deep_Initialize
) then
728 -- If the call is in an instance, and the called entity is not
729 -- defined in the same instance, then the elaboration issue
730 -- focuses around the unit containing the template, it is
731 -- this unit which requires an Elaborate_All.
733 -- However, if we are doing dynamic elaboration, we need to
734 -- chase the call in the usual manner.
736 -- We do not handle the case of calling a generic formal correctly
737 -- in the static case. See test 4703-004 to explore this gap ???
739 Inst_Caller
:= Instantiation
(Get_Source_File_Index
(Sloc
(N
)));
740 Inst_Callee
:= Instantiation
(Get_Source_File_Index
(Sloc
(Ent
)));
742 if Inst_Caller
= No_Location
then
743 Unit_Caller
:= No_Unit
;
745 Unit_Caller
:= Get_Source_Unit
(N
);
748 if Inst_Callee
= No_Location
then
749 Unit_Callee
:= No_Unit
;
751 Unit_Callee
:= Get_Source_Unit
(Ent
);
754 if Unit_Caller
/= No_Unit
755 and then Unit_Callee
/= Unit_Caller
756 and then not Dynamic_Elaboration_Checks
758 E_Scope
:= Spec_Entity
(Cunit_Entity
(Unit_Caller
));
760 -- If we don't get a spec entity, just ignore call. Not quite
761 -- clear why this check is necessary. ???
767 -- Otherwise step to enclosing compilation unit
769 while not Is_Compilation_Unit
(E_Scope
) loop
770 E_Scope
:= Scope
(E_Scope
);
773 -- For the case N is not an instance, or a call within instance, we
774 -- recompute E_Scope for the error message, since we do NOT want to
775 -- go to the unit which has the ultimate declaration in the case of
776 -- renaming and derivation and we also want to go to the generic unit
777 -- in the case of an instance, and no further.
780 -- Loop to carefully follow renamings and derivations one step
781 -- 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
845 Generate_Elab_Warnings
: declare
846 procedure Elab_Warning
849 Ent
: Node_Or_Entity_Id
);
850 -- Generate a call to Error_Msg_NE with parameters Msg_D or
851 -- Msg_S (for dynamic or static elaboration model), N and Ent.
857 procedure Elab_Warning
860 Ent
: Node_Or_Entity_Id
)
863 if Dynamic_Elaboration_Checks
then
864 Error_Msg_NE
(Msg_D
, N
, Ent
);
866 Error_Msg_NE
(Msg_S
, N
, Ent
);
870 -- Start of processing for Generate_Elab_Warnings
875 ("instantiation of& may raise Program_Error?",
876 "info: instantiation of& during elaboration?", Ent
);
879 if Nkind
(Name
(N
)) in N_Has_Entity
880 and then Is_Init_Proc
(Entity
(Name
(N
)))
881 and then Comes_From_Source
(Ent
)
884 ("implicit call to & may raise Program_Error?",
885 "info: implicit call to & during elaboration?",
890 ("call to & may raise Program_Error?",
891 "info: call to & during elaboration?",
896 Error_Msg_Qual_Level
:= Nat
'Last;
898 if Nkind
(N
) in N_Subprogram_Instantiation
then
900 ("\missing pragma Elaborate for&?",
901 "\info: implicit pragma Elaborate for& generated?",
905 ("\missing pragma Elaborate_All for&?",
906 "\info: implicit pragma Elaborate_All for & generated?",
909 end Generate_Elab_Warnings
;
911 Error_Msg_Qual_Level
:= 0;
914 -- Set flag to prevent further warnings for same unit unless in
917 if not All_Errors_Mode
and not Dynamic_Elaboration_Checks
then
918 Set_Suppress_Elaboration_Warnings
(W_Scope
, True);
922 -- Check for runtime elaboration check required
924 if Dynamic_Elaboration_Checks
then
925 if not Elaboration_Checks_Suppressed
(Ent
)
926 and then not Elaboration_Checks_Suppressed
(W_Scope
)
927 and then not Elaboration_Checks_Suppressed
(E_Scope
)
928 and then not Cunit_SC
930 -- Runtime elaboration check required. Generate check of the
931 -- elaboration Boolean for the unit containing the entity.
933 -- Note that for this case, we do check the real unit (the one
934 -- from following renamings, since that is the issue!)
936 -- Could this possibly miss a useless but required PE???
938 Insert_Elab_Check
(N
,
939 Make_Attribute_Reference
(Loc
,
940 Attribute_Name
=> Name_Elaborated
,
941 Prefix
=> New_Occurrence_Of
(Spec_Entity
(E_Scope
), Loc
)));
944 -- Case of static elaboration model
947 -- Do not do anything if elaboration checks suppressed. Note that
948 -- we check Ent here, not E, since we want the real entity for the
949 -- body to see if checks are suppressed for it, not the dummy
950 -- entry for renamings or derivations.
952 if Elaboration_Checks_Suppressed
(Ent
)
953 or else Elaboration_Checks_Suppressed
(E_Scope
)
954 or else Elaboration_Checks_Suppressed
(W_Scope
)
958 -- Here we need to generate an implicit elaborate all
961 -- Generate elaborate_all warning unless suppressed
963 if (Elab_Warnings
and Generate_Warnings
and not Inst_Case
)
964 and then not Suppress_Elaboration_Warnings
(Ent
)
965 and then not Suppress_Elaboration_Warnings
(E_Scope
)
966 and then not Suppress_Elaboration_Warnings
(W_Scope
)
968 Error_Msg_Node_2
:= W_Scope
;
970 ("call to& in elaboration code " &
971 "requires pragma Elaborate_All on&?", N
, E
);
974 -- Set indication for binder to generate Elaborate_All
976 Set_Elaboration_Constraint
(N
, E
, W_Scope
);
980 -- Case of entity is in same unit as call or instantiation
982 elsif not Inter_Unit_Only
then
983 Check_Internal_Call
(N
, Ent
, Outer_Scope
, E
);
987 -----------------------------
988 -- Check_Bad_Instantiation --
989 -----------------------------
991 procedure Check_Bad_Instantiation
(N
: Node_Id
) is
995 -- Nothing to do if we do not have an instantiation (happens in some
996 -- error cases, and also in the formal package declaration case)
998 if Nkind
(N
) not in N_Generic_Instantiation
then
1001 -- Nothing to do if serious errors detected (avoid cascaded errors)
1003 elsif Serious_Errors_Detected
/= 0 then
1006 -- Nothing to do if not in full analysis mode
1008 elsif not Full_Analysis
then
1011 -- Nothing to do if inside a generic template
1013 elsif Inside_A_Generic
then
1016 -- Nothing to do if a library level instantiation
1018 elsif Nkind
(Parent
(N
)) = N_Compilation_Unit
then
1021 -- Nothing to do if we are compiling a proper body for semantic
1022 -- purposes only. The generic body may be in another proper body.
1025 Nkind
(Parent
(Unit_Declaration_Node
(Main_Unit_Entity
))) = N_Subunit
1030 Ent
:= Get_Generic_Entity
(N
);
1032 -- The case we are interested in is when the generic spec is in the
1033 -- current declarative part
1035 if not Same_Elaboration_Scope
(Current_Scope
, Scope
(Ent
))
1036 or else not In_Same_Extended_Unit
(N
, Ent
)
1041 -- If the generic entity is within a deeper instance than we are, then
1042 -- either the instantiation to which we refer itself caused an ABE, in
1043 -- which case that will be handled separately. Otherwise, we know that
1044 -- the body we need appears as needed at the point of the instantiation.
1045 -- If they are both at the same level but not within the same instance
1046 -- then the body of the generic will be in the earlier instance.
1049 D1
: constant Int
:= Instantiation_Depth
(Sloc
(Ent
));
1050 D2
: constant Int
:= Instantiation_Depth
(Sloc
(N
));
1057 and then Is_Generic_Instance
(Scope
(Ent
))
1058 and then not In_Open_Scopes
(Scope
(Ent
))
1064 -- Now we can proceed, if the entity being called has a completion,
1065 -- then we are definitely OK, since we have already seen the body.
