1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2009, 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
);
238 E_T
: constant Entity_Id
:= Equivalent_Type
(Btyp
);
239 Acc
: constant Entity_Id
:=
240 Etype
(Next_Component
(First_Component
(E_T
)));
244 function May_Be_External_Call
return Boolean;
245 -- If the 'Access is to a local operation, but appears in a context
246 -- where it may lead to a call from outside the object, we must treat
247 -- this as an external call. Clearly we cannot tell without full
248 -- flow analysis, and a subsequent call that uses this 'Access may
249 -- lead to a bounded error (trying to seize locks twice, e.g.). For
250 -- now we treat 'Access as a potential external call if it is an actual
251 -- in a call to an outside subprogram.
253 --------------------------
254 -- May_Be_External_Call --
255 --------------------------
257 function May_Be_External_Call
return Boolean is
259 Par
: Node_Id
:= Parent
(N
);
262 -- Account for the case where the Access attribute is part of a
263 -- named parameter association.
265 if Nkind
(Par
) = N_Parameter_Association
then
269 if Nkind_In
(Par
, N_Procedure_Call_Statement
, N_Function_Call
)
270 and then Is_Entity_Name
(Name
(Par
))
272 Subp
:= Entity
(Name
(Par
));
273 return not In_Open_Scopes
(Scope
(Subp
));
277 end May_Be_External_Call
;
279 -- Start of processing for Expand_Access_To_Protected_Op
282 -- Within the body of the protected type, the prefix
283 -- designates a local operation, and the object is the first
284 -- parameter of the corresponding protected body of the
285 -- current enclosing operation.
287 if Is_Entity_Name
(Pref
) then
288 if May_Be_External_Call
then
291 (External_Subprogram
(Entity
(Pref
)), Loc
);
295 (Protected_Body_Subprogram
(Entity
(Pref
)), Loc
);
298 -- Don't traverse the scopes when the attribute occurs within an init
299 -- proc, because we directly use the _init formal of the init proc in
302 Curr
:= Current_Scope
;
303 if not Is_Init_Proc
(Curr
) then
304 pragma Assert
(In_Open_Scopes
(Scope
(Entity
(Pref
))));
306 while Scope
(Curr
) /= Scope
(Entity
(Pref
)) loop
307 Curr
:= Scope
(Curr
);
311 -- In case of protected entries the first formal of its Protected_
312 -- Body_Subprogram is the address of the object.
314 if Ekind
(Curr
) = E_Entry
then
318 (Protected_Body_Subprogram
(Curr
)), Loc
);
320 -- If the current scope is an init proc, then use the address of the
321 -- _init formal as the object reference.
323 elsif Is_Init_Proc
(Curr
) then
325 Make_Attribute_Reference
(Loc
,
326 Prefix
=> New_Occurrence_Of
(First_Formal
(Curr
), Loc
),
327 Attribute_Name
=> Name_Address
);
329 -- In case of protected subprograms the first formal of its
330 -- Protected_Body_Subprogram is the object and we get its address.
334 Make_Attribute_Reference
(Loc
,
338 (Protected_Body_Subprogram
(Curr
)), Loc
),
339 Attribute_Name
=> Name_Address
);
342 -- Case where the prefix is not an entity name. Find the
343 -- version of the protected operation to be called from
344 -- outside the protected object.
350 (Entity
(Selector_Name
(Pref
))), Loc
);
353 Make_Attribute_Reference
(Loc
,
354 Prefix
=> Relocate_Node
(Prefix
(Pref
)),
355 Attribute_Name
=> Name_Address
);
363 Unchecked_Convert_To
(Acc
,
364 Make_Attribute_Reference
(Loc
,
366 Attribute_Name
=> Name_Address
))));
370 Analyze_And_Resolve
(N
, E_T
);
372 -- For subsequent analysis, the node must retain its type.
373 -- The backend will replace it with the equivalent type where
377 end Expand_Access_To_Protected_Op
;
379 --------------------------
380 -- Expand_Fpt_Attribute --
381 --------------------------
383 procedure Expand_Fpt_Attribute
389 Loc
: constant Source_Ptr
:= Sloc
(N
);
390 Typ
: constant Entity_Id
:= Etype
(N
);
394 -- The function name is the selected component Attr_xxx.yyy where
395 -- Attr_xxx is the package name, and yyy is the argument Nam.
397 -- Note: it would be more usual to have separate RE entries for each
398 -- of the entities in the Fat packages, but first they have identical
399 -- names (so we would have to have lots of renaming declarations to
400 -- meet the normal RE rule of separate names for all runtime entities),
401 -- and second there would be an awful lot of them!
404 Make_Selected_Component
(Loc
,
405 Prefix
=> New_Reference_To
(RTE
(Pkg
), Loc
),
406 Selector_Name
=> Make_Identifier
(Loc
, Nam
));
408 -- The generated call is given the provided set of parameters, and then
409 -- wrapped in a conversion which converts the result to the target type
410 -- We use the base type as the target because a range check may be
414 Unchecked_Convert_To
(Base_Type
(Etype
(N
)),
415 Make_Function_Call
(Loc
,
417 Parameter_Associations
=> Args
)));
419 Analyze_And_Resolve
(N
, Typ
);
420 end Expand_Fpt_Attribute
;
422 ----------------------------
423 -- Expand_Fpt_Attribute_R --
424 ----------------------------
426 -- The single argument is converted to its root type to call the
427 -- appropriate runtime function, with the actual call being built
428 -- by Expand_Fpt_Attribute
430 procedure Expand_Fpt_Attribute_R
(N
: Node_Id
) is
431 E1
: constant Node_Id
:= First
(Expressions
(N
));
435 Find_Fat_Info
(Etype
(E1
), Ftp
, Pkg
);
437 (N
, Pkg
, Attribute_Name
(N
),
438 New_List
(Unchecked_Convert_To
(Ftp
, Relocate_Node
(E1
))));
439 end Expand_Fpt_Attribute_R
;
441 -----------------------------
442 -- Expand_Fpt_Attribute_RI --
443 -----------------------------
445 -- The first argument is converted to its root type and the second
446 -- argument is converted to standard long long integer to call the
447 -- appropriate runtime function, with the actual call being built
448 -- by Expand_Fpt_Attribute
450 procedure Expand_Fpt_Attribute_RI
(N
: Node_Id
) is
451 E1
: constant Node_Id
:= First
(Expressions
(N
));
454 E2
: constant Node_Id
:= Next
(E1
);
456 Find_Fat_Info
(Etype
(E1
), Ftp
, Pkg
);
458 (N
, Pkg
, Attribute_Name
(N
),
460 Unchecked_Convert_To
(Ftp
, Relocate_Node
(E1
)),
461 Unchecked_Convert_To
(Standard_Integer
, Relocate_Node
(E2
))));
462 end Expand_Fpt_Attribute_RI
;
464 -----------------------------
465 -- Expand_Fpt_Attribute_RR --
466 -----------------------------
468 -- The two arguments are converted to their root types to call the
469 -- appropriate runtime function, with the actual call being built
470 -- by Expand_Fpt_Attribute
472 procedure Expand_Fpt_Attribute_RR
(N
: Node_Id
) is
473 E1
: constant Node_Id
:= First
(Expressions
(N
));
476 E2
: constant Node_Id
:= Next
(E1
);
478 Find_Fat_Info
(Etype
(E1
), Ftp
, Pkg
);
480 (N
, Pkg
, Attribute_Name
(N
),
482 Unchecked_Convert_To
(Ftp
, Relocate_Node
(E1
)),
483 Unchecked_Convert_To
(Ftp
, Relocate_Node
(E2
))));
484 end Expand_Fpt_Attribute_RR
;
486 ----------------------------------
487 -- Expand_N_Attribute_Reference --
488 ----------------------------------
490 procedure Expand_N_Attribute_Reference
(N
: Node_Id
) is
491 Loc
: constant Source_Ptr
:= Sloc
(N
);
492 Typ
: constant Entity_Id
:= Etype
(N
);
493 Btyp
: constant Entity_Id
:= Base_Type
(Typ
);
494 Pref
: constant Node_Id
:= Prefix
(N
);
495 Ptyp
: constant Entity_Id
:= Etype
(Pref
);
496 Exprs
: constant List_Id
:= Expressions
(N
);
497 Id
: constant Attribute_Id
:= Get_Attribute_Id
(Attribute_Name
(N
));
499 procedure Rewrite_Stream_Proc_Call
(Pname
: Entity_Id
);
500 -- Rewrites a stream attribute for Read, Write or Output with the
501 -- procedure call. Pname is the entity for the procedure to call.
503 ------------------------------
504 -- Rewrite_Stream_Proc_Call --
505 ------------------------------
507 procedure Rewrite_Stream_Proc_Call
(Pname
: Entity_Id
) is
508 Item
: constant Node_Id
:= Next
(First
(Exprs
));
509 Formal
: constant Entity_Id
:= Next_Formal
(First_Formal
(Pname
));
510 Formal_Typ
: constant Entity_Id
:= Etype
(Formal
);
511 Is_Written
: constant Boolean := (Ekind
(Formal
) /= E_In_Parameter
);
514 -- The expansion depends on Item, the second actual, which is
515 -- the object being streamed in or out.
517 -- If the item is a component of a packed array type, and
518 -- a conversion is needed on exit, we introduce a temporary to
519 -- hold the value, because otherwise the packed reference will
520 -- not be properly expanded.
522 if Nkind
(Item
) = N_Indexed_Component
523 and then Is_Packed
(Base_Type
(Etype
(Prefix
(Item
))))
524 and then Base_Type
(Etype
(Item
)) /= Base_Type
(Formal_Typ
)
528 Temp
: constant Entity_Id
:=
529 Make_Defining_Identifier
530 (Loc
, New_Internal_Name
('V'));
536 Make_Object_Declaration
(Loc
,
537 Defining_Identifier
=> Temp
,
539 New_Occurrence_Of
(Formal_Typ
, Loc
));
540 Set_Etype
(Temp
, Formal_Typ
);
543 Make_Assignment_Statement
(Loc
,
544 Name
=> New_Copy_Tree
(Item
),
547 (Etype
(Item
), New_Occurrence_Of
(Temp
, Loc
)));
549 Rewrite
(Item
, New_Occurrence_Of
(Temp
, Loc
));
553 Make_Procedure_Call_Statement
(Loc
,
554 Name
=> New_Occurrence_Of
(Pname
, Loc
),
555 Parameter_Associations
=> Exprs
),
558 Rewrite
(N
, Make_Null_Statement
(Loc
));
563 -- For the class-wide dispatching cases, and for cases in which
564 -- the base type of the second argument matches the base type of
565 -- the corresponding formal parameter (that is to say the stream
566 -- operation is not inherited), we are all set, and can use the
567 -- argument unchanged.
569 -- For all other cases we do an unchecked conversion of the second
570 -- parameter to the type of the formal of the procedure we are
571 -- calling. This deals with the private type cases, and with going
572 -- to the root type as required in elementary type case.
574 if not Is_Class_Wide_Type
(Entity
(Pref
))
575 and then not Is_Class_Wide_Type
(Etype
(Item
))
576 and then Base_Type
(Etype
(Item
)) /= Base_Type
(Formal_Typ
)
579 Unchecked_Convert_To
(Formal_Typ
, Relocate_Node
(Item
)));
581 -- For untagged derived types set Assignment_OK, to prevent
582 -- copies from being created when the unchecked conversion
583 -- is expanded (which would happen in Remove_Side_Effects
584 -- if Expand_N_Unchecked_Conversion were allowed to call
585 -- Force_Evaluation). The copy could violate Ada semantics
586 -- in cases such as an actual that is an out parameter.
587 -- Note that this approach is also used in exp_ch7 for calls
588 -- to controlled type operations to prevent problems with
589 -- actuals wrapped in unchecked conversions.
591 if Is_Untagged_Derivation
(Etype
(Expression
(Item
))) then
592 Set_Assignment_OK
(Item
);
596 -- The stream operation to call maybe a renaming created by
597 -- an attribute definition clause, and may not be frozen yet.
598 -- Ensure that it has the necessary extra formals.
600 if not Is_Frozen
(Pname
) then
601 Create_Extra_Formals
(Pname
);
604 -- And now rewrite the call
607 Make_Procedure_Call_Statement
(Loc
,
608 Name
=> New_Occurrence_Of
(Pname
, Loc
),
609 Parameter_Associations
=> Exprs
));
612 end Rewrite_Stream_Proc_Call
;
614 -- Start of processing for Expand_N_Attribute_Reference
617 -- Do required validity checking, if enabled. Do not apply check to
618 -- output parameters of an Asm instruction, since the value of this
619 -- is not set till after the attribute has been elaborated, and do
620 -- not apply the check to the arguments of a 'Read or 'Input attribute
621 -- reference since the scalar argument is an OUT scalar.
623 if Validity_Checks_On
and then Validity_Check_Operands
624 and then Id
/= Attribute_Asm_Output
625 and then Id
/= Attribute_Read
626 and then Id
/= Attribute_Input
631 Expr
:= First
(Expressions
(N
));
632 while Present
(Expr
) loop
639 -- Ada 2005 (AI-318-02): If attribute prefix is a call to a build-in-
640 -- place function, then a temporary return object needs to be created
641 -- and access to it must be passed to the function. Currently we limit
642 -- such functions to those with inherently limited result subtypes, but
643 -- eventually we plan to expand the functions that are treated as
644 -- build-in-place to include other composite result types.
646 if Ada_Version
>= Ada_05
647 and then Is_Build_In_Place_Function_Call
(Pref
)
649 Make_Build_In_Place_Call_In_Anonymous_Context
(Pref
);
652 -- If prefix is a protected type name, this is a reference to
653 -- the current instance of the type.
655 if Is_Protected_Self_Reference
(Pref
) then
656 Rewrite
(Pref
, Concurrent_Ref
(Pref
));
660 -- Remaining processing depends on specific attribute
668 when Attribute_Access |
669 Attribute_Unchecked_Access |
670 Attribute_Unrestricted_Access
=>
672 Access_Cases
: declare
673 Ref_Object
: constant Node_Id
:= Get_Referenced_Object
(Pref
);
674 Btyp_DDT
: Entity_Id
;
676 function Enclosing_Object
(N
: Node_Id
) return Node_Id
;
677 -- If N denotes a compound name (selected component, indexed
678 -- component, or slice), returns the name of the outermost
679 -- such enclosing object. Otherwise returns N. If the object
680 -- is a renaming, then the renamed object is returned.
682 ----------------------
683 -- Enclosing_Object --
684 ----------------------
686 function Enclosing_Object
(N
: Node_Id
) return Node_Id
is
691 while Nkind_In
(Obj_Name
, N_Selected_Component
,
695 Obj_Name
:= Prefix
(Obj_Name
);
698 return Get_Referenced_Object
(Obj_Name
);
699 end Enclosing_Object
;
701 -- Local declarations
703 Enc_Object
: constant Node_Id
:= Enclosing_Object
(Ref_Object
);
705 -- Start of processing for Access_Cases
708 Btyp_DDT
:= Designated_Type
(Btyp
);
710 -- Handle designated types that come from the limited view
712 if Ekind
(Btyp_DDT
) = E_Incomplete_Type
713 and then From_With_Type
(Btyp_DDT
)
714 and then Present
(Non_Limited_View
(Btyp_DDT
))
716 Btyp_DDT
:= Non_Limited_View
(Btyp_DDT
);
718 elsif Is_Class_Wide_Type
(Btyp_DDT
)
719 and then Ekind
(Etype
(Btyp_DDT
)) = E_Incomplete_Type
720 and then From_With_Type
(Etype
(Btyp_DDT
))
721 and then Present
(Non_Limited_View
(Etype
(Btyp_DDT
)))
722 and then Present
(Class_Wide_Type
723 (Non_Limited_View
(Etype
(Btyp_DDT
))))
726 Class_Wide_Type
(Non_Limited_View
(Etype
(Btyp_DDT
)));
729 -- In order to improve the text of error messages, the designated
730 -- type of access-to-subprogram itypes is set by the semantics as
731 -- the associated subprogram entity (see sem_attr). Now we replace
732 -- such node with the proper E_Subprogram_Type itype.
734 if Id
= Attribute_Unrestricted_Access
735 and then Is_Subprogram
(Directly_Designated_Type
(Typ
))
737 -- The following conditions ensure that this special management
738 -- is done only for "Address!(Prim'Unrestricted_Access)" nodes.
739 -- At this stage other cases in which the designated type is
740 -- still a subprogram (instead of an E_Subprogram_Type) are
741 -- wrong because the semantics must have overridden the type of
742 -- the node with the type imposed by the context.
744 if Nkind
(Parent
(N
)) = N_Unchecked_Type_Conversion
745 and then Etype
(Parent
(N
)) = RTE
(RE_Prim_Ptr
)
747 Set_Etype
(N
, RTE
(RE_Prim_Ptr
));
751 Subp
: constant Entity_Id
:=
752 Directly_Designated_Type
(Typ
);
754 Extra
: Entity_Id
:= Empty
;
755 New_Formal
: Entity_Id
;
756 Old_Formal
: Entity_Id
:= First_Formal
(Subp
);
757 Subp_Typ
: Entity_Id
;
760 Subp_Typ
:= Create_Itype
(E_Subprogram_Type
, N
);
761 Set_Etype
(Subp_Typ
, Etype
(Subp
));
762 Set_Returns_By_Ref
(Subp_Typ
, Returns_By_Ref
(Subp
));
764 if Present
(Old_Formal
) then
765 New_Formal
:= New_Copy
(Old_Formal
);
766 Set_First_Entity
(Subp_Typ
, New_Formal
);
769 Set_Scope
(New_Formal
, Subp_Typ
);
770 Etyp
:= Etype
(New_Formal
);
772 -- Handle itypes. There is no need to duplicate
773 -- here the itypes associated with record types
774 -- (i.e the implicit full view of private types).
777 and then Ekind
(Base_Type
(Etyp
)) /= E_Record_Type
779 Extra
:= New_Copy
(Etyp
);
780 Set_Parent
(Extra
, New_Formal
);
781 Set_Etype
(New_Formal
, Extra
);
782 Set_Scope
(Extra
, Subp_Typ
);
786 Next_Formal
(Old_Formal
);
787 exit when No
(Old_Formal
);
789 Set_Next_Entity
(New_Formal
,
790 New_Copy
(Old_Formal
));
791 Next_Entity
(New_Formal
);
794 Set_Next_Entity
(New_Formal
, Empty
);
795 Set_Last_Entity
(Subp_Typ
, Extra
);
798 -- Now that the explicit formals have been duplicated,
799 -- any extra formals needed by the subprogram must be
802 if Present
(Extra
) then
803 Set_Extra_Formal
(Extra
, Empty
);
806 Create_Extra_Formals
(Subp_Typ
);
807 Set_Directly_Designated_Type
(Typ
, Subp_Typ
);
812 if Is_Access_Protected_Subprogram_Type
(Btyp
) then
813 Expand_Access_To_Protected_Op
(N
, Pref
, Typ
);
815 -- If prefix is a type name, this is a reference to the current
816 -- instance of the type, within its initialization procedure.
818 elsif Is_Entity_Name
(Pref
)
819 and then Is_Type
(Entity
(Pref
))
826 -- If the current instance name denotes a task type, then
827 -- the access attribute is rewritten to be the name of the
828 -- "_task" parameter associated with the task type's task
829 -- procedure. An unchecked conversion is applied to ensure
830 -- a type match in cases of expander-generated calls (e.g.
833 if Is_Task_Type
(Entity
(Pref
)) then
835 First_Entity
(Get_Task_Body_Procedure
(Entity
(Pref
)));
836 while Present
(Formal
) loop
837 exit when Chars
(Formal
) = Name_uTask
;
838 Next_Entity
(Formal
);
841 pragma Assert
(Present
(Formal
));
844 Unchecked_Convert_To
(Typ
,
845 New_Occurrence_Of
(Formal
, Loc
)));
848 -- The expression must appear in a default expression,
849 -- (which in the initialization procedure is the
850 -- right-hand side of an assignment), and not in a
851 -- discriminant constraint.
855 while Present
(Par
) loop
856 exit when Nkind
(Par
) = N_Assignment_Statement
;
858 if Nkind
(Par
) = N_Component_Declaration
then
865 if Present
(Par
) then
867 Make_Attribute_Reference
(Loc
,
868 Prefix
=> Make_Identifier
(Loc
, Name_uInit
),
869 Attribute_Name
=> Attribute_Name
(N
)));
871 Analyze_And_Resolve
(N
, Typ
);
876 -- If the prefix of an Access attribute is a dereference of an
877 -- access parameter (or a renaming of such a dereference, or a
878 -- subcomponent of such a dereference) and the context is a
879 -- general access type (including the type of an object or
880 -- component with an access_definition, but not the anonymous
881 -- type of an access parameter or access discriminant), then
882 -- apply an accessibility check to the access parameter. We used
883 -- to rewrite the access parameter as a type conversion, but that
884 -- could only be done if the immediate prefix of the Access
885 -- attribute was the dereference, and didn't handle cases where
886 -- the attribute is applied to a subcomponent of the dereference,
887 -- since there's generally no available, appropriate access type
888 -- to convert to in that case. The attribute is passed as the
889 -- point to insert the check, because the access parameter may
890 -- come from a renaming, possibly in a different scope, and the
891 -- check must be associated with the attribute itself.
