1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2003, 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, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, 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 Errout; use Errout;
32 with Exp_Aggr; use Exp_Aggr;
33 with Exp_Ch3; use Exp_Ch3;
34 with Exp_Ch7; use Exp_Ch7;
35 with Exp_Ch9; use Exp_Ch9;
36 with Exp_Disp; use Exp_Disp;
37 with Exp_Fixd; use Exp_Fixd;
38 with Exp_Pakd; use Exp_Pakd;
39 with Exp_Tss; use Exp_Tss;
40 with Exp_Util; use Exp_Util;
41 with Exp_VFpt; use Exp_VFpt;
42 with Hostparm; use Hostparm;
43 with Inline; use Inline;
44 with Nlists; use Nlists;
45 with Nmake; use Nmake;
47 with Rtsfind; use Rtsfind;
49 with Sem_Cat; use Sem_Cat;
50 with Sem_Ch13; use Sem_Ch13;
51 with Sem_Eval; use Sem_Eval;
52 with Sem_Res; use Sem_Res;
53 with Sem_Type; use Sem_Type;
54 with Sem_Util; use Sem_Util;
55 with Sem_Warn; use Sem_Warn;
56 with Sinfo; use Sinfo;
57 with Sinfo.CN; use Sinfo.CN;
58 with Snames; use Snames;
59 with Stand; use Stand;
60 with Targparm; use Targparm;
61 with Tbuild; use Tbuild;
62 with Ttypes; use Ttypes;
63 with Uintp; use Uintp;
64 with Urealp; use Urealp;
65 with Validsw; use Validsw;
67 package body Exp_Ch4 is
69 ------------------------
70 -- Local Subprograms --
71 ------------------------
73 procedure Binary_Op_Validity_Checks (N : Node_Id);
74 pragma Inline (Binary_Op_Validity_Checks);
75 -- Performs validity checks for a binary operator
77 procedure Build_Boolean_Array_Proc_Call
81 -- If an boolean array assignment can be done in place, build call to
82 -- corresponding library procedure.
84 procedure Expand_Allocator_Expression (N : Node_Id);
85 -- Subsidiary to Expand_N_Allocator, for the case when the expression
86 -- is a qualified expression or an aggregate.
88 procedure Expand_Array_Comparison (N : Node_Id);
89 -- This routine handles expansion of the comparison operators (N_Op_Lt,
90 -- N_Op_Le, N_Op_Gt, N_Op_Ge) when operating on an array type. The basic
91 -- code for these operators is similar, differing only in the details of
92 -- the actual comparison call that is made. Special processing (call a
95 function Expand_Array_Equality
103 -- Expand an array equality into a call to a function implementing this
104 -- equality, and a call to it. Loc is the location for the generated
105 -- nodes. Typ is the type of the array, and Lhs, Rhs are the array
106 -- expressions to be compared. A_Typ is the type of the arguments,
107 -- which may be a private type, in which case Typ is its full view.
108 -- Bodies is a list on which to attach bodies of local functions that
109 -- are created in the process. This is the responsibility of the
110 -- caller to insert those bodies at the right place. Nod provides
111 -- the Sloc value for the generated code.
113 procedure Expand_Boolean_Operator (N : Node_Id);
114 -- Common expansion processing for Boolean operators (And, Or, Xor)
115 -- for the case of array type arguments.
117 function Expand_Composite_Equality
124 -- Local recursive function used to expand equality for nested
125 -- composite types. Used by Expand_Record/Array_Equality, Bodies
126 -- is a list on which to attach bodies of local functions that are
127 -- created in the process. This is the responsability of the caller
128 -- to insert those bodies at the right place. Nod provides the Sloc
129 -- value for generated code.
131 procedure Expand_Concatenate_Other (Cnode : Node_Id; Opnds : List_Id);
132 -- This routine handles expansion of concatenation operations, where
133 -- N is the N_Op_Concat node being expanded and Operands is the list
134 -- of operands (at least two are present). The caller has dealt with
135 -- converting any singleton operands into singleton aggregates.
137 procedure Expand_Concatenate_String (Cnode : Node_Id; Opnds : List_Id);
138 -- Routine to expand concatenation of 2-5 operands (in the list Operands)
139 -- and replace node Cnode with the result of the contatenation. If there
140 -- are two operands, they can be string or character. If there are more
141 -- than two operands, then are always of type string (i.e. the caller has
142 -- already converted character operands to strings in this case).
144 procedure Fixup_Universal_Fixed_Operation (N : Node_Id);
145 -- N is either an N_Op_Divide or N_Op_Multiply node whose result is
146 -- universal fixed. We do not have such a type at runtime, so the
147 -- purpose of this routine is to find the real type by looking up
148 -- the tree. We also determine if the operation must be rounded.
150 function Get_Allocator_Final_List
155 -- If the designated type is controlled, build final_list expression
156 -- for created object. If context is an access parameter, create a
157 -- local access type to have a usable finalization list.
159 procedure Insert_Dereference_Action (N : Node_Id);
160 -- N is an expression whose type is an access. When the type is derived
161 -- from Checked_Pool, expands a call to the primitive 'dereference'.
163 function Make_Array_Comparison_Op
167 -- Comparisons between arrays are expanded in line. This function
168 -- produces the body of the implementation of (a > b), where a and b
169 -- are one-dimensional arrays of some discrete type. The original
170 -- node is then expanded into the appropriate call to this function.
171 -- Nod provides the Sloc value for the generated code.
173 function Make_Boolean_Array_Op
177 -- Boolean operations on boolean arrays are expanded in line. This
178 -- function produce the body for the node N, which is (a and b),
179 -- (a or b), or (a xor b). It is used only the normal case and not
180 -- the packed case. The type involved, Typ, is the Boolean array type,
181 -- and the logical operations in the body are simple boolean operations.
182 -- Note that Typ is always a constrained type (the caller has ensured
183 -- this by using Convert_To_Actual_Subtype if necessary).
185 procedure Rewrite_Comparison (N : Node_Id);
186 -- N is the node for a compile time comparison. If this outcome of this
187 -- comparison can be determined at compile time, then the node N can be
188 -- rewritten with True or False. If the outcome cannot be determined at
189 -- compile time, the call has no effect.
191 function Tagged_Membership (N : Node_Id) return Node_Id;
192 -- Construct the expression corresponding to the tagged membership test.
193 -- Deals with a second operand being (or not) a class-wide type.
195 function Safe_In_Place_Array_Op
200 -- In the context of an assignment, where the right-hand side is a
201 -- boolean operation on arrays, check whether operation can be performed
204 procedure Unary_Op_Validity_Checks (N : Node_Id);
205 pragma Inline (Unary_Op_Validity_Checks);
206 -- Performs validity checks for a unary operator
208 -------------------------------
209 -- Binary_Op_Validity_Checks --
210 -------------------------------
212 procedure Binary_Op_Validity_Checks (N : Node_Id) is
214 if Validity_Checks_On and Validity_Check_Operands then
215 Ensure_Valid (Left_Opnd (N));
216 Ensure_Valid (Right_Opnd (N));
218 end Binary_Op_Validity_Checks;
220 ------------------------------------
221 -- Build_Boolean_Array_Proc_Call --
222 ------------------------------------
224 procedure Build_Boolean_Array_Proc_Call
229 Loc : constant Source_Ptr := Sloc (N);
230 Kind : constant Node_Kind := Nkind (Expression (N));
231 Target : constant Node_Id :=
232 Make_Attribute_Reference (Loc,
234 Attribute_Name => Name_Address);
236 Arg1 : constant Node_Id := Op1;
237 Arg2 : Node_Id := Op2;
239 Proc_Name : Entity_Id;
242 if Kind = N_Op_Not then
243 if Nkind (Op1) in N_Binary_Op then
245 -- Use negated version of the binary operators.
247 if Nkind (Op1) = N_Op_And then
248 Proc_Name := RTE (RE_Vector_Nand);
250 elsif Nkind (Op1) = N_Op_Or then
251 Proc_Name := RTE (RE_Vector_Nor);
253 else pragma Assert (Nkind (Op1) = N_Op_Xor);
254 Proc_Name := RTE (RE_Vector_Xor);
258 Make_Procedure_Call_Statement (Loc,
259 Name => New_Occurrence_Of (Proc_Name, Loc),
261 Parameter_Associations => New_List (
263 Make_Attribute_Reference (Loc,
264 Prefix => Left_Opnd (Op1),
265 Attribute_Name => Name_Address),
267 Make_Attribute_Reference (Loc,
268 Prefix => Right_Opnd (Op1),
269 Attribute_Name => Name_Address),
271 Make_Attribute_Reference (Loc,
272 Prefix => Left_Opnd (Op1),
273 Attribute_Name => Name_Length)));
276 Proc_Name := RTE (RE_Vector_Not);
279 Make_Procedure_Call_Statement (Loc,
280 Name => New_Occurrence_Of (Proc_Name, Loc),
281 Parameter_Associations => New_List (
284 Make_Attribute_Reference (Loc,
286 Attribute_Name => Name_Address),
288 Make_Attribute_Reference (Loc,
290 Attribute_Name => Name_Length)));
294 -- We use the following equivalences:
296 -- (not X) or (not Y) = not (X and Y) = Nand (X, Y)
297 -- (not X) and (not Y) = not (X or Y) = Nor (X, Y)
298 -- (not X) xor (not Y) = X xor Y
299 -- X xor (not Y) = not (X xor Y) = Nxor (X, Y)
301 if Nkind (Op1) = N_Op_Not then
302 if Kind = N_Op_And then
303 Proc_Name := RTE (RE_Vector_Nor);
305 elsif Kind = N_Op_Or then
306 Proc_Name := RTE (RE_Vector_Nand);
309 Proc_Name := RTE (RE_Vector_Xor);
313 if Kind = N_Op_And then
314 Proc_Name := RTE (RE_Vector_And);
316 elsif Kind = N_Op_Or then
317 Proc_Name := RTE (RE_Vector_Or);
319 elsif Nkind (Op2) = N_Op_Not then
320 Proc_Name := RTE (RE_Vector_Nxor);
321 Arg2 := Right_Opnd (Op2);
324 Proc_Name := RTE (RE_Vector_Xor);
329 Make_Procedure_Call_Statement (Loc,
330 Name => New_Occurrence_Of (Proc_Name, Loc),
331 Parameter_Associations => New_List (
333 Make_Attribute_Reference (Loc,
335 Attribute_Name => Name_Address),
336 Make_Attribute_Reference (Loc,
338 Attribute_Name => Name_Address),
339 Make_Attribute_Reference (Loc,
341 Attribute_Name => Name_Length)));
344 Rewrite (N, Call_Node);
348 when RE_Not_Available =>
350 end Build_Boolean_Array_Proc_Call;
352 ---------------------------------
353 -- Expand_Allocator_Expression --
354 ---------------------------------
356 procedure Expand_Allocator_Expression (N : Node_Id) is
357 Loc : constant Source_Ptr := Sloc (N);
358 Exp : constant Node_Id := Expression (Expression (N));
359 Indic : constant Node_Id := Subtype_Mark (Expression (N));
360 PtrT : constant Entity_Id := Etype (N);
361 T : constant Entity_Id := Entity (Indic);
366 Aggr_In_Place : constant Boolean := Is_Delayed_Aggregate (Exp);
368 Tag_Assign : Node_Id;
372 if Is_Tagged_Type (T) or else Controlled_Type (T) then
374 -- Actions inserted before:
375 -- Temp : constant ptr_T := new T'(Expression);
376 -- <no CW> Temp._tag := T'tag;
377 -- <CTRL> Adjust (Finalizable (Temp.all));
378 -- <CTRL> Attach_To_Final_List (Finalizable (Temp.all));
380 -- We analyze by hand the new internal allocator to avoid
381 -- any recursion and inappropriate call to Initialize
382 if not Aggr_In_Place then
383 Remove_Side_Effects (Exp);
387 Make_Defining_Identifier (Loc, New_Internal_Name ('P'));
389 -- For a class wide allocation generate the following code:
391 -- type Equiv_Record is record ... end record;
392 -- implicit subtype CW is <Class_Wide_Subytpe>;
393 -- temp : PtrT := new CW'(CW!(expr));
395 if Is_Class_Wide_Type (T) then
396 Expand_Subtype_From_Expr (Empty, T, Indic, Exp);
398 Set_Expression (Expression (N),
399 Unchecked_Convert_To (Entity (Indic), Exp));
401 Analyze_And_Resolve (Expression (N), Entity (Indic));
404 if Aggr_In_Place then
406 Make_Object_Declaration (Loc,
407 Defining_Identifier => Temp,
408 Object_Definition => New_Reference_To (PtrT, Loc),
411 New_Reference_To (Etype (Exp), Loc)));
413 Set_Comes_From_Source
414 (Expression (Tmp_Node), Comes_From_Source (N));
416 Set_No_Initialization (Expression (Tmp_Node));
417 Insert_Action (N, Tmp_Node);
419 if Controlled_Type (T)
420 and then Ekind (PtrT) = E_Anonymous_Access_Type
422 -- Create local finalization list for access parameter.
424 Flist := Get_Allocator_Final_List (N, Base_Type (T), PtrT);
427 Convert_Aggr_In_Allocator (Tmp_Node, Exp);
429 Node := Relocate_Node (N);
432 Make_Object_Declaration (Loc,
433 Defining_Identifier => Temp,
434 Constant_Present => True,
435 Object_Definition => New_Reference_To (PtrT, Loc),
436 Expression => Node));
439 -- Suppress the tag assignment when Java_VM because JVM tags
440 -- are represented implicitly in objects.
442 if Is_Tagged_Type (T)
443 and then not Is_Class_Wide_Type (T)
447 Make_Assignment_Statement (Loc,
449 Make_Selected_Component (Loc,
450 Prefix => New_Reference_To (Temp, Loc),
452 New_Reference_To (Tag_Component (T), Loc)),
455 Unchecked_Convert_To (RTE (RE_Tag),
456 New_Reference_To (Access_Disp_Table (T), Loc)));
458 -- The previous assignment has to be done in any case
460 Set_Assignment_OK (Name (Tag_Assign));
461 Insert_Action (N, Tag_Assign);
463 elsif Is_Private_Type (T)
464 and then Is_Tagged_Type (Underlying_Type (T))
468 Utyp : constant Entity_Id := Underlying_Type (T);
469 Ref : constant Node_Id :=
470 Unchecked_Convert_To (Utyp,
471 Make_Explicit_Dereference (Loc,
472 New_Reference_To (Temp, Loc)));
476 Make_Assignment_Statement (Loc,
478 Make_Selected_Component (Loc,
481 New_Reference_To (Tag_Component (Utyp), Loc)),
484 Unchecked_Convert_To (RTE (RE_Tag),
486 Access_Disp_Table (Utyp), Loc)));
488 Set_Assignment_OK (Name (Tag_Assign));
489 Insert_Action (N, Tag_Assign);
493 if Controlled_Type (Designated_Type (PtrT))
494 and then Controlled_Type (T)
498 Apool : constant Entity_Id :=
499 Associated_Storage_Pool (PtrT);
502 -- If it is an allocation on the secondary stack
503 -- (i.e. a value returned from a function), the object
504 -- is attached on the caller side as soon as the call
505 -- is completed (see Expand_Ctrl_Function_Call)
507 if Is_RTE (Apool, RE_SS_Pool) then
509 F : constant Entity_Id :=
510 Make_Defining_Identifier (Loc,
511 New_Internal_Name ('F'));
514 Make_Object_Declaration (Loc,
515 Defining_Identifier => F,
516 Object_Definition => New_Reference_To (RTE
517 (RE_Finalizable_Ptr), Loc)));
519 Flist := New_Reference_To (F, Loc);
520 Attach := Make_Integer_Literal (Loc, 1);
523 -- Normal case, not a secondary stack allocation
526 Flist := Find_Final_List (PtrT);
527 Attach := Make_Integer_Literal (Loc, 2);
530 if not Aggr_In_Place then
535 -- An unchecked conversion is needed in the
536 -- classwide case because the designated type
537 -- can be an ancestor of the subtype mark of
540 Unchecked_Convert_To (T,
541 Make_Explicit_Dereference (Loc,
542 New_Reference_To (Temp, Loc))),
546 With_Attach => Attach));
551 Rewrite (N, New_Reference_To (Temp, Loc));
552 Analyze_And_Resolve (N, PtrT);
554 elsif Aggr_In_Place then
556 Make_Defining_Identifier (Loc, New_Internal_Name ('P'));
558 Make_Object_Declaration (Loc,
559 Defining_Identifier => Temp,
560 Object_Definition => New_Reference_To (PtrT, Loc),
561 Expression => Make_Allocator (Loc,
562 New_Reference_To (Etype (Exp), Loc)));
564 Set_Comes_From_Source
565 (Expression (Tmp_Node), Comes_From_Source (N));
567 Set_No_Initialization (Expression (Tmp_Node));
568 Insert_Action (N, Tmp_Node);
569 Convert_Aggr_In_Allocator (Tmp_Node, Exp);
570 Rewrite (N, New_Reference_To (Temp, Loc));
571 Analyze_And_Resolve (N, PtrT);
573 elsif Is_Access_Type (Designated_Type (PtrT))
574 and then Nkind (Exp) = N_Allocator
575 and then Nkind (Expression (Exp)) /= N_Qualified_Expression
577 -- Apply constraint to designated subtype indication.
579 Apply_Constraint_Check (Expression (Exp),
580 Designated_Type (Designated_Type (PtrT)),
583 if Nkind (Expression (Exp)) = N_Raise_Constraint_Error then
585 -- Propagate constraint_error to enclosing allocator
587 Rewrite (Exp, New_Copy (Expression (Exp)));
590 -- First check against the type of the qualified expression
592 -- NOTE: The commented call should be correct, but for
593 -- some reason causes the compiler to bomb (sigsegv) on
594 -- ACVC test c34007g, so for now we just perform the old
595 -- (incorrect) test against the designated subtype with
596 -- no sliding in the else part of the if statement below.
599 -- Apply_Constraint_Check (Exp, T, No_Sliding => True);
601 -- A check is also needed in cases where the designated
602 -- subtype is constrained and differs from the subtype
603 -- given in the qualified expression. Note that the check
604 -- on the qualified expression does not allow sliding,
605 -- but this check does (a relaxation from Ada 83).
607 if Is_Constrained (Designated_Type (PtrT))
608 and then not Subtypes_Statically_Match
609 (T, Designated_Type (PtrT))
611 Apply_Constraint_Check
612 (Exp, Designated_Type (PtrT), No_Sliding => False);
614 -- The nonsliding check should really be performed
615 -- (unconditionally) against the subtype of the
616 -- qualified expression, but that causes a problem
617 -- with c34007g (see above), so for now we retain this.
620 Apply_Constraint_Check
621 (Exp, Designated_Type (PtrT), No_Sliding => True);
626 when RE_Not_Available =>
628 end Expand_Allocator_Expression;
630 -----------------------------
631 -- Expand_Array_Comparison --
632 -----------------------------
634 -- Expansion is only required in the case of array types. For the
635 -- unpacked case, an appropriate runtime routine is called. For
636 -- packed cases, and also in some other cases where a runtime
637 -- routine cannot be called, the form of the expansion is:
639 -- [body for greater_nn; boolean_expression]
641 -- The body is built by Make_Array_Comparison_Op, and the form of the
642 -- Boolean expression depends on the operator involved.
644 procedure Expand_Array_Comparison (N : Node_Id) is
645 Loc : constant Source_Ptr := Sloc (N);
646 Op1 : Node_Id := Left_Opnd (N);
647 Op2 : Node_Id := Right_Opnd (N);
648 Typ1 : constant Entity_Id := Base_Type (Etype (Op1));
649 Ctyp : constant Entity_Id := Component_Type (Typ1);
653 Func_Name : Entity_Id;
657 function Length_Less_Than_4 (Opnd : Node_Id) return Boolean;
658 -- Returns True if the length of the given operand is known to be
659 -- less than 4. Returns False if this length is known to be four
660 -- or greater or is not known at compile time.
662 ------------------------
663 -- Length_Less_Than_4 --
664 ------------------------
666 function Length_Less_Than_4 (Opnd : Node_Id) return Boolean is
667 Otyp : constant Entity_Id := Etype (Opnd);
670 if Ekind (Otyp) = E_String_Literal_Subtype then
671 return String_Literal_Length (Otyp) < 4;
675 Ityp : constant Entity_Id := Etype (First_Index (Otyp));
676 Lo : constant Node_Id := Type_Low_Bound (Ityp);
677 Hi : constant Node_Id := Type_High_Bound (Ityp);
682 if Compile_Time_Known_Value (Lo) then
683 Lov := Expr_Value (Lo);
688 if Compile_Time_Known_Value (Hi) then
689 Hiv := Expr_Value (Hi);
694 return Hiv < Lov + 3;
697 end Length_Less_Than_4;
699 -- Start of processing for Expand_Array_Comparison
702 -- Deal first with unpacked case, where we can call a runtime routine
703 -- except that we avoid this for targets for which are not addressable
704 -- by bytes, and for the JVM, since the JVM does not support direct
705 -- addressing of array components.
707 if not Is_Bit_Packed_Array (Typ1)
708 and then System_Storage_Unit = Byte'Size
711 -- The call we generate is:
713 -- Compare_Array_xn[_Unaligned]
714 -- (left'address, right'address, left'length, right'length) <op> 0
716 -- x = U for unsigned, S for signed
717 -- n = 8,16,32,64 for component size
718 -- Add _Unaligned if length < 4 and component size is 8.
719 -- <op> is the standard comparison operator
721 if Component_Size (Typ1) = 8 then
722 if Length_Less_Than_4 (Op1)
724 Length_Less_Than_4 (Op2)
726 if Is_Unsigned_Type (Ctyp) then
727 Comp := RE_Compare_Array_U8_Unaligned;
729 Comp := RE_Compare_Array_S8_Unaligned;
733 if Is_Unsigned_Type (Ctyp) then
734 Comp := RE_Compare_Array_U8;
736 Comp := RE_Compare_Array_S8;
740 elsif Component_Size (Typ1) = 16 then
741 if Is_Unsigned_Type (Ctyp) then
742 Comp := RE_Compare_Array_U16;
744 Comp := RE_Compare_Array_S16;
747 elsif Component_Size (Typ1) = 32 then
748 if Is_Unsigned_Type (Ctyp) then
749 Comp := RE_Compare_Array_U32;
751 Comp := RE_Compare_Array_S32;
754 else pragma Assert (Component_Size (Typ1) = 64);
755 if Is_Unsigned_Type (Ctyp) then
756 Comp := RE_Compare_Array_U64;
758 Comp := RE_Compare_Array_S64;
762 Remove_Side_Effects (Op1, Name_Req => True);
763 Remove_Side_Effects (Op2, Name_Req => True);
766 Make_Function_Call (Sloc (Op1),
767 Name => New_Occurrence_Of (RTE (Comp), Loc),
769 Parameter_Associations => New_List (
770 Make_Attribute_Reference (Loc,
771 Prefix => Relocate_Node (Op1),
772 Attribute_Name => Name_Address),
774 Make_Attribute_Reference (Loc,
775 Prefix => Relocate_Node (Op2),
776 Attribute_Name => Name_Address),
778 Make_Attribute_Reference (Loc,
779 Prefix => Relocate_Node (Op1),
780 Attribute_Name => Name_Length),
782 Make_Attribute_Reference (Loc,
783 Prefix => Relocate_Node (Op2),
784 Attribute_Name => Name_Length))));
787 Make_Integer_Literal (Sloc (Op2),
790 Analyze_And_Resolve (Op1, Standard_Integer);
791 Analyze_And_Resolve (Op2, Standard_Integer);
795 -- Cases where we cannot make runtime call
797 -- For (a <= b) we convert to not (a > b)
799 if Chars (N) = Name_Op_Le then
805 Right_Opnd => Op2)));
806 Analyze_And_Resolve (N, Standard_Boolean);
809 -- For < the Boolean expression is
810 -- greater__nn (op2, op1)
812 elsif Chars (N) = Name_Op_Lt then
813 Func_Body := Make_Array_Comparison_Op (Typ1, N);
817 Op1 := Right_Opnd (N);
818 Op2 := Left_Opnd (N);
820 -- For (a >= b) we convert to not (a < b)
822 elsif Chars (N) = Name_Op_Ge then
828 Right_Opnd => Op2)));
829 Analyze_And_Resolve (N, Standard_Boolean);
832 -- For > the Boolean expression is
833 -- greater__nn (op1, op2)
836 pragma Assert (Chars (N) = Name_Op_Gt);
837 Func_Body := Make_Array_Comparison_Op (Typ1, N);
840 Func_Name := Defining_Unit_Name (Specification (Func_Body));
842 Make_Function_Call (Loc,
843 Name => New_Reference_To (Func_Name, Loc),
844 Parameter_Associations => New_List (Op1, Op2));
846 Insert_Action (N, Func_Body);
848 Analyze_And_Resolve (N, Standard_Boolean);
851 when RE_Not_Available =>
853 end Expand_Array_Comparison;
855 ---------------------------
856 -- Expand_Array_Equality --
857 ---------------------------
859 -- Expand an equality function for multi-dimensional arrays. Here is
860 -- an example of such a function for Nb_Dimension = 2
862 -- function Enn (A : arr; B : arr) return boolean is
864 -- if (A'length (1) = 0 or else A'length (2) = 0)
866 -- (B'length (1) = 0 or else B'length (2) = 0)
868 -- return True; -- RM 4.5.2(22)
871 -- if A'length (1) /= B'length (1)
873 -- A'length (2) /= B'length (2)
875 -- return False; -- RM 4.5.2(23)
879 -- A1 : Index_type_1 := A'first (1)
880 -- B1 : Index_Type_1 := B'first (1)
884 -- A2 : Index_type_2 := A'first (2);
885 -- B2 : Index_type_2 := B'first (2)
888 -- if A (A1, A2) /= B (B1, B2) then
892 -- exit when A2 = A'last (2);
893 -- A2 := Index_type2'succ (A2);
894 -- B2 := Index_type2'succ (B2);
898 -- exit when A1 = A'last (1);
899 -- A1 := Index_type1'succ (A1);
900 -- B1 := Index_type1'succ (B1);
907 function Expand_Array_Equality
916 Loc : constant Source_Ptr := Sloc (Nod);
917 Decls : constant List_Id := New_List;
918 Index_List1 : constant List_Id := New_List;
919 Index_List2 : constant List_Id := New_List;
923 Func_Name : Entity_Id;
926 A : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uA);
927 B : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uB);
934 -- This builds the attribute reference Arr'Nam (Expr).
