1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2018, 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 Aspects
; use Aspects
;
27 with Atree
; use Atree
;
28 with Checks
; use Checks
;
29 with Einfo
; use Einfo
;
30 with Errout
; use Errout
;
31 with Exp_Aggr
; use Exp_Aggr
;
32 with Exp_Atag
; use Exp_Atag
;
33 with Exp_Ch4
; use Exp_Ch4
;
34 with Exp_Ch6
; use Exp_Ch6
;
35 with Exp_Ch7
; use Exp_Ch7
;
36 with Exp_Ch9
; use Exp_Ch9
;
37 with Exp_Dbug
; use Exp_Dbug
;
38 with Exp_Disp
; use Exp_Disp
;
39 with Exp_Dist
; use Exp_Dist
;
40 with Exp_Smem
; use Exp_Smem
;
41 with Exp_Strm
; use Exp_Strm
;
42 with Exp_Tss
; use Exp_Tss
;
43 with Exp_Util
; use Exp_Util
;
44 with Freeze
; use Freeze
;
45 with Ghost
; use Ghost
;
47 with Namet
; use Namet
;
48 with Nlists
; use Nlists
;
49 with Nmake
; use Nmake
;
51 with Restrict
; use Restrict
;
52 with Rident
; use Rident
;
53 with Rtsfind
; use Rtsfind
;
55 with Sem_Aux
; use Sem_Aux
;
56 with Sem_Attr
; use Sem_Attr
;
57 with Sem_Cat
; use Sem_Cat
;
58 with Sem_Ch3
; use Sem_Ch3
;
59 with Sem_Ch6
; use Sem_Ch6
;
60 with Sem_Ch8
; use Sem_Ch8
;
61 with Sem_Disp
; use Sem_Disp
;
62 with Sem_Eval
; use Sem_Eval
;
63 with Sem_Mech
; use Sem_Mech
;
64 with Sem_Res
; use Sem_Res
;
65 with Sem_SCIL
; use Sem_SCIL
;
66 with Sem_Type
; use Sem_Type
;
67 with Sem_Util
; use Sem_Util
;
68 with Sinfo
; use Sinfo
;
69 with Stand
; use Stand
;
70 with Snames
; use Snames
;
71 with Tbuild
; use Tbuild
;
72 with Ttypes
; use Ttypes
;
73 with Validsw
; use Validsw
;
75 package body Exp_Ch3
is
77 -----------------------
78 -- Local Subprograms --
79 -----------------------
81 procedure Adjust_Discriminants
(Rtype
: Entity_Id
);
82 -- This is used when freezing a record type. It attempts to construct
83 -- more restrictive subtypes for discriminants so that the max size of
84 -- the record can be calculated more accurately. See the body of this
85 -- procedure for details.
87 procedure Build_Array_Init_Proc
(A_Type
: Entity_Id
; Nod
: Node_Id
);
88 -- Build initialization procedure for given array type. Nod is a node
89 -- used for attachment of any actions required in its construction.
90 -- It also supplies the source location used for the procedure.
92 function Build_Discriminant_Formals
94 Use_Dl
: Boolean) return List_Id
;
95 -- This function uses the discriminants of a type to build a list of
96 -- formal parameters, used in Build_Init_Procedure among other places.
97 -- If the flag Use_Dl is set, the list is built using the already
98 -- defined discriminals of the type, as is the case for concurrent
99 -- types with discriminants. Otherwise new identifiers are created,
100 -- with the source names of the discriminants.
102 function Build_Equivalent_Array_Aggregate
(T
: Entity_Id
) return Node_Id
;
103 -- This function builds a static aggregate that can serve as the initial
104 -- value for an array type whose bounds are static, and whose component
105 -- type is a composite type that has a static equivalent aggregate.
106 -- The equivalent array aggregate is used both for object initialization
107 -- and for component initialization, when used in the following function.
109 function Build_Equivalent_Record_Aggregate
(T
: Entity_Id
) return Node_Id
;
110 -- This function builds a static aggregate that can serve as the initial
111 -- value for a record type whose components are scalar and initialized
112 -- with compile-time values, or arrays with similar initialization or
113 -- defaults. When possible, initialization of an object of the type can
114 -- be achieved by using a copy of the aggregate as an initial value, thus
115 -- removing the implicit call that would otherwise constitute elaboration
118 procedure Build_Record_Init_Proc
(N
: Node_Id
; Rec_Ent
: Entity_Id
);
119 -- Build record initialization procedure. N is the type declaration
120 -- node, and Rec_Ent is the corresponding entity for the record type.
122 procedure Build_Slice_Assignment
(Typ
: Entity_Id
);
123 -- Build assignment procedure for one-dimensional arrays of controlled
124 -- types. Other array and slice assignments are expanded in-line, but
125 -- the code expansion for controlled components (when control actions
126 -- are active) can lead to very large blocks that GCC3 handles poorly.
128 procedure Build_Untagged_Equality
(Typ
: Entity_Id
);
129 -- AI05-0123: Equality on untagged records composes. This procedure
130 -- builds the equality routine for an untagged record that has components
131 -- of a record type that has user-defined primitive equality operations.
132 -- The resulting operation is a TSS subprogram.
134 procedure Check_Stream_Attributes
(Typ
: Entity_Id
);
135 -- Check that if a limited extension has a parent with user-defined stream
136 -- attributes, and does not itself have user-defined stream-attributes,
137 -- then any limited component of the extension also has the corresponding
138 -- user-defined stream attributes.
140 procedure Clean_Task_Names
142 Proc_Id
: Entity_Id
);
143 -- If an initialization procedure includes calls to generate names
144 -- for task subcomponents, indicate that secondary stack cleanup is
145 -- needed after an initialization. Typ is the component type, and Proc_Id
146 -- the initialization procedure for the enclosing composite type.
148 procedure Expand_Freeze_Array_Type
(N
: Node_Id
);
149 -- Freeze an array type. Deals with building the initialization procedure,
150 -- creating the packed array type for a packed array and also with the
151 -- creation of the controlling procedures for the controlled case. The
152 -- argument N is the N_Freeze_Entity node for the type.
154 procedure Expand_Freeze_Class_Wide_Type
(N
: Node_Id
);
155 -- Freeze a class-wide type. Build routine Finalize_Address for the purpose
156 -- of finalizing controlled derivations from the class-wide's root type.
158 procedure Expand_Freeze_Enumeration_Type
(N
: Node_Id
);
159 -- Freeze enumeration type with non-standard representation. Builds the
160 -- array and function needed to convert between enumeration pos and
161 -- enumeration representation values. N is the N_Freeze_Entity node
164 procedure Expand_Freeze_Record_Type
(N
: Node_Id
);
165 -- Freeze record type. Builds all necessary discriminant checking
166 -- and other ancillary functions, and builds dispatch tables where
167 -- needed. The argument N is the N_Freeze_Entity node. This processing
168 -- applies only to E_Record_Type entities, not to class wide types,
169 -- record subtypes, or private types.
171 procedure Expand_Tagged_Root
(T
: Entity_Id
);
172 -- Add a field _Tag at the beginning of the record. This field carries
173 -- the value of the access to the Dispatch table. This procedure is only
174 -- called on root type, the _Tag field being inherited by the descendants.
176 procedure Freeze_Stream_Operations
(N
: Node_Id
; Typ
: Entity_Id
);
177 -- Treat user-defined stream operations as renaming_as_body if the
178 -- subprogram they rename is not frozen when the type is frozen.
180 procedure Initialization_Warning
(E
: Entity_Id
);
181 -- If static elaboration of the package is requested, indicate
182 -- when a type does meet the conditions for static initialization. If
183 -- E is a type, it has components that have no static initialization.
184 -- if E is an entity, its initial expression is not compile-time known.
186 function Init_Formals
(Typ
: Entity_Id
) return List_Id
;
187 -- This function builds the list of formals for an initialization routine.
188 -- The first formal is always _Init with the given type. For task value
189 -- record types and types containing tasks, three additional formals are
192 -- _Master : Master_Id
193 -- _Chain : in out Activation_Chain
194 -- _Task_Name : String
196 -- The caller must append additional entries for discriminants if required.
198 function Inline_Init_Proc
(Typ
: Entity_Id
) return Boolean;
199 -- Returns true if the initialization procedure of Typ should be inlined
201 function In_Runtime
(E
: Entity_Id
) return Boolean;
202 -- Check if E is defined in the RTL (in a child of Ada or System). Used
203 -- to avoid to bring in the overhead of _Input, _Output for tagged types.
205 function Is_User_Defined_Equality
(Prim
: Node_Id
) return Boolean;
206 -- Returns true if Prim is a user defined equality function
208 function Make_Eq_Body
210 Eq_Name
: Name_Id
) return Node_Id
;
211 -- Build the body of a primitive equality operation for a tagged record
212 -- type, or in Ada 2012 for any record type that has components with a
213 -- user-defined equality. Factored out of Predefined_Primitive_Bodies.
215 function Make_Eq_Case
218 Discrs
: Elist_Id
:= New_Elmt_List
) return List_Id
;
219 -- Building block for variant record equality. Defined to share the code
220 -- between the tagged and untagged case. Given a Component_List node CL,
221 -- it generates an 'if' followed by a 'case' statement that compares all
222 -- components of local temporaries named X and Y (that are declared as
223 -- formals at some upper level). E provides the Sloc to be used for the
226 -- IF E is an unchecked_union, Discrs is the list of formals created for
227 -- the inferred discriminants of one operand. These formals are used in
228 -- the generated case statements for each variant of the unchecked union.
232 L
: List_Id
) return Node_Id
;
233 -- Building block for variant record equality. Defined to share the code
234 -- between the tagged and untagged case. Given the list of components
235 -- (or discriminants) L, it generates a return statement that compares all
236 -- components of local temporaries named X and Y (that are declared as
237 -- formals at some upper level). E provides the Sloc to be used for the
240 function Make_Neq_Body
(Tag_Typ
: Entity_Id
) return Node_Id
;
241 -- Search for a renaming of the inequality dispatching primitive of
242 -- this tagged type. If found then build and return the corresponding
243 -- rename-as-body inequality subprogram; otherwise return Empty.
245 procedure Make_Predefined_Primitive_Specs
246 (Tag_Typ
: Entity_Id
;
247 Predef_List
: out List_Id
;
248 Renamed_Eq
: out Entity_Id
);
249 -- Create a list with the specs of the predefined primitive operations.
250 -- For tagged types that are interfaces all these primitives are defined
253 -- The following entries are present for all tagged types, and provide
254 -- the results of the corresponding attribute applied to the object.
255 -- Dispatching is required in general, since the result of the attribute
256 -- will vary with the actual object subtype.
258 -- _size provides result of 'Size attribute
259 -- typSR provides result of 'Read attribute
260 -- typSW provides result of 'Write attribute
261 -- typSI provides result of 'Input attribute
262 -- typSO provides result of 'Output attribute
264 -- The following entries are additionally present for non-limited tagged
265 -- types, and implement additional dispatching operations for predefined
268 -- _equality implements "=" operator
269 -- _assign implements assignment operation
270 -- typDF implements deep finalization
271 -- typDA implements deep adjust
273 -- The latter two are empty procedures unless the type contains some
274 -- controlled components that require finalization actions (the deep
275 -- in the name refers to the fact that the action applies to components).
277 -- The list is returned in Predef_List. The Parameter Renamed_Eq either
278 -- returns the value Empty, or else the defining unit name for the
279 -- predefined equality function in the case where the type has a primitive
280 -- operation that is a renaming of predefined equality (but only if there
281 -- is also an overriding user-defined equality function). The returned
282 -- Renamed_Eq will be passed to the corresponding parameter of
283 -- Predefined_Primitive_Bodies.
285 function Has_New_Non_Standard_Rep
(T
: Entity_Id
) return Boolean;
286 -- Returns True if there are representation clauses for type T that are not
287 -- inherited. If the result is false, the init_proc and the discriminant
288 -- checking functions of the parent can be reused by a derived type.
290 procedure Make_Controlling_Function_Wrappers
291 (Tag_Typ
: Entity_Id
;
292 Decl_List
: out List_Id
;
293 Body_List
: out List_Id
);
294 -- Ada 2005 (AI-391): Makes specs and bodies for the wrapper functions
295 -- associated with inherited functions with controlling results which
296 -- are not overridden. The body of each wrapper function consists solely
297 -- of a return statement whose expression is an extension aggregate
298 -- invoking the inherited subprogram's parent subprogram and extended
299 -- with a null association list.
301 function Make_Null_Procedure_Specs
(Tag_Typ
: Entity_Id
) return List_Id
;
302 -- Ada 2005 (AI-251): Makes specs for null procedures associated with any
303 -- null procedures inherited from an interface type that have not been
304 -- overridden. Only one null procedure will be created for a given set of
305 -- inherited null procedures with homographic profiles.
307 function Predef_Spec_Or_Body
312 Ret_Type
: Entity_Id
:= Empty
;
313 For_Body
: Boolean := False) return Node_Id
;
314 -- This function generates the appropriate expansion for a predefined
315 -- primitive operation specified by its name, parameter profile and
316 -- return type (Empty means this is a procedure). If For_Body is false,
317 -- then the returned node is a subprogram declaration. If For_Body is
318 -- true, then the returned node is a empty subprogram body containing
319 -- no declarations and no statements.
321 function Predef_Stream_Attr_Spec
324 Name
: TSS_Name_Type
;
325 For_Body
: Boolean := False) return Node_Id
;
326 -- Specialized version of Predef_Spec_Or_Body that apply to read, write,
327 -- input and output attribute whose specs are constructed in Exp_Strm.
329 function Predef_Deep_Spec
332 Name
: TSS_Name_Type
;
333 For_Body
: Boolean := False) return Node_Id
;
334 -- Specialized version of Predef_Spec_Or_Body that apply to _deep_adjust
335 -- and _deep_finalize
337 function Predefined_Primitive_Bodies
338 (Tag_Typ
: Entity_Id
;
339 Renamed_Eq
: Entity_Id
) return List_Id
;
340 -- Create the bodies of the predefined primitives that are described in
341 -- Predefined_Primitive_Specs. When not empty, Renamed_Eq must denote
342 -- the defining unit name of the type's predefined equality as returned
343 -- by Make_Predefined_Primitive_Specs.
345 function Predefined_Primitive_Freeze
(Tag_Typ
: Entity_Id
) return List_Id
;
346 -- Freeze entities of all predefined primitive operations. This is needed
347 -- because the bodies of these operations do not normally do any freezing.
349 function Stream_Operation_OK
351 Operation
: TSS_Name_Type
) return Boolean;
352 -- Check whether the named stream operation must be emitted for a given
353 -- type. The rules for inheritance of stream attributes by type extensions
354 -- are enforced by this function. Furthermore, various restrictions prevent
355 -- the generation of these operations, as a useful optimization or for
356 -- certification purposes and to save unnecessary generated code.
358 --------------------------
359 -- Adjust_Discriminants --
360 --------------------------
362 -- This procedure attempts to define subtypes for discriminants that are
363 -- more restrictive than those declared. Such a replacement is possible if
364 -- we can demonstrate that values outside the restricted range would cause
365 -- constraint errors in any case. The advantage of restricting the
366 -- discriminant types in this way is that the maximum size of the variant
367 -- record can be calculated more conservatively.
369 -- An example of a situation in which we can perform this type of
370 -- restriction is the following:
372 -- subtype B is range 1 .. 10;
373 -- type Q is array (B range <>) of Integer;
375 -- type V (N : Natural) is record
379 -- In this situation, we can restrict the upper bound of N to 10, since
380 -- any larger value would cause a constraint error in any case.
382 -- There are many situations in which such restriction is possible, but
383 -- for now, we just look for cases like the above, where the component
384 -- in question is a one dimensional array whose upper bound is one of
385 -- the record discriminants. Also the component must not be part of
386 -- any variant part, since then the component does not always exist.
388 procedure Adjust_Discriminants
(Rtype
: Entity_Id
) is
389 Loc
: constant Source_Ptr
:= Sloc
(Rtype
);
406 Comp
:= First_Component
(Rtype
);
407 while Present
(Comp
) loop
409 -- If our parent is a variant, quit, we do not look at components
410 -- that are in variant parts, because they may not always exist.
412 P
:= Parent
(Comp
); -- component declaration
413 P
:= Parent
(P
); -- component list
415 exit when Nkind
(Parent
(P
)) = N_Variant
;
417 -- We are looking for a one dimensional array type
419 Ctyp
:= Etype
(Comp
);
421 if not Is_Array_Type
(Ctyp
) or else Number_Dimensions
(Ctyp
) > 1 then
425 -- The lower bound must be constant, and the upper bound is a
426 -- discriminant (which is a discriminant of the current record).
428 Ityp
:= Etype
(First_Index
(Ctyp
));
429 Lo
:= Type_Low_Bound
(Ityp
);
430 Hi
:= Type_High_Bound
(Ityp
);
432 if not Compile_Time_Known_Value
(Lo
)
433 or else Nkind
(Hi
) /= N_Identifier
434 or else No
(Entity
(Hi
))
435 or else Ekind
(Entity
(Hi
)) /= E_Discriminant
440 -- We have an array with appropriate bounds
442 Loval
:= Expr_Value
(Lo
);
443 Discr
:= Entity
(Hi
);
444 Dtyp
:= Etype
(Discr
);
446 -- See if the discriminant has a known upper bound
448 Dhi
:= Type_High_Bound
(Dtyp
);
450 if not Compile_Time_Known_Value
(Dhi
) then
454 Dhiv
:= Expr_Value
(Dhi
);
456 -- See if base type of component array has known upper bound
458 Ahi
:= Type_High_Bound
(Etype
(First_Index
(Base_Type
(Ctyp
))));
460 if not Compile_Time_Known_Value
(Ahi
) then
464 Ahiv
:= Expr_Value
(Ahi
);
466 -- The condition for doing the restriction is that the high bound
467 -- of the discriminant is greater than the low bound of the array,
468 -- and is also greater than the high bound of the base type index.
470 if Dhiv
> Loval
and then Dhiv
> Ahiv
then
472 -- We can reset the upper bound of the discriminant type to
473 -- whichever is larger, the low bound of the component, or
474 -- the high bound of the base type array index.
476 -- We build a subtype that is declared as
478 -- subtype Tnn is discr_type range discr_type'First .. max;
480 -- And insert this declaration into the tree. The type of the
481 -- discriminant is then reset to this more restricted subtype.
483 Tnn
:= Make_Temporary
(Loc
, 'T');
485 Insert_Action
(Declaration_Node
(Rtype
),
486 Make_Subtype_Declaration
(Loc
,
487 Defining_Identifier
=> Tnn
,
488 Subtype_Indication
=>
489 Make_Subtype_Indication
(Loc
,
490 Subtype_Mark
=> New_Occurrence_Of
(Dtyp
, Loc
),
492 Make_Range_Constraint
(Loc
,
496 Make_Attribute_Reference
(Loc
,
497 Attribute_Name
=> Name_First
,
498 Prefix
=> New_Occurrence_Of
(Dtyp
, Loc
)),
500 Make_Integer_Literal
(Loc
,
501 Intval
=> UI_Max
(Loval
, Ahiv
)))))));
503 Set_Etype
(Discr
, Tnn
);
507 Next_Component
(Comp
);
509 end Adjust_Discriminants
;
511 ---------------------------
512 -- Build_Array_Init_Proc --
513 ---------------------------
515 procedure Build_Array_Init_Proc
(A_Type
: Entity_Id
; Nod
: Node_Id
) is
516 Comp_Type
: constant Entity_Id
:= Component_Type
(A_Type
);
517 Comp_Simple_Init
: constant Boolean :=
518 Needs_Simple_Initialization
521 not (Validity_Check_Copies
and Is_Bit_Packed_Array
(A_Type
)));
522 -- True if the component needs simple initialization, based on its type,
523 -- plus the fact that we do not do simple initialization for components
524 -- of bit-packed arrays when validity checks are enabled, because the
525 -- initialization with deliberately out-of-range values would raise
528 Body_Stmts
: List_Id
;
529 Has_Default_Init
: Boolean;
530 Index_List
: List_Id
;
534 function Init_Component
return List_Id
;
535 -- Create one statement to initialize one array component, designated
536 -- by a full set of indexes.
538 function Init_One_Dimension
(N
: Int
) return List_Id
;
539 -- Create loop to initialize one dimension of the array. The single
540 -- statement in the loop body initializes the inner dimensions if any,
541 -- or else the single component. Note that this procedure is called
542 -- recursively, with N being the dimension to be initialized. A call
543 -- with N greater than the number of dimensions simply generates the
544 -- component initialization, terminating the recursion.
550 function Init_Component
return List_Id
is
555 Make_Indexed_Component
(Loc
,
556 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
557 Expressions
=> Index_List
);
559 if Has_Default_Aspect
(A_Type
) then
560 Set_Assignment_OK
(Comp
);
562 Make_Assignment_Statement
(Loc
,
565 Convert_To
(Comp_Type
,
566 Default_Aspect_Component_Value
(First_Subtype
(A_Type
)))));
568 elsif Comp_Simple_Init
then
569 Set_Assignment_OK
(Comp
);
571 Make_Assignment_Statement
(Loc
,
577 Size
=> Component_Size
(A_Type
))));
580 Clean_Task_Names
(Comp_Type
, Proc_Id
);
582 Build_Initialization_Call
586 In_Init_Proc
=> True,
587 Enclos_Type
=> A_Type
);
591 ------------------------
592 -- Init_One_Dimension --
593 ------------------------
595 function Init_One_Dimension
(N
: Int
) return List_Id
is
599 -- If the component does not need initializing, then there is nothing
600 -- to do here, so we return a null body. This occurs when generating
601 -- the dummy Init_Proc needed for Initialize_Scalars processing.
603 if not Has_Non_Null_Base_Init_Proc
(Comp_Type
)
604 and then not Comp_Simple_Init
605 and then not Has_Task
(Comp_Type
)
606 and then not Has_Default_Aspect
(A_Type
)
608 return New_List
(Make_Null_Statement
(Loc
));
610 -- If all dimensions dealt with, we simply initialize the component
612 elsif N
> Number_Dimensions
(A_Type
) then
613 return Init_Component
;
615 -- Here we generate the required loop
619 Make_Defining_Identifier
(Loc
, New_External_Name
('J', N
));
621 Append
(New_Occurrence_Of
(Index
, Loc
), Index_List
);
624 Make_Implicit_Loop_Statement
(Nod
,
627 Make_Iteration_Scheme
(Loc
,
628 Loop_Parameter_Specification
=>
629 Make_Loop_Parameter_Specification
(Loc
,
630 Defining_Identifier
=> Index
,
631 Discrete_Subtype_Definition
=>
632 Make_Attribute_Reference
(Loc
,
634 Make_Identifier
(Loc
, Name_uInit
),
635 Attribute_Name
=> Name_Range
,
636 Expressions
=> New_List
(
637 Make_Integer_Literal
(Loc
, N
))))),
638 Statements
=> Init_One_Dimension
(N
+ 1)));
640 end Init_One_Dimension
;
642 -- Start of processing for Build_Array_Init_Proc
645 -- The init proc is created when analyzing the freeze node for the type,
646 -- but it properly belongs with the array type declaration. However, if
647 -- the freeze node is for a subtype of a type declared in another unit
648 -- it seems preferable to use the freeze node as the source location of
649 -- the init proc. In any case this is preferable for gcov usage, and
650 -- the Sloc is not otherwise used by the compiler.
652 if In_Open_Scopes
(Scope
(A_Type
)) then
653 Loc
:= Sloc
(A_Type
);
658 -- Nothing to generate in the following cases:
660 -- 1. Initialization is suppressed for the type
661 -- 2. An initialization already exists for the base type
663 if Initialization_Suppressed
(A_Type
)
664 or else Present
(Base_Init_Proc
(A_Type
))
669 Index_List
:= New_List
;
671 -- We need an initialization procedure if any of the following is true:
673 -- 1. The component type has an initialization procedure
674 -- 2. The component type needs simple initialization
675 -- 3. Tasks are present
676 -- 4. The type is marked as a public entity
677 -- 5. The array type has a Default_Component_Value aspect
679 -- The reason for the public entity test is to deal properly with the
680 -- Initialize_Scalars pragma. This pragma can be set in the client and
681 -- not in the declaring package, this means the client will make a call
682 -- to the initialization procedure (because one of conditions 1-3 must
683 -- apply in this case), and we must generate a procedure (even if it is
684 -- null) to satisfy the call in this case.
686 -- Exception: do not build an array init_proc for a type whose root
687 -- type is Standard.String or Standard.Wide_[Wide_]String, since there
688 -- is no place to put the code, and in any case we handle initialization
689 -- of such types (in the Initialize_Scalars case, that's the only time
690 -- the issue arises) in a special manner anyway which does not need an
693 Has_Default_Init
:= Has_Non_Null_Base_Init_Proc
(Comp_Type
)
694 or else Comp_Simple_Init
695 or else Has_Task
(Comp_Type
)
696 or else Has_Default_Aspect
(A_Type
);
699 or else (not Restriction_Active
(No_Initialize_Scalars
)
700 and then Is_Public
(A_Type
)
701 and then not Is_Standard_String_Type
(A_Type
))
704 Make_Defining_Identifier
(Loc
,
705 Chars
=> Make_Init_Proc_Name
(A_Type
));
707 -- If No_Default_Initialization restriction is active, then we don't
708 -- want to build an init_proc, but we need to mark that an init_proc
709 -- would be needed if this restriction was not active (so that we can
710 -- detect attempts to call it), so set a dummy init_proc in place.
711 -- This is only done though when actual default initialization is
712 -- needed (and not done when only Is_Public is True), since otherwise
713 -- objects such as arrays of scalars could be wrongly flagged as
714 -- violating the restriction.
716 if Restriction_Active
(No_Default_Initialization
) then
717 if Has_Default_Init
then
718 Set_Init_Proc
(A_Type
, Proc_Id
);
724 Body_Stmts
:= Init_One_Dimension
(1);
727 Make_Subprogram_Body
(Loc
,
729 Make_Procedure_Specification
(Loc
,
730 Defining_Unit_Name
=> Proc_Id
,
731 Parameter_Specifications
=> Init_Formals
(A_Type
)),
732 Declarations
=> New_List
,
733 Handled_Statement_Sequence
=>
734 Make_Handled_Sequence_Of_Statements
(Loc
,
735 Statements
=> Body_Stmts
)));
737 Set_Ekind
(Proc_Id
, E_Procedure
);
738 Set_Is_Public
(Proc_Id
, Is_Public
(A_Type
));
739 Set_Is_Internal
(Proc_Id
);
740 Set_Has_Completion
(Proc_Id
);
742 if not Debug_Generated_Code
then
743 Set_Debug_Info_Off
(Proc_Id
);
746 -- Set Inlined on Init_Proc if it is set on the Init_Proc of the
747 -- component type itself (see also Build_Record_Init_Proc).
749 Set_Is_Inlined
(Proc_Id
, Inline_Init_Proc
(Comp_Type
));
751 -- Associate Init_Proc with type, and determine if the procedure
752 -- is null (happens because of the Initialize_Scalars pragma case,
753 -- where we have to generate a null procedure in case it is called
754 -- by a client with Initialize_Scalars set). Such procedures have
755 -- to be generated, but do not have to be called, so we mark them
756 -- as null to suppress the call.
758 Set_Init_Proc
(A_Type
, Proc_Id
);
760 if List_Length
(Body_Stmts
) = 1
762 -- We must skip SCIL nodes because they may have been added to this
763 -- list by Insert_Actions.
765 and then Nkind
(First_Non_SCIL_Node
(Body_Stmts
)) = N_Null_Statement
767 Set_Is_Null_Init_Proc
(Proc_Id
);
770 -- Try to build a static aggregate to statically initialize
771 -- objects of the type. This can only be done for constrained
772 -- one-dimensional arrays with static bounds.
774 Set_Static_Initialization
776 Build_Equivalent_Array_Aggregate
(First_Subtype
(A_Type
)));
779 end Build_Array_Init_Proc
;
781 --------------------------------
782 -- Build_Discr_Checking_Funcs --
783 --------------------------------
785 procedure Build_Discr_Checking_Funcs
(N
: Node_Id
) is
788 Enclosing_Func_Id
: Entity_Id
;
793 function Build_Case_Statement
794 (Case_Id
: Entity_Id
;
795 Variant
: Node_Id
) return Node_Id
;
796 -- Build a case statement containing only two alternatives. The first
797 -- alternative corresponds exactly to the discrete choices given on the
798 -- variant with contains the components that we are generating the
799 -- checks for. If the discriminant is one of these return False. The
800 -- second alternative is an OTHERS choice that will return True
801 -- indicating the discriminant did not match.
803 function Build_Dcheck_Function
804 (Case_Id
: Entity_Id
;
805 Variant
: Node_Id
) return Entity_Id
;
806 -- Build the discriminant checking function for a given variant
808 procedure Build_Dcheck_Functions
(Variant_Part_Node
: Node_Id
);
809 -- Builds the discriminant checking function for each variant of the
810 -- given variant part of the record type.
812 --------------------------
813 -- Build_Case_Statement --
814 --------------------------
816 function Build_Case_Statement
817 (Case_Id
: Entity_Id
;
818 Variant
: Node_Id
) return Node_Id
820 Alt_List
: constant List_Id
:= New_List
;
821 Actuals_List
: List_Id
;
823 Case_Alt_Node
: Node_Id
;
825 Choice_List
: List_Id
;
827 Return_Node
: Node_Id
;
830 Case_Node
:= New_Node
(N_Case_Statement
, Loc
);
832 -- Replace the discriminant which controls the variant with the name
833 -- of the formal of the checking function.
835 Set_Expression
(Case_Node
, Make_Identifier
(Loc
, Chars
(Case_Id
)));
837 Choice
:= First
(Discrete_Choices
(Variant
));
839 if Nkind
(Choice
) = N_Others_Choice
then
840 Choice_List
:= New_Copy_List
(Others_Discrete_Choices
(Choice
));
842 Choice_List
:= New_Copy_List
(Discrete_Choices
(Variant
));
845 if not Is_Empty_List
(Choice_List
) then
846 Case_Alt_Node
:= New_Node
(N_Case_Statement_Alternative
, Loc
);
847 Set_Discrete_Choices
(Case_Alt_Node
, Choice_List
);
849 -- In case this is a nested variant, we need to return the result
850 -- of the discriminant checking function for the immediately
851 -- enclosing variant.
853 if Present
(Enclosing_Func_Id
) then
854 Actuals_List
:= New_List
;
856 D
:= First_Discriminant
(Rec_Id
);
857 while Present
(D
) loop
858 Append
(Make_Identifier
(Loc
, Chars
(D
)), Actuals_List
);
859 Next_Discriminant
(D
);
863 Make_Simple_Return_Statement
(Loc
,
865 Make_Function_Call
(Loc
,
867 New_Occurrence_Of
(Enclosing_Func_Id
, Loc
),
868 Parameter_Associations
=>
873 Make_Simple_Return_Statement
(Loc
,
875 New_Occurrence_Of
(Standard_False
, Loc
));
878 Set_Statements
(Case_Alt_Node
, New_List
(Return_Node
));
879 Append
(Case_Alt_Node
, Alt_List
);
882 Case_Alt_Node
:= New_Node
(N_Case_Statement_Alternative
, Loc
);
883 Choice_List
:= New_List
(New_Node
(N_Others_Choice
, Loc
));
884 Set_Discrete_Choices
(Case_Alt_Node
, Choice_List
);
887 Make_Simple_Return_Statement
(Loc
,
889 New_Occurrence_Of
(Standard_True
, Loc
));
891 Set_Statements
(Case_Alt_Node
, New_List
(Return_Node
));
892 Append
(Case_Alt_Node
, Alt_List
);
894 Set_Alternatives
(Case_Node
, Alt_List
);
896 end Build_Case_Statement
;
898 ---------------------------
899 -- Build_Dcheck_Function --
900 ---------------------------
902 function Build_Dcheck_Function
903 (Case_Id
: Entity_Id
;
904 Variant
: Node_Id
) return Entity_Id
908 Parameter_List
: List_Id
;
912 Body_Node
:= New_Node
(N_Subprogram_Body
, Loc
);
913 Sequence
:= Sequence
+ 1;
916 Make_Defining_Identifier
(Loc
,
917 Chars
=> New_External_Name
(Chars
(Rec_Id
), 'D', Sequence
));
918 Set_Is_Discriminant_Check_Function
(Func_Id
);
920 Spec_Node
:= New_Node
(N_Function_Specification
, Loc
);
921 Set_Defining_Unit_Name
(Spec_Node
, Func_Id
);
923 Parameter_List
:= Build_Discriminant_Formals
(Rec_Id
, False);
925 Set_Parameter_Specifications
(Spec_Node
, Parameter_List
);
926 Set_Result_Definition
(Spec_Node
,
927 New_Occurrence_Of
(Standard_Boolean
, Loc
));
928 Set_Specification
(Body_Node
, Spec_Node
);
929 Set_Declarations
(Body_Node
, New_List
);
931 Set_Handled_Statement_Sequence
(Body_Node
,
932 Make_Handled_Sequence_Of_Statements
(Loc
,
933 Statements
=> New_List
(
934 Build_Case_Statement
(Case_Id
, Variant
))));
936 Set_Ekind
(Func_Id
, E_Function
);
937 Set_Mechanism
(Func_Id
, Default_Mechanism
);
938 Set_Is_Inlined
(Func_Id
, True);
939 Set_Is_Pure
(Func_Id
, True);
940 Set_Is_Public
(Func_Id
, Is_Public
(Rec_Id
));
941 Set_Is_Internal
(Func_Id
, True);
943 if not Debug_Generated_Code
then
944 Set_Debug_Info_Off
(Func_Id
);
949 Append_Freeze_Action
(Rec_Id
, Body_Node
);
950 Set_Dcheck_Function
(Variant
, Func_Id
);
952 end Build_Dcheck_Function
;
954 ----------------------------
955 -- Build_Dcheck_Functions --
956 ----------------------------
958 procedure Build_Dcheck_Functions
(Variant_Part_Node
: Node_Id
) is
959 Component_List_Node
: Node_Id
;
961 Discr_Name
: Entity_Id
;
964 Saved_Enclosing_Func_Id
: Entity_Id
;
967 -- Build the discriminant-checking function for each variant, and
968 -- label all components of that variant with the function's name.
969 -- We only Generate a discriminant-checking function when the
970 -- variant is not empty, to prevent the creation of dead code.
972 Discr_Name
:= Entity
(Name
(Variant_Part_Node
));
973 Variant
:= First_Non_Pragma
(Variants
(Variant_Part_Node
));
975 while Present
(Variant
) loop
976 Component_List_Node
:= Component_List
(Variant
);
978 if not Null_Present
(Component_List_Node
) then
979 Func_Id
:= Build_Dcheck_Function
(Discr_Name
, Variant
);
982 First_Non_Pragma
(Component_Items
(Component_List_Node
));
983 while Present
(Decl
) loop
984 Set_Discriminant_Checking_Func
985 (Defining_Identifier
(Decl
), Func_Id
);
986 Next_Non_Pragma
(Decl
);
989 if Present
(Variant_Part
(Component_List_Node
)) then
990 Saved_Enclosing_Func_Id
:= Enclosing_Func_Id
;
991 Enclosing_Func_Id
:= Func_Id
;
992 Build_Dcheck_Functions
(Variant_Part
(Component_List_Node
));
993 Enclosing_Func_Id
:= Saved_Enclosing_Func_Id
;
997 Next_Non_Pragma
(Variant
);
999 end Build_Dcheck_Functions
;
1001 -- Start of processing for Build_Discr_Checking_Funcs
1004 -- Only build if not done already
1006 if not Discr_Check_Funcs_Built
(N
) then
1007 Type_Def
:= Type_Definition
(N
);
1009 if Nkind
(Type_Def
) = N_Record_Definition
then
1010 if No
(Component_List
(Type_Def
)) then -- null record.
1013 V
:= Variant_Part
(Component_List
(Type_Def
));
1016 else pragma Assert
(Nkind
(Type_Def
) = N_Derived_Type_Definition
);
1017 if No
(Component_List
(Record_Extension_Part
(Type_Def
))) then
1021 (Component_List
(Record_Extension_Part
(Type_Def
)));
1025 Rec_Id
:= Defining_Identifier
(N
);
1027 if Present
(V
) and then not Is_Unchecked_Union
(Rec_Id
) then
1029 Enclosing_Func_Id
:= Empty
;
1030 Build_Dcheck_Functions
(V
);
1033 Set_Discr_Check_Funcs_Built
(N
);
1035 end Build_Discr_Checking_Funcs
;
1037 --------------------------------
1038 -- Build_Discriminant_Formals --
1039 --------------------------------
1041 function Build_Discriminant_Formals
1042 (Rec_Id
: Entity_Id
;
1043 Use_Dl
: Boolean) return List_Id
1045 Loc
: Source_Ptr
:= Sloc
(Rec_Id
);
1046 Parameter_List
: constant List_Id
:= New_List
;
1049 Formal_Type
: Entity_Id
;
1050 Param_Spec_Node
: Node_Id
;
1053 if Has_Discriminants
(Rec_Id
) then
1054 D
:= First_Discriminant
(Rec_Id
);
1055 while Present
(D
) loop
1059 Formal
:= Discriminal
(D
);
1060 Formal_Type
:= Etype
(Formal
);
1062 Formal
:= Make_Defining_Identifier
(Loc
, Chars
(D
));
1063 Formal_Type
:= Etype
(D
);
1067 Make_Parameter_Specification
(Loc
,
1068 Defining_Identifier
=> Formal
,
1070 New_Occurrence_Of
(Formal_Type
, Loc
));
1071 Append
(Param_Spec_Node
, Parameter_List
);
1072 Next_Discriminant
(D
);
1076 return Parameter_List
;
1077 end Build_Discriminant_Formals
;
1079 --------------------------------------
1080 -- Build_Equivalent_Array_Aggregate --
1081 --------------------------------------
1083 function Build_Equivalent_Array_Aggregate
(T
: Entity_Id
) return Node_Id
is
1084 Loc
: constant Source_Ptr
:= Sloc
(T
);
1085 Comp_Type
: constant Entity_Id
:= Component_Type
(T
);
1086 Index_Type
: constant Entity_Id
:= Etype
(First_Index
(T
));
1087 Proc
: constant Entity_Id
:= Base_Init_Proc
(T
);
1093 if not Is_Constrained
(T
)
1094 or else Number_Dimensions
(T
) > 1
1097 Initialization_Warning
(T
);
1101 Lo
:= Type_Low_Bound
(Index_Type
);
1102 Hi
:= Type_High_Bound
(Index_Type
);
1104 if not Compile_Time_Known_Value
(Lo
)
1105 or else not Compile_Time_Known_Value
(Hi
)
1107 Initialization_Warning
(T
);
1111 if Is_Record_Type
(Comp_Type
)
1112 and then Present
(Base_Init_Proc
(Comp_Type
))
1114 Expr
:= Static_Initialization
(Base_Init_Proc
(Comp_Type
));
1117 Initialization_Warning
(T
);
1122 Initialization_Warning
(T
);
1126 Aggr
:= Make_Aggregate
(Loc
, No_List
, New_List
);
1127 Set_Etype
(Aggr
, T
);
1128 Set_Aggregate_Bounds
(Aggr
,
1130 Low_Bound
=> New_Copy
(Lo
),
1131 High_Bound
=> New_Copy
(Hi
)));
1132 Set_Parent
(Aggr
, Parent
(Proc
));
1134 Append_To
(Component_Associations
(Aggr
),
1135 Make_Component_Association
(Loc
,
1139 Low_Bound
=> New_Copy
(Lo
),
1140 High_Bound
=> New_Copy
(Hi
))),
1141 Expression
=> Expr
));
1143 if Static_Array_Aggregate
(Aggr
) then
1146 Initialization_Warning
(T
);
1149 end Build_Equivalent_Array_Aggregate
;
1151 ---------------------------------------
1152 -- Build_Equivalent_Record_Aggregate --
1153 ---------------------------------------
1155 function Build_Equivalent_Record_Aggregate
(T
: Entity_Id
) return Node_Id
is
1158 Comp_Type
: Entity_Id
;
1160 -- Start of processing for Build_Equivalent_Record_Aggregate
1163 if not Is_Record_Type
(T
)
1164 or else Has_Discriminants
(T
)
1165 or else Is_Limited_Type
(T
)
1166 or else Has_Non_Standard_Rep
(T
)
1168 Initialization_Warning
(T
);
1172 Comp
:= First_Component
(T
);
1174 -- A null record needs no warning
1180 while Present
(Comp
) loop
1182 -- Array components are acceptable if initialized by a positional
1183 -- aggregate with static components.
1185 if Is_Array_Type
(Etype
(Comp
)) then
1186 Comp_Type
:= Component_Type
(Etype
(Comp
));
1188 if Nkind
(Parent
(Comp
)) /= N_Component_Declaration
1189 or else No
(Expression
(Parent
(Comp
)))
1190 or else Nkind
(Expression
(Parent
(Comp
))) /= N_Aggregate
1192 Initialization_Warning
(T
);
1195 elsif Is_Scalar_Type
(Component_Type
(Etype
(Comp
)))
1197 (not Compile_Time_Known_Value
(Type_Low_Bound
(Comp_Type
))
1199 not Compile_Time_Known_Value
(Type_High_Bound
(Comp_Type
)))
1201 Initialization_Warning
(T
);
1205 not Static_Array_Aggregate
(Expression
(Parent
(Comp
)))
1207 Initialization_Warning
(T
);
1211 elsif Is_Scalar_Type
(Etype
(Comp
)) then
1212 Comp_Type
:= Etype
(Comp
);
1214 if Nkind
(Parent
(Comp
)) /= N_Component_Declaration
1215 or else No
(Expression
(Parent
(Comp
)))
1216 or else not Compile_Time_Known_Value
(Expression
(Parent
(Comp
)))
1217 or else not Compile_Time_Known_Value
(Type_Low_Bound
(Comp_Type
))
1219 Compile_Time_Known_Value
(Type_High_Bound
(Comp_Type
))
1221 Initialization_Warning
(T
);
1225 -- For now, other types are excluded
1228 Initialization_Warning
(T
);
1232 Next_Component
(Comp
);
1235 -- All components have static initialization. Build positional aggregate
1236 -- from the given expressions or defaults.
1238 Agg
:= Make_Aggregate
(Sloc
(T
), New_List
, New_List
);
1239 Set_Parent
(Agg
, Parent
(T
));
1241 Comp
:= First_Component
(T
);
1242 while Present
(Comp
) loop
1244 (New_Copy_Tree
(Expression
(Parent
(Comp
))), Expressions
(Agg
));
1245 Next_Component
(Comp
);
1248 Analyze_And_Resolve
(Agg
, T
);
1250 end Build_Equivalent_Record_Aggregate
;
1252 -------------------------------
1253 -- Build_Initialization_Call --
1254 -------------------------------
1256 -- References to a discriminant inside the record type declaration can
1257 -- appear either in the subtype_indication to constrain a record or an
1258 -- array, or as part of a larger expression given for the initial value
1259 -- of a component. In both of these cases N appears in the record
1260 -- initialization procedure and needs to be replaced by the formal
1261 -- parameter of the initialization procedure which corresponds to that
1264 -- In the example below, references to discriminants D1 and D2 in proc_1
1265 -- are replaced by references to formals with the same name
1268 -- A similar replacement is done for calls to any record initialization
1269 -- procedure for any components that are themselves of a record type.