1067 if Has_Completion
(Ent
) then
1071 -- If there is no body, then nothing to do
1073 if not Has_Generic_Body
(N
) then
1077 -- Here we definitely have a bad instantiation
1080 ("?cannot instantiate& before body seen", N
, Ent
);
1082 if Present
(Instance_Spec
(N
)) then
1083 Supply_Bodies
(Instance_Spec
(N
));
1087 ("\?Program_Error will be raised at run time", N
);
1088 Insert_Elab_Check
(N
);
1089 Set_ABE_Is_Certain
(N
);
1090 end Check_Bad_Instantiation
;
1092 ---------------------
1093 -- Check_Elab_Call --
1094 ---------------------
1096 procedure Check_Elab_Call
1098 Outer_Scope
: Entity_Id
:= Empty
)
1103 function Get_Called_Ent
return Entity_Id
;
1104 -- Retrieve called entity. If this is a call to a protected subprogram,
1105 -- entity is a selected component. The callable entity may be absent,
1106 -- in which case there is no check to perform. This happens with
1107 -- non-analyzed calls in nested generics.
1109 --------------------
1110 -- Get_Called_Ent --
1111 --------------------
1113 function Get_Called_Ent
return Entity_Id
is
1122 elsif Nkind
(Nam
) = N_Selected_Component
then
1123 return Entity
(Selector_Name
(Nam
));
1125 elsif not Is_Entity_Name
(Nam
) then
1129 return Entity
(Nam
);
1133 -- Start of processing for Check_Elab_Call
1136 -- If the call does not come from the main unit, there is nothing to
1137 -- check. Elaboration call from units in the context of the main unit
1138 -- will lead to semantic dependencies when those units are compiled.
1140 if not In_Extended_Main_Code_Unit
(N
) then
1144 -- For an entry call, check relevant restriction
1146 if Nkind
(N
) = N_Entry_Call_Statement
1147 and then not In_Subprogram_Or_Concurrent_Unit
1149 Check_Restriction
(No_Entry_Calls_In_Elaboration_Code
, N
);
1151 -- Nothing to do if this is not a call (happens in some error
1152 -- conditions, and in some cases where rewriting occurs).
1154 elsif Nkind
(N
) /= N_Function_Call
1155 and then Nkind
(N
) /= N_Procedure_Call_Statement
1159 -- Nothing to do if this is a call already rewritten for elab checking
1161 elsif Nkind
(Parent
(N
)) = N_Conditional_Expression
then
1164 -- Nothing to do if inside a generic template
1166 elsif Inside_A_Generic
1167 and then No
(Enclosing_Generic_Body
(N
))
1172 -- Here we have a call at elaboration time which must be checked
1174 if Debug_Flag_LL
then
1175 Write_Str
(" Check_Elab_Call: ");
1178 or else not Is_Entity_Name
(Name
(N
))
1180 Write_Str
("<<not entity name>> ");
1182 Write_Name
(Chars
(Entity
(Name
(N
))));
1185 Write_Str
(" call at ");
1186 Write_Location
(Sloc
(N
));
1190 -- Climb up the tree to make sure we are not inside default expression
1191 -- of a parameter specification or a record component, since in both
1192 -- these cases, we will be doing the actual call later, not now, and it
1193 -- is at the time of the actual call (statically speaking) that we must
1194 -- do our static check, not at the time of its initial analysis).
1196 -- However, we have to check calls within component definitions (e.g.
1197 -- a function call that determines an array component bound), so we
1198 -- terminate the loop in that case.
1201 while Present
(P
) loop
1202 if Nkind
(P
) = N_Parameter_Specification
1204 Nkind
(P
) = N_Component_Declaration
1208 -- The call occurs within the constraint of a component,
1209 -- so it must be checked.
1211 elsif Nkind
(P
) = N_Component_Definition
then
1219 -- Stuff that happens only at the outer level
1221 if No
(Outer_Scope
) then
1222 Elab_Visited
.Set_Last
(0);
1224 -- Nothing to do if current scope is Standard (this is a bit odd, but
1225 -- it happens in the case of generic instantiations).
1227 C_Scope
:= Current_Scope
;
1229 if C_Scope
= Standard_Standard
then
1233 -- First case, we are in elaboration code
1235 From_Elab_Code
:= not In_Subprogram_Or_Concurrent_Unit
;
1236 if From_Elab_Code
then
1238 -- Complain if call that comes from source in preelaborated unit
1239 -- and we are not inside a subprogram (i.e. we are in elab code).
1241 if Comes_From_Source
(N
)
1242 and then In_Preelaborated_Unit
1243 and then not In_Inlined_Body
1245 -- This is a warning in GNAT mode allowing such calls to be
1246 -- used in the predefined library with appropriate care.
1248 Error_Msg_Warn
:= GNAT_Mode
;
1250 ("<non-static call not allowed in preelaborated unit", N
);
1254 -- Second case, we are inside a subprogram or concurrent unit, which
1255 -- means we are not in elaboration code.
1258 -- In this case, the issue is whether we are inside the
1259 -- declarative part of the unit in which we live, or inside its
1260 -- statements. In the latter case, there is no issue of ABE calls
1261 -- at this level (a call from outside to the unit in which we live
1262 -- might cause an ABE, but that will be detected when we analyze
1263 -- that outer level call, as it recurses into the called unit).
1265 -- Climb up the tree, doing this test, and also testing for being
1266 -- inside a default expression, which, as discussed above, is not
1267 -- checked at this stage.
1276 -- If we find a parentless subtree, it seems safe to assume
1277 -- that we are not in a declarative part and that no
1278 -- checking is required.
1284 if Is_List_Member
(P
) then
1285 L
:= List_Containing
(P
);
1292 exit when Nkind
(P
) = N_Subunit
;
1294 -- Filter out case of default expressions, where we do not
1295 -- do the check at this stage.
1297 if Nkind
(P
) = N_Parameter_Specification
1299 Nkind
(P
) = N_Component_Declaration
1304 -- A protected body has no elaboration code and contains
1305 -- only other bodies.
1307 if Nkind
(P
) = N_Protected_Body
then
1310 elsif Nkind
(P
) = N_Subprogram_Body
1312 Nkind
(P
) = N_Task_Body
1314 Nkind
(P
) = N_Block_Statement
1316 Nkind
(P
) = N_Entry_Body
1318 if L
= Declarations
(P
) then
1321 -- We are not in elaboration code, but we are doing
1322 -- dynamic elaboration checks, in this case, we still
1323 -- need to do the call, since the subprogram we are in
1324 -- could be called from another unit, also in dynamic
1325 -- elaboration check mode, at elaboration time.
1327 elsif Dynamic_Elaboration_Checks
then
1329 -- This is a rather new check, going into version
1330 -- 3.14a1 for the first time (V1.80 of this unit), so
1331 -- we provide a debug flag to enable it. That way we
1332 -- have an easy work around for regressions that are
1333 -- caused by this new check. This debug flag can be
1336 if Debug_Flag_DD
then
1340 -- Do the check in this case
1344 elsif Nkind
(P
) = N_Task_Body
then
1346 -- The check is deferred until Check_Task_Activation
1347 -- but we need to capture local suppress pragmas
1348 -- that may inhibit checks on this call.
1350 Ent
:= Get_Called_Ent
;
1355 elsif Elaboration_Checks_Suppressed
(Current_Scope
)
1356 or else Elaboration_Checks_Suppressed
(Ent
)
1357 or else Elaboration_Checks_Suppressed
(Scope
(Ent
))
1359 Set_No_Elaboration_Check
(N
);
1364 -- Static model, call is not in elaboration code, we
1365 -- never need to worry, because in the static model the
1366 -- top level caller always takes care of things.
1377 Ent
:= Get_Called_Ent
;
1383 -- Nothing to do if this is a recursive call (i.e. a call to
1384 -- an entity that is already in the Elab_Call stack)
1386 for J
in 1 .. Elab_Visited
.Last
loop
1387 if Ent
= Elab_Visited
.Table
(J
) then
1392 -- See if we need to analyze this call. We analyze it if either of
1393 -- the following conditions is met:
1395 -- It is an inner level call (since in this case it was triggered
1396 -- by an outer level call from elaboration code), but only if the
1397 -- call is within the scope of the original outer level call.
1399 -- It is an outer level call from elaboration code, or the called
1400 -- entity is in the same elaboration scope.
1402 -- And in these cases, we will check both inter-unit calls and
1403 -- intra-unit (within a single unit) calls.
