1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2016, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Aspects
; use Aspects
;
27 with Atree
; use Atree
;
28 with Checks
; use Checks
;
29 with Einfo
; use Einfo
;
30 with Errout
; use Errout
;
31 with Exp_Aggr
; use Exp_Aggr
;
32 with Exp_Atag
; use Exp_Atag
;
33 with Exp_Ch4
; use Exp_Ch4
;
34 with Exp_Ch6
; use Exp_Ch6
;
35 with Exp_Ch7
; use Exp_Ch7
;
36 with Exp_Ch9
; use Exp_Ch9
;
37 with Exp_Ch11
; use Exp_Ch11
;
38 with Exp_Dbug
; use Exp_Dbug
;
39 with Exp_Disp
; use Exp_Disp
;
40 with Exp_Dist
; use Exp_Dist
;
41 with Exp_Smem
; use Exp_Smem
;
42 with Exp_Strm
; use Exp_Strm
;
43 with Exp_Tss
; use Exp_Tss
;
44 with Exp_Util
; use Exp_Util
;
45 with Freeze
; use Freeze
;
46 with Ghost
; use Ghost
;
47 with Inline
; use Inline
;
48 with Namet
; use Namet
;
49 with Nlists
; use Nlists
;
50 with Nmake
; use Nmake
;
52 with Restrict
; use Restrict
;
53 with Rident
; use Rident
;
54 with Rtsfind
; use Rtsfind
;
56 with Sem_Aux
; use Sem_Aux
;
57 with Sem_Attr
; use Sem_Attr
;
58 with Sem_Cat
; use Sem_Cat
;
59 with Sem_Ch3
; use Sem_Ch3
;
60 with Sem_Ch6
; use Sem_Ch6
;
61 with Sem_Ch8
; use Sem_Ch8
;
62 with Sem_Ch13
; use Sem_Ch13
;
63 with Sem_Disp
; use Sem_Disp
;
64 with Sem_Eval
; use Sem_Eval
;
65 with Sem_Mech
; use Sem_Mech
;
66 with Sem_Res
; use Sem_Res
;
67 with Sem_SCIL
; use Sem_SCIL
;
68 with Sem_Type
; use Sem_Type
;
69 with Sem_Util
; use Sem_Util
;
70 with Sinfo
; use Sinfo
;
71 with Stand
; use Stand
;
72 with Snames
; use Snames
;
73 with Targparm
; use Targparm
;
74 with Tbuild
; use Tbuild
;
75 with Ttypes
; use Ttypes
;
76 with Validsw
; use Validsw
;
78 package body Exp_Ch3
is
80 -----------------------
81 -- Local Subprograms --
82 -----------------------
84 procedure Adjust_Discriminants
(Rtype
: Entity_Id
);
85 -- This is used when freezing a record type. It attempts to construct
86 -- more restrictive subtypes for discriminants so that the max size of
87 -- the record can be calculated more accurately. See the body of this
88 -- procedure for details.
90 procedure Build_Array_Init_Proc
(A_Type
: Entity_Id
; Nod
: Node_Id
);
91 -- Build initialization procedure for given array type. Nod is a node
92 -- used for attachment of any actions required in its construction.
93 -- It also supplies the source location used for the procedure.
95 function Build_Array_Invariant_Proc
97 Nod
: Node_Id
) return Node_Id
;
98 -- If the component of type of array type has invariants, build procedure
99 -- that checks invariant on all components of the array. Ada 2012 specifies
100 -- that an invariant on some type T must be applied to in-out parameters
101 -- and return values that include a part of type T. If the array type has
102 -- an otherwise specified invariant, the component check procedure is
103 -- called from within the user-specified invariant. Otherwise this becomes
104 -- the invariant procedure for the array type.
106 function Build_Record_Invariant_Proc
108 Nod
: Node_Id
) return Node_Id
;
109 -- Ditto for record types.
111 function Build_Discriminant_Formals
113 Use_Dl
: Boolean) return List_Id
;
114 -- This function uses the discriminants of a type to build a list of
115 -- formal parameters, used in Build_Init_Procedure among other places.
116 -- If the flag Use_Dl is set, the list is built using the already
117 -- defined discriminals of the type, as is the case for concurrent
118 -- types with discriminants. Otherwise new identifiers are created,
119 -- with the source names of the discriminants.
121 function Build_Equivalent_Array_Aggregate
(T
: Entity_Id
) return Node_Id
;
122 -- This function builds a static aggregate that can serve as the initial
123 -- value for an array type whose bounds are static, and whose component
124 -- type is a composite type that has a static equivalent aggregate.
125 -- The equivalent array aggregate is used both for object initialization
126 -- and for component initialization, when used in the following function.
128 function Build_Equivalent_Record_Aggregate
(T
: Entity_Id
) return Node_Id
;
129 -- This function builds a static aggregate that can serve as the initial
130 -- value for a record type whose components are scalar and initialized
131 -- with compile-time values, or arrays with similar initialization or
132 -- defaults. When possible, initialization of an object of the type can
133 -- be achieved by using a copy of the aggregate as an initial value, thus
134 -- removing the implicit call that would otherwise constitute elaboration
137 procedure Build_Record_Init_Proc
(N
: Node_Id
; Rec_Ent
: Entity_Id
);
138 -- Build record initialization procedure. N is the type declaration
139 -- node, and Rec_Ent is the corresponding entity for the record type.
141 procedure Build_Slice_Assignment
(Typ
: Entity_Id
);
142 -- Build assignment procedure for one-dimensional arrays of controlled
143 -- types. Other array and slice assignments are expanded in-line, but
144 -- the code expansion for controlled components (when control actions
145 -- are active) can lead to very large blocks that GCC3 handles poorly.
147 procedure Build_Untagged_Equality
(Typ
: Entity_Id
);
148 -- AI05-0123: Equality on untagged records composes. This procedure
149 -- builds the equality routine for an untagged record that has components
150 -- of a record type that has user-defined primitive equality operations.
151 -- The resulting operation is a TSS subprogram.
153 procedure Build_Variant_Record_Equality
(Typ
: Entity_Id
);
154 -- Create An Equality function for the untagged variant record Typ and
155 -- attach it to the TSS list
157 procedure Check_Stream_Attributes
(Typ
: Entity_Id
);
158 -- Check that if a limited extension has a parent with user-defined stream
159 -- attributes, and does not itself have user-defined stream-attributes,
160 -- then any limited component of the extension also has the corresponding
161 -- user-defined stream attributes.
163 procedure Clean_Task_Names
165 Proc_Id
: Entity_Id
);
166 -- If an initialization procedure includes calls to generate names
167 -- for task subcomponents, indicate that secondary stack cleanup is
168 -- needed after an initialization. Typ is the component type, and Proc_Id
169 -- the initialization procedure for the enclosing composite type.
171 procedure Expand_Freeze_Array_Type
(N
: Node_Id
);
172 -- Freeze an array type. Deals with building the initialization procedure,
173 -- creating the packed array type for a packed array and also with the
174 -- creation of the controlling procedures for the controlled case. The
175 -- argument N is the N_Freeze_Entity node for the type.
177 procedure Expand_Freeze_Class_Wide_Type
(N
: Node_Id
);
178 -- Freeze a class-wide type. Build routine Finalize_Address for the purpose
179 -- of finalizing controlled derivations from the class-wide's root type.
181 procedure Expand_Freeze_Enumeration_Type
(N
: Node_Id
);
182 -- Freeze enumeration type with non-standard representation. Builds the
183 -- array and function needed to convert between enumeration pos and
184 -- enumeration representation values. N is the N_Freeze_Entity node
187 procedure Expand_Freeze_Record_Type
(N
: Node_Id
);
188 -- Freeze record type. Builds all necessary discriminant checking
189 -- and other ancillary functions, and builds dispatch tables where
190 -- needed. The argument N is the N_Freeze_Entity node. This processing
191 -- applies only to E_Record_Type entities, not to class wide types,
192 -- record subtypes, or private types.
194 procedure Expand_Tagged_Root
(T
: Entity_Id
);
195 -- Add a field _Tag at the beginning of the record. This field carries
196 -- the value of the access to the Dispatch table. This procedure is only
197 -- called on root type, the _Tag field being inherited by the descendants.
199 procedure Freeze_Stream_Operations
(N
: Node_Id
; Typ
: Entity_Id
);
200 -- Treat user-defined stream operations as renaming_as_body if the
201 -- subprogram they rename is not frozen when the type is frozen.
203 procedure Insert_Component_Invariant_Checks
207 -- If a composite type has invariants and also has components with defined
208 -- invariants. the component invariant procedure is inserted into the user-
209 -- defined invariant procedure and added to the checks to be performed.
211 procedure Initialization_Warning
(E
: Entity_Id
);
212 -- If static elaboration of the package is requested, indicate
213 -- when a type does meet the conditions for static initialization. If
214 -- E is a type, it has components that have no static initialization.
215 -- if E is an entity, its initial expression is not compile-time known.
217 function Init_Formals
(Typ
: Entity_Id
) return List_Id
;
218 -- This function builds the list of formals for an initialization routine.
219 -- The first formal is always _Init with the given type. For task value
220 -- record types and types containing tasks, three additional formals are
223 -- _Master : Master_Id
224 -- _Chain : in out Activation_Chain
225 -- _Task_Name : String
227 -- The caller must append additional entries for discriminants if required.
229 function Inline_Init_Proc
(Typ
: Entity_Id
) return Boolean;
230 -- Returns true if the initialization procedure of Typ should be inlined
232 function In_Runtime
(E
: Entity_Id
) return Boolean;
233 -- Check if E is defined in the RTL (in a child of Ada or System). Used
234 -- to avoid to bring in the overhead of _Input, _Output for tagged types.
236 function Is_User_Defined_Equality
(Prim
: Node_Id
) return Boolean;
237 -- Returns true if Prim is a user defined equality function
239 function Make_Eq_Body
241 Eq_Name
: Name_Id
) return Node_Id
;
242 -- Build the body of a primitive equality operation for a tagged record
243 -- type, or in Ada 2012 for any record type that has components with a
244 -- user-defined equality. Factored out of Predefined_Primitive_Bodies.
246 function Make_Eq_Case
249 Discrs
: Elist_Id
:= New_Elmt_List
) return List_Id
;
250 -- Building block for variant record equality. Defined to share the code
251 -- between the tagged and untagged case. Given a Component_List node CL,
252 -- it generates an 'if' followed by a 'case' statement that compares all
253 -- components of local temporaries named X and Y (that are declared as
254 -- formals at some upper level). E provides the Sloc to be used for the
257 -- IF E is an unchecked_union, Discrs is the list of formals created for
258 -- the inferred discriminants of one operand. These formals are used in
259 -- the generated case statements for each variant of the unchecked union.
263 L
: List_Id
) return Node_Id
;
264 -- Building block for variant record equality. Defined to share the code
265 -- between the tagged and untagged case. Given the list of components
266 -- (or discriminants) L, it generates a return statement that compares all
267 -- components of local temporaries named X and Y (that are declared as
268 -- formals at some upper level). E provides the Sloc to be used for the
271 function Make_Neq_Body
(Tag_Typ
: Entity_Id
) return Node_Id
;
272 -- Search for a renaming of the inequality dispatching primitive of
273 -- this tagged type. If found then build and return the corresponding
274 -- rename-as-body inequality subprogram; otherwise return Empty.
276 procedure Make_Predefined_Primitive_Specs
277 (Tag_Typ
: Entity_Id
;
278 Predef_List
: out List_Id
;
279 Renamed_Eq
: out Entity_Id
);
280 -- Create a list with the specs of the predefined primitive operations.
281 -- For tagged types that are interfaces all these primitives are defined
284 -- The following entries are present for all tagged types, and provide
285 -- the results of the corresponding attribute applied to the object.
286 -- Dispatching is required in general, since the result of the attribute
287 -- will vary with the actual object subtype.
289 -- _size provides result of 'Size attribute
290 -- typSR provides result of 'Read attribute
291 -- typSW provides result of 'Write attribute
292 -- typSI provides result of 'Input attribute
293 -- typSO provides result of 'Output attribute
295 -- The following entries are additionally present for non-limited tagged
296 -- types, and implement additional dispatching operations for predefined
299 -- _equality implements "=" operator
300 -- _assign implements assignment operation
301 -- typDF implements deep finalization
302 -- typDA implements deep adjust
304 -- The latter two are empty procedures unless the type contains some
305 -- controlled components that require finalization actions (the deep
306 -- in the name refers to the fact that the action applies to components).
308 -- The list is returned in Predef_List. The Parameter Renamed_Eq either
309 -- returns the value Empty, or else the defining unit name for the
310 -- predefined equality function in the case where the type has a primitive
311 -- operation that is a renaming of predefined equality (but only if there
312 -- is also an overriding user-defined equality function). The returned
313 -- Renamed_Eq will be passed to the corresponding parameter of
314 -- Predefined_Primitive_Bodies.
316 function Has_New_Non_Standard_Rep
(T
: Entity_Id
) return Boolean;
317 -- Returns True if there are representation clauses for type T that are not
318 -- inherited. If the result is false, the init_proc and the discriminant
319 -- checking functions of the parent can be reused by a derived type.
321 procedure Make_Controlling_Function_Wrappers
322 (Tag_Typ
: Entity_Id
;
323 Decl_List
: out List_Id
;
324 Body_List
: out List_Id
);
325 -- Ada 2005 (AI-391): Makes specs and bodies for the wrapper functions
326 -- associated with inherited functions with controlling results which
327 -- are not overridden. The body of each wrapper function consists solely
328 -- of a return statement whose expression is an extension aggregate
329 -- invoking the inherited subprogram's parent subprogram and extended
330 -- with a null association list.
332 function Make_Null_Procedure_Specs
(Tag_Typ
: Entity_Id
) return List_Id
;
333 -- Ada 2005 (AI-251): Makes specs for null procedures associated with any
334 -- null procedures inherited from an interface type that have not been
335 -- overridden. Only one null procedure will be created for a given set of
336 -- inherited null procedures with homographic profiles.
338 function Predef_Spec_Or_Body
343 Ret_Type
: Entity_Id
:= Empty
;
344 For_Body
: Boolean := False) return Node_Id
;
345 -- This function generates the appropriate expansion for a predefined
346 -- primitive operation specified by its name, parameter profile and
347 -- return type (Empty means this is a procedure). If For_Body is false,
348 -- then the returned node is a subprogram declaration. If For_Body is
349 -- true, then the returned node is a empty subprogram body containing
350 -- no declarations and no statements.
352 function Predef_Stream_Attr_Spec
355 Name
: TSS_Name_Type
;
356 For_Body
: Boolean := False) return Node_Id
;
357 -- Specialized version of Predef_Spec_Or_Body that apply to read, write,
358 -- input and output attribute whose specs are constructed in Exp_Strm.
360 function Predef_Deep_Spec
363 Name
: TSS_Name_Type
;
364 For_Body
: Boolean := False) return Node_Id
;
365 -- Specialized version of Predef_Spec_Or_Body that apply to _deep_adjust
366 -- and _deep_finalize
368 function Predefined_Primitive_Bodies
369 (Tag_Typ
: Entity_Id
;
370 Renamed_Eq
: Entity_Id
) return List_Id
;
371 -- Create the bodies of the predefined primitives that are described in
372 -- Predefined_Primitive_Specs. When not empty, Renamed_Eq must denote
373 -- the defining unit name of the type's predefined equality as returned
374 -- by Make_Predefined_Primitive_Specs.
376 function Predefined_Primitive_Freeze
(Tag_Typ
: Entity_Id
) return List_Id
;
377 -- Freeze entities of all predefined primitive operations. This is needed
378 -- because the bodies of these operations do not normally do any freezing.
380 function Stream_Operation_OK
382 Operation
: TSS_Name_Type
) return Boolean;
383 -- Check whether the named stream operation must be emitted for a given
384 -- type. The rules for inheritance of stream attributes by type extensions
385 -- are enforced by this function. Furthermore, various restrictions prevent
386 -- the generation of these operations, as a useful optimization or for
387 -- certification purposes and to save unnecessary generated code.
389 --------------------------
390 -- Adjust_Discriminants --
391 --------------------------
393 -- This procedure attempts to define subtypes for discriminants that are
394 -- more restrictive than those declared. Such a replacement is possible if
395 -- we can demonstrate that values outside the restricted range would cause
396 -- constraint errors in any case. The advantage of restricting the
397 -- discriminant types in this way is that the maximum size of the variant
398 -- record can be calculated more conservatively.
400 -- An example of a situation in which we can perform this type of
401 -- restriction is the following:
403 -- subtype B is range 1 .. 10;
404 -- type Q is array (B range <>) of Integer;
406 -- type V (N : Natural) is record
410 -- In this situation, we can restrict the upper bound of N to 10, since
411 -- any larger value would cause a constraint error in any case.
413 -- There are many situations in which such restriction is possible, but
414 -- for now, we just look for cases like the above, where the component
415 -- in question is a one dimensional array whose upper bound is one of
416 -- the record discriminants. Also the component must not be part of
417 -- any variant part, since then the component does not always exist.
419 procedure Adjust_Discriminants
(Rtype
: Entity_Id
) is
420 Loc
: constant Source_Ptr
:= Sloc
(Rtype
);
437 Comp
:= First_Component
(Rtype
);
438 while Present
(Comp
) loop
440 -- If our parent is a variant, quit, we do not look at components
441 -- that are in variant parts, because they may not always exist.
443 P
:= Parent
(Comp
); -- component declaration
444 P
:= Parent
(P
); -- component list
446 exit when Nkind
(Parent
(P
)) = N_Variant
;
448 -- We are looking for a one dimensional array type
450 Ctyp
:= Etype
(Comp
);
452 if not Is_Array_Type
(Ctyp
) or else Number_Dimensions
(Ctyp
) > 1 then
456 -- The lower bound must be constant, and the upper bound is a
457 -- discriminant (which is a discriminant of the current record).
459 Ityp
:= Etype
(First_Index
(Ctyp
));
460 Lo
:= Type_Low_Bound
(Ityp
);
461 Hi
:= Type_High_Bound
(Ityp
);
463 if not Compile_Time_Known_Value
(Lo
)
464 or else Nkind
(Hi
) /= N_Identifier
465 or else No
(Entity
(Hi
))
466 or else Ekind
(Entity
(Hi
)) /= E_Discriminant
471 -- We have an array with appropriate bounds
473 Loval
:= Expr_Value
(Lo
);
474 Discr
:= Entity
(Hi
);
475 Dtyp
:= Etype
(Discr
);
477 -- See if the discriminant has a known upper bound
479 Dhi
:= Type_High_Bound
(Dtyp
);
481 if not Compile_Time_Known_Value
(Dhi
) then
485 Dhiv
:= Expr_Value
(Dhi
);
487 -- See if base type of component array has known upper bound
489 Ahi
:= Type_High_Bound
(Etype
(First_Index
(Base_Type
(Ctyp
))));
491 if not Compile_Time_Known_Value
(Ahi
) then
495 Ahiv
:= Expr_Value
(Ahi
);
497 -- The condition for doing the restriction is that the high bound
498 -- of the discriminant is greater than the low bound of the array,
499 -- and is also greater than the high bound of the base type index.
501 if Dhiv
> Loval
and then Dhiv
> Ahiv
then
503 -- We can reset the upper bound of the discriminant type to
504 -- whichever is larger, the low bound of the component, or
505 -- the high bound of the base type array index.
507 -- We build a subtype that is declared as
509 -- subtype Tnn is discr_type range discr_type'First .. max;
511 -- And insert this declaration into the tree. The type of the
512 -- discriminant is then reset to this more restricted subtype.
514 Tnn
:= Make_Temporary
(Loc
, 'T');
516 Insert_Action
(Declaration_Node
(Rtype
),
517 Make_Subtype_Declaration
(Loc
,
518 Defining_Identifier
=> Tnn
,
519 Subtype_Indication
=>
520 Make_Subtype_Indication
(Loc
,
521 Subtype_Mark
=> New_Occurrence_Of
(Dtyp
, Loc
),
523 Make_Range_Constraint
(Loc
,
527 Make_Attribute_Reference
(Loc
,
528 Attribute_Name
=> Name_First
,
529 Prefix
=> New_Occurrence_Of
(Dtyp
, Loc
)),
531 Make_Integer_Literal
(Loc
,
532 Intval
=> UI_Max
(Loval
, Ahiv
)))))));
534 Set_Etype
(Discr
, Tnn
);
538 Next_Component
(Comp
);
540 end Adjust_Discriminants
;
542 ---------------------------
543 -- Build_Array_Init_Proc --
544 ---------------------------
546 procedure Build_Array_Init_Proc
(A_Type
: Entity_Id
; Nod
: Node_Id
) is
547 Comp_Type
: constant Entity_Id
:= Component_Type
(A_Type
);
548 Body_Stmts
: List_Id
;
549 Has_Default_Init
: Boolean;
550 Index_List
: List_Id
;
554 function Init_Component
return List_Id
;
555 -- Create one statement to initialize one array component, designated
556 -- by a full set of indexes.
558 function Init_One_Dimension
(N
: Int
) return List_Id
;
559 -- Create loop to initialize one dimension of the array. The single
560 -- statement in the loop body initializes the inner dimensions if any,
561 -- or else the single component. Note that this procedure is called
562 -- recursively, with N being the dimension to be initialized. A call
563 -- with N greater than the number of dimensions simply generates the
564 -- component initialization, terminating the recursion.
570 function Init_Component
return List_Id
is
575 Make_Indexed_Component
(Loc
,
576 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
577 Expressions
=> Index_List
);
579 if Has_Default_Aspect
(A_Type
) then
580 Set_Assignment_OK
(Comp
);
582 Make_Assignment_Statement
(Loc
,
585 Convert_To
(Comp_Type
,
586 Default_Aspect_Component_Value
(First_Subtype
(A_Type
)))));
588 elsif Needs_Simple_Initialization
(Comp_Type
) then
589 Set_Assignment_OK
(Comp
);
591 Make_Assignment_Statement
(Loc
,
595 (Comp_Type
, Nod
, Component_Size
(A_Type
))));
598 Clean_Task_Names
(Comp_Type
, Proc_Id
);
600 Build_Initialization_Call
601 (Loc
, Comp
, Comp_Type
,
602 In_Init_Proc
=> True,
603 Enclos_Type
=> A_Type
);
607 ------------------------
608 -- Init_One_Dimension --
609 ------------------------
611 function Init_One_Dimension
(N
: Int
) return List_Id
is
615 -- If the component does not need initializing, then there is nothing
616 -- to do here, so we return a null body. This occurs when generating
617 -- the dummy Init_Proc needed for Initialize_Scalars processing.
619 if not Has_Non_Null_Base_Init_Proc
(Comp_Type
)
620 and then not Needs_Simple_Initialization
(Comp_Type
)
621 and then not Has_Task
(Comp_Type
)
622 and then not Has_Default_Aspect
(A_Type
)
624 return New_List
(Make_Null_Statement
(Loc
));
626 -- If all dimensions dealt with, we simply initialize the component
628 elsif N
> Number_Dimensions
(A_Type
) then
629 return Init_Component
;
631 -- Here we generate the required loop
635 Make_Defining_Identifier
(Loc
, New_External_Name
('J', N
));
637 Append
(New_Occurrence_Of
(Index
, Loc
), Index_List
);
640 Make_Implicit_Loop_Statement
(Nod
,
643 Make_Iteration_Scheme
(Loc
,
644 Loop_Parameter_Specification
=>
645 Make_Loop_Parameter_Specification
(Loc
,
646 Defining_Identifier
=> Index
,
647 Discrete_Subtype_Definition
=>
648 Make_Attribute_Reference
(Loc
,
650 Make_Identifier
(Loc
, Name_uInit
),
651 Attribute_Name
=> Name_Range
,
652 Expressions
=> New_List
(
653 Make_Integer_Literal
(Loc
, N
))))),
654 Statements
=> Init_One_Dimension
(N
+ 1)));
656 end Init_One_Dimension
;
658 -- Start of processing for Build_Array_Init_Proc
661 -- The init proc is created when analyzing the freeze node for the type,
662 -- but it properly belongs with the array type declaration. However, if
663 -- the freeze node is for a subtype of a type declared in another unit
664 -- it seems preferable to use the freeze node as the source location of
665 -- the init proc. In any case this is preferable for gcov usage, and
666 -- the Sloc is not otherwise used by the compiler.
668 if In_Open_Scopes
(Scope
(A_Type
)) then
669 Loc
:= Sloc
(A_Type
);
674 -- Nothing to generate in the following cases:
676 -- 1. Initialization is suppressed for the type
677 -- 2. An initialization already exists for the base type
679 if Initialization_Suppressed
(A_Type
)
680 or else Present
(Base_Init_Proc
(A_Type
))
685 Index_List
:= New_List
;
687 -- We need an initialization procedure if any of the following is true:
689 -- 1. The component type has an initialization procedure
690 -- 2. The component type needs simple initialization
691 -- 3. Tasks are present
692 -- 4. The type is marked as a public entity
693 -- 5. The array type has a Default_Component_Value aspect
695 -- The reason for the public entity test is to deal properly with the
696 -- Initialize_Scalars pragma. This pragma can be set in the client and
697 -- not in the declaring package, this means the client will make a call
698 -- to the initialization procedure (because one of conditions 1-3 must
699 -- apply in this case), and we must generate a procedure (even if it is
700 -- null) to satisfy the call in this case.
702 -- Exception: do not build an array init_proc for a type whose root
703 -- type is Standard.String or Standard.Wide_[Wide_]String, since there
704 -- is no place to put the code, and in any case we handle initialization
705 -- of such types (in the Initialize_Scalars case, that's the only time
706 -- the issue arises) in a special manner anyway which does not need an
709 Has_Default_Init
:= Has_Non_Null_Base_Init_Proc
(Comp_Type
)
710 or else Needs_Simple_Initialization
(Comp_Type
)
711 or else Has_Task
(Comp_Type
)
712 or else Has_Default_Aspect
(A_Type
);
715 or else (not Restriction_Active
(No_Initialize_Scalars
)
716 and then Is_Public
(A_Type
)
717 and then not Is_Standard_String_Type
(A_Type
))
720 Make_Defining_Identifier
(Loc
,
721 Chars
=> Make_Init_Proc_Name
(A_Type
));
723 -- If No_Default_Initialization restriction is active, then we don't
724 -- want to build an init_proc, but we need to mark that an init_proc
725 -- would be needed if this restriction was not active (so that we can
726 -- detect attempts to call it), so set a dummy init_proc in place.
727 -- This is only done though when actual default initialization is
728 -- needed (and not done when only Is_Public is True), since otherwise
729 -- objects such as arrays of scalars could be wrongly flagged as
730 -- violating the restriction.
732 if Restriction_Active
(No_Default_Initialization
) then
733 if Has_Default_Init
then
734 Set_Init_Proc
(A_Type
, Proc_Id
);
740 Body_Stmts
:= Init_One_Dimension
(1);
743 Make_Subprogram_Body
(Loc
,
745 Make_Procedure_Specification
(Loc
,
746 Defining_Unit_Name
=> Proc_Id
,
747 Parameter_Specifications
=> Init_Formals
(A_Type
)),
748 Declarations
=> New_List
,
749 Handled_Statement_Sequence
=>
750 Make_Handled_Sequence_Of_Statements
(Loc
,
751 Statements
=> Body_Stmts
)));
753 Set_Ekind
(Proc_Id
, E_Procedure
);
754 Set_Is_Public
(Proc_Id
, Is_Public
(A_Type
));
755 Set_Is_Internal
(Proc_Id
);
756 Set_Has_Completion
(Proc_Id
);
758 if not Debug_Generated_Code
then
759 Set_Debug_Info_Off
(Proc_Id
);
762 -- Set Inlined on Init_Proc if it is set on the Init_Proc of the
763 -- component type itself (see also Build_Record_Init_Proc).
765 Set_Is_Inlined
(Proc_Id
, Inline_Init_Proc
(Comp_Type
));
767 -- Associate Init_Proc with type, and determine if the procedure
768 -- is null (happens because of the Initialize_Scalars pragma case,
769 -- where we have to generate a null procedure in case it is called
770 -- by a client with Initialize_Scalars set). Such procedures have
771 -- to be generated, but do not have to be called, so we mark them
772 -- as null to suppress the call.
774 Set_Init_Proc
(A_Type
, Proc_Id
);
776 if List_Length
(Body_Stmts
) = 1
778 -- We must skip SCIL nodes because they may have been added to this
779 -- list by Insert_Actions.
781 and then Nkind
(First_Non_SCIL_Node
(Body_Stmts
)) = N_Null_Statement
783 Set_Is_Null_Init_Proc
(Proc_Id
);
786 -- Try to build a static aggregate to statically initialize
787 -- objects of the type. This can only be done for constrained
788 -- one-dimensional arrays with static bounds.
790 Set_Static_Initialization
792 Build_Equivalent_Array_Aggregate
(First_Subtype
(A_Type
)));
795 end Build_Array_Init_Proc
;
797 --------------------------------
798 -- Build_Array_Invariant_Proc --
799 --------------------------------
801 function Build_Array_Invariant_Proc
803 Nod
: Node_Id
) return Node_Id
805 Loc
: constant Source_Ptr
:= Sloc
(Nod
);
807 Object_Name
: constant Name_Id
:= New_Internal_Name
('I');
808 -- Name for argument of invariant procedure
810 Object_Entity
: constant Node_Id
:=
811 Make_Defining_Identifier
(Loc
, Object_Name
);
812 -- The procedure declaration entity for the argument
814 Body_Stmts
: List_Id
;
815 Index_List
: List_Id
;
819 function Build_Component_Invariant_Call
return Node_Id
;
820 -- Create one statement to verify invariant on one array component,
821 -- designated by a full set of indexes.
823 function Check_One_Dimension
(N
: Int
) return List_Id
;
824 -- Create loop to check on one dimension of the array. The single
825 -- statement in the loop body checks the inner dimensions if any, or
826 -- else a single component. This procedure is called recursively, with
827 -- N being the dimension to be initialized. A call with N greater than
828 -- the number of dimensions generates the component initialization
829 -- and terminates the recursion.
831 ------------------------------------
832 -- Build_Component_Invariant_Call --
833 ------------------------------------
835 function Build_Component_Invariant_Call
return Node_Id
is
839 Make_Indexed_Component
(Loc
,
840 Prefix
=> New_Occurrence_Of
(Object_Entity
, Loc
),
841 Expressions
=> Index_List
);
843 Make_Procedure_Call_Statement
(Loc
,
846 (Invariant_Procedure
(Component_Type
(A_Type
)), Loc
),
847 Parameter_Associations
=> New_List
(Comp
));
848 end Build_Component_Invariant_Call
;
850 -------------------------
851 -- Check_One_Dimension --
852 -------------------------
854 function Check_One_Dimension
(N
: Int
) return List_Id
is
858 -- If all dimensions dealt with, we simply check invariant of the
861 if N
> Number_Dimensions
(A_Type
) then
862 return New_List
(Build_Component_Invariant_Call
);
864 -- Else generate one loop and recurse
868 Make_Defining_Identifier
(Loc
, New_External_Name
('J', N
));
870 Append
(New_Occurrence_Of
(Index
, Loc
), Index_List
);
873 Make_Implicit_Loop_Statement
(Nod
,
876 Make_Iteration_Scheme
(Loc
,
877 Loop_Parameter_Specification
=>
878 Make_Loop_Parameter_Specification
(Loc
,
879 Defining_Identifier
=> Index
,
880 Discrete_Subtype_Definition
=>
881 Make_Attribute_Reference
(Loc
,
883 New_Occurrence_Of
(Object_Entity
, Loc
),
884 Attribute_Name
=> Name_Range
,
885 Expressions
=> New_List
(
886 Make_Integer_Literal
(Loc
, N
))))),
887 Statements
=> Check_One_Dimension
(N
+ 1)));
889 end Check_One_Dimension
;
891 -- Start of processing for Build_Array_Invariant_Proc
894 Index_List
:= New_List
;
897 Make_Defining_Identifier
(Loc
,
898 Chars
=> New_External_Name
(Chars
(A_Type
), "CInvariant"));
900 Body_Stmts
:= Check_One_Dimension
(1);
903 Make_Subprogram_Body
(Loc
,
905 Make_Procedure_Specification
(Loc
,
906 Defining_Unit_Name
=> Proc_Id
,
907 Parameter_Specifications
=> New_List
(
908 Make_Parameter_Specification
(Loc
,
909 Defining_Identifier
=> Object_Entity
,
910 Parameter_Type
=> New_Occurrence_Of
(A_Type
, Loc
)))),
912 Declarations
=> Empty_List
,
913 Handled_Statement_Sequence
=>
914 Make_Handled_Sequence_Of_Statements
(Loc
,
915 Statements
=> Body_Stmts
));
917 Set_Ekind
(Proc_Id
, E_Procedure
);
918 Set_Is_Public
(Proc_Id
, Is_Public
(A_Type
));
919 Set_Is_Internal
(Proc_Id
);
920 Set_Has_Completion
(Proc_Id
);
922 if not Debug_Generated_Code
then
923 Set_Debug_Info_Off
(Proc_Id
);
927 end Build_Array_Invariant_Proc
;
929 --------------------------------
930 -- Build_Discr_Checking_Funcs --
931 --------------------------------
933 procedure Build_Discr_Checking_Funcs
(N
: Node_Id
) is
936 Enclosing_Func_Id
: Entity_Id
;
941 function Build_Case_Statement
942 (Case_Id
: Entity_Id
;
943 Variant
: Node_Id
) return Node_Id
;
944 -- Build a case statement containing only two alternatives. The first
945 -- alternative corresponds exactly to the discrete choices given on the
946 -- variant with contains the components that we are generating the
947 -- checks for. If the discriminant is one of these return False. The
948 -- second alternative is an OTHERS choice that will return True
949 -- indicating the discriminant did not match.
951 function Build_Dcheck_Function
952 (Case_Id
: Entity_Id
;
953 Variant
: Node_Id
) return Entity_Id
;
954 -- Build the discriminant checking function for a given variant
956 procedure Build_Dcheck_Functions
(Variant_Part_Node
: Node_Id
);
957 -- Builds the discriminant checking function for each variant of the
958 -- given variant part of the record type.
960 --------------------------
961 -- Build_Case_Statement --
962 --------------------------
964 function Build_Case_Statement
965 (Case_Id
: Entity_Id
;
966 Variant
: Node_Id
) return Node_Id
968 Alt_List
: constant List_Id
:= New_List
;
969 Actuals_List
: List_Id
;
971 Case_Alt_Node
: Node_Id
;
973 Choice_List
: List_Id
;
975 Return_Node
: Node_Id
;
978 Case_Node
:= New_Node
(N_Case_Statement
, Loc
);
980 -- Replace the discriminant which controls the variant with the name
981 -- of the formal of the checking function.
983 Set_Expression
(Case_Node
, Make_Identifier
(Loc
, Chars
(Case_Id
)));
985 Choice
:= First
(Discrete_Choices
(Variant
));
987 if Nkind
(Choice
) = N_Others_Choice
then
988 Choice_List
:= New_Copy_List
(Others_Discrete_Choices
(Choice
));
990 Choice_List
:= New_Copy_List
(Discrete_Choices
(Variant
));
993 if not Is_Empty_List
(Choice_List
) then
994 Case_Alt_Node
:= New_Node
(N_Case_Statement_Alternative
, Loc
);
995 Set_Discrete_Choices
(Case_Alt_Node
, Choice_List
);
997 -- In case this is a nested variant, we need to return the result
998 -- of the discriminant checking function for the immediately
999 -- enclosing variant.
1001 if Present
(Enclosing_Func_Id
) then
1002 Actuals_List
:= New_List
;
1004 D
:= First_Discriminant
(Rec_Id
);
1005 while Present
(D
) loop
1006 Append
(Make_Identifier
(Loc
, Chars
(D
)), Actuals_List
);
1007 Next_Discriminant
(D
);
1011 Make_Simple_Return_Statement
(Loc
,
1013 Make_Function_Call
(Loc
,
1015 New_Occurrence_Of
(Enclosing_Func_Id
, Loc
),
1016 Parameter_Associations
=>
1021 Make_Simple_Return_Statement
(Loc
,
1023 New_Occurrence_Of
(Standard_False
, Loc
));
1026 Set_Statements
(Case_Alt_Node
, New_List
(Return_Node
));
1027 Append
(Case_Alt_Node
, Alt_List
);
1030 Case_Alt_Node
:= New_Node
(N_Case_Statement_Alternative
, Loc
);
1031 Choice_List
:= New_List
(New_Node
(N_Others_Choice
, Loc
));
1032 Set_Discrete_Choices
(Case_Alt_Node
, Choice_List
);
1035 Make_Simple_Return_Statement
(Loc
,
1037 New_Occurrence_Of
(Standard_True
, Loc
));
1039 Set_Statements
(Case_Alt_Node
, New_List
(Return_Node
));
1040 Append
(Case_Alt_Node
, Alt_List
);
1042 Set_Alternatives
(Case_Node
, Alt_List
);
1044 end Build_Case_Statement
;
1046 ---------------------------
1047 -- Build_Dcheck_Function --
1048 ---------------------------
1050 function Build_Dcheck_Function
1051 (Case_Id
: Entity_Id
;
1052 Variant
: Node_Id
) return Entity_Id
1054 Body_Node
: Node_Id
;
1055 Func_Id
: Entity_Id
;
1056 Parameter_List
: List_Id
;
1057 Spec_Node
: Node_Id
;
1060 Body_Node
:= New_Node
(N_Subprogram_Body
, Loc
);
1061 Sequence
:= Sequence
+ 1;
1064 Make_Defining_Identifier
(Loc
,
1065 Chars
=> New_External_Name
(Chars
(Rec_Id
), 'D', Sequence
));
1066 Set_Is_Discriminant_Check_Function
(Func_Id
);
1068 Spec_Node
:= New_Node
(N_Function_Specification
, Loc
);
1069 Set_Defining_Unit_Name
(Spec_Node
, Func_Id
);
1071 Parameter_List
:= Build_Discriminant_Formals
(Rec_Id
, False);
1073 Set_Parameter_Specifications
(Spec_Node
, Parameter_List
);
1074 Set_Result_Definition
(Spec_Node
,
1075 New_Occurrence_Of
(Standard_Boolean
, Loc
));
1076 Set_Specification
(Body_Node
, Spec_Node
);
1077 Set_Declarations
(Body_Node
, New_List
);
1079 Set_Handled_Statement_Sequence
(Body_Node
,
1080 Make_Handled_Sequence_Of_Statements
(Loc
,
1081 Statements
=> New_List
(
1082 Build_Case_Statement
(Case_Id
, Variant
))));
1084 Set_Ekind
(Func_Id
, E_Function
);
1085 Set_Mechanism
(Func_Id
, Default_Mechanism
);
1086 Set_Is_Inlined
(Func_Id
, True);
1087 Set_Is_Pure
(Func_Id
, True);
1088 Set_Is_Public
(Func_Id
, Is_Public
(Rec_Id
));
1089 Set_Is_Internal
(Func_Id
, True);
1091 if not Debug_Generated_Code
then
1092 Set_Debug_Info_Off
(Func_Id
);
1095 Analyze
(Body_Node
);
1097 Append_Freeze_Action
(Rec_Id
, Body_Node
);
1098 Set_Dcheck_Function
(Variant
, Func_Id
);
1100 end Build_Dcheck_Function
;
1102 ----------------------------
1103 -- Build_Dcheck_Functions --
1104 ----------------------------
1106 procedure Build_Dcheck_Functions
(Variant_Part_Node
: Node_Id
) is
1107 Component_List_Node
: Node_Id
;
1109 Discr_Name
: Entity_Id
;
1110 Func_Id
: Entity_Id
;
1112 Saved_Enclosing_Func_Id
: Entity_Id
;
1115 -- Build the discriminant-checking function for each variant, and
1116 -- label all components of that variant with the function's name.
1117 -- We only Generate a discriminant-checking function when the
1118 -- variant is not empty, to prevent the creation of dead code.
1119 -- The exception to that is when Frontend_Layout_On_Target is set,
1120 -- because the variant record size function generated in package
1121 -- Layout needs to generate calls to all discriminant-checking
1122 -- functions, including those for empty variants.
1124 Discr_Name
:= Entity
(Name
(Variant_Part_Node
));
1125 Variant
:= First_Non_Pragma
(Variants
(Variant_Part_Node
));
1127 while Present
(Variant
) loop
1128 Component_List_Node
:= Component_List
(Variant
);
1130 if not Null_Present
(Component_List_Node
)
1131 or else Frontend_Layout_On_Target
1133 Func_Id
:= Build_Dcheck_Function
(Discr_Name
, Variant
);
1136 First_Non_Pragma
(Component_Items
(Component_List_Node
));
1137 while Present
(Decl
) loop
1138 Set_Discriminant_Checking_Func
1139 (Defining_Identifier
(Decl
), Func_Id
);
1140 Next_Non_Pragma
(Decl
);
1143 if Present
(Variant_Part
(Component_List_Node
)) then
1144 Saved_Enclosing_Func_Id
:= Enclosing_Func_Id
;
1145 Enclosing_Func_Id
:= Func_Id
;
1146 Build_Dcheck_Functions
(Variant_Part
(Component_List_Node
));
1147 Enclosing_Func_Id
:= Saved_Enclosing_Func_Id
;
1151 Next_Non_Pragma
(Variant
);
1153 end Build_Dcheck_Functions
;
1155 -- Start of processing for Build_Discr_Checking_Funcs
1158 -- Only build if not done already
1160 if not Discr_Check_Funcs_Built
(N
) then
1161 Type_Def
:= Type_Definition
(N
);
1163 if Nkind
(Type_Def
) = N_Record_Definition
then
1164 if No
(Component_List
(Type_Def
)) then -- null record.
