1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2005, 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_Ch3
; use Sem_Ch3
;
51 with Sem_Ch13
; use Sem_Ch13
;
52 with Sem_Eval
; use Sem_Eval
;
53 with Sem_Res
; use Sem_Res
;
54 with Sem_Type
; use Sem_Type
;
55 with Sem_Util
; use Sem_Util
;
56 with Sem_Warn
; use Sem_Warn
;
57 with Sinfo
; use Sinfo
;
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
100 Typ
: Entity_Id
) return Node_Id
;
101 -- Expand an array equality into a call to a function implementing this
102 -- equality, and a call to it. Loc is the location for the generated
103 -- nodes. Lhs and Rhs are the array expressions to be compared.
104 -- Bodies is a list on which to attach bodies of local functions that
105 -- are created in the process. It is the responsibility of the
106 -- caller to insert those bodies at the right place. Nod provides
107 -- the Sloc value for the generated code. Normally the types used
108 -- for the generated equality routine are taken from Lhs and Rhs.
109 -- However, in some situations of generated code, the Etype fields
110 -- of Lhs and Rhs are not set yet. In such cases, Typ supplies the
111 -- type to be used for the formal parameters.
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
122 Bodies
: List_Id
) return Node_Id
;
123 -- Local recursive function used to expand equality for nested
124 -- composite types. Used by Expand_Record/Array_Equality, Bodies
125 -- is a list on which to attach bodies of local functions that are
126 -- created in the process. This is the responsability of the caller
127 -- to insert those bodies at the right place. Nod provides the Sloc
128 -- value for generated code. Lhs and Rhs are the left and right sides
129 -- for the comparison, and Typ is the type of the arrays to compare.
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
153 PtrT
: Entity_Id
) return Entity_Id
;
154 -- If the designated type is controlled, build final_list expression
155 -- for created object. If context is an access parameter, create a
156 -- local access type to have a usable finalization list.
158 function Has_Inferable_Discriminants
(N
: Node_Id
) return Boolean;
159 -- Ada 2005 (AI-216): A view of an Unchecked_Union object has inferable
160 -- discriminants if it has a constrained nominal type, unless the object
161 -- is a component of an enclosing Unchecked_Union object that is subject
162 -- to a per-object constraint and the enclosing object lacks inferable
165 -- An expression of an Unchecked_Union type has inferable discriminants
166 -- if it is either a name of an object with inferable discriminants or a
167 -- qualified expression whose subtype mark denotes a constrained subtype.
169 procedure Insert_Dereference_Action
(N
: Node_Id
);
170 -- N is an expression whose type is an access. When the type of the
171 -- associated storage pool is derived from Checked_Pool, generate a
172 -- call to the 'Dereference' primitive operation.
174 function Make_Array_Comparison_Op
176 Nod
: Node_Id
) return Node_Id
;
177 -- Comparisons between arrays are expanded in line. This function
178 -- produces the body of the implementation of (a > b), where a and b
179 -- are one-dimensional arrays of some discrete type. The original
180 -- node is then expanded into the appropriate call to this function.
181 -- Nod provides the Sloc value for the generated code.
183 function Make_Boolean_Array_Op
185 N
: Node_Id
) return Node_Id
;
186 -- Boolean operations on boolean arrays are expanded in line. This
187 -- function produce the body for the node N, which is (a and b),
188 -- (a or b), or (a xor b). It is used only the normal case and not
189 -- the packed case. The type involved, Typ, is the Boolean array type,
190 -- and the logical operations in the body are simple boolean operations.
191 -- Note that Typ is always a constrained type (the caller has ensured
192 -- this by using Convert_To_Actual_Subtype if necessary).
194 procedure Rewrite_Comparison
(N
: Node_Id
);
195 -- N is the node for a compile time comparison. If this outcome of this
196 -- comparison can be determined at compile time, then the node N can be
197 -- rewritten with True or False. If the outcome cannot be determined at
198 -- compile time, the call has no effect.
200 function Tagged_Membership
(N
: Node_Id
) return Node_Id
;
201 -- Construct the expression corresponding to the tagged membership test.
202 -- Deals with a second operand being (or not) a class-wide type.
204 function Safe_In_Place_Array_Op
207 Op2
: Node_Id
) return Boolean;
208 -- In the context of an assignment, where the right-hand side is a
209 -- boolean operation on arrays, check whether operation can be performed
212 procedure Unary_Op_Validity_Checks
(N
: Node_Id
);
213 pragma Inline
(Unary_Op_Validity_Checks
);
214 -- Performs validity checks for a unary operator
216 -------------------------------
217 -- Binary_Op_Validity_Checks --
218 -------------------------------
220 procedure Binary_Op_Validity_Checks
(N
: Node_Id
) is
222 if Validity_Checks_On
and Validity_Check_Operands
then
223 Ensure_Valid
(Left_Opnd
(N
));
224 Ensure_Valid
(Right_Opnd
(N
));
226 end Binary_Op_Validity_Checks
;
228 ------------------------------------
229 -- Build_Boolean_Array_Proc_Call --
230 ------------------------------------
232 procedure Build_Boolean_Array_Proc_Call
237 Loc
: constant Source_Ptr
:= Sloc
(N
);
238 Kind
: constant Node_Kind
:= Nkind
(Expression
(N
));
239 Target
: constant Node_Id
:=
240 Make_Attribute_Reference
(Loc
,
242 Attribute_Name
=> Name_Address
);
244 Arg1
: constant Node_Id
:= Op1
;
245 Arg2
: Node_Id
:= Op2
;
247 Proc_Name
: Entity_Id
;
250 if Kind
= N_Op_Not
then
251 if Nkind
(Op1
) in N_Binary_Op
then
253 -- Use negated version of the binary operators
255 if Nkind
(Op1
) = N_Op_And
then
256 Proc_Name
:= RTE
(RE_Vector_Nand
);
258 elsif Nkind
(Op1
) = N_Op_Or
then
259 Proc_Name
:= RTE
(RE_Vector_Nor
);
261 else pragma Assert
(Nkind
(Op1
) = N_Op_Xor
);
262 Proc_Name
:= RTE
(RE_Vector_Xor
);
266 Make_Procedure_Call_Statement
(Loc
,
267 Name
=> New_Occurrence_Of
(Proc_Name
, Loc
),
269 Parameter_Associations
=> New_List
(
271 Make_Attribute_Reference
(Loc
,
272 Prefix
=> Left_Opnd
(Op1
),
273 Attribute_Name
=> Name_Address
),
275 Make_Attribute_Reference
(Loc
,
276 Prefix
=> Right_Opnd
(Op1
),
277 Attribute_Name
=> Name_Address
),
279 Make_Attribute_Reference
(Loc
,
280 Prefix
=> Left_Opnd
(Op1
),
281 Attribute_Name
=> Name_Length
)));
284 Proc_Name
:= RTE
(RE_Vector_Not
);
287 Make_Procedure_Call_Statement
(Loc
,
288 Name
=> New_Occurrence_Of
(Proc_Name
, Loc
),
289 Parameter_Associations
=> New_List
(
292 Make_Attribute_Reference
(Loc
,
294 Attribute_Name
=> Name_Address
),
296 Make_Attribute_Reference
(Loc
,
298 Attribute_Name
=> Name_Length
)));
302 -- We use the following equivalences:
304 -- (not X) or (not Y) = not (X and Y) = Nand (X, Y)
305 -- (not X) and (not Y) = not (X or Y) = Nor (X, Y)
306 -- (not X) xor (not Y) = X xor Y
307 -- X xor (not Y) = not (X xor Y) = Nxor (X, Y)
309 if Nkind
(Op1
) = N_Op_Not
then
310 if Kind
= N_Op_And
then
311 Proc_Name
:= RTE
(RE_Vector_Nor
);
313 elsif Kind
= N_Op_Or
then
314 Proc_Name
:= RTE
(RE_Vector_Nand
);
317 Proc_Name
:= RTE
(RE_Vector_Xor
);
321 if Kind
= N_Op_And
then
322 Proc_Name
:= RTE
(RE_Vector_And
);
324 elsif Kind
= N_Op_Or
then
325 Proc_Name
:= RTE
(RE_Vector_Or
);
327 elsif Nkind
(Op2
) = N_Op_Not
then
328 Proc_Name
:= RTE
(RE_Vector_Nxor
);
329 Arg2
:= Right_Opnd
(Op2
);
332 Proc_Name
:= RTE
(RE_Vector_Xor
);
337 Make_Procedure_Call_Statement
(Loc
,
338 Name
=> New_Occurrence_Of
(Proc_Name
, Loc
),
339 Parameter_Associations
=> New_List
(
341 Make_Attribute_Reference
(Loc
,
343 Attribute_Name
=> Name_Address
),
344 Make_Attribute_Reference
(Loc
,
346 Attribute_Name
=> Name_Address
),
347 Make_Attribute_Reference
(Loc
,
349 Attribute_Name
=> Name_Length
)));
352 Rewrite
(N
, Call_Node
);
356 when RE_Not_Available
=>
358 end Build_Boolean_Array_Proc_Call
;
360 ---------------------------------
361 -- Expand_Allocator_Expression --
362 ---------------------------------
364 procedure Expand_Allocator_Expression
(N
: Node_Id
) is
365 Loc
: constant Source_Ptr
:= Sloc
(N
);
366 Exp
: constant Node_Id
:= Expression
(Expression
(N
));
367 Indic
: constant Node_Id
:= Subtype_Mark
(Expression
(N
));
368 PtrT
: constant Entity_Id
:= Etype
(N
);
369 T
: constant Entity_Id
:= Entity
(Indic
);
374 Aggr_In_Place
: constant Boolean := Is_Delayed_Aggregate
(Exp
);
376 Tag_Assign
: Node_Id
;
380 if Is_Tagged_Type
(T
) or else Controlled_Type
(T
) then
382 -- Actions inserted before:
383 -- Temp : constant ptr_T := new T'(Expression);
384 -- <no CW> Temp._tag := T'tag;
385 -- <CTRL> Adjust (Finalizable (Temp.all));
386 -- <CTRL> Attach_To_Final_List (Finalizable (Temp.all));
388 -- We analyze by hand the new internal allocator to avoid
389 -- any recursion and inappropriate call to Initialize
391 if not Aggr_In_Place
then
392 Remove_Side_Effects
(Exp
);
396 Make_Defining_Identifier
(Loc
, New_Internal_Name
('P'));
398 -- For a class wide allocation generate the following code:
400 -- type Equiv_Record is record ... end record;
401 -- implicit subtype CW is <Class_Wide_Subytpe>;
402 -- temp : PtrT := new CW'(CW!(expr));
404 if Is_Class_Wide_Type
(T
) then
405 Expand_Subtype_From_Expr
(Empty
, T
, Indic
, Exp
);
407 Set_Expression
(Expression
(N
),
408 Unchecked_Convert_To
(Entity
(Indic
), Exp
));
410 Analyze_And_Resolve
(Expression
(N
), Entity
(Indic
));
413 if Aggr_In_Place
then
415 Make_Object_Declaration
(Loc
,
416 Defining_Identifier
=> Temp
,
417 Object_Definition
=> New_Reference_To
(PtrT
, Loc
),
420 New_Reference_To
(Etype
(Exp
), Loc
)));
422 Set_Comes_From_Source
423 (Expression
(Tmp_Node
), Comes_From_Source
(N
));
425 Set_No_Initialization
(Expression
(Tmp_Node
));
426 Insert_Action
(N
, Tmp_Node
);
428 if Controlled_Type
(T
)
429 and then Ekind
(PtrT
) = E_Anonymous_Access_Type
431 -- Create local finalization list for access parameter
433 Flist
:= Get_Allocator_Final_List
(N
, Base_Type
(T
), PtrT
);
436 Convert_Aggr_In_Allocator
(Tmp_Node
, Exp
);
438 Node
:= Relocate_Node
(N
);
441 Make_Object_Declaration
(Loc
,
442 Defining_Identifier
=> Temp
,
443 Constant_Present
=> True,
444 Object_Definition
=> New_Reference_To
(PtrT
, Loc
),
445 Expression
=> Node
));
448 -- Suppress the tag assignment when Java_VM because JVM tags
449 -- are represented implicitly in objects.
451 if Is_Tagged_Type
(T
)
452 and then not Is_Class_Wide_Type
(T
)
456 Make_Assignment_Statement
(Loc
,
458 Make_Selected_Component
(Loc
,
459 Prefix
=> New_Reference_To
(Temp
, Loc
),
461 New_Reference_To
(First_Tag_Component
(T
), Loc
)),
464 Unchecked_Convert_To
(RTE
(RE_Tag
),
466 (Elists
.Node
(First_Elmt
(Access_Disp_Table
(T
))),
469 -- The previous assignment has to be done in any case
471 Set_Assignment_OK
(Name
(Tag_Assign
));
472 Insert_Action
(N
, Tag_Assign
);
474 elsif Is_Private_Type
(T
)
475 and then Is_Tagged_Type
(Underlying_Type
(T
))
479 Utyp
: constant Entity_Id
:= Underlying_Type
(T
);
480 Ref
: constant Node_Id
:=
481 Unchecked_Convert_To
(Utyp
,
482 Make_Explicit_Dereference
(Loc
,
483 New_Reference_To
(Temp
, Loc
)));
487 Make_Assignment_Statement
(Loc
,
489 Make_Selected_Component
(Loc
,
492 New_Reference_To
(First_Tag_Component
(Utyp
), Loc
)),
495 Unchecked_Convert_To
(RTE
(RE_Tag
),
497 Elists
.Node
(First_Elmt
(Access_Disp_Table
(Utyp
))),
500 Set_Assignment_OK
(Name
(Tag_Assign
));
501 Insert_Action
(N
, Tag_Assign
);
505 if Controlled_Type
(Designated_Type
(PtrT
))
506 and then Controlled_Type
(T
)
510 Apool
: constant Entity_Id
:=
511 Associated_Storage_Pool
(PtrT
);
514 -- If it is an allocation on the secondary stack
515 -- (i.e. a value returned from a function), the object
516 -- is attached on the caller side as soon as the call
517 -- is completed (see Expand_Ctrl_Function_Call)
519 if Is_RTE
(Apool
, RE_SS_Pool
) then
521 F
: constant Entity_Id
:=
522 Make_Defining_Identifier
(Loc
,
523 New_Internal_Name
('F'));
526 Make_Object_Declaration
(Loc
,
527 Defining_Identifier
=> F
,
528 Object_Definition
=> New_Reference_To
(RTE
529 (RE_Finalizable_Ptr
), Loc
)));
531 Flist
:= New_Reference_To
(F
, Loc
);
532 Attach
:= Make_Integer_Literal
(Loc
, 1);
535 -- Normal case, not a secondary stack allocation
538 if Controlled_Type
(T
)
539 and then Ekind
(PtrT
) = E_Anonymous_Access_Type
541 -- Create local finalization list for access parameter
544 Get_Allocator_Final_List
(N
, Base_Type
(T
), PtrT
);
546 Flist
:= Find_Final_List
(PtrT
);
549 Attach
:= Make_Integer_Literal
(Loc
, 2);
552 if not Aggr_In_Place
then
557 -- An unchecked conversion is needed in the
558 -- classwide case because the designated type
559 -- can be an ancestor of the subtype mark of
562 Unchecked_Convert_To
(T
,
563 Make_Explicit_Dereference
(Loc
,
564 New_Reference_To
(Temp
, Loc
))),
568 With_Attach
=> Attach
));
573 Rewrite
(N
, New_Reference_To
(Temp
, Loc
));
574 Analyze_And_Resolve
(N
, PtrT
);
576 elsif Aggr_In_Place
then
578 Make_Defining_Identifier
(Loc
, New_Internal_Name
('P'));
580 Make_Object_Declaration
(Loc
,
581 Defining_Identifier
=> Temp
,
582 Object_Definition
=> New_Reference_To
(PtrT
, Loc
),
583 Expression
=> Make_Allocator
(Loc
,
584 New_Reference_To
(Etype
(Exp
), Loc
)));
586 Set_Comes_From_Source
587 (Expression
(Tmp_Node
), Comes_From_Source
(N
));
589 Set_No_Initialization
(Expression
(Tmp_Node
));
590 Insert_Action
(N
, Tmp_Node
);
591 Convert_Aggr_In_Allocator
(Tmp_Node
, Exp
);
592 Rewrite
(N
, New_Reference_To
(Temp
, Loc
));
593 Analyze_And_Resolve
(N
, PtrT
);
595 elsif Is_Access_Type
(Designated_Type
(PtrT
))
596 and then Nkind
(Exp
) = N_Allocator
597 and then Nkind
(Expression
(Exp
)) /= N_Qualified_Expression
599 -- Apply constraint to designated subtype indication
601 Apply_Constraint_Check
(Expression
(Exp
),
602 Designated_Type
(Designated_Type
(PtrT
)),
605 if Nkind
(Expression
(Exp
)) = N_Raise_Constraint_Error
then
607 -- Propagate constraint_error to enclosing allocator
609 Rewrite
(Exp
, New_Copy
(Expression
(Exp
)));
612 -- First check against the type of the qualified expression
614 -- NOTE: The commented call should be correct, but for
615 -- some reason causes the compiler to bomb (sigsegv) on
616 -- ACVC test c34007g, so for now we just perform the old
617 -- (incorrect) test against the designated subtype with
618 -- no sliding in the else part of the if statement below.
621 -- Apply_Constraint_Check (Exp, T, No_Sliding => True);
623 -- A check is also needed in cases where the designated
624 -- subtype is constrained and differs from the subtype
625 -- given in the qualified expression. Note that the check
626 -- on the qualified expression does not allow sliding,
627 -- but this check does (a relaxation from Ada 83).
629 if Is_Constrained
(Designated_Type
(PtrT
))
630 and then not Subtypes_Statically_Match
631 (T
, Designated_Type
(PtrT
))
633 Apply_Constraint_Check
634 (Exp
, Designated_Type
(PtrT
), No_Sliding
=> False);
636 -- The nonsliding check should really be performed
637 -- (unconditionally) against the subtype of the
638 -- qualified expression, but that causes a problem
639 -- with c34007g (see above), so for now we retain this.
642 Apply_Constraint_Check
643 (Exp
, Designated_Type
(PtrT
), No_Sliding
=> True);
648 when RE_Not_Available
=>
650 end Expand_Allocator_Expression
;
652 -----------------------------
653 -- Expand_Array_Comparison --
654 -----------------------------
656 -- Expansion is only required in the case of array types. For the
657 -- unpacked case, an appropriate runtime routine is called. For
658 -- packed cases, and also in some other cases where a runtime
659 -- routine cannot be called, the form of the expansion is:
661 -- [body for greater_nn; boolean_expression]
663 -- The body is built by Make_Array_Comparison_Op, and the form of the
664 -- Boolean expression depends on the operator involved.
666 procedure Expand_Array_Comparison
(N
: Node_Id
) is
667 Loc
: constant Source_Ptr
:= Sloc
(N
);
668 Op1
: Node_Id
:= Left_Opnd
(N
);
669 Op2
: Node_Id
:= Right_Opnd
(N
);
670 Typ1
: constant Entity_Id
:= Base_Type
(Etype
(Op1
));
671 Ctyp
: constant Entity_Id
:= Component_Type
(Typ1
);
675 Func_Name
: Entity_Id
;
679 Byte_Addressable
: constant Boolean := System_Storage_Unit
= Byte
'Size;
680 -- True for byte addressable target
682 function Length_Less_Than_4
(Opnd
: Node_Id
) return Boolean;
683 -- Returns True if the length of the given operand is known to be
684 -- less than 4. Returns False if this length is known to be four
685 -- or greater or is not known at compile time.
687 ------------------------
688 -- Length_Less_Than_4 --
689 ------------------------
691 function Length_Less_Than_4
(Opnd
: Node_Id
) return Boolean is
692 Otyp
: constant Entity_Id
:= Etype
(Opnd
);
695 if Ekind
(Otyp
) = E_String_Literal_Subtype
then
696 return String_Literal_Length
(Otyp
) < 4;
700 Ityp
: constant Entity_Id
:= Etype
(First_Index
(Otyp
));
701 Lo
: constant Node_Id
:= Type_Low_Bound
(Ityp
);
702 Hi
: constant Node_Id
:= Type_High_Bound
(Ityp
);
707 if Compile_Time_Known_Value
(Lo
) then
708 Lov
:= Expr_Value
(Lo
);
713 if Compile_Time_Known_Value
(Hi
) then
714 Hiv
:= Expr_Value
(Hi
);
719 return Hiv
< Lov
+ 3;
722 end Length_Less_Than_4
;
724 -- Start of processing for Expand_Array_Comparison
727 -- Deal first with unpacked case, where we can call a runtime routine
728 -- except that we avoid this for targets for which are not addressable
729 -- by bytes, and for the JVM, since the JVM does not support direct
730 -- addressing of array components.
732 if not Is_Bit_Packed_Array
(Typ1
)
733 and then Byte_Addressable
736 -- The call we generate is:
738 -- Compare_Array_xn[_Unaligned]
739 -- (left'address, right'address, left'length, right'length) <op> 0
741 -- x = U for unsigned, S for signed
742 -- n = 8,16,32,64 for component size
743 -- Add _Unaligned if length < 4 and component size is 8.
744 -- <op> is the standard comparison operator
746 if Component_Size
(Typ1
) = 8 then
747 if Length_Less_Than_4
(Op1
)
749 Length_Less_Than_4
(Op2
)
751 if Is_Unsigned_Type
(Ctyp
) then
752 Comp
:= RE_Compare_Array_U8_Unaligned
;
754 Comp
:= RE_Compare_Array_S8_Unaligned
;
758 if Is_Unsigned_Type
(Ctyp
) then
759 Comp
:= RE_Compare_Array_U8
;
761 Comp
:= RE_Compare_Array_S8
;
765 elsif Component_Size
(Typ1
) = 16 then
766 if Is_Unsigned_Type
(Ctyp
) then
767 Comp
:= RE_Compare_Array_U16
;
769 Comp
:= RE_Compare_Array_S16
;
772 elsif Component_Size
(Typ1
) = 32 then
773 if Is_Unsigned_Type
(Ctyp
) then
774 Comp
:= RE_Compare_Array_U32
;
776 Comp
:= RE_Compare_Array_S32
;
779 else pragma Assert
(Component_Size
(Typ1
) = 64);
780 if Is_Unsigned_Type
(Ctyp
) then
781 Comp
:= RE_Compare_Array_U64
;
783 Comp
:= RE_Compare_Array_S64
;
787 Remove_Side_Effects
(Op1
, Name_Req
=> True);
788 Remove_Side_Effects
(Op2
, Name_Req
=> True);
791 Make_Function_Call
(Sloc
(Op1
),
792 Name
=> New_Occurrence_Of
(RTE
(Comp
), Loc
),
794 Parameter_Associations
=> New_List
(
795 Make_Attribute_Reference
(Loc
,
796 Prefix
=> Relocate_Node
(Op1
),
797 Attribute_Name
=> Name_Address
),
799 Make_Attribute_Reference
(Loc
,
800 Prefix
=> Relocate_Node
(Op2
),
801 Attribute_Name
=> Name_Address
),
803 Make_Attribute_Reference
(Loc
,
804 Prefix
=> Relocate_Node
(Op1
),
805 Attribute_Name
=> Name_Length
),
807 Make_Attribute_Reference
(Loc
,
808 Prefix
=> Relocate_Node
(Op2
),
809 Attribute_Name
=> Name_Length
))));
812 Make_Integer_Literal
(Sloc
(Op2
),
815 Analyze_And_Resolve
(Op1
, Standard_Integer
);
816 Analyze_And_Resolve
(Op2
, Standard_Integer
);
820 -- Cases where we cannot make runtime call
822 -- For (a <= b) we convert to not (a > b)
824 if Chars
(N
) = Name_Op_Le
then
830 Right_Opnd
=> Op2
)));
831 Analyze_And_Resolve
(N
, Standard_Boolean
);
834 -- For < the Boolean expression is
835 -- greater__nn (op2, op1)
837 elsif Chars
(N
) = Name_Op_Lt
then
838 Func_Body
:= Make_Array_Comparison_Op
(Typ1
, N
);
842 Op1
:= Right_Opnd
(N
);
843 Op2
:= Left_Opnd
(N
);
845 -- For (a >= b) we convert to not (a < b)
847 elsif Chars
(N
) = Name_Op_Ge
then
853 Right_Opnd
=> Op2
)));
854 Analyze_And_Resolve
(N
, Standard_Boolean
);
857 -- For > the Boolean expression is
858 -- greater__nn (op1, op2)
861 pragma Assert
(Chars
(N
) = Name_Op_Gt
);
862 Func_Body
:= Make_Array_Comparison_Op
(Typ1
, N
);
865 Func_Name
:= Defining_Unit_Name
(Specification
(Func_Body
));
867 Make_Function_Call
(Loc
,
868 Name
=> New_Reference_To
(Func_Name
, Loc
),
869 Parameter_Associations
=> New_List
(Op1
, Op2
));
871 Insert_Action
(N
, Func_Body
);
873 Analyze_And_Resolve
(N
, Standard_Boolean
);
876 when RE_Not_Available
=>
878 end Expand_Array_Comparison
;
880 ---------------------------
881 -- Expand_Array_Equality --
882 ---------------------------
884 -- Expand an equality function for multi-dimensional arrays. Here is
885 -- an example of such a function for Nb_Dimension = 2
887 -- function Enn (A : atyp; B : btyp) return boolean is
889 -- if (A'length (1) = 0 or else A'length (2) = 0)
891 -- (B'length (1) = 0 or else B'length (2) = 0)
893 -- return True; -- RM 4.5.2(22)
896 -- if A'length (1) /= B'length (1)
898 -- A'length (2) /= B'length (2)
900 -- return False; -- RM 4.5.2(23)
904 -- A1 : Index_T1 := A'first (1);
905 -- B1 : Index_T1 := B'first (1);
909 -- A2 : Index_T2 := A'first (2);
910 -- B2 : Index_T2 := B'first (2);
913 -- if A (A1, A2) /= B (B1, B2) then
917 -- exit when A2 = A'last (2);
918 -- A2 := Index_T2'succ (A2);
919 -- B2 := Index_T2'succ (B2);
923 -- exit when A1 = A'last (1);
924 -- A1 := Index_T1'succ (A1);
925 -- B1 := Index_T1'succ (B1);
932 -- Note on the formal types used (atyp and btyp). If either of the
933 -- arrays is of a private type, we use the underlying type, and
934 -- do an unchecked conversion of the actual. If either of the arrays
935 -- has a bound depending on a discriminant, then we use the base type
936 -- since otherwise we have an escaped discriminant in the function.
938 -- If both arrays are constrained and have the same bounds, we can
939 -- generate a loop with an explicit iteration scheme using a 'Range
940 -- attribute over the first array.
942 function Expand_Array_Equality
947 Typ
: Entity_Id
) return Node_Id
949 Loc
: constant Source_Ptr
:= Sloc
(Nod
);
950 Decls
: constant List_Id
:= New_List
;
951 Index_List1
: constant List_Id
:= New_List
;
952 Index_List2
: constant List_Id
:= New_List
;
956 Func_Name
: Entity_Id
;
959 A
: constant Entity_Id
:= Make_Defining_Identifier
(Loc
, Name_uA
);
960 B
: constant Entity_Id
:= Make_Defining_Identifier
(Loc
, Name_uB
);
964 -- The parameter types to be used for the formals
969 Num
: Int
) return Node_Id
;
970 -- This builds the attribute reference Arr'Nam (Expr)
972 function Component_Equality
(Typ
: Entity_Id
) return Node_Id
;
973 -- Create one statement to compare corresponding components,
974 -- designated by a full set of indices.
976 function Get_Arg_Type
(N
: Node_Id
) return Entity_Id
;
977 -- Given one of the arguments, computes the appropriate type to
978 -- be used for that argument in the corresponding function formal
980 function Handle_One_Dimension
982 Index
: Node_Id
) return Node_Id
;
983 -- This procedure returns the following code
986 -- Bn : Index_T := B'First (N);
990 -- exit when An = A'Last (N);
991 -- An := Index_T'Succ (An)
992 -- Bn := Index_T'Succ (Bn)
996 -- If both indices are constrained and identical, the procedure
997 -- returns a simpler loop:
999 -- for An in A'Range (N) loop
1003 -- N is the dimension for which we are generating a loop. Index is the
1004 -- N'th index node, whose Etype is Index_Type_n in the above code.
1005 -- The xxx statement is either the loop or declare for the next
1006 -- dimension or if this is the last dimension the comparison
1007 -- of corresponding components of the arrays.
1009 -- The actual way the code works is to return the comparison
1010 -- of corresponding components for the N+1 call. That's neater!
1012 function Test_Empty_Arrays
return Node_Id
;
1013 -- This function constructs the test for both arrays being empty
1014 -- (A'length (1) = 0 or else A'length (2) = 0 or else ...)
1016 -- (B'length (1) = 0 or else B'length (2) = 0 or else ...)
1018 function Test_Lengths_Correspond
return Node_Id
;
1019 -- This function constructs the test for arrays having different
1020 -- lengths in at least one index position, in which case resull
1022 -- A'length (1) /= B'length (1)
1024 -- A'length (2) /= B'length (2)
1035 Num
: Int
) return Node_Id
1039 Make_Attribute_Reference
(Loc
,
1040 Attribute_Name
=> Nam
,
1041 Prefix
=> New_Reference_To
(Arr
, Loc
),
1042 Expressions
=> New_List
(Make_Integer_Literal
(Loc
, Num
)));
1045 ------------------------
1046 -- Component_Equality --
1047 ------------------------
1049 function Component_Equality
(Typ
: Entity_Id
) return Node_Id
is
1054 -- if a(i1...) /= b(j1...) then return false; end if;
1057 Make_Indexed_Component
(Loc
,
1058 Prefix
=> Make_Identifier
(Loc
, Chars
(A
)),
1059 Expressions
=> Index_List1
);
1062 Make_Indexed_Component
(Loc
,
1063 Prefix
=> Make_Identifier
(Loc
, Chars
(B
)),
1064 Expressions
=> Index_List2
);
1066 Test
:= Expand_Composite_Equality
1067 (Nod
, Component_Type
(Typ
), L
, R
, Decls
);
1069 -- If some (sub)component is an unchecked_union, the whole operation
1070 -- will raise program error.
1072 if Nkind
(Test
) = N_Raise_Program_Error
then
1074 -- This node is going to be inserted at a location where a
1075 -- statement is expected: clear its Etype so analysis will
1076 -- set it to the expected Standard_Void_Type.