893 elsif Id
= Attribute_Access
894 and then Nkind
(Enc_Object
) = N_Explicit_Dereference
895 and then Is_Entity_Name
(Prefix
(Enc_Object
))
896 and then (Ekind
(Btyp
) = E_General_Access_Type
897 or else Is_Local_Anonymous_Access
(Btyp
))
898 and then Ekind
(Entity
(Prefix
(Enc_Object
))) in Formal_Kind
899 and then Ekind
(Etype
(Entity
(Prefix
(Enc_Object
))))
900 = E_Anonymous_Access_Type
901 and then Present
(Extra_Accessibility
902 (Entity
(Prefix
(Enc_Object
))))
904 Apply_Accessibility_Check
(Prefix
(Enc_Object
), Typ
, N
);
906 -- Ada 2005 (AI-251): If the designated type is an interface we
907 -- add an implicit conversion to force the displacement of the
908 -- pointer to reference the secondary dispatch table.
910 elsif Is_Interface
(Btyp_DDT
)
911 and then (Comes_From_Source
(N
)
912 or else Comes_From_Source
(Ref_Object
)
913 or else (Nkind
(Ref_Object
) in N_Has_Chars
914 and then Chars
(Ref_Object
) = Name_uInit
))
916 if Nkind
(Ref_Object
) /= N_Explicit_Dereference
then
918 -- No implicit conversion required if types match, or if
919 -- the prefix is the class_wide_type of the interface. In
920 -- either case passing an object of the interface type has
921 -- already set the pointer correctly.
923 if Btyp_DDT
= Etype
(Ref_Object
)
924 or else (Is_Class_Wide_Type
(Etype
(Ref_Object
))
926 Class_Wide_Type
(Btyp_DDT
) = Etype
(Ref_Object
))
932 Convert_To
(Btyp_DDT
,
933 New_Copy_Tree
(Prefix
(N
))));
935 Analyze_And_Resolve
(Prefix
(N
), Btyp_DDT
);
938 -- When the object is an explicit dereference, convert the
939 -- dereference's prefix.
943 Obj_DDT
: constant Entity_Id
:=
945 (Directly_Designated_Type
946 (Etype
(Prefix
(Ref_Object
))));
948 -- No implicit conversion required if designated types
951 if Obj_DDT
/= Btyp_DDT
952 and then not (Is_Class_Wide_Type
(Obj_DDT
)
953 and then Etype
(Obj_DDT
) = Btyp_DDT
)
957 New_Copy_Tree
(Prefix
(Ref_Object
))));
958 Analyze_And_Resolve
(N
, Typ
);
969 -- Transforms 'Adjacent into a call to the floating-point attribute
970 -- function Adjacent in Fat_xxx (where xxx is the root type)
972 when Attribute_Adjacent
=>
973 Expand_Fpt_Attribute_RR
(N
);
979 when Attribute_Address
=> Address
: declare
980 Task_Proc
: Entity_Id
;
983 -- If the prefix is a task or a task type, the useful address is that
984 -- of the procedure for the task body, i.e. the actual program unit.
985 -- We replace the original entity with that of the procedure.
987 if Is_Entity_Name
(Pref
)
988 and then Is_Task_Type
(Entity
(Pref
))
990 Task_Proc
:= Next_Entity
(Root_Type
(Ptyp
));
992 while Present
(Task_Proc
) loop
993 exit when Ekind
(Task_Proc
) = E_Procedure
994 and then Etype
(First_Formal
(Task_Proc
)) =
995 Corresponding_Record_Type
(Ptyp
);
996 Next_Entity
(Task_Proc
);
999 if Present
(Task_Proc
) then
1000 Set_Entity
(Pref
, Task_Proc
);
1001 Set_Etype
(Pref
, Etype
(Task_Proc
));
1004 -- Similarly, the address of a protected operation is the address
1005 -- of the corresponding protected body, regardless of the protected
1006 -- object from which it is selected.
1008 elsif Nkind
(Pref
) = N_Selected_Component
1009 and then Is_Subprogram
(Entity
(Selector_Name
(Pref
)))
1010 and then Is_Protected_Type
(Scope
(Entity
(Selector_Name
(Pref
))))
1014 External_Subprogram
(Entity
(Selector_Name
(Pref
))), Loc
));
1016 elsif Nkind
(Pref
) = N_Explicit_Dereference
1017 and then Ekind
(Ptyp
) = E_Subprogram_Type
1018 and then Convention
(Ptyp
) = Convention_Protected
1020 -- The prefix is be a dereference of an access_to_protected_
1021 -- subprogram. The desired address is the second component of
1022 -- the record that represents the access.
1025 Addr
: constant Entity_Id
:= Etype
(N
);
1026 Ptr
: constant Node_Id
:= Prefix
(Pref
);
1027 T
: constant Entity_Id
:=
1028 Equivalent_Type
(Base_Type
(Etype
(Ptr
)));
1032 Unchecked_Convert_To
(Addr
,
1033 Make_Selected_Component
(Loc
,
1034 Prefix
=> Unchecked_Convert_To
(T
, Ptr
),
1035 Selector_Name
=> New_Occurrence_Of
(
1036 Next_Entity
(First_Entity
(T
)), Loc
))));
1038 Analyze_And_Resolve
(N
, Addr
);
1041 -- Ada 2005 (AI-251): Class-wide interface objects are always
1042 -- "displaced" to reference the tag associated with the interface
1043 -- type. In order to obtain the real address of such objects we
1044 -- generate a call to a run-time subprogram that returns the base
1045 -- address of the object.
1047 -- This processing is not needed in the VM case, where dispatching
1048 -- issues are taken care of by the virtual machine.
1050 elsif Is_Class_Wide_Type
(Ptyp
)
1051 and then Is_Interface
(Ptyp
)
1052 and then Tagged_Type_Expansion
1053 and then not (Nkind
(Pref
) in N_Has_Entity
1054 and then Is_Subprogram
(Entity
(Pref
)))
1057 Make_Function_Call
(Loc
,
1058 Name
=> New_Reference_To
(RTE
(RE_Base_Address
), Loc
),
1059 Parameter_Associations
=> New_List
(
1060 Relocate_Node
(N
))));
1065 -- Deal with packed array reference, other cases are handled by
1068 if Involves_Packed_Array_Reference
(Pref
) then
1069 Expand_Packed_Address_Reference
(N
);
1077 when Attribute_Alignment
=> Alignment
: declare
1081 -- For class-wide types, X'Class'Alignment is transformed into a
1082 -- direct reference to the Alignment of the class type, so that the
1083 -- back end does not have to deal with the X'Class'Alignment
1086 if Is_Entity_Name
(Pref
)
1087 and then Is_Class_Wide_Type
(Entity
(Pref
))
1089 Rewrite
(Prefix
(N
), New_Occurrence_Of
(Entity
(Pref
), Loc
));
1092 -- For x'Alignment applied to an object of a class wide type,
1093 -- transform X'Alignment into a call to the predefined primitive
1094 -- operation _Alignment applied to X.
1096 elsif Is_Class_Wide_Type
(Ptyp
) then
1098 -- No need to do anything else compiling under restriction
1099 -- No_Dispatching_Calls. During the semantic analysis we
1100 -- already notified such violation.
1102 if Restriction_Active
(No_Dispatching_Calls
) then
1107 Make_Function_Call
(Loc
,
1108 Name
=> New_Reference_To
1109 (Find_Prim_Op
(Ptyp
, Name_uAlignment
), Loc
),
1110 Parameter_Associations
=> New_List
(Pref
));
1112 if Typ
/= Standard_Integer
then
1114 -- The context is a specific integer type with which the
1115 -- original attribute was compatible. The function has a
1116 -- specific type as well, so to preserve the compatibility
1117 -- we must convert explicitly.
1119 New_Node
:= Convert_To
(Typ
, New_Node
);
1122 Rewrite
(N
, New_Node
);
1123 Analyze_And_Resolve
(N
, Typ
);
1126 -- For all other cases, we just have to deal with the case of
1127 -- the fact that the result can be universal.
1130 Apply_Universal_Integer_Attribute_Checks
(N
);
1138 when Attribute_AST_Entry
=> AST_Entry
: declare
1143 Entry_Ref
: Node_Id
;
1144 -- The reference to the entry or entry family
1147 -- The index expression for an entry family reference, or
1148 -- the Empty if Entry_Ref references a simple entry.
1151 if Nkind
(Pref
) = N_Indexed_Component
then
1152 Entry_Ref
:= Prefix
(Pref
);
1153 Index
:= First
(Expressions
(Pref
));
1159 -- Get expression for Task_Id and the entry entity
1161 if Nkind
(Entry_Ref
) = N_Selected_Component
then
1163 Make_Attribute_Reference
(Loc
,
1164 Attribute_Name
=> Name_Identity
,
1165 Prefix
=> Prefix
(Entry_Ref
));
1167 Ttyp
:= Etype
(Prefix
(Entry_Ref
));
1168 Eent
:= Entity
(Selector_Name
(Entry_Ref
));
1172 Make_Function_Call
(Loc
,
1173 Name
=> New_Occurrence_Of
(RTE
(RE_Current_Task
), Loc
));
1175 Eent
:= Entity
(Entry_Ref
);
1177 -- We have to find the enclosing task to get the task type
1178 -- There must be one, since we already validated this earlier
1180 Ttyp
:= Current_Scope
;
1181 while not Is_Task_Type
(Ttyp
) loop
1182 Ttyp
:= Scope
(Ttyp
);
1186 -- Now rewrite the attribute with a call to Create_AST_Handler
1189 Make_Function_Call
(Loc
,
1190 Name
=> New_Occurrence_Of
(RTE
(RE_Create_AST_Handler
), Loc
),
1191 Parameter_Associations
=> New_List
(
1193 Entry_Index_Expression
(Loc
, Eent
, Index
, Ttyp
))));
1195 Analyze_And_Resolve
(N
, RTE
(RE_AST_Handler
));
1202 -- We compute this if a component clause was present, otherwise we leave
1203 -- the computation up to the back end, since we don't know what layout
1206 -- Note that the attribute can apply to a naked record component
1207 -- in generated code (i.e. the prefix is an identifier that
1208 -- references the component or discriminant entity).
1210 when Attribute_Bit_Position
=> Bit_Position
:
1215 if Nkind
(Pref
) = N_Identifier
then
1216 CE
:= Entity
(Pref
);
1218 CE
:= Entity
(Selector_Name
(Pref
));
1221 if Known_Static_Component_Bit_Offset
(CE
) then
1223 Make_Integer_Literal
(Loc
,
1224 Intval
=> Component_Bit_Offset
(CE
)));
1225 Analyze_And_Resolve
(N
, Typ
);
1228 Apply_Universal_Integer_Attribute_Checks
(N
);
1236 -- A reference to P'Body_Version or P'Version is expanded to
1239 -- pragma Import (C, Vnn, "uuuuT");
1241 -- Get_Version_String (Vnn)
1243 -- where uuuu is the unit name (dots replaced by double underscore)
1244 -- and T is B for the cases of Body_Version, or Version applied to a
1245 -- subprogram acting as its own spec, and S for Version applied to a
1246 -- subprogram spec or package. This sequence of code references the
1247 -- the unsigned constant created in the main program by the binder.
1249 -- A special exception occurs for Standard, where the string
1250 -- returned is a copy of the library string in gnatvsn.ads.
1252 when Attribute_Body_Version | Attribute_Version
=> Version
: declare
1253 E
: constant Entity_Id
:=
1254 Make_Defining_Identifier
(Loc
, New_Internal_Name
('V'));
1259 -- If not library unit, get to containing library unit
1261 Pent
:= Entity
(Pref
);
1262 while Pent
/= Standard_Standard
1263 and then Scope
(Pent
) /= Standard_Standard
1264 and then not Is_Child_Unit
(Pent
)
1266 Pent
:= Scope
(Pent
);
1269 -- Special case Standard and Standard.ASCII
1271 if Pent
= Standard_Standard
or else Pent
= Standard_ASCII
then
1273 Make_String_Literal
(Loc
,
1274 Strval
=> Verbose_Library_Version
));
1279 -- Build required string constant
1281 Get_Name_String
(Get_Unit_Name
(Pent
));
1284 for J
in 1 .. Name_Len
- 2 loop
1285 if Name_Buffer
(J
) = '.' then
1286 Store_String_Chars
("__");
1288 Store_String_Char
(Get_Char_Code
(Name_Buffer
(J
)));
1292 -- Case of subprogram acting as its own spec, always use body
1294 if Nkind
(Declaration_Node
(Pent
)) in N_Subprogram_Specification
1295 and then Nkind
(Parent
(Declaration_Node
(Pent
))) =
1297 and then Acts_As_Spec
(Parent
(Declaration_Node
(Pent
)))
1299 Store_String_Chars
("B");
1301 -- Case of no body present, always use spec
1303 elsif not Unit_Requires_Body
(Pent
) then
1304 Store_String_Chars
("S");
1306 -- Otherwise use B for Body_Version, S for spec
1308 elsif Id
= Attribute_Body_Version
then
1309 Store_String_Chars
("B");
1311 Store_String_Chars
("S");
1315 Lib
.Version_Referenced
(S
);
1317 -- Insert the object declaration
1319 Insert_Actions
(N
, New_List
(
1320 Make_Object_Declaration
(Loc
,
1321 Defining_Identifier
=> E
,
1322 Object_Definition
=>
1323 New_Occurrence_Of
(RTE
(RE_Unsigned
), Loc
))));
1325 -- Set entity as imported with correct external name
1327 Set_Is_Imported
(E
);
1328 Set_Interface_Name
(E
, Make_String_Literal
(Loc
, S
));
1330 -- Set entity as internal to ensure proper Sprint output of its
1331 -- implicit importation.
1333 Set_Is_Internal
(E
);
1335 -- And now rewrite original reference
1338 Make_Function_Call
(Loc
,
1339 Name
=> New_Reference_To
(RTE
(RE_Get_Version_String
), Loc
),
1340 Parameter_Associations
=> New_List
(
1341 New_Occurrence_Of
(E
, Loc
))));
1344 Analyze_And_Resolve
(N
, RTE
(RE_Version_String
));
1351 -- Transforms 'Ceiling into a call to the floating-point attribute
1352 -- function Ceiling in Fat_xxx (where xxx is the root type)
1354 when Attribute_Ceiling
=>
1355 Expand_Fpt_Attribute_R
(N
);
1361 -- Transforms 'Callable attribute into a call to the Callable function
1363 when Attribute_Callable
=> Callable
:
1365 -- We have an object of a task interface class-wide type as a prefix
1366 -- to Callable. Generate:
1367 -- callable (Task_Id (Pref._disp_get_task_id));
1369 if Ada_Version
>= Ada_05
1370 and then Ekind
(Ptyp
) = E_Class_Wide_Type
1371 and then Is_Interface
(Ptyp
)
1372 and then Is_Task_Interface
(Ptyp
)
1375 Make_Function_Call
(Loc
,
1377 New_Reference_To
(RTE
(RE_Callable
), Loc
),
1378 Parameter_Associations
=> New_List
(
1379 Make_Unchecked_Type_Conversion
(Loc
,
1381 New_Reference_To
(RTE
(RO_ST_Task_Id
), Loc
),
1383 Make_Selected_Component
(Loc
,
1385 New_Copy_Tree
(Pref
),
1387 Make_Identifier
(Loc
, Name_uDisp_Get_Task_Id
))))));
1391 Build_Call_With_Task
(Pref
, RTE
(RE_Callable
)));
1394 Analyze_And_Resolve
(N
, Standard_Boolean
);
1401 -- Transforms 'Caller attribute into a call to either the
1402 -- Task_Entry_Caller or the Protected_Entry_Caller function.
1404 when Attribute_Caller
=> Caller
: declare
1405 Id_Kind
: constant Entity_Id
:= RTE
(RO_AT_Task_Id
);
1406 Ent
: constant Entity_Id
:= Entity
(Pref
);
1407 Conctype
: constant Entity_Id
:= Scope
(Ent
);
1408 Nest_Depth
: Integer := 0;
1415 if Is_Protected_Type
(Conctype
) then
1416 case Corresponding_Runtime_Package
(Conctype
) is
1417 when System_Tasking_Protected_Objects_Entries
=>
1420 (RTE
(RE_Protected_Entry_Caller
), Loc
);
1422 when System_Tasking_Protected_Objects_Single_Entry
=>
1425 (RTE
(RE_Protected_Single_Entry_Caller
), Loc
);
1428 raise Program_Error
;
1432 Unchecked_Convert_To
(Id_Kind
,
1433 Make_Function_Call
(Loc
,
1435 Parameter_Associations
=> New_List
(
1437 (Find_Protection_Object
(Current_Scope
), Loc
)))));
1442 -- Determine the nesting depth of the E'Caller attribute, that
1443 -- is, how many accept statements are nested within the accept
1444 -- statement for E at the point of E'Caller. The runtime uses
1445 -- this depth to find the specified entry call.
1447 for J
in reverse 0 .. Scope_Stack
.Last
loop
1448 S
:= Scope_Stack
.Table
(J
).Entity
;
1450 -- We should not reach the scope of the entry, as it should
1451 -- already have been checked in Sem_Attr that this attribute
1452 -- reference is within a matching accept statement.
1454 pragma Assert
(S
/= Conctype
);
1459 elsif Is_Entry
(S
) then
1460 Nest_Depth
:= Nest_Depth
+ 1;
1465 Unchecked_Convert_To
(Id_Kind
,
1466 Make_Function_Call
(Loc
,
1468 New_Reference_To
(RTE
(RE_Task_Entry_Caller
), Loc
),
1469 Parameter_Associations
=> New_List
(
1470 Make_Integer_Literal
(Loc
,
1471 Intval
=> Int
(Nest_Depth
))))));
1474 Analyze_And_Resolve
(N
, Id_Kind
);
1481 -- Transforms 'Compose into a call to the floating-point attribute
1482 -- function Compose in Fat_xxx (where xxx is the root type)
1484 -- Note: we strictly should have special code here to deal with the
1485 -- case of absurdly negative arguments (less than Integer'First)
1486 -- which will return a (signed) zero value, but it hardly seems
1487 -- worth the effort. Absurdly large positive arguments will raise
1488 -- constraint error which is fine.
1490 when Attribute_Compose
=>
1491 Expand_Fpt_Attribute_RI
(N
);
1497 when Attribute_Constrained
=> Constrained
: declare
1498 Formal_Ent
: constant Entity_Id
:= Param_Entity
(Pref
);
1500 function Is_Constrained_Aliased_View
(Obj
: Node_Id
) return Boolean;
1501 -- Ada 2005 (AI-363): Returns True if the object name Obj denotes a
1502 -- view of an aliased object whose subtype is constrained.
1504 ---------------------------------
1505 -- Is_Constrained_Aliased_View --
1506 ---------------------------------
1508 function Is_Constrained_Aliased_View
(Obj
: Node_Id
) return Boolean is
1512 if Is_Entity_Name
(Obj
) then
1515 if Present
(Renamed_Object
(E
)) then
1516 return Is_Constrained_Aliased_View
(Renamed_Object
(E
));
1518 return Is_Aliased
(E
) and then Is_Constrained
(Etype
(E
));
1522 return Is_Aliased_View
(Obj
)
1524 (Is_Constrained
(Etype
(Obj
))
1525 or else (Nkind
(Obj
) = N_Explicit_Dereference
1527 not Has_Constrained_Partial_View
1528 (Base_Type
(Etype
(Obj
)))));
1530 end Is_Constrained_Aliased_View
;
1532 -- Start of processing for Constrained
1535 -- Reference to a parameter where the value is passed as an extra
1536 -- actual, corresponding to the extra formal referenced by the
1537 -- Extra_Constrained field of the corresponding formal. If this
1538 -- is an entry in-parameter, it is replaced by a constant renaming
1539 -- for which Extra_Constrained is never created.
1541 if Present
(Formal_Ent
)
1542 and then Ekind
(Formal_Ent
) /= E_Constant
1543 and then Present
(Extra_Constrained
(Formal_Ent
))
1547 (Extra_Constrained
(Formal_Ent
), Sloc
(N
)));
1549 -- For variables with a Extra_Constrained field, we use the
1550 -- corresponding entity.
1552 elsif Nkind
(Pref
) = N_Identifier
1553 and then Ekind
(Entity
(Pref
)) = E_Variable
1554 and then Present
(Extra_Constrained
(Entity
(Pref
)))
1558 (Extra_Constrained
(Entity
(Pref
)), Sloc
(N
)));
1560 -- For all other entity names, we can tell at compile time
1562 elsif Is_Entity_Name
(Pref
) then
1564 Ent
: constant Entity_Id
:= Entity
(Pref
);
1568 -- (RM J.4) obsolescent cases
1570 if Is_Type
(Ent
) then
1574 if Is_Private_Type
(Ent
) then
1575 Res
:= not Has_Discriminants
(Ent
)
1576 or else Is_Constrained
(Ent
);
1578 -- It not a private type, must be a generic actual type
1579 -- that corresponded to a private type. We know that this
1580 -- correspondence holds, since otherwise the reference
1581 -- within the generic template would have been illegal.