936 function Component_Equality (Typ : Entity_Id) return Node_Id;
937 -- Create one statement to compare corresponding components,
938 -- designated by a full set of indices.
940 function Handle_One_Dimension
944 -- This procedure returns a declare block:
947 -- An : Index_Type_n := A'First (n);
948 -- Bn : Index_Type_n := B'First (n);
952 -- exit when An = A'Last (n);
953 -- An := Index_Type_n'Succ (An)
954 -- Bn := Index_Type_n'Succ (Bn)
958 -- where N is the value of "n" in the above code. Index is the
959 -- N'th index node, whose Etype is Index_Type_n in the above code.
960 -- The xxx statement is either the declare block for the next
961 -- dimension or if this is the last dimension the comparison
962 -- of corresponding components of the arrays.
964 -- The actual way the code works is to return the comparison
965 -- of corresponding components for the N+1 call. That's neater!
967 function Test_Empty_Arrays return Node_Id;
968 -- This function constructs the test for both arrays being empty
969 -- (A'length (1) = 0 or else A'length (2) = 0 or else ...)
971 -- (B'length (1) = 0 or else B'length (2) = 0 or else ...)
973 function Test_Lengths_Correspond return Node_Id;
974 -- This function constructs the test for arrays having different
975 -- lengths in at least one index position, in which case resull
977 -- A'length (1) /= B'length (1)
979 -- A'length (2) /= B'length (2)
995 Make_Attribute_Reference (Loc,
996 Attribute_Name => Nam,
997 Prefix => New_Reference_To (Arr, Loc),
998 Expressions => New_List (Make_Integer_Literal (Loc, Num)));
1001 ------------------------
1002 -- Component_Equality --
1003 ------------------------
1005 function Component_Equality (Typ : Entity_Id) return Node_Id is
1010 -- if a(i1...) /= b(j1...) then return false; end if;
1013 Make_Indexed_Component (Loc,
1014 Prefix => Make_Identifier (Loc, Chars (A)),
1015 Expressions => Index_List1);
1018 Make_Indexed_Component (Loc,
1019 Prefix => Make_Identifier (Loc, Chars (B)),
1020 Expressions => Index_List2);
1022 Test := Expand_Composite_Equality
1023 (Nod, Component_Type (Typ), L, R, Decls);
1026 Make_Implicit_If_Statement (Nod,
1027 Condition => Make_Op_Not (Loc, Right_Opnd => Test),
1028 Then_Statements => New_List (
1029 Make_Return_Statement (Loc,
1030 Expression => New_Occurrence_Of (Standard_False, Loc))));
1031 end Component_Equality;
1033 --------------------------
1034 -- Handle_One_Dimension --
1035 ---------------------------
1037 function Handle_One_Dimension
1042 An : constant Entity_Id := Make_Defining_Identifier (Loc,
1043 Chars => New_Internal_Name ('A'));
1044 Bn : constant Entity_Id := Make_Defining_Identifier (Loc,
1045 Chars => New_Internal_Name ('B'));
1046 Index_Type_n : Entity_Id;
1049 if N > Number_Dimensions (Typ) then
1050 return Component_Equality (Typ);
1053 -- Case where we generate a declare block
1055 Index_Type_n := Base_Type (Etype (Index));
1056 Append (New_Reference_To (An, Loc), Index_List1);
1057 Append (New_Reference_To (Bn, Loc), Index_List2);
1060 Make_Block_Statement (Loc,
1061 Declarations => New_List (
1062 Make_Object_Declaration (Loc,
1063 Defining_Identifier => An,
1064 Object_Definition =>
1065 New_Reference_To (Index_Type_n, Loc),
1066 Expression => Arr_Attr (A, Name_First, N)),
1068 Make_Object_Declaration (Loc,
1069 Defining_Identifier => Bn,
1070 Object_Definition =>
1071 New_Reference_To (Index_Type_n, Loc),
1072 Expression => Arr_Attr (B, Name_First, N))),
1074 Handled_Statement_Sequence =>
1075 Make_Handled_Sequence_Of_Statements (Loc,
1076 Statements => New_List (
1077 Make_Implicit_Loop_Statement (Nod,
1078 Statements => New_List (
1079 Handle_One_Dimension (N + 1, Next_Index (Index)),
1081 Make_Exit_Statement (Loc,
1084 Left_Opnd => New_Reference_To (An, Loc),
1085 Right_Opnd => Arr_Attr (A, Name_Last, N))),
1087 Make_Assignment_Statement (Loc,
1088 Name => New_Reference_To (An, Loc),
1090 Make_Attribute_Reference (Loc,
1092 New_Reference_To (Index_Type_n, Loc),
1093 Attribute_Name => Name_Succ,
1094 Expressions => New_List (
1095 New_Reference_To (An, Loc)))),
1097 Make_Assignment_Statement (Loc,
1098 Name => New_Reference_To (Bn, Loc),
1100 Make_Attribute_Reference (Loc,
1102 New_Reference_To (Index_Type_n, Loc),
1103 Attribute_Name => Name_Succ,
1104 Expressions => New_List (
1105 New_Reference_To (Bn, Loc)))))))));
1106 end Handle_One_Dimension;
1108 -----------------------
1109 -- Test_Empty_Arrays --
1110 -----------------------
1112 function Test_Empty_Arrays return Node_Id is
1122 for J in 1 .. Number_Dimensions (Typ) loop
1125 Left_Opnd => Arr_Attr (A, Name_Length, J),
1126 Right_Opnd => Make_Integer_Literal (Loc, 0));
1130 Left_Opnd => Arr_Attr (B, Name_Length, J),
1131 Right_Opnd => Make_Integer_Literal (Loc, 0));
1140 Left_Opnd => Relocate_Node (Alist),
1141 Right_Opnd => Atest);
1145 Left_Opnd => Relocate_Node (Blist),
1146 Right_Opnd => Btest);
1153 Right_Opnd => Blist);
1154 end Test_Empty_Arrays;
1156 -----------------------------
1157 -- Test_Lengths_Correspond --
1158 -----------------------------
1160 function Test_Lengths_Correspond return Node_Id is
1166 for J in 1 .. Number_Dimensions (Typ) loop
1169 Left_Opnd => Arr_Attr (A, Name_Length, J),
1170 Right_Opnd => Arr_Attr (B, Name_Length, J));
1177 Left_Opnd => Relocate_Node (Result),
1178 Right_Opnd => Rtest);
1183 end Test_Lengths_Correspond;
1185 -- Start of processing for Expand_Array_Equality
1188 Formals := New_List (
1189 Make_Parameter_Specification (Loc,
1190 Defining_Identifier => A,
1191 Parameter_Type => New_Reference_To (Typ, Loc)),
1193 Make_Parameter_Specification (Loc,
1194 Defining_Identifier => B,
1195 Parameter_Type => New_Reference_To (Typ, Loc)));
1197 Func_Name := Make_Defining_Identifier (Loc, New_Internal_Name ('E'));
1199 -- Build statement sequence for function
1202 Make_Subprogram_Body (Loc,
1204 Make_Function_Specification (Loc,
1205 Defining_Unit_Name => Func_Name,
1206 Parameter_Specifications => Formals,
1207 Subtype_Mark => New_Reference_To (Standard_Boolean, Loc)),
1209 Declarations => Decls,
1211 Handled_Statement_Sequence =>
1212 Make_Handled_Sequence_Of_Statements (Loc,
1213 Statements => New_List (
1215 Make_Implicit_If_Statement (Nod,
1216 Condition => Test_Empty_Arrays,
1217 Then_Statements => New_List (
1218 Make_Return_Statement (Loc,
1220 New_Occurrence_Of (Standard_True, Loc)))),
1222 Make_Implicit_If_Statement (Nod,
1223 Condition => Test_Lengths_Correspond,
1224 Then_Statements => New_List (
1225 Make_Return_Statement (Loc,
1227 New_Occurrence_Of (Standard_False, Loc)))),
1229 Handle_One_Dimension (1, First_Index (Typ)),
1231 Make_Return_Statement (Loc,
1232 Expression => New_Occurrence_Of (Standard_True, Loc)))));
1234 Set_Has_Completion (Func_Name, True);
1236 -- If the array type is distinct from the type of the arguments,
1237 -- it is the full view of a private type. Apply an unchecked
1238 -- conversion to insure that analysis of the call succeeds.
1240 if Base_Type (A_Typ) /= Base_Type (Typ) then
1241 Actuals := New_List (
1242 OK_Convert_To (Typ, Lhs),
1243 OK_Convert_To (Typ, Rhs));
1245 Actuals := New_List (Lhs, Rhs);
1248 Append_To (Bodies, Func_Body);
1251 Make_Function_Call (Loc,
1252 Name => New_Reference_To (Func_Name, Loc),
1253 Parameter_Associations => Actuals);
1254 end Expand_Array_Equality;
1256 -----------------------------
1257 -- Expand_Boolean_Operator --
1258 -----------------------------
1260 -- Note that we first get the actual subtypes of the operands,
1261 -- since we always want to deal with types that have bounds.
1263 procedure Expand_Boolean_Operator (N : Node_Id) is
1264 Typ : constant Entity_Id := Etype (N);
1267 if Is_Bit_Packed_Array (Typ) then
1268 Expand_Packed_Boolean_Operator (N);
1271 -- For the normal non-packed case, the general expansion is
1272 -- to build a function for carrying out the comparison (using
1273 -- Make_Boolean_Array_Op) and then inserting it into the tree.
1274 -- The original operator node is then rewritten as a call to
1278 Loc : constant Source_Ptr := Sloc (N);
1279 L : constant Node_Id := Relocate_Node (Left_Opnd (N));
1280 R : constant Node_Id := Relocate_Node (Right_Opnd (N));
1281 Func_Body : Node_Id;
1282 Func_Name : Entity_Id;
1285 Convert_To_Actual_Subtype (L);
1286 Convert_To_Actual_Subtype (R);
1287 Ensure_Defined (Etype (L), N);
1288 Ensure_Defined (Etype (R), N);
1289 Apply_Length_Check (R, Etype (L));
1291 if Nkind (Parent (N)) = N_Assignment_Statement
1292 and then Safe_In_Place_Array_Op (Name (Parent (N)), L, R)
1294 Build_Boolean_Array_Proc_Call (Parent (N), L, R);
1296 elsif Nkind (Parent (N)) = N_Op_Not
1297 and then Nkind (N) = N_Op_And
1299 Safe_In_Place_Array_Op (Name (Parent (Parent (N))), L, R)
1304 Func_Body := Make_Boolean_Array_Op (Etype (L), N);
1305 Func_Name := Defining_Unit_Name (Specification (Func_Body));
1306 Insert_Action (N, Func_Body);
1308 -- Now rewrite the expression with a call
1311 Make_Function_Call (Loc,
1312 Name => New_Reference_To (Func_Name, Loc),
1313 Parameter_Associations =>
1315 (L, Make_Type_Conversion
1316 (Loc, New_Reference_To (Etype (L), Loc), R))));
1318 Analyze_And_Resolve (N, Typ);
1322 end Expand_Boolean_Operator;
1324 -------------------------------
1325 -- Expand_Composite_Equality --
1326 -------------------------------
1328 -- This function is only called for comparing internal fields of composite
1329 -- types when these fields are themselves composites. This is a special
1330 -- case because it is not possible to respect normal Ada visibility rules.
1332 function Expand_Composite_Equality
1340 Loc : constant Source_Ptr := Sloc (Nod);
1341 Full_Type : Entity_Id;
1346 if Is_Private_Type (Typ) then
1347 Full_Type := Underlying_Type (Typ);
1352 -- Defense against malformed private types with no completion
1353 -- the error will be diagnosed later by check_completion
1355 if No (Full_Type) then
1356 return New_Reference_To (Standard_False, Loc);
1359 Full_Type := Base_Type (Full_Type);
1361 if Is_Array_Type (Full_Type) then
1363 -- If the operand is an elementary type other than a floating-point
1364 -- type, then we can simply use the built-in block bitwise equality,
1365 -- since the predefined equality operators always apply and bitwise
1366 -- equality is fine for all these cases.
1368 if Is_Elementary_Type (Component_Type (Full_Type))
1369 and then not Is_Floating_Point_Type (Component_Type (Full_Type))
1371 return Make_Op_Eq (Loc, Left_Opnd => Lhs, Right_Opnd => Rhs);
1373 -- For composite component types, and floating-point types, use
1374 -- the expansion. This deals with tagged component types (where
1375 -- we use the applicable equality routine) and floating-point,
1376 -- (where we need to worry about negative zeroes), and also the
1377 -- case of any composite type recursively containing such fields.
1380 return Expand_Array_Equality
1381 (Nod, Full_Type, Typ, Lhs, Rhs, Bodies);
1384 elsif Is_Tagged_Type (Full_Type) then
1386 -- Call the primitive operation "=" of this type
1388 if Is_Class_Wide_Type (Full_Type) then
1389 Full_Type := Root_Type (Full_Type);
1392 -- If this is derived from an untagged private type completed
1393 -- with a tagged type, it does not have a full view, so we
1394 -- use the primitive operations of the private type.
1395 -- This check should no longer be necessary when these
1396 -- types receive their full views ???
1398 if Is_Private_Type (Typ)
1399 and then not Is_Tagged_Type (Typ)
1400 and then not Is_Controlled (Typ)
1401 and then Is_Derived_Type (Typ)
1402 and then No (Full_View (Typ))
1404 Prim := First_Elmt (Collect_Primitive_Operations (Typ));
1406 Prim := First_Elmt (Primitive_Operations (Full_Type));
1410 Eq_Op := Node (Prim);
1411 exit when Chars (Eq_Op) = Name_Op_Eq
1412 and then Etype (First_Formal (Eq_Op)) =
1413 Etype (Next_Formal (First_Formal (Eq_Op)));
1415 pragma Assert (Present (Prim));
1418 Eq_Op := Node (Prim);
1421 Make_Function_Call (Loc,
1422 Name => New_Reference_To (Eq_Op, Loc),
1423 Parameter_Associations =>
1425 (Unchecked_Convert_To (Etype (First_Formal (Eq_Op)), Lhs),
1426 Unchecked_Convert_To (Etype (First_Formal (Eq_Op)), Rhs)));
1428 elsif Is_Record_Type (Full_Type) then
1429 Eq_Op := TSS (Full_Type, TSS_Composite_Equality);
1431 if Present (Eq_Op) then
1432 if Etype (First_Formal (Eq_Op)) /= Full_Type then
1434 -- Inherited equality from parent type. Convert the actuals
1435 -- to match signature of operation.
1438 T : constant Entity_Id := Etype (First_Formal (Eq_Op));
1442 Make_Function_Call (Loc,
1443 Name => New_Reference_To (Eq_Op, Loc),
1444 Parameter_Associations =>
1445 New_List (OK_Convert_To (T, Lhs),
1446 OK_Convert_To (T, Rhs)));
1451 Make_Function_Call (Loc,
1452 Name => New_Reference_To (Eq_Op, Loc),
1453 Parameter_Associations => New_List (Lhs, Rhs));
1457 return Expand_Record_Equality (Nod, Full_Type, Lhs, Rhs, Bodies);
1461 -- It can be a simple record or the full view of a scalar private
1463 return Make_Op_Eq (Loc, Left_Opnd => Lhs, Right_Opnd => Rhs);
1465 end Expand_Composite_Equality;
1467 ------------------------------
1468 -- Expand_Concatenate_Other --
1469 ------------------------------
1471 -- Let n be the number of array operands to be concatenated, Base_Typ
1472 -- their base type, Ind_Typ their index type, and Arr_Typ the original
1473 -- array type to which the concatenantion operator applies, then the
1474 -- following subprogram is constructed:
1476 -- [function Cnn (S1 : Base_Typ; ...; Sn : Base_Typ) return Base_Typ is
1479 -- if S1'Length /= 0 then
1480 -- L := XXX; --> XXX = S1'First if Arr_Typ is unconstrained
1481 -- XXX = Arr_Typ'First otherwise
1482 -- elsif S2'Length /= 0 then
1483 -- L := YYY; --> YYY = S2'First if Arr_Typ is unconstrained
1484 -- YYY = Arr_Typ'First otherwise
1486 -- elsif Sn-1'Length /= 0 then
1487 -- L := ZZZ; --> ZZZ = Sn-1'First if Arr_Typ is unconstrained
1488 -- ZZZ = Arr_Typ'First otherwise
1496 -- Ind_Typ'Val ((((S1'Length - 1) + S2'Length) + ... + Sn'Length)
1497 -- + Ind_Typ'Pos (L));
1498 -- R : Base_Typ (L .. H);
1500 -- if S1'Length /= 0 then
1504 -- L := Ind_Typ'Succ (L);
1505 -- exit when P = S1'Last;
1506 -- P := Ind_Typ'Succ (P);
1510 -- if S2'Length /= 0 then
1511 -- L := Ind_Typ'Succ (L);
1514 -- L := Ind_Typ'Succ (L);
1515 -- exit when P = S2'Last;
1516 -- P := Ind_Typ'Succ (P);
1522 -- if Sn'Length /= 0 then
1526 -- L := Ind_Typ'Succ (L);
1527 -- exit when P = Sn'Last;
1528 -- P := Ind_Typ'Succ (P);
1536 procedure Expand_Concatenate_Other (Cnode : Node_Id; Opnds : List_Id) is
1537 Loc : constant Source_Ptr := Sloc (Cnode);
1538 Nb_Opnds : constant Nat := List_Length (Opnds);
1540 Arr_Typ : constant Entity_Id := Etype (Entity (Cnode));
1541 Base_Typ : constant Entity_Id := Base_Type (Etype (Cnode));
1542 Ind_Typ : constant Entity_Id := Etype (First_Index (Base_Typ));
1545 Func_Spec : Node_Id;
1546 Param_Specs : List_Id;
1548 Func_Body : Node_Id;
1549 Func_Decls : List_Id;
1550 Func_Stmts : List_Id;
1555 Elsif_List : List_Id;
1557 Declare_Block : Node_Id;
1558 Declare_Decls : List_Id;
1559 Declare_Stmts : List_Id;
1571 function Copy_Into_R_S (I : Nat; Last : Boolean) return List_Id;
1572 -- Builds the sequence of statement:
1576 -- L := Ind_Typ'Succ (L);
1577 -- exit when P = Si'Last;
1578 -- P := Ind_Typ'Succ (P);
1581 -- where i is the input parameter I given.
1582 -- If the flag Last is true, the exit statement is emitted before
1583 -- incrementing the lower bound, to prevent the creation out of
1586 function Init_L (I : Nat) return Node_Id;
1587 -- Builds the statement:
1588 -- L := Arr_Typ'First; If Arr_Typ is constrained
1589 -- L := Si'First; otherwise (where I is the input param given)
1591 function H return Node_Id;
1592 -- Builds reference to identifier H.
1594 function Ind_Val (E : Node_Id) return Node_Id;
1595 -- Builds expression Ind_Typ'Val (E);
1597 function L return Node_Id;
1598 -- Builds reference to identifier L.
1600 function L_Pos return Node_Id;
1601 -- Builds expression Integer_Type'(Ind_Typ'Pos (L)).
1602 -- We qualify the expression to avoid universal_integer computations
1603 -- whenever possible, in the expression for the upper bound H.
1605 function L_Succ return Node_Id;
1606 -- Builds expression Ind_Typ'Succ (L).
1608 function One return Node_Id;
1609 -- Builds integer literal one.
1611 function P return Node_Id;
1612 -- Builds reference to identifier P.
1614 function P_Succ return Node_Id;
1615 -- Builds expression Ind_Typ'Succ (P).
1617 function R return Node_Id;
1618 -- Builds reference to identifier R.
1620 function S (I : Nat) return Node_Id;
1621 -- Builds reference to identifier Si, where I is the value given.
1623 function S_First (I : Nat) return Node_Id;
1624 -- Builds expression Si'First, where I is the value given.
1626 function S_Last (I : Nat) return Node_Id;
1627 -- Builds expression Si'Last, where I is the value given.
1629 function S_Length (I : Nat) return Node_Id;
1630 -- Builds expression Si'Length, where I is the value given.
1632 function S_Length_Test (I : Nat) return Node_Id;
1633 -- Builds expression Si'Length /= 0, where I is the value given.
1639 function Copy_Into_R_S (I : Nat; Last : Boolean) return List_Id is
1640 Stmts : constant List_Id := New_List;
1642 Loop_Stmt : Node_Id;
1644 Exit_Stmt : Node_Id;
1649 -- First construct the initializations
1651 P_Start := Make_Assignment_Statement (Loc,
1653 Expression => S_First (I));
1654 Append_To (Stmts, P_Start);
1656 -- Then build the loop
1658 R_Copy := Make_Assignment_Statement (Loc,
1659 Name => Make_Indexed_Component (Loc,
1661 Expressions => New_List (L)),
1662 Expression => Make_Indexed_Component (Loc,
1664 Expressions => New_List (P)));
1666 L_Inc := Make_Assignment_Statement (Loc,
1668 Expression => L_Succ);
1670 Exit_Stmt := Make_Exit_Statement (Loc,
1671 Condition => Make_Op_Eq (Loc, P, S_Last (I)));
1673 P_Inc := Make_Assignment_Statement (Loc,
1675 Expression => P_Succ);
1679 Make_Implicit_Loop_Statement (Cnode,
1680 Statements => New_List (R_Copy, Exit_Stmt, L_Inc, P_Inc));
1683 Make_Implicit_Loop_Statement (Cnode,
1684 Statements => New_List (R_Copy, L_Inc, Exit_Stmt, P_Inc));
1687 Append_To (Stmts, Loop_Stmt);
1696 function H return Node_Id is
1698 return Make_Identifier (Loc, Name_uH);
1705 function Ind_Val (E : Node_Id) return Node_Id is
1708 Make_Attribute_Reference (Loc,
1709 Prefix => New_Reference_To (Ind_Typ, Loc),
1710 Attribute_Name => Name_Val,
1711 Expressions => New_List (E));
1718 function Init_L (I : Nat) return Node_Id is
1722 if Is_Constrained (Arr_Typ) then
1723 E := Make_Attribute_Reference (Loc,
1724 Prefix => New_Reference_To (Arr_Typ, Loc),
1725 Attribute_Name => Name_First);
1731 return Make_Assignment_Statement (Loc, Name => L, Expression => E);
1738 function L return Node_Id is
1740 return Make_Identifier (Loc, Name_uL);
1747 function L_Pos return Node_Id is
1748 Target_Type : Entity_Id;
1751 -- If the index type is an enumeration type, the computation
1752 -- can be done in standard integer. Otherwise, choose a large
1753 -- enough integer type.