1078 Set_Etype
(Test
, Empty
);
1083 Make_Implicit_If_Statement
(Nod
,
1084 Condition
=> Make_Op_Not
(Loc
, Right_Opnd
=> Test
),
1085 Then_Statements
=> New_List
(
1086 Make_Return_Statement
(Loc
,
1087 Expression
=> New_Occurrence_Of
(Standard_False
, Loc
))));
1089 end Component_Equality
;
1095 function Get_Arg_Type
(N
: Node_Id
) return Entity_Id
is
1106 T
:= Underlying_Type
(T
);
1108 X
:= First_Index
(T
);
1109 while Present
(X
) loop
1110 if Denotes_Discriminant
(Type_Low_Bound
(Etype
(X
)))
1112 Denotes_Discriminant
(Type_High_Bound
(Etype
(X
)))
1125 --------------------------
1126 -- Handle_One_Dimension --
1127 ---------------------------
1129 function Handle_One_Dimension
1131 Index
: Node_Id
) return Node_Id
1133 Need_Separate_Indexes
: constant Boolean :=
1135 or else not Is_Constrained
(Ltyp
);
1136 -- If the index types are identical, and we are working with
1137 -- constrained types, then we can use the same index for both of
1140 An
: constant Entity_Id
:= Make_Defining_Identifier
(Loc
,
1141 Chars
=> New_Internal_Name
('A'));
1144 Index_T
: Entity_Id
;
1149 if N
> Number_Dimensions
(Ltyp
) then
1150 return Component_Equality
(Ltyp
);
1153 -- Case where we generate a loop
1155 Index_T
:= Base_Type
(Etype
(Index
));
1157 if Need_Separate_Indexes
then
1159 Make_Defining_Identifier
(Loc
,
1160 Chars
=> New_Internal_Name
('B'));
1165 Append
(New_Reference_To
(An
, Loc
), Index_List1
);
1166 Append
(New_Reference_To
(Bn
, Loc
), Index_List2
);
1168 Stm_List
:= New_List
(
1169 Handle_One_Dimension
(N
+ 1, Next_Index
(Index
)));
1171 if Need_Separate_Indexes
then
1173 -- Generate guard for loop, followed by increments of indices
1175 Append_To
(Stm_List
,
1176 Make_Exit_Statement
(Loc
,
1179 Left_Opnd
=> New_Reference_To
(An
, Loc
),
1180 Right_Opnd
=> Arr_Attr
(A
, Name_Last
, N
))));
1182 Append_To
(Stm_List
,
1183 Make_Assignment_Statement
(Loc
,
1184 Name
=> New_Reference_To
(An
, Loc
),
1186 Make_Attribute_Reference
(Loc
,
1187 Prefix
=> New_Reference_To
(Index_T
, Loc
),
1188 Attribute_Name
=> Name_Succ
,
1189 Expressions
=> New_List
(New_Reference_To
(An
, Loc
)))));
1191 Append_To
(Stm_List
,
1192 Make_Assignment_Statement
(Loc
,
1193 Name
=> New_Reference_To
(Bn
, Loc
),
1195 Make_Attribute_Reference
(Loc
,
1196 Prefix
=> New_Reference_To
(Index_T
, Loc
),
1197 Attribute_Name
=> Name_Succ
,
1198 Expressions
=> New_List
(New_Reference_To
(Bn
, Loc
)))));
1201 -- If separate indexes, we need a declare block for An and Bn, and a
1202 -- loop without an iteration scheme.
1204 if Need_Separate_Indexes
then
1206 Make_Implicit_Loop_Statement
(Nod
, Statements
=> Stm_List
);
1209 Make_Block_Statement
(Loc
,
1210 Declarations
=> New_List
(
1211 Make_Object_Declaration
(Loc
,
1212 Defining_Identifier
=> An
,
1213 Object_Definition
=> New_Reference_To
(Index_T
, Loc
),
1214 Expression
=> Arr_Attr
(A
, Name_First
, N
)),
1216 Make_Object_Declaration
(Loc
,
1217 Defining_Identifier
=> Bn
,
1218 Object_Definition
=> New_Reference_To
(Index_T
, Loc
),
1219 Expression
=> Arr_Attr
(B
, Name_First
, N
))),
1221 Handled_Statement_Sequence
=>
1222 Make_Handled_Sequence_Of_Statements
(Loc
,
1223 Statements
=> New_List
(Loop_Stm
)));
1225 -- If no separate indexes, return loop statement with explicit
1226 -- iteration scheme on its own
1230 Make_Implicit_Loop_Statement
(Nod
,
1231 Statements
=> Stm_List
,
1233 Make_Iteration_Scheme
(Loc
,
1234 Loop_Parameter_Specification
=>
1235 Make_Loop_Parameter_Specification
(Loc
,
1236 Defining_Identifier
=> An
,
1237 Discrete_Subtype_Definition
=>
1238 Arr_Attr
(A
, Name_Range
, N
))));
1241 end Handle_One_Dimension
;
1243 -----------------------
1244 -- Test_Empty_Arrays --
1245 -----------------------
1247 function Test_Empty_Arrays
return Node_Id
is
1257 for J
in 1 .. Number_Dimensions
(Ltyp
) loop
1260 Left_Opnd
=> Arr_Attr
(A
, Name_Length
, J
),
1261 Right_Opnd
=> Make_Integer_Literal
(Loc
, 0));
1265 Left_Opnd
=> Arr_Attr
(B
, Name_Length
, J
),
1266 Right_Opnd
=> Make_Integer_Literal
(Loc
, 0));
1275 Left_Opnd
=> Relocate_Node
(Alist
),
1276 Right_Opnd
=> Atest
);
1280 Left_Opnd
=> Relocate_Node
(Blist
),
1281 Right_Opnd
=> Btest
);
1288 Right_Opnd
=> Blist
);
1289 end Test_Empty_Arrays
;
1291 -----------------------------
1292 -- Test_Lengths_Correspond --
1293 -----------------------------
1295 function Test_Lengths_Correspond
return Node_Id
is
1301 for J
in 1 .. Number_Dimensions
(Ltyp
) loop
1304 Left_Opnd
=> Arr_Attr
(A
, Name_Length
, J
),
1305 Right_Opnd
=> Arr_Attr
(B
, Name_Length
, J
));
1312 Left_Opnd
=> Relocate_Node
(Result
),
1313 Right_Opnd
=> Rtest
);
1318 end Test_Lengths_Correspond
;
1320 -- Start of processing for Expand_Array_Equality
1323 Ltyp
:= Get_Arg_Type
(Lhs
);
1324 Rtyp
:= Get_Arg_Type
(Rhs
);
1326 -- For now, if the argument types are not the same, go to the
1327 -- base type, since the code assumes that the formals have the
1328 -- same type. This is fixable in future ???
1330 if Ltyp
/= Rtyp
then
1331 Ltyp
:= Base_Type
(Ltyp
);
1332 Rtyp
:= Base_Type
(Rtyp
);
1333 pragma Assert
(Ltyp
= Rtyp
);
1336 -- Build list of formals for function
1338 Formals
:= New_List
(
1339 Make_Parameter_Specification
(Loc
,
1340 Defining_Identifier
=> A
,
1341 Parameter_Type
=> New_Reference_To
(Ltyp
, Loc
)),
1343 Make_Parameter_Specification
(Loc
,
1344 Defining_Identifier
=> B
,
1345 Parameter_Type
=> New_Reference_To
(Rtyp
, Loc
)));
1347 Func_Name
:= Make_Defining_Identifier
(Loc
, New_Internal_Name
('E'));
1349 -- Build statement sequence for function
1352 Make_Subprogram_Body
(Loc
,
1354 Make_Function_Specification
(Loc
,
1355 Defining_Unit_Name
=> Func_Name
,
1356 Parameter_Specifications
=> Formals
,
1357 Subtype_Mark
=> New_Reference_To
(Standard_Boolean
, Loc
)),
1359 Declarations
=> Decls
,
1361 Handled_Statement_Sequence
=>
1362 Make_Handled_Sequence_Of_Statements
(Loc
,
1363 Statements
=> New_List
(
1365 Make_Implicit_If_Statement
(Nod
,
1366 Condition
=> Test_Empty_Arrays
,
1367 Then_Statements
=> New_List
(
1368 Make_Return_Statement
(Loc
,
1370 New_Occurrence_Of
(Standard_True
, Loc
)))),
1372 Make_Implicit_If_Statement
(Nod
,
1373 Condition
=> Test_Lengths_Correspond
,
1374 Then_Statements
=> New_List
(
1375 Make_Return_Statement
(Loc
,
1377 New_Occurrence_Of
(Standard_False
, Loc
)))),
1379 Handle_One_Dimension
(1, First_Index
(Ltyp
)),
1381 Make_Return_Statement
(Loc
,
1382 Expression
=> New_Occurrence_Of
(Standard_True
, Loc
)))));
1384 Set_Has_Completion
(Func_Name
, True);
1385 Set_Is_Inlined
(Func_Name
);
1387 -- If the array type is distinct from the type of the arguments,
1388 -- it is the full view of a private type. Apply an unchecked
1389 -- conversion to insure that analysis of the call succeeds.
1399 or else Base_Type
(Etype
(Lhs
)) /= Base_Type
(Ltyp
)
1401 L
:= OK_Convert_To
(Ltyp
, Lhs
);
1405 or else Base_Type
(Etype
(Rhs
)) /= Base_Type
(Rtyp
)
1407 R
:= OK_Convert_To
(Rtyp
, Rhs
);
1410 Actuals
:= New_List
(L
, R
);
1413 Append_To
(Bodies
, Func_Body
);
1416 Make_Function_Call
(Loc
,
1417 Name
=> New_Reference_To
(Func_Name
, Loc
),
1418 Parameter_Associations
=> Actuals
);
1419 end Expand_Array_Equality
;
1421 -----------------------------
1422 -- Expand_Boolean_Operator --
1423 -----------------------------
1425 -- Note that we first get the actual subtypes of the operands,
1426 -- since we always want to deal with types that have bounds.
1428 procedure Expand_Boolean_Operator
(N
: Node_Id
) is
1429 Typ
: constant Entity_Id
:= Etype
(N
);
1432 -- Special case of bit packed array where both operands are known
1433 -- to be properly aligned. In this case we use an efficient run time
1434 -- routine to carry out the operation (see System.Bit_Ops).
1436 if Is_Bit_Packed_Array
(Typ
)
1437 and then not Is_Possibly_Unaligned_Object
(Left_Opnd
(N
))
1438 and then not Is_Possibly_Unaligned_Object
(Right_Opnd
(N
))
1440 Expand_Packed_Boolean_Operator
(N
);
1444 -- For the normal non-packed case, the general expansion is to build
1445 -- function for carrying out the comparison (use Make_Boolean_Array_Op)
1446 -- and then inserting it into the tree. The original operator node is
1447 -- then rewritten as a call to this function. We also use this in the
1448 -- packed case if either operand is a possibly unaligned object.
1451 Loc
: constant Source_Ptr
:= Sloc
(N
);
1452 L
: constant Node_Id
:= Relocate_Node
(Left_Opnd
(N
));
1453 R
: constant Node_Id
:= Relocate_Node
(Right_Opnd
(N
));
1454 Func_Body
: Node_Id
;
1455 Func_Name
: Entity_Id
;
1458 Convert_To_Actual_Subtype
(L
);
1459 Convert_To_Actual_Subtype
(R
);
1460 Ensure_Defined
(Etype
(L
), N
);
1461 Ensure_Defined
(Etype
(R
), N
);
1462 Apply_Length_Check
(R
, Etype
(L
));
1464 if Nkind
(Parent
(N
)) = N_Assignment_Statement
1465 and then Safe_In_Place_Array_Op
(Name
(Parent
(N
)), L
, R
)
1467 Build_Boolean_Array_Proc_Call
(Parent
(N
), L
, R
);
1469 elsif Nkind
(Parent
(N
)) = N_Op_Not
1470 and then Nkind
(N
) = N_Op_And
1472 Safe_In_Place_Array_Op
(Name
(Parent
(Parent
(N
))), L
, R
)
1477 Func_Body
:= Make_Boolean_Array_Op
(Etype
(L
), N
);
1478 Func_Name
:= Defining_Unit_Name
(Specification
(Func_Body
));
1479 Insert_Action
(N
, Func_Body
);
1481 -- Now rewrite the expression with a call
1484 Make_Function_Call
(Loc
,
1485 Name
=> New_Reference_To
(Func_Name
, Loc
),
1486 Parameter_Associations
=>
1489 Make_Type_Conversion
1490 (Loc
, New_Reference_To
(Etype
(L
), Loc
), R
))));
1492 Analyze_And_Resolve
(N
, Typ
);
1495 end Expand_Boolean_Operator
;
1497 -------------------------------
1498 -- Expand_Composite_Equality --
1499 -------------------------------
1501 -- This function is only called for comparing internal fields of composite
1502 -- types when these fields are themselves composites. This is a special
1503 -- case because it is not possible to respect normal Ada visibility rules.
1505 function Expand_Composite_Equality
1510 Bodies
: List_Id
) return Node_Id
1512 Loc
: constant Source_Ptr
:= Sloc
(Nod
);
1513 Full_Type
: Entity_Id
;
1518 if Is_Private_Type
(Typ
) then
1519 Full_Type
:= Underlying_Type
(Typ
);
1524 -- Defense against malformed private types with no completion
1525 -- the error will be diagnosed later by check_completion
1527 if No
(Full_Type
) then
1528 return New_Reference_To
(Standard_False
, Loc
);
1531 Full_Type
:= Base_Type
(Full_Type
);
1533 if Is_Array_Type
(Full_Type
) then
1535 -- If the operand is an elementary type other than a floating-point
1536 -- type, then we can simply use the built-in block bitwise equality,
1537 -- since the predefined equality operators always apply and bitwise
1538 -- equality is fine for all these cases.
1540 if Is_Elementary_Type
(Component_Type
(Full_Type
))
1541 and then not Is_Floating_Point_Type
(Component_Type
(Full_Type
))
1543 return Make_Op_Eq
(Loc
, Left_Opnd
=> Lhs
, Right_Opnd
=> Rhs
);
1545 -- For composite component types, and floating-point types, use
1546 -- the expansion. This deals with tagged component types (where
1547 -- we use the applicable equality routine) and floating-point,
1548 -- (where we need to worry about negative zeroes), and also the
1549 -- case of any composite type recursively containing such fields.
1552 return Expand_Array_Equality
(Nod
, Lhs
, Rhs
, Bodies
, Full_Type
);
1555 elsif Is_Tagged_Type
(Full_Type
) then
1557 -- Call the primitive operation "=" of this type
1559 if Is_Class_Wide_Type
(Full_Type
) then
1560 Full_Type
:= Root_Type
(Full_Type
);
1563 -- If this is derived from an untagged private type completed
1564 -- with a tagged type, it does not have a full view, so we
1565 -- use the primitive operations of the private type.
1566 -- This check should no longer be necessary when these
1567 -- types receive their full views ???
1569 if Is_Private_Type
(Typ
)
1570 and then not Is_Tagged_Type
(Typ
)
1571 and then not Is_Controlled
(Typ
)
1572 and then Is_Derived_Type
(Typ
)
1573 and then No
(Full_View
(Typ
))
1575 Prim
:= First_Elmt
(Collect_Primitive_Operations
(Typ
));
1577 Prim
:= First_Elmt
(Primitive_Operations
(Full_Type
));
1581 Eq_Op
:= Node
(Prim
);
1582 exit when Chars
(Eq_Op
) = Name_Op_Eq
1583 and then Etype
(First_Formal
(Eq_Op
)) =
1584 Etype
(Next_Formal
(First_Formal
(Eq_Op
)))
1585 and then Base_Type
(Etype
(Eq_Op
)) = Standard_Boolean
;
1587 pragma Assert
(Present
(Prim
));
1590 Eq_Op
:= Node
(Prim
);
1593 Make_Function_Call
(Loc
,
1594 Name
=> New_Reference_To
(Eq_Op
, Loc
),
1595 Parameter_Associations
=>
1597 (Unchecked_Convert_To
(Etype
(First_Formal
(Eq_Op
)), Lhs
),
1598 Unchecked_Convert_To
(Etype
(First_Formal
(Eq_Op
)), Rhs
)));
1600 elsif Is_Record_Type
(Full_Type
) then
1601 Eq_Op
:= TSS
(Full_Type
, TSS_Composite_Equality
);
1603 if Present
(Eq_Op
) then
1604 if Etype
(First_Formal
(Eq_Op
)) /= Full_Type
then
1606 -- Inherited equality from parent type. Convert the actuals
1607 -- to match signature of operation.
1610 T
: constant Entity_Id
:= Etype
(First_Formal
(Eq_Op
));
1614 Make_Function_Call
(Loc
,
1615 Name
=> New_Reference_To
(Eq_Op
, Loc
),
1616 Parameter_Associations
=>
1617 New_List
(OK_Convert_To
(T
, Lhs
),
1618 OK_Convert_To
(T
, Rhs
)));
1622 -- Comparison between Unchecked_Union components
1624 if Is_Unchecked_Union
(Full_Type
) then
1626 Lhs_Type
: Node_Id
:= Full_Type
;
1627 Rhs_Type
: Node_Id
:= Full_Type
;
1628 Lhs_Discr_Val
: Node_Id
;
1629 Rhs_Discr_Val
: Node_Id
;
1634 if Nkind
(Lhs
) = N_Selected_Component
then
1635 Lhs_Type
:= Etype
(Entity
(Selector_Name
(Lhs
)));
1640 if Nkind
(Rhs
) = N_Selected_Component
then
1641 Rhs_Type
:= Etype
(Entity
(Selector_Name
(Rhs
)));
1644 -- Lhs of the composite equality
1646 if Is_Constrained
(Lhs_Type
) then
1648 -- Since the enclosing record can never be an
1649 -- Unchecked_Union (this code is executed for records
1650 -- that do not have variants), we may reference its
1653 if Nkind
(Lhs
) = N_Selected_Component
1654 and then Has_Per_Object_Constraint
(
1655 Entity
(Selector_Name
(Lhs
)))
1658 Make_Selected_Component
(Loc
,
1659 Prefix
=> Prefix
(Lhs
),
1662 Get_Discriminant_Value
(
1663 First_Discriminant
(Lhs_Type
),
1665 Stored_Constraint
(Lhs_Type
))));
1668 Lhs_Discr_Val
:= New_Copy
(
1669 Get_Discriminant_Value
(
1670 First_Discriminant
(Lhs_Type
),
1672 Stored_Constraint
(Lhs_Type
)));
1676 -- It is not possible to infer the discriminant since
1677 -- the subtype is not constrained.
1680 Make_Raise_Program_Error
(Loc
,
1681 Reason
=> PE_Unchecked_Union_Restriction
);
1684 -- Rhs of the composite equality
1686 if Is_Constrained
(Rhs_Type
) then
1687 if Nkind
(Rhs
) = N_Selected_Component
1688 and then Has_Per_Object_Constraint
(
1689 Entity
(Selector_Name
(Rhs
)))
1692 Make_Selected_Component
(Loc
,
1693 Prefix
=> Prefix
(Rhs
),
1696 Get_Discriminant_Value
(
1697 First_Discriminant
(Rhs_Type
),
1699 Stored_Constraint
(Rhs_Type
))));
1702 Rhs_Discr_Val
:= New_Copy
(
1703 Get_Discriminant_Value
(
1704 First_Discriminant
(Rhs_Type
),
1706 Stored_Constraint
(Rhs_Type
)));
1711 Make_Raise_Program_Error
(Loc
,
1712 Reason
=> PE_Unchecked_Union_Restriction
);
1715 -- Call the TSS equality function with the inferred
1716 -- discriminant values.
1719 Make_Function_Call
(Loc
,
1720 Name
=> New_Reference_To
(Eq_Op
, Loc
),
1721 Parameter_Associations
=> New_List
(
1729 -- Shouldn't this be an else, we can't fall through
1730 -- the above IF, right???
1733 Make_Function_Call
(Loc
,
1734 Name
=> New_Reference_To
(Eq_Op
, Loc
),
1735 Parameter_Associations
=> New_List
(Lhs
, Rhs
));
1739 return Expand_Record_Equality
(Nod
, Full_Type
, Lhs
, Rhs
, Bodies
);
1743 -- It can be a simple record or the full view of a scalar private
1745 return Make_Op_Eq
(Loc
, Left_Opnd
=> Lhs
, Right_Opnd
=> Rhs
);
1747 end Expand_Composite_Equality
;
1749 ------------------------------
1750 -- Expand_Concatenate_Other --
1751 ------------------------------
1753 -- Let n be the number of array operands to be concatenated, Base_Typ
1754 -- their base type, Ind_Typ their index type, and Arr_Typ the original
1755 -- array type to which the concatenantion operator applies, then the
1756 -- following subprogram is constructed:
1758 -- [function Cnn (S1 : Base_Typ; ...; Sn : Base_Typ) return Base_Typ is
1761 -- if S1'Length /= 0 then
1762 -- L := XXX; --> XXX = S1'First if Arr_Typ is unconstrained
1763 -- XXX = Arr_Typ'First otherwise
1764 -- elsif S2'Length /= 0 then
1765 -- L := YYY; --> YYY = S2'First if Arr_Typ is unconstrained
1766 -- YYY = Arr_Typ'First otherwise
1768 -- elsif Sn-1'Length /= 0 then
1769 -- L := ZZZ; --> ZZZ = Sn-1'First if Arr_Typ is unconstrained
1770 -- ZZZ = Arr_Typ'First otherwise
1778 -- Ind_Typ'Val ((((S1'Length - 1) + S2'Length) + ... + Sn'Length)
1779 -- + Ind_Typ'Pos (L));
1780 -- R : Base_Typ (L .. H);
1782 -- if S1'Length /= 0 then
1786 -- L := Ind_Typ'Succ (L);
1787 -- exit when P = S1'Last;
1788 -- P := Ind_Typ'Succ (P);
1792 -- if S2'Length /= 0 then
1793 -- L := Ind_Typ'Succ (L);
1796 -- L := Ind_Typ'Succ (L);
1797 -- exit when P = S2'Last;
1798 -- P := Ind_Typ'Succ (P);
1804 -- if Sn'Length /= 0 then
1808 -- L := Ind_Typ'Succ (L);
1809 -- exit when P = Sn'Last;
1810 -- P := Ind_Typ'Succ (P);
1818 procedure Expand_Concatenate_Other
(Cnode
: Node_Id
; Opnds
: List_Id
) is
1819 Loc
: constant Source_Ptr
:= Sloc
(Cnode
);
1820 Nb_Opnds
: constant Nat
:= List_Length
(Opnds
);
1822 Arr_Typ
: constant Entity_Id
:= Etype
(Entity
(Cnode
));
1823 Base_Typ
: constant Entity_Id
:= Base_Type
(Etype
(Cnode
));
1824 Ind_Typ
: constant Entity_Id
:= Etype
(First_Index
(Base_Typ
));
1827 Func_Spec
: Node_Id
;
1828 Param_Specs
: List_Id
;
1830 Func_Body
: Node_Id
;
1831 Func_Decls
: List_Id
;
1832 Func_Stmts
: List_Id
;
1837 Elsif_List
: List_Id
;
1839 Declare_Block
: Node_Id
;
1840 Declare_Decls
: List_Id
;
1841 Declare_Stmts
: List_Id
;
1853 function Copy_Into_R_S
(I
: Nat
; Last
: Boolean) return List_Id
;
1854 -- Builds the sequence of statement:
1858 -- L := Ind_Typ'Succ (L);
1859 -- exit when P = Si'Last;
1860 -- P := Ind_Typ'Succ (P);
1863 -- where i is the input parameter I given.
1864 -- If the flag Last is true, the exit statement is emitted before
1865 -- incrementing the lower bound, to prevent the creation out of
1868 function Init_L
(I
: Nat
) return Node_Id
;
1869 -- Builds the statement:
1870 -- L := Arr_Typ'First; If Arr_Typ is constrained
1871 -- L := Si'First; otherwise (where I is the input param given)
1873 function H
return Node_Id
;
1874 -- Builds reference to identifier H
1876 function Ind_Val
(E
: Node_Id
) return Node_Id
;
1877 -- Builds expression Ind_Typ'Val (E);
1879 function L
return Node_Id
;
1880 -- Builds reference to identifier L
1882 function L_Pos
return Node_Id
;
1883 -- Builds expression Integer_Type'(Ind_Typ'Pos (L)). We qualify the
1884 -- expression to avoid universal_integer computations whenever possible,
1885 -- in the expression for the upper bound H.
1887 function L_Succ
return Node_Id
;
1888 -- Builds expression Ind_Typ'Succ (L)
1890 function One
return Node_Id
;
1891 -- Builds integer literal one
1893 function P
return Node_Id
;
1894 -- Builds reference to identifier P
1896 function P_Succ
return Node_Id
;
1897 -- Builds expression Ind_Typ'Succ (P)
1899 function R
return Node_Id
;
1900 -- Builds reference to identifier R
1902 function S
(I
: Nat
) return Node_Id
;
1903 -- Builds reference to identifier Si, where I is the value given
1905 function S_First
(I
: Nat
) return Node_Id
;
1906 -- Builds expression Si'First, where I is the value given
1908 function S_Last
(I
: Nat
) return Node_Id
;
1909 -- Builds expression Si'Last, where I is the value given
1911 function S_Length
(I
: Nat
) return Node_Id
;
1912 -- Builds expression Si'Length, where I is the value given
1914 function S_Length_Test
(I
: Nat
) return Node_Id
;
1915 -- Builds expression Si'Length /= 0, where I is the value given
1921 function Copy_Into_R_S
(I
: Nat
; Last
: Boolean) return List_Id
is
1922 Stmts
: constant List_Id
:= New_List
;
1924 Loop_Stmt
: Node_Id
;
1926 Exit_Stmt
: Node_Id
;
1931 -- First construct the initializations
1933 P_Start
:= Make_Assignment_Statement
(Loc
,
1935 Expression
=> S_First
(I
));
1936 Append_To
(Stmts
, P_Start
);
1938 -- Then build the loop
1940 R_Copy
:= Make_Assignment_Statement
(Loc
,
1941 Name
=> Make_Indexed_Component
(Loc
,
1943 Expressions
=> New_List
(L
)),
1944 Expression
=> Make_Indexed_Component
(Loc
,
1946 Expressions
=> New_List
(P
)));
1948 L_Inc
:= Make_Assignment_Statement
(Loc
,
1950 Expression
=> L_Succ
);
1952 Exit_Stmt
:= Make_Exit_Statement
(Loc
,
1953 Condition
=> Make_Op_Eq
(Loc
, P
, S_Last
(I
)));
1955 P_Inc
:= Make_Assignment_Statement
(Loc
,
1957 Expression
=> P_Succ
);
1961 Make_Implicit_Loop_Statement
(Cnode
,
1962 Statements
=> New_List
(R_Copy
, Exit_Stmt
, L_Inc
, P_Inc
));
1965 Make_Implicit_Loop_Statement
(Cnode
,
1966 Statements
=> New_List
(R_Copy
, L_Inc
, Exit_Stmt
, P_Inc
));
1969 Append_To
(Stmts
, Loop_Stmt
);
1978 function H
return Node_Id
is
1980 return Make_Identifier
(Loc
, Name_uH
);
1987 function Ind_Val
(E
: Node_Id
) return Node_Id
is
1990 Make_Attribute_Reference
(Loc
,
1991 Prefix
=> New_Reference_To
(Ind_Typ
, Loc
),
1992 Attribute_Name
=> Name_Val
,
1993 Expressions
=> New_List
(E
));
2000 function Init_L
(I
: Nat
) return Node_Id
is
2004 if Is_Constrained
(Arr_Typ
) then
2005 E
:= Make_Attribute_Reference
(Loc
,
2006 Prefix
=> New_Reference_To
(Arr_Typ
, Loc
),
2007 Attribute_Name
=> Name_First
);
2013 return Make_Assignment_Statement
(Loc
, Name
=> L
, Expression
=> E
);
2020 function L
return Node_Id
is
2022 return Make_Identifier
(Loc
, Name_uL
);
2029 function L_Pos
return Node_Id
is
2030 Target_Type
: Entity_Id
;
2033 -- If the index type is an enumeration type, the computation
2034 -- can be done in standard integer. Otherwise, choose a large
2035 -- enough integer type.