1584 if Is_Composite_Type
(Underlying_Type
(Ent
)) then
1585 Res
:= Is_Constrained
(Ent
);
1591 -- If the prefix is not a variable or is aliased, then
1592 -- definitely true; if it's a formal parameter without an
1593 -- associated extra formal, then treat it as constrained.
1595 -- Ada 2005 (AI-363): An aliased prefix must be known to be
1596 -- constrained in order to set the attribute to True.
1598 elsif not Is_Variable
(Pref
)
1599 or else Present
(Formal_Ent
)
1600 or else (Ada_Version
< Ada_05
1601 and then Is_Aliased_View
(Pref
))
1602 or else (Ada_Version
>= Ada_05
1603 and then Is_Constrained_Aliased_View
(Pref
))
1607 -- Variable case, look at type to see if it is constrained.
1608 -- Note that the one case where this is not accurate (the
1609 -- procedure formal case), has been handled above.
1611 -- We use the Underlying_Type here (and below) in case the
1612 -- type is private without discriminants, but the full type
1613 -- has discriminants. This case is illegal, but we generate it
1614 -- internally for passing to the Extra_Constrained parameter.
1617 Res
:= Is_Constrained
(Underlying_Type
(Etype
(Ent
)));
1621 New_Reference_To
(Boolean_Literals
(Res
), Loc
));
1624 -- Prefix is not an entity name. These are also cases where we can
1625 -- always tell at compile time by looking at the form and type of the
1626 -- prefix. If an explicit dereference of an object with constrained
1627 -- partial view, this is unconstrained (Ada 2005 AI-363).
1633 not Is_Variable
(Pref
)
1635 (Nkind
(Pref
) = N_Explicit_Dereference
1637 not Has_Constrained_Partial_View
(Base_Type
(Ptyp
)))
1638 or else Is_Constrained
(Underlying_Type
(Ptyp
))),
1642 Analyze_And_Resolve
(N
, Standard_Boolean
);
1649 -- Transforms 'Copy_Sign into a call to the floating-point attribute
1650 -- function Copy_Sign in Fat_xxx (where xxx is the root type)
1652 when Attribute_Copy_Sign
=>
1653 Expand_Fpt_Attribute_RR
(N
);
1659 -- Transforms 'Count attribute into a call to the Count function
1661 when Attribute_Count
=> Count
: declare
1663 Conctyp
: Entity_Id
;
1665 Entry_Id
: Entity_Id
;
1670 -- If the prefix is a member of an entry family, retrieve both
1671 -- entry name and index. For a simple entry there is no index.
1673 if Nkind
(Pref
) = N_Indexed_Component
then
1674 Entnam
:= Prefix
(Pref
);
1675 Index
:= First
(Expressions
(Pref
));
1681 Entry_Id
:= Entity
(Entnam
);
1683 -- Find the concurrent type in which this attribute is referenced
1684 -- (there had better be one).
1686 Conctyp
:= Current_Scope
;
1687 while not Is_Concurrent_Type
(Conctyp
) loop
1688 Conctyp
:= Scope
(Conctyp
);
1693 if Is_Protected_Type
(Conctyp
) then
1694 case Corresponding_Runtime_Package
(Conctyp
) is
1695 when System_Tasking_Protected_Objects_Entries
=>
1696 Name
:= New_Reference_To
(RTE
(RE_Protected_Count
), Loc
);
1699 Make_Function_Call
(Loc
,
1701 Parameter_Associations
=> New_List
(
1703 (Find_Protection_Object
(Current_Scope
), Loc
),
1704 Entry_Index_Expression
1705 (Loc
, Entry_Id
, Index
, Scope
(Entry_Id
))));
1707 when System_Tasking_Protected_Objects_Single_Entry
=>
1709 New_Reference_To
(RTE
(RE_Protected_Count_Entry
), Loc
);
1712 Make_Function_Call
(Loc
,
1714 Parameter_Associations
=> New_List
(
1716 (Find_Protection_Object
(Current_Scope
), Loc
)));
1719 raise Program_Error
;
1726 Make_Function_Call
(Loc
,
1727 Name
=> New_Reference_To
(RTE
(RE_Task_Count
), Loc
),
1728 Parameter_Associations
=> New_List
(
1729 Entry_Index_Expression
(Loc
,
1730 Entry_Id
, Index
, Scope
(Entry_Id
))));
1733 -- The call returns type Natural but the context is universal integer
1734 -- so any integer type is allowed. The attribute was already resolved
1735 -- so its Etype is the required result type. If the base type of the
1736 -- context type is other than Standard.Integer we put in a conversion
1737 -- to the required type. This can be a normal typed conversion since
1738 -- both input and output types of the conversion are integer types
1740 if Base_Type
(Typ
) /= Base_Type
(Standard_Integer
) then
1741 Rewrite
(N
, Convert_To
(Typ
, Call
));
1746 Analyze_And_Resolve
(N
, Typ
);
1753 -- This processing is shared by Elab_Spec
1755 -- What we do is to insert the following declarations
1758 -- pragma Import (C, enn, "name___elabb/s");
1760 -- and then the Elab_Body/Spec attribute is replaced by a reference
1761 -- to this defining identifier.
1763 when Attribute_Elab_Body |
1764 Attribute_Elab_Spec
=>
1767 Ent
: constant Entity_Id
:=
1768 Make_Defining_Identifier
(Loc
,
1769 New_Internal_Name
('E'));
1773 procedure Make_Elab_String
(Nod
: Node_Id
);
1774 -- Given Nod, an identifier, or a selected component, put the
1775 -- image into the current string literal, with double underline
1776 -- between components.
1778 ----------------------
1779 -- Make_Elab_String --
1780 ----------------------
1782 procedure Make_Elab_String
(Nod
: Node_Id
) is
1784 if Nkind
(Nod
) = N_Selected_Component
then
1785 Make_Elab_String
(Prefix
(Nod
));
1789 Store_String_Char
('$');
1791 Store_String_Char
('.');
1793 Store_String_Char
('_');
1794 Store_String_Char
('_');
1797 Get_Name_String
(Chars
(Selector_Name
(Nod
)));
1800 pragma Assert
(Nkind
(Nod
) = N_Identifier
);
1801 Get_Name_String
(Chars
(Nod
));
1804 Store_String_Chars
(Name_Buffer
(1 .. Name_Len
));
1805 end Make_Elab_String
;
1807 -- Start of processing for Elab_Body/Elab_Spec
1810 -- First we need to prepare the string literal for the name of
1811 -- the elaboration routine to be referenced.
1814 Make_Elab_String
(Pref
);
1816 if VM_Target
= No_VM
then
1817 Store_String_Chars
("___elab");
1818 Lang
:= Make_Identifier
(Loc
, Name_C
);
1820 Store_String_Chars
("._elab");
1821 Lang
:= Make_Identifier
(Loc
, Name_Ada
);
1824 if Id
= Attribute_Elab_Body
then
1825 Store_String_Char
('b');
1827 Store_String_Char
('s');
1832 Insert_Actions
(N
, New_List
(
1833 Make_Subprogram_Declaration
(Loc
,
1835 Make_Procedure_Specification
(Loc
,
1836 Defining_Unit_Name
=> Ent
)),
1839 Chars
=> Name_Import
,
1840 Pragma_Argument_Associations
=> New_List
(
1841 Make_Pragma_Argument_Association
(Loc
,
1842 Expression
=> Lang
),
1844 Make_Pragma_Argument_Association
(Loc
,
1846 Make_Identifier
(Loc
, Chars
(Ent
))),
1848 Make_Pragma_Argument_Association
(Loc
,
1850 Make_String_Literal
(Loc
, Str
))))));
1852 Set_Entity
(N
, Ent
);
1853 Rewrite
(N
, New_Occurrence_Of
(Ent
, Loc
));
1860 -- Elaborated is always True for preelaborated units, predefined units,
1861 -- pure units and units which have Elaborate_Body pragmas. These units
1862 -- have no elaboration entity.
1864 -- Note: The Elaborated attribute is never passed to the back end
1866 when Attribute_Elaborated
=> Elaborated
: declare
1867 Ent
: constant Entity_Id
:= Entity
(Pref
);
1870 if Present
(Elaboration_Entity
(Ent
)) then
1872 New_Occurrence_Of
(Elaboration_Entity
(Ent
), Loc
));
1874 Rewrite
(N
, New_Occurrence_Of
(Standard_True
, Loc
));
1882 when Attribute_Enum_Rep
=> Enum_Rep
:
1884 -- X'Enum_Rep (Y) expands to
1888 -- This is simply a direct conversion from the enumeration type to
1889 -- the target integer type, which is treated by the back end as a
1890 -- normal integer conversion, treating the enumeration type as an
1891 -- integer, which is exactly what we want! We set Conversion_OK to
1892 -- make sure that the analyzer does not complain about what otherwise
1893 -- might be an illegal conversion.
1895 if Is_Non_Empty_List
(Exprs
) then
1897 OK_Convert_To
(Typ
, Relocate_Node
(First
(Exprs
))));
1899 -- X'Enum_Rep where X is an enumeration literal is replaced by
1900 -- the literal value.
1902 elsif Ekind
(Entity
(Pref
)) = E_Enumeration_Literal
then
1904 Make_Integer_Literal
(Loc
, Enumeration_Rep
(Entity
(Pref
))));
1906 -- If this is a renaming of a literal, recover the representation
1909 elsif Ekind
(Entity
(Pref
)) = E_Constant
1910 and then Present
(Renamed_Object
(Entity
(Pref
)))
1912 Ekind
(Entity
(Renamed_Object
(Entity
(Pref
))))
1913 = E_Enumeration_Literal
1916 Make_Integer_Literal
(Loc
,
1917 Enumeration_Rep
(Entity
(Renamed_Object
(Entity
(Pref
))))));
1919 -- X'Enum_Rep where X is an object does a direct unchecked conversion
1920 -- of the object value, as described for the type case above.
1924 OK_Convert_To
(Typ
, Relocate_Node
(Pref
)));
1928 Analyze_And_Resolve
(N
, Typ
);
1935 when Attribute_Enum_Val
=> Enum_Val
: declare
1937 Btyp
: constant Entity_Id
:= Base_Type
(Ptyp
);
1940 -- X'Enum_Val (Y) expands to
1942 -- [constraint_error when _rep_to_pos (Y, False) = -1, msg]
1945 Expr
:= Unchecked_Convert_To
(Ptyp
, First
(Exprs
));
1948 Make_Raise_Constraint_Error
(Loc
,
1952 Make_Function_Call
(Loc
,
1954 New_Reference_To
(TSS
(Btyp
, TSS_Rep_To_Pos
), Loc
),
1955 Parameter_Associations
=> New_List
(
1956 Relocate_Node
(Duplicate_Subexpr
(Expr
)),
1957 New_Occurrence_Of
(Standard_False
, Loc
))),
1959 Right_Opnd
=> Make_Integer_Literal
(Loc
, -1)),
1960 Reason
=> CE_Range_Check_Failed
));
1963 Analyze_And_Resolve
(N
, Ptyp
);
1970 -- Transforms 'Exponent into a call to the floating-point attribute
1971 -- function Exponent in Fat_xxx (where xxx is the root type)
1973 when Attribute_Exponent
=>
1974 Expand_Fpt_Attribute_R
(N
);
1980 -- transforme X'External_Tag into Ada.Tags.External_Tag (X'tag)
1982 when Attribute_External_Tag
=> External_Tag
:
1985 Make_Function_Call
(Loc
,
1986 Name
=> New_Reference_To
(RTE
(RE_External_Tag
), Loc
),
1987 Parameter_Associations
=> New_List
(
1988 Make_Attribute_Reference
(Loc
,
1989 Attribute_Name
=> Name_Tag
,
1990 Prefix
=> Prefix
(N
)))));
1992 Analyze_And_Resolve
(N
, Standard_String
);
1999 when Attribute_First
=>
2001 -- If the prefix type is a constrained packed array type which
2002 -- already has a Packed_Array_Type representation defined, then
2003 -- replace this attribute with a direct reference to 'First of the
2004 -- appropriate index subtype (since otherwise the back end will try
2005 -- to give us the value of 'First for this implementation type).
2007 if Is_Constrained_Packed_Array
(Ptyp
) then
2009 Make_Attribute_Reference
(Loc
,
2010 Attribute_Name
=> Name_First
,
2011 Prefix
=> New_Reference_To
(Get_Index_Subtype
(N
), Loc
)));
2012 Analyze_And_Resolve
(N
, Typ
);
2014 elsif Is_Access_Type
(Ptyp
) then
2015 Apply_Access_Check
(N
);
2022 -- Compute this if component clause was present, otherwise we leave the
2023 -- computation to be completed in the back-end, since we don't know what
2024 -- layout will be chosen.
2026 when Attribute_First_Bit
=> First_Bit
: declare
2027 CE
: constant Entity_Id
:= Entity
(Selector_Name
(Pref
));
2030 if Known_Static_Component_Bit_Offset
(CE
) then
2032 Make_Integer_Literal
(Loc
,
2033 Component_Bit_Offset
(CE
) mod System_Storage_Unit
));
2035 Analyze_And_Resolve
(N
, Typ
);
2038 Apply_Universal_Integer_Attribute_Checks
(N
);
2048 -- fixtype'Fixed_Value (integer-value)
2052 -- fixtype(integer-value)
2054 -- We do all the required analysis of the conversion here, because we do
2055 -- not want this to go through the fixed-point conversion circuits. Note
2056 -- that the back end always treats fixed-point as equivalent to the
2057 -- corresponding integer type anyway.
2059 when Attribute_Fixed_Value
=> Fixed_Value
:
2062 Make_Type_Conversion
(Loc
,
2063 Subtype_Mark
=> New_Occurrence_Of
(Entity
(Pref
), Loc
),
2064 Expression
=> Relocate_Node
(First
(Exprs
))));
2065 Set_Etype
(N
, Entity
(Pref
));
2068 -- Note: it might appear that a properly analyzed unchecked conversion
2069 -- would be just fine here, but that's not the case, since the full
2070 -- range checks performed by the following call are critical!
2072 Apply_Type_Conversion_Checks
(N
);
2079 -- Transforms 'Floor into a call to the floating-point attribute
2080 -- function Floor in Fat_xxx (where xxx is the root type)
2082 when Attribute_Floor
=>
2083 Expand_Fpt_Attribute_R
(N
);
2089 -- For the fixed-point type Typ:
2095 -- Result_Type (System.Fore (Universal_Real (Type'First)),
2096 -- Universal_Real (Type'Last))
2098 -- Note that we know that the type is a non-static subtype, or Fore
2099 -- would have itself been computed dynamically in Eval_Attribute.
2101 when Attribute_Fore
=> Fore
: begin
2104 Make_Function_Call
(Loc
,
2105 Name
=> New_Reference_To
(RTE
(RE_Fore
), Loc
),
2107 Parameter_Associations
=> New_List
(
2108 Convert_To
(Universal_Real
,
2109 Make_Attribute_Reference
(Loc
,
2110 Prefix
=> New_Reference_To
(Ptyp
, Loc
),
2111 Attribute_Name
=> Name_First
)),
2113 Convert_To
(Universal_Real
,
2114 Make_Attribute_Reference
(Loc
,
2115 Prefix
=> New_Reference_To
(Ptyp
, Loc
),
2116 Attribute_Name
=> Name_Last
))))));
2118 Analyze_And_Resolve
(N
, Typ
);
2125 -- Transforms 'Fraction into a call to the floating-point attribute
2126 -- function Fraction in Fat_xxx (where xxx is the root type)
2128 when Attribute_Fraction
=>
2129 Expand_Fpt_Attribute_R
(N
);
2135 when Attribute_From_Any
=> From_Any
: declare
2136 P_Type
: constant Entity_Id
:= Etype
(Pref
);
2137 Decls
: constant List_Id
:= New_List
;
2140 Build_From_Any_Call
(P_Type
,
2141 Relocate_Node
(First
(Exprs
)),
2143 Insert_Actions
(N
, Decls
);
2144 Analyze_And_Resolve
(N
, P_Type
);
2151 -- For an exception returns a reference to the exception data:
2152 -- Exception_Id!(Prefix'Reference)
2154 -- For a task it returns a reference to the _task_id component of
2155 -- corresponding record:
2157 -- taskV!(Prefix)._Task_Id, converted to the type Task_Id defined
2159 -- in Ada.Task_Identification
2161 when Attribute_Identity
=> Identity
: declare
2162 Id_Kind
: Entity_Id
;
2165 if Ptyp
= Standard_Exception_Type
then
2166 Id_Kind
:= RTE
(RE_Exception_Id
);
2168 if Present
(Renamed_Object
(Entity
(Pref
))) then
2169 Set_Entity
(Pref
, Renamed_Object
(Entity
(Pref
)));
2173 Unchecked_Convert_To
(Id_Kind
, Make_Reference
(Loc
, Pref
)));
2175 Id_Kind
:= RTE
(RO_AT_Task_Id
);
2177 -- If the prefix is a task interface, the Task_Id is obtained
2178 -- dynamically through a dispatching call, as for other task
2179 -- attributes applied to interfaces.
2181 if Ada_Version
>= Ada_05
2182 and then Ekind
(Ptyp
) = E_Class_Wide_Type
2183 and then Is_Interface
(Ptyp
)
2184 and then Is_Task_Interface
(Ptyp
)
2187 Unchecked_Convert_To
(Id_Kind
,
2188 Make_Selected_Component
(Loc
,
2190 New_Copy_Tree
(Pref
),
2192 Make_Identifier
(Loc
, Name_uDisp_Get_Task_Id
))));
2196 Unchecked_Convert_To
(Id_Kind
, Concurrent_Ref
(Pref
)));
2200 Analyze_And_Resolve
(N
, Id_Kind
);
2207 -- Image attribute is handled in separate unit Exp_Imgv
2209 when Attribute_Image
=>
2210 Exp_Imgv
.Expand_Image_Attribute
(N
);
2216 -- X'Img is expanded to typ'Image (X), where typ is the type of X
2218 when Attribute_Img
=> Img
:
2221 Make_Attribute_Reference
(Loc
,
2222 Prefix
=> New_Reference_To
(Ptyp
, Loc
),
2223 Attribute_Name
=> Name_Image
,
2224 Expressions
=> New_List
(Relocate_Node
(Pref
))));
2226 Analyze_And_Resolve
(N
, Standard_String
);
2233 when Attribute_Input
=> Input
: declare
2234 P_Type
: constant Entity_Id
:= Entity
(Pref
);
2235 B_Type
: constant Entity_Id
:= Base_Type
(P_Type
);
2236 U_Type
: constant Entity_Id
:= Underlying_Type
(P_Type
);
2237 Strm
: constant Node_Id
:= First
(Exprs
);
2245 Cntrl
: Node_Id
:= Empty
;
2246 -- Value for controlling argument in call. Always Empty except in
2247 -- the dispatching (class-wide type) case, where it is a reference
2248 -- to the dummy object initialized to the right internal tag.
2250 procedure Freeze_Stream_Subprogram
(F
: Entity_Id
);
2251 -- The expansion of the attribute reference may generate a call to
2252 -- a user-defined stream subprogram that is frozen by the call. This
2253 -- can lead to access-before-elaboration problem if the reference
2254 -- appears in an object declaration and the subprogram body has not
2255 -- been seen. The freezing of the subprogram requires special code
2256 -- because it appears in an expanded context where expressions do
2257 -- not freeze their constituents.
2259 ------------------------------
2260 -- Freeze_Stream_Subprogram --
2261 ------------------------------
2263 procedure Freeze_Stream_Subprogram
(F
: Entity_Id
) is
2264 Decl
: constant Node_Id
:= Unit_Declaration_Node
(F
);
2268 -- If this is user-defined subprogram, the corresponding
2269 -- stream function appears as a renaming-as-body, and the
2270 -- user subprogram must be retrieved by tree traversal.
2273 and then Nkind
(Decl
) = N_Subprogram_Declaration
2274 and then Present
(Corresponding_Body
(Decl
))
2276 Bod
:= Corresponding_Body
(Decl
);
2278 if Nkind
(Unit_Declaration_Node
(Bod
)) =
2279 N_Subprogram_Renaming_Declaration
2281 Set_Is_Frozen
(Entity
(Name
(Unit_Declaration_Node
(Bod
))));
2284 end Freeze_Stream_Subprogram
;
2286 -- Start of processing for Input
2289 -- If no underlying type, we have an error that will be diagnosed
2290 -- elsewhere, so here we just completely ignore the expansion.
2296 -- If there is a TSS for Input, just call it
2298 Fname
:= Find_Stream_Subprogram
(P_Type
, TSS_Stream_Input
);
2300 if Present
(Fname
) then
2304 -- If there is a Stream_Convert pragma, use it, we rewrite
2306 -- sourcetyp'Input (stream)
2310 -- sourcetyp (streamread (strmtyp'Input (stream)));
2312 -- where streamread is the given Read function that converts an
2313 -- argument of type strmtyp to type sourcetyp or a type from which
2314 -- it is derived (extra conversion required for the derived case).
