1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2010, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
18 -- You should have received a copy of the GNU General Public License along --
19 -- with this program; see file COPYING3. If not see --
20 -- <http://www.gnu.org/licenses/>. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 with Atree
; use Atree
;
28 with Checks
; use Checks
;
29 with Einfo
; use Einfo
;
30 with Elists
; use Elists
;
31 with Exp_Atag
; use Exp_Atag
;
32 with Exp_Ch2
; use Exp_Ch2
;
33 with Exp_Ch3
; use Exp_Ch3
;
34 with Exp_Ch6
; use Exp_Ch6
;
35 with Exp_Ch9
; use Exp_Ch9
;
36 with Exp_Dist
; use Exp_Dist
;
37 with Exp_Imgv
; use Exp_Imgv
;
38 with Exp_Pakd
; use Exp_Pakd
;
39 with Exp_Strm
; use Exp_Strm
;
40 with Exp_Tss
; use Exp_Tss
;
41 with Exp_Util
; use Exp_Util
;
42 with Exp_VFpt
; use Exp_VFpt
;
43 with Fname
; use Fname
;
44 with Freeze
; use Freeze
;
45 with Gnatvsn
; use Gnatvsn
;
46 with Itypes
; use Itypes
;
48 with Namet
; use Namet
;
49 with Nmake
; use Nmake
;
50 with Nlists
; use Nlists
;
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_Ch6
; use Sem_Ch6
;
58 with Sem_Ch7
; use Sem_Ch7
;
59 with Sem_Ch8
; use Sem_Ch8
;
60 with Sem_Eval
; use Sem_Eval
;
61 with Sem_Res
; use Sem_Res
;
62 with Sem_Util
; use Sem_Util
;
63 with Sinfo
; use Sinfo
;
64 with Snames
; use Snames
;
65 with Stand
; use Stand
;
66 with Stringt
; use Stringt
;
67 with Targparm
; use Targparm
;
68 with Tbuild
; use Tbuild
;
69 with Ttypes
; use Ttypes
;
70 with Uintp
; use Uintp
;
71 with Uname
; use Uname
;
72 with Validsw
; use Validsw
;
74 package body Exp_Attr
is
76 -----------------------
77 -- Local Subprograms --
78 -----------------------
80 procedure Compile_Stream_Body_In_Scope
85 -- The body for a stream subprogram may be generated outside of the scope
86 -- of the type. If the type is fully private, it may depend on the full
87 -- view of other types (e.g. indices) that are currently private as well.
88 -- We install the declarations of the package in which the type is declared
89 -- before compiling the body in what is its proper environment. The Check
90 -- parameter indicates if checks are to be suppressed for the stream body.
91 -- We suppress checks for array/record reads, since the rule is that these
92 -- are like assignments, out of range values due to uninitialized storage,
93 -- or other invalid values do NOT cause a Constraint_Error to be raised.
95 procedure Expand_Access_To_Protected_Op
100 -- An attribute reference to a protected subprogram is transformed into
101 -- a pair of pointers: one to the object, and one to the operations.
102 -- This expansion is performed for 'Access and for 'Unrestricted_Access.
104 procedure Expand_Fpt_Attribute
109 -- This procedure expands a call to a floating-point attribute function.
110 -- N is the attribute reference node, and Args is a list of arguments to
111 -- be passed to the function call. Pkg identifies the package containing
112 -- the appropriate instantiation of System.Fat_Gen. Float arguments in Args
113 -- have already been converted to the floating-point type for which Pkg was
114 -- instantiated. The Nam argument is the relevant attribute processing
115 -- routine to be called. This is the same as the attribute name, except in
116 -- the Unaligned_Valid case.
118 procedure Expand_Fpt_Attribute_R
(N
: Node_Id
);
119 -- This procedure expands a call to a floating-point attribute function
120 -- that takes a single floating-point argument. The function to be called
121 -- is always the same as the attribute name.
123 procedure Expand_Fpt_Attribute_RI
(N
: Node_Id
);
124 -- This procedure expands a call to a floating-point attribute function
125 -- that takes one floating-point argument and one integer argument. The
126 -- function to be called is always the same as the attribute name.
128 procedure Expand_Fpt_Attribute_RR
(N
: Node_Id
);
129 -- This procedure expands a call to a floating-point attribute function
130 -- that takes two floating-point arguments. The function to be called
131 -- is always the same as the attribute name.
133 procedure Expand_Pred_Succ
(N
: Node_Id
);
134 -- Handles expansion of Pred or Succ attributes for case of non-real
135 -- operand with overflow checking required.
137 function Get_Index_Subtype
(N
: Node_Id
) return Entity_Id
;
138 -- Used for Last, Last, and Length, when the prefix is an array type.
139 -- Obtains the corresponding index subtype.
141 procedure Find_Fat_Info
143 Fat_Type
: out Entity_Id
;
144 Fat_Pkg
: out RE_Id
);
145 -- Given a floating-point type T, identifies the package containing the
146 -- attributes for this type (returned in Fat_Pkg), and the corresponding
147 -- type for which this package was instantiated from Fat_Gen. Error if T
148 -- is not a floating-point type.
150 function Find_Stream_Subprogram
152 Nam
: TSS_Name_Type
) return Entity_Id
;
153 -- Returns the stream-oriented subprogram attribute for Typ. For tagged
154 -- types, the corresponding primitive operation is looked up, else the
155 -- appropriate TSS from the type itself, or from its closest ancestor
156 -- defining it, is returned. In both cases, inheritance of representation
157 -- aspects is thus taken into account.
159 function Get_Stream_Convert_Pragma
(T
: Entity_Id
) return Node_Id
;
160 -- Given a type, find a corresponding stream convert pragma that applies to
161 -- the implementation base type of this type (Typ). If found, return the
162 -- pragma node, otherwise return Empty if no pragma is found.
164 function Is_Constrained_Packed_Array
(Typ
: Entity_Id
) return Boolean;
165 -- Utility for array attributes, returns true on packed constrained
166 -- arrays, and on access to same.
168 function Is_Inline_Floating_Point_Attribute
(N
: Node_Id
) return Boolean;
169 -- Returns true iff the given node refers to an attribute call that
170 -- can be expanded directly by the back end and does not need front end
171 -- expansion. Typically used for rounding and truncation attributes that
172 -- appear directly inside a conversion to integer.
174 ----------------------------------
175 -- Compile_Stream_Body_In_Scope --
176 ----------------------------------
178 procedure Compile_Stream_Body_In_Scope
184 Installed
: Boolean := False;
185 Scop
: constant Entity_Id
:= Scope
(Arr
);
186 Curr
: constant Entity_Id
:= Current_Scope
;
190 and then not In_Open_Scopes
(Scop
)
191 and then Ekind
(Scop
) = E_Package
194 Install_Visible_Declarations
(Scop
);
195 Install_Private_Declarations
(Scop
);
198 -- The entities in the package are now visible, but the generated
199 -- stream entity must appear in the current scope (usually an
200 -- enclosing stream function) so that itypes all have their proper
207 Insert_Action
(N
, Decl
);
209 Insert_Action
(N
, Decl
, Suppress
=> All_Checks
);
214 -- Remove extra copy of current scope, and package itself
217 End_Package_Scope
(Scop
);
219 end Compile_Stream_Body_In_Scope
;
221 -----------------------------------
222 -- Expand_Access_To_Protected_Op --
223 -----------------------------------
225 procedure Expand_Access_To_Protected_Op
230 -- The value of the attribute_reference is a record containing two
231 -- fields: an access to the protected object, and an access to the
232 -- subprogram itself. The prefix is a selected component.
234 Loc
: constant Source_Ptr
:= Sloc
(N
);
236 Btyp
: constant Entity_Id
:= Base_Type
(Typ
);
239 E_T
: constant Entity_Id
:= Equivalent_Type
(Btyp
);
240 Acc
: constant Entity_Id
:=
241 Etype
(Next_Component
(First_Component
(E_T
)));
245 function May_Be_External_Call
return Boolean;
246 -- If the 'Access is to a local operation, but appears in a context
247 -- where it may lead to a call from outside the object, we must treat
248 -- this as an external call. Clearly we cannot tell without full
249 -- flow analysis, and a subsequent call that uses this 'Access may
250 -- lead to a bounded error (trying to seize locks twice, e.g.). For
251 -- now we treat 'Access as a potential external call if it is an actual
252 -- in a call to an outside subprogram.
254 --------------------------
255 -- May_Be_External_Call --
256 --------------------------
258 function May_Be_External_Call
return Boolean is
260 Par
: Node_Id
:= Parent
(N
);
263 -- Account for the case where the Access attribute is part of a
264 -- named parameter association.
266 if Nkind
(Par
) = N_Parameter_Association
then
270 if Nkind_In
(Par
, N_Procedure_Call_Statement
, N_Function_Call
)
271 and then Is_Entity_Name
(Name
(Par
))
273 Subp
:= Entity
(Name
(Par
));
274 return not In_Open_Scopes
(Scope
(Subp
));
278 end May_Be_External_Call
;
280 -- Start of processing for Expand_Access_To_Protected_Op
283 -- Within the body of the protected type, the prefix designates a local
284 -- operation, and the object is the first parameter of the corresponding
285 -- protected body of the current enclosing operation.
287 if Is_Entity_Name
(Pref
) then
288 if May_Be_External_Call
then
290 New_Occurrence_Of
(External_Subprogram
(Entity
(Pref
)), Loc
);
294 (Protected_Body_Subprogram
(Entity
(Pref
)), Loc
);
297 -- Don't traverse the scopes when the attribute occurs within an init
298 -- proc, because we directly use the _init formal of the init proc in
301 Curr
:= Current_Scope
;
302 if not Is_Init_Proc
(Curr
) then
303 pragma Assert
(In_Open_Scopes
(Scope
(Entity
(Pref
))));
305 while Scope
(Curr
) /= Scope
(Entity
(Pref
)) loop
306 Curr
:= Scope
(Curr
);
310 -- In case of protected entries the first formal of its Protected_
311 -- Body_Subprogram is the address of the object.
313 if Ekind
(Curr
) = E_Entry
then
317 (Protected_Body_Subprogram
(Curr
)), Loc
);
319 -- If the current scope is an init proc, then use the address of the
320 -- _init formal as the object reference.
322 elsif Is_Init_Proc
(Curr
) then
324 Make_Attribute_Reference
(Loc
,
325 Prefix
=> New_Occurrence_Of
(First_Formal
(Curr
), Loc
),
326 Attribute_Name
=> Name_Address
);
328 -- In case of protected subprograms the first formal of its
329 -- Protected_Body_Subprogram is the object and we get its address.
333 Make_Attribute_Reference
(Loc
,
337 (Protected_Body_Subprogram
(Curr
)), Loc
),
338 Attribute_Name
=> Name_Address
);
341 -- Case where the prefix is not an entity name. Find the
342 -- version of the protected operation to be called from
343 -- outside the protected object.
349 (Entity
(Selector_Name
(Pref
))), Loc
);
352 Make_Attribute_Reference
(Loc
,
353 Prefix
=> Relocate_Node
(Prefix
(Pref
)),
354 Attribute_Name
=> Name_Address
);
358 Make_Attribute_Reference
(Loc
,
360 Attribute_Name
=> Name_Access
);
362 -- We set the type of the access reference to the already generated
363 -- access_to_subprogram type, and declare the reference analyzed, to
364 -- prevent further expansion when the enclosing aggregate is analyzed.
366 Set_Etype
(Sub_Ref
, Acc
);
367 Set_Analyzed
(Sub_Ref
);
371 Expressions
=> New_List
(Obj_Ref
, Sub_Ref
));
373 Freeze_Before
(N
, Entity
(Sub
));
375 Analyze_And_Resolve
(N
, E_T
);
377 -- For subsequent analysis, the node must retain its type. The backend
378 -- will replace it with the equivalent type where needed.
381 end Expand_Access_To_Protected_Op
;
383 --------------------------
384 -- Expand_Fpt_Attribute --
385 --------------------------
387 procedure Expand_Fpt_Attribute
393 Loc
: constant Source_Ptr
:= Sloc
(N
);
394 Typ
: constant Entity_Id
:= Etype
(N
);
398 -- The function name is the selected component Attr_xxx.yyy where
399 -- Attr_xxx is the package name, and yyy is the argument Nam.
401 -- Note: it would be more usual to have separate RE entries for each
402 -- of the entities in the Fat packages, but first they have identical
403 -- names (so we would have to have lots of renaming declarations to
404 -- meet the normal RE rule of separate names for all runtime entities),
405 -- and second there would be an awful lot of them!
408 Make_Selected_Component
(Loc
,
409 Prefix
=> New_Reference_To
(RTE
(Pkg
), Loc
),
410 Selector_Name
=> Make_Identifier
(Loc
, Nam
));
412 -- The generated call is given the provided set of parameters, and then
413 -- wrapped in a conversion which converts the result to the target type
414 -- We use the base type as the target because a range check may be
418 Unchecked_Convert_To
(Base_Type
(Etype
(N
)),
419 Make_Function_Call
(Loc
,
421 Parameter_Associations
=> Args
)));
423 Analyze_And_Resolve
(N
, Typ
);
424 end Expand_Fpt_Attribute
;
426 ----------------------------
427 -- Expand_Fpt_Attribute_R --
428 ----------------------------
430 -- The single argument is converted to its root type to call the
431 -- appropriate runtime function, with the actual call being built
432 -- by Expand_Fpt_Attribute
434 procedure Expand_Fpt_Attribute_R
(N
: Node_Id
) is
435 E1
: constant Node_Id
:= First
(Expressions
(N
));
439 Find_Fat_Info
(Etype
(E1
), Ftp
, Pkg
);
441 (N
, Pkg
, Attribute_Name
(N
),
442 New_List
(Unchecked_Convert_To
(Ftp
, Relocate_Node
(E1
))));
443 end Expand_Fpt_Attribute_R
;
445 -----------------------------
446 -- Expand_Fpt_Attribute_RI --
447 -----------------------------
449 -- The first argument is converted to its root type and the second
450 -- argument is converted to standard long long integer to call the
451 -- appropriate runtime function, with the actual call being built
452 -- by Expand_Fpt_Attribute
454 procedure Expand_Fpt_Attribute_RI
(N
: Node_Id
) is
455 E1
: constant Node_Id
:= First
(Expressions
(N
));
458 E2
: constant Node_Id
:= Next
(E1
);
460 Find_Fat_Info
(Etype
(E1
), Ftp
, Pkg
);
462 (N
, Pkg
, Attribute_Name
(N
),
464 Unchecked_Convert_To
(Ftp
, Relocate_Node
(E1
)),
465 Unchecked_Convert_To
(Standard_Integer
, Relocate_Node
(E2
))));
466 end Expand_Fpt_Attribute_RI
;
468 -----------------------------
469 -- Expand_Fpt_Attribute_RR --
470 -----------------------------
472 -- The two arguments are converted to their root types to call the
473 -- appropriate runtime function, with the actual call being built
474 -- by Expand_Fpt_Attribute
476 procedure Expand_Fpt_Attribute_RR
(N
: Node_Id
) is
477 E1
: constant Node_Id
:= First
(Expressions
(N
));
480 E2
: constant Node_Id
:= Next
(E1
);
482 Find_Fat_Info
(Etype
(E1
), Ftp
, Pkg
);
484 (N
, Pkg
, Attribute_Name
(N
),
486 Unchecked_Convert_To
(Ftp
, Relocate_Node
(E1
)),
487 Unchecked_Convert_To
(Ftp
, Relocate_Node
(E2
))));
488 end Expand_Fpt_Attribute_RR
;
490 ----------------------------------
491 -- Expand_N_Attribute_Reference --
492 ----------------------------------
494 procedure Expand_N_Attribute_Reference
(N
: Node_Id
) is
495 Loc
: constant Source_Ptr
:= Sloc
(N
);
496 Typ
: constant Entity_Id
:= Etype
(N
);
497 Btyp
: constant Entity_Id
:= Base_Type
(Typ
);
498 Pref
: constant Node_Id
:= Prefix
(N
);
499 Ptyp
: constant Entity_Id
:= Etype
(Pref
);
500 Exprs
: constant List_Id
:= Expressions
(N
);
501 Id
: constant Attribute_Id
:= Get_Attribute_Id
(Attribute_Name
(N
));
503 procedure Rewrite_Stream_Proc_Call
(Pname
: Entity_Id
);
504 -- Rewrites a stream attribute for Read, Write or Output with the
505 -- procedure call. Pname is the entity for the procedure to call.
507 ------------------------------
508 -- Rewrite_Stream_Proc_Call --
509 ------------------------------
511 procedure Rewrite_Stream_Proc_Call
(Pname
: Entity_Id
) is
512 Item
: constant Node_Id
:= Next
(First
(Exprs
));
513 Formal
: constant Entity_Id
:= Next_Formal
(First_Formal
(Pname
));
514 Formal_Typ
: constant Entity_Id
:= Etype
(Formal
);
515 Is_Written
: constant Boolean := (Ekind
(Formal
) /= E_In_Parameter
);
518 -- The expansion depends on Item, the second actual, which is
519 -- the object being streamed in or out.
521 -- If the item is a component of a packed array type, and
522 -- a conversion is needed on exit, we introduce a temporary to
523 -- hold the value, because otherwise the packed reference will
524 -- not be properly expanded.
526 if Nkind
(Item
) = N_Indexed_Component
527 and then Is_Packed
(Base_Type
(Etype
(Prefix
(Item
))))
528 and then Base_Type
(Etype
(Item
)) /= Base_Type
(Formal_Typ
)
532 Temp
: constant Entity_Id
:= Make_Temporary
(Loc
, 'V');
538 Make_Object_Declaration
(Loc
,
539 Defining_Identifier
=> Temp
,
541 New_Occurrence_Of
(Formal_Typ
, Loc
));
542 Set_Etype
(Temp
, Formal_Typ
);
545 Make_Assignment_Statement
(Loc
,
546 Name
=> New_Copy_Tree
(Item
),
549 (Etype
(Item
), New_Occurrence_Of
(Temp
, Loc
)));
551 Rewrite
(Item
, New_Occurrence_Of
(Temp
, Loc
));
555 Make_Procedure_Call_Statement
(Loc
,
556 Name
=> New_Occurrence_Of
(Pname
, Loc
),
557 Parameter_Associations
=> Exprs
),
560 Rewrite
(N
, Make_Null_Statement
(Loc
));
565 -- For the class-wide dispatching cases, and for cases in which
566 -- the base type of the second argument matches the base type of
567 -- the corresponding formal parameter (that is to say the stream
568 -- operation is not inherited), we are all set, and can use the
569 -- argument unchanged.
571 -- For all other cases we do an unchecked conversion of the second
572 -- parameter to the type of the formal of the procedure we are
573 -- calling. This deals with the private type cases, and with going
574 -- to the root type as required in elementary type case.
576 if not Is_Class_Wide_Type
(Entity
(Pref
))
577 and then not Is_Class_Wide_Type
(Etype
(Item
))
578 and then Base_Type
(Etype
(Item
)) /= Base_Type
(Formal_Typ
)
581 Unchecked_Convert_To
(Formal_Typ
, Relocate_Node
(Item
)));
583 -- For untagged derived types set Assignment_OK, to prevent
584 -- copies from being created when the unchecked conversion
585 -- is expanded (which would happen in Remove_Side_Effects
586 -- if Expand_N_Unchecked_Conversion were allowed to call
587 -- Force_Evaluation). The copy could violate Ada semantics
588 -- in cases such as an actual that is an out parameter.
589 -- Note that this approach is also used in exp_ch7 for calls
590 -- to controlled type operations to prevent problems with
591 -- actuals wrapped in unchecked conversions.
593 if Is_Untagged_Derivation
(Etype
(Expression
(Item
))) then
594 Set_Assignment_OK
(Item
);
598 -- The stream operation to call maybe a renaming created by
599 -- an attribute definition clause, and may not be frozen yet.
600 -- Ensure that it has the necessary extra formals.
602 if not Is_Frozen
(Pname
) then
603 Create_Extra_Formals
(Pname
);
606 -- And now rewrite the call
609 Make_Procedure_Call_Statement
(Loc
,
610 Name
=> New_Occurrence_Of
(Pname
, Loc
),
611 Parameter_Associations
=> Exprs
));
614 end Rewrite_Stream_Proc_Call
;
616 -- Start of processing for Expand_N_Attribute_Reference
619 -- Do required validity checking, if enabled. Do not apply check to
620 -- output parameters of an Asm instruction, since the value of this
621 -- is not set till after the attribute has been elaborated, and do
622 -- not apply the check to the arguments of a 'Read or 'Input attribute
623 -- reference since the scalar argument is an OUT scalar.
625 if Validity_Checks_On
and then Validity_Check_Operands
626 and then Id
/= Attribute_Asm_Output
627 and then Id
/= Attribute_Read
628 and then Id
/= Attribute_Input
633 Expr
:= First
(Expressions
(N
));
634 while Present
(Expr
) loop
641 -- Ada 2005 (AI-318-02): If attribute prefix is a call to a build-in-
642 -- place function, then a temporary return object needs to be created
643 -- and access to it must be passed to the function. Currently we limit
644 -- such functions to those with inherently limited result subtypes, but
645 -- eventually we plan to expand the functions that are treated as
646 -- build-in-place to include other composite result types.
648 if Ada_Version
>= Ada_05
649 and then Is_Build_In_Place_Function_Call
(Pref
)
651 Make_Build_In_Place_Call_In_Anonymous_Context
(Pref
);
654 -- If prefix is a protected type name, this is a reference to the
655 -- current instance of the type. For a component definition, nothing
656 -- to do (expansion will occur in the init proc). In other contexts,
657 -- rewrite into reference to current instance.
659 if Is_Protected_Self_Reference
(Pref
)
661 (Nkind_In
(Parent
(N
), N_Index_Or_Discriminant_Constraint
,
662 N_Discriminant_Association
)
663 and then Nkind
(Parent
(Parent
(Parent
(Parent
(N
))))) =
664 N_Component_Definition
)
666 Rewrite
(Pref
, Concurrent_Ref
(Pref
));
670 -- Remaining processing depends on specific attribute
678 when Attribute_Access |
679 Attribute_Unchecked_Access |
680 Attribute_Unrestricted_Access
=>
682 Access_Cases
: declare
683 Ref_Object
: constant Node_Id
:= Get_Referenced_Object
(Pref
);
684 Btyp_DDT
: Entity_Id
;
686 function Enclosing_Object
(N
: Node_Id
) return Node_Id
;
687 -- If N denotes a compound name (selected component, indexed
688 -- component, or slice), returns the name of the outermost such
689 -- enclosing object. Otherwise returns N. If the object is a
690 -- renaming, then the renamed object is returned.
