1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2007, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree
; use Atree
;
27 with Checks
; use Checks
;
28 with Einfo
; use Einfo
;
29 with Errout
; use Errout
;
30 with Exp_Aggr
; use Exp_Aggr
;
31 with Exp_Atag
; use Exp_Atag
;
32 with Exp_Ch4
; use Exp_Ch4
;
33 with Exp_Ch6
; use Exp_Ch6
;
34 with Exp_Ch7
; use Exp_Ch7
;
35 with Exp_Ch9
; use Exp_Ch9
;
36 with Exp_Ch11
; use Exp_Ch11
;
37 with Exp_Disp
; use Exp_Disp
;
38 with Exp_Dist
; use Exp_Dist
;
39 with Exp_Smem
; use Exp_Smem
;
40 with Exp_Strm
; use Exp_Strm
;
41 with Exp_Tss
; use Exp_Tss
;
42 with Exp_Util
; use Exp_Util
;
43 with Freeze
; use Freeze
;
44 with Nlists
; use Nlists
;
45 with Namet
; use Namet
;
46 with Nmake
; use Nmake
;
48 with Restrict
; use Restrict
;
49 with Rident
; use Rident
;
50 with Rtsfind
; use Rtsfind
;
52 with Sem_Attr
; use Sem_Attr
;
53 with Sem_Cat
; use Sem_Cat
;
54 with Sem_Ch3
; use Sem_Ch3
;
55 with Sem_Ch8
; use Sem_Ch8
;
56 with Sem_Disp
; use Sem_Disp
;
57 with Sem_Eval
; use Sem_Eval
;
58 with Sem_Mech
; use Sem_Mech
;
59 with Sem_Res
; use Sem_Res
;
60 with Sem_Util
; use Sem_Util
;
61 with Sinfo
; use Sinfo
;
62 with Stand
; use Stand
;
63 with Snames
; use Snames
;
64 with Targparm
; use Targparm
;
65 with Tbuild
; use Tbuild
;
66 with Ttypes
; use Ttypes
;
67 with Validsw
; use Validsw
;
69 package body Exp_Ch3
is
71 -----------------------
72 -- Local Subprograms --
73 -----------------------
75 function Add_Final_Chain
(Def_Id
: Entity_Id
) return Entity_Id
;
76 -- Add the declaration of a finalization list to the freeze actions for
77 -- Def_Id, and return its defining identifier.
79 procedure Adjust_Discriminants
(Rtype
: Entity_Id
);
80 -- This is used when freezing a record type. It attempts to construct
81 -- more restrictive subtypes for discriminants so that the max size of
82 -- the record can be calculated more accurately. See the body of this
83 -- procedure for details.
85 procedure Build_Array_Init_Proc
(A_Type
: Entity_Id
; Nod
: Node_Id
);
86 -- Build initialization procedure for given array type. Nod is a node
87 -- used for attachment of any actions required in its construction.
88 -- It also supplies the source location used for the procedure.
90 function Build_Discriminant_Formals
92 Use_Dl
: Boolean) return List_Id
;
93 -- This function uses the discriminants of a type to build a list of
94 -- formal parameters, used in the following function. If the flag Use_Dl
95 -- is set, the list is built using the already defined discriminals
96 -- of the type. Otherwise new identifiers are created, with the source
97 -- names of the discriminants.
99 function Build_Equivalent_Array_Aggregate
(T
: Entity_Id
) return Node_Id
;
100 -- This function builds a static aggregate that can serve as the initial
101 -- value for an array type whose bounds are static, and whose component
102 -- type is a composite type that has a static equivalent aggregate.
103 -- The equivalent array aggregate is used both for object initialization
104 -- and for component initialization, when used in the following function.
106 function Build_Equivalent_Record_Aggregate
(T
: Entity_Id
) return Node_Id
;
107 -- This function builds a static aggregate that can serve as the initial
108 -- value for a record type whose components are scalar and initialized
109 -- with compile-time values, or arrays with similar initialization or
110 -- defaults. When possible, initialization of an object of the type can
111 -- be achieved by using a copy of the aggregate as an initial value, thus
112 -- removing the implicit call that would otherwise constitute elaboration
115 function Build_Master_Renaming
117 T
: Entity_Id
) return Entity_Id
;
118 -- If the designated type of an access type is a task type or contains
119 -- tasks, we make sure that a _Master variable is declared in the current
120 -- scope, and then declare a renaming for it:
122 -- atypeM : Master_Id renames _Master;
124 -- where atyp is the name of the access type. This declaration is used when
125 -- an allocator for the access type is expanded. The node is the full
126 -- declaration of the designated type that contains tasks. The renaming
127 -- declaration is inserted before N, and after the Master declaration.
129 procedure Build_Record_Init_Proc
(N
: Node_Id
; Pe
: Entity_Id
);
130 -- Build record initialization procedure. N is the type declaration
131 -- node, and Pe is the corresponding entity for the record type.
133 procedure Build_Slice_Assignment
(Typ
: Entity_Id
);
134 -- Build assignment procedure for one-dimensional arrays of controlled
135 -- types. Other array and slice assignments are expanded in-line, but
136 -- the code expansion for controlled components (when control actions
137 -- are active) can lead to very large blocks that GCC3 handles poorly.
139 procedure Build_Variant_Record_Equality
(Typ
: Entity_Id
);
140 -- Create An Equality function for the non-tagged variant record 'Typ'
141 -- and attach it to the TSS list
143 procedure Check_Stream_Attributes
(Typ
: Entity_Id
);
144 -- Check that if a limited extension has a parent with user-defined stream
145 -- attributes, and does not itself have user-defined stream-attributes,
146 -- then any limited component of the extension also has the corresponding
147 -- user-defined stream attributes.
149 procedure Clean_Task_Names
151 Proc_Id
: Entity_Id
);
152 -- If an initialization procedure includes calls to generate names
153 -- for task subcomponents, indicate that secondary stack cleanup is
154 -- needed after an initialization. Typ is the component type, and Proc_Id
155 -- the initialization procedure for the enclosing composite type.
157 procedure Expand_Tagged_Root
(T
: Entity_Id
);
158 -- Add a field _Tag at the beginning of the record. This field carries
159 -- the value of the access to the Dispatch table. This procedure is only
160 -- called on root type, the _Tag field being inherited by the descendants.
162 procedure Expand_Record_Controller
(T
: Entity_Id
);
163 -- T must be a record type that Has_Controlled_Component. Add a field
164 -- _controller of type Record_Controller or Limited_Record_Controller
167 procedure Freeze_Array_Type
(N
: Node_Id
);
168 -- Freeze an array type. Deals with building the initialization procedure,
169 -- creating the packed array type for a packed array and also with the
170 -- creation of the controlling procedures for the controlled case. The
171 -- argument N is the N_Freeze_Entity node for the type.
173 procedure Freeze_Enumeration_Type
(N
: Node_Id
);
174 -- Freeze enumeration type with non-standard representation. Builds the
175 -- array and function needed to convert between enumeration pos and
176 -- enumeration representation values. N is the N_Freeze_Entity node
179 procedure Freeze_Record_Type
(N
: Node_Id
);
180 -- Freeze record type. Builds all necessary discriminant checking
181 -- and other ancillary functions, and builds dispatch tables where
182 -- needed. The argument N is the N_Freeze_Entity node. This processing
183 -- applies only to E_Record_Type entities, not to class wide types,
184 -- record subtypes, or private types.
186 procedure Freeze_Stream_Operations
(N
: Node_Id
; Typ
: Entity_Id
);
187 -- Treat user-defined stream operations as renaming_as_body if the
188 -- subprogram they rename is not frozen when the type is frozen.
190 procedure Initialization_Warning
(E
: Entity_Id
);
191 -- If static elaboration of the package is requested, indicate
192 -- when a type does meet the conditions for static initialization. If
193 -- E is a type, it has components that have no static initialization.
194 -- if E is an entity, its initial expression is not compile-time known.
196 function Init_Formals
(Typ
: Entity_Id
) return List_Id
;
197 -- This function builds the list of formals for an initialization routine.
198 -- The first formal is always _Init with the given type. For task value
199 -- record types and types containing tasks, three additional formals are
202 -- _Master : Master_Id
203 -- _Chain : in out Activation_Chain
204 -- _Task_Name : String
206 -- The caller must append additional entries for discriminants if required.
208 function In_Runtime
(E
: Entity_Id
) return Boolean;
209 -- Check if E is defined in the RTL (in a child of Ada or System). Used
210 -- to avoid to bring in the overhead of _Input, _Output for tagged types.
212 function Is_Variable_Size_Record
(E
: Entity_Id
) return Boolean;
213 -- Returns true if E has variable size components
215 function Make_Eq_Case
218 Discr
: Entity_Id
:= Empty
) return List_Id
;
219 -- Building block for variant record equality. Defined to share the code
220 -- between the tagged and non-tagged 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
224 -- generated code. Discr is used as the case statement switch in the case
225 -- of Unchecked_Union equality.
229 L
: List_Id
) return Node_Id
;
230 -- Building block for variant record equality. Defined to share the code
231 -- between the tagged and non-tagged case. Given the list of components
232 -- (or discriminants) L, it generates a return statement that compares all
233 -- components of local temporaries named X and Y (that are declared as
234 -- formals at some upper level). E provides the Sloc to be used for the
237 procedure Make_Predefined_Primitive_Specs
238 (Tag_Typ
: Entity_Id
;
239 Predef_List
: out List_Id
;
240 Renamed_Eq
: out Entity_Id
);
241 -- Create a list with the specs of the predefined primitive operations.
242 -- For tagged types that are interfaces all these primitives are defined
245 -- The following entries are present for all tagged types, and provide
246 -- the results of the corresponding attribute applied to the object.
247 -- Dispatching is required in general, since the result of the attribute
248 -- will vary with the actual object subtype.
250 -- _alignment provides result of 'Alignment attribute
251 -- _size provides result of 'Size attribute
252 -- typSR provides result of 'Read attribute
253 -- typSW provides result of 'Write attribute
254 -- typSI provides result of 'Input attribute
255 -- typSO provides result of 'Output attribute
257 -- The following entries are additionally present for non-limited tagged
258 -- types, and implement additional dispatching operations for predefined
261 -- _equality implements "=" operator
262 -- _assign implements assignment operation
263 -- typDF implements deep finalization
264 -- typDA implements deep adjust
266 -- The latter two are empty procedures unless the type contains some
267 -- controlled components that require finalization actions (the deep
268 -- in the name refers to the fact that the action applies to components).
270 -- The list is returned in Predef_List. The Parameter Renamed_Eq either
271 -- returns the value Empty, or else the defining unit name for the
272 -- predefined equality function in the case where the type has a primitive
273 -- operation that is a renaming of predefined equality (but only if there
274 -- is also an overriding user-defined equality function). The returned
275 -- Renamed_Eq will be passed to the corresponding parameter of
276 -- Predefined_Primitive_Bodies.
278 function Has_New_Non_Standard_Rep
(T
: Entity_Id
) return Boolean;
279 -- returns True if there are representation clauses for type T that are not
280 -- inherited. If the result is false, the init_proc and the discriminant
281 -- checking functions of the parent can be reused by a derived type.
283 procedure Make_Controlling_Function_Wrappers
284 (Tag_Typ
: Entity_Id
;
285 Decl_List
: out List_Id
;
286 Body_List
: out List_Id
);
287 -- Ada 2005 (AI-391): Makes specs and bodies for the wrapper functions
288 -- associated with inherited functions with controlling results which
289 -- are not overridden. The body of each wrapper function consists solely
290 -- of a return statement whose expression is an extension aggregate
291 -- invoking the inherited subprogram's parent subprogram and extended
292 -- with a null association list.
294 procedure Make_Null_Procedure_Specs
295 (Tag_Typ
: Entity_Id
;
296 Decl_List
: out List_Id
);
297 -- Ada 2005 (AI-251): Makes specs for null procedures associated with any
298 -- null procedures inherited from an interface type that have not been
299 -- overridden. Only one null procedure will be created for a given set of
300 -- inherited null procedures with homographic profiles.
302 function Predef_Spec_Or_Body
307 Ret_Type
: Entity_Id
:= Empty
;
308 For_Body
: Boolean := False) return Node_Id
;
309 -- This function generates the appropriate expansion for a predefined
310 -- primitive operation specified by its name, parameter profile and
311 -- return type (Empty means this is a procedure). If For_Body is false,
312 -- then the returned node is a subprogram declaration. If For_Body is
313 -- true, then the returned node is a empty subprogram body containing
314 -- no declarations and no statements.
316 function Predef_Stream_Attr_Spec
319 Name
: TSS_Name_Type
;
320 For_Body
: Boolean := False) return Node_Id
;
321 -- Specialized version of Predef_Spec_Or_Body that apply to read, write,
322 -- input and output attribute whose specs are constructed in Exp_Strm.
324 function Predef_Deep_Spec
327 Name
: TSS_Name_Type
;
328 For_Body
: Boolean := False) return Node_Id
;
329 -- Specialized version of Predef_Spec_Or_Body that apply to _deep_adjust
330 -- and _deep_finalize
332 function Predefined_Primitive_Bodies
333 (Tag_Typ
: Entity_Id
;
334 Renamed_Eq
: Entity_Id
) return List_Id
;
335 -- Create the bodies of the predefined primitives that are described in
336 -- Predefined_Primitive_Specs. When not empty, Renamed_Eq must denote
337 -- the defining unit name of the type's predefined equality as returned
338 -- by Make_Predefined_Primitive_Specs.
340 function Predefined_Primitive_Freeze
(Tag_Typ
: Entity_Id
) return List_Id
;
341 -- Freeze entities of all predefined primitive operations. This is needed
342 -- because the bodies of these operations do not normally do any freezing.
344 function Stream_Operation_OK
346 Operation
: TSS_Name_Type
) return Boolean;
347 -- Check whether the named stream operation must be emitted for a given
348 -- type. The rules for inheritance of stream attributes by type extensions
349 -- are enforced by this function. Furthermore, various restrictions prevent
350 -- the generation of these operations, as a useful optimization or for
351 -- certification purposes.
353 ---------------------
354 -- Add_Final_Chain --
355 ---------------------
357 function Add_Final_Chain
(Def_Id
: Entity_Id
) return Entity_Id
is
358 Loc
: constant Source_Ptr
:= Sloc
(Def_Id
);
363 Make_Defining_Identifier
(Loc
,
364 New_External_Name
(Chars
(Def_Id
), 'L'));
366 Append_Freeze_Action
(Def_Id
,
367 Make_Object_Declaration
(Loc
,
368 Defining_Identifier
=> Flist
,
370 New_Reference_To
(RTE
(RE_List_Controller
), Loc
)));
375 --------------------------
376 -- Adjust_Discriminants --
377 --------------------------
379 -- This procedure attempts to define subtypes for discriminants that are
380 -- more restrictive than those declared. Such a replacement is possible if
381 -- we can demonstrate that values outside the restricted range would cause
382 -- constraint errors in any case. The advantage of restricting the
383 -- discriminant types in this way is that the maximum size of the variant
384 -- record can be calculated more conservatively.
386 -- An example of a situation in which we can perform this type of
387 -- restriction is the following:
389 -- subtype B is range 1 .. 10;
390 -- type Q is array (B range <>) of Integer;
392 -- type V (N : Natural) is record
396 -- In this situation, we can restrict the upper bound of N to 10, since
397 -- any larger value would cause a constraint error in any case.
399 -- There are many situations in which such restriction is possible, but
400 -- for now, we just look for cases like the above, where the component
401 -- in question is a one dimensional array whose upper bound is one of
402 -- the record discriminants. Also the component must not be part of
403 -- any variant part, since then the component does not always exist.
405 procedure Adjust_Discriminants
(Rtype
: Entity_Id
) is
406 Loc
: constant Source_Ptr
:= Sloc
(Rtype
);
423 Comp
:= First_Component
(Rtype
);
424 while Present
(Comp
) loop
426 -- If our parent is a variant, quit, we do not look at components
427 -- that are in variant parts, because they may not always exist.
429 P
:= Parent
(Comp
); -- component declaration
430 P
:= Parent
(P
); -- component list
432 exit when Nkind
(Parent
(P
)) = N_Variant
;
434 -- We are looking for a one dimensional array type
436 Ctyp
:= Etype
(Comp
);
438 if not Is_Array_Type
(Ctyp
)
439 or else Number_Dimensions
(Ctyp
) > 1
444 -- The lower bound must be constant, and the upper bound is a
445 -- discriminant (which is a discriminant of the current record).
447 Ityp
:= Etype
(First_Index
(Ctyp
));
448 Lo
:= Type_Low_Bound
(Ityp
);
449 Hi
:= Type_High_Bound
(Ityp
);
451 if not Compile_Time_Known_Value
(Lo
)
452 or else Nkind
(Hi
) /= N_Identifier
453 or else No
(Entity
(Hi
))
454 or else Ekind
(Entity
(Hi
)) /= E_Discriminant
459 -- We have an array with appropriate bounds
461 Loval
:= Expr_Value
(Lo
);
462 Discr
:= Entity
(Hi
);
463 Dtyp
:= Etype
(Discr
);
465 -- See if the discriminant has a known upper bound
467 Dhi
:= Type_High_Bound
(Dtyp
);
469 if not Compile_Time_Known_Value
(Dhi
) then
473 Dhiv
:= Expr_Value
(Dhi
);
475 -- See if base type of component array has known upper bound
477 Ahi
:= Type_High_Bound
(Etype
(First_Index
(Base_Type
(Ctyp
))));
479 if not Compile_Time_Known_Value
(Ahi
) then
483 Ahiv
:= Expr_Value
(Ahi
);
485 -- The condition for doing the restriction is that the high bound
486 -- of the discriminant is greater than the low bound of the array,
487 -- and is also greater than the high bound of the base type index.
489 if Dhiv
> Loval
and then Dhiv
> Ahiv
then
491 -- We can reset the upper bound of the discriminant type to
492 -- whichever is larger, the low bound of the component, or
493 -- the high bound of the base type array index.
495 -- We build a subtype that is declared as
497 -- subtype Tnn is discr_type range discr_type'First .. max;
499 -- And insert this declaration into the tree. The type of the
500 -- discriminant is then reset to this more restricted subtype.
502 Tnn
:= Make_Defining_Identifier
(Loc
, New_Internal_Name
('T'));
504 Insert_Action
(Declaration_Node
(Rtype
),
505 Make_Subtype_Declaration
(Loc
,
506 Defining_Identifier
=> Tnn
,
507 Subtype_Indication
=>
508 Make_Subtype_Indication
(Loc
,
509 Subtype_Mark
=> New_Occurrence_Of
(Dtyp
, Loc
),
511 Make_Range_Constraint
(Loc
,
515 Make_Attribute_Reference
(Loc
,
516 Attribute_Name
=> Name_First
,
517 Prefix
=> New_Occurrence_Of
(Dtyp
, Loc
)),
519 Make_Integer_Literal
(Loc
,
520 Intval
=> UI_Max
(Loval
, Ahiv
)))))));
522 Set_Etype
(Discr
, Tnn
);
526 Next_Component
(Comp
);
528 end Adjust_Discriminants
;
530 ---------------------------
531 -- Build_Array_Init_Proc --
532 ---------------------------
534 procedure Build_Array_Init_Proc
(A_Type
: Entity_Id
; Nod
: Node_Id
) is
535 Loc
: constant Source_Ptr
:= Sloc
(Nod
);
536 Comp_Type
: constant Entity_Id
:= Component_Type
(A_Type
);
537 Index_List
: List_Id
;
539 Body_Stmts
: List_Id
;
541 function Init_Component
return List_Id
;
542 -- Create one statement to initialize one array component, designated
543 -- by a full set of indices.
545 function Init_One_Dimension
(N
: Int
) return List_Id
;
546 -- Create loop to initialize one dimension of the array. The single
547 -- statement in the loop body initializes the inner dimensions if any,
548 -- or else the single component. Note that this procedure is called
549 -- recursively, with N being the dimension to be initialized. A call
550 -- with N greater than the number of dimensions simply generates the
551 -- component initialization, terminating the recursion.
557 function Init_Component
return List_Id
is
562 Make_Indexed_Component
(Loc
,
563 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
564 Expressions
=> Index_List
);
566 if Needs_Simple_Initialization
(Comp_Type
) then
567 Set_Assignment_OK
(Comp
);
569 Make_Assignment_Statement
(Loc
,
573 (Comp_Type
, Loc
, Component_Size
(A_Type
))));
576 Clean_Task_Names
(Comp_Type
, Proc_Id
);
578 Build_Initialization_Call
579 (Loc
, Comp
, Comp_Type
,
580 In_Init_Proc
=> True,
581 Enclos_Type
=> A_Type
);
585 ------------------------
586 -- Init_One_Dimension --
587 ------------------------
589 function Init_One_Dimension
(N
: Int
) return List_Id
is
593 -- If the component does not need initializing, then there is nothing
594 -- to do here, so we return a null body. This occurs when generating
595 -- the dummy Init_Proc needed for Initialize_Scalars processing.
597 if not Has_Non_Null_Base_Init_Proc
(Comp_Type
)
598 and then not Needs_Simple_Initialization
(Comp_Type
)
599 and then not Has_Task
(Comp_Type
)
601 return New_List
(Make_Null_Statement
(Loc
));
603 -- If all dimensions dealt with, we simply initialize the component
605 elsif N
> Number_Dimensions
(A_Type
) then
606 return Init_Component
;
608 -- Here we generate the required loop
612 Make_Defining_Identifier
(Loc
, New_External_Name
('J', N
));
614 Append
(New_Reference_To
(Index
, Loc
), Index_List
);
617 Make_Implicit_Loop_Statement
(Nod
,
620 Make_Iteration_Scheme
(Loc
,
621 Loop_Parameter_Specification
=>
622 Make_Loop_Parameter_Specification
(Loc
,
623 Defining_Identifier
=> Index
,
624 Discrete_Subtype_Definition
=>
625 Make_Attribute_Reference
(Loc
,
626 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
627 Attribute_Name
=> Name_Range
,
628 Expressions
=> New_List
(
629 Make_Integer_Literal
(Loc
, N
))))),
630 Statements
=> Init_One_Dimension
(N
+ 1)));
632 end Init_One_Dimension
;
634 -- Start of processing for Build_Array_Init_Proc
637 -- Nothing to generate in the following cases:
639 -- 1. Initialization is suppressed for the type
640 -- 2. The type is a value type, in the CIL sense.
641 -- 3. An initialization already exists for the base type
643 if Suppress_Init_Proc
(A_Type
)
644 or else Is_Value_Type
(Comp_Type
)
645 or else Present
(Base_Init_Proc
(A_Type
))
650 Index_List
:= New_List
;
652 -- We need an initialization procedure if any of the following is true:
654 -- 1. The component type has an initialization procedure
655 -- 2. The component type needs simple initialization
656 -- 3. Tasks are present
657 -- 4. The type is marked as a public entity
659 -- The reason for the public entity test is to deal properly with the
660 -- Initialize_Scalars pragma. This pragma can be set in the client and
661 -- not in the declaring package, this means the client will make a call
662 -- to the initialization procedure (because one of conditions 1-3 must
663 -- apply in this case), and we must generate a procedure (even if it is
664 -- null) to satisfy the call in this case.
666 -- Exception: do not build an array init_proc for a type whose root
667 -- type is Standard.String or Standard.Wide_[Wide_]String, since there
668 -- is no place to put the code, and in any case we handle initialization
669 -- of such types (in the Initialize_Scalars case, that's the only time
670 -- the issue arises) in a special manner anyway which does not need an
673 if Has_Non_Null_Base_Init_Proc
(Comp_Type
)
674 or else Needs_Simple_Initialization
(Comp_Type
)
675 or else Has_Task
(Comp_Type
)
676 or else (not Restriction_Active
(No_Initialize_Scalars
)
677 and then Is_Public
(A_Type
)
678 and then Root_Type
(A_Type
) /= Standard_String
679 and then Root_Type
(A_Type
) /= Standard_Wide_String
680 and then Root_Type
(A_Type
) /= Standard_Wide_Wide_String
)
683 Make_Defining_Identifier
(Loc
, Make_Init_Proc_Name
(A_Type
));
685 Body_Stmts
:= Init_One_Dimension
(1);
688 Make_Subprogram_Body
(Loc
,
690 Make_Procedure_Specification
(Loc
,
691 Defining_Unit_Name
=> Proc_Id
,
692 Parameter_Specifications
=> Init_Formals
(A_Type
)),
693 Declarations
=> New_List
,
694 Handled_Statement_Sequence
=>
695 Make_Handled_Sequence_Of_Statements
(Loc
,
696 Statements
=> Body_Stmts
)));
698 Set_Ekind
(Proc_Id
, E_Procedure
);
699 Set_Is_Public
(Proc_Id
, Is_Public
(A_Type
));
700 Set_Is_Internal
(Proc_Id
);
701 Set_Has_Completion
(Proc_Id
);
703 if not Debug_Generated_Code
then
704 Set_Debug_Info_Off
(Proc_Id
);
707 -- Set inlined unless controlled stuff or tasks around, in which
708 -- case we do not want to inline, because nested stuff may cause
709 -- difficulties in inter-unit inlining, and furthermore there is
710 -- in any case no point in inlining such complex init procs.
712 if not Has_Task
(Proc_Id
)
713 and then not Controlled_Type
(Proc_Id
)
715 Set_Is_Inlined
(Proc_Id
);
718 -- Associate Init_Proc with type, and determine if the procedure
719 -- is null (happens because of the Initialize_Scalars pragma case,
720 -- where we have to generate a null procedure in case it is called
721 -- by a client with Initialize_Scalars set). Such procedures have
722 -- to be generated, but do not have to be called, so we mark them
723 -- as null to suppress the call.
725 Set_Init_Proc
(A_Type
, Proc_Id
);
727 if List_Length
(Body_Stmts
) = 1
728 and then Nkind
(First
(Body_Stmts
)) = N_Null_Statement
730 Set_Is_Null_Init_Proc
(Proc_Id
);
733 -- Try to build a static aggregate to initialize statically
734 -- objects of the type. This can only be done for constrained
735 -- one-dimensional arrays with static bounds.
737 Set_Static_Initialization
739 Build_Equivalent_Array_Aggregate
(First_Subtype
(A_Type
)));
742 end Build_Array_Init_Proc
;
744 -----------------------------
745 -- Build_Class_Wide_Master --
746 -----------------------------
748 procedure Build_Class_Wide_Master
(T
: Entity_Id
) is
749 Loc
: constant Source_Ptr
:= Sloc
(T
);
756 -- Nothing to do if there is no task hierarchy
758 if Restriction_Active
(No_Task_Hierarchy
) then
762 -- Find declaration that created the access type: either a type
763 -- declaration, or an object declaration with an access definition,
764 -- in which case the type is anonymous.
767 P
:= Associated_Node_For_Itype
(T
);
772 -- Nothing to do if we already built a master entity for this scope
774 if not Has_Master_Entity
(Scope
(T
)) then
776 -- First build the master entity
777 -- _Master : constant Master_Id := Current_Master.all;
778 -- and insert it just before the current declaration.
781 Make_Object_Declaration
(Loc
,
782 Defining_Identifier
=>
783 Make_Defining_Identifier
(Loc
, Name_uMaster
),
784 Constant_Present
=> True,
785 Object_Definition
=> New_Reference_To
(Standard_Integer
, Loc
),
787 Make_Explicit_Dereference
(Loc
,
788 New_Reference_To
(RTE
(RE_Current_Master
), Loc
)));
790 Insert_Action
(P
, Decl
);
792 Set_Has_Master_Entity
(Scope
(T
));
794 -- Now mark the containing scope as a task master
797 while Nkind
(Par
) /= N_Compilation_Unit
loop
800 -- If we fall off the top, we are at the outer level, and the
801 -- environment task is our effective master, so nothing to mark.
804 (Par
, N_Task_Body
, N_Block_Statement
, N_Subprogram_Body
)
806 Set_Is_Task_Master
(Par
, True);
812 -- Now define the renaming of the master_id
815 Make_Defining_Identifier
(Loc
,
816 New_External_Name
(Chars
(T
), 'M'));
819 Make_Object_Renaming_Declaration
(Loc
,
820 Defining_Identifier
=> M_Id
,
821 Subtype_Mark
=> New_Reference_To
(Standard_Integer
, Loc
),
822 Name
=> Make_Identifier
(Loc
, Name_uMaster
));
823 Insert_Before
(P
, Decl
);
826 Set_Master_Id
(T
, M_Id
);
829 when RE_Not_Available
=>
831 end Build_Class_Wide_Master
;
833 --------------------------------
834 -- Build_Discr_Checking_Funcs --
835 --------------------------------
837 procedure Build_Discr_Checking_Funcs
(N
: Node_Id
) is
840 Enclosing_Func_Id
: Entity_Id
;
845 function Build_Case_Statement
846 (Case_Id
: Entity_Id
;
847 Variant
: Node_Id
) return Node_Id
;
848 -- Build a case statement containing only two alternatives. The first
849 -- alternative corresponds exactly to the discrete choices given on the
850 -- variant with contains the components that we are generating the
851 -- checks for. If the discriminant is one of these return False. The
852 -- second alternative is an OTHERS choice that will return True
853 -- indicating the discriminant did not match.
855 function Build_Dcheck_Function
856 (Case_Id
: Entity_Id
;
857 Variant
: Node_Id
) return Entity_Id
;
858 -- Build the discriminant checking function for a given variant
860 procedure Build_Dcheck_Functions
(Variant_Part_Node
: Node_Id
);
861 -- Builds the discriminant checking function for each variant of the
862 -- given variant part of the record type.
864 --------------------------
865 -- Build_Case_Statement --
866 --------------------------
868 function Build_Case_Statement
869 (Case_Id
: Entity_Id
;
870 Variant
: Node_Id
) return Node_Id
872 Alt_List
: constant List_Id
:= New_List
;
873 Actuals_List
: List_Id
;
875 Case_Alt_Node
: Node_Id
;
877 Choice_List
: List_Id
;
879 Return_Node
: Node_Id
;
882 Case_Node
:= New_Node
(N_Case_Statement
, Loc
);
884 -- Replace the discriminant which controls the variant, with the name
885 -- of the formal of the checking function.
887 Set_Expression
(Case_Node
,
888 Make_Identifier
(Loc
, Chars
(Case_Id
)));
890 Choice
:= First
(Discrete_Choices
(Variant
));
892 if Nkind
(Choice
) = N_Others_Choice
then
893 Choice_List
:= New_Copy_List
(Others_Discrete_Choices
(Choice
));
895 Choice_List
:= New_Copy_List
(Discrete_Choices
(Variant
));
898 if not Is_Empty_List
(Choice_List
) then
899 Case_Alt_Node
:= New_Node
(N_Case_Statement_Alternative
, Loc
);
900 Set_Discrete_Choices
(Case_Alt_Node
, Choice_List
);
902 -- In case this is a nested variant, we need to return the result
903 -- of the discriminant checking function for the immediately
904 -- enclosing variant.
906 if Present
(Enclosing_Func_Id
) then
907 Actuals_List
:= New_List
;
909 D
:= First_Discriminant
(Rec_Id
);
910 while Present
(D
) loop
911 Append
(Make_Identifier
(Loc
, Chars
(D
)), Actuals_List
);
912 Next_Discriminant
(D
);
916 Make_Simple_Return_Statement
(Loc
,
918 Make_Function_Call
(Loc
,
920 New_Reference_To
(Enclosing_Func_Id
, Loc
),
921 Parameter_Associations
=>
926 Make_Simple_Return_Statement
(Loc
,
928 New_Reference_To
(Standard_False
, Loc
));
931 Set_Statements
(Case_Alt_Node
, New_List
(Return_Node
));
932 Append
(Case_Alt_Node
, Alt_List
);
935 Case_Alt_Node
:= New_Node
(N_Case_Statement_Alternative
, Loc
);
936 Choice_List
:= New_List
(New_Node
(N_Others_Choice
, Loc
));
937 Set_Discrete_Choices
(Case_Alt_Node
, Choice_List
);
940 Make_Simple_Return_Statement
(Loc
,
942 New_Reference_To
(Standard_True
, Loc
));
944 Set_Statements
(Case_Alt_Node
, New_List
(Return_Node
));
945 Append
(Case_Alt_Node
, Alt_List
);
947 Set_Alternatives
(Case_Node
, Alt_List
);
949 end Build_Case_Statement
;
951 ---------------------------
952 -- Build_Dcheck_Function --
953 ---------------------------
955 function Build_Dcheck_Function
956 (Case_Id
: Entity_Id
;
957 Variant
: Node_Id
) return Entity_Id
961 Parameter_List
: List_Id
;
965 Body_Node
:= New_Node
(N_Subprogram_Body
, Loc
);
966 Sequence
:= Sequence
+ 1;
969 Make_Defining_Identifier
(Loc
,
970 Chars
=> New_External_Name
(Chars
(Rec_Id
), 'D', Sequence
));
972 Spec_Node
:= New_Node
(N_Function_Specification
, Loc
);
973 Set_Defining_Unit_Name
(Spec_Node
, Func_Id
);
975 Parameter_List
:= Build_Discriminant_Formals
(Rec_Id
, False);
977 Set_Parameter_Specifications
(Spec_Node
, Parameter_List
);
978 Set_Result_Definition
(Spec_Node
,
979 New_Reference_To
(Standard_Boolean
, Loc
));
980 Set_Specification
(Body_Node
, Spec_Node
);
981 Set_Declarations
(Body_Node
, New_List
);
983 Set_Handled_Statement_Sequence
(Body_Node
,
984 Make_Handled_Sequence_Of_Statements
(Loc
,
985 Statements
=> New_List
(
986 Build_Case_Statement
(Case_Id
, Variant
))));
988 Set_Ekind
(Func_Id
, E_Function
);
989 Set_Mechanism
(Func_Id
, Default_Mechanism
);
990 Set_Is_Inlined
(Func_Id
, True);
991 Set_Is_Pure
(Func_Id
, True);
992 Set_Is_Public
(Func_Id
, Is_Public
(Rec_Id
));
993 Set_Is_Internal
(Func_Id
, True);
995 if not Debug_Generated_Code
then
996 Set_Debug_Info_Off
(Func_Id
);
1001 Append_Freeze_Action
(Rec_Id
, Body_Node
);
1002 Set_Dcheck_Function
(Variant
, Func_Id
);
1004 end Build_Dcheck_Function
;
1006 ----------------------------
1007 -- Build_Dcheck_Functions --
1008 ----------------------------
1010 procedure Build_Dcheck_Functions
(Variant_Part_Node
: Node_Id
) is
1011 Component_List_Node
: Node_Id
;
1013 Discr_Name
: Entity_Id
;
1014 Func_Id
: Entity_Id
;
1016 Saved_Enclosing_Func_Id
: Entity_Id
;
1019 -- Build the discriminant checking function for each variant, label
1020 -- all components of that variant with the function's name.
