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70482933 RK |
1 | ------------------------------------------------------------------------------ |
2 | -- -- | |
3 | -- GNAT COMPILER COMPONENTS -- | |
4 | -- -- | |
5 | -- E X P _ C H 4 -- | |
59262ebb | 6 | -- -- |
70482933 RK |
7 | -- B o d y -- |
8 | -- -- | |
59ae6391 | 9 | -- Copyright (C) 1992-2008, Free Software Foundation, Inc. -- |
70482933 RK |
10 | -- -- |
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- -- | |
b5c84c3c | 13 | -- ware Foundation; either version 3, or (at your option) any later ver- -- |
70482933 RK |
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 -- | |
b5c84c3c RD |
18 | -- Public License distributed with GNAT; see file COPYING3. If not, go to -- |
19 | -- http://www.gnu.org/licenses for a complete copy of the license. -- | |
70482933 RK |
20 | -- -- |
21 | -- GNAT was originally developed by the GNAT team at New York University. -- | |
71ff80dc | 22 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
70482933 RK |
23 | -- -- |
24 | ------------------------------------------------------------------------------ | |
25 | ||
26 | with Atree; use Atree; | |
27 | with Checks; use Checks; | |
28 | with Einfo; use Einfo; | |
29 | with Elists; use Elists; | |
30 | with Errout; use Errout; | |
31 | with Exp_Aggr; use Exp_Aggr; | |
0669bebe | 32 | with Exp_Atag; use Exp_Atag; |
70482933 | 33 | with Exp_Ch3; use Exp_Ch3; |
20b5d666 | 34 | with Exp_Ch6; use Exp_Ch6; |
70482933 RK |
35 | with Exp_Ch7; use Exp_Ch7; |
36 | with Exp_Ch9; use Exp_Ch9; | |
20b5d666 | 37 | with Exp_Disp; use Exp_Disp; |
70482933 RK |
38 | with Exp_Fixd; use Exp_Fixd; |
39 | with Exp_Pakd; use Exp_Pakd; | |
40 | with Exp_Tss; use Exp_Tss; | |
41 | with Exp_Util; use Exp_Util; | |
42 | with Exp_VFpt; use Exp_VFpt; | |
f02b8bb8 | 43 | with Freeze; use Freeze; |
70482933 | 44 | with Inline; use Inline; |
26bff3d9 | 45 | with Namet; use Namet; |
70482933 RK |
46 | with Nlists; use Nlists; |
47 | with Nmake; use Nmake; | |
48 | with Opt; use Opt; | |
0669bebe GB |
49 | with Restrict; use Restrict; |
50 | with Rident; use Rident; | |
70482933 RK |
51 | with Rtsfind; use Rtsfind; |
52 | with Sem; use Sem; | |
a4100e55 | 53 | with Sem_Aux; use Sem_Aux; |
70482933 | 54 | with Sem_Cat; use Sem_Cat; |
5d09245e | 55 | with Sem_Ch3; use Sem_Ch3; |
26bff3d9 | 56 | with Sem_Ch8; use Sem_Ch8; |
70482933 RK |
57 | with Sem_Ch13; use Sem_Ch13; |
58 | with Sem_Eval; use Sem_Eval; | |
59 | with Sem_Res; use Sem_Res; | |
60 | with Sem_Type; use Sem_Type; | |
61 | with Sem_Util; use Sem_Util; | |
07fc65c4 | 62 | with Sem_Warn; use Sem_Warn; |
70482933 | 63 | with Sinfo; use Sinfo; |
70482933 RK |
64 | with Snames; use Snames; |
65 | with Stand; use Stand; | |
07fc65c4 | 66 | with Targparm; use Targparm; |
70482933 RK |
67 | with Tbuild; use Tbuild; |
68 | with Ttypes; use Ttypes; | |
69 | with Uintp; use Uintp; | |
70 | with Urealp; use Urealp; | |
71 | with Validsw; use Validsw; | |
72 | ||
73 | package body Exp_Ch4 is | |
74 | ||
15ce9ca2 AC |
75 | ----------------------- |
76 | -- Local Subprograms -- | |
77 | ----------------------- | |
70482933 RK |
78 | |
79 | procedure Binary_Op_Validity_Checks (N : Node_Id); | |
80 | pragma Inline (Binary_Op_Validity_Checks); | |
81 | -- Performs validity checks for a binary operator | |
82 | ||
fbf5a39b AC |
83 | procedure Build_Boolean_Array_Proc_Call |
84 | (N : Node_Id; | |
85 | Op1 : Node_Id; | |
86 | Op2 : Node_Id); | |
303b4d58 | 87 | -- If a boolean array assignment can be done in place, build call to |
fbf5a39b AC |
88 | -- corresponding library procedure. |
89 | ||
26bff3d9 JM |
90 | procedure Displace_Allocator_Pointer (N : Node_Id); |
91 | -- Ada 2005 (AI-251): Subsidiary procedure to Expand_N_Allocator and | |
92 | -- Expand_Allocator_Expression. Allocating class-wide interface objects | |
93 | -- this routine displaces the pointer to the allocated object to reference | |
94 | -- the component referencing the corresponding secondary dispatch table. | |
95 | ||
fbf5a39b AC |
96 | procedure Expand_Allocator_Expression (N : Node_Id); |
97 | -- Subsidiary to Expand_N_Allocator, for the case when the expression | |
98 | -- is a qualified expression or an aggregate. | |
99 | ||
70482933 RK |
100 | procedure Expand_Array_Comparison (N : Node_Id); |
101 | -- This routine handles expansion of the comparison operators (N_Op_Lt, | |
102 | -- N_Op_Le, N_Op_Gt, N_Op_Ge) when operating on an array type. The basic | |
103 | -- code for these operators is similar, differing only in the details of | |
fbf5a39b AC |
104 | -- the actual comparison call that is made. Special processing (call a |
105 | -- run-time routine) | |
70482933 RK |
106 | |
107 | function Expand_Array_Equality | |
108 | (Nod : Node_Id; | |
70482933 RK |
109 | Lhs : Node_Id; |
110 | Rhs : Node_Id; | |
0da2c8ac AC |
111 | Bodies : List_Id; |
112 | Typ : Entity_Id) return Node_Id; | |
70482933 | 113 | -- Expand an array equality into a call to a function implementing this |
685094bf RD |
114 | -- equality, and a call to it. Loc is the location for the generated nodes. |
115 | -- Lhs and Rhs are the array expressions to be compared. Bodies is a list | |
116 | -- on which to attach bodies of local functions that are created in the | |
117 | -- process. It is the responsibility of the caller to insert those bodies | |
118 | -- at the right place. Nod provides the Sloc value for the generated code. | |
119 | -- Normally the types used for the generated equality routine are taken | |
120 | -- from Lhs and Rhs. However, in some situations of generated code, the | |
121 | -- Etype fields of Lhs and Rhs are not set yet. In such cases, Typ supplies | |
122 | -- the type to be used for the formal parameters. | |
70482933 RK |
123 | |
124 | procedure Expand_Boolean_Operator (N : Node_Id); | |
685094bf RD |
125 | -- Common expansion processing for Boolean operators (And, Or, Xor) for the |
126 | -- case of array type arguments. | |
70482933 RK |
127 | |
128 | function Expand_Composite_Equality | |
129 | (Nod : Node_Id; | |
130 | Typ : Entity_Id; | |
131 | Lhs : Node_Id; | |
132 | Rhs : Node_Id; | |
2e071734 | 133 | Bodies : List_Id) return Node_Id; |
685094bf RD |
134 | -- Local recursive function used to expand equality for nested composite |
135 | -- types. Used by Expand_Record/Array_Equality, Bodies is a list on which | |
136 | -- to attach bodies of local functions that are created in the process. | |
137 | -- This is the responsibility of the caller to insert those bodies at the | |
138 | -- right place. Nod provides the Sloc value for generated code. Lhs and Rhs | |
139 | -- are the left and right sides for the comparison, and Typ is the type of | |
140 | -- the arrays to compare. | |
70482933 | 141 | |
fdac1f80 AC |
142 | procedure Expand_Concatenate (Cnode : Node_Id; Opnds : List_Id); |
143 | -- Routine to expand concatenation of a sequence of two or more operands | |
144 | -- (in the list Operands) and replace node Cnode with the result of the | |
145 | -- concatenation. The operands can be of any appropriate type, and can | |
146 | -- include both arrays and singleton elements. | |
70482933 RK |
147 | |
148 | procedure Fixup_Universal_Fixed_Operation (N : Node_Id); | |
685094bf RD |
149 | -- N is a N_Op_Divide or N_Op_Multiply node whose result is universal |
150 | -- fixed. We do not have such a type at runtime, so the purpose of this | |
151 | -- routine is to find the real type by looking up the tree. We also | |
152 | -- determine if the operation must be rounded. | |
70482933 | 153 | |
fbf5a39b AC |
154 | function Get_Allocator_Final_List |
155 | (N : Node_Id; | |
156 | T : Entity_Id; | |
2e071734 | 157 | PtrT : Entity_Id) return Entity_Id; |
685094bf RD |
158 | -- If the designated type is controlled, build final_list expression for |
159 | -- created object. If context is an access parameter, create a local access | |
160 | -- type to have a usable finalization list. | |
fbf5a39b | 161 | |
5d09245e AC |
162 | function Has_Inferable_Discriminants (N : Node_Id) return Boolean; |
163 | -- Ada 2005 (AI-216): A view of an Unchecked_Union object has inferable | |
164 | -- discriminants if it has a constrained nominal type, unless the object | |
165 | -- is a component of an enclosing Unchecked_Union object that is subject | |
166 | -- to a per-object constraint and the enclosing object lacks inferable | |
167 | -- discriminants. | |
168 | -- | |
169 | -- An expression of an Unchecked_Union type has inferable discriminants | |
170 | -- if it is either a name of an object with inferable discriminants or a | |
171 | -- qualified expression whose subtype mark denotes a constrained subtype. | |
172 | ||
70482933 | 173 | procedure Insert_Dereference_Action (N : Node_Id); |
e6f69614 AC |
174 | -- N is an expression whose type is an access. When the type of the |
175 | -- associated storage pool is derived from Checked_Pool, generate a | |
176 | -- call to the 'Dereference' primitive operation. | |
70482933 RK |
177 | |
178 | function Make_Array_Comparison_Op | |
2e071734 AC |
179 | (Typ : Entity_Id; |
180 | Nod : Node_Id) return Node_Id; | |
685094bf RD |
181 | -- Comparisons between arrays are expanded in line. This function produces |
182 | -- the body of the implementation of (a > b), where a and b are one- | |
183 | -- dimensional arrays of some discrete type. The original node is then | |
184 | -- expanded into the appropriate call to this function. Nod provides the | |
185 | -- Sloc value for the generated code. | |
70482933 RK |
186 | |
187 | function Make_Boolean_Array_Op | |
2e071734 AC |
188 | (Typ : Entity_Id; |
189 | N : Node_Id) return Node_Id; | |
685094bf RD |
190 | -- Boolean operations on boolean arrays are expanded in line. This function |
191 | -- produce the body for the node N, which is (a and b), (a or b), or (a xor | |
192 | -- b). It is used only the normal case and not the packed case. The type | |
193 | -- involved, Typ, is the Boolean array type, and the logical operations in | |
194 | -- the body are simple boolean operations. Note that Typ is always a | |
195 | -- constrained type (the caller has ensured this by using | |
196 | -- Convert_To_Actual_Subtype if necessary). | |
70482933 RK |
197 | |
198 | procedure Rewrite_Comparison (N : Node_Id); | |
20b5d666 | 199 | -- If N is the node for a comparison whose outcome can be determined at |
d26dc4b5 AC |
200 | -- compile time, then the node N can be rewritten with True or False. If |
201 | -- the outcome cannot be determined at compile time, the call has no | |
202 | -- effect. If N is a type conversion, then this processing is applied to | |
203 | -- its expression. If N is neither comparison nor a type conversion, the | |
204 | -- call has no effect. | |
70482933 RK |
205 | |
206 | function Tagged_Membership (N : Node_Id) return Node_Id; | |
207 | -- Construct the expression corresponding to the tagged membership test. | |
208 | -- Deals with a second operand being (or not) a class-wide type. | |
209 | ||
fbf5a39b | 210 | function Safe_In_Place_Array_Op |
2e071734 AC |
211 | (Lhs : Node_Id; |
212 | Op1 : Node_Id; | |
213 | Op2 : Node_Id) return Boolean; | |
685094bf RD |
214 | -- In the context of an assignment, where the right-hand side is a boolean |
215 | -- operation on arrays, check whether operation can be performed in place. | |
fbf5a39b | 216 | |
70482933 RK |
217 | procedure Unary_Op_Validity_Checks (N : Node_Id); |
218 | pragma Inline (Unary_Op_Validity_Checks); | |
219 | -- Performs validity checks for a unary operator | |
220 | ||
221 | ------------------------------- | |
222 | -- Binary_Op_Validity_Checks -- | |
223 | ------------------------------- | |
224 | ||
225 | procedure Binary_Op_Validity_Checks (N : Node_Id) is | |
226 | begin | |
227 | if Validity_Checks_On and Validity_Check_Operands then | |
228 | Ensure_Valid (Left_Opnd (N)); | |
229 | Ensure_Valid (Right_Opnd (N)); | |
230 | end if; | |
231 | end Binary_Op_Validity_Checks; | |
232 | ||
fbf5a39b AC |
233 | ------------------------------------ |
234 | -- Build_Boolean_Array_Proc_Call -- | |
235 | ------------------------------------ | |
236 | ||
237 | procedure Build_Boolean_Array_Proc_Call | |
238 | (N : Node_Id; | |
239 | Op1 : Node_Id; | |
240 | Op2 : Node_Id) | |
241 | is | |
242 | Loc : constant Source_Ptr := Sloc (N); | |
243 | Kind : constant Node_Kind := Nkind (Expression (N)); | |
244 | Target : constant Node_Id := | |
245 | Make_Attribute_Reference (Loc, | |
246 | Prefix => Name (N), | |
247 | Attribute_Name => Name_Address); | |
248 | ||
249 | Arg1 : constant Node_Id := Op1; | |
250 | Arg2 : Node_Id := Op2; | |
251 | Call_Node : Node_Id; | |
252 | Proc_Name : Entity_Id; | |
253 | ||
254 | begin | |
255 | if Kind = N_Op_Not then | |
256 | if Nkind (Op1) in N_Binary_Op then | |
257 | ||
5e1c00fa | 258 | -- Use negated version of the binary operators |
fbf5a39b AC |
259 | |
260 | if Nkind (Op1) = N_Op_And then | |
261 | Proc_Name := RTE (RE_Vector_Nand); | |
262 | ||
263 | elsif Nkind (Op1) = N_Op_Or then | |
264 | Proc_Name := RTE (RE_Vector_Nor); | |
265 | ||
266 | else pragma Assert (Nkind (Op1) = N_Op_Xor); | |
267 | Proc_Name := RTE (RE_Vector_Xor); | |
268 | end if; | |
269 | ||
270 | Call_Node := | |
271 | Make_Procedure_Call_Statement (Loc, | |
272 | Name => New_Occurrence_Of (Proc_Name, Loc), | |
273 | ||
274 | Parameter_Associations => New_List ( | |
275 | Target, | |
276 | Make_Attribute_Reference (Loc, | |
277 | Prefix => Left_Opnd (Op1), | |
278 | Attribute_Name => Name_Address), | |
279 | ||
280 | Make_Attribute_Reference (Loc, | |
281 | Prefix => Right_Opnd (Op1), | |
282 | Attribute_Name => Name_Address), | |
283 | ||
284 | Make_Attribute_Reference (Loc, | |
285 | Prefix => Left_Opnd (Op1), | |
286 | Attribute_Name => Name_Length))); | |
287 | ||
288 | else | |
289 | Proc_Name := RTE (RE_Vector_Not); | |
290 | ||
291 | Call_Node := | |
292 | Make_Procedure_Call_Statement (Loc, | |
293 | Name => New_Occurrence_Of (Proc_Name, Loc), | |
294 | Parameter_Associations => New_List ( | |
295 | Target, | |
296 | ||
297 | Make_Attribute_Reference (Loc, | |
298 | Prefix => Op1, | |
299 | Attribute_Name => Name_Address), | |
300 | ||
301 | Make_Attribute_Reference (Loc, | |
302 | Prefix => Op1, | |
303 | Attribute_Name => Name_Length))); | |
304 | end if; | |
305 | ||
306 | else | |
307 | -- We use the following equivalences: | |
308 | ||
309 | -- (not X) or (not Y) = not (X and Y) = Nand (X, Y) | |
310 | -- (not X) and (not Y) = not (X or Y) = Nor (X, Y) | |
311 | -- (not X) xor (not Y) = X xor Y | |
312 | -- X xor (not Y) = not (X xor Y) = Nxor (X, Y) | |
313 | ||
314 | if Nkind (Op1) = N_Op_Not then | |
315 | if Kind = N_Op_And then | |
316 | Proc_Name := RTE (RE_Vector_Nor); | |
317 | ||
318 | elsif Kind = N_Op_Or then | |
319 | Proc_Name := RTE (RE_Vector_Nand); | |
320 | ||
321 | else | |
322 | Proc_Name := RTE (RE_Vector_Xor); | |
323 | end if; | |
324 | ||
325 | else | |
326 | if Kind = N_Op_And then | |
327 | Proc_Name := RTE (RE_Vector_And); | |
328 | ||
329 | elsif Kind = N_Op_Or then | |
330 | Proc_Name := RTE (RE_Vector_Or); | |
331 | ||
332 | elsif Nkind (Op2) = N_Op_Not then | |
333 | Proc_Name := RTE (RE_Vector_Nxor); | |
334 | Arg2 := Right_Opnd (Op2); | |
335 | ||
336 | else | |
337 | Proc_Name := RTE (RE_Vector_Xor); | |
338 | end if; | |
339 | end if; | |
340 | ||
341 | Call_Node := | |
342 | Make_Procedure_Call_Statement (Loc, | |
343 | Name => New_Occurrence_Of (Proc_Name, Loc), | |
344 | Parameter_Associations => New_List ( | |
345 | Target, | |
346 | Make_Attribute_Reference (Loc, | |
347 | Prefix => Arg1, | |
348 | Attribute_Name => Name_Address), | |
349 | Make_Attribute_Reference (Loc, | |
350 | Prefix => Arg2, | |
351 | Attribute_Name => Name_Address), | |
352 | Make_Attribute_Reference (Loc, | |
353 | Prefix => Op1, | |
354 | Attribute_Name => Name_Length))); | |
355 | end if; | |
356 | ||
357 | Rewrite (N, Call_Node); | |
358 | Analyze (N); | |
359 | ||
360 | exception | |
361 | when RE_Not_Available => | |
362 | return; | |
363 | end Build_Boolean_Array_Proc_Call; | |
364 | ||
26bff3d9 JM |
365 | -------------------------------- |
366 | -- Displace_Allocator_Pointer -- | |
367 | -------------------------------- | |
368 | ||
369 | procedure Displace_Allocator_Pointer (N : Node_Id) is | |
370 | Loc : constant Source_Ptr := Sloc (N); | |
371 | Orig_Node : constant Node_Id := Original_Node (N); | |
372 | Dtyp : Entity_Id; | |
373 | Etyp : Entity_Id; | |
374 | PtrT : Entity_Id; | |
375 | ||
376 | begin | |
303b4d58 AC |
377 | -- Do nothing in case of VM targets: the virtual machine will handle |
378 | -- interfaces directly. | |
379 | ||
380 | if VM_Target /= No_VM then | |
381 | return; | |
382 | end if; | |
383 | ||
26bff3d9 JM |
384 | pragma Assert (Nkind (N) = N_Identifier |
385 | and then Nkind (Orig_Node) = N_Allocator); | |
386 | ||
387 | PtrT := Etype (Orig_Node); | |
388 | Dtyp := Designated_Type (PtrT); | |
389 | Etyp := Etype (Expression (Orig_Node)); | |
390 | ||
391 | if Is_Class_Wide_Type (Dtyp) | |
392 | and then Is_Interface (Dtyp) | |
393 | then | |
394 | -- If the type of the allocator expression is not an interface type | |
395 | -- we can generate code to reference the record component containing | |
396 | -- the pointer to the secondary dispatch table. | |
397 | ||
398 | if not Is_Interface (Etyp) then | |
399 | declare | |
400 | Saved_Typ : constant Entity_Id := Etype (Orig_Node); | |
401 | ||
402 | begin | |
403 | -- 1) Get access to the allocated object | |
404 | ||
405 | Rewrite (N, | |
406 | Make_Explicit_Dereference (Loc, | |
407 | Relocate_Node (N))); | |
408 | Set_Etype (N, Etyp); | |
409 | Set_Analyzed (N); | |
410 | ||
411 | -- 2) Add the conversion to displace the pointer to reference | |
412 | -- the secondary dispatch table. | |
413 | ||
414 | Rewrite (N, Convert_To (Dtyp, Relocate_Node (N))); | |
415 | Analyze_And_Resolve (N, Dtyp); | |
416 | ||
417 | -- 3) The 'access to the secondary dispatch table will be used | |
418 | -- as the value returned by the allocator. | |
419 | ||
420 | Rewrite (N, | |
421 | Make_Attribute_Reference (Loc, | |
422 | Prefix => Relocate_Node (N), | |
423 | Attribute_Name => Name_Access)); | |
424 | Set_Etype (N, Saved_Typ); | |
425 | Set_Analyzed (N); | |
426 | end; | |
427 | ||
428 | -- If the type of the allocator expression is an interface type we | |
429 | -- generate a run-time call to displace "this" to reference the | |
430 | -- component containing the pointer to the secondary dispatch table | |
431 | -- or else raise Constraint_Error if the actual object does not | |
432 | -- implement the target interface. This case corresponds with the | |
433 | -- following example: | |
434 | ||
8fc789c8 | 435 | -- function Op (Obj : Iface_1'Class) return access Iface_2'Class is |
26bff3d9 JM |
436 | -- begin |
437 | -- return new Iface_2'Class'(Obj); | |
438 | -- end Op; | |
439 | ||
440 | else | |
441 | Rewrite (N, | |
442 | Unchecked_Convert_To (PtrT, | |
443 | Make_Function_Call (Loc, | |
444 | Name => New_Reference_To (RTE (RE_Displace), Loc), | |
445 | Parameter_Associations => New_List ( | |
446 | Unchecked_Convert_To (RTE (RE_Address), | |
447 | Relocate_Node (N)), | |
448 | ||
449 | New_Occurrence_Of | |
450 | (Elists.Node | |
451 | (First_Elmt | |
452 | (Access_Disp_Table (Etype (Base_Type (Dtyp))))), | |
453 | Loc))))); | |
454 | Analyze_And_Resolve (N, PtrT); | |
455 | end if; | |
456 | end if; | |
457 | end Displace_Allocator_Pointer; | |
458 | ||
fbf5a39b AC |
459 | --------------------------------- |
460 | -- Expand_Allocator_Expression -- | |
461 | --------------------------------- | |
462 | ||
463 | procedure Expand_Allocator_Expression (N : Node_Id) is | |
f02b8bb8 RD |
464 | Loc : constant Source_Ptr := Sloc (N); |
465 | Exp : constant Node_Id := Expression (Expression (N)); | |
f02b8bb8 RD |
466 | PtrT : constant Entity_Id := Etype (N); |
467 | DesigT : constant Entity_Id := Designated_Type (PtrT); | |
26bff3d9 JM |
468 | |
469 | procedure Apply_Accessibility_Check | |
470 | (Ref : Node_Id; | |
471 | Built_In_Place : Boolean := False); | |
472 | -- Ada 2005 (AI-344): For an allocator with a class-wide designated | |
685094bf RD |
473 | -- type, generate an accessibility check to verify that the level of the |
474 | -- type of the created object is not deeper than the level of the access | |
475 | -- type. If the type of the qualified expression is class- wide, then | |
476 | -- always generate the check (except in the case where it is known to be | |
477 | -- unnecessary, see comment below). Otherwise, only generate the check | |
478 | -- if the level of the qualified expression type is statically deeper | |
479 | -- than the access type. | |
480 | -- | |
481 | -- Although the static accessibility will generally have been performed | |
482 | -- as a legality check, it won't have been done in cases where the | |
483 | -- allocator appears in generic body, so a run-time check is needed in | |
484 | -- general. One special case is when the access type is declared in the | |
485 | -- same scope as the class-wide allocator, in which case the check can | |
486 | -- never fail, so it need not be generated. | |
487 | -- | |
488 | -- As an open issue, there seem to be cases where the static level | |
489 | -- associated with the class-wide object's underlying type is not | |
490 | -- sufficient to perform the proper accessibility check, such as for | |
491 | -- allocators in nested subprograms or accept statements initialized by | |
492 | -- class-wide formals when the actual originates outside at a deeper | |
493 | -- static level. The nested subprogram case might require passing | |
494 | -- accessibility levels along with class-wide parameters, and the task | |
495 | -- case seems to be an actual gap in the language rules that needs to | |
496 | -- be fixed by the ARG. ??? | |
26bff3d9 JM |
497 | |
498 | ------------------------------- | |
499 | -- Apply_Accessibility_Check -- | |
500 | ------------------------------- | |
501 | ||
502 | procedure Apply_Accessibility_Check | |
503 | (Ref : Node_Id; | |
504 | Built_In_Place : Boolean := False) | |
505 | is | |
506 | Ref_Node : Node_Id; | |
507 | ||
508 | begin | |
509 | -- Note: we skip the accessibility check for the VM case, since | |
510 | -- there does not seem to be any practical way of implementing it. | |
511 | ||
512 | if Ada_Version >= Ada_05 | |
513 | and then VM_Target = No_VM | |
514 | and then Is_Class_Wide_Type (DesigT) | |
515 | and then not Scope_Suppress (Accessibility_Check) | |
516 | and then | |
517 | (Type_Access_Level (Etype (Exp)) > Type_Access_Level (PtrT) | |
518 | or else | |
519 | (Is_Class_Wide_Type (Etype (Exp)) | |
520 | and then Scope (PtrT) /= Current_Scope)) | |
521 | then | |
522 | -- If the allocator was built in place Ref is already a reference | |
523 | -- to the access object initialized to the result of the allocator | |
524 | -- (see Exp_Ch6.Make_Build_In_Place_Call_In_Allocator). Otherwise | |
525 | -- it is the entity associated with the object containing the | |
526 | -- address of the allocated object. | |
527 | ||
528 | if Built_In_Place then | |
529 | Ref_Node := New_Copy (Ref); | |
530 | else | |
531 | Ref_Node := New_Reference_To (Ref, Loc); | |
532 | end if; | |
533 | ||
534 | Insert_Action (N, | |
535 | Make_Raise_Program_Error (Loc, | |
536 | Condition => | |
537 | Make_Op_Gt (Loc, | |
538 | Left_Opnd => | |
539 | Build_Get_Access_Level (Loc, | |
540 | Make_Attribute_Reference (Loc, | |
541 | Prefix => Ref_Node, | |
542 | Attribute_Name => Name_Tag)), | |
543 | Right_Opnd => | |
544 | Make_Integer_Literal (Loc, | |
545 | Type_Access_Level (PtrT))), | |
546 | Reason => PE_Accessibility_Check_Failed)); | |
547 | end if; | |
548 | end Apply_Accessibility_Check; | |
549 | ||
550 | -- Local variables | |
551 | ||
552 | Indic : constant Node_Id := Subtype_Mark (Expression (N)); | |
553 | T : constant Entity_Id := Entity (Indic); | |
554 | Flist : Node_Id; | |
555 | Node : Node_Id; | |
556 | Temp : Entity_Id; | |
fbf5a39b | 557 | |
d26dc4b5 AC |
558 | TagT : Entity_Id := Empty; |
559 | -- Type used as source for tag assignment | |
560 | ||
561 | TagR : Node_Id := Empty; | |
562 | -- Target reference for tag assignment | |
563 | ||
fbf5a39b AC |
564 | Aggr_In_Place : constant Boolean := Is_Delayed_Aggregate (Exp); |
565 | ||
566 | Tag_Assign : Node_Id; | |
567 | Tmp_Node : Node_Id; | |
568 | ||
26bff3d9 JM |
569 | -- Start of processing for Expand_Allocator_Expression |
570 | ||
fbf5a39b | 571 | begin |
048e5cef | 572 | if Is_Tagged_Type (T) or else Needs_Finalization (T) then |
fbf5a39b | 573 | |
685094bf RD |
574 | -- Ada 2005 (AI-318-02): If the initialization expression is a call |
575 | -- to a build-in-place function, then access to the allocated object | |
576 | -- must be passed to the function. Currently we limit such functions | |
577 | -- to those with constrained limited result subtypes, but eventually | |
578 | -- we plan to expand the allowed forms of functions that are treated | |
579 | -- as build-in-place. | |
20b5d666 JM |
580 | |
581 | if Ada_Version >= Ada_05 | |
582 | and then Is_Build_In_Place_Function_Call (Exp) | |
583 | then | |
584 | Make_Build_In_Place_Call_In_Allocator (N, Exp); | |
26bff3d9 JM |
585 | Apply_Accessibility_Check (N, Built_In_Place => True); |
586 | return; | |
20b5d666 JM |
587 | end if; |
588 | ||
fbf5a39b AC |
589 | -- Actions inserted before: |
590 | -- Temp : constant ptr_T := new T'(Expression); | |
591 | -- <no CW> Temp._tag := T'tag; | |
592 | -- <CTRL> Adjust (Finalizable (Temp.all)); | |
593 | -- <CTRL> Attach_To_Final_List (Finalizable (Temp.all)); | |
594 | ||
595 | -- We analyze by hand the new internal allocator to avoid | |
596 | -- any recursion and inappropriate call to Initialize | |
7324bf49 | 597 | |
20b5d666 JM |
598 | -- We don't want to remove side effects when the expression must be |
599 | -- built in place. In the case of a build-in-place function call, | |
600 | -- that could lead to a duplication of the call, which was already | |
601 | -- substituted for the allocator. | |
602 | ||
26bff3d9 | 603 | if not Aggr_In_Place then |
fbf5a39b AC |
604 | Remove_Side_Effects (Exp); |
605 | end if; | |
606 | ||
607 | Temp := | |
608 | Make_Defining_Identifier (Loc, New_Internal_Name ('P')); | |
609 | ||
610 | -- For a class wide allocation generate the following code: | |
611 | ||
612 | -- type Equiv_Record is record ... end record; | |
613 | -- implicit subtype CW is <Class_Wide_Subytpe>; | |
614 | -- temp : PtrT := new CW'(CW!(expr)); | |
615 | ||
616 | if Is_Class_Wide_Type (T) then | |
617 | Expand_Subtype_From_Expr (Empty, T, Indic, Exp); | |
618 | ||
26bff3d9 JM |
619 | -- Ada 2005 (AI-251): If the expression is a class-wide interface |
620 | -- object we generate code to move up "this" to reference the | |
621 | -- base of the object before allocating the new object. | |
622 | ||
623 | -- Note that Exp'Address is recursively expanded into a call | |
624 | -- to Base_Address (Exp.Tag) | |
625 | ||
626 | if Is_Class_Wide_Type (Etype (Exp)) | |
627 | and then Is_Interface (Etype (Exp)) | |
303b4d58 | 628 | and then VM_Target = No_VM |
26bff3d9 JM |
629 | then |
630 | Set_Expression | |
631 | (Expression (N), | |
632 | Unchecked_Convert_To (Entity (Indic), | |
633 | Make_Explicit_Dereference (Loc, | |
634 | Unchecked_Convert_To (RTE (RE_Tag_Ptr), | |
635 | Make_Attribute_Reference (Loc, | |
636 | Prefix => Exp, | |
637 | Attribute_Name => Name_Address))))); | |
638 | ||
639 | else | |
640 | Set_Expression | |
641 | (Expression (N), | |
642 | Unchecked_Convert_To (Entity (Indic), Exp)); | |
643 | end if; | |
fbf5a39b AC |
644 | |
645 | Analyze_And_Resolve (Expression (N), Entity (Indic)); | |
646 | end if; | |
647 | ||
26bff3d9 | 648 | -- Keep separate the management of allocators returning interfaces |
fbf5a39b | 649 | |
26bff3d9 JM |
650 | if not Is_Interface (Directly_Designated_Type (PtrT)) then |
651 | if Aggr_In_Place then | |
652 | Tmp_Node := | |
653 | Make_Object_Declaration (Loc, | |
654 | Defining_Identifier => Temp, | |
655 | Object_Definition => New_Reference_To (PtrT, Loc), | |
656 | Expression => | |
657 | Make_Allocator (Loc, | |
658 | New_Reference_To (Etype (Exp), Loc))); | |
fbf5a39b | 659 | |
fad0600d AC |
660 | -- Copy the Comes_From_Source flag for the allocator we just |
661 | -- built, since logically this allocator is a replacement of | |
662 | -- the original allocator node. This is for proper handling of | |
663 | -- restriction No_Implicit_Heap_Allocations. | |
664 | ||
26bff3d9 JM |
665 | Set_Comes_From_Source |
666 | (Expression (Tmp_Node), Comes_From_Source (N)); | |
fbf5a39b | 667 | |
26bff3d9 JM |
668 | Set_No_Initialization (Expression (Tmp_Node)); |
669 | Insert_Action (N, Tmp_Node); | |
fbf5a39b | 670 | |
048e5cef | 671 | if Needs_Finalization (T) |
26bff3d9 JM |
672 | and then Ekind (PtrT) = E_Anonymous_Access_Type |
673 | then | |
674 | -- Create local finalization list for access parameter | |
675 | ||
676 | Flist := Get_Allocator_Final_List (N, Base_Type (T), PtrT); | |
677 | end if; | |
678 | ||
d766cee3 | 679 | Convert_Aggr_In_Allocator (N, Tmp_Node, Exp); |
fad0600d | 680 | |
26bff3d9 JM |
681 | else |
682 | Node := Relocate_Node (N); | |
683 | Set_Analyzed (Node); | |
684 | Insert_Action (N, | |
685 | Make_Object_Declaration (Loc, | |
686 | Defining_Identifier => Temp, | |
687 | Constant_Present => True, | |
688 | Object_Definition => New_Reference_To (PtrT, Loc), | |
689 | Expression => Node)); | |
fbf5a39b AC |
690 | end if; |
691 | ||
26bff3d9 JM |
692 | -- Ada 2005 (AI-251): Handle allocators whose designated type is an |
693 | -- interface type. In this case we use the type of the qualified | |
694 | -- expression to allocate the object. | |
695 | ||
fbf5a39b | 696 | else |
26bff3d9 JM |
697 | declare |
698 | Def_Id : constant Entity_Id := | |
699 | Make_Defining_Identifier (Loc, | |
700 | New_Internal_Name ('T')); | |
701 | New_Decl : Node_Id; | |
fbf5a39b | 702 | |
26bff3d9 JM |
703 | begin |
704 | New_Decl := | |
705 | Make_Full_Type_Declaration (Loc, | |
706 | Defining_Identifier => Def_Id, | |
707 | Type_Definition => | |
708 | Make_Access_To_Object_Definition (Loc, | |
709 | All_Present => True, | |
710 | Null_Exclusion_Present => False, | |
711 | Constant_Present => False, | |
712 | Subtype_Indication => | |
713 | New_Reference_To (Etype (Exp), Loc))); | |
714 | ||
715 | Insert_Action (N, New_Decl); | |
716 | ||
717 | -- Inherit the final chain to ensure that the expansion of the | |
718 | -- aggregate is correct in case of controlled types | |
719 | ||
048e5cef | 720 | if Needs_Finalization (Directly_Designated_Type (PtrT)) then |
26bff3d9 JM |
721 | Set_Associated_Final_Chain (Def_Id, |
722 | Associated_Final_Chain (PtrT)); | |
723 | end if; | |
758c442c | 724 | |
26bff3d9 JM |
725 | -- Declare the object using the previous type declaration |
726 | ||
727 | if Aggr_In_Place then | |
728 | Tmp_Node := | |
729 | Make_Object_Declaration (Loc, | |
730 | Defining_Identifier => Temp, | |
731 | Object_Definition => New_Reference_To (Def_Id, Loc), | |
732 | Expression => | |
733 | Make_Allocator (Loc, | |
734 | New_Reference_To (Etype (Exp), Loc))); | |
735 | ||
fad0600d AC |
736 | -- Copy the Comes_From_Source flag for the allocator we just |
737 | -- built, since logically this allocator is a replacement of | |
738 | -- the original allocator node. This is for proper handling | |
739 | -- of restriction No_Implicit_Heap_Allocations. | |
740 | ||
26bff3d9 JM |
741 | Set_Comes_From_Source |
742 | (Expression (Tmp_Node), Comes_From_Source (N)); | |
743 | ||
744 | Set_No_Initialization (Expression (Tmp_Node)); | |
745 | Insert_Action (N, Tmp_Node); | |
746 | ||
048e5cef | 747 | if Needs_Finalization (T) |
26bff3d9 JM |
748 | and then Ekind (PtrT) = E_Anonymous_Access_Type |
749 | then | |
750 | -- Create local finalization list for access parameter | |
751 | ||
752 | Flist := | |
753 | Get_Allocator_Final_List (N, Base_Type (T), PtrT); | |
754 | end if; | |
755 | ||
d766cee3 | 756 | Convert_Aggr_In_Allocator (N, Tmp_Node, Exp); |
26bff3d9 JM |
757 | else |
758 | Node := Relocate_Node (N); | |
759 | Set_Analyzed (Node); | |
760 | Insert_Action (N, | |
761 | Make_Object_Declaration (Loc, | |
762 | Defining_Identifier => Temp, | |
763 | Constant_Present => True, | |
764 | Object_Definition => New_Reference_To (Def_Id, Loc), | |
765 | Expression => Node)); | |
766 | end if; | |
767 | ||
768 | -- Generate an additional object containing the address of the | |
769 | -- returned object. The type of this second object declaration | |
685094bf RD |
770 | -- is the correct type required for the common processing that |
771 | -- is still performed by this subprogram. The displacement of | |
772 | -- this pointer to reference the component associated with the | |
773 | -- interface type will be done at the end of common processing. | |
26bff3d9 JM |
774 | |
775 | New_Decl := | |
776 | Make_Object_Declaration (Loc, | |
777 | Defining_Identifier => Make_Defining_Identifier (Loc, | |
778 | New_Internal_Name ('P')), | |
779 | Object_Definition => New_Reference_To (PtrT, Loc), | |
780 | Expression => Unchecked_Convert_To (PtrT, | |
781 | New_Reference_To (Temp, Loc))); | |
782 | ||
783 | Insert_Action (N, New_Decl); | |
784 | ||
785 | Tmp_Node := New_Decl; | |
786 | Temp := Defining_Identifier (New_Decl); | |
787 | end; | |
758c442c GD |
788 | end if; |
789 | ||
26bff3d9 JM |
790 | Apply_Accessibility_Check (Temp); |
791 | ||
792 | -- Generate the tag assignment | |
793 | ||
794 | -- Suppress the tag assignment when VM_Target because VM tags are | |
795 | -- represented implicitly in objects. | |
796 | ||
797 | if VM_Target /= No_VM then | |
798 | null; | |
fbf5a39b | 799 | |
26bff3d9 JM |
800 | -- Ada 2005 (AI-251): Suppress the tag assignment with class-wide |
801 | -- interface objects because in this case the tag does not change. | |
d26dc4b5 | 802 | |
26bff3d9 JM |
803 | elsif Is_Interface (Directly_Designated_Type (Etype (N))) then |
804 | pragma Assert (Is_Class_Wide_Type | |
805 | (Directly_Designated_Type (Etype (N)))); | |
d26dc4b5 AC |
806 | null; |
807 | ||
808 | elsif Is_Tagged_Type (T) and then not Is_Class_Wide_Type (T) then | |
809 | TagT := T; | |
810 | TagR := New_Reference_To (Temp, Loc); | |
811 | ||
812 | elsif Is_Private_Type (T) | |
813 | and then Is_Tagged_Type (Underlying_Type (T)) | |
fbf5a39b | 814 | then |
d26dc4b5 | 815 | TagT := Underlying_Type (T); |
dfd99a80 TQ |
816 | TagR := |
817 | Unchecked_Convert_To (Underlying_Type (T), | |
818 | Make_Explicit_Dereference (Loc, | |
819 | Prefix => New_Reference_To (Temp, Loc))); | |
d26dc4b5 AC |
820 | end if; |
821 | ||
822 | if Present (TagT) then | |
fbf5a39b AC |
823 | Tag_Assign := |
824 | Make_Assignment_Statement (Loc, | |
825 | Name => | |
826 | Make_Selected_Component (Loc, | |
d26dc4b5 | 827 | Prefix => TagR, |
fbf5a39b | 828 | Selector_Name => |
d26dc4b5 | 829 | New_Reference_To (First_Tag_Component (TagT), Loc)), |
fbf5a39b AC |
830 | |
831 | Expression => | |
832 | Unchecked_Convert_To (RTE (RE_Tag), | |
a9d8907c | 833 | New_Reference_To |
d26dc4b5 | 834 | (Elists.Node (First_Elmt (Access_Disp_Table (TagT))), |
a9d8907c | 835 | Loc))); |
fbf5a39b AC |
836 | |
837 | -- The previous assignment has to be done in any case | |
838 | ||
839 | Set_Assignment_OK (Name (Tag_Assign)); | |
840 | Insert_Action (N, Tag_Assign); | |
fbf5a39b AC |
841 | end if; |
842 | ||
048e5cef BD |
843 | if Needs_Finalization (DesigT) |
844 | and then Needs_Finalization (T) | |
fbf5a39b AC |
845 | then |
846 | declare | |
847 | Attach : Node_Id; | |
848 | Apool : constant Entity_Id := | |
849 | Associated_Storage_Pool (PtrT); | |
850 | ||
851 | begin | |
685094bf RD |
852 | -- If it is an allocation on the secondary stack (i.e. a value |
853 | -- returned from a function), the object is attached on the | |
854 | -- caller side as soon as the call is completed (see | |
855 | -- Expand_Ctrl_Function_Call) | |
fbf5a39b AC |
856 | |
857 | if Is_RTE (Apool, RE_SS_Pool) then | |
858 | declare | |
859 | F : constant Entity_Id := | |
860 | Make_Defining_Identifier (Loc, | |
861 | New_Internal_Name ('F')); | |
862 | begin | |
863 | Insert_Action (N, | |
864 | Make_Object_Declaration (Loc, | |
865 | Defining_Identifier => F, | |
866 | Object_Definition => New_Reference_To (RTE | |
867 | (RE_Finalizable_Ptr), Loc))); | |
868 | ||
869 | Flist := New_Reference_To (F, Loc); | |
870 | Attach := Make_Integer_Literal (Loc, 1); | |
871 | end; | |
872 | ||
873 | -- Normal case, not a secondary stack allocation | |
874 | ||
875 | else | |
048e5cef | 876 | if Needs_Finalization (T) |
615cbd95 AC |
877 | and then Ekind (PtrT) = E_Anonymous_Access_Type |
878 | then | |
5e1c00fa | 879 | -- Create local finalization list for access parameter |
615cbd95 AC |
880 | |
881 | Flist := | |
882 | Get_Allocator_Final_List (N, Base_Type (T), PtrT); | |
883 | else | |
884 | Flist := Find_Final_List (PtrT); | |
885 | end if; | |
886 | ||
fbf5a39b AC |
887 | Attach := Make_Integer_Literal (Loc, 2); |
888 | end if; | |
889 | ||
26bff3d9 JM |
890 | -- Generate an Adjust call if the object will be moved. In Ada |
891 | -- 2005, the object may be inherently limited, in which case | |
892 | -- there is no Adjust procedure, and the object is built in | |
893 | -- place. In Ada 95, the object can be limited but not | |
894 | -- inherently limited if this allocator came from a return | |
895 | -- statement (we're allocating the result on the secondary | |
896 | -- stack). In that case, the object will be moved, so we _do_ | |
897 | -- want to Adjust. | |
898 | ||
899 | if not Aggr_In_Place | |
900 | and then not Is_Inherently_Limited_Type (T) | |
901 | then | |
fbf5a39b AC |
902 | Insert_Actions (N, |
903 | Make_Adjust_Call ( | |
904 | Ref => | |
905 | ||
685094bf RD |
906 | -- An unchecked conversion is needed in the classwide |
907 | -- case because the designated type can be an ancestor of | |
908 | -- the subtype mark of the allocator. | |
fbf5a39b AC |
909 | |
910 | Unchecked_Convert_To (T, | |
911 | Make_Explicit_Dereference (Loc, | |
dfd99a80 | 912 | Prefix => New_Reference_To (Temp, Loc))), |
fbf5a39b AC |
913 | |
914 | Typ => T, | |
915 | Flist_Ref => Flist, | |
dfd99a80 TQ |
916 | With_Attach => Attach, |
917 | Allocator => True)); | |
fbf5a39b AC |
918 | end if; |
919 | end; | |
920 | end if; | |
921 | ||
922 | Rewrite (N, New_Reference_To (Temp, Loc)); | |
923 | Analyze_And_Resolve (N, PtrT); | |
924 | ||
685094bf RD |
925 | -- Ada 2005 (AI-251): Displace the pointer to reference the record |
926 | -- component containing the secondary dispatch table of the interface | |
927 | -- type. | |
26bff3d9 JM |
928 | |
929 | if Is_Interface (Directly_Designated_Type (PtrT)) then | |
930 | Displace_Allocator_Pointer (N); | |
931 | end if; | |
932 | ||
fbf5a39b AC |
933 | elsif Aggr_In_Place then |
934 | Temp := | |
935 | Make_Defining_Identifier (Loc, New_Internal_Name ('P')); | |
936 | Tmp_Node := | |
937 | Make_Object_Declaration (Loc, | |
938 | Defining_Identifier => Temp, | |
939 | Object_Definition => New_Reference_To (PtrT, Loc), | |
940 | Expression => Make_Allocator (Loc, | |
941 | New_Reference_To (Etype (Exp), Loc))); | |
942 | ||
fad0600d AC |
943 | -- Copy the Comes_From_Source flag for the allocator we just built, |
944 | -- since logically this allocator is a replacement of the original | |
945 | -- allocator node. This is for proper handling of restriction | |
946 | -- No_Implicit_Heap_Allocations. | |
947 | ||
fbf5a39b AC |
948 | Set_Comes_From_Source |
949 | (Expression (Tmp_Node), Comes_From_Source (N)); | |
950 | ||
951 | Set_No_Initialization (Expression (Tmp_Node)); | |
952 | Insert_Action (N, Tmp_Node); | |
d766cee3 | 953 | Convert_Aggr_In_Allocator (N, Tmp_Node, Exp); |
fbf5a39b AC |
954 | Rewrite (N, New_Reference_To (Temp, Loc)); |
955 | Analyze_And_Resolve (N, PtrT); | |
956 | ||
51e4c4b9 AC |
957 | elsif Is_Access_Type (T) |
958 | and then Can_Never_Be_Null (T) | |
959 | then | |
960 | Install_Null_Excluding_Check (Exp); | |
961 | ||
f02b8bb8 | 962 | elsif Is_Access_Type (DesigT) |
fbf5a39b AC |
963 | and then Nkind (Exp) = N_Allocator |
964 | and then Nkind (Expression (Exp)) /= N_Qualified_Expression | |
965 | then | |
0da2c8ac | 966 | -- Apply constraint to designated subtype indication |
fbf5a39b AC |
967 | |
968 | Apply_Constraint_Check (Expression (Exp), | |
f02b8bb8 | 969 | Designated_Type (DesigT), |
fbf5a39b AC |
970 | No_Sliding => True); |
971 | ||
972 | if Nkind (Expression (Exp)) = N_Raise_Constraint_Error then | |
973 | ||
974 | -- Propagate constraint_error to enclosing allocator | |
975 | ||
976 | Rewrite (Exp, New_Copy (Expression (Exp))); | |
977 | end if; | |
978 | else | |
979 | -- First check against the type of the qualified expression | |
980 | -- | |
685094bf RD |