692 ----------------------
693 -- Enclosing_Object --
694 ----------------------
696 function Enclosing_Object
(N
: Node_Id
) return Node_Id
is
701 while Nkind_In
(Obj_Name
, N_Selected_Component
,
705 Obj_Name
:= Prefix
(Obj_Name
);
708 return Get_Referenced_Object
(Obj_Name
);
709 end Enclosing_Object
;
711 -- Local declarations
713 Enc_Object
: constant Node_Id
:= Enclosing_Object
(Ref_Object
);
715 -- Start of processing for Access_Cases
718 Btyp_DDT
:= Designated_Type
(Btyp
);
720 -- Handle designated types that come from the limited view
722 if Ekind
(Btyp_DDT
) = E_Incomplete_Type
723 and then From_With_Type
(Btyp_DDT
)
724 and then Present
(Non_Limited_View
(Btyp_DDT
))
726 Btyp_DDT
:= Non_Limited_View
(Btyp_DDT
);
728 elsif Is_Class_Wide_Type
(Btyp_DDT
)
729 and then Ekind
(Etype
(Btyp_DDT
)) = E_Incomplete_Type
730 and then From_With_Type
(Etype
(Btyp_DDT
))
731 and then Present
(Non_Limited_View
(Etype
(Btyp_DDT
)))
732 and then Present
(Class_Wide_Type
733 (Non_Limited_View
(Etype
(Btyp_DDT
))))
736 Class_Wide_Type
(Non_Limited_View
(Etype
(Btyp_DDT
)));
739 -- In order to improve the text of error messages, the designated
740 -- type of access-to-subprogram itypes is set by the semantics as
741 -- the associated subprogram entity (see sem_attr). Now we replace
742 -- such node with the proper E_Subprogram_Type itype.
744 if Id
= Attribute_Unrestricted_Access
745 and then Is_Subprogram
(Directly_Designated_Type
(Typ
))
747 -- The following conditions ensure that this special management
748 -- is done only for "Address!(Prim'Unrestricted_Access)" nodes.
749 -- At this stage other cases in which the designated type is
750 -- still a subprogram (instead of an E_Subprogram_Type) are
751 -- wrong because the semantics must have overridden the type of
752 -- the node with the type imposed by the context.
754 if Nkind
(Parent
(N
)) = N_Unchecked_Type_Conversion
755 and then Etype
(Parent
(N
)) = RTE
(RE_Prim_Ptr
)
757 Set_Etype
(N
, RTE
(RE_Prim_Ptr
));
761 Subp
: constant Entity_Id
:=
762 Directly_Designated_Type
(Typ
);
764 Extra
: Entity_Id
:= Empty
;
765 New_Formal
: Entity_Id
;
766 Old_Formal
: Entity_Id
:= First_Formal
(Subp
);
767 Subp_Typ
: Entity_Id
;
770 Subp_Typ
:= Create_Itype
(E_Subprogram_Type
, N
);
771 Set_Etype
(Subp_Typ
, Etype
(Subp
));
772 Set_Returns_By_Ref
(Subp_Typ
, Returns_By_Ref
(Subp
));
774 if Present
(Old_Formal
) then
775 New_Formal
:= New_Copy
(Old_Formal
);
776 Set_First_Entity
(Subp_Typ
, New_Formal
);
779 Set_Scope
(New_Formal
, Subp_Typ
);
780 Etyp
:= Etype
(New_Formal
);
782 -- Handle itypes. There is no need to duplicate
783 -- here the itypes associated with record types
784 -- (i.e the implicit full view of private types).
787 and then Ekind
(Base_Type
(Etyp
)) /= E_Record_Type
789 Extra
:= New_Copy
(Etyp
);
790 Set_Parent
(Extra
, New_Formal
);
791 Set_Etype
(New_Formal
, Extra
);
792 Set_Scope
(Extra
, Subp_Typ
);
796 Next_Formal
(Old_Formal
);
797 exit when No
(Old_Formal
);
799 Set_Next_Entity
(New_Formal
,
800 New_Copy
(Old_Formal
));
801 Next_Entity
(New_Formal
);
804 Set_Next_Entity
(New_Formal
, Empty
);
805 Set_Last_Entity
(Subp_Typ
, Extra
);
808 -- Now that the explicit formals have been duplicated,
809 -- any extra formals needed by the subprogram must be
812 if Present
(Extra
) then
813 Set_Extra_Formal
(Extra
, Empty
);
816 Create_Extra_Formals
(Subp_Typ
);
817 Set_Directly_Designated_Type
(Typ
, Subp_Typ
);
822 if Is_Access_Protected_Subprogram_Type
(Btyp
) then
823 Expand_Access_To_Protected_Op
(N
, Pref
, Typ
);
825 -- If prefix is a type name, this is a reference to the current
826 -- instance of the type, within its initialization procedure.
828 elsif Is_Entity_Name
(Pref
)
829 and then Is_Type
(Entity
(Pref
))
836 -- If the current instance name denotes a task type, then
837 -- the access attribute is rewritten to be the name of the
838 -- "_task" parameter associated with the task type's task
839 -- procedure. An unchecked conversion is applied to ensure
840 -- a type match in cases of expander-generated calls (e.g.
843 if Is_Task_Type
(Entity
(Pref
)) then
845 First_Entity
(Get_Task_Body_Procedure
(Entity
(Pref
)));
846 while Present
(Formal
) loop
847 exit when Chars
(Formal
) = Name_uTask
;
848 Next_Entity
(Formal
);
851 pragma Assert
(Present
(Formal
));
854 Unchecked_Convert_To
(Typ
,
855 New_Occurrence_Of
(Formal
, Loc
)));
858 -- The expression must appear in a default expression,
859 -- (which in the initialization procedure is the
860 -- right-hand side of an assignment), and not in a
861 -- discriminant constraint.
865 while Present
(Par
) loop
866 exit when Nkind
(Par
) = N_Assignment_Statement
;
868 if Nkind
(Par
) = N_Component_Declaration
then
875 if Present
(Par
) then
877 Make_Attribute_Reference
(Loc
,
878 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
879 Attribute_Name
=> Attribute_Name
(N
)));
881 Analyze_And_Resolve
(N
, Typ
);
886 -- If the prefix of an Access attribute is a dereference of an
887 -- access parameter (or a renaming of such a dereference, or a
888 -- subcomponent of such a dereference) and the context is a
889 -- general access type (including the type of an object or
890 -- component with an access_definition, but not the anonymous
891 -- type of an access parameter or access discriminant), then
892 -- apply an accessibility check to the access parameter. We used
893 -- to rewrite the access parameter as a type conversion, but that
894 -- could only be done if the immediate prefix of the Access
895 -- attribute was the dereference, and didn't handle cases where
896 -- the attribute is applied to a subcomponent of the dereference,
897 -- since there's generally no available, appropriate access type
898 -- to convert to in that case. The attribute is passed as the
899 -- point to insert the check, because the access parameter may
900 -- come from a renaming, possibly in a different scope, and the
901 -- check must be associated with the attribute itself.
903 elsif Id
= Attribute_Access
904 and then Nkind
(Enc_Object
) = N_Explicit_Dereference
905 and then Is_Entity_Name
(Prefix
(Enc_Object
))
906 and then (Ekind
(Btyp
) = E_General_Access_Type
907 or else Is_Local_Anonymous_Access
(Btyp
))
908 and then Ekind
(Entity
(Prefix
(Enc_Object
))) in Formal_Kind
909 and then Ekind
(Etype
(Entity
(Prefix
(Enc_Object
))))
910 = E_Anonymous_Access_Type
911 and then Present
(Extra_Accessibility
912 (Entity
(Prefix
(Enc_Object
))))
914 Apply_Accessibility_Check
(Prefix
(Enc_Object
), Typ
, N
);
916 -- Ada 2005 (AI-251): If the designated type is an interface we
917 -- add an implicit conversion to force the displacement of the
918 -- pointer to reference the secondary dispatch table.
920 elsif Is_Interface
(Btyp_DDT
)
921 and then (Comes_From_Source
(N
)
922 or else Comes_From_Source
(Ref_Object
)
923 or else (Nkind
(Ref_Object
) in N_Has_Chars
924 and then Chars
(Ref_Object
) = Name_uInit
))
926 if Nkind
(Ref_Object
) /= N_Explicit_Dereference
then
928 -- No implicit conversion required if types match, or if
929 -- the prefix is the class_wide_type of the interface. In
930 -- either case passing an object of the interface type has
931 -- already set the pointer correctly.
933 if Btyp_DDT
= Etype
(Ref_Object
)
934 or else (Is_Class_Wide_Type
(Etype
(Ref_Object
))
936 Class_Wide_Type
(Btyp_DDT
) = Etype
(Ref_Object
))
942 Convert_To
(Btyp_DDT
,
943 New_Copy_Tree
(Prefix
(N
))));
945 Analyze_And_Resolve
(Prefix
(N
), Btyp_DDT
);
948 -- When the object is an explicit dereference, convert the
949 -- dereference's prefix.
953 Obj_DDT
: constant Entity_Id
:=
955 (Directly_Designated_Type
956 (Etype
(Prefix
(Ref_Object
))));
958 -- No implicit conversion required if designated types
961 if Obj_DDT
/= Btyp_DDT
962 and then not (Is_Class_Wide_Type
(Obj_DDT
)
963 and then Etype
(Obj_DDT
) = Btyp_DDT
)
967 New_Copy_Tree
(Prefix
(Ref_Object
))));
968 Analyze_And_Resolve
(N
, Typ
);
979 -- Transforms 'Adjacent into a call to the floating-point attribute
980 -- function Adjacent in Fat_xxx (where xxx is the root type)
982 when Attribute_Adjacent
=>
983 Expand_Fpt_Attribute_RR
(N
);
989 when Attribute_Address
=> Address
: declare
990 Task_Proc
: Entity_Id
;
993 -- If the prefix is a task or a task type, the useful address is that
994 -- of the procedure for the task body, i.e. the actual program unit.
995 -- We replace the original entity with that of the procedure.
997 if Is_Entity_Name
(Pref
)
998 and then Is_Task_Type
(Entity
(Pref
))
1000 Task_Proc
:= Next_Entity
(Root_Type
(Ptyp
));
1002 while Present
(Task_Proc
) loop
1003 exit when Ekind
(Task_Proc
) = E_Procedure
1004 and then Etype
(First_Formal
(Task_Proc
)) =
1005 Corresponding_Record_Type
(Ptyp
);
1006 Next_Entity
(Task_Proc
);
1009 if Present
(Task_Proc
) then
1010 Set_Entity
(Pref
, Task_Proc
);
1011 Set_Etype
(Pref
, Etype
(Task_Proc
));
1014 -- Similarly, the address of a protected operation is the address
1015 -- of the corresponding protected body, regardless of the protected
1016 -- object from which it is selected.
1018 elsif Nkind
(Pref
) = N_Selected_Component
1019 and then Is_Subprogram
(Entity
(Selector_Name
(Pref
)))
1020 and then Is_Protected_Type
(Scope
(Entity
(Selector_Name
(Pref
))))
1024 External_Subprogram
(Entity
(Selector_Name
(Pref
))), Loc
));
1026 elsif Nkind
(Pref
) = N_Explicit_Dereference
1027 and then Ekind
(Ptyp
) = E_Subprogram_Type
1028 and then Convention
(Ptyp
) = Convention_Protected
1030 -- The prefix is be a dereference of an access_to_protected_
1031 -- subprogram. The desired address is the second component of
1032 -- the record that represents the access.
1035 Addr
: constant Entity_Id
:= Etype
(N
);
1036 Ptr
: constant Node_Id
:= Prefix
(Pref
);
1037 T
: constant Entity_Id
:=
1038 Equivalent_Type
(Base_Type
(Etype
(Ptr
)));
1042 Unchecked_Convert_To
(Addr
,
1043 Make_Selected_Component
(Loc
,
1044 Prefix
=> Unchecked_Convert_To
(T
, Ptr
),
1045 Selector_Name
=> New_Occurrence_Of
(
1046 Next_Entity
(First_Entity
(T
)), Loc
))));
1048 Analyze_And_Resolve
(N
, Addr
);
1051 -- Ada 2005 (AI-251): Class-wide interface objects are always
1052 -- "displaced" to reference the tag associated with the interface
1053 -- type. In order to obtain the real address of such objects we
1054 -- generate a call to a run-time subprogram that returns the base
1055 -- address of the object.
1057 -- This processing is not needed in the VM case, where dispatching
1058 -- issues are taken care of by the virtual machine.
1060 elsif Is_Class_Wide_Type
(Ptyp
)
1061 and then Is_Interface
(Ptyp
)
1062 and then Tagged_Type_Expansion
1063 and then not (Nkind
(Pref
) in N_Has_Entity
1064 and then Is_Subprogram
(Entity
(Pref
)))
1067 Make_Function_Call
(Loc
,
1068 Name
=> New_Reference_To
(RTE
(RE_Base_Address
), Loc
),
1069 Parameter_Associations
=> New_List
(
1070 Relocate_Node
(N
))));
1075 -- Deal with packed array reference, other cases are handled by
1078 if Involves_Packed_Array_Reference
(Pref
) then
1079 Expand_Packed_Address_Reference
(N
);
1087 when Attribute_Alignment
=> Alignment
: declare
1091 -- For class-wide types, X'Class'Alignment is transformed into a
1092 -- direct reference to the Alignment of the class type, so that the
1093 -- back end does not have to deal with the X'Class'Alignment
1096 if Is_Entity_Name
(Pref
)
1097 and then Is_Class_Wide_Type
(Entity
(Pref
))
1099 Rewrite
(Prefix
(N
), New_Occurrence_Of
(Entity
(Pref
), Loc
));
1102 -- For x'Alignment applied to an object of a class wide type,
1103 -- transform X'Alignment into a call to the predefined primitive
1104 -- operation _Alignment applied to X.
1106 elsif Is_Class_Wide_Type
(Ptyp
) then
1108 -- No need to do anything else compiling under restriction
1109 -- No_Dispatching_Calls. During the semantic analysis we
1110 -- already notified such violation.
1112 if Restriction_Active
(No_Dispatching_Calls
) then
1117 Make_Function_Call
(Loc
,
1118 Name
=> New_Reference_To
1119 (Find_Prim_Op
(Ptyp
, Name_uAlignment
), Loc
),
1120 Parameter_Associations
=> New_List
(Pref
));
1122 if Typ
/= Standard_Integer
then
1124 -- The context is a specific integer type with which the
1125 -- original attribute was compatible. The function has a
1126 -- specific type as well, so to preserve the compatibility
1127 -- we must convert explicitly.
1129 New_Node
:= Convert_To
(Typ
, New_Node
);
1132 Rewrite
(N
, New_Node
);
1133 Analyze_And_Resolve
(N
, Typ
);
1136 -- For all other cases, we just have to deal with the case of
1137 -- the fact that the result can be universal.
1140 Apply_Universal_Integer_Attribute_Checks
(N
);
1148 when Attribute_AST_Entry
=> AST_Entry
: declare
1153 Entry_Ref
: Node_Id
;
1154 -- The reference to the entry or entry family
1157 -- The index expression for an entry family reference, or
1158 -- the Empty if Entry_Ref references a simple entry.
1161 if Nkind
(Pref
) = N_Indexed_Component
then
1162 Entry_Ref
:= Prefix
(Pref
);
1163 Index
:= First
(Expressions
(Pref
));
1169 -- Get expression for Task_Id and the entry entity
1171 if Nkind
(Entry_Ref
) = N_Selected_Component
then
1173 Make_Attribute_Reference
(Loc
,
1174 Attribute_Name
=> Name_Identity
,
1175 Prefix
=> Prefix
(Entry_Ref
));
1177 Ttyp
:= Etype
(Prefix
(Entry_Ref
));
1178 Eent
:= Entity
(Selector_Name
(Entry_Ref
));
1182 Make_Function_Call
(Loc
,
1183 Name
=> New_Occurrence_Of
(RTE
(RE_Current_Task
), Loc
));
1185 Eent
:= Entity
(Entry_Ref
);
1187 -- We have to find the enclosing task to get the task type
1188 -- There must be one, since we already validated this earlier
1190 Ttyp
:= Current_Scope
;
1191 while not Is_Task_Type
(Ttyp
) loop
1192 Ttyp
:= Scope
(Ttyp
);
1196 -- Now rewrite the attribute with a call to Create_AST_Handler
1199 Make_Function_Call
(Loc
,
1200 Name
=> New_Occurrence_Of
(RTE
(RE_Create_AST_Handler
), Loc
),
1201 Parameter_Associations
=> New_List
(
1203 Entry_Index_Expression
(Loc
, Eent
, Index
, Ttyp
))));
1205 Analyze_And_Resolve
(N
, RTE
(RE_AST_Handler
));
1212 -- We compute this if a packed array reference was present, otherwise we
1213 -- leave the computation up to the back end.
1215 when Attribute_Bit
=>
1216 if Involves_Packed_Array_Reference
(Pref
) then
1217 Expand_Packed_Bit_Reference
(N
);
1219 Apply_Universal_Integer_Attribute_Checks
(N
);
1226 -- We compute this if a component clause was present, otherwise we leave
1227 -- the computation up to the back end, since we don't know what layout
1230 -- Note that the attribute can apply to a naked record component
1231 -- in generated code (i.e. the prefix is an identifier that
1232 -- references the component or discriminant entity).
1234 when Attribute_Bit_Position
=> Bit_Position
: declare
1238 if Nkind
(Pref
) = N_Identifier
then
1239 CE
:= Entity
(Pref
);
1241 CE
:= Entity
(Selector_Name
(Pref
));
1244 if Known_Static_Component_Bit_Offset
(CE
) then
1246 Make_Integer_Literal
(Loc
,
1247 Intval
=> Component_Bit_Offset
(CE
)));
1248 Analyze_And_Resolve
(N
, Typ
);
1251 Apply_Universal_Integer_Attribute_Checks
(N
);
1259 -- A reference to P'Body_Version or P'Version is expanded to
1262 -- pragma Import (C, Vnn, "uuuuT");
1264 -- Get_Version_String (Vnn)
1266 -- where uuuu is the unit name (dots replaced by double underscore)
1267 -- and T is B for the cases of Body_Version, or Version applied to a
1268 -- subprogram acting as its own spec, and S for Version applied to a
1269 -- subprogram spec or package. This sequence of code references the
1270 -- the unsigned constant created in the main program by the binder.
1272 -- A special exception occurs for Standard, where the string returned
1273 -- is a copy of the library string in gnatvsn.ads.
1275 when Attribute_Body_Version | Attribute_Version
=> Version
: declare
1276 E
: constant Entity_Id
:= Make_Temporary
(Loc
, 'V');
1281 -- If not library unit, get to containing library unit
1283 Pent
:= Entity
(Pref
);
1284 while Pent
/= Standard_Standard
1285 and then Scope
(Pent
) /= Standard_Standard
1286 and then not Is_Child_Unit
(Pent
)
1288 Pent
:= Scope
(Pent
);
1291 -- Special case Standard and Standard.ASCII
1293 if Pent
= Standard_Standard
or else Pent
= Standard_ASCII
then
1295 Make_String_Literal
(Loc
,
1296 Strval
=> Verbose_Library_Version
));
1301 -- Build required string constant
1303 Get_Name_String
(Get_Unit_Name
(Pent
));
1306 for J
in 1 .. Name_Len
- 2 loop
1307 if Name_Buffer
(J
) = '.' then
1308 Store_String_Chars
("__");
1310 Store_String_Char
(Get_Char_Code
(Name_Buffer
(J
)));
1314 -- Case of subprogram acting as its own spec, always use body
1316 if Nkind
(Declaration_Node
(Pent
)) in N_Subprogram_Specification
1317 and then Nkind
(Parent
(Declaration_Node
(Pent
))) =
1319 and then Acts_As_Spec
(Parent
(Declaration_Node
(Pent
)))
1321 Store_String_Chars
("B");
1323 -- Case of no body present, always use spec
1325 elsif not Unit_Requires_Body
(Pent
) then
1326 Store_String_Chars
("S");
1328 -- Otherwise use B for Body_Version, S for spec
1330 elsif Id
= Attribute_Body_Version
then
1331 Store_String_Chars
("B");
1333 Store_String_Chars
("S");
1337 Lib
.Version_Referenced
(S
);
1339 -- Insert the object declaration
1341 Insert_Actions
(N
, New_List
(
1342 Make_Object_Declaration
(Loc
,
1343 Defining_Identifier
=> E
,
1344 Object_Definition
=>
1345 New_Occurrence_Of
(RTE
(RE_Unsigned
), Loc
))));
1347 -- Set entity as imported with correct external name
1349 Set_Is_Imported
(E
);
1350 Set_Interface_Name
(E
, Make_String_Literal
(Loc
, S
));
1352 -- Set entity as internal to ensure proper Sprint output of its
1353 -- implicit importation.
1355 Set_Is_Internal
(E
);
1357 -- And now rewrite original reference
1360 Make_Function_Call
(Loc
,
1361 Name
=> New_Reference_To
(RTE
(RE_Get_Version_String
), Loc
),
1362 Parameter_Associations
=> New_List
(
1363 New_Occurrence_Of
(E
, Loc
))));
1366 Analyze_And_Resolve
(N
, RTE
(RE_Version_String
));
1373 -- Transforms 'Ceiling into a call to the floating-point attribute
1374 -- function Ceiling in Fat_xxx (where xxx is the root type)
1376 when Attribute_Ceiling
=>
1377 Expand_Fpt_Attribute_R
(N
);
1383 -- Transforms 'Callable attribute into a call to the Callable function
1385 when Attribute_Callable
=> Callable
:
1387 -- We have an object of a task interface class-wide type as a prefix
1388 -- to Callable. Generate:
1389 -- callable (Task_Id (Pref._disp_get_task_id));
1391 if Ada_Version
>= Ada_05
1392 and then Ekind
(Ptyp
) = E_Class_Wide_Type
1393 and then Is_Interface
(Ptyp
)
1394 and then Is_Task_Interface
(Ptyp
)
1397 Make_Function_Call
(Loc
,
1399 New_Reference_To
(RTE
(RE_Callable
), Loc
),
1400 Parameter_Associations
=> New_List
(
1401 Make_Unchecked_Type_Conversion
(Loc
,
1403 New_Reference_To
(RTE
(RO_ST_Task_Id
), Loc
),
1405 Make_Selected_Component
(Loc
,
1407 New_Copy_Tree
(Pref
),
1409 Make_Identifier
(Loc
, Name_uDisp_Get_Task_Id
))))));
1413 Build_Call_With_Task
(Pref
, RTE
(RE_Callable
)));
1416 Analyze_And_Resolve
(N
, Standard_Boolean
);
1423 -- Transforms 'Caller attribute into a call to either the
1424 -- Task_Entry_Caller or the Protected_Entry_Caller function.
