1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2007, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
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_Ch9; use Exp_Ch9;
34 with Exp_Imgv; use Exp_Imgv;
35 with Exp_Pakd; use Exp_Pakd;
36 with Exp_Strm; use Exp_Strm;
37 with Exp_Tss; use Exp_Tss;
38 with Exp_Util; use Exp_Util;
39 with Exp_VFpt; use Exp_VFpt;
40 with Freeze; use Freeze;
41 with Gnatvsn; use Gnatvsn;
42 with Itypes; use Itypes;
44 with Namet; use Namet;
45 with Nmake; use Nmake;
46 with Nlists; use Nlists;
48 with Restrict; use Restrict;
49 with Rident; use Rident;
50 with Rtsfind; use Rtsfind;
52 with Sem_Ch7; use Sem_Ch7;
53 with Sem_Ch8; use Sem_Ch8;
54 with Sem_Eval; use Sem_Eval;
55 with Sem_Res; use Sem_Res;
56 with Sem_Util; use Sem_Util;
57 with Sinfo; use Sinfo;
58 with Snames; use Snames;
59 with Stand; use Stand;
60 with Stringt; use Stringt;
61 with Targparm; use Targparm;
62 with Tbuild; use Tbuild;
63 with Ttypes; use Ttypes;
64 with Uintp; use Uintp;
65 with Uname; use Uname;
66 with Validsw; use Validsw;
68 package body Exp_Attr is
70 -----------------------
71 -- Local Subprograms --
72 -----------------------
74 procedure Compile_Stream_Body_In_Scope
79 -- The body for a stream subprogram may be generated outside of the scope
80 -- of the type. If the type is fully private, it may depend on the full
81 -- view of other types (e.g. indices) that are currently private as well.
82 -- We install the declarations of the package in which the type is declared
83 -- before compiling the body in what is its proper environment. The Check
84 -- parameter indicates if checks are to be suppressed for the stream body.
85 -- We suppress checks for array/record reads, since the rule is that these
86 -- are like assignments, out of range values due to uninitialized storage,
87 -- or other invalid values do NOT cause a Constraint_Error to be raised.
89 procedure Expand_Access_To_Protected_Op
94 -- An attribute reference to a protected subprogram is transformed into
95 -- a pair of pointers: one to the object, and one to the operations.
96 -- This expansion is performed for 'Access and for 'Unrestricted_Access.
98 procedure Expand_Fpt_Attribute
103 -- This procedure expands a call to a floating-point attribute function.
104 -- N is the attribute reference node, and Args is a list of arguments to
105 -- be passed to the function call. Pkg identifies the package containing
106 -- the appropriate instantiation of System.Fat_Gen. Float arguments in Args
107 -- have already been converted to the floating-point type for which Pkg was
108 -- instantiated. The Nam argument is the relevant attribute processing
109 -- routine to be called. This is the same as the attribute name, except in
110 -- the Unaligned_Valid case.
112 procedure Expand_Fpt_Attribute_R (N : Node_Id);
113 -- This procedure expands a call to a floating-point attribute function
114 -- that takes a single floating-point argument. The function to be called
115 -- is always the same as the attribute name.
117 procedure Expand_Fpt_Attribute_RI (N : Node_Id);
118 -- This procedure expands a call to a floating-point attribute function
119 -- that takes one floating-point argument and one integer argument. The
120 -- function to be called is always the same as the attribute name.
122 procedure Expand_Fpt_Attribute_RR (N : Node_Id);
123 -- This procedure expands a call to a floating-point attribute function
124 -- that takes two floating-point arguments. The function to be called
125 -- is always the same as the attribute name.
127 procedure Expand_Pred_Succ (N : Node_Id);
128 -- Handles expansion of Pred or Succ attributes for case of non-real
129 -- operand with overflow checking required.
131 function Get_Index_Subtype (N : Node_Id) return Entity_Id;
132 -- Used for Last, Last, and Length, when the prefix is an array type,
133 -- Obtains the corresponding index subtype.
135 procedure Find_Fat_Info
137 Fat_Type : out Entity_Id;
138 Fat_Pkg : out RE_Id);
139 -- Given a floating-point type T, identifies the package containing the
140 -- attributes for this type (returned in Fat_Pkg), and the corresponding
141 -- type for which this package was instantiated from Fat_Gen. Error if T
142 -- is not a floating-point type.
144 function Find_Stream_Subprogram
146 Nam : TSS_Name_Type) return Entity_Id;
147 -- Returns the stream-oriented subprogram attribute for Typ. For tagged
148 -- types, the corresponding primitive operation is looked up, else the
149 -- appropriate TSS from the type itself, or from its closest ancestor
150 -- defining it, is returned. In both cases, inheritance of representation
151 -- aspects is thus taken into account.
153 function Get_Stream_Convert_Pragma (T : Entity_Id) return Node_Id;
154 -- Given a type, find a corresponding stream convert pragma that applies to
155 -- the implementation base type of this type (Typ). If found, return the
156 -- pragma node, otherwise return Empty if no pragma is found.
158 function Is_Constrained_Packed_Array (Typ : Entity_Id) return Boolean;
159 -- Utility for array attributes, returns true on packed constrained
160 -- arrays, and on access to same.
162 function Is_Inline_Floating_Point_Attribute (N : Node_Id) return Boolean;
163 -- Returns true iff the given node refers to an attribute call that
164 -- can be expanded directly by the back end and does not need front end
165 -- expansion. Typically used for rounding and truncation attributes that
166 -- appear directly inside a conversion to integer.
168 ----------------------------------
169 -- Compile_Stream_Body_In_Scope --
170 ----------------------------------
172 procedure Compile_Stream_Body_In_Scope
178 Installed : Boolean := False;
179 Scop : constant Entity_Id := Scope (Arr);
180 Curr : constant Entity_Id := Current_Scope;
184 and then not In_Open_Scopes (Scop)
185 and then Ekind (Scop) = E_Package
188 Install_Visible_Declarations (Scop);
189 Install_Private_Declarations (Scop);
192 -- The entities in the package are now visible, but the generated
193 -- stream entity must appear in the current scope (usually an
194 -- enclosing stream function) so that itypes all have their proper
201 Insert_Action (N, Decl);
203 Insert_Action (N, Decl, Suppress => All_Checks);
208 -- Remove extra copy of current scope, and package itself
211 End_Package_Scope (Scop);
213 end Compile_Stream_Body_In_Scope;
215 -----------------------------------
216 -- Expand_Access_To_Protected_Op --
217 -----------------------------------
219 procedure Expand_Access_To_Protected_Op
224 -- The value of the attribute_reference is a record containing two
225 -- fields: an access to the protected object, and an access to the
226 -- subprogram itself. The prefix is a selected component.
228 Loc : constant Source_Ptr := Sloc (N);
230 Btyp : constant Entity_Id := Base_Type (Typ);
232 E_T : constant Entity_Id := Equivalent_Type (Btyp);
233 Acc : constant Entity_Id :=
234 Etype (Next_Component (First_Component (E_T)));
238 function May_Be_External_Call return Boolean;
239 -- If the 'Access is to a local operation, but appears in a context
240 -- where it may lead to a call from outside the object, we must treat
241 -- this as an external call. Clearly we cannot tell without full
242 -- flow analysis, and a subsequent call that uses this 'Access may
243 -- lead to a bounded error (trying to seize locks twice, e.g.). For
244 -- now we treat 'Access as a potential external call if it is an actual
245 -- in a call to an outside subprogram.
247 --------------------------
248 -- May_Be_External_Call --
249 --------------------------
251 function May_Be_External_Call return Boolean is
254 if (Nkind (Parent (N)) = N_Procedure_Call_Statement
255 or else Nkind (Parent (N)) = N_Function_Call)
256 and then Is_Entity_Name (Name (Parent (N)))
258 Subp := Entity (Name (Parent (N)));
259 return not In_Open_Scopes (Scope (Subp));
263 end May_Be_External_Call;
265 -- Start of processing for Expand_Access_To_Protected_Op
268 -- Within the body of the protected type, the prefix
269 -- designates a local operation, and the object is the first
270 -- parameter of the corresponding protected body of the
271 -- current enclosing operation.
273 if Is_Entity_Name (Pref) then
274 pragma Assert (In_Open_Scopes (Scope (Entity (Pref))));
276 if May_Be_External_Call then
279 (External_Subprogram (Entity (Pref)), Loc);
283 (Protected_Body_Subprogram (Entity (Pref)), Loc);
286 Curr := Current_Scope;
287 while Scope (Curr) /= Scope (Entity (Pref)) loop
288 Curr := Scope (Curr);
291 -- In case of protected entries the first formal of its Protected_
292 -- Body_Subprogram is the address of the object.
294 if Ekind (Curr) = E_Entry then
298 (Protected_Body_Subprogram (Curr)), Loc);
300 -- In case of protected subprograms the first formal of its
301 -- Protected_Body_Subprogram is the object and we get its address.
305 Make_Attribute_Reference (Loc,
309 (Protected_Body_Subprogram (Curr)), Loc),
310 Attribute_Name => Name_Address);
313 -- Case where the prefix is not an entity name. Find the
314 -- version of the protected operation to be called from
315 -- outside the protected object.
321 (Entity (Selector_Name (Pref))), Loc);
324 Make_Attribute_Reference (Loc,
325 Prefix => Relocate_Node (Prefix (Pref)),
326 Attribute_Name => Name_Address);
334 Unchecked_Convert_To (Acc,
335 Make_Attribute_Reference (Loc,
337 Attribute_Name => Name_Address))));
341 Analyze_And_Resolve (N, E_T);
343 -- For subsequent analysis, the node must retain its type.
344 -- The backend will replace it with the equivalent type where
348 end Expand_Access_To_Protected_Op;
350 --------------------------
351 -- Expand_Fpt_Attribute --
352 --------------------------
354 procedure Expand_Fpt_Attribute
360 Loc : constant Source_Ptr := Sloc (N);
361 Typ : constant Entity_Id := Etype (N);
365 -- The function name is the selected component Attr_xxx.yyy where
366 -- Attr_xxx is the package name, and yyy is the argument Nam.
368 -- Note: it would be more usual to have separate RE entries for each
369 -- of the entities in the Fat packages, but first they have identical
370 -- names (so we would have to have lots of renaming declarations to
371 -- meet the normal RE rule of separate names for all runtime entities),
372 -- and second there would be an awful lot of them!
375 Make_Selected_Component (Loc,
376 Prefix => New_Reference_To (RTE (Pkg), Loc),
377 Selector_Name => Make_Identifier (Loc, Nam));
379 -- The generated call is given the provided set of parameters, and then
380 -- wrapped in a conversion which converts the result to the target type
381 -- We use the base type as the target because a range check may be
385 Unchecked_Convert_To (Base_Type (Etype (N)),
386 Make_Function_Call (Loc,
388 Parameter_Associations => Args)));
390 Analyze_And_Resolve (N, Typ);
391 end Expand_Fpt_Attribute;
393 ----------------------------
394 -- Expand_Fpt_Attribute_R --
395 ----------------------------
397 -- The single argument is converted to its root type to call the
398 -- appropriate runtime function, with the actual call being built
399 -- by Expand_Fpt_Attribute
401 procedure Expand_Fpt_Attribute_R (N : Node_Id) is
402 E1 : constant Node_Id := First (Expressions (N));
406 Find_Fat_Info (Etype (E1), Ftp, Pkg);
408 (N, Pkg, Attribute_Name (N),
409 New_List (Unchecked_Convert_To (Ftp, Relocate_Node (E1))));
410 end Expand_Fpt_Attribute_R;
412 -----------------------------
413 -- Expand_Fpt_Attribute_RI --
414 -----------------------------
416 -- The first argument is converted to its root type and the second
417 -- argument is converted to standard long long integer to call the
418 -- appropriate runtime function, with the actual call being built
419 -- by Expand_Fpt_Attribute
421 procedure Expand_Fpt_Attribute_RI (N : Node_Id) is
422 E1 : constant Node_Id := First (Expressions (N));
425 E2 : constant Node_Id := Next (E1);
427 Find_Fat_Info (Etype (E1), Ftp, Pkg);
429 (N, Pkg, Attribute_Name (N),
431 Unchecked_Convert_To (Ftp, Relocate_Node (E1)),
432 Unchecked_Convert_To (Standard_Integer, Relocate_Node (E2))));
433 end Expand_Fpt_Attribute_RI;
435 -----------------------------
436 -- Expand_Fpt_Attribute_RR --
437 -----------------------------
439 -- The two arguments are converted to their root types to call the
440 -- appropriate runtime function, with the actual call being built
441 -- by Expand_Fpt_Attribute
443 procedure Expand_Fpt_Attribute_RR (N : Node_Id) is
444 E1 : constant Node_Id := First (Expressions (N));
447 E2 : constant Node_Id := Next (E1);
449 Find_Fat_Info (Etype (E1), Ftp, Pkg);
451 (N, Pkg, Attribute_Name (N),
453 Unchecked_Convert_To (Ftp, Relocate_Node (E1)),
454 Unchecked_Convert_To (Ftp, Relocate_Node (E2))));
455 end Expand_Fpt_Attribute_RR;
457 ----------------------------------
458 -- Expand_N_Attribute_Reference --
459 ----------------------------------
461 procedure Expand_N_Attribute_Reference (N : Node_Id) is
462 Loc : constant Source_Ptr := Sloc (N);
463 Typ : constant Entity_Id := Etype (N);
464 Btyp : constant Entity_Id := Base_Type (Typ);
465 Pref : constant Node_Id := Prefix (N);
466 Exprs : constant List_Id := Expressions (N);
467 Id : constant Attribute_Id := Get_Attribute_Id (Attribute_Name (N));
469 procedure Rewrite_Stream_Proc_Call (Pname : Entity_Id);
470 -- Rewrites a stream attribute for Read, Write or Output with the
471 -- procedure call. Pname is the entity for the procedure to call.
473 ------------------------------
474 -- Rewrite_Stream_Proc_Call --
475 ------------------------------
477 procedure Rewrite_Stream_Proc_Call (Pname : Entity_Id) is
478 Item : constant Node_Id := Next (First (Exprs));
479 Formal : constant Entity_Id := Next_Formal (First_Formal (Pname));
480 Formal_Typ : constant Entity_Id := Etype (Formal);
481 Is_Written : constant Boolean := (Ekind (Formal) /= E_In_Parameter);
484 -- The expansion depends on Item, the second actual, which is
485 -- the object being streamed in or out.
487 -- If the item is a component of a packed array type, and
488 -- a conversion is needed on exit, we introduce a temporary to
489 -- hold the value, because otherwise the packed reference will
490 -- not be properly expanded.
492 if Nkind (Item) = N_Indexed_Component
493 and then Is_Packed (Base_Type (Etype (Prefix (Item))))
494 and then Base_Type (Etype (Item)) /= Base_Type (Formal_Typ)
498 Temp : constant Entity_Id :=
499 Make_Defining_Identifier
500 (Loc, New_Internal_Name ('V'));
506 Make_Object_Declaration (Loc,
507 Defining_Identifier => Temp,
509 New_Occurrence_Of (Formal_Typ, Loc));
510 Set_Etype (Temp, Formal_Typ);
513 Make_Assignment_Statement (Loc,
514 Name => New_Copy_Tree (Item),
517 (Etype (Item), New_Occurrence_Of (Temp, Loc)));
519 Rewrite (Item, New_Occurrence_Of (Temp, Loc));
523 Make_Procedure_Call_Statement (Loc,
524 Name => New_Occurrence_Of (Pname, Loc),
525 Parameter_Associations => Exprs),
528 Rewrite (N, Make_Null_Statement (Loc));
533 -- For the class-wide dispatching cases, and for cases in which
534 -- the base type of the second argument matches the base type of
535 -- the corresponding formal parameter (that is to say the stream
536 -- operation is not inherited), we are all set, and can use the
537 -- argument unchanged.
539 -- For all other cases we do an unchecked conversion of the second
540 -- parameter to the type of the formal of the procedure we are
541 -- calling. This deals with the private type cases, and with going
542 -- to the root type as required in elementary type case.
544 if not Is_Class_Wide_Type (Entity (Pref))
545 and then not Is_Class_Wide_Type (Etype (Item))
546 and then Base_Type (Etype (Item)) /= Base_Type (Formal_Typ)
549 Unchecked_Convert_To (Formal_Typ, Relocate_Node (Item)));
551 -- For untagged derived types set Assignment_OK, to prevent
552 -- copies from being created when the unchecked conversion
553 -- is expanded (which would happen in Remove_Side_Effects
554 -- if Expand_N_Unchecked_Conversion were allowed to call
555 -- Force_Evaluation). The copy could violate Ada semantics
556 -- in cases such as an actual that is an out parameter.
557 -- Note that this approach is also used in exp_ch7 for calls
558 -- to controlled type operations to prevent problems with
559 -- actuals wrapped in unchecked conversions.
561 if Is_Untagged_Derivation (Etype (Expression (Item))) then
562 Set_Assignment_OK (Item);
566 -- And now rewrite the call
569 Make_Procedure_Call_Statement (Loc,
570 Name => New_Occurrence_Of (Pname, Loc),
571 Parameter_Associations => Exprs));
574 end Rewrite_Stream_Proc_Call;
576 -- Start of processing for Expand_N_Attribute_Reference
579 -- Do required validity checking, if enabled. Do not apply check to
580 -- output parameters of an Asm instruction, since the value of this
581 -- is not set till after the attribute has been elaborated.
583 if Validity_Checks_On and then Validity_Check_Operands
584 and then Id /= Attribute_Asm_Output
589 Expr := First (Expressions (N));
590 while Present (Expr) loop
597 -- Remaining processing depends on specific attribute
605 when Attribute_Access |
606 Attribute_Unchecked_Access |
607 Attribute_Unrestricted_Access =>
609 if Is_Access_Protected_Subprogram_Type (Btyp) then
610 Expand_Access_To_Protected_Op (N, Pref, Typ);
612 -- If the prefix is a type name, this is a reference to the current
613 -- instance of the type, within its initialization procedure.
615 elsif Is_Entity_Name (Pref)
616 and then Is_Type (Entity (Pref))
623 -- If the current instance name denotes a task type, then the
624 -- access attribute is rewritten to be the name of the "_task"
625 -- parameter associated with the task type's task procedure.
626 -- An unchecked conversion is applied to ensure a type match in
627 -- cases of expander-generated calls (e.g., init procs).
629 if Is_Task_Type (Entity (Pref)) then
631 First_Entity (Get_Task_Body_Procedure (Entity (Pref)));
632 while Present (Formal) loop
633 exit when Chars (Formal) = Name_uTask;
634 Next_Entity (Formal);
637 pragma Assert (Present (Formal));
640 Unchecked_Convert_To (Typ,
641 New_Occurrence_Of (Formal, Loc)));
644 -- The expression must appear in a default expression, (which
645 -- in the initialization procedure is the right-hand side of an
646 -- assignment), and not in a discriminant constraint.