2037 if Is_Enumeration_Type
(Ind_Typ
)
2038 or else Root_Type
(Ind_Typ
) = Standard_Integer
2039 or else Root_Type
(Ind_Typ
) = Standard_Short_Integer
2040 or else Root_Type
(Ind_Typ
) = Standard_Short_Short_Integer
2042 Target_Type
:= Standard_Integer
;
2044 Target_Type
:= Root_Type
(Ind_Typ
);
2048 Make_Qualified_Expression
(Loc
,
2049 Subtype_Mark
=> New_Reference_To
(Target_Type
, Loc
),
2051 Make_Attribute_Reference
(Loc
,
2052 Prefix
=> New_Reference_To
(Ind_Typ
, Loc
),
2053 Attribute_Name
=> Name_Pos
,
2054 Expressions
=> New_List
(L
)));
2061 function L_Succ
return Node_Id
is
2064 Make_Attribute_Reference
(Loc
,
2065 Prefix
=> New_Reference_To
(Ind_Typ
, Loc
),
2066 Attribute_Name
=> Name_Succ
,
2067 Expressions
=> New_List
(L
));
2074 function One
return Node_Id
is
2076 return Make_Integer_Literal
(Loc
, 1);
2083 function P
return Node_Id
is
2085 return Make_Identifier
(Loc
, Name_uP
);
2092 function P_Succ
return Node_Id
is
2095 Make_Attribute_Reference
(Loc
,
2096 Prefix
=> New_Reference_To
(Ind_Typ
, Loc
),
2097 Attribute_Name
=> Name_Succ
,
2098 Expressions
=> New_List
(P
));
2105 function R
return Node_Id
is
2107 return Make_Identifier
(Loc
, Name_uR
);
2114 function S
(I
: Nat
) return Node_Id
is
2116 return Make_Identifier
(Loc
, New_External_Name
('S', I
));
2123 function S_First
(I
: Nat
) return Node_Id
is
2125 return Make_Attribute_Reference
(Loc
,
2127 Attribute_Name
=> Name_First
);
2134 function S_Last
(I
: Nat
) return Node_Id
is
2136 return Make_Attribute_Reference
(Loc
,
2138 Attribute_Name
=> Name_Last
);
2145 function S_Length
(I
: Nat
) return Node_Id
is
2147 return Make_Attribute_Reference
(Loc
,
2149 Attribute_Name
=> Name_Length
);
2156 function S_Length_Test
(I
: Nat
) return Node_Id
is
2160 Left_Opnd
=> S_Length
(I
),
2161 Right_Opnd
=> Make_Integer_Literal
(Loc
, 0));
2164 -- Start of processing for Expand_Concatenate_Other
2167 -- Construct the parameter specs and the overall function spec
2169 Param_Specs
:= New_List
;
2170 for I
in 1 .. Nb_Opnds
loop
2173 Make_Parameter_Specification
(Loc
,
2174 Defining_Identifier
=>
2175 Make_Defining_Identifier
(Loc
, New_External_Name
('S', I
)),
2176 Parameter_Type
=> New_Reference_To
(Base_Typ
, Loc
)));
2179 Func_Id
:= Make_Defining_Identifier
(Loc
, New_Internal_Name
('C'));
2181 Make_Function_Specification
(Loc
,
2182 Defining_Unit_Name
=> Func_Id
,
2183 Parameter_Specifications
=> Param_Specs
,
2184 Subtype_Mark
=> New_Reference_To
(Base_Typ
, Loc
));
2186 -- Construct L's object declaration
2189 Make_Object_Declaration
(Loc
,
2190 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_uL
),
2191 Object_Definition
=> New_Reference_To
(Ind_Typ
, Loc
));
2193 Func_Decls
:= New_List
(L_Decl
);
2195 -- Construct the if-then-elsif statements
2197 Elsif_List
:= New_List
;
2198 for I
in 2 .. Nb_Opnds
- 1 loop
2199 Append_To
(Elsif_List
, Make_Elsif_Part
(Loc
,
2200 Condition
=> S_Length_Test
(I
),
2201 Then_Statements
=> New_List
(Init_L
(I
))));
2205 Make_Implicit_If_Statement
(Cnode
,
2206 Condition
=> S_Length_Test
(1),
2207 Then_Statements
=> New_List
(Init_L
(1)),
2208 Elsif_Parts
=> Elsif_List
,
2209 Else_Statements
=> New_List
(Make_Return_Statement
(Loc
,
2210 Expression
=> S
(Nb_Opnds
))));
2212 -- Construct the declaration for H
2215 Make_Object_Declaration
(Loc
,
2216 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_uP
),
2217 Object_Definition
=> New_Reference_To
(Ind_Typ
, Loc
));
2219 H_Init
:= Make_Op_Subtract
(Loc
, S_Length
(1), One
);
2220 for I
in 2 .. Nb_Opnds
loop
2221 H_Init
:= Make_Op_Add
(Loc
, H_Init
, S_Length
(I
));
2223 H_Init
:= Ind_Val
(Make_Op_Add
(Loc
, H_Init
, L_Pos
));
2226 Make_Object_Declaration
(Loc
,
2227 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_uH
),
2228 Object_Definition
=> New_Reference_To
(Ind_Typ
, Loc
),
2229 Expression
=> H_Init
);
2231 -- Construct the declaration for R
2233 R_Range
:= Make_Range
(Loc
, Low_Bound
=> L
, High_Bound
=> H
);
2235 Make_Index_Or_Discriminant_Constraint
(Loc
,
2236 Constraints
=> New_List
(R_Range
));
2239 Make_Object_Declaration
(Loc
,
2240 Defining_Identifier
=> Make_Defining_Identifier
(Loc
, Name_uR
),
2241 Object_Definition
=>
2242 Make_Subtype_Indication
(Loc
,
2243 Subtype_Mark
=> New_Reference_To
(Base_Typ
, Loc
),
2244 Constraint
=> R_Constr
));
2246 -- Construct the declarations for the declare block
2248 Declare_Decls
:= New_List
(P_Decl
, H_Decl
, R_Decl
);
2250 -- Construct list of statements for the declare block
2252 Declare_Stmts
:= New_List
;
2253 for I
in 1 .. Nb_Opnds
loop
2254 Append_To
(Declare_Stmts
,
2255 Make_Implicit_If_Statement
(Cnode
,
2256 Condition
=> S_Length_Test
(I
),
2257 Then_Statements
=> Copy_Into_R_S
(I
, I
= Nb_Opnds
)));
2260 Append_To
(Declare_Stmts
, Make_Return_Statement
(Loc
, Expression
=> R
));
2262 -- Construct the declare block
2264 Declare_Block
:= Make_Block_Statement
(Loc
,
2265 Declarations
=> Declare_Decls
,
2266 Handled_Statement_Sequence
=>
2267 Make_Handled_Sequence_Of_Statements
(Loc
, Declare_Stmts
));
2269 -- Construct the list of function statements
2271 Func_Stmts
:= New_List
(If_Stmt
, Declare_Block
);
2273 -- Construct the function body
2276 Make_Subprogram_Body
(Loc
,
2277 Specification
=> Func_Spec
,
2278 Declarations
=> Func_Decls
,
2279 Handled_Statement_Sequence
=>
2280 Make_Handled_Sequence_Of_Statements
(Loc
, Func_Stmts
));
2282 -- Insert the newly generated function in the code. This is analyzed
2283 -- with all checks off, since we have completed all the checks.
2285 -- Note that this does *not* fix the array concatenation bug when the
2286 -- low bound is Integer'first sibce that bug comes from the pointer
2287 -- dereferencing an unconstrained array. An there we need a constraint
2288 -- check to make sure the length of the concatenated array is ok. ???
2290 Insert_Action
(Cnode
, Func_Body
, Suppress
=> All_Checks
);
2292 -- Construct list of arguments for the function call
2295 Operand
:= First
(Opnds
);
2296 for I
in 1 .. Nb_Opnds
loop
2297 Append_To
(Params
, Relocate_Node
(Operand
));
2301 -- Insert the function call
2305 Make_Function_Call
(Loc
, New_Reference_To
(Func_Id
, Loc
), Params
));
2307 Analyze_And_Resolve
(Cnode
, Base_Typ
);
2308 Set_Is_Inlined
(Func_Id
);
2309 end Expand_Concatenate_Other
;
2311 -------------------------------
2312 -- Expand_Concatenate_String --
2313 -------------------------------
2315 procedure Expand_Concatenate_String
(Cnode
: Node_Id
; Opnds
: List_Id
) is
2316 Loc
: constant Source_Ptr
:= Sloc
(Cnode
);
2317 Opnd1
: constant Node_Id
:= First
(Opnds
);
2318 Opnd2
: constant Node_Id
:= Next
(Opnd1
);
2319 Typ1
: constant Entity_Id
:= Base_Type
(Etype
(Opnd1
));
2320 Typ2
: constant Entity_Id
:= Base_Type
(Etype
(Opnd2
));
2323 -- RE_Id value for function to be called
2326 -- In all cases, we build a call to a routine giving the list of
2327 -- arguments as the parameter list to the routine.
2329 case List_Length
(Opnds
) is
2331 if Typ1
= Standard_Character
then
2332 if Typ2
= Standard_Character
then
2333 R
:= RE_Str_Concat_CC
;
2336 pragma Assert
(Typ2
= Standard_String
);
2337 R
:= RE_Str_Concat_CS
;
2340 elsif Typ1
= Standard_String
then
2341 if Typ2
= Standard_Character
then
2342 R
:= RE_Str_Concat_SC
;
2345 pragma Assert
(Typ2
= Standard_String
);
2349 -- If we have anything other than Standard_Character or
2350 -- Standard_String, then we must have had a serious error
2351 -- earlier, so we just abandon the attempt at expansion.
2354 pragma Assert
(Serious_Errors_Detected
> 0);
2359 R
:= RE_Str_Concat_3
;
2362 R
:= RE_Str_Concat_4
;
2365 R
:= RE_Str_Concat_5
;
2369 raise Program_Error
;
2372 -- Now generate the appropriate call
2375 Make_Function_Call
(Sloc
(Cnode
),
2376 Name
=> New_Occurrence_Of
(RTE
(R
), Loc
),
2377 Parameter_Associations
=> Opnds
));
2379 Analyze_And_Resolve
(Cnode
, Standard_String
);
2382 when RE_Not_Available
=>
2384 end Expand_Concatenate_String
;
2386 ------------------------
2387 -- Expand_N_Allocator --
2388 ------------------------
2390 procedure Expand_N_Allocator
(N
: Node_Id
) is
2391 PtrT
: constant Entity_Id
:= Etype
(N
);
2392 Dtyp
: constant Entity_Id
:= Designated_Type
(PtrT
);
2394 Loc
: constant Source_Ptr
:= Sloc
(N
);
2399 -- RM E.2.3(22). We enforce that the expected type of an allocator
2400 -- shall not be a remote access-to-class-wide-limited-private type
2402 -- Why is this being done at expansion time, seems clearly wrong ???
2404 Validate_Remote_Access_To_Class_Wide_Type
(N
);
2406 -- Set the Storage Pool
2408 Set_Storage_Pool
(N
, Associated_Storage_Pool
(Root_Type
(PtrT
)));
2410 if Present
(Storage_Pool
(N
)) then
2411 if Is_RTE
(Storage_Pool
(N
), RE_SS_Pool
) then
2413 Set_Procedure_To_Call
(N
, RTE
(RE_SS_Allocate
));
2416 elsif Is_Class_Wide_Type
(Etype
(Storage_Pool
(N
))) then
2417 Set_Procedure_To_Call
(N
, RTE
(RE_Allocate_Any
));
2420 Set_Procedure_To_Call
(N
,
2421 Find_Prim_Op
(Etype
(Storage_Pool
(N
)), Name_Allocate
));
2425 -- Under certain circumstances we can replace an allocator by an
2426 -- access to statically allocated storage. The conditions, as noted
2427 -- in AARM 3.10 (10c) are as follows:
2429 -- Size and initial value is known at compile time
2430 -- Access type is access-to-constant
2432 -- The allocator is not part of a constraint on a record component,
2433 -- because in that case the inserted actions are delayed until the
2434 -- record declaration is fully analyzed, which is too late for the
2435 -- analysis of the rewritten allocator.
2437 if Is_Access_Constant
(PtrT
)
2438 and then Nkind
(Expression
(N
)) = N_Qualified_Expression
2439 and then Compile_Time_Known_Value
(Expression
(Expression
(N
)))
2440 and then Size_Known_At_Compile_Time
(Etype
(Expression
2442 and then not Is_Record_Type
(Current_Scope
)
2444 -- Here we can do the optimization. For the allocator
2448 -- We insert an object declaration
2450 -- Tnn : aliased x := y;
2452 -- and replace the allocator by Tnn'Unrestricted_Access.
2453 -- Tnn is marked as requiring static allocation.
2456 Make_Defining_Identifier
(Loc
, New_Internal_Name
('T'));
2458 Desig
:= Subtype_Mark
(Expression
(N
));
2460 -- If context is constrained, use constrained subtype directly,
2461 -- so that the constant is not labelled as having a nomimally
2462 -- unconstrained subtype.
2464 if Entity
(Desig
) = Base_Type
(Dtyp
) then
2465 Desig
:= New_Occurrence_Of
(Dtyp
, Loc
);
2469 Make_Object_Declaration
(Loc
,
2470 Defining_Identifier
=> Temp
,
2471 Aliased_Present
=> True,
2472 Constant_Present
=> Is_Access_Constant
(PtrT
),
2473 Object_Definition
=> Desig
,
2474 Expression
=> Expression
(Expression
(N
))));
2477 Make_Attribute_Reference
(Loc
,
2478 Prefix
=> New_Occurrence_Of
(Temp
, Loc
),
2479 Attribute_Name
=> Name_Unrestricted_Access
));
2481 Analyze_And_Resolve
(N
, PtrT
);
2483 -- We set the variable as statically allocated, since we don't
2484 -- want it going on the stack of the current procedure!
2486 Set_Is_Statically_Allocated
(Temp
);
2490 -- Handle case of qualified expression (other than optimization above)
2492 if Nkind
(Expression
(N
)) = N_Qualified_Expression
then
2493 Expand_Allocator_Expression
(N
);
2495 -- If the allocator is for a type which requires initialization, and
2496 -- there is no initial value (i.e. operand is a subtype indication
2497 -- rather than a qualifed expression), then we must generate a call
2498 -- to the initialization routine. This is done using an expression
2501 -- [Pnnn : constant ptr_T := new (T); Init (Pnnn.all,...); Pnnn]
2503 -- Here ptr_T is the pointer type for the allocator, and T is the
2504 -- subtype of the allocator. A special case arises if the designated
2505 -- type of the access type is a task or contains tasks. In this case
2506 -- the call to Init (Temp.all ...) is replaced by code that ensures
2507 -- that tasks get activated (see Exp_Ch9.Build_Task_Allocate_Block
2508 -- for details). In addition, if the type T is a task T, then the
2509 -- first argument to Init must be converted to the task record type.
2513 T
: constant Entity_Id
:= Entity
(Expression
(N
));
2521 Temp_Decl
: Node_Id
;
2522 Temp_Type
: Entity_Id
;
2523 Attach_Level
: Uint
;
2526 if No_Initialization
(N
) then
2529 -- Case of no initialization procedure present
2531 elsif not Has_Non_Null_Base_Init_Proc
(T
) then
2533 -- Case of simple initialization required
2535 if Needs_Simple_Initialization
(T
) then
2536 Rewrite
(Expression
(N
),
2537 Make_Qualified_Expression
(Loc
,
2538 Subtype_Mark
=> New_Occurrence_Of
(T
, Loc
),
2539 Expression
=> Get_Simple_Init_Val
(T
, Loc
)));
2541 Analyze_And_Resolve
(Expression
(Expression
(N
)), T
);
2542 Analyze_And_Resolve
(Expression
(N
), T
);
2543 Set_Paren_Count
(Expression
(Expression
(N
)), 1);
2544 Expand_N_Allocator
(N
);
2546 -- No initialization required
2552 -- Case of initialization procedure present, must be called
2555 Init
:= Base_Init_Proc
(T
);
2558 Make_Defining_Identifier
(Loc
, New_Internal_Name
('P'));
2560 -- Construct argument list for the initialization routine call
2561 -- The CPP constructor needs the address directly
2563 if Is_CPP_Class
(T
) then
2564 Arg1
:= New_Reference_To
(Temp
, Loc
);
2569 Make_Explicit_Dereference
(Loc
,
2570 Prefix
=> New_Reference_To
(Temp
, Loc
));
2571 Set_Assignment_OK
(Arg1
);
2574 -- The initialization procedure expects a specific type.
2575 -- if the context is access to class wide, indicate that
2576 -- the object being allocated has the right specific type.
2578 if Is_Class_Wide_Type
(Dtyp
) then
2579 Arg1
:= Unchecked_Convert_To
(T
, Arg1
);
2583 -- If designated type is a concurrent type or if it is a
2584 -- private type whose definition is a concurrent type,
2585 -- the first argument in the Init routine has to be
2586 -- unchecked conversion to the corresponding record type.
2587 -- If the designated type is a derived type, we also
2588 -- convert the argument to its root type.
2590 if Is_Concurrent_Type
(T
) then
2592 Unchecked_Convert_To
(Corresponding_Record_Type
(T
), Arg1
);
2594 elsif Is_Private_Type
(T
)
2595 and then Present
(Full_View
(T
))
2596 and then Is_Concurrent_Type
(Full_View
(T
))
2599 Unchecked_Convert_To
2600 (Corresponding_Record_Type
(Full_View
(T
)), Arg1
);
2602 elsif Etype
(First_Formal
(Init
)) /= Base_Type
(T
) then
2605 Ftyp
: constant Entity_Id
:= Etype
(First_Formal
(Init
));
2608 Arg1
:= OK_Convert_To
(Etype
(Ftyp
), Arg1
);
2609 Set_Etype
(Arg1
, Ftyp
);
2613 Args
:= New_List
(Arg1
);
2615 -- For the task case, pass the Master_Id of the access type
2616 -- as the value of the _Master parameter, and _Chain as the
2617 -- value of the _Chain parameter (_Chain will be defined as
2618 -- part of the generated code for the allocator).
2620 if Has_Task
(T
) then
2621 if No
(Master_Id
(Base_Type
(PtrT
))) then
2623 -- The designated type was an incomplete type, and
2624 -- the access type did not get expanded. Salvage
2627 Expand_N_Full_Type_Declaration
2628 (Parent
(Base_Type
(PtrT
)));
2631 -- If the context of the allocator is a declaration or
2632 -- an assignment, we can generate a meaningful image for
2633 -- it, even though subsequent assignments might remove
2634 -- the connection between task and entity. We build this
2635 -- image when the left-hand side is a simple variable,
2636 -- a simple indexed assignment or a simple selected
2639 if Nkind
(Parent
(N
)) = N_Assignment_Statement
then
2641 Nam
: constant Node_Id
:= Name
(Parent
(N
));
2644 if Is_Entity_Name
(Nam
) then
2646 Build_Task_Image_Decls
(
2649 (Entity
(Nam
), Sloc
(Nam
)), T
);
2651 elsif (Nkind
(Nam
) = N_Indexed_Component
2652 or else Nkind
(Nam
) = N_Selected_Component
)
2653 and then Is_Entity_Name
(Prefix
(Nam
))
2656 Build_Task_Image_Decls
2657 (Loc
, Nam
, Etype
(Prefix
(Nam
)));
2659 Decls
:= Build_Task_Image_Decls
(Loc
, T
, T
);
2663 elsif Nkind
(Parent
(N
)) = N_Object_Declaration
then
2665 Build_Task_Image_Decls
(
2666 Loc
, Defining_Identifier
(Parent
(N
)), T
);
2669 Decls
:= Build_Task_Image_Decls
(Loc
, T
, T
);
2674 (Master_Id
(Base_Type
(Root_Type
(PtrT
))), Loc
));
2675 Append_To
(Args
, Make_Identifier
(Loc
, Name_uChain
));
2677 Decl
:= Last
(Decls
);
2679 New_Occurrence_Of
(Defining_Identifier
(Decl
), Loc
));
2681 -- Has_Task is false, Decls not used
2687 -- Add discriminants if discriminated type
2689 if Has_Discriminants
(T
) then
2690 Discr
:= First_Elmt
(Discriminant_Constraint
(T
));
2692 while Present
(Discr
) loop
2693 Append
(New_Copy_Tree
(Elists
.Node
(Discr
)), Args
);
2697 elsif Is_Private_Type
(T
)
2698 and then Present
(Full_View
(T
))
2699 and then Has_Discriminants
(Full_View
(T
))
2702 First_Elmt
(Discriminant_Constraint
(Full_View
(T
)));
2704 while Present
(Discr
) loop
2705 Append
(New_Copy_Tree
(Elists
.Node
(Discr
)), Args
);
2710 -- We set the allocator as analyzed so that when we analyze the
2711 -- expression actions node, we do not get an unwanted recursive
2712 -- expansion of the allocator expression.
2714 Set_Analyzed
(N
, True);
2715 Node
:= Relocate_Node
(N
);
2717 -- Here is the transformation:
2719 -- output: Temp : constant ptr_T := new T;
2720 -- Init (Temp.all, ...);
2721 -- <CTRL> Attach_To_Final_List (Finalizable (Temp.all));
2722 -- <CTRL> Initialize (Finalizable (Temp.all));
2724 -- Here ptr_T is the pointer type for the allocator, and T
2725 -- is the subtype of the allocator.
2728 Make_Object_Declaration
(Loc
,
2729 Defining_Identifier
=> Temp
,
2730 Constant_Present
=> True,
2731 Object_Definition
=> New_Reference_To
(Temp_Type
, Loc
),
2732 Expression
=> Node
);
2734 Set_Assignment_OK
(Temp_Decl
);
2736 if Is_CPP_Class
(T
) then
2737 Set_Aliased_Present
(Temp_Decl
);
2740 Insert_Action
(N
, Temp_Decl
, Suppress
=> All_Checks
);
2742 -- If the designated type is task type or contains tasks,
2743 -- Create block to activate created tasks, and insert
2744 -- declaration for Task_Image variable ahead of call.
2746 if Has_Task
(T
) then
2748 L
: constant List_Id
:= New_List
;
2752 Build_Task_Allocate_Block
(L
, Node
, Args
);
2755 Insert_List_Before
(First
(Declarations
(Blk
)), Decls
);
2756 Insert_Actions
(N
, L
);
2761 Make_Procedure_Call_Statement
(Loc
,
2762 Name
=> New_Reference_To
(Init
, Loc
),
2763 Parameter_Associations
=> Args
));
2766 if Controlled_Type
(T
) then
2767 Flist
:= Get_Allocator_Final_List
(N
, Base_Type
(T
), PtrT
);
2768 if Ekind
(PtrT
) = E_Anonymous_Access_Type
then
2769 Attach_Level
:= Uint_1
;
2771 Attach_Level
:= Uint_2
;
2775 Ref
=> New_Copy_Tree
(Arg1
),
2778 With_Attach
=> Make_Integer_Literal
(Loc
,
2782 if Is_CPP_Class
(T
) then
2784 Make_Attribute_Reference
(Loc
,
2785 Prefix
=> New_Reference_To
(Temp
, Loc
),
2786 Attribute_Name
=> Name_Unchecked_Access
));
2788 Rewrite
(N
, New_Reference_To
(Temp
, Loc
));
2791 Analyze_And_Resolve
(N
, PtrT
);
2797 when RE_Not_Available
=>
2799 end Expand_N_Allocator
;
2801 -----------------------
2802 -- Expand_N_And_Then --
2803 -----------------------
2805 -- Expand into conditional expression if Actions present, and also
2806 -- deal with optimizing case of arguments being True or False.
2808 procedure Expand_N_And_Then
(N
: Node_Id
) is
2809 Loc
: constant Source_Ptr
:= Sloc
(N
);
2810 Typ
: constant Entity_Id
:= Etype
(N
);
2811 Left
: constant Node_Id
:= Left_Opnd
(N
);
2812 Right
: constant Node_Id
:= Right_Opnd
(N
);
2816 -- Deal with non-standard booleans
2818 if Is_Boolean_Type
(Typ
) then
2819 Adjust_Condition
(Left
);
2820 Adjust_Condition
(Right
);
2821 Set_Etype
(N
, Standard_Boolean
);
2824 -- Check for cases of left argument is True or False
2826 if Nkind
(Left
) = N_Identifier
then
2828 -- If left argument is True, change (True and then Right) to Right.
2829 -- Any actions associated with Right will be executed unconditionally
2830 -- and can thus be inserted into the tree unconditionally.
2832 if Entity
(Left
) = Standard_True
then
2833 if Present
(Actions
(N
)) then
2834 Insert_Actions
(N
, Actions
(N
));
2838 Adjust_Result_Type
(N
, Typ
);
2841 -- If left argument is False, change (False and then Right) to
2842 -- False. In this case we can forget the actions associated with
2843 -- Right, since they will never be executed.
2845 elsif Entity
(Left
) = Standard_False
then
2846 Kill_Dead_Code
(Right
);
2847 Kill_Dead_Code
(Actions
(N
));
2848 Rewrite
(N
, New_Occurrence_Of
(Standard_False
, Loc
));
2849 Adjust_Result_Type
(N
, Typ
);
2854 -- If Actions are present, we expand
2856 -- left and then right
2860 -- if left then right else false end
2862 -- with the actions becoming the Then_Actions of the conditional
2863 -- expression. This conditional expression is then further expanded
2864 -- (and will eventually disappear)
2866 if Present
(Actions
(N
)) then
2867 Actlist
:= Actions
(N
);
2869 Make_Conditional_Expression
(Loc
,
2870 Expressions
=> New_List
(
2873 New_Occurrence_Of
(Standard_False
, Loc
))));
2875 Set_Then_Actions
(N
, Actlist
);
2876 Analyze_And_Resolve
(N
, Standard_Boolean
);
2877 Adjust_Result_Type
(N
, Typ
);
2881 -- No actions present, check for cases of right argument True/False
2883 if Nkind
(Right
) = N_Identifier
then
2885 -- Change (Left and then True) to Left. Note that we know there
2886 -- are no actions associated with the True operand, since we
2887 -- just checked for this case above.
2889 if Entity
(Right
) = Standard_True
then
2892 -- Change (Left and then False) to False, making sure to preserve
2893 -- any side effects associated with the Left operand.
2895 elsif Entity
(Right
) = Standard_False
then
2896 Remove_Side_Effects
(Left
);
2898 (N
, New_Occurrence_Of
(Standard_False
, Loc
));
2902 Adjust_Result_Type
(N
, Typ
);
2903 end Expand_N_And_Then
;
2905 -------------------------------------
2906 -- Expand_N_Conditional_Expression --
2907 -------------------------------------
2909 -- Expand into expression actions if then/else actions present
2911 procedure Expand_N_Conditional_Expression
(N
: Node_Id
) is
2912 Loc
: constant Source_Ptr
:= Sloc
(N
);
2913 Cond
: constant Node_Id
:= First
(Expressions
(N
));
2914 Thenx
: constant Node_Id
:= Next
(Cond
);
2915 Elsex
: constant Node_Id
:= Next
(Thenx
);
2916 Typ
: constant Entity_Id
:= Etype
(N
);
2921 -- If either then or else actions are present, then given:
2923 -- if cond then then-expr else else-expr end
2925 -- we insert the following sequence of actions (using Insert_Actions):
2930 -- Cnn := then-expr;
2936 -- and replace the conditional expression by a reference to Cnn
2938 if Present
(Then_Actions
(N
)) or else Present
(Else_Actions
(N
)) then
2939 Cnn
:= Make_Defining_Identifier
(Loc
, New_Internal_Name
('C'));
2942 Make_Implicit_If_Statement
(N
,
2943 Condition
=> Relocate_Node
(Cond
),
2945 Then_Statements
=> New_List
(
2946 Make_Assignment_Statement
(Sloc
(Thenx
),
2947 Name
=> New_Occurrence_Of
(Cnn
, Sloc
(Thenx
)),
2948 Expression
=> Relocate_Node
(Thenx
))),
2950 Else_Statements
=> New_List
(
2951 Make_Assignment_Statement
(Sloc
(Elsex
),
2952 Name
=> New_Occurrence_Of
(Cnn
, Sloc
(Elsex
)),
2953 Expression
=> Relocate_Node
(Elsex
))));
2955 Set_Assignment_OK
(Name
(First
(Then_Statements
(New_If
))));
2956 Set_Assignment_OK
(Name
(First
(Else_Statements
(New_If
))));
2958 if Present
(Then_Actions
(N
)) then
2960 (First
(Then_Statements
(New_If
)), Then_Actions
(N
));
2963 if Present
(Else_Actions
(N
)) then
2965 (First
(Else_Statements
(New_If
)), Else_Actions
(N
));
2968 Rewrite
(N
, New_Occurrence_Of
(Cnn
, Loc
));
2971 Make_Object_Declaration
(Loc
,
2972 Defining_Identifier
=> Cnn
,
2973 Object_Definition
=> New_Occurrence_Of
(Typ
, Loc
)));
2975 Insert_Action
(N
, New_If
);
2976 Analyze_And_Resolve
(N
, Typ
);
2978 end Expand_N_Conditional_Expression
;
2980 -----------------------------------
2981 -- Expand_N_Explicit_Dereference --
2982 -----------------------------------
2984 procedure Expand_N_Explicit_Dereference
(N
: Node_Id
) is
2986 -- The only processing required is an insertion of an explicit
2987 -- dereference call for the checked storage pool case.
2989 Insert_Dereference_Action
(Prefix
(N
));
2990 end Expand_N_Explicit_Dereference
;
2996 procedure Expand_N_In
(N
: Node_Id
) is
2997 Loc
: constant Source_Ptr
:= Sloc
(N
);
2998 Rtyp
: constant Entity_Id
:= Etype
(N
);
2999 Lop
: constant Node_Id
:= Left_Opnd
(N
);
3000 Rop
: constant Node_Id
:= Right_Opnd
(N
);
3001 Static
: constant Boolean := Is_OK_Static_Expression
(N
);
3004 -- If we have an explicit range, do a bit of optimization based
3005 -- on range analysis (we may be able to kill one or both checks).
3007 if Nkind
(Rop
) = N_Range
then
3009 Lcheck
: constant Compare_Result
:=
3010 Compile_Time_Compare
(Lop
, Low_Bound
(Rop
));
3011 Ucheck
: constant Compare_Result
:=
3012 Compile_Time_Compare
(Lop
, High_Bound
(Rop
));
3015 -- If either check is known to fail, replace result
3016 -- by False, since the other check does not matter.
3017 -- Preserve the static flag for legality checks, because
3018 -- we are constant-folding beyond RM 4.9.
3020 if Lcheck
= LT
or else Ucheck
= GT
then
3022 New_Reference_To
(Standard_False
, Loc
));
3023 Analyze_And_Resolve
(N
, Rtyp
);
3024 Set_Is_Static_Expression
(N
, Static
);
3027 -- If both checks are known to succeed, replace result
3028 -- by True, since we know we are in range.
3030 elsif Lcheck
in Compare_GE
and then Ucheck
in Compare_LE
then
3032 New_Reference_To
(Standard_True
, Loc
));
3033 Analyze_And_Resolve
(N
, Rtyp
);
3034 Set_Is_Static_Expression
(N
, Static
);
3037 -- If lower bound check succeeds and upper bound check is
3038 -- not known to succeed or fail, then replace the range check
3039 -- with a comparison against the upper bound.
3041 elsif Lcheck
in Compare_GE
then
3045 Right_Opnd
=> High_Bound
(Rop
)));
3046 Analyze_And_Resolve
(N
, Rtyp
);
3049 -- If upper bound check succeeds and lower bound check is
3050 -- not known to succeed or fail, then replace the range check
3051 -- with a comparison against the lower bound.
3053 elsif Ucheck
in Compare_LE
then
3057 Right_Opnd
=> Low_Bound
(Rop
)));
3058 Analyze_And_Resolve
(N
, Rtyp
);
3063 -- For all other cases of an explicit range, nothing to be done
3067 -- Here right operand is a subtype mark
3071 Typ
: Entity_Id
:= Etype
(Rop
);
3072 Is_Acc
: constant Boolean := Is_Access_Type
(Typ
);
3073 Obj
: Node_Id
:= Lop
;
3074 Cond
: Node_Id
:= Empty
;
3077 Remove_Side_Effects
(Obj
);
3079 -- For tagged type, do tagged membership operation
3081 if Is_Tagged_Type
(Typ
) then
3083 -- No expansion will be performed when Java_VM, as the
3084 -- JVM back end will handle the membership tests directly
3085 -- (tags are not explicitly represented in Java objects,
3086 -- so the normal tagged membership expansion is not what
3090 Rewrite
(N
, Tagged_Membership
(N
));
3091 Analyze_And_Resolve
(N
, Rtyp
);
3096 -- If type is scalar type, rewrite as x in t'first .. t'last
3097 -- This reason we do this is that the bounds may have the wrong
3098 -- type if they come from the original type definition.
3100 elsif Is_Scalar_Type
(Typ
) then
3104 Make_Attribute_Reference
(Loc
,
3105 Attribute_Name
=> Name_First
,
3106 Prefix
=> New_Reference_To
(Typ
, Loc
)),
3109 Make_Attribute_Reference
(Loc
,
3110 Attribute_Name
=> Name_Last
,
3111 Prefix
=> New_Reference_To
(Typ
, Loc
))));
3112 Analyze_And_Resolve
(N
, Rtyp
);
3115 -- Ada 2005 (AI-216): Program_Error is raised when evaluating
3116 -- a membership test if the subtype mark denotes a constrained
3117 -- Unchecked_Union subtype and the expression lacks inferable
3120 elsif Is_Unchecked_Union
(Base_Type
(Typ
))
3121 and then Is_Constrained
(Typ
)
3122 and then not Has_Inferable_Discriminants
(Lop
)
3125 Make_Raise_Program_Error
(Loc
,
3126 Reason
=> PE_Unchecked_Union_Restriction
));
3128 -- Prevent Gigi from generating incorrect code by rewriting
3129 -- the test as a standard False.
3132 New_Occurrence_Of
(Standard_False
, Loc
));
3137 -- Here we have a non-scalar type
3140 Typ
:= Designated_Type
(Typ
);
3143 if not Is_Constrained
(Typ
) then
3145 New_Reference_To
(Standard_True
, Loc
));
3146 Analyze_And_Resolve
(N
, Rtyp
);
3148 -- For the constrained array case, we have to check the
3149 -- subscripts for an exact match if the lengths are
3150 -- non-zero (the lengths must match in any case).