1271 -- type R (D1, D2 : Integer) is record
1272 -- X : Integer := F * D1;
1273 -- Y : Integer := F * D2;
1276 -- procedure proc_1 (Out_2 : out R; D1 : Integer; D2 : Integer) is
1280 -- Out_2.X := F * D1;
1281 -- Out_2.Y := F * D2;
1284 function Build_Initialization_Call
1288 In_Init_Proc
: Boolean := False;
1289 Enclos_Type
: Entity_Id
:= Empty
;
1290 Discr_Map
: Elist_Id
:= New_Elmt_List
;
1291 With_Default_Init
: Boolean := False;
1292 Constructor_Ref
: Node_Id
:= Empty
) return List_Id
1294 Res
: constant List_Id
:= New_List
;
1296 Full_Type
: Entity_Id
;
1298 procedure Check_Predicated_Discriminant
1301 -- Discriminants whose subtypes have predicates are checked in two
1303 -- a) When an object is default-initialized and assertions are enabled
1304 -- we check that the value of the discriminant obeys the predicate.
1306 -- b) In all cases, if the discriminant controls a variant and the
1307 -- variant has no others_choice, Constraint_Error must be raised if
1308 -- the predicate is violated, because there is no variant covered
1309 -- by the illegal discriminant value.
1311 -----------------------------------
1312 -- Check_Predicated_Discriminant --
1313 -----------------------------------
1315 procedure Check_Predicated_Discriminant
1319 Typ
: constant Entity_Id
:= Etype
(Discr
);
1321 procedure Check_Missing_Others
(V
: Node_Id
);
1324 --------------------------
1325 -- Check_Missing_Others --
1326 --------------------------
1328 procedure Check_Missing_Others
(V
: Node_Id
) is
1334 Last_Var
:= Last_Non_Pragma
(Variants
(V
));
1335 Choice
:= First
(Discrete_Choices
(Last_Var
));
1337 -- An others_choice is added during expansion for gcc use, but
1338 -- does not cover the illegality.
1340 if Entity
(Name
(V
)) = Discr
then
1342 and then (Nkind
(Choice
) /= N_Others_Choice
1343 or else not Comes_From_Source
(Choice
))
1345 Check_Expression_Against_Static_Predicate
(Val
, Typ
);
1347 if not Is_Static_Expression
(Val
) then
1349 Make_Raise_Constraint_Error
(Loc
,
1352 Right_Opnd
=> Make_Predicate_Call
(Typ
, Val
)),
1353 Reason
=> CE_Invalid_Data
));
1358 -- Check whether some nested variant is ruled by the predicated
1361 Alt
:= First
(Variants
(V
));
1362 while Present
(Alt
) loop
1363 if Nkind
(Alt
) = N_Variant
1364 and then Present
(Variant_Part
(Component_List
(Alt
)))
1366 Check_Missing_Others
1367 (Variant_Part
(Component_List
(Alt
)));
1372 end Check_Missing_Others
;
1378 -- Start of processing for Check_Predicated_Discriminant
1381 if Ekind
(Base_Type
(Full_Type
)) = E_Record_Type
then
1382 Def
:= Type_Definition
(Parent
(Base_Type
(Full_Type
)));
1387 if Policy_In_Effect
(Name_Assert
) = Name_Check
1388 and then not Predicates_Ignored
(Etype
(Discr
))
1390 Prepend_To
(Res
, Make_Predicate_Check
(Typ
, Val
));
1393 -- If discriminant controls a variant, verify that predicate is
1394 -- obeyed or else an Others_Choice is present.
1396 if Nkind
(Def
) = N_Record_Definition
1397 and then Present
(Variant_Part
(Component_List
(Def
)))
1398 and then Policy_In_Effect
(Name_Assert
) = Name_Ignore
1400 Check_Missing_Others
(Variant_Part
(Component_List
(Def
)));
1402 end Check_Predicated_Discriminant
;
1411 First_Arg
: Node_Id
;
1412 Full_Init_Type
: Entity_Id
;
1413 Init_Call
: Node_Id
;
1414 Init_Type
: Entity_Id
;
1417 -- Start of processing for Build_Initialization_Call
1420 pragma Assert
(Constructor_Ref
= Empty
1421 or else Is_CPP_Constructor_Call
(Constructor_Ref
));
1423 if No
(Constructor_Ref
) then
1424 Proc
:= Base_Init_Proc
(Typ
);
1426 Proc
:= Base_Init_Proc
(Typ
, Entity
(Name
(Constructor_Ref
)));
1429 pragma Assert
(Present
(Proc
));
1430 Init_Type
:= Etype
(First_Formal
(Proc
));
1431 Full_Init_Type
:= Underlying_Type
(Init_Type
);
1433 -- Nothing to do if the Init_Proc is null, unless Initialize_Scalars
1434 -- is active (in which case we make the call anyway, since in the
1435 -- actual compiled client it may be non null).
1437 if Is_Null_Init_Proc
(Proc
) and then not Init_Or_Norm_Scalars
then
1440 -- Nothing to do for an array of controlled components that have only
1441 -- the inherited Initialize primitive. This is a useful optimization
1444 elsif Is_Trivial_Subprogram
(Proc
)
1445 and then Is_Array_Type
(Full_Init_Type
)
1447 return New_List
(Make_Null_Statement
(Loc
));
1450 -- Use the [underlying] full view when dealing with a private type. This
1451 -- may require several steps depending on derivations.
1455 if Is_Private_Type
(Full_Type
) then
1456 if Present
(Full_View
(Full_Type
)) then
1457 Full_Type
:= Full_View
(Full_Type
);
1459 elsif Present
(Underlying_Full_View
(Full_Type
)) then
1460 Full_Type
:= Underlying_Full_View
(Full_Type
);
1462 -- When a private type acts as a generic actual and lacks a full
1463 -- view, use the base type.
1465 elsif Is_Generic_Actual_Type
(Full_Type
) then
1466 Full_Type
:= Base_Type
(Full_Type
);
1468 elsif Ekind
(Full_Type
) = E_Private_Subtype
1469 and then (not Has_Discriminants
(Full_Type
)
1470 or else No
(Discriminant_Constraint
(Full_Type
)))
1472 Full_Type
:= Etype
(Full_Type
);
1474 -- The loop has recovered the [underlying] full view, stop the
1481 -- The type is not private, nothing to do
1488 -- If Typ is derived, the procedure is the initialization procedure for
1489 -- the root type. Wrap the argument in an conversion to make it type
1490 -- honest. Actually it isn't quite type honest, because there can be
1491 -- conflicts of views in the private type case. That is why we set
1492 -- Conversion_OK in the conversion node.
1494 if (Is_Record_Type
(Typ
)
1495 or else Is_Array_Type
(Typ
)
1496 or else Is_Private_Type
(Typ
))
1497 and then Init_Type
/= Base_Type
(Typ
)
1499 First_Arg
:= OK_Convert_To
(Etype
(Init_Type
), Id_Ref
);
1500 Set_Etype
(First_Arg
, Init_Type
);
1503 First_Arg
:= Id_Ref
;
1506 Args
:= New_List
(Convert_Concurrent
(First_Arg
, Typ
));
1508 -- In the tasks case, add _Master as the value of the _Master parameter
1509 -- and _Chain as the value of the _Chain parameter. At the outer level,
1510 -- these will be variables holding the corresponding values obtained
1511 -- from GNARL. At inner levels, they will be the parameters passed down
1512 -- through the outer routines.
1514 if Has_Task
(Full_Type
) then
1515 if Restriction_Active
(No_Task_Hierarchy
) then
1517 New_Occurrence_Of
(RTE
(RE_Library_Task_Level
), Loc
));
1519 Append_To
(Args
, Make_Identifier
(Loc
, Name_uMaster
));
1522 -- Add _Chain (not done for sequential elaboration policy, see
1523 -- comment for Create_Restricted_Task_Sequential in s-tarest.ads).
1525 if Partition_Elaboration_Policy
/= 'S' then
1526 Append_To
(Args
, Make_Identifier
(Loc
, Name_uChain
));
1529 -- Ada 2005 (AI-287): In case of default initialized components
1530 -- with tasks, we generate a null string actual parameter.
1531 -- This is just a workaround that must be improved later???
1533 if With_Default_Init
then
1535 Make_String_Literal
(Loc
,
1540 Build_Task_Image_Decls
(Loc
, Id_Ref
, Enclos_Type
, In_Init_Proc
);
1541 Decl
:= Last
(Decls
);
1544 New_Occurrence_Of
(Defining_Identifier
(Decl
), Loc
));
1545 Append_List
(Decls
, Res
);
1553 -- Add discriminant values if discriminants are present
1555 if Has_Discriminants
(Full_Init_Type
) then
1556 Discr
:= First_Discriminant
(Full_Init_Type
);
1557 while Present
(Discr
) loop
1559 -- If this is a discriminated concurrent type, the init_proc
1560 -- for the corresponding record is being called. Use that type
1561 -- directly to find the discriminant value, to handle properly
1562 -- intervening renamed discriminants.
1565 T
: Entity_Id
:= Full_Type
;
1568 if Is_Protected_Type
(T
) then
1569 T
:= Corresponding_Record_Type
(T
);
1573 Get_Discriminant_Value
(
1576 Discriminant_Constraint
(Full_Type
));
1579 -- If the target has access discriminants, and is constrained by
1580 -- an access to the enclosing construct, i.e. a current instance,
1581 -- replace the reference to the type by a reference to the object.
1583 if Nkind
(Arg
) = N_Attribute_Reference
1584 and then Is_Access_Type
(Etype
(Arg
))
1585 and then Is_Entity_Name
(Prefix
(Arg
))
1586 and then Is_Type
(Entity
(Prefix
(Arg
)))
1589 Make_Attribute_Reference
(Loc
,
1590 Prefix
=> New_Copy
(Prefix
(Id_Ref
)),
1591 Attribute_Name
=> Name_Unrestricted_Access
);
1593 elsif In_Init_Proc
then
1595 -- Replace any possible references to the discriminant in the
1596 -- call to the record initialization procedure with references
1597 -- to the appropriate formal parameter.
1599 if Nkind
(Arg
) = N_Identifier
1600 and then Ekind
(Entity
(Arg
)) = E_Discriminant
1602 Arg
:= New_Occurrence_Of
(Discriminal
(Entity
(Arg
)), Loc
);
1604 -- Otherwise make a copy of the default expression. Note that
1605 -- we use the current Sloc for this, because we do not want the
1606 -- call to appear to be at the declaration point. Within the
1607 -- expression, replace discriminants with their discriminals.
1611 New_Copy_Tree
(Arg
, Map
=> Discr_Map
, New_Sloc
=> Loc
);
1615 if Is_Constrained
(Full_Type
) then
1616 Arg
:= Duplicate_Subexpr_No_Checks
(Arg
);
1618 -- The constraints come from the discriminant default exps,
1619 -- they must be reevaluated, so we use New_Copy_Tree but we
1620 -- ensure the proper Sloc (for any embedded calls).
1621 -- In addition, if a predicate check is needed on the value
1622 -- of the discriminant, insert it ahead of the call.
1624 Arg
:= New_Copy_Tree
(Arg
, New_Sloc
=> Loc
);
1627 if Has_Predicates
(Etype
(Discr
)) then
1628 Check_Predicated_Discriminant
(Arg
, Discr
);
1632 -- Ada 2005 (AI-287): In case of default initialized components,
1633 -- if the component is constrained with a discriminant of the
1634 -- enclosing type, we need to generate the corresponding selected
1635 -- component node to access the discriminant value. In other cases
1636 -- this is not required, either because we are inside the init
1637 -- proc and we use the corresponding formal, or else because the
1638 -- component is constrained by an expression.
1640 if With_Default_Init
1641 and then Nkind
(Id_Ref
) = N_Selected_Component
1642 and then Nkind
(Arg
) = N_Identifier
1643 and then Ekind
(Entity
(Arg
)) = E_Discriminant
1646 Make_Selected_Component
(Loc
,
1647 Prefix
=> New_Copy_Tree
(Prefix
(Id_Ref
)),
1648 Selector_Name
=> Arg
));
1650 Append_To
(Args
, Arg
);
1653 Next_Discriminant
(Discr
);
1657 -- If this is a call to initialize the parent component of a derived
1658 -- tagged type, indicate that the tag should not be set in the parent.
1660 if Is_Tagged_Type
(Full_Init_Type
)
1661 and then not Is_CPP_Class
(Full_Init_Type
)
1662 and then Nkind
(Id_Ref
) = N_Selected_Component
1663 and then Chars
(Selector_Name
(Id_Ref
)) = Name_uParent
1665 Append_To
(Args
, New_Occurrence_Of
(Standard_False
, Loc
));
1667 elsif Present
(Constructor_Ref
) then
1668 Append_List_To
(Args
,
1669 New_Copy_List
(Parameter_Associations
(Constructor_Ref
)));
1673 Make_Procedure_Call_Statement
(Loc
,
1674 Name
=> New_Occurrence_Of
(Proc
, Loc
),
1675 Parameter_Associations
=> Args
));
1677 if Needs_Finalization
(Typ
)
1678 and then Nkind
(Id_Ref
) = N_Selected_Component
1680 if Chars
(Selector_Name
(Id_Ref
)) /= Name_uParent
then
1683 (Obj_Ref
=> New_Copy_Tree
(First_Arg
),
1686 -- Guard against a missing [Deep_]Initialize when the type was not
1689 if Present
(Init_Call
) then
1690 Append_To
(Res
, Init_Call
);
1698 when RE_Not_Available
=>
1700 end Build_Initialization_Call
;
1702 ----------------------------
1703 -- Build_Record_Init_Proc --
1704 ----------------------------
1706 procedure Build_Record_Init_Proc
(N
: Node_Id
; Rec_Ent
: Entity_Id
) is
1707 Decls
: constant List_Id
:= New_List
;
1708 Discr_Map
: constant Elist_Id
:= New_Elmt_List
;
1709 Loc
: constant Source_Ptr
:= Sloc
(Rec_Ent
);
1711 Proc_Id
: Entity_Id
;
1712 Rec_Type
: Entity_Id
;
1713 Set_Tag
: Entity_Id
:= Empty
;
1715 function Build_Assignment
1717 Default
: Node_Id
) return List_Id
;
1718 -- Build an assignment statement that assigns the default expression to
1719 -- its corresponding record component if defined. The left-hand side of
1720 -- the assignment is marked Assignment_OK so that initialization of
1721 -- limited private records works correctly. This routine may also build
1722 -- an adjustment call if the component is controlled.
1724 procedure Build_Discriminant_Assignments
(Statement_List
: List_Id
);
1725 -- If the record has discriminants, add assignment statements to
1726 -- Statement_List to initialize the discriminant values from the
1727 -- arguments of the initialization procedure.
1729 function Build_Init_Statements
(Comp_List
: Node_Id
) return List_Id
;
1730 -- Build a list representing a sequence of statements which initialize
1731 -- components of the given component list. This may involve building
1732 -- case statements for the variant parts. Append any locally declared
1733 -- objects on list Decls.
1735 function Build_Init_Call_Thru
(Parameters
: List_Id
) return List_Id
;
1736 -- Given an untagged type-derivation that declares discriminants, e.g.
1738 -- type R (R1, R2 : Integer) is record ... end record;
1739 -- type D (D1 : Integer) is new R (1, D1);
1741 -- we make the _init_proc of D be
1743 -- procedure _init_proc (X : D; D1 : Integer) is
1745 -- _init_proc (R (X), 1, D1);
1748 -- This function builds the call statement in this _init_proc.
1750 procedure Build_CPP_Init_Procedure
;
1751 -- Build the tree corresponding to the procedure specification and body
1752 -- of the IC procedure that initializes the C++ part of the dispatch
1753 -- table of an Ada tagged type that is a derivation of a CPP type.
1754 -- Install it as the CPP_Init TSS.
1756 procedure Build_Init_Procedure
;
1757 -- Build the tree corresponding to the procedure specification and body
1758 -- of the initialization procedure and install it as the _init TSS.
1760 procedure Build_Offset_To_Top_Functions
;
1761 -- Ada 2005 (AI-251): Build the tree corresponding to the procedure spec
1762 -- and body of Offset_To_Top, a function used in conjuction with types
1763 -- having secondary dispatch tables.
1765 procedure Build_Record_Checks
(S
: Node_Id
; Check_List
: List_Id
);
1766 -- Add range checks to components of discriminated records. S is a
1767 -- subtype indication of a record component. Check_List is a list
1768 -- to which the check actions are appended.
1770 function Component_Needs_Simple_Initialization
1771 (T
: Entity_Id
) return Boolean;
1772 -- Determine if a component needs simple initialization, given its type
1773 -- T. This routine is the same as Needs_Simple_Initialization except for
1774 -- components of type Tag and Interface_Tag. These two access types do
1775 -- not require initialization since they are explicitly initialized by
1778 function Parent_Subtype_Renaming_Discrims
return Boolean;
1779 -- Returns True for base types N that rename discriminants, else False
1781 function Requires_Init_Proc
(Rec_Id
: Entity_Id
) return Boolean;
1782 -- Determine whether a record initialization procedure needs to be
1783 -- generated for the given record type.
1785 ----------------------
1786 -- Build_Assignment --
1787 ----------------------
1789 function Build_Assignment
1791 Default
: Node_Id
) return List_Id
1793 Default_Loc
: constant Source_Ptr
:= Sloc
(Default
);
1794 Typ
: constant Entity_Id
:= Underlying_Type
(Etype
(Id
));
1797 Exp
: Node_Id
:= Default
;
1798 Kind
: Node_Kind
:= Nkind
(Default
);
1802 function Replace_Discr_Ref
(N
: Node_Id
) return Traverse_Result
;
1803 -- Analysis of the aggregate has replaced discriminants by their
1804 -- corresponding discriminals, but these are irrelevant when the
1805 -- component has a mutable type and is initialized with an aggregate.
1806 -- Instead, they must be replaced by the values supplied in the
1807 -- aggregate, that will be assigned during the expansion of the
1810 -----------------------
1811 -- Replace_Discr_Ref --
1812 -----------------------
1814 function Replace_Discr_Ref
(N
: Node_Id
) return Traverse_Result
is
1818 if Is_Entity_Name
(N
)
1819 and then Present
(Entity
(N
))
1820 and then Is_Formal
(Entity
(N
))
1821 and then Present
(Discriminal_Link
(Entity
(N
)))
1824 Make_Selected_Component
(Default_Loc
,
1825 Prefix
=> New_Copy_Tree
(Lhs
),
1828 (Discriminal_Link
(Entity
(N
)), Default_Loc
));
1830 if Present
(Val
) then
1831 Rewrite
(N
, New_Copy_Tree
(Val
));
1836 end Replace_Discr_Ref
;
1838 procedure Replace_Discriminant_References
is
1839 new Traverse_Proc
(Replace_Discr_Ref
);
1841 -- Start of processing for Build_Assignment
1845 Make_Selected_Component
(Default_Loc
,
1846 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
1847 Selector_Name
=> New_Occurrence_Of
(Id
, Default_Loc
));
1848 Set_Assignment_OK
(Lhs
);
1850 if Nkind
(Exp
) = N_Aggregate
1851 and then Has_Discriminants
(Typ
)
1852 and then not Is_Constrained
(Base_Type
(Typ
))
1854 -- The aggregate may provide new values for the discriminants
1855 -- of the component, and other components may depend on those
1856 -- discriminants. Previous analysis of those expressions have
1857 -- replaced the discriminants by the formals of the initialization
1858 -- procedure for the type, but these are irrelevant in the
1859 -- enclosing initialization procedure: those discriminant
1860 -- references must be replaced by the values provided in the
1863 Replace_Discriminant_References
(Exp
);
1866 -- Case of an access attribute applied to the current instance.
1867 -- Replace the reference to the type by a reference to the actual
1868 -- object. (Note that this handles the case of the top level of
1869 -- the expression being given by such an attribute, but does not
1870 -- cover uses nested within an initial value expression. Nested
1871 -- uses are unlikely to occur in practice, but are theoretically
1872 -- possible.) It is not clear how to handle them without fully
1873 -- traversing the expression. ???
1875 if Kind
= N_Attribute_Reference
1876 and then Nam_In
(Attribute_Name
(Default
), Name_Unchecked_Access
,
1877 Name_Unrestricted_Access
)
1878 and then Is_Entity_Name
(Prefix
(Default
))
1879 and then Is_Type
(Entity
(Prefix
(Default
)))
1880 and then Entity
(Prefix
(Default
)) = Rec_Type
1883 Make_Attribute_Reference
(Default_Loc
,
1885 Make_Identifier
(Default_Loc
, Name_uInit
),
1886 Attribute_Name
=> Name_Unrestricted_Access
);
1889 -- Take a copy of Exp to ensure that later copies of this component
1890 -- declaration in derived types see the original tree, not a node
1891 -- rewritten during expansion of the init_proc. If the copy contains
1892 -- itypes, the scope of the new itypes is the init_proc being built.
1894 Exp
:= New_Copy_Tree
(Exp
, New_Scope
=> Proc_Id
);
1897 Make_Assignment_Statement
(Loc
,
1899 Expression
=> Exp
));
1901 Set_No_Ctrl_Actions
(First
(Res
));
1903 -- Adjust the tag if tagged (because of possible view conversions).
1904 -- Suppress the tag adjustment when not Tagged_Type_Expansion because
1905 -- tags are represented implicitly in objects.
1907 if Is_Tagged_Type
(Typ
) and then Tagged_Type_Expansion
then
1909 Make_Assignment_Statement
(Default_Loc
,
1911 Make_Selected_Component
(Default_Loc
,
1913 New_Copy_Tree
(Lhs
, New_Scope
=> Proc_Id
),
1916 (First_Tag_Component
(Typ
), Default_Loc
)),
1919 Unchecked_Convert_To
(RTE
(RE_Tag
),
1921 (Node
(First_Elmt
(Access_Disp_Table
(Underlying_Type
1926 -- Adjust the component if controlled except if it is an aggregate
1927 -- that will be expanded inline.
1929 if Kind
= N_Qualified_Expression
then
1930 Kind
:= Nkind
(Expression
(Default
));
1933 if Needs_Finalization
(Typ
)
1934 and then not (Nkind_In
(Kind
, N_Aggregate
, N_Extension_Aggregate
))
1935 and then not Is_Build_In_Place_Function_Call
(Exp
)
1939 (Obj_Ref
=> New_Copy_Tree
(Lhs
),
1942 -- Guard against a missing [Deep_]Adjust when the component type
1943 -- was not properly frozen.
1945 if Present
(Adj_Call
) then
1946 Append_To
(Res
, Adj_Call
);
1950 -- If a component type has a predicate, add check to the component
1951 -- assignment. Discriminants are handled at the point of the call,
1952 -- which provides for a better error message.
1954 if Comes_From_Source
(Exp
)
1955 and then Has_Predicates
(Typ
)
1956 and then not Predicate_Checks_Suppressed
(Empty
)
1957 and then not Predicates_Ignored
(Typ
)
1959 Append
(Make_Predicate_Check
(Typ
, Exp
), Res
);
1965 when RE_Not_Available
=>
1967 end Build_Assignment
;
1969 ------------------------------------
1970 -- Build_Discriminant_Assignments --
1971 ------------------------------------
1973 procedure Build_Discriminant_Assignments
(Statement_List
: List_Id
) is
1974 Is_Tagged
: constant Boolean := Is_Tagged_Type
(Rec_Type
);
1979 if Has_Discriminants
(Rec_Type
)
1980 and then not Is_Unchecked_Union
(Rec_Type
)
1982 D
:= First_Discriminant
(Rec_Type
);
1983 while Present
(D
) loop
1985 -- Don't generate the assignment for discriminants in derived
1986 -- tagged types if the discriminant is a renaming of some
1987 -- ancestor discriminant. This initialization will be done
1988 -- when initializing the _parent field of the derived record.
1991 and then Present
(Corresponding_Discriminant
(D
))
1997 Append_List_To
(Statement_List
,
1998 Build_Assignment
(D
,
1999 New_Occurrence_Of
(Discriminal
(D
), D_Loc
)));
2002 Next_Discriminant
(D
);
2005 end Build_Discriminant_Assignments
;
2007 --------------------------
2008 -- Build_Init_Call_Thru --
2009 --------------------------
2011 function Build_Init_Call_Thru
(Parameters
: List_Id
) return List_Id
is
2012 Parent_Proc
: constant Entity_Id
:=
2013 Base_Init_Proc
(Etype
(Rec_Type
));
2015 Parent_Type
: constant Entity_Id
:=
2016 Etype
(First_Formal
(Parent_Proc
));
2018 Uparent_Type
: constant Entity_Id
:=
2019 Underlying_Type
(Parent_Type
);
2021 First_Discr_Param
: Node_Id
;
2025 First_Arg
: Node_Id
;
2026 Parent_Discr
: Entity_Id
;
2030 -- First argument (_Init) is the object to be initialized.
2031 -- ??? not sure where to get a reasonable Loc for First_Arg
2034 OK_Convert_To
(Parent_Type
,
2036 (Defining_Identifier
(First
(Parameters
)), Loc
));
2038 Set_Etype
(First_Arg
, Parent_Type
);
2040 Args
:= New_List
(Convert_Concurrent
(First_Arg
, Rec_Type
));
2042 -- In the tasks case,
2043 -- add _Master as the value of the _Master parameter
2044 -- add _Chain as the value of the _Chain parameter.
2045 -- add _Task_Name as the value of the _Task_Name parameter.
2046 -- At the outer level, these will be variables holding the
2047 -- corresponding values obtained from GNARL or the expander.
2049 -- At inner levels, they will be the parameters passed down through
2050 -- the outer routines.
2052 First_Discr_Param
:= Next
(First
(Parameters
));
2054 if Has_Task
(Rec_Type
) then
2055 if Restriction_Active
(No_Task_Hierarchy
) then
2057 New_Occurrence_Of
(RTE
(RE_Library_Task_Level
), Loc
));
2059 Append_To
(Args
, Make_Identifier
(Loc
, Name_uMaster
));
2062 -- Add _Chain (not done for sequential elaboration policy, see
2063 -- comment for Create_Restricted_Task_Sequential in s-tarest.ads).
2065 if Partition_Elaboration_Policy
/= 'S' then
2066 Append_To
(Args
, Make_Identifier
(Loc
, Name_uChain
));
2069 Append_To
(Args
, Make_Identifier
(Loc
, Name_uTask_Name
));
2070 First_Discr_Param
:= Next
(Next
(Next
(First_Discr_Param
)));
2073 -- Append discriminant values
2075 if Has_Discriminants
(Uparent_Type
) then
2076 pragma Assert
(not Is_Tagged_Type
(Uparent_Type
));
2078 Parent_Discr
:= First_Discriminant
(Uparent_Type
);
2079 while Present
(Parent_Discr
) loop
2081 -- Get the initial value for this discriminant
2082 -- ??? needs to be cleaned up to use parent_Discr_Constr
2086 Discr
: Entity_Id
:=
2087 First_Stored_Discriminant
(Uparent_Type
);
2089 Discr_Value
: Elmt_Id
:=
2090 First_Elmt
(Stored_Constraint
(Rec_Type
));
2093 while Original_Record_Component
(Parent_Discr
) /= Discr
loop
2094 Next_Stored_Discriminant
(Discr
);
2095 Next_Elmt
(Discr_Value
);
2098 Arg
:= Node
(Discr_Value
);
2101 -- Append it to the list
2103 if Nkind
(Arg
) = N_Identifier
2104 and then Ekind
(Entity
(Arg
)) = E_Discriminant
2107 New_Occurrence_Of
(Discriminal
(Entity
(Arg
)), Loc
));
2109 -- Case of access discriminants. We replace the reference
2110 -- to the type by a reference to the actual object.
2112 -- Is above comment right??? Use of New_Copy below seems mighty
2116 Append_To
(Args
, New_Copy
(Arg
));
2119 Next_Discriminant
(Parent_Discr
);
2125 Make_Procedure_Call_Statement
(Loc
,
2127 New_Occurrence_Of
(Parent_Proc
, Loc
),
2128 Parameter_Associations
=> Args
));
2131 end Build_Init_Call_Thru
;
2133 -----------------------------------
2134 -- Build_Offset_To_Top_Functions --
2135 -----------------------------------
2137 procedure Build_Offset_To_Top_Functions
is
2139 procedure Build_Offset_To_Top_Function
(Iface_Comp
: Entity_Id
);
2141 -- function Fxx (O : Address) return Storage_Offset is
2142 -- type Acc is access all <Typ>;
2144 -- return Acc!(O).Iface_Comp'Position;
2147 ----------------------------------
2148 -- Build_Offset_To_Top_Function --
2149 ----------------------------------
2151 procedure Build_Offset_To_Top_Function
(Iface_Comp
: Entity_Id
) is
2152 Body_Node
: Node_Id
;
2153 Func_Id
: Entity_Id
;
2154 Spec_Node
: Node_Id
;
2155 Acc_Type
: Entity_Id
;
2158 Func_Id
:= Make_Temporary
(Loc
, 'F');
2159 Set_DT_Offset_To_Top_Func
(Iface_Comp
, Func_Id
);
2162 -- function Fxx (O : in Rec_Typ) return Storage_Offset;
2164 Spec_Node
:= New_Node
(N_Function_Specification
, Loc
);
2165 Set_Defining_Unit_Name
(Spec_Node
, Func_Id
);
2166 Set_Parameter_Specifications
(Spec_Node
, New_List
(
2167 Make_Parameter_Specification
(Loc
,
2168 Defining_Identifier
=>
2169 Make_Defining_Identifier
(Loc
, Name_uO
),
2172 New_Occurrence_Of
(RTE
(RE_Address
), Loc
))));
2173 Set_Result_Definition
(Spec_Node
,
2174 New_Occurrence_Of
(RTE
(RE_Storage_Offset
), Loc
));
2177 -- function Fxx (O : in Rec_Typ) return Storage_Offset is
2179 -- return -O.Iface_Comp'Position;
2182 Body_Node
:= New_Node
(N_Subprogram_Body
, Loc
);
2183 Set_Specification
(Body_Node
, Spec_Node
);
2185 Acc_Type
:= Make_Temporary
(Loc
, 'T');
2186 Set_Declarations
(Body_Node
, New_List
(
2187 Make_Full_Type_Declaration
(Loc
,
2188 Defining_Identifier
=> Acc_Type
,
2190 Make_Access_To_Object_Definition
(Loc
,
2191 All_Present
=> True,
2192 Null_Exclusion_Present
=> False,
2193 Constant_Present
=> False,
2194 Subtype_Indication
=>
2195 New_Occurrence_Of
(Rec_Type
, Loc
)))));
2197 Set_Handled_Statement_Sequence
(Body_Node
,
2198 Make_Handled_Sequence_Of_Statements
(Loc
,
2199 Statements
=> New_List
(
2200 Make_Simple_Return_Statement
(Loc
,
2203 Make_Attribute_Reference
(Loc
,
2205 Make_Selected_Component
(Loc
,
2207 Unchecked_Convert_To
(Acc_Type
,
2208 Make_Identifier
(Loc
, Name_uO
)),
2210 New_Occurrence_Of
(Iface_Comp
, Loc
)),
2211 Attribute_Name
=> Name_Position
))))));
2213 Set_Ekind
(Func_Id
, E_Function
);
2214 Set_Mechanism
(Func_Id
, Default_Mechanism
);
2215 Set_Is_Internal
(Func_Id
, True);
2217 if not Debug_Generated_Code
then
2218 Set_Debug_Info_Off
(Func_Id
);
2221 Analyze
(Body_Node
);
2223 Append_Freeze_Action
(Rec_Type
, Body_Node
);
2224 end Build_Offset_To_Top_Function
;
2228 Iface_Comp
: Node_Id
;
2229 Iface_Comp_Elmt
: Elmt_Id
;
2230 Ifaces_Comp_List
: Elist_Id
;
2232 -- Start of processing for Build_Offset_To_Top_Functions
2235 -- Offset_To_Top_Functions are built only for derivations of types
2236 -- with discriminants that cover interface types.
2237 -- Nothing is needed either in case of virtual targets, since
2238 -- interfaces are handled directly by the target.
2240 if not Is_Tagged_Type
(Rec_Type
)
2241 or else Etype
(Rec_Type
) = Rec_Type
2242 or else not Has_Discriminants
(Etype
(Rec_Type
))
2243 or else not Tagged_Type_Expansion
2248 Collect_Interface_Components
(Rec_Type
, Ifaces_Comp_List
);
2250 -- For each interface type with secondary dispatch table we generate
2251 -- the Offset_To_Top_Functions (required to displace the pointer in
2252 -- interface conversions)
2254 Iface_Comp_Elmt
:= First_Elmt
(Ifaces_Comp_List
);
2255 while Present
(Iface_Comp_Elmt
) loop
2256 Iface_Comp
:= Node
(Iface_Comp_Elmt
);
2257 pragma Assert
(Is_Interface
(Related_Type
(Iface_Comp
)));
2259 -- If the interface is a parent of Rec_Type it shares the primary
2260 -- dispatch table and hence there is no need to build the function
2262 if not Is_Ancestor
(Related_Type
(Iface_Comp
), Rec_Type
,
2263 Use_Full_View
=> True)
2265 Build_Offset_To_Top_Function
(Iface_Comp
);
2268 Next_Elmt
(Iface_Comp_Elmt
);
2270 end Build_Offset_To_Top_Functions
;
2272 ------------------------------
2273 -- Build_CPP_Init_Procedure --
2274 ------------------------------
2276 procedure Build_CPP_Init_Procedure
is
2277 Body_Node
: Node_Id
;
2278 Body_Stmts
: List_Id
;
2279 Flag_Id
: Entity_Id
;
2280 Handled_Stmt_Node
: Node_Id
;
2281 Init_Tags_List
: List_Id
;
2282 Proc_Id
: Entity_Id
;
2283 Proc_Spec_Node
: Node_Id
;
2286 -- Check cases requiring no IC routine
2288 if not Is_CPP_Class
(Root_Type
(Rec_Type
))
2289 or else Is_CPP_Class
(Rec_Type
)
2290 or else CPP_Num_Prims
(Rec_Type
) = 0
2291 or else not Tagged_Type_Expansion
2292 or else No_Run_Time_Mode
2299 -- Flag : Boolean := False;
2301 -- procedure Typ_IC is
2304 -- Copy C++ dispatch table slots from parent
2305 -- Update C++ slots of overridden primitives
2309 Flag_Id
:= Make_Temporary
(Loc
, 'F');
2311 Append_Freeze_Action
(Rec_Type
,
2312 Make_Object_Declaration
(Loc
,
2313 Defining_Identifier
=> Flag_Id
,
2314 Object_Definition
=>
2315 New_Occurrence_Of
(Standard_Boolean
, Loc
),
2317 New_Occurrence_Of
(Standard_True
, Loc
)));
2319 Body_Stmts
:= New_List
;
2320 Body_Node
:= New_Node
(N_Subprogram_Body
, Loc
);
2322 Proc_Spec_Node
:= New_Node
(N_Procedure_Specification
, Loc
);
2325 Make_Defining_Identifier
(Loc
,
2326 Chars
=> Make_TSS_Name
(Rec_Type
, TSS_CPP_Init_Proc
));
2328 Set_Ekind
(Proc_Id
, E_Procedure
);
2329 Set_Is_Internal
(Proc_Id
);
2331 Set_Defining_Unit_Name
(Proc_Spec_Node
, Proc_Id
);
2333 Set_Parameter_Specifications
(Proc_Spec_Node
, New_List
);
2334 Set_Specification
(Body_Node
, Proc_Spec_Node
);
2335 Set_Declarations
(Body_Node
, New_List
);
2337 Init_Tags_List
:= Build_Inherit_CPP_Prims
(Rec_Type
);
2339 Append_To
(Init_Tags_List
,
2340 Make_Assignment_Statement
(Loc
,
2342 New_Occurrence_Of
(Flag_Id
, Loc
),
2344 New_Occurrence_Of
(Standard_False
, Loc
)));
2346 Append_To
(Body_Stmts
,
2347 Make_If_Statement
(Loc
,
2348 Condition
=> New_Occurrence_Of
(Flag_Id
, Loc
),
2349 Then_Statements
=> Init_Tags_List
));
2351 Handled_Stmt_Node
:=
2352 New_Node
(N_Handled_Sequence_Of_Statements
, Loc
);
2353 Set_Statements
(Handled_Stmt_Node
, Body_Stmts
);
2354 Set_Exception_Handlers
(Handled_Stmt_Node
, No_List
);
2355 Set_Handled_Statement_Sequence
(Body_Node
, Handled_Stmt_Node
);
2357 if not Debug_Generated_Code
then
2358 Set_Debug_Info_Off
(Proc_Id
);
2361 -- Associate CPP_Init_Proc with type
2363 Set_Init_Proc
(Rec_Type
, Proc_Id
);
2364 end Build_CPP_Init_Procedure
;
2366 --------------------------
2367 -- Build_Init_Procedure --
2368 --------------------------
2370 procedure Build_Init_Procedure
is
2371 Body_Stmts
: List_Id
;
2372 Body_Node
: Node_Id
;
2373 Handled_Stmt_Node
: Node_Id
;
2374 Init_Tags_List
: List_Id
;
2375 Parameters
: List_Id
;
2376 Proc_Spec_Node
: Node_Id
;
2377 Record_Extension_Node
: Node_Id
;
2380 Body_Stmts
:= New_List
;
2381 Body_Node
:= New_Node
(N_Subprogram_Body
, Loc
);
2382 Set_Ekind
(Proc_Id
, E_Procedure
);
2384 Proc_Spec_Node
:= New_Node
(N_Procedure_Specification
, Loc
);
2385 Set_Defining_Unit_Name
(Proc_Spec_Node
, Proc_Id
);
2387 Parameters
:= Init_Formals
(Rec_Type
);
2388 Append_List_To
(Parameters
,
2389 Build_Discriminant_Formals
(Rec_Type
, True));
2391 -- For tagged types, we add a flag to indicate whether the routine
2392 -- is called to initialize a parent component in the init_proc of
2393 -- a type extension. If the flag is false, we do not set the tag
2394 -- because it has been set already in the extension.
2396 if Is_Tagged_Type
(Rec_Type
) then
2397 Set_Tag
:= Make_Temporary
(Loc
, 'P');
2399 Append_To
(Parameters
,
2400 Make_Parameter_Specification
(Loc
,
2401 Defining_Identifier
=> Set_Tag
,
2403 New_Occurrence_Of
(Standard_Boolean
, Loc
),
2405 New_Occurrence_Of
(Standard_True
, Loc
)));
2408 Set_Parameter_Specifications
(Proc_Spec_Node
, Parameters
);
2409 Set_Specification
(Body_Node
, Proc_Spec_Node
);
2410 Set_Declarations
(Body_Node
, Decls
);
2412 -- N is a Derived_Type_Definition that renames the parameters of the
2413 -- ancestor type. We initialize it by expanding our discriminants and
2414 -- call the ancestor _init_proc with a type-converted object.
2416 if Parent_Subtype_Renaming_Discrims
then
2417 Append_List_To
(Body_Stmts
, Build_Init_Call_Thru
(Parameters
));
2419 elsif Nkind
(Type_Definition
(N
)) = N_Record_Definition
then
2420 Build_Discriminant_Assignments
(Body_Stmts
);
2422 if not Null_Present
(Type_Definition
(N
)) then
2423 Append_List_To
(Body_Stmts
,
2424 Build_Init_Statements
(Component_List
(Type_Definition
(N
))));
2427 -- N is a Derived_Type_Definition with a possible non-empty
2428 -- extension. The initialization of a type extension consists in the
2429 -- initialization of the components in the extension.
2432 Build_Discriminant_Assignments
(Body_Stmts
);
2434 Record_Extension_Node
:=
2435 Record_Extension_Part
(Type_Definition
(N
));
2437 if not Null_Present
(Record_Extension_Node
) then
2439 Stmts
: constant List_Id
:=
2440 Build_Init_Statements
(
2441 Component_List
(Record_Extension_Node
));
2444 -- The parent field must be initialized first because the
2445 -- offset of the new discriminants may depend on it. This is
2446 -- not needed if the parent is an interface type because in
2447 -- such case the initialization of the _parent field was not
2450 if not Is_Interface
(Etype
(Rec_Ent
)) then
2452 Parent_IP
: constant Name_Id
:=
2453 Make_Init_Proc_Name
(Etype
(Rec_Ent
));
2459 -- Look for a call to the parent IP at the beginning
2460 -- of Stmts associated with the record extension
2462 Stmt
:= First
(Stmts
);
2464 while Present
(Stmt
) loop
2465 if Nkind
(Stmt
) = N_Procedure_Call_Statement
2466 and then Chars
(Name
(Stmt
)) = Parent_IP
2475 -- If found then move it to the beginning of the
2476 -- statements of this IP routine
2478 if Present
(IP_Call
) then
2479 IP_Stmts
:= New_List
;
2481 Stmt
:= Remove_Head
(Stmts
);
2482 Append_To
(IP_Stmts
, Stmt
);
2483 exit when Stmt
= IP_Call
;
2486 Prepend_List_To
(Body_Stmts
, IP_Stmts
);
2491 Append_List_To
(Body_Stmts
, Stmts
);
2496 -- Add here the assignment to instantiate the Tag
2498 -- The assignment corresponds to the code:
2500 -- _Init._Tag := Typ'Tag;
2502 -- Suppress the tag assignment when not Tagged_Type_Expansion because
2503 -- tags are represented implicitly in objects. It is also suppressed
2504 -- in case of CPP_Class types because in this case the tag is
2505 -- initialized in the C++ side.
2507 if Is_Tagged_Type
(Rec_Type
)
2508 and then Tagged_Type_Expansion
2509 and then not No_Run_Time_Mode
2511 -- Case 1: Ada tagged types with no CPP ancestor. Set the tags of
2512 -- the actual object and invoke the IP of the parent (in this
2513 -- order). The tag must be initialized before the call to the IP
2514 -- of the parent and the assignments to other components because
2515 -- the initial value of the components may depend on the tag (eg.
2516 -- through a dispatching operation on an access to the current
2517 -- type). The tag assignment is not done when initializing the
2518 -- parent component of a type extension, because in that case the
2519 -- tag is set in the extension.