1426 when Attribute_Caller
=> Caller
: declare
1427 Id_Kind
: constant Entity_Id
:= RTE
(RO_AT_Task_Id
);
1428 Ent
: constant Entity_Id
:= Entity
(Pref
);
1429 Conctype
: constant Entity_Id
:= Scope
(Ent
);
1430 Nest_Depth
: Integer := 0;
1437 if Is_Protected_Type
(Conctype
) then
1438 case Corresponding_Runtime_Package
(Conctype
) is
1439 when System_Tasking_Protected_Objects_Entries
=>
1442 (RTE
(RE_Protected_Entry_Caller
), Loc
);
1444 when System_Tasking_Protected_Objects_Single_Entry
=>
1447 (RTE
(RE_Protected_Single_Entry_Caller
), Loc
);
1450 raise Program_Error
;
1454 Unchecked_Convert_To
(Id_Kind
,
1455 Make_Function_Call
(Loc
,
1457 Parameter_Associations
=> New_List
(
1459 (Find_Protection_Object
(Current_Scope
), Loc
)))));
1464 -- Determine the nesting depth of the E'Caller attribute, that
1465 -- is, how many accept statements are nested within the accept
1466 -- statement for E at the point of E'Caller. The runtime uses
1467 -- this depth to find the specified entry call.
1469 for J
in reverse 0 .. Scope_Stack
.Last
loop
1470 S
:= Scope_Stack
.Table
(J
).Entity
;
1472 -- We should not reach the scope of the entry, as it should
1473 -- already have been checked in Sem_Attr that this attribute
1474 -- reference is within a matching accept statement.
1476 pragma Assert
(S
/= Conctype
);
1481 elsif Is_Entry
(S
) then
1482 Nest_Depth
:= Nest_Depth
+ 1;
1487 Unchecked_Convert_To
(Id_Kind
,
1488 Make_Function_Call
(Loc
,
1490 New_Reference_To
(RTE
(RE_Task_Entry_Caller
), Loc
),
1491 Parameter_Associations
=> New_List
(
1492 Make_Integer_Literal
(Loc
,
1493 Intval
=> Int
(Nest_Depth
))))));
1496 Analyze_And_Resolve
(N
, Id_Kind
);
1503 -- Transforms 'Compose into a call to the floating-point attribute
1504 -- function Compose in Fat_xxx (where xxx is the root type)
1506 -- Note: we strictly should have special code here to deal with the
1507 -- case of absurdly negative arguments (less than Integer'First)
1508 -- which will return a (signed) zero value, but it hardly seems
1509 -- worth the effort. Absurdly large positive arguments will raise
1510 -- constraint error which is fine.
1512 when Attribute_Compose
=>
1513 Expand_Fpt_Attribute_RI
(N
);
1519 when Attribute_Constrained
=> Constrained
: declare
1520 Formal_Ent
: constant Entity_Id
:= Param_Entity
(Pref
);
1522 function Is_Constrained_Aliased_View
(Obj
: Node_Id
) return Boolean;
1523 -- Ada 2005 (AI-363): Returns True if the object name Obj denotes a
1524 -- view of an aliased object whose subtype is constrained.
1526 ---------------------------------
1527 -- Is_Constrained_Aliased_View --
1528 ---------------------------------
1530 function Is_Constrained_Aliased_View
(Obj
: Node_Id
) return Boolean is
1534 if Is_Entity_Name
(Obj
) then
1537 if Present
(Renamed_Object
(E
)) then
1538 return Is_Constrained_Aliased_View
(Renamed_Object
(E
));
1540 return Is_Aliased
(E
) and then Is_Constrained
(Etype
(E
));
1544 return Is_Aliased_View
(Obj
)
1546 (Is_Constrained
(Etype
(Obj
))
1547 or else (Nkind
(Obj
) = N_Explicit_Dereference
1549 not Has_Constrained_Partial_View
1550 (Base_Type
(Etype
(Obj
)))));
1552 end Is_Constrained_Aliased_View
;
1554 -- Start of processing for Constrained
1557 -- Reference to a parameter where the value is passed as an extra
1558 -- actual, corresponding to the extra formal referenced by the
1559 -- Extra_Constrained field of the corresponding formal. If this
1560 -- is an entry in-parameter, it is replaced by a constant renaming
1561 -- for which Extra_Constrained is never created.
1563 if Present
(Formal_Ent
)
1564 and then Ekind
(Formal_Ent
) /= E_Constant
1565 and then Present
(Extra_Constrained
(Formal_Ent
))
1569 (Extra_Constrained
(Formal_Ent
), Sloc
(N
)));
1571 -- For variables with a Extra_Constrained field, we use the
1572 -- corresponding entity.
1574 elsif Nkind
(Pref
) = N_Identifier
1575 and then Ekind
(Entity
(Pref
)) = E_Variable
1576 and then Present
(Extra_Constrained
(Entity
(Pref
)))
1580 (Extra_Constrained
(Entity
(Pref
)), Sloc
(N
)));
1582 -- For all other entity names, we can tell at compile time
1584 elsif Is_Entity_Name
(Pref
) then
1586 Ent
: constant Entity_Id
:= Entity
(Pref
);
1590 -- (RM J.4) obsolescent cases
1592 if Is_Type
(Ent
) then
1596 if Is_Private_Type
(Ent
) then
1597 Res
:= not Has_Discriminants
(Ent
)
1598 or else Is_Constrained
(Ent
);
1600 -- It not a private type, must be a generic actual type
1601 -- that corresponded to a private type. We know that this
1602 -- correspondence holds, since otherwise the reference
1603 -- within the generic template would have been illegal.
1606 if Is_Composite_Type
(Underlying_Type
(Ent
)) then
1607 Res
:= Is_Constrained
(Ent
);
1613 -- If the prefix is not a variable or is aliased, then
1614 -- definitely true; if it's a formal parameter without an
1615 -- associated extra formal, then treat it as constrained.
1617 -- Ada 2005 (AI-363): An aliased prefix must be known to be
1618 -- constrained in order to set the attribute to True.
1620 elsif not Is_Variable
(Pref
)
1621 or else Present
(Formal_Ent
)
1622 or else (Ada_Version
< Ada_05
1623 and then Is_Aliased_View
(Pref
))
1624 or else (Ada_Version
>= Ada_05
1625 and then Is_Constrained_Aliased_View
(Pref
))
1629 -- Variable case, look at type to see if it is constrained.
1630 -- Note that the one case where this is not accurate (the
1631 -- procedure formal case), has been handled above.
1633 -- We use the Underlying_Type here (and below) in case the
1634 -- type is private without discriminants, but the full type
1635 -- has discriminants. This case is illegal, but we generate it
1636 -- internally for passing to the Extra_Constrained parameter.
1639 Res
:= Is_Constrained
(Underlying_Type
(Etype
(Ent
)));
1643 New_Reference_To
(Boolean_Literals
(Res
), Loc
));
1646 -- Prefix is not an entity name. These are also cases where we can
1647 -- always tell at compile time by looking at the form and type of the
1648 -- prefix. If an explicit dereference of an object with constrained
1649 -- partial view, this is unconstrained (Ada 2005 AI-363).
1655 not Is_Variable
(Pref
)
1657 (Nkind
(Pref
) = N_Explicit_Dereference
1659 not Has_Constrained_Partial_View
(Base_Type
(Ptyp
)))
1660 or else Is_Constrained
(Underlying_Type
(Ptyp
))),
1664 Analyze_And_Resolve
(N
, Standard_Boolean
);
1671 -- Transforms 'Copy_Sign into a call to the floating-point attribute
1672 -- function Copy_Sign in Fat_xxx (where xxx is the root type)
1674 when Attribute_Copy_Sign
=>
1675 Expand_Fpt_Attribute_RR
(N
);
1681 -- Transforms 'Count attribute into a call to the Count function
1683 when Attribute_Count
=> Count
: declare
1685 Conctyp
: Entity_Id
;
1687 Entry_Id
: Entity_Id
;
1692 -- If the prefix is a member of an entry family, retrieve both
1693 -- entry name and index. For a simple entry there is no index.
1695 if Nkind
(Pref
) = N_Indexed_Component
then
1696 Entnam
:= Prefix
(Pref
);
1697 Index
:= First
(Expressions
(Pref
));
1703 Entry_Id
:= Entity
(Entnam
);
1705 -- Find the concurrent type in which this attribute is referenced
1706 -- (there had better be one).
1708 Conctyp
:= Current_Scope
;
1709 while not Is_Concurrent_Type
(Conctyp
) loop
1710 Conctyp
:= Scope
(Conctyp
);
1715 if Is_Protected_Type
(Conctyp
) then
1716 case Corresponding_Runtime_Package
(Conctyp
) is
1717 when System_Tasking_Protected_Objects_Entries
=>
1718 Name
:= New_Reference_To
(RTE
(RE_Protected_Count
), Loc
);
1721 Make_Function_Call
(Loc
,
1723 Parameter_Associations
=> New_List
(
1725 (Find_Protection_Object
(Current_Scope
), Loc
),
1726 Entry_Index_Expression
1727 (Loc
, Entry_Id
, Index
, Scope
(Entry_Id
))));
1729 when System_Tasking_Protected_Objects_Single_Entry
=>
1731 New_Reference_To
(RTE
(RE_Protected_Count_Entry
), Loc
);
1734 Make_Function_Call
(Loc
,
1736 Parameter_Associations
=> New_List
(
1738 (Find_Protection_Object
(Current_Scope
), Loc
)));
1741 raise Program_Error
;
1748 Make_Function_Call
(Loc
,
1749 Name
=> New_Reference_To
(RTE
(RE_Task_Count
), Loc
),
1750 Parameter_Associations
=> New_List
(
1751 Entry_Index_Expression
(Loc
,
1752 Entry_Id
, Index
, Scope
(Entry_Id
))));
1755 -- The call returns type Natural but the context is universal integer
1756 -- so any integer type is allowed. The attribute was already resolved
1757 -- so its Etype is the required result type. If the base type of the
1758 -- context type is other than Standard.Integer we put in a conversion
1759 -- to the required type. This can be a normal typed conversion since
1760 -- both input and output types of the conversion are integer types
1762 if Base_Type
(Typ
) /= Base_Type
(Standard_Integer
) then
1763 Rewrite
(N
, Convert_To
(Typ
, Call
));
1768 Analyze_And_Resolve
(N
, Typ
);
1775 -- This processing is shared by Elab_Spec
1777 -- What we do is to insert the following declarations
1780 -- pragma Import (C, enn, "name___elabb/s");
1782 -- and then the Elab_Body/Spec attribute is replaced by a reference
1783 -- to this defining identifier.
1785 when Attribute_Elab_Body |
1786 Attribute_Elab_Spec
=>
1789 Ent
: constant Entity_Id
:= Make_Temporary
(Loc
, 'E');
1793 procedure Make_Elab_String
(Nod
: Node_Id
);
1794 -- Given Nod, an identifier, or a selected component, put the
1795 -- image into the current string literal, with double underline
1796 -- between components.
1798 ----------------------
1799 -- Make_Elab_String --
1800 ----------------------
1802 procedure Make_Elab_String
(Nod
: Node_Id
) is
1804 if Nkind
(Nod
) = N_Selected_Component
then
1805 Make_Elab_String
(Prefix
(Nod
));
1809 Store_String_Char
('$');
1811 Store_String_Char
('.');
1813 Store_String_Char
('_');
1814 Store_String_Char
('_');
1817 Get_Name_String
(Chars
(Selector_Name
(Nod
)));
1820 pragma Assert
(Nkind
(Nod
) = N_Identifier
);
1821 Get_Name_String
(Chars
(Nod
));
1824 Store_String_Chars
(Name_Buffer
(1 .. Name_Len
));
1825 end Make_Elab_String
;
1827 -- Start of processing for Elab_Body/Elab_Spec
1830 -- First we need to prepare the string literal for the name of
1831 -- the elaboration routine to be referenced.
1834 Make_Elab_String
(Pref
);
1836 if VM_Target
= No_VM
then
1837 Store_String_Chars
("___elab");
1838 Lang
:= Make_Identifier
(Loc
, Name_C
);
1840 Store_String_Chars
("._elab");
1841 Lang
:= Make_Identifier
(Loc
, Name_Ada
);
1844 if Id
= Attribute_Elab_Body
then
1845 Store_String_Char
('b');
1847 Store_String_Char
('s');
1852 Insert_Actions
(N
, New_List
(
1853 Make_Subprogram_Declaration
(Loc
,
1855 Make_Procedure_Specification
(Loc
,
1856 Defining_Unit_Name
=> Ent
)),
1859 Chars
=> Name_Import
,
1860 Pragma_Argument_Associations
=> New_List
(
1861 Make_Pragma_Argument_Association
(Loc
,
1862 Expression
=> Lang
),
1864 Make_Pragma_Argument_Association
(Loc
,
1866 Make_Identifier
(Loc
, Chars
(Ent
))),
1868 Make_Pragma_Argument_Association
(Loc
,
1870 Make_String_Literal
(Loc
, Str
))))));
1872 Set_Entity
(N
, Ent
);
1873 Rewrite
(N
, New_Occurrence_Of
(Ent
, Loc
));
1880 -- Elaborated is always True for preelaborated units, predefined units,
1881 -- pure units and units which have Elaborate_Body pragmas. These units
1882 -- have no elaboration entity.
1884 -- Note: The Elaborated attribute is never passed to the back end
1886 when Attribute_Elaborated
=> Elaborated
: declare
1887 Ent
: constant Entity_Id
:= Entity
(Pref
);
1890 if Present
(Elaboration_Entity
(Ent
)) then
1892 New_Occurrence_Of
(Elaboration_Entity
(Ent
), Loc
));
1894 Rewrite
(N
, New_Occurrence_Of
(Standard_True
, Loc
));
1902 when Attribute_Enum_Rep
=> Enum_Rep
:
1904 -- X'Enum_Rep (Y) expands to
1908 -- This is simply a direct conversion from the enumeration type to
1909 -- the target integer type, which is treated by the back end as a
1910 -- normal integer conversion, treating the enumeration type as an
1911 -- integer, which is exactly what we want! We set Conversion_OK to
1912 -- make sure that the analyzer does not complain about what otherwise
1913 -- might be an illegal conversion.
1915 if Is_Non_Empty_List
(Exprs
) then
1917 OK_Convert_To
(Typ
, Relocate_Node
(First
(Exprs
))));
1919 -- X'Enum_Rep where X is an enumeration literal is replaced by
1920 -- the literal value.
1922 elsif Ekind
(Entity
(Pref
)) = E_Enumeration_Literal
then
1924 Make_Integer_Literal
(Loc
, Enumeration_Rep
(Entity
(Pref
))));
1926 -- If this is a renaming of a literal, recover the representation
1929 elsif Ekind
(Entity
(Pref
)) = E_Constant
1930 and then Present
(Renamed_Object
(Entity
(Pref
)))
1932 Ekind
(Entity
(Renamed_Object
(Entity
(Pref
))))
1933 = E_Enumeration_Literal
1936 Make_Integer_Literal
(Loc
,
1937 Enumeration_Rep
(Entity
(Renamed_Object
(Entity
(Pref
))))));
1939 -- X'Enum_Rep where X is an object does a direct unchecked conversion
1940 -- of the object value, as described for the type case above.
1944 OK_Convert_To
(Typ
, Relocate_Node
(Pref
)));
1948 Analyze_And_Resolve
(N
, Typ
);
1955 when Attribute_Enum_Val
=> Enum_Val
: declare
1957 Btyp
: constant Entity_Id
:= Base_Type
(Ptyp
);
1960 -- X'Enum_Val (Y) expands to
1962 -- [constraint_error when _rep_to_pos (Y, False) = -1, msg]
1965 Expr
:= Unchecked_Convert_To
(Ptyp
, First
(Exprs
));
1968 Make_Raise_Constraint_Error
(Loc
,
1972 Make_Function_Call
(Loc
,
1974 New_Reference_To
(TSS
(Btyp
, TSS_Rep_To_Pos
), Loc
),
1975 Parameter_Associations
=> New_List
(
1976 Relocate_Node
(Duplicate_Subexpr
(Expr
)),
1977 New_Occurrence_Of
(Standard_False
, Loc
))),
1979 Right_Opnd
=> Make_Integer_Literal
(Loc
, -1)),
1980 Reason
=> CE_Range_Check_Failed
));
1983 Analyze_And_Resolve
(N
, Ptyp
);
1990 -- Transforms 'Exponent into a call to the floating-point attribute
1991 -- function Exponent in Fat_xxx (where xxx is the root type)
1993 when Attribute_Exponent
=>
1994 Expand_Fpt_Attribute_R
(N
);
2000 -- transforme X'External_Tag into Ada.Tags.External_Tag (X'tag)
2002 when Attribute_External_Tag
=> External_Tag
:
2005 Make_Function_Call
(Loc
,
2006 Name
=> New_Reference_To
(RTE
(RE_External_Tag
), Loc
),
2007 Parameter_Associations
=> New_List
(
2008 Make_Attribute_Reference
(Loc
,
2009 Attribute_Name
=> Name_Tag
,
2010 Prefix
=> Prefix
(N
)))));
2012 Analyze_And_Resolve
(N
, Standard_String
);
2019 when Attribute_First
=>
2021 -- If the prefix type is a constrained packed array type which
2022 -- already has a Packed_Array_Type representation defined, then
2023 -- replace this attribute with a direct reference to 'First of the
2024 -- appropriate index subtype (since otherwise the back end will try
2025 -- to give us the value of 'First for this implementation type).
2027 if Is_Constrained_Packed_Array
(Ptyp
) then
2029 Make_Attribute_Reference
(Loc
,
2030 Attribute_Name
=> Name_First
,
2031 Prefix
=> New_Reference_To
(Get_Index_Subtype
(N
), Loc
)));
2032 Analyze_And_Resolve
(N
, Typ
);
2034 elsif Is_Access_Type
(Ptyp
) then
2035 Apply_Access_Check
(N
);
2042 -- Compute this if component clause was present, otherwise we leave the
2043 -- computation to be completed in the back-end, since we don't know what
2044 -- layout will be chosen.
2046 when Attribute_First_Bit
=> First_Bit
: declare
2047 CE
: constant Entity_Id
:= Entity
(Selector_Name
(Pref
));
2050 if Known_Static_Component_Bit_Offset
(CE
) then
2052 Make_Integer_Literal
(Loc
,
2053 Component_Bit_Offset
(CE
) mod System_Storage_Unit
));
2055 Analyze_And_Resolve
(N
, Typ
);
2058 Apply_Universal_Integer_Attribute_Checks
(N
);
2068 -- fixtype'Fixed_Value (integer-value)
2072 -- fixtype(integer-value)
2074 -- We do all the required analysis of the conversion here, because we do
2075 -- not want this to go through the fixed-point conversion circuits. Note
2076 -- that the back end always treats fixed-point as equivalent to the
2077 -- corresponding integer type anyway.
2079 when Attribute_Fixed_Value
=> Fixed_Value
:
2082 Make_Type_Conversion
(Loc
,
2083 Subtype_Mark
=> New_Occurrence_Of
(Entity
(Pref
), Loc
),
2084 Expression
=> Relocate_Node
(First
(Exprs
))));
2085 Set_Etype
(N
, Entity
(Pref
));
2088 -- Note: it might appear that a properly analyzed unchecked conversion
2089 -- would be just fine here, but that's not the case, since the full
2090 -- range checks performed by the following call are critical!
2092 Apply_Type_Conversion_Checks
(N
);
2099 -- Transforms 'Floor into a call to the floating-point attribute
2100 -- function Floor in Fat_xxx (where xxx is the root type)
2102 when Attribute_Floor
=>
2103 Expand_Fpt_Attribute_R
(N
);
2109 -- For the fixed-point type Typ:
2115 -- Result_Type (System.Fore (Universal_Real (Type'First)),
2116 -- Universal_Real (Type'Last))
2118 -- Note that we know that the type is a non-static subtype, or Fore
2119 -- would have itself been computed dynamically in Eval_Attribute.
2121 when Attribute_Fore
=> Fore
: begin
2124 Make_Function_Call
(Loc
,
2125 Name
=> New_Reference_To
(RTE
(RE_Fore
), Loc
),
2127 Parameter_Associations
=> New_List
(
2128 Convert_To
(Universal_Real
,
2129 Make_Attribute_Reference
(Loc
,
2130 Prefix
=> New_Reference_To
(Ptyp
, Loc
),
2131 Attribute_Name
=> Name_First
)),
2133 Convert_To
(Universal_Real
,
2134 Make_Attribute_Reference
(Loc
,
2135 Prefix
=> New_Reference_To
(Ptyp
, Loc
),
2136 Attribute_Name
=> Name_Last
))))));
2138 Analyze_And_Resolve
(N
, Typ
);
2145 -- Transforms 'Fraction into a call to the floating-point attribute
2146 -- function Fraction in Fat_xxx (where xxx is the root type)
2148 when Attribute_Fraction
=>
2149 Expand_Fpt_Attribute_R
(N
);
2155 when Attribute_From_Any
=> From_Any
: declare
2156 P_Type
: constant Entity_Id
:= Etype
(Pref
);
2157 Decls
: constant List_Id
:= New_List
;
2160 Build_From_Any_Call
(P_Type
,
2161 Relocate_Node
(First
(Exprs
)),
2163 Insert_Actions
(N
, Decls
);
2164 Analyze_And_Resolve
(N
, P_Type
);
2171 -- For an exception returns a reference to the exception data:
2172 -- Exception_Id!(Prefix'Reference)
2174 -- For a task it returns a reference to the _task_id component of
2175 -- corresponding record:
2177 -- taskV!(Prefix)._Task_Id, converted to the type Task_Id defined
2179 -- in Ada.Task_Identification
2181 when Attribute_Identity
=> Identity
: declare
2182 Id_Kind
: Entity_Id
;
2185 if Ptyp
= Standard_Exception_Type
then
2186 Id_Kind
:= RTE
(RE_Exception_Id
);
2188 if Present
(Renamed_Object
(Entity
(Pref
))) then
2189 Set_Entity
(Pref
, Renamed_Object
(Entity
(Pref
)));
2193 Unchecked_Convert_To
(Id_Kind
, Make_Reference
(Loc
, Pref
)));
2195 Id_Kind
:= RTE
(RO_AT_Task_Id
);
2197 -- If the prefix is a task interface, the Task_Id is obtained
2198 -- dynamically through a dispatching call, as for other task
2199 -- attributes applied to interfaces.