1755 if Is_Enumeration_Type (Ind_Typ)
1756 or else Root_Type (Ind_Typ) = Standard_Integer
1757 or else Root_Type (Ind_Typ) = Standard_Short_Integer
1758 or else Root_Type (Ind_Typ) = Standard_Short_Short_Integer
1760 Target_Type := Standard_Integer;
1762 Target_Type := Root_Type (Ind_Typ);
1766 Make_Qualified_Expression (Loc,
1767 Subtype_Mark => New_Reference_To (Target_Type, Loc),
1769 Make_Attribute_Reference (Loc,
1770 Prefix => New_Reference_To (Ind_Typ, Loc),
1771 Attribute_Name => Name_Pos,
1772 Expressions => New_List (L)));
1779 function L_Succ return Node_Id is
1782 Make_Attribute_Reference (Loc,
1783 Prefix => New_Reference_To (Ind_Typ, Loc),
1784 Attribute_Name => Name_Succ,
1785 Expressions => New_List (L));
1792 function One return Node_Id is
1794 return Make_Integer_Literal (Loc, 1);
1801 function P return Node_Id is
1803 return Make_Identifier (Loc, Name_uP);
1810 function P_Succ return Node_Id is
1813 Make_Attribute_Reference (Loc,
1814 Prefix => New_Reference_To (Ind_Typ, Loc),
1815 Attribute_Name => Name_Succ,
1816 Expressions => New_List (P));
1823 function R return Node_Id is
1825 return Make_Identifier (Loc, Name_uR);
1832 function S (I : Nat) return Node_Id is
1834 return Make_Identifier (Loc, New_External_Name ('S', I));
1841 function S_First (I : Nat) return Node_Id is
1843 return Make_Attribute_Reference (Loc,
1845 Attribute_Name => Name_First);
1852 function S_Last (I : Nat) return Node_Id is
1854 return Make_Attribute_Reference (Loc,
1856 Attribute_Name => Name_Last);
1863 function S_Length (I : Nat) return Node_Id is
1865 return Make_Attribute_Reference (Loc,
1867 Attribute_Name => Name_Length);
1874 function S_Length_Test (I : Nat) return Node_Id is
1878 Left_Opnd => S_Length (I),
1879 Right_Opnd => Make_Integer_Literal (Loc, 0));
1882 -- Start of processing for Expand_Concatenate_Other
1885 -- Construct the parameter specs and the overall function spec
1887 Param_Specs := New_List;
1888 for I in 1 .. Nb_Opnds loop
1891 Make_Parameter_Specification (Loc,
1892 Defining_Identifier =>
1893 Make_Defining_Identifier (Loc, New_External_Name ('S', I)),
1894 Parameter_Type => New_Reference_To (Base_Typ, Loc)));
1897 Func_Id := Make_Defining_Identifier (Loc, New_Internal_Name ('C'));
1899 Make_Function_Specification (Loc,
1900 Defining_Unit_Name => Func_Id,
1901 Parameter_Specifications => Param_Specs,
1902 Subtype_Mark => New_Reference_To (Base_Typ, Loc));
1904 -- Construct L's object declaration
1907 Make_Object_Declaration (Loc,
1908 Defining_Identifier => Make_Defining_Identifier (Loc, Name_uL),
1909 Object_Definition => New_Reference_To (Ind_Typ, Loc));
1911 Func_Decls := New_List (L_Decl);
1913 -- Construct the if-then-elsif statements
1915 Elsif_List := New_List;
1916 for I in 2 .. Nb_Opnds - 1 loop
1917 Append_To (Elsif_List, Make_Elsif_Part (Loc,
1918 Condition => S_Length_Test (I),
1919 Then_Statements => New_List (Init_L (I))));
1923 Make_Implicit_If_Statement (Cnode,
1924 Condition => S_Length_Test (1),
1925 Then_Statements => New_List (Init_L (1)),
1926 Elsif_Parts => Elsif_List,
1927 Else_Statements => New_List (Make_Return_Statement (Loc,
1928 Expression => S (Nb_Opnds))));
1930 -- Construct the declaration for H
1933 Make_Object_Declaration (Loc,
1934 Defining_Identifier => Make_Defining_Identifier (Loc, Name_uP),
1935 Object_Definition => New_Reference_To (Ind_Typ, Loc));
1937 H_Init := Make_Op_Subtract (Loc, S_Length (1), One);
1938 for I in 2 .. Nb_Opnds loop
1939 H_Init := Make_Op_Add (Loc, H_Init, S_Length (I));
1941 H_Init := Ind_Val (Make_Op_Add (Loc, H_Init, L_Pos));
1944 Make_Object_Declaration (Loc,
1945 Defining_Identifier => Make_Defining_Identifier (Loc, Name_uH),
1946 Object_Definition => New_Reference_To (Ind_Typ, Loc),
1947 Expression => H_Init);
1949 -- Construct the declaration for R
1951 R_Range := Make_Range (Loc, Low_Bound => L, High_Bound => H);
1953 Make_Index_Or_Discriminant_Constraint (Loc,
1954 Constraints => New_List (R_Range));
1957 Make_Object_Declaration (Loc,
1958 Defining_Identifier => Make_Defining_Identifier (Loc, Name_uR),
1959 Object_Definition =>
1960 Make_Subtype_Indication (Loc,
1961 Subtype_Mark => New_Reference_To (Base_Typ, Loc),
1962 Constraint => R_Constr));
1964 -- Construct the declarations for the declare block
1966 Declare_Decls := New_List (P_Decl, H_Decl, R_Decl);
1968 -- Construct list of statements for the declare block
1970 Declare_Stmts := New_List;
1971 for I in 1 .. Nb_Opnds loop
1972 Append_To (Declare_Stmts,
1973 Make_Implicit_If_Statement (Cnode,
1974 Condition => S_Length_Test (I),
1975 Then_Statements => Copy_Into_R_S (I, I = Nb_Opnds)));
1978 Append_To (Declare_Stmts, Make_Return_Statement (Loc, Expression => R));
1980 -- Construct the declare block
1982 Declare_Block := Make_Block_Statement (Loc,
1983 Declarations => Declare_Decls,
1984 Handled_Statement_Sequence =>
1985 Make_Handled_Sequence_Of_Statements (Loc, Declare_Stmts));
1987 -- Construct the list of function statements
1989 Func_Stmts := New_List (If_Stmt, Declare_Block);
1991 -- Construct the function body
1994 Make_Subprogram_Body (Loc,
1995 Specification => Func_Spec,
1996 Declarations => Func_Decls,
1997 Handled_Statement_Sequence =>
1998 Make_Handled_Sequence_Of_Statements (Loc, Func_Stmts));
2000 -- Insert the newly generated function in the code. This is analyzed
2001 -- with all checks off, since we have completed all the checks.
2003 -- Note that this does *not* fix the array concatenation bug when the
2004 -- low bound is Integer'first sibce that bug comes from the pointer
2005 -- dereferencing an unconstrained array. An there we need a constraint
2006 -- check to make sure the length of the concatenated array is ok. ???
2008 Insert_Action (Cnode, Func_Body, Suppress => All_Checks);
2010 -- Construct list of arguments for the function call
2013 Operand := First (Opnds);
2014 for I in 1 .. Nb_Opnds loop
2015 Append_To (Params, Relocate_Node (Operand));
2019 -- Insert the function call
2023 Make_Function_Call (Loc, New_Reference_To (Func_Id, Loc), Params));
2025 Analyze_And_Resolve (Cnode, Base_Typ);
2026 Set_Is_Inlined (Func_Id);
2027 end Expand_Concatenate_Other;
2029 -------------------------------
2030 -- Expand_Concatenate_String --
2031 -------------------------------
2033 procedure Expand_Concatenate_String (Cnode : Node_Id; Opnds : List_Id) is
2034 Loc : constant Source_Ptr := Sloc (Cnode);
2035 Opnd1 : constant Node_Id := First (Opnds);
2036 Opnd2 : constant Node_Id := Next (Opnd1);
2037 Typ1 : constant Entity_Id := Base_Type (Etype (Opnd1));
2038 Typ2 : constant Entity_Id := Base_Type (Etype (Opnd2));
2041 -- RE_Id value for function to be called
2044 -- In all cases, we build a call to a routine giving the list of
2045 -- arguments as the parameter list to the routine.
2047 case List_Length (Opnds) is
2049 if Typ1 = Standard_Character then
2050 if Typ2 = Standard_Character then
2051 R := RE_Str_Concat_CC;
2054 pragma Assert (Typ2 = Standard_String);
2055 R := RE_Str_Concat_CS;
2058 elsif Typ1 = Standard_String then
2059 if Typ2 = Standard_Character then
2060 R := RE_Str_Concat_SC;
2063 pragma Assert (Typ2 = Standard_String);
2067 -- If we have anything other than Standard_Character or
2068 -- Standard_String, then we must have had a serious error
2069 -- earlier, so we just abandon the attempt at expansion.
2072 pragma Assert (Serious_Errors_Detected > 0);
2077 R := RE_Str_Concat_3;
2080 R := RE_Str_Concat_4;
2083 R := RE_Str_Concat_5;
2087 raise Program_Error;
2090 -- Now generate the appropriate call
2093 Make_Function_Call (Sloc (Cnode),
2094 Name => New_Occurrence_Of (RTE (R), Loc),
2095 Parameter_Associations => Opnds));
2097 Analyze_And_Resolve (Cnode, Standard_String);
2100 when RE_Not_Available =>
2102 end Expand_Concatenate_String;
2104 ------------------------
2105 -- Expand_N_Allocator --
2106 ------------------------
2108 procedure Expand_N_Allocator (N : Node_Id) is
2109 PtrT : constant Entity_Id := Etype (N);
2111 Loc : constant Source_Ptr := Sloc (N);
2116 -- RM E.2.3(22). We enforce that the expected type of an allocator
2117 -- shall not be a remote access-to-class-wide-limited-private type
2119 -- Why is this being done at expansion time, seems clearly wrong ???
2121 Validate_Remote_Access_To_Class_Wide_Type (N);
2123 -- Set the Storage Pool
2125 Set_Storage_Pool (N, Associated_Storage_Pool (Root_Type (PtrT)));
2127 if Present (Storage_Pool (N)) then
2128 if Is_RTE (Storage_Pool (N), RE_SS_Pool) then
2130 Set_Procedure_To_Call (N, RTE (RE_SS_Allocate));
2133 elsif Is_Class_Wide_Type (Etype (Storage_Pool (N))) then
2134 Set_Procedure_To_Call (N, RTE (RE_Allocate_Any));
2137 Set_Procedure_To_Call (N,
2138 Find_Prim_Op (Etype (Storage_Pool (N)), Name_Allocate));
2142 -- Under certain circumstances we can replace an allocator by an
2143 -- access to statically allocated storage. The conditions, as noted
2144 -- in AARM 3.10 (10c) are as follows:
2146 -- Size and initial value is known at compile time
2147 -- Access type is access-to-constant
2149 -- The allocator is not part of a constraint on a record component,
2150 -- because in that case the inserted actions are delayed until the
2151 -- record declaration is fully analyzed, which is too late for the
2152 -- analysis of the rewritten allocator.
2154 if Is_Access_Constant (PtrT)
2155 and then Nkind (Expression (N)) = N_Qualified_Expression
2156 and then Compile_Time_Known_Value (Expression (Expression (N)))
2157 and then Size_Known_At_Compile_Time (Etype (Expression
2159 and then not Is_Record_Type (Current_Scope)
2161 -- Here we can do the optimization. For the allocator
2165 -- We insert an object declaration
2167 -- Tnn : aliased x := y;
2169 -- and replace the allocator by Tnn'Unrestricted_Access.
2170 -- Tnn is marked as requiring static allocation.
2173 Make_Defining_Identifier (Loc, New_Internal_Name ('T'));
2175 Desig := Subtype_Mark (Expression (N));
2177 -- If context is constrained, use constrained subtype directly,
2178 -- so that the constant is not labelled as having a nomimally
2179 -- unconstrained subtype.
2181 if Entity (Desig) = Base_Type (Designated_Type (PtrT)) then
2182 Desig := New_Occurrence_Of (Designated_Type (PtrT), Loc);
2186 Make_Object_Declaration (Loc,
2187 Defining_Identifier => Temp,
2188 Aliased_Present => True,
2189 Constant_Present => Is_Access_Constant (PtrT),
2190 Object_Definition => Desig,
2191 Expression => Expression (Expression (N))));
2194 Make_Attribute_Reference (Loc,
2195 Prefix => New_Occurrence_Of (Temp, Loc),
2196 Attribute_Name => Name_Unrestricted_Access));
2198 Analyze_And_Resolve (N, PtrT);
2200 -- We set the variable as statically allocated, since we don't
2201 -- want it going on the stack of the current procedure!
2203 Set_Is_Statically_Allocated (Temp);
2207 if Nkind (Expression (N)) = N_Qualified_Expression then
2208 Expand_Allocator_Expression (N);
2210 -- If the allocator is for a type which requires initialization, and
2211 -- there is no initial value (i.e. operand is a subtype indication
2212 -- rather than a qualifed expression), then we must generate a call
2213 -- to the initialization routine. This is done using an expression
2216 -- [Pnnn : constant ptr_T := new (T); Init (Pnnn.all,...); Pnnn]
2218 -- Here ptr_T is the pointer type for the allocator, and T is the
2219 -- subtype of the allocator. A special case arises if the designated
2220 -- type of the access type is a task or contains tasks. In this case
2221 -- the call to Init (Temp.all ...) is replaced by code that ensures
2222 -- that tasks get activated (see Exp_Ch9.Build_Task_Allocate_Block
2223 -- for details). In addition, if the type T is a task T, then the
2224 -- first argument to Init must be converted to the task record type.
2228 T : constant Entity_Id := Entity (Expression (N));
2236 Temp_Decl : Node_Id;
2237 Temp_Type : Entity_Id;
2241 if No_Initialization (N) then
2244 -- Case of no initialization procedure present
2246 elsif not Has_Non_Null_Base_Init_Proc (T) then
2248 -- Case of simple initialization required
2250 if Needs_Simple_Initialization (T) then
2251 Rewrite (Expression (N),
2252 Make_Qualified_Expression (Loc,
2253 Subtype_Mark => New_Occurrence_Of (T, Loc),
2254 Expression => Get_Simple_Init_Val (T, Loc)));
2256 Analyze_And_Resolve (Expression (Expression (N)), T);
2257 Analyze_And_Resolve (Expression (N), T);
2258 Set_Paren_Count (Expression (Expression (N)), 1);
2259 Expand_N_Allocator (N);
2261 -- No initialization required
2267 -- Case of initialization procedure present, must be called
2270 Init := Base_Init_Proc (T);
2273 Make_Defining_Identifier (Loc, New_Internal_Name ('P'));
2275 -- Construct argument list for the initialization routine call
2276 -- The CPP constructor needs the address directly
2278 if Is_CPP_Class (T) then
2279 Arg1 := New_Reference_To (Temp, Loc);
2284 Make_Explicit_Dereference (Loc,
2285 Prefix => New_Reference_To (Temp, Loc));
2286 Set_Assignment_OK (Arg1);
2289 -- The initialization procedure expects a specific type.
2290 -- if the context is access to class wide, indicate that
2291 -- the object being allocated has the right specific type.
2293 if Is_Class_Wide_Type (Designated_Type (PtrT)) then
2294 Arg1 := Unchecked_Convert_To (T, Arg1);
2298 -- If designated type is a concurrent type or if it is a
2299 -- private type whose definition is a concurrent type,
2300 -- the first argument in the Init routine has to be
2301 -- unchecked conversion to the corresponding record type.
2302 -- If the designated type is a derived type, we also
2303 -- convert the argument to its root type.
2305 if Is_Concurrent_Type (T) then
2307 Unchecked_Convert_To (Corresponding_Record_Type (T), Arg1);
2309 elsif Is_Private_Type (T)
2310 and then Present (Full_View (T))
2311 and then Is_Concurrent_Type (Full_View (T))
2314 Unchecked_Convert_To
2315 (Corresponding_Record_Type (Full_View (T)), Arg1);
2317 elsif Etype (First_Formal (Init)) /= Base_Type (T) then
2320 Ftyp : constant Entity_Id := Etype (First_Formal (Init));
2323 Arg1 := OK_Convert_To (Etype (Ftyp), Arg1);
2324 Set_Etype (Arg1, Ftyp);
2328 Args := New_List (Arg1);
2330 -- For the task case, pass the Master_Id of the access type
2331 -- as the value of the _Master parameter, and _Chain as the
2332 -- value of the _Chain parameter (_Chain will be defined as
2333 -- part of the generated code for the allocator).
2335 if Has_Task (T) then
2337 if No (Master_Id (Base_Type (PtrT))) then
2339 -- The designated type was an incomplete type, and
2340 -- the access type did not get expanded. Salvage
2343 Expand_N_Full_Type_Declaration
2344 (Parent (Base_Type (PtrT)));
2347 -- If the context of the allocator is a declaration or
2348 -- an assignment, we can generate a meaningful image for
2349 -- it, even though subsequent assignments might remove
2350 -- the connection between task and entity. We build this
2351 -- image when the left-hand side is a simple variable,
2352 -- a simple indexed assignment or a simple selected
2355 if Nkind (Parent (N)) = N_Assignment_Statement then
2357 Nam : constant Node_Id := Name (Parent (N));
2360 if Is_Entity_Name (Nam) then
2362 Build_Task_Image_Decls (
2365 (Entity (Nam), Sloc (Nam)), T);
2367 elsif (Nkind (Nam) = N_Indexed_Component
2368 or else Nkind (Nam) = N_Selected_Component)
2369 and then Is_Entity_Name (Prefix (Nam))
2372 Build_Task_Image_Decls
2373 (Loc, Nam, Etype (Prefix (Nam)));
2375 Decls := Build_Task_Image_Decls (Loc, T, T);
2379 elsif Nkind (Parent (N)) = N_Object_Declaration then
2381 Build_Task_Image_Decls (
2382 Loc, Defining_Identifier (Parent (N)), T);
2385 Decls := Build_Task_Image_Decls (Loc, T, T);
2390 (Master_Id (Base_Type (Root_Type (PtrT))), Loc));
2391 Append_To (Args, Make_Identifier (Loc, Name_uChain));
2393 Decl := Last (Decls);
2395 New_Occurrence_Of (Defining_Identifier (Decl), Loc));
2397 -- Has_Task is false, Decls not used
2403 -- Add discriminants if discriminated type
2405 if Has_Discriminants (T) then
2406 Discr := First_Elmt (Discriminant_Constraint (T));
2408 while Present (Discr) loop
2409 Append (New_Copy_Tree (Elists.Node (Discr)), Args);
2413 elsif Is_Private_Type (T)
2414 and then Present (Full_View (T))
2415 and then Has_Discriminants (Full_View (T))
2418 First_Elmt (Discriminant_Constraint (Full_View (T)));
2420 while Present (Discr) loop
2421 Append (New_Copy_Tree (Elists.Node (Discr)), Args);
2426 -- We set the allocator as analyzed so that when we analyze the
2427 -- expression actions node, we do not get an unwanted recursive
2428 -- expansion of the allocator expression.
2430 Set_Analyzed (N, True);
2431 Node := Relocate_Node (N);
2433 -- Here is the transformation:
2435 -- output: Temp : constant ptr_T := new T;
2436 -- Init (Temp.all, ...);
2437 -- <CTRL> Attach_To_Final_List (Finalizable (Temp.all));
2438 -- <CTRL> Initialize (Finalizable (Temp.all));
2440 -- Here ptr_T is the pointer type for the allocator, and T
2441 -- is the subtype of the allocator.
2444 Make_Object_Declaration (Loc,
2445 Defining_Identifier => Temp,
2446 Constant_Present => True,
2447 Object_Definition => New_Reference_To (Temp_Type, Loc),
2448 Expression => Node);
2450 Set_Assignment_OK (Temp_Decl);
2452 if Is_CPP_Class (T) then
2453 Set_Aliased_Present (Temp_Decl);
2456 Insert_Action (N, Temp_Decl, Suppress => All_Checks);
2458 -- If the designated type is task type or contains tasks,
2459 -- Create block to activate created tasks, and insert
2460 -- declaration for Task_Image variable ahead of call.
2462 if Has_Task (T) then
2464 L : constant List_Id := New_List;
2468 Build_Task_Allocate_Block (L, Node, Args);
2471 Insert_List_Before (First (Declarations (Blk)), Decls);
2472 Insert_Actions (N, L);
2477 Make_Procedure_Call_Statement (Loc,
2478 Name => New_Reference_To (Init, Loc),
2479 Parameter_Associations => Args));
2482 if Controlled_Type (T) then
2483 Flist := Get_Allocator_Final_List (N, Base_Type (T), PtrT);
2487 Ref => New_Copy_Tree (Arg1),
2490 With_Attach => Make_Integer_Literal (Loc, 2)));
2493 if Is_CPP_Class (T) then
2495 Make_Attribute_Reference (Loc,
2496 Prefix => New_Reference_To (Temp, Loc),
2497 Attribute_Name => Name_Unchecked_Access));
2499 Rewrite (N, New_Reference_To (Temp, Loc));
2502 Analyze_And_Resolve (N, PtrT);
2508 when RE_Not_Available =>
2510 end Expand_N_Allocator;
2512 -----------------------
2513 -- Expand_N_And_Then --
2514 -----------------------
2516 -- Expand into conditional expression if Actions present, and also
2517 -- deal with optimizing case of arguments being True or False.
2519 procedure Expand_N_And_Then (N : Node_Id) is
2520 Loc : constant Source_Ptr := Sloc (N);
2521 Typ : constant Entity_Id := Etype (N);
2522 Left : constant Node_Id := Left_Opnd (N);
2523 Right : constant Node_Id := Right_Opnd (N);
2527 -- Deal with non-standard booleans
2529 if Is_Boolean_Type (Typ) then
2530 Adjust_Condition (Left);
2531 Adjust_Condition (Right);
2532 Set_Etype (N, Standard_Boolean);
2535 -- Check for cases of left argument is True or False
2537 if Nkind (Left) = N_Identifier then
2539 -- If left argument is True, change (True and then Right) to Right.
2540 -- Any actions associated with Right will be executed unconditionally
2541 -- and can thus be inserted into the tree unconditionally.
2543 if Entity (Left) = Standard_True then
2544 if Present (Actions (N)) then
2545 Insert_Actions (N, Actions (N));
2549 Adjust_Result_Type (N, Typ);
2552 -- If left argument is False, change (False and then Right) to
2553 -- False. In this case we can forget the actions associated with
2554 -- Right, since they will never be executed.
2556 elsif Entity (Left) = Standard_False then
2557 Kill_Dead_Code (Right);
2558 Kill_Dead_Code (Actions (N));
2559 Rewrite (N, New_Occurrence_Of (Standard_False, Loc));
2560 Adjust_Result_Type (N, Typ);
2565 -- If Actions are present, we expand
2567 -- left and then right
2571 -- if left then right else false end
2573 -- with the actions becoming the Then_Actions of the conditional
2574 -- expression. This conditional expression is then further expanded
2575 -- (and will eventually disappear)
2577 if Present (Actions (N)) then
2578 Actlist := Actions (N);
2580 Make_Conditional_Expression (Loc,
2581 Expressions => New_List (
2584 New_Occurrence_Of (Standard_False, Loc))));
2586 Set_Then_Actions (N, Actlist);
2587 Analyze_And_Resolve (N, Standard_Boolean);
2588 Adjust_Result_Type (N, Typ);
2592 -- No actions present, check for cases of right argument True/False
2594 if Nkind (Right) = N_Identifier then
2596 -- Change (Left and then True) to Left. Note that we know there
2597 -- are no actions associated with the True operand, since we
2598 -- just checked for this case above.
2600 if Entity (Right) = Standard_True then
2603 -- Change (Left and then False) to False, making sure to preserve
2604 -- any side effects associated with the Left operand.
2606 elsif Entity (Right) = Standard_False then
2607 Remove_Side_Effects (Left);
2609 (N, New_Occurrence_Of (Standard_False, Loc));
2613 Adjust_Result_Type (N, Typ);
2614 end Expand_N_And_Then;
2616 -------------------------------------
2617 -- Expand_N_Conditional_Expression --
2618 -------------------------------------
2620 -- Expand into expression actions if then/else actions present
2622 procedure Expand_N_Conditional_Expression (N : Node_Id) is
2623 Loc : constant Source_Ptr := Sloc (N);
2624 Cond : constant Node_Id := First (Expressions (N));
2625 Thenx : constant Node_Id := Next (Cond);
2626 Elsex : constant Node_Id := Next (Thenx);
2627 Typ : constant Entity_Id := Etype (N);
2632 -- If either then or else actions are present, then given:
2634 -- if cond then then-expr else else-expr end
2636 -- we insert the following sequence of actions (using Insert_Actions):
2641 -- Cnn := then-expr;
2647 -- and replace the conditional expression by a reference to Cnn.
2649 if Present (Then_Actions (N)) or else Present (Else_Actions (N)) then
2650 Cnn := Make_Defining_Identifier (Loc, New_Internal_Name ('C'));
2653 Make_Implicit_If_Statement (N,
2654 Condition => Relocate_Node (Cond),
2656 Then_Statements => New_List (
2657 Make_Assignment_Statement (Sloc (Thenx),
2658 Name => New_Occurrence_Of (Cnn, Sloc (Thenx)),
2659 Expression => Relocate_Node (Thenx))),
2661 Else_Statements => New_List (
2662 Make_Assignment_Statement (Sloc (Elsex),
2663 Name => New_Occurrence_Of (Cnn, Sloc (Elsex)),
2664 Expression => Relocate_Node (Elsex))));
2666 Set_Assignment_OK (Name (First (Then_Statements (New_If))));
2667 Set_Assignment_OK (Name (First (Else_Statements (New_If))));
2669 if Present (Then_Actions (N)) then
2671 (First (Then_Statements (New_If)), Then_Actions (N));
2674 if Present (Else_Actions (N)) then
2676 (First (Else_Statements (New_If)), Else_Actions (N));
2679 Rewrite (N, New_Occurrence_Of (Cnn, Loc));
2682 Make_Object_Declaration (Loc,
2683 Defining_Identifier => Cnn,
2684 Object_Definition => New_Occurrence_Of (Typ, Loc)));
2686 Insert_Action (N, New_If);
2687 Analyze_And_Resolve (N, Typ);
2689 end Expand_N_Conditional_Expression;
2691 -----------------------------------
2692 -- Expand_N_Explicit_Dereference --
2693 -----------------------------------
2695 procedure Expand_N_Explicit_Dereference (N : Node_Id) is
2697 -- The only processing required is an insertion of an explicit
2698 -- dereference call for the checked storage pool case.
2700 Insert_Dereference_Action (Prefix (N));
2701 end Expand_N_Explicit_Dereference;
2707 procedure Expand_N_In (N : Node_Id) is
2708 Loc : constant Source_Ptr := Sloc (N);
2709 Rtyp : constant Entity_Id := Etype (N);
2710 Lop : constant Node_Id := Left_Opnd (N);
2711 Rop : constant Node_Id := Right_Opnd (N);
2714 -- If we have an explicit range, do a bit of optimization based
2715 -- on range analysis (we may be able to kill one or both checks).
2717 if Nkind (Rop) = N_Range then
2719 Lcheck : constant Compare_Result :=
2720 Compile_Time_Compare (Lop, Low_Bound (Rop));
2721 Ucheck : constant Compare_Result :=
2722 Compile_Time_Compare (Lop, High_Bound (Rop));
2725 -- If either check is known to fail, replace result
2726 -- by False, since the other check does not matter.
2728 if Lcheck = LT or else Ucheck = GT then
2730 New_Reference_To (Standard_False, Loc));
2731 Analyze_And_Resolve (N, Rtyp);
2734 -- If both checks are known to succeed, replace result
2735 -- by True, since we know we are in range.
2737 elsif Lcheck in Compare_GE and then Ucheck in Compare_LE then
2739 New_Reference_To (Standard_True, Loc));
2740 Analyze_And_Resolve (N, Rtyp);
2743 -- If lower bound check succeeds and upper bound check is
2744 -- not known to succeed or fail, then replace the range check
2745 -- with a comparison against the upper bound.
2747 elsif Lcheck in Compare_GE then
2751 Right_Opnd => High_Bound (Rop)));
2752 Analyze_And_Resolve (N, Rtyp);
2755 -- If upper bound check succeeds and lower bound check is
2756 -- not known to succeed or fail, then replace the range check
2757 -- with a comparison against the lower bound.