3152 elsif Is_Array_Type
(Typ
) then
3154 Check_Subscripts
: declare
3155 function Construct_Attribute_Reference
3158 Dim
: Nat
) return Node_Id
;
3159 -- Build attribute reference E'Nam(Dim)
3161 -----------------------------------
3162 -- Construct_Attribute_Reference --
3163 -----------------------------------
3165 function Construct_Attribute_Reference
3168 Dim
: Nat
) return Node_Id
3172 Make_Attribute_Reference
(Loc
,
3174 Attribute_Name
=> Nam
,
3175 Expressions
=> New_List
(
3176 Make_Integer_Literal
(Loc
, Dim
)));
3177 end Construct_Attribute_Reference
;
3179 -- Start processing for Check_Subscripts
3182 for J
in 1 .. Number_Dimensions
(Typ
) loop
3183 Evolve_And_Then
(Cond
,
3186 Construct_Attribute_Reference
3187 (Duplicate_Subexpr_No_Checks
(Obj
),
3190 Construct_Attribute_Reference
3191 (New_Occurrence_Of
(Typ
, Loc
), Name_First
, J
)));
3193 Evolve_And_Then
(Cond
,
3196 Construct_Attribute_Reference
3197 (Duplicate_Subexpr_No_Checks
(Obj
),
3200 Construct_Attribute_Reference
3201 (New_Occurrence_Of
(Typ
, Loc
), Name_Last
, J
)));
3210 Right_Opnd
=> Make_Null
(Loc
)),
3211 Right_Opnd
=> Cond
);
3215 Analyze_And_Resolve
(N
, Rtyp
);
3216 end Check_Subscripts
;
3218 -- These are the cases where constraint checks may be
3219 -- required, e.g. records with possible discriminants
3222 -- Expand the test into a series of discriminant comparisons.
3223 -- The expression that is built is the negation of the one
3224 -- that is used for checking discriminant constraints.
3226 Obj
:= Relocate_Node
(Left_Opnd
(N
));
3228 if Has_Discriminants
(Typ
) then
3229 Cond
:= Make_Op_Not
(Loc
,
3230 Right_Opnd
=> Build_Discriminant_Checks
(Obj
, Typ
));
3233 Cond
:= Make_Or_Else
(Loc
,
3237 Right_Opnd
=> Make_Null
(Loc
)),
3238 Right_Opnd
=> Cond
);
3242 Cond
:= New_Occurrence_Of
(Standard_True
, Loc
);
3246 Analyze_And_Resolve
(N
, Rtyp
);
3252 --------------------------------
3253 -- Expand_N_Indexed_Component --
3254 --------------------------------
3256 procedure Expand_N_Indexed_Component
(N
: Node_Id
) is
3257 Loc
: constant Source_Ptr
:= Sloc
(N
);
3258 Typ
: constant Entity_Id
:= Etype
(N
);
3259 P
: constant Node_Id
:= Prefix
(N
);
3260 T
: constant Entity_Id
:= Etype
(P
);
3263 -- A special optimization, if we have an indexed component that
3264 -- is selecting from a slice, then we can eliminate the slice,
3265 -- since, for example, x (i .. j)(k) is identical to x(k). The
3266 -- only difference is the range check required by the slice. The
3267 -- range check for the slice itself has already been generated.
3268 -- The range check for the subscripting operation is ensured
3269 -- by converting the subject to the subtype of the slice.
3271 -- This optimization not only generates better code, avoiding
3272 -- slice messing especially in the packed case, but more importantly
3273 -- bypasses some problems in handling this peculiar case, for
3274 -- example, the issue of dealing specially with object renamings.
3276 if Nkind
(P
) = N_Slice
then
3278 Make_Indexed_Component
(Loc
,
3279 Prefix
=> Prefix
(P
),
3280 Expressions
=> New_List
(
3282 (Etype
(First_Index
(Etype
(P
))),
3283 First
(Expressions
(N
))))));
3284 Analyze_And_Resolve
(N
, Typ
);
3288 -- If the prefix is an access type, then we unconditionally rewrite
3289 -- if as an explicit deference. This simplifies processing for several
3290 -- cases, including packed array cases and certain cases in which
3291 -- checks must be generated. We used to try to do this only when it
3292 -- was necessary, but it cleans up the code to do it all the time.
3294 if Is_Access_Type
(T
) then
3295 Insert_Explicit_Dereference
(P
);
3296 Analyze_And_Resolve
(P
, Designated_Type
(T
));
3299 -- Generate index and validity checks
3301 Generate_Index_Checks
(N
);
3303 if Validity_Checks_On
and then Validity_Check_Subscripts
then
3304 Apply_Subscript_Validity_Checks
(N
);
3307 -- All done for the non-packed case
3309 if not Is_Packed
(Etype
(Prefix
(N
))) then
3313 -- For packed arrays that are not bit-packed (i.e. the case of an array
3314 -- with one or more index types with a non-coniguous enumeration type),
3315 -- we can always use the normal packed element get circuit.
3317 if not Is_Bit_Packed_Array
(Etype
(Prefix
(N
))) then
3318 Expand_Packed_Element_Reference
(N
);
3322 -- For a reference to a component of a bit packed array, we have to
3323 -- convert it to a reference to the corresponding Packed_Array_Type.
3324 -- We only want to do this for simple references, and not for:
3326 -- Left side of assignment, or prefix of left side of assignment,
3327 -- or prefix of the prefix, to handle packed arrays of packed arrays,
3328 -- This case is handled in Exp_Ch5.Expand_N_Assignment_Statement
3330 -- Renaming objects in renaming associations
3331 -- This case is handled when a use of the renamed variable occurs
3333 -- Actual parameters for a procedure call
3334 -- This case is handled in Exp_Ch6.Expand_Actuals
3336 -- The second expression in a 'Read attribute reference
3338 -- The prefix of an address or size attribute reference
3340 -- The following circuit detects these exceptions
3343 Child
: Node_Id
:= N
;
3344 Parnt
: Node_Id
:= Parent
(N
);
3348 if Nkind
(Parnt
) = N_Unchecked_Expression
then
3351 elsif Nkind
(Parnt
) = N_Object_Renaming_Declaration
3352 or else Nkind
(Parnt
) = N_Procedure_Call_Statement
3353 or else (Nkind
(Parnt
) = N_Parameter_Association
3355 Nkind
(Parent
(Parnt
)) = N_Procedure_Call_Statement
)
3359 elsif Nkind
(Parnt
) = N_Attribute_Reference
3360 and then (Attribute_Name
(Parnt
) = Name_Address
3362 Attribute_Name
(Parnt
) = Name_Size
)
3363 and then Prefix
(Parnt
) = Child
3367 elsif Nkind
(Parnt
) = N_Assignment_Statement
3368 and then Name
(Parnt
) = Child
3372 -- If the expression is an index of an indexed component,
3373 -- it must be expanded regardless of context.
3375 elsif Nkind
(Parnt
) = N_Indexed_Component
3376 and then Child
/= Prefix
(Parnt
)
3378 Expand_Packed_Element_Reference
(N
);
3381 elsif Nkind
(Parent
(Parnt
)) = N_Assignment_Statement
3382 and then Name
(Parent
(Parnt
)) = Parnt
3386 elsif Nkind
(Parnt
) = N_Attribute_Reference
3387 and then Attribute_Name
(Parnt
) = Name_Read
3388 and then Next
(First
(Expressions
(Parnt
))) = Child
3392 elsif (Nkind
(Parnt
) = N_Indexed_Component
3393 or else Nkind
(Parnt
) = N_Selected_Component
)
3394 and then Prefix
(Parnt
) = Child
3399 Expand_Packed_Element_Reference
(N
);
3403 -- Keep looking up tree for unchecked expression, or if we are
3404 -- the prefix of a possible assignment left side.
3407 Parnt
:= Parent
(Child
);
3411 end Expand_N_Indexed_Component
;
3413 ---------------------
3414 -- Expand_N_Not_In --
3415 ---------------------
3417 -- Replace a not in b by not (a in b) so that the expansions for (a in b)
3418 -- can be done. This avoids needing to duplicate this expansion code.
3420 procedure Expand_N_Not_In
(N
: Node_Id
) is
3421 Loc
: constant Source_Ptr
:= Sloc
(N
);
3422 Typ
: constant Entity_Id
:= Etype
(N
);
3429 Left_Opnd
=> Left_Opnd
(N
),
3430 Right_Opnd
=> Right_Opnd
(N
))));
3431 Analyze_And_Resolve
(N
, Typ
);
3432 end Expand_N_Not_In
;
3438 -- The only replacement required is for the case of a null of type
3439 -- that is an access to protected subprogram. We represent such
3440 -- access values as a record, and so we must replace the occurrence
3441 -- of null by the equivalent record (with a null address and a null
3442 -- pointer in it), so that the backend creates the proper value.
3444 procedure Expand_N_Null
(N
: Node_Id
) is
3445 Loc
: constant Source_Ptr
:= Sloc
(N
);
3446 Typ
: constant Entity_Id
:= Etype
(N
);
3450 if Ekind
(Typ
) = E_Access_Protected_Subprogram_Type
then
3452 Make_Aggregate
(Loc
,
3453 Expressions
=> New_List
(
3454 New_Occurrence_Of
(RTE
(RE_Null_Address
), Loc
),
3458 Analyze_And_Resolve
(N
, Equivalent_Type
(Typ
));
3460 -- For subsequent semantic analysis, the node must retain its
3461 -- type. Gigi in any case replaces this type by the corresponding
3462 -- record type before processing the node.
3468 when RE_Not_Available
=>
3472 ---------------------
3473 -- Expand_N_Op_Abs --
3474 ---------------------
3476 procedure Expand_N_Op_Abs
(N
: Node_Id
) is
3477 Loc
: constant Source_Ptr
:= Sloc
(N
);
3478 Expr
: constant Node_Id
:= Right_Opnd
(N
);
3481 Unary_Op_Validity_Checks
(N
);
3483 -- Deal with software overflow checking
3485 if not Backend_Overflow_Checks_On_Target
3486 and then Is_Signed_Integer_Type
(Etype
(N
))
3487 and then Do_Overflow_Check
(N
)
3489 -- The only case to worry about is when the argument is
3490 -- equal to the largest negative number, so what we do is
3491 -- to insert the check:
3493 -- [constraint_error when Expr = typ'Base'First]
3495 -- with the usual Duplicate_Subexpr use coding for expr
3498 Make_Raise_Constraint_Error
(Loc
,
3501 Left_Opnd
=> Duplicate_Subexpr
(Expr
),
3503 Make_Attribute_Reference
(Loc
,
3505 New_Occurrence_Of
(Base_Type
(Etype
(Expr
)), Loc
),
3506 Attribute_Name
=> Name_First
)),
3507 Reason
=> CE_Overflow_Check_Failed
));
3510 -- Vax floating-point types case
3512 if Vax_Float
(Etype
(N
)) then
3513 Expand_Vax_Arith
(N
);
3515 end Expand_N_Op_Abs
;
3517 ---------------------
3518 -- Expand_N_Op_Add --
3519 ---------------------
3521 procedure Expand_N_Op_Add
(N
: Node_Id
) is
3522 Typ
: constant Entity_Id
:= Etype
(N
);
3525 Binary_Op_Validity_Checks
(N
);
3527 -- N + 0 = 0 + N = N for integer types
3529 if Is_Integer_Type
(Typ
) then
3530 if Compile_Time_Known_Value
(Right_Opnd
(N
))
3531 and then Expr_Value
(Right_Opnd
(N
)) = Uint_0
3533 Rewrite
(N
, Left_Opnd
(N
));
3536 elsif Compile_Time_Known_Value
(Left_Opnd
(N
))
3537 and then Expr_Value
(Left_Opnd
(N
)) = Uint_0
3539 Rewrite
(N
, Right_Opnd
(N
));
3544 -- Arithmetic overflow checks for signed integer/fixed point types
3546 if Is_Signed_Integer_Type
(Typ
)
3547 or else Is_Fixed_Point_Type
(Typ
)
3549 Apply_Arithmetic_Overflow_Check
(N
);
3552 -- Vax floating-point types case
3554 elsif Vax_Float
(Typ
) then
3555 Expand_Vax_Arith
(N
);
3557 end Expand_N_Op_Add
;
3559 ---------------------
3560 -- Expand_N_Op_And --
3561 ---------------------
3563 procedure Expand_N_Op_And
(N
: Node_Id
) is
3564 Typ
: constant Entity_Id
:= Etype
(N
);
3567 Binary_Op_Validity_Checks
(N
);
3569 if Is_Array_Type
(Etype
(N
)) then
3570 Expand_Boolean_Operator
(N
);
3572 elsif Is_Boolean_Type
(Etype
(N
)) then
3573 Adjust_Condition
(Left_Opnd
(N
));
3574 Adjust_Condition
(Right_Opnd
(N
));
3575 Set_Etype
(N
, Standard_Boolean
);
3576 Adjust_Result_Type
(N
, Typ
);
3578 end Expand_N_Op_And
;
3580 ------------------------
3581 -- Expand_N_Op_Concat --
3582 ------------------------
3584 Max_Available_String_Operands
: Int
:= -1;
3585 -- This is initialized the first time this routine is called. It records
3586 -- a value of 0,2,3,4,5 depending on what Str_Concat_n procedures are
3587 -- available in the run-time:
3590 -- 2 RE_Str_Concat available, RE_Str_Concat_3 not available
3591 -- 3 RE_Str_Concat/Concat_2 available, RE_Str_Concat_4 not available
3592 -- 4 RE_Str_Concat/Concat_2/3 available, RE_Str_Concat_5 not available
3593 -- 5 All routines including RE_Str_Concat_5 available
3595 Char_Concat_Available
: Boolean;
3596 -- Records if the routines RE_Str_Concat_CC/CS/SC are available. True if
3597 -- all three are available, False if any one of these is unavailable.
3599 procedure Expand_N_Op_Concat
(N
: Node_Id
) is
3601 -- List of operands to be concatenated
3604 -- Single operand for concatenation
3607 -- Node which is to be replaced by the result of concatenating
3608 -- the nodes in the list Opnds.
3611 -- Array type of concatenation result type
3614 -- Component type of concatenation represented by Cnode
3617 -- Initialize global variables showing run-time status
3619 if Max_Available_String_Operands
< 1 then
3620 if not RTE_Available
(RE_Str_Concat
) then
3621 Max_Available_String_Operands
:= 0;
3622 elsif not RTE_Available
(RE_Str_Concat_3
) then
3623 Max_Available_String_Operands
:= 2;
3624 elsif not RTE_Available
(RE_Str_Concat_4
) then
3625 Max_Available_String_Operands
:= 3;
3626 elsif not RTE_Available
(RE_Str_Concat_5
) then
3627 Max_Available_String_Operands
:= 4;
3629 Max_Available_String_Operands
:= 5;
3632 Char_Concat_Available
:=
3633 RTE_Available
(RE_Str_Concat_CC
)
3635 RTE_Available
(RE_Str_Concat_CS
)
3637 RTE_Available
(RE_Str_Concat_SC
);
3640 -- Ensure validity of both operands
3642 Binary_Op_Validity_Checks
(N
);
3644 -- If we are the left operand of a concatenation higher up the
3645 -- tree, then do nothing for now, since we want to deal with a
3646 -- series of concatenations as a unit.
3648 if Nkind
(Parent
(N
)) = N_Op_Concat
3649 and then N
= Left_Opnd
(Parent
(N
))
3654 -- We get here with a concatenation whose left operand may be a
3655 -- concatenation itself with a consistent type. We need to process
3656 -- these concatenation operands from left to right, which means
3657 -- from the deepest node in the tree to the highest node.
3660 while Nkind
(Left_Opnd
(Cnode
)) = N_Op_Concat
loop
3661 Cnode
:= Left_Opnd
(Cnode
);
3664 -- Now Opnd is the deepest Opnd, and its parents are the concatenation
3665 -- nodes above, so now we process bottom up, doing the operations. We
3666 -- gather a string that is as long as possible up to five operands
3668 -- The outer loop runs more than once if there are more than five
3669 -- concatenations of type Standard.String, the most we handle for
3670 -- this case, or if more than one concatenation type is involved.
3673 Opnds
:= New_List
(Left_Opnd
(Cnode
), Right_Opnd
(Cnode
));
3674 Set_Parent
(Opnds
, N
);
3676 -- The inner loop gathers concatenation operands. We gather any
3677 -- number of these in the non-string case, or if no concatenation
3678 -- routines are available for string (since in that case we will
3679 -- treat string like any other non-string case). Otherwise we only
3680 -- gather as many operands as can be handled by the available
3681 -- procedures in the run-time library (normally 5, but may be
3682 -- less for the configurable run-time case).
3684 Inner
: while Cnode
/= N
3685 and then (Base_Type
(Etype
(Cnode
)) /= Standard_String
3687 Max_Available_String_Operands
= 0
3689 List_Length
(Opnds
) <
3690 Max_Available_String_Operands
)
3691 and then Base_Type
(Etype
(Cnode
)) =
3692 Base_Type
(Etype
(Parent
(Cnode
)))
3694 Cnode
:= Parent
(Cnode
);
3695 Append
(Right_Opnd
(Cnode
), Opnds
);
3698 -- Here we process the collected operands. First we convert
3699 -- singleton operands to singleton aggregates. This is skipped
3700 -- however for the case of two operands of type String, since
3701 -- we have special routines for these cases.
3703 Atyp
:= Base_Type
(Etype
(Cnode
));
3704 Ctyp
:= Base_Type
(Component_Type
(Etype
(Cnode
)));
3706 if (List_Length
(Opnds
) > 2 or else Atyp
/= Standard_String
)
3707 or else not Char_Concat_Available
3709 Opnd
:= First
(Opnds
);
3711 if Base_Type
(Etype
(Opnd
)) = Ctyp
then
3713 Make_Aggregate
(Sloc
(Cnode
),
3714 Expressions
=> New_List
(Relocate_Node
(Opnd
))));
3715 Analyze_And_Resolve
(Opnd
, Atyp
);
3719 exit when No
(Opnd
);
3723 -- Now call appropriate continuation routine
3725 if Atyp
= Standard_String
3726 and then Max_Available_String_Operands
> 0
3728 Expand_Concatenate_String
(Cnode
, Opnds
);
3730 Expand_Concatenate_Other
(Cnode
, Opnds
);
3733 exit Outer
when Cnode
= N
;
3734 Cnode
:= Parent
(Cnode
);
3736 end Expand_N_Op_Concat
;
3738 ------------------------
3739 -- Expand_N_Op_Divide --
3740 ------------------------
3742 procedure Expand_N_Op_Divide
(N
: Node_Id
) is
3743 Loc
: constant Source_Ptr
:= Sloc
(N
);
3744 Ltyp
: constant Entity_Id
:= Etype
(Left_Opnd
(N
));
3745 Rtyp
: constant Entity_Id
:= Etype
(Right_Opnd
(N
));
3746 Typ
: Entity_Id
:= Etype
(N
);
3749 Binary_Op_Validity_Checks
(N
);
3751 -- Vax_Float is a special case
3753 if Vax_Float
(Typ
) then
3754 Expand_Vax_Arith
(N
);
3758 -- N / 1 = N for integer types
3760 if Is_Integer_Type
(Typ
)
3761 and then Compile_Time_Known_Value
(Right_Opnd
(N
))
3762 and then Expr_Value
(Right_Opnd
(N
)) = Uint_1
3764 Rewrite
(N
, Left_Opnd
(N
));
3768 -- Convert x / 2 ** y to Shift_Right (x, y). Note that the fact that
3769 -- Is_Power_Of_2_For_Shift is set means that we know that our left
3770 -- operand is an unsigned integer, as required for this to work.
3772 if Nkind
(Right_Opnd
(N
)) = N_Op_Expon
3773 and then Is_Power_Of_2_For_Shift
(Right_Opnd
(N
))
3775 -- We cannot do this transformation in configurable run time mode if we
3776 -- have 64-bit -- integers and long shifts are not available.
3780 or else Support_Long_Shifts_On_Target
)
3783 Make_Op_Shift_Right
(Loc
,
3784 Left_Opnd
=> Left_Opnd
(N
),
3786 Convert_To
(Standard_Natural
, Right_Opnd
(Right_Opnd
(N
)))));
3787 Analyze_And_Resolve
(N
, Typ
);
3791 -- Do required fixup of universal fixed operation
3793 if Typ
= Universal_Fixed
then
3794 Fixup_Universal_Fixed_Operation
(N
);
3798 -- Divisions with fixed-point results
3800 if Is_Fixed_Point_Type
(Typ
) then
3802 -- No special processing if Treat_Fixed_As_Integer is set,
3803 -- since from a semantic point of view such operations are
3804 -- simply integer operations and will be treated that way.
3806 if not Treat_Fixed_As_Integer
(N
) then
3807 if Is_Integer_Type
(Rtyp
) then
3808 Expand_Divide_Fixed_By_Integer_Giving_Fixed
(N
);
3810 Expand_Divide_Fixed_By_Fixed_Giving_Fixed
(N
);
3814 -- Other cases of division of fixed-point operands. Again we
3815 -- exclude the case where Treat_Fixed_As_Integer is set.
3817 elsif (Is_Fixed_Point_Type
(Ltyp
) or else
3818 Is_Fixed_Point_Type
(Rtyp
))
3819 and then not Treat_Fixed_As_Integer
(N
)
3821 if Is_Integer_Type
(Typ
) then
3822 Expand_Divide_Fixed_By_Fixed_Giving_Integer
(N
);
3824 pragma Assert
(Is_Floating_Point_Type
(Typ
));
3825 Expand_Divide_Fixed_By_Fixed_Giving_Float
(N
);
3828 -- Mixed-mode operations can appear in a non-static universal
3829 -- context, in which case the integer argument must be converted
3832 elsif Typ
= Universal_Real
3833 and then Is_Integer_Type
(Rtyp
)
3835 Rewrite
(Right_Opnd
(N
),
3836 Convert_To
(Universal_Real
, Relocate_Node
(Right_Opnd
(N
))));
3838 Analyze_And_Resolve
(Right_Opnd
(N
), Universal_Real
);
3840 elsif Typ
= Universal_Real
3841 and then Is_Integer_Type
(Ltyp
)
3843 Rewrite
(Left_Opnd
(N
),
3844 Convert_To
(Universal_Real
, Relocate_Node
(Left_Opnd
(N
))));
3846 Analyze_And_Resolve
(Left_Opnd
(N
), Universal_Real
);
3848 -- Non-fixed point cases, do zero divide and overflow checks
3850 elsif Is_Integer_Type
(Typ
) then
3851 Apply_Divide_Check
(N
);
3853 -- Check for 64-bit division available
3855 if Esize
(Ltyp
) > 32
3856 and then not Support_64_Bit_Divides_On_Target
3858 Error_Msg_CRT
("64-bit division", N
);
3861 end Expand_N_Op_Divide
;
3863 --------------------
3864 -- Expand_N_Op_Eq --
3865 --------------------
3867 procedure Expand_N_Op_Eq
(N
: Node_Id
) is
3868 Loc
: constant Source_Ptr
:= Sloc
(N
);
3869 Typ
: constant Entity_Id
:= Etype
(N
);
3870 Lhs
: constant Node_Id
:= Left_Opnd
(N
);
3871 Rhs
: constant Node_Id
:= Right_Opnd
(N
);
3872 Bodies
: constant List_Id
:= New_List
;
3873 A_Typ
: constant Entity_Id
:= Etype
(Lhs
);
3875 Typl
: Entity_Id
:= A_Typ
;
3876 Op_Name
: Entity_Id
;
3879 procedure Build_Equality_Call
(Eq
: Entity_Id
);
3880 -- If a constructed equality exists for the type or for its parent,
3881 -- build and analyze call, adding conversions if the operation is
3884 function Has_Unconstrained_UU_Component
(Typ
: Node_Id
) return Boolean;
3885 -- Determines whether a type has a subcompoment of an unconstrained
3886 -- Unchecked_Union subtype. Typ is a record type.
3888 -------------------------
3889 -- Build_Equality_Call --
3890 -------------------------
3892 procedure Build_Equality_Call
(Eq
: Entity_Id
) is
3893 Op_Type
: constant Entity_Id
:= Etype
(First_Formal
(Eq
));
3894 L_Exp
: Node_Id
:= Relocate_Node
(Lhs
);
3895 R_Exp
: Node_Id
:= Relocate_Node
(Rhs
);
3898 if Base_Type
(Op_Type
) /= Base_Type
(A_Typ
)
3899 and then not Is_Class_Wide_Type
(A_Typ
)
3901 L_Exp
:= OK_Convert_To
(Op_Type
, L_Exp
);
3902 R_Exp
:= OK_Convert_To
(Op_Type
, R_Exp
);
3905 -- If we have an Unchecked_Union, we need to add the inferred
3906 -- discriminant values as actuals in the function call. At this
3907 -- point, the expansion has determined that both operands have
3908 -- inferable discriminants.
3910 if Is_Unchecked_Union
(Op_Type
) then
3912 Lhs_Type
: constant Node_Id
:= Etype
(L_Exp
);
3913 Rhs_Type
: constant Node_Id
:= Etype
(R_Exp
);
3914 Lhs_Discr_Val
: Node_Id
;
3915 Rhs_Discr_Val
: Node_Id
;
3918 -- Per-object constrained selected components require special
3919 -- attention. If the enclosing scope of the component is an
3920 -- Unchecked_Union, we can not reference its discriminants
3921 -- directly. This is why we use the two extra parameters of
3922 -- the equality function of the enclosing Unchecked_Union.
3924 -- type UU_Type (Discr : Integer := 0) is
3927 -- pragma Unchecked_Union (UU_Type);
3929 -- 1. Unchecked_Union enclosing record:
3931 -- type Enclosing_UU_Type (Discr : Integer := 0) is record
3933 -- Comp : UU_Type (Discr);
3935 -- end Enclosing_UU_Type;
3936 -- pragma Unchecked_Union (Enclosing_UU_Type);
3938 -- Obj1 : Enclosing_UU_Type;
3939 -- Obj2 : Enclosing_UU_Type (1);
3941 -- [. . .] Obj1 = Obj2 [. . .]
3945 -- if not (uu_typeEQ (obj1.comp, obj2.comp, a, b)) then
3947 -- A and B are the formal parameters of the equality function
3948 -- of Enclosing_UU_Type. The function always has two extra
3949 -- formals to capture the inferred discriminant values.
3951 -- 2. Non-Unchecked_Union enclosing record:
3954 -- Enclosing_Non_UU_Type (Discr : Integer := 0)
3957 -- Comp : UU_Type (Discr);
3959 -- end Enclosing_Non_UU_Type;
3961 -- Obj1 : Enclosing_Non_UU_Type;
3962 -- Obj2 : Enclosing_Non_UU_Type (1);
3964 -- . . . Obj1 = Obj2 . . .
3968 -- if not (uu_typeEQ (obj1.comp, obj2.comp,
3969 -- obj1.discr, obj2.discr)) then
3971 -- In this case we can directly reference the discriminants of
3972 -- the enclosing record.
3976 if Nkind
(Lhs
) = N_Selected_Component
3977 and then Has_Per_Object_Constraint
3978 (Entity
(Selector_Name
(Lhs
)))
3980 -- Enclosing record is an Unchecked_Union, use formal A
3982 if Is_Unchecked_Union
(Scope
3983 (Entity
(Selector_Name
(Lhs
))))
3986 Make_Identifier
(Loc
,
3989 -- Enclosing record is of a non-Unchecked_Union type, it is
3990 -- possible to reference the discriminant.
3994 Make_Selected_Component
(Loc
,
3995 Prefix
=> Prefix
(Lhs
),
3998 (Get_Discriminant_Value
3999 (First_Discriminant
(Lhs_Type
),
4001 Stored_Constraint
(Lhs_Type
))));
4004 -- Comment needed here ???
4007 -- Infer the discriminant value
4011 (Get_Discriminant_Value
4012 (First_Discriminant
(Lhs_Type
),
4014 Stored_Constraint
(Lhs_Type
)));
4019 if Nkind
(Rhs
) = N_Selected_Component
4020 and then Has_Per_Object_Constraint
4021 (Entity
(Selector_Name
(Rhs
)))
4023 if Is_Unchecked_Union
4024 (Scope
(Entity
(Selector_Name
(Rhs
))))
4027 Make_Identifier
(Loc
,
4032 Make_Selected_Component
(Loc
,
4033 Prefix
=> Prefix
(Rhs
),
4035 New_Copy
(Get_Discriminant_Value
(
4036 First_Discriminant
(Rhs_Type
),
4038 Stored_Constraint
(Rhs_Type
))));
4043 New_Copy
(Get_Discriminant_Value
(
4044 First_Discriminant
(Rhs_Type
),
4046 Stored_Constraint
(Rhs_Type
)));
4051 Make_Function_Call
(Loc
,
4052 Name
=> New_Reference_To
(Eq
, Loc
),
4053 Parameter_Associations
=> New_List
(
4060 -- Normal case, not an unchecked union
4064 Make_Function_Call
(Loc
,
4065 Name
=> New_Reference_To
(Eq
, Loc
),
4066 Parameter_Associations
=> New_List
(L_Exp
, R_Exp
)));
4069 Analyze_And_Resolve
(N
, Standard_Boolean
, Suppress
=> All_Checks
);
4070 end Build_Equality_Call
;
4072 ------------------------------------
4073 -- Has_Unconstrained_UU_Component --
4074 ------------------------------------
4076 function Has_Unconstrained_UU_Component
4077 (Typ
: Node_Id
) return Boolean
4079 Tdef
: constant Node_Id
:=
4080 Type_Definition
(Declaration_Node
(Typ
));
4084 function Component_Is_Unconstrained_UU
4085 (Comp
: Node_Id
) return Boolean;
4086 -- Determines whether the subtype of the component is an
4087 -- unconstrained Unchecked_Union.
4089 function Variant_Is_Unconstrained_UU
4090 (Variant
: Node_Id
) return Boolean;
4091 -- Determines whether a component of the variant has an unconstrained
4092 -- Unchecked_Union subtype.
4094 -----------------------------------
4095 -- Component_Is_Unconstrained_UU --
4096 -----------------------------------
4098 function Component_Is_Unconstrained_UU
4099 (Comp
: Node_Id
) return Boolean
4102 if Nkind
(Comp
) /= N_Component_Declaration
then
4107 Sindic
: constant Node_Id
:=
4108 Subtype_Indication
(Component_Definition
(Comp
));
4111 -- Unconstrained nominal type. In the case of a constraint
4112 -- present, the node kind would have been N_Subtype_Indication.
4114 if Nkind
(Sindic
) = N_Identifier
then
4115 return Is_Unchecked_Union
(Base_Type
(Etype
(Sindic
)));
4120 end Component_Is_Unconstrained_UU
;
4122 ---------------------------------
4123 -- Variant_Is_Unconstrained_UU --
4124 ---------------------------------
4126 function Variant_Is_Unconstrained_UU
4127 (Variant
: Node_Id
) return Boolean
4129 Clist
: constant Node_Id
:= Component_List
(Variant
);
4132 if Is_Empty_List
(Component_Items
(Clist
)) then
4137 Comp
: Node_Id
:= First
(Component_Items
(Clist
));
4140 while Present
(Comp
) loop
4142 -- One component is sufficent
4144 if Component_Is_Unconstrained_UU
(Comp
) then
4152 -- None of the components withing the variant were of
4153 -- unconstrained Unchecked_Union type.