981 | -- NOTE: The commented call should be correct, but for some reason |
982 | -- causes the compiler to bomb (sigsegv) on ACVC test c34007g, so for | |
983 | -- now we just perform the old (incorrect) test against the | |
984 | -- designated subtype with no sliding in the else part of the if | |
985 | -- statement below. ??? | |
fbf5a39b AC |
986 | -- |
987 | -- Apply_Constraint_Check (Exp, T, No_Sliding => True); | |
988 | ||
685094bf RD |
989 | -- A check is also needed in cases where the designated subtype is |
990 | -- constrained and differs from the subtype given in the qualified | |
991 | -- expression. Note that the check on the qualified expression does | |
992 | -- not allow sliding, but this check does (a relaxation from Ada 83). | |
fbf5a39b | 993 | |
f02b8bb8 | 994 | if Is_Constrained (DesigT) |
9450205a | 995 | and then not Subtypes_Statically_Match (T, DesigT) |
fbf5a39b AC |
996 | then |
997 | Apply_Constraint_Check | |
f02b8bb8 | 998 | (Exp, DesigT, No_Sliding => False); |
fbf5a39b | 999 | |
685094bf RD |
1000 | -- The nonsliding check should really be performed (unconditionally) |
1001 | -- against the subtype of the qualified expression, but that causes a | |
1002 | -- problem with c34007g (see above), so for now we retain this. | |
fbf5a39b AC |
1003 | |
1004 | else | |
1005 | Apply_Constraint_Check | |
f02b8bb8 RD |
1006 | (Exp, DesigT, No_Sliding => True); |
1007 | end if; | |
1008 | ||
685094bf RD |
1009 | -- For an access to unconstrained packed array, GIGI needs to see an |
1010 | -- expression with a constrained subtype in order to compute the | |
1011 | -- proper size for the allocator. | |
f02b8bb8 RD |
1012 | |
1013 | if Is_Array_Type (T) | |
1014 | and then not Is_Constrained (T) | |
1015 | and then Is_Packed (T) | |
1016 | then | |
1017 | declare | |
1018 | ConstrT : constant Entity_Id := | |
1019 | Make_Defining_Identifier (Loc, | |
1020 | Chars => New_Internal_Name ('A')); | |
1021 | Internal_Exp : constant Node_Id := Relocate_Node (Exp); | |
1022 | begin | |
1023 | Insert_Action (Exp, | |
1024 | Make_Subtype_Declaration (Loc, | |
1025 | Defining_Identifier => ConstrT, | |
1026 | Subtype_Indication => | |
1027 | Make_Subtype_From_Expr (Exp, T))); | |
1028 | Freeze_Itype (ConstrT, Exp); | |
1029 | Rewrite (Exp, OK_Convert_To (ConstrT, Internal_Exp)); | |
1030 | end; | |
fbf5a39b | 1031 | end if; |
f02b8bb8 | 1032 | |
685094bf RD |
1033 | -- Ada 2005 (AI-318-02): If the initialization expression is a call |
1034 | -- to a build-in-place function, then access to the allocated object | |
1035 | -- must be passed to the function. Currently we limit such functions | |
1036 | -- to those with constrained limited result subtypes, but eventually | |
1037 | -- we plan to expand the allowed forms of functions that are treated | |
1038 | -- as build-in-place. | |
20b5d666 JM |
1039 | |
1040 | if Ada_Version >= Ada_05 | |
1041 | and then Is_Build_In_Place_Function_Call (Exp) | |
1042 | then | |
1043 | Make_Build_In_Place_Call_In_Allocator (N, Exp); | |
1044 | end if; | |
fbf5a39b AC |
1045 | end if; |
1046 | ||
1047 | exception | |
1048 | when RE_Not_Available => | |
1049 | return; | |
1050 | end Expand_Allocator_Expression; | |
1051 | ||
70482933 RK |
1052 | ----------------------------- |
1053 | -- Expand_Array_Comparison -- | |
1054 | ----------------------------- | |
1055 | ||
685094bf RD |
1056 | -- Expansion is only required in the case of array types. For the unpacked |
1057 | -- case, an appropriate runtime routine is called. For packed cases, and | |
1058 | -- also in some other cases where a runtime routine cannot be called, the | |
1059 | -- form of the expansion is: | |
70482933 RK |
1060 | |
1061 | -- [body for greater_nn; boolean_expression] | |
1062 | ||
1063 | -- The body is built by Make_Array_Comparison_Op, and the form of the | |
1064 | -- Boolean expression depends on the operator involved. | |
1065 | ||
1066 | procedure Expand_Array_Comparison (N : Node_Id) is | |
1067 | Loc : constant Source_Ptr := Sloc (N); | |
1068 | Op1 : Node_Id := Left_Opnd (N); | |
1069 | Op2 : Node_Id := Right_Opnd (N); | |
1070 | Typ1 : constant Entity_Id := Base_Type (Etype (Op1)); | |
fbf5a39b | 1071 | Ctyp : constant Entity_Id := Component_Type (Typ1); |
70482933 RK |
1072 | |
1073 | Expr : Node_Id; | |
1074 | Func_Body : Node_Id; | |
1075 | Func_Name : Entity_Id; | |
1076 | ||
fbf5a39b AC |
1077 | Comp : RE_Id; |
1078 | ||
9bc43c53 AC |
1079 | Byte_Addressable : constant Boolean := System_Storage_Unit = Byte'Size; |
1080 | -- True for byte addressable target | |
91b1417d | 1081 | |
fbf5a39b | 1082 | function Length_Less_Than_4 (Opnd : Node_Id) return Boolean; |
685094bf RD |
1083 | -- Returns True if the length of the given operand is known to be less |
1084 | -- than 4. Returns False if this length is known to be four or greater | |
1085 | -- or is not known at compile time. | |
fbf5a39b AC |
1086 | |
1087 | ------------------------ | |
1088 | -- Length_Less_Than_4 -- | |
1089 | ------------------------ | |
1090 | ||
1091 | function Length_Less_Than_4 (Opnd : Node_Id) return Boolean is | |
1092 | Otyp : constant Entity_Id := Etype (Opnd); | |
1093 | ||
1094 | begin | |
1095 | if Ekind (Otyp) = E_String_Literal_Subtype then | |
1096 | return String_Literal_Length (Otyp) < 4; | |
1097 | ||
1098 | else | |
1099 | declare | |
1100 | Ityp : constant Entity_Id := Etype (First_Index (Otyp)); | |
1101 | Lo : constant Node_Id := Type_Low_Bound (Ityp); | |
1102 | Hi : constant Node_Id := Type_High_Bound (Ityp); | |
1103 | Lov : Uint; | |
1104 | Hiv : Uint; | |
1105 | ||
1106 | begin | |
1107 | if Compile_Time_Known_Value (Lo) then | |
1108 | Lov := Expr_Value (Lo); | |
1109 | else | |
1110 | return False; | |
1111 | end if; | |
1112 | ||
1113 | if Compile_Time_Known_Value (Hi) then | |
1114 | Hiv := Expr_Value (Hi); | |
1115 | else | |
1116 | return False; | |
1117 | end if; | |
1118 | ||
1119 | return Hiv < Lov + 3; | |
1120 | end; | |
1121 | end if; | |
1122 | end Length_Less_Than_4; | |
1123 | ||
1124 | -- Start of processing for Expand_Array_Comparison | |
1125 | ||
70482933 | 1126 | begin |
fbf5a39b AC |
1127 | -- Deal first with unpacked case, where we can call a runtime routine |
1128 | -- except that we avoid this for targets for which are not addressable | |
26bff3d9 | 1129 | -- by bytes, and for the JVM/CIL, since they do not support direct |
fbf5a39b AC |
1130 | -- addressing of array components. |
1131 | ||
1132 | if not Is_Bit_Packed_Array (Typ1) | |
9bc43c53 | 1133 | and then Byte_Addressable |
26bff3d9 | 1134 | and then VM_Target = No_VM |
fbf5a39b AC |
1135 | then |
1136 | -- The call we generate is: | |
1137 | ||
1138 | -- Compare_Array_xn[_Unaligned] | |
1139 | -- (left'address, right'address, left'length, right'length) <op> 0 | |
1140 | ||
1141 | -- x = U for unsigned, S for signed | |
1142 | -- n = 8,16,32,64 for component size | |
1143 | -- Add _Unaligned if length < 4 and component size is 8. | |
1144 | -- <op> is the standard comparison operator | |
1145 | ||
1146 | if Component_Size (Typ1) = 8 then | |
1147 | if Length_Less_Than_4 (Op1) | |
1148 | or else | |
1149 | Length_Less_Than_4 (Op2) | |
1150 | then | |
1151 | if Is_Unsigned_Type (Ctyp) then | |
1152 | Comp := RE_Compare_Array_U8_Unaligned; | |
1153 | else | |
1154 | Comp := RE_Compare_Array_S8_Unaligned; | |
1155 | end if; | |
1156 | ||
1157 | else | |
1158 | if Is_Unsigned_Type (Ctyp) then | |
1159 | Comp := RE_Compare_Array_U8; | |
1160 | else | |
1161 | Comp := RE_Compare_Array_S8; | |
1162 | end if; | |
1163 | end if; | |
1164 | ||
1165 | elsif Component_Size (Typ1) = 16 then | |
1166 | if Is_Unsigned_Type (Ctyp) then | |
1167 | Comp := RE_Compare_Array_U16; | |
1168 | else | |
1169 | Comp := RE_Compare_Array_S16; | |
1170 | end if; | |
1171 | ||
1172 | elsif Component_Size (Typ1) = 32 then | |
1173 | if Is_Unsigned_Type (Ctyp) then | |
1174 | Comp := RE_Compare_Array_U32; | |
1175 | else | |
1176 | Comp := RE_Compare_Array_S32; | |
1177 | end if; | |
1178 | ||
1179 | else pragma Assert (Component_Size (Typ1) = 64); | |
1180 | if Is_Unsigned_Type (Ctyp) then | |
1181 | Comp := RE_Compare_Array_U64; | |
1182 | else | |
1183 | Comp := RE_Compare_Array_S64; | |
1184 | end if; | |
1185 | end if; | |
1186 | ||
1187 | Remove_Side_Effects (Op1, Name_Req => True); | |
1188 | Remove_Side_Effects (Op2, Name_Req => True); | |
1189 | ||
1190 | Rewrite (Op1, | |
1191 | Make_Function_Call (Sloc (Op1), | |
1192 | Name => New_Occurrence_Of (RTE (Comp), Loc), | |
1193 | ||
1194 | Parameter_Associations => New_List ( | |
1195 | Make_Attribute_Reference (Loc, | |
1196 | Prefix => Relocate_Node (Op1), | |
1197 | Attribute_Name => Name_Address), | |
1198 | ||
1199 | Make_Attribute_Reference (Loc, | |
1200 | Prefix => Relocate_Node (Op2), | |
1201 | Attribute_Name => Name_Address), | |
1202 | ||
1203 | Make_Attribute_Reference (Loc, | |
1204 | Prefix => Relocate_Node (Op1), | |
1205 | Attribute_Name => Name_Length), | |
1206 | ||
1207 | Make_Attribute_Reference (Loc, | |
1208 | Prefix => Relocate_Node (Op2), | |
1209 | Attribute_Name => Name_Length)))); | |
1210 | ||
1211 | Rewrite (Op2, | |
1212 | Make_Integer_Literal (Sloc (Op2), | |
1213 | Intval => Uint_0)); | |
1214 | ||
1215 | Analyze_And_Resolve (Op1, Standard_Integer); | |
1216 | Analyze_And_Resolve (Op2, Standard_Integer); | |
1217 | return; | |
1218 | end if; | |
1219 | ||
1220 | -- Cases where we cannot make runtime call | |
1221 | ||
70482933 RK |
1222 | -- For (a <= b) we convert to not (a > b) |
1223 | ||
1224 | if Chars (N) = Name_Op_Le then | |
1225 | Rewrite (N, | |
1226 | Make_Op_Not (Loc, | |
1227 | Right_Opnd => | |
1228 | Make_Op_Gt (Loc, | |
1229 | Left_Opnd => Op1, | |
1230 | Right_Opnd => Op2))); | |
1231 | Analyze_And_Resolve (N, Standard_Boolean); | |
1232 | return; | |
1233 | ||
1234 | -- For < the Boolean expression is | |
1235 | -- greater__nn (op2, op1) | |
1236 | ||
1237 | elsif Chars (N) = Name_Op_Lt then | |
1238 | Func_Body := Make_Array_Comparison_Op (Typ1, N); | |
1239 | ||
1240 | -- Switch operands | |
1241 | ||
1242 | Op1 := Right_Opnd (N); | |
1243 | Op2 := Left_Opnd (N); | |
1244 | ||
1245 | -- For (a >= b) we convert to not (a < b) | |
1246 | ||
1247 | elsif Chars (N) = Name_Op_Ge then | |
1248 | Rewrite (N, | |
1249 | Make_Op_Not (Loc, | |
1250 | Right_Opnd => | |
1251 | Make_Op_Lt (Loc, | |
1252 | Left_Opnd => Op1, | |
1253 | Right_Opnd => Op2))); | |
1254 | Analyze_And_Resolve (N, Standard_Boolean); | |
1255 | return; | |
1256 | ||
1257 | -- For > the Boolean expression is | |
1258 | -- greater__nn (op1, op2) | |
1259 | ||
1260 | else | |
1261 | pragma Assert (Chars (N) = Name_Op_Gt); | |
1262 | Func_Body := Make_Array_Comparison_Op (Typ1, N); | |
1263 | end if; | |
1264 | ||
1265 | Func_Name := Defining_Unit_Name (Specification (Func_Body)); | |
1266 | Expr := | |
1267 | Make_Function_Call (Loc, | |
1268 | Name => New_Reference_To (Func_Name, Loc), | |
1269 | Parameter_Associations => New_List (Op1, Op2)); | |
1270 | ||
1271 | Insert_Action (N, Func_Body); | |
1272 | Rewrite (N, Expr); | |
1273 | Analyze_And_Resolve (N, Standard_Boolean); | |
1274 | ||
fbf5a39b AC |
1275 | exception |
1276 | when RE_Not_Available => | |
1277 | return; | |
70482933 RK |
1278 | end Expand_Array_Comparison; |
1279 | ||
1280 | --------------------------- | |
1281 | -- Expand_Array_Equality -- | |
1282 | --------------------------- | |
1283 | ||
685094bf RD |
1284 | -- Expand an equality function for multi-dimensional arrays. Here is an |
1285 | -- example of such a function for Nb_Dimension = 2 | |
70482933 | 1286 | |
0da2c8ac | 1287 | -- function Enn (A : atyp; B : btyp) return boolean is |
70482933 | 1288 | -- begin |
fbf5a39b AC |
1289 | -- if (A'length (1) = 0 or else A'length (2) = 0) |
1290 | -- and then | |
1291 | -- (B'length (1) = 0 or else B'length (2) = 0) | |
1292 | -- then | |
1293 | -- return True; -- RM 4.5.2(22) | |
1294 | -- end if; | |
0da2c8ac | 1295 | |
fbf5a39b AC |
1296 | -- if A'length (1) /= B'length (1) |
1297 | -- or else | |
1298 | -- A'length (2) /= B'length (2) | |
1299 | -- then | |
1300 | -- return False; -- RM 4.5.2(23) | |
1301 | -- end if; | |
0da2c8ac | 1302 | |
fbf5a39b | 1303 | -- declare |
523456db AC |
1304 | -- A1 : Index_T1 := A'first (1); |
1305 | -- B1 : Index_T1 := B'first (1); | |
fbf5a39b | 1306 | -- begin |
523456db | 1307 | -- loop |
fbf5a39b | 1308 | -- declare |
523456db AC |
1309 | -- A2 : Index_T2 := A'first (2); |
1310 | -- B2 : Index_T2 := B'first (2); | |
fbf5a39b | 1311 | -- begin |
523456db | 1312 | -- loop |
fbf5a39b AC |
1313 | -- if A (A1, A2) /= B (B1, B2) then |
1314 | -- return False; | |
70482933 | 1315 | -- end if; |
0da2c8ac | 1316 | |
523456db AC |
1317 | -- exit when A2 = A'last (2); |
1318 | -- A2 := Index_T2'succ (A2); | |
0da2c8ac | 1319 | -- B2 := Index_T2'succ (B2); |
70482933 | 1320 | -- end loop; |
fbf5a39b | 1321 | -- end; |
0da2c8ac | 1322 | |
523456db AC |
1323 | -- exit when A1 = A'last (1); |
1324 | -- A1 := Index_T1'succ (A1); | |
0da2c8ac | 1325 | -- B1 := Index_T1'succ (B1); |
70482933 | 1326 | -- end loop; |
fbf5a39b | 1327 | -- end; |
0da2c8ac | 1328 | |
70482933 RK |
1329 | -- return true; |
1330 | -- end Enn; | |
1331 | ||
685094bf RD |
1332 | -- Note on the formal types used (atyp and btyp). If either of the arrays |
1333 | -- is of a private type, we use the underlying type, and do an unchecked | |
1334 | -- conversion of the actual. If either of the arrays has a bound depending | |
1335 | -- on a discriminant, then we use the base type since otherwise we have an | |
1336 | -- escaped discriminant in the function. | |
0da2c8ac | 1337 | |
685094bf RD |
1338 | -- If both arrays are constrained and have the same bounds, we can generate |
1339 | -- a loop with an explicit iteration scheme using a 'Range attribute over | |
1340 | -- the first array. | |
523456db | 1341 | |
70482933 RK |
1342 | function Expand_Array_Equality |
1343 | (Nod : Node_Id; | |
70482933 RK |
1344 | Lhs : Node_Id; |
1345 | Rhs : Node_Id; | |
0da2c8ac AC |
1346 | Bodies : List_Id; |
1347 | Typ : Entity_Id) return Node_Id | |
70482933 RK |
1348 | is |
1349 | Loc : constant Source_Ptr := Sloc (Nod); | |
fbf5a39b AC |
1350 | Decls : constant List_Id := New_List; |
1351 | Index_List1 : constant List_Id := New_List; | |
1352 | Index_List2 : constant List_Id := New_List; | |
1353 | ||
1354 | Actuals : List_Id; | |
1355 | Formals : List_Id; | |
1356 | Func_Name : Entity_Id; | |
1357 | Func_Body : Node_Id; | |
70482933 RK |
1358 | |
1359 | A : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uA); | |
1360 | B : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uB); | |
1361 | ||
0da2c8ac AC |
1362 | Ltyp : Entity_Id; |
1363 | Rtyp : Entity_Id; | |
1364 | -- The parameter types to be used for the formals | |
1365 | ||
fbf5a39b AC |
1366 | function Arr_Attr |
1367 | (Arr : Entity_Id; | |
1368 | Nam : Name_Id; | |
2e071734 | 1369 | Num : Int) return Node_Id; |
5e1c00fa | 1370 | -- This builds the attribute reference Arr'Nam (Expr) |
fbf5a39b | 1371 | |
70482933 | 1372 | function Component_Equality (Typ : Entity_Id) return Node_Id; |
685094bf RD |
1373 | -- Create one statement to compare corresponding components, designated |
1374 | -- by a full set of indices. | |
70482933 | 1375 | |
0da2c8ac | 1376 | function Get_Arg_Type (N : Node_Id) return Entity_Id; |
685094bf RD |
1377 | -- Given one of the arguments, computes the appropriate type to be used |
1378 | -- for that argument in the corresponding function formal | |
0da2c8ac | 1379 | |
fbf5a39b | 1380 | function Handle_One_Dimension |
70482933 | 1381 | (N : Int; |
2e071734 | 1382 | Index : Node_Id) return Node_Id; |
0da2c8ac | 1383 | -- This procedure returns the following code |
fbf5a39b AC |
1384 | -- |
1385 | -- declare | |
523456db | 1386 | -- Bn : Index_T := B'First (N); |
fbf5a39b | 1387 | -- begin |
523456db | 1388 | -- loop |
fbf5a39b | 1389 | -- xxx |
523456db AC |
1390 | -- exit when An = A'Last (N); |
1391 | -- An := Index_T'Succ (An) | |
0da2c8ac | 1392 | -- Bn := Index_T'Succ (Bn) |
fbf5a39b AC |
1393 | -- end loop; |
1394 | -- end; | |
1395 | -- | |
523456db AC |
1396 | -- If both indices are constrained and identical, the procedure |
1397 | -- returns a simpler loop: | |
1398 | -- | |
1399 | -- for An in A'Range (N) loop | |
1400 | -- xxx | |
1401 | -- end loop | |
0da2c8ac | 1402 | -- |
523456db | 1403 | -- N is the dimension for which we are generating a loop. Index is the |
685094bf RD |
1404 | -- N'th index node, whose Etype is Index_Type_n in the above code. The |
1405 | -- xxx statement is either the loop or declare for the next dimension | |
1406 | -- or if this is the last dimension the comparison of corresponding | |
1407 | -- components of the arrays. | |
fbf5a39b | 1408 | -- |
685094bf RD |
1409 | -- The actual way the code works is to return the comparison of |
1410 | -- corresponding components for the N+1 call. That's neater! | |
fbf5a39b AC |
1411 | |
1412 | function Test_Empty_Arrays return Node_Id; | |
1413 | -- This function constructs the test for both arrays being empty | |
1414 | -- (A'length (1) = 0 or else A'length (2) = 0 or else ...) | |
1415 | -- and then | |
1416 | -- (B'length (1) = 0 or else B'length (2) = 0 or else ...) | |
1417 | ||
1418 | function Test_Lengths_Correspond return Node_Id; | |
685094bf RD |
1419 | -- This function constructs the test for arrays having different lengths |
1420 | -- in at least one index position, in which case the resulting code is: | |
fbf5a39b AC |
1421 | |
1422 | -- A'length (1) /= B'length (1) | |
1423 | -- or else | |
1424 | -- A'length (2) /= B'length (2) | |
1425 | -- or else | |
1426 | -- ... | |
1427 | ||
1428 | -------------- | |
1429 | -- Arr_Attr -- | |
1430 | -------------- | |
1431 | ||
1432 | function Arr_Attr | |
1433 | (Arr : Entity_Id; | |
1434 | Nam : Name_Id; | |
2e071734 | 1435 | Num : Int) return Node_Id |
fbf5a39b AC |
1436 | is |
1437 | begin | |
1438 | return | |
1439 | Make_Attribute_Reference (Loc, | |
1440 | Attribute_Name => Nam, | |
1441 | Prefix => New_Reference_To (Arr, Loc), | |
1442 | Expressions => New_List (Make_Integer_Literal (Loc, Num))); | |
1443 | end Arr_Attr; | |
70482933 RK |
1444 | |
1445 | ------------------------ | |
1446 | -- Component_Equality -- | |
1447 | ------------------------ | |
1448 | ||
1449 | function Component_Equality (Typ : Entity_Id) return Node_Id is | |
1450 | Test : Node_Id; | |
1451 | L, R : Node_Id; | |
1452 | ||
1453 | begin | |
1454 | -- if a(i1...) /= b(j1...) then return false; end if; | |
1455 | ||
1456 | L := | |
1457 | Make_Indexed_Component (Loc, | |
1458 | Prefix => Make_Identifier (Loc, Chars (A)), | |
1459 | Expressions => Index_List1); | |
1460 | ||
1461 | R := | |
1462 | Make_Indexed_Component (Loc, | |
1463 | Prefix => Make_Identifier (Loc, Chars (B)), | |
1464 | Expressions => Index_List2); | |
1465 | ||
1466 | Test := Expand_Composite_Equality | |
1467 | (Nod, Component_Type (Typ), L, R, Decls); | |
1468 | ||
a9d8907c JM |
1469 | -- If some (sub)component is an unchecked_union, the whole operation |
1470 | -- will raise program error. | |
8aceda64 AC |
1471 | |
1472 | if Nkind (Test) = N_Raise_Program_Error then | |
a9d8907c JM |
1473 | |
1474 | -- This node is going to be inserted at a location where a | |
685094bf RD |
1475 | -- statement is expected: clear its Etype so analysis will set |
1476 | -- it to the expected Standard_Void_Type. | |
a9d8907c JM |
1477 | |
1478 | Set_Etype (Test, Empty); | |
8aceda64 AC |
1479 | return Test; |
1480 | ||
1481 | else | |
1482 | return | |
1483 | Make_Implicit_If_Statement (Nod, | |
1484 | Condition => Make_Op_Not (Loc, Right_Opnd => Test), | |
1485 | Then_Statements => New_List ( | |
d766cee3 | 1486 | Make_Simple_Return_Statement (Loc, |
8aceda64 AC |
1487 | Expression => New_Occurrence_Of (Standard_False, Loc)))); |
1488 | end if; | |
70482933 RK |
1489 | end Component_Equality; |
1490 | ||
0da2c8ac AC |
1491 | ------------------ |
1492 | -- Get_Arg_Type -- | |
1493 | ------------------ | |
1494 | ||
1495 | function Get_Arg_Type (N : Node_Id) return Entity_Id is | |
1496 | T : Entity_Id; | |
1497 | X : Node_Id; | |
1498 | ||
1499 | begin | |
1500 | T := Etype (N); | |
1501 | ||
1502 | if No (T) then | |
1503 | return Typ; | |
1504 | ||
1505 | else | |
1506 | T := Underlying_Type (T); | |
1507 | ||
1508 | X := First_Index (T); | |
1509 | while Present (X) loop | |
1510 | if Denotes_Discriminant (Type_Low_Bound (Etype (X))) | |
1511 | or else | |
1512 | Denotes_Discriminant (Type_High_Bound (Etype (X))) | |
1513 | then | |
1514 | T := Base_Type (T); | |
1515 | exit; | |
1516 | end if; | |
1517 | ||
1518 | Next_Index (X); | |
1519 | end loop; | |
1520 | ||
1521 | return T; | |
1522 | end if; | |
1523 | end Get_Arg_Type; | |
1524 | ||
fbf5a39b AC |
1525 | -------------------------- |
1526 | -- Handle_One_Dimension -- | |
1527 | --------------------------- | |
70482933 | 1528 | |
fbf5a39b | 1529 | function Handle_One_Dimension |
70482933 | 1530 | (N : Int; |
2e071734 | 1531 | Index : Node_Id) return Node_Id |
70482933 | 1532 | is |
0da2c8ac AC |
1533 | Need_Separate_Indexes : constant Boolean := |
1534 | Ltyp /= Rtyp | |
1535 | or else not Is_Constrained (Ltyp); | |
1536 | -- If the index types are identical, and we are working with | |
685094bf RD |
1537 | -- constrained types, then we can use the same index for both |
1538 | -- of the arrays. | |
0da2c8ac | 1539 | |
fbf5a39b AC |
1540 | An : constant Entity_Id := Make_Defining_Identifier (Loc, |
1541 | Chars => New_Internal_Name ('A')); | |
0da2c8ac AC |
1542 | |
1543 | Bn : Entity_Id; | |
1544 | Index_T : Entity_Id; | |
1545 | Stm_List : List_Id; | |
1546 | Loop_Stm : Node_Id; | |
70482933 RK |
1547 | |
1548 | begin | |
0da2c8ac AC |
1549 | if N > Number_Dimensions (Ltyp) then |
1550 | return Component_Equality (Ltyp); | |
fbf5a39b | 1551 | end if; |
70482933 | 1552 | |
0da2c8ac AC |
1553 | -- Case where we generate a loop |
1554 | ||
1555 | Index_T := Base_Type (Etype (Index)); | |
1556 | ||
1557 | if Need_Separate_Indexes then | |
1558 | Bn := | |
1559 | Make_Defining_Identifier (Loc, | |
1560 | Chars => New_Internal_Name ('B')); | |
1561 | else | |
1562 | Bn := An; | |
1563 | end if; | |
70482933 | 1564 | |
fbf5a39b AC |
1565 | Append (New_Reference_To (An, Loc), Index_List1); |
1566 | Append (New_Reference_To (Bn, Loc), Index_List2); | |
70482933 | 1567 | |
0da2c8ac AC |
1568 | Stm_List := New_List ( |
1569 | Handle_One_Dimension (N + 1, Next_Index (Index))); | |
70482933 | 1570 | |
0da2c8ac | 1571 | if Need_Separate_Indexes then |
a9d8907c | 1572 | |
5e1c00fa | 1573 | -- Generate guard for loop, followed by increments of indices |
523456db AC |
1574 | |
1575 | Append_To (Stm_List, | |
1576 | Make_Exit_Statement (Loc, | |
1577 | Condition => | |
1578 | Make_Op_Eq (Loc, | |
1579 | Left_Opnd => New_Reference_To (An, Loc), | |
1580 | Right_Opnd => Arr_Attr (A, Name_Last, N)))); | |
1581 | ||
1582 | Append_To (Stm_List, | |
1583 | Make_Assignment_Statement (Loc, | |
1584 | Name => New_Reference_To (An, Loc), | |
1585 | Expression => | |
1586 | Make_Attribute_Reference (Loc, | |
1587 | Prefix => New_Reference_To (Index_T, Loc), | |
1588 | Attribute_Name => Name_Succ, | |
1589 | Expressions => New_List (New_Reference_To (An, Loc))))); | |
1590 | ||
0da2c8ac AC |
1591 | Append_To (Stm_List, |
1592 | Make_Assignment_Statement (Loc, | |
1593 | Name => New_Reference_To (Bn, Loc), | |
1594 | Expression => | |
1595 | Make_Attribute_Reference (Loc, | |
1596 | Prefix => New_Reference_To (Index_T, Loc), | |
1597 | Attribute_Name => Name_Succ, | |
1598 | Expressions => New_List (New_Reference_To (Bn, Loc))))); | |
1599 | end if; | |
1600 | ||
a9d8907c JM |
1601 | -- If separate indexes, we need a declare block for An and Bn, and a |
1602 | -- loop without an iteration scheme. | |
0da2c8ac AC |
1603 | |
1604 | if Need_Separate_Indexes then | |
523456db AC |
1605 | Loop_Stm := |
1606 | Make_Implicit_Loop_Statement (Nod, Statements => Stm_List); | |
1607 | ||
0da2c8ac AC |
1608 | return |
1609 | Make_Block_Statement (Loc, | |
1610 | Declarations => New_List ( | |
523456db AC |
1611 | Make_Object_Declaration (Loc, |
1612 | Defining_Identifier => An, | |
1613 | Object_Definition => New_Reference_To (Index_T, Loc), | |
1614 | Expression => Arr_Attr (A, Name_First, N)), | |
1615 | ||
0da2c8ac AC |
1616 | Make_Object_Declaration (Loc, |
1617 | Defining_Identifier => Bn, | |
1618 | Object_Definition => New_Reference_To (Index_T, Loc), | |
1619 | Expression => Arr_Attr (B, Name_First, N))), | |
523456db | 1620 | |
0da2c8ac AC |
1621 | Handled_Statement_Sequence => |
1622 | Make_Handled_Sequence_Of_Statements (Loc, | |
1623 | Statements => New_List (Loop_Stm))); | |
1624 | ||
523456db AC |
1625 | -- If no separate indexes, return loop statement with explicit |
1626 | -- iteration scheme on its own | |
0da2c8ac AC |
1627 | |
1628 | else | |
523456db AC |
1629 | Loop_Stm := |
1630 | Make_Implicit_Loop_Statement (Nod, | |
1631 | Statements => Stm_List, | |
1632 | Iteration_Scheme => | |
1633 | Make_Iteration_Scheme (Loc, | |
1634 | Loop_Parameter_Specification => | |
1635 | Make_Loop_Parameter_Specification (Loc, | |
1636 | Defining_Identifier => An, | |
1637 | Discrete_Subtype_Definition => | |
1638 | Arr_Attr (A, Name_Range, N)))); | |
0da2c8ac AC |
1639 | return Loop_Stm; |
1640 | end if; | |
fbf5a39b AC |
1641 | end Handle_One_Dimension; |
1642 | ||
1643 | ----------------------- | |
1644 | -- Test_Empty_Arrays -- | |
1645 | ----------------------- | |
1646 | ||
1647 | function Test_Empty_Arrays return Node_Id is | |
1648 | Alist : Node_Id; | |
1649 | Blist : Node_Id; | |
1650 | ||
1651 | Atest : Node_Id; | |
1652 | Btest : Node_Id; | |
70482933 | 1653 | |
fbf5a39b AC |
1654 | begin |
1655 | Alist := Empty; | |
1656 | Blist := Empty; | |
0da2c8ac | 1657 | for J in 1 .. Number_Dimensions (Ltyp) loop |
fbf5a39b AC |
1658 | Atest := |
1659 | Make_Op_Eq (Loc, | |
1660 | Left_Opnd => Arr_Attr (A, Name_Length, J), | |
1661 | Right_Opnd => Make_Integer_Literal (Loc, 0)); | |
1662 | ||
1663 | Btest := | |
1664 | Make_Op_Eq (Loc, | |
1665 | Left_Opnd => Arr_Attr (B, Name_Length, J), | |
1666 | Right_Opnd => Make_Integer_Literal (Loc, 0)); | |
1667 | ||
1668 | if No (Alist) then | |
1669 | Alist := Atest; | |
1670 | Blist := Btest; | |
70482933 | 1671 | |
fbf5a39b AC |
1672 | else |
1673 | Alist := | |
1674 | Make_Or_Else (Loc, | |
1675 | Left_Opnd => Relocate_Node (Alist), | |
1676 | Right_Opnd => Atest); | |
1677 | ||
1678 | Blist := | |
1679 | Make_Or_Else (Loc, | |
1680 | Left_Opnd => Relocate_Node (Blist), | |
1681 | Right_Opnd => Btest); | |
1682 | end if; | |
1683 | end loop; | |
70482933 | 1684 | |
fbf5a39b AC |
1685 | return |
1686 | Make_And_Then (Loc, | |
1687 | Left_Opnd => Alist, | |
1688 | Right_Opnd => Blist); | |
1689 | end Test_Empty_Arrays; | |
70482933 | 1690 | |
fbf5a39b AC |
1691 | ----------------------------- |
1692 | -- Test_Lengths_Correspond -- | |
1693 | ----------------------------- | |
70482933 | 1694 | |
fbf5a39b AC |
1695 | function Test_Lengths_Correspond return Node_Id is |
1696 | Result : Node_Id; | |
1697 | Rtest : Node_Id; | |
1698 | ||
1699 | begin | |
1700 | Result := Empty; | |
0da2c8ac | 1701 | for J in 1 .. Number_Dimensions (Ltyp) loop |
fbf5a39b AC |
1702 | Rtest := |
1703 | Make_Op_Ne (Loc, | |
1704 | Left_Opnd => Arr_Attr (A, Name_Length, J), | |
1705 | Right_Opnd => Arr_Attr (B, Name_Length, J)); | |
1706 | ||
1707 | if No (Result) then | |
1708 | Result := Rtest; | |
1709 | else | |
1710 | Result := | |
1711 | Make_Or_Else (Loc, | |
1712 | Left_Opnd => Relocate_Node (Result), | |
1713 | Right_Opnd => Rtest); | |
1714 | end if; | |
1715 | end loop; | |
1716 | ||
1717 | return Result; | |
1718 | end Test_Lengths_Correspond; | |
70482933 RK |
1719 | |
1720 | -- Start of processing for Expand_Array_Equality | |
1721 | ||
1722 | begin | |
0da2c8ac AC |
1723 | Ltyp := Get_Arg_Type (Lhs); |
1724 | Rtyp := Get_Arg_Type (Rhs); | |
1725 | ||
685094bf RD |
1726 | -- For now, if the argument types are not the same, go to the base type, |
1727 | -- since the code assumes that the formals have the same type. This is | |
1728 | -- fixable in future ??? | |
0da2c8ac AC |
1729 | |
1730 | if Ltyp /= Rtyp then | |
1731 | Ltyp := Base_Type (Ltyp); | |
1732 | Rtyp := Base_Type (Rtyp); | |
1733 | pragma Assert (Ltyp = Rtyp); | |
1734 | end if; | |
1735 | ||
1736 | -- Build list of formals for function | |
1737 | ||
70482933 RK |
1738 | Formals := New_List ( |
1739 | Make_Parameter_Specification (Loc, | |
1740 | Defining_Identifier => A, | |
0da2c8ac | 1741 | Parameter_Type => New_Reference_To (Ltyp, Loc)), |
70482933 RK |
1742 | |
1743 | Make_Parameter_Specification (Loc, | |
1744 | Defining_Identifier => B, | |
0da2c8ac | 1745 | Parameter_Type => New_Reference_To (Rtyp, Loc))); |
70482933 RK |
1746 | |
1747 | Func_Name := Make_Defining_Identifier (Loc, New_Internal_Name ('E')); | |
1748 | ||
fbf5a39b | 1749 | -- Build statement sequence for function |
70482933 RK |
1750 | |
1751 | Func_Body := | |
1752 | Make_Subprogram_Body (Loc, | |
1753 | Specification => | |
1754 | Make_Function_Specification (Loc, | |
1755 | Defining_Unit_Name => Func_Name, | |
1756 | Parameter_Specifications => Formals, | |
630d30e9 | 1757 | Result_Definition => New_Reference_To (Standard_Boolean, Loc)), |
fbf5a39b AC |
1758 | |
1759 | Declarations => Decls, | |
1760 | ||
70482933 RK |
1761 | Handled_Statement_Sequence => |
1762 | Make_Handled_Sequence_Of_Statements (Loc, | |
1763 | Statements => New_List ( | |
fbf5a39b AC |
1764 | |
1765 | Make_Implicit_If_Statement (Nod, | |
1766 | Condition => Test_Empty_Arrays, | |
1767 | Then_Statements => New_List ( | |
d766cee3 | 1768 | Make_Simple_Return_Statement (Loc, |
fbf5a39b AC |
1769 | Expression => |
1770 | New_Occurrence_Of (Standard_True, Loc)))), | |
1771 | ||
1772 | Make_Implicit_If_Statement (Nod, | |
1773 | Condition => Test_Lengths_Correspond, | |
1774 | Then_Statements => New_List ( | |
d766cee3 | 1775 | Make_Simple_Return_Statement (Loc, |
fbf5a39b AC |
1776 | Expression => |
1777 | New_Occurrence_Of (Standard_False, Loc)))), | |
1778 | ||
0da2c8ac | 1779 | Handle_One_Dimension (1, First_Index (Ltyp)), |
fbf5a39b | 1780 | |
d766cee3 | 1781 | Make_Simple_Return_Statement (Loc, |
70482933 RK |
1782 | Expression => New_Occurrence_Of (Standard_True, Loc))))); |
1783 | ||
1784 | Set_Has_Completion (Func_Name, True); | |
0da2c8ac | 1785 | Set_Is_Inlined (Func_Name); |
70482933 | 1786 | |
685094bf RD |
1787 | -- If the array type is distinct from the type of the arguments, it |
1788 | -- is the full view of a private type. Apply an unchecked conversion | |
1789 | -- to insure that analysis of the call succeeds. | |
70482933 | 1790 | |
0da2c8ac AC |
1791 | declare |
1792 | L, R : Node_Id; | |
1793 | ||
1794 | begin | |
1795 | L := Lhs; | |
1796 | R := Rhs; | |
1797 | ||
1798 | if No (Etype (Lhs)) | |
1799 | or else Base_Type (Etype (Lhs)) /= Base_Type (Ltyp) | |
1800 | then | |
1801 | L := OK_Convert_To (Ltyp, Lhs); | |
1802 | end if; | |
1803 | ||
1804 | if No (Etype (Rhs)) | |
1805 | or else Base_Type (Etype (Rhs)) /= Base_Type (Rtyp) | |
1806 | then | |
1807 | R := OK_Convert_To (Rtyp, Rhs); | |
1808 | end if; | |
1809 | ||
1810 | Actuals := New_List (L, R); | |
1811 | end; | |
70482933 RK |
1812 | |
1813 | Append_To (Bodies, Func_Body); | |
1814 | ||
1815 | return | |
1816 | Make_Function_Call (Loc, | |
0da2c8ac | 1817 | Name => New_Reference_To (Func_Name, Loc), |
70482933 RK |
1818 | Parameter_Associations => Actuals); |
1819 | end Expand_Array_Equality; | |
1820 | ||
1821 | ----------------------------- | |
1822 | -- Expand_Boolean_Operator -- | |
1823 | ----------------------------- | |
1824 | ||
685094bf RD |
1825 | -- Note that we first get the actual subtypes of the operands, since we |
1826 | -- always want to deal with types that have bounds. | |
70482933 RK |
1827 | |
1828 | procedure Expand_Boolean_Operator (N : Node_Id) is | |
fbf5a39b | 1829 | Typ : constant Entity_Id := Etype (N); |
70482933 RK |
1830 | |
1831 | begin | |
685094bf RD |
1832 | -- Special case of bit packed array where both operands are known to be |
1833 | -- properly aligned. In this case we use an efficient run time routine | |
1834 | -- to carry out the operation (see System.Bit_Ops). | |
a9d8907c JM |
1835 | |
1836 | if Is_Bit_Packed_Array (Typ) | |
1837 | and then not Is_Possibly_Unaligned_Object (Left_Opnd (N)) | |
1838 | and then not Is_Possibly_Unaligned_Object (Right_Opnd (N)) | |
1839 | then | |
70482933 | 1840 | Expand_Packed_Boolean_Operator (N); |
a9d8907c JM |
1841 | return; |
1842 | end if; | |
70482933 | 1843 | |
a9d8907c JM |
1844 | -- For the normal non-packed case, the general expansion is to build |
1845 | -- function for carrying out the comparison (use Make_Boolean_Array_Op) | |
1846 | -- and then inserting it into the tree. The original operator node is | |
1847 | -- then rewritten as a call to this function. We also use this in the | |
1848 | -- packed case if either operand is a possibly unaligned object. | |
70482933 | 1849 | |
a9d8907c JM |
1850 | declare |
1851 | Loc : constant Source_Ptr := Sloc (N); | |
1852 | L : constant Node_Id := Relocate_Node (Left_Opnd (N)); | |
1853 | R : constant Node_Id := Relocate_Node (Right_Opnd (N)); | |
1854 | Func_Body : Node_Id; | |
1855 | Func_Name : Entity_Id; | |
fbf5a39b | 1856 | |
a9d8907c JM |
1857 | begin |
1858 | Convert_To_Actual_Subtype (L); | |
1859 | Convert_To_Actual_Subtype (R); | |
1860 | Ensure_Defined (Etype (L), N); | |
1861 | Ensure_Defined (Etype (R), N); | |
1862 | Apply_Length_Check (R, Etype (L)); | |
1863 | ||
b4592168 GD |
1864 | if Nkind (N) = N_Op_Xor then |
1865 | Silly_Boolean_Array_Xor_Test (N, Etype (L)); | |
1866 | end if; | |
1867 | ||
a9d8907c JM |
1868 | if Nkind (Parent (N)) = N_Assignment_Statement |
1869 | and then Safe_In_Place_Array_Op (Name (Parent (N)), L, R) | |
1870 | then | |
1871 | Build_Boolean_Array_Proc_Call (Parent (N), L, R); | |
fbf5a39b | 1872 | |
a9d8907c JM |
1873 | elsif Nkind (Parent (N)) = N_Op_Not |
1874 | and then Nkind (N) = N_Op_And | |
1875 | and then | |
b4592168 | 1876 | Safe_In_Place_Array_Op (Name (Parent (Parent (N))), L, R) |
a9d8907c JM |
1877 | then |
1878 | return; | |
1879 | else | |
fbf5a39b | 1880 | |
a9d8907c JM |
1881 | Func_Body := Make_Boolean_Array_Op (Etype (L), N); |
1882 | Func_Name := Defining_Unit_Name (Specification (Func_Body)); | |
1883 | Insert_Action (N, Func_Body); | |
70482933 | 1884 | |
a9d8907c | 1885 | -- Now rewrite the expression with a call |
70482933 | 1886 | |
a9d8907c JM |
1887 | Rewrite (N, |
1888 | Make_Function_Call (Loc, | |
1889 | Name => New_Reference_To (Func_Name, Loc), | |
1890 | Parameter_Associations => | |
1891 | New_List ( | |
1892 | L, | |
1893 | Make_Type_Conversion | |
1894 | (Loc, New_Reference_To (Etype (L), Loc), R)))); | |
70482933 | 1895 | |
a9d8907c JM |
1896 | Analyze_And_Resolve (N, Typ); |
1897 | end if; | |
1898 | end; | |
70482933 RK |
1899 | end Expand_Boolean_Operator; |
1900 | ||
1901 | ------------------------------- | |
1902 | -- Expand_Composite_Equality -- | |
1903 | ------------------------------- | |
1904 | ||
1905 | -- This function is only called for comparing internal fields of composite | |
1906 | -- types when these fields are themselves composites. This is a special | |
1907 | -- case because it is not possible to respect normal Ada visibility rules. | |
1908 | ||
1909 | function Expand_Composite_Equality | |
1910 | (Nod : Node_Id; | |
1911 | Typ : Entity_Id; | |
1912 | Lhs : Node_Id; | |
1913 | Rhs : Node_Id; | |
2e071734 | 1914 | Bodies : List_Id) return Node_Id |
70482933 RK |
1915 | is |
1916 | Loc : constant Source_Ptr := Sloc (Nod); | |
1917 | Full_Type : Entity_Id; | |
1918 | Prim : Elmt_Id; | |
1919 | Eq_Op : Entity_Id; | |
1920 | ||
1921 | begin | |
1922 | if Is_Private_Type (Typ) then | |
1923 | Full_Type := Underlying_Type (Typ); | |
1924 | else | |
1925 | Full_Type := Typ; | |
1926 | end if; | |
1927 | ||
685094bf RD |
1928 | -- Defense against malformed private types with no completion the error |
1929 | -- will be diagnosed later by check_completion | |
70482933 RK |
1930 | |
1931 | if No (Full_Type) then | |
1932 | return New_Reference_To (Standard_False, Loc); | |
1933 | end if; | |
1934 | ||
1935 | Full_Type := Base_Type (Full_Type); | |
1936 | ||
1937 | if Is_Array_Type (Full_Type) then | |
1938 | ||
1939 | -- If the operand is an elementary type other than a floating-point | |
1940 | -- type, then we can simply use the built-in block bitwise equality, | |
1941 | -- since the predefined equality operators always apply and bitwise | |
1942 | -- equality is fine for all these cases. | |
1943 | ||
1944 | if Is_Elementary_Type (Component_Type (Full_Type)) | |
1945 | and then not Is_Floating_Point_Type (Component_Type (Full_Type)) | |
1946 | then | |
1947 | return Make_Op_Eq (Loc, Left_Opnd => Lhs, Right_Opnd => Rhs); | |
1948 | ||
685094bf RD |
1949 | -- For composite component types, and floating-point types, use the |
1950 | -- expansion. This deals with tagged component types (where we use | |
1951 | -- the applicable equality routine) and floating-point, (where we | |
1952 | -- need to worry about negative zeroes), and also the case of any | |
1953 | -- composite type recursively containing such fields. | |
70482933 RK |
1954 | |
1955 | else | |
0da2c8ac | 1956 | return Expand_Array_Equality (Nod, Lhs, Rhs, Bodies, Full_Type); |
70482933 RK |
1957 | end if; |
1958 | ||
1959 | elsif Is_Tagged_Type (Full_Type) then | |
1960 | ||
1961 | -- Call the primitive operation "=" of this type | |
1962 | ||
1963 | if Is_Class_Wide_Type (Full_Type) then | |
1964 | Full_Type := Root_Type (Full_Type); | |
1965 | end if; | |
1966 | ||
685094bf RD |
1967 | -- If this is derived from an untagged private type completed with a |
1968 | -- tagged type, it does not have a full view, so we use the primitive | |
1969 | -- operations of the private type. This check should no longer be | |
1970 | -- necessary when these types receive their full views ??? | |
70482933 RK |
1971 | |
1972 | if Is_Private_Type (Typ) | |
1973 | and then not Is_Tagged_Type (Typ) | |
1974 | and then not Is_Controlled (Typ) | |
1975 | and then Is_Derived_Type (Typ) | |
1976 | and then No (Full_View (Typ)) | |
1977 | then | |
1978 | Prim := First_Elmt (Collect_Primitive_Operations (Typ)); | |
1979 | else | |
1980 | Prim := First_Elmt (Primitive_Operations (Full_Type)); | |
1981 | end if; | |
1982 | ||
1983 | loop | |
1984 | Eq_Op := Node (Prim); | |
1985 | exit when Chars (Eq_Op) = Name_Op_Eq | |
1986 | and then Etype (First_Formal (Eq_Op)) = | |
e6f69614 AC |
1987 | Etype (Next_Formal (First_Formal (Eq_Op))) |
1988 | and then Base_Type (Etype (Eq_Op)) = Standard_Boolean; | |
70482933 RK |
1989 | Next_Elmt (Prim); |
1990 | pragma Assert (Present (Prim)); | |
1991 | end loop; | |
1992 | ||
1993 | Eq_Op := Node (Prim); | |
1994 | ||
1995 | return | |
1996 | Make_Function_Call (Loc, | |
1997 | Name => New_Reference_To (Eq_Op, Loc), | |
1998 | Parameter_Associations => | |
1999 | New_List | |
2000 | (Unchecked_Convert_To (Etype (First_Formal (Eq_Op)), Lhs), | |
2001 | Unchecked_Convert_To (Etype (First_Formal (Eq_Op)), Rhs))); | |
2002 | ||
2003 | elsif Is_Record_Type (Full_Type) then | |
fbf5a39b | 2004 | Eq_Op := TSS (Full_Type, TSS_Composite_Equality); |
70482933 RK |
2005 | |
2006 | if Present (Eq_Op) then | |
2007 | if Etype (First_Formal (Eq_Op)) /= Full_Type then | |
2008 | ||
685094bf RD |
2009 | -- Inherited equality from parent type. Convert the actuals to |
2010 | -- match signature of operation. | |
70482933 RK |
2011 | |
2012 | declare | |
fbf5a39b | 2013 | T : constant Entity_Id := Etype (First_Formal (Eq_Op)); |
70482933 RK |
2014 | |
2015 | begin | |
2016 | return | |
2017 | Make_Function_Call (Loc, | |
2018 | Name => New_Reference_To (Eq_Op, Loc), | |
2019 | Parameter_Associations => | |
2020 | New_List (OK_Convert_To (T, Lhs), | |
2021 | OK_Convert_To (T, Rhs))); | |
2022 | end; | |
2023 | ||
2024 | else | |
5d09245e AC |
2025 | -- Comparison between Unchecked_Union components |
2026 | ||
2027 | if Is_Unchecked_Union (Full_Type) then | |
2028 | declare | |
2029 | Lhs_Type : Node_Id := Full_Type; | |
2030 | Rhs_Type : Node_Id := Full_Type; | |
2031 | Lhs_Discr_Val : Node_Id; | |
2032 | Rhs_Discr_Val : Node_Id; | |
2033 | ||
2034 | begin | |
2035 | -- Lhs subtype | |
2036 | ||
2037 | if Nkind (Lhs) = N_Selected_Component then | |
2038 | Lhs_Type := Etype (Entity (Selector_Name (Lhs))); | |
2039 | end if; | |
2040 | ||
2041 | -- Rhs subtype | |
2042 | ||
2043 | if Nkind (Rhs) = N_Selected_Component then | |
2044 | Rhs_Type := Etype (Entity (Selector_Name (Rhs))); | |
2045 | end if; | |
2046 | ||
2047 | -- Lhs of the composite equality | |
2048 | ||
2049 | if Is_Constrained (Lhs_Type) then | |
2050 | ||
685094bf | 2051 | -- Since the enclosing record type can never be an |
5d09245e AC |