2759 elsif Ucheck in Compare_LE then
2763 Right_Opnd => Low_Bound (Rop)));
2764 Analyze_And_Resolve (N, Rtyp);
2769 -- For all other cases of an explicit range, nothing to be done
2773 -- Here right operand is a subtype mark
2777 Typ : Entity_Id := Etype (Rop);
2778 Is_Acc : constant Boolean := Is_Access_Type (Typ);
2779 Obj : Node_Id := Lop;
2780 Cond : Node_Id := Empty;
2783 Remove_Side_Effects (Obj);
2785 -- For tagged type, do tagged membership operation
2787 if Is_Tagged_Type (Typ) then
2789 -- No expansion will be performed when Java_VM, as the
2790 -- JVM back end will handle the membership tests directly
2791 -- (tags are not explicitly represented in Java objects,
2792 -- so the normal tagged membership expansion is not what
2796 Rewrite (N, Tagged_Membership (N));
2797 Analyze_And_Resolve (N, Rtyp);
2802 -- If type is scalar type, rewrite as x in t'first .. t'last
2803 -- This reason we do this is that the bounds may have the wrong
2804 -- type if they come from the original type definition.
2806 elsif Is_Scalar_Type (Typ) then
2810 Make_Attribute_Reference (Loc,
2811 Attribute_Name => Name_First,
2812 Prefix => New_Reference_To (Typ, Loc)),
2815 Make_Attribute_Reference (Loc,
2816 Attribute_Name => Name_Last,
2817 Prefix => New_Reference_To (Typ, Loc))));
2818 Analyze_And_Resolve (N, Rtyp);
2822 -- Here we have a non-scalar type
2825 Typ := Designated_Type (Typ);
2828 if not Is_Constrained (Typ) then
2830 New_Reference_To (Standard_True, Loc));
2831 Analyze_And_Resolve (N, Rtyp);
2833 -- For the constrained array case, we have to check the
2834 -- subscripts for an exact match if the lengths are
2835 -- non-zero (the lengths must match in any case).
2837 elsif Is_Array_Type (Typ) then
2839 Check_Subscripts : declare
2840 function Construct_Attribute_Reference
2845 -- Build attribute reference E'Nam(Dim)
2847 -----------------------------------
2848 -- Construct_Attribute_Reference --
2849 -----------------------------------
2851 function Construct_Attribute_Reference
2859 Make_Attribute_Reference (Loc,
2861 Attribute_Name => Nam,
2862 Expressions => New_List (
2863 Make_Integer_Literal (Loc, Dim)));
2864 end Construct_Attribute_Reference;
2866 -- Start processing for Check_Subscripts
2869 for J in 1 .. Number_Dimensions (Typ) loop
2870 Evolve_And_Then (Cond,
2873 Construct_Attribute_Reference
2874 (Duplicate_Subexpr_No_Checks (Obj),
2877 Construct_Attribute_Reference
2878 (New_Occurrence_Of (Typ, Loc), Name_First, J)));
2880 Evolve_And_Then (Cond,
2883 Construct_Attribute_Reference
2884 (Duplicate_Subexpr_No_Checks (Obj),
2887 Construct_Attribute_Reference
2888 (New_Occurrence_Of (Typ, Loc), Name_Last, J)));
2897 Right_Opnd => Make_Null (Loc)),
2898 Right_Opnd => Cond);
2902 Analyze_And_Resolve (N, Rtyp);
2903 end Check_Subscripts;
2905 -- These are the cases where constraint checks may be
2906 -- required, e.g. records with possible discriminants
2909 -- Expand the test into a series of discriminant comparisons.
2910 -- The expression that is built is the negation of the one
2911 -- that is used for checking discriminant constraints.
2913 Obj := Relocate_Node (Left_Opnd (N));
2915 if Has_Discriminants (Typ) then
2916 Cond := Make_Op_Not (Loc,
2917 Right_Opnd => Build_Discriminant_Checks (Obj, Typ));
2920 Cond := Make_Or_Else (Loc,
2924 Right_Opnd => Make_Null (Loc)),
2925 Right_Opnd => Cond);
2929 Cond := New_Occurrence_Of (Standard_True, Loc);
2933 Analyze_And_Resolve (N, Rtyp);
2939 --------------------------------
2940 -- Expand_N_Indexed_Component --
2941 --------------------------------
2943 procedure Expand_N_Indexed_Component (N : Node_Id) is
2944 Loc : constant Source_Ptr := Sloc (N);
2945 Typ : constant Entity_Id := Etype (N);
2946 P : constant Node_Id := Prefix (N);
2947 T : constant Entity_Id := Etype (P);
2950 -- A special optimization, if we have an indexed component that
2951 -- is selecting from a slice, then we can eliminate the slice,
2952 -- since, for example, x (i .. j)(k) is identical to x(k). The
2953 -- only difference is the range check required by the slice. The
2954 -- range check for the slice itself has already been generated.
2955 -- The range check for the subscripting operation is ensured
2956 -- by converting the subject to the subtype of the slice.
2958 -- This optimization not only generates better code, avoiding
2959 -- slice messing especially in the packed case, but more importantly
2960 -- bypasses some problems in handling this peculiar case, for
2961 -- example, the issue of dealing specially with object renamings.
2963 if Nkind (P) = N_Slice then
2965 Make_Indexed_Component (Loc,
2966 Prefix => Prefix (P),
2967 Expressions => New_List (
2969 (Etype (First_Index (Etype (P))),
2970 First (Expressions (N))))));
2971 Analyze_And_Resolve (N, Typ);
2975 -- If the prefix is an access type, then we unconditionally rewrite
2976 -- if as an explicit deference. This simplifies processing for several
2977 -- cases, including packed array cases and certain cases in which
2978 -- checks must be generated. We used to try to do this only when it
2979 -- was necessary, but it cleans up the code to do it all the time.
2981 if Is_Access_Type (T) then
2983 -- Check whether the prefix comes from a debug pool, and generate
2984 -- the check before rewriting.
2986 Insert_Dereference_Action (P);
2989 Make_Explicit_Dereference (Sloc (N),
2990 Prefix => Relocate_Node (P)));
2991 Analyze_And_Resolve (P, Designated_Type (T));
2994 -- Generate index and validity checks
2996 Generate_Index_Checks (N);
2998 if Validity_Checks_On and then Validity_Check_Subscripts then
2999 Apply_Subscript_Validity_Checks (N);
3002 -- All done for the non-packed case
3004 if not Is_Packed (Etype (Prefix (N))) then
3008 -- For packed arrays that are not bit-packed (i.e. the case of an array
3009 -- with one or more index types with a non-coniguous enumeration type),
3010 -- we can always use the normal packed element get circuit.
3012 if not Is_Bit_Packed_Array (Etype (Prefix (N))) then
3013 Expand_Packed_Element_Reference (N);
3017 -- For a reference to a component of a bit packed array, we have to
3018 -- convert it to a reference to the corresponding Packed_Array_Type.
3019 -- We only want to do this for simple references, and not for:
3021 -- Left side of assignment, or prefix of left side of assignment,
3022 -- or prefix of the prefix, to handle packed arrays of packed arrays,
3023 -- This case is handled in Exp_Ch5.Expand_N_Assignment_Statement
3025 -- Renaming objects in renaming associations
3026 -- This case is handled when a use of the renamed variable occurs
3028 -- Actual parameters for a procedure call
3029 -- This case is handled in Exp_Ch6.Expand_Actuals
3031 -- The second expression in a 'Read attribute reference
3033 -- The prefix of an address or size attribute reference
3035 -- The following circuit detects these exceptions
3038 Child : Node_Id := N;
3039 Parnt : Node_Id := Parent (N);
3043 if Nkind (Parnt) = N_Unchecked_Expression then
3046 elsif Nkind (Parnt) = N_Object_Renaming_Declaration
3047 or else Nkind (Parnt) = N_Procedure_Call_Statement
3048 or else (Nkind (Parnt) = N_Parameter_Association
3050 Nkind (Parent (Parnt)) = N_Procedure_Call_Statement)
3054 elsif Nkind (Parnt) = N_Attribute_Reference
3055 and then (Attribute_Name (Parnt) = Name_Address
3057 Attribute_Name (Parnt) = Name_Size)
3058 and then Prefix (Parnt) = Child
3062 elsif Nkind (Parnt) = N_Assignment_Statement
3063 and then Name (Parnt) = Child
3067 -- If the expression is an index of an indexed component,
3068 -- it must be expanded regardless of context.
3070 elsif Nkind (Parnt) = N_Indexed_Component
3071 and then Child /= Prefix (Parnt)
3073 Expand_Packed_Element_Reference (N);
3076 elsif Nkind (Parent (Parnt)) = N_Assignment_Statement
3077 and then Name (Parent (Parnt)) = Parnt
3081 elsif Nkind (Parnt) = N_Attribute_Reference
3082 and then Attribute_Name (Parnt) = Name_Read
3083 and then Next (First (Expressions (Parnt))) = Child
3087 elsif (Nkind (Parnt) = N_Indexed_Component
3088 or else Nkind (Parnt) = N_Selected_Component)
3089 and then Prefix (Parnt) = Child
3094 Expand_Packed_Element_Reference (N);
3098 -- Keep looking up tree for unchecked expression, or if we are
3099 -- the prefix of a possible assignment left side.
3102 Parnt := Parent (Child);
3106 end Expand_N_Indexed_Component;
3108 ---------------------
3109 -- Expand_N_Not_In --
3110 ---------------------
3112 -- Replace a not in b by not (a in b) so that the expansions for (a in b)
3113 -- can be done. This avoids needing to duplicate this expansion code.
3115 procedure Expand_N_Not_In (N : Node_Id) is
3116 Loc : constant Source_Ptr := Sloc (N);
3117 Typ : constant Entity_Id := Etype (N);
3124 Left_Opnd => Left_Opnd (N),
3125 Right_Opnd => Right_Opnd (N))));
3126 Analyze_And_Resolve (N, Typ);
3127 end Expand_N_Not_In;
3133 -- The only replacement required is for the case of a null of type
3134 -- that is an access to protected subprogram. We represent such
3135 -- access values as a record, and so we must replace the occurrence
3136 -- of null by the equivalent record (with a null address and a null
3137 -- pointer in it), so that the backend creates the proper value.
3139 procedure Expand_N_Null (N : Node_Id) is
3140 Loc : constant Source_Ptr := Sloc (N);
3141 Typ : constant Entity_Id := Etype (N);
3145 if Ekind (Typ) = E_Access_Protected_Subprogram_Type then
3147 Make_Aggregate (Loc,
3148 Expressions => New_List (
3149 New_Occurrence_Of (RTE (RE_Null_Address), Loc),
3153 Analyze_And_Resolve (N, Equivalent_Type (Typ));
3155 -- For subsequent semantic analysis, the node must retain its
3156 -- type. Gigi in any case replaces this type by the corresponding
3157 -- record type before processing the node.
3163 when RE_Not_Available =>
3167 ---------------------
3168 -- Expand_N_Op_Abs --
3169 ---------------------
3171 procedure Expand_N_Op_Abs (N : Node_Id) is
3172 Loc : constant Source_Ptr := Sloc (N);
3173 Expr : constant Node_Id := Right_Opnd (N);
3176 Unary_Op_Validity_Checks (N);
3178 -- Deal with software overflow checking
3180 if not Backend_Overflow_Checks_On_Target
3181 and then Is_Signed_Integer_Type (Etype (N))
3182 and then Do_Overflow_Check (N)
3184 -- The only case to worry about is when the argument is
3185 -- equal to the largest negative number, so what we do is
3186 -- to insert the check:
3188 -- [constraint_error when Expr = typ'Base'First]
3190 -- with the usual Duplicate_Subexpr use coding for expr
3193 Make_Raise_Constraint_Error (Loc,
3196 Left_Opnd => Duplicate_Subexpr (Expr),
3198 Make_Attribute_Reference (Loc,
3200 New_Occurrence_Of (Base_Type (Etype (Expr)), Loc),
3201 Attribute_Name => Name_First)),
3202 Reason => CE_Overflow_Check_Failed));
3205 -- Vax floating-point types case
3207 if Vax_Float (Etype (N)) then
3208 Expand_Vax_Arith (N);
3210 end Expand_N_Op_Abs;
3212 ---------------------
3213 -- Expand_N_Op_Add --
3214 ---------------------
3216 procedure Expand_N_Op_Add (N : Node_Id) is
3217 Typ : constant Entity_Id := Etype (N);
3220 Binary_Op_Validity_Checks (N);
3222 -- N + 0 = 0 + N = N for integer types
3224 if Is_Integer_Type (Typ) then
3225 if Compile_Time_Known_Value (Right_Opnd (N))
3226 and then Expr_Value (Right_Opnd (N)) = Uint_0
3228 Rewrite (N, Left_Opnd (N));
3231 elsif Compile_Time_Known_Value (Left_Opnd (N))
3232 and then Expr_Value (Left_Opnd (N)) = Uint_0
3234 Rewrite (N, Right_Opnd (N));
3239 -- Arithmetic overflow checks for signed integer/fixed point types
3241 if Is_Signed_Integer_Type (Typ)
3242 or else Is_Fixed_Point_Type (Typ)
3244 Apply_Arithmetic_Overflow_Check (N);
3247 -- Vax floating-point types case
3249 elsif Vax_Float (Typ) then
3250 Expand_Vax_Arith (N);
3252 end Expand_N_Op_Add;
3254 ---------------------
3255 -- Expand_N_Op_And --
3256 ---------------------
3258 procedure Expand_N_Op_And (N : Node_Id) is
3259 Typ : constant Entity_Id := Etype (N);
3262 Binary_Op_Validity_Checks (N);
3264 if Is_Array_Type (Etype (N)) then
3265 Expand_Boolean_Operator (N);
3267 elsif Is_Boolean_Type (Etype (N)) then
3268 Adjust_Condition (Left_Opnd (N));
3269 Adjust_Condition (Right_Opnd (N));
3270 Set_Etype (N, Standard_Boolean);
3271 Adjust_Result_Type (N, Typ);
3273 end Expand_N_Op_And;
3275 ------------------------
3276 -- Expand_N_Op_Concat --
3277 ------------------------
3279 Max_Available_String_Operands : Int := -1;
3280 -- This is initialized the first time this routine is called. It records
3281 -- a value of 0,2,3,4,5 depending on what Str_Concat_n procedures are
3282 -- available in the run-time:
3285 -- 2 RE_Str_Concat available, RE_Str_Concat_3 not available
3286 -- 3 RE_Str_Concat/Concat_2 available, RE_Str_Concat_4 not available
3287 -- 4 RE_Str_Concat/Concat_2/3 available, RE_Str_Concat_5 not available
3288 -- 5 All routines including RE_Str_Concat_5 available
3290 Char_Concat_Available : Boolean;
3291 -- Records if the routines RE_Str_Concat_CC/CS/SC are available. True if
3292 -- all three are available, False if any one of these is unavailable.
3294 procedure Expand_N_Op_Concat (N : Node_Id) is
3297 -- List of operands to be concatenated
3300 -- Single operand for concatenation
3303 -- Node which is to be replaced by the result of concatenating
3304 -- the nodes in the list Opnds.
3307 -- Array type of concatenation result type
3310 -- Component type of concatenation represented by Cnode
3313 -- Initialize global variables showing run-time status
3315 if Max_Available_String_Operands < 1 then
3316 if not RTE_Available (RE_Str_Concat) then
3317 Max_Available_String_Operands := 0;
3318 elsif not RTE_Available (RE_Str_Concat_3) then
3319 Max_Available_String_Operands := 2;
3320 elsif not RTE_Available (RE_Str_Concat_4) then
3321 Max_Available_String_Operands := 3;
3322 elsif not RTE_Available (RE_Str_Concat_5) then
3323 Max_Available_String_Operands := 4;
3325 Max_Available_String_Operands := 5;
3328 Char_Concat_Available :=
3329 RTE_Available (RE_Str_Concat_CC)
3331 RTE_Available (RE_Str_Concat_CS)
3333 RTE_Available (RE_Str_Concat_SC);
3336 -- Ensure validity of both operands
3338 Binary_Op_Validity_Checks (N);
3340 -- If we are the left operand of a concatenation higher up the
3341 -- tree, then do nothing for now, since we want to deal with a
3342 -- series of concatenations as a unit.
3344 if Nkind (Parent (N)) = N_Op_Concat
3345 and then N = Left_Opnd (Parent (N))
3350 -- We get here with a concatenation whose left operand may be a
3351 -- concatenation itself with a consistent type. We need to process
3352 -- these concatenation operands from left to right, which means
3353 -- from the deepest node in the tree to the highest node.
3356 while Nkind (Left_Opnd (Cnode)) = N_Op_Concat loop
3357 Cnode := Left_Opnd (Cnode);
3360 -- Now Opnd is the deepest Opnd, and its parents are the concatenation
3361 -- nodes above, so now we process bottom up, doing the operations. We
3362 -- gather a string that is as long as possible up to five operands
3364 -- The outer loop runs more than once if there are more than five
3365 -- concatenations of type Standard.String, the most we handle for
3366 -- this case, or if more than one concatenation type is involved.
3369 Opnds := New_List (Left_Opnd (Cnode), Right_Opnd (Cnode));
3370 Set_Parent (Opnds, N);
3372 -- The inner loop gathers concatenation operands. We gather any
3373 -- number of these in the non-string case, or if no concatenation
3374 -- routines are available for string (since in that case we will
3375 -- treat string like any other non-string case). Otherwise we only
3376 -- gather as many operands as can be handled by the available
3377 -- procedures in the run-time library (normally 5, but may be
3378 -- less for the configurable run-time case).
3380 Inner : while Cnode /= N
3381 and then (Base_Type (Etype (Cnode)) /= Standard_String
3383 Max_Available_String_Operands = 0
3385 List_Length (Opnds) <
3386 Max_Available_String_Operands)
3387 and then Base_Type (Etype (Cnode)) =
3388 Base_Type (Etype (Parent (Cnode)))
3390 Cnode := Parent (Cnode);
3391 Append (Right_Opnd (Cnode), Opnds);
3394 -- Here we process the collected operands. First we convert
3395 -- singleton operands to singleton aggregates. This is skipped
3396 -- however for the case of two operands of type String, since
3397 -- we have special routines for these cases.
3399 Atyp := Base_Type (Etype (Cnode));
3400 Ctyp := Base_Type (Component_Type (Etype (Cnode)));
3402 if (List_Length (Opnds) > 2 or else Atyp /= Standard_String)
3403 or else not Char_Concat_Available
3405 Opnd := First (Opnds);
3407 if Base_Type (Etype (Opnd)) = Ctyp then
3409 Make_Aggregate (Sloc (Cnode),
3410 Expressions => New_List (Relocate_Node (Opnd))));
3411 Analyze_And_Resolve (Opnd, Atyp);
3415 exit when No (Opnd);
3419 -- Now call appropriate continuation routine
3421 if Atyp = Standard_String
3422 and then Max_Available_String_Operands > 0
3424 Expand_Concatenate_String (Cnode, Opnds);
3426 Expand_Concatenate_Other (Cnode, Opnds);
3429 exit Outer when Cnode = N;
3430 Cnode := Parent (Cnode);
3432 end Expand_N_Op_Concat;
3434 ------------------------
3435 -- Expand_N_Op_Divide --
3436 ------------------------
3438 procedure Expand_N_Op_Divide (N : Node_Id) is
3439 Loc : constant Source_Ptr := Sloc (N);
3440 Ltyp : constant Entity_Id := Etype (Left_Opnd (N));
3441 Rtyp : constant Entity_Id := Etype (Right_Opnd (N));
3442 Typ : Entity_Id := Etype (N);
3445 Binary_Op_Validity_Checks (N);
3447 -- Vax_Float is a special case
3449 if Vax_Float (Typ) then
3450 Expand_Vax_Arith (N);
3454 -- N / 1 = N for integer types
3456 if Is_Integer_Type (Typ)
3457 and then Compile_Time_Known_Value (Right_Opnd (N))
3458 and then Expr_Value (Right_Opnd (N)) = Uint_1
3460 Rewrite (N, Left_Opnd (N));
3464 -- Convert x / 2 ** y to Shift_Right (x, y). Note that the fact that
3465 -- Is_Power_Of_2_For_Shift is set means that we know that our left
3466 -- operand is an unsigned integer, as required for this to work.
3468 if Nkind (Right_Opnd (N)) = N_Op_Expon
3469 and then Is_Power_Of_2_For_Shift (Right_Opnd (N))
3471 -- We cannot do this transformation in configurable run time mode if we
3472 -- have 64-bit -- integers and long shifts are not available.
3476 or else Support_Long_Shifts_On_Target)
3479 Make_Op_Shift_Right (Loc,
3480 Left_Opnd => Left_Opnd (N),
3482 Convert_To (Standard_Natural, Right_Opnd (Right_Opnd (N)))));
3483 Analyze_And_Resolve (N, Typ);
3487 -- Do required fixup of universal fixed operation
3489 if Typ = Universal_Fixed then
3490 Fixup_Universal_Fixed_Operation (N);
3494 -- Divisions with fixed-point results
3496 if Is_Fixed_Point_Type (Typ) then
3498 -- No special processing if Treat_Fixed_As_Integer is set,
3499 -- since from a semantic point of view such operations are
3500 -- simply integer operations and will be treated that way.
3502 if not Treat_Fixed_As_Integer (N) then
3503 if Is_Integer_Type (Rtyp) then
3504 Expand_Divide_Fixed_By_Integer_Giving_Fixed (N);
3506 Expand_Divide_Fixed_By_Fixed_Giving_Fixed (N);
3510 -- Other cases of division of fixed-point operands. Again we
3511 -- exclude the case where Treat_Fixed_As_Integer is set.
3513 elsif (Is_Fixed_Point_Type (Ltyp) or else
3514 Is_Fixed_Point_Type (Rtyp))
3515 and then not Treat_Fixed_As_Integer (N)
3517 if Is_Integer_Type (Typ) then
3518 Expand_Divide_Fixed_By_Fixed_Giving_Integer (N);
3520 pragma Assert (Is_Floating_Point_Type (Typ));
3521 Expand_Divide_Fixed_By_Fixed_Giving_Float (N);
3524 -- Mixed-mode operations can appear in a non-static universal
3525 -- context, in which case the integer argument must be converted
3528 elsif Typ = Universal_Real
3529 and then Is_Integer_Type (Rtyp)
3531 Rewrite (Right_Opnd (N),
3532 Convert_To (Universal_Real, Relocate_Node (Right_Opnd (N))));
3534 Analyze_And_Resolve (Right_Opnd (N), Universal_Real);
3536 elsif Typ = Universal_Real
3537 and then Is_Integer_Type (Ltyp)
3539 Rewrite (Left_Opnd (N),
3540 Convert_To (Universal_Real, Relocate_Node (Left_Opnd (N))));
3542 Analyze_And_Resolve (Left_Opnd (N), Universal_Real);
3544 -- Non-fixed point cases, do zero divide and overflow checks
3546 elsif Is_Integer_Type (Typ) then
3547 Apply_Divide_Check (N);
3549 -- Check for 64-bit division available
3551 if Esize (Ltyp) > 32
3552 and then not Support_64_Bit_Divides_On_Target
3554 Error_Msg_CRT ("64-bit division", N);
3557 end Expand_N_Op_Divide;
3559 --------------------
3560 -- Expand_N_Op_Eq --
3561 --------------------
3563 procedure Expand_N_Op_Eq (N : Node_Id) is
3564 Loc : constant Source_Ptr := Sloc (N);
3565 Typ : constant Entity_Id := Etype (N);
3566 Lhs : constant Node_Id := Left_Opnd (N);
3567 Rhs : constant Node_Id := Right_Opnd (N);
3568 Bodies : constant List_Id := New_List;
3569 A_Typ : constant Entity_Id := Etype (Lhs);
3571 Typl : Entity_Id := A_Typ;
3572 Op_Name : Entity_Id;
3575 procedure Build_Equality_Call (Eq : Entity_Id);
3576 -- If a constructed equality exists for the type or for its parent,
3577 -- build and analyze call, adding conversions if the operation is
3580 -------------------------
3581 -- Build_Equality_Call --
3582 -------------------------
3584 procedure Build_Equality_Call (Eq : Entity_Id) is
3585 Op_Type : constant Entity_Id := Etype (First_Formal (Eq));
3586 L_Exp : Node_Id := Relocate_Node (Lhs);
3587 R_Exp : Node_Id := Relocate_Node (Rhs);
3590 if Base_Type (Op_Type) /= Base_Type (A_Typ)
3591 and then not Is_Class_Wide_Type (A_Typ)
3593 L_Exp := OK_Convert_To (Op_Type, L_Exp);
3594 R_Exp := OK_Convert_To (Op_Type, R_Exp);
3598 Make_Function_Call (Loc,
3599 Name => New_Reference_To (Eq, Loc),
3600 Parameter_Associations => New_List (L_Exp, R_Exp)));
3602 Analyze_And_Resolve (N, Standard_Boolean, Suppress => All_Checks);
3603 end Build_Equality_Call;
3605 -- Start of processing for Expand_N_Op_Eq
3608 Binary_Op_Validity_Checks (N);
3610 if Ekind (Typl) = E_Private_Type then
3611 Typl := Underlying_Type (Typl);
3613 elsif Ekind (Typl) = E_Private_Subtype then
3614 Typl := Underlying_Type (Base_Type (Typl));
3617 -- It may happen in error situations that the underlying type is not
3618 -- set. The error will be detected later, here we just defend the
3625 Typl := Base_Type (Typl);
3629 if Vax_Float (Typl) then
3630 Expand_Vax_Comparison (N);
3633 -- Boolean types (requiring handling of non-standard case)
3635 elsif Is_Boolean_Type (Typl) then
3636 Adjust_Condition (Left_Opnd (N));
3637 Adjust_Condition (Right_Opnd (N));
3638 Set_Etype (N, Standard_Boolean);
3639 Adjust_Result_Type (N, Typ);
3643 elsif Is_Array_Type (Typl) then
3645 -- If we are doing full validity checking, then expand out array
3646 -- comparisons to make sure that we check the array elements.
3648 if Validity_Check_Operands then
3650 Save_Force_Validity_Checks : constant Boolean :=
3651 Force_Validity_Checks;
3653 Force_Validity_Checks := True;
3655 Expand_Array_Equality (N, Typl, A_Typ,
3656 Relocate_Node (Lhs), Relocate_Node (Rhs), Bodies));
3658 Insert_Actions (N, Bodies);
3659 Analyze_And_Resolve (N, Standard_Boolean);
3660 Force_Validity_Checks := Save_Force_Validity_Checks;
3665 elsif Is_Bit_Packed_Array (Typl) then
3666 Expand_Packed_Eq (N);
3668 -- For non-floating-point elementary types, the primitive equality
3669 -- always applies, and block-bit comparison is fine. Floating-point
3670 -- is an exception because of negative zeroes.