1022 Discr_Name
:= Entity
(Name
(Variant_Part_Node
));
1023 Variant
:= First_Non_Pragma
(Variants
(Variant_Part_Node
));
1025 while Present
(Variant
) loop
1026 Func_Id
:= Build_Dcheck_Function
(Discr_Name
, Variant
);
1027 Component_List_Node
:= Component_List
(Variant
);
1029 if not Null_Present
(Component_List_Node
) then
1031 First_Non_Pragma
(Component_Items
(Component_List_Node
));
1033 while Present
(Decl
) loop
1034 Set_Discriminant_Checking_Func
1035 (Defining_Identifier
(Decl
), Func_Id
);
1037 Next_Non_Pragma
(Decl
);
1040 if Present
(Variant_Part
(Component_List_Node
)) then
1041 Saved_Enclosing_Func_Id
:= Enclosing_Func_Id
;
1042 Enclosing_Func_Id
:= Func_Id
;
1043 Build_Dcheck_Functions
(Variant_Part
(Component_List_Node
));
1044 Enclosing_Func_Id
:= Saved_Enclosing_Func_Id
;
1048 Next_Non_Pragma
(Variant
);
1050 end Build_Dcheck_Functions
;
1052 -- Start of processing for Build_Discr_Checking_Funcs
1055 -- Only build if not done already
1057 if not Discr_Check_Funcs_Built
(N
) then
1058 Type_Def
:= Type_Definition
(N
);
1060 if Nkind
(Type_Def
) = N_Record_Definition
then
1061 if No
(Component_List
(Type_Def
)) then -- null record.
1064 V
:= Variant_Part
(Component_List
(Type_Def
));
1067 else pragma Assert
(Nkind
(Type_Def
) = N_Derived_Type_Definition
);
1068 if No
(Component_List
(Record_Extension_Part
(Type_Def
))) then
1072 (Component_List
(Record_Extension_Part
(Type_Def
)));
1076 Rec_Id
:= Defining_Identifier
(N
);
1078 if Present
(V
) and then not Is_Unchecked_Union
(Rec_Id
) then
1080 Enclosing_Func_Id
:= Empty
;
1081 Build_Dcheck_Functions
(V
);
1084 Set_Discr_Check_Funcs_Built
(N
);
1086 end Build_Discr_Checking_Funcs
;
1088 --------------------------------
1089 -- Build_Discriminant_Formals --
1090 --------------------------------
1092 function Build_Discriminant_Formals
1093 (Rec_Id
: Entity_Id
;
1094 Use_Dl
: Boolean) return List_Id
1096 Loc
: Source_Ptr
:= Sloc
(Rec_Id
);
1097 Parameter_List
: constant List_Id
:= New_List
;
1100 Param_Spec_Node
: Node_Id
;
1103 if Has_Discriminants
(Rec_Id
) then
1104 D
:= First_Discriminant
(Rec_Id
);
1105 while Present
(D
) loop
1109 Formal
:= Discriminal
(D
);
1111 Formal
:= Make_Defining_Identifier
(Loc
, Chars
(D
));
1115 Make_Parameter_Specification
(Loc
,
1116 Defining_Identifier
=> Formal
,
1118 New_Reference_To
(Etype
(D
), Loc
));
1119 Append
(Param_Spec_Node
, Parameter_List
);
1120 Next_Discriminant
(D
);
1124 return Parameter_List
;
1125 end Build_Discriminant_Formals
;
1127 --------------------------------------
1128 -- Build_Equivalent_Array_Aggregate --
1129 --------------------------------------
1131 function Build_Equivalent_Array_Aggregate
(T
: Entity_Id
) return Node_Id
is
1132 Loc
: constant Source_Ptr
:= Sloc
(T
);
1133 Comp_Type
: constant Entity_Id
:= Component_Type
(T
);
1134 Index_Type
: constant Entity_Id
:= Etype
(First_Index
(T
));
1135 Proc
: constant Entity_Id
:= Base_Init_Proc
(T
);
1141 if not Is_Constrained
(T
)
1142 or else Number_Dimensions
(T
) > 1
1145 Initialization_Warning
(T
);
1149 Lo
:= Type_Low_Bound
(Index_Type
);
1150 Hi
:= Type_High_Bound
(Index_Type
);
1152 if not Compile_Time_Known_Value
(Lo
)
1153 or else not Compile_Time_Known_Value
(Hi
)
1155 Initialization_Warning
(T
);
1159 if Is_Record_Type
(Comp_Type
)
1160 and then Present
(Base_Init_Proc
(Comp_Type
))
1162 Expr
:= Static_Initialization
(Base_Init_Proc
(Comp_Type
));
1165 Initialization_Warning
(T
);
1170 Initialization_Warning
(T
);
1174 Aggr
:= Make_Aggregate
(Loc
, No_List
, New_List
);
1175 Set_Etype
(Aggr
, T
);
1176 Set_Aggregate_Bounds
(Aggr
,
1178 Low_Bound
=> New_Copy
(Lo
),
1179 High_Bound
=> New_Copy
(Hi
)));
1180 Set_Parent
(Aggr
, Parent
(Proc
));
1182 Append_To
(Component_Associations
(Aggr
),
1183 Make_Component_Association
(Loc
,
1187 Low_Bound
=> New_Copy
(Lo
),
1188 High_Bound
=> New_Copy
(Hi
))),
1189 Expression
=> Expr
));
1191 if Static_Array_Aggregate
(Aggr
) then
1194 Initialization_Warning
(T
);
1197 end Build_Equivalent_Array_Aggregate
;
1199 ---------------------------------------
1200 -- Build_Equivalent_Record_Aggregate --
1201 ---------------------------------------
1203 function Build_Equivalent_Record_Aggregate
(T
: Entity_Id
) return Node_Id
is
1207 -- Start of processing for Build_Equivalent_Record_Aggregate
1210 if not Is_Record_Type
(T
)
1211 or else Has_Discriminants
(T
)
1212 or else Is_Limited_Type
(T
)
1213 or else Has_Non_Standard_Rep
(T
)
1215 Initialization_Warning
(T
);
1219 Comp
:= First_Component
(T
);
1221 -- A null record needs no warning
1227 while Present
(Comp
) loop
1229 -- Array components are acceptable if initialized by a positional
1230 -- aggregate with static components.
1232 if Is_Array_Type
(Etype
(Comp
)) then
1234 Comp_Type
: constant Entity_Id
:= Component_Type
(Etype
(Comp
));
1237 if Nkind
(Parent
(Comp
)) /= N_Component_Declaration
1238 or else No
(Expression
(Parent
(Comp
)))
1239 or else Nkind
(Expression
(Parent
(Comp
))) /= N_Aggregate
1241 Initialization_Warning
(T
);
1244 elsif Is_Scalar_Type
(Component_Type
(Etype
(Comp
)))
1246 (not Compile_Time_Known_Value
(Type_Low_Bound
(Comp_Type
))
1247 or else not Compile_Time_Known_Value
1248 (Type_High_Bound
(Comp_Type
)))
1250 Initialization_Warning
(T
);
1254 not Static_Array_Aggregate
(Expression
(Parent
(Comp
)))
1256 Initialization_Warning
(T
);
1261 elsif Is_Scalar_Type
(Etype
(Comp
)) then
1262 if Nkind
(Parent
(Comp
)) /= N_Component_Declaration
1263 or else No
(Expression
(Parent
(Comp
)))
1264 or else not Compile_Time_Known_Value
(Expression
(Parent
(Comp
)))
1266 Initialization_Warning
(T
);
1270 -- For now, other types are excluded
1273 Initialization_Warning
(T
);
1277 Next_Component
(Comp
);
1280 -- All components have static initialization. Build positional
1281 -- aggregate from the given expressions or defaults.
1283 Agg
:= Make_Aggregate
(Sloc
(T
), New_List
, New_List
);
1284 Set_Parent
(Agg
, Parent
(T
));
1286 Comp
:= First_Component
(T
);
1287 while Present
(Comp
) loop
1289 (New_Copy_Tree
(Expression
(Parent
(Comp
))), Expressions
(Agg
));
1290 Next_Component
(Comp
);
1293 Analyze_And_Resolve
(Agg
, T
);
1295 end Build_Equivalent_Record_Aggregate
;
1297 -------------------------------
1298 -- Build_Initialization_Call --
1299 -------------------------------
1301 -- References to a discriminant inside the record type declaration can
1302 -- appear either in the subtype_indication to constrain a record or an
1303 -- array, or as part of a larger expression given for the initial value
1304 -- of a component. In both of these cases N appears in the record
1305 -- initialization procedure and needs to be replaced by the formal
1306 -- parameter of the initialization procedure which corresponds to that
1309 -- In the example below, references to discriminants D1 and D2 in proc_1
1310 -- are replaced by references to formals with the same name
1313 -- A similar replacement is done for calls to any record initialization
1314 -- procedure for any components that are themselves of a record type.
1316 -- type R (D1, D2 : Integer) is record
1317 -- X : Integer := F * D1;
1318 -- Y : Integer := F * D2;
1321 -- procedure proc_1 (Out_2 : out R; D1 : Integer; D2 : Integer) is
1325 -- Out_2.X := F * D1;
1326 -- Out_2.Y := F * D2;
1329 function Build_Initialization_Call
1333 In_Init_Proc
: Boolean := False;
1334 Enclos_Type
: Entity_Id
:= Empty
;
1335 Discr_Map
: Elist_Id
:= New_Elmt_List
;
1336 With_Default_Init
: Boolean := False) return List_Id
1338 First_Arg
: Node_Id
;
1344 Proc
: constant Entity_Id
:= Base_Init_Proc
(Typ
);
1345 Init_Type
: constant Entity_Id
:= Etype
(First_Formal
(Proc
));
1346 Full_Init_Type
: constant Entity_Id
:= Underlying_Type
(Init_Type
);
1347 Res
: constant List_Id
:= New_List
;
1348 Full_Type
: Entity_Id
:= Typ
;
1349 Controller_Typ
: Entity_Id
;
1352 -- Nothing to do if the Init_Proc is null, unless Initialize_Scalars
1353 -- is active (in which case we make the call anyway, since in the
1354 -- actual compiled client it may be non null).
1355 -- Also nothing to do for value types.
1357 if (Is_Null_Init_Proc
(Proc
) and then not Init_Or_Norm_Scalars
)
1358 or else Is_Value_Type
(Typ
)
1359 or else Is_Value_Type
(Component_Type
(Typ
))
1364 -- Go to full view if private type. In the case of successive
1365 -- private derivations, this can require more than one step.
1367 while Is_Private_Type
(Full_Type
)
1368 and then Present
(Full_View
(Full_Type
))
1370 Full_Type
:= Full_View
(Full_Type
);
1373 -- If Typ is derived, the procedure is the initialization procedure for
1374 -- the root type. Wrap the argument in an conversion to make it type
1375 -- honest. Actually it isn't quite type honest, because there can be
1376 -- conflicts of views in the private type case. That is why we set
1377 -- Conversion_OK in the conversion node.
1379 if (Is_Record_Type
(Typ
)
1380 or else Is_Array_Type
(Typ
)
1381 or else Is_Private_Type
(Typ
))
1382 and then Init_Type
/= Base_Type
(Typ
)
1384 First_Arg
:= OK_Convert_To
(Etype
(Init_Type
), Id_Ref
);
1385 Set_Etype
(First_Arg
, Init_Type
);
1388 First_Arg
:= Id_Ref
;
1391 Args
:= New_List
(Convert_Concurrent
(First_Arg
, Typ
));
1393 -- In the tasks case, add _Master as the value of the _Master parameter
1394 -- and _Chain as the value of the _Chain parameter. At the outer level,
1395 -- these will be variables holding the corresponding values obtained
1396 -- from GNARL. At inner levels, they will be the parameters passed down
1397 -- through the outer routines.
1399 if Has_Task
(Full_Type
) then
1400 if Restriction_Active
(No_Task_Hierarchy
) then
1402 -- See comments in System.Tasking.Initialization.Init_RTS
1403 -- for the value 3 (should be rtsfindable constant ???)
1405 Append_To
(Args
, Make_Integer_Literal
(Loc
, 3));
1408 Append_To
(Args
, Make_Identifier
(Loc
, Name_uMaster
));
1411 Append_To
(Args
, Make_Identifier
(Loc
, Name_uChain
));
1413 -- Ada 2005 (AI-287): In case of default initialized components
1414 -- with tasks, we generate a null string actual parameter.
1415 -- This is just a workaround that must be improved later???
1417 if With_Default_Init
then
1419 Make_String_Literal
(Loc
,
1424 Build_Task_Image_Decls
(Loc
, Id_Ref
, Enclos_Type
, In_Init_Proc
);
1425 Decl
:= Last
(Decls
);
1428 New_Occurrence_Of
(Defining_Identifier
(Decl
), Loc
));
1429 Append_List
(Decls
, Res
);
1437 -- Add discriminant values if discriminants are present
1439 if Has_Discriminants
(Full_Init_Type
) then
1440 Discr
:= First_Discriminant
(Full_Init_Type
);
1442 while Present
(Discr
) loop
1444 -- If this is a discriminated concurrent type, the init_proc
1445 -- for the corresponding record is being called. Use that type
1446 -- directly to find the discriminant value, to handle properly
1447 -- intervening renamed discriminants.
1450 T
: Entity_Id
:= Full_Type
;
1453 if Is_Protected_Type
(T
) then
1454 T
:= Corresponding_Record_Type
(T
);
1456 elsif Is_Private_Type
(T
)
1457 and then Present
(Underlying_Full_View
(T
))
1458 and then Is_Protected_Type
(Underlying_Full_View
(T
))
1460 T
:= Corresponding_Record_Type
(Underlying_Full_View
(T
));
1464 Get_Discriminant_Value
(
1467 Discriminant_Constraint
(Full_Type
));
1470 if In_Init_Proc
then
1472 -- Replace any possible references to the discriminant in the
1473 -- call to the record initialization procedure with references
1474 -- to the appropriate formal parameter.
1476 if Nkind
(Arg
) = N_Identifier
1477 and then Ekind
(Entity
(Arg
)) = E_Discriminant
1479 Arg
:= New_Reference_To
(Discriminal
(Entity
(Arg
)), Loc
);
1481 -- Case of access discriminants. We replace the reference
1482 -- to the type by a reference to the actual object
1484 elsif Nkind
(Arg
) = N_Attribute_Reference
1485 and then Is_Access_Type
(Etype
(Arg
))
1486 and then Is_Entity_Name
(Prefix
(Arg
))
1487 and then Is_Type
(Entity
(Prefix
(Arg
)))
1490 Make_Attribute_Reference
(Loc
,
1491 Prefix
=> New_Copy
(Prefix
(Id_Ref
)),
1492 Attribute_Name
=> Name_Unrestricted_Access
);
1494 -- Otherwise make a copy of the default expression. Note that
1495 -- we use the current Sloc for this, because we do not want the
1496 -- call to appear to be at the declaration point. Within the
1497 -- expression, replace discriminants with their discriminals.
1501 New_Copy_Tree
(Arg
, Map
=> Discr_Map
, New_Sloc
=> Loc
);
1505 if Is_Constrained
(Full_Type
) then
1506 Arg
:= Duplicate_Subexpr_No_Checks
(Arg
);
1508 -- The constraints come from the discriminant default exps,
1509 -- they must be reevaluated, so we use New_Copy_Tree but we
1510 -- ensure the proper Sloc (for any embedded calls).
1512 Arg
:= New_Copy_Tree
(Arg
, New_Sloc
=> Loc
);
1516 -- Ada 2005 (AI-287) In case of default initialized components,
1517 -- we need to generate the corresponding selected component node
1518 -- to access the discriminant value. In other cases this is not
1519 -- required because we are inside the init proc and we use the
1520 -- corresponding formal.
1522 if With_Default_Init
1523 and then Nkind
(Id_Ref
) = N_Selected_Component
1524 and then Nkind
(Arg
) = N_Identifier
1527 Make_Selected_Component
(Loc
,
1528 Prefix
=> New_Copy_Tree
(Prefix
(Id_Ref
)),
1529 Selector_Name
=> Arg
));
1531 Append_To
(Args
, Arg
);
1534 Next_Discriminant
(Discr
);
1538 -- If this is a call to initialize the parent component of a derived
1539 -- tagged type, indicate that the tag should not be set in the parent.
1541 if Is_Tagged_Type
(Full_Init_Type
)
1542 and then not Is_CPP_Class
(Full_Init_Type
)
1543 and then Nkind
(Id_Ref
) = N_Selected_Component
1544 and then Chars
(Selector_Name
(Id_Ref
)) = Name_uParent
1546 Append_To
(Args
, New_Occurrence_Of
(Standard_False
, Loc
));
1550 Make_Procedure_Call_Statement
(Loc
,
1551 Name
=> New_Occurrence_Of
(Proc
, Loc
),
1552 Parameter_Associations
=> Args
));
1554 if Controlled_Type
(Typ
)
1555 and then Nkind
(Id_Ref
) = N_Selected_Component
1557 if Chars
(Selector_Name
(Id_Ref
)) /= Name_uParent
then
1558 Append_List_To
(Res
,
1560 Ref
=> New_Copy_Tree
(First_Arg
),
1563 Find_Final_List
(Typ
, New_Copy_Tree
(First_Arg
)),
1564 With_Attach
=> Make_Integer_Literal
(Loc
, 1)));
1566 -- If the enclosing type is an extension with new controlled
1567 -- components, it has his own record controller. If the parent
1568 -- also had a record controller, attach it to the new one.
1570 -- Build_Init_Statements relies on the fact that in this specific
1571 -- case the last statement of the result is the attach call to
1572 -- the controller. If this is changed, it must be synchronized.
1574 elsif Present
(Enclos_Type
)
1575 and then Has_New_Controlled_Component
(Enclos_Type
)
1576 and then Has_Controlled_Component
(Typ
)
1578 if Is_Inherently_Limited_Type
(Typ
) then
1579 Controller_Typ
:= RTE
(RE_Limited_Record_Controller
);
1581 Controller_Typ
:= RTE
(RE_Record_Controller
);
1584 Append_List_To
(Res
,
1587 Make_Selected_Component
(Loc
,
1588 Prefix
=> New_Copy_Tree
(First_Arg
),
1589 Selector_Name
=> Make_Identifier
(Loc
, Name_uController
)),
1590 Typ
=> Controller_Typ
,
1591 Flist_Ref
=> Find_Final_List
(Typ
, New_Copy_Tree
(First_Arg
)),
1592 With_Attach
=> Make_Integer_Literal
(Loc
, 1)));
1599 when RE_Not_Available
=>
1601 end Build_Initialization_Call
;
1603 ---------------------------
1604 -- Build_Master_Renaming --
1605 ---------------------------
1607 function Build_Master_Renaming
1609 T
: Entity_Id
) return Entity_Id
1611 Loc
: constant Source_Ptr
:= Sloc
(N
);
1616 -- Nothing to do if there is no task hierarchy
1618 if Restriction_Active
(No_Task_Hierarchy
) then
1623 Make_Defining_Identifier
(Loc
,
1624 New_External_Name
(Chars
(T
), 'M'));
1627 Make_Object_Renaming_Declaration
(Loc
,
1628 Defining_Identifier
=> M_Id
,
1629 Subtype_Mark
=> New_Reference_To
(RTE
(RE_Master_Id
), Loc
),
1630 Name
=> Make_Identifier
(Loc
, Name_uMaster
));
1631 Insert_Before
(N
, Decl
);
1636 when RE_Not_Available
=>
1638 end Build_Master_Renaming
;
1640 ---------------------------
1641 -- Build_Master_Renaming --
1642 ---------------------------
1644 procedure Build_Master_Renaming
(N
: Node_Id
; T
: Entity_Id
) is
1648 -- Nothing to do if there is no task hierarchy
1650 if Restriction_Active
(No_Task_Hierarchy
) then
1654 M_Id
:= Build_Master_Renaming
(N
, T
);
1655 Set_Master_Id
(T
, M_Id
);
1658 when RE_Not_Available
=>
1660 end Build_Master_Renaming
;
1662 ----------------------------
1663 -- Build_Record_Init_Proc --
1664 ----------------------------
1666 procedure Build_Record_Init_Proc
(N
: Node_Id
; Pe
: Entity_Id
) is
1667 Loc
: Source_Ptr
:= Sloc
(N
);
1668 Discr_Map
: constant Elist_Id
:= New_Elmt_List
;
1669 Proc_Id
: Entity_Id
;
1670 Rec_Type
: Entity_Id
;
1671 Set_Tag
: Entity_Id
:= Empty
;
1673 function Build_Assignment
(Id
: Entity_Id
; N
: Node_Id
) return List_Id
;
1674 -- Build a assignment statement node which assigns to record component
1675 -- its default expression if defined. The assignment left hand side is
1676 -- marked Assignment_OK so that initialization of limited private
1677 -- records works correctly, Return also the adjustment call for
1678 -- controlled objects
1680 procedure Build_Discriminant_Assignments
(Statement_List
: List_Id
);
1681 -- If the record has discriminants, adds assignment statements to
1682 -- statement list to initialize the discriminant values from the
1683 -- arguments of the initialization procedure.
1685 function Build_Init_Statements
(Comp_List
: Node_Id
) return List_Id
;
1686 -- Build a list representing a sequence of statements which initialize
1687 -- components of the given component list. This may involve building
1688 -- case statements for the variant parts.
1690 function Build_Init_Call_Thru
(Parameters
: List_Id
) return List_Id
;
1691 -- Given a non-tagged type-derivation that declares discriminants,
1694 -- type R (R1, R2 : Integer) is record ... end record;
1696 -- type D (D1 : Integer) is new R (1, D1);
1698 -- we make the _init_proc of D be
1700 -- procedure _init_proc(X : D; D1 : Integer) is
1702 -- _init_proc( R(X), 1, D1);
1705 -- This function builds the call statement in this _init_proc.
1707 procedure Build_Init_Procedure
;
1708 -- Build the tree corresponding to the procedure specification and body
1709 -- of the initialization procedure (by calling all the preceding
1710 -- auxiliary routines), and install it as the _init TSS.
1712 procedure Build_Offset_To_Top_Functions
;
1713 -- Ada 2005 (AI-251): Build the tree corresponding to the procedure spec
1714 -- and body of the Offset_To_Top function that is generated when the
1715 -- parent of a type with discriminants has secondary dispatch tables.
1717 procedure Build_Record_Checks
(S
: Node_Id
; Check_List
: List_Id
);
1718 -- Add range checks to components of discriminated records. S is a
1719 -- subtype indication of a record component. Check_List is a list
1720 -- to which the check actions are appended.
1722 function Component_Needs_Simple_Initialization
1723 (T
: Entity_Id
) return Boolean;
1724 -- Determines if a component needs simple initialization, given its type
1725 -- T. This is the same as Needs_Simple_Initialization except for the
1726 -- following difference: the types Tag and Interface_Tag, that are
1727 -- access types which would normally require simple initialization to
1728 -- null, do not require initialization as components, since they are
1729 -- explicitly initialized by other means.
1731 procedure Constrain_Array
1733 Check_List
: List_Id
);
1734 -- Called from Build_Record_Checks.
1735 -- Apply a list of index constraints to an unconstrained array type.
1736 -- The first parameter is the entity for the resulting subtype.
1737 -- Check_List is a list to which the check actions are appended.
1739 procedure Constrain_Index
1742 Check_List
: List_Id
);
1743 -- Process an index constraint in a constrained array declaration.
1744 -- The constraint can be a subtype name, or a range with or without
1745 -- an explicit subtype mark. The index is the corresponding index of the
1746 -- unconstrained array. S is the range expression. Check_List is a list
1747 -- to which the check actions are appended (called from
1748 -- Build_Record_Checks).
1750 function Parent_Subtype_Renaming_Discrims
return Boolean;
1751 -- Returns True for base types N that rename discriminants, else False
1753 function Requires_Init_Proc
(Rec_Id
: Entity_Id
) return Boolean;
1754 -- Determines whether a record initialization procedure needs to be
1755 -- generated for the given record type.
1757 ----------------------
1758 -- Build_Assignment --
1759 ----------------------
1761 function Build_Assignment
(Id
: Entity_Id
; N
: Node_Id
) return List_Id
is
1764 Typ
: constant Entity_Id
:= Underlying_Type
(Etype
(Id
));
1765 Kind
: Node_Kind
:= Nkind
(N
);
1771 Make_Selected_Component
(Loc
,
1772 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
1773 Selector_Name
=> New_Occurrence_Of
(Id
, Loc
));
1774 Set_Assignment_OK
(Lhs
);
1776 -- Case of an access attribute applied to the current instance.
1777 -- Replace the reference to the type by a reference to the actual
1778 -- object. (Note that this handles the case of the top level of
1779 -- the expression being given by such an attribute, but does not
1780 -- cover uses nested within an initial value expression. Nested
1781 -- uses are unlikely to occur in practice, but are theoretically
1782 -- possible. It is not clear how to handle them without fully
1783 -- traversing the expression. ???
1785 if Kind
= N_Attribute_Reference
1786 and then (Attribute_Name
(N
) = Name_Unchecked_Access
1788 Attribute_Name
(N
) = Name_Unrestricted_Access
)
1789 and then Is_Entity_Name
(Prefix
(N
))
1790 and then Is_Type
(Entity
(Prefix
(N
)))
1791 and then Entity
(Prefix
(N
)) = Rec_Type
1794 Make_Attribute_Reference
(Loc
,
1795 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
1796 Attribute_Name
=> Name_Unrestricted_Access
);
1799 -- Ada 2005 (AI-231): Add the run-time check if required
1801 if Ada_Version
>= Ada_05
1802 and then Can_Never_Be_Null
(Etype
(Id
)) -- Lhs
1804 if Known_Null
(Exp
) then
1806 Make_Raise_Constraint_Error
(Sloc
(Exp
),
1807 Reason
=> CE_Null_Not_Allowed
));
1809 elsif Present
(Etype
(Exp
))
1810 and then not Can_Never_Be_Null
(Etype
(Exp
))
1812 Install_Null_Excluding_Check
(Exp
);
1816 -- Take a copy of Exp to ensure that later copies of this component
1817 -- declaration in derived types see the original tree, not a node
1818 -- rewritten during expansion of the init_proc.
1820 Exp
:= New_Copy_Tree
(Exp
);
1823 Make_Assignment_Statement
(Loc
,
1825 Expression
=> Exp
));
1827 Set_No_Ctrl_Actions
(First
(Res
));
1829 -- Adjust the tag if tagged (because of possible view conversions).
1830 -- Suppress the tag adjustment when VM_Target because VM tags are
1831 -- represented implicitly in objects.
1833 if Is_Tagged_Type
(Typ
) and then VM_Target
= No_VM
then
1835 Make_Assignment_Statement
(Loc
,
1837 Make_Selected_Component
(Loc
,
1838 Prefix
=> New_Copy_Tree
(Lhs
),
1840 New_Reference_To
(First_Tag_Component
(Typ
), Loc
)),
1843 Unchecked_Convert_To
(RTE
(RE_Tag
),
1845 (Node
(First_Elmt
(Access_Disp_Table
(Typ
))), Loc
))));
1848 -- Adjust the component if controlled except if it is an aggregate
1849 -- that will be expanded inline
1851 if Kind
= N_Qualified_Expression
then
1852 Kind
:= Nkind
(Expression
(N
));
1855 if Controlled_Type
(Typ
)
1856 and then not (Kind
= N_Aggregate
or else Kind
= N_Extension_Aggregate
)
1857 and then not Is_Inherently_Limited_Type
(Typ
)
1859 Append_List_To
(Res
,
1861 Ref
=> New_Copy_Tree
(Lhs
),
1864 Find_Final_List
(Etype
(Id
), New_Copy_Tree
(Lhs
)),
1865 With_Attach
=> Make_Integer_Literal
(Loc
, 1)));
1871 when RE_Not_Available
=>
1873 end Build_Assignment
;
1875 ------------------------------------
1876 -- Build_Discriminant_Assignments --
1877 ------------------------------------
1879 procedure Build_Discriminant_Assignments
(Statement_List
: List_Id
) is
1881 Is_Tagged
: constant Boolean := Is_Tagged_Type
(Rec_Type
);
1884 if Has_Discriminants
(Rec_Type
)
1885 and then not Is_Unchecked_Union
(Rec_Type
)
1887 D
:= First_Discriminant
(Rec_Type
);
1889 while Present
(D
) loop
1890 -- Don't generate the assignment for discriminants in derived
1891 -- tagged types if the discriminant is a renaming of some
1892 -- ancestor discriminant. This initialization will be done
1893 -- when initializing the _parent field of the derived record.
1895 if Is_Tagged
and then
1896 Present
(Corresponding_Discriminant
(D
))
1902 Append_List_To
(Statement_List
,
1903 Build_Assignment
(D
,
1904 New_Reference_To
(Discriminal
(D
), Loc
)));
1907 Next_Discriminant
(D
);
1910 end Build_Discriminant_Assignments
;
1912 --------------------------
1913 -- Build_Init_Call_Thru --
1914 --------------------------
1916 function Build_Init_Call_Thru
(Parameters
: List_Id
) return List_Id
is
1917 Parent_Proc
: constant Entity_Id
:=
1918 Base_Init_Proc
(Etype
(Rec_Type
));
1920 Parent_Type
: constant Entity_Id
:=
1921 Etype
(First_Formal
(Parent_Proc
));
1923 Uparent_Type
: constant Entity_Id
:=
1924 Underlying_Type
(Parent_Type
);
1926 First_Discr_Param
: Node_Id
;
1928 Parent_Discr
: Entity_Id
;
1929 First_Arg
: Node_Id
;
1935 -- First argument (_Init) is the object to be initialized.
1936 -- ??? not sure where to get a reasonable Loc for First_Arg
1939 OK_Convert_To
(Parent_Type
,
1940 New_Reference_To
(Defining_Identifier
(First
(Parameters
)), Loc
));
1942 Set_Etype
(First_Arg
, Parent_Type
);
1944 Args
:= New_List
(Convert_Concurrent
(First_Arg
, Rec_Type
));
1946 -- In the tasks case,
1947 -- add _Master as the value of the _Master parameter
1948 -- add _Chain as the value of the _Chain parameter.
1949 -- add _Task_Name as the value of the _Task_Name parameter.
1950 -- At the outer level, these will be variables holding the
1951 -- corresponding values obtained from GNARL or the expander.
1953 -- At inner levels, they will be the parameters passed down through
1954 -- the outer routines.
1956 First_Discr_Param
:= Next
(First
(Parameters
));
1958 if Has_Task
(Rec_Type
) then
1959 if Restriction_Active
(No_Task_Hierarchy
) then
1961 -- See comments in System.Tasking.Initialization.Init_RTS
1964 Append_To
(Args
, Make_Integer_Literal
(Loc
, 3));
1966 Append_To
(Args
, Make_Identifier
(Loc
, Name_uMaster
));
1969 Append_To
(Args
, Make_Identifier
(Loc
, Name_uChain
));
1970 Append_To
(Args
, Make_Identifier
(Loc
, Name_uTask_Name
));
1971 First_Discr_Param
:= Next
(Next
(Next
(First_Discr_Param
)));
1974 -- Append discriminant values
1976 if Has_Discriminants
(Uparent_Type
) then
1977 pragma Assert
(not Is_Tagged_Type
(Uparent_Type
));
1979 Parent_Discr
:= First_Discriminant
(Uparent_Type
);
1980 while Present
(Parent_Discr
) loop
1982 -- Get the initial value for this discriminant
1983 -- ??? needs to be cleaned up to use parent_Discr_Constr
1987 Discr_Value
: Elmt_Id
:=
1989 (Stored_Constraint
(Rec_Type
));
1991 Discr
: Entity_Id
:=
1992 First_Stored_Discriminant
(Uparent_Type
);
1994 while Original_Record_Component
(Parent_Discr
) /= Discr
loop
1995 Next_Stored_Discriminant
(Discr
);
1996 Next_Elmt
(Discr_Value
);
1999 Arg
:= Node
(Discr_Value
);
2002 -- Append it to the list
2004 if Nkind
(Arg
) = N_Identifier
2005 and then Ekind
(Entity
(Arg
)) = E_Discriminant
2008 New_Reference_To
(Discriminal
(Entity
(Arg
)), Loc
));
2010 -- Case of access discriminants. We replace the reference
2011 -- to the type by a reference to the actual object.