2052 | -- Unchecked_Union (this code is executed for records |
2053 | -- that do not have variants), we may reference its | |
2054 | -- discriminant(s). | |
2055 | ||
2056 | if Nkind (Lhs) = N_Selected_Component | |
2057 | and then Has_Per_Object_Constraint ( | |
2058 | Entity (Selector_Name (Lhs))) | |
2059 | then | |
2060 | Lhs_Discr_Val := | |
2061 | Make_Selected_Component (Loc, | |
2062 | Prefix => Prefix (Lhs), | |
2063 | Selector_Name => | |
2064 | New_Copy ( | |
2065 | Get_Discriminant_Value ( | |
2066 | First_Discriminant (Lhs_Type), | |
2067 | Lhs_Type, | |
2068 | Stored_Constraint (Lhs_Type)))); | |
2069 | ||
2070 | else | |
2071 | Lhs_Discr_Val := New_Copy ( | |
2072 | Get_Discriminant_Value ( | |
2073 | First_Discriminant (Lhs_Type), | |
2074 | Lhs_Type, | |
2075 | Stored_Constraint (Lhs_Type))); | |
2076 | ||
2077 | end if; | |
2078 | else | |
2079 | -- It is not possible to infer the discriminant since | |
2080 | -- the subtype is not constrained. | |
2081 | ||
8aceda64 | 2082 | return |
5d09245e | 2083 | Make_Raise_Program_Error (Loc, |
8aceda64 | 2084 | Reason => PE_Unchecked_Union_Restriction); |
5d09245e AC |
2085 | end if; |
2086 | ||
2087 | -- Rhs of the composite equality | |
2088 | ||
2089 | if Is_Constrained (Rhs_Type) then | |
2090 | if Nkind (Rhs) = N_Selected_Component | |
2091 | and then Has_Per_Object_Constraint ( | |
2092 | Entity (Selector_Name (Rhs))) | |
2093 | then | |
2094 | Rhs_Discr_Val := | |
2095 | Make_Selected_Component (Loc, | |
2096 | Prefix => Prefix (Rhs), | |
2097 | Selector_Name => | |
2098 | New_Copy ( | |
2099 | Get_Discriminant_Value ( | |
2100 | First_Discriminant (Rhs_Type), | |
2101 | Rhs_Type, | |
2102 | Stored_Constraint (Rhs_Type)))); | |
2103 | ||
2104 | else | |
2105 | Rhs_Discr_Val := New_Copy ( | |
2106 | Get_Discriminant_Value ( | |
2107 | First_Discriminant (Rhs_Type), | |
2108 | Rhs_Type, | |
2109 | Stored_Constraint (Rhs_Type))); | |
2110 | ||
2111 | end if; | |
2112 | else | |
8aceda64 | 2113 | return |
5d09245e | 2114 | Make_Raise_Program_Error (Loc, |
8aceda64 | 2115 | Reason => PE_Unchecked_Union_Restriction); |
5d09245e AC |
2116 | end if; |
2117 | ||
2118 | -- Call the TSS equality function with the inferred | |
2119 | -- discriminant values. | |
2120 | ||
2121 | return | |
2122 | Make_Function_Call (Loc, | |
2123 | Name => New_Reference_To (Eq_Op, Loc), | |
2124 | Parameter_Associations => New_List ( | |
2125 | Lhs, | |
2126 | Rhs, | |
2127 | Lhs_Discr_Val, | |
2128 | Rhs_Discr_Val)); | |
2129 | end; | |
2130 | end if; | |
2131 | ||
685094bf RD |
2132 | -- Shouldn't this be an else, we can't fall through the above |
2133 | -- IF, right??? | |
5d09245e | 2134 | |
70482933 RK |
2135 | return |
2136 | Make_Function_Call (Loc, | |
2137 | Name => New_Reference_To (Eq_Op, Loc), | |
2138 | Parameter_Associations => New_List (Lhs, Rhs)); | |
2139 | end if; | |
2140 | ||
2141 | else | |
2142 | return Expand_Record_Equality (Nod, Full_Type, Lhs, Rhs, Bodies); | |
2143 | end if; | |
2144 | ||
2145 | else | |
2146 | -- It can be a simple record or the full view of a scalar private | |
2147 | ||
2148 | return Make_Op_Eq (Loc, Left_Opnd => Lhs, Right_Opnd => Rhs); | |
2149 | end if; | |
2150 | end Expand_Composite_Equality; | |
2151 | ||
fdac1f80 AC |
2152 | ------------------------ |
2153 | -- Expand_Concatenate -- | |
2154 | ------------------------ | |
70482933 | 2155 | |
fdac1f80 AC |
2156 | procedure Expand_Concatenate (Cnode : Node_Id; Opnds : List_Id) is |
2157 | Loc : constant Source_Ptr := Sloc (Cnode); | |
70482933 | 2158 | |
fdac1f80 AC |
2159 | Atyp : constant Entity_Id := Base_Type (Etype (Cnode)); |
2160 | -- Result type of concatenation | |
70482933 | 2161 | |
fdac1f80 AC |
2162 | Ctyp : constant Entity_Id := Base_Type (Component_Type (Etype (Cnode))); |
2163 | -- Component type. Elements of this component type can appear as one | |
2164 | -- of the operands of concatenation as well as arrays. | |
70482933 | 2165 | |
ecc4ddde AC |
2166 | Istyp : constant Entity_Id := Etype (First_Index (Atyp)); |
2167 | -- Index subtype | |
2168 | ||
2169 | Ityp : constant Entity_Id := Base_Type (Istyp); | |
2170 | -- Index type. This is the base type of the index subtype, and is used | |
2171 | -- for all computed bounds (which may be out of range of Istyp in the | |
2172 | -- case of null ranges). | |
70482933 | 2173 | |
46ff89f3 | 2174 | Artyp : Entity_Id; |
fdac1f80 AC |
2175 | -- This is the type we use to do arithmetic to compute the bounds and |
2176 | -- lengths of operands. The choice of this type is a little subtle and | |
2177 | -- is discussed in a separate section at the start of the body code. | |
70482933 | 2178 | |
fdac1f80 AC |
2179 | Concatenation_Error : exception; |
2180 | -- Raised if concatenation is sure to raise a CE | |
70482933 | 2181 | |
0ac73189 AC |
2182 | Result_May_Be_Null : Boolean := True; |
2183 | -- Reset to False if at least one operand is encountered which is known | |
2184 | -- at compile time to be non-null. Used for handling the special case | |
2185 | -- of setting the high bound to the last operand high bound for a null | |
2186 | -- result, thus ensuring a proper high bound in the super-flat case. | |
2187 | ||
df46b832 | 2188 | N : constant Nat := List_Length (Opnds); |
fdac1f80 | 2189 | -- Number of concatenation operands including possibly null operands |
df46b832 AC |
2190 | |
2191 | NN : Nat := 0; | |
a29262fd AC |
2192 | -- Number of operands excluding any known to be null, except that the |
2193 | -- last operand is always retained, in case it provides the bounds for | |
2194 | -- a null result. | |
2195 | ||
2196 | Opnd : Node_Id; | |
2197 | -- Current operand being processed in the loop through operands. After | |
2198 | -- this loop is complete, always contains the last operand (which is not | |
2199 | -- the same as Operands (NN), since null operands are skipped). | |
df46b832 AC |
2200 | |
2201 | -- Arrays describing the operands, only the first NN entries of each | |
2202 | -- array are set (NN < N when we exclude known null operands). | |
2203 | ||
2204 | Is_Fixed_Length : array (1 .. N) of Boolean; | |
2205 | -- True if length of corresponding operand known at compile time | |
2206 | ||
2207 | Operands : array (1 .. N) of Node_Id; | |
a29262fd AC |
2208 | -- Set to the corresponding entry in the Opnds list (but note that null |
2209 | -- operands are excluded, so not all entries in the list are stored). | |
df46b832 AC |
2210 | |
2211 | Fixed_Length : array (1 .. N) of Uint; | |
fdac1f80 AC |
2212 | -- Set to length of operand. Entries in this array are set only if the |
2213 | -- corresponding entry in Is_Fixed_Length is True. | |
df46b832 | 2214 | |
0ac73189 AC |
2215 | Opnd_Low_Bound : array (1 .. N) of Node_Id; |
2216 | -- Set to lower bound of operand. Either an integer literal in the case | |
2217 | -- where the bound is known at compile time, else actual lower bound. | |
2218 | -- The operand low bound is of type Ityp. | |
2219 | ||
df46b832 AC |
2220 | Var_Length : array (1 .. N) of Entity_Id; |
2221 | -- Set to an entity of type Natural that contains the length of an | |
2222 | -- operand whose length is not known at compile time. Entries in this | |
2223 | -- array are set only if the corresponding entry in Is_Fixed_Length | |
46ff89f3 | 2224 | -- is False. The entity is of type Artyp. |
df46b832 AC |
2225 | |
2226 | Aggr_Length : array (0 .. N) of Node_Id; | |
fdac1f80 AC |
2227 | -- The J'th entry in an expression node that represents the total length |
2228 | -- of operands 1 through J. It is either an integer literal node, or a | |
2229 | -- reference to a constant entity with the right value, so it is fine | |
2230 | -- to just do a Copy_Node to get an appropriate copy. The extra zero'th | |
46ff89f3 | 2231 | -- entry always is set to zero. The length is of type Artyp. |
df46b832 AC |
2232 | |
2233 | Low_Bound : Node_Id; | |
0ac73189 AC |
2234 | -- A tree node representing the low bound of the result (of type Ityp). |
2235 | -- This is either an integer literal node, or an identifier reference to | |
2236 | -- a constant entity initialized to the appropriate value. | |
2237 | ||
a29262fd AC |
2238 | Last_Opnd_High_Bound : Node_Id; |
2239 | -- A tree node representing the high bound of the last operand. This | |
2240 | -- need only be set if the result could be null. It is used for the | |
2241 | -- special case of setting the right high bound for a null result. | |
2242 | -- This is of type Ityp. | |
2243 | ||
0ac73189 AC |
2244 | High_Bound : Node_Id; |
2245 | -- A tree node representing the high bound of the result (of type Ityp) | |
df46b832 AC |
2246 | |
2247 | Result : Node_Id; | |
0ac73189 | 2248 | -- Result of the concatenation (of type Ityp) |
df46b832 | 2249 | |
fa969310 AC |
2250 | Known_Non_Null_Operand_Seen : Boolean; |
2251 | -- Set True during generation of the assignements of operands into | |
2252 | -- result once an operand known to be non-null has been seen. | |
2253 | ||
2254 | function Make_Artyp_Literal (Val : Nat) return Node_Id; | |
2255 | -- This function makes an N_Integer_Literal node that is returned in | |
2256 | -- analyzed form with the type set to Artyp. Importantly this literal | |
2257 | -- is not flagged as static, so that if we do computations with it that | |
2258 | -- result in statically detected out of range conditions, we will not | |
2259 | -- generate error messages but instead warning messages. | |
2260 | ||
46ff89f3 | 2261 | function To_Artyp (X : Node_Id) return Node_Id; |
fdac1f80 | 2262 | -- Given a node of type Ityp, returns the corresponding value of type |
76c597a1 AC |
2263 | -- Artyp. For non-enumeration types, this is a plain integer conversion. |
2264 | -- For enum types, the Pos of the value is returned. | |
fdac1f80 AC |
2265 | |
2266 | function To_Ityp (X : Node_Id) return Node_Id; | |
0ac73189 | 2267 | -- The inverse function (uses Val in the case of enumeration types) |
fdac1f80 | 2268 | |
fa969310 AC |
2269 | ------------------------ |
2270 | -- Make_Artyp_Literal -- | |
2271 | ------------------------ | |
2272 | ||
2273 | function Make_Artyp_Literal (Val : Nat) return Node_Id is | |
2274 | Result : constant Node_Id := Make_Integer_Literal (Loc, Val); | |
2275 | begin | |
2276 | Set_Etype (Result, Artyp); | |
2277 | Set_Analyzed (Result, True); | |
2278 | Set_Is_Static_Expression (Result, False); | |
2279 | return Result; | |
2280 | end Make_Artyp_Literal; | |
76c597a1 | 2281 | |
fdac1f80 | 2282 | -------------- |
46ff89f3 | 2283 | -- To_Artyp -- |
fdac1f80 AC |
2284 | -------------- |
2285 | ||
46ff89f3 | 2286 | function To_Artyp (X : Node_Id) return Node_Id is |
fdac1f80 | 2287 | begin |
46ff89f3 | 2288 | if Ityp = Base_Type (Artyp) then |
fdac1f80 AC |
2289 | return X; |
2290 | ||
2291 | elsif Is_Enumeration_Type (Ityp) then | |
2292 | return | |
2293 | Make_Attribute_Reference (Loc, | |
2294 | Prefix => New_Occurrence_Of (Ityp, Loc), | |
2295 | Attribute_Name => Name_Pos, | |
2296 | Expressions => New_List (X)); | |
2297 | ||
2298 | else | |
46ff89f3 | 2299 | return Convert_To (Artyp, X); |
fdac1f80 | 2300 | end if; |
46ff89f3 | 2301 | end To_Artyp; |
fdac1f80 AC |
2302 | |
2303 | ------------- | |
2304 | -- To_Ityp -- | |
2305 | ------------- | |
2306 | ||
2307 | function To_Ityp (X : Node_Id) return Node_Id is | |
2308 | begin | |
2fc05e3d | 2309 | if Is_Enumeration_Type (Ityp) then |
fdac1f80 AC |
2310 | return |
2311 | Make_Attribute_Reference (Loc, | |
2312 | Prefix => New_Occurrence_Of (Ityp, Loc), | |
2313 | Attribute_Name => Name_Val, | |
2314 | Expressions => New_List (X)); | |
2315 | ||
2316 | -- Case where we will do a type conversion | |
2317 | ||
2318 | else | |
76c597a1 AC |
2319 | if Ityp = Base_Type (Artyp) then |
2320 | return X; | |
fdac1f80 | 2321 | else |
76c597a1 | 2322 | return Convert_To (Ityp, X); |
fdac1f80 AC |
2323 | end if; |
2324 | end if; | |
2325 | end To_Ityp; | |
2326 | ||
2327 | -- Local Declarations | |
2328 | ||
0ac73189 AC |
2329 | Opnd_Typ : Entity_Id; |
2330 | Ent : Entity_Id; | |
2331 | Len : Uint; | |
2332 | J : Nat; | |
2333 | Clen : Node_Id; | |
2334 | Set : Boolean; | |
70482933 RK |
2335 | |
2336 | begin | |
fdac1f80 AC |
2337 | -- Choose an appropriate computational type |
2338 | ||
2339 | -- We will be doing calculations of lengths and bounds in this routine | |
2340 | -- and computing one from the other in some cases, e.g. getting the high | |
2341 | -- bound by adding the length-1 to the low bound. | |
2342 | ||
2343 | -- We can't just use the index type, or even its base type for this | |
2344 | -- purpose for two reasons. First it might be an enumeration type which | |
2345 | -- is not suitable fo computations of any kind, and second it may simply | |
2346 | -- not have enough range. For example if the index type is -128..+127 | |
2347 | -- then lengths can be up to 256, which is out of range of the type. | |
2348 | ||
2349 | -- For enumeration types, we can simply use Standard_Integer, this is | |
2350 | -- sufficient since the actual number of enumeration literals cannot | |
2351 | -- possibly exceed the range of integer (remember we will be doing the | |
0ac73189 | 2352 | -- arithmetic with POS values, not representation values). |
fdac1f80 AC |
2353 | |
2354 | if Is_Enumeration_Type (Ityp) then | |
46ff89f3 | 2355 | Artyp := Standard_Integer; |
fdac1f80 | 2356 | |
59262ebb AC |
2357 | -- If index type is Positive, we use the standard unsigned type, to give |
2358 | -- more room on the top of the range, obviating the need for an overflow | |
2359 | -- check when creating the upper bound. This is needed to avoid junk | |
2360 | -- overflow checks in the common case of String types. | |
2361 | ||
2362 | -- ??? Disabled for now | |
2363 | ||
2364 | -- elsif Istyp = Standard_Positive then | |
2365 | -- Artyp := Standard_Unsigned; | |
2366 | ||
2fc05e3d AC |
2367 | -- For modular types, we use a 32-bit modular type for types whose size |
2368 | -- is in the range 1-31 bits. For 32-bit unsigned types, we use the | |
2369 | -- identity type, and for larger unsigned types we use 64-bits. | |
fdac1f80 | 2370 | |
2fc05e3d | 2371 | elsif Is_Modular_Integer_Type (Ityp) then |
ecc4ddde | 2372 | if RM_Size (Ityp) < RM_Size (Standard_Unsigned) then |
46ff89f3 | 2373 | Artyp := Standard_Unsigned; |
ecc4ddde | 2374 | elsif RM_Size (Ityp) = RM_Size (Standard_Unsigned) then |
46ff89f3 | 2375 | Artyp := Ityp; |
fdac1f80 | 2376 | else |
46ff89f3 | 2377 | Artyp := RTE (RE_Long_Long_Unsigned); |
fdac1f80 AC |
2378 | end if; |
2379 | ||
2fc05e3d | 2380 | -- Similar treatment for signed types |
fdac1f80 AC |
2381 | |
2382 | else | |
ecc4ddde | 2383 | if RM_Size (Ityp) < RM_Size (Standard_Integer) then |
46ff89f3 | 2384 | Artyp := Standard_Integer; |
ecc4ddde | 2385 | elsif RM_Size (Ityp) = RM_Size (Standard_Integer) then |
46ff89f3 | 2386 | Artyp := Ityp; |
fdac1f80 | 2387 | else |
46ff89f3 | 2388 | Artyp := Standard_Long_Long_Integer; |
fdac1f80 AC |
2389 | end if; |
2390 | end if; | |
2391 | ||
fa969310 AC |
2392 | -- Supply dummy entry at start of length array |
2393 | ||
2394 | Aggr_Length (0) := Make_Artyp_Literal (0); | |
2395 | ||
fdac1f80 | 2396 | -- Go through operands setting up the above arrays |
70482933 | 2397 | |
df46b832 AC |
2398 | J := 1; |
2399 | while J <= N loop | |
2400 | Opnd := Remove_Head (Opnds); | |
0ac73189 | 2401 | Opnd_Typ := Etype (Opnd); |
fdac1f80 AC |
2402 | |
2403 | -- The parent got messed up when we put the operands in a list, | |
2404 | -- so now put back the proper parent for the saved operand. | |
2405 | ||
df46b832 | 2406 | Set_Parent (Opnd, Parent (Cnode)); |
fdac1f80 AC |
2407 | |
2408 | -- Set will be True when we have setup one entry in the array | |
2409 | ||
df46b832 AC |
2410 | Set := False; |
2411 | ||
fdac1f80 | 2412 | -- Singleton element (or character literal) case |
df46b832 | 2413 | |
0ac73189 | 2414 | if Base_Type (Opnd_Typ) = Ctyp then |
df46b832 AC |
2415 | NN := NN + 1; |
2416 | Operands (NN) := Opnd; | |
2417 | Is_Fixed_Length (NN) := True; | |
2418 | Fixed_Length (NN) := Uint_1; | |
0ac73189 | 2419 | Result_May_Be_Null := False; |
fdac1f80 | 2420 | |
a29262fd AC |
2421 | -- Set low bound of operand (no need to set Last_Opnd_High_Bound |
2422 | -- since we know that the result cannot be null). | |
fdac1f80 | 2423 | |
0ac73189 AC |
2424 | Opnd_Low_Bound (NN) := |
2425 | Make_Attribute_Reference (Loc, | |
ecc4ddde | 2426 | Prefix => New_Reference_To (Istyp, Loc), |
0ac73189 AC |
2427 | Attribute_Name => Name_First); |
2428 | ||
df46b832 AC |
2429 | Set := True; |
2430 | ||
fdac1f80 | 2431 | -- String literal case (can only occur for strings of course) |
df46b832 AC |
2432 | |
2433 | elsif Nkind (Opnd) = N_String_Literal then | |
0ac73189 | 2434 | Len := String_Literal_Length (Opnd_Typ); |
df46b832 | 2435 | |
a29262fd AC |
2436 | if Len /= 0 then |
2437 | Result_May_Be_Null := False; | |
2438 | end if; | |
2439 | ||
2440 | -- Capture last operand high bound if result could be null | |
2441 | ||
2442 | if J = N and then Result_May_Be_Null then | |
2443 | Last_Opnd_High_Bound := | |
2444 | Make_Op_Add (Loc, | |
2445 | Left_Opnd => | |
2446 | New_Copy_Tree (String_Literal_Low_Bound (Opnd_Typ)), | |
59262ebb | 2447 | Right_Opnd => Make_Integer_Literal (Loc, 1)); |
a29262fd AC |
2448 | end if; |
2449 | ||
2450 | -- Skip null string literal | |
fdac1f80 | 2451 | |
0ac73189 | 2452 | if J < N and then Len = 0 then |
df46b832 AC |
2453 | goto Continue; |
2454 | end if; | |
2455 | ||
2456 | NN := NN + 1; | |
2457 | Operands (NN) := Opnd; | |
2458 | Is_Fixed_Length (NN) := True; | |
0ac73189 AC |
2459 | |
2460 | -- Set length and bounds | |
2461 | ||
df46b832 | 2462 | Fixed_Length (NN) := Len; |
0ac73189 AC |
2463 | |
2464 | Opnd_Low_Bound (NN) := | |
2465 | New_Copy_Tree (String_Literal_Low_Bound (Opnd_Typ)); | |
2466 | ||
df46b832 AC |
2467 | Set := True; |
2468 | ||
2469 | -- All other cases | |
2470 | ||
2471 | else | |
2472 | -- Check constrained case with known bounds | |
2473 | ||
0ac73189 | 2474 | if Is_Constrained (Opnd_Typ) then |
df46b832 | 2475 | declare |
df46b832 AC |
2476 | Index : constant Node_Id := First_Index (Opnd_Typ); |
2477 | Indx_Typ : constant Entity_Id := Etype (Index); | |
2478 | Lo : constant Node_Id := Type_Low_Bound (Indx_Typ); | |
2479 | Hi : constant Node_Id := Type_High_Bound (Indx_Typ); | |
2480 | ||
2481 | begin | |
fdac1f80 AC |
2482 | -- Fixed length constrained array type with known at compile |
2483 | -- time bounds is last case of fixed length operand. | |
df46b832 AC |
2484 | |
2485 | if Compile_Time_Known_Value (Lo) | |
2486 | and then | |
2487 | Compile_Time_Known_Value (Hi) | |
2488 | then | |
2489 | declare | |
2490 | Loval : constant Uint := Expr_Value (Lo); | |
2491 | Hival : constant Uint := Expr_Value (Hi); | |
2492 | Len : constant Uint := | |
2493 | UI_Max (Hival - Loval + 1, Uint_0); | |
2494 | ||
2495 | begin | |
0ac73189 AC |
2496 | if Len > 0 then |
2497 | Result_May_Be_Null := False; | |
df46b832 | 2498 | end if; |
0ac73189 | 2499 | |
a29262fd AC |
2500 | -- Capture last operand bound if result could be null |
2501 | ||
2502 | if J = N and then Result_May_Be_Null then | |
2503 | Last_Opnd_High_Bound := | |
2504 | Convert_To (Ityp, | |
2505 | Make_Integer_Literal (Loc, | |
2506 | Intval => Expr_Value (Hi))); | |
2507 | end if; | |
2508 | ||
2509 | -- Exclude null length case unless last operand | |
0ac73189 | 2510 | |
a29262fd | 2511 | if J < N and then Len = 0 then |
0ac73189 AC |
2512 | goto Continue; |
2513 | end if; | |
2514 | ||
2515 | NN := NN + 1; | |
2516 | Operands (NN) := Opnd; | |
2517 | Is_Fixed_Length (NN) := True; | |
2518 | Fixed_Length (NN) := Len; | |
2519 | ||
a2dc5812 | 2520 | Opnd_Low_Bound (NN) := To_Ityp ( |
0ac73189 | 2521 | Make_Integer_Literal (Loc, |
a2dc5812 | 2522 | Intval => Expr_Value (Lo))); |
0ac73189 | 2523 | |
0ac73189 | 2524 | Set := True; |
df46b832 AC |
2525 | end; |
2526 | end if; | |
2527 | end; | |
2528 | end if; | |
2529 | ||
0ac73189 AC |
2530 | -- All cases where the length is not known at compile time, or the |
2531 | -- special case of an operand which is known to be null but has a | |
2532 | -- lower bound other than 1 or is other than a string type. | |
df46b832 AC |
2533 | |
2534 | if not Set then | |
2535 | NN := NN + 1; | |
0ac73189 AC |
2536 | |
2537 | -- Capture operand bounds | |
2538 | ||
2539 | Opnd_Low_Bound (NN) := | |
2540 | Make_Attribute_Reference (Loc, | |
2541 | Prefix => | |
2542 | Duplicate_Subexpr (Opnd, Name_Req => True), | |
2543 | Attribute_Name => Name_First); | |
2544 | ||
a29262fd AC |
2545 | if J = N and Result_May_Be_Null then |
2546 | Last_Opnd_High_Bound := | |
2547 | Convert_To (Ityp, | |
2548 | Make_Attribute_Reference (Loc, | |
2549 | Prefix => | |
2550 | Duplicate_Subexpr (Opnd, Name_Req => True), | |
2551 | Attribute_Name => Name_Last)); | |
2552 | end if; | |
0ac73189 AC |
2553 | |
2554 | -- Capture length of operand in entity | |
2555 | ||
df46b832 AC |
2556 | Operands (NN) := Opnd; |
2557 | Is_Fixed_Length (NN) := False; | |
2558 | ||
2559 | Var_Length (NN) := | |
2560 | Make_Defining_Identifier (Loc, | |
2561 | Chars => New_Internal_Name ('L')); | |
2562 | ||
2563 | Insert_Action (Cnode, | |
2564 | Make_Object_Declaration (Loc, | |
2565 | Defining_Identifier => Var_Length (NN), | |
2566 | Constant_Present => True, | |
2567 | ||
2568 | Object_Definition => | |
46ff89f3 | 2569 | New_Occurrence_Of (Artyp, Loc), |
df46b832 AC |
2570 | |
2571 | Expression => | |
2572 | Make_Attribute_Reference (Loc, | |
2573 | Prefix => | |
2574 | Duplicate_Subexpr (Opnd, Name_Req => True), | |
2575 | Attribute_Name => Name_Length)), | |
2576 | ||
2577 | Suppress => All_Checks); | |
2578 | end if; | |
2579 | end if; | |
2580 | ||
2581 | -- Set next entry in aggregate length array | |
2582 | ||
2583 | -- For first entry, make either integer literal for fixed length | |
0ac73189 | 2584 | -- or a reference to the saved length for variable length. |
df46b832 AC |
2585 | |
2586 | if NN = 1 then | |
2587 | if Is_Fixed_Length (1) then | |
2588 | Aggr_Length (1) := | |
2589 | Make_Integer_Literal (Loc, | |
2590 | Intval => Fixed_Length (1)); | |
2591 | else | |
2592 | Aggr_Length (1) := | |
2593 | New_Reference_To (Var_Length (1), Loc); | |
2594 | end if; | |
2595 | ||
2596 | -- If entry is fixed length and only fixed lengths so far, make | |
2597 | -- appropriate new integer literal adding new length. | |
2598 | ||
2599 | elsif Is_Fixed_Length (NN) | |
2600 | and then Nkind (Aggr_Length (NN - 1)) = N_Integer_Literal | |
2601 | then | |
2602 | Aggr_Length (NN) := | |
2603 | Make_Integer_Literal (Loc, | |
2604 | Intval => Fixed_Length (NN) + Intval (Aggr_Length (NN - 1))); | |
2605 | ||
2606 | -- All other cases, construct an addition node for the length and | |
2607 | -- create an entity initialized to this length. | |
2608 | ||
2609 | else | |
2610 | Ent := | |
2611 | Make_Defining_Identifier (Loc, | |
2612 | Chars => New_Internal_Name ('L')); | |
2613 | ||
2614 | if Is_Fixed_Length (NN) then | |
2615 | Clen := Make_Integer_Literal (Loc, Fixed_Length (NN)); | |
2616 | else | |
2617 | Clen := New_Reference_To (Var_Length (NN), Loc); | |
2618 | end if; | |
2619 | ||
2620 | Insert_Action (Cnode, | |
2621 | Make_Object_Declaration (Loc, | |
2622 | Defining_Identifier => Ent, | |
2623 | Constant_Present => True, | |
2624 | ||
2625 | Object_Definition => | |
46ff89f3 | 2626 | New_Occurrence_Of (Artyp, Loc), |
df46b832 AC |
2627 | |
2628 | Expression => | |
2629 | Make_Op_Add (Loc, | |
2630 | Left_Opnd => New_Copy (Aggr_Length (NN - 1)), | |
2631 | Right_Opnd => Clen)), | |
2632 | ||
2633 | Suppress => All_Checks); | |
2634 | ||
76c597a1 | 2635 | Aggr_Length (NN) := Make_Identifier (Loc, Chars => Chars (Ent)); |
df46b832 AC |
2636 | end if; |
2637 | ||
2638 | <<Continue>> | |
2639 | J := J + 1; | |
2640 | end loop; | |
2641 | ||
a29262fd | 2642 | -- If we have only skipped null operands, return the last operand |
df46b832 AC |
2643 | |
2644 | if NN = 0 then | |
a29262fd | 2645 | Result := Opnd; |
df46b832 AC |
2646 | goto Done; |
2647 | end if; | |
2648 | ||
2649 | -- If we have only one non-null operand, return it and we are done. | |
2650 | -- There is one case in which this cannot be done, and that is when | |
fdac1f80 AC |
2651 | -- the sole operand is of the element type, in which case it must be |
2652 | -- converted to an array, and the easiest way of doing that is to go | |
df46b832 AC |
2653 | -- through the normal general circuit. |
2654 | ||
2655 | if NN = 1 | |
fdac1f80 | 2656 | and then Base_Type (Etype (Operands (1))) /= Ctyp |
df46b832 AC |
2657 | then |
2658 | Result := Operands (1); | |
2659 | goto Done; | |
2660 | end if; | |
2661 | ||
2662 | -- Cases where we have a real concatenation | |
2663 | ||
fdac1f80 AC |
2664 | -- Next step is to find the low bound for the result array that we |
2665 | -- will allocate. The rules for this are in (RM 4.5.6(5-7)). | |
2666 | ||
2667 | -- If the ultimate ancestor of the index subtype is a constrained array | |
2668 | -- definition, then the lower bound is that of the index subtype as | |
2669 | -- specified by (RM 4.5.3(6)). | |
2670 | ||
2671 | -- The right test here is to go to the root type, and then the ultimate | |
2672 | -- ancestor is the first subtype of this root type. | |
2673 | ||
2674 | if Is_Constrained (First_Subtype (Root_Type (Atyp))) then | |
0ac73189 | 2675 | Low_Bound := |
fdac1f80 AC |
2676 | Make_Attribute_Reference (Loc, |
2677 | Prefix => | |
2678 | New_Occurrence_Of (First_Subtype (Root_Type (Atyp)), Loc), | |
0ac73189 | 2679 | Attribute_Name => Name_First); |
df46b832 AC |
2680 | |
2681 | -- If the first operand in the list has known length we know that | |
2682 | -- the lower bound of the result is the lower bound of this operand. | |
2683 | ||
fdac1f80 | 2684 | elsif Is_Fixed_Length (1) then |
0ac73189 | 2685 | Low_Bound := Opnd_Low_Bound (1); |
df46b832 AC |
2686 | |
2687 | -- OK, we don't know the lower bound, we have to build a horrible | |
2688 | -- expression actions node of the form | |
2689 | ||
2690 | -- if Cond1'Length /= 0 then | |
0ac73189 | 2691 | -- Opnd1 low bound |
df46b832 AC |
2692 | -- else |
2693 | -- if Opnd2'Length /= 0 then | |
0ac73189 | 2694 | -- Opnd2 low bound |
df46b832 AC |
2695 | -- else |
2696 | -- ... | |
2697 | ||
2698 | -- The nesting ends either when we hit an operand whose length is known | |
2699 | -- at compile time, or on reaching the last operand, whose low bound we | |
2700 | -- take unconditionally whether or not it is null. It's easiest to do | |
2701 | -- this with a recursive procedure: | |
2702 | ||
2703 | else | |
2704 | declare | |
2705 | function Get_Known_Bound (J : Nat) return Node_Id; | |
2706 | -- Returns the lower bound determined by operands J .. NN | |
2707 | ||
2708 | --------------------- | |
2709 | -- Get_Known_Bound -- | |
2710 | --------------------- | |
2711 | ||
2712 | function Get_Known_Bound (J : Nat) return Node_Id is | |
df46b832 | 2713 | begin |
0ac73189 AC |
2714 | if Is_Fixed_Length (J) or else J = NN then |
2715 | return New_Copy (Opnd_Low_Bound (J)); | |
70482933 RK |
2716 | |
2717 | else | |
df46b832 AC |
2718 | return |
2719 | Make_Conditional_Expression (Loc, | |
2720 | Expressions => New_List ( | |
2721 | ||
2722 | Make_Op_Ne (Loc, | |
2723 | Left_Opnd => New_Reference_To (Var_Length (J), Loc), | |
2724 | Right_Opnd => Make_Integer_Literal (Loc, 0)), | |
2725 | ||
0ac73189 | 2726 | New_Copy (Opnd_Low_Bound (J)), |
df46b832 | 2727 | Get_Known_Bound (J + 1))); |
70482933 | 2728 | end if; |
df46b832 | 2729 | end Get_Known_Bound; |
70482933 | 2730 | |
df46b832 AC |
2731 | begin |
2732 | Ent := | |
76c597a1 | 2733 | Make_Defining_Identifier (Loc, Chars => New_Internal_Name ('L')); |
df46b832 AC |
2734 | |
2735 | Insert_Action (Cnode, | |
2736 | Make_Object_Declaration (Loc, | |
2737 | Defining_Identifier => Ent, | |
2738 | Constant_Present => True, | |
0ac73189 | 2739 | Object_Definition => New_Occurrence_Of (Ityp, Loc), |
df46b832 AC |
2740 | Expression => Get_Known_Bound (1)), |
2741 | Suppress => All_Checks); | |
2742 | ||
2743 | Low_Bound := New_Reference_To (Ent, Loc); | |
2744 | end; | |
2745 | end if; | |
70482933 | 2746 | |
76c597a1 AC |
2747 | -- Now we can safely compute the upper bound, normally |
2748 | -- Low_Bound + Length - 1. | |
0ac73189 AC |
2749 | |
2750 | High_Bound := | |
2751 | To_Ityp ( | |
2752 | Make_Op_Add (Loc, | |
46ff89f3 | 2753 | Left_Opnd => To_Artyp (New_Copy (Low_Bound)), |
0ac73189 AC |
2754 | Right_Opnd => |
2755 | Make_Op_Subtract (Loc, | |
2756 | Left_Opnd => New_Copy (Aggr_Length (NN)), | |
fa969310 | 2757 | Right_Opnd => Make_Artyp_Literal (1)))); |
0ac73189 | 2758 | |
59262ebb AC |
2759 | -- Note that calculation of the high bound may cause overflow in some |
2760 | -- very weird cases, so in the general case we need an overflow check | |
2761 | -- on the high bound. We can avoid this for the common case of string | |
2762 | -- types since we chose a wider range for the arithmetic type. | |
76c597a1 | 2763 | |
59262ebb AC |
2764 | if Istyp /= Standard_Positive then |
2765 | Activate_Overflow_Check (High_Bound); | |
2766 | end if; | |
76c597a1 AC |
2767 | |
2768 | -- Handle the exceptional case where the result is null, in which case | |
a29262fd AC |
2769 | -- case the bounds come from the last operand (so that we get the proper |
2770 | -- bounds if the last operand is super-flat). | |
2771 | ||
0ac73189 AC |
2772 | if Result_May_Be_Null then |
2773 | High_Bound := | |
2774 | Make_Conditional_Expression (Loc, | |
2775 | Expressions => New_List ( | |
2776 | Make_Op_Eq (Loc, | |
2777 | Left_Opnd => New_Copy (Aggr_Length (NN)), | |
fa969310 | 2778 | Right_Opnd => Make_Artyp_Literal (0)), |
a29262fd | 2779 | Last_Opnd_High_Bound, |
0ac73189 AC |
2780 | High_Bound)); |
2781 | end if; | |
2782 | ||
2783 | -- Now we construct an array object with appropriate bounds | |
70482933 | 2784 | |
df46b832 AC |
2785 | Ent := |
2786 | Make_Defining_Identifier (Loc, | |
2787 | Chars => New_Internal_Name ('S')); | |
70482933 | 2788 | |
76c597a1 | 2789 | -- If the bound is statically known to be out of range, we do not want |
fa969310 AC |
2790 | -- to abort, we want a warning and a runtime constraint error. Note that |
2791 | -- we have arranged that the result will not be treated as a static | |
2792 | -- constant, so we won't get an illegality during this insertion. | |
76c597a1 | 2793 | |
df46b832 AC |
2794 | Insert_Action (Cnode, |
2795 | Make_Object_Declaration (Loc, | |
2796 | Defining_Identifier => Ent, | |
df46b832 AC |
2797 | Object_Definition => |
2798 | Make_Subtype_Indication (Loc, | |
fdac1f80 | 2799 | Subtype_Mark => New_Occurrence_Of (Atyp, Loc), |
df46b832 AC |
2800 | Constraint => |
2801 | Make_Index_Or_Discriminant_Constraint (Loc, | |
2802 | Constraints => New_List ( | |
2803 | Make_Range (Loc, | |
0ac73189 AC |
2804 | Low_Bound => Low_Bound, |
2805 | High_Bound => High_Bound))))), | |
df46b832 AC |
2806 | Suppress => All_Checks); |
2807 | ||
76c597a1 AC |
2808 | -- Catch the static out of range case now |
2809 | ||
2810 | if Raises_Constraint_Error (High_Bound) then | |
2811 | raise Concatenation_Error; | |
2812 | end if; | |
2813 | ||
df46b832 AC |
2814 | -- Now we will generate the assignments to do the actual concatenation |
2815 | ||
76c597a1 AC |
2816 | Known_Non_Null_Operand_Seen := False; |
2817 | ||
df46b832 AC |
2818 | for J in 1 .. NN loop |
2819 | declare | |
2820 | Lo : constant Node_Id := | |
2821 | Make_Op_Add (Loc, | |
46ff89f3 | 2822 | Left_Opnd => To_Artyp (New_Copy (Low_Bound)), |
df46b832 AC |
2823 | Right_Opnd => Aggr_Length (J - 1)); |
2824 | ||
2825 | Hi : constant Node_Id := | |
2826 | Make_Op_Add (Loc, | |
46ff89f3 | 2827 | Left_Opnd => To_Artyp (New_Copy (Low_Bound)), |
df46b832 AC |
2828 | Right_Opnd => |
2829 | Make_Op_Subtract (Loc, | |
2830 | Left_Opnd => Aggr_Length (J), | |
fa969310 | 2831 | Right_Opnd => Make_Artyp_Literal (1))); |
70482933 | 2832 | |
df46b832 | 2833 | begin |
fdac1f80 AC |
2834 | -- Singleton case, simple assignment |
2835 | ||
2836 | if Base_Type (Etype (Operands (J))) = Ctyp then | |
76c597a1 | 2837 | Known_Non_Null_Operand_Seen := True; |
df46b832 AC |
2838 | Insert_Action (Cnode, |
2839 | Make_Assignment_Statement (Loc, | |
2840 | Name => | |
2841 | Make_Indexed_Component (Loc, | |
2842 | Prefix => New_Occurrence_Of (Ent, Loc), | |
fdac1f80 | 2843 | Expressions => New_List (To_Ityp (Lo))), |
df46b832 AC |
2844 | Expression => Operands (J)), |
2845 | Suppress => All_Checks); | |
70482933 | 2846 | |
76c597a1 AC |
2847 | -- Array case, slice assignment, skipped when argument is fixed |
2848 | -- length and known to be null. | |
fdac1f80 | 2849 | |
76c597a1 AC |
2850 | elsif (not Is_Fixed_Length (J)) or else (Fixed_Length (J) > 0) then |
2851 | declare | |
2852 | Assign : Node_Id := | |
2853 | Make_Assignment_Statement (Loc, | |
2854 | Name => | |
2855 | Make_Slice (Loc, | |
2856 | Prefix => | |
2857 | New_Occurrence_Of (Ent, Loc), | |
2858 | Discrete_Range => | |
2859 | Make_Range (Loc, | |
2860 | Low_Bound => To_Ityp (Lo), | |
2861 | High_Bound => To_Ityp (Hi))), | |
2862 | Expression => Operands (J)); | |
2863 | begin | |
2864 | if Is_Fixed_Length (J) then | |
2865 | Known_Non_Null_Operand_Seen := True; | |
2866 | ||
2867 | elsif not Known_Non_Null_Operand_Seen then | |
2868 | ||
2869 | -- Here if operand length is not statically known and no | |
2870 | -- operand known to be non-null has been processed yet. | |
2871 | -- If operand length is 0, we do not need to perform the | |
2872 | -- assignment, and we must avoid the evaluation of the | |
2873 | -- high bound of the slice, since it may underflow if the | |
2874 | -- low bound is Ityp'First. | |
2875 | ||
2876 | Assign := | |
2877 | Make_Implicit_If_Statement (Cnode, | |
2878 | Condition => | |
2879 | Make_Op_Ne (Loc, | |
2880 | Left_Opnd => | |
2881 | New_Occurrence_Of (Var_Length (J), Loc), | |
2882 | Right_Opnd => Make_Integer_Literal (Loc, 0)), | |
2883 | Then_Statements => | |
2884 | New_List (Assign)); | |
2885 | end if; | |
fa969310 | 2886 | |
76c597a1 AC |
2887 | Insert_Action (Cnode, Assign, Suppress => All_Checks); |
2888 | end; | |
df46b832 AC |
2889 | end if; |
2890 | end; | |
2891 | end loop; | |
70482933 | 2892 | |
0ac73189 AC |
2893 | -- Finally we build the result, which is a reference to the array object |
2894 | ||
df46b832 | 2895 | Result := New_Reference_To (Ent, Loc); |
70482933 | 2896 | |
df46b832 AC |
2897 | <<Done>> |
2898 | Rewrite (Cnode, Result); | |
fdac1f80 AC |
2899 | Analyze_And_Resolve (Cnode, Atyp); |
2900 | ||
2901 | exception | |
2902 | when Concatenation_Error => | |
76c597a1 AC |
2903 | |
2904 | -- Kill warning generated for the declaration of the static out of | |
2905 | -- range high bound, and instead generate a Constraint_Error with | |
2906 | -- an appropriate specific message. | |
2907 | ||
2908 | Kill_Dead_Code (Declaration_Node (Entity (High_Bound))); | |
2909 | Apply_Compile_Time_Constraint_Error | |
2910 | (N => Cnode, | |
2911 | Msg => "concatenation result upper bound out of range?", | |
2912 | Reason => CE_Range_Check_Failed); | |
2913 | -- Set_Etype (Cnode, Atyp); | |
fdac1f80 | 2914 | end Expand_Concatenate; |
70482933 RK |
2915 | |
2916 | ------------------------ | |
2917 | -- Expand_N_Allocator -- | |
2918 | ------------------------ | |
2919 | ||
2920 | procedure Expand_N_Allocator (N : Node_Id) is | |
2921 | PtrT : constant Entity_Id := Etype (N); | |
0da2c8ac | 2922 | Dtyp : constant Entity_Id := Designated_Type (PtrT); |
f82944b7 | 2923 | Etyp : constant Entity_Id := Etype (Expression (N)); |
70482933 | 2924 | Loc : constant Source_Ptr := Sloc (N); |
f82944b7 | 2925 | Desig : Entity_Id; |
70482933 | 2926 | Temp : Entity_Id; |
26bff3d9 | 2927 | Nod : Node_Id; |
70482933 | 2928 | |
26bff3d9 JM |
2929 | procedure Complete_Coextension_Finalization; |
2930 | -- Generate finalization calls for all nested coextensions of N. This | |
2931 | -- routine may allocate list controllers if necessary. | |
0669bebe | 2932 | |
26bff3d9 JM |
2933 | procedure Rewrite_Coextension (N : Node_Id); |
2934 | -- Static coextensions have the same lifetime as the entity they | |
8fc789c8 | 2935 | -- constrain. Such occurrences can be rewritten as aliased objects |
26bff3d9 | 2936 | -- and their unrestricted access used instead of the coextension. |
0669bebe | 2937 | |
26bff3d9 JM |
2938 | --------------------------------------- |
2939 | -- Complete_Coextension_Finalization -- | |
2940 | --------------------------------------- | |
0669bebe | 2941 | |
26bff3d9 JM |
2942 | procedure Complete_Coextension_Finalization is |
2943 | Coext : Node_Id; | |
2944 | Coext_Elmt : Elmt_Id; | |
2945 | Flist : Node_Id; | |
2946 | Ref : Node_Id; | |
0669bebe | 2947 | |
26bff3d9 JM |
2948 | function Inside_A_Return_Statement (N : Node_Id) return Boolean; |
2949 | -- Determine whether node N is part of a return statement | |
2950 | ||
2951 | function Needs_Initialization_Call (N : Node_Id) return Boolean; | |
2952 | -- Determine whether node N is a subtype indicator allocator which | |
b4592168 | 2953 | -- acts a coextension. Such coextensions need initialization. |
26bff3d9 JM |
2954 | |
2955 | ------------------------------- | |
2956 | -- Inside_A_Return_Statement -- | |
2957 | ------------------------------- | |
2958 | ||
2959 | function Inside_A_Return_Statement (N : Node_Id) return Boolean is | |
2960 | P : Node_Id; | |
2961 | ||
2962 | begin | |
2963 | P := Parent (N); | |
2964 | while Present (P) loop | |
303b4d58 AC |
2965 | if Nkind_In |
2966 | (P, N_Extended_Return_Statement, N_Simple_Return_Statement) | |
26bff3d9 JM |
2967 | then |
2968 | return True; | |
2969 | ||
2970 | -- Stop the traversal when we reach a subprogram body | |
2971 | ||
2972 | elsif Nkind (P) = N_Subprogram_Body then | |
2973 | return False; | |
2974 | end if; | |
2975 | ||
2976 | P := Parent (P); | |
2977 | end loop; | |
2978 | ||
2979 | return False; | |
2980 | end Inside_A_Return_Statement; | |
2981 | ||
2982 | ------------------------------- | |
2983 | -- Needs_Initialization_Call -- | |
2984 | ------------------------------- | |
2985 | ||
2986 | function Needs_Initialization_Call (N : Node_Id) return Boolean is | |
2987 | Obj_Decl : Node_Id; | |
2988 | ||
2989 | begin | |
2990 | if Nkind (N) = N_Explicit_Dereference | |
2991 | and then Nkind (Prefix (N)) = N_Identifier | |
2992 | and then Nkind (Parent (Entity (Prefix (N)))) = | |
2993 | N_Object_Declaration | |
2994 | then | |
2995 | Obj_Decl := Parent (Entity (Prefix (N))); | |
0669bebe | 2996 | |
26bff3d9 JM |
2997 | return |
2998 | Present (Expression (Obj_Decl)) | |
2999 | and then Nkind (Expression (Obj_Decl)) = N_Allocator | |
3000 | and then Nkind (Expression (Expression (Obj_Decl))) /= | |
3001 | N_Qualified_Expression; | |
0669bebe GB |
3002 | end if; |
3003 | ||
26bff3d9 JM |
3004 | return False; |
3005 | end Needs_Initialization_Call; | |
3006 | ||
3007 | -- Start of processing for Complete_Coextension_Finalization | |
3008 | ||
3009 | begin | |
3010 | -- When a coextension root is inside a return statement, we need to | |
3011 | -- use the finalization chain of the function's scope. This does not | |
3012 | -- apply for controlled named access types because in those cases we | |
3013 | -- can use the finalization chain of the type itself. | |
3014 | ||
3015 | if Inside_A_Return_Statement (N) | |
3016 | and then | |
3017 | (Ekind (PtrT) = E_Anonymous_Access_Type | |
3018 | or else | |
3019 | (Ekind (PtrT) = E_Access_Type | |
3020 | and then No (Associated_Final_Chain (PtrT)))) | |
3021 | then | |
0669bebe | 3022 | declare |
26bff3d9 JM |
3023 | Decl : Node_Id; |
3024 | Outer_S : Entity_Id; | |
3025 | S : Entity_Id := Current_Scope; | |
0669bebe GB |
3026 | |
3027 | begin | |
26bff3d9 JM |
3028 | while Present (S) and then S /= Standard_Standard loop |
3029 | if Ekind (S) = E_Function then | |
3030 | Outer_S := Scope (S); | |
3031 | ||
3032 | -- Retrieve the declaration of the body | |
3033 | ||
3034 | Decl := Parent (Parent ( | |
3035 | Corresponding_Body (Parent (Parent (S))))); | |
3036 | exit; | |
3037 | end if; | |
3038 | ||
3039 | S := Scope (S); | |
0669bebe GB |
3040 | end loop; |
3041 | ||
26bff3d9 JM |
3042 | -- Push the scope of the function body since we are inserting |
3043 | -- the list before the body, but we are currently in the body | |
3044 | -- itself. Override the finalization list of PtrT since the | |
3045 | -- finalization context is now different. | |
3046 | ||
3047 | Push_Scope (Outer_S); | |
3048 | Build_Final_List (Decl, PtrT); | |
3049 | Pop_Scope; | |
0669bebe GB |
3050 | end; |
3051 | ||
26bff3d9 JM |
3052 | -- The root allocator may not be controlled, but it still needs a |
3053 | -- finalization list for all nested coextensions. | |
0669bebe | 3054 | |
26bff3d9 JM |
3055 | elsif No (Associated_Final_Chain (PtrT)) then |
3056 | Build_Final_List (N, PtrT); | |
3057 | end if; | |
0669bebe | 3058 | |
26bff3d9 JM |