2316 Prag
:= Get_Stream_Convert_Pragma
(P_Type
);
2318 if Present
(Prag
) then
2319 Arg2
:= Next
(First
(Pragma_Argument_Associations
(Prag
)));
2320 Rfunc
:= Entity
(Expression
(Arg2
));
2324 Make_Function_Call
(Loc
,
2325 Name
=> New_Occurrence_Of
(Rfunc
, Loc
),
2326 Parameter_Associations
=> New_List
(
2327 Make_Attribute_Reference
(Loc
,
2330 (Etype
(First_Formal
(Rfunc
)), Loc
),
2331 Attribute_Name
=> Name_Input
,
2332 Expressions
=> Exprs
)))));
2334 Analyze_And_Resolve
(N
, B_Type
);
2339 elsif Is_Elementary_Type
(U_Type
) then
2341 -- A special case arises if we have a defined _Read routine,
2342 -- since in this case we are required to call this routine.
2344 if Present
(TSS
(Base_Type
(U_Type
), TSS_Stream_Read
)) then
2345 Build_Record_Or_Elementary_Input_Function
2346 (Loc
, U_Type
, Decl
, Fname
);
2347 Insert_Action
(N
, Decl
);
2349 -- For normal cases, we call the I_xxx routine directly
2352 Rewrite
(N
, Build_Elementary_Input_Call
(N
));
2353 Analyze_And_Resolve
(N
, P_Type
);
2359 elsif Is_Array_Type
(U_Type
) then
2360 Build_Array_Input_Function
(Loc
, U_Type
, Decl
, Fname
);
2361 Compile_Stream_Body_In_Scope
(N
, Decl
, U_Type
, Check
=> False);
2363 -- Dispatching case with class-wide type
2365 elsif Is_Class_Wide_Type
(P_Type
) then
2367 -- No need to do anything else compiling under restriction
2368 -- No_Dispatching_Calls. During the semantic analysis we
2369 -- already notified such violation.
2371 if Restriction_Active
(No_Dispatching_Calls
) then
2376 Rtyp
: constant Entity_Id
:= Root_Type
(P_Type
);
2381 -- Read the internal tag (RM 13.13.2(34)) and use it to
2382 -- initialize a dummy tag object:
2384 -- Dnn : Ada.Tags.Tag
2385 -- := Descendant_Tag (String'Input (Strm), P_Type);
2387 -- This dummy object is used only to provide a controlling
2388 -- argument for the eventual _Input call. Descendant_Tag is
2389 -- called rather than Internal_Tag to ensure that we have a
2390 -- tag for a type that is descended from the prefix type and
2391 -- declared at the same accessibility level (the exception
2392 -- Tag_Error will be raised otherwise). The level check is
2393 -- required for Ada 2005 because tagged types can be
2394 -- extended in nested scopes (AI-344).
2397 Make_Defining_Identifier
(Loc
,
2398 Chars
=> New_Internal_Name
('D'));
2401 Make_Object_Declaration
(Loc
,
2402 Defining_Identifier
=> Dnn
,
2403 Object_Definition
=>
2404 New_Occurrence_Of
(RTE
(RE_Tag
), Loc
),
2406 Make_Function_Call
(Loc
,
2408 New_Occurrence_Of
(RTE
(RE_Descendant_Tag
), Loc
),
2409 Parameter_Associations
=> New_List
(
2410 Make_Attribute_Reference
(Loc
,
2412 New_Occurrence_Of
(Standard_String
, Loc
),
2413 Attribute_Name
=> Name_Input
,
2414 Expressions
=> New_List
(
2416 (Duplicate_Subexpr
(Strm
)))),
2417 Make_Attribute_Reference
(Loc
,
2418 Prefix
=> New_Reference_To
(P_Type
, Loc
),
2419 Attribute_Name
=> Name_Tag
))));
2421 Insert_Action
(N
, Decl
);
2423 -- Now we need to get the entity for the call, and construct
2424 -- a function call node, where we preset a reference to Dnn
2425 -- as the controlling argument (doing an unchecked convert
2426 -- to the class-wide tagged type to make it look like a real
2429 Fname
:= Find_Prim_Op
(Rtyp
, TSS_Stream_Input
);
2430 Cntrl
:= Unchecked_Convert_To
(P_Type
,
2431 New_Occurrence_Of
(Dnn
, Loc
));
2432 Set_Etype
(Cntrl
, P_Type
);
2433 Set_Parent
(Cntrl
, N
);
2436 -- For tagged types, use the primitive Input function
2438 elsif Is_Tagged_Type
(U_Type
) then
2439 Fname
:= Find_Prim_Op
(U_Type
, TSS_Stream_Input
);
2441 -- All other record type cases, including protected records. The
2442 -- latter only arise for expander generated code for handling
2443 -- shared passive partition access.
2447 (Is_Record_Type
(U_Type
) or else Is_Protected_Type
(U_Type
));
2449 -- Ada 2005 (AI-216): Program_Error is raised executing default
2450 -- implementation of the Input attribute of an unchecked union
2451 -- type if the type lacks default discriminant values.
2453 if Is_Unchecked_Union
(Base_Type
(U_Type
))
2454 and then No
(Discriminant_Constraint
(U_Type
))
2457 Make_Raise_Program_Error
(Loc
,
2458 Reason
=> PE_Unchecked_Union_Restriction
));
2463 Build_Record_Or_Elementary_Input_Function
2464 (Loc
, Base_Type
(U_Type
), Decl
, Fname
);
2465 Insert_Action
(N
, Decl
);
2467 if Nkind
(Parent
(N
)) = N_Object_Declaration
2468 and then Is_Record_Type
(U_Type
)
2470 -- The stream function may contain calls to user-defined
2471 -- Read procedures for individual components.
2478 Comp
:= First_Component
(U_Type
);
2479 while Present
(Comp
) loop
2481 Find_Stream_Subprogram
2482 (Etype
(Comp
), TSS_Stream_Read
);
2484 if Present
(Func
) then
2485 Freeze_Stream_Subprogram
(Func
);
2488 Next_Component
(Comp
);
2495 -- If we fall through, Fname is the function to be called. The result
2496 -- is obtained by calling the appropriate function, then converting
2497 -- the result. The conversion does a subtype check.
2500 Make_Function_Call
(Loc
,
2501 Name
=> New_Occurrence_Of
(Fname
, Loc
),
2502 Parameter_Associations
=> New_List
(
2503 Relocate_Node
(Strm
)));
2505 Set_Controlling_Argument
(Call
, Cntrl
);
2506 Rewrite
(N
, Unchecked_Convert_To
(P_Type
, Call
));
2507 Analyze_And_Resolve
(N
, P_Type
);
2509 if Nkind
(Parent
(N
)) = N_Object_Declaration
then
2510 Freeze_Stream_Subprogram
(Fname
);
2520 -- inttype'Fixed_Value (fixed-value)
2524 -- inttype(integer-value))
2526 -- we do all the required analysis of the conversion here, because we do
2527 -- not want this to go through the fixed-point conversion circuits. Note
2528 -- that the back end always treats fixed-point as equivalent to the
2529 -- corresponding integer type anyway.
2531 when Attribute_Integer_Value
=> Integer_Value
:
2534 Make_Type_Conversion
(Loc
,
2535 Subtype_Mark
=> New_Occurrence_Of
(Entity
(Pref
), Loc
),
2536 Expression
=> Relocate_Node
(First
(Exprs
))));
2537 Set_Etype
(N
, Entity
(Pref
));
2540 -- Note: it might appear that a properly analyzed unchecked conversion
2541 -- would be just fine here, but that's not the case, since the full
2542 -- range checks performed by the following call are critical!
2544 Apply_Type_Conversion_Checks
(N
);
2551 when Attribute_Invalid_Value
=>
2552 Rewrite
(N
, Get_Simple_Init_Val
(Ptyp
, N
));
2558 when Attribute_Last
=>
2560 -- If the prefix type is a constrained packed array type which
2561 -- already has a Packed_Array_Type representation defined, then
2562 -- replace this attribute with a direct reference to 'Last of the
2563 -- appropriate index subtype (since otherwise the back end will try
2564 -- to give us the value of 'Last for this implementation type).
2566 if Is_Constrained_Packed_Array
(Ptyp
) then
2568 Make_Attribute_Reference
(Loc
,
2569 Attribute_Name
=> Name_Last
,
2570 Prefix
=> New_Reference_To
(Get_Index_Subtype
(N
), Loc
)));
2571 Analyze_And_Resolve
(N
, Typ
);
2573 elsif Is_Access_Type
(Ptyp
) then
2574 Apply_Access_Check
(N
);
2581 -- We compute this if a component clause was present, otherwise we leave
2582 -- the computation up to the back end, since we don't know what layout
2585 when Attribute_Last_Bit
=> Last_Bit
: declare
2586 CE
: constant Entity_Id
:= Entity
(Selector_Name
(Pref
));
2589 if Known_Static_Component_Bit_Offset
(CE
)
2590 and then Known_Static_Esize
(CE
)
2593 Make_Integer_Literal
(Loc
,
2594 Intval
=> (Component_Bit_Offset
(CE
) mod System_Storage_Unit
)
2597 Analyze_And_Resolve
(N
, Typ
);
2600 Apply_Universal_Integer_Attribute_Checks
(N
);
2608 -- Transforms 'Leading_Part into a call to the floating-point attribute
2609 -- function Leading_Part in Fat_xxx (where xxx is the root type)
2611 -- Note: strictly, we should generate special case code to deal with
2612 -- absurdly large positive arguments (greater than Integer'Last), which
2613 -- result in returning the first argument unchanged, but it hardly seems
2614 -- worth the effort. We raise constraint error for absurdly negative
2615 -- arguments which is fine.
2617 when Attribute_Leading_Part
=>
2618 Expand_Fpt_Attribute_RI
(N
);
2624 when Attribute_Length
=> declare
2629 -- Processing for packed array types
2631 if Is_Array_Type
(Ptyp
) and then Is_Packed
(Ptyp
) then
2632 Ityp
:= Get_Index_Subtype
(N
);
2634 -- If the index type, Ityp, is an enumeration type with holes,
2635 -- then we calculate X'Length explicitly using
2638 -- (0, Ityp'Pos (X'Last (N)) -
2639 -- Ityp'Pos (X'First (N)) + 1);
2641 -- Since the bounds in the template are the representation values
2642 -- and the back end would get the wrong value.
2644 if Is_Enumeration_Type
(Ityp
)
2645 and then Present
(Enum_Pos_To_Rep
(Base_Type
(Ityp
)))
2650 Xnum
:= Expr_Value
(First
(Expressions
(N
)));
2654 Make_Attribute_Reference
(Loc
,
2655 Prefix
=> New_Occurrence_Of
(Typ
, Loc
),
2656 Attribute_Name
=> Name_Max
,
2657 Expressions
=> New_List
2658 (Make_Integer_Literal
(Loc
, 0),
2662 Make_Op_Subtract
(Loc
,
2664 Make_Attribute_Reference
(Loc
,
2665 Prefix
=> New_Occurrence_Of
(Ityp
, Loc
),
2666 Attribute_Name
=> Name_Pos
,
2668 Expressions
=> New_List
(
2669 Make_Attribute_Reference
(Loc
,
2670 Prefix
=> Duplicate_Subexpr
(Pref
),
2671 Attribute_Name
=> Name_Last
,
2672 Expressions
=> New_List
(
2673 Make_Integer_Literal
(Loc
, Xnum
))))),
2676 Make_Attribute_Reference
(Loc
,
2677 Prefix
=> New_Occurrence_Of
(Ityp
, Loc
),
2678 Attribute_Name
=> Name_Pos
,
2680 Expressions
=> New_List
(
2681 Make_Attribute_Reference
(Loc
,
2683 Duplicate_Subexpr_No_Checks
(Pref
),
2684 Attribute_Name
=> Name_First
,
2685 Expressions
=> New_List
(
2686 Make_Integer_Literal
(Loc
, Xnum
)))))),
2688 Right_Opnd
=> Make_Integer_Literal
(Loc
, 1)))));
2690 Analyze_And_Resolve
(N
, Typ
, Suppress
=> All_Checks
);
2693 -- If the prefix type is a constrained packed array type which
2694 -- already has a Packed_Array_Type representation defined, then
2695 -- replace this attribute with a direct reference to 'Range_Length
2696 -- of the appropriate index subtype (since otherwise the back end
2697 -- will try to give us the value of 'Length for this
2698 -- implementation type).
2700 elsif Is_Constrained
(Ptyp
) then
2702 Make_Attribute_Reference
(Loc
,
2703 Attribute_Name
=> Name_Range_Length
,
2704 Prefix
=> New_Reference_To
(Ityp
, Loc
)));
2705 Analyze_And_Resolve
(N
, Typ
);
2710 elsif Is_Access_Type
(Ptyp
) then
2711 Apply_Access_Check
(N
);
2713 -- If the designated type is a packed array type, then we convert
2714 -- the reference to:
2717 -- xtyp'Pos (Pref'Last (Expr)) -
2718 -- xtyp'Pos (Pref'First (Expr)));
2720 -- This is a bit complex, but it is the easiest thing to do that
2721 -- works in all cases including enum types with holes xtyp here
2722 -- is the appropriate index type.
2725 Dtyp
: constant Entity_Id
:= Designated_Type
(Ptyp
);
2729 if Is_Array_Type
(Dtyp
) and then Is_Packed
(Dtyp
) then
2730 Xtyp
:= Get_Index_Subtype
(N
);
2733 Make_Attribute_Reference
(Loc
,
2734 Prefix
=> New_Occurrence_Of
(Typ
, Loc
),
2735 Attribute_Name
=> Name_Max
,
2736 Expressions
=> New_List
(
2737 Make_Integer_Literal
(Loc
, 0),
2740 Make_Integer_Literal
(Loc
, 1),
2741 Make_Op_Subtract
(Loc
,
2743 Make_Attribute_Reference
(Loc
,
2744 Prefix
=> New_Occurrence_Of
(Xtyp
, Loc
),
2745 Attribute_Name
=> Name_Pos
,
2746 Expressions
=> New_List
(
2747 Make_Attribute_Reference
(Loc
,
2748 Prefix
=> Duplicate_Subexpr
(Pref
),
2749 Attribute_Name
=> Name_Last
,
2751 New_Copy_List
(Exprs
)))),
2754 Make_Attribute_Reference
(Loc
,
2755 Prefix
=> New_Occurrence_Of
(Xtyp
, Loc
),
2756 Attribute_Name
=> Name_Pos
,
2757 Expressions
=> New_List
(
2758 Make_Attribute_Reference
(Loc
,
2760 Duplicate_Subexpr_No_Checks
(Pref
),
2761 Attribute_Name
=> Name_First
,
2763 New_Copy_List
(Exprs
)))))))));
2765 Analyze_And_Resolve
(N
, Typ
);
2769 -- Otherwise leave it to the back end
2772 Apply_Universal_Integer_Attribute_Checks
(N
);
2780 -- Transforms 'Machine into a call to the floating-point attribute
2781 -- function Machine in Fat_xxx (where xxx is the root type)
2783 when Attribute_Machine
=>
2784 Expand_Fpt_Attribute_R
(N
);
2786 ----------------------
2787 -- Machine_Rounding --
2788 ----------------------
2790 -- Transforms 'Machine_Rounding into a call to the floating-point
2791 -- attribute function Machine_Rounding in Fat_xxx (where xxx is the root
2792 -- type). Expansion is avoided for cases the back end can handle
2795 when Attribute_Machine_Rounding
=>
2796 if not Is_Inline_Floating_Point_Attribute
(N
) then
2797 Expand_Fpt_Attribute_R
(N
);
2804 -- Machine_Size is equivalent to Object_Size, so transform it into
2805 -- Object_Size and that way the back end never sees Machine_Size.
2807 when Attribute_Machine_Size
=>
2809 Make_Attribute_Reference
(Loc
,
2810 Prefix
=> Prefix
(N
),
2811 Attribute_Name
=> Name_Object_Size
));
2813 Analyze_And_Resolve
(N
, Typ
);
2819 -- The only case that can get this far is the dynamic case of the old
2820 -- Ada 83 Mantissa attribute for the fixed-point case. For this case,
2827 -- ityp (System.Mantissa.Mantissa_Value
2828 -- (Integer'Integer_Value (typ'First),
2829 -- Integer'Integer_Value (typ'Last)));
2831 when Attribute_Mantissa
=> Mantissa
: begin
2834 Make_Function_Call
(Loc
,
2835 Name
=> New_Occurrence_Of
(RTE
(RE_Mantissa_Value
), Loc
),
2837 Parameter_Associations
=> New_List
(
2839 Make_Attribute_Reference
(Loc
,
2840 Prefix
=> New_Occurrence_Of
(Standard_Integer
, Loc
),
2841 Attribute_Name
=> Name_Integer_Value
,
2842 Expressions
=> New_List
(
2844 Make_Attribute_Reference
(Loc
,
2845 Prefix
=> New_Occurrence_Of
(Ptyp
, Loc
),
2846 Attribute_Name
=> Name_First
))),
2848 Make_Attribute_Reference
(Loc
,
2849 Prefix
=> New_Occurrence_Of
(Standard_Integer
, Loc
),
2850 Attribute_Name
=> Name_Integer_Value
,
2851 Expressions
=> New_List
(
2853 Make_Attribute_Reference
(Loc
,
2854 Prefix
=> New_Occurrence_Of
(Ptyp
, Loc
),
2855 Attribute_Name
=> Name_Last
)))))));
2857 Analyze_And_Resolve
(N
, Typ
);
2860 --------------------
2861 -- Mechanism_Code --
2862 --------------------
2864 when Attribute_Mechanism_Code
=>
2866 -- We must replace the prefix in the renamed case
2868 if Is_Entity_Name
(Pref
)
2869 and then Present
(Alias
(Entity
(Pref
)))
2871 Set_Renamed_Subprogram
(Pref
, Alias
(Entity
(Pref
)));
2878 when Attribute_Mod
=> Mod_Case
: declare
2879 Arg
: constant Node_Id
:= Relocate_Node
(First
(Exprs
));
2880 Hi
: constant Node_Id
:= Type_High_Bound
(Etype
(Arg
));
2881 Modv
: constant Uint
:= Modulus
(Btyp
);
2885 -- This is not so simple. The issue is what type to use for the
2886 -- computation of the modular value.
2888 -- The easy case is when the modulus value is within the bounds
2889 -- of the signed integer type of the argument. In this case we can
2890 -- just do the computation in that signed integer type, and then
2891 -- do an ordinary conversion to the target type.
2893 if Modv
<= Expr_Value
(Hi
) then
2898 Right_Opnd
=> Make_Integer_Literal
(Loc
, Modv
))));
2900 -- Here we know that the modulus is larger than type'Last of the
2901 -- integer type. There are two cases to consider:
2903 -- a) The integer value is non-negative. In this case, it is
2904 -- returned as the result (since it is less than the modulus).
2906 -- b) The integer value is negative. In this case, we know that the
2907 -- result is modulus + value, where the value might be as small as
2908 -- -modulus. The trouble is what type do we use to do the subtract.
2909 -- No type will do, since modulus can be as big as 2**64, and no
2910 -- integer type accommodates this value. Let's do bit of algebra
2913 -- = modulus - (-value)
2914 -- = (modulus - 1) - (-value - 1)
2916 -- Now modulus - 1 is certainly in range of the modular type.
2917 -- -value is in the range 1 .. modulus, so -value -1 is in the
2918 -- range 0 .. modulus-1 which is in range of the modular type.
2919 -- Furthermore, (-value - 1) can be expressed as -(value + 1)
2920 -- which we can compute using the integer base type.
2922 -- Once this is done we analyze the conditional expression without
2923 -- range checks, because we know everything is in range, and we
2924 -- want to prevent spurious warnings on either branch.
2928 Make_Conditional_Expression
(Loc
,
2929 Expressions
=> New_List
(
2931 Left_Opnd
=> Duplicate_Subexpr
(Arg
),
2932 Right_Opnd
=> Make_Integer_Literal
(Loc
, 0)),
2935 Duplicate_Subexpr_No_Checks
(Arg
)),
2937 Make_Op_Subtract
(Loc
,
2939 Make_Integer_Literal
(Loc
,
2940 Intval
=> Modv
- 1),
2946 Left_Opnd
=> Duplicate_Subexpr_No_Checks
(Arg
),
2948 Make_Integer_Literal
(Loc
,
2949 Intval
=> 1))))))));
2953 Analyze_And_Resolve
(N
, Btyp
, Suppress
=> All_Checks
);
2960 -- Transforms 'Model into a call to the floating-point attribute
2961 -- function Model in Fat_xxx (where xxx is the root type)
2963 when Attribute_Model
=>
2964 Expand_Fpt_Attribute_R
(N
);
2970 -- The processing for Object_Size shares the processing for Size
2976 when Attribute_Old
=> Old
: declare
2977 Tnn
: constant Entity_Id
:=
2978 Make_Defining_Identifier
(Loc
,
2979 Chars
=> New_Internal_Name
('T'));
2984 -- Find the nearest subprogram body, ignoring _Preconditions
2988 Subp
:= Parent
(Subp
);
2989 exit when Nkind
(Subp
) = N_Subprogram_Body
2990 and then Chars
(Defining_Entity
(Subp
)) /= Name_uPostconditions
;
2993 -- Insert the assignment at the start of the declarations
2996 Make_Object_Declaration
(Loc
,
2997 Defining_Identifier
=> Tnn
,
2998 Constant_Present
=> True,
2999 Object_Definition
=> New_Occurrence_Of
(Etype
(N
), Loc
),
3000 Expression
=> Pref
);
3002 if Is_Empty_List
(Declarations
(Subp
)) then
3003 Set_Declarations
(Subp
, New_List
(Asn_Stm
));
3006 Insert_Action
(First
(Declarations
(Subp
)), Asn_Stm
);
3009 Rewrite
(N
, New_Occurrence_Of
(Tnn
, Loc
));
3016 when Attribute_Output
=> Output
: declare
3017 P_Type
: constant Entity_Id
:= Entity
(Pref
);
3018 U_Type
: constant Entity_Id
:= Underlying_Type
(P_Type
);
3026 -- If no underlying type, we have an error that will be diagnosed
3027 -- elsewhere, so here we just completely ignore the expansion.