3672 elsif Is_Elementary_Type (Component_Type (Typl))
3673 and then not Is_Floating_Point_Type (Component_Type (Typl))
3674 and then Support_Composite_Compare_On_Target
3678 -- For composite and floating-point cases, expand equality loop
3679 -- to make sure of using proper comparisons for tagged types,
3680 -- and correctly handling the floating-point case.
3684 Expand_Array_Equality (N, Typl, A_Typ,
3685 Relocate_Node (Lhs), Relocate_Node (Rhs), Bodies));
3687 Insert_Actions (N, Bodies, Suppress => All_Checks);
3688 Analyze_And_Resolve (N, Standard_Boolean, Suppress => All_Checks);
3693 elsif Is_Record_Type (Typl) then
3695 -- For tagged types, use the primitive "="
3697 if Is_Tagged_Type (Typl) then
3699 -- If this is derived from an untagged private type completed
3700 -- with a tagged type, it does not have a full view, so we
3701 -- use the primitive operations of the private type.
3702 -- This check should no longer be necessary when these
3703 -- types receive their full views ???
3705 if Is_Private_Type (A_Typ)
3706 and then not Is_Tagged_Type (A_Typ)
3707 and then Is_Derived_Type (A_Typ)
3708 and then No (Full_View (A_Typ))
3710 Prim := First_Elmt (Collect_Primitive_Operations (A_Typ));
3712 while Chars (Node (Prim)) /= Name_Op_Eq loop
3714 pragma Assert (Present (Prim));
3717 Op_Name := Node (Prim);
3719 -- Find the type's predefined equality or an overriding
3720 -- user-defined equality. The reason for not simply calling
3721 -- Find_Prim_Op here is that there may be a user-defined
3722 -- overloaded equality op that precedes the equality that
3723 -- we want, so we have to explicitly search (e.g., there
3724 -- could be an equality with two different parameter types).
3727 if Is_Class_Wide_Type (Typl) then
3728 Typl := Root_Type (Typl);
3731 Prim := First_Elmt (Primitive_Operations (Typl));
3733 while Present (Prim) loop
3734 exit when Chars (Node (Prim)) = Name_Op_Eq
3735 and then Etype (First_Formal (Node (Prim))) =
3736 Etype (Next_Formal (First_Formal (Node (Prim))))
3738 Base_Type (Etype (Node (Prim))) = Standard_Boolean;
3741 pragma Assert (Present (Prim));
3744 Op_Name := Node (Prim);
3747 Build_Equality_Call (Op_Name);
3749 -- If a type support function is present (for complex cases), use it
3751 elsif Present (TSS (Root_Type (Typl), TSS_Composite_Equality)) then
3753 (TSS (Root_Type (Typl), TSS_Composite_Equality));
3755 -- Otherwise expand the component by component equality. Note that
3756 -- we never use block-bit coparisons for records, because of the
3757 -- problems with gaps. The backend will often be able to recombine
3758 -- the separate comparisons that we generate here.
3761 Remove_Side_Effects (Lhs);
3762 Remove_Side_Effects (Rhs);
3764 Expand_Record_Equality (N, Typl, Lhs, Rhs, Bodies));
3766 Insert_Actions (N, Bodies, Suppress => All_Checks);
3767 Analyze_And_Resolve (N, Standard_Boolean, Suppress => All_Checks);
3771 -- If we still have an equality comparison (i.e. it was not rewritten
3772 -- in some way), then we can test if result is needed at compile time).
3774 if Nkind (N) = N_Op_Eq then
3775 Rewrite_Comparison (N);
3779 -----------------------
3780 -- Expand_N_Op_Expon --
3781 -----------------------
3783 procedure Expand_N_Op_Expon (N : Node_Id) is
3784 Loc : constant Source_Ptr := Sloc (N);
3785 Typ : constant Entity_Id := Etype (N);
3786 Rtyp : constant Entity_Id := Root_Type (Typ);
3787 Base : constant Node_Id := Relocate_Node (Left_Opnd (N));
3788 Bastyp : constant Node_Id := Etype (Base);
3789 Exp : constant Node_Id := Relocate_Node (Right_Opnd (N));
3790 Exptyp : constant Entity_Id := Etype (Exp);
3791 Ovflo : constant Boolean := Do_Overflow_Check (N);
3800 Binary_Op_Validity_Checks (N);
3802 -- If either operand is of a private type, then we have the use of
3803 -- an intrinsic operator, and we get rid of the privateness, by using
3804 -- root types of underlying types for the actual operation. Otherwise
3805 -- the private types will cause trouble if we expand multiplications
3806 -- or shifts etc. We also do this transformation if the result type
3807 -- is different from the base type.
3809 if Is_Private_Type (Etype (Base))
3811 Is_Private_Type (Typ)
3813 Is_Private_Type (Exptyp)
3815 Rtyp /= Root_Type (Bastyp)
3818 Bt : constant Entity_Id := Root_Type (Underlying_Type (Bastyp));
3819 Et : constant Entity_Id := Root_Type (Underlying_Type (Exptyp));
3823 Unchecked_Convert_To (Typ,
3825 Left_Opnd => Unchecked_Convert_To (Bt, Base),
3826 Right_Opnd => Unchecked_Convert_To (Et, Exp))));
3827 Analyze_And_Resolve (N, Typ);
3832 -- Test for case of known right argument
3834 if Compile_Time_Known_Value (Exp) then
3835 Expv := Expr_Value (Exp);
3837 -- We only fold small non-negative exponents. You might think we
3838 -- could fold small negative exponents for the real case, but we
3839 -- can't because we are required to raise Constraint_Error for
3840 -- the case of 0.0 ** (negative) even if Machine_Overflows = False.
3841 -- See ACVC test C4A012B.
3843 if Expv >= 0 and then Expv <= 4 then
3845 -- X ** 0 = 1 (or 1.0)
3848 if Ekind (Typ) in Integer_Kind then
3849 Xnode := Make_Integer_Literal (Loc, Intval => 1);
3851 Xnode := Make_Real_Literal (Loc, Ureal_1);
3863 Make_Op_Multiply (Loc,
3864 Left_Opnd => Duplicate_Subexpr (Base),
3865 Right_Opnd => Duplicate_Subexpr_No_Checks (Base));
3867 -- X ** 3 = X * X * X
3871 Make_Op_Multiply (Loc,
3873 Make_Op_Multiply (Loc,
3874 Left_Opnd => Duplicate_Subexpr (Base),
3875 Right_Opnd => Duplicate_Subexpr_No_Checks (Base)),
3876 Right_Opnd => Duplicate_Subexpr_No_Checks (Base));
3879 -- En : constant base'type := base * base;
3885 Make_Defining_Identifier (Loc, New_Internal_Name ('E'));
3887 Insert_Actions (N, New_List (
3888 Make_Object_Declaration (Loc,
3889 Defining_Identifier => Temp,
3890 Constant_Present => True,
3891 Object_Definition => New_Reference_To (Typ, Loc),
3893 Make_Op_Multiply (Loc,
3894 Left_Opnd => Duplicate_Subexpr (Base),
3895 Right_Opnd => Duplicate_Subexpr_No_Checks (Base)))));
3898 Make_Op_Multiply (Loc,
3899 Left_Opnd => New_Reference_To (Temp, Loc),
3900 Right_Opnd => New_Reference_To (Temp, Loc));
3904 Analyze_And_Resolve (N, Typ);
3909 -- Case of (2 ** expression) appearing as an argument of an integer
3910 -- multiplication, or as the right argument of a division of a non-
3911 -- negative integer. In such cases we leave the node untouched, setting
3912 -- the flag Is_Natural_Power_Of_2_for_Shift set, then the expansion
3913 -- of the higher level node converts it into a shift.
3915 if Nkind (Base) = N_Integer_Literal
3916 and then Intval (Base) = 2
3917 and then Is_Integer_Type (Root_Type (Exptyp))
3918 and then Esize (Root_Type (Exptyp)) <= Esize (Standard_Integer)
3919 and then Is_Unsigned_Type (Exptyp)
3921 and then Nkind (Parent (N)) in N_Binary_Op
3924 P : constant Node_Id := Parent (N);
3925 L : constant Node_Id := Left_Opnd (P);
3926 R : constant Node_Id := Right_Opnd (P);
3929 if (Nkind (P) = N_Op_Multiply
3931 ((Is_Integer_Type (Etype (L)) and then R = N)
3933 (Is_Integer_Type (Etype (R)) and then L = N))
3934 and then not Do_Overflow_Check (P))
3937 (Nkind (P) = N_Op_Divide
3938 and then Is_Integer_Type (Etype (L))
3939 and then Is_Unsigned_Type (Etype (L))
3941 and then not Do_Overflow_Check (P))
3943 Set_Is_Power_Of_2_For_Shift (N);
3949 -- Fall through if exponentiation must be done using a runtime routine
3951 -- First deal with modular case
3953 if Is_Modular_Integer_Type (Rtyp) then
3955 -- Non-binary case, we call the special exponentiation routine for
3956 -- the non-binary case, converting the argument to Long_Long_Integer
3957 -- and passing the modulus value. Then the result is converted back
3958 -- to the base type.
3960 if Non_Binary_Modulus (Rtyp) then
3963 Make_Function_Call (Loc,
3964 Name => New_Reference_To (RTE (RE_Exp_Modular), Loc),
3965 Parameter_Associations => New_List (
3966 Convert_To (Standard_Integer, Base),
3967 Make_Integer_Literal (Loc, Modulus (Rtyp)),
3970 -- Binary case, in this case, we call one of two routines, either
3971 -- the unsigned integer case, or the unsigned long long integer
3972 -- case, with a final "and" operation to do the required mod.
3975 if UI_To_Int (Esize (Rtyp)) <= Standard_Integer_Size then
3976 Ent := RTE (RE_Exp_Unsigned);
3978 Ent := RTE (RE_Exp_Long_Long_Unsigned);
3985 Make_Function_Call (Loc,
3986 Name => New_Reference_To (Ent, Loc),
3987 Parameter_Associations => New_List (
3988 Convert_To (Etype (First_Formal (Ent)), Base),
3991 Make_Integer_Literal (Loc, Modulus (Rtyp) - 1))));
3995 -- Common exit point for modular type case
3997 Analyze_And_Resolve (N, Typ);
4000 -- Signed integer cases, done using either Integer or Long_Long_Integer.
4001 -- It is not worth having routines for Short_[Short_]Integer, since for
4002 -- most machines it would not help, and it would generate more code that
4003 -- might need certification in the HI-E case.
4005 -- In the integer cases, we have two routines, one for when overflow
4006 -- checks are required, and one when they are not required, since
4007 -- there is a real gain in ommitting checks on many machines.
4009 elsif Rtyp = Base_Type (Standard_Long_Long_Integer)
4010 or else (Rtyp = Base_Type (Standard_Long_Integer)
4012 Esize (Standard_Long_Integer) > Esize (Standard_Integer))
4013 or else (Rtyp = Universal_Integer)
4015 Etyp := Standard_Long_Long_Integer;
4018 Rent := RE_Exp_Long_Long_Integer;
4020 Rent := RE_Exn_Long_Long_Integer;
4023 elsif Is_Signed_Integer_Type (Rtyp) then
4024 Etyp := Standard_Integer;
4027 Rent := RE_Exp_Integer;
4029 Rent := RE_Exn_Integer;
4032 -- Floating-point cases, always done using Long_Long_Float. We do not
4033 -- need separate routines for the overflow case here, since in the case
4034 -- of floating-point, we generate infinities anyway as a rule (either
4035 -- that or we automatically trap overflow), and if there is an infinity
4036 -- generated and a range check is required, the check will fail anyway.
4039 pragma Assert (Is_Floating_Point_Type (Rtyp));
4040 Etyp := Standard_Long_Long_Float;
4041 Rent := RE_Exn_Long_Long_Float;
4044 -- Common processing for integer cases and floating-point cases.
4045 -- If we are in the right type, we can call runtime routine directly
4048 and then Rtyp /= Universal_Integer
4049 and then Rtyp /= Universal_Real
4052 Make_Function_Call (Loc,
4053 Name => New_Reference_To (RTE (Rent), Loc),
4054 Parameter_Associations => New_List (Base, Exp)));
4056 -- Otherwise we have to introduce conversions (conversions are also
4057 -- required in the universal cases, since the runtime routine is
4058 -- typed using one of the standard types.
4063 Make_Function_Call (Loc,
4064 Name => New_Reference_To (RTE (Rent), Loc),
4065 Parameter_Associations => New_List (
4066 Convert_To (Etyp, Base),
4070 Analyze_And_Resolve (N, Typ);
4074 when RE_Not_Available =>
4076 end Expand_N_Op_Expon;
4078 --------------------
4079 -- Expand_N_Op_Ge --
4080 --------------------
4082 procedure Expand_N_Op_Ge (N : Node_Id) is
4083 Typ : constant Entity_Id := Etype (N);
4084 Op1 : constant Node_Id := Left_Opnd (N);
4085 Op2 : constant Node_Id := Right_Opnd (N);
4086 Typ1 : constant Entity_Id := Base_Type (Etype (Op1));
4089 Binary_Op_Validity_Checks (N);
4091 if Vax_Float (Typ1) then
4092 Expand_Vax_Comparison (N);
4095 elsif Is_Array_Type (Typ1) then
4096 Expand_Array_Comparison (N);
4100 if Is_Boolean_Type (Typ1) then
4101 Adjust_Condition (Op1);
4102 Adjust_Condition (Op2);
4103 Set_Etype (N, Standard_Boolean);
4104 Adjust_Result_Type (N, Typ);
4107 Rewrite_Comparison (N);
4110 --------------------
4111 -- Expand_N_Op_Gt --
4112 --------------------
4114 procedure Expand_N_Op_Gt (N : Node_Id) is
4115 Typ : constant Entity_Id := Etype (N);
4116 Op1 : constant Node_Id := Left_Opnd (N);
4117 Op2 : constant Node_Id := Right_Opnd (N);
4118 Typ1 : constant Entity_Id := Base_Type (Etype (Op1));
4121 Binary_Op_Validity_Checks (N);
4123 if Vax_Float (Typ1) then
4124 Expand_Vax_Comparison (N);
4127 elsif Is_Array_Type (Typ1) then
4128 Expand_Array_Comparison (N);
4132 if Is_Boolean_Type (Typ1) then
4133 Adjust_Condition (Op1);
4134 Adjust_Condition (Op2);
4135 Set_Etype (N, Standard_Boolean);
4136 Adjust_Result_Type (N, Typ);
4139 Rewrite_Comparison (N);
4142 --------------------
4143 -- Expand_N_Op_Le --
4144 --------------------
4146 procedure Expand_N_Op_Le (N : Node_Id) is
4147 Typ : constant Entity_Id := Etype (N);
4148 Op1 : constant Node_Id := Left_Opnd (N);
4149 Op2 : constant Node_Id := Right_Opnd (N);
4150 Typ1 : constant Entity_Id := Base_Type (Etype (Op1));
4153 Binary_Op_Validity_Checks (N);
4155 if Vax_Float (Typ1) then
4156 Expand_Vax_Comparison (N);
4159 elsif Is_Array_Type (Typ1) then
4160 Expand_Array_Comparison (N);
4164 if Is_Boolean_Type (Typ1) then
4165 Adjust_Condition (Op1);
4166 Adjust_Condition (Op2);
4167 Set_Etype (N, Standard_Boolean);
4168 Adjust_Result_Type (N, Typ);
4171 Rewrite_Comparison (N);
4174 --------------------
4175 -- Expand_N_Op_Lt --
4176 --------------------
4178 procedure Expand_N_Op_Lt (N : Node_Id) is
4179 Typ : constant Entity_Id := Etype (N);
4180 Op1 : constant Node_Id := Left_Opnd (N);
4181 Op2 : constant Node_Id := Right_Opnd (N);
4182 Typ1 : constant Entity_Id := Base_Type (Etype (Op1));
4185 Binary_Op_Validity_Checks (N);
4187 if Vax_Float (Typ1) then
4188 Expand_Vax_Comparison (N);
4191 elsif Is_Array_Type (Typ1) then
4192 Expand_Array_Comparison (N);
4196 if Is_Boolean_Type (Typ1) then
4197 Adjust_Condition (Op1);
4198 Adjust_Condition (Op2);
4199 Set_Etype (N, Standard_Boolean);
4200 Adjust_Result_Type (N, Typ);
4203 Rewrite_Comparison (N);
4206 -----------------------
4207 -- Expand_N_Op_Minus --
4208 -----------------------
4210 procedure Expand_N_Op_Minus (N : Node_Id) is
4211 Loc : constant Source_Ptr := Sloc (N);
4212 Typ : constant Entity_Id := Etype (N);
4215 Unary_Op_Validity_Checks (N);
4217 if not Backend_Overflow_Checks_On_Target
4218 and then Is_Signed_Integer_Type (Etype (N))
4219 and then Do_Overflow_Check (N)
4221 -- Software overflow checking expands -expr into (0 - expr)
4224 Make_Op_Subtract (Loc,
4225 Left_Opnd => Make_Integer_Literal (Loc, 0),
4226 Right_Opnd => Right_Opnd (N)));
4228 Analyze_And_Resolve (N, Typ);
4230 -- Vax floating-point types case
4232 elsif Vax_Float (Etype (N)) then
4233 Expand_Vax_Arith (N);
4235 end Expand_N_Op_Minus;
4237 ---------------------
4238 -- Expand_N_Op_Mod --
4239 ---------------------
4241 procedure Expand_N_Op_Mod (N : Node_Id) is
4242 Loc : constant Source_Ptr := Sloc (N);
4243 Typ : constant Entity_Id := Etype (N);
4244 Left : constant Node_Id := Left_Opnd (N);
4245 Right : constant Node_Id := Right_Opnd (N);
4246 DOC : constant Boolean := Do_Overflow_Check (N);
4247 DDC : constant Boolean := Do_Division_Check (N);
4258 Binary_Op_Validity_Checks (N);
4260 Determine_Range (Right, ROK, Rlo, Rhi);
4261 Determine_Range (Left, LOK, Llo, Lhi);
4263 -- Convert mod to rem if operands are known non-negative. We do this
4264 -- since it is quite likely that this will improve the quality of code,
4265 -- (the operation now corresponds to the hardware remainder), and it
4266 -- does not seem likely that it could be harmful.
4268 if LOK and then Llo >= 0
4270 ROK and then Rlo >= 0
4273 Make_Op_Rem (Sloc (N),
4274 Left_Opnd => Left_Opnd (N),
4275 Right_Opnd => Right_Opnd (N)));
4277 -- Instead of reanalyzing the node we do the analysis manually.
4278 -- This avoids anomalies when the replacement is done in an
4279 -- instance and is epsilon more efficient.
4281 Set_Entity (N, Standard_Entity (S_Op_Rem));
4283 Set_Do_Overflow_Check (N, DOC);
4284 Set_Do_Division_Check (N, DDC);
4285 Expand_N_Op_Rem (N);
4288 -- Otherwise, normal mod processing
4291 if Is_Integer_Type (Etype (N)) then
4292 Apply_Divide_Check (N);
4295 -- Apply optimization x mod 1 = 0. We don't really need that with
4296 -- gcc, but it is useful with other back ends (e.g. AAMP), and is
4297 -- certainly harmless.
4299 if Is_Integer_Type (Etype (N))
4300 and then Compile_Time_Known_Value (Right)
4301 and then Expr_Value (Right) = Uint_1
4303 Rewrite (N, Make_Integer_Literal (Loc, 0));
4304 Analyze_And_Resolve (N, Typ);
4308 -- Deal with annoying case of largest negative number remainder
4309 -- minus one. Gigi does not handle this case correctly, because
4310 -- it generates a divide instruction which may trap in this case.
4312 -- In fact the check is quite easy, if the right operand is -1,
4313 -- then the mod value is always 0, and we can just ignore the
4314 -- left operand completely in this case.
4316 -- The operand type may be private (e.g. in the expansion of an
4317 -- an intrinsic operation) so we must use the underlying type to
4318 -- get the bounds, and convert the literals explicitly.
4322 (Type_Low_Bound (Base_Type (Underlying_Type (Etype (Left)))));
4324 if ((not ROK) or else (Rlo <= (-1) and then (-1) <= Rhi))
4326 ((not LOK) or else (Llo = LLB))
4329 Make_Conditional_Expression (Loc,
4330 Expressions => New_List (
4332 Left_Opnd => Duplicate_Subexpr (Right),
4334 Unchecked_Convert_To (Typ,
4335 Make_Integer_Literal (Loc, -1))),
4336 Unchecked_Convert_To (Typ,
4337 Make_Integer_Literal (Loc, Uint_0)),
4338 Relocate_Node (N))));
4340 Set_Analyzed (Next (Next (First (Expressions (N)))));
4341 Analyze_And_Resolve (N, Typ);
4344 end Expand_N_Op_Mod;
4346 --------------------------
4347 -- Expand_N_Op_Multiply --
4348 --------------------------
4350 procedure Expand_N_Op_Multiply (N : Node_Id) is
4351 Loc : constant Source_Ptr := Sloc (N);
4352 Lop : constant Node_Id := Left_Opnd (N);
4353 Rop : constant Node_Id := Right_Opnd (N);
4355 Lp2 : constant Boolean :=
4356 Nkind (Lop) = N_Op_Expon
4357 and then Is_Power_Of_2_For_Shift (Lop);
4359 Rp2 : constant Boolean :=
4360 Nkind (Rop) = N_Op_Expon
4361 and then Is_Power_Of_2_For_Shift (Rop);
4363 Ltyp : constant Entity_Id := Etype (Lop);
4364 Rtyp : constant Entity_Id := Etype (Rop);
4365 Typ : Entity_Id := Etype (N);
4368 Binary_Op_Validity_Checks (N);
4370 -- Special optimizations for integer types
4372 if Is_Integer_Type (Typ) then
4374 -- N * 0 = 0 * N = 0 for integer types
4376 if (Compile_Time_Known_Value (Rop)
4377 and then Expr_Value (Rop) = Uint_0)
4379 (Compile_Time_Known_Value (Lop)
4380 and then Expr_Value (Lop) = Uint_0)
4382 Rewrite (N, Make_Integer_Literal (Loc, Uint_0));
4383 Analyze_And_Resolve (N, Typ);
4387 -- N * 1 = 1 * N = N for integer types
4389 -- This optimisation is not done if we are going to
4390 -- rewrite the product 1 * 2 ** N to a shift.
4392 if Compile_Time_Known_Value (Rop)
4393 and then Expr_Value (Rop) = Uint_1
4399 elsif Compile_Time_Known_Value (Lop)
4400 and then Expr_Value (Lop) = Uint_1
4408 -- Deal with VAX float case
4410 if Vax_Float (Typ) then
4411 Expand_Vax_Arith (N);
4415 -- Convert x * 2 ** y to Shift_Left (x, y). Note that the fact that
4416 -- Is_Power_Of_2_For_Shift is set means that we know that our left
4417 -- operand is an integer, as required for this to work.
4422 -- Convert 2 ** A * 2 ** B into 2 ** (A + B)
4426 Left_Opnd => Make_Integer_Literal (Loc, 2),
4429 Left_Opnd => Right_Opnd (Lop),
4430 Right_Opnd => Right_Opnd (Rop))));
4431 Analyze_And_Resolve (N, Typ);
4436 Make_Op_Shift_Left (Loc,
4439 Convert_To (Standard_Natural, Right_Opnd (Rop))));
4440 Analyze_And_Resolve (N, Typ);
4444 -- Same processing for the operands the other way round
4448 Make_Op_Shift_Left (Loc,
4451 Convert_To (Standard_Natural, Right_Opnd (Lop))));
4452 Analyze_And_Resolve (N, Typ);
4456 -- Do required fixup of universal fixed operation
4458 if Typ = Universal_Fixed then
4459 Fixup_Universal_Fixed_Operation (N);
4463 -- Multiplications with fixed-point results
4465 if Is_Fixed_Point_Type (Typ) then
4467 -- No special processing if Treat_Fixed_As_Integer is set,
4468 -- since from a semantic point of view such operations are
4469 -- simply integer operations and will be treated that way.
4471 if not Treat_Fixed_As_Integer (N) then
4473 -- Case of fixed * integer => fixed
4475 if Is_Integer_Type (Rtyp) then
4476 Expand_Multiply_Fixed_By_Integer_Giving_Fixed (N);
4478 -- Case of integer * fixed => fixed
4480 elsif Is_Integer_Type (Ltyp) then
4481 Expand_Multiply_Integer_By_Fixed_Giving_Fixed (N);
4483 -- Case of fixed * fixed => fixed
4486 Expand_Multiply_Fixed_By_Fixed_Giving_Fixed (N);
4490 -- Other cases of multiplication of fixed-point operands. Again
4491 -- we exclude the cases where Treat_Fixed_As_Integer flag is set.
4493 elsif (Is_Fixed_Point_Type (Ltyp) or else Is_Fixed_Point_Type (Rtyp))
4494 and then not Treat_Fixed_As_Integer (N)
4496 if Is_Integer_Type (Typ) then
4497 Expand_Multiply_Fixed_By_Fixed_Giving_Integer (N);
4499 pragma Assert (Is_Floating_Point_Type (Typ));
4500 Expand_Multiply_Fixed_By_Fixed_Giving_Float (N);
4503 -- Mixed-mode operations can appear in a non-static universal
4504 -- context, in which case the integer argument must be converted
4507 elsif Typ = Universal_Real
4508 and then Is_Integer_Type (Rtyp)
4510 Rewrite (Rop, Convert_To (Universal_Real, Relocate_Node (Rop)));
4512 Analyze_And_Resolve (Rop, Universal_Real);
4514 elsif Typ = Universal_Real
4515 and then Is_Integer_Type (Ltyp)
4517 Rewrite (Lop, Convert_To (Universal_Real, Relocate_Node (Lop)));
4519 Analyze_And_Resolve (Lop, Universal_Real);
4521 -- Non-fixed point cases, check software overflow checking required
4523 elsif Is_Signed_Integer_Type (Etype (N)) then
4524 Apply_Arithmetic_Overflow_Check (N);
4526 end Expand_N_Op_Multiply;
4528 --------------------
4529 -- Expand_N_Op_Ne --
4530 --------------------
4532 -- Rewrite node as the negation of an equality operation, and reanalyze.