2013 -- Is above comment right??? Use of New_Copy below seems mighty
2017 Append_To
(Args
, New_Copy
(Arg
));
2020 Next_Discriminant
(Parent_Discr
);
2026 Make_Procedure_Call_Statement
(Loc
,
2027 Name
=> New_Occurrence_Of
(Parent_Proc
, Loc
),
2028 Parameter_Associations
=> Args
));
2031 end Build_Init_Call_Thru
;
2033 -----------------------------------
2034 -- Build_Offset_To_Top_Functions --
2035 -----------------------------------
2037 procedure Build_Offset_To_Top_Functions
is
2039 procedure Build_Offset_To_Top_Function
(Iface_Comp
: Entity_Id
);
2041 -- function Fxx (O : in Rec_Typ) return Storage_Offset is
2043 -- return O.Iface_Comp'Position;
2046 ------------------------------
2047 -- Build_Offset_To_Top_Body --
2048 ------------------------------
2050 procedure Build_Offset_To_Top_Function
(Iface_Comp
: Entity_Id
) is
2051 Body_Node
: Node_Id
;
2052 Func_Id
: Entity_Id
;
2053 Spec_Node
: Node_Id
;
2057 Make_Defining_Identifier
(Loc
,
2058 Chars
=> New_Internal_Name
('F'));
2060 Set_DT_Offset_To_Top_Func
(Iface_Comp
, Func_Id
);
2063 -- function Fxx (O : in Rec_Typ) return Storage_Offset;
2065 Spec_Node
:= New_Node
(N_Function_Specification
, Loc
);
2066 Set_Defining_Unit_Name
(Spec_Node
, Func_Id
);
2067 Set_Parameter_Specifications
(Spec_Node
, New_List
(
2068 Make_Parameter_Specification
(Loc
,
2069 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_uO
),
2071 Parameter_Type
=> New_Reference_To
(Rec_Type
, Loc
))));
2072 Set_Result_Definition
(Spec_Node
,
2073 New_Reference_To
(RTE
(RE_Storage_Offset
), Loc
));
2076 -- function Fxx (O : in Rec_Typ) return Storage_Offset is
2078 -- return O.Iface_Comp'Position;
2081 Body_Node
:= New_Node
(N_Subprogram_Body
, Loc
);
2082 Set_Specification
(Body_Node
, Spec_Node
);
2083 Set_Declarations
(Body_Node
, New_List
);
2084 Set_Handled_Statement_Sequence
(Body_Node
,
2085 Make_Handled_Sequence_Of_Statements
(Loc
,
2086 Statements
=> New_List
(
2087 Make_Simple_Return_Statement
(Loc
,
2089 Make_Attribute_Reference
(Loc
,
2091 Make_Selected_Component
(Loc
,
2092 Prefix
=> Make_Identifier
(Loc
, Name_uO
),
2093 Selector_Name
=> New_Reference_To
2095 Attribute_Name
=> Name_Position
)))));
2097 Set_Ekind
(Func_Id
, E_Function
);
2098 Set_Mechanism
(Func_Id
, Default_Mechanism
);
2099 Set_Is_Internal
(Func_Id
, True);
2101 if not Debug_Generated_Code
then
2102 Set_Debug_Info_Off
(Func_Id
);
2105 Analyze
(Body_Node
);
2107 Append_Freeze_Action
(Rec_Type
, Body_Node
);
2108 end Build_Offset_To_Top_Function
;
2112 Ifaces_List
: Elist_Id
;
2113 Ifaces_Comp_List
: Elist_Id
;
2114 Ifaces_Tag_List
: Elist_Id
;
2115 Iface_Elmt
: Elmt_Id
;
2116 Comp_Elmt
: Elmt_Id
;
2118 pragma Warnings
(Off
, Ifaces_Tag_List
);
2120 -- Start of processing for Build_Offset_To_Top_Functions
2123 -- Offset_To_Top_Functions are built only for derivations of types
2124 -- with discriminants that cover interface types.
2125 -- Nothing is needed either in case of virtual machines, since
2126 -- interfaces are handled directly by the VM.
2128 if not Is_Tagged_Type
(Rec_Type
)
2129 or else Etype
(Rec_Type
) = Rec_Type
2130 or else not Has_Discriminants
(Etype
(Rec_Type
))
2131 or else VM_Target
/= No_VM
2136 Collect_Interfaces_Info
2137 (Rec_Type
, Ifaces_List
, Ifaces_Comp_List
, Ifaces_Tag_List
);
2139 -- For each interface type with secondary dispatch table we generate
2140 -- the Offset_To_Top_Functions (required to displace the pointer in
2141 -- interface conversions)
2143 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
2144 Comp_Elmt
:= First_Elmt
(Ifaces_Comp_List
);
2145 while Present
(Iface_Elmt
) loop
2147 -- If the interface is a parent of Rec_Type it shares the primary
2148 -- dispatch table and hence there is no need to build the function
2150 if not Is_Parent
(Node
(Iface_Elmt
), Rec_Type
) then
2151 Build_Offset_To_Top_Function
(Iface_Comp
=> Node
(Comp_Elmt
));
2154 Next_Elmt
(Iface_Elmt
);
2155 Next_Elmt
(Comp_Elmt
);
2157 end Build_Offset_To_Top_Functions
;
2159 --------------------------
2160 -- Build_Init_Procedure --
2161 --------------------------
2163 procedure Build_Init_Procedure
is
2164 Body_Node
: Node_Id
;
2165 Handled_Stmt_Node
: Node_Id
;
2166 Parameters
: List_Id
;
2167 Proc_Spec_Node
: Node_Id
;
2168 Body_Stmts
: List_Id
;
2169 Record_Extension_Node
: Node_Id
;
2170 Init_Tags_List
: List_Id
;
2173 Body_Stmts
:= New_List
;
2174 Body_Node
:= New_Node
(N_Subprogram_Body
, Loc
);
2177 Make_Defining_Identifier
(Loc
,
2178 Chars
=> Make_Init_Proc_Name
(Rec_Type
));
2179 Set_Ekind
(Proc_Id
, E_Procedure
);
2181 Proc_Spec_Node
:= New_Node
(N_Procedure_Specification
, Loc
);
2182 Set_Defining_Unit_Name
(Proc_Spec_Node
, Proc_Id
);
2184 Parameters
:= Init_Formals
(Rec_Type
);
2185 Append_List_To
(Parameters
,
2186 Build_Discriminant_Formals
(Rec_Type
, True));
2188 -- For tagged types, we add a flag to indicate whether the routine
2189 -- is called to initialize a parent component in the init_proc of
2190 -- a type extension. If the flag is false, we do not set the tag
2191 -- because it has been set already in the extension.
2193 if Is_Tagged_Type
(Rec_Type
)
2194 and then not Is_CPP_Class
(Rec_Type
)
2197 Make_Defining_Identifier
(Loc
,
2198 Chars
=> New_Internal_Name
('P'));
2200 Append_To
(Parameters
,
2201 Make_Parameter_Specification
(Loc
,
2202 Defining_Identifier
=> Set_Tag
,
2203 Parameter_Type
=> New_Occurrence_Of
(Standard_Boolean
, Loc
),
2204 Expression
=> New_Occurrence_Of
(Standard_True
, Loc
)));
2207 Set_Parameter_Specifications
(Proc_Spec_Node
, Parameters
);
2208 Set_Specification
(Body_Node
, Proc_Spec_Node
);
2209 Set_Declarations
(Body_Node
, New_List
);
2211 if Parent_Subtype_Renaming_Discrims
then
2213 -- N is a Derived_Type_Definition that renames the parameters
2214 -- of the ancestor type. We initialize it by expanding our
2215 -- discriminants and call the ancestor _init_proc with a
2216 -- type-converted object
2218 Append_List_To
(Body_Stmts
,
2219 Build_Init_Call_Thru
(Parameters
));
2221 elsif Nkind
(Type_Definition
(N
)) = N_Record_Definition
then
2222 Build_Discriminant_Assignments
(Body_Stmts
);
2224 if not Null_Present
(Type_Definition
(N
)) then
2225 Append_List_To
(Body_Stmts
,
2226 Build_Init_Statements
(
2227 Component_List
(Type_Definition
(N
))));
2231 -- N is a Derived_Type_Definition with a possible non-empty
2232 -- extension. The initialization of a type extension consists
2233 -- in the initialization of the components in the extension.
2235 Build_Discriminant_Assignments
(Body_Stmts
);
2237 Record_Extension_Node
:=
2238 Record_Extension_Part
(Type_Definition
(N
));
2240 if not Null_Present
(Record_Extension_Node
) then
2242 Stmts
: constant List_Id
:=
2243 Build_Init_Statements
(
2244 Component_List
(Record_Extension_Node
));
2247 -- The parent field must be initialized first because
2248 -- the offset of the new discriminants may depend on it
2250 Prepend_To
(Body_Stmts
, Remove_Head
(Stmts
));
2251 Append_List_To
(Body_Stmts
, Stmts
);
2256 -- Add here the assignment to instantiate the Tag
2258 -- The assignment corresponds to the code:
2260 -- _Init._Tag := Typ'Tag;
2262 -- Suppress the tag assignment when VM_Target because VM tags are
2263 -- represented implicitly in objects. It is also suppressed in case
2264 -- of CPP_Class types because in this case the tag is initialized in
2267 if Is_Tagged_Type
(Rec_Type
)
2268 and then not Is_CPP_Class
(Rec_Type
)
2269 and then VM_Target
= No_VM
2270 and then not No_Run_Time_Mode
2272 -- Initialize the primary tag
2274 Init_Tags_List
:= New_List
(
2275 Make_Assignment_Statement
(Loc
,
2277 Make_Selected_Component
(Loc
,
2278 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
2280 New_Reference_To
(First_Tag_Component
(Rec_Type
), Loc
)),
2284 (Node
(First_Elmt
(Access_Disp_Table
(Rec_Type
))), Loc
)));
2286 -- Ada 2005 (AI-251): Initialize the secondary tags components
2287 -- located at fixed positions (tags whose position depends on
2288 -- variable size components are initialized later ---see below).
2290 if Ada_Version
>= Ada_05
2291 and then not Is_Interface
(Rec_Type
)
2292 and then Has_Abstract_Interfaces
(Rec_Type
)
2296 Target
=> Make_Identifier
(Loc
, Name_uInit
),
2297 Stmts_List
=> Init_Tags_List
,
2298 Fixed_Comps
=> True,
2299 Variable_Comps
=> False);
2302 -- The tag must be inserted before the assignments to other
2303 -- components, because the initial value of the component may
2304 -- depend on the tag (eg. through a dispatching operation on
2305 -- an access to the current type). The tag assignment is not done
2306 -- when initializing the parent component of a type extension,
2307 -- because in that case the tag is set in the extension.
2309 -- Extensions of imported C++ classes add a final complication,
2310 -- because we cannot inhibit tag setting in the constructor for
2311 -- the parent. In that case we insert the tag initialization
2312 -- after the calls to initialize the parent.
2314 if not Is_CPP_Class
(Root_Type
(Rec_Type
)) then
2315 Prepend_To
(Body_Stmts
,
2316 Make_If_Statement
(Loc
,
2317 Condition
=> New_Occurrence_Of
(Set_Tag
, Loc
),
2318 Then_Statements
=> Init_Tags_List
));
2320 -- CPP_Class derivation: In this case the dispatch table of the
2321 -- parent was built in the C++ side and we copy the table of the
2322 -- parent to initialize the new dispatch table.
2329 -- We assume the first init_proc call is for the parent
2331 Nod
:= First
(Body_Stmts
);
2332 while Present
(Next
(Nod
))
2333 and then (Nkind
(Nod
) /= N_Procedure_Call_Statement
2334 or else not Is_Init_Proc
(Name
(Nod
)))
2340 -- ancestor_constructor (_init.parent);
2342 -- inherit_prim_ops (_init._tag, new_dt, num_prims);
2343 -- _init._tag := new_dt;
2346 Prepend_To
(Init_Tags_List
,
2347 Build_Inherit_Prims
(Loc
,
2350 Make_Selected_Component
(Loc
,
2352 Make_Identifier
(Loc
,
2353 Chars
=> Name_uInit
),
2356 (First_Tag_Component
(Rec_Type
), Loc
)),
2359 (Node
(First_Elmt
(Access_Disp_Table
(Rec_Type
))),
2363 (DT_Entry_Count
(First_Tag_Component
(Rec_Type
)))));
2366 Make_If_Statement
(Loc
,
2367 Condition
=> New_Occurrence_Of
(Set_Tag
, Loc
),
2368 Then_Statements
=> Init_Tags_List
));
2370 -- We have inherited table of the parent from the CPP side.
2371 -- Now we fill the slots associated with Ada primitives.
2372 -- This needs more work to avoid its execution each time
2373 -- an object is initialized???
2380 E
:= First_Elmt
(Primitive_Operations
(Rec_Type
));
2381 while Present
(E
) loop
2384 if not Is_Imported
(Prim
)
2385 and then Convention
(Prim
) = Convention_CPP
2386 and then not Present
(Abstract_Interface_Alias
2389 Register_Primitive
(Loc
,
2391 Ins_Nod
=> Last
(Init_Tags_List
));
2400 -- Ada 2005 (AI-251): Initialize the secondary tag components
2401 -- located at variable positions. We delay the generation of this
2402 -- code until here because the value of the attribute 'Position
2403 -- applied to variable size components of the parent type that
2404 -- depend on discriminants is only safely read at runtime after
2405 -- the parent components have been initialized.
2407 if Ada_Version
>= Ada_05
2408 and then not Is_Interface
(Rec_Type
)
2409 and then Has_Abstract_Interfaces
(Rec_Type
)
2410 and then Has_Discriminants
(Etype
(Rec_Type
))
2411 and then Is_Variable_Size_Record
(Etype
(Rec_Type
))
2413 Init_Tags_List
:= New_List
;
2417 Target
=> Make_Identifier
(Loc
, Name_uInit
),
2418 Stmts_List
=> Init_Tags_List
,
2419 Fixed_Comps
=> False,
2420 Variable_Comps
=> True);
2422 if Is_Non_Empty_List
(Init_Tags_List
) then
2423 Append_List_To
(Body_Stmts
, Init_Tags_List
);
2428 Handled_Stmt_Node
:= New_Node
(N_Handled_Sequence_Of_Statements
, Loc
);
2429 Set_Statements
(Handled_Stmt_Node
, Body_Stmts
);
2430 Set_Exception_Handlers
(Handled_Stmt_Node
, No_List
);
2431 Set_Handled_Statement_Sequence
(Body_Node
, Handled_Stmt_Node
);
2433 if not Debug_Generated_Code
then
2434 Set_Debug_Info_Off
(Proc_Id
);
2437 -- Associate Init_Proc with type, and determine if the procedure
2438 -- is null (happens because of the Initialize_Scalars pragma case,
2439 -- where we have to generate a null procedure in case it is called
2440 -- by a client with Initialize_Scalars set). Such procedures have
2441 -- to be generated, but do not have to be called, so we mark them
2442 -- as null to suppress the call.
2444 Set_Init_Proc
(Rec_Type
, Proc_Id
);
2446 if List_Length
(Body_Stmts
) = 1
2447 and then Nkind
(First
(Body_Stmts
)) = N_Null_Statement
2448 and then VM_Target
/= CLI_Target
2450 -- Even though the init proc may be null at this time it might get
2451 -- some stuff added to it later by the CIL backend, so always keep
2452 -- it when VM_Target = CLI_Target.
2454 Set_Is_Null_Init_Proc
(Proc_Id
);
2456 end Build_Init_Procedure
;
2458 ---------------------------
2459 -- Build_Init_Statements --
2460 ---------------------------
2462 function Build_Init_Statements
(Comp_List
: Node_Id
) return List_Id
is
2463 Check_List
: constant List_Id
:= New_List
;
2465 Statement_List
: List_Id
;
2468 Per_Object_Constraint_Components
: Boolean;
2476 function Has_Access_Constraint
(E
: Entity_Id
) return Boolean;
2477 -- Components with access discriminants that depend on the current
2478 -- instance must be initialized after all other components.
2480 ---------------------------
2481 -- Has_Access_Constraint --
2482 ---------------------------
2484 function Has_Access_Constraint
(E
: Entity_Id
) return Boolean is
2486 T
: constant Entity_Id
:= Etype
(E
);
2489 if Has_Per_Object_Constraint
(E
)
2490 and then Has_Discriminants
(T
)
2492 Disc
:= First_Discriminant
(T
);
2493 while Present
(Disc
) loop
2494 if Is_Access_Type
(Etype
(Disc
)) then
2498 Next_Discriminant
(Disc
);
2505 end Has_Access_Constraint
;
2507 -- Start of processing for Build_Init_Statements
2510 if Null_Present
(Comp_List
) then
2511 return New_List
(Make_Null_Statement
(Loc
));
2514 Statement_List
:= New_List
;
2516 -- Loop through components, skipping pragmas, in 2 steps. The first
2517 -- step deals with regular components. The second step deals with
2518 -- components have per object constraints, and no explicit initia-
2521 Per_Object_Constraint_Components
:= False;
2523 -- First step : regular components
2525 Decl
:= First_Non_Pragma
(Component_Items
(Comp_List
));
2526 while Present
(Decl
) loop
2529 (Subtype_Indication
(Component_Definition
(Decl
)), Check_List
);
2531 Id
:= Defining_Identifier
(Decl
);
2534 if Has_Access_Constraint
(Id
)
2535 and then No
(Expression
(Decl
))
2537 -- Skip processing for now and ask for a second pass
2539 Per_Object_Constraint_Components
:= True;
2542 -- Case of explicit initialization
2544 if Present
(Expression
(Decl
)) then
2545 Stmts
:= Build_Assignment
(Id
, Expression
(Decl
));
2547 -- Case of composite component with its own Init_Proc
2549 elsif not Is_Interface
(Typ
)
2550 and then Has_Non_Null_Base_Init_Proc
(Typ
)
2553 Build_Initialization_Call
2555 Make_Selected_Component
(Loc
,
2556 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
2557 Selector_Name
=> New_Occurrence_Of
(Id
, Loc
)),
2559 In_Init_Proc
=> True,
2560 Enclos_Type
=> Rec_Type
,
2561 Discr_Map
=> Discr_Map
);
2563 Clean_Task_Names
(Typ
, Proc_Id
);
2565 -- Case of component needing simple initialization
2567 elsif Component_Needs_Simple_Initialization
(Typ
) then
2570 (Id
, Get_Simple_Init_Val
(Typ
, Loc
, Esize
(Id
)));
2572 -- Nothing needed for this case
2578 if Present
(Check_List
) then
2579 Append_List_To
(Statement_List
, Check_List
);
2582 if Present
(Stmts
) then
2584 -- Add the initialization of the record controller before
2585 -- the _Parent field is attached to it when the attachment
2586 -- can occur. It does not work to simply initialize the
2587 -- controller first: it must be initialized after the parent
2588 -- if the parent holds discriminants that can be used to
2589 -- compute the offset of the controller. We assume here that
2590 -- the last statement of the initialization call is the
2591 -- attachment of the parent (see Build_Initialization_Call)
2593 if Chars
(Id
) = Name_uController
2594 and then Rec_Type
/= Etype
(Rec_Type
)
2595 and then Has_Controlled_Component
(Etype
(Rec_Type
))
2596 and then Has_New_Controlled_Component
(Rec_Type
)
2597 and then Present
(Last
(Statement_List
))
2599 Insert_List_Before
(Last
(Statement_List
), Stmts
);
2601 Append_List_To
(Statement_List
, Stmts
);
2606 Next_Non_Pragma
(Decl
);
2609 if Per_Object_Constraint_Components
then
2611 -- Second pass: components with per-object constraints
2613 Decl
:= First_Non_Pragma
(Component_Items
(Comp_List
));
2614 while Present
(Decl
) loop
2616 Id
:= Defining_Identifier
(Decl
);
2619 if Has_Access_Constraint
(Id
)
2620 and then No
(Expression
(Decl
))
2622 if Has_Non_Null_Base_Init_Proc
(Typ
) then
2623 Append_List_To
(Statement_List
,
2624 Build_Initialization_Call
(Loc
,
2625 Make_Selected_Component
(Loc
,
2626 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
2627 Selector_Name
=> New_Occurrence_Of
(Id
, Loc
)),
2629 In_Init_Proc
=> True,
2630 Enclos_Type
=> Rec_Type
,
2631 Discr_Map
=> Discr_Map
));
2633 Clean_Task_Names
(Typ
, Proc_Id
);
2635 elsif Component_Needs_Simple_Initialization
(Typ
) then
2636 Append_List_To
(Statement_List
,
2638 (Id
, Get_Simple_Init_Val
(Typ
, Loc
, Esize
(Id
))));
2642 Next_Non_Pragma
(Decl
);
2646 -- Process the variant part
2648 if Present
(Variant_Part
(Comp_List
)) then
2649 Alt_List
:= New_List
;
2650 Variant
:= First_Non_Pragma
(Variants
(Variant_Part
(Comp_List
)));
2651 while Present
(Variant
) loop
2652 Loc
:= Sloc
(Variant
);
2653 Append_To
(Alt_List
,
2654 Make_Case_Statement_Alternative
(Loc
,
2656 New_Copy_List
(Discrete_Choices
(Variant
)),
2658 Build_Init_Statements
(Component_List
(Variant
))));
2659 Next_Non_Pragma
(Variant
);
2662 -- The expression of the case statement which is a reference
2663 -- to one of the discriminants is replaced by the appropriate
2664 -- formal parameter of the initialization procedure.
2666 Append_To
(Statement_List
,
2667 Make_Case_Statement
(Loc
,
2669 New_Reference_To
(Discriminal
(
2670 Entity
(Name
(Variant_Part
(Comp_List
)))), Loc
),
2671 Alternatives
=> Alt_List
));
2674 -- For a task record type, add the task create call and calls
2675 -- to bind any interrupt (signal) entries.
2677 if Is_Task_Record_Type
(Rec_Type
) then
2679 -- In the case of the restricted run time the ATCB has already
2680 -- been preallocated.
2682 if Restricted_Profile
then
2683 Append_To
(Statement_List
,
2684 Make_Assignment_Statement
(Loc
,
2685 Name
=> Make_Selected_Component
(Loc
,
2686 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
2687 Selector_Name
=> Make_Identifier
(Loc
, Name_uTask_Id
)),
2688 Expression
=> Make_Attribute_Reference
(Loc
,
2690 Make_Selected_Component
(Loc
,
2691 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
2693 Make_Identifier
(Loc
, Name_uATCB
)),
2694 Attribute_Name
=> Name_Unchecked_Access
)));
2697 Append_To
(Statement_List
, Make_Task_Create_Call
(Rec_Type
));
2700 Task_Type
: constant Entity_Id
:=
2701 Corresponding_Concurrent_Type
(Rec_Type
);
2702 Task_Decl
: constant Node_Id
:= Parent
(Task_Type
);
2703 Task_Def
: constant Node_Id
:= Task_Definition
(Task_Decl
);
2708 if Present
(Task_Def
) then
2709 Vis_Decl
:= First
(Visible_Declarations
(Task_Def
));
2710 while Present
(Vis_Decl
) loop
2711 Loc
:= Sloc
(Vis_Decl
);
2713 if Nkind
(Vis_Decl
) = N_Attribute_Definition_Clause
then
2714 if Get_Attribute_Id
(Chars
(Vis_Decl
)) =
2717 Ent
:= Entity
(Name
(Vis_Decl
));
2719 if Ekind
(Ent
) = E_Entry
then
2720 Append_To
(Statement_List
,
2721 Make_Procedure_Call_Statement
(Loc
,
2722 Name
=> New_Reference_To
(
2723 RTE
(RE_Bind_Interrupt_To_Entry
), Loc
),
2724 Parameter_Associations
=> New_List
(
2725 Make_Selected_Component
(Loc
,
2727 Make_Identifier
(Loc
, Name_uInit
),
2729 Make_Identifier
(Loc
, Name_uTask_Id
)),
2730 Entry_Index_Expression
(
2731 Loc
, Ent
, Empty
, Task_Type
),
2732 Expression
(Vis_Decl
))));
2743 -- For a protected type, add statements generated by
2744 -- Make_Initialize_Protection.
2746 if Is_Protected_Record_Type
(Rec_Type
) then
2747 Append_List_To
(Statement_List
,
2748 Make_Initialize_Protection
(Rec_Type
));
2751 -- If no initializations when generated for component declarations
2752 -- corresponding to this Statement_List, append a null statement
2753 -- to the Statement_List to make it a valid Ada tree.
2755 if Is_Empty_List
(Statement_List
) then
2756 Append
(New_Node
(N_Null_Statement
, Loc
), Statement_List
);
2759 return Statement_List
;
2762 when RE_Not_Available
=>
2764 end Build_Init_Statements
;
2766 -------------------------
2767 -- Build_Record_Checks --
2768 -------------------------
2770 procedure Build_Record_Checks
(S
: Node_Id
; Check_List
: List_Id
) is
2771 Subtype_Mark_Id
: Entity_Id
;
2774 if Nkind
(S
) = N_Subtype_Indication
then
2775 Find_Type
(Subtype_Mark
(S
));
2776 Subtype_Mark_Id
:= Entity
(Subtype_Mark
(S
));
2778 -- Remaining processing depends on type
2780 case Ekind
(Subtype_Mark_Id
) is
2783 Constrain_Array
(S
, Check_List
);
2789 end Build_Record_Checks
;
2791 -------------------------------------------
2792 -- Component_Needs_Simple_Initialization --
2793 -------------------------------------------
2795 function Component_Needs_Simple_Initialization
2796 (T
: Entity_Id
) return Boolean
2800 Needs_Simple_Initialization
(T
)
2801 and then not Is_RTE
(T
, RE_Tag
)
2803 -- Ada 2005 (AI-251): Check also the tag of abstract interfaces
2805 and then not Is_RTE
(T
, RE_Interface_Tag
);
2806 end Component_Needs_Simple_Initialization
;
2808 ---------------------
2809 -- Constrain_Array --
2810 ---------------------
2812 procedure Constrain_Array
2814 Check_List
: List_Id
)
2816 C
: constant Node_Id
:= Constraint
(SI
);
2817 Number_Of_Constraints
: Nat
:= 0;
2822 T
:= Entity
(Subtype_Mark
(SI
));
2824 if Ekind
(T
) in Access_Kind
then
2825 T
:= Designated_Type
(T
);
2828 S
:= First
(Constraints
(C
));
2830 while Present
(S
) loop
2831 Number_Of_Constraints
:= Number_Of_Constraints
+ 1;
2835 -- In either case, the index constraint must provide a discrete
2836 -- range for each index of the array type and the type of each
2837 -- discrete range must be the same as that of the corresponding
2838 -- index. (RM 3.6.1)
2840 S
:= First
(Constraints
(C
));
2841 Index
:= First_Index
(T
);
2844 -- Apply constraints to each index type
2846 for J
in 1 .. Number_Of_Constraints
loop
2847 Constrain_Index
(Index
, S
, Check_List
);
2852 end Constrain_Array
;
2854 ---------------------
2855 -- Constrain_Index --
2856 ---------------------
2858 procedure Constrain_Index
2861 Check_List
: List_Id
)
2863 T
: constant Entity_Id
:= Etype
(Index
);
2866 if Nkind
(S
) = N_Range
then
2867 Process_Range_Expr_In_Decl
(S
, T
, Check_List
);
2869 end Constrain_Index
;
2871 --------------------------------------
2872 -- Parent_Subtype_Renaming_Discrims --
2873 --------------------------------------
2875 function Parent_Subtype_Renaming_Discrims
return Boolean is
2880 if Base_Type
(Pe
) /= Pe
then
2885 or else not Has_Discriminants
(Pe
)
2886 or else Is_Constrained
(Pe
)
2887 or else Is_Tagged_Type
(Pe
)
2892 -- If there are no explicit stored discriminants we have inherited
2893 -- the root type discriminants so far, so no renamings occurred.
2895 if First_Discriminant
(Pe
) = First_Stored_Discriminant
(Pe
) then
2899 -- Check if we have done some trivial renaming of the parent
2900 -- discriminants, i.e. something like
2902 -- type DT (X1,X2: int) is new PT (X1,X2);
2904 De
:= First_Discriminant
(Pe
);
2905 Dp
:= First_Discriminant
(Etype
(Pe
));
2907 while Present
(De
) loop
2908 pragma Assert
(Present
(Dp
));
2910 if Corresponding_Discriminant
(De
) /= Dp
then
2914 Next_Discriminant
(De
);
2915 Next_Discriminant
(Dp
);
2918 return Present
(Dp
);
2919 end Parent_Subtype_Renaming_Discrims
;
2921 ------------------------
2922 -- Requires_Init_Proc --
2923 ------------------------
2925 function Requires_Init_Proc
(Rec_Id
: Entity_Id
) return Boolean is
2926 Comp_Decl
: Node_Id
;
2931 -- Definitely do not need one if specifically suppressed
2933 if Suppress_Init_Proc
(Rec_Id
) then
2937 -- If it is a type derived from a type with unknown discriminants,
2938 -- we cannot build an initialization procedure for it.
2940 if Has_Unknown_Discriminants
(Rec_Id
) then
2944 -- Otherwise we need to generate an initialization procedure if
2945 -- Is_CPP_Class is False and at least one of the following applies:
2947 -- 1. Discriminants are present, since they need to be initialized
2948 -- with the appropriate discriminant constraint expressions.
2949 -- However, the discriminant of an unchecked union does not
2950 -- count, since the discriminant is not present.
2952 -- 2. The type is a tagged type, since the implicit Tag component
2953 -- needs to be initialized with a pointer to the dispatch table.
2955 -- 3. The type contains tasks
2957 -- 4. One or more components has an initial value
2959 -- 5. One or more components is for a type which itself requires
2960 -- an initialization procedure.
2962 -- 6. One or more components is a type that requires simple
2963 -- initialization (see Needs_Simple_Initialization), except
2964 -- that types Tag and Interface_Tag are excluded, since fields
2965 -- of these types are initialized by other means.
2967 -- 7. The type is the record type built for a task type (since at
2968 -- the very least, Create_Task must be called)
2970 -- 8. The type is the record type built for a protected type (since
2971 -- at least Initialize_Protection must be called)
2973 -- 9. The type is marked as a public entity. The reason we add this
2974 -- case (even if none of the above apply) is to properly handle
2975 -- Initialize_Scalars. If a package is compiled without an IS
2976 -- pragma, and the client is compiled with an IS pragma, then
2977 -- the client will think an initialization procedure is present
2978 -- and call it, when in fact no such procedure is required, but
2979 -- since the call is generated, there had better be a routine
2980 -- at the other end of the call, even if it does nothing!)
2982 -- Note: the reason we exclude the CPP_Class case is because in this
2983 -- case the initialization is performed in the C++ side.
2985 if Is_CPP_Class
(Rec_Id
) then
2988 elsif Is_Interface
(Rec_Id
) then
2991 elsif not Restriction_Active
(No_Initialize_Scalars
)
2992 and then Is_Public
(Rec_Id
)
2996 elsif (Has_Discriminants
(Rec_Id
)
2997 and then not Is_Unchecked_Union
(Rec_Id
))
2998 or else Is_Tagged_Type
(Rec_Id
)
2999 or else Is_Concurrent_Record_Type
(Rec_Id
)
3000 or else Has_Task
(Rec_Id
)
3005 Id
:= First_Component
(Rec_Id
);
3007 while Present
(Id
) loop
3008 Comp_Decl
:= Parent
(Id
);
3011 if Present
(Expression
(Comp_Decl
))
3012 or else Has_Non_Null_Base_Init_Proc
(Typ
)
3013 or else Component_Needs_Simple_Initialization
(Typ
)
3018 Next_Component
(Id
);
3022 end Requires_Init_Proc
;
3024 -- Start of processing for Build_Record_Init_Proc
3027 Rec_Type
:= Defining_Identifier
(N
);
3029 if Is_Value_Type
(Rec_Type
) then
3033 -- This may be full declaration of a private type, in which case
3034 -- the visible entity is a record, and the private entity has been
3035 -- exchanged with it in the private part of the current package.
3036 -- The initialization procedure is built for the record type, which
3037 -- is retrievable from the private entity.
3039 if Is_Incomplete_Or_Private_Type
(Rec_Type
) then
3040 Rec_Type
:= Underlying_Type
(Rec_Type
);
3043 -- If there are discriminants, build the discriminant map to replace
3044 -- discriminants by their discriminals in complex bound expressions.
3045 -- These only arise for the corresponding records of protected types.
3047 if Is_Concurrent_Record_Type
(Rec_Type
)
3048 and then Has_Discriminants
(Rec_Type
)
3053 Disc
:= First_Discriminant
(Rec_Type
);
3054 while Present
(Disc
) loop
3055 Append_Elmt
(Disc
, Discr_Map
);
3056 Append_Elmt
(Discriminal
(Disc
), Discr_Map
);
3057 Next_Discriminant
(Disc
);
3062 -- Derived types that have no type extension can use the initialization
3063 -- procedure of their parent and do not need a procedure of their own.
3064 -- This is only correct if there are no representation clauses for the
3065 -- type or its parent, and if the parent has in fact been frozen so
3066 -- that its initialization procedure exists.
3068 if Is_Derived_Type
(Rec_Type
)
3069 and then not Is_Tagged_Type
(Rec_Type
)
3070 and then not Is_Unchecked_Union
(Rec_Type
)
3071 and then not Has_New_Non_Standard_Rep
(Rec_Type
)
3072 and then not Parent_Subtype_Renaming_Discrims
3073 and then Has_Non_Null_Base_Init_Proc
(Etype
(Rec_Type
))
3075 Copy_TSS
(Base_Init_Proc
(Etype
(Rec_Type
)), Rec_Type
);
3077 -- Otherwise if we need an initialization procedure, then build one,
3078 -- mark it as public and inlinable and as having a completion.
3080 elsif Requires_Init_Proc
(Rec_Type
)
3081 or else Is_Unchecked_Union
(Rec_Type
)
3083 Build_Offset_To_Top_Functions
;
3084 Build_Init_Procedure
;
3085 Set_Is_Public
(Proc_Id
, Is_Public
(Pe
));
3087 -- The initialization of protected records is not worth inlining.
3088 -- In addition, when compiled for another unit for inlining purposes,
3089 -- it may make reference to entities that have not been elaborated
3090 -- yet. The initialization of controlled records contains a nested
3091 -- clean-up procedure that makes it impractical to inline as well,
3092 -- and leads to undefined symbols if inlined in a different unit.
3093 -- Similar considerations apply to task types.
3095 if not Is_Concurrent_Type
(Rec_Type
)
3096 and then not Has_Task
(Rec_Type
)
3097 and then not Controlled_Type
(Rec_Type
)
3099 Set_Is_Inlined
(Proc_Id
);
3102 Set_Is_Internal
(Proc_Id
);
3103 Set_Has_Completion
(Proc_Id
);
3105 if not Debug_Generated_Code
then
3106 Set_Debug_Info_Off
(Proc_Id
);
3110 Agg
: constant Node_Id
:=
3111 Build_Equivalent_Record_Aggregate
(Rec_Type
);
3113 procedure Collect_Itypes
(Comp
: Node_Id
);
3114 -- Generate references to itypes in the aggregate, because
3115 -- the first use of the aggregate may be in a nested scope.
