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);
239 E_T : constant Entity_Id := Equivalent_Type (Btyp);
240 Acc : constant Entity_Id :=
241 Etype (Next_Component (First_Component (E_T)));
245 function May_Be_External_Call return Boolean;
246 -- If the 'Access is to a local operation, but appears in a context
247 -- where it may lead to a call from outside the object, we must treat
248 -- this as an external call. Clearly we cannot tell without full
249 -- flow analysis, and a subsequent call that uses this 'Access may
250 -- lead to a bounded error (trying to seize locks twice, e.g.). For
251 -- now we treat 'Access as a potential external call if it is an actual
252 -- in a call to an outside subprogram.
254 --------------------------
255 -- May_Be_External_Call --
256 --------------------------
258 function May_Be_External_Call return Boolean is
260 Par : Node_Id := Parent (N);
263 -- Account for the case where the Access attribute is part of a
264 -- named parameter association.
266 if Nkind (Par) = N_Parameter_Association then
270 if Nkind_In (Par, N_Procedure_Call_Statement, N_Function_Call)
271 and then Is_Entity_Name (Name (Par))
273 Subp := Entity (Name (Par));
274 return not In_Open_Scopes (Scope (Subp));
278 end May_Be_External_Call;
280 -- Start of processing for Expand_Access_To_Protected_Op
283 -- Within the body of the protected type, the prefix
284 -- designates a local operation, and the object is the first
285 -- parameter of the corresponding protected body of the
286 -- current enclosing operation.
288 if Is_Entity_Name (Pref) then
289 if May_Be_External_Call then
292 (External_Subprogram (Entity (Pref)), Loc);
296 (Protected_Body_Subprogram (Entity (Pref)), Loc);
299 -- Don't traverse the scopes when the attribute occurs within an init
300 -- proc, because we directly use the _init formal of the init proc in
303 Curr := Current_Scope;
304 if not Is_Init_Proc (Curr) then
305 pragma Assert (In_Open_Scopes (Scope (Entity (Pref))));
307 while Scope (Curr) /= Scope (Entity (Pref)) loop
308 Curr := Scope (Curr);
312 -- In case of protected entries the first formal of its Protected_
313 -- Body_Subprogram is the address of the object.
315 if Ekind (Curr) = E_Entry then
319 (Protected_Body_Subprogram (Curr)), Loc);
321 -- If the current scope is an init proc, then use the address of the
322 -- _init formal as the object reference.
324 elsif Is_Init_Proc (Curr) then
326 Make_Attribute_Reference (Loc,
327 Prefix => New_Occurrence_Of (First_Formal (Curr), Loc),
328 Attribute_Name => Name_Address);
330 -- In case of protected subprograms the first formal of its
331 -- Protected_Body_Subprogram is the object and we get its address.
335 Make_Attribute_Reference (Loc,
339 (Protected_Body_Subprogram (Curr)), Loc),
340 Attribute_Name => Name_Address);
343 -- Case where the prefix is not an entity name. Find the
344 -- version of the protected operation to be called from
345 -- outside the protected object.
351 (Entity (Selector_Name (Pref))), Loc);
354 Make_Attribute_Reference (Loc,
355 Prefix => Relocate_Node (Prefix (Pref)),
356 Attribute_Name => Name_Address);
360 Make_Attribute_Reference (Loc,
362 Attribute_Name => Name_Access);
364 -- We set the type of the access reference to the already generated
365 -- access_to_subprogram type, and declare the reference analyzed, to
366 -- prevent further expansion when the enclosing aggregate is analyzed.
368 Set_Etype (Sub_Ref, Acc);
369 Set_Analyzed (Sub_Ref);
379 Analyze_And_Resolve (N, E_T);
381 -- For subsequent analysis, the node must retain its type.
382 -- The backend will replace it with the equivalent type where
386 end Expand_Access_To_Protected_Op;
388 --------------------------
389 -- Expand_Fpt_Attribute --
390 --------------------------
392 procedure Expand_Fpt_Attribute
398 Loc : constant Source_Ptr := Sloc (N);
399 Typ : constant Entity_Id := Etype (N);
403 -- The function name is the selected component Attr_xxx.yyy where
404 -- Attr_xxx is the package name, and yyy is the argument Nam.
406 -- Note: it would be more usual to have separate RE entries for each
407 -- of the entities in the Fat packages, but first they have identical
408 -- names (so we would have to have lots of renaming declarations to
409 -- meet the normal RE rule of separate names for all runtime entities),
410 -- and second there would be an awful lot of them!
413 Make_Selected_Component (Loc,
414 Prefix => New_Reference_To (RTE (Pkg), Loc),
415 Selector_Name => Make_Identifier (Loc, Nam));
417 -- The generated call is given the provided set of parameters, and then
418 -- wrapped in a conversion which converts the result to the target type
419 -- We use the base type as the target because a range check may be
423 Unchecked_Convert_To (Base_Type (Etype (N)),
424 Make_Function_Call (Loc,
426 Parameter_Associations => Args)));
428 Analyze_And_Resolve (N, Typ);
429 end Expand_Fpt_Attribute;
431 ----------------------------
432 -- Expand_Fpt_Attribute_R --
433 ----------------------------
435 -- The single argument is converted to its root type to call the
436 -- appropriate runtime function, with the actual call being built
437 -- by Expand_Fpt_Attribute
439 procedure Expand_Fpt_Attribute_R (N : Node_Id) is
440 E1 : constant Node_Id := First (Expressions (N));
444 Find_Fat_Info (Etype (E1), Ftp, Pkg);
446 (N, Pkg, Attribute_Name (N),
447 New_List (Unchecked_Convert_To (Ftp, Relocate_Node (E1))));
448 end Expand_Fpt_Attribute_R;
450 -----------------------------
451 -- Expand_Fpt_Attribute_RI --
452 -----------------------------
454 -- The first argument is converted to its root type and the second
455 -- argument is converted to standard long long integer to call the
456 -- appropriate runtime function, with the actual call being built
457 -- by Expand_Fpt_Attribute
459 procedure Expand_Fpt_Attribute_RI (N : Node_Id) is
460 E1 : constant Node_Id := First (Expressions (N));
463 E2 : constant Node_Id := Next (E1);
465 Find_Fat_Info (Etype (E1), Ftp, Pkg);
467 (N, Pkg, Attribute_Name (N),
469 Unchecked_Convert_To (Ftp, Relocate_Node (E1)),
470 Unchecked_Convert_To (Standard_Integer, Relocate_Node (E2))));
471 end Expand_Fpt_Attribute_RI;
473 -----------------------------
474 -- Expand_Fpt_Attribute_RR --
475 -----------------------------
477 -- The two arguments are converted to their root types to call the
478 -- appropriate runtime function, with the actual call being built
479 -- by Expand_Fpt_Attribute
481 procedure Expand_Fpt_Attribute_RR (N : Node_Id) is
482 E1 : constant Node_Id := First (Expressions (N));
485 E2 : constant Node_Id := Next (E1);
487 Find_Fat_Info (Etype (E1), Ftp, Pkg);
489 (N, Pkg, Attribute_Name (N),
491 Unchecked_Convert_To (Ftp, Relocate_Node (E1)),
492 Unchecked_Convert_To (Ftp, Relocate_Node (E2))));
493 end Expand_Fpt_Attribute_RR;
495 ----------------------------------
496 -- Expand_N_Attribute_Reference --
497 ----------------------------------
499 procedure Expand_N_Attribute_Reference (N : Node_Id) is
500 Loc : constant Source_Ptr := Sloc (N);
501 Typ : constant Entity_Id := Etype (N);
502 Btyp : constant Entity_Id := Base_Type (Typ);
503 Pref : constant Node_Id := Prefix (N);
504 Ptyp : constant Entity_Id := Etype (Pref);
505 Exprs : constant List_Id := Expressions (N);
506 Id : constant Attribute_Id := Get_Attribute_Id (Attribute_Name (N));
508 procedure Rewrite_Stream_Proc_Call (Pname : Entity_Id);
509 -- Rewrites a stream attribute for Read, Write or Output with the
510 -- procedure call. Pname is the entity for the procedure to call.
512 ------------------------------
513 -- Rewrite_Stream_Proc_Call --
514 ------------------------------
516 procedure Rewrite_Stream_Proc_Call (Pname : Entity_Id) is
517 Item : constant Node_Id := Next (First (Exprs));
518 Formal : constant Entity_Id := Next_Formal (First_Formal (Pname));
519 Formal_Typ : constant Entity_Id := Etype (Formal);
520 Is_Written : constant Boolean := (Ekind (Formal) /= E_In_Parameter);
523 -- The expansion depends on Item, the second actual, which is
524 -- the object being streamed in or out.
526 -- If the item is a component of a packed array type, and
527 -- a conversion is needed on exit, we introduce a temporary to
528 -- hold the value, because otherwise the packed reference will
529 -- not be properly expanded.
531 if Nkind (Item) = N_Indexed_Component
532 and then Is_Packed (Base_Type (Etype (Prefix (Item))))
533 and then Base_Type (Etype (Item)) /= Base_Type (Formal_Typ)
537 Temp : constant Entity_Id :=
538 Make_Defining_Identifier
539 (Loc, New_Internal_Name ('V'));
545 Make_Object_Declaration (Loc,
546 Defining_Identifier => Temp,
548 New_Occurrence_Of (Formal_Typ, Loc));
549 Set_Etype (Temp, Formal_Typ);
552 Make_Assignment_Statement (Loc,
553 Name => New_Copy_Tree (Item),
556 (Etype (Item), New_Occurrence_Of (Temp, Loc)));
558 Rewrite (Item, New_Occurrence_Of (Temp, Loc));
562 Make_Procedure_Call_Statement (Loc,
563 Name => New_Occurrence_Of (Pname, Loc),
564 Parameter_Associations => Exprs),
567 Rewrite (N, Make_Null_Statement (Loc));
572 -- For the class-wide dispatching cases, and for cases in which
573 -- the base type of the second argument matches the base type of
574 -- the corresponding formal parameter (that is to say the stream
575 -- operation is not inherited), we are all set, and can use the
576 -- argument unchanged.
578 -- For all other cases we do an unchecked conversion of the second
579 -- parameter to the type of the formal of the procedure we are
580 -- calling. This deals with the private type cases, and with going
581 -- to the root type as required in elementary type case.
583 if not Is_Class_Wide_Type (Entity (Pref))
584 and then not Is_Class_Wide_Type (Etype (Item))
585 and then Base_Type (Etype (Item)) /= Base_Type (Formal_Typ)
588 Unchecked_Convert_To (Formal_Typ, Relocate_Node (Item)));
590 -- For untagged derived types set Assignment_OK, to prevent
591 -- copies from being created when the unchecked conversion
592 -- is expanded (which would happen in Remove_Side_Effects
593 -- if Expand_N_Unchecked_Conversion were allowed to call
594 -- Force_Evaluation). The copy could violate Ada semantics
595 -- in cases such as an actual that is an out parameter.
596 -- Note that this approach is also used in exp_ch7 for calls
597 -- to controlled type operations to prevent problems with
598 -- actuals wrapped in unchecked conversions.
600 if Is_Untagged_Derivation (Etype (Expression (Item))) then
601 Set_Assignment_OK (Item);
605 -- The stream operation to call maybe a renaming created by
606 -- an attribute definition clause, and may not be frozen yet.
607 -- Ensure that it has the necessary extra formals.
609 if not Is_Frozen (Pname) then
610 Create_Extra_Formals (Pname);
613 -- And now rewrite the call
616 Make_Procedure_Call_Statement (Loc,
617 Name => New_Occurrence_Of (Pname, Loc),
618 Parameter_Associations => Exprs));
621 end Rewrite_Stream_Proc_Call;
623 -- Start of processing for Expand_N_Attribute_Reference
626 -- Do required validity checking, if enabled. Do not apply check to
627 -- output parameters of an Asm instruction, since the value of this
628 -- is not set till after the attribute has been elaborated, and do
629 -- not apply the check to the arguments of a 'Read or 'Input attribute
630 -- reference since the scalar argument is an OUT scalar.
632 if Validity_Checks_On and then Validity_Check_Operands
633 and then Id /= Attribute_Asm_Output
634 and then Id /= Attribute_Read
635 and then Id /= Attribute_Input
640 Expr := First (Expressions (N));
641 while Present (Expr) loop
648 -- Ada 2005 (AI-318-02): If attribute prefix is a call to a build-in-
649 -- place function, then a temporary return object needs to be created
650 -- and access to it must be passed to the function. Currently we limit
651 -- such functions to those with inherently limited result subtypes, but
652 -- eventually we plan to expand the functions that are treated as
653 -- build-in-place to include other composite result types.
655 if Ada_Version >= Ada_05
656 and then Is_Build_In_Place_Function_Call (Pref)
658 Make_Build_In_Place_Call_In_Anonymous_Context (Pref);
661 -- If prefix is a protected type name, this is a reference to
662 -- the current instance of the type.
664 if Is_Protected_Self_Reference (Pref) then
665 Rewrite (Pref, Concurrent_Ref (Pref));
669 -- Remaining processing depends on specific attribute
677 when Attribute_Access |
678 Attribute_Unchecked_Access |
679 Attribute_Unrestricted_Access =>
681 Access_Cases : declare
682 Ref_Object : constant Node_Id := Get_Referenced_Object (Pref);
683 Btyp_DDT : Entity_Id;
685 function Enclosing_Object (N : Node_Id) return Node_Id;
686 -- If N denotes a compound name (selected component, indexed
687 -- component, or slice), returns the name of the outermost
688 -- such enclosing object. Otherwise returns N. If the object
689 -- is a renaming, then the renamed object is returned.
691 ----------------------
692 -- Enclosing_Object --
693 ----------------------
695 function Enclosing_Object (N : Node_Id) return Node_Id is
700 while Nkind_In (Obj_Name, N_Selected_Component,
704 Obj_Name := Prefix (Obj_Name);
707 return Get_Referenced_Object (Obj_Name);
708 end Enclosing_Object;
710 -- Local declarations
712 Enc_Object : constant Node_Id := Enclosing_Object (Ref_Object);
714 -- Start of processing for Access_Cases
717 Btyp_DDT := Designated_Type (Btyp);
719 -- Handle designated types that come from the limited view
721 if Ekind (Btyp_DDT) = E_Incomplete_Type
722 and then From_With_Type (Btyp_DDT)
723 and then Present (Non_Limited_View (Btyp_DDT))
725 Btyp_DDT := Non_Limited_View (Btyp_DDT);
727 elsif Is_Class_Wide_Type (Btyp_DDT)
728 and then Ekind (Etype (Btyp_DDT)) = E_Incomplete_Type
729 and then From_With_Type (Etype (Btyp_DDT))
730 and then Present (Non_Limited_View (Etype (Btyp_DDT)))
731 and then Present (Class_Wide_Type
732 (Non_Limited_View (Etype (Btyp_DDT))))
735 Class_Wide_Type (Non_Limited_View (Etype (Btyp_DDT)));
738 -- In order to improve the text of error messages, the designated
739 -- type of access-to-subprogram itypes is set by the semantics as
740 -- the associated subprogram entity (see sem_attr). Now we replace
741 -- such node with the proper E_Subprogram_Type itype.
743 if Id = Attribute_Unrestricted_Access
744 and then Is_Subprogram (Directly_Designated_Type (Typ))
746 -- The following conditions ensure that this special management
747 -- is done only for "Address!(Prim'Unrestricted_Access)" nodes.
748 -- At this stage other cases in which the designated type is
749 -- still a subprogram (instead of an E_Subprogram_Type) are
750 -- wrong because the semantics must have overridden the type of
751 -- the node with the type imposed by the context.
753 if Nkind (Parent (N)) = N_Unchecked_Type_Conversion
754 and then Etype (Parent (N)) = RTE (RE_Prim_Ptr)
756 Set_Etype (N, RTE (RE_Prim_Ptr));
760 Subp : constant Entity_Id :=
761 Directly_Designated_Type (Typ);
763 Extra : Entity_Id := Empty;
764 New_Formal : Entity_Id;
765 Old_Formal : Entity_Id := First_Formal (Subp);
766 Subp_Typ : Entity_Id;
769 Subp_Typ := Create_Itype (E_Subprogram_Type, N);
770 Set_Etype (Subp_Typ, Etype (Subp));
771 Set_Returns_By_Ref (Subp_Typ, Returns_By_Ref (Subp));
773 if Present (Old_Formal) then
774 New_Formal := New_Copy (Old_Formal);
775 Set_First_Entity (Subp_Typ, New_Formal);
778 Set_Scope (New_Formal, Subp_Typ);
779 Etyp := Etype (New_Formal);
781 -- Handle itypes. There is no need to duplicate
782 -- here the itypes associated with record types
783 -- (i.e the implicit full view of private types).
786 and then Ekind (Base_Type (Etyp)) /= E_Record_Type
788 Extra := New_Copy (Etyp);
789 Set_Parent (Extra, New_Formal);
790 Set_Etype (New_Formal, Extra);
791 Set_Scope (Extra, Subp_Typ);
795 Next_Formal (Old_Formal);
796 exit when No (Old_Formal);
798 Set_Next_Entity (New_Formal,
799 New_Copy (Old_Formal));
800 Next_Entity (New_Formal);
803 Set_Next_Entity (New_Formal, Empty);
804 Set_Last_Entity (Subp_Typ, Extra);
807 -- Now that the explicit formals have been duplicated,
808 -- any extra formals needed by the subprogram must be
811 if Present (Extra) then
812 Set_Extra_Formal (Extra, Empty);
815 Create_Extra_Formals (Subp_Typ);
816 Set_Directly_Designated_Type (Typ, Subp_Typ);
821 if Is_Access_Protected_Subprogram_Type (Btyp) then
822 Expand_Access_To_Protected_Op (N, Pref, Typ);
824 -- If prefix is a type name, this is a reference to the current
825 -- instance of the type, within its initialization procedure.
827 elsif Is_Entity_Name (Pref)
828 and then Is_Type (Entity (Pref))
835 -- If the current instance name denotes a task type, then
836 -- the access attribute is rewritten to be the name of the
837 -- "_task" parameter associated with the task type's task
838 -- procedure. An unchecked conversion is applied to ensure
839 -- a type match in cases of expander-generated calls (e.g.
842 if Is_Task_Type (Entity (Pref)) then
844 First_Entity (Get_Task_Body_Procedure (Entity (Pref)));
845 while Present (Formal) loop
846 exit when Chars (Formal) = Name_uTask;
847 Next_Entity (Formal);
850 pragma Assert (Present (Formal));
853 Unchecked_Convert_To (Typ,
854 New_Occurrence_Of (Formal, Loc)));
857 -- The expression must appear in a default expression,
858 -- (which in the initialization procedure is the
859 -- right-hand side of an assignment), and not in a
860 -- discriminant constraint.
864 while Present (Par) loop
865 exit when Nkind (Par) = N_Assignment_Statement;
867 if Nkind (Par) = N_Component_Declaration then
874 if Present (Par) then
876 Make_Attribute_Reference (Loc,
877 Prefix => Make_Identifier (Loc, Name_uInit),
878 Attribute_Name => Attribute_Name (N)));
880 Analyze_And_Resolve (N, Typ);
885 -- If the prefix of an Access attribute is a dereference of an
886 -- access parameter (or a renaming of such a dereference, or a
887 -- subcomponent of such a dereference) and the context is a
888 -- general access type (including the type of an object or
889 -- component with an access_definition, but not the anonymous
890 -- type of an access parameter or access discriminant), then
891 -- apply an accessibility check to the access parameter. We used
892 -- to rewrite the access parameter as a type conversion, but that
893 -- could only be done if the immediate prefix of the Access
894 -- attribute was the dereference, and didn't handle cases where
895 -- the attribute is applied to a subcomponent of the dereference,
896 -- since there's generally no available, appropriate access type
897 -- to convert to in that case. The attribute is passed as the
898 -- point to insert the check, because the access parameter may
899 -- come from a renaming, possibly in a different scope, and the
900 -- check must be associated with the attribute itself.