2521 if not Is_CPP_Class
(Root_Type
(Rec_Type
)) then
2523 -- Initialize the primary tag component
2525 Init_Tags_List
:= New_List
(
2526 Make_Assignment_Statement
(Loc
,
2528 Make_Selected_Component
(Loc
,
2529 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
2532 (First_Tag_Component
(Rec_Type
), Loc
)),
2536 (First_Elmt
(Access_Disp_Table
(Rec_Type
))), Loc
)));
2538 -- Ada 2005 (AI-251): Initialize the secondary tags components
2539 -- located at fixed positions (tags whose position depends on
2540 -- variable size components are initialized later ---see below)
2542 if Ada_Version
>= Ada_2005
2543 and then not Is_Interface
(Rec_Type
)
2544 and then Has_Interfaces
(Rec_Type
)
2547 Elab_Sec_DT_Stmts_List
: constant List_Id
:= New_List
;
2548 Elab_List
: List_Id
:= New_List
;
2553 Target
=> Make_Identifier
(Loc
, Name_uInit
),
2554 Init_Tags_List
=> Init_Tags_List
,
2555 Stmts_List
=> Elab_Sec_DT_Stmts_List
,
2556 Fixed_Comps
=> True,
2557 Variable_Comps
=> False);
2559 Elab_List
:= New_List
(
2560 Make_If_Statement
(Loc
,
2561 Condition
=> New_Occurrence_Of
(Set_Tag
, Loc
),
2562 Then_Statements
=> Init_Tags_List
));
2564 if Elab_Flag_Needed
(Rec_Type
) then
2565 Append_To
(Elab_Sec_DT_Stmts_List
,
2566 Make_Assignment_Statement
(Loc
,
2569 (Access_Disp_Table_Elab_Flag
(Rec_Type
),
2572 New_Occurrence_Of
(Standard_False
, Loc
)));
2574 Append_To
(Elab_List
,
2575 Make_If_Statement
(Loc
,
2578 (Access_Disp_Table_Elab_Flag
(Rec_Type
), Loc
),
2579 Then_Statements
=> Elab_Sec_DT_Stmts_List
));
2582 Prepend_List_To
(Body_Stmts
, Elab_List
);
2585 Prepend_To
(Body_Stmts
,
2586 Make_If_Statement
(Loc
,
2587 Condition
=> New_Occurrence_Of
(Set_Tag
, Loc
),
2588 Then_Statements
=> Init_Tags_List
));
2591 -- Case 2: CPP type. The imported C++ constructor takes care of
2592 -- tags initialization. No action needed here because the IP
2593 -- is built by Set_CPP_Constructors; in this case the IP is a
2594 -- wrapper that invokes the C++ constructor and copies the C++
2595 -- tags locally. Done to inherit the C++ slots in Ada derivations
2598 elsif Is_CPP_Class
(Rec_Type
) then
2599 pragma Assert
(False);
2602 -- Case 3: Combined hierarchy containing C++ types and Ada tagged
2603 -- type derivations. Derivations of imported C++ classes add a
2604 -- complication, because we cannot inhibit tag setting in the
2605 -- constructor for the parent. Hence we initialize the tag after
2606 -- the call to the parent IP (that is, in reverse order compared
2607 -- with pure Ada hierarchies ---see comment on case 1).
2610 -- Initialize the primary tag
2612 Init_Tags_List
:= New_List
(
2613 Make_Assignment_Statement
(Loc
,
2615 Make_Selected_Component
(Loc
,
2616 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
2619 (First_Tag_Component
(Rec_Type
), Loc
)),
2623 (First_Elmt
(Access_Disp_Table
(Rec_Type
))), Loc
)));
2625 -- Ada 2005 (AI-251): Initialize the secondary tags components
2626 -- located at fixed positions (tags whose position depends on
2627 -- variable size components are initialized later ---see below)
2629 if Ada_Version
>= Ada_2005
2630 and then not Is_Interface
(Rec_Type
)
2631 and then Has_Interfaces
(Rec_Type
)
2635 Target
=> Make_Identifier
(Loc
, Name_uInit
),
2636 Init_Tags_List
=> Init_Tags_List
,
2637 Stmts_List
=> Init_Tags_List
,
2638 Fixed_Comps
=> True,
2639 Variable_Comps
=> False);
2642 -- Initialize the tag component after invocation of parent IP.
2645 -- parent_IP(_init.parent); // Invokes the C++ constructor
2646 -- [ typIC; ] // Inherit C++ slots from parent
2653 -- Search for the call to the IP of the parent. We assume
2654 -- that the first init_proc call is for the parent.
2656 Ins_Nod
:= First
(Body_Stmts
);
2657 while Present
(Next
(Ins_Nod
))
2658 and then (Nkind
(Ins_Nod
) /= N_Procedure_Call_Statement
2659 or else not Is_Init_Proc
(Name
(Ins_Nod
)))
2664 -- The IC routine copies the inherited slots of the C+ part
2665 -- of the dispatch table from the parent and updates the
2666 -- overridden C++ slots.
2668 if CPP_Num_Prims
(Rec_Type
) > 0 then
2670 Init_DT
: Entity_Id
;
2674 Init_DT
:= CPP_Init_Proc
(Rec_Type
);
2675 pragma Assert
(Present
(Init_DT
));
2678 Make_Procedure_Call_Statement
(Loc
,
2679 New_Occurrence_Of
(Init_DT
, Loc
));
2680 Insert_After
(Ins_Nod
, New_Nod
);
2682 -- Update location of init tag statements
2688 Insert_List_After
(Ins_Nod
, Init_Tags_List
);
2692 -- Ada 2005 (AI-251): Initialize the secondary tag components
2693 -- located at variable positions. We delay the generation of this
2694 -- code until here because the value of the attribute 'Position
2695 -- applied to variable size components of the parent type that
2696 -- depend on discriminants is only safely read at runtime after
2697 -- the parent components have been initialized.
2699 if Ada_Version
>= Ada_2005
2700 and then not Is_Interface
(Rec_Type
)
2701 and then Has_Interfaces
(Rec_Type
)
2702 and then Has_Discriminants
(Etype
(Rec_Type
))
2703 and then Is_Variable_Size_Record
(Etype
(Rec_Type
))
2705 Init_Tags_List
:= New_List
;
2709 Target
=> Make_Identifier
(Loc
, Name_uInit
),
2710 Init_Tags_List
=> Init_Tags_List
,
2711 Stmts_List
=> Init_Tags_List
,
2712 Fixed_Comps
=> False,
2713 Variable_Comps
=> True);
2715 if Is_Non_Empty_List
(Init_Tags_List
) then
2716 Append_List_To
(Body_Stmts
, Init_Tags_List
);
2721 Handled_Stmt_Node
:= New_Node
(N_Handled_Sequence_Of_Statements
, Loc
);
2722 Set_Statements
(Handled_Stmt_Node
, Body_Stmts
);
2725 -- Deep_Finalize (_init, C1, ..., CN);
2729 and then Needs_Finalization
(Rec_Type
)
2730 and then not Is_Abstract_Type
(Rec_Type
)
2731 and then not Restriction_Active
(No_Exception_Propagation
)
2738 -- Create a local version of Deep_Finalize which has indication
2739 -- of partial initialization state.
2742 Make_Defining_Identifier
(Loc
,
2743 Chars
=> New_External_Name
(Name_uFinalizer
));
2745 Append_To
(Decls
, Make_Local_Deep_Finalize
(Rec_Type
, DF_Id
));
2748 Make_Procedure_Call_Statement
(Loc
,
2749 Name
=> New_Occurrence_Of
(DF_Id
, Loc
),
2750 Parameter_Associations
=> New_List
(
2751 Make_Identifier
(Loc
, Name_uInit
),
2752 New_Occurrence_Of
(Standard_False
, Loc
)));
2754 -- Do not emit warnings related to the elaboration order when a
2755 -- controlled object is declared before the body of Finalize is
2758 if Legacy_Elaboration_Checks
then
2759 Set_No_Elaboration_Check
(DF_Call
);
2762 Set_Exception_Handlers
(Handled_Stmt_Node
, New_List
(
2763 Make_Exception_Handler
(Loc
,
2764 Exception_Choices
=> New_List
(
2765 Make_Others_Choice
(Loc
)),
2766 Statements
=> New_List
(
2768 Make_Raise_Statement
(Loc
)))));
2771 Set_Exception_Handlers
(Handled_Stmt_Node
, No_List
);
2774 Set_Handled_Statement_Sequence
(Body_Node
, Handled_Stmt_Node
);
2776 if not Debug_Generated_Code
then
2777 Set_Debug_Info_Off
(Proc_Id
);
2780 -- Associate Init_Proc with type, and determine if the procedure
2781 -- is null (happens because of the Initialize_Scalars pragma case,
2782 -- where we have to generate a null procedure in case it is called
2783 -- by a client with Initialize_Scalars set). Such procedures have
2784 -- to be generated, but do not have to be called, so we mark them
2785 -- as null to suppress the call.
2787 Set_Init_Proc
(Rec_Type
, Proc_Id
);
2789 if List_Length
(Body_Stmts
) = 1
2791 -- We must skip SCIL nodes because they may have been added to this
2792 -- list by Insert_Actions.
2794 and then Nkind
(First_Non_SCIL_Node
(Body_Stmts
)) = N_Null_Statement
2796 Set_Is_Null_Init_Proc
(Proc_Id
);
2798 end Build_Init_Procedure
;
2800 ---------------------------
2801 -- Build_Init_Statements --
2802 ---------------------------
2804 function Build_Init_Statements
(Comp_List
: Node_Id
) return List_Id
is
2805 Checks
: constant List_Id
:= New_List
;
2806 Actions
: List_Id
:= No_List
;
2807 Counter_Id
: Entity_Id
:= Empty
;
2808 Comp_Loc
: Source_Ptr
;
2812 Parent_Stmts
: List_Id
;
2816 procedure Increment_Counter
(Loc
: Source_Ptr
);
2817 -- Generate an "increment by one" statement for the current counter
2818 -- and append it to the list Stmts.
2820 procedure Make_Counter
(Loc
: Source_Ptr
);
2821 -- Create a new counter for the current component list. The routine
2822 -- creates a new defining Id, adds an object declaration and sets
2823 -- the Id generator for the next variant.
2825 -----------------------
2826 -- Increment_Counter --
2827 -----------------------
2829 procedure Increment_Counter
(Loc
: Source_Ptr
) is
2832 -- Counter := Counter + 1;
2835 Make_Assignment_Statement
(Loc
,
2836 Name
=> New_Occurrence_Of
(Counter_Id
, Loc
),
2839 Left_Opnd
=> New_Occurrence_Of
(Counter_Id
, Loc
),
2840 Right_Opnd
=> Make_Integer_Literal
(Loc
, 1))));
2841 end Increment_Counter
;
2847 procedure Make_Counter
(Loc
: Source_Ptr
) is
2849 -- Increment the Id generator
2851 Counter
:= Counter
+ 1;
2853 -- Create the entity and declaration
2856 Make_Defining_Identifier
(Loc
,
2857 Chars
=> New_External_Name
('C', Counter
));
2860 -- Cnn : Integer := 0;
2863 Make_Object_Declaration
(Loc
,
2864 Defining_Identifier
=> Counter_Id
,
2865 Object_Definition
=>
2866 New_Occurrence_Of
(Standard_Integer
, Loc
),
2868 Make_Integer_Literal
(Loc
, 0)));
2871 -- Start of processing for Build_Init_Statements
2874 if Null_Present
(Comp_List
) then
2875 return New_List
(Make_Null_Statement
(Loc
));
2878 Parent_Stmts
:= New_List
;
2881 -- Loop through visible declarations of task types and protected
2882 -- types moving any expanded code from the spec to the body of the
2885 if Is_Task_Record_Type
(Rec_Type
)
2886 or else Is_Protected_Record_Type
(Rec_Type
)
2889 Decl
: constant Node_Id
:=
2890 Parent
(Corresponding_Concurrent_Type
(Rec_Type
));
2896 if Is_Task_Record_Type
(Rec_Type
) then
2897 Def
:= Task_Definition
(Decl
);
2899 Def
:= Protected_Definition
(Decl
);
2902 if Present
(Def
) then
2903 N1
:= First
(Visible_Declarations
(Def
));
2904 while Present
(N1
) loop
2908 if Nkind
(N2
) in N_Statement_Other_Than_Procedure_Call
2909 or else Nkind
(N2
) in N_Raise_xxx_Error
2910 or else Nkind
(N2
) = N_Procedure_Call_Statement
2913 New_Copy_Tree
(N2
, New_Scope
=> Proc_Id
));
2914 Rewrite
(N2
, Make_Null_Statement
(Sloc
(N2
)));
2922 -- Loop through components, skipping pragmas, in 2 steps. The first
2923 -- step deals with regular components. The second step deals with
2924 -- components that have per object constraints and no explicit
2929 -- First pass : regular components
2931 Decl
:= First_Non_Pragma
(Component_Items
(Comp_List
));
2932 while Present
(Decl
) loop
2933 Comp_Loc
:= Sloc
(Decl
);
2935 (Subtype_Indication
(Component_Definition
(Decl
)), Checks
);
2937 Id
:= Defining_Identifier
(Decl
);
2940 -- Leave any processing of per-object constrained component for
2943 if Has_Access_Constraint
(Id
) and then No
(Expression
(Decl
)) then
2946 -- Regular component cases
2949 -- In the context of the init proc, references to discriminants
2950 -- resolve to denote the discriminals: this is where we can
2951 -- freeze discriminant dependent component subtypes.
2953 if not Is_Frozen
(Typ
) then
2954 Append_List_To
(Stmts
, Freeze_Entity
(Typ
, N
));
2957 -- Explicit initialization
2959 if Present
(Expression
(Decl
)) then
2960 if Is_CPP_Constructor_Call
(Expression
(Decl
)) then
2962 Build_Initialization_Call
2965 Make_Selected_Component
(Comp_Loc
,
2967 Make_Identifier
(Comp_Loc
, Name_uInit
),
2969 New_Occurrence_Of
(Id
, Comp_Loc
)),
2971 In_Init_Proc
=> True,
2972 Enclos_Type
=> Rec_Type
,
2973 Discr_Map
=> Discr_Map
,
2974 Constructor_Ref
=> Expression
(Decl
));
2976 Actions
:= Build_Assignment
(Id
, Expression
(Decl
));
2979 -- CPU, Dispatching_Domain, Priority, and Secondary_Stack_Size
2980 -- components are filled in with the corresponding rep-item
2981 -- expression of the concurrent type (if any).
2983 elsif Ekind
(Scope
(Id
)) = E_Record_Type
2984 and then Present
(Corresponding_Concurrent_Type
(Scope
(Id
)))
2985 and then Nam_In
(Chars
(Id
), Name_uCPU
,
2986 Name_uDispatching_Domain
,
2988 Name_uSecondary_Stack_Size
)
2993 pragma Warnings
(Off
, Nam
);
2997 if Chars
(Id
) = Name_uCPU
then
3000 elsif Chars
(Id
) = Name_uDispatching_Domain
then
3001 Nam
:= Name_Dispatching_Domain
;
3003 elsif Chars
(Id
) = Name_uPriority
then
3004 Nam
:= Name_Priority
;
3006 elsif Chars
(Id
) = Name_uSecondary_Stack_Size
then
3007 Nam
:= Name_Secondary_Stack_Size
;
3010 -- Get the Rep Item (aspect specification, attribute
3011 -- definition clause or pragma) of the corresponding
3016 (Corresponding_Concurrent_Type
(Scope
(Id
)),
3018 Check_Parents
=> False);
3020 if Present
(Ritem
) then
3024 if Nkind
(Ritem
) = N_Pragma
then
3025 Exp
:= First
(Pragma_Argument_Associations
(Ritem
));
3027 if Nkind
(Exp
) = N_Pragma_Argument_Association
then
3028 Exp
:= Expression
(Exp
);
3031 -- Conversion for Priority expression
3033 if Nam
= Name_Priority
then
3034 if Pragma_Name
(Ritem
) = Name_Priority
3035 and then not GNAT_Mode
3037 Exp
:= Convert_To
(RTE
(RE_Priority
), Exp
);
3040 Convert_To
(RTE
(RE_Any_Priority
), Exp
);
3044 -- Aspect/Attribute definition clause case
3047 Exp
:= Expression
(Ritem
);
3049 -- Conversion for Priority expression
3051 if Nam
= Name_Priority
then
3052 if Chars
(Ritem
) = Name_Priority
3053 and then not GNAT_Mode
3055 Exp
:= Convert_To
(RTE
(RE_Priority
), Exp
);
3058 Convert_To
(RTE
(RE_Any_Priority
), Exp
);
3063 -- Conversion for Dispatching_Domain value
3065 if Nam
= Name_Dispatching_Domain
then
3067 Unchecked_Convert_To
3068 (RTE
(RE_Dispatching_Domain_Access
), Exp
);
3070 -- Conversion for Secondary_Stack_Size value
3072 elsif Nam
= Name_Secondary_Stack_Size
then
3073 Exp
:= Convert_To
(RTE
(RE_Size_Type
), Exp
);
3076 Actions
:= Build_Assignment
(Id
, Exp
);
3078 -- Nothing needed if no Rep Item
3085 -- Composite component with its own Init_Proc
3087 elsif not Is_Interface
(Typ
)
3088 and then Has_Non_Null_Base_Init_Proc
(Typ
)
3091 Build_Initialization_Call
3093 Make_Selected_Component
(Comp_Loc
,
3095 Make_Identifier
(Comp_Loc
, Name_uInit
),
3096 Selector_Name
=> New_Occurrence_Of
(Id
, Comp_Loc
)),
3098 In_Init_Proc
=> True,
3099 Enclos_Type
=> Rec_Type
,
3100 Discr_Map
=> Discr_Map
);
3102 Clean_Task_Names
(Typ
, Proc_Id
);
3104 -- Simple initialization
3106 elsif Component_Needs_Simple_Initialization
(Typ
) then
3114 Size
=> Esize
(Id
)));
3116 -- Nothing needed for this case
3122 if Present
(Checks
) then
3123 if Chars
(Id
) = Name_uParent
then
3124 Append_List_To
(Parent_Stmts
, Checks
);
3126 Append_List_To
(Stmts
, Checks
);
3130 if Present
(Actions
) then
3131 if Chars
(Id
) = Name_uParent
then
3132 Append_List_To
(Parent_Stmts
, Actions
);
3135 Append_List_To
(Stmts
, Actions
);
3137 -- Preserve initialization state in the current counter
3139 if Needs_Finalization
(Typ
) then
3140 if No
(Counter_Id
) then
3141 Make_Counter
(Comp_Loc
);
3144 Increment_Counter
(Comp_Loc
);
3150 Next_Non_Pragma
(Decl
);
3153 -- The parent field must be initialized first because variable
3154 -- size components of the parent affect the location of all the
3157 Prepend_List_To
(Stmts
, Parent_Stmts
);
3159 -- Set up tasks and protected object support. This needs to be done
3160 -- before any component with a per-object access discriminant
3161 -- constraint, or any variant part (which may contain such
3162 -- components) is initialized, because the initialization of these
3163 -- components may reference the enclosing concurrent object.
3165 -- For a task record type, add the task create call and calls to bind
3166 -- any interrupt (signal) entries.
3168 if Is_Task_Record_Type
(Rec_Type
) then
3170 -- In the case of the restricted run time the ATCB has already
3171 -- been preallocated.
3173 if Restricted_Profile
then
3175 Make_Assignment_Statement
(Loc
,
3177 Make_Selected_Component
(Loc
,
3178 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
3179 Selector_Name
=> Make_Identifier
(Loc
, Name_uTask_Id
)),
3181 Make_Attribute_Reference
(Loc
,
3183 Make_Selected_Component
(Loc
,
3184 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
3185 Selector_Name
=> Make_Identifier
(Loc
, Name_uATCB
)),
3186 Attribute_Name
=> Name_Unchecked_Access
)));
3189 Append_To
(Stmts
, Make_Task_Create_Call
(Rec_Type
));
3192 Task_Type
: constant Entity_Id
:=
3193 Corresponding_Concurrent_Type
(Rec_Type
);
3194 Task_Decl
: constant Node_Id
:= Parent
(Task_Type
);
3195 Task_Def
: constant Node_Id
:= Task_Definition
(Task_Decl
);
3196 Decl_Loc
: Source_Ptr
;
3201 if Present
(Task_Def
) then
3202 Vis_Decl
:= First
(Visible_Declarations
(Task_Def
));
3203 while Present
(Vis_Decl
) loop
3204 Decl_Loc
:= Sloc
(Vis_Decl
);
3206 if Nkind
(Vis_Decl
) = N_Attribute_Definition_Clause
then
3207 if Get_Attribute_Id
(Chars
(Vis_Decl
)) =
3210 Ent
:= Entity
(Name
(Vis_Decl
));
3212 if Ekind
(Ent
) = E_Entry
then
3214 Make_Procedure_Call_Statement
(Decl_Loc
,
3216 New_Occurrence_Of
(RTE
(
3217 RE_Bind_Interrupt_To_Entry
), Decl_Loc
),
3218 Parameter_Associations
=> New_List
(
3219 Make_Selected_Component
(Decl_Loc
,
3221 Make_Identifier
(Decl_Loc
, Name_uInit
),
3224 (Decl_Loc
, Name_uTask_Id
)),
3225 Entry_Index_Expression
3226 (Decl_Loc
, Ent
, Empty
, Task_Type
),
3227 Expression
(Vis_Decl
))));
3238 -- For a protected type, add statements generated by
3239 -- Make_Initialize_Protection.
3241 if Is_Protected_Record_Type
(Rec_Type
) then
3242 Append_List_To
(Stmts
,
3243 Make_Initialize_Protection
(Rec_Type
));
3246 -- Second pass: components with per-object constraints
3249 Decl
:= First_Non_Pragma
(Component_Items
(Comp_List
));
3250 while Present
(Decl
) loop
3251 Comp_Loc
:= Sloc
(Decl
);
3252 Id
:= Defining_Identifier
(Decl
);
3255 if Has_Access_Constraint
(Id
)
3256 and then No
(Expression
(Decl
))
3258 if Has_Non_Null_Base_Init_Proc
(Typ
) then
3259 Append_List_To
(Stmts
,
3260 Build_Initialization_Call
(Comp_Loc
,
3261 Make_Selected_Component
(Comp_Loc
,
3263 Make_Identifier
(Comp_Loc
, Name_uInit
),
3264 Selector_Name
=> New_Occurrence_Of
(Id
, Comp_Loc
)),
3266 In_Init_Proc
=> True,
3267 Enclos_Type
=> Rec_Type
,
3268 Discr_Map
=> Discr_Map
));
3270 Clean_Task_Names
(Typ
, Proc_Id
);
3272 -- Preserve initialization state in the current counter
3274 if Needs_Finalization
(Typ
) then
3275 if No
(Counter_Id
) then
3276 Make_Counter
(Comp_Loc
);
3279 Increment_Counter
(Comp_Loc
);
3282 elsif Component_Needs_Simple_Initialization
(Typ
) then
3283 Append_List_To
(Stmts
,
3290 Size
=> Esize
(Id
))));
3294 Next_Non_Pragma
(Decl
);
3298 -- Process the variant part
3300 if Present
(Variant_Part
(Comp_List
)) then
3302 Variant_Alts
: constant List_Id
:= New_List
;
3303 Var_Loc
: Source_Ptr
:= No_Location
;
3308 First_Non_Pragma
(Variants
(Variant_Part
(Comp_List
)));
3309 while Present
(Variant
) loop
3310 Var_Loc
:= Sloc
(Variant
);
3311 Append_To
(Variant_Alts
,
3312 Make_Case_Statement_Alternative
(Var_Loc
,
3314 New_Copy_List
(Discrete_Choices
(Variant
)),
3316 Build_Init_Statements
(Component_List
(Variant
))));
3317 Next_Non_Pragma
(Variant
);
3320 -- The expression of the case statement which is a reference
3321 -- to one of the discriminants is replaced by the appropriate
3322 -- formal parameter of the initialization procedure.
3325 Make_Case_Statement
(Var_Loc
,
3327 New_Occurrence_Of
(Discriminal
(
3328 Entity
(Name
(Variant_Part
(Comp_List
)))), Var_Loc
),
3329 Alternatives
=> Variant_Alts
));
3333 -- If no initializations when generated for component declarations
3334 -- corresponding to this Stmts, append a null statement to Stmts to
3335 -- to make it a valid Ada tree.
3337 if Is_Empty_List
(Stmts
) then
3338 Append
(Make_Null_Statement
(Loc
), Stmts
);
3344 when RE_Not_Available
=>
3346 end Build_Init_Statements
;
3348 -------------------------
3349 -- Build_Record_Checks --
3350 -------------------------
3352 procedure Build_Record_Checks
(S
: Node_Id
; Check_List
: List_Id
) is
3353 Subtype_Mark_Id
: Entity_Id
;
3355 procedure Constrain_Array
3357 Check_List
: List_Id
);
3358 -- Apply a list of index constraints to an unconstrained array type.
3359 -- The first parameter is the entity for the resulting subtype.
3360 -- Check_List is a list to which the check actions are appended.
3362 ---------------------
3363 -- Constrain_Array --
3364 ---------------------
3366 procedure Constrain_Array
3368 Check_List
: List_Id
)
3370 C
: constant Node_Id
:= Constraint
(SI
);
3371 Number_Of_Constraints
: Nat
:= 0;
3375 procedure Constrain_Index
3378 Check_List
: List_Id
);
3379 -- Process an index constraint in a constrained array declaration.
3380 -- The constraint can be either a subtype name or a range with or
3381 -- without an explicit subtype mark. Index is the corresponding
3382 -- index of the unconstrained array. S is the range expression.
3383 -- Check_List is a list to which the check actions are appended.
3385 ---------------------
3386 -- Constrain_Index --
3387 ---------------------
3389 procedure Constrain_Index
3392 Check_List
: List_Id
)
3394 T
: constant Entity_Id
:= Etype
(Index
);
3397 if Nkind
(S
) = N_Range
then
3398 Process_Range_Expr_In_Decl
(S
, T
, Check_List
=> Check_List
);
3400 end Constrain_Index
;
3402 -- Start of processing for Constrain_Array
3405 T
:= Entity
(Subtype_Mark
(SI
));
3407 if Is_Access_Type
(T
) then
3408 T
:= Designated_Type
(T
);
3411 S
:= First
(Constraints
(C
));
3412 while Present
(S
) loop
3413 Number_Of_Constraints
:= Number_Of_Constraints
+ 1;
3417 -- In either case, the index constraint must provide a discrete
3418 -- range for each index of the array type and the type of each
3419 -- discrete range must be the same as that of the corresponding
3420 -- index. (RM 3.6.1)
3422 S
:= First
(Constraints
(C
));
3423 Index
:= First_Index
(T
);
3426 -- Apply constraints to each index type
3428 for J
in 1 .. Number_Of_Constraints
loop
3429 Constrain_Index
(Index
, S
, Check_List
);
3433 end Constrain_Array
;
3435 -- Start of processing for Build_Record_Checks
3438 if Nkind
(S
) = N_Subtype_Indication
then
3439 Find_Type
(Subtype_Mark
(S
));
3440 Subtype_Mark_Id
:= Entity
(Subtype_Mark
(S
));
3442 -- Remaining processing depends on type
3444 case Ekind
(Subtype_Mark_Id
) is
3446 Constrain_Array
(S
, Check_List
);
3452 end Build_Record_Checks
;
3454 -------------------------------------------
3455 -- Component_Needs_Simple_Initialization --
3456 -------------------------------------------
3458 function Component_Needs_Simple_Initialization
3459 (T
: Entity_Id
) return Boolean
3463 Needs_Simple_Initialization
(T
)
3464 and then not Is_RTE
(T
, RE_Tag
)
3466 -- Ada 2005 (AI-251): Check also the tag of abstract interfaces
3468 and then not Is_RTE
(T
, RE_Interface_Tag
);
3469 end Component_Needs_Simple_Initialization
;
3471 --------------------------------------
3472 -- Parent_Subtype_Renaming_Discrims --
3473 --------------------------------------
3475 function Parent_Subtype_Renaming_Discrims
return Boolean is
3480 if Base_Type
(Rec_Ent
) /= Rec_Ent
then
3484 if Etype
(Rec_Ent
) = Rec_Ent
3485 or else not Has_Discriminants
(Rec_Ent
)
3486 or else Is_Constrained
(Rec_Ent
)
3487 or else Is_Tagged_Type
(Rec_Ent
)
3492 -- If there are no explicit stored discriminants we have inherited
3493 -- the root type discriminants so far, so no renamings occurred.
3495 if First_Discriminant
(Rec_Ent
) =
3496 First_Stored_Discriminant
(Rec_Ent
)
3501 -- Check if we have done some trivial renaming of the parent
3502 -- discriminants, i.e. something like
3504 -- type DT (X1, X2: int) is new PT (X1, X2);
3506 De
:= First_Discriminant
(Rec_Ent
);
3507 Dp
:= First_Discriminant
(Etype
(Rec_Ent
));
3508 while Present
(De
) loop
3509 pragma Assert
(Present
(Dp
));
3511 if Corresponding_Discriminant
(De
) /= Dp
then
3515 Next_Discriminant
(De
);
3516 Next_Discriminant
(Dp
);
3519 return Present
(Dp
);
3520 end Parent_Subtype_Renaming_Discrims
;
3522 ------------------------
3523 -- Requires_Init_Proc --
3524 ------------------------
3526 function Requires_Init_Proc
(Rec_Id
: Entity_Id
) return Boolean is
3527 Comp_Decl
: Node_Id
;
3532 -- Definitely do not need one if specifically suppressed
3534 if Initialization_Suppressed
(Rec_Id
) then
3538 -- If it is a type derived from a type with unknown discriminants,
3539 -- we cannot build an initialization procedure for it.
3541 if Has_Unknown_Discriminants
(Rec_Id
)
3542 or else Has_Unknown_Discriminants
(Etype
(Rec_Id
))
3547 -- Otherwise we need to generate an initialization procedure if
3548 -- Is_CPP_Class is False and at least one of the following applies:
3550 -- 1. Discriminants are present, since they need to be initialized
3551 -- with the appropriate discriminant constraint expressions.
3552 -- However, the discriminant of an unchecked union does not
3553 -- count, since the discriminant is not present.
3555 -- 2. The type is a tagged type, since the implicit Tag component
3556 -- needs to be initialized with a pointer to the dispatch table.
3558 -- 3. The type contains tasks
3560 -- 4. One or more components has an initial value
3562 -- 5. One or more components is for a type which itself requires
3563 -- an initialization procedure.
3565 -- 6. One or more components is a type that requires simple
3566 -- initialization (see Needs_Simple_Initialization), except
3567 -- that types Tag and Interface_Tag are excluded, since fields
3568 -- of these types are initialized by other means.
3570 -- 7. The type is the record type built for a task type (since at
3571 -- the very least, Create_Task must be called)
3573 -- 8. The type is the record type built for a protected type (since
3574 -- at least Initialize_Protection must be called)
3576 -- 9. The type is marked as a public entity. The reason we add this
3577 -- case (even if none of the above apply) is to properly handle
3578 -- Initialize_Scalars. If a package is compiled without an IS
3579 -- pragma, and the client is compiled with an IS pragma, then
3580 -- the client will think an initialization procedure is present
3581 -- and call it, when in fact no such procedure is required, but
3582 -- since the call is generated, there had better be a routine
3583 -- at the other end of the call, even if it does nothing).
3585 -- Note: the reason we exclude the CPP_Class case is because in this
3586 -- case the initialization is performed by the C++ constructors, and
3587 -- the IP is built by Set_CPP_Constructors.
3589 if Is_CPP_Class
(Rec_Id
) then
3592 elsif Is_Interface
(Rec_Id
) then
3595 elsif (Has_Discriminants
(Rec_Id
)
3596 and then not Is_Unchecked_Union
(Rec_Id
))
3597 or else Is_Tagged_Type
(Rec_Id
)
3598 or else Is_Concurrent_Record_Type
(Rec_Id
)
3599 or else Has_Task
(Rec_Id
)
3604 Id
:= First_Component
(Rec_Id
);
3605 while Present
(Id
) loop
3606 Comp_Decl
:= Parent
(Id
);
3609 if Present
(Expression
(Comp_Decl
))
3610 or else Has_Non_Null_Base_Init_Proc
(Typ
)
3611 or else Component_Needs_Simple_Initialization
(Typ
)
3616 Next_Component
(Id
);
3619 -- As explained above, a record initialization procedure is needed
3620 -- for public types in case Initialize_Scalars applies to a client.
3621 -- However, such a procedure is not needed in the case where either
3622 -- of restrictions No_Initialize_Scalars or No_Default_Initialization
3623 -- applies. No_Initialize_Scalars excludes the possibility of using
3624 -- Initialize_Scalars in any partition, and No_Default_Initialization
3625 -- implies that no initialization should ever be done for objects of
3626 -- the type, so is incompatible with Initialize_Scalars.
3628 if not Restriction_Active
(No_Initialize_Scalars
)
3629 and then not Restriction_Active
(No_Default_Initialization
)
3630 and then Is_Public
(Rec_Id
)
3636 end Requires_Init_Proc
;
3638 -- Start of processing for Build_Record_Init_Proc
3641 Rec_Type
:= Defining_Identifier
(N
);
3643 -- This may be full declaration of a private type, in which case
3644 -- the visible entity is a record, and the private entity has been
3645 -- exchanged with it in the private part of the current package.
3646 -- The initialization procedure is built for the record type, which
3647 -- is retrievable from the private entity.
3649 if Is_Incomplete_Or_Private_Type
(Rec_Type
) then
3650 Rec_Type
:= Underlying_Type
(Rec_Type
);
3653 -- If we have a variant record with restriction No_Implicit_Conditionals
3654 -- in effect, then we skip building the procedure. This is safe because
3655 -- if we can see the restriction, so can any caller, calls to initialize
3656 -- such records are not allowed for variant records if this restriction
3659 if Has_Variant_Part
(Rec_Type
)
3660 and then Restriction_Active
(No_Implicit_Conditionals
)
3665 -- If there are discriminants, build the discriminant map to replace
3666 -- discriminants by their discriminals in complex bound expressions.
3667 -- These only arise for the corresponding records of synchronized types.
3669 if Is_Concurrent_Record_Type
(Rec_Type
)
3670 and then Has_Discriminants
(Rec_Type
)
3675 Disc
:= First_Discriminant
(Rec_Type
);
3676 while Present
(Disc
) loop
3677 Append_Elmt
(Disc
, Discr_Map
);
3678 Append_Elmt
(Discriminal
(Disc
), Discr_Map
);
3679 Next_Discriminant
(Disc
);
3684 -- Derived types that have no type extension can use the initialization
3685 -- procedure of their parent and do not need a procedure of their own.
3686 -- This is only correct if there are no representation clauses for the
3687 -- type or its parent, and if the parent has in fact been frozen so
3688 -- that its initialization procedure exists.
3690 if Is_Derived_Type
(Rec_Type
)
3691 and then not Is_Tagged_Type
(Rec_Type
)
3692 and then not Is_Unchecked_Union
(Rec_Type
)
3693 and then not Has_New_Non_Standard_Rep
(Rec_Type
)
3694 and then not Parent_Subtype_Renaming_Discrims
3695 and then Has_Non_Null_Base_Init_Proc
(Etype
(Rec_Type
))
3697 Copy_TSS
(Base_Init_Proc
(Etype
(Rec_Type
)), Rec_Type
);
3699 -- Otherwise if we need an initialization procedure, then build one,
3700 -- mark it as public and inlinable and as having a completion.
3702 elsif Requires_Init_Proc
(Rec_Type
)
3703 or else Is_Unchecked_Union
(Rec_Type
)
3706 Make_Defining_Identifier
(Loc
,
3707 Chars
=> Make_Init_Proc_Name
(Rec_Type
));
3709 -- If No_Default_Initialization restriction is active, then we don't
3710 -- want to build an init_proc, but we need to mark that an init_proc
3711 -- would be needed if this restriction was not active (so that we can
3712 -- detect attempts to call it), so set a dummy init_proc in place.
3714 if Restriction_Active
(No_Default_Initialization
) then
3715 Set_Init_Proc
(Rec_Type
, Proc_Id
);
3719 Build_Offset_To_Top_Functions
;
3720 Build_CPP_Init_Procedure
;
3721 Build_Init_Procedure
;
3723 Set_Is_Public
(Proc_Id
, Is_Public
(Rec_Ent
));
3724 Set_Is_Internal
(Proc_Id
);
3725 Set_Has_Completion
(Proc_Id
);
3727 if not Debug_Generated_Code
then
3728 Set_Debug_Info_Off
(Proc_Id
);
3731 Set_Is_Inlined
(Proc_Id
, Inline_Init_Proc
(Rec_Type
));
3733 -- Do not build an aggregate if Modify_Tree_For_C, this isn't
3734 -- needed and may generate early references to non frozen types
3735 -- since we expand aggregate much more systematically.
3737 if Modify_Tree_For_C
then
3742 Agg
: constant Node_Id
:=
3743 Build_Equivalent_Record_Aggregate
(Rec_Type
);
3745 procedure Collect_Itypes
(Comp
: Node_Id
);
3746 -- Generate references to itypes in the aggregate, because
3747 -- the first use of the aggregate may be in a nested scope.
3749 --------------------
3750 -- Collect_Itypes --
3751 --------------------
3753 procedure Collect_Itypes
(Comp
: Node_Id
) is
3756 Typ
: constant Entity_Id
:= Etype
(Comp
);
3759 if Is_Array_Type
(Typ
) and then Is_Itype
(Typ
) then
3760 Ref
:= Make_Itype_Reference
(Loc
);
3761 Set_Itype
(Ref
, Typ
);
3762 Append_Freeze_Action
(Rec_Type
, Ref
);
3764 Ref
:= Make_Itype_Reference
(Loc
);
3765 Set_Itype
(Ref
, Etype
(First_Index
(Typ
)));
3766 Append_Freeze_Action
(Rec_Type
, Ref
);
3768 -- Recurse on nested arrays
3770 Sub_Aggr
:= First
(Expressions
(Comp
));
3771 while Present
(Sub_Aggr
) loop
3772 Collect_Itypes
(Sub_Aggr
);
3779 -- If there is a static initialization aggregate for the type,
3780 -- generate itype references for the types of its (sub)components,
3781 -- to prevent out-of-scope errors in the resulting tree.
3782 -- The aggregate may have been rewritten as a Raise node, in which
3783 -- case there are no relevant itypes.
3785 if Present
(Agg
) and then Nkind
(Agg
) = N_Aggregate
then
3786 Set_Static_Initialization
(Proc_Id
, Agg
);
3791 Comp
:= First
(Component_Associations
(Agg
));
3792 while Present
(Comp
) loop
3793 Collect_Itypes
(Expression
(Comp
));
3800 end Build_Record_Init_Proc
;
3802 ----------------------------
3803 -- Build_Slice_Assignment --
3804 ----------------------------
3806 -- Generates the following subprogram:
3809 -- (Source, Target : Array_Type,
3810 -- Left_Lo, Left_Hi : Index;
3811 -- Right_Lo, Right_Hi : Index;
3819 -- if Left_Hi < Left_Lo then
3832 -- Target (Li1) := Source (Ri1);
3835 -- exit when Li1 = Left_Lo;
3836 -- Li1 := Index'pred (Li1);
3837 -- Ri1 := Index'pred (Ri1);
3839 -- exit when Li1 = Left_Hi;
3840 -- Li1 := Index'succ (Li1);
3841 -- Ri1 := Index'succ (Ri1);
3846 procedure Build_Slice_Assignment
(Typ
: Entity_Id
) is
3847 Loc
: constant Source_Ptr
:= Sloc
(Typ
);
3848 Index
: constant Entity_Id
:= Base_Type
(Etype
(First_Index
(Typ
)));
3850 Larray
: constant Entity_Id
:= Make_Temporary
(Loc
, 'A');
3851 Rarray
: constant Entity_Id
:= Make_Temporary
(Loc
, 'R');
3852 Left_Lo
: constant Entity_Id
:= Make_Temporary
(Loc
, 'L');
3853 Left_Hi
: constant Entity_Id
:= Make_Temporary
(Loc
, 'L');
3854 Right_Lo
: constant Entity_Id
:= Make_Temporary
(Loc
, 'R');
3855 Right_Hi
: constant Entity_Id
:= Make_Temporary
(Loc
, 'R');
3856 Rev
: constant Entity_Id
:= Make_Temporary
(Loc
, 'D');
3857 -- Formal parameters of procedure
3859 Proc_Name
: constant Entity_Id
:=
3860 Make_Defining_Identifier
(Loc
,
3861 Chars
=> Make_TSS_Name
(Typ
, TSS_Slice_Assign
));
3863 Lnn
: constant Entity_Id
:= Make_Temporary
(Loc
, 'L');
3864 Rnn
: constant Entity_Id
:= Make_Temporary
(Loc
, 'R');
3865 -- Subscripts for left and right sides
3872 -- Build declarations for indexes
3877 Make_Object_Declaration
(Loc
,
3878 Defining_Identifier
=> Lnn
,
3879 Object_Definition
=>
3880 New_Occurrence_Of
(Index
, Loc
)));
3883 Make_Object_Declaration
(Loc
,
3884 Defining_Identifier
=> Rnn
,
3885 Object_Definition
=>
3886 New_Occurrence_Of
(Index
, Loc
)));
3890 -- Build test for empty slice case
3893 Make_If_Statement
(Loc
,
3896 Left_Opnd
=> New_Occurrence_Of
(Left_Hi
, Loc
),
3897 Right_Opnd
=> New_Occurrence_Of
(Left_Lo
, Loc
)),
3898 Then_Statements
=> New_List
(Make_Simple_Return_Statement
(Loc
))));
3900 -- Build initializations for indexes
3903 F_Init
: constant List_Id
:= New_List
;
3904 B_Init
: constant List_Id
:= New_List
;
3908 Make_Assignment_Statement
(Loc
,
3909 Name
=> New_Occurrence_Of
(Lnn
, Loc
),
3910 Expression
=> New_Occurrence_Of
(Left_Lo
, Loc
)));
3913 Make_Assignment_Statement
(Loc
,
3914 Name
=> New_Occurrence_Of
(Rnn
, Loc
),
3915 Expression
=> New_Occurrence_Of
(Right_Lo
, Loc
)));
3918 Make_Assignment_Statement
(Loc
,
3919 Name
=> New_Occurrence_Of
(Lnn
, Loc
),
3920 Expression
=> New_Occurrence_Of
(Left_Hi
, Loc
)));
3923 Make_Assignment_Statement
(Loc
,
3924 Name
=> New_Occurrence_Of
(Rnn
, Loc
),
3925 Expression
=> New_Occurrence_Of
(Right_Hi
, Loc
)));
3928 Make_If_Statement
(Loc
,
3929 Condition
=> New_Occurrence_Of
(Rev
, Loc
),
3930 Then_Statements
=> B_Init
,
3931 Else_Statements
=> F_Init
));
3934 -- Now construct the assignment statement
3937 Make_Loop_Statement
(Loc
,
3938 Statements
=> New_List
(
3939 Make_Assignment_Statement
(Loc
,
3941 Make_Indexed_Component
(Loc
,
3942 Prefix
=> New_Occurrence_Of
(Larray
, Loc
),
3943 Expressions
=> New_List
(New_Occurrence_Of
(Lnn
, Loc
))),
3945 Make_Indexed_Component
(Loc
,
3946 Prefix
=> New_Occurrence_Of
(Rarray
, Loc
),
3947 Expressions
=> New_List
(New_Occurrence_Of
(Rnn
, Loc
))))),
3948 End_Label
=> Empty
);
3950 -- Build the exit condition and increment/decrement statements
3953 F_Ass
: constant List_Id
:= New_List
;
3954 B_Ass
: constant List_Id
:= New_List
;
3958 Make_Exit_Statement
(Loc
,
3961 Left_Opnd
=> New_Occurrence_Of
(Lnn
, Loc
),
3962 Right_Opnd
=> New_Occurrence_Of
(Left_Hi
, Loc
))));
3965 Make_Assignment_Statement
(Loc
,
3966 Name
=> New_Occurrence_Of
(Lnn
, Loc
),
3968 Make_Attribute_Reference
(Loc
,
3970 New_Occurrence_Of
(Index
, Loc
),
3971 Attribute_Name
=> Name_Succ
,
3972 Expressions
=> New_List
(
3973 New_Occurrence_Of
(Lnn
, Loc
)))));
3976 Make_Assignment_Statement
(Loc
,
3977 Name
=> New_Occurrence_Of
(Rnn
, Loc
),
3979 Make_Attribute_Reference
(Loc
,
3981 New_Occurrence_Of
(Index
, Loc
),
3982 Attribute_Name
=> Name_Succ
,
3983 Expressions
=> New_List
(
3984 New_Occurrence_Of
(Rnn
, Loc
)))));
3987 Make_Exit_Statement
(Loc
,
3990 Left_Opnd
=> New_Occurrence_Of
(Lnn
, Loc
),
3991 Right_Opnd
=> New_Occurrence_Of
(Left_Lo
, Loc
))));
3994 Make_Assignment_Statement
(Loc
,
3995 Name
=> New_Occurrence_Of
(Lnn
, Loc
),
3997 Make_Attribute_Reference
(Loc
,
3999 New_Occurrence_Of
(Index
, Loc
),
4000 Attribute_Name
=> Name_Pred
,
4001 Expressions
=> New_List
(
4002 New_Occurrence_Of
(Lnn
, Loc
)))));
4005 Make_Assignment_Statement
(Loc
,
4006 Name
=> New_Occurrence_Of
(Rnn
, Loc
),
4008 Make_Attribute_Reference
(Loc
,
4010 New_Occurrence_Of
(Index
, Loc
),
4011 Attribute_Name
=> Name_Pred
,
4012 Expressions
=> New_List
(
4013 New_Occurrence_Of
(Rnn
, Loc
)))));
4015 Append_To
(Statements
(Loops
),
4016 Make_If_Statement
(Loc
,
4017 Condition
=> New_Occurrence_Of
(Rev
, Loc
),
4018 Then_Statements
=> B_Ass
,
4019 Else_Statements
=> F_Ass
));
4022 Append_To
(Stats
, Loops
);
4026 Formals
: List_Id
:= New_List
;
4029 Formals
:= New_List
(
4030 Make_Parameter_Specification
(Loc
,
4031 Defining_Identifier
=> Larray
,
4032 Out_Present
=> True,
4034 New_Occurrence_Of
(Base_Type
(Typ
), Loc
)),
4036 Make_Parameter_Specification
(Loc
,
4037 Defining_Identifier
=> Rarray
,
4039 New_Occurrence_Of
(Base_Type
(Typ
), Loc
)),
4041 Make_Parameter_Specification
(Loc
,
4042 Defining_Identifier
=> Left_Lo
,
4044 New_Occurrence_Of
(Index
, Loc
)),
4046 Make_Parameter_Specification
(Loc
,
4047 Defining_Identifier
=> Left_Hi
,
4049 New_Occurrence_Of
(Index
, Loc
)),
4051 Make_Parameter_Specification
(Loc
,
4052 Defining_Identifier
=> Right_Lo
,
4054 New_Occurrence_Of
(Index
, Loc
)),
4056 Make_Parameter_Specification
(Loc
,
4057 Defining_Identifier
=> Right_Hi
,
4059 New_Occurrence_Of
(Index
, Loc
)));
4062 Make_Parameter_Specification
(Loc
,
4063 Defining_Identifier
=> Rev
,
4065 New_Occurrence_Of
(Standard_Boolean
, Loc
)));
4068 Make_Procedure_Specification
(Loc
,
4069 Defining_Unit_Name
=> Proc_Name
,
4070 Parameter_Specifications
=> Formals
);
4073 Make_Subprogram_Body
(Loc
,
4074 Specification
=> Spec
,
4075 Declarations
=> Decls
,
4076 Handled_Statement_Sequence
=>
4077 Make_Handled_Sequence_Of_Statements
(Loc
,
4078 Statements
=> Stats
)));
4081 Set_TSS
(Typ
, Proc_Name
);
4082 Set_Is_Pure
(Proc_Name
);
4083 end Build_Slice_Assignment
;
4085 -----------------------------
4086 -- Build_Untagged_Equality --
4087 -----------------------------
4089 procedure Build_Untagged_Equality
(Typ
: Entity_Id
) is
4097 function User_Defined_Eq
(T
: Entity_Id
) return Entity_Id
;
4098 -- Check whether the type T has a user-defined primitive equality. If so
4099 -- return it, else return Empty. If true for a component of Typ, we have
4100 -- to build the primitive equality for it.