3059 | Flist := |
3060 | Make_Selected_Component (Loc, | |
3061 | Prefix => | |
3062 | New_Reference_To (Associated_Final_Chain (PtrT), Loc), | |
3063 | Selector_Name => | |
3064 | Make_Identifier (Loc, Name_F)); | |
3065 | ||
3066 | Coext_Elmt := First_Elmt (Coextensions (N)); | |
3067 | while Present (Coext_Elmt) loop | |
3068 | Coext := Node (Coext_Elmt); | |
3069 | ||
3070 | -- Generate: | |
3071 | -- typ! (coext.all) | |
3072 | ||
3073 | if Nkind (Coext) = N_Identifier then | |
685094bf RD |
3074 | Ref := |
3075 | Make_Unchecked_Type_Conversion (Loc, | |
3076 | Subtype_Mark => New_Reference_To (Etype (Coext), Loc), | |
3077 | Expression => | |
3078 | Make_Explicit_Dereference (Loc, | |
3079 | Prefix => New_Copy_Tree (Coext))); | |
26bff3d9 JM |
3080 | else |
3081 | Ref := New_Copy_Tree (Coext); | |
3082 | end if; | |
0669bebe | 3083 | |
b4592168 | 3084 | -- No initialization call if not allowed |
26bff3d9 | 3085 | |
b4592168 | 3086 | Check_Restriction (No_Default_Initialization, N); |
26bff3d9 | 3087 | |
b4592168 | 3088 | if not Restriction_Active (No_Default_Initialization) then |
26bff3d9 | 3089 | |
b4592168 GD |
3090 | -- Generate: |
3091 | -- initialize (Ref) | |
3092 | -- attach_to_final_list (Ref, Flist, 2) | |
3093 | ||
3094 | if Needs_Initialization_Call (Coext) then | |
3095 | Insert_Actions (N, | |
3096 | Make_Init_Call ( | |
3097 | Ref => Ref, | |
3098 | Typ => Etype (Coext), | |
3099 | Flist_Ref => Flist, | |
3100 | With_Attach => Make_Integer_Literal (Loc, Uint_2))); | |
3101 | ||
3102 | -- Generate: | |
3103 | -- attach_to_final_list (Ref, Flist, 2) | |
3104 | ||
3105 | else | |
3106 | Insert_Action (N, | |
3107 | Make_Attach_Call ( | |
3108 | Obj_Ref => Ref, | |
3109 | Flist_Ref => New_Copy_Tree (Flist), | |
3110 | With_Attach => Make_Integer_Literal (Loc, Uint_2))); | |
3111 | end if; | |
26bff3d9 JM |
3112 | end if; |
3113 | ||
3114 | Next_Elmt (Coext_Elmt); | |
3115 | end loop; | |
3116 | end Complete_Coextension_Finalization; | |
3117 | ||
3118 | ------------------------- | |
3119 | -- Rewrite_Coextension -- | |
3120 | ------------------------- | |
3121 | ||
3122 | procedure Rewrite_Coextension (N : Node_Id) is | |
3123 | Temp : constant Node_Id := | |
3124 | Make_Defining_Identifier (Loc, | |
3125 | New_Internal_Name ('C')); | |
3126 | ||
3127 | -- Generate: | |
3128 | -- Cnn : aliased Etyp; | |
3129 | ||
3130 | Decl : constant Node_Id := | |
3131 | Make_Object_Declaration (Loc, | |
3132 | Defining_Identifier => Temp, | |
3133 | Aliased_Present => True, | |
3134 | Object_Definition => | |
3135 | New_Occurrence_Of (Etyp, Loc)); | |
3136 | Nod : Node_Id; | |
3137 | ||
3138 | begin | |
3139 | if Nkind (Expression (N)) = N_Qualified_Expression then | |
3140 | Set_Expression (Decl, Expression (Expression (N))); | |
0669bebe | 3141 | end if; |
26bff3d9 JM |
3142 | |
3143 | -- Find the proper insertion node for the declaration | |
3144 | ||
3145 | Nod := Parent (N); | |
3146 | while Present (Nod) loop | |
3147 | exit when Nkind (Nod) in N_Statement_Other_Than_Procedure_Call | |
3148 | or else Nkind (Nod) = N_Procedure_Call_Statement | |
3149 | or else Nkind (Nod) in N_Declaration; | |
3150 | Nod := Parent (Nod); | |
3151 | end loop; | |
3152 | ||
3153 | Insert_Before (Nod, Decl); | |
3154 | Analyze (Decl); | |
3155 | ||
3156 | Rewrite (N, | |
3157 | Make_Attribute_Reference (Loc, | |
3158 | Prefix => New_Occurrence_Of (Temp, Loc), | |
3159 | Attribute_Name => Name_Unrestricted_Access)); | |
3160 | ||
3161 | Analyze_And_Resolve (N, PtrT); | |
3162 | end Rewrite_Coextension; | |
0669bebe GB |
3163 | |
3164 | -- Start of processing for Expand_N_Allocator | |
3165 | ||
70482933 RK |
3166 | begin |
3167 | -- RM E.2.3(22). We enforce that the expected type of an allocator | |
3168 | -- shall not be a remote access-to-class-wide-limited-private type | |
3169 | ||
3170 | -- Why is this being done at expansion time, seems clearly wrong ??? | |
3171 | ||
3172 | Validate_Remote_Access_To_Class_Wide_Type (N); | |
3173 | ||
3174 | -- Set the Storage Pool | |
3175 | ||
3176 | Set_Storage_Pool (N, Associated_Storage_Pool (Root_Type (PtrT))); | |
3177 | ||
3178 | if Present (Storage_Pool (N)) then | |
3179 | if Is_RTE (Storage_Pool (N), RE_SS_Pool) then | |
26bff3d9 | 3180 | if VM_Target = No_VM then |
70482933 RK |
3181 | Set_Procedure_To_Call (N, RTE (RE_SS_Allocate)); |
3182 | end if; | |
fbf5a39b AC |
3183 | |
3184 | elsif Is_Class_Wide_Type (Etype (Storage_Pool (N))) then | |
3185 | Set_Procedure_To_Call (N, RTE (RE_Allocate_Any)); | |
3186 | ||
70482933 RK |
3187 | else |
3188 | Set_Procedure_To_Call (N, | |
3189 | Find_Prim_Op (Etype (Storage_Pool (N)), Name_Allocate)); | |
3190 | end if; | |
3191 | end if; | |
3192 | ||
685094bf RD |
3193 | -- Under certain circumstances we can replace an allocator by an access |
3194 | -- to statically allocated storage. The conditions, as noted in AARM | |
3195 | -- 3.10 (10c) are as follows: | |
70482933 RK |
3196 | |
3197 | -- Size and initial value is known at compile time | |
3198 | -- Access type is access-to-constant | |
3199 | ||
fbf5a39b AC |
3200 | -- The allocator is not part of a constraint on a record component, |
3201 | -- because in that case the inserted actions are delayed until the | |
3202 | -- record declaration is fully analyzed, which is too late for the | |
3203 | -- analysis of the rewritten allocator. | |
3204 | ||
70482933 RK |
3205 | if Is_Access_Constant (PtrT) |
3206 | and then Nkind (Expression (N)) = N_Qualified_Expression | |
3207 | and then Compile_Time_Known_Value (Expression (Expression (N))) | |
3208 | and then Size_Known_At_Compile_Time (Etype (Expression | |
3209 | (Expression (N)))) | |
fbf5a39b | 3210 | and then not Is_Record_Type (Current_Scope) |
70482933 RK |
3211 | then |
3212 | -- Here we can do the optimization. For the allocator | |
3213 | ||
3214 | -- new x'(y) | |
3215 | ||
3216 | -- We insert an object declaration | |
3217 | ||
3218 | -- Tnn : aliased x := y; | |
3219 | ||
685094bf RD |
3220 | -- and replace the allocator by Tnn'Unrestricted_Access. Tnn is |
3221 | -- marked as requiring static allocation. | |
70482933 RK |
3222 | |
3223 | Temp := | |
3224 | Make_Defining_Identifier (Loc, New_Internal_Name ('T')); | |
3225 | ||
3226 | Desig := Subtype_Mark (Expression (N)); | |
3227 | ||
3228 | -- If context is constrained, use constrained subtype directly, | |
8fc789c8 | 3229 | -- so that the constant is not labelled as having a nominally |
70482933 RK |
3230 | -- unconstrained subtype. |
3231 | ||
0da2c8ac AC |
3232 | if Entity (Desig) = Base_Type (Dtyp) then |
3233 | Desig := New_Occurrence_Of (Dtyp, Loc); | |
70482933 RK |
3234 | end if; |
3235 | ||
3236 | Insert_Action (N, | |
3237 | Make_Object_Declaration (Loc, | |
3238 | Defining_Identifier => Temp, | |
3239 | Aliased_Present => True, | |
3240 | Constant_Present => Is_Access_Constant (PtrT), | |
3241 | Object_Definition => Desig, | |
3242 | Expression => Expression (Expression (N)))); | |
3243 | ||
3244 | Rewrite (N, | |
3245 | Make_Attribute_Reference (Loc, | |
3246 | Prefix => New_Occurrence_Of (Temp, Loc), | |
3247 | Attribute_Name => Name_Unrestricted_Access)); | |
3248 | ||
3249 | Analyze_And_Resolve (N, PtrT); | |
3250 | ||
685094bf RD |
3251 | -- We set the variable as statically allocated, since we don't want |
3252 | -- it going on the stack of the current procedure! | |
70482933 RK |
3253 | |
3254 | Set_Is_Statically_Allocated (Temp); | |
3255 | return; | |
3256 | end if; | |
3257 | ||
0669bebe GB |
3258 | -- Same if the allocator is an access discriminant for a local object: |
3259 | -- instead of an allocator we create a local value and constrain the | |
3260 | -- the enclosing object with the corresponding access attribute. | |
3261 | ||
26bff3d9 JM |
3262 | if Is_Static_Coextension (N) then |
3263 | Rewrite_Coextension (N); | |
0669bebe GB |
3264 | return; |
3265 | end if; | |
3266 | ||
26bff3d9 JM |
3267 | -- The current allocator creates an object which may contain nested |
3268 | -- coextensions. Use the current allocator's finalization list to | |
3269 | -- generate finalization call for all nested coextensions. | |
3270 | ||
3271 | if Is_Coextension_Root (N) then | |
3272 | Complete_Coextension_Finalization; | |
3273 | end if; | |
3274 | ||
0da2c8ac AC |
3275 | -- Handle case of qualified expression (other than optimization above) |
3276 | ||
70482933 | 3277 | if Nkind (Expression (N)) = N_Qualified_Expression then |
fbf5a39b | 3278 | Expand_Allocator_Expression (N); |
26bff3d9 JM |
3279 | return; |
3280 | end if; | |
fbf5a39b | 3281 | |
26bff3d9 JM |
3282 | -- If the allocator is for a type which requires initialization, and |
3283 | -- there is no initial value (i.e. operand is a subtype indication | |
685094bf RD |
3284 | -- rather than a qualified expression), then we must generate a call to |
3285 | -- the initialization routine using an expressions action node: | |
70482933 | 3286 | |
26bff3d9 | 3287 | -- [Pnnn : constant ptr_T := new (T); Init (Pnnn.all,...); Pnnn] |
70482933 | 3288 | |
26bff3d9 JM |
3289 | -- Here ptr_T is the pointer type for the allocator, and T is the |
3290 | -- subtype of the allocator. A special case arises if the designated | |
3291 | -- type of the access type is a task or contains tasks. In this case | |
3292 | -- the call to Init (Temp.all ...) is replaced by code that ensures | |
3293 | -- that tasks get activated (see Exp_Ch9.Build_Task_Allocate_Block | |
3294 | -- for details). In addition, if the type T is a task T, then the | |
3295 | -- first argument to Init must be converted to the task record type. | |
70482933 | 3296 | |
26bff3d9 JM |
3297 | declare |
3298 | T : constant Entity_Id := Entity (Expression (N)); | |
3299 | Init : Entity_Id; | |
3300 | Arg1 : Node_Id; | |
3301 | Args : List_Id; | |
3302 | Decls : List_Id; | |
3303 | Decl : Node_Id; | |
3304 | Discr : Elmt_Id; | |
3305 | Flist : Node_Id; | |
3306 | Temp_Decl : Node_Id; | |
3307 | Temp_Type : Entity_Id; | |
3308 | Attach_Level : Uint; | |
70482933 | 3309 | |
26bff3d9 JM |
3310 | begin |
3311 | if No_Initialization (N) then | |
3312 | null; | |
70482933 | 3313 | |
26bff3d9 | 3314 | -- Case of no initialization procedure present |
70482933 | 3315 | |
26bff3d9 | 3316 | elsif not Has_Non_Null_Base_Init_Proc (T) then |
70482933 | 3317 | |
26bff3d9 | 3318 | -- Case of simple initialization required |
70482933 | 3319 | |
26bff3d9 | 3320 | if Needs_Simple_Initialization (T) then |
b4592168 | 3321 | Check_Restriction (No_Default_Initialization, N); |
26bff3d9 JM |
3322 | Rewrite (Expression (N), |
3323 | Make_Qualified_Expression (Loc, | |
3324 | Subtype_Mark => New_Occurrence_Of (T, Loc), | |
b4592168 | 3325 | Expression => Get_Simple_Init_Val (T, N))); |
70482933 | 3326 | |
26bff3d9 JM |
3327 | Analyze_And_Resolve (Expression (Expression (N)), T); |
3328 | Analyze_And_Resolve (Expression (N), T); | |
3329 | Set_Paren_Count (Expression (Expression (N)), 1); | |
3330 | Expand_N_Allocator (N); | |
70482933 | 3331 | |
26bff3d9 | 3332 | -- No initialization required |
70482933 RK |
3333 | |
3334 | else | |
26bff3d9 JM |
3335 | null; |
3336 | end if; | |
70482933 | 3337 | |
26bff3d9 | 3338 | -- Case of initialization procedure present, must be called |
70482933 | 3339 | |
26bff3d9 | 3340 | else |
b4592168 | 3341 | Check_Restriction (No_Default_Initialization, N); |
70482933 | 3342 | |
b4592168 GD |
3343 | if not Restriction_Active (No_Default_Initialization) then |
3344 | Init := Base_Init_Proc (T); | |
3345 | Nod := N; | |
3346 | Temp := Make_Defining_Identifier (Loc, New_Internal_Name ('P')); | |
70482933 | 3347 | |
b4592168 | 3348 | -- Construct argument list for the initialization routine call |
70482933 | 3349 | |
26bff3d9 | 3350 | Arg1 := |
b4592168 GD |
3351 | Make_Explicit_Dereference (Loc, |
3352 | Prefix => New_Reference_To (Temp, Loc)); | |
3353 | Set_Assignment_OK (Arg1); | |
3354 | Temp_Type := PtrT; | |
26bff3d9 | 3355 | |
b4592168 GD |
3356 | -- The initialization procedure expects a specific type. if the |
3357 | -- context is access to class wide, indicate that the object | |
3358 | -- being allocated has the right specific type. | |
70482933 | 3359 | |
b4592168 GD |
3360 | if Is_Class_Wide_Type (Dtyp) then |
3361 | Arg1 := Unchecked_Convert_To (T, Arg1); | |
3362 | end if; | |
70482933 | 3363 | |
b4592168 GD |
3364 | -- If designated type is a concurrent type or if it is private |
3365 | -- type whose definition is a concurrent type, the first | |
3366 | -- argument in the Init routine has to be unchecked conversion | |
3367 | -- to the corresponding record type. If the designated type is | |
3368 | -- a derived type, we also convert the argument to its root | |
3369 | -- type. | |
20b5d666 | 3370 | |
b4592168 GD |
3371 | if Is_Concurrent_Type (T) then |
3372 | Arg1 := | |
3373 | Unchecked_Convert_To (Corresponding_Record_Type (T), Arg1); | |
70482933 | 3374 | |
b4592168 GD |
3375 | elsif Is_Private_Type (T) |
3376 | and then Present (Full_View (T)) | |
3377 | and then Is_Concurrent_Type (Full_View (T)) | |
3378 | then | |
3379 | Arg1 := | |
3380 | Unchecked_Convert_To | |
3381 | (Corresponding_Record_Type (Full_View (T)), Arg1); | |
70482933 | 3382 | |
b4592168 GD |
3383 | elsif Etype (First_Formal (Init)) /= Base_Type (T) then |
3384 | declare | |
3385 | Ftyp : constant Entity_Id := Etype (First_Formal (Init)); | |
3386 | begin | |
3387 | Arg1 := OK_Convert_To (Etype (Ftyp), Arg1); | |
3388 | Set_Etype (Arg1, Ftyp); | |
3389 | end; | |
3390 | end if; | |
70482933 | 3391 | |
b4592168 | 3392 | Args := New_List (Arg1); |
70482933 | 3393 | |
b4592168 GD |
3394 | -- For the task case, pass the Master_Id of the access type as |
3395 | -- the value of the _Master parameter, and _Chain as the value | |
3396 | -- of the _Chain parameter (_Chain will be defined as part of | |
3397 | -- the generated code for the allocator). | |
70482933 | 3398 | |
b4592168 GD |
3399 | -- In Ada 2005, the context may be a function that returns an |
3400 | -- anonymous access type. In that case the Master_Id has been | |
3401 | -- created when expanding the function declaration. | |
70482933 | 3402 | |
b4592168 GD |
3403 | if Has_Task (T) then |
3404 | if No (Master_Id (Base_Type (PtrT))) then | |
70482933 | 3405 | |
b4592168 GD |
3406 | -- If we have a non-library level task with restriction |
3407 | -- No_Task_Hierarchy set, then no point in expanding. | |
70482933 | 3408 | |
b4592168 GD |
3409 | if not Is_Library_Level_Entity (T) |
3410 | and then Restriction_Active (No_Task_Hierarchy) | |
26bff3d9 | 3411 | then |
b4592168 | 3412 | return; |
26bff3d9 | 3413 | end if; |
70482933 | 3414 | |
b4592168 GD |
3415 | -- The designated type was an incomplete type, and the |
3416 | -- access type did not get expanded. Salvage it now. | |
70482933 | 3417 | |
b4592168 GD |
3418 | pragma Assert (Present (Parent (Base_Type (PtrT)))); |
3419 | Expand_N_Full_Type_Declaration | |
3420 | (Parent (Base_Type (PtrT))); | |
3421 | end if; | |
70482933 | 3422 | |
b4592168 GD |
3423 | -- If the context of the allocator is a declaration or an |
3424 | -- assignment, we can generate a meaningful image for it, | |
3425 | -- even though subsequent assignments might remove the | |
3426 | -- connection between task and entity. We build this image | |
3427 | -- when the left-hand side is a simple variable, a simple | |
3428 | -- indexed assignment or a simple selected component. | |
3429 | ||
3430 | if Nkind (Parent (N)) = N_Assignment_Statement then | |
3431 | declare | |
3432 | Nam : constant Node_Id := Name (Parent (N)); | |
3433 | ||
3434 | begin | |
3435 | if Is_Entity_Name (Nam) then | |
3436 | Decls := | |
3437 | Build_Task_Image_Decls | |
3438 | (Loc, | |
3439 | New_Occurrence_Of | |
3440 | (Entity (Nam), Sloc (Nam)), T); | |
3441 | ||
3442 | elsif Nkind_In | |
3443 | (Nam, N_Indexed_Component, N_Selected_Component) | |
3444 | and then Is_Entity_Name (Prefix (Nam)) | |
3445 | then | |
3446 | Decls := | |
3447 | Build_Task_Image_Decls | |
3448 | (Loc, Nam, Etype (Prefix (Nam))); | |
3449 | else | |
3450 | Decls := Build_Task_Image_Decls (Loc, T, T); | |
3451 | end if; | |
3452 | end; | |
70482933 | 3453 | |
b4592168 GD |
3454 | elsif Nkind (Parent (N)) = N_Object_Declaration then |
3455 | Decls := | |
3456 | Build_Task_Image_Decls | |
3457 | (Loc, Defining_Identifier (Parent (N)), T); | |
70482933 | 3458 | |
b4592168 GD |
3459 | else |
3460 | Decls := Build_Task_Image_Decls (Loc, T, T); | |
3461 | end if; | |
26bff3d9 | 3462 | |
b4592168 GD |
3463 | Append_To (Args, |
3464 | New_Reference_To | |
3465 | (Master_Id (Base_Type (Root_Type (PtrT))), Loc)); | |
3466 | Append_To (Args, Make_Identifier (Loc, Name_uChain)); | |
26bff3d9 | 3467 | |
b4592168 GD |
3468 | Decl := Last (Decls); |
3469 | Append_To (Args, | |
3470 | New_Occurrence_Of (Defining_Identifier (Decl), Loc)); | |
26bff3d9 | 3471 | |
b4592168 | 3472 | -- Has_Task is false, Decls not used |
26bff3d9 | 3473 | |
b4592168 GD |
3474 | else |
3475 | Decls := No_List; | |
26bff3d9 JM |
3476 | end if; |
3477 | ||
b4592168 GD |
3478 | -- Add discriminants if discriminated type |
3479 | ||
3480 | declare | |
3481 | Dis : Boolean := False; | |
3482 | Typ : Entity_Id; | |
3483 | ||
3484 | begin | |
3485 | if Has_Discriminants (T) then | |
3486 | Dis := True; | |
3487 | Typ := T; | |
3488 | ||
3489 | elsif Is_Private_Type (T) | |
3490 | and then Present (Full_View (T)) | |
3491 | and then Has_Discriminants (Full_View (T)) | |
20b5d666 | 3492 | then |
b4592168 GD |
3493 | Dis := True; |
3494 | Typ := Full_View (T); | |
20b5d666 | 3495 | end if; |
70482933 | 3496 | |
b4592168 | 3497 | if Dis then |
26bff3d9 | 3498 | |
b4592168 | 3499 | -- If the allocated object will be constrained by the |
685094bf RD |
3500 | -- default values for discriminants, then build a subtype |
3501 | -- with those defaults, and change the allocated subtype | |
3502 | -- to that. Note that this happens in fewer cases in Ada | |
3503 | -- 2005 (AI-363). | |
26bff3d9 | 3504 | |
b4592168 GD |
3505 | if not Is_Constrained (Typ) |
3506 | and then Present (Discriminant_Default_Value | |
3507 | (First_Discriminant (Typ))) | |
3508 | and then (Ada_Version < Ada_05 | |
3509 | or else | |
3510 | not Has_Constrained_Partial_View (Typ)) | |
20b5d666 | 3511 | then |
b4592168 GD |
3512 | Typ := Build_Default_Subtype (Typ, N); |
3513 | Set_Expression (N, New_Reference_To (Typ, Loc)); | |
20b5d666 JM |
3514 | end if; |
3515 | ||
b4592168 GD |
3516 | Discr := First_Elmt (Discriminant_Constraint (Typ)); |
3517 | while Present (Discr) loop | |
3518 | Nod := Node (Discr); | |
3519 | Append (New_Copy_Tree (Node (Discr)), Args); | |
20b5d666 | 3520 | |
b4592168 GD |
3521 | -- AI-416: when the discriminant constraint is an |
3522 | -- anonymous access type make sure an accessibility | |
3523 | -- check is inserted if necessary (3.10.2(22.q/2)) | |
20b5d666 | 3524 | |
b4592168 GD |
3525 | if Ada_Version >= Ada_05 |
3526 | and then | |
3527 | Ekind (Etype (Nod)) = E_Anonymous_Access_Type | |
3528 | then | |
e84e11ba GD |
3529 | Apply_Accessibility_Check |
3530 | (Nod, Typ, Insert_Node => Nod); | |
b4592168 | 3531 | end if; |
20b5d666 | 3532 | |
b4592168 GD |
3533 | Next_Elmt (Discr); |
3534 | end loop; | |
3535 | end if; | |
3536 | end; | |
70482933 | 3537 | |
b4592168 GD |
3538 | -- We set the allocator as analyzed so that when we analyze the |
3539 | -- expression actions node, we do not get an unwanted recursive | |
3540 | -- expansion of the allocator expression. | |
70482933 | 3541 | |
b4592168 GD |
3542 | Set_Analyzed (N, True); |
3543 | Nod := Relocate_Node (N); | |
70482933 | 3544 | |
b4592168 GD |
3545 | -- Here is the transformation: |
3546 | -- input: new T | |
3547 | -- output: Temp : constant ptr_T := new T; | |
3548 | -- Init (Temp.all, ...); | |
3549 | -- <CTRL> Attach_To_Final_List (Finalizable (Temp.all)); | |
3550 | -- <CTRL> Initialize (Finalizable (Temp.all)); | |
70482933 | 3551 | |
b4592168 GD |
3552 | -- Here ptr_T is the pointer type for the allocator, and is the |
3553 | -- subtype of the allocator. | |
70482933 | 3554 | |
b4592168 GD |
3555 | Temp_Decl := |
3556 | Make_Object_Declaration (Loc, | |
3557 | Defining_Identifier => Temp, | |
3558 | Constant_Present => True, | |
3559 | Object_Definition => New_Reference_To (Temp_Type, Loc), | |
3560 | Expression => Nod); | |
70482933 | 3561 | |
b4592168 GD |
3562 | Set_Assignment_OK (Temp_Decl); |
3563 | Insert_Action (N, Temp_Decl, Suppress => All_Checks); | |
70482933 | 3564 | |
b4592168 GD |
3565 | -- If the designated type is a task type or contains tasks, |
3566 | -- create block to activate created tasks, and insert | |
3567 | -- declaration for Task_Image variable ahead of call. | |
70482933 | 3568 | |
b4592168 GD |
3569 | if Has_Task (T) then |
3570 | declare | |
3571 | L : constant List_Id := New_List; | |
3572 | Blk : Node_Id; | |
3573 | begin | |
3574 | Build_Task_Allocate_Block (L, Nod, Args); | |
3575 | Blk := Last (L); | |
3576 | Insert_List_Before (First (Declarations (Blk)), Decls); | |
3577 | Insert_Actions (N, L); | |
3578 | end; | |
70482933 | 3579 | |
b4592168 GD |
3580 | else |
3581 | Insert_Action (N, | |
3582 | Make_Procedure_Call_Statement (Loc, | |
3583 | Name => New_Reference_To (Init, Loc), | |
3584 | Parameter_Associations => Args)); | |
3585 | end if; | |
70482933 | 3586 | |
048e5cef | 3587 | if Needs_Finalization (T) then |
70482933 | 3588 | |
b4592168 GD |
3589 | -- Postpone the generation of a finalization call for the |
3590 | -- current allocator if it acts as a coextension. | |
26bff3d9 | 3591 | |
b4592168 GD |
3592 | if Is_Dynamic_Coextension (N) then |
3593 | if No (Coextensions (N)) then | |
3594 | Set_Coextensions (N, New_Elmt_List); | |
3595 | end if; | |
70482933 | 3596 | |
b4592168 GD |
3597 | Append_Elmt (New_Copy_Tree (Arg1), Coextensions (N)); |
3598 | ||
3599 | else | |
3600 | Flist := | |
3601 | Get_Allocator_Final_List (N, Base_Type (T), PtrT); | |
0669bebe | 3602 | |
b4592168 GD |
3603 | -- Anonymous access types created for access parameters |
3604 | -- are attached to an explicitly constructed controller, | |
3605 | -- which ensures that they can be finalized properly, | |
3606 | -- even if their deallocation might not happen. The list | |
3607 | -- associated with the controller is doubly-linked. For | |
3608 | -- other anonymous access types, the object may end up | |
3609 | -- on the global final list which is singly-linked. | |
3610 | -- Work needed for access discriminants in Ada 2005 ??? | |
0669bebe | 3611 | |
b4592168 | 3612 | if Ekind (PtrT) = E_Anonymous_Access_Type |
26bff3d9 JM |
3613 | and then |
3614 | Nkind (Associated_Node_For_Itype (PtrT)) | |
b4592168 GD |
3615 | not in N_Subprogram_Specification |
3616 | then | |
3617 | Attach_Level := Uint_1; | |
3618 | else | |
3619 | Attach_Level := Uint_2; | |
3620 | end if; | |
0669bebe | 3621 | |
b4592168 GD |
3622 | Insert_Actions (N, |
3623 | Make_Init_Call ( | |
3624 | Ref => New_Copy_Tree (Arg1), | |
3625 | Typ => T, | |
3626 | Flist_Ref => Flist, | |
3627 | With_Attach => Make_Integer_Literal (Loc, | |
3628 | Intval => Attach_Level))); | |
3629 | end if; | |
70482933 RK |
3630 | end if; |
3631 | ||
b4592168 GD |
3632 | Rewrite (N, New_Reference_To (Temp, Loc)); |
3633 | Analyze_And_Resolve (N, PtrT); | |
3634 | end if; | |
26bff3d9 JM |
3635 | end if; |
3636 | end; | |
f82944b7 | 3637 | |
26bff3d9 JM |
3638 | -- Ada 2005 (AI-251): If the allocator is for a class-wide interface |
3639 | -- object that has been rewritten as a reference, we displace "this" | |
3640 | -- to reference properly its secondary dispatch table. | |
3641 | ||
3642 | if Nkind (N) = N_Identifier | |
f82944b7 JM |
3643 | and then Is_Interface (Dtyp) |
3644 | then | |
26bff3d9 | 3645 | Displace_Allocator_Pointer (N); |
f82944b7 JM |
3646 | end if; |
3647 | ||
fbf5a39b AC |
3648 | exception |
3649 | when RE_Not_Available => | |
3650 | return; | |
70482933 RK |
3651 | end Expand_N_Allocator; |
3652 | ||
3653 | ----------------------- | |
3654 | -- Expand_N_And_Then -- | |
3655 | ----------------------- | |
3656 | ||
20b5d666 JM |
3657 | -- Expand into conditional expression if Actions present, and also deal |
3658 | -- with optimizing case of arguments being True or False. | |
70482933 RK |
3659 | |
3660 | procedure Expand_N_And_Then (N : Node_Id) is | |
3661 | Loc : constant Source_Ptr := Sloc (N); | |
3662 | Typ : constant Entity_Id := Etype (N); | |
3663 | Left : constant Node_Id := Left_Opnd (N); | |
3664 | Right : constant Node_Id := Right_Opnd (N); | |
3665 | Actlist : List_Id; | |
3666 | ||
3667 | begin | |
3668 | -- Deal with non-standard booleans | |
3669 | ||
3670 | if Is_Boolean_Type (Typ) then | |
3671 | Adjust_Condition (Left); | |
3672 | Adjust_Condition (Right); | |
3673 | Set_Etype (N, Standard_Boolean); | |
3674 | end if; | |
3675 | ||
deff3e5e | 3676 | -- Check for cases where left argument is known to be True or False |
70482933 | 3677 | |
deff3e5e | 3678 | if Compile_Time_Known_Value (Left) then |
70482933 RK |
3679 | |
3680 | -- If left argument is True, change (True and then Right) to Right. | |
3681 | -- Any actions associated with Right will be executed unconditionally | |
3682 | -- and can thus be inserted into the tree unconditionally. | |
3683 | ||
deff3e5e | 3684 | if Expr_Value_E (Left) = Standard_True then |
70482933 RK |
3685 | if Present (Actions (N)) then |
3686 | Insert_Actions (N, Actions (N)); | |
3687 | end if; | |
3688 | ||
3689 | Rewrite (N, Right); | |
70482933 | 3690 | |
20b5d666 JM |
3691 | -- If left argument is False, change (False and then Right) to False. |
3692 | -- In this case we can forget the actions associated with Right, | |
3693 | -- since they will never be executed. | |
70482933 | 3694 | |
deff3e5e | 3695 | else pragma Assert (Expr_Value_E (Left) = Standard_False); |
70482933 RK |
3696 | Kill_Dead_Code (Right); |
3697 | Kill_Dead_Code (Actions (N)); | |
3698 | Rewrite (N, New_Occurrence_Of (Standard_False, Loc)); | |
70482933 | 3699 | end if; |
deff3e5e BD |
3700 | |
3701 | Adjust_Result_Type (N, Typ); | |
3702 | return; | |
70482933 RK |
3703 | end if; |
3704 | ||
3705 | -- If Actions are present, we expand | |
3706 | ||
3707 | -- left and then right | |
3708 | ||
3709 | -- into | |
3710 | ||
3711 | -- if left then right else false end | |
3712 | ||
3713 | -- with the actions becoming the Then_Actions of the conditional | |
3714 | -- expression. This conditional expression is then further expanded | |
3715 | -- (and will eventually disappear) | |
3716 | ||
3717 | if Present (Actions (N)) then | |
3718 | Actlist := Actions (N); | |
3719 | Rewrite (N, | |
3720 | Make_Conditional_Expression (Loc, | |
3721 | Expressions => New_List ( | |
3722 | Left, | |
3723 | Right, | |
3724 | New_Occurrence_Of (Standard_False, Loc)))); | |
3725 | ||
3726 | Set_Then_Actions (N, Actlist); | |
3727 | Analyze_And_Resolve (N, Standard_Boolean); | |
3728 | Adjust_Result_Type (N, Typ); | |
3729 | return; | |
3730 | end if; | |
3731 | ||
3732 | -- No actions present, check for cases of right argument True/False | |
3733 | ||
deff3e5e | 3734 | if Compile_Time_Known_Value (Right) then |
70482933 | 3735 | |
685094bf RD |
3736 | -- Change (Left and then True) to Left. Note that we know there are |
3737 | -- no actions associated with the True operand, since we just checked | |
3738 | -- for this case above. | |
70482933 | 3739 | |
deff3e5e | 3740 | if Expr_Value_E (Right) = Standard_True then |
70482933 RK |
3741 | Rewrite (N, Left); |
3742 | ||
685094bf RD |
3743 | -- Change (Left and then False) to False, making sure to preserve any |
3744 | -- side effects associated with the Left operand. | |
70482933 | 3745 | |
deff3e5e | 3746 | else pragma Assert (Expr_Value_E (Right) = Standard_False); |
70482933 RK |
3747 | Remove_Side_Effects (Left); |
3748 | Rewrite | |
3749 | (N, New_Occurrence_Of (Standard_False, Loc)); | |
3750 | end if; | |
3751 | end if; | |
3752 | ||
3753 | Adjust_Result_Type (N, Typ); | |
3754 | end Expand_N_And_Then; | |
3755 | ||
3756 | ------------------------------------- | |
3757 | -- Expand_N_Conditional_Expression -- | |
3758 | ------------------------------------- | |
3759 | ||
3760 | -- Expand into expression actions if then/else actions present | |
3761 | ||
3762 | procedure Expand_N_Conditional_Expression (N : Node_Id) is | |
3763 | Loc : constant Source_Ptr := Sloc (N); | |
3764 | Cond : constant Node_Id := First (Expressions (N)); | |
3765 | Thenx : constant Node_Id := Next (Cond); | |
3766 | Elsex : constant Node_Id := Next (Thenx); | |
3767 | Typ : constant Entity_Id := Etype (N); | |
3768 | Cnn : Entity_Id; | |
3769 | New_If : Node_Id; | |
3770 | ||
3771 | begin | |
3772 | -- If either then or else actions are present, then given: | |
3773 | ||
3774 | -- if cond then then-expr else else-expr end | |
3775 | ||
3776 | -- we insert the following sequence of actions (using Insert_Actions): | |
3777 | ||
3778 | -- Cnn : typ; | |
3779 | -- if cond then | |
3780 | -- <<then actions>> | |
3781 | -- Cnn := then-expr; | |
3782 | -- else | |
3783 | -- <<else actions>> | |
3784 | -- Cnn := else-expr | |
3785 | -- end if; | |
3786 | ||
2717634d | 3787 | -- and replace the conditional expression by a reference to Cnn |
70482933 RK |
3788 | |
3789 | if Present (Then_Actions (N)) or else Present (Else_Actions (N)) then | |
3790 | Cnn := Make_Defining_Identifier (Loc, New_Internal_Name ('C')); | |
3791 | ||
3792 | New_If := | |
3793 | Make_Implicit_If_Statement (N, | |
3794 | Condition => Relocate_Node (Cond), | |
3795 | ||
3796 | Then_Statements => New_List ( | |
3797 | Make_Assignment_Statement (Sloc (Thenx), | |
3798 | Name => New_Occurrence_Of (Cnn, Sloc (Thenx)), | |
3799 | Expression => Relocate_Node (Thenx))), | |
3800 | ||
3801 | Else_Statements => New_List ( | |
3802 | Make_Assignment_Statement (Sloc (Elsex), | |
3803 | Name => New_Occurrence_Of (Cnn, Sloc (Elsex)), | |
3804 | Expression => Relocate_Node (Elsex)))); | |
3805 | ||
fbf5a39b AC |
3806 | Set_Assignment_OK (Name (First (Then_Statements (New_If)))); |
3807 | Set_Assignment_OK (Name (First (Else_Statements (New_If)))); | |
3808 | ||
70482933 RK |
3809 | if Present (Then_Actions (N)) then |
3810 | Insert_List_Before | |
3811 | (First (Then_Statements (New_If)), Then_Actions (N)); | |
3812 | end if; | |
3813 | ||
3814 | if Present (Else_Actions (N)) then | |
3815 | Insert_List_Before | |
3816 | (First (Else_Statements (New_If)), Else_Actions (N)); | |
3817 | end if; | |
3818 | ||
3819 | Rewrite (N, New_Occurrence_Of (Cnn, Loc)); | |
3820 | ||
3821 | Insert_Action (N, | |
3822 | Make_Object_Declaration (Loc, | |
3823 | Defining_Identifier => Cnn, | |
3824 | Object_Definition => New_Occurrence_Of (Typ, Loc))); | |
3825 | ||
3826 | Insert_Action (N, New_If); | |
3827 | Analyze_And_Resolve (N, Typ); | |
3828 | end if; | |
3829 | end Expand_N_Conditional_Expression; | |
3830 | ||
3831 | ----------------------------------- | |
3832 | -- Expand_N_Explicit_Dereference -- | |
3833 | ----------------------------------- | |
3834 | ||
3835 | procedure Expand_N_Explicit_Dereference (N : Node_Id) is | |
3836 | begin | |
dfd99a80 | 3837 | -- Insert explicit dereference call for the checked storage pool case |
70482933 RK |
3838 | |
3839 | Insert_Dereference_Action (Prefix (N)); | |
3840 | end Expand_N_Explicit_Dereference; | |
3841 | ||
3842 | ----------------- | |
3843 | -- Expand_N_In -- | |
3844 | ----------------- | |
3845 | ||
3846 | procedure Expand_N_In (N : Node_Id) is | |
7324bf49 AC |
3847 | Loc : constant Source_Ptr := Sloc (N); |
3848 | Rtyp : constant Entity_Id := Etype (N); | |
3849 | Lop : constant Node_Id := Left_Opnd (N); | |
3850 | Rop : constant Node_Id := Right_Opnd (N); | |
3851 | Static : constant Boolean := Is_OK_Static_Expression (N); | |
70482933 | 3852 | |
630d30e9 RD |
3853 | procedure Substitute_Valid_Check; |
3854 | -- Replaces node N by Lop'Valid. This is done when we have an explicit | |
3855 | -- test for the left operand being in range of its subtype. | |
3856 | ||
3857 | ---------------------------- | |
3858 | -- Substitute_Valid_Check -- | |
3859 | ---------------------------- | |
3860 | ||
3861 | procedure Substitute_Valid_Check is | |
3862 | begin | |
3863 | Rewrite (N, | |
3864 | Make_Attribute_Reference (Loc, | |
3865 | Prefix => Relocate_Node (Lop), | |
3866 | Attribute_Name => Name_Valid)); | |
3867 | ||
3868 | Analyze_And_Resolve (N, Rtyp); | |
3869 | ||
3870 | Error_Msg_N ("?explicit membership test may be optimized away", N); | |
3871 | Error_Msg_N ("\?use ''Valid attribute instead", N); | |
3872 | return; | |
3873 | end Substitute_Valid_Check; | |
3874 | ||
3875 | -- Start of processing for Expand_N_In | |
3876 | ||
70482933 | 3877 | begin |
630d30e9 RD |
3878 | -- Check case of explicit test for an expression in range of its |
3879 | -- subtype. This is suspicious usage and we replace it with a 'Valid | |
3880 | -- test and give a warning. | |
3881 | ||
3882 | if Is_Scalar_Type (Etype (Lop)) | |
3883 | and then Nkind (Rop) in N_Has_Entity | |
3884 | and then Etype (Lop) = Entity (Rop) | |
3885 | and then Comes_From_Source (N) | |
26bff3d9 | 3886 | and then VM_Target = No_VM |
630d30e9 RD |
3887 | then |
3888 | Substitute_Valid_Check; | |
3889 | return; | |
3890 | end if; | |
3891 | ||
20b5d666 JM |
3892 | -- Do validity check on operands |
3893 | ||
3894 | if Validity_Checks_On and Validity_Check_Operands then | |
3895 | Ensure_Valid (Left_Opnd (N)); | |
3896 | Validity_Check_Range (Right_Opnd (N)); | |
3897 | end if; | |
3898 | ||
630d30e9 | 3899 | -- Case of explicit range |
fbf5a39b AC |
3900 | |
3901 | if Nkind (Rop) = N_Range then | |
3902 | declare | |
630d30e9 RD |
3903 | Lo : constant Node_Id := Low_Bound (Rop); |
3904 | Hi : constant Node_Id := High_Bound (Rop); | |
3905 | ||
d766cee3 RD |
3906 | Ltyp : constant Entity_Id := Etype (Lop); |
3907 | ||
630d30e9 RD |
3908 | Lo_Orig : constant Node_Id := Original_Node (Lo); |
3909 | Hi_Orig : constant Node_Id := Original_Node (Hi); | |
3910 | ||
c800f862 RD |
3911 | Lcheck : Compare_Result; |
3912 | Ucheck : Compare_Result; | |
fbf5a39b | 3913 | |
d766cee3 RD |
3914 | Warn1 : constant Boolean := |
3915 | Constant_Condition_Warnings | |
c800f862 RD |
3916 | and then Comes_From_Source (N) |
3917 | and then not In_Instance; | |
d766cee3 RD |
3918 | -- This must be true for any of the optimization warnings, we |
3919 | -- clearly want to give them only for source with the flag on. | |
c800f862 RD |
3920 | -- We also skip these warnings in an instance since it may be |
3921 | -- the case that different instantiations have different ranges. | |
d766cee3 RD |
3922 | |
3923 | Warn2 : constant Boolean := | |
3924 | Warn1 | |
3925 | and then Nkind (Original_Node (Rop)) = N_Range | |
3926 | and then Is_Integer_Type (Etype (Lo)); | |
3927 | -- For the case where only one bound warning is elided, we also | |
3928 | -- insist on an explicit range and an integer type. The reason is | |
3929 | -- that the use of enumeration ranges including an end point is | |
3930 | -- common, as is the use of a subtype name, one of whose bounds | |
3931 | -- is the same as the type of the expression. | |
3932 | ||
fbf5a39b | 3933 | begin |
630d30e9 RD |
3934 | -- If test is explicit x'first .. x'last, replace by valid check |
3935 | ||
d766cee3 | 3936 | if Is_Scalar_Type (Ltyp) |
630d30e9 RD |
3937 | and then Nkind (Lo_Orig) = N_Attribute_Reference |
3938 | and then Attribute_Name (Lo_Orig) = Name_First | |
3939 | and then Nkind (Prefix (Lo_Orig)) in N_Has_Entity | |
d766cee3 | 3940 | and then Entity (Prefix (Lo_Orig)) = Ltyp |
630d30e9 RD |
3941 | and then Nkind (Hi_Orig) = N_Attribute_Reference |
3942 | and then Attribute_Name (Hi_Orig) = Name_Last | |
3943 | and then Nkind (Prefix (Hi_Orig)) in N_Has_Entity | |
d766cee3 | 3944 | and then Entity (Prefix (Hi_Orig)) = Ltyp |
630d30e9 | 3945 | and then Comes_From_Source (N) |
26bff3d9 | 3946 | and then VM_Target = No_VM |
630d30e9 RD |
3947 | then |
3948 | Substitute_Valid_Check; | |
3949 | return; | |
3950 | end if; | |
3951 | ||
d766cee3 RD |
3952 | -- If bounds of type are known at compile time, and the end points |
3953 | -- are known at compile time and identical, this is another case | |
3954 | -- for substituting a valid test. We only do this for discrete | |
3955 | -- types, since it won't arise in practice for float types. | |
3956 | ||
3957 | if Comes_From_Source (N) | |
3958 | and then Is_Discrete_Type (Ltyp) | |
3959 | and then Compile_Time_Known_Value (Type_High_Bound (Ltyp)) | |
3960 | and then Compile_Time_Known_Value (Type_Low_Bound (Ltyp)) | |
3961 | and then Compile_Time_Known_Value (Lo) | |
3962 | and then Compile_Time_Known_Value (Hi) | |
3963 | and then Expr_Value (Type_High_Bound (Ltyp)) = Expr_Value (Hi) | |
3964 | and then Expr_Value (Type_Low_Bound (Ltyp)) = Expr_Value (Lo) | |
94eefd2e RD |
3965 | |
3966 | -- Kill warnings in instances, since they may be cases where we | |
3967 | -- have a test in the generic that makes sense with some types | |
3968 | -- and not with other types. | |
3969 | ||
3970 | and then not In_Instance | |
d766cee3 RD |
3971 | then |
3972 | Substitute_Valid_Check; | |
3973 | return; | |
3974 | end if; | |
3975 | ||
630d30e9 RD |
3976 | -- If we have an explicit range, do a bit of optimization based |
3977 | -- on range analysis (we may be able to kill one or both checks). | |
3978 | ||
c800f862 RD |
3979 | Lcheck := Compile_Time_Compare (Lop, Lo, Assume_Valid => False); |
3980 | Ucheck := Compile_Time_Compare (Lop, Hi, Assume_Valid => False); | |
3981 | ||
630d30e9 RD |
3982 | -- If either check is known to fail, replace result by False since |
3983 | -- the other check does not matter. Preserve the static flag for | |
3984 | -- legality checks, because we are constant-folding beyond RM 4.9. | |
fbf5a39b AC |
3985 | |
3986 | if Lcheck = LT or else Ucheck = GT then | |
c800f862 | 3987 | if Warn1 then |
d766cee3 RD |
3988 | Error_Msg_N ("?range test optimized away", N); |
3989 | Error_Msg_N ("\?value is known to be out of range", N); | |
3990 | end if; | |
3991 | ||
fbf5a39b AC |
3992 | Rewrite (N, |
3993 | New_Reference_To (Standard_False, Loc)); | |
3994 | Analyze_And_Resolve (N, Rtyp); | |
7324bf49 | 3995 | Set_Is_Static_Expression (N, Static); |
d766cee3 | 3996 | |
fbf5a39b AC |
3997 | return; |
3998 | ||
685094bf RD |
3999 | -- If both checks are known to succeed, replace result by True, |
4000 | -- since we know we are in range. | |
fbf5a39b AC |
4001 | |
4002 | elsif Lcheck in Compare_GE and then Ucheck in Compare_LE then | |
c800f862 | 4003 | if Warn1 then |
d766cee3 RD |
4004 | Error_Msg_N ("?range test optimized away", N); |
4005 | Error_Msg_N ("\?value is known to be in range", N); | |
4006 | end if; | |
4007 | ||
fbf5a39b AC |
4008 | Rewrite (N, |
4009 | New_Reference_To (Standard_True, Loc)); | |
4010 | Analyze_And_Resolve (N, Rtyp); | |
7324bf49 | 4011 | Set_Is_Static_Expression (N, Static); |
d766cee3 | 4012 | |
fbf5a39b AC |
4013 | return; |
4014 | ||
d766cee3 RD |
4015 | -- If lower bound check succeeds and upper bound check is not |
4016 | -- known to succeed or fail, then replace the range check with | |
4017 | -- a comparison against the upper bound. | |
fbf5a39b AC |
4018 | |
4019 | elsif Lcheck in Compare_GE then | |
94eefd2e | 4020 | if Warn2 and then not In_Instance then |
d766cee3 RD |
4021 | Error_Msg_N ("?lower bound test optimized away", Lo); |
4022 | Error_Msg_N ("\?value is known to be in range", Lo); | |
4023 | end if; | |
4024 | ||
fbf5a39b AC |
4025 | Rewrite (N, |
4026 | Make_Op_Le (Loc, | |
4027 | Left_Opnd => Lop, | |
4028 | Right_Opnd => High_Bound (Rop))); | |
4029 | Analyze_And_Resolve (N, Rtyp); | |
d766cee3 | 4030 | |
fbf5a39b AC |
4031 | return; |
4032 | ||
d766cee3 RD |
4033 | -- If upper bound check succeeds and lower bound check is not |
4034 | -- known to succeed or fail, then replace the range check with | |
4035 | -- a comparison against the lower bound. | |
fbf5a39b AC |
4036 | |
4037 | elsif Ucheck in Compare_LE then | |
94eefd2e | 4038 | if Warn2 and then not In_Instance then |
d766cee3 RD |
4039 | Error_Msg_N ("?upper bound test optimized away", Hi); |
4040 | Error_Msg_N ("\?value is known to be in range", Hi); | |
4041 | end if; | |
4042 | ||
fbf5a39b AC |
4043 | Rewrite (N, |
4044 | Make_Op_Ge (Loc, | |
4045 | Left_Opnd => Lop, | |
4046 | Right_Opnd => Low_Bound (Rop))); | |
4047 | Analyze_And_Resolve (N, Rtyp); | |
d766cee3 | 4048 | |
fbf5a39b AC |
4049 | return; |
4050 | end if; | |
c800f862 RD |
4051 | |
4052 | -- We couldn't optimize away the range check, but there is one | |
4053 | -- more issue. If we are checking constant conditionals, then we | |
4054 | -- see if we can determine the outcome assuming everything is | |
4055 | -- valid, and if so give an appropriate warning. | |
4056 | ||
4057 | if Warn1 and then not Assume_No_Invalid_Values then | |
4058 | Lcheck := Compile_Time_Compare (Lop, Lo, Assume_Valid => True); | |