902 elsif Id = Attribute_Access
903 and then Nkind (Enc_Object) = N_Explicit_Dereference
904 and then Is_Entity_Name (Prefix (Enc_Object))
905 and then (Ekind (Btyp) = E_General_Access_Type
906 or else Is_Local_Anonymous_Access (Btyp))
907 and then Ekind (Entity (Prefix (Enc_Object))) in Formal_Kind
908 and then Ekind (Etype (Entity (Prefix (Enc_Object))))
909 = E_Anonymous_Access_Type
910 and then Present (Extra_Accessibility
911 (Entity (Prefix (Enc_Object))))
913 Apply_Accessibility_Check (Prefix (Enc_Object), Typ, N);
915 -- Ada 2005 (AI-251): If the designated type is an interface we
916 -- add an implicit conversion to force the displacement of the
917 -- pointer to reference the secondary dispatch table.
919 elsif Is_Interface (Btyp_DDT)
920 and then (Comes_From_Source (N)
921 or else Comes_From_Source (Ref_Object)
922 or else (Nkind (Ref_Object) in N_Has_Chars
923 and then Chars (Ref_Object) = Name_uInit))
925 if Nkind (Ref_Object) /= N_Explicit_Dereference then
927 -- No implicit conversion required if types match, or if
928 -- the prefix is the class_wide_type of the interface. In
929 -- either case passing an object of the interface type has
930 -- already set the pointer correctly.
932 if Btyp_DDT = Etype (Ref_Object)
933 or else (Is_Class_Wide_Type (Etype (Ref_Object))
935 Class_Wide_Type (Btyp_DDT) = Etype (Ref_Object))
941 Convert_To (Btyp_DDT,
942 New_Copy_Tree (Prefix (N))));
944 Analyze_And_Resolve (Prefix (N), Btyp_DDT);
947 -- When the object is an explicit dereference, convert the
948 -- dereference's prefix.
952 Obj_DDT : constant Entity_Id :=
954 (Directly_Designated_Type
955 (Etype (Prefix (Ref_Object))));
957 -- No implicit conversion required if designated types
960 if Obj_DDT /= Btyp_DDT
961 and then not (Is_Class_Wide_Type (Obj_DDT)
962 and then Etype (Obj_DDT) = Btyp_DDT)
966 New_Copy_Tree (Prefix (Ref_Object))));
967 Analyze_And_Resolve (N, Typ);
978 -- Transforms 'Adjacent into a call to the floating-point attribute
979 -- function Adjacent in Fat_xxx (where xxx is the root type)
981 when Attribute_Adjacent =>
982 Expand_Fpt_Attribute_RR (N);
988 when Attribute_Address => Address : declare
989 Task_Proc : Entity_Id;
992 -- If the prefix is a task or a task type, the useful address is that
993 -- of the procedure for the task body, i.e. the actual program unit.
994 -- We replace the original entity with that of the procedure.
996 if Is_Entity_Name (Pref)
997 and then Is_Task_Type (Entity (Pref))
999 Task_Proc := Next_Entity (Root_Type (Ptyp));
1001 while Present (Task_Proc) loop
1002 exit when Ekind (Task_Proc) = E_Procedure
1003 and then Etype (First_Formal (Task_Proc)) =
1004 Corresponding_Record_Type (Ptyp);
1005 Next_Entity (Task_Proc);
1008 if Present (Task_Proc) then
1009 Set_Entity (Pref, Task_Proc);
1010 Set_Etype (Pref, Etype (Task_Proc));
1013 -- Similarly, the address of a protected operation is the address
1014 -- of the corresponding protected body, regardless of the protected
1015 -- object from which it is selected.
1017 elsif Nkind (Pref) = N_Selected_Component
1018 and then Is_Subprogram (Entity (Selector_Name (Pref)))
1019 and then Is_Protected_Type (Scope (Entity (Selector_Name (Pref))))
1023 External_Subprogram (Entity (Selector_Name (Pref))), Loc));
1025 elsif Nkind (Pref) = N_Explicit_Dereference
1026 and then Ekind (Ptyp) = E_Subprogram_Type
1027 and then Convention (Ptyp) = Convention_Protected
1029 -- The prefix is be a dereference of an access_to_protected_
1030 -- subprogram. The desired address is the second component of
1031 -- the record that represents the access.
1034 Addr : constant Entity_Id := Etype (N);
1035 Ptr : constant Node_Id := Prefix (Pref);
1036 T : constant Entity_Id :=
1037 Equivalent_Type (Base_Type (Etype (Ptr)));
1041 Unchecked_Convert_To (Addr,
1042 Make_Selected_Component (Loc,
1043 Prefix => Unchecked_Convert_To (T, Ptr),
1044 Selector_Name => New_Occurrence_Of (
1045 Next_Entity (First_Entity (T)), Loc))));
1047 Analyze_And_Resolve (N, Addr);
1050 -- Ada 2005 (AI-251): Class-wide interface objects are always
1051 -- "displaced" to reference the tag associated with the interface
1052 -- type. In order to obtain the real address of such objects we
1053 -- generate a call to a run-time subprogram that returns the base
1054 -- address of the object.
1056 -- This processing is not needed in the VM case, where dispatching
1057 -- issues are taken care of by the virtual machine.
1059 elsif Is_Class_Wide_Type (Ptyp)
1060 and then Is_Interface (Ptyp)
1061 and then Tagged_Type_Expansion
1062 and then not (Nkind (Pref) in N_Has_Entity
1063 and then Is_Subprogram (Entity (Pref)))
1066 Make_Function_Call (Loc,
1067 Name => New_Reference_To (RTE (RE_Base_Address), Loc),
1068 Parameter_Associations => New_List (
1069 Relocate_Node (N))));
1074 -- Deal with packed array reference, other cases are handled by
1077 if Involves_Packed_Array_Reference (Pref) then
1078 Expand_Packed_Address_Reference (N);
1086 when Attribute_Alignment => Alignment : declare
1090 -- For class-wide types, X'Class'Alignment is transformed into a
1091 -- direct reference to the Alignment of the class type, so that the
1092 -- back end does not have to deal with the X'Class'Alignment
1095 if Is_Entity_Name (Pref)
1096 and then Is_Class_Wide_Type (Entity (Pref))
1098 Rewrite (Prefix (N), New_Occurrence_Of (Entity (Pref), Loc));
1101 -- For x'Alignment applied to an object of a class wide type,
1102 -- transform X'Alignment into a call to the predefined primitive
1103 -- operation _Alignment applied to X.
1105 elsif Is_Class_Wide_Type (Ptyp) then
1107 -- No need to do anything else compiling under restriction
1108 -- No_Dispatching_Calls. During the semantic analysis we
1109 -- already notified such violation.
1111 if Restriction_Active (No_Dispatching_Calls) then
1116 Make_Function_Call (Loc,
1117 Name => New_Reference_To
1118 (Find_Prim_Op (Ptyp, Name_uAlignment), Loc),
1119 Parameter_Associations => New_List (Pref));
1121 if Typ /= Standard_Integer then
1123 -- The context is a specific integer type with which the
1124 -- original attribute was compatible. The function has a
1125 -- specific type as well, so to preserve the compatibility
1126 -- we must convert explicitly.
1128 New_Node := Convert_To (Typ, New_Node);
1131 Rewrite (N, New_Node);
1132 Analyze_And_Resolve (N, Typ);
1135 -- For all other cases, we just have to deal with the case of
1136 -- the fact that the result can be universal.
1139 Apply_Universal_Integer_Attribute_Checks (N);
1147 when Attribute_AST_Entry => AST_Entry : declare
1152 Entry_Ref : Node_Id;
1153 -- The reference to the entry or entry family
1156 -- The index expression for an entry family reference, or
1157 -- the Empty if Entry_Ref references a simple entry.
1160 if Nkind (Pref) = N_Indexed_Component then
1161 Entry_Ref := Prefix (Pref);
1162 Index := First (Expressions (Pref));
1168 -- Get expression for Task_Id and the entry entity
1170 if Nkind (Entry_Ref) = N_Selected_Component then
1172 Make_Attribute_Reference (Loc,
1173 Attribute_Name => Name_Identity,
1174 Prefix => Prefix (Entry_Ref));
1176 Ttyp := Etype (Prefix (Entry_Ref));
1177 Eent := Entity (Selector_Name (Entry_Ref));
1181 Make_Function_Call (Loc,
1182 Name => New_Occurrence_Of (RTE (RE_Current_Task), Loc));
1184 Eent := Entity (Entry_Ref);
1186 -- We have to find the enclosing task to get the task type
1187 -- There must be one, since we already validated this earlier
1189 Ttyp := Current_Scope;
1190 while not Is_Task_Type (Ttyp) loop
1191 Ttyp := Scope (Ttyp);
1195 -- Now rewrite the attribute with a call to Create_AST_Handler
1198 Make_Function_Call (Loc,
1199 Name => New_Occurrence_Of (RTE (RE_Create_AST_Handler), Loc),
1200 Parameter_Associations => New_List (
1202 Entry_Index_Expression (Loc, Eent, Index, Ttyp))));
1204 Analyze_And_Resolve (N, RTE (RE_AST_Handler));
1211 -- We compute this if a component clause was present, otherwise we leave
1212 -- the computation up to the back end, since we don't know what layout
1215 -- Note that the attribute can apply to a naked record component
1216 -- in generated code (i.e. the prefix is an identifier that
1217 -- references the component or discriminant entity).
1219 when Attribute_Bit_Position => Bit_Position :
1224 if Nkind (Pref) = N_Identifier then
1225 CE := Entity (Pref);
1227 CE := Entity (Selector_Name (Pref));
1230 if Known_Static_Component_Bit_Offset (CE) then
1232 Make_Integer_Literal (Loc,
1233 Intval => Component_Bit_Offset (CE)));
1234 Analyze_And_Resolve (N, Typ);
1237 Apply_Universal_Integer_Attribute_Checks (N);
1245 -- A reference to P'Body_Version or P'Version is expanded to
1248 -- pragma Import (C, Vnn, "uuuuT");
1250 -- Get_Version_String (Vnn)
1252 -- where uuuu is the unit name (dots replaced by double underscore)
1253 -- and T is B for the cases of Body_Version, or Version applied to a
1254 -- subprogram acting as its own spec, and S for Version applied to a
1255 -- subprogram spec or package. This sequence of code references the
1256 -- the unsigned constant created in the main program by the binder.
1258 -- A special exception occurs for Standard, where the string
1259 -- returned is a copy of the library string in gnatvsn.ads.
1261 when Attribute_Body_Version | Attribute_Version => Version : declare
1262 E : constant Entity_Id :=
1263 Make_Defining_Identifier (Loc, New_Internal_Name ('V'));
1268 -- If not library unit, get to containing library unit
1270 Pent := Entity (Pref);
1271 while Pent /= Standard_Standard
1272 and then Scope (Pent) /= Standard_Standard
1273 and then not Is_Child_Unit (Pent)
1275 Pent := Scope (Pent);
1278 -- Special case Standard and Standard.ASCII
1280 if Pent = Standard_Standard or else Pent = Standard_ASCII then
1282 Make_String_Literal (Loc,
1283 Strval => Verbose_Library_Version));
1288 -- Build required string constant
1290 Get_Name_String (Get_Unit_Name (Pent));
1293 for J in 1 .. Name_Len - 2 loop
1294 if Name_Buffer (J) = '.' then
1295 Store_String_Chars ("__");
1297 Store_String_Char (Get_Char_Code (Name_Buffer (J)));
1301 -- Case of subprogram acting as its own spec, always use body
1303 if Nkind (Declaration_Node (Pent)) in N_Subprogram_Specification
1304 and then Nkind (Parent (Declaration_Node (Pent))) =
1306 and then Acts_As_Spec (Parent (Declaration_Node (Pent)))
1308 Store_String_Chars ("B");
1310 -- Case of no body present, always use spec
1312 elsif not Unit_Requires_Body (Pent) then
1313 Store_String_Chars ("S");
1315 -- Otherwise use B for Body_Version, S for spec
1317 elsif Id = Attribute_Body_Version then
1318 Store_String_Chars ("B");
1320 Store_String_Chars ("S");
1324 Lib.Version_Referenced (S);
1326 -- Insert the object declaration
1328 Insert_Actions (N, New_List (
1329 Make_Object_Declaration (Loc,
1330 Defining_Identifier => E,
1331 Object_Definition =>
1332 New_Occurrence_Of (RTE (RE_Unsigned), Loc))));
1334 -- Set entity as imported with correct external name
1336 Set_Is_Imported (E);
1337 Set_Interface_Name (E, Make_String_Literal (Loc, S));
1339 -- Set entity as internal to ensure proper Sprint output of its
1340 -- implicit importation.
1342 Set_Is_Internal (E);
1344 -- And now rewrite original reference
1347 Make_Function_Call (Loc,
1348 Name => New_Reference_To (RTE (RE_Get_Version_String), Loc),
1349 Parameter_Associations => New_List (
1350 New_Occurrence_Of (E, Loc))));
1353 Analyze_And_Resolve (N, RTE (RE_Version_String));
1360 -- Transforms 'Ceiling into a call to the floating-point attribute
1361 -- function Ceiling in Fat_xxx (where xxx is the root type)
1363 when Attribute_Ceiling =>
1364 Expand_Fpt_Attribute_R (N);
1370 -- Transforms 'Callable attribute into a call to the Callable function
1372 when Attribute_Callable => Callable :
1374 -- We have an object of a task interface class-wide type as a prefix
1375 -- to Callable. Generate:
1376 -- callable (Task_Id (Pref._disp_get_task_id));
1378 if Ada_Version >= Ada_05
1379 and then Ekind (Ptyp) = E_Class_Wide_Type
1380 and then Is_Interface (Ptyp)
1381 and then Is_Task_Interface (Ptyp)
1384 Make_Function_Call (Loc,
1386 New_Reference_To (RTE (RE_Callable), Loc),
1387 Parameter_Associations => New_List (
1388 Make_Unchecked_Type_Conversion (Loc,
1390 New_Reference_To (RTE (RO_ST_Task_Id), Loc),
1392 Make_Selected_Component (Loc,
1394 New_Copy_Tree (Pref),
1396 Make_Identifier (Loc, Name_uDisp_Get_Task_Id))))));
1400 Build_Call_With_Task (Pref, RTE (RE_Callable)));
1403 Analyze_And_Resolve (N, Standard_Boolean);
1410 -- Transforms 'Caller attribute into a call to either the
1411 -- Task_Entry_Caller or the Protected_Entry_Caller function.
1413 when Attribute_Caller => Caller : declare
1414 Id_Kind : constant Entity_Id := RTE (RO_AT_Task_Id);
1415 Ent : constant Entity_Id := Entity (Pref);
1416 Conctype : constant Entity_Id := Scope (Ent);
1417 Nest_Depth : Integer := 0;
1424 if Is_Protected_Type (Conctype) then
1425 case Corresponding_Runtime_Package (Conctype) is
1426 when System_Tasking_Protected_Objects_Entries =>
1429 (RTE (RE_Protected_Entry_Caller), Loc);
1431 when System_Tasking_Protected_Objects_Single_Entry =>
1434 (RTE (RE_Protected_Single_Entry_Caller), Loc);
1437 raise Program_Error;
1441 Unchecked_Convert_To (Id_Kind,
1442 Make_Function_Call (Loc,
1444 Parameter_Associations => New_List (
1446 (Find_Protection_Object (Current_Scope), Loc)))));
1451 -- Determine the nesting depth of the E'Caller attribute, that
1452 -- is, how many accept statements are nested within the accept
1453 -- statement for E at the point of E'Caller. The runtime uses
1454 -- this depth to find the specified entry call.
1456 for J in reverse 0 .. Scope_Stack.Last loop
1457 S := Scope_Stack.Table (J).Entity;
1459 -- We should not reach the scope of the entry, as it should
1460 -- already have been checked in Sem_Attr that this attribute
1461 -- reference is within a matching accept statement.
1463 pragma Assert (S /= Conctype);
1468 elsif Is_Entry (S) then
1469 Nest_Depth := Nest_Depth + 1;
1474 Unchecked_Convert_To (Id_Kind,
1475 Make_Function_Call (Loc,
1477 New_Reference_To (RTE (RE_Task_Entry_Caller), Loc),
1478 Parameter_Associations => New_List (
1479 Make_Integer_Literal (Loc,
1480 Intval => Int (Nest_Depth))))));
1483 Analyze_And_Resolve (N, Id_Kind);
1490 -- Transforms 'Compose into a call to the floating-point attribute
1491 -- function Compose in Fat_xxx (where xxx is the root type)
1493 -- Note: we strictly should have special code here to deal with the
1494 -- case of absurdly negative arguments (less than Integer'First)
1495 -- which will return a (signed) zero value, but it hardly seems
1496 -- worth the effort. Absurdly large positive arguments will raise
1497 -- constraint error which is fine.
1499 when Attribute_Compose =>
1500 Expand_Fpt_Attribute_RI (N);
1506 when Attribute_Constrained => Constrained : declare
1507 Formal_Ent : constant Entity_Id := Param_Entity (Pref);
1509 function Is_Constrained_Aliased_View (Obj : Node_Id) return Boolean;
1510 -- Ada 2005 (AI-363): Returns True if the object name Obj denotes a
1511 -- view of an aliased object whose subtype is constrained.
1513 ---------------------------------
1514 -- Is_Constrained_Aliased_View --
1515 ---------------------------------
1517 function Is_Constrained_Aliased_View (Obj : Node_Id) return Boolean is
1521 if Is_Entity_Name (Obj) then
1524 if Present (Renamed_Object (E)) then
1525 return Is_Constrained_Aliased_View (Renamed_Object (E));
1527 return Is_Aliased (E) and then Is_Constrained (Etype (E));
1531 return Is_Aliased_View (Obj)
1533 (Is_Constrained (Etype (Obj))
1534 or else (Nkind (Obj) = N_Explicit_Dereference
1536 not Has_Constrained_Partial_View
1537 (Base_Type (Etype (Obj)))));
1539 end Is_Constrained_Aliased_View;
1541 -- Start of processing for Constrained
1544 -- Reference to a parameter where the value is passed as an extra
1545 -- actual, corresponding to the extra formal referenced by the
1546 -- Extra_Constrained field of the corresponding formal. If this
1547 -- is an entry in-parameter, it is replaced by a constant renaming
1548 -- for which Extra_Constrained is never created.
1550 if Present (Formal_Ent)
1551 and then Ekind (Formal_Ent) /= E_Constant
1552 and then Present (Extra_Constrained (Formal_Ent))
1556 (Extra_Constrained (Formal_Ent), Sloc (N)));
1558 -- For variables with a Extra_Constrained field, we use the
1559 -- corresponding entity.
1561 elsif Nkind (Pref) = N_Identifier
1562 and then Ekind (Entity (Pref)) = E_Variable
1563 and then Present (Extra_Constrained (Entity (Pref)))
1567 (Extra_Constrained (Entity (Pref)), Sloc (N)));
1569 -- For all other entity names, we can tell at compile time
1571 elsif Is_Entity_Name (Pref) then
1573 Ent : constant Entity_Id := Entity (Pref);
1577 -- (RM J.4) obsolescent cases
1579 if Is_Type (Ent) then
1583 if Is_Private_Type (Ent) then
1584 Res := not Has_Discriminants (Ent)
1585 or else Is_Constrained (Ent);
1587 -- It not a private type, must be a generic actual type
1588 -- that corresponded to a private type. We know that this
1589 -- correspondence holds, since otherwise the reference
1590 -- within the generic template would have been illegal.