4102 ---------------------
4103 -- User_Defined_Eq --
4104 ---------------------
4106 function User_Defined_Eq
(T
: Entity_Id
) return Entity_Id
is
4111 Op
:= TSS
(T
, TSS_Composite_Equality
);
4113 if Present
(Op
) then
4117 Prim
:= First_Elmt
(Collect_Primitive_Operations
(T
));
4118 while Present
(Prim
) loop
4121 if Chars
(Op
) = Name_Op_Eq
4122 and then Etype
(Op
) = Standard_Boolean
4123 and then Etype
(First_Formal
(Op
)) = T
4124 and then Etype
(Next_Formal
(First_Formal
(Op
))) = T
4133 end User_Defined_Eq
;
4135 -- Start of processing for Build_Untagged_Equality
4138 -- If a record component has a primitive equality operation, we must
4139 -- build the corresponding one for the current type.
4142 Comp
:= First_Component
(Typ
);
4143 while Present
(Comp
) loop
4144 if Is_Record_Type
(Etype
(Comp
))
4145 and then Present
(User_Defined_Eq
(Etype
(Comp
)))
4150 Next_Component
(Comp
);
4153 -- If there is a user-defined equality for the type, we do not create
4154 -- the implicit one.
4156 Prim
:= First_Elmt
(Collect_Primitive_Operations
(Typ
));
4158 while Present
(Prim
) loop
4159 if Chars
(Node
(Prim
)) = Name_Op_Eq
4160 and then Comes_From_Source
(Node
(Prim
))
4162 -- Don't we also need to check formal types and return type as in
4163 -- User_Defined_Eq above???
4166 Eq_Op
:= Node
(Prim
);
4174 -- If the type is derived, inherit the operation, if present, from the
4175 -- parent type. It may have been declared after the type derivation. If
4176 -- the parent type itself is derived, it may have inherited an operation
4177 -- that has itself been overridden, so update its alias and related
4178 -- flags. Ditto for inequality.
4180 if No
(Eq_Op
) and then Is_Derived_Type
(Typ
) then
4181 Prim
:= First_Elmt
(Collect_Primitive_Operations
(Etype
(Typ
)));
4182 while Present
(Prim
) loop
4183 if Chars
(Node
(Prim
)) = Name_Op_Eq
then
4184 Copy_TSS
(Node
(Prim
), Typ
);
4188 Op
: constant Entity_Id
:= User_Defined_Eq
(Typ
);
4189 Eq_Op
: constant Entity_Id
:= Node
(Prim
);
4190 NE_Op
: constant Entity_Id
:= Next_Entity
(Eq_Op
);
4193 if Present
(Op
) then
4194 Set_Alias
(Op
, Eq_Op
);
4195 Set_Is_Abstract_Subprogram
4196 (Op
, Is_Abstract_Subprogram
(Eq_Op
));
4198 if Chars
(Next_Entity
(Op
)) = Name_Op_Ne
then
4199 Set_Is_Abstract_Subprogram
4200 (Next_Entity
(Op
), Is_Abstract_Subprogram
(NE_Op
));
4212 -- If not inherited and not user-defined, build body as for a type with
4213 -- tagged components.
4217 Make_Eq_Body
(Typ
, Make_TSS_Name
(Typ
, TSS_Composite_Equality
));
4218 Op
:= Defining_Entity
(Decl
);
4222 if Is_Library_Level_Entity
(Typ
) then
4226 end Build_Untagged_Equality
;
4228 -----------------------------------
4229 -- Build_Variant_Record_Equality --
4230 -----------------------------------
4234 -- function <<Body_Id>> (Left, Right : T) return Boolean is
4235 -- [ X : T renames Left; ]
4236 -- [ Y : T renames Right; ]
4237 -- -- The above renamings are generated only if the parameters of
4238 -- -- this built function (which are passed by the caller) are not
4239 -- -- named 'X' and 'Y'; these names are required to reuse several
4240 -- -- expander routines when generating this body.
4243 -- -- Compare discriminants
4245 -- if X.D1 /= Y.D1 or else X.D2 /= Y.D2 or else ... then
4249 -- -- Compare components
4251 -- if X.C1 /= Y.C1 or else X.C2 /= Y.C2 or else ... then
4255 -- -- Compare variant part
4259 -- if X.C2 /= Y.C2 or else X.C3 /= Y.C3 or else ... then
4264 -- if X.Cn /= Y.Cn or else ... then
4272 function Build_Variant_Record_Equality
4274 Body_Id
: Entity_Id
;
4275 Param_Specs
: List_Id
) return Node_Id
4277 Loc
: constant Source_Ptr
:= Sloc
(Typ
);
4278 Def
: constant Node_Id
:= Parent
(Typ
);
4279 Comps
: constant Node_Id
:= Component_List
(Type_Definition
(Def
));
4280 Left
: constant Entity_Id
:= Defining_Identifier
(First
(Param_Specs
));
4281 Right
: constant Entity_Id
:=
4282 Defining_Identifier
(Next
(First
(Param_Specs
)));
4283 Decls
: constant List_Id
:= New_List
;
4284 Stmts
: constant List_Id
:= New_List
;
4286 Subp_Body
: Node_Id
;
4289 pragma Assert
(not Is_Tagged_Type
(Typ
));
4291 -- In order to reuse the expander routines Make_Eq_If and Make_Eq_Case
4292 -- the name of the formals must be X and Y; otherwise we generate two
4293 -- renaming declarations for such purpose.
4295 if Chars
(Left
) /= Name_X
then
4297 Make_Object_Renaming_Declaration
(Loc
,
4298 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_X
),
4299 Subtype_Mark
=> New_Occurrence_Of
(Typ
, Loc
),
4300 Name
=> Make_Identifier
(Loc
, Chars
(Left
))));
4303 if Chars
(Right
) /= Name_Y
then
4305 Make_Object_Renaming_Declaration
(Loc
,
4306 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_Y
),
4307 Subtype_Mark
=> New_Occurrence_Of
(Typ
, Loc
),
4308 Name
=> Make_Identifier
(Loc
, Chars
(Right
))));
4311 -- Unchecked_Unions require additional machinery to support equality.
4312 -- Two extra parameters (A and B) are added to the equality function
4313 -- parameter list for each discriminant of the type, in order to
4314 -- capture the inferred values of the discriminants in equality calls.
4315 -- The names of the parameters match the names of the corresponding
4316 -- discriminant, with an added suffix.
4318 if Is_Unchecked_Union
(Typ
) then
4323 Discr_Type
: Entity_Id
;
4324 New_Discrs
: Elist_Id
;
4327 New_Discrs
:= New_Elmt_List
;
4329 Discr
:= First_Discriminant
(Typ
);
4330 while Present
(Discr
) loop
4331 Discr_Type
:= Etype
(Discr
);
4334 Make_Defining_Identifier
(Loc
,
4335 Chars
=> New_External_Name
(Chars
(Discr
), 'A'));
4338 Make_Defining_Identifier
(Loc
,
4339 Chars
=> New_External_Name
(Chars
(Discr
), 'B'));
4341 -- Add new parameters to the parameter list
4343 Append_To
(Param_Specs
,
4344 Make_Parameter_Specification
(Loc
,
4345 Defining_Identifier
=> A
,
4347 New_Occurrence_Of
(Discr_Type
, Loc
)));
4349 Append_To
(Param_Specs
,
4350 Make_Parameter_Specification
(Loc
,
4351 Defining_Identifier
=> B
,
4353 New_Occurrence_Of
(Discr_Type
, Loc
)));
4355 Append_Elmt
(A
, New_Discrs
);
4357 -- Generate the following code to compare each of the inferred
4365 Make_If_Statement
(Loc
,
4368 Left_Opnd
=> New_Occurrence_Of
(A
, Loc
),
4369 Right_Opnd
=> New_Occurrence_Of
(B
, Loc
)),
4370 Then_Statements
=> New_List
(
4371 Make_Simple_Return_Statement
(Loc
,
4373 New_Occurrence_Of
(Standard_False
, Loc
)))));
4374 Next_Discriminant
(Discr
);
4377 -- Generate component-by-component comparison. Note that we must
4378 -- propagate the inferred discriminants formals to act as the case
4379 -- statement switch. Their value is added when an equality call on
4380 -- unchecked unions is expanded.
4382 Append_List_To
(Stmts
, Make_Eq_Case
(Typ
, Comps
, New_Discrs
));
4385 -- Normal case (not unchecked union)
4389 Make_Eq_If
(Typ
, Discriminant_Specifications
(Def
)));
4390 Append_List_To
(Stmts
, Make_Eq_Case
(Typ
, Comps
));
4394 Make_Simple_Return_Statement
(Loc
,
4395 Expression
=> New_Occurrence_Of
(Standard_True
, Loc
)));
4398 Make_Subprogram_Body
(Loc
,
4400 Make_Function_Specification
(Loc
,
4401 Defining_Unit_Name
=> Body_Id
,
4402 Parameter_Specifications
=> Param_Specs
,
4403 Result_Definition
=>
4404 New_Occurrence_Of
(Standard_Boolean
, Loc
)),
4405 Declarations
=> Decls
,
4406 Handled_Statement_Sequence
=>
4407 Make_Handled_Sequence_Of_Statements
(Loc
,
4408 Statements
=> Stmts
));
4411 end Build_Variant_Record_Equality
;
4413 -----------------------------
4414 -- Check_Stream_Attributes --
4415 -----------------------------
4417 procedure Check_Stream_Attributes
(Typ
: Entity_Id
) is
4419 Par_Read
: constant Boolean :=
4420 Stream_Attribute_Available
(Typ
, TSS_Stream_Read
)
4421 and then not Has_Specified_Stream_Read
(Typ
);
4422 Par_Write
: constant Boolean :=
4423 Stream_Attribute_Available
(Typ
, TSS_Stream_Write
)
4424 and then not Has_Specified_Stream_Write
(Typ
);
4426 procedure Check_Attr
(Nam
: Name_Id
; TSS_Nam
: TSS_Name_Type
);
4427 -- Check that Comp has a user-specified Nam stream attribute
4433 procedure Check_Attr
(Nam
: Name_Id
; TSS_Nam
: TSS_Name_Type
) is
4435 if not Stream_Attribute_Available
(Etype
(Comp
), TSS_Nam
) then
4436 Error_Msg_Name_1
:= Nam
;
4438 ("|component& in limited extension must have% attribute", Comp
);
4442 -- Start of processing for Check_Stream_Attributes
4445 if Par_Read
or else Par_Write
then
4446 Comp
:= First_Component
(Typ
);
4447 while Present
(Comp
) loop
4448 if Comes_From_Source
(Comp
)
4449 and then Original_Record_Component
(Comp
) = Comp
4450 and then Is_Limited_Type
(Etype
(Comp
))
4453 Check_Attr
(Name_Read
, TSS_Stream_Read
);
4457 Check_Attr
(Name_Write
, TSS_Stream_Write
);
4461 Next_Component
(Comp
);
4464 end Check_Stream_Attributes
;
4466 ----------------------
4467 -- Clean_Task_Names --
4468 ----------------------
4470 procedure Clean_Task_Names
4472 Proc_Id
: Entity_Id
)
4476 and then not Restriction_Active
(No_Implicit_Heap_Allocations
)
4477 and then not Global_Discard_Names
4478 and then Tagged_Type_Expansion
4480 Set_Uses_Sec_Stack
(Proc_Id
);
4482 end Clean_Task_Names
;
4484 ------------------------------
4485 -- Expand_Freeze_Array_Type --
4486 ------------------------------
4488 procedure Expand_Freeze_Array_Type
(N
: Node_Id
) is
4489 Typ
: constant Entity_Id
:= Entity
(N
);
4490 Base
: constant Entity_Id
:= Base_Type
(Typ
);
4491 Comp_Typ
: constant Entity_Id
:= Component_Type
(Typ
);
4494 if not Is_Bit_Packed_Array
(Typ
) then
4496 -- If the component contains tasks, so does the array type. This may
4497 -- not be indicated in the array type because the component may have
4498 -- been a private type at the point of definition. Same if component
4499 -- type is controlled or contains protected objects.
4501 Propagate_Concurrent_Flags
(Base
, Comp_Typ
);
4502 Set_Has_Controlled_Component
4503 (Base
, Has_Controlled_Component
(Comp_Typ
)
4504 or else Is_Controlled
(Comp_Typ
));
4506 if No
(Init_Proc
(Base
)) then
4508 -- If this is an anonymous array created for a declaration with
4509 -- an initial value, its init_proc will never be called. The
4510 -- initial value itself may have been expanded into assignments,
4511 -- in which case the object declaration is carries the
4512 -- No_Initialization flag.
4515 and then Nkind
(Associated_Node_For_Itype
(Base
)) =
4516 N_Object_Declaration
4518 (Present
(Expression
(Associated_Node_For_Itype
(Base
)))
4519 or else No_Initialization
(Associated_Node_For_Itype
(Base
)))
4523 -- We do not need an init proc for string or wide [wide] string,
4524 -- since the only time these need initialization in normalize or
4525 -- initialize scalars mode, and these types are treated specially
4526 -- and do not need initialization procedures.
4528 elsif Is_Standard_String_Type
(Base
) then
4531 -- Otherwise we have to build an init proc for the subtype
4534 Build_Array_Init_Proc
(Base
, N
);
4538 if Typ
= Base
and then Has_Controlled_Component
(Base
) then
4539 Build_Controlling_Procs
(Base
);
4541 if not Is_Limited_Type
(Comp_Typ
)
4542 and then Number_Dimensions
(Typ
) = 1
4544 Build_Slice_Assignment
(Typ
);
4548 -- For packed case, default initialization, except if the component type
4549 -- is itself a packed structure with an initialization procedure, or
4550 -- initialize/normalize scalars active, and we have a base type, or the
4551 -- type is public, because in that case a client might specify
4552 -- Normalize_Scalars and there better be a public Init_Proc for it.
4554 elsif (Present
(Init_Proc
(Component_Type
(Base
)))
4555 and then No
(Base_Init_Proc
(Base
)))
4556 or else (Init_Or_Norm_Scalars
and then Base
= Typ
)
4557 or else Is_Public
(Typ
)
4559 Build_Array_Init_Proc
(Base
, N
);
4561 end Expand_Freeze_Array_Type
;
4563 -----------------------------------
4564 -- Expand_Freeze_Class_Wide_Type --
4565 -----------------------------------
4567 procedure Expand_Freeze_Class_Wide_Type
(N
: Node_Id
) is
4568 function Is_C_Derivation
(Typ
: Entity_Id
) return Boolean;
4569 -- Given a type, determine whether it is derived from a C or C++ root
4571 ---------------------
4572 -- Is_C_Derivation --
4573 ---------------------
4575 function Is_C_Derivation
(Typ
: Entity_Id
) return Boolean is
4582 or else Convention
(T
) = Convention_C
4583 or else Convention
(T
) = Convention_CPP
4588 exit when T
= Etype
(T
);
4594 end Is_C_Derivation
;
4598 Typ
: constant Entity_Id
:= Entity
(N
);
4599 Root
: constant Entity_Id
:= Root_Type
(Typ
);
4601 -- Start of processing for Expand_Freeze_Class_Wide_Type
4604 -- Certain run-time configurations and targets do not provide support
4605 -- for controlled types.
4607 if Restriction_Active
(No_Finalization
) then
4610 -- Do not create TSS routine Finalize_Address when dispatching calls are
4611 -- disabled since the core of the routine is a dispatching call.
4613 elsif Restriction_Active
(No_Dispatching_Calls
) then
4616 -- Do not create TSS routine Finalize_Address for concurrent class-wide
4617 -- types. Ignore C, C++, CIL and Java types since it is assumed that the
4618 -- non-Ada side will handle their destruction.
4620 elsif Is_Concurrent_Type
(Root
)
4621 or else Is_C_Derivation
(Root
)
4622 or else Convention
(Typ
) = Convention_CPP
4626 -- Do not create TSS routine Finalize_Address when compiling in CodePeer
4627 -- mode since the routine contains an Unchecked_Conversion.
4629 elsif CodePeer_Mode
then
4633 -- Create the body of TSS primitive Finalize_Address. This automatically
4634 -- sets the TSS entry for the class-wide type.
4636 Make_Finalize_Address_Body
(Typ
);
4637 end Expand_Freeze_Class_Wide_Type
;
4639 ------------------------------------
4640 -- Expand_Freeze_Enumeration_Type --
4641 ------------------------------------
4643 procedure Expand_Freeze_Enumeration_Type
(N
: Node_Id
) is
4644 Typ
: constant Entity_Id
:= Entity
(N
);
4645 Loc
: constant Source_Ptr
:= Sloc
(Typ
);
4650 Is_Contiguous
: Boolean;
4658 pragma Warnings
(Off
, Func
);
4661 -- Various optimizations possible if given representation is contiguous
4663 Is_Contiguous
:= True;
4665 Ent
:= First_Literal
(Typ
);
4666 Last_Repval
:= Enumeration_Rep
(Ent
);
4669 while Present
(Ent
) loop
4670 if Enumeration_Rep
(Ent
) - Last_Repval
/= 1 then
4671 Is_Contiguous
:= False;
4674 Last_Repval
:= Enumeration_Rep
(Ent
);
4680 if Is_Contiguous
then
4681 Set_Has_Contiguous_Rep
(Typ
);
4682 Ent
:= First_Literal
(Typ
);
4684 Lst
:= New_List
(New_Occurrence_Of
(Ent
, Sloc
(Ent
)));
4687 -- Build list of literal references
4692 Ent
:= First_Literal
(Typ
);
4693 while Present
(Ent
) loop
4694 Append_To
(Lst
, New_Occurrence_Of
(Ent
, Sloc
(Ent
)));
4700 -- Now build an array declaration
4702 -- typA : array (Natural range 0 .. num - 1) of ctype :=
4703 -- (v, v, v, v, v, ....)
4705 -- where ctype is the corresponding integer type. If the representation
4706 -- is contiguous, we only keep the first literal, which provides the
4707 -- offset for Pos_To_Rep computations.
4710 Make_Defining_Identifier
(Loc
,
4711 Chars
=> New_External_Name
(Chars
(Typ
), 'A'));
4713 Append_Freeze_Action
(Typ
,
4714 Make_Object_Declaration
(Loc
,
4715 Defining_Identifier
=> Arr
,
4716 Constant_Present
=> True,
4718 Object_Definition
=>
4719 Make_Constrained_Array_Definition
(Loc
,
4720 Discrete_Subtype_Definitions
=> New_List
(
4721 Make_Subtype_Indication
(Loc
,
4722 Subtype_Mark
=> New_Occurrence_Of
(Standard_Natural
, Loc
),
4724 Make_Range_Constraint
(Loc
,
4728 Make_Integer_Literal
(Loc
, 0),
4730 Make_Integer_Literal
(Loc
, Num
- 1))))),
4732 Component_Definition
=>
4733 Make_Component_Definition
(Loc
,
4734 Aliased_Present
=> False,
4735 Subtype_Indication
=> New_Occurrence_Of
(Typ
, Loc
))),
4738 Make_Aggregate
(Loc
,
4739 Expressions
=> Lst
)));
4741 Set_Enum_Pos_To_Rep
(Typ
, Arr
);
4743 -- Now we build the function that converts representation values to
4744 -- position values. This function has the form:
4746 -- function _Rep_To_Pos (A : etype; F : Boolean) return Integer is
4749 -- when enum-lit'Enum_Rep => return posval;
4750 -- when enum-lit'Enum_Rep => return posval;
4753 -- [raise Constraint_Error when F "invalid data"]
4758 -- Note: the F parameter determines whether the others case (no valid
4759 -- representation) raises Constraint_Error or returns a unique value
4760 -- of minus one. The latter case is used, e.g. in 'Valid code.
4762 -- Note: the reason we use Enum_Rep values in the case here is to avoid
4763 -- the code generator making inappropriate assumptions about the range
4764 -- of the values in the case where the value is invalid. ityp is a
4765 -- signed or unsigned integer type of appropriate width.
4767 -- Note: if exceptions are not supported, then we suppress the raise
4768 -- and return -1 unconditionally (this is an erroneous program in any
4769 -- case and there is no obligation to raise Constraint_Error here). We
4770 -- also do this if pragma Restrictions (No_Exceptions) is active.
4772 -- Is this right??? What about No_Exception_Propagation???
4774 -- Representations are signed
4776 if Enumeration_Rep
(First_Literal
(Typ
)) < 0 then
4778 -- The underlying type is signed. Reset the Is_Unsigned_Type
4779 -- explicitly, because it might have been inherited from
4782 Set_Is_Unsigned_Type
(Typ
, False);
4784 if Esize
(Typ
) <= Standard_Integer_Size
then
4785 Ityp
:= Standard_Integer
;
4787 Ityp
:= Universal_Integer
;
4790 -- Representations are unsigned
4793 if Esize
(Typ
) <= Standard_Integer_Size
then
4794 Ityp
:= RTE
(RE_Unsigned
);
4796 Ityp
:= RTE
(RE_Long_Long_Unsigned
);
4800 -- The body of the function is a case statement. First collect case
4801 -- alternatives, or optimize the contiguous case.
4805 -- If representation is contiguous, Pos is computed by subtracting
4806 -- the representation of the first literal.
4808 if Is_Contiguous
then
4809 Ent
:= First_Literal
(Typ
);
4811 if Enumeration_Rep
(Ent
) = Last_Repval
then
4813 -- Another special case: for a single literal, Pos is zero
4815 Pos_Expr
:= Make_Integer_Literal
(Loc
, Uint_0
);
4819 Convert_To
(Standard_Integer
,
4820 Make_Op_Subtract
(Loc
,
4822 Unchecked_Convert_To
4823 (Ityp
, Make_Identifier
(Loc
, Name_uA
)),
4825 Make_Integer_Literal
(Loc
,
4826 Intval
=> Enumeration_Rep
(First_Literal
(Typ
)))));
4830 Make_Case_Statement_Alternative
(Loc
,
4831 Discrete_Choices
=> New_List
(
4832 Make_Range
(Sloc
(Enumeration_Rep_Expr
(Ent
)),
4834 Make_Integer_Literal
(Loc
,
4835 Intval
=> Enumeration_Rep
(Ent
)),
4837 Make_Integer_Literal
(Loc
, Intval
=> Last_Repval
))),
4839 Statements
=> New_List
(
4840 Make_Simple_Return_Statement
(Loc
,
4841 Expression
=> Pos_Expr
))));
4844 Ent
:= First_Literal
(Typ
);
4845 while Present
(Ent
) loop
4847 Make_Case_Statement_Alternative
(Loc
,
4848 Discrete_Choices
=> New_List
(
4849 Make_Integer_Literal
(Sloc
(Enumeration_Rep_Expr
(Ent
)),
4850 Intval
=> Enumeration_Rep
(Ent
))),
4852 Statements
=> New_List
(
4853 Make_Simple_Return_Statement
(Loc
,
4855 Make_Integer_Literal
(Loc
,
4856 Intval
=> Enumeration_Pos
(Ent
))))));
4862 -- In normal mode, add the others clause with the test.
4863 -- If Predicates_Ignored is True, validity checks do not apply to
4866 if not No_Exception_Handlers_Set
4867 and then not Predicates_Ignored
(Typ
)
4870 Make_Case_Statement_Alternative
(Loc
,
4871 Discrete_Choices
=> New_List
(Make_Others_Choice
(Loc
)),
4872 Statements
=> New_List
(
4873 Make_Raise_Constraint_Error
(Loc
,
4874 Condition
=> Make_Identifier
(Loc
, Name_uF
),
4875 Reason
=> CE_Invalid_Data
),
4876 Make_Simple_Return_Statement
(Loc
,
4877 Expression
=> Make_Integer_Literal
(Loc
, -1)))));
4879 -- If either of the restrictions No_Exceptions_Handlers/Propagation is
4880 -- active then return -1 (we cannot usefully raise Constraint_Error in
4881 -- this case). See description above for further details.
4885 Make_Case_Statement_Alternative
(Loc
,
4886 Discrete_Choices
=> New_List
(Make_Others_Choice
(Loc
)),
4887 Statements
=> New_List
(
4888 Make_Simple_Return_Statement
(Loc
,
4889 Expression
=> Make_Integer_Literal
(Loc
, -1)))));
4892 -- Now we can build the function body
4895 Make_Defining_Identifier
(Loc
, Make_TSS_Name
(Typ
, TSS_Rep_To_Pos
));
4898 Make_Subprogram_Body
(Loc
,
4900 Make_Function_Specification
(Loc
,
4901 Defining_Unit_Name
=> Fent
,
4902 Parameter_Specifications
=> New_List
(
4903 Make_Parameter_Specification
(Loc
,
4904 Defining_Identifier
=>
4905 Make_Defining_Identifier
(Loc
, Name_uA
),
4906 Parameter_Type
=> New_Occurrence_Of
(Typ
, Loc
)),
4907 Make_Parameter_Specification
(Loc
,
4908 Defining_Identifier
=>
4909 Make_Defining_Identifier
(Loc
, Name_uF
),
4911 New_Occurrence_Of
(Standard_Boolean
, Loc
))),
4913 Result_Definition
=> New_Occurrence_Of
(Standard_Integer
, Loc
)),
4915 Declarations
=> Empty_List
,
4917 Handled_Statement_Sequence
=>
4918 Make_Handled_Sequence_Of_Statements
(Loc
,
4919 Statements
=> New_List
(
4920 Make_Case_Statement
(Loc
,
4922 Unchecked_Convert_To
4923 (Ityp
, Make_Identifier
(Loc
, Name_uA
)),
4924 Alternatives
=> Lst
))));
4926 Set_TSS
(Typ
, Fent
);
4928 -- Set Pure flag (it will be reset if the current context is not Pure).
4929 -- We also pretend there was a pragma Pure_Function so that for purposes
4930 -- of optimization and constant-folding, we will consider the function
4931 -- Pure even if we are not in a Pure context).
4934 Set_Has_Pragma_Pure_Function
(Fent
);
4936 -- Unless we are in -gnatD mode, where we are debugging generated code,
4937 -- this is an internal entity for which we don't need debug info.
4939 if not Debug_Generated_Code
then
4940 Set_Debug_Info_Off
(Fent
);
4943 Set_Is_Inlined
(Fent
);
4946 when RE_Not_Available
=>
4948 end Expand_Freeze_Enumeration_Type
;
4950 -------------------------------
4951 -- Expand_Freeze_Record_Type --
4952 -------------------------------
4954 procedure Expand_Freeze_Record_Type
(N
: Node_Id
) is
4955 procedure Build_Variant_Record_Equality
(Typ
: Entity_Id
);
4956 -- Create An Equality function for the untagged variant record Typ and
4957 -- attach it to the TSS list.
4959 -----------------------------------
4960 -- Build_Variant_Record_Equality --
4961 -----------------------------------
4963 procedure Build_Variant_Record_Equality
(Typ
: Entity_Id
) is
4964 Loc
: constant Source_Ptr
:= Sloc
(Typ
);
4965 F
: constant Entity_Id
:=
4966 Make_Defining_Identifier
(Loc
,
4967 Chars
=> Make_TSS_Name
(Typ
, TSS_Composite_Equality
));
4969 -- For a variant record with restriction No_Implicit_Conditionals
4970 -- in effect we skip building the procedure. This is safe because
4971 -- if we can see the restriction, so can any caller, and calls to
4972 -- equality test routines are not allowed for variant records if
4973 -- this restriction is active.
4975 if Restriction_Active
(No_Implicit_Conditionals
) then
4979 -- Derived Unchecked_Union types no longer inherit the equality
4980 -- function of their parent.
4982 if Is_Derived_Type
(Typ
)
4983 and then not Is_Unchecked_Union
(Typ
)
4984 and then not Has_New_Non_Standard_Rep
(Typ
)
4987 Parent_Eq
: constant Entity_Id
:=
4988 TSS
(Root_Type
(Typ
), TSS_Composite_Equality
);
4990 if Present
(Parent_Eq
) then
4991 Copy_TSS
(Parent_Eq
, Typ
);
4998 Build_Variant_Record_Equality
5001 Param_Specs
=> New_List
(
5002 Make_Parameter_Specification
(Loc
,
5003 Defining_Identifier
=>
5004 Make_Defining_Identifier
(Loc
, Name_X
),
5005 Parameter_Type
=> New_Occurrence_Of
(Typ
, Loc
)),
5007 Make_Parameter_Specification
(Loc
,
5008 Defining_Identifier
=>
5009 Make_Defining_Identifier
(Loc
, Name_Y
),
5010 Parameter_Type
=> New_Occurrence_Of
(Typ
, Loc
)))));
5015 if not Debug_Generated_Code
then
5016 Set_Debug_Info_Off
(F
);
5018 end Build_Variant_Record_Equality
;
5022 Typ
: constant Node_Id
:= Entity
(N
);
5023 Typ_Decl
: constant Node_Id
:= Parent
(Typ
);
5026 Comp_Typ
: Entity_Id
;
5027 Predef_List
: List_Id
;
5029 Wrapper_Decl_List
: List_Id
:= No_List
;
5030 Wrapper_Body_List
: List_Id
:= No_List
;
5032 Renamed_Eq
: Node_Id
:= Empty
;
5033 -- Defining unit name for the predefined equality function in the case
5034 -- where the type has a primitive operation that is a renaming of
5035 -- predefined equality (but only if there is also an overriding
5036 -- user-defined equality function). Used to pass this entity from
5037 -- Make_Predefined_Primitive_Specs to Predefined_Primitive_Bodies.
5039 -- Start of processing for Expand_Freeze_Record_Type
5042 -- Build discriminant checking functions if not a derived type (for
5043 -- derived types that are not tagged types, always use the discriminant
5044 -- checking functions of the parent type). However, for untagged types
5045 -- the derivation may have taken place before the parent was frozen, so
5046 -- we copy explicitly the discriminant checking functions from the
5047 -- parent into the components of the derived type.
5049 if not Is_Derived_Type
(Typ
)
5050 or else Has_New_Non_Standard_Rep
(Typ
)
5051 or else Is_Tagged_Type
(Typ
)
5053 Build_Discr_Checking_Funcs
(Typ_Decl
);
5055 elsif Is_Derived_Type
(Typ
)
5056 and then not Is_Tagged_Type
(Typ
)
5058 -- If we have a derived Unchecked_Union, we do not inherit the
5059 -- discriminant checking functions from the parent type since the
5060 -- discriminants are non existent.
5062 and then not Is_Unchecked_Union
(Typ
)
5063 and then Has_Discriminants
(Typ
)
5066 Old_Comp
: Entity_Id
;
5070 First_Component
(Base_Type
(Underlying_Type
(Etype
(Typ
))));
5071 Comp
:= First_Component
(Typ
);
5072 while Present
(Comp
) loop
5073 if Ekind
(Comp
) = E_Component
5074 and then Chars
(Comp
) = Chars
(Old_Comp
)
5076 Set_Discriminant_Checking_Func
5077 (Comp
, Discriminant_Checking_Func
(Old_Comp
));
5080 Next_Component
(Old_Comp
);
5081 Next_Component
(Comp
);
5086 if Is_Derived_Type
(Typ
)
5087 and then Is_Limited_Type
(Typ
)
5088 and then Is_Tagged_Type
(Typ
)
5090 Check_Stream_Attributes
(Typ
);
5093 -- Update task, protected, and controlled component flags, because some
5094 -- of the component types may have been private at the point of the
5095 -- record declaration. Detect anonymous access-to-controlled components.
5097 Comp
:= First_Component
(Typ
);
5098 while Present
(Comp
) loop
5099 Comp_Typ
:= Etype
(Comp
);
5101 Propagate_Concurrent_Flags
(Typ
, Comp_Typ
);
5103 -- Do not set Has_Controlled_Component on a class-wide equivalent
5104 -- type. See Make_CW_Equivalent_Type.
5106 if not Is_Class_Wide_Equivalent_Type
(Typ
)
5108 (Has_Controlled_Component
(Comp_Typ
)
5109 or else (Chars
(Comp
) /= Name_uParent
5110 and then Is_Controlled
(Comp_Typ
)))
5112 Set_Has_Controlled_Component
(Typ
);
5115 Next_Component
(Comp
);
5118 -- Handle constructors of untagged CPP_Class types
5120 if not Is_Tagged_Type
(Typ
) and then Is_CPP_Class
(Typ
) then
5121 Set_CPP_Constructors
(Typ
);
5124 -- Creation of the Dispatch Table. Note that a Dispatch Table is built
5125 -- for regular tagged types as well as for Ada types deriving from a C++
5126 -- Class, but not for tagged types directly corresponding to C++ classes
5127 -- In the later case we assume that it is created in the C++ side and we
5130 if Is_Tagged_Type
(Typ
) then
5132 -- Add the _Tag component
5134 if Underlying_Type
(Etype
(Typ
)) = Typ
then
5135 Expand_Tagged_Root
(Typ
);
5138 if Is_CPP_Class
(Typ
) then
5139 Set_All_DT_Position
(Typ
);
5141 -- Create the tag entities with a minimum decoration
5143 if Tagged_Type_Expansion
then
5144 Append_Freeze_Actions
(Typ
, Make_Tags
(Typ
));
5147 Set_CPP_Constructors
(Typ
);
5150 if not Building_Static_DT
(Typ
) then
5152 -- Usually inherited primitives are not delayed but the first
5153 -- Ada extension of a CPP_Class is an exception since the
5154 -- address of the inherited subprogram has to be inserted in
5155 -- the new Ada Dispatch Table and this is a freezing action.
5157 -- Similarly, if this is an inherited operation whose parent is
5158 -- not frozen yet, it is not in the DT of the parent, and we
5159 -- generate an explicit freeze node for the inherited operation
5160 -- so it is properly inserted in the DT of the current type.
5167 Elmt
:= First_Elmt
(Primitive_Operations
(Typ
));
5168 while Present
(Elmt
) loop
5169 Subp
:= Node
(Elmt
);
5171 if Present
(Alias
(Subp
)) then
5172 if Is_CPP_Class
(Etype
(Typ
)) then
5173 Set_Has_Delayed_Freeze
(Subp
);
5175 elsif Has_Delayed_Freeze
(Alias
(Subp
))
5176 and then not Is_Frozen
(Alias
(Subp
))
5178 Set_Is_Frozen
(Subp
, False);
5179 Set_Has_Delayed_Freeze
(Subp
);
5188 -- Unfreeze momentarily the type to add the predefined primitives
5189 -- operations. The reason we unfreeze is so that these predefined
5190 -- operations will indeed end up as primitive operations (which
5191 -- must be before the freeze point).
5193 Set_Is_Frozen
(Typ
, False);
5195 -- Do not add the spec of predefined primitives in case of
5196 -- CPP tagged type derivations that have convention CPP.
5198 if Is_CPP_Class
(Root_Type
(Typ
))
5199 and then Convention
(Typ
) = Convention_CPP
5203 -- Do not add the spec of the predefined primitives if we are
5204 -- compiling under restriction No_Dispatching_Calls.
5206 elsif not Restriction_Active
(No_Dispatching_Calls
) then
5207 Make_Predefined_Primitive_Specs
(Typ
, Predef_List
, Renamed_Eq
);
5208 Insert_List_Before_And_Analyze
(N
, Predef_List
);
5211 -- Ada 2005 (AI-391): For a nonabstract null extension, create
5212 -- wrapper functions for each nonoverridden inherited function
5213 -- with a controlling result of the type. The wrapper for such
5214 -- a function returns an extension aggregate that invokes the
5217 if Ada_Version
>= Ada_2005
5218 and then not Is_Abstract_Type
(Typ
)
5219 and then Is_Null_Extension
(Typ
)
5221 Make_Controlling_Function_Wrappers
5222 (Typ
, Wrapper_Decl_List
, Wrapper_Body_List
);
5223 Insert_List_Before_And_Analyze
(N
, Wrapper_Decl_List
);
5226 -- Ada 2005 (AI-251): For a nonabstract type extension, build
5227 -- null procedure declarations for each set of homographic null
5228 -- procedures that are inherited from interface types but not
5229 -- overridden. This is done to ensure that the dispatch table
5230 -- entry associated with such null primitives are properly filled.
5232 if Ada_Version
>= Ada_2005
5233 and then Etype
(Typ
) /= Typ
5234 and then not Is_Abstract_Type
(Typ
)
5235 and then Has_Interfaces
(Typ
)
5237 Insert_Actions
(N
, Make_Null_Procedure_Specs
(Typ
));
5240 Set_Is_Frozen
(Typ
);
5242 if not Is_Derived_Type
(Typ
)
5243 or else Is_Tagged_Type
(Etype
(Typ
))
5245 Set_All_DT_Position
(Typ
);
5247 -- If this is a type derived from an untagged private type whose
5248 -- full view is tagged, the type is marked tagged for layout
5249 -- reasons, but it has no dispatch table.
5251 elsif Is_Derived_Type
(Typ
)
5252 and then Is_Private_Type
(Etype
(Typ
))
5253 and then not Is_Tagged_Type
(Etype
(Typ
))
5258 -- Create and decorate the tags. Suppress their creation when
5259 -- not Tagged_Type_Expansion because the dispatching mechanism is
5260 -- handled internally by the virtual target.
5262 if Tagged_Type_Expansion
then
5263 Append_Freeze_Actions
(Typ
, Make_Tags
(Typ
));
5265 -- Generate dispatch table of locally defined tagged type.
5266 -- Dispatch tables of library level tagged types are built
5267 -- later (see Analyze_Declarations).
5269 if not Building_Static_DT
(Typ
) then
5270 Append_Freeze_Actions
(Typ
, Make_DT
(Typ
));
5274 -- If the type has unknown discriminants, propagate dispatching
5275 -- information to its underlying record view, which does not get
5276 -- its own dispatch table.
5278 if Is_Derived_Type
(Typ
)
5279 and then Has_Unknown_Discriminants
(Typ
)
5280 and then Present
(Underlying_Record_View
(Typ
))
5283 Rep
: constant Entity_Id
:= Underlying_Record_View
(Typ
);
5285 Set_Access_Disp_Table
5286 (Rep
, Access_Disp_Table
(Typ
));
5287 Set_Dispatch_Table_Wrappers
5288 (Rep
, Dispatch_Table_Wrappers
(Typ
));
5289 Set_Direct_Primitive_Operations
5290 (Rep
, Direct_Primitive_Operations
(Typ
));
5294 -- Make sure that the primitives Initialize, Adjust and Finalize
5295 -- are Frozen before other TSS subprograms. We don't want them
5298 if Is_Controlled
(Typ
) then
5299 if not Is_Limited_Type
(Typ
) then
5300 Append_Freeze_Actions
(Typ
,
5301 Freeze_Entity
(Find_Prim_Op
(Typ
, Name_Adjust
), Typ
));
5304 Append_Freeze_Actions
(Typ
,
5305 Freeze_Entity
(Find_Prim_Op
(Typ
, Name_Initialize
), Typ
));
5307 Append_Freeze_Actions
(Typ
,
5308 Freeze_Entity
(Find_Prim_Op
(Typ
, Name_Finalize
), Typ
));
5311 -- Freeze rest of primitive operations. There is no need to handle
5312 -- the predefined primitives if we are compiling under restriction
5313 -- No_Dispatching_Calls.
5315 if not Restriction_Active
(No_Dispatching_Calls
) then
5316 Append_Freeze_Actions
(Typ
, Predefined_Primitive_Freeze
(Typ
));
5320 -- In the untagged case, ever since Ada 83 an equality function must
5321 -- be provided for variant records that are not unchecked unions.
5322 -- In Ada 2012 the equality function composes, and thus must be built
5323 -- explicitly just as for tagged records.