2201 if Ada_Version
>= Ada_05
2202 and then Ekind
(Ptyp
) = E_Class_Wide_Type
2203 and then Is_Interface
(Ptyp
)
2204 and then Is_Task_Interface
(Ptyp
)
2207 Unchecked_Convert_To
(Id_Kind
,
2208 Make_Selected_Component
(Loc
,
2210 New_Copy_Tree
(Pref
),
2212 Make_Identifier
(Loc
, Name_uDisp_Get_Task_Id
))));
2216 Unchecked_Convert_To
(Id_Kind
, Concurrent_Ref
(Pref
)));
2220 Analyze_And_Resolve
(N
, Id_Kind
);
2227 -- Image attribute is handled in separate unit Exp_Imgv
2229 when Attribute_Image
=>
2230 Exp_Imgv
.Expand_Image_Attribute
(N
);
2236 -- X'Img is expanded to typ'Image (X), where typ is the type of X
2238 when Attribute_Img
=> Img
:
2241 Make_Attribute_Reference
(Loc
,
2242 Prefix
=> New_Reference_To
(Ptyp
, Loc
),
2243 Attribute_Name
=> Name_Image
,
2244 Expressions
=> New_List
(Relocate_Node
(Pref
))));
2246 Analyze_And_Resolve
(N
, Standard_String
);
2253 when Attribute_Input
=> Input
: declare
2254 P_Type
: constant Entity_Id
:= Entity
(Pref
);
2255 B_Type
: constant Entity_Id
:= Base_Type
(P_Type
);
2256 U_Type
: constant Entity_Id
:= Underlying_Type
(P_Type
);
2257 Strm
: constant Node_Id
:= First
(Exprs
);
2265 Cntrl
: Node_Id
:= Empty
;
2266 -- Value for controlling argument in call. Always Empty except in
2267 -- the dispatching (class-wide type) case, where it is a reference
2268 -- to the dummy object initialized to the right internal tag.
2270 procedure Freeze_Stream_Subprogram
(F
: Entity_Id
);
2271 -- The expansion of the attribute reference may generate a call to
2272 -- a user-defined stream subprogram that is frozen by the call. This
2273 -- can lead to access-before-elaboration problem if the reference
2274 -- appears in an object declaration and the subprogram body has not
2275 -- been seen. The freezing of the subprogram requires special code
2276 -- because it appears in an expanded context where expressions do
2277 -- not freeze their constituents.
2279 ------------------------------
2280 -- Freeze_Stream_Subprogram --
2281 ------------------------------
2283 procedure Freeze_Stream_Subprogram
(F
: Entity_Id
) is
2284 Decl
: constant Node_Id
:= Unit_Declaration_Node
(F
);
2288 -- If this is user-defined subprogram, the corresponding
2289 -- stream function appears as a renaming-as-body, and the
2290 -- user subprogram must be retrieved by tree traversal.
2293 and then Nkind
(Decl
) = N_Subprogram_Declaration
2294 and then Present
(Corresponding_Body
(Decl
))
2296 Bod
:= Corresponding_Body
(Decl
);
2298 if Nkind
(Unit_Declaration_Node
(Bod
)) =
2299 N_Subprogram_Renaming_Declaration
2301 Set_Is_Frozen
(Entity
(Name
(Unit_Declaration_Node
(Bod
))));
2304 end Freeze_Stream_Subprogram
;
2306 -- Start of processing for Input
2309 -- If no underlying type, we have an error that will be diagnosed
2310 -- elsewhere, so here we just completely ignore the expansion.
2316 -- If there is a TSS for Input, just call it
2318 Fname
:= Find_Stream_Subprogram
(P_Type
, TSS_Stream_Input
);
2320 if Present
(Fname
) then
2324 -- If there is a Stream_Convert pragma, use it, we rewrite
2326 -- sourcetyp'Input (stream)
2330 -- sourcetyp (streamread (strmtyp'Input (stream)));
2332 -- where streamread is the given Read function that converts an
2333 -- argument of type strmtyp to type sourcetyp or a type from which
2334 -- it is derived (extra conversion required for the derived case).
2336 Prag
:= Get_Stream_Convert_Pragma
(P_Type
);
2338 if Present
(Prag
) then
2339 Arg2
:= Next
(First
(Pragma_Argument_Associations
(Prag
)));
2340 Rfunc
:= Entity
(Expression
(Arg2
));
2344 Make_Function_Call
(Loc
,
2345 Name
=> New_Occurrence_Of
(Rfunc
, Loc
),
2346 Parameter_Associations
=> New_List
(
2347 Make_Attribute_Reference
(Loc
,
2350 (Etype
(First_Formal
(Rfunc
)), Loc
),
2351 Attribute_Name
=> Name_Input
,
2352 Expressions
=> Exprs
)))));
2354 Analyze_And_Resolve
(N
, B_Type
);
2359 elsif Is_Elementary_Type
(U_Type
) then
2361 -- A special case arises if we have a defined _Read routine,
2362 -- since in this case we are required to call this routine.
2364 if Present
(TSS
(Base_Type
(U_Type
), TSS_Stream_Read
)) then
2365 Build_Record_Or_Elementary_Input_Function
2366 (Loc
, U_Type
, Decl
, Fname
);
2367 Insert_Action
(N
, Decl
);
2369 -- For normal cases, we call the I_xxx routine directly
2372 Rewrite
(N
, Build_Elementary_Input_Call
(N
));
2373 Analyze_And_Resolve
(N
, P_Type
);
2379 elsif Is_Array_Type
(U_Type
) then
2380 Build_Array_Input_Function
(Loc
, U_Type
, Decl
, Fname
);
2381 Compile_Stream_Body_In_Scope
(N
, Decl
, U_Type
, Check
=> False);
2383 -- Dispatching case with class-wide type
2385 elsif Is_Class_Wide_Type
(P_Type
) then
2387 -- No need to do anything else compiling under restriction
2388 -- No_Dispatching_Calls. During the semantic analysis we
2389 -- already notified such violation.
2391 if Restriction_Active
(No_Dispatching_Calls
) then
2396 Rtyp
: constant Entity_Id
:= Root_Type
(P_Type
);
2402 -- Read the internal tag (RM 13.13.2(34)) and use it to
2403 -- initialize a dummy tag object:
2405 -- Dnn : Ada.Tags.Tag :=
2406 -- Descendant_Tag (String'Input (Strm), P_Type);
2408 -- This dummy object is used only to provide a controlling
2409 -- argument for the eventual _Input call. Descendant_Tag is
2410 -- called rather than Internal_Tag to ensure that we have a
2411 -- tag for a type that is descended from the prefix type and
2412 -- declared at the same accessibility level (the exception
2413 -- Tag_Error will be raised otherwise). The level check is
2414 -- required for Ada 2005 because tagged types can be
2415 -- extended in nested scopes (AI-344).
2418 Make_Function_Call
(Loc
,
2420 New_Occurrence_Of
(RTE
(RE_Descendant_Tag
), Loc
),
2421 Parameter_Associations
=> New_List
(
2422 Make_Attribute_Reference
(Loc
,
2423 Prefix
=> New_Occurrence_Of
(Standard_String
, Loc
),
2424 Attribute_Name
=> Name_Input
,
2425 Expressions
=> New_List
(
2426 Relocate_Node
(Duplicate_Subexpr
(Strm
)))),
2427 Make_Attribute_Reference
(Loc
,
2428 Prefix
=> New_Reference_To
(P_Type
, Loc
),
2429 Attribute_Name
=> Name_Tag
)));
2431 Dnn
:= Make_Temporary
(Loc
, 'D', Expr
);
2434 Make_Object_Declaration
(Loc
,
2435 Defining_Identifier
=> Dnn
,
2436 Object_Definition
=>
2437 New_Occurrence_Of
(RTE
(RE_Tag
), Loc
),
2438 Expression
=> Expr
);
2440 Insert_Action
(N
, Decl
);
2442 -- Now we need to get the entity for the call, and construct
2443 -- a function call node, where we preset a reference to Dnn
2444 -- as the controlling argument (doing an unchecked convert
2445 -- to the class-wide tagged type to make it look like a real
2448 Fname
:= Find_Prim_Op
(Rtyp
, TSS_Stream_Input
);
2450 Unchecked_Convert_To
(P_Type
,
2451 New_Occurrence_Of
(Dnn
, Loc
));
2452 Set_Etype
(Cntrl
, P_Type
);
2453 Set_Parent
(Cntrl
, N
);
2456 -- For tagged types, use the primitive Input function
2458 elsif Is_Tagged_Type
(U_Type
) then
2459 Fname
:= Find_Prim_Op
(U_Type
, TSS_Stream_Input
);
2461 -- All other record type cases, including protected records. The
2462 -- latter only arise for expander generated code for handling
2463 -- shared passive partition access.
2467 (Is_Record_Type
(U_Type
) or else Is_Protected_Type
(U_Type
));
2469 -- Ada 2005 (AI-216): Program_Error is raised executing default
2470 -- implementation of the Input attribute of an unchecked union
2471 -- type if the type lacks default discriminant values.
2473 if Is_Unchecked_Union
(Base_Type
(U_Type
))
2474 and then No
(Discriminant_Constraint
(U_Type
))
2477 Make_Raise_Program_Error
(Loc
,
2478 Reason
=> PE_Unchecked_Union_Restriction
));
2483 Build_Record_Or_Elementary_Input_Function
2484 (Loc
, Base_Type
(U_Type
), Decl
, Fname
);
2485 Insert_Action
(N
, Decl
);
2487 if Nkind
(Parent
(N
)) = N_Object_Declaration
2488 and then Is_Record_Type
(U_Type
)
2490 -- The stream function may contain calls to user-defined
2491 -- Read procedures for individual components.
2498 Comp
:= First_Component
(U_Type
);
2499 while Present
(Comp
) loop
2501 Find_Stream_Subprogram
2502 (Etype
(Comp
), TSS_Stream_Read
);
2504 if Present
(Func
) then
2505 Freeze_Stream_Subprogram
(Func
);
2508 Next_Component
(Comp
);
2515 -- If we fall through, Fname is the function to be called. The result
2516 -- is obtained by calling the appropriate function, then converting
2517 -- the result. The conversion does a subtype check.
2520 Make_Function_Call
(Loc
,
2521 Name
=> New_Occurrence_Of
(Fname
, Loc
),
2522 Parameter_Associations
=> New_List
(
2523 Relocate_Node
(Strm
)));
2525 Set_Controlling_Argument
(Call
, Cntrl
);
2526 Rewrite
(N
, Unchecked_Convert_To
(P_Type
, Call
));
2527 Analyze_And_Resolve
(N
, P_Type
);
2529 if Nkind
(Parent
(N
)) = N_Object_Declaration
then
2530 Freeze_Stream_Subprogram
(Fname
);
2540 -- inttype'Fixed_Value (fixed-value)
2544 -- inttype(integer-value))
2546 -- we do all the required analysis of the conversion here, because we do
2547 -- not want this to go through the fixed-point conversion circuits. Note
2548 -- that the back end always treats fixed-point as equivalent to the
2549 -- corresponding integer type anyway.
2551 when Attribute_Integer_Value
=> Integer_Value
:
2554 Make_Type_Conversion
(Loc
,
2555 Subtype_Mark
=> New_Occurrence_Of
(Entity
(Pref
), Loc
),
2556 Expression
=> Relocate_Node
(First
(Exprs
))));
2557 Set_Etype
(N
, Entity
(Pref
));
2560 -- Note: it might appear that a properly analyzed unchecked conversion
2561 -- would be just fine here, but that's not the case, since the full
2562 -- range checks performed by the following call are critical!
2564 Apply_Type_Conversion_Checks
(N
);
2571 when Attribute_Invalid_Value
=>
2572 Rewrite
(N
, Get_Simple_Init_Val
(Ptyp
, N
));
2578 when Attribute_Last
=>
2580 -- If the prefix type is a constrained packed array type which
2581 -- already has a Packed_Array_Type representation defined, then
2582 -- replace this attribute with a direct reference to 'Last of the
2583 -- appropriate index subtype (since otherwise the back end will try
2584 -- to give us the value of 'Last for this implementation type).
2586 if Is_Constrained_Packed_Array
(Ptyp
) then
2588 Make_Attribute_Reference
(Loc
,
2589 Attribute_Name
=> Name_Last
,
2590 Prefix
=> New_Reference_To
(Get_Index_Subtype
(N
), Loc
)));
2591 Analyze_And_Resolve
(N
, Typ
);
2593 elsif Is_Access_Type
(Ptyp
) then
2594 Apply_Access_Check
(N
);
2601 -- We compute this if a component clause was present, otherwise we leave
2602 -- the computation up to the back end, since we don't know what layout
2605 when Attribute_Last_Bit
=> Last_Bit
: declare
2606 CE
: constant Entity_Id
:= Entity
(Selector_Name
(Pref
));
2609 if Known_Static_Component_Bit_Offset
(CE
)
2610 and then Known_Static_Esize
(CE
)
2613 Make_Integer_Literal
(Loc
,
2614 Intval
=> (Component_Bit_Offset
(CE
) mod System_Storage_Unit
)
2617 Analyze_And_Resolve
(N
, Typ
);
2620 Apply_Universal_Integer_Attribute_Checks
(N
);
2628 -- Transforms 'Leading_Part into a call to the floating-point attribute
2629 -- function Leading_Part in Fat_xxx (where xxx is the root type)
2631 -- Note: strictly, we should generate special case code to deal with
2632 -- absurdly large positive arguments (greater than Integer'Last), which
2633 -- result in returning the first argument unchanged, but it hardly seems
2634 -- worth the effort. We raise constraint error for absurdly negative
2635 -- arguments which is fine.
2637 when Attribute_Leading_Part
=>
2638 Expand_Fpt_Attribute_RI
(N
);
2644 when Attribute_Length
=> declare
2649 -- Processing for packed array types
2651 if Is_Array_Type
(Ptyp
) and then Is_Packed
(Ptyp
) then
2652 Ityp
:= Get_Index_Subtype
(N
);
2654 -- If the index type, Ityp, is an enumeration type with holes,
2655 -- then we calculate X'Length explicitly using
2658 -- (0, Ityp'Pos (X'Last (N)) -
2659 -- Ityp'Pos (X'First (N)) + 1);
2661 -- Since the bounds in the template are the representation values
2662 -- and the back end would get the wrong value.
2664 if Is_Enumeration_Type
(Ityp
)
2665 and then Present
(Enum_Pos_To_Rep
(Base_Type
(Ityp
)))
2670 Xnum
:= Expr_Value
(First
(Expressions
(N
)));
2674 Make_Attribute_Reference
(Loc
,
2675 Prefix
=> New_Occurrence_Of
(Typ
, Loc
),
2676 Attribute_Name
=> Name_Max
,
2677 Expressions
=> New_List
2678 (Make_Integer_Literal
(Loc
, 0),
2682 Make_Op_Subtract
(Loc
,
2684 Make_Attribute_Reference
(Loc
,
2685 Prefix
=> New_Occurrence_Of
(Ityp
, Loc
),
2686 Attribute_Name
=> Name_Pos
,
2688 Expressions
=> New_List
(
2689 Make_Attribute_Reference
(Loc
,
2690 Prefix
=> Duplicate_Subexpr
(Pref
),
2691 Attribute_Name
=> Name_Last
,
2692 Expressions
=> New_List
(
2693 Make_Integer_Literal
(Loc
, Xnum
))))),
2696 Make_Attribute_Reference
(Loc
,
2697 Prefix
=> New_Occurrence_Of
(Ityp
, Loc
),
2698 Attribute_Name
=> Name_Pos
,
2700 Expressions
=> New_List
(
2701 Make_Attribute_Reference
(Loc
,
2703 Duplicate_Subexpr_No_Checks
(Pref
),
2704 Attribute_Name
=> Name_First
,
2705 Expressions
=> New_List
(
2706 Make_Integer_Literal
(Loc
, Xnum
)))))),
2708 Right_Opnd
=> Make_Integer_Literal
(Loc
, 1)))));
2710 Analyze_And_Resolve
(N
, Typ
, Suppress
=> All_Checks
);
2713 -- If the prefix type is a constrained packed array type which
2714 -- already has a Packed_Array_Type representation defined, then
2715 -- replace this attribute with a direct reference to 'Range_Length
2716 -- of the appropriate index subtype (since otherwise the back end
2717 -- will try to give us the value of 'Length for this
2718 -- implementation type).
2720 elsif Is_Constrained
(Ptyp
) then
2722 Make_Attribute_Reference
(Loc
,
2723 Attribute_Name
=> Name_Range_Length
,
2724 Prefix
=> New_Reference_To
(Ityp
, Loc
)));
2725 Analyze_And_Resolve
(N
, Typ
);
2730 elsif Is_Access_Type
(Ptyp
) then
2731 Apply_Access_Check
(N
);
2733 -- If the designated type is a packed array type, then we convert
2734 -- the reference to:
2737 -- xtyp'Pos (Pref'Last (Expr)) -
2738 -- xtyp'Pos (Pref'First (Expr)));
2740 -- This is a bit complex, but it is the easiest thing to do that
2741 -- works in all cases including enum types with holes xtyp here
2742 -- is the appropriate index type.
2745 Dtyp
: constant Entity_Id
:= Designated_Type
(Ptyp
);
2749 if Is_Array_Type
(Dtyp
) and then Is_Packed
(Dtyp
) then
2750 Xtyp
:= Get_Index_Subtype
(N
);
2753 Make_Attribute_Reference
(Loc
,
2754 Prefix
=> New_Occurrence_Of
(Typ
, Loc
),
2755 Attribute_Name
=> Name_Max
,
2756 Expressions
=> New_List
(
2757 Make_Integer_Literal
(Loc
, 0),
2760 Make_Integer_Literal
(Loc
, 1),
2761 Make_Op_Subtract
(Loc
,
2763 Make_Attribute_Reference
(Loc
,
2764 Prefix
=> New_Occurrence_Of
(Xtyp
, Loc
),
2765 Attribute_Name
=> Name_Pos
,
2766 Expressions
=> New_List
(
2767 Make_Attribute_Reference
(Loc
,
2768 Prefix
=> Duplicate_Subexpr
(Pref
),
2769 Attribute_Name
=> Name_Last
,
2771 New_Copy_List
(Exprs
)))),
2774 Make_Attribute_Reference
(Loc
,
2775 Prefix
=> New_Occurrence_Of
(Xtyp
, Loc
),
2776 Attribute_Name
=> Name_Pos
,
2777 Expressions
=> New_List
(
2778 Make_Attribute_Reference
(Loc
,
2780 Duplicate_Subexpr_No_Checks
(Pref
),
2781 Attribute_Name
=> Name_First
,
2783 New_Copy_List
(Exprs
)))))))));
2785 Analyze_And_Resolve
(N
, Typ
);
2789 -- Otherwise leave it to the back end
2792 Apply_Universal_Integer_Attribute_Checks
(N
);
2800 -- Transforms 'Machine into a call to the floating-point attribute
2801 -- function Machine in Fat_xxx (where xxx is the root type)
2803 when Attribute_Machine
=>
2804 Expand_Fpt_Attribute_R
(N
);
2806 ----------------------
2807 -- Machine_Rounding --
2808 ----------------------
2810 -- Transforms 'Machine_Rounding into a call to the floating-point
2811 -- attribute function Machine_Rounding in Fat_xxx (where xxx is the root
2812 -- type). Expansion is avoided for cases the back end can handle
2815 when Attribute_Machine_Rounding
=>
2816 if not Is_Inline_Floating_Point_Attribute
(N
) then
2817 Expand_Fpt_Attribute_R
(N
);
2824 -- Machine_Size is equivalent to Object_Size, so transform it into
2825 -- Object_Size and that way the back end never sees Machine_Size.
2827 when Attribute_Machine_Size
=>
2829 Make_Attribute_Reference
(Loc
,
2830 Prefix
=> Prefix
(N
),
2831 Attribute_Name
=> Name_Object_Size
));
2833 Analyze_And_Resolve
(N
, Typ
);
2839 -- The only case that can get this far is the dynamic case of the old
2840 -- Ada 83 Mantissa attribute for the fixed-point case. For this case,
2847 -- ityp (System.Mantissa.Mantissa_Value
2848 -- (Integer'Integer_Value (typ'First),
2849 -- Integer'Integer_Value (typ'Last)));
2851 when Attribute_Mantissa
=> Mantissa
: begin
2854 Make_Function_Call
(Loc
,
2855 Name
=> New_Occurrence_Of
(RTE
(RE_Mantissa_Value
), Loc
),
2857 Parameter_Associations
=> New_List
(
2859 Make_Attribute_Reference
(Loc
,
2860 Prefix
=> New_Occurrence_Of
(Standard_Integer
, Loc
),
2861 Attribute_Name
=> Name_Integer_Value
,
2862 Expressions
=> New_List
(
2864 Make_Attribute_Reference
(Loc
,
2865 Prefix
=> New_Occurrence_Of
(Ptyp
, Loc
),
2866 Attribute_Name
=> Name_First
))),
2868 Make_Attribute_Reference
(Loc
,
2869 Prefix
=> New_Occurrence_Of
(Standard_Integer
, Loc
),
2870 Attribute_Name
=> Name_Integer_Value
,
2871 Expressions
=> New_List
(
2873 Make_Attribute_Reference
(Loc
,
2874 Prefix
=> New_Occurrence_Of
(Ptyp
, Loc
),
2875 Attribute_Name
=> Name_Last
)))))));
2877 Analyze_And_Resolve
(N
, Typ
);
2880 --------------------
2881 -- Mechanism_Code --
2882 --------------------
2884 when Attribute_Mechanism_Code
=>
2886 -- We must replace the prefix in the renamed case
2888 if Is_Entity_Name
(Pref
)
2889 and then Present
(Alias
(Entity
(Pref
)))
2891 Set_Renamed_Subprogram
(Pref
, Alias
(Entity
(Pref
)));
2898 when Attribute_Mod
=> Mod_Case
: declare
2899 Arg
: constant Node_Id
:= Relocate_Node
(First
(Exprs
));
2900 Hi
: constant Node_Id
:= Type_High_Bound
(Etype
(Arg
));
2901 Modv
: constant Uint
:= Modulus
(Btyp
);
2905 -- This is not so simple. The issue is what type to use for the
2906 -- computation of the modular value.