1405 C_Scope
:= Current_Scope
;
1407 -- If not outer level call, then we follow it if it is within
1408 -- the original scope of the outer call.
1410 if Present
(Outer_Scope
)
1411 and then Within
(Scope
(Ent
), Outer_Scope
)
1414 Check_A_Call
(N
, Ent
, Outer_Scope
, Inter_Unit_Only
=> False);
1416 elsif Elaboration_Checks_Suppressed
(Current_Scope
) then
1419 elsif From_Elab_Code
then
1421 Check_A_Call
(N
, Ent
, Standard_Standard
, Inter_Unit_Only
=> False);
1423 elsif Same_Elaboration_Scope
(C_Scope
, Scope
(Ent
)) then
1425 Check_A_Call
(N
, Ent
, Scope
(Ent
), Inter_Unit_Only
=> False);
1427 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode
1428 -- is set, then we will do the check, but only in the inter-unit case
1429 -- (this is to accommodate unguarded elaboration calls from other units
1430 -- in which this same mode is set). We don't want warnings in this case,
1431 -- it would generate warnings having nothing to do with elaboration.
1433 elsif Dynamic_Elaboration_Checks
then
1439 Inter_Unit_Only
=> True,
1440 Generate_Warnings
=> False);
1442 -- Otherwise nothing to do
1448 -- A call to an Init_Proc in elaboration code may bring additional
1449 -- dependencies, if some of the record components thereof have
1450 -- initializations that are function calls that come from source. We
1451 -- treat the current node as a call to each of these functions, to check
1452 -- their elaboration impact.
1454 if Is_Init_Proc
(Ent
)
1455 and then From_Elab_Code
1457 Process_Init_Proc
: declare
1458 Unit_Decl
: constant Node_Id
:= Unit_Declaration_Node
(Ent
);
1460 function Check_Init_Call
(Nod
: Node_Id
) return Traverse_Result
;
1461 -- Find subprogram calls within body of Init_Proc for Traverse
1462 -- instantiation below.
1464 procedure Traverse_Body
is new Traverse_Proc
(Check_Init_Call
);
1465 -- Traversal procedure to find all calls with body of Init_Proc
1467 ---------------------
1468 -- Check_Init_Call --
1469 ---------------------
1471 function Check_Init_Call
(Nod
: Node_Id
) return Traverse_Result
is
1475 if (Nkind
(Nod
) = N_Function_Call
1476 or else Nkind
(Nod
) = N_Procedure_Call_Statement
)
1477 and then Is_Entity_Name
(Name
(Nod
))
1479 Func
:= Entity
(Name
(Nod
));
1481 if Comes_From_Source
(Func
) then
1483 (N
, Func
, Standard_Standard
, Inter_Unit_Only
=> True);
1491 end Check_Init_Call
;
1493 -- Start of processing for Process_Init_Proc
1496 if Nkind
(Unit_Decl
) = N_Subprogram_Body
then
1497 Traverse_Body
(Handled_Statement_Sequence
(Unit_Decl
));
1499 end Process_Init_Proc
;
1501 end Check_Elab_Call
;
1503 -----------------------
1504 -- Check_Elab_Assign --
1505 -----------------------
1507 procedure Check_Elab_Assign
(N
: Node_Id
) is
1511 Pkg_Spec
: Entity_Id
;
1512 Pkg_Body
: Entity_Id
;
1515 -- For record or array component, check prefix. If it is an access type,
1516 -- then there is nothing to do (we do not know what is being assigned),
1517 -- but otherwise this is an assignment to the prefix.
1519 if Nkind
(N
) = N_Indexed_Component
1521 Nkind
(N
) = N_Selected_Component
1525 if not Is_Access_Type
(Etype
(Prefix
(N
))) then
1526 Check_Elab_Assign
(Prefix
(N
));
1532 -- For type conversion, check expression
1534 if Nkind
(N
) = N_Type_Conversion
then
1535 Check_Elab_Assign
(Expression
(N
));
1539 -- Nothing to do if this is not an entity reference otherwise get entity
1541 if Is_Entity_Name
(N
) then
1547 -- What we are looking for is a reference in the body of a package that
1548 -- modifies a variable declared in the visible part of the package spec.
1551 and then Comes_From_Source
(N
)
1552 and then not Suppress_Elaboration_Warnings
(Ent
)
1553 and then Ekind
(Ent
) = E_Variable
1554 and then not In_Private_Part
(Ent
)
1555 and then Is_Library_Level_Entity
(Ent
)
1557 Scop
:= Current_Scope
;
1559 if No
(Scop
) or else Scop
= Standard_Standard
then
1561 elsif Ekind
(Scop
) = E_Package
1562 and then Is_Compilation_Unit
(Scop
)
1566 Scop
:= Scope
(Scop
);
1570 -- Here Scop points to the containing library package
1573 Pkg_Body
:= Body_Entity
(Pkg_Spec
);
1575 -- All OK if the package has an Elaborate_Body pragma
1577 if Has_Pragma_Elaborate_Body
(Scop
) then
1581 -- OK if entity being modified is not in containing package spec
1583 if not In_Same_Source_Unit
(Scop
, Ent
) then
1587 -- All OK if entity appears in generic package or generic instance.
1588 -- We just get too messed up trying to give proper warnings in the
1589 -- presence of generics. Better no message than a junk one.
1591 Scop
:= Scope
(Ent
);
1592 while Present
(Scop
) and then Scop
/= Pkg_Spec
loop
1593 if Ekind
(Scop
) = E_Generic_Package
then
1595 elsif Ekind
(Scop
) = E_Package
1596 and then Is_Generic_Instance
(Scop
)
1601 Scop
:= Scope
(Scop
);
1604 -- All OK if in task, don't issue warnings there
1606 if In_Task_Activation
then
1610 -- OK if no package body
1612 if No
(Pkg_Body
) then
1616 -- OK if reference is not in package body
1618 if not In_Same_Source_Unit
(Pkg_Body
, N
) then
1622 -- OK if package body has no handled statement sequence
1625 HSS
: constant Node_Id
:=
1626 Handled_Statement_Sequence
(Declaration_Node
(Pkg_Body
));
1628 if No
(HSS
) or else not Comes_From_Source
(HSS
) then
1633 -- We definitely have a case of a modification of an entity in
1634 -- the package spec from the elaboration code of the package body.
1635 -- We may not give the warning (because there are some additional
1636 -- checks to avoid too many false positives), but it would be a good
1637 -- idea for the binder to try to keep the body elaboration close to
1638 -- the spec elaboration.
1640 Set_Elaborate_Body_Desirable
(Pkg_Spec
);
1642 -- All OK in gnat mode (we know what we are doing)
1648 -- All OK if all warnings suppressed
1650 if Warning_Mode
= Suppress
then
1654 -- All OK if elaboration checks suppressed for entity
1656 if Checks_May_Be_Suppressed
(Ent
)
1657 and then Is_Check_Suppressed
(Ent
, Elaboration_Check
)
1662 -- OK if the entity is initialized. Note that the No_Initialization
1663 -- flag usually means that the initialization has been rewritten into
1664 -- assignments, but that still counts for us.