1593 if Is_Composite_Type (Underlying_Type (Ent)) then
1594 Res := Is_Constrained (Ent);
1600 -- If the prefix is not a variable or is aliased, then
1601 -- definitely true; if it's a formal parameter without an
1602 -- associated extra formal, then treat it as constrained.
1604 -- Ada 2005 (AI-363): An aliased prefix must be known to be
1605 -- constrained in order to set the attribute to True.
1607 elsif not Is_Variable (Pref)
1608 or else Present (Formal_Ent)
1609 or else (Ada_Version < Ada_05
1610 and then Is_Aliased_View (Pref))
1611 or else (Ada_Version >= Ada_05
1612 and then Is_Constrained_Aliased_View (Pref))
1616 -- Variable case, look at type to see if it is constrained.
1617 -- Note that the one case where this is not accurate (the
1618 -- procedure formal case), has been handled above.
1620 -- We use the Underlying_Type here (and below) in case the
1621 -- type is private without discriminants, but the full type
1622 -- has discriminants. This case is illegal, but we generate it
1623 -- internally for passing to the Extra_Constrained parameter.
1626 Res := Is_Constrained (Underlying_Type (Etype (Ent)));
1630 New_Reference_To (Boolean_Literals (Res), Loc));
1633 -- Prefix is not an entity name. These are also cases where we can
1634 -- always tell at compile time by looking at the form and type of the
1635 -- prefix. If an explicit dereference of an object with constrained
1636 -- partial view, this is unconstrained (Ada 2005 AI-363).
1642 not Is_Variable (Pref)
1644 (Nkind (Pref) = N_Explicit_Dereference
1646 not Has_Constrained_Partial_View (Base_Type (Ptyp)))
1647 or else Is_Constrained (Underlying_Type (Ptyp))),
1651 Analyze_And_Resolve (N, Standard_Boolean);
1658 -- Transforms 'Copy_Sign into a call to the floating-point attribute
1659 -- function Copy_Sign in Fat_xxx (where xxx is the root type)
1661 when Attribute_Copy_Sign =>
1662 Expand_Fpt_Attribute_RR (N);
1668 -- Transforms 'Count attribute into a call to the Count function
1670 when Attribute_Count => Count : declare
1672 Conctyp : Entity_Id;
1674 Entry_Id : Entity_Id;
1679 -- If the prefix is a member of an entry family, retrieve both
1680 -- entry name and index. For a simple entry there is no index.
1682 if Nkind (Pref) = N_Indexed_Component then
1683 Entnam := Prefix (Pref);
1684 Index := First (Expressions (Pref));
1690 Entry_Id := Entity (Entnam);
1692 -- Find the concurrent type in which this attribute is referenced
1693 -- (there had better be one).
1695 Conctyp := Current_Scope;
1696 while not Is_Concurrent_Type (Conctyp) loop
1697 Conctyp := Scope (Conctyp);
1702 if Is_Protected_Type (Conctyp) then
1703 case Corresponding_Runtime_Package (Conctyp) is
1704 when System_Tasking_Protected_Objects_Entries =>
1705 Name := New_Reference_To (RTE (RE_Protected_Count), Loc);
1708 Make_Function_Call (Loc,
1710 Parameter_Associations => New_List (
1712 (Find_Protection_Object (Current_Scope), Loc),
1713 Entry_Index_Expression
1714 (Loc, Entry_Id, Index, Scope (Entry_Id))));
1716 when System_Tasking_Protected_Objects_Single_Entry =>
1718 New_Reference_To (RTE (RE_Protected_Count_Entry), Loc);
1721 Make_Function_Call (Loc,
1723 Parameter_Associations => New_List (
1725 (Find_Protection_Object (Current_Scope), Loc)));
1728 raise Program_Error;
1735 Make_Function_Call (Loc,
1736 Name => New_Reference_To (RTE (RE_Task_Count), Loc),
1737 Parameter_Associations => New_List (
1738 Entry_Index_Expression (Loc,
1739 Entry_Id, Index, Scope (Entry_Id))));
1742 -- The call returns type Natural but the context is universal integer
1743 -- so any integer type is allowed. The attribute was already resolved
1744 -- so its Etype is the required result type. If the base type of the
1745 -- context type is other than Standard.Integer we put in a conversion
1746 -- to the required type. This can be a normal typed conversion since
1747 -- both input and output types of the conversion are integer types
1749 if Base_Type (Typ) /= Base_Type (Standard_Integer) then
1750 Rewrite (N, Convert_To (Typ, Call));
1755 Analyze_And_Resolve (N, Typ);
1762 -- This processing is shared by Elab_Spec
1764 -- What we do is to insert the following declarations
1767 -- pragma Import (C, enn, "name___elabb/s");
1769 -- and then the Elab_Body/Spec attribute is replaced by a reference
1770 -- to this defining identifier.
1772 when Attribute_Elab_Body |
1773 Attribute_Elab_Spec =>
1776 Ent : constant Entity_Id :=
1777 Make_Defining_Identifier (Loc,
1778 New_Internal_Name ('E'));
1782 procedure Make_Elab_String (Nod : Node_Id);
1783 -- Given Nod, an identifier, or a selected component, put the
1784 -- image into the current string literal, with double underline
1785 -- between components.
1787 ----------------------
1788 -- Make_Elab_String --
1789 ----------------------
1791 procedure Make_Elab_String (Nod : Node_Id) is
1793 if Nkind (Nod) = N_Selected_Component then
1794 Make_Elab_String (Prefix (Nod));
1798 Store_String_Char ('$');
1800 Store_String_Char ('.');
1802 Store_String_Char ('_');
1803 Store_String_Char ('_');
1806 Get_Name_String (Chars (Selector_Name (Nod)));
1809 pragma Assert (Nkind (Nod) = N_Identifier);
1810 Get_Name_String (Chars (Nod));
1813 Store_String_Chars (Name_Buffer (1 .. Name_Len));
1814 end Make_Elab_String;
1816 -- Start of processing for Elab_Body/Elab_Spec
1819 -- First we need to prepare the string literal for the name of
1820 -- the elaboration routine to be referenced.
1823 Make_Elab_String (Pref);
1825 if VM_Target = No_VM then
1826 Store_String_Chars ("___elab");
1827 Lang := Make_Identifier (Loc, Name_C);
1829 Store_String_Chars ("._elab");
1830 Lang := Make_Identifier (Loc, Name_Ada);
1833 if Id = Attribute_Elab_Body then
1834 Store_String_Char ('b');
1836 Store_String_Char ('s');
1841 Insert_Actions (N, New_List (
1842 Make_Subprogram_Declaration (Loc,
1844 Make_Procedure_Specification (Loc,
1845 Defining_Unit_Name => Ent)),
1848 Chars => Name_Import,
1849 Pragma_Argument_Associations => New_List (
1850 Make_Pragma_Argument_Association (Loc,
1851 Expression => Lang),
1853 Make_Pragma_Argument_Association (Loc,
1855 Make_Identifier (Loc, Chars (Ent))),
1857 Make_Pragma_Argument_Association (Loc,
1859 Make_String_Literal (Loc, Str))))));
1861 Set_Entity (N, Ent);
1862 Rewrite (N, New_Occurrence_Of (Ent, Loc));
1869 -- Elaborated is always True for preelaborated units, predefined units,
1870 -- pure units and units which have Elaborate_Body pragmas. These units
1871 -- have no elaboration entity.
1873 -- Note: The Elaborated attribute is never passed to the back end
1875 when Attribute_Elaborated => Elaborated : declare
1876 Ent : constant Entity_Id := Entity (Pref);
1879 if Present (Elaboration_Entity (Ent)) then
1881 New_Occurrence_Of (Elaboration_Entity (Ent), Loc));
1883 Rewrite (N, New_Occurrence_Of (Standard_True, Loc));
1891 when Attribute_Enum_Rep => Enum_Rep :
1893 -- X'Enum_Rep (Y) expands to
1897 -- This is simply a direct conversion from the enumeration type to
1898 -- the target integer type, which is treated by the back end as a
1899 -- normal integer conversion, treating the enumeration type as an
1900 -- integer, which is exactly what we want! We set Conversion_OK to
1901 -- make sure that the analyzer does not complain about what otherwise
1902 -- might be an illegal conversion.
1904 if Is_Non_Empty_List (Exprs) then
1906 OK_Convert_To (Typ, Relocate_Node (First (Exprs))));
1908 -- X'Enum_Rep where X is an enumeration literal is replaced by
1909 -- the literal value.
1911 elsif Ekind (Entity (Pref)) = E_Enumeration_Literal then
1913 Make_Integer_Literal (Loc, Enumeration_Rep (Entity (Pref))));
1915 -- If this is a renaming of a literal, recover the representation
1918 elsif Ekind (Entity (Pref)) = E_Constant
1919 and then Present (Renamed_Object (Entity (Pref)))
1921 Ekind (Entity (Renamed_Object (Entity (Pref))))
1922 = E_Enumeration_Literal
1925 Make_Integer_Literal (Loc,
1926 Enumeration_Rep (Entity (Renamed_Object (Entity (Pref))))));
1928 -- X'Enum_Rep where X is an object does a direct unchecked conversion
1929 -- of the object value, as described for the type case above.
1933 OK_Convert_To (Typ, Relocate_Node (Pref)));
1937 Analyze_And_Resolve (N, Typ);
1944 when Attribute_Enum_Val => Enum_Val : declare
1946 Btyp : constant Entity_Id := Base_Type (Ptyp);
1949 -- X'Enum_Val (Y) expands to
1951 -- [constraint_error when _rep_to_pos (Y, False) = -1, msg]
1954 Expr := Unchecked_Convert_To (Ptyp, First (Exprs));
1957 Make_Raise_Constraint_Error (Loc,
1961 Make_Function_Call (Loc,
1963 New_Reference_To (TSS (Btyp, TSS_Rep_To_Pos), Loc),
1964 Parameter_Associations => New_List (
1965 Relocate_Node (Duplicate_Subexpr (Expr)),
1966 New_Occurrence_Of (Standard_False, Loc))),
1968 Right_Opnd => Make_Integer_Literal (Loc, -1)),
1969 Reason => CE_Range_Check_Failed));
1972 Analyze_And_Resolve (N, Ptyp);
1979 -- Transforms 'Exponent into a call to the floating-point attribute
1980 -- function Exponent in Fat_xxx (where xxx is the root type)
1982 when Attribute_Exponent =>
1983 Expand_Fpt_Attribute_R (N);
1989 -- transforme X'External_Tag into Ada.Tags.External_Tag (X'tag)
1991 when Attribute_External_Tag => External_Tag :
1994 Make_Function_Call (Loc,
1995 Name => New_Reference_To (RTE (RE_External_Tag), Loc),
1996 Parameter_Associations => New_List (
1997 Make_Attribute_Reference (Loc,
1998 Attribute_Name => Name_Tag,
1999 Prefix => Prefix (N)))));
2001 Analyze_And_Resolve (N, Standard_String);
2008 when Attribute_First =>
2010 -- If the prefix type is a constrained packed array type which
2011 -- already has a Packed_Array_Type representation defined, then
2012 -- replace this attribute with a direct reference to 'First of the
2013 -- appropriate index subtype (since otherwise the back end will try
2014 -- to give us the value of 'First for this implementation type).
2016 if Is_Constrained_Packed_Array (Ptyp) then
2018 Make_Attribute_Reference (Loc,
2019 Attribute_Name => Name_First,
2020 Prefix => New_Reference_To (Get_Index_Subtype (N), Loc)));
2021 Analyze_And_Resolve (N, Typ);
2023 elsif Is_Access_Type (Ptyp) then
2024 Apply_Access_Check (N);
2031 -- Compute this if component clause was present, otherwise we leave the
2032 -- computation to be completed in the back-end, since we don't know what
2033 -- layout will be chosen.
2035 when Attribute_First_Bit => First_Bit : declare
2036 CE : constant Entity_Id := Entity (Selector_Name (Pref));
2039 if Known_Static_Component_Bit_Offset (CE) then
2041 Make_Integer_Literal (Loc,
2042 Component_Bit_Offset (CE) mod System_Storage_Unit));
2044 Analyze_And_Resolve (N, Typ);
2047 Apply_Universal_Integer_Attribute_Checks (N);
2057 -- fixtype'Fixed_Value (integer-value)
2061 -- fixtype(integer-value)
2063 -- We do all the required analysis of the conversion here, because we do
2064 -- not want this to go through the fixed-point conversion circuits. Note
2065 -- that the back end always treats fixed-point as equivalent to the
2066 -- corresponding integer type anyway.
2068 when Attribute_Fixed_Value => Fixed_Value :
2071 Make_Type_Conversion (Loc,
2072 Subtype_Mark => New_Occurrence_Of (Entity (Pref), Loc),
2073 Expression => Relocate_Node (First (Exprs))));
2074 Set_Etype (N, Entity (Pref));
2077 -- Note: it might appear that a properly analyzed unchecked conversion
2078 -- would be just fine here, but that's not the case, since the full
2079 -- range checks performed by the following call are critical!
2081 Apply_Type_Conversion_Checks (N);
2088 -- Transforms 'Floor into a call to the floating-point attribute
2089 -- function Floor in Fat_xxx (where xxx is the root type)
2091 when Attribute_Floor =>
2092 Expand_Fpt_Attribute_R (N);
2098 -- For the fixed-point type Typ:
2104 -- Result_Type (System.Fore (Universal_Real (Type'First)),
2105 -- Universal_Real (Type'Last))
2107 -- Note that we know that the type is a non-static subtype, or Fore
2108 -- would have itself been computed dynamically in Eval_Attribute.
2110 when Attribute_Fore => Fore : begin
2113 Make_Function_Call (Loc,
2114 Name => New_Reference_To (RTE (RE_Fore), Loc),
2116 Parameter_Associations => New_List (
2117 Convert_To (Universal_Real,
2118 Make_Attribute_Reference (Loc,
2119 Prefix => New_Reference_To (Ptyp, Loc),
2120 Attribute_Name => Name_First)),
2122 Convert_To (Universal_Real,
2123 Make_Attribute_Reference (Loc,
2124 Prefix => New_Reference_To (Ptyp, Loc),
2125 Attribute_Name => Name_Last))))));
2127 Analyze_And_Resolve (N, Typ);
2134 -- Transforms 'Fraction into a call to the floating-point attribute
2135 -- function Fraction in Fat_xxx (where xxx is the root type)
2137 when Attribute_Fraction =>
2138 Expand_Fpt_Attribute_R (N);
2144 when Attribute_From_Any => From_Any : declare
2145 P_Type : constant Entity_Id := Etype (Pref);
2146 Decls : constant List_Id := New_List;
2149 Build_From_Any_Call (P_Type,
2150 Relocate_Node (First (Exprs)),
2152 Insert_Actions (N, Decls);
2153 Analyze_And_Resolve (N, P_Type);
2160 -- For an exception returns a reference to the exception data:
2161 -- Exception_Id!(Prefix'Reference)
2163 -- For a task it returns a reference to the _task_id component of
2164 -- corresponding record:
2166 -- taskV!(Prefix)._Task_Id, converted to the type Task_Id defined
2168 -- in Ada.Task_Identification
2170 when Attribute_Identity => Identity : declare
2171 Id_Kind : Entity_Id;
2174 if Ptyp = Standard_Exception_Type then
2175 Id_Kind := RTE (RE_Exception_Id);
2177 if Present (Renamed_Object (Entity (Pref))) then
2178 Set_Entity (Pref, Renamed_Object (Entity (Pref)));
2182 Unchecked_Convert_To (Id_Kind, Make_Reference (Loc, Pref)));
2184 Id_Kind := RTE (RO_AT_Task_Id);
2186 -- If the prefix is a task interface, the Task_Id is obtained
2187 -- dynamically through a dispatching call, as for other task
2188 -- attributes applied to interfaces.
2190 if Ada_Version >= Ada_05
2191 and then Ekind (Ptyp) = E_Class_Wide_Type
2192 and then Is_Interface (Ptyp)
2193 and then Is_Task_Interface (Ptyp)
2196 Unchecked_Convert_To (Id_Kind,
2197 Make_Selected_Component (Loc,
2199 New_Copy_Tree (Pref),
2201 Make_Identifier (Loc, Name_uDisp_Get_Task_Id))));
2205 Unchecked_Convert_To (Id_Kind, Concurrent_Ref (Pref)));
2209 Analyze_And_Resolve (N, Id_Kind);
2216 -- Image attribute is handled in separate unit Exp_Imgv
2218 when Attribute_Image =>
2219 Exp_Imgv.Expand_Image_Attribute (N);
2225 -- X'Img is expanded to typ'Image (X), where typ is the type of X
2227 when Attribute_Img => Img :
2230 Make_Attribute_Reference (Loc,
2231 Prefix => New_Reference_To (Ptyp, Loc),
2232 Attribute_Name => Name_Image,
2233 Expressions => New_List (Relocate_Node (Pref))));
2235 Analyze_And_Resolve (N, Standard_String);
2242 when Attribute_Input => Input : declare
2243 P_Type : constant Entity_Id := Entity (Pref);
2244 B_Type : constant Entity_Id := Base_Type (P_Type);
2245 U_Type : constant Entity_Id := Underlying_Type (P_Type);
2246 Strm : constant Node_Id := First (Exprs);
2254 Cntrl : Node_Id := Empty;
2255 -- Value for controlling argument in call. Always Empty except in
2256 -- the dispatching (class-wide type) case, where it is a reference
2257 -- to the dummy object initialized to the right internal tag.
2259 procedure Freeze_Stream_Subprogram (F : Entity_Id);
2260 -- The expansion of the attribute reference may generate a call to
2261 -- a user-defined stream subprogram that is frozen by the call. This
2262 -- can lead to access-before-elaboration problem if the reference
2263 -- appears in an object declaration and the subprogram body has not
2264 -- been seen. The freezing of the subprogram requires special code
2265 -- because it appears in an expanded context where expressions do
2266 -- not freeze their constituents.
2268 ------------------------------
2269 -- Freeze_Stream_Subprogram --
2270 ------------------------------
2272 procedure Freeze_Stream_Subprogram (F : Entity_Id) is
2273 Decl : constant Node_Id := Unit_Declaration_Node (F);
2277 -- If this is user-defined subprogram, the corresponding
2278 -- stream function appears as a renaming-as-body, and the
2279 -- user subprogram must be retrieved by tree traversal.
2282 and then Nkind (Decl) = N_Subprogram_Declaration
2283 and then Present (Corresponding_Body (Decl))
2285 Bod := Corresponding_Body (Decl);
2287 if Nkind (Unit_Declaration_Node (Bod)) =
2288 N_Subprogram_Renaming_Declaration
2290 Set_Is_Frozen (Entity (Name (Unit_Declaration_Node (Bod))));
2293 end Freeze_Stream_Subprogram;
2295 -- Start of processing for Input
2298 -- If no underlying type, we have an error that will be diagnosed
2299 -- elsewhere, so here we just completely ignore the expansion.
2305 -- If there is a TSS for Input, just call it
2307 Fname := Find_Stream_Subprogram (P_Type, TSS_Stream_Input);
2309 if Present (Fname) then
2313 -- If there is a Stream_Convert pragma, use it, we rewrite
2315 -- sourcetyp'Input (stream)
2319 -- sourcetyp (streamread (strmtyp'Input (stream)));
2321 -- where streamread is the given Read function that converts an
2322 -- argument of type strmtyp to type sourcetyp or a type from which
2323 -- it is derived (extra conversion required for the derived case).