4156 end Variant_Is_Unconstrained_UU
;
4158 -- Start of processing for Has_Unconstrained_UU_Component
4161 if Null_Present
(Tdef
) then
4165 Clist
:= Component_List
(Tdef
);
4166 Vpart
:= Variant_Part
(Clist
);
4168 -- Inspect available components
4170 if Present
(Component_Items
(Clist
)) then
4172 Comp
: Node_Id
:= First
(Component_Items
(Clist
));
4175 while Present
(Comp
) loop
4177 -- One component is sufficent
4179 if Component_Is_Unconstrained_UU
(Comp
) then
4188 -- Inspect available components withing variants
4190 if Present
(Vpart
) then
4192 Variant
: Node_Id
:= First
(Variants
(Vpart
));
4195 while Present
(Variant
) loop
4197 -- One component within a variant is sufficent
4199 if Variant_Is_Unconstrained_UU
(Variant
) then
4208 -- Neither the available components, nor the components inside the
4209 -- variant parts were of an unconstrained Unchecked_Union subtype.
4212 end Has_Unconstrained_UU_Component
;
4214 -- Start of processing for Expand_N_Op_Eq
4217 Binary_Op_Validity_Checks
(N
);
4219 if Ekind
(Typl
) = E_Private_Type
then
4220 Typl
:= Underlying_Type
(Typl
);
4222 elsif Ekind
(Typl
) = E_Private_Subtype
then
4223 Typl
:= Underlying_Type
(Base_Type
(Typl
));
4226 -- It may happen in error situations that the underlying type is not
4227 -- set. The error will be detected later, here we just defend the
4234 Typl
:= Base_Type
(Typl
);
4238 if Vax_Float
(Typl
) then
4239 Expand_Vax_Comparison
(N
);
4242 -- Boolean types (requiring handling of non-standard case)
4244 elsif Is_Boolean_Type
(Typl
) then
4245 Adjust_Condition
(Left_Opnd
(N
));
4246 Adjust_Condition
(Right_Opnd
(N
));
4247 Set_Etype
(N
, Standard_Boolean
);
4248 Adjust_Result_Type
(N
, Typ
);
4252 elsif Is_Array_Type
(Typl
) then
4254 -- If we are doing full validity checking, then expand out array
4255 -- comparisons to make sure that we check the array elements.
4257 if Validity_Check_Operands
then
4259 Save_Force_Validity_Checks
: constant Boolean :=
4260 Force_Validity_Checks
;
4262 Force_Validity_Checks
:= True;
4264 Expand_Array_Equality
4266 Relocate_Node
(Lhs
),
4267 Relocate_Node
(Rhs
),
4270 Insert_Actions
(N
, Bodies
);
4271 Analyze_And_Resolve
(N
, Standard_Boolean
);
4272 Force_Validity_Checks
:= Save_Force_Validity_Checks
;
4275 -- Packed case where both operands are known aligned
4277 elsif Is_Bit_Packed_Array
(Typl
)
4278 and then not Is_Possibly_Unaligned_Object
(Lhs
)
4279 and then not Is_Possibly_Unaligned_Object
(Rhs
)
4281 Expand_Packed_Eq
(N
);
4283 -- Where the component type is elementary we can use a block bit
4284 -- comparison (if supported on the target) exception in the case
4285 -- of floating-point (negative zero issues require element by
4286 -- element comparison), and atomic types (where we must be sure
4287 -- to load elements independently) and possibly unaligned arrays.
4289 elsif Is_Elementary_Type
(Component_Type
(Typl
))
4290 and then not Is_Floating_Point_Type
(Component_Type
(Typl
))
4291 and then not Is_Atomic
(Component_Type
(Typl
))
4292 and then not Is_Possibly_Unaligned_Object
(Lhs
)
4293 and then not Is_Possibly_Unaligned_Object
(Rhs
)
4294 and then Support_Composite_Compare_On_Target
4298 -- For composite and floating-point cases, expand equality loop
4299 -- to make sure of using proper comparisons for tagged types,
4300 -- and correctly handling the floating-point case.
4304 Expand_Array_Equality
4306 Relocate_Node
(Lhs
),
4307 Relocate_Node
(Rhs
),
4310 Insert_Actions
(N
, Bodies
, Suppress
=> All_Checks
);
4311 Analyze_And_Resolve
(N
, Standard_Boolean
, Suppress
=> All_Checks
);
4316 elsif Is_Record_Type
(Typl
) then
4318 -- For tagged types, use the primitive "="
4320 if Is_Tagged_Type
(Typl
) then
4322 -- If this is derived from an untagged private type completed
4323 -- with a tagged type, it does not have a full view, so we
4324 -- use the primitive operations of the private type.
4325 -- This check should no longer be necessary when these
4326 -- types receive their full views ???
4328 if Is_Private_Type
(A_Typ
)
4329 and then not Is_Tagged_Type
(A_Typ
)
4330 and then Is_Derived_Type
(A_Typ
)
4331 and then No
(Full_View
(A_Typ
))
4333 -- Search for equality operation, checking that the
4334 -- operands have the same type. Note that we must find
4335 -- a matching entry, or something is very wrong!
4337 Prim
:= First_Elmt
(Collect_Primitive_Operations
(A_Typ
));
4339 while Present
(Prim
) loop
4340 exit when Chars
(Node
(Prim
)) = Name_Op_Eq
4341 and then Etype
(First_Formal
(Node
(Prim
))) =
4342 Etype
(Next_Formal
(First_Formal
(Node
(Prim
))))
4344 Base_Type
(Etype
(Node
(Prim
))) = Standard_Boolean
;
4349 pragma Assert
(Present
(Prim
));
4350 Op_Name
:= Node
(Prim
);
4352 -- Find the type's predefined equality or an overriding
4353 -- user-defined equality. The reason for not simply calling
4354 -- Find_Prim_Op here is that there may be a user-defined
4355 -- overloaded equality op that precedes the equality that
4356 -- we want, so we have to explicitly search (e.g., there
4357 -- could be an equality with two different parameter types).
4360 if Is_Class_Wide_Type
(Typl
) then
4361 Typl
:= Root_Type
(Typl
);
4364 Prim
:= First_Elmt
(Primitive_Operations
(Typl
));
4365 while Present
(Prim
) loop
4366 exit when Chars
(Node
(Prim
)) = Name_Op_Eq
4367 and then Etype
(First_Formal
(Node
(Prim
))) =
4368 Etype
(Next_Formal
(First_Formal
(Node
(Prim
))))
4370 Base_Type
(Etype
(Node
(Prim
))) = Standard_Boolean
;
4375 pragma Assert
(Present
(Prim
));
4376 Op_Name
:= Node
(Prim
);
4379 Build_Equality_Call
(Op_Name
);
4381 -- Ada 2005 (AI-216): Program_Error is raised when evaluating the
4382 -- predefined equality operator for a type which has a subcomponent
4383 -- of an Unchecked_Union type whose nominal subtype is unconstrained.
4385 elsif Has_Unconstrained_UU_Component
(Typl
) then
4387 Make_Raise_Program_Error
(Loc
,
4388 Reason
=> PE_Unchecked_Union_Restriction
));
4390 -- Prevent Gigi from generating incorrect code by rewriting the
4391 -- equality as a standard False.
4394 New_Occurrence_Of
(Standard_False
, Loc
));
4396 elsif Is_Unchecked_Union
(Typl
) then
4398 -- If we can infer the discriminants of the operands, we make a
4399 -- call to the TSS equality function.
4401 if Has_Inferable_Discriminants
(Lhs
)
4403 Has_Inferable_Discriminants
(Rhs
)
4406 (TSS
(Root_Type
(Typl
), TSS_Composite_Equality
));
4409 -- Ada 2005 (AI-216): Program_Error is raised when evaluating
4410 -- the predefined equality operator for an Unchecked_Union type
4411 -- if either of the operands lack inferable discriminants.
4414 Make_Raise_Program_Error
(Loc
,
4415 Reason
=> PE_Unchecked_Union_Restriction
));
4417 -- Prevent Gigi from generating incorrect code by rewriting
4418 -- the equality as a standard False.
4421 New_Occurrence_Of
(Standard_False
, Loc
));
4425 -- If a type support function is present (for complex cases), use it
4427 elsif Present
(TSS
(Root_Type
(Typl
), TSS_Composite_Equality
)) then
4429 (TSS
(Root_Type
(Typl
), TSS_Composite_Equality
));
4431 -- Otherwise expand the component by component equality. Note that
4432 -- we never use block-bit coparisons for records, because of the
4433 -- problems with gaps. The backend will often be able to recombine
4434 -- the separate comparisons that we generate here.
4437 Remove_Side_Effects
(Lhs
);
4438 Remove_Side_Effects
(Rhs
);
4440 Expand_Record_Equality
(N
, Typl
, Lhs
, Rhs
, Bodies
));
4442 Insert_Actions
(N
, Bodies
, Suppress
=> All_Checks
);
4443 Analyze_And_Resolve
(N
, Standard_Boolean
, Suppress
=> All_Checks
);
4447 -- If we still have an equality comparison (i.e. it was not rewritten
4448 -- in some way), then we can test if result is needed at compile time).
4450 if Nkind
(N
) = N_Op_Eq
then
4451 Rewrite_Comparison
(N
);
4455 -----------------------
4456 -- Expand_N_Op_Expon --
4457 -----------------------
4459 procedure Expand_N_Op_Expon
(N
: Node_Id
) is
4460 Loc
: constant Source_Ptr
:= Sloc
(N
);
4461 Typ
: constant Entity_Id
:= Etype
(N
);
4462 Rtyp
: constant Entity_Id
:= Root_Type
(Typ
);
4463 Base
: constant Node_Id
:= Relocate_Node
(Left_Opnd
(N
));
4464 Bastyp
: constant Node_Id
:= Etype
(Base
);
4465 Exp
: constant Node_Id
:= Relocate_Node
(Right_Opnd
(N
));
4466 Exptyp
: constant Entity_Id
:= Etype
(Exp
);
4467 Ovflo
: constant Boolean := Do_Overflow_Check
(N
);
4476 Binary_Op_Validity_Checks
(N
);
4478 -- If either operand is of a private type, then we have the use of
4479 -- an intrinsic operator, and we get rid of the privateness, by using
4480 -- root types of underlying types for the actual operation. Otherwise
4481 -- the private types will cause trouble if we expand multiplications
4482 -- or shifts etc. We also do this transformation if the result type
4483 -- is different from the base type.
4485 if Is_Private_Type
(Etype
(Base
))
4487 Is_Private_Type
(Typ
)
4489 Is_Private_Type
(Exptyp
)
4491 Rtyp
/= Root_Type
(Bastyp
)
4494 Bt
: constant Entity_Id
:= Root_Type
(Underlying_Type
(Bastyp
));
4495 Et
: constant Entity_Id
:= Root_Type
(Underlying_Type
(Exptyp
));
4499 Unchecked_Convert_To
(Typ
,
4501 Left_Opnd
=> Unchecked_Convert_To
(Bt
, Base
),
4502 Right_Opnd
=> Unchecked_Convert_To
(Et
, Exp
))));
4503 Analyze_And_Resolve
(N
, Typ
);
4508 -- Test for case of known right argument
4510 if Compile_Time_Known_Value
(Exp
) then
4511 Expv
:= Expr_Value
(Exp
);
4513 -- We only fold small non-negative exponents. You might think we
4514 -- could fold small negative exponents for the real case, but we
4515 -- can't because we are required to raise Constraint_Error for
4516 -- the case of 0.0 ** (negative) even if Machine_Overflows = False.
4517 -- See ACVC test C4A012B.
4519 if Expv
>= 0 and then Expv
<= 4 then
4521 -- X ** 0 = 1 (or 1.0)
4524 if Ekind
(Typ
) in Integer_Kind
then
4525 Xnode
:= Make_Integer_Literal
(Loc
, Intval
=> 1);
4527 Xnode
:= Make_Real_Literal
(Loc
, Ureal_1
);
4539 Make_Op_Multiply
(Loc
,
4540 Left_Opnd
=> Duplicate_Subexpr
(Base
),
4541 Right_Opnd
=> Duplicate_Subexpr_No_Checks
(Base
));
4543 -- X ** 3 = X * X * X
4547 Make_Op_Multiply
(Loc
,
4549 Make_Op_Multiply
(Loc
,
4550 Left_Opnd
=> Duplicate_Subexpr
(Base
),
4551 Right_Opnd
=> Duplicate_Subexpr_No_Checks
(Base
)),
4552 Right_Opnd
=> Duplicate_Subexpr_No_Checks
(Base
));
4555 -- En : constant base'type := base * base;
4561 Make_Defining_Identifier
(Loc
, New_Internal_Name
('E'));
4563 Insert_Actions
(N
, New_List
(
4564 Make_Object_Declaration
(Loc
,
4565 Defining_Identifier
=> Temp
,
4566 Constant_Present
=> True,
4567 Object_Definition
=> New_Reference_To
(Typ
, Loc
),
4569 Make_Op_Multiply
(Loc
,
4570 Left_Opnd
=> Duplicate_Subexpr
(Base
),
4571 Right_Opnd
=> Duplicate_Subexpr_No_Checks
(Base
)))));
4574 Make_Op_Multiply
(Loc
,
4575 Left_Opnd
=> New_Reference_To
(Temp
, Loc
),
4576 Right_Opnd
=> New_Reference_To
(Temp
, Loc
));
4580 Analyze_And_Resolve
(N
, Typ
);
4585 -- Case of (2 ** expression) appearing as an argument of an integer
4586 -- multiplication, or as the right argument of a division of a non-
4587 -- negative integer. In such cases we leave the node untouched, setting
4588 -- the flag Is_Natural_Power_Of_2_for_Shift set, then the expansion
4589 -- of the higher level node converts it into a shift.
4591 if Nkind
(Base
) = N_Integer_Literal
4592 and then Intval
(Base
) = 2
4593 and then Is_Integer_Type
(Root_Type
(Exptyp
))
4594 and then Esize
(Root_Type
(Exptyp
)) <= Esize
(Standard_Integer
)
4595 and then Is_Unsigned_Type
(Exptyp
)
4597 and then Nkind
(Parent
(N
)) in N_Binary_Op
4600 P
: constant Node_Id
:= Parent
(N
);
4601 L
: constant Node_Id
:= Left_Opnd
(P
);
4602 R
: constant Node_Id
:= Right_Opnd
(P
);
4605 if (Nkind
(P
) = N_Op_Multiply
4607 ((Is_Integer_Type
(Etype
(L
)) and then R
= N
)
4609 (Is_Integer_Type
(Etype
(R
)) and then L
= N
))
4610 and then not Do_Overflow_Check
(P
))
4613 (Nkind
(P
) = N_Op_Divide
4614 and then Is_Integer_Type
(Etype
(L
))
4615 and then Is_Unsigned_Type
(Etype
(L
))
4617 and then not Do_Overflow_Check
(P
))
4619 Set_Is_Power_Of_2_For_Shift
(N
);
4625 -- Fall through if exponentiation must be done using a runtime routine
4627 -- First deal with modular case
4629 if Is_Modular_Integer_Type
(Rtyp
) then
4631 -- Non-binary case, we call the special exponentiation routine for
4632 -- the non-binary case, converting the argument to Long_Long_Integer
4633 -- and passing the modulus value. Then the result is converted back
4634 -- to the base type.
4636 if Non_Binary_Modulus
(Rtyp
) then
4639 Make_Function_Call
(Loc
,
4640 Name
=> New_Reference_To
(RTE
(RE_Exp_Modular
), Loc
),
4641 Parameter_Associations
=> New_List
(
4642 Convert_To
(Standard_Integer
, Base
),
4643 Make_Integer_Literal
(Loc
, Modulus
(Rtyp
)),
4646 -- Binary case, in this case, we call one of two routines, either
4647 -- the unsigned integer case, or the unsigned long long integer
4648 -- case, with a final "and" operation to do the required mod.
4651 if UI_To_Int
(Esize
(Rtyp
)) <= Standard_Integer_Size
then
4652 Ent
:= RTE
(RE_Exp_Unsigned
);
4654 Ent
:= RTE
(RE_Exp_Long_Long_Unsigned
);
4661 Make_Function_Call
(Loc
,
4662 Name
=> New_Reference_To
(Ent
, Loc
),
4663 Parameter_Associations
=> New_List
(
4664 Convert_To
(Etype
(First_Formal
(Ent
)), Base
),
4667 Make_Integer_Literal
(Loc
, Modulus
(Rtyp
) - 1))));
4671 -- Common exit point for modular type case
4673 Analyze_And_Resolve
(N
, Typ
);
4676 -- Signed integer cases, done using either Integer or Long_Long_Integer.
4677 -- It is not worth having routines for Short_[Short_]Integer, since for
4678 -- most machines it would not help, and it would generate more code that
4679 -- might need certification in the HI-E case.
4681 -- In the integer cases, we have two routines, one for when overflow
4682 -- checks are required, and one when they are not required, since
4683 -- there is a real gain in ommitting checks on many machines.
4685 elsif Rtyp
= Base_Type
(Standard_Long_Long_Integer
)
4686 or else (Rtyp
= Base_Type
(Standard_Long_Integer
)
4688 Esize
(Standard_Long_Integer
) > Esize
(Standard_Integer
))
4689 or else (Rtyp
= Universal_Integer
)
4691 Etyp
:= Standard_Long_Long_Integer
;
4694 Rent
:= RE_Exp_Long_Long_Integer
;
4696 Rent
:= RE_Exn_Long_Long_Integer
;
4699 elsif Is_Signed_Integer_Type
(Rtyp
) then
4700 Etyp
:= Standard_Integer
;
4703 Rent
:= RE_Exp_Integer
;
4705 Rent
:= RE_Exn_Integer
;
4708 -- Floating-point cases, always done using Long_Long_Float. We do not
4709 -- need separate routines for the overflow case here, since in the case
4710 -- of floating-point, we generate infinities anyway as a rule (either
4711 -- that or we automatically trap overflow), and if there is an infinity
4712 -- generated and a range check is required, the check will fail anyway.
4715 pragma Assert
(Is_Floating_Point_Type
(Rtyp
));
4716 Etyp
:= Standard_Long_Long_Float
;
4717 Rent
:= RE_Exn_Long_Long_Float
;
4720 -- Common processing for integer cases and floating-point cases.
4721 -- If we are in the right type, we can call runtime routine directly
4724 and then Rtyp
/= Universal_Integer
4725 and then Rtyp
/= Universal_Real
4728 Make_Function_Call
(Loc
,
4729 Name
=> New_Reference_To
(RTE
(Rent
), Loc
),
4730 Parameter_Associations
=> New_List
(Base
, Exp
)));
4732 -- Otherwise we have to introduce conversions (conversions are also
4733 -- required in the universal cases, since the runtime routine is
4734 -- typed using one of the standard types.
4739 Make_Function_Call
(Loc
,
4740 Name
=> New_Reference_To
(RTE
(Rent
), Loc
),
4741 Parameter_Associations
=> New_List
(
4742 Convert_To
(Etyp
, Base
),
4746 Analyze_And_Resolve
(N
, Typ
);
4750 when RE_Not_Available
=>
4752 end Expand_N_Op_Expon
;
4754 --------------------
4755 -- Expand_N_Op_Ge --
4756 --------------------
4758 procedure Expand_N_Op_Ge
(N
: Node_Id
) is
4759 Typ
: constant Entity_Id
:= Etype
(N
);
4760 Op1
: constant Node_Id
:= Left_Opnd
(N
);
4761 Op2
: constant Node_Id
:= Right_Opnd
(N
);
4762 Typ1
: constant Entity_Id
:= Base_Type
(Etype
(Op1
));
4765 Binary_Op_Validity_Checks
(N
);
4767 if Vax_Float
(Typ1
) then
4768 Expand_Vax_Comparison
(N
);
4771 elsif Is_Array_Type
(Typ1
) then
4772 Expand_Array_Comparison
(N
);
4776 if Is_Boolean_Type
(Typ1
) then
4777 Adjust_Condition
(Op1
);
4778 Adjust_Condition
(Op2
);
4779 Set_Etype
(N
, Standard_Boolean
);
4780 Adjust_Result_Type
(N
, Typ
);
4783 Rewrite_Comparison
(N
);
4786 --------------------
4787 -- Expand_N_Op_Gt --
4788 --------------------
4790 procedure Expand_N_Op_Gt
(N
: Node_Id
) is
4791 Typ
: constant Entity_Id
:= Etype
(N
);
4792 Op1
: constant Node_Id
:= Left_Opnd
(N
);
4793 Op2
: constant Node_Id
:= Right_Opnd
(N
);
4794 Typ1
: constant Entity_Id
:= Base_Type
(Etype
(Op1
));
4797 Binary_Op_Validity_Checks
(N
);
4799 if Vax_Float
(Typ1
) then
4800 Expand_Vax_Comparison
(N
);
4803 elsif Is_Array_Type
(Typ1
) then
4804 Expand_Array_Comparison
(N
);
4808 if Is_Boolean_Type
(Typ1
) then
4809 Adjust_Condition
(Op1
);
4810 Adjust_Condition
(Op2
);
4811 Set_Etype
(N
, Standard_Boolean
);
4812 Adjust_Result_Type
(N
, Typ
);
4815 Rewrite_Comparison
(N
);
4818 --------------------
4819 -- Expand_N_Op_Le --
4820 --------------------
4822 procedure Expand_N_Op_Le
(N
: Node_Id
) is
4823 Typ
: constant Entity_Id
:= Etype
(N
);
4824 Op1
: constant Node_Id
:= Left_Opnd
(N
);
4825 Op2
: constant Node_Id
:= Right_Opnd
(N
);
4826 Typ1
: constant Entity_Id
:= Base_Type
(Etype
(Op1
));
4829 Binary_Op_Validity_Checks
(N
);
4831 if Vax_Float
(Typ1
) then
4832 Expand_Vax_Comparison
(N
);
4835 elsif Is_Array_Type
(Typ1
) then
4836 Expand_Array_Comparison
(N
);
4840 if Is_Boolean_Type
(Typ1
) then
4841 Adjust_Condition
(Op1
);
4842 Adjust_Condition
(Op2
);
4843 Set_Etype
(N
, Standard_Boolean
);
4844 Adjust_Result_Type
(N
, Typ
);
4847 Rewrite_Comparison
(N
);
4850 --------------------
4851 -- Expand_N_Op_Lt --
4852 --------------------
4854 procedure Expand_N_Op_Lt
(N
: Node_Id
) is
4855 Typ
: constant Entity_Id
:= Etype
(N
);
4856 Op1
: constant Node_Id
:= Left_Opnd
(N
);
4857 Op2
: constant Node_Id
:= Right_Opnd
(N
);
4858 Typ1
: constant Entity_Id
:= Base_Type
(Etype
(Op1
));
4861 Binary_Op_Validity_Checks
(N
);
4863 if Vax_Float
(Typ1
) then
4864 Expand_Vax_Comparison
(N
);
4867 elsif Is_Array_Type
(Typ1
) then
4868 Expand_Array_Comparison
(N
);
4872 if Is_Boolean_Type
(Typ1
) then
4873 Adjust_Condition
(Op1
);
4874 Adjust_Condition
(Op2
);
4875 Set_Etype
(N
, Standard_Boolean
);
4876 Adjust_Result_Type
(N
, Typ
);
4879 Rewrite_Comparison
(N
);
4882 -----------------------
4883 -- Expand_N_Op_Minus --
4884 -----------------------
4886 procedure Expand_N_Op_Minus
(N
: Node_Id
) is
4887 Loc
: constant Source_Ptr
:= Sloc
(N
);
4888 Typ
: constant Entity_Id
:= Etype
(N
);
4891 Unary_Op_Validity_Checks
(N
);
4893 if not Backend_Overflow_Checks_On_Target
4894 and then Is_Signed_Integer_Type
(Etype
(N
))
4895 and then Do_Overflow_Check
(N
)
4897 -- Software overflow checking expands -expr into (0 - expr)
4900 Make_Op_Subtract
(Loc
,
4901 Left_Opnd
=> Make_Integer_Literal
(Loc
, 0),
4902 Right_Opnd
=> Right_Opnd
(N
)));
4904 Analyze_And_Resolve
(N
, Typ
);
4906 -- Vax floating-point types case
4908 elsif Vax_Float
(Etype
(N
)) then
4909 Expand_Vax_Arith
(N
);
4911 end Expand_N_Op_Minus
;
4913 ---------------------
4914 -- Expand_N_Op_Mod --
4915 ---------------------
4917 procedure Expand_N_Op_Mod
(N
: Node_Id
) is
4918 Loc
: constant Source_Ptr
:= Sloc
(N
);
4919 Typ
: constant Entity_Id
:= Etype
(N
);
4920 Left
: constant Node_Id
:= Left_Opnd
(N
);
4921 Right
: constant Node_Id
:= Right_Opnd
(N
);
4922 DOC
: constant Boolean := Do_Overflow_Check
(N
);
4923 DDC
: constant Boolean := Do_Division_Check
(N
);
4934 Binary_Op_Validity_Checks
(N
);
4936 Determine_Range
(Right
, ROK
, Rlo
, Rhi
);
4937 Determine_Range
(Left
, LOK
, Llo
, Lhi
);
4939 -- Convert mod to rem if operands are known non-negative. We do this
4940 -- since it is quite likely that this will improve the quality of code,
4941 -- (the operation now corresponds to the hardware remainder), and it
4942 -- does not seem likely that it could be harmful.
4944 if LOK
and then Llo
>= 0
4946 ROK
and then Rlo
>= 0
4949 Make_Op_Rem
(Sloc
(N
),
4950 Left_Opnd
=> Left_Opnd
(N
),
4951 Right_Opnd
=> Right_Opnd
(N
)));
4953 -- Instead of reanalyzing the node we do the analysis manually.
4954 -- This avoids anomalies when the replacement is done in an
4955 -- instance and is epsilon more efficient.
4957 Set_Entity
(N
, Standard_Entity
(S_Op_Rem
));
4959 Set_Do_Overflow_Check
(N
, DOC
);
4960 Set_Do_Division_Check
(N
, DDC
);
4961 Expand_N_Op_Rem
(N
);
4964 -- Otherwise, normal mod processing
4967 if Is_Integer_Type
(Etype
(N
)) then
4968 Apply_Divide_Check
(N
);
4971 -- Apply optimization x mod 1 = 0. We don't really need that with
4972 -- gcc, but it is useful with other back ends (e.g. AAMP), and is
4973 -- certainly harmless.
4975 if Is_Integer_Type
(Etype
(N
))
4976 and then Compile_Time_Known_Value
(Right
)
4977 and then Expr_Value
(Right
) = Uint_1
4979 Rewrite
(N
, Make_Integer_Literal
(Loc
, 0));
4980 Analyze_And_Resolve
(N
, Typ
);
4984 -- Deal with annoying case of largest negative number remainder
4985 -- minus one. Gigi does not handle this case correctly, because
4986 -- it generates a divide instruction which may trap in this case.
4988 -- In fact the check is quite easy, if the right operand is -1,
4989 -- then the mod value is always 0, and we can just ignore the
4990 -- left operand completely in this case.
4992 -- The operand type may be private (e.g. in the expansion of an
4993 -- an intrinsic operation) so we must use the underlying type to
4994 -- get the bounds, and convert the literals explicitly.
4998 (Type_Low_Bound
(Base_Type
(Underlying_Type
(Etype
(Left
)))));
5000 if ((not ROK
) or else (Rlo
<= (-1) and then (-1) <= Rhi
))
5002 ((not LOK
) or else (Llo
= LLB
))
5005 Make_Conditional_Expression
(Loc
,
5006 Expressions
=> New_List
(
5008 Left_Opnd
=> Duplicate_Subexpr
(Right
),
5010 Unchecked_Convert_To
(Typ
,
5011 Make_Integer_Literal
(Loc
, -1))),
5012 Unchecked_Convert_To
(Typ
,
5013 Make_Integer_Literal
(Loc
, Uint_0
)),
5014 Relocate_Node
(N
))));
5016 Set_Analyzed
(Next
(Next
(First
(Expressions
(N
)))));
5017 Analyze_And_Resolve
(N
, Typ
);
5020 end Expand_N_Op_Mod
;
5022 --------------------------
5023 -- Expand_N_Op_Multiply --
5024 --------------------------
5026 procedure Expand_N_Op_Multiply
(N
: Node_Id
) is
5027 Loc
: constant Source_Ptr
:= Sloc
(N
);
5028 Lop
: constant Node_Id
:= Left_Opnd
(N
);
5029 Rop
: constant Node_Id
:= Right_Opnd
(N
);
5031 Lp2
: constant Boolean :=
5032 Nkind
(Lop
) = N_Op_Expon
5033 and then Is_Power_Of_2_For_Shift
(Lop
);
5035 Rp2
: constant Boolean :=
5036 Nkind
(Rop
) = N_Op_Expon
5037 and then Is_Power_Of_2_For_Shift
(Rop
);
5039 Ltyp
: constant Entity_Id
:= Etype
(Lop
);
5040 Rtyp
: constant Entity_Id
:= Etype
(Rop
);
5041 Typ
: Entity_Id
:= Etype
(N
);
5044 Binary_Op_Validity_Checks
(N
);
5046 -- Special optimizations for integer types
5048 if Is_Integer_Type
(Typ
) then
5050 -- N * 0 = 0 * N = 0 for integer types
5052 if (Compile_Time_Known_Value
(Rop
)
5053 and then Expr_Value
(Rop
) = Uint_0
)
5055 (Compile_Time_Known_Value
(Lop
)
5056 and then Expr_Value
(Lop
) = Uint_0
)
5058 Rewrite
(N
, Make_Integer_Literal
(Loc
, Uint_0
));
5059 Analyze_And_Resolve
(N
, Typ
);
5063 -- N * 1 = 1 * N = N for integer types
5065 -- This optimisation is not done if we are going to
5066 -- rewrite the product 1 * 2 ** N to a shift.
5068 if Compile_Time_Known_Value
(Rop
)
5069 and then Expr_Value
(Rop
) = Uint_1
5075 elsif Compile_Time_Known_Value
(Lop
)
5076 and then Expr_Value
(Lop
) = Uint_1
5084 -- Deal with VAX float case
5086 if Vax_Float
(Typ
) then
5087 Expand_Vax_Arith
(N
);
5091 -- Convert x * 2 ** y to Shift_Left (x, y). Note that the fact that
5092 -- Is_Power_Of_2_For_Shift is set means that we know that our left
5093 -- operand is an integer, as required for this to work.