3033 -- If TSS for Output is present, just call it
3035 Pname
:= Find_Stream_Subprogram
(P_Type
, TSS_Stream_Output
);
3037 if Present
(Pname
) then
3041 -- If there is a Stream_Convert pragma, use it, we rewrite
3043 -- sourcetyp'Output (stream, Item)
3047 -- strmtyp'Output (Stream, strmwrite (acttyp (Item)));
3049 -- where strmwrite is the given Write function that converts an
3050 -- argument of type sourcetyp or a type acctyp, from which it is
3051 -- derived to type strmtyp. The conversion to acttyp is required
3052 -- for the derived case.
3054 Prag
:= Get_Stream_Convert_Pragma
(P_Type
);
3056 if Present
(Prag
) then
3058 Next
(Next
(First
(Pragma_Argument_Associations
(Prag
))));
3059 Wfunc
:= Entity
(Expression
(Arg3
));
3062 Make_Attribute_Reference
(Loc
,
3063 Prefix
=> New_Occurrence_Of
(Etype
(Wfunc
), Loc
),
3064 Attribute_Name
=> Name_Output
,
3065 Expressions
=> New_List
(
3066 Relocate_Node
(First
(Exprs
)),
3067 Make_Function_Call
(Loc
,
3068 Name
=> New_Occurrence_Of
(Wfunc
, Loc
),
3069 Parameter_Associations
=> New_List
(
3070 OK_Convert_To
(Etype
(First_Formal
(Wfunc
)),
3071 Relocate_Node
(Next
(First
(Exprs
)))))))));
3076 -- For elementary types, we call the W_xxx routine directly.
3077 -- Note that the effect of Write and Output is identical for
3078 -- the case of an elementary type, since there are no
3079 -- discriminants or bounds.
3081 elsif Is_Elementary_Type
(U_Type
) then
3083 -- A special case arises if we have a defined _Write routine,
3084 -- since in this case we are required to call this routine.
3086 if Present
(TSS
(Base_Type
(U_Type
), TSS_Stream_Write
)) then
3087 Build_Record_Or_Elementary_Output_Procedure
3088 (Loc
, U_Type
, Decl
, Pname
);
3089 Insert_Action
(N
, Decl
);
3091 -- For normal cases, we call the W_xxx routine directly
3094 Rewrite
(N
, Build_Elementary_Write_Call
(N
));
3101 elsif Is_Array_Type
(U_Type
) then
3102 Build_Array_Output_Procedure
(Loc
, U_Type
, Decl
, Pname
);
3103 Compile_Stream_Body_In_Scope
(N
, Decl
, U_Type
, Check
=> False);
3105 -- Class-wide case, first output external tag, then dispatch
3106 -- to the appropriate primitive Output function (RM 13.13.2(31)).
3108 elsif Is_Class_Wide_Type
(P_Type
) then
3110 -- No need to do anything else compiling under restriction
3111 -- No_Dispatching_Calls. During the semantic analysis we
3112 -- already notified such violation.
3114 if Restriction_Active
(No_Dispatching_Calls
) then
3119 Strm
: constant Node_Id
:= First
(Exprs
);
3120 Item
: constant Node_Id
:= Next
(Strm
);
3123 -- Ada 2005 (AI-344): Check that the accessibility level
3124 -- of the type of the output object is not deeper than
3125 -- that of the attribute's prefix type.
3127 -- if Get_Access_Level (Item'Tag)
3128 -- /= Get_Access_Level (P_Type'Tag)
3133 -- String'Output (Strm, External_Tag (Item'Tag));
3135 -- We cannot figure out a practical way to implement this
3136 -- accessibility check on virtual machines, so we omit it.
3138 if Ada_Version
>= Ada_05
3139 and then Tagged_Type_Expansion
3142 Make_Implicit_If_Statement
(N
,
3146 Build_Get_Access_Level
(Loc
,
3147 Make_Attribute_Reference
(Loc
,
3150 Duplicate_Subexpr
(Item
,
3152 Attribute_Name
=> Name_Tag
)),
3155 Make_Integer_Literal
(Loc
,
3156 Type_Access_Level
(P_Type
))),
3159 New_List
(Make_Raise_Statement
(Loc
,
3161 RTE
(RE_Tag_Error
), Loc
)))));
3165 Make_Attribute_Reference
(Loc
,
3166 Prefix
=> New_Occurrence_Of
(Standard_String
, Loc
),
3167 Attribute_Name
=> Name_Output
,
3168 Expressions
=> New_List
(
3169 Relocate_Node
(Duplicate_Subexpr
(Strm
)),
3170 Make_Function_Call
(Loc
,
3172 New_Occurrence_Of
(RTE
(RE_External_Tag
), Loc
),
3173 Parameter_Associations
=> New_List
(
3174 Make_Attribute_Reference
(Loc
,
3177 (Duplicate_Subexpr
(Item
, Name_Req
=> True)),
3178 Attribute_Name
=> Name_Tag
))))));
3181 Pname
:= Find_Prim_Op
(U_Type
, TSS_Stream_Output
);
3183 -- Tagged type case, use the primitive Output function
3185 elsif Is_Tagged_Type
(U_Type
) then
3186 Pname
:= Find_Prim_Op
(U_Type
, TSS_Stream_Output
);
3188 -- All other record type cases, including protected records.
3189 -- The latter only arise for expander generated code for
3190 -- handling shared passive partition access.
3194 (Is_Record_Type
(U_Type
) or else Is_Protected_Type
(U_Type
));
3196 -- Ada 2005 (AI-216): Program_Error is raised when executing
3197 -- the default implementation of the Output attribute of an
3198 -- unchecked union type if the type lacks default discriminant
3201 if Is_Unchecked_Union
(Base_Type
(U_Type
))
3202 and then No
(Discriminant_Constraint
(U_Type
))
3205 Make_Raise_Program_Error
(Loc
,
3206 Reason
=> PE_Unchecked_Union_Restriction
));
3211 Build_Record_Or_Elementary_Output_Procedure
3212 (Loc
, Base_Type
(U_Type
), Decl
, Pname
);
3213 Insert_Action
(N
, Decl
);
3217 -- If we fall through, Pname is the name of the procedure to call
3219 Rewrite_Stream_Proc_Call
(Pname
);
3226 -- For enumeration types with a standard representation, Pos is
3227 -- handled by the back end.
3229 -- For enumeration types, with a non-standard representation we
3230 -- generate a call to the _Rep_To_Pos function created when the
3231 -- type was frozen. The call has the form
3233 -- _rep_to_pos (expr, flag)
3235 -- The parameter flag is True if range checks are enabled, causing
3236 -- Program_Error to be raised if the expression has an invalid
3237 -- representation, and False if range checks are suppressed.
3239 -- For integer types, Pos is equivalent to a simple integer
3240 -- conversion and we rewrite it as such
3242 when Attribute_Pos
=> Pos
:
3244 Etyp
: Entity_Id
:= Base_Type
(Entity
(Pref
));
3247 -- Deal with zero/non-zero boolean values
3249 if Is_Boolean_Type
(Etyp
) then
3250 Adjust_Condition
(First
(Exprs
));
3251 Etyp
:= Standard_Boolean
;
3252 Set_Prefix
(N
, New_Occurrence_Of
(Standard_Boolean
, Loc
));
3255 -- Case of enumeration type
3257 if Is_Enumeration_Type
(Etyp
) then
3259 -- Non-standard enumeration type (generate call)
3261 if Present
(Enum_Pos_To_Rep
(Etyp
)) then
3262 Append_To
(Exprs
, Rep_To_Pos_Flag
(Etyp
, Loc
));
3265 Make_Function_Call
(Loc
,
3267 New_Reference_To
(TSS
(Etyp
, TSS_Rep_To_Pos
), Loc
),
3268 Parameter_Associations
=> Exprs
)));
3270 Analyze_And_Resolve
(N
, Typ
);
3272 -- Standard enumeration type (do universal integer check)
3275 Apply_Universal_Integer_Attribute_Checks
(N
);
3278 -- Deal with integer types (replace by conversion)
3280 elsif Is_Integer_Type
(Etyp
) then
3281 Rewrite
(N
, Convert_To
(Typ
, First
(Exprs
)));
3282 Analyze_And_Resolve
(N
, Typ
);
3291 -- We compute this if a component clause was present, otherwise we leave
3292 -- the computation up to the back end, since we don't know what layout
3295 when Attribute_Position
=> Position
:
3297 CE
: constant Entity_Id
:= Entity
(Selector_Name
(Pref
));
3300 if Present
(Component_Clause
(CE
)) then
3302 Make_Integer_Literal
(Loc
,
3303 Intval
=> Component_Bit_Offset
(CE
) / System_Storage_Unit
));
3304 Analyze_And_Resolve
(N
, Typ
);
3307 Apply_Universal_Integer_Attribute_Checks
(N
);
3315 -- 1. Deal with enumeration types with holes
3316 -- 2. For floating-point, generate call to attribute function
3317 -- 3. For other cases, deal with constraint checking
3319 when Attribute_Pred
=> Pred
:
3321 Etyp
: constant Entity_Id
:= Base_Type
(Ptyp
);
3325 -- For enumeration types with non-standard representations, we
3326 -- expand typ'Pred (x) into
3328 -- Pos_To_Rep (Rep_To_Pos (x) - 1)
3330 -- If the representation is contiguous, we compute instead
3331 -- Lit1 + Rep_to_Pos (x -1), to catch invalid representations.
3332 -- The conversion function Enum_Pos_To_Rep is defined on the
3333 -- base type, not the subtype, so we have to use the base type
3334 -- explicitly for this and other enumeration attributes.
3336 if Is_Enumeration_Type
(Ptyp
)
3337 and then Present
(Enum_Pos_To_Rep
(Etyp
))
3339 if Has_Contiguous_Rep
(Etyp
) then
3341 Unchecked_Convert_To
(Ptyp
,
3344 Make_Integer_Literal
(Loc
,
3345 Enumeration_Rep
(First_Literal
(Ptyp
))),
3347 Make_Function_Call
(Loc
,
3350 (TSS
(Etyp
, TSS_Rep_To_Pos
), Loc
),
3352 Parameter_Associations
=>
3354 Unchecked_Convert_To
(Ptyp
,
3355 Make_Op_Subtract
(Loc
,
3357 Unchecked_Convert_To
(Standard_Integer
,
3358 Relocate_Node
(First
(Exprs
))),
3360 Make_Integer_Literal
(Loc
, 1))),
3361 Rep_To_Pos_Flag
(Ptyp
, Loc
))))));
3364 -- Add Boolean parameter True, to request program errror if
3365 -- we have a bad representation on our hands. If checks are
3366 -- suppressed, then add False instead
3368 Append_To
(Exprs
, Rep_To_Pos_Flag
(Ptyp
, Loc
));
3370 Make_Indexed_Component
(Loc
,
3373 (Enum_Pos_To_Rep
(Etyp
), Loc
),
3374 Expressions
=> New_List
(
3375 Make_Op_Subtract
(Loc
,
3377 Make_Function_Call
(Loc
,
3380 (TSS
(Etyp
, TSS_Rep_To_Pos
), Loc
),
3381 Parameter_Associations
=> Exprs
),
3382 Right_Opnd
=> Make_Integer_Literal
(Loc
, 1)))));
3385 Analyze_And_Resolve
(N
, Typ
);
3387 -- For floating-point, we transform 'Pred into a call to the Pred
3388 -- floating-point attribute function in Fat_xxx (xxx is root type)
3390 elsif Is_Floating_Point_Type
(Ptyp
) then
3391 Expand_Fpt_Attribute_R
(N
);
3392 Analyze_And_Resolve
(N
, Typ
);
3394 -- For modular types, nothing to do (no overflow, since wraps)
3396 elsif Is_Modular_Integer_Type
(Ptyp
) then
3399 -- For other types, if argument is marked as needing a range check or
3400 -- overflow checking is enabled, we must generate a check.
3402 elsif not Overflow_Checks_Suppressed
(Ptyp
)
3403 or else Do_Range_Check
(First
(Exprs
))
3405 Set_Do_Range_Check
(First
(Exprs
), False);
3406 Expand_Pred_Succ
(N
);
3414 -- Ada 2005 (AI-327): Dynamic ceiling priorities
3416 -- We rewrite X'Priority as the following run-time call:
3418 -- Get_Ceiling (X._Object)
3420 -- Note that although X'Priority is notionally an object, it is quite
3421 -- deliberately not defined as an aliased object in the RM. This means
3422 -- that it works fine to rewrite it as a call, without having to worry
3423 -- about complications that would other arise from X'Priority'Access,
3424 -- which is illegal, because of the lack of aliasing.
3426 when Attribute_Priority
=>
3429 Conctyp
: Entity_Id
;
3430 Object_Parm
: Node_Id
;
3432 RT_Subprg_Name
: Node_Id
;
3435 -- Look for the enclosing concurrent type
3437 Conctyp
:= Current_Scope
;
3438 while not Is_Concurrent_Type
(Conctyp
) loop
3439 Conctyp
:= Scope
(Conctyp
);
3442 pragma Assert
(Is_Protected_Type
(Conctyp
));
3444 -- Generate the actual of the call
3446 Subprg
:= Current_Scope
;
3447 while not Present
(Protected_Body_Subprogram
(Subprg
)) loop
3448 Subprg
:= Scope
(Subprg
);
3451 -- Use of 'Priority inside protected entries and barriers (in
3452 -- both cases the type of the first formal of their expanded
3453 -- subprogram is Address)
3455 if Etype
(First_Entity
(Protected_Body_Subprogram
(Subprg
)))
3459 New_Itype
: Entity_Id
;
3462 -- In the expansion of protected entries the type of the
3463 -- first formal of the Protected_Body_Subprogram is an
3464 -- Address. In order to reference the _object component
3467 -- type T is access p__ptTV;
3470 New_Itype
:= Create_Itype
(E_Access_Type
, N
);
3471 Set_Etype
(New_Itype
, New_Itype
);
3472 Set_Directly_Designated_Type
(New_Itype
,
3473 Corresponding_Record_Type
(Conctyp
));
3474 Freeze_Itype
(New_Itype
, N
);
3477 -- T!(O)._object'unchecked_access
3480 Make_Attribute_Reference
(Loc
,
3482 Make_Selected_Component
(Loc
,
3484 Unchecked_Convert_To
(New_Itype
,
3487 (Protected_Body_Subprogram
(Subprg
)),
3490 Make_Identifier
(Loc
, Name_uObject
)),
3491 Attribute_Name
=> Name_Unchecked_Access
);
3494 -- Use of 'Priority inside a protected subprogram
3498 Make_Attribute_Reference
(Loc
,
3500 Make_Selected_Component
(Loc
,
3501 Prefix
=> New_Reference_To
3503 (Protected_Body_Subprogram
(Subprg
)),
3506 Make_Identifier
(Loc
, Name_uObject
)),
3507 Attribute_Name
=> Name_Unchecked_Access
);
3510 -- Select the appropriate run-time subprogram
3512 if Number_Entries
(Conctyp
) = 0 then
3514 New_Reference_To
(RTE
(RE_Get_Ceiling
), Loc
);
3517 New_Reference_To
(RTE
(RO_PE_Get_Ceiling
), Loc
);
3521 Make_Function_Call
(Loc
,
3522 Name
=> RT_Subprg_Name
,
3523 Parameter_Associations
=> New_List
(Object_Parm
));
3527 -- Avoid the generation of extra checks on the pointer to the
3528 -- protected object.
3530 Analyze_And_Resolve
(N
, Typ
, Suppress
=> Access_Check
);
3537 when Attribute_Range_Length
=> Range_Length
: begin
3538 -- The only special processing required is for the case where
3539 -- Range_Length is applied to an enumeration type with holes.
3540 -- In this case we transform
3546 -- X'Pos (X'Last) - X'Pos (X'First) + 1
3548 -- So that the result reflects the proper Pos values instead
3549 -- of the underlying representations.
3551 if Is_Enumeration_Type
(Ptyp
)
3552 and then Has_Non_Standard_Rep
(Ptyp
)
3557 Make_Op_Subtract
(Loc
,
3559 Make_Attribute_Reference
(Loc
,
3560 Attribute_Name
=> Name_Pos
,
3561 Prefix
=> New_Occurrence_Of
(Ptyp
, Loc
),
3562 Expressions
=> New_List
(
3563 Make_Attribute_Reference
(Loc
,
3564 Attribute_Name
=> Name_Last
,
3565 Prefix
=> New_Occurrence_Of
(Ptyp
, Loc
)))),
3568 Make_Attribute_Reference
(Loc
,
3569 Attribute_Name
=> Name_Pos
,
3570 Prefix
=> New_Occurrence_Of
(Ptyp
, Loc
),
3571 Expressions
=> New_List
(
3572 Make_Attribute_Reference
(Loc
,
3573 Attribute_Name
=> Name_First
,
3574 Prefix
=> New_Occurrence_Of
(Ptyp
, Loc
))))),
3577 Make_Integer_Literal
(Loc
, 1)));
3579 Analyze_And_Resolve
(N
, Typ
);
3581 -- For all other cases, the attribute is handled by the back end, but
3582 -- we need to deal with the case of the range check on a universal
3586 Apply_Universal_Integer_Attribute_Checks
(N
);
3594 when Attribute_Read
=> Read
: declare
3595 P_Type
: constant Entity_Id
:= Entity
(Pref
);
3596 B_Type
: constant Entity_Id
:= Base_Type
(P_Type
);
3597 U_Type
: constant Entity_Id
:= Underlying_Type
(P_Type
);
3607 -- If no underlying type, we have an error that will be diagnosed
3608 -- elsewhere, so here we just completely ignore the expansion.
3614 -- The simple case, if there is a TSS for Read, just call it
3616 Pname
:= Find_Stream_Subprogram
(P_Type
, TSS_Stream_Read
);
3618 if Present
(Pname
) then
3622 -- If there is a Stream_Convert pragma, use it, we rewrite
3624 -- sourcetyp'Read (stream, Item)
3628 -- Item := sourcetyp (strmread (strmtyp'Input (Stream)));
3630 -- where strmread is the given Read function that converts an
3631 -- argument of type strmtyp to type sourcetyp or a type from which
3632 -- it is derived. The conversion to sourcetyp is required in the
3635 -- A special case arises if Item is a type conversion in which
3636 -- case, we have to expand to:
3638 -- Itemx := typex (strmread (strmtyp'Input (Stream)));
3640 -- where Itemx is the expression of the type conversion (i.e.
3641 -- the actual object), and typex is the type of Itemx.
3643 Prag
:= Get_Stream_Convert_Pragma
(P_Type
);
3645 if Present
(Prag
) then
3646 Arg2
:= Next
(First
(Pragma_Argument_Associations
(Prag
)));
3647 Rfunc
:= Entity
(Expression
(Arg2
));
3648 Lhs
:= Relocate_Node
(Next
(First
(Exprs
)));
3650 OK_Convert_To
(B_Type
,
3651 Make_Function_Call
(Loc
,
3652 Name
=> New_Occurrence_Of
(Rfunc
, Loc
),
3653 Parameter_Associations
=> New_List
(
3654 Make_Attribute_Reference
(Loc
,
3657 (Etype
(First_Formal
(Rfunc
)), Loc
),
3658 Attribute_Name
=> Name_Input
,
3659 Expressions
=> New_List
(
3660 Relocate_Node
(First
(Exprs
)))))));
3662 if Nkind
(Lhs
) = N_Type_Conversion
then
3663 Lhs
:= Expression
(Lhs
);
3664 Rhs
:= Convert_To
(Etype
(Lhs
), Rhs
);
3668 Make_Assignment_Statement
(Loc
,
3670 Expression
=> Rhs
));
3671 Set_Assignment_OK
(Lhs
);
3675 -- For elementary types, we call the I_xxx routine using the first
3676 -- parameter and then assign the result into the second parameter.
3677 -- We set Assignment_OK to deal with the conversion case.
3679 elsif Is_Elementary_Type
(U_Type
) then
3685 Lhs
:= Relocate_Node
(Next
(First
(Exprs
)));
3686 Rhs
:= Build_Elementary_Input_Call
(N
);
3688 if Nkind
(Lhs
) = N_Type_Conversion
then
3689 Lhs
:= Expression
(Lhs
);
3690 Rhs
:= Convert_To
(Etype
(Lhs
), Rhs
);
3693 Set_Assignment_OK
(Lhs
);
3696 Make_Assignment_Statement
(Loc
,
3698 Expression
=> Rhs
));
3706 elsif Is_Array_Type
(U_Type
) then
3707 Build_Array_Read_Procedure
(N
, U_Type
, Decl
, Pname
);
3708 Compile_Stream_Body_In_Scope
(N
, Decl
, U_Type
, Check
=> False);
3710 -- Tagged type case, use the primitive Read function. Note that
3711 -- this will dispatch in the class-wide case which is what we want
3713 elsif Is_Tagged_Type
(U_Type
) then
3714 Pname
:= Find_Prim_Op
(U_Type
, TSS_Stream_Read
);
3716 -- All other record type cases, including protected records. The
3717 -- latter only arise for expander generated code for handling
3718 -- shared passive partition access.