1667 Decl
: constant Node_Id
:= Declaration_Node
(Ent
);
1669 if Nkind
(Decl
) = N_Object_Declaration
1670 and then (Present
(Expression
(Decl
))
1671 or else No_Initialization
(Decl
))
1677 -- Here is where we give the warning
1679 -- All OK if warnings suppressed on the entity
1681 if not Has_Warnings_Off
(Ent
) then
1682 Error_Msg_Sloc
:= Sloc
(Ent
);
1685 ("?elaboration code may access& before it is initialized",
1688 ("\?suggest adding pragma Elaborate_Body to spec of &",
1691 ("\?or an explicit initialization could be added #", N
);
1694 if not All_Errors_Mode
then
1695 Set_Suppress_Elaboration_Warnings
(Ent
);
1698 end Check_Elab_Assign
;
1700 ----------------------
1701 -- Check_Elab_Calls --
1702 ----------------------
1704 procedure Check_Elab_Calls
is
1706 -- If expansion is disabled, do not generate any checks. Also skip
1707 -- checks if any subunits are missing because in either case we lack the
1708 -- full information that we need, and no object file will be created in
1711 if not Expander_Active
1712 or else Is_Generic_Unit
(Cunit_Entity
(Main_Unit
))
1713 or else Subunits_Missing
1718 -- Skip delayed calls if we had any errors
1720 if Serious_Errors_Detected
= 0 then
1721 Delaying_Elab_Checks
:= False;
1722 Expander_Mode_Save_And_Set
(True);
1724 for J
in Delay_Check
.First
.. Delay_Check
.Last
loop
1725 Push_Scope
(Delay_Check
.Table
(J
).Curscop
);
1726 From_Elab_Code
:= Delay_Check
.Table
(J
).From_Elab_Code
;
1728 Check_Internal_Call_Continue
(
1729 N
=> Delay_Check
.Table
(J
).N
,
1730 E
=> Delay_Check
.Table
(J
).E
,
1731 Outer_Scope
=> Delay_Check
.Table
(J
).Outer_Scope
,
1732 Orig_Ent
=> Delay_Check
.Table
(J
).Orig_Ent
);
1737 -- Set Delaying_Elab_Checks back on for next main compilation
1739 Expander_Mode_Restore
;
1740 Delaying_Elab_Checks
:= True;
1742 end Check_Elab_Calls
;
1744 ------------------------------
1745 -- Check_Elab_Instantiation --
1746 ------------------------------
1748 procedure Check_Elab_Instantiation
1750 Outer_Scope
: Entity_Id
:= Empty
)
1755 -- Check for and deal with bad instantiation case. There is some
1756 -- duplicated code here, but we will worry about this later ???
1758 Check_Bad_Instantiation
(N
);
1760 if ABE_Is_Certain
(N
) then
1764 -- Nothing to do if we do not have an instantiation (happens in some
1765 -- error cases, and also in the formal package declaration case)
1767 if Nkind
(N
) not in N_Generic_Instantiation
then
1771 -- Nothing to do if inside a generic template
1773 if Inside_A_Generic
then
1777 -- Nothing to do if the instantiation is not in the main unit
1779 if not In_Extended_Main_Code_Unit
(N
) then
1783 Ent
:= Get_Generic_Entity
(N
);
1784 From_Elab_Code
:= not In_Subprogram_Or_Concurrent_Unit
;
1786 -- See if we need to analyze this instantiation. We analyze it if
1787 -- either of the following conditions is met:
1789 -- It is an inner level instantiation (since in this case it was
1790 -- triggered by an outer level call from elaboration code), but
1791 -- only if the instantiation is within the scope of the original
1792 -- outer level call.
1794 -- It is an outer level instantiation from elaboration code, or the
1795 -- instantiated entity is in the same elaboration scope.
1797 -- And in these cases, we will check both the inter-unit case and
1798 -- the intra-unit (within a single unit) case.
1800 C_Scope
:= Current_Scope
;
1802 if Present
(Outer_Scope
)
1803 and then Within
(Scope
(Ent
), Outer_Scope
)
1806 Check_A_Call
(N
, Ent
, Outer_Scope
, Inter_Unit_Only
=> False);
1808 elsif From_Elab_Code
then
1810 Check_A_Call
(N
, Ent
, Standard_Standard
, Inter_Unit_Only
=> False);
1812 elsif Same_Elaboration_Scope
(C_Scope
, Scope
(Ent
)) then
1814 Check_A_Call
(N
, Ent
, Scope
(Ent
), Inter_Unit_Only
=> False);
1816 -- If none of those cases holds, but Dynamic_Elaboration_Checks mode is
1817 -- set, then we will do the check, but only in the inter-unit case (this
1818 -- is to accommodate unguarded elaboration calls from other units in
1819 -- which this same mode is set). We inhibit warnings in this case, since
1820 -- this instantiation is not occurring in elaboration code.
1822 elsif Dynamic_Elaboration_Checks
then
1828 Inter_Unit_Only
=> True,
1829 Generate_Warnings
=> False);
1834 end Check_Elab_Instantiation
;
1836 -------------------------
1837 -- Check_Internal_Call --
1838 -------------------------
1840 procedure Check_Internal_Call
1843 Outer_Scope
: Entity_Id
;
1844 Orig_Ent
: Entity_Id
)
1846 Inst_Case
: constant Boolean := Nkind
(N
) in N_Generic_Instantiation
;
1849 -- If not function or procedure call or instantiation, then ignore
1850 -- call (this happens in some error case and rewriting cases)
1852 if Nkind
(N
) /= N_Function_Call
1854 Nkind
(N
) /= N_Procedure_Call_Statement
1860 -- Nothing to do if this is a call or instantiation that has
1861 -- already been found to be a sure ABE
1863 elsif ABE_Is_Certain
(N
) then
1866 -- Nothing to do if errors already detected (avoid cascaded errors)
1868 elsif Serious_Errors_Detected
/= 0 then
1871 -- Nothing to do if not in full analysis mode
1873 elsif not Full_Analysis
then
1876 -- Nothing to do if analyzing in special spec-expression mode, since the
1877 -- call is not actually being made at this time.
1879 elsif In_Spec_Expression
then
1882 -- Nothing to do for call to intrinsic subprogram
1884 elsif Is_Intrinsic_Subprogram
(E
) then
1887 -- No need to trace local calls if checking task activation, because
1888 -- other local bodies are elaborated already.
1890 elsif In_Task_Activation
then
1893 -- Nothing to do if call is within a generic unit
1895 elsif Inside_A_Generic
then
1899 -- Delay this call if we are still delaying calls
1901 if Delaying_Elab_Checks
then
1902 Delay_Check
.Append
(
1905 Orig_Ent
=> Orig_Ent
,
1906 Curscop
=> Current_Scope
,
1907 Outer_Scope
=> Outer_Scope
,
1908 From_Elab_Code
=> From_Elab_Code
));
1911 -- Otherwise, call phase 2 continuation right now
1914 Check_Internal_Call_Continue
(N
, E
, Outer_Scope
, Orig_Ent
);
1916 end Check_Internal_Call
;
1918 ----------------------------------
1919 -- Check_Internal_Call_Continue --
1920 ----------------------------------
1922 procedure Check_Internal_Call_Continue
1925 Outer_Scope
: Entity_Id
;
1926 Orig_Ent
: Entity_Id
)
1928 Loc
: constant Source_Ptr
:= Sloc
(N
);
1929 Inst_Case
: constant Boolean := Is_Generic_Unit
(E
);
1934 function Find_Elab_Reference
(N
: Node_Id
) return Traverse_Result
;
1935 -- Function applied to each node as we traverse the body. Checks for
1936 -- call or entity reference that needs checking, and if so checks it.
1937 -- Always returns OK, so entire tree is traversed, except that as
1938 -- described below subprogram bodies are skipped for now.
1940 procedure Traverse
is new Atree
.Traverse_Proc
(Find_Elab_Reference
);
1941 -- Traverse procedure using above Find_Elab_Reference function
1943 -------------------------
1944 -- Find_Elab_Reference --
1945 -------------------------
1947 function Find_Elab_Reference
(N
: Node_Id
) return Traverse_Result
is
1951 -- If user has specified that there are no entry calls in elaboration
1952 -- code, do not trace past an accept statement, because the rendez-
1953 -- vous will happen after elaboration.
1955 if (Nkind
(Original_Node
(N
)) = N_Accept_Statement
1956 or else Nkind
(Original_Node
(N
)) = N_Selective_Accept
)
1957 and then Restriction_Active
(No_Entry_Calls_In_Elaboration_Code
)
1961 -- If we have a function call, check it
1963 elsif Nkind
(N
) = N_Function_Call
then
1964 Check_Elab_Call
(N
, Outer_Scope
);
1967 -- If we have a procedure call, check the call, and also check
1968 -- arguments that are assignments (OUT or IN OUT mode formals).
1970 elsif Nkind
(N
) = N_Procedure_Call_Statement
then
1971 Check_Elab_Call
(N
, Outer_Scope
);
1973 Actual
:= First_Actual
(N
);
1974 while Present
(Actual
) loop
1975 if Known_To_Be_Assigned
(Actual
) then
1976 Check_Elab_Assign
(Actual
);
1979 Next_Actual
(Actual
);
1984 -- If we have a generic instantiation, check it
1986 elsif Nkind
(N
) in N_Generic_Instantiation
then
1987 Check_Elab_Instantiation
(N
, Outer_Scope
);
1990 -- Skip subprogram bodies that come from source (wait for call to
1991 -- analyze these). The reason for the come from source test is to
1992 -- avoid catching task bodies.