650 while Present (Par) loop
651 exit when Nkind (Par) = N_Assignment_Statement;
653 if Nkind (Par) = N_Component_Declaration then
660 if Present (Par) then
662 Make_Attribute_Reference (Loc,
663 Prefix => Make_Identifier (Loc, Name_uInit),
664 Attribute_Name => Attribute_Name (N)));
666 Analyze_And_Resolve (N, Typ);
671 -- The following handles cases involving interfaces and when the
672 -- prefix of an access attribute is an explicit dereference. In the
673 -- case where the access attribute is specifically Attribute_Access,
674 -- we only do this when the context type is E_General_Access_Type,
675 -- and not for anonymous access types. It seems that this code should
676 -- be used for anonymous contexts as well, but that causes various
677 -- regressions, such as on prefix-notation calls to dispatching
678 -- operations and back-end errors on access type conversions. ???
680 elsif Id /= Attribute_Access
681 or else Ekind (Btyp) = E_General_Access_Type
684 Ref_Object : constant Node_Id := Get_Referenced_Object (Pref);
685 Parm_Ent : Entity_Id;
686 Conversion : Node_Id;
689 -- If the prefix of an Access attribute is a dereference of an
690 -- access parameter (or a renaming of such a dereference) and
691 -- the context is a general access type (but not an anonymous
692 -- access type), then rewrite the attribute as a conversion of
693 -- the access parameter to the context access type. This will
694 -- result in an accessibility check being performed, if needed.
696 -- (X.all'Access => Acc_Type (X))
698 -- Note: Limit the expansion of an attribute applied to a
699 -- dereference of an access parameter so that it's only done
700 -- for 'Access. This fixes a problem with 'Unrestricted_Access
701 -- that leads to errors in the case where the attribute type
702 -- is access-to-variable and the access parameter is
703 -- access-to-constant. The conversion is only done to get
704 -- accessibility checks, so it makes sense to limit it to
705 -- 'Access (and consistent with existing comment).
707 if Nkind (Ref_Object) = N_Explicit_Dereference
708 and then Is_Entity_Name (Prefix (Ref_Object))
709 and then Id = Attribute_Access
711 Parm_Ent := Entity (Prefix (Ref_Object));
713 if Ekind (Parm_Ent) in Formal_Kind
714 and then Ekind (Etype (Parm_Ent)) = E_Anonymous_Access_Type
715 and then Present (Extra_Accessibility (Parm_Ent))
718 Convert_To (Typ, New_Copy_Tree (Prefix (Ref_Object)));
720 Rewrite (N, Conversion);
721 Analyze_And_Resolve (N, Typ);
727 -- Ada 2005 (AI-251): If the designated type is an interface,
728 -- then rewrite the referenced object as a conversion, to force
729 -- the displacement of the pointer to the secondary dispatch
732 if Is_Interface (Directly_Designated_Type (Btyp)) then
734 -- When the object is an explicit dereference, just convert
735 -- the dereference's prefix.
737 if Nkind (Ref_Object) = N_Explicit_Dereference then
739 Convert_To (Typ, New_Copy_Tree (Prefix (Ref_Object)));
741 -- It seems rather bizarre that we generate a conversion of
742 -- a tagged object to an access type, since such conversions
743 -- are not normally permitted, but Expand_N_Type_Conversion
744 -- (actually Expand_Interface_Conversion) is designed to
745 -- handle them in the interface case. Do we really want to
746 -- create such odd conversions???
750 Convert_To (Typ, New_Copy_Tree (Ref_Object));
753 Rewrite (N, Conversion);
754 Analyze_And_Resolve (N, Typ);
763 -- Transforms 'Adjacent into a call to the floating-point attribute
764 -- function Adjacent in Fat_xxx (where xxx is the root type)
766 when Attribute_Adjacent =>
767 Expand_Fpt_Attribute_RR (N);
773 when Attribute_Address => Address : declare
774 Task_Proc : Entity_Id;
777 -- If the prefix is a task or a task type, the useful address is that
778 -- of the procedure for the task body, i.e. the actual program unit.
779 -- We replace the original entity with that of the procedure.
781 if Is_Entity_Name (Pref)
782 and then Is_Task_Type (Entity (Pref))
784 Task_Proc := Next_Entity (Root_Type (Etype (Pref)));
786 while Present (Task_Proc) loop
787 exit when Ekind (Task_Proc) = E_Procedure
788 and then Etype (First_Formal (Task_Proc)) =
789 Corresponding_Record_Type (Etype (Pref));
790 Next_Entity (Task_Proc);
793 if Present (Task_Proc) then
794 Set_Entity (Pref, Task_Proc);
795 Set_Etype (Pref, Etype (Task_Proc));
798 -- Similarly, the address of a protected operation is the address
799 -- of the corresponding protected body, regardless of the protected
800 -- object from which it is selected.
802 elsif Nkind (Pref) = N_Selected_Component
803 and then Is_Subprogram (Entity (Selector_Name (Pref)))
804 and then Is_Protected_Type (Scope (Entity (Selector_Name (Pref))))
808 External_Subprogram (Entity (Selector_Name (Pref))), Loc));
810 elsif Nkind (Pref) = N_Explicit_Dereference
811 and then Ekind (Etype (Pref)) = E_Subprogram_Type
812 and then Convention (Etype (Pref)) = Convention_Protected
814 -- The prefix is be a dereference of an access_to_protected_
815 -- subprogram. The desired address is the second component of
816 -- the record that represents the access.
819 Addr : constant Entity_Id := Etype (N);
820 Ptr : constant Node_Id := Prefix (Pref);
821 T : constant Entity_Id :=
822 Equivalent_Type (Base_Type (Etype (Ptr)));
826 Unchecked_Convert_To (Addr,
827 Make_Selected_Component (Loc,
828 Prefix => Unchecked_Convert_To (T, Ptr),
829 Selector_Name => New_Occurrence_Of (
830 Next_Entity (First_Entity (T)), Loc))));
832 Analyze_And_Resolve (N, Addr);
835 -- Ada 2005 (AI-251): Class-wide interface objects are always
836 -- "displaced" to reference the tag associated with the interface
837 -- type. In order to obtain the real address of such objects we
838 -- generate a call to a run-time subprogram that returns the base
839 -- address of the object.
841 elsif Is_Class_Wide_Type (Etype (Pref))
842 and then Is_Interface (Etype (Pref))
843 and then not (Nkind (Pref) in N_Has_Entity
844 and then Is_Subprogram (Entity (Pref)))
847 Make_Function_Call (Loc,
848 Name => New_Reference_To (RTE (RE_Base_Address), Loc),
849 Parameter_Associations => New_List (
850 Relocate_Node (N))));
855 -- Deal with packed array reference, other cases are handled by gigi
857 if Involves_Packed_Array_Reference (Pref) then
858 Expand_Packed_Address_Reference (N);
866 when Attribute_Alignment => Alignment : declare
867 Ptyp : constant Entity_Id := Etype (Pref);
871 -- For class-wide types, X'Class'Alignment is transformed into a
872 -- direct reference to the Alignment of the class type, so that the
873 -- back end does not have to deal with the X'Class'Alignment
876 if Is_Entity_Name (Pref)
877 and then Is_Class_Wide_Type (Entity (Pref))
879 Rewrite (Prefix (N), New_Occurrence_Of (Entity (Pref), Loc));
882 -- For x'Alignment applied to an object of a class wide type,
883 -- transform X'Alignment into a call to the predefined primitive
884 -- operation _Alignment applied to X.
886 elsif Is_Class_Wide_Type (Ptyp) then
888 -- No need to do anything else compiling under restriction
889 -- No_Dispatching_Calls. During the semantic analysis we
890 -- already notified such violation.
892 if Restriction_Active (No_Dispatching_Calls) then
897 Make_Function_Call (Loc,
898 Name => New_Reference_To
899 (Find_Prim_Op (Ptyp, Name_uAlignment), Loc),
900 Parameter_Associations => New_List (Pref));
902 if Typ /= Standard_Integer then
904 -- The context is a specific integer type with which the
905 -- original attribute was compatible. The function has a
906 -- specific type as well, so to preserve the compatibility
907 -- we must convert explicitly.
909 New_Node := Convert_To (Typ, New_Node);
912 Rewrite (N, New_Node);
913 Analyze_And_Resolve (N, Typ);
916 -- For all other cases, we just have to deal with the case of
917 -- the fact that the result can be universal.
920 Apply_Universal_Integer_Attribute_Checks (N);
928 when Attribute_AST_Entry => AST_Entry : declare
934 -- The reference to the entry or entry family
937 -- The index expression for an entry family reference, or
938 -- the Empty if Entry_Ref references a simple entry.
941 if Nkind (Pref) = N_Indexed_Component then
942 Entry_Ref := Prefix (Pref);
943 Index := First (Expressions (Pref));
949 -- Get expression for Task_Id and the entry entity
951 if Nkind (Entry_Ref) = N_Selected_Component then
953 Make_Attribute_Reference (Loc,
954 Attribute_Name => Name_Identity,
955 Prefix => Prefix (Entry_Ref));
957 Ttyp := Etype (Prefix (Entry_Ref));
958 Eent := Entity (Selector_Name (Entry_Ref));
962 Make_Function_Call (Loc,
963 Name => New_Occurrence_Of (RTE (RE_Current_Task), Loc));
965 Eent := Entity (Entry_Ref);
967 -- We have to find the enclosing task to get the task type
968 -- There must be one, since we already validated this earlier
970 Ttyp := Current_Scope;
971 while not Is_Task_Type (Ttyp) loop
972 Ttyp := Scope (Ttyp);
976 -- Now rewrite the attribute with a call to Create_AST_Handler
979 Make_Function_Call (Loc,
980 Name => New_Occurrence_Of (RTE (RE_Create_AST_Handler), Loc),
981 Parameter_Associations => New_List (
983 Entry_Index_Expression (Loc, Eent, Index, Ttyp))));
985 Analyze_And_Resolve (N, RTE (RE_AST_Handler));
992 -- We compute this if a component clause was present, otherwise
993 -- we leave the computation up to Gigi, since we don't know what
994 -- layout will be chosen.
996 -- Note that the attribute can apply to a naked record component
997 -- in generated code (i.e. the prefix is an identifier that
998 -- references the component or discriminant entity).
1000 when Attribute_Bit_Position => Bit_Position :
1005 if Nkind (Pref) = N_Identifier then
1006 CE := Entity (Pref);
1008 CE := Entity (Selector_Name (Pref));
1011 if Known_Static_Component_Bit_Offset (CE) then
1013 Make_Integer_Literal (Loc,
1014 Intval => Component_Bit_Offset (CE)));
1015 Analyze_And_Resolve (N, Typ);
1018 Apply_Universal_Integer_Attribute_Checks (N);
1026 -- A reference to P'Body_Version or P'Version is expanded to
1029 -- pragma Import (C, Vnn, "uuuuT";
1031 -- Get_Version_String (Vnn)
1033 -- where uuuu is the unit name (dots replaced by double underscore)
1034 -- and T is B for the cases of Body_Version, or Version applied to a
1035 -- subprogram acting as its own spec, and S for Version applied to a
1036 -- subprogram spec or package. This sequence of code references the
1037 -- the unsigned constant created in the main program by the binder.
1039 -- A special exception occurs for Standard, where the string
1040 -- returned is a copy of the library string in gnatvsn.ads.
1042 when Attribute_Body_Version | Attribute_Version => Version : declare
1043 E : constant Entity_Id :=
1044 Make_Defining_Identifier (Loc, New_Internal_Name ('V'));
1049 -- If not library unit, get to containing library unit
1051 Pent := Entity (Pref);
1052 while Pent /= Standard_Standard
1053 and then Scope (Pent) /= Standard_Standard
1054 and then not Is_Child_Unit (Pent)
1056 Pent := Scope (Pent);
1059 -- Special case Standard and Standard.ASCII
1061 if Pent = Standard_Standard or else Pent = Standard_ASCII then
1063 Make_String_Literal (Loc,
1064 Strval => Verbose_Library_Version));
1069 -- Build required string constant
1071 Get_Name_String (Get_Unit_Name (Pent));
1074 for J in 1 .. Name_Len - 2 loop
1075 if Name_Buffer (J) = '.' then
1076 Store_String_Chars ("__");
1078 Store_String_Char (Get_Char_Code (Name_Buffer (J)));
1082 -- Case of subprogram acting as its own spec, always use body
1084 if Nkind (Declaration_Node (Pent)) in N_Subprogram_Specification
1085 and then Nkind (Parent (Declaration_Node (Pent))) =
1087 and then Acts_As_Spec (Parent (Declaration_Node (Pent)))
1089 Store_String_Chars ("B");
1091 -- Case of no body present, always use spec
1093 elsif not Unit_Requires_Body (Pent) then
1094 Store_String_Chars ("S");
1096 -- Otherwise use B for Body_Version, S for spec
1098 elsif Id = Attribute_Body_Version then
1099 Store_String_Chars ("B");
1101 Store_String_Chars ("S");
1105 Lib.Version_Referenced (S);
1107 -- Insert the object declaration
1109 Insert_Actions (N, New_List (
1110 Make_Object_Declaration (Loc,
1111 Defining_Identifier => E,
1112 Object_Definition =>
1113 New_Occurrence_Of (RTE (RE_Unsigned), Loc))));
1115 -- Set entity as imported with correct external name
1117 Set_Is_Imported (E);
1118 Set_Interface_Name (E, Make_String_Literal (Loc, S));
1120 -- Set entity as internal to ensure proper Sprint output of its
1121 -- implicit importation.
1123 Set_Is_Internal (E);
1125 -- And now rewrite original reference
1128 Make_Function_Call (Loc,
1129 Name => New_Reference_To (RTE (RE_Get_Version_String), Loc),
1130 Parameter_Associations => New_List (
1131 New_Occurrence_Of (E, Loc))));
1134 Analyze_And_Resolve (N, RTE (RE_Version_String));
1141 -- Transforms 'Ceiling into a call to the floating-point attribute
1142 -- function Ceiling in Fat_xxx (where xxx is the root type)
1144 when Attribute_Ceiling =>
1145 Expand_Fpt_Attribute_R (N);
1151 -- Transforms 'Callable attribute into a call to the Callable function
1153 when Attribute_Callable => Callable :
1155 -- We have an object of a task interface class-wide type as a prefix
1156 -- to Callable. Generate:
1158 -- callable (Task_Id (Pref._disp_get_task_id));
1160 if Ada_Version >= Ada_05
1161 and then Ekind (Etype (Pref)) = E_Class_Wide_Type
1162 and then Is_Interface (Etype (Pref))
1163 and then Is_Task_Interface (Etype (Pref))
1166 Make_Function_Call (Loc,
1168 New_Reference_To (RTE (RE_Callable), Loc),
1169 Parameter_Associations => New_List (
1170 Make_Unchecked_Type_Conversion (Loc,
1172 New_Reference_To (RTE (RO_ST_Task_Id), Loc),
1174 Make_Selected_Component (Loc,
1176 New_Copy_Tree (Pref),
1178 Make_Identifier (Loc, Name_uDisp_Get_Task_Id))))));
1182 Build_Call_With_Task (Pref, RTE (RE_Callable)));
1185 Analyze_And_Resolve (N, Standard_Boolean);
1192 -- Transforms 'Caller attribute into a call to either the
1193 -- Task_Entry_Caller or the Protected_Entry_Caller function.
1195 when Attribute_Caller => Caller : declare
1196 Id_Kind : constant Entity_Id := RTE (RO_AT_Task_Id);
1197 Ent : constant Entity_Id := Entity (Pref);
1198 Conctype : constant Entity_Id := Scope (Ent);
1199 Nest_Depth : Integer := 0;
1206 if Is_Protected_Type (Conctype) then
1208 or else Restriction_Active (No_Entry_Queue) = False
1209 or else Number_Entries (Conctype) > 1
1213 (RTE (RE_Protected_Entry_Caller), Loc);
1217 (RTE (RE_Protected_Single_Entry_Caller), Loc);
1221 Unchecked_Convert_To (Id_Kind,
1222 Make_Function_Call (Loc,
1224 Parameter_Associations => New_List
1227 (Corresponding_Body (Parent (Conctype))), Loc)))));
1232 -- Determine the nesting depth of the E'Caller attribute, that
1233 -- is, how many accept statements are nested within the accept
1234 -- statement for E at the point of E'Caller. The runtime uses
1235 -- this depth to find the specified entry call.
1237 for J in reverse 0 .. Scope_Stack.Last loop
1238 S := Scope_Stack.Table (J).Entity;
1240 -- We should not reach the scope of the entry, as it should
1241 -- already have been checked in Sem_Attr that this attribute
1242 -- reference is within a matching accept statement.
1244 pragma Assert (S /= Conctype);
1249 elsif Is_Entry (S) then
1250 Nest_Depth := Nest_Depth + 1;
1255 Unchecked_Convert_To (Id_Kind,
1256 Make_Function_Call (Loc,
1257 Name => New_Reference_To (
1258 RTE (RE_Task_Entry_Caller), Loc),
1259 Parameter_Associations => New_List (
1260 Make_Integer_Literal (Loc,
1261 Intval => Int (Nest_Depth))))));
1264 Analyze_And_Resolve (N, Id_Kind);
1271 -- Transforms 'Compose into a call to the floating-point attribute
1272 -- function Compose in Fat_xxx (where xxx is the root type)
1274 -- Note: we strictly should have special code here to deal with the
1275 -- case of absurdly negative arguments (less than Integer'First)
1276 -- which will return a (signed) zero value, but it hardly seems
1277 -- worth the effort. Absurdly large positive arguments will raise
1278 -- constraint error which is fine.
1280 when Attribute_Compose =>
1281 Expand_Fpt_Attribute_RI (N);
1287 when Attribute_Constrained => Constrained : declare
1288 Formal_Ent : constant Entity_Id := Param_Entity (Pref);
1289 Typ : constant Entity_Id := Etype (Pref);
1291 function Is_Constrained_Aliased_View (Obj : Node_Id) return Boolean;
1292 -- Ada 2005 (AI-363): Returns True if the object name Obj denotes a
1293 -- view of an aliased object whose subtype is constrained.