2908 -- The easy case is when the modulus value is within the bounds
2909 -- of the signed integer type of the argument. In this case we can
2910 -- just do the computation in that signed integer type, and then
2911 -- do an ordinary conversion to the target type.
2913 if Modv
<= Expr_Value
(Hi
) then
2918 Right_Opnd
=> Make_Integer_Literal
(Loc
, Modv
))));
2920 -- Here we know that the modulus is larger than type'Last of the
2921 -- integer type. There are two cases to consider:
2923 -- a) The integer value is non-negative. In this case, it is
2924 -- returned as the result (since it is less than the modulus).
2926 -- b) The integer value is negative. In this case, we know that the
2927 -- result is modulus + value, where the value might be as small as
2928 -- -modulus. The trouble is what type do we use to do the subtract.
2929 -- No type will do, since modulus can be as big as 2**64, and no
2930 -- integer type accommodates this value. Let's do bit of algebra
2933 -- = modulus - (-value)
2934 -- = (modulus - 1) - (-value - 1)
2936 -- Now modulus - 1 is certainly in range of the modular type.
2937 -- -value is in the range 1 .. modulus, so -value -1 is in the
2938 -- range 0 .. modulus-1 which is in range of the modular type.
2939 -- Furthermore, (-value - 1) can be expressed as -(value + 1)
2940 -- which we can compute using the integer base type.
2942 -- Once this is done we analyze the conditional expression without
2943 -- range checks, because we know everything is in range, and we
2944 -- want to prevent spurious warnings on either branch.
2948 Make_Conditional_Expression
(Loc
,
2949 Expressions
=> New_List
(
2951 Left_Opnd
=> Duplicate_Subexpr
(Arg
),
2952 Right_Opnd
=> Make_Integer_Literal
(Loc
, 0)),
2955 Duplicate_Subexpr_No_Checks
(Arg
)),
2957 Make_Op_Subtract
(Loc
,
2959 Make_Integer_Literal
(Loc
,
2960 Intval
=> Modv
- 1),
2966 Left_Opnd
=> Duplicate_Subexpr_No_Checks
(Arg
),
2968 Make_Integer_Literal
(Loc
,
2969 Intval
=> 1))))))));
2973 Analyze_And_Resolve
(N
, Btyp
, Suppress
=> All_Checks
);
2980 -- Transforms 'Model into a call to the floating-point attribute
2981 -- function Model in Fat_xxx (where xxx is the root type)
2983 when Attribute_Model
=>
2984 Expand_Fpt_Attribute_R
(N
);
2990 -- The processing for Object_Size shares the processing for Size
2996 when Attribute_Old
=> Old
: declare
2997 Tnn
: constant Entity_Id
:= Make_Temporary
(Loc
, 'T', Pref
);
3002 -- Find the nearest subprogram body, ignoring _Preconditions
3006 Subp
:= Parent
(Subp
);
3007 exit when Nkind
(Subp
) = N_Subprogram_Body
3008 and then Chars
(Defining_Entity
(Subp
)) /= Name_uPostconditions
;
3011 -- Insert the assignment at the start of the declarations
3014 Make_Object_Declaration
(Loc
,
3015 Defining_Identifier
=> Tnn
,
3016 Constant_Present
=> True,
3017 Object_Definition
=> New_Occurrence_Of
(Etype
(N
), Loc
),
3018 Expression
=> Pref
);
3020 if Is_Empty_List
(Declarations
(Subp
)) then
3021 Set_Declarations
(Subp
, New_List
(Asn_Stm
));
3024 Insert_Action
(First
(Declarations
(Subp
)), Asn_Stm
);
3027 Rewrite
(N
, New_Occurrence_Of
(Tnn
, Loc
));
3034 when Attribute_Output
=> Output
: declare
3035 P_Type
: constant Entity_Id
:= Entity
(Pref
);
3036 U_Type
: constant Entity_Id
:= Underlying_Type
(P_Type
);
3044 -- If no underlying type, we have an error that will be diagnosed
3045 -- elsewhere, so here we just completely ignore the expansion.
3051 -- If TSS for Output is present, just call it
3053 Pname
:= Find_Stream_Subprogram
(P_Type
, TSS_Stream_Output
);
3055 if Present
(Pname
) then
3059 -- If there is a Stream_Convert pragma, use it, we rewrite
3061 -- sourcetyp'Output (stream, Item)
3065 -- strmtyp'Output (Stream, strmwrite (acttyp (Item)));
3067 -- where strmwrite is the given Write function that converts an
3068 -- argument of type sourcetyp or a type acctyp, from which it is
3069 -- derived to type strmtyp. The conversion to acttyp is required
3070 -- for the derived case.
3072 Prag
:= Get_Stream_Convert_Pragma
(P_Type
);
3074 if Present
(Prag
) then
3076 Next
(Next
(First
(Pragma_Argument_Associations
(Prag
))));
3077 Wfunc
:= Entity
(Expression
(Arg3
));
3080 Make_Attribute_Reference
(Loc
,
3081 Prefix
=> New_Occurrence_Of
(Etype
(Wfunc
), Loc
),
3082 Attribute_Name
=> Name_Output
,
3083 Expressions
=> New_List
(
3084 Relocate_Node
(First
(Exprs
)),
3085 Make_Function_Call
(Loc
,
3086 Name
=> New_Occurrence_Of
(Wfunc
, Loc
),
3087 Parameter_Associations
=> New_List
(
3088 OK_Convert_To
(Etype
(First_Formal
(Wfunc
)),
3089 Relocate_Node
(Next
(First
(Exprs
)))))))));
3094 -- For elementary types, we call the W_xxx routine directly.
3095 -- Note that the effect of Write and Output is identical for
3096 -- the case of an elementary type, since there are no
3097 -- discriminants or bounds.
3099 elsif Is_Elementary_Type
(U_Type
) then
3101 -- A special case arises if we have a defined _Write routine,
3102 -- since in this case we are required to call this routine.
3104 if Present
(TSS
(Base_Type
(U_Type
), TSS_Stream_Write
)) then
3105 Build_Record_Or_Elementary_Output_Procedure
3106 (Loc
, U_Type
, Decl
, Pname
);
3107 Insert_Action
(N
, Decl
);
3109 -- For normal cases, we call the W_xxx routine directly
3112 Rewrite
(N
, Build_Elementary_Write_Call
(N
));
3119 elsif Is_Array_Type
(U_Type
) then
3120 Build_Array_Output_Procedure
(Loc
, U_Type
, Decl
, Pname
);
3121 Compile_Stream_Body_In_Scope
(N
, Decl
, U_Type
, Check
=> False);
3123 -- Class-wide case, first output external tag, then dispatch
3124 -- to the appropriate primitive Output function (RM 13.13.2(31)).
3126 elsif Is_Class_Wide_Type
(P_Type
) then
3128 -- No need to do anything else compiling under restriction
3129 -- No_Dispatching_Calls. During the semantic analysis we
3130 -- already notified such violation.
3132 if Restriction_Active
(No_Dispatching_Calls
) then
3137 Strm
: constant Node_Id
:= First
(Exprs
);
3138 Item
: constant Node_Id
:= Next
(Strm
);
3141 -- Ada 2005 (AI-344): Check that the accessibility level
3142 -- of the type of the output object is not deeper than
3143 -- that of the attribute's prefix type.
3145 -- if Get_Access_Level (Item'Tag)
3146 -- /= Get_Access_Level (P_Type'Tag)
3151 -- String'Output (Strm, External_Tag (Item'Tag));
3153 -- We cannot figure out a practical way to implement this
3154 -- accessibility check on virtual machines, so we omit it.
3156 if Ada_Version
>= Ada_05
3157 and then Tagged_Type_Expansion
3160 Make_Implicit_If_Statement
(N
,
3164 Build_Get_Access_Level
(Loc
,
3165 Make_Attribute_Reference
(Loc
,
3168 Duplicate_Subexpr
(Item
,
3170 Attribute_Name
=> Name_Tag
)),
3173 Make_Integer_Literal
(Loc
,
3174 Type_Access_Level
(P_Type
))),
3177 New_List
(Make_Raise_Statement
(Loc
,
3179 RTE
(RE_Tag_Error
), Loc
)))));
3183 Make_Attribute_Reference
(Loc
,
3184 Prefix
=> New_Occurrence_Of
(Standard_String
, Loc
),
3185 Attribute_Name
=> Name_Output
,
3186 Expressions
=> New_List
(
3187 Relocate_Node
(Duplicate_Subexpr
(Strm
)),
3188 Make_Function_Call
(Loc
,
3190 New_Occurrence_Of
(RTE
(RE_External_Tag
), Loc
),
3191 Parameter_Associations
=> New_List
(
3192 Make_Attribute_Reference
(Loc
,
3195 (Duplicate_Subexpr
(Item
, Name_Req
=> True)),
3196 Attribute_Name
=> Name_Tag
))))));
3199 Pname
:= Find_Prim_Op
(U_Type
, TSS_Stream_Output
);
3201 -- Tagged type case, use the primitive Output function
3203 elsif Is_Tagged_Type
(U_Type
) then
3204 Pname
:= Find_Prim_Op
(U_Type
, TSS_Stream_Output
);
3206 -- All other record type cases, including protected records.
3207 -- The latter only arise for expander generated code for
3208 -- handling shared passive partition access.
3212 (Is_Record_Type
(U_Type
) or else Is_Protected_Type
(U_Type
));
3214 -- Ada 2005 (AI-216): Program_Error is raised when executing
3215 -- the default implementation of the Output attribute of an
3216 -- unchecked union type if the type lacks default discriminant
3219 if Is_Unchecked_Union
(Base_Type
(U_Type
))
3220 and then No
(Discriminant_Constraint
(U_Type
))
3223 Make_Raise_Program_Error
(Loc
,
3224 Reason
=> PE_Unchecked_Union_Restriction
));
3229 Build_Record_Or_Elementary_Output_Procedure
3230 (Loc
, Base_Type
(U_Type
), Decl
, Pname
);
3231 Insert_Action
(N
, Decl
);
3235 -- If we fall through, Pname is the name of the procedure to call
3237 Rewrite_Stream_Proc_Call
(Pname
);
3244 -- For enumeration types with a standard representation, Pos is
3245 -- handled by the back end.
3247 -- For enumeration types, with a non-standard representation we generate
3248 -- a call to the _Rep_To_Pos function created when the type was frozen.
3249 -- The call has the form
3251 -- _rep_to_pos (expr, flag)
3253 -- The parameter flag is True if range checks are enabled, causing
3254 -- Program_Error to be raised if the expression has an invalid
3255 -- representation, and False if range checks are suppressed.
3257 -- For integer types, Pos is equivalent to a simple integer
3258 -- conversion and we rewrite it as such
3260 when Attribute_Pos
=> Pos
:
3262 Etyp
: Entity_Id
:= Base_Type
(Entity
(Pref
));
3265 -- Deal with zero/non-zero boolean values
3267 if Is_Boolean_Type
(Etyp
) then
3268 Adjust_Condition
(First
(Exprs
));
3269 Etyp
:= Standard_Boolean
;
3270 Set_Prefix
(N
, New_Occurrence_Of
(Standard_Boolean
, Loc
));
3273 -- Case of enumeration type
3275 if Is_Enumeration_Type
(Etyp
) then
3277 -- Non-standard enumeration type (generate call)
3279 if Present
(Enum_Pos_To_Rep
(Etyp
)) then
3280 Append_To
(Exprs
, Rep_To_Pos_Flag
(Etyp
, Loc
));
3283 Make_Function_Call
(Loc
,
3285 New_Reference_To
(TSS
(Etyp
, TSS_Rep_To_Pos
), Loc
),
3286 Parameter_Associations
=> Exprs
)));
3288 Analyze_And_Resolve
(N
, Typ
);
3290 -- Standard enumeration type (do universal integer check)
3293 Apply_Universal_Integer_Attribute_Checks
(N
);
3296 -- Deal with integer types (replace by conversion)
3298 elsif Is_Integer_Type
(Etyp
) then
3299 Rewrite
(N
, Convert_To
(Typ
, First
(Exprs
)));
3300 Analyze_And_Resolve
(N
, Typ
);
3309 -- We compute this if a component clause was present, otherwise we leave
3310 -- the computation up to the back end, since we don't know what layout
3313 when Attribute_Position
=> Position
:
3315 CE
: constant Entity_Id
:= Entity
(Selector_Name
(Pref
));
3318 if Present
(Component_Clause
(CE
)) then
3320 Make_Integer_Literal
(Loc
,
3321 Intval
=> Component_Bit_Offset
(CE
) / System_Storage_Unit
));
3322 Analyze_And_Resolve
(N
, Typ
);
3325 Apply_Universal_Integer_Attribute_Checks
(N
);
3333 -- 1. Deal with enumeration types with holes
3334 -- 2. For floating-point, generate call to attribute function
3335 -- 3. For other cases, deal with constraint checking
3337 when Attribute_Pred
=> Pred
:
3339 Etyp
: constant Entity_Id
:= Base_Type
(Ptyp
);
3343 -- For enumeration types with non-standard representations, we
3344 -- expand typ'Pred (x) into
3346 -- Pos_To_Rep (Rep_To_Pos (x) - 1)
3348 -- If the representation is contiguous, we compute instead
3349 -- Lit1 + Rep_to_Pos (x -1), to catch invalid representations.
3350 -- The conversion function Enum_Pos_To_Rep is defined on the
3351 -- base type, not the subtype, so we have to use the base type
3352 -- explicitly for this and other enumeration attributes.
3354 if Is_Enumeration_Type
(Ptyp
)
3355 and then Present
(Enum_Pos_To_Rep
(Etyp
))
3357 if Has_Contiguous_Rep
(Etyp
) then
3359 Unchecked_Convert_To
(Ptyp
,
3362 Make_Integer_Literal
(Loc
,
3363 Enumeration_Rep
(First_Literal
(Ptyp
))),
3365 Make_Function_Call
(Loc
,
3368 (TSS
(Etyp
, TSS_Rep_To_Pos
), Loc
),
3370 Parameter_Associations
=>
3372 Unchecked_Convert_To
(Ptyp
,
3373 Make_Op_Subtract
(Loc
,
3375 Unchecked_Convert_To
(Standard_Integer
,
3376 Relocate_Node
(First
(Exprs
))),
3378 Make_Integer_Literal
(Loc
, 1))),
3379 Rep_To_Pos_Flag
(Ptyp
, Loc
))))));
3382 -- Add Boolean parameter True, to request program errror if
3383 -- we have a bad representation on our hands. If checks are
3384 -- suppressed, then add False instead
3386 Append_To
(Exprs
, Rep_To_Pos_Flag
(Ptyp
, Loc
));
3388 Make_Indexed_Component
(Loc
,
3391 (Enum_Pos_To_Rep
(Etyp
), Loc
),
3392 Expressions
=> New_List
(
3393 Make_Op_Subtract
(Loc
,
3395 Make_Function_Call
(Loc
,
3398 (TSS
(Etyp
, TSS_Rep_To_Pos
), Loc
),
3399 Parameter_Associations
=> Exprs
),
3400 Right_Opnd
=> Make_Integer_Literal
(Loc
, 1)))));
3403 Analyze_And_Resolve
(N
, Typ
);
3405 -- For floating-point, we transform 'Pred into a call to the Pred
3406 -- floating-point attribute function in Fat_xxx (xxx is root type)
3408 elsif Is_Floating_Point_Type
(Ptyp
) then
3409 Expand_Fpt_Attribute_R
(N
);
3410 Analyze_And_Resolve
(N
, Typ
);
3412 -- For modular types, nothing to do (no overflow, since wraps)
3414 elsif Is_Modular_Integer_Type
(Ptyp
) then
3417 -- For other types, if argument is marked as needing a range check or
3418 -- overflow checking is enabled, we must generate a check.
3420 elsif not Overflow_Checks_Suppressed
(Ptyp
)
3421 or else Do_Range_Check
(First
(Exprs
))
3423 Set_Do_Range_Check
(First
(Exprs
), False);
3424 Expand_Pred_Succ
(N
);
3432 -- Ada 2005 (AI-327): Dynamic ceiling priorities
3434 -- We rewrite X'Priority as the following run-time call:
3436 -- Get_Ceiling (X._Object)
3438 -- Note that although X'Priority is notionally an object, it is quite
3439 -- deliberately not defined as an aliased object in the RM. This means
3440 -- that it works fine to rewrite it as a call, without having to worry
3441 -- about complications that would other arise from X'Priority'Access,
3442 -- which is illegal, because of the lack of aliasing.
3444 when Attribute_Priority
=>
3447 Conctyp
: Entity_Id
;
3448 Object_Parm
: Node_Id
;
3450 RT_Subprg_Name
: Node_Id
;
3453 -- Look for the enclosing concurrent type
3455 Conctyp
:= Current_Scope
;
3456 while not Is_Concurrent_Type
(Conctyp
) loop
3457 Conctyp
:= Scope
(Conctyp
);
3460 pragma Assert
(Is_Protected_Type
(Conctyp
));
3462 -- Generate the actual of the call
3464 Subprg
:= Current_Scope
;
3465 while not Present
(Protected_Body_Subprogram
(Subprg
)) loop
3466 Subprg
:= Scope
(Subprg
);
3469 -- Use of 'Priority inside protected entries and barriers (in
3470 -- both cases the type of the first formal of their expanded
3471 -- subprogram is Address)
3473 if Etype
(First_Entity
(Protected_Body_Subprogram
(Subprg
)))
3477 New_Itype
: Entity_Id
;
3480 -- In the expansion of protected entries the type of the
3481 -- first formal of the Protected_Body_Subprogram is an
3482 -- Address. In order to reference the _object component
3485 -- type T is access p__ptTV;
3488 New_Itype
:= Create_Itype
(E_Access_Type
, N
);
3489 Set_Etype
(New_Itype
, New_Itype
);
3490 Set_Directly_Designated_Type
(New_Itype
,
3491 Corresponding_Record_Type
(Conctyp
));
3492 Freeze_Itype
(New_Itype
, N
);
3495 -- T!(O)._object'unchecked_access
3498 Make_Attribute_Reference
(Loc
,
3500 Make_Selected_Component
(Loc
,
3502 Unchecked_Convert_To
(New_Itype
,
3505 (Protected_Body_Subprogram
(Subprg
)),
3508 Make_Identifier
(Loc
, Name_uObject
)),
3509 Attribute_Name
=> Name_Unchecked_Access
);
3512 -- Use of 'Priority inside a protected subprogram
3516 Make_Attribute_Reference
(Loc
,
3518 Make_Selected_Component
(Loc
,
3519 Prefix
=> New_Reference_To
3521 (Protected_Body_Subprogram
(Subprg
)),
3524 Make_Identifier
(Loc
, Name_uObject
)),
3525 Attribute_Name
=> Name_Unchecked_Access
);
3528 -- Select the appropriate run-time subprogram
3530 if Number_Entries
(Conctyp
) = 0 then
3532 New_Reference_To
(RTE
(RE_Get_Ceiling
), Loc
);
3535 New_Reference_To
(RTE
(RO_PE_Get_Ceiling
), Loc
);
3539 Make_Function_Call
(Loc
,
3540 Name
=> RT_Subprg_Name
,
3541 Parameter_Associations
=> New_List
(Object_Parm
));
3545 -- Avoid the generation of extra checks on the pointer to the
3546 -- protected object.
3548 Analyze_And_Resolve
(N
, Typ
, Suppress
=> Access_Check
);
3555 when Attribute_Range_Length
=> Range_Length
: begin
3557 -- The only special processing required is for the case where
3558 -- Range_Length is applied to an enumeration type with holes.
3559 -- In this case we transform
3565 -- X'Pos (X'Last) - X'Pos (X'First) + 1
3567 -- So that the result reflects the proper Pos values instead
3568 -- of the underlying representations.
3570 if Is_Enumeration_Type
(Ptyp
)
3571 and then Has_Non_Standard_Rep
(Ptyp
)
3576 Make_Op_Subtract
(Loc
,
3578 Make_Attribute_Reference
(Loc
,
3579 Attribute_Name
=> Name_Pos
,
3580 Prefix
=> New_Occurrence_Of
(Ptyp
, Loc
),
3581 Expressions
=> New_List
(
3582 Make_Attribute_Reference
(Loc
,
3583 Attribute_Name
=> Name_Last
,
3584 Prefix
=> New_Occurrence_Of
(Ptyp
, Loc
)))),
3587 Make_Attribute_Reference
(Loc
,
3588 Attribute_Name
=> Name_Pos
,
3589 Prefix
=> New_Occurrence_Of
(Ptyp
, Loc
),
3590 Expressions
=> New_List
(
3591 Make_Attribute_Reference
(Loc
,
3592 Attribute_Name
=> Name_First
,
3593 Prefix
=> New_Occurrence_Of
(Ptyp
, Loc
))))),
3595 Right_Opnd
=> Make_Integer_Literal
(Loc
, 1)));
3597 Analyze_And_Resolve
(N
, Typ
);
3599 -- For all other cases, the attribute is handled by the back end, but
3600 -- we need to deal with the case of the range check on a universal
3604 Apply_Universal_Integer_Attribute_Checks
(N
);
3612 when Attribute_Read
=> Read
: declare
3613 P_Type
: constant Entity_Id
:= Entity
(Pref
);
3614 B_Type
: constant Entity_Id
:= Base_Type
(P_Type
);
3615 U_Type
: constant Entity_Id
:= Underlying_Type
(P_Type
);
3625 -- If no underlying type, we have an error that will be diagnosed
3626 -- elsewhere, so here we just completely ignore the expansion.