3117 --------------------
3118 -- Collect_Itypes --
3119 --------------------
3121 procedure Collect_Itypes
(Comp
: Node_Id
) is
3127 if Is_Array_Type
(Etype
(Comp
))
3128 and then Is_Itype
(Etype
(Comp
))
3130 Typ
:= Etype
(Comp
);
3131 Ref
:= Make_Itype_Reference
(Loc
);
3132 Set_Itype
(Ref
, Typ
);
3133 Append_Freeze_Action
(Rec_Type
, Ref
);
3135 Ref
:= Make_Itype_Reference
(Loc
);
3136 Set_Itype
(Ref
, Etype
(First_Index
(Typ
)));
3137 Append_Freeze_Action
(Rec_Type
, Ref
);
3139 Sub_Aggr
:= First
(Expressions
(Comp
));
3141 -- Recurse on nested arrays
3143 while Present
(Sub_Aggr
) loop
3144 Collect_Itypes
(Sub_Aggr
);
3151 -- If there is a static initialization aggregate for the type,
3152 -- generate itype references for the types of its (sub)components,
3153 -- to prevent out-of-scope errors in the resulting tree.
3154 -- The aggregate may have been rewritten as a Raise node, in which
3155 -- case there are no relevant itypes.
3158 and then Nkind
(Agg
) = N_Aggregate
3160 Set_Static_Initialization
(Proc_Id
, Agg
);
3165 Comp
:= First
(Component_Associations
(Agg
));
3166 while Present
(Comp
) loop
3167 Collect_Itypes
(Expression
(Comp
));
3174 end Build_Record_Init_Proc
;
3176 ----------------------------
3177 -- Build_Slice_Assignment --
3178 ----------------------------
3180 -- Generates the following subprogram:
3183 -- (Source, Target : Array_Type,
3184 -- Left_Lo, Left_Hi : Index;
3185 -- Right_Lo, Right_Hi : Index;
3202 -- exit when Li1 < Left_Lo;
3204 -- exit when Li1 > Left_Hi;
3207 -- Target (Li1) := Source (Ri1);
3210 -- Li1 := Index'pred (Li1);
3211 -- Ri1 := Index'pred (Ri1);
3213 -- Li1 := Index'succ (Li1);
3214 -- Ri1 := Index'succ (Ri1);
3219 procedure Build_Slice_Assignment
(Typ
: Entity_Id
) is
3220 Loc
: constant Source_Ptr
:= Sloc
(Typ
);
3221 Index
: constant Entity_Id
:= Base_Type
(Etype
(First_Index
(Typ
)));
3223 -- Build formal parameters of procedure
3225 Larray
: constant Entity_Id
:=
3226 Make_Defining_Identifier
3227 (Loc
, Chars
=> New_Internal_Name
('A'));
3228 Rarray
: constant Entity_Id
:=
3229 Make_Defining_Identifier
3230 (Loc
, Chars
=> New_Internal_Name
('R'));
3231 Left_Lo
: constant Entity_Id
:=
3232 Make_Defining_Identifier
3233 (Loc
, Chars
=> New_Internal_Name
('L'));
3234 Left_Hi
: constant Entity_Id
:=
3235 Make_Defining_Identifier
3236 (Loc
, Chars
=> New_Internal_Name
('L'));
3237 Right_Lo
: constant Entity_Id
:=
3238 Make_Defining_Identifier
3239 (Loc
, Chars
=> New_Internal_Name
('R'));
3240 Right_Hi
: constant Entity_Id
:=
3241 Make_Defining_Identifier
3242 (Loc
, Chars
=> New_Internal_Name
('R'));
3243 Rev
: constant Entity_Id
:=
3244 Make_Defining_Identifier
3245 (Loc
, Chars
=> New_Internal_Name
('D'));
3246 Proc_Name
: constant Entity_Id
:=
3247 Make_Defining_Identifier
(Loc
,
3248 Chars
=> Make_TSS_Name
(Typ
, TSS_Slice_Assign
));
3250 Lnn
: constant Entity_Id
:=
3251 Make_Defining_Identifier
(Loc
, New_Internal_Name
('L'));
3252 Rnn
: constant Entity_Id
:=
3253 Make_Defining_Identifier
(Loc
, New_Internal_Name
('R'));
3254 -- Subscripts for left and right sides
3261 -- Build declarations for indices
3266 Make_Object_Declaration
(Loc
,
3267 Defining_Identifier
=> Lnn
,
3268 Object_Definition
=>
3269 New_Occurrence_Of
(Index
, Loc
)));
3272 Make_Object_Declaration
(Loc
,
3273 Defining_Identifier
=> Rnn
,
3274 Object_Definition
=>
3275 New_Occurrence_Of
(Index
, Loc
)));
3279 -- Build initializations for indices
3282 F_Init
: constant List_Id
:= New_List
;
3283 B_Init
: constant List_Id
:= New_List
;
3287 Make_Assignment_Statement
(Loc
,
3288 Name
=> New_Occurrence_Of
(Lnn
, Loc
),
3289 Expression
=> New_Occurrence_Of
(Left_Lo
, Loc
)));
3292 Make_Assignment_Statement
(Loc
,
3293 Name
=> New_Occurrence_Of
(Rnn
, Loc
),
3294 Expression
=> New_Occurrence_Of
(Right_Lo
, Loc
)));
3297 Make_Assignment_Statement
(Loc
,
3298 Name
=> New_Occurrence_Of
(Lnn
, Loc
),
3299 Expression
=> New_Occurrence_Of
(Left_Hi
, Loc
)));
3302 Make_Assignment_Statement
(Loc
,
3303 Name
=> New_Occurrence_Of
(Rnn
, Loc
),
3304 Expression
=> New_Occurrence_Of
(Right_Hi
, Loc
)));
3307 Make_If_Statement
(Loc
,
3308 Condition
=> New_Occurrence_Of
(Rev
, Loc
),
3309 Then_Statements
=> B_Init
,
3310 Else_Statements
=> F_Init
));
3313 -- Now construct the assignment statement
3316 Make_Loop_Statement
(Loc
,
3317 Statements
=> New_List
(
3318 Make_Assignment_Statement
(Loc
,
3320 Make_Indexed_Component
(Loc
,
3321 Prefix
=> New_Occurrence_Of
(Larray
, Loc
),
3322 Expressions
=> New_List
(New_Occurrence_Of
(Lnn
, Loc
))),
3324 Make_Indexed_Component
(Loc
,
3325 Prefix
=> New_Occurrence_Of
(Rarray
, Loc
),
3326 Expressions
=> New_List
(New_Occurrence_Of
(Rnn
, Loc
))))),
3327 End_Label
=> Empty
);
3329 -- Build exit condition
3332 F_Ass
: constant List_Id
:= New_List
;
3333 B_Ass
: constant List_Id
:= New_List
;
3337 Make_Exit_Statement
(Loc
,
3340 Left_Opnd
=> New_Occurrence_Of
(Lnn
, Loc
),
3341 Right_Opnd
=> New_Occurrence_Of
(Left_Hi
, Loc
))));
3344 Make_Exit_Statement
(Loc
,
3347 Left_Opnd
=> New_Occurrence_Of
(Lnn
, Loc
),
3348 Right_Opnd
=> New_Occurrence_Of
(Left_Lo
, Loc
))));
3350 Prepend_To
(Statements
(Loops
),
3351 Make_If_Statement
(Loc
,
3352 Condition
=> New_Occurrence_Of
(Rev
, Loc
),
3353 Then_Statements
=> B_Ass
,
3354 Else_Statements
=> F_Ass
));
3357 -- Build the increment/decrement statements
3360 F_Ass
: constant List_Id
:= New_List
;
3361 B_Ass
: constant List_Id
:= New_List
;
3365 Make_Assignment_Statement
(Loc
,
3366 Name
=> New_Occurrence_Of
(Lnn
, Loc
),
3368 Make_Attribute_Reference
(Loc
,
3370 New_Occurrence_Of
(Index
, Loc
),
3371 Attribute_Name
=> Name_Succ
,
3372 Expressions
=> New_List
(
3373 New_Occurrence_Of
(Lnn
, Loc
)))));
3376 Make_Assignment_Statement
(Loc
,
3377 Name
=> New_Occurrence_Of
(Rnn
, Loc
),
3379 Make_Attribute_Reference
(Loc
,
3381 New_Occurrence_Of
(Index
, Loc
),
3382 Attribute_Name
=> Name_Succ
,
3383 Expressions
=> New_List
(
3384 New_Occurrence_Of
(Rnn
, Loc
)))));
3387 Make_Assignment_Statement
(Loc
,
3388 Name
=> New_Occurrence_Of
(Lnn
, Loc
),
3390 Make_Attribute_Reference
(Loc
,
3392 New_Occurrence_Of
(Index
, Loc
),
3393 Attribute_Name
=> Name_Pred
,
3394 Expressions
=> New_List
(
3395 New_Occurrence_Of
(Lnn
, Loc
)))));
3398 Make_Assignment_Statement
(Loc
,
3399 Name
=> New_Occurrence_Of
(Rnn
, Loc
),
3401 Make_Attribute_Reference
(Loc
,
3403 New_Occurrence_Of
(Index
, Loc
),
3404 Attribute_Name
=> Name_Pred
,
3405 Expressions
=> New_List
(
3406 New_Occurrence_Of
(Rnn
, Loc
)))));
3408 Append_To
(Statements
(Loops
),
3409 Make_If_Statement
(Loc
,
3410 Condition
=> New_Occurrence_Of
(Rev
, Loc
),
3411 Then_Statements
=> B_Ass
,
3412 Else_Statements
=> F_Ass
));
3415 Append_To
(Stats
, Loops
);
3419 Formals
: List_Id
:= New_List
;
3422 Formals
:= New_List
(
3423 Make_Parameter_Specification
(Loc
,
3424 Defining_Identifier
=> Larray
,
3425 Out_Present
=> True,
3427 New_Reference_To
(Base_Type
(Typ
), Loc
)),
3429 Make_Parameter_Specification
(Loc
,
3430 Defining_Identifier
=> Rarray
,
3432 New_Reference_To
(Base_Type
(Typ
), Loc
)),
3434 Make_Parameter_Specification
(Loc
,
3435 Defining_Identifier
=> Left_Lo
,
3437 New_Reference_To
(Index
, Loc
)),
3439 Make_Parameter_Specification
(Loc
,
3440 Defining_Identifier
=> Left_Hi
,
3442 New_Reference_To
(Index
, Loc
)),
3444 Make_Parameter_Specification
(Loc
,
3445 Defining_Identifier
=> Right_Lo
,
3447 New_Reference_To
(Index
, Loc
)),
3449 Make_Parameter_Specification
(Loc
,
3450 Defining_Identifier
=> Right_Hi
,
3452 New_Reference_To
(Index
, Loc
)));
3455 Make_Parameter_Specification
(Loc
,
3456 Defining_Identifier
=> Rev
,
3458 New_Reference_To
(Standard_Boolean
, Loc
)));
3461 Make_Procedure_Specification
(Loc
,
3462 Defining_Unit_Name
=> Proc_Name
,
3463 Parameter_Specifications
=> Formals
);
3466 Make_Subprogram_Body
(Loc
,
3467 Specification
=> Spec
,
3468 Declarations
=> Decls
,
3469 Handled_Statement_Sequence
=>
3470 Make_Handled_Sequence_Of_Statements
(Loc
,
3471 Statements
=> Stats
)));
3474 Set_TSS
(Typ
, Proc_Name
);
3475 Set_Is_Pure
(Proc_Name
);
3476 end Build_Slice_Assignment
;
3478 ------------------------------------
3479 -- Build_Variant_Record_Equality --
3480 ------------------------------------
3484 -- function _Equality (X, Y : T) return Boolean is
3486 -- -- Compare discriminants
3488 -- if False or else X.D1 /= Y.D1 or else X.D2 /= Y.D2 then
3492 -- -- Compare components
3494 -- if False or else X.C1 /= Y.C1 or else X.C2 /= Y.C2 then
3498 -- -- Compare variant part
3502 -- if False or else X.C2 /= Y.C2 or else X.C3 /= Y.C3 then
3507 -- if False or else X.Cn /= Y.Cn then
3515 procedure Build_Variant_Record_Equality
(Typ
: Entity_Id
) is
3516 Loc
: constant Source_Ptr
:= Sloc
(Typ
);
3518 F
: constant Entity_Id
:=
3519 Make_Defining_Identifier
(Loc
,
3520 Chars
=> Make_TSS_Name
(Typ
, TSS_Composite_Equality
));
3522 X
: constant Entity_Id
:=
3523 Make_Defining_Identifier
(Loc
,
3526 Y
: constant Entity_Id
:=
3527 Make_Defining_Identifier
(Loc
,
3530 Def
: constant Node_Id
:= Parent
(Typ
);
3531 Comps
: constant Node_Id
:= Component_List
(Type_Definition
(Def
));
3532 Stmts
: constant List_Id
:= New_List
;
3533 Pspecs
: constant List_Id
:= New_List
;
3536 -- Derived Unchecked_Union types no longer inherit the equality function
3539 if Is_Derived_Type
(Typ
)
3540 and then not Is_Unchecked_Union
(Typ
)
3541 and then not Has_New_Non_Standard_Rep
(Typ
)
3544 Parent_Eq
: constant Entity_Id
:=
3545 TSS
(Root_Type
(Typ
), TSS_Composite_Equality
);
3548 if Present
(Parent_Eq
) then
3549 Copy_TSS
(Parent_Eq
, Typ
);
3556 Make_Subprogram_Body
(Loc
,
3558 Make_Function_Specification
(Loc
,
3559 Defining_Unit_Name
=> F
,
3560 Parameter_Specifications
=> Pspecs
,
3561 Result_Definition
=> New_Reference_To
(Standard_Boolean
, Loc
)),
3562 Declarations
=> New_List
,
3563 Handled_Statement_Sequence
=>
3564 Make_Handled_Sequence_Of_Statements
(Loc
,
3565 Statements
=> Stmts
)));
3568 Make_Parameter_Specification
(Loc
,
3569 Defining_Identifier
=> X
,
3570 Parameter_Type
=> New_Reference_To
(Typ
, Loc
)));
3573 Make_Parameter_Specification
(Loc
,
3574 Defining_Identifier
=> Y
,
3575 Parameter_Type
=> New_Reference_To
(Typ
, Loc
)));
3577 -- Unchecked_Unions require additional machinery to support equality.
3578 -- Two extra parameters (A and B) are added to the equality function
3579 -- parameter list in order to capture the inferred values of the
3580 -- discriminants in later calls.
3582 if Is_Unchecked_Union
(Typ
) then
3584 Discr_Type
: constant Node_Id
:= Etype
(First_Discriminant
(Typ
));
3586 A
: constant Node_Id
:=
3587 Make_Defining_Identifier
(Loc
,
3590 B
: constant Node_Id
:=
3591 Make_Defining_Identifier
(Loc
,
3595 -- Add A and B to the parameter list
3598 Make_Parameter_Specification
(Loc
,
3599 Defining_Identifier
=> A
,
3600 Parameter_Type
=> New_Reference_To
(Discr_Type
, Loc
)));
3603 Make_Parameter_Specification
(Loc
,
3604 Defining_Identifier
=> B
,
3605 Parameter_Type
=> New_Reference_To
(Discr_Type
, Loc
)));
3607 -- Generate the following header code to compare the inferred
3615 Make_If_Statement
(Loc
,
3618 Left_Opnd
=> New_Reference_To
(A
, Loc
),
3619 Right_Opnd
=> New_Reference_To
(B
, Loc
)),
3620 Then_Statements
=> New_List
(
3621 Make_Simple_Return_Statement
(Loc
,
3622 Expression
=> New_Occurrence_Of
(Standard_False
, Loc
)))));
3624 -- Generate component-by-component comparison. Note that we must
3625 -- propagate one of the inferred discriminant formals to act as
3626 -- the case statement switch.
3628 Append_List_To
(Stmts
,
3629 Make_Eq_Case
(Typ
, Comps
, A
));
3633 -- Normal case (not unchecked union)
3638 Discriminant_Specifications
(Def
)));
3640 Append_List_To
(Stmts
,
3641 Make_Eq_Case
(Typ
, Comps
));
3645 Make_Simple_Return_Statement
(Loc
,
3646 Expression
=> New_Reference_To
(Standard_True
, Loc
)));
3651 if not Debug_Generated_Code
then
3652 Set_Debug_Info_Off
(F
);
3654 end Build_Variant_Record_Equality
;
3656 -----------------------------
3657 -- Check_Stream_Attributes --
3658 -----------------------------
3660 procedure Check_Stream_Attributes
(Typ
: Entity_Id
) is
3662 Par_Read
: constant Boolean :=
3663 Stream_Attribute_Available
(Typ
, TSS_Stream_Read
)
3664 and then not Has_Specified_Stream_Read
(Typ
);
3665 Par_Write
: constant Boolean :=
3666 Stream_Attribute_Available
(Typ
, TSS_Stream_Write
)
3667 and then not Has_Specified_Stream_Write
(Typ
);
3669 procedure Check_Attr
(Nam
: Name_Id
; TSS_Nam
: TSS_Name_Type
);
3670 -- Check that Comp has a user-specified Nam stream attribute
3676 procedure Check_Attr
(Nam
: Name_Id
; TSS_Nam
: TSS_Name_Type
) is
3678 if not Stream_Attribute_Available
(Etype
(Comp
), TSS_Nam
) then
3679 Error_Msg_Name_1
:= Nam
;
3681 ("|component& in limited extension must have% attribute", Comp
);
3685 -- Start of processing for Check_Stream_Attributes
3688 if Par_Read
or else Par_Write
then
3689 Comp
:= First_Component
(Typ
);
3690 while Present
(Comp
) loop
3691 if Comes_From_Source
(Comp
)
3692 and then Original_Record_Component
(Comp
) = Comp
3693 and then Is_Limited_Type
(Etype
(Comp
))
3696 Check_Attr
(Name_Read
, TSS_Stream_Read
);
3700 Check_Attr
(Name_Write
, TSS_Stream_Write
);
3704 Next_Component
(Comp
);
3707 end Check_Stream_Attributes
;
3709 -----------------------------
3710 -- Expand_Record_Extension --
3711 -----------------------------
3713 -- Add a field _parent at the beginning of the record extension. This is
3714 -- used to implement inheritance. Here are some examples of expansion:
3716 -- 1. no discriminants
3717 -- type T2 is new T1 with null record;
3719 -- type T2 is new T1 with record
3723 -- 2. renamed discriminants
3724 -- type T2 (B, C : Int) is new T1 (A => B) with record
3725 -- _Parent : T1 (A => B);
3729 -- 3. inherited discriminants
3730 -- type T2 is new T1 with record -- discriminant A inherited
3731 -- _Parent : T1 (A);
3735 procedure Expand_Record_Extension
(T
: Entity_Id
; Def
: Node_Id
) is
3736 Indic
: constant Node_Id
:= Subtype_Indication
(Def
);
3737 Loc
: constant Source_Ptr
:= Sloc
(Def
);
3738 Rec_Ext_Part
: Node_Id
:= Record_Extension_Part
(Def
);
3739 Par_Subtype
: Entity_Id
;
3740 Comp_List
: Node_Id
;
3741 Comp_Decl
: Node_Id
;
3744 List_Constr
: constant List_Id
:= New_List
;
3747 -- Expand_Record_Extension is called directly from the semantics, so
3748 -- we must check to see whether expansion is active before proceeding
3750 if not Expander_Active
then
3754 -- This may be a derivation of an untagged private type whose full
3755 -- view is tagged, in which case the Derived_Type_Definition has no
3756 -- extension part. Build an empty one now.
3758 if No
(Rec_Ext_Part
) then
3760 Make_Record_Definition
(Loc
,
3762 Component_List
=> Empty
,
3763 Null_Present
=> True);
3765 Set_Record_Extension_Part
(Def
, Rec_Ext_Part
);
3766 Mark_Rewrite_Insertion
(Rec_Ext_Part
);
3769 Comp_List
:= Component_List
(Rec_Ext_Part
);
3771 Parent_N
:= Make_Defining_Identifier
(Loc
, Name_uParent
);
3773 -- If the derived type inherits its discriminants the type of the
3774 -- _parent field must be constrained by the inherited discriminants
3776 if Has_Discriminants
(T
)
3777 and then Nkind
(Indic
) /= N_Subtype_Indication
3778 and then not Is_Constrained
(Entity
(Indic
))
3780 D
:= First_Discriminant
(T
);
3781 while Present
(D
) loop
3782 Append_To
(List_Constr
, New_Occurrence_Of
(D
, Loc
));
3783 Next_Discriminant
(D
);
3788 Make_Subtype_Indication
(Loc
,
3789 Subtype_Mark
=> New_Reference_To
(Entity
(Indic
), Loc
),
3791 Make_Index_Or_Discriminant_Constraint
(Loc
,
3792 Constraints
=> List_Constr
)),
3795 -- Otherwise the original subtype_indication is just what is needed
3798 Par_Subtype
:= Process_Subtype
(New_Copy_Tree
(Indic
), Def
);
3801 Set_Parent_Subtype
(T
, Par_Subtype
);
3804 Make_Component_Declaration
(Loc
,
3805 Defining_Identifier
=> Parent_N
,
3806 Component_Definition
=>
3807 Make_Component_Definition
(Loc
,
3808 Aliased_Present
=> False,
3809 Subtype_Indication
=> New_Reference_To
(Par_Subtype
, Loc
)));
3811 if Null_Present
(Rec_Ext_Part
) then
3812 Set_Component_List
(Rec_Ext_Part
,
3813 Make_Component_List
(Loc
,
3814 Component_Items
=> New_List
(Comp_Decl
),
3815 Variant_Part
=> Empty
,
3816 Null_Present
=> False));
3817 Set_Null_Present
(Rec_Ext_Part
, False);
3819 elsif Null_Present
(Comp_List
)
3820 or else Is_Empty_List
(Component_Items
(Comp_List
))
3822 Set_Component_Items
(Comp_List
, New_List
(Comp_Decl
));
3823 Set_Null_Present
(Comp_List
, False);
3826 Insert_Before
(First
(Component_Items
(Comp_List
)), Comp_Decl
);
3829 Analyze
(Comp_Decl
);
3830 end Expand_Record_Extension
;
3832 ------------------------------------
3833 -- Expand_N_Full_Type_Declaration --
3834 ------------------------------------
3836 procedure Expand_N_Full_Type_Declaration
(N
: Node_Id
) is
3837 Def_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
3838 B_Id
: constant Entity_Id
:= Base_Type
(Def_Id
);
3842 procedure Build_Master
(Def_Id
: Entity_Id
);
3843 -- Create the master associated with Def_Id
3849 procedure Build_Master
(Def_Id
: Entity_Id
) is
3851 -- Anonymous access types are created for the components of the
3852 -- record parameter for an entry declaration. No master is created
3855 if Has_Task
(Designated_Type
(Def_Id
))
3856 and then Comes_From_Source
(N
)
3858 Build_Master_Entity
(Def_Id
);
3859 Build_Master_Renaming
(Parent
(Def_Id
), Def_Id
);
3861 -- Create a class-wide master because a Master_Id must be generated
3862 -- for access-to-limited-class-wide types whose root may be extended
3863 -- with task components, and for access-to-limited-interfaces because
3864 -- they can be used to reference tasks implementing such interface.
3866 elsif Is_Class_Wide_Type
(Designated_Type
(Def_Id
))
3867 and then (Is_Limited_Type
(Designated_Type
(Def_Id
))
3869 (Is_Interface
(Designated_Type
(Def_Id
))
3871 Is_Limited_Interface
(Designated_Type
(Def_Id
))))
3872 and then Tasking_Allowed
3874 -- Do not create a class-wide master for types whose convention is
3875 -- Java since these types cannot embed Ada tasks anyway. Note that
3876 -- the following test cannot catch the following case:
3878 -- package java.lang.Object is
3879 -- type Typ is tagged limited private;
3880 -- type Ref is access all Typ'Class;
3882 -- type Typ is tagged limited ...;
3883 -- pragma Convention (Typ, Java)
3886 -- Because the convention appears after we have done the
3887 -- processing for type Ref.
3889 and then Convention
(Designated_Type
(Def_Id
)) /= Convention_Java
3890 and then Convention
(Designated_Type
(Def_Id
)) /= Convention_CIL
3892 Build_Class_Wide_Master
(Def_Id
);
3896 -- Start of processing for Expand_N_Full_Type_Declaration
3899 if Is_Access_Type
(Def_Id
) then
3900 Build_Master
(Def_Id
);
3902 if Ekind
(Def_Id
) = E_Access_Protected_Subprogram_Type
then
3903 Expand_Access_Protected_Subprogram_Type
(N
);
3906 elsif Ada_Version
>= Ada_05
3907 and then Is_Array_Type
(Def_Id
)
3908 and then Is_Access_Type
(Component_Type
(Def_Id
))
3909 and then Ekind
(Component_Type
(Def_Id
)) = E_Anonymous_Access_Type
3911 Build_Master
(Component_Type
(Def_Id
));
3913 elsif Has_Task
(Def_Id
) then
3914 Expand_Previous_Access_Type
(Def_Id
);
3916 elsif Ada_Version
>= Ada_05
3918 (Is_Record_Type
(Def_Id
)
3919 or else (Is_Array_Type
(Def_Id
)
3920 and then Is_Record_Type
(Component_Type
(Def_Id
))))
3928 -- Look for the first anonymous access type component
3930 if Is_Array_Type
(Def_Id
) then
3931 Comp
:= First_Entity
(Component_Type
(Def_Id
));
3933 Comp
:= First_Entity
(Def_Id
);
3936 while Present
(Comp
) loop
3937 Typ
:= Etype
(Comp
);
3939 exit when Is_Access_Type
(Typ
)
3940 and then Ekind
(Typ
) = E_Anonymous_Access_Type
;
3945 -- If found we add a renaming declaration of master_id and we
3946 -- associate it to each anonymous access type component. Do
3947 -- nothing if the access type already has a master. This will be
3948 -- the case if the array type is the packed array created for a
3949 -- user-defined array type T, where the master_id is created when
3950 -- expanding the declaration for T.
3953 and then Ekind
(Typ
) = E_Anonymous_Access_Type
3954 and then not Restriction_Active
(No_Task_Hierarchy
)
3955 and then No
(Master_Id
(Typ
))
3957 -- Do not consider run-times with no tasking support
3959 and then RTE_Available
(RE_Current_Master
)
3960 and then Has_Task
(Non_Limited_Designated_Type
(Typ
))
3962 Build_Master_Entity
(Def_Id
);
3963 M_Id
:= Build_Master_Renaming
(N
, Def_Id
);
3965 if Is_Array_Type
(Def_Id
) then
3966 Comp
:= First_Entity
(Component_Type
(Def_Id
));
3968 Comp
:= First_Entity
(Def_Id
);
3971 while Present
(Comp
) loop
3972 Typ
:= Etype
(Comp
);
3974 if Is_Access_Type
(Typ
)
3975 and then Ekind
(Typ
) = E_Anonymous_Access_Type
3977 Set_Master_Id
(Typ
, M_Id
);
3986 Par_Id
:= Etype
(B_Id
);
3988 -- The parent type is private then we need to inherit any TSS operations
3989 -- from the full view.
3991 if Ekind
(Par_Id
) in Private_Kind
3992 and then Present
(Full_View
(Par_Id
))
3994 Par_Id
:= Base_Type
(Full_View
(Par_Id
));
3997 if Nkind
(Type_Definition
(Original_Node
(N
))) =
3998 N_Derived_Type_Definition
3999 and then not Is_Tagged_Type
(Def_Id
)
4000 and then Present
(Freeze_Node
(Par_Id
))
4001 and then Present
(TSS_Elist
(Freeze_Node
(Par_Id
)))
4003 Ensure_Freeze_Node
(B_Id
);
4004 FN
:= Freeze_Node
(B_Id
);
4006 if No
(TSS_Elist
(FN
)) then
4007 Set_TSS_Elist
(FN
, New_Elmt_List
);
4011 T_E
: constant Elist_Id
:= TSS_Elist
(FN
);
4015 Elmt
:= First_Elmt
(TSS_Elist
(Freeze_Node
(Par_Id
)));
4016 while Present
(Elmt
) loop
4017 if Chars
(Node
(Elmt
)) /= Name_uInit
then
4018 Append_Elmt
(Node
(Elmt
), T_E
);
4024 -- If the derived type itself is private with a full view, then
4025 -- associate the full view with the inherited TSS_Elist as well.
4027 if Ekind
(B_Id
) in Private_Kind
4028 and then Present
(Full_View
(B_Id
))
4030 Ensure_Freeze_Node
(Base_Type
(Full_View
(B_Id
)));
4032 (Freeze_Node
(Base_Type
(Full_View
(B_Id
))), TSS_Elist
(FN
));
4036 end Expand_N_Full_Type_Declaration
;
4038 ---------------------------------
4039 -- Expand_N_Object_Declaration --
4040 ---------------------------------
4042 -- First we do special processing for objects of a tagged type where this
4043 -- is the point at which the type is frozen. The creation of the dispatch
4044 -- table and the initialization procedure have to be deferred to this
4045 -- point, since we reference previously declared primitive subprograms.
4047 -- For all types, we call an initialization procedure if there is one
4049 procedure Expand_N_Object_Declaration
(N
: Node_Id
) is
4050 Def_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
4051 Expr
: constant Node_Id
:= Expression
(N
);
4052 Loc
: constant Source_Ptr
:= Sloc
(N
);
4053 Typ
: constant Entity_Id
:= Etype
(Def_Id
);
4054 Base_Typ
: constant Entity_Id
:= Base_Type
(Typ
);
4058 BIP_Call
: Boolean := False;
4060 Init_After
: Node_Id
:= N
;
4061 -- Node after which the init proc call is to be inserted. This is
4062 -- normally N, except for the case of a shared passive variable, in
4063 -- which case the init proc call must be inserted only after the bodies
4064 -- of the shared variable procedures have been seen.
4067 -- Don't do anything for deferred constants. All proper actions will
4068 -- be expanded during the full declaration.
4070 if No
(Expr
) and Constant_Present
(N
) then
4074 -- Force construction of dispatch tables of library level tagged types
4076 if VM_Target
= No_VM
4077 and then Static_Dispatch_Tables
4078 and then Is_Library_Level_Entity
(Def_Id
)
4079 and then Is_Library_Level_Tagged_Type
(Base_Typ
)
4080 and then (Ekind
(Base_Typ
) = E_Record_Type
4081 or else Ekind
(Base_Typ
) = E_Protected_Type
4082 or else Ekind
(Base_Typ
) = E_Task_Type
)
4083 and then not Has_Dispatch_Table
(Base_Typ
)
4086 New_Nodes
: List_Id
:= No_List
;
4089 if Is_Concurrent_Type
(Base_Typ
) then
4090 New_Nodes
:= Make_DT
(Corresponding_Record_Type
(Base_Typ
), N
);
4092 New_Nodes
:= Make_DT
(Base_Typ
, N
);
4095 if not Is_Empty_List
(New_Nodes
) then
4096 Insert_List_Before
(N
, New_Nodes
);
4101 -- Make shared memory routines for shared passive variable
4103 if Is_Shared_Passive
(Def_Id
) then
4104 Init_After
:= Make_Shared_Var_Procs
(N
);
4107 -- If tasks being declared, make sure we have an activation chain
4108 -- defined for the tasks (has no effect if we already have one), and
4109 -- also that a Master variable is established and that the appropriate
4110 -- enclosing construct is established as a task master.
4112 if Has_Task
(Typ
) then
4113 Build_Activation_Chain_Entity
(N
);
4114 Build_Master_Entity
(Def_Id
);
4117 -- Build a list controller for declarations where the type is anonymous
4118 -- access and the designated type is controlled. Only declarations from
4119 -- source files receive such controllers in order to provide the same
4120 -- lifespan for any potential coextensions that may be associated with
4121 -- the object. Finalization lists of internal controlled anonymous
4122 -- access objects are already handled in Expand_N_Allocator.
4124 if Comes_From_Source
(N
)
4125 and then Ekind
(Typ
) = E_Anonymous_Access_Type
4126 and then Is_Controlled
(Directly_Designated_Type
(Typ
))
4127 and then No
(Associated_Final_Chain
(Typ
))
4129 Build_Final_List
(N
, Typ
);
4132 -- Default initialization required, and no expression present
4136 -- Expand Initialize call for controlled objects. One may wonder why
4137 -- the Initialize Call is not done in the regular Init procedure
4138 -- attached to the record type. That's because the init procedure is
4139 -- recursively called on each component, including _Parent, thus the
4140 -- Init call for a controlled object would generate not only one
4141 -- Initialize call as it is required but one for each ancestor of
4142 -- its type. This processing is suppressed if No_Initialization set.
4144 if not Controlled_Type
(Typ
)
4145 or else No_Initialization
(N
)
4149 elsif not Abort_Allowed
4150 or else not Comes_From_Source
(N
)
4152 Insert_Actions_After
(Init_After
,
4154 Ref
=> New_Occurrence_Of
(Def_Id
, Loc
),
4155 Typ
=> Base_Type
(Typ
),
4156 Flist_Ref
=> Find_Final_List
(Def_Id
),
4157 With_Attach
=> Make_Integer_Literal
(Loc
, 1)));
4162 -- We need to protect the initialize call
4166 -- Initialize (...);
4168 -- Undefer_Abort.all;
4171 -- ??? this won't protect the initialize call for controlled
4172 -- components which are part of the init proc, so this block
4173 -- should probably also contain the call to _init_proc but this
4174 -- requires some code reorganization...