4533 -- The equality to be used is defined in the same scope and has the same
4534 -- signature. It must be set explicitly because in an instance it may not
4535 -- have the same visibility as in the generic unit.
4537 procedure Expand_N_Op_Ne (N : Node_Id) is
4538 Loc : constant Source_Ptr := Sloc (N);
4540 Ne : constant Entity_Id := Entity (N);
4543 Binary_Op_Validity_Checks (N);
4549 Left_Opnd => Left_Opnd (N),
4550 Right_Opnd => Right_Opnd (N)));
4551 Set_Paren_Count (Right_Opnd (Neg), 1);
4553 if Scope (Ne) /= Standard_Standard then
4554 Set_Entity (Right_Opnd (Neg), Corresponding_Equality (Ne));
4557 -- For navigation purposes, the inequality is treated as an implicit
4558 -- reference to the corresponding equality. Preserve the Comes_From_
4559 -- source flag so that the proper Xref entry is generated.
4561 Preserve_Comes_From_Source (Neg, N);
4562 Preserve_Comes_From_Source (Right_Opnd (Neg), N);
4564 Analyze_And_Resolve (N, Standard_Boolean);
4567 ---------------------
4568 -- Expand_N_Op_Not --
4569 ---------------------
4571 -- If the argument is other than a Boolean array type, there is no
4572 -- special expansion required.
4574 -- For the packed case, we call the special routine in Exp_Pakd, except
4575 -- that if the component size is greater than one, we use the standard
4576 -- routine generating a gruesome loop (it is so peculiar to have packed
4577 -- arrays with non-standard Boolean representations anyway, so it does
4578 -- not matter that we do not handle this case efficiently).
4580 -- For the unpacked case (and for the special packed case where we have
4581 -- non standard Booleans, as discussed above), we generate and insert
4582 -- into the tree the following function definition:
4584 -- function Nnnn (A : arr) is
4587 -- for J in a'range loop
4588 -- B (J) := not A (J);
4593 -- Here arr is the actual subtype of the parameter (and hence always
4594 -- constrained). Then we replace the not with a call to this function.
4596 procedure Expand_N_Op_Not (N : Node_Id) is
4597 Loc : constant Source_Ptr := Sloc (N);
4598 Typ : constant Entity_Id := Etype (N);
4607 Func_Name : Entity_Id;
4608 Loop_Statement : Node_Id;
4611 Unary_Op_Validity_Checks (N);
4613 -- For boolean operand, deal with non-standard booleans
4615 if Is_Boolean_Type (Typ) then
4616 Adjust_Condition (Right_Opnd (N));
4617 Set_Etype (N, Standard_Boolean);
4618 Adjust_Result_Type (N, Typ);
4622 -- Only array types need any other processing
4624 if not Is_Array_Type (Typ) then
4628 -- Case of array operand. If bit packed, handle it in Exp_Pakd
4630 if Is_Bit_Packed_Array (Typ) and then Component_Size (Typ) = 1 then
4631 Expand_Packed_Not (N);
4635 -- Case of array operand which is not bit-packed. If the context is
4636 -- a safe assignment, call in-place operation, If context is a larger
4637 -- boolean expression in the context of a safe assignment, expansion is
4638 -- done by enclosing operation.
4640 Opnd := Relocate_Node (Right_Opnd (N));
4641 Convert_To_Actual_Subtype (Opnd);
4642 Arr := Etype (Opnd);
4643 Ensure_Defined (Arr, N);
4645 if Nkind (Parent (N)) = N_Assignment_Statement then
4646 if Safe_In_Place_Array_Op (Name (Parent (N)), N, Empty) then
4647 Build_Boolean_Array_Proc_Call (Parent (N), Opnd, Empty);
4650 -- Special case the negation of a binary operation.
4652 elsif (Nkind (Opnd) = N_Op_And
4653 or else Nkind (Opnd) = N_Op_Or
4654 or else Nkind (Opnd) = N_Op_Xor)
4655 and then Safe_In_Place_Array_Op
4656 (Name (Parent (N)), Left_Opnd (Opnd), Right_Opnd (Opnd))
4658 Build_Boolean_Array_Proc_Call (Parent (N), Opnd, Empty);
4662 elsif Nkind (Parent (N)) in N_Binary_Op
4663 and then Nkind (Parent (Parent (N))) = N_Assignment_Statement
4666 Op1 : constant Node_Id := Left_Opnd (Parent (N));
4667 Op2 : constant Node_Id := Right_Opnd (Parent (N));
4668 Lhs : constant Node_Id := Name (Parent (Parent (N)));
4671 if Safe_In_Place_Array_Op (Lhs, Op1, Op2) then
4673 and then Nkind (Op2) = N_Op_Not
4675 -- (not A) op (not B) can be reduced to a single call.
4680 and then Nkind (Parent (N)) = N_Op_Xor
4682 -- A xor (not B) can also be special-cased.
4690 A := Make_Defining_Identifier (Loc, Name_uA);
4691 B := Make_Defining_Identifier (Loc, Name_uB);
4692 J := Make_Defining_Identifier (Loc, Name_uJ);
4695 Make_Indexed_Component (Loc,
4696 Prefix => New_Reference_To (A, Loc),
4697 Expressions => New_List (New_Reference_To (J, Loc)));
4700 Make_Indexed_Component (Loc,
4701 Prefix => New_Reference_To (B, Loc),
4702 Expressions => New_List (New_Reference_To (J, Loc)));
4705 Make_Implicit_Loop_Statement (N,
4706 Identifier => Empty,
4709 Make_Iteration_Scheme (Loc,
4710 Loop_Parameter_Specification =>
4711 Make_Loop_Parameter_Specification (Loc,
4712 Defining_Identifier => J,
4713 Discrete_Subtype_Definition =>
4714 Make_Attribute_Reference (Loc,
4715 Prefix => Make_Identifier (Loc, Chars (A)),
4716 Attribute_Name => Name_Range))),
4718 Statements => New_List (
4719 Make_Assignment_Statement (Loc,
4721 Expression => Make_Op_Not (Loc, A_J))));
4723 Func_Name := Make_Defining_Identifier (Loc, New_Internal_Name ('N'));
4724 Set_Is_Inlined (Func_Name);
4727 Make_Subprogram_Body (Loc,
4729 Make_Function_Specification (Loc,
4730 Defining_Unit_Name => Func_Name,
4731 Parameter_Specifications => New_List (
4732 Make_Parameter_Specification (Loc,
4733 Defining_Identifier => A,
4734 Parameter_Type => New_Reference_To (Typ, Loc))),
4735 Subtype_Mark => New_Reference_To (Typ, Loc)),
4737 Declarations => New_List (
4738 Make_Object_Declaration (Loc,
4739 Defining_Identifier => B,
4740 Object_Definition => New_Reference_To (Arr, Loc))),
4742 Handled_Statement_Sequence =>
4743 Make_Handled_Sequence_Of_Statements (Loc,
4744 Statements => New_List (
4746 Make_Return_Statement (Loc,
4748 Make_Identifier (Loc, Chars (B)))))));
4751 Make_Function_Call (Loc,
4752 Name => New_Reference_To (Func_Name, Loc),
4753 Parameter_Associations => New_List (Opnd)));
4755 Analyze_And_Resolve (N, Typ);
4756 end Expand_N_Op_Not;
4758 --------------------
4759 -- Expand_N_Op_Or --
4760 --------------------
4762 procedure Expand_N_Op_Or (N : Node_Id) is
4763 Typ : constant Entity_Id := Etype (N);
4766 Binary_Op_Validity_Checks (N);
4768 if Is_Array_Type (Etype (N)) then
4769 Expand_Boolean_Operator (N);
4771 elsif Is_Boolean_Type (Etype (N)) then
4772 Adjust_Condition (Left_Opnd (N));
4773 Adjust_Condition (Right_Opnd (N));
4774 Set_Etype (N, Standard_Boolean);
4775 Adjust_Result_Type (N, Typ);
4779 ----------------------
4780 -- Expand_N_Op_Plus --
4781 ----------------------
4783 procedure Expand_N_Op_Plus (N : Node_Id) is
4785 Unary_Op_Validity_Checks (N);
4786 end Expand_N_Op_Plus;
4788 ---------------------
4789 -- Expand_N_Op_Rem --
4790 ---------------------
4792 procedure Expand_N_Op_Rem (N : Node_Id) is
4793 Loc : constant Source_Ptr := Sloc (N);
4794 Typ : constant Entity_Id := Etype (N);
4796 Left : constant Node_Id := Left_Opnd (N);
4797 Right : constant Node_Id := Right_Opnd (N);
4808 Binary_Op_Validity_Checks (N);
4810 if Is_Integer_Type (Etype (N)) then
4811 Apply_Divide_Check (N);
4814 -- Apply optimization x rem 1 = 0. We don't really need that with
4815 -- gcc, but it is useful with other back ends (e.g. AAMP), and is
4816 -- certainly harmless.
4818 if Is_Integer_Type (Etype (N))
4819 and then Compile_Time_Known_Value (Right)
4820 and then Expr_Value (Right) = Uint_1
4822 Rewrite (N, Make_Integer_Literal (Loc, 0));
4823 Analyze_And_Resolve (N, Typ);
4827 -- Deal with annoying case of largest negative number remainder
4828 -- minus one. Gigi does not handle this case correctly, because
4829 -- it generates a divide instruction which may trap in this case.
4831 -- In fact the check is quite easy, if the right operand is -1,
4832 -- then the remainder is always 0, and we can just ignore the
4833 -- left operand completely in this case.
4835 Determine_Range (Right, ROK, Rlo, Rhi);
4836 Determine_Range (Left, LOK, Llo, Lhi);
4838 -- The operand type may be private (e.g. in the expansion of an
4839 -- an intrinsic operation) so we must use the underlying type to
4840 -- get the bounds, and convert the literals explicitly.
4844 (Type_Low_Bound (Base_Type (Underlying_Type (Etype (Left)))));
4846 -- Now perform the test, generating code only if needed
4848 if ((not ROK) or else (Rlo <= (-1) and then (-1) <= Rhi))
4850 ((not LOK) or else (Llo = LLB))
4853 Make_Conditional_Expression (Loc,
4854 Expressions => New_List (
4856 Left_Opnd => Duplicate_Subexpr (Right),
4858 Unchecked_Convert_To (Typ,
4859 Make_Integer_Literal (Loc, -1))),
4861 Unchecked_Convert_To (Typ,
4862 Make_Integer_Literal (Loc, Uint_0)),
4864 Relocate_Node (N))));
4866 Set_Analyzed (Next (Next (First (Expressions (N)))));
4867 Analyze_And_Resolve (N, Typ);
4869 end Expand_N_Op_Rem;
4871 -----------------------------
4872 -- Expand_N_Op_Rotate_Left --
4873 -----------------------------
4875 procedure Expand_N_Op_Rotate_Left (N : Node_Id) is
4877 Binary_Op_Validity_Checks (N);
4878 end Expand_N_Op_Rotate_Left;
4880 ------------------------------
4881 -- Expand_N_Op_Rotate_Right --
4882 ------------------------------
4884 procedure Expand_N_Op_Rotate_Right (N : Node_Id) is
4886 Binary_Op_Validity_Checks (N);
4887 end Expand_N_Op_Rotate_Right;
4889 ----------------------------
4890 -- Expand_N_Op_Shift_Left --
4891 ----------------------------
4893 procedure Expand_N_Op_Shift_Left (N : Node_Id) is
4895 Binary_Op_Validity_Checks (N);
4896 end Expand_N_Op_Shift_Left;
4898 -----------------------------
4899 -- Expand_N_Op_Shift_Right --
4900 -----------------------------
4902 procedure Expand_N_Op_Shift_Right (N : Node_Id) is
4904 Binary_Op_Validity_Checks (N);
4905 end Expand_N_Op_Shift_Right;
4907 ----------------------------------------
4908 -- Expand_N_Op_Shift_Right_Arithmetic --
4909 ----------------------------------------
4911 procedure Expand_N_Op_Shift_Right_Arithmetic (N : Node_Id) is
4913 Binary_Op_Validity_Checks (N);
4914 end Expand_N_Op_Shift_Right_Arithmetic;
4916 --------------------------
4917 -- Expand_N_Op_Subtract --
4918 --------------------------
4920 procedure Expand_N_Op_Subtract (N : Node_Id) is
4921 Typ : constant Entity_Id := Etype (N);
4924 Binary_Op_Validity_Checks (N);
4926 -- N - 0 = N for integer types
4928 if Is_Integer_Type (Typ)
4929 and then Compile_Time_Known_Value (Right_Opnd (N))
4930 and then Expr_Value (Right_Opnd (N)) = 0
4932 Rewrite (N, Left_Opnd (N));
4936 -- Arithemtic overflow checks for signed integer/fixed point types
4938 if Is_Signed_Integer_Type (Typ)
4939 or else Is_Fixed_Point_Type (Typ)
4941 Apply_Arithmetic_Overflow_Check (N);
4943 -- Vax floating-point types case
4945 elsif Vax_Float (Typ) then
4946 Expand_Vax_Arith (N);
4948 end Expand_N_Op_Subtract;
4950 ---------------------
4951 -- Expand_N_Op_Xor --
4952 ---------------------
4954 procedure Expand_N_Op_Xor (N : Node_Id) is
4955 Typ : constant Entity_Id := Etype (N);
4958 Binary_Op_Validity_Checks (N);
4960 if Is_Array_Type (Etype (N)) then
4961 Expand_Boolean_Operator (N);
4963 elsif Is_Boolean_Type (Etype (N)) then
4964 Adjust_Condition (Left_Opnd (N));
4965 Adjust_Condition (Right_Opnd (N));
4966 Set_Etype (N, Standard_Boolean);
4967 Adjust_Result_Type (N, Typ);
4969 end Expand_N_Op_Xor;
4971 ----------------------
4972 -- Expand_N_Or_Else --
4973 ----------------------
4975 -- Expand into conditional expression if Actions present, and also
4976 -- deal with optimizing case of arguments being True or False.
4978 procedure Expand_N_Or_Else (N : Node_Id) is
4979 Loc : constant Source_Ptr := Sloc (N);
4980 Typ : constant Entity_Id := Etype (N);
4981 Left : constant Node_Id := Left_Opnd (N);
4982 Right : constant Node_Id := Right_Opnd (N);
4986 -- Deal with non-standard booleans
4988 if Is_Boolean_Type (Typ) then
4989 Adjust_Condition (Left);
4990 Adjust_Condition (Right);
4991 Set_Etype (N, Standard_Boolean);
4994 -- Check for cases of left argument is True or False
4996 if Nkind (Left) = N_Identifier then
4998 -- If left argument is False, change (False or else Right) to Right.
4999 -- Any actions associated with Right will be executed unconditionally
5000 -- and can thus be inserted into the tree unconditionally.
5002 if Entity (Left) = Standard_False then
5003 if Present (Actions (N)) then
5004 Insert_Actions (N, Actions (N));
5008 Adjust_Result_Type (N, Typ);
5011 -- If left argument is True, change (True and then Right) to
5012 -- True. In this case we can forget the actions associated with
5013 -- Right, since they will never be executed.
5015 elsif Entity (Left) = Standard_True then
5016 Kill_Dead_Code (Right);
5017 Kill_Dead_Code (Actions (N));
5018 Rewrite (N, New_Occurrence_Of (Standard_True, Loc));
5019 Adjust_Result_Type (N, Typ);
5024 -- If Actions are present, we expand
5026 -- left or else right
5030 -- if left then True else right end
5032 -- with the actions becoming the Else_Actions of the conditional
5033 -- expression. This conditional expression is then further expanded
5034 -- (and will eventually disappear)
5036 if Present (Actions (N)) then
5037 Actlist := Actions (N);
5039 Make_Conditional_Expression (Loc,
5040 Expressions => New_List (
5042 New_Occurrence_Of (Standard_True, Loc),
5045 Set_Else_Actions (N, Actlist);
5046 Analyze_And_Resolve (N, Standard_Boolean);
5047 Adjust_Result_Type (N, Typ);
5051 -- No actions present, check for cases of right argument True/False
5053 if Nkind (Right) = N_Identifier then
5055 -- Change (Left or else False) to Left. Note that we know there
5056 -- are no actions associated with the True operand, since we
5057 -- just checked for this case above.
5059 if Entity (Right) = Standard_False then
5062 -- Change (Left or else True) to True, making sure to preserve
5063 -- any side effects associated with the Left operand.
5065 elsif Entity (Right) = Standard_True then
5066 Remove_Side_Effects (Left);
5068 (N, New_Occurrence_Of (Standard_True, Loc));
5072 Adjust_Result_Type (N, Typ);
5073 end Expand_N_Or_Else;
5075 -----------------------------------
5076 -- Expand_N_Qualified_Expression --
5077 -----------------------------------
5079 procedure Expand_N_Qualified_Expression (N : Node_Id) is
5080 Operand : constant Node_Id := Expression (N);
5081 Target_Type : constant Entity_Id := Entity (Subtype_Mark (N));
5084 Apply_Constraint_Check (Operand, Target_Type, No_Sliding => True);
5085 end Expand_N_Qualified_Expression;
5087 ---------------------------------
5088 -- Expand_N_Selected_Component --
5089 ---------------------------------
5091 -- If the selector is a discriminant of a concurrent object, rewrite the
5092 -- prefix to denote the corresponding record type.
5094 procedure Expand_N_Selected_Component (N : Node_Id) is
5095 Loc : constant Source_Ptr := Sloc (N);
5096 Par : constant Node_Id := Parent (N);
5097 P : constant Node_Id := Prefix (N);
5098 Ptyp : Entity_Id := Underlying_Type (Etype (P));
5103 function In_Left_Hand_Side (Comp : Node_Id) return Boolean;
5104 -- Gigi needs a temporary for prefixes that depend on a discriminant,
5105 -- unless the context of an assignment can provide size information.
5106 -- Don't we have a general routine that does this???
5108 -----------------------
5109 -- In_Left_Hand_Side --
5110 -----------------------
5112 function In_Left_Hand_Side (Comp : Node_Id) return Boolean is
5114 return (Nkind (Parent (Comp)) = N_Assignment_Statement
5115 and then Comp = Name (Parent (Comp)))
5116 or else (Present (Parent (Comp))
5117 and then Nkind (Parent (Comp)) in N_Subexpr
5118 and then In_Left_Hand_Side (Parent (Comp)));
5119 end In_Left_Hand_Side;
5121 -- Start of processing for Expand_N_Selected_Component
5124 -- Insert explicit dereference if required
5126 if Is_Access_Type (Ptyp) then
5127 Insert_Explicit_Dereference (P);
5129 if Ekind (Etype (P)) = E_Private_Subtype
5130 and then Is_For_Access_Subtype (Etype (P))
5132 Set_Etype (P, Base_Type (Etype (P)));
5138 -- Deal with discriminant check required
5140 if Do_Discriminant_Check (N) then
5142 -- Present the discrminant checking function to the backend,
5143 -- so that it can inline the call to the function.
5146 (Discriminant_Checking_Func
5147 (Original_Record_Component (Entity (Selector_Name (N)))));
5149 -- Now reset the flag and generate the call
5151 Set_Do_Discriminant_Check (N, False);
5152 Generate_Discriminant_Check (N);
5155 -- Gigi cannot handle unchecked conversions that are the prefix of a
5156 -- selected component with discriminants. This must be checked during
5157 -- expansion, because during analysis the type of the selector is not
5158 -- known at the point the prefix is analyzed. If the conversion is the
5159 -- target of an assignment, then we cannot force the evaluation.
5161 if Nkind (Prefix (N)) = N_Unchecked_Type_Conversion
5162 and then Has_Discriminants (Etype (N))
5163 and then not In_Left_Hand_Side (N)
5165 Force_Evaluation (Prefix (N));
5168 -- Remaining processing applies only if selector is a discriminant
5170 if Ekind (Entity (Selector_Name (N))) = E_Discriminant then
5172 -- If the selector is a discriminant of a constrained record type,
5173 -- we may be able to rewrite the expression with the actual value
5174 -- of the discriminant, a useful optimization in some cases.
5176 if Is_Record_Type (Ptyp)
5177 and then Has_Discriminants (Ptyp)
5178 and then Is_Constrained (Ptyp)
5180 -- Do this optimization for discrete types only, and not for
5181 -- access types (access discriminants get us into trouble!)
5183 if not Is_Discrete_Type (Etype (N)) then
5186 -- Don't do this on the left hand of an assignment statement.
5187 -- Normally one would think that references like this would
5188 -- not occur, but they do in generated code, and mean that
5189 -- we really do want to assign the discriminant!
5191 elsif Nkind (Par) = N_Assignment_Statement
5192 and then Name (Par) = N
5196 -- Don't do this optimization for the prefix of an attribute
5197 -- or the operand of an object renaming declaration since these
5198 -- are contexts where we do not want the value anyway.
5200 elsif (Nkind (Par) = N_Attribute_Reference
5201 and then Prefix (Par) = N)
5202 or else Is_Renamed_Object (N)
5206 -- Don't do this optimization if we are within the code for a
5207 -- discriminant check, since the whole point of such a check may
5208 -- be to verify the condition on which the code below depends!
5210 elsif Is_In_Discriminant_Check (N) then
5213 -- Green light to see if we can do the optimization. There is
5214 -- still one condition that inhibits the optimization below
5215 -- but now is the time to check the particular discriminant.
5218 -- Loop through discriminants to find the matching
5219 -- discriminant constraint to see if we can copy it.
5221 Disc := First_Discriminant (Ptyp);
5222 Dcon := First_Elmt (Discriminant_Constraint (Ptyp));
5223 Discr_Loop : while Present (Dcon) loop
5225 -- Check if this is the matching discriminant
5227 if Disc = Entity (Selector_Name (N)) then
5229 -- Here we have the matching discriminant. Check for
5230 -- the case of a discriminant of a component that is
5231 -- constrained by an outer discriminant, which cannot
5232 -- be optimized away.
5235 Denotes_Discriminant
5236 (Node (Dcon), Check_Protected => True)
5240 -- In the context of a case statement, the expression
5241 -- may have the base type of the discriminant, and we
5242 -- need to preserve the constraint to avoid spurious
5243 -- errors on missing cases.
5245 elsif Nkind (Parent (N)) = N_Case_Statement
5246 and then Etype (Node (Dcon)) /= Etype (Disc)
5248 -- RBKD is suspicious of the following code. The
5249 -- call to New_Copy instead of New_Copy_Tree is
5250 -- suspicious, and the call to Analyze instead
5251 -- of Analyze_And_Resolve is also suspicious ???
5253 -- Wouldn't it be good enough to do a perfectly
5254 -- normal Analyze_And_Resolve call using the
5255 -- subtype of the discriminant here???
5258 Make_Qualified_Expression (Loc,
5260 New_Occurrence_Of (Etype (Disc), Loc),
5262 New_Copy (Node (Dcon))));
5265 -- In case that comes out as a static expression,
5266 -- reset it (a selected component is never static).
5268 Set_Is_Static_Expression (N, False);
5271 -- Otherwise we can just copy the constraint, but the
5272 -- result is certainly not static!
5274 -- Again the New_Copy here and the failure to even
5275 -- to an analyze call is uneasy ???
5278 Rewrite (N, New_Copy (Node (Dcon)));
5279 Set_Is_Static_Expression (N, False);
5285 Next_Discriminant (Disc);
5286 end loop Discr_Loop;
5288 -- Note: the above loop should always find a matching
5289 -- discriminant, but if it does not, we just missed an
5290 -- optimization due to some glitch (perhaps a previous
5291 -- error), so ignore.
5296 -- The only remaining processing is in the case of a discriminant of
5297 -- a concurrent object, where we rewrite the prefix to denote the
5298 -- corresponding record type. If the type is derived and has renamed
5299 -- discriminants, use corresponding discriminant, which is the one
5300 -- that appears in the corresponding record.
5302 if not Is_Concurrent_Type (Ptyp) then
5306 Disc := Entity (Selector_Name (N));
5308 if Is_Derived_Type (Ptyp)
5309 and then Present (Corresponding_Discriminant (Disc))
5311 Disc := Corresponding_Discriminant (Disc);
5315 Make_Selected_Component (Loc,
5317 Unchecked_Convert_To (Corresponding_Record_Type (Ptyp),
5319 Selector_Name => Make_Identifier (Loc, Chars (Disc)));
5324 end Expand_N_Selected_Component;
5326 --------------------
5327 -- Expand_N_Slice --
5328 --------------------
5330 procedure Expand_N_Slice (N : Node_Id) is
5331 Loc : constant Source_Ptr := Sloc (N);
5332 Typ : constant Entity_Id := Etype (N);
5333 Pfx : constant Node_Id := Prefix (N);
5334 Ptp : Entity_Id := Etype (Pfx);
5336 function Is_Procedure_Actual (N : Node_Id) return Boolean;
5337 -- Check whether context is a procedure call, in which case
5338 -- expansion of a bit-packed slice is deferred until the call
5339 -- itself is expanded.
5341 procedure Make_Temporary;
5342 -- Create a named variable for the value of the slice, in
5343 -- cases where the back-end cannot handle it properly, e.g.
5344 -- when packed types or unaligned slices are involved.