1167 V
:= Variant_Part
(Component_List
(Type_Def
));
1170 else pragma Assert
(Nkind
(Type_Def
) = N_Derived_Type_Definition
);
1171 if No
(Component_List
(Record_Extension_Part
(Type_Def
))) then
1175 (Component_List
(Record_Extension_Part
(Type_Def
)));
1179 Rec_Id
:= Defining_Identifier
(N
);
1181 if Present
(V
) and then not Is_Unchecked_Union
(Rec_Id
) then
1183 Enclosing_Func_Id
:= Empty
;
1184 Build_Dcheck_Functions
(V
);
1187 Set_Discr_Check_Funcs_Built
(N
);
1189 end Build_Discr_Checking_Funcs
;
1191 --------------------------------
1192 -- Build_Discriminant_Formals --
1193 --------------------------------
1195 function Build_Discriminant_Formals
1196 (Rec_Id
: Entity_Id
;
1197 Use_Dl
: Boolean) return List_Id
1199 Loc
: Source_Ptr
:= Sloc
(Rec_Id
);
1200 Parameter_List
: constant List_Id
:= New_List
;
1203 Formal_Type
: Entity_Id
;
1204 Param_Spec_Node
: Node_Id
;
1207 if Has_Discriminants
(Rec_Id
) then
1208 D
:= First_Discriminant
(Rec_Id
);
1209 while Present
(D
) loop
1213 Formal
:= Discriminal
(D
);
1214 Formal_Type
:= Etype
(Formal
);
1216 Formal
:= Make_Defining_Identifier
(Loc
, Chars
(D
));
1217 Formal_Type
:= Etype
(D
);
1221 Make_Parameter_Specification
(Loc
,
1222 Defining_Identifier
=> Formal
,
1224 New_Occurrence_Of
(Formal_Type
, Loc
));
1225 Append
(Param_Spec_Node
, Parameter_List
);
1226 Next_Discriminant
(D
);
1230 return Parameter_List
;
1231 end Build_Discriminant_Formals
;
1233 --------------------------------------
1234 -- Build_Equivalent_Array_Aggregate --
1235 --------------------------------------
1237 function Build_Equivalent_Array_Aggregate
(T
: Entity_Id
) return Node_Id
is
1238 Loc
: constant Source_Ptr
:= Sloc
(T
);
1239 Comp_Type
: constant Entity_Id
:= Component_Type
(T
);
1240 Index_Type
: constant Entity_Id
:= Etype
(First_Index
(T
));
1241 Proc
: constant Entity_Id
:= Base_Init_Proc
(T
);
1247 if not Is_Constrained
(T
)
1248 or else Number_Dimensions
(T
) > 1
1251 Initialization_Warning
(T
);
1255 Lo
:= Type_Low_Bound
(Index_Type
);
1256 Hi
:= Type_High_Bound
(Index_Type
);
1258 if not Compile_Time_Known_Value
(Lo
)
1259 or else not Compile_Time_Known_Value
(Hi
)
1261 Initialization_Warning
(T
);
1265 if Is_Record_Type
(Comp_Type
)
1266 and then Present
(Base_Init_Proc
(Comp_Type
))
1268 Expr
:= Static_Initialization
(Base_Init_Proc
(Comp_Type
));
1271 Initialization_Warning
(T
);
1276 Initialization_Warning
(T
);
1280 Aggr
:= Make_Aggregate
(Loc
, No_List
, New_List
);
1281 Set_Etype
(Aggr
, T
);
1282 Set_Aggregate_Bounds
(Aggr
,
1284 Low_Bound
=> New_Copy
(Lo
),
1285 High_Bound
=> New_Copy
(Hi
)));
1286 Set_Parent
(Aggr
, Parent
(Proc
));
1288 Append_To
(Component_Associations
(Aggr
),
1289 Make_Component_Association
(Loc
,
1293 Low_Bound
=> New_Copy
(Lo
),
1294 High_Bound
=> New_Copy
(Hi
))),
1295 Expression
=> Expr
));
1297 if Static_Array_Aggregate
(Aggr
) then
1300 Initialization_Warning
(T
);
1303 end Build_Equivalent_Array_Aggregate
;
1305 ---------------------------------------
1306 -- Build_Equivalent_Record_Aggregate --
1307 ---------------------------------------
1309 function Build_Equivalent_Record_Aggregate
(T
: Entity_Id
) return Node_Id
is
1312 Comp_Type
: Entity_Id
;
1314 -- Start of processing for Build_Equivalent_Record_Aggregate
1317 if not Is_Record_Type
(T
)
1318 or else Has_Discriminants
(T
)
1319 or else Is_Limited_Type
(T
)
1320 or else Has_Non_Standard_Rep
(T
)
1322 Initialization_Warning
(T
);
1326 Comp
:= First_Component
(T
);
1328 -- A null record needs no warning
1334 while Present
(Comp
) loop
1336 -- Array components are acceptable if initialized by a positional
1337 -- aggregate with static components.
1339 if Is_Array_Type
(Etype
(Comp
)) then
1340 Comp_Type
:= Component_Type
(Etype
(Comp
));
1342 if Nkind
(Parent
(Comp
)) /= N_Component_Declaration
1343 or else No
(Expression
(Parent
(Comp
)))
1344 or else Nkind
(Expression
(Parent
(Comp
))) /= N_Aggregate
1346 Initialization_Warning
(T
);
1349 elsif Is_Scalar_Type
(Component_Type
(Etype
(Comp
)))
1351 (not Compile_Time_Known_Value
(Type_Low_Bound
(Comp_Type
))
1353 not Compile_Time_Known_Value
(Type_High_Bound
(Comp_Type
)))
1355 Initialization_Warning
(T
);
1359 not Static_Array_Aggregate
(Expression
(Parent
(Comp
)))
1361 Initialization_Warning
(T
);
1365 elsif Is_Scalar_Type
(Etype
(Comp
)) then
1366 Comp_Type
:= Etype
(Comp
);
1368 if Nkind
(Parent
(Comp
)) /= N_Component_Declaration
1369 or else No
(Expression
(Parent
(Comp
)))
1370 or else not Compile_Time_Known_Value
(Expression
(Parent
(Comp
)))
1371 or else not Compile_Time_Known_Value
(Type_Low_Bound
(Comp_Type
))
1373 Compile_Time_Known_Value
(Type_High_Bound
(Comp_Type
))
1375 Initialization_Warning
(T
);
1379 -- For now, other types are excluded
1382 Initialization_Warning
(T
);
1386 Next_Component
(Comp
);
1389 -- All components have static initialization. Build positional aggregate
1390 -- from the given expressions or defaults.
1392 Agg
:= Make_Aggregate
(Sloc
(T
), New_List
, New_List
);
1393 Set_Parent
(Agg
, Parent
(T
));
1395 Comp
:= First_Component
(T
);
1396 while Present
(Comp
) loop
1398 (New_Copy_Tree
(Expression
(Parent
(Comp
))), Expressions
(Agg
));
1399 Next_Component
(Comp
);
1402 Analyze_And_Resolve
(Agg
, T
);
1404 end Build_Equivalent_Record_Aggregate
;
1406 -------------------------------
1407 -- Build_Initialization_Call --
1408 -------------------------------
1410 -- References to a discriminant inside the record type declaration can
1411 -- appear either in the subtype_indication to constrain a record or an
1412 -- array, or as part of a larger expression given for the initial value
1413 -- of a component. In both of these cases N appears in the record
1414 -- initialization procedure and needs to be replaced by the formal
1415 -- parameter of the initialization procedure which corresponds to that
1418 -- In the example below, references to discriminants D1 and D2 in proc_1
1419 -- are replaced by references to formals with the same name
1422 -- A similar replacement is done for calls to any record initialization
1423 -- procedure for any components that are themselves of a record type.
1425 -- type R (D1, D2 : Integer) is record
1426 -- X : Integer := F * D1;
1427 -- Y : Integer := F * D2;
1430 -- procedure proc_1 (Out_2 : out R; D1 : Integer; D2 : Integer) is
1434 -- Out_2.X := F * D1;
1435 -- Out_2.Y := F * D2;
1438 function Build_Initialization_Call
1442 In_Init_Proc
: Boolean := False;
1443 Enclos_Type
: Entity_Id
:= Empty
;
1444 Discr_Map
: Elist_Id
:= New_Elmt_List
;
1445 With_Default_Init
: Boolean := False;
1446 Constructor_Ref
: Node_Id
:= Empty
) return List_Id
1448 Res
: constant List_Id
:= New_List
;
1454 First_Arg
: Node_Id
;
1455 Full_Init_Type
: Entity_Id
;
1456 Full_Type
: Entity_Id
;
1457 Init_Type
: Entity_Id
;
1461 pragma Assert
(Constructor_Ref
= Empty
1462 or else Is_CPP_Constructor_Call
(Constructor_Ref
));
1464 if No
(Constructor_Ref
) then
1465 Proc
:= Base_Init_Proc
(Typ
);
1467 Proc
:= Base_Init_Proc
(Typ
, Entity
(Name
(Constructor_Ref
)));
1470 pragma Assert
(Present
(Proc
));
1471 Init_Type
:= Etype
(First_Formal
(Proc
));
1472 Full_Init_Type
:= Underlying_Type
(Init_Type
);
1474 -- Nothing to do if the Init_Proc is null, unless Initialize_Scalars
1475 -- is active (in which case we make the call anyway, since in the
1476 -- actual compiled client it may be non null).
1478 if Is_Null_Init_Proc
(Proc
) and then not Init_Or_Norm_Scalars
then
1482 -- Use the [underlying] full view when dealing with a private type. This
1483 -- may require several steps depending on derivations.
1487 if Is_Private_Type
(Full_Type
) then
1488 if Present
(Full_View
(Full_Type
)) then
1489 Full_Type
:= Full_View
(Full_Type
);
1491 elsif Present
(Underlying_Full_View
(Full_Type
)) then
1492 Full_Type
:= Underlying_Full_View
(Full_Type
);
1494 -- When a private type acts as a generic actual and lacks a full
1495 -- view, use the base type.
1497 elsif Is_Generic_Actual_Type
(Full_Type
) then
1498 Full_Type
:= Base_Type
(Full_Type
);
1500 -- The loop has recovered the [underlying] full view, stop the
1507 -- The type is not private, nothing to do
1514 -- If Typ is derived, the procedure is the initialization procedure for
1515 -- the root type. Wrap the argument in an conversion to make it type
1516 -- honest. Actually it isn't quite type honest, because there can be
1517 -- conflicts of views in the private type case. That is why we set
1518 -- Conversion_OK in the conversion node.
1520 if (Is_Record_Type
(Typ
)
1521 or else Is_Array_Type
(Typ
)
1522 or else Is_Private_Type
(Typ
))
1523 and then Init_Type
/= Base_Type
(Typ
)
1525 First_Arg
:= OK_Convert_To
(Etype
(Init_Type
), Id_Ref
);
1526 Set_Etype
(First_Arg
, Init_Type
);
1529 First_Arg
:= Id_Ref
;
1532 Args
:= New_List
(Convert_Concurrent
(First_Arg
, Typ
));
1534 -- In the tasks case, add _Master as the value of the _Master parameter
1535 -- and _Chain as the value of the _Chain parameter. At the outer level,
1536 -- these will be variables holding the corresponding values obtained
1537 -- from GNARL. At inner levels, they will be the parameters passed down
1538 -- through the outer routines.
1540 if Has_Task
(Full_Type
) then
1541 if Restriction_Active
(No_Task_Hierarchy
) then
1543 New_Occurrence_Of
(RTE
(RE_Library_Task_Level
), Loc
));
1545 Append_To
(Args
, Make_Identifier
(Loc
, Name_uMaster
));
1548 -- Add _Chain (not done for sequential elaboration policy, see
1549 -- comment for Create_Restricted_Task_Sequential in s-tarest.ads).
1551 if Partition_Elaboration_Policy
/= 'S' then
1552 Append_To
(Args
, Make_Identifier
(Loc
, Name_uChain
));
1555 -- Ada 2005 (AI-287): In case of default initialized components
1556 -- with tasks, we generate a null string actual parameter.
1557 -- This is just a workaround that must be improved later???
1559 if With_Default_Init
then
1561 Make_String_Literal
(Loc
,
1566 Build_Task_Image_Decls
(Loc
, Id_Ref
, Enclos_Type
, In_Init_Proc
);
1567 Decl
:= Last
(Decls
);
1570 New_Occurrence_Of
(Defining_Identifier
(Decl
), Loc
));
1571 Append_List
(Decls
, Res
);
1579 -- Add discriminant values if discriminants are present
1581 if Has_Discriminants
(Full_Init_Type
) then
1582 Discr
:= First_Discriminant
(Full_Init_Type
);
1583 while Present
(Discr
) loop
1585 -- If this is a discriminated concurrent type, the init_proc
1586 -- for the corresponding record is being called. Use that type
1587 -- directly to find the discriminant value, to handle properly
1588 -- intervening renamed discriminants.
1591 T
: Entity_Id
:= Full_Type
;
1594 if Is_Protected_Type
(T
) then
1595 T
:= Corresponding_Record_Type
(T
);
1599 Get_Discriminant_Value
(
1602 Discriminant_Constraint
(Full_Type
));
1605 -- If the target has access discriminants, and is constrained by
1606 -- an access to the enclosing construct, i.e. a current instance,
1607 -- replace the reference to the type by a reference to the object.
1609 if Nkind
(Arg
) = N_Attribute_Reference
1610 and then Is_Access_Type
(Etype
(Arg
))
1611 and then Is_Entity_Name
(Prefix
(Arg
))
1612 and then Is_Type
(Entity
(Prefix
(Arg
)))
1615 Make_Attribute_Reference
(Loc
,
1616 Prefix
=> New_Copy
(Prefix
(Id_Ref
)),
1617 Attribute_Name
=> Name_Unrestricted_Access
);
1619 elsif In_Init_Proc
then
1621 -- Replace any possible references to the discriminant in the
1622 -- call to the record initialization procedure with references
1623 -- to the appropriate formal parameter.
1625 if Nkind
(Arg
) = N_Identifier
1626 and then Ekind
(Entity
(Arg
)) = E_Discriminant
1628 Arg
:= New_Occurrence_Of
(Discriminal
(Entity
(Arg
)), Loc
);
1630 -- Otherwise make a copy of the default expression. Note that
1631 -- we use the current Sloc for this, because we do not want the
1632 -- call to appear to be at the declaration point. Within the
1633 -- expression, replace discriminants with their discriminals.
1637 New_Copy_Tree
(Arg
, Map
=> Discr_Map
, New_Sloc
=> Loc
);
1641 if Is_Constrained
(Full_Type
) then
1642 Arg
:= Duplicate_Subexpr_No_Checks
(Arg
);
1644 -- The constraints come from the discriminant default exps,
1645 -- they must be reevaluated, so we use New_Copy_Tree but we
1646 -- ensure the proper Sloc (for any embedded calls).
1648 Arg
:= New_Copy_Tree
(Arg
, New_Sloc
=> Loc
);
1652 -- Ada 2005 (AI-287): In case of default initialized components,
1653 -- if the component is constrained with a discriminant of the
1654 -- enclosing type, we need to generate the corresponding selected
1655 -- component node to access the discriminant value. In other cases
1656 -- this is not required, either because we are inside the init
1657 -- proc and we use the corresponding formal, or else because the
1658 -- component is constrained by an expression.
1660 if With_Default_Init
1661 and then Nkind
(Id_Ref
) = N_Selected_Component
1662 and then Nkind
(Arg
) = N_Identifier
1663 and then Ekind
(Entity
(Arg
)) = E_Discriminant
1666 Make_Selected_Component
(Loc
,
1667 Prefix
=> New_Copy_Tree
(Prefix
(Id_Ref
)),
1668 Selector_Name
=> Arg
));
1670 Append_To
(Args
, Arg
);
1673 Next_Discriminant
(Discr
);
1677 -- If this is a call to initialize the parent component of a derived
1678 -- tagged type, indicate that the tag should not be set in the parent.
1680 if Is_Tagged_Type
(Full_Init_Type
)
1681 and then not Is_CPP_Class
(Full_Init_Type
)
1682 and then Nkind
(Id_Ref
) = N_Selected_Component
1683 and then Chars
(Selector_Name
(Id_Ref
)) = Name_uParent
1685 Append_To
(Args
, New_Occurrence_Of
(Standard_False
, Loc
));
1687 elsif Present
(Constructor_Ref
) then
1688 Append_List_To
(Args
,
1689 New_Copy_List
(Parameter_Associations
(Constructor_Ref
)));
1693 Make_Procedure_Call_Statement
(Loc
,
1694 Name
=> New_Occurrence_Of
(Proc
, Loc
),
1695 Parameter_Associations
=> Args
));
1697 if Needs_Finalization
(Typ
)
1698 and then Nkind
(Id_Ref
) = N_Selected_Component
1700 if Chars
(Selector_Name
(Id_Ref
)) /= Name_uParent
then
1703 (Obj_Ref
=> New_Copy_Tree
(First_Arg
),
1711 when RE_Not_Available
=>
1713 end Build_Initialization_Call
;
1715 ----------------------------
1716 -- Build_Record_Init_Proc --
1717 ----------------------------
1719 procedure Build_Record_Init_Proc
(N
: Node_Id
; Rec_Ent
: Entity_Id
) is
1720 Decls
: constant List_Id
:= New_List
;
1721 Discr_Map
: constant Elist_Id
:= New_Elmt_List
;
1722 Loc
: constant Source_Ptr
:= Sloc
(Rec_Ent
);
1724 Proc_Id
: Entity_Id
;
1725 Rec_Type
: Entity_Id
;
1726 Set_Tag
: Entity_Id
:= Empty
;
1728 function Build_Assignment
(Id
: Entity_Id
; N
: Node_Id
) return List_Id
;
1729 -- Build an assignment statement which assigns the default expression
1730 -- to its corresponding record component if defined. The left hand side
1731 -- of the assignment is marked Assignment_OK so that initialization of
1732 -- limited private records works correctly. This routine may also build
1733 -- an adjustment call if the component is controlled.
1735 procedure Build_Discriminant_Assignments
(Statement_List
: List_Id
);
1736 -- If the record has discriminants, add assignment statements to
1737 -- Statement_List to initialize the discriminant values from the
1738 -- arguments of the initialization procedure.
1740 function Build_Init_Statements
(Comp_List
: Node_Id
) return List_Id
;
1741 -- Build a list representing a sequence of statements which initialize
1742 -- components of the given component list. This may involve building
1743 -- case statements for the variant parts. Append any locally declared
1744 -- objects on list Decls.
1746 function Build_Init_Call_Thru
(Parameters
: List_Id
) return List_Id
;
1747 -- Given an untagged type-derivation that declares discriminants, e.g.
1749 -- type R (R1, R2 : Integer) is record ... end record;
1750 -- type D (D1 : Integer) is new R (1, D1);
1752 -- we make the _init_proc of D be
1754 -- procedure _init_proc (X : D; D1 : Integer) is
1756 -- _init_proc (R (X), 1, D1);
1759 -- This function builds the call statement in this _init_proc.
1761 procedure Build_CPP_Init_Procedure
;
1762 -- Build the tree corresponding to the procedure specification and body
1763 -- of the IC procedure that initializes the C++ part of the dispatch
1764 -- table of an Ada tagged type that is a derivation of a CPP type.
1765 -- Install it as the CPP_Init TSS.
1767 procedure Build_Init_Procedure
;
1768 -- Build the tree corresponding to the procedure specification and body
1769 -- of the initialization procedure and install it as the _init TSS.
1771 procedure Build_Offset_To_Top_Functions
;
1772 -- Ada 2005 (AI-251): Build the tree corresponding to the procedure spec
1773 -- and body of Offset_To_Top, a function used in conjuction with types
1774 -- having secondary dispatch tables.
1776 procedure Build_Record_Checks
(S
: Node_Id
; Check_List
: List_Id
);
1777 -- Add range checks to components of discriminated records. S is a
1778 -- subtype indication of a record component. Check_List is a list
1779 -- to which the check actions are appended.
1781 function Component_Needs_Simple_Initialization
1782 (T
: Entity_Id
) return Boolean;
1783 -- Determine if a component needs simple initialization, given its type
1784 -- T. This routine is the same as Needs_Simple_Initialization except for
1785 -- components of type Tag and Interface_Tag. These two access types do
1786 -- not require initialization since they are explicitly initialized by
1789 function Parent_Subtype_Renaming_Discrims
return Boolean;
1790 -- Returns True for base types N that rename discriminants, else False
1792 function Requires_Init_Proc
(Rec_Id
: Entity_Id
) return Boolean;
1793 -- Determine whether a record initialization procedure needs to be
1794 -- generated for the given record type.
1796 ----------------------
1797 -- Build_Assignment --
1798 ----------------------
1800 function Build_Assignment
(Id
: Entity_Id
; N
: Node_Id
) return List_Id
is
1801 N_Loc
: constant Source_Ptr
:= Sloc
(N
);
1802 Typ
: constant Entity_Id
:= Underlying_Type
(Etype
(Id
));
1804 Kind
: Node_Kind
:= Nkind
(N
);
1810 Make_Selected_Component
(N_Loc
,
1811 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
1812 Selector_Name
=> New_Occurrence_Of
(Id
, N_Loc
));
1813 Set_Assignment_OK
(Lhs
);
1815 -- Case of an access attribute applied to the current instance.
1816 -- Replace the reference to the type by a reference to the actual
1817 -- object. (Note that this handles the case of the top level of
1818 -- the expression being given by such an attribute, but does not
1819 -- cover uses nested within an initial value expression. Nested
1820 -- uses are unlikely to occur in practice, but are theoretically
1821 -- possible.) It is not clear how to handle them without fully
1822 -- traversing the expression. ???
1824 if Kind
= N_Attribute_Reference
1825 and then Nam_In
(Attribute_Name
(N
), Name_Unchecked_Access
,
1826 Name_Unrestricted_Access
)
1827 and then Is_Entity_Name
(Prefix
(N
))
1828 and then Is_Type
(Entity
(Prefix
(N
)))
1829 and then Entity
(Prefix
(N
)) = Rec_Type
1832 Make_Attribute_Reference
(N_Loc
,
1834 Make_Identifier
(N_Loc
, Name_uInit
),
1835 Attribute_Name
=> Name_Unrestricted_Access
);
1838 -- Take a copy of Exp to ensure that later copies of this component
1839 -- declaration in derived types see the original tree, not a node
1840 -- rewritten during expansion of the init_proc. If the copy contains
1841 -- itypes, the scope of the new itypes is the init_proc being built.
1843 Exp
:= New_Copy_Tree
(Exp
, New_Scope
=> Proc_Id
);
1846 Make_Assignment_Statement
(Loc
,
1848 Expression
=> Exp
));
1850 Set_No_Ctrl_Actions
(First
(Res
));
1852 -- Adjust the tag if tagged (because of possible view conversions).
1853 -- Suppress the tag adjustment when not Tagged_Type_Expansion because
1854 -- tags are represented implicitly in objects.
1856 if Is_Tagged_Type
(Typ
) and then Tagged_Type_Expansion
then
1858 Make_Assignment_Statement
(N_Loc
,
1860 Make_Selected_Component
(N_Loc
,
1862 New_Copy_Tree
(Lhs
, New_Scope
=> Proc_Id
),
1864 New_Occurrence_Of
(First_Tag_Component
(Typ
), N_Loc
)),
1867 Unchecked_Convert_To
(RTE
(RE_Tag
),
1871 (Access_Disp_Table
(Underlying_Type
(Typ
)))),
1875 -- Adjust the component if controlled except if it is an aggregate
1876 -- that will be expanded inline.
1878 if Kind
= N_Qualified_Expression
then
1879 Kind
:= Nkind
(Expression
(N
));
1882 if Needs_Finalization
(Typ
)
1883 and then not (Nkind_In
(Kind
, N_Aggregate
, N_Extension_Aggregate
))
1884 and then not Is_Limited_View
(Typ
)
1888 (Obj_Ref
=> New_Copy_Tree
(Lhs
),
1889 Typ
=> Etype
(Id
)));
1895 when RE_Not_Available
=>
1897 end Build_Assignment
;
1899 ------------------------------------
1900 -- Build_Discriminant_Assignments --
1901 ------------------------------------
1903 procedure Build_Discriminant_Assignments
(Statement_List
: List_Id
) is
1904 Is_Tagged
: constant Boolean := Is_Tagged_Type
(Rec_Type
);
1909 if Has_Discriminants
(Rec_Type
)
1910 and then not Is_Unchecked_Union
(Rec_Type
)
1912 D
:= First_Discriminant
(Rec_Type
);
1913 while Present
(D
) loop
1915 -- Don't generate the assignment for discriminants in derived
1916 -- tagged types if the discriminant is a renaming of some
1917 -- ancestor discriminant. This initialization will be done
1918 -- when initializing the _parent field of the derived record.
1921 and then Present
(Corresponding_Discriminant
(D
))
1927 Append_List_To
(Statement_List
,
1928 Build_Assignment
(D
,
1929 New_Occurrence_Of
(Discriminal
(D
), D_Loc
)));
1932 Next_Discriminant
(D
);
1935 end Build_Discriminant_Assignments
;
1937 --------------------------
1938 -- Build_Init_Call_Thru --
1939 --------------------------
1941 function Build_Init_Call_Thru
(Parameters
: List_Id
) return List_Id
is
1942 Parent_Proc
: constant Entity_Id
:=
1943 Base_Init_Proc
(Etype
(Rec_Type
));
1945 Parent_Type
: constant Entity_Id
:=
1946 Etype
(First_Formal
(Parent_Proc
));
1948 Uparent_Type
: constant Entity_Id
:=
1949 Underlying_Type
(Parent_Type
);
1951 First_Discr_Param
: Node_Id
;
1955 First_Arg
: Node_Id
;
1956 Parent_Discr
: Entity_Id
;
1960 -- First argument (_Init) is the object to be initialized.
1961 -- ??? not sure where to get a reasonable Loc for First_Arg
1964 OK_Convert_To
(Parent_Type
,
1966 (Defining_Identifier
(First
(Parameters
)), Loc
));
1968 Set_Etype
(First_Arg
, Parent_Type
);
1970 Args
:= New_List
(Convert_Concurrent
(First_Arg
, Rec_Type
));
1972 -- In the tasks case,
1973 -- add _Master as the value of the _Master parameter
1974 -- add _Chain as the value of the _Chain parameter.
1975 -- add _Task_Name as the value of the _Task_Name parameter.
1976 -- At the outer level, these will be variables holding the
1977 -- corresponding values obtained from GNARL or the expander.
1979 -- At inner levels, they will be the parameters passed down through
1980 -- the outer routines.
1982 First_Discr_Param
:= Next
(First
(Parameters
));
1984 if Has_Task
(Rec_Type
) then
1985 if Restriction_Active
(No_Task_Hierarchy
) then
1987 New_Occurrence_Of
(RTE
(RE_Library_Task_Level
), Loc
));
1989 Append_To
(Args
, Make_Identifier
(Loc
, Name_uMaster
));
1992 -- Add _Chain (not done for sequential elaboration policy, see
1993 -- comment for Create_Restricted_Task_Sequential in s-tarest.ads).
1995 if Partition_Elaboration_Policy
/= 'S' then
1996 Append_To
(Args
, Make_Identifier
(Loc
, Name_uChain
));
1999 Append_To
(Args
, Make_Identifier
(Loc
, Name_uTask_Name
));
2000 First_Discr_Param
:= Next
(Next
(Next
(First_Discr_Param
)));
2003 -- Append discriminant values
2005 if Has_Discriminants
(Uparent_Type
) then
2006 pragma Assert
(not Is_Tagged_Type
(Uparent_Type
));
2008 Parent_Discr
:= First_Discriminant
(Uparent_Type
);
2009 while Present
(Parent_Discr
) loop
2011 -- Get the initial value for this discriminant
2012 -- ??? needs to be cleaned up to use parent_Discr_Constr
2016 Discr
: Entity_Id
:=
2017 First_Stored_Discriminant
(Uparent_Type
);
2019 Discr_Value
: Elmt_Id
:=
2020 First_Elmt
(Stored_Constraint
(Rec_Type
));
2023 while Original_Record_Component
(Parent_Discr
) /= Discr
loop
2024 Next_Stored_Discriminant
(Discr
);
2025 Next_Elmt
(Discr_Value
);
2028 Arg
:= Node
(Discr_Value
);
2031 -- Append it to the list
2033 if Nkind
(Arg
) = N_Identifier
2034 and then Ekind
(Entity
(Arg
)) = E_Discriminant
2037 New_Occurrence_Of
(Discriminal
(Entity
(Arg
)), Loc
));
2039 -- Case of access discriminants. We replace the reference
2040 -- to the type by a reference to the actual object.
2042 -- Is above comment right??? Use of New_Copy below seems mighty
2046 Append_To
(Args
, New_Copy
(Arg
));
2049 Next_Discriminant
(Parent_Discr
);
2055 Make_Procedure_Call_Statement
(Loc
,
2057 New_Occurrence_Of
(Parent_Proc
, Loc
),
2058 Parameter_Associations
=> Args
));
2061 end Build_Init_Call_Thru
;
2063 -----------------------------------
2064 -- Build_Offset_To_Top_Functions --
2065 -----------------------------------
2067 procedure Build_Offset_To_Top_Functions
is
2069 procedure Build_Offset_To_Top_Function
(Iface_Comp
: Entity_Id
);
2071 -- function Fxx (O : Address) return Storage_Offset is
2072 -- type Acc is access all <Typ>;
2074 -- return Acc!(O).Iface_Comp'Position;
2077 ----------------------------------
2078 -- Build_Offset_To_Top_Function --
2079 ----------------------------------
2081 procedure Build_Offset_To_Top_Function
(Iface_Comp
: Entity_Id
) is
2082 Body_Node
: Node_Id
;
2083 Func_Id
: Entity_Id
;
2084 Spec_Node
: Node_Id
;
2085 Acc_Type
: Entity_Id
;
2088 Func_Id
:= Make_Temporary
(Loc
, 'F');
2089 Set_DT_Offset_To_Top_Func
(Iface_Comp
, Func_Id
);
2092 -- function Fxx (O : in Rec_Typ) return Storage_Offset;
2094 Spec_Node
:= New_Node
(N_Function_Specification
, Loc
);
2095 Set_Defining_Unit_Name
(Spec_Node
, Func_Id
);
2096 Set_Parameter_Specifications
(Spec_Node
, New_List
(
2097 Make_Parameter_Specification
(Loc
,
2098 Defining_Identifier
=>
2099 Make_Defining_Identifier
(Loc
, Name_uO
),
2102 New_Occurrence_Of
(RTE
(RE_Address
), Loc
))));
2103 Set_Result_Definition
(Spec_Node
,
2104 New_Occurrence_Of
(RTE
(RE_Storage_Offset
), Loc
));
2107 -- function Fxx (O : in Rec_Typ) return Storage_Offset is
2109 -- return O.Iface_Comp'Position;
2112 Body_Node
:= New_Node
(N_Subprogram_Body
, Loc
);
2113 Set_Specification
(Body_Node
, Spec_Node
);
2115 Acc_Type
:= Make_Temporary
(Loc
, 'T');
2116 Set_Declarations
(Body_Node
, New_List
(
2117 Make_Full_Type_Declaration
(Loc
,
2118 Defining_Identifier
=> Acc_Type
,
2120 Make_Access_To_Object_Definition
(Loc
,
2121 All_Present
=> True,
2122 Null_Exclusion_Present
=> False,
2123 Constant_Present
=> False,
2124 Subtype_Indication
=>
2125 New_Occurrence_Of
(Rec_Type
, Loc
)))));
2127 Set_Handled_Statement_Sequence
(Body_Node
,
2128 Make_Handled_Sequence_Of_Statements
(Loc
,
2129 Statements
=> New_List
(
2130 Make_Simple_Return_Statement
(Loc
,
2132 Make_Attribute_Reference
(Loc
,
2134 Make_Selected_Component
(Loc
,
2136 Unchecked_Convert_To
(Acc_Type
,
2137 Make_Identifier
(Loc
, Name_uO
)),
2139 New_Occurrence_Of
(Iface_Comp
, Loc
)),
2140 Attribute_Name
=> Name_Position
)))));
2142 Set_Ekind
(Func_Id
, E_Function
);
2143 Set_Mechanism
(Func_Id
, Default_Mechanism
);
2144 Set_Is_Internal
(Func_Id
, True);
2146 if not Debug_Generated_Code
then
2147 Set_Debug_Info_Off
(Func_Id
);
2150 Analyze
(Body_Node
);
2152 Append_Freeze_Action
(Rec_Type
, Body_Node
);
2153 end Build_Offset_To_Top_Function
;
2157 Iface_Comp
: Node_Id
;
2158 Iface_Comp_Elmt
: Elmt_Id
;
2159 Ifaces_Comp_List
: Elist_Id
;
2161 -- Start of processing for Build_Offset_To_Top_Functions
2164 -- Offset_To_Top_Functions are built only for derivations of types
2165 -- with discriminants that cover interface types.
2166 -- Nothing is needed either in case of virtual targets, since
2167 -- interfaces are handled directly by the target.
2169 if not Is_Tagged_Type
(Rec_Type
)
2170 or else Etype
(Rec_Type
) = Rec_Type
2171 or else not Has_Discriminants
(Etype
(Rec_Type
))
2172 or else not Tagged_Type_Expansion
2177 Collect_Interface_Components
(Rec_Type
, Ifaces_Comp_List
);
2179 -- For each interface type with secondary dispatch table we generate
2180 -- the Offset_To_Top_Functions (required to displace the pointer in
2181 -- interface conversions)
2183 Iface_Comp_Elmt
:= First_Elmt
(Ifaces_Comp_List
);
2184 while Present
(Iface_Comp_Elmt
) loop
2185 Iface_Comp
:= Node
(Iface_Comp_Elmt
);
2186 pragma Assert
(Is_Interface
(Related_Type
(Iface_Comp
)));
2188 -- If the interface is a parent of Rec_Type it shares the primary
2189 -- dispatch table and hence there is no need to build the function
2191 if not Is_Ancestor
(Related_Type
(Iface_Comp
), Rec_Type
,
2192 Use_Full_View
=> True)
2194 Build_Offset_To_Top_Function
(Iface_Comp
);
2197 Next_Elmt
(Iface_Comp_Elmt
);
2199 end Build_Offset_To_Top_Functions
;
2201 ------------------------------
2202 -- Build_CPP_Init_Procedure --
2203 ------------------------------
2205 procedure Build_CPP_Init_Procedure
is
2206 Body_Node
: Node_Id
;
2207 Body_Stmts
: List_Id
;
2208 Flag_Id
: Entity_Id
;
2209 Handled_Stmt_Node
: Node_Id
;
2210 Init_Tags_List
: List_Id
;
2211 Proc_Id
: Entity_Id
;
2212 Proc_Spec_Node
: Node_Id
;
2215 -- Check cases requiring no IC routine
2217 if not Is_CPP_Class
(Root_Type
(Rec_Type
))
2218 or else Is_CPP_Class
(Rec_Type
)
2219 or else CPP_Num_Prims
(Rec_Type
) = 0
2220 or else not Tagged_Type_Expansion
2221 or else No_Run_Time_Mode
2228 -- Flag : Boolean := False;
2230 -- procedure Typ_IC is
2233 -- Copy C++ dispatch table slots from parent
2234 -- Update C++ slots of overridden primitives
2238 Flag_Id
:= Make_Temporary
(Loc
, 'F');
2240 Append_Freeze_Action
(Rec_Type
,
2241 Make_Object_Declaration
(Loc
,
2242 Defining_Identifier
=> Flag_Id
,
2243 Object_Definition
=>
2244 New_Occurrence_Of
(Standard_Boolean
, Loc
),
2246 New_Occurrence_Of
(Standard_True
, Loc
)));
2248 Body_Stmts
:= New_List
;
2249 Body_Node
:= New_Node
(N_Subprogram_Body
, Loc
);
2251 Proc_Spec_Node
:= New_Node
(N_Procedure_Specification
, Loc
);
2254 Make_Defining_Identifier
(Loc
,
2255 Chars
=> Make_TSS_Name
(Rec_Type
, TSS_CPP_Init_Proc
));
2257 Set_Ekind
(Proc_Id
, E_Procedure
);
2258 Set_Is_Internal
(Proc_Id
);
2260 Set_Defining_Unit_Name
(Proc_Spec_Node
, Proc_Id
);
2262 Set_Parameter_Specifications
(Proc_Spec_Node
, New_List
);
2263 Set_Specification
(Body_Node
, Proc_Spec_Node
);
2264 Set_Declarations
(Body_Node
, New_List
);
2266 Init_Tags_List
:= Build_Inherit_CPP_Prims
(Rec_Type
);
2268 Append_To
(Init_Tags_List
,
2269 Make_Assignment_Statement
(Loc
,
2271 New_Occurrence_Of
(Flag_Id
, Loc
),
2273 New_Occurrence_Of
(Standard_False
, Loc
)));
2275 Append_To
(Body_Stmts
,
2276 Make_If_Statement
(Loc
,
2277 Condition
=> New_Occurrence_Of
(Flag_Id
, Loc
),
2278 Then_Statements
=> Init_Tags_List
));
2280 Handled_Stmt_Node
:=
2281 New_Node
(N_Handled_Sequence_Of_Statements
, Loc
);
2282 Set_Statements
(Handled_Stmt_Node
, Body_Stmts
);
2283 Set_Exception_Handlers
(Handled_Stmt_Node
, No_List
);
2284 Set_Handled_Statement_Sequence
(Body_Node
, Handled_Stmt_Node
);
2286 if not Debug_Generated_Code
then
2287 Set_Debug_Info_Off
(Proc_Id
);
2290 -- Associate CPP_Init_Proc with type
2292 Set_Init_Proc
(Rec_Type
, Proc_Id
);
2293 end Build_CPP_Init_Procedure
;
2295 --------------------------
2296 -- Build_Init_Procedure --
2297 --------------------------
2299 procedure Build_Init_Procedure
is
2300 Body_Stmts
: List_Id
;
2301 Body_Node
: Node_Id
;
2302 Handled_Stmt_Node
: Node_Id
;
2303 Init_Tags_List
: List_Id
;
2304 Parameters
: List_Id
;
2305 Proc_Spec_Node
: Node_Id
;
2306 Record_Extension_Node
: Node_Id
;
2309 Body_Stmts
:= New_List
;
2310 Body_Node
:= New_Node
(N_Subprogram_Body
, Loc
);
2311 Set_Ekind
(Proc_Id
, E_Procedure
);
2313 Proc_Spec_Node
:= New_Node
(N_Procedure_Specification
, Loc
);
2314 Set_Defining_Unit_Name
(Proc_Spec_Node
, Proc_Id
);
2316 Parameters
:= Init_Formals
(Rec_Type
);
2317 Append_List_To
(Parameters
,
2318 Build_Discriminant_Formals
(Rec_Type
, True));
2320 -- For tagged types, we add a flag to indicate whether the routine
2321 -- is called to initialize a parent component in the init_proc of
2322 -- a type extension. If the flag is false, we do not set the tag
2323 -- because it has been set already in the extension.
2325 if Is_Tagged_Type
(Rec_Type
) then
2326 Set_Tag
:= Make_Temporary
(Loc
, 'P');
2328 Append_To
(Parameters
,
2329 Make_Parameter_Specification
(Loc
,
2330 Defining_Identifier
=> Set_Tag
,
2332 New_Occurrence_Of
(Standard_Boolean
, Loc
),
2334 New_Occurrence_Of
(Standard_True
, Loc
)));
2337 Set_Parameter_Specifications
(Proc_Spec_Node
, Parameters
);
2338 Set_Specification
(Body_Node
, Proc_Spec_Node
);
2339 Set_Declarations
(Body_Node
, Decls
);
2341 -- N is a Derived_Type_Definition that renames the parameters of the
2342 -- ancestor type. We initialize it by expanding our discriminants and
2343 -- call the ancestor _init_proc with a type-converted object.
2345 if Parent_Subtype_Renaming_Discrims
then
2346 Append_List_To
(Body_Stmts
, Build_Init_Call_Thru
(Parameters
));
2348 elsif Nkind
(Type_Definition
(N
)) = N_Record_Definition
then
2349 Build_Discriminant_Assignments
(Body_Stmts
);
2351 if not Null_Present
(Type_Definition
(N
)) then
2352 Append_List_To
(Body_Stmts
,
2353 Build_Init_Statements
(Component_List
(Type_Definition
(N
))));
2356 -- N is a Derived_Type_Definition with a possible non-empty
2357 -- extension. The initialization of a type extension consists in the
2358 -- initialization of the components in the extension.
2361 Build_Discriminant_Assignments
(Body_Stmts
);
2363 Record_Extension_Node
:=
2364 Record_Extension_Part
(Type_Definition
(N
));
2366 if not Null_Present
(Record_Extension_Node
) then
2368 Stmts
: constant List_Id
:=
2369 Build_Init_Statements
(
2370 Component_List
(Record_Extension_Node
));
2373 -- The parent field must be initialized first because the
2374 -- offset of the new discriminants may depend on it. This is
2375 -- not needed if the parent is an interface type because in
2376 -- such case the initialization of the _parent field was not
2379 if not Is_Interface
(Etype
(Rec_Ent
)) then
2381 Parent_IP
: constant Name_Id
:=
2382 Make_Init_Proc_Name
(Etype
(Rec_Ent
));
2388 -- Look for a call to the parent IP at the beginning
2389 -- of Stmts associated with the record extension
2391 Stmt
:= First
(Stmts
);
2393 while Present
(Stmt
) loop
2394 if Nkind
(Stmt
) = N_Procedure_Call_Statement
2395 and then Chars
(Name
(Stmt
)) = Parent_IP
2404 -- If found then move it to the beginning of the
2405 -- statements of this IP routine
2407 if Present
(IP_Call
) then
2408 IP_Stmts
:= New_List
;
2410 Stmt
:= Remove_Head
(Stmts
);
2411 Append_To
(IP_Stmts
, Stmt
);
2412 exit when Stmt
= IP_Call
;
2415 Prepend_List_To
(Body_Stmts
, IP_Stmts
);
2420 Append_List_To
(Body_Stmts
, Stmts
);
2425 -- Add here the assignment to instantiate the Tag
2427 -- The assignment corresponds to the code:
2429 -- _Init._Tag := Typ'Tag;
2431 -- Suppress the tag assignment when not Tagged_Type_Expansion because
2432 -- tags are represented implicitly in objects. It is also suppressed
2433 -- in case of CPP_Class types because in this case the tag is
2434 -- initialized in the C++ side.
2436 if Is_Tagged_Type
(Rec_Type
)
2437 and then Tagged_Type_Expansion
2438 and then not No_Run_Time_Mode
2440 -- Case 1: Ada tagged types with no CPP ancestor. Set the tags of
2441 -- the actual object and invoke the IP of the parent (in this
2442 -- order). The tag must be initialized before the call to the IP
2443 -- of the parent and the assignments to other components because
2444 -- the initial value of the components may depend on the tag (eg.
2445 -- through a dispatching operation on an access to the current
2446 -- type). The tag assignment is not done when initializing the
2447 -- parent component of a type extension, because in that case the
2448 -- tag is set in the extension.