4177 L
: constant List_Id
:=
4179 (Ref
=> New_Occurrence_Of
(Def_Id
, Loc
),
4180 Typ
=> Base_Type
(Typ
),
4181 Flist_Ref
=> Find_Final_List
(Def_Id
),
4182 With_Attach
=> Make_Integer_Literal
(Loc
, 1));
4184 Blk
: constant Node_Id
:=
4185 Make_Block_Statement
(Loc
,
4186 Handled_Statement_Sequence
=>
4187 Make_Handled_Sequence_Of_Statements
(Loc
, L
));
4190 Prepend_To
(L
, Build_Runtime_Call
(Loc
, RE_Abort_Defer
));
4191 Set_At_End_Proc
(Handled_Statement_Sequence
(Blk
),
4192 New_Occurrence_Of
(RTE
(RE_Abort_Undefer_Direct
), Loc
));
4193 Insert_Actions_After
(Init_After
, New_List
(Blk
));
4194 Expand_At_End_Handler
4195 (Handled_Statement_Sequence
(Blk
), Entity
(Identifier
(Blk
)));
4199 -- Call type initialization procedure if there is one. We build the
4200 -- call and put it immediately after the object declaration, so that
4201 -- it will be expanded in the usual manner. Note that this will
4202 -- result in proper handling of defaulted discriminants.
4204 -- Need call if there is a base init proc
4206 if Has_Non_Null_Base_Init_Proc
(Typ
)
4208 -- Suppress call if No_Initialization set on declaration
4210 and then not No_Initialization
(N
)
4212 -- Suppress call for special case of value type for VM
4214 and then not Is_Value_Type
(Typ
)
4216 -- Suppress call if Suppress_Init_Proc set on the type. This is
4217 -- needed for the derived type case, where Suppress_Initialization
4218 -- may be set for the derived type, even if there is an init proc
4219 -- defined for the root type.
4221 and then not Suppress_Init_Proc
(Typ
)
4223 -- The call to the initialization procedure does NOT freeze the
4224 -- object being initialized. This is because the call is not a
4225 -- source level call. This works fine, because the only possible
4226 -- statements depending on freeze status that can appear after the
4227 -- _Init call are rep clauses which can safely appear after actual
4228 -- references to the object.
4230 Id_Ref
:= New_Reference_To
(Def_Id
, Loc
);
4231 Set_Must_Not_Freeze
(Id_Ref
);
4232 Set_Assignment_OK
(Id_Ref
);
4235 Init_Expr
: constant Node_Id
:=
4236 Static_Initialization
(Base_Init_Proc
(Typ
));
4238 if Present
(Init_Expr
) then
4240 (N
, New_Copy_Tree
(Init_Expr
, New_Scope
=> Current_Scope
));
4243 Initialization_Warning
(Id_Ref
);
4245 Insert_Actions_After
(Init_After
,
4246 Build_Initialization_Call
(Loc
, Id_Ref
, Typ
));
4250 -- If simple initialization is required, then set an appropriate
4251 -- simple initialization expression in place. This special
4252 -- initialization is required even though No_Init_Flag is present,
4253 -- but is not needed if there was an explicit initialization.
4255 -- An internally generated temporary needs no initialization because
4256 -- it will be assigned subsequently. In particular, there is no point
4257 -- in applying Initialize_Scalars to such a temporary.
4259 elsif Needs_Simple_Initialization
(Typ
)
4260 and then not Is_Internal
(Def_Id
)
4261 and then not Has_Init_Expression
(N
)
4263 Set_No_Initialization
(N
, False);
4264 Set_Expression
(N
, Get_Simple_Init_Val
(Typ
, Loc
, Esize
(Def_Id
)));
4265 Analyze_And_Resolve
(Expression
(N
), Typ
);
4268 -- Generate attribute for Persistent_BSS if needed
4270 if Persistent_BSS_Mode
4271 and then Comes_From_Source
(N
)
4272 and then Is_Potentially_Persistent_Type
(Typ
)
4273 and then not Has_Init_Expression
(N
)
4274 and then Is_Library_Level_Entity
(Def_Id
)
4280 Make_Linker_Section_Pragma
4281 (Def_Id
, Sloc
(N
), ".persistent.bss");
4282 Insert_After
(N
, Prag
);
4287 -- If access type, then we know it is null if not initialized
4289 if Is_Access_Type
(Typ
) then
4290 Set_Is_Known_Null
(Def_Id
);
4293 -- Explicit initialization present
4296 -- Obtain actual expression from qualified expression
4298 if Nkind
(Expr
) = N_Qualified_Expression
then
4299 Expr_Q
:= Expression
(Expr
);
4304 -- When we have the appropriate type of aggregate in the expression
4305 -- (it has been determined during analysis of the aggregate by
4306 -- setting the delay flag), let's perform in place assignment and
4307 -- thus avoid creating a temporary.
4309 if Is_Delayed_Aggregate
(Expr_Q
) then
4310 Convert_Aggr_In_Object_Decl
(N
);
4313 -- Ada 2005 (AI-318-02): If the initialization expression is a
4314 -- call to a build-in-place function, then access to the declared
4315 -- object must be passed to the function. Currently we limit such
4316 -- functions to those with constrained limited result subtypes,
4317 -- but eventually we plan to expand the allowed forms of functions
4318 -- that are treated as build-in-place.
4320 if Ada_Version
>= Ada_05
4321 and then Is_Build_In_Place_Function_Call
(Expr_Q
)
4323 Make_Build_In_Place_Call_In_Object_Declaration
(N
, Expr_Q
);
4327 -- In most cases, we must check that the initial value meets any
4328 -- constraint imposed by the declared type. However, there is one
4329 -- very important exception to this rule. If the entity has an
4330 -- unconstrained nominal subtype, then it acquired its constraints
4331 -- from the expression in the first place, and not only does this
4332 -- mean that the constraint check is not needed, but an attempt to
4333 -- perform the constraint check can cause order order of
4334 -- elaboration problems.
4336 if not Is_Constr_Subt_For_U_Nominal
(Typ
) then
4338 -- If this is an allocator for an aggregate that has been
4339 -- allocated in place, delay checks until assignments are
4340 -- made, because the discriminants are not initialized.
4342 if Nkind
(Expr
) = N_Allocator
4343 and then No_Initialization
(Expr
)
4347 Apply_Constraint_Check
(Expr
, Typ
);
4351 -- Ada 2005 (AI-251): Rewrite the expression that initializes a
4352 -- class-wide object to ensure that we copy the full object,
4353 -- unless we're targetting a VM where interfaces are handled by
4357 -- CW : I'Class := Obj;
4359 -- CW__1 : I'Class := I'Class (Base_Address (Obj'Address));
4360 -- CW : I'Class renames Displace (CW__1, I'Tag);
4362 if Is_Interface
(Typ
)
4363 and then Is_Class_Wide_Type
(Etype
(Expr
))
4364 and then Comes_From_Source
(Def_Id
)
4365 and then VM_Target
= No_VM
4373 Make_Object_Declaration
(Loc
,
4374 Defining_Identifier
=>
4375 Make_Defining_Identifier
(Loc
,
4376 New_Internal_Name
('D')),
4378 Object_Definition
=>
4379 Make_Attribute_Reference
(Loc
,
4382 (Root_Type
(Etype
(Def_Id
)), Loc
),
4383 Attribute_Name
=> Name_Class
),
4386 Unchecked_Convert_To
4387 (Class_Wide_Type
(Root_Type
(Etype
(Def_Id
))),
4388 Make_Explicit_Dereference
(Loc
,
4389 Unchecked_Convert_To
(RTE
(RE_Tag_Ptr
),
4390 Make_Function_Call
(Loc
,
4392 New_Reference_To
(RTE
(RE_Base_Address
),
4394 Parameter_Associations
=> New_List
(
4395 Make_Attribute_Reference
(Loc
,
4396 Prefix
=> Relocate_Node
(Expr
),
4397 Attribute_Name
=> Name_Address
)))))));
4399 Insert_Action
(N
, Decl_1
);
4402 Make_Object_Renaming_Declaration
(Loc
,
4403 Defining_Identifier
=>
4404 Make_Defining_Identifier
(Loc
,
4405 New_Internal_Name
('D')),
4408 Make_Attribute_Reference
(Loc
,
4411 (Root_Type
(Etype
(Def_Id
)), Loc
),
4412 Attribute_Name
=> Name_Class
),
4415 Unchecked_Convert_To
(
4416 Class_Wide_Type
(Root_Type
(Etype
(Def_Id
))),
4417 Make_Explicit_Dereference
(Loc
,
4418 Unchecked_Convert_To
(RTE
(RE_Tag_Ptr
),
4419 Make_Function_Call
(Loc
,
4421 New_Reference_To
(RTE
(RE_Displace
), Loc
),
4423 Parameter_Associations
=> New_List
(
4424 Make_Attribute_Reference
(Loc
,
4427 (Defining_Identifier
(Decl_1
), Loc
),
4428 Attribute_Name
=> Name_Address
),
4430 Unchecked_Convert_To
(RTE
(RE_Tag
),
4435 (Root_Type
(Typ
)))),
4438 Rewrite
(N
, Decl_2
);
4441 -- Replace internal identifier of Decl_2 by the identifier
4442 -- found in the sources. We also have to exchange entities
4443 -- containing their defining identifiers to ensure the
4444 -- correct replacement of the object declaration by this
4445 -- object renaming declaration (because such definings
4446 -- identifier have been previously added by Enter_Name to
4447 -- the current scope). We must preserve the homonym chain
4448 -- of the source entity as well.
4450 Set_Chars
(Defining_Identifier
(N
), Chars
(Def_Id
));
4451 Set_Homonym
(Defining_Identifier
(N
), Homonym
(Def_Id
));
4452 Exchange_Entities
(Defining_Identifier
(N
), Def_Id
);
4458 -- If the type is controlled and not limited then the target is
4459 -- adjusted after the copy and attached to the finalization list.
4460 -- However, no adjustment is done in the case where the object was
4461 -- initialized by a call to a function whose result is built in
4462 -- place, since no copy occurred. (We eventually plan to support
4463 -- in-place function results for some nonlimited types. ???)
4465 if Controlled_Type
(Typ
)
4466 and then not Is_Limited_Type
(Typ
)
4467 and then not BIP_Call
4469 Insert_Actions_After
(Init_After
,
4471 Ref
=> New_Reference_To
(Def_Id
, Loc
),
4472 Typ
=> Base_Type
(Typ
),
4473 Flist_Ref
=> Find_Final_List
(Def_Id
),
4474 With_Attach
=> Make_Integer_Literal
(Loc
, 1)));
4477 -- For tagged types, when an init value is given, the tag has to
4478 -- be re-initialized separately in order to avoid the propagation
4479 -- of a wrong tag coming from a view conversion unless the type
4480 -- is class wide (in this case the tag comes from the init value).
4481 -- Suppress the tag assignment when VM_Target because VM tags are
4482 -- represented implicitly in objects. Ditto for types that are
4483 -- CPP_CLASS, and for initializations that are aggregates, because
4484 -- they have to have the right tag.
4486 if Is_Tagged_Type
(Typ
)
4487 and then not Is_Class_Wide_Type
(Typ
)
4488 and then not Is_CPP_Class
(Typ
)
4489 and then VM_Target
= No_VM
4490 and then Nkind
(Expr
) /= N_Aggregate
4492 -- The re-assignment of the tag has to be done even if the
4493 -- object is a constant.
4496 Make_Selected_Component
(Loc
,
4497 Prefix
=> New_Reference_To
(Def_Id
, Loc
),
4499 New_Reference_To
(First_Tag_Component
(Typ
), Loc
));
4501 Set_Assignment_OK
(New_Ref
);
4503 Insert_After
(Init_After
,
4504 Make_Assignment_Statement
(Loc
,
4507 Unchecked_Convert_To
(RTE
(RE_Tag
),
4511 (Access_Disp_Table
(Base_Type
(Typ
)))),
4514 -- For discrete types, set the Is_Known_Valid flag if the
4515 -- initializing value is known to be valid.
4517 elsif Is_Discrete_Type
(Typ
) and then Expr_Known_Valid
(Expr
) then
4518 Set_Is_Known_Valid
(Def_Id
);
4520 elsif Is_Access_Type
(Typ
) then
4522 -- For access types set the Is_Known_Non_Null flag if the
4523 -- initializing value is known to be non-null. We can also set
4524 -- Can_Never_Be_Null if this is a constant.
4526 if Known_Non_Null
(Expr
) then
4527 Set_Is_Known_Non_Null
(Def_Id
, True);
4529 if Constant_Present
(N
) then
4530 Set_Can_Never_Be_Null
(Def_Id
);
4535 -- If validity checking on copies, validate initial expression.
4536 -- But skip this if declaration is for a generic type, since it
4537 -- makes no sense to validate generic types. Not clear if this
4538 -- can happen for legal programs, but it definitely can arise
4539 -- from previous instantiation errors.
4541 if Validity_Checks_On
4542 and then Validity_Check_Copies
4543 and then not Is_Generic_Type
(Etype
(Def_Id
))
4545 Ensure_Valid
(Expr
);
4546 Set_Is_Known_Valid
(Def_Id
);
4550 -- Cases where the back end cannot handle the initialization directly
4551 -- In such cases, we expand an assignment that will be appropriately
4552 -- handled by Expand_N_Assignment_Statement.
4554 -- The exclusion of the unconstrained case is wrong, but for now it
4555 -- is too much trouble ???
4557 if (Is_Possibly_Unaligned_Slice
(Expr
)
4558 or else (Is_Possibly_Unaligned_Object
(Expr
)
4559 and then not Represented_As_Scalar
(Etype
(Expr
))))
4561 -- The exclusion of the unconstrained case is wrong, but for now
4562 -- it is too much trouble ???
4564 and then not (Is_Array_Type
(Etype
(Expr
))
4565 and then not Is_Constrained
(Etype
(Expr
)))
4568 Stat
: constant Node_Id
:=
4569 Make_Assignment_Statement
(Loc
,
4570 Name
=> New_Reference_To
(Def_Id
, Loc
),
4571 Expression
=> Relocate_Node
(Expr
));
4573 Set_Expression
(N
, Empty
);
4574 Set_No_Initialization
(N
);
4575 Set_Assignment_OK
(Name
(Stat
));
4576 Set_No_Ctrl_Actions
(Stat
);
4577 Insert_After_And_Analyze
(Init_After
, Stat
);
4583 when RE_Not_Available
=>
4585 end Expand_N_Object_Declaration
;
4587 ---------------------------------
4588 -- Expand_N_Subtype_Indication --
4589 ---------------------------------
4591 -- Add a check on the range of the subtype. The static case is partially
4592 -- duplicated by Process_Range_Expr_In_Decl in Sem_Ch3, but we still need
4593 -- to check here for the static case in order to avoid generating
4594 -- extraneous expanded code. Also deal with validity checking.
4596 procedure Expand_N_Subtype_Indication
(N
: Node_Id
) is
4597 Ran
: constant Node_Id
:= Range_Expression
(Constraint
(N
));
4598 Typ
: constant Entity_Id
:= Entity
(Subtype_Mark
(N
));
4601 if Nkind
(Constraint
(N
)) = N_Range_Constraint
then
4602 Validity_Check_Range
(Range_Expression
(Constraint
(N
)));
4605 if Nkind_In
(Parent
(N
), N_Constrained_Array_Definition
, N_Slice
) then
4606 Apply_Range_Check
(Ran
, Typ
);
4608 end Expand_N_Subtype_Indication
;
4610 ---------------------------
4611 -- Expand_N_Variant_Part --
4612 ---------------------------
4614 -- If the last variant does not contain the Others choice, replace it with
4615 -- an N_Others_Choice node since Gigi always wants an Others. Note that we
4616 -- do not bother to call Analyze on the modified variant part, since it's
4617 -- only effect would be to compute the Others_Discrete_Choices node
4618 -- laboriously, and of course we already know the list of choices that
4619 -- corresponds to the others choice (it's the list we are replacing!)
4621 procedure Expand_N_Variant_Part
(N
: Node_Id
) is
4622 Last_Var
: constant Node_Id
:= Last_Non_Pragma
(Variants
(N
));
4623 Others_Node
: Node_Id
;
4625 if Nkind
(First
(Discrete_Choices
(Last_Var
))) /= N_Others_Choice
then
4626 Others_Node
:= Make_Others_Choice
(Sloc
(Last_Var
));
4627 Set_Others_Discrete_Choices
4628 (Others_Node
, Discrete_Choices
(Last_Var
));
4629 Set_Discrete_Choices
(Last_Var
, New_List
(Others_Node
));
4631 end Expand_N_Variant_Part
;
4633 ---------------------------------
4634 -- Expand_Previous_Access_Type --
4635 ---------------------------------
4637 procedure Expand_Previous_Access_Type
(Def_Id
: Entity_Id
) is
4638 T
: Entity_Id
:= First_Entity
(Current_Scope
);
4641 -- Find all access types declared in the current scope, whose
4642 -- designated type is Def_Id. If it does not have a Master_Id,
4645 while Present
(T
) loop
4646 if Is_Access_Type
(T
)
4647 and then Designated_Type
(T
) = Def_Id
4648 and then No
(Master_Id
(T
))
4650 Build_Master_Entity
(Def_Id
);
4651 Build_Master_Renaming
(Parent
(Def_Id
), T
);
4656 end Expand_Previous_Access_Type
;
4658 ------------------------------
4659 -- Expand_Record_Controller --
4660 ------------------------------
4662 procedure Expand_Record_Controller
(T
: Entity_Id
) is
4663 Def
: Node_Id
:= Type_Definition
(Parent
(T
));
4664 Comp_List
: Node_Id
;
4665 Comp_Decl
: Node_Id
;
4667 First_Comp
: Node_Id
;
4668 Controller_Type
: Entity_Id
;
4672 if Nkind
(Def
) = N_Derived_Type_Definition
then
4673 Def
:= Record_Extension_Part
(Def
);
4676 if Null_Present
(Def
) then
4677 Set_Component_List
(Def
,
4678 Make_Component_List
(Sloc
(Def
),
4679 Component_Items
=> Empty_List
,
4680 Variant_Part
=> Empty
,
4681 Null_Present
=> True));
4684 Comp_List
:= Component_List
(Def
);
4686 if Null_Present
(Comp_List
)
4687 or else Is_Empty_List
(Component_Items
(Comp_List
))
4689 Loc
:= Sloc
(Comp_List
);
4691 Loc
:= Sloc
(First
(Component_Items
(Comp_List
)));
4694 if Is_Inherently_Limited_Type
(T
) then
4695 Controller_Type
:= RTE
(RE_Limited_Record_Controller
);
4697 Controller_Type
:= RTE
(RE_Record_Controller
);
4700 Ent
:= Make_Defining_Identifier
(Loc
, Name_uController
);
4703 Make_Component_Declaration
(Loc
,
4704 Defining_Identifier
=> Ent
,
4705 Component_Definition
=>
4706 Make_Component_Definition
(Loc
,
4707 Aliased_Present
=> False,
4708 Subtype_Indication
=> New_Reference_To
(Controller_Type
, Loc
)));
4710 if Null_Present
(Comp_List
)
4711 or else Is_Empty_List
(Component_Items
(Comp_List
))
4713 Set_Component_Items
(Comp_List
, New_List
(Comp_Decl
));
4714 Set_Null_Present
(Comp_List
, False);
4717 -- The controller cannot be placed before the _Parent field since
4718 -- gigi lays out field in order and _parent must be first to preserve
4719 -- the polymorphism of tagged types.
4721 First_Comp
:= First
(Component_Items
(Comp_List
));
4723 if not Is_Tagged_Type
(T
) then
4724 Insert_Before
(First_Comp
, Comp_Decl
);
4726 -- if T is a tagged type, place controller declaration after parent
4727 -- field and after eventual tags of interface types.
4730 while Present
(First_Comp
)
4732 (Chars
(Defining_Identifier
(First_Comp
)) = Name_uParent
4733 or else Is_Tag
(Defining_Identifier
(First_Comp
))
4735 -- Ada 2005 (AI-251): The following condition covers secondary
4736 -- tags but also the adjacent component contanining the offset
4737 -- to the base of the object (component generated if the parent
4738 -- has discriminants --- see Add_Interface_Tag_Components).
4739 -- This is required to avoid the addition of the controller
4740 -- between the secondary tag and its adjacent component.
4744 (Defining_Identifier
(First_Comp
))))
4749 -- An empty tagged extension might consist only of the parent
4750 -- component. Otherwise insert the controller before the first
4751 -- component that is neither parent nor tag.
4753 if Present
(First_Comp
) then
4754 Insert_Before
(First_Comp
, Comp_Decl
);
4756 Append
(Comp_Decl
, Component_Items
(Comp_List
));
4762 Analyze
(Comp_Decl
);
4763 Set_Ekind
(Ent
, E_Component
);
4764 Init_Component_Location
(Ent
);
4766 -- Move the _controller entity ahead in the list of internal entities
4767 -- of the enclosing record so that it is selected instead of a
4768 -- potentially inherited one.
4771 E
: constant Entity_Id
:= Last_Entity
(T
);
4775 pragma Assert
(Chars
(E
) = Name_uController
);
4777 Set_Next_Entity
(E
, First_Entity
(T
));
4778 Set_First_Entity
(T
, E
);
4780 Comp
:= Next_Entity
(E
);
4781 while Next_Entity
(Comp
) /= E
loop
4785 Set_Next_Entity
(Comp
, Empty
);
4786 Set_Last_Entity
(T
, Comp
);
4792 when RE_Not_Available
=>
4794 end Expand_Record_Controller
;
4796 ------------------------
4797 -- Expand_Tagged_Root --
4798 ------------------------
4800 procedure Expand_Tagged_Root
(T
: Entity_Id
) is
4801 Def
: constant Node_Id
:= Type_Definition
(Parent
(T
));
4802 Comp_List
: Node_Id
;
4803 Comp_Decl
: Node_Id
;
4804 Sloc_N
: Source_Ptr
;
4807 if Null_Present
(Def
) then
4808 Set_Component_List
(Def
,
4809 Make_Component_List
(Sloc
(Def
),
4810 Component_Items
=> Empty_List
,
4811 Variant_Part
=> Empty
,
4812 Null_Present
=> True));
4815 Comp_List
:= Component_List
(Def
);
4817 if Null_Present
(Comp_List
)
4818 or else Is_Empty_List
(Component_Items
(Comp_List
))
4820 Sloc_N
:= Sloc
(Comp_List
);
4822 Sloc_N
:= Sloc
(First
(Component_Items
(Comp_List
)));
4826 Make_Component_Declaration
(Sloc_N
,
4827 Defining_Identifier
=> First_Tag_Component
(T
),
4828 Component_Definition
=>
4829 Make_Component_Definition
(Sloc_N
,
4830 Aliased_Present
=> False,
4831 Subtype_Indication
=> New_Reference_To
(RTE
(RE_Tag
), Sloc_N
)));
4833 if Null_Present
(Comp_List
)
4834 or else Is_Empty_List
(Component_Items
(Comp_List
))
4836 Set_Component_Items
(Comp_List
, New_List
(Comp_Decl
));
4837 Set_Null_Present
(Comp_List
, False);
4840 Insert_Before
(First
(Component_Items
(Comp_List
)), Comp_Decl
);
4843 -- We don't Analyze the whole expansion because the tag component has
4844 -- already been analyzed previously. Here we just insure that the tree
4845 -- is coherent with the semantic decoration
4847 Find_Type
(Subtype_Indication
(Component_Definition
(Comp_Decl
)));
4850 when RE_Not_Available
=>
4852 end Expand_Tagged_Root
;
4854 ----------------------
4855 -- Clean_Task_Names --
4856 ----------------------
4858 procedure Clean_Task_Names
4860 Proc_Id
: Entity_Id
)
4864 and then not Restriction_Active
(No_Implicit_Heap_Allocations
)
4865 and then not Global_Discard_Names
4866 and then VM_Target
= No_VM
4868 Set_Uses_Sec_Stack
(Proc_Id
);
4870 end Clean_Task_Names
;
4872 -----------------------
4873 -- Freeze_Array_Type --
4874 -----------------------
4876 procedure Freeze_Array_Type
(N
: Node_Id
) is
4877 Typ
: constant Entity_Id
:= Entity
(N
);
4878 Comp_Typ
: constant Entity_Id
:= Component_Type
(Typ
);
4879 Base
: constant Entity_Id
:= Base_Type
(Typ
);
4882 if not Is_Bit_Packed_Array
(Typ
) then
4884 -- If the component contains tasks, so does the array type. This may
4885 -- not be indicated in the array type because the component may have
4886 -- been a private type at the point of definition. Same if component
4887 -- type is controlled.
4889 Set_Has_Task
(Base
, Has_Task
(Comp_Typ
));
4890 Set_Has_Controlled_Component
(Base
,
4891 Has_Controlled_Component
(Comp_Typ
)
4892 or else Is_Controlled
(Comp_Typ
));
4894 if No
(Init_Proc
(Base
)) then
4896 -- If this is an anonymous array created for a declaration with
4897 -- an initial value, its init_proc will never be called. The
4898 -- initial value itself may have been expanded into assignments,
4899 -- in which case the object declaration is carries the
4900 -- No_Initialization flag.
4903 and then Nkind
(Associated_Node_For_Itype
(Base
)) =
4904 N_Object_Declaration
4905 and then (Present
(Expression
(Associated_Node_For_Itype
(Base
)))
4907 No_Initialization
(Associated_Node_For_Itype
(Base
)))
4911 -- We do not need an init proc for string or wide [wide] string,
4912 -- since the only time these need initialization in normalize or
4913 -- initialize scalars mode, and these types are treated specially
4914 -- and do not need initialization procedures.
4916 elsif Root_Type
(Base
) = Standard_String
4917 or else Root_Type
(Base
) = Standard_Wide_String
4918 or else Root_Type
(Base
) = Standard_Wide_Wide_String
4922 -- Otherwise we have to build an init proc for the subtype
4925 Build_Array_Init_Proc
(Base
, N
);
4930 if Has_Controlled_Component
(Base
) then
4931 Build_Controlling_Procs
(Base
);
4933 if not Is_Limited_Type
(Comp_Typ
)
4934 and then Number_Dimensions
(Typ
) = 1
4936 Build_Slice_Assignment
(Typ
);
4939 elsif Ekind
(Comp_Typ
) = E_Anonymous_Access_Type
4940 and then Controlled_Type
(Directly_Designated_Type
(Comp_Typ
))
4942 Set_Associated_Final_Chain
(Comp_Typ
, Add_Final_Chain
(Typ
));
4946 -- For packed case, default initialization, except if the component type
4947 -- is itself a packed structure with an initialization procedure, or
4948 -- initialize/normalize scalars active, and we have a base type, or the
4949 -- type is public, because in that case a client might specify
4950 -- Normalize_Scalars and there better be a public Init_Proc for it.
4952 elsif (Present
(Init_Proc
(Component_Type
(Base
)))
4953 and then No
(Base_Init_Proc
(Base
)))
4954 or else (Init_Or_Norm_Scalars
and then Base
= Typ
)
4955 or else Is_Public
(Typ
)
4957 Build_Array_Init_Proc
(Base
, N
);
4959 end Freeze_Array_Type
;
4961 -----------------------------
4962 -- Freeze_Enumeration_Type --
4963 -----------------------------
4965 procedure Freeze_Enumeration_Type
(N
: Node_Id
) is
4966 Typ
: constant Entity_Id
:= Entity
(N
);
4967 Loc
: constant Source_Ptr
:= Sloc
(Typ
);
4974 Is_Contiguous
: Boolean;
4979 pragma Warnings
(Off
, Func
);
4982 -- Various optimizations possible if given representation is contiguous
4984 Is_Contiguous
:= True;
4986 Ent
:= First_Literal
(Typ
);
4987 Last_Repval
:= Enumeration_Rep
(Ent
);
4990 while Present
(Ent
) loop
4991 if Enumeration_Rep
(Ent
) - Last_Repval
/= 1 then
4992 Is_Contiguous
:= False;
4995 Last_Repval
:= Enumeration_Rep
(Ent
);
5001 if Is_Contiguous
then
5002 Set_Has_Contiguous_Rep
(Typ
);
5003 Ent
:= First_Literal
(Typ
);
5005 Lst
:= New_List
(New_Reference_To
(Ent
, Sloc
(Ent
)));
5008 -- Build list of literal references
5013 Ent
:= First_Literal
(Typ
);
5014 while Present
(Ent
) loop
5015 Append_To
(Lst
, New_Reference_To
(Ent
, Sloc
(Ent
)));
5021 -- Now build an array declaration
5023 -- typA : array (Natural range 0 .. num - 1) of ctype :=
5024 -- (v, v, v, v, v, ....)
5026 -- where ctype is the corresponding integer type. If the representation
5027 -- is contiguous, we only keep the first literal, which provides the
5028 -- offset for Pos_To_Rep computations.
5031 Make_Defining_Identifier
(Loc
,
5032 Chars
=> New_External_Name
(Chars
(Typ
), 'A'));
5034 Append_Freeze_Action
(Typ
,
5035 Make_Object_Declaration
(Loc
,
5036 Defining_Identifier
=> Arr
,
5037 Constant_Present
=> True,
5039 Object_Definition
=>
5040 Make_Constrained_Array_Definition
(Loc
,
5041 Discrete_Subtype_Definitions
=> New_List
(
5042 Make_Subtype_Indication
(Loc
,
5043 Subtype_Mark
=> New_Reference_To
(Standard_Natural
, Loc
),
5045 Make_Range_Constraint
(Loc
,
5049 Make_Integer_Literal
(Loc
, 0),
5051 Make_Integer_Literal
(Loc
, Num
- 1))))),
5053 Component_Definition
=>
5054 Make_Component_Definition
(Loc
,
5055 Aliased_Present
=> False,
5056 Subtype_Indication
=> New_Reference_To
(Typ
, Loc
))),
5059 Make_Aggregate
(Loc
,
5060 Expressions
=> Lst
)));
5062 Set_Enum_Pos_To_Rep
(Typ
, Arr
);
5064 -- Now we build the function that converts representation values to
5065 -- position values. This function has the form:
5067 -- function _Rep_To_Pos (A : etype; F : Boolean) return Integer is
5070 -- when enum-lit'Enum_Rep => return posval;
5071 -- when enum-lit'Enum_Rep => return posval;
5074 -- [raise Constraint_Error when F "invalid data"]
5079 -- Note: the F parameter determines whether the others case (no valid
5080 -- representation) raises Constraint_Error or returns a unique value
5081 -- of minus one. The latter case is used, e.g. in 'Valid code.
5083 -- Note: the reason we use Enum_Rep values in the case here is to avoid
5084 -- the code generator making inappropriate assumptions about the range
5085 -- of the values in the case where the value is invalid. ityp is a
5086 -- signed or unsigned integer type of appropriate width.
5088 -- Note: if exceptions are not supported, then we suppress the raise
5089 -- and return -1 unconditionally (this is an erroneous program in any
5090 -- case and there is no obligation to raise Constraint_Error here!) We
5091 -- also do this if pragma Restrictions (No_Exceptions) is active.
5093 -- Is this right??? What about No_Exception_Propagation???
5095 -- Representations are signed
5097 if Enumeration_Rep
(First_Literal
(Typ
)) < 0 then
5099 -- The underlying type is signed. Reset the Is_Unsigned_Type
5100 -- explicitly, because it might have been inherited from
5103 Set_Is_Unsigned_Type
(Typ
, False);
5105 if Esize
(Typ
) <= Standard_Integer_Size
then
5106 Ityp
:= Standard_Integer
;
5108 Ityp
:= Universal_Integer
;
5111 -- Representations are unsigned
5114 if Esize
(Typ
) <= Standard_Integer_Size
then
5115 Ityp
:= RTE
(RE_Unsigned
);
5117 Ityp
:= RTE
(RE_Long_Long_Unsigned
);
5121 -- The body of the function is a case statement. First collect case
5122 -- alternatives, or optimize the contiguous case.
5126 -- If representation is contiguous, Pos is computed by subtracting
5127 -- the representation of the first literal.
5129 if Is_Contiguous
then
5130 Ent
:= First_Literal
(Typ
);
5132 if Enumeration_Rep
(Ent
) = Last_Repval
then
5134 -- Another special case: for a single literal, Pos is zero
5136 Pos_Expr
:= Make_Integer_Literal
(Loc
, Uint_0
);
5140 Convert_To
(Standard_Integer
,
5141 Make_Op_Subtract
(Loc
,
5143 Unchecked_Convert_To
(Ityp
,
5144 Make_Identifier
(Loc
, Name_uA
)),
5146 Make_Integer_Literal
(Loc
,
5148 Enumeration_Rep
(First_Literal
(Typ
)))));
5152 Make_Case_Statement_Alternative
(Loc
,
5153 Discrete_Choices
=> New_List
(
5154 Make_Range
(Sloc
(Enumeration_Rep_Expr
(Ent
)),
5156 Make_Integer_Literal
(Loc
,
5157 Intval
=> Enumeration_Rep
(Ent
)),
5159 Make_Integer_Literal
(Loc
, Intval
=> Last_Repval
))),
5161 Statements
=> New_List
(
5162 Make_Simple_Return_Statement
(Loc
,
5163 Expression
=> Pos_Expr
))));
5166 Ent
:= First_Literal
(Typ
);
5167 while Present
(Ent
) loop
5169 Make_Case_Statement_Alternative
(Loc
,
5170 Discrete_Choices
=> New_List
(
5171 Make_Integer_Literal
(Sloc
(Enumeration_Rep_Expr
(Ent
)),
5172 Intval
=> Enumeration_Rep
(Ent
))),
5174 Statements
=> New_List
(
5175 Make_Simple_Return_Statement
(Loc
,
5177 Make_Integer_Literal
(Loc
,
5178 Intval
=> Enumeration_Pos
(Ent
))))));
5184 -- In normal mode, add the others clause with the test
5186 if not No_Exception_Handlers_Set
then
5188 Make_Case_Statement_Alternative
(Loc
,
5189 Discrete_Choices
=> New_List
(Make_Others_Choice
(Loc
)),
5190 Statements
=> New_List
(
5191 Make_Raise_Constraint_Error
(Loc
,
5192 Condition
=> Make_Identifier
(Loc
, Name_uF
),
5193 Reason
=> CE_Invalid_Data
),
5194 Make_Simple_Return_Statement
(Loc
,
5196 Make_Integer_Literal
(Loc
, -1)))));
5198 -- If either of the restrictions No_Exceptions_Handlers/Propagation is
5199 -- active then return -1 (we cannot usefully raise Constraint_Error in
5200 -- this case). See description above for further details.