2325 Prag := Get_Stream_Convert_Pragma (P_Type);
2327 if Present (Prag) then
2328 Arg2 := Next (First (Pragma_Argument_Associations (Prag)));
2329 Rfunc := Entity (Expression (Arg2));
2333 Make_Function_Call (Loc,
2334 Name => New_Occurrence_Of (Rfunc, Loc),
2335 Parameter_Associations => New_List (
2336 Make_Attribute_Reference (Loc,
2339 (Etype (First_Formal (Rfunc)), Loc),
2340 Attribute_Name => Name_Input,
2341 Expressions => Exprs)))));
2343 Analyze_And_Resolve (N, B_Type);
2348 elsif Is_Elementary_Type (U_Type) then
2350 -- A special case arises if we have a defined _Read routine,
2351 -- since in this case we are required to call this routine.
2353 if Present (TSS (Base_Type (U_Type), TSS_Stream_Read)) then
2354 Build_Record_Or_Elementary_Input_Function
2355 (Loc, U_Type, Decl, Fname);
2356 Insert_Action (N, Decl);
2358 -- For normal cases, we call the I_xxx routine directly
2361 Rewrite (N, Build_Elementary_Input_Call (N));
2362 Analyze_And_Resolve (N, P_Type);
2368 elsif Is_Array_Type (U_Type) then
2369 Build_Array_Input_Function (Loc, U_Type, Decl, Fname);
2370 Compile_Stream_Body_In_Scope (N, Decl, U_Type, Check => False);
2372 -- Dispatching case with class-wide type
2374 elsif Is_Class_Wide_Type (P_Type) then
2376 -- No need to do anything else compiling under restriction
2377 -- No_Dispatching_Calls. During the semantic analysis we
2378 -- already notified such violation.
2380 if Restriction_Active (No_Dispatching_Calls) then
2385 Rtyp : constant Entity_Id := Root_Type (P_Type);
2390 -- Read the internal tag (RM 13.13.2(34)) and use it to
2391 -- initialize a dummy tag object:
2393 -- Dnn : Ada.Tags.Tag
2394 -- := Descendant_Tag (String'Input (Strm), P_Type);
2396 -- This dummy object is used only to provide a controlling
2397 -- argument for the eventual _Input call. Descendant_Tag is
2398 -- called rather than Internal_Tag to ensure that we have a
2399 -- tag for a type that is descended from the prefix type and
2400 -- declared at the same accessibility level (the exception
2401 -- Tag_Error will be raised otherwise). The level check is
2402 -- required for Ada 2005 because tagged types can be
2403 -- extended in nested scopes (AI-344).
2406 Make_Defining_Identifier (Loc,
2407 Chars => New_Internal_Name ('D'));
2410 Make_Object_Declaration (Loc,
2411 Defining_Identifier => Dnn,
2412 Object_Definition =>
2413 New_Occurrence_Of (RTE (RE_Tag), Loc),
2415 Make_Function_Call (Loc,
2417 New_Occurrence_Of (RTE (RE_Descendant_Tag), Loc),
2418 Parameter_Associations => New_List (
2419 Make_Attribute_Reference (Loc,
2421 New_Occurrence_Of (Standard_String, Loc),
2422 Attribute_Name => Name_Input,
2423 Expressions => New_List (
2425 (Duplicate_Subexpr (Strm)))),
2426 Make_Attribute_Reference (Loc,
2427 Prefix => New_Reference_To (P_Type, Loc),
2428 Attribute_Name => Name_Tag))));
2430 Insert_Action (N, Decl);
2432 -- Now we need to get the entity for the call, and construct
2433 -- a function call node, where we preset a reference to Dnn
2434 -- as the controlling argument (doing an unchecked convert
2435 -- to the class-wide tagged type to make it look like a real
2438 Fname := Find_Prim_Op (Rtyp, TSS_Stream_Input);
2439 Cntrl := Unchecked_Convert_To (P_Type,
2440 New_Occurrence_Of (Dnn, Loc));
2441 Set_Etype (Cntrl, P_Type);
2442 Set_Parent (Cntrl, N);
2445 -- For tagged types, use the primitive Input function
2447 elsif Is_Tagged_Type (U_Type) then
2448 Fname := Find_Prim_Op (U_Type, TSS_Stream_Input);
2450 -- All other record type cases, including protected records. The
2451 -- latter only arise for expander generated code for handling
2452 -- shared passive partition access.
2456 (Is_Record_Type (U_Type) or else Is_Protected_Type (U_Type));
2458 -- Ada 2005 (AI-216): Program_Error is raised executing default
2459 -- implementation of the Input attribute of an unchecked union
2460 -- type if the type lacks default discriminant values.
2462 if Is_Unchecked_Union (Base_Type (U_Type))
2463 and then No (Discriminant_Constraint (U_Type))
2466 Make_Raise_Program_Error (Loc,
2467 Reason => PE_Unchecked_Union_Restriction));
2472 Build_Record_Or_Elementary_Input_Function
2473 (Loc, Base_Type (U_Type), Decl, Fname);
2474 Insert_Action (N, Decl);
2476 if Nkind (Parent (N)) = N_Object_Declaration
2477 and then Is_Record_Type (U_Type)
2479 -- The stream function may contain calls to user-defined
2480 -- Read procedures for individual components.
2487 Comp := First_Component (U_Type);
2488 while Present (Comp) loop
2490 Find_Stream_Subprogram
2491 (Etype (Comp), TSS_Stream_Read);
2493 if Present (Func) then
2494 Freeze_Stream_Subprogram (Func);
2497 Next_Component (Comp);
2504 -- If we fall through, Fname is the function to be called. The result
2505 -- is obtained by calling the appropriate function, then converting
2506 -- the result. The conversion does a subtype check.
2509 Make_Function_Call (Loc,
2510 Name => New_Occurrence_Of (Fname, Loc),
2511 Parameter_Associations => New_List (
2512 Relocate_Node (Strm)));
2514 Set_Controlling_Argument (Call, Cntrl);
2515 Rewrite (N, Unchecked_Convert_To (P_Type, Call));
2516 Analyze_And_Resolve (N, P_Type);
2518 if Nkind (Parent (N)) = N_Object_Declaration then
2519 Freeze_Stream_Subprogram (Fname);
2529 -- inttype'Fixed_Value (fixed-value)
2533 -- inttype(integer-value))
2535 -- we do all the required analysis of the conversion here, because we do
2536 -- not want this to go through the fixed-point conversion circuits. Note
2537 -- that the back end always treats fixed-point as equivalent to the
2538 -- corresponding integer type anyway.
2540 when Attribute_Integer_Value => Integer_Value :
2543 Make_Type_Conversion (Loc,
2544 Subtype_Mark => New_Occurrence_Of (Entity (Pref), Loc),
2545 Expression => Relocate_Node (First (Exprs))));
2546 Set_Etype (N, Entity (Pref));
2549 -- Note: it might appear that a properly analyzed unchecked conversion
2550 -- would be just fine here, but that's not the case, since the full
2551 -- range checks performed by the following call are critical!
2553 Apply_Type_Conversion_Checks (N);
2560 when Attribute_Invalid_Value =>
2561 Rewrite (N, Get_Simple_Init_Val (Ptyp, N));
2567 when Attribute_Last =>
2569 -- If the prefix type is a constrained packed array type which
2570 -- already has a Packed_Array_Type representation defined, then
2571 -- replace this attribute with a direct reference to 'Last of the
2572 -- appropriate index subtype (since otherwise the back end will try
2573 -- to give us the value of 'Last for this implementation type).
2575 if Is_Constrained_Packed_Array (Ptyp) then
2577 Make_Attribute_Reference (Loc,
2578 Attribute_Name => Name_Last,
2579 Prefix => New_Reference_To (Get_Index_Subtype (N), Loc)));
2580 Analyze_And_Resolve (N, Typ);
2582 elsif Is_Access_Type (Ptyp) then
2583 Apply_Access_Check (N);
2590 -- We compute this if a component clause was present, otherwise we leave
2591 -- the computation up to the back end, since we don't know what layout
2594 when Attribute_Last_Bit => Last_Bit : declare
2595 CE : constant Entity_Id := Entity (Selector_Name (Pref));
2598 if Known_Static_Component_Bit_Offset (CE)
2599 and then Known_Static_Esize (CE)
2602 Make_Integer_Literal (Loc,
2603 Intval => (Component_Bit_Offset (CE) mod System_Storage_Unit)
2606 Analyze_And_Resolve (N, Typ);
2609 Apply_Universal_Integer_Attribute_Checks (N);
2617 -- Transforms 'Leading_Part into a call to the floating-point attribute
2618 -- function Leading_Part in Fat_xxx (where xxx is the root type)
2620 -- Note: strictly, we should generate special case code to deal with
2621 -- absurdly large positive arguments (greater than Integer'Last), which
2622 -- result in returning the first argument unchanged, but it hardly seems
2623 -- worth the effort. We raise constraint error for absurdly negative
2624 -- arguments which is fine.
2626 when Attribute_Leading_Part =>
2627 Expand_Fpt_Attribute_RI (N);
2633 when Attribute_Length => declare
2638 -- Processing for packed array types
2640 if Is_Array_Type (Ptyp) and then Is_Packed (Ptyp) then
2641 Ityp := Get_Index_Subtype (N);
2643 -- If the index type, Ityp, is an enumeration type with holes,
2644 -- then we calculate X'Length explicitly using
2647 -- (0, Ityp'Pos (X'Last (N)) -
2648 -- Ityp'Pos (X'First (N)) + 1);
2650 -- Since the bounds in the template are the representation values
2651 -- and the back end would get the wrong value.
2653 if Is_Enumeration_Type (Ityp)
2654 and then Present (Enum_Pos_To_Rep (Base_Type (Ityp)))
2659 Xnum := Expr_Value (First (Expressions (N)));
2663 Make_Attribute_Reference (Loc,
2664 Prefix => New_Occurrence_Of (Typ, Loc),
2665 Attribute_Name => Name_Max,
2666 Expressions => New_List
2667 (Make_Integer_Literal (Loc, 0),
2671 Make_Op_Subtract (Loc,
2673 Make_Attribute_Reference (Loc,
2674 Prefix => New_Occurrence_Of (Ityp, Loc),
2675 Attribute_Name => Name_Pos,
2677 Expressions => New_List (
2678 Make_Attribute_Reference (Loc,
2679 Prefix => Duplicate_Subexpr (Pref),
2680 Attribute_Name => Name_Last,
2681 Expressions => New_List (
2682 Make_Integer_Literal (Loc, Xnum))))),
2685 Make_Attribute_Reference (Loc,
2686 Prefix => New_Occurrence_Of (Ityp, Loc),
2687 Attribute_Name => Name_Pos,
2689 Expressions => New_List (
2690 Make_Attribute_Reference (Loc,
2692 Duplicate_Subexpr_No_Checks (Pref),
2693 Attribute_Name => Name_First,
2694 Expressions => New_List (
2695 Make_Integer_Literal (Loc, Xnum)))))),
2697 Right_Opnd => Make_Integer_Literal (Loc, 1)))));
2699 Analyze_And_Resolve (N, Typ, Suppress => All_Checks);
2702 -- If the prefix type is a constrained packed array type which
2703 -- already has a Packed_Array_Type representation defined, then
2704 -- replace this attribute with a direct reference to 'Range_Length
2705 -- of the appropriate index subtype (since otherwise the back end
2706 -- will try to give us the value of 'Length for this
2707 -- implementation type).
2709 elsif Is_Constrained (Ptyp) then
2711 Make_Attribute_Reference (Loc,
2712 Attribute_Name => Name_Range_Length,
2713 Prefix => New_Reference_To (Ityp, Loc)));
2714 Analyze_And_Resolve (N, Typ);
2719 elsif Is_Access_Type (Ptyp) then
2720 Apply_Access_Check (N);
2722 -- If the designated type is a packed array type, then we convert
2723 -- the reference to:
2726 -- xtyp'Pos (Pref'Last (Expr)) -
2727 -- xtyp'Pos (Pref'First (Expr)));
2729 -- This is a bit complex, but it is the easiest thing to do that
2730 -- works in all cases including enum types with holes xtyp here
2731 -- is the appropriate index type.
2734 Dtyp : constant Entity_Id := Designated_Type (Ptyp);
2738 if Is_Array_Type (Dtyp) and then Is_Packed (Dtyp) then
2739 Xtyp := Get_Index_Subtype (N);
2742 Make_Attribute_Reference (Loc,
2743 Prefix => New_Occurrence_Of (Typ, Loc),
2744 Attribute_Name => Name_Max,
2745 Expressions => New_List (
2746 Make_Integer_Literal (Loc, 0),
2749 Make_Integer_Literal (Loc, 1),
2750 Make_Op_Subtract (Loc,
2752 Make_Attribute_Reference (Loc,
2753 Prefix => New_Occurrence_Of (Xtyp, Loc),
2754 Attribute_Name => Name_Pos,
2755 Expressions => New_List (
2756 Make_Attribute_Reference (Loc,
2757 Prefix => Duplicate_Subexpr (Pref),
2758 Attribute_Name => Name_Last,
2760 New_Copy_List (Exprs)))),
2763 Make_Attribute_Reference (Loc,
2764 Prefix => New_Occurrence_Of (Xtyp, Loc),
2765 Attribute_Name => Name_Pos,
2766 Expressions => New_List (
2767 Make_Attribute_Reference (Loc,
2769 Duplicate_Subexpr_No_Checks (Pref),
2770 Attribute_Name => Name_First,
2772 New_Copy_List (Exprs)))))))));
2774 Analyze_And_Resolve (N, Typ);
2778 -- Otherwise leave it to the back end
2781 Apply_Universal_Integer_Attribute_Checks (N);
2789 -- Transforms 'Machine into a call to the floating-point attribute
2790 -- function Machine in Fat_xxx (where xxx is the root type)
2792 when Attribute_Machine =>
2793 Expand_Fpt_Attribute_R (N);
2795 ----------------------
2796 -- Machine_Rounding --
2797 ----------------------
2799 -- Transforms 'Machine_Rounding into a call to the floating-point
2800 -- attribute function Machine_Rounding in Fat_xxx (where xxx is the root
2801 -- type). Expansion is avoided for cases the back end can handle
2804 when Attribute_Machine_Rounding =>
2805 if not Is_Inline_Floating_Point_Attribute (N) then
2806 Expand_Fpt_Attribute_R (N);
2813 -- Machine_Size is equivalent to Object_Size, so transform it into
2814 -- Object_Size and that way the back end never sees Machine_Size.
2816 when Attribute_Machine_Size =>
2818 Make_Attribute_Reference (Loc,
2819 Prefix => Prefix (N),
2820 Attribute_Name => Name_Object_Size));
2822 Analyze_And_Resolve (N, Typ);
2828 -- The only case that can get this far is the dynamic case of the old
2829 -- Ada 83 Mantissa attribute for the fixed-point case. For this case,
2836 -- ityp (System.Mantissa.Mantissa_Value
2837 -- (Integer'Integer_Value (typ'First),
2838 -- Integer'Integer_Value (typ'Last)));
2840 when Attribute_Mantissa => Mantissa : begin
2843 Make_Function_Call (Loc,
2844 Name => New_Occurrence_Of (RTE (RE_Mantissa_Value), Loc),
2846 Parameter_Associations => New_List (
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_First))),
2857 Make_Attribute_Reference (Loc,
2858 Prefix => New_Occurrence_Of (Standard_Integer, Loc),
2859 Attribute_Name => Name_Integer_Value,
2860 Expressions => New_List (
2862 Make_Attribute_Reference (Loc,
2863 Prefix => New_Occurrence_Of (Ptyp, Loc),
2864 Attribute_Name => Name_Last)))))));
2866 Analyze_And_Resolve (N, Typ);
2869 --------------------
2870 -- Mechanism_Code --
2871 --------------------
2873 when Attribute_Mechanism_Code =>
2875 -- We must replace the prefix in the renamed case
2877 if Is_Entity_Name (Pref)
2878 and then Present (Alias (Entity (Pref)))
2880 Set_Renamed_Subprogram (Pref, Alias (Entity (Pref)));
2887 when Attribute_Mod => Mod_Case : declare
2888 Arg : constant Node_Id := Relocate_Node (First (Exprs));
2889 Hi : constant Node_Id := Type_High_Bound (Etype (Arg));
2890 Modv : constant Uint := Modulus (Btyp);
2894 -- This is not so simple. The issue is what type to use for the
2895 -- computation of the modular value.
2897 -- The easy case is when the modulus value is within the bounds
2898 -- of the signed integer type of the argument. In this case we can
2899 -- just do the computation in that signed integer type, and then
2900 -- do an ordinary conversion to the target type.
2902 if Modv <= Expr_Value (Hi) then
2907 Right_Opnd => Make_Integer_Literal (Loc, Modv))));
2909 -- Here we know that the modulus is larger than type'Last of the
2910 -- integer type. There are two cases to consider:
2912 -- a) The integer value is non-negative. In this case, it is
2913 -- returned as the result (since it is less than the modulus).
2915 -- b) The integer value is negative. In this case, we know that the
2916 -- result is modulus + value, where the value might be as small as
2917 -- -modulus. The trouble is what type do we use to do the subtract.
2918 -- No type will do, since modulus can be as big as 2**64, and no
2919 -- integer type accommodates this value. Let's do bit of algebra
2922 -- = modulus - (-value)
2923 -- = (modulus - 1) - (-value - 1)
2925 -- Now modulus - 1 is certainly in range of the modular type.
2926 -- -value is in the range 1 .. modulus, so -value -1 is in the
2927 -- range 0 .. modulus-1 which is in range of the modular type.
2928 -- Furthermore, (-value - 1) can be expressed as -(value + 1)
2929 -- which we can compute using the integer base type.
2931 -- Once this is done we analyze the conditional expression without
2932 -- range checks, because we know everything is in range, and we
2933 -- want to prevent spurious warnings on either branch.
2937 Make_Conditional_Expression (Loc,
2938 Expressions => New_List (
2940 Left_Opnd => Duplicate_Subexpr (Arg),
2941 Right_Opnd => Make_Integer_Literal (Loc, 0)),
2944 Duplicate_Subexpr_No_Checks (Arg)),
2946 Make_Op_Subtract (Loc,
2948 Make_Integer_Literal (Loc,
2949 Intval => Modv - 1),
2955 Left_Opnd => Duplicate_Subexpr_No_Checks (Arg),
2957 Make_Integer_Literal (Loc,
2958 Intval => 1))))))));
2962 Analyze_And_Resolve (N, Btyp, Suppress => All_Checks);
2969 -- Transforms 'Model into a call to the floating-point attribute
2970 -- function Model in Fat_xxx (where xxx is the root type)
2972 when Attribute_Model =>
2973 Expand_Fpt_Attribute_R (N);
2979 -- The processing for Object_Size shares the processing for Size
2985 when Attribute_Old => Old : declare
2986 Tnn : constant Entity_Id :=
2987 Make_Defining_Identifier (Loc,
2988 Chars => New_Internal_Name ('T'));
2993 -- Find the nearest subprogram body, ignoring _Preconditions
2997 Subp := Parent (Subp);
2998 exit when Nkind (Subp) = N_Subprogram_Body
2999 and then Chars (Defining_Entity (Subp)) /= Name_uPostconditions;
3002 -- Insert the assignment at the start of the declarations
3005 Make_Object_Declaration (Loc,
3006 Defining_Identifier => Tnn,
3007 Constant_Present => True,
3008 Object_Definition => New_Occurrence_Of (Etype (N), Loc),
3009 Expression => Pref);
3011 if Is_Empty_List (Declarations (Subp)) then
3012 Set_Declarations (Subp, New_List (Asn_Stm));
3015 Insert_Action (First (Declarations (Subp)), Asn_Stm);
3018 Rewrite (N, New_Occurrence_Of (Tnn, Loc));
3025 when Attribute_Output => Output : declare
3026 P_Type : constant Entity_Id := Entity (Pref);
3027 U_Type : constant Entity_Id := Underlying_Type (P_Type);
3035 -- If no underlying type, we have an error that will be diagnosed
3036 -- elsewhere, so here we just completely ignore the expansion.