3632 -- The simple case, if there is a TSS for Read, just call it
3634 Pname
:= Find_Stream_Subprogram
(P_Type
, TSS_Stream_Read
);
3636 if Present
(Pname
) then
3640 -- If there is a Stream_Convert pragma, use it, we rewrite
3642 -- sourcetyp'Read (stream, Item)
3646 -- Item := sourcetyp (strmread (strmtyp'Input (Stream)));
3648 -- where strmread is the given Read function that converts an
3649 -- argument of type strmtyp to type sourcetyp or a type from which
3650 -- it is derived. The conversion to sourcetyp is required in the
3653 -- A special case arises if Item is a type conversion in which
3654 -- case, we have to expand to:
3656 -- Itemx := typex (strmread (strmtyp'Input (Stream)));
3658 -- where Itemx is the expression of the type conversion (i.e.
3659 -- the actual object), and typex is the type of Itemx.
3661 Prag
:= Get_Stream_Convert_Pragma
(P_Type
);
3663 if Present
(Prag
) then
3664 Arg2
:= Next
(First
(Pragma_Argument_Associations
(Prag
)));
3665 Rfunc
:= Entity
(Expression
(Arg2
));
3666 Lhs
:= Relocate_Node
(Next
(First
(Exprs
)));
3668 OK_Convert_To
(B_Type
,
3669 Make_Function_Call
(Loc
,
3670 Name
=> New_Occurrence_Of
(Rfunc
, Loc
),
3671 Parameter_Associations
=> New_List
(
3672 Make_Attribute_Reference
(Loc
,
3675 (Etype
(First_Formal
(Rfunc
)), Loc
),
3676 Attribute_Name
=> Name_Input
,
3677 Expressions
=> New_List
(
3678 Relocate_Node
(First
(Exprs
)))))));
3680 if Nkind
(Lhs
) = N_Type_Conversion
then
3681 Lhs
:= Expression
(Lhs
);
3682 Rhs
:= Convert_To
(Etype
(Lhs
), Rhs
);
3686 Make_Assignment_Statement
(Loc
,
3688 Expression
=> Rhs
));
3689 Set_Assignment_OK
(Lhs
);
3693 -- For elementary types, we call the I_xxx routine using the first
3694 -- parameter and then assign the result into the second parameter.
3695 -- We set Assignment_OK to deal with the conversion case.
3697 elsif Is_Elementary_Type
(U_Type
) then
3703 Lhs
:= Relocate_Node
(Next
(First
(Exprs
)));
3704 Rhs
:= Build_Elementary_Input_Call
(N
);
3706 if Nkind
(Lhs
) = N_Type_Conversion
then
3707 Lhs
:= Expression
(Lhs
);
3708 Rhs
:= Convert_To
(Etype
(Lhs
), Rhs
);
3711 Set_Assignment_OK
(Lhs
);
3714 Make_Assignment_Statement
(Loc
,
3716 Expression
=> Rhs
));
3724 elsif Is_Array_Type
(U_Type
) then
3725 Build_Array_Read_Procedure
(N
, U_Type
, Decl
, Pname
);
3726 Compile_Stream_Body_In_Scope
(N
, Decl
, U_Type
, Check
=> False);
3728 -- Tagged type case, use the primitive Read function. Note that
3729 -- this will dispatch in the class-wide case which is what we want
3731 elsif Is_Tagged_Type
(U_Type
) then
3732 Pname
:= Find_Prim_Op
(U_Type
, TSS_Stream_Read
);
3734 -- All other record type cases, including protected records. The
3735 -- latter only arise for expander generated code for handling
3736 -- shared passive partition access.
3740 (Is_Record_Type
(U_Type
) or else Is_Protected_Type
(U_Type
));
3742 -- Ada 2005 (AI-216): Program_Error is raised when executing
3743 -- the default implementation of the Read attribute of an
3744 -- Unchecked_Union type.
3746 if Is_Unchecked_Union
(Base_Type
(U_Type
)) then
3748 Make_Raise_Program_Error
(Loc
,
3749 Reason
=> PE_Unchecked_Union_Restriction
));
3752 if Has_Discriminants
(U_Type
)
3754 (Discriminant_Default_Value
(First_Discriminant
(U_Type
)))
3756 Build_Mutable_Record_Read_Procedure
3757 (Loc
, Base_Type
(U_Type
), Decl
, Pname
);
3759 Build_Record_Read_Procedure
3760 (Loc
, Base_Type
(U_Type
), Decl
, Pname
);
3763 -- Suppress checks, uninitialized or otherwise invalid
3764 -- data does not cause constraint errors to be raised for
3765 -- a complete record read.
3767 Insert_Action
(N
, Decl
, All_Checks
);
3771 Rewrite_Stream_Proc_Call
(Pname
);
3778 -- Transforms 'Remainder into a call to the floating-point attribute
3779 -- function Remainder in Fat_xxx (where xxx is the root type)
3781 when Attribute_Remainder
=>
3782 Expand_Fpt_Attribute_RR
(N
);
3788 -- Transform 'Result into reference to _Result formal. At the point
3789 -- where a legal 'Result attribute is expanded, we know that we are in
3790 -- the context of a _Postcondition function with a _Result parameter.
3792 when Attribute_Result
=>
3793 Rewrite
(N
, Make_Identifier
(Loc
, Chars
=> Name_uResult
));
3794 Analyze_And_Resolve
(N
, Typ
);
3800 -- The handling of the Round attribute is quite delicate. The processing
3801 -- in Sem_Attr introduced a conversion to universal real, reflecting the
3802 -- semantics of Round, but we do not want anything to do with universal
3803 -- real at runtime, since this corresponds to using floating-point
3806 -- What we have now is that the Etype of the Round attribute correctly
3807 -- indicates the final result type. The operand of the Round is the
3808 -- conversion to universal real, described above, and the operand of
3809 -- this conversion is the actual operand of Round, which may be the
3810 -- special case of a fixed point multiplication or division (Etype =
3813 -- The exapander will expand first the operand of the conversion, then
3814 -- the conversion, and finally the round attribute itself, since we
3815 -- always work inside out. But we cannot simply process naively in this
3816 -- order. In the semantic world where universal fixed and real really
3817 -- exist and have infinite precision, there is no problem, but in the
3818 -- implementation world, where universal real is a floating-point type,
3819 -- we would get the wrong result.
3821 -- So the approach is as follows. First, when expanding a multiply or
3822 -- divide whose type is universal fixed, we do nothing at all, instead
3823 -- deferring the operation till later.
3825 -- The actual processing is done in Expand_N_Type_Conversion which
3826 -- handles the special case of Round by looking at its parent to see if
3827 -- it is a Round attribute, and if it is, handling the conversion (or
3828 -- its fixed multiply/divide child) in an appropriate manner.
3830 -- This means that by the time we get to expanding the Round attribute
3831 -- itself, the Round is nothing more than a type conversion (and will
3832 -- often be a null type conversion), so we just replace it with the
3833 -- appropriate conversion operation.
3835 when Attribute_Round
=>
3837 Convert_To
(Etype
(N
), Relocate_Node
(First
(Exprs
))));
3838 Analyze_And_Resolve
(N
);
3844 -- Transforms 'Rounding into a call to the floating-point attribute
3845 -- function Rounding in Fat_xxx (where xxx is the root type)
3847 when Attribute_Rounding
=>
3848 Expand_Fpt_Attribute_R
(N
);
3854 -- Transforms 'Scaling into a call to the floating-point attribute
3855 -- function Scaling in Fat_xxx (where xxx is the root type)
3857 when Attribute_Scaling
=>
3858 Expand_Fpt_Attribute_RI
(N
);
3864 when Attribute_Size |
3865 Attribute_Object_Size |
3866 Attribute_Value_Size |
3867 Attribute_VADS_Size
=> Size
:
3874 -- Processing for VADS_Size case. Note that this processing removes
3875 -- all traces of VADS_Size from the tree, and completes all required
3876 -- processing for VADS_Size by translating the attribute reference
3877 -- to an appropriate Size or Object_Size reference.
3879 if Id
= Attribute_VADS_Size
3880 or else (Use_VADS_Size
and then Id
= Attribute_Size
)
3882 -- If the size is specified, then we simply use the specified
3883 -- size. This applies to both types and objects. The size of an
3884 -- object can be specified in the following ways:
3886 -- An explicit size object is given for an object
3887 -- A component size is specified for an indexed component
3888 -- A component clause is specified for a selected component
3889 -- The object is a component of a packed composite object
3891 -- If the size is specified, then VADS_Size of an object
3893 if (Is_Entity_Name
(Pref
)
3894 and then Present
(Size_Clause
(Entity
(Pref
))))
3896 (Nkind
(Pref
) = N_Component_Clause
3897 and then (Present
(Component_Clause
3898 (Entity
(Selector_Name
(Pref
))))
3899 or else Is_Packed
(Etype
(Prefix
(Pref
)))))
3901 (Nkind
(Pref
) = N_Indexed_Component
3902 and then (Component_Size
(Etype
(Prefix
(Pref
))) /= 0
3903 or else Is_Packed
(Etype
(Prefix
(Pref
)))))
3905 Set_Attribute_Name
(N
, Name_Size
);
3907 -- Otherwise if we have an object rather than a type, then the
3908 -- VADS_Size attribute applies to the type of the object, rather
3909 -- than the object itself. This is one of the respects in which
3910 -- VADS_Size differs from Size.
3913 if (not Is_Entity_Name
(Pref
)
3914 or else not Is_Type
(Entity
(Pref
)))
3915 and then (Is_Scalar_Type
(Ptyp
) or else Is_Constrained
(Ptyp
))
3917 Rewrite
(Pref
, New_Occurrence_Of
(Ptyp
, Loc
));
3920 -- For a scalar type for which no size was explicitly given,
3921 -- VADS_Size means Object_Size. This is the other respect in
3922 -- which VADS_Size differs from Size.
3924 if Is_Scalar_Type
(Ptyp
) and then No
(Size_Clause
(Ptyp
)) then
3925 Set_Attribute_Name
(N
, Name_Object_Size
);
3927 -- In all other cases, Size and VADS_Size are the sane
3930 Set_Attribute_Name
(N
, Name_Size
);
3935 -- For class-wide types, X'Class'Size is transformed into a direct
3936 -- reference to the Size of the class type, so that the back end does
3937 -- not have to deal with the X'Class'Size reference.
3939 if Is_Entity_Name
(Pref
)
3940 and then Is_Class_Wide_Type
(Entity
(Pref
))
3942 Rewrite
(Prefix
(N
), New_Occurrence_Of
(Entity
(Pref
), Loc
));
3945 -- For X'Size applied to an object of a class-wide type, transform
3946 -- X'Size into a call to the primitive operation _Size applied to X.
3948 elsif Is_Class_Wide_Type
(Ptyp
)
3949 or else (Id
= Attribute_Size
3950 and then Is_Tagged_Type
(Ptyp
)
3951 and then Has_Unknown_Discriminants
(Ptyp
))
3953 -- No need to do anything else compiling under restriction
3954 -- No_Dispatching_Calls. During the semantic analysis we
3955 -- already notified such violation.
3957 if Restriction_Active
(No_Dispatching_Calls
) then
3962 Make_Function_Call
(Loc
,
3963 Name
=> New_Reference_To
3964 (Find_Prim_Op
(Ptyp
, Name_uSize
), Loc
),
3965 Parameter_Associations
=> New_List
(Pref
));
3967 if Typ
/= Standard_Long_Long_Integer
then
3969 -- The context is a specific integer type with which the
3970 -- original attribute was compatible. The function has a
3971 -- specific type as well, so to preserve the compatibility
3972 -- we must convert explicitly.
3974 New_Node
:= Convert_To
(Typ
, New_Node
);
3977 Rewrite
(N
, New_Node
);
3978 Analyze_And_Resolve
(N
, Typ
);
3981 -- Case of known RM_Size of a type
3983 elsif (Id
= Attribute_Size
or else Id
= Attribute_Value_Size
)
3984 and then Is_Entity_Name
(Pref
)
3985 and then Is_Type
(Entity
(Pref
))
3986 and then Known_Static_RM_Size
(Entity
(Pref
))
3988 Siz
:= RM_Size
(Entity
(Pref
));
3990 -- Case of known Esize of a type
3992 elsif Id
= Attribute_Object_Size
3993 and then Is_Entity_Name
(Pref
)
3994 and then Is_Type
(Entity
(Pref
))
3995 and then Known_Static_Esize
(Entity
(Pref
))
3997 Siz
:= Esize
(Entity
(Pref
));
3999 -- Case of known size of object
4001 elsif Id
= Attribute_Size
4002 and then Is_Entity_Name
(Pref
)
4003 and then Is_Object
(Entity
(Pref
))
4004 and then Known_Esize
(Entity
(Pref
))
4005 and then Known_Static_Esize
(Entity
(Pref
))
4007 Siz
:= Esize
(Entity
(Pref
));
4009 -- For an array component, we can do Size in the front end
4010 -- if the component_size of the array is set.
4012 elsif Nkind
(Pref
) = N_Indexed_Component
then
4013 Siz
:= Component_Size
(Etype
(Prefix
(Pref
)));
4015 -- For a record component, we can do Size in the front end if there
4016 -- is a component clause, or if the record is packed and the
4017 -- component's size is known at compile time.
4019 elsif Nkind
(Pref
) = N_Selected_Component
then
4021 Rec
: constant Entity_Id
:= Etype
(Prefix
(Pref
));
4022 Comp
: constant Entity_Id
:= Entity
(Selector_Name
(Pref
));
4025 if Present
(Component_Clause
(Comp
)) then
4026 Siz
:= Esize
(Comp
);
4028 elsif Is_Packed
(Rec
) then
4029 Siz
:= RM_Size
(Ptyp
);
4032 Apply_Universal_Integer_Attribute_Checks
(N
);
4037 -- All other cases are handled by the back end
4040 Apply_Universal_Integer_Attribute_Checks
(N
);
4042 -- If Size is applied to a formal parameter that is of a packed
4043 -- array subtype, then apply Size to the actual subtype.
4045 if Is_Entity_Name
(Pref
)
4046 and then Is_Formal
(Entity
(Pref
))
4047 and then Is_Array_Type
(Ptyp
)
4048 and then Is_Packed
(Ptyp
)
4051 Make_Attribute_Reference
(Loc
,
4053 New_Occurrence_Of
(Get_Actual_Subtype
(Pref
), Loc
),
4054 Attribute_Name
=> Name_Size
));
4055 Analyze_And_Resolve
(N
, Typ
);
4058 -- If Size applies to a dereference of an access to unconstrained
4059 -- packed array, the back end needs to see its unconstrained
4060 -- nominal type, but also a hint to the actual constrained type.
4062 if Nkind
(Pref
) = N_Explicit_Dereference
4063 and then Is_Array_Type
(Ptyp
)
4064 and then not Is_Constrained
(Ptyp
)
4065 and then Is_Packed
(Ptyp
)
4067 Set_Actual_Designated_Subtype
(Pref
,
4068 Get_Actual_Subtype
(Pref
));
4074 -- Common processing for record and array component case
4076 if Siz
/= No_Uint
and then Siz
/= 0 then
4078 CS
: constant Boolean := Comes_From_Source
(N
);
4081 Rewrite
(N
, Make_Integer_Literal
(Loc
, Siz
));
4083 -- This integer literal is not a static expression. We do not
4084 -- call Analyze_And_Resolve here, because this would activate
4085 -- the circuit for deciding that a static value was out of
4086 -- range, and we don't want that.
4088 -- So just manually set the type, mark the expression as non-
4089 -- static, and then ensure that the result is checked properly
4090 -- if the attribute comes from source (if it was internally
4091 -- generated, we never need a constraint check).
4094 Set_Is_Static_Expression
(N
, False);
4097 Apply_Constraint_Check
(N
, Typ
);
4107 when Attribute_Storage_Pool
=>
4109 Make_Type_Conversion
(Loc
,
4110 Subtype_Mark
=> New_Reference_To
(Etype
(N
), Loc
),
4111 Expression
=> New_Reference_To
(Entity
(N
), Loc
)));
4112 Analyze_And_Resolve
(N
, Typ
);
4118 when Attribute_Storage_Size
=> Storage_Size
: begin
4120 -- Access type case, always go to the root type
4122 -- The case of access types results in a value of zero for the case
4123 -- where no storage size attribute clause has been given. If a
4124 -- storage size has been given, then the attribute is converted
4125 -- to a reference to the variable used to hold this value.
4127 if Is_Access_Type
(Ptyp
) then
4128 if Present
(Storage_Size_Variable
(Root_Type
(Ptyp
))) then
4130 Make_Attribute_Reference
(Loc
,
4131 Prefix
=> New_Reference_To
(Typ
, Loc
),
4132 Attribute_Name
=> Name_Max
,
4133 Expressions
=> New_List
(
4134 Make_Integer_Literal
(Loc
, 0),
4137 (Storage_Size_Variable
(Root_Type
(Ptyp
)), Loc
)))));
4139 elsif Present
(Associated_Storage_Pool
(Root_Type
(Ptyp
))) then
4142 Make_Function_Call
(Loc
,
4146 (Etype
(Associated_Storage_Pool
(Root_Type
(Ptyp
))),
4147 Attribute_Name
(N
)),
4150 Parameter_Associations
=> New_List
(
4152 (Associated_Storage_Pool
(Root_Type
(Ptyp
)), Loc
)))));
4155 Rewrite
(N
, Make_Integer_Literal
(Loc
, 0));
4158 Analyze_And_Resolve
(N
, Typ
);
4160 -- For tasks, we retrieve the size directly from the TCB. The
4161 -- size may depend on a discriminant of the type, and therefore
4162 -- can be a per-object expression, so type-level information is
4163 -- not sufficient in general. There are four cases to consider:
4165 -- a) If the attribute appears within a task body, the designated
4166 -- TCB is obtained by a call to Self.
4168 -- b) If the prefix of the attribute is the name of a task object,
4169 -- the designated TCB is the one stored in the corresponding record.
4171 -- c) If the prefix is a task type, the size is obtained from the
4172 -- size variable created for each task type
4174 -- d) If no storage_size was specified for the type , there is no
4175 -- size variable, and the value is a system-specific default.
4178 if In_Open_Scopes
(Ptyp
) then
4180 -- Storage_Size (Self)
4184 Make_Function_Call
(Loc
,
4186 New_Occurrence_Of
(RTE
(RE_Storage_Size
), Loc
),
4187 Parameter_Associations
=>
4189 Make_Function_Call
(Loc
,
4191 New_Reference_To
(RTE
(RE_Self
), Loc
))))));
4193 elsif not Is_Entity_Name
(Pref
)
4194 or else not Is_Type
(Entity
(Pref
))
4196 -- Storage_Size (Rec (Obj).Size)
4200 Make_Function_Call
(Loc
,
4202 New_Occurrence_Of
(RTE
(RE_Storage_Size
), Loc
),
4203 Parameter_Associations
=>
4205 Make_Selected_Component
(Loc
,
4207 Unchecked_Convert_To
(
4208 Corresponding_Record_Type
(Ptyp
),
4209 New_Copy_Tree
(Pref
)),
4211 Make_Identifier
(Loc
, Name_uTask_Id
))))));
4213 elsif Present
(Storage_Size_Variable
(Ptyp
)) then
4215 -- Static storage size pragma given for type: retrieve value
4216 -- from its allocated storage variable.
4220 Make_Function_Call
(Loc
,
4221 Name
=> New_Occurrence_Of
(
4222 RTE
(RE_Adjust_Storage_Size
), Loc
),
4223 Parameter_Associations
=>
4226 Storage_Size_Variable
(Ptyp
), Loc
)))));
4228 -- Get system default
4232 Make_Function_Call
(Loc
,
4235 RTE
(RE_Default_Stack_Size
), Loc
))));
4238 Analyze_And_Resolve
(N
, Typ
);
4246 when Attribute_Stream_Size
=> Stream_Size
: declare
4250 -- If we have a Stream_Size clause for this type use it, otherwise
4251 -- the Stream_Size if the size of the type.
4253 if Has_Stream_Size_Clause
(Ptyp
) then
4256 (Static_Integer
(Expression
(Stream_Size_Clause
(Ptyp
))));
4258 Size
:= UI_To_Int
(Esize
(Ptyp
));
4261 Rewrite
(N
, Make_Integer_Literal
(Loc
, Intval
=> Size
));
4262 Analyze_And_Resolve
(N
, Typ
);
4269 -- 1. Deal with enumeration types with holes
4270 -- 2. For floating-point, generate call to attribute function
4271 -- 3. For other cases, deal with constraint checking
4273 when Attribute_Succ
=> Succ
: declare
4274 Etyp
: constant Entity_Id
:= Base_Type
(Ptyp
);
4278 -- For enumeration types with non-standard representations, we
4279 -- expand typ'Succ (x) into
4281 -- Pos_To_Rep (Rep_To_Pos (x) + 1)
4283 -- If the representation is contiguous, we compute instead
4284 -- Lit1 + Rep_to_Pos (x+1), to catch invalid representations.
4286 if Is_Enumeration_Type
(Ptyp
)
4287 and then Present
(Enum_Pos_To_Rep
(Etyp
))
4289 if Has_Contiguous_Rep
(Etyp
) then
4291 Unchecked_Convert_To
(Ptyp
,
4294 Make_Integer_Literal
(Loc
,
4295 Enumeration_Rep
(First_Literal
(Ptyp
))),
4297 Make_Function_Call
(Loc
,
4300 (TSS
(Etyp
, TSS_Rep_To_Pos
), Loc
),
4302 Parameter_Associations
=>
4304 Unchecked_Convert_To
(Ptyp
,
4307 Unchecked_Convert_To
(Standard_Integer
,
4308 Relocate_Node
(First
(Exprs
))),
4310 Make_Integer_Literal
(Loc
, 1))),
4311 Rep_To_Pos_Flag
(Ptyp
, Loc
))))));
4313 -- Add Boolean parameter True, to request program errror if
4314 -- we have a bad representation on our hands. Add False if
4315 -- checks are suppressed.