5204 Make_Case_Statement_Alternative
(Loc
,
5205 Discrete_Choices
=> New_List
(Make_Others_Choice
(Loc
)),
5206 Statements
=> New_List
(
5207 Make_Simple_Return_Statement
(Loc
,
5209 Make_Integer_Literal
(Loc
, -1)))));
5212 -- Now we can build the function body
5215 Make_Defining_Identifier
(Loc
, Make_TSS_Name
(Typ
, TSS_Rep_To_Pos
));
5218 Make_Subprogram_Body
(Loc
,
5220 Make_Function_Specification
(Loc
,
5221 Defining_Unit_Name
=> Fent
,
5222 Parameter_Specifications
=> New_List
(
5223 Make_Parameter_Specification
(Loc
,
5224 Defining_Identifier
=>
5225 Make_Defining_Identifier
(Loc
, Name_uA
),
5226 Parameter_Type
=> New_Reference_To
(Typ
, Loc
)),
5227 Make_Parameter_Specification
(Loc
,
5228 Defining_Identifier
=>
5229 Make_Defining_Identifier
(Loc
, Name_uF
),
5230 Parameter_Type
=> New_Reference_To
(Standard_Boolean
, Loc
))),
5232 Result_Definition
=> New_Reference_To
(Standard_Integer
, Loc
)),
5234 Declarations
=> Empty_List
,
5236 Handled_Statement_Sequence
=>
5237 Make_Handled_Sequence_Of_Statements
(Loc
,
5238 Statements
=> New_List
(
5239 Make_Case_Statement
(Loc
,
5241 Unchecked_Convert_To
(Ityp
,
5242 Make_Identifier
(Loc
, Name_uA
)),
5243 Alternatives
=> Lst
))));
5245 Set_TSS
(Typ
, Fent
);
5248 if not Debug_Generated_Code
then
5249 Set_Debug_Info_Off
(Fent
);
5253 when RE_Not_Available
=>
5255 end Freeze_Enumeration_Type
;
5257 ------------------------
5258 -- Freeze_Record_Type --
5259 ------------------------
5261 procedure Freeze_Record_Type
(N
: Node_Id
) is
5262 Def_Id
: constant Node_Id
:= Entity
(N
);
5263 Type_Decl
: constant Node_Id
:= Parent
(Def_Id
);
5265 Comp_Typ
: Entity_Id
;
5266 Has_Static_DT
: Boolean := False;
5267 Predef_List
: List_Id
;
5269 Flist
: Entity_Id
:= Empty
;
5270 -- Finalization list allocated for the case of a type with anonymous
5271 -- access components whose designated type is potentially controlled.
5273 Renamed_Eq
: Node_Id
:= Empty
;
5274 -- Defining unit name for the predefined equality function in the case
5275 -- where the type has a primitive operation that is a renaming of
5276 -- predefined equality (but only if there is also an overriding
5277 -- user-defined equality function). Used to pass this entity from
5278 -- Make_Predefined_Primitive_Specs to Predefined_Primitive_Bodies.
5280 Wrapper_Decl_List
: List_Id
:= No_List
;
5281 Wrapper_Body_List
: List_Id
:= No_List
;
5282 Null_Proc_Decl_List
: List_Id
:= No_List
;
5285 -- Build discriminant checking functions if not a derived type (for
5286 -- derived types that are not tagged types, always use the discriminant
5287 -- checking functions of the parent type). However, for untagged types
5288 -- the derivation may have taken place before the parent was frozen, so
5289 -- we copy explicitly the discriminant checking functions from the
5290 -- parent into the components of the derived type.
5292 if not Is_Derived_Type
(Def_Id
)
5293 or else Has_New_Non_Standard_Rep
(Def_Id
)
5294 or else Is_Tagged_Type
(Def_Id
)
5296 Build_Discr_Checking_Funcs
(Type_Decl
);
5298 elsif Is_Derived_Type
(Def_Id
)
5299 and then not Is_Tagged_Type
(Def_Id
)
5301 -- If we have a derived Unchecked_Union, we do not inherit the
5302 -- discriminant checking functions from the parent type since the
5303 -- discriminants are non existent.
5305 and then not Is_Unchecked_Union
(Def_Id
)
5306 and then Has_Discriminants
(Def_Id
)
5309 Old_Comp
: Entity_Id
;
5313 First_Component
(Base_Type
(Underlying_Type
(Etype
(Def_Id
))));
5314 Comp
:= First_Component
(Def_Id
);
5315 while Present
(Comp
) loop
5316 if Ekind
(Comp
) = E_Component
5317 and then Chars
(Comp
) = Chars
(Old_Comp
)
5319 Set_Discriminant_Checking_Func
(Comp
,
5320 Discriminant_Checking_Func
(Old_Comp
));
5323 Next_Component
(Old_Comp
);
5324 Next_Component
(Comp
);
5329 if Is_Derived_Type
(Def_Id
)
5330 and then Is_Limited_Type
(Def_Id
)
5331 and then Is_Tagged_Type
(Def_Id
)
5333 Check_Stream_Attributes
(Def_Id
);
5336 -- Update task and controlled component flags, because some of the
5337 -- component types may have been private at the point of the record
5340 Comp
:= First_Component
(Def_Id
);
5342 while Present
(Comp
) loop
5343 Comp_Typ
:= Etype
(Comp
);
5345 if Has_Task
(Comp_Typ
) then
5346 Set_Has_Task
(Def_Id
);
5348 elsif Has_Controlled_Component
(Comp_Typ
)
5349 or else (Chars
(Comp
) /= Name_uParent
5350 and then Is_Controlled
(Comp_Typ
))
5352 Set_Has_Controlled_Component
(Def_Id
);
5354 elsif Ekind
(Comp_Typ
) = E_Anonymous_Access_Type
5355 and then Controlled_Type
(Directly_Designated_Type
(Comp_Typ
))
5358 Flist
:= Add_Final_Chain
(Def_Id
);
5361 Set_Associated_Final_Chain
(Comp_Typ
, Flist
);
5364 Next_Component
(Comp
);
5367 -- Creation of the Dispatch Table. Note that a Dispatch Table is built
5368 -- for regular tagged types as well as for Ada types deriving from a C++
5369 -- Class, but not for tagged types directly corresponding to C++ classes
5370 -- In the later case we assume that it is created in the C++ side and we
5373 if Is_Tagged_Type
(Def_Id
) then
5375 Static_Dispatch_Tables
5376 and then Is_Library_Level_Tagged_Type
(Def_Id
);
5378 -- Add the _Tag component
5380 if Underlying_Type
(Etype
(Def_Id
)) = Def_Id
then
5381 Expand_Tagged_Root
(Def_Id
);
5384 if Is_CPP_Class
(Def_Id
) then
5385 Set_All_DT_Position
(Def_Id
);
5386 Set_Default_Constructor
(Def_Id
);
5388 -- Create the tag entities with a minimum decoration
5390 if VM_Target
= No_VM
then
5391 Append_Freeze_Actions
(Def_Id
, Make_Tags
(Def_Id
));
5395 if not Has_Static_DT
then
5397 -- Usually inherited primitives are not delayed but the first
5398 -- Ada extension of a CPP_Class is an exception since the
5399 -- address of the inherited subprogram has to be inserted in
5400 -- the new Ada Dispatch Table and this is a freezing action.
5402 -- Similarly, if this is an inherited operation whose parent is
5403 -- not frozen yet, it is not in the DT of the parent, and we
5404 -- generate an explicit freeze node for the inherited operation
5405 -- so that it is properly inserted in the DT of the current
5409 Elmt
: Elmt_Id
:= First_Elmt
(Primitive_Operations
(Def_Id
));
5413 while Present
(Elmt
) loop
5414 Subp
:= Node
(Elmt
);
5416 if Present
(Alias
(Subp
)) then
5417 if Is_CPP_Class
(Etype
(Def_Id
)) then
5418 Set_Has_Delayed_Freeze
(Subp
);
5420 elsif Has_Delayed_Freeze
(Alias
(Subp
))
5421 and then not Is_Frozen
(Alias
(Subp
))
5423 Set_Is_Frozen
(Subp
, False);
5424 Set_Has_Delayed_Freeze
(Subp
);
5433 -- Unfreeze momentarily the type to add the predefined primitives
5434 -- operations. The reason we unfreeze is so that these predefined
5435 -- operations will indeed end up as primitive operations (which
5436 -- must be before the freeze point).
5438 Set_Is_Frozen
(Def_Id
, False);
5440 -- Do not add the spec of the predefined primitives if we are
5441 -- compiling under restriction No_Dispatching_Calls
5443 if not Restriction_Active
(No_Dispatching_Calls
) then
5444 Make_Predefined_Primitive_Specs
5445 (Def_Id
, Predef_List
, Renamed_Eq
);
5446 Insert_List_Before_And_Analyze
(N
, Predef_List
);
5449 -- Ada 2005 (AI-391): For a nonabstract null extension, create
5450 -- wrapper functions for each nonoverridden inherited function
5451 -- with a controlling result of the type. The wrapper for such
5452 -- a function returns an extension aggregate that invokes the
5453 -- the parent function.
5455 if Ada_Version
>= Ada_05
5456 and then not Is_Abstract_Type
(Def_Id
)
5457 and then Is_Null_Extension
(Def_Id
)
5459 Make_Controlling_Function_Wrappers
5460 (Def_Id
, Wrapper_Decl_List
, Wrapper_Body_List
);
5461 Insert_List_Before_And_Analyze
(N
, Wrapper_Decl_List
);
5464 -- Ada 2005 (AI-251): For a nonabstract type extension, build
5465 -- null procedure declarations for each set of homographic null
5466 -- procedures that are inherited from interface types but not
5467 -- overridden. This is done to ensure that the dispatch table
5468 -- entry associated with such null primitives are properly filled.
5470 if Ada_Version
>= Ada_05
5471 and then Etype
(Def_Id
) /= Def_Id
5472 and then not Is_Abstract_Type
(Def_Id
)
5474 Make_Null_Procedure_Specs
(Def_Id
, Null_Proc_Decl_List
);
5475 Insert_Actions
(N
, Null_Proc_Decl_List
);
5478 Set_Is_Frozen
(Def_Id
);
5479 Set_All_DT_Position
(Def_Id
);
5481 -- Add the controlled component before the freezing actions
5482 -- referenced in those actions.
5484 if Has_New_Controlled_Component
(Def_Id
) then
5485 Expand_Record_Controller
(Def_Id
);
5488 -- Create and decorate the tags. Suppress their creation when
5489 -- VM_Target because the dispatching mechanism is handled
5490 -- internally by the VMs.
5492 if VM_Target
= No_VM
then
5493 Append_Freeze_Actions
(Def_Id
, Make_Tags
(Def_Id
));
5495 -- Generate dispatch table of locally defined tagged type.
5496 -- Dispatch tables of library level tagged types are built
5497 -- later (see Analyze_Declarations).
5499 if VM_Target
= No_VM
5500 and then not Has_Static_DT
5502 Append_Freeze_Actions
(Def_Id
, Make_DT
(Def_Id
));
5506 -- Make sure that the primitives Initialize, Adjust and Finalize
5507 -- are Frozen before other TSS subprograms. We don't want them
5510 if Is_Controlled
(Def_Id
) then
5511 if not Is_Limited_Type
(Def_Id
) then
5512 Append_Freeze_Actions
(Def_Id
,
5514 (Find_Prim_Op
(Def_Id
, Name_Adjust
), Sloc
(Def_Id
)));
5517 Append_Freeze_Actions
(Def_Id
,
5519 (Find_Prim_Op
(Def_Id
, Name_Initialize
), Sloc
(Def_Id
)));
5521 Append_Freeze_Actions
(Def_Id
,
5523 (Find_Prim_Op
(Def_Id
, Name_Finalize
), Sloc
(Def_Id
)));
5526 -- Freeze rest of primitive operations. There is no need to handle
5527 -- the predefined primitives if we are compiling under restriction
5528 -- No_Dispatching_Calls
5530 if not Restriction_Active
(No_Dispatching_Calls
) then
5531 Append_Freeze_Actions
5532 (Def_Id
, Predefined_Primitive_Freeze
(Def_Id
));
5536 -- In the non-tagged case, an equality function is provided only for
5537 -- variant records (that are not unchecked unions).
5539 elsif Has_Discriminants
(Def_Id
)
5540 and then not Is_Limited_Type
(Def_Id
)
5543 Comps
: constant Node_Id
:=
5544 Component_List
(Type_Definition
(Type_Decl
));
5548 and then Present
(Variant_Part
(Comps
))
5550 Build_Variant_Record_Equality
(Def_Id
);
5555 -- Before building the record initialization procedure, if we are
5556 -- dealing with a concurrent record value type, then we must go through
5557 -- the discriminants, exchanging discriminals between the concurrent
5558 -- type and the concurrent record value type. See the section "Handling
5559 -- of Discriminants" in the Einfo spec for details.
5561 if Is_Concurrent_Record_Type
(Def_Id
)
5562 and then Has_Discriminants
(Def_Id
)
5565 Ctyp
: constant Entity_Id
:=
5566 Corresponding_Concurrent_Type
(Def_Id
);
5567 Conc_Discr
: Entity_Id
;
5568 Rec_Discr
: Entity_Id
;
5572 Conc_Discr
:= First_Discriminant
(Ctyp
);
5573 Rec_Discr
:= First_Discriminant
(Def_Id
);
5575 while Present
(Conc_Discr
) loop
5576 Temp
:= Discriminal
(Conc_Discr
);
5577 Set_Discriminal
(Conc_Discr
, Discriminal
(Rec_Discr
));
5578 Set_Discriminal
(Rec_Discr
, Temp
);
5580 Set_Discriminal_Link
(Discriminal
(Conc_Discr
), Conc_Discr
);
5581 Set_Discriminal_Link
(Discriminal
(Rec_Discr
), Rec_Discr
);
5583 Next_Discriminant
(Conc_Discr
);
5584 Next_Discriminant
(Rec_Discr
);
5589 if Has_Controlled_Component
(Def_Id
) then
5590 if No
(Controller_Component
(Def_Id
)) then
5591 Expand_Record_Controller
(Def_Id
);
5594 Build_Controlling_Procs
(Def_Id
);
5597 Adjust_Discriminants
(Def_Id
);
5599 if VM_Target
= No_VM
or else not Is_Interface
(Def_Id
) then
5601 -- Do not need init for interfaces on e.g. CIL since they're
5602 -- abstract. Helps operation of peverify (the PE Verify tool).
5604 Build_Record_Init_Proc
(Type_Decl
, Def_Id
);
5607 -- For tagged type that are not interfaces, build bodies of primitive
5608 -- operations. Note that we do this after building the record
5609 -- initialization procedure, since the primitive operations may need
5610 -- the initialization routine. There is no need to add predefined
5611 -- primitives of interfaces because all their predefined primitives
5614 if Is_Tagged_Type
(Def_Id
)
5615 and then not Is_Interface
(Def_Id
)
5618 -- Do not add the body of the predefined primitives if we are
5619 -- compiling under restriction No_Dispatching_Calls
5621 if not Restriction_Active
(No_Dispatching_Calls
) then
5622 Predef_List
:= Predefined_Primitive_Bodies
(Def_Id
, Renamed_Eq
);
5623 Append_Freeze_Actions
(Def_Id
, Predef_List
);
5626 -- Ada 2005 (AI-391): If any wrappers were created for nonoverridden
5627 -- inherited functions, then add their bodies to the freeze actions.
5629 if Present
(Wrapper_Body_List
) then
5630 Append_Freeze_Actions
(Def_Id
, Wrapper_Body_List
);
5633 end Freeze_Record_Type
;
5635 ------------------------------
5636 -- Freeze_Stream_Operations --
5637 ------------------------------
5639 procedure Freeze_Stream_Operations
(N
: Node_Id
; Typ
: Entity_Id
) is
5640 Names
: constant array (1 .. 4) of TSS_Name_Type
:=
5645 Stream_Op
: Entity_Id
;
5648 -- Primitive operations of tagged types are frozen when the dispatch
5649 -- table is constructed.
5651 if not Comes_From_Source
(Typ
)
5652 or else Is_Tagged_Type
(Typ
)
5657 for J
in Names
'Range loop
5658 Stream_Op
:= TSS
(Typ
, Names
(J
));
5660 if Present
(Stream_Op
)
5661 and then Is_Subprogram
(Stream_Op
)
5662 and then Nkind
(Unit_Declaration_Node
(Stream_Op
)) =
5663 N_Subprogram_Declaration
5664 and then not Is_Frozen
(Stream_Op
)
5666 Append_Freeze_Actions
5667 (Typ
, Freeze_Entity
(Stream_Op
, Sloc
(N
)));
5670 end Freeze_Stream_Operations
;
5676 -- Full type declarations are expanded at the point at which the type is
5677 -- frozen. The formal N is the Freeze_Node for the type. Any statements or
5678 -- declarations generated by the freezing (e.g. the procedure generated
5679 -- for initialization) are chained in the Actions field list of the freeze
5680 -- node using Append_Freeze_Actions.
5682 function Freeze_Type
(N
: Node_Id
) return Boolean is
5683 Def_Id
: constant Entity_Id
:= Entity
(N
);
5684 RACW_Seen
: Boolean := False;
5685 Result
: Boolean := False;
5688 -- Process associated access types needing special processing
5690 if Present
(Access_Types_To_Process
(N
)) then
5692 E
: Elmt_Id
:= First_Elmt
(Access_Types_To_Process
(N
));
5694 while Present
(E
) loop
5696 if Is_Remote_Access_To_Class_Wide_Type
(Node
(E
)) then
5697 Validate_RACW_Primitives
(Node
(E
));
5707 -- If there are RACWs designating this type, make stubs now
5709 Remote_Types_Tagged_Full_View_Encountered
(Def_Id
);
5713 -- Freeze processing for record types
5715 if Is_Record_Type
(Def_Id
) then
5716 if Ekind
(Def_Id
) = E_Record_Type
then
5717 Freeze_Record_Type
(N
);
5719 -- The subtype may have been declared before the type was frozen. If
5720 -- the type has controlled components it is necessary to create the
5721 -- entity for the controller explicitly because it did not exist at
5722 -- the point of the subtype declaration. Only the entity is needed,
5723 -- the back-end will obtain the layout from the type. This is only
5724 -- necessary if this is constrained subtype whose component list is
5725 -- not shared with the base type.
5727 elsif Ekind
(Def_Id
) = E_Record_Subtype
5728 and then Has_Discriminants
(Def_Id
)
5729 and then Last_Entity
(Def_Id
) /= Last_Entity
(Base_Type
(Def_Id
))
5730 and then Present
(Controller_Component
(Def_Id
))
5733 Old_C
: constant Entity_Id
:= Controller_Component
(Def_Id
);
5737 if Scope
(Old_C
) = Base_Type
(Def_Id
) then
5739 -- The entity is the one in the parent. Create new one
5741 New_C
:= New_Copy
(Old_C
);
5742 Set_Parent
(New_C
, Parent
(Old_C
));
5743 Push_Scope
(Def_Id
);
5749 if Is_Itype
(Def_Id
)
5750 and then Is_Record_Type
(Underlying_Type
(Scope
(Def_Id
)))
5752 -- The freeze node is only used to introduce the controller,
5753 -- the back-end has no use for it for a discriminated
5756 Set_Freeze_Node
(Def_Id
, Empty
);
5757 Set_Has_Delayed_Freeze
(Def_Id
, False);
5761 -- Similar process if the controller of the subtype is not present
5762 -- but the parent has it. This can happen with constrained
5763 -- record components where the subtype is an itype.
5765 elsif Ekind
(Def_Id
) = E_Record_Subtype
5766 and then Is_Itype
(Def_Id
)
5767 and then No
(Controller_Component
(Def_Id
))
5768 and then Present
(Controller_Component
(Etype
(Def_Id
)))
5771 Old_C
: constant Entity_Id
:=
5772 Controller_Component
(Etype
(Def_Id
));
5773 New_C
: constant Entity_Id
:= New_Copy
(Old_C
);
5776 Set_Next_Entity
(New_C
, First_Entity
(Def_Id
));
5777 Set_First_Entity
(Def_Id
, New_C
);
5779 -- The freeze node is only used to introduce the controller,
5780 -- the back-end has no use for it for a discriminated
5783 Set_Freeze_Node
(Def_Id
, Empty
);
5784 Set_Has_Delayed_Freeze
(Def_Id
, False);
5789 -- Freeze processing for array types
5791 elsif Is_Array_Type
(Def_Id
) then
5792 Freeze_Array_Type
(N
);
5794 -- Freeze processing for access types
5796 -- For pool-specific access types, find out the pool object used for
5797 -- this type, needs actual expansion of it in some cases. Here are the
5798 -- different cases :
5800 -- 1. Rep Clause "for Def_Id'Storage_Size use 0;"
5801 -- ---> don't use any storage pool
5803 -- 2. Rep Clause : for Def_Id'Storage_Size use Expr.
5805 -- Def_Id__Pool : Stack_Bounded_Pool (Expr, DT'Size, DT'Alignment);
5807 -- 3. Rep Clause "for Def_Id'Storage_Pool use a_Pool_Object"
5808 -- ---> Storage Pool is the specified one
5810 -- See GNAT Pool packages in the Run-Time for more details
5812 elsif Ekind
(Def_Id
) = E_Access_Type
5813 or else Ekind
(Def_Id
) = E_General_Access_Type
5816 Loc
: constant Source_Ptr
:= Sloc
(N
);
5817 Desig_Type
: constant Entity_Id
:= Designated_Type
(Def_Id
);
5818 Pool_Object
: Entity_Id
;
5821 Freeze_Action_Typ
: Entity_Id
;
5824 if Has_Storage_Size_Clause
(Def_Id
) then
5825 Siz_Exp
:= Expression
(Parent
(Storage_Size_Variable
(Def_Id
)));
5832 -- Rep Clause "for Def_Id'Storage_Size use 0;"
5833 -- ---> don't use any storage pool
5835 if Has_Storage_Size_Clause
(Def_Id
)
5836 and then Compile_Time_Known_Value
(Siz_Exp
)
5837 and then Expr_Value
(Siz_Exp
) = 0
5843 -- Rep Clause : for Def_Id'Storage_Size use Expr.
5845 -- Def_Id__Pool : Stack_Bounded_Pool
5846 -- (Expr, DT'Size, DT'Alignment);
5848 elsif Has_Storage_Size_Clause
(Def_Id
) then
5854 -- For unconstrained composite types we give a size of zero
5855 -- so that the pool knows that it needs a special algorithm
5856 -- for variable size object allocation.
5858 if Is_Composite_Type
(Desig_Type
)
5859 and then not Is_Constrained
(Desig_Type
)
5862 Make_Integer_Literal
(Loc
, 0);
5865 Make_Integer_Literal
(Loc
, Maximum_Alignment
);
5869 Make_Attribute_Reference
(Loc
,
5870 Prefix
=> New_Reference_To
(Desig_Type
, Loc
),
5871 Attribute_Name
=> Name_Max_Size_In_Storage_Elements
);
5874 Make_Attribute_Reference
(Loc
,
5875 Prefix
=> New_Reference_To
(Desig_Type
, Loc
),
5876 Attribute_Name
=> Name_Alignment
);
5880 Make_Defining_Identifier
(Loc
,
5881 Chars
=> New_External_Name
(Chars
(Def_Id
), 'P'));
5883 -- We put the code associated with the pools in the entity
5884 -- that has the later freeze node, usually the access type
5885 -- but it can also be the designated_type; because the pool
5886 -- code requires both those types to be frozen
5888 if Is_Frozen
(Desig_Type
)
5889 and then (No
(Freeze_Node
(Desig_Type
))
5890 or else Analyzed
(Freeze_Node
(Desig_Type
)))
5892 Freeze_Action_Typ
:= Def_Id
;
5894 -- A Taft amendment type cannot get the freeze actions
5895 -- since the full view is not there.
5897 elsif Is_Incomplete_Or_Private_Type
(Desig_Type
)
5898 and then No
(Full_View
(Desig_Type
))
5900 Freeze_Action_Typ
:= Def_Id
;
5903 Freeze_Action_Typ
:= Desig_Type
;
5906 Append_Freeze_Action
(Freeze_Action_Typ
,
5907 Make_Object_Declaration
(Loc
,
5908 Defining_Identifier
=> Pool_Object
,
5909 Object_Definition
=>
5910 Make_Subtype_Indication
(Loc
,
5913 (RTE
(RE_Stack_Bounded_Pool
), Loc
),
5916 Make_Index_Or_Discriminant_Constraint
(Loc
,
5917 Constraints
=> New_List
(
5919 -- First discriminant is the Pool Size
5922 Storage_Size_Variable
(Def_Id
), Loc
),
5924 -- Second discriminant is the element size
5928 -- Third discriminant is the alignment
5933 Set_Associated_Storage_Pool
(Def_Id
, Pool_Object
);
5937 -- Rep Clause "for Def_Id'Storage_Pool use a_Pool_Object"
5938 -- ---> Storage Pool is the specified one
5940 elsif Present
(Associated_Storage_Pool
(Def_Id
)) then
5942 -- Nothing to do the associated storage pool has been attached
5943 -- when analyzing the rep. clause
5948 -- For access-to-controlled types (including class-wide types and
5949 -- Taft-amendment types which potentially have controlled
5950 -- components), expand the list controller object that will store
5951 -- the dynamically allocated objects. Do not do this
5952 -- transformation for expander-generated access types, but do it
5953 -- for types that are the full view of types derived from other
5954 -- private types. Also suppress the list controller in the case
5955 -- of a designated type with convention Java, since this is used
5956 -- when binding to Java API specs, where there's no equivalent of
5957 -- a finalization list and we don't want to pull in the
5958 -- finalization support if not needed.
5960 if not Comes_From_Source
(Def_Id
)
5961 and then not Has_Private_Declaration
(Def_Id
)
5965 elsif (Controlled_Type
(Desig_Type
)
5966 and then Convention
(Desig_Type
) /= Convention_Java
5967 and then Convention
(Desig_Type
) /= Convention_CIL
)
5969 (Is_Incomplete_Or_Private_Type
(Desig_Type
)
5970 and then No
(Full_View
(Desig_Type
))
5972 -- An exception is made for types defined in the run-time
5973 -- because Ada.Tags.Tag itself is such a type and cannot
5974 -- afford this unnecessary overhead that would generates a
5975 -- loop in the expansion scheme...
5977 and then not In_Runtime
(Def_Id
)
5979 -- Another exception is if Restrictions (No_Finalization)
5980 -- is active, since then we know nothing is controlled.
5982 and then not Restriction_Active
(No_Finalization
))
5984 -- If the designated type is not frozen yet, its controlled
5985 -- status must be retrieved explicitly.
5987 or else (Is_Array_Type
(Desig_Type
)
5988 and then not Is_Frozen
(Desig_Type
)
5989 and then Controlled_Type
(Component_Type
(Desig_Type
)))
5991 -- The designated type has controlled anonymous access
5994 or else Has_Controlled_Coextensions
(Desig_Type
)
5996 Set_Associated_Final_Chain
(Def_Id
, Add_Final_Chain
(Def_Id
));
6000 -- Freeze processing for enumeration types
6002 elsif Ekind
(Def_Id
) = E_Enumeration_Type
then
6004 -- We only have something to do if we have a non-standard
6005 -- representation (i.e. at least one literal whose pos value
6006 -- is not the same as its representation)
6008 if Has_Non_Standard_Rep
(Def_Id
) then
6009 Freeze_Enumeration_Type
(N
);
6012 -- Private types that are completed by a derivation from a private
6013 -- type have an internally generated full view, that needs to be
6014 -- frozen. This must be done explicitly because the two views share
6015 -- the freeze node, and the underlying full view is not visible when
6016 -- the freeze node is analyzed.
6018 elsif Is_Private_Type
(Def_Id
)
6019 and then Is_Derived_Type
(Def_Id
)
6020 and then Present
(Full_View
(Def_Id
))
6021 and then Is_Itype
(Full_View
(Def_Id
))
6022 and then Has_Private_Declaration
(Full_View
(Def_Id
))
6023 and then Freeze_Node
(Full_View
(Def_Id
)) = N
6025 Set_Entity
(N
, Full_View
(Def_Id
));
6026 Result
:= Freeze_Type
(N
);
6027 Set_Entity
(N
, Def_Id
);
6029 -- All other types require no expander action. There are such cases
6030 -- (e.g. task types and protected types). In such cases, the freeze
6031 -- nodes are there for use by Gigi.
6035 Freeze_Stream_Operations
(N
, Def_Id
);
6039 when RE_Not_Available
=>
6043 -------------------------
6044 -- Get_Simple_Init_Val --
6045 -------------------------
6047 function Get_Simple_Init_Val
6050 Size
: Uint
:= No_Uint
) return Node_Id
6057 -- This is the size to be used for computation of the appropriate
6058 -- initial value for the Normalize_Scalars and Initialize_Scalars case.
6062 -- These are the values computed by the procedure Check_Subtype_Bounds
6064 procedure Check_Subtype_Bounds
;
6065 -- This procedure examines the subtype T, and its ancestor subtypes and
6066 -- derived types to determine the best known information about the
6067 -- bounds of the subtype. After the call Lo_Bound is set either to
6068 -- No_Uint if no information can be determined, or to a value which
6069 -- represents a known low bound, i.e. a valid value of the subtype can
6070 -- not be less than this value. Hi_Bound is similarly set to a known
6071 -- high bound (valid value cannot be greater than this).
6073 --------------------------
6074 -- Check_Subtype_Bounds --
6075 --------------------------
6077 procedure Check_Subtype_Bounds
is
6086 Lo_Bound
:= No_Uint
;
6087 Hi_Bound
:= No_Uint
;
6089 -- Loop to climb ancestor subtypes and derived types
6093 if not Is_Discrete_Type
(ST1
) then
6097 Lo
:= Type_Low_Bound
(ST1
);
6098 Hi
:= Type_High_Bound
(ST1
);
6100 if Compile_Time_Known_Value
(Lo
) then
6101 Loval
:= Expr_Value
(Lo
);
6103 if Lo_Bound
= No_Uint
or else Lo_Bound
< Loval
then
6108 if Compile_Time_Known_Value
(Hi
) then
6109 Hival
:= Expr_Value
(Hi
);
6111 if Hi_Bound
= No_Uint
or else Hi_Bound
> Hival
then
6116 ST2
:= Ancestor_Subtype
(ST1
);
6122 exit when ST1
= ST2
;
6125 end Check_Subtype_Bounds
;
6127 -- Start of processing for Get_Simple_Init_Val
6130 -- For a private type, we should always have an underlying type
6131 -- (because this was already checked in Needs_Simple_Initialization).
6132 -- What we do is to get the value for the underlying type and then do
6133 -- an Unchecked_Convert to the private type.
6135 if Is_Private_Type
(T
) then
6136 Val
:= Get_Simple_Init_Val
(Underlying_Type
(T
), Loc
, Size
);
6138 -- A special case, if the underlying value is null, then qualify it
6139 -- with the underlying type, so that the null is properly typed
6140 -- Similarly, if it is an aggregate it must be qualified, because an
6141 -- unchecked conversion does not provide a context for it.
6143 if Nkind_In
(Val
, N_Null
, N_Aggregate
) then
6145 Make_Qualified_Expression
(Loc
,
6147 New_Occurrence_Of
(Underlying_Type
(T
), Loc
),
6151 Result
:= Unchecked_Convert_To
(T
, Val
);
6153 -- Don't truncate result (important for Initialize/Normalize_Scalars)
6155 if Nkind
(Result
) = N_Unchecked_Type_Conversion
6156 and then Is_Scalar_Type
(Underlying_Type
(T
))
6158 Set_No_Truncation
(Result
);
6163 -- For scalars, we must have normalize/initialize scalars case
6165 elsif Is_Scalar_Type
(T
) then
6166 pragma Assert
(Init_Or_Norm_Scalars
);
6168 -- Compute size of object. If it is given by the caller, we can use
6169 -- it directly, otherwise we use Esize (T) as an estimate. As far as
6170 -- we know this covers all cases correctly.
6172 if Size
= No_Uint
or else Size
<= Uint_0
then
6173 Size_To_Use
:= UI_Max
(Uint_1
, Esize
(T
));
6175 Size_To_Use
:= Size
;
6178 -- Maximum size to use is 64 bits, since we will create values
6179 -- of type Unsigned_64 and the range must fit this type.
6181 if Size_To_Use
/= No_Uint
and then Size_To_Use
> Uint_64
then
6182 Size_To_Use
:= Uint_64
;
6185 -- Check known bounds of subtype
6187 Check_Subtype_Bounds
;
6189 -- Processing for Normalize_Scalars case
6191 if Normalize_Scalars
then
6193 -- If zero is invalid, it is a convenient value to use that is
6194 -- for sure an appropriate invalid value in all situations.
6196 if Lo_Bound
/= No_Uint
and then Lo_Bound
> Uint_0
then
6197 Val
:= Make_Integer_Literal
(Loc
, 0);
6199 -- Cases where all one bits is the appropriate invalid value
6201 -- For modular types, all 1 bits is either invalid or valid. If
6202 -- it is valid, then there is nothing that can be done since there
6203 -- are no invalid values (we ruled out zero already).
6205 -- For signed integer types that have no negative values, either
6206 -- there is room for negative values, or there is not. If there
6207 -- is, then all 1 bits may be interpreted as minus one, which is
6208 -- certainly invalid. Alternatively it is treated as the largest
6209 -- positive value, in which case the observation for modular types
6212 -- For float types, all 1-bits is a NaN (not a number), which is
6213 -- certainly an appropriately invalid value.