3042 -- If TSS for Output is present, just call it
3044 Pname := Find_Stream_Subprogram (P_Type, TSS_Stream_Output);
3046 if Present (Pname) then
3050 -- If there is a Stream_Convert pragma, use it, we rewrite
3052 -- sourcetyp'Output (stream, Item)
3056 -- strmtyp'Output (Stream, strmwrite (acttyp (Item)));
3058 -- where strmwrite is the given Write function that converts an
3059 -- argument of type sourcetyp or a type acctyp, from which it is
3060 -- derived to type strmtyp. The conversion to acttyp is required
3061 -- for the derived case.
3063 Prag := Get_Stream_Convert_Pragma (P_Type);
3065 if Present (Prag) then
3067 Next (Next (First (Pragma_Argument_Associations (Prag))));
3068 Wfunc := Entity (Expression (Arg3));
3071 Make_Attribute_Reference (Loc,
3072 Prefix => New_Occurrence_Of (Etype (Wfunc), Loc),
3073 Attribute_Name => Name_Output,
3074 Expressions => New_List (
3075 Relocate_Node (First (Exprs)),
3076 Make_Function_Call (Loc,
3077 Name => New_Occurrence_Of (Wfunc, Loc),
3078 Parameter_Associations => New_List (
3079 OK_Convert_To (Etype (First_Formal (Wfunc)),
3080 Relocate_Node (Next (First (Exprs)))))))));
3085 -- For elementary types, we call the W_xxx routine directly.
3086 -- Note that the effect of Write and Output is identical for
3087 -- the case of an elementary type, since there are no
3088 -- discriminants or bounds.
3090 elsif Is_Elementary_Type (U_Type) then
3092 -- A special case arises if we have a defined _Write routine,
3093 -- since in this case we are required to call this routine.
3095 if Present (TSS (Base_Type (U_Type), TSS_Stream_Write)) then
3096 Build_Record_Or_Elementary_Output_Procedure
3097 (Loc, U_Type, Decl, Pname);
3098 Insert_Action (N, Decl);
3100 -- For normal cases, we call the W_xxx routine directly
3103 Rewrite (N, Build_Elementary_Write_Call (N));
3110 elsif Is_Array_Type (U_Type) then
3111 Build_Array_Output_Procedure (Loc, U_Type, Decl, Pname);
3112 Compile_Stream_Body_In_Scope (N, Decl, U_Type, Check => False);
3114 -- Class-wide case, first output external tag, then dispatch
3115 -- to the appropriate primitive Output function (RM 13.13.2(31)).
3117 elsif Is_Class_Wide_Type (P_Type) then
3119 -- No need to do anything else compiling under restriction
3120 -- No_Dispatching_Calls. During the semantic analysis we
3121 -- already notified such violation.
3123 if Restriction_Active (No_Dispatching_Calls) then
3128 Strm : constant Node_Id := First (Exprs);
3129 Item : constant Node_Id := Next (Strm);
3132 -- Ada 2005 (AI-344): Check that the accessibility level
3133 -- of the type of the output object is not deeper than
3134 -- that of the attribute's prefix type.
3136 -- if Get_Access_Level (Item'Tag)
3137 -- /= Get_Access_Level (P_Type'Tag)
3142 -- String'Output (Strm, External_Tag (Item'Tag));
3144 -- We cannot figure out a practical way to implement this
3145 -- accessibility check on virtual machines, so we omit it.
3147 if Ada_Version >= Ada_05
3148 and then Tagged_Type_Expansion
3151 Make_Implicit_If_Statement (N,
3155 Build_Get_Access_Level (Loc,
3156 Make_Attribute_Reference (Loc,
3159 Duplicate_Subexpr (Item,
3161 Attribute_Name => Name_Tag)),
3164 Make_Integer_Literal (Loc,
3165 Type_Access_Level (P_Type))),
3168 New_List (Make_Raise_Statement (Loc,
3170 RTE (RE_Tag_Error), Loc)))));
3174 Make_Attribute_Reference (Loc,
3175 Prefix => New_Occurrence_Of (Standard_String, Loc),
3176 Attribute_Name => Name_Output,
3177 Expressions => New_List (
3178 Relocate_Node (Duplicate_Subexpr (Strm)),
3179 Make_Function_Call (Loc,
3181 New_Occurrence_Of (RTE (RE_External_Tag), Loc),
3182 Parameter_Associations => New_List (
3183 Make_Attribute_Reference (Loc,
3186 (Duplicate_Subexpr (Item, Name_Req => True)),
3187 Attribute_Name => Name_Tag))))));
3190 Pname := Find_Prim_Op (U_Type, TSS_Stream_Output);
3192 -- Tagged type case, use the primitive Output function
3194 elsif Is_Tagged_Type (U_Type) then
3195 Pname := Find_Prim_Op (U_Type, TSS_Stream_Output);
3197 -- All other record type cases, including protected records.
3198 -- The latter only arise for expander generated code for
3199 -- handling shared passive partition access.
3203 (Is_Record_Type (U_Type) or else Is_Protected_Type (U_Type));
3205 -- Ada 2005 (AI-216): Program_Error is raised when executing
3206 -- the default implementation of the Output attribute of an
3207 -- unchecked union type if the type lacks default discriminant
3210 if Is_Unchecked_Union (Base_Type (U_Type))
3211 and then No (Discriminant_Constraint (U_Type))
3214 Make_Raise_Program_Error (Loc,
3215 Reason => PE_Unchecked_Union_Restriction));
3220 Build_Record_Or_Elementary_Output_Procedure
3221 (Loc, Base_Type (U_Type), Decl, Pname);
3222 Insert_Action (N, Decl);
3226 -- If we fall through, Pname is the name of the procedure to call
3228 Rewrite_Stream_Proc_Call (Pname);
3235 -- For enumeration types with a standard representation, Pos is
3236 -- handled by the back end.
3238 -- For enumeration types, with a non-standard representation we
3239 -- generate a call to the _Rep_To_Pos function created when the
3240 -- type was frozen. The call has the form
3242 -- _rep_to_pos (expr, flag)
3244 -- The parameter flag is True if range checks are enabled, causing
3245 -- Program_Error to be raised if the expression has an invalid
3246 -- representation, and False if range checks are suppressed.
3248 -- For integer types, Pos is equivalent to a simple integer
3249 -- conversion and we rewrite it as such
3251 when Attribute_Pos => Pos :
3253 Etyp : Entity_Id := Base_Type (Entity (Pref));
3256 -- Deal with zero/non-zero boolean values
3258 if Is_Boolean_Type (Etyp) then
3259 Adjust_Condition (First (Exprs));
3260 Etyp := Standard_Boolean;
3261 Set_Prefix (N, New_Occurrence_Of (Standard_Boolean, Loc));
3264 -- Case of enumeration type
3266 if Is_Enumeration_Type (Etyp) then
3268 -- Non-standard enumeration type (generate call)
3270 if Present (Enum_Pos_To_Rep (Etyp)) then
3271 Append_To (Exprs, Rep_To_Pos_Flag (Etyp, Loc));
3274 Make_Function_Call (Loc,
3276 New_Reference_To (TSS (Etyp, TSS_Rep_To_Pos), Loc),
3277 Parameter_Associations => Exprs)));
3279 Analyze_And_Resolve (N, Typ);
3281 -- Standard enumeration type (do universal integer check)
3284 Apply_Universal_Integer_Attribute_Checks (N);
3287 -- Deal with integer types (replace by conversion)
3289 elsif Is_Integer_Type (Etyp) then
3290 Rewrite (N, Convert_To (Typ, First (Exprs)));
3291 Analyze_And_Resolve (N, Typ);
3300 -- We compute this if a component clause was present, otherwise we leave
3301 -- the computation up to the back end, since we don't know what layout
3304 when Attribute_Position => Position :
3306 CE : constant Entity_Id := Entity (Selector_Name (Pref));
3309 if Present (Component_Clause (CE)) then
3311 Make_Integer_Literal (Loc,
3312 Intval => Component_Bit_Offset (CE) / System_Storage_Unit));
3313 Analyze_And_Resolve (N, Typ);
3316 Apply_Universal_Integer_Attribute_Checks (N);
3324 -- 1. Deal with enumeration types with holes
3325 -- 2. For floating-point, generate call to attribute function
3326 -- 3. For other cases, deal with constraint checking
3328 when Attribute_Pred => Pred :
3330 Etyp : constant Entity_Id := Base_Type (Ptyp);
3334 -- For enumeration types with non-standard representations, we
3335 -- expand typ'Pred (x) into
3337 -- Pos_To_Rep (Rep_To_Pos (x) - 1)
3339 -- If the representation is contiguous, we compute instead
3340 -- Lit1 + Rep_to_Pos (x -1), to catch invalid representations.
3341 -- The conversion function Enum_Pos_To_Rep is defined on the
3342 -- base type, not the subtype, so we have to use the base type
3343 -- explicitly for this and other enumeration attributes.
3345 if Is_Enumeration_Type (Ptyp)
3346 and then Present (Enum_Pos_To_Rep (Etyp))
3348 if Has_Contiguous_Rep (Etyp) then
3350 Unchecked_Convert_To (Ptyp,
3353 Make_Integer_Literal (Loc,
3354 Enumeration_Rep (First_Literal (Ptyp))),
3356 Make_Function_Call (Loc,
3359 (TSS (Etyp, TSS_Rep_To_Pos), Loc),
3361 Parameter_Associations =>
3363 Unchecked_Convert_To (Ptyp,
3364 Make_Op_Subtract (Loc,
3366 Unchecked_Convert_To (Standard_Integer,
3367 Relocate_Node (First (Exprs))),
3369 Make_Integer_Literal (Loc, 1))),
3370 Rep_To_Pos_Flag (Ptyp, Loc))))));
3373 -- Add Boolean parameter True, to request program errror if
3374 -- we have a bad representation on our hands. If checks are
3375 -- suppressed, then add False instead
3377 Append_To (Exprs, Rep_To_Pos_Flag (Ptyp, Loc));
3379 Make_Indexed_Component (Loc,
3382 (Enum_Pos_To_Rep (Etyp), Loc),
3383 Expressions => New_List (
3384 Make_Op_Subtract (Loc,
3386 Make_Function_Call (Loc,
3389 (TSS (Etyp, TSS_Rep_To_Pos), Loc),
3390 Parameter_Associations => Exprs),
3391 Right_Opnd => Make_Integer_Literal (Loc, 1)))));
3394 Analyze_And_Resolve (N, Typ);
3396 -- For floating-point, we transform 'Pred into a call to the Pred
3397 -- floating-point attribute function in Fat_xxx (xxx is root type)
3399 elsif Is_Floating_Point_Type (Ptyp) then
3400 Expand_Fpt_Attribute_R (N);
3401 Analyze_And_Resolve (N, Typ);
3403 -- For modular types, nothing to do (no overflow, since wraps)
3405 elsif Is_Modular_Integer_Type (Ptyp) then
3408 -- For other types, if argument is marked as needing a range check or
3409 -- overflow checking is enabled, we must generate a check.
3411 elsif not Overflow_Checks_Suppressed (Ptyp)
3412 or else Do_Range_Check (First (Exprs))
3414 Set_Do_Range_Check (First (Exprs), False);
3415 Expand_Pred_Succ (N);
3423 -- Ada 2005 (AI-327): Dynamic ceiling priorities
3425 -- We rewrite X'Priority as the following run-time call:
3427 -- Get_Ceiling (X._Object)
3429 -- Note that although X'Priority is notionally an object, it is quite
3430 -- deliberately not defined as an aliased object in the RM. This means
3431 -- that it works fine to rewrite it as a call, without having to worry
3432 -- about complications that would other arise from X'Priority'Access,
3433 -- which is illegal, because of the lack of aliasing.
3435 when Attribute_Priority =>
3438 Conctyp : Entity_Id;
3439 Object_Parm : Node_Id;
3441 RT_Subprg_Name : Node_Id;
3444 -- Look for the enclosing concurrent type
3446 Conctyp := Current_Scope;
3447 while not Is_Concurrent_Type (Conctyp) loop
3448 Conctyp := Scope (Conctyp);
3451 pragma Assert (Is_Protected_Type (Conctyp));
3453 -- Generate the actual of the call
3455 Subprg := Current_Scope;
3456 while not Present (Protected_Body_Subprogram (Subprg)) loop
3457 Subprg := Scope (Subprg);
3460 -- Use of 'Priority inside protected entries and barriers (in
3461 -- both cases the type of the first formal of their expanded
3462 -- subprogram is Address)
3464 if Etype (First_Entity (Protected_Body_Subprogram (Subprg)))
3468 New_Itype : Entity_Id;
3471 -- In the expansion of protected entries the type of the
3472 -- first formal of the Protected_Body_Subprogram is an
3473 -- Address. In order to reference the _object component
3476 -- type T is access p__ptTV;
3479 New_Itype := Create_Itype (E_Access_Type, N);
3480 Set_Etype (New_Itype, New_Itype);
3481 Set_Directly_Designated_Type (New_Itype,
3482 Corresponding_Record_Type (Conctyp));
3483 Freeze_Itype (New_Itype, N);
3486 -- T!(O)._object'unchecked_access
3489 Make_Attribute_Reference (Loc,
3491 Make_Selected_Component (Loc,
3493 Unchecked_Convert_To (New_Itype,
3496 (Protected_Body_Subprogram (Subprg)),
3499 Make_Identifier (Loc, Name_uObject)),
3500 Attribute_Name => Name_Unchecked_Access);
3503 -- Use of 'Priority inside a protected subprogram
3507 Make_Attribute_Reference (Loc,
3509 Make_Selected_Component (Loc,
3510 Prefix => New_Reference_To
3512 (Protected_Body_Subprogram (Subprg)),
3515 Make_Identifier (Loc, Name_uObject)),
3516 Attribute_Name => Name_Unchecked_Access);
3519 -- Select the appropriate run-time subprogram
3521 if Number_Entries (Conctyp) = 0 then
3523 New_Reference_To (RTE (RE_Get_Ceiling), Loc);
3526 New_Reference_To (RTE (RO_PE_Get_Ceiling), Loc);
3530 Make_Function_Call (Loc,
3531 Name => RT_Subprg_Name,
3532 Parameter_Associations => New_List (Object_Parm));
3536 -- Avoid the generation of extra checks on the pointer to the
3537 -- protected object.
3539 Analyze_And_Resolve (N, Typ, Suppress => Access_Check);
3546 when Attribute_Range_Length => Range_Length : begin
3547 -- The only special processing required is for the case where
3548 -- Range_Length is applied to an enumeration type with holes.
3549 -- In this case we transform
3555 -- X'Pos (X'Last) - X'Pos (X'First) + 1
3557 -- So that the result reflects the proper Pos values instead
3558 -- of the underlying representations.
3560 if Is_Enumeration_Type (Ptyp)
3561 and then Has_Non_Standard_Rep (Ptyp)
3566 Make_Op_Subtract (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_Last,
3574 Prefix => New_Occurrence_Of (Ptyp, Loc)))),
3577 Make_Attribute_Reference (Loc,
3578 Attribute_Name => Name_Pos,
3579 Prefix => New_Occurrence_Of (Ptyp, Loc),
3580 Expressions => New_List (
3581 Make_Attribute_Reference (Loc,
3582 Attribute_Name => Name_First,
3583 Prefix => New_Occurrence_Of (Ptyp, Loc))))),
3586 Make_Integer_Literal (Loc, 1)));
3588 Analyze_And_Resolve (N, Typ);
3590 -- For all other cases, the attribute is handled by the back end, but
3591 -- we need to deal with the case of the range check on a universal
3595 Apply_Universal_Integer_Attribute_Checks (N);
3603 when Attribute_Read => Read : declare
3604 P_Type : constant Entity_Id := Entity (Pref);
3605 B_Type : constant Entity_Id := Base_Type (P_Type);
3606 U_Type : constant Entity_Id := Underlying_Type (P_Type);
3616 -- If no underlying type, we have an error that will be diagnosed
3617 -- elsewhere, so here we just completely ignore the expansion.
3623 -- The simple case, if there is a TSS for Read, just call it
3625 Pname := Find_Stream_Subprogram (P_Type, TSS_Stream_Read);
3627 if Present (Pname) then
3631 -- If there is a Stream_Convert pragma, use it, we rewrite
3633 -- sourcetyp'Read (stream, Item)
3637 -- Item := sourcetyp (strmread (strmtyp'Input (Stream)));
3639 -- where strmread is the given Read function that converts an
3640 -- argument of type strmtyp to type sourcetyp or a type from which
3641 -- it is derived. The conversion to sourcetyp is required in the
3644 -- A special case arises if Item is a type conversion in which
3645 -- case, we have to expand to:
3647 -- Itemx := typex (strmread (strmtyp'Input (Stream)));
3649 -- where Itemx is the expression of the type conversion (i.e.
3650 -- the actual object), and typex is the type of Itemx.
3652 Prag := Get_Stream_Convert_Pragma (P_Type);
3654 if Present (Prag) then
3655 Arg2 := Next (First (Pragma_Argument_Associations (Prag)));
3656 Rfunc := Entity (Expression (Arg2));
3657 Lhs := Relocate_Node (Next (First (Exprs)));
3659 OK_Convert_To (B_Type,
3660 Make_Function_Call (Loc,
3661 Name => New_Occurrence_Of (Rfunc, Loc),
3662 Parameter_Associations => New_List (
3663 Make_Attribute_Reference (Loc,
3666 (Etype (First_Formal (Rfunc)), Loc),
3667 Attribute_Name => Name_Input,
3668 Expressions => New_List (
3669 Relocate_Node (First (Exprs)))))));
3671 if Nkind (Lhs) = N_Type_Conversion then
3672 Lhs := Expression (Lhs);
3673 Rhs := Convert_To (Etype (Lhs), Rhs);
3677 Make_Assignment_Statement (Loc,
3679 Expression => Rhs));
3680 Set_Assignment_OK (Lhs);
3684 -- For elementary types, we call the I_xxx routine using the first
3685 -- parameter and then assign the result into the second parameter.
3686 -- We set Assignment_OK to deal with the conversion case.
3688 elsif Is_Elementary_Type (U_Type) then
3694 Lhs := Relocate_Node (Next (First (Exprs)));
3695 Rhs := Build_Elementary_Input_Call (N);
3697 if Nkind (Lhs) = N_Type_Conversion then
3698 Lhs := Expression (Lhs);
3699 Rhs := Convert_To (Etype (Lhs), Rhs);
3702 Set_Assignment_OK (Lhs);
3705 Make_Assignment_Statement (Loc,
3707 Expression => Rhs));
3715 elsif Is_Array_Type (U_Type) then
3716 Build_Array_Read_Procedure (N, U_Type, Decl, Pname);
3717 Compile_Stream_Body_In_Scope (N, Decl, U_Type, Check => False);
3719 -- Tagged type case, use the primitive Read function. Note that
3720 -- this will dispatch in the class-wide case which is what we want
3722 elsif Is_Tagged_Type (U_Type) then
3723 Pname := Find_Prim_Op (U_Type, TSS_Stream_Read);
3725 -- All other record type cases, including protected records. The
3726 -- latter only arise for expander generated code for handling
3727 -- shared passive partition access.
3731 (Is_Record_Type (U_Type) or else Is_Protected_Type (U_Type));
3733 -- Ada 2005 (AI-216): Program_Error is raised when executing
3734 -- the default implementation of the Read attribute of an
3735 -- Unchecked_Union type.