2450 if not Is_CPP_Class
(Root_Type
(Rec_Type
)) then
2452 -- Initialize the primary tag component
2454 Init_Tags_List
:= New_List
(
2455 Make_Assignment_Statement
(Loc
,
2457 Make_Selected_Component
(Loc
,
2458 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
2461 (First_Tag_Component
(Rec_Type
), Loc
)),
2465 (First_Elmt
(Access_Disp_Table
(Rec_Type
))), Loc
)));
2467 -- Ada 2005 (AI-251): Initialize the secondary tags components
2468 -- located at fixed positions (tags whose position depends on
2469 -- variable size components are initialized later ---see below)
2471 if Ada_Version
>= Ada_2005
2472 and then not Is_Interface
(Rec_Type
)
2473 and then Has_Interfaces
(Rec_Type
)
2477 Target
=> Make_Identifier
(Loc
, Name_uInit
),
2478 Stmts_List
=> Init_Tags_List
,
2479 Fixed_Comps
=> True,
2480 Variable_Comps
=> False);
2483 Prepend_To
(Body_Stmts
,
2484 Make_If_Statement
(Loc
,
2485 Condition
=> New_Occurrence_Of
(Set_Tag
, Loc
),
2486 Then_Statements
=> Init_Tags_List
));
2488 -- Case 2: CPP type. The imported C++ constructor takes care of
2489 -- tags initialization. No action needed here because the IP
2490 -- is built by Set_CPP_Constructors; in this case the IP is a
2491 -- wrapper that invokes the C++ constructor and copies the C++
2492 -- tags locally. Done to inherit the C++ slots in Ada derivations
2495 elsif Is_CPP_Class
(Rec_Type
) then
2496 pragma Assert
(False);
2499 -- Case 3: Combined hierarchy containing C++ types and Ada tagged
2500 -- type derivations. Derivations of imported C++ classes add a
2501 -- complication, because we cannot inhibit tag setting in the
2502 -- constructor for the parent. Hence we initialize the tag after
2503 -- the call to the parent IP (that is, in reverse order compared
2504 -- with pure Ada hierarchies ---see comment on case 1).
2507 -- Initialize the primary tag
2509 Init_Tags_List
:= New_List
(
2510 Make_Assignment_Statement
(Loc
,
2512 Make_Selected_Component
(Loc
,
2513 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
2516 (First_Tag_Component
(Rec_Type
), Loc
)),
2520 (First_Elmt
(Access_Disp_Table
(Rec_Type
))), Loc
)));
2522 -- Ada 2005 (AI-251): Initialize the secondary tags components
2523 -- located at fixed positions (tags whose position depends on
2524 -- variable size components are initialized later ---see below)
2526 if Ada_Version
>= Ada_2005
2527 and then not Is_Interface
(Rec_Type
)
2528 and then Has_Interfaces
(Rec_Type
)
2532 Target
=> Make_Identifier
(Loc
, Name_uInit
),
2533 Stmts_List
=> Init_Tags_List
,
2534 Fixed_Comps
=> True,
2535 Variable_Comps
=> False);
2538 -- Initialize the tag component after invocation of parent IP.
2541 -- parent_IP(_init.parent); // Invokes the C++ constructor
2542 -- [ typIC; ] // Inherit C++ slots from parent
2549 -- Search for the call to the IP of the parent. We assume
2550 -- that the first init_proc call is for the parent.
2552 Ins_Nod
:= First
(Body_Stmts
);
2553 while Present
(Next
(Ins_Nod
))
2554 and then (Nkind
(Ins_Nod
) /= N_Procedure_Call_Statement
2555 or else not Is_Init_Proc
(Name
(Ins_Nod
)))
2560 -- The IC routine copies the inherited slots of the C+ part
2561 -- of the dispatch table from the parent and updates the
2562 -- overridden C++ slots.
2564 if CPP_Num_Prims
(Rec_Type
) > 0 then
2566 Init_DT
: Entity_Id
;
2570 Init_DT
:= CPP_Init_Proc
(Rec_Type
);
2571 pragma Assert
(Present
(Init_DT
));
2574 Make_Procedure_Call_Statement
(Loc
,
2575 New_Occurrence_Of
(Init_DT
, Loc
));
2576 Insert_After
(Ins_Nod
, New_Nod
);
2578 -- Update location of init tag statements
2584 Insert_List_After
(Ins_Nod
, Init_Tags_List
);
2588 -- Ada 2005 (AI-251): Initialize the secondary tag components
2589 -- located at variable positions. We delay the generation of this
2590 -- code until here because the value of the attribute 'Position
2591 -- applied to variable size components of the parent type that
2592 -- depend on discriminants is only safely read at runtime after
2593 -- the parent components have been initialized.
2595 if Ada_Version
>= Ada_2005
2596 and then not Is_Interface
(Rec_Type
)
2597 and then Has_Interfaces
(Rec_Type
)
2598 and then Has_Discriminants
(Etype
(Rec_Type
))
2599 and then Is_Variable_Size_Record
(Etype
(Rec_Type
))
2601 Init_Tags_List
:= New_List
;
2605 Target
=> Make_Identifier
(Loc
, Name_uInit
),
2606 Stmts_List
=> Init_Tags_List
,
2607 Fixed_Comps
=> False,
2608 Variable_Comps
=> True);
2610 if Is_Non_Empty_List
(Init_Tags_List
) then
2611 Append_List_To
(Body_Stmts
, Init_Tags_List
);
2616 Handled_Stmt_Node
:= New_Node
(N_Handled_Sequence_Of_Statements
, Loc
);
2617 Set_Statements
(Handled_Stmt_Node
, Body_Stmts
);
2620 -- Deep_Finalize (_init, C1, ..., CN);
2624 and then Needs_Finalization
(Rec_Type
)
2625 and then not Is_Abstract_Type
(Rec_Type
)
2626 and then not Restriction_Active
(No_Exception_Propagation
)
2633 -- Create a local version of Deep_Finalize which has indication
2634 -- of partial initialization state.
2636 DF_Id
:= Make_Temporary
(Loc
, 'F');
2638 Append_To
(Decls
, Make_Local_Deep_Finalize
(Rec_Type
, DF_Id
));
2641 Make_Procedure_Call_Statement
(Loc
,
2642 Name
=> New_Occurrence_Of
(DF_Id
, Loc
),
2643 Parameter_Associations
=> New_List
(
2644 Make_Identifier
(Loc
, Name_uInit
),
2645 New_Occurrence_Of
(Standard_False
, Loc
)));
2647 -- Do not emit warnings related to the elaboration order when a
2648 -- controlled object is declared before the body of Finalize is
2651 Set_No_Elaboration_Check
(DF_Call
);
2653 Set_Exception_Handlers
(Handled_Stmt_Node
, New_List
(
2654 Make_Exception_Handler
(Loc
,
2655 Exception_Choices
=> New_List
(
2656 Make_Others_Choice
(Loc
)),
2657 Statements
=> New_List
(
2659 Make_Raise_Statement
(Loc
)))));
2662 Set_Exception_Handlers
(Handled_Stmt_Node
, No_List
);
2665 Set_Handled_Statement_Sequence
(Body_Node
, Handled_Stmt_Node
);
2667 if not Debug_Generated_Code
then
2668 Set_Debug_Info_Off
(Proc_Id
);
2671 -- Associate Init_Proc with type, and determine if the procedure
2672 -- is null (happens because of the Initialize_Scalars pragma case,
2673 -- where we have to generate a null procedure in case it is called
2674 -- by a client with Initialize_Scalars set). Such procedures have
2675 -- to be generated, but do not have to be called, so we mark them
2676 -- as null to suppress the call.
2678 Set_Init_Proc
(Rec_Type
, Proc_Id
);
2680 if List_Length
(Body_Stmts
) = 1
2682 -- We must skip SCIL nodes because they may have been added to this
2683 -- list by Insert_Actions.
2685 and then Nkind
(First_Non_SCIL_Node
(Body_Stmts
)) = N_Null_Statement
2687 Set_Is_Null_Init_Proc
(Proc_Id
);
2689 end Build_Init_Procedure
;
2691 ---------------------------
2692 -- Build_Init_Statements --
2693 ---------------------------
2695 function Build_Init_Statements
(Comp_List
: Node_Id
) return List_Id
is
2696 Checks
: constant List_Id
:= New_List
;
2697 Actions
: List_Id
:= No_List
;
2698 Counter_Id
: Entity_Id
:= Empty
;
2699 Comp_Loc
: Source_Ptr
;
2703 Parent_Stmts
: List_Id
;
2707 procedure Increment_Counter
(Loc
: Source_Ptr
);
2708 -- Generate an "increment by one" statement for the current counter
2709 -- and append it to the list Stmts.
2711 procedure Make_Counter
(Loc
: Source_Ptr
);
2712 -- Create a new counter for the current component list. The routine
2713 -- creates a new defining Id, adds an object declaration and sets
2714 -- the Id generator for the next variant.
2716 -----------------------
2717 -- Increment_Counter --
2718 -----------------------
2720 procedure Increment_Counter
(Loc
: Source_Ptr
) is
2723 -- Counter := Counter + 1;
2726 Make_Assignment_Statement
(Loc
,
2727 Name
=> New_Occurrence_Of
(Counter_Id
, Loc
),
2730 Left_Opnd
=> New_Occurrence_Of
(Counter_Id
, Loc
),
2731 Right_Opnd
=> Make_Integer_Literal
(Loc
, 1))));
2732 end Increment_Counter
;
2738 procedure Make_Counter
(Loc
: Source_Ptr
) is
2740 -- Increment the Id generator
2742 Counter
:= Counter
+ 1;
2744 -- Create the entity and declaration
2747 Make_Defining_Identifier
(Loc
,
2748 Chars
=> New_External_Name
('C', Counter
));
2751 -- Cnn : Integer := 0;
2754 Make_Object_Declaration
(Loc
,
2755 Defining_Identifier
=> Counter_Id
,
2756 Object_Definition
=>
2757 New_Occurrence_Of
(Standard_Integer
, Loc
),
2759 Make_Integer_Literal
(Loc
, 0)));
2762 -- Start of processing for Build_Init_Statements
2765 if Null_Present
(Comp_List
) then
2766 return New_List
(Make_Null_Statement
(Loc
));
2769 Parent_Stmts
:= New_List
;
2772 -- Loop through visible declarations of task types and protected
2773 -- types moving any expanded code from the spec to the body of the
2776 if Is_Task_Record_Type
(Rec_Type
)
2777 or else Is_Protected_Record_Type
(Rec_Type
)
2780 Decl
: constant Node_Id
:=
2781 Parent
(Corresponding_Concurrent_Type
(Rec_Type
));
2787 if Is_Task_Record_Type
(Rec_Type
) then
2788 Def
:= Task_Definition
(Decl
);
2790 Def
:= Protected_Definition
(Decl
);
2793 if Present
(Def
) then
2794 N1
:= First
(Visible_Declarations
(Def
));
2795 while Present
(N1
) loop
2799 if Nkind
(N2
) in N_Statement_Other_Than_Procedure_Call
2800 or else Nkind
(N2
) in N_Raise_xxx_Error
2801 or else Nkind
(N2
) = N_Procedure_Call_Statement
2804 New_Copy_Tree
(N2
, New_Scope
=> Proc_Id
));
2805 Rewrite
(N2
, Make_Null_Statement
(Sloc
(N2
)));
2813 -- Loop through components, skipping pragmas, in 2 steps. The first
2814 -- step deals with regular components. The second step deals with
2815 -- components that have per object constraints and no explicit
2820 -- First pass : regular components
2822 Decl
:= First_Non_Pragma
(Component_Items
(Comp_List
));
2823 while Present
(Decl
) loop
2824 Comp_Loc
:= Sloc
(Decl
);
2826 (Subtype_Indication
(Component_Definition
(Decl
)), Checks
);
2828 Id
:= Defining_Identifier
(Decl
);
2831 -- Leave any processing of per-object constrained component for
2834 if Has_Access_Constraint
(Id
) and then No
(Expression
(Decl
)) then
2837 -- Regular component cases
2840 -- In the context of the init proc, references to discriminants
2841 -- resolve to denote the discriminals: this is where we can
2842 -- freeze discriminant dependent component subtypes.
2844 if not Is_Frozen
(Typ
) then
2845 Append_List_To
(Stmts
, Freeze_Entity
(Typ
, N
));
2848 -- Explicit initialization
2850 if Present
(Expression
(Decl
)) then
2851 if Is_CPP_Constructor_Call
(Expression
(Decl
)) then
2853 Build_Initialization_Call
2856 Make_Selected_Component
(Comp_Loc
,
2858 Make_Identifier
(Comp_Loc
, Name_uInit
),
2860 New_Occurrence_Of
(Id
, Comp_Loc
)),
2862 In_Init_Proc
=> True,
2863 Enclos_Type
=> Rec_Type
,
2864 Discr_Map
=> Discr_Map
,
2865 Constructor_Ref
=> Expression
(Decl
));
2867 Actions
:= Build_Assignment
(Id
, Expression
(Decl
));
2870 -- CPU, Dispatching_Domain, Priority and Size components are
2871 -- filled with the corresponding rep item expression of the
2872 -- concurrent type (if any).
2874 elsif Ekind
(Scope
(Id
)) = E_Record_Type
2875 and then Present
(Corresponding_Concurrent_Type
(Scope
(Id
)))
2876 and then Nam_In
(Chars
(Id
), Name_uCPU
,
2877 Name_uDispatching_Domain
,
2886 if Chars
(Id
) = Name_uCPU
then
2889 elsif Chars
(Id
) = Name_uDispatching_Domain
then
2890 Nam
:= Name_Dispatching_Domain
;
2892 elsif Chars
(Id
) = Name_uPriority
then
2893 Nam
:= Name_Priority
;
2896 -- Get the Rep Item (aspect specification, attribute
2897 -- definition clause or pragma) of the corresponding
2902 (Corresponding_Concurrent_Type
(Scope
(Id
)),
2904 Check_Parents
=> False);
2906 if Present
(Ritem
) then
2910 if Nkind
(Ritem
) = N_Pragma
then
2911 Exp
:= First
(Pragma_Argument_Associations
(Ritem
));
2913 if Nkind
(Exp
) = N_Pragma_Argument_Association
then
2914 Exp
:= Expression
(Exp
);
2917 -- Conversion for Priority expression
2919 if Nam
= Name_Priority
then
2920 if Pragma_Name
(Ritem
) = Name_Priority
2921 and then not GNAT_Mode
2923 Exp
:= Convert_To
(RTE
(RE_Priority
), Exp
);
2926 Convert_To
(RTE
(RE_Any_Priority
), Exp
);
2930 -- Aspect/Attribute definition clause case
2933 Exp
:= Expression
(Ritem
);
2935 -- Conversion for Priority expression
2937 if Nam
= Name_Priority
then
2938 if Chars
(Ritem
) = Name_Priority
2939 and then not GNAT_Mode
2941 Exp
:= Convert_To
(RTE
(RE_Priority
), Exp
);
2944 Convert_To
(RTE
(RE_Any_Priority
), Exp
);
2949 -- Conversion for Dispatching_Domain value
2951 if Nam
= Name_Dispatching_Domain
then
2953 Unchecked_Convert_To
2954 (RTE
(RE_Dispatching_Domain_Access
), Exp
);
2957 Actions
:= Build_Assignment
(Id
, Exp
);
2959 -- Nothing needed if no Rep Item
2966 -- Composite component with its own Init_Proc
2968 elsif not Is_Interface
(Typ
)
2969 and then Has_Non_Null_Base_Init_Proc
(Typ
)
2972 Build_Initialization_Call
2974 Make_Selected_Component
(Comp_Loc
,
2976 Make_Identifier
(Comp_Loc
, Name_uInit
),
2977 Selector_Name
=> New_Occurrence_Of
(Id
, Comp_Loc
)),
2979 In_Init_Proc
=> True,
2980 Enclos_Type
=> Rec_Type
,
2981 Discr_Map
=> Discr_Map
);
2983 Clean_Task_Names
(Typ
, Proc_Id
);
2985 -- Simple initialization
2987 elsif Component_Needs_Simple_Initialization
(Typ
) then
2990 (Id
, Get_Simple_Init_Val
(Typ
, N
, Esize
(Id
)));
2992 -- Nothing needed for this case
2998 if Present
(Checks
) then
2999 if Chars
(Id
) = Name_uParent
then
3000 Append_List_To
(Parent_Stmts
, Checks
);
3002 Append_List_To
(Stmts
, Checks
);
3006 if Present
(Actions
) then
3007 if Chars
(Id
) = Name_uParent
then
3008 Append_List_To
(Parent_Stmts
, Actions
);
3011 Append_List_To
(Stmts
, Actions
);
3013 -- Preserve initialization state in the current counter
3015 if Needs_Finalization
(Typ
) then
3016 if No
(Counter_Id
) then
3017 Make_Counter
(Comp_Loc
);
3020 Increment_Counter
(Comp_Loc
);
3026 Next_Non_Pragma
(Decl
);
3029 -- The parent field must be initialized first because variable
3030 -- size components of the parent affect the location of all the
3033 Prepend_List_To
(Stmts
, Parent_Stmts
);
3035 -- Set up tasks and protected object support. This needs to be done
3036 -- before any component with a per-object access discriminant
3037 -- constraint, or any variant part (which may contain such
3038 -- components) is initialized, because the initialization of these
3039 -- components may reference the enclosing concurrent object.
3041 -- For a task record type, add the task create call and calls to bind
3042 -- any interrupt (signal) entries.
3044 if Is_Task_Record_Type
(Rec_Type
) then
3046 -- In the case of the restricted run time the ATCB has already
3047 -- been preallocated.
3049 if Restricted_Profile
then
3051 Make_Assignment_Statement
(Loc
,
3053 Make_Selected_Component
(Loc
,
3054 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
3055 Selector_Name
=> Make_Identifier
(Loc
, Name_uTask_Id
)),
3057 Make_Attribute_Reference
(Loc
,
3059 Make_Selected_Component
(Loc
,
3060 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
3061 Selector_Name
=> Make_Identifier
(Loc
, Name_uATCB
)),
3062 Attribute_Name
=> Name_Unchecked_Access
)));
3065 Append_To
(Stmts
, Make_Task_Create_Call
(Rec_Type
));
3068 Task_Type
: constant Entity_Id
:=
3069 Corresponding_Concurrent_Type
(Rec_Type
);
3070 Task_Decl
: constant Node_Id
:= Parent
(Task_Type
);
3071 Task_Def
: constant Node_Id
:= Task_Definition
(Task_Decl
);
3072 Decl_Loc
: Source_Ptr
;
3077 if Present
(Task_Def
) then
3078 Vis_Decl
:= First
(Visible_Declarations
(Task_Def
));
3079 while Present
(Vis_Decl
) loop
3080 Decl_Loc
:= Sloc
(Vis_Decl
);
3082 if Nkind
(Vis_Decl
) = N_Attribute_Definition_Clause
then
3083 if Get_Attribute_Id
(Chars
(Vis_Decl
)) =
3086 Ent
:= Entity
(Name
(Vis_Decl
));
3088 if Ekind
(Ent
) = E_Entry
then
3090 Make_Procedure_Call_Statement
(Decl_Loc
,
3092 New_Occurrence_Of
(RTE
(
3093 RE_Bind_Interrupt_To_Entry
), Decl_Loc
),
3094 Parameter_Associations
=> New_List
(
3095 Make_Selected_Component
(Decl_Loc
,
3097 Make_Identifier
(Decl_Loc
, Name_uInit
),
3100 (Decl_Loc
, Name_uTask_Id
)),
3101 Entry_Index_Expression
3102 (Decl_Loc
, Ent
, Empty
, Task_Type
),
3103 Expression
(Vis_Decl
))));
3114 -- For a protected type, add statements generated by
3115 -- Make_Initialize_Protection.
3117 if Is_Protected_Record_Type
(Rec_Type
) then
3118 Append_List_To
(Stmts
,
3119 Make_Initialize_Protection
(Rec_Type
));
3122 -- Second pass: components with per-object constraints
3125 Decl
:= First_Non_Pragma
(Component_Items
(Comp_List
));
3126 while Present
(Decl
) loop
3127 Comp_Loc
:= Sloc
(Decl
);
3128 Id
:= Defining_Identifier
(Decl
);
3131 if Has_Access_Constraint
(Id
)
3132 and then No
(Expression
(Decl
))
3134 if Has_Non_Null_Base_Init_Proc
(Typ
) then
3135 Append_List_To
(Stmts
,
3136 Build_Initialization_Call
(Comp_Loc
,
3137 Make_Selected_Component
(Comp_Loc
,
3139 Make_Identifier
(Comp_Loc
, Name_uInit
),
3140 Selector_Name
=> New_Occurrence_Of
(Id
, Comp_Loc
)),
3142 In_Init_Proc
=> True,
3143 Enclos_Type
=> Rec_Type
,
3144 Discr_Map
=> Discr_Map
));
3146 Clean_Task_Names
(Typ
, Proc_Id
);
3148 -- Preserve initialization state in the current counter
3150 if Needs_Finalization
(Typ
) then
3151 if No
(Counter_Id
) then
3152 Make_Counter
(Comp_Loc
);
3155 Increment_Counter
(Comp_Loc
);
3158 elsif Component_Needs_Simple_Initialization
(Typ
) then
3159 Append_List_To
(Stmts
,
3161 (Id
, Get_Simple_Init_Val
(Typ
, N
, Esize
(Id
))));
3165 Next_Non_Pragma
(Decl
);
3169 -- Process the variant part
3171 if Present
(Variant_Part
(Comp_List
)) then
3173 Variant_Alts
: constant List_Id
:= New_List
;
3174 Var_Loc
: Source_Ptr
;
3179 First_Non_Pragma
(Variants
(Variant_Part
(Comp_List
)));
3180 while Present
(Variant
) loop
3181 Var_Loc
:= Sloc
(Variant
);
3182 Append_To
(Variant_Alts
,
3183 Make_Case_Statement_Alternative
(Var_Loc
,
3185 New_Copy_List
(Discrete_Choices
(Variant
)),
3187 Build_Init_Statements
(Component_List
(Variant
))));
3188 Next_Non_Pragma
(Variant
);
3191 -- The expression of the case statement which is a reference
3192 -- to one of the discriminants is replaced by the appropriate
3193 -- formal parameter of the initialization procedure.
3196 Make_Case_Statement
(Var_Loc
,
3198 New_Occurrence_Of
(Discriminal
(
3199 Entity
(Name
(Variant_Part
(Comp_List
)))), Var_Loc
),
3200 Alternatives
=> Variant_Alts
));
3204 -- If no initializations when generated for component declarations
3205 -- corresponding to this Stmts, append a null statement to Stmts to
3206 -- to make it a valid Ada tree.
3208 if Is_Empty_List
(Stmts
) then
3209 Append
(Make_Null_Statement
(Loc
), Stmts
);
3215 when RE_Not_Available
=>
3217 end Build_Init_Statements
;
3219 -------------------------
3220 -- Build_Record_Checks --
3221 -------------------------
3223 procedure Build_Record_Checks
(S
: Node_Id
; Check_List
: List_Id
) is
3224 Subtype_Mark_Id
: Entity_Id
;
3226 procedure Constrain_Array
3228 Check_List
: List_Id
);
3229 -- Apply a list of index constraints to an unconstrained array type.
3230 -- The first parameter is the entity for the resulting subtype.
3231 -- Check_List is a list to which the check actions are appended.
3233 ---------------------
3234 -- Constrain_Array --
3235 ---------------------
3237 procedure Constrain_Array
3239 Check_List
: List_Id
)
3241 C
: constant Node_Id
:= Constraint
(SI
);
3242 Number_Of_Constraints
: Nat
:= 0;
3246 procedure Constrain_Index
3249 Check_List
: List_Id
);
3250 -- Process an index constraint in a constrained array declaration.
3251 -- The constraint can be either a subtype name or a range with or
3252 -- without an explicit subtype mark. Index is the corresponding
3253 -- index of the unconstrained array. S is the range expression.
3254 -- Check_List is a list to which the check actions are appended.
3256 ---------------------
3257 -- Constrain_Index --
3258 ---------------------
3260 procedure Constrain_Index
3263 Check_List
: List_Id
)
3265 T
: constant Entity_Id
:= Etype
(Index
);
3268 if Nkind
(S
) = N_Range
then
3269 Process_Range_Expr_In_Decl
(S
, T
, Check_List
=> Check_List
);
3271 end Constrain_Index
;
3273 -- Start of processing for Constrain_Array
3276 T
:= Entity
(Subtype_Mark
(SI
));
3278 if Is_Access_Type
(T
) then
3279 T
:= Designated_Type
(T
);
3282 S
:= First
(Constraints
(C
));
3283 while Present
(S
) loop
3284 Number_Of_Constraints
:= Number_Of_Constraints
+ 1;
3288 -- In either case, the index constraint must provide a discrete
3289 -- range for each index of the array type and the type of each
3290 -- discrete range must be the same as that of the corresponding
3291 -- index. (RM 3.6.1)
3293 S
:= First
(Constraints
(C
));
3294 Index
:= First_Index
(T
);
3297 -- Apply constraints to each index type
3299 for J
in 1 .. Number_Of_Constraints
loop
3300 Constrain_Index
(Index
, S
, Check_List
);
3304 end Constrain_Array
;
3306 -- Start of processing for Build_Record_Checks
3309 if Nkind
(S
) = N_Subtype_Indication
then
3310 Find_Type
(Subtype_Mark
(S
));
3311 Subtype_Mark_Id
:= Entity
(Subtype_Mark
(S
));
3313 -- Remaining processing depends on type
3315 case Ekind
(Subtype_Mark_Id
) is
3318 Constrain_Array
(S
, Check_List
);
3324 end Build_Record_Checks
;
3326 -------------------------------------------
3327 -- Component_Needs_Simple_Initialization --
3328 -------------------------------------------
3330 function Component_Needs_Simple_Initialization
3331 (T
: Entity_Id
) return Boolean
3335 Needs_Simple_Initialization
(T
)
3336 and then not Is_RTE
(T
, RE_Tag
)
3338 -- Ada 2005 (AI-251): Check also the tag of abstract interfaces
3340 and then not Is_RTE
(T
, RE_Interface_Tag
);
3341 end Component_Needs_Simple_Initialization
;
3343 --------------------------------------
3344 -- Parent_Subtype_Renaming_Discrims --
3345 --------------------------------------
3347 function Parent_Subtype_Renaming_Discrims
return Boolean is
3352 if Base_Type
(Rec_Ent
) /= Rec_Ent
then
3356 if Etype
(Rec_Ent
) = Rec_Ent
3357 or else not Has_Discriminants
(Rec_Ent
)
3358 or else Is_Constrained
(Rec_Ent
)
3359 or else Is_Tagged_Type
(Rec_Ent
)
3364 -- If there are no explicit stored discriminants we have inherited
3365 -- the root type discriminants so far, so no renamings occurred.
3367 if First_Discriminant
(Rec_Ent
) =
3368 First_Stored_Discriminant
(Rec_Ent
)
3373 -- Check if we have done some trivial renaming of the parent
3374 -- discriminants, i.e. something like
3376 -- type DT (X1, X2: int) is new PT (X1, X2);
3378 De
:= First_Discriminant
(Rec_Ent
);
3379 Dp
:= First_Discriminant
(Etype
(Rec_Ent
));
3380 while Present
(De
) loop
3381 pragma Assert
(Present
(Dp
));
3383 if Corresponding_Discriminant
(De
) /= Dp
then
3387 Next_Discriminant
(De
);
3388 Next_Discriminant
(Dp
);
3391 return Present
(Dp
);
3392 end Parent_Subtype_Renaming_Discrims
;
3394 ------------------------
3395 -- Requires_Init_Proc --
3396 ------------------------
3398 function Requires_Init_Proc
(Rec_Id
: Entity_Id
) return Boolean is
3399 Comp_Decl
: Node_Id
;
3404 -- Definitely do not need one if specifically suppressed
3406 if Initialization_Suppressed
(Rec_Id
) then
3410 -- If it is a type derived from a type with unknown discriminants,
3411 -- we cannot build an initialization procedure for it.
3413 if Has_Unknown_Discriminants
(Rec_Id
)
3414 or else Has_Unknown_Discriminants
(Etype
(Rec_Id
))
3419 -- Otherwise we need to generate an initialization procedure if
3420 -- Is_CPP_Class is False and at least one of the following applies:
3422 -- 1. Discriminants are present, since they need to be initialized
3423 -- with the appropriate discriminant constraint expressions.
3424 -- However, the discriminant of an unchecked union does not
3425 -- count, since the discriminant is not present.
3427 -- 2. The type is a tagged type, since the implicit Tag component
3428 -- needs to be initialized with a pointer to the dispatch table.
3430 -- 3. The type contains tasks
3432 -- 4. One or more components has an initial value
3434 -- 5. One or more components is for a type which itself requires
3435 -- an initialization procedure.
3437 -- 6. One or more components is a type that requires simple
3438 -- initialization (see Needs_Simple_Initialization), except
3439 -- that types Tag and Interface_Tag are excluded, since fields
3440 -- of these types are initialized by other means.
3442 -- 7. The type is the record type built for a task type (since at
3443 -- the very least, Create_Task must be called)
3445 -- 8. The type is the record type built for a protected type (since
3446 -- at least Initialize_Protection must be called)
3448 -- 9. The type is marked as a public entity. The reason we add this
3449 -- case (even if none of the above apply) is to properly handle
3450 -- Initialize_Scalars. If a package is compiled without an IS
3451 -- pragma, and the client is compiled with an IS pragma, then
3452 -- the client will think an initialization procedure is present
3453 -- and call it, when in fact no such procedure is required, but
3454 -- since the call is generated, there had better be a routine
3455 -- at the other end of the call, even if it does nothing).
3457 -- Note: the reason we exclude the CPP_Class case is because in this
3458 -- case the initialization is performed by the C++ constructors, and
3459 -- the IP is built by Set_CPP_Constructors.
3461 if Is_CPP_Class
(Rec_Id
) then
3464 elsif Is_Interface
(Rec_Id
) then
3467 elsif (Has_Discriminants
(Rec_Id
)
3468 and then not Is_Unchecked_Union
(Rec_Id
))
3469 or else Is_Tagged_Type
(Rec_Id
)
3470 or else Is_Concurrent_Record_Type
(Rec_Id
)
3471 or else Has_Task
(Rec_Id
)
3476 Id
:= First_Component
(Rec_Id
);
3477 while Present
(Id
) loop
3478 Comp_Decl
:= Parent
(Id
);
3481 if Present
(Expression
(Comp_Decl
))
3482 or else Has_Non_Null_Base_Init_Proc
(Typ
)
3483 or else Component_Needs_Simple_Initialization
(Typ
)
3488 Next_Component
(Id
);
3491 -- As explained above, a record initialization procedure is needed
3492 -- for public types in case Initialize_Scalars applies to a client.
3493 -- However, such a procedure is not needed in the case where either
3494 -- of restrictions No_Initialize_Scalars or No_Default_Initialization
3495 -- applies. No_Initialize_Scalars excludes the possibility of using
3496 -- Initialize_Scalars in any partition, and No_Default_Initialization
3497 -- implies that no initialization should ever be done for objects of
3498 -- the type, so is incompatible with Initialize_Scalars.
3500 if not Restriction_Active
(No_Initialize_Scalars
)
3501 and then not Restriction_Active
(No_Default_Initialization
)
3502 and then Is_Public
(Rec_Id
)
3508 end Requires_Init_Proc
;
3510 -- Start of processing for Build_Record_Init_Proc
3513 Rec_Type
:= Defining_Identifier
(N
);
3515 -- This may be full declaration of a private type, in which case
3516 -- the visible entity is a record, and the private entity has been
3517 -- exchanged with it in the private part of the current package.
3518 -- The initialization procedure is built for the record type, which
3519 -- is retrievable from the private entity.
3521 if Is_Incomplete_Or_Private_Type
(Rec_Type
) then
3522 Rec_Type
:= Underlying_Type
(Rec_Type
);
3525 -- If we have a variant record with restriction No_Implicit_Conditionals
3526 -- in effect, then we skip building the procedure. This is safe because
3527 -- if we can see the restriction, so can any caller, calls to initialize
3528 -- such records are not allowed for variant records if this restriction
3531 if Has_Variant_Part
(Rec_Type
)
3532 and then Restriction_Active
(No_Implicit_Conditionals
)
3537 -- If there are discriminants, build the discriminant map to replace
3538 -- discriminants by their discriminals in complex bound expressions.
3539 -- These only arise for the corresponding records of synchronized types.
3541 if Is_Concurrent_Record_Type
(Rec_Type
)
3542 and then Has_Discriminants
(Rec_Type
)
3547 Disc
:= First_Discriminant
(Rec_Type
);
3548 while Present
(Disc
) loop
3549 Append_Elmt
(Disc
, Discr_Map
);
3550 Append_Elmt
(Discriminal
(Disc
), Discr_Map
);
3551 Next_Discriminant
(Disc
);
3556 -- Derived types that have no type extension can use the initialization
3557 -- procedure of their parent and do not need a procedure of their own.
3558 -- This is only correct if there are no representation clauses for the
3559 -- type or its parent, and if the parent has in fact been frozen so
3560 -- that its initialization procedure exists.
3562 if Is_Derived_Type
(Rec_Type
)
3563 and then not Is_Tagged_Type
(Rec_Type
)
3564 and then not Is_Unchecked_Union
(Rec_Type
)
3565 and then not Has_New_Non_Standard_Rep
(Rec_Type
)
3566 and then not Parent_Subtype_Renaming_Discrims
3567 and then Has_Non_Null_Base_Init_Proc
(Etype
(Rec_Type
))
3569 Copy_TSS
(Base_Init_Proc
(Etype
(Rec_Type
)), Rec_Type
);
3571 -- Otherwise if we need an initialization procedure, then build one,
3572 -- mark it as public and inlinable and as having a completion.
3574 elsif Requires_Init_Proc
(Rec_Type
)
3575 or else Is_Unchecked_Union
(Rec_Type
)
3578 Make_Defining_Identifier
(Loc
,
3579 Chars
=> Make_Init_Proc_Name
(Rec_Type
));
3581 -- If No_Default_Initialization restriction is active, then we don't
3582 -- want to build an init_proc, but we need to mark that an init_proc
3583 -- would be needed if this restriction was not active (so that we can
3584 -- detect attempts to call it), so set a dummy init_proc in place.
3586 if Restriction_Active
(No_Default_Initialization
) then
3587 Set_Init_Proc
(Rec_Type
, Proc_Id
);
3591 Build_Offset_To_Top_Functions
;
3592 Build_CPP_Init_Procedure
;
3593 Build_Init_Procedure
;
3595 Set_Is_Public
(Proc_Id
, Is_Public
(Rec_Ent
));
3596 Set_Is_Internal
(Proc_Id
);
3597 Set_Has_Completion
(Proc_Id
);
3599 if not Debug_Generated_Code
then
3600 Set_Debug_Info_Off
(Proc_Id
);
3603 Set_Is_Inlined
(Proc_Id
, Inline_Init_Proc
(Rec_Type
));
3605 -- Do not build an aggregate if Modify_Tree_For_C, this isn't
3606 -- needed and may generate early references to non frozen types
3607 -- since we expand aggregate much more systematically.
3609 if Modify_Tree_For_C
then
3614 Agg
: constant Node_Id
:=
3615 Build_Equivalent_Record_Aggregate
(Rec_Type
);
3617 procedure Collect_Itypes
(Comp
: Node_Id
);
3618 -- Generate references to itypes in the aggregate, because
3619 -- the first use of the aggregate may be in a nested scope.
3621 --------------------
3622 -- Collect_Itypes --
3623 --------------------
3625 procedure Collect_Itypes
(Comp
: Node_Id
) is
3628 Typ
: constant Entity_Id
:= Etype
(Comp
);
3631 if Is_Array_Type
(Typ
) and then Is_Itype
(Typ
) then
3632 Ref
:= Make_Itype_Reference
(Loc
);
3633 Set_Itype
(Ref
, Typ
);
3634 Append_Freeze_Action
(Rec_Type
, Ref
);
3636 Ref
:= Make_Itype_Reference
(Loc
);
3637 Set_Itype
(Ref
, Etype
(First_Index
(Typ
)));
3638 Append_Freeze_Action
(Rec_Type
, Ref
);
3640 -- Recurse on nested arrays
3642 Sub_Aggr
:= First
(Expressions
(Comp
));
3643 while Present
(Sub_Aggr
) loop
3644 Collect_Itypes
(Sub_Aggr
);
3651 -- If there is a static initialization aggregate for the type,
3652 -- generate itype references for the types of its (sub)components,
3653 -- to prevent out-of-scope errors in the resulting tree.
3654 -- The aggregate may have been rewritten as a Raise node, in which
3655 -- case there are no relevant itypes.
3657 if Present
(Agg
) and then Nkind
(Agg
) = N_Aggregate
then
3658 Set_Static_Initialization
(Proc_Id
, Agg
);
3663 Comp
:= First
(Component_Associations
(Agg
));
3664 while Present
(Comp
) loop
3665 Collect_Itypes
(Expression
(Comp
));
3672 end Build_Record_Init_Proc
;
3674 --------------------------------
3675 -- Build_Record_Invariant_Proc --
3676 --------------------------------
3678 function Build_Record_Invariant_Proc
3679 (R_Type
: Entity_Id
;
3680 Nod
: Node_Id
) return Node_Id
3682 Loc
: constant Source_Ptr
:= Sloc
(Nod
);
3684 Object_Name
: constant Name_Id
:= New_Internal_Name
('I');
3685 -- Name for argument of invariant procedure
3687 Object_Entity
: constant Node_Id
:=
3688 Make_Defining_Identifier
(Loc
, Object_Name
);
3689 -- The procedure declaration entity for the argument
3691 Invariant_Found
: Boolean;
3692 -- Set if any component needs an invariant check.
3694 Proc_Id
: Entity_Id
;
3695 Proc_Body
: Node_Id
;
3699 function Build_Invariant_Checks
(Comp_List
: Node_Id
) return List_Id
;
3700 -- Recursive procedure that generates a list of checks for components
3701 -- that need it, and recurses through variant parts when present.
3703 function Build_Component_Invariant_Call
(Comp
: Entity_Id
)
3705 -- Build call to invariant procedure for a record component.
3707 ------------------------------------
3708 -- Build_Component_Invariant_Call --
3709 ------------------------------------
3711 function Build_Component_Invariant_Call
(Comp
: Entity_Id
)
3719 Invariant_Found
:= True;
3720 Typ
:= Etype
(Comp
);
3723 Make_Selected_Component
(Loc
,
3724 Prefix
=> New_Occurrence_Of
(Object_Entity
, Loc
),
3725 Selector_Name
=> New_Occurrence_Of
(Comp
, Loc
));
3727 if Is_Access_Type
(Typ
) then
3729 -- If the access component designates a type with an invariant,
3730 -- the check applies to the designated object. The access type
3731 -- itself may have an invariant, in which case it applies to the
3732 -- access value directly.
3734 -- Note: we are assuming that invariants will not occur on both
3735 -- the access type and the type that it designates. This is not
3736 -- really justified but it is hard to imagine that this case will
3737 -- ever cause trouble ???
3739 if not (Has_Invariants
(Typ
)) then
3740 Sel_Comp
:= Make_Explicit_Dereference
(Loc
, Sel_Comp
);
3741 Typ
:= Designated_Type
(Typ
);
3745 -- The aspect is type-specific, so retrieve it from the base type
3748 Make_Procedure_Call_Statement
(Loc
,
3750 New_Occurrence_Of
(Invariant_Procedure
(Base_Type
(Typ
)), Loc
),
3751 Parameter_Associations
=> New_List
(Sel_Comp
));
3753 if Is_Access_Type
(Etype
(Comp
)) then
3755 Make_If_Statement
(Loc
,
3758 Left_Opnd
=> Make_Null
(Loc
),
3760 Make_Selected_Component
(Loc
,
3761 Prefix
=> New_Occurrence_Of
(Object_Entity
, Loc
),
3762 Selector_Name
=> New_Occurrence_Of
(Comp
, Loc
))),
3763 Then_Statements
=> New_List
(Call
));
3767 end Build_Component_Invariant_Call
;
3769 ----------------------------
3770 -- Build_Invariant_Checks --
3771 ----------------------------
3773 function Build_Invariant_Checks
(Comp_List
: Node_Id
) return List_Id
is
3780 Decl
:= First_Non_Pragma
(Component_Items
(Comp_List
));
3781 while Present
(Decl
) loop
3782 if Nkind
(Decl
) = N_Component_Declaration
then
3783 Id
:= Defining_Identifier
(Decl
);
3785 if Has_Invariants
(Etype
(Id
))
3786 and then In_Open_Scopes
(Scope
(R_Type
))
3788 if Has_Unchecked_Union
(R_Type
) then
3790 ("invariants cannot be checked on components of "
3791 & "unchecked_union type&?", Decl
, R_Type
);
3795 Append_To
(Stmts
, Build_Component_Invariant_Call
(Id
));
3798 elsif Is_Access_Type
(Etype
(Id
))
3799 and then not Is_Access_Constant
(Etype
(Id
))
3800 and then Has_Invariants
(Designated_Type
(Etype
(Id
)))
3801 and then In_Open_Scopes
(Scope
(Designated_Type
(Etype
(Id
))))
3803 Append_To
(Stmts
, Build_Component_Invariant_Call
(Id
));
3810 if Present
(Variant_Part
(Comp_List
)) then
3812 Variant_Alts
: constant List_Id
:= New_List
;
3813 Var_Loc
: Source_Ptr
;
3815 Variant_Stmts
: List_Id
;
3819 First_Non_Pragma
(Variants
(Variant_Part
(Comp_List
)));
3820 while Present
(Variant
) loop
3822 Build_Invariant_Checks
(Component_List
(Variant
));
3823 Var_Loc
:= Sloc
(Variant
);
3824 Append_To
(Variant_Alts
,
3825 Make_Case_Statement_Alternative
(Var_Loc
,
3827 New_Copy_List
(Discrete_Choices
(Variant
)),
3828 Statements
=> Variant_Stmts
));
3830 Next_Non_Pragma
(Variant
);
3833 -- The expression in the case statement is the reference to
3834 -- the discriminant of the target object.
3837 Make_Case_Statement
(Var_Loc
,
3839 Make_Selected_Component
(Var_Loc
,
3840 Prefix
=> New_Occurrence_Of
(Object_Entity
, Var_Loc
),
3841 Selector_Name
=> New_Occurrence_Of
3843 (Name
(Variant_Part
(Comp_List
))), Var_Loc
)),
3844 Alternatives
=> Variant_Alts
));
3849 end Build_Invariant_Checks
;
3851 -- Start of processing for Build_Record_Invariant_Proc
3854 Invariant_Found
:= False;
3855 Type_Def
:= Type_Definition
(Parent
(R_Type
));
3857 if Nkind
(Type_Def
) = N_Record_Definition
3858 and then not Null_Present
(Type_Def
)
3860 Stmts
:= Build_Invariant_Checks
(Component_List
(Type_Def
));
3865 if not Invariant_Found
then
3869 -- The name of the invariant procedure reflects the fact that the
3870 -- checks correspond to invariants on the component types. The
3871 -- record type itself may have invariants that will create a separate
3872 -- procedure whose name carries the Invariant suffix.