3722 (Is_Record_Type
(U_Type
) or else Is_Protected_Type
(U_Type
));
3724 -- Ada 2005 (AI-216): Program_Error is raised when executing
3725 -- the default implementation of the Read attribute of an
3726 -- Unchecked_Union type.
3728 if Is_Unchecked_Union
(Base_Type
(U_Type
)) then
3730 Make_Raise_Program_Error
(Loc
,
3731 Reason
=> PE_Unchecked_Union_Restriction
));
3734 if Has_Discriminants
(U_Type
)
3736 (Discriminant_Default_Value
(First_Discriminant
(U_Type
)))
3738 Build_Mutable_Record_Read_Procedure
3739 (Loc
, Base_Type
(U_Type
), Decl
, Pname
);
3741 Build_Record_Read_Procedure
3742 (Loc
, Base_Type
(U_Type
), Decl
, Pname
);
3745 -- Suppress checks, uninitialized or otherwise invalid
3746 -- data does not cause constraint errors to be raised for
3747 -- a complete record read.
3749 Insert_Action
(N
, Decl
, All_Checks
);
3753 Rewrite_Stream_Proc_Call
(Pname
);
3760 -- Transforms 'Remainder into a call to the floating-point attribute
3761 -- function Remainder in Fat_xxx (where xxx is the root type)
3763 when Attribute_Remainder
=>
3764 Expand_Fpt_Attribute_RR
(N
);
3770 -- Transform 'Result into reference to _Result formal. At the point
3771 -- where a legal 'Result attribute is expanded, we know that we are in
3772 -- the context of a _Postcondition function with a _Result parameter.
3774 when Attribute_Result
=>
3776 Make_Identifier
(Loc
,
3777 Chars
=> Name_uResult
));
3778 Analyze_And_Resolve
(N
, Typ
);
3784 -- The handling of the Round attribute is quite delicate. The processing
3785 -- in Sem_Attr introduced a conversion to universal real, reflecting the
3786 -- semantics of Round, but we do not want anything to do with universal
3787 -- real at runtime, since this corresponds to using floating-point
3790 -- What we have now is that the Etype of the Round attribute correctly
3791 -- indicates the final result type. The operand of the Round is the
3792 -- conversion to universal real, described above, and the operand of
3793 -- this conversion is the actual operand of Round, which may be the
3794 -- special case of a fixed point multiplication or division (Etype =
3797 -- The exapander will expand first the operand of the conversion, then
3798 -- the conversion, and finally the round attribute itself, since we
3799 -- always work inside out. But we cannot simply process naively in this
3800 -- order. In the semantic world where universal fixed and real really
3801 -- exist and have infinite precision, there is no problem, but in the
3802 -- implementation world, where universal real is a floating-point type,
3803 -- we would get the wrong result.
3805 -- So the approach is as follows. First, when expanding a multiply or
3806 -- divide whose type is universal fixed, we do nothing at all, instead
3807 -- deferring the operation till later.
3809 -- The actual processing is done in Expand_N_Type_Conversion which
3810 -- handles the special case of Round by looking at its parent to see if
3811 -- it is a Round attribute, and if it is, handling the conversion (or
3812 -- its fixed multiply/divide child) in an appropriate manner.
3814 -- This means that by the time we get to expanding the Round attribute
3815 -- itself, the Round is nothing more than a type conversion (and will
3816 -- often be a null type conversion), so we just replace it with the
3817 -- appropriate conversion operation.
3819 when Attribute_Round
=>
3821 Convert_To
(Etype
(N
), Relocate_Node
(First
(Exprs
))));
3822 Analyze_And_Resolve
(N
);
3828 -- Transforms 'Rounding into a call to the floating-point attribute
3829 -- function Rounding in Fat_xxx (where xxx is the root type)
3831 when Attribute_Rounding
=>
3832 Expand_Fpt_Attribute_R
(N
);
3838 -- Transforms 'Scaling into a call to the floating-point attribute
3839 -- function Scaling in Fat_xxx (where xxx is the root type)
3841 when Attribute_Scaling
=>
3842 Expand_Fpt_Attribute_RI
(N
);
3848 when Attribute_Size |
3849 Attribute_Object_Size |
3850 Attribute_Value_Size |
3851 Attribute_VADS_Size
=> Size
:
3858 -- Processing for VADS_Size case. Note that this processing removes
3859 -- all traces of VADS_Size from the tree, and completes all required
3860 -- processing for VADS_Size by translating the attribute reference
3861 -- to an appropriate Size or Object_Size reference.
3863 if Id
= Attribute_VADS_Size
3864 or else (Use_VADS_Size
and then Id
= Attribute_Size
)
3866 -- If the size is specified, then we simply use the specified
3867 -- size. This applies to both types and objects. The size of an
3868 -- object can be specified in the following ways:
3870 -- An explicit size object is given for an object
3871 -- A component size is specified for an indexed component
3872 -- A component clause is specified for a selected component
3873 -- The object is a component of a packed composite object
3875 -- If the size is specified, then VADS_Size of an object
3877 if (Is_Entity_Name
(Pref
)
3878 and then Present
(Size_Clause
(Entity
(Pref
))))
3880 (Nkind
(Pref
) = N_Component_Clause
3881 and then (Present
(Component_Clause
3882 (Entity
(Selector_Name
(Pref
))))
3883 or else Is_Packed
(Etype
(Prefix
(Pref
)))))
3885 (Nkind
(Pref
) = N_Indexed_Component
3886 and then (Component_Size
(Etype
(Prefix
(Pref
))) /= 0
3887 or else Is_Packed
(Etype
(Prefix
(Pref
)))))
3889 Set_Attribute_Name
(N
, Name_Size
);
3891 -- Otherwise if we have an object rather than a type, then the
3892 -- VADS_Size attribute applies to the type of the object, rather
3893 -- than the object itself. This is one of the respects in which
3894 -- VADS_Size differs from Size.
3897 if (not Is_Entity_Name
(Pref
)
3898 or else not Is_Type
(Entity
(Pref
)))
3899 and then (Is_Scalar_Type
(Ptyp
) or else Is_Constrained
(Ptyp
))
3901 Rewrite
(Pref
, New_Occurrence_Of
(Ptyp
, Loc
));
3904 -- For a scalar type for which no size was explicitly given,
3905 -- VADS_Size means Object_Size. This is the other respect in
3906 -- which VADS_Size differs from Size.
3908 if Is_Scalar_Type
(Ptyp
) and then No
(Size_Clause
(Ptyp
)) then
3909 Set_Attribute_Name
(N
, Name_Object_Size
);
3911 -- In all other cases, Size and VADS_Size are the sane
3914 Set_Attribute_Name
(N
, Name_Size
);
3919 -- For class-wide types, X'Class'Size is transformed into a direct
3920 -- reference to the Size of the class type, so that the back end does
3921 -- not have to deal with the X'Class'Size reference.
3923 if Is_Entity_Name
(Pref
)
3924 and then Is_Class_Wide_Type
(Entity
(Pref
))
3926 Rewrite
(Prefix
(N
), New_Occurrence_Of
(Entity
(Pref
), Loc
));
3929 -- For X'Size applied to an object of a class-wide type, transform
3930 -- X'Size into a call to the primitive operation _Size applied to X.
3932 elsif Is_Class_Wide_Type
(Ptyp
)
3933 or else (Id
= Attribute_Size
3934 and then Is_Tagged_Type
(Ptyp
)
3935 and then Has_Unknown_Discriminants
(Ptyp
))
3937 -- No need to do anything else compiling under restriction
3938 -- No_Dispatching_Calls. During the semantic analysis we
3939 -- already notified such violation.
3941 if Restriction_Active
(No_Dispatching_Calls
) then
3946 Make_Function_Call
(Loc
,
3947 Name
=> New_Reference_To
3948 (Find_Prim_Op
(Ptyp
, Name_uSize
), Loc
),
3949 Parameter_Associations
=> New_List
(Pref
));
3951 if Typ
/= Standard_Long_Long_Integer
then
3953 -- The context is a specific integer type with which the
3954 -- original attribute was compatible. The function has a
3955 -- specific type as well, so to preserve the compatibility
3956 -- we must convert explicitly.
3958 New_Node
:= Convert_To
(Typ
, New_Node
);
3961 Rewrite
(N
, New_Node
);
3962 Analyze_And_Resolve
(N
, Typ
);
3965 -- Case of known RM_Size of a type
3967 elsif (Id
= Attribute_Size
or else Id
= Attribute_Value_Size
)
3968 and then Is_Entity_Name
(Pref
)
3969 and then Is_Type
(Entity
(Pref
))
3970 and then Known_Static_RM_Size
(Entity
(Pref
))
3972 Siz
:= RM_Size
(Entity
(Pref
));
3974 -- Case of known Esize of a type
3976 elsif Id
= Attribute_Object_Size
3977 and then Is_Entity_Name
(Pref
)
3978 and then Is_Type
(Entity
(Pref
))
3979 and then Known_Static_Esize
(Entity
(Pref
))
3981 Siz
:= Esize
(Entity
(Pref
));
3983 -- Case of known size of object
3985 elsif Id
= Attribute_Size
3986 and then Is_Entity_Name
(Pref
)
3987 and then Is_Object
(Entity
(Pref
))
3988 and then Known_Esize
(Entity
(Pref
))
3989 and then Known_Static_Esize
(Entity
(Pref
))
3991 Siz
:= Esize
(Entity
(Pref
));
3993 -- For an array component, we can do Size in the front end
3994 -- if the component_size of the array is set.
3996 elsif Nkind
(Pref
) = N_Indexed_Component
then
3997 Siz
:= Component_Size
(Etype
(Prefix
(Pref
)));
3999 -- For a record component, we can do Size in the front end if there
4000 -- is a component clause, or if the record is packed and the
4001 -- component's size is known at compile time.
4003 elsif Nkind
(Pref
) = N_Selected_Component
then
4005 Rec
: constant Entity_Id
:= Etype
(Prefix
(Pref
));
4006 Comp
: constant Entity_Id
:= Entity
(Selector_Name
(Pref
));
4009 if Present
(Component_Clause
(Comp
)) then
4010 Siz
:= Esize
(Comp
);
4012 elsif Is_Packed
(Rec
) then
4013 Siz
:= RM_Size
(Ptyp
);
4016 Apply_Universal_Integer_Attribute_Checks
(N
);
4021 -- All other cases are handled by the back end
4024 Apply_Universal_Integer_Attribute_Checks
(N
);
4026 -- If Size is applied to a formal parameter that is of a packed
4027 -- array subtype, then apply Size to the actual subtype.
4029 if Is_Entity_Name
(Pref
)
4030 and then Is_Formal
(Entity
(Pref
))
4031 and then Is_Array_Type
(Ptyp
)
4032 and then Is_Packed
(Ptyp
)
4035 Make_Attribute_Reference
(Loc
,
4037 New_Occurrence_Of
(Get_Actual_Subtype
(Pref
), Loc
),
4038 Attribute_Name
=> Name_Size
));
4039 Analyze_And_Resolve
(N
, Typ
);
4042 -- If Size applies to a dereference of an access to unconstrained
4043 -- packed array, the back end needs to see its unconstrained
4044 -- nominal type, but also a hint to the actual constrained type.
4046 if Nkind
(Pref
) = N_Explicit_Dereference
4047 and then Is_Array_Type
(Ptyp
)
4048 and then not Is_Constrained
(Ptyp
)
4049 and then Is_Packed
(Ptyp
)
4051 Set_Actual_Designated_Subtype
(Pref
,
4052 Get_Actual_Subtype
(Pref
));
4058 -- Common processing for record and array component case
4060 if Siz
/= No_Uint
and then Siz
/= 0 then
4062 CS
: constant Boolean := Comes_From_Source
(N
);
4065 Rewrite
(N
, Make_Integer_Literal
(Loc
, Siz
));
4067 -- This integer literal is not a static expression. We do not
4068 -- call Analyze_And_Resolve here, because this would activate
4069 -- the circuit for deciding that a static value was out of
4070 -- range, and we don't want that.
4072 -- So just manually set the type, mark the expression as non-
4073 -- static, and then ensure that the result is checked properly
4074 -- if the attribute comes from source (if it was internally
4075 -- generated, we never need a constraint check).
4078 Set_Is_Static_Expression
(N
, False);
4081 Apply_Constraint_Check
(N
, Typ
);
4091 when Attribute_Storage_Pool
=>
4093 Make_Type_Conversion
(Loc
,
4094 Subtype_Mark
=> New_Reference_To
(Etype
(N
), Loc
),
4095 Expression
=> New_Reference_To
(Entity
(N
), Loc
)));
4096 Analyze_And_Resolve
(N
, Typ
);
4102 when Attribute_Storage_Size
=> Storage_Size
: begin
4104 -- Access type case, always go to the root type
4106 -- The case of access types results in a value of zero for the case
4107 -- where no storage size attribute clause has been given. If a
4108 -- storage size has been given, then the attribute is converted
4109 -- to a reference to the variable used to hold this value.
4111 if Is_Access_Type
(Ptyp
) then
4112 if Present
(Storage_Size_Variable
(Root_Type
(Ptyp
))) then
4114 Make_Attribute_Reference
(Loc
,
4115 Prefix
=> New_Reference_To
(Typ
, Loc
),
4116 Attribute_Name
=> Name_Max
,
4117 Expressions
=> New_List
(
4118 Make_Integer_Literal
(Loc
, 0),
4121 (Storage_Size_Variable
(Root_Type
(Ptyp
)), Loc
)))));
4123 elsif Present
(Associated_Storage_Pool
(Root_Type
(Ptyp
))) then
4126 Make_Function_Call
(Loc
,
4130 (Etype
(Associated_Storage_Pool
(Root_Type
(Ptyp
))),
4131 Attribute_Name
(N
)),
4134 Parameter_Associations
=> New_List
(
4136 (Associated_Storage_Pool
(Root_Type
(Ptyp
)), Loc
)))));
4139 Rewrite
(N
, Make_Integer_Literal
(Loc
, 0));
4142 Analyze_And_Resolve
(N
, Typ
);
4144 -- For tasks, we retrieve the size directly from the TCB. The
4145 -- size may depend on a discriminant of the type, and therefore
4146 -- can be a per-object expression, so type-level information is
4147 -- not sufficient in general. There are four cases to consider:
4149 -- a) If the attribute appears within a task body, the designated
4150 -- TCB is obtained by a call to Self.
4152 -- b) If the prefix of the attribute is the name of a task object,
4153 -- the designated TCB is the one stored in the corresponding record.
4155 -- c) If the prefix is a task type, the size is obtained from the
4156 -- size variable created for each task type
4158 -- d) If no storage_size was specified for the type , there is no
4159 -- size variable, and the value is a system-specific default.
4162 if In_Open_Scopes
(Ptyp
) then
4164 -- Storage_Size (Self)
4168 Make_Function_Call
(Loc
,
4170 New_Occurrence_Of
(RTE
(RE_Storage_Size
), Loc
),
4171 Parameter_Associations
=>
4173 Make_Function_Call
(Loc
,
4175 New_Reference_To
(RTE
(RE_Self
), Loc
))))));
4177 elsif not Is_Entity_Name
(Pref
)
4178 or else not Is_Type
(Entity
(Pref
))
4180 -- Storage_Size (Rec (Obj).Size)
4184 Make_Function_Call
(Loc
,
4186 New_Occurrence_Of
(RTE
(RE_Storage_Size
), Loc
),
4187 Parameter_Associations
=>
4189 Make_Selected_Component
(Loc
,
4191 Unchecked_Convert_To
(
4192 Corresponding_Record_Type
(Ptyp
),
4193 New_Copy_Tree
(Pref
)),
4195 Make_Identifier
(Loc
, Name_uTask_Id
))))));
4197 elsif Present
(Storage_Size_Variable
(Ptyp
)) then
4199 -- Static storage size pragma given for type: retrieve value
4200 -- from its allocated storage variable.
4204 Make_Function_Call
(Loc
,
4205 Name
=> New_Occurrence_Of
(
4206 RTE
(RE_Adjust_Storage_Size
), Loc
),
4207 Parameter_Associations
=>
4210 Storage_Size_Variable
(Ptyp
), Loc
)))));
4212 -- Get system default
4216 Make_Function_Call
(Loc
,
4219 RTE
(RE_Default_Stack_Size
), Loc
))));
4222 Analyze_And_Resolve
(N
, Typ
);
4230 when Attribute_Stream_Size
=> Stream_Size
: declare
4234 -- If we have a Stream_Size clause for this type use it, otherwise
4235 -- the Stream_Size if the size of the type.
4237 if Has_Stream_Size_Clause
(Ptyp
) then
4240 (Static_Integer
(Expression
(Stream_Size_Clause
(Ptyp
))));
4242 Size
:= UI_To_Int
(Esize
(Ptyp
));
4245 Rewrite
(N
, Make_Integer_Literal
(Loc
, Intval
=> Size
));
4246 Analyze_And_Resolve
(N
, Typ
);
4253 -- 1. Deal with enumeration types with holes
4254 -- 2. For floating-point, generate call to attribute function
4255 -- 3. For other cases, deal with constraint checking
4257 when Attribute_Succ
=> Succ
:
4259 Etyp
: constant Entity_Id
:= Base_Type
(Ptyp
);
4263 -- For enumeration types with non-standard representations, we
4264 -- expand typ'Succ (x) into
4266 -- Pos_To_Rep (Rep_To_Pos (x) + 1)
4268 -- If the representation is contiguous, we compute instead
4269 -- Lit1 + Rep_to_Pos (x+1), to catch invalid representations.
4271 if Is_Enumeration_Type
(Ptyp
)
4272 and then Present
(Enum_Pos_To_Rep
(Etyp
))
4274 if Has_Contiguous_Rep
(Etyp
) then
4276 Unchecked_Convert_To
(Ptyp
,
4279 Make_Integer_Literal
(Loc
,
4280 Enumeration_Rep
(First_Literal
(Ptyp
))),
4282 Make_Function_Call
(Loc
,
4285 (TSS
(Etyp
, TSS_Rep_To_Pos
), Loc
),
4287 Parameter_Associations
=>
4289 Unchecked_Convert_To
(Ptyp
,
4292 Unchecked_Convert_To
(Standard_Integer
,
4293 Relocate_Node
(First
(Exprs
))),
4295 Make_Integer_Literal
(Loc
, 1))),
4296 Rep_To_Pos_Flag
(Ptyp
, Loc
))))));
4298 -- Add Boolean parameter True, to request program errror if
4299 -- we have a bad representation on our hands. Add False if
4300 -- checks are suppressed.
4302 Append_To
(Exprs
, Rep_To_Pos_Flag
(Ptyp
, Loc
));
4304 Make_Indexed_Component
(Loc
,
4307 (Enum_Pos_To_Rep
(Etyp
), Loc
),
4308 Expressions
=> New_List
(
4311 Make_Function_Call
(Loc
,
4314 (TSS
(Etyp
, TSS_Rep_To_Pos
), Loc
),
4315 Parameter_Associations
=> Exprs
),
4316 Right_Opnd
=> Make_Integer_Literal
(Loc
, 1)))));
4319 Analyze_And_Resolve
(N
, Typ
);
4321 -- For floating-point, we transform 'Succ into a call to the Succ
4322 -- floating-point attribute function in Fat_xxx (xxx is root type)
4324 elsif Is_Floating_Point_Type
(Ptyp
) then
4325 Expand_Fpt_Attribute_R
(N
);
4326 Analyze_And_Resolve
(N
, Typ
);
4328 -- For modular types, nothing to do (no overflow, since wraps)
4330 elsif Is_Modular_Integer_Type
(Ptyp
) then
4333 -- For other types, if argument is marked as needing a range check or
4334 -- overflow checking is enabled, we must generate a check.
4336 elsif not Overflow_Checks_Suppressed
(Ptyp
)
4337 or else Do_Range_Check
(First
(Exprs
))
4339 Set_Do_Range_Check
(First
(Exprs
), False);
4340 Expand_Pred_Succ
(N
);
4348 -- Transforms X'Tag into a direct reference to the tag of X
4350 when Attribute_Tag
=> Tag
:
4353 Prefix_Is_Type
: Boolean;
4356 if Is_Entity_Name
(Pref
) and then Is_Type
(Entity
(Pref
)) then
4357 Ttyp
:= Entity
(Pref
);
4358 Prefix_Is_Type
:= True;
4361 Prefix_Is_Type
:= False;
4364 if Is_Class_Wide_Type
(Ttyp
) then
4365 Ttyp
:= Root_Type
(Ttyp
);
4368 Ttyp
:= Underlying_Type
(Ttyp
);
4370 -- Ada 2005: The type may be a synchronized tagged type, in which
4371 -- case the tag information is stored in the corresponding record.