1295 ---------------------------------
1296 -- Is_Constrained_Aliased_View --
1297 ---------------------------------
1299 function Is_Constrained_Aliased_View (Obj : Node_Id) return Boolean is
1303 if Is_Entity_Name (Obj) then
1306 if Present (Renamed_Object (E)) then
1307 return Is_Constrained_Aliased_View (Renamed_Object (E));
1310 return Is_Aliased (E) and then Is_Constrained (Etype (E));
1314 return Is_Aliased_View (Obj)
1316 (Is_Constrained (Etype (Obj))
1317 or else (Nkind (Obj) = N_Explicit_Dereference
1319 not Has_Constrained_Partial_View
1320 (Base_Type (Etype (Obj)))));
1322 end Is_Constrained_Aliased_View;
1324 -- Start of processing for Constrained
1327 -- Reference to a parameter where the value is passed as an extra
1328 -- actual, corresponding to the extra formal referenced by the
1329 -- Extra_Constrained field of the corresponding formal. If this
1330 -- is an entry in-parameter, it is replaced by a constant renaming
1331 -- for which Extra_Constrained is never created.
1333 if Present (Formal_Ent)
1334 and then Ekind (Formal_Ent) /= E_Constant
1335 and then Present (Extra_Constrained (Formal_Ent))
1339 (Extra_Constrained (Formal_Ent), Sloc (N)));
1341 -- For variables with a Extra_Constrained field, we use the
1342 -- corresponding entity.
1344 elsif Nkind (Pref) = N_Identifier
1345 and then Ekind (Entity (Pref)) = E_Variable
1346 and then Present (Extra_Constrained (Entity (Pref)))
1350 (Extra_Constrained (Entity (Pref)), Sloc (N)));
1352 -- For all other entity names, we can tell at compile time
1354 elsif Is_Entity_Name (Pref) then
1356 Ent : constant Entity_Id := Entity (Pref);
1360 -- (RM J.4) obsolescent cases
1362 if Is_Type (Ent) then
1366 if Is_Private_Type (Ent) then
1367 Res := not Has_Discriminants (Ent)
1368 or else Is_Constrained (Ent);
1370 -- It not a private type, must be a generic actual type
1371 -- that corresponded to a private type. We know that this
1372 -- correspondence holds, since otherwise the reference
1373 -- within the generic template would have been illegal.
1376 if Is_Composite_Type (Underlying_Type (Ent)) then
1377 Res := Is_Constrained (Ent);
1383 -- If the prefix is not a variable or is aliased, then
1384 -- definitely true; if it's a formal parameter without
1385 -- an associated extra formal, then treat it as constrained.
1387 -- Ada 2005 (AI-363): An aliased prefix must be known to be
1388 -- constrained in order to set the attribute to True.
1390 elsif not Is_Variable (Pref)
1391 or else Present (Formal_Ent)
1392 or else (Ada_Version < Ada_05
1393 and then Is_Aliased_View (Pref))
1394 or else (Ada_Version >= Ada_05
1395 and then Is_Constrained_Aliased_View (Pref))
1399 -- Variable case, just look at type to see if it is
1400 -- constrained. Note that the one case where this is
1401 -- not accurate (the procedure formal case), has been
1404 -- We use the Underlying_Type here (and below) in case the
1405 -- type is private without discriminants, but the full type
1406 -- has discriminants. This case is illegal, but we generate it
1407 -- internally for passing to the Extra_Constrained parameter.
1410 Res := Is_Constrained (Underlying_Type (Etype (Ent)));
1414 New_Reference_To (Boolean_Literals (Res), Loc));
1417 -- Prefix is not an entity name. These are also cases where
1418 -- we can always tell at compile time by looking at the form
1419 -- and type of the prefix. If an explicit dereference of an
1420 -- object with constrained partial view, this is unconstrained
1421 -- (Ada 2005 AI-363).
1427 not Is_Variable (Pref)
1429 (Nkind (Pref) = N_Explicit_Dereference
1431 not Has_Constrained_Partial_View (Base_Type (Typ)))
1432 or else Is_Constrained (Underlying_Type (Typ))),
1436 Analyze_And_Resolve (N, Standard_Boolean);
1443 -- Transforms 'Copy_Sign into a call to the floating-point attribute
1444 -- function Copy_Sign in Fat_xxx (where xxx is the root type)
1446 when Attribute_Copy_Sign =>
1447 Expand_Fpt_Attribute_RR (N);
1453 -- Transforms 'Count attribute into a call to the Count function
1455 when Attribute_Count => Count :
1461 Conctyp : Entity_Id;
1464 -- If the prefix is a member of an entry family, retrieve both
1465 -- entry name and index. For a simple entry there is no index.
1467 if Nkind (Pref) = N_Indexed_Component then
1468 Entnam := Prefix (Pref);
1469 Index := First (Expressions (Pref));
1475 -- Find the concurrent type in which this attribute is referenced
1476 -- (there had better be one).
1478 Conctyp := Current_Scope;
1479 while not Is_Concurrent_Type (Conctyp) loop
1480 Conctyp := Scope (Conctyp);
1485 if Is_Protected_Type (Conctyp) then
1488 or else Restriction_Active (No_Entry_Queue) = False
1489 or else Number_Entries (Conctyp) > 1
1491 Name := New_Reference_To (RTE (RE_Protected_Count), Loc);
1494 Make_Function_Call (Loc,
1496 Parameter_Associations => New_List (
1499 Corresponding_Body (Parent (Conctyp))), Loc),
1500 Entry_Index_Expression (
1501 Loc, Entity (Entnam), Index, Scope (Entity (Entnam)))));
1503 Name := New_Reference_To (RTE (RE_Protected_Count_Entry), Loc);
1505 Call := Make_Function_Call (Loc,
1507 Parameter_Associations => New_List (
1510 Corresponding_Body (Parent (Conctyp))), Loc)));
1517 Make_Function_Call (Loc,
1518 Name => New_Reference_To (RTE (RE_Task_Count), Loc),
1519 Parameter_Associations => New_List (
1520 Entry_Index_Expression
1521 (Loc, Entity (Entnam), Index, Scope (Entity (Entnam)))));
1524 -- The call returns type Natural but the context is universal integer
1525 -- so any integer type is allowed. The attribute was already resolved
1526 -- so its Etype is the required result type. If the base type of the
1527 -- context type is other than Standard.Integer we put in a conversion
1528 -- to the required type. This can be a normal typed conversion since
1529 -- both input and output types of the conversion are integer types
1531 if Base_Type (Typ) /= Base_Type (Standard_Integer) then
1532 Rewrite (N, Convert_To (Typ, Call));
1537 Analyze_And_Resolve (N, Typ);
1544 -- This processing is shared by Elab_Spec
1546 -- What we do is to insert the following declarations
1549 -- pragma Import (C, enn, "name___elabb/s");
1551 -- and then the Elab_Body/Spec attribute is replaced by a reference
1552 -- to this defining identifier.
1554 when Attribute_Elab_Body |
1555 Attribute_Elab_Spec =>
1558 Ent : constant Entity_Id :=
1559 Make_Defining_Identifier (Loc,
1560 New_Internal_Name ('E'));
1564 procedure Make_Elab_String (Nod : Node_Id);
1565 -- Given Nod, an identifier, or a selected component, put the
1566 -- image into the current string literal, with double underline
1567 -- between components.
1569 ----------------------
1570 -- Make_Elab_String --
1571 ----------------------
1573 procedure Make_Elab_String (Nod : Node_Id) is
1575 if Nkind (Nod) = N_Selected_Component then
1576 Make_Elab_String (Prefix (Nod));
1580 Store_String_Char ('$');
1582 Store_String_Char ('.');
1584 Store_String_Char ('_');
1585 Store_String_Char ('_');
1588 Get_Name_String (Chars (Selector_Name (Nod)));
1591 pragma Assert (Nkind (Nod) = N_Identifier);
1592 Get_Name_String (Chars (Nod));
1595 Store_String_Chars (Name_Buffer (1 .. Name_Len));
1596 end Make_Elab_String;
1598 -- Start of processing for Elab_Body/Elab_Spec
1601 -- First we need to prepare the string literal for the name of
1602 -- the elaboration routine to be referenced.
1605 Make_Elab_String (Pref);
1607 if VM_Target = No_VM then
1608 Store_String_Chars ("___elab");
1609 Lang := Make_Identifier (Loc, Name_C);
1611 Store_String_Chars ("._elab");
1612 Lang := Make_Identifier (Loc, Name_Ada);
1615 if Id = Attribute_Elab_Body then
1616 Store_String_Char ('b');
1618 Store_String_Char ('s');
1623 Insert_Actions (N, New_List (
1624 Make_Subprogram_Declaration (Loc,
1626 Make_Procedure_Specification (Loc,
1627 Defining_Unit_Name => Ent)),
1630 Chars => Name_Import,
1631 Pragma_Argument_Associations => New_List (
1632 Make_Pragma_Argument_Association (Loc,
1633 Expression => Lang),
1635 Make_Pragma_Argument_Association (Loc,
1637 Make_Identifier (Loc, Chars (Ent))),
1639 Make_Pragma_Argument_Association (Loc,
1641 Make_String_Literal (Loc, Str))))));
1643 Set_Entity (N, Ent);
1644 Rewrite (N, New_Occurrence_Of (Ent, Loc));
1651 -- Elaborated is always True for preelaborated units, predefined
1652 -- units, pure units and units which have Elaborate_Body pragmas.
1653 -- These units have no elaboration entity.
1655 -- Note: The Elaborated attribute is never passed through to Gigi
1657 when Attribute_Elaborated => Elaborated : declare
1658 Ent : constant Entity_Id := Entity (Pref);
1661 if Present (Elaboration_Entity (Ent)) then
1663 New_Occurrence_Of (Elaboration_Entity (Ent), Loc));
1665 Rewrite (N, New_Occurrence_Of (Standard_True, Loc));
1673 when Attribute_Enum_Rep => Enum_Rep :
1675 -- X'Enum_Rep (Y) expands to
1679 -- This is simply a direct conversion from the enumeration type
1680 -- to the target integer type, which is treated by Gigi as a normal
1681 -- integer conversion, treating the enumeration type as an integer,
1682 -- which is exactly what we want! We set Conversion_OK to make sure
1683 -- that the analyzer does not complain about what otherwise might
1684 -- be an illegal conversion.
1686 if Is_Non_Empty_List (Exprs) then
1688 OK_Convert_To (Typ, Relocate_Node (First (Exprs))));
1690 -- X'Enum_Rep where X is an enumeration literal is replaced by
1691 -- the literal value.
1693 elsif Ekind (Entity (Pref)) = E_Enumeration_Literal then
1695 Make_Integer_Literal (Loc, Enumeration_Rep (Entity (Pref))));
1697 -- If this is a renaming of a literal, recover the representation
1700 elsif Ekind (Entity (Pref)) = E_Constant
1701 and then Present (Renamed_Object (Entity (Pref)))
1703 Ekind (Entity (Renamed_Object (Entity (Pref))))
1704 = E_Enumeration_Literal
1707 Make_Integer_Literal (Loc,
1708 Enumeration_Rep (Entity (Renamed_Object (Entity (Pref))))));
1710 -- X'Enum_Rep where X is an object does a direct unchecked conversion
1711 -- of the object value, as described for the type case above.
1715 OK_Convert_To (Typ, Relocate_Node (Pref)));
1719 Analyze_And_Resolve (N, Typ);
1727 -- Transforms 'Exponent into a call to the floating-point attribute
1728 -- function Exponent in Fat_xxx (where xxx is the root type)
1730 when Attribute_Exponent =>
1731 Expand_Fpt_Attribute_R (N);
1737 -- transforme X'External_Tag into Ada.Tags.External_Tag (X'tag)
1739 when Attribute_External_Tag => External_Tag :
1742 Make_Function_Call (Loc,
1743 Name => New_Reference_To (RTE (RE_External_Tag), Loc),
1744 Parameter_Associations => New_List (
1745 Make_Attribute_Reference (Loc,
1746 Attribute_Name => Name_Tag,
1747 Prefix => Prefix (N)))));
1749 Analyze_And_Resolve (N, Standard_String);
1756 when Attribute_First => declare
1757 Ptyp : constant Entity_Id := Etype (Pref);
1760 -- If the prefix type is a constrained packed array type which
1761 -- already has a Packed_Array_Type representation defined, then
1762 -- replace this attribute with a direct reference to 'First of the
1763 -- appropriate index subtype (since otherwise Gigi will try to give
1764 -- us the value of 'First for this implementation type).
1766 if Is_Constrained_Packed_Array (Ptyp) then
1768 Make_Attribute_Reference (Loc,
1769 Attribute_Name => Name_First,
1770 Prefix => New_Reference_To (Get_Index_Subtype (N), Loc)));
1771 Analyze_And_Resolve (N, Typ);
1773 elsif Is_Access_Type (Ptyp) then
1774 Apply_Access_Check (N);
1782 -- We compute this if a component clause was present, otherwise
1783 -- we leave the computation up to Gigi, since we don't know what
1784 -- layout will be chosen.
1786 when Attribute_First_Bit => First_Bit :
1788 CE : constant Entity_Id := Entity (Selector_Name (Pref));
1791 if Known_Static_Component_Bit_Offset (CE) then
1793 Make_Integer_Literal (Loc,
1794 Component_Bit_Offset (CE) mod System_Storage_Unit));
1796 Analyze_And_Resolve (N, Typ);
1799 Apply_Universal_Integer_Attribute_Checks (N);
1809 -- fixtype'Fixed_Value (integer-value)
1813 -- fixtype(integer-value)
1815 -- we do all the required analysis of the conversion here, because
1816 -- we do not want this to go through the fixed-point conversion
1817 -- circuits. Note that gigi always treats fixed-point as equivalent
1818 -- to the corresponding integer type anyway.
1820 when Attribute_Fixed_Value => Fixed_Value :
1823 Make_Type_Conversion (Loc,
1824 Subtype_Mark => New_Occurrence_Of (Entity (Pref), Loc),
1825 Expression => Relocate_Node (First (Exprs))));
1826 Set_Etype (N, Entity (Pref));
1829 -- Note: it might appear that a properly analyzed unchecked conversion
1830 -- would be just fine here, but that's not the case, since the full
1831 -- range checks performed by the following call are critical!
1833 Apply_Type_Conversion_Checks (N);
1840 -- Transforms 'Floor into a call to the floating-point attribute
1841 -- function Floor in Fat_xxx (where xxx is the root type)
1843 when Attribute_Floor =>
1844 Expand_Fpt_Attribute_R (N);
1850 -- For the fixed-point type Typ:
1856 -- Result_Type (System.Fore (Universal_Real (Type'First)),
1857 -- Universal_Real (Type'Last))
1859 -- Note that we know that the type is a non-static subtype, or Fore
1860 -- would have itself been computed dynamically in Eval_Attribute.
1862 when Attribute_Fore => Fore :
1864 Ptyp : constant Entity_Id := Etype (Pref);
1869 Make_Function_Call (Loc,
1870 Name => New_Reference_To (RTE (RE_Fore), Loc),
1872 Parameter_Associations => New_List (
1873 Convert_To (Universal_Real,
1874 Make_Attribute_Reference (Loc,
1875 Prefix => New_Reference_To (Ptyp, Loc),
1876 Attribute_Name => Name_First)),
1878 Convert_To (Universal_Real,
1879 Make_Attribute_Reference (Loc,
1880 Prefix => New_Reference_To (Ptyp, Loc),
1881 Attribute_Name => Name_Last))))));
1883 Analyze_And_Resolve (N, Typ);
1890 -- Transforms 'Fraction into a call to the floating-point attribute
1891 -- function Fraction in Fat_xxx (where xxx is the root type)
1893 when Attribute_Fraction =>
1894 Expand_Fpt_Attribute_R (N);
1900 -- For an exception returns a reference to the exception data:
1901 -- Exception_Id!(Prefix'Reference)
1903 -- For a task it returns a reference to the _task_id component of
1904 -- corresponding record:
1906 -- taskV!(Prefix)._Task_Id, converted to the type Task_Id defined
1908 -- in Ada.Task_Identification
1910 when Attribute_Identity => Identity : declare
1911 Id_Kind : Entity_Id;
1914 if Etype (Pref) = Standard_Exception_Type then
1915 Id_Kind := RTE (RE_Exception_Id);
1917 if Present (Renamed_Object (Entity (Pref))) then
1918 Set_Entity (Pref, Renamed_Object (Entity (Pref)));
1922 Unchecked_Convert_To (Id_Kind, Make_Reference (Loc, Pref)));
1924 Id_Kind := RTE (RO_AT_Task_Id);
1927 Unchecked_Convert_To (Id_Kind, Concurrent_Ref (Pref)));
1930 Analyze_And_Resolve (N, Id_Kind);
1937 -- Image attribute is handled in separate unit Exp_Imgv
1939 when Attribute_Image =>
1940 Exp_Imgv.Expand_Image_Attribute (N);
1946 -- X'Img is expanded to typ'Image (X), where typ is the type of X
1948 when Attribute_Img => Img :
1951 Make_Attribute_Reference (Loc,
1952 Prefix => New_Reference_To (Etype (Pref), Loc),
1953 Attribute_Name => Name_Image,
1954 Expressions => New_List (Relocate_Node (Pref))));
1956 Analyze_And_Resolve (N, Standard_String);
1963 when Attribute_Input => Input : declare
1964 P_Type : constant Entity_Id := Entity (Pref);
1965 B_Type : constant Entity_Id := Base_Type (P_Type);
1966 U_Type : constant Entity_Id := Underlying_Type (P_Type);
1967 Strm : constant Node_Id := First (Exprs);
1975 Cntrl : Node_Id := Empty;
1976 -- Value for controlling argument in call. Always Empty except in
1977 -- the dispatching (class-wide type) case, where it is a reference
1978 -- to the dummy object initialized to the right internal tag.
1980 procedure Freeze_Stream_Subprogram (F : Entity_Id);
1981 -- The expansion of the attribute reference may generate a call to
1982 -- a user-defined stream subprogram that is frozen by the call. This
1983 -- can lead to access-before-elaboration problem if the reference
1984 -- appears in an object declaration and the subprogram body has not
1985 -- been seen. The freezing of the subprogram requires special code
1986 -- because it appears in an expanded context where expressions do
1987 -- not freeze their constituents.
1989 ------------------------------
1990 -- Freeze_Stream_Subprogram --
1991 ------------------------------
1993 procedure Freeze_Stream_Subprogram (F : Entity_Id) is
1994 Decl : constant Node_Id := Unit_Declaration_Node (F);
1998 -- If this is user-defined subprogram, the corresponding
1999 -- stream function appears as a renaming-as-body, and the
2000 -- user subprogram must be retrieved by tree traversal.
2003 and then Nkind (Decl) = N_Subprogram_Declaration
2004 and then Present (Corresponding_Body (Decl))
2006 Bod := Corresponding_Body (Decl);
2008 if Nkind (Unit_Declaration_Node (Bod)) =
2009 N_Subprogram_Renaming_Declaration
2011 Set_Is_Frozen (Entity (Name (Unit_Declaration_Node (Bod))));
2014 end Freeze_Stream_Subprogram;
2016 -- Start of processing for Input
2019 -- If no underlying type, we have an error that will be diagnosed
2020 -- elsewhere, so here we just completely ignore the expansion.