4059 | Ucheck := Compile_Time_Compare (Lop, Hi, Assume_Valid => True); | |
4060 | ||
4061 | -- Result is out of range for valid value | |
4062 | ||
4063 | if Lcheck = LT or else Ucheck = GT then | |
4064 | Error_Msg_N | |
4065 | ("?value can only be in range if it is invalid", N); | |
4066 | ||
4067 | -- Result is in range for valid value | |
4068 | ||
4069 | elsif Lcheck in Compare_GE and then Ucheck in Compare_LE then | |
4070 | Error_Msg_N | |
4071 | ("?value can only be out of range if it is invalid", N); | |
4072 | ||
4073 | -- Lower bound check succeeds if value is valid | |
4074 | ||
4075 | elsif Warn2 and then Lcheck in Compare_GE then | |
4076 | Error_Msg_N | |
4077 | ("?lower bound check only fails if it is invalid", Lo); | |
4078 | ||
4079 | -- Upper bound check succeeds if value is valid | |
4080 | ||
4081 | elsif Warn2 and then Ucheck in Compare_LE then | |
4082 | Error_Msg_N | |
4083 | ("?upper bound check only fails for invalid values", Hi); | |
4084 | end if; | |
4085 | end if; | |
fbf5a39b AC |
4086 | end; |
4087 | ||
4088 | -- For all other cases of an explicit range, nothing to be done | |
70482933 | 4089 | |
70482933 RK |
4090 | return; |
4091 | ||
4092 | -- Here right operand is a subtype mark | |
4093 | ||
4094 | else | |
4095 | declare | |
fbf5a39b AC |
4096 | Typ : Entity_Id := Etype (Rop); |
4097 | Is_Acc : constant Boolean := Is_Access_Type (Typ); | |
4098 | Obj : Node_Id := Lop; | |
4099 | Cond : Node_Id := Empty; | |
70482933 RK |
4100 | |
4101 | begin | |
4102 | Remove_Side_Effects (Obj); | |
4103 | ||
4104 | -- For tagged type, do tagged membership operation | |
4105 | ||
4106 | if Is_Tagged_Type (Typ) then | |
fbf5a39b | 4107 | |
26bff3d9 JM |
4108 | -- No expansion will be performed when VM_Target, as the VM |
4109 | -- back-ends will handle the membership tests directly (tags | |
4110 | -- are not explicitly represented in Java objects, so the | |
4111 | -- normal tagged membership expansion is not what we want). | |
70482933 | 4112 | |
26bff3d9 | 4113 | if VM_Target = No_VM then |
70482933 RK |
4114 | Rewrite (N, Tagged_Membership (N)); |
4115 | Analyze_And_Resolve (N, Rtyp); | |
4116 | end if; | |
4117 | ||
4118 | return; | |
4119 | ||
20b5d666 | 4120 | -- If type is scalar type, rewrite as x in t'first .. t'last. |
70482933 | 4121 | -- This reason we do this is that the bounds may have the wrong |
c800f862 RD |
4122 | -- type if they come from the original type definition. Also this |
4123 | -- way we get all the processing above for an explicit range. | |
70482933 RK |
4124 | |
4125 | elsif Is_Scalar_Type (Typ) then | |
fbf5a39b | 4126 | Rewrite (Rop, |
70482933 RK |
4127 | Make_Range (Loc, |
4128 | Low_Bound => | |
4129 | Make_Attribute_Reference (Loc, | |
4130 | Attribute_Name => Name_First, | |
4131 | Prefix => New_Reference_To (Typ, Loc)), | |
4132 | ||
4133 | High_Bound => | |
4134 | Make_Attribute_Reference (Loc, | |
4135 | Attribute_Name => Name_Last, | |
4136 | Prefix => New_Reference_To (Typ, Loc)))); | |
4137 | Analyze_And_Resolve (N, Rtyp); | |
4138 | return; | |
5d09245e AC |
4139 | |
4140 | -- Ada 2005 (AI-216): Program_Error is raised when evaluating | |
4141 | -- a membership test if the subtype mark denotes a constrained | |
4142 | -- Unchecked_Union subtype and the expression lacks inferable | |
4143 | -- discriminants. | |
4144 | ||
4145 | elsif Is_Unchecked_Union (Base_Type (Typ)) | |
4146 | and then Is_Constrained (Typ) | |
4147 | and then not Has_Inferable_Discriminants (Lop) | |
4148 | then | |
4149 | Insert_Action (N, | |
4150 | Make_Raise_Program_Error (Loc, | |
4151 | Reason => PE_Unchecked_Union_Restriction)); | |
4152 | ||
4153 | -- Prevent Gigi from generating incorrect code by rewriting | |
4154 | -- the test as a standard False. | |
4155 | ||
4156 | Rewrite (N, | |
4157 | New_Occurrence_Of (Standard_False, Loc)); | |
4158 | ||
4159 | return; | |
70482933 RK |
4160 | end if; |
4161 | ||
fbf5a39b AC |
4162 | -- Here we have a non-scalar type |
4163 | ||
70482933 RK |
4164 | if Is_Acc then |
4165 | Typ := Designated_Type (Typ); | |
4166 | end if; | |
4167 | ||
4168 | if not Is_Constrained (Typ) then | |
4169 | Rewrite (N, | |
4170 | New_Reference_To (Standard_True, Loc)); | |
4171 | Analyze_And_Resolve (N, Rtyp); | |
4172 | ||
685094bf RD |
4173 | -- For the constrained array case, we have to check the subscripts |
4174 | -- for an exact match if the lengths are non-zero (the lengths | |
4175 | -- must match in any case). | |
70482933 RK |
4176 | |
4177 | elsif Is_Array_Type (Typ) then | |
4178 | ||
fbf5a39b | 4179 | Check_Subscripts : declare |
70482933 | 4180 | function Construct_Attribute_Reference |
2e071734 AC |
4181 | (E : Node_Id; |
4182 | Nam : Name_Id; | |
4183 | Dim : Nat) return Node_Id; | |
70482933 RK |
4184 | -- Build attribute reference E'Nam(Dim) |
4185 | ||
fbf5a39b AC |
4186 | ----------------------------------- |
4187 | -- Construct_Attribute_Reference -- | |
4188 | ----------------------------------- | |
4189 | ||
70482933 | 4190 | function Construct_Attribute_Reference |
2e071734 AC |
4191 | (E : Node_Id; |
4192 | Nam : Name_Id; | |
4193 | Dim : Nat) return Node_Id | |
70482933 RK |
4194 | is |
4195 | begin | |
4196 | return | |
4197 | Make_Attribute_Reference (Loc, | |
4198 | Prefix => E, | |
4199 | Attribute_Name => Nam, | |
4200 | Expressions => New_List ( | |
4201 | Make_Integer_Literal (Loc, Dim))); | |
4202 | end Construct_Attribute_Reference; | |
4203 | ||
fad0600d | 4204 | -- Start of processing for Check_Subscripts |
fbf5a39b | 4205 | |
70482933 RK |
4206 | begin |
4207 | for J in 1 .. Number_Dimensions (Typ) loop | |
4208 | Evolve_And_Then (Cond, | |
4209 | Make_Op_Eq (Loc, | |
4210 | Left_Opnd => | |
4211 | Construct_Attribute_Reference | |
fbf5a39b AC |
4212 | (Duplicate_Subexpr_No_Checks (Obj), |
4213 | Name_First, J), | |
70482933 RK |
4214 | Right_Opnd => |
4215 | Construct_Attribute_Reference | |
4216 | (New_Occurrence_Of (Typ, Loc), Name_First, J))); | |
4217 | ||
4218 | Evolve_And_Then (Cond, | |
4219 | Make_Op_Eq (Loc, | |
4220 | Left_Opnd => | |
4221 | Construct_Attribute_Reference | |
fbf5a39b AC |
4222 | (Duplicate_Subexpr_No_Checks (Obj), |
4223 | Name_Last, J), | |
70482933 RK |
4224 | Right_Opnd => |
4225 | Construct_Attribute_Reference | |
4226 | (New_Occurrence_Of (Typ, Loc), Name_Last, J))); | |
4227 | end loop; | |
4228 | ||
4229 | if Is_Acc then | |
fbf5a39b AC |
4230 | Cond := |
4231 | Make_Or_Else (Loc, | |
4232 | Left_Opnd => | |
4233 | Make_Op_Eq (Loc, | |
4234 | Left_Opnd => Obj, | |
4235 | Right_Opnd => Make_Null (Loc)), | |
4236 | Right_Opnd => Cond); | |
70482933 RK |
4237 | end if; |
4238 | ||
4239 | Rewrite (N, Cond); | |
4240 | Analyze_And_Resolve (N, Rtyp); | |
fbf5a39b | 4241 | end Check_Subscripts; |
70482933 | 4242 | |
685094bf RD |
4243 | -- These are the cases where constraint checks may be required, |
4244 | -- e.g. records with possible discriminants | |
70482933 RK |
4245 | |
4246 | else | |
4247 | -- Expand the test into a series of discriminant comparisons. | |
685094bf RD |
4248 | -- The expression that is built is the negation of the one that |
4249 | -- is used for checking discriminant constraints. | |
70482933 RK |
4250 | |
4251 | Obj := Relocate_Node (Left_Opnd (N)); | |
4252 | ||
4253 | if Has_Discriminants (Typ) then | |
4254 | Cond := Make_Op_Not (Loc, | |
4255 | Right_Opnd => Build_Discriminant_Checks (Obj, Typ)); | |
4256 | ||
4257 | if Is_Acc then | |
4258 | Cond := Make_Or_Else (Loc, | |
4259 | Left_Opnd => | |
4260 | Make_Op_Eq (Loc, | |
4261 | Left_Opnd => Obj, | |
4262 | Right_Opnd => Make_Null (Loc)), | |
4263 | Right_Opnd => Cond); | |
4264 | end if; | |
4265 | ||
4266 | else | |
4267 | Cond := New_Occurrence_Of (Standard_True, Loc); | |
4268 | end if; | |
4269 | ||
4270 | Rewrite (N, Cond); | |
4271 | Analyze_And_Resolve (N, Rtyp); | |
4272 | end if; | |
4273 | end; | |
4274 | end if; | |
4275 | end Expand_N_In; | |
4276 | ||
4277 | -------------------------------- | |
4278 | -- Expand_N_Indexed_Component -- | |
4279 | -------------------------------- | |
4280 | ||
4281 | procedure Expand_N_Indexed_Component (N : Node_Id) is | |
4282 | Loc : constant Source_Ptr := Sloc (N); | |
4283 | Typ : constant Entity_Id := Etype (N); | |
4284 | P : constant Node_Id := Prefix (N); | |
4285 | T : constant Entity_Id := Etype (P); | |
4286 | ||
4287 | begin | |
685094bf RD |
4288 | -- A special optimization, if we have an indexed component that is |
4289 | -- selecting from a slice, then we can eliminate the slice, since, for | |
4290 | -- example, x (i .. j)(k) is identical to x(k). The only difference is | |
4291 | -- the range check required by the slice. The range check for the slice | |
4292 | -- itself has already been generated. The range check for the | |
4293 | -- subscripting operation is ensured by converting the subject to | |
4294 | -- the subtype of the slice. | |
4295 | ||
4296 | -- This optimization not only generates better code, avoiding slice | |
4297 | -- messing especially in the packed case, but more importantly bypasses | |
4298 | -- some problems in handling this peculiar case, for example, the issue | |
4299 | -- of dealing specially with object renamings. | |
70482933 RK |
4300 | |
4301 | if Nkind (P) = N_Slice then | |
4302 | Rewrite (N, | |
4303 | Make_Indexed_Component (Loc, | |
4304 | Prefix => Prefix (P), | |
4305 | Expressions => New_List ( | |
4306 | Convert_To | |
4307 | (Etype (First_Index (Etype (P))), | |
4308 | First (Expressions (N)))))); | |
4309 | Analyze_And_Resolve (N, Typ); | |
4310 | return; | |
4311 | end if; | |
4312 | ||
b4592168 GD |
4313 | -- Ada 2005 (AI-318-02): If the prefix is a call to a build-in-place |
4314 | -- function, then additional actuals must be passed. | |
4315 | ||
4316 | if Ada_Version >= Ada_05 | |
4317 | and then Is_Build_In_Place_Function_Call (P) | |
4318 | then | |
4319 | Make_Build_In_Place_Call_In_Anonymous_Context (P); | |
4320 | end if; | |
4321 | ||
685094bf RD |
4322 | -- If the prefix is an access type, then we unconditionally rewrite if |
4323 | -- as an explicit deference. This simplifies processing for several | |
4324 | -- cases, including packed array cases and certain cases in which checks | |
4325 | -- must be generated. We used to try to do this only when it was | |
4326 | -- necessary, but it cleans up the code to do it all the time. | |
70482933 RK |
4327 | |
4328 | if Is_Access_Type (T) then | |
2717634d | 4329 | Insert_Explicit_Dereference (P); |
70482933 RK |
4330 | Analyze_And_Resolve (P, Designated_Type (T)); |
4331 | end if; | |
4332 | ||
fbf5a39b AC |
4333 | -- Generate index and validity checks |
4334 | ||
4335 | Generate_Index_Checks (N); | |
4336 | ||
70482933 RK |
4337 | if Validity_Checks_On and then Validity_Check_Subscripts then |
4338 | Apply_Subscript_Validity_Checks (N); | |
4339 | end if; | |
4340 | ||
4341 | -- All done for the non-packed case | |
4342 | ||
4343 | if not Is_Packed (Etype (Prefix (N))) then | |
4344 | return; | |
4345 | end if; | |
4346 | ||
4347 | -- For packed arrays that are not bit-packed (i.e. the case of an array | |
8fc789c8 | 4348 | -- with one or more index types with a non-contiguous enumeration type), |
70482933 RK |
4349 | -- we can always use the normal packed element get circuit. |
4350 | ||
4351 | if not Is_Bit_Packed_Array (Etype (Prefix (N))) then | |
4352 | Expand_Packed_Element_Reference (N); | |
4353 | return; | |
4354 | end if; | |
4355 | ||
4356 | -- For a reference to a component of a bit packed array, we have to | |
4357 | -- convert it to a reference to the corresponding Packed_Array_Type. | |
4358 | -- We only want to do this for simple references, and not for: | |
4359 | ||
685094bf RD |
4360 | -- Left side of assignment, or prefix of left side of assignment, or |
4361 | -- prefix of the prefix, to handle packed arrays of packed arrays, | |
70482933 RK |
4362 | -- This case is handled in Exp_Ch5.Expand_N_Assignment_Statement |
4363 | ||
4364 | -- Renaming objects in renaming associations | |
4365 | -- This case is handled when a use of the renamed variable occurs | |
4366 | ||
4367 | -- Actual parameters for a procedure call | |
4368 | -- This case is handled in Exp_Ch6.Expand_Actuals | |
4369 | ||
4370 | -- The second expression in a 'Read attribute reference | |
4371 | ||
4372 | -- The prefix of an address or size attribute reference | |
4373 | ||
4374 | -- The following circuit detects these exceptions | |
4375 | ||
4376 | declare | |
4377 | Child : Node_Id := N; | |
4378 | Parnt : Node_Id := Parent (N); | |
4379 | ||
4380 | begin | |
4381 | loop | |
4382 | if Nkind (Parnt) = N_Unchecked_Expression then | |
4383 | null; | |
4384 | ||
303b4d58 AC |
4385 | elsif Nkind_In (Parnt, N_Object_Renaming_Declaration, |
4386 | N_Procedure_Call_Statement) | |
70482933 RK |
4387 | or else (Nkind (Parnt) = N_Parameter_Association |
4388 | and then | |
4389 | Nkind (Parent (Parnt)) = N_Procedure_Call_Statement) | |
4390 | then | |
4391 | return; | |
4392 | ||
4393 | elsif Nkind (Parnt) = N_Attribute_Reference | |
4394 | and then (Attribute_Name (Parnt) = Name_Address | |
4395 | or else | |
4396 | Attribute_Name (Parnt) = Name_Size) | |
4397 | and then Prefix (Parnt) = Child | |
4398 | then | |
4399 | return; | |
4400 | ||
4401 | elsif Nkind (Parnt) = N_Assignment_Statement | |
4402 | and then Name (Parnt) = Child | |
4403 | then | |
4404 | return; | |
4405 | ||
685094bf RD |
4406 | -- If the expression is an index of an indexed component, it must |
4407 | -- be expanded regardless of context. | |
fbf5a39b AC |
4408 | |
4409 | elsif Nkind (Parnt) = N_Indexed_Component | |
4410 | and then Child /= Prefix (Parnt) | |
4411 | then | |
4412 | Expand_Packed_Element_Reference (N); | |
4413 | return; | |
4414 | ||
4415 | elsif Nkind (Parent (Parnt)) = N_Assignment_Statement | |
4416 | and then Name (Parent (Parnt)) = Parnt | |
4417 | then | |
4418 | return; | |
4419 | ||
70482933 RK |
4420 | elsif Nkind (Parnt) = N_Attribute_Reference |
4421 | and then Attribute_Name (Parnt) = Name_Read | |
4422 | and then Next (First (Expressions (Parnt))) = Child | |
4423 | then | |
4424 | return; | |
4425 | ||
303b4d58 | 4426 | elsif Nkind_In (Parnt, N_Indexed_Component, N_Selected_Component) |
70482933 RK |
4427 | and then Prefix (Parnt) = Child |
4428 | then | |
4429 | null; | |
4430 | ||
4431 | else | |
4432 | Expand_Packed_Element_Reference (N); | |
4433 | return; | |
4434 | end if; | |
4435 | ||
685094bf RD |
4436 | -- Keep looking up tree for unchecked expression, or if we are the |
4437 | -- prefix of a possible assignment left side. | |
70482933 RK |
4438 | |
4439 | Child := Parnt; | |
4440 | Parnt := Parent (Child); | |
4441 | end loop; | |
4442 | end; | |
70482933 RK |
4443 | end Expand_N_Indexed_Component; |
4444 | ||
4445 | --------------------- | |
4446 | -- Expand_N_Not_In -- | |
4447 | --------------------- | |
4448 | ||
4449 | -- Replace a not in b by not (a in b) so that the expansions for (a in b) | |
4450 | -- can be done. This avoids needing to duplicate this expansion code. | |
4451 | ||
4452 | procedure Expand_N_Not_In (N : Node_Id) is | |
630d30e9 RD |
4453 | Loc : constant Source_Ptr := Sloc (N); |
4454 | Typ : constant Entity_Id := Etype (N); | |
4455 | Cfs : constant Boolean := Comes_From_Source (N); | |
70482933 RK |
4456 | |
4457 | begin | |
4458 | Rewrite (N, | |
4459 | Make_Op_Not (Loc, | |
4460 | Right_Opnd => | |
4461 | Make_In (Loc, | |
4462 | Left_Opnd => Left_Opnd (N), | |
d766cee3 | 4463 | Right_Opnd => Right_Opnd (N)))); |
630d30e9 | 4464 | |
d766cee3 | 4465 | -- We want this to appear as coming from source if original does (see |
8fc789c8 | 4466 | -- transformations in Expand_N_In). |
630d30e9 RD |
4467 | |
4468 | Set_Comes_From_Source (N, Cfs); | |
4469 | Set_Comes_From_Source (Right_Opnd (N), Cfs); | |
4470 | ||
8fc789c8 | 4471 | -- Now analyze transformed node |
630d30e9 | 4472 | |
70482933 RK |
4473 | Analyze_And_Resolve (N, Typ); |
4474 | end Expand_N_Not_In; | |
4475 | ||
4476 | ------------------- | |
4477 | -- Expand_N_Null -- | |
4478 | ------------------- | |
4479 | ||
685094bf RD |
4480 | -- The only replacement required is for the case of a null of type that is |
4481 | -- an access to protected subprogram. We represent such access values as a | |
4482 | -- record, and so we must replace the occurrence of null by the equivalent | |
4483 | -- record (with a null address and a null pointer in it), so that the | |
4484 | -- backend creates the proper value. | |
70482933 RK |
4485 | |
4486 | procedure Expand_N_Null (N : Node_Id) is | |
4487 | Loc : constant Source_Ptr := Sloc (N); | |
4488 | Typ : constant Entity_Id := Etype (N); | |
4489 | Agg : Node_Id; | |
4490 | ||
4491 | begin | |
26bff3d9 | 4492 | if Is_Access_Protected_Subprogram_Type (Typ) then |
70482933 RK |
4493 | Agg := |
4494 | Make_Aggregate (Loc, | |
4495 | Expressions => New_List ( | |
4496 | New_Occurrence_Of (RTE (RE_Null_Address), Loc), | |
4497 | Make_Null (Loc))); | |
4498 | ||
4499 | Rewrite (N, Agg); | |
4500 | Analyze_And_Resolve (N, Equivalent_Type (Typ)); | |
4501 | ||
685094bf RD |
4502 | -- For subsequent semantic analysis, the node must retain its type. |
4503 | -- Gigi in any case replaces this type by the corresponding record | |
4504 | -- type before processing the node. | |
70482933 RK |
4505 | |
4506 | Set_Etype (N, Typ); | |
4507 | end if; | |
fbf5a39b AC |
4508 | |
4509 | exception | |
4510 | when RE_Not_Available => | |
4511 | return; | |
70482933 RK |
4512 | end Expand_N_Null; |
4513 | ||
4514 | --------------------- | |
4515 | -- Expand_N_Op_Abs -- | |
4516 | --------------------- | |
4517 | ||
4518 | procedure Expand_N_Op_Abs (N : Node_Id) is | |
4519 | Loc : constant Source_Ptr := Sloc (N); | |
4520 | Expr : constant Node_Id := Right_Opnd (N); | |
4521 | ||
4522 | begin | |
4523 | Unary_Op_Validity_Checks (N); | |
4524 | ||
4525 | -- Deal with software overflow checking | |
4526 | ||
07fc65c4 | 4527 | if not Backend_Overflow_Checks_On_Target |
70482933 RK |
4528 | and then Is_Signed_Integer_Type (Etype (N)) |
4529 | and then Do_Overflow_Check (N) | |
4530 | then | |
685094bf RD |
4531 | -- The only case to worry about is when the argument is equal to the |
4532 | -- largest negative number, so what we do is to insert the check: | |
70482933 | 4533 | |
fbf5a39b | 4534 | -- [constraint_error when Expr = typ'Base'First] |
70482933 RK |
4535 | |
4536 | -- with the usual Duplicate_Subexpr use coding for expr | |
4537 | ||
fbf5a39b AC |
4538 | Insert_Action (N, |
4539 | Make_Raise_Constraint_Error (Loc, | |
4540 | Condition => | |
4541 | Make_Op_Eq (Loc, | |
70482933 | 4542 | Left_Opnd => Duplicate_Subexpr (Expr), |
fbf5a39b AC |
4543 | Right_Opnd => |
4544 | Make_Attribute_Reference (Loc, | |
4545 | Prefix => | |
4546 | New_Occurrence_Of (Base_Type (Etype (Expr)), Loc), | |
4547 | Attribute_Name => Name_First)), | |
4548 | Reason => CE_Overflow_Check_Failed)); | |
4549 | end if; | |
70482933 RK |
4550 | |
4551 | -- Vax floating-point types case | |
4552 | ||
fbf5a39b | 4553 | if Vax_Float (Etype (N)) then |
70482933 RK |
4554 | Expand_Vax_Arith (N); |
4555 | end if; | |
4556 | end Expand_N_Op_Abs; | |
4557 | ||
4558 | --------------------- | |
4559 | -- Expand_N_Op_Add -- | |
4560 | --------------------- | |
4561 | ||
4562 | procedure Expand_N_Op_Add (N : Node_Id) is | |
4563 | Typ : constant Entity_Id := Etype (N); | |
4564 | ||
4565 | begin | |
4566 | Binary_Op_Validity_Checks (N); | |
4567 | ||
4568 | -- N + 0 = 0 + N = N for integer types | |
4569 | ||
4570 | if Is_Integer_Type (Typ) then | |
4571 | if Compile_Time_Known_Value (Right_Opnd (N)) | |
4572 | and then Expr_Value (Right_Opnd (N)) = Uint_0 | |
4573 | then | |
4574 | Rewrite (N, Left_Opnd (N)); | |
4575 | return; | |
4576 | ||
4577 | elsif Compile_Time_Known_Value (Left_Opnd (N)) | |
4578 | and then Expr_Value (Left_Opnd (N)) = Uint_0 | |
4579 | then | |
4580 | Rewrite (N, Right_Opnd (N)); | |
4581 | return; | |
4582 | end if; | |
4583 | end if; | |
4584 | ||
fbf5a39b | 4585 | -- Arithmetic overflow checks for signed integer/fixed point types |
70482933 RK |
4586 | |
4587 | if Is_Signed_Integer_Type (Typ) | |
4588 | or else Is_Fixed_Point_Type (Typ) | |
4589 | then | |
4590 | Apply_Arithmetic_Overflow_Check (N); | |
4591 | return; | |
4592 | ||
4593 | -- Vax floating-point types case | |
4594 | ||
4595 | elsif Vax_Float (Typ) then | |
4596 | Expand_Vax_Arith (N); | |
4597 | end if; | |
4598 | end Expand_N_Op_Add; | |
4599 | ||
4600 | --------------------- | |
4601 | -- Expand_N_Op_And -- | |
4602 | --------------------- | |
4603 | ||
4604 | procedure Expand_N_Op_And (N : Node_Id) is | |
4605 | Typ : constant Entity_Id := Etype (N); | |
4606 | ||
4607 | begin | |
4608 | Binary_Op_Validity_Checks (N); | |
4609 | ||
4610 | if Is_Array_Type (Etype (N)) then | |
4611 | Expand_Boolean_Operator (N); | |
4612 | ||
4613 | elsif Is_Boolean_Type (Etype (N)) then | |
4614 | Adjust_Condition (Left_Opnd (N)); | |
4615 | Adjust_Condition (Right_Opnd (N)); | |
4616 | Set_Etype (N, Standard_Boolean); | |
4617 | Adjust_Result_Type (N, Typ); | |
4618 | end if; | |
4619 | end Expand_N_Op_And; | |
4620 | ||
4621 | ------------------------ | |
4622 | -- Expand_N_Op_Concat -- | |
4623 | ------------------------ | |
4624 | ||
4625 | procedure Expand_N_Op_Concat (N : Node_Id) is | |
70482933 RK |
4626 | Opnds : List_Id; |
4627 | -- List of operands to be concatenated | |
4628 | ||
70482933 | 4629 | Cnode : Node_Id; |
685094bf RD |
4630 | -- Node which is to be replaced by the result of concatenating the nodes |
4631 | -- in the list Opnds. | |
70482933 | 4632 | |
70482933 | 4633 | begin |
fbf5a39b AC |
4634 | -- Ensure validity of both operands |
4635 | ||
70482933 RK |
4636 | Binary_Op_Validity_Checks (N); |
4637 | ||
685094bf RD |
4638 | -- If we are the left operand of a concatenation higher up the tree, |
4639 | -- then do nothing for now, since we want to deal with a series of | |
4640 | -- concatenations as a unit. | |
70482933 RK |
4641 | |
4642 | if Nkind (Parent (N)) = N_Op_Concat | |
4643 | and then N = Left_Opnd (Parent (N)) | |
4644 | then | |
4645 | return; | |
4646 | end if; | |
4647 | ||
4648 | -- We get here with a concatenation whose left operand may be a | |
4649 | -- concatenation itself with a consistent type. We need to process | |
4650 | -- these concatenation operands from left to right, which means | |
4651 | -- from the deepest node in the tree to the highest node. | |
4652 | ||
4653 | Cnode := N; | |
4654 | while Nkind (Left_Opnd (Cnode)) = N_Op_Concat loop | |
4655 | Cnode := Left_Opnd (Cnode); | |
4656 | end loop; | |
4657 | ||
4658 | -- Now Opnd is the deepest Opnd, and its parents are the concatenation | |
4659 | -- nodes above, so now we process bottom up, doing the operations. We | |
4660 | -- gather a string that is as long as possible up to five operands | |
4661 | ||
df46b832 AC |
4662 | -- The outer loop runs more than once if more than one concatenation |
4663 | -- type is involved. | |
70482933 RK |
4664 | |
4665 | Outer : loop | |
4666 | Opnds := New_List (Left_Opnd (Cnode), Right_Opnd (Cnode)); | |
4667 | Set_Parent (Opnds, N); | |
4668 | ||
df46b832 | 4669 | -- The inner loop gathers concatenation operands |
70482933 RK |
4670 | |
4671 | Inner : while Cnode /= N | |
70482933 RK |
4672 | and then Base_Type (Etype (Cnode)) = |
4673 | Base_Type (Etype (Parent (Cnode))) | |
4674 | loop | |
4675 | Cnode := Parent (Cnode); | |
4676 | Append (Right_Opnd (Cnode), Opnds); | |
4677 | end loop Inner; | |
4678 | ||
fdac1f80 | 4679 | Expand_Concatenate (Cnode, Opnds); |
70482933 RK |
4680 | |
4681 | exit Outer when Cnode = N; | |
4682 | Cnode := Parent (Cnode); | |
4683 | end loop Outer; | |
4684 | end Expand_N_Op_Concat; | |
4685 | ||
4686 | ------------------------ | |
4687 | -- Expand_N_Op_Divide -- | |
4688 | ------------------------ | |
4689 | ||
4690 | procedure Expand_N_Op_Divide (N : Node_Id) is | |
f82944b7 JM |
4691 | Loc : constant Source_Ptr := Sloc (N); |
4692 | Lopnd : constant Node_Id := Left_Opnd (N); | |
4693 | Ropnd : constant Node_Id := Right_Opnd (N); | |
4694 | Ltyp : constant Entity_Id := Etype (Lopnd); | |
4695 | Rtyp : constant Entity_Id := Etype (Ropnd); | |
4696 | Typ : Entity_Id := Etype (N); | |
4697 | Rknow : constant Boolean := Is_Integer_Type (Typ) | |
4698 | and then | |
4699 | Compile_Time_Known_Value (Ropnd); | |
4700 | Rval : Uint; | |
70482933 RK |
4701 | |
4702 | begin | |
4703 | Binary_Op_Validity_Checks (N); | |
4704 | ||
f82944b7 JM |
4705 | if Rknow then |
4706 | Rval := Expr_Value (Ropnd); | |
4707 | end if; | |
4708 | ||
70482933 RK |
4709 | -- N / 1 = N for integer types |
4710 | ||
f82944b7 JM |
4711 | if Rknow and then Rval = Uint_1 then |
4712 | Rewrite (N, Lopnd); | |
70482933 RK |
4713 | return; |
4714 | end if; | |
4715 | ||
4716 | -- Convert x / 2 ** y to Shift_Right (x, y). Note that the fact that | |
4717 | -- Is_Power_Of_2_For_Shift is set means that we know that our left | |
4718 | -- operand is an unsigned integer, as required for this to work. | |
4719 | ||
f82944b7 JM |
4720 | if Nkind (Ropnd) = N_Op_Expon |
4721 | and then Is_Power_Of_2_For_Shift (Ropnd) | |
fbf5a39b AC |
4722 | |
4723 | -- We cannot do this transformation in configurable run time mode if we | |
4724 | -- have 64-bit -- integers and long shifts are not available. | |
4725 | ||
4726 | and then | |
4727 | (Esize (Ltyp) <= 32 | |
4728 | or else Support_Long_Shifts_On_Target) | |
70482933 RK |
4729 | then |
4730 | Rewrite (N, | |
4731 | Make_Op_Shift_Right (Loc, | |
f82944b7 | 4732 | Left_Opnd => Lopnd, |
70482933 | 4733 | Right_Opnd => |
f82944b7 | 4734 | Convert_To (Standard_Natural, Right_Opnd (Ropnd)))); |
70482933 RK |
4735 | Analyze_And_Resolve (N, Typ); |
4736 | return; | |
4737 | end if; | |
4738 | ||
4739 | -- Do required fixup of universal fixed operation | |
4740 | ||
4741 | if Typ = Universal_Fixed then | |
4742 | Fixup_Universal_Fixed_Operation (N); | |
4743 | Typ := Etype (N); | |
4744 | end if; | |
4745 | ||
4746 | -- Divisions with fixed-point results | |
4747 | ||
4748 | if Is_Fixed_Point_Type (Typ) then | |
4749 | ||
685094bf RD |
4750 | -- No special processing if Treat_Fixed_As_Integer is set, since |
4751 | -- from a semantic point of view such operations are simply integer | |
4752 | -- operations and will be treated that way. | |
70482933 RK |
4753 | |
4754 | if not Treat_Fixed_As_Integer (N) then | |
4755 | if Is_Integer_Type (Rtyp) then | |
4756 | Expand_Divide_Fixed_By_Integer_Giving_Fixed (N); | |
4757 | else | |
4758 | Expand_Divide_Fixed_By_Fixed_Giving_Fixed (N); | |
4759 | end if; | |
4760 | end if; | |
4761 | ||
685094bf RD |
4762 | -- Other cases of division of fixed-point operands. Again we exclude the |
4763 | -- case where Treat_Fixed_As_Integer is set. | |
70482933 RK |
4764 | |
4765 | elsif (Is_Fixed_Point_Type (Ltyp) or else | |
4766 | Is_Fixed_Point_Type (Rtyp)) | |
4767 | and then not Treat_Fixed_As_Integer (N) | |
4768 | then | |
4769 | if Is_Integer_Type (Typ) then | |
4770 | Expand_Divide_Fixed_By_Fixed_Giving_Integer (N); | |
4771 | else | |
4772 | pragma Assert (Is_Floating_Point_Type (Typ)); | |
4773 | Expand_Divide_Fixed_By_Fixed_Giving_Float (N); | |
4774 | end if; | |
4775 | ||
685094bf RD |
4776 | -- Mixed-mode operations can appear in a non-static universal context, |
4777 | -- in which case the integer argument must be converted explicitly. | |
70482933 RK |
4778 | |
4779 | elsif Typ = Universal_Real | |
4780 | and then Is_Integer_Type (Rtyp) | |
4781 | then | |
f82944b7 JM |
4782 | Rewrite (Ropnd, |
4783 | Convert_To (Universal_Real, Relocate_Node (Ropnd))); | |
70482933 | 4784 | |
f82944b7 | 4785 | Analyze_And_Resolve (Ropnd, Universal_Real); |
70482933 RK |
4786 | |
4787 | elsif Typ = Universal_Real | |
4788 | and then Is_Integer_Type (Ltyp) | |
4789 | then | |
f82944b7 JM |
4790 | Rewrite (Lopnd, |
4791 | Convert_To (Universal_Real, Relocate_Node (Lopnd))); | |
70482933 | 4792 | |
f82944b7 | 4793 | Analyze_And_Resolve (Lopnd, Universal_Real); |
70482933 | 4794 | |
f02b8bb8 | 4795 | -- Non-fixed point cases, do integer zero divide and overflow checks |
70482933 RK |
4796 | |
4797 | elsif Is_Integer_Type (Typ) then | |
4798 | Apply_Divide_Check (N); | |
fbf5a39b | 4799 | |
f82944b7 JM |
4800 | -- Check for 64-bit division available, or long shifts if the divisor |
4801 | -- is a small power of 2 (since such divides will be converted into | |
4802 | -- long shifts. | |
fbf5a39b AC |
4803 | |
4804 | if Esize (Ltyp) > 32 | |
4805 | and then not Support_64_Bit_Divides_On_Target | |
f82944b7 JM |
4806 | and then |
4807 | (not Rknow | |
4808 | or else not Support_Long_Shifts_On_Target | |
4809 | or else (Rval /= Uint_2 and then | |
4810 | Rval /= Uint_4 and then | |
4811 | Rval /= Uint_8 and then | |
4812 | Rval /= Uint_16 and then | |
4813 | Rval /= Uint_32 and then | |
4814 | Rval /= Uint_64)) | |
fbf5a39b AC |
4815 | then |
4816 | Error_Msg_CRT ("64-bit division", N); | |
4817 | end if; | |
f02b8bb8 RD |
4818 | |
4819 | -- Deal with Vax_Float | |
4820 | ||
4821 | elsif Vax_Float (Typ) then | |
4822 | Expand_Vax_Arith (N); | |
4823 | return; | |
70482933 RK |
4824 | end if; |
4825 | end Expand_N_Op_Divide; | |
4826 | ||
4827 | -------------------- | |
4828 | -- Expand_N_Op_Eq -- | |
4829 | -------------------- | |
4830 | ||
4831 | procedure Expand_N_Op_Eq (N : Node_Id) is | |
fbf5a39b AC |
4832 | Loc : constant Source_Ptr := Sloc (N); |
4833 | Typ : constant Entity_Id := Etype (N); | |
4834 | Lhs : constant Node_Id := Left_Opnd (N); | |
4835 | Rhs : constant Node_Id := Right_Opnd (N); | |
4836 | Bodies : constant List_Id := New_List; | |
4837 | A_Typ : constant Entity_Id := Etype (Lhs); | |
4838 | ||
70482933 RK |
4839 | Typl : Entity_Id := A_Typ; |
4840 | Op_Name : Entity_Id; | |
4841 | Prim : Elmt_Id; | |
70482933 RK |
4842 | |
4843 | procedure Build_Equality_Call (Eq : Entity_Id); | |
4844 | -- If a constructed equality exists for the type or for its parent, | |
4845 | -- build and analyze call, adding conversions if the operation is | |
4846 | -- inherited. | |
4847 | ||
5d09245e | 4848 | function Has_Unconstrained_UU_Component (Typ : Node_Id) return Boolean; |
8fc789c8 | 4849 | -- Determines whether a type has a subcomponent of an unconstrained |
5d09245e AC |
4850 | -- Unchecked_Union subtype. Typ is a record type. |
4851 | ||
70482933 RK |
4852 | ------------------------- |
4853 | -- Build_Equality_Call -- | |
4854 | ------------------------- | |
4855 | ||
4856 | procedure Build_Equality_Call (Eq : Entity_Id) is | |
4857 | Op_Type : constant Entity_Id := Etype (First_Formal (Eq)); | |
4858 | L_Exp : Node_Id := Relocate_Node (Lhs); | |
4859 | R_Exp : Node_Id := Relocate_Node (Rhs); | |
4860 | ||
4861 | begin | |
4862 | if Base_Type (Op_Type) /= Base_Type (A_Typ) | |
4863 | and then not Is_Class_Wide_Type (A_Typ) | |
4864 | then | |
4865 | L_Exp := OK_Convert_To (Op_Type, L_Exp); | |
4866 | R_Exp := OK_Convert_To (Op_Type, R_Exp); | |
4867 | end if; | |
4868 | ||
5d09245e AC |
4869 | -- If we have an Unchecked_Union, we need to add the inferred |
4870 | -- discriminant values as actuals in the function call. At this | |
4871 | -- point, the expansion has determined that both operands have | |
4872 | -- inferable discriminants. | |
4873 | ||
4874 | if Is_Unchecked_Union (Op_Type) then | |
4875 | declare | |
4876 | Lhs_Type : constant Node_Id := Etype (L_Exp); | |
4877 | Rhs_Type : constant Node_Id := Etype (R_Exp); | |
4878 | Lhs_Discr_Val : Node_Id; | |
4879 | Rhs_Discr_Val : Node_Id; | |
4880 | ||
4881 | begin | |
4882 | -- Per-object constrained selected components require special | |
4883 | -- attention. If the enclosing scope of the component is an | |
f02b8bb8 | 4884 | -- Unchecked_Union, we cannot reference its discriminants |
5d09245e AC |
4885 | -- directly. This is why we use the two extra parameters of |
4886 | -- the equality function of the enclosing Unchecked_Union. | |
4887 | ||
4888 | -- type UU_Type (Discr : Integer := 0) is | |
4889 | -- . . . | |
4890 | -- end record; | |
4891 | -- pragma Unchecked_Union (UU_Type); | |
4892 | ||
4893 | -- 1. Unchecked_Union enclosing record: | |
4894 | ||
4895 | -- type Enclosing_UU_Type (Discr : Integer := 0) is record | |
4896 | -- . . . | |
4897 | -- Comp : UU_Type (Discr); | |
4898 | -- . . . | |
4899 | -- end Enclosing_UU_Type; | |
4900 | -- pragma Unchecked_Union (Enclosing_UU_Type); | |
4901 | ||
4902 | -- Obj1 : Enclosing_UU_Type; | |
4903 | -- Obj2 : Enclosing_UU_Type (1); | |
4904 | ||
2717634d | 4905 | -- [. . .] Obj1 = Obj2 [. . .] |
5d09245e AC |
4906 | |
4907 | -- Generated code: | |
4908 | ||
4909 | -- if not (uu_typeEQ (obj1.comp, obj2.comp, a, b)) then | |
4910 | ||
4911 | -- A and B are the formal parameters of the equality function | |
4912 | -- of Enclosing_UU_Type. The function always has two extra | |
4913 | -- formals to capture the inferred discriminant values. | |
4914 | ||
4915 | -- 2. Non-Unchecked_Union enclosing record: | |
4916 | ||
4917 | -- type | |
4918 | -- Enclosing_Non_UU_Type (Discr : Integer := 0) | |
4919 | -- is record | |
4920 | -- . . . | |
4921 | -- Comp : UU_Type (Discr); | |
4922 | -- . . . | |
4923 | -- end Enclosing_Non_UU_Type; | |
4924 | ||
4925 | -- Obj1 : Enclosing_Non_UU_Type; | |
4926 | -- Obj2 : Enclosing_Non_UU_Type (1); | |
4927 | ||
630d30e9 | 4928 | -- ... Obj1 = Obj2 ... |
5d09245e AC |
4929 | |
4930 | -- Generated code: | |
4931 | ||
4932 | -- if not (uu_typeEQ (obj1.comp, obj2.comp, | |
4933 | -- obj1.discr, obj2.discr)) then | |
4934 | ||
4935 | -- In this case we can directly reference the discriminants of | |
4936 | -- the enclosing record. | |
4937 | ||
4938 | -- Lhs of equality | |
4939 | ||
4940 | if Nkind (Lhs) = N_Selected_Component | |
5e1c00fa RD |
4941 | and then Has_Per_Object_Constraint |
4942 | (Entity (Selector_Name (Lhs))) | |
5d09245e AC |
4943 | then |
4944 | -- Enclosing record is an Unchecked_Union, use formal A | |
4945 | ||
4946 | if Is_Unchecked_Union (Scope | |
4947 | (Entity (Selector_Name (Lhs)))) | |
4948 | then | |
4949 | Lhs_Discr_Val := | |
4950 | Make_Identifier (Loc, | |
4951 | Chars => Name_A); | |
4952 | ||
4953 | -- Enclosing record is of a non-Unchecked_Union type, it is | |
4954 | -- possible to reference the discriminant. | |
4955 | ||
4956 | else | |
4957 | Lhs_Discr_Val := | |
4958 | Make_Selected_Component (Loc, | |
4959 | Prefix => Prefix (Lhs), | |
4960 | Selector_Name => | |
5e1c00fa RD |
4961 | New_Copy |
4962 | (Get_Discriminant_Value | |
4963 | (First_Discriminant (Lhs_Type), | |
4964 | Lhs_Type, | |
4965 | Stored_Constraint (Lhs_Type)))); | |
5d09245e AC |
4966 | end if; |
4967 | ||
4968 | -- Comment needed here ??? | |
4969 | ||
4970 | else | |
4971 | -- Infer the discriminant value | |
4972 | ||
4973 | Lhs_Discr_Val := | |
5e1c00fa RD |
4974 | New_Copy |
4975 | (Get_Discriminant_Value | |
4976 | (First_Discriminant (Lhs_Type), | |
4977 | Lhs_Type, | |
4978 | Stored_Constraint (Lhs_Type))); | |
5d09245e AC |
4979 | end if; |
4980 | ||
4981 | -- Rhs of equality | |
4982 | ||
4983 | if Nkind (Rhs) = N_Selected_Component | |
5e1c00fa RD |
4984 | and then Has_Per_Object_Constraint |
4985 | (Entity (Selector_Name (Rhs))) | |
5d09245e | 4986 | then |
5e1c00fa RD |
4987 | if Is_Unchecked_Union |
4988 | (Scope (Entity (Selector_Name (Rhs)))) | |
5d09245e AC |
4989 | then |
4990 | Rhs_Discr_Val := | |
4991 | Make_Identifier (Loc, | |
4992 | Chars => Name_B); | |
4993 | ||
4994 | else | |
4995 | Rhs_Discr_Val := | |
4996 | Make_Selected_Component (Loc, | |
4997 | Prefix => Prefix (Rhs), | |
4998 | Selector_Name => | |
4999 | New_Copy (Get_Discriminant_Value ( | |
5000 | First_Discriminant (Rhs_Type), | |
5001 | Rhs_Type, | |
5002 | Stored_Constraint (Rhs_Type)))); | |
5003 | ||
5004 | end if; | |
5005 | else | |
5006 | Rhs_Discr_Val := | |
5007 | New_Copy (Get_Discriminant_Value ( | |
5008 | First_Discriminant (Rhs_Type), | |
5009 | Rhs_Type, | |
5010 | Stored_Constraint (Rhs_Type))); | |
5011 | ||
5012 | end if; | |
5013 | ||
5014 | Rewrite (N, | |
5015 | Make_Function_Call (Loc, | |
5016 | Name => New_Reference_To (Eq, Loc), | |
5017 | Parameter_Associations => New_List ( | |
5018 | L_Exp, | |
5019 | R_Exp, | |
5020 | Lhs_Discr_Val, | |
5021 | Rhs_Discr_Val))); | |
5022 | end; | |
5023 | ||
5024 | -- Normal case, not an unchecked union | |
5025 | ||
5026 | else | |
5027 | Rewrite (N, | |
5028 | Make_Function_Call (Loc, | |
5029 | Name => New_Reference_To (Eq, Loc), | |
5030 | Parameter_Associations => New_List (L_Exp, R_Exp))); | |
5031 | end if; | |
70482933 RK |
5032 | |
5033 | Analyze_And_Resolve (N, Standard_Boolean, Suppress => All_Checks); | |
5034 | end Build_Equality_Call; | |
5035 | ||
5d09245e AC |
5036 | ------------------------------------ |
5037 | -- Has_Unconstrained_UU_Component -- | |
5038 | ------------------------------------ | |
5039 | ||
5040 | function Has_Unconstrained_UU_Component | |
5041 | (Typ : Node_Id) return Boolean | |
5042 | is | |
5043 | Tdef : constant Node_Id := | |
57848bf7 | 5044 | Type_Definition (Declaration_Node (Base_Type (Typ))); |
5d09245e AC |
5045 | Clist : Node_Id; |
5046 | Vpart : Node_Id; | |
5047 | ||
5048 | function Component_Is_Unconstrained_UU | |
5049 | (Comp : Node_Id) return Boolean; | |
5050 | -- Determines whether the subtype of the component is an | |
5051 | -- unconstrained Unchecked_Union. | |
5052 | ||
5053 | function Variant_Is_Unconstrained_UU | |
5054 | (Variant : Node_Id) return Boolean; | |
5055 | -- Determines whether a component of the variant has an unconstrained | |
5056 | -- Unchecked_Union subtype. | |
5057 | ||
5058 | ----------------------------------- | |
5059 | -- Component_Is_Unconstrained_UU -- | |
5060 | ----------------------------------- | |
5061 | ||
5062 | function Component_Is_Unconstrained_UU | |
5063 | (Comp : Node_Id) return Boolean | |
5064 | is | |
5065 | begin | |
5066 | if Nkind (Comp) /= N_Component_Declaration then | |
5067 | return False; | |
5068 | end if; | |
5069 | ||
5070 | declare | |
5071 | Sindic : constant Node_Id := | |
5072 | Subtype_Indication (Component_Definition (Comp)); | |
5073 | ||
5074 | begin | |
5075 | -- Unconstrained nominal type. In the case of a constraint | |
5076 | -- present, the node kind would have been N_Subtype_Indication. | |
5077 | ||
5078 | if Nkind (Sindic) = N_Identifier then | |
5079 | return Is_Unchecked_Union (Base_Type (Etype (Sindic))); | |
5080 | end if; | |
5081 | ||
5082 | return False; | |
5083 | end; | |
5084 | end Component_Is_Unconstrained_UU; | |
5085 | ||
5086 | --------------------------------- | |
5087 | -- Variant_Is_Unconstrained_UU -- | |
5088 | --------------------------------- | |
5089 | ||
5090 | function Variant_Is_Unconstrained_UU | |
5091 | (Variant : Node_Id) return Boolean | |
5092 | is | |
5093 | Clist : constant Node_Id := Component_List (Variant); | |
5094 | ||
5095 | begin | |
5096 | if Is_Empty_List (Component_Items (Clist)) then | |
5097 | return False; | |
5098 | end if; | |
5099 | ||
f02b8bb8 RD |
5100 | -- We only need to test one component |
5101 | ||
5d09245e AC |
5102 | declare |
5103 | Comp : Node_Id := First (Component_Items (Clist)); | |
5104 | ||
5105 | begin | |
5106 | while Present (Comp) loop | |
5d09245e AC |
5107 | if Component_Is_Unconstrained_UU (Comp) then |
5108 | return True; | |
5109 | end if; | |
5110 | ||
5111 | Next (Comp); | |
5112 | end loop; | |
5113 | end; | |
5114 | ||
5115 | -- None of the components withing the variant were of | |
5116 | -- unconstrained Unchecked_Union type. | |
5117 | ||
5118 | return False; | |
5119 | end Variant_Is_Unconstrained_UU; | |
5120 | ||
5121 | -- Start of processing for Has_Unconstrained_UU_Component | |
5122 | ||
5123 | begin | |
5124 | if Null_Present (Tdef) then | |
5125 | return False; | |
5126 | end if; | |
5127 | ||
5128 | Clist := Component_List (Tdef); | |
5129 | Vpart := Variant_Part (Clist); | |
5130 | ||
5131 | -- Inspect available components | |
5132 | ||
5133 | if Present (Component_Items (Clist)) then | |
5134 | declare | |
5135 | Comp : Node_Id := First (Component_Items (Clist)); | |
5136 | ||
5137 | begin | |
5138 | while Present (Comp) loop | |
5139 | ||
8fc789c8 | 5140 | -- One component is sufficient |
5d09245e AC |
5141 | |
5142 | if Component_Is_Unconstrained_UU (Comp) then | |
5143 | return True; | |
5144 | end if; | |
5145 | ||
5146 | Next (Comp); | |
5147 | end loop; | |
5148 | end; | |
5149 | end if; | |
5150 | ||
5151 | -- Inspect available components withing variants | |
5152 | ||
5153 | if Present (Vpart) then | |
5154 | declare | |
5155 | Variant : Node_Id := First (Variants (Vpart)); | |
5156 | ||
5157 | begin | |
5158 | while Present (Variant) loop | |
5159 | ||
8fc789c8 | 5160 | -- One component within a variant is sufficient |
5d09245e AC |
5161 | |
5162 | if Variant_Is_Unconstrained_UU (Variant) then | |
5163 | return True; | |
5164 | end if; | |
5165 | ||
5166 | Next (Variant); | |
5167 | end loop; | |
5168 | end; | |
5169 | end if; | |