6215 elsif Is_Unsigned_Type
(T
)
6216 or else Is_Floating_Point_Type
(T
)
6217 or else Is_Enumeration_Type
(T
)
6219 Val
:= Make_Integer_Literal
(Loc
, 2 ** Size_To_Use
- 1);
6221 -- Resolve as Unsigned_64, because the largest number we
6222 -- can generate is out of range of universal integer.
6224 Analyze_And_Resolve
(Val
, RTE
(RE_Unsigned_64
));
6226 -- Case of signed types
6230 Signed_Size
: constant Uint
:=
6231 UI_Min
(Uint_63
, Size_To_Use
- 1);
6234 -- Normally we like to use the most negative number. The
6235 -- one exception is when this number is in the known
6236 -- subtype range and the largest positive number is not in
6237 -- the known subtype range.
6239 -- For this exceptional case, use largest positive value
6241 if Lo_Bound
/= No_Uint
and then Hi_Bound
/= No_Uint
6242 and then Lo_Bound
<= (-(2 ** Signed_Size
))
6243 and then Hi_Bound
< 2 ** Signed_Size
6245 Val
:= Make_Integer_Literal
(Loc
, 2 ** Signed_Size
- 1);
6247 -- Normal case of largest negative value
6250 Val
:= Make_Integer_Literal
(Loc
, -(2 ** Signed_Size
));
6255 -- Here for Initialize_Scalars case
6258 -- For float types, use float values from System.Scalar_Values
6260 if Is_Floating_Point_Type
(T
) then
6261 if Root_Type
(T
) = Standard_Short_Float
then
6262 Val_RE
:= RE_IS_Isf
;
6263 elsif Root_Type
(T
) = Standard_Float
then
6264 Val_RE
:= RE_IS_Ifl
;
6265 elsif Root_Type
(T
) = Standard_Long_Float
then
6266 Val_RE
:= RE_IS_Ilf
;
6267 else pragma Assert
(Root_Type
(T
) = Standard_Long_Long_Float
);
6268 Val_RE
:= RE_IS_Ill
;
6271 -- If zero is invalid, use zero values from System.Scalar_Values
6273 elsif Lo_Bound
/= No_Uint
and then Lo_Bound
> Uint_0
then
6274 if Size_To_Use
<= 8 then
6275 Val_RE
:= RE_IS_Iz1
;
6276 elsif Size_To_Use
<= 16 then
6277 Val_RE
:= RE_IS_Iz2
;
6278 elsif Size_To_Use
<= 32 then
6279 Val_RE
:= RE_IS_Iz4
;
6281 Val_RE
:= RE_IS_Iz8
;
6284 -- For unsigned, use unsigned values from System.Scalar_Values
6286 elsif Is_Unsigned_Type
(T
) then
6287 if Size_To_Use
<= 8 then
6288 Val_RE
:= RE_IS_Iu1
;
6289 elsif Size_To_Use
<= 16 then
6290 Val_RE
:= RE_IS_Iu2
;
6291 elsif Size_To_Use
<= 32 then
6292 Val_RE
:= RE_IS_Iu4
;
6294 Val_RE
:= RE_IS_Iu8
;
6297 -- For signed, use signed values from System.Scalar_Values
6300 if Size_To_Use
<= 8 then
6301 Val_RE
:= RE_IS_Is1
;
6302 elsif Size_To_Use
<= 16 then
6303 Val_RE
:= RE_IS_Is2
;
6304 elsif Size_To_Use
<= 32 then
6305 Val_RE
:= RE_IS_Is4
;
6307 Val_RE
:= RE_IS_Is8
;
6311 Val
:= New_Occurrence_Of
(RTE
(Val_RE
), Loc
);
6314 -- The final expression is obtained by doing an unchecked conversion
6315 -- of this result to the base type of the required subtype. We use
6316 -- the base type to avoid the unchecked conversion from chopping
6317 -- bits, and then we set Kill_Range_Check to preserve the "bad"
6320 Result
:= Unchecked_Convert_To
(Base_Type
(T
), Val
);
6322 -- Ensure result is not truncated, since we want the "bad" bits
6323 -- and also kill range check on result.
6325 if Nkind
(Result
) = N_Unchecked_Type_Conversion
then
6326 Set_No_Truncation
(Result
);
6327 Set_Kill_Range_Check
(Result
, True);
6332 -- String or Wide_[Wide]_String (must have Initialize_Scalars set)
6334 elsif Root_Type
(T
) = Standard_String
6336 Root_Type
(T
) = Standard_Wide_String
6338 Root_Type
(T
) = Standard_Wide_Wide_String
6340 pragma Assert
(Init_Or_Norm_Scalars
);
6343 Make_Aggregate
(Loc
,
6344 Component_Associations
=> New_List
(
6345 Make_Component_Association
(Loc
,
6346 Choices
=> New_List
(
6347 Make_Others_Choice
(Loc
)),
6350 (Component_Type
(T
), Loc
, Esize
(Root_Type
(T
))))));
6352 -- Access type is initialized to null
6354 elsif Is_Access_Type
(T
) then
6358 -- No other possibilities should arise, since we should only be
6359 -- calling Get_Simple_Init_Val if Needs_Simple_Initialization
6360 -- returned True, indicating one of the above cases held.
6363 raise Program_Error
;
6367 when RE_Not_Available
=>
6369 end Get_Simple_Init_Val
;
6371 ------------------------------
6372 -- Has_New_Non_Standard_Rep --
6373 ------------------------------
6375 function Has_New_Non_Standard_Rep
(T
: Entity_Id
) return Boolean is
6377 if not Is_Derived_Type
(T
) then
6378 return Has_Non_Standard_Rep
(T
)
6379 or else Has_Non_Standard_Rep
(Root_Type
(T
));
6381 -- If Has_Non_Standard_Rep is not set on the derived type, the
6382 -- representation is fully inherited.
6384 elsif not Has_Non_Standard_Rep
(T
) then
6388 return First_Rep_Item
(T
) /= First_Rep_Item
(Root_Type
(T
));
6390 -- May need a more precise check here: the First_Rep_Item may
6391 -- be a stream attribute, which does not affect the representation
6394 end Has_New_Non_Standard_Rep
;
6400 function In_Runtime
(E
: Entity_Id
) return Boolean is
6405 while Scope
(S1
) /= Standard_Standard
loop
6409 return Chars
(S1
) = Name_System
or else Chars
(S1
) = Name_Ada
;
6412 ----------------------------
6413 -- Initialization_Warning --
6414 ----------------------------
6416 procedure Initialization_Warning
(E
: Entity_Id
) is
6417 Warning_Needed
: Boolean;
6420 Warning_Needed
:= False;
6422 if Ekind
(Current_Scope
) = E_Package
6423 and then Static_Elaboration_Desired
(Current_Scope
)
6426 if Is_Record_Type
(E
) then
6427 if Has_Discriminants
(E
)
6428 or else Is_Limited_Type
(E
)
6429 or else Has_Non_Standard_Rep
(E
)
6431 Warning_Needed
:= True;
6434 -- Verify that at least one component has an initializtion
6435 -- expression. No need for a warning on a type if all its
6436 -- components have no initialization.
6442 Comp
:= First_Component
(E
);
6443 while Present
(Comp
) loop
6444 if Ekind
(Comp
) = E_Discriminant
6446 (Nkind
(Parent
(Comp
)) = N_Component_Declaration
6447 and then Present
(Expression
(Parent
(Comp
))))
6449 Warning_Needed
:= True;
6453 Next_Component
(Comp
);
6458 if Warning_Needed
then
6460 ("Objects of the type cannot be initialized " &
6461 "statically by default?",
6467 Error_Msg_N
("Object cannot be initialized statically?", E
);
6470 end Initialization_Warning
;
6476 function Init_Formals
(Typ
: Entity_Id
) return List_Id
is
6477 Loc
: constant Source_Ptr
:= Sloc
(Typ
);
6481 -- First parameter is always _Init : in out typ. Note that we need
6482 -- this to be in/out because in the case of the task record value,
6483 -- there are default record fields (_Priority, _Size, -Task_Info)
6484 -- that may be referenced in the generated initialization routine.
6486 Formals
:= New_List
(
6487 Make_Parameter_Specification
(Loc
,
6488 Defining_Identifier
=>
6489 Make_Defining_Identifier
(Loc
, Name_uInit
),
6491 Out_Present
=> True,
6492 Parameter_Type
=> New_Reference_To
(Typ
, Loc
)));
6494 -- For task record value, or type that contains tasks, add two more
6495 -- formals, _Master : Master_Id and _Chain : in out Activation_Chain
6496 -- We also add these parameters for the task record type case.
6499 or else (Is_Record_Type
(Typ
) and then Is_Task_Record_Type
(Typ
))
6502 Make_Parameter_Specification
(Loc
,
6503 Defining_Identifier
=>
6504 Make_Defining_Identifier
(Loc
, Name_uMaster
),
6505 Parameter_Type
=> New_Reference_To
(RTE
(RE_Master_Id
), Loc
)));
6508 Make_Parameter_Specification
(Loc
,
6509 Defining_Identifier
=>
6510 Make_Defining_Identifier
(Loc
, Name_uChain
),
6512 Out_Present
=> True,
6514 New_Reference_To
(RTE
(RE_Activation_Chain
), Loc
)));
6517 Make_Parameter_Specification
(Loc
,
6518 Defining_Identifier
=>
6519 Make_Defining_Identifier
(Loc
, Name_uTask_Name
),
6522 New_Reference_To
(Standard_String
, Loc
)));
6528 when RE_Not_Available
=>
6532 -------------------------
6533 -- Init_Secondary_Tags --
6534 -------------------------
6536 procedure Init_Secondary_Tags
6539 Stmts_List
: List_Id
;
6540 Fixed_Comps
: Boolean := True;
6541 Variable_Comps
: Boolean := True)
6543 Loc
: constant Source_Ptr
:= Sloc
(Target
);
6545 procedure Inherit_CPP_Tag
6548 Tag_Comp
: Entity_Id
;
6549 Iface_Tag
: Node_Id
);
6550 -- Inherit the C++ tag of the secondary dispatch table of Typ associated
6551 -- with Iface. Tag_Comp is the component of Typ that stores Iface_Tag.
6553 procedure Initialize_Tag
6556 Tag_Comp
: Entity_Id
;
6557 Iface_Tag
: Node_Id
);
6558 -- Initialize the tag of the secondary dispatch table of Typ associated
6559 -- with Iface. Tag_Comp is the component of Typ that stores Iface_Tag.
6560 -- Compiling under the CPP full ABI compatibility mode, if the ancestor
6561 -- of Typ CPP tagged type we generate code to inherit the contents of
6562 -- the dispatch table directly from the ancestor.
6564 ---------------------
6565 -- Inherit_CPP_Tag --
6566 ---------------------
6568 procedure Inherit_CPP_Tag
6571 Tag_Comp
: Entity_Id
;
6572 Iface_Tag
: Node_Id
)
6575 pragma Assert
(Is_CPP_Class
(Etype
(Typ
)));
6577 Append_To
(Stmts_List
,
6578 Build_Inherit_Prims
(Loc
,
6581 Make_Selected_Component
(Loc
,
6582 Prefix
=> New_Copy_Tree
(Target
),
6583 Selector_Name
=> New_Reference_To
(Tag_Comp
, Loc
)),
6585 New_Reference_To
(Iface_Tag
, Loc
),
6587 UI_To_Int
(DT_Entry_Count
(First_Tag_Component
(Iface
)))));
6588 end Inherit_CPP_Tag
;
6590 --------------------
6591 -- Initialize_Tag --
6592 --------------------
6594 procedure Initialize_Tag
6597 Tag_Comp
: Entity_Id
;
6598 Iface_Tag
: Node_Id
)
6600 Comp_Typ
: Entity_Id
;
6601 Offset_To_Top_Comp
: Entity_Id
:= Empty
;
6604 -- Initialize the pointer to the secondary DT associated with the
6607 if not Is_Parent
(Iface
, Typ
) then
6608 Append_To
(Stmts_List
,
6609 Make_Assignment_Statement
(Loc
,
6611 Make_Selected_Component
(Loc
,
6612 Prefix
=> New_Copy_Tree
(Target
),
6613 Selector_Name
=> New_Reference_To
(Tag_Comp
, Loc
)),
6615 New_Reference_To
(Iface_Tag
, Loc
)));
6618 -- Issue error if Set_Offset_To_Top is not available in a
6619 -- configurable run-time environment.
6621 if not RTE_Available
(RE_Set_Offset_To_Top
) then
6622 Error_Msg_CRT
("abstract interface types", Typ
);
6626 Comp_Typ
:= Scope
(Tag_Comp
);
6628 -- Initialize the entries of the table of interfaces. We generate a
6629 -- different call when the parent of the type has variable size
6632 if Comp_Typ
/= Etype
(Comp_Typ
)
6633 and then Is_Variable_Size_Record
(Etype
(Comp_Typ
))
6634 and then Chars
(Tag_Comp
) /= Name_uTag
6637 (Present
(DT_Offset_To_Top_Func
(Tag_Comp
)));
6640 -- Set_Offset_To_Top
6642 -- Interface_T => Iface'Tag,
6643 -- Is_Constant => False,
6644 -- Offset_Value => n,
6645 -- Offset_Func => Fn'Address)
6647 Append_To
(Stmts_List
,
6648 Make_Procedure_Call_Statement
(Loc
,
6649 Name
=> New_Reference_To
(RTE
(RE_Set_Offset_To_Top
), Loc
),
6650 Parameter_Associations
=> New_List
(
6651 Make_Attribute_Reference
(Loc
,
6652 Prefix
=> New_Copy_Tree
(Target
),
6653 Attribute_Name
=> Name_Address
),
6655 Unchecked_Convert_To
(RTE
(RE_Tag
),
6657 (Node
(First_Elmt
(Access_Disp_Table
(Iface
))),
6660 New_Occurrence_Of
(Standard_False
, Loc
),
6662 Unchecked_Convert_To
6663 (RTE
(RE_Storage_Offset
),
6664 Make_Attribute_Reference
(Loc
,
6666 Make_Selected_Component
(Loc
,
6667 Prefix
=> New_Copy_Tree
(Target
),
6669 New_Reference_To
(Tag_Comp
, Loc
)),
6670 Attribute_Name
=> Name_Position
)),
6672 Unchecked_Convert_To
(RTE
(RE_Offset_To_Top_Function_Ptr
),
6673 Make_Attribute_Reference
(Loc
,
6674 Prefix
=> New_Reference_To
6675 (DT_Offset_To_Top_Func
(Tag_Comp
), Loc
),
6676 Attribute_Name
=> Name_Address
)))));
6678 -- In this case the next component stores the value of the
6679 -- offset to the top.
6681 Offset_To_Top_Comp
:= Next_Entity
(Tag_Comp
);
6682 pragma Assert
(Present
(Offset_To_Top_Comp
));
6684 Append_To
(Stmts_List
,
6685 Make_Assignment_Statement
(Loc
,
6687 Make_Selected_Component
(Loc
,
6688 Prefix
=> New_Copy_Tree
(Target
),
6689 Selector_Name
=> New_Reference_To
6690 (Offset_To_Top_Comp
, Loc
)),
6692 Make_Attribute_Reference
(Loc
,
6694 Make_Selected_Component
(Loc
,
6695 Prefix
=> New_Copy_Tree
(Target
),
6697 New_Reference_To
(Tag_Comp
, Loc
)),
6698 Attribute_Name
=> Name_Position
)));
6700 -- Normal case: No discriminants in the parent type
6704 -- Set_Offset_To_Top
6706 -- Interface_T => Iface'Tag,
6707 -- Is_Constant => True,
6708 -- Offset_Value => n,
6709 -- Offset_Func => null);
6711 Append_To
(Stmts_List
,
6712 Make_Procedure_Call_Statement
(Loc
,
6713 Name
=> New_Reference_To
6714 (RTE
(RE_Set_Offset_To_Top
), Loc
),
6715 Parameter_Associations
=> New_List
(
6716 Make_Attribute_Reference
(Loc
,
6717 Prefix
=> New_Copy_Tree
(Target
),
6718 Attribute_Name
=> Name_Address
),
6720 Unchecked_Convert_To
(RTE
(RE_Tag
),
6723 (Access_Disp_Table
(Iface
))),
6726 New_Occurrence_Of
(Standard_True
, Loc
),
6728 Unchecked_Convert_To
6729 (RTE
(RE_Storage_Offset
),
6730 Make_Attribute_Reference
(Loc
,
6732 Make_Selected_Component
(Loc
,
6733 Prefix
=> New_Copy_Tree
(Target
),
6735 New_Reference_To
(Tag_Comp
, Loc
)),
6736 Attribute_Name
=> Name_Position
)),
6744 Full_Typ
: Entity_Id
;
6745 Ifaces_List
: Elist_Id
;
6746 Ifaces_Comp_List
: Elist_Id
;
6747 Ifaces_Tag_List
: Elist_Id
;
6748 Iface_Elmt
: Elmt_Id
;
6749 Iface_Comp_Elmt
: Elmt_Id
;
6750 Iface_Tag_Elmt
: Elmt_Id
;
6752 In_Variable_Pos
: Boolean;
6754 -- Start of processing for Init_Secondary_Tags
6757 -- Handle private types
6759 if Present
(Full_View
(Typ
)) then
6760 Full_Typ
:= Full_View
(Typ
);
6765 Collect_Interfaces_Info
6766 (Full_Typ
, Ifaces_List
, Ifaces_Comp_List
, Ifaces_Tag_List
);
6768 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
6769 Iface_Comp_Elmt
:= First_Elmt
(Ifaces_Comp_List
);
6770 Iface_Tag_Elmt
:= First_Elmt
(Ifaces_Tag_List
);
6771 while Present
(Iface_Elmt
) loop
6772 Tag_Comp
:= Node
(Iface_Comp_Elmt
);
6774 -- If we are compiling under the CPP full ABI compatibility mode and
6775 -- the ancestor is a CPP_Pragma tagged type then we generate code to
6776 -- inherit the contents of the dispatch table directly from the
6779 if Is_CPP_Class
(Etype
(Full_Typ
)) then
6780 Inherit_CPP_Tag
(Full_Typ
,
6781 Iface
=> Node
(Iface_Elmt
),
6782 Tag_Comp
=> Tag_Comp
,
6783 Iface_Tag
=> Node
(Iface_Tag_Elmt
));
6785 -- Otherwise we generate code to initialize the tag
6788 -- Check if the parent of the record type has variable size
6791 In_Variable_Pos
:= Scope
(Tag_Comp
) /= Etype
(Scope
(Tag_Comp
))
6792 and then Is_Variable_Size_Record
(Etype
(Scope
(Tag_Comp
)));
6794 if (In_Variable_Pos
and then Variable_Comps
)
6795 or else (not In_Variable_Pos
and then Fixed_Comps
)
6797 Initialize_Tag
(Full_Typ
,
6798 Iface
=> Node
(Iface_Elmt
),
6799 Tag_Comp
=> Tag_Comp
,
6800 Iface_Tag
=> Node
(Iface_Tag_Elmt
));
6804 Next_Elmt
(Iface_Elmt
);
6805 Next_Elmt
(Iface_Comp_Elmt
);
6806 Next_Elmt
(Iface_Tag_Elmt
);
6808 end Init_Secondary_Tags
;
6810 -----------------------------
6811 -- Is_Variable_Size_Record --
6812 -----------------------------
6814 function Is_Variable_Size_Record
(E
: Entity_Id
) return Boolean is
6816 Comp_Typ
: Entity_Id
;
6820 pragma Assert
(Is_Record_Type
(E
));
6822 Comp
:= First_Entity
(E
);
6823 while Present
(Comp
) loop
6824 Comp_Typ
:= Etype
(Comp
);
6826 if Is_Record_Type
(Comp_Typ
) then
6828 -- Recursive call if the record type has discriminants
6830 if Has_Discriminants
(Comp_Typ
)
6831 and then Is_Variable_Size_Record
(Comp_Typ
)
6836 elsif Is_Array_Type
(Comp_Typ
) then
6838 -- Check if some index is initialized with a non-constant value
6840 Idx
:= First_Index
(Comp_Typ
);
6841 while Present
(Idx
) loop
6842 if Nkind
(Idx
) = N_Range
then
6843 if (Nkind
(Low_Bound
(Idx
)) = N_Identifier
6844 and then Present
(Entity
(Low_Bound
(Idx
)))
6846 Ekind
(Entity
(Low_Bound
(Idx
))) /= E_Constant
)
6848 (Nkind
(High_Bound
(Idx
)) = N_Identifier
6849 and then Present
(Entity
(High_Bound
(Idx
)))
6851 Ekind
(Entity
(High_Bound
(Idx
))) /= E_Constant
)
6857 Idx
:= Next_Index
(Idx
);
6865 end Is_Variable_Size_Record
;
6867 ----------------------------------------
6868 -- Make_Controlling_Function_Wrappers --
6869 ----------------------------------------
6871 procedure Make_Controlling_Function_Wrappers
6872 (Tag_Typ
: Entity_Id
;
6873 Decl_List
: out List_Id
;
6874 Body_List
: out List_Id
)
6876 Loc
: constant Source_Ptr
:= Sloc
(Tag_Typ
);
6877 Prim_Elmt
: Elmt_Id
;
6879 Actual_List
: List_Id
;
6880 Formal_List
: List_Id
;
6882 Par_Formal
: Entity_Id
;
6883 Formal_Node
: Node_Id
;
6884 Func_Body
: Node_Id
;
6885 Func_Decl
: Node_Id
;
6886 Func_Spec
: Node_Id
;
6887 Return_Stmt
: Node_Id
;
6890 Decl_List
:= New_List
;
6891 Body_List
:= New_List
;
6893 Prim_Elmt
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
6895 while Present
(Prim_Elmt
) loop
6896 Subp
:= Node
(Prim_Elmt
);
6898 -- If a primitive function with a controlling result of the type has
6899 -- not been overridden by the user, then we must create a wrapper
6900 -- function here that effectively overrides it and invokes the
6901 -- (non-abstract) parent function. This can only occur for a null
6902 -- extension. Note that functions with anonymous controlling access
6903 -- results don't qualify and must be overridden. We also exclude
6904 -- Input attributes, since each type will have its own version of
6905 -- Input constructed by the expander. The test for Comes_From_Source
6906 -- is needed to distinguish inherited operations from renamings
6907 -- (which also have Alias set).
6909 -- The function may be abstract, or require_Overriding may be set
6910 -- for it, because tests for null extensions may already have reset
6911 -- the Is_Abstract_Subprogram_Flag. If Requires_Overriding is not
6912 -- set, functions that need wrappers are recognized by having an
6913 -- alias that returns the parent type.
6915 if Comes_From_Source
(Subp
)
6916 or else No
(Alias
(Subp
))
6917 or else Ekind
(Subp
) /= E_Function
6918 or else not Has_Controlling_Result
(Subp
)
6919 or else Is_Access_Type
(Etype
(Subp
))
6920 or else Is_Abstract_Subprogram
(Alias
(Subp
))
6921 or else Is_TSS
(Subp
, TSS_Stream_Input
)
6925 elsif Is_Abstract_Subprogram
(Subp
)
6926 or else Requires_Overriding
(Subp
)
6928 (Is_Null_Extension
(Etype
(Subp
))
6929 and then Etype
(Alias
(Subp
)) /= Etype
(Subp
))
6931 Formal_List
:= No_List
;
6932 Formal
:= First_Formal
(Subp
);
6934 if Present
(Formal
) then
6935 Formal_List
:= New_List
;
6937 while Present
(Formal
) loop
6939 (Make_Parameter_Specification
6941 Defining_Identifier
=>
6942 Make_Defining_Identifier
(Sloc
(Formal
),
6943 Chars
=> Chars
(Formal
)),
6944 In_Present
=> In_Present
(Parent
(Formal
)),
6945 Out_Present
=> Out_Present
(Parent
(Formal
)),
6946 Null_Exclusion_Present
=>
6947 Null_Exclusion_Present
(Parent
(Formal
)),
6949 New_Reference_To
(Etype
(Formal
), Loc
),
6951 New_Copy_Tree
(Expression
(Parent
(Formal
)))),
6954 Next_Formal
(Formal
);
6959 Make_Function_Specification
(Loc
,
6960 Defining_Unit_Name
=>
6961 Make_Defining_Identifier
(Loc
,
6962 Chars
=> Chars
(Subp
)),
6963 Parameter_Specifications
=> Formal_List
,
6964 Result_Definition
=>
6965 New_Reference_To
(Etype
(Subp
), Loc
));
6967 Func_Decl
:= Make_Subprogram_Declaration
(Loc
, Func_Spec
);
6968 Append_To
(Decl_List
, Func_Decl
);
6970 -- Build a wrapper body that calls the parent function. The body
6971 -- contains a single return statement that returns an extension
6972 -- aggregate whose ancestor part is a call to the parent function,
6973 -- passing the formals as actuals (with any controlling arguments
6974 -- converted to the types of the corresponding formals of the
6975 -- parent function, which might be anonymous access types), and
6976 -- having a null extension.
6978 Formal
:= First_Formal
(Subp
);
6979 Par_Formal
:= First_Formal
(Alias
(Subp
));
6980 Formal_Node
:= First
(Formal_List
);
6982 if Present
(Formal
) then
6983 Actual_List
:= New_List
;
6985 Actual_List
:= No_List
;
6988 while Present
(Formal
) loop
6989 if Is_Controlling_Formal
(Formal
) then
6990 Append_To
(Actual_List
,
6991 Make_Type_Conversion
(Loc
,
6993 New_Occurrence_Of
(Etype
(Par_Formal
), Loc
),
6996 (Defining_Identifier
(Formal_Node
), Loc
)));
7001 (Defining_Identifier
(Formal_Node
), Loc
));
7004 Next_Formal
(Formal
);
7005 Next_Formal
(Par_Formal
);
7010 Make_Simple_Return_Statement
(Loc
,
7012 Make_Extension_Aggregate
(Loc
,
7014 Make_Function_Call
(Loc
,
7015 Name
=> New_Reference_To
(Alias
(Subp
), Loc
),
7016 Parameter_Associations
=> Actual_List
),
7017 Null_Record_Present
=> True));
7020 Make_Subprogram_Body
(Loc
,
7021 Specification
=> New_Copy_Tree
(Func_Spec
),
7022 Declarations
=> Empty_List
,
7023 Handled_Statement_Sequence
=>
7024 Make_Handled_Sequence_Of_Statements
(Loc
,
7025 Statements
=> New_List
(Return_Stmt
)));
7027 Set_Defining_Unit_Name
7028 (Specification
(Func_Body
),
7029 Make_Defining_Identifier
(Loc
, Chars
(Subp
)));
7031 Append_To
(Body_List
, Func_Body
);
7033 -- Replace the inherited function with the wrapper function
7034 -- in the primitive operations list.
7036 Override_Dispatching_Operation
7037 (Tag_Typ
, Subp
, New_Op
=> Defining_Unit_Name
(Func_Spec
));
7041 Next_Elmt
(Prim_Elmt
);
7043 end Make_Controlling_Function_Wrappers
;
7049 -- <Make_Eq_if shared components>
7051 -- when V1 => <Make_Eq_Case> on subcomponents
7053 -- when Vn => <Make_Eq_Case> on subcomponents
7056 function Make_Eq_Case
7059 Discr
: Entity_Id
:= Empty
) return List_Id
7061 Loc
: constant Source_Ptr
:= Sloc
(E
);
7062 Result
: constant List_Id
:= New_List
;
7067 Append_To
(Result
, Make_Eq_If
(E
, Component_Items
(CL
)));
7069 if No
(Variant_Part
(CL
)) then
7073 Variant
:= First_Non_Pragma
(Variants
(Variant_Part
(CL
)));
7075 if No
(Variant
) then
7079 Alt_List
:= New_List
;
7081 while Present
(Variant
) loop
7082 Append_To
(Alt_List
,
7083 Make_Case_Statement_Alternative
(Loc
,
7084 Discrete_Choices
=> New_Copy_List
(Discrete_Choices
(Variant
)),
7085 Statements
=> Make_Eq_Case
(E
, Component_List
(Variant
))));
7087 Next_Non_Pragma
(Variant
);
7090 -- If we have an Unchecked_Union, use one of the parameters that
7091 -- captures the discriminants.
7093 if Is_Unchecked_Union
(E
) then
7095 Make_Case_Statement
(Loc
,
7096 Expression
=> New_Reference_To
(Discr
, Loc
),
7097 Alternatives
=> Alt_List
));
7101 Make_Case_Statement
(Loc
,
7103 Make_Selected_Component
(Loc
,
7104 Prefix
=> Make_Identifier
(Loc
, Name_X
),
7105 Selector_Name
=> New_Copy
(Name
(Variant_Part
(CL
)))),
7106 Alternatives
=> Alt_List
));
7127 -- or a null statement if the list L is empty
7131 L
: List_Id
) return Node_Id
7133 Loc
: constant Source_Ptr
:= Sloc
(E
);
7135 Field_Name
: Name_Id
;
7140 return Make_Null_Statement
(Loc
);
7145 C
:= First_Non_Pragma
(L
);
7146 while Present
(C
) loop
7147 Field_Name
:= Chars
(Defining_Identifier
(C
));
7149 -- The tags must not be compared: they are not part of the value.
7150 -- Ditto for the controller component, if present.
7152 -- Note also that in the following, we use Make_Identifier for
7153 -- the component names. Use of New_Reference_To to identify the
7154 -- components would be incorrect because the wrong entities for
7155 -- discriminants could be picked up in the private type case.
7157 if Field_Name
/= Name_uTag
7159 Field_Name
/= Name_uController
7161 Evolve_Or_Else
(Cond
,
7164 Make_Selected_Component
(Loc
,
7165 Prefix
=> Make_Identifier
(Loc
, Name_X
),
7167 Make_Identifier
(Loc
, Field_Name
)),
7170 Make_Selected_Component
(Loc
,
7171 Prefix
=> Make_Identifier
(Loc
, Name_Y
),
7173 Make_Identifier
(Loc
, Field_Name
))));
7176 Next_Non_Pragma
(C
);
7180 return Make_Null_Statement
(Loc
);
7184 Make_Implicit_If_Statement
(E
,
7186 Then_Statements
=> New_List
(
7187 Make_Simple_Return_Statement
(Loc
,
7188 Expression
=> New_Occurrence_Of
(Standard_False
, Loc
))));
7193 -------------------------------
7194 -- Make_Null_Procedure_Specs --
7195 -------------------------------
7197 procedure Make_Null_Procedure_Specs
7198 (Tag_Typ
: Entity_Id
;
7199 Decl_List
: out List_Id
)
7201 Loc
: constant Source_Ptr
:= Sloc
(Tag_Typ
);
7203 Formal_List
: List_Id
;
7204 Parent_Subp
: Entity_Id
;
7205 Prim_Elmt
: Elmt_Id
;
7206 Proc_Spec
: Node_Id
;
7207 Proc_Decl
: Node_Id
;
7210 function Is_Null_Interface_Primitive
(E
: Entity_Id
) return Boolean;
7211 -- Returns True if E is a null procedure that is an interface primitive
7213 ---------------------------------
7214 -- Is_Null_Interface_Primitive --
7215 ---------------------------------
7217 function Is_Null_Interface_Primitive
(E
: Entity_Id
) return Boolean is
7219 return Comes_From_Source
(E
)
7220 and then Is_Dispatching_Operation
(E
)
7221 and then Ekind
(E
) = E_Procedure
7222 and then Null_Present
(Parent
(E
))
7223 and then Is_Interface
(Find_Dispatching_Type
(E
));
7224 end Is_Null_Interface_Primitive
;
7226 -- Start of processing for Make_Null_Procedure_Specs
7229 Decl_List
:= New_List
;
7230 Prim_Elmt
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
7231 while Present
(Prim_Elmt
) loop
7232 Subp
:= Node
(Prim_Elmt
);
7234 -- If a null procedure inherited from an interface has not been
7235 -- overridden, then we build a null procedure declaration to
7236 -- override the inherited procedure.
7238 Parent_Subp
:= Alias
(Subp
);
7240 if Present
(Parent_Subp
)
7241 and then Is_Null_Interface_Primitive
(Parent_Subp
)
7243 Formal_List
:= No_List
;
7244 Formal
:= First_Formal
(Subp
);
7246 if Present
(Formal
) then
7247 Formal_List
:= New_List
;
7249 while Present
(Formal
) loop
7251 (Make_Parameter_Specification
(Loc
,
7252 Defining_Identifier
=>
7253 Make_Defining_Identifier
(Sloc
(Formal
),
7254 Chars
=> Chars
(Formal
)),
7255 In_Present
=> In_Present
(Parent
(Formal
)),
7256 Out_Present
=> Out_Present
(Parent
(Formal
)),
7257 Null_Exclusion_Present
=>
7258 Null_Exclusion_Present
(Parent
(Formal
)),
7260 New_Reference_To
(Etype
(Formal
), Loc
),
7262 New_Copy_Tree
(Expression
(Parent
(Formal
)))),
7265 Next_Formal
(Formal
);
7270 Make_Procedure_Specification
(Loc
,
7271 Defining_Unit_Name
=>
7272 Make_Defining_Identifier
(Loc
, Chars
(Subp
)),
7273 Parameter_Specifications
=> Formal_List
);
7274 Set_Null_Present
(Proc_Spec
);
7276 Proc_Decl
:= Make_Subprogram_Declaration
(Loc
, Proc_Spec
);
7277 Append_To
(Decl_List
, Proc_Decl
);
7278 Analyze
(Proc_Decl
);
7281 Next_Elmt
(Prim_Elmt
);
7283 end Make_Null_Procedure_Specs
;
7285 -------------------------------------
7286 -- Make_Predefined_Primitive_Specs --
7287 -------------------------------------
7289 procedure Make_Predefined_Primitive_Specs
7290 (Tag_Typ
: Entity_Id
;
7291 Predef_List
: out List_Id
;
7292 Renamed_Eq
: out Entity_Id
)
7294 Loc
: constant Source_Ptr
:= Sloc
(Tag_Typ
);
7295 Res
: constant List_Id
:= New_List
;
7297 Eq_Needed
: Boolean;
7299 Eq_Name
: Name_Id
:= Name_Op_Eq
;
7301 function Is_Predefined_Eq_Renaming
(Prim
: Node_Id
) return Boolean;
7302 -- Returns true if Prim is a renaming of an unresolved predefined
7303 -- equality operation.