2026 -- If there is a TSS for Input, just call it
2028 Fname := Find_Stream_Subprogram (P_Type, TSS_Stream_Input);
2030 if Present (Fname) then
2034 -- If there is a Stream_Convert pragma, use it, we rewrite
2036 -- sourcetyp'Input (stream)
2040 -- sourcetyp (streamread (strmtyp'Input (stream)));
2042 -- where stmrearead is the given Read function that converts
2043 -- an argument of type strmtyp to type sourcetyp or a type
2044 -- from which it is derived. The extra conversion is required
2045 -- for the derived case.
2047 Prag := Get_Stream_Convert_Pragma (P_Type);
2049 if Present (Prag) then
2050 Arg2 := Next (First (Pragma_Argument_Associations (Prag)));
2051 Rfunc := Entity (Expression (Arg2));
2055 Make_Function_Call (Loc,
2056 Name => New_Occurrence_Of (Rfunc, Loc),
2057 Parameter_Associations => New_List (
2058 Make_Attribute_Reference (Loc,
2061 (Etype (First_Formal (Rfunc)), Loc),
2062 Attribute_Name => Name_Input,
2063 Expressions => Exprs)))));
2065 Analyze_And_Resolve (N, B_Type);
2070 elsif Is_Elementary_Type (U_Type) then
2072 -- A special case arises if we have a defined _Read routine,
2073 -- since in this case we are required to call this routine.
2075 if Present (TSS (Base_Type (U_Type), TSS_Stream_Read)) then
2076 Build_Record_Or_Elementary_Input_Function
2077 (Loc, U_Type, Decl, Fname);
2078 Insert_Action (N, Decl);
2080 -- For normal cases, we call the I_xxx routine directly
2083 Rewrite (N, Build_Elementary_Input_Call (N));
2084 Analyze_And_Resolve (N, P_Type);
2090 elsif Is_Array_Type (U_Type) then
2091 Build_Array_Input_Function (Loc, U_Type, Decl, Fname);
2092 Compile_Stream_Body_In_Scope (N, Decl, U_Type, Check => False);
2094 -- Dispatching case with class-wide type
2096 elsif Is_Class_Wide_Type (P_Type) then
2098 -- No need to do anything else compiling under restriction
2099 -- No_Dispatching_Calls. During the semantic analysis we
2100 -- already notified such violation.
2102 if Restriction_Active (No_Dispatching_Calls) then
2107 Rtyp : constant Entity_Id := Root_Type (P_Type);
2112 -- Read the internal tag (RM 13.13.2(34)) and use it to
2113 -- initialize a dummy tag object:
2115 -- Dnn : Ada.Tags.Tag
2116 -- := Descendant_Tag (String'Input (Strm), P_Type);
2118 -- This dummy object is used only to provide a controlling
2119 -- argument for the eventual _Input call. Descendant_Tag is
2120 -- called rather than Internal_Tag to ensure that we have a
2121 -- tag for a type that is descended from the prefix type and
2122 -- declared at the same accessibility level (the exception
2123 -- Tag_Error will be raised otherwise). The level check is
2124 -- required for Ada 2005 because tagged types can be
2125 -- extended in nested scopes (AI-344).
2128 Make_Defining_Identifier (Loc,
2129 Chars => New_Internal_Name ('D'));
2132 Make_Object_Declaration (Loc,
2133 Defining_Identifier => Dnn,
2134 Object_Definition =>
2135 New_Occurrence_Of (RTE (RE_Tag), Loc),
2137 Make_Function_Call (Loc,
2139 New_Occurrence_Of (RTE (RE_Descendant_Tag), Loc),
2140 Parameter_Associations => New_List (
2141 Make_Attribute_Reference (Loc,
2143 New_Occurrence_Of (Standard_String, Loc),
2144 Attribute_Name => Name_Input,
2145 Expressions => New_List (
2147 (Duplicate_Subexpr (Strm)))),
2148 Make_Attribute_Reference (Loc,
2149 Prefix => New_Reference_To (P_Type, Loc),
2150 Attribute_Name => Name_Tag))));
2152 Insert_Action (N, Decl);
2154 -- Now we need to get the entity for the call, and construct
2155 -- a function call node, where we preset a reference to Dnn
2156 -- as the controlling argument (doing an unchecked convert
2157 -- to the class-wide tagged type to make it look like a real
2160 Fname := Find_Prim_Op (Rtyp, TSS_Stream_Input);
2161 Cntrl := Unchecked_Convert_To (P_Type,
2162 New_Occurrence_Of (Dnn, Loc));
2163 Set_Etype (Cntrl, P_Type);
2164 Set_Parent (Cntrl, N);
2167 -- For tagged types, use the primitive Input function
2169 elsif Is_Tagged_Type (U_Type) then
2170 Fname := Find_Prim_Op (U_Type, TSS_Stream_Input);
2172 -- All other record type cases, including protected records. The
2173 -- latter only arise for expander generated code for handling
2174 -- shared passive partition access.
2178 (Is_Record_Type (U_Type) or else Is_Protected_Type (U_Type));
2180 -- Ada 2005 (AI-216): Program_Error is raised when executing
2181 -- the default implementation of the Input attribute of an
2182 -- unchecked union type if the type lacks default discriminant
2185 if Is_Unchecked_Union (Base_Type (U_Type))
2186 and then No (Discriminant_Constraint (U_Type))
2189 Make_Raise_Program_Error (Loc,
2190 Reason => PE_Unchecked_Union_Restriction));
2195 Build_Record_Or_Elementary_Input_Function
2196 (Loc, Base_Type (U_Type), Decl, Fname);
2197 Insert_Action (N, Decl);
2199 if Nkind (Parent (N)) = N_Object_Declaration
2200 and then Is_Record_Type (U_Type)
2202 -- The stream function may contain calls to user-defined
2203 -- Read procedures for individual components.
2210 Comp := First_Component (U_Type);
2211 while Present (Comp) loop
2213 Find_Stream_Subprogram
2214 (Etype (Comp), TSS_Stream_Read);
2216 if Present (Func) then
2217 Freeze_Stream_Subprogram (Func);
2220 Next_Component (Comp);
2227 -- If we fall through, Fname is the function to be called. The result
2228 -- is obtained by calling the appropriate function, then converting
2229 -- the result. The conversion does a subtype check.
2232 Make_Function_Call (Loc,
2233 Name => New_Occurrence_Of (Fname, Loc),
2234 Parameter_Associations => New_List (
2235 Relocate_Node (Strm)));
2237 Set_Controlling_Argument (Call, Cntrl);
2238 Rewrite (N, Unchecked_Convert_To (P_Type, Call));
2239 Analyze_And_Resolve (N, P_Type);
2241 if Nkind (Parent (N)) = N_Object_Declaration then
2242 Freeze_Stream_Subprogram (Fname);
2252 -- inttype'Fixed_Value (fixed-value)
2256 -- inttype(integer-value))
2258 -- we do all the required analysis of the conversion here, because
2259 -- we do not want this to go through the fixed-point conversion
2260 -- circuits. Note that gigi always treats fixed-point as equivalent
2261 -- to the corresponding integer type anyway.
2263 when Attribute_Integer_Value => Integer_Value :
2266 Make_Type_Conversion (Loc,
2267 Subtype_Mark => New_Occurrence_Of (Entity (Pref), Loc),
2268 Expression => Relocate_Node (First (Exprs))));
2269 Set_Etype (N, Entity (Pref));
2272 -- Note: it might appear that a properly analyzed unchecked conversion
2273 -- would be just fine here, but that's not the case, since the full
2274 -- range checks performed by the following call are critical!
2276 Apply_Type_Conversion_Checks (N);
2283 when Attribute_Last => declare
2284 Ptyp : constant Entity_Id := Etype (Pref);
2287 -- If the prefix type is a constrained packed array type which
2288 -- already has a Packed_Array_Type representation defined, then
2289 -- replace this attribute with a direct reference to 'Last of the
2290 -- appropriate index subtype (since otherwise Gigi will try to give
2291 -- us the value of 'Last for this implementation type).
2293 if Is_Constrained_Packed_Array (Ptyp) then
2295 Make_Attribute_Reference (Loc,
2296 Attribute_Name => Name_Last,
2297 Prefix => New_Reference_To (Get_Index_Subtype (N), Loc)));
2298 Analyze_And_Resolve (N, Typ);
2300 elsif Is_Access_Type (Ptyp) then
2301 Apply_Access_Check (N);
2309 -- We compute this if a component clause was present, otherwise
2310 -- we leave the computation up to Gigi, since we don't know what
2311 -- layout will be chosen.
2313 when Attribute_Last_Bit => Last_Bit :
2315 CE : constant Entity_Id := Entity (Selector_Name (Pref));
2318 if Known_Static_Component_Bit_Offset (CE)
2319 and then Known_Static_Esize (CE)
2322 Make_Integer_Literal (Loc,
2323 Intval => (Component_Bit_Offset (CE) mod System_Storage_Unit)
2326 Analyze_And_Resolve (N, Typ);
2329 Apply_Universal_Integer_Attribute_Checks (N);
2337 -- Transforms 'Leading_Part into a call to the floating-point attribute
2338 -- function Leading_Part in Fat_xxx (where xxx is the root type)
2340 -- Note: strictly, we should have special case code to deal with
2341 -- absurdly large positive arguments (greater than Integer'Last), which
2342 -- result in returning the first argument unchanged, but it hardly seems
2343 -- worth the effort. We raise constraint error for absurdly negative
2344 -- arguments which is fine.
2346 when Attribute_Leading_Part =>
2347 Expand_Fpt_Attribute_RI (N);
2353 when Attribute_Length => declare
2354 Ptyp : constant Entity_Id := Etype (Pref);
2359 -- Processing for packed array types
2361 if Is_Array_Type (Ptyp) and then Is_Packed (Ptyp) then
2362 Ityp := Get_Index_Subtype (N);
2364 -- If the index type, Ityp, is an enumeration type with
2365 -- holes, then we calculate X'Length explicitly using
2368 -- (0, Ityp'Pos (X'Last (N)) -
2369 -- Ityp'Pos (X'First (N)) + 1);
2371 -- Since the bounds in the template are the representation
2372 -- values and gigi would get the wrong value.
2374 if Is_Enumeration_Type (Ityp)
2375 and then Present (Enum_Pos_To_Rep (Base_Type (Ityp)))
2380 Xnum := Expr_Value (First (Expressions (N)));
2384 Make_Attribute_Reference (Loc,
2385 Prefix => New_Occurrence_Of (Typ, Loc),
2386 Attribute_Name => Name_Max,
2387 Expressions => New_List
2388 (Make_Integer_Literal (Loc, 0),
2392 Make_Op_Subtract (Loc,
2394 Make_Attribute_Reference (Loc,
2395 Prefix => New_Occurrence_Of (Ityp, Loc),
2396 Attribute_Name => Name_Pos,
2398 Expressions => New_List (
2399 Make_Attribute_Reference (Loc,
2400 Prefix => Duplicate_Subexpr (Pref),
2401 Attribute_Name => Name_Last,
2402 Expressions => New_List (
2403 Make_Integer_Literal (Loc, Xnum))))),
2406 Make_Attribute_Reference (Loc,
2407 Prefix => New_Occurrence_Of (Ityp, Loc),
2408 Attribute_Name => Name_Pos,
2410 Expressions => New_List (
2411 Make_Attribute_Reference (Loc,
2413 Duplicate_Subexpr_No_Checks (Pref),
2414 Attribute_Name => Name_First,
2415 Expressions => New_List (
2416 Make_Integer_Literal (Loc, Xnum)))))),
2418 Right_Opnd => Make_Integer_Literal (Loc, 1)))));
2420 Analyze_And_Resolve (N, Typ, Suppress => All_Checks);
2423 -- If the prefix type is a constrained packed array type which
2424 -- already has a Packed_Array_Type representation defined, then
2425 -- replace this attribute with a direct reference to 'Range_Length
2426 -- of the appropriate index subtype (since otherwise Gigi will try
2427 -- to give us the value of 'Length for this implementation type).
2429 elsif Is_Constrained (Ptyp) then
2431 Make_Attribute_Reference (Loc,
2432 Attribute_Name => Name_Range_Length,
2433 Prefix => New_Reference_To (Ityp, Loc)));
2434 Analyze_And_Resolve (N, Typ);
2437 -- If we have a packed array that is not bit packed, which was
2441 elsif Is_Access_Type (Ptyp) then
2442 Apply_Access_Check (N);
2444 -- If the designated type is a packed array type, then we
2445 -- convert the reference to:
2448 -- xtyp'Pos (Pref'Last (Expr)) -
2449 -- xtyp'Pos (Pref'First (Expr)));
2451 -- This is a bit complex, but it is the easiest thing to do
2452 -- that works in all cases including enum types with holes
2453 -- xtyp here is the appropriate index type.
2456 Dtyp : constant Entity_Id := Designated_Type (Ptyp);
2460 if Is_Array_Type (Dtyp) and then Is_Packed (Dtyp) then
2461 Xtyp := Get_Index_Subtype (N);
2464 Make_Attribute_Reference (Loc,
2465 Prefix => New_Occurrence_Of (Typ, Loc),
2466 Attribute_Name => Name_Max,
2467 Expressions => New_List (
2468 Make_Integer_Literal (Loc, 0),
2471 Make_Integer_Literal (Loc, 1),
2472 Make_Op_Subtract (Loc,
2474 Make_Attribute_Reference (Loc,
2475 Prefix => New_Occurrence_Of (Xtyp, Loc),
2476 Attribute_Name => Name_Pos,
2477 Expressions => New_List (
2478 Make_Attribute_Reference (Loc,
2479 Prefix => Duplicate_Subexpr (Pref),
2480 Attribute_Name => Name_Last,
2482 New_Copy_List (Exprs)))),
2485 Make_Attribute_Reference (Loc,
2486 Prefix => New_Occurrence_Of (Xtyp, Loc),
2487 Attribute_Name => Name_Pos,
2488 Expressions => New_List (
2489 Make_Attribute_Reference (Loc,
2491 Duplicate_Subexpr_No_Checks (Pref),
2492 Attribute_Name => Name_First,
2494 New_Copy_List (Exprs)))))))));
2496 Analyze_And_Resolve (N, Typ);
2500 -- Otherwise leave it to gigi
2503 Apply_Universal_Integer_Attribute_Checks (N);
2511 -- Transforms 'Machine into a call to the floating-point attribute
2512 -- function Machine in Fat_xxx (where xxx is the root type)
2514 when Attribute_Machine =>
2515 Expand_Fpt_Attribute_R (N);
2517 ----------------------
2518 -- Machine_Rounding --
2519 ----------------------
2521 -- Transforms 'Machine_Rounding into a call to the floating-point
2522 -- attribute function Machine_Rounding in Fat_xxx (where xxx is the root
2523 -- type). Expansion is avoided for cases the back end can handle
2526 when Attribute_Machine_Rounding =>
2527 if not Is_Inline_Floating_Point_Attribute (N) then
2528 Expand_Fpt_Attribute_R (N);
2535 -- Machine_Size is equivalent to Object_Size, so transform it into
2536 -- Object_Size and that way Gigi never sees Machine_Size.
2538 when Attribute_Machine_Size =>
2540 Make_Attribute_Reference (Loc,
2541 Prefix => Prefix (N),
2542 Attribute_Name => Name_Object_Size));
2544 Analyze_And_Resolve (N, Typ);
2550 -- The only case that can get this far is the dynamic case of the old
2551 -- Ada 83 Mantissa attribute for the fixed-point case. For this case, we
2558 -- ityp (System.Mantissa.Mantissa_Value
2559 -- (Integer'Integer_Value (typ'First),
2560 -- Integer'Integer_Value (typ'Last)));
2562 when Attribute_Mantissa => Mantissa : declare
2563 Ptyp : constant Entity_Id := Etype (Pref);
2568 Make_Function_Call (Loc,
2569 Name => New_Occurrence_Of (RTE (RE_Mantissa_Value), Loc),
2571 Parameter_Associations => New_List (
2573 Make_Attribute_Reference (Loc,
2574 Prefix => New_Occurrence_Of (Standard_Integer, Loc),
2575 Attribute_Name => Name_Integer_Value,
2576 Expressions => New_List (
2578 Make_Attribute_Reference (Loc,
2579 Prefix => New_Occurrence_Of (Ptyp, Loc),
2580 Attribute_Name => Name_First))),
2582 Make_Attribute_Reference (Loc,
2583 Prefix => New_Occurrence_Of (Standard_Integer, Loc),
2584 Attribute_Name => Name_Integer_Value,
2585 Expressions => New_List (
2587 Make_Attribute_Reference (Loc,
2588 Prefix => New_Occurrence_Of (Ptyp, Loc),
2589 Attribute_Name => Name_Last)))))));
2591 Analyze_And_Resolve (N, Typ);
2594 --------------------
2595 -- Mechanism_Code --
2596 --------------------
2598 when Attribute_Mechanism_Code =>
2600 -- We must replace the prefix in the renamed case
2602 if Is_Entity_Name (Pref)
2603 and then Present (Alias (Entity (Pref)))
2605 Set_Renamed_Subprogram (Pref, Alias (Entity (Pref)));
2612 when Attribute_Mod => Mod_Case : declare
2613 Arg : constant Node_Id := Relocate_Node (First (Exprs));
2614 Hi : constant Node_Id := Type_High_Bound (Etype (Arg));
2615 Modv : constant Uint := Modulus (Btyp);
2619 -- This is not so simple. The issue is what type to use for the
2620 -- computation of the modular value.
2622 -- The easy case is when the modulus value is within the bounds
2623 -- of the signed integer type of the argument. In this case we can
2624 -- just do the computation in that signed integer type, and then
2625 -- do an ordinary conversion to the target type.
2627 if Modv <= Expr_Value (Hi) then
2632 Right_Opnd => Make_Integer_Literal (Loc, Modv))));
2634 -- Here we know that the modulus is larger than type'Last of the
2635 -- integer type. There are two cases to consider:
2637 -- a) The integer value is non-negative. In this case, it is
2638 -- returned as the result (since it is less than the modulus).
2640 -- b) The integer value is negative. In this case, we know that the
2641 -- result is modulus + value, where the value might be as small as
2642 -- -modulus. The trouble is what type do we use to do the subtract.
2643 -- No type will do, since modulus can be as big as 2**64, and no
2644 -- integer type accomodates this value. Let's do bit of algebra
2647 -- = modulus - (-value)
2648 -- = (modulus - 1) - (-value - 1)
2650 -- Now modulus - 1 is certainly in range of the modular type.
2651 -- -value is in the range 1 .. modulus, so -value -1 is in the
2652 -- range 0 .. modulus-1 which is in range of the modular type.
2653 -- Furthermore, (-value - 1) can be expressed as -(value + 1)
2654 -- which we can compute using the integer base type.