3875 Make_Defining_Identifier
(Loc
,
3876 Chars
=> New_External_Name
(Chars
(R_Type
), "CInvariant"));
3879 Make_Subprogram_Body
(Loc
,
3881 Make_Procedure_Specification
(Loc
,
3882 Defining_Unit_Name
=> Proc_Id
,
3883 Parameter_Specifications
=> New_List
(
3884 Make_Parameter_Specification
(Loc
,
3885 Defining_Identifier
=> Object_Entity
,
3886 Parameter_Type
=> New_Occurrence_Of
(R_Type
, Loc
)))),
3888 Declarations
=> Empty_List
,
3889 Handled_Statement_Sequence
=>
3890 Make_Handled_Sequence_Of_Statements
(Loc
,
3891 Statements
=> Stmts
));
3893 Set_Ekind
(Proc_Id
, E_Procedure
);
3894 Set_Is_Public
(Proc_Id
, Is_Public
(R_Type
));
3895 Set_Is_Internal
(Proc_Id
);
3896 Set_Has_Completion
(Proc_Id
);
3899 -- Insert_After (Nod, Proc_Body);
3900 -- Analyze (Proc_Body);
3901 end Build_Record_Invariant_Proc
;
3903 ----------------------------
3904 -- Build_Slice_Assignment --
3905 ----------------------------
3907 -- Generates the following subprogram:
3910 -- (Source, Target : Array_Type,
3911 -- Left_Lo, Left_Hi : Index;
3912 -- Right_Lo, Right_Hi : Index;
3920 -- if Left_Hi < Left_Lo then
3933 -- Target (Li1) := Source (Ri1);
3936 -- exit when Li1 = Left_Lo;
3937 -- Li1 := Index'pred (Li1);
3938 -- Ri1 := Index'pred (Ri1);
3940 -- exit when Li1 = Left_Hi;
3941 -- Li1 := Index'succ (Li1);
3942 -- Ri1 := Index'succ (Ri1);
3947 procedure Build_Slice_Assignment
(Typ
: Entity_Id
) is
3948 Loc
: constant Source_Ptr
:= Sloc
(Typ
);
3949 Index
: constant Entity_Id
:= Base_Type
(Etype
(First_Index
(Typ
)));
3951 Larray
: constant Entity_Id
:= Make_Temporary
(Loc
, 'A');
3952 Rarray
: constant Entity_Id
:= Make_Temporary
(Loc
, 'R');
3953 Left_Lo
: constant Entity_Id
:= Make_Temporary
(Loc
, 'L');
3954 Left_Hi
: constant Entity_Id
:= Make_Temporary
(Loc
, 'L');
3955 Right_Lo
: constant Entity_Id
:= Make_Temporary
(Loc
, 'R');
3956 Right_Hi
: constant Entity_Id
:= Make_Temporary
(Loc
, 'R');
3957 Rev
: constant Entity_Id
:= Make_Temporary
(Loc
, 'D');
3958 -- Formal parameters of procedure
3960 Proc_Name
: constant Entity_Id
:=
3961 Make_Defining_Identifier
(Loc
,
3962 Chars
=> Make_TSS_Name
(Typ
, TSS_Slice_Assign
));
3964 Lnn
: constant Entity_Id
:= Make_Temporary
(Loc
, 'L');
3965 Rnn
: constant Entity_Id
:= Make_Temporary
(Loc
, 'R');
3966 -- Subscripts for left and right sides
3973 -- Build declarations for indexes
3978 Make_Object_Declaration
(Loc
,
3979 Defining_Identifier
=> Lnn
,
3980 Object_Definition
=>
3981 New_Occurrence_Of
(Index
, Loc
)));
3984 Make_Object_Declaration
(Loc
,
3985 Defining_Identifier
=> Rnn
,
3986 Object_Definition
=>
3987 New_Occurrence_Of
(Index
, Loc
)));
3991 -- Build test for empty slice case
3994 Make_If_Statement
(Loc
,
3997 Left_Opnd
=> New_Occurrence_Of
(Left_Hi
, Loc
),
3998 Right_Opnd
=> New_Occurrence_Of
(Left_Lo
, Loc
)),
3999 Then_Statements
=> New_List
(Make_Simple_Return_Statement
(Loc
))));
4001 -- Build initializations for indexes
4004 F_Init
: constant List_Id
:= New_List
;
4005 B_Init
: constant List_Id
:= New_List
;
4009 Make_Assignment_Statement
(Loc
,
4010 Name
=> New_Occurrence_Of
(Lnn
, Loc
),
4011 Expression
=> New_Occurrence_Of
(Left_Lo
, Loc
)));
4014 Make_Assignment_Statement
(Loc
,
4015 Name
=> New_Occurrence_Of
(Rnn
, Loc
),
4016 Expression
=> New_Occurrence_Of
(Right_Lo
, Loc
)));
4019 Make_Assignment_Statement
(Loc
,
4020 Name
=> New_Occurrence_Of
(Lnn
, Loc
),
4021 Expression
=> New_Occurrence_Of
(Left_Hi
, Loc
)));
4024 Make_Assignment_Statement
(Loc
,
4025 Name
=> New_Occurrence_Of
(Rnn
, Loc
),
4026 Expression
=> New_Occurrence_Of
(Right_Hi
, Loc
)));
4029 Make_If_Statement
(Loc
,
4030 Condition
=> New_Occurrence_Of
(Rev
, Loc
),
4031 Then_Statements
=> B_Init
,
4032 Else_Statements
=> F_Init
));
4035 -- Now construct the assignment statement
4038 Make_Loop_Statement
(Loc
,
4039 Statements
=> New_List
(
4040 Make_Assignment_Statement
(Loc
,
4042 Make_Indexed_Component
(Loc
,
4043 Prefix
=> New_Occurrence_Of
(Larray
, Loc
),
4044 Expressions
=> New_List
(New_Occurrence_Of
(Lnn
, Loc
))),
4046 Make_Indexed_Component
(Loc
,
4047 Prefix
=> New_Occurrence_Of
(Rarray
, Loc
),
4048 Expressions
=> New_List
(New_Occurrence_Of
(Rnn
, Loc
))))),
4049 End_Label
=> Empty
);
4051 -- Build the exit condition and increment/decrement statements
4054 F_Ass
: constant List_Id
:= New_List
;
4055 B_Ass
: constant List_Id
:= New_List
;
4059 Make_Exit_Statement
(Loc
,
4062 Left_Opnd
=> New_Occurrence_Of
(Lnn
, Loc
),
4063 Right_Opnd
=> New_Occurrence_Of
(Left_Hi
, Loc
))));
4066 Make_Assignment_Statement
(Loc
,
4067 Name
=> New_Occurrence_Of
(Lnn
, Loc
),
4069 Make_Attribute_Reference
(Loc
,
4071 New_Occurrence_Of
(Index
, Loc
),
4072 Attribute_Name
=> Name_Succ
,
4073 Expressions
=> New_List
(
4074 New_Occurrence_Of
(Lnn
, Loc
)))));
4077 Make_Assignment_Statement
(Loc
,
4078 Name
=> New_Occurrence_Of
(Rnn
, Loc
),
4080 Make_Attribute_Reference
(Loc
,
4082 New_Occurrence_Of
(Index
, Loc
),
4083 Attribute_Name
=> Name_Succ
,
4084 Expressions
=> New_List
(
4085 New_Occurrence_Of
(Rnn
, Loc
)))));
4088 Make_Exit_Statement
(Loc
,
4091 Left_Opnd
=> New_Occurrence_Of
(Lnn
, Loc
),
4092 Right_Opnd
=> New_Occurrence_Of
(Left_Lo
, Loc
))));
4095 Make_Assignment_Statement
(Loc
,
4096 Name
=> New_Occurrence_Of
(Lnn
, Loc
),
4098 Make_Attribute_Reference
(Loc
,
4100 New_Occurrence_Of
(Index
, Loc
),
4101 Attribute_Name
=> Name_Pred
,
4102 Expressions
=> New_List
(
4103 New_Occurrence_Of
(Lnn
, Loc
)))));
4106 Make_Assignment_Statement
(Loc
,
4107 Name
=> New_Occurrence_Of
(Rnn
, Loc
),
4109 Make_Attribute_Reference
(Loc
,
4111 New_Occurrence_Of
(Index
, Loc
),
4112 Attribute_Name
=> Name_Pred
,
4113 Expressions
=> New_List
(
4114 New_Occurrence_Of
(Rnn
, Loc
)))));
4116 Append_To
(Statements
(Loops
),
4117 Make_If_Statement
(Loc
,
4118 Condition
=> New_Occurrence_Of
(Rev
, Loc
),
4119 Then_Statements
=> B_Ass
,
4120 Else_Statements
=> F_Ass
));
4123 Append_To
(Stats
, Loops
);
4127 Formals
: List_Id
:= New_List
;
4130 Formals
:= New_List
(
4131 Make_Parameter_Specification
(Loc
,
4132 Defining_Identifier
=> Larray
,
4133 Out_Present
=> True,
4135 New_Occurrence_Of
(Base_Type
(Typ
), Loc
)),
4137 Make_Parameter_Specification
(Loc
,
4138 Defining_Identifier
=> Rarray
,
4140 New_Occurrence_Of
(Base_Type
(Typ
), Loc
)),
4142 Make_Parameter_Specification
(Loc
,
4143 Defining_Identifier
=> Left_Lo
,
4145 New_Occurrence_Of
(Index
, Loc
)),
4147 Make_Parameter_Specification
(Loc
,
4148 Defining_Identifier
=> Left_Hi
,
4150 New_Occurrence_Of
(Index
, Loc
)),
4152 Make_Parameter_Specification
(Loc
,
4153 Defining_Identifier
=> Right_Lo
,
4155 New_Occurrence_Of
(Index
, Loc
)),
4157 Make_Parameter_Specification
(Loc
,
4158 Defining_Identifier
=> Right_Hi
,
4160 New_Occurrence_Of
(Index
, Loc
)));
4163 Make_Parameter_Specification
(Loc
,
4164 Defining_Identifier
=> Rev
,
4166 New_Occurrence_Of
(Standard_Boolean
, Loc
)));
4169 Make_Procedure_Specification
(Loc
,
4170 Defining_Unit_Name
=> Proc_Name
,
4171 Parameter_Specifications
=> Formals
);
4174 Make_Subprogram_Body
(Loc
,
4175 Specification
=> Spec
,
4176 Declarations
=> Decls
,
4177 Handled_Statement_Sequence
=>
4178 Make_Handled_Sequence_Of_Statements
(Loc
,
4179 Statements
=> Stats
)));
4182 Set_TSS
(Typ
, Proc_Name
);
4183 Set_Is_Pure
(Proc_Name
);
4184 end Build_Slice_Assignment
;
4186 -----------------------------
4187 -- Build_Untagged_Equality --
4188 -----------------------------
4190 procedure Build_Untagged_Equality
(Typ
: Entity_Id
) is
4198 function User_Defined_Eq
(T
: Entity_Id
) return Entity_Id
;
4199 -- Check whether the type T has a user-defined primitive equality. If so
4200 -- return it, else return Empty. If true for a component of Typ, we have
4201 -- to build the primitive equality for it.
4203 ---------------------
4204 -- User_Defined_Eq --
4205 ---------------------
4207 function User_Defined_Eq
(T
: Entity_Id
) return Entity_Id
is
4212 Op
:= TSS
(T
, TSS_Composite_Equality
);
4214 if Present
(Op
) then
4218 Prim
:= First_Elmt
(Collect_Primitive_Operations
(T
));
4219 while Present
(Prim
) loop
4222 if Chars
(Op
) = Name_Op_Eq
4223 and then Etype
(Op
) = Standard_Boolean
4224 and then Etype
(First_Formal
(Op
)) = T
4225 and then Etype
(Next_Formal
(First_Formal
(Op
))) = T
4234 end User_Defined_Eq
;
4236 -- Start of processing for Build_Untagged_Equality
4239 -- If a record component has a primitive equality operation, we must
4240 -- build the corresponding one for the current type.
4243 Comp
:= First_Component
(Typ
);
4244 while Present
(Comp
) loop
4245 if Is_Record_Type
(Etype
(Comp
))
4246 and then Present
(User_Defined_Eq
(Etype
(Comp
)))
4251 Next_Component
(Comp
);
4254 -- If there is a user-defined equality for the type, we do not create
4255 -- the implicit one.
4257 Prim
:= First_Elmt
(Collect_Primitive_Operations
(Typ
));
4259 while Present
(Prim
) loop
4260 if Chars
(Node
(Prim
)) = Name_Op_Eq
4261 and then Comes_From_Source
(Node
(Prim
))
4263 -- Don't we also need to check formal types and return type as in
4264 -- User_Defined_Eq above???
4267 Eq_Op
:= Node
(Prim
);
4275 -- If the type is derived, inherit the operation, if present, from the
4276 -- parent type. It may have been declared after the type derivation. If
4277 -- the parent type itself is derived, it may have inherited an operation
4278 -- that has itself been overridden, so update its alias and related
4279 -- flags. Ditto for inequality.
4281 if No
(Eq_Op
) and then Is_Derived_Type
(Typ
) then
4282 Prim
:= First_Elmt
(Collect_Primitive_Operations
(Etype
(Typ
)));
4283 while Present
(Prim
) loop
4284 if Chars
(Node
(Prim
)) = Name_Op_Eq
then
4285 Copy_TSS
(Node
(Prim
), Typ
);
4289 Op
: constant Entity_Id
:= User_Defined_Eq
(Typ
);
4290 Eq_Op
: constant Entity_Id
:= Node
(Prim
);
4291 NE_Op
: constant Entity_Id
:= Next_Entity
(Eq_Op
);
4294 if Present
(Op
) then
4295 Set_Alias
(Op
, Eq_Op
);
4296 Set_Is_Abstract_Subprogram
4297 (Op
, Is_Abstract_Subprogram
(Eq_Op
));
4299 if Chars
(Next_Entity
(Op
)) = Name_Op_Ne
then
4300 Set_Is_Abstract_Subprogram
4301 (Next_Entity
(Op
), Is_Abstract_Subprogram
(NE_Op
));
4313 -- If not inherited and not user-defined, build body as for a type with
4314 -- tagged components.
4318 Make_Eq_Body
(Typ
, Make_TSS_Name
(Typ
, TSS_Composite_Equality
));
4319 Op
:= Defining_Entity
(Decl
);
4323 if Is_Library_Level_Entity
(Typ
) then
4327 end Build_Untagged_Equality
;
4329 -----------------------------------
4330 -- Build_Variant_Record_Equality --
4331 -----------------------------------
4335 -- function _Equality (X, Y : T) return Boolean is
4337 -- -- Compare discriminants
4339 -- if X.D1 /= Y.D1 or else X.D2 /= Y.D2 or else ... then
4343 -- -- Compare components
4345 -- if X.C1 /= Y.C1 or else X.C2 /= Y.C2 or else ... then
4349 -- -- Compare variant part
4353 -- if X.C2 /= Y.C2 or else X.C3 /= Y.C3 or else ... then
4358 -- if X.Cn /= Y.Cn or else ... then
4366 procedure Build_Variant_Record_Equality
(Typ
: Entity_Id
) is
4367 Loc
: constant Source_Ptr
:= Sloc
(Typ
);
4369 F
: constant Entity_Id
:=
4370 Make_Defining_Identifier
(Loc
,
4371 Chars
=> Make_TSS_Name
(Typ
, TSS_Composite_Equality
));
4373 X
: constant Entity_Id
:= Make_Defining_Identifier
(Loc
, Name_X
);
4374 Y
: constant Entity_Id
:= Make_Defining_Identifier
(Loc
, Name_Y
);
4376 Def
: constant Node_Id
:= Parent
(Typ
);
4377 Comps
: constant Node_Id
:= Component_List
(Type_Definition
(Def
));
4378 Stmts
: constant List_Id
:= New_List
;
4379 Pspecs
: constant List_Id
:= New_List
;
4382 -- If we have a variant record with restriction No_Implicit_Conditionals
4383 -- in effect, then we skip building the procedure. This is safe because
4384 -- if we can see the restriction, so can any caller, calls to equality
4385 -- test routines are not allowed for variant records if this restriction
4388 if Restriction_Active
(No_Implicit_Conditionals
) then
4392 -- Derived Unchecked_Union types no longer inherit the equality function
4395 if Is_Derived_Type
(Typ
)
4396 and then not Is_Unchecked_Union
(Typ
)
4397 and then not Has_New_Non_Standard_Rep
(Typ
)
4400 Parent_Eq
: constant Entity_Id
:=
4401 TSS
(Root_Type
(Typ
), TSS_Composite_Equality
);
4403 if Present
(Parent_Eq
) then
4404 Copy_TSS
(Parent_Eq
, Typ
);
4411 Make_Subprogram_Body
(Loc
,
4413 Make_Function_Specification
(Loc
,
4414 Defining_Unit_Name
=> F
,
4415 Parameter_Specifications
=> Pspecs
,
4416 Result_Definition
=> New_Occurrence_Of
(Standard_Boolean
, Loc
)),
4417 Declarations
=> New_List
,
4418 Handled_Statement_Sequence
=>
4419 Make_Handled_Sequence_Of_Statements
(Loc
, Statements
=> Stmts
)));
4422 Make_Parameter_Specification
(Loc
,
4423 Defining_Identifier
=> X
,
4424 Parameter_Type
=> New_Occurrence_Of
(Typ
, Loc
)));
4427 Make_Parameter_Specification
(Loc
,
4428 Defining_Identifier
=> Y
,
4429 Parameter_Type
=> New_Occurrence_Of
(Typ
, Loc
)));
4431 -- Unchecked_Unions require additional machinery to support equality.
4432 -- Two extra parameters (A and B) are added to the equality function
4433 -- parameter list for each discriminant of the type, in order to
4434 -- capture the inferred values of the discriminants in equality calls.
4435 -- The names of the parameters match the names of the corresponding
4436 -- discriminant, with an added suffix.
4438 if Is_Unchecked_Union
(Typ
) then
4441 Discr_Type
: Entity_Id
;
4443 New_Discrs
: Elist_Id
;
4446 New_Discrs
:= New_Elmt_List
;
4448 Discr
:= First_Discriminant
(Typ
);
4449 while Present
(Discr
) loop
4450 Discr_Type
:= Etype
(Discr
);
4451 A
:= Make_Defining_Identifier
(Loc
,
4452 Chars
=> New_External_Name
(Chars
(Discr
), 'A'));
4454 B
:= Make_Defining_Identifier
(Loc
,
4455 Chars
=> New_External_Name
(Chars
(Discr
), 'B'));
4457 -- Add new parameters to the parameter list
4460 Make_Parameter_Specification
(Loc
,
4461 Defining_Identifier
=> A
,
4463 New_Occurrence_Of
(Discr_Type
, Loc
)));
4466 Make_Parameter_Specification
(Loc
,
4467 Defining_Identifier
=> B
,
4469 New_Occurrence_Of
(Discr_Type
, Loc
)));
4471 Append_Elmt
(A
, New_Discrs
);
4473 -- Generate the following code to compare each of the inferred
4481 Make_If_Statement
(Loc
,
4484 Left_Opnd
=> New_Occurrence_Of
(A
, Loc
),
4485 Right_Opnd
=> New_Occurrence_Of
(B
, Loc
)),
4486 Then_Statements
=> New_List
(
4487 Make_Simple_Return_Statement
(Loc
,
4489 New_Occurrence_Of
(Standard_False
, Loc
)))));
4490 Next_Discriminant
(Discr
);
4493 -- Generate component-by-component comparison. Note that we must
4494 -- propagate the inferred discriminants formals to act as
4495 -- the case statement switch. Their value is added when an
4496 -- equality call on unchecked unions is expanded.
4498 Append_List_To
(Stmts
, Make_Eq_Case
(Typ
, Comps
, New_Discrs
));
4501 -- Normal case (not unchecked union)
4505 Make_Eq_If
(Typ
, Discriminant_Specifications
(Def
)));
4506 Append_List_To
(Stmts
, Make_Eq_Case
(Typ
, Comps
));
4510 Make_Simple_Return_Statement
(Loc
,
4511 Expression
=> New_Occurrence_Of
(Standard_True
, Loc
)));
4516 if not Debug_Generated_Code
then
4517 Set_Debug_Info_Off
(F
);
4519 end Build_Variant_Record_Equality
;
4521 -----------------------------
4522 -- Check_Stream_Attributes --
4523 -----------------------------
4525 procedure Check_Stream_Attributes
(Typ
: Entity_Id
) is
4527 Par_Read
: constant Boolean :=
4528 Stream_Attribute_Available
(Typ
, TSS_Stream_Read
)
4529 and then not Has_Specified_Stream_Read
(Typ
);
4530 Par_Write
: constant Boolean :=
4531 Stream_Attribute_Available
(Typ
, TSS_Stream_Write
)
4532 and then not Has_Specified_Stream_Write
(Typ
);
4534 procedure Check_Attr
(Nam
: Name_Id
; TSS_Nam
: TSS_Name_Type
);
4535 -- Check that Comp has a user-specified Nam stream attribute
4541 procedure Check_Attr
(Nam
: Name_Id
; TSS_Nam
: TSS_Name_Type
) is
4543 if not Stream_Attribute_Available
(Etype
(Comp
), TSS_Nam
) then
4544 Error_Msg_Name_1
:= Nam
;
4546 ("|component& in limited extension must have% attribute", Comp
);
4550 -- Start of processing for Check_Stream_Attributes
4553 if Par_Read
or else Par_Write
then
4554 Comp
:= First_Component
(Typ
);
4555 while Present
(Comp
) loop
4556 if Comes_From_Source
(Comp
)
4557 and then Original_Record_Component
(Comp
) = Comp
4558 and then Is_Limited_Type
(Etype
(Comp
))
4561 Check_Attr
(Name_Read
, TSS_Stream_Read
);
4565 Check_Attr
(Name_Write
, TSS_Stream_Write
);
4569 Next_Component
(Comp
);
4572 end Check_Stream_Attributes
;
4574 ----------------------
4575 -- Clean_Task_Names --
4576 ----------------------
4578 procedure Clean_Task_Names
4580 Proc_Id
: Entity_Id
)
4584 and then not Restriction_Active
(No_Implicit_Heap_Allocations
)
4585 and then not Global_Discard_Names
4586 and then Tagged_Type_Expansion
4588 Set_Uses_Sec_Stack
(Proc_Id
);
4590 end Clean_Task_Names
;
4592 ------------------------------
4593 -- Expand_Freeze_Array_Type --
4594 ------------------------------
4596 procedure Expand_Freeze_Array_Type
(N
: Node_Id
) is
4597 Typ
: constant Entity_Id
:= Entity
(N
);
4598 Base
: constant Entity_Id
:= Base_Type
(Typ
);
4599 Comp_Typ
: constant Entity_Id
:= Component_Type
(Typ
);
4601 Save_Ghost_Mode
: constant Ghost_Mode_Type
:= Ghost_Mode
;
4604 -- Ensure that all freezing activities are properly flagged as Ghost
4606 Set_Ghost_Mode_From_Entity
(Typ
);
4608 if not Is_Bit_Packed_Array
(Typ
) then
4610 -- If the component contains tasks, so does the array type. This may
4611 -- not be indicated in the array type because the component may have
4612 -- been a private type at the point of definition. Same if component
4613 -- type is controlled or contains protected objects.
4615 Set_Has_Task
(Base
, Has_Task
(Comp_Typ
));
4616 Set_Has_Protected
(Base
, Has_Protected
(Comp_Typ
));
4617 Set_Has_Controlled_Component
4618 (Base
, Has_Controlled_Component
4621 Is_Controlled
(Comp_Typ
));
4623 if No
(Init_Proc
(Base
)) then
4625 -- If this is an anonymous array created for a declaration with
4626 -- an initial value, its init_proc will never be called. The
4627 -- initial value itself may have been expanded into assignments,
4628 -- in which case the object declaration is carries the
4629 -- No_Initialization flag.
4632 and then Nkind
(Associated_Node_For_Itype
(Base
)) =
4633 N_Object_Declaration
4635 (Present
(Expression
(Associated_Node_For_Itype
(Base
)))
4636 or else No_Initialization
(Associated_Node_For_Itype
(Base
)))
4640 -- We do not need an init proc for string or wide [wide] string,
4641 -- since the only time these need initialization in normalize or
4642 -- initialize scalars mode, and these types are treated specially
4643 -- and do not need initialization procedures.
4645 elsif Is_Standard_String_Type
(Base
) then
4648 -- Otherwise we have to build an init proc for the subtype
4651 Build_Array_Init_Proc
(Base
, N
);
4655 if Typ
= Base
and then Has_Controlled_Component
(Base
) then
4656 Build_Controlling_Procs
(Base
);
4658 if not Is_Limited_Type
(Comp_Typ
)
4659 and then Number_Dimensions
(Typ
) = 1
4661 Build_Slice_Assignment
(Typ
);
4665 -- For packed case, default initialization, except if the component type
4666 -- is itself a packed structure with an initialization procedure, or
4667 -- initialize/normalize scalars active, and we have a base type, or the
4668 -- type is public, because in that case a client might specify
4669 -- Normalize_Scalars and there better be a public Init_Proc for it.
4671 elsif (Present
(Init_Proc
(Component_Type
(Base
)))
4672 and then No
(Base_Init_Proc
(Base
)))
4673 or else (Init_Or_Norm_Scalars
and then Base
= Typ
)
4674 or else Is_Public
(Typ
)
4676 Build_Array_Init_Proc
(Base
, N
);
4679 if Has_Invariants
(Component_Type
(Base
))
4681 and then In_Open_Scopes
(Scope
(Component_Type
(Base
)))
4683 -- Generate component invariant checking procedure. This is only
4684 -- relevant if the array type is within the scope of the component
4685 -- type. Otherwise an array object can only be built using the public
4686 -- subprograms for the component type, and calls to those will have
4687 -- invariant checks. The invariant procedure is only generated for
4688 -- a base type, not a subtype.
4690 Insert_Component_Invariant_Checks
4691 (N
, Base
, Build_Array_Invariant_Proc
(Base
, N
));
4694 Ghost_Mode
:= Save_Ghost_Mode
;
4695 end Expand_Freeze_Array_Type
;
4697 -----------------------------------
4698 -- Expand_Freeze_Class_Wide_Type --
4699 -----------------------------------
4701 procedure Expand_Freeze_Class_Wide_Type
(N
: Node_Id
) is
4702 function Is_C_Derivation
(Typ
: Entity_Id
) return Boolean;
4703 -- Given a type, determine whether it is derived from a C or C++ root
4705 ---------------------
4706 -- Is_C_Derivation --
4707 ---------------------
4709 function Is_C_Derivation
(Typ
: Entity_Id
) return Boolean is
4716 or else Convention
(T
) = Convention_C
4717 or else Convention
(T
) = Convention_CPP
4722 exit when T
= Etype
(T
);
4728 end Is_C_Derivation
;
4732 Typ
: constant Entity_Id
:= Entity
(N
);
4733 Root
: constant Entity_Id
:= Root_Type
(Typ
);
4735 Save_Ghost_Mode
: constant Ghost_Mode_Type
:= Ghost_Mode
;
4737 -- Start of processing for Expand_Freeze_Class_Wide_Type
4740 -- Certain run-time configurations and targets do not provide support
4741 -- for controlled types.
4743 if Restriction_Active
(No_Finalization
) then
4746 -- Do not create TSS routine Finalize_Address when dispatching calls are
4747 -- disabled since the core of the routine is a dispatching call.
4749 elsif Restriction_Active
(No_Dispatching_Calls
) then
4752 -- Do not create TSS routine Finalize_Address for concurrent class-wide
4753 -- types. Ignore C, C++, CIL and Java types since it is assumed that the
4754 -- non-Ada side will handle their destruction.
4756 elsif Is_Concurrent_Type
(Root
)
4757 or else Is_C_Derivation
(Root
)
4758 or else Convention
(Typ
) = Convention_CPP
4762 -- Do not create TSS routine Finalize_Address when compiling in CodePeer
4763 -- mode since the routine contains an Unchecked_Conversion.
4765 elsif CodePeer_Mode
then
4769 -- Ensure that all freezing activities are properly flagged as Ghost
4771 Set_Ghost_Mode_From_Entity
(Typ
);
4773 -- Create the body of TSS primitive Finalize_Address. This automatically
4774 -- sets the TSS entry for the class-wide type.
4776 Make_Finalize_Address_Body
(Typ
);
4777 Ghost_Mode
:= Save_Ghost_Mode
;
4778 end Expand_Freeze_Class_Wide_Type
;
4780 ------------------------------------
4781 -- Expand_Freeze_Enumeration_Type --
4782 ------------------------------------
4784 procedure Expand_Freeze_Enumeration_Type
(N
: Node_Id
) is
4785 Typ
: constant Entity_Id
:= Entity
(N
);
4786 Loc
: constant Source_Ptr
:= Sloc
(Typ
);
4788 Save_Ghost_Mode
: constant Ghost_Mode_Type
:= Ghost_Mode
;
4793 Is_Contiguous
: Boolean;
4801 pragma Warnings
(Off
, Func
);
4804 -- Ensure that all freezing activities are properly flagged as Ghost
4806 Set_Ghost_Mode_From_Entity
(Typ
);
4808 -- Various optimizations possible if given representation is contiguous
4810 Is_Contiguous
:= True;
4812 Ent
:= First_Literal
(Typ
);
4813 Last_Repval
:= Enumeration_Rep
(Ent
);
4816 while Present
(Ent
) loop
4817 if Enumeration_Rep
(Ent
) - Last_Repval
/= 1 then
4818 Is_Contiguous
:= False;
4821 Last_Repval
:= Enumeration_Rep
(Ent
);
4827 if Is_Contiguous
then
4828 Set_Has_Contiguous_Rep
(Typ
);
4829 Ent
:= First_Literal
(Typ
);
4831 Lst
:= New_List
(New_Occurrence_Of
(Ent
, Sloc
(Ent
)));
4834 -- Build list of literal references
4839 Ent
:= First_Literal
(Typ
);
4840 while Present
(Ent
) loop
4841 Append_To
(Lst
, New_Occurrence_Of
(Ent
, Sloc
(Ent
)));
4847 -- Now build an array declaration
4849 -- typA : array (Natural range 0 .. num - 1) of ctype :=
4850 -- (v, v, v, v, v, ....)
4852 -- where ctype is the corresponding integer type. If the representation
4853 -- is contiguous, we only keep the first literal, which provides the
4854 -- offset for Pos_To_Rep computations.
4857 Make_Defining_Identifier
(Loc
,
4858 Chars
=> New_External_Name
(Chars
(Typ
), 'A'));
4860 Append_Freeze_Action
(Typ
,
4861 Make_Object_Declaration
(Loc
,
4862 Defining_Identifier
=> Arr
,
4863 Constant_Present
=> True,
4865 Object_Definition
=>
4866 Make_Constrained_Array_Definition
(Loc
,
4867 Discrete_Subtype_Definitions
=> New_List
(
4868 Make_Subtype_Indication
(Loc
,
4869 Subtype_Mark
=> New_Occurrence_Of
(Standard_Natural
, Loc
),
4871 Make_Range_Constraint
(Loc
,
4875 Make_Integer_Literal
(Loc
, 0),
4877 Make_Integer_Literal
(Loc
, Num
- 1))))),
4879 Component_Definition
=>
4880 Make_Component_Definition
(Loc
,
4881 Aliased_Present
=> False,
4882 Subtype_Indication
=> New_Occurrence_Of
(Typ
, Loc
))),
4885 Make_Aggregate
(Loc
,
4886 Expressions
=> Lst
)));
4888 Set_Enum_Pos_To_Rep
(Typ
, Arr
);
4890 -- Now we build the function that converts representation values to
4891 -- position values. This function has the form:
4893 -- function _Rep_To_Pos (A : etype; F : Boolean) return Integer is
4896 -- when enum-lit'Enum_Rep => return posval;
4897 -- when enum-lit'Enum_Rep => return posval;
4900 -- [raise Constraint_Error when F "invalid data"]
4905 -- Note: the F parameter determines whether the others case (no valid
4906 -- representation) raises Constraint_Error or returns a unique value
4907 -- of minus one. The latter case is used, e.g. in 'Valid code.
4909 -- Note: the reason we use Enum_Rep values in the case here is to avoid
4910 -- the code generator making inappropriate assumptions about the range
4911 -- of the values in the case where the value is invalid. ityp is a
4912 -- signed or unsigned integer type of appropriate width.
4914 -- Note: if exceptions are not supported, then we suppress the raise
4915 -- and return -1 unconditionally (this is an erroneous program in any
4916 -- case and there is no obligation to raise Constraint_Error here). We
4917 -- also do this if pragma Restrictions (No_Exceptions) is active.
4919 -- Is this right??? What about No_Exception_Propagation???
4921 -- Representations are signed
4923 if Enumeration_Rep
(First_Literal
(Typ
)) < 0 then
4925 -- The underlying type is signed. Reset the Is_Unsigned_Type
4926 -- explicitly, because it might have been inherited from
4929 Set_Is_Unsigned_Type
(Typ
, False);
4931 if Esize
(Typ
) <= Standard_Integer_Size
then
4932 Ityp
:= Standard_Integer
;
4934 Ityp
:= Universal_Integer
;
4937 -- Representations are unsigned
4940 if Esize
(Typ
) <= Standard_Integer_Size
then
4941 Ityp
:= RTE
(RE_Unsigned
);
4943 Ityp
:= RTE
(RE_Long_Long_Unsigned
);
4947 -- The body of the function is a case statement. First collect case
4948 -- alternatives, or optimize the contiguous case.
4952 -- If representation is contiguous, Pos is computed by subtracting
4953 -- the representation of the first literal.
4955 if Is_Contiguous
then
4956 Ent
:= First_Literal
(Typ
);
4958 if Enumeration_Rep
(Ent
) = Last_Repval
then
4960 -- Another special case: for a single literal, Pos is zero
4962 Pos_Expr
:= Make_Integer_Literal
(Loc
, Uint_0
);
4966 Convert_To
(Standard_Integer
,
4967 Make_Op_Subtract
(Loc
,
4969 Unchecked_Convert_To
4970 (Ityp
, Make_Identifier
(Loc
, Name_uA
)),
4972 Make_Integer_Literal
(Loc
,
4973 Intval
=> Enumeration_Rep
(First_Literal
(Typ
)))));
4977 Make_Case_Statement_Alternative
(Loc
,
4978 Discrete_Choices
=> New_List
(
4979 Make_Range
(Sloc
(Enumeration_Rep_Expr
(Ent
)),
4981 Make_Integer_Literal
(Loc
,
4982 Intval
=> Enumeration_Rep
(Ent
)),
4984 Make_Integer_Literal
(Loc
, Intval
=> Last_Repval
))),
4986 Statements
=> New_List
(
4987 Make_Simple_Return_Statement
(Loc
,
4988 Expression
=> Pos_Expr
))));
4991 Ent
:= First_Literal
(Typ
);
4992 while Present
(Ent
) loop
4994 Make_Case_Statement_Alternative
(Loc
,
4995 Discrete_Choices
=> New_List
(
4996 Make_Integer_Literal
(Sloc
(Enumeration_Rep_Expr
(Ent
)),
4997 Intval
=> Enumeration_Rep
(Ent
))),
4999 Statements
=> New_List
(
5000 Make_Simple_Return_Statement
(Loc
,
5002 Make_Integer_Literal
(Loc
,
5003 Intval
=> Enumeration_Pos
(Ent
))))));
5009 -- In normal mode, add the others clause with the test.
5010 -- If Predicates_Ignored is True, validity checks do not apply to
5013 if not No_Exception_Handlers_Set
5014 and then not Predicates_Ignored
(Typ
)
5017 Make_Case_Statement_Alternative
(Loc
,
5018 Discrete_Choices
=> New_List
(Make_Others_Choice
(Loc
)),
5019 Statements
=> New_List
(
5020 Make_Raise_Constraint_Error
(Loc
,
5021 Condition
=> Make_Identifier
(Loc
, Name_uF
),
5022 Reason
=> CE_Invalid_Data
),
5023 Make_Simple_Return_Statement
(Loc
,
5024 Expression
=> Make_Integer_Literal
(Loc
, -1)))));
5026 -- If either of the restrictions No_Exceptions_Handlers/Propagation is
5027 -- active then return -1 (we cannot usefully raise Constraint_Error in
5028 -- this case). See description above for further details.
5032 Make_Case_Statement_Alternative
(Loc
,
5033 Discrete_Choices
=> New_List
(Make_Others_Choice
(Loc
)),
5034 Statements
=> New_List
(
5035 Make_Simple_Return_Statement
(Loc
,
5036 Expression
=> Make_Integer_Literal
(Loc
, -1)))));
5039 -- Now we can build the function body
5042 Make_Defining_Identifier
(Loc
, Make_TSS_Name
(Typ
, TSS_Rep_To_Pos
));
5045 Make_Subprogram_Body
(Loc
,
5047 Make_Function_Specification
(Loc
,
5048 Defining_Unit_Name
=> Fent
,
5049 Parameter_Specifications
=> New_List
(
5050 Make_Parameter_Specification
(Loc
,
5051 Defining_Identifier
=>
5052 Make_Defining_Identifier
(Loc
, Name_uA
),
5053 Parameter_Type
=> New_Occurrence_Of
(Typ
, Loc
)),
5054 Make_Parameter_Specification
(Loc
,
5055 Defining_Identifier
=>
5056 Make_Defining_Identifier
(Loc
, Name_uF
),
5058 New_Occurrence_Of
(Standard_Boolean
, Loc
))),
5060 Result_Definition
=> New_Occurrence_Of
(Standard_Integer
, Loc
)),
5062 Declarations
=> Empty_List
,
5064 Handled_Statement_Sequence
=>
5065 Make_Handled_Sequence_Of_Statements
(Loc
,
5066 Statements
=> New_List
(
5067 Make_Case_Statement
(Loc
,
5069 Unchecked_Convert_To
5070 (Ityp
, Make_Identifier
(Loc
, Name_uA
)),
5071 Alternatives
=> Lst
))));
5073 Set_TSS
(Typ
, Fent
);
5075 -- Set Pure flag (it will be reset if the current context is not Pure).
5076 -- We also pretend there was a pragma Pure_Function so that for purposes
5077 -- of optimization and constant-folding, we will consider the function
5078 -- Pure even if we are not in a Pure context).
5081 Set_Has_Pragma_Pure_Function
(Fent
);
5083 -- Unless we are in -gnatD mode, where we are debugging generated code,
5084 -- this is an internal entity for which we don't need debug info.
5086 if not Debug_Generated_Code
then
5087 Set_Debug_Info_Off
(Fent
);
5090 Ghost_Mode
:= Save_Ghost_Mode
;
5093 when RE_Not_Available
=>
5094 Ghost_Mode
:= Save_Ghost_Mode
;
5096 end Expand_Freeze_Enumeration_Type
;
5098 -------------------------------
5099 -- Expand_Freeze_Record_Type --
5100 -------------------------------
5102 procedure Expand_Freeze_Record_Type
(N
: Node_Id
) is
5103 Typ
: constant Node_Id
:= Entity
(N
);
5104 Typ_Decl
: constant Node_Id
:= Parent
(Typ
);
5106 Save_Ghost_Mode
: constant Ghost_Mode_Type
:= Ghost_Mode
;
5109 Comp_Typ
: Entity_Id
;
5110 Predef_List
: List_Id
;
5112 Wrapper_Decl_List
: List_Id
:= No_List
;
5113 Wrapper_Body_List
: List_Id
:= No_List
;
5115 Renamed_Eq
: Node_Id
:= Empty
;
5116 -- Defining unit name for the predefined equality function in the case
5117 -- where the type has a primitive operation that is a renaming of
5118 -- predefined equality (but only if there is also an overriding
5119 -- user-defined equality function). Used to pass this entity from
5120 -- Make_Predefined_Primitive_Specs to Predefined_Primitive_Bodies.
5122 -- Start of processing for Expand_Freeze_Record_Type
5125 -- Ensure that all freezing activities are properly flagged as Ghost
5127 Set_Ghost_Mode_From_Entity
(Typ
);
5129 -- Build discriminant checking functions if not a derived type (for
5130 -- derived types that are not tagged types, always use the discriminant
5131 -- checking functions of the parent type). However, for untagged types
5132 -- the derivation may have taken place before the parent was frozen, so
5133 -- we copy explicitly the discriminant checking functions from the
5134 -- parent into the components of the derived type.
5136 if not Is_Derived_Type
(Typ
)
5137 or else Has_New_Non_Standard_Rep
(Typ
)
5138 or else Is_Tagged_Type
(Typ
)
5140 Build_Discr_Checking_Funcs
(Typ_Decl
);
5142 elsif Is_Derived_Type
(Typ
)
5143 and then not Is_Tagged_Type
(Typ
)
5145 -- If we have a derived Unchecked_Union, we do not inherit the
5146 -- discriminant checking functions from the parent type since the
5147 -- discriminants are non existent.
5149 and then not Is_Unchecked_Union
(Typ
)
5150 and then Has_Discriminants
(Typ
)
5153 Old_Comp
: Entity_Id
;
5157 First_Component
(Base_Type
(Underlying_Type
(Etype
(Typ
))));
5158 Comp
:= First_Component
(Typ
);
5159 while Present
(Comp
) loop
5160 if Ekind
(Comp
) = E_Component
5161 and then Chars
(Comp
) = Chars
(Old_Comp
)
5163 Set_Discriminant_Checking_Func
5164 (Comp
, Discriminant_Checking_Func
(Old_Comp
));
5167 Next_Component
(Old_Comp
);
5168 Next_Component
(Comp
);
5173 if Is_Derived_Type
(Typ
)
5174 and then Is_Limited_Type
(Typ
)
5175 and then Is_Tagged_Type
(Typ
)
5177 Check_Stream_Attributes
(Typ
);
5180 -- Update task, protected, and controlled component flags, because some
5181 -- of the component types may have been private at the point of the
5182 -- record declaration. Detect anonymous access-to-controlled components.
5184 Comp
:= First_Component
(Typ
);
5185 while Present
(Comp
) loop
5186 Comp_Typ
:= Etype
(Comp
);
5188 if Has_Task
(Comp_Typ
) then
5192 if Has_Protected
(Comp_Typ
) then
5193 Set_Has_Protected
(Typ
);
5196 -- Do not set Has_Controlled_Component on a class-wide equivalent
5197 -- type. See Make_CW_Equivalent_Type.