5098 -- Convert 2 ** A * 2 ** B into 2 ** (A + B)
5102 Left_Opnd
=> Make_Integer_Literal
(Loc
, 2),
5105 Left_Opnd
=> Right_Opnd
(Lop
),
5106 Right_Opnd
=> Right_Opnd
(Rop
))));
5107 Analyze_And_Resolve
(N
, Typ
);
5112 Make_Op_Shift_Left
(Loc
,
5115 Convert_To
(Standard_Natural
, Right_Opnd
(Rop
))));
5116 Analyze_And_Resolve
(N
, Typ
);
5120 -- Same processing for the operands the other way round
5124 Make_Op_Shift_Left
(Loc
,
5127 Convert_To
(Standard_Natural
, Right_Opnd
(Lop
))));
5128 Analyze_And_Resolve
(N
, Typ
);
5132 -- Do required fixup of universal fixed operation
5134 if Typ
= Universal_Fixed
then
5135 Fixup_Universal_Fixed_Operation
(N
);
5139 -- Multiplications with fixed-point results
5141 if Is_Fixed_Point_Type
(Typ
) then
5143 -- No special processing if Treat_Fixed_As_Integer is set,
5144 -- since from a semantic point of view such operations are
5145 -- simply integer operations and will be treated that way.
5147 if not Treat_Fixed_As_Integer
(N
) then
5149 -- Case of fixed * integer => fixed
5151 if Is_Integer_Type
(Rtyp
) then
5152 Expand_Multiply_Fixed_By_Integer_Giving_Fixed
(N
);
5154 -- Case of integer * fixed => fixed
5156 elsif Is_Integer_Type
(Ltyp
) then
5157 Expand_Multiply_Integer_By_Fixed_Giving_Fixed
(N
);
5159 -- Case of fixed * fixed => fixed
5162 Expand_Multiply_Fixed_By_Fixed_Giving_Fixed
(N
);
5166 -- Other cases of multiplication of fixed-point operands. Again
5167 -- we exclude the cases where Treat_Fixed_As_Integer flag is set.
5169 elsif (Is_Fixed_Point_Type
(Ltyp
) or else Is_Fixed_Point_Type
(Rtyp
))
5170 and then not Treat_Fixed_As_Integer
(N
)
5172 if Is_Integer_Type
(Typ
) then
5173 Expand_Multiply_Fixed_By_Fixed_Giving_Integer
(N
);
5175 pragma Assert
(Is_Floating_Point_Type
(Typ
));
5176 Expand_Multiply_Fixed_By_Fixed_Giving_Float
(N
);
5179 -- Mixed-mode operations can appear in a non-static universal
5180 -- context, in which case the integer argument must be converted
5183 elsif Typ
= Universal_Real
5184 and then Is_Integer_Type
(Rtyp
)
5186 Rewrite
(Rop
, Convert_To
(Universal_Real
, Relocate_Node
(Rop
)));
5188 Analyze_And_Resolve
(Rop
, Universal_Real
);
5190 elsif Typ
= Universal_Real
5191 and then Is_Integer_Type
(Ltyp
)
5193 Rewrite
(Lop
, Convert_To
(Universal_Real
, Relocate_Node
(Lop
)));
5195 Analyze_And_Resolve
(Lop
, Universal_Real
);
5197 -- Non-fixed point cases, check software overflow checking required
5199 elsif Is_Signed_Integer_Type
(Etype
(N
)) then
5200 Apply_Arithmetic_Overflow_Check
(N
);
5202 end Expand_N_Op_Multiply
;
5204 --------------------
5205 -- Expand_N_Op_Ne --
5206 --------------------
5208 -- Rewrite node as the negation of an equality operation, and reanalyze.
5209 -- The equality to be used is defined in the same scope and has the same
5210 -- signature. It must be set explicitly because in an instance it may not
5211 -- have the same visibility as in the generic unit.
5213 procedure Expand_N_Op_Ne
(N
: Node_Id
) is
5214 Loc
: constant Source_Ptr
:= Sloc
(N
);
5216 Ne
: constant Entity_Id
:= Entity
(N
);
5219 Binary_Op_Validity_Checks
(N
);
5225 Left_Opnd
=> Left_Opnd
(N
),
5226 Right_Opnd
=> Right_Opnd
(N
)));
5227 Set_Paren_Count
(Right_Opnd
(Neg
), 1);
5229 if Scope
(Ne
) /= Standard_Standard
then
5230 Set_Entity
(Right_Opnd
(Neg
), Corresponding_Equality
(Ne
));
5233 -- For navigation purposes, the inequality is treated as an implicit
5234 -- reference to the corresponding equality. Preserve the Comes_From_
5235 -- source flag so that the proper Xref entry is generated.
5237 Preserve_Comes_From_Source
(Neg
, N
);
5238 Preserve_Comes_From_Source
(Right_Opnd
(Neg
), N
);
5240 Analyze_And_Resolve
(N
, Standard_Boolean
);
5243 ---------------------
5244 -- Expand_N_Op_Not --
5245 ---------------------
5247 -- If the argument is other than a Boolean array type, there is no
5248 -- special expansion required.
5250 -- For the packed case, we call the special routine in Exp_Pakd, except
5251 -- that if the component size is greater than one, we use the standard
5252 -- routine generating a gruesome loop (it is so peculiar to have packed
5253 -- arrays with non-standard Boolean representations anyway, so it does
5254 -- not matter that we do not handle this case efficiently).
5256 -- For the unpacked case (and for the special packed case where we have
5257 -- non standard Booleans, as discussed above), we generate and insert
5258 -- into the tree the following function definition:
5260 -- function Nnnn (A : arr) is
5263 -- for J in a'range loop
5264 -- B (J) := not A (J);
5269 -- Here arr is the actual subtype of the parameter (and hence always
5270 -- constrained). Then we replace the not with a call to this function.
5272 procedure Expand_N_Op_Not
(N
: Node_Id
) is
5273 Loc
: constant Source_Ptr
:= Sloc
(N
);
5274 Typ
: constant Entity_Id
:= Etype
(N
);
5283 Func_Name
: Entity_Id
;
5284 Loop_Statement
: Node_Id
;
5287 Unary_Op_Validity_Checks
(N
);
5289 -- For boolean operand, deal with non-standard booleans
5291 if Is_Boolean_Type
(Typ
) then
5292 Adjust_Condition
(Right_Opnd
(N
));
5293 Set_Etype
(N
, Standard_Boolean
);
5294 Adjust_Result_Type
(N
, Typ
);
5298 -- Only array types need any other processing
5300 if not Is_Array_Type
(Typ
) then
5304 -- Case of array operand. If bit packed with a component size of 1,
5305 -- handle it in Exp_Pakd if the operand is known to be aligned.
5307 if Is_Bit_Packed_Array
(Typ
)
5308 and then Component_Size
(Typ
) = 1
5309 and then not Is_Possibly_Unaligned_Object
(Right_Opnd
(N
))
5311 Expand_Packed_Not
(N
);
5315 -- Case of array operand which is not bit-packed. If the context is
5316 -- a safe assignment, call in-place operation, If context is a larger
5317 -- boolean expression in the context of a safe assignment, expansion is
5318 -- done by enclosing operation.
5320 Opnd
:= Relocate_Node
(Right_Opnd
(N
));
5321 Convert_To_Actual_Subtype
(Opnd
);
5322 Arr
:= Etype
(Opnd
);
5323 Ensure_Defined
(Arr
, N
);
5325 if Nkind
(Parent
(N
)) = N_Assignment_Statement
then
5326 if Safe_In_Place_Array_Op
(Name
(Parent
(N
)), N
, Empty
) then
5327 Build_Boolean_Array_Proc_Call
(Parent
(N
), Opnd
, Empty
);
5330 -- Special case the negation of a binary operation
5332 elsif (Nkind
(Opnd
) = N_Op_And
5333 or else Nkind
(Opnd
) = N_Op_Or
5334 or else Nkind
(Opnd
) = N_Op_Xor
)
5335 and then Safe_In_Place_Array_Op
5336 (Name
(Parent
(N
)), Left_Opnd
(Opnd
), Right_Opnd
(Opnd
))
5338 Build_Boolean_Array_Proc_Call
(Parent
(N
), Opnd
, Empty
);
5342 elsif Nkind
(Parent
(N
)) in N_Binary_Op
5343 and then Nkind
(Parent
(Parent
(N
))) = N_Assignment_Statement
5346 Op1
: constant Node_Id
:= Left_Opnd
(Parent
(N
));
5347 Op2
: constant Node_Id
:= Right_Opnd
(Parent
(N
));
5348 Lhs
: constant Node_Id
:= Name
(Parent
(Parent
(N
)));
5351 if Safe_In_Place_Array_Op
(Lhs
, Op1
, Op2
) then
5353 and then Nkind
(Op2
) = N_Op_Not
5355 -- (not A) op (not B) can be reduced to a single call
5360 and then Nkind
(Parent
(N
)) = N_Op_Xor
5362 -- A xor (not B) can also be special-cased
5370 A
:= Make_Defining_Identifier
(Loc
, Name_uA
);
5371 B
:= Make_Defining_Identifier
(Loc
, Name_uB
);
5372 J
:= Make_Defining_Identifier
(Loc
, Name_uJ
);
5375 Make_Indexed_Component
(Loc
,
5376 Prefix
=> New_Reference_To
(A
, Loc
),
5377 Expressions
=> New_List
(New_Reference_To
(J
, Loc
)));
5380 Make_Indexed_Component
(Loc
,
5381 Prefix
=> New_Reference_To
(B
, Loc
),
5382 Expressions
=> New_List
(New_Reference_To
(J
, Loc
)));
5385 Make_Implicit_Loop_Statement
(N
,
5386 Identifier
=> Empty
,
5389 Make_Iteration_Scheme
(Loc
,
5390 Loop_Parameter_Specification
=>
5391 Make_Loop_Parameter_Specification
(Loc
,
5392 Defining_Identifier
=> J
,
5393 Discrete_Subtype_Definition
=>
5394 Make_Attribute_Reference
(Loc
,
5395 Prefix
=> Make_Identifier
(Loc
, Chars
(A
)),
5396 Attribute_Name
=> Name_Range
))),
5398 Statements
=> New_List
(
5399 Make_Assignment_Statement
(Loc
,
5401 Expression
=> Make_Op_Not
(Loc
, A_J
))));
5403 Func_Name
:= Make_Defining_Identifier
(Loc
, New_Internal_Name
('N'));
5404 Set_Is_Inlined
(Func_Name
);
5407 Make_Subprogram_Body
(Loc
,
5409 Make_Function_Specification
(Loc
,
5410 Defining_Unit_Name
=> Func_Name
,
5411 Parameter_Specifications
=> New_List
(
5412 Make_Parameter_Specification
(Loc
,
5413 Defining_Identifier
=> A
,
5414 Parameter_Type
=> New_Reference_To
(Typ
, Loc
))),
5415 Subtype_Mark
=> New_Reference_To
(Typ
, Loc
)),
5417 Declarations
=> New_List
(
5418 Make_Object_Declaration
(Loc
,
5419 Defining_Identifier
=> B
,
5420 Object_Definition
=> New_Reference_To
(Arr
, Loc
))),
5422 Handled_Statement_Sequence
=>
5423 Make_Handled_Sequence_Of_Statements
(Loc
,
5424 Statements
=> New_List
(
5426 Make_Return_Statement
(Loc
,
5428 Make_Identifier
(Loc
, Chars
(B
)))))));
5431 Make_Function_Call
(Loc
,
5432 Name
=> New_Reference_To
(Func_Name
, Loc
),
5433 Parameter_Associations
=> New_List
(Opnd
)));
5435 Analyze_And_Resolve
(N
, Typ
);
5436 end Expand_N_Op_Not
;
5438 --------------------
5439 -- Expand_N_Op_Or --
5440 --------------------
5442 procedure Expand_N_Op_Or
(N
: Node_Id
) is
5443 Typ
: constant Entity_Id
:= Etype
(N
);
5446 Binary_Op_Validity_Checks
(N
);
5448 if Is_Array_Type
(Etype
(N
)) then
5449 Expand_Boolean_Operator
(N
);
5451 elsif Is_Boolean_Type
(Etype
(N
)) then
5452 Adjust_Condition
(Left_Opnd
(N
));
5453 Adjust_Condition
(Right_Opnd
(N
));
5454 Set_Etype
(N
, Standard_Boolean
);
5455 Adjust_Result_Type
(N
, Typ
);
5459 ----------------------
5460 -- Expand_N_Op_Plus --
5461 ----------------------
5463 procedure Expand_N_Op_Plus
(N
: Node_Id
) is
5465 Unary_Op_Validity_Checks
(N
);
5466 end Expand_N_Op_Plus
;
5468 ---------------------
5469 -- Expand_N_Op_Rem --
5470 ---------------------
5472 procedure Expand_N_Op_Rem
(N
: Node_Id
) is
5473 Loc
: constant Source_Ptr
:= Sloc
(N
);
5474 Typ
: constant Entity_Id
:= Etype
(N
);
5476 Left
: constant Node_Id
:= Left_Opnd
(N
);
5477 Right
: constant Node_Id
:= Right_Opnd
(N
);
5488 Binary_Op_Validity_Checks
(N
);
5490 if Is_Integer_Type
(Etype
(N
)) then
5491 Apply_Divide_Check
(N
);
5494 -- Apply optimization x rem 1 = 0. We don't really need that with
5495 -- gcc, but it is useful with other back ends (e.g. AAMP), and is
5496 -- certainly harmless.
5498 if Is_Integer_Type
(Etype
(N
))
5499 and then Compile_Time_Known_Value
(Right
)
5500 and then Expr_Value
(Right
) = Uint_1
5502 Rewrite
(N
, Make_Integer_Literal
(Loc
, 0));
5503 Analyze_And_Resolve
(N
, Typ
);
5507 -- Deal with annoying case of largest negative number remainder
5508 -- minus one. Gigi does not handle this case correctly, because
5509 -- it generates a divide instruction which may trap in this case.
5511 -- In fact the check is quite easy, if the right operand is -1,
5512 -- then the remainder is always 0, and we can just ignore the
5513 -- left operand completely in this case.
5515 Determine_Range
(Right
, ROK
, Rlo
, Rhi
);
5516 Determine_Range
(Left
, LOK
, Llo
, Lhi
);
5518 -- The operand type may be private (e.g. in the expansion of an
5519 -- an intrinsic operation) so we must use the underlying type to
5520 -- get the bounds, and convert the literals explicitly.
5524 (Type_Low_Bound
(Base_Type
(Underlying_Type
(Etype
(Left
)))));
5526 -- Now perform the test, generating code only if needed
5528 if ((not ROK
) or else (Rlo
<= (-1) and then (-1) <= Rhi
))
5530 ((not LOK
) or else (Llo
= LLB
))
5533 Make_Conditional_Expression
(Loc
,
5534 Expressions
=> New_List
(
5536 Left_Opnd
=> Duplicate_Subexpr
(Right
),
5538 Unchecked_Convert_To
(Typ
,
5539 Make_Integer_Literal
(Loc
, -1))),
5541 Unchecked_Convert_To
(Typ
,
5542 Make_Integer_Literal
(Loc
, Uint_0
)),
5544 Relocate_Node
(N
))));
5546 Set_Analyzed
(Next
(Next
(First
(Expressions
(N
)))));
5547 Analyze_And_Resolve
(N
, Typ
);
5549 end Expand_N_Op_Rem
;
5551 -----------------------------
5552 -- Expand_N_Op_Rotate_Left --
5553 -----------------------------
5555 procedure Expand_N_Op_Rotate_Left
(N
: Node_Id
) is
5557 Binary_Op_Validity_Checks
(N
);
5558 end Expand_N_Op_Rotate_Left
;
5560 ------------------------------
5561 -- Expand_N_Op_Rotate_Right --
5562 ------------------------------
5564 procedure Expand_N_Op_Rotate_Right
(N
: Node_Id
) is
5566 Binary_Op_Validity_Checks
(N
);
5567 end Expand_N_Op_Rotate_Right
;
5569 ----------------------------
5570 -- Expand_N_Op_Shift_Left --
5571 ----------------------------
5573 procedure Expand_N_Op_Shift_Left
(N
: Node_Id
) is
5575 Binary_Op_Validity_Checks
(N
);
5576 end Expand_N_Op_Shift_Left
;
5578 -----------------------------
5579 -- Expand_N_Op_Shift_Right --
5580 -----------------------------
5582 procedure Expand_N_Op_Shift_Right
(N
: Node_Id
) is
5584 Binary_Op_Validity_Checks
(N
);
5585 end Expand_N_Op_Shift_Right
;
5587 ----------------------------------------
5588 -- Expand_N_Op_Shift_Right_Arithmetic --
5589 ----------------------------------------
5591 procedure Expand_N_Op_Shift_Right_Arithmetic
(N
: Node_Id
) is
5593 Binary_Op_Validity_Checks
(N
);
5594 end Expand_N_Op_Shift_Right_Arithmetic
;
5596 --------------------------
5597 -- Expand_N_Op_Subtract --
5598 --------------------------
5600 procedure Expand_N_Op_Subtract
(N
: Node_Id
) is
5601 Typ
: constant Entity_Id
:= Etype
(N
);
5604 Binary_Op_Validity_Checks
(N
);
5606 -- N - 0 = N for integer types
5608 if Is_Integer_Type
(Typ
)
5609 and then Compile_Time_Known_Value
(Right_Opnd
(N
))
5610 and then Expr_Value
(Right_Opnd
(N
)) = 0
5612 Rewrite
(N
, Left_Opnd
(N
));
5616 -- Arithemtic overflow checks for signed integer/fixed point types
5618 if Is_Signed_Integer_Type
(Typ
)
5619 or else Is_Fixed_Point_Type
(Typ
)
5621 Apply_Arithmetic_Overflow_Check
(N
);
5623 -- Vax floating-point types case
5625 elsif Vax_Float
(Typ
) then
5626 Expand_Vax_Arith
(N
);
5628 end Expand_N_Op_Subtract
;
5630 ---------------------
5631 -- Expand_N_Op_Xor --
5632 ---------------------
5634 procedure Expand_N_Op_Xor
(N
: Node_Id
) is
5635 Typ
: constant Entity_Id
:= Etype
(N
);
5638 Binary_Op_Validity_Checks
(N
);
5640 if Is_Array_Type
(Etype
(N
)) then
5641 Expand_Boolean_Operator
(N
);
5643 elsif Is_Boolean_Type
(Etype
(N
)) then
5644 Adjust_Condition
(Left_Opnd
(N
));
5645 Adjust_Condition
(Right_Opnd
(N
));
5646 Set_Etype
(N
, Standard_Boolean
);
5647 Adjust_Result_Type
(N
, Typ
);
5649 end Expand_N_Op_Xor
;
5651 ----------------------
5652 -- Expand_N_Or_Else --
5653 ----------------------
5655 -- Expand into conditional expression if Actions present, and also
5656 -- deal with optimizing case of arguments being True or False.
5658 procedure Expand_N_Or_Else
(N
: Node_Id
) is
5659 Loc
: constant Source_Ptr
:= Sloc
(N
);
5660 Typ
: constant Entity_Id
:= Etype
(N
);
5661 Left
: constant Node_Id
:= Left_Opnd
(N
);
5662 Right
: constant Node_Id
:= Right_Opnd
(N
);
5666 -- Deal with non-standard booleans
5668 if Is_Boolean_Type
(Typ
) then
5669 Adjust_Condition
(Left
);
5670 Adjust_Condition
(Right
);
5671 Set_Etype
(N
, Standard_Boolean
);
5674 -- Check for cases of left argument is True or False
5676 if Nkind
(Left
) = N_Identifier
then
5678 -- If left argument is False, change (False or else Right) to Right.
5679 -- Any actions associated with Right will be executed unconditionally
5680 -- and can thus be inserted into the tree unconditionally.
5682 if Entity
(Left
) = Standard_False
then
5683 if Present
(Actions
(N
)) then
5684 Insert_Actions
(N
, Actions
(N
));
5688 Adjust_Result_Type
(N
, Typ
);
5691 -- If left argument is True, change (True and then Right) to
5692 -- True. In this case we can forget the actions associated with
5693 -- Right, since they will never be executed.
5695 elsif Entity
(Left
) = Standard_True
then
5696 Kill_Dead_Code
(Right
);
5697 Kill_Dead_Code
(Actions
(N
));
5698 Rewrite
(N
, New_Occurrence_Of
(Standard_True
, Loc
));
5699 Adjust_Result_Type
(N
, Typ
);
5704 -- If Actions are present, we expand
5706 -- left or else right
5710 -- if left then True else right end
5712 -- with the actions becoming the Else_Actions of the conditional
5713 -- expression. This conditional expression is then further expanded
5714 -- (and will eventually disappear)
5716 if Present
(Actions
(N
)) then
5717 Actlist
:= Actions
(N
);
5719 Make_Conditional_Expression
(Loc
,
5720 Expressions
=> New_List
(
5722 New_Occurrence_Of
(Standard_True
, Loc
),
5725 Set_Else_Actions
(N
, Actlist
);
5726 Analyze_And_Resolve
(N
, Standard_Boolean
);
5727 Adjust_Result_Type
(N
, Typ
);
5731 -- No actions present, check for cases of right argument True/False
5733 if Nkind
(Right
) = N_Identifier
then
5735 -- Change (Left or else False) to Left. Note that we know there
5736 -- are no actions associated with the True operand, since we
5737 -- just checked for this case above.
5739 if Entity
(Right
) = Standard_False
then
5742 -- Change (Left or else True) to True, making sure to preserve
5743 -- any side effects associated with the Left operand.
5745 elsif Entity
(Right
) = Standard_True
then
5746 Remove_Side_Effects
(Left
);
5748 (N
, New_Occurrence_Of
(Standard_True
, Loc
));
5752 Adjust_Result_Type
(N
, Typ
);
5753 end Expand_N_Or_Else
;
5755 -----------------------------------
5756 -- Expand_N_Qualified_Expression --
5757 -----------------------------------
5759 procedure Expand_N_Qualified_Expression
(N
: Node_Id
) is
5760 Operand
: constant Node_Id
:= Expression
(N
);
5761 Target_Type
: constant Entity_Id
:= Entity
(Subtype_Mark
(N
));
5764 Apply_Constraint_Check
(Operand
, Target_Type
, No_Sliding
=> True);
5765 end Expand_N_Qualified_Expression
;
5767 ---------------------------------
5768 -- Expand_N_Selected_Component --
5769 ---------------------------------
5771 -- If the selector is a discriminant of a concurrent object, rewrite the
5772 -- prefix to denote the corresponding record type.
5774 procedure Expand_N_Selected_Component
(N
: Node_Id
) is
5775 Loc
: constant Source_Ptr
:= Sloc
(N
);
5776 Par
: constant Node_Id
:= Parent
(N
);
5777 P
: constant Node_Id
:= Prefix
(N
);
5778 Ptyp
: Entity_Id
:= Underlying_Type
(Etype
(P
));
5783 function In_Left_Hand_Side
(Comp
: Node_Id
) return Boolean;
5784 -- Gigi needs a temporary for prefixes that depend on a discriminant,
5785 -- unless the context of an assignment can provide size information.
5786 -- Don't we have a general routine that does this???
5788 -----------------------
5789 -- In_Left_Hand_Side --
5790 -----------------------
5792 function In_Left_Hand_Side
(Comp
: Node_Id
) return Boolean is
5794 return (Nkind
(Parent
(Comp
)) = N_Assignment_Statement
5795 and then Comp
= Name
(Parent
(Comp
)))
5796 or else (Present
(Parent
(Comp
))
5797 and then Nkind
(Parent
(Comp
)) in N_Subexpr
5798 and then In_Left_Hand_Side
(Parent
(Comp
)));
5799 end In_Left_Hand_Side
;
5801 -- Start of processing for Expand_N_Selected_Component
5804 -- Insert explicit dereference if required
5806 if Is_Access_Type
(Ptyp
) then
5807 Insert_Explicit_Dereference
(P
);
5808 Analyze_And_Resolve
(P
, Designated_Type
(Ptyp
));
5810 if Ekind
(Etype
(P
)) = E_Private_Subtype
5811 and then Is_For_Access_Subtype
(Etype
(P
))
5813 Set_Etype
(P
, Base_Type
(Etype
(P
)));
5819 -- Deal with discriminant check required
5821 if Do_Discriminant_Check
(N
) then
5823 -- Present the discrminant checking function to the backend,
5824 -- so that it can inline the call to the function.
5827 (Discriminant_Checking_Func
5828 (Original_Record_Component
(Entity
(Selector_Name
(N
)))));
5830 -- Now reset the flag and generate the call
5832 Set_Do_Discriminant_Check
(N
, False);
5833 Generate_Discriminant_Check
(N
);
5836 -- Gigi cannot handle unchecked conversions that are the prefix of a
5837 -- selected component with discriminants. This must be checked during
5838 -- expansion, because during analysis the type of the selector is not
5839 -- known at the point the prefix is analyzed. If the conversion is the
5840 -- target of an assignment, then we cannot force the evaluation.
5842 if Nkind
(Prefix
(N
)) = N_Unchecked_Type_Conversion
5843 and then Has_Discriminants
(Etype
(N
))
5844 and then not In_Left_Hand_Side
(N
)
5846 Force_Evaluation
(Prefix
(N
));
5849 -- Remaining processing applies only if selector is a discriminant
5851 if Ekind
(Entity
(Selector_Name
(N
))) = E_Discriminant
then
5853 -- If the selector is a discriminant of a constrained record type,
5854 -- we may be able to rewrite the expression with the actual value
5855 -- of the discriminant, a useful optimization in some cases.
5857 if Is_Record_Type
(Ptyp
)
5858 and then Has_Discriminants
(Ptyp
)
5859 and then Is_Constrained
(Ptyp
)
5861 -- Do this optimization for discrete types only, and not for
5862 -- access types (access discriminants get us into trouble!)
5864 if not Is_Discrete_Type
(Etype
(N
)) then
5867 -- Don't do this on the left hand of an assignment statement.
5868 -- Normally one would think that references like this would
5869 -- not occur, but they do in generated code, and mean that
5870 -- we really do want to assign the discriminant!
5872 elsif Nkind
(Par
) = N_Assignment_Statement
5873 and then Name
(Par
) = N
5877 -- Don't do this optimization for the prefix of an attribute
5878 -- or the operand of an object renaming declaration since these
5879 -- are contexts where we do not want the value anyway.
5881 elsif (Nkind
(Par
) = N_Attribute_Reference
5882 and then Prefix
(Par
) = N
)
5883 or else Is_Renamed_Object
(N
)
5887 -- Don't do this optimization if we are within the code for a
5888 -- discriminant check, since the whole point of such a check may
5889 -- be to verify the condition on which the code below depends!
5891 elsif Is_In_Discriminant_Check
(N
) then
5894 -- Green light to see if we can do the optimization. There is
5895 -- still one condition that inhibits the optimization below
5896 -- but now is the time to check the particular discriminant.
5899 -- Loop through discriminants to find the matching
5900 -- discriminant constraint to see if we can copy it.
5902 Disc
:= First_Discriminant
(Ptyp
);
5903 Dcon
:= First_Elmt
(Discriminant_Constraint
(Ptyp
));
5904 Discr_Loop
: while Present
(Dcon
) loop
5906 -- Check if this is the matching discriminant
5908 if Disc
= Entity
(Selector_Name
(N
)) then
5910 -- Here we have the matching discriminant. Check for
5911 -- the case of a discriminant of a component that is
5912 -- constrained by an outer discriminant, which cannot
5913 -- be optimized away.
5916 Denotes_Discriminant
5917 (Node
(Dcon
), Check_Protected
=> True)
5921 -- In the context of a case statement, the expression
5922 -- may have the base type of the discriminant, and we
5923 -- need to preserve the constraint to avoid spurious
5924 -- errors on missing cases.
5926 elsif Nkind
(Parent
(N
)) = N_Case_Statement
5927 and then Etype
(Node
(Dcon
)) /= Etype
(Disc
)
5930 Make_Qualified_Expression
(Loc
,
5932 New_Occurrence_Of
(Etype
(Disc
), Loc
),
5934 New_Copy_Tree
(Node
(Dcon
))));
5935 Analyze_And_Resolve
(N
, Etype
(Disc
));
5937 -- In case that comes out as a static expression,
5938 -- reset it (a selected component is never static).
5940 Set_Is_Static_Expression
(N
, False);
5943 -- Otherwise we can just copy the constraint, but the
5944 -- result is certainly not static! In some cases the
5945 -- discriminant constraint has been analyzed in the
5946 -- context of the original subtype indication, but for
5947 -- itypes the constraint might not have been analyzed
5948 -- yet, and this must be done now.
5951 Rewrite
(N
, New_Copy_Tree
(Node
(Dcon
)));
5952 Analyze_And_Resolve
(N
);
5953 Set_Is_Static_Expression
(N
, False);
5959 Next_Discriminant
(Disc
);
5960 end loop Discr_Loop
;
5962 -- Note: the above loop should always find a matching
5963 -- discriminant, but if it does not, we just missed an
5964 -- optimization due to some glitch (perhaps a previous
5965 -- error), so ignore.
5970 -- The only remaining processing is in the case of a discriminant of
5971 -- a concurrent object, where we rewrite the prefix to denote the
5972 -- corresponding record type. If the type is derived and has renamed
5973 -- discriminants, use corresponding discriminant, which is the one
5974 -- that appears in the corresponding record.
5976 if not Is_Concurrent_Type
(Ptyp
) then
5980 Disc
:= Entity
(Selector_Name
(N
));
5982 if Is_Derived_Type
(Ptyp
)
5983 and then Present
(Corresponding_Discriminant
(Disc
))
5985 Disc
:= Corresponding_Discriminant
(Disc
);
5989 Make_Selected_Component
(Loc
,
5991 Unchecked_Convert_To
(Corresponding_Record_Type
(Ptyp
),
5993 Selector_Name
=> Make_Identifier
(Loc
, Chars
(Disc
)));
5998 end Expand_N_Selected_Component
;
6000 --------------------
6001 -- Expand_N_Slice --
6002 --------------------
6004 procedure Expand_N_Slice
(N
: Node_Id
) is
6005 Loc
: constant Source_Ptr
:= Sloc
(N
);
6006 Typ
: constant Entity_Id
:= Etype
(N
);
6007 Pfx
: constant Node_Id
:= Prefix
(N
);
6008 Ptp
: Entity_Id
:= Etype
(Pfx
);
6010 function Is_Procedure_Actual
(N
: Node_Id
) return Boolean;
6011 -- Check whether the argument is an actual for a procedure call,
6012 -- in which case the expansion of a bit-packed slice is deferred
6013 -- until the call itself is expanded. The reason this is required
6014 -- is that we might have an IN OUT or OUT parameter, and the copy out
6015 -- is essential, and that copy out would be missed if we created a
6016 -- temporary here in Expand_N_Slice. Note that we don't bother
6017 -- to test specifically for an IN OUT or OUT mode parameter, since it
6018 -- is a bit tricky to do, and it is harmless to defer expansion
6019 -- in the IN case, since the call processing will still generate the
6020 -- appropriate copy in operation, which will take care of the slice.
6022 procedure Make_Temporary
;
6023 -- Create a named variable for the value of the slice, in
6024 -- cases where the back-end cannot handle it properly, e.g.
6025 -- when packed types or unaligned slices are involved.
6027 -------------------------
6028 -- Is_Procedure_Actual --
6029 -------------------------
6031 function Is_Procedure_Actual
(N
: Node_Id
) return Boolean is
6032 Par
: Node_Id
:= Parent
(N
);
6036 -- If our parent is a procedure call we can return
6038 if Nkind
(Par
) = N_Procedure_Call_Statement
then
6041 -- If our parent is a type conversion, keep climbing the
6042 -- tree, since a type conversion can be a procedure actual.