2656 -- Once this is done we analyze the conditional expression without
2657 -- range checks, because we know everything is in range, and we
2658 -- want to prevent spurious warnings on either branch.
2662 Make_Conditional_Expression (Loc,
2663 Expressions => New_List (
2665 Left_Opnd => Duplicate_Subexpr (Arg),
2666 Right_Opnd => Make_Integer_Literal (Loc, 0)),
2669 Duplicate_Subexpr_No_Checks (Arg)),
2671 Make_Op_Subtract (Loc,
2673 Make_Integer_Literal (Loc,
2674 Intval => Modv - 1),
2680 Left_Opnd => Duplicate_Subexpr_No_Checks (Arg),
2682 Make_Integer_Literal (Loc,
2683 Intval => 1))))))));
2687 Analyze_And_Resolve (N, Btyp, Suppress => All_Checks);
2694 -- Transforms 'Model into a call to the floating-point attribute
2695 -- function Model in Fat_xxx (where xxx is the root type)
2697 when Attribute_Model =>
2698 Expand_Fpt_Attribute_R (N);
2704 -- The processing for Object_Size shares the processing for Size
2710 when Attribute_Output => Output : declare
2711 P_Type : constant Entity_Id := Entity (Pref);
2712 U_Type : constant Entity_Id := Underlying_Type (P_Type);
2720 -- If no underlying type, we have an error that will be diagnosed
2721 -- elsewhere, so here we just completely ignore the expansion.
2727 -- If TSS for Output is present, just call it
2729 Pname := Find_Stream_Subprogram (P_Type, TSS_Stream_Output);
2731 if Present (Pname) then
2735 -- If there is a Stream_Convert pragma, use it, we rewrite
2737 -- sourcetyp'Output (stream, Item)
2741 -- strmtyp'Output (Stream, strmwrite (acttyp (Item)));
2743 -- where strmwrite is the given Write function that converts an
2744 -- argument of type sourcetyp or a type acctyp, from which it is
2745 -- derived to type strmtyp. The conversion to acttyp is required
2746 -- for the derived case.
2748 Prag := Get_Stream_Convert_Pragma (P_Type);
2750 if Present (Prag) then
2752 Next (Next (First (Pragma_Argument_Associations (Prag))));
2753 Wfunc := Entity (Expression (Arg3));
2756 Make_Attribute_Reference (Loc,
2757 Prefix => New_Occurrence_Of (Etype (Wfunc), Loc),
2758 Attribute_Name => Name_Output,
2759 Expressions => New_List (
2760 Relocate_Node (First (Exprs)),
2761 Make_Function_Call (Loc,
2762 Name => New_Occurrence_Of (Wfunc, Loc),
2763 Parameter_Associations => New_List (
2764 OK_Convert_To (Etype (First_Formal (Wfunc)),
2765 Relocate_Node (Next (First (Exprs)))))))));
2770 -- For elementary types, we call the W_xxx routine directly.
2771 -- Note that the effect of Write and Output is identical for
2772 -- the case of an elementary type, since there are no
2773 -- discriminants or bounds.
2775 elsif Is_Elementary_Type (U_Type) then
2777 -- A special case arises if we have a defined _Write routine,
2778 -- since in this case we are required to call this routine.
2780 if Present (TSS (Base_Type (U_Type), TSS_Stream_Write)) then
2781 Build_Record_Or_Elementary_Output_Procedure
2782 (Loc, U_Type, Decl, Pname);
2783 Insert_Action (N, Decl);
2785 -- For normal cases, we call the W_xxx routine directly
2788 Rewrite (N, Build_Elementary_Write_Call (N));
2795 elsif Is_Array_Type (U_Type) then
2796 Build_Array_Output_Procedure (Loc, U_Type, Decl, Pname);
2797 Compile_Stream_Body_In_Scope (N, Decl, U_Type, Check => False);
2799 -- Class-wide case, first output external tag, then dispatch
2800 -- to the appropriate primitive Output function (RM 13.13.2(31)).
2802 elsif Is_Class_Wide_Type (P_Type) then
2804 -- No need to do anything else compiling under restriction
2805 -- No_Dispatching_Calls. During the semantic analysis we
2806 -- already notified such violation.
2808 if Restriction_Active (No_Dispatching_Calls) then
2813 Strm : constant Node_Id := First (Exprs);
2814 Item : constant Node_Id := Next (Strm);
2817 -- Ada 2005 (AI-344): Check that the accessibility level
2818 -- of the type of the output object is not deeper than
2819 -- that of the attribute's prefix type.
2821 -- if Get_Access_Level (Item'Tag)
2822 -- /= Get_Access_Level (P_Type'Tag)
2827 -- String'Output (Strm, External_Tag (Item'Tag));
2829 -- We cannot figure out a practical way to implement this
2830 -- accessibility check on virtual machines, so we omit it.
2832 if Ada_Version >= Ada_05
2833 and then VM_Target = No_VM
2836 Make_Implicit_If_Statement (N,
2840 Build_Get_Access_Level (Loc,
2841 Make_Attribute_Reference (Loc,
2844 Duplicate_Subexpr (Item,
2846 Attribute_Name => Name_Tag)),
2849 Make_Integer_Literal (Loc,
2850 Type_Access_Level (P_Type))),
2853 New_List (Make_Raise_Statement (Loc,
2855 RTE (RE_Tag_Error), Loc)))));
2859 Make_Attribute_Reference (Loc,
2860 Prefix => New_Occurrence_Of (Standard_String, Loc),
2861 Attribute_Name => Name_Output,
2862 Expressions => New_List (
2863 Relocate_Node (Duplicate_Subexpr (Strm)),
2864 Make_Function_Call (Loc,
2866 New_Occurrence_Of (RTE (RE_External_Tag), Loc),
2867 Parameter_Associations => New_List (
2868 Make_Attribute_Reference (Loc,
2871 (Duplicate_Subexpr (Item, Name_Req => True)),
2872 Attribute_Name => Name_Tag))))));
2875 Pname := Find_Prim_Op (U_Type, TSS_Stream_Output);
2877 -- Tagged type case, use the primitive Output function
2879 elsif Is_Tagged_Type (U_Type) then
2880 Pname := Find_Prim_Op (U_Type, TSS_Stream_Output);
2882 -- All other record type cases, including protected records.
2883 -- The latter only arise for expander generated code for
2884 -- handling shared passive partition access.
2888 (Is_Record_Type (U_Type) or else Is_Protected_Type (U_Type));
2890 -- Ada 2005 (AI-216): Program_Error is raised when executing
2891 -- the default implementation of the Output attribute of an
2892 -- unchecked union type if the type lacks default discriminant
2895 if Is_Unchecked_Union (Base_Type (U_Type))
2896 and then No (Discriminant_Constraint (U_Type))
2899 Make_Raise_Program_Error (Loc,
2900 Reason => PE_Unchecked_Union_Restriction));
2905 Build_Record_Or_Elementary_Output_Procedure
2906 (Loc, Base_Type (U_Type), Decl, Pname);
2907 Insert_Action (N, Decl);
2911 -- If we fall through, Pname is the name of the procedure to call
2913 Rewrite_Stream_Proc_Call (Pname);
2920 -- For enumeration types with a standard representation, Pos is
2923 -- For enumeration types, with a non-standard representation we
2924 -- generate a call to the _Rep_To_Pos function created when the
2925 -- type was frozen. The call has the form
2927 -- _rep_to_pos (expr, flag)
2929 -- The parameter flag is True if range checks are enabled, causing
2930 -- Program_Error to be raised if the expression has an invalid
2931 -- representation, and False if range checks are suppressed.
2933 -- For integer types, Pos is equivalent to a simple integer
2934 -- conversion and we rewrite it as such
2936 when Attribute_Pos => Pos :
2938 Etyp : Entity_Id := Base_Type (Entity (Pref));
2941 -- Deal with zero/non-zero boolean values
2943 if Is_Boolean_Type (Etyp) then
2944 Adjust_Condition (First (Exprs));
2945 Etyp := Standard_Boolean;
2946 Set_Prefix (N, New_Occurrence_Of (Standard_Boolean, Loc));
2949 -- Case of enumeration type
2951 if Is_Enumeration_Type (Etyp) then
2953 -- Non-standard enumeration type (generate call)
2955 if Present (Enum_Pos_To_Rep (Etyp)) then
2956 Append_To (Exprs, Rep_To_Pos_Flag (Etyp, Loc));
2959 Make_Function_Call (Loc,
2961 New_Reference_To (TSS (Etyp, TSS_Rep_To_Pos), Loc),
2962 Parameter_Associations => Exprs)));
2964 Analyze_And_Resolve (N, Typ);
2966 -- Standard enumeration type (do universal integer check)
2969 Apply_Universal_Integer_Attribute_Checks (N);
2972 -- Deal with integer types (replace by conversion)
2974 elsif Is_Integer_Type (Etyp) then
2975 Rewrite (N, Convert_To (Typ, First (Exprs)));
2976 Analyze_And_Resolve (N, Typ);
2985 -- We compute this if a component clause was present, otherwise
2986 -- we leave the computation up to Gigi, since we don't know what
2987 -- layout will be chosen.
2989 when Attribute_Position => Position :
2991 CE : constant Entity_Id := Entity (Selector_Name (Pref));
2994 if Present (Component_Clause (CE)) then
2996 Make_Integer_Literal (Loc,
2997 Intval => Component_Bit_Offset (CE) / System_Storage_Unit));
2998 Analyze_And_Resolve (N, Typ);
3001 Apply_Universal_Integer_Attribute_Checks (N);
3009 -- 1. Deal with enumeration types with holes
3010 -- 2. For floating-point, generate call to attribute function
3011 -- 3. For other cases, deal with constraint checking
3013 when Attribute_Pred => Pred :
3015 Ptyp : constant Entity_Id := Base_Type (Etype (Pref));
3018 -- For enumeration types with non-standard representations, we
3019 -- expand typ'Pred (x) into
3021 -- Pos_To_Rep (Rep_To_Pos (x) - 1)
3023 -- If the representation is contiguous, we compute instead
3024 -- Lit1 + Rep_to_Pos (x -1), to catch invalid representations.
3026 if Is_Enumeration_Type (Ptyp)
3027 and then Present (Enum_Pos_To_Rep (Ptyp))
3029 if Has_Contiguous_Rep (Ptyp) then
3031 Unchecked_Convert_To (Ptyp,
3034 Make_Integer_Literal (Loc,
3035 Enumeration_Rep (First_Literal (Ptyp))),
3037 Make_Function_Call (Loc,
3040 (TSS (Ptyp, TSS_Rep_To_Pos), Loc),
3042 Parameter_Associations =>
3044 Unchecked_Convert_To (Ptyp,
3045 Make_Op_Subtract (Loc,
3047 Unchecked_Convert_To (Standard_Integer,
3048 Relocate_Node (First (Exprs))),
3050 Make_Integer_Literal (Loc, 1))),
3051 Rep_To_Pos_Flag (Ptyp, Loc))))));
3054 -- Add Boolean parameter True, to request program errror if
3055 -- we have a bad representation on our hands. If checks are
3056 -- suppressed, then add False instead
3058 Append_To (Exprs, Rep_To_Pos_Flag (Ptyp, Loc));
3060 Make_Indexed_Component (Loc,
3061 Prefix => New_Reference_To (Enum_Pos_To_Rep (Ptyp), Loc),
3062 Expressions => New_List (
3063 Make_Op_Subtract (Loc,
3065 Make_Function_Call (Loc,
3067 New_Reference_To (TSS (Ptyp, TSS_Rep_To_Pos), Loc),
3068 Parameter_Associations => Exprs),
3069 Right_Opnd => Make_Integer_Literal (Loc, 1)))));
3072 Analyze_And_Resolve (N, Typ);
3074 -- For floating-point, we transform 'Pred into a call to the Pred
3075 -- floating-point attribute function in Fat_xxx (xxx is root type)
3077 elsif Is_Floating_Point_Type (Ptyp) then
3078 Expand_Fpt_Attribute_R (N);
3079 Analyze_And_Resolve (N, Typ);
3081 -- For modular types, nothing to do (no overflow, since wraps)
3083 elsif Is_Modular_Integer_Type (Ptyp) then
3086 -- For other types, if range checking is enabled, we must generate
3087 -- a check if overflow checking is enabled.
3089 elsif not Overflow_Checks_Suppressed (Ptyp) then
3090 Expand_Pred_Succ (N);
3098 -- Ada 2005 (AI-327): Dynamic ceiling priorities
3100 -- We rewrite X'Priority as the following run-time call:
3102 -- Get_Ceiling (X._Object)
3104 -- Note that although X'Priority is notionally an object, it is quite
3105 -- deliberately not defined as an aliased object in the RM. This means
3106 -- that it works fine to rewrite it as a call, without having to worry
3107 -- about complications that would other arise from X'Priority'Access,
3108 -- which is illegal, because of the lack of aliasing.
3110 when Attribute_Priority =>
3113 Conctyp : Entity_Id;
3114 Object_Parm : Node_Id;
3116 RT_Subprg_Name : Node_Id;
3119 -- Look for the enclosing concurrent type
3121 Conctyp := Current_Scope;
3122 while not Is_Concurrent_Type (Conctyp) loop
3123 Conctyp := Scope (Conctyp);
3126 pragma Assert (Is_Protected_Type (Conctyp));
3128 -- Generate the actual of the call
3130 Subprg := Current_Scope;
3131 while not Present (Protected_Body_Subprogram (Subprg)) loop
3132 Subprg := Scope (Subprg);
3135 -- Use of 'Priority inside protected entries and barriers (in
3136 -- both cases the type of the first formal of their expanded
3137 -- subprogram is Address)
3139 if Etype (First_Entity (Protected_Body_Subprogram (Subprg)))
3143 New_Itype : Entity_Id;
3146 -- In the expansion of protected entries the type of the
3147 -- first formal of the Protected_Body_Subprogram is an
3148 -- Address. In order to reference the _object component
3151 -- type T is access p__ptTV;
3154 New_Itype := Create_Itype (E_Access_Type, N);
3155 Set_Etype (New_Itype, New_Itype);
3156 Init_Esize (New_Itype);
3157 Init_Size_Align (New_Itype);
3158 Set_Directly_Designated_Type (New_Itype,
3159 Corresponding_Record_Type (Conctyp));
3160 Freeze_Itype (New_Itype, N);
3163 -- T!(O)._object'unchecked_access
3166 Make_Attribute_Reference (Loc,
3168 Make_Selected_Component (Loc,
3170 Unchecked_Convert_To (New_Itype,
3173 (Protected_Body_Subprogram (Subprg)),
3176 Make_Identifier (Loc, Name_uObject)),
3177 Attribute_Name => Name_Unchecked_Access);
3180 -- Use of 'Priority inside a protected subprogram
3184 Make_Attribute_Reference (Loc,
3186 Make_Selected_Component (Loc,
3187 Prefix => New_Reference_To
3189 (Protected_Body_Subprogram (Subprg)),
3192 Make_Identifier (Loc, Name_uObject)),
3193 Attribute_Name => Name_Unchecked_Access);
3196 -- Select the appropriate run-time subprogram
3198 if Number_Entries (Conctyp) = 0 then
3200 New_Reference_To (RTE (RE_Get_Ceiling), Loc);
3203 New_Reference_To (RTE (RO_PE_Get_Ceiling), Loc);
3207 Make_Function_Call (Loc,
3208 Name => RT_Subprg_Name,
3209 Parameter_Associations => New_List (Object_Parm));
3213 -- Avoid the generation of extra checks on the pointer to the
3214 -- protected object.
3216 Analyze_And_Resolve (N, Typ, Suppress => Access_Check);
3223 when Attribute_Range_Length => Range_Length : declare
3224 P_Type : constant Entity_Id := Etype (Pref);
3227 -- The only special processing required is for the case where
3228 -- Range_Length is applied to an enumeration type with holes.
3229 -- In this case we transform
3235 -- X'Pos (X'Last) - X'Pos (X'First) + 1
3237 -- So that the result reflects the proper Pos values instead
3238 -- of the underlying representations.
3240 if Is_Enumeration_Type (P_Type)
3241 and then Has_Non_Standard_Rep (P_Type)
3246 Make_Op_Subtract (Loc,
3248 Make_Attribute_Reference (Loc,
3249 Attribute_Name => Name_Pos,
3250 Prefix => New_Occurrence_Of (P_Type, Loc),
3251 Expressions => New_List (
3252 Make_Attribute_Reference (Loc,
3253 Attribute_Name => Name_Last,
3254 Prefix => New_Occurrence_Of (P_Type, Loc)))),
3257 Make_Attribute_Reference (Loc,
3258 Attribute_Name => Name_Pos,
3259 Prefix => New_Occurrence_Of (P_Type, Loc),
3260 Expressions => New_List (
3261 Make_Attribute_Reference (Loc,
3262 Attribute_Name => Name_First,
3263 Prefix => New_Occurrence_Of (P_Type, Loc))))),
3266 Make_Integer_Literal (Loc, 1)));
3268 Analyze_And_Resolve (N, Typ);
3270 -- For all other cases, attribute is handled by Gigi, but we need
3271 -- to deal with the case of the range check on a universal integer.
3274 Apply_Universal_Integer_Attribute_Checks (N);
3282 when Attribute_Read => Read : declare
3283 P_Type : constant Entity_Id := Entity (Pref);
3284 B_Type : constant Entity_Id := Base_Type (P_Type);
3285 U_Type : constant Entity_Id := Underlying_Type (P_Type);
3295 -- If no underlying type, we have an error that will be diagnosed
3296 -- elsewhere, so here we just completely ignore the expansion.
3302 -- The simple case, if there is a TSS for Read, just call it
3304 Pname := Find_Stream_Subprogram (P_Type, TSS_Stream_Read);
3306 if Present (Pname) then
3310 -- If there is a Stream_Convert pragma, use it, we rewrite
3312 -- sourcetyp'Read (stream, Item)
3316 -- Item := sourcetyp (strmread (strmtyp'Input (Stream)));
3318 -- where strmread is the given Read function that converts an
3319 -- argument of type strmtyp to type sourcetyp or a type from which
3320 -- it is derived. The conversion to sourcetyp is required in the
3323 -- A special case arises if Item is a type conversion in which
3324 -- case, we have to expand to:
3326 -- Itemx := typex (strmread (strmtyp'Input (Stream)));
3328 -- where Itemx is the expression of the type conversion (i.e.
3329 -- the actual object), and typex is the type of Itemx.