5325 elsif Has_Discriminants
(Typ
)
5326 and then not Is_Limited_Type
(Typ
)
5329 Comps
: constant Node_Id
:=
5330 Component_List
(Type_Definition
(Typ_Decl
));
5333 and then Present
(Variant_Part
(Comps
))
5335 Build_Variant_Record_Equality
(Typ
);
5339 -- Otherwise create primitive equality operation (AI05-0123)
5341 -- This is done unconditionally to ensure that tools can be linked
5342 -- properly with user programs compiled with older language versions.
5343 -- In addition, this is needed because "=" composes for bounded strings
5344 -- in all language versions (see Exp_Ch4.Expand_Composite_Equality).
5346 elsif Comes_From_Source
(Typ
)
5347 and then Convention
(Typ
) = Convention_Ada
5348 and then not Is_Limited_Type
(Typ
)
5350 Build_Untagged_Equality
(Typ
);
5353 -- Before building the record initialization procedure, if we are
5354 -- dealing with a concurrent record value type, then we must go through
5355 -- the discriminants, exchanging discriminals between the concurrent
5356 -- type and the concurrent record value type. See the section "Handling
5357 -- of Discriminants" in the Einfo spec for details.
5359 if Is_Concurrent_Record_Type
(Typ
)
5360 and then Has_Discriminants
(Typ
)
5363 Ctyp
: constant Entity_Id
:=
5364 Corresponding_Concurrent_Type
(Typ
);
5365 Conc_Discr
: Entity_Id
;
5366 Rec_Discr
: Entity_Id
;
5370 Conc_Discr
:= First_Discriminant
(Ctyp
);
5371 Rec_Discr
:= First_Discriminant
(Typ
);
5372 while Present
(Conc_Discr
) loop
5373 Temp
:= Discriminal
(Conc_Discr
);
5374 Set_Discriminal
(Conc_Discr
, Discriminal
(Rec_Discr
));
5375 Set_Discriminal
(Rec_Discr
, Temp
);
5377 Set_Discriminal_Link
(Discriminal
(Conc_Discr
), Conc_Discr
);
5378 Set_Discriminal_Link
(Discriminal
(Rec_Discr
), Rec_Discr
);
5380 Next_Discriminant
(Conc_Discr
);
5381 Next_Discriminant
(Rec_Discr
);
5386 if Has_Controlled_Component
(Typ
) then
5387 Build_Controlling_Procs
(Typ
);
5390 Adjust_Discriminants
(Typ
);
5392 -- Do not need init for interfaces on virtual targets since they're
5395 if Tagged_Type_Expansion
or else not Is_Interface
(Typ
) then
5396 Build_Record_Init_Proc
(Typ_Decl
, Typ
);
5399 -- For tagged type that are not interfaces, build bodies of primitive
5400 -- operations. Note: do this after building the record initialization
5401 -- procedure, since the primitive operations may need the initialization
5402 -- routine. There is no need to add predefined primitives of interfaces
5403 -- because all their predefined primitives are abstract.
5405 if Is_Tagged_Type
(Typ
) and then not Is_Interface
(Typ
) then
5407 -- Do not add the body of predefined primitives in case of CPP tagged
5408 -- type derivations that have convention CPP.
5410 if Is_CPP_Class
(Root_Type
(Typ
))
5411 and then Convention
(Typ
) = Convention_CPP
5415 -- Do not add the body of the predefined primitives if we are
5416 -- compiling under restriction No_Dispatching_Calls or if we are
5417 -- compiling a CPP tagged type.
5419 elsif not Restriction_Active
(No_Dispatching_Calls
) then
5421 -- Create the body of TSS primitive Finalize_Address. This must
5422 -- be done before the bodies of all predefined primitives are
5423 -- created. If Typ is limited, Stream_Input and Stream_Read may
5424 -- produce build-in-place allocations and for those the expander
5425 -- needs Finalize_Address.
5427 Make_Finalize_Address_Body
(Typ
);
5428 Predef_List
:= Predefined_Primitive_Bodies
(Typ
, Renamed_Eq
);
5429 Append_Freeze_Actions
(Typ
, Predef_List
);
5432 -- Ada 2005 (AI-391): If any wrappers were created for nonoverridden
5433 -- inherited functions, then add their bodies to the freeze actions.
5435 if Present
(Wrapper_Body_List
) then
5436 Append_Freeze_Actions
(Typ
, Wrapper_Body_List
);
5439 -- Create extra formals for the primitive operations of the type.
5440 -- This must be done before analyzing the body of the initialization
5441 -- procedure, because a self-referential type might call one of these
5442 -- primitives in the body of the init_proc itself.
5449 Elmt
:= First_Elmt
(Primitive_Operations
(Typ
));
5450 while Present
(Elmt
) loop
5451 Subp
:= Node
(Elmt
);
5452 if not Has_Foreign_Convention
(Subp
)
5453 and then not Is_Predefined_Dispatching_Operation
(Subp
)
5455 Create_Extra_Formals
(Subp
);
5462 end Expand_Freeze_Record_Type
;
5464 ------------------------------------
5465 -- Expand_N_Full_Type_Declaration --
5466 ------------------------------------
5468 procedure Expand_N_Full_Type_Declaration
(N
: Node_Id
) is
5469 procedure Build_Master
(Ptr_Typ
: Entity_Id
);
5470 -- Create the master associated with Ptr_Typ
5476 procedure Build_Master
(Ptr_Typ
: Entity_Id
) is
5477 Desig_Typ
: Entity_Id
:= Designated_Type
(Ptr_Typ
);
5480 -- If the designated type is an incomplete view coming from a
5481 -- limited-with'ed package, we need to use the nonlimited view in
5482 -- case it has tasks.
5484 if Ekind
(Desig_Typ
) in Incomplete_Kind
5485 and then Present
(Non_Limited_View
(Desig_Typ
))
5487 Desig_Typ
:= Non_Limited_View
(Desig_Typ
);
5490 -- Anonymous access types are created for the components of the
5491 -- record parameter for an entry declaration. No master is created
5494 if Comes_From_Source
(N
) and then Has_Task
(Desig_Typ
) then
5495 Build_Master_Entity
(Ptr_Typ
);
5496 Build_Master_Renaming
(Ptr_Typ
);
5498 -- Create a class-wide master because a Master_Id must be generated
5499 -- for access-to-limited-class-wide types whose root may be extended
5500 -- with task components.
5502 -- Note: This code covers access-to-limited-interfaces because they
5503 -- can be used to reference tasks implementing them.
5505 elsif Is_Limited_Class_Wide_Type
(Desig_Typ
)
5506 and then Tasking_Allowed
5508 Build_Class_Wide_Master
(Ptr_Typ
);
5512 -- Local declarations
5514 Def_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
5515 B_Id
: constant Entity_Id
:= Base_Type
(Def_Id
);
5519 -- Start of processing for Expand_N_Full_Type_Declaration
5522 if Is_Access_Type
(Def_Id
) then
5523 Build_Master
(Def_Id
);
5525 if Ekind
(Def_Id
) = E_Access_Protected_Subprogram_Type
then
5526 Expand_Access_Protected_Subprogram_Type
(N
);
5529 -- Array of anonymous access-to-task pointers
5531 elsif Ada_Version
>= Ada_2005
5532 and then Is_Array_Type
(Def_Id
)
5533 and then Is_Access_Type
(Component_Type
(Def_Id
))
5534 and then Ekind
(Component_Type
(Def_Id
)) = E_Anonymous_Access_Type
5536 Build_Master
(Component_Type
(Def_Id
));
5538 elsif Has_Task
(Def_Id
) then
5539 Expand_Previous_Access_Type
(Def_Id
);
5541 -- Check the components of a record type or array of records for
5542 -- anonymous access-to-task pointers.
5544 elsif Ada_Version
>= Ada_2005
5545 and then (Is_Record_Type
(Def_Id
)
5547 (Is_Array_Type
(Def_Id
)
5548 and then Is_Record_Type
(Component_Type
(Def_Id
))))
5557 if Is_Array_Type
(Def_Id
) then
5558 Comp
:= First_Entity
(Component_Type
(Def_Id
));
5560 Comp
:= First_Entity
(Def_Id
);
5563 -- Examine all components looking for anonymous access-to-task
5567 while Present
(Comp
) loop
5568 Typ
:= Etype
(Comp
);
5570 if Ekind
(Typ
) = E_Anonymous_Access_Type
5571 and then Has_Task
(Available_View
(Designated_Type
(Typ
)))
5572 and then No
(Master_Id
(Typ
))
5574 -- Ensure that the record or array type have a _master
5577 Build_Master_Entity
(Def_Id
);
5578 Build_Master_Renaming
(Typ
);
5579 M_Id
:= Master_Id
(Typ
);
5583 -- Reuse the same master to service any additional types
5586 Set_Master_Id
(Typ
, M_Id
);
5595 Par_Id
:= Etype
(B_Id
);
5597 -- The parent type is private then we need to inherit any TSS operations
5598 -- from the full view.
5600 if Ekind
(Par_Id
) in Private_Kind
5601 and then Present
(Full_View
(Par_Id
))
5603 Par_Id
:= Base_Type
(Full_View
(Par_Id
));
5606 if Nkind
(Type_Definition
(Original_Node
(N
))) =
5607 N_Derived_Type_Definition
5608 and then not Is_Tagged_Type
(Def_Id
)
5609 and then Present
(Freeze_Node
(Par_Id
))
5610 and then Present
(TSS_Elist
(Freeze_Node
(Par_Id
)))
5612 Ensure_Freeze_Node
(B_Id
);
5613 FN
:= Freeze_Node
(B_Id
);
5615 if No
(TSS_Elist
(FN
)) then
5616 Set_TSS_Elist
(FN
, New_Elmt_List
);
5620 T_E
: constant Elist_Id
:= TSS_Elist
(FN
);
5624 Elmt
:= First_Elmt
(TSS_Elist
(Freeze_Node
(Par_Id
)));
5625 while Present
(Elmt
) loop
5626 if Chars
(Node
(Elmt
)) /= Name_uInit
then
5627 Append_Elmt
(Node
(Elmt
), T_E
);
5633 -- If the derived type itself is private with a full view, then
5634 -- associate the full view with the inherited TSS_Elist as well.
5636 if Ekind
(B_Id
) in Private_Kind
5637 and then Present
(Full_View
(B_Id
))
5639 Ensure_Freeze_Node
(Base_Type
(Full_View
(B_Id
)));
5641 (Freeze_Node
(Base_Type
(Full_View
(B_Id
))), TSS_Elist
(FN
));
5645 end Expand_N_Full_Type_Declaration
;
5647 ---------------------------------
5648 -- Expand_N_Object_Declaration --
5649 ---------------------------------
5651 procedure Expand_N_Object_Declaration
(N
: Node_Id
) is
5652 Loc
: constant Source_Ptr
:= Sloc
(N
);
5653 Def_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
5654 Expr
: constant Node_Id
:= Expression
(N
);
5655 Obj_Def
: constant Node_Id
:= Object_Definition
(N
);
5656 Typ
: constant Entity_Id
:= Etype
(Def_Id
);
5657 Base_Typ
: constant Entity_Id
:= Base_Type
(Typ
);
5660 function Build_Equivalent_Aggregate
return Boolean;
5661 -- If the object has a constrained discriminated type and no initial
5662 -- value, it may be possible to build an equivalent aggregate instead,
5663 -- and prevent an actual call to the initialization procedure.
5665 procedure Count_Default_Sized_Task_Stacks
5667 Pri_Stacks
: out Int
;
5668 Sec_Stacks
: out Int
);
5669 -- Count the number of default-sized primary and secondary task stacks
5670 -- required for task objects contained within type Typ. If the number of
5671 -- task objects contained within the type is not known at compile time
5672 -- the procedure will return the stack counts of zero.
5674 procedure Default_Initialize_Object
(After
: Node_Id
);
5675 -- Generate all default initialization actions for object Def_Id. Any
5676 -- new code is inserted after node After.
5678 function Rewrite_As_Renaming
return Boolean;
5679 -- Indicate whether to rewrite a declaration with initialization into an
5680 -- object renaming declaration (see below).
5682 --------------------------------
5683 -- Build_Equivalent_Aggregate --
5684 --------------------------------
5686 function Build_Equivalent_Aggregate
return Boolean is
5690 Full_Type
: Entity_Id
;
5695 if Is_Private_Type
(Typ
) and then Present
(Full_View
(Typ
)) then
5696 Full_Type
:= Full_View
(Typ
);
5699 -- Only perform this transformation if Elaboration_Code is forbidden
5700 -- or undesirable, and if this is a global entity of a constrained
5703 -- If Initialize_Scalars might be active this transformation cannot
5704 -- be performed either, because it will lead to different semantics
5705 -- or because elaboration code will in fact be created.
5707 if Ekind
(Full_Type
) /= E_Record_Subtype
5708 or else not Has_Discriminants
(Full_Type
)
5709 or else not Is_Constrained
(Full_Type
)
5710 or else Is_Controlled
(Full_Type
)
5711 or else Is_Limited_Type
(Full_Type
)
5712 or else not Restriction_Active
(No_Initialize_Scalars
)
5717 if Ekind
(Current_Scope
) = E_Package
5719 (Restriction_Active
(No_Elaboration_Code
)
5720 or else Is_Preelaborated
(Current_Scope
))
5722 -- Building a static aggregate is possible if the discriminants
5723 -- have static values and the other components have static
5724 -- defaults or none.
5726 Discr
:= First_Elmt
(Discriminant_Constraint
(Full_Type
));
5727 while Present
(Discr
) loop
5728 if not Is_OK_Static_Expression
(Node
(Discr
)) then
5735 -- Check that initialized components are OK, and that non-
5736 -- initialized components do not require a call to their own
5737 -- initialization procedure.
5739 Comp
:= First_Component
(Full_Type
);
5740 while Present
(Comp
) loop
5741 if Ekind
(Comp
) = E_Component
5742 and then Present
(Expression
(Parent
(Comp
)))
5744 not Is_OK_Static_Expression
(Expression
(Parent
(Comp
)))
5748 elsif Has_Non_Null_Base_Init_Proc
(Etype
(Comp
)) then
5753 Next_Component
(Comp
);
5756 -- Everything is static, assemble the aggregate, discriminant
5760 Make_Aggregate
(Loc
,
5761 Expressions
=> New_List
,
5762 Component_Associations
=> New_List
);
5764 Discr
:= First_Elmt
(Discriminant_Constraint
(Full_Type
));
5765 while Present
(Discr
) loop
5766 Append_To
(Expressions
(Aggr
), New_Copy
(Node
(Discr
)));
5770 -- Now collect values of initialized components
5772 Comp
:= First_Component
(Full_Type
);
5773 while Present
(Comp
) loop
5774 if Ekind
(Comp
) = E_Component
5775 and then Present
(Expression
(Parent
(Comp
)))
5777 Append_To
(Component_Associations
(Aggr
),
5778 Make_Component_Association
(Loc
,
5779 Choices
=> New_List
(New_Occurrence_Of
(Comp
, Loc
)),
5780 Expression
=> New_Copy_Tree
5781 (Expression
(Parent
(Comp
)))));
5784 Next_Component
(Comp
);
5787 -- Finally, box-initialize remaining components
5789 Append_To
(Component_Associations
(Aggr
),
5790 Make_Component_Association
(Loc
,
5791 Choices
=> New_List
(Make_Others_Choice
(Loc
)),
5792 Expression
=> Empty
));
5793 Set_Box_Present
(Last
(Component_Associations
(Aggr
)));
5794 Set_Expression
(N
, Aggr
);
5796 if Typ
/= Full_Type
then
5797 Analyze_And_Resolve
(Aggr
, Full_View
(Base_Type
(Full_Type
)));
5798 Rewrite
(Aggr
, Unchecked_Convert_To
(Typ
, Aggr
));
5799 Analyze_And_Resolve
(Aggr
, Typ
);
5801 Analyze_And_Resolve
(Aggr
, Full_Type
);
5809 end Build_Equivalent_Aggregate
;
5811 -------------------------------------
5812 -- Count_Default_Sized_Task_Stacks --
5813 -------------------------------------
5815 procedure Count_Default_Sized_Task_Stacks
5817 Pri_Stacks
: out Int
;
5818 Sec_Stacks
: out Int
)
5820 Component
: Entity_Id
;
5823 -- To calculate the number of default-sized task stacks required for
5824 -- an object of Typ, a depth-first recursive traversal of the AST
5825 -- from the Typ entity node is undertaken. Only type nodes containing
5826 -- task objects are visited.
5831 if not Has_Task
(Typ
) then
5839 -- A task type is found marking the bottom of the descent. If
5840 -- the type has no representation aspect for the corresponding
5841 -- stack then that stack is using the default size.
5843 if Present
(Get_Rep_Item
(Typ
, Name_Storage_Size
)) then
5849 if Present
(Get_Rep_Item
(Typ
, Name_Secondary_Stack_Size
)) then
5855 when E_Array_Subtype
5858 -- First find the number of default stacks contained within an
5861 Count_Default_Sized_Task_Stacks
5862 (Component_Type
(Typ
),
5866 -- Then multiply the result by the size of the array
5869 Quantity
: constant Int
:= Number_Of_Elements_In_Array
(Typ
);
5870 -- Number_Of_Elements_In_Array is non-trival, consequently
5871 -- its result is captured as an optimization.
5874 Pri_Stacks
:= Pri_Stacks
* Quantity
;
5875 Sec_Stacks
:= Sec_Stacks
* Quantity
;
5878 when E_Protected_Subtype
5883 Component
:= First_Component_Or_Discriminant
(Typ
);
5885 -- Recursively descend each component of the composite type
5886 -- looking for tasks, but only if the component is marked as
5889 while Present
(Component
) loop
5890 if Has_Task
(Etype
(Component
)) then
5896 Count_Default_Sized_Task_Stacks
5897 (Etype
(Component
), P
, S
);
5898 Pri_Stacks
:= Pri_Stacks
+ P
;
5899 Sec_Stacks
:= Sec_Stacks
+ S
;
5903 Next_Component_Or_Discriminant
(Component
);
5906 when E_Limited_Private_Subtype
5907 | E_Limited_Private_Type
5908 | E_Record_Subtype_With_Private
5909 | E_Record_Type_With_Private
5911 -- Switch to the full view of the private type to continue
5914 Count_Default_Sized_Task_Stacks
5915 (Full_View
(Typ
), Pri_Stacks
, Sec_Stacks
);
5917 -- Other types should not contain tasks
5920 raise Program_Error
;
5922 end Count_Default_Sized_Task_Stacks
;
5924 -------------------------------
5925 -- Default_Initialize_Object --
5926 -------------------------------
5928 procedure Default_Initialize_Object
(After
: Node_Id
) is
5929 function New_Object_Reference
return Node_Id
;
5930 -- Return a new reference to Def_Id with attributes Assignment_OK and
5931 -- Must_Not_Freeze already set.
5933 function Simple_Initialization_OK
5934 (Init_Typ
: Entity_Id
) return Boolean;
5935 -- Determine whether object declaration N with entity Def_Id needs
5936 -- simple initialization, assuming that it is of type Init_Typ.
5938 --------------------------
5939 -- New_Object_Reference --
5940 --------------------------
5942 function New_Object_Reference
return Node_Id
is
5943 Obj_Ref
: constant Node_Id
:= New_Occurrence_Of
(Def_Id
, Loc
);
5946 -- The call to the type init proc or [Deep_]Finalize must not
5947 -- freeze the related object as the call is internally generated.
5948 -- This way legal rep clauses that apply to the object will not be
5949 -- flagged. Note that the initialization call may be removed if
5950 -- pragma Import is encountered or moved to the freeze actions of
5951 -- the object because of an address clause.
5953 Set_Assignment_OK
(Obj_Ref
);
5954 Set_Must_Not_Freeze
(Obj_Ref
);
5957 end New_Object_Reference
;
5959 ------------------------------
5960 -- Simple_Initialization_OK --
5961 ------------------------------
5963 function Simple_Initialization_OK
5964 (Init_Typ
: Entity_Id
) return Boolean
5967 -- Do not consider the object declaration if it comes with an
5968 -- initialization expression, or is internal in which case it
5969 -- will be assigned later.
5972 not Is_Internal
(Def_Id
)
5973 and then not Has_Init_Expression
(N
)
5974 and then Needs_Simple_Initialization
5978 and then No
(Following_Address_Clause
(N
)));
5979 end Simple_Initialization_OK
;
5983 Exceptions_OK
: constant Boolean :=
5984 not Restriction_Active
(No_Exception_Propagation
);
5986 Aggr_Init
: Node_Id
;
5987 Comp_Init
: List_Id
:= No_List
;
5988 Fin_Block
: Node_Id
;
5990 Init_Stmts
: List_Id
:= No_List
;
5991 Obj_Init
: Node_Id
:= Empty
;
5994 -- Start of processing for Default_Initialize_Object
5997 -- Default initialization is suppressed for objects that are already
5998 -- known to be imported (i.e. whose declaration specifies the Import
5999 -- aspect). Note that for objects with a pragma Import, we generate
6000 -- initialization here, and then remove it downstream when processing
6001 -- the pragma. It is also suppressed for variables for which a pragma
6002 -- Suppress_Initialization has been explicitly given
6004 if Is_Imported
(Def_Id
) or else Suppress_Initialization
(Def_Id
) then
6007 -- Nothing to do if the object being initialized is of a task type
6008 -- and restriction No_Tasking is in effect, because this is a direct
6009 -- violation of the restriction.
6011 elsif Is_Task_Type
(Base_Typ
)
6012 and then Restriction_Active
(No_Tasking
)
6017 -- The expansion performed by this routine is as follows:
6021 -- Type_Init_Proc (Obj);
6024 -- [Deep_]Initialize (Obj);
6028 -- [Deep_]Finalize (Obj, Self => False);
6032 -- Abort_Undefer_Direct;
6035 -- Initialize the components of the object
6037 if Has_Non_Null_Base_Init_Proc
(Typ
)
6038 and then not No_Initialization
(N
)
6039 and then not Initialization_Suppressed
(Typ
)
6041 -- Do not initialize the components if No_Default_Initialization
6042 -- applies as the actual restriction check will occur later when
6043 -- the object is frozen as it is not known yet whether the object
6044 -- is imported or not.
6046 if not Restriction_Active
(No_Default_Initialization
) then
6048 -- If the values of the components are compile-time known, use
6049 -- their prebuilt aggregate form directly.
6051 Aggr_Init
:= Static_Initialization
(Base_Init_Proc
(Typ
));
6053 if Present
(Aggr_Init
) then
6055 New_Copy_Tree
(Aggr_Init
, New_Scope
=> Current_Scope
));
6057 -- If type has discriminants, try to build an equivalent
6058 -- aggregate using discriminant values from the declaration.
6059 -- This is a useful optimization, in particular if restriction
6060 -- No_Elaboration_Code is active.
6062 elsif Build_Equivalent_Aggregate
then
6065 -- Optimize the default initialization of an array object when
6066 -- pragma Initialize_Scalars or Normalize_Scalars is in effect.
6067 -- Construct an in-place initialization aggregate which may be
6068 -- convert into a fast memset by the backend.
6070 elsif Init_Or_Norm_Scalars
6071 and then Is_Array_Type
(Typ
)
6073 -- The array must lack atomic components because they are
6074 -- treated as non-static, and as a result the backend will
6075 -- not initialize the memory in one go.
6077 and then not Has_Atomic_Components
(Typ
)
6079 -- The array must not be packed because the invalid values
6080 -- in System.Scalar_Values are multiples of Storage_Unit.
6082 and then not Is_Packed
(Typ
)
6084 -- The array must have static non-empty ranges, otherwise
6085 -- the backend cannot initialize the memory in one go.
6087 and then Has_Static_Non_Empty_Array_Bounds
(Typ
)
6089 -- The optimization is only relevant for arrays of scalar
6092 and then Is_Scalar_Type
(Component_Type
(Typ
))
6094 -- Similar to regular array initialization using a type
6095 -- init proc, predicate checks are not performed because the
6096 -- initialization values are intentionally invalid, and may
6097 -- violate the predicate.
6099 and then not Has_Predicates
(Component_Type
(Typ
))
6101 -- The component type must have a single initialization value
6103 and then Simple_Initialization_OK
(Component_Type
(Typ
))
6105 Set_No_Initialization
(N
, False);
6110 Size
=> Esize
(Def_Id
)));
6113 (Expression
(N
), Typ
, Suppress
=> All_Checks
);
6115 -- Otherwise invoke the type init proc, generate:
6116 -- Type_Init_Proc (Obj);
6119 Obj_Ref
:= New_Object_Reference
;
6121 if Comes_From_Source
(Def_Id
) then
6122 Initialization_Warning
(Obj_Ref
);
6125 Comp_Init
:= Build_Initialization_Call
(Loc
, Obj_Ref
, Typ
);
6129 -- Provide a default value if the object needs simple initialization
6131 elsif Simple_Initialization_OK
(Typ
) then
6132 Set_No_Initialization
(N
, False);
6137 Size
=> Esize
(Def_Id
)));
6139 Analyze_And_Resolve
(Expression
(N
), Typ
);
6142 -- Initialize the object, generate:
6143 -- [Deep_]Initialize (Obj);
6145 if Needs_Finalization
(Typ
) and then not No_Initialization
(N
) then
6148 (Obj_Ref
=> New_Occurrence_Of
(Def_Id
, Loc
),
6152 -- Build a special finalization block when both the object and its
6153 -- controlled components are to be initialized. The block finalizes
6154 -- the components if the object initialization fails. Generate:
6165 if Has_Controlled_Component
(Typ
)
6166 and then Present
(Comp_Init
)
6167 and then Present
(Obj_Init
)
6168 and then Exceptions_OK
6170 Init_Stmts
:= Comp_Init
;
6174 (Obj_Ref
=> New_Object_Reference
,
6178 if Present
(Fin_Call
) then
6180 -- Do not emit warnings related to the elaboration order when a
6181 -- controlled object is declared before the body of Finalize is
6184 if Legacy_Elaboration_Checks
then
6185 Set_No_Elaboration_Check
(Fin_Call
);
6189 Make_Block_Statement
(Loc
,
6190 Declarations
=> No_List
,
6192 Handled_Statement_Sequence
=>
6193 Make_Handled_Sequence_Of_Statements
(Loc
,
6194 Statements
=> New_List
(Obj_Init
),
6196 Exception_Handlers
=> New_List
(
6197 Make_Exception_Handler
(Loc
,
6198 Exception_Choices
=> New_List
(
6199 Make_Others_Choice
(Loc
)),
6201 Statements
=> New_List
(
6203 Make_Raise_Statement
(Loc
))))));
6205 -- Signal the ABE mechanism that the block carries out
6206 -- initialization actions.
6208 Set_Is_Initialization_Block
(Fin_Block
);
6210 Append_To
(Init_Stmts
, Fin_Block
);
6213 -- Otherwise finalization is not required, the initialization calls
6214 -- are passed to the abort block building circuitry, generate:
6216 -- Type_Init_Proc (Obj);
6217 -- [Deep_]Initialize (Obj);
6220 if Present
(Comp_Init
) then
6221 Init_Stmts
:= Comp_Init
;
6224 if Present
(Obj_Init
) then
6225 if No
(Init_Stmts
) then
6226 Init_Stmts
:= New_List
;
6229 Append_To
(Init_Stmts
, Obj_Init
);
6233 -- Build an abort block to protect the initialization calls
6236 and then Present
(Comp_Init
)
6237 and then Present
(Obj_Init
)
6242 Prepend_To
(Init_Stmts
, Build_Runtime_Call
(Loc
, RE_Abort_Defer
));
6244 -- When exceptions are propagated, abort deferral must take place
6245 -- in the presence of initialization or finalization exceptions.
6252 -- Abort_Undefer_Direct;
6255 if Exceptions_OK
then
6256 Init_Stmts
:= New_List
(
6257 Build_Abort_Undefer_Block
(Loc
,
6258 Stmts
=> Init_Stmts
,
6261 -- Otherwise exceptions are not propagated. Generate:
6268 Append_To
(Init_Stmts
,
6269 Build_Runtime_Call
(Loc
, RE_Abort_Undefer
));
6273 -- Insert the whole initialization sequence into the tree. If the
6274 -- object has a delayed freeze, as will be the case when it has
6275 -- aspect specifications, the initialization sequence is part of
6276 -- the freeze actions.
6278 if Present
(Init_Stmts
) then
6279 if Has_Delayed_Freeze
(Def_Id
) then
6280 Append_Freeze_Actions
(Def_Id
, Init_Stmts
);
6282 Insert_Actions_After
(After
, Init_Stmts
);
6285 end Default_Initialize_Object
;
6287 -------------------------
6288 -- Rewrite_As_Renaming --
6289 -------------------------
6291 function Rewrite_As_Renaming
return Boolean is
6293 -- If the object declaration appears in the form
6295 -- Obj : Ctrl_Typ := Func (...);
6297 -- where Ctrl_Typ is controlled but not immutably limited type, then
6298 -- the expansion of the function call should use a dereference of the
6299 -- result to reference the value on the secondary stack.
6301 -- Obj : Ctrl_Typ renames Func (...).all;
6303 -- As a result, the call avoids an extra copy. This an optimization,
6304 -- but it is required for passing ACATS tests in some cases where it
6305 -- would otherwise make two copies. The RM allows removing redunant
6306 -- Adjust/Finalize calls, but does not allow insertion of extra ones.
6308 -- This part is disabled for now, because it breaks GPS builds
6310 return (False -- ???
6311 and then Nkind
(Expr_Q
) = N_Explicit_Dereference
6312 and then not Comes_From_Source
(Expr_Q
)
6313 and then Nkind
(Original_Node
(Expr_Q
)) = N_Function_Call
6314 and then Nkind
(Object_Definition
(N
)) in N_Has_Entity
6315 and then (Needs_Finalization
(Entity
(Object_Definition
(N
)))))
6317 -- If the initializing expression is for a variable with attribute
6318 -- OK_To_Rename set, then transform:
6320 -- Obj : Typ := Expr;
6324 -- Obj : Typ renames Expr;
6326 -- provided that Obj is not aliased. The aliased case has to be
6327 -- excluded in general because Expr will not be aliased in
6331 (not Aliased_Present
(N
)
6332 and then Is_Entity_Name
(Expr_Q
)
6333 and then Ekind
(Entity
(Expr_Q
)) = E_Variable
6334 and then OK_To_Rename
(Entity
(Expr_Q
))
6335 and then Is_Entity_Name
(Obj_Def
));
6336 end Rewrite_As_Renaming
;
6340 Next_N
: constant Node_Id
:= Next
(N
);
6344 Tag_Assign
: Node_Id
;
6346 Init_After
: Node_Id
:= N
;
6347 -- Node after which the initialization actions are to be inserted. This
6348 -- is normally N, except for the case of a shared passive variable, in
6349 -- which case the init proc call must be inserted only after the bodies
6350 -- of the shared variable procedures have been seen.
6352 -- Start of processing for Expand_N_Object_Declaration
6355 -- Don't do anything for deferred constants. All proper actions will be
6356 -- expanded during the full declaration.
6358 if No
(Expr
) and Constant_Present
(N
) then
6362 -- The type of the object cannot be abstract. This is diagnosed at the
6363 -- point the object is frozen, which happens after the declaration is
6364 -- fully expanded, so simply return now.
6366 if Is_Abstract_Type
(Typ
) then
6370 -- No action needed for the internal imported dummy object added by
6371 -- Make_DT to compute the offset of the components that reference
6372 -- secondary dispatch tables; required to avoid never-ending loop
6373 -- processing this internal object declaration.
6375 if Tagged_Type_Expansion
6376 and then Is_Internal
(Def_Id
)
6377 and then Is_Imported
(Def_Id
)
6378 and then Related_Type
(Def_Id
) = Implementation_Base_Type
(Typ
)
6383 -- First we do special processing for objects of a tagged type where
6384 -- this is the point at which the type is frozen. The creation of the
6385 -- dispatch table and the initialization procedure have to be deferred
6386 -- to this point, since we reference previously declared primitive
6389 -- Force construction of dispatch tables of library level tagged types
6391 if Tagged_Type_Expansion
6392 and then Building_Static_Dispatch_Tables
6393 and then Is_Library_Level_Entity
(Def_Id
)
6394 and then Is_Library_Level_Tagged_Type
(Base_Typ
)
6395 and then Ekind_In
(Base_Typ
, E_Record_Type
,
6398 and then not Has_Dispatch_Table
(Base_Typ
)
6401 New_Nodes
: List_Id
:= No_List
;
6404 if Is_Concurrent_Type
(Base_Typ
) then
6405 New_Nodes
:= Make_DT
(Corresponding_Record_Type
(Base_Typ
), N
);
6407 New_Nodes
:= Make_DT
(Base_Typ
, N
);
6410 if not Is_Empty_List
(New_Nodes
) then
6411 Insert_List_Before
(N
, New_Nodes
);
6416 -- Make shared memory routines for shared passive variable
6418 if Is_Shared_Passive
(Def_Id
) then
6419 Init_After
:= Make_Shared_Var_Procs
(N
);
6422 -- If tasks being declared, make sure we have an activation chain
6423 -- defined for the tasks (has no effect if we already have one), and
6424 -- also that a Master variable is established and that the appropriate
6425 -- enclosing construct is established as a task master.
6427 if Has_Task
(Typ
) then
6428 Build_Activation_Chain_Entity
(N
);
6429 Build_Master_Entity
(Def_Id
);
6432 -- If No_Implicit_Heap_Allocations or No_Implicit_Task_Allocations
6433 -- restrictions are active then default-sized secondary stacks are
6434 -- generated by the binder and allocated by SS_Init. To provide the
6435 -- binder the number of stacks to generate, the number of default-sized
6436 -- stacks required for task objects contained within the object
6437 -- declaration N is calculated here as it is at this point where
6438 -- unconstrained types become constrained. The result is stored in the
6439 -- enclosing unit's Unit_Record.
6441 -- Note if N is an array object declaration that has an initialization
6442 -- expression, a second object declaration for the initialization
6443 -- expression is created by the compiler. To prevent double counting
6444 -- of the stacks in this scenario, the stacks of the first array are
6448 and then not Restriction_Active
(No_Secondary_Stack
)
6449 and then (Restriction_Active
(No_Implicit_Heap_Allocations
)
6450 or else Restriction_Active
(No_Implicit_Task_Allocations
))
6451 and then not (Ekind_In
(Ekind
(Typ
), E_Array_Type
, E_Array_Subtype
)
6452 and then (Has_Init_Expression
(N
)))
6455 PS_Count
, SS_Count
: Int
:= 0;
6457 Count_Default_Sized_Task_Stacks
(Typ
, PS_Count
, SS_Count
);
6458 Increment_Primary_Stack_Count
(PS_Count
);
6459 Increment_Sec_Stack_Count
(SS_Count
);
6463 -- Default initialization required, and no expression present
6467 -- If we have a type with a variant part, the initialization proc
6468 -- will contain implicit tests of the discriminant values, which
6469 -- counts as a violation of the restriction No_Implicit_Conditionals.
6471 if Has_Variant_Part
(Typ
) then
6476 Check_Restriction
(Msg
, No_Implicit_Conditionals
, Obj_Def
);
6480 ("\initialization of variant record tests discriminants",
6487 -- For the default initialization case, if we have a private type
6488 -- with invariants, and invariant checks are enabled, then insert an
6489 -- invariant check after the object declaration. Note that it is OK
6490 -- to clobber the object with an invalid value since if the exception
6491 -- is raised, then the object will go out of scope. In the case where
6492 -- an array object is initialized with an aggregate, the expression
6493 -- is removed. Check flag Has_Init_Expression to avoid generating a
6494 -- junk invariant check and flag No_Initialization to avoid checking
6495 -- an uninitialized object such as a compiler temporary used for an
6498 if Has_Invariants
(Base_Typ
)
6499 and then Present
(Invariant_Procedure
(Base_Typ
))
6500 and then not Has_Init_Expression
(N
)
6501 and then not No_Initialization
(N
)
6503 -- If entity has an address clause or aspect, make invariant
6504 -- call into a freeze action for the explicit freeze node for
6505 -- object. Otherwise insert invariant check after declaration.
6507 if Present
(Following_Address_Clause
(N
))
6508 or else Has_Aspect
(Def_Id
, Aspect_Address
)
6510 Ensure_Freeze_Node
(Def_Id
);
6511 Set_Has_Delayed_Freeze
(Def_Id
);
6512 Set_Is_Frozen
(Def_Id
, False);
6514 if not Partial_View_Has_Unknown_Discr
(Typ
) then
6515 Append_Freeze_Action
(Def_Id
,
6516 Make_Invariant_Call
(New_Occurrence_Of
(Def_Id
, Loc
)));
6519 elsif not Partial_View_Has_Unknown_Discr
(Typ
) then
6521 Make_Invariant_Call
(New_Occurrence_Of
(Def_Id
, Loc
)));
6525 Default_Initialize_Object
(Init_After
);
6527 -- Generate attribute for Persistent_BSS if needed
6529 if Persistent_BSS_Mode
6530 and then Comes_From_Source
(N
)
6531 and then Is_Potentially_Persistent_Type
(Typ
)
6532 and then not Has_Init_Expression
(N
)
6533 and then Is_Library_Level_Entity
(Def_Id
)
6539 Make_Linker_Section_Pragma
6540 (Def_Id
, Sloc
(N
), ".persistent.bss");
6541 Insert_After
(N
, Prag
);
6546 -- If access type, then we know it is null if not initialized
6548 if Is_Access_Type
(Typ
) then
6549 Set_Is_Known_Null
(Def_Id
);
6552 -- Explicit initialization present
6555 -- Obtain actual expression from qualified expression
6557 if Nkind
(Expr
) = N_Qualified_Expression
then
6558 Expr_Q
:= Expression
(Expr
);
6563 -- When we have the appropriate type of aggregate in the expression
6564 -- (it has been determined during analysis of the aggregate by
6565 -- setting the delay flag), let's perform in place assignment and
6566 -- thus avoid creating a temporary.
6568 if Is_Delayed_Aggregate
(Expr_Q
) then
6569 Convert_Aggr_In_Object_Decl
(N
);
6571 -- Ada 2005 (AI-318-02): If the initialization expression is a call
6572 -- to a build-in-place function, then access to the declared object
6573 -- must be passed to the function. Currently we limit such functions
6574 -- to those with constrained limited result subtypes, but eventually
6575 -- plan to expand the allowed forms of functions that are treated as
6578 elsif Is_Build_In_Place_Function_Call
(Expr_Q
) then
6579 Make_Build_In_Place_Call_In_Object_Declaration
(N
, Expr_Q
);
6581 -- The previous call expands the expression initializing the
6582 -- built-in-place object into further code that will be analyzed
6583 -- later. No further expansion needed here.
6587 -- This is the same as the previous 'elsif', except that the call has
6588 -- been transformed by other expansion activities into something like
6589 -- F(...)'Reference.
6591 elsif Nkind
(Expr_Q
) = N_Reference
6592 and then Is_Build_In_Place_Function_Call
(Prefix
(Expr_Q
))
6593 and then not Is_Expanded_Build_In_Place_Call
6594 (Unqual_Conv
(Prefix
(Expr_Q
)))
6596 Make_Build_In_Place_Call_In_Anonymous_Context
(Prefix
(Expr_Q
));
6598 -- The previous call expands the expression initializing the
6599 -- built-in-place object into further code that will be analyzed
6600 -- later. No further expansion needed here.
6604 -- Ada 2005 (AI-318-02): Specialization of the previous case for
6605 -- expressions containing a build-in-place function call whose
6606 -- returned object covers interface types, and Expr_Q has calls to
6607 -- Ada.Tags.Displace to displace the pointer to the returned build-
6608 -- in-place object to reference the secondary dispatch table of a
6609 -- covered interface type.
6611 elsif Present
(Unqual_BIP_Iface_Function_Call
(Expr_Q
)) then
6612 Make_Build_In_Place_Iface_Call_In_Object_Declaration
(N
, Expr_Q
);
6614 -- The previous call expands the expression initializing the
6615 -- built-in-place object into further code that will be analyzed
6616 -- later. No further expansion needed here.
6620 -- Ada 2005 (AI-251): Rewrite the expression that initializes a
6621 -- class-wide interface object to ensure that we copy the full
6622 -- object, unless we are targetting a VM where interfaces are handled
6623 -- by VM itself. Note that if the root type of Typ is an ancestor of
6624 -- Expr's type, both types share the same dispatch table and there is
6625 -- no need to displace the pointer.
6627 elsif Is_Interface
(Typ
)
6629 -- Avoid never-ending recursion because if Equivalent_Type is set
6630 -- then we've done it already and must not do it again.
6633 (Nkind
(Obj_Def
) = N_Identifier
6634 and then Present
(Equivalent_Type
(Entity
(Obj_Def
))))
6636 pragma Assert
(Is_Class_Wide_Type
(Typ
));
6638 -- If the object is a return object of an inherently limited type,
6639 -- which implies build-in-place treatment, bypass the special
6640 -- treatment of class-wide interface initialization below. In this
6641 -- case, the expansion of the return statement will take care of
6642 -- creating the object (via allocator) and initializing it.
6644 if Is_Return_Object
(Def_Id
) and then Is_Limited_View
(Typ
) then
6647 elsif Tagged_Type_Expansion
then
6649 Iface
: constant Entity_Id
:= Root_Type
(Typ
);
6650 Expr_N
: Node_Id
:= Expr
;
6651 Expr_Typ
: Entity_Id
;
6657 -- If the original node of the expression was a conversion
6658 -- to this specific class-wide interface type then restore
6659 -- the original node because we must copy the object before
6660 -- displacing the pointer to reference the secondary tag
6661 -- component. This code must be kept synchronized with the
6662 -- expansion done by routine Expand_Interface_Conversion
6664 if not Comes_From_Source
(Expr_N
)
6665 and then Nkind
(Expr_N
) = N_Explicit_Dereference
6666 and then Nkind
(Original_Node
(Expr_N
)) = N_Type_Conversion
6667 and then Etype
(Original_Node
(Expr_N
)) = Typ
6669 Rewrite
(Expr_N
, Original_Node
(Expression
(N
)));
6672 -- Avoid expansion of redundant interface conversion
6674 if Is_Interface
(Etype
(Expr_N
))
6675 and then Nkind
(Expr_N
) = N_Type_Conversion
6676 and then Etype
(Expr_N
) = Typ
6678 Expr_N
:= Expression
(Expr_N
);
6679 Set_Expression
(N
, Expr_N
);
6682 Obj_Id
:= Make_Temporary
(Loc
, 'D', Expr_N
);
6683 Expr_Typ
:= Base_Type
(Etype
(Expr_N
));
6685 if Is_Class_Wide_Type
(Expr_Typ
) then
6686 Expr_Typ
:= Root_Type
(Expr_Typ
);
6690 -- CW : I'Class := Obj;
6693 -- type Ityp is not null access I'Class;
6694 -- CW : I'Class renames Ityp (Tmp.I_Tag'Address).all;
6696 if Comes_From_Source
(Expr_N
)
6697 and then Nkind
(Expr_N
) = N_Identifier
6698 and then not Is_Interface
(Expr_Typ
)
6699 and then Interface_Present_In_Ancestor
(Expr_Typ
, Typ
)
6700 and then (Expr_Typ
= Etype
(Expr_Typ
)
6702 Is_Variable_Size_Record
(Etype
(Expr_Typ
)))
6707 Make_Object_Declaration
(Loc
,
6708 Defining_Identifier
=> Obj_Id
,
6709 Object_Definition
=>
6710 New_Occurrence_Of
(Expr_Typ
, Loc
),
6711 Expression
=> Relocate_Node
(Expr_N
)));
6713 -- Statically reference the tag associated with the
6717 Make_Selected_Component
(Loc
,
6718 Prefix
=> New_Occurrence_Of
(Obj_Id
, Loc
),
6721 (Find_Interface_Tag
(Expr_Typ
, Iface
), Loc
));
6724 -- IW : I'Class := Obj;
6726 -- type Equiv_Record is record ... end record;
6727 -- implicit subtype CW is <Class_Wide_Subtype>;
6728 -- Tmp : CW := CW!(Obj);
6729 -- type Ityp is not null access I'Class;
6730 -- IW : I'Class renames
6731 -- Ityp!(Displace (Temp'Address, I'Tag)).all;
6734 -- Generate the equivalent record type and update the
6735 -- subtype indication to reference it.