4317 Append_To
(Exprs
, Rep_To_Pos_Flag
(Ptyp
, Loc
));
4319 Make_Indexed_Component
(Loc
,
4322 (Enum_Pos_To_Rep
(Etyp
), Loc
),
4323 Expressions
=> New_List
(
4326 Make_Function_Call
(Loc
,
4329 (TSS
(Etyp
, TSS_Rep_To_Pos
), Loc
),
4330 Parameter_Associations
=> Exprs
),
4331 Right_Opnd
=> Make_Integer_Literal
(Loc
, 1)))));
4334 Analyze_And_Resolve
(N
, Typ
);
4336 -- For floating-point, we transform 'Succ into a call to the Succ
4337 -- floating-point attribute function in Fat_xxx (xxx is root type)
4339 elsif Is_Floating_Point_Type
(Ptyp
) then
4340 Expand_Fpt_Attribute_R
(N
);
4341 Analyze_And_Resolve
(N
, Typ
);
4343 -- For modular types, nothing to do (no overflow, since wraps)
4345 elsif Is_Modular_Integer_Type
(Ptyp
) then
4348 -- For other types, if argument is marked as needing a range check or
4349 -- overflow checking is enabled, we must generate a check.
4351 elsif not Overflow_Checks_Suppressed
(Ptyp
)
4352 or else Do_Range_Check
(First
(Exprs
))
4354 Set_Do_Range_Check
(First
(Exprs
), False);
4355 Expand_Pred_Succ
(N
);
4363 -- Transforms X'Tag into a direct reference to the tag of X
4365 when Attribute_Tag
=> Tag
: declare
4367 Prefix_Is_Type
: Boolean;
4370 if Is_Entity_Name
(Pref
) and then Is_Type
(Entity
(Pref
)) then
4371 Ttyp
:= Entity
(Pref
);
4372 Prefix_Is_Type
:= True;
4375 Prefix_Is_Type
:= False;
4378 if Is_Class_Wide_Type
(Ttyp
) then
4379 Ttyp
:= Root_Type
(Ttyp
);
4382 Ttyp
:= Underlying_Type
(Ttyp
);
4384 -- Ada 2005: The type may be a synchronized tagged type, in which
4385 -- case the tag information is stored in the corresponding record.
4387 if Is_Concurrent_Type
(Ttyp
) then
4388 Ttyp
:= Corresponding_Record_Type
(Ttyp
);
4391 if Prefix_Is_Type
then
4393 -- For VMs we leave the type attribute unexpanded because
4394 -- there's not a dispatching table to reference.
4396 if Tagged_Type_Expansion
then
4398 Unchecked_Convert_To
(RTE
(RE_Tag
),
4400 (Node
(First_Elmt
(Access_Disp_Table
(Ttyp
))), Loc
)));
4401 Analyze_And_Resolve
(N
, RTE
(RE_Tag
));
4404 -- Ada 2005 (AI-251): The use of 'Tag in the sources always
4405 -- references the primary tag of the actual object. If 'Tag is
4406 -- applied to class-wide interface objects we generate code that
4407 -- displaces "this" to reference the base of the object.
4409 elsif Comes_From_Source
(N
)
4410 and then Is_Class_Wide_Type
(Etype
(Prefix
(N
)))
4411 and then Is_Interface
(Etype
(Prefix
(N
)))
4414 -- (To_Tag_Ptr (Prefix'Address)).all
4416 -- Note that Prefix'Address is recursively expanded into a call
4417 -- to Base_Address (Obj.Tag)
4419 -- Not needed for VM targets, since all handled by the VM
4421 if Tagged_Type_Expansion
then
4423 Make_Explicit_Dereference
(Loc
,
4424 Unchecked_Convert_To
(RTE
(RE_Tag_Ptr
),
4425 Make_Attribute_Reference
(Loc
,
4426 Prefix
=> Relocate_Node
(Pref
),
4427 Attribute_Name
=> Name_Address
))));
4428 Analyze_And_Resolve
(N
, RTE
(RE_Tag
));
4433 Make_Selected_Component
(Loc
,
4434 Prefix
=> Relocate_Node
(Pref
),
4436 New_Reference_To
(First_Tag_Component
(Ttyp
), Loc
)));
4437 Analyze_And_Resolve
(N
, RTE
(RE_Tag
));
4445 -- Transforms 'Terminated attribute into a call to Terminated function
4447 when Attribute_Terminated
=> Terminated
:
4449 -- The prefix of Terminated is of a task interface class-wide type.
4451 -- terminated (Task_Id (Pref._disp_get_task_id));
4453 if Ada_Version
>= Ada_05
4454 and then Ekind
(Ptyp
) = E_Class_Wide_Type
4455 and then Is_Interface
(Ptyp
)
4456 and then Is_Task_Interface
(Ptyp
)
4459 Make_Function_Call
(Loc
,
4461 New_Reference_To
(RTE
(RE_Terminated
), Loc
),
4462 Parameter_Associations
=> New_List
(
4463 Make_Unchecked_Type_Conversion
(Loc
,
4465 New_Reference_To
(RTE
(RO_ST_Task_Id
), Loc
),
4467 Make_Selected_Component
(Loc
,
4469 New_Copy_Tree
(Pref
),
4471 Make_Identifier
(Loc
, Name_uDisp_Get_Task_Id
))))));
4473 elsif Restricted_Profile
then
4475 Build_Call_With_Task
(Pref
, RTE
(RE_Restricted_Terminated
)));
4479 Build_Call_With_Task
(Pref
, RTE
(RE_Terminated
)));
4482 Analyze_And_Resolve
(N
, Standard_Boolean
);
4489 -- Transforms System'To_Address (X) into unchecked conversion
4490 -- from (integral) type of X to type address.
4492 when Attribute_To_Address
=>
4494 Unchecked_Convert_To
(RTE
(RE_Address
),
4495 Relocate_Node
(First
(Exprs
))));
4496 Analyze_And_Resolve
(N
, RTE
(RE_Address
));
4502 when Attribute_To_Any
=> To_Any
: declare
4503 P_Type
: constant Entity_Id
:= Etype
(Pref
);
4504 Decls
: constant List_Id
:= New_List
;
4508 (Convert_To
(P_Type
,
4509 Relocate_Node
(First
(Exprs
))), Decls
));
4510 Insert_Actions
(N
, Decls
);
4511 Analyze_And_Resolve
(N
, RTE
(RE_Any
));
4518 -- Transforms 'Truncation into a call to the floating-point attribute
4519 -- function Truncation in Fat_xxx (where xxx is the root type).
4520 -- Expansion is avoided for cases the back end can handle directly.
4522 when Attribute_Truncation
=>
4523 if not Is_Inline_Floating_Point_Attribute
(N
) then
4524 Expand_Fpt_Attribute_R
(N
);
4531 when Attribute_TypeCode
=> TypeCode
: declare
4532 P_Type
: constant Entity_Id
:= Etype
(Pref
);
4533 Decls
: constant List_Id
:= New_List
;
4535 Rewrite
(N
, Build_TypeCode_Call
(Loc
, P_Type
, Decls
));
4536 Insert_Actions
(N
, Decls
);
4537 Analyze_And_Resolve
(N
, RTE
(RE_TypeCode
));
4540 -----------------------
4541 -- Unbiased_Rounding --
4542 -----------------------
4544 -- Transforms 'Unbiased_Rounding into a call to the floating-point
4545 -- attribute function Unbiased_Rounding in Fat_xxx (where xxx is the
4546 -- root type). Expansion is avoided for cases the back end can handle
4549 when Attribute_Unbiased_Rounding
=>
4550 if not Is_Inline_Floating_Point_Attribute
(N
) then
4551 Expand_Fpt_Attribute_R
(N
);
4558 when Attribute_UET_Address
=> UET_Address
: declare
4559 Ent
: constant Entity_Id
:= Make_Temporary
(Loc
, 'T');
4563 Make_Object_Declaration
(Loc
,
4564 Defining_Identifier
=> Ent
,
4565 Aliased_Present
=> True,
4566 Object_Definition
=>
4567 New_Occurrence_Of
(RTE
(RE_Address
), Loc
)));
4569 -- Construct name __gnat_xxx__SDP, where xxx is the unit name
4570 -- in normal external form.
4572 Get_External_Unit_Name_String
(Get_Unit_Name
(Pref
));
4573 Name_Buffer
(1 + 7 .. Name_Len
+ 7) := Name_Buffer
(1 .. Name_Len
);
4574 Name_Len
:= Name_Len
+ 7;
4575 Name_Buffer
(1 .. 7) := "__gnat_";
4576 Name_Buffer
(Name_Len
+ 1 .. Name_Len
+ 5) := "__SDP";
4577 Name_Len
:= Name_Len
+ 5;
4579 Set_Is_Imported
(Ent
);
4580 Set_Interface_Name
(Ent
,
4581 Make_String_Literal
(Loc
,
4582 Strval
=> String_From_Name_Buffer
));
4584 -- Set entity as internal to ensure proper Sprint output of its
4585 -- implicit importation.
4587 Set_Is_Internal
(Ent
);
4590 Make_Attribute_Reference
(Loc
,
4591 Prefix
=> New_Occurrence_Of
(Ent
, Loc
),
4592 Attribute_Name
=> Name_Address
));
4594 Analyze_And_Resolve
(N
, Typ
);
4601 -- The processing for VADS_Size is shared with Size
4607 -- For enumeration types with a standard representation, and for all
4608 -- other types, Val is handled by the back end. For enumeration types
4609 -- with a non-standard representation we use the _Pos_To_Rep array that
4610 -- was created when the type was frozen.
4612 when Attribute_Val
=> Val
: declare
4613 Etyp
: constant Entity_Id
:= Base_Type
(Entity
(Pref
));
4616 if Is_Enumeration_Type
(Etyp
)
4617 and then Present
(Enum_Pos_To_Rep
(Etyp
))
4619 if Has_Contiguous_Rep
(Etyp
) then
4621 Rep_Node
: constant Node_Id
:=
4622 Unchecked_Convert_To
(Etyp
,
4625 Make_Integer_Literal
(Loc
,
4626 Enumeration_Rep
(First_Literal
(Etyp
))),
4628 (Convert_To
(Standard_Integer
,
4629 Relocate_Node
(First
(Exprs
))))));
4633 Unchecked_Convert_To
(Etyp
,
4636 Make_Integer_Literal
(Loc
,
4637 Enumeration_Rep
(First_Literal
(Etyp
))),
4639 Make_Function_Call
(Loc
,
4642 (TSS
(Etyp
, TSS_Rep_To_Pos
), Loc
),
4643 Parameter_Associations
=> New_List
(
4645 Rep_To_Pos_Flag
(Etyp
, Loc
))))));
4650 Make_Indexed_Component
(Loc
,
4651 Prefix
=> New_Reference_To
(Enum_Pos_To_Rep
(Etyp
), Loc
),
4652 Expressions
=> New_List
(
4653 Convert_To
(Standard_Integer
,
4654 Relocate_Node
(First
(Exprs
))))));
4657 Analyze_And_Resolve
(N
, Typ
);
4659 -- If the argument is marked as requiring a range check then generate
4662 elsif Do_Range_Check
(First
(Exprs
)) then
4663 Set_Do_Range_Check
(First
(Exprs
), False);
4664 Generate_Range_Check
(First
(Exprs
), Etyp
, CE_Range_Check_Failed
);
4672 -- The code for valid is dependent on the particular types involved.
4673 -- See separate sections below for the generated code in each case.
4675 when Attribute_Valid
=> Valid
: declare
4676 Btyp
: Entity_Id
:= Base_Type
(Ptyp
);
4679 Save_Validity_Checks_On
: constant Boolean := Validity_Checks_On
;
4680 -- Save the validity checking mode. We always turn off validity
4681 -- checking during process of 'Valid since this is one place
4682 -- where we do not want the implicit validity checks to intefere
4683 -- with the explicit validity check that the programmer is doing.
4685 function Make_Range_Test
return Node_Id
;
4686 -- Build the code for a range test of the form
4687 -- Btyp!(Pref) >= Btyp!(Ptyp'First)
4689 -- Btyp!(Pref) <= Btyp!(Ptyp'Last)
4691 ---------------------
4692 -- Make_Range_Test --
4693 ---------------------
4695 function Make_Range_Test
return Node_Id
is
4696 Temp
: constant Node_Id
:= Duplicate_Subexpr
(Pref
);
4699 -- The value whose validity is being checked has been captured in
4700 -- an object declaration. We certainly don't want this object to
4701 -- appear valid because the declaration initializes it!
4703 if Is_Entity_Name
(Temp
) then
4704 Set_Is_Known_Valid
(Entity
(Temp
), False);
4712 Unchecked_Convert_To
(Btyp
, Temp
),
4715 Unchecked_Convert_To
(Btyp
,
4716 Make_Attribute_Reference
(Loc
,
4717 Prefix
=> New_Occurrence_Of
(Ptyp
, Loc
),
4718 Attribute_Name
=> Name_First
))),
4723 Unchecked_Convert_To
(Btyp
, Temp
),
4726 Unchecked_Convert_To
(Btyp
,
4727 Make_Attribute_Reference
(Loc
,
4728 Prefix
=> New_Occurrence_Of
(Ptyp
, Loc
),
4729 Attribute_Name
=> Name_Last
))));
4730 end Make_Range_Test
;
4732 -- Start of processing for Attribute_Valid
4735 -- Do not expand sourced code 'Valid reference in CodePeer mode,
4736 -- will be handled by the back-end directly.
4738 if CodePeer_Mode
and then Comes_From_Source
(N
) then
4742 -- Turn off validity checks. We do not want any implicit validity
4743 -- checks to intefere with the explicit check from the attribute
4745 Validity_Checks_On
:= False;
4747 -- Floating-point case. This case is handled by the Valid attribute
4748 -- code in the floating-point attribute run-time library.
4750 if Is_Floating_Point_Type
(Ptyp
) then
4756 -- For vax fpt types, call appropriate routine in special vax
4757 -- floating point unit. We do not have to worry about loads in
4758 -- this case, since these types have no signalling NaN's.
4760 if Vax_Float
(Btyp
) then
4761 Expand_Vax_Valid
(N
);
4763 -- The AAMP back end handles Valid for floating-point types
4765 elsif Is_AAMP_Float
(Btyp
) then
4766 Analyze_And_Resolve
(Pref
, Ptyp
);
4767 Set_Etype
(N
, Standard_Boolean
);
4770 -- Non VAX float case
4773 Find_Fat_Info
(Ptyp
, Ftp
, Pkg
);
4775 -- If the floating-point object might be unaligned, we need
4776 -- to call the special routine Unaligned_Valid, which makes
4777 -- the needed copy, being careful not to load the value into
4778 -- any floating-point register. The argument in this case is
4779 -- obj'Address (see Unaligned_Valid routine in Fat_Gen).
4781 if Is_Possibly_Unaligned_Object
(Pref
) then
4782 Expand_Fpt_Attribute
4783 (N
, Pkg
, Name_Unaligned_Valid
,
4785 Make_Attribute_Reference
(Loc
,
4786 Prefix
=> Relocate_Node
(Pref
),
4787 Attribute_Name
=> Name_Address
)));
4789 -- In the normal case where we are sure the object is
4790 -- aligned, we generate a call to Valid, and the argument in
4791 -- this case is obj'Unrestricted_Access (after converting
4792 -- obj to the right floating-point type).
4795 Expand_Fpt_Attribute
4796 (N
, Pkg
, Name_Valid
,
4798 Make_Attribute_Reference
(Loc
,
4799 Prefix
=> Unchecked_Convert_To
(Ftp
, Pref
),
4800 Attribute_Name
=> Name_Unrestricted_Access
)));
4804 -- One more task, we still need a range check. Required
4805 -- only if we have a constraint, since the Valid routine
4806 -- catches infinities properly (infinities are never valid).
4808 -- The way we do the range check is simply to create the
4809 -- expression: Valid (N) and then Base_Type(Pref) in Typ.
4811 if not Subtypes_Statically_Match
(Ptyp
, Btyp
) then
4814 Left_Opnd
=> Relocate_Node
(N
),
4817 Left_Opnd
=> Convert_To
(Btyp
, Pref
),
4818 Right_Opnd
=> New_Occurrence_Of
(Ptyp
, Loc
))));
4822 -- Enumeration type with holes
4824 -- For enumeration types with holes, the Pos value constructed by
4825 -- the Enum_Rep_To_Pos function built in Exp_Ch3 called with a
4826 -- second argument of False returns minus one for an invalid value,
4827 -- and the non-negative pos value for a valid value, so the
4828 -- expansion of X'Valid is simply:
4830 -- type(X)'Pos (X) >= 0
4832 -- We can't quite generate it that way because of the requirement
4833 -- for the non-standard second argument of False in the resulting
4834 -- rep_to_pos call, so we have to explicitly create:
4836 -- _rep_to_pos (X, False) >= 0
4838 -- If we have an enumeration subtype, we also check that the
4839 -- value is in range:
4841 -- _rep_to_pos (X, False) >= 0
4843 -- (X >= type(X)'First and then type(X)'Last <= X)
4845 elsif Is_Enumeration_Type
(Ptyp
)
4846 and then Present
(Enum_Pos_To_Rep
(Base_Type
(Ptyp
)))
4851 Make_Function_Call
(Loc
,
4854 (TSS
(Base_Type
(Ptyp
), TSS_Rep_To_Pos
), Loc
),
4855 Parameter_Associations
=> New_List
(
4857 New_Occurrence_Of
(Standard_False
, Loc
))),
4858 Right_Opnd
=> Make_Integer_Literal
(Loc
, 0));
4862 (Type_Low_Bound
(Ptyp
) /= Type_Low_Bound
(Btyp
)
4864 Type_High_Bound
(Ptyp
) /= Type_High_Bound
(Btyp
))
4866 -- The call to Make_Range_Test will create declarations
4867 -- that need a proper insertion point, but Pref is now
4868 -- attached to a node with no ancestor. Attach to tree
4869 -- even if it is to be rewritten below.
4871 Set_Parent
(Tst
, Parent
(N
));
4875 Left_Opnd
=> Make_Range_Test
,
4881 -- Fortran convention booleans
4883 -- For the very special case of Fortran convention booleans, the
4884 -- value is always valid, since it is an integer with the semantics
4885 -- that non-zero is true, and any value is permissible.
4887 elsif Is_Boolean_Type
(Ptyp
)
4888 and then Convention
(Ptyp
) = Convention_Fortran
4890 Rewrite
(N
, New_Occurrence_Of
(Standard_True
, Loc
));
4892 -- For biased representations, we will be doing an unchecked
4893 -- conversion without unbiasing the result. That means that the range
4894 -- test has to take this into account, and the proper form of the
4897 -- Btyp!(Pref) < Btyp!(Ptyp'Range_Length)
4899 elsif Has_Biased_Representation
(Ptyp
) then
4900 Btyp
:= RTE
(RE_Unsigned_32
);
4904 Unchecked_Convert_To
(Btyp
, Duplicate_Subexpr
(Pref
)),
4906 Unchecked_Convert_To
(Btyp
,
4907 Make_Attribute_Reference
(Loc
,
4908 Prefix
=> New_Occurrence_Of
(Ptyp
, Loc
),
4909 Attribute_Name
=> Name_Range_Length
))));
4911 -- For all other scalar types, what we want logically is a
4914 -- X in type(X)'First .. type(X)'Last
4916 -- But that's precisely what won't work because of possible
4917 -- unwanted optimization (and indeed the basic motivation for
4918 -- the Valid attribute is exactly that this test does not work!)
4919 -- What will work is:
4921 -- Btyp!(X) >= Btyp!(type(X)'First)
4923 -- Btyp!(X) <= Btyp!(type(X)'Last)
4925 -- where Btyp is an integer type large enough to cover the full
4926 -- range of possible stored values (i.e. it is chosen on the basis
4927 -- of the size of the type, not the range of the values). We write
4928 -- this as two tests, rather than a range check, so that static
4929 -- evaluation will easily remove either or both of the checks if
4930 -- they can be -statically determined to be true (this happens
4931 -- when the type of X is static and the range extends to the full
4932 -- range of stored values).
4934 -- Unsigned types. Note: it is safe to consider only whether the
4935 -- subtype is unsigned, since we will in that case be doing all
4936 -- unsigned comparisons based on the subtype range. Since we use the
4937 -- actual subtype object size, this is appropriate.
4939 -- For example, if we have
4941 -- subtype x is integer range 1 .. 200;
4942 -- for x'Object_Size use 8;
4944 -- Now the base type is signed, but objects of this type are bits
4945 -- unsigned, and doing an unsigned test of the range 1 to 200 is
4946 -- correct, even though a value greater than 127 looks signed to a
4947 -- signed comparison.
4949 elsif Is_Unsigned_Type
(Ptyp
) then
4950 if Esize
(Ptyp
) <= 32 then
4951 Btyp
:= RTE
(RE_Unsigned_32
);
4953 Btyp
:= RTE
(RE_Unsigned_64
);
4956 Rewrite
(N
, Make_Range_Test
);
4961 if Esize
(Ptyp
) <= Esize
(Standard_Integer
) then
4962 Btyp
:= Standard_Integer
;
4964 Btyp
:= Universal_Integer
;
4967 Rewrite
(N
, Make_Range_Test
);
4970 Analyze_And_Resolve
(N
, Standard_Boolean
);
4971 Validity_Checks_On
:= Save_Validity_Checks_On
;
4978 -- Value attribute is handled in separate unti Exp_Imgv
4980 when Attribute_Value
=>
4981 Exp_Imgv
.Expand_Value_Attribute
(N
);
4987 -- The processing for Value_Size shares the processing for Size
4993 -- The processing for Version shares the processing for Body_Version
4999 -- Wide_Image attribute is handled in separate unit Exp_Imgv
5001 when Attribute_Wide_Image
=>
5002 Exp_Imgv
.Expand_Wide_Image_Attribute
(N
);
5004 ---------------------
5005 -- Wide_Wide_Image --
5006 ---------------------
5008 -- Wide_Wide_Image attribute is handled in separate unit Exp_Imgv
5010 when Attribute_Wide_Wide_Image
=>
5011 Exp_Imgv
.Expand_Wide_Wide_Image_Attribute
(N
);
5017 -- We expand typ'Wide_Value (X) into
5020 -- (Wide_String_To_String (X, Wide_Character_Encoding_Method))
5022 -- Wide_String_To_String is a runtime function that converts its wide
5023 -- string argument to String, converting any non-translatable characters
5024 -- into appropriate escape sequences. This preserves the required
5025 -- semantics of Wide_Value in all cases, and results in a very simple
5026 -- implementation approach.