3737 if Is_Unchecked_Union (Base_Type (U_Type)) then
3739 Make_Raise_Program_Error (Loc,
3740 Reason => PE_Unchecked_Union_Restriction));
3743 if Has_Discriminants (U_Type)
3745 (Discriminant_Default_Value (First_Discriminant (U_Type)))
3747 Build_Mutable_Record_Read_Procedure
3748 (Loc, Base_Type (U_Type), Decl, Pname);
3750 Build_Record_Read_Procedure
3751 (Loc, Base_Type (U_Type), Decl, Pname);
3754 -- Suppress checks, uninitialized or otherwise invalid
3755 -- data does not cause constraint errors to be raised for
3756 -- a complete record read.
3758 Insert_Action (N, Decl, All_Checks);
3762 Rewrite_Stream_Proc_Call (Pname);
3769 -- Transforms 'Remainder into a call to the floating-point attribute
3770 -- function Remainder in Fat_xxx (where xxx is the root type)
3772 when Attribute_Remainder =>
3773 Expand_Fpt_Attribute_RR (N);
3779 -- Transform 'Result into reference to _Result formal. At the point
3780 -- where a legal 'Result attribute is expanded, we know that we are in
3781 -- the context of a _Postcondition function with a _Result parameter.
3783 when Attribute_Result =>
3785 Make_Identifier (Loc,
3786 Chars => Name_uResult));
3787 Analyze_And_Resolve (N, Typ);
3793 -- The handling of the Round attribute is quite delicate. The processing
3794 -- in Sem_Attr introduced a conversion to universal real, reflecting the
3795 -- semantics of Round, but we do not want anything to do with universal
3796 -- real at runtime, since this corresponds to using floating-point
3799 -- What we have now is that the Etype of the Round attribute correctly
3800 -- indicates the final result type. The operand of the Round is the
3801 -- conversion to universal real, described above, and the operand of
3802 -- this conversion is the actual operand of Round, which may be the
3803 -- special case of a fixed point multiplication or division (Etype =
3806 -- The exapander will expand first the operand of the conversion, then
3807 -- the conversion, and finally the round attribute itself, since we
3808 -- always work inside out. But we cannot simply process naively in this
3809 -- order. In the semantic world where universal fixed and real really
3810 -- exist and have infinite precision, there is no problem, but in the
3811 -- implementation world, where universal real is a floating-point type,
3812 -- we would get the wrong result.
3814 -- So the approach is as follows. First, when expanding a multiply or
3815 -- divide whose type is universal fixed, we do nothing at all, instead
3816 -- deferring the operation till later.
3818 -- The actual processing is done in Expand_N_Type_Conversion which
3819 -- handles the special case of Round by looking at its parent to see if
3820 -- it is a Round attribute, and if it is, handling the conversion (or
3821 -- its fixed multiply/divide child) in an appropriate manner.
3823 -- This means that by the time we get to expanding the Round attribute
3824 -- itself, the Round is nothing more than a type conversion (and will
3825 -- often be a null type conversion), so we just replace it with the
3826 -- appropriate conversion operation.
3828 when Attribute_Round =>
3830 Convert_To (Etype (N), Relocate_Node (First (Exprs))));
3831 Analyze_And_Resolve (N);
3837 -- Transforms 'Rounding into a call to the floating-point attribute
3838 -- function Rounding in Fat_xxx (where xxx is the root type)
3840 when Attribute_Rounding =>
3841 Expand_Fpt_Attribute_R (N);
3847 -- Transforms 'Scaling into a call to the floating-point attribute
3848 -- function Scaling in Fat_xxx (where xxx is the root type)
3850 when Attribute_Scaling =>
3851 Expand_Fpt_Attribute_RI (N);
3857 when Attribute_Size |
3858 Attribute_Object_Size |
3859 Attribute_Value_Size |
3860 Attribute_VADS_Size => Size :
3867 -- Processing for VADS_Size case. Note that this processing removes
3868 -- all traces of VADS_Size from the tree, and completes all required
3869 -- processing for VADS_Size by translating the attribute reference
3870 -- to an appropriate Size or Object_Size reference.
3872 if Id = Attribute_VADS_Size
3873 or else (Use_VADS_Size and then Id = Attribute_Size)
3875 -- If the size is specified, then we simply use the specified
3876 -- size. This applies to both types and objects. The size of an
3877 -- object can be specified in the following ways:
3879 -- An explicit size object is given for an object
3880 -- A component size is specified for an indexed component
3881 -- A component clause is specified for a selected component
3882 -- The object is a component of a packed composite object
3884 -- If the size is specified, then VADS_Size of an object
3886 if (Is_Entity_Name (Pref)
3887 and then Present (Size_Clause (Entity (Pref))))
3889 (Nkind (Pref) = N_Component_Clause
3890 and then (Present (Component_Clause
3891 (Entity (Selector_Name (Pref))))
3892 or else Is_Packed (Etype (Prefix (Pref)))))
3894 (Nkind (Pref) = N_Indexed_Component
3895 and then (Component_Size (Etype (Prefix (Pref))) /= 0
3896 or else Is_Packed (Etype (Prefix (Pref)))))
3898 Set_Attribute_Name (N, Name_Size);
3900 -- Otherwise if we have an object rather than a type, then the
3901 -- VADS_Size attribute applies to the type of the object, rather
3902 -- than the object itself. This is one of the respects in which
3903 -- VADS_Size differs from Size.
3906 if (not Is_Entity_Name (Pref)
3907 or else not Is_Type (Entity (Pref)))
3908 and then (Is_Scalar_Type (Ptyp) or else Is_Constrained (Ptyp))
3910 Rewrite (Pref, New_Occurrence_Of (Ptyp, Loc));
3913 -- For a scalar type for which no size was explicitly given,
3914 -- VADS_Size means Object_Size. This is the other respect in
3915 -- which VADS_Size differs from Size.
3917 if Is_Scalar_Type (Ptyp) and then No (Size_Clause (Ptyp)) then
3918 Set_Attribute_Name (N, Name_Object_Size);
3920 -- In all other cases, Size and VADS_Size are the sane
3923 Set_Attribute_Name (N, Name_Size);
3928 -- For class-wide types, X'Class'Size is transformed into a direct
3929 -- reference to the Size of the class type, so that the back end does
3930 -- not have to deal with the X'Class'Size reference.
3932 if Is_Entity_Name (Pref)
3933 and then Is_Class_Wide_Type (Entity (Pref))
3935 Rewrite (Prefix (N), New_Occurrence_Of (Entity (Pref), Loc));
3938 -- For X'Size applied to an object of a class-wide type, transform
3939 -- X'Size into a call to the primitive operation _Size applied to X.
3941 elsif Is_Class_Wide_Type (Ptyp)
3942 or else (Id = Attribute_Size
3943 and then Is_Tagged_Type (Ptyp)
3944 and then Has_Unknown_Discriminants (Ptyp))
3946 -- No need to do anything else compiling under restriction
3947 -- No_Dispatching_Calls. During the semantic analysis we
3948 -- already notified such violation.
3950 if Restriction_Active (No_Dispatching_Calls) then
3955 Make_Function_Call (Loc,
3956 Name => New_Reference_To
3957 (Find_Prim_Op (Ptyp, Name_uSize), Loc),
3958 Parameter_Associations => New_List (Pref));
3960 if Typ /= Standard_Long_Long_Integer then
3962 -- The context is a specific integer type with which the
3963 -- original attribute was compatible. The function has a
3964 -- specific type as well, so to preserve the compatibility
3965 -- we must convert explicitly.
3967 New_Node := Convert_To (Typ, New_Node);
3970 Rewrite (N, New_Node);
3971 Analyze_And_Resolve (N, Typ);
3974 -- Case of known RM_Size of a type
3976 elsif (Id = Attribute_Size or else Id = Attribute_Value_Size)
3977 and then Is_Entity_Name (Pref)
3978 and then Is_Type (Entity (Pref))
3979 and then Known_Static_RM_Size (Entity (Pref))
3981 Siz := RM_Size (Entity (Pref));
3983 -- Case of known Esize of a type
3985 elsif Id = Attribute_Object_Size
3986 and then Is_Entity_Name (Pref)
3987 and then Is_Type (Entity (Pref))
3988 and then Known_Static_Esize (Entity (Pref))
3990 Siz := Esize (Entity (Pref));
3992 -- Case of known size of object
3994 elsif Id = Attribute_Size
3995 and then Is_Entity_Name (Pref)
3996 and then Is_Object (Entity (Pref))
3997 and then Known_Esize (Entity (Pref))
3998 and then Known_Static_Esize (Entity (Pref))
4000 Siz := Esize (Entity (Pref));
4002 -- For an array component, we can do Size in the front end
4003 -- if the component_size of the array is set.
4005 elsif Nkind (Pref) = N_Indexed_Component then
4006 Siz := Component_Size (Etype (Prefix (Pref)));
4008 -- For a record component, we can do Size in the front end if there
4009 -- is a component clause, or if the record is packed and the
4010 -- component's size is known at compile time.
4012 elsif Nkind (Pref) = N_Selected_Component then
4014 Rec : constant Entity_Id := Etype (Prefix (Pref));
4015 Comp : constant Entity_Id := Entity (Selector_Name (Pref));
4018 if Present (Component_Clause (Comp)) then
4019 Siz := Esize (Comp);
4021 elsif Is_Packed (Rec) then
4022 Siz := RM_Size (Ptyp);
4025 Apply_Universal_Integer_Attribute_Checks (N);
4030 -- All other cases are handled by the back end
4033 Apply_Universal_Integer_Attribute_Checks (N);
4035 -- If Size is applied to a formal parameter that is of a packed
4036 -- array subtype, then apply Size to the actual subtype.
4038 if Is_Entity_Name (Pref)
4039 and then Is_Formal (Entity (Pref))
4040 and then Is_Array_Type (Ptyp)
4041 and then Is_Packed (Ptyp)
4044 Make_Attribute_Reference (Loc,
4046 New_Occurrence_Of (Get_Actual_Subtype (Pref), Loc),
4047 Attribute_Name => Name_Size));
4048 Analyze_And_Resolve (N, Typ);
4051 -- If Size applies to a dereference of an access to unconstrained
4052 -- packed array, the back end needs to see its unconstrained
4053 -- nominal type, but also a hint to the actual constrained type.
4055 if Nkind (Pref) = N_Explicit_Dereference
4056 and then Is_Array_Type (Ptyp)
4057 and then not Is_Constrained (Ptyp)
4058 and then Is_Packed (Ptyp)
4060 Set_Actual_Designated_Subtype (Pref,
4061 Get_Actual_Subtype (Pref));
4067 -- Common processing for record and array component case
4069 if Siz /= No_Uint and then Siz /= 0 then
4071 CS : constant Boolean := Comes_From_Source (N);
4074 Rewrite (N, Make_Integer_Literal (Loc, Siz));
4076 -- This integer literal is not a static expression. We do not
4077 -- call Analyze_And_Resolve here, because this would activate
4078 -- the circuit for deciding that a static value was out of
4079 -- range, and we don't want that.
4081 -- So just manually set the type, mark the expression as non-
4082 -- static, and then ensure that the result is checked properly
4083 -- if the attribute comes from source (if it was internally
4084 -- generated, we never need a constraint check).
4087 Set_Is_Static_Expression (N, False);
4090 Apply_Constraint_Check (N, Typ);
4100 when Attribute_Storage_Pool =>
4102 Make_Type_Conversion (Loc,
4103 Subtype_Mark => New_Reference_To (Etype (N), Loc),
4104 Expression => New_Reference_To (Entity (N), Loc)));
4105 Analyze_And_Resolve (N, Typ);
4111 when Attribute_Storage_Size => Storage_Size : begin
4113 -- Access type case, always go to the root type
4115 -- The case of access types results in a value of zero for the case
4116 -- where no storage size attribute clause has been given. If a
4117 -- storage size has been given, then the attribute is converted
4118 -- to a reference to the variable used to hold this value.
4120 if Is_Access_Type (Ptyp) then
4121 if Present (Storage_Size_Variable (Root_Type (Ptyp))) then
4123 Make_Attribute_Reference (Loc,
4124 Prefix => New_Reference_To (Typ, Loc),
4125 Attribute_Name => Name_Max,
4126 Expressions => New_List (
4127 Make_Integer_Literal (Loc, 0),
4130 (Storage_Size_Variable (Root_Type (Ptyp)), Loc)))));
4132 elsif Present (Associated_Storage_Pool (Root_Type (Ptyp))) then
4135 Make_Function_Call (Loc,
4139 (Etype (Associated_Storage_Pool (Root_Type (Ptyp))),
4140 Attribute_Name (N)),
4143 Parameter_Associations => New_List (
4145 (Associated_Storage_Pool (Root_Type (Ptyp)), Loc)))));
4148 Rewrite (N, Make_Integer_Literal (Loc, 0));
4151 Analyze_And_Resolve (N, Typ);
4153 -- For tasks, we retrieve the size directly from the TCB. The
4154 -- size may depend on a discriminant of the type, and therefore
4155 -- can be a per-object expression, so type-level information is
4156 -- not sufficient in general. There are four cases to consider:
4158 -- a) If the attribute appears within a task body, the designated
4159 -- TCB is obtained by a call to Self.
4161 -- b) If the prefix of the attribute is the name of a task object,
4162 -- the designated TCB is the one stored in the corresponding record.
4164 -- c) If the prefix is a task type, the size is obtained from the
4165 -- size variable created for each task type
4167 -- d) If no storage_size was specified for the type , there is no
4168 -- size variable, and the value is a system-specific default.
4171 if In_Open_Scopes (Ptyp) then
4173 -- Storage_Size (Self)
4177 Make_Function_Call (Loc,
4179 New_Occurrence_Of (RTE (RE_Storage_Size), Loc),
4180 Parameter_Associations =>
4182 Make_Function_Call (Loc,
4184 New_Reference_To (RTE (RE_Self), Loc))))));
4186 elsif not Is_Entity_Name (Pref)
4187 or else not Is_Type (Entity (Pref))
4189 -- Storage_Size (Rec (Obj).Size)
4193 Make_Function_Call (Loc,
4195 New_Occurrence_Of (RTE (RE_Storage_Size), Loc),
4196 Parameter_Associations =>
4198 Make_Selected_Component (Loc,
4200 Unchecked_Convert_To (
4201 Corresponding_Record_Type (Ptyp),
4202 New_Copy_Tree (Pref)),
4204 Make_Identifier (Loc, Name_uTask_Id))))));
4206 elsif Present (Storage_Size_Variable (Ptyp)) then
4208 -- Static storage size pragma given for type: retrieve value
4209 -- from its allocated storage variable.
4213 Make_Function_Call (Loc,
4214 Name => New_Occurrence_Of (
4215 RTE (RE_Adjust_Storage_Size), Loc),
4216 Parameter_Associations =>
4219 Storage_Size_Variable (Ptyp), Loc)))));
4221 -- Get system default
4225 Make_Function_Call (Loc,
4228 RTE (RE_Default_Stack_Size), Loc))));
4231 Analyze_And_Resolve (N, Typ);
4239 when Attribute_Stream_Size => Stream_Size : declare
4243 -- If we have a Stream_Size clause for this type use it, otherwise
4244 -- the Stream_Size if the size of the type.
4246 if Has_Stream_Size_Clause (Ptyp) then
4249 (Static_Integer (Expression (Stream_Size_Clause (Ptyp))));
4251 Size := UI_To_Int (Esize (Ptyp));
4254 Rewrite (N, Make_Integer_Literal (Loc, Intval => Size));
4255 Analyze_And_Resolve (N, Typ);
4262 -- 1. Deal with enumeration types with holes
4263 -- 2. For floating-point, generate call to attribute function
4264 -- 3. For other cases, deal with constraint checking
4266 when Attribute_Succ => Succ :
4268 Etyp : constant Entity_Id := Base_Type (Ptyp);
4272 -- For enumeration types with non-standard representations, we
4273 -- expand typ'Succ (x) into
4275 -- Pos_To_Rep (Rep_To_Pos (x) + 1)
4277 -- If the representation is contiguous, we compute instead
4278 -- Lit1 + Rep_to_Pos (x+1), to catch invalid representations.
4280 if Is_Enumeration_Type (Ptyp)
4281 and then Present (Enum_Pos_To_Rep (Etyp))
4283 if Has_Contiguous_Rep (Etyp) then
4285 Unchecked_Convert_To (Ptyp,
4288 Make_Integer_Literal (Loc,
4289 Enumeration_Rep (First_Literal (Ptyp))),
4291 Make_Function_Call (Loc,
4294 (TSS (Etyp, TSS_Rep_To_Pos), Loc),
4296 Parameter_Associations =>
4298 Unchecked_Convert_To (Ptyp,
4301 Unchecked_Convert_To (Standard_Integer,
4302 Relocate_Node (First (Exprs))),
4304 Make_Integer_Literal (Loc, 1))),
4305 Rep_To_Pos_Flag (Ptyp, Loc))))));
4307 -- Add Boolean parameter True, to request program errror if
4308 -- we have a bad representation on our hands. Add False if
4309 -- checks are suppressed.
4311 Append_To (Exprs, Rep_To_Pos_Flag (Ptyp, Loc));
4313 Make_Indexed_Component (Loc,
4316 (Enum_Pos_To_Rep (Etyp), Loc),
4317 Expressions => New_List (
4320 Make_Function_Call (Loc,
4323 (TSS (Etyp, TSS_Rep_To_Pos), Loc),
4324 Parameter_Associations => Exprs),
4325 Right_Opnd => Make_Integer_Literal (Loc, 1)))));
4328 Analyze_And_Resolve (N, Typ);
4330 -- For floating-point, we transform 'Succ into a call to the Succ
4331 -- floating-point attribute function in Fat_xxx (xxx is root type)
4333 elsif Is_Floating_Point_Type (Ptyp) then
4334 Expand_Fpt_Attribute_R (N);
4335 Analyze_And_Resolve (N, Typ);
4337 -- For modular types, nothing to do (no overflow, since wraps)
4339 elsif Is_Modular_Integer_Type (Ptyp) then
4342 -- For other types, if argument is marked as needing a range check or
4343 -- overflow checking is enabled, we must generate a check.
4345 elsif not Overflow_Checks_Suppressed (Ptyp)
4346 or else Do_Range_Check (First (Exprs))
4348 Set_Do_Range_Check (First (Exprs), False);
4349 Expand_Pred_Succ (N);
4357 -- Transforms X'Tag into a direct reference to the tag of X
4359 when Attribute_Tag => Tag :
4362 Prefix_Is_Type : Boolean;
4365 if Is_Entity_Name (Pref) and then Is_Type (Entity (Pref)) then
4366 Ttyp := Entity (Pref);
4367 Prefix_Is_Type := True;
4370 Prefix_Is_Type := False;
4373 if Is_Class_Wide_Type (Ttyp) then
4374 Ttyp := Root_Type (Ttyp);
4377 Ttyp := Underlying_Type (Ttyp);
4379 -- Ada 2005: The type may be a synchronized tagged type, in which
4380 -- case the tag information is stored in the corresponding record.
4382 if Is_Concurrent_Type (Ttyp) then
4383 Ttyp := Corresponding_Record_Type (Ttyp);
4386 if Prefix_Is_Type then
4388 -- For VMs we leave the type attribute unexpanded because
4389 -- there's not a dispatching table to reference.
4391 if Tagged_Type_Expansion then
4393 Unchecked_Convert_To (RTE (RE_Tag),
4395 (Node (First_Elmt (Access_Disp_Table (Ttyp))), Loc)));
4396 Analyze_And_Resolve (N, RTE (RE_Tag));
4399 -- Ada 2005 (AI-251): The use of 'Tag in the sources always
4400 -- references the primary tag of the actual object. If 'Tag is
4401 -- applied to class-wide interface objects we generate code that
4402 -- displaces "this" to reference the base of the object.