1994 -- For task bodies, we should really avoid these too, waiting for the
1995 -- task activation, but that's too much trouble to catch for now, so
1996 -- we go in unconditionally. This is not so terrible, it means the
1997 -- error backtrace is not quite complete, and we are too eager to
1998 -- scan bodies of tasks that are unused, but this is hardly very
2001 elsif Nkind
(N
) = N_Subprogram_Body
2002 and then Comes_From_Source
(N
)
2006 elsif Nkind
(N
) = N_Assignment_Statement
2007 and then Comes_From_Source
(N
)
2009 Check_Elab_Assign
(Name
(N
));
2015 end Find_Elab_Reference
;
2017 -- Start of processing for Check_Internal_Call_Continue
2020 -- Save outer level call if at outer level
2022 if Elab_Call
.Last
= 0 then
2023 Outer_Level_Sloc
:= Loc
;
2026 Elab_Visited
.Append
(E
);
2028 -- If the call is to a function that renames a literal, no check
2031 if Ekind
(E
) = E_Enumeration_Literal
then
2035 Sbody
:= Unit_Declaration_Node
(E
);
2037 if Nkind
(Sbody
) /= N_Subprogram_Body
2039 Nkind
(Sbody
) /= N_Package_Body
2041 Ebody
:= Corresponding_Body
(Sbody
);
2046 Sbody
:= Unit_Declaration_Node
(Ebody
);
2050 -- If the body appears after the outer level call or instantiation then
2051 -- we have an error case handled below.
2053 if Earlier_In_Extended_Unit
(Outer_Level_Sloc
, Sloc
(Sbody
))
2054 and then not In_Task_Activation
2058 -- If we have the instantiation case we are done, since we now
2059 -- know that the body of the generic appeared earlier.
2061 elsif Inst_Case
then
2064 -- Otherwise we have a call, so we trace through the called body to see
2065 -- if it has any problems.
2068 pragma Assert
(Nkind
(Sbody
) = N_Subprogram_Body
);
2070 Elab_Call
.Append
((Cloc
=> Loc
, Ent
=> E
));
2072 if Debug_Flag_LL
then
2073 Write_Str
("Elab_Call.Last = ");
2074 Write_Int
(Int
(Elab_Call
.Last
));
2075 Write_Str
(" Ent = ");
2076 Write_Name
(Chars
(E
));
2078 Write_Location
(Sloc
(N
));
2082 -- Now traverse declarations and statements of subprogram body. Note
2083 -- that we cannot simply Traverse (Sbody), since traverse does not
2084 -- normally visit subprogram bodies.
2089 Decl
:= First
(Declarations
(Sbody
));
2090 while Present
(Decl
) loop
2096 Traverse
(Handled_Statement_Sequence
(Sbody
));
2098 Elab_Call
.Decrement_Last
;
2102 -- Here is the case of calling a subprogram where the body has not yet
2103 -- been encountered, a warning message is needed.
2105 -- If we have nothing in the call stack, then this is at the outer
2106 -- level, and the ABE is bound to occur.
2108 if Elab_Call
.Last
= 0 then
2111 ("?cannot instantiate& before body seen", N
, Orig_Ent
);
2114 ("?cannot call& before body seen", N
, Orig_Ent
);
2118 ("\?Program_Error will be raised at run time", N
);
2119 Insert_Elab_Check
(N
);
2121 -- Call is not at outer level
2124 -- Deal with dynamic elaboration check
2126 if not Elaboration_Checks_Suppressed
(E
) then
2127 Set_Elaboration_Entity_Required
(E
);
2129 -- Case of no elaboration entity allocated yet
2131 if No
(Elaboration_Entity
(E
)) then
2133 -- Create object declaration for elaboration entity, and put it
2134 -- just in front of the spec of the subprogram or generic unit,
2135 -- in the same scope as this unit.
2138 Loce
: constant Source_Ptr
:= Sloc
(E
);
2139 Ent
: constant Entity_Id
:=
2140 Make_Defining_Identifier
(Loc
,
2141 Chars
=> New_External_Name
(Chars
(E
), 'E'));
2144 Set_Elaboration_Entity
(E
, Ent
);
2145 Push_Scope
(Scope
(E
));
2147 Insert_Action
(Declaration_Node
(E
),
2148 Make_Object_Declaration
(Loce
,
2149 Defining_Identifier
=> Ent
,
2150 Object_Definition
=>
2151 New_Occurrence_Of
(Standard_Boolean
, Loce
),
2152 Expression
=> New_Occurrence_Of
(Standard_False
, Loce
)));
2154 -- Set elaboration flag at the point of the body
2156 Set_Elaboration_Flag
(Sbody
, E
);
2158 -- Kill current value indication. This is necessary because
2159 -- the tests of this flag are inserted out of sequence and
2160 -- must not pick up bogus indications of the wrong constant
2161 -- value. Also, this is never a true constant, since one way
2162 -- or another, it gets reset.
2164 Set_Current_Value
(Ent
, Empty
);
2165 Set_Last_Assignment
(Ent
, Empty
);
2166 Set_Is_True_Constant
(Ent
, False);
2171 -- Generate check of the elaboration Boolean
2173 Insert_Elab_Check
(N
,
2174 New_Occurrence_Of
(Elaboration_Entity
(E
), Loc
));
2177 -- Generate the warning
2179 if not Suppress_Elaboration_Warnings
(E
)
2180 and then not Elaboration_Checks_Suppressed
(E
)
2184 ("instantiation of& may occur before body is seen?",
2188 ("call to& may occur before body is seen?", N
, Orig_Ent
);
2192 ("\Program_Error may be raised at run time?", N
);
2198 -- Set flag to suppress further warnings on same subprogram
2199 -- unless in all errors mode
2201 if not All_Errors_Mode
then
2202 Set_Suppress_Elaboration_Warnings
(E
);
2204 end Check_Internal_Call_Continue
;
2206 ---------------------------
2207 -- Check_Task_Activation --
2208 ---------------------------
2210 procedure Check_Task_Activation
(N
: Node_Id
) is
2211 Loc
: constant Source_Ptr
:= Sloc
(N
);
2212 Inter_Procs
: constant Elist_Id
:= New_Elmt_List
;
2213 Intra_Procs
: constant Elist_Id
:= New_Elmt_List
;
2216 Task_Scope
: Entity_Id
;
2217 Cunit_SC
: Boolean := False;
2220 Enclosing
: Entity_Id
;
2222 procedure Add_Task_Proc
(Typ
: Entity_Id
);
2223 -- Add to Task_Procs the task body procedure(s) of task types in Typ.
2224 -- For record types, this procedure recurses over component types.
2226 procedure Collect_Tasks
(Decls
: List_Id
);
2227 -- Collect the types of the tasks that are to be activated in the given
2228 -- list of declarations, in order to perform elaboration checks on the
2229 -- corresponding task procedures which are called implicitly here.
2231 function Outer_Unit
(E
: Entity_Id
) return Entity_Id
;
2232 -- find enclosing compilation unit of Entity, ignoring subunits, or
2233 -- else enclosing subprogram. If E is not a package, there is no need
2234 -- for inter-unit elaboration checks.
2240 procedure Add_Task_Proc
(Typ
: Entity_Id
) is
2242 Proc
: Entity_Id
:= Empty
;
2245 if Is_Task_Type
(Typ
) then
2246 Proc
:= Get_Task_Body_Procedure
(Typ
);
2248 elsif Is_Array_Type
(Typ
)
2249 and then Has_Task
(Base_Type
(Typ
))
2251 Add_Task_Proc
(Component_Type
(Typ
));
2253 elsif Is_Record_Type
(Typ
)
2254 and then Has_Task
(Base_Type
(Typ
))
2256 Comp
:= First_Component
(Typ
);
2257 while Present
(Comp
) loop
2258 Add_Task_Proc
(Etype
(Comp
));
2259 Comp
:= Next_Component
(Comp
);
2263 -- If the task type is another unit, we will perform the usual
2264 -- elaboration check on its enclosing unit. If the type is in the
2265 -- same unit, we can trace the task body as for an internal call,
2266 -- but we only need to examine other external calls, because at
2267 -- the point the task is activated, internal subprogram bodies
2268 -- will have been elaborated already. We keep separate lists for
2269 -- each kind of task.