5170 | ||
5171 | -- Neither the available components, nor the components inside the | |
5172 | -- variant parts were of an unconstrained Unchecked_Union subtype. | |
5173 | ||
5174 | return False; | |
5175 | end Has_Unconstrained_UU_Component; | |
5176 | ||
70482933 RK |
5177 | -- Start of processing for Expand_N_Op_Eq |
5178 | ||
5179 | begin | |
5180 | Binary_Op_Validity_Checks (N); | |
5181 | ||
5182 | if Ekind (Typl) = E_Private_Type then | |
5183 | Typl := Underlying_Type (Typl); | |
70482933 RK |
5184 | elsif Ekind (Typl) = E_Private_Subtype then |
5185 | Typl := Underlying_Type (Base_Type (Typl)); | |
f02b8bb8 RD |
5186 | else |
5187 | null; | |
70482933 RK |
5188 | end if; |
5189 | ||
5190 | -- It may happen in error situations that the underlying type is not | |
5191 | -- set. The error will be detected later, here we just defend the | |
5192 | -- expander code. | |
5193 | ||
5194 | if No (Typl) then | |
5195 | return; | |
5196 | end if; | |
5197 | ||
5198 | Typl := Base_Type (Typl); | |
5199 | ||
70482933 RK |
5200 | -- Boolean types (requiring handling of non-standard case) |
5201 | ||
f02b8bb8 | 5202 | if Is_Boolean_Type (Typl) then |
70482933 RK |
5203 | Adjust_Condition (Left_Opnd (N)); |
5204 | Adjust_Condition (Right_Opnd (N)); | |
5205 | Set_Etype (N, Standard_Boolean); | |
5206 | Adjust_Result_Type (N, Typ); | |
5207 | ||
5208 | -- Array types | |
5209 | ||
5210 | elsif Is_Array_Type (Typl) then | |
5211 | ||
1033834f RD |
5212 | -- If we are doing full validity checking, and it is possible for the |
5213 | -- array elements to be invalid then expand out array comparisons to | |
5214 | -- make sure that we check the array elements. | |
fbf5a39b | 5215 | |
1033834f RD |
5216 | if Validity_Check_Operands |
5217 | and then not Is_Known_Valid (Component_Type (Typl)) | |
5218 | then | |
fbf5a39b AC |
5219 | declare |
5220 | Save_Force_Validity_Checks : constant Boolean := | |
5221 | Force_Validity_Checks; | |
5222 | begin | |
5223 | Force_Validity_Checks := True; | |
5224 | Rewrite (N, | |
0da2c8ac AC |
5225 | Expand_Array_Equality |
5226 | (N, | |
5227 | Relocate_Node (Lhs), | |
5228 | Relocate_Node (Rhs), | |
5229 | Bodies, | |
5230 | Typl)); | |
5231 | Insert_Actions (N, Bodies); | |
fbf5a39b AC |
5232 | Analyze_And_Resolve (N, Standard_Boolean); |
5233 | Force_Validity_Checks := Save_Force_Validity_Checks; | |
5234 | end; | |
5235 | ||
a9d8907c | 5236 | -- Packed case where both operands are known aligned |
70482933 | 5237 | |
a9d8907c JM |
5238 | elsif Is_Bit_Packed_Array (Typl) |
5239 | and then not Is_Possibly_Unaligned_Object (Lhs) | |
5240 | and then not Is_Possibly_Unaligned_Object (Rhs) | |
5241 | then | |
70482933 RK |
5242 | Expand_Packed_Eq (N); |
5243 | ||
5e1c00fa RD |
5244 | -- Where the component type is elementary we can use a block bit |
5245 | -- comparison (if supported on the target) exception in the case | |
5246 | -- of floating-point (negative zero issues require element by | |
5247 | -- element comparison), and atomic types (where we must be sure | |
a9d8907c | 5248 | -- to load elements independently) and possibly unaligned arrays. |
70482933 | 5249 | |
70482933 RK |
5250 | elsif Is_Elementary_Type (Component_Type (Typl)) |
5251 | and then not Is_Floating_Point_Type (Component_Type (Typl)) | |
5e1c00fa | 5252 | and then not Is_Atomic (Component_Type (Typl)) |
a9d8907c JM |
5253 | and then not Is_Possibly_Unaligned_Object (Lhs) |
5254 | and then not Is_Possibly_Unaligned_Object (Rhs) | |
fbf5a39b | 5255 | and then Support_Composite_Compare_On_Target |
70482933 RK |
5256 | then |
5257 | null; | |
5258 | ||
685094bf RD |
5259 | -- For composite and floating-point cases, expand equality loop to |
5260 | -- make sure of using proper comparisons for tagged types, and | |
5261 | -- correctly handling the floating-point case. | |
70482933 RK |
5262 | |
5263 | else | |
5264 | Rewrite (N, | |
0da2c8ac AC |
5265 | Expand_Array_Equality |
5266 | (N, | |
5267 | Relocate_Node (Lhs), | |
5268 | Relocate_Node (Rhs), | |
5269 | Bodies, | |
5270 | Typl)); | |
70482933 RK |
5271 | Insert_Actions (N, Bodies, Suppress => All_Checks); |
5272 | Analyze_And_Resolve (N, Standard_Boolean, Suppress => All_Checks); | |
5273 | end if; | |
5274 | ||
5275 | -- Record Types | |
5276 | ||
5277 | elsif Is_Record_Type (Typl) then | |
5278 | ||
5279 | -- For tagged types, use the primitive "=" | |
5280 | ||
5281 | if Is_Tagged_Type (Typl) then | |
5282 | ||
0669bebe GB |
5283 | -- No need to do anything else compiling under restriction |
5284 | -- No_Dispatching_Calls. During the semantic analysis we | |
5285 | -- already notified such violation. | |
5286 | ||
5287 | if Restriction_Active (No_Dispatching_Calls) then | |
5288 | return; | |
5289 | end if; | |
5290 | ||
685094bf RD |
5291 | -- If this is derived from an untagged private type completed with |
5292 | -- a tagged type, it does not have a full view, so we use the | |
5293 | -- primitive operations of the private type. This check should no | |
5294 | -- longer be necessary when these types get their full views??? | |
70482933 RK |
5295 | |
5296 | if Is_Private_Type (A_Typ) | |
5297 | and then not Is_Tagged_Type (A_Typ) | |
5298 | and then Is_Derived_Type (A_Typ) | |
5299 | and then No (Full_View (A_Typ)) | |
5300 | then | |
685094bf RD |
5301 | -- Search for equality operation, checking that the operands |
5302 | -- have the same type. Note that we must find a matching entry, | |
5303 | -- or something is very wrong! | |
2e071734 | 5304 | |
70482933 RK |
5305 | Prim := First_Elmt (Collect_Primitive_Operations (A_Typ)); |
5306 | ||
2e071734 AC |
5307 | while Present (Prim) loop |
5308 | exit when Chars (Node (Prim)) = Name_Op_Eq | |
5309 | and then Etype (First_Formal (Node (Prim))) = | |
5310 | Etype (Next_Formal (First_Formal (Node (Prim)))) | |
5311 | and then | |
5312 | Base_Type (Etype (Node (Prim))) = Standard_Boolean; | |
5313 | ||
70482933 | 5314 | Next_Elmt (Prim); |
70482933 RK |
5315 | end loop; |
5316 | ||
2e071734 | 5317 | pragma Assert (Present (Prim)); |
70482933 | 5318 | Op_Name := Node (Prim); |
fbf5a39b AC |
5319 | |
5320 | -- Find the type's predefined equality or an overriding | |
685094bf | 5321 | -- user- defined equality. The reason for not simply calling |
fbf5a39b | 5322 | -- Find_Prim_Op here is that there may be a user-defined |
685094bf RD |
5323 | -- overloaded equality op that precedes the equality that we want, |
5324 | -- so we have to explicitly search (e.g., there could be an | |
5325 | -- equality with two different parameter types). | |
fbf5a39b | 5326 | |
70482933 | 5327 | else |
fbf5a39b AC |
5328 | if Is_Class_Wide_Type (Typl) then |
5329 | Typl := Root_Type (Typl); | |
5330 | end if; | |
5331 | ||
5332 | Prim := First_Elmt (Primitive_Operations (Typl)); | |
fbf5a39b AC |
5333 | while Present (Prim) loop |
5334 | exit when Chars (Node (Prim)) = Name_Op_Eq | |
5335 | and then Etype (First_Formal (Node (Prim))) = | |
5336 | Etype (Next_Formal (First_Formal (Node (Prim)))) | |
12e0c41c AC |
5337 | and then |
5338 | Base_Type (Etype (Node (Prim))) = Standard_Boolean; | |
fbf5a39b AC |
5339 | |
5340 | Next_Elmt (Prim); | |
fbf5a39b AC |
5341 | end loop; |
5342 | ||
2e071734 | 5343 | pragma Assert (Present (Prim)); |
fbf5a39b | 5344 | Op_Name := Node (Prim); |
70482933 RK |
5345 | end if; |
5346 | ||
5347 | Build_Equality_Call (Op_Name); | |
5348 | ||
5d09245e AC |
5349 | -- Ada 2005 (AI-216): Program_Error is raised when evaluating the |
5350 | -- predefined equality operator for a type which has a subcomponent | |
5351 | -- of an Unchecked_Union type whose nominal subtype is unconstrained. | |
5352 | ||
5353 | elsif Has_Unconstrained_UU_Component (Typl) then | |
5354 | Insert_Action (N, | |
5355 | Make_Raise_Program_Error (Loc, | |
5356 | Reason => PE_Unchecked_Union_Restriction)); | |
5357 | ||
5358 | -- Prevent Gigi from generating incorrect code by rewriting the | |
5359 | -- equality as a standard False. | |
5360 | ||
5361 | Rewrite (N, | |
5362 | New_Occurrence_Of (Standard_False, Loc)); | |
5363 | ||
5364 | elsif Is_Unchecked_Union (Typl) then | |
5365 | ||
5366 | -- If we can infer the discriminants of the operands, we make a | |
5367 | -- call to the TSS equality function. | |
5368 | ||
5369 | if Has_Inferable_Discriminants (Lhs) | |
5370 | and then | |
5371 | Has_Inferable_Discriminants (Rhs) | |
5372 | then | |
5373 | Build_Equality_Call | |
5374 | (TSS (Root_Type (Typl), TSS_Composite_Equality)); | |
5375 | ||
5376 | else | |
5377 | -- Ada 2005 (AI-216): Program_Error is raised when evaluating | |
5378 | -- the predefined equality operator for an Unchecked_Union type | |
5379 | -- if either of the operands lack inferable discriminants. | |
5380 | ||
5381 | Insert_Action (N, | |
5382 | Make_Raise_Program_Error (Loc, | |
5383 | Reason => PE_Unchecked_Union_Restriction)); | |
5384 | ||
5385 | -- Prevent Gigi from generating incorrect code by rewriting | |
5386 | -- the equality as a standard False. | |
5387 | ||
5388 | Rewrite (N, | |
5389 | New_Occurrence_Of (Standard_False, Loc)); | |
5390 | ||
5391 | end if; | |
5392 | ||
70482933 RK |
5393 | -- If a type support function is present (for complex cases), use it |
5394 | ||
fbf5a39b AC |
5395 | elsif Present (TSS (Root_Type (Typl), TSS_Composite_Equality)) then |
5396 | Build_Equality_Call | |
5397 | (TSS (Root_Type (Typl), TSS_Composite_Equality)); | |
70482933 RK |
5398 | |
5399 | -- Otherwise expand the component by component equality. Note that | |
8fc789c8 | 5400 | -- we never use block-bit comparisons for records, because of the |
70482933 RK |
5401 | -- problems with gaps. The backend will often be able to recombine |
5402 | -- the separate comparisons that we generate here. | |
5403 | ||
5404 | else | |
5405 | Remove_Side_Effects (Lhs); | |
5406 | Remove_Side_Effects (Rhs); | |
5407 | Rewrite (N, | |
5408 | Expand_Record_Equality (N, Typl, Lhs, Rhs, Bodies)); | |
5409 | ||
5410 | Insert_Actions (N, Bodies, Suppress => All_Checks); | |
5411 | Analyze_And_Resolve (N, Standard_Boolean, Suppress => All_Checks); | |
5412 | end if; | |
5413 | end if; | |
5414 | ||
d26dc4b5 | 5415 | -- Test if result is known at compile time |
70482933 | 5416 | |
d26dc4b5 | 5417 | Rewrite_Comparison (N); |
f02b8bb8 RD |
5418 | |
5419 | -- If we still have comparison for Vax_Float, process it | |
5420 | ||
5421 | if Vax_Float (Typl) and then Nkind (N) in N_Op_Compare then | |
5422 | Expand_Vax_Comparison (N); | |
5423 | return; | |
5424 | end if; | |
70482933 RK |
5425 | end Expand_N_Op_Eq; |
5426 | ||
5427 | ----------------------- | |
5428 | -- Expand_N_Op_Expon -- | |
5429 | ----------------------- | |
5430 | ||
5431 | procedure Expand_N_Op_Expon (N : Node_Id) is | |
5432 | Loc : constant Source_Ptr := Sloc (N); | |
5433 | Typ : constant Entity_Id := Etype (N); | |
5434 | Rtyp : constant Entity_Id := Root_Type (Typ); | |
5435 | Base : constant Node_Id := Relocate_Node (Left_Opnd (N)); | |
07fc65c4 | 5436 | Bastyp : constant Node_Id := Etype (Base); |
70482933 RK |
5437 | Exp : constant Node_Id := Relocate_Node (Right_Opnd (N)); |
5438 | Exptyp : constant Entity_Id := Etype (Exp); | |
5439 | Ovflo : constant Boolean := Do_Overflow_Check (N); | |
5440 | Expv : Uint; | |
5441 | Xnode : Node_Id; | |
5442 | Temp : Node_Id; | |
5443 | Rent : RE_Id; | |
5444 | Ent : Entity_Id; | |
fbf5a39b | 5445 | Etyp : Entity_Id; |
70482933 RK |
5446 | |
5447 | begin | |
5448 | Binary_Op_Validity_Checks (N); | |
5449 | ||
685094bf RD |
5450 | -- If either operand is of a private type, then we have the use of an |
5451 | -- intrinsic operator, and we get rid of the privateness, by using root | |
5452 | -- types of underlying types for the actual operation. Otherwise the | |
5453 | -- private types will cause trouble if we expand multiplications or | |
5454 | -- shifts etc. We also do this transformation if the result type is | |
5455 | -- different from the base type. | |
07fc65c4 GB |
5456 | |
5457 | if Is_Private_Type (Etype (Base)) | |
5458 | or else | |
5459 | Is_Private_Type (Typ) | |
5460 | or else | |
5461 | Is_Private_Type (Exptyp) | |
5462 | or else | |
5463 | Rtyp /= Root_Type (Bastyp) | |
5464 | then | |
5465 | declare | |
5466 | Bt : constant Entity_Id := Root_Type (Underlying_Type (Bastyp)); | |
5467 | Et : constant Entity_Id := Root_Type (Underlying_Type (Exptyp)); | |
5468 | ||
5469 | begin | |
5470 | Rewrite (N, | |
5471 | Unchecked_Convert_To (Typ, | |
5472 | Make_Op_Expon (Loc, | |
5473 | Left_Opnd => Unchecked_Convert_To (Bt, Base), | |
5474 | Right_Opnd => Unchecked_Convert_To (Et, Exp)))); | |
5475 | Analyze_And_Resolve (N, Typ); | |
5476 | return; | |
5477 | end; | |
5478 | end if; | |
5479 | ||
fbf5a39b | 5480 | -- Test for case of known right argument |
70482933 RK |
5481 | |
5482 | if Compile_Time_Known_Value (Exp) then | |
5483 | Expv := Expr_Value (Exp); | |
5484 | ||
5485 | -- We only fold small non-negative exponents. You might think we | |
5486 | -- could fold small negative exponents for the real case, but we | |
5487 | -- can't because we are required to raise Constraint_Error for | |
5488 | -- the case of 0.0 ** (negative) even if Machine_Overflows = False. | |
5489 | -- See ACVC test C4A012B. | |
5490 | ||
5491 | if Expv >= 0 and then Expv <= 4 then | |
5492 | ||
5493 | -- X ** 0 = 1 (or 1.0) | |
5494 | ||
5495 | if Expv = 0 then | |
abcbd24c ST |
5496 | |
5497 | -- Call Remove_Side_Effects to ensure that any side effects | |
5498 | -- in the ignored left operand (in particular function calls | |
5499 | -- to user defined functions) are properly executed. | |
5500 | ||
5501 | Remove_Side_Effects (Base); | |
5502 | ||
70482933 RK |
5503 | if Ekind (Typ) in Integer_Kind then |
5504 | Xnode := Make_Integer_Literal (Loc, Intval => 1); | |
5505 | else | |
5506 | Xnode := Make_Real_Literal (Loc, Ureal_1); | |
5507 | end if; | |
5508 | ||
5509 | -- X ** 1 = X | |
5510 | ||
5511 | elsif Expv = 1 then | |
5512 | Xnode := Base; | |
5513 | ||
5514 | -- X ** 2 = X * X | |
5515 | ||
5516 | elsif Expv = 2 then | |
5517 | Xnode := | |
5518 | Make_Op_Multiply (Loc, | |
5519 | Left_Opnd => Duplicate_Subexpr (Base), | |
fbf5a39b | 5520 | Right_Opnd => Duplicate_Subexpr_No_Checks (Base)); |
70482933 RK |
5521 | |
5522 | -- X ** 3 = X * X * X | |
5523 | ||
5524 | elsif Expv = 3 then | |
5525 | Xnode := | |
5526 | Make_Op_Multiply (Loc, | |
5527 | Left_Opnd => | |
5528 | Make_Op_Multiply (Loc, | |
5529 | Left_Opnd => Duplicate_Subexpr (Base), | |
fbf5a39b AC |
5530 | Right_Opnd => Duplicate_Subexpr_No_Checks (Base)), |
5531 | Right_Opnd => Duplicate_Subexpr_No_Checks (Base)); | |
70482933 RK |
5532 | |
5533 | -- X ** 4 -> | |
5534 | -- En : constant base'type := base * base; | |
5535 | -- ... | |
5536 | -- En * En | |
5537 | ||
5538 | else -- Expv = 4 | |
5539 | Temp := | |
5540 | Make_Defining_Identifier (Loc, New_Internal_Name ('E')); | |
5541 | ||
5542 | Insert_Actions (N, New_List ( | |
5543 | Make_Object_Declaration (Loc, | |
5544 | Defining_Identifier => Temp, | |
5545 | Constant_Present => True, | |
5546 | Object_Definition => New_Reference_To (Typ, Loc), | |
5547 | Expression => | |
5548 | Make_Op_Multiply (Loc, | |
5549 | Left_Opnd => Duplicate_Subexpr (Base), | |
fbf5a39b | 5550 | Right_Opnd => Duplicate_Subexpr_No_Checks (Base))))); |
70482933 RK |
5551 | |
5552 | Xnode := | |
5553 | Make_Op_Multiply (Loc, | |
5554 | Left_Opnd => New_Reference_To (Temp, Loc), | |
5555 | Right_Opnd => New_Reference_To (Temp, Loc)); | |
5556 | end if; | |
5557 | ||
5558 | Rewrite (N, Xnode); | |
5559 | Analyze_And_Resolve (N, Typ); | |
5560 | return; | |
5561 | end if; | |
5562 | end if; | |
5563 | ||
5564 | -- Case of (2 ** expression) appearing as an argument of an integer | |
5565 | -- multiplication, or as the right argument of a division of a non- | |
fbf5a39b | 5566 | -- negative integer. In such cases we leave the node untouched, setting |
70482933 RK |
5567 | -- the flag Is_Natural_Power_Of_2_for_Shift set, then the expansion |
5568 | -- of the higher level node converts it into a shift. | |
5569 | ||
685094bf RD |
5570 | -- Note: this transformation is not applicable for a modular type with |
5571 | -- a non-binary modulus in the multiplication case, since we get a wrong | |
5572 | -- result if the shift causes an overflow before the modular reduction. | |
5573 | ||
70482933 RK |
5574 | if Nkind (Base) = N_Integer_Literal |
5575 | and then Intval (Base) = 2 | |
5576 | and then Is_Integer_Type (Root_Type (Exptyp)) | |
5577 | and then Esize (Root_Type (Exptyp)) <= Esize (Standard_Integer) | |
5578 | and then Is_Unsigned_Type (Exptyp) | |
5579 | and then not Ovflo | |
5580 | and then Nkind (Parent (N)) in N_Binary_Op | |
5581 | then | |
5582 | declare | |
5583 | P : constant Node_Id := Parent (N); | |
5584 | L : constant Node_Id := Left_Opnd (P); | |
5585 | R : constant Node_Id := Right_Opnd (P); | |
5586 | ||
5587 | begin | |
5588 | if (Nkind (P) = N_Op_Multiply | |
685094bf | 5589 | and then not Non_Binary_Modulus (Typ) |
70482933 RK |
5590 | and then |
5591 | ((Is_Integer_Type (Etype (L)) and then R = N) | |
5592 | or else | |
5593 | (Is_Integer_Type (Etype (R)) and then L = N)) | |
5594 | and then not Do_Overflow_Check (P)) | |
5595 | ||
5596 | or else | |
5597 | (Nkind (P) = N_Op_Divide | |
5598 | and then Is_Integer_Type (Etype (L)) | |
5599 | and then Is_Unsigned_Type (Etype (L)) | |
5600 | and then R = N | |
5601 | and then not Do_Overflow_Check (P)) | |
5602 | then | |
5603 | Set_Is_Power_Of_2_For_Shift (N); | |
5604 | return; | |
5605 | end if; | |
5606 | end; | |
5607 | end if; | |
5608 | ||
07fc65c4 GB |
5609 | -- Fall through if exponentiation must be done using a runtime routine |
5610 | ||
07fc65c4 | 5611 | -- First deal with modular case |
70482933 RK |
5612 | |
5613 | if Is_Modular_Integer_Type (Rtyp) then | |
5614 | ||
5615 | -- Non-binary case, we call the special exponentiation routine for | |
5616 | -- the non-binary case, converting the argument to Long_Long_Integer | |
5617 | -- and passing the modulus value. Then the result is converted back | |
5618 | -- to the base type. | |
5619 | ||
5620 | if Non_Binary_Modulus (Rtyp) then | |
70482933 RK |
5621 | Rewrite (N, |
5622 | Convert_To (Typ, | |
5623 | Make_Function_Call (Loc, | |
5624 | Name => New_Reference_To (RTE (RE_Exp_Modular), Loc), | |
5625 | Parameter_Associations => New_List ( | |
5626 | Convert_To (Standard_Integer, Base), | |
5627 | Make_Integer_Literal (Loc, Modulus (Rtyp)), | |
5628 | Exp)))); | |
5629 | ||
685094bf RD |
5630 | -- Binary case, in this case, we call one of two routines, either the |
5631 | -- unsigned integer case, or the unsigned long long integer case, | |
5632 | -- with a final "and" operation to do the required mod. | |
70482933 RK |
5633 | |
5634 | else | |
5635 | if UI_To_Int (Esize (Rtyp)) <= Standard_Integer_Size then | |
5636 | Ent := RTE (RE_Exp_Unsigned); | |
5637 | else | |
5638 | Ent := RTE (RE_Exp_Long_Long_Unsigned); | |
5639 | end if; | |
5640 | ||
5641 | Rewrite (N, | |
5642 | Convert_To (Typ, | |
5643 | Make_Op_And (Loc, | |
5644 | Left_Opnd => | |
5645 | Make_Function_Call (Loc, | |
5646 | Name => New_Reference_To (Ent, Loc), | |
5647 | Parameter_Associations => New_List ( | |
5648 | Convert_To (Etype (First_Formal (Ent)), Base), | |
5649 | Exp)), | |
5650 | Right_Opnd => | |
5651 | Make_Integer_Literal (Loc, Modulus (Rtyp) - 1)))); | |
5652 | ||
5653 | end if; | |
5654 | ||
5655 | -- Common exit point for modular type case | |
5656 | ||
5657 | Analyze_And_Resolve (N, Typ); | |
5658 | return; | |
5659 | ||
fbf5a39b AC |
5660 | -- Signed integer cases, done using either Integer or Long_Long_Integer. |
5661 | -- It is not worth having routines for Short_[Short_]Integer, since for | |
5662 | -- most machines it would not help, and it would generate more code that | |
dfd99a80 | 5663 | -- might need certification when a certified run time is required. |
70482933 | 5664 | |
fbf5a39b | 5665 | -- In the integer cases, we have two routines, one for when overflow |
dfd99a80 TQ |
5666 | -- checks are required, and one when they are not required, since there |
5667 | -- is a real gain in omitting checks on many machines. | |
70482933 | 5668 | |
fbf5a39b AC |
5669 | elsif Rtyp = Base_Type (Standard_Long_Long_Integer) |
5670 | or else (Rtyp = Base_Type (Standard_Long_Integer) | |
5671 | and then | |
5672 | Esize (Standard_Long_Integer) > Esize (Standard_Integer)) | |
5673 | or else (Rtyp = Universal_Integer) | |
70482933 | 5674 | then |
fbf5a39b AC |
5675 | Etyp := Standard_Long_Long_Integer; |
5676 | ||
70482933 RK |
5677 | if Ovflo then |
5678 | Rent := RE_Exp_Long_Long_Integer; | |
5679 | else | |
5680 | Rent := RE_Exn_Long_Long_Integer; | |
5681 | end if; | |
5682 | ||
fbf5a39b AC |
5683 | elsif Is_Signed_Integer_Type (Rtyp) then |
5684 | Etyp := Standard_Integer; | |
70482933 RK |
5685 | |
5686 | if Ovflo then | |
fbf5a39b | 5687 | Rent := RE_Exp_Integer; |
70482933 | 5688 | else |
fbf5a39b | 5689 | Rent := RE_Exn_Integer; |
70482933 | 5690 | end if; |
fbf5a39b AC |
5691 | |
5692 | -- Floating-point cases, always done using Long_Long_Float. We do not | |
5693 | -- need separate routines for the overflow case here, since in the case | |
5694 | -- of floating-point, we generate infinities anyway as a rule (either | |
5695 | -- that or we automatically trap overflow), and if there is an infinity | |
5696 | -- generated and a range check is required, the check will fail anyway. | |
5697 | ||
5698 | else | |
5699 | pragma Assert (Is_Floating_Point_Type (Rtyp)); | |
5700 | Etyp := Standard_Long_Long_Float; | |
5701 | Rent := RE_Exn_Long_Long_Float; | |
70482933 RK |
5702 | end if; |
5703 | ||
5704 | -- Common processing for integer cases and floating-point cases. | |
fbf5a39b | 5705 | -- If we are in the right type, we can call runtime routine directly |
70482933 | 5706 | |
fbf5a39b | 5707 | if Typ = Etyp |
70482933 RK |
5708 | and then Rtyp /= Universal_Integer |
5709 | and then Rtyp /= Universal_Real | |
5710 | then | |
5711 | Rewrite (N, | |
5712 | Make_Function_Call (Loc, | |
5713 | Name => New_Reference_To (RTE (Rent), Loc), | |
5714 | Parameter_Associations => New_List (Base, Exp))); | |
5715 | ||
5716 | -- Otherwise we have to introduce conversions (conversions are also | |
fbf5a39b AC |
5717 | -- required in the universal cases, since the runtime routine is |
5718 | -- typed using one of the standard types. | |
70482933 RK |
5719 | |
5720 | else | |
5721 | Rewrite (N, | |
5722 | Convert_To (Typ, | |
5723 | Make_Function_Call (Loc, | |
5724 | Name => New_Reference_To (RTE (Rent), Loc), | |
5725 | Parameter_Associations => New_List ( | |
fbf5a39b | 5726 | Convert_To (Etyp, Base), |
70482933 RK |
5727 | Exp)))); |
5728 | end if; | |
5729 | ||
5730 | Analyze_And_Resolve (N, Typ); | |
5731 | return; | |
5732 | ||
fbf5a39b AC |
5733 | exception |
5734 | when RE_Not_Available => | |
5735 | return; | |
70482933 RK |
5736 | end Expand_N_Op_Expon; |
5737 | ||
5738 | -------------------- | |
5739 | -- Expand_N_Op_Ge -- | |
5740 | -------------------- | |
5741 | ||
5742 | procedure Expand_N_Op_Ge (N : Node_Id) is | |
5743 | Typ : constant Entity_Id := Etype (N); | |
5744 | Op1 : constant Node_Id := Left_Opnd (N); | |
5745 | Op2 : constant Node_Id := Right_Opnd (N); | |
5746 | Typ1 : constant Entity_Id := Base_Type (Etype (Op1)); | |
5747 | ||
5748 | begin | |
5749 | Binary_Op_Validity_Checks (N); | |
5750 | ||
f02b8bb8 | 5751 | if Is_Array_Type (Typ1) then |
70482933 RK |
5752 | Expand_Array_Comparison (N); |
5753 | return; | |
5754 | end if; | |
5755 | ||
5756 | if Is_Boolean_Type (Typ1) then | |
5757 | Adjust_Condition (Op1); | |
5758 | Adjust_Condition (Op2); | |
5759 | Set_Etype (N, Standard_Boolean); | |
5760 | Adjust_Result_Type (N, Typ); | |
5761 | end if; | |
5762 | ||
5763 | Rewrite_Comparison (N); | |
f02b8bb8 RD |
5764 | |
5765 | -- If we still have comparison, and Vax_Float type, process it | |
5766 | ||
5767 | if Vax_Float (Typ1) and then Nkind (N) in N_Op_Compare then | |
5768 | Expand_Vax_Comparison (N); | |
5769 | return; | |
5770 | end if; | |
70482933 RK |
5771 | end Expand_N_Op_Ge; |
5772 | ||
5773 | -------------------- | |
5774 | -- Expand_N_Op_Gt -- | |
5775 | -------------------- | |
5776 | ||
5777 | procedure Expand_N_Op_Gt (N : Node_Id) is | |
5778 | Typ : constant Entity_Id := Etype (N); | |
5779 | Op1 : constant Node_Id := Left_Opnd (N); | |
5780 | Op2 : constant Node_Id := Right_Opnd (N); | |
5781 | Typ1 : constant Entity_Id := Base_Type (Etype (Op1)); | |
5782 | ||
5783 | begin | |
5784 | Binary_Op_Validity_Checks (N); | |
5785 | ||
f02b8bb8 | 5786 | if Is_Array_Type (Typ1) then |
70482933 RK |
5787 | Expand_Array_Comparison (N); |
5788 | return; | |
5789 | end if; | |
5790 | ||
5791 | if Is_Boolean_Type (Typ1) then | |
5792 | Adjust_Condition (Op1); | |
5793 | Adjust_Condition (Op2); | |
5794 | Set_Etype (N, Standard_Boolean); | |
5795 | Adjust_Result_Type (N, Typ); | |
5796 | end if; | |
5797 | ||
5798 | Rewrite_Comparison (N); | |
f02b8bb8 RD |
5799 | |
5800 | -- If we still have comparison, and Vax_Float type, process it | |
5801 | ||
5802 | if Vax_Float (Typ1) and then Nkind (N) in N_Op_Compare then | |
5803 | Expand_Vax_Comparison (N); | |
5804 | return; | |
5805 | end if; | |
70482933 RK |
5806 | end Expand_N_Op_Gt; |
5807 | ||
5808 | -------------------- | |
5809 | -- Expand_N_Op_Le -- | |
5810 | -------------------- | |
5811 | ||
5812 | procedure Expand_N_Op_Le (N : Node_Id) is | |
5813 | Typ : constant Entity_Id := Etype (N); | |
5814 | Op1 : constant Node_Id := Left_Opnd (N); | |
5815 | Op2 : constant Node_Id := Right_Opnd (N); | |
5816 | Typ1 : constant Entity_Id := Base_Type (Etype (Op1)); | |
5817 | ||
5818 | begin | |
5819 | Binary_Op_Validity_Checks (N); | |
5820 | ||
f02b8bb8 | 5821 | if Is_Array_Type (Typ1) then |
70482933 RK |
5822 | Expand_Array_Comparison (N); |
5823 | return; | |
5824 | end if; | |
5825 | ||
5826 | if Is_Boolean_Type (Typ1) then | |
5827 | Adjust_Condition (Op1); | |
5828 | Adjust_Condition (Op2); | |
5829 | Set_Etype (N, Standard_Boolean); | |
5830 | Adjust_Result_Type (N, Typ); | |
5831 | end if; | |
5832 | ||
5833 | Rewrite_Comparison (N); | |
f02b8bb8 RD |
5834 | |
5835 | -- If we still have comparison, and Vax_Float type, process it | |
5836 | ||
5837 | if Vax_Float (Typ1) and then Nkind (N) in N_Op_Compare then | |
5838 | Expand_Vax_Comparison (N); | |
5839 | return; | |
5840 | end if; | |
70482933 RK |
5841 | end Expand_N_Op_Le; |
5842 | ||
5843 | -------------------- | |
5844 | -- Expand_N_Op_Lt -- | |
5845 | -------------------- | |
5846 | ||
5847 | procedure Expand_N_Op_Lt (N : Node_Id) is | |
5848 | Typ : constant Entity_Id := Etype (N); | |
5849 | Op1 : constant Node_Id := Left_Opnd (N); | |
5850 | Op2 : constant Node_Id := Right_Opnd (N); | |
5851 | Typ1 : constant Entity_Id := Base_Type (Etype (Op1)); | |
5852 | ||
5853 | begin | |
5854 | Binary_Op_Validity_Checks (N); | |
5855 | ||
f02b8bb8 | 5856 | if Is_Array_Type (Typ1) then |
70482933 RK |
5857 | Expand_Array_Comparison (N); |
5858 | return; | |
5859 | end if; | |
5860 | ||
5861 | if Is_Boolean_Type (Typ1) then | |
5862 | Adjust_Condition (Op1); | |
5863 | Adjust_Condition (Op2); | |
5864 | Set_Etype (N, Standard_Boolean); | |
5865 | Adjust_Result_Type (N, Typ); | |
5866 | end if; | |
5867 | ||
5868 | Rewrite_Comparison (N); | |
f02b8bb8 RD |
5869 | |
5870 | -- If we still have comparison, and Vax_Float type, process it | |
5871 | ||
5872 | if Vax_Float (Typ1) and then Nkind (N) in N_Op_Compare then | |
5873 | Expand_Vax_Comparison (N); | |
5874 | return; | |
5875 | end if; | |
70482933 RK |
5876 | end Expand_N_Op_Lt; |
5877 | ||
5878 | ----------------------- | |
5879 | -- Expand_N_Op_Minus -- | |
5880 | ----------------------- | |
5881 | ||
5882 | procedure Expand_N_Op_Minus (N : Node_Id) is | |
5883 | Loc : constant Source_Ptr := Sloc (N); | |
5884 | Typ : constant Entity_Id := Etype (N); | |
5885 | ||
5886 | begin | |
5887 | Unary_Op_Validity_Checks (N); | |
5888 | ||
07fc65c4 | 5889 | if not Backend_Overflow_Checks_On_Target |
70482933 RK |
5890 | and then Is_Signed_Integer_Type (Etype (N)) |
5891 | and then Do_Overflow_Check (N) | |
5892 | then | |
5893 | -- Software overflow checking expands -expr into (0 - expr) | |
5894 | ||
5895 | Rewrite (N, | |
5896 | Make_Op_Subtract (Loc, | |
5897 | Left_Opnd => Make_Integer_Literal (Loc, 0), | |
5898 | Right_Opnd => Right_Opnd (N))); | |
5899 | ||
5900 | Analyze_And_Resolve (N, Typ); | |
5901 | ||
5902 | -- Vax floating-point types case | |
5903 | ||
5904 | elsif Vax_Float (Etype (N)) then | |
5905 | Expand_Vax_Arith (N); | |
5906 | end if; | |
5907 | end Expand_N_Op_Minus; | |
5908 | ||
5909 | --------------------- | |
5910 | -- Expand_N_Op_Mod -- | |
5911 | --------------------- | |
5912 | ||
5913 | procedure Expand_N_Op_Mod (N : Node_Id) is | |
5914 | Loc : constant Source_Ptr := Sloc (N); | |
fbf5a39b | 5915 | Typ : constant Entity_Id := Etype (N); |
70482933 RK |
5916 | Left : constant Node_Id := Left_Opnd (N); |
5917 | Right : constant Node_Id := Right_Opnd (N); | |
5918 | DOC : constant Boolean := Do_Overflow_Check (N); | |
5919 | DDC : constant Boolean := Do_Division_Check (N); | |
5920 | ||
5921 | LLB : Uint; | |
5922 | Llo : Uint; | |
5923 | Lhi : Uint; | |
5924 | LOK : Boolean; | |
5925 | Rlo : Uint; | |
5926 | Rhi : Uint; | |
5927 | ROK : Boolean; | |
5928 | ||
1033834f RD |
5929 | pragma Warnings (Off, Lhi); |
5930 | ||
70482933 RK |
5931 | begin |
5932 | Binary_Op_Validity_Checks (N); | |
5933 | ||
5934 | Determine_Range (Right, ROK, Rlo, Rhi); | |
5935 | Determine_Range (Left, LOK, Llo, Lhi); | |
5936 | ||
5937 | -- Convert mod to rem if operands are known non-negative. We do this | |
5938 | -- since it is quite likely that this will improve the quality of code, | |
5939 | -- (the operation now corresponds to the hardware remainder), and it | |
5940 | -- does not seem likely that it could be harmful. | |
5941 | ||
5942 | if LOK and then Llo >= 0 | |
5943 | and then | |
5944 | ROK and then Rlo >= 0 | |
5945 | then | |
5946 | Rewrite (N, | |
5947 | Make_Op_Rem (Sloc (N), | |
5948 | Left_Opnd => Left_Opnd (N), | |
5949 | Right_Opnd => Right_Opnd (N))); | |
5950 | ||
685094bf RD |
5951 | -- Instead of reanalyzing the node we do the analysis manually. This |
5952 | -- avoids anomalies when the replacement is done in an instance and | |
5953 | -- is epsilon more efficient. | |
70482933 RK |
5954 | |
5955 | Set_Entity (N, Standard_Entity (S_Op_Rem)); | |
fbf5a39b | 5956 | Set_Etype (N, Typ); |
70482933 RK |
5957 | Set_Do_Overflow_Check (N, DOC); |
5958 | Set_Do_Division_Check (N, DDC); | |
5959 | Expand_N_Op_Rem (N); | |
5960 | Set_Analyzed (N); | |
5961 | ||
5962 | -- Otherwise, normal mod processing | |
5963 | ||
5964 | else | |
5965 | if Is_Integer_Type (Etype (N)) then | |
5966 | Apply_Divide_Check (N); | |
5967 | end if; | |
5968 | ||
fbf5a39b AC |
5969 | -- Apply optimization x mod 1 = 0. We don't really need that with |
5970 | -- gcc, but it is useful with other back ends (e.g. AAMP), and is | |
5971 | -- certainly harmless. | |
5972 | ||
5973 | if Is_Integer_Type (Etype (N)) | |
5974 | and then Compile_Time_Known_Value (Right) | |
5975 | and then Expr_Value (Right) = Uint_1 | |
5976 | then | |
abcbd24c ST |
5977 | -- Call Remove_Side_Effects to ensure that any side effects in |
5978 | -- the ignored left operand (in particular function calls to | |
5979 | -- user defined functions) are properly executed. | |
5980 | ||
5981 | Remove_Side_Effects (Left); | |
5982 | ||
fbf5a39b AC |
5983 | Rewrite (N, Make_Integer_Literal (Loc, 0)); |
5984 | Analyze_And_Resolve (N, Typ); | |
5985 | return; | |
5986 | end if; | |
5987 | ||
70482933 RK |
5988 | -- Deal with annoying case of largest negative number remainder |
5989 | -- minus one. Gigi does not handle this case correctly, because | |
5990 | -- it generates a divide instruction which may trap in this case. | |
5991 | ||
685094bf RD |
5992 | -- In fact the check is quite easy, if the right operand is -1, then |
5993 | -- the mod value is always 0, and we can just ignore the left operand | |
5994 | -- completely in this case. | |
70482933 | 5995 | |
30783513 | 5996 | -- The operand type may be private (e.g. in the expansion of an |
685094bf RD |
5997 | -- intrinsic operation) so we must use the underlying type to get the |
5998 | -- bounds, and convert the literals explicitly. | |
fbf5a39b AC |
5999 | |
6000 | LLB := | |
6001 | Expr_Value | |
6002 | (Type_Low_Bound (Base_Type (Underlying_Type (Etype (Left))))); | |
70482933 RK |
6003 | |
6004 | if ((not ROK) or else (Rlo <= (-1) and then (-1) <= Rhi)) | |
6005 | and then | |
6006 | ((not LOK) or else (Llo = LLB)) | |
6007 | then | |
6008 | Rewrite (N, | |
6009 | Make_Conditional_Expression (Loc, | |
6010 | Expressions => New_List ( | |
6011 | Make_Op_Eq (Loc, | |
6012 | Left_Opnd => Duplicate_Subexpr (Right), | |
6013 | Right_Opnd => | |
fbf5a39b AC |
6014 | Unchecked_Convert_To (Typ, |
6015 | Make_Integer_Literal (Loc, -1))), | |
6016 | Unchecked_Convert_To (Typ, | |
6017 | Make_Integer_Literal (Loc, Uint_0)), | |
70482933 RK |
6018 | Relocate_Node (N)))); |
6019 | ||
6020 | Set_Analyzed (Next (Next (First (Expressions (N))))); | |
fbf5a39b | 6021 | Analyze_And_Resolve (N, Typ); |
70482933 RK |
6022 | end if; |
6023 | end if; | |
6024 | end Expand_N_Op_Mod; | |
6025 | ||
6026 | -------------------------- | |
6027 | -- Expand_N_Op_Multiply -- | |
6028 | -------------------------- | |
6029 | ||
6030 | procedure Expand_N_Op_Multiply (N : Node_Id) is | |
abcbd24c ST |
6031 | Loc : constant Source_Ptr := Sloc (N); |
6032 | Lop : constant Node_Id := Left_Opnd (N); | |
6033 | Rop : constant Node_Id := Right_Opnd (N); | |
fbf5a39b | 6034 | |
abcbd24c ST |
6035 | Lp2 : constant Boolean := |
6036 | Nkind (Lop) = N_Op_Expon | |
6037 | and then Is_Power_Of_2_For_Shift (Lop); | |
fbf5a39b | 6038 | |
abcbd24c ST |
6039 | Rp2 : constant Boolean := |
6040 | Nkind (Rop) = N_Op_Expon | |
6041 | and then Is_Power_Of_2_For_Shift (Rop); | |
fbf5a39b | 6042 | |
70482933 RK |
6043 | Ltyp : constant Entity_Id := Etype (Lop); |
6044 | Rtyp : constant Entity_Id := Etype (Rop); | |
6045 | Typ : Entity_Id := Etype (N); | |
6046 | ||
6047 | begin | |
6048 | Binary_Op_Validity_Checks (N); | |
6049 | ||
6050 | -- Special optimizations for integer types | |
6051 | ||
6052 | if Is_Integer_Type (Typ) then | |
6053 | ||
abcbd24c | 6054 | -- N * 0 = 0 for integer types |
70482933 | 6055 | |
abcbd24c ST |
6056 | if Compile_Time_Known_Value (Rop) |
6057 | and then Expr_Value (Rop) = Uint_0 | |
70482933 | 6058 | then |
abcbd24c ST |
6059 | -- Call Remove_Side_Effects to ensure that any side effects in |
6060 | -- the ignored left operand (in particular function calls to | |
6061 | -- user defined functions) are properly executed. | |
6062 | ||
6063 | Remove_Side_Effects (Lop); | |
6064 | ||
6065 | Rewrite (N, Make_Integer_Literal (Loc, Uint_0)); | |
6066 | Analyze_And_Resolve (N, Typ); | |
6067 | return; | |
6068 | end if; | |
6069 | ||
6070 | -- Similar handling for 0 * N = 0 | |
6071 | ||
6072 | if Compile_Time_Known_Value (Lop) | |
6073 | and then Expr_Value (Lop) = Uint_0 | |
6074 | then | |
6075 | Remove_Side_Effects (Rop); | |
70482933 RK |
6076 | Rewrite (N, Make_Integer_Literal (Loc, Uint_0)); |
6077 | Analyze_And_Resolve (N, Typ); | |
6078 | return; | |
6079 | end if; | |
6080 | ||
6081 | -- N * 1 = 1 * N = N for integer types | |
6082 | ||
fbf5a39b AC |
6083 | -- This optimisation is not done if we are going to |
6084 | -- rewrite the product 1 * 2 ** N to a shift. | |
6085 | ||
6086 | if Compile_Time_Known_Value (Rop) | |
6087 | and then Expr_Value (Rop) = Uint_1 | |
6088 | and then not Lp2 | |
70482933 | 6089 | then |
fbf5a39b | 6090 | Rewrite (N, Lop); |
70482933 RK |
6091 | return; |
6092 | ||
fbf5a39b AC |
6093 | elsif Compile_Time_Known_Value (Lop) |
6094 | and then Expr_Value (Lop) = Uint_1 | |
6095 | and then not Rp2 | |
70482933 | 6096 | then |
fbf5a39b | 6097 | Rewrite (N, Rop); |
70482933 RK |
6098 | return; |
6099 | end if; | |
6100 | end if; | |
6101 | ||
70482933 RK |
6102 | -- Convert x * 2 ** y to Shift_Left (x, y). Note that the fact that |
6103 | -- Is_Power_Of_2_For_Shift is set means that we know that our left | |
6104 | -- operand is an integer, as required for this to work. | |
6105 | ||
fbf5a39b AC |
6106 | if Rp2 then |
6107 | if Lp2 then | |
70482933 | 6108 | |
fbf5a39b | 6109 | -- Convert 2 ** A * 2 ** B into 2 ** (A + B) |
70482933 RK |
6110 | |
6111 | Rewrite (N, | |
6112 | Make_Op_Expon (Loc, | |
6113 | Left_Opnd => Make_Integer_Literal (Loc, 2), | |
6114 | Right_Opnd => | |
6115 | Make_Op_Add (Loc, | |
6116 | Left_Opnd => Right_Opnd (Lop), | |
6117 | Right_Opnd => Right_Opnd (Rop)))); | |
6118 | Analyze_And_Resolve (N, Typ); | |
6119 | return; | |
6120 | ||
6121 | else | |
6122 | Rewrite (N, | |
6123 | Make_Op_Shift_Left (Loc, | |
6124 | Left_Opnd => Lop, | |
6125 | Right_Opnd => | |
6126 | Convert_To (Standard_Natural, Right_Opnd (Rop)))); | |
6127 | Analyze_And_Resolve (N, Typ); | |
6128 | return; | |
6129 | end if; | |
6130 | ||
6131 | -- Same processing for the operands the other way round | |
6132 | ||
fbf5a39b | 6133 | elsif Lp2 then |
70482933 RK |
6134 | Rewrite (N, |
6135 | Make_Op_Shift_Left (Loc, | |
6136 | Left_Opnd => Rop, | |
6137 | Right_Opnd => | |
6138 | Convert_To (Standard_Natural, Right_Opnd (Lop)))); | |
6139 | Analyze_And_Resolve (N, Typ); | |
6140 | return; | |
6141 | end if; | |
6142 | ||
6143 | -- Do required fixup of universal fixed operation | |
6144 | ||
6145 | if Typ = Universal_Fixed then | |
6146 | Fixup_Universal_Fixed_Operation (N); | |
6147 | Typ := Etype (N); | |
6148 | end if; | |
6149 | ||
6150 | -- Multiplications with fixed-point results | |
6151 | ||
6152 | if Is_Fixed_Point_Type (Typ) then | |
6153 | ||
685094bf RD |
6154 | -- No special processing if Treat_Fixed_As_Integer is set, since from |
6155 | -- a semantic point of view such operations are simply integer | |
6156 | -- operations and will be treated that way. | |
70482933 RK |
6157 | |
6158 | if not Treat_Fixed_As_Integer (N) then | |
6159 | ||
6160 | -- Case of fixed * integer => fixed | |
6161 | ||
6162 | if Is_Integer_Type (Rtyp) then | |
6163 | Expand_Multiply_Fixed_By_Integer_Giving_Fixed (N); | |
6164 | ||
6165 | -- Case of integer * fixed => fixed | |
6166 | ||
6167 | elsif Is_Integer_Type (Ltyp) then | |
6168 | Expand_Multiply_Integer_By_Fixed_Giving_Fixed (N); | |
6169 | ||
6170 | -- Case of fixed * fixed => fixed | |
6171 | ||
6172 | else | |
6173 | Expand_Multiply_Fixed_By_Fixed_Giving_Fixed (N); | |
6174 | end if; | |
6175 | end if; | |
6176 | ||
685094bf RD |
6177 | -- Other cases of multiplication of fixed-point operands. Again we |
6178 | -- exclude the cases where Treat_Fixed_As_Integer flag is set. | |
70482933 RK |
6179 | |
6180 | elsif (Is_Fixed_Point_Type (Ltyp) or else Is_Fixed_Point_Type (Rtyp)) | |
6181 | and then not Treat_Fixed_As_Integer (N) | |
6182 | then | |
6183 | if Is_Integer_Type (Typ) then | |
6184 | Expand_Multiply_Fixed_By_Fixed_Giving_Integer (N); | |
6185 | else | |
6186 | pragma Assert (Is_Floating_Point_Type (Typ)); | |
6187 | Expand_Multiply_Fixed_By_Fixed_Giving_Float (N); | |
6188 | end if; | |
6189 | ||
685094bf RD |
6190 | -- Mixed-mode operations can appear in a non-static universal context, |
6191 | -- in which case the integer argument must be converted explicitly. | |
70482933 RK |
6192 | |
6193 | elsif Typ = Universal_Real | |
6194 | and then Is_Integer_Type (Rtyp) | |
6195 | then | |
6196 | Rewrite (Rop, Convert_To (Universal_Real, Relocate_Node (Rop))); | |
6197 | ||
6198 | Analyze_And_Resolve (Rop, Universal_Real); | |
6199 | ||
6200 | elsif Typ = Universal_Real | |
6201 | and then Is_Integer_Type (Ltyp) | |
6202 | then | |
6203 | Rewrite (Lop, Convert_To (Universal_Real, Relocate_Node (Lop))); | |
6204 | ||
6205 | Analyze_And_Resolve (Lop, Universal_Real); | |
6206 | ||
6207 | -- Non-fixed point cases, check software overflow checking required | |
6208 | ||
6209 | elsif Is_Signed_Integer_Type (Etype (N)) then | |
6210 | Apply_Arithmetic_Overflow_Check (N); | |
f02b8bb8 RD |
6211 | |
6212 | -- Deal with VAX float case | |
6213 | ||
6214 | elsif Vax_Float (Typ) then | |
6215 | Expand_Vax_Arith (N); | |
6216 | return; | |
70482933 RK |
6217 | end if; |
6218 | end Expand_N_Op_Multiply; | |
6219 | ||
6220 | -------------------- | |
6221 | -- Expand_N_Op_Ne -- | |
6222 | -------------------- | |
6223 | ||
70482933 | 6224 | procedure Expand_N_Op_Ne (N : Node_Id) is |
f02b8bb8 | 6225 | Typ : constant Entity_Id := Etype (Left_Opnd (N)); |
70482933 RK |
6226 | |
6227 | begin | |
f02b8bb8 | 6228 | -- Case of elementary type with standard operator |
70482933 | 6229 | |
f02b8bb8 RD |
6230 | if Is_Elementary_Type (Typ) |
6231 | and then Sloc (Entity (N)) = Standard_Location | |
6232 | then | |
6233 | Binary_Op_Validity_Checks (N); | |
70482933 | 6234 | |