3331 Prag := Get_Stream_Convert_Pragma (P_Type);
3333 if Present (Prag) then
3334 Arg2 := Next (First (Pragma_Argument_Associations (Prag)));
3335 Rfunc := Entity (Expression (Arg2));
3336 Lhs := Relocate_Node (Next (First (Exprs)));
3338 OK_Convert_To (B_Type,
3339 Make_Function_Call (Loc,
3340 Name => New_Occurrence_Of (Rfunc, Loc),
3341 Parameter_Associations => New_List (
3342 Make_Attribute_Reference (Loc,
3345 (Etype (First_Formal (Rfunc)), Loc),
3346 Attribute_Name => Name_Input,
3347 Expressions => New_List (
3348 Relocate_Node (First (Exprs)))))));
3350 if Nkind (Lhs) = N_Type_Conversion then
3351 Lhs := Expression (Lhs);
3352 Rhs := Convert_To (Etype (Lhs), Rhs);
3356 Make_Assignment_Statement (Loc,
3358 Expression => Rhs));
3359 Set_Assignment_OK (Lhs);
3363 -- For elementary types, we call the I_xxx routine using the first
3364 -- parameter and then assign the result into the second parameter.
3365 -- We set Assignment_OK to deal with the conversion case.
3367 elsif Is_Elementary_Type (U_Type) then
3373 Lhs := Relocate_Node (Next (First (Exprs)));
3374 Rhs := Build_Elementary_Input_Call (N);
3376 if Nkind (Lhs) = N_Type_Conversion then
3377 Lhs := Expression (Lhs);
3378 Rhs := Convert_To (Etype (Lhs), Rhs);
3381 Set_Assignment_OK (Lhs);
3384 Make_Assignment_Statement (Loc,
3386 Expression => Rhs));
3394 elsif Is_Array_Type (U_Type) then
3395 Build_Array_Read_Procedure (N, U_Type, Decl, Pname);
3396 Compile_Stream_Body_In_Scope (N, Decl, U_Type, Check => False);
3398 -- Tagged type case, use the primitive Read function. Note that
3399 -- this will dispatch in the class-wide case which is what we want
3401 elsif Is_Tagged_Type (U_Type) then
3402 Pname := Find_Prim_Op (U_Type, TSS_Stream_Read);
3404 -- All other record type cases, including protected records. The
3405 -- latter only arise for expander generated code for handling
3406 -- shared passive partition access.
3410 (Is_Record_Type (U_Type) or else Is_Protected_Type (U_Type));
3412 -- Ada 2005 (AI-216): Program_Error is raised when executing
3413 -- the default implementation of the Read attribute of an
3414 -- Unchecked_Union type.
3416 if Is_Unchecked_Union (Base_Type (U_Type)) then
3418 Make_Raise_Program_Error (Loc,
3419 Reason => PE_Unchecked_Union_Restriction));
3422 if Has_Discriminants (U_Type)
3424 (Discriminant_Default_Value (First_Discriminant (U_Type)))
3426 Build_Mutable_Record_Read_Procedure
3427 (Loc, Base_Type (U_Type), Decl, Pname);
3429 Build_Record_Read_Procedure
3430 (Loc, Base_Type (U_Type), Decl, Pname);
3433 -- Suppress checks, uninitialized or otherwise invalid
3434 -- data does not cause constraint errors to be raised for
3435 -- a complete record read.
3437 Insert_Action (N, Decl, All_Checks);
3441 Rewrite_Stream_Proc_Call (Pname);
3448 -- Transforms 'Remainder into a call to the floating-point attribute
3449 -- function Remainder in Fat_xxx (where xxx is the root type)
3451 when Attribute_Remainder =>
3452 Expand_Fpt_Attribute_RR (N);
3458 -- The handling of the Round attribute is quite delicate. The processing
3459 -- in Sem_Attr introduced a conversion to universal real, reflecting the
3460 -- semantics of Round, but we do not want anything to do with universal
3461 -- real at runtime, since this corresponds to using floating-point
3464 -- What we have now is that the Etype of the Round attribute correctly
3465 -- indicates the final result type. The operand of the Round is the
3466 -- conversion to universal real, described above, and the operand of
3467 -- this conversion is the actual operand of Round, which may be the
3468 -- special case of a fixed point multiplication or division (Etype =
3471 -- The exapander will expand first the operand of the conversion, then
3472 -- the conversion, and finally the round attribute itself, since we
3473 -- always work inside out. But we cannot simply process naively in this
3474 -- order. In the semantic world where universal fixed and real really
3475 -- exist and have infinite precision, there is no problem, but in the
3476 -- implementation world, where universal real is a floating-point type,
3477 -- we would get the wrong result.
3479 -- So the approach is as follows. First, when expanding a multiply or
3480 -- divide whose type is universal fixed, we do nothing at all, instead
3481 -- deferring the operation till later.
3483 -- The actual processing is done in Expand_N_Type_Conversion which
3484 -- handles the special case of Round by looking at its parent to see if
3485 -- it is a Round attribute, and if it is, handling the conversion (or
3486 -- its fixed multiply/divide child) in an appropriate manner.
3488 -- This means that by the time we get to expanding the Round attribute
3489 -- itself, the Round is nothing more than a type conversion (and will
3490 -- often be a null type conversion), so we just replace it with the
3491 -- appropriate conversion operation.
3493 when Attribute_Round =>
3495 Convert_To (Etype (N), Relocate_Node (First (Exprs))));
3496 Analyze_And_Resolve (N);
3502 -- Transforms 'Rounding into a call to the floating-point attribute
3503 -- function Rounding in Fat_xxx (where xxx is the root type)
3505 when Attribute_Rounding =>
3506 Expand_Fpt_Attribute_R (N);
3512 -- Transforms 'Scaling into a call to the floating-point attribute
3513 -- function Scaling in Fat_xxx (where xxx is the root type)
3515 when Attribute_Scaling =>
3516 Expand_Fpt_Attribute_RI (N);
3522 when Attribute_Size |
3523 Attribute_Object_Size |
3524 Attribute_Value_Size |
3525 Attribute_VADS_Size => Size :
3528 Ptyp : constant Entity_Id := Etype (Pref);
3533 -- Processing for VADS_Size case. Note that this processing removes
3534 -- all traces of VADS_Size from the tree, and completes all required
3535 -- processing for VADS_Size by translating the attribute reference
3536 -- to an appropriate Size or Object_Size reference.
3538 if Id = Attribute_VADS_Size
3539 or else (Use_VADS_Size and then Id = Attribute_Size)
3541 -- If the size is specified, then we simply use the specified
3542 -- size. This applies to both types and objects. The size of an
3543 -- object can be specified in the following ways:
3545 -- An explicit size object is given for an object
3546 -- A component size is specified for an indexed component
3547 -- A component clause is specified for a selected component
3548 -- The object is a component of a packed composite object
3550 -- If the size is specified, then VADS_Size of an object
3552 if (Is_Entity_Name (Pref)
3553 and then Present (Size_Clause (Entity (Pref))))
3555 (Nkind (Pref) = N_Component_Clause
3556 and then (Present (Component_Clause
3557 (Entity (Selector_Name (Pref))))
3558 or else Is_Packed (Etype (Prefix (Pref)))))
3560 (Nkind (Pref) = N_Indexed_Component
3561 and then (Component_Size (Etype (Prefix (Pref))) /= 0
3562 or else Is_Packed (Etype (Prefix (Pref)))))
3564 Set_Attribute_Name (N, Name_Size);
3566 -- Otherwise if we have an object rather than a type, then the
3567 -- VADS_Size attribute applies to the type of the object, rather
3568 -- than the object itself. This is one of the respects in which
3569 -- VADS_Size differs from Size.
3572 if (not Is_Entity_Name (Pref)
3573 or else not Is_Type (Entity (Pref)))
3574 and then (Is_Scalar_Type (Etype (Pref))
3575 or else Is_Constrained (Etype (Pref)))
3577 Rewrite (Pref, New_Occurrence_Of (Etype (Pref), Loc));
3580 -- For a scalar type for which no size was explicitly given,
3581 -- VADS_Size means Object_Size. This is the other respect in
3582 -- which VADS_Size differs from Size.
3584 if Is_Scalar_Type (Etype (Pref))
3585 and then No (Size_Clause (Etype (Pref)))
3587 Set_Attribute_Name (N, Name_Object_Size);
3589 -- In all other cases, Size and VADS_Size are the sane
3592 Set_Attribute_Name (N, Name_Size);
3597 -- For class-wide types, X'Class'Size is transformed into a
3598 -- direct reference to the Size of the class type, so that gigi
3599 -- does not have to deal with the X'Class'Size reference.
3601 if Is_Entity_Name (Pref)
3602 and then Is_Class_Wide_Type (Entity (Pref))
3604 Rewrite (Prefix (N), New_Occurrence_Of (Entity (Pref), Loc));
3607 -- For X'Size applied to an object of a class-wide type, transform
3608 -- X'Size into a call to the primitive operation _Size applied to X.
3610 elsif Is_Class_Wide_Type (Ptyp) then
3612 -- No need to do anything else compiling under restriction
3613 -- No_Dispatching_Calls. During the semantic analysis we
3614 -- already notified such violation.
3616 if Restriction_Active (No_Dispatching_Calls) then
3621 Make_Function_Call (Loc,
3622 Name => New_Reference_To
3623 (Find_Prim_Op (Ptyp, Name_uSize), Loc),
3624 Parameter_Associations => New_List (Pref));
3626 if Typ /= Standard_Long_Long_Integer then
3628 -- The context is a specific integer type with which the
3629 -- original attribute was compatible. The function has a
3630 -- specific type as well, so to preserve the compatibility
3631 -- we must convert explicitly.
3633 New_Node := Convert_To (Typ, New_Node);
3636 Rewrite (N, New_Node);
3637 Analyze_And_Resolve (N, Typ);
3640 -- Case of known RM_Size of a type
3642 elsif (Id = Attribute_Size or else Id = Attribute_Value_Size)
3643 and then Is_Entity_Name (Pref)
3644 and then Is_Type (Entity (Pref))
3645 and then Known_Static_RM_Size (Entity (Pref))
3647 Siz := RM_Size (Entity (Pref));
3649 -- Case of known Esize of a type
3651 elsif Id = Attribute_Object_Size
3652 and then Is_Entity_Name (Pref)
3653 and then Is_Type (Entity (Pref))
3654 and then Known_Static_Esize (Entity (Pref))
3656 Siz := Esize (Entity (Pref));
3658 -- Case of known size of object
3660 elsif Id = Attribute_Size
3661 and then Is_Entity_Name (Pref)
3662 and then Is_Object (Entity (Pref))
3663 and then Known_Esize (Entity (Pref))
3664 and then Known_Static_Esize (Entity (Pref))
3666 Siz := Esize (Entity (Pref));
3668 -- For an array component, we can do Size in the front end
3669 -- if the component_size of the array is set.
3671 elsif Nkind (Pref) = N_Indexed_Component then
3672 Siz := Component_Size (Etype (Prefix (Pref)));
3674 -- For a record component, we can do Size in the front end if there
3675 -- is a component clause, or if the record is packed and the
3676 -- component's size is known at compile time.
3678 elsif Nkind (Pref) = N_Selected_Component then
3680 Rec : constant Entity_Id := Etype (Prefix (Pref));
3681 Comp : constant Entity_Id := Entity (Selector_Name (Pref));
3684 if Present (Component_Clause (Comp)) then
3685 Siz := Esize (Comp);
3687 elsif Is_Packed (Rec) then
3688 Siz := RM_Size (Ptyp);
3691 Apply_Universal_Integer_Attribute_Checks (N);
3696 -- All other cases are handled by Gigi
3699 Apply_Universal_Integer_Attribute_Checks (N);
3701 -- If Size is applied to a formal parameter that is of a packed
3702 -- array subtype, then apply Size to the actual subtype.
3704 if Is_Entity_Name (Pref)
3705 and then Is_Formal (Entity (Pref))
3706 and then Is_Array_Type (Etype (Pref))
3707 and then Is_Packed (Etype (Pref))
3710 Make_Attribute_Reference (Loc,
3712 New_Occurrence_Of (Get_Actual_Subtype (Pref), Loc),
3713 Attribute_Name => Name_Size));
3714 Analyze_And_Resolve (N, Typ);
3717 -- If Size applies to a dereference of an access to unconstrained
3718 -- packed array, GIGI needs to see its unconstrained nominal type,
3719 -- but also a hint to the actual constrained type.
3721 if Nkind (Pref) = N_Explicit_Dereference
3722 and then Is_Array_Type (Etype (Pref))
3723 and then not Is_Constrained (Etype (Pref))
3724 and then Is_Packed (Etype (Pref))
3726 Set_Actual_Designated_Subtype (Pref,
3727 Get_Actual_Subtype (Pref));
3733 -- Common processing for record and array component case
3735 if Siz /= No_Uint and then Siz /= 0 then
3736 Rewrite (N, Make_Integer_Literal (Loc, Siz));
3738 Analyze_And_Resolve (N, Typ);
3740 -- The result is not a static expression
3742 Set_Is_Static_Expression (N, False);
3750 when Attribute_Storage_Pool =>
3752 Make_Type_Conversion (Loc,
3753 Subtype_Mark => New_Reference_To (Etype (N), Loc),
3754 Expression => New_Reference_To (Entity (N), Loc)));
3755 Analyze_And_Resolve (N, Typ);
3761 when Attribute_Storage_Size => Storage_Size :
3763 Ptyp : constant Entity_Id := Etype (Pref);
3766 -- Access type case, always go to the root type
3768 -- The case of access types results in a value of zero for the case
3769 -- where no storage size attribute clause has been given. If a
3770 -- storage size has been given, then the attribute is converted
3771 -- to a reference to the variable used to hold this value.
3773 if Is_Access_Type (Ptyp) then
3774 if Present (Storage_Size_Variable (Root_Type (Ptyp))) then
3776 Make_Attribute_Reference (Loc,
3777 Prefix => New_Reference_To (Typ, Loc),
3778 Attribute_Name => Name_Max,
3779 Expressions => New_List (
3780 Make_Integer_Literal (Loc, 0),
3783 (Storage_Size_Variable (Root_Type (Ptyp)), Loc)))));
3785 elsif Present (Associated_Storage_Pool (Root_Type (Ptyp))) then
3788 Make_Function_Call (Loc,
3792 (Etype (Associated_Storage_Pool (Root_Type (Ptyp))),
3793 Attribute_Name (N)),
3796 Parameter_Associations => New_List (
3798 (Associated_Storage_Pool (Root_Type (Ptyp)), Loc)))));
3801 Rewrite (N, Make_Integer_Literal (Loc, 0));
3804 Analyze_And_Resolve (N, Typ);
3806 -- For tasks, we retrieve the size directly from the TCB. The
3807 -- size may depend on a discriminant of the type, and therefore
3808 -- can be a per-object expression, so type-level information is
3809 -- not sufficient in general. There are four cases to consider:
3811 -- a) If the attribute appears within a task body, the designated
3812 -- TCB is obtained by a call to Self.
3814 -- b) If the prefix of the attribute is the name of a task object,
3815 -- the designated TCB is the one stored in the corresponding record.
3817 -- c) If the prefix is a task type, the size is obtained from the
3818 -- size variable created for each task type
3820 -- d) If no storage_size was specified for the type , there is no
3821 -- size variable, and the value is a system-specific default.
3824 if In_Open_Scopes (Ptyp) then
3826 -- Storage_Size (Self)
3830 Make_Function_Call (Loc,
3832 New_Occurrence_Of (RTE (RE_Storage_Size), Loc),
3833 Parameter_Associations =>
3835 Make_Function_Call (Loc,
3837 New_Reference_To (RTE (RE_Self), Loc))))));
3839 elsif not Is_Entity_Name (Pref)
3840 or else not Is_Type (Entity (Pref))
3842 -- Storage_Size (Rec (Obj).Size)
3846 Make_Function_Call (Loc,
3848 New_Occurrence_Of (RTE (RE_Storage_Size), Loc),
3849 Parameter_Associations =>
3851 Make_Selected_Component (Loc,
3853 Unchecked_Convert_To (
3854 Corresponding_Record_Type (Ptyp),
3855 New_Copy_Tree (Pref)),
3857 Make_Identifier (Loc, Name_uTask_Id))))));
3859 elsif Present (Storage_Size_Variable (Ptyp)) then
3861 -- Static storage size pragma given for type: retrieve value
3862 -- from its allocated storage variable.
3866 Make_Function_Call (Loc,
3867 Name => New_Occurrence_Of (
3868 RTE (RE_Adjust_Storage_Size), Loc),
3869 Parameter_Associations =>
3872 Storage_Size_Variable (Ptyp), Loc)))));
3874 -- Get system default
3878 Make_Function_Call (Loc,
3881 RTE (RE_Default_Stack_Size), Loc))));
3884 Analyze_And_Resolve (N, Typ);
3892 when Attribute_Stream_Size => Stream_Size : declare
3893 Ptyp : constant Entity_Id := Etype (Pref);
3897 -- If we have a Stream_Size clause for this type use it, otherwise
3898 -- the Stream_Size if the size of the type.
3900 if Has_Stream_Size_Clause (Ptyp) then
3903 (Static_Integer (Expression (Stream_Size_Clause (Ptyp))));
3905 Size := UI_To_Int (Esize (Ptyp));
3908 Rewrite (N, Make_Integer_Literal (Loc, Intval => Size));
3909 Analyze_And_Resolve (N, Typ);
3916 -- 1. Deal with enumeration types with holes
3917 -- 2. For floating-point, generate call to attribute function
3918 -- 3. For other cases, deal with constraint checking
3920 when Attribute_Succ => Succ :
3922 Ptyp : constant Entity_Id := Base_Type (Etype (Pref));
3925 -- For enumeration types with non-standard representations, we
3926 -- expand typ'Succ (x) into
3928 -- Pos_To_Rep (Rep_To_Pos (x) + 1)
3930 -- If the representation is contiguous, we compute instead
3931 -- Lit1 + Rep_to_Pos (x+1), to catch invalid representations.
3933 if Is_Enumeration_Type (Ptyp)
3934 and then Present (Enum_Pos_To_Rep (Ptyp))
3936 if Has_Contiguous_Rep (Ptyp) then
3938 Unchecked_Convert_To (Ptyp,
3941 Make_Integer_Literal (Loc,
3942 Enumeration_Rep (First_Literal (Ptyp))),
3944 Make_Function_Call (Loc,
3947 (TSS (Ptyp, TSS_Rep_To_Pos), Loc),
3949 Parameter_Associations =>
3951 Unchecked_Convert_To (Ptyp,
3954 Unchecked_Convert_To (Standard_Integer,
3955 Relocate_Node (First (Exprs))),
3957 Make_Integer_Literal (Loc, 1))),
3958 Rep_To_Pos_Flag (Ptyp, Loc))))));
3960 -- Add Boolean parameter True, to request program errror if
3961 -- we have a bad representation on our hands. Add False if
3962 -- checks are suppressed.