5346 -------------------------
5347 -- Is_Procedure_Actual --
5348 -------------------------
5350 function Is_Procedure_Actual (N : Node_Id) return Boolean is
5351 Par : Node_Id := Parent (N);
5354 and then Nkind (Par) not in N_Statement_Other_Than_Procedure_Call
5356 if Nkind (Par) = N_Procedure_Call_Statement then
5359 Par := Parent (Par);
5364 end Is_Procedure_Actual;
5366 --------------------
5367 -- Make_Temporary --
5368 --------------------
5370 procedure Make_Temporary is
5372 Ent : constant Entity_Id :=
5373 Make_Defining_Identifier (Loc, New_Internal_Name ('T'));
5376 Make_Object_Declaration (Loc,
5377 Defining_Identifier => Ent,
5378 Object_Definition => New_Occurrence_Of (Typ, Loc));
5380 Set_No_Initialization (Decl);
5382 Insert_Actions (N, New_List (
5384 Make_Assignment_Statement (Loc,
5385 Name => New_Occurrence_Of (Ent, Loc),
5386 Expression => Relocate_Node (N))));
5388 Rewrite (N, New_Occurrence_Of (Ent, Loc));
5389 Analyze_And_Resolve (N, Typ);
5392 -- Start of processing for Expand_N_Slice
5395 -- Special handling for access types
5397 if Is_Access_Type (Ptp) then
5399 -- Check for explicit dereference required for checked pool
5401 Insert_Dereference_Action (Pfx);
5403 -- If we have an access to a packed array type, then put in an
5404 -- explicit dereference. We do this in case the slice must be
5405 -- expanded, and we want to make sure we get an access check.
5407 Ptp := Designated_Type (Ptp);
5409 if Is_Array_Type (Ptp) and then Is_Packed (Ptp) then
5411 Make_Explicit_Dereference (Sloc (N),
5412 Prefix => Relocate_Node (Pfx)));
5414 Analyze_And_Resolve (Pfx, Ptp);
5418 -- Range checks are potentially also needed for cases involving
5419 -- a slice indexed by a subtype indication, but Do_Range_Check
5420 -- can currently only be set for expressions ???
5422 if not Index_Checks_Suppressed (Ptp)
5423 and then (not Is_Entity_Name (Pfx)
5424 or else not Index_Checks_Suppressed (Entity (Pfx)))
5425 and then Nkind (Discrete_Range (N)) /= N_Subtype_Indication
5427 Enable_Range_Check (Discrete_Range (N));
5430 -- The remaining case to be handled is packed slices. We can leave
5431 -- packed slices as they are in the following situations:
5433 -- 1. Right or left side of an assignment (we can handle this
5434 -- situation correctly in the assignment statement expansion).
5436 -- 2. Prefix of indexed component (the slide is optimized away
5437 -- in this case, see the start of Expand_N_Slice.
5439 -- 3. Object renaming declaration, since we want the name of
5440 -- the slice, not the value.
5442 -- 4. Argument to procedure call, since copy-in/copy-out handling
5443 -- may be required, and this is handled in the expansion of
5446 -- 5. Prefix of an address attribute (this is an error which
5447 -- is caught elsewhere, and the expansion would intefere
5448 -- with generating the error message).
5450 if not Is_Packed (Typ) then
5451 -- apply transformation for actuals of a function call, where
5452 -- Expand_Actuals is not used.
5454 if Nkind (Parent (N)) = N_Function_Call
5455 and then Is_Possibly_Unaligned_Slice (N)
5460 elsif Nkind (Parent (N)) = N_Assignment_Statement
5461 or else (Nkind (Parent (Parent (N))) = N_Assignment_Statement
5462 and then Parent (N) = Name (Parent (Parent (N))))
5466 elsif Nkind (Parent (N)) = N_Indexed_Component
5467 or else Is_Renamed_Object (N)
5468 or else Is_Procedure_Actual (N)
5472 elsif (Nkind (Parent (N)) = N_Attribute_Reference
5473 and then Attribute_Name (Parent (N)) = Name_Address)
5482 ------------------------------
5483 -- Expand_N_Type_Conversion --
5484 ------------------------------
5486 procedure Expand_N_Type_Conversion (N : Node_Id) is
5487 Loc : constant Source_Ptr := Sloc (N);
5488 Operand : constant Node_Id := Expression (N);
5489 Target_Type : constant Entity_Id := Etype (N);
5490 Operand_Type : Entity_Id := Etype (Operand);
5492 procedure Handle_Changed_Representation;
5493 -- This is called in the case of record and array type conversions
5494 -- to see if there is a change of representation to be handled.
5495 -- Change of representation is actually handled at the assignment
5496 -- statement level, and what this procedure does is rewrite node N
5497 -- conversion as an assignment to temporary. If there is no change
5498 -- of representation, then the conversion node is unchanged.
5500 procedure Real_Range_Check;
5501 -- Handles generation of range check for real target value
5503 -----------------------------------
5504 -- Handle_Changed_Representation --
5505 -----------------------------------
5507 procedure Handle_Changed_Representation is
5516 -- Nothing to do if no change of representation
5518 if Same_Representation (Operand_Type, Target_Type) then
5521 -- The real change of representation work is done by the assignment
5522 -- statement processing. So if this type conversion is appearing as
5523 -- the expression of an assignment statement, nothing needs to be
5524 -- done to the conversion.
5526 elsif Nkind (Parent (N)) = N_Assignment_Statement then
5529 -- Otherwise we need to generate a temporary variable, and do the
5530 -- change of representation assignment into that temporary variable.
5531 -- The conversion is then replaced by a reference to this variable.
5536 -- If type is unconstrained we have to add a constraint,
5537 -- copied from the actual value of the left hand side.
5539 if not Is_Constrained (Target_Type) then
5540 if Has_Discriminants (Operand_Type) then
5541 Disc := First_Discriminant (Operand_Type);
5543 if Disc /= First_Stored_Discriminant (Operand_Type) then
5544 Disc := First_Stored_Discriminant (Operand_Type);
5548 while Present (Disc) loop
5550 Make_Selected_Component (Loc,
5551 Prefix => Duplicate_Subexpr_Move_Checks (Operand),
5553 Make_Identifier (Loc, Chars (Disc))));
5554 Next_Discriminant (Disc);
5557 elsif Is_Array_Type (Operand_Type) then
5558 N_Ix := First_Index (Target_Type);
5561 for J in 1 .. Number_Dimensions (Operand_Type) loop
5563 -- We convert the bounds explicitly. We use an unchecked
5564 -- conversion because bounds checks are done elsewhere.
5569 Unchecked_Convert_To (Etype (N_Ix),
5570 Make_Attribute_Reference (Loc,
5572 Duplicate_Subexpr_No_Checks
5573 (Operand, Name_Req => True),
5574 Attribute_Name => Name_First,
5575 Expressions => New_List (
5576 Make_Integer_Literal (Loc, J)))),
5579 Unchecked_Convert_To (Etype (N_Ix),
5580 Make_Attribute_Reference (Loc,
5582 Duplicate_Subexpr_No_Checks
5583 (Operand, Name_Req => True),
5584 Attribute_Name => Name_Last,
5585 Expressions => New_List (
5586 Make_Integer_Literal (Loc, J))))));
5593 Odef := New_Occurrence_Of (Target_Type, Loc);
5595 if Present (Cons) then
5597 Make_Subtype_Indication (Loc,
5598 Subtype_Mark => Odef,
5600 Make_Index_Or_Discriminant_Constraint (Loc,
5601 Constraints => Cons));
5604 Temp := Make_Defining_Identifier (Loc, New_Internal_Name ('C'));
5606 Make_Object_Declaration (Loc,
5607 Defining_Identifier => Temp,
5608 Object_Definition => Odef);
5610 Set_No_Initialization (Decl, True);
5612 -- Insert required actions. It is essential to suppress checks
5613 -- since we have suppressed default initialization, which means
5614 -- that the variable we create may have no discriminants.
5619 Make_Assignment_Statement (Loc,
5620 Name => New_Occurrence_Of (Temp, Loc),
5621 Expression => Relocate_Node (N))),
5622 Suppress => All_Checks);
5624 Rewrite (N, New_Occurrence_Of (Temp, Loc));
5627 end Handle_Changed_Representation;
5629 ----------------------
5630 -- Real_Range_Check --
5631 ----------------------
5633 -- Case of conversions to floating-point or fixed-point. If range
5634 -- checks are enabled and the target type has a range constraint,
5641 -- Tnn : typ'Base := typ'Base (x);
5642 -- [constraint_error when Tnn < typ'First or else Tnn > typ'Last]
5645 -- This is necessary when there is a conversion of integer to float
5646 -- or to fixed-point to ensure that the correct checks are made. It
5647 -- is not necessary for float to float where it is enough to simply
5648 -- set the Do_Range_Check flag.
5650 procedure Real_Range_Check is
5651 Btyp : constant Entity_Id := Base_Type (Target_Type);
5652 Lo : constant Node_Id := Type_Low_Bound (Target_Type);
5653 Hi : constant Node_Id := Type_High_Bound (Target_Type);
5654 Xtyp : constant Entity_Id := Etype (Operand);
5659 -- Nothing to do if conversion was rewritten
5661 if Nkind (N) /= N_Type_Conversion then
5665 -- Nothing to do if range checks suppressed, or target has the
5666 -- same range as the base type (or is the base type).
5668 if Range_Checks_Suppressed (Target_Type)
5669 or else (Lo = Type_Low_Bound (Btyp)
5671 Hi = Type_High_Bound (Btyp))
5676 -- Nothing to do if expression is an entity on which checks
5677 -- have been suppressed.
5679 if Is_Entity_Name (Operand)
5680 and then Range_Checks_Suppressed (Entity (Operand))
5685 -- Nothing to do if bounds are all static and we can tell that
5686 -- the expression is within the bounds of the target. Note that
5687 -- if the operand is of an unconstrained floating-point type,
5688 -- then we do not trust it to be in range (might be infinite)
5691 S_Lo : constant Node_Id := Type_Low_Bound (Xtyp);
5692 S_Hi : constant Node_Id := Type_High_Bound (Xtyp);
5695 if (not Is_Floating_Point_Type (Xtyp)
5696 or else Is_Constrained (Xtyp))
5697 and then Compile_Time_Known_Value (S_Lo)
5698 and then Compile_Time_Known_Value (S_Hi)
5699 and then Compile_Time_Known_Value (Hi)
5700 and then Compile_Time_Known_Value (Lo)
5703 D_Lov : constant Ureal := Expr_Value_R (Lo);
5704 D_Hiv : constant Ureal := Expr_Value_R (Hi);
5709 if Is_Real_Type (Xtyp) then
5710 S_Lov := Expr_Value_R (S_Lo);
5711 S_Hiv := Expr_Value_R (S_Hi);
5713 S_Lov := UR_From_Uint (Expr_Value (S_Lo));
5714 S_Hiv := UR_From_Uint (Expr_Value (S_Hi));
5718 and then S_Lov >= D_Lov
5719 and then S_Hiv <= D_Hiv
5721 Set_Do_Range_Check (Operand, False);
5728 -- For float to float conversions, we are done
5730 if Is_Floating_Point_Type (Xtyp)
5732 Is_Floating_Point_Type (Btyp)
5737 -- Otherwise rewrite the conversion as described above
5739 Conv := Relocate_Node (N);
5741 (Subtype_Mark (Conv), New_Occurrence_Of (Btyp, Loc));
5742 Set_Etype (Conv, Btyp);
5744 -- Enable overflow except in the case of integer to float
5745 -- conversions, where it is never required, since we can
5746 -- never have overflow in this case.
5748 if not Is_Integer_Type (Etype (Operand)) then
5749 Enable_Overflow_Check (Conv);
5753 Make_Defining_Identifier (Loc,
5754 Chars => New_Internal_Name ('T'));
5756 Insert_Actions (N, New_List (
5757 Make_Object_Declaration (Loc,
5758 Defining_Identifier => Tnn,
5759 Object_Definition => New_Occurrence_Of (Btyp, Loc),
5760 Expression => Conv),
5762 Make_Raise_Constraint_Error (Loc,
5767 Left_Opnd => New_Occurrence_Of (Tnn, Loc),
5769 Make_Attribute_Reference (Loc,
5770 Attribute_Name => Name_First,
5772 New_Occurrence_Of (Target_Type, Loc))),
5776 Left_Opnd => New_Occurrence_Of (Tnn, Loc),
5778 Make_Attribute_Reference (Loc,
5779 Attribute_Name => Name_Last,
5781 New_Occurrence_Of (Target_Type, Loc)))),
5782 Reason => CE_Range_Check_Failed)));
5784 Rewrite (N, New_Occurrence_Of (Tnn, Loc));
5785 Analyze_And_Resolve (N, Btyp);
5786 end Real_Range_Check;
5788 -- Start of processing for Expand_N_Type_Conversion
5791 -- Nothing at all to do if conversion is to the identical type
5792 -- so remove the conversion completely, it is useless.
5794 if Operand_Type = Target_Type then
5795 Rewrite (N, Relocate_Node (Operand));
5799 -- Deal with Vax floating-point cases
5801 if Vax_Float (Operand_Type) or else Vax_Float (Target_Type) then
5802 Expand_Vax_Conversion (N);
5806 -- Nothing to do if this is the second argument of read. This
5807 -- is a "backwards" conversion that will be handled by the
5808 -- specialized code in attribute processing.
5810 if Nkind (Parent (N)) = N_Attribute_Reference
5811 and then Attribute_Name (Parent (N)) = Name_Read
5812 and then Next (First (Expressions (Parent (N)))) = N
5817 -- Here if we may need to expand conversion
5819 -- Special case of converting from non-standard boolean type
5821 if Is_Boolean_Type (Operand_Type)
5822 and then (Nonzero_Is_True (Operand_Type))
5824 Adjust_Condition (Operand);
5825 Set_Etype (Operand, Standard_Boolean);
5826 Operand_Type := Standard_Boolean;
5829 -- Case of converting to an access type
5831 if Is_Access_Type (Target_Type) then
5833 -- Apply an accessibility check if the operand is an
5834 -- access parameter. Note that other checks may still
5835 -- need to be applied below (such as tagged type checks).
5837 if Is_Entity_Name (Operand)
5838 and then Ekind (Entity (Operand)) in Formal_Kind
5839 and then Ekind (Etype (Operand)) = E_Anonymous_Access_Type
5841 Apply_Accessibility_Check (Operand, Target_Type);
5843 -- If the level of the operand type is statically deeper
5844 -- then the level of the target type, then force Program_Error.
5845 -- Note that this can only occur for cases where the attribute
5846 -- is within the body of an instantiation (otherwise the
5847 -- conversion will already have been rejected as illegal).
5848 -- Note: warnings are issued by the analyzer for the instance
5851 elsif In_Instance_Body
5852 and then Type_Access_Level (Operand_Type) >
5853 Type_Access_Level (Target_Type)
5856 Make_Raise_Program_Error (Sloc (N),
5857 Reason => PE_Accessibility_Check_Failed));
5858 Set_Etype (N, Target_Type);
5860 -- When the operand is a selected access discriminant
5861 -- the check needs to be made against the level of the
5862 -- object denoted by the prefix of the selected name.
5863 -- Force Program_Error for this case as well (this
5864 -- accessibility violation can only happen if within
5865 -- the body of an instantiation).
5867 elsif In_Instance_Body
5868 and then Ekind (Operand_Type) = E_Anonymous_Access_Type
5869 and then Nkind (Operand) = N_Selected_Component
5870 and then Object_Access_Level (Operand) >
5871 Type_Access_Level (Target_Type)
5874 Make_Raise_Program_Error (Sloc (N),
5875 Reason => PE_Accessibility_Check_Failed));
5876 Set_Etype (N, Target_Type);
5880 -- Case of conversions of tagged types and access to tagged types
5882 -- When needed, that is to say when the expression is class-wide,
5883 -- Add runtime a tag check for (strict) downward conversion by using
5884 -- the membership test, generating:
5886 -- [constraint_error when Operand not in Target_Type'Class]
5888 -- or in the access type case
5890 -- [constraint_error
5891 -- when Operand /= null
5892 -- and then Operand.all not in
5893 -- Designated_Type (Target_Type)'Class]
5895 if (Is_Access_Type (Target_Type)
5896 and then Is_Tagged_Type (Designated_Type (Target_Type)))
5897 or else Is_Tagged_Type (Target_Type)
5899 -- Do not do any expansion in the access type case if the
5900 -- parent is a renaming, since this is an error situation
5901 -- which will be caught by Sem_Ch8, and the expansion can
5902 -- intefere with this error check.
5904 if Is_Access_Type (Target_Type)
5905 and then Is_Renamed_Object (N)
5910 -- Oherwise, proceed with processing tagged conversion
5913 Actual_Operand_Type : Entity_Id;
5914 Actual_Target_Type : Entity_Id;
5919 if Is_Access_Type (Target_Type) then
5920 Actual_Operand_Type := Designated_Type (Operand_Type);
5921 Actual_Target_Type := Designated_Type (Target_Type);
5924 Actual_Operand_Type := Operand_Type;
5925 Actual_Target_Type := Target_Type;
5928 if Is_Class_Wide_Type (Actual_Operand_Type)
5929 and then Root_Type (Actual_Operand_Type) /= Actual_Target_Type
5930 and then Is_Ancestor
5931 (Root_Type (Actual_Operand_Type),
5933 and then not Tag_Checks_Suppressed (Actual_Target_Type)
5935 -- The conversion is valid for any descendant of the
5938 Actual_Target_Type := Class_Wide_Type (Actual_Target_Type);
5940 if Is_Access_Type (Target_Type) then
5945 Left_Opnd => Duplicate_Subexpr_No_Checks (Operand),
5946 Right_Opnd => Make_Null (Loc)),
5951 Make_Explicit_Dereference (Loc,
5953 Duplicate_Subexpr_No_Checks (Operand)),
5955 New_Reference_To (Actual_Target_Type, Loc)));
5960 Left_Opnd => Duplicate_Subexpr_No_Checks (Operand),
5962 New_Reference_To (Actual_Target_Type, Loc));
5966 Make_Raise_Constraint_Error (Loc,
5968 Reason => CE_Tag_Check_Failed));
5970 Change_Conversion_To_Unchecked (N);
5971 Analyze_And_Resolve (N, Target_Type);
5975 -- Case of other access type conversions
5977 elsif Is_Access_Type (Target_Type) then
5978 Apply_Constraint_Check (Operand, Target_Type);
5980 -- Case of conversions from a fixed-point type
5982 -- These conversions require special expansion and processing, found
5983 -- in the Exp_Fixd package. We ignore cases where Conversion_OK is
5984 -- set, since from a semantic point of view, these are simple integer
5985 -- conversions, which do not need further processing.
5987 elsif Is_Fixed_Point_Type (Operand_Type)
5988 and then not Conversion_OK (N)
5990 -- We should never see universal fixed at this case, since the
5991 -- expansion of the constituent divide or multiply should have
5992 -- eliminated the explicit mention of universal fixed.
5994 pragma Assert (Operand_Type /= Universal_Fixed);
5996 -- Check for special case of the conversion to universal real
5997 -- that occurs as a result of the use of a round attribute.
5998 -- In this case, the real type for the conversion is taken
5999 -- from the target type of the Round attribute and the
6000 -- result must be marked as rounded.
6002 if Target_Type = Universal_Real
6003 and then Nkind (Parent (N)) = N_Attribute_Reference
6004 and then Attribute_Name (Parent (N)) = Name_Round
6006 Set_Rounded_Result (N);
6007 Set_Etype (N, Etype (Parent (N)));
6010 -- Otherwise do correct fixed-conversion, but skip these if the
6011 -- Conversion_OK flag is set, because from a semantic point of
6012 -- view these are simple integer conversions needing no further
6013 -- processing (the backend will simply treat them as integers)
6015 if not Conversion_OK (N) then
6016 if Is_Fixed_Point_Type (Etype (N)) then
6017 Expand_Convert_Fixed_To_Fixed (N);
6020 elsif Is_Integer_Type (Etype (N)) then
6021 Expand_Convert_Fixed_To_Integer (N);
6024 pragma Assert (Is_Floating_Point_Type (Etype (N)));
6025 Expand_Convert_Fixed_To_Float (N);
6030 -- Case of conversions to a fixed-point type
6032 -- These conversions require special expansion and processing, found
6033 -- in the Exp_Fixd package. Again, ignore cases where Conversion_OK
6034 -- is set, since from a semantic point of view, these are simple
6035 -- integer conversions, which do not need further processing.
6037 elsif Is_Fixed_Point_Type (Target_Type)
6038 and then not Conversion_OK (N)
6040 if Is_Integer_Type (Operand_Type) then
6041 Expand_Convert_Integer_To_Fixed (N);
6044 pragma Assert (Is_Floating_Point_Type (Operand_Type));
6045 Expand_Convert_Float_To_Fixed (N);
6049 -- Case of float-to-integer conversions
6051 -- We also handle float-to-fixed conversions with Conversion_OK set
6052 -- since semantically the fixed-point target is treated as though it
6053 -- were an integer in such cases.
6055 elsif Is_Floating_Point_Type (Operand_Type)
6057 (Is_Integer_Type (Target_Type)
6059 (Is_Fixed_Point_Type (Target_Type) and then Conversion_OK (N)))
6061 -- Special processing required if the conversion is the expression
6062 -- of a Truncation attribute reference. In this case we replace:
6064 -- ityp (ftyp'Truncation (x))
6070 -- with the Float_Truncate flag set. This is clearly more efficient.
6072 if Nkind (Operand) = N_Attribute_Reference
6073 and then Attribute_Name (Operand) = Name_Truncation
6076 Relocate_Node (First (Expressions (Operand))));
6077 Set_Float_Truncate (N, True);
6080 -- One more check here, gcc is still not able to do conversions of
6081 -- this type with proper overflow checking, and so gigi is doing an
6082 -- approximation of what is required by doing floating-point compares
6083 -- with the end-point. But that can lose precision in some cases, and
6084 -- give a wrong result. Converting the operand to Long_Long_Float is
6085 -- helpful, but still does not catch all cases with 64-bit integers
6086 -- on targets with only 64-bit floats ???
6088 if Do_Range_Check (Operand) then
6090 Make_Type_Conversion (Loc,
6092 New_Occurrence_Of (Standard_Long_Long_Float, Loc),
6094 Relocate_Node (Operand)));
6096 Set_Etype (Operand, Standard_Long_Long_Float);
6097 Enable_Range_Check (Operand);
6098 Set_Do_Range_Check (Expression (Operand), False);
6101 -- Case of array conversions
6103 -- Expansion of array conversions, add required length/range checks
6104 -- but only do this if there is no change of representation. For
6105 -- handling of this case, see Handle_Changed_Representation.
6107 elsif Is_Array_Type (Target_Type) then
6109 if Is_Constrained (Target_Type) then
6110 Apply_Length_Check (Operand, Target_Type);
6112 Apply_Range_Check (Operand, Target_Type);
6115 Handle_Changed_Representation;
6117 -- Case of conversions of discriminated types
6119 -- Add required discriminant checks if target is constrained. Again
6120 -- this change is skipped if we have a change of representation.
6122 elsif Has_Discriminants (Target_Type)
6123 and then Is_Constrained (Target_Type)
6125 Apply_Discriminant_Check (Operand, Target_Type);
6126 Handle_Changed_Representation;
6128 -- Case of all other record conversions. The only processing required
6129 -- is to check for a change of representation requiring the special
6130 -- assignment processing.
6132 elsif Is_Record_Type (Target_Type) then
6133 Handle_Changed_Representation;
6135 -- Case of conversions of enumeration types
6137 elsif Is_Enumeration_Type (Target_Type) then
6139 -- Special processing is required if there is a change of
6140 -- representation (from enumeration representation clauses)
6142 if not Same_Representation (Target_Type, Operand_Type) then
6144 -- Convert: x(y) to x'val (ytyp'val (y))
6147 Make_Attribute_Reference (Loc,
6148 Prefix => New_Occurrence_Of (Target_Type, Loc),
6149 Attribute_Name => Name_Val,
6150 Expressions => New_List (
6151 Make_Attribute_Reference (Loc,
6152 Prefix => New_Occurrence_Of (Operand_Type, Loc),
6153 Attribute_Name => Name_Pos,
6154 Expressions => New_List (Operand)))));
6156 Analyze_And_Resolve (N, Target_Type);
6159 -- Case of conversions to floating-point
6161 elsif Is_Floating_Point_Type (Target_Type) then
6164 -- The remaining cases require no front end processing
6170 -- At this stage, either the conversion node has been transformed
6171 -- into some other equivalent expression, or left as a conversion
6172 -- that can be handled by Gigi. The conversions that Gigi can handle
6173 -- are the following:
6175 -- Conversions with no change of representation or type
6177 -- Numeric conversions involving integer values, floating-point
6178 -- values, and fixed-point values. Fixed-point values are allowed
6179 -- only if Conversion_OK is set, i.e. if the fixed-point values
6180 -- are to be treated as integers.
6182 -- No other conversions should be passed to Gigi.
6184 -- The only remaining step is to generate a range check if we still
6185 -- have a type conversion at this stage and Do_Range_Check is set.
6186 -- For now we do this only for conversions of discrete types.
6188 if Nkind (N) = N_Type_Conversion
6189 and then Is_Discrete_Type (Etype (N))
6192 Expr : constant Node_Id := Expression (N);
6197 if Do_Range_Check (Expr)
6198 and then Is_Discrete_Type (Etype (Expr))
6200 Set_Do_Range_Check (Expr, False);
6202 -- Before we do a range check, we have to deal with treating
6203 -- a fixed-point operand as an integer. The way we do this
6204 -- is simply to do an unchecked conversion to an appropriate
6205 -- integer type large enough to hold the result.
6207 -- This code is not active yet, because we are only dealing
6208 -- with discrete types so far ???
6210 if Nkind (Expr) in N_Has_Treat_Fixed_As_Integer
6211 and then Treat_Fixed_As_Integer (Expr)
6213 Ftyp := Base_Type (Etype (Expr));
6215 if Esize (Ftyp) >= Esize (Standard_Integer) then
6216 Ityp := Standard_Long_Long_Integer;
6218 Ityp := Standard_Integer;
6221 Rewrite (Expr, Unchecked_Convert_To (Ityp, Expr));
6224 -- Reset overflow flag, since the range check will include
6225 -- dealing with possible overflow, and generate the check
6227 Set_Do_Overflow_Check (N, False);
6228 Generate_Range_Check
6229 (Expr, Target_Type, CE_Range_Check_Failed);
6233 end Expand_N_Type_Conversion;
6235 -----------------------------------
6236 -- Expand_N_Unchecked_Expression --
6237 -----------------------------------
6239 -- Remove the unchecked expression node from the tree. It's job was simply
6240 -- to make sure that its constituent expression was handled with checks
6241 -- off, and now that that is done, we can remove it from the tree, and
6242 -- indeed must, since gigi does not expect to see these nodes.