5199 if not Is_Class_Wide_Equivalent_Type
(Typ
)
5201 (Has_Controlled_Component
(Comp_Typ
)
5202 or else (Chars
(Comp
) /= Name_uParent
5203 and then (Is_Controlled_Active
(Comp_Typ
))))
5205 Set_Has_Controlled_Component
(Typ
);
5208 Next_Component
(Comp
);
5211 -- Handle constructors of untagged CPP_Class types
5213 if not Is_Tagged_Type
(Typ
) and then Is_CPP_Class
(Typ
) then
5214 Set_CPP_Constructors
(Typ
);
5217 -- Creation of the Dispatch Table. Note that a Dispatch Table is built
5218 -- for regular tagged types as well as for Ada types deriving from a C++
5219 -- Class, but not for tagged types directly corresponding to C++ classes
5220 -- In the later case we assume that it is created in the C++ side and we
5223 if Is_Tagged_Type
(Typ
) then
5225 -- Add the _Tag component
5227 if Underlying_Type
(Etype
(Typ
)) = Typ
then
5228 Expand_Tagged_Root
(Typ
);
5231 if Is_CPP_Class
(Typ
) then
5232 Set_All_DT_Position
(Typ
);
5234 -- Create the tag entities with a minimum decoration
5236 if Tagged_Type_Expansion
then
5237 Append_Freeze_Actions
(Typ
, Make_Tags
(Typ
));
5240 Set_CPP_Constructors
(Typ
);
5243 if not Building_Static_DT
(Typ
) then
5245 -- Usually inherited primitives are not delayed but the first
5246 -- Ada extension of a CPP_Class is an exception since the
5247 -- address of the inherited subprogram has to be inserted in
5248 -- the new Ada Dispatch Table and this is a freezing action.
5250 -- Similarly, if this is an inherited operation whose parent is
5251 -- not frozen yet, it is not in the DT of the parent, and we
5252 -- generate an explicit freeze node for the inherited operation
5253 -- so it is properly inserted in the DT of the current type.
5260 Elmt
:= First_Elmt
(Primitive_Operations
(Typ
));
5261 while Present
(Elmt
) loop
5262 Subp
:= Node
(Elmt
);
5264 if Present
(Alias
(Subp
)) then
5265 if Is_CPP_Class
(Etype
(Typ
)) then
5266 Set_Has_Delayed_Freeze
(Subp
);
5268 elsif Has_Delayed_Freeze
(Alias
(Subp
))
5269 and then not Is_Frozen
(Alias
(Subp
))
5271 Set_Is_Frozen
(Subp
, False);
5272 Set_Has_Delayed_Freeze
(Subp
);
5281 -- Unfreeze momentarily the type to add the predefined primitives
5282 -- operations. The reason we unfreeze is so that these predefined
5283 -- operations will indeed end up as primitive operations (which
5284 -- must be before the freeze point).
5286 Set_Is_Frozen
(Typ
, False);
5288 -- Do not add the spec of predefined primitives in case of
5289 -- CPP tagged type derivations that have convention CPP.
5291 if Is_CPP_Class
(Root_Type
(Typ
))
5292 and then Convention
(Typ
) = Convention_CPP
5296 -- Do not add the spec of the predefined primitives if we are
5297 -- compiling under restriction No_Dispatching_Calls.
5299 elsif not Restriction_Active
(No_Dispatching_Calls
) then
5300 Make_Predefined_Primitive_Specs
(Typ
, Predef_List
, Renamed_Eq
);
5301 Insert_List_Before_And_Analyze
(N
, Predef_List
);
5304 -- Ada 2005 (AI-391): For a nonabstract null extension, create
5305 -- wrapper functions for each nonoverridden inherited function
5306 -- with a controlling result of the type. The wrapper for such
5307 -- a function returns an extension aggregate that invokes the
5310 if Ada_Version
>= Ada_2005
5311 and then not Is_Abstract_Type
(Typ
)
5312 and then Is_Null_Extension
(Typ
)
5314 Make_Controlling_Function_Wrappers
5315 (Typ
, Wrapper_Decl_List
, Wrapper_Body_List
);
5316 Insert_List_Before_And_Analyze
(N
, Wrapper_Decl_List
);
5319 -- Ada 2005 (AI-251): For a nonabstract type extension, build
5320 -- null procedure declarations for each set of homographic null
5321 -- procedures that are inherited from interface types but not
5322 -- overridden. This is done to ensure that the dispatch table
5323 -- entry associated with such null primitives are properly filled.
5325 if Ada_Version
>= Ada_2005
5326 and then Etype
(Typ
) /= Typ
5327 and then not Is_Abstract_Type
(Typ
)
5328 and then Has_Interfaces
(Typ
)
5330 Insert_Actions
(N
, Make_Null_Procedure_Specs
(Typ
));
5333 Set_Is_Frozen
(Typ
);
5335 if not Is_Derived_Type
(Typ
)
5336 or else Is_Tagged_Type
(Etype
(Typ
))
5338 Set_All_DT_Position
(Typ
);
5340 -- If this is a type derived from an untagged private type whose
5341 -- full view is tagged, the type is marked tagged for layout
5342 -- reasons, but it has no dispatch table.
5344 elsif Is_Derived_Type
(Typ
)
5345 and then Is_Private_Type
(Etype
(Typ
))
5346 and then not Is_Tagged_Type
(Etype
(Typ
))
5351 -- Create and decorate the tags. Suppress their creation when
5352 -- not Tagged_Type_Expansion because the dispatching mechanism is
5353 -- handled internally by the virtual target.
5355 if Tagged_Type_Expansion
then
5356 Append_Freeze_Actions
(Typ
, Make_Tags
(Typ
));
5358 -- Generate dispatch table of locally defined tagged type.
5359 -- Dispatch tables of library level tagged types are built
5360 -- later (see Analyze_Declarations).
5362 if not Building_Static_DT
(Typ
) then
5363 Append_Freeze_Actions
(Typ
, Make_DT
(Typ
));
5367 -- If the type has unknown discriminants, propagate dispatching
5368 -- information to its underlying record view, which does not get
5369 -- its own dispatch table.
5371 if Is_Derived_Type
(Typ
)
5372 and then Has_Unknown_Discriminants
(Typ
)
5373 and then Present
(Underlying_Record_View
(Typ
))
5376 Rep
: constant Entity_Id
:= Underlying_Record_View
(Typ
);
5378 Set_Access_Disp_Table
5379 (Rep
, Access_Disp_Table
(Typ
));
5380 Set_Dispatch_Table_Wrappers
5381 (Rep
, Dispatch_Table_Wrappers
(Typ
));
5382 Set_Direct_Primitive_Operations
5383 (Rep
, Direct_Primitive_Operations
(Typ
));
5387 -- Make sure that the primitives Initialize, Adjust and Finalize
5388 -- are Frozen before other TSS subprograms. We don't want them
5391 if Is_Controlled
(Typ
) then
5392 if not Is_Limited_Type
(Typ
) then
5393 Append_Freeze_Actions
(Typ
,
5394 Freeze_Entity
(Find_Prim_Op
(Typ
, Name_Adjust
), Typ
));
5397 Append_Freeze_Actions
(Typ
,
5398 Freeze_Entity
(Find_Prim_Op
(Typ
, Name_Initialize
), Typ
));
5400 Append_Freeze_Actions
(Typ
,
5401 Freeze_Entity
(Find_Prim_Op
(Typ
, Name_Finalize
), Typ
));
5404 -- Freeze rest of primitive operations. There is no need to handle
5405 -- the predefined primitives if we are compiling under restriction
5406 -- No_Dispatching_Calls.
5408 if not Restriction_Active
(No_Dispatching_Calls
) then
5409 Append_Freeze_Actions
(Typ
, Predefined_Primitive_Freeze
(Typ
));
5413 -- In the untagged case, ever since Ada 83 an equality function must
5414 -- be provided for variant records that are not unchecked unions.
5415 -- In Ada 2012 the equality function composes, and thus must be built
5416 -- explicitly just as for tagged records.
5418 elsif Has_Discriminants
(Typ
)
5419 and then not Is_Limited_Type
(Typ
)
5422 Comps
: constant Node_Id
:=
5423 Component_List
(Type_Definition
(Typ_Decl
));
5426 and then Present
(Variant_Part
(Comps
))
5428 Build_Variant_Record_Equality
(Typ
);
5432 -- Otherwise create primitive equality operation (AI05-0123)
5434 -- This is done unconditionally to ensure that tools can be linked
5435 -- properly with user programs compiled with older language versions.
5436 -- In addition, this is needed because "=" composes for bounded strings
5437 -- in all language versions (see Exp_Ch4.Expand_Composite_Equality).
5439 elsif Comes_From_Source
(Typ
)
5440 and then Convention
(Typ
) = Convention_Ada
5441 and then not Is_Limited_Type
(Typ
)
5443 Build_Untagged_Equality
(Typ
);
5446 -- Before building the record initialization procedure, if we are
5447 -- dealing with a concurrent record value type, then we must go through
5448 -- the discriminants, exchanging discriminals between the concurrent
5449 -- type and the concurrent record value type. See the section "Handling
5450 -- of Discriminants" in the Einfo spec for details.
5452 if Is_Concurrent_Record_Type
(Typ
)
5453 and then Has_Discriminants
(Typ
)
5456 Ctyp
: constant Entity_Id
:=
5457 Corresponding_Concurrent_Type
(Typ
);
5458 Conc_Discr
: Entity_Id
;
5459 Rec_Discr
: Entity_Id
;
5463 Conc_Discr
:= First_Discriminant
(Ctyp
);
5464 Rec_Discr
:= First_Discriminant
(Typ
);
5465 while Present
(Conc_Discr
) loop
5466 Temp
:= Discriminal
(Conc_Discr
);
5467 Set_Discriminal
(Conc_Discr
, Discriminal
(Rec_Discr
));
5468 Set_Discriminal
(Rec_Discr
, Temp
);
5470 Set_Discriminal_Link
(Discriminal
(Conc_Discr
), Conc_Discr
);
5471 Set_Discriminal_Link
(Discriminal
(Rec_Discr
), Rec_Discr
);
5473 Next_Discriminant
(Conc_Discr
);
5474 Next_Discriminant
(Rec_Discr
);
5479 if Has_Controlled_Component
(Typ
) then
5480 Build_Controlling_Procs
(Typ
);
5483 Adjust_Discriminants
(Typ
);
5485 -- Do not need init for interfaces on virtual targets since they're
5488 if Tagged_Type_Expansion
or else not Is_Interface
(Typ
) then
5489 Build_Record_Init_Proc
(Typ_Decl
, Typ
);
5492 -- For tagged type that are not interfaces, build bodies of primitive
5493 -- operations. Note: do this after building the record initialization
5494 -- procedure, since the primitive operations may need the initialization
5495 -- routine. There is no need to add predefined primitives of interfaces
5496 -- because all their predefined primitives are abstract.
5498 if Is_Tagged_Type
(Typ
) and then not Is_Interface
(Typ
) then
5500 -- Do not add the body of predefined primitives in case of CPP tagged
5501 -- type derivations that have convention CPP.
5503 if Is_CPP_Class
(Root_Type
(Typ
))
5504 and then Convention
(Typ
) = Convention_CPP
5508 -- Do not add the body of the predefined primitives if we are
5509 -- compiling under restriction No_Dispatching_Calls or if we are
5510 -- compiling a CPP tagged type.
5512 elsif not Restriction_Active
(No_Dispatching_Calls
) then
5514 -- Create the body of TSS primitive Finalize_Address. This must
5515 -- be done before the bodies of all predefined primitives are
5516 -- created. If Typ is limited, Stream_Input and Stream_Read may
5517 -- produce build-in-place allocations and for those the expander
5518 -- needs Finalize_Address.
5520 Make_Finalize_Address_Body
(Typ
);
5521 Predef_List
:= Predefined_Primitive_Bodies
(Typ
, Renamed_Eq
);
5522 Append_Freeze_Actions
(Typ
, Predef_List
);
5525 -- Ada 2005 (AI-391): If any wrappers were created for nonoverridden
5526 -- inherited functions, then add their bodies to the freeze actions.
5528 if Present
(Wrapper_Body_List
) then
5529 Append_Freeze_Actions
(Typ
, Wrapper_Body_List
);
5532 -- Create extra formals for the primitive operations of the type.
5533 -- This must be done before analyzing the body of the initialization
5534 -- procedure, because a self-referential type might call one of these
5535 -- primitives in the body of the init_proc itself.
5542 Elmt
:= First_Elmt
(Primitive_Operations
(Typ
));
5543 while Present
(Elmt
) loop
5544 Subp
:= Node
(Elmt
);
5545 if not Has_Foreign_Convention
(Subp
)
5546 and then not Is_Predefined_Dispatching_Operation
(Subp
)
5548 Create_Extra_Formals
(Subp
);
5556 -- Check whether individual components have a defined invariant, and add
5557 -- the corresponding component invariant checks.
5559 -- Do not create an invariant procedure for some internally generated
5560 -- subtypes, in particular those created for objects of a class-wide
5561 -- type. Such types may have components to which invariant apply, but
5562 -- the corresponding checks will be applied when an object of the parent
5563 -- type is constructed.
5565 -- Such objects will show up in a class-wide postcondition, and the
5566 -- invariant will be checked, if necessary, upon return from the
5567 -- enclosing subprogram.
5569 if not Is_Class_Wide_Equivalent_Type
(Typ
) then
5570 Insert_Component_Invariant_Checks
5571 (N
, Typ
, Build_Record_Invariant_Proc
(Typ
, N
));
5574 Ghost_Mode
:= Save_Ghost_Mode
;
5575 end Expand_Freeze_Record_Type
;
5577 ------------------------------------
5578 -- Expand_N_Full_Type_Declaration --
5579 ------------------------------------
5581 procedure Expand_N_Full_Type_Declaration
(N
: Node_Id
) is
5582 procedure Build_Master
(Ptr_Typ
: Entity_Id
);
5583 -- Create the master associated with Ptr_Typ
5589 procedure Build_Master
(Ptr_Typ
: Entity_Id
) is
5590 Desig_Typ
: Entity_Id
:= Designated_Type
(Ptr_Typ
);
5593 -- If the designated type is an incomplete view coming from a
5594 -- limited-with'ed package, we need to use the nonlimited view in
5595 -- case it has tasks.
5597 if Ekind
(Desig_Typ
) in Incomplete_Kind
5598 and then Present
(Non_Limited_View
(Desig_Typ
))
5600 Desig_Typ
:= Non_Limited_View
(Desig_Typ
);
5603 -- Anonymous access types are created for the components of the
5604 -- record parameter for an entry declaration. No master is created
5607 if Comes_From_Source
(N
) and then Has_Task
(Desig_Typ
) then
5608 Build_Master_Entity
(Ptr_Typ
);
5609 Build_Master_Renaming
(Ptr_Typ
);
5611 -- Create a class-wide master because a Master_Id must be generated
5612 -- for access-to-limited-class-wide types whose root may be extended
5613 -- with task components.
5615 -- Note: This code covers access-to-limited-interfaces because they
5616 -- can be used to reference tasks implementing them.
5618 elsif Is_Limited_Class_Wide_Type
(Desig_Typ
)
5619 and then Tasking_Allowed
5621 Build_Class_Wide_Master
(Ptr_Typ
);
5625 -- Local declarations
5627 Def_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
5628 B_Id
: constant Entity_Id
:= Base_Type
(Def_Id
);
5632 -- Start of processing for Expand_N_Full_Type_Declaration
5635 if Is_Access_Type
(Def_Id
) then
5636 Build_Master
(Def_Id
);
5638 if Ekind
(Def_Id
) = E_Access_Protected_Subprogram_Type
then
5639 Expand_Access_Protected_Subprogram_Type
(N
);
5642 -- Array of anonymous access-to-task pointers
5644 elsif Ada_Version
>= Ada_2005
5645 and then Is_Array_Type
(Def_Id
)
5646 and then Is_Access_Type
(Component_Type
(Def_Id
))
5647 and then Ekind
(Component_Type
(Def_Id
)) = E_Anonymous_Access_Type
5649 Build_Master
(Component_Type
(Def_Id
));
5651 elsif Has_Task
(Def_Id
) then
5652 Expand_Previous_Access_Type
(Def_Id
);
5654 -- Check the components of a record type or array of records for
5655 -- anonymous access-to-task pointers.
5657 elsif Ada_Version
>= Ada_2005
5658 and then (Is_Record_Type
(Def_Id
)
5660 (Is_Array_Type
(Def_Id
)
5661 and then Is_Record_Type
(Component_Type
(Def_Id
))))
5670 if Is_Array_Type
(Def_Id
) then
5671 Comp
:= First_Entity
(Component_Type
(Def_Id
));
5673 Comp
:= First_Entity
(Def_Id
);
5676 -- Examine all components looking for anonymous access-to-task
5680 while Present
(Comp
) loop
5681 Typ
:= Etype
(Comp
);
5683 if Ekind
(Typ
) = E_Anonymous_Access_Type
5684 and then Has_Task
(Available_View
(Designated_Type
(Typ
)))
5685 and then No
(Master_Id
(Typ
))
5687 -- Ensure that the record or array type have a _master
5690 Build_Master_Entity
(Def_Id
);
5691 Build_Master_Renaming
(Typ
);
5692 M_Id
:= Master_Id
(Typ
);
5696 -- Reuse the same master to service any additional types
5699 Set_Master_Id
(Typ
, M_Id
);
5708 Par_Id
:= Etype
(B_Id
);
5710 -- The parent type is private then we need to inherit any TSS operations
5711 -- from the full view.
5713 if Ekind
(Par_Id
) in Private_Kind
5714 and then Present
(Full_View
(Par_Id
))
5716 Par_Id
:= Base_Type
(Full_View
(Par_Id
));
5719 if Nkind
(Type_Definition
(Original_Node
(N
))) =
5720 N_Derived_Type_Definition
5721 and then not Is_Tagged_Type
(Def_Id
)
5722 and then Present
(Freeze_Node
(Par_Id
))
5723 and then Present
(TSS_Elist
(Freeze_Node
(Par_Id
)))
5725 Ensure_Freeze_Node
(B_Id
);
5726 FN
:= Freeze_Node
(B_Id
);
5728 if No
(TSS_Elist
(FN
)) then
5729 Set_TSS_Elist
(FN
, New_Elmt_List
);
5733 T_E
: constant Elist_Id
:= TSS_Elist
(FN
);
5737 Elmt
:= First_Elmt
(TSS_Elist
(Freeze_Node
(Par_Id
)));
5738 while Present
(Elmt
) loop
5739 if Chars
(Node
(Elmt
)) /= Name_uInit
then
5740 Append_Elmt
(Node
(Elmt
), T_E
);
5746 -- If the derived type itself is private with a full view, then
5747 -- associate the full view with the inherited TSS_Elist as well.
5749 if Ekind
(B_Id
) in Private_Kind
5750 and then Present
(Full_View
(B_Id
))
5752 Ensure_Freeze_Node
(Base_Type
(Full_View
(B_Id
)));
5754 (Freeze_Node
(Base_Type
(Full_View
(B_Id
))), TSS_Elist
(FN
));
5758 end Expand_N_Full_Type_Declaration
;
5760 ---------------------------------
5761 -- Expand_N_Object_Declaration --
5762 ---------------------------------
5764 procedure Expand_N_Object_Declaration
(N
: Node_Id
) is
5765 Loc
: constant Source_Ptr
:= Sloc
(N
);
5766 Def_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
5767 Expr
: constant Node_Id
:= Expression
(N
);
5768 Obj_Def
: constant Node_Id
:= Object_Definition
(N
);
5769 Typ
: constant Entity_Id
:= Etype
(Def_Id
);
5770 Base_Typ
: constant Entity_Id
:= Base_Type
(Typ
);
5773 function Build_Equivalent_Aggregate
return Boolean;
5774 -- If the object has a constrained discriminated type and no initial
5775 -- value, it may be possible to build an equivalent aggregate instead,
5776 -- and prevent an actual call to the initialization procedure.
5778 procedure Default_Initialize_Object
(After
: Node_Id
);
5779 -- Generate all default initialization actions for object Def_Id. Any
5780 -- new code is inserted after node After.
5782 function Rewrite_As_Renaming
return Boolean;
5783 -- Indicate whether to rewrite a declaration with initialization into an
5784 -- object renaming declaration (see below).
5786 --------------------------------
5787 -- Build_Equivalent_Aggregate --
5788 --------------------------------
5790 function Build_Equivalent_Aggregate
return Boolean is
5794 Full_Type
: Entity_Id
;
5799 if Is_Private_Type
(Typ
) and then Present
(Full_View
(Typ
)) then
5800 Full_Type
:= Full_View
(Typ
);
5803 -- Only perform this transformation if Elaboration_Code is forbidden
5804 -- or undesirable, and if this is a global entity of a constrained
5807 -- If Initialize_Scalars might be active this transformation cannot
5808 -- be performed either, because it will lead to different semantics
5809 -- or because elaboration code will in fact be created.
5811 if Ekind
(Full_Type
) /= E_Record_Subtype
5812 or else not Has_Discriminants
(Full_Type
)
5813 or else not Is_Constrained
(Full_Type
)
5814 or else Is_Controlled
(Full_Type
)
5815 or else Is_Limited_Type
(Full_Type
)
5816 or else not Restriction_Active
(No_Initialize_Scalars
)
5821 if Ekind
(Current_Scope
) = E_Package
5823 (Restriction_Active
(No_Elaboration_Code
)
5824 or else Is_Preelaborated
(Current_Scope
))
5826 -- Building a static aggregate is possible if the discriminants
5827 -- have static values and the other components have static
5828 -- defaults or none.
5830 Discr
:= First_Elmt
(Discriminant_Constraint
(Full_Type
));
5831 while Present
(Discr
) loop
5832 if not Is_OK_Static_Expression
(Node
(Discr
)) then
5839 -- Check that initialized components are OK, and that non-
5840 -- initialized components do not require a call to their own
5841 -- initialization procedure.
5843 Comp
:= First_Component
(Full_Type
);
5844 while Present
(Comp
) loop
5845 if Ekind
(Comp
) = E_Component
5846 and then Present
(Expression
(Parent
(Comp
)))
5848 not Is_OK_Static_Expression
(Expression
(Parent
(Comp
)))
5852 elsif Has_Non_Null_Base_Init_Proc
(Etype
(Comp
)) then
5857 Next_Component
(Comp
);
5860 -- Everything is static, assemble the aggregate, discriminant
5864 Make_Aggregate
(Loc
,
5865 Expressions
=> New_List
,
5866 Component_Associations
=> New_List
);
5868 Discr
:= First_Elmt
(Discriminant_Constraint
(Full_Type
));
5869 while Present
(Discr
) loop
5870 Append_To
(Expressions
(Aggr
), New_Copy
(Node
(Discr
)));
5874 -- Now collect values of initialized components
5876 Comp
:= First_Component
(Full_Type
);
5877 while Present
(Comp
) loop
5878 if Ekind
(Comp
) = E_Component
5879 and then Present
(Expression
(Parent
(Comp
)))
5881 Append_To
(Component_Associations
(Aggr
),
5882 Make_Component_Association
(Loc
,
5883 Choices
=> New_List
(New_Occurrence_Of
(Comp
, Loc
)),
5884 Expression
=> New_Copy_Tree
5885 (Expression
(Parent
(Comp
)))));
5888 Next_Component
(Comp
);
5891 -- Finally, box-initialize remaining components
5893 Append_To
(Component_Associations
(Aggr
),
5894 Make_Component_Association
(Loc
,
5895 Choices
=> New_List
(Make_Others_Choice
(Loc
)),
5896 Expression
=> Empty
));
5897 Set_Box_Present
(Last
(Component_Associations
(Aggr
)));
5898 Set_Expression
(N
, Aggr
);
5900 if Typ
/= Full_Type
then
5901 Analyze_And_Resolve
(Aggr
, Full_View
(Base_Type
(Full_Type
)));
5902 Rewrite
(Aggr
, Unchecked_Convert_To
(Typ
, Aggr
));
5903 Analyze_And_Resolve
(Aggr
, Typ
);
5905 Analyze_And_Resolve
(Aggr
, Full_Type
);
5913 end Build_Equivalent_Aggregate
;
5915 -------------------------------
5916 -- Default_Initialize_Object --
5917 -------------------------------
5919 procedure Default_Initialize_Object
(After
: Node_Id
) is
5920 function New_Object_Reference
return Node_Id
;
5921 -- Return a new reference to Def_Id with attributes Assignment_OK and
5922 -- Must_Not_Freeze already set.
5924 --------------------------
5925 -- New_Object_Reference --
5926 --------------------------
5928 function New_Object_Reference
return Node_Id
is
5929 Obj_Ref
: constant Node_Id
:= New_Occurrence_Of
(Def_Id
, Loc
);
5932 -- The call to the type init proc or [Deep_]Finalize must not
5933 -- freeze the related object as the call is internally generated.
5934 -- This way legal rep clauses that apply to the object will not be
5935 -- flagged. Note that the initialization call may be removed if
5936 -- pragma Import is encountered or moved to the freeze actions of
5937 -- the object because of an address clause.
5939 Set_Assignment_OK
(Obj_Ref
);
5940 Set_Must_Not_Freeze
(Obj_Ref
);
5943 end New_Object_Reference
;
5947 Exceptions_OK
: constant Boolean :=
5948 not Restriction_Active
(No_Exception_Propagation
);
5951 Abrt_Blk_Id
: Entity_Id
;
5953 Aggr_Init
: Node_Id
;
5955 Comp_Init
: List_Id
:= No_List
;
5957 Init_Stmts
: List_Id
:= No_List
;
5958 Obj_Init
: Node_Id
:= Empty
;
5961 -- Start of processing for Default_Initialize_Object
5964 -- Default initialization is suppressed for objects that are already
5965 -- known to be imported (i.e. whose declaration specifies the Import
5966 -- aspect). Note that for objects with a pragma Import, we generate
5967 -- initialization here, and then remove it downstream when processing
5968 -- the pragma. It is also suppressed for variables for which a pragma
5969 -- Suppress_Initialization has been explicitly given
5971 if Is_Imported
(Def_Id
) or else Suppress_Initialization
(Def_Id
) then
5975 -- The expansion performed by this routine is as follows:
5979 -- Type_Init_Proc (Obj);
5982 -- [Deep_]Initialize (Obj);
5986 -- [Deep_]Finalize (Obj, Self => False);
5990 -- Abort_Undefer_Direct;
5993 -- Initialize the components of the object
5995 if Has_Non_Null_Base_Init_Proc
(Typ
)
5996 and then not No_Initialization
(N
)
5997 and then not Initialization_Suppressed
(Typ
)
5999 -- Do not initialize the components if No_Default_Initialization
6000 -- applies as the actual restriction check will occur later
6001 -- when the object is frozen as it is not known yet whether the
6002 -- object is imported or not.
6004 if not Restriction_Active
(No_Default_Initialization
) then
6006 -- If the values of the components are compile-time known, use
6007 -- their prebuilt aggregate form directly.
6009 Aggr_Init
:= Static_Initialization
(Base_Init_Proc
(Typ
));
6011 if Present
(Aggr_Init
) then
6013 (N
, New_Copy_Tree
(Aggr_Init
, New_Scope
=> Current_Scope
));
6015 -- If type has discriminants, try to build an equivalent
6016 -- aggregate using discriminant values from the declaration.
6017 -- This is a useful optimization, in particular if restriction
6018 -- No_Elaboration_Code is active.
6020 elsif Build_Equivalent_Aggregate
then
6023 -- Otherwise invoke the type init proc, generate:
6024 -- Type_Init_Proc (Obj);
6027 Obj_Ref
:= New_Object_Reference
;
6029 if Comes_From_Source
(Def_Id
) then
6030 Initialization_Warning
(Obj_Ref
);
6033 Comp_Init
:= Build_Initialization_Call
(Loc
, Obj_Ref
, Typ
);
6037 -- Provide a default value if the object needs simple initialization
6038 -- and does not already have an initial value. A generated temporary
6039 -- does not require initialization because it will be assigned later.
6041 elsif Needs_Simple_Initialization
6042 (Typ
, Initialize_Scalars
6043 and then No
(Following_Address_Clause
(N
)))
6044 and then not Is_Internal
(Def_Id
)
6045 and then not Has_Init_Expression
(N
)
6047 Set_No_Initialization
(N
, False);
6048 Set_Expression
(N
, Get_Simple_Init_Val
(Typ
, N
, Esize
(Def_Id
)));
6049 Analyze_And_Resolve
(Expression
(N
), Typ
);
6052 -- Initialize the object, generate:
6053 -- [Deep_]Initialize (Obj);
6055 if Needs_Finalization
(Typ
) and then not No_Initialization
(N
) then
6058 (Obj_Ref
=> New_Occurrence_Of
(Def_Id
, Loc
),
6062 -- Build a special finalization block when both the object and its
6063 -- controlled components are to be initialized. The block finalizes
6064 -- the components if the object initialization fails. Generate:
6075 if Has_Controlled_Component
(Typ
)
6076 and then Present
(Comp_Init
)
6077 and then Present
(Obj_Init
)
6078 and then Exceptions_OK
6080 Init_Stmts
:= Comp_Init
;
6084 (Obj_Ref
=> New_Object_Reference
,
6088 if Present
(Fin_Call
) then
6090 -- Do not emit warnings related to the elaboration order when a
6091 -- controlled object is declared before the body of Finalize is
6094 Set_No_Elaboration_Check
(Fin_Call
);
6096 Append_To
(Init_Stmts
,
6097 Make_Block_Statement
(Loc
,
6098 Declarations
=> No_List
,
6100 Handled_Statement_Sequence
=>
6101 Make_Handled_Sequence_Of_Statements
(Loc
,
6102 Statements
=> New_List
(Obj_Init
),
6104 Exception_Handlers
=> New_List
(
6105 Make_Exception_Handler
(Loc
,
6106 Exception_Choices
=> New_List
(
6107 Make_Others_Choice
(Loc
)),
6109 Statements
=> New_List
(
6111 Make_Raise_Statement
(Loc
)))))));
6114 -- Otherwise finalization is not required, the initialization calls
6115 -- are passed to the abort block building circuitry, generate:
6117 -- Type_Init_Proc (Obj);
6118 -- [Deep_]Initialize (Obj);
6121 if Present
(Comp_Init
) then
6122 Init_Stmts
:= Comp_Init
;
6125 if Present
(Obj_Init
) then
6126 if No
(Init_Stmts
) then
6127 Init_Stmts
:= New_List
;
6130 Append_To
(Init_Stmts
, Obj_Init
);
6134 -- Build an abort block to protect the initialization calls
6137 and then Present
(Comp_Init
)
6138 and then Present
(Obj_Init
)
6143 Prepend_To
(Init_Stmts
, Build_Runtime_Call
(Loc
, RE_Abort_Defer
));
6145 -- When exceptions are propagated, abort deferral must take place
6146 -- in the presence of initialization or finalization exceptions.
6153 -- Abort_Undefer_Direct;
6156 if Exceptions_OK
then
6157 AUD
:= RTE
(RE_Abort_Undefer_Direct
);
6160 Make_Handled_Sequence_Of_Statements
(Loc
,
6161 Statements
=> Init_Stmts
,
6162 At_End_Proc
=> New_Occurrence_Of
(AUD
, Loc
));
6165 Make_Block_Statement
(Loc
,
6166 Handled_Statement_Sequence
=> Abrt_HSS
);
6168 Add_Block_Identifier
(Abrt_Blk
, Abrt_Blk_Id
);
6169 Expand_At_End_Handler
(Abrt_HSS
, Abrt_Blk_Id
);
6171 -- Present the Abort_Undefer_Direct function to the backend so
6172 -- that it can inline the call to the function.
6174 Add_Inlined_Body
(AUD
, N
);
6176 Init_Stmts
:= New_List
(Abrt_Blk
);
6178 -- Otherwise exceptions are not propagated. Generate:
6185 Append_To
(Init_Stmts
,
6186 Build_Runtime_Call
(Loc
, RE_Abort_Undefer
));
6190 -- Insert the whole initialization sequence into the tree. If the
6191 -- object has a delayed freeze, as will be the case when it has
6192 -- aspect specifications, the initialization sequence is part of
6193 -- the freeze actions.
6195 if Present
(Init_Stmts
) then
6196 if Has_Delayed_Freeze
(Def_Id
) then
6197 Append_Freeze_Actions
(Def_Id
, Init_Stmts
);
6199 Insert_Actions_After
(After
, Init_Stmts
);
6202 end Default_Initialize_Object
;
6204 -------------------------
6205 -- Rewrite_As_Renaming --
6206 -------------------------
6208 function Rewrite_As_Renaming
return Boolean is
6210 -- If the object declaration appears in the form
6212 -- Obj : Ctrl_Typ := Func (...);
6214 -- where Ctrl_Typ is controlled but not immutably limited type, then
6215 -- the expansion of the function call should use a dereference of the
6216 -- result to reference the value on the secondary stack.
6218 -- Obj : Ctrl_Typ renames Func (...).all;
6220 -- As a result, the call avoids an extra copy. This an optimization,
6221 -- but it is required for passing ACATS tests in some cases where it
6222 -- would otherwise make two copies. The RM allows removing redunant
6223 -- Adjust/Finalize calls, but does not allow insertion of extra ones.
6225 -- This part is disabled for now, because it breaks GPS builds
6227 return (False -- ???
6228 and then Nkind
(Expr_Q
) = N_Explicit_Dereference
6229 and then not Comes_From_Source
(Expr_Q
)
6230 and then Nkind
(Original_Node
(Expr_Q
)) = N_Function_Call
6231 and then Nkind
(Object_Definition
(N
)) in N_Has_Entity
6232 and then (Needs_Finalization
(Entity
(Object_Definition
(N
)))))
6234 -- If the initializing expression is for a variable with attribute
6235 -- OK_To_Rename set, then transform:
6237 -- Obj : Typ := Expr;
6241 -- Obj : Typ renames Expr;
6243 -- provided that Obj is not aliased. The aliased case has to be
6244 -- excluded in general because Expr will not be aliased in
6248 (not Aliased_Present
(N
)
6249 and then Is_Entity_Name
(Expr_Q
)
6250 and then Ekind
(Entity
(Expr_Q
)) = E_Variable
6251 and then OK_To_Rename
(Entity
(Expr_Q
))
6252 and then Is_Entity_Name
(Obj_Def
));
6253 end Rewrite_As_Renaming
;
6257 Next_N
: constant Node_Id
:= Next
(N
);
6259 Tag_Assign
: Node_Id
;
6261 Init_After
: Node_Id
:= N
;
6262 -- Node after which the initialization actions are to be inserted. This
6263 -- is normally N, except for the case of a shared passive variable, in
6264 -- which case the init proc call must be inserted only after the bodies
6265 -- of the shared variable procedures have been seen.
6267 -- Start of processing for Expand_N_Object_Declaration
6270 -- Don't do anything for deferred constants. All proper actions will be
6271 -- expanded during the full declaration.
6273 if No
(Expr
) and Constant_Present
(N
) then
6277 -- The type of the object cannot be abstract. This is diagnosed at the
6278 -- point the object is frozen, which happens after the declaration is
6279 -- fully expanded, so simply return now.
6281 if Is_Abstract_Type
(Typ
) then
6285 -- First we do special processing for objects of a tagged type where
6286 -- this is the point at which the type is frozen. The creation of the
6287 -- dispatch table and the initialization procedure have to be deferred
6288 -- to this point, since we reference previously declared primitive
6291 -- Force construction of dispatch tables of library level tagged types
6293 if Tagged_Type_Expansion
6294 and then Static_Dispatch_Tables
6295 and then Is_Library_Level_Entity
(Def_Id
)
6296 and then Is_Library_Level_Tagged_Type
(Base_Typ
)
6297 and then Ekind_In
(Base_Typ
, E_Record_Type
,
6300 and then not Has_Dispatch_Table
(Base_Typ
)
6303 New_Nodes
: List_Id
:= No_List
;
6306 if Is_Concurrent_Type
(Base_Typ
) then
6307 New_Nodes
:= Make_DT
(Corresponding_Record_Type
(Base_Typ
), N
);
6309 New_Nodes
:= Make_DT
(Base_Typ
, N
);
6312 if not Is_Empty_List
(New_Nodes
) then
6313 Insert_List_Before
(N
, New_Nodes
);
6318 -- Make shared memory routines for shared passive variable
6320 if Is_Shared_Passive
(Def_Id
) then
6321 Init_After
:= Make_Shared_Var_Procs
(N
);
6324 -- If tasks being declared, make sure we have an activation chain
6325 -- defined for the tasks (has no effect if we already have one), and
6326 -- also that a Master variable is established and that the appropriate
6327 -- enclosing construct is established as a task master.
6329 if Has_Task
(Typ
) then
6330 Build_Activation_Chain_Entity
(N
);
6331 Build_Master_Entity
(Def_Id
);
6334 -- Default initialization required, and no expression present
6338 -- If we have a type with a variant part, the initialization proc
6339 -- will contain implicit tests of the discriminant values, which
6340 -- counts as a violation of the restriction No_Implicit_Conditionals.
6342 if Has_Variant_Part
(Typ
) then
6347 Check_Restriction
(Msg
, No_Implicit_Conditionals
, Obj_Def
);
6351 ("\initialization of variant record tests discriminants",
6358 -- For the default initialization case, if we have a private type
6359 -- with invariants, and invariant checks are enabled, then insert an
6360 -- invariant check after the object declaration. Note that it is OK
6361 -- to clobber the object with an invalid value since if the exception
6362 -- is raised, then the object will go out of scope. In the case where
6363 -- an array object is initialized with an aggregate, the expression
6364 -- is removed. Check flag Has_Init_Expression to avoid generating a
6365 -- junk invariant check and flag No_Initialization to avoid checking
6366 -- an uninitialized object such as a compiler temporary used for an
6369 if Has_Invariants
(Base_Typ
)
6370 and then Present
(Invariant_Procedure
(Base_Typ
))
6371 and then not Has_Init_Expression
(N
)
6372 and then not No_Initialization
(N
)
6374 -- If entity has an address clause or aspect, make invariant
6375 -- call into a freeze action for the explicit freeze node for
6376 -- object. Otherwise insert invariant check after declaration.
6378 if Present
(Following_Address_Clause
(N
))
6379 or else Has_Aspect
(Def_Id
, Aspect_Address
)
6381 Ensure_Freeze_Node
(Def_Id
);
6382 Set_Has_Delayed_Freeze
(Def_Id
);
6383 Set_Is_Frozen
(Def_Id
, False);
6385 if not Partial_View_Has_Unknown_Discr
(Typ
) then
6386 Append_Freeze_Action
(Def_Id
,
6387 Make_Invariant_Call
(New_Occurrence_Of
(Def_Id
, Loc
)));
6390 elsif not Partial_View_Has_Unknown_Discr
(Typ
) then
6392 Make_Invariant_Call
(New_Occurrence_Of
(Def_Id
, Loc
)));
6396 Default_Initialize_Object
(Init_After
);
6398 -- Generate attribute for Persistent_BSS if needed
6400 if Persistent_BSS_Mode
6401 and then Comes_From_Source
(N
)
6402 and then Is_Potentially_Persistent_Type
(Typ
)
6403 and then not Has_Init_Expression
(N
)
6404 and then Is_Library_Level_Entity
(Def_Id
)
6410 Make_Linker_Section_Pragma
6411 (Def_Id
, Sloc
(N
), ".persistent.bss");
6412 Insert_After
(N
, Prag
);
6417 -- If access type, then we know it is null if not initialized
6419 if Is_Access_Type
(Typ
) then
6420 Set_Is_Known_Null
(Def_Id
);
6423 -- Explicit initialization present
6426 -- Obtain actual expression from qualified expression
6428 if Nkind
(Expr
) = N_Qualified_Expression
then
6429 Expr_Q
:= Expression
(Expr
);
6434 -- When we have the appropriate type of aggregate in the expression
6435 -- (it has been determined during analysis of the aggregate by
6436 -- setting the delay flag), let's perform in place assignment and
6437 -- thus avoid creating a temporary.
6439 if Is_Delayed_Aggregate
(Expr_Q
) then
6440 Convert_Aggr_In_Object_Decl
(N
);
6442 -- Ada 2005 (AI-318-02): If the initialization expression is a call
6443 -- to a build-in-place function, then access to the declared object
6444 -- must be passed to the function. Currently we limit such functions
6445 -- to those with constrained limited result subtypes, but eventually
6446 -- plan to expand the allowed forms of functions that are treated as
6449 elsif Ada_Version
>= Ada_2005
6450 and then Is_Build_In_Place_Function_Call
(Expr_Q
)
6452 Make_Build_In_Place_Call_In_Object_Declaration
(N
, Expr_Q
);
6454 -- The previous call expands the expression initializing the
6455 -- built-in-place object into further code that will be analyzed
6456 -- later. No further expansion needed here.
6460 -- Ada 2005 (AI-251): Rewrite the expression that initializes a
6461 -- class-wide interface object to ensure that we copy the full
6462 -- object, unless we are targetting a VM where interfaces are handled
6463 -- by VM itself. Note that if the root type of Typ is an ancestor of
6464 -- Expr's type, both types share the same dispatch table and there is
6465 -- no need to displace the pointer.
6467 elsif Is_Interface
(Typ
)
6469 -- Avoid never-ending recursion because if Equivalent_Type is set
6470 -- then we've done it already and must not do it again.
6473 (Nkind
(Obj_Def
) = N_Identifier
6474 and then Present
(Equivalent_Type
(Entity
(Obj_Def
))))
6476 pragma Assert
(Is_Class_Wide_Type
(Typ
));
6478 -- If the object is a return object of an inherently limited type,
6479 -- which implies build-in-place treatment, bypass the special
6480 -- treatment of class-wide interface initialization below. In this
6481 -- case, the expansion of the return statement will take care of
6482 -- creating the object (via allocator) and initializing it.
6484 if Is_Return_Object
(Def_Id
) and then Is_Limited_View
(Typ
) then
6487 elsif Tagged_Type_Expansion
then
6489 Iface
: constant Entity_Id
:= Root_Type
(Typ
);
6490 Expr_N
: Node_Id
:= Expr
;
6491 Expr_Typ
: Entity_Id
;
6497 -- If the original node of the expression was a conversion
6498 -- to this specific class-wide interface type then restore
6499 -- the original node because we must copy the object before
6500 -- displacing the pointer to reference the secondary tag
6501 -- component. This code must be kept synchronized with the
6502 -- expansion done by routine Expand_Interface_Conversion
6504 if not Comes_From_Source
(Expr_N
)
6505 and then Nkind
(Expr_N
) = N_Explicit_Dereference
6506 and then Nkind
(Original_Node
(Expr_N
)) = N_Type_Conversion
6507 and then Etype
(Original_Node
(Expr_N
)) = Typ
6509 Rewrite
(Expr_N
, Original_Node
(Expression
(N
)));
6512 -- Avoid expansion of redundant interface conversion
6514 if Is_Interface
(Etype
(Expr_N
))
6515 and then Nkind
(Expr_N
) = N_Type_Conversion
6516 and then Etype
(Expr_N
) = Typ
6518 Expr_N
:= Expression
(Expr_N
);
6519 Set_Expression
(N
, Expr_N
);
6522 Obj_Id
:= Make_Temporary
(Loc
, 'D', Expr_N
);
6523 Expr_Typ
:= Base_Type
(Etype
(Expr_N
));
6525 if Is_Class_Wide_Type
(Expr_Typ
) then
6526 Expr_Typ
:= Root_Type
(Expr_Typ
);
6530 -- CW : I'Class := Obj;
6533 -- type Ityp is not null access I'Class;
6534 -- CW : I'Class renames Ityp (Tmp.I_Tag'Address).all;
6536 if Comes_From_Source
(Expr_N
)
6537 and then Nkind
(Expr_N
) = N_Identifier
6538 and then not Is_Interface
(Expr_Typ
)
6539 and then Interface_Present_In_Ancestor
(Expr_Typ
, Typ
)
6540 and then (Expr_Typ
= Etype
(Expr_Typ
)
6542 Is_Variable_Size_Record
(Etype
(Expr_Typ
)))
6547 Make_Object_Declaration
(Loc
,
6548 Defining_Identifier
=> Obj_Id
,
6549 Object_Definition
=>
6550 New_Occurrence_Of
(Expr_Typ
, Loc
),
6551 Expression
=> Relocate_Node
(Expr_N
)));
6553 -- Statically reference the tag associated with the
6557 Make_Selected_Component
(Loc
,
6558 Prefix
=> New_Occurrence_Of
(Obj_Id
, Loc
),
6561 (Find_Interface_Tag
(Expr_Typ
, Iface
), Loc
));
6564 -- IW : I'Class := Obj;
6566 -- type Equiv_Record is record ... end record;
6567 -- implicit subtype CW is <Class_Wide_Subtype>;
6568 -- Tmp : CW := CW!(Obj);
6569 -- type Ityp is not null access I'Class;
6570 -- IW : I'Class renames
6571 -- Ityp!(Displace (Temp'Address, I'Tag)).all;
6574 -- Generate the equivalent record type and update the
6575 -- subtype indication to reference it.