2271 -- Skip this test if errors have occurred, since in this case
2272 -- we can get false indications.
2274 if Serious_Errors_Detected
/= 0 then
2278 if Present
(Proc
) then
2279 if Outer_Unit
(Scope
(Proc
)) = Enclosing
then
2281 if No
(Corresponding_Body
(Unit_Declaration_Node
(Proc
)))
2283 (not Is_Generic_Instance
(Scope
(Proc
))
2285 Scope
(Proc
) = Scope
(Defining_Identifier
(Decl
)))
2288 ("task will be activated before elaboration of its body?",
2291 ("\Program_Error will be raised at run-time?", Decl
);
2294 Present
(Corresponding_Body
(Unit_Declaration_Node
(Proc
)))
2296 Append_Elmt
(Proc
, Intra_Procs
);
2300 -- No need for multiple entries of the same type
2302 Elmt
:= First_Elmt
(Inter_Procs
);
2303 while Present
(Elmt
) loop
2304 if Node
(Elmt
) = Proc
then
2311 Append_Elmt
(Proc
, Inter_Procs
);
2320 procedure Collect_Tasks
(Decls
: List_Id
) is
2322 if Present
(Decls
) then
2323 Decl
:= First
(Decls
);
2324 while Present
(Decl
) loop
2325 if Nkind
(Decl
) = N_Object_Declaration
2326 and then Has_Task
(Etype
(Defining_Identifier
(Decl
)))
2328 Add_Task_Proc
(Etype
(Defining_Identifier
(Decl
)));
2340 function Outer_Unit
(E
: Entity_Id
) return Entity_Id
is
2345 while Present
(Outer
) loop
2346 if Elaboration_Checks_Suppressed
(Outer
) then
2350 exit when Is_Child_Unit
(Outer
)
2351 or else Scope
(Outer
) = Standard_Standard
2352 or else Ekind
(Outer
) /= E_Package
;
2353 Outer
:= Scope
(Outer
);
2359 -- Start of processing for Check_Task_Activation
2362 Enclosing
:= Outer_Unit
(Current_Scope
);
2364 -- Find all tasks declared in the current unit
2366 if Nkind
(N
) = N_Package_Body
then
2367 P
:= Unit_Declaration_Node
(Corresponding_Spec
(N
));
2369 Collect_Tasks
(Declarations
(N
));
2370 Collect_Tasks
(Visible_Declarations
(Specification
(P
)));
2371 Collect_Tasks
(Private_Declarations
(Specification
(P
)));
2373 elsif Nkind
(N
) = N_Package_Declaration
then
2374 Collect_Tasks
(Visible_Declarations
(Specification
(N
)));
2375 Collect_Tasks
(Private_Declarations
(Specification
(N
)));
2378 Collect_Tasks
(Declarations
(N
));
2381 -- We only perform detailed checks in all tasks are library level
2382 -- entities. If the master is a subprogram or task, activation will
2383 -- depend on the activation of the master itself.
2385 -- Should dynamic checks be added in the more general case???
2387 if Ekind
(Enclosing
) /= E_Package
then
2391 -- For task types defined in other units, we want the unit containing
2392 -- the task body to be elaborated before the current one.
2394 Elmt
:= First_Elmt
(Inter_Procs
);
2395 while Present
(Elmt
) loop
2397 Task_Scope
:= Outer_Unit
(Scope
(Ent
));
2399 if not Is_Compilation_Unit
(Task_Scope
) then
2402 elsif Suppress_Elaboration_Warnings
(Task_Scope
)
2403 or else Elaboration_Checks_Suppressed
(Task_Scope
)
2407 elsif Dynamic_Elaboration_Checks
then
2408 if not Elaboration_Checks_Suppressed
(Ent
)
2409 and then not Cunit_SC
2411 not Restriction_Active
(No_Entry_Calls_In_Elaboration_Code
)
2413 -- Runtime elaboration check required. Generate check of the
2414 -- elaboration Boolean for the unit containing the entity.
2416 Insert_Elab_Check
(N
,
2417 Make_Attribute_Reference
(Loc
,
2418 Attribute_Name
=> Name_Elaborated
,
2420 New_Occurrence_Of
(Spec_Entity
(Task_Scope
), Loc
)));
2424 -- Force the binder to elaborate other unit first
2426 if not Suppress_Elaboration_Warnings
(Ent
)
2427 and then not Elaboration_Checks_Suppressed
(Ent
)
2428 and then Elab_Warnings
2429 and then not Suppress_Elaboration_Warnings
(Task_Scope
)
2430 and then not Elaboration_Checks_Suppressed
(Task_Scope
)
2432 Error_Msg_Node_2
:= Task_Scope
;
2434 ("activation of an instance of task type&" &
2435 " requires pragma Elaborate_All on &?", N
, Ent
);
2438 Activate_Elaborate_All_Desirable
(N
, Task_Scope
);
2439 Set_Suppress_Elaboration_Warnings
(Task_Scope
);
2445 -- For tasks declared in the current unit, trace other calls within
2446 -- the task procedure bodies, which are available.
2448 In_Task_Activation
:= True;
2450 Elmt
:= First_Elmt
(Intra_Procs
);
2451 while Present
(Elmt
) loop
2453 Check_Internal_Call_Continue
(N
, Ent
, Enclosing
, Ent
);
2457 In_Task_Activation
:= False;
2458 end Check_Task_Activation
;
2460 --------------------------------
2461 -- Set_Elaboration_Constraint --
2462 --------------------------------
2464 procedure Set_Elaboration_Constraint
2469 Elab_Unit
: Entity_Id
;
2470 Init_Call
: constant Boolean :=
2471 Chars
(Subp
) = Name_Initialize
2472 and then Comes_From_Source
(Subp
)
2473 and then Present
(Parameter_Associations
(Call
))
2474 and then Is_Controlled
(Etype
(First_Actual
(Call
)));
2476 -- If the unit is mentioned in a with_clause of the current unit, it is
2477 -- visible, and we can set the elaboration flag.
2479 if Is_Immediately_Visible
(Scop
)
2480 or else (Is_Child_Unit
(Scop
) and then Is_Visible_Child_Unit
(Scop
))
2482 Activate_Elaborate_All_Desirable
(Call
, Scop
);
2483 Set_Suppress_Elaboration_Warnings
(Scop
, True);
2487 -- If this is not an initialization call or a call using object notation
2488 -- we know that the unit of the called entity is in the context, and
2489 -- we can set the flag as well. The unit need not be visible if the call
2490 -- occurs within an instantiation.
2492 if Is_Init_Proc
(Subp
)
2494 or else Nkind
(Original_Node
(Call
)) = N_Selected_Component
2496 null; -- detailed processing follows.
2499 Activate_Elaborate_All_Desirable
(Call
, Scop
);
2500 Set_Suppress_Elaboration_Warnings
(Scop
, True);
2504 -- If the unit is not in the context, there must be an intermediate unit
2505 -- that is, on which we need to place to elaboration flag. This happens
2506 -- with init proc calls.
2508 if Is_Init_Proc
(Subp
)
2511 -- The initialization call is on an object whose type is not declared
2512 -- in the same scope as the subprogram. The type of the object must
2513 -- be a subtype of the type of operation. This object is the first
2514 -- actual in the call.
2517 Typ
: constant Entity_Id
:=
2518 Etype
(First
(Parameter_Associations
(Call
)));
2520 Elab_Unit
:= Scope
(Typ
);
2521 while (Present
(Elab_Unit
))
2522 and then not Is_Compilation_Unit
(Elab_Unit
)
2524 Elab_Unit
:= Scope
(Elab_Unit
);
2528 -- If original node uses selected component notation, the prefix is
2529 -- visible and determines the scope that must be elaborated. After
2530 -- rewriting, the prefix is the first actual in the call.
2532 elsif Nkind
(Original_Node
(Call
)) = N_Selected_Component
then
2533 Elab_Unit
:= Scope
(Etype
(First
(Parameter_Associations
(Call
))));
2535 -- Not one of special cases above
2538 -- Using previously computed scope. If the elaboration check is
2539 -- done after analysis, the scope is not visible any longer, but
2540 -- must still be in the context.