6737 Expand_Subtype_From_Expr
6740 Subtype_Indic
=> Obj_Def
,
6743 if not Is_Interface
(Etype
(Expr_N
)) then
6744 New_Expr
:= Relocate_Node
(Expr_N
);
6746 -- For interface types we use 'Address which displaces
6747 -- the pointer to the base of the object (if required)
6751 Unchecked_Convert_To
(Etype
(Obj_Def
),
6752 Make_Explicit_Dereference
(Loc
,
6753 Unchecked_Convert_To
(RTE
(RE_Tag_Ptr
),
6754 Make_Attribute_Reference
(Loc
,
6755 Prefix
=> Relocate_Node
(Expr_N
),
6756 Attribute_Name
=> Name_Address
))));
6761 if not Is_Limited_Record
(Expr_Typ
) then
6763 Make_Object_Declaration
(Loc
,
6764 Defining_Identifier
=> Obj_Id
,
6765 Object_Definition
=>
6766 New_Occurrence_Of
(Etype
(Obj_Def
), Loc
),
6767 Expression
=> New_Expr
));
6769 -- Rename limited type object since they cannot be copied
6770 -- This case occurs when the initialization expression
6771 -- has been previously expanded into a temporary object.
6773 else pragma Assert
(not Comes_From_Source
(Expr_Q
));
6775 Make_Object_Renaming_Declaration
(Loc
,
6776 Defining_Identifier
=> Obj_Id
,
6778 New_Occurrence_Of
(Etype
(Obj_Def
), Loc
),
6780 Unchecked_Convert_To
6781 (Etype
(Obj_Def
), New_Expr
)));
6784 -- Dynamically reference the tag associated with the
6788 Make_Function_Call
(Loc
,
6789 Name
=> New_Occurrence_Of
(RTE
(RE_Displace
), Loc
),
6790 Parameter_Associations
=> New_List
(
6791 Make_Attribute_Reference
(Loc
,
6792 Prefix
=> New_Occurrence_Of
(Obj_Id
, Loc
),
6793 Attribute_Name
=> Name_Address
),
6795 (Node
(First_Elmt
(Access_Disp_Table
(Iface
))),
6800 Make_Object_Renaming_Declaration
(Loc
,
6801 Defining_Identifier
=> Make_Temporary
(Loc
, 'D'),
6802 Subtype_Mark
=> New_Occurrence_Of
(Typ
, Loc
),
6804 Convert_Tag_To_Interface
(Typ
, Tag_Comp
)));
6806 -- If the original entity comes from source, then mark the
6807 -- new entity as needing debug information, even though it's
6808 -- defined by a generated renaming that does not come from
6809 -- source, so that Materialize_Entity will be set on the
6810 -- entity when Debug_Renaming_Declaration is called during
6813 if Comes_From_Source
(Def_Id
) then
6814 Set_Debug_Info_Needed
(Defining_Identifier
(N
));
6817 Analyze
(N
, Suppress
=> All_Checks
);
6819 -- Replace internal identifier of rewritten node by the
6820 -- identifier found in the sources. We also have to exchange
6821 -- entities containing their defining identifiers to ensure
6822 -- the correct replacement of the object declaration by this
6823 -- object renaming declaration because these identifiers
6824 -- were previously added by Enter_Name to the current scope.
6825 -- We must preserve the homonym chain of the source entity
6826 -- as well. We must also preserve the kind of the entity,
6827 -- which may be a constant. Preserve entity chain because
6828 -- itypes may have been generated already, and the full
6829 -- chain must be preserved for final freezing. Finally,
6830 -- preserve Comes_From_Source setting, so that debugging
6831 -- and cross-referencing information is properly kept, and
6832 -- preserve source location, to prevent spurious errors when
6833 -- entities are declared (they must have their own Sloc).
6836 New_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
6837 Next_Temp
: constant Entity_Id
:= Next_Entity
(New_Id
);
6838 Save_CFS
: constant Boolean :=
6839 Comes_From_Source
(Def_Id
);
6840 Save_SP
: constant Node_Id
:= SPARK_Pragma
(Def_Id
);
6841 Save_SPI
: constant Boolean :=
6842 SPARK_Pragma_Inherited
(Def_Id
);
6845 Link_Entities
(New_Id
, Next_Entity
(Def_Id
));
6846 Link_Entities
(Def_Id
, Next_Temp
);
6848 Set_Chars
(Defining_Identifier
(N
), Chars
(Def_Id
));
6849 Set_Homonym
(Defining_Identifier
(N
), Homonym
(Def_Id
));
6850 Set_Ekind
(Defining_Identifier
(N
), Ekind
(Def_Id
));
6851 Set_Sloc
(Defining_Identifier
(N
), Sloc
(Def_Id
));
6853 Set_Comes_From_Source
(Def_Id
, False);
6855 -- ??? This is extremely dangerous!!! Exchanging entities
6856 -- is very low level, and as a result it resets flags and
6857 -- fields which belong to the original Def_Id. Several of
6858 -- these attributes are saved and restored, but there may
6859 -- be many more that need to be preserverd.
6861 Exchange_Entities
(Defining_Identifier
(N
), Def_Id
);
6863 -- Restore clobbered attributes
6865 Set_Comes_From_Source
(Def_Id
, Save_CFS
);
6866 Set_SPARK_Pragma
(Def_Id
, Save_SP
);
6867 Set_SPARK_Pragma_Inherited
(Def_Id
, Save_SPI
);
6874 -- Common case of explicit object initialization
6877 -- In most cases, we must check that the initial value meets any
6878 -- constraint imposed by the declared type. However, there is one
6879 -- very important exception to this rule. If the entity has an
6880 -- unconstrained nominal subtype, then it acquired its constraints
6881 -- from the expression in the first place, and not only does this
6882 -- mean that the constraint check is not needed, but an attempt to
6883 -- perform the constraint check can cause order of elaboration
6886 if not Is_Constr_Subt_For_U_Nominal
(Typ
) then
6888 -- If this is an allocator for an aggregate that has been
6889 -- allocated in place, delay checks until assignments are
6890 -- made, because the discriminants are not initialized.
6892 if Nkind
(Expr
) = N_Allocator
6893 and then No_Initialization
(Expr
)
6897 -- Otherwise apply a constraint check now if no prev error
6899 elsif Nkind
(Expr
) /= N_Error
then
6900 Apply_Constraint_Check
(Expr
, Typ
);
6902 -- Deal with possible range check
6904 if Do_Range_Check
(Expr
) then
6906 -- If assignment checks are suppressed, turn off flag
6908 if Suppress_Assignment_Checks
(N
) then
6909 Set_Do_Range_Check
(Expr
, False);
6911 -- Otherwise generate the range check
6914 Generate_Range_Check
6915 (Expr
, Typ
, CE_Range_Check_Failed
);
6921 -- If the type is controlled and not inherently limited, then
6922 -- the target is adjusted after the copy and attached to the
6923 -- finalization list. However, no adjustment is done in the case
6924 -- where the object was initialized by a call to a function whose
6925 -- result is built in place, since no copy occurred. Similarly, no
6926 -- adjustment is required if we are going to rewrite the object
6927 -- declaration into a renaming declaration.
6929 if Needs_Finalization
(Typ
)
6930 and then not Is_Limited_View
(Typ
)
6931 and then not Rewrite_As_Renaming
6935 Obj_Ref
=> New_Occurrence_Of
(Def_Id
, Loc
),
6938 -- Guard against a missing [Deep_]Adjust when the base type
6939 -- was not properly frozen.
6941 if Present
(Adj_Call
) then
6942 Insert_Action_After
(Init_After
, Adj_Call
);
6946 -- For tagged types, when an init value is given, the tag has to
6947 -- be re-initialized separately in order to avoid the propagation
6948 -- of a wrong tag coming from a view conversion unless the type
6949 -- is class wide (in this case the tag comes from the init value).
6950 -- Suppress the tag assignment when not Tagged_Type_Expansion
6951 -- because tags are represented implicitly in objects. Ditto for
6952 -- types that are CPP_CLASS, and for initializations that are
6953 -- aggregates, because they have to have the right tag.
6955 -- The re-assignment of the tag has to be done even if the object
6956 -- is a constant. The assignment must be analyzed after the
6957 -- declaration. If an address clause follows, this is handled as
6958 -- part of the freeze actions for the object, otherwise insert
6959 -- tag assignment here.
6961 Tag_Assign
:= Make_Tag_Assignment
(N
);
6963 if Present
(Tag_Assign
) then
6964 if Present
(Following_Address_Clause
(N
)) then
6965 Ensure_Freeze_Node
(Def_Id
);
6968 Insert_Action_After
(Init_After
, Tag_Assign
);
6971 -- Handle C++ constructor calls. Note that we do not check that
6972 -- Typ is a tagged type since the equivalent Ada type of a C++
6973 -- class that has no virtual methods is an untagged limited
6976 elsif Is_CPP_Constructor_Call
(Expr
) then
6978 -- The call to the initialization procedure does NOT freeze the
6979 -- object being initialized.
6981 Id_Ref
:= New_Occurrence_Of
(Def_Id
, Loc
);
6982 Set_Must_Not_Freeze
(Id_Ref
);
6983 Set_Assignment_OK
(Id_Ref
);
6985 Insert_Actions_After
(Init_After
,
6986 Build_Initialization_Call
(Loc
, Id_Ref
, Typ
,
6987 Constructor_Ref
=> Expr
));
6989 -- We remove here the original call to the constructor
6990 -- to avoid its management in the backend
6992 Set_Expression
(N
, Empty
);
6995 -- Handle initialization of limited tagged types
6997 elsif Is_Tagged_Type
(Typ
)
6998 and then Is_Class_Wide_Type
(Typ
)
6999 and then Is_Limited_Record
(Typ
)
7000 and then not Is_Limited_Interface
(Typ
)
7002 -- Given that the type is limited we cannot perform a copy. If
7003 -- Expr_Q is the reference to a variable we mark the variable
7004 -- as OK_To_Rename to expand this declaration into a renaming
7005 -- declaration (see bellow).
7007 if Is_Entity_Name
(Expr_Q
) then
7008 Set_OK_To_Rename
(Entity
(Expr_Q
));
7010 -- If we cannot convert the expression into a renaming we must
7011 -- consider it an internal error because the backend does not
7012 -- have support to handle it. Also, when a raise expression is
7013 -- encountered we ignore it since it doesn't return a value and
7014 -- thus cannot trigger a copy.
7016 elsif Nkind
(Original_Node
(Expr_Q
)) /= N_Raise_Expression
then
7017 pragma Assert
(False);
7018 raise Program_Error
;
7021 -- For discrete types, set the Is_Known_Valid flag if the
7022 -- initializing value is known to be valid. Only do this for
7023 -- source assignments, since otherwise we can end up turning
7024 -- on the known valid flag prematurely from inserted code.
7026 elsif Comes_From_Source
(N
)
7027 and then Is_Discrete_Type
(Typ
)
7028 and then Expr_Known_Valid
(Expr
)
7030 Set_Is_Known_Valid
(Def_Id
);
7032 elsif Is_Access_Type
(Typ
) then
7034 -- For access types set the Is_Known_Non_Null flag if the
7035 -- initializing value is known to be non-null. We can also set
7036 -- Can_Never_Be_Null if this is a constant.
7038 if Known_Non_Null
(Expr
) then
7039 Set_Is_Known_Non_Null
(Def_Id
, True);
7041 if Constant_Present
(N
) then
7042 Set_Can_Never_Be_Null
(Def_Id
);
7047 -- If validity checking on copies, validate initial expression.
7048 -- But skip this if declaration is for a generic type, since it
7049 -- makes no sense to validate generic types. Not clear if this
7050 -- can happen for legal programs, but it definitely can arise
7051 -- from previous instantiation errors.
7053 if Validity_Checks_On
7054 and then Comes_From_Source
(N
)
7055 and then Validity_Check_Copies
7056 and then not Is_Generic_Type
(Etype
(Def_Id
))
7058 Ensure_Valid
(Expr
);
7059 Set_Is_Known_Valid
(Def_Id
);
7063 -- Cases where the back end cannot handle the initialization
7064 -- directly. In such cases, we expand an assignment that will
7065 -- be appropriately handled by Expand_N_Assignment_Statement.
7067 -- The exclusion of the unconstrained case is wrong, but for now it
7068 -- is too much trouble ???
7070 if (Is_Possibly_Unaligned_Slice
(Expr
)
7071 or else (Is_Possibly_Unaligned_Object
(Expr
)
7072 and then not Represented_As_Scalar
(Etype
(Expr
))))
7073 and then not (Is_Array_Type
(Etype
(Expr
))
7074 and then not Is_Constrained
(Etype
(Expr
)))
7077 Stat
: constant Node_Id
:=
7078 Make_Assignment_Statement
(Loc
,
7079 Name
=> New_Occurrence_Of
(Def_Id
, Loc
),
7080 Expression
=> Relocate_Node
(Expr
));
7082 Set_Expression
(N
, Empty
);
7083 Set_No_Initialization
(N
);
7084 Set_Assignment_OK
(Name
(Stat
));
7085 Set_No_Ctrl_Actions
(Stat
);
7086 Insert_After_And_Analyze
(Init_After
, Stat
);
7091 if Nkind
(Obj_Def
) = N_Access_Definition
7092 and then not Is_Local_Anonymous_Access
(Etype
(Def_Id
))
7094 -- An Ada 2012 stand-alone object of an anonymous access type
7097 Loc
: constant Source_Ptr
:= Sloc
(N
);
7099 Level
: constant Entity_Id
:=
7100 Make_Defining_Identifier
(Sloc
(N
),
7102 New_External_Name
(Chars
(Def_Id
), Suffix
=> "L"));
7104 Level_Expr
: Node_Id
;
7105 Level_Decl
: Node_Id
;
7108 Set_Ekind
(Level
, Ekind
(Def_Id
));
7109 Set_Etype
(Level
, Standard_Natural
);
7110 Set_Scope
(Level
, Scope
(Def_Id
));
7114 -- Set accessibility level of null
7117 Make_Integer_Literal
(Loc
, Scope_Depth
(Standard_Standard
));
7120 Level_Expr
:= Dynamic_Accessibility_Level
(Expr
);
7124 Make_Object_Declaration
(Loc
,
7125 Defining_Identifier
=> Level
,
7126 Object_Definition
=>
7127 New_Occurrence_Of
(Standard_Natural
, Loc
),
7128 Expression
=> Level_Expr
,
7129 Constant_Present
=> Constant_Present
(N
),
7130 Has_Init_Expression
=> True);
7132 Insert_Action_After
(Init_After
, Level_Decl
);
7134 Set_Extra_Accessibility
(Def_Id
, Level
);
7138 -- If the object is default initialized and its type is subject to
7139 -- pragma Default_Initial_Condition, add a runtime check to verify
7140 -- the assumption of the pragma (SPARK RM 7.3.3). Generate:
7142 -- <Base_Typ>DIC (<Base_Typ> (Def_Id));
7144 -- Note that the check is generated for source objects only
7146 if Comes_From_Source
(Def_Id
)
7147 and then Has_DIC
(Typ
)
7148 and then Present
(DIC_Procedure
(Typ
))
7149 and then not Has_Init_Expression
(N
)
7152 DIC_Call
: constant Node_Id
:= Build_DIC_Call
(Loc
, Def_Id
, Typ
);
7155 if Present
(Next_N
) then
7156 Insert_Before_And_Analyze
(Next_N
, DIC_Call
);
7158 -- The object declaration is the last node in a declarative or a
7162 Append_To
(List_Containing
(N
), DIC_Call
);
7168 -- Final transformation - turn the object declaration into a renaming
7169 -- if appropriate. If this is the completion of a deferred constant
7170 -- declaration, then this transformation generates what would be
7171 -- illegal code if written by hand, but that's OK.
7173 if Present
(Expr
) then
7174 if Rewrite_As_Renaming
then
7176 Make_Object_Renaming_Declaration
(Loc
,
7177 Defining_Identifier
=> Defining_Identifier
(N
),
7178 Subtype_Mark
=> Obj_Def
,
7181 -- We do not analyze this renaming declaration, because all its
7182 -- components have already been analyzed, and if we were to go
7183 -- ahead and analyze it, we would in effect be trying to generate
7184 -- another declaration of X, which won't do.
7186 Set_Renamed_Object
(Defining_Identifier
(N
), Expr_Q
);
7189 -- We do need to deal with debug issues for this renaming
7191 -- First, if entity comes from source, then mark it as needing
7192 -- debug information, even though it is defined by a generated
7193 -- renaming that does not come from source.
7195 if Comes_From_Source
(Defining_Identifier
(N
)) then
7196 Set_Debug_Info_Needed
(Defining_Identifier
(N
));
7199 -- Now call the routine to generate debug info for the renaming
7202 Decl
: constant Node_Id
:= Debug_Renaming_Declaration
(N
);
7204 if Present
(Decl
) then
7205 Insert_Action
(N
, Decl
);
7211 -- Exception on library entity not available
7214 when RE_Not_Available
=>
7216 end Expand_N_Object_Declaration
;
7218 ---------------------------------
7219 -- Expand_N_Subtype_Indication --
7220 ---------------------------------
7222 -- Add a check on the range of the subtype. The static case is partially
7223 -- duplicated by Process_Range_Expr_In_Decl in Sem_Ch3, but we still need
7224 -- to check here for the static case in order to avoid generating
7225 -- extraneous expanded code. Also deal with validity checking.
7227 procedure Expand_N_Subtype_Indication
(N
: Node_Id
) is
7228 Ran
: constant Node_Id
:= Range_Expression
(Constraint
(N
));
7229 Typ
: constant Entity_Id
:= Entity
(Subtype_Mark
(N
));
7232 if Nkind
(Constraint
(N
)) = N_Range_Constraint
then
7233 Validity_Check_Range
(Range_Expression
(Constraint
(N
)));
7236 if Nkind_In
(Parent
(N
), N_Constrained_Array_Definition
, N_Slice
) then
7237 Apply_Range_Check
(Ran
, Typ
);
7239 end Expand_N_Subtype_Indication
;
7241 ---------------------------
7242 -- Expand_N_Variant_Part --
7243 ---------------------------
7245 -- Note: this procedure no longer has any effect. It used to be that we
7246 -- would replace the choices in the last variant by a when others, and
7247 -- also expanded static predicates in variant choices here, but both of
7248 -- those activities were being done too early, since we can't check the
7249 -- choices until the statically predicated subtypes are frozen, which can
7250 -- happen as late as the free point of the record, and we can't change the
7251 -- last choice to an others before checking the choices, which is now done
7252 -- at the freeze point of the record.
7254 procedure Expand_N_Variant_Part
(N
: Node_Id
) is
7257 end Expand_N_Variant_Part
;
7259 ---------------------------------
7260 -- Expand_Previous_Access_Type --
7261 ---------------------------------
7263 procedure Expand_Previous_Access_Type
(Def_Id
: Entity_Id
) is
7264 Ptr_Typ
: Entity_Id
;
7267 -- Find all access types in the current scope whose designated type is
7268 -- Def_Id and build master renamings for them.
7270 Ptr_Typ
:= First_Entity
(Current_Scope
);
7271 while Present
(Ptr_Typ
) loop
7272 if Is_Access_Type
(Ptr_Typ
)
7273 and then Designated_Type
(Ptr_Typ
) = Def_Id
7274 and then No
(Master_Id
(Ptr_Typ
))
7276 -- Ensure that the designated type has a master
7278 Build_Master_Entity
(Def_Id
);
7280 -- Private and incomplete types complicate the insertion of master
7281 -- renamings because the access type may precede the full view of
7282 -- the designated type. For this reason, the master renamings are
7283 -- inserted relative to the designated type.
7285 Build_Master_Renaming
(Ptr_Typ
, Ins_Nod
=> Parent
(Def_Id
));
7288 Next_Entity
(Ptr_Typ
);
7290 end Expand_Previous_Access_Type
;
7292 -----------------------------
7293 -- Expand_Record_Extension --
7294 -----------------------------
7296 -- Add a field _parent at the beginning of the record extension. This is
7297 -- used to implement inheritance. Here are some examples of expansion:
7299 -- 1. no discriminants
7300 -- type T2 is new T1 with null record;
7302 -- type T2 is new T1 with record
7306 -- 2. renamed discriminants
7307 -- type T2 (B, C : Int) is new T1 (A => B) with record
7308 -- _Parent : T1 (A => B);
7312 -- 3. inherited discriminants
7313 -- type T2 is new T1 with record -- discriminant A inherited
7314 -- _Parent : T1 (A);
7318 procedure Expand_Record_Extension
(T
: Entity_Id
; Def
: Node_Id
) is
7319 Indic
: constant Node_Id
:= Subtype_Indication
(Def
);
7320 Loc
: constant Source_Ptr
:= Sloc
(Def
);
7321 Rec_Ext_Part
: Node_Id
:= Record_Extension_Part
(Def
);
7322 Par_Subtype
: Entity_Id
;
7323 Comp_List
: Node_Id
;
7324 Comp_Decl
: Node_Id
;
7327 List_Constr
: constant List_Id
:= New_List
;
7330 -- Expand_Record_Extension is called directly from the semantics, so
7331 -- we must check to see whether expansion is active before proceeding,
7332 -- because this affects the visibility of selected components in bodies
7335 if not Expander_Active
then
7339 -- This may be a derivation of an untagged private type whose full
7340 -- view is tagged, in which case the Derived_Type_Definition has no
7341 -- extension part. Build an empty one now.
7343 if No
(Rec_Ext_Part
) then
7345 Make_Record_Definition
(Loc
,
7347 Component_List
=> Empty
,
7348 Null_Present
=> True);
7350 Set_Record_Extension_Part
(Def
, Rec_Ext_Part
);
7351 Mark_Rewrite_Insertion
(Rec_Ext_Part
);
7354 Comp_List
:= Component_List
(Rec_Ext_Part
);
7356 Parent_N
:= Make_Defining_Identifier
(Loc
, Name_uParent
);
7358 -- If the derived type inherits its discriminants the type of the
7359 -- _parent field must be constrained by the inherited discriminants
7361 if Has_Discriminants
(T
)
7362 and then Nkind
(Indic
) /= N_Subtype_Indication
7363 and then not Is_Constrained
(Entity
(Indic
))
7365 D
:= First_Discriminant
(T
);
7366 while Present
(D
) loop
7367 Append_To
(List_Constr
, New_Occurrence_Of
(D
, Loc
));
7368 Next_Discriminant
(D
);
7373 Make_Subtype_Indication
(Loc
,
7374 Subtype_Mark
=> New_Occurrence_Of
(Entity
(Indic
), Loc
),
7376 Make_Index_Or_Discriminant_Constraint
(Loc
,
7377 Constraints
=> List_Constr
)),
7380 -- Otherwise the original subtype_indication is just what is needed
7383 Par_Subtype
:= Process_Subtype
(New_Copy_Tree
(Indic
), Def
);
7386 Set_Parent_Subtype
(T
, Par_Subtype
);
7389 Make_Component_Declaration
(Loc
,
7390 Defining_Identifier
=> Parent_N
,
7391 Component_Definition
=>
7392 Make_Component_Definition
(Loc
,
7393 Aliased_Present
=> False,
7394 Subtype_Indication
=> New_Occurrence_Of
(Par_Subtype
, Loc
)));
7396 if Null_Present
(Rec_Ext_Part
) then
7397 Set_Component_List
(Rec_Ext_Part
,
7398 Make_Component_List
(Loc
,
7399 Component_Items
=> New_List
(Comp_Decl
),
7400 Variant_Part
=> Empty
,
7401 Null_Present
=> False));
7402 Set_Null_Present
(Rec_Ext_Part
, False);
7404 elsif Null_Present
(Comp_List
)
7405 or else Is_Empty_List
(Component_Items
(Comp_List
))
7407 Set_Component_Items
(Comp_List
, New_List
(Comp_Decl
));
7408 Set_Null_Present
(Comp_List
, False);
7411 Insert_Before
(First
(Component_Items
(Comp_List
)), Comp_Decl
);
7414 Analyze
(Comp_Decl
);
7415 end Expand_Record_Extension
;
7417 ------------------------
7418 -- Expand_Tagged_Root --
7419 ------------------------
7421 procedure Expand_Tagged_Root
(T
: Entity_Id
) is
7422 Def
: constant Node_Id
:= Type_Definition
(Parent
(T
));
7423 Comp_List
: Node_Id
;
7424 Comp_Decl
: Node_Id
;
7425 Sloc_N
: Source_Ptr
;
7428 if Null_Present
(Def
) then
7429 Set_Component_List
(Def
,
7430 Make_Component_List
(Sloc
(Def
),
7431 Component_Items
=> Empty_List
,
7432 Variant_Part
=> Empty
,
7433 Null_Present
=> True));
7436 Comp_List
:= Component_List
(Def
);
7438 if Null_Present
(Comp_List
)
7439 or else Is_Empty_List
(Component_Items
(Comp_List
))
7441 Sloc_N
:= Sloc
(Comp_List
);
7443 Sloc_N
:= Sloc
(First
(Component_Items
(Comp_List
)));
7447 Make_Component_Declaration
(Sloc_N
,
7448 Defining_Identifier
=> First_Tag_Component
(T
),
7449 Component_Definition
=>
7450 Make_Component_Definition
(Sloc_N
,
7451 Aliased_Present
=> False,
7452 Subtype_Indication
=> New_Occurrence_Of
(RTE
(RE_Tag
), Sloc_N
)));
7454 if Null_Present
(Comp_List
)
7455 or else Is_Empty_List
(Component_Items
(Comp_List
))
7457 Set_Component_Items
(Comp_List
, New_List
(Comp_Decl
));
7458 Set_Null_Present
(Comp_List
, False);
7461 Insert_Before
(First
(Component_Items
(Comp_List
)), Comp_Decl
);
7464 -- We don't Analyze the whole expansion because the tag component has
7465 -- already been analyzed previously. Here we just insure that the tree
7466 -- is coherent with the semantic decoration
7468 Find_Type
(Subtype_Indication
(Component_Definition
(Comp_Decl
)));
7471 when RE_Not_Available
=>
7473 end Expand_Tagged_Root
;
7475 ------------------------------
7476 -- Freeze_Stream_Operations --
7477 ------------------------------
7479 procedure Freeze_Stream_Operations
(N
: Node_Id
; Typ
: Entity_Id
) is
7480 Names
: constant array (1 .. 4) of TSS_Name_Type
:=
7485 Stream_Op
: Entity_Id
;
7488 -- Primitive operations of tagged types are frozen when the dispatch
7489 -- table is constructed.
7491 if not Comes_From_Source
(Typ
) or else Is_Tagged_Type
(Typ
) then
7495 for J
in Names
'Range loop
7496 Stream_Op
:= TSS
(Typ
, Names
(J
));
7498 if Present
(Stream_Op
)
7499 and then Is_Subprogram
(Stream_Op
)
7500 and then Nkind
(Unit_Declaration_Node
(Stream_Op
)) =
7501 N_Subprogram_Declaration
7502 and then not Is_Frozen
(Stream_Op
)
7504 Append_Freeze_Actions
(Typ
, Freeze_Entity
(Stream_Op
, N
));
7507 end Freeze_Stream_Operations
;
7513 -- Full type declarations are expanded at the point at which the type is
7514 -- frozen. The formal N is the Freeze_Node for the type. Any statements or
7515 -- declarations generated by the freezing (e.g. the procedure generated
7516 -- for initialization) are chained in the Actions field list of the freeze
7517 -- node using Append_Freeze_Actions.
7519 -- WARNING: This routine manages Ghost regions. Return statements must be
7520 -- replaced by gotos which jump to the end of the routine and restore the
7523 function Freeze_Type
(N
: Node_Id
) return Boolean is
7524 procedure Process_RACW_Types
(Typ
: Entity_Id
);
7525 -- Validate and generate stubs for all RACW types associated with type
7528 procedure Process_Pending_Access_Types
(Typ
: Entity_Id
);
7529 -- Associate type Typ's Finalize_Address primitive with the finalization
7530 -- masters of pending access-to-Typ types.
7532 ------------------------
7533 -- Process_RACW_Types --
7534 ------------------------
7536 procedure Process_RACW_Types
(Typ
: Entity_Id
) is
7537 List
: constant Elist_Id
:= Access_Types_To_Process
(N
);
7539 Seen
: Boolean := False;
7542 if Present
(List
) then
7543 E
:= First_Elmt
(List
);
7544 while Present
(E
) loop
7545 if Is_Remote_Access_To_Class_Wide_Type
(Node
(E
)) then
7546 Validate_RACW_Primitives
(Node
(E
));
7554 -- If there are RACWs designating this type, make stubs now
7557 Remote_Types_Tagged_Full_View_Encountered
(Typ
);
7559 end Process_RACW_Types
;
7561 ----------------------------------
7562 -- Process_Pending_Access_Types --
7563 ----------------------------------
7565 procedure Process_Pending_Access_Types
(Typ
: Entity_Id
) is
7569 -- Finalize_Address is not generated in CodePeer mode because the
7570 -- body contains address arithmetic. This processing is disabled.
7572 if CodePeer_Mode
then
7575 -- Certain itypes are generated for contexts that cannot allocate
7576 -- objects and should not set primitive Finalize_Address.
7578 elsif Is_Itype
(Typ
)
7579 and then Nkind
(Associated_Node_For_Itype
(Typ
)) =
7580 N_Explicit_Dereference
7584 -- When an access type is declared after the incomplete view of a
7585 -- Taft-amendment type, the access type is considered pending in
7586 -- case the full view of the Taft-amendment type is controlled. If
7587 -- this is indeed the case, associate the Finalize_Address routine
7588 -- of the full view with the finalization masters of all pending
7589 -- access types. This scenario applies to anonymous access types as
7592 elsif Needs_Finalization
(Typ
)
7593 and then Present
(Pending_Access_Types
(Typ
))
7595 E
:= First_Elmt
(Pending_Access_Types
(Typ
));
7596 while Present
(E
) loop
7599 -- Set_Finalize_Address
7600 -- (Ptr_Typ, <Typ>FD'Unrestricted_Access);
7602 Append_Freeze_Action
(Typ
,
7603 Make_Set_Finalize_Address_Call
7605 Ptr_Typ
=> Node
(E
)));
7610 end Process_Pending_Access_Types
;
7614 Def_Id
: constant Entity_Id
:= Entity
(N
);
7616 Saved_GM
: constant Ghost_Mode_Type
:= Ghost_Mode
;
7617 Saved_IGR
: constant Node_Id
:= Ignored_Ghost_Region
;
7618 -- Save the Ghost-related attributes to restore on exit
7620 Result
: Boolean := False;
7622 -- Start of processing for Freeze_Type
7625 -- The type being frozen may be subject to pragma Ghost. Set the mode
7626 -- now to ensure that any nodes generated during freezing are properly
7629 Set_Ghost_Mode
(Def_Id
);
7631 -- Process any remote access-to-class-wide types designating the type
7634 Process_RACW_Types
(Def_Id
);
7636 -- Freeze processing for record types
7638 if Is_Record_Type
(Def_Id
) then
7639 if Ekind
(Def_Id
) = E_Record_Type
then
7640 Expand_Freeze_Record_Type
(N
);
7641 elsif Is_Class_Wide_Type
(Def_Id
) then
7642 Expand_Freeze_Class_Wide_Type
(N
);
7645 -- Freeze processing for array types
7647 elsif Is_Array_Type
(Def_Id
) then
7648 Expand_Freeze_Array_Type
(N
);
7650 -- Freeze processing for access types
7652 -- For pool-specific access types, find out the pool object used for
7653 -- this type, needs actual expansion of it in some cases. Here are the
7654 -- different cases :
7656 -- 1. Rep Clause "for Def_Id'Storage_Size use 0;"
7657 -- ---> don't use any storage pool
7659 -- 2. Rep Clause : for Def_Id'Storage_Size use Expr.
7661 -- Def_Id__Pool : Stack_Bounded_Pool (Expr, DT'Size, DT'Alignment);
7663 -- 3. Rep Clause "for Def_Id'Storage_Pool use a_Pool_Object"
7664 -- ---> Storage Pool is the specified one
7666 -- See GNAT Pool packages in the Run-Time for more details
7668 elsif Ekind_In
(Def_Id
, E_Access_Type
, E_General_Access_Type
) then
7670 Loc
: constant Source_Ptr
:= Sloc
(N
);
7671 Desig_Type
: constant Entity_Id
:= Designated_Type
(Def_Id
);
7673 Freeze_Action_Typ
: Entity_Id
;
7674 Pool_Object
: Entity_Id
;
7679 -- Rep Clause "for Def_Id'Storage_Size use 0;"
7680 -- ---> don't use any storage pool
7682 if No_Pool_Assigned
(Def_Id
) then
7687 -- Rep Clause : for Def_Id'Storage_Size use Expr.
7689 -- Def_Id__Pool : Stack_Bounded_Pool
7690 -- (Expr, DT'Size, DT'Alignment);
7692 elsif Has_Storage_Size_Clause
(Def_Id
) then
7698 -- For unconstrained composite types we give a size of zero
7699 -- so that the pool knows that it needs a special algorithm
7700 -- for variable size object allocation.
7702 if Is_Composite_Type
(Desig_Type
)
7703 and then not Is_Constrained
(Desig_Type
)
7705 DT_Size
:= Make_Integer_Literal
(Loc
, 0);
7706 DT_Align
:= Make_Integer_Literal
(Loc
, Maximum_Alignment
);
7710 Make_Attribute_Reference
(Loc
,
7711 Prefix
=> New_Occurrence_Of
(Desig_Type
, Loc
),
7712 Attribute_Name
=> Name_Max_Size_In_Storage_Elements
);
7715 Make_Attribute_Reference
(Loc
,
7716 Prefix
=> New_Occurrence_Of
(Desig_Type
, Loc
),
7717 Attribute_Name
=> Name_Alignment
);
7721 Make_Defining_Identifier
(Loc
,
7722 Chars
=> New_External_Name
(Chars
(Def_Id
), 'P'));
7724 -- We put the code associated with the pools in the entity
7725 -- that has the later freeze node, usually the access type
7726 -- but it can also be the designated_type; because the pool
7727 -- code requires both those types to be frozen
7729 if Is_Frozen
(Desig_Type
)
7730 and then (No
(Freeze_Node
(Desig_Type
))
7731 or else Analyzed
(Freeze_Node
(Desig_Type
)))
7733 Freeze_Action_Typ
:= Def_Id
;
7735 -- A Taft amendment type cannot get the freeze actions
7736 -- since the full view is not there.
7738 elsif Is_Incomplete_Or_Private_Type
(Desig_Type
)
7739 and then No
(Full_View
(Desig_Type
))
7741 Freeze_Action_Typ
:= Def_Id
;
7744 Freeze_Action_Typ
:= Desig_Type
;
7747 Append_Freeze_Action
(Freeze_Action_Typ
,
7748 Make_Object_Declaration
(Loc
,
7749 Defining_Identifier
=> Pool_Object
,
7750 Object_Definition
=>
7751 Make_Subtype_Indication
(Loc
,
7754 (RTE
(RE_Stack_Bounded_Pool
), Loc
),
7757 Make_Index_Or_Discriminant_Constraint
(Loc
,
7758 Constraints
=> New_List
(
7760 -- First discriminant is the Pool Size
7763 Storage_Size_Variable
(Def_Id
), Loc
),
7765 -- Second discriminant is the element size
7769 -- Third discriminant is the alignment
7774 Set_Associated_Storage_Pool
(Def_Id
, Pool_Object
);
7778 -- Rep Clause "for Def_Id'Storage_Pool use a_Pool_Object"
7779 -- ---> Storage Pool is the specified one
7781 -- When compiling in Ada 2012 mode, ensure that the accessibility
7782 -- level of the subpool access type is not deeper than that of the
7783 -- pool_with_subpools.
7785 elsif Ada_Version
>= Ada_2012
7786 and then Present
(Associated_Storage_Pool
(Def_Id
))
7788 -- Omit this check for the case of a configurable run-time that
7789 -- does not provide package System.Storage_Pools.Subpools.
7791 and then RTE_Available
(RE_Root_Storage_Pool_With_Subpools
)
7794 Loc
: constant Source_Ptr
:= Sloc
(Def_Id
);
7795 Pool
: constant Entity_Id
:=
7796 Associated_Storage_Pool
(Def_Id
);
7797 RSPWS
: constant Entity_Id
:=
7798 RTE
(RE_Root_Storage_Pool_With_Subpools
);
7801 -- It is known that the accessibility level of the access
7802 -- type is deeper than that of the pool.
7804 if Type_Access_Level
(Def_Id
) > Object_Access_Level
(Pool
)
7805 and then not Accessibility_Checks_Suppressed
(Def_Id
)
7806 and then not Accessibility_Checks_Suppressed
(Pool
)
7808 -- Static case: the pool is known to be a descendant of
7809 -- Root_Storage_Pool_With_Subpools.
7811 if Is_Ancestor
(RSPWS
, Etype
(Pool
)) then
7813 ("??subpool access type has deeper accessibility "
7814 & "level than pool", Def_Id
);
7816 Append_Freeze_Action
(Def_Id
,
7817 Make_Raise_Program_Error
(Loc
,
7818 Reason
=> PE_Accessibility_Check_Failed
));
7820 -- Dynamic case: when the pool is of a class-wide type,
7821 -- it may or may not support subpools depending on the
7822 -- path of derivation. Generate:
7824 -- if Def_Id in RSPWS'Class then
7825 -- raise Program_Error;
7828 elsif Is_Class_Wide_Type
(Etype
(Pool
)) then
7829 Append_Freeze_Action
(Def_Id
,
7830 Make_If_Statement
(Loc
,
7833 Left_Opnd
=> New_Occurrence_Of
(Pool
, Loc
),
7836 (Class_Wide_Type
(RSPWS
), Loc
)),
7838 Then_Statements
=> New_List
(
7839 Make_Raise_Program_Error
(Loc
,
7840 Reason
=> PE_Accessibility_Check_Failed
))));
7846 -- For access-to-controlled types (including class-wide types and
7847 -- Taft-amendment types, which potentially have controlled
7848 -- components), expand the list controller object that will store
7849 -- the dynamically allocated objects. Don't do this transformation
7850 -- for expander-generated access types, but do it for types that
7851 -- are the full view of types derived from other private types.
7852 -- Also suppress the list controller in the case of a designated
7853 -- type with convention Java, since this is used when binding to
7854 -- Java API specs, where there's no equivalent of a finalization
7855 -- list and we don't want to pull in the finalization support if
7858 if not Comes_From_Source
(Def_Id
)
7859 and then not Has_Private_Declaration
(Def_Id
)
7863 -- An exception is made for types defined in the run-time because
7864 -- Ada.Tags.Tag itself is such a type and cannot afford this
7865 -- unnecessary overhead that would generates a loop in the
7866 -- expansion scheme. Another exception is if Restrictions
7867 -- (No_Finalization) is active, since then we know nothing is
7870 elsif Restriction_Active
(No_Finalization
)
7871 or else In_Runtime
(Def_Id
)
7875 -- Create a finalization master for an access-to-controlled type
7876 -- or an access-to-incomplete type. It is assumed that the full
7877 -- view will be controlled.
7879 elsif Needs_Finalization
(Desig_Type
)
7880 or else (Is_Incomplete_Type
(Desig_Type
)
7881 and then No
(Full_View
(Desig_Type
)))
7883 Build_Finalization_Master
(Def_Id
);
7885 -- Create a finalization master when the designated type contains
7886 -- a private component. It is assumed that the full view will be
7889 elsif Has_Private_Component
(Desig_Type
) then
7890 Build_Finalization_Master
7892 For_Private
=> True,
7893 Context_Scope
=> Scope
(Def_Id
),
7894 Insertion_Node
=> Declaration_Node
(Desig_Type
));
7898 -- Freeze processing for enumeration types
7900 elsif Ekind
(Def_Id
) = E_Enumeration_Type
then
7902 -- We only have something to do if we have a non-standard
7903 -- representation (i.e. at least one literal whose pos value
7904 -- is not the same as its representation)
7906 if Has_Non_Standard_Rep
(Def_Id
) then
7907 Expand_Freeze_Enumeration_Type
(N
);
7910 -- Private types that are completed by a derivation from a private
7911 -- type have an internally generated full view, that needs to be
7912 -- frozen. This must be done explicitly because the two views share
7913 -- the freeze node, and the underlying full view is not visible when
7914 -- the freeze node is analyzed.
7916 elsif Is_Private_Type
(Def_Id
)
7917 and then Is_Derived_Type
(Def_Id
)
7918 and then Present
(Full_View
(Def_Id
))
7919 and then Is_Itype
(Full_View
(Def_Id
))
7920 and then Has_Private_Declaration
(Full_View
(Def_Id
))
7921 and then Freeze_Node
(Full_View
(Def_Id
)) = N
7923 Set_Entity
(N
, Full_View
(Def_Id
));
7924 Result
:= Freeze_Type
(N
);
7925 Set_Entity
(N
, Def_Id
);
7927 -- All other types require no expander action. There are such cases
7928 -- (e.g. task types and protected types). In such cases, the freeze
7929 -- nodes are there for use by Gigi.
7933 -- Complete the initialization of all pending access types' finalization
7934 -- masters now that the designated type has been is frozen and primitive
7935 -- Finalize_Address generated.
7937 Process_Pending_Access_Types
(Def_Id
);
7938 Freeze_Stream_Operations
(N
, Def_Id
);
7940 -- Generate the [spec and] body of the procedure tasked with the runtime
7941 -- verification of pragma Default_Initial_Condition's expression.
7943 if Has_DIC
(Def_Id
) then
7944 Build_DIC_Procedure_Body
(Def_Id
, For_Freeze
=> True);
7947 -- Generate the [spec and] body of the invariant procedure tasked with
7948 -- the runtime verification of all invariants that pertain to the type.
7949 -- This includes invariants on the partial and full view, inherited
7950 -- class-wide invariants from parent types or interfaces, and invariants
7951 -- on array elements or record components.
7953 if Is_Interface
(Def_Id
) then
7955 -- Interfaces are treated as the partial view of a private type in
7956 -- order to achieve uniformity with the general case. As a result, an
7957 -- interface receives only a "partial" invariant procedure which is
7960 if Has_Own_Invariants
(Def_Id
) then
7961 Build_Invariant_Procedure_Body
7963 Partial_Invariant
=> Is_Interface
(Def_Id
));
7966 -- Non-interface types
7968 -- Do not generate invariant procedure within other assertion
7969 -- subprograms, which may involve local declarations of local
7970 -- subtypes to which these checks do not apply.