7305 -------------------------------
7306 -- Is_Predefined_Eq_Renaming --
7307 -------------------------------
7309 function Is_Predefined_Eq_Renaming
(Prim
: Node_Id
) return Boolean is
7311 return Chars
(Prim
) /= Name_Op_Eq
7312 and then Present
(Alias
(Prim
))
7313 and then Comes_From_Source
(Prim
)
7314 and then Is_Intrinsic_Subprogram
(Alias
(Prim
))
7315 and then Chars
(Alias
(Prim
)) = Name_Op_Eq
;
7316 end Is_Predefined_Eq_Renaming
;
7318 -- Start of processing for Make_Predefined_Primitive_Specs
7321 Renamed_Eq
:= Empty
;
7325 Append_To
(Res
, Predef_Spec_Or_Body
(Loc
,
7328 Profile
=> New_List
(
7329 Make_Parameter_Specification
(Loc
,
7330 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_X
),
7331 Parameter_Type
=> New_Reference_To
(Tag_Typ
, Loc
))),
7333 Ret_Type
=> Standard_Long_Long_Integer
));
7335 -- Spec of _Alignment
7337 Append_To
(Res
, Predef_Spec_Or_Body
(Loc
,
7339 Name
=> Name_uAlignment
,
7340 Profile
=> New_List
(
7341 Make_Parameter_Specification
(Loc
,
7342 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_X
),
7343 Parameter_Type
=> New_Reference_To
(Tag_Typ
, Loc
))),
7345 Ret_Type
=> Standard_Integer
));
7347 -- Specs for dispatching stream attributes
7350 Stream_Op_TSS_Names
:
7351 constant array (Integer range <>) of TSS_Name_Type
:=
7358 for Op
in Stream_Op_TSS_Names
'Range loop
7359 if Stream_Operation_OK
(Tag_Typ
, Stream_Op_TSS_Names
(Op
)) then
7361 Predef_Stream_Attr_Spec
(Loc
, Tag_Typ
,
7362 Stream_Op_TSS_Names
(Op
)));
7367 -- Spec of "=" is expanded if the type is not limited and if a
7368 -- user defined "=" was not already declared for the non-full
7369 -- view of a private extension
7371 if not Is_Limited_Type
(Tag_Typ
) then
7373 Prim
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
7374 while Present
(Prim
) loop
7376 -- If a primitive is encountered that renames the predefined
7377 -- equality operator before reaching any explicit equality
7378 -- primitive, then we still need to create a predefined
7379 -- equality function, because calls to it can occur via
7380 -- the renaming. A new name is created for the equality
7381 -- to avoid conflicting with any user-defined equality.
7382 -- (Note that this doesn't account for renamings of
7383 -- equality nested within subpackages???)
7385 if Is_Predefined_Eq_Renaming
(Node
(Prim
)) then
7386 Eq_Name
:= New_External_Name
(Chars
(Node
(Prim
)), 'E');
7388 -- User-defined equality
7390 elsif Chars
(Node
(Prim
)) = Name_Op_Eq
7391 and then (No
(Alias
(Node
(Prim
)))
7392 or else Nkind
(Unit_Declaration_Node
(Node
(Prim
))) =
7393 N_Subprogram_Renaming_Declaration
)
7394 and then Etype
(First_Formal
(Node
(Prim
))) =
7395 Etype
(Next_Formal
(First_Formal
(Node
(Prim
))))
7396 and then Base_Type
(Etype
(Node
(Prim
))) = Standard_Boolean
7401 -- If the parent is not an interface type and has an abstract
7402 -- equality function, the inherited equality is abstract as well,
7403 -- and no body can be created for it.
7405 elsif Chars
(Node
(Prim
)) = Name_Op_Eq
7406 and then not Is_Interface
(Etype
(Tag_Typ
))
7407 and then Present
(Alias
(Node
(Prim
)))
7408 and then Is_Abstract_Subprogram
(Alias
(Node
(Prim
)))
7417 -- If a renaming of predefined equality was found but there was no
7418 -- user-defined equality (so Eq_Needed is still true), then set the
7419 -- name back to Name_Op_Eq. But in the case where a user-defined
7420 -- equality was located after such a renaming, then the predefined
7421 -- equality function is still needed, so Eq_Needed must be set back
7424 if Eq_Name
/= Name_Op_Eq
then
7426 Eq_Name
:= Name_Op_Eq
;
7433 Eq_Spec
:= Predef_Spec_Or_Body
(Loc
,
7436 Profile
=> New_List
(
7437 Make_Parameter_Specification
(Loc
,
7438 Defining_Identifier
=>
7439 Make_Defining_Identifier
(Loc
, Name_X
),
7440 Parameter_Type
=> New_Reference_To
(Tag_Typ
, Loc
)),
7441 Make_Parameter_Specification
(Loc
,
7442 Defining_Identifier
=>
7443 Make_Defining_Identifier
(Loc
, Name_Y
),
7444 Parameter_Type
=> New_Reference_To
(Tag_Typ
, Loc
))),
7445 Ret_Type
=> Standard_Boolean
);
7446 Append_To
(Res
, Eq_Spec
);
7448 if Eq_Name
/= Name_Op_Eq
then
7449 Renamed_Eq
:= Defining_Unit_Name
(Specification
(Eq_Spec
));
7451 Prim
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
7452 while Present
(Prim
) loop
7454 -- Any renamings of equality that appeared before an
7455 -- overriding equality must be updated to refer to the
7456 -- entity for the predefined equality, otherwise calls via
7457 -- the renaming would get incorrectly resolved to call the
7458 -- user-defined equality function.
7460 if Is_Predefined_Eq_Renaming
(Node
(Prim
)) then
7461 Set_Alias
(Node
(Prim
), Renamed_Eq
);
7463 -- Exit upon encountering a user-defined equality
7465 elsif Chars
(Node
(Prim
)) = Name_Op_Eq
7466 and then No
(Alias
(Node
(Prim
)))
7476 -- Spec for dispatching assignment
7478 Append_To
(Res
, Predef_Spec_Or_Body
(Loc
,
7480 Name
=> Name_uAssign
,
7481 Profile
=> New_List
(
7482 Make_Parameter_Specification
(Loc
,
7483 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_X
),
7484 Out_Present
=> True,
7485 Parameter_Type
=> New_Reference_To
(Tag_Typ
, Loc
)),
7487 Make_Parameter_Specification
(Loc
,
7488 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_Y
),
7489 Parameter_Type
=> New_Reference_To
(Tag_Typ
, Loc
)))));
7492 -- Ada 2005: Generate declarations for the following primitive
7493 -- operations for limited interfaces and synchronized types that
7494 -- implement a limited interface.
7496 -- Disp_Asynchronous_Select
7497 -- Disp_Conditional_Select
7498 -- Disp_Get_Prim_Op_Kind
7501 -- Disp_Timed_Select
7503 -- These operations cannot be implemented on VM targets, so we simply
7504 -- disable their generation in this case. We also disable generation
7505 -- of these bodies if No_Dispatching_Calls is active.
7507 if Ada_Version
>= Ada_05
7508 and then VM_Target
= No_VM
7510 -- These primitives are defined abstract in interface types
7512 if Is_Interface
(Tag_Typ
)
7513 and then Is_Limited_Record
(Tag_Typ
)
7516 Make_Abstract_Subprogram_Declaration
(Loc
,
7518 Make_Disp_Asynchronous_Select_Spec
(Tag_Typ
)));
7521 Make_Abstract_Subprogram_Declaration
(Loc
,
7523 Make_Disp_Conditional_Select_Spec
(Tag_Typ
)));
7526 Make_Abstract_Subprogram_Declaration
(Loc
,
7528 Make_Disp_Get_Prim_Op_Kind_Spec
(Tag_Typ
)));
7531 Make_Abstract_Subprogram_Declaration
(Loc
,
7533 Make_Disp_Get_Task_Id_Spec
(Tag_Typ
)));
7536 Make_Abstract_Subprogram_Declaration
(Loc
,
7538 Make_Disp_Requeue_Spec
(Tag_Typ
)));
7541 Make_Abstract_Subprogram_Declaration
(Loc
,
7543 Make_Disp_Timed_Select_Spec
(Tag_Typ
)));
7545 -- If the ancestor is an interface type we declare non-abstract
7546 -- primitives to override the abstract primitives of the interface
7549 elsif (not Is_Interface
(Tag_Typ
)
7550 and then Is_Interface
(Etype
(Tag_Typ
))
7551 and then Is_Limited_Record
(Etype
(Tag_Typ
)))
7553 (Is_Concurrent_Record_Type
(Tag_Typ
)
7554 and then Has_Abstract_Interfaces
(Tag_Typ
))
7557 Make_Subprogram_Declaration
(Loc
,
7559 Make_Disp_Asynchronous_Select_Spec
(Tag_Typ
)));
7562 Make_Subprogram_Declaration
(Loc
,
7564 Make_Disp_Conditional_Select_Spec
(Tag_Typ
)));
7567 Make_Subprogram_Declaration
(Loc
,
7569 Make_Disp_Get_Prim_Op_Kind_Spec
(Tag_Typ
)));
7572 Make_Subprogram_Declaration
(Loc
,
7574 Make_Disp_Get_Task_Id_Spec
(Tag_Typ
)));
7577 Make_Subprogram_Declaration
(Loc
,
7579 Make_Disp_Requeue_Spec
(Tag_Typ
)));
7582 Make_Subprogram_Declaration
(Loc
,
7584 Make_Disp_Timed_Select_Spec
(Tag_Typ
)));
7588 -- Specs for finalization actions that may be required in case a future
7589 -- extension contain a controlled element. We generate those only for
7590 -- root tagged types where they will get dummy bodies or when the type
7591 -- has controlled components and their body must be generated. It is
7592 -- also impossible to provide those for tagged types defined within
7593 -- s-finimp since it would involve circularity problems
7595 if In_Finalization_Root
(Tag_Typ
) then
7598 -- We also skip these if finalization is not available
7600 elsif Restriction_Active
(No_Finalization
) then
7603 elsif Etype
(Tag_Typ
) = Tag_Typ
7604 or else Controlled_Type
(Tag_Typ
)
7606 -- Ada 2005 (AI-251): We must also generate these subprograms if
7607 -- the immediate ancestor is an interface to ensure the correct
7608 -- initialization of its dispatch table.
7610 or else (not Is_Interface
(Tag_Typ
)
7612 Is_Interface
(Etype
(Tag_Typ
)))
7614 if not Is_Limited_Type
(Tag_Typ
) then
7616 Predef_Deep_Spec
(Loc
, Tag_Typ
, TSS_Deep_Adjust
));
7619 Append_To
(Res
, Predef_Deep_Spec
(Loc
, Tag_Typ
, TSS_Deep_Finalize
));
7623 end Make_Predefined_Primitive_Specs
;
7625 ---------------------------------
7626 -- Needs_Simple_Initialization --
7627 ---------------------------------
7629 function Needs_Simple_Initialization
(T
: Entity_Id
) return Boolean is
7631 -- Check for private type, in which case test applies to the underlying
7632 -- type of the private type.
7634 if Is_Private_Type
(T
) then
7636 RT
: constant Entity_Id
:= Underlying_Type
(T
);
7639 if Present
(RT
) then
7640 return Needs_Simple_Initialization
(RT
);
7646 -- Cases needing simple initialization are access types, and, if pragma
7647 -- Normalize_Scalars or Initialize_Scalars is in effect, then all scalar
7650 elsif Is_Access_Type
(T
)
7651 or else (Init_Or_Norm_Scalars
and then (Is_Scalar_Type
(T
)))
7655 -- If Initialize/Normalize_Scalars is in effect, string objects also
7656 -- need initialization, unless they are created in the course of
7657 -- expanding an aggregate (since in the latter case they will be
7658 -- filled with appropriate initializing values before they are used).
7660 elsif Init_Or_Norm_Scalars
7662 (Root_Type
(T
) = Standard_String
7663 or else Root_Type
(T
) = Standard_Wide_String
7664 or else Root_Type
(T
) = Standard_Wide_Wide_String
)
7667 or else Nkind
(Associated_Node_For_Itype
(T
)) /= N_Aggregate
)
7674 end Needs_Simple_Initialization
;
7676 ----------------------
7677 -- Predef_Deep_Spec --
7678 ----------------------
7680 function Predef_Deep_Spec
7682 Tag_Typ
: Entity_Id
;
7683 Name
: TSS_Name_Type
;
7684 For_Body
: Boolean := False) return Node_Id
7690 if Name
= TSS_Deep_Finalize
then
7692 Type_B
:= Standard_Boolean
;
7696 Make_Parameter_Specification
(Loc
,
7697 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_L
),
7699 Out_Present
=> True,
7701 New_Reference_To
(RTE
(RE_Finalizable_Ptr
), Loc
)));
7702 Type_B
:= Standard_Short_Short_Integer
;
7706 Make_Parameter_Specification
(Loc
,
7707 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_V
),
7709 Out_Present
=> True,
7710 Parameter_Type
=> New_Reference_To
(Tag_Typ
, Loc
)));
7713 Make_Parameter_Specification
(Loc
,
7714 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_B
),
7715 Parameter_Type
=> New_Reference_To
(Type_B
, Loc
)));
7717 return Predef_Spec_Or_Body
(Loc
,
7718 Name
=> Make_TSS_Name
(Tag_Typ
, Name
),
7721 For_Body
=> For_Body
);
7724 when RE_Not_Available
=>
7726 end Predef_Deep_Spec
;
7728 -------------------------
7729 -- Predef_Spec_Or_Body --
7730 -------------------------
7732 function Predef_Spec_Or_Body
7734 Tag_Typ
: Entity_Id
;
7737 Ret_Type
: Entity_Id
:= Empty
;
7738 For_Body
: Boolean := False) return Node_Id
7740 Id
: constant Entity_Id
:= Make_Defining_Identifier
(Loc
, Name
);
7744 Set_Is_Public
(Id
, Is_Public
(Tag_Typ
));
7746 -- The internal flag is set to mark these declarations because they have
7747 -- specific properties. First, they are primitives even if they are not
7748 -- defined in the type scope (the freezing point is not necessarily in
7749 -- the same scope). Second, the predefined equality can be overridden by
7750 -- a user-defined equality, no body will be generated in this case.
7752 Set_Is_Internal
(Id
);
7754 if not Debug_Generated_Code
then
7755 Set_Debug_Info_Off
(Id
);
7758 if No
(Ret_Type
) then
7760 Make_Procedure_Specification
(Loc
,
7761 Defining_Unit_Name
=> Id
,
7762 Parameter_Specifications
=> Profile
);
7765 Make_Function_Specification
(Loc
,
7766 Defining_Unit_Name
=> Id
,
7767 Parameter_Specifications
=> Profile
,
7768 Result_Definition
=>
7769 New_Reference_To
(Ret_Type
, Loc
));
7772 if Is_Interface
(Tag_Typ
) then
7773 return Make_Abstract_Subprogram_Declaration
(Loc
, Spec
);
7775 -- If body case, return empty subprogram body. Note that this is ill-
7776 -- formed, because there is not even a null statement, and certainly not
7777 -- a return in the function case. The caller is expected to do surgery
7778 -- on the body to add the appropriate stuff.
7781 return Make_Subprogram_Body
(Loc
, Spec
, Empty_List
, Empty
);
7783 -- For the case of an Input attribute predefined for an abstract type,
7784 -- generate an abstract specification. This will never be called, but we
7785 -- need the slot allocated in the dispatching table so that attributes
7786 -- typ'Class'Input and typ'Class'Output will work properly.
7788 elsif Is_TSS
(Name
, TSS_Stream_Input
)
7789 and then Is_Abstract_Type
(Tag_Typ
)
7791 return Make_Abstract_Subprogram_Declaration
(Loc
, Spec
);
7793 -- Normal spec case, where we return a subprogram declaration
7796 return Make_Subprogram_Declaration
(Loc
, Spec
);
7798 end Predef_Spec_Or_Body
;
7800 -----------------------------
7801 -- Predef_Stream_Attr_Spec --
7802 -----------------------------
7804 function Predef_Stream_Attr_Spec
7806 Tag_Typ
: Entity_Id
;
7807 Name
: TSS_Name_Type
;
7808 For_Body
: Boolean := False) return Node_Id
7810 Ret_Type
: Entity_Id
;
7813 if Name
= TSS_Stream_Input
then
7814 Ret_Type
:= Tag_Typ
;
7819 return Predef_Spec_Or_Body
(Loc
,
7820 Name
=> Make_TSS_Name
(Tag_Typ
, Name
),
7822 Profile
=> Build_Stream_Attr_Profile
(Loc
, Tag_Typ
, Name
),
7823 Ret_Type
=> Ret_Type
,
7824 For_Body
=> For_Body
);
7825 end Predef_Stream_Attr_Spec
;
7827 ---------------------------------
7828 -- Predefined_Primitive_Bodies --
7829 ---------------------------------
7831 function Predefined_Primitive_Bodies
7832 (Tag_Typ
: Entity_Id
;
7833 Renamed_Eq
: Entity_Id
) return List_Id
7835 Loc
: constant Source_Ptr
:= Sloc
(Tag_Typ
);
7836 Res
: constant List_Id
:= New_List
;
7839 Eq_Needed
: Boolean;
7843 pragma Warnings
(Off
, Ent
);
7846 pragma Assert
(not Is_Interface
(Tag_Typ
));
7848 -- See if we have a predefined "=" operator
7850 if Present
(Renamed_Eq
) then
7852 Eq_Name
:= Chars
(Renamed_Eq
);
7854 -- If the parent is an interface type then it has defined all the
7855 -- predefined primitives abstract and we need to check if the type
7856 -- has some user defined "=" function to avoid generating it.
7858 elsif Is_Interface
(Etype
(Tag_Typ
)) then
7860 Eq_Name
:= Name_Op_Eq
;
7862 Prim
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
7863 while Present
(Prim
) loop
7864 if Chars
(Node
(Prim
)) = Name_Op_Eq
7865 and then not Is_Internal
(Node
(Prim
))
7879 Prim
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
7880 while Present
(Prim
) loop
7881 if Chars
(Node
(Prim
)) = Name_Op_Eq
7882 and then Is_Internal
(Node
(Prim
))
7885 Eq_Name
:= Name_Op_Eq
;
7893 -- Body of _Alignment
7895 Decl
:= Predef_Spec_Or_Body
(Loc
,
7897 Name
=> Name_uAlignment
,
7898 Profile
=> New_List
(
7899 Make_Parameter_Specification
(Loc
,
7900 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_X
),
7901 Parameter_Type
=> New_Reference_To
(Tag_Typ
, Loc
))),
7903 Ret_Type
=> Standard_Integer
,
7906 Set_Handled_Statement_Sequence
(Decl
,
7907 Make_Handled_Sequence_Of_Statements
(Loc
, New_List
(
7908 Make_Simple_Return_Statement
(Loc
,
7910 Make_Attribute_Reference
(Loc
,
7911 Prefix
=> Make_Identifier
(Loc
, Name_X
),
7912 Attribute_Name
=> Name_Alignment
)))));
7914 Append_To
(Res
, Decl
);
7918 Decl
:= Predef_Spec_Or_Body
(Loc
,
7921 Profile
=> New_List
(
7922 Make_Parameter_Specification
(Loc
,
7923 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_X
),
7924 Parameter_Type
=> New_Reference_To
(Tag_Typ
, Loc
))),
7926 Ret_Type
=> Standard_Long_Long_Integer
,
7929 Set_Handled_Statement_Sequence
(Decl
,
7930 Make_Handled_Sequence_Of_Statements
(Loc
, New_List
(
7931 Make_Simple_Return_Statement
(Loc
,
7933 Make_Attribute_Reference
(Loc
,
7934 Prefix
=> Make_Identifier
(Loc
, Name_X
),
7935 Attribute_Name
=> Name_Size
)))));
7937 Append_To
(Res
, Decl
);
7939 -- Bodies for Dispatching stream IO routines. We need these only for
7940 -- non-limited types (in the limited case there is no dispatching).
7941 -- We also skip them if dispatching or finalization are not available.
7943 if Stream_Operation_OK
(Tag_Typ
, TSS_Stream_Read
)
7944 and then No
(TSS
(Tag_Typ
, TSS_Stream_Read
))
7946 Build_Record_Read_Procedure
(Loc
, Tag_Typ
, Decl
, Ent
);
7947 Append_To
(Res
, Decl
);
7950 if Stream_Operation_OK
(Tag_Typ
, TSS_Stream_Write
)
7951 and then No
(TSS
(Tag_Typ
, TSS_Stream_Write
))
7953 Build_Record_Write_Procedure
(Loc
, Tag_Typ
, Decl
, Ent
);
7954 Append_To
(Res
, Decl
);
7957 -- Skip body of _Input for the abstract case, since the corresponding
7958 -- spec is abstract (see Predef_Spec_Or_Body).
7960 if not Is_Abstract_Type
(Tag_Typ
)
7961 and then Stream_Operation_OK
(Tag_Typ
, TSS_Stream_Input
)
7962 and then No
(TSS
(Tag_Typ
, TSS_Stream_Input
))
7964 Build_Record_Or_Elementary_Input_Function
7965 (Loc
, Tag_Typ
, Decl
, Ent
);
7966 Append_To
(Res
, Decl
);
7969 if Stream_Operation_OK
(Tag_Typ
, TSS_Stream_Output
)
7970 and then No
(TSS
(Tag_Typ
, TSS_Stream_Output
))
7972 Build_Record_Or_Elementary_Output_Procedure
7973 (Loc
, Tag_Typ
, Decl
, Ent
);
7974 Append_To
(Res
, Decl
);
7977 -- Ada 2005: Generate bodies for the following primitive operations for
7978 -- limited interfaces and synchronized types that implement a limited
7981 -- disp_asynchronous_select
7982 -- disp_conditional_select
7983 -- disp_get_prim_op_kind
7985 -- disp_timed_select
7987 -- The interface versions will have null bodies
7989 -- These operations cannot be implemented on VM targets, so we simply
7990 -- disable their generation in this case. We also disable generation
7991 -- of these bodies if No_Dispatching_Calls is active.
7993 if Ada_Version
>= Ada_05
7994 and then VM_Target
= No_VM
7995 and then not Restriction_Active
(No_Dispatching_Calls
)
7996 and then not Is_Interface
(Tag_Typ
)
7998 ((Is_Interface
(Etype
(Tag_Typ
))
7999 and then Is_Limited_Record
(Etype
(Tag_Typ
)))
8000 or else (Is_Concurrent_Record_Type
(Tag_Typ
)
8001 and then Has_Abstract_Interfaces
(Tag_Typ
)))
8003 Append_To
(Res
, Make_Disp_Asynchronous_Select_Body
(Tag_Typ
));
8004 Append_To
(Res
, Make_Disp_Conditional_Select_Body
(Tag_Typ
));
8005 Append_To
(Res
, Make_Disp_Get_Prim_Op_Kind_Body
(Tag_Typ
));
8006 Append_To
(Res
, Make_Disp_Get_Task_Id_Body
(Tag_Typ
));
8007 Append_To
(Res
, Make_Disp_Requeue_Body
(Tag_Typ
));
8008 Append_To
(Res
, Make_Disp_Timed_Select_Body
(Tag_Typ
));
8011 if not Is_Limited_Type
(Tag_Typ
)
8012 and then not Is_Interface
(Tag_Typ
)
8014 -- Body for equality
8018 Predef_Spec_Or_Body
(Loc
,
8021 Profile
=> New_List
(
8022 Make_Parameter_Specification
(Loc
,
8023 Defining_Identifier
=>
8024 Make_Defining_Identifier
(Loc
, Name_X
),
8025 Parameter_Type
=> New_Reference_To
(Tag_Typ
, Loc
)),
8027 Make_Parameter_Specification
(Loc
,
8028 Defining_Identifier
=>
8029 Make_Defining_Identifier
(Loc
, Name_Y
),
8030 Parameter_Type
=> New_Reference_To
(Tag_Typ
, Loc
))),
8032 Ret_Type
=> Standard_Boolean
,
8036 Def
: constant Node_Id
:= Parent
(Tag_Typ
);
8037 Stmts
: constant List_Id
:= New_List
;
8038 Variant_Case
: Boolean := Has_Discriminants
(Tag_Typ
);
8039 Comps
: Node_Id
:= Empty
;
8040 Typ_Def
: Node_Id
:= Type_Definition
(Def
);
8043 if Variant_Case
then
8044 if Nkind
(Typ_Def
) = N_Derived_Type_Definition
then
8045 Typ_Def
:= Record_Extension_Part
(Typ_Def
);
8048 if Present
(Typ_Def
) then
8049 Comps
:= Component_List
(Typ_Def
);
8052 Variant_Case
:= Present
(Comps
)
8053 and then Present
(Variant_Part
(Comps
));
8056 if Variant_Case
then
8058 Make_Eq_If
(Tag_Typ
, Discriminant_Specifications
(Def
)));
8059 Append_List_To
(Stmts
, Make_Eq_Case
(Tag_Typ
, Comps
));
8061 Make_Simple_Return_Statement
(Loc
,
8062 Expression
=> New_Reference_To
(Standard_True
, Loc
)));
8066 Make_Simple_Return_Statement
(Loc
,
8068 Expand_Record_Equality
(Tag_Typ
,
8070 Lhs
=> Make_Identifier
(Loc
, Name_X
),
8071 Rhs
=> Make_Identifier
(Loc
, Name_Y
),
8072 Bodies
=> Declarations
(Decl
))));
8075 Set_Handled_Statement_Sequence
(Decl
,
8076 Make_Handled_Sequence_Of_Statements
(Loc
, Stmts
));
8078 Append_To
(Res
, Decl
);
8081 -- Body for dispatching assignment
8084 Predef_Spec_Or_Body
(Loc
,
8086 Name
=> Name_uAssign
,
8087 Profile
=> New_List
(
8088 Make_Parameter_Specification
(Loc
,
8089 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_X
),
8090 Out_Present
=> True,
8091 Parameter_Type
=> New_Reference_To
(Tag_Typ
, Loc
)),
8093 Make_Parameter_Specification
(Loc
,
8094 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_Y
),
8095 Parameter_Type
=> New_Reference_To
(Tag_Typ
, Loc
))),
8098 Set_Handled_Statement_Sequence
(Decl
,
8099 Make_Handled_Sequence_Of_Statements
(Loc
, New_List
(
8100 Make_Assignment_Statement
(Loc
,
8101 Name
=> Make_Identifier
(Loc
, Name_X
),
8102 Expression
=> Make_Identifier
(Loc
, Name_Y
)))));
8104 Append_To
(Res
, Decl
);
8107 -- Generate dummy bodies for finalization actions of types that have
8108 -- no controlled components.
8110 -- Skip this processing if we are in the finalization routine in the
8111 -- runtime itself, otherwise we get hopelessly circularly confused!
8113 if In_Finalization_Root
(Tag_Typ
) then
8116 -- Skip this if finalization is not available
8118 elsif Restriction_Active
(No_Finalization
) then
8121 elsif (Etype
(Tag_Typ
) = Tag_Typ
8122 or else Is_Controlled
(Tag_Typ
)
8124 -- Ada 2005 (AI-251): We must also generate these subprograms
8125 -- if the immediate ancestor of Tag_Typ is an interface to
8126 -- ensure the correct initialization of its dispatch table.
8128 or else (not Is_Interface
(Tag_Typ
)
8130 Is_Interface
(Etype
(Tag_Typ
))))
8131 and then not Has_Controlled_Component
(Tag_Typ
)
8133 if not Is_Limited_Type
(Tag_Typ
) then
8134 Decl
:= Predef_Deep_Spec
(Loc
, Tag_Typ
, TSS_Deep_Adjust
, True);
8136 if Is_Controlled
(Tag_Typ
) then
8137 Set_Handled_Statement_Sequence
(Decl
,
8138 Make_Handled_Sequence_Of_Statements
(Loc
,
8140 Ref
=> Make_Identifier
(Loc
, Name_V
),
8142 Flist_Ref
=> Make_Identifier
(Loc
, Name_L
),
8143 With_Attach
=> Make_Identifier
(Loc
, Name_B
))));
8146 Set_Handled_Statement_Sequence
(Decl
,
8147 Make_Handled_Sequence_Of_Statements
(Loc
, New_List
(
8148 Make_Null_Statement
(Loc
))));
8151 Append_To
(Res
, Decl
);
8154 Decl
:= Predef_Deep_Spec
(Loc
, Tag_Typ
, TSS_Deep_Finalize
, True);
8156 if Is_Controlled
(Tag_Typ
) then
8157 Set_Handled_Statement_Sequence
(Decl
,
8158 Make_Handled_Sequence_Of_Statements
(Loc
,
8160 Ref
=> Make_Identifier
(Loc
, Name_V
),
8162 With_Detach
=> Make_Identifier
(Loc
, Name_B
))));
8165 Set_Handled_Statement_Sequence
(Decl
,
8166 Make_Handled_Sequence_Of_Statements
(Loc
, New_List
(
8167 Make_Null_Statement
(Loc
))));
8170 Append_To
(Res
, Decl
);
8174 end Predefined_Primitive_Bodies
;
8176 ---------------------------------
8177 -- Predefined_Primitive_Freeze --
8178 ---------------------------------
8180 function Predefined_Primitive_Freeze
8181 (Tag_Typ
: Entity_Id
) return List_Id
8183 Loc
: constant Source_Ptr
:= Sloc
(Tag_Typ
);
8184 Res
: constant List_Id
:= New_List
;
8189 Prim
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
8190 while Present
(Prim
) loop
8191 if Is_Predefined_Dispatching_Operation
(Node
(Prim
)) then
8192 Frnodes
:= Freeze_Entity
(Node
(Prim
), Loc
);
8194 if Present
(Frnodes
) then
8195 Append_List_To
(Res
, Frnodes
);
8203 end Predefined_Primitive_Freeze
;
8205 -------------------------
8206 -- Stream_Operation_OK --
8207 -------------------------
8209 function Stream_Operation_OK
8211 Operation
: TSS_Name_Type
) return Boolean
8213 Has_Predefined_Or_Specified_Stream_Attribute
: Boolean := False;
8216 -- Special case of a limited type extension: a default implementation
8217 -- of the stream attributes Read or Write exists if that attribute
8218 -- has been specified or is available for an ancestor type; a default
8219 -- implementation of the attribute Output (resp. Input) exists if the
8220 -- attribute has been specified or Write (resp. Read) is available for
8221 -- an ancestor type. The last condition only applies under Ada 2005.
8223 if Is_Limited_Type
(Typ
)
8224 and then Is_Tagged_Type
(Typ
)
8226 if Operation
= TSS_Stream_Read
then
8227 Has_Predefined_Or_Specified_Stream_Attribute
:=
8228 Has_Specified_Stream_Read
(Typ
);
8230 elsif Operation
= TSS_Stream_Write
then
8231 Has_Predefined_Or_Specified_Stream_Attribute
:=
8232 Has_Specified_Stream_Write
(Typ
);
8234 elsif Operation
= TSS_Stream_Input
then
8235 Has_Predefined_Or_Specified_Stream_Attribute
:=
8236 Has_Specified_Stream_Input
(Typ
)
8238 (Ada_Version
>= Ada_05
8239 and then Stream_Operation_OK
(Typ
, TSS_Stream_Read
));
8241 elsif Operation
= TSS_Stream_Output
then
8242 Has_Predefined_Or_Specified_Stream_Attribute
:=
8243 Has_Specified_Stream_Output
(Typ
)
8245 (Ada_Version
>= Ada_05
8246 and then Stream_Operation_OK
(Typ
, TSS_Stream_Write
));
8249 -- Case of inherited TSS_Stream_Read or TSS_Stream_Write
8251 if not Has_Predefined_Or_Specified_Stream_Attribute
8252 and then Is_Derived_Type
(Typ
)
8253 and then (Operation
= TSS_Stream_Read
8254 or else Operation
= TSS_Stream_Write
)
8256 Has_Predefined_Or_Specified_Stream_Attribute
:=
8258 (Find_Inherited_TSS
(Base_Type
(Etype
(Typ
)), Operation
));
8262 -- If the type is not limited, or else is limited but the attribute is
8263 -- explicitly specified or is predefined for the type, then return True,
8264 -- unless other conditions prevail, such as restrictions prohibiting
8265 -- streams or dispatching operations.
8267 -- We exclude the Input operation from being a predefined subprogram in
8268 -- the case where the associated type is an abstract extension, because
8269 -- the attribute is not callable in that case, per 13.13.2(49/2). Also,
8270 -- we don't want an abstract version created because types derived from
8271 -- the abstract type may not even have Input available (for example if
8272 -- derived from a private view of the abstract type that doesn't have
8273 -- a visible Input), but a VM such as .NET or the Java VM can treat the
8274 -- operation as inherited anyway, and we don't want an abstract function
8275 -- to be (implicitly) inherited in that case because it can lead to a VM
8278 return (not Is_Limited_Type
(Typ
)
8279 or else Has_Predefined_Or_Specified_Stream_Attribute
)
8280 and then (Operation
/= TSS_Stream_Input
8281 or else not Is_Abstract_Type
(Typ
)
8282 or else not Is_Derived_Type
(Typ
))
8283 and then not Has_Unknown_Discriminants
(Typ
)
8284 and then not (Is_Interface
(Typ
)
8285 and then (Is_Task_Interface
(Typ
)
8286 or else Is_Protected_Interface
(Typ
)
8287 or else Is_Synchronized_Interface
(Typ
)))
8288 and then not Restriction_Active
(No_Streams
)
8289 and then not Restriction_Active
(No_Dispatch
)
8290 and then not No_Run_Time_Mode
8291 and then RTE_Available
(RE_Tag
)
8292 and then RTE_Available
(RE_Root_Stream_Type
);
8293 end Stream_Operation_OK
;