2545 Activate_Elaborate_All_Desirable
(Call
, Elab_Unit
);
2546 Set_Suppress_Elaboration_Warnings
(Elab_Unit
, True);
2547 end Set_Elaboration_Constraint
;
2549 ----------------------
2550 -- Has_Generic_Body --
2551 ----------------------
2553 function Has_Generic_Body
(N
: Node_Id
) return Boolean is
2554 Ent
: constant Entity_Id
:= Get_Generic_Entity
(N
);
2555 Decl
: constant Node_Id
:= Unit_Declaration_Node
(Ent
);
2558 function Find_Body_In
(E
: Entity_Id
; N
: Node_Id
) return Node_Id
;
2559 -- Determine if the list of nodes headed by N and linked by Next
2560 -- contains a package body for the package spec entity E, and if so
2561 -- return the package body. If not, then returns Empty.
2563 function Load_Package_Body
(Nam
: Unit_Name_Type
) return Node_Id
;
2564 -- This procedure is called load the unit whose name is given by Nam.
2565 -- This unit is being loaded to see whether it contains an optional
2566 -- generic body. The returned value is the loaded unit, which is always
2567 -- a package body (only package bodies can contain other entities in the
2568 -- sense in which Has_Generic_Body is interested). We only attempt to
2569 -- load bodies if we are generating code. If we are in semantics check
2570 -- only mode, then it would be wrong to load bodies that are not
2571 -- required from a semantic point of view, so in this case we return
2572 -- Empty. The result is that the caller may incorrectly decide that a
2573 -- generic spec does not have a body when in fact it does, but the only
2574 -- harm in this is that some warnings on elaboration problems may be
2575 -- lost in semantic checks only mode, which is not big loss. We also
2576 -- return Empty if we go for a body and it is not there.
2578 function Locate_Corresponding_Body
(PE
: Entity_Id
) return Node_Id
;
2579 -- PE is the entity for a package spec. This function locates the
2580 -- corresponding package body, returning Empty if none is found. The
2581 -- package body returned is fully parsed but may not yet be analyzed,
2582 -- so only syntactic fields should be referenced.
2588 function Find_Body_In
(E
: Entity_Id
; N
: Node_Id
) return Node_Id
is
2593 while Present
(Nod
) loop
2595 -- If we found the package body we are looking for, return it
2597 if Nkind
(Nod
) = N_Package_Body
2598 and then Chars
(Defining_Unit_Name
(Nod
)) = Chars
(E
)
2602 -- If we found the stub for the body, go after the subunit,
2603 -- loading it if necessary.
2605 elsif Nkind
(Nod
) = N_Package_Body_Stub
2606 and then Chars
(Defining_Identifier
(Nod
)) = Chars
(E
)
2608 if Present
(Library_Unit
(Nod
)) then
2609 return Unit
(Library_Unit
(Nod
));
2612 return Load_Package_Body
(Get_Unit_Name
(Nod
));
2615 -- If neither package body nor stub, keep looking on chain
2625 -----------------------
2626 -- Load_Package_Body --
2627 -----------------------
2629 function Load_Package_Body
(Nam
: Unit_Name_Type
) return Node_Id
is
2630 U
: Unit_Number_Type
;
2633 if Operating_Mode
/= Generate_Code
then
2646 return Unit
(Cunit
(U
));
2649 end Load_Package_Body
;
2651 -------------------------------
2652 -- Locate_Corresponding_Body --
2653 -------------------------------
2655 function Locate_Corresponding_Body
(PE
: Entity_Id
) return Node_Id
is
2656 Spec
: constant Node_Id
:= Declaration_Node
(PE
);
2657 Decl
: constant Node_Id
:= Parent
(Spec
);
2658 Scop
: constant Entity_Id
:= Scope
(PE
);
2662 if Is_Library_Level_Entity
(PE
) then
2664 -- If package is a library unit that requires a body, we have no
2665 -- choice but to go after that body because it might contain an
2666 -- optional body for the original generic package.
2668 if Unit_Requires_Body
(PE
) then
2670 -- Load the body. Note that we are a little careful here to use
2671 -- Spec to get the unit number, rather than PE or Decl, since
2672 -- in the case where the package is itself a library level
2673 -- instantiation, Spec will properly reference the generic
2674 -- template, which is what we really want.
2678 (Get_Body_Name
(Unit_Name
(Get_Source_Unit
(Spec
))));
2680 -- But if the package is a library unit that does NOT require
2681 -- a body, then no body is permitted, so we are sure that there
2682 -- is no body for the original generic package.
2688 -- Otherwise look and see if we are embedded in a further package
2690 elsif Is_Package_Or_Generic_Package
(Scop
) then
2692 -- If so, get the body of the enclosing package, and look in
2693 -- its package body for the package body we are looking for.
2695 PBody
:= Locate_Corresponding_Body
(Scop
);
2700 return Find_Body_In
(PE
, First
(Declarations
(PBody
)));
2703 -- If we are not embedded in a further package, then the body
2704 -- must be in the same declarative part as we are.
2707 return Find_Body_In
(PE
, Next
(Decl
));
2709 end Locate_Corresponding_Body
;
2711 -- Start of processing for Has_Generic_Body
2714 if Present
(Corresponding_Body
(Decl
)) then
2717 elsif Unit_Requires_Body
(Ent
) then
2720 -- Compilation units cannot have optional bodies
2722 elsif Is_Compilation_Unit
(Ent
) then
2725 -- Otherwise look at what scope we are in
2728 Scop
:= Scope
(Ent
);
2730 -- Case of entity is in other than a package spec, in this case
2731 -- the body, if present, must be in the same declarative part.
2733 if not Is_Package_Or_Generic_Package
(Scop
) then
2738 -- Declaration node may get us a spec, so if so, go to
2739 -- the parent declaration.
2741 P
:= Declaration_Node
(Ent
);
2742 while not Is_List_Member
(P
) loop
2746 return Present
(Find_Body_In
(Ent
, Next
(P
)));
2749 -- If the entity is in a package spec, then we have to locate
2750 -- the corresponding package body, and look there.
2754 PBody
: constant Node_Id
:= Locate_Corresponding_Body
(Scop
);
2762 (Find_Body_In
(Ent
, (First
(Declarations
(PBody
)))));
2767 end Has_Generic_Body
;
2769 -----------------------
2770 -- Insert_Elab_Check --
2771 -----------------------
2773 procedure Insert_Elab_Check
(N
: Node_Id
; C
: Node_Id
:= Empty
) is
2775 Loc
: constant Source_Ptr
:= Sloc
(N
);
2778 -- If expansion is disabled, do not generate any checks. Also
2779 -- skip checks if any subunits are missing because in either
2780 -- case we lack the full information that we need, and no object
2781 -- file will be created in any case.
2783 if not Expander_Active
or else Subunits_Missing
then
2787 -- If we have a generic instantiation, where Instance_Spec is set,
2788 -- then this field points to a generic instance spec that has
2789 -- been inserted before the instantiation node itself, so that
2790 -- is where we want to insert a check.
2792 if Nkind
(N
) in N_Generic_Instantiation
2793 and then Present
(Instance_Spec
(N
))
2795 Nod
:= Instance_Spec
(N
);
2800 -- If we are inserting at the top level, insert in Aux_Decls
2802 if Nkind
(Parent
(Nod
)) = N_Compilation_Unit
then
2804 ADN
: constant Node_Id
:= Aux_Decls_Node
(Parent
(Nod
));
2810 Make_Raise_Program_Error
(Loc
,
2811 Reason
=> PE_Access_Before_Elaboration
);
2814 Make_Raise_Program_Error
(Loc
,
2815 Condition
=> Make_Op_Not
(Loc
, C
),
2816 Reason
=> PE_Access_Before_Elaboration
);
2819 if No
(Declarations
(ADN
)) then
2820 Set_Declarations
(ADN
, New_List
(R
));
2822 Append_To
(Declarations
(ADN
), R
);
2828 -- Otherwise just insert before the node in question. However, if
2829 -- the context of the call has already been analyzed, an insertion
2830 -- will not work if it depends on subsequent expansion (e.g. a call in
2831 -- a branch of a short-circuit). In that case we replace the call with
2832 -- a conditional expression, or with a Raise if it is unconditional.