7972 elsif Has_Invariants
(Def_Id
) then
7973 if Within_Internal_Subprogram
7974 or else (Ekind
(Current_Scope
) = E_Function
7975 and then Is_Predicate_Function
(Current_Scope
))
7979 Build_Invariant_Procedure_Body
(Def_Id
);
7983 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
7988 when RE_Not_Available
=>
7989 Restore_Ghost_Region
(Saved_GM
, Saved_IGR
);
7994 -------------------------
7995 -- Get_Simple_Init_Val --
7996 -------------------------
7998 function Get_Simple_Init_Val
8001 Size
: Uint
:= No_Uint
) return Node_Id
8003 IV_Attribute
: constant Boolean :=
8004 Nkind
(N
) = N_Attribute_Reference
8005 and then Attribute_Name
(N
) = Name_Invalid_Value
;
8007 Loc
: constant Source_Ptr
:= Sloc
(N
);
8009 procedure Extract_Subtype_Bounds
8010 (Lo_Bound
: out Uint
;
8011 Hi_Bound
: out Uint
);
8012 -- Inspect subtype Typ as well its ancestor subtypes and derived types
8013 -- to determine the best known information about the bounds of the type.
8014 -- The output parameters are set as follows:
8016 -- * Lo_Bound - Set to No_Unit when there is no information available,
8017 -- or to the known low bound.
8019 -- * Hi_Bound - Set to No_Unit when there is no information available,
8020 -- or to the known high bound.
8022 function Simple_Init_Array_Type
return Node_Id
;
8023 -- Build an expression to initialize array type Typ
8025 function Simple_Init_Defaulted_Type
return Node_Id
;
8026 -- Build an expression to initialize type Typ which is subject to
8027 -- aspect Default_Value.
8029 function Simple_Init_Initialize_Scalars_Type
8030 (Size_To_Use
: Uint
) return Node_Id
;
8031 -- Build an expression to initialize scalar type Typ which is subject to
8032 -- pragma Initialize_Scalars. Size_To_Use is the size of the object.
8034 function Simple_Init_Normalize_Scalars_Type
8035 (Size_To_Use
: Uint
) return Node_Id
;
8036 -- Build an expression to initialize scalar type Typ which is subject to
8037 -- pragma Normalize_Scalars. Size_To_Use is the size of the object.
8039 function Simple_Init_Private_Type
return Node_Id
;
8040 -- Build an expression to initialize private type Typ
8042 function Simple_Init_Scalar_Type
return Node_Id
;
8043 -- Build an expression to initialize scalar type Typ
8045 ----------------------------
8046 -- Extract_Subtype_Bounds --
8047 ----------------------------
8049 procedure Extract_Subtype_Bounds
8050 (Lo_Bound
: out Uint
;
8051 Hi_Bound
: out Uint
)
8061 Lo_Bound
:= No_Uint
;
8062 Hi_Bound
:= No_Uint
;
8064 -- Loop to climb ancestor subtypes and derived types
8068 if not Is_Discrete_Type
(ST1
) then
8072 Lo
:= Type_Low_Bound
(ST1
);
8073 Hi
:= Type_High_Bound
(ST1
);
8075 if Compile_Time_Known_Value
(Lo
) then
8076 Lo_Val
:= Expr_Value
(Lo
);
8078 if Lo_Bound
= No_Uint
or else Lo_Bound
< Lo_Val
then
8083 if Compile_Time_Known_Value
(Hi
) then
8084 Hi_Val
:= Expr_Value
(Hi
);
8086 if Hi_Bound
= No_Uint
or else Hi_Bound
> Hi_Val
then
8091 ST2
:= Ancestor_Subtype
(ST1
);
8097 exit when ST1
= ST2
;
8100 end Extract_Subtype_Bounds
;
8102 ----------------------------
8103 -- Simple_Init_Array_Type --
8104 ----------------------------
8106 function Simple_Init_Array_Type
return Node_Id
is
8107 Comp_Typ
: constant Entity_Id
:= Component_Type
(Typ
);
8109 function Simple_Init_Dimension
(Index
: Node_Id
) return Node_Id
;
8110 -- Initialize a single array dimension with index constraint Index
8112 --------------------
8113 -- Simple_Init_Dimension --
8114 --------------------
8116 function Simple_Init_Dimension
(Index
: Node_Id
) return Node_Id
is
8118 -- Process the current dimension
8120 if Present
(Index
) then
8122 -- Build a suitable "others" aggregate for the next dimension,
8123 -- or initialize the component itself. Generate:
8128 Make_Aggregate
(Loc
,
8129 Component_Associations
=> New_List
(
8130 Make_Component_Association
(Loc
,
8131 Choices
=> New_List
(Make_Others_Choice
(Loc
)),
8133 Simple_Init_Dimension
(Next_Index
(Index
)))));
8135 -- Otherwise all dimensions have been processed. Initialize the
8136 -- component itself.
8143 Size
=> Esize
(Comp_Typ
));
8145 end Simple_Init_Dimension
;
8147 -- Start of processing for Simple_Init_Array_Type
8150 return Simple_Init_Dimension
(First_Index
(Typ
));
8151 end Simple_Init_Array_Type
;
8153 --------------------------------
8154 -- Simple_Init_Defaulted_Type --
8155 --------------------------------
8157 function Simple_Init_Defaulted_Type
return Node_Id
is
8158 Subtyp
: constant Entity_Id
:= First_Subtype
(Typ
);
8161 -- Use the Sloc of the context node when constructing the initial
8162 -- value because the expression of Default_Value may come from a
8163 -- different unit. Updating the Sloc will result in accurate error
8166 -- When the first subtype is private, retrieve the expression of the
8167 -- Default_Value from the underlying type.
8169 if Is_Private_Type
(Subtyp
) then
8171 Unchecked_Convert_To
8175 (Source
=> Default_Aspect_Value
(Full_View
(Subtyp
)),
8184 (Source
=> Default_Aspect_Value
(Subtyp
),
8187 end Simple_Init_Defaulted_Type
;
8189 -----------------------------------------
8190 -- Simple_Init_Initialize_Scalars_Type --
8191 -----------------------------------------
8193 function Simple_Init_Initialize_Scalars_Type
8194 (Size_To_Use
: Uint
) return Node_Id
8196 Float_Typ
: Entity_Id
;
8199 Scal_Typ
: Scalar_Id
;
8202 Extract_Subtype_Bounds
(Lo_Bound
, Hi_Bound
);
8206 if Is_Floating_Point_Type
(Typ
) then
8207 Float_Typ
:= Root_Type
(Typ
);
8209 if Float_Typ
= Standard_Short_Float
then
8210 Scal_Typ
:= Name_Short_Float
;
8211 elsif Float_Typ
= Standard_Float
then
8212 Scal_Typ
:= Name_Float
;
8213 elsif Float_Typ
= Standard_Long_Float
then
8214 Scal_Typ
:= Name_Long_Float
;
8215 else pragma Assert
(Float_Typ
= Standard_Long_Long_Float
);
8216 Scal_Typ
:= Name_Long_Long_Float
;
8219 -- If zero is invalid, it is a convenient value to use that is for
8220 -- sure an appropriate invalid value in all situations.
8222 elsif Lo_Bound
/= No_Uint
and then Lo_Bound
> Uint_0
then
8223 return Make_Integer_Literal
(Loc
, 0);
8227 elsif Is_Unsigned_Type
(Typ
) then
8228 if Size_To_Use
<= 8 then
8229 Scal_Typ
:= Name_Unsigned_8
;
8230 elsif Size_To_Use
<= 16 then
8231 Scal_Typ
:= Name_Unsigned_16
;
8232 elsif Size_To_Use
<= 32 then
8233 Scal_Typ
:= Name_Unsigned_32
;
8235 Scal_Typ
:= Name_Unsigned_64
;
8241 if Size_To_Use
<= 8 then
8242 Scal_Typ
:= Name_Signed_8
;
8243 elsif Size_To_Use
<= 16 then
8244 Scal_Typ
:= Name_Signed_16
;
8245 elsif Size_To_Use
<= 32 then
8246 Scal_Typ
:= Name_Signed_32
;
8248 Scal_Typ
:= Name_Signed_64
;
8252 -- Use the values specified by pragma Initialize_Scalars or the ones
8253 -- provided by the binder. Higher precedence is given to the pragma.
8255 return Invalid_Scalar_Value
(Loc
, Scal_Typ
);
8256 end Simple_Init_Initialize_Scalars_Type
;
8258 ----------------------------------------
8259 -- Simple_Init_Normalize_Scalars_Type --
8260 ----------------------------------------
8262 function Simple_Init_Normalize_Scalars_Type
8263 (Size_To_Use
: Uint
) return Node_Id
8265 Signed_Size
: constant Uint
:= UI_Min
(Uint_63
, Size_To_Use
- 1);
8272 Extract_Subtype_Bounds
(Lo_Bound
, Hi_Bound
);
8274 -- If zero is invalid, it is a convenient value to use that is for
8275 -- sure an appropriate invalid value in all situations.
8277 if Lo_Bound
/= No_Uint
and then Lo_Bound
> Uint_0
then
8278 Expr
:= Make_Integer_Literal
(Loc
, 0);
8280 -- Cases where all one bits is the appropriate invalid value
8282 -- For modular types, all 1 bits is either invalid or valid. If it
8283 -- is valid, then there is nothing that can be done since there are
8284 -- no invalid values (we ruled out zero already).
8286 -- For signed integer types that have no negative values, either
8287 -- there is room for negative values, or there is not. If there
8288 -- is, then all 1-bits may be interpreted as minus one, which is
8289 -- certainly invalid. Alternatively it is treated as the largest
8290 -- positive value, in which case the observation for modular types
8293 -- For float types, all 1-bits is a NaN (not a number), which is
8294 -- certainly an appropriately invalid value.
8296 elsif Is_Enumeration_Type
(Typ
)
8297 or else Is_Floating_Point_Type
(Typ
)
8298 or else Is_Unsigned_Type
(Typ
)
8300 Expr
:= Make_Integer_Literal
(Loc
, 2 ** Size_To_Use
- 1);
8302 -- Resolve as Unsigned_64, because the largest number we can
8303 -- generate is out of range of universal integer.
8305 Analyze_And_Resolve
(Expr
, RTE
(RE_Unsigned_64
));
8307 -- Case of signed types
8310 -- Normally we like to use the most negative number. The one
8311 -- exception is when this number is in the known subtype range and
8312 -- the largest positive number is not in the known subtype range.
8314 -- For this exceptional case, use largest positive value
8316 if Lo_Bound
/= No_Uint
and then Hi_Bound
/= No_Uint
8317 and then Lo_Bound
<= (-(2 ** Signed_Size
))
8318 and then Hi_Bound
< 2 ** Signed_Size
8320 Expr
:= Make_Integer_Literal
(Loc
, 2 ** Signed_Size
- 1);
8322 -- Normal case of largest negative value
8325 Expr
:= Make_Integer_Literal
(Loc
, -(2 ** Signed_Size
));
8330 end Simple_Init_Normalize_Scalars_Type
;
8332 ------------------------------
8333 -- Simple_Init_Private_Type --
8334 ------------------------------
8336 function Simple_Init_Private_Type
return Node_Id
is
8337 Under_Typ
: constant Entity_Id
:= Underlying_Type
(Typ
);
8341 -- The availability of the underlying view must be checked by routine
8342 -- Needs_Simple_Initialization.
8344 pragma Assert
(Present
(Under_Typ
));
8346 Expr
:= Get_Simple_Init_Val
(Under_Typ
, N
, Size
);
8348 -- If the initial value is null or an aggregate, qualify it with the
8349 -- underlying type in order to provide a proper context.
8351 if Nkind_In
(Expr
, N_Aggregate
, N_Null
) then
8353 Make_Qualified_Expression
(Loc
,
8354 Subtype_Mark
=> New_Occurrence_Of
(Under_Typ
, Loc
),
8355 Expression
=> Expr
);
8358 Expr
:= Unchecked_Convert_To
(Typ
, Expr
);
8360 -- Do not truncate the result when scalar types are involved and
8361 -- Initialize/Normalize_Scalars is in effect.
8363 if Nkind
(Expr
) = N_Unchecked_Type_Conversion
8364 and then Is_Scalar_Type
(Under_Typ
)
8366 Set_No_Truncation
(Expr
);
8370 end Simple_Init_Private_Type
;
8372 -----------------------------
8373 -- Simple_Init_Scalar_Type --
8374 -----------------------------
8376 function Simple_Init_Scalar_Type
return Node_Id
is
8381 pragma Assert
(Init_Or_Norm_Scalars
or IV_Attribute
);
8383 -- Determine the size of the object. This is either the size provided
8384 -- by the caller, or the Esize of the scalar type.
8386 if Size
= No_Uint
or else Size
<= Uint_0
then
8387 Size_To_Use
:= UI_Max
(Uint_1
, Esize
(Typ
));
8389 Size_To_Use
:= Size
;
8392 -- The maximum size to use is 64 bits. This will create values of
8393 -- type Unsigned_64 and the range must fit this type.
8395 if Size_To_Use
/= No_Uint
and then Size_To_Use
> Uint_64
then
8396 Size_To_Use
:= Uint_64
;
8399 if Normalize_Scalars
and then not IV_Attribute
then
8400 Expr
:= Simple_Init_Normalize_Scalars_Type
(Size_To_Use
);
8402 Expr
:= Simple_Init_Initialize_Scalars_Type
(Size_To_Use
);
8405 -- The final expression is obtained by doing an unchecked conversion
8406 -- of this result to the base type of the required subtype. Use the
8407 -- base type to prevent the unchecked conversion from chopping bits,
8408 -- and then we set Kill_Range_Check to preserve the "bad" value.
8410 Expr
:= Unchecked_Convert_To
(Base_Type
(Typ
), Expr
);
8412 -- Ensure that the expression is not truncated since the "bad" bits
8413 -- are desired, and also kill the range checks.
8415 if Nkind
(Expr
) = N_Unchecked_Type_Conversion
then
8416 Set_Kill_Range_Check
(Expr
);
8417 Set_No_Truncation
(Expr
);
8421 end Simple_Init_Scalar_Type
;
8423 -- Start of processing for Get_Simple_Init_Val
8426 if Is_Private_Type
(Typ
) then
8427 return Simple_Init_Private_Type
;
8429 elsif Is_Scalar_Type
(Typ
) then
8430 if Has_Default_Aspect
(Typ
) then
8431 return Simple_Init_Defaulted_Type
;
8433 return Simple_Init_Scalar_Type
;
8436 -- Array type with Initialize or Normalize_Scalars
8438 elsif Is_Array_Type
(Typ
) then
8439 pragma Assert
(Init_Or_Norm_Scalars
);
8440 return Simple_Init_Array_Type
;
8442 -- Access type is initialized to null
8444 elsif Is_Access_Type
(Typ
) then
8445 return Make_Null
(Loc
);
8447 -- No other possibilities should arise, since we should only be calling
8448 -- Get_Simple_Init_Val if Needs_Simple_Initialization returned True,
8449 -- indicating one of the above cases held.
8452 raise Program_Error
;
8456 when RE_Not_Available
=>
8458 end Get_Simple_Init_Val
;
8460 ------------------------------
8461 -- Has_New_Non_Standard_Rep --
8462 ------------------------------
8464 function Has_New_Non_Standard_Rep
(T
: Entity_Id
) return Boolean is
8466 if not Is_Derived_Type
(T
) then
8467 return Has_Non_Standard_Rep
(T
)
8468 or else Has_Non_Standard_Rep
(Root_Type
(T
));
8470 -- If Has_Non_Standard_Rep is not set on the derived type, the
8471 -- representation is fully inherited.
8473 elsif not Has_Non_Standard_Rep
(T
) then
8477 return First_Rep_Item
(T
) /= First_Rep_Item
(Root_Type
(T
));
8479 -- May need a more precise check here: the First_Rep_Item may be a
8480 -- stream attribute, which does not affect the representation of the
8484 end Has_New_Non_Standard_Rep
;
8486 ----------------------
8487 -- Inline_Init_Proc --
8488 ----------------------
8490 function Inline_Init_Proc
(Typ
: Entity_Id
) return Boolean is
8492 -- The initialization proc of protected records is not worth inlining.
8493 -- In addition, when compiled for another unit for inlining purposes,
8494 -- it may make reference to entities that have not been elaborated yet.
8495 -- The initialization proc of records that need finalization contains
8496 -- a nested clean-up procedure that makes it impractical to inline as
8497 -- well, except for simple controlled types themselves. And similar
8498 -- considerations apply to task types.
8500 if Is_Concurrent_Type
(Typ
) then
8503 elsif Needs_Finalization
(Typ
) and then not Is_Controlled
(Typ
) then
8506 elsif Has_Task
(Typ
) then
8512 end Inline_Init_Proc
;
8518 function In_Runtime
(E
: Entity_Id
) return Boolean is
8523 while Scope
(S1
) /= Standard_Standard
loop
8527 return Is_RTU
(S1
, System
) or else Is_RTU
(S1
, Ada
);
8530 ----------------------------
8531 -- Initialization_Warning --
8532 ----------------------------
8534 procedure Initialization_Warning
(E
: Entity_Id
) is
8535 Warning_Needed
: Boolean;
8538 Warning_Needed
:= False;
8540 if Ekind
(Current_Scope
) = E_Package
8541 and then Static_Elaboration_Desired
(Current_Scope
)
8544 if Is_Record_Type
(E
) then
8545 if Has_Discriminants
(E
)
8546 or else Is_Limited_Type
(E
)
8547 or else Has_Non_Standard_Rep
(E
)
8549 Warning_Needed
:= True;
8552 -- Verify that at least one component has an initialization
8553 -- expression. No need for a warning on a type if all its
8554 -- components have no initialization.
8560 Comp
:= First_Component
(E
);
8561 while Present
(Comp
) loop
8562 if Ekind
(Comp
) = E_Discriminant
8564 (Nkind
(Parent
(Comp
)) = N_Component_Declaration
8565 and then Present
(Expression
(Parent
(Comp
))))
8567 Warning_Needed
:= True;
8571 Next_Component
(Comp
);
8576 if Warning_Needed
then
8578 ("Objects of the type cannot be initialized statically "
8579 & "by default??", Parent
(E
));
8584 Error_Msg_N
("Object cannot be initialized statically??", E
);
8587 end Initialization_Warning
;
8593 function Init_Formals
(Typ
: Entity_Id
) return List_Id
is
8594 Loc
: constant Source_Ptr
:= Sloc
(Typ
);
8598 -- First parameter is always _Init : in out typ. Note that we need this
8599 -- to be in/out because in the case of the task record value, there
8600 -- are default record fields (_Priority, _Size, -Task_Info) that may
8601 -- be referenced in the generated initialization routine.
8603 Formals
:= New_List
(
8604 Make_Parameter_Specification
(Loc
,
8605 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_uInit
),
8607 Out_Present
=> True,
8608 Parameter_Type
=> New_Occurrence_Of
(Typ
, Loc
)));
8610 -- For task record value, or type that contains tasks, add two more
8611 -- formals, _Master : Master_Id and _Chain : in out Activation_Chain
8612 -- We also add these parameters for the task record type case.
8615 or else (Is_Record_Type
(Typ
) and then Is_Task_Record_Type
(Typ
))
8618 Make_Parameter_Specification
(Loc
,
8619 Defining_Identifier
=>
8620 Make_Defining_Identifier
(Loc
, Name_uMaster
),
8622 New_Occurrence_Of
(RTE
(RE_Master_Id
), Loc
)));
8624 -- Add _Chain (not done for sequential elaboration policy, see
8625 -- comment for Create_Restricted_Task_Sequential in s-tarest.ads).
8627 if Partition_Elaboration_Policy
/= 'S' then
8629 Make_Parameter_Specification
(Loc
,
8630 Defining_Identifier
=>
8631 Make_Defining_Identifier
(Loc
, Name_uChain
),
8633 Out_Present
=> True,
8635 New_Occurrence_Of
(RTE
(RE_Activation_Chain
), Loc
)));
8639 Make_Parameter_Specification
(Loc
,
8640 Defining_Identifier
=>
8641 Make_Defining_Identifier
(Loc
, Name_uTask_Name
),
8643 Parameter_Type
=> New_Occurrence_Of
(Standard_String
, Loc
)));
8649 when RE_Not_Available
=>
8653 -------------------------
8654 -- Init_Secondary_Tags --
8655 -------------------------
8657 procedure Init_Secondary_Tags
8660 Init_Tags_List
: List_Id
;
8661 Stmts_List
: List_Id
;
8662 Fixed_Comps
: Boolean := True;
8663 Variable_Comps
: Boolean := True)
8665 Loc
: constant Source_Ptr
:= Sloc
(Target
);
8667 -- Inherit the C++ tag of the secondary dispatch table of Typ associated
8668 -- with Iface. Tag_Comp is the component of Typ that stores Iface_Tag.
8670 procedure Initialize_Tag
8673 Tag_Comp
: Entity_Id
;
8674 Iface_Tag
: Node_Id
);
8675 -- Initialize the tag of the secondary dispatch table of Typ associated
8676 -- with Iface. Tag_Comp is the component of Typ that stores Iface_Tag.
8677 -- Compiling under the CPP full ABI compatibility mode, if the ancestor
8678 -- of Typ CPP tagged type we generate code to inherit the contents of
8679 -- the dispatch table directly from the ancestor.
8681 --------------------
8682 -- Initialize_Tag --
8683 --------------------
8685 procedure Initialize_Tag
8688 Tag_Comp
: Entity_Id
;
8689 Iface_Tag
: Node_Id
)
8691 Comp_Typ
: Entity_Id
;
8692 Offset_To_Top_Comp
: Entity_Id
:= Empty
;
8695 -- Initialize pointer to secondary DT associated with the interface
8697 if not Is_Ancestor
(Iface
, Typ
, Use_Full_View
=> True) then
8698 Append_To
(Init_Tags_List
,
8699 Make_Assignment_Statement
(Loc
,
8701 Make_Selected_Component
(Loc
,
8702 Prefix
=> New_Copy_Tree
(Target
),
8703 Selector_Name
=> New_Occurrence_Of
(Tag_Comp
, Loc
)),
8705 New_Occurrence_Of
(Iface_Tag
, Loc
)));
8708 Comp_Typ
:= Scope
(Tag_Comp
);
8710 -- Initialize the entries of the table of interfaces. We generate a
8711 -- different call when the parent of the type has variable size
8714 if Comp_Typ
/= Etype
(Comp_Typ
)
8715 and then Is_Variable_Size_Record
(Etype
(Comp_Typ
))
8716 and then Chars
(Tag_Comp
) /= Name_uTag
8718 pragma Assert
(Present
(DT_Offset_To_Top_Func
(Tag_Comp
)));
8720 -- Issue error if Set_Dynamic_Offset_To_Top is not available in a
8721 -- configurable run-time environment.
8723 if not RTE_Available
(RE_Set_Dynamic_Offset_To_Top
) then
8725 ("variable size record with interface types", Typ
);
8730 -- Set_Dynamic_Offset_To_Top
8732 -- Prim_T => Typ'Tag,
8733 -- Interface_T => Iface'Tag,
8734 -- Offset_Value => n,
8735 -- Offset_Func => Fn'Address)
8737 Append_To
(Stmts_List
,
8738 Make_Procedure_Call_Statement
(Loc
,
8740 New_Occurrence_Of
(RTE
(RE_Set_Dynamic_Offset_To_Top
), Loc
),
8741 Parameter_Associations
=> New_List
(
8742 Make_Attribute_Reference
(Loc
,
8743 Prefix
=> New_Copy_Tree
(Target
),
8744 Attribute_Name
=> Name_Address
),
8746 Unchecked_Convert_To
(RTE
(RE_Tag
),
8748 (Node
(First_Elmt
(Access_Disp_Table
(Typ
))), Loc
)),
8750 Unchecked_Convert_To
(RTE
(RE_Tag
),
8752 (Node
(First_Elmt
(Access_Disp_Table
(Iface
))),
8755 Unchecked_Convert_To
8756 (RTE
(RE_Storage_Offset
),
8758 Make_Attribute_Reference
(Loc
,
8760 Make_Selected_Component
(Loc
,
8761 Prefix
=> New_Copy_Tree
(Target
),
8763 New_Occurrence_Of
(Tag_Comp
, Loc
)),
8764 Attribute_Name
=> Name_Position
))),
8766 Unchecked_Convert_To
(RTE
(RE_Offset_To_Top_Function_Ptr
),
8767 Make_Attribute_Reference
(Loc
,
8768 Prefix
=> New_Occurrence_Of
8769 (DT_Offset_To_Top_Func
(Tag_Comp
), Loc
),
8770 Attribute_Name
=> Name_Address
)))));
8772 -- In this case the next component stores the value of the offset
8775 Offset_To_Top_Comp
:= Next_Entity
(Tag_Comp
);
8776 pragma Assert
(Present
(Offset_To_Top_Comp
));
8778 Append_To
(Init_Tags_List
,
8779 Make_Assignment_Statement
(Loc
,
8781 Make_Selected_Component
(Loc
,
8782 Prefix
=> New_Copy_Tree
(Target
),
8784 New_Occurrence_Of
(Offset_To_Top_Comp
, Loc
)),
8788 Make_Attribute_Reference
(Loc
,
8790 Make_Selected_Component
(Loc
,
8791 Prefix
=> New_Copy_Tree
(Target
),
8792 Selector_Name
=> New_Occurrence_Of
(Tag_Comp
, Loc
)),
8793 Attribute_Name
=> Name_Position
))));
8795 -- Normal case: No discriminants in the parent type
8798 -- Don't need to set any value if the offset-to-top field is
8799 -- statically set or if this interface shares the primary
8802 if not Building_Static_Secondary_DT
(Typ
)
8803 and then not Is_Ancestor
(Iface
, Typ
, Use_Full_View
=> True)
8805 Append_To
(Stmts_List
,
8806 Build_Set_Static_Offset_To_Top
(Loc
,
8807 Iface_Tag
=> New_Occurrence_Of
(Iface_Tag
, Loc
),
8809 Unchecked_Convert_To
(RTE
(RE_Storage_Offset
),
8811 Make_Attribute_Reference
(Loc
,
8813 Make_Selected_Component
(Loc
,
8814 Prefix
=> New_Copy_Tree
(Target
),
8816 New_Occurrence_Of
(Tag_Comp
, Loc
)),
8817 Attribute_Name
=> Name_Position
)))));
8821 -- Register_Interface_Offset
8822 -- (Prim_T => Typ'Tag,
8823 -- Interface_T => Iface'Tag,
8824 -- Is_Constant => True,
8825 -- Offset_Value => n,
8826 -- Offset_Func => null);
8828 if not Building_Static_Secondary_DT
(Typ
)
8829 and then RTE_Available
(RE_Register_Interface_Offset
)
8831 Append_To
(Stmts_List
,
8832 Make_Procedure_Call_Statement
(Loc
,
8835 (RTE
(RE_Register_Interface_Offset
), Loc
),
8836 Parameter_Associations
=> New_List
(
8837 Unchecked_Convert_To
(RTE
(RE_Tag
),
8839 (Node
(First_Elmt
(Access_Disp_Table
(Typ
))), Loc
)),
8841 Unchecked_Convert_To
(RTE
(RE_Tag
),
8843 (Node
(First_Elmt
(Access_Disp_Table
(Iface
))), Loc
)),
8845 New_Occurrence_Of
(Standard_True
, Loc
),
8847 Unchecked_Convert_To
(RTE
(RE_Storage_Offset
),
8849 Make_Attribute_Reference
(Loc
,
8851 Make_Selected_Component
(Loc
,
8852 Prefix
=> New_Copy_Tree
(Target
),
8854 New_Occurrence_Of
(Tag_Comp
, Loc
)),
8855 Attribute_Name
=> Name_Position
))),
8864 Full_Typ
: Entity_Id
;
8865 Ifaces_List
: Elist_Id
;
8866 Ifaces_Comp_List
: Elist_Id
;
8867 Ifaces_Tag_List
: Elist_Id
;
8868 Iface_Elmt
: Elmt_Id
;
8869 Iface_Comp_Elmt
: Elmt_Id
;
8870 Iface_Tag_Elmt
: Elmt_Id
;
8872 In_Variable_Pos
: Boolean;
8874 -- Start of processing for Init_Secondary_Tags
8877 -- Handle private types
8879 if Present
(Full_View
(Typ
)) then
8880 Full_Typ
:= Full_View
(Typ
);
8885 Collect_Interfaces_Info
8886 (Full_Typ
, Ifaces_List
, Ifaces_Comp_List
, Ifaces_Tag_List
);
8888 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
8889 Iface_Comp_Elmt
:= First_Elmt
(Ifaces_Comp_List
);
8890 Iface_Tag_Elmt
:= First_Elmt
(Ifaces_Tag_List
);
8891 while Present
(Iface_Elmt
) loop
8892 Tag_Comp
:= Node
(Iface_Comp_Elmt
);
8894 -- Check if parent of record type has variable size components
8896 In_Variable_Pos
:= Scope
(Tag_Comp
) /= Etype
(Scope
(Tag_Comp
))
8897 and then Is_Variable_Size_Record
(Etype
(Scope
(Tag_Comp
)));
8899 -- If we are compiling under the CPP full ABI compatibility mode and
8900 -- the ancestor is a CPP_Pragma tagged type then we generate code to
8901 -- initialize the secondary tag components from tags that reference
8902 -- secondary tables filled with copy of parent slots.
8904 if Is_CPP_Class
(Root_Type
(Full_Typ
)) then
8906 -- Reject interface components located at variable offset in
8907 -- C++ derivations. This is currently unsupported.
8909 if not Fixed_Comps
and then In_Variable_Pos
then
8911 -- Locate the first dynamic component of the record. Done to
8912 -- improve the text of the warning.
8916 Comp_Typ
: Entity_Id
;
8919 Comp
:= First_Entity
(Typ
);
8920 while Present
(Comp
) loop
8921 Comp_Typ
:= Etype
(Comp
);
8923 if Ekind
(Comp
) /= E_Discriminant
8924 and then not Is_Tag
(Comp
)
8927 (Is_Record_Type
(Comp_Typ
)
8929 Is_Variable_Size_Record
(Base_Type
(Comp_Typ
)))
8931 (Is_Array_Type
(Comp_Typ
)
8932 and then Is_Variable_Size_Array
(Comp_Typ
));
8938 pragma Assert
(Present
(Comp
));
8939 Error_Msg_Node_2
:= Comp
;
8941 ("parent type & with dynamic component & cannot be parent"
8942 & " of 'C'P'P derivation if new interfaces are present",
8943 Typ
, Scope
(Original_Record_Component
(Comp
)));
8946 Sloc
(Scope
(Original_Record_Component
(Comp
)));
8948 ("type derived from 'C'P'P type & defined #",
8949 Typ
, Scope
(Original_Record_Component
(Comp
)));
8951 -- Avoid duplicated warnings
8956 -- Initialize secondary tags
8961 Iface
=> Node
(Iface_Elmt
),
8962 Tag_Comp
=> Tag_Comp
,
8963 Iface_Tag
=> Node
(Iface_Tag_Elmt
));
8966 -- Otherwise generate code to initialize the tag
8969 if (In_Variable_Pos
and then Variable_Comps
)
8970 or else (not In_Variable_Pos
and then Fixed_Comps
)
8974 Iface
=> Node
(Iface_Elmt
),
8975 Tag_Comp
=> Tag_Comp
,
8976 Iface_Tag
=> Node
(Iface_Tag_Elmt
));
8980 Next_Elmt
(Iface_Elmt
);
8981 Next_Elmt
(Iface_Comp_Elmt
);
8982 Next_Elmt
(Iface_Tag_Elmt
);
8984 end Init_Secondary_Tags
;
8986 ------------------------------
8987 -- Is_User_Defined_Equality --
8988 ------------------------------
8990 function Is_User_Defined_Equality
(Prim
: Node_Id
) return Boolean is
8992 return Chars
(Prim
) = Name_Op_Eq
8993 and then Etype
(First_Formal
(Prim
)) =
8994 Etype
(Next_Formal
(First_Formal
(Prim
)))
8995 and then Base_Type
(Etype
(Prim
)) = Standard_Boolean
;
8996 end Is_User_Defined_Equality
;
8998 ----------------------------------------
8999 -- Make_Controlling_Function_Wrappers --
9000 ----------------------------------------
9002 procedure Make_Controlling_Function_Wrappers
9003 (Tag_Typ
: Entity_Id
;
9004 Decl_List
: out List_Id
;
9005 Body_List
: out List_Id
)
9007 Loc
: constant Source_Ptr
:= Sloc
(Tag_Typ
);
9008 Prim_Elmt
: Elmt_Id
;
9010 Actual_List
: List_Id
;
9011 Formal_List
: List_Id
;
9013 Par_Formal
: Entity_Id
;
9014 Formal_Node
: Node_Id
;
9015 Func_Body
: Node_Id
;
9016 Func_Decl
: Node_Id
;
9017 Func_Spec
: Node_Id
;
9018 Return_Stmt
: Node_Id
;
9021 Decl_List
:= New_List
;
9022 Body_List
:= New_List
;
9024 Prim_Elmt
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
9025 while Present
(Prim_Elmt
) loop
9026 Subp
:= Node
(Prim_Elmt
);
9028 -- If a primitive function with a controlling result of the type has
9029 -- not been overridden by the user, then we must create a wrapper
9030 -- function here that effectively overrides it and invokes the
9031 -- (non-abstract) parent function. This can only occur for a null
9032 -- extension. Note that functions with anonymous controlling access
9033 -- results don't qualify and must be overridden. We also exclude
9034 -- Input attributes, since each type will have its own version of
9035 -- Input constructed by the expander. The test for Comes_From_Source
9036 -- is needed to distinguish inherited operations from renamings
9037 -- (which also have Alias set). We exclude internal entities with
9038 -- Interface_Alias to avoid generating duplicated wrappers since
9039 -- the primitive which covers the interface is also available in
9040 -- the list of primitive operations.
9042 -- The function may be abstract, or require_Overriding may be set
9043 -- for it, because tests for null extensions may already have reset
9044 -- the Is_Abstract_Subprogram_Flag. If Requires_Overriding is not
9045 -- set, functions that need wrappers are recognized by having an
9046 -- alias that returns the parent type.
9048 if Comes_From_Source
(Subp
)
9049 or else No
(Alias
(Subp
))
9050 or else Present
(Interface_Alias
(Subp
))
9051 or else Ekind
(Subp
) /= E_Function
9052 or else not Has_Controlling_Result
(Subp
)
9053 or else Is_Access_Type
(Etype
(Subp
))
9054 or else Is_Abstract_Subprogram
(Alias
(Subp
))
9055 or else Is_TSS
(Subp
, TSS_Stream_Input
)
9059 elsif Is_Abstract_Subprogram
(Subp
)
9060 or else Requires_Overriding
(Subp
)
9062 (Is_Null_Extension
(Etype
(Subp
))
9063 and then Etype
(Alias
(Subp
)) /= Etype
(Subp
))
9065 Formal_List
:= No_List
;
9066 Formal
:= First_Formal
(Subp
);
9068 if Present
(Formal
) then
9069 Formal_List
:= New_List
;
9071 while Present
(Formal
) loop
9073 (Make_Parameter_Specification
9075 Defining_Identifier
=>
9076 Make_Defining_Identifier
(Sloc
(Formal
),
9077 Chars
=> Chars
(Formal
)),
9078 In_Present
=> In_Present
(Parent
(Formal
)),
9079 Out_Present
=> Out_Present
(Parent
(Formal
)),
9080 Null_Exclusion_Present
=>
9081 Null_Exclusion_Present
(Parent
(Formal
)),
9083 New_Occurrence_Of
(Etype
(Formal
), Loc
),
9085 New_Copy_Tree
(Expression
(Parent
(Formal
)))),
9088 Next_Formal
(Formal
);
9093 Make_Function_Specification
(Loc
,
9094 Defining_Unit_Name
=>
9095 Make_Defining_Identifier
(Loc
,
9096 Chars
=> Chars
(Subp
)),
9097 Parameter_Specifications
=> Formal_List
,
9098 Result_Definition
=>
9099 New_Occurrence_Of
(Etype
(Subp
), Loc
));
9101 Func_Decl
:= Make_Subprogram_Declaration
(Loc
, Func_Spec
);
9102 Append_To
(Decl_List
, Func_Decl
);
9104 -- Build a wrapper body that calls the parent function. The body
9105 -- contains a single return statement that returns an extension
9106 -- aggregate whose ancestor part is a call to the parent function,
9107 -- passing the formals as actuals (with any controlling arguments
9108 -- converted to the types of the corresponding formals of the
9109 -- parent function, which might be anonymous access types), and
9110 -- having a null extension.
9112 Formal
:= First_Formal
(Subp
);
9113 Par_Formal
:= First_Formal
(Alias
(Subp
));
9114 Formal_Node
:= First
(Formal_List
);
9116 if Present
(Formal
) then
9117 Actual_List
:= New_List
;
9119 Actual_List
:= No_List
;
9122 while Present
(Formal
) loop
9123 if Is_Controlling_Formal
(Formal
) then
9124 Append_To
(Actual_List
,
9125 Make_Type_Conversion
(Loc
,
9127 New_Occurrence_Of
(Etype
(Par_Formal
), Loc
),
9130 (Defining_Identifier
(Formal_Node
), Loc
)));
9135 (Defining_Identifier
(Formal_Node
), Loc
));
9138 Next_Formal
(Formal
);
9139 Next_Formal
(Par_Formal
);
9144 Make_Simple_Return_Statement
(Loc
,
9146 Make_Extension_Aggregate
(Loc
,
9148 Make_Function_Call
(Loc
,
9150 New_Occurrence_Of
(Alias
(Subp
), Loc
),
9151 Parameter_Associations
=> Actual_List
),
9152 Null_Record_Present
=> True));
9155 Make_Subprogram_Body
(Loc
,
9156 Specification
=> New_Copy_Tree
(Func_Spec
),
9157 Declarations
=> Empty_List
,
9158 Handled_Statement_Sequence
=>
9159 Make_Handled_Sequence_Of_Statements
(Loc
,
9160 Statements
=> New_List
(Return_Stmt
)));
9162 Set_Defining_Unit_Name
9163 (Specification
(Func_Body
),
9164 Make_Defining_Identifier
(Loc
, Chars
(Subp
)));
9166 Append_To
(Body_List
, Func_Body
);
9168 -- Replace the inherited function with the wrapper function in the
9169 -- primitive operations list. We add the minimum decoration needed
9170 -- to override interface primitives.
9172 Set_Ekind
(Defining_Unit_Name
(Func_Spec
), E_Function
);
9174 Override_Dispatching_Operation
9175 (Tag_Typ
, Subp
, New_Op
=> Defining_Unit_Name
(Func_Spec
),
9176 Is_Wrapper
=> True);
9180 Next_Elmt
(Prim_Elmt
);
9182 end Make_Controlling_Function_Wrappers
;
9188 function Make_Eq_Body
9190 Eq_Name
: Name_Id
) return Node_Id
9192 Loc
: constant Source_Ptr
:= Sloc
(Parent
(Typ
));
9194 Def
: constant Node_Id
:= Parent
(Typ
);
9195 Stmts
: constant List_Id
:= New_List
;
9196 Variant_Case
: Boolean := Has_Discriminants
(Typ
);
9197 Comps
: Node_Id
:= Empty
;
9198 Typ_Def
: Node_Id
:= Type_Definition
(Def
);
9202 Predef_Spec_Or_Body
(Loc
,
9205 Profile
=> New_List
(
9206 Make_Parameter_Specification
(Loc
,
9207 Defining_Identifier
=>
9208 Make_Defining_Identifier
(Loc
, Name_X
),
9209 Parameter_Type
=> New_Occurrence_Of
(Typ
, Loc
)),
9211 Make_Parameter_Specification
(Loc
,
9212 Defining_Identifier
=>
9213 Make_Defining_Identifier
(Loc
, Name_Y
),
9214 Parameter_Type
=> New_Occurrence_Of
(Typ
, Loc
))),
9216 Ret_Type
=> Standard_Boolean
,
9219 if Variant_Case
then
9220 if Nkind
(Typ_Def
) = N_Derived_Type_Definition
then
9221 Typ_Def
:= Record_Extension_Part
(Typ_Def
);
9224 if Present
(Typ_Def
) then
9225 Comps
:= Component_List
(Typ_Def
);
9229 Present
(Comps
) and then Present
(Variant_Part
(Comps
));
9232 if Variant_Case
then
9234 Make_Eq_If
(Typ
, Discriminant_Specifications
(Def
)));
9235 Append_List_To
(Stmts
, Make_Eq_Case
(Typ
, Comps
));
9237 Make_Simple_Return_Statement
(Loc
,
9238 Expression
=> New_Occurrence_Of
(Standard_True
, Loc
)));
9242 Make_Simple_Return_Statement
(Loc
,
9244 Expand_Record_Equality
9247 Lhs
=> Make_Identifier
(Loc
, Name_X
),
9248 Rhs
=> Make_Identifier
(Loc
, Name_Y
),
9249 Bodies
=> Declarations
(Decl
))));
9252 Set_Handled_Statement_Sequence
9253 (Decl
, Make_Handled_Sequence_Of_Statements
(Loc
, Stmts
));
9261 -- <Make_Eq_If shared components>
9264 -- when V1 => <Make_Eq_Case> on subcomponents
9266 -- when Vn => <Make_Eq_Case> on subcomponents
9269 function Make_Eq_Case
9272 Discrs
: Elist_Id
:= New_Elmt_List
) return List_Id
9274 Loc
: constant Source_Ptr
:= Sloc
(E
);
9275 Result
: constant List_Id
:= New_List
;
9279 function Corresponding_Formal
(C
: Node_Id
) return Entity_Id
;
9280 -- Given the discriminant that controls a given variant of an unchecked
9281 -- union, find the formal of the equality function that carries the
9282 -- inferred value of the discriminant.
9284 function External_Name
(E
: Entity_Id
) return Name_Id
;
9285 -- The value of a given discriminant is conveyed in the corresponding
9286 -- formal parameter of the equality routine. The name of this formal
9287 -- parameter carries a one-character suffix which is removed here.
9289 --------------------------
9290 -- Corresponding_Formal --
9291 --------------------------
9293 function Corresponding_Formal
(C
: Node_Id
) return Entity_Id
is
9294 Discr
: constant Entity_Id
:= Entity
(Name
(Variant_Part
(C
)));
9298 Elm
:= First_Elmt
(Discrs
);
9299 while Present
(Elm
) loop
9300 if Chars
(Discr
) = External_Name
(Node
(Elm
)) then
9307 -- A formal of the proper name must be found
9309 raise Program_Error
;
9310 end Corresponding_Formal
;
9316 function External_Name
(E
: Entity_Id
) return Name_Id
is
9318 Get_Name_String
(Chars
(E
));
9319 Name_Len
:= Name_Len
- 1;
9323 -- Start of processing for Make_Eq_Case
9326 Append_To
(Result
, Make_Eq_If
(E
, Component_Items
(CL
)));
9328 if No
(Variant_Part
(CL
)) then
9332 Variant
:= First_Non_Pragma
(Variants
(Variant_Part
(CL
)));
9334 if No
(Variant
) then
9338 Alt_List
:= New_List
;
9339 while Present
(Variant
) loop
9340 Append_To
(Alt_List
,
9341 Make_Case_Statement_Alternative
(Loc
,
9342 Discrete_Choices
=> New_Copy_List
(Discrete_Choices
(Variant
)),
9344 Make_Eq_Case
(E
, Component_List
(Variant
), Discrs
)));
9345 Next_Non_Pragma
(Variant
);
9348 -- If we have an Unchecked_Union, use one of the parameters of the
9349 -- enclosing equality routine that captures the discriminant, to use
9350 -- as the expression in the generated case statement.