6244 procedure Expand_N_Unchecked_Expression (N : Node_Id) is
6245 Exp : constant Node_Id := Expression (N);
6248 Set_Assignment_OK (Exp, Assignment_OK (N) or Assignment_OK (Exp));
6250 end Expand_N_Unchecked_Expression;
6252 ----------------------------------------
6253 -- Expand_N_Unchecked_Type_Conversion --
6254 ----------------------------------------
6256 -- If this cannot be handled by Gigi and we haven't already made
6257 -- a temporary for it, do it now.
6259 procedure Expand_N_Unchecked_Type_Conversion (N : Node_Id) is
6260 Target_Type : constant Entity_Id := Etype (N);
6261 Operand : constant Node_Id := Expression (N);
6262 Operand_Type : constant Entity_Id := Etype (Operand);
6265 -- If we have a conversion of a compile time known value to a target
6266 -- type and the value is in range of the target type, then we can simply
6267 -- replace the construct by an integer literal of the correct type. We
6268 -- only apply this to integer types being converted. Possibly it may
6269 -- apply in other cases, but it is too much trouble to worry about.
6271 -- Note that we do not do this transformation if the Kill_Range_Check
6272 -- flag is set, since then the value may be outside the expected range.
6273 -- This happens in the Normalize_Scalars case.
6275 if Is_Integer_Type (Target_Type)
6276 and then Is_Integer_Type (Operand_Type)
6277 and then Compile_Time_Known_Value (Operand)
6278 and then not Kill_Range_Check (N)
6281 Val : constant Uint := Expr_Value (Operand);
6284 if Compile_Time_Known_Value (Type_Low_Bound (Target_Type))
6286 Compile_Time_Known_Value (Type_High_Bound (Target_Type))
6288 Val >= Expr_Value (Type_Low_Bound (Target_Type))
6290 Val <= Expr_Value (Type_High_Bound (Target_Type))
6292 Rewrite (N, Make_Integer_Literal (Sloc (N), Val));
6293 Analyze_And_Resolve (N, Target_Type);
6299 -- Nothing to do if conversion is safe
6301 if Safe_Unchecked_Type_Conversion (N) then
6305 -- Otherwise force evaluation unless Assignment_OK flag is set (this
6306 -- flag indicates ??? -- more comments needed here)
6308 if Assignment_OK (N) then
6311 Force_Evaluation (N);
6313 end Expand_N_Unchecked_Type_Conversion;
6315 ----------------------------
6316 -- Expand_Record_Equality --
6317 ----------------------------
6319 -- For non-variant records, Equality is expanded when needed into:
6321 -- and then Lhs.Discr1 = Rhs.Discr1
6323 -- and then Lhs.Discrn = Rhs.Discrn
6324 -- and then Lhs.Cmp1 = Rhs.Cmp1
6326 -- and then Lhs.Cmpn = Rhs.Cmpn
6328 -- The expression is folded by the back-end for adjacent fields. This
6329 -- function is called for tagged record in only one occasion: for imple-
6330 -- menting predefined primitive equality (see Predefined_Primitives_Bodies)
6331 -- otherwise the primitive "=" is used directly.
6333 function Expand_Record_Equality
6341 Loc : constant Source_Ptr := Sloc (Nod);
6343 function Suitable_Element (C : Entity_Id) return Entity_Id;
6344 -- Return the first field to compare beginning with C, skipping the
6345 -- inherited components
6347 function Suitable_Element (C : Entity_Id) return Entity_Id is
6352 elsif Ekind (C) /= E_Discriminant
6353 and then Ekind (C) /= E_Component
6355 return Suitable_Element (Next_Entity (C));
6357 elsif Is_Tagged_Type (Typ)
6358 and then C /= Original_Record_Component (C)
6360 return Suitable_Element (Next_Entity (C));
6362 elsif Chars (C) = Name_uController
6363 or else Chars (C) = Name_uTag
6365 return Suitable_Element (Next_Entity (C));
6370 end Suitable_Element;
6375 First_Time : Boolean := True;
6377 -- Start of processing for Expand_Record_Equality
6380 -- Special processing for the unchecked union case, which will occur
6381 -- only in the context of tagged types and dynamic dispatching, since
6382 -- other cases are handled statically. We return True, but insert a
6383 -- raise Program_Error statement.
6385 if Is_Unchecked_Union (Typ) then
6387 -- If this is a component of an enclosing record, return the Raise
6388 -- statement directly.
6390 if No (Parent (Lhs)) then
6392 Make_Raise_Program_Error (Loc,
6393 Reason => PE_Unchecked_Union_Restriction);
6394 Set_Etype (Result, Standard_Boolean);
6399 Make_Raise_Program_Error (Loc,
6400 Reason => PE_Unchecked_Union_Restriction));
6401 return New_Occurrence_Of (Standard_True, Loc);
6405 -- Generates the following code: (assuming that Typ has one Discr and
6406 -- component C2 is also a record)
6409 -- and then Lhs.Discr1 = Rhs.Discr1
6410 -- and then Lhs.C1 = Rhs.C1
6411 -- and then Lhs.C2.C1=Rhs.C2.C1 and then ... Lhs.C2.Cn=Rhs.C2.Cn
6413 -- and then Lhs.Cmpn = Rhs.Cmpn
6415 Result := New_Reference_To (Standard_True, Loc);
6416 C := Suitable_Element (First_Entity (Typ));
6418 while Present (C) loop
6426 First_Time := False;
6431 New_Lhs := New_Copy_Tree (Lhs);
6432 New_Rhs := New_Copy_Tree (Rhs);
6437 Left_Opnd => Result,
6439 Expand_Composite_Equality (Nod, Etype (C),
6441 Make_Selected_Component (Loc,
6443 Selector_Name => New_Reference_To (C, Loc)),
6445 Make_Selected_Component (Loc,
6447 Selector_Name => New_Reference_To (C, Loc)),
6451 C := Suitable_Element (Next_Entity (C));
6455 end Expand_Record_Equality;
6457 -------------------------------------
6458 -- Fixup_Universal_Fixed_Operation --
6459 -------------------------------------
6461 procedure Fixup_Universal_Fixed_Operation (N : Node_Id) is
6462 Conv : constant Node_Id := Parent (N);
6465 -- We must have a type conversion immediately above us
6467 pragma Assert (Nkind (Conv) = N_Type_Conversion);
6469 -- Normally the type conversion gives our target type. The exception
6470 -- occurs in the case of the Round attribute, where the conversion
6471 -- will be to universal real, and our real type comes from the Round
6472 -- attribute (as well as an indication that we must round the result)
6474 if Nkind (Parent (Conv)) = N_Attribute_Reference
6475 and then Attribute_Name (Parent (Conv)) = Name_Round
6477 Set_Etype (N, Etype (Parent (Conv)));
6478 Set_Rounded_Result (N);
6480 -- Normal case where type comes from conversion above us
6483 Set_Etype (N, Etype (Conv));
6485 end Fixup_Universal_Fixed_Operation;
6487 ------------------------------
6488 -- Get_Allocator_Final_List --
6489 ------------------------------
6491 function Get_Allocator_Final_List
6497 Loc : constant Source_Ptr := Sloc (N);
6501 -- If the context is an access parameter, we need to create
6502 -- a non-anonymous access type in order to have a usable
6503 -- final list, because there is otherwise no pool to which
6504 -- the allocated object can belong. We create both the type
6505 -- and the finalization chain here, because freezing an
6506 -- internal type does not create such a chain. The Final_Chain
6507 -- that is thus created is shared by the access parameter.
6509 if Ekind (PtrT) = E_Anonymous_Access_Type then
6510 Acc := Make_Defining_Identifier (Loc, New_Internal_Name ('J'));
6512 Make_Full_Type_Declaration (Loc,
6513 Defining_Identifier => Acc,
6515 Make_Access_To_Object_Definition (Loc,
6516 Subtype_Indication =>
6517 New_Occurrence_Of (T, Loc))));
6519 Build_Final_List (N, Acc);
6520 Set_Associated_Final_Chain (PtrT, Associated_Final_Chain (Acc));
6521 return Find_Final_List (Acc);
6524 return Find_Final_List (PtrT);
6526 end Get_Allocator_Final_List;
6528 -------------------------------
6529 -- Insert_Dereference_Action --
6530 -------------------------------
6532 procedure Insert_Dereference_Action (N : Node_Id) is
6533 Loc : constant Source_Ptr := Sloc (N);
6534 Typ : constant Entity_Id := Etype (N);
6535 Pool : constant Entity_Id := Associated_Storage_Pool (Typ);
6537 function Is_Checked_Storage_Pool (P : Entity_Id) return Boolean;
6538 -- return true if type of P is derived from Checked_Pool;
6540 function Is_Checked_Storage_Pool (P : Entity_Id) return Boolean is
6549 while T /= Etype (T) loop
6550 if Is_RTE (T, RE_Checked_Pool) then
6558 end Is_Checked_Storage_Pool;
6560 -- Start of processing for Insert_Dereference_Action
6563 if not Comes_From_Source (Parent (N)) then
6566 elsif not Is_Checked_Storage_Pool (Pool) then
6571 Make_Procedure_Call_Statement (Loc,
6572 Name => New_Reference_To (
6573 Find_Prim_Op (Etype (Pool), Name_Dereference), Loc),
6575 Parameter_Associations => New_List (
6579 New_Reference_To (Pool, Loc),
6581 -- Storage_Address. We use the attribute Pool_Address,
6582 -- which uses the pointer itself to find the address of
6583 -- the object, and which handles unconstrained arrays
6584 -- properly by computing the address of the template.
6585 -- i.e. the correct address of the corresponding allocation.
6587 Make_Attribute_Reference (Loc,
6588 Prefix => Duplicate_Subexpr_Move_Checks (N),
6589 Attribute_Name => Name_Pool_Address),
6591 -- Size_In_Storage_Elements
6593 Make_Op_Divide (Loc,
6595 Make_Attribute_Reference (Loc,
6597 Make_Explicit_Dereference (Loc,
6598 Duplicate_Subexpr_Move_Checks (N)),
6599 Attribute_Name => Name_Size),
6601 Make_Integer_Literal (Loc, System_Storage_Unit)),
6605 Make_Attribute_Reference (Loc,
6607 Make_Explicit_Dereference (Loc,
6608 Duplicate_Subexpr_Move_Checks (N)),
6609 Attribute_Name => Name_Alignment))));
6612 when RE_Not_Available =>
6614 end Insert_Dereference_Action;
6616 ------------------------------
6617 -- Make_Array_Comparison_Op --
6618 ------------------------------
6620 -- This is a hand-coded expansion of the following generic function:
6623 -- type elem is (<>);
6624 -- type index is (<>);
6625 -- type a is array (index range <>) of elem;
6627 -- function Gnnn (X : a; Y: a) return boolean is
6628 -- J : index := Y'first;
6631 -- if X'length = 0 then
6634 -- elsif Y'length = 0 then
6638 -- for I in X'range loop
6639 -- if X (I) = Y (J) then
6640 -- if J = Y'last then
6643 -- J := index'succ (J);
6647 -- return X (I) > Y (J);
6651 -- return X'length > Y'length;
6655 -- Note that since we are essentially doing this expansion by hand, we
6656 -- do not need to generate an actual or formal generic part, just the
6657 -- instantiated function itself.
6659 function Make_Array_Comparison_Op
6664 Loc : constant Source_Ptr := Sloc (Nod);
6666 X : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uX);
6667 Y : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uY);
6668 I : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uI);
6669 J : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uJ);
6671 Index : constant Entity_Id := Base_Type (Etype (First_Index (Typ)));
6673 Loop_Statement : Node_Id;
6674 Loop_Body : Node_Id;
6677 Final_Expr : Node_Id;
6678 Func_Body : Node_Id;
6679 Func_Name : Entity_Id;
6685 -- if J = Y'last then
6688 -- J := index'succ (J);
6692 Make_Implicit_If_Statement (Nod,
6695 Left_Opnd => New_Reference_To (J, Loc),
6697 Make_Attribute_Reference (Loc,
6698 Prefix => New_Reference_To (Y, Loc),
6699 Attribute_Name => Name_Last)),
6701 Then_Statements => New_List (
6702 Make_Exit_Statement (Loc)),
6706 Make_Assignment_Statement (Loc,
6707 Name => New_Reference_To (J, Loc),
6709 Make_Attribute_Reference (Loc,
6710 Prefix => New_Reference_To (Index, Loc),
6711 Attribute_Name => Name_Succ,
6712 Expressions => New_List (New_Reference_To (J, Loc))))));
6714 -- if X (I) = Y (J) then
6717 -- return X (I) > Y (J);
6721 Make_Implicit_If_Statement (Nod,
6725 Make_Indexed_Component (Loc,
6726 Prefix => New_Reference_To (X, Loc),
6727 Expressions => New_List (New_Reference_To (I, Loc))),
6730 Make_Indexed_Component (Loc,
6731 Prefix => New_Reference_To (Y, Loc),
6732 Expressions => New_List (New_Reference_To (J, Loc)))),
6734 Then_Statements => New_List (Inner_If),
6736 Else_Statements => New_List (
6737 Make_Return_Statement (Loc,
6741 Make_Indexed_Component (Loc,
6742 Prefix => New_Reference_To (X, Loc),
6743 Expressions => New_List (New_Reference_To (I, Loc))),
6746 Make_Indexed_Component (Loc,
6747 Prefix => New_Reference_To (Y, Loc),
6748 Expressions => New_List (
6749 New_Reference_To (J, Loc)))))));
6751 -- for I in X'range loop
6756 Make_Implicit_Loop_Statement (Nod,
6757 Identifier => Empty,
6760 Make_Iteration_Scheme (Loc,
6761 Loop_Parameter_Specification =>
6762 Make_Loop_Parameter_Specification (Loc,
6763 Defining_Identifier => I,
6764 Discrete_Subtype_Definition =>
6765 Make_Attribute_Reference (Loc,
6766 Prefix => New_Reference_To (X, Loc),
6767 Attribute_Name => Name_Range))),
6769 Statements => New_List (Loop_Body));
6771 -- if X'length = 0 then
6773 -- elsif Y'length = 0 then
6776 -- for ... loop ... end loop;
6777 -- return X'length > Y'length;
6781 Make_Attribute_Reference (Loc,
6782 Prefix => New_Reference_To (X, Loc),
6783 Attribute_Name => Name_Length);
6786 Make_Attribute_Reference (Loc,
6787 Prefix => New_Reference_To (Y, Loc),
6788 Attribute_Name => Name_Length);
6792 Left_Opnd => Length1,
6793 Right_Opnd => Length2);
6796 Make_Implicit_If_Statement (Nod,
6800 Make_Attribute_Reference (Loc,
6801 Prefix => New_Reference_To (X, Loc),
6802 Attribute_Name => Name_Length),
6804 Make_Integer_Literal (Loc, 0)),
6808 Make_Return_Statement (Loc,
6809 Expression => New_Reference_To (Standard_False, Loc))),
6811 Elsif_Parts => New_List (
6812 Make_Elsif_Part (Loc,
6816 Make_Attribute_Reference (Loc,
6817 Prefix => New_Reference_To (Y, Loc),
6818 Attribute_Name => Name_Length),
6820 Make_Integer_Literal (Loc, 0)),
6824 Make_Return_Statement (Loc,
6825 Expression => New_Reference_To (Standard_True, Loc))))),
6827 Else_Statements => New_List (
6829 Make_Return_Statement (Loc,
6830 Expression => Final_Expr)));
6834 Formals := New_List (
6835 Make_Parameter_Specification (Loc,
6836 Defining_Identifier => X,
6837 Parameter_Type => New_Reference_To (Typ, Loc)),
6839 Make_Parameter_Specification (Loc,
6840 Defining_Identifier => Y,
6841 Parameter_Type => New_Reference_To (Typ, Loc)));
6843 -- function Gnnn (...) return boolean is
6844 -- J : index := Y'first;
6849 Func_Name := Make_Defining_Identifier (Loc, New_Internal_Name ('G'));
6852 Make_Subprogram_Body (Loc,
6854 Make_Function_Specification (Loc,
6855 Defining_Unit_Name => Func_Name,
6856 Parameter_Specifications => Formals,
6857 Subtype_Mark => New_Reference_To (Standard_Boolean, Loc)),
6859 Declarations => New_List (
6860 Make_Object_Declaration (Loc,
6861 Defining_Identifier => J,
6862 Object_Definition => New_Reference_To (Index, Loc),
6864 Make_Attribute_Reference (Loc,
6865 Prefix => New_Reference_To (Y, Loc),
6866 Attribute_Name => Name_First))),
6868 Handled_Statement_Sequence =>
6869 Make_Handled_Sequence_Of_Statements (Loc,
6870 Statements => New_List (If_Stat)));
6874 end Make_Array_Comparison_Op;
6876 ---------------------------
6877 -- Make_Boolean_Array_Op --
6878 ---------------------------
6880 -- For logical operations on boolean arrays, expand in line the
6881 -- following, replacing 'and' with 'or' or 'xor' where needed:
6883 -- function Annn (A : typ; B: typ) return typ is
6886 -- for J in A'range loop
6887 -- C (J) := A (J) op B (J);
6892 -- Here typ is the boolean array type
6894 function Make_Boolean_Array_Op
6899 Loc : constant Source_Ptr := Sloc (N);
6901 A : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uA);
6902 B : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uB);
6903 C : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uC);
6904 J : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uJ);
6912 Func_Name : Entity_Id;
6913 Func_Body : Node_Id;
6914 Loop_Statement : Node_Id;
6918 Make_Indexed_Component (Loc,
6919 Prefix => New_Reference_To (A, Loc),
6920 Expressions => New_List (New_Reference_To (J, Loc)));
6923 Make_Indexed_Component (Loc,
6924 Prefix => New_Reference_To (B, Loc),
6925 Expressions => New_List (New_Reference_To (J, Loc)));
6928 Make_Indexed_Component (Loc,
6929 Prefix => New_Reference_To (C, Loc),
6930 Expressions => New_List (New_Reference_To (J, Loc)));
6932 if Nkind (N) = N_Op_And then
6938 elsif Nkind (N) = N_Op_Or then
6952 Make_Implicit_Loop_Statement (N,
6953 Identifier => Empty,
6956 Make_Iteration_Scheme (Loc,
6957 Loop_Parameter_Specification =>
6958 Make_Loop_Parameter_Specification (Loc,
6959 Defining_Identifier => J,
6960 Discrete_Subtype_Definition =>
6961 Make_Attribute_Reference (Loc,
6962 Prefix => New_Reference_To (A, Loc),
6963 Attribute_Name => Name_Range))),
6965 Statements => New_List (
6966 Make_Assignment_Statement (Loc,
6968 Expression => Op)));
6970 Formals := New_List (
6971 Make_Parameter_Specification (Loc,
6972 Defining_Identifier => A,
6973 Parameter_Type => New_Reference_To (Typ, Loc)),
6975 Make_Parameter_Specification (Loc,
6976 Defining_Identifier => B,
6977 Parameter_Type => New_Reference_To (Typ, Loc)));
6980 Make_Defining_Identifier (Loc, New_Internal_Name ('A'));
6981 Set_Is_Inlined (Func_Name);
6984 Make_Subprogram_Body (Loc,
6986 Make_Function_Specification (Loc,
6987 Defining_Unit_Name => Func_Name,
6988 Parameter_Specifications => Formals,
6989 Subtype_Mark => New_Reference_To (Typ, Loc)),
6991 Declarations => New_List (
6992 Make_Object_Declaration (Loc,
6993 Defining_Identifier => C,
6994 Object_Definition => New_Reference_To (Typ, Loc))),
6996 Handled_Statement_Sequence =>
6997 Make_Handled_Sequence_Of_Statements (Loc,
6998 Statements => New_List (
7000 Make_Return_Statement (Loc,
7001 Expression => New_Reference_To (C, Loc)))));
7004 end Make_Boolean_Array_Op;
7006 ------------------------
7007 -- Rewrite_Comparison --
7008 ------------------------
7010 procedure Rewrite_Comparison (N : Node_Id) is
7011 Typ : constant Entity_Id := Etype (N);
7012 Op1 : constant Node_Id := Left_Opnd (N);
7013 Op2 : constant Node_Id := Right_Opnd (N);
7015 Res : constant Compare_Result := Compile_Time_Compare (Op1, Op2);
7016 -- Res indicates if compare outcome can be determined at compile time
7018 True_Result : Boolean;
7019 False_Result : Boolean;
7022 case N_Op_Compare (Nkind (N)) is
7024 True_Result := Res = EQ;
7025 False_Result := Res = LT or else Res = GT or else Res = NE;
7028 True_Result := Res in Compare_GE;
7029 False_Result := Res = LT;
7032 True_Result := Res = GT;
7033 False_Result := Res in Compare_LE;
7036 True_Result := Res = LT;
7037 False_Result := Res in Compare_GE;
7040 True_Result := Res in Compare_LE;
7041 False_Result := Res = GT;
7044 True_Result := Res = NE;
7045 False_Result := Res = LT or else Res = GT or else Res = EQ;
7050 Convert_To (Typ, New_Occurrence_Of (Standard_True, Sloc (N))));
7051 Analyze_And_Resolve (N, Typ);
7052 Warn_On_Known_Condition (N);
7054 elsif False_Result then
7056 Convert_To (Typ, New_Occurrence_Of (Standard_False, Sloc (N))));
7057 Analyze_And_Resolve (N, Typ);
7058 Warn_On_Known_Condition (N);
7060 end Rewrite_Comparison;
7062 ----------------------------
7063 -- Safe_In_Place_Array_Op --
7064 ----------------------------
7066 function Safe_In_Place_Array_Op
7074 function Is_Safe_Operand (Op : Node_Id) return Boolean;
7075 -- Operand is safe if it cannot overlap part of the target of the
7076 -- operation. If the operand and the target are identical, the operand
7077 -- is safe. The operand can be empty in the case of negation.
7079 function Is_Unaliased (N : Node_Id) return Boolean;
7080 -- Check that N is a stand-alone entity.
7086 function Is_Unaliased (N : Node_Id) return Boolean is
7090 and then No (Address_Clause (Entity (N)))
7091 and then No (Renamed_Object (Entity (N)));
7094 ---------------------
7095 -- Is_Safe_Operand --
7096 ---------------------
7098 function Is_Safe_Operand (Op : Node_Id) return Boolean is
7103 elsif Is_Entity_Name (Op) then
7104 return Is_Unaliased (Op);
7106 elsif Nkind (Op) = N_Indexed_Component
7107 or else Nkind (Op) = N_Selected_Component
7109 return Is_Unaliased (Prefix (Op));
7111 elsif Nkind (Op) = N_Slice then
7113 Is_Unaliased (Prefix (Op))
7114 and then Entity (Prefix (Op)) /= Target;
7116 elsif Nkind (Op) = N_Op_Not then
7117 return Is_Safe_Operand (Right_Opnd (Op));
7122 end Is_Safe_Operand;
7124 -- Start of processing for Is_Safe_In_Place_Array_Op
7127 -- We skip this processing if the component size is not the
7128 -- same as a system storage unit (since at least for NOT
7129 -- this would cause problems).
7131 if Component_Size (Etype (Lhs)) /= System_Storage_Unit then
7134 -- Cannot do in place stuff on Java_VM since cannot pass addresses
7139 -- Cannot do in place stuff if non-standard Boolean representation
7141 elsif Has_Non_Standard_Rep (Component_Type (Etype (Lhs))) then
7144 elsif not Is_Unaliased (Lhs) then
7147 Target := Entity (Lhs);
7150 Is_Safe_Operand (Op1)
7151 and then Is_Safe_Operand (Op2);
7153 end Safe_In_Place_Array_Op;
7155 -----------------------
7156 -- Tagged_Membership --
7157 -----------------------
7159 -- There are two different cases to consider depending on whether
7160 -- the right operand is a class-wide type or not. If not we just
7161 -- compare the actual tag of the left expr to the target type tag:
7163 -- Left_Expr.Tag = Right_Type'Tag;
7165 -- If it is a class-wide type we use the RT function CW_Membership which
7166 -- is usually implemented by looking in the ancestor tables contained in
7167 -- the dispatch table pointed by Left_Expr.Tag for Typ'Tag
7169 function Tagged_Membership (N : Node_Id) return Node_Id is
7170 Left : constant Node_Id := Left_Opnd (N);
7171 Right : constant Node_Id := Right_Opnd (N);
7172 Loc : constant Source_Ptr := Sloc (N);
7174 Left_Type : Entity_Id;
7175 Right_Type : Entity_Id;
7179 Left_Type := Etype (Left);
7180 Right_Type := Etype (Right);
7182 if Is_Class_Wide_Type (Left_Type) then
7183 Left_Type := Root_Type (Left_Type);
7187 Make_Selected_Component (Loc,
7188 Prefix => Relocate_Node (Left),
7189 Selector_Name => New_Reference_To (Tag_Component (Left_Type), Loc));
7191 if Is_Class_Wide_Type (Right_Type) then
7193 Make_DT_Access_Action (Left_Type,
7194 Action => CW_Membership,
7198 Access_Disp_Table (Root_Type (Right_Type)), Loc)));
7202 Left_Opnd => Obj_Tag,
7204 New_Reference_To (Access_Disp_Table (Right_Type), Loc));
7207 end Tagged_Membership;
7209 ------------------------------
7210 -- Unary_Op_Validity_Checks --
7211 ------------------------------
7213 procedure Unary_Op_Validity_Checks (N : Node_Id) is
7215 if Validity_Checks_On and Validity_Check_Operands then
7216 Ensure_Valid (Right_Opnd (N));
7218 end Unary_Op_Validity_Checks;