2833 -- Unfortunately this does not work if the call has a dynamic size,
2834 -- because gigi regards it as a dynamic-sized temporary. If such a call
2835 -- appears in a short-circuit expression, the elaboration check will be
2836 -- missed (rare enough ???). Otherwise, the code below inserts the check
2837 -- at the appropriate place before the call. Same applies in the even
2838 -- rarer case the return type has a known size but is unconstrained.
2841 if Nkind
(N
) = N_Function_Call
2842 and then Analyzed
(Parent
(N
))
2843 and then Size_Known_At_Compile_Time
(Etype
(N
))
2845 (not Has_Discriminants
(Etype
(N
))
2846 or else Is_Constrained
(Etype
(N
)))
2850 Typ
: constant Entity_Id
:= Etype
(N
);
2851 Chk
: constant Boolean := Do_Range_Check
(N
);
2853 R
: constant Node_Id
:=
2854 Make_Raise_Program_Error
(Loc
,
2855 Reason
=> PE_Access_Before_Elaboration
);
2866 Reloc_N
:= Relocate_Node
(N
);
2867 Save_Interps
(N
, Reloc_N
);
2869 Make_Conditional_Expression
(Loc
,
2870 Expressions
=> New_List
(C
, Reloc_N
, R
)));
2873 Analyze_And_Resolve
(N
, Typ
);
2875 -- If the original call requires a range check, so does the
2876 -- conditional expression.
2879 Enable_Range_Check
(N
);
2881 Set_Do_Range_Check
(N
, False);
2888 Make_Raise_Program_Error
(Loc
,
2889 Reason
=> PE_Access_Before_Elaboration
));
2892 Make_Raise_Program_Error
(Loc
,
2896 Reason
=> PE_Access_Before_Elaboration
));
2900 end Insert_Elab_Check
;
2906 procedure Output_Calls
(N
: Node_Id
) is
2909 function Is_Printable_Error_Name
(Nm
: Name_Id
) return Boolean;
2910 -- An internal function, used to determine if a name, Nm, is either
2911 -- a non-internal name, or is an internal name that is printable
2912 -- by the error message circuits (i.e. it has a single upper
2913 -- case letter at the end).
2915 function Is_Printable_Error_Name
(Nm
: Name_Id
) return Boolean is
2917 if not Is_Internal_Name
(Nm
) then
2920 elsif Name_Len
= 1 then
2924 Name_Len
:= Name_Len
- 1;
2925 return not Is_Internal_Name
;
2927 end Is_Printable_Error_Name
;
2929 -- Start of processing for Output_Calls
2932 for J
in reverse 1 .. Elab_Call
.Last
loop
2933 Error_Msg_Sloc
:= Elab_Call
.Table
(J
).Cloc
;
2935 Ent
:= Elab_Call
.Table
(J
).Ent
;
2937 if Is_Generic_Unit
(Ent
) then
2938 Error_Msg_NE
("\?& instantiated #", N
, Ent
);
2940 elsif Is_Init_Proc
(Ent
) then
2941 Error_Msg_N
("\?initialization procedure called #", N
);
2943 elsif Is_Printable_Error_Name
(Chars
(Ent
)) then
2944 Error_Msg_NE
("\?& called #", N
, Ent
);
2947 Error_Msg_N
("\? called #", N
);
2952 ----------------------------
2953 -- Same_Elaboration_Scope --
2954 ----------------------------
2956 function Same_Elaboration_Scope
(Scop1
, Scop2
: Entity_Id
) return Boolean is
2961 -- Find elaboration scope for Scop1
2962 -- This is either a subprogram or a compilation unit.
2965 while S1
/= Standard_Standard
2966 and then not Is_Compilation_Unit
(S1
)
2967 and then (Ekind
(S1
) = E_Package
2969 Ekind
(S1
) = E_Protected_Type
2971 Ekind
(S1
) = E_Block
)
2976 -- Find elaboration scope for Scop2
2979 while S2
/= Standard_Standard
2980 and then not Is_Compilation_Unit
(S2
)
2981 and then (Ekind
(S2
) = E_Package
2983 Ekind
(S2
) = E_Protected_Type
2985 Ekind
(S2
) = E_Block
)
2991 end Same_Elaboration_Scope
;
2997 procedure Set_C_Scope
is
2999 while not Is_Compilation_Unit
(C_Scope
) loop
3000 C_Scope
:= Scope
(C_Scope
);
3008 function Spec_Entity
(E
: Entity_Id
) return Entity_Id
is
3012 -- Check for case of body entity
3013 -- Why is the check for E_Void needed???
3015 if Ekind_In
(E
, E_Void
, E_Subprogram_Body
, E_Package_Body
) then
3019 Decl
:= Parent
(Decl
);
3020 exit when Nkind
(Decl
) in N_Proper_Body
;
3023 return Corresponding_Spec
(Decl
);
3034 procedure Supply_Bodies
(N
: Node_Id
) is
3036 if Nkind
(N
) = N_Subprogram_Declaration
then
3038 Ent
: constant Entity_Id
:= Defining_Unit_Name
(Specification
(N
));
3041 -- Internal subprograms will already have a generated body, so
3042 -- there is no need to provide a stub for them.
3044 if No
(Corresponding_Body
(N
)) then
3046 Loc
: constant Source_Ptr
:= Sloc
(N
);
3048 Formals
: constant List_Id
:= Copy_Parameter_List
(Ent
);
3049 Nam
: constant Entity_Id
:=
3050 Make_Defining_Identifier
(Loc
, Chars
(Ent
));
3052 Stats
: constant List_Id
:=
3054 (Make_Raise_Program_Error
(Loc
,
3055 Reason
=> PE_Access_Before_Elaboration
));
3058 if Ekind
(Ent
) = E_Function
then
3060 Make_Function_Specification
(Loc
,
3061 Defining_Unit_Name
=> Nam
,
3062 Parameter_Specifications
=> Formals
,
3063 Result_Definition
=>
3065 (Result_Definition
(Specification
(N
))));
3067 -- We cannot reliably make a return statement for this
3068 -- body, but none is needed because the call raises
3071 Set_Return_Present
(Ent
);
3075 Make_Procedure_Specification
(Loc
,
3076 Defining_Unit_Name
=> Nam
,
3077 Parameter_Specifications
=> Formals
);
3080 B
:= Make_Subprogram_Body
(Loc
,
3081 Specification
=> Spec
,
3082 Declarations
=> New_List
,
3083 Handled_Statement_Sequence
=>
3084 Make_Handled_Sequence_Of_Statements
(Loc
, Stats
));
3085 Insert_After
(N
, B
);
3091 elsif Nkind
(N
) = N_Package_Declaration
then
3093 Spec
: constant Node_Id
:= Specification
(N
);
3095 Push_Scope
(Defining_Unit_Name
(Spec
));
3096 Supply_Bodies
(Visible_Declarations
(Spec
));
3097 Supply_Bodies
(Private_Declarations
(Spec
));
3103 procedure Supply_Bodies
(L
: List_Id
) is
3108 while Present
(Elmt
) loop
3109 Supply_Bodies
(Elmt
);
3119 function Within
(E1
, E2
: Entity_Id
) return Boolean is
3126 elsif Scop
= Standard_Standard
then
3129 Scop
:= Scope
(Scop
);
3134 --------------------------
3135 -- Within_Elaborate_All --
3136 --------------------------
3138 function Within_Elaborate_All
(E
: Entity_Id
) return Boolean is
3141 Elab_Id
: Entity_Id
;
3145 Item
:= First
(Context_Items
(Cunit
(Current_Sem_Unit
)));
3146 while Present
(Item
) loop
3147 if Nkind
(Item
) = N_Pragma
3148 and then Pragma_Name
(Item
) = Name_Elaborate_All
3150 -- Return if some previous error on the pragma itself
3152 if Error_Posted
(Item
) then
3158 (Expression
(First
(Pragma_Argument_Associations
(Item
))));
3160 Par
:= Parent
(Unit_Declaration_Node
(Elab_Id
));
3162 Item2
:= First
(Context_Items
(Par
));
3163 while Present
(Item2
) loop
3164 if Nkind
(Item2
) = N_With_Clause
3165 and then Entity
(Name
(Item2
)) = E
3178 end Within_Elaborate_All
;