f02b8bb8 | 6235 | -- Boolean types (requiring handling of non-standard case) |
70482933 | 6236 | |
f02b8bb8 RD |
6237 | if Is_Boolean_Type (Typ) then |
6238 | Adjust_Condition (Left_Opnd (N)); | |
6239 | Adjust_Condition (Right_Opnd (N)); | |
6240 | Set_Etype (N, Standard_Boolean); | |
6241 | Adjust_Result_Type (N, Typ); | |
6242 | end if; | |
fbf5a39b | 6243 | |
f02b8bb8 RD |
6244 | Rewrite_Comparison (N); |
6245 | ||
6246 | -- If we still have comparison for Vax_Float, process it | |
6247 | ||
6248 | if Vax_Float (Typ) and then Nkind (N) in N_Op_Compare then | |
6249 | Expand_Vax_Comparison (N); | |
6250 | return; | |
6251 | end if; | |
6252 | ||
6253 | -- For all cases other than elementary types, we rewrite node as the | |
6254 | -- negation of an equality operation, and reanalyze. The equality to be | |
6255 | -- used is defined in the same scope and has the same signature. This | |
6256 | -- signature must be set explicitly since in an instance it may not have | |
6257 | -- the same visibility as in the generic unit. This avoids duplicating | |
6258 | -- or factoring the complex code for record/array equality tests etc. | |
6259 | ||
6260 | else | |
6261 | declare | |
6262 | Loc : constant Source_Ptr := Sloc (N); | |
6263 | Neg : Node_Id; | |
6264 | Ne : constant Entity_Id := Entity (N); | |
6265 | ||
6266 | begin | |
6267 | Binary_Op_Validity_Checks (N); | |
6268 | ||
6269 | Neg := | |
6270 | Make_Op_Not (Loc, | |
6271 | Right_Opnd => | |
6272 | Make_Op_Eq (Loc, | |
6273 | Left_Opnd => Left_Opnd (N), | |
6274 | Right_Opnd => Right_Opnd (N))); | |
6275 | Set_Paren_Count (Right_Opnd (Neg), 1); | |
6276 | ||
6277 | if Scope (Ne) /= Standard_Standard then | |
6278 | Set_Entity (Right_Opnd (Neg), Corresponding_Equality (Ne)); | |
6279 | end if; | |
6280 | ||
6281 | -- For navigation purposes, the inequality is treated as an | |
6282 | -- implicit reference to the corresponding equality. Preserve the | |
6283 | -- Comes_From_ source flag so that the proper Xref entry is | |
6284 | -- generated. | |
6285 | ||
6286 | Preserve_Comes_From_Source (Neg, N); | |
6287 | Preserve_Comes_From_Source (Right_Opnd (Neg), N); | |
6288 | Rewrite (N, Neg); | |
6289 | Analyze_And_Resolve (N, Standard_Boolean); | |
6290 | end; | |
6291 | end if; | |
70482933 RK |
6292 | end Expand_N_Op_Ne; |
6293 | ||
6294 | --------------------- | |
6295 | -- Expand_N_Op_Not -- | |
6296 | --------------------- | |
6297 | ||
685094bf RD |
6298 | -- If the argument is other than a Boolean array type, there is no special |
6299 | -- expansion required. | |
70482933 RK |
6300 | |
6301 | -- For the packed case, we call the special routine in Exp_Pakd, except | |
6302 | -- that if the component size is greater than one, we use the standard | |
6303 | -- routine generating a gruesome loop (it is so peculiar to have packed | |
685094bf RD |
6304 | -- arrays with non-standard Boolean representations anyway, so it does not |
6305 | -- matter that we do not handle this case efficiently). | |
70482933 | 6306 | |
685094bf RD |
6307 | -- For the unpacked case (and for the special packed case where we have non |
6308 | -- standard Booleans, as discussed above), we generate and insert into the | |
6309 | -- tree the following function definition: | |
70482933 RK |
6310 | |
6311 | -- function Nnnn (A : arr) is | |
6312 | -- B : arr; | |
6313 | -- begin | |
6314 | -- for J in a'range loop | |
6315 | -- B (J) := not A (J); | |
6316 | -- end loop; | |
6317 | -- return B; | |
6318 | -- end Nnnn; | |
6319 | ||
6320 | -- Here arr is the actual subtype of the parameter (and hence always | |
6321 | -- constrained). Then we replace the not with a call to this function. | |
6322 | ||
6323 | procedure Expand_N_Op_Not (N : Node_Id) is | |
6324 | Loc : constant Source_Ptr := Sloc (N); | |
6325 | Typ : constant Entity_Id := Etype (N); | |
6326 | Opnd : Node_Id; | |
6327 | Arr : Entity_Id; | |
6328 | A : Entity_Id; | |
6329 | B : Entity_Id; | |
6330 | J : Entity_Id; | |
6331 | A_J : Node_Id; | |
6332 | B_J : Node_Id; | |
6333 | ||
6334 | Func_Name : Entity_Id; | |
6335 | Loop_Statement : Node_Id; | |
6336 | ||
6337 | begin | |
6338 | Unary_Op_Validity_Checks (N); | |
6339 | ||
6340 | -- For boolean operand, deal with non-standard booleans | |
6341 | ||
6342 | if Is_Boolean_Type (Typ) then | |
6343 | Adjust_Condition (Right_Opnd (N)); | |
6344 | Set_Etype (N, Standard_Boolean); | |
6345 | Adjust_Result_Type (N, Typ); | |
6346 | return; | |
6347 | end if; | |
6348 | ||
6349 | -- Only array types need any other processing | |
6350 | ||
6351 | if not Is_Array_Type (Typ) then | |
6352 | return; | |
6353 | end if; | |
6354 | ||
a9d8907c JM |
6355 | -- Case of array operand. If bit packed with a component size of 1, |
6356 | -- handle it in Exp_Pakd if the operand is known to be aligned. | |
70482933 | 6357 | |
a9d8907c JM |
6358 | if Is_Bit_Packed_Array (Typ) |
6359 | and then Component_Size (Typ) = 1 | |
6360 | and then not Is_Possibly_Unaligned_Object (Right_Opnd (N)) | |
6361 | then | |
70482933 RK |
6362 | Expand_Packed_Not (N); |
6363 | return; | |
6364 | end if; | |
6365 | ||
fbf5a39b AC |
6366 | -- Case of array operand which is not bit-packed. If the context is |
6367 | -- a safe assignment, call in-place operation, If context is a larger | |
6368 | -- boolean expression in the context of a safe assignment, expansion is | |
6369 | -- done by enclosing operation. | |
70482933 RK |
6370 | |
6371 | Opnd := Relocate_Node (Right_Opnd (N)); | |
6372 | Convert_To_Actual_Subtype (Opnd); | |
6373 | Arr := Etype (Opnd); | |
6374 | Ensure_Defined (Arr, N); | |
b4592168 | 6375 | Silly_Boolean_Array_Not_Test (N, Arr); |
70482933 | 6376 | |
fbf5a39b AC |
6377 | if Nkind (Parent (N)) = N_Assignment_Statement then |
6378 | if Safe_In_Place_Array_Op (Name (Parent (N)), N, Empty) then | |
6379 | Build_Boolean_Array_Proc_Call (Parent (N), Opnd, Empty); | |
6380 | return; | |
6381 | ||
5e1c00fa | 6382 | -- Special case the negation of a binary operation |
fbf5a39b | 6383 | |
303b4d58 | 6384 | elsif Nkind_In (Opnd, N_Op_And, N_Op_Or, N_Op_Xor) |
fbf5a39b | 6385 | and then Safe_In_Place_Array_Op |
303b4d58 | 6386 | (Name (Parent (N)), Left_Opnd (Opnd), Right_Opnd (Opnd)) |
fbf5a39b AC |
6387 | then |
6388 | Build_Boolean_Array_Proc_Call (Parent (N), Opnd, Empty); | |
6389 | return; | |
6390 | end if; | |
6391 | ||
6392 | elsif Nkind (Parent (N)) in N_Binary_Op | |
6393 | and then Nkind (Parent (Parent (N))) = N_Assignment_Statement | |
6394 | then | |
6395 | declare | |
6396 | Op1 : constant Node_Id := Left_Opnd (Parent (N)); | |
6397 | Op2 : constant Node_Id := Right_Opnd (Parent (N)); | |
6398 | Lhs : constant Node_Id := Name (Parent (Parent (N))); | |
6399 | ||
6400 | begin | |
6401 | if Safe_In_Place_Array_Op (Lhs, Op1, Op2) then | |
6402 | if N = Op1 | |
6403 | and then Nkind (Op2) = N_Op_Not | |
6404 | then | |
5e1c00fa | 6405 | -- (not A) op (not B) can be reduced to a single call |
fbf5a39b AC |
6406 | |
6407 | return; | |
6408 | ||
6409 | elsif N = Op2 | |
6410 | and then Nkind (Parent (N)) = N_Op_Xor | |
6411 | then | |
5e1c00fa | 6412 | -- A xor (not B) can also be special-cased |
fbf5a39b AC |
6413 | |
6414 | return; | |
6415 | end if; | |
6416 | end if; | |
6417 | end; | |
6418 | end if; | |
6419 | ||
70482933 RK |
6420 | A := Make_Defining_Identifier (Loc, Name_uA); |
6421 | B := Make_Defining_Identifier (Loc, Name_uB); | |
6422 | J := Make_Defining_Identifier (Loc, Name_uJ); | |
6423 | ||
6424 | A_J := | |
6425 | Make_Indexed_Component (Loc, | |
6426 | Prefix => New_Reference_To (A, Loc), | |
6427 | Expressions => New_List (New_Reference_To (J, Loc))); | |
6428 | ||
6429 | B_J := | |
6430 | Make_Indexed_Component (Loc, | |
6431 | Prefix => New_Reference_To (B, Loc), | |
6432 | Expressions => New_List (New_Reference_To (J, Loc))); | |
6433 | ||
6434 | Loop_Statement := | |
6435 | Make_Implicit_Loop_Statement (N, | |
6436 | Identifier => Empty, | |
6437 | ||
6438 | Iteration_Scheme => | |
6439 | Make_Iteration_Scheme (Loc, | |
6440 | Loop_Parameter_Specification => | |
6441 | Make_Loop_Parameter_Specification (Loc, | |
6442 | Defining_Identifier => J, | |
6443 | Discrete_Subtype_Definition => | |
6444 | Make_Attribute_Reference (Loc, | |
6445 | Prefix => Make_Identifier (Loc, Chars (A)), | |
6446 | Attribute_Name => Name_Range))), | |
6447 | ||
6448 | Statements => New_List ( | |
6449 | Make_Assignment_Statement (Loc, | |
6450 | Name => B_J, | |
6451 | Expression => Make_Op_Not (Loc, A_J)))); | |
6452 | ||
6453 | Func_Name := Make_Defining_Identifier (Loc, New_Internal_Name ('N')); | |
6454 | Set_Is_Inlined (Func_Name); | |
6455 | ||
6456 | Insert_Action (N, | |
6457 | Make_Subprogram_Body (Loc, | |
6458 | Specification => | |
6459 | Make_Function_Specification (Loc, | |
6460 | Defining_Unit_Name => Func_Name, | |
6461 | Parameter_Specifications => New_List ( | |
6462 | Make_Parameter_Specification (Loc, | |
6463 | Defining_Identifier => A, | |
6464 | Parameter_Type => New_Reference_To (Typ, Loc))), | |
630d30e9 | 6465 | Result_Definition => New_Reference_To (Typ, Loc)), |
70482933 RK |
6466 | |
6467 | Declarations => New_List ( | |
6468 | Make_Object_Declaration (Loc, | |
6469 | Defining_Identifier => B, | |
6470 | Object_Definition => New_Reference_To (Arr, Loc))), | |
6471 | ||
6472 | Handled_Statement_Sequence => | |
6473 | Make_Handled_Sequence_Of_Statements (Loc, | |
6474 | Statements => New_List ( | |
6475 | Loop_Statement, | |
d766cee3 | 6476 | Make_Simple_Return_Statement (Loc, |
70482933 RK |
6477 | Expression => |
6478 | Make_Identifier (Loc, Chars (B))))))); | |
6479 | ||
6480 | Rewrite (N, | |
6481 | Make_Function_Call (Loc, | |
6482 | Name => New_Reference_To (Func_Name, Loc), | |
6483 | Parameter_Associations => New_List (Opnd))); | |
6484 | ||
6485 | Analyze_And_Resolve (N, Typ); | |
6486 | end Expand_N_Op_Not; | |
6487 | ||
6488 | -------------------- | |
6489 | -- Expand_N_Op_Or -- | |
6490 | -------------------- | |
6491 | ||
6492 | procedure Expand_N_Op_Or (N : Node_Id) is | |
6493 | Typ : constant Entity_Id := Etype (N); | |
6494 | ||
6495 | begin | |
6496 | Binary_Op_Validity_Checks (N); | |
6497 | ||
6498 | if Is_Array_Type (Etype (N)) then | |
6499 | Expand_Boolean_Operator (N); | |
6500 | ||
6501 | elsif Is_Boolean_Type (Etype (N)) then | |
6502 | Adjust_Condition (Left_Opnd (N)); | |
6503 | Adjust_Condition (Right_Opnd (N)); | |
6504 | Set_Etype (N, Standard_Boolean); | |
6505 | Adjust_Result_Type (N, Typ); | |
6506 | end if; | |
6507 | end Expand_N_Op_Or; | |
6508 | ||
6509 | ---------------------- | |
6510 | -- Expand_N_Op_Plus -- | |
6511 | ---------------------- | |
6512 | ||
6513 | procedure Expand_N_Op_Plus (N : Node_Id) is | |
6514 | begin | |
6515 | Unary_Op_Validity_Checks (N); | |
6516 | end Expand_N_Op_Plus; | |
6517 | ||
6518 | --------------------- | |
6519 | -- Expand_N_Op_Rem -- | |
6520 | --------------------- | |
6521 | ||
6522 | procedure Expand_N_Op_Rem (N : Node_Id) is | |
6523 | Loc : constant Source_Ptr := Sloc (N); | |
fbf5a39b | 6524 | Typ : constant Entity_Id := Etype (N); |
70482933 RK |
6525 | |
6526 | Left : constant Node_Id := Left_Opnd (N); | |
6527 | Right : constant Node_Id := Right_Opnd (N); | |
6528 | ||
6529 | LLB : Uint; | |
6530 | Llo : Uint; | |
6531 | Lhi : Uint; | |
6532 | LOK : Boolean; | |
6533 | Rlo : Uint; | |
6534 | Rhi : Uint; | |
6535 | ROK : Boolean; | |
70482933 | 6536 | |
1033834f RD |
6537 | pragma Warnings (Off, Lhi); |
6538 | ||
70482933 RK |
6539 | begin |
6540 | Binary_Op_Validity_Checks (N); | |
6541 | ||
6542 | if Is_Integer_Type (Etype (N)) then | |
6543 | Apply_Divide_Check (N); | |
6544 | end if; | |
6545 | ||
685094bf RD |
6546 | -- Apply optimization x rem 1 = 0. We don't really need that with gcc, |
6547 | -- but it is useful with other back ends (e.g. AAMP), and is certainly | |
6548 | -- harmless. | |
fbf5a39b AC |
6549 | |
6550 | if Is_Integer_Type (Etype (N)) | |
6551 | and then Compile_Time_Known_Value (Right) | |
6552 | and then Expr_Value (Right) = Uint_1 | |
6553 | then | |
abcbd24c ST |
6554 | -- Call Remove_Side_Effects to ensure that any side effects in the |
6555 | -- ignored left operand (in particular function calls to user defined | |
6556 | -- functions) are properly executed. | |
6557 | ||
6558 | Remove_Side_Effects (Left); | |
6559 | ||
fbf5a39b AC |
6560 | Rewrite (N, Make_Integer_Literal (Loc, 0)); |
6561 | Analyze_And_Resolve (N, Typ); | |
6562 | return; | |
6563 | end if; | |
6564 | ||
685094bf RD |
6565 | -- Deal with annoying case of largest negative number remainder minus |
6566 | -- one. Gigi does not handle this case correctly, because it generates | |
6567 | -- a divide instruction which may trap in this case. | |
70482933 | 6568 | |
685094bf RD |
6569 | -- In fact the check is quite easy, if the right operand is -1, then |
6570 | -- the remainder is always 0, and we can just ignore the left operand | |
6571 | -- completely in this case. | |
70482933 RK |
6572 | |
6573 | Determine_Range (Right, ROK, Rlo, Rhi); | |
6574 | Determine_Range (Left, LOK, Llo, Lhi); | |
fbf5a39b | 6575 | |
16b05213 | 6576 | -- The operand type may be private (e.g. in the expansion of an |
685094bf RD |
6577 | -- intrinsic operation) so we must use the underlying type to get the |
6578 | -- bounds, and convert the literals explicitly. | |
fbf5a39b AC |
6579 | |
6580 | LLB := | |
6581 | Expr_Value | |
6582 | (Type_Low_Bound (Base_Type (Underlying_Type (Etype (Left))))); | |
6583 | ||
6584 | -- Now perform the test, generating code only if needed | |
70482933 RK |
6585 | |
6586 | if ((not ROK) or else (Rlo <= (-1) and then (-1) <= Rhi)) | |
6587 | and then | |
6588 | ((not LOK) or else (Llo = LLB)) | |
6589 | then | |
6590 | Rewrite (N, | |
6591 | Make_Conditional_Expression (Loc, | |
6592 | Expressions => New_List ( | |
6593 | Make_Op_Eq (Loc, | |
6594 | Left_Opnd => Duplicate_Subexpr (Right), | |
6595 | Right_Opnd => | |
fbf5a39b AC |
6596 | Unchecked_Convert_To (Typ, |
6597 | Make_Integer_Literal (Loc, -1))), | |
70482933 | 6598 | |
fbf5a39b AC |
6599 | Unchecked_Convert_To (Typ, |
6600 | Make_Integer_Literal (Loc, Uint_0)), | |
70482933 RK |
6601 | |
6602 | Relocate_Node (N)))); | |
6603 | ||
6604 | Set_Analyzed (Next (Next (First (Expressions (N))))); | |
6605 | Analyze_And_Resolve (N, Typ); | |
6606 | end if; | |
6607 | end Expand_N_Op_Rem; | |
6608 | ||
6609 | ----------------------------- | |
6610 | -- Expand_N_Op_Rotate_Left -- | |
6611 | ----------------------------- | |
6612 | ||
6613 | procedure Expand_N_Op_Rotate_Left (N : Node_Id) is | |
6614 | begin | |
6615 | Binary_Op_Validity_Checks (N); | |
6616 | end Expand_N_Op_Rotate_Left; | |
6617 | ||
6618 | ------------------------------ | |
6619 | -- Expand_N_Op_Rotate_Right -- | |
6620 | ------------------------------ | |
6621 | ||
6622 | procedure Expand_N_Op_Rotate_Right (N : Node_Id) is | |
6623 | begin | |
6624 | Binary_Op_Validity_Checks (N); | |
6625 | end Expand_N_Op_Rotate_Right; | |
6626 | ||
6627 | ---------------------------- | |
6628 | -- Expand_N_Op_Shift_Left -- | |
6629 | ---------------------------- | |
6630 | ||
6631 | procedure Expand_N_Op_Shift_Left (N : Node_Id) is | |
6632 | begin | |
6633 | Binary_Op_Validity_Checks (N); | |
6634 | end Expand_N_Op_Shift_Left; | |
6635 | ||
6636 | ----------------------------- | |
6637 | -- Expand_N_Op_Shift_Right -- | |
6638 | ----------------------------- | |
6639 | ||
6640 | procedure Expand_N_Op_Shift_Right (N : Node_Id) is | |
6641 | begin | |
6642 | Binary_Op_Validity_Checks (N); | |
6643 | end Expand_N_Op_Shift_Right; | |
6644 | ||
6645 | ---------------------------------------- | |
6646 | -- Expand_N_Op_Shift_Right_Arithmetic -- | |
6647 | ---------------------------------------- | |
6648 | ||
6649 | procedure Expand_N_Op_Shift_Right_Arithmetic (N : Node_Id) is | |
6650 | begin | |
6651 | Binary_Op_Validity_Checks (N); | |
6652 | end Expand_N_Op_Shift_Right_Arithmetic; | |
6653 | ||
6654 | -------------------------- | |
6655 | -- Expand_N_Op_Subtract -- | |
6656 | -------------------------- | |
6657 | ||
6658 | procedure Expand_N_Op_Subtract (N : Node_Id) is | |
6659 | Typ : constant Entity_Id := Etype (N); | |
6660 | ||
6661 | begin | |
6662 | Binary_Op_Validity_Checks (N); | |
6663 | ||
6664 | -- N - 0 = N for integer types | |
6665 | ||
6666 | if Is_Integer_Type (Typ) | |
6667 | and then Compile_Time_Known_Value (Right_Opnd (N)) | |
6668 | and then Expr_Value (Right_Opnd (N)) = 0 | |
6669 | then | |
6670 | Rewrite (N, Left_Opnd (N)); | |
6671 | return; | |
6672 | end if; | |
6673 | ||
8fc789c8 | 6674 | -- Arithmetic overflow checks for signed integer/fixed point types |
70482933 RK |
6675 | |
6676 | if Is_Signed_Integer_Type (Typ) | |
6677 | or else Is_Fixed_Point_Type (Typ) | |
6678 | then | |
6679 | Apply_Arithmetic_Overflow_Check (N); | |
6680 | ||
6681 | -- Vax floating-point types case | |
6682 | ||
6683 | elsif Vax_Float (Typ) then | |
6684 | Expand_Vax_Arith (N); | |
6685 | end if; | |
6686 | end Expand_N_Op_Subtract; | |
6687 | ||
6688 | --------------------- | |
6689 | -- Expand_N_Op_Xor -- | |
6690 | --------------------- | |
6691 | ||
6692 | procedure Expand_N_Op_Xor (N : Node_Id) is | |
6693 | Typ : constant Entity_Id := Etype (N); | |
6694 | ||
6695 | begin | |
6696 | Binary_Op_Validity_Checks (N); | |
6697 | ||
6698 | if Is_Array_Type (Etype (N)) then | |
6699 | Expand_Boolean_Operator (N); | |
6700 | ||
6701 | elsif Is_Boolean_Type (Etype (N)) then | |
6702 | Adjust_Condition (Left_Opnd (N)); | |
6703 | Adjust_Condition (Right_Opnd (N)); | |
6704 | Set_Etype (N, Standard_Boolean); | |
6705 | Adjust_Result_Type (N, Typ); | |
6706 | end if; | |
6707 | end Expand_N_Op_Xor; | |
6708 | ||
6709 | ---------------------- | |
6710 | -- Expand_N_Or_Else -- | |
6711 | ---------------------- | |
6712 | ||
6713 | -- Expand into conditional expression if Actions present, and also | |
6714 | -- deal with optimizing case of arguments being True or False. | |
6715 | ||
6716 | procedure Expand_N_Or_Else (N : Node_Id) is | |
6717 | Loc : constant Source_Ptr := Sloc (N); | |
6718 | Typ : constant Entity_Id := Etype (N); | |
6719 | Left : constant Node_Id := Left_Opnd (N); | |
6720 | Right : constant Node_Id := Right_Opnd (N); | |
6721 | Actlist : List_Id; | |
6722 | ||
6723 | begin | |
6724 | -- Deal with non-standard booleans | |
6725 | ||
6726 | if Is_Boolean_Type (Typ) then | |
6727 | Adjust_Condition (Left); | |
6728 | Adjust_Condition (Right); | |
6729 | Set_Etype (N, Standard_Boolean); | |
fbf5a39b | 6730 | end if; |
70482933 | 6731 | |
deff3e5e | 6732 | -- Check for cases where left argument is known to be True or False |
70482933 | 6733 | |
deff3e5e | 6734 | if Compile_Time_Known_Value (Left) then |
70482933 RK |
6735 | |
6736 | -- If left argument is False, change (False or else Right) to Right. | |
6737 | -- Any actions associated with Right will be executed unconditionally | |
6738 | -- and can thus be inserted into the tree unconditionally. | |
6739 | ||
deff3e5e | 6740 | if Expr_Value_E (Left) = Standard_False then |
70482933 RK |
6741 | if Present (Actions (N)) then |
6742 | Insert_Actions (N, Actions (N)); | |
6743 | end if; | |
6744 | ||
6745 | Rewrite (N, Right); | |
70482933 | 6746 | |
685094bf RD |
6747 | -- If left argument is True, change (True and then Right) to True. In |
6748 | -- this case we can forget the actions associated with Right, since | |
6749 | -- they will never be executed. | |
70482933 | 6750 | |
deff3e5e | 6751 | else pragma Assert (Expr_Value_E (Left) = Standard_True); |
70482933 RK |
6752 | Kill_Dead_Code (Right); |
6753 | Kill_Dead_Code (Actions (N)); | |
6754 | Rewrite (N, New_Occurrence_Of (Standard_True, Loc)); | |
70482933 | 6755 | end if; |
deff3e5e BD |
6756 | |
6757 | Adjust_Result_Type (N, Typ); | |
6758 | return; | |
70482933 RK |
6759 | end if; |
6760 | ||
6761 | -- If Actions are present, we expand | |
6762 | ||
6763 | -- left or else right | |
6764 | ||
6765 | -- into | |
6766 | ||
6767 | -- if left then True else right end | |
6768 | ||
6769 | -- with the actions becoming the Else_Actions of the conditional | |
6770 | -- expression. This conditional expression is then further expanded | |
6771 | -- (and will eventually disappear) | |
6772 | ||
6773 | if Present (Actions (N)) then | |
6774 | Actlist := Actions (N); | |
6775 | Rewrite (N, | |
6776 | Make_Conditional_Expression (Loc, | |
6777 | Expressions => New_List ( | |
6778 | Left, | |
6779 | New_Occurrence_Of (Standard_True, Loc), | |
6780 | Right))); | |
6781 | ||
6782 | Set_Else_Actions (N, Actlist); | |
6783 | Analyze_And_Resolve (N, Standard_Boolean); | |
6784 | Adjust_Result_Type (N, Typ); | |
6785 | return; | |
6786 | end if; | |
6787 | ||
6788 | -- No actions present, check for cases of right argument True/False | |
6789 | ||
deff3e5e | 6790 | if Compile_Time_Known_Value (Right) then |
70482933 | 6791 | |
685094bf RD |
6792 | -- Change (Left or else False) to Left. Note that we know there are |
6793 | -- no actions associated with the True operand, since we just checked | |
6794 | -- for this case above. | |
70482933 | 6795 | |
deff3e5e | 6796 | if Expr_Value_E (Right) = Standard_False then |
70482933 RK |
6797 | Rewrite (N, Left); |
6798 | ||
685094bf RD |
6799 | -- Change (Left or else True) to True, making sure to preserve any |
6800 | -- side effects associated with the Left operand. | |
70482933 | 6801 | |
deff3e5e | 6802 | else pragma Assert (Expr_Value_E (Right) = Standard_True); |
70482933 RK |
6803 | Remove_Side_Effects (Left); |
6804 | Rewrite | |
6805 | (N, New_Occurrence_Of (Standard_True, Loc)); | |
6806 | end if; | |
6807 | end if; | |
6808 | ||
6809 | Adjust_Result_Type (N, Typ); | |
6810 | end Expand_N_Or_Else; | |
6811 | ||
6812 | ----------------------------------- | |
6813 | -- Expand_N_Qualified_Expression -- | |
6814 | ----------------------------------- | |
6815 | ||
6816 | procedure Expand_N_Qualified_Expression (N : Node_Id) is | |
6817 | Operand : constant Node_Id := Expression (N); | |
6818 | Target_Type : constant Entity_Id := Entity (Subtype_Mark (N)); | |
6819 | ||
6820 | begin | |
f82944b7 JM |
6821 | -- Do validity check if validity checking operands |
6822 | ||
6823 | if Validity_Checks_On | |
6824 | and then Validity_Check_Operands | |
6825 | then | |
6826 | Ensure_Valid (Operand); | |
6827 | end if; | |
6828 | ||
6829 | -- Apply possible constraint check | |
6830 | ||
70482933 RK |
6831 | Apply_Constraint_Check (Operand, Target_Type, No_Sliding => True); |
6832 | end Expand_N_Qualified_Expression; | |
6833 | ||
6834 | --------------------------------- | |
6835 | -- Expand_N_Selected_Component -- | |
6836 | --------------------------------- | |
6837 | ||
6838 | -- If the selector is a discriminant of a concurrent object, rewrite the | |
6839 | -- prefix to denote the corresponding record type. | |
6840 | ||
6841 | procedure Expand_N_Selected_Component (N : Node_Id) is | |
6842 | Loc : constant Source_Ptr := Sloc (N); | |
6843 | Par : constant Node_Id := Parent (N); | |
6844 | P : constant Node_Id := Prefix (N); | |
fbf5a39b | 6845 | Ptyp : Entity_Id := Underlying_Type (Etype (P)); |
70482933 | 6846 | Disc : Entity_Id; |
70482933 | 6847 | New_N : Node_Id; |
fbf5a39b | 6848 | Dcon : Elmt_Id; |
70482933 RK |
6849 | |
6850 | function In_Left_Hand_Side (Comp : Node_Id) return Boolean; | |
6851 | -- Gigi needs a temporary for prefixes that depend on a discriminant, | |
6852 | -- unless the context of an assignment can provide size information. | |
fbf5a39b AC |
6853 | -- Don't we have a general routine that does this??? |
6854 | ||
6855 | ----------------------- | |
6856 | -- In_Left_Hand_Side -- | |
6857 | ----------------------- | |
70482933 RK |
6858 | |
6859 | function In_Left_Hand_Side (Comp : Node_Id) return Boolean is | |
6860 | begin | |
fbf5a39b AC |
6861 | return (Nkind (Parent (Comp)) = N_Assignment_Statement |
6862 | and then Comp = Name (Parent (Comp))) | |
6863 | or else (Present (Parent (Comp)) | |
6864 | and then Nkind (Parent (Comp)) in N_Subexpr | |
6865 | and then In_Left_Hand_Side (Parent (Comp))); | |
70482933 RK |
6866 | end In_Left_Hand_Side; |
6867 | ||
fbf5a39b AC |
6868 | -- Start of processing for Expand_N_Selected_Component |
6869 | ||
70482933 | 6870 | begin |
fbf5a39b AC |
6871 | -- Insert explicit dereference if required |
6872 | ||
6873 | if Is_Access_Type (Ptyp) then | |
6874 | Insert_Explicit_Dereference (P); | |
e6f69614 | 6875 | Analyze_And_Resolve (P, Designated_Type (Ptyp)); |
fbf5a39b AC |
6876 | |
6877 | if Ekind (Etype (P)) = E_Private_Subtype | |
6878 | and then Is_For_Access_Subtype (Etype (P)) | |
6879 | then | |
6880 | Set_Etype (P, Base_Type (Etype (P))); | |
6881 | end if; | |
6882 | ||
6883 | Ptyp := Etype (P); | |
6884 | end if; | |
6885 | ||
6886 | -- Deal with discriminant check required | |
6887 | ||
70482933 RK |
6888 | if Do_Discriminant_Check (N) then |
6889 | ||
685094bf RD |
6890 | -- Present the discriminant checking function to the backend, so that |
6891 | -- it can inline the call to the function. | |
70482933 RK |
6892 | |
6893 | Add_Inlined_Body | |
6894 | (Discriminant_Checking_Func | |
6895 | (Original_Record_Component (Entity (Selector_Name (N))))); | |
70482933 | 6896 | |
fbf5a39b | 6897 | -- Now reset the flag and generate the call |
70482933 | 6898 | |
fbf5a39b AC |
6899 | Set_Do_Discriminant_Check (N, False); |
6900 | Generate_Discriminant_Check (N); | |
70482933 RK |
6901 | end if; |
6902 | ||
b4592168 GD |
6903 | -- Ada 2005 (AI-318-02): If the prefix is a call to a build-in-place |
6904 | -- function, then additional actuals must be passed. | |
6905 | ||
6906 | if Ada_Version >= Ada_05 | |
6907 | and then Is_Build_In_Place_Function_Call (P) | |
6908 | then | |
6909 | Make_Build_In_Place_Call_In_Anonymous_Context (P); | |
6910 | end if; | |
6911 | ||
fbf5a39b AC |
6912 | -- Gigi cannot handle unchecked conversions that are the prefix of a |
6913 | -- selected component with discriminants. This must be checked during | |
6914 | -- expansion, because during analysis the type of the selector is not | |
6915 | -- known at the point the prefix is analyzed. If the conversion is the | |
6916 | -- target of an assignment, then we cannot force the evaluation. | |
70482933 RK |
6917 | |
6918 | if Nkind (Prefix (N)) = N_Unchecked_Type_Conversion | |
6919 | and then Has_Discriminants (Etype (N)) | |
6920 | and then not In_Left_Hand_Side (N) | |
6921 | then | |
6922 | Force_Evaluation (Prefix (N)); | |
6923 | end if; | |
6924 | ||
6925 | -- Remaining processing applies only if selector is a discriminant | |
6926 | ||
6927 | if Ekind (Entity (Selector_Name (N))) = E_Discriminant then | |
6928 | ||
6929 | -- If the selector is a discriminant of a constrained record type, | |
fbf5a39b AC |
6930 | -- we may be able to rewrite the expression with the actual value |
6931 | -- of the discriminant, a useful optimization in some cases. | |
70482933 RK |
6932 | |
6933 | if Is_Record_Type (Ptyp) | |
6934 | and then Has_Discriminants (Ptyp) | |
6935 | and then Is_Constrained (Ptyp) | |
70482933 | 6936 | then |
fbf5a39b AC |
6937 | -- Do this optimization for discrete types only, and not for |
6938 | -- access types (access discriminants get us into trouble!) | |
70482933 | 6939 | |
fbf5a39b AC |
6940 | if not Is_Discrete_Type (Etype (N)) then |
6941 | null; | |
6942 | ||
6943 | -- Don't do this on the left hand of an assignment statement. | |
6944 | -- Normally one would think that references like this would | |
6945 | -- not occur, but they do in generated code, and mean that | |
6946 | -- we really do want to assign the discriminant! | |
6947 | ||
6948 | elsif Nkind (Par) = N_Assignment_Statement | |
6949 | and then Name (Par) = N | |
6950 | then | |
6951 | null; | |
6952 | ||
685094bf RD |
6953 | -- Don't do this optimization for the prefix of an attribute or |
6954 | -- the operand of an object renaming declaration since these are | |
6955 | -- contexts where we do not want the value anyway. | |
fbf5a39b AC |
6956 | |
6957 | elsif (Nkind (Par) = N_Attribute_Reference | |
6958 | and then Prefix (Par) = N) | |
6959 | or else Is_Renamed_Object (N) | |
6960 | then | |
6961 | null; | |
6962 | ||
6963 | -- Don't do this optimization if we are within the code for a | |
6964 | -- discriminant check, since the whole point of such a check may | |
6965 | -- be to verify the condition on which the code below depends! | |
6966 | ||
6967 | elsif Is_In_Discriminant_Check (N) then | |
6968 | null; | |
6969 | ||
6970 | -- Green light to see if we can do the optimization. There is | |
685094bf RD |
6971 | -- still one condition that inhibits the optimization below but |
6972 | -- now is the time to check the particular discriminant. | |
fbf5a39b AC |
6973 | |
6974 | else | |
685094bf RD |
6975 | -- Loop through discriminants to find the matching discriminant |
6976 | -- constraint to see if we can copy it. | |
fbf5a39b AC |
6977 | |
6978 | Disc := First_Discriminant (Ptyp); | |
6979 | Dcon := First_Elmt (Discriminant_Constraint (Ptyp)); | |
6980 | Discr_Loop : while Present (Dcon) loop | |
6981 | ||
6982 | -- Check if this is the matching discriminant | |
6983 | ||
6984 | if Disc = Entity (Selector_Name (N)) then | |
70482933 | 6985 | |
fbf5a39b AC |
6986 | -- Here we have the matching discriminant. Check for |
6987 | -- the case of a discriminant of a component that is | |
6988 | -- constrained by an outer discriminant, which cannot | |
6989 | -- be optimized away. | |
6990 | ||
6991 | if | |
6992 | Denotes_Discriminant | |
20b5d666 | 6993 | (Node (Dcon), Check_Concurrent => True) |
fbf5a39b AC |
6994 | then |
6995 | exit Discr_Loop; | |
70482933 | 6996 | |
685094bf RD |
6997 | -- In the context of a case statement, the expression may |
6998 | -- have the base type of the discriminant, and we need to | |
6999 | -- preserve the constraint to avoid spurious errors on | |
7000 | -- missing cases. | |
70482933 | 7001 | |
fbf5a39b AC |
7002 | elsif Nkind (Parent (N)) = N_Case_Statement |
7003 | and then Etype (Node (Dcon)) /= Etype (Disc) | |
70482933 RK |
7004 | then |
7005 | Rewrite (N, | |
7006 | Make_Qualified_Expression (Loc, | |
fbf5a39b AC |
7007 | Subtype_Mark => |
7008 | New_Occurrence_Of (Etype (Disc), Loc), | |
7009 | Expression => | |
ffe9aba8 AC |
7010 | New_Copy_Tree (Node (Dcon)))); |
7011 | Analyze_And_Resolve (N, Etype (Disc)); | |
fbf5a39b AC |
7012 | |
7013 | -- In case that comes out as a static expression, | |
7014 | -- reset it (a selected component is never static). | |
7015 | ||
7016 | Set_Is_Static_Expression (N, False); | |
7017 | return; | |
7018 | ||
7019 | -- Otherwise we can just copy the constraint, but the | |
ffe9aba8 AC |
7020 | -- result is certainly not static! In some cases the |
7021 | -- discriminant constraint has been analyzed in the | |
7022 | -- context of the original subtype indication, but for | |
7023 | -- itypes the constraint might not have been analyzed | |
7024 | -- yet, and this must be done now. | |
fbf5a39b | 7025 | |
70482933 | 7026 | else |
ffe9aba8 AC |
7027 | Rewrite (N, New_Copy_Tree (Node (Dcon))); |
7028 | Analyze_And_Resolve (N); | |
fbf5a39b AC |
7029 | Set_Is_Static_Expression (N, False); |
7030 | return; | |
70482933 | 7031 | end if; |
70482933 RK |
7032 | end if; |
7033 | ||
fbf5a39b AC |
7034 | Next_Elmt (Dcon); |
7035 | Next_Discriminant (Disc); | |
7036 | end loop Discr_Loop; | |
70482933 | 7037 | |
fbf5a39b AC |
7038 | -- Note: the above loop should always find a matching |
7039 | -- discriminant, but if it does not, we just missed an | |
685094bf RD |
7040 | -- optimization due to some glitch (perhaps a previous error), |
7041 | -- so ignore. | |
fbf5a39b AC |
7042 | |
7043 | end if; | |
70482933 RK |
7044 | end if; |
7045 | ||
7046 | -- The only remaining processing is in the case of a discriminant of | |
7047 | -- a concurrent object, where we rewrite the prefix to denote the | |
7048 | -- corresponding record type. If the type is derived and has renamed | |
7049 | -- discriminants, use corresponding discriminant, which is the one | |
7050 | -- that appears in the corresponding record. | |
7051 | ||
7052 | if not Is_Concurrent_Type (Ptyp) then | |
7053 | return; | |
7054 | end if; | |
7055 | ||
7056 | Disc := Entity (Selector_Name (N)); | |
7057 | ||
7058 | if Is_Derived_Type (Ptyp) | |
7059 | and then Present (Corresponding_Discriminant (Disc)) | |
7060 | then | |
7061 | Disc := Corresponding_Discriminant (Disc); | |
7062 | end if; | |
7063 | ||
7064 | New_N := | |
7065 | Make_Selected_Component (Loc, | |
7066 | Prefix => | |
7067 | Unchecked_Convert_To (Corresponding_Record_Type (Ptyp), | |
7068 | New_Copy_Tree (P)), | |
7069 | Selector_Name => Make_Identifier (Loc, Chars (Disc))); | |
7070 | ||
7071 | Rewrite (N, New_N); | |
7072 | Analyze (N); | |
7073 | end if; | |
70482933 RK |
7074 | end Expand_N_Selected_Component; |
7075 | ||
7076 | -------------------- | |
7077 | -- Expand_N_Slice -- | |
7078 | -------------------- | |
7079 | ||
7080 | procedure Expand_N_Slice (N : Node_Id) is | |
7081 | Loc : constant Source_Ptr := Sloc (N); | |
7082 | Typ : constant Entity_Id := Etype (N); | |
7083 | Pfx : constant Node_Id := Prefix (N); | |
7084 | Ptp : Entity_Id := Etype (Pfx); | |
fbf5a39b | 7085 | |
81a5b587 | 7086 | function Is_Procedure_Actual (N : Node_Id) return Boolean; |
685094bf RD |
7087 | -- Check whether the argument is an actual for a procedure call, in |
7088 | -- which case the expansion of a bit-packed slice is deferred until the | |
7089 | -- call itself is expanded. The reason this is required is that we might | |
7090 | -- have an IN OUT or OUT parameter, and the copy out is essential, and | |
7091 | -- that copy out would be missed if we created a temporary here in | |
7092 | -- Expand_N_Slice. Note that we don't bother to test specifically for an | |
7093 | -- IN OUT or OUT mode parameter, since it is a bit tricky to do, and it | |
7094 | -- is harmless to defer expansion in the IN case, since the call | |
7095 | -- processing will still generate the appropriate copy in operation, | |
7096 | -- which will take care of the slice. | |
81a5b587 | 7097 | |
fbf5a39b | 7098 | procedure Make_Temporary; |
685094bf RD |
7099 | -- Create a named variable for the value of the slice, in cases where |
7100 | -- the back-end cannot handle it properly, e.g. when packed types or | |
7101 | -- unaligned slices are involved. | |
fbf5a39b | 7102 | |
81a5b587 AC |
7103 | ------------------------- |
7104 | -- Is_Procedure_Actual -- | |
7105 | ------------------------- | |
7106 | ||
7107 | function Is_Procedure_Actual (N : Node_Id) return Boolean is | |
7108 | Par : Node_Id := Parent (N); | |
08aa9a4a | 7109 | |
81a5b587 | 7110 | begin |
81a5b587 | 7111 | loop |
c6a60aa1 RD |
7112 | -- If our parent is a procedure call we can return |
7113 | ||
81a5b587 AC |
7114 | if Nkind (Par) = N_Procedure_Call_Statement then |
7115 | return True; | |
6b6fcd3e | 7116 | |
685094bf RD |
7117 | -- If our parent is a type conversion, keep climbing the tree, |
7118 | -- since a type conversion can be a procedure actual. Also keep | |
7119 | -- climbing if parameter association or a qualified expression, | |
7120 | -- since these are additional cases that do can appear on | |
7121 | -- procedure actuals. | |
6b6fcd3e | 7122 | |
303b4d58 AC |
7123 | elsif Nkind_In (Par, N_Type_Conversion, |
7124 | N_Parameter_Association, | |
7125 | N_Qualified_Expression) | |
c6a60aa1 | 7126 | then |
81a5b587 | 7127 | Par := Parent (Par); |
c6a60aa1 RD |
7128 | |
7129 | -- Any other case is not what we are looking for | |
7130 | ||
7131 | else | |
7132 | return False; | |
81a5b587 AC |
7133 | end if; |
7134 | end loop; | |
81a5b587 AC |
7135 | end Is_Procedure_Actual; |
7136 | ||
fbf5a39b AC |
7137 | -------------------- |
7138 | -- Make_Temporary -- | |
7139 | -------------------- | |
7140 | ||
7141 | procedure Make_Temporary is | |
7142 | Decl : Node_Id; | |
7143 | Ent : constant Entity_Id := | |
7144 | Make_Defining_Identifier (Loc, New_Internal_Name ('T')); | |
7145 | begin | |
7146 | Decl := | |
7147 | Make_Object_Declaration (Loc, | |
7148 | Defining_Identifier => Ent, | |
7149 | Object_Definition => New_Occurrence_Of (Typ, Loc)); | |
7150 | ||
7151 | Set_No_Initialization (Decl); | |
7152 | ||
7153 | Insert_Actions (N, New_List ( | |
7154 | Decl, | |
7155 | Make_Assignment_Statement (Loc, | |
7156 | Name => New_Occurrence_Of (Ent, Loc), | |
7157 | Expression => Relocate_Node (N)))); | |
7158 | ||
7159 | Rewrite (N, New_Occurrence_Of (Ent, Loc)); | |
7160 | Analyze_And_Resolve (N, Typ); | |
7161 | end Make_Temporary; | |
7162 | ||
7163 | -- Start of processing for Expand_N_Slice | |
70482933 RK |
7164 | |
7165 | begin | |
7166 | -- Special handling for access types | |
7167 | ||
7168 | if Is_Access_Type (Ptp) then | |
7169 | ||
70482933 RK |
7170 | Ptp := Designated_Type (Ptp); |
7171 | ||
e6f69614 AC |
7172 | Rewrite (Pfx, |
7173 | Make_Explicit_Dereference (Sloc (N), | |
7174 | Prefix => Relocate_Node (Pfx))); | |
70482933 | 7175 | |
e6f69614 | 7176 | Analyze_And_Resolve (Pfx, Ptp); |
70482933 RK |
7177 | end if; |
7178 | ||
b4592168 GD |
7179 | -- Ada 2005 (AI-318-02): If the prefix is a call to a build-in-place |
7180 | -- function, then additional actuals must be passed. | |
7181 | ||
7182 | if Ada_Version >= Ada_05 | |
7183 | and then Is_Build_In_Place_Function_Call (Pfx) | |
7184 | then | |
7185 | Make_Build_In_Place_Call_In_Anonymous_Context (Pfx); | |
7186 | end if; | |
7187 | ||
685094bf RD |
7188 | -- Range checks are potentially also needed for cases involving a slice |
7189 | -- indexed by a subtype indication, but Do_Range_Check can currently | |
7190 | -- only be set for expressions ??? | |
70482933 RK |
7191 | |
7192 | if not Index_Checks_Suppressed (Ptp) | |
7193 | and then (not Is_Entity_Name (Pfx) | |
7194 | or else not Index_Checks_Suppressed (Entity (Pfx))) | |
7195 | and then Nkind (Discrete_Range (N)) /= N_Subtype_Indication | |
0669bebe GB |
7196 | |
7197 | -- Do not enable range check to nodes associated with the frontend | |
7198 | -- expansion of the dispatch table. We first check if Ada.Tags is | |
7199 | -- already loaded to avoid the addition of an undesired dependence | |
7200 | -- on such run-time unit. | |
7201 | ||
26bff3d9 JM |
7202 | and then |
7203 | (VM_Target /= No_VM | |
7204 | or else not | |
7205 | (RTU_Loaded (Ada_Tags) | |
7206 | and then Nkind (Prefix (N)) = N_Selected_Component | |
7207 | and then Present (Entity (Selector_Name (Prefix (N)))) | |
7208 | and then Entity (Selector_Name (Prefix (N))) = | |
7209 | RTE_Record_Component (RE_Prims_Ptr))) | |
70482933 RK |
7210 | then |
7211 | Enable_Range_Check (Discrete_Range (N)); | |
7212 | end if; | |
7213 | ||
7214 | -- The remaining case to be handled is packed slices. We can leave | |
7215 | -- packed slices as they are in the following situations: | |
7216 | ||
7217 | -- 1. Right or left side of an assignment (we can handle this | |
7218 | -- situation correctly in the assignment statement expansion). | |
7219 | ||
685094bf RD |
7220 | -- 2. Prefix of indexed component (the slide is optimized away in this |
7221 | -- case, see the start of Expand_N_Slice.) | |
70482933 | 7222 | |
685094bf RD |
7223 | -- 3. Object renaming declaration, since we want the name of the |
7224 | -- slice, not the value. | |
70482933 | 7225 | |
685094bf RD |
7226 | -- 4. Argument to procedure call, since copy-in/copy-out handling may |
7227 | -- be required, and this is handled in the expansion of call | |
7228 | -- itself. | |
70482933 | 7229 | |
685094bf RD |
7230 | -- 5. Prefix of an address attribute (this is an error which is caught |
7231 | -- elsewhere, and the expansion would interfere with generating the | |
7232 | -- error message). | |
70482933 | 7233 | |
81a5b587 | 7234 | if not Is_Packed (Typ) then |
08aa9a4a | 7235 | |
685094bf RD |
7236 | -- Apply transformation for actuals of a function call, where |
7237 | -- Expand_Actuals is not used. | |
81a5b587 AC |
7238 | |
7239 | if Nkind (Parent (N)) = N_Function_Call | |
7240 | and then Is_Possibly_Unaligned_Slice (N) | |
7241 | then | |
7242 | Make_Temporary; | |
7243 | end if; | |
7244 | ||
7245 | elsif Nkind (Parent (N)) = N_Assignment_Statement | |
7246 | or else (Nkind (Parent (Parent (N))) = N_Assignment_Statement | |
7247 | and then Parent (N) = Name (Parent (Parent (N)))) | |
70482933 | 7248 | then |
81a5b587 | 7249 | return; |
70482933 | 7250 | |
81a5b587 AC |
7251 | elsif Nkind (Parent (N)) = N_Indexed_Component |
7252 | or else Is_Renamed_Object (N) | |
7253 | or else Is_Procedure_Actual (N) | |
7254 | then | |
7255 | return; | |
70482933 | 7256 | |
91b1417d AC |
7257 | elsif Nkind (Parent (N)) = N_Attribute_Reference |
7258 | and then Attribute_Name (Parent (N)) = Name_Address | |
fbf5a39b | 7259 | then |
81a5b587 AC |
7260 | return; |
7261 | ||
7262 | else | |
fbf5a39b | 7263 | Make_Temporary; |
70482933 RK |
7264 | end if; |
7265 | end Expand_N_Slice; | |
7266 | ||