3964 Append_To (Exprs, Rep_To_Pos_Flag (Ptyp, Loc));
3966 Make_Indexed_Component (Loc,
3967 Prefix => New_Reference_To (Enum_Pos_To_Rep (Ptyp), Loc),
3968 Expressions => New_List (
3971 Make_Function_Call (Loc,
3974 (TSS (Ptyp, TSS_Rep_To_Pos), Loc),
3975 Parameter_Associations => Exprs),
3976 Right_Opnd => Make_Integer_Literal (Loc, 1)))));
3979 Analyze_And_Resolve (N, Typ);
3981 -- For floating-point, we transform 'Succ into a call to the Succ
3982 -- floating-point attribute function in Fat_xxx (xxx is root type)
3984 elsif Is_Floating_Point_Type (Ptyp) then
3985 Expand_Fpt_Attribute_R (N);
3986 Analyze_And_Resolve (N, Typ);
3988 -- For modular types, nothing to do (no overflow, since wraps)
3990 elsif Is_Modular_Integer_Type (Ptyp) then
3993 -- For other types, if range checking is enabled, we must generate
3994 -- a check if overflow checking is enabled.
3996 elsif not Overflow_Checks_Suppressed (Ptyp) then
3997 Expand_Pred_Succ (N);
4005 -- Transforms X'Tag into a direct reference to the tag of X
4007 when Attribute_Tag => Tag :
4010 Prefix_Is_Type : Boolean;
4013 if Is_Entity_Name (Pref) and then Is_Type (Entity (Pref)) then
4014 Ttyp := Entity (Pref);
4015 Prefix_Is_Type := True;
4017 Ttyp := Etype (Pref);
4018 Prefix_Is_Type := False;
4021 if Is_Class_Wide_Type (Ttyp) then
4022 Ttyp := Root_Type (Ttyp);
4025 Ttyp := Underlying_Type (Ttyp);
4027 if Prefix_Is_Type then
4029 -- For VMs we leave the type attribute unexpanded because
4030 -- there's not a dispatching table to reference.
4032 if VM_Target = No_VM then
4034 Unchecked_Convert_To (RTE (RE_Tag),
4036 (Node (First_Elmt (Access_Disp_Table (Ttyp))), Loc)));
4037 Analyze_And_Resolve (N, RTE (RE_Tag));
4040 -- (Ada 2005 (AI-251): The use of 'Tag in the sources always
4041 -- references the primary tag of the actual object. If 'Tag is
4042 -- applied to class-wide interface objects we generate code that
4043 -- displaces "this" to reference the base of the object.
4045 elsif Comes_From_Source (N)
4046 and then Is_Class_Wide_Type (Etype (Prefix (N)))
4047 and then Is_Interface (Etype (Prefix (N)))
4050 -- (To_Tag_Ptr (Prefix'Address)).all
4052 -- Note that Prefix'Address is recursively expanded into a call
4053 -- to Base_Address (Obj.Tag)
4056 Make_Explicit_Dereference (Loc,
4057 Unchecked_Convert_To (RTE (RE_Tag_Ptr),
4058 Make_Attribute_Reference (Loc,
4059 Prefix => Relocate_Node (Pref),
4060 Attribute_Name => Name_Address))));
4061 Analyze_And_Resolve (N, RTE (RE_Tag));
4065 Make_Selected_Component (Loc,
4066 Prefix => Relocate_Node (Pref),
4068 New_Reference_To (First_Tag_Component (Ttyp), Loc)));
4069 Analyze_And_Resolve (N, RTE (RE_Tag));
4077 -- Transforms 'Terminated attribute into a call to Terminated function
4079 when Attribute_Terminated => Terminated :
4081 -- The prefix of Terminated is of a task interface class-wide type.
4084 -- terminated (Task_Id (Pref._disp_get_task_id));
4086 if Ada_Version >= Ada_05
4087 and then Ekind (Etype (Pref)) = E_Class_Wide_Type
4088 and then Is_Interface (Etype (Pref))
4089 and then Is_Task_Interface (Etype (Pref))
4092 Make_Function_Call (Loc,
4094 New_Reference_To (RTE (RE_Terminated), Loc),
4095 Parameter_Associations => New_List (
4096 Make_Unchecked_Type_Conversion (Loc,
4098 New_Reference_To (RTE (RO_ST_Task_Id), Loc),
4100 Make_Selected_Component (Loc,
4102 New_Copy_Tree (Pref),
4104 Make_Identifier (Loc, Name_uDisp_Get_Task_Id))))));
4106 elsif Restricted_Profile then
4108 Build_Call_With_Task (Pref, RTE (RE_Restricted_Terminated)));
4112 Build_Call_With_Task (Pref, RTE (RE_Terminated)));
4115 Analyze_And_Resolve (N, Standard_Boolean);
4122 -- Transforms System'To_Address (X) into unchecked conversion
4123 -- from (integral) type of X to type address.
4125 when Attribute_To_Address =>
4127 Unchecked_Convert_To (RTE (RE_Address),
4128 Relocate_Node (First (Exprs))));
4129 Analyze_And_Resolve (N, RTE (RE_Address));
4135 -- Transforms 'Truncation into a call to the floating-point attribute
4136 -- function Truncation in Fat_xxx (where xxx is the root type).
4137 -- Expansion is avoided for cases the back end can handle directly.
4139 when Attribute_Truncation =>
4140 if not Is_Inline_Floating_Point_Attribute (N) then
4141 Expand_Fpt_Attribute_R (N);
4144 -----------------------
4145 -- Unbiased_Rounding --
4146 -----------------------
4148 -- Transforms 'Unbiased_Rounding into a call to the floating-point
4149 -- attribute function Unbiased_Rounding in Fat_xxx (where xxx is the
4150 -- root type). Expansion is avoided for cases the back end can handle
4153 when Attribute_Unbiased_Rounding =>
4154 if not Is_Inline_Floating_Point_Attribute (N) then
4155 Expand_Fpt_Attribute_R (N);
4162 when Attribute_UET_Address => UET_Address : declare
4163 Ent : constant Entity_Id :=
4164 Make_Defining_Identifier (Loc, New_Internal_Name ('T'));
4168 Make_Object_Declaration (Loc,
4169 Defining_Identifier => Ent,
4170 Aliased_Present => True,
4171 Object_Definition =>
4172 New_Occurrence_Of (RTE (RE_Address), Loc)));
4174 -- Construct name __gnat_xxx__SDP, where xxx is the unit name
4175 -- in normal external form.
4177 Get_External_Unit_Name_String (Get_Unit_Name (Pref));
4178 Name_Buffer (1 + 7 .. Name_Len + 7) := Name_Buffer (1 .. Name_Len);
4179 Name_Len := Name_Len + 7;
4180 Name_Buffer (1 .. 7) := "__gnat_";
4181 Name_Buffer (Name_Len + 1 .. Name_Len + 5) := "__SDP";
4182 Name_Len := Name_Len + 5;
4184 Set_Is_Imported (Ent);
4185 Set_Interface_Name (Ent,
4186 Make_String_Literal (Loc,
4187 Strval => String_From_Name_Buffer));
4189 -- Set entity as internal to ensure proper Sprint output of its
4190 -- implicit importation.
4192 Set_Is_Internal (Ent);
4195 Make_Attribute_Reference (Loc,
4196 Prefix => New_Occurrence_Of (Ent, Loc),
4197 Attribute_Name => Name_Address));
4199 Analyze_And_Resolve (N, Typ);
4206 -- The processing for VADS_Size is shared with Size
4212 -- For enumeration types with a standard representation, and for all
4213 -- other types, Val is handled by Gigi. For enumeration types with
4214 -- a non-standard representation we use the _Pos_To_Rep array that
4215 -- was created when the type was frozen.
4217 when Attribute_Val => Val :
4219 Etyp : constant Entity_Id := Base_Type (Entity (Pref));
4222 if Is_Enumeration_Type (Etyp)
4223 and then Present (Enum_Pos_To_Rep (Etyp))
4225 if Has_Contiguous_Rep (Etyp) then
4227 Rep_Node : constant Node_Id :=
4228 Unchecked_Convert_To (Etyp,
4231 Make_Integer_Literal (Loc,
4232 Enumeration_Rep (First_Literal (Etyp))),
4234 (Convert_To (Standard_Integer,
4235 Relocate_Node (First (Exprs))))));
4239 Unchecked_Convert_To (Etyp,
4242 Make_Integer_Literal (Loc,
4243 Enumeration_Rep (First_Literal (Etyp))),
4245 Make_Function_Call (Loc,
4248 (TSS (Etyp, TSS_Rep_To_Pos), Loc),
4249 Parameter_Associations => New_List (
4251 Rep_To_Pos_Flag (Etyp, Loc))))));
4256 Make_Indexed_Component (Loc,
4257 Prefix => New_Reference_To (Enum_Pos_To_Rep (Etyp), Loc),
4258 Expressions => New_List (
4259 Convert_To (Standard_Integer,
4260 Relocate_Node (First (Exprs))))));
4263 Analyze_And_Resolve (N, Typ);
4271 -- The code for valid is dependent on the particular types involved.
4272 -- See separate sections below for the generated code in each case.
4274 when Attribute_Valid => Valid :
4276 Ptyp : constant Entity_Id := Etype (Pref);
4277 Btyp : Entity_Id := Base_Type (Ptyp);
4280 Save_Validity_Checks_On : constant Boolean := Validity_Checks_On;
4281 -- Save the validity checking mode. We always turn off validity
4282 -- checking during process of 'Valid since this is one place
4283 -- where we do not want the implicit validity checks to intefere
4284 -- with the explicit validity check that the programmer is doing.
4286 function Make_Range_Test return Node_Id;
4287 -- Build the code for a range test of the form
4288 -- Btyp!(Pref) >= Btyp!(Ptyp'First)
4290 -- Btyp!(Pref) <= Btyp!(Ptyp'Last)
4292 ---------------------
4293 -- Make_Range_Test --
4294 ---------------------
4296 function Make_Range_Test return Node_Id is
4303 Unchecked_Convert_To (Btyp, Duplicate_Subexpr (Pref)),
4306 Unchecked_Convert_To (Btyp,
4307 Make_Attribute_Reference (Loc,
4308 Prefix => New_Occurrence_Of (Ptyp, Loc),
4309 Attribute_Name => Name_First))),
4314 Unchecked_Convert_To (Btyp,
4315 Duplicate_Subexpr_No_Checks (Pref)),
4318 Unchecked_Convert_To (Btyp,
4319 Make_Attribute_Reference (Loc,
4320 Prefix => New_Occurrence_Of (Ptyp, Loc),
4321 Attribute_Name => Name_Last))));
4322 end Make_Range_Test;
4324 -- Start of processing for Attribute_Valid
4327 -- Turn off validity checks. We do not want any implicit validity
4328 -- checks to intefere with the explicit check from the attribute
4330 Validity_Checks_On := False;
4332 -- Floating-point case. This case is handled by the Valid attribute
4333 -- code in the floating-point attribute run-time library.
4335 if Is_Floating_Point_Type (Ptyp) then
4341 -- For vax fpt types, call appropriate routine in special vax
4342 -- floating point unit. We do not have to worry about loads in
4343 -- this case, since these types have no signalling NaN's.
4345 if Vax_Float (Btyp) then
4346 Expand_Vax_Valid (N);
4348 -- The AAMP back end handles Valid for floating-point types
4350 elsif Is_AAMP_Float (Btyp) then
4351 Analyze_And_Resolve (Pref, Ptyp);
4352 Set_Etype (N, Standard_Boolean);
4355 -- Non VAX float case
4358 Find_Fat_Info (Etype (Pref), Ftp, Pkg);
4360 -- If the floating-point object might be unaligned, we need
4361 -- to call the special routine Unaligned_Valid, which makes
4362 -- the needed copy, being careful not to load the value into
4363 -- any floating-point register. The argument in this case is
4364 -- obj'Address (see Unaligned_Valid routine in Fat_Gen).
4366 if Is_Possibly_Unaligned_Object (Pref) then
4367 Expand_Fpt_Attribute
4368 (N, Pkg, Name_Unaligned_Valid,
4370 Make_Attribute_Reference (Loc,
4371 Prefix => Relocate_Node (Pref),
4372 Attribute_Name => Name_Address)));
4374 -- In the normal case where we are sure the object is
4375 -- aligned, we generate a call to Valid, and the argument in
4376 -- this case is obj'Unrestricted_Access (after converting
4377 -- obj to the right floating-point type).
4380 Expand_Fpt_Attribute
4381 (N, Pkg, Name_Valid,
4383 Make_Attribute_Reference (Loc,
4384 Prefix => Unchecked_Convert_To (Ftp, Pref),
4385 Attribute_Name => Name_Unrestricted_Access)));
4389 -- One more task, we still need a range check. Required
4390 -- only if we have a constraint, since the Valid routine
4391 -- catches infinities properly (infinities are never valid).
4393 -- The way we do the range check is simply to create the
4394 -- expression: Valid (N) and then Base_Type(Pref) in Typ.
4396 if not Subtypes_Statically_Match (Ptyp, Btyp) then
4399 Left_Opnd => Relocate_Node (N),
4402 Left_Opnd => Convert_To (Btyp, Pref),
4403 Right_Opnd => New_Occurrence_Of (Ptyp, Loc))));
4407 -- Enumeration type with holes
4409 -- For enumeration types with holes, the Pos value constructed by
4410 -- the Enum_Rep_To_Pos function built in Exp_Ch3 called with a
4411 -- second argument of False returns minus one for an invalid value,
4412 -- and the non-negative pos value for a valid value, so the
4413 -- expansion of X'Valid is simply:
4415 -- type(X)'Pos (X) >= 0
4417 -- We can't quite generate it that way because of the requirement
4418 -- for the non-standard second argument of False in the resulting
4419 -- rep_to_pos call, so we have to explicitly create:
4421 -- _rep_to_pos (X, False) >= 0
4423 -- If we have an enumeration subtype, we also check that the
4424 -- value is in range:
4426 -- _rep_to_pos (X, False) >= 0
4428 -- (X >= type(X)'First and then type(X)'Last <= X)
4430 elsif Is_Enumeration_Type (Ptyp)
4431 and then Present (Enum_Pos_To_Rep (Base_Type (Ptyp)))
4436 Make_Function_Call (Loc,
4439 (TSS (Base_Type (Ptyp), TSS_Rep_To_Pos), Loc),
4440 Parameter_Associations => New_List (
4442 New_Occurrence_Of (Standard_False, Loc))),
4443 Right_Opnd => Make_Integer_Literal (Loc, 0));
4447 (Type_Low_Bound (Ptyp) /= Type_Low_Bound (Btyp)
4449 Type_High_Bound (Ptyp) /= Type_High_Bound (Btyp))
4451 -- The call to Make_Range_Test will create declarations
4452 -- that need a proper insertion point, but Pref is now
4453 -- attached to a node with no ancestor. Attach to tree
4454 -- even if it is to be rewritten below.
4456 Set_Parent (Tst, Parent (N));
4460 Left_Opnd => Make_Range_Test,
4466 -- Fortran convention booleans
4468 -- For the very special case of Fortran convention booleans, the
4469 -- value is always valid, since it is an integer with the semantics
4470 -- that non-zero is true, and any value is permissible.
4472 elsif Is_Boolean_Type (Ptyp)
4473 and then Convention (Ptyp) = Convention_Fortran
4475 Rewrite (N, New_Occurrence_Of (Standard_True, Loc));
4477 -- For biased representations, we will be doing an unchecked
4478 -- conversion without unbiasing the result. That means that the range
4479 -- test has to take this into account, and the proper form of the
4482 -- Btyp!(Pref) < Btyp!(Ptyp'Range_Length)
4484 elsif Has_Biased_Representation (Ptyp) then
4485 Btyp := RTE (RE_Unsigned_32);
4489 Unchecked_Convert_To (Btyp, Duplicate_Subexpr (Pref)),
4491 Unchecked_Convert_To (Btyp,
4492 Make_Attribute_Reference (Loc,
4493 Prefix => New_Occurrence_Of (Ptyp, Loc),
4494 Attribute_Name => Name_Range_Length))));
4496 -- For all other scalar types, what we want logically is a
4499 -- X in type(X)'First .. type(X)'Last
4501 -- But that's precisely what won't work because of possible
4502 -- unwanted optimization (and indeed the basic motivation for
4503 -- the Valid attribute is exactly that this test does not work!)
4504 -- What will work is:
4506 -- Btyp!(X) >= Btyp!(type(X)'First)
4508 -- Btyp!(X) <= Btyp!(type(X)'Last)
4510 -- where Btyp is an integer type large enough to cover the full
4511 -- range of possible stored values (i.e. it is chosen on the basis
4512 -- of the size of the type, not the range of the values). We write
4513 -- this as two tests, rather than a range check, so that static
4514 -- evaluation will easily remove either or both of the checks if
4515 -- they can be -statically determined to be true (this happens
4516 -- when the type of X is static and the range extends to the full
4517 -- range of stored values).
4519 -- Unsigned types. Note: it is safe to consider only whether the
4520 -- subtype is unsigned, since we will in that case be doing all
4521 -- unsigned comparisons based on the subtype range. Since we use the
4522 -- actual subtype object size, this is appropriate.
4524 -- For example, if we have
4526 -- subtype x is integer range 1 .. 200;
4527 -- for x'Object_Size use 8;
4529 -- Now the base type is signed, but objects of this type are bits
4530 -- unsigned, and doing an unsigned test of the range 1 to 200 is
4531 -- correct, even though a value greater than 127 looks signed to a
4532 -- signed comparison.
4534 elsif Is_Unsigned_Type (Ptyp) then
4535 if Esize (Ptyp) <= 32 then
4536 Btyp := RTE (RE_Unsigned_32);
4538 Btyp := RTE (RE_Unsigned_64);
4541 Rewrite (N, Make_Range_Test);
4546 if Esize (Ptyp) <= Esize (Standard_Integer) then
4547 Btyp := Standard_Integer;
4549 Btyp := Universal_Integer;
4552 Rewrite (N, Make_Range_Test);
4555 Analyze_And_Resolve (N, Standard_Boolean);
4556 Validity_Checks_On := Save_Validity_Checks_On;
4563 -- Value attribute is handled in separate unti Exp_Imgv
4565 when Attribute_Value =>
4566 Exp_Imgv.Expand_Value_Attribute (N);
4572 -- The processing for Value_Size shares the processing for Size
4578 -- The processing for Version shares the processing for Body_Version
4584 -- We expand typ'Wide_Image (X) into
4586 -- String_To_Wide_String
4587 -- (typ'Image (X), Wide_Character_Encoding_Method)
4589 -- This works in all cases because String_To_Wide_String converts any
4590 -- wide character escape sequences resulting from the Image call to the
4591 -- proper Wide_Character equivalent
4593 -- not quite right for typ = Wide_Character ???