4373 if Is_Concurrent_Type
(Ttyp
) then
4374 Ttyp
:= Corresponding_Record_Type
(Ttyp
);
4377 if Prefix_Is_Type
then
4379 -- For VMs we leave the type attribute unexpanded because
4380 -- there's not a dispatching table to reference.
4382 if Tagged_Type_Expansion
then
4384 Unchecked_Convert_To
(RTE
(RE_Tag
),
4386 (Node
(First_Elmt
(Access_Disp_Table
(Ttyp
))), Loc
)));
4387 Analyze_And_Resolve
(N
, RTE
(RE_Tag
));
4390 -- Ada 2005 (AI-251): The use of 'Tag in the sources always
4391 -- references the primary tag of the actual object. If 'Tag is
4392 -- applied to class-wide interface objects we generate code that
4393 -- displaces "this" to reference the base of the object.
4395 elsif Comes_From_Source
(N
)
4396 and then Is_Class_Wide_Type
(Etype
(Prefix
(N
)))
4397 and then Is_Interface
(Etype
(Prefix
(N
)))
4400 -- (To_Tag_Ptr (Prefix'Address)).all
4402 -- Note that Prefix'Address is recursively expanded into a call
4403 -- to Base_Address (Obj.Tag)
4405 -- Not needed for VM targets, since all handled by the VM
4407 if Tagged_Type_Expansion
then
4409 Make_Explicit_Dereference
(Loc
,
4410 Unchecked_Convert_To
(RTE
(RE_Tag_Ptr
),
4411 Make_Attribute_Reference
(Loc
,
4412 Prefix
=> Relocate_Node
(Pref
),
4413 Attribute_Name
=> Name_Address
))));
4414 Analyze_And_Resolve
(N
, RTE
(RE_Tag
));
4419 Make_Selected_Component
(Loc
,
4420 Prefix
=> Relocate_Node
(Pref
),
4422 New_Reference_To
(First_Tag_Component
(Ttyp
), Loc
)));
4423 Analyze_And_Resolve
(N
, RTE
(RE_Tag
));
4431 -- Transforms 'Terminated attribute into a call to Terminated function
4433 when Attribute_Terminated
=> Terminated
:
4435 -- The prefix of Terminated is of a task interface class-wide type.
4437 -- terminated (Task_Id (Pref._disp_get_task_id));
4439 if Ada_Version
>= Ada_05
4440 and then Ekind
(Ptyp
) = E_Class_Wide_Type
4441 and then Is_Interface
(Ptyp
)
4442 and then Is_Task_Interface
(Ptyp
)
4445 Make_Function_Call
(Loc
,
4447 New_Reference_To
(RTE
(RE_Terminated
), Loc
),
4448 Parameter_Associations
=> New_List
(
4449 Make_Unchecked_Type_Conversion
(Loc
,
4451 New_Reference_To
(RTE
(RO_ST_Task_Id
), Loc
),
4453 Make_Selected_Component
(Loc
,
4455 New_Copy_Tree
(Pref
),
4457 Make_Identifier
(Loc
, Name_uDisp_Get_Task_Id
))))));
4459 elsif Restricted_Profile
then
4461 Build_Call_With_Task
(Pref
, RTE
(RE_Restricted_Terminated
)));
4465 Build_Call_With_Task
(Pref
, RTE
(RE_Terminated
)));
4468 Analyze_And_Resolve
(N
, Standard_Boolean
);
4475 -- Transforms System'To_Address (X) into unchecked conversion
4476 -- from (integral) type of X to type address.
4478 when Attribute_To_Address
=>
4480 Unchecked_Convert_To
(RTE
(RE_Address
),
4481 Relocate_Node
(First
(Exprs
))));
4482 Analyze_And_Resolve
(N
, RTE
(RE_Address
));
4488 when Attribute_To_Any
=> To_Any
: declare
4489 P_Type
: constant Entity_Id
:= Etype
(Pref
);
4490 Decls
: constant List_Id
:= New_List
;
4494 (Convert_To
(P_Type
,
4495 Relocate_Node
(First
(Exprs
))), Decls
));
4496 Insert_Actions
(N
, Decls
);
4497 Analyze_And_Resolve
(N
, RTE
(RE_Any
));
4504 -- Transforms 'Truncation into a call to the floating-point attribute
4505 -- function Truncation in Fat_xxx (where xxx is the root type).
4506 -- Expansion is avoided for cases the back end can handle directly.
4508 when Attribute_Truncation
=>
4509 if not Is_Inline_Floating_Point_Attribute
(N
) then
4510 Expand_Fpt_Attribute_R
(N
);
4517 when Attribute_TypeCode
=> TypeCode
: declare
4518 P_Type
: constant Entity_Id
:= Etype
(Pref
);
4519 Decls
: constant List_Id
:= New_List
;
4521 Rewrite
(N
, Build_TypeCode_Call
(Loc
, P_Type
, Decls
));
4522 Insert_Actions
(N
, Decls
);
4523 Analyze_And_Resolve
(N
, RTE
(RE_TypeCode
));
4526 -----------------------
4527 -- Unbiased_Rounding --
4528 -----------------------
4530 -- Transforms 'Unbiased_Rounding into a call to the floating-point
4531 -- attribute function Unbiased_Rounding in Fat_xxx (where xxx is the
4532 -- root type). Expansion is avoided for cases the back end can handle
4535 when Attribute_Unbiased_Rounding
=>
4536 if not Is_Inline_Floating_Point_Attribute
(N
) then
4537 Expand_Fpt_Attribute_R
(N
);
4544 when Attribute_UET_Address
=> UET_Address
: declare
4545 Ent
: constant Entity_Id
:=
4546 Make_Defining_Identifier
(Loc
, New_Internal_Name
('T'));
4550 Make_Object_Declaration
(Loc
,
4551 Defining_Identifier
=> Ent
,
4552 Aliased_Present
=> True,
4553 Object_Definition
=>
4554 New_Occurrence_Of
(RTE
(RE_Address
), Loc
)));
4556 -- Construct name __gnat_xxx__SDP, where xxx is the unit name
4557 -- in normal external form.
4559 Get_External_Unit_Name_String
(Get_Unit_Name
(Pref
));
4560 Name_Buffer
(1 + 7 .. Name_Len
+ 7) := Name_Buffer
(1 .. Name_Len
);
4561 Name_Len
:= Name_Len
+ 7;
4562 Name_Buffer
(1 .. 7) := "__gnat_";
4563 Name_Buffer
(Name_Len
+ 1 .. Name_Len
+ 5) := "__SDP";
4564 Name_Len
:= Name_Len
+ 5;
4566 Set_Is_Imported
(Ent
);
4567 Set_Interface_Name
(Ent
,
4568 Make_String_Literal
(Loc
,
4569 Strval
=> String_From_Name_Buffer
));
4571 -- Set entity as internal to ensure proper Sprint output of its
4572 -- implicit importation.
4574 Set_Is_Internal
(Ent
);
4577 Make_Attribute_Reference
(Loc
,
4578 Prefix
=> New_Occurrence_Of
(Ent
, Loc
),
4579 Attribute_Name
=> Name_Address
));
4581 Analyze_And_Resolve
(N
, Typ
);
4588 -- The processing for VADS_Size is shared with Size
4594 -- For enumeration types with a standard representation, and for all
4595 -- other types, Val is handled by the back end. For enumeration types
4596 -- with a non-standard representation we use the _Pos_To_Rep array that
4597 -- was created when the type was frozen.
4599 when Attribute_Val
=> Val
:
4601 Etyp
: constant Entity_Id
:= Base_Type
(Entity
(Pref
));
4604 if Is_Enumeration_Type
(Etyp
)
4605 and then Present
(Enum_Pos_To_Rep
(Etyp
))
4607 if Has_Contiguous_Rep
(Etyp
) then
4609 Rep_Node
: constant Node_Id
:=
4610 Unchecked_Convert_To
(Etyp
,
4613 Make_Integer_Literal
(Loc
,
4614 Enumeration_Rep
(First_Literal
(Etyp
))),
4616 (Convert_To
(Standard_Integer
,
4617 Relocate_Node
(First
(Exprs
))))));
4621 Unchecked_Convert_To
(Etyp
,
4624 Make_Integer_Literal
(Loc
,
4625 Enumeration_Rep
(First_Literal
(Etyp
))),
4627 Make_Function_Call
(Loc
,
4630 (TSS
(Etyp
, TSS_Rep_To_Pos
), Loc
),
4631 Parameter_Associations
=> New_List
(
4633 Rep_To_Pos_Flag
(Etyp
, Loc
))))));
4638 Make_Indexed_Component
(Loc
,
4639 Prefix
=> New_Reference_To
(Enum_Pos_To_Rep
(Etyp
), Loc
),
4640 Expressions
=> New_List
(
4641 Convert_To
(Standard_Integer
,
4642 Relocate_Node
(First
(Exprs
))))));
4645 Analyze_And_Resolve
(N
, Typ
);
4647 -- If the argument is marked as requiring a range check then generate
4650 elsif Do_Range_Check
(First
(Exprs
)) then
4651 Set_Do_Range_Check
(First
(Exprs
), False);
4652 Generate_Range_Check
(First
(Exprs
), Etyp
, CE_Range_Check_Failed
);
4660 -- The code for valid is dependent on the particular types involved.
4661 -- See separate sections below for the generated code in each case.
4663 when Attribute_Valid
=> Valid
:
4665 Btyp
: Entity_Id
:= Base_Type
(Ptyp
);
4668 Save_Validity_Checks_On
: constant Boolean := Validity_Checks_On
;
4669 -- Save the validity checking mode. We always turn off validity
4670 -- checking during process of 'Valid since this is one place
4671 -- where we do not want the implicit validity checks to intefere
4672 -- with the explicit validity check that the programmer is doing.
4674 function Make_Range_Test
return Node_Id
;
4675 -- Build the code for a range test of the form
4676 -- Btyp!(Pref) >= Btyp!(Ptyp'First)
4678 -- Btyp!(Pref) <= Btyp!(Ptyp'Last)
4680 ---------------------
4681 -- Make_Range_Test --
4682 ---------------------
4684 function Make_Range_Test
return Node_Id
is
4691 Unchecked_Convert_To
(Btyp
, Duplicate_Subexpr
(Pref
)),
4694 Unchecked_Convert_To
(Btyp
,
4695 Make_Attribute_Reference
(Loc
,
4696 Prefix
=> New_Occurrence_Of
(Ptyp
, Loc
),
4697 Attribute_Name
=> Name_First
))),
4702 Unchecked_Convert_To
(Btyp
,
4703 Duplicate_Subexpr_No_Checks
(Pref
)),
4706 Unchecked_Convert_To
(Btyp
,
4707 Make_Attribute_Reference
(Loc
,
4708 Prefix
=> New_Occurrence_Of
(Ptyp
, Loc
),
4709 Attribute_Name
=> Name_Last
))));
4710 end Make_Range_Test
;
4712 -- Start of processing for Attribute_Valid
4715 -- Turn off validity checks. We do not want any implicit validity
4716 -- checks to intefere with the explicit check from the attribute
4718 Validity_Checks_On
:= False;
4720 -- Floating-point case. This case is handled by the Valid attribute
4721 -- code in the floating-point attribute run-time library.
4723 if Is_Floating_Point_Type
(Ptyp
) then
4729 -- For vax fpt types, call appropriate routine in special vax
4730 -- floating point unit. We do not have to worry about loads in
4731 -- this case, since these types have no signalling NaN's.
4733 if Vax_Float
(Btyp
) then
4734 Expand_Vax_Valid
(N
);
4736 -- The AAMP back end handles Valid for floating-point types
4738 elsif Is_AAMP_Float
(Btyp
) then
4739 Analyze_And_Resolve
(Pref
, Ptyp
);
4740 Set_Etype
(N
, Standard_Boolean
);
4743 -- Non VAX float case
4746 Find_Fat_Info
(Ptyp
, Ftp
, Pkg
);
4748 -- If the floating-point object might be unaligned, we need
4749 -- to call the special routine Unaligned_Valid, which makes
4750 -- the needed copy, being careful not to load the value into
4751 -- any floating-point register. The argument in this case is
4752 -- obj'Address (see Unaligned_Valid routine in Fat_Gen).
4754 if Is_Possibly_Unaligned_Object
(Pref
) then
4755 Expand_Fpt_Attribute
4756 (N
, Pkg
, Name_Unaligned_Valid
,
4758 Make_Attribute_Reference
(Loc
,
4759 Prefix
=> Relocate_Node
(Pref
),
4760 Attribute_Name
=> Name_Address
)));
4762 -- In the normal case where we are sure the object is
4763 -- aligned, we generate a call to Valid, and the argument in
4764 -- this case is obj'Unrestricted_Access (after converting
4765 -- obj to the right floating-point type).
4768 Expand_Fpt_Attribute
4769 (N
, Pkg
, Name_Valid
,
4771 Make_Attribute_Reference
(Loc
,
4772 Prefix
=> Unchecked_Convert_To
(Ftp
, Pref
),
4773 Attribute_Name
=> Name_Unrestricted_Access
)));
4777 -- One more task, we still need a range check. Required
4778 -- only if we have a constraint, since the Valid routine
4779 -- catches infinities properly (infinities are never valid).
4781 -- The way we do the range check is simply to create the
4782 -- expression: Valid (N) and then Base_Type(Pref) in Typ.
4784 if not Subtypes_Statically_Match
(Ptyp
, Btyp
) then
4787 Left_Opnd
=> Relocate_Node
(N
),
4790 Left_Opnd
=> Convert_To
(Btyp
, Pref
),
4791 Right_Opnd
=> New_Occurrence_Of
(Ptyp
, Loc
))));
4795 -- Enumeration type with holes
4797 -- For enumeration types with holes, the Pos value constructed by
4798 -- the Enum_Rep_To_Pos function built in Exp_Ch3 called with a
4799 -- second argument of False returns minus one for an invalid value,
4800 -- and the non-negative pos value for a valid value, so the
4801 -- expansion of X'Valid is simply:
4803 -- type(X)'Pos (X) >= 0
4805 -- We can't quite generate it that way because of the requirement
4806 -- for the non-standard second argument of False in the resulting
4807 -- rep_to_pos call, so we have to explicitly create:
4809 -- _rep_to_pos (X, False) >= 0
4811 -- If we have an enumeration subtype, we also check that the
4812 -- value is in range:
4814 -- _rep_to_pos (X, False) >= 0
4816 -- (X >= type(X)'First and then type(X)'Last <= X)
4818 elsif Is_Enumeration_Type
(Ptyp
)
4819 and then Present
(Enum_Pos_To_Rep
(Base_Type
(Ptyp
)))
4824 Make_Function_Call
(Loc
,
4827 (TSS
(Base_Type
(Ptyp
), TSS_Rep_To_Pos
), Loc
),
4828 Parameter_Associations
=> New_List
(
4830 New_Occurrence_Of
(Standard_False
, Loc
))),
4831 Right_Opnd
=> Make_Integer_Literal
(Loc
, 0));
4835 (Type_Low_Bound
(Ptyp
) /= Type_Low_Bound
(Btyp
)
4837 Type_High_Bound
(Ptyp
) /= Type_High_Bound
(Btyp
))
4839 -- The call to Make_Range_Test will create declarations
4840 -- that need a proper insertion point, but Pref is now
4841 -- attached to a node with no ancestor. Attach to tree
4842 -- even if it is to be rewritten below.
4844 Set_Parent
(Tst
, Parent
(N
));
4848 Left_Opnd
=> Make_Range_Test
,
4854 -- Fortran convention booleans
4856 -- For the very special case of Fortran convention booleans, the
4857 -- value is always valid, since it is an integer with the semantics
4858 -- that non-zero is true, and any value is permissible.
4860 elsif Is_Boolean_Type
(Ptyp
)
4861 and then Convention
(Ptyp
) = Convention_Fortran
4863 Rewrite
(N
, New_Occurrence_Of
(Standard_True
, Loc
));
4865 -- For biased representations, we will be doing an unchecked
4866 -- conversion without unbiasing the result. That means that the range
4867 -- test has to take this into account, and the proper form of the
4870 -- Btyp!(Pref) < Btyp!(Ptyp'Range_Length)
4872 elsif Has_Biased_Representation
(Ptyp
) then
4873 Btyp
:= RTE
(RE_Unsigned_32
);
4877 Unchecked_Convert_To
(Btyp
, Duplicate_Subexpr
(Pref
)),
4879 Unchecked_Convert_To
(Btyp
,
4880 Make_Attribute_Reference
(Loc
,
4881 Prefix
=> New_Occurrence_Of
(Ptyp
, Loc
),
4882 Attribute_Name
=> Name_Range_Length
))));
4884 -- For all other scalar types, what we want logically is a
4887 -- X in type(X)'First .. type(X)'Last
4889 -- But that's precisely what won't work because of possible
4890 -- unwanted optimization (and indeed the basic motivation for
4891 -- the Valid attribute is exactly that this test does not work!)
4892 -- What will work is:
4894 -- Btyp!(X) >= Btyp!(type(X)'First)
4896 -- Btyp!(X) <= Btyp!(type(X)'Last)
4898 -- where Btyp is an integer type large enough to cover the full
4899 -- range of possible stored values (i.e. it is chosen on the basis
4900 -- of the size of the type, not the range of the values). We write
4901 -- this as two tests, rather than a range check, so that static
4902 -- evaluation will easily remove either or both of the checks if
4903 -- they can be -statically determined to be true (this happens
4904 -- when the type of X is static and the range extends to the full
4905 -- range of stored values).
4907 -- Unsigned types. Note: it is safe to consider only whether the
4908 -- subtype is unsigned, since we will in that case be doing all
4909 -- unsigned comparisons based on the subtype range. Since we use the
4910 -- actual subtype object size, this is appropriate.
4912 -- For example, if we have
4914 -- subtype x is integer range 1 .. 200;
4915 -- for x'Object_Size use 8;
4917 -- Now the base type is signed, but objects of this type are bits
4918 -- unsigned, and doing an unsigned test of the range 1 to 200 is
4919 -- correct, even though a value greater than 127 looks signed to a
4920 -- signed comparison.
4922 elsif Is_Unsigned_Type
(Ptyp
) then
4923 if Esize
(Ptyp
) <= 32 then
4924 Btyp
:= RTE
(RE_Unsigned_32
);
4926 Btyp
:= RTE
(RE_Unsigned_64
);
4929 Rewrite
(N
, Make_Range_Test
);
4934 if Esize
(Ptyp
) <= Esize
(Standard_Integer
) then
4935 Btyp
:= Standard_Integer
;
4937 Btyp
:= Universal_Integer
;
4940 Rewrite
(N
, Make_Range_Test
);
4943 Analyze_And_Resolve
(N
, Standard_Boolean
);
4944 Validity_Checks_On
:= Save_Validity_Checks_On
;
4951 -- Value attribute is handled in separate unti Exp_Imgv
4953 when Attribute_Value
=>
4954 Exp_Imgv
.Expand_Value_Attribute
(N
);
4960 -- The processing for Value_Size shares the processing for Size
4966 -- The processing for Version shares the processing for Body_Version
4972 -- Wide_Image attribute is handled in separate unit Exp_Imgv
4974 when Attribute_Wide_Image
=>
4975 Exp_Imgv
.Expand_Wide_Image_Attribute
(N
);
4977 ---------------------
4978 -- Wide_Wide_Image --
4979 ---------------------
4981 -- Wide_Wide_Image attribute is handled in separate unit Exp_Imgv
4983 when Attribute_Wide_Wide_Image
=>
4984 Exp_Imgv
.Expand_Wide_Wide_Image_Attribute
(N
);
4990 -- We expand typ'Wide_Value (X) into
4993 -- (Wide_String_To_String (X, Wide_Character_Encoding_Method))
4995 -- Wide_String_To_String is a runtime function that converts its wide
4996 -- string argument to String, converting any non-translatable characters
4997 -- into appropriate escape sequences. This preserves the required
4998 -- semantics of Wide_Value in all cases, and results in a very simple
4999 -- implementation approach.
5001 -- Note: for this approach to be fully standard compliant for the cases
5002 -- where typ is Wide_Character and Wide_Wide_Character, the encoding
5003 -- method must cover the entire character range (e.g. UTF-8). But that
5004 -- is a reasonable requirement when dealing with encoded character
5005 -- sequences. Presumably if one of the restrictive encoding mechanisms
5006 -- is in use such as Shift-JIS, then characters that cannot be
5007 -- represented using this encoding will not appear in any case.
5009 when Attribute_Wide_Value
=> Wide_Value
:
5012 Make_Attribute_Reference
(Loc
,
5014 Attribute_Name
=> Name_Value
,
5016 Expressions
=> New_List
(
5017 Make_Function_Call
(Loc
,
5019 New_Reference_To
(RTE
(RE_Wide_String_To_String
), Loc
),
5021 Parameter_Associations
=> New_List
(
5022 Relocate_Node
(First
(Exprs
)),
5023 Make_Integer_Literal
(Loc
,
5024 Intval
=> Int
(Wide_Character_Encoding_Method
)))))));
5026 Analyze_And_Resolve
(N
, Typ
);
5029 ---------------------
5030 -- Wide_Wide_Value --
5031 ---------------------
5033 -- We expand typ'Wide_Value_Value (X) into
5036 -- (Wide_Wide_String_To_String (X, Wide_Character_Encoding_Method))
5038 -- Wide_Wide_String_To_String is a runtime function that converts its
5039 -- wide string argument to String, converting any non-translatable
5040 -- characters into appropriate escape sequences. This preserves the
5041 -- required semantics of Wide_Wide_Value in all cases, and results in a
5042 -- very simple implementation approach.