6043 -- Also keep climbing if parameter association or a qualified
6044 -- expression, since these are additional cases that do can
6045 -- appear on procedure actuals.
6047 elsif Nkind
(Par
) = N_Type_Conversion
6048 or else Nkind
(Par
) = N_Parameter_Association
6049 or else Nkind
(Par
) = N_Qualified_Expression
6051 Par
:= Parent
(Par
);
6053 -- Any other case is not what we are looking for
6059 end Is_Procedure_Actual
;
6061 --------------------
6062 -- Make_Temporary --
6063 --------------------
6065 procedure Make_Temporary
is
6067 Ent
: constant Entity_Id
:=
6068 Make_Defining_Identifier
(Loc
, New_Internal_Name
('T'));
6071 Make_Object_Declaration
(Loc
,
6072 Defining_Identifier
=> Ent
,
6073 Object_Definition
=> New_Occurrence_Of
(Typ
, Loc
));
6075 Set_No_Initialization
(Decl
);
6077 Insert_Actions
(N
, New_List
(
6079 Make_Assignment_Statement
(Loc
,
6080 Name
=> New_Occurrence_Of
(Ent
, Loc
),
6081 Expression
=> Relocate_Node
(N
))));
6083 Rewrite
(N
, New_Occurrence_Of
(Ent
, Loc
));
6084 Analyze_And_Resolve
(N
, Typ
);
6087 -- Start of processing for Expand_N_Slice
6090 -- Special handling for access types
6092 if Is_Access_Type
(Ptp
) then
6094 Ptp
:= Designated_Type
(Ptp
);
6097 Make_Explicit_Dereference
(Sloc
(N
),
6098 Prefix
=> Relocate_Node
(Pfx
)));
6100 Analyze_And_Resolve
(Pfx
, Ptp
);
6103 -- Range checks are potentially also needed for cases involving
6104 -- a slice indexed by a subtype indication, but Do_Range_Check
6105 -- can currently only be set for expressions ???
6107 if not Index_Checks_Suppressed
(Ptp
)
6108 and then (not Is_Entity_Name
(Pfx
)
6109 or else not Index_Checks_Suppressed
(Entity
(Pfx
)))
6110 and then Nkind
(Discrete_Range
(N
)) /= N_Subtype_Indication
6112 Enable_Range_Check
(Discrete_Range
(N
));
6115 -- The remaining case to be handled is packed slices. We can leave
6116 -- packed slices as they are in the following situations:
6118 -- 1. Right or left side of an assignment (we can handle this
6119 -- situation correctly in the assignment statement expansion).
6121 -- 2. Prefix of indexed component (the slide is optimized away
6122 -- in this case, see the start of Expand_N_Slice.
6124 -- 3. Object renaming declaration, since we want the name of
6125 -- the slice, not the value.
6127 -- 4. Argument to procedure call, since copy-in/copy-out handling
6128 -- may be required, and this is handled in the expansion of
6131 -- 5. Prefix of an address attribute (this is an error which
6132 -- is caught elsewhere, and the expansion would intefere
6133 -- with generating the error message).
6135 if not Is_Packed
(Typ
) then
6137 -- Apply transformation for actuals of a function call,
6138 -- where Expand_Actuals is not used.
6140 if Nkind
(Parent
(N
)) = N_Function_Call
6141 and then Is_Possibly_Unaligned_Slice
(N
)
6146 elsif Nkind
(Parent
(N
)) = N_Assignment_Statement
6147 or else (Nkind
(Parent
(Parent
(N
))) = N_Assignment_Statement
6148 and then Parent
(N
) = Name
(Parent
(Parent
(N
))))
6152 elsif Nkind
(Parent
(N
)) = N_Indexed_Component
6153 or else Is_Renamed_Object
(N
)
6154 or else Is_Procedure_Actual
(N
)
6158 elsif Nkind
(Parent
(N
)) = N_Attribute_Reference
6159 and then Attribute_Name
(Parent
(N
)) = Name_Address
6168 ------------------------------
6169 -- Expand_N_Type_Conversion --
6170 ------------------------------
6172 procedure Expand_N_Type_Conversion
(N
: Node_Id
) is
6173 Loc
: constant Source_Ptr
:= Sloc
(N
);
6174 Operand
: constant Node_Id
:= Expression
(N
);
6175 Target_Type
: constant Entity_Id
:= Etype
(N
);
6176 Operand_Type
: Entity_Id
:= Etype
(Operand
);
6178 procedure Handle_Changed_Representation
;
6179 -- This is called in the case of record and array type conversions
6180 -- to see if there is a change of representation to be handled.
6181 -- Change of representation is actually handled at the assignment
6182 -- statement level, and what this procedure does is rewrite node N
6183 -- conversion as an assignment to temporary. If there is no change
6184 -- of representation, then the conversion node is unchanged.
6186 procedure Real_Range_Check
;
6187 -- Handles generation of range check for real target value
6189 -----------------------------------
6190 -- Handle_Changed_Representation --
6191 -----------------------------------
6193 procedure Handle_Changed_Representation
is
6202 -- Nothing to do if no change of representation
6204 if Same_Representation
(Operand_Type
, Target_Type
) then
6207 -- The real change of representation work is done by the assignment
6208 -- statement processing. So if this type conversion is appearing as
6209 -- the expression of an assignment statement, nothing needs to be
6210 -- done to the conversion.
6212 elsif Nkind
(Parent
(N
)) = N_Assignment_Statement
then
6215 -- Otherwise we need to generate a temporary variable, and do the
6216 -- change of representation assignment into that temporary variable.
6217 -- The conversion is then replaced by a reference to this variable.
6222 -- If type is unconstrained we have to add a constraint,
6223 -- copied from the actual value of the left hand side.
6225 if not Is_Constrained
(Target_Type
) then
6226 if Has_Discriminants
(Operand_Type
) then
6227 Disc
:= First_Discriminant
(Operand_Type
);
6229 if Disc
/= First_Stored_Discriminant
(Operand_Type
) then
6230 Disc
:= First_Stored_Discriminant
(Operand_Type
);
6234 while Present
(Disc
) loop
6236 Make_Selected_Component
(Loc
,
6237 Prefix
=> Duplicate_Subexpr_Move_Checks
(Operand
),
6239 Make_Identifier
(Loc
, Chars
(Disc
))));
6240 Next_Discriminant
(Disc
);
6243 elsif Is_Array_Type
(Operand_Type
) then
6244 N_Ix
:= First_Index
(Target_Type
);
6247 for J
in 1 .. Number_Dimensions
(Operand_Type
) loop
6249 -- We convert the bounds explicitly. We use an unchecked
6250 -- conversion because bounds checks are done elsewhere.
6255 Unchecked_Convert_To
(Etype
(N_Ix
),
6256 Make_Attribute_Reference
(Loc
,
6258 Duplicate_Subexpr_No_Checks
6259 (Operand
, Name_Req
=> True),
6260 Attribute_Name
=> Name_First
,
6261 Expressions
=> New_List
(
6262 Make_Integer_Literal
(Loc
, J
)))),
6265 Unchecked_Convert_To
(Etype
(N_Ix
),
6266 Make_Attribute_Reference
(Loc
,
6268 Duplicate_Subexpr_No_Checks
6269 (Operand
, Name_Req
=> True),
6270 Attribute_Name
=> Name_Last
,
6271 Expressions
=> New_List
(
6272 Make_Integer_Literal
(Loc
, J
))))));
6279 Odef
:= New_Occurrence_Of
(Target_Type
, Loc
);
6281 if Present
(Cons
) then
6283 Make_Subtype_Indication
(Loc
,
6284 Subtype_Mark
=> Odef
,
6286 Make_Index_Or_Discriminant_Constraint
(Loc
,
6287 Constraints
=> Cons
));
6290 Temp
:= Make_Defining_Identifier
(Loc
, New_Internal_Name
('C'));
6292 Make_Object_Declaration
(Loc
,
6293 Defining_Identifier
=> Temp
,
6294 Object_Definition
=> Odef
);
6296 Set_No_Initialization
(Decl
, True);
6298 -- Insert required actions. It is essential to suppress checks
6299 -- since we have suppressed default initialization, which means
6300 -- that the variable we create may have no discriminants.
6305 Make_Assignment_Statement
(Loc
,
6306 Name
=> New_Occurrence_Of
(Temp
, Loc
),
6307 Expression
=> Relocate_Node
(N
))),
6308 Suppress
=> All_Checks
);
6310 Rewrite
(N
, New_Occurrence_Of
(Temp
, Loc
));
6313 end Handle_Changed_Representation
;
6315 ----------------------
6316 -- Real_Range_Check --
6317 ----------------------
6319 -- Case of conversions to floating-point or fixed-point. If range
6320 -- checks are enabled and the target type has a range constraint,
6327 -- Tnn : typ'Base := typ'Base (x);
6328 -- [constraint_error when Tnn < typ'First or else Tnn > typ'Last]
6331 -- This is necessary when there is a conversion of integer to float
6332 -- or to fixed-point to ensure that the correct checks are made. It
6333 -- is not necessary for float to float where it is enough to simply
6334 -- set the Do_Range_Check flag.
6336 procedure Real_Range_Check
is
6337 Btyp
: constant Entity_Id
:= Base_Type
(Target_Type
);
6338 Lo
: constant Node_Id
:= Type_Low_Bound
(Target_Type
);
6339 Hi
: constant Node_Id
:= Type_High_Bound
(Target_Type
);
6340 Xtyp
: constant Entity_Id
:= Etype
(Operand
);
6345 -- Nothing to do if conversion was rewritten
6347 if Nkind
(N
) /= N_Type_Conversion
then
6351 -- Nothing to do if range checks suppressed, or target has the
6352 -- same range as the base type (or is the base type).
6354 if Range_Checks_Suppressed
(Target_Type
)
6355 or else (Lo
= Type_Low_Bound
(Btyp
)
6357 Hi
= Type_High_Bound
(Btyp
))
6362 -- Nothing to do if expression is an entity on which checks
6363 -- have been suppressed.
6365 if Is_Entity_Name
(Operand
)
6366 and then Range_Checks_Suppressed
(Entity
(Operand
))
6371 -- Nothing to do if bounds are all static and we can tell that
6372 -- the expression is within the bounds of the target. Note that
6373 -- if the operand is of an unconstrained floating-point type,
6374 -- then we do not trust it to be in range (might be infinite)
6377 S_Lo
: constant Node_Id
:= Type_Low_Bound
(Xtyp
);
6378 S_Hi
: constant Node_Id
:= Type_High_Bound
(Xtyp
);
6381 if (not Is_Floating_Point_Type
(Xtyp
)
6382 or else Is_Constrained
(Xtyp
))
6383 and then Compile_Time_Known_Value
(S_Lo
)
6384 and then Compile_Time_Known_Value
(S_Hi
)
6385 and then Compile_Time_Known_Value
(Hi
)
6386 and then Compile_Time_Known_Value
(Lo
)
6389 D_Lov
: constant Ureal
:= Expr_Value_R
(Lo
);
6390 D_Hiv
: constant Ureal
:= Expr_Value_R
(Hi
);
6395 if Is_Real_Type
(Xtyp
) then
6396 S_Lov
:= Expr_Value_R
(S_Lo
);
6397 S_Hiv
:= Expr_Value_R
(S_Hi
);
6399 S_Lov
:= UR_From_Uint
(Expr_Value
(S_Lo
));
6400 S_Hiv
:= UR_From_Uint
(Expr_Value
(S_Hi
));
6404 and then S_Lov
>= D_Lov
6405 and then S_Hiv
<= D_Hiv
6407 Set_Do_Range_Check
(Operand
, False);
6414 -- For float to float conversions, we are done
6416 if Is_Floating_Point_Type
(Xtyp
)
6418 Is_Floating_Point_Type
(Btyp
)
6423 -- Otherwise rewrite the conversion as described above
6425 Conv
:= Relocate_Node
(N
);
6427 (Subtype_Mark
(Conv
), New_Occurrence_Of
(Btyp
, Loc
));
6428 Set_Etype
(Conv
, Btyp
);
6430 -- Enable overflow except in the case of integer to float
6431 -- conversions, where it is never required, since we can
6432 -- never have overflow in this case.
6434 if not Is_Integer_Type
(Etype
(Operand
)) then
6435 Enable_Overflow_Check
(Conv
);
6439 Make_Defining_Identifier
(Loc
,
6440 Chars
=> New_Internal_Name
('T'));
6442 Insert_Actions
(N
, New_List
(
6443 Make_Object_Declaration
(Loc
,
6444 Defining_Identifier
=> Tnn
,
6445 Object_Definition
=> New_Occurrence_Of
(Btyp
, Loc
),
6446 Expression
=> Conv
),
6448 Make_Raise_Constraint_Error
(Loc
,
6453 Left_Opnd
=> New_Occurrence_Of
(Tnn
, Loc
),
6455 Make_Attribute_Reference
(Loc
,
6456 Attribute_Name
=> Name_First
,
6458 New_Occurrence_Of
(Target_Type
, Loc
))),
6462 Left_Opnd
=> New_Occurrence_Of
(Tnn
, Loc
),
6464 Make_Attribute_Reference
(Loc
,
6465 Attribute_Name
=> Name_Last
,
6467 New_Occurrence_Of
(Target_Type
, Loc
)))),
6468 Reason
=> CE_Range_Check_Failed
)));
6470 Rewrite
(N
, New_Occurrence_Of
(Tnn
, Loc
));
6471 Analyze_And_Resolve
(N
, Btyp
);
6472 end Real_Range_Check
;
6474 -- Start of processing for Expand_N_Type_Conversion
6477 -- Nothing at all to do if conversion is to the identical type
6478 -- so remove the conversion completely, it is useless.
6480 if Operand_Type
= Target_Type
then
6481 Rewrite
(N
, Relocate_Node
(Operand
));
6485 -- Deal with Vax floating-point cases
6487 if Vax_Float
(Operand_Type
) or else Vax_Float
(Target_Type
) then
6488 Expand_Vax_Conversion
(N
);
6492 -- Nothing to do if this is the second argument of read. This
6493 -- is a "backwards" conversion that will be handled by the
6494 -- specialized code in attribute processing.
6496 if Nkind
(Parent
(N
)) = N_Attribute_Reference
6497 and then Attribute_Name
(Parent
(N
)) = Name_Read
6498 and then Next
(First
(Expressions
(Parent
(N
)))) = N
6503 -- Here if we may need to expand conversion
6505 -- Special case of converting from non-standard boolean type
6507 if Is_Boolean_Type
(Operand_Type
)
6508 and then (Nonzero_Is_True
(Operand_Type
))
6510 Adjust_Condition
(Operand
);
6511 Set_Etype
(Operand
, Standard_Boolean
);
6512 Operand_Type
:= Standard_Boolean
;
6515 -- Case of converting to an access type
6517 if Is_Access_Type
(Target_Type
) then
6519 -- Apply an accessibility check if the operand is an
6520 -- access parameter. Note that other checks may still
6521 -- need to be applied below (such as tagged type checks).
6523 if Is_Entity_Name
(Operand
)
6524 and then Ekind
(Entity
(Operand
)) in Formal_Kind
6525 and then Ekind
(Etype
(Operand
)) = E_Anonymous_Access_Type
6527 Apply_Accessibility_Check
(Operand
, Target_Type
);
6529 -- If the level of the operand type is statically deeper
6530 -- then the level of the target type, then force Program_Error.
6531 -- Note that this can only occur for cases where the attribute
6532 -- is within the body of an instantiation (otherwise the
6533 -- conversion will already have been rejected as illegal).
6534 -- Note: warnings are issued by the analyzer for the instance
6537 elsif In_Instance_Body
6538 and then Type_Access_Level
(Operand_Type
) >
6539 Type_Access_Level
(Target_Type
)
6542 Make_Raise_Program_Error
(Sloc
(N
),
6543 Reason
=> PE_Accessibility_Check_Failed
));
6544 Set_Etype
(N
, Target_Type
);
6546 -- When the operand is a selected access discriminant
6547 -- the check needs to be made against the level of the
6548 -- object denoted by the prefix of the selected name.
6549 -- Force Program_Error for this case as well (this
6550 -- accessibility violation can only happen if within
6551 -- the body of an instantiation).
6553 elsif In_Instance_Body
6554 and then Ekind
(Operand_Type
) = E_Anonymous_Access_Type
6555 and then Nkind
(Operand
) = N_Selected_Component
6556 and then Object_Access_Level
(Operand
) >
6557 Type_Access_Level
(Target_Type
)
6560 Make_Raise_Program_Error
(Sloc
(N
),
6561 Reason
=> PE_Accessibility_Check_Failed
));
6562 Set_Etype
(N
, Target_Type
);
6566 -- Case of conversions of tagged types and access to tagged types
6568 -- When needed, that is to say when the expression is class-wide,
6569 -- Add runtime a tag check for (strict) downward conversion by using
6570 -- the membership test, generating:
6572 -- [constraint_error when Operand not in Target_Type'Class]
6574 -- or in the access type case
6576 -- [constraint_error
6577 -- when Operand /= null
6578 -- and then Operand.all not in
6579 -- Designated_Type (Target_Type)'Class]
6581 if (Is_Access_Type
(Target_Type
)
6582 and then Is_Tagged_Type
(Designated_Type
(Target_Type
)))
6583 or else Is_Tagged_Type
(Target_Type
)
6585 -- Do not do any expansion in the access type case if the
6586 -- parent is a renaming, since this is an error situation
6587 -- which will be caught by Sem_Ch8, and the expansion can
6588 -- intefere with this error check.
6590 if Is_Access_Type
(Target_Type
)
6591 and then Is_Renamed_Object
(N
)
6596 -- Oherwise, proceed with processing tagged conversion
6599 Actual_Operand_Type
: Entity_Id
;
6600 Actual_Target_Type
: Entity_Id
;
6605 if Is_Access_Type
(Target_Type
) then
6606 Actual_Operand_Type
:= Designated_Type
(Operand_Type
);
6607 Actual_Target_Type
:= Designated_Type
(Target_Type
);
6610 Actual_Operand_Type
:= Operand_Type
;
6611 Actual_Target_Type
:= Target_Type
;
6614 if Is_Class_Wide_Type
(Actual_Operand_Type
)
6615 and then Root_Type
(Actual_Operand_Type
) /= Actual_Target_Type
6616 and then Is_Ancestor
6617 (Root_Type
(Actual_Operand_Type
),
6619 and then not Tag_Checks_Suppressed
(Actual_Target_Type
)
6621 -- The conversion is valid for any descendant of the
6624 Actual_Target_Type
:= Class_Wide_Type
(Actual_Target_Type
);
6626 if Is_Access_Type
(Target_Type
) then
6631 Left_Opnd
=> Duplicate_Subexpr_No_Checks
(Operand
),
6632 Right_Opnd
=> Make_Null
(Loc
)),
6637 Make_Explicit_Dereference
(Loc
,
6639 Duplicate_Subexpr_No_Checks
(Operand
)),
6641 New_Reference_To
(Actual_Target_Type
, Loc
)));
6646 Left_Opnd
=> Duplicate_Subexpr_No_Checks
(Operand
),
6648 New_Reference_To
(Actual_Target_Type
, Loc
));
6652 Make_Raise_Constraint_Error
(Loc
,
6654 Reason
=> CE_Tag_Check_Failed
));
6660 Make_Unchecked_Type_Conversion
(Loc
,
6661 Subtype_Mark
=> New_Occurrence_Of
(Target_Type
, Loc
),
6662 Expression
=> Relocate_Node
(Expression
(N
)));
6664 Analyze_And_Resolve
(N
, Target_Type
);
6669 -- Case of other access type conversions
6671 elsif Is_Access_Type
(Target_Type
) then
6672 Apply_Constraint_Check
(Operand
, Target_Type
);
6674 -- Case of conversions from a fixed-point type
6676 -- These conversions require special expansion and processing, found
6677 -- in the Exp_Fixd package. We ignore cases where Conversion_OK is
6678 -- set, since from a semantic point of view, these are simple integer
6679 -- conversions, which do not need further processing.
6681 elsif Is_Fixed_Point_Type
(Operand_Type
)
6682 and then not Conversion_OK
(N
)
6684 -- We should never see universal fixed at this case, since the
6685 -- expansion of the constituent divide or multiply should have
6686 -- eliminated the explicit mention of universal fixed.
6688 pragma Assert
(Operand_Type
/= Universal_Fixed
);
6690 -- Check for special case of the conversion to universal real
6691 -- that occurs as a result of the use of a round attribute.
6692 -- In this case, the real type for the conversion is taken
6693 -- from the target type of the Round attribute and the
6694 -- result must be marked as rounded.
6696 if Target_Type
= Universal_Real
6697 and then Nkind
(Parent
(N
)) = N_Attribute_Reference
6698 and then Attribute_Name
(Parent
(N
)) = Name_Round
6700 Set_Rounded_Result
(N
);
6701 Set_Etype
(N
, Etype
(Parent
(N
)));
6704 -- Otherwise do correct fixed-conversion, but skip these if the
6705 -- Conversion_OK flag is set, because from a semantic point of
6706 -- view these are simple integer conversions needing no further
6707 -- processing (the backend will simply treat them as integers)
6709 if not Conversion_OK
(N
) then
6710 if Is_Fixed_Point_Type
(Etype
(N
)) then
6711 Expand_Convert_Fixed_To_Fixed
(N
);
6714 elsif Is_Integer_Type
(Etype
(N
)) then
6715 Expand_Convert_Fixed_To_Integer
(N
);
6718 pragma Assert
(Is_Floating_Point_Type
(Etype
(N
)));
6719 Expand_Convert_Fixed_To_Float
(N
);
6724 -- Case of conversions to a fixed-point type
6726 -- These conversions require special expansion and processing, found
6727 -- in the Exp_Fixd package. Again, ignore cases where Conversion_OK
6728 -- is set, since from a semantic point of view, these are simple
6729 -- integer conversions, which do not need further processing.
6731 elsif Is_Fixed_Point_Type
(Target_Type
)
6732 and then not Conversion_OK
(N
)
6734 if Is_Integer_Type
(Operand_Type
) then
6735 Expand_Convert_Integer_To_Fixed
(N
);
6738 pragma Assert
(Is_Floating_Point_Type
(Operand_Type
));
6739 Expand_Convert_Float_To_Fixed
(N
);
6743 -- Case of float-to-integer conversions
6745 -- We also handle float-to-fixed conversions with Conversion_OK set
6746 -- since semantically the fixed-point target is treated as though it
6747 -- were an integer in such cases.
6749 elsif Is_Floating_Point_Type
(Operand_Type
)
6751 (Is_Integer_Type
(Target_Type
)
6753 (Is_Fixed_Point_Type
(Target_Type
) and then Conversion_OK
(N
)))
6755 -- Special processing required if the conversion is the expression
6756 -- of a Truncation attribute reference. In this case we replace:
6758 -- ityp (ftyp'Truncation (x))
6764 -- with the Float_Truncate flag set. This is clearly more efficient
6766 if Nkind
(Operand
) = N_Attribute_Reference
6767 and then Attribute_Name
(Operand
) = Name_Truncation
6770 Relocate_Node
(First
(Expressions
(Operand
))));
6771 Set_Float_Truncate
(N
, True);
6774 -- One more check here, gcc is still not able to do conversions of
6775 -- this type with proper overflow checking, and so gigi is doing an
6776 -- approximation of what is required by doing floating-point compares
6777 -- with the end-point. But that can lose precision in some cases, and
6778 -- give a wrong result. Converting the operand to Long_Long_Float is
6779 -- helpful, but still does not catch all cases with 64-bit integers
6780 -- on targets with only 64-bit floats ???
6782 if Do_Range_Check
(Operand
) then
6784 Make_Type_Conversion
(Loc
,
6786 New_Occurrence_Of
(Standard_Long_Long_Float
, Loc
),
6788 Relocate_Node
(Operand
)));
6790 Set_Etype
(Operand
, Standard_Long_Long_Float
);
6791 Enable_Range_Check
(Operand
);
6792 Set_Do_Range_Check
(Expression
(Operand
), False);
6795 -- Case of array conversions
6797 -- Expansion of array conversions, add required length/range checks
6798 -- but only do this if there is no change of representation. For
6799 -- handling of this case, see Handle_Changed_Representation.
6801 elsif Is_Array_Type
(Target_Type
) then
6803 if Is_Constrained
(Target_Type
) then
6804 Apply_Length_Check
(Operand
, Target_Type
);
6806 Apply_Range_Check
(Operand
, Target_Type
);
6809 Handle_Changed_Representation
;
6811 -- Case of conversions of discriminated types
6813 -- Add required discriminant checks if target is constrained. Again
6814 -- this change is skipped if we have a change of representation.
6816 elsif Has_Discriminants
(Target_Type
)
6817 and then Is_Constrained
(Target_Type
)
6819 Apply_Discriminant_Check
(Operand
, Target_Type
);
6820 Handle_Changed_Representation
;
6822 -- Case of all other record conversions. The only processing required
6823 -- is to check for a change of representation requiring the special
6824 -- assignment processing.
6826 elsif Is_Record_Type
(Target_Type
) then
6828 -- Ada 2005 (AI-216): Program_Error is raised when converting from
6829 -- a derived Unchecked_Union type to an unconstrained non-Unchecked_
6830 -- Union type if the operand lacks inferable discriminants.
6832 if Is_Derived_Type
(Operand_Type
)
6833 and then Is_Unchecked_Union
(Base_Type
(Operand_Type
))
6834 and then not Is_Constrained
(Target_Type
)
6835 and then not Is_Unchecked_Union
(Base_Type
(Target_Type
))
6836 and then not Has_Inferable_Discriminants
(Operand
)
6838 -- To prevent Gigi from generating illegal code, we make a
6839 -- Program_Error node, but we give it the target type of the
6843 PE
: constant Node_Id
:= Make_Raise_Program_Error
(Loc
,
6844 Reason
=> PE_Unchecked_Union_Restriction
);
6847 Set_Etype
(PE
, Target_Type
);
6852 Handle_Changed_Representation
;
6855 -- Case of conversions of enumeration types
6857 elsif Is_Enumeration_Type
(Target_Type
) then
6859 -- Special processing is required if there is a change of
6860 -- representation (from enumeration representation clauses)
6862 if not Same_Representation
(Target_Type
, Operand_Type
) then
6864 -- Convert: x(y) to x'val (ytyp'val (y))
6867 Make_Attribute_Reference
(Loc
,
6868 Prefix
=> New_Occurrence_Of
(Target_Type
, Loc
),
6869 Attribute_Name
=> Name_Val
,
6870 Expressions
=> New_List
(
6871 Make_Attribute_Reference
(Loc
,
6872 Prefix
=> New_Occurrence_Of
(Operand_Type
, Loc
),
6873 Attribute_Name
=> Name_Pos
,
6874 Expressions
=> New_List
(Operand
)))));
6876 Analyze_And_Resolve
(N
, Target_Type
);
6879 -- Case of conversions to floating-point
6881 elsif Is_Floating_Point_Type
(Target_Type
) then
6884 -- The remaining cases require no front end processing
6890 -- At this stage, either the conversion node has been transformed
6891 -- into some other equivalent expression, or left as a conversion
6892 -- that can be handled by Gigi. The conversions that Gigi can handle
6893 -- are the following:
6895 -- Conversions with no change of representation or type
6897 -- Numeric conversions involving integer values, floating-point
6898 -- values, and fixed-point values. Fixed-point values are allowed
6899 -- only if Conversion_OK is set, i.e. if the fixed-point values
6900 -- are to be treated as integers.
6902 -- No other conversions should be passed to Gigi
6904 -- Check: are these rules stated in sinfo??? if so, why restate here???
6906 -- The only remaining step is to generate a range check if we still
6907 -- have a type conversion at this stage and Do_Range_Check is set.
6908 -- For now we do this only for conversions of discrete types.
6910 if Nkind
(N
) = N_Type_Conversion
6911 and then Is_Discrete_Type
(Etype
(N
))
6914 Expr
: constant Node_Id
:= Expression
(N
);
6919 if Do_Range_Check
(Expr
)
6920 and then Is_Discrete_Type
(Etype
(Expr
))
6922 Set_Do_Range_Check
(Expr
, False);
6924 -- Before we do a range check, we have to deal with treating
6925 -- a fixed-point operand as an integer. The way we do this
6926 -- is simply to do an unchecked conversion to an appropriate
6927 -- integer type large enough to hold the result.
6929 -- This code is not active yet, because we are only dealing
6930 -- with discrete types so far ???
6932 if Nkind
(Expr
) in N_Has_Treat_Fixed_As_Integer
6933 and then Treat_Fixed_As_Integer
(Expr
)
6935 Ftyp
:= Base_Type
(Etype
(Expr
));
6937 if Esize
(Ftyp
) >= Esize
(Standard_Integer
) then
6938 Ityp
:= Standard_Long_Long_Integer
;
6940 Ityp
:= Standard_Integer
;
6943 Rewrite
(Expr
, Unchecked_Convert_To
(Ityp
, Expr
));
6946 -- Reset overflow flag, since the range check will include
6947 -- dealing with possible overflow, and generate the check
6948 -- If Address is either source or target type, suppress
6949 -- range check to avoid typing anomalies when it is a visible
6952 Set_Do_Overflow_Check
(N
, False);
6953 if not Is_Descendent_Of_Address
(Etype
(Expr
))
6954 and then not Is_Descendent_Of_Address
(Target_Type
)
6956 Generate_Range_Check
6957 (Expr
, Target_Type
, CE_Range_Check_Failed
);
6962 end Expand_N_Type_Conversion
;
6964 -----------------------------------
6965 -- Expand_N_Unchecked_Expression --
6966 -----------------------------------
6968 -- Remove the unchecked expression node from the tree. It's job was simply
6969 -- to make sure that its constituent expression was handled with checks
6970 -- off, and now that that is done, we can remove it from the tree, and
6971 -- indeed must, since gigi does not expect to see these nodes.
6973 procedure Expand_N_Unchecked_Expression
(N
: Node_Id
) is
6974 Exp
: constant Node_Id
:= Expression
(N
);
6977 Set_Assignment_OK
(Exp
, Assignment_OK
(N
) or Assignment_OK
(Exp
));
6979 end Expand_N_Unchecked_Expression
;
6981 ----------------------------------------
6982 -- Expand_N_Unchecked_Type_Conversion --
6983 ----------------------------------------
6985 -- If this cannot be handled by Gigi and we haven't already made
6986 -- a temporary for it, do it now.
6988 procedure Expand_N_Unchecked_Type_Conversion
(N
: Node_Id
) is
6989 Target_Type
: constant Entity_Id
:= Etype
(N
);
6990 Operand
: constant Node_Id
:= Expression
(N
);
6991 Operand_Type
: constant Entity_Id
:= Etype
(Operand
);
6994 -- If we have a conversion of a compile time known value to a target
6995 -- type and the value is in range of the target type, then we can simply
6996 -- replace the construct by an integer literal of the correct type. We
6997 -- only apply this to integer types being converted. Possibly it may
6998 -- apply in other cases, but it is too much trouble to worry about.