4404 elsif Comes_From_Source (N)
4405 and then Is_Class_Wide_Type (Etype (Prefix (N)))
4406 and then Is_Interface (Etype (Prefix (N)))
4409 -- (To_Tag_Ptr (Prefix'Address)).all
4411 -- Note that Prefix'Address is recursively expanded into a call
4412 -- to Base_Address (Obj.Tag)
4414 -- Not needed for VM targets, since all handled by the VM
4416 if Tagged_Type_Expansion then
4418 Make_Explicit_Dereference (Loc,
4419 Unchecked_Convert_To (RTE (RE_Tag_Ptr),
4420 Make_Attribute_Reference (Loc,
4421 Prefix => Relocate_Node (Pref),
4422 Attribute_Name => Name_Address))));
4423 Analyze_And_Resolve (N, RTE (RE_Tag));
4428 Make_Selected_Component (Loc,
4429 Prefix => Relocate_Node (Pref),
4431 New_Reference_To (First_Tag_Component (Ttyp), Loc)));
4432 Analyze_And_Resolve (N, RTE (RE_Tag));
4440 -- Transforms 'Terminated attribute into a call to Terminated function
4442 when Attribute_Terminated => Terminated :
4444 -- The prefix of Terminated is of a task interface class-wide type.
4446 -- terminated (Task_Id (Pref._disp_get_task_id));
4448 if Ada_Version >= Ada_05
4449 and then Ekind (Ptyp) = E_Class_Wide_Type
4450 and then Is_Interface (Ptyp)
4451 and then Is_Task_Interface (Ptyp)
4454 Make_Function_Call (Loc,
4456 New_Reference_To (RTE (RE_Terminated), Loc),
4457 Parameter_Associations => New_List (
4458 Make_Unchecked_Type_Conversion (Loc,
4460 New_Reference_To (RTE (RO_ST_Task_Id), Loc),
4462 Make_Selected_Component (Loc,
4464 New_Copy_Tree (Pref),
4466 Make_Identifier (Loc, Name_uDisp_Get_Task_Id))))));
4468 elsif Restricted_Profile then
4470 Build_Call_With_Task (Pref, RTE (RE_Restricted_Terminated)));
4474 Build_Call_With_Task (Pref, RTE (RE_Terminated)));
4477 Analyze_And_Resolve (N, Standard_Boolean);
4484 -- Transforms System'To_Address (X) into unchecked conversion
4485 -- from (integral) type of X to type address.
4487 when Attribute_To_Address =>
4489 Unchecked_Convert_To (RTE (RE_Address),
4490 Relocate_Node (First (Exprs))));
4491 Analyze_And_Resolve (N, RTE (RE_Address));
4497 when Attribute_To_Any => To_Any : declare
4498 P_Type : constant Entity_Id := Etype (Pref);
4499 Decls : constant List_Id := New_List;
4503 (Convert_To (P_Type,
4504 Relocate_Node (First (Exprs))), Decls));
4505 Insert_Actions (N, Decls);
4506 Analyze_And_Resolve (N, RTE (RE_Any));
4513 -- Transforms 'Truncation into a call to the floating-point attribute
4514 -- function Truncation in Fat_xxx (where xxx is the root type).
4515 -- Expansion is avoided for cases the back end can handle directly.
4517 when Attribute_Truncation =>
4518 if not Is_Inline_Floating_Point_Attribute (N) then
4519 Expand_Fpt_Attribute_R (N);
4526 when Attribute_TypeCode => TypeCode : declare
4527 P_Type : constant Entity_Id := Etype (Pref);
4528 Decls : constant List_Id := New_List;
4530 Rewrite (N, Build_TypeCode_Call (Loc, P_Type, Decls));
4531 Insert_Actions (N, Decls);
4532 Analyze_And_Resolve (N, RTE (RE_TypeCode));
4535 -----------------------
4536 -- Unbiased_Rounding --
4537 -----------------------
4539 -- Transforms 'Unbiased_Rounding into a call to the floating-point
4540 -- attribute function Unbiased_Rounding in Fat_xxx (where xxx is the
4541 -- root type). Expansion is avoided for cases the back end can handle
4544 when Attribute_Unbiased_Rounding =>
4545 if not Is_Inline_Floating_Point_Attribute (N) then
4546 Expand_Fpt_Attribute_R (N);
4553 when Attribute_UET_Address => UET_Address : declare
4554 Ent : constant Entity_Id :=
4555 Make_Defining_Identifier (Loc, New_Internal_Name ('T'));
4559 Make_Object_Declaration (Loc,
4560 Defining_Identifier => Ent,
4561 Aliased_Present => True,
4562 Object_Definition =>
4563 New_Occurrence_Of (RTE (RE_Address), Loc)));
4565 -- Construct name __gnat_xxx__SDP, where xxx is the unit name
4566 -- in normal external form.
4568 Get_External_Unit_Name_String (Get_Unit_Name (Pref));
4569 Name_Buffer (1 + 7 .. Name_Len + 7) := Name_Buffer (1 .. Name_Len);
4570 Name_Len := Name_Len + 7;
4571 Name_Buffer (1 .. 7) := "__gnat_";
4572 Name_Buffer (Name_Len + 1 .. Name_Len + 5) := "__SDP";
4573 Name_Len := Name_Len + 5;
4575 Set_Is_Imported (Ent);
4576 Set_Interface_Name (Ent,
4577 Make_String_Literal (Loc,
4578 Strval => String_From_Name_Buffer));
4580 -- Set entity as internal to ensure proper Sprint output of its
4581 -- implicit importation.
4583 Set_Is_Internal (Ent);
4586 Make_Attribute_Reference (Loc,
4587 Prefix => New_Occurrence_Of (Ent, Loc),
4588 Attribute_Name => Name_Address));
4590 Analyze_And_Resolve (N, Typ);
4597 -- The processing for VADS_Size is shared with Size
4603 -- For enumeration types with a standard representation, and for all
4604 -- other types, Val is handled by the back end. For enumeration types
4605 -- with a non-standard representation we use the _Pos_To_Rep array that
4606 -- was created when the type was frozen.
4608 when Attribute_Val => Val :
4610 Etyp : constant Entity_Id := Base_Type (Entity (Pref));
4613 if Is_Enumeration_Type (Etyp)
4614 and then Present (Enum_Pos_To_Rep (Etyp))
4616 if Has_Contiguous_Rep (Etyp) then
4618 Rep_Node : constant Node_Id :=
4619 Unchecked_Convert_To (Etyp,
4622 Make_Integer_Literal (Loc,
4623 Enumeration_Rep (First_Literal (Etyp))),
4625 (Convert_To (Standard_Integer,
4626 Relocate_Node (First (Exprs))))));
4630 Unchecked_Convert_To (Etyp,
4633 Make_Integer_Literal (Loc,
4634 Enumeration_Rep (First_Literal (Etyp))),
4636 Make_Function_Call (Loc,
4639 (TSS (Etyp, TSS_Rep_To_Pos), Loc),
4640 Parameter_Associations => New_List (
4642 Rep_To_Pos_Flag (Etyp, Loc))))));
4647 Make_Indexed_Component (Loc,
4648 Prefix => New_Reference_To (Enum_Pos_To_Rep (Etyp), Loc),
4649 Expressions => New_List (
4650 Convert_To (Standard_Integer,
4651 Relocate_Node (First (Exprs))))));
4654 Analyze_And_Resolve (N, Typ);
4656 -- If the argument is marked as requiring a range check then generate
4659 elsif Do_Range_Check (First (Exprs)) then
4660 Set_Do_Range_Check (First (Exprs), False);
4661 Generate_Range_Check (First (Exprs), Etyp, CE_Range_Check_Failed);
4669 -- The code for valid is dependent on the particular types involved.
4670 -- See separate sections below for the generated code in each case.
4672 when Attribute_Valid => Valid :
4674 Btyp : Entity_Id := Base_Type (Ptyp);
4677 Save_Validity_Checks_On : constant Boolean := Validity_Checks_On;
4678 -- Save the validity checking mode. We always turn off validity
4679 -- checking during process of 'Valid since this is one place
4680 -- where we do not want the implicit validity checks to intefere
4681 -- with the explicit validity check that the programmer is doing.
4683 function Make_Range_Test return Node_Id;
4684 -- Build the code for a range test of the form
4685 -- Btyp!(Pref) >= Btyp!(Ptyp'First)
4687 -- Btyp!(Pref) <= Btyp!(Ptyp'Last)
4689 ---------------------
4690 -- Make_Range_Test --
4691 ---------------------
4693 function Make_Range_Test return Node_Id is
4694 Temp : constant Node_Id := Duplicate_Subexpr (Pref);
4697 -- The value whose validity is being checked has been captured in
4698 -- an object declaration. We certainly don't want this object to
4699 -- appear valid because the declaration initializes it!
4701 if Is_Entity_Name (Temp) then
4702 Set_Is_Known_Valid (Entity (Temp), False);
4710 Unchecked_Convert_To (Btyp, Temp),
4713 Unchecked_Convert_To (Btyp,
4714 Make_Attribute_Reference (Loc,
4715 Prefix => New_Occurrence_Of (Ptyp, Loc),
4716 Attribute_Name => Name_First))),
4721 Unchecked_Convert_To (Btyp, Temp),
4724 Unchecked_Convert_To (Btyp,
4725 Make_Attribute_Reference (Loc,
4726 Prefix => New_Occurrence_Of (Ptyp, Loc),
4727 Attribute_Name => Name_Last))));
4728 end Make_Range_Test;
4730 -- Start of processing for Attribute_Valid
4733 -- Turn off validity checks. We do not want any implicit validity
4734 -- checks to intefere with the explicit check from the attribute
4736 Validity_Checks_On := False;
4738 -- Floating-point case. This case is handled by the Valid attribute
4739 -- code in the floating-point attribute run-time library.
4741 if Is_Floating_Point_Type (Ptyp) then
4747 -- For vax fpt types, call appropriate routine in special vax
4748 -- floating point unit. We do not have to worry about loads in
4749 -- this case, since these types have no signalling NaN's.
4751 if Vax_Float (Btyp) then
4752 Expand_Vax_Valid (N);
4754 -- The AAMP back end handles Valid for floating-point types
4756 elsif Is_AAMP_Float (Btyp) then
4757 Analyze_And_Resolve (Pref, Ptyp);
4758 Set_Etype (N, Standard_Boolean);
4761 -- Non VAX float case
4764 Find_Fat_Info (Ptyp, Ftp, Pkg);
4766 -- If the floating-point object might be unaligned, we need
4767 -- to call the special routine Unaligned_Valid, which makes
4768 -- the needed copy, being careful not to load the value into
4769 -- any floating-point register. The argument in this case is
4770 -- obj'Address (see Unaligned_Valid routine in Fat_Gen).
4772 if Is_Possibly_Unaligned_Object (Pref) then
4773 Expand_Fpt_Attribute
4774 (N, Pkg, Name_Unaligned_Valid,
4776 Make_Attribute_Reference (Loc,
4777 Prefix => Relocate_Node (Pref),
4778 Attribute_Name => Name_Address)));
4780 -- In the normal case where we are sure the object is
4781 -- aligned, we generate a call to Valid, and the argument in
4782 -- this case is obj'Unrestricted_Access (after converting
4783 -- obj to the right floating-point type).
4786 Expand_Fpt_Attribute
4787 (N, Pkg, Name_Valid,
4789 Make_Attribute_Reference (Loc,
4790 Prefix => Unchecked_Convert_To (Ftp, Pref),
4791 Attribute_Name => Name_Unrestricted_Access)));
4795 -- One more task, we still need a range check. Required
4796 -- only if we have a constraint, since the Valid routine
4797 -- catches infinities properly (infinities are never valid).
4799 -- The way we do the range check is simply to create the
4800 -- expression: Valid (N) and then Base_Type(Pref) in Typ.
4802 if not Subtypes_Statically_Match (Ptyp, Btyp) then
4805 Left_Opnd => Relocate_Node (N),
4808 Left_Opnd => Convert_To (Btyp, Pref),
4809 Right_Opnd => New_Occurrence_Of (Ptyp, Loc))));
4813 -- Enumeration type with holes
4815 -- For enumeration types with holes, the Pos value constructed by
4816 -- the Enum_Rep_To_Pos function built in Exp_Ch3 called with a
4817 -- second argument of False returns minus one for an invalid value,
4818 -- and the non-negative pos value for a valid value, so the
4819 -- expansion of X'Valid is simply:
4821 -- type(X)'Pos (X) >= 0
4823 -- We can't quite generate it that way because of the requirement
4824 -- for the non-standard second argument of False in the resulting
4825 -- rep_to_pos call, so we have to explicitly create:
4827 -- _rep_to_pos (X, False) >= 0
4829 -- If we have an enumeration subtype, we also check that the
4830 -- value is in range:
4832 -- _rep_to_pos (X, False) >= 0
4834 -- (X >= type(X)'First and then type(X)'Last <= X)
4836 elsif Is_Enumeration_Type (Ptyp)
4837 and then Present (Enum_Pos_To_Rep (Base_Type (Ptyp)))
4842 Make_Function_Call (Loc,
4845 (TSS (Base_Type (Ptyp), TSS_Rep_To_Pos), Loc),
4846 Parameter_Associations => New_List (
4848 New_Occurrence_Of (Standard_False, Loc))),
4849 Right_Opnd => Make_Integer_Literal (Loc, 0));
4853 (Type_Low_Bound (Ptyp) /= Type_Low_Bound (Btyp)
4855 Type_High_Bound (Ptyp) /= Type_High_Bound (Btyp))
4857 -- The call to Make_Range_Test will create declarations
4858 -- that need a proper insertion point, but Pref is now
4859 -- attached to a node with no ancestor. Attach to tree
4860 -- even if it is to be rewritten below.
4862 Set_Parent (Tst, Parent (N));
4866 Left_Opnd => Make_Range_Test,
4872 -- Fortran convention booleans
4874 -- For the very special case of Fortran convention booleans, the
4875 -- value is always valid, since it is an integer with the semantics
4876 -- that non-zero is true, and any value is permissible.
4878 elsif Is_Boolean_Type (Ptyp)
4879 and then Convention (Ptyp) = Convention_Fortran
4881 Rewrite (N, New_Occurrence_Of (Standard_True, Loc));
4883 -- For biased representations, we will be doing an unchecked
4884 -- conversion without unbiasing the result. That means that the range
4885 -- test has to take this into account, and the proper form of the
4888 -- Btyp!(Pref) < Btyp!(Ptyp'Range_Length)
4890 elsif Has_Biased_Representation (Ptyp) then
4891 Btyp := RTE (RE_Unsigned_32);
4895 Unchecked_Convert_To (Btyp, Duplicate_Subexpr (Pref)),
4897 Unchecked_Convert_To (Btyp,
4898 Make_Attribute_Reference (Loc,
4899 Prefix => New_Occurrence_Of (Ptyp, Loc),
4900 Attribute_Name => Name_Range_Length))));
4902 -- For all other scalar types, what we want logically is a
4905 -- X in type(X)'First .. type(X)'Last
4907 -- But that's precisely what won't work because of possible
4908 -- unwanted optimization (and indeed the basic motivation for
4909 -- the Valid attribute is exactly that this test does not work!)
4910 -- What will work is:
4912 -- Btyp!(X) >= Btyp!(type(X)'First)
4914 -- Btyp!(X) <= Btyp!(type(X)'Last)
4916 -- where Btyp is an integer type large enough to cover the full
4917 -- range of possible stored values (i.e. it is chosen on the basis
4918 -- of the size of the type, not the range of the values). We write
4919 -- this as two tests, rather than a range check, so that static
4920 -- evaluation will easily remove either or both of the checks if
4921 -- they can be -statically determined to be true (this happens
4922 -- when the type of X is static and the range extends to the full
4923 -- range of stored values).
4925 -- Unsigned types. Note: it is safe to consider only whether the
4926 -- subtype is unsigned, since we will in that case be doing all
4927 -- unsigned comparisons based on the subtype range. Since we use the
4928 -- actual subtype object size, this is appropriate.
4930 -- For example, if we have
4932 -- subtype x is integer range 1 .. 200;
4933 -- for x'Object_Size use 8;
4935 -- Now the base type is signed, but objects of this type are bits
4936 -- unsigned, and doing an unsigned test of the range 1 to 200 is
4937 -- correct, even though a value greater than 127 looks signed to a
4938 -- signed comparison.
4940 elsif Is_Unsigned_Type (Ptyp) then
4941 if Esize (Ptyp) <= 32 then
4942 Btyp := RTE (RE_Unsigned_32);
4944 Btyp := RTE (RE_Unsigned_64);
4947 Rewrite (N, Make_Range_Test);
4952 if Esize (Ptyp) <= Esize (Standard_Integer) then
4953 Btyp := Standard_Integer;
4955 Btyp := Universal_Integer;
4958 Rewrite (N, Make_Range_Test);
4961 Analyze_And_Resolve (N, Standard_Boolean);
4962 Validity_Checks_On := Save_Validity_Checks_On;
4969 -- Value attribute is handled in separate unti Exp_Imgv
4971 when Attribute_Value =>
4972 Exp_Imgv.Expand_Value_Attribute (N);
4978 -- The processing for Value_Size shares the processing for Size
4984 -- The processing for Version shares the processing for Body_Version
4990 -- Wide_Image attribute is handled in separate unit Exp_Imgv
4992 when Attribute_Wide_Image =>
4993 Exp_Imgv.Expand_Wide_Image_Attribute (N);
4995 ---------------------
4996 -- Wide_Wide_Image --
4997 ---------------------
4999 -- Wide_Wide_Image attribute is handled in separate unit Exp_Imgv
5001 when Attribute_Wide_Wide_Image =>
5002 Exp_Imgv.Expand_Wide_Wide_Image_Attribute (N);
5008 -- We expand typ'Wide_Value (X) into
5011 -- (Wide_String_To_String (X, Wide_Character_Encoding_Method))
5013 -- Wide_String_To_String is a runtime function that converts its wide
5014 -- string argument to String, converting any non-translatable characters
5015 -- into appropriate escape sequences. This preserves the required
5016 -- semantics of Wide_Value in all cases, and results in a very simple
5017 -- implementation approach.
5019 -- Note: for this approach to be fully standard compliant for the cases
5020 -- where typ is Wide_Character and Wide_Wide_Character, the encoding
5021 -- method must cover the entire character range (e.g. UTF-8). But that
5022 -- is a reasonable requirement when dealing with encoded character
5023 -- sequences. Presumably if one of the restrictive encoding mechanisms
5024 -- is in use such as Shift-JIS, then characters that cannot be
5025 -- represented using this encoding will not appear in any case.
5027 when Attribute_Wide_Value => Wide_Value :
5030 Make_Attribute_Reference (Loc,
5032 Attribute_Name => Name_Value,
5034 Expressions => New_List (
5035 Make_Function_Call (Loc,
5037 New_Reference_To (RTE (RE_Wide_String_To_String), Loc),
5039 Parameter_Associations => New_List (
5040 Relocate_Node (First (Exprs)),
5041 Make_Integer_Literal (Loc,
5042 Intval => Int (Wide_Character_Encoding_Method)))))));
5044 Analyze_And_Resolve (N, Typ);
5047 ---------------------
5048 -- Wide_Wide_Value --
5049 ---------------------
5051 -- We expand typ'Wide_Value_Value (X) into
5054 -- (Wide_Wide_String_To_String (X, Wide_Character_Encoding_Method))
5056 -- Wide_Wide_String_To_String is a runtime function that converts its
5057 -- wide string argument to String, converting any non-translatable
5058 -- characters into appropriate escape sequences. This preserves the
5059 -- required semantics of Wide_Wide_Value in all cases, and results in a
5060 -- very simple implementation approach.