9352 if Is_Unchecked_Union
(E
) then
9354 Make_Case_Statement
(Loc
,
9356 New_Occurrence_Of
(Corresponding_Formal
(CL
), Loc
),
9357 Alternatives
=> Alt_List
));
9361 Make_Case_Statement
(Loc
,
9363 Make_Selected_Component
(Loc
,
9364 Prefix
=> Make_Identifier
(Loc
, Name_X
),
9365 Selector_Name
=> New_Copy
(Name
(Variant_Part
(CL
)))),
9366 Alternatives
=> Alt_List
));
9387 -- or a null statement if the list L is empty
9391 L
: List_Id
) return Node_Id
9393 Loc
: constant Source_Ptr
:= Sloc
(E
);
9395 Field_Name
: Name_Id
;
9400 return Make_Null_Statement
(Loc
);
9405 C
:= First_Non_Pragma
(L
);
9406 while Present
(C
) loop
9407 Field_Name
:= Chars
(Defining_Identifier
(C
));
9409 -- The tags must not be compared: they are not part of the value.
9410 -- Ditto for parent interfaces because their equality operator is
9413 -- Note also that in the following, we use Make_Identifier for
9414 -- the component names. Use of New_Occurrence_Of to identify the
9415 -- components would be incorrect because the wrong entities for
9416 -- discriminants could be picked up in the private type case.
9418 if Field_Name
= Name_uParent
9419 and then Is_Interface
(Etype
(Defining_Identifier
(C
)))
9423 elsif Field_Name
/= Name_uTag
then
9424 Evolve_Or_Else
(Cond
,
9427 Make_Selected_Component
(Loc
,
9428 Prefix
=> Make_Identifier
(Loc
, Name_X
),
9429 Selector_Name
=> Make_Identifier
(Loc
, Field_Name
)),
9432 Make_Selected_Component
(Loc
,
9433 Prefix
=> Make_Identifier
(Loc
, Name_Y
),
9434 Selector_Name
=> Make_Identifier
(Loc
, Field_Name
))));
9437 Next_Non_Pragma
(C
);
9441 return Make_Null_Statement
(Loc
);
9445 Make_Implicit_If_Statement
(E
,
9447 Then_Statements
=> New_List
(
9448 Make_Simple_Return_Statement
(Loc
,
9449 Expression
=> New_Occurrence_Of
(Standard_False
, Loc
))));
9458 function Make_Neq_Body
(Tag_Typ
: Entity_Id
) return Node_Id
is
9460 function Is_Predefined_Neq_Renaming
(Prim
: Node_Id
) return Boolean;
9461 -- Returns true if Prim is a renaming of an unresolved predefined
9462 -- inequality operation.
9464 --------------------------------
9465 -- Is_Predefined_Neq_Renaming --
9466 --------------------------------
9468 function Is_Predefined_Neq_Renaming
(Prim
: Node_Id
) return Boolean is
9470 return Chars
(Prim
) /= Name_Op_Ne
9471 and then Present
(Alias
(Prim
))
9472 and then Comes_From_Source
(Prim
)
9473 and then Is_Intrinsic_Subprogram
(Alias
(Prim
))
9474 and then Chars
(Alias
(Prim
)) = Name_Op_Ne
;
9475 end Is_Predefined_Neq_Renaming
;
9479 Loc
: constant Source_Ptr
:= Sloc
(Parent
(Tag_Typ
));
9480 Stmts
: constant List_Id
:= New_List
;
9482 Eq_Prim
: Entity_Id
;
9483 Left_Op
: Entity_Id
;
9484 Renaming_Prim
: Entity_Id
;
9485 Right_Op
: Entity_Id
;
9488 -- Start of processing for Make_Neq_Body
9491 -- For a call on a renaming of a dispatching subprogram that is
9492 -- overridden, if the overriding occurred before the renaming, then
9493 -- the body executed is that of the overriding declaration, even if the
9494 -- overriding declaration is not visible at the place of the renaming;
9495 -- otherwise, the inherited or predefined subprogram is called, see
9498 -- Stage 1: Search for a renaming of the inequality primitive and also
9499 -- search for an overriding of the equality primitive located before the
9500 -- renaming declaration.
9508 Renaming_Prim
:= Empty
;
9510 Elmt
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
9511 while Present
(Elmt
) loop
9512 Prim
:= Node
(Elmt
);
9514 if Is_User_Defined_Equality
(Prim
) and then No
(Alias
(Prim
)) then
9515 if No
(Renaming_Prim
) then
9516 pragma Assert
(No
(Eq_Prim
));
9520 elsif Is_Predefined_Neq_Renaming
(Prim
) then
9521 Renaming_Prim
:= Prim
;
9528 -- No further action needed if no renaming was found
9530 if No
(Renaming_Prim
) then
9534 -- Stage 2: Replace the renaming declaration by a subprogram declaration
9535 -- (required to add its body)
9537 Decl
:= Parent
(Parent
(Renaming_Prim
));
9539 Make_Subprogram_Declaration
(Loc
,
9540 Specification
=> Specification
(Decl
)));
9541 Set_Analyzed
(Decl
);
9543 -- Remove the decoration of intrinsic renaming subprogram
9545 Set_Is_Intrinsic_Subprogram
(Renaming_Prim
, False);
9546 Set_Convention
(Renaming_Prim
, Convention_Ada
);
9547 Set_Alias
(Renaming_Prim
, Empty
);
9548 Set_Has_Completion
(Renaming_Prim
, False);
9550 -- Stage 3: Build the corresponding body
9552 Left_Op
:= First_Formal
(Renaming_Prim
);
9553 Right_Op
:= Next_Formal
(Left_Op
);
9556 Predef_Spec_Or_Body
(Loc
,
9558 Name
=> Chars
(Renaming_Prim
),
9559 Profile
=> New_List
(
9560 Make_Parameter_Specification
(Loc
,
9561 Defining_Identifier
=>
9562 Make_Defining_Identifier
(Loc
, Chars
(Left_Op
)),
9563 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
)),
9565 Make_Parameter_Specification
(Loc
,
9566 Defining_Identifier
=>
9567 Make_Defining_Identifier
(Loc
, Chars
(Right_Op
)),
9568 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
))),
9570 Ret_Type
=> Standard_Boolean
,
9573 -- If the overriding of the equality primitive occurred before the
9574 -- renaming, then generate:
9576 -- function <Neq_Name> (X : Y : Typ) return Boolean is
9578 -- return not Oeq (X, Y);
9581 if Present
(Eq_Prim
) then
9584 -- Otherwise build a nested subprogram which performs the predefined
9585 -- evaluation of the equality operator. That is, generate:
9587 -- function <Neq_Name> (X : Y : Typ) return Boolean is
9588 -- function Oeq (X : Y) return Boolean is
9590 -- <<body of default implementation>>
9593 -- return not Oeq (X, Y);
9598 Local_Subp
: Node_Id
;
9600 Local_Subp
:= Make_Eq_Body
(Tag_Typ
, Name_Op_Eq
);
9601 Set_Declarations
(Decl
, New_List
(Local_Subp
));
9602 Target
:= Defining_Entity
(Local_Subp
);
9607 Make_Simple_Return_Statement
(Loc
,
9610 Make_Function_Call
(Loc
,
9611 Name
=> New_Occurrence_Of
(Target
, Loc
),
9612 Parameter_Associations
=> New_List
(
9613 Make_Identifier
(Loc
, Chars
(Left_Op
)),
9614 Make_Identifier
(Loc
, Chars
(Right_Op
)))))));
9616 Set_Handled_Statement_Sequence
9617 (Decl
, Make_Handled_Sequence_Of_Statements
(Loc
, Stmts
));
9621 -------------------------------
9622 -- Make_Null_Procedure_Specs --
9623 -------------------------------
9625 function Make_Null_Procedure_Specs
(Tag_Typ
: Entity_Id
) return List_Id
is
9626 Decl_List
: constant List_Id
:= New_List
;
9627 Loc
: constant Source_Ptr
:= Sloc
(Tag_Typ
);
9629 Formal_List
: List_Id
;
9630 New_Param_Spec
: Node_Id
;
9631 Parent_Subp
: Entity_Id
;
9632 Prim_Elmt
: Elmt_Id
;
9636 Prim_Elmt
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
9637 while Present
(Prim_Elmt
) loop
9638 Subp
:= Node
(Prim_Elmt
);
9640 -- If a null procedure inherited from an interface has not been
9641 -- overridden, then we build a null procedure declaration to
9642 -- override the inherited procedure.
9644 Parent_Subp
:= Alias
(Subp
);
9646 if Present
(Parent_Subp
)
9647 and then Is_Null_Interface_Primitive
(Parent_Subp
)
9649 Formal_List
:= No_List
;
9650 Formal
:= First_Formal
(Subp
);
9652 if Present
(Formal
) then
9653 Formal_List
:= New_List
;
9655 while Present
(Formal
) loop
9657 -- Copy the parameter spec including default expressions
9660 New_Copy_Tree
(Parent
(Formal
), New_Sloc
=> Loc
);
9662 -- Generate a new defining identifier for the new formal.
9663 -- required because New_Copy_Tree does not duplicate
9664 -- semantic fields (except itypes).
9666 Set_Defining_Identifier
(New_Param_Spec
,
9667 Make_Defining_Identifier
(Sloc
(Formal
),
9668 Chars
=> Chars
(Formal
)));
9670 -- For controlling arguments we must change their
9671 -- parameter type to reference the tagged type (instead
9672 -- of the interface type)
9674 if Is_Controlling_Formal
(Formal
) then
9675 if Nkind
(Parameter_Type
(Parent
(Formal
))) = N_Identifier
9677 Set_Parameter_Type
(New_Param_Spec
,
9678 New_Occurrence_Of
(Tag_Typ
, Loc
));
9681 (Nkind
(Parameter_Type
(Parent
(Formal
))) =
9682 N_Access_Definition
);
9683 Set_Subtype_Mark
(Parameter_Type
(New_Param_Spec
),
9684 New_Occurrence_Of
(Tag_Typ
, Loc
));
9688 Append
(New_Param_Spec
, Formal_List
);
9690 Next_Formal
(Formal
);
9694 Append_To
(Decl_List
,
9695 Make_Subprogram_Declaration
(Loc
,
9696 Make_Procedure_Specification
(Loc
,
9697 Defining_Unit_Name
=>
9698 Make_Defining_Identifier
(Loc
, Chars
(Subp
)),
9699 Parameter_Specifications
=> Formal_List
,
9700 Null_Present
=> True)));
9703 Next_Elmt
(Prim_Elmt
);
9707 end Make_Null_Procedure_Specs
;
9709 -------------------------------------
9710 -- Make_Predefined_Primitive_Specs --
9711 -------------------------------------
9713 procedure Make_Predefined_Primitive_Specs
9714 (Tag_Typ
: Entity_Id
;
9715 Predef_List
: out List_Id
;
9716 Renamed_Eq
: out Entity_Id
)
9718 function Is_Predefined_Eq_Renaming
(Prim
: Node_Id
) return Boolean;
9719 -- Returns true if Prim is a renaming of an unresolved predefined
9720 -- equality operation.
9722 -------------------------------
9723 -- Is_Predefined_Eq_Renaming --
9724 -------------------------------
9726 function Is_Predefined_Eq_Renaming
(Prim
: Node_Id
) return Boolean is
9728 return Chars
(Prim
) /= Name_Op_Eq
9729 and then Present
(Alias
(Prim
))
9730 and then Comes_From_Source
(Prim
)
9731 and then Is_Intrinsic_Subprogram
(Alias
(Prim
))
9732 and then Chars
(Alias
(Prim
)) = Name_Op_Eq
;
9733 end Is_Predefined_Eq_Renaming
;
9737 Loc
: constant Source_Ptr
:= Sloc
(Tag_Typ
);
9738 Res
: constant List_Id
:= New_List
;
9739 Eq_Name
: Name_Id
:= Name_Op_Eq
;
9740 Eq_Needed
: Boolean;
9744 Has_Predef_Eq_Renaming
: Boolean := False;
9745 -- Set to True if Tag_Typ has a primitive that renames the predefined
9746 -- equality operator. Used to implement (RM 8-5-4(8)).
9748 -- Start of processing for Make_Predefined_Primitive_Specs
9751 Renamed_Eq
:= Empty
;
9755 Append_To
(Res
, Predef_Spec_Or_Body
(Loc
,
9758 Profile
=> New_List
(
9759 Make_Parameter_Specification
(Loc
,
9760 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_X
),
9761 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
))),
9763 Ret_Type
=> Standard_Long_Long_Integer
));
9765 -- Specs for dispatching stream attributes
9768 Stream_Op_TSS_Names
:
9769 constant array (Positive range <>) of TSS_Name_Type
:=
9776 for Op
in Stream_Op_TSS_Names
'Range loop
9777 if Stream_Operation_OK
(Tag_Typ
, Stream_Op_TSS_Names
(Op
)) then
9779 Predef_Stream_Attr_Spec
(Loc
, Tag_Typ
,
9780 Stream_Op_TSS_Names
(Op
)));
9785 -- Spec of "=" is expanded if the type is not limited and if a user
9786 -- defined "=" was not already declared for the non-full view of a
9787 -- private extension
9789 if not Is_Limited_Type
(Tag_Typ
) then
9791 Prim
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
9792 while Present
(Prim
) loop
9794 -- If a primitive is encountered that renames the predefined
9795 -- equality operator before reaching any explicit equality
9796 -- primitive, then we still need to create a predefined equality
9797 -- function, because calls to it can occur via the renaming. A
9798 -- new name is created for the equality to avoid conflicting with
9799 -- any user-defined equality. (Note that this doesn't account for
9800 -- renamings of equality nested within subpackages???)
9802 if Is_Predefined_Eq_Renaming
(Node
(Prim
)) then
9803 Has_Predef_Eq_Renaming
:= True;
9804 Eq_Name
:= New_External_Name
(Chars
(Node
(Prim
)), 'E');
9806 -- User-defined equality
9808 elsif Is_User_Defined_Equality
(Node
(Prim
)) then
9809 if No
(Alias
(Node
(Prim
)))
9810 or else Nkind
(Unit_Declaration_Node
(Node
(Prim
))) =
9811 N_Subprogram_Renaming_Declaration
9816 -- If the parent is not an interface type and has an abstract
9817 -- equality function explicitly defined in the sources, then
9818 -- the inherited equality is abstract as well, and no body can
9819 -- be created for it.
9821 elsif not Is_Interface
(Etype
(Tag_Typ
))
9822 and then Present
(Alias
(Node
(Prim
)))
9823 and then Comes_From_Source
(Alias
(Node
(Prim
)))
9824 and then Is_Abstract_Subprogram
(Alias
(Node
(Prim
)))
9829 -- If the type has an equality function corresponding with
9830 -- a primitive defined in an interface type, the inherited
9831 -- equality is abstract as well, and no body can be created
9834 elsif Present
(Alias
(Node
(Prim
)))
9835 and then Comes_From_Source
(Ultimate_Alias
(Node
(Prim
)))
9838 (Find_Dispatching_Type
(Ultimate_Alias
(Node
(Prim
))))
9848 -- If a renaming of predefined equality was found but there was no
9849 -- user-defined equality (so Eq_Needed is still true), then set the
9850 -- name back to Name_Op_Eq. But in the case where a user-defined
9851 -- equality was located after such a renaming, then the predefined
9852 -- equality function is still needed, so Eq_Needed must be set back
9855 if Eq_Name
/= Name_Op_Eq
then
9857 Eq_Name
:= Name_Op_Eq
;
9864 Eq_Spec
:= Predef_Spec_Or_Body
(Loc
,
9867 Profile
=> New_List
(
9868 Make_Parameter_Specification
(Loc
,
9869 Defining_Identifier
=>
9870 Make_Defining_Identifier
(Loc
, Name_X
),
9871 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
)),
9873 Make_Parameter_Specification
(Loc
,
9874 Defining_Identifier
=>
9875 Make_Defining_Identifier
(Loc
, Name_Y
),
9876 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
))),
9877 Ret_Type
=> Standard_Boolean
);
9878 Append_To
(Res
, Eq_Spec
);
9880 if Has_Predef_Eq_Renaming
then
9881 Renamed_Eq
:= Defining_Unit_Name
(Specification
(Eq_Spec
));
9883 Prim
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
9884 while Present
(Prim
) loop
9886 -- Any renamings of equality that appeared before an
9887 -- overriding equality must be updated to refer to the
9888 -- entity for the predefined equality, otherwise calls via
9889 -- the renaming would get incorrectly resolved to call the
9890 -- user-defined equality function.
9892 if Is_Predefined_Eq_Renaming
(Node
(Prim
)) then
9893 Set_Alias
(Node
(Prim
), Renamed_Eq
);
9895 -- Exit upon encountering a user-defined equality
9897 elsif Chars
(Node
(Prim
)) = Name_Op_Eq
9898 and then No
(Alias
(Node
(Prim
)))
9908 -- Spec for dispatching assignment
9910 Append_To
(Res
, Predef_Spec_Or_Body
(Loc
,
9912 Name
=> Name_uAssign
,
9913 Profile
=> New_List
(
9914 Make_Parameter_Specification
(Loc
,
9915 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_X
),
9916 Out_Present
=> True,
9917 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
)),
9919 Make_Parameter_Specification
(Loc
,
9920 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_Y
),
9921 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
)))));
9924 -- Ada 2005: Generate declarations for the following primitive
9925 -- operations for limited interfaces and synchronized types that
9926 -- implement a limited interface.
9928 -- Disp_Asynchronous_Select
9929 -- Disp_Conditional_Select
9930 -- Disp_Get_Prim_Op_Kind
9933 -- Disp_Timed_Select
9935 -- Disable the generation of these bodies if No_Dispatching_Calls,
9936 -- Ravenscar or ZFP is active.
9938 if Ada_Version
>= Ada_2005
9939 and then not Restriction_Active
(No_Dispatching_Calls
)
9940 and then not Restriction_Active
(No_Select_Statements
)
9941 and then RTE_Available
(RE_Select_Specific_Data
)
9943 -- These primitives are defined abstract in interface types
9945 if Is_Interface
(Tag_Typ
)
9946 and then Is_Limited_Record
(Tag_Typ
)
9949 Make_Abstract_Subprogram_Declaration
(Loc
,
9951 Make_Disp_Asynchronous_Select_Spec
(Tag_Typ
)));
9954 Make_Abstract_Subprogram_Declaration
(Loc
,
9956 Make_Disp_Conditional_Select_Spec
(Tag_Typ
)));
9959 Make_Abstract_Subprogram_Declaration
(Loc
,
9961 Make_Disp_Get_Prim_Op_Kind_Spec
(Tag_Typ
)));
9964 Make_Abstract_Subprogram_Declaration
(Loc
,
9966 Make_Disp_Get_Task_Id_Spec
(Tag_Typ
)));
9969 Make_Abstract_Subprogram_Declaration
(Loc
,
9971 Make_Disp_Requeue_Spec
(Tag_Typ
)));
9974 Make_Abstract_Subprogram_Declaration
(Loc
,
9976 Make_Disp_Timed_Select_Spec
(Tag_Typ
)));
9978 -- If ancestor is an interface type, declare non-abstract primitives
9979 -- to override the abstract primitives of the interface type.
9981 -- In VM targets we define these primitives in all root tagged types
9982 -- that are not interface types. Done because in VM targets we don't
9983 -- have secondary dispatch tables and any derivation of Tag_Typ may
9984 -- cover limited interfaces (which always have these primitives since
9985 -- they may be ancestors of synchronized interface types).
9987 elsif (not Is_Interface
(Tag_Typ
)
9988 and then Is_Interface
(Etype
(Tag_Typ
))
9989 and then Is_Limited_Record
(Etype
(Tag_Typ
)))
9991 (Is_Concurrent_Record_Type
(Tag_Typ
)
9992 and then Has_Interfaces
(Tag_Typ
))
9994 (not Tagged_Type_Expansion
9995 and then not Is_Interface
(Tag_Typ
)
9996 and then Tag_Typ
= Root_Type
(Tag_Typ
))
9999 Make_Subprogram_Declaration
(Loc
,
10001 Make_Disp_Asynchronous_Select_Spec
(Tag_Typ
)));
10004 Make_Subprogram_Declaration
(Loc
,
10006 Make_Disp_Conditional_Select_Spec
(Tag_Typ
)));
10009 Make_Subprogram_Declaration
(Loc
,
10011 Make_Disp_Get_Prim_Op_Kind_Spec
(Tag_Typ
)));
10014 Make_Subprogram_Declaration
(Loc
,
10016 Make_Disp_Get_Task_Id_Spec
(Tag_Typ
)));
10019 Make_Subprogram_Declaration
(Loc
,
10021 Make_Disp_Requeue_Spec
(Tag_Typ
)));
10024 Make_Subprogram_Declaration
(Loc
,
10026 Make_Disp_Timed_Select_Spec
(Tag_Typ
)));
10030 -- All tagged types receive their own Deep_Adjust and Deep_Finalize
10031 -- regardless of whether they are controlled or may contain controlled
10034 -- Do not generate the routines if finalization is disabled
10036 if Restriction_Active
(No_Finalization
) then
10040 if not Is_Limited_Type
(Tag_Typ
) then
10041 Append_To
(Res
, Predef_Deep_Spec
(Loc
, Tag_Typ
, TSS_Deep_Adjust
));
10044 Append_To
(Res
, Predef_Deep_Spec
(Loc
, Tag_Typ
, TSS_Deep_Finalize
));
10047 Predef_List
:= Res
;
10048 end Make_Predefined_Primitive_Specs
;
10050 -------------------------
10051 -- Make_Tag_Assignment --
10052 -------------------------
10054 function Make_Tag_Assignment
(N
: Node_Id
) return Node_Id
is
10055 Loc
: constant Source_Ptr
:= Sloc
(N
);
10056 Def_If
: constant Entity_Id
:= Defining_Identifier
(N
);
10057 Expr
: constant Node_Id
:= Expression
(N
);
10058 Typ
: constant Entity_Id
:= Etype
(Def_If
);
10059 Full_Typ
: constant Entity_Id
:= Underlying_Type
(Typ
);
10063 -- This expansion activity is called during analysis, but cannot
10064 -- be applied in ASIS mode when other expansion is disabled.
10066 if Is_Tagged_Type
(Typ
)
10067 and then not Is_Class_Wide_Type
(Typ
)
10068 and then not Is_CPP_Class
(Typ
)
10069 and then Tagged_Type_Expansion
10070 and then Nkind
(Expr
) /= N_Aggregate
10071 and then not ASIS_Mode
10072 and then (Nkind
(Expr
) /= N_Qualified_Expression
10073 or else Nkind
(Expression
(Expr
)) /= N_Aggregate
)
10076 Make_Selected_Component
(Loc
,
10077 Prefix
=> New_Occurrence_Of
(Def_If
, Loc
),
10079 New_Occurrence_Of
(First_Tag_Component
(Full_Typ
), Loc
));
10080 Set_Assignment_OK
(New_Ref
);
10083 Make_Assignment_Statement
(Loc
,
10086 Unchecked_Convert_To
(RTE
(RE_Tag
),
10087 New_Occurrence_Of
(Node
10088 (First_Elmt
(Access_Disp_Table
(Full_Typ
))), Loc
)));
10092 end Make_Tag_Assignment
;
10094 ----------------------
10095 -- Predef_Deep_Spec --
10096 ----------------------
10098 function Predef_Deep_Spec
10100 Tag_Typ
: Entity_Id
;
10101 Name
: TSS_Name_Type
;
10102 For_Body
: Boolean := False) return Node_Id
10107 -- V : in out Tag_Typ
10109 Formals
:= New_List
(
10110 Make_Parameter_Specification
(Loc
,
10111 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_V
),
10112 In_Present
=> True,
10113 Out_Present
=> True,
10114 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
)));
10116 -- F : Boolean := True
10118 if Name
= TSS_Deep_Adjust
10119 or else Name
= TSS_Deep_Finalize
10121 Append_To
(Formals
,
10122 Make_Parameter_Specification
(Loc
,
10123 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_F
),
10124 Parameter_Type
=> New_Occurrence_Of
(Standard_Boolean
, Loc
),
10125 Expression
=> New_Occurrence_Of
(Standard_True
, Loc
)));
10129 Predef_Spec_Or_Body
(Loc
,
10130 Name
=> Make_TSS_Name
(Tag_Typ
, Name
),
10131 Tag_Typ
=> Tag_Typ
,
10132 Profile
=> Formals
,
10133 For_Body
=> For_Body
);
10136 when RE_Not_Available
=>
10138 end Predef_Deep_Spec
;
10140 -------------------------
10141 -- Predef_Spec_Or_Body --
10142 -------------------------
10144 function Predef_Spec_Or_Body
10146 Tag_Typ
: Entity_Id
;
10149 Ret_Type
: Entity_Id
:= Empty
;
10150 For_Body
: Boolean := False) return Node_Id
10152 Id
: constant Entity_Id
:= Make_Defining_Identifier
(Loc
, Name
);
10156 Set_Is_Public
(Id
, Is_Public
(Tag_Typ
));
10158 -- The internal flag is set to mark these declarations because they have
10159 -- specific properties. First, they are primitives even if they are not
10160 -- defined in the type scope (the freezing point is not necessarily in
10161 -- the same scope). Second, the predefined equality can be overridden by
10162 -- a user-defined equality, no body will be generated in this case.
10164 Set_Is_Internal
(Id
);
10166 if not Debug_Generated_Code
then
10167 Set_Debug_Info_Off
(Id
);
10170 if No
(Ret_Type
) then
10172 Make_Procedure_Specification
(Loc
,
10173 Defining_Unit_Name
=> Id
,
10174 Parameter_Specifications
=> Profile
);
10177 Make_Function_Specification
(Loc
,
10178 Defining_Unit_Name
=> Id
,
10179 Parameter_Specifications
=> Profile
,
10180 Result_Definition
=> New_Occurrence_Of
(Ret_Type
, Loc
));
10183 if Is_Interface
(Tag_Typ
) then
10184 return Make_Abstract_Subprogram_Declaration
(Loc
, Spec
);
10186 -- If body case, return empty subprogram body. Note that this is ill-
10187 -- formed, because there is not even a null statement, and certainly not
10188 -- a return in the function case. The caller is expected to do surgery
10189 -- on the body to add the appropriate stuff.
10191 elsif For_Body
then
10192 return Make_Subprogram_Body
(Loc
, Spec
, Empty_List
, Empty
);
10194 -- For the case of an Input attribute predefined for an abstract type,
10195 -- generate an abstract specification. This will never be called, but we
10196 -- need the slot allocated in the dispatching table so that attributes
10197 -- typ'Class'Input and typ'Class'Output will work properly.
10199 elsif Is_TSS
(Name
, TSS_Stream_Input
)
10200 and then Is_Abstract_Type
(Tag_Typ
)
10202 return Make_Abstract_Subprogram_Declaration
(Loc
, Spec
);
10204 -- Normal spec case, where we return a subprogram declaration
10207 return Make_Subprogram_Declaration
(Loc
, Spec
);
10209 end Predef_Spec_Or_Body
;
10211 -----------------------------
10212 -- Predef_Stream_Attr_Spec --
10213 -----------------------------
10215 function Predef_Stream_Attr_Spec
10217 Tag_Typ
: Entity_Id
;
10218 Name
: TSS_Name_Type
;
10219 For_Body
: Boolean := False) return Node_Id
10221 Ret_Type
: Entity_Id
;
10224 if Name
= TSS_Stream_Input
then
10225 Ret_Type
:= Tag_Typ
;
10231 Predef_Spec_Or_Body
10233 Name
=> Make_TSS_Name
(Tag_Typ
, Name
),
10234 Tag_Typ
=> Tag_Typ
,
10235 Profile
=> Build_Stream_Attr_Profile
(Loc
, Tag_Typ
, Name
),
10236 Ret_Type
=> Ret_Type
,
10237 For_Body
=> For_Body
);
10238 end Predef_Stream_Attr_Spec
;
10240 ---------------------------------
10241 -- Predefined_Primitive_Bodies --
10242 ---------------------------------
10244 function Predefined_Primitive_Bodies
10245 (Tag_Typ
: Entity_Id
;
10246 Renamed_Eq
: Entity_Id
) return List_Id
10248 Loc
: constant Source_Ptr
:= Sloc
(Tag_Typ
);
10249 Res
: constant List_Id
:= New_List
;
10250 Adj_Call
: Node_Id
;
10252 Fin_Call
: Node_Id
;
10254 Eq_Needed
: Boolean;
10258 pragma Warnings
(Off
, Ent
);
10261 pragma Assert
(not Is_Interface
(Tag_Typ
));
10263 -- See if we have a predefined "=" operator
10265 if Present
(Renamed_Eq
) then
10267 Eq_Name
:= Chars
(Renamed_Eq
);
10269 -- If the parent is an interface type then it has defined all the
10270 -- predefined primitives abstract and we need to check if the type
10271 -- has some user defined "=" function which matches the profile of
10272 -- the Ada predefined equality operator to avoid generating it.
10274 elsif Is_Interface
(Etype
(Tag_Typ
)) then
10276 Eq_Name
:= Name_Op_Eq
;
10278 Prim
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
10279 while Present
(Prim
) loop
10280 if Chars
(Node
(Prim
)) = Name_Op_Eq
10281 and then not Is_Internal
(Node
(Prim
))
10282 and then Present
(First_Entity
(Node
(Prim
)))
10284 -- The predefined equality primitive must have exactly two
10285 -- formals whose type is this tagged type
10287 and then Present
(Last_Entity
(Node
(Prim
)))
10288 and then Next_Entity
(First_Entity
(Node
(Prim
)))
10289 = Last_Entity
(Node
(Prim
))
10290 and then Etype
(First_Entity
(Node
(Prim
))) = Tag_Typ
10291 and then Etype
(Last_Entity
(Node
(Prim
))) = Tag_Typ
10293 Eq_Needed
:= False;
10294 Eq_Name
:= No_Name
;
10302 Eq_Needed
:= False;
10303 Eq_Name
:= No_Name
;
10305 Prim
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
10306 while Present
(Prim
) loop
10307 if Chars
(Node
(Prim
)) = Name_Op_Eq
10308 and then Is_Internal
(Node
(Prim
))
10311 Eq_Name
:= Name_Op_Eq
;
10321 Decl
:= Predef_Spec_Or_Body
(Loc
,
10322 Tag_Typ
=> Tag_Typ
,
10323 Name
=> Name_uSize
,
10324 Profile
=> New_List
(
10325 Make_Parameter_Specification
(Loc
,
10326 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_X
),
10327 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
))),
10329 Ret_Type
=> Standard_Long_Long_Integer
,
10332 Set_Handled_Statement_Sequence
(Decl
,
10333 Make_Handled_Sequence_Of_Statements
(Loc
, New_List
(
10334 Make_Simple_Return_Statement
(Loc
,
10336 Make_Attribute_Reference
(Loc
,
10337 Prefix
=> Make_Identifier
(Loc
, Name_X
),
10338 Attribute_Name
=> Name_Size
)))));
10340 Append_To
(Res
, Decl
);
10342 -- Bodies for Dispatching stream IO routines. We need these only for
10343 -- non-limited types (in the limited case there is no dispatching).
10344 -- We also skip them if dispatching or finalization are not available
10345 -- or if stream operations are prohibited by restriction No_Streams or
10346 -- from use of pragma/aspect No_Tagged_Streams.
10348 if Stream_Operation_OK
(Tag_Typ
, TSS_Stream_Read
)
10349 and then No
(TSS
(Tag_Typ
, TSS_Stream_Read
))
10351 Build_Record_Read_Procedure
(Loc
, Tag_Typ
, Decl
, Ent
);
10352 Append_To
(Res
, Decl
);
10355 if Stream_Operation_OK
(Tag_Typ
, TSS_Stream_Write
)
10356 and then No
(TSS
(Tag_Typ
, TSS_Stream_Write
))
10358 Build_Record_Write_Procedure
(Loc
, Tag_Typ
, Decl
, Ent
);
10359 Append_To
(Res
, Decl
);
10362 -- Skip body of _Input for the abstract case, since the corresponding
10363 -- spec is abstract (see Predef_Spec_Or_Body).
10365 if not Is_Abstract_Type
(Tag_Typ
)
10366 and then Stream_Operation_OK
(Tag_Typ
, TSS_Stream_Input
)
10367 and then No
(TSS
(Tag_Typ
, TSS_Stream_Input
))
10369 Build_Record_Or_Elementary_Input_Function
10370 (Loc
, Tag_Typ
, Decl
, Ent
);
10371 Append_To
(Res
, Decl
);
10374 if Stream_Operation_OK
(Tag_Typ
, TSS_Stream_Output
)
10375 and then No
(TSS
(Tag_Typ
, TSS_Stream_Output
))
10377 Build_Record_Or_Elementary_Output_Procedure
(Loc
, Tag_Typ
, Decl
, Ent
);
10378 Append_To
(Res
, Decl
);
10381 -- Ada 2005: Generate bodies for the following primitive operations for
10382 -- limited interfaces and synchronized types that implement a limited
10385 -- disp_asynchronous_select
10386 -- disp_conditional_select
10387 -- disp_get_prim_op_kind
10388 -- disp_get_task_id
10389 -- disp_timed_select
10391 -- The interface versions will have null bodies
10393 -- Disable the generation of these bodies if No_Dispatching_Calls,
10394 -- Ravenscar or ZFP is active.
10396 -- In VM targets we define these primitives in all root tagged types
10397 -- that are not interface types. Done because in VM targets we don't
10398 -- have secondary dispatch tables and any derivation of Tag_Typ may
10399 -- cover limited interfaces (which always have these primitives since
10400 -- they may be ancestors of synchronized interface types).
10402 if Ada_Version
>= Ada_2005
10403 and then not Is_Interface
(Tag_Typ
)
10405 ((Is_Interface
(Etype
(Tag_Typ
))
10406 and then Is_Limited_Record
(Etype
(Tag_Typ
)))
10408 (Is_Concurrent_Record_Type
(Tag_Typ
)
10409 and then Has_Interfaces
(Tag_Typ
))
10411 (not Tagged_Type_Expansion
10412 and then Tag_Typ
= Root_Type
(Tag_Typ
)))
10413 and then not Restriction_Active
(No_Dispatching_Calls
)
10414 and then not Restriction_Active
(No_Select_Statements
)
10415 and then RTE_Available
(RE_Select_Specific_Data
)
10417 Append_To
(Res
, Make_Disp_Asynchronous_Select_Body
(Tag_Typ
));
10418 Append_To
(Res
, Make_Disp_Conditional_Select_Body
(Tag_Typ
));
10419 Append_To
(Res
, Make_Disp_Get_Prim_Op_Kind_Body
(Tag_Typ
));
10420 Append_To
(Res
, Make_Disp_Get_Task_Id_Body
(Tag_Typ
));
10421 Append_To
(Res
, Make_Disp_Requeue_Body
(Tag_Typ
));
10422 Append_To
(Res
, Make_Disp_Timed_Select_Body
(Tag_Typ
));
10425 if not Is_Limited_Type
(Tag_Typ
) and then not Is_Interface
(Tag_Typ
) then
10427 -- Body for equality
10430 Decl
:= Make_Eq_Body
(Tag_Typ
, Eq_Name
);
10431 Append_To
(Res
, Decl
);
10434 -- Body for inequality (if required)
10436 Decl
:= Make_Neq_Body
(Tag_Typ
);
10438 if Present
(Decl
) then
10439 Append_To
(Res
, Decl
);
10442 -- Body for dispatching assignment
10445 Predef_Spec_Or_Body
(Loc
,
10446 Tag_Typ
=> Tag_Typ
,
10447 Name
=> Name_uAssign
,
10448 Profile
=> New_List
(
10449 Make_Parameter_Specification
(Loc
,
10450 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_X
),
10451 Out_Present
=> True,
10452 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
)),
10454 Make_Parameter_Specification
(Loc
,
10455 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_Y
),
10456 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
))),
10459 Set_Handled_Statement_Sequence
(Decl
,
10460 Make_Handled_Sequence_Of_Statements
(Loc
, New_List
(
10461 Make_Assignment_Statement
(Loc
,
10462 Name
=> Make_Identifier
(Loc
, Name_X
),
10463 Expression
=> Make_Identifier
(Loc
, Name_Y
)))));
10465 Append_To
(Res
, Decl
);
10468 -- Generate empty bodies of routines Deep_Adjust and Deep_Finalize for
10469 -- tagged types which do not contain controlled components.
10471 -- Do not generate the routines if finalization is disabled
10473 if Restriction_Active
(No_Finalization
) then
10476 elsif not Has_Controlled_Component
(Tag_Typ
) then
10477 if not Is_Limited_Type
(Tag_Typ
) then
10479 Decl
:= Predef_Deep_Spec
(Loc
, Tag_Typ
, TSS_Deep_Adjust
, True);
10481 if Is_Controlled
(Tag_Typ
) then
10484 Obj_Ref
=> Make_Identifier
(Loc
, Name_V
),
10488 if No
(Adj_Call
) then
10489 Adj_Call
:= Make_Null_Statement
(Loc
);
10492 Set_Handled_Statement_Sequence
(Decl
,
10493 Make_Handled_Sequence_Of_Statements
(Loc
,
10494 Statements
=> New_List
(Adj_Call
)));
10496 Append_To
(Res
, Decl
);
10500 Decl
:= Predef_Deep_Spec
(Loc
, Tag_Typ
, TSS_Deep_Finalize
, True);
10502 if Is_Controlled
(Tag_Typ
) then
10505 (Obj_Ref
=> Make_Identifier
(Loc
, Name_V
),
10509 if No
(Fin_Call
) then
10510 Fin_Call
:= Make_Null_Statement
(Loc
);
10513 Set_Handled_Statement_Sequence
(Decl
,
10514 Make_Handled_Sequence_Of_Statements
(Loc
,
10515 Statements
=> New_List
(Fin_Call
)));
10517 Append_To
(Res
, Decl
);
10521 end Predefined_Primitive_Bodies
;
10523 ---------------------------------
10524 -- Predefined_Primitive_Freeze --
10525 ---------------------------------
10527 function Predefined_Primitive_Freeze
10528 (Tag_Typ
: Entity_Id
) return List_Id
10530 Res
: constant List_Id
:= New_List
;
10535 Prim
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
10536 while Present
(Prim
) loop
10537 if Is_Predefined_Dispatching_Operation
(Node
(Prim
)) then
10538 Frnodes
:= Freeze_Entity
(Node
(Prim
), Tag_Typ
);
10540 if Present
(Frnodes
) then
10541 Append_List_To
(Res
, Frnodes
);
10549 end Predefined_Primitive_Freeze
;
10551 -------------------------
10552 -- Stream_Operation_OK --
10553 -------------------------
10555 function Stream_Operation_OK
10557 Operation
: TSS_Name_Type
) return Boolean
10559 Has_Predefined_Or_Specified_Stream_Attribute
: Boolean := False;
10562 -- Special case of a limited type extension: a default implementation
10563 -- of the stream attributes Read or Write exists if that attribute
10564 -- has been specified or is available for an ancestor type; a default
10565 -- implementation of the attribute Output (resp. Input) exists if the
10566 -- attribute has been specified or Write (resp. Read) is available for
10567 -- an ancestor type. The last condition only applies under Ada 2005.
10569 if Is_Limited_Type
(Typ
) and then Is_Tagged_Type
(Typ
) then
10570 if Operation
= TSS_Stream_Read
then
10571 Has_Predefined_Or_Specified_Stream_Attribute
:=
10572 Has_Specified_Stream_Read
(Typ
);
10574 elsif Operation
= TSS_Stream_Write
then
10575 Has_Predefined_Or_Specified_Stream_Attribute
:=
10576 Has_Specified_Stream_Write
(Typ
);
10578 elsif Operation
= TSS_Stream_Input
then
10579 Has_Predefined_Or_Specified_Stream_Attribute
:=
10580 Has_Specified_Stream_Input
(Typ
)
10582 (Ada_Version
>= Ada_2005
10583 and then Stream_Operation_OK
(Typ
, TSS_Stream_Read
));
10585 elsif Operation
= TSS_Stream_Output
then
10586 Has_Predefined_Or_Specified_Stream_Attribute
:=
10587 Has_Specified_Stream_Output
(Typ
)
10589 (Ada_Version
>= Ada_2005
10590 and then Stream_Operation_OK
(Typ
, TSS_Stream_Write
));
10593 -- Case of inherited TSS_Stream_Read or TSS_Stream_Write
10595 if not Has_Predefined_Or_Specified_Stream_Attribute
10596 and then Is_Derived_Type
(Typ
)
10597 and then (Operation
= TSS_Stream_Read
10598 or else Operation
= TSS_Stream_Write
)
10600 Has_Predefined_Or_Specified_Stream_Attribute
:=
10602 (Find_Inherited_TSS
(Base_Type
(Etype
(Typ
)), Operation
));
10606 -- If the type is not limited, or else is limited but the attribute is
10607 -- explicitly specified or is predefined for the type, then return True,
10608 -- unless other conditions prevail, such as restrictions prohibiting
10609 -- streams or dispatching operations. We also return True for limited
10610 -- interfaces, because they may be extended by nonlimited types and
10611 -- permit inheritance in this case (addresses cases where an abstract
10612 -- extension doesn't get 'Input declared, as per comments below, but
10613 -- 'Class'Input must still be allowed). Note that attempts to apply
10614 -- stream attributes to a limited interface or its class-wide type
10615 -- (or limited extensions thereof) will still get properly rejected
10616 -- by Check_Stream_Attribute.
10618 -- We exclude the Input operation from being a predefined subprogram in
10619 -- the case where the associated type is an abstract extension, because
10620 -- the attribute is not callable in that case, per 13.13.2(49/2). Also,
10621 -- we don't want an abstract version created because types derived from
10622 -- the abstract type may not even have Input available (for example if
10623 -- derived from a private view of the abstract type that doesn't have
10624 -- a visible Input).
10626 -- Do not generate stream routines for type Finalization_Master because
10627 -- a master may never appear in types and therefore cannot be read or
10631 (not Is_Limited_Type
(Typ
)
10632 or else Is_Interface
(Typ
)
10633 or else Has_Predefined_Or_Specified_Stream_Attribute
)
10635 (Operation
/= TSS_Stream_Input
10636 or else not Is_Abstract_Type
(Typ
)
10637 or else not Is_Derived_Type
(Typ
))
10638 and then not Has_Unknown_Discriminants
(Typ
)
10640 (Is_Interface
(Typ
)
10642 (Is_Task_Interface
(Typ
)
10643 or else Is_Protected_Interface
(Typ
)
10644 or else Is_Synchronized_Interface
(Typ
)))
10645 and then not Restriction_Active
(No_Streams
)
10646 and then not Restriction_Active
(No_Dispatch
)
10647 and then No
(No_Tagged_Streams_Pragma
(Typ
))
10648 and then not No_Run_Time_Mode
10649 and then RTE_Available
(RE_Tag
)
10650 and then No
(Type_Without_Stream_Operation
(Typ
))
10651 and then RTE_Available
(RE_Root_Stream_Type
)
10652 and then not Is_RTE
(Typ
, RE_Finalization_Master
);
10653 end Stream_Operation_OK
;