7000 -- Note that we do not do this transformation if the Kill_Range_Check
7001 -- flag is set, since then the value may be outside the expected range.
7002 -- This happens in the Normalize_Scalars case.
7004 if Is_Integer_Type
(Target_Type
)
7005 and then Is_Integer_Type
(Operand_Type
)
7006 and then Compile_Time_Known_Value
(Operand
)
7007 and then not Kill_Range_Check
(N
)
7010 Val
: constant Uint
:= Expr_Value
(Operand
);
7013 if Compile_Time_Known_Value
(Type_Low_Bound
(Target_Type
))
7015 Compile_Time_Known_Value
(Type_High_Bound
(Target_Type
))
7017 Val
>= Expr_Value
(Type_Low_Bound
(Target_Type
))
7019 Val
<= Expr_Value
(Type_High_Bound
(Target_Type
))
7021 Rewrite
(N
, Make_Integer_Literal
(Sloc
(N
), Val
));
7023 -- If Address is the target type, just set the type
7024 -- to avoid a spurious type error on the literal when
7025 -- Address is a visible integer type.
7027 if Is_Descendent_Of_Address
(Target_Type
) then
7028 Set_Etype
(N
, Target_Type
);
7030 Analyze_And_Resolve
(N
, Target_Type
);
7038 -- Nothing to do if conversion is safe
7040 if Safe_Unchecked_Type_Conversion
(N
) then
7044 -- Otherwise force evaluation unless Assignment_OK flag is set (this
7045 -- flag indicates ??? -- more comments needed here)
7047 if Assignment_OK
(N
) then
7050 Force_Evaluation
(N
);
7052 end Expand_N_Unchecked_Type_Conversion
;
7054 ----------------------------
7055 -- Expand_Record_Equality --
7056 ----------------------------
7058 -- For non-variant records, Equality is expanded when needed into:
7060 -- and then Lhs.Discr1 = Rhs.Discr1
7062 -- and then Lhs.Discrn = Rhs.Discrn
7063 -- and then Lhs.Cmp1 = Rhs.Cmp1
7065 -- and then Lhs.Cmpn = Rhs.Cmpn
7067 -- The expression is folded by the back-end for adjacent fields. This
7068 -- function is called for tagged record in only one occasion: for imple-
7069 -- menting predefined primitive equality (see Predefined_Primitives_Bodies)
7070 -- otherwise the primitive "=" is used directly.
7072 function Expand_Record_Equality
7077 Bodies
: List_Id
) return Node_Id
7079 Loc
: constant Source_Ptr
:= Sloc
(Nod
);
7084 First_Time
: Boolean := True;
7086 function Suitable_Element
(C
: Entity_Id
) return Entity_Id
;
7087 -- Return the first field to compare beginning with C, skipping the
7088 -- inherited components.
7090 ----------------------
7091 -- Suitable_Element --
7092 ----------------------
7094 function Suitable_Element
(C
: Entity_Id
) return Entity_Id
is
7099 elsif Ekind
(C
) /= E_Discriminant
7100 and then Ekind
(C
) /= E_Component
7102 return Suitable_Element
(Next_Entity
(C
));
7104 elsif Is_Tagged_Type
(Typ
)
7105 and then C
/= Original_Record_Component
(C
)
7107 return Suitable_Element
(Next_Entity
(C
));
7109 elsif Chars
(C
) = Name_uController
7110 or else Chars
(C
) = Name_uTag
7112 return Suitable_Element
(Next_Entity
(C
));
7117 end Suitable_Element
;
7119 -- Start of processing for Expand_Record_Equality
7122 -- Generates the following code: (assuming that Typ has one Discr and
7123 -- component C2 is also a record)
7126 -- and then Lhs.Discr1 = Rhs.Discr1
7127 -- and then Lhs.C1 = Rhs.C1
7128 -- and then Lhs.C2.C1=Rhs.C2.C1 and then ... Lhs.C2.Cn=Rhs.C2.Cn
7130 -- and then Lhs.Cmpn = Rhs.Cmpn
7132 Result
:= New_Reference_To
(Standard_True
, Loc
);
7133 C
:= Suitable_Element
(First_Entity
(Typ
));
7135 while Present
(C
) loop
7143 First_Time
:= False;
7147 New_Lhs
:= New_Copy_Tree
(Lhs
);
7148 New_Rhs
:= New_Copy_Tree
(Rhs
);
7152 Expand_Composite_Equality
(Nod
, Etype
(C
),
7154 Make_Selected_Component
(Loc
,
7156 Selector_Name
=> New_Reference_To
(C
, Loc
)),
7158 Make_Selected_Component
(Loc
,
7160 Selector_Name
=> New_Reference_To
(C
, Loc
)),
7163 -- If some (sub)component is an unchecked_union, the whole
7164 -- operation will raise program error.
7166 if Nkind
(Check
) = N_Raise_Program_Error
then
7168 Set_Etype
(Result
, Standard_Boolean
);
7173 Left_Opnd
=> Result
,
7174 Right_Opnd
=> Check
);
7178 C
:= Suitable_Element
(Next_Entity
(C
));
7182 end Expand_Record_Equality
;
7184 -------------------------------------
7185 -- Fixup_Universal_Fixed_Operation --
7186 -------------------------------------
7188 procedure Fixup_Universal_Fixed_Operation
(N
: Node_Id
) is
7189 Conv
: constant Node_Id
:= Parent
(N
);
7192 -- We must have a type conversion immediately above us
7194 pragma Assert
(Nkind
(Conv
) = N_Type_Conversion
);
7196 -- Normally the type conversion gives our target type. The exception
7197 -- occurs in the case of the Round attribute, where the conversion
7198 -- will be to universal real, and our real type comes from the Round
7199 -- attribute (as well as an indication that we must round the result)
7201 if Nkind
(Parent
(Conv
)) = N_Attribute_Reference
7202 and then Attribute_Name
(Parent
(Conv
)) = Name_Round
7204 Set_Etype
(N
, Etype
(Parent
(Conv
)));
7205 Set_Rounded_Result
(N
);
7207 -- Normal case where type comes from conversion above us
7210 Set_Etype
(N
, Etype
(Conv
));
7212 end Fixup_Universal_Fixed_Operation
;
7214 ------------------------------
7215 -- Get_Allocator_Final_List --
7216 ------------------------------
7218 function Get_Allocator_Final_List
7221 PtrT
: Entity_Id
) return Entity_Id
7223 Loc
: constant Source_Ptr
:= Sloc
(N
);
7225 Owner
: Entity_Id
:= PtrT
;
7226 -- The entity whose finalisation list must be used to attach the
7227 -- allocated object.
7230 if Ekind
(PtrT
) = E_Anonymous_Access_Type
then
7231 if Nkind
(Associated_Node_For_Itype
(PtrT
))
7232 in N_Subprogram_Specification
7234 -- If the context is an access parameter, we need to create
7235 -- a non-anonymous access type in order to have a usable
7236 -- final list, because there is otherwise no pool to which
7237 -- the allocated object can belong. We create both the type
7238 -- and the finalization chain here, because freezing an
7239 -- internal type does not create such a chain. The Final_Chain
7240 -- that is thus created is shared by the access parameter.
7242 Owner
:= Make_Defining_Identifier
(Loc
, New_Internal_Name
('J'));
7244 Make_Full_Type_Declaration
(Loc
,
7245 Defining_Identifier
=> Owner
,
7247 Make_Access_To_Object_Definition
(Loc
,
7248 Subtype_Indication
=>
7249 New_Occurrence_Of
(T
, Loc
))));
7251 Build_Final_List
(N
, Owner
);
7252 Set_Associated_Final_Chain
(PtrT
, Associated_Final_Chain
(Owner
));
7255 -- Case of an access discriminant, or (Ada 2005) of
7256 -- an anonymous access component: find the final list
7257 -- associated with the scope of the type.
7259 Owner
:= Scope
(PtrT
);
7263 return Find_Final_List
(Owner
);
7264 end Get_Allocator_Final_List
;
7266 ---------------------------------
7267 -- Has_Inferable_Discriminants --
7268 ---------------------------------
7270 function Has_Inferable_Discriminants
(N
: Node_Id
) return Boolean is
7272 function Prefix_Is_Formal_Parameter
(N
: Node_Id
) return Boolean;
7273 -- Determines whether the left-most prefix of a selected component is a
7274 -- formal parameter in a subprogram. Assumes N is a selected component.
7276 --------------------------------
7277 -- Prefix_Is_Formal_Parameter --
7278 --------------------------------
7280 function Prefix_Is_Formal_Parameter
(N
: Node_Id
) return Boolean is
7281 Sel_Comp
: Node_Id
:= N
;
7284 -- Move to the left-most prefix by climbing up the tree
7286 while Present
(Parent
(Sel_Comp
))
7287 and then Nkind
(Parent
(Sel_Comp
)) = N_Selected_Component
7289 Sel_Comp
:= Parent
(Sel_Comp
);
7292 return Ekind
(Entity
(Prefix
(Sel_Comp
))) in Formal_Kind
;
7293 end Prefix_Is_Formal_Parameter
;
7295 -- Start of processing for Has_Inferable_Discriminants
7298 -- For identifiers and indexed components, it is sufficent to have a
7299 -- constrained Unchecked_Union nominal subtype.
7301 if Nkind
(N
) = N_Identifier
7303 Nkind
(N
) = N_Indexed_Component
7305 return Is_Unchecked_Union
(Base_Type
(Etype
(N
)))
7307 Is_Constrained
(Etype
(N
));
7309 -- For selected components, the subtype of the selector must be a
7310 -- constrained Unchecked_Union. If the component is subject to a
7311 -- per-object constraint, then the enclosing object must have inferable
7314 elsif Nkind
(N
) = N_Selected_Component
then
7315 if Has_Per_Object_Constraint
(Entity
(Selector_Name
(N
))) then
7317 -- A small hack. If we have a per-object constrained selected
7318 -- component of a formal parameter, return True since we do not
7319 -- know the actual parameter association yet.
7321 if Prefix_Is_Formal_Parameter
(N
) then
7325 -- Otherwise, check the enclosing object and the selector
7327 return Has_Inferable_Discriminants
(Prefix
(N
))
7329 Has_Inferable_Discriminants
(Selector_Name
(N
));
7332 -- The call to Has_Inferable_Discriminants will determine whether
7333 -- the selector has a constrained Unchecked_Union nominal type.
7335 return Has_Inferable_Discriminants
(Selector_Name
(N
));
7337 -- A qualified expression has inferable discriminants if its subtype
7338 -- mark is a constrained Unchecked_Union subtype.
7340 elsif Nkind
(N
) = N_Qualified_Expression
then
7341 return Is_Unchecked_Union
(Subtype_Mark
(N
))
7343 Is_Constrained
(Subtype_Mark
(N
));
7348 end Has_Inferable_Discriminants
;
7350 -------------------------------
7351 -- Insert_Dereference_Action --
7352 -------------------------------
7354 procedure Insert_Dereference_Action
(N
: Node_Id
) is
7355 Loc
: constant Source_Ptr
:= Sloc
(N
);
7356 Typ
: constant Entity_Id
:= Etype
(N
);
7357 Pool
: constant Entity_Id
:= Associated_Storage_Pool
(Typ
);
7358 Pnod
: constant Node_Id
:= Parent
(N
);
7360 function Is_Checked_Storage_Pool
(P
: Entity_Id
) return Boolean;
7361 -- Return true if type of P is derived from Checked_Pool;
7363 -----------------------------
7364 -- Is_Checked_Storage_Pool --
7365 -----------------------------
7367 function Is_Checked_Storage_Pool
(P
: Entity_Id
) return Boolean is
7376 while T
/= Etype
(T
) loop
7377 if Is_RTE
(T
, RE_Checked_Pool
) then
7385 end Is_Checked_Storage_Pool
;
7387 -- Start of processing for Insert_Dereference_Action
7390 pragma Assert
(Nkind
(Pnod
) = N_Explicit_Dereference
);
7392 if not (Is_Checked_Storage_Pool
(Pool
)
7393 and then Comes_From_Source
(Original_Node
(Pnod
)))
7399 Make_Procedure_Call_Statement
(Loc
,
7400 Name
=> New_Reference_To
(
7401 Find_Prim_Op
(Etype
(Pool
), Name_Dereference
), Loc
),
7403 Parameter_Associations
=> New_List
(
7407 New_Reference_To
(Pool
, Loc
),
7409 -- Storage_Address. We use the attribute Pool_Address,
7410 -- which uses the pointer itself to find the address of
7411 -- the object, and which handles unconstrained arrays
7412 -- properly by computing the address of the template.
7413 -- i.e. the correct address of the corresponding allocation.
7415 Make_Attribute_Reference
(Loc
,
7416 Prefix
=> Duplicate_Subexpr_Move_Checks
(N
),
7417 Attribute_Name
=> Name_Pool_Address
),
7419 -- Size_In_Storage_Elements
7421 Make_Op_Divide
(Loc
,
7423 Make_Attribute_Reference
(Loc
,
7425 Make_Explicit_Dereference
(Loc
,
7426 Duplicate_Subexpr_Move_Checks
(N
)),
7427 Attribute_Name
=> Name_Size
),
7429 Make_Integer_Literal
(Loc
, System_Storage_Unit
)),
7433 Make_Attribute_Reference
(Loc
,
7435 Make_Explicit_Dereference
(Loc
,
7436 Duplicate_Subexpr_Move_Checks
(N
)),
7437 Attribute_Name
=> Name_Alignment
))));
7440 when RE_Not_Available
=>
7442 end Insert_Dereference_Action
;
7444 ------------------------------
7445 -- Make_Array_Comparison_Op --
7446 ------------------------------
7448 -- This is a hand-coded expansion of the following generic function:
7451 -- type elem is (<>);
7452 -- type index is (<>);
7453 -- type a is array (index range <>) of elem;
7455 -- function Gnnn (X : a; Y: a) return boolean is
7456 -- J : index := Y'first;
7459 -- if X'length = 0 then
7462 -- elsif Y'length = 0 then
7466 -- for I in X'range loop
7467 -- if X (I) = Y (J) then
7468 -- if J = Y'last then
7471 -- J := index'succ (J);
7475 -- return X (I) > Y (J);
7479 -- return X'length > Y'length;
7483 -- Note that since we are essentially doing this expansion by hand, we
7484 -- do not need to generate an actual or formal generic part, just the
7485 -- instantiated function itself.
7487 function Make_Array_Comparison_Op
7489 Nod
: Node_Id
) return Node_Id
7491 Loc
: constant Source_Ptr
:= Sloc
(Nod
);
7493 X
: constant Entity_Id
:= Make_Defining_Identifier
(Loc
, Name_uX
);
7494 Y
: constant Entity_Id
:= Make_Defining_Identifier
(Loc
, Name_uY
);
7495 I
: constant Entity_Id
:= Make_Defining_Identifier
(Loc
, Name_uI
);
7496 J
: constant Entity_Id
:= Make_Defining_Identifier
(Loc
, Name_uJ
);
7498 Index
: constant Entity_Id
:= Base_Type
(Etype
(First_Index
(Typ
)));
7500 Loop_Statement
: Node_Id
;
7501 Loop_Body
: Node_Id
;
7504 Final_Expr
: Node_Id
;
7505 Func_Body
: Node_Id
;
7506 Func_Name
: Entity_Id
;
7512 -- if J = Y'last then
7515 -- J := index'succ (J);
7519 Make_Implicit_If_Statement
(Nod
,
7522 Left_Opnd
=> New_Reference_To
(J
, Loc
),
7524 Make_Attribute_Reference
(Loc
,
7525 Prefix
=> New_Reference_To
(Y
, Loc
),
7526 Attribute_Name
=> Name_Last
)),
7528 Then_Statements
=> New_List
(
7529 Make_Exit_Statement
(Loc
)),
7533 Make_Assignment_Statement
(Loc
,
7534 Name
=> New_Reference_To
(J
, Loc
),
7536 Make_Attribute_Reference
(Loc
,
7537 Prefix
=> New_Reference_To
(Index
, Loc
),
7538 Attribute_Name
=> Name_Succ
,
7539 Expressions
=> New_List
(New_Reference_To
(J
, Loc
))))));
7541 -- if X (I) = Y (J) then
7544 -- return X (I) > Y (J);
7548 Make_Implicit_If_Statement
(Nod
,
7552 Make_Indexed_Component
(Loc
,
7553 Prefix
=> New_Reference_To
(X
, Loc
),
7554 Expressions
=> New_List
(New_Reference_To
(I
, Loc
))),
7557 Make_Indexed_Component
(Loc
,
7558 Prefix
=> New_Reference_To
(Y
, Loc
),
7559 Expressions
=> New_List
(New_Reference_To
(J
, Loc
)))),
7561 Then_Statements
=> New_List
(Inner_If
),
7563 Else_Statements
=> New_List
(
7564 Make_Return_Statement
(Loc
,
7568 Make_Indexed_Component
(Loc
,
7569 Prefix
=> New_Reference_To
(X
, Loc
),
7570 Expressions
=> New_List
(New_Reference_To
(I
, Loc
))),
7573 Make_Indexed_Component
(Loc
,
7574 Prefix
=> New_Reference_To
(Y
, Loc
),
7575 Expressions
=> New_List
(
7576 New_Reference_To
(J
, Loc
)))))));
7578 -- for I in X'range loop
7583 Make_Implicit_Loop_Statement
(Nod
,
7584 Identifier
=> Empty
,
7587 Make_Iteration_Scheme
(Loc
,
7588 Loop_Parameter_Specification
=>
7589 Make_Loop_Parameter_Specification
(Loc
,
7590 Defining_Identifier
=> I
,
7591 Discrete_Subtype_Definition
=>
7592 Make_Attribute_Reference
(Loc
,
7593 Prefix
=> New_Reference_To
(X
, Loc
),
7594 Attribute_Name
=> Name_Range
))),
7596 Statements
=> New_List
(Loop_Body
));
7598 -- if X'length = 0 then
7600 -- elsif Y'length = 0 then
7603 -- for ... loop ... end loop;
7604 -- return X'length > Y'length;
7608 Make_Attribute_Reference
(Loc
,
7609 Prefix
=> New_Reference_To
(X
, Loc
),
7610 Attribute_Name
=> Name_Length
);
7613 Make_Attribute_Reference
(Loc
,
7614 Prefix
=> New_Reference_To
(Y
, Loc
),
7615 Attribute_Name
=> Name_Length
);
7619 Left_Opnd
=> Length1
,
7620 Right_Opnd
=> Length2
);
7623 Make_Implicit_If_Statement
(Nod
,
7627 Make_Attribute_Reference
(Loc
,
7628 Prefix
=> New_Reference_To
(X
, Loc
),
7629 Attribute_Name
=> Name_Length
),
7631 Make_Integer_Literal
(Loc
, 0)),
7635 Make_Return_Statement
(Loc
,
7636 Expression
=> New_Reference_To
(Standard_False
, Loc
))),
7638 Elsif_Parts
=> New_List
(
7639 Make_Elsif_Part
(Loc
,
7643 Make_Attribute_Reference
(Loc
,
7644 Prefix
=> New_Reference_To
(Y
, Loc
),
7645 Attribute_Name
=> Name_Length
),
7647 Make_Integer_Literal
(Loc
, 0)),
7651 Make_Return_Statement
(Loc
,
7652 Expression
=> New_Reference_To
(Standard_True
, Loc
))))),
7654 Else_Statements
=> New_List
(
7656 Make_Return_Statement
(Loc
,
7657 Expression
=> Final_Expr
)));
7661 Formals
:= New_List
(
7662 Make_Parameter_Specification
(Loc
,
7663 Defining_Identifier
=> X
,
7664 Parameter_Type
=> New_Reference_To
(Typ
, Loc
)),
7666 Make_Parameter_Specification
(Loc
,
7667 Defining_Identifier
=> Y
,
7668 Parameter_Type
=> New_Reference_To
(Typ
, Loc
)));
7670 -- function Gnnn (...) return boolean is
7671 -- J : index := Y'first;
7676 Func_Name
:= Make_Defining_Identifier
(Loc
, New_Internal_Name
('G'));
7679 Make_Subprogram_Body
(Loc
,
7681 Make_Function_Specification
(Loc
,
7682 Defining_Unit_Name
=> Func_Name
,
7683 Parameter_Specifications
=> Formals
,
7684 Subtype_Mark
=> New_Reference_To
(Standard_Boolean
, Loc
)),
7686 Declarations
=> New_List
(
7687 Make_Object_Declaration
(Loc
,
7688 Defining_Identifier
=> J
,
7689 Object_Definition
=> New_Reference_To
(Index
, Loc
),
7691 Make_Attribute_Reference
(Loc
,
7692 Prefix
=> New_Reference_To
(Y
, Loc
),
7693 Attribute_Name
=> Name_First
))),
7695 Handled_Statement_Sequence
=>
7696 Make_Handled_Sequence_Of_Statements
(Loc
,
7697 Statements
=> New_List
(If_Stat
)));
7701 end Make_Array_Comparison_Op
;
7703 ---------------------------
7704 -- Make_Boolean_Array_Op --
7705 ---------------------------
7707 -- For logical operations on boolean arrays, expand in line the
7708 -- following, replacing 'and' with 'or' or 'xor' where needed:
7710 -- function Annn (A : typ; B: typ) return typ is
7713 -- for J in A'range loop
7714 -- C (J) := A (J) op B (J);
7719 -- Here typ is the boolean array type
7721 function Make_Boolean_Array_Op
7723 N
: Node_Id
) return Node_Id
7725 Loc
: constant Source_Ptr
:= Sloc
(N
);
7727 A
: constant Entity_Id
:= Make_Defining_Identifier
(Loc
, Name_uA
);
7728 B
: constant Entity_Id
:= Make_Defining_Identifier
(Loc
, Name_uB
);
7729 C
: constant Entity_Id
:= Make_Defining_Identifier
(Loc
, Name_uC
);
7730 J
: constant Entity_Id
:= Make_Defining_Identifier
(Loc
, Name_uJ
);
7738 Func_Name
: Entity_Id
;
7739 Func_Body
: Node_Id
;
7740 Loop_Statement
: Node_Id
;
7744 Make_Indexed_Component
(Loc
,
7745 Prefix
=> New_Reference_To
(A
, Loc
),
7746 Expressions
=> New_List
(New_Reference_To
(J
, Loc
)));
7749 Make_Indexed_Component
(Loc
,
7750 Prefix
=> New_Reference_To
(B
, Loc
),
7751 Expressions
=> New_List
(New_Reference_To
(J
, Loc
)));
7754 Make_Indexed_Component
(Loc
,
7755 Prefix
=> New_Reference_To
(C
, Loc
),
7756 Expressions
=> New_List
(New_Reference_To
(J
, Loc
)));
7758 if Nkind
(N
) = N_Op_And
then
7764 elsif Nkind
(N
) = N_Op_Or
then
7778 Make_Implicit_Loop_Statement
(N
,
7779 Identifier
=> Empty
,
7782 Make_Iteration_Scheme
(Loc
,
7783 Loop_Parameter_Specification
=>
7784 Make_Loop_Parameter_Specification
(Loc
,
7785 Defining_Identifier
=> J
,
7786 Discrete_Subtype_Definition
=>
7787 Make_Attribute_Reference
(Loc
,
7788 Prefix
=> New_Reference_To
(A
, Loc
),
7789 Attribute_Name
=> Name_Range
))),
7791 Statements
=> New_List
(
7792 Make_Assignment_Statement
(Loc
,
7794 Expression
=> Op
)));
7796 Formals
:= New_List
(
7797 Make_Parameter_Specification
(Loc
,
7798 Defining_Identifier
=> A
,
7799 Parameter_Type
=> New_Reference_To
(Typ
, Loc
)),
7801 Make_Parameter_Specification
(Loc
,
7802 Defining_Identifier
=> B
,
7803 Parameter_Type
=> New_Reference_To
(Typ
, Loc
)));
7806 Make_Defining_Identifier
(Loc
, New_Internal_Name
('A'));
7807 Set_Is_Inlined
(Func_Name
);
7810 Make_Subprogram_Body
(Loc
,
7812 Make_Function_Specification
(Loc
,
7813 Defining_Unit_Name
=> Func_Name
,
7814 Parameter_Specifications
=> Formals
,
7815 Subtype_Mark
=> New_Reference_To
(Typ
, Loc
)),
7817 Declarations
=> New_List
(
7818 Make_Object_Declaration
(Loc
,
7819 Defining_Identifier
=> C
,
7820 Object_Definition
=> New_Reference_To
(Typ
, Loc
))),
7822 Handled_Statement_Sequence
=>
7823 Make_Handled_Sequence_Of_Statements
(Loc
,
7824 Statements
=> New_List
(
7826 Make_Return_Statement
(Loc
,
7827 Expression
=> New_Reference_To
(C
, Loc
)))));
7830 end Make_Boolean_Array_Op
;
7832 ------------------------
7833 -- Rewrite_Comparison --
7834 ------------------------
7836 procedure Rewrite_Comparison
(N
: Node_Id
) is
7837 Typ
: constant Entity_Id
:= Etype
(N
);
7838 Op1
: constant Node_Id
:= Left_Opnd
(N
);
7839 Op2
: constant Node_Id
:= Right_Opnd
(N
);
7841 Res
: constant Compare_Result
:= Compile_Time_Compare
(Op1
, Op2
);
7842 -- Res indicates if compare outcome can be determined at compile time
7844 True_Result
: Boolean;
7845 False_Result
: Boolean;
7848 case N_Op_Compare
(Nkind
(N
)) is
7850 True_Result
:= Res
= EQ
;
7851 False_Result
:= Res
= LT
or else Res
= GT
or else Res
= NE
;
7854 True_Result
:= Res
in Compare_GE
;
7855 False_Result
:= Res
= LT
;
7858 True_Result
:= Res
= GT
;
7859 False_Result
:= Res
in Compare_LE
;
7862 True_Result
:= Res
= LT
;
7863 False_Result
:= Res
in Compare_GE
;
7866 True_Result
:= Res
in Compare_LE
;
7867 False_Result
:= Res
= GT
;
7870 True_Result
:= Res
= NE
;
7871 False_Result
:= Res
= LT
or else Res
= GT
or else Res
= EQ
;
7876 Convert_To
(Typ
, New_Occurrence_Of
(Standard_True
, Sloc
(N
))));
7877 Analyze_And_Resolve
(N
, Typ
);
7878 Warn_On_Known_Condition
(N
);
7880 elsif False_Result
then
7882 Convert_To
(Typ
, New_Occurrence_Of
(Standard_False
, Sloc
(N
))));
7883 Analyze_And_Resolve
(N
, Typ
);
7884 Warn_On_Known_Condition
(N
);
7886 end Rewrite_Comparison
;
7888 ----------------------------
7889 -- Safe_In_Place_Array_Op --
7890 ----------------------------
7892 function Safe_In_Place_Array_Op
7895 Op2
: Node_Id
) return Boolean
7899 function Is_Safe_Operand
(Op
: Node_Id
) return Boolean;
7900 -- Operand is safe if it cannot overlap part of the target of the
7901 -- operation. If the operand and the target are identical, the operand
7902 -- is safe. The operand can be empty in the case of negation.
7904 function Is_Unaliased
(N
: Node_Id
) return Boolean;
7905 -- Check that N is a stand-alone entity
7911 function Is_Unaliased
(N
: Node_Id
) return Boolean is
7915 and then No
(Address_Clause
(Entity
(N
)))
7916 and then No
(Renamed_Object
(Entity
(N
)));
7919 ---------------------
7920 -- Is_Safe_Operand --
7921 ---------------------
7923 function Is_Safe_Operand
(Op
: Node_Id
) return Boolean is
7928 elsif Is_Entity_Name
(Op
) then
7929 return Is_Unaliased
(Op
);
7931 elsif Nkind
(Op
) = N_Indexed_Component
7932 or else Nkind
(Op
) = N_Selected_Component
7934 return Is_Unaliased
(Prefix
(Op
));
7936 elsif Nkind
(Op
) = N_Slice
then
7938 Is_Unaliased
(Prefix
(Op
))
7939 and then Entity
(Prefix
(Op
)) /= Target
;
7941 elsif Nkind
(Op
) = N_Op_Not
then
7942 return Is_Safe_Operand
(Right_Opnd
(Op
));
7947 end Is_Safe_Operand
;
7949 -- Start of processing for Is_Safe_In_Place_Array_Op
7952 -- We skip this processing if the component size is not the
7953 -- same as a system storage unit (since at least for NOT
7954 -- this would cause problems).
7956 if Component_Size
(Etype
(Lhs
)) /= System_Storage_Unit
then
7959 -- Cannot do in place stuff on Java_VM since cannot pass addresses
7964 -- Cannot do in place stuff if non-standard Boolean representation
7966 elsif Has_Non_Standard_Rep
(Component_Type
(Etype
(Lhs
))) then
7969 elsif not Is_Unaliased
(Lhs
) then
7972 Target
:= Entity
(Lhs
);
7975 Is_Safe_Operand
(Op1
)
7976 and then Is_Safe_Operand
(Op2
);
7978 end Safe_In_Place_Array_Op
;
7980 -----------------------
7981 -- Tagged_Membership --
7982 -----------------------
7984 -- There are two different cases to consider depending on whether
7985 -- the right operand is a class-wide type or not. If not we just
7986 -- compare the actual tag of the left expr to the target type tag:
7988 -- Left_Expr.Tag = Right_Type'Tag;
7990 -- If it is a class-wide type we use the RT function CW_Membership which
7991 -- is usually implemented by looking in the ancestor tables contained in
7992 -- the dispatch table pointed by Left_Expr.Tag for Typ'Tag
7994 function Tagged_Membership
(N
: Node_Id
) return Node_Id
is
7995 Left
: constant Node_Id
:= Left_Opnd
(N
);
7996 Right
: constant Node_Id
:= Right_Opnd
(N
);
7997 Loc
: constant Source_Ptr
:= Sloc
(N
);
7999 Left_Type
: Entity_Id
;
8000 Right_Type
: Entity_Id
;
8004 Left_Type
:= Etype
(Left
);
8005 Right_Type
:= Etype
(Right
);
8007 if Is_Class_Wide_Type
(Left_Type
) then
8008 Left_Type
:= Root_Type
(Left_Type
);
8012 Make_Selected_Component
(Loc
,
8013 Prefix
=> Relocate_Node
(Left
),
8015 New_Reference_To
(First_Tag_Component
(Left_Type
), Loc
));
8017 if Is_Class_Wide_Type
(Right_Type
) then
8019 Make_DT_Access_Action
(Left_Type
,
8020 Action
=> CW_Membership
,
8025 (Access_Disp_Table
(Root_Type
(Right_Type
)))),
8030 Left_Opnd
=> Obj_Tag
,
8033 (Node
(First_Elmt
(Access_Disp_Table
(Right_Type
))), Loc
));
8036 end Tagged_Membership
;
8038 ------------------------------
8039 -- Unary_Op_Validity_Checks --
8040 ------------------------------
8042 procedure Unary_Op_Validity_Checks
(N
: Node_Id
) is
8044 if Validity_Checks_On
and Validity_Check_Operands
then
8045 Ensure_Valid
(Right_Opnd
(N
));
8047 end Unary_Op_Validity_Checks
;