6577 Expand_Subtype_From_Expr
6580 Subtype_Indic
=> Obj_Def
,
6583 if not Is_Interface
(Etype
(Expr_N
)) then
6584 New_Expr
:= Relocate_Node
(Expr_N
);
6586 -- For interface types we use 'Address which displaces
6587 -- the pointer to the base of the object (if required)
6591 Unchecked_Convert_To
(Etype
(Obj_Def
),
6592 Make_Explicit_Dereference
(Loc
,
6593 Unchecked_Convert_To
(RTE
(RE_Tag_Ptr
),
6594 Make_Attribute_Reference
(Loc
,
6595 Prefix
=> Relocate_Node
(Expr_N
),
6596 Attribute_Name
=> Name_Address
))));
6601 if not Is_Limited_Record
(Expr_Typ
) then
6603 Make_Object_Declaration
(Loc
,
6604 Defining_Identifier
=> Obj_Id
,
6605 Object_Definition
=>
6606 New_Occurrence_Of
(Etype
(Obj_Def
), Loc
),
6607 Expression
=> New_Expr
));
6609 -- Rename limited type object since they cannot be copied
6610 -- This case occurs when the initialization expression
6611 -- has been previously expanded into a temporary object.
6613 else pragma Assert
(not Comes_From_Source
(Expr_Q
));
6615 Make_Object_Renaming_Declaration
(Loc
,
6616 Defining_Identifier
=> Obj_Id
,
6618 New_Occurrence_Of
(Etype
(Obj_Def
), Loc
),
6620 Unchecked_Convert_To
6621 (Etype
(Obj_Def
), New_Expr
)));
6624 -- Dynamically reference the tag associated with the
6628 Make_Function_Call
(Loc
,
6629 Name
=> New_Occurrence_Of
(RTE
(RE_Displace
), Loc
),
6630 Parameter_Associations
=> New_List
(
6631 Make_Attribute_Reference
(Loc
,
6632 Prefix
=> New_Occurrence_Of
(Obj_Id
, Loc
),
6633 Attribute_Name
=> Name_Address
),
6635 (Node
(First_Elmt
(Access_Disp_Table
(Iface
))),
6640 Make_Object_Renaming_Declaration
(Loc
,
6641 Defining_Identifier
=> Make_Temporary
(Loc
, 'D'),
6642 Subtype_Mark
=> New_Occurrence_Of
(Typ
, Loc
),
6644 Convert_Tag_To_Interface
(Typ
, Tag_Comp
)));
6646 -- If the original entity comes from source, then mark the
6647 -- new entity as needing debug information, even though it's
6648 -- defined by a generated renaming that does not come from
6649 -- source, so that Materialize_Entity will be set on the
6650 -- entity when Debug_Renaming_Declaration is called during
6653 if Comes_From_Source
(Def_Id
) then
6654 Set_Debug_Info_Needed
(Defining_Identifier
(N
));
6657 Analyze
(N
, Suppress
=> All_Checks
);
6659 -- Replace internal identifier of rewritten node by the
6660 -- identifier found in the sources. We also have to exchange
6661 -- entities containing their defining identifiers to ensure
6662 -- the correct replacement of the object declaration by this
6663 -- object renaming declaration because these identifiers
6664 -- were previously added by Enter_Name to the current scope.
6665 -- We must preserve the homonym chain of the source entity
6666 -- as well. We must also preserve the kind of the entity,
6667 -- which may be a constant. Preserve entity chain because
6668 -- itypes may have been generated already, and the full
6669 -- chain must be preserved for final freezing. Finally,
6670 -- preserve Comes_From_Source setting, so that debugging
6671 -- and cross-referencing information is properly kept, and
6672 -- preserve source location, to prevent spurious errors when
6673 -- entities are declared (they must have their own Sloc).
6676 New_Id
: constant Entity_Id
:= Defining_Identifier
(N
);
6677 Next_Temp
: constant Entity_Id
:= Next_Entity
(New_Id
);
6678 S_Flag
: constant Boolean :=
6679 Comes_From_Source
(Def_Id
);
6682 Set_Next_Entity
(New_Id
, Next_Entity
(Def_Id
));
6683 Set_Next_Entity
(Def_Id
, Next_Temp
);
6685 Set_Chars
(Defining_Identifier
(N
), Chars
(Def_Id
));
6686 Set_Homonym
(Defining_Identifier
(N
), Homonym
(Def_Id
));
6687 Set_Ekind
(Defining_Identifier
(N
), Ekind
(Def_Id
));
6688 Set_Sloc
(Defining_Identifier
(N
), Sloc
(Def_Id
));
6690 Set_Comes_From_Source
(Def_Id
, False);
6691 Exchange_Entities
(Defining_Identifier
(N
), Def_Id
);
6692 Set_Comes_From_Source
(Def_Id
, S_Flag
);
6699 -- Common case of explicit object initialization
6702 -- In most cases, we must check that the initial value meets any
6703 -- constraint imposed by the declared type. However, there is one
6704 -- very important exception to this rule. If the entity has an
6705 -- unconstrained nominal subtype, then it acquired its constraints
6706 -- from the expression in the first place, and not only does this
6707 -- mean that the constraint check is not needed, but an attempt to
6708 -- perform the constraint check can cause order of elaboration
6711 if not Is_Constr_Subt_For_U_Nominal
(Typ
) then
6713 -- If this is an allocator for an aggregate that has been
6714 -- allocated in place, delay checks until assignments are
6715 -- made, because the discriminants are not initialized.
6717 if Nkind
(Expr
) = N_Allocator
and then No_Initialization
(Expr
)
6721 -- Otherwise apply a constraint check now if no prev error
6723 elsif Nkind
(Expr
) /= N_Error
then
6724 Apply_Constraint_Check
(Expr
, Typ
);
6726 -- Deal with possible range check
6728 if Do_Range_Check
(Expr
) then
6730 -- If assignment checks are suppressed, turn off flag
6732 if Suppress_Assignment_Checks
(N
) then
6733 Set_Do_Range_Check
(Expr
, False);
6735 -- Otherwise generate the range check
6738 Generate_Range_Check
6739 (Expr
, Typ
, CE_Range_Check_Failed
);
6745 -- If the type is controlled and not inherently limited, then
6746 -- the target is adjusted after the copy and attached to the
6747 -- finalization list. However, no adjustment is done in the case
6748 -- where the object was initialized by a call to a function whose
6749 -- result is built in place, since no copy occurred. (Eventually
6750 -- we plan to support in-place function results for some cases
6751 -- of nonlimited types. ???) Similarly, no adjustment is required
6752 -- if we are going to rewrite the object declaration into a
6753 -- renaming declaration.
6755 if Needs_Finalization
(Typ
)
6756 and then not Is_Limited_View
(Typ
)
6757 and then not Rewrite_As_Renaming
6759 Insert_Action_After
(Init_After
,
6761 Obj_Ref
=> New_Occurrence_Of
(Def_Id
, Loc
),
6765 -- For tagged types, when an init value is given, the tag has to
6766 -- be re-initialized separately in order to avoid the propagation
6767 -- of a wrong tag coming from a view conversion unless the type
6768 -- is class wide (in this case the tag comes from the init value).
6769 -- Suppress the tag assignment when not Tagged_Type_Expansion
6770 -- because tags are represented implicitly in objects. Ditto for
6771 -- types that are CPP_CLASS, and for initializations that are
6772 -- aggregates, because they have to have the right tag.
6774 -- The re-assignment of the tag has to be done even if the object
6775 -- is a constant. The assignment must be analyzed after the
6776 -- declaration. If an address clause follows, this is handled as
6777 -- part of the freeze actions for the object, otherwise insert
6778 -- tag assignment here.
6780 Tag_Assign
:= Make_Tag_Assignment
(N
);
6782 if Present
(Tag_Assign
) then
6783 if Present
(Following_Address_Clause
(N
)) then
6784 Ensure_Freeze_Node
(Def_Id
);
6787 Insert_Action_After
(Init_After
, Tag_Assign
);
6790 -- Handle C++ constructor calls. Note that we do not check that
6791 -- Typ is a tagged type since the equivalent Ada type of a C++
6792 -- class that has no virtual methods is an untagged limited
6795 elsif Is_CPP_Constructor_Call
(Expr
) then
6797 -- The call to the initialization procedure does NOT freeze the
6798 -- object being initialized.
6800 Id_Ref
:= New_Occurrence_Of
(Def_Id
, Loc
);
6801 Set_Must_Not_Freeze
(Id_Ref
);
6802 Set_Assignment_OK
(Id_Ref
);
6804 Insert_Actions_After
(Init_After
,
6805 Build_Initialization_Call
(Loc
, Id_Ref
, Typ
,
6806 Constructor_Ref
=> Expr
));
6808 -- We remove here the original call to the constructor
6809 -- to avoid its management in the backend
6811 Set_Expression
(N
, Empty
);
6814 -- Handle initialization of limited tagged types
6816 elsif Is_Tagged_Type
(Typ
)
6817 and then Is_Class_Wide_Type
(Typ
)
6818 and then Is_Limited_Record
(Typ
)
6819 and then not Is_Limited_Interface
(Typ
)
6821 -- Given that the type is limited we cannot perform a copy. If
6822 -- Expr_Q is the reference to a variable we mark the variable
6823 -- as OK_To_Rename to expand this declaration into a renaming
6824 -- declaration (see bellow).
6826 if Is_Entity_Name
(Expr_Q
) then
6827 Set_OK_To_Rename
(Entity
(Expr_Q
));
6829 -- If we cannot convert the expression into a renaming we must
6830 -- consider it an internal error because the backend does not
6831 -- have support to handle it.
6834 pragma Assert
(False);
6835 raise Program_Error
;
6838 -- For discrete types, set the Is_Known_Valid flag if the
6839 -- initializing value is known to be valid. Only do this for
6840 -- source assignments, since otherwise we can end up turning
6841 -- on the known valid flag prematurely from inserted code.
6843 elsif Comes_From_Source
(N
)
6844 and then Is_Discrete_Type
(Typ
)
6845 and then Expr_Known_Valid
(Expr
)
6847 Set_Is_Known_Valid
(Def_Id
);
6849 elsif Is_Access_Type
(Typ
) then
6851 -- For access types set the Is_Known_Non_Null flag if the
6852 -- initializing value is known to be non-null. We can also set
6853 -- Can_Never_Be_Null if this is a constant.
6855 if Known_Non_Null
(Expr
) then
6856 Set_Is_Known_Non_Null
(Def_Id
, True);
6858 if Constant_Present
(N
) then
6859 Set_Can_Never_Be_Null
(Def_Id
);
6864 -- If validity checking on copies, validate initial expression.
6865 -- But skip this if declaration is for a generic type, since it
6866 -- makes no sense to validate generic types. Not clear if this
6867 -- can happen for legal programs, but it definitely can arise
6868 -- from previous instantiation errors.
6870 if Validity_Checks_On
6871 and then Validity_Check_Copies
6872 and then not Is_Generic_Type
(Etype
(Def_Id
))
6874 Ensure_Valid
(Expr
);
6875 Set_Is_Known_Valid
(Def_Id
);
6879 -- Cases where the back end cannot handle the initialization directly
6880 -- In such cases, we expand an assignment that will be appropriately
6881 -- handled by Expand_N_Assignment_Statement.
6883 -- The exclusion of the unconstrained case is wrong, but for now it
6884 -- is too much trouble ???
6886 if (Is_Possibly_Unaligned_Slice
(Expr
)
6887 or else (Is_Possibly_Unaligned_Object
(Expr
)
6888 and then not Represented_As_Scalar
(Etype
(Expr
))))
6889 and then not (Is_Array_Type
(Etype
(Expr
))
6890 and then not Is_Constrained
(Etype
(Expr
)))
6893 Stat
: constant Node_Id
:=
6894 Make_Assignment_Statement
(Loc
,
6895 Name
=> New_Occurrence_Of
(Def_Id
, Loc
),
6896 Expression
=> Relocate_Node
(Expr
));
6898 Set_Expression
(N
, Empty
);
6899 Set_No_Initialization
(N
);
6900 Set_Assignment_OK
(Name
(Stat
));
6901 Set_No_Ctrl_Actions
(Stat
);
6902 Insert_After_And_Analyze
(Init_After
, Stat
);
6907 if Nkind
(Obj_Def
) = N_Access_Definition
6908 and then not Is_Local_Anonymous_Access
(Etype
(Def_Id
))
6910 -- An Ada 2012 stand-alone object of an anonymous access type
6913 Loc
: constant Source_Ptr
:= Sloc
(N
);
6915 Level
: constant Entity_Id
:=
6916 Make_Defining_Identifier
(Sloc
(N
),
6918 New_External_Name
(Chars
(Def_Id
), Suffix
=> "L"));
6920 Level_Expr
: Node_Id
;
6921 Level_Decl
: Node_Id
;
6924 Set_Ekind
(Level
, Ekind
(Def_Id
));
6925 Set_Etype
(Level
, Standard_Natural
);
6926 Set_Scope
(Level
, Scope
(Def_Id
));
6930 -- Set accessibility level of null
6933 Make_Integer_Literal
(Loc
, Scope_Depth
(Standard_Standard
));
6936 Level_Expr
:= Dynamic_Accessibility_Level
(Expr
);
6940 Make_Object_Declaration
(Loc
,
6941 Defining_Identifier
=> Level
,
6942 Object_Definition
=>
6943 New_Occurrence_Of
(Standard_Natural
, Loc
),
6944 Expression
=> Level_Expr
,
6945 Constant_Present
=> Constant_Present
(N
),
6946 Has_Init_Expression
=> True);
6948 Insert_Action_After
(Init_After
, Level_Decl
);
6950 Set_Extra_Accessibility
(Def_Id
, Level
);
6954 -- If the object is default initialized and its type is subject to
6955 -- pragma Default_Initial_Condition, add a runtime check to verify
6956 -- the assumption of the pragma (SPARK RM 7.3.3). Generate:
6958 -- <Base_Typ>Default_Init_Cond (<Base_Typ> (Def_Id));
6960 -- Note that the check is generated for source objects only
6962 if Comes_From_Source
(Def_Id
)
6963 and then (Has_Default_Init_Cond
(Typ
)
6965 Has_Inherited_Default_Init_Cond
(Typ
))
6966 and then not Has_Init_Expression
(N
)
6969 DIC_Call
: constant Node_Id
:=
6970 Build_Default_Init_Cond_Call
(Loc
, Def_Id
, Typ
);
6972 if Present
(Next_N
) then
6973 Insert_Before_And_Analyze
(Next_N
, DIC_Call
);
6975 -- The object declaration is the last node in a declarative or a
6979 Append_To
(List_Containing
(N
), DIC_Call
);
6985 -- Final transformation - turn the object declaration into a renaming
6986 -- if appropriate. If this is the completion of a deferred constant
6987 -- declaration, then this transformation generates what would be
6988 -- illegal code if written by hand, but that's OK.
6990 if Present
(Expr
) then
6991 if Rewrite_As_Renaming
then
6993 Make_Object_Renaming_Declaration
(Loc
,
6994 Defining_Identifier
=> Defining_Identifier
(N
),
6995 Subtype_Mark
=> Obj_Def
,
6998 -- We do not analyze this renaming declaration, because all its
6999 -- components have already been analyzed, and if we were to go
7000 -- ahead and analyze it, we would in effect be trying to generate
7001 -- another declaration of X, which won't do.
7003 Set_Renamed_Object
(Defining_Identifier
(N
), Expr_Q
);
7006 -- We do need to deal with debug issues for this renaming
7008 -- First, if entity comes from source, then mark it as needing
7009 -- debug information, even though it is defined by a generated
7010 -- renaming that does not come from source.
7012 if Comes_From_Source
(Defining_Identifier
(N
)) then
7013 Set_Debug_Info_Needed
(Defining_Identifier
(N
));
7016 -- Now call the routine to generate debug info for the renaming
7019 Decl
: constant Node_Id
:= Debug_Renaming_Declaration
(N
);
7021 if Present
(Decl
) then
7022 Insert_Action
(N
, Decl
);
7028 -- Exception on library entity not available
7031 when RE_Not_Available
=>
7033 end Expand_N_Object_Declaration
;
7035 ---------------------------------
7036 -- Expand_N_Subtype_Indication --
7037 ---------------------------------
7039 -- Add a check on the range of the subtype. The static case is partially
7040 -- duplicated by Process_Range_Expr_In_Decl in Sem_Ch3, but we still need
7041 -- to check here for the static case in order to avoid generating
7042 -- extraneous expanded code. Also deal with validity checking.
7044 procedure Expand_N_Subtype_Indication
(N
: Node_Id
) is
7045 Ran
: constant Node_Id
:= Range_Expression
(Constraint
(N
));
7046 Typ
: constant Entity_Id
:= Entity
(Subtype_Mark
(N
));
7049 if Nkind
(Constraint
(N
)) = N_Range_Constraint
then
7050 Validity_Check_Range
(Range_Expression
(Constraint
(N
)));
7053 if Nkind_In
(Parent
(N
), N_Constrained_Array_Definition
, N_Slice
) then
7054 Apply_Range_Check
(Ran
, Typ
);
7056 end Expand_N_Subtype_Indication
;
7058 ---------------------------
7059 -- Expand_N_Variant_Part --
7060 ---------------------------
7062 -- Note: this procedure no longer has any effect. It used to be that we
7063 -- would replace the choices in the last variant by a when others, and
7064 -- also expanded static predicates in variant choices here, but both of
7065 -- those activities were being done too early, since we can't check the
7066 -- choices until the statically predicated subtypes are frozen, which can
7067 -- happen as late as the free point of the record, and we can't change the
7068 -- last choice to an others before checking the choices, which is now done
7069 -- at the freeze point of the record.
7071 procedure Expand_N_Variant_Part
(N
: Node_Id
) is
7074 end Expand_N_Variant_Part
;
7076 ---------------------------------
7077 -- Expand_Previous_Access_Type --
7078 ---------------------------------
7080 procedure Expand_Previous_Access_Type
(Def_Id
: Entity_Id
) is
7081 Ptr_Typ
: Entity_Id
;
7084 -- Find all access types in the current scope whose designated type is
7085 -- Def_Id and build master renamings for them.
7087 Ptr_Typ
:= First_Entity
(Current_Scope
);
7088 while Present
(Ptr_Typ
) loop
7089 if Is_Access_Type
(Ptr_Typ
)
7090 and then Designated_Type
(Ptr_Typ
) = Def_Id
7091 and then No
(Master_Id
(Ptr_Typ
))
7093 -- Ensure that the designated type has a master
7095 Build_Master_Entity
(Def_Id
);
7097 -- Private and incomplete types complicate the insertion of master
7098 -- renamings because the access type may precede the full view of
7099 -- the designated type. For this reason, the master renamings are
7100 -- inserted relative to the designated type.
7102 Build_Master_Renaming
(Ptr_Typ
, Ins_Nod
=> Parent
(Def_Id
));
7105 Next_Entity
(Ptr_Typ
);
7107 end Expand_Previous_Access_Type
;
7109 -----------------------------
7110 -- Expand_Record_Extension --
7111 -----------------------------
7113 -- Add a field _parent at the beginning of the record extension. This is
7114 -- used to implement inheritance. Here are some examples of expansion:
7116 -- 1. no discriminants
7117 -- type T2 is new T1 with null record;
7119 -- type T2 is new T1 with record
7123 -- 2. renamed discriminants
7124 -- type T2 (B, C : Int) is new T1 (A => B) with record
7125 -- _Parent : T1 (A => B);
7129 -- 3. inherited discriminants
7130 -- type T2 is new T1 with record -- discriminant A inherited
7131 -- _Parent : T1 (A);
7135 procedure Expand_Record_Extension
(T
: Entity_Id
; Def
: Node_Id
) is
7136 Indic
: constant Node_Id
:= Subtype_Indication
(Def
);
7137 Loc
: constant Source_Ptr
:= Sloc
(Def
);
7138 Rec_Ext_Part
: Node_Id
:= Record_Extension_Part
(Def
);
7139 Par_Subtype
: Entity_Id
;
7140 Comp_List
: Node_Id
;
7141 Comp_Decl
: Node_Id
;
7144 List_Constr
: constant List_Id
:= New_List
;
7147 -- Expand_Record_Extension is called directly from the semantics, so
7148 -- we must check to see whether expansion is active before proceeding,
7149 -- because this affects the visibility of selected components in bodies
7152 if not Expander_Active
then
7156 -- This may be a derivation of an untagged private type whose full
7157 -- view is tagged, in which case the Derived_Type_Definition has no
7158 -- extension part. Build an empty one now.
7160 if No
(Rec_Ext_Part
) then
7162 Make_Record_Definition
(Loc
,
7164 Component_List
=> Empty
,
7165 Null_Present
=> True);
7167 Set_Record_Extension_Part
(Def
, Rec_Ext_Part
);
7168 Mark_Rewrite_Insertion
(Rec_Ext_Part
);
7171 Comp_List
:= Component_List
(Rec_Ext_Part
);
7173 Parent_N
:= Make_Defining_Identifier
(Loc
, Name_uParent
);
7175 -- If the derived type inherits its discriminants the type of the
7176 -- _parent field must be constrained by the inherited discriminants
7178 if Has_Discriminants
(T
)
7179 and then Nkind
(Indic
) /= N_Subtype_Indication
7180 and then not Is_Constrained
(Entity
(Indic
))
7182 D
:= First_Discriminant
(T
);
7183 while Present
(D
) loop
7184 Append_To
(List_Constr
, New_Occurrence_Of
(D
, Loc
));
7185 Next_Discriminant
(D
);
7190 Make_Subtype_Indication
(Loc
,
7191 Subtype_Mark
=> New_Occurrence_Of
(Entity
(Indic
), Loc
),
7193 Make_Index_Or_Discriminant_Constraint
(Loc
,
7194 Constraints
=> List_Constr
)),
7197 -- Otherwise the original subtype_indication is just what is needed
7200 Par_Subtype
:= Process_Subtype
(New_Copy_Tree
(Indic
), Def
);
7203 Set_Parent_Subtype
(T
, Par_Subtype
);
7206 Make_Component_Declaration
(Loc
,
7207 Defining_Identifier
=> Parent_N
,
7208 Component_Definition
=>
7209 Make_Component_Definition
(Loc
,
7210 Aliased_Present
=> False,
7211 Subtype_Indication
=> New_Occurrence_Of
(Par_Subtype
, Loc
)));
7213 if Null_Present
(Rec_Ext_Part
) then
7214 Set_Component_List
(Rec_Ext_Part
,
7215 Make_Component_List
(Loc
,
7216 Component_Items
=> New_List
(Comp_Decl
),
7217 Variant_Part
=> Empty
,
7218 Null_Present
=> False));
7219 Set_Null_Present
(Rec_Ext_Part
, False);
7221 elsif Null_Present
(Comp_List
)
7222 or else Is_Empty_List
(Component_Items
(Comp_List
))
7224 Set_Component_Items
(Comp_List
, New_List
(Comp_Decl
));
7225 Set_Null_Present
(Comp_List
, False);
7228 Insert_Before
(First
(Component_Items
(Comp_List
)), Comp_Decl
);
7231 Analyze
(Comp_Decl
);
7232 end Expand_Record_Extension
;
7234 ------------------------
7235 -- Expand_Tagged_Root --
7236 ------------------------
7238 procedure Expand_Tagged_Root
(T
: Entity_Id
) is
7239 Def
: constant Node_Id
:= Type_Definition
(Parent
(T
));
7240 Comp_List
: Node_Id
;
7241 Comp_Decl
: Node_Id
;
7242 Sloc_N
: Source_Ptr
;
7245 if Null_Present
(Def
) then
7246 Set_Component_List
(Def
,
7247 Make_Component_List
(Sloc
(Def
),
7248 Component_Items
=> Empty_List
,
7249 Variant_Part
=> Empty
,
7250 Null_Present
=> True));
7253 Comp_List
:= Component_List
(Def
);
7255 if Null_Present
(Comp_List
)
7256 or else Is_Empty_List
(Component_Items
(Comp_List
))
7258 Sloc_N
:= Sloc
(Comp_List
);
7260 Sloc_N
:= Sloc
(First
(Component_Items
(Comp_List
)));
7264 Make_Component_Declaration
(Sloc_N
,
7265 Defining_Identifier
=> First_Tag_Component
(T
),
7266 Component_Definition
=>
7267 Make_Component_Definition
(Sloc_N
,
7268 Aliased_Present
=> False,
7269 Subtype_Indication
=> New_Occurrence_Of
(RTE
(RE_Tag
), Sloc_N
)));
7271 if Null_Present
(Comp_List
)
7272 or else Is_Empty_List
(Component_Items
(Comp_List
))
7274 Set_Component_Items
(Comp_List
, New_List
(Comp_Decl
));
7275 Set_Null_Present
(Comp_List
, False);
7278 Insert_Before
(First
(Component_Items
(Comp_List
)), Comp_Decl
);
7281 -- We don't Analyze the whole expansion because the tag component has
7282 -- already been analyzed previously. Here we just insure that the tree
7283 -- is coherent with the semantic decoration
7285 Find_Type
(Subtype_Indication
(Component_Definition
(Comp_Decl
)));
7288 when RE_Not_Available
=>
7290 end Expand_Tagged_Root
;
7292 ------------------------------
7293 -- Freeze_Stream_Operations --
7294 ------------------------------
7296 procedure Freeze_Stream_Operations
(N
: Node_Id
; Typ
: Entity_Id
) is
7297 Names
: constant array (1 .. 4) of TSS_Name_Type
:=
7302 Stream_Op
: Entity_Id
;
7305 -- Primitive operations of tagged types are frozen when the dispatch
7306 -- table is constructed.
7308 if not Comes_From_Source
(Typ
) or else Is_Tagged_Type
(Typ
) then
7312 for J
in Names
'Range loop
7313 Stream_Op
:= TSS
(Typ
, Names
(J
));
7315 if Present
(Stream_Op
)
7316 and then Is_Subprogram
(Stream_Op
)
7317 and then Nkind
(Unit_Declaration_Node
(Stream_Op
)) =
7318 N_Subprogram_Declaration
7319 and then not Is_Frozen
(Stream_Op
)
7321 Append_Freeze_Actions
(Typ
, Freeze_Entity
(Stream_Op
, N
));
7324 end Freeze_Stream_Operations
;
7330 -- Full type declarations are expanded at the point at which the type is
7331 -- frozen. The formal N is the Freeze_Node for the type. Any statements or
7332 -- declarations generated by the freezing (e.g. the procedure generated
7333 -- for initialization) are chained in the Actions field list of the freeze
7334 -- node using Append_Freeze_Actions.
7336 function Freeze_Type
(N
: Node_Id
) return Boolean is
7337 procedure Process_RACW_Types
(Typ
: Entity_Id
);
7338 -- Validate and generate stubs for all RACW types associated with type
7341 procedure Process_Pending_Access_Types
(Typ
: Entity_Id
);
7342 -- Associate type Typ's Finalize_Address primitive with the finalization
7343 -- masters of pending access-to-Typ types.
7345 ------------------------
7346 -- Process_RACW_Types --
7347 ------------------------
7349 procedure Process_RACW_Types
(Typ
: Entity_Id
) is
7350 List
: constant Elist_Id
:= Access_Types_To_Process
(N
);
7352 Seen
: Boolean := False;
7355 if Present
(List
) then
7356 E
:= First_Elmt
(List
);
7357 while Present
(E
) loop
7358 if Is_Remote_Access_To_Class_Wide_Type
(Node
(E
)) then
7359 Validate_RACW_Primitives
(Node
(E
));
7367 -- If there are RACWs designating this type, make stubs now
7370 Remote_Types_Tagged_Full_View_Encountered
(Typ
);
7372 end Process_RACW_Types
;
7374 ----------------------------------
7375 -- Process_Pending_Access_Types --
7376 ----------------------------------
7378 procedure Process_Pending_Access_Types
(Typ
: Entity_Id
) is
7382 -- Finalize_Address is not generated in CodePeer mode because the
7383 -- body contains address arithmetic. This processing is disabled.
7385 if CodePeer_Mode
then
7388 -- Certain itypes are generated for contexts that cannot allocate
7389 -- objects and should not set primitive Finalize_Address.
7391 elsif Is_Itype
(Typ
)
7392 and then Nkind
(Associated_Node_For_Itype
(Typ
)) =
7393 N_Explicit_Dereference
7397 -- When an access type is declared after the incomplete view of a
7398 -- Taft-amendment type, the access type is considered pending in
7399 -- case the full view of the Taft-amendment type is controlled. If
7400 -- this is indeed the case, associate the Finalize_Address routine
7401 -- of the full view with the finalization masters of all pending
7402 -- access types. This scenario applies to anonymous access types as
7405 elsif Needs_Finalization
(Typ
)
7406 and then Present
(Pending_Access_Types
(Typ
))
7408 E
:= First_Elmt
(Pending_Access_Types
(Typ
));
7409 while Present
(E
) loop
7412 -- Set_Finalize_Address
7413 -- (Ptr_Typ, <Typ>FD'Unrestricted_Access);
7415 Append_Freeze_Action
(Typ
,
7416 Make_Set_Finalize_Address_Call
7418 Ptr_Typ
=> Node
(E
)));
7423 end Process_Pending_Access_Types
;
7427 Def_Id
: constant Entity_Id
:= Entity
(N
);
7428 Result
: Boolean := False;
7430 Save_Ghost_Mode
: constant Ghost_Mode_Type
:= Ghost_Mode
;
7432 -- Start of processing for Freeze_Type
7435 -- The type being frozen may be subject to pragma Ghost. Set the mode
7436 -- now to ensure that any nodes generated during freezing are properly
7439 Set_Ghost_Mode
(N
, Def_Id
);
7441 -- Process any remote access-to-class-wide types designating the type
7444 Process_RACW_Types
(Def_Id
);
7446 -- Freeze processing for record types
7448 if Is_Record_Type
(Def_Id
) then
7449 if Ekind
(Def_Id
) = E_Record_Type
then
7450 Expand_Freeze_Record_Type
(N
);
7451 elsif Is_Class_Wide_Type
(Def_Id
) then
7452 Expand_Freeze_Class_Wide_Type
(N
);
7455 -- Freeze processing for array types
7457 elsif Is_Array_Type
(Def_Id
) then
7458 Expand_Freeze_Array_Type
(N
);
7460 -- Freeze processing for access types
7462 -- For pool-specific access types, find out the pool object used for
7463 -- this type, needs actual expansion of it in some cases. Here are the
7464 -- different cases :
7466 -- 1. Rep Clause "for Def_Id'Storage_Size use 0;"
7467 -- ---> don't use any storage pool
7469 -- 2. Rep Clause : for Def_Id'Storage_Size use Expr.
7471 -- Def_Id__Pool : Stack_Bounded_Pool (Expr, DT'Size, DT'Alignment);
7473 -- 3. Rep Clause "for Def_Id'Storage_Pool use a_Pool_Object"
7474 -- ---> Storage Pool is the specified one
7476 -- See GNAT Pool packages in the Run-Time for more details
7478 elsif Ekind_In
(Def_Id
, E_Access_Type
, E_General_Access_Type
) then
7480 Loc
: constant Source_Ptr
:= Sloc
(N
);
7481 Desig_Type
: constant Entity_Id
:= Designated_Type
(Def_Id
);
7482 Pool_Object
: Entity_Id
;
7484 Freeze_Action_Typ
: Entity_Id
;
7489 -- Rep Clause "for Def_Id'Storage_Size use 0;"
7490 -- ---> don't use any storage pool
7492 if No_Pool_Assigned
(Def_Id
) then
7497 -- Rep Clause : for Def_Id'Storage_Size use Expr.
7499 -- Def_Id__Pool : Stack_Bounded_Pool
7500 -- (Expr, DT'Size, DT'Alignment);
7502 elsif Has_Storage_Size_Clause
(Def_Id
) then
7508 -- For unconstrained composite types we give a size of zero
7509 -- so that the pool knows that it needs a special algorithm
7510 -- for variable size object allocation.
7512 if Is_Composite_Type
(Desig_Type
)
7513 and then not Is_Constrained
(Desig_Type
)
7515 DT_Size
:= Make_Integer_Literal
(Loc
, 0);
7516 DT_Align
:= Make_Integer_Literal
(Loc
, Maximum_Alignment
);
7520 Make_Attribute_Reference
(Loc
,
7521 Prefix
=> New_Occurrence_Of
(Desig_Type
, Loc
),
7522 Attribute_Name
=> Name_Max_Size_In_Storage_Elements
);
7525 Make_Attribute_Reference
(Loc
,
7526 Prefix
=> New_Occurrence_Of
(Desig_Type
, Loc
),
7527 Attribute_Name
=> Name_Alignment
);
7531 Make_Defining_Identifier
(Loc
,
7532 Chars
=> New_External_Name
(Chars
(Def_Id
), 'P'));
7534 -- We put the code associated with the pools in the entity
7535 -- that has the later freeze node, usually the access type
7536 -- but it can also be the designated_type; because the pool
7537 -- code requires both those types to be frozen
7539 if Is_Frozen
(Desig_Type
)
7540 and then (No
(Freeze_Node
(Desig_Type
))
7541 or else Analyzed
(Freeze_Node
(Desig_Type
)))
7543 Freeze_Action_Typ
:= Def_Id
;
7545 -- A Taft amendment type cannot get the freeze actions
7546 -- since the full view is not there.
7548 elsif Is_Incomplete_Or_Private_Type
(Desig_Type
)
7549 and then No
(Full_View
(Desig_Type
))
7551 Freeze_Action_Typ
:= Def_Id
;
7554 Freeze_Action_Typ
:= Desig_Type
;
7557 Append_Freeze_Action
(Freeze_Action_Typ
,
7558 Make_Object_Declaration
(Loc
,
7559 Defining_Identifier
=> Pool_Object
,
7560 Object_Definition
=>
7561 Make_Subtype_Indication
(Loc
,
7564 (RTE
(RE_Stack_Bounded_Pool
), Loc
),
7567 Make_Index_Or_Discriminant_Constraint
(Loc
,
7568 Constraints
=> New_List
(
7570 -- First discriminant is the Pool Size
7573 Storage_Size_Variable
(Def_Id
), Loc
),
7575 -- Second discriminant is the element size
7579 -- Third discriminant is the alignment
7584 Set_Associated_Storage_Pool
(Def_Id
, Pool_Object
);
7588 -- Rep Clause "for Def_Id'Storage_Pool use a_Pool_Object"
7589 -- ---> Storage Pool is the specified one
7591 -- When compiling in Ada 2012 mode, ensure that the accessibility
7592 -- level of the subpool access type is not deeper than that of the
7593 -- pool_with_subpools.
7595 elsif Ada_Version
>= Ada_2012
7596 and then Present
(Associated_Storage_Pool
(Def_Id
))
7598 -- Omit this check for the case of a configurable run-time that
7599 -- does not provide package System.Storage_Pools.Subpools.
7601 and then RTE_Available
(RE_Root_Storage_Pool_With_Subpools
)
7604 Loc
: constant Source_Ptr
:= Sloc
(Def_Id
);
7605 Pool
: constant Entity_Id
:=
7606 Associated_Storage_Pool
(Def_Id
);
7607 RSPWS
: constant Entity_Id
:=
7608 RTE
(RE_Root_Storage_Pool_With_Subpools
);
7611 -- It is known that the accessibility level of the access
7612 -- type is deeper than that of the pool.
7614 if Type_Access_Level
(Def_Id
) > Object_Access_Level
(Pool
)
7615 and then not Accessibility_Checks_Suppressed
(Def_Id
)
7616 and then not Accessibility_Checks_Suppressed
(Pool
)
7618 -- Static case: the pool is known to be a descendant of
7619 -- Root_Storage_Pool_With_Subpools.
7621 if Is_Ancestor
(RSPWS
, Etype
(Pool
)) then
7623 ("??subpool access type has deeper accessibility "
7624 & "level than pool", Def_Id
);
7626 Append_Freeze_Action
(Def_Id
,
7627 Make_Raise_Program_Error
(Loc
,
7628 Reason
=> PE_Accessibility_Check_Failed
));
7630 -- Dynamic case: when the pool is of a class-wide type,
7631 -- it may or may not support subpools depending on the
7632 -- path of derivation. Generate:
7634 -- if Def_Id in RSPWS'Class then
7635 -- raise Program_Error;
7638 elsif Is_Class_Wide_Type
(Etype
(Pool
)) then
7639 Append_Freeze_Action
(Def_Id
,
7640 Make_If_Statement
(Loc
,
7643 Left_Opnd
=> New_Occurrence_Of
(Pool
, Loc
),
7646 (Class_Wide_Type
(RSPWS
), Loc
)),
7648 Then_Statements
=> New_List
(
7649 Make_Raise_Program_Error
(Loc
,
7650 Reason
=> PE_Accessibility_Check_Failed
))));
7656 -- For access-to-controlled types (including class-wide types and
7657 -- Taft-amendment types, which potentially have controlled
7658 -- components), expand the list controller object that will store
7659 -- the dynamically allocated objects. Don't do this transformation
7660 -- for expander-generated access types, but do it for types that
7661 -- are the full view of types derived from other private types.
7662 -- Also suppress the list controller in the case of a designated
7663 -- type with convention Java, since this is used when binding to
7664 -- Java API specs, where there's no equivalent of a finalization
7665 -- list and we don't want to pull in the finalization support if
7668 if not Comes_From_Source
(Def_Id
)
7669 and then not Has_Private_Declaration
(Def_Id
)
7673 -- An exception is made for types defined in the run-time because
7674 -- Ada.Tags.Tag itself is such a type and cannot afford this
7675 -- unnecessary overhead that would generates a loop in the
7676 -- expansion scheme. Another exception is if Restrictions
7677 -- (No_Finalization) is active, since then we know nothing is
7680 elsif Restriction_Active
(No_Finalization
)
7681 or else In_Runtime
(Def_Id
)
7685 -- Create a finalization master for an access-to-controlled type
7686 -- or an access-to-incomplete type. It is assumed that the full
7687 -- view will be controlled.
7689 elsif Needs_Finalization
(Desig_Type
)
7690 or else (Is_Incomplete_Type
(Desig_Type
)
7691 and then No
(Full_View
(Desig_Type
)))
7693 Build_Finalization_Master
(Def_Id
);
7695 -- Create a finalization master when the designated type contains
7696 -- a private component. It is assumed that the full view will be
7699 elsif Has_Private_Component
(Desig_Type
) then
7700 Build_Finalization_Master
7702 For_Private
=> True,
7703 Context_Scope
=> Scope
(Def_Id
),
7704 Insertion_Node
=> Declaration_Node
(Desig_Type
));
7708 -- Freeze processing for enumeration types
7710 elsif Ekind
(Def_Id
) = E_Enumeration_Type
then
7712 -- We only have something to do if we have a non-standard
7713 -- representation (i.e. at least one literal whose pos value
7714 -- is not the same as its representation)
7716 if Has_Non_Standard_Rep
(Def_Id
) then
7717 Expand_Freeze_Enumeration_Type
(N
);
7720 -- Private types that are completed by a derivation from a private
7721 -- type have an internally generated full view, that needs to be
7722 -- frozen. This must be done explicitly because the two views share
7723 -- the freeze node, and the underlying full view is not visible when
7724 -- the freeze node is analyzed.
7726 elsif Is_Private_Type
(Def_Id
)
7727 and then Is_Derived_Type
(Def_Id
)
7728 and then Present
(Full_View
(Def_Id
))
7729 and then Is_Itype
(Full_View
(Def_Id
))
7730 and then Has_Private_Declaration
(Full_View
(Def_Id
))
7731 and then Freeze_Node
(Full_View
(Def_Id
)) = N
7733 Set_Entity
(N
, Full_View
(Def_Id
));
7734 Result
:= Freeze_Type
(N
);
7735 Set_Entity
(N
, Def_Id
);
7737 -- All other types require no expander action. There are such cases
7738 -- (e.g. task types and protected types). In such cases, the freeze
7739 -- nodes are there for use by Gigi.
7743 -- Complete the initialization of all pending access types' finalization
7744 -- masters now that the designated type has been is frozen and primitive
7745 -- Finalize_Address generated.
7747 Process_Pending_Access_Types
(Def_Id
);
7748 Freeze_Stream_Operations
(N
, Def_Id
);
7750 Ghost_Mode
:= Save_Ghost_Mode
;
7754 when RE_Not_Available
=>
7755 Ghost_Mode
:= Save_Ghost_Mode
;
7759 -------------------------
7760 -- Get_Simple_Init_Val --
7761 -------------------------
7763 function Get_Simple_Init_Val
7766 Size
: Uint
:= No_Uint
) return Node_Id
7768 Loc
: constant Source_Ptr
:= Sloc
(N
);
7774 -- This is the size to be used for computation of the appropriate
7775 -- initial value for the Normalize_Scalars and Initialize_Scalars case.
7777 IV_Attribute
: constant Boolean :=
7778 Nkind
(N
) = N_Attribute_Reference
7779 and then Attribute_Name
(N
) = Name_Invalid_Value
;
7783 -- These are the values computed by the procedure Check_Subtype_Bounds
7785 procedure Check_Subtype_Bounds
;
7786 -- This procedure examines the subtype T, and its ancestor subtypes and
7787 -- derived types to determine the best known information about the
7788 -- bounds of the subtype. After the call Lo_Bound is set either to
7789 -- No_Uint if no information can be determined, or to a value which
7790 -- represents a known low bound, i.e. a valid value of the subtype can
7791 -- not be less than this value. Hi_Bound is similarly set to a known
7792 -- high bound (valid value cannot be greater than this).