4595 when Attribute_Wide_Image => Wide_Image :
4598 Make_Function_Call (Loc,
4599 Name => New_Reference_To (RTE (RE_String_To_Wide_String), Loc),
4600 Parameter_Associations => New_List (
4601 Make_Attribute_Reference (Loc,
4603 Attribute_Name => Name_Image,
4604 Expressions => Exprs),
4606 Make_Integer_Literal (Loc,
4607 Intval => Int (Wide_Character_Encoding_Method)))));
4609 Analyze_And_Resolve (N, Standard_Wide_String);
4612 ---------------------
4613 -- Wide_Wide_Image --
4614 ---------------------
4616 -- We expand typ'Wide_Wide_Image (X) into
4618 -- String_To_Wide_Wide_String
4619 -- (typ'Image (X), Wide_Character_Encoding_Method)
4621 -- This works in all cases because String_To_Wide_Wide_String converts
4622 -- any wide character escape sequences resulting from the Image call to
4623 -- the proper Wide_Character equivalent
4625 -- not quite right for typ = Wide_Wide_Character ???
4627 when Attribute_Wide_Wide_Image => Wide_Wide_Image :
4630 Make_Function_Call (Loc,
4631 Name => New_Reference_To
4632 (RTE (RE_String_To_Wide_Wide_String), Loc),
4633 Parameter_Associations => New_List (
4634 Make_Attribute_Reference (Loc,
4636 Attribute_Name => Name_Image,
4637 Expressions => Exprs),
4639 Make_Integer_Literal (Loc,
4640 Intval => Int (Wide_Character_Encoding_Method)))));
4642 Analyze_And_Resolve (N, Standard_Wide_Wide_String);
4643 end Wide_Wide_Image;
4649 -- We expand typ'Wide_Value (X) into
4652 -- (Wide_String_To_String (X, Wide_Character_Encoding_Method))
4654 -- Wide_String_To_String is a runtime function that converts its wide
4655 -- string argument to String, converting any non-translatable characters
4656 -- into appropriate escape sequences. This preserves the required
4657 -- semantics of Wide_Value in all cases, and results in a very simple
4658 -- implementation approach.
4660 -- Note: for this approach to be fully standard compliant for the cases
4661 -- where typ is Wide_Character and Wide_Wide_Character, the encoding
4662 -- method must cover the entire character range (e.g. UTF-8). But that
4663 -- is a reasonable requirement when dealing with encoded character
4664 -- sequences. Presumably if one of the restrictive encoding mechanisms
4665 -- is in use such as Shift-JIS, then characters that cannot be
4666 -- represented using this encoding will not appear in any case.
4668 when Attribute_Wide_Value => Wide_Value :
4671 Make_Attribute_Reference (Loc,
4673 Attribute_Name => Name_Value,
4675 Expressions => New_List (
4676 Make_Function_Call (Loc,
4678 New_Reference_To (RTE (RE_Wide_String_To_String), Loc),
4680 Parameter_Associations => New_List (
4681 Relocate_Node (First (Exprs)),
4682 Make_Integer_Literal (Loc,
4683 Intval => Int (Wide_Character_Encoding_Method)))))));
4685 Analyze_And_Resolve (N, Typ);
4688 ---------------------
4689 -- Wide_Wide_Value --
4690 ---------------------
4692 -- We expand typ'Wide_Value_Value (X) into
4695 -- (Wide_Wide_String_To_String (X, Wide_Character_Encoding_Method))
4697 -- Wide_Wide_String_To_String is a runtime function that converts its
4698 -- wide string argument to String, converting any non-translatable
4699 -- characters into appropriate escape sequences. This preserves the
4700 -- required semantics of Wide_Wide_Value in all cases, and results in a
4701 -- very simple implementation approach.
4703 -- It's not quite right where typ = Wide_Wide_Character, because the
4704 -- encoding method may not cover the whole character type ???
4706 when Attribute_Wide_Wide_Value => Wide_Wide_Value :
4709 Make_Attribute_Reference (Loc,
4711 Attribute_Name => Name_Value,
4713 Expressions => New_List (
4714 Make_Function_Call (Loc,
4716 New_Reference_To (RTE (RE_Wide_Wide_String_To_String), Loc),
4718 Parameter_Associations => New_List (
4719 Relocate_Node (First (Exprs)),
4720 Make_Integer_Literal (Loc,
4721 Intval => Int (Wide_Character_Encoding_Method)))))));
4723 Analyze_And_Resolve (N, Typ);
4724 end Wide_Wide_Value;
4726 ---------------------
4727 -- Wide_Wide_Width --
4728 ---------------------
4730 -- Wide_Wide_Width attribute is handled in separate unit Exp_Imgv
4732 when Attribute_Wide_Wide_Width =>
4733 Exp_Imgv.Expand_Width_Attribute (N, Wide_Wide);
4739 -- Wide_Width attribute is handled in separate unit Exp_Imgv
4741 when Attribute_Wide_Width =>
4742 Exp_Imgv.Expand_Width_Attribute (N, Wide);
4748 -- Width attribute is handled in separate unit Exp_Imgv
4750 when Attribute_Width =>
4751 Exp_Imgv.Expand_Width_Attribute (N, Normal);
4757 when Attribute_Write => Write : declare
4758 P_Type : constant Entity_Id := Entity (Pref);
4759 U_Type : constant Entity_Id := Underlying_Type (P_Type);
4767 -- If no underlying type, we have an error that will be diagnosed
4768 -- elsewhere, so here we just completely ignore the expansion.
4774 -- The simple case, if there is a TSS for Write, just call it
4776 Pname := Find_Stream_Subprogram (P_Type, TSS_Stream_Write);
4778 if Present (Pname) then
4782 -- If there is a Stream_Convert pragma, use it, we rewrite
4784 -- sourcetyp'Output (stream, Item)
4788 -- strmtyp'Output (Stream, strmwrite (acttyp (Item)));
4790 -- where strmwrite is the given Write function that converts an
4791 -- argument of type sourcetyp or a type acctyp, from which it is
4792 -- derived to type strmtyp. The conversion to acttyp is required
4793 -- for the derived case.
4795 Prag := Get_Stream_Convert_Pragma (P_Type);
4797 if Present (Prag) then
4799 Next (Next (First (Pragma_Argument_Associations (Prag))));
4800 Wfunc := Entity (Expression (Arg3));
4803 Make_Attribute_Reference (Loc,
4804 Prefix => New_Occurrence_Of (Etype (Wfunc), Loc),
4805 Attribute_Name => Name_Output,
4806 Expressions => New_List (
4807 Relocate_Node (First (Exprs)),
4808 Make_Function_Call (Loc,
4809 Name => New_Occurrence_Of (Wfunc, Loc),
4810 Parameter_Associations => New_List (
4811 OK_Convert_To (Etype (First_Formal (Wfunc)),
4812 Relocate_Node (Next (First (Exprs)))))))));
4817 -- For elementary types, we call the W_xxx routine directly
4819 elsif Is_Elementary_Type (U_Type) then
4820 Rewrite (N, Build_Elementary_Write_Call (N));
4826 elsif Is_Array_Type (U_Type) then
4827 Build_Array_Write_Procedure (N, U_Type, Decl, Pname);
4828 Compile_Stream_Body_In_Scope (N, Decl, U_Type, Check => False);
4830 -- Tagged type case, use the primitive Write function. Note that
4831 -- this will dispatch in the class-wide case which is what we want
4833 elsif Is_Tagged_Type (U_Type) then
4834 Pname := Find_Prim_Op (U_Type, TSS_Stream_Write);
4836 -- All other record type cases, including protected records.
4837 -- The latter only arise for expander generated code for
4838 -- handling shared passive partition access.
4842 (Is_Record_Type (U_Type) or else Is_Protected_Type (U_Type));
4844 -- Ada 2005 (AI-216): Program_Error is raised when executing
4845 -- the default implementation of the Write attribute of an
4846 -- Unchecked_Union type. However, if the 'Write reference is
4847 -- within the generated Output stream procedure, Write outputs
4848 -- the components, and the default values of the discriminant
4849 -- are streamed by the Output procedure itself.
4851 if Is_Unchecked_Union (Base_Type (U_Type))
4852 and not Is_TSS (Current_Scope, TSS_Stream_Output)
4855 Make_Raise_Program_Error (Loc,
4856 Reason => PE_Unchecked_Union_Restriction));
4859 if Has_Discriminants (U_Type)
4861 (Discriminant_Default_Value (First_Discriminant (U_Type)))
4863 Build_Mutable_Record_Write_Procedure
4864 (Loc, Base_Type (U_Type), Decl, Pname);
4866 Build_Record_Write_Procedure
4867 (Loc, Base_Type (U_Type), Decl, Pname);
4870 Insert_Action (N, Decl);
4874 -- If we fall through, Pname is the procedure to be called
4876 Rewrite_Stream_Proc_Call (Pname);
4879 -- Component_Size is handled by Gigi, unless the component size is known
4880 -- at compile time, which is always true in the packed array case. It is
4881 -- important that the packed array case is handled in the front end (see
4882 -- Eval_Attribute) since Gigi would otherwise get confused by the
4883 -- equivalent packed array type.
4885 when Attribute_Component_Size =>
4888 -- The following attributes are handled by the back end (except that
4889 -- static cases have already been evaluated during semantic processing,
4890 -- but in any case the back end should not count on this). The one bit
4891 -- of special processing required is that these attributes typically
4892 -- generate conditionals in the code, so we need to check the relevant
4895 when Attribute_Max |
4897 Check_Restriction (No_Implicit_Conditionals, N);
4899 -- The following attributes are handled by the back end (except that
4900 -- static cases have already been evaluated during semantic processing,
4901 -- but in any case the back end should not count on this).
4903 -- Gigi also handles the non-class-wide cases of Size
4905 when Attribute_Bit_Order |
4906 Attribute_Code_Address |
4907 Attribute_Definite |
4908 Attribute_Null_Parameter |
4909 Attribute_Passed_By_Reference |
4910 Attribute_Pool_Address =>
4913 -- The following attributes are also handled by Gigi, but return a
4914 -- universal integer result, so may need a conversion for checking
4915 -- that the result is in range.
4917 when Attribute_Aft |
4919 Attribute_Max_Size_In_Storage_Elements
4921 Apply_Universal_Integer_Attribute_Checks (N);
4923 -- The following attributes should not appear at this stage, since they
4924 -- have already been handled by the analyzer (and properly rewritten
4925 -- with corresponding values or entities to represent the right values)
4927 when Attribute_Abort_Signal |
4928 Attribute_Address_Size |
4931 Attribute_Default_Bit_Order |
4938 Attribute_Has_Access_Values |
4939 Attribute_Has_Discriminants |
4941 Attribute_Machine_Emax |
4942 Attribute_Machine_Emin |
4943 Attribute_Machine_Mantissa |
4944 Attribute_Machine_Overflows |
4945 Attribute_Machine_Radix |
4946 Attribute_Machine_Rounds |
4947 Attribute_Maximum_Alignment |
4948 Attribute_Model_Emin |
4949 Attribute_Model_Epsilon |
4950 Attribute_Model_Mantissa |
4951 Attribute_Model_Small |
4953 Attribute_Partition_ID |
4955 Attribute_Safe_Emax |
4956 Attribute_Safe_First |
4957 Attribute_Safe_Large |
4958 Attribute_Safe_Last |
4959 Attribute_Safe_Small |
4961 Attribute_Signed_Zeros |
4963 Attribute_Storage_Unit |
4964 Attribute_Stub_Type |
4965 Attribute_Target_Name |
4966 Attribute_Type_Class |
4967 Attribute_Unconstrained_Array |
4968 Attribute_Universal_Literal_String |
4969 Attribute_Wchar_T_Size |
4970 Attribute_Word_Size =>
4972 raise Program_Error;
4974 -- The Asm_Input and Asm_Output attributes are not expanded at this
4975 -- stage, but will be eliminated in the expansion of the Asm call,
4976 -- see Exp_Intr for details. So Gigi will never see these either.
4978 when Attribute_Asm_Input |
4979 Attribute_Asm_Output =>
4986 when RE_Not_Available =>
4988 end Expand_N_Attribute_Reference;
4990 ----------------------
4991 -- Expand_Pred_Succ --
4992 ----------------------
4994 -- For typ'Pred (exp), we generate the check
4996 -- [constraint_error when exp = typ'Base'First]
4998 -- Similarly, for typ'Succ (exp), we generate the check
5000 -- [constraint_error when exp = typ'Base'Last]
5002 -- These checks are not generated for modular types, since the proper
5003 -- semantics for Succ and Pred on modular types is to wrap, not raise CE.
5005 procedure Expand_Pred_Succ (N : Node_Id) is
5006 Loc : constant Source_Ptr := Sloc (N);
5010 if Attribute_Name (N) = Name_Pred then
5017 Make_Raise_Constraint_Error (Loc,
5021 Duplicate_Subexpr_Move_Checks (First (Expressions (N))),
5023 Make_Attribute_Reference (Loc,
5025 New_Reference_To (Base_Type (Etype (Prefix (N))), Loc),
5026 Attribute_Name => Cnam)),
5027 Reason => CE_Overflow_Check_Failed));
5028 end Expand_Pred_Succ;
5034 procedure Find_Fat_Info
5036 Fat_Type : out Entity_Id;
5037 Fat_Pkg : out RE_Id)
5039 Btyp : constant Entity_Id := Base_Type (T);
5040 Rtyp : constant Entity_Id := Root_Type (T);
5041 Digs : constant Nat := UI_To_Int (Digits_Value (Btyp));
5044 -- If the base type is VAX float, then get appropriate VAX float type
5046 if Vax_Float (Btyp) then
5049 Fat_Type := RTE (RE_Fat_VAX_F);
5050 Fat_Pkg := RE_Attr_VAX_F_Float;
5053 Fat_Type := RTE (RE_Fat_VAX_D);
5054 Fat_Pkg := RE_Attr_VAX_D_Float;
5057 Fat_Type := RTE (RE_Fat_VAX_G);
5058 Fat_Pkg := RE_Attr_VAX_G_Float;
5061 raise Program_Error;
5064 -- If root type is VAX float, this is the case where the library has
5065 -- been recompiled in VAX float mode, and we have an IEEE float type.
5066 -- This is when we use the special IEEE Fat packages.
5068 elsif Vax_Float (Rtyp) then
5071 Fat_Type := RTE (RE_Fat_IEEE_Short);
5072 Fat_Pkg := RE_Attr_IEEE_Short;
5075 Fat_Type := RTE (RE_Fat_IEEE_Long);
5076 Fat_Pkg := RE_Attr_IEEE_Long;
5079 raise Program_Error;
5082 -- If neither the base type nor the root type is VAX_Float then VAX
5083 -- float is out of the picture, and we can just use the root type.
5088 if Fat_Type = Standard_Short_Float then
5089 Fat_Pkg := RE_Attr_Short_Float;
5091 elsif Fat_Type = Standard_Float then
5092 Fat_Pkg := RE_Attr_Float;
5094 elsif Fat_Type = Standard_Long_Float then
5095 Fat_Pkg := RE_Attr_Long_Float;
5097 elsif Fat_Type = Standard_Long_Long_Float then
5098 Fat_Pkg := RE_Attr_Long_Long_Float;
5100 -- Universal real (which is its own root type) is treated as being
5101 -- equivalent to Standard.Long_Long_Float, since it is defined to
5102 -- have the same precision as the longest Float type.
5104 elsif Fat_Type = Universal_Real then
5105 Fat_Type := Standard_Long_Long_Float;
5106 Fat_Pkg := RE_Attr_Long_Long_Float;
5109 raise Program_Error;
5114 ----------------------------
5115 -- Find_Stream_Subprogram --
5116 ----------------------------
5118 function Find_Stream_Subprogram
5120 Nam : TSS_Name_Type) return Entity_Id
5122 Ent : constant Entity_Id := TSS (Typ, Nam);
5124 if Present (Ent) then
5128 if Is_Tagged_Type (Typ)
5129 and then Is_Derived_Type (Typ)
5131 return Find_Prim_Op (Typ, Nam);
5133 return Find_Inherited_TSS (Typ, Nam);
5135 end Find_Stream_Subprogram;
5137 -----------------------
5138 -- Get_Index_Subtype --
5139 -----------------------
5141 function Get_Index_Subtype (N : Node_Id) return Node_Id is
5142 P_Type : Entity_Id := Etype (Prefix (N));
5147 if Is_Access_Type (P_Type) then
5148 P_Type := Designated_Type (P_Type);
5151 if No (Expressions (N)) then
5154 J := UI_To_Int (Expr_Value (First (Expressions (N))));
5157 Indx := First_Index (P_Type);
5163 return Etype (Indx);
5164 end Get_Index_Subtype;
5166 -------------------------------
5167 -- Get_Stream_Convert_Pragma --
5168 -------------------------------
5170 function Get_Stream_Convert_Pragma (T : Entity_Id) return Node_Id is
5175 -- Note: we cannot use Get_Rep_Pragma here because of the peculiarity
5176 -- that a stream convert pragma for a tagged type is not inherited from
5177 -- its parent. Probably what is wrong here is that it is basically
5178 -- incorrect to consider a stream convert pragma to be a representation
5179 -- pragma at all ???
5181 N := First_Rep_Item (Implementation_Base_Type (T));
5182 while Present (N) loop
5183 if Nkind (N) = N_Pragma and then Chars (N) = Name_Stream_Convert then
5185 -- For tagged types this pragma is not inherited, so we
5186 -- must verify that it is defined for the given type and
5190 Entity (Expression (First (Pragma_Argument_Associations (N))));
5192 if not Is_Tagged_Type (T)
5194 or else (Is_Private_Type (Typ) and then T = Full_View (Typ))
5204 end Get_Stream_Convert_Pragma;
5206 ---------------------------------
5207 -- Is_Constrained_Packed_Array --
5208 ---------------------------------
5210 function Is_Constrained_Packed_Array (Typ : Entity_Id) return Boolean is
5211 Arr : Entity_Id := Typ;
5214 if Is_Access_Type (Arr) then
5215 Arr := Designated_Type (Arr);
5218 return Is_Array_Type (Arr)
5219 and then Is_Constrained (Arr)
5220 and then Present (Packed_Array_Type (Arr));
5221 end Is_Constrained_Packed_Array;
5223 ----------------------------------------
5224 -- Is_Inline_Floating_Point_Attribute --
5225 ----------------------------------------
5227 function Is_Inline_Floating_Point_Attribute (N : Node_Id) return Boolean is
5228 Id : constant Attribute_Id := Get_Attribute_Id (Attribute_Name (N));
5231 if Nkind (Parent (N)) /= N_Type_Conversion
5232 or else not Is_Integer_Type (Etype (Parent (N)))
5237 -- Should also support 'Machine_Rounding and 'Unbiased_Rounding, but
5238 -- required back end support has not been implemented yet ???
5240 return Id = Attribute_Truncation;
5241 end Is_Inline_Floating_Point_Attribute;