7267 | ------------------------------ | |
7268 | -- Expand_N_Type_Conversion -- | |
7269 | ------------------------------ | |
7270 | ||
7271 | procedure Expand_N_Type_Conversion (N : Node_Id) is | |
7272 | Loc : constant Source_Ptr := Sloc (N); | |
7273 | Operand : constant Node_Id := Expression (N); | |
7274 | Target_Type : constant Entity_Id := Etype (N); | |
7275 | Operand_Type : Entity_Id := Etype (Operand); | |
7276 | ||
7277 | procedure Handle_Changed_Representation; | |
685094bf RD |
7278 | -- This is called in the case of record and array type conversions to |
7279 | -- see if there is a change of representation to be handled. Change of | |
7280 | -- representation is actually handled at the assignment statement level, | |
7281 | -- and what this procedure does is rewrite node N conversion as an | |
7282 | -- assignment to temporary. If there is no change of representation, | |
7283 | -- then the conversion node is unchanged. | |
70482933 RK |
7284 | |
7285 | procedure Real_Range_Check; | |
7286 | -- Handles generation of range check for real target value | |
7287 | ||
7288 | ----------------------------------- | |
7289 | -- Handle_Changed_Representation -- | |
7290 | ----------------------------------- | |
7291 | ||
7292 | procedure Handle_Changed_Representation is | |
7293 | Temp : Entity_Id; | |
7294 | Decl : Node_Id; | |
7295 | Odef : Node_Id; | |
7296 | Disc : Node_Id; | |
7297 | N_Ix : Node_Id; | |
7298 | Cons : List_Id; | |
7299 | ||
7300 | begin | |
f82944b7 | 7301 | -- Nothing else to do if no change of representation |
70482933 RK |
7302 | |
7303 | if Same_Representation (Operand_Type, Target_Type) then | |
7304 | return; | |
7305 | ||
7306 | -- The real change of representation work is done by the assignment | |
7307 | -- statement processing. So if this type conversion is appearing as | |
7308 | -- the expression of an assignment statement, nothing needs to be | |
7309 | -- done to the conversion. | |
7310 | ||
7311 | elsif Nkind (Parent (N)) = N_Assignment_Statement then | |
7312 | return; | |
7313 | ||
7314 | -- Otherwise we need to generate a temporary variable, and do the | |
7315 | -- change of representation assignment into that temporary variable. | |
7316 | -- The conversion is then replaced by a reference to this variable. | |
7317 | ||
7318 | else | |
7319 | Cons := No_List; | |
7320 | ||
685094bf RD |
7321 | -- If type is unconstrained we have to add a constraint, copied |
7322 | -- from the actual value of the left hand side. | |
70482933 RK |
7323 | |
7324 | if not Is_Constrained (Target_Type) then | |
7325 | if Has_Discriminants (Operand_Type) then | |
7326 | Disc := First_Discriminant (Operand_Type); | |
fbf5a39b AC |
7327 | |
7328 | if Disc /= First_Stored_Discriminant (Operand_Type) then | |
7329 | Disc := First_Stored_Discriminant (Operand_Type); | |
7330 | end if; | |
7331 | ||
70482933 RK |
7332 | Cons := New_List; |
7333 | while Present (Disc) loop | |
7334 | Append_To (Cons, | |
7335 | Make_Selected_Component (Loc, | |
fbf5a39b | 7336 | Prefix => Duplicate_Subexpr_Move_Checks (Operand), |
70482933 RK |
7337 | Selector_Name => |
7338 | Make_Identifier (Loc, Chars (Disc)))); | |
7339 | Next_Discriminant (Disc); | |
7340 | end loop; | |
7341 | ||
7342 | elsif Is_Array_Type (Operand_Type) then | |
7343 | N_Ix := First_Index (Target_Type); | |
7344 | Cons := New_List; | |
7345 | ||
7346 | for J in 1 .. Number_Dimensions (Operand_Type) loop | |
7347 | ||
7348 | -- We convert the bounds explicitly. We use an unchecked | |
7349 | -- conversion because bounds checks are done elsewhere. | |
7350 | ||
7351 | Append_To (Cons, | |
7352 | Make_Range (Loc, | |
7353 | Low_Bound => | |
7354 | Unchecked_Convert_To (Etype (N_Ix), | |
7355 | Make_Attribute_Reference (Loc, | |
7356 | Prefix => | |
fbf5a39b | 7357 | Duplicate_Subexpr_No_Checks |
70482933 RK |
7358 | (Operand, Name_Req => True), |
7359 | Attribute_Name => Name_First, | |
7360 | Expressions => New_List ( | |
7361 | Make_Integer_Literal (Loc, J)))), | |
7362 | ||
7363 | High_Bound => | |
7364 | Unchecked_Convert_To (Etype (N_Ix), | |
7365 | Make_Attribute_Reference (Loc, | |
7366 | Prefix => | |
fbf5a39b | 7367 | Duplicate_Subexpr_No_Checks |
70482933 RK |
7368 | (Operand, Name_Req => True), |
7369 | Attribute_Name => Name_Last, | |
7370 | Expressions => New_List ( | |
7371 | Make_Integer_Literal (Loc, J)))))); | |
7372 | ||
7373 | Next_Index (N_Ix); | |
7374 | end loop; | |
7375 | end if; | |
7376 | end if; | |
7377 | ||
7378 | Odef := New_Occurrence_Of (Target_Type, Loc); | |
7379 | ||
7380 | if Present (Cons) then | |
7381 | Odef := | |
7382 | Make_Subtype_Indication (Loc, | |
7383 | Subtype_Mark => Odef, | |
7384 | Constraint => | |
7385 | Make_Index_Or_Discriminant_Constraint (Loc, | |
7386 | Constraints => Cons)); | |
7387 | end if; | |
7388 | ||
7389 | Temp := Make_Defining_Identifier (Loc, New_Internal_Name ('C')); | |
7390 | Decl := | |
7391 | Make_Object_Declaration (Loc, | |
7392 | Defining_Identifier => Temp, | |
7393 | Object_Definition => Odef); | |
7394 | ||
7395 | Set_No_Initialization (Decl, True); | |
7396 | ||
7397 | -- Insert required actions. It is essential to suppress checks | |
7398 | -- since we have suppressed default initialization, which means | |
7399 | -- that the variable we create may have no discriminants. | |
7400 | ||
7401 | Insert_Actions (N, | |
7402 | New_List ( | |
7403 | Decl, | |
7404 | Make_Assignment_Statement (Loc, | |
7405 | Name => New_Occurrence_Of (Temp, Loc), | |
7406 | Expression => Relocate_Node (N))), | |
7407 | Suppress => All_Checks); | |
7408 | ||
7409 | Rewrite (N, New_Occurrence_Of (Temp, Loc)); | |
7410 | return; | |
7411 | end if; | |
7412 | end Handle_Changed_Representation; | |
7413 | ||
7414 | ---------------------- | |
7415 | -- Real_Range_Check -- | |
7416 | ---------------------- | |
7417 | ||
685094bf RD |
7418 | -- Case of conversions to floating-point or fixed-point. If range checks |
7419 | -- are enabled and the target type has a range constraint, we convert: | |
70482933 RK |
7420 | |
7421 | -- typ (x) | |
7422 | ||
7423 | -- to | |
7424 | ||
7425 | -- Tnn : typ'Base := typ'Base (x); | |
7426 | -- [constraint_error when Tnn < typ'First or else Tnn > typ'Last] | |
7427 | -- Tnn | |
7428 | ||
685094bf RD |
7429 | -- This is necessary when there is a conversion of integer to float or |
7430 | -- to fixed-point to ensure that the correct checks are made. It is not | |
7431 | -- necessary for float to float where it is enough to simply set the | |
7432 | -- Do_Range_Check flag. | |
fbf5a39b | 7433 | |
70482933 RK |
7434 | procedure Real_Range_Check is |
7435 | Btyp : constant Entity_Id := Base_Type (Target_Type); | |
7436 | Lo : constant Node_Id := Type_Low_Bound (Target_Type); | |
7437 | Hi : constant Node_Id := Type_High_Bound (Target_Type); | |
fbf5a39b | 7438 | Xtyp : constant Entity_Id := Etype (Operand); |
70482933 RK |
7439 | Conv : Node_Id; |
7440 | Tnn : Entity_Id; | |
7441 | ||
7442 | begin | |
7443 | -- Nothing to do if conversion was rewritten | |
7444 | ||
7445 | if Nkind (N) /= N_Type_Conversion then | |
7446 | return; | |
7447 | end if; | |
7448 | ||
685094bf RD |
7449 | -- Nothing to do if range checks suppressed, or target has the same |
7450 | -- range as the base type (or is the base type). | |
70482933 RK |
7451 | |
7452 | if Range_Checks_Suppressed (Target_Type) | |
7453 | or else (Lo = Type_Low_Bound (Btyp) | |
7454 | and then | |
7455 | Hi = Type_High_Bound (Btyp)) | |
7456 | then | |
7457 | return; | |
7458 | end if; | |
7459 | ||
685094bf RD |
7460 | -- Nothing to do if expression is an entity on which checks have been |
7461 | -- suppressed. | |
70482933 | 7462 | |
fbf5a39b AC |
7463 | if Is_Entity_Name (Operand) |
7464 | and then Range_Checks_Suppressed (Entity (Operand)) | |
7465 | then | |
7466 | return; | |
7467 | end if; | |
7468 | ||
685094bf RD |
7469 | -- Nothing to do if bounds are all static and we can tell that the |
7470 | -- expression is within the bounds of the target. Note that if the | |
7471 | -- operand is of an unconstrained floating-point type, then we do | |
7472 | -- not trust it to be in range (might be infinite) | |
fbf5a39b AC |
7473 | |
7474 | declare | |
f02b8bb8 RD |
7475 | S_Lo : constant Node_Id := Type_Low_Bound (Xtyp); |
7476 | S_Hi : constant Node_Id := Type_High_Bound (Xtyp); | |
fbf5a39b AC |
7477 | |
7478 | begin | |
7479 | if (not Is_Floating_Point_Type (Xtyp) | |
7480 | or else Is_Constrained (Xtyp)) | |
7481 | and then Compile_Time_Known_Value (S_Lo) | |
7482 | and then Compile_Time_Known_Value (S_Hi) | |
7483 | and then Compile_Time_Known_Value (Hi) | |
7484 | and then Compile_Time_Known_Value (Lo) | |
7485 | then | |
7486 | declare | |
7487 | D_Lov : constant Ureal := Expr_Value_R (Lo); | |
7488 | D_Hiv : constant Ureal := Expr_Value_R (Hi); | |
7489 | S_Lov : Ureal; | |
7490 | S_Hiv : Ureal; | |
7491 | ||
7492 | begin | |
7493 | if Is_Real_Type (Xtyp) then | |
7494 | S_Lov := Expr_Value_R (S_Lo); | |
7495 | S_Hiv := Expr_Value_R (S_Hi); | |
7496 | else | |
7497 | S_Lov := UR_From_Uint (Expr_Value (S_Lo)); | |
7498 | S_Hiv := UR_From_Uint (Expr_Value (S_Hi)); | |
7499 | end if; | |
7500 | ||
7501 | if D_Hiv > D_Lov | |
7502 | and then S_Lov >= D_Lov | |
7503 | and then S_Hiv <= D_Hiv | |
7504 | then | |
7505 | Set_Do_Range_Check (Operand, False); | |
7506 | return; | |
7507 | end if; | |
7508 | end; | |
7509 | end if; | |
7510 | end; | |
7511 | ||
7512 | -- For float to float conversions, we are done | |
7513 | ||
7514 | if Is_Floating_Point_Type (Xtyp) | |
7515 | and then | |
7516 | Is_Floating_Point_Type (Btyp) | |
70482933 RK |
7517 | then |
7518 | return; | |
7519 | end if; | |
7520 | ||
fbf5a39b | 7521 | -- Otherwise rewrite the conversion as described above |
70482933 RK |
7522 | |
7523 | Conv := Relocate_Node (N); | |
7524 | Rewrite | |
7525 | (Subtype_Mark (Conv), New_Occurrence_Of (Btyp, Loc)); | |
7526 | Set_Etype (Conv, Btyp); | |
7527 | ||
f02b8bb8 RD |
7528 | -- Enable overflow except for case of integer to float conversions, |
7529 | -- where it is never required, since we can never have overflow in | |
7530 | -- this case. | |
70482933 | 7531 | |
fbf5a39b AC |
7532 | if not Is_Integer_Type (Etype (Operand)) then |
7533 | Enable_Overflow_Check (Conv); | |
70482933 RK |
7534 | end if; |
7535 | ||
7536 | Tnn := | |
7537 | Make_Defining_Identifier (Loc, | |
7538 | Chars => New_Internal_Name ('T')); | |
7539 | ||
7540 | Insert_Actions (N, New_List ( | |
7541 | Make_Object_Declaration (Loc, | |
7542 | Defining_Identifier => Tnn, | |
7543 | Object_Definition => New_Occurrence_Of (Btyp, Loc), | |
7544 | Expression => Conv), | |
7545 | ||
7546 | Make_Raise_Constraint_Error (Loc, | |
07fc65c4 GB |
7547 | Condition => |
7548 | Make_Or_Else (Loc, | |
7549 | Left_Opnd => | |
7550 | Make_Op_Lt (Loc, | |
7551 | Left_Opnd => New_Occurrence_Of (Tnn, Loc), | |
7552 | Right_Opnd => | |
7553 | Make_Attribute_Reference (Loc, | |
7554 | Attribute_Name => Name_First, | |
7555 | Prefix => | |
7556 | New_Occurrence_Of (Target_Type, Loc))), | |
70482933 | 7557 | |
07fc65c4 GB |
7558 | Right_Opnd => |
7559 | Make_Op_Gt (Loc, | |
7560 | Left_Opnd => New_Occurrence_Of (Tnn, Loc), | |
7561 | Right_Opnd => | |
7562 | Make_Attribute_Reference (Loc, | |
7563 | Attribute_Name => Name_Last, | |
7564 | Prefix => | |
7565 | New_Occurrence_Of (Target_Type, Loc)))), | |
7566 | Reason => CE_Range_Check_Failed))); | |
70482933 RK |
7567 | |
7568 | Rewrite (N, New_Occurrence_Of (Tnn, Loc)); | |
7569 | Analyze_And_Resolve (N, Btyp); | |
7570 | end Real_Range_Check; | |
7571 | ||
7572 | -- Start of processing for Expand_N_Type_Conversion | |
7573 | ||
7574 | begin | |
685094bf RD |
7575 | -- Nothing at all to do if conversion is to the identical type so remove |
7576 | -- the conversion completely, it is useless. | |
70482933 RK |
7577 | |
7578 | if Operand_Type = Target_Type then | |
fbf5a39b | 7579 | Rewrite (N, Relocate_Node (Operand)); |
70482933 RK |
7580 | return; |
7581 | end if; | |
7582 | ||
685094bf RD |
7583 | -- Nothing to do if this is the second argument of read. This is a |
7584 | -- "backwards" conversion that will be handled by the specialized code | |
7585 | -- in attribute processing. | |
70482933 RK |
7586 | |
7587 | if Nkind (Parent (N)) = N_Attribute_Reference | |
7588 | and then Attribute_Name (Parent (N)) = Name_Read | |
7589 | and then Next (First (Expressions (Parent (N)))) = N | |
7590 | then | |
7591 | return; | |
7592 | end if; | |
7593 | ||
7594 | -- Here if we may need to expand conversion | |
7595 | ||
f82944b7 JM |
7596 | -- Do validity check if validity checking operands |
7597 | ||
7598 | if Validity_Checks_On | |
7599 | and then Validity_Check_Operands | |
7600 | then | |
7601 | Ensure_Valid (Operand); | |
7602 | end if; | |
7603 | ||
70482933 RK |
7604 | -- Special case of converting from non-standard boolean type |
7605 | ||
7606 | if Is_Boolean_Type (Operand_Type) | |
7607 | and then (Nonzero_Is_True (Operand_Type)) | |
7608 | then | |
7609 | Adjust_Condition (Operand); | |
7610 | Set_Etype (Operand, Standard_Boolean); | |
7611 | Operand_Type := Standard_Boolean; | |
7612 | end if; | |
7613 | ||
7614 | -- Case of converting to an access type | |
7615 | ||
7616 | if Is_Access_Type (Target_Type) then | |
7617 | ||
d766cee3 RD |
7618 | -- Apply an accessibility check when the conversion operand is an |
7619 | -- access parameter (or a renaming thereof), unless conversion was | |
e84e11ba GD |
7620 | -- expanded from an Unchecked_ or Unrestricted_Access attribute. |
7621 | -- Note that other checks may still need to be applied below (such | |
7622 | -- as tagged type checks). | |
70482933 RK |
7623 | |
7624 | if Is_Entity_Name (Operand) | |
d766cee3 RD |
7625 | and then |
7626 | (Is_Formal (Entity (Operand)) | |
7627 | or else | |
7628 | (Present (Renamed_Object (Entity (Operand))) | |
7629 | and then Is_Entity_Name (Renamed_Object (Entity (Operand))) | |
7630 | and then Is_Formal | |
7631 | (Entity (Renamed_Object (Entity (Operand)))))) | |
70482933 | 7632 | and then Ekind (Etype (Operand)) = E_Anonymous_Access_Type |
d766cee3 RD |
7633 | and then (Nkind (Original_Node (N)) /= N_Attribute_Reference |
7634 | or else Attribute_Name (Original_Node (N)) = Name_Access) | |
70482933 | 7635 | then |
e84e11ba GD |
7636 | Apply_Accessibility_Check |
7637 | (Operand, Target_Type, Insert_Node => Operand); | |
70482933 | 7638 | |
e84e11ba | 7639 | -- If the level of the operand type is statically deeper than the |
685094bf RD |
7640 | -- level of the target type, then force Program_Error. Note that this |
7641 | -- can only occur for cases where the attribute is within the body of | |
7642 | -- an instantiation (otherwise the conversion will already have been | |
7643 | -- rejected as illegal). Note: warnings are issued by the analyzer | |
7644 | -- for the instance cases. | |
70482933 RK |
7645 | |
7646 | elsif In_Instance_Body | |
07fc65c4 GB |
7647 | and then Type_Access_Level (Operand_Type) > |
7648 | Type_Access_Level (Target_Type) | |
70482933 | 7649 | then |
07fc65c4 GB |
7650 | Rewrite (N, |
7651 | Make_Raise_Program_Error (Sloc (N), | |
7652 | Reason => PE_Accessibility_Check_Failed)); | |
70482933 RK |
7653 | Set_Etype (N, Target_Type); |
7654 | ||
685094bf RD |
7655 | -- When the operand is a selected access discriminant the check needs |
7656 | -- to be made against the level of the object denoted by the prefix | |
7657 | -- of the selected name. Force Program_Error for this case as well | |
7658 | -- (this accessibility violation can only happen if within the body | |
7659 | -- of an instantiation). | |
70482933 RK |
7660 | |
7661 | elsif In_Instance_Body | |
7662 | and then Ekind (Operand_Type) = E_Anonymous_Access_Type | |
7663 | and then Nkind (Operand) = N_Selected_Component | |
7664 | and then Object_Access_Level (Operand) > | |
7665 | Type_Access_Level (Target_Type) | |
7666 | then | |
07fc65c4 GB |
7667 | Rewrite (N, |
7668 | Make_Raise_Program_Error (Sloc (N), | |
7669 | Reason => PE_Accessibility_Check_Failed)); | |
70482933 RK |
7670 | Set_Etype (N, Target_Type); |
7671 | end if; | |
7672 | end if; | |
7673 | ||
7674 | -- Case of conversions of tagged types and access to tagged types | |
7675 | ||
685094bf RD |
7676 | -- When needed, that is to say when the expression is class-wide, Add |
7677 | -- runtime a tag check for (strict) downward conversion by using the | |
7678 | -- membership test, generating: | |
70482933 RK |
7679 | |
7680 | -- [constraint_error when Operand not in Target_Type'Class] | |
7681 | ||
7682 | -- or in the access type case | |
7683 | ||
7684 | -- [constraint_error | |
7685 | -- when Operand /= null | |
7686 | -- and then Operand.all not in | |
7687 | -- Designated_Type (Target_Type)'Class] | |
7688 | ||
7689 | if (Is_Access_Type (Target_Type) | |
7690 | and then Is_Tagged_Type (Designated_Type (Target_Type))) | |
7691 | or else Is_Tagged_Type (Target_Type) | |
7692 | then | |
685094bf RD |
7693 | -- Do not do any expansion in the access type case if the parent is a |
7694 | -- renaming, since this is an error situation which will be caught by | |
7695 | -- Sem_Ch8, and the expansion can interfere with this error check. | |
70482933 RK |
7696 | |
7697 | if Is_Access_Type (Target_Type) | |
7698 | and then Is_Renamed_Object (N) | |
7699 | then | |
7700 | return; | |
7701 | end if; | |
7702 | ||
0669bebe | 7703 | -- Otherwise, proceed with processing tagged conversion |
70482933 RK |
7704 | |
7705 | declare | |
8cea7b64 HK |
7706 | Actual_Op_Typ : Entity_Id; |
7707 | Actual_Targ_Typ : Entity_Id; | |
7708 | Make_Conversion : Boolean := False; | |
7709 | Root_Op_Typ : Entity_Id; | |
70482933 | 7710 | |
8cea7b64 HK |
7711 | procedure Make_Tag_Check (Targ_Typ : Entity_Id); |
7712 | -- Create a membership check to test whether Operand is a member | |
7713 | -- of Targ_Typ. If the original Target_Type is an access, include | |
7714 | -- a test for null value. The check is inserted at N. | |
7715 | ||
7716 | -------------------- | |
7717 | -- Make_Tag_Check -- | |
7718 | -------------------- | |
7719 | ||
7720 | procedure Make_Tag_Check (Targ_Typ : Entity_Id) is | |
7721 | Cond : Node_Id; | |
7722 | ||
7723 | begin | |
7724 | -- Generate: | |
7725 | -- [Constraint_Error | |
7726 | -- when Operand /= null | |
7727 | -- and then Operand.all not in Targ_Typ] | |
7728 | ||
7729 | if Is_Access_Type (Target_Type) then | |
7730 | Cond := | |
7731 | Make_And_Then (Loc, | |
7732 | Left_Opnd => | |
7733 | Make_Op_Ne (Loc, | |
7734 | Left_Opnd => Duplicate_Subexpr_No_Checks (Operand), | |
7735 | Right_Opnd => Make_Null (Loc)), | |
7736 | ||
7737 | Right_Opnd => | |
7738 | Make_Not_In (Loc, | |
7739 | Left_Opnd => | |
7740 | Make_Explicit_Dereference (Loc, | |
7741 | Prefix => Duplicate_Subexpr_No_Checks (Operand)), | |
7742 | Right_Opnd => New_Reference_To (Targ_Typ, Loc))); | |
7743 | ||
7744 | -- Generate: | |
7745 | -- [Constraint_Error when Operand not in Targ_Typ] | |
7746 | ||
7747 | else | |
7748 | Cond := | |
7749 | Make_Not_In (Loc, | |
7750 | Left_Opnd => Duplicate_Subexpr_No_Checks (Operand), | |
7751 | Right_Opnd => New_Reference_To (Targ_Typ, Loc)); | |
7752 | end if; | |
7753 | ||
7754 | Insert_Action (N, | |
7755 | Make_Raise_Constraint_Error (Loc, | |
7756 | Condition => Cond, | |
7757 | Reason => CE_Tag_Check_Failed)); | |
7758 | end Make_Tag_Check; | |
7759 | ||
7760 | -- Start of processing | |
70482933 RK |
7761 | |
7762 | begin | |
7763 | if Is_Access_Type (Target_Type) then | |
8cea7b64 HK |
7764 | Actual_Op_Typ := Designated_Type (Operand_Type); |
7765 | Actual_Targ_Typ := Designated_Type (Target_Type); | |
70482933 RK |
7766 | |
7767 | else | |
8cea7b64 HK |
7768 | Actual_Op_Typ := Operand_Type; |
7769 | Actual_Targ_Typ := Target_Type; | |
70482933 RK |
7770 | end if; |
7771 | ||
8cea7b64 HK |
7772 | Root_Op_Typ := Root_Type (Actual_Op_Typ); |
7773 | ||
20b5d666 JM |
7774 | -- Ada 2005 (AI-251): Handle interface type conversion |
7775 | ||
8cea7b64 | 7776 | if Is_Interface (Actual_Op_Typ) then |
20b5d666 JM |
7777 | Expand_Interface_Conversion (N, Is_Static => False); |
7778 | return; | |
7779 | end if; | |
7780 | ||
8cea7b64 | 7781 | if not Tag_Checks_Suppressed (Actual_Targ_Typ) then |
70482933 | 7782 | |
8cea7b64 HK |
7783 | -- Create a runtime tag check for a downward class-wide type |
7784 | -- conversion. | |
70482933 | 7785 | |
8cea7b64 HK |
7786 | if Is_Class_Wide_Type (Actual_Op_Typ) |
7787 | and then Root_Op_Typ /= Actual_Targ_Typ | |
7788 | and then Is_Ancestor (Root_Op_Typ, Actual_Targ_Typ) | |
7789 | then | |
7790 | Make_Tag_Check (Class_Wide_Type (Actual_Targ_Typ)); | |
7791 | Make_Conversion := True; | |
7792 | end if; | |
70482933 | 7793 | |
8cea7b64 HK |
7794 | -- AI05-0073: If the result subtype of the function is defined |
7795 | -- by an access_definition designating a specific tagged type | |
7796 | -- T, a check is made that the result value is null or the tag | |
7797 | -- of the object designated by the result value identifies T. | |
7798 | -- Constraint_Error is raised if this check fails. | |
70482933 | 7799 | |
8cea7b64 HK |
7800 | if Nkind (Parent (N)) = Sinfo.N_Return_Statement then |
7801 | declare | |
e886436a | 7802 | Func : Entity_Id; |
8cea7b64 HK |
7803 | Func_Typ : Entity_Id; |
7804 | ||
7805 | begin | |
e886436a | 7806 | -- Climb scope stack looking for the enclosing function |
8cea7b64 | 7807 | |
e886436a | 7808 | Func := Current_Scope; |
8cea7b64 HK |
7809 | while Present (Func) |
7810 | and then Ekind (Func) /= E_Function | |
7811 | loop | |
7812 | Func := Scope (Func); | |
7813 | end loop; | |
7814 | ||
7815 | -- The function's return subtype must be defined using | |
7816 | -- an access definition. | |
7817 | ||
7818 | if Nkind (Result_Definition (Parent (Func))) = | |
7819 | N_Access_Definition | |
7820 | then | |
7821 | Func_Typ := Directly_Designated_Type (Etype (Func)); | |
7822 | ||
7823 | -- The return subtype denotes a specific tagged type, | |
7824 | -- in other words, a non class-wide type. | |
7825 | ||
7826 | if Is_Tagged_Type (Func_Typ) | |
7827 | and then not Is_Class_Wide_Type (Func_Typ) | |
7828 | then | |
7829 | Make_Tag_Check (Actual_Targ_Typ); | |
7830 | Make_Conversion := True; | |
7831 | end if; | |
7832 | end if; | |
7833 | end; | |
70482933 RK |
7834 | end if; |
7835 | ||
8cea7b64 HK |
7836 | -- We have generated a tag check for either a class-wide type |
7837 | -- conversion or for AI05-0073. | |
70482933 | 7838 | |
8cea7b64 HK |
7839 | if Make_Conversion then |
7840 | declare | |
7841 | Conv : Node_Id; | |
7842 | begin | |
7843 | Conv := | |
7844 | Make_Unchecked_Type_Conversion (Loc, | |
7845 | Subtype_Mark => New_Occurrence_Of (Target_Type, Loc), | |
7846 | Expression => Relocate_Node (Expression (N))); | |
7847 | Rewrite (N, Conv); | |
7848 | Analyze_And_Resolve (N, Target_Type); | |
7849 | end; | |
7850 | end if; | |
70482933 RK |
7851 | end if; |
7852 | end; | |
7853 | ||
7854 | -- Case of other access type conversions | |
7855 | ||
7856 | elsif Is_Access_Type (Target_Type) then | |
7857 | Apply_Constraint_Check (Operand, Target_Type); | |
7858 | ||
7859 | -- Case of conversions from a fixed-point type | |
7860 | ||
685094bf RD |
7861 | -- These conversions require special expansion and processing, found in |
7862 | -- the Exp_Fixd package. We ignore cases where Conversion_OK is set, | |
7863 | -- since from a semantic point of view, these are simple integer | |
70482933 RK |
7864 | -- conversions, which do not need further processing. |
7865 | ||
7866 | elsif Is_Fixed_Point_Type (Operand_Type) | |
7867 | and then not Conversion_OK (N) | |
7868 | then | |
7869 | -- We should never see universal fixed at this case, since the | |
7870 | -- expansion of the constituent divide or multiply should have | |
7871 | -- eliminated the explicit mention of universal fixed. | |
7872 | ||
7873 | pragma Assert (Operand_Type /= Universal_Fixed); | |
7874 | ||
685094bf RD |
7875 | -- Check for special case of the conversion to universal real that |
7876 | -- occurs as a result of the use of a round attribute. In this case, | |
7877 | -- the real type for the conversion is taken from the target type of | |
7878 | -- the Round attribute and the result must be marked as rounded. | |
70482933 RK |
7879 | |
7880 | if Target_Type = Universal_Real | |
7881 | and then Nkind (Parent (N)) = N_Attribute_Reference | |
7882 | and then Attribute_Name (Parent (N)) = Name_Round | |
7883 | then | |
7884 | Set_Rounded_Result (N); | |
7885 | Set_Etype (N, Etype (Parent (N))); | |
7886 | end if; | |
7887 | ||
7888 | -- Otherwise do correct fixed-conversion, but skip these if the | |
7889 | -- Conversion_OK flag is set, because from a semantic point of | |
7890 | -- view these are simple integer conversions needing no further | |
7891 | -- processing (the backend will simply treat them as integers) | |
7892 | ||
7893 | if not Conversion_OK (N) then | |
7894 | if Is_Fixed_Point_Type (Etype (N)) then | |
7895 | Expand_Convert_Fixed_To_Fixed (N); | |
7896 | Real_Range_Check; | |
7897 | ||
7898 | elsif Is_Integer_Type (Etype (N)) then | |
7899 | Expand_Convert_Fixed_To_Integer (N); | |
7900 | ||
7901 | else | |
7902 | pragma Assert (Is_Floating_Point_Type (Etype (N))); | |
7903 | Expand_Convert_Fixed_To_Float (N); | |
7904 | Real_Range_Check; | |
7905 | end if; | |
7906 | end if; | |
7907 | ||
7908 | -- Case of conversions to a fixed-point type | |
7909 | ||
685094bf RD |
7910 | -- These conversions require special expansion and processing, found in |
7911 | -- the Exp_Fixd package. Again, ignore cases where Conversion_OK is set, | |
7912 | -- since from a semantic point of view, these are simple integer | |
7913 | -- conversions, which do not need further processing. | |
70482933 RK |
7914 | |
7915 | elsif Is_Fixed_Point_Type (Target_Type) | |
7916 | and then not Conversion_OK (N) | |
7917 | then | |
7918 | if Is_Integer_Type (Operand_Type) then | |
7919 | Expand_Convert_Integer_To_Fixed (N); | |
7920 | Real_Range_Check; | |
7921 | else | |
7922 | pragma Assert (Is_Floating_Point_Type (Operand_Type)); | |
7923 | Expand_Convert_Float_To_Fixed (N); | |
7924 | Real_Range_Check; | |
7925 | end if; | |
7926 | ||
7927 | -- Case of float-to-integer conversions | |
7928 | ||
7929 | -- We also handle float-to-fixed conversions with Conversion_OK set | |
7930 | -- since semantically the fixed-point target is treated as though it | |
7931 | -- were an integer in such cases. | |
7932 | ||
7933 | elsif Is_Floating_Point_Type (Operand_Type) | |
7934 | and then | |
7935 | (Is_Integer_Type (Target_Type) | |
7936 | or else | |
7937 | (Is_Fixed_Point_Type (Target_Type) and then Conversion_OK (N))) | |
7938 | then | |
fad0600d AC |
7939 | -- Handle case in which type conversions from real types to integers |
7940 | -- are truncated instead of rounded. For example, in the .NET target | |
7941 | -- the only instructions available for conversion from float types to | |
7942 | -- integers truncate the result. That is, the result of Integer (3.9) | |
7943 | -- is 3 instead of 4. The frontend expansion done here to handle also | |
7944 | -- negative values is the following composition of conditional | |
7945 | -- expressions: | |
7946 | ||
7947 | -- (if Abs (Operand - Float(Integer(Operand))) >= 0.5 then | |
7948 | -- (if Operand >= 0.0 then | |
7949 | -- Integer(Operand) + 1 | |
7950 | -- else | |
7951 | -- Integer(Operand) - 1) | |
7952 | -- else | |
7953 | -- Integer(Operand)) | |
7954 | ||
7955 | if Integer_Truncation_On_Target and then Comes_From_Source (N) then | |
7956 | declare | |
7957 | Conv_Node : Node_Id; | |
7958 | ||
7959 | begin | |
7960 | -- This code is weird, why are we doing all these copy tree | |
7961 | -- operations, instead of just capturing Integer(Operand) | |
7962 | -- once and then reusing the value instead of forcing this | |
7963 | -- conversion to be done four times! ??? | |
7964 | ||
7965 | -- There should be no New_Copy_Tree operations in the below | |
7966 | -- code at all??? | |
7967 | ||
7968 | Conv_Node := New_Copy_Tree (N); | |
7969 | Set_Parent (Conv_Node, Parent (N)); | |
7970 | Set_Comes_From_Source (Conv_Node, False); | |
7971 | Analyze_And_Resolve (Conv_Node, Target_Type); | |
7972 | ||
7973 | Rewrite (N, | |
7974 | Make_Conditional_Expression (Loc, | |
7975 | Expressions => New_List ( | |
7976 | Make_Op_Ge (Loc, | |
7977 | Left_Opnd => | |
7978 | Make_Op_Abs (Loc, | |
7979 | Make_Op_Subtract (Loc, | |
7980 | New_Copy_Tree (Operand), | |
7981 | Make_Type_Conversion (Loc, | |
7982 | New_Reference_To (Etype (Operand), Loc), | |
7983 | New_Copy_Tree (Conv_Node)))), | |
7984 | Right_Opnd => Make_Real_Literal (Loc, Ureal_Half)), | |
7985 | ||
7986 | Make_Conditional_Expression (Loc, | |
7987 | Expressions => New_List ( | |
7988 | Make_Op_Ge (Loc, | |
7989 | Left_Opnd => New_Copy_Tree (Operand), | |
7990 | Right_Opnd => Make_Real_Literal (Loc, Ureal_0)), | |
7991 | Make_Op_Add (Loc, | |
7992 | New_Copy_Tree (Conv_Node), | |
7993 | Make_Integer_Literal (Loc, 1)), | |
7994 | Make_Op_Subtract (Loc, | |
7995 | New_Copy_Tree (Conv_Node), | |
7996 | Make_Integer_Literal (Loc, 1)))), | |
7997 | ||
7998 | New_Copy_Tree (Conv_Node)))); | |
7999 | ||
8000 | Analyze_And_Resolve (N, Target_Type); | |
8001 | return; | |
8002 | end; | |
8003 | end if; | |
8004 | ||
70482933 RK |
8005 | -- One more check here, gcc is still not able to do conversions of |
8006 | -- this type with proper overflow checking, and so gigi is doing an | |
8007 | -- approximation of what is required by doing floating-point compares | |
8008 | -- with the end-point. But that can lose precision in some cases, and | |
f02b8bb8 | 8009 | -- give a wrong result. Converting the operand to Universal_Real is |
70482933 | 8010 | -- helpful, but still does not catch all cases with 64-bit integers |
0669bebe GB |
8011 | -- on targets with only 64-bit floats |
8012 | ||
8013 | -- The above comment seems obsoleted by Apply_Float_Conversion_Check | |
8014 | -- Can this code be removed ??? | |
70482933 | 8015 | |
fbf5a39b AC |
8016 | if Do_Range_Check (Operand) then |
8017 | Rewrite (Operand, | |
70482933 RK |
8018 | Make_Type_Conversion (Loc, |
8019 | Subtype_Mark => | |
f02b8bb8 | 8020 | New_Occurrence_Of (Universal_Real, Loc), |
70482933 | 8021 | Expression => |
fbf5a39b | 8022 | Relocate_Node (Operand))); |
70482933 | 8023 | |
f02b8bb8 | 8024 | Set_Etype (Operand, Universal_Real); |
fbf5a39b AC |
8025 | Enable_Range_Check (Operand); |
8026 | Set_Do_Range_Check (Expression (Operand), False); | |
70482933 RK |
8027 | end if; |
8028 | ||
8029 | -- Case of array conversions | |
8030 | ||
685094bf RD |
8031 | -- Expansion of array conversions, add required length/range checks but |
8032 | -- only do this if there is no change of representation. For handling of | |
8033 | -- this case, see Handle_Changed_Representation. | |
70482933 RK |
8034 | |
8035 | elsif Is_Array_Type (Target_Type) then | |
8036 | ||
8037 | if Is_Constrained (Target_Type) then | |
8038 | Apply_Length_Check (Operand, Target_Type); | |
8039 | else | |
8040 | Apply_Range_Check (Operand, Target_Type); | |
8041 | end if; | |
8042 | ||
8043 | Handle_Changed_Representation; | |
8044 | ||
8045 | -- Case of conversions of discriminated types | |
8046 | ||
685094bf RD |
8047 | -- Add required discriminant checks if target is constrained. Again this |
8048 | -- change is skipped if we have a change of representation. | |
70482933 RK |
8049 | |
8050 | elsif Has_Discriminants (Target_Type) | |
8051 | and then Is_Constrained (Target_Type) | |
8052 | then | |
8053 | Apply_Discriminant_Check (Operand, Target_Type); | |
8054 | Handle_Changed_Representation; | |
8055 | ||
8056 | -- Case of all other record conversions. The only processing required | |
8057 | -- is to check for a change of representation requiring the special | |
8058 | -- assignment processing. | |
8059 | ||
8060 | elsif Is_Record_Type (Target_Type) then | |
5d09245e AC |
8061 | |
8062 | -- Ada 2005 (AI-216): Program_Error is raised when converting from | |
685094bf RD |
8063 | -- a derived Unchecked_Union type to an unconstrained type that is |
8064 | -- not Unchecked_Union if the operand lacks inferable discriminants. | |
5d09245e AC |
8065 | |
8066 | if Is_Derived_Type (Operand_Type) | |
8067 | and then Is_Unchecked_Union (Base_Type (Operand_Type)) | |
8068 | and then not Is_Constrained (Target_Type) | |
8069 | and then not Is_Unchecked_Union (Base_Type (Target_Type)) | |
8070 | and then not Has_Inferable_Discriminants (Operand) | |
8071 | then | |
685094bf | 8072 | -- To prevent Gigi from generating illegal code, we generate a |
5d09245e AC |
8073 | -- Program_Error node, but we give it the target type of the |
8074 | -- conversion. | |
8075 | ||
8076 | declare | |
8077 | PE : constant Node_Id := Make_Raise_Program_Error (Loc, | |
8078 | Reason => PE_Unchecked_Union_Restriction); | |
8079 | ||
8080 | begin | |
8081 | Set_Etype (PE, Target_Type); | |
8082 | Rewrite (N, PE); | |
8083 | ||
8084 | end; | |
8085 | else | |
8086 | Handle_Changed_Representation; | |
8087 | end if; | |
70482933 RK |
8088 | |
8089 | -- Case of conversions of enumeration types | |
8090 | ||
8091 | elsif Is_Enumeration_Type (Target_Type) then | |
8092 | ||
8093 | -- Special processing is required if there is a change of | |
8094 | -- representation (from enumeration representation clauses) | |
8095 | ||
8096 | if not Same_Representation (Target_Type, Operand_Type) then | |
8097 | ||
8098 | -- Convert: x(y) to x'val (ytyp'val (y)) | |
8099 | ||
8100 | Rewrite (N, | |
8101 | Make_Attribute_Reference (Loc, | |
8102 | Prefix => New_Occurrence_Of (Target_Type, Loc), | |
8103 | Attribute_Name => Name_Val, | |
8104 | Expressions => New_List ( | |
8105 | Make_Attribute_Reference (Loc, | |
8106 | Prefix => New_Occurrence_Of (Operand_Type, Loc), | |
8107 | Attribute_Name => Name_Pos, | |
8108 | Expressions => New_List (Operand))))); | |
8109 | ||
8110 | Analyze_And_Resolve (N, Target_Type); | |
8111 | end if; | |
8112 | ||
8113 | -- Case of conversions to floating-point | |
8114 | ||
8115 | elsif Is_Floating_Point_Type (Target_Type) then | |
8116 | Real_Range_Check; | |
70482933 RK |
8117 | end if; |
8118 | ||
685094bf RD |
8119 | -- At this stage, either the conversion node has been transformed into |
8120 | -- some other equivalent expression, or left as a conversion that can | |
8121 | -- be handled by Gigi. The conversions that Gigi can handle are the | |
8122 | -- following: | |
70482933 RK |
8123 | |
8124 | -- Conversions with no change of representation or type | |
8125 | ||
685094bf RD |
8126 | -- Numeric conversions involving integer, floating- and fixed-point |
8127 | -- values. Fixed-point values are allowed only if Conversion_OK is | |
8128 | -- set, i.e. if the fixed-point values are to be treated as integers. | |
70482933 | 8129 | |
5e1c00fa RD |
8130 | -- No other conversions should be passed to Gigi |
8131 | ||
8132 | -- Check: are these rules stated in sinfo??? if so, why restate here??? | |
70482933 | 8133 | |
685094bf RD |
8134 | -- The only remaining step is to generate a range check if we still have |
8135 | -- a type conversion at this stage and Do_Range_Check is set. For now we | |
8136 | -- do this only for conversions of discrete types. | |
fbf5a39b AC |
8137 | |
8138 | if Nkind (N) = N_Type_Conversion | |
8139 | and then Is_Discrete_Type (Etype (N)) | |
8140 | then | |
8141 | declare | |
8142 | Expr : constant Node_Id := Expression (N); | |
8143 | Ftyp : Entity_Id; | |
8144 | Ityp : Entity_Id; | |
8145 | ||
8146 | begin | |
8147 | if Do_Range_Check (Expr) | |
8148 | and then Is_Discrete_Type (Etype (Expr)) | |
8149 | then | |
8150 | Set_Do_Range_Check (Expr, False); | |
8151 | ||
685094bf RD |
8152 | -- Before we do a range check, we have to deal with treating a |
8153 | -- fixed-point operand as an integer. The way we do this is | |
8154 | -- simply to do an unchecked conversion to an appropriate | |
fbf5a39b AC |
8155 | -- integer type large enough to hold the result. |
8156 | ||
8157 | -- This code is not active yet, because we are only dealing | |
8158 | -- with discrete types so far ??? | |
8159 | ||
8160 | if Nkind (Expr) in N_Has_Treat_Fixed_As_Integer | |
8161 | and then Treat_Fixed_As_Integer (Expr) | |
8162 | then | |
8163 | Ftyp := Base_Type (Etype (Expr)); | |
8164 | ||
8165 | if Esize (Ftyp) >= Esize (Standard_Integer) then | |
8166 | Ityp := Standard_Long_Long_Integer; | |
8167 | else | |
8168 | Ityp := Standard_Integer; | |
8169 | end if; | |
8170 | ||
8171 | Rewrite (Expr, Unchecked_Convert_To (Ityp, Expr)); | |
8172 | end if; | |
8173 | ||
8174 | -- Reset overflow flag, since the range check will include | |
685094bf RD |
8175 | -- dealing with possible overflow, and generate the check If |
8176 | -- Address is either a source type or target type, suppress | |
8a36a0cc AC |
8177 | -- range check to avoid typing anomalies when it is a visible |
8178 | -- integer type. | |
fbf5a39b AC |
8179 | |
8180 | Set_Do_Overflow_Check (N, False); | |
8a36a0cc AC |
8181 | if not Is_Descendent_Of_Address (Etype (Expr)) |
8182 | and then not Is_Descendent_Of_Address (Target_Type) | |
8183 | then | |
8184 | Generate_Range_Check | |
8185 | (Expr, Target_Type, CE_Range_Check_Failed); | |
8186 | end if; | |
fbf5a39b AC |
8187 | end if; |
8188 | end; | |
8189 | end if; | |
f02b8bb8 RD |
8190 | |
8191 | -- Final step, if the result is a type conversion involving Vax_Float | |
8192 | -- types, then it is subject for further special processing. | |
8193 | ||
8194 | if Nkind (N) = N_Type_Conversion | |
8195 | and then (Vax_Float (Operand_Type) or else Vax_Float (Target_Type)) | |
8196 | then | |
8197 | Expand_Vax_Conversion (N); | |
8198 | return; | |
8199 | end if; | |
70482933 RK |
8200 | end Expand_N_Type_Conversion; |
8201 | ||
8202 | ----------------------------------- | |
8203 | -- Expand_N_Unchecked_Expression -- | |
8204 | ----------------------------------- | |
8205 | ||
8206 | -- Remove the unchecked expression node from the tree. It's job was simply | |
8207 | -- to make sure that its constituent expression was handled with checks | |
8208 | -- off, and now that that is done, we can remove it from the tree, and | |
8209 | -- indeed must, since gigi does not expect to see these nodes. | |
8210 | ||
8211 | procedure Expand_N_Unchecked_Expression (N : Node_Id) is | |
8212 | Exp : constant Node_Id := Expression (N); | |
8213 | ||
8214 | begin | |
8215 | Set_Assignment_OK (Exp, Assignment_OK (N) or Assignment_OK (Exp)); | |
8216 | Rewrite (N, Exp); | |
8217 | end Expand_N_Unchecked_Expression; | |
8218 | ||
8219 | ---------------------------------------- | |
8220 | -- Expand_N_Unchecked_Type_Conversion -- | |
8221 | ---------------------------------------- | |
8222 | ||
685094bf RD |
8223 | -- If this cannot be handled by Gigi and we haven't already made a |
8224 | -- temporary for it, do it now. | |
70482933 RK |
8225 | |
8226 | procedure Expand_N_Unchecked_Type_Conversion (N : Node_Id) is | |
8227 | Target_Type : constant Entity_Id := Etype (N); | |
8228 | Operand : constant Node_Id := Expression (N); | |
8229 | Operand_Type : constant Entity_Id := Etype (Operand); | |
8230 | ||
8231 | begin | |
8232 | -- If we have a conversion of a compile time known value to a target | |
8233 | -- type and the value is in range of the target type, then we can simply | |
8234 | -- replace the construct by an integer literal of the correct type. We | |
8235 | -- only apply this to integer types being converted. Possibly it may | |
8236 | -- apply in other cases, but it is too much trouble to worry about. | |
8237 | ||
8238 | -- Note that we do not do this transformation if the Kill_Range_Check | |
8239 | -- flag is set, since then the value may be outside the expected range. | |
8240 | -- This happens in the Normalize_Scalars case. | |
8241 | ||
20b5d666 JM |
8242 | -- We also skip this if either the target or operand type is biased |
8243 | -- because in this case, the unchecked conversion is supposed to | |
8244 | -- preserve the bit pattern, not the integer value. | |
8245 | ||
70482933 | 8246 | if Is_Integer_Type (Target_Type) |
20b5d666 | 8247 | and then not Has_Biased_Representation (Target_Type) |
70482933 | 8248 | and then Is_Integer_Type (Operand_Type) |
20b5d666 | 8249 | and then not Has_Biased_Representation (Operand_Type) |
70482933 RK |
8250 | and then Compile_Time_Known_Value (Operand) |
8251 | and then not Kill_Range_Check (N) | |
8252 | then | |
8253 | declare | |
8254 | Val : constant Uint := Expr_Value (Operand); | |
8255 | ||
8256 | begin | |
8257 | if Compile_Time_Known_Value (Type_Low_Bound (Target_Type)) | |
8258 | and then | |
8259 | Compile_Time_Known_Value (Type_High_Bound (Target_Type)) | |
8260 | and then | |
8261 | Val >= Expr_Value (Type_Low_Bound (Target_Type)) | |
8262 | and then | |
8263 | Val <= Expr_Value (Type_High_Bound (Target_Type)) | |
8264 | then | |
8265 | Rewrite (N, Make_