5028 -- Note: for this approach to be fully standard compliant for the cases
5029 -- where typ is Wide_Character and Wide_Wide_Character, the encoding
5030 -- method must cover the entire character range (e.g. UTF-8). But that
5031 -- is a reasonable requirement when dealing with encoded character
5032 -- sequences. Presumably if one of the restrictive encoding mechanisms
5033 -- is in use such as Shift-JIS, then characters that cannot be
5034 -- represented using this encoding will not appear in any case.
5036 when Attribute_Wide_Value
=> Wide_Value
:
5039 Make_Attribute_Reference
(Loc
,
5041 Attribute_Name
=> Name_Value
,
5043 Expressions
=> New_List
(
5044 Make_Function_Call
(Loc
,
5046 New_Reference_To
(RTE
(RE_Wide_String_To_String
), Loc
),
5048 Parameter_Associations
=> New_List
(
5049 Relocate_Node
(First
(Exprs
)),
5050 Make_Integer_Literal
(Loc
,
5051 Intval
=> Int
(Wide_Character_Encoding_Method
)))))));
5053 Analyze_And_Resolve
(N
, Typ
);
5056 ---------------------
5057 -- Wide_Wide_Value --
5058 ---------------------
5060 -- We expand typ'Wide_Value_Value (X) into
5063 -- (Wide_Wide_String_To_String (X, Wide_Character_Encoding_Method))
5065 -- Wide_Wide_String_To_String is a runtime function that converts its
5066 -- wide string argument to String, converting any non-translatable
5067 -- characters into appropriate escape sequences. This preserves the
5068 -- required semantics of Wide_Wide_Value in all cases, and results in a
5069 -- very simple implementation approach.
5071 -- It's not quite right where typ = Wide_Wide_Character, because the
5072 -- encoding method may not cover the whole character type ???
5074 when Attribute_Wide_Wide_Value
=> Wide_Wide_Value
:
5077 Make_Attribute_Reference
(Loc
,
5079 Attribute_Name
=> Name_Value
,
5081 Expressions
=> New_List
(
5082 Make_Function_Call
(Loc
,
5084 New_Reference_To
(RTE
(RE_Wide_Wide_String_To_String
), Loc
),
5086 Parameter_Associations
=> New_List
(
5087 Relocate_Node
(First
(Exprs
)),
5088 Make_Integer_Literal
(Loc
,
5089 Intval
=> Int
(Wide_Character_Encoding_Method
)))))));
5091 Analyze_And_Resolve
(N
, Typ
);
5092 end Wide_Wide_Value
;
5094 ---------------------
5095 -- Wide_Wide_Width --
5096 ---------------------
5098 -- Wide_Wide_Width attribute is handled in separate unit Exp_Imgv
5100 when Attribute_Wide_Wide_Width
=>
5101 Exp_Imgv
.Expand_Width_Attribute
(N
, Wide_Wide
);
5107 -- Wide_Width attribute is handled in separate unit Exp_Imgv
5109 when Attribute_Wide_Width
=>
5110 Exp_Imgv
.Expand_Width_Attribute
(N
, Wide
);
5116 -- Width attribute is handled in separate unit Exp_Imgv
5118 when Attribute_Width
=>
5119 Exp_Imgv
.Expand_Width_Attribute
(N
, Normal
);
5125 when Attribute_Write
=> Write
: declare
5126 P_Type
: constant Entity_Id
:= Entity
(Pref
);
5127 U_Type
: constant Entity_Id
:= Underlying_Type
(P_Type
);
5135 -- If no underlying type, we have an error that will be diagnosed
5136 -- elsewhere, so here we just completely ignore the expansion.
5142 -- The simple case, if there is a TSS for Write, just call it
5144 Pname
:= Find_Stream_Subprogram
(P_Type
, TSS_Stream_Write
);
5146 if Present
(Pname
) then
5150 -- If there is a Stream_Convert pragma, use it, we rewrite
5152 -- sourcetyp'Output (stream, Item)
5156 -- strmtyp'Output (Stream, strmwrite (acttyp (Item)));
5158 -- where strmwrite is the given Write function that converts an
5159 -- argument of type sourcetyp or a type acctyp, from which it is
5160 -- derived to type strmtyp. The conversion to acttyp is required
5161 -- for the derived case.
5163 Prag
:= Get_Stream_Convert_Pragma
(P_Type
);
5165 if Present
(Prag
) then
5167 Next
(Next
(First
(Pragma_Argument_Associations
(Prag
))));
5168 Wfunc
:= Entity
(Expression
(Arg3
));
5171 Make_Attribute_Reference
(Loc
,
5172 Prefix
=> New_Occurrence_Of
(Etype
(Wfunc
), Loc
),
5173 Attribute_Name
=> Name_Output
,
5174 Expressions
=> New_List
(
5175 Relocate_Node
(First
(Exprs
)),
5176 Make_Function_Call
(Loc
,
5177 Name
=> New_Occurrence_Of
(Wfunc
, Loc
),
5178 Parameter_Associations
=> New_List
(
5179 OK_Convert_To
(Etype
(First_Formal
(Wfunc
)),
5180 Relocate_Node
(Next
(First
(Exprs
)))))))));
5185 -- For elementary types, we call the W_xxx routine directly
5187 elsif Is_Elementary_Type
(U_Type
) then
5188 Rewrite
(N
, Build_Elementary_Write_Call
(N
));
5194 elsif Is_Array_Type
(U_Type
) then
5195 Build_Array_Write_Procedure
(N
, U_Type
, Decl
, Pname
);
5196 Compile_Stream_Body_In_Scope
(N
, Decl
, U_Type
, Check
=> False);
5198 -- Tagged type case, use the primitive Write function. Note that
5199 -- this will dispatch in the class-wide case which is what we want
5201 elsif Is_Tagged_Type
(U_Type
) then
5202 Pname
:= Find_Prim_Op
(U_Type
, TSS_Stream_Write
);
5204 -- All other record type cases, including protected records.
5205 -- The latter only arise for expander generated code for
5206 -- handling shared passive partition access.
5210 (Is_Record_Type
(U_Type
) or else Is_Protected_Type
(U_Type
));
5212 -- Ada 2005 (AI-216): Program_Error is raised when executing
5213 -- the default implementation of the Write attribute of an
5214 -- Unchecked_Union type. However, if the 'Write reference is
5215 -- within the generated Output stream procedure, Write outputs
5216 -- the components, and the default values of the discriminant
5217 -- are streamed by the Output procedure itself.
5219 if Is_Unchecked_Union
(Base_Type
(U_Type
))
5220 and not Is_TSS
(Current_Scope
, TSS_Stream_Output
)
5223 Make_Raise_Program_Error
(Loc
,
5224 Reason
=> PE_Unchecked_Union_Restriction
));
5227 if Has_Discriminants
(U_Type
)
5229 (Discriminant_Default_Value
(First_Discriminant
(U_Type
)))
5231 Build_Mutable_Record_Write_Procedure
5232 (Loc
, Base_Type
(U_Type
), Decl
, Pname
);
5234 Build_Record_Write_Procedure
5235 (Loc
, Base_Type
(U_Type
), Decl
, Pname
);
5238 Insert_Action
(N
, Decl
);
5242 -- If we fall through, Pname is the procedure to be called
5244 Rewrite_Stream_Proc_Call
(Pname
);
5247 -- Component_Size is handled by the back end, unless the component size
5248 -- is known at compile time, which is always true in the packed array
5249 -- case. It is important that the packed array case is handled in the
5250 -- front end (see Eval_Attribute) since the back end would otherwise get
5251 -- confused by the equivalent packed array type.
5253 when Attribute_Component_Size
=>
5256 -- The following attributes are handled by the back end (except that
5257 -- static cases have already been evaluated during semantic processing,
5258 -- but in any case the back end should not count on this). The one bit
5259 -- of special processing required is that these attributes typically
5260 -- generate conditionals in the code, so we need to check the relevant
5263 when Attribute_Max |
5265 Check_Restriction
(No_Implicit_Conditionals
, N
);
5267 -- The following attributes are handled by the back end (except that
5268 -- static cases have already been evaluated during semantic processing,
5269 -- but in any case the back end should not count on this).
5271 -- The back end also handles the non-class-wide cases of Size
5273 when Attribute_Bit_Order |
5274 Attribute_Code_Address |
5275 Attribute_Definite |
5276 Attribute_Null_Parameter |
5277 Attribute_Passed_By_Reference |
5278 Attribute_Pool_Address
=>
5281 -- The following attributes are also handled by the back end, but return
5282 -- a universal integer result, so may need a conversion for checking
5283 -- that the result is in range.
5285 when Attribute_Aft |
5286 Attribute_Max_Size_In_Storage_Elements
5288 Apply_Universal_Integer_Attribute_Checks
(N
);
5290 -- The following attributes should not appear at this stage, since they
5291 -- have already been handled by the analyzer (and properly rewritten
5292 -- with corresponding values or entities to represent the right values)
5294 when Attribute_Abort_Signal |
5295 Attribute_Address_Size |
5298 Attribute_Compiler_Version |
5299 Attribute_Default_Bit_Order |
5306 Attribute_Fast_Math |
5307 Attribute_Has_Access_Values |
5308 Attribute_Has_Discriminants |
5309 Attribute_Has_Tagged_Values |
5311 Attribute_Machine_Emax |
5312 Attribute_Machine_Emin |
5313 Attribute_Machine_Mantissa |
5314 Attribute_Machine_Overflows |
5315 Attribute_Machine_Radix |
5316 Attribute_Machine_Rounds |
5317 Attribute_Maximum_Alignment |
5318 Attribute_Model_Emin |
5319 Attribute_Model_Epsilon |
5320 Attribute_Model_Mantissa |
5321 Attribute_Model_Small |
5323 Attribute_Partition_ID |
5325 Attribute_Safe_Emax |
5326 Attribute_Safe_First |
5327 Attribute_Safe_Large |
5328 Attribute_Safe_Last |
5329 Attribute_Safe_Small |
5331 Attribute_Signed_Zeros |
5333 Attribute_Storage_Unit |
5334 Attribute_Stub_Type |
5335 Attribute_Target_Name |
5336 Attribute_Type_Class |
5337 Attribute_Unconstrained_Array |
5338 Attribute_Universal_Literal_String |
5339 Attribute_Wchar_T_Size |
5340 Attribute_Word_Size
=>
5342 raise Program_Error
;
5344 -- The Asm_Input and Asm_Output attributes are not expanded at this
5345 -- stage, but will be eliminated in the expansion of the Asm call, see
5346 -- Exp_Intr for details. So the back end will never see these either.
5348 when Attribute_Asm_Input |
5349 Attribute_Asm_Output
=>
5356 when RE_Not_Available
=>
5358 end Expand_N_Attribute_Reference
;
5360 ----------------------
5361 -- Expand_Pred_Succ --
5362 ----------------------
5364 -- For typ'Pred (exp), we generate the check
5366 -- [constraint_error when exp = typ'Base'First]
5368 -- Similarly, for typ'Succ (exp), we generate the check
5370 -- [constraint_error when exp = typ'Base'Last]
5372 -- These checks are not generated for modular types, since the proper
5373 -- semantics for Succ and Pred on modular types is to wrap, not raise CE.
5375 procedure Expand_Pred_Succ
(N
: Node_Id
) is
5376 Loc
: constant Source_Ptr
:= Sloc
(N
);
5380 if Attribute_Name
(N
) = Name_Pred
then
5387 Make_Raise_Constraint_Error
(Loc
,
5391 Duplicate_Subexpr_Move_Checks
(First
(Expressions
(N
))),
5393 Make_Attribute_Reference
(Loc
,
5395 New_Reference_To
(Base_Type
(Etype
(Prefix
(N
))), Loc
),
5396 Attribute_Name
=> Cnam
)),
5397 Reason
=> CE_Overflow_Check_Failed
));
5398 end Expand_Pred_Succ
;
5404 procedure Find_Fat_Info
5406 Fat_Type
: out Entity_Id
;
5407 Fat_Pkg
: out RE_Id
)
5409 Btyp
: constant Entity_Id
:= Base_Type
(T
);
5410 Rtyp
: constant Entity_Id
:= Root_Type
(T
);
5411 Digs
: constant Nat
:= UI_To_Int
(Digits_Value
(Btyp
));
5414 -- If the base type is VAX float, then get appropriate VAX float type
5416 if Vax_Float
(Btyp
) then
5419 Fat_Type
:= RTE
(RE_Fat_VAX_F
);
5420 Fat_Pkg
:= RE_Attr_VAX_F_Float
;
5423 Fat_Type
:= RTE
(RE_Fat_VAX_D
);
5424 Fat_Pkg
:= RE_Attr_VAX_D_Float
;
5427 Fat_Type
:= RTE
(RE_Fat_VAX_G
);
5428 Fat_Pkg
:= RE_Attr_VAX_G_Float
;
5431 raise Program_Error
;
5434 -- If root type is VAX float, this is the case where the library has
5435 -- been recompiled in VAX float mode, and we have an IEEE float type.
5436 -- This is when we use the special IEEE Fat packages.
5438 elsif Vax_Float
(Rtyp
) then
5441 Fat_Type
:= RTE
(RE_Fat_IEEE_Short
);
5442 Fat_Pkg
:= RE_Attr_IEEE_Short
;
5445 Fat_Type
:= RTE
(RE_Fat_IEEE_Long
);
5446 Fat_Pkg
:= RE_Attr_IEEE_Long
;
5449 raise Program_Error
;
5452 -- If neither the base type nor the root type is VAX_Float then VAX
5453 -- float is out of the picture, and we can just use the root type.
5458 if Fat_Type
= Standard_Short_Float
then
5459 Fat_Pkg
:= RE_Attr_Short_Float
;
5461 elsif Fat_Type
= Standard_Float
then
5462 Fat_Pkg
:= RE_Attr_Float
;
5464 elsif Fat_Type
= Standard_Long_Float
then
5465 Fat_Pkg
:= RE_Attr_Long_Float
;
5467 elsif Fat_Type
= Standard_Long_Long_Float
then
5468 Fat_Pkg
:= RE_Attr_Long_Long_Float
;
5470 -- Universal real (which is its own root type) is treated as being
5471 -- equivalent to Standard.Long_Long_Float, since it is defined to
5472 -- have the same precision as the longest Float type.
5474 elsif Fat_Type
= Universal_Real
then
5475 Fat_Type
:= Standard_Long_Long_Float
;
5476 Fat_Pkg
:= RE_Attr_Long_Long_Float
;
5479 raise Program_Error
;
5484 ----------------------------
5485 -- Find_Stream_Subprogram --
5486 ----------------------------
5488 function Find_Stream_Subprogram
5490 Nam
: TSS_Name_Type
) return Entity_Id
5492 Base_Typ
: constant Entity_Id
:= Base_Type
(Typ
);
5493 Ent
: constant Entity_Id
:= TSS
(Typ
, Nam
);
5496 if Present
(Ent
) then
5500 -- Stream attributes for strings are expanded into library calls. The
5501 -- following checks are disabled when the run-time is not available or
5502 -- when compiling predefined types due to bootstrap issues. As a result,
5503 -- the compiler will generate in-place stream routines for string types
5504 -- that appear in GNAT's library, but will generate calls via rtsfind
5505 -- to library routines for user code.
5506 -- ??? For now, disable this code for JVM, since this generates a
5507 -- VerifyError exception at run-time on e.g. c330001.
5508 -- This is disabled for AAMP, to avoid making dependences on files not
5509 -- supported in the AAMP library (such as s-fileio.adb).
5511 if VM_Target
/= JVM_Target
5512 and then not AAMP_On_Target
5514 not Is_Predefined_File_Name
(Unit_File_Name
(Current_Sem_Unit
))
5516 -- String as defined in package Ada
5518 if Base_Typ
= Standard_String
then
5519 if Restriction_Active
(No_Stream_Optimizations
) then
5520 if Nam
= TSS_Stream_Input
then
5521 return RTE
(RE_String_Input
);
5523 elsif Nam
= TSS_Stream_Output
then
5524 return RTE
(RE_String_Output
);
5526 elsif Nam
= TSS_Stream_Read
then
5527 return RTE
(RE_String_Read
);
5529 else pragma Assert
(Nam
= TSS_Stream_Write
);
5530 return RTE
(RE_String_Write
);
5534 if Nam
= TSS_Stream_Input
then
5535 return RTE
(RE_String_Input_Blk_IO
);
5537 elsif Nam
= TSS_Stream_Output
then
5538 return RTE
(RE_String_Output_Blk_IO
);
5540 elsif Nam
= TSS_Stream_Read
then
5541 return RTE
(RE_String_Read_Blk_IO
);
5543 else pragma Assert
(Nam
= TSS_Stream_Write
);
5544 return RTE
(RE_String_Write_Blk_IO
);
5548 -- Wide_String as defined in package Ada
5550 elsif Base_Typ
= Standard_Wide_String
then
5551 if Restriction_Active
(No_Stream_Optimizations
) then
5552 if Nam
= TSS_Stream_Input
then
5553 return RTE
(RE_Wide_String_Input
);
5555 elsif Nam
= TSS_Stream_Output
then
5556 return RTE
(RE_Wide_String_Output
);
5558 elsif Nam
= TSS_Stream_Read
then
5559 return RTE
(RE_Wide_String_Read
);
5561 else pragma Assert
(Nam
= TSS_Stream_Write
);
5562 return RTE
(RE_Wide_String_Write
);
5566 if Nam
= TSS_Stream_Input
then
5567 return RTE
(RE_Wide_String_Input_Blk_IO
);
5569 elsif Nam
= TSS_Stream_Output
then
5570 return RTE
(RE_Wide_String_Output_Blk_IO
);
5572 elsif Nam
= TSS_Stream_Read
then
5573 return RTE
(RE_Wide_String_Read_Blk_IO
);
5575 else pragma Assert
(Nam
= TSS_Stream_Write
);
5576 return RTE
(RE_Wide_String_Write_Blk_IO
);
5580 -- Wide_Wide_String as defined in package Ada
5582 elsif Base_Typ
= Standard_Wide_Wide_String
then
5583 if Restriction_Active
(No_Stream_Optimizations
) then
5584 if Nam
= TSS_Stream_Input
then
5585 return RTE
(RE_Wide_Wide_String_Input
);
5587 elsif Nam
= TSS_Stream_Output
then
5588 return RTE
(RE_Wide_Wide_String_Output
);
5590 elsif Nam
= TSS_Stream_Read
then
5591 return RTE
(RE_Wide_Wide_String_Read
);
5593 else pragma Assert
(Nam
= TSS_Stream_Write
);
5594 return RTE
(RE_Wide_Wide_String_Write
);
5598 if Nam
= TSS_Stream_Input
then
5599 return RTE
(RE_Wide_Wide_String_Input_Blk_IO
);
5601 elsif Nam
= TSS_Stream_Output
then
5602 return RTE
(RE_Wide_Wide_String_Output_Blk_IO
);
5604 elsif Nam
= TSS_Stream_Read
then
5605 return RTE
(RE_Wide_Wide_String_Read_Blk_IO
);
5607 else pragma Assert
(Nam
= TSS_Stream_Write
);
5608 return RTE
(RE_Wide_Wide_String_Write_Blk_IO
);
5614 if Is_Tagged_Type
(Typ
)
5615 and then Is_Derived_Type
(Typ
)
5617 return Find_Prim_Op
(Typ
, Nam
);
5619 return Find_Inherited_TSS
(Typ
, Nam
);
5621 end Find_Stream_Subprogram
;
5623 -----------------------
5624 -- Get_Index_Subtype --
5625 -----------------------
5627 function Get_Index_Subtype
(N
: Node_Id
) return Node_Id
is
5628 P_Type
: Entity_Id
:= Etype
(Prefix
(N
));
5633 if Is_Access_Type
(P_Type
) then
5634 P_Type
:= Designated_Type
(P_Type
);
5637 if No
(Expressions
(N
)) then
5640 J
:= UI_To_Int
(Expr_Value
(First
(Expressions
(N
))));
5643 Indx
:= First_Index
(P_Type
);
5649 return Etype
(Indx
);
5650 end Get_Index_Subtype
;
5652 -------------------------------
5653 -- Get_Stream_Convert_Pragma --
5654 -------------------------------
5656 function Get_Stream_Convert_Pragma
(T
: Entity_Id
) return Node_Id
is
5661 -- Note: we cannot use Get_Rep_Pragma here because of the peculiarity
5662 -- that a stream convert pragma for a tagged type is not inherited from
5663 -- its parent. Probably what is wrong here is that it is basically
5664 -- incorrect to consider a stream convert pragma to be a representation
5665 -- pragma at all ???
5667 N
:= First_Rep_Item
(Implementation_Base_Type
(T
));
5668 while Present
(N
) loop
5669 if Nkind
(N
) = N_Pragma
5670 and then Pragma_Name
(N
) = Name_Stream_Convert
5672 -- For tagged types this pragma is not inherited, so we
5673 -- must verify that it is defined for the given type and
5677 Entity
(Expression
(First
(Pragma_Argument_Associations
(N
))));
5679 if not Is_Tagged_Type
(T
)
5681 or else (Is_Private_Type
(Typ
) and then T
= Full_View
(Typ
))
5691 end Get_Stream_Convert_Pragma
;
5693 ---------------------------------
5694 -- Is_Constrained_Packed_Array --
5695 ---------------------------------
5697 function Is_Constrained_Packed_Array
(Typ
: Entity_Id
) return Boolean is
5698 Arr
: Entity_Id
:= Typ
;
5701 if Is_Access_Type
(Arr
) then
5702 Arr
:= Designated_Type
(Arr
);
5705 return Is_Array_Type
(Arr
)
5706 and then Is_Constrained
(Arr
)
5707 and then Present
(Packed_Array_Type
(Arr
));
5708 end Is_Constrained_Packed_Array
;
5710 ----------------------------------------
5711 -- Is_Inline_Floating_Point_Attribute --
5712 ----------------------------------------
5714 function Is_Inline_Floating_Point_Attribute
(N
: Node_Id
) return Boolean is
5715 Id
: constant Attribute_Id
:= Get_Attribute_Id
(Attribute_Name
(N
));
5718 if Nkind
(Parent
(N
)) /= N_Type_Conversion
5719 or else not Is_Integer_Type
(Etype
(Parent
(N
)))
5724 -- Should also support 'Machine_Rounding and 'Unbiased_Rounding, but
5725 -- required back end support has not been implemented yet ???
5727 return Id
= Attribute_Truncation
;
5728 end Is_Inline_Floating_Point_Attribute
;