5062 -- It's not quite right where typ = Wide_Wide_Character, because the
5063 -- encoding method may not cover the whole character type ???
5065 when Attribute_Wide_Wide_Value => Wide_Wide_Value :
5068 Make_Attribute_Reference (Loc,
5070 Attribute_Name => Name_Value,
5072 Expressions => New_List (
5073 Make_Function_Call (Loc,
5075 New_Reference_To (RTE (RE_Wide_Wide_String_To_String), Loc),
5077 Parameter_Associations => New_List (
5078 Relocate_Node (First (Exprs)),
5079 Make_Integer_Literal (Loc,
5080 Intval => Int (Wide_Character_Encoding_Method)))))));
5082 Analyze_And_Resolve (N, Typ);
5083 end Wide_Wide_Value;
5085 ---------------------
5086 -- Wide_Wide_Width --
5087 ---------------------
5089 -- Wide_Wide_Width attribute is handled in separate unit Exp_Imgv
5091 when Attribute_Wide_Wide_Width =>
5092 Exp_Imgv.Expand_Width_Attribute (N, Wide_Wide);
5098 -- Wide_Width attribute is handled in separate unit Exp_Imgv
5100 when Attribute_Wide_Width =>
5101 Exp_Imgv.Expand_Width_Attribute (N, Wide);
5107 -- Width attribute is handled in separate unit Exp_Imgv
5109 when Attribute_Width =>
5110 Exp_Imgv.Expand_Width_Attribute (N, Normal);
5116 when Attribute_Write => Write : declare
5117 P_Type : constant Entity_Id := Entity (Pref);
5118 U_Type : constant Entity_Id := Underlying_Type (P_Type);
5126 -- If no underlying type, we have an error that will be diagnosed
5127 -- elsewhere, so here we just completely ignore the expansion.
5133 -- The simple case, if there is a TSS for Write, just call it
5135 Pname := Find_Stream_Subprogram (P_Type, TSS_Stream_Write);
5137 if Present (Pname) then
5141 -- If there is a Stream_Convert pragma, use it, we rewrite
5143 -- sourcetyp'Output (stream, Item)
5147 -- strmtyp'Output (Stream, strmwrite (acttyp (Item)));
5149 -- where strmwrite is the given Write function that converts an
5150 -- argument of type sourcetyp or a type acctyp, from which it is
5151 -- derived to type strmtyp. The conversion to acttyp is required
5152 -- for the derived case.
5154 Prag := Get_Stream_Convert_Pragma (P_Type);
5156 if Present (Prag) then
5158 Next (Next (First (Pragma_Argument_Associations (Prag))));
5159 Wfunc := Entity (Expression (Arg3));
5162 Make_Attribute_Reference (Loc,
5163 Prefix => New_Occurrence_Of (Etype (Wfunc), Loc),
5164 Attribute_Name => Name_Output,
5165 Expressions => New_List (
5166 Relocate_Node (First (Exprs)),
5167 Make_Function_Call (Loc,
5168 Name => New_Occurrence_Of (Wfunc, Loc),
5169 Parameter_Associations => New_List (
5170 OK_Convert_To (Etype (First_Formal (Wfunc)),
5171 Relocate_Node (Next (First (Exprs)))))))));
5176 -- For elementary types, we call the W_xxx routine directly
5178 elsif Is_Elementary_Type (U_Type) then
5179 Rewrite (N, Build_Elementary_Write_Call (N));
5185 elsif Is_Array_Type (U_Type) then
5186 Build_Array_Write_Procedure (N, U_Type, Decl, Pname);
5187 Compile_Stream_Body_In_Scope (N, Decl, U_Type, Check => False);
5189 -- Tagged type case, use the primitive Write function. Note that
5190 -- this will dispatch in the class-wide case which is what we want
5192 elsif Is_Tagged_Type (U_Type) then
5193 Pname := Find_Prim_Op (U_Type, TSS_Stream_Write);
5195 -- All other record type cases, including protected records.
5196 -- The latter only arise for expander generated code for
5197 -- handling shared passive partition access.
5201 (Is_Record_Type (U_Type) or else Is_Protected_Type (U_Type));
5203 -- Ada 2005 (AI-216): Program_Error is raised when executing
5204 -- the default implementation of the Write attribute of an
5205 -- Unchecked_Union type. However, if the 'Write reference is
5206 -- within the generated Output stream procedure, Write outputs
5207 -- the components, and the default values of the discriminant
5208 -- are streamed by the Output procedure itself.
5210 if Is_Unchecked_Union (Base_Type (U_Type))
5211 and not Is_TSS (Current_Scope, TSS_Stream_Output)
5214 Make_Raise_Program_Error (Loc,
5215 Reason => PE_Unchecked_Union_Restriction));
5218 if Has_Discriminants (U_Type)
5220 (Discriminant_Default_Value (First_Discriminant (U_Type)))
5222 Build_Mutable_Record_Write_Procedure
5223 (Loc, Base_Type (U_Type), Decl, Pname);
5225 Build_Record_Write_Procedure
5226 (Loc, Base_Type (U_Type), Decl, Pname);
5229 Insert_Action (N, Decl);
5233 -- If we fall through, Pname is the procedure to be called
5235 Rewrite_Stream_Proc_Call (Pname);
5238 -- Component_Size is handled by the back end, unless the component size
5239 -- is known at compile time, which is always true in the packed array
5240 -- case. It is important that the packed array case is handled in the
5241 -- front end (see Eval_Attribute) since the back end would otherwise get
5242 -- confused by the equivalent packed array type.
5244 when Attribute_Component_Size =>
5247 -- The following attributes are handled by the back end (except that
5248 -- static cases have already been evaluated during semantic processing,
5249 -- but in any case the back end should not count on this). The one bit
5250 -- of special processing required is that these attributes typically
5251 -- generate conditionals in the code, so we need to check the relevant
5254 when Attribute_Max |
5256 Check_Restriction (No_Implicit_Conditionals, N);
5258 -- The following attributes are handled by the back end (except that
5259 -- static cases have already been evaluated during semantic processing,
5260 -- but in any case the back end should not count on this).
5262 -- The back end also handles the non-class-wide cases of Size
5264 when Attribute_Bit_Order |
5265 Attribute_Code_Address |
5266 Attribute_Definite |
5267 Attribute_Null_Parameter |
5268 Attribute_Passed_By_Reference |
5269 Attribute_Pool_Address =>
5272 -- The following attributes are also handled by the back end, but return
5273 -- a universal integer result, so may need a conversion for checking
5274 -- that the result is in range.
5276 when Attribute_Aft |
5278 Attribute_Max_Size_In_Storage_Elements
5280 Apply_Universal_Integer_Attribute_Checks (N);
5282 -- The following attributes should not appear at this stage, since they
5283 -- have already been handled by the analyzer (and properly rewritten
5284 -- with corresponding values or entities to represent the right values)
5286 when Attribute_Abort_Signal |
5287 Attribute_Address_Size |
5290 Attribute_Compiler_Version |
5291 Attribute_Default_Bit_Order |
5298 Attribute_Fast_Math |
5299 Attribute_Has_Access_Values |
5300 Attribute_Has_Discriminants |
5301 Attribute_Has_Tagged_Values |
5303 Attribute_Machine_Emax |
5304 Attribute_Machine_Emin |
5305 Attribute_Machine_Mantissa |
5306 Attribute_Machine_Overflows |
5307 Attribute_Machine_Radix |
5308 Attribute_Machine_Rounds |
5309 Attribute_Maximum_Alignment |
5310 Attribute_Model_Emin |
5311 Attribute_Model_Epsilon |
5312 Attribute_Model_Mantissa |
5313 Attribute_Model_Small |
5315 Attribute_Partition_ID |
5317 Attribute_Safe_Emax |
5318 Attribute_Safe_First |
5319 Attribute_Safe_Large |
5320 Attribute_Safe_Last |
5321 Attribute_Safe_Small |
5323 Attribute_Signed_Zeros |
5325 Attribute_Storage_Unit |
5326 Attribute_Stub_Type |
5327 Attribute_Target_Name |
5328 Attribute_Type_Class |
5329 Attribute_Unconstrained_Array |
5330 Attribute_Universal_Literal_String |
5331 Attribute_Wchar_T_Size |
5332 Attribute_Word_Size =>
5334 raise Program_Error;
5336 -- The Asm_Input and Asm_Output attributes are not expanded at this
5337 -- stage, but will be eliminated in the expansion of the Asm call, see
5338 -- Exp_Intr for details. So the back end will never see these either.
5340 when Attribute_Asm_Input |
5341 Attribute_Asm_Output =>
5348 when RE_Not_Available =>
5350 end Expand_N_Attribute_Reference;
5352 ----------------------
5353 -- Expand_Pred_Succ --
5354 ----------------------
5356 -- For typ'Pred (exp), we generate the check
5358 -- [constraint_error when exp = typ'Base'First]
5360 -- Similarly, for typ'Succ (exp), we generate the check
5362 -- [constraint_error when exp = typ'Base'Last]
5364 -- These checks are not generated for modular types, since the proper
5365 -- semantics for Succ and Pred on modular types is to wrap, not raise CE.
5367 procedure Expand_Pred_Succ (N : Node_Id) is
5368 Loc : constant Source_Ptr := Sloc (N);
5372 if Attribute_Name (N) = Name_Pred then
5379 Make_Raise_Constraint_Error (Loc,
5383 Duplicate_Subexpr_Move_Checks (First (Expressions (N))),
5385 Make_Attribute_Reference (Loc,
5387 New_Reference_To (Base_Type (Etype (Prefix (N))), Loc),
5388 Attribute_Name => Cnam)),
5389 Reason => CE_Overflow_Check_Failed));
5390 end Expand_Pred_Succ;
5396 procedure Find_Fat_Info
5398 Fat_Type : out Entity_Id;
5399 Fat_Pkg : out RE_Id)
5401 Btyp : constant Entity_Id := Base_Type (T);
5402 Rtyp : constant Entity_Id := Root_Type (T);
5403 Digs : constant Nat := UI_To_Int (Digits_Value (Btyp));
5406 -- If the base type is VAX float, then get appropriate VAX float type
5408 if Vax_Float (Btyp) then
5411 Fat_Type := RTE (RE_Fat_VAX_F);
5412 Fat_Pkg := RE_Attr_VAX_F_Float;
5415 Fat_Type := RTE (RE_Fat_VAX_D);
5416 Fat_Pkg := RE_Attr_VAX_D_Float;
5419 Fat_Type := RTE (RE_Fat_VAX_G);
5420 Fat_Pkg := RE_Attr_VAX_G_Float;
5423 raise Program_Error;
5426 -- If root type is VAX float, this is the case where the library has
5427 -- been recompiled in VAX float mode, and we have an IEEE float type.
5428 -- This is when we use the special IEEE Fat packages.
5430 elsif Vax_Float (Rtyp) then
5433 Fat_Type := RTE (RE_Fat_IEEE_Short);
5434 Fat_Pkg := RE_Attr_IEEE_Short;
5437 Fat_Type := RTE (RE_Fat_IEEE_Long);
5438 Fat_Pkg := RE_Attr_IEEE_Long;
5441 raise Program_Error;
5444 -- If neither the base type nor the root type is VAX_Float then VAX
5445 -- float is out of the picture, and we can just use the root type.
5450 if Fat_Type = Standard_Short_Float then
5451 Fat_Pkg := RE_Attr_Short_Float;
5453 elsif Fat_Type = Standard_Float then
5454 Fat_Pkg := RE_Attr_Float;
5456 elsif Fat_Type = Standard_Long_Float then
5457 Fat_Pkg := RE_Attr_Long_Float;
5459 elsif Fat_Type = Standard_Long_Long_Float then
5460 Fat_Pkg := RE_Attr_Long_Long_Float;
5462 -- Universal real (which is its own root type) is treated as being
5463 -- equivalent to Standard.Long_Long_Float, since it is defined to
5464 -- have the same precision as the longest Float type.
5466 elsif Fat_Type = Universal_Real then
5467 Fat_Type := Standard_Long_Long_Float;
5468 Fat_Pkg := RE_Attr_Long_Long_Float;
5471 raise Program_Error;
5476 ----------------------------
5477 -- Find_Stream_Subprogram --
5478 ----------------------------
5480 function Find_Stream_Subprogram
5482 Nam : TSS_Name_Type) return Entity_Id
5484 Base_Typ : constant Entity_Id := Base_Type (Typ);
5485 Ent : constant Entity_Id := TSS (Typ, Nam);
5488 if Present (Ent) then
5492 -- Stream attributes for strings are expanded into library calls. The
5493 -- following checks are disabled when the run-time is not available or
5494 -- when compiling predefined types due to bootstrap issues. As a result,
5495 -- the compiler will generate in-place stream routines for string types
5496 -- that appear in GNAT's library, but will generate calls via rtsfind
5497 -- to library routines for user code.
5498 -- ??? For now, disable this code for JVM, since this generates a
5499 -- VerifyError exception at run-time on e.g. c330001.
5500 -- This is disabled for AAMP, to avoid making dependences on files not
5501 -- supported in the AAMP library (such as s-fileio.adb).
5503 if VM_Target /= JVM_Target
5504 and then not AAMP_On_Target
5506 not Is_Predefined_File_Name (Unit_File_Name (Current_Sem_Unit))
5508 -- String as defined in package Ada
5510 if Base_Typ = Standard_String then
5511 if Restriction_Active (No_Stream_Optimizations) then
5512 if Nam = TSS_Stream_Input then
5513 return RTE (RE_String_Input);
5515 elsif Nam = TSS_Stream_Output then
5516 return RTE (RE_String_Output);
5518 elsif Nam = TSS_Stream_Read then
5519 return RTE (RE_String_Read);
5521 else pragma Assert (Nam = TSS_Stream_Write);
5522 return RTE (RE_String_Write);
5526 if Nam = TSS_Stream_Input then
5527 return RTE (RE_String_Input_Blk_IO);
5529 elsif Nam = TSS_Stream_Output then
5530 return RTE (RE_String_Output_Blk_IO);
5532 elsif Nam = TSS_Stream_Read then
5533 return RTE (RE_String_Read_Blk_IO);
5535 else pragma Assert (Nam = TSS_Stream_Write);
5536 return RTE (RE_String_Write_Blk_IO);
5540 -- Wide_String as defined in package Ada
5542 elsif Base_Typ = Standard_Wide_String then
5543 if Restriction_Active (No_Stream_Optimizations) then
5544 if Nam = TSS_Stream_Input then
5545 return RTE (RE_Wide_String_Input);
5547 elsif Nam = TSS_Stream_Output then
5548 return RTE (RE_Wide_String_Output);
5550 elsif Nam = TSS_Stream_Read then
5551 return RTE (RE_Wide_String_Read);
5553 else pragma Assert (Nam = TSS_Stream_Write);
5554 return RTE (RE_Wide_String_Write);
5558 if Nam = TSS_Stream_Input then
5559 return RTE (RE_Wide_String_Input_Blk_IO);
5561 elsif Nam = TSS_Stream_Output then
5562 return RTE (RE_Wide_String_Output_Blk_IO);
5564 elsif Nam = TSS_Stream_Read then
5565 return RTE (RE_Wide_String_Read_Blk_IO);
5567 else pragma Assert (Nam = TSS_Stream_Write);
5568 return RTE (RE_Wide_String_Write_Blk_IO);
5572 -- Wide_Wide_String as defined in package Ada
5574 elsif Base_Typ = Standard_Wide_Wide_String then
5575 if Restriction_Active (No_Stream_Optimizations) then
5576 if Nam = TSS_Stream_Input then
5577 return RTE (RE_Wide_Wide_String_Input);
5579 elsif Nam = TSS_Stream_Output then
5580 return RTE (RE_Wide_Wide_String_Output);
5582 elsif Nam = TSS_Stream_Read then
5583 return RTE (RE_Wide_Wide_String_Read);
5585 else pragma Assert (Nam = TSS_Stream_Write);
5586 return RTE (RE_Wide_Wide_String_Write);
5590 if Nam = TSS_Stream_Input then
5591 return RTE (RE_Wide_Wide_String_Input_Blk_IO);
5593 elsif Nam = TSS_Stream_Output then
5594 return RTE (RE_Wide_Wide_String_Output_Blk_IO);
5596 elsif Nam = TSS_Stream_Read then
5597 return RTE (RE_Wide_Wide_String_Read_Blk_IO);
5599 else pragma Assert (Nam = TSS_Stream_Write);
5600 return RTE (RE_Wide_Wide_String_Write_Blk_IO);
5606 if Is_Tagged_Type (Typ)
5607 and then Is_Derived_Type (Typ)
5609 return Find_Prim_Op (Typ, Nam);
5611 return Find_Inherited_TSS (Typ, Nam);
5613 end Find_Stream_Subprogram;
5615 -----------------------
5616 -- Get_Index_Subtype --
5617 -----------------------
5619 function Get_Index_Subtype (N : Node_Id) return Node_Id is
5620 P_Type : Entity_Id := Etype (Prefix (N));
5625 if Is_Access_Type (P_Type) then
5626 P_Type := Designated_Type (P_Type);
5629 if No (Expressions (N)) then
5632 J := UI_To_Int (Expr_Value (First (Expressions (N))));
5635 Indx := First_Index (P_Type);
5641 return Etype (Indx);
5642 end Get_Index_Subtype;
5644 -------------------------------
5645 -- Get_Stream_Convert_Pragma --
5646 -------------------------------
5648 function Get_Stream_Convert_Pragma (T : Entity_Id) return Node_Id is
5653 -- Note: we cannot use Get_Rep_Pragma here because of the peculiarity
5654 -- that a stream convert pragma for a tagged type is not inherited from
5655 -- its parent. Probably what is wrong here is that it is basically
5656 -- incorrect to consider a stream convert pragma to be a representation
5657 -- pragma at all ???
5659 N := First_Rep_Item (Implementation_Base_Type (T));
5660 while Present (N) loop
5661 if Nkind (N) = N_Pragma
5662 and then Pragma_Name (N) = Name_Stream_Convert
5664 -- For tagged types this pragma is not inherited, so we
5665 -- must verify that it is defined for the given type and
5669 Entity (Expression (First (Pragma_Argument_Associations (N))));
5671 if not Is_Tagged_Type (T)
5673 or else (Is_Private_Type (Typ) and then T = Full_View (Typ))
5683 end Get_Stream_Convert_Pragma;
5685 ---------------------------------
5686 -- Is_Constrained_Packed_Array --
5687 ---------------------------------
5689 function Is_Constrained_Packed_Array (Typ : Entity_Id) return Boolean is
5690 Arr : Entity_Id := Typ;
5693 if Is_Access_Type (Arr) then
5694 Arr := Designated_Type (Arr);
5697 return Is_Array_Type (Arr)
5698 and then Is_Constrained (Arr)
5699 and then Present (Packed_Array_Type (Arr));
5700 end Is_Constrained_Packed_Array;
5702 ----------------------------------------
5703 -- Is_Inline_Floating_Point_Attribute --
5704 ----------------------------------------
5706 function Is_Inline_Floating_Point_Attribute (N : Node_Id) return Boolean is
5707 Id : constant Attribute_Id := Get_Attribute_Id (Attribute_Name (N));
5710 if Nkind (Parent (N)) /= N_Type_Conversion
5711 or else not Is_Integer_Type (Etype (Parent (N)))
5716 -- Should also support 'Machine_Rounding and 'Unbiased_Rounding, but
5717 -- required back end support has not been implemented yet ???
5719 return Id = Attribute_Truncation;
5720 end Is_Inline_Floating_Point_Attribute;
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