5044 -- It's not quite right where typ = Wide_Wide_Character, because the
5045 -- encoding method may not cover the whole character type ???
5047 when Attribute_Wide_Wide_Value
=> Wide_Wide_Value
:
5050 Make_Attribute_Reference
(Loc
,
5052 Attribute_Name
=> Name_Value
,
5054 Expressions
=> New_List
(
5055 Make_Function_Call
(Loc
,
5057 New_Reference_To
(RTE
(RE_Wide_Wide_String_To_String
), Loc
),
5059 Parameter_Associations
=> New_List
(
5060 Relocate_Node
(First
(Exprs
)),
5061 Make_Integer_Literal
(Loc
,
5062 Intval
=> Int
(Wide_Character_Encoding_Method
)))))));
5064 Analyze_And_Resolve
(N
, Typ
);
5065 end Wide_Wide_Value
;
5067 ---------------------
5068 -- Wide_Wide_Width --
5069 ---------------------
5071 -- Wide_Wide_Width attribute is handled in separate unit Exp_Imgv
5073 when Attribute_Wide_Wide_Width
=>
5074 Exp_Imgv
.Expand_Width_Attribute
(N
, Wide_Wide
);
5080 -- Wide_Width attribute is handled in separate unit Exp_Imgv
5082 when Attribute_Wide_Width
=>
5083 Exp_Imgv
.Expand_Width_Attribute
(N
, Wide
);
5089 -- Width attribute is handled in separate unit Exp_Imgv
5091 when Attribute_Width
=>
5092 Exp_Imgv
.Expand_Width_Attribute
(N
, Normal
);
5098 when Attribute_Write
=> Write
: declare
5099 P_Type
: constant Entity_Id
:= Entity
(Pref
);
5100 U_Type
: constant Entity_Id
:= Underlying_Type
(P_Type
);
5108 -- If no underlying type, we have an error that will be diagnosed
5109 -- elsewhere, so here we just completely ignore the expansion.
5115 -- The simple case, if there is a TSS for Write, just call it
5117 Pname
:= Find_Stream_Subprogram
(P_Type
, TSS_Stream_Write
);
5119 if Present
(Pname
) then
5123 -- If there is a Stream_Convert pragma, use it, we rewrite
5125 -- sourcetyp'Output (stream, Item)
5129 -- strmtyp'Output (Stream, strmwrite (acttyp (Item)));
5131 -- where strmwrite is the given Write function that converts an
5132 -- argument of type sourcetyp or a type acctyp, from which it is
5133 -- derived to type strmtyp. The conversion to acttyp is required
5134 -- for the derived case.
5136 Prag
:= Get_Stream_Convert_Pragma
(P_Type
);
5138 if Present
(Prag
) then
5140 Next
(Next
(First
(Pragma_Argument_Associations
(Prag
))));
5141 Wfunc
:= Entity
(Expression
(Arg3
));
5144 Make_Attribute_Reference
(Loc
,
5145 Prefix
=> New_Occurrence_Of
(Etype
(Wfunc
), Loc
),
5146 Attribute_Name
=> Name_Output
,
5147 Expressions
=> New_List
(
5148 Relocate_Node
(First
(Exprs
)),
5149 Make_Function_Call
(Loc
,
5150 Name
=> New_Occurrence_Of
(Wfunc
, Loc
),
5151 Parameter_Associations
=> New_List
(
5152 OK_Convert_To
(Etype
(First_Formal
(Wfunc
)),
5153 Relocate_Node
(Next
(First
(Exprs
)))))))));
5158 -- For elementary types, we call the W_xxx routine directly
5160 elsif Is_Elementary_Type
(U_Type
) then
5161 Rewrite
(N
, Build_Elementary_Write_Call
(N
));
5167 elsif Is_Array_Type
(U_Type
) then
5168 Build_Array_Write_Procedure
(N
, U_Type
, Decl
, Pname
);
5169 Compile_Stream_Body_In_Scope
(N
, Decl
, U_Type
, Check
=> False);
5171 -- Tagged type case, use the primitive Write function. Note that
5172 -- this will dispatch in the class-wide case which is what we want
5174 elsif Is_Tagged_Type
(U_Type
) then
5175 Pname
:= Find_Prim_Op
(U_Type
, TSS_Stream_Write
);
5177 -- All other record type cases, including protected records.
5178 -- The latter only arise for expander generated code for
5179 -- handling shared passive partition access.
5183 (Is_Record_Type
(U_Type
) or else Is_Protected_Type
(U_Type
));
5185 -- Ada 2005 (AI-216): Program_Error is raised when executing
5186 -- the default implementation of the Write attribute of an
5187 -- Unchecked_Union type. However, if the 'Write reference is
5188 -- within the generated Output stream procedure, Write outputs
5189 -- the components, and the default values of the discriminant
5190 -- are streamed by the Output procedure itself.
5192 if Is_Unchecked_Union
(Base_Type
(U_Type
))
5193 and not Is_TSS
(Current_Scope
, TSS_Stream_Output
)
5196 Make_Raise_Program_Error
(Loc
,
5197 Reason
=> PE_Unchecked_Union_Restriction
));
5200 if Has_Discriminants
(U_Type
)
5202 (Discriminant_Default_Value
(First_Discriminant
(U_Type
)))
5204 Build_Mutable_Record_Write_Procedure
5205 (Loc
, Base_Type
(U_Type
), Decl
, Pname
);
5207 Build_Record_Write_Procedure
5208 (Loc
, Base_Type
(U_Type
), Decl
, Pname
);
5211 Insert_Action
(N
, Decl
);
5215 -- If we fall through, Pname is the procedure to be called
5217 Rewrite_Stream_Proc_Call
(Pname
);
5220 -- Component_Size is handled by the back end, unless the component size
5221 -- is known at compile time, which is always true in the packed array
5222 -- case. It is important that the packed array case is handled in the
5223 -- front end (see Eval_Attribute) since the back end would otherwise get
5224 -- confused by the equivalent packed array type.
5226 when Attribute_Component_Size
=>
5229 -- The following attributes are handled by the back end (except that
5230 -- static cases have already been evaluated during semantic processing,
5231 -- but in any case the back end should not count on this). The one bit
5232 -- of special processing required is that these attributes typically
5233 -- generate conditionals in the code, so we need to check the relevant
5236 when Attribute_Max |
5238 Check_Restriction
(No_Implicit_Conditionals
, N
);
5240 -- The following attributes are handled by the back end (except that
5241 -- static cases have already been evaluated during semantic processing,
5242 -- but in any case the back end should not count on this).
5244 -- The back end also handles the non-class-wide cases of Size
5246 when Attribute_Bit_Order |
5247 Attribute_Code_Address |
5248 Attribute_Definite |
5249 Attribute_Null_Parameter |
5250 Attribute_Passed_By_Reference |
5251 Attribute_Pool_Address
=>
5254 -- The following attributes are also handled by the back end, but return
5255 -- a universal integer result, so may need a conversion for checking
5256 -- that the result is in range.
5258 when Attribute_Aft |
5260 Attribute_Max_Size_In_Storage_Elements
5262 Apply_Universal_Integer_Attribute_Checks
(N
);
5264 -- The following attributes should not appear at this stage, since they
5265 -- have already been handled by the analyzer (and properly rewritten
5266 -- with corresponding values or entities to represent the right values)
5268 when Attribute_Abort_Signal |
5269 Attribute_Address_Size |
5272 Attribute_Compiler_Version |
5273 Attribute_Default_Bit_Order |
5280 Attribute_Fast_Math |
5281 Attribute_Has_Access_Values |
5282 Attribute_Has_Discriminants |
5283 Attribute_Has_Tagged_Values |
5285 Attribute_Machine_Emax |
5286 Attribute_Machine_Emin |
5287 Attribute_Machine_Mantissa |
5288 Attribute_Machine_Overflows |
5289 Attribute_Machine_Radix |
5290 Attribute_Machine_Rounds |
5291 Attribute_Maximum_Alignment |
5292 Attribute_Model_Emin |
5293 Attribute_Model_Epsilon |
5294 Attribute_Model_Mantissa |
5295 Attribute_Model_Small |
5297 Attribute_Partition_ID |
5299 Attribute_Safe_Emax |
5300 Attribute_Safe_First |
5301 Attribute_Safe_Large |
5302 Attribute_Safe_Last |
5303 Attribute_Safe_Small |
5305 Attribute_Signed_Zeros |
5307 Attribute_Storage_Unit |
5308 Attribute_Stub_Type |
5309 Attribute_Target_Name |
5310 Attribute_Type_Class |
5311 Attribute_Unconstrained_Array |
5312 Attribute_Universal_Literal_String |
5313 Attribute_Wchar_T_Size |
5314 Attribute_Word_Size
=>
5316 raise Program_Error
;
5318 -- The Asm_Input and Asm_Output attributes are not expanded at this
5319 -- stage, but will be eliminated in the expansion of the Asm call, see
5320 -- Exp_Intr for details. So the back end will never see these either.
5322 when Attribute_Asm_Input |
5323 Attribute_Asm_Output
=>
5330 when RE_Not_Available
=>
5332 end Expand_N_Attribute_Reference
;
5334 ----------------------
5335 -- Expand_Pred_Succ --
5336 ----------------------
5338 -- For typ'Pred (exp), we generate the check
5340 -- [constraint_error when exp = typ'Base'First]
5342 -- Similarly, for typ'Succ (exp), we generate the check
5344 -- [constraint_error when exp = typ'Base'Last]
5346 -- These checks are not generated for modular types, since the proper
5347 -- semantics for Succ and Pred on modular types is to wrap, not raise CE.
5349 procedure Expand_Pred_Succ
(N
: Node_Id
) is
5350 Loc
: constant Source_Ptr
:= Sloc
(N
);
5354 if Attribute_Name
(N
) = Name_Pred
then
5361 Make_Raise_Constraint_Error
(Loc
,
5365 Duplicate_Subexpr_Move_Checks
(First
(Expressions
(N
))),
5367 Make_Attribute_Reference
(Loc
,
5369 New_Reference_To
(Base_Type
(Etype
(Prefix
(N
))), Loc
),
5370 Attribute_Name
=> Cnam
)),
5371 Reason
=> CE_Overflow_Check_Failed
));
5372 end Expand_Pred_Succ
;
5378 procedure Find_Fat_Info
5380 Fat_Type
: out Entity_Id
;
5381 Fat_Pkg
: out RE_Id
)
5383 Btyp
: constant Entity_Id
:= Base_Type
(T
);
5384 Rtyp
: constant Entity_Id
:= Root_Type
(T
);
5385 Digs
: constant Nat
:= UI_To_Int
(Digits_Value
(Btyp
));
5388 -- If the base type is VAX float, then get appropriate VAX float type
5390 if Vax_Float
(Btyp
) then
5393 Fat_Type
:= RTE
(RE_Fat_VAX_F
);
5394 Fat_Pkg
:= RE_Attr_VAX_F_Float
;
5397 Fat_Type
:= RTE
(RE_Fat_VAX_D
);
5398 Fat_Pkg
:= RE_Attr_VAX_D_Float
;
5401 Fat_Type
:= RTE
(RE_Fat_VAX_G
);
5402 Fat_Pkg
:= RE_Attr_VAX_G_Float
;
5405 raise Program_Error
;
5408 -- If root type is VAX float, this is the case where the library has
5409 -- been recompiled in VAX float mode, and we have an IEEE float type.
5410 -- This is when we use the special IEEE Fat packages.
5412 elsif Vax_Float
(Rtyp
) then
5415 Fat_Type
:= RTE
(RE_Fat_IEEE_Short
);
5416 Fat_Pkg
:= RE_Attr_IEEE_Short
;
5419 Fat_Type
:= RTE
(RE_Fat_IEEE_Long
);
5420 Fat_Pkg
:= RE_Attr_IEEE_Long
;
5423 raise Program_Error
;
5426 -- If neither the base type nor the root type is VAX_Float then VAX
5427 -- float is out of the picture, and we can just use the root type.
5432 if Fat_Type
= Standard_Short_Float
then
5433 Fat_Pkg
:= RE_Attr_Short_Float
;
5435 elsif Fat_Type
= Standard_Float
then
5436 Fat_Pkg
:= RE_Attr_Float
;
5438 elsif Fat_Type
= Standard_Long_Float
then
5439 Fat_Pkg
:= RE_Attr_Long_Float
;
5441 elsif Fat_Type
= Standard_Long_Long_Float
then
5442 Fat_Pkg
:= RE_Attr_Long_Long_Float
;
5444 -- Universal real (which is its own root type) is treated as being
5445 -- equivalent to Standard.Long_Long_Float, since it is defined to
5446 -- have the same precision as the longest Float type.
5448 elsif Fat_Type
= Universal_Real
then
5449 Fat_Type
:= Standard_Long_Long_Float
;
5450 Fat_Pkg
:= RE_Attr_Long_Long_Float
;
5453 raise Program_Error
;
5458 ----------------------------
5459 -- Find_Stream_Subprogram --
5460 ----------------------------
5462 function Find_Stream_Subprogram
5464 Nam
: TSS_Name_Type
) return Entity_Id
5466 Base_Typ
: constant Entity_Id
:= Base_Type
(Typ
);
5467 Ent
: constant Entity_Id
:= TSS
(Typ
, Nam
);
5470 if Present
(Ent
) then
5474 -- Stream attributes for strings are expanded into library calls. The
5475 -- following checks are disabled when the run-time is not available or
5476 -- when compiling predefined types due to bootstrap issues. As a result,
5477 -- the compiler will generate in-place stream routines for string types
5478 -- that appear in GNAT's library, but will generate calls via rtsfind
5479 -- to library routines for user code.
5480 -- ??? For now, disable this code for JVM, since this generates a
5481 -- VerifyError exception at run-time on e.g. c330001.
5482 -- This is disabled for AAMP, to avoid making dependences on files not
5483 -- supported in the AAMP library (such as s-fileio.adb).
5485 if VM_Target
/= JVM_Target
5486 and then not AAMP_On_Target
5488 not Is_Predefined_File_Name
(Unit_File_Name
(Current_Sem_Unit
))
5490 -- String as defined in package Ada
5492 if Base_Typ
= Standard_String
then
5493 if Restriction_Active
(No_Stream_Optimizations
) then
5494 if Nam
= TSS_Stream_Input
then
5495 return RTE
(RE_String_Input
);
5497 elsif Nam
= TSS_Stream_Output
then
5498 return RTE
(RE_String_Output
);
5500 elsif Nam
= TSS_Stream_Read
then
5501 return RTE
(RE_String_Read
);
5503 else pragma Assert
(Nam
= TSS_Stream_Write
);
5504 return RTE
(RE_String_Write
);
5508 if Nam
= TSS_Stream_Input
then
5509 return RTE
(RE_String_Input_Blk_IO
);
5511 elsif Nam
= TSS_Stream_Output
then
5512 return RTE
(RE_String_Output_Blk_IO
);
5514 elsif Nam
= TSS_Stream_Read
then
5515 return RTE
(RE_String_Read_Blk_IO
);
5517 else pragma Assert
(Nam
= TSS_Stream_Write
);
5518 return RTE
(RE_String_Write_Blk_IO
);
5522 -- Wide_String as defined in package Ada
5524 elsif Base_Typ
= Standard_Wide_String
then
5525 if Restriction_Active
(No_Stream_Optimizations
) then
5526 if Nam
= TSS_Stream_Input
then
5527 return RTE
(RE_Wide_String_Input
);
5529 elsif Nam
= TSS_Stream_Output
then
5530 return RTE
(RE_Wide_String_Output
);
5532 elsif Nam
= TSS_Stream_Read
then
5533 return RTE
(RE_Wide_String_Read
);
5535 else pragma Assert
(Nam
= TSS_Stream_Write
);
5536 return RTE
(RE_Wide_String_Write
);
5540 if Nam
= TSS_Stream_Input
then
5541 return RTE
(RE_Wide_String_Input_Blk_IO
);
5543 elsif Nam
= TSS_Stream_Output
then
5544 return RTE
(RE_Wide_String_Output_Blk_IO
);
5546 elsif Nam
= TSS_Stream_Read
then
5547 return RTE
(RE_Wide_String_Read_Blk_IO
);
5549 else pragma Assert
(Nam
= TSS_Stream_Write
);
5550 return RTE
(RE_Wide_String_Write_Blk_IO
);
5554 -- Wide_Wide_String as defined in package Ada
5556 elsif Base_Typ
= Standard_Wide_Wide_String
then
5557 if Restriction_Active
(No_Stream_Optimizations
) then
5558 if Nam
= TSS_Stream_Input
then
5559 return RTE
(RE_Wide_Wide_String_Input
);
5561 elsif Nam
= TSS_Stream_Output
then
5562 return RTE
(RE_Wide_Wide_String_Output
);
5564 elsif Nam
= TSS_Stream_Read
then
5565 return RTE
(RE_Wide_Wide_String_Read
);
5567 else pragma Assert
(Nam
= TSS_Stream_Write
);
5568 return RTE
(RE_Wide_Wide_String_Write
);
5572 if Nam
= TSS_Stream_Input
then
5573 return RTE
(RE_Wide_Wide_String_Input_Blk_IO
);
5575 elsif Nam
= TSS_Stream_Output
then
5576 return RTE
(RE_Wide_Wide_String_Output_Blk_IO
);
5578 elsif Nam
= TSS_Stream_Read
then
5579 return RTE
(RE_Wide_Wide_String_Read_Blk_IO
);
5581 else pragma Assert
(Nam
= TSS_Stream_Write
);
5582 return RTE
(RE_Wide_Wide_String_Write_Blk_IO
);
5588 if Is_Tagged_Type
(Typ
)
5589 and then Is_Derived_Type
(Typ
)
5591 return Find_Prim_Op
(Typ
, Nam
);
5593 return Find_Inherited_TSS
(Typ
, Nam
);
5595 end Find_Stream_Subprogram
;
5597 -----------------------
5598 -- Get_Index_Subtype --
5599 -----------------------
5601 function Get_Index_Subtype
(N
: Node_Id
) return Node_Id
is
5602 P_Type
: Entity_Id
:= Etype
(Prefix
(N
));
5607 if Is_Access_Type
(P_Type
) then
5608 P_Type
:= Designated_Type
(P_Type
);
5611 if No
(Expressions
(N
)) then
5614 J
:= UI_To_Int
(Expr_Value
(First
(Expressions
(N
))));
5617 Indx
:= First_Index
(P_Type
);
5623 return Etype
(Indx
);
5624 end Get_Index_Subtype
;
5626 -------------------------------
5627 -- Get_Stream_Convert_Pragma --
5628 -------------------------------
5630 function Get_Stream_Convert_Pragma
(T
: Entity_Id
) return Node_Id
is
5635 -- Note: we cannot use Get_Rep_Pragma here because of the peculiarity
5636 -- that a stream convert pragma for a tagged type is not inherited from
5637 -- its parent. Probably what is wrong here is that it is basically
5638 -- incorrect to consider a stream convert pragma to be a representation
5639 -- pragma at all ???
5641 N
:= First_Rep_Item
(Implementation_Base_Type
(T
));
5642 while Present
(N
) loop
5643 if Nkind
(N
) = N_Pragma
5644 and then Pragma_Name
(N
) = Name_Stream_Convert
5646 -- For tagged types this pragma is not inherited, so we
5647 -- must verify that it is defined for the given type and
5651 Entity
(Expression
(First
(Pragma_Argument_Associations
(N
))));
5653 if not Is_Tagged_Type
(T
)
5655 or else (Is_Private_Type
(Typ
) and then T
= Full_View
(Typ
))
5665 end Get_Stream_Convert_Pragma
;
5667 ---------------------------------
5668 -- Is_Constrained_Packed_Array --
5669 ---------------------------------
5671 function Is_Constrained_Packed_Array
(Typ
: Entity_Id
) return Boolean is
5672 Arr
: Entity_Id
:= Typ
;
5675 if Is_Access_Type
(Arr
) then
5676 Arr
:= Designated_Type
(Arr
);
5679 return Is_Array_Type
(Arr
)
5680 and then Is_Constrained
(Arr
)
5681 and then Present
(Packed_Array_Type
(Arr
));
5682 end Is_Constrained_Packed_Array
;
5684 ----------------------------------------
5685 -- Is_Inline_Floating_Point_Attribute --
5686 ----------------------------------------
5688 function Is_Inline_Floating_Point_Attribute
(N
: Node_Id
) return Boolean is
5689 Id
: constant Attribute_Id
:= Get_Attribute_Id
(Attribute_Name
(N
));
5692 if Nkind
(Parent
(N
)) /= N_Type_Conversion
5693 or else not Is_Integer_Type
(Etype
(Parent
(N
)))
5698 -- Should also support 'Machine_Rounding and 'Unbiased_Rounding, but
5699 -- required back end support has not been implemented yet ???
5701 return Id
= Attribute_Truncation
;
5702 end Is_Inline_Floating_Point_Attribute
;