7794 --------------------------
7795 -- Check_Subtype_Bounds --
7796 --------------------------
7798 procedure Check_Subtype_Bounds
is
7807 Lo_Bound
:= No_Uint
;
7808 Hi_Bound
:= No_Uint
;
7810 -- Loop to climb ancestor subtypes and derived types
7814 if not Is_Discrete_Type
(ST1
) then
7818 Lo
:= Type_Low_Bound
(ST1
);
7819 Hi
:= Type_High_Bound
(ST1
);
7821 if Compile_Time_Known_Value
(Lo
) then
7822 Loval
:= Expr_Value
(Lo
);
7824 if Lo_Bound
= No_Uint
or else Lo_Bound
< Loval
then
7829 if Compile_Time_Known_Value
(Hi
) then
7830 Hival
:= Expr_Value
(Hi
);
7832 if Hi_Bound
= No_Uint
or else Hi_Bound
> Hival
then
7837 ST2
:= Ancestor_Subtype
(ST1
);
7843 exit when ST1
= ST2
;
7846 end Check_Subtype_Bounds
;
7848 -- Start of processing for Get_Simple_Init_Val
7851 -- For a private type, we should always have an underlying type (because
7852 -- this was already checked in Needs_Simple_Initialization). What we do
7853 -- is to get the value for the underlying type and then do an unchecked
7854 -- conversion to the private type.
7856 if Is_Private_Type
(T
) then
7857 Val
:= Get_Simple_Init_Val
(Underlying_Type
(T
), N
, Size
);
7859 -- A special case, if the underlying value is null, then qualify it
7860 -- with the underlying type, so that the null is properly typed.
7861 -- Similarly, if it is an aggregate it must be qualified, because an
7862 -- unchecked conversion does not provide a context for it.
7864 if Nkind_In
(Val
, N_Null
, N_Aggregate
) then
7866 Make_Qualified_Expression
(Loc
,
7868 New_Occurrence_Of
(Underlying_Type
(T
), Loc
),
7872 Result
:= Unchecked_Convert_To
(T
, Val
);
7874 -- Don't truncate result (important for Initialize/Normalize_Scalars)
7876 if Nkind
(Result
) = N_Unchecked_Type_Conversion
7877 and then Is_Scalar_Type
(Underlying_Type
(T
))
7879 Set_No_Truncation
(Result
);
7884 -- Scalars with Default_Value aspect. The first subtype may now be
7885 -- private, so retrieve value from underlying type.
7887 elsif Is_Scalar_Type
(T
) and then Has_Default_Aspect
(T
) then
7888 if Is_Private_Type
(First_Subtype
(T
)) then
7889 return Unchecked_Convert_To
(T
,
7890 Default_Aspect_Value
(Full_View
(First_Subtype
(T
))));
7893 Convert_To
(T
, Default_Aspect_Value
(First_Subtype
(T
)));
7896 -- Otherwise, for scalars, we must have normalize/initialize scalars
7897 -- case, or if the node N is an 'Invalid_Value attribute node.
7899 elsif Is_Scalar_Type
(T
) then
7900 pragma Assert
(Init_Or_Norm_Scalars
or IV_Attribute
);
7902 -- Compute size of object. If it is given by the caller, we can use
7903 -- it directly, otherwise we use Esize (T) as an estimate. As far as
7904 -- we know this covers all cases correctly.
7906 if Size
= No_Uint
or else Size
<= Uint_0
then
7907 Size_To_Use
:= UI_Max
(Uint_1
, Esize
(T
));
7909 Size_To_Use
:= Size
;
7912 -- Maximum size to use is 64 bits, since we will create values of
7913 -- type Unsigned_64 and the range must fit this type.
7915 if Size_To_Use
/= No_Uint
and then Size_To_Use
> Uint_64
then
7916 Size_To_Use
:= Uint_64
;
7919 -- Check known bounds of subtype
7921 Check_Subtype_Bounds
;
7923 -- Processing for Normalize_Scalars case
7925 if Normalize_Scalars
and then not IV_Attribute
then
7927 -- If zero is invalid, it is a convenient value to use that is
7928 -- for sure an appropriate invalid value in all situations.
7930 if Lo_Bound
/= No_Uint
and then Lo_Bound
> Uint_0
then
7931 Val
:= Make_Integer_Literal
(Loc
, 0);
7933 -- Cases where all one bits is the appropriate invalid value
7935 -- For modular types, all 1 bits is either invalid or valid. If
7936 -- it is valid, then there is nothing that can be done since there
7937 -- are no invalid values (we ruled out zero already).
7939 -- For signed integer types that have no negative values, either
7940 -- there is room for negative values, or there is not. If there
7941 -- is, then all 1-bits may be interpreted as minus one, which is
7942 -- certainly invalid. Alternatively it is treated as the largest
7943 -- positive value, in which case the observation for modular types
7946 -- For float types, all 1-bits is a NaN (not a number), which is
7947 -- certainly an appropriately invalid value.
7949 elsif Is_Unsigned_Type
(T
)
7950 or else Is_Floating_Point_Type
(T
)
7951 or else Is_Enumeration_Type
(T
)
7953 Val
:= Make_Integer_Literal
(Loc
, 2 ** Size_To_Use
- 1);
7955 -- Resolve as Unsigned_64, because the largest number we can
7956 -- generate is out of range of universal integer.
7958 Analyze_And_Resolve
(Val
, RTE
(RE_Unsigned_64
));
7960 -- Case of signed types
7964 Signed_Size
: constant Uint
:=
7965 UI_Min
(Uint_63
, Size_To_Use
- 1);
7968 -- Normally we like to use the most negative number. The one
7969 -- exception is when this number is in the known subtype
7970 -- range and the largest positive number is not in the known
7973 -- For this exceptional case, use largest positive value
7975 if Lo_Bound
/= No_Uint
and then Hi_Bound
/= No_Uint
7976 and then Lo_Bound
<= (-(2 ** Signed_Size
))
7977 and then Hi_Bound
< 2 ** Signed_Size
7979 Val
:= Make_Integer_Literal
(Loc
, 2 ** Signed_Size
- 1);
7981 -- Normal case of largest negative value
7984 Val
:= Make_Integer_Literal
(Loc
, -(2 ** Signed_Size
));
7989 -- Here for Initialize_Scalars case (or Invalid_Value attribute used)
7992 -- For float types, use float values from System.Scalar_Values
7994 if Is_Floating_Point_Type
(T
) then
7995 if Root_Type
(T
) = Standard_Short_Float
then
7996 Val_RE
:= RE_IS_Isf
;
7997 elsif Root_Type
(T
) = Standard_Float
then
7998 Val_RE
:= RE_IS_Ifl
;
7999 elsif Root_Type
(T
) = Standard_Long_Float
then
8000 Val_RE
:= RE_IS_Ilf
;
8001 else pragma Assert
(Root_Type
(T
) = Standard_Long_Long_Float
);
8002 Val_RE
:= RE_IS_Ill
;
8005 -- If zero is invalid, use zero values from System.Scalar_Values
8007 elsif Lo_Bound
/= No_Uint
and then Lo_Bound
> Uint_0
then
8008 if Size_To_Use
<= 8 then
8009 Val_RE
:= RE_IS_Iz1
;
8010 elsif Size_To_Use
<= 16 then
8011 Val_RE
:= RE_IS_Iz2
;
8012 elsif Size_To_Use
<= 32 then
8013 Val_RE
:= RE_IS_Iz4
;
8015 Val_RE
:= RE_IS_Iz8
;
8018 -- For unsigned, use unsigned values from System.Scalar_Values
8020 elsif Is_Unsigned_Type
(T
) then
8021 if Size_To_Use
<= 8 then
8022 Val_RE
:= RE_IS_Iu1
;
8023 elsif Size_To_Use
<= 16 then
8024 Val_RE
:= RE_IS_Iu2
;
8025 elsif Size_To_Use
<= 32 then
8026 Val_RE
:= RE_IS_Iu4
;
8028 Val_RE
:= RE_IS_Iu8
;
8031 -- For signed, use signed values from System.Scalar_Values
8034 if Size_To_Use
<= 8 then
8035 Val_RE
:= RE_IS_Is1
;
8036 elsif Size_To_Use
<= 16 then
8037 Val_RE
:= RE_IS_Is2
;
8038 elsif Size_To_Use
<= 32 then
8039 Val_RE
:= RE_IS_Is4
;
8041 Val_RE
:= RE_IS_Is8
;
8045 Val
:= New_Occurrence_Of
(RTE
(Val_RE
), Loc
);
8048 -- The final expression is obtained by doing an unchecked conversion
8049 -- of this result to the base type of the required subtype. Use the
8050 -- base type to prevent the unchecked conversion from chopping bits,
8051 -- and then we set Kill_Range_Check to preserve the "bad" value.
8053 Result
:= Unchecked_Convert_To
(Base_Type
(T
), Val
);
8055 -- Ensure result is not truncated, since we want the "bad" bits, and
8056 -- also kill range check on result.
8058 if Nkind
(Result
) = N_Unchecked_Type_Conversion
then
8059 Set_No_Truncation
(Result
);
8060 Set_Kill_Range_Check
(Result
, True);
8065 -- String or Wide_[Wide]_String (must have Initialize_Scalars set)
8067 elsif Is_Standard_String_Type
(T
) then
8068 pragma Assert
(Init_Or_Norm_Scalars
);
8071 Make_Aggregate
(Loc
,
8072 Component_Associations
=> New_List
(
8073 Make_Component_Association
(Loc
,
8074 Choices
=> New_List
(
8075 Make_Others_Choice
(Loc
)),
8078 (Component_Type
(T
), N
, Esize
(Root_Type
(T
))))));
8080 -- Access type is initialized to null
8082 elsif Is_Access_Type
(T
) then
8083 return Make_Null
(Loc
);
8085 -- No other possibilities should arise, since we should only be calling
8086 -- Get_Simple_Init_Val if Needs_Simple_Initialization returned True,
8087 -- indicating one of the above cases held.
8090 raise Program_Error
;
8094 when RE_Not_Available
=>
8096 end Get_Simple_Init_Val
;
8098 ------------------------------
8099 -- Has_New_Non_Standard_Rep --
8100 ------------------------------
8102 function Has_New_Non_Standard_Rep
(T
: Entity_Id
) return Boolean is
8104 if not Is_Derived_Type
(T
) then
8105 return Has_Non_Standard_Rep
(T
)
8106 or else Has_Non_Standard_Rep
(Root_Type
(T
));
8108 -- If Has_Non_Standard_Rep is not set on the derived type, the
8109 -- representation is fully inherited.
8111 elsif not Has_Non_Standard_Rep
(T
) then
8115 return First_Rep_Item
(T
) /= First_Rep_Item
(Root_Type
(T
));
8117 -- May need a more precise check here: the First_Rep_Item may be a
8118 -- stream attribute, which does not affect the representation of the
8122 end Has_New_Non_Standard_Rep
;
8124 ----------------------
8125 -- Inline_Init_Proc --
8126 ----------------------
8128 function Inline_Init_Proc
(Typ
: Entity_Id
) return Boolean is
8130 -- The initialization proc of protected records is not worth inlining.
8131 -- In addition, when compiled for another unit for inlining purposes,
8132 -- it may make reference to entities that have not been elaborated yet.
8133 -- The initialization proc of records that need finalization contains
8134 -- a nested clean-up procedure that makes it impractical to inline as
8135 -- well, except for simple controlled types themselves. And similar
8136 -- considerations apply to task types.
8138 if Is_Concurrent_Type
(Typ
) then
8141 elsif Needs_Finalization
(Typ
) and then not Is_Controlled
(Typ
) then
8144 elsif Has_Task
(Typ
) then
8150 end Inline_Init_Proc
;
8156 function In_Runtime
(E
: Entity_Id
) return Boolean is
8161 while Scope
(S1
) /= Standard_Standard
loop
8165 return Is_RTU
(S1
, System
) or else Is_RTU
(S1
, Ada
);
8168 ---------------------------------------
8169 -- Insert_Component_Invariant_Checks --
8170 ---------------------------------------
8172 procedure Insert_Component_Invariant_Checks
8177 Loc
: constant Source_Ptr
:= Sloc
(Typ
);
8178 Proc_Id
: Entity_Id
;
8181 if Present
(Proc
) then
8182 Proc_Id
:= Defining_Entity
(Proc
);
8184 if not Has_Invariants
(Typ
) then
8185 Set_Has_Invariants
(Typ
);
8186 Set_Is_Invariant_Procedure
(Proc_Id
);
8187 Set_Invariant_Procedure
(Typ
, Proc_Id
);
8188 Insert_After
(N
, Proc
);
8193 -- Find already created invariant subprogram, insert body of
8194 -- component invariant proc in its body, and add call after
8199 Inv_Id
: constant Entity_Id
:= Invariant_Procedure
(Typ
);
8200 Call
: constant Node_Id
:=
8201 Make_Procedure_Call_Statement
(Sloc
(N
),
8202 Name
=> New_Occurrence_Of
(Proc_Id
, Loc
),
8203 Parameter_Associations
=>
8205 (New_Occurrence_Of
(First_Formal
(Inv_Id
), Loc
)));
8208 -- The invariant body has not been analyzed yet, so we do a
8209 -- sequential search forward, and retrieve it by name.
8212 while Present
(Bod
) loop
8213 exit when Nkind
(Bod
) = N_Subprogram_Body
8214 and then Chars
(Defining_Entity
(Bod
)) = Chars
(Inv_Id
);
8218 -- If the body is not found, it is the case of an invariant
8219 -- appearing on a full declaration in a private part, in
8220 -- which case the type has been frozen but the invariant
8221 -- procedure for the composite type not created yet. Create
8225 Build_Invariant_Procedure
(Typ
, Parent
(Current_Scope
));
8226 Bod
:= Unit_Declaration_Node
8227 (Corresponding_Body
(Unit_Declaration_Node
(Inv_Id
)));
8230 Append_To
(Declarations
(Bod
), Proc
);
8231 Append_To
(Statements
(Handled_Statement_Sequence
(Bod
)), Call
);
8237 end Insert_Component_Invariant_Checks
;
8239 ----------------------------
8240 -- Initialization_Warning --
8241 ----------------------------
8243 procedure Initialization_Warning
(E
: Entity_Id
) is
8244 Warning_Needed
: Boolean;
8247 Warning_Needed
:= False;
8249 if Ekind
(Current_Scope
) = E_Package
8250 and then Static_Elaboration_Desired
(Current_Scope
)
8253 if Is_Record_Type
(E
) then
8254 if Has_Discriminants
(E
)
8255 or else Is_Limited_Type
(E
)
8256 or else Has_Non_Standard_Rep
(E
)
8258 Warning_Needed
:= True;
8261 -- Verify that at least one component has an initialization
8262 -- expression. No need for a warning on a type if all its
8263 -- components have no initialization.
8269 Comp
:= First_Component
(E
);
8270 while Present
(Comp
) loop
8271 if Ekind
(Comp
) = E_Discriminant
8273 (Nkind
(Parent
(Comp
)) = N_Component_Declaration
8274 and then Present
(Expression
(Parent
(Comp
))))
8276 Warning_Needed
:= True;
8280 Next_Component
(Comp
);
8285 if Warning_Needed
then
8287 ("Objects of the type cannot be initialized statically "
8288 & "by default??", Parent
(E
));
8293 Error_Msg_N
("Object cannot be initialized statically??", E
);
8296 end Initialization_Warning
;
8302 function Init_Formals
(Typ
: Entity_Id
) return List_Id
is
8303 Loc
: constant Source_Ptr
:= Sloc
(Typ
);
8307 -- First parameter is always _Init : in out typ. Note that we need this
8308 -- to be in/out because in the case of the task record value, there
8309 -- are default record fields (_Priority, _Size, -Task_Info) that may
8310 -- be referenced in the generated initialization routine.
8312 Formals
:= New_List
(
8313 Make_Parameter_Specification
(Loc
,
8314 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_uInit
),
8316 Out_Present
=> True,
8317 Parameter_Type
=> New_Occurrence_Of
(Typ
, Loc
)));
8319 -- For task record value, or type that contains tasks, add two more
8320 -- formals, _Master : Master_Id and _Chain : in out Activation_Chain
8321 -- We also add these parameters for the task record type case.
8324 or else (Is_Record_Type
(Typ
) and then Is_Task_Record_Type
(Typ
))
8327 Make_Parameter_Specification
(Loc
,
8328 Defining_Identifier
=>
8329 Make_Defining_Identifier
(Loc
, Name_uMaster
),
8331 New_Occurrence_Of
(RTE
(RE_Master_Id
), Loc
)));
8333 -- Add _Chain (not done for sequential elaboration policy, see
8334 -- comment for Create_Restricted_Task_Sequential in s-tarest.ads).
8336 if Partition_Elaboration_Policy
/= 'S' then
8338 Make_Parameter_Specification
(Loc
,
8339 Defining_Identifier
=>
8340 Make_Defining_Identifier
(Loc
, Name_uChain
),
8342 Out_Present
=> True,
8344 New_Occurrence_Of
(RTE
(RE_Activation_Chain
), Loc
)));
8348 Make_Parameter_Specification
(Loc
,
8349 Defining_Identifier
=>
8350 Make_Defining_Identifier
(Loc
, Name_uTask_Name
),
8352 Parameter_Type
=> New_Occurrence_Of
(Standard_String
, Loc
)));
8358 when RE_Not_Available
=>
8362 -------------------------
8363 -- Init_Secondary_Tags --
8364 -------------------------
8366 procedure Init_Secondary_Tags
8369 Stmts_List
: List_Id
;
8370 Fixed_Comps
: Boolean := True;
8371 Variable_Comps
: Boolean := True)
8373 Loc
: constant Source_Ptr
:= Sloc
(Target
);
8375 -- Inherit the C++ tag of the secondary dispatch table of Typ associated
8376 -- with Iface. Tag_Comp is the component of Typ that stores Iface_Tag.
8378 procedure Initialize_Tag
8381 Tag_Comp
: Entity_Id
;
8382 Iface_Tag
: Node_Id
);
8383 -- Initialize the tag of the secondary dispatch table of Typ associated
8384 -- with Iface. Tag_Comp is the component of Typ that stores Iface_Tag.
8385 -- Compiling under the CPP full ABI compatibility mode, if the ancestor
8386 -- of Typ CPP tagged type we generate code to inherit the contents of
8387 -- the dispatch table directly from the ancestor.
8389 --------------------
8390 -- Initialize_Tag --
8391 --------------------
8393 procedure Initialize_Tag
8396 Tag_Comp
: Entity_Id
;
8397 Iface_Tag
: Node_Id
)
8399 Comp_Typ
: Entity_Id
;
8400 Offset_To_Top_Comp
: Entity_Id
:= Empty
;
8403 -- Initialize pointer to secondary DT associated with the interface
8405 if not Is_Ancestor
(Iface
, Typ
, Use_Full_View
=> True) then
8406 Append_To
(Stmts_List
,
8407 Make_Assignment_Statement
(Loc
,
8409 Make_Selected_Component
(Loc
,
8410 Prefix
=> New_Copy_Tree
(Target
),
8411 Selector_Name
=> New_Occurrence_Of
(Tag_Comp
, Loc
)),
8413 New_Occurrence_Of
(Iface_Tag
, Loc
)));
8416 Comp_Typ
:= Scope
(Tag_Comp
);
8418 -- Initialize the entries of the table of interfaces. We generate a
8419 -- different call when the parent of the type has variable size
8422 if Comp_Typ
/= Etype
(Comp_Typ
)
8423 and then Is_Variable_Size_Record
(Etype
(Comp_Typ
))
8424 and then Chars
(Tag_Comp
) /= Name_uTag
8426 pragma Assert
(Present
(DT_Offset_To_Top_Func
(Tag_Comp
)));
8428 -- Issue error if Set_Dynamic_Offset_To_Top is not available in a
8429 -- configurable run-time environment.
8431 if not RTE_Available
(RE_Set_Dynamic_Offset_To_Top
) then
8433 ("variable size record with interface types", Typ
);
8438 -- Set_Dynamic_Offset_To_Top
8440 -- Interface_T => Iface'Tag,
8441 -- Offset_Value => n,
8442 -- Offset_Func => Fn'Address)
8444 Append_To
(Stmts_List
,
8445 Make_Procedure_Call_Statement
(Loc
,
8447 New_Occurrence_Of
(RTE
(RE_Set_Dynamic_Offset_To_Top
), Loc
),
8448 Parameter_Associations
=> New_List
(
8449 Make_Attribute_Reference
(Loc
,
8450 Prefix
=> New_Copy_Tree
(Target
),
8451 Attribute_Name
=> Name_Address
),
8453 Unchecked_Convert_To
(RTE
(RE_Tag
),
8455 (Node
(First_Elmt
(Access_Disp_Table
(Iface
))),
8458 Unchecked_Convert_To
8459 (RTE
(RE_Storage_Offset
),
8460 Make_Attribute_Reference
(Loc
,
8462 Make_Selected_Component
(Loc
,
8463 Prefix
=> New_Copy_Tree
(Target
),
8465 New_Occurrence_Of
(Tag_Comp
, Loc
)),
8466 Attribute_Name
=> Name_Position
)),
8468 Unchecked_Convert_To
(RTE
(RE_Offset_To_Top_Function_Ptr
),
8469 Make_Attribute_Reference
(Loc
,
8470 Prefix
=> New_Occurrence_Of
8471 (DT_Offset_To_Top_Func
(Tag_Comp
), Loc
),
8472 Attribute_Name
=> Name_Address
)))));
8474 -- In this case the next component stores the value of the offset
8477 Offset_To_Top_Comp
:= Next_Entity
(Tag_Comp
);
8478 pragma Assert
(Present
(Offset_To_Top_Comp
));
8480 Append_To
(Stmts_List
,
8481 Make_Assignment_Statement
(Loc
,
8483 Make_Selected_Component
(Loc
,
8484 Prefix
=> New_Copy_Tree
(Target
),
8486 New_Occurrence_Of
(Offset_To_Top_Comp
, Loc
)),
8489 Make_Attribute_Reference
(Loc
,
8491 Make_Selected_Component
(Loc
,
8492 Prefix
=> New_Copy_Tree
(Target
),
8493 Selector_Name
=> New_Occurrence_Of
(Tag_Comp
, Loc
)),
8494 Attribute_Name
=> Name_Position
)));
8496 -- Normal case: No discriminants in the parent type
8499 -- Don't need to set any value if this interface shares the
8500 -- primary dispatch table.
8502 if not Is_Ancestor
(Iface
, Typ
, Use_Full_View
=> True) then
8503 Append_To
(Stmts_List
,
8504 Build_Set_Static_Offset_To_Top
(Loc
,
8505 Iface_Tag
=> New_Occurrence_Of
(Iface_Tag
, Loc
),
8507 Unchecked_Convert_To
(RTE
(RE_Storage_Offset
),
8508 Make_Attribute_Reference
(Loc
,
8510 Make_Selected_Component
(Loc
,
8511 Prefix
=> New_Copy_Tree
(Target
),
8513 New_Occurrence_Of
(Tag_Comp
, Loc
)),
8514 Attribute_Name
=> Name_Position
))));
8518 -- Register_Interface_Offset
8520 -- Interface_T => Iface'Tag,
8521 -- Is_Constant => True,
8522 -- Offset_Value => n,
8523 -- Offset_Func => null);
8525 if RTE_Available
(RE_Register_Interface_Offset
) then
8526 Append_To
(Stmts_List
,
8527 Make_Procedure_Call_Statement
(Loc
,
8530 (RTE
(RE_Register_Interface_Offset
), Loc
),
8531 Parameter_Associations
=> New_List
(
8532 Make_Attribute_Reference
(Loc
,
8533 Prefix
=> New_Copy_Tree
(Target
),
8534 Attribute_Name
=> Name_Address
),
8536 Unchecked_Convert_To
(RTE
(RE_Tag
),
8538 (Node
(First_Elmt
(Access_Disp_Table
(Iface
))), Loc
)),
8540 New_Occurrence_Of
(Standard_True
, Loc
),
8542 Unchecked_Convert_To
(RTE
(RE_Storage_Offset
),
8543 Make_Attribute_Reference
(Loc
,
8545 Make_Selected_Component
(Loc
,
8546 Prefix
=> New_Copy_Tree
(Target
),
8548 New_Occurrence_Of
(Tag_Comp
, Loc
)),
8549 Attribute_Name
=> Name_Position
)),
8558 Full_Typ
: Entity_Id
;
8559 Ifaces_List
: Elist_Id
;
8560 Ifaces_Comp_List
: Elist_Id
;
8561 Ifaces_Tag_List
: Elist_Id
;
8562 Iface_Elmt
: Elmt_Id
;
8563 Iface_Comp_Elmt
: Elmt_Id
;
8564 Iface_Tag_Elmt
: Elmt_Id
;
8566 In_Variable_Pos
: Boolean;
8568 -- Start of processing for Init_Secondary_Tags
8571 -- Handle private types
8573 if Present
(Full_View
(Typ
)) then
8574 Full_Typ
:= Full_View
(Typ
);
8579 Collect_Interfaces_Info
8580 (Full_Typ
, Ifaces_List
, Ifaces_Comp_List
, Ifaces_Tag_List
);
8582 Iface_Elmt
:= First_Elmt
(Ifaces_List
);
8583 Iface_Comp_Elmt
:= First_Elmt
(Ifaces_Comp_List
);
8584 Iface_Tag_Elmt
:= First_Elmt
(Ifaces_Tag_List
);
8585 while Present
(Iface_Elmt
) loop
8586 Tag_Comp
:= Node
(Iface_Comp_Elmt
);
8588 -- Check if parent of record type has variable size components
8590 In_Variable_Pos
:= Scope
(Tag_Comp
) /= Etype
(Scope
(Tag_Comp
))
8591 and then Is_Variable_Size_Record
(Etype
(Scope
(Tag_Comp
)));
8593 -- If we are compiling under the CPP full ABI compatibility mode and
8594 -- the ancestor is a CPP_Pragma tagged type then we generate code to
8595 -- initialize the secondary tag components from tags that reference
8596 -- secondary tables filled with copy of parent slots.
8598 if Is_CPP_Class
(Root_Type
(Full_Typ
)) then
8600 -- Reject interface components located at variable offset in
8601 -- C++ derivations. This is currently unsupported.
8603 if not Fixed_Comps
and then In_Variable_Pos
then
8605 -- Locate the first dynamic component of the record. Done to
8606 -- improve the text of the warning.
8610 Comp_Typ
: Entity_Id
;
8613 Comp
:= First_Entity
(Typ
);
8614 while Present
(Comp
) loop
8615 Comp_Typ
:= Etype
(Comp
);
8617 if Ekind
(Comp
) /= E_Discriminant
8618 and then not Is_Tag
(Comp
)
8621 (Is_Record_Type
(Comp_Typ
)
8623 Is_Variable_Size_Record
(Base_Type
(Comp_Typ
)))
8625 (Is_Array_Type
(Comp_Typ
)
8626 and then Is_Variable_Size_Array
(Comp_Typ
));
8632 pragma Assert
(Present
(Comp
));
8633 Error_Msg_Node_2
:= Comp
;
8635 ("parent type & with dynamic component & cannot be parent"
8636 & " of 'C'P'P derivation if new interfaces are present",
8637 Typ
, Scope
(Original_Record_Component
(Comp
)));
8640 Sloc
(Scope
(Original_Record_Component
(Comp
)));
8642 ("type derived from 'C'P'P type & defined #",
8643 Typ
, Scope
(Original_Record_Component
(Comp
)));
8645 -- Avoid duplicated warnings
8650 -- Initialize secondary tags
8653 Append_To
(Stmts_List
,
8654 Make_Assignment_Statement
(Loc
,
8656 Make_Selected_Component
(Loc
,
8657 Prefix
=> New_Copy_Tree
(Target
),
8659 New_Occurrence_Of
(Node
(Iface_Comp_Elmt
), Loc
)),
8661 New_Occurrence_Of
(Node
(Iface_Tag_Elmt
), Loc
)));
8664 -- Otherwise generate code to initialize the tag
8667 if (In_Variable_Pos
and then Variable_Comps
)
8668 or else (not In_Variable_Pos
and then Fixed_Comps
)
8670 Initialize_Tag
(Full_Typ
,
8671 Iface
=> Node
(Iface_Elmt
),
8672 Tag_Comp
=> Tag_Comp
,
8673 Iface_Tag
=> Node
(Iface_Tag_Elmt
));
8677 Next_Elmt
(Iface_Elmt
);
8678 Next_Elmt
(Iface_Comp_Elmt
);
8679 Next_Elmt
(Iface_Tag_Elmt
);
8681 end Init_Secondary_Tags
;
8683 ------------------------
8684 -- Is_User_Defined_Eq --
8685 ------------------------
8687 function Is_User_Defined_Equality
(Prim
: Node_Id
) return Boolean is
8689 return Chars
(Prim
) = Name_Op_Eq
8690 and then Etype
(First_Formal
(Prim
)) =
8691 Etype
(Next_Formal
(First_Formal
(Prim
)))
8692 and then Base_Type
(Etype
(Prim
)) = Standard_Boolean
;
8693 end Is_User_Defined_Equality
;
8695 ----------------------------------------
8696 -- Make_Controlling_Function_Wrappers --
8697 ----------------------------------------
8699 procedure Make_Controlling_Function_Wrappers
8700 (Tag_Typ
: Entity_Id
;
8701 Decl_List
: out List_Id
;
8702 Body_List
: out List_Id
)
8704 Loc
: constant Source_Ptr
:= Sloc
(Tag_Typ
);
8705 Prim_Elmt
: Elmt_Id
;
8707 Actual_List
: List_Id
;
8708 Formal_List
: List_Id
;
8710 Par_Formal
: Entity_Id
;
8711 Formal_Node
: Node_Id
;
8712 Func_Body
: Node_Id
;
8713 Func_Decl
: Node_Id
;
8714 Func_Spec
: Node_Id
;
8715 Return_Stmt
: Node_Id
;
8718 Decl_List
:= New_List
;
8719 Body_List
:= New_List
;
8721 Prim_Elmt
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
8722 while Present
(Prim_Elmt
) loop
8723 Subp
:= Node
(Prim_Elmt
);
8725 -- If a primitive function with a controlling result of the type has
8726 -- not been overridden by the user, then we must create a wrapper
8727 -- function here that effectively overrides it and invokes the
8728 -- (non-abstract) parent function. This can only occur for a null
8729 -- extension. Note that functions with anonymous controlling access
8730 -- results don't qualify and must be overridden. We also exclude
8731 -- Input attributes, since each type will have its own version of
8732 -- Input constructed by the expander. The test for Comes_From_Source
8733 -- is needed to distinguish inherited operations from renamings
8734 -- (which also have Alias set). We exclude internal entities with
8735 -- Interface_Alias to avoid generating duplicated wrappers since
8736 -- the primitive which covers the interface is also available in
8737 -- the list of primitive operations.
8739 -- The function may be abstract, or require_Overriding may be set
8740 -- for it, because tests for null extensions may already have reset
8741 -- the Is_Abstract_Subprogram_Flag. If Requires_Overriding is not
8742 -- set, functions that need wrappers are recognized by having an
8743 -- alias that returns the parent type.
8745 if Comes_From_Source
(Subp
)
8746 or else No
(Alias
(Subp
))
8747 or else Present
(Interface_Alias
(Subp
))
8748 or else Ekind
(Subp
) /= E_Function
8749 or else not Has_Controlling_Result
(Subp
)
8750 or else Is_Access_Type
(Etype
(Subp
))
8751 or else Is_Abstract_Subprogram
(Alias
(Subp
))
8752 or else Is_TSS
(Subp
, TSS_Stream_Input
)
8756 elsif Is_Abstract_Subprogram
(Subp
)
8757 or else Requires_Overriding
(Subp
)
8759 (Is_Null_Extension
(Etype
(Subp
))
8760 and then Etype
(Alias
(Subp
)) /= Etype
(Subp
))
8762 Formal_List
:= No_List
;
8763 Formal
:= First_Formal
(Subp
);
8765 if Present
(Formal
) then
8766 Formal_List
:= New_List
;
8768 while Present
(Formal
) loop
8770 (Make_Parameter_Specification
8772 Defining_Identifier
=>
8773 Make_Defining_Identifier
(Sloc
(Formal
),
8774 Chars
=> Chars
(Formal
)),
8775 In_Present
=> In_Present
(Parent
(Formal
)),
8776 Out_Present
=> Out_Present
(Parent
(Formal
)),
8777 Null_Exclusion_Present
=>
8778 Null_Exclusion_Present
(Parent
(Formal
)),
8780 New_Occurrence_Of
(Etype
(Formal
), Loc
),
8782 New_Copy_Tree
(Expression
(Parent
(Formal
)))),
8785 Next_Formal
(Formal
);
8790 Make_Function_Specification
(Loc
,
8791 Defining_Unit_Name
=>
8792 Make_Defining_Identifier
(Loc
,
8793 Chars
=> Chars
(Subp
)),
8794 Parameter_Specifications
=> Formal_List
,
8795 Result_Definition
=>
8796 New_Occurrence_Of
(Etype
(Subp
), Loc
));
8798 Func_Decl
:= Make_Subprogram_Declaration
(Loc
, Func_Spec
);
8799 Append_To
(Decl_List
, Func_Decl
);
8801 -- Build a wrapper body that calls the parent function. The body
8802 -- contains a single return statement that returns an extension
8803 -- aggregate whose ancestor part is a call to the parent function,
8804 -- passing the formals as actuals (with any controlling arguments
8805 -- converted to the types of the corresponding formals of the
8806 -- parent function, which might be anonymous access types), and
8807 -- having a null extension.
8809 Formal
:= First_Formal
(Subp
);
8810 Par_Formal
:= First_Formal
(Alias
(Subp
));
8811 Formal_Node
:= First
(Formal_List
);
8813 if Present
(Formal
) then
8814 Actual_List
:= New_List
;
8816 Actual_List
:= No_List
;
8819 while Present
(Formal
) loop
8820 if Is_Controlling_Formal
(Formal
) then
8821 Append_To
(Actual_List
,
8822 Make_Type_Conversion
(Loc
,
8824 New_Occurrence_Of
(Etype
(Par_Formal
), Loc
),
8827 (Defining_Identifier
(Formal_Node
), Loc
)));
8832 (Defining_Identifier
(Formal_Node
), Loc
));
8835 Next_Formal
(Formal
);
8836 Next_Formal
(Par_Formal
);
8841 Make_Simple_Return_Statement
(Loc
,
8843 Make_Extension_Aggregate
(Loc
,
8845 Make_Function_Call
(Loc
,
8847 New_Occurrence_Of
(Alias
(Subp
), Loc
),
8848 Parameter_Associations
=> Actual_List
),
8849 Null_Record_Present
=> True));
8852 Make_Subprogram_Body
(Loc
,
8853 Specification
=> New_Copy_Tree
(Func_Spec
),
8854 Declarations
=> Empty_List
,
8855 Handled_Statement_Sequence
=>
8856 Make_Handled_Sequence_Of_Statements
(Loc
,
8857 Statements
=> New_List
(Return_Stmt
)));
8859 Set_Defining_Unit_Name
8860 (Specification
(Func_Body
),
8861 Make_Defining_Identifier
(Loc
, Chars
(Subp
)));
8863 Append_To
(Body_List
, Func_Body
);
8865 -- Replace the inherited function with the wrapper function in the
8866 -- primitive operations list. We add the minimum decoration needed
8867 -- to override interface primitives.
8869 Set_Ekind
(Defining_Unit_Name
(Func_Spec
), E_Function
);
8871 Override_Dispatching_Operation
8872 (Tag_Typ
, Subp
, New_Op
=> Defining_Unit_Name
(Func_Spec
),
8873 Is_Wrapper
=> True);
8877 Next_Elmt
(Prim_Elmt
);
8879 end Make_Controlling_Function_Wrappers
;
8885 function Make_Eq_Body
8887 Eq_Name
: Name_Id
) return Node_Id
8889 Loc
: constant Source_Ptr
:= Sloc
(Parent
(Typ
));
8891 Def
: constant Node_Id
:= Parent
(Typ
);
8892 Stmts
: constant List_Id
:= New_List
;
8893 Variant_Case
: Boolean := Has_Discriminants
(Typ
);
8894 Comps
: Node_Id
:= Empty
;
8895 Typ_Def
: Node_Id
:= Type_Definition
(Def
);
8899 Predef_Spec_Or_Body
(Loc
,
8902 Profile
=> New_List
(
8903 Make_Parameter_Specification
(Loc
,
8904 Defining_Identifier
=>
8905 Make_Defining_Identifier
(Loc
, Name_X
),
8906 Parameter_Type
=> New_Occurrence_Of
(Typ
, Loc
)),
8908 Make_Parameter_Specification
(Loc
,
8909 Defining_Identifier
=>
8910 Make_Defining_Identifier
(Loc
, Name_Y
),
8911 Parameter_Type
=> New_Occurrence_Of
(Typ
, Loc
))),
8913 Ret_Type
=> Standard_Boolean
,
8916 if Variant_Case
then
8917 if Nkind
(Typ_Def
) = N_Derived_Type_Definition
then
8918 Typ_Def
:= Record_Extension_Part
(Typ_Def
);
8921 if Present
(Typ_Def
) then
8922 Comps
:= Component_List
(Typ_Def
);
8926 Present
(Comps
) and then Present
(Variant_Part
(Comps
));
8929 if Variant_Case
then
8931 Make_Eq_If
(Typ
, Discriminant_Specifications
(Def
)));
8932 Append_List_To
(Stmts
, Make_Eq_Case
(Typ
, Comps
));
8934 Make_Simple_Return_Statement
(Loc
,
8935 Expression
=> New_Occurrence_Of
(Standard_True
, Loc
)));
8939 Make_Simple_Return_Statement
(Loc
,
8941 Expand_Record_Equality
8944 Lhs
=> Make_Identifier
(Loc
, Name_X
),
8945 Rhs
=> Make_Identifier
(Loc
, Name_Y
),
8946 Bodies
=> Declarations
(Decl
))));
8949 Set_Handled_Statement_Sequence
8950 (Decl
, Make_Handled_Sequence_Of_Statements
(Loc
, Stmts
));
8958 -- <Make_Eq_If shared components>
8961 -- when V1 => <Make_Eq_Case> on subcomponents
8963 -- when Vn => <Make_Eq_Case> on subcomponents
8966 function Make_Eq_Case
8969 Discrs
: Elist_Id
:= New_Elmt_List
) return List_Id
8971 Loc
: constant Source_Ptr
:= Sloc
(E
);
8972 Result
: constant List_Id
:= New_List
;
8976 function Corresponding_Formal
(C
: Node_Id
) return Entity_Id
;
8977 -- Given the discriminant that controls a given variant of an unchecked
8978 -- union, find the formal of the equality function that carries the
8979 -- inferred value of the discriminant.
8981 function External_Name
(E
: Entity_Id
) return Name_Id
;
8982 -- The value of a given discriminant is conveyed in the corresponding
8983 -- formal parameter of the equality routine. The name of this formal
8984 -- parameter carries a one-character suffix which is removed here.
8986 --------------------------
8987 -- Corresponding_Formal --
8988 --------------------------
8990 function Corresponding_Formal
(C
: Node_Id
) return Entity_Id
is
8991 Discr
: constant Entity_Id
:= Entity
(Name
(Variant_Part
(C
)));
8995 Elm
:= First_Elmt
(Discrs
);
8996 while Present
(Elm
) loop
8997 if Chars
(Discr
) = External_Name
(Node
(Elm
)) then
9004 -- A formal of the proper name must be found
9006 raise Program_Error
;
9007 end Corresponding_Formal
;
9013 function External_Name
(E
: Entity_Id
) return Name_Id
is
9015 Get_Name_String
(Chars
(E
));
9016 Name_Len
:= Name_Len
- 1;
9020 -- Start of processing for Make_Eq_Case
9023 Append_To
(Result
, Make_Eq_If
(E
, Component_Items
(CL
)));
9025 if No
(Variant_Part
(CL
)) then
9029 Variant
:= First_Non_Pragma
(Variants
(Variant_Part
(CL
)));
9031 if No
(Variant
) then
9035 Alt_List
:= New_List
;
9036 while Present
(Variant
) loop
9037 Append_To
(Alt_List
,
9038 Make_Case_Statement_Alternative
(Loc
,
9039 Discrete_Choices
=> New_Copy_List
(Discrete_Choices
(Variant
)),
9041 Make_Eq_Case
(E
, Component_List
(Variant
), Discrs
)));
9042 Next_Non_Pragma
(Variant
);
9045 -- If we have an Unchecked_Union, use one of the parameters of the
9046 -- enclosing equality routine that captures the discriminant, to use
9047 -- as the expression in the generated case statement.
9049 if Is_Unchecked_Union
(E
) then
9051 Make_Case_Statement
(Loc
,
9053 New_Occurrence_Of
(Corresponding_Formal
(CL
), Loc
),
9054 Alternatives
=> Alt_List
));
9058 Make_Case_Statement
(Loc
,
9060 Make_Selected_Component
(Loc
,
9061 Prefix
=> Make_Identifier
(Loc
, Name_X
),
9062 Selector_Name
=> New_Copy
(Name
(Variant_Part
(CL
)))),
9063 Alternatives
=> Alt_List
));
9084 -- or a null statement if the list L is empty
9088 L
: List_Id
) return Node_Id
9090 Loc
: constant Source_Ptr
:= Sloc
(E
);
9092 Field_Name
: Name_Id
;
9097 return Make_Null_Statement
(Loc
);
9102 C
:= First_Non_Pragma
(L
);
9103 while Present
(C
) loop
9104 Field_Name
:= Chars
(Defining_Identifier
(C
));
9106 -- The tags must not be compared: they are not part of the value.
9107 -- Ditto for parent interfaces because their equality operator is
9110 -- Note also that in the following, we use Make_Identifier for
9111 -- the component names. Use of New_Occurrence_Of to identify the
9112 -- components would be incorrect because the wrong entities for
9113 -- discriminants could be picked up in the private type case.
9115 if Field_Name
= Name_uParent
9116 and then Is_Interface
(Etype
(Defining_Identifier
(C
)))
9120 elsif Field_Name
/= Name_uTag
then
9121 Evolve_Or_Else
(Cond
,
9124 Make_Selected_Component
(Loc
,
9125 Prefix
=> Make_Identifier
(Loc
, Name_X
),
9126 Selector_Name
=> Make_Identifier
(Loc
, Field_Name
)),
9129 Make_Selected_Component
(Loc
,
9130 Prefix
=> Make_Identifier
(Loc
, Name_Y
),
9131 Selector_Name
=> Make_Identifier
(Loc
, Field_Name
))));
9134 Next_Non_Pragma
(C
);
9138 return Make_Null_Statement
(Loc
);
9142 Make_Implicit_If_Statement
(E
,
9144 Then_Statements
=> New_List
(
9145 Make_Simple_Return_Statement
(Loc
,
9146 Expression
=> New_Occurrence_Of
(Standard_False
, Loc
))));
9155 function Make_Neq_Body
(Tag_Typ
: Entity_Id
) return Node_Id
is
9157 function Is_Predefined_Neq_Renaming
(Prim
: Node_Id
) return Boolean;
9158 -- Returns true if Prim is a renaming of an unresolved predefined
9159 -- inequality operation.
9161 --------------------------------
9162 -- Is_Predefined_Neq_Renaming --
9163 --------------------------------
9165 function Is_Predefined_Neq_Renaming
(Prim
: Node_Id
) return Boolean is
9167 return Chars
(Prim
) /= Name_Op_Ne
9168 and then Present
(Alias
(Prim
))
9169 and then Comes_From_Source
(Prim
)
9170 and then Is_Intrinsic_Subprogram
(Alias
(Prim
))
9171 and then Chars
(Alias
(Prim
)) = Name_Op_Ne
;
9172 end Is_Predefined_Neq_Renaming
;
9176 Loc
: constant Source_Ptr
:= Sloc
(Parent
(Tag_Typ
));
9177 Stmts
: constant List_Id
:= New_List
;
9179 Eq_Prim
: Entity_Id
;
9180 Left_Op
: Entity_Id
;
9181 Renaming_Prim
: Entity_Id
;
9182 Right_Op
: Entity_Id
;
9185 -- Start of processing for Make_Neq_Body
9188 -- For a call on a renaming of a dispatching subprogram that is
9189 -- overridden, if the overriding occurred before the renaming, then
9190 -- the body executed is that of the overriding declaration, even if the
9191 -- overriding declaration is not visible at the place of the renaming;
9192 -- otherwise, the inherited or predefined subprogram is called, see
9195 -- Stage 1: Search for a renaming of the inequality primitive and also
9196 -- search for an overriding of the equality primitive located before the
9197 -- renaming declaration.
9205 Renaming_Prim
:= Empty
;
9207 Elmt
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
9208 while Present
(Elmt
) loop
9209 Prim
:= Node
(Elmt
);
9211 if Is_User_Defined_Equality
(Prim
) and then No
(Alias
(Prim
)) then
9212 if No
(Renaming_Prim
) then
9213 pragma Assert
(No
(Eq_Prim
));
9217 elsif Is_Predefined_Neq_Renaming
(Prim
) then
9218 Renaming_Prim
:= Prim
;
9225 -- No further action needed if no renaming was found
9227 if No
(Renaming_Prim
) then
9231 -- Stage 2: Replace the renaming declaration by a subprogram declaration
9232 -- (required to add its body)
9234 Decl
:= Parent
(Parent
(Renaming_Prim
));
9236 Make_Subprogram_Declaration
(Loc
,
9237 Specification
=> Specification
(Decl
)));
9238 Set_Analyzed
(Decl
);
9240 -- Remove the decoration of intrinsic renaming subprogram
9242 Set_Is_Intrinsic_Subprogram
(Renaming_Prim
, False);
9243 Set_Convention
(Renaming_Prim
, Convention_Ada
);
9244 Set_Alias
(Renaming_Prim
, Empty
);
9245 Set_Has_Completion
(Renaming_Prim
, False);
9247 -- Stage 3: Build the corresponding body
9249 Left_Op
:= First_Formal
(Renaming_Prim
);
9250 Right_Op
:= Next_Formal
(Left_Op
);
9253 Predef_Spec_Or_Body
(Loc
,
9255 Name
=> Chars
(Renaming_Prim
),
9256 Profile
=> New_List
(
9257 Make_Parameter_Specification
(Loc
,
9258 Defining_Identifier
=>
9259 Make_Defining_Identifier
(Loc
, Chars
(Left_Op
)),
9260 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
)),
9262 Make_Parameter_Specification
(Loc
,
9263 Defining_Identifier
=>
9264 Make_Defining_Identifier
(Loc
, Chars
(Right_Op
)),
9265 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
))),
9267 Ret_Type
=> Standard_Boolean
,
9270 -- If the overriding of the equality primitive occurred before the
9271 -- renaming, then generate:
9273 -- function <Neq_Name> (X : Y : Typ) return Boolean is
9275 -- return not Oeq (X, Y);
9278 if Present
(Eq_Prim
) then
9281 -- Otherwise build a nested subprogram which performs the predefined
9282 -- evaluation of the equality operator. That is, generate:
9284 -- function <Neq_Name> (X : Y : Typ) return Boolean is
9285 -- function Oeq (X : Y) return Boolean is
9287 -- <<body of default implementation>>
9290 -- return not Oeq (X, Y);
9295 Local_Subp
: Node_Id
;
9297 Local_Subp
:= Make_Eq_Body
(Tag_Typ
, Name_Op_Eq
);
9298 Set_Declarations
(Decl
, New_List
(Local_Subp
));
9299 Target
:= Defining_Entity
(Local_Subp
);
9304 Make_Simple_Return_Statement
(Loc
,
9307 Make_Function_Call
(Loc
,
9308 Name
=> New_Occurrence_Of
(Target
, Loc
),
9309 Parameter_Associations
=> New_List
(
9310 Make_Identifier
(Loc
, Chars
(Left_Op
)),
9311 Make_Identifier
(Loc
, Chars
(Right_Op
)))))));
9313 Set_Handled_Statement_Sequence
9314 (Decl
, Make_Handled_Sequence_Of_Statements
(Loc
, Stmts
));
9318 -------------------------------
9319 -- Make_Null_Procedure_Specs --
9320 -------------------------------
9322 function Make_Null_Procedure_Specs
(Tag_Typ
: Entity_Id
) return List_Id
is
9323 Decl_List
: constant List_Id
:= New_List
;
9324 Loc
: constant Source_Ptr
:= Sloc
(Tag_Typ
);
9326 Formal_List
: List_Id
;
9327 New_Param_Spec
: Node_Id
;
9328 Parent_Subp
: Entity_Id
;
9329 Prim_Elmt
: Elmt_Id
;
9333 Prim_Elmt
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
9334 while Present
(Prim_Elmt
) loop
9335 Subp
:= Node
(Prim_Elmt
);
9337 -- If a null procedure inherited from an interface has not been
9338 -- overridden, then we build a null procedure declaration to
9339 -- override the inherited procedure.
9341 Parent_Subp
:= Alias
(Subp
);
9343 if Present
(Parent_Subp
)
9344 and then Is_Null_Interface_Primitive
(Parent_Subp
)
9346 Formal_List
:= No_List
;
9347 Formal
:= First_Formal
(Subp
);
9349 if Present
(Formal
) then
9350 Formal_List
:= New_List
;
9352 while Present
(Formal
) loop
9354 -- Copy the parameter spec including default expressions
9357 New_Copy_Tree
(Parent
(Formal
), New_Sloc
=> Loc
);
9359 -- Generate a new defining identifier for the new formal.
9360 -- required because New_Copy_Tree does not duplicate
9361 -- semantic fields (except itypes).
9363 Set_Defining_Identifier
(New_Param_Spec
,
9364 Make_Defining_Identifier
(Sloc
(Formal
),
9365 Chars
=> Chars
(Formal
)));
9367 -- For controlling arguments we must change their
9368 -- parameter type to reference the tagged type (instead
9369 -- of the interface type)
9371 if Is_Controlling_Formal
(Formal
) then
9372 if Nkind
(Parameter_Type
(Parent
(Formal
))) = N_Identifier
9374 Set_Parameter_Type
(New_Param_Spec
,
9375 New_Occurrence_Of
(Tag_Typ
, Loc
));
9378 (Nkind
(Parameter_Type
(Parent
(Formal
))) =
9379 N_Access_Definition
);
9380 Set_Subtype_Mark
(Parameter_Type
(New_Param_Spec
),
9381 New_Occurrence_Of
(Tag_Typ
, Loc
));
9385 Append
(New_Param_Spec
, Formal_List
);
9387 Next_Formal
(Formal
);
9391 Append_To
(Decl_List
,
9392 Make_Subprogram_Declaration
(Loc
,
9393 Make_Procedure_Specification
(Loc
,
9394 Defining_Unit_Name
=>
9395 Make_Defining_Identifier
(Loc
, Chars
(Subp
)),
9396 Parameter_Specifications
=> Formal_List
,
9397 Null_Present
=> True)));
9400 Next_Elmt
(Prim_Elmt
);
9404 end Make_Null_Procedure_Specs
;
9406 -------------------------------------
9407 -- Make_Predefined_Primitive_Specs --
9408 -------------------------------------
9410 procedure Make_Predefined_Primitive_Specs
9411 (Tag_Typ
: Entity_Id
;
9412 Predef_List
: out List_Id
;
9413 Renamed_Eq
: out Entity_Id
)
9415 function Is_Predefined_Eq_Renaming
(Prim
: Node_Id
) return Boolean;
9416 -- Returns true if Prim is a renaming of an unresolved predefined
9417 -- equality operation.
9419 -------------------------------
9420 -- Is_Predefined_Eq_Renaming --
9421 -------------------------------
9423 function Is_Predefined_Eq_Renaming
(Prim
: Node_Id
) return Boolean is
9425 return Chars
(Prim
) /= Name_Op_Eq
9426 and then Present
(Alias
(Prim
))
9427 and then Comes_From_Source
(Prim
)
9428 and then Is_Intrinsic_Subprogram
(Alias
(Prim
))
9429 and then Chars
(Alias
(Prim
)) = Name_Op_Eq
;
9430 end Is_Predefined_Eq_Renaming
;
9434 Loc
: constant Source_Ptr
:= Sloc
(Tag_Typ
);
9435 Res
: constant List_Id
:= New_List
;
9436 Eq_Name
: Name_Id
:= Name_Op_Eq
;
9437 Eq_Needed
: Boolean;
9441 Has_Predef_Eq_Renaming
: Boolean := False;
9442 -- Set to True if Tag_Typ has a primitive that renames the predefined
9443 -- equality operator. Used to implement (RM 8-5-4(8)).
9445 -- Start of processing for Make_Predefined_Primitive_Specs
9448 Renamed_Eq
:= Empty
;
9452 Append_To
(Res
, Predef_Spec_Or_Body
(Loc
,
9455 Profile
=> New_List
(
9456 Make_Parameter_Specification
(Loc
,
9457 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_X
),
9458 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
))),
9460 Ret_Type
=> Standard_Long_Long_Integer
));
9462 -- Specs for dispatching stream attributes
9465 Stream_Op_TSS_Names
:
9466 constant array (Integer range <>) of TSS_Name_Type
:=
9473 for Op
in Stream_Op_TSS_Names
'Range loop
9474 if Stream_Operation_OK
(Tag_Typ
, Stream_Op_TSS_Names
(Op
)) then
9476 Predef_Stream_Attr_Spec
(Loc
, Tag_Typ
,
9477 Stream_Op_TSS_Names
(Op
)));
9482 -- Spec of "=" is expanded if the type is not limited and if a user
9483 -- defined "=" was not already declared for the non-full view of a
9484 -- private extension
9486 if not Is_Limited_Type
(Tag_Typ
) then
9488 Prim
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
9489 while Present
(Prim
) loop
9491 -- If a primitive is encountered that renames the predefined
9492 -- equality operator before reaching any explicit equality
9493 -- primitive, then we still need to create a predefined equality
9494 -- function, because calls to it can occur via the renaming. A
9495 -- new name is created for the equality to avoid conflicting with
9496 -- any user-defined equality. (Note that this doesn't account for
9497 -- renamings of equality nested within subpackages???)
9499 if Is_Predefined_Eq_Renaming
(Node
(Prim
)) then
9500 Has_Predef_Eq_Renaming
:= True;
9501 Eq_Name
:= New_External_Name
(Chars
(Node
(Prim
)), 'E');
9503 -- User-defined equality
9505 elsif Is_User_Defined_Equality
(Node
(Prim
)) then
9506 if No
(Alias
(Node
(Prim
)))
9507 or else Nkind
(Unit_Declaration_Node
(Node
(Prim
))) =
9508 N_Subprogram_Renaming_Declaration
9513 -- If the parent is not an interface type and has an abstract
9514 -- equality function explicitly defined in the sources, then
9515 -- the inherited equality is abstract as well, and no body can
9516 -- be created for it.
9518 elsif not Is_Interface
(Etype
(Tag_Typ
))
9519 and then Present
(Alias
(Node
(Prim
)))
9520 and then Comes_From_Source
(Alias
(Node
(Prim
)))
9521 and then Is_Abstract_Subprogram
(Alias
(Node
(Prim
)))
9526 -- If the type has an equality function corresponding with
9527 -- a primitive defined in an interface type, the inherited
9528 -- equality is abstract as well, and no body can be created
9531 elsif Present
(Alias
(Node
(Prim
)))
9532 and then Comes_From_Source
(Ultimate_Alias
(Node
(Prim
)))
9535 (Find_Dispatching_Type
(Ultimate_Alias
(Node
(Prim
))))
9545 -- If a renaming of predefined equality was found but there was no
9546 -- user-defined equality (so Eq_Needed is still true), then set the
9547 -- name back to Name_Op_Eq. But in the case where a user-defined
9548 -- equality was located after such a renaming, then the predefined
9549 -- equality function is still needed, so Eq_Needed must be set back
9552 if Eq_Name
/= Name_Op_Eq
then
9554 Eq_Name
:= Name_Op_Eq
;
9561 Eq_Spec
:= Predef_Spec_Or_Body
(Loc
,
9564 Profile
=> New_List
(
9565 Make_Parameter_Specification
(Loc
,
9566 Defining_Identifier
=>
9567 Make_Defining_Identifier
(Loc
, Name_X
),
9568 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
)),
9570 Make_Parameter_Specification
(Loc
,
9571 Defining_Identifier
=>
9572 Make_Defining_Identifier
(Loc
, Name_Y
),
9573 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
))),
9574 Ret_Type
=> Standard_Boolean
);
9575 Append_To
(Res
, Eq_Spec
);
9577 if Has_Predef_Eq_Renaming
then
9578 Renamed_Eq
:= Defining_Unit_Name
(Specification
(Eq_Spec
));
9580 Prim
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
9581 while Present
(Prim
) loop
9583 -- Any renamings of equality that appeared before an
9584 -- overriding equality must be updated to refer to the
9585 -- entity for the predefined equality, otherwise calls via
9586 -- the renaming would get incorrectly resolved to call the
9587 -- user-defined equality function.
9589 if Is_Predefined_Eq_Renaming
(Node
(Prim
)) then
9590 Set_Alias
(Node
(Prim
), Renamed_Eq
);
9592 -- Exit upon encountering a user-defined equality
9594 elsif Chars
(Node
(Prim
)) = Name_Op_Eq
9595 and then No
(Alias
(Node
(Prim
)))
9605 -- Spec for dispatching assignment
9607 Append_To
(Res
, Predef_Spec_Or_Body
(Loc
,
9609 Name
=> Name_uAssign
,
9610 Profile
=> New_List
(
9611 Make_Parameter_Specification
(Loc
,
9612 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_X
),
9613 Out_Present
=> True,
9614 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
)),
9616 Make_Parameter_Specification
(Loc
,
9617 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_Y
),
9618 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
)))));
9621 -- Ada 2005: Generate declarations for the following primitive
9622 -- operations for limited interfaces and synchronized types that
9623 -- implement a limited interface.
9625 -- Disp_Asynchronous_Select
9626 -- Disp_Conditional_Select
9627 -- Disp_Get_Prim_Op_Kind
9630 -- Disp_Timed_Select
9632 -- Disable the generation of these bodies if No_Dispatching_Calls,
9633 -- Ravenscar or ZFP is active.
9635 if Ada_Version
>= Ada_2005
9636 and then not Restriction_Active
(No_Dispatching_Calls
)
9637 and then not Restriction_Active
(No_Select_Statements
)
9638 and then RTE_Available
(RE_Select_Specific_Data
)
9640 -- These primitives are defined abstract in interface types
9642 if Is_Interface
(Tag_Typ
)
9643 and then Is_Limited_Record
(Tag_Typ
)
9646 Make_Abstract_Subprogram_Declaration
(Loc
,
9648 Make_Disp_Asynchronous_Select_Spec
(Tag_Typ
)));
9651 Make_Abstract_Subprogram_Declaration
(Loc
,
9653 Make_Disp_Conditional_Select_Spec
(Tag_Typ
)));
9656 Make_Abstract_Subprogram_Declaration
(Loc
,
9658 Make_Disp_Get_Prim_Op_Kind_Spec
(Tag_Typ
)));
9661 Make_Abstract_Subprogram_Declaration
(Loc
,
9663 Make_Disp_Get_Task_Id_Spec
(Tag_Typ
)));
9666 Make_Abstract_Subprogram_Declaration
(Loc
,
9668 Make_Disp_Requeue_Spec
(Tag_Typ
)));
9671 Make_Abstract_Subprogram_Declaration
(Loc
,
9673 Make_Disp_Timed_Select_Spec
(Tag_Typ
)));
9675 -- If ancestor is an interface type, declare non-abstract primitives
9676 -- to override the abstract primitives of the interface type.
9678 -- In VM targets we define these primitives in all root tagged types
9679 -- that are not interface types. Done because in VM targets we don't
9680 -- have secondary dispatch tables and any derivation of Tag_Typ may
9681 -- cover limited interfaces (which always have these primitives since
9682 -- they may be ancestors of synchronized interface types).
9684 elsif (not Is_Interface
(Tag_Typ
)
9685 and then Is_Interface
(Etype
(Tag_Typ
))
9686 and then Is_Limited_Record
(Etype
(Tag_Typ
)))
9688 (Is_Concurrent_Record_Type
(Tag_Typ
)
9689 and then Has_Interfaces
(Tag_Typ
))
9691 (not Tagged_Type_Expansion
9692 and then not Is_Interface
(Tag_Typ
)
9693 and then Tag_Typ
= Root_Type
(Tag_Typ
))
9696 Make_Subprogram_Declaration
(Loc
,
9698 Make_Disp_Asynchronous_Select_Spec
(Tag_Typ
)));
9701 Make_Subprogram_Declaration
(Loc
,
9703 Make_Disp_Conditional_Select_Spec
(Tag_Typ
)));
9706 Make_Subprogram_Declaration
(Loc
,
9708 Make_Disp_Get_Prim_Op_Kind_Spec
(Tag_Typ
)));
9711 Make_Subprogram_Declaration
(Loc
,
9713 Make_Disp_Get_Task_Id_Spec
(Tag_Typ
)));
9716 Make_Subprogram_Declaration
(Loc
,
9718 Make_Disp_Requeue_Spec
(Tag_Typ
)));
9721 Make_Subprogram_Declaration
(Loc
,
9723 Make_Disp_Timed_Select_Spec
(Tag_Typ
)));
9727 -- All tagged types receive their own Deep_Adjust and Deep_Finalize
9728 -- regardless of whether they are controlled or may contain controlled
9731 -- Do not generate the routines if finalization is disabled
9733 if Restriction_Active
(No_Finalization
) then
9737 if not Is_Limited_Type
(Tag_Typ
) then
9738 Append_To
(Res
, Predef_Deep_Spec
(Loc
, Tag_Typ
, TSS_Deep_Adjust
));
9741 Append_To
(Res
, Predef_Deep_Spec
(Loc
, Tag_Typ
, TSS_Deep_Finalize
));
9745 end Make_Predefined_Primitive_Specs
;
9747 -------------------------
9748 -- Make_Tag_Assignment --
9749 -------------------------
9751 function Make_Tag_Assignment
(N
: Node_Id
) return Node_Id
is
9752 Loc
: constant Source_Ptr
:= Sloc
(N
);
9753 Def_If
: constant Entity_Id
:= Defining_Identifier
(N
);
9754 Expr
: constant Node_Id
:= Expression
(N
);
9755 Typ
: constant Entity_Id
:= Etype
(Def_If
);
9756 Full_Typ
: constant Entity_Id
:= Underlying_Type
(Typ
);
9760 -- This expansion activity is called during analysis, but cannot
9761 -- be applied in ASIS mode when other expansion is disabled.
9763 if Is_Tagged_Type
(Typ
)
9764 and then not Is_Class_Wide_Type
(Typ
)
9765 and then not Is_CPP_Class
(Typ
)
9766 and then Tagged_Type_Expansion
9767 and then Nkind
(Expr
) /= N_Aggregate
9768 and then not ASIS_Mode
9769 and then (Nkind
(Expr
) /= N_Qualified_Expression
9770 or else Nkind
(Expression
(Expr
)) /= N_Aggregate
)
9773 Make_Selected_Component
(Loc
,
9774 Prefix
=> New_Occurrence_Of
(Def_If
, Loc
),
9776 New_Occurrence_Of
(First_Tag_Component
(Full_Typ
), Loc
));
9777 Set_Assignment_OK
(New_Ref
);
9780 Make_Assignment_Statement
(Loc
,
9783 Unchecked_Convert_To
(RTE
(RE_Tag
),
9784 New_Occurrence_Of
(Node
9785 (First_Elmt
(Access_Disp_Table
(Full_Typ
))), Loc
)));
9789 end Make_Tag_Assignment
;
9791 ---------------------------------
9792 -- Needs_Simple_Initialization --
9793 ---------------------------------
9795 function Needs_Simple_Initialization
9797 Consider_IS
: Boolean := True) return Boolean
9799 Consider_IS_NS
: constant Boolean :=
9800 Normalize_Scalars
or (Initialize_Scalars
and Consider_IS
);
9803 -- Never need initialization if it is suppressed
9805 if Initialization_Suppressed
(T
) then
9809 -- Check for private type, in which case test applies to the underlying
9810 -- type of the private type.
9812 if Is_Private_Type
(T
) then
9814 RT
: constant Entity_Id
:= Underlying_Type
(T
);
9816 if Present
(RT
) then
9817 return Needs_Simple_Initialization
(RT
);
9823 -- Scalar type with Default_Value aspect requires initialization
9825 elsif Is_Scalar_Type
(T
) and then Has_Default_Aspect
(T
) then
9828 -- Cases needing simple initialization are access types, and, if pragma
9829 -- Normalize_Scalars or Initialize_Scalars is in effect, then all scalar
9832 elsif Is_Access_Type
(T
)
9833 or else (Consider_IS_NS
and then (Is_Scalar_Type
(T
)))
9837 -- If Initialize/Normalize_Scalars is in effect, string objects also
9838 -- need initialization, unless they are created in the course of
9839 -- expanding an aggregate (since in the latter case they will be
9840 -- filled with appropriate initializing values before they are used).
9842 elsif Consider_IS_NS
9843 and then Is_Standard_String_Type
(T
)
9846 or else Nkind
(Associated_Node_For_Itype
(T
)) /= N_Aggregate
)
9853 end Needs_Simple_Initialization
;
9855 ----------------------
9856 -- Predef_Deep_Spec --
9857 ----------------------
9859 function Predef_Deep_Spec
9861 Tag_Typ
: Entity_Id
;
9862 Name
: TSS_Name_Type
;
9863 For_Body
: Boolean := False) return Node_Id
9868 -- V : in out Tag_Typ
9870 Formals
:= New_List
(
9871 Make_Parameter_Specification
(Loc
,
9872 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_V
),
9874 Out_Present
=> True,
9875 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
)));
9877 -- F : Boolean := True
9879 if Name
= TSS_Deep_Adjust
9880 or else Name
= TSS_Deep_Finalize
9883 Make_Parameter_Specification
(Loc
,
9884 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_F
),
9885 Parameter_Type
=> New_Occurrence_Of
(Standard_Boolean
, Loc
),
9886 Expression
=> New_Occurrence_Of
(Standard_True
, Loc
)));
9890 Predef_Spec_Or_Body
(Loc
,
9891 Name
=> Make_TSS_Name
(Tag_Typ
, Name
),
9894 For_Body
=> For_Body
);
9897 when RE_Not_Available
=>
9899 end Predef_Deep_Spec
;
9901 -------------------------
9902 -- Predef_Spec_Or_Body --
9903 -------------------------
9905 function Predef_Spec_Or_Body
9907 Tag_Typ
: Entity_Id
;
9910 Ret_Type
: Entity_Id
:= Empty
;
9911 For_Body
: Boolean := False) return Node_Id
9913 Id
: constant Entity_Id
:= Make_Defining_Identifier
(Loc
, Name
);
9917 Set_Is_Public
(Id
, Is_Public
(Tag_Typ
));
9919 -- The internal flag is set to mark these declarations because they have
9920 -- specific properties. First, they are primitives even if they are not
9921 -- defined in the type scope (the freezing point is not necessarily in
9922 -- the same scope). Second, the predefined equality can be overridden by
9923 -- a user-defined equality, no body will be generated in this case.
9925 Set_Is_Internal
(Id
);
9927 if not Debug_Generated_Code
then
9928 Set_Debug_Info_Off
(Id
);
9931 if No
(Ret_Type
) then
9933 Make_Procedure_Specification
(Loc
,
9934 Defining_Unit_Name
=> Id
,
9935 Parameter_Specifications
=> Profile
);
9938 Make_Function_Specification
(Loc
,
9939 Defining_Unit_Name
=> Id
,
9940 Parameter_Specifications
=> Profile
,
9941 Result_Definition
=> New_Occurrence_Of
(Ret_Type
, Loc
));
9944 if Is_Interface
(Tag_Typ
) then
9945 return Make_Abstract_Subprogram_Declaration
(Loc
, Spec
);
9947 -- If body case, return empty subprogram body. Note that this is ill-
9948 -- formed, because there is not even a null statement, and certainly not
9949 -- a return in the function case. The caller is expected to do surgery
9950 -- on the body to add the appropriate stuff.
9953 return Make_Subprogram_Body
(Loc
, Spec
, Empty_List
, Empty
);
9955 -- For the case of an Input attribute predefined for an abstract type,
9956 -- generate an abstract specification. This will never be called, but we
9957 -- need the slot allocated in the dispatching table so that attributes
9958 -- typ'Class'Input and typ'Class'Output will work properly.
9960 elsif Is_TSS
(Name
, TSS_Stream_Input
)
9961 and then Is_Abstract_Type
(Tag_Typ
)
9963 return Make_Abstract_Subprogram_Declaration
(Loc
, Spec
);
9965 -- Normal spec case, where we return a subprogram declaration
9968 return Make_Subprogram_Declaration
(Loc
, Spec
);
9970 end Predef_Spec_Or_Body
;
9972 -----------------------------
9973 -- Predef_Stream_Attr_Spec --
9974 -----------------------------
9976 function Predef_Stream_Attr_Spec
9978 Tag_Typ
: Entity_Id
;
9979 Name
: TSS_Name_Type
;
9980 For_Body
: Boolean := False) return Node_Id
9982 Ret_Type
: Entity_Id
;
9985 if Name
= TSS_Stream_Input
then
9986 Ret_Type
:= Tag_Typ
;
9994 Name
=> Make_TSS_Name
(Tag_Typ
, Name
),
9996 Profile
=> Build_Stream_Attr_Profile
(Loc
, Tag_Typ
, Name
),
9997 Ret_Type
=> Ret_Type
,
9998 For_Body
=> For_Body
);
9999 end Predef_Stream_Attr_Spec
;
10001 ---------------------------------
10002 -- Predefined_Primitive_Bodies --
10003 ---------------------------------
10005 function Predefined_Primitive_Bodies
10006 (Tag_Typ
: Entity_Id
;
10007 Renamed_Eq
: Entity_Id
) return List_Id
10009 Loc
: constant Source_Ptr
:= Sloc
(Tag_Typ
);
10010 Res
: constant List_Id
:= New_List
;
10013 Eq_Needed
: Boolean;
10017 pragma Warnings
(Off
, Ent
);
10020 pragma Assert
(not Is_Interface
(Tag_Typ
));
10022 -- See if we have a predefined "=" operator
10024 if Present
(Renamed_Eq
) then
10026 Eq_Name
:= Chars
(Renamed_Eq
);
10028 -- If the parent is an interface type then it has defined all the
10029 -- predefined primitives abstract and we need to check if the type
10030 -- has some user defined "=" function which matches the profile of
10031 -- the Ada predefined equality operator to avoid generating it.
10033 elsif Is_Interface
(Etype
(Tag_Typ
)) then
10035 Eq_Name
:= Name_Op_Eq
;
10037 Prim
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
10038 while Present
(Prim
) loop
10039 if Chars
(Node
(Prim
)) = Name_Op_Eq
10040 and then not Is_Internal
(Node
(Prim
))
10041 and then Present
(First_Entity
(Node
(Prim
)))
10043 -- The predefined equality primitive must have exactly two
10044 -- formals whose type is this tagged type
10046 and then Present
(Last_Entity
(Node
(Prim
)))
10047 and then Next_Entity
(First_Entity
(Node
(Prim
)))
10048 = Last_Entity
(Node
(Prim
))
10049 and then Etype
(First_Entity
(Node
(Prim
))) = Tag_Typ
10050 and then Etype
(Last_Entity
(Node
(Prim
))) = Tag_Typ
10052 Eq_Needed
:= False;
10053 Eq_Name
:= No_Name
;
10061 Eq_Needed
:= False;
10062 Eq_Name
:= No_Name
;
10064 Prim
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
10065 while Present
(Prim
) loop
10066 if Chars
(Node
(Prim
)) = Name_Op_Eq
10067 and then Is_Internal
(Node
(Prim
))
10070 Eq_Name
:= Name_Op_Eq
;
10080 Decl
:= Predef_Spec_Or_Body
(Loc
,
10081 Tag_Typ
=> Tag_Typ
,
10082 Name
=> Name_uSize
,
10083 Profile
=> New_List
(
10084 Make_Parameter_Specification
(Loc
,
10085 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_X
),
10086 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
))),
10088 Ret_Type
=> Standard_Long_Long_Integer
,
10091 Set_Handled_Statement_Sequence
(Decl
,
10092 Make_Handled_Sequence_Of_Statements
(Loc
, New_List
(
10093 Make_Simple_Return_Statement
(Loc
,
10095 Make_Attribute_Reference
(Loc
,
10096 Prefix
=> Make_Identifier
(Loc
, Name_X
),
10097 Attribute_Name
=> Name_Size
)))));
10099 Append_To
(Res
, Decl
);
10101 -- Bodies for Dispatching stream IO routines. We need these only for
10102 -- non-limited types (in the limited case there is no dispatching).
10103 -- We also skip them if dispatching or finalization are not available
10104 -- or if stream operations are prohibited by restriction No_Streams or
10105 -- from use of pragma/aspect No_Tagged_Streams.
10107 if Stream_Operation_OK
(Tag_Typ
, TSS_Stream_Read
)
10108 and then No
(TSS
(Tag_Typ
, TSS_Stream_Read
))
10110 Build_Record_Read_Procedure
(Loc
, Tag_Typ
, Decl
, Ent
);
10111 Append_To
(Res
, Decl
);
10114 if Stream_Operation_OK
(Tag_Typ
, TSS_Stream_Write
)
10115 and then No
(TSS
(Tag_Typ
, TSS_Stream_Write
))
10117 Build_Record_Write_Procedure
(Loc
, Tag_Typ
, Decl
, Ent
);
10118 Append_To
(Res
, Decl
);
10121 -- Skip body of _Input for the abstract case, since the corresponding
10122 -- spec is abstract (see Predef_Spec_Or_Body).
10124 if not Is_Abstract_Type
(Tag_Typ
)
10125 and then Stream_Operation_OK
(Tag_Typ
, TSS_Stream_Input
)
10126 and then No
(TSS
(Tag_Typ
, TSS_Stream_Input
))
10128 Build_Record_Or_Elementary_Input_Function
10129 (Loc
, Tag_Typ
, Decl
, Ent
);
10130 Append_To
(Res
, Decl
);
10133 if Stream_Operation_OK
(Tag_Typ
, TSS_Stream_Output
)
10134 and then No
(TSS
(Tag_Typ
, TSS_Stream_Output
))
10136 Build_Record_Or_Elementary_Output_Procedure
(Loc
, Tag_Typ
, Decl
, Ent
);
10137 Append_To
(Res
, Decl
);
10140 -- Ada 2005: Generate bodies for the following primitive operations for
10141 -- limited interfaces and synchronized types that implement a limited
10144 -- disp_asynchronous_select
10145 -- disp_conditional_select
10146 -- disp_get_prim_op_kind
10147 -- disp_get_task_id
10148 -- disp_timed_select
10150 -- The interface versions will have null bodies
10152 -- Disable the generation of these bodies if No_Dispatching_Calls,
10153 -- Ravenscar or ZFP is active.
10155 -- In VM targets we define these primitives in all root tagged types
10156 -- that are not interface types. Done because in VM targets we don't
10157 -- have secondary dispatch tables and any derivation of Tag_Typ may
10158 -- cover limited interfaces (which always have these primitives since
10159 -- they may be ancestors of synchronized interface types).
10161 if Ada_Version
>= Ada_2005
10162 and then not Is_Interface
(Tag_Typ
)
10164 ((Is_Interface
(Etype
(Tag_Typ
))
10165 and then Is_Limited_Record
(Etype
(Tag_Typ
)))
10167 (Is_Concurrent_Record_Type
(Tag_Typ
)
10168 and then Has_Interfaces
(Tag_Typ
))
10170 (not Tagged_Type_Expansion
10171 and then Tag_Typ
= Root_Type
(Tag_Typ
)))
10172 and then not Restriction_Active
(No_Dispatching_Calls
)
10173 and then not Restriction_Active
(No_Select_Statements
)
10174 and then RTE_Available
(RE_Select_Specific_Data
)
10176 Append_To
(Res
, Make_Disp_Asynchronous_Select_Body
(Tag_Typ
));
10177 Append_To
(Res
, Make_Disp_Conditional_Select_Body
(Tag_Typ
));
10178 Append_To
(Res
, Make_Disp_Get_Prim_Op_Kind_Body
(Tag_Typ
));
10179 Append_To
(Res
, Make_Disp_Get_Task_Id_Body
(Tag_Typ
));
10180 Append_To
(Res
, Make_Disp_Requeue_Body
(Tag_Typ
));
10181 Append_To
(Res
, Make_Disp_Timed_Select_Body
(Tag_Typ
));
10184 if not Is_Limited_Type
(Tag_Typ
) and then not Is_Interface
(Tag_Typ
) then
10186 -- Body for equality
10189 Decl
:= Make_Eq_Body
(Tag_Typ
, Eq_Name
);
10190 Append_To
(Res
, Decl
);
10193 -- Body for inequality (if required)
10195 Decl
:= Make_Neq_Body
(Tag_Typ
);
10197 if Present
(Decl
) then
10198 Append_To
(Res
, Decl
);
10201 -- Body for dispatching assignment
10204 Predef_Spec_Or_Body
(Loc
,
10205 Tag_Typ
=> Tag_Typ
,
10206 Name
=> Name_uAssign
,
10207 Profile
=> New_List
(
10208 Make_Parameter_Specification
(Loc
,
10209 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_X
),
10210 Out_Present
=> True,
10211 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
)),
10213 Make_Parameter_Specification
(Loc
,
10214 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_Y
),
10215 Parameter_Type
=> New_Occurrence_Of
(Tag_Typ
, Loc
))),
10218 Set_Handled_Statement_Sequence
(Decl
,
10219 Make_Handled_Sequence_Of_Statements
(Loc
, New_List
(
10220 Make_Assignment_Statement
(Loc
,
10221 Name
=> Make_Identifier
(Loc
, Name_X
),
10222 Expression
=> Make_Identifier
(Loc
, Name_Y
)))));
10224 Append_To
(Res
, Decl
);
10227 -- Generate empty bodies of routines Deep_Adjust and Deep_Finalize for
10228 -- tagged types which do not contain controlled components.
10230 -- Do not generate the routines if finalization is disabled
10232 if Restriction_Active
(No_Finalization
) then
10235 elsif not Has_Controlled_Component
(Tag_Typ
) then
10236 if not Is_Limited_Type
(Tag_Typ
) then
10237 Decl
:= Predef_Deep_Spec
(Loc
, Tag_Typ
, TSS_Deep_Adjust
, True);
10239 if Is_Controlled
(Tag_Typ
) then
10240 Set_Handled_Statement_Sequence
(Decl
,
10241 Make_Handled_Sequence_Of_Statements
(Loc
,
10242 Statements
=> New_List
(
10244 Obj_Ref
=> Make_Identifier
(Loc
, Name_V
),
10245 Typ
=> Tag_Typ
))));
10248 Set_Handled_Statement_Sequence
(Decl
,
10249 Make_Handled_Sequence_Of_Statements
(Loc
,
10250 Statements
=> New_List
(
10251 Make_Null_Statement
(Loc
))));
10254 Append_To
(Res
, Decl
);
10257 Decl
:= Predef_Deep_Spec
(Loc
, Tag_Typ
, TSS_Deep_Finalize
, True);
10259 if Is_Controlled
(Tag_Typ
) then
10260 Set_Handled_Statement_Sequence
(Decl
,
10261 Make_Handled_Sequence_Of_Statements
(Loc
,
10262 Statements
=> New_List
(
10264 (Obj_Ref
=> Make_Identifier
(Loc
, Name_V
),
10265 Typ
=> Tag_Typ
))));
10268 Set_Handled_Statement_Sequence
(Decl
,
10269 Make_Handled_Sequence_Of_Statements
(Loc
,
10270 Statements
=> New_List
(Make_Null_Statement
(Loc
))));
10273 Append_To
(Res
, Decl
);
10277 end Predefined_Primitive_Bodies
;
10279 ---------------------------------
10280 -- Predefined_Primitive_Freeze --
10281 ---------------------------------
10283 function Predefined_Primitive_Freeze
10284 (Tag_Typ
: Entity_Id
) return List_Id
10286 Res
: constant List_Id
:= New_List
;
10291 Prim
:= First_Elmt
(Primitive_Operations
(Tag_Typ
));
10292 while Present
(Prim
) loop
10293 if Is_Predefined_Dispatching_Operation
(Node
(Prim
)) then
10294 Frnodes
:= Freeze_Entity
(Node
(Prim
), Tag_Typ
);
10296 if Present
(Frnodes
) then
10297 Append_List_To
(Res
, Frnodes
);
10305 end Predefined_Primitive_Freeze
;
10307 -------------------------
10308 -- Stream_Operation_OK --
10309 -------------------------
10311 function Stream_Operation_OK
10313 Operation
: TSS_Name_Type
) return Boolean
10315 Has_Predefined_Or_Specified_Stream_Attribute
: Boolean := False;
10318 -- Special case of a limited type extension: a default implementation
10319 -- of the stream attributes Read or Write exists if that attribute
10320 -- has been specified or is available for an ancestor type; a default
10321 -- implementation of the attribute Output (resp. Input) exists if the
10322 -- attribute has been specified or Write (resp. Read) is available for
10323 -- an ancestor type. The last condition only applies under Ada 2005.
10325 if Is_Limited_Type
(Typ
) and then Is_Tagged_Type
(Typ
) then
10326 if Operation
= TSS_Stream_Read
then
10327 Has_Predefined_Or_Specified_Stream_Attribute
:=
10328 Has_Specified_Stream_Read
(Typ
);
10330 elsif Operation
= TSS_Stream_Write
then
10331 Has_Predefined_Or_Specified_Stream_Attribute
:=
10332 Has_Specified_Stream_Write
(Typ
);
10334 elsif Operation
= TSS_Stream_Input
then
10335 Has_Predefined_Or_Specified_Stream_Attribute
:=
10336 Has_Specified_Stream_Input
(Typ
)
10338 (Ada_Version
>= Ada_2005
10339 and then Stream_Operation_OK
(Typ
, TSS_Stream_Read
));
10341 elsif Operation
= TSS_Stream_Output
then
10342 Has_Predefined_Or_Specified_Stream_Attribute
:=
10343 Has_Specified_Stream_Output
(Typ
)
10345 (Ada_Version
>= Ada_2005
10346 and then Stream_Operation_OK
(Typ
, TSS_Stream_Write
));
10349 -- Case of inherited TSS_Stream_Read or TSS_Stream_Write
10351 if not Has_Predefined_Or_Specified_Stream_Attribute
10352 and then Is_Derived_Type
(Typ
)
10353 and then (Operation
= TSS_Stream_Read
10354 or else Operation
= TSS_Stream_Write
)
10356 Has_Predefined_Or_Specified_Stream_Attribute
:=
10358 (Find_Inherited_TSS
(Base_Type
(Etype
(Typ
)), Operation
));
10362 -- If the type is not limited, or else is limited but the attribute is
10363 -- explicitly specified or is predefined for the type, then return True,
10364 -- unless other conditions prevail, such as restrictions prohibiting
10365 -- streams or dispatching operations. We also return True for limited
10366 -- interfaces, because they may be extended by nonlimited types and
10367 -- permit inheritance in this case (addresses cases where an abstract
10368 -- extension doesn't get 'Input declared, as per comments below, but
10369 -- 'Class'Input must still be allowed). Note that attempts to apply
10370 -- stream attributes to a limited interface or its class-wide type
10371 -- (or limited extensions thereof) will still get properly rejected
10372 -- by Check_Stream_Attribute.
10374 -- We exclude the Input operation from being a predefined subprogram in
10375 -- the case where the associated type is an abstract extension, because
10376 -- the attribute is not callable in that case, per 13.13.2(49/2). Also,
10377 -- we don't want an abstract version created because types derived from
10378 -- the abstract type may not even have Input available (for example if
10379 -- derived from a private view of the abstract type that doesn't have
10380 -- a visible Input).
10382 -- Do not generate stream routines for type Finalization_Master because
10383 -- a master may never appear in types and therefore cannot be read or
10387 (not Is_Limited_Type
(Typ
)
10388 or else Is_Interface
(Typ
)
10389 or else Has_Predefined_Or_Specified_Stream_Attribute
)
10391 (Operation
/= TSS_Stream_Input
10392 or else not Is_Abstract_Type
(Typ
)
10393 or else not Is_Derived_Type
(Typ
))
10394 and then not Has_Unknown_Discriminants
(Typ
)
10396 (Is_Interface
(Typ
)
10398 (Is_Task_Interface
(Typ
)
10399 or else Is_Protected_Interface
(Typ
)
10400 or else Is_Synchronized_Interface
(Typ
)))
10401 and then not Restriction_Active
(No_Streams
)
10402 and then not Restriction_Active
(No_Dispatch
)
10403 and then No
(No_Tagged_Streams_Pragma
(Typ
))
10404 and then not No_Run_Time_Mode
10405 and then RTE_Available
(RE_Tag
)
10406 and then No
(Type_Without_Stream_Operation
(Typ
))
10407 and then RTE_Available
(RE_Root_Stream_Type
)
10408 and then not Is_RTE
(Typ
, RE_Finalization_Master
);
10409 end Stream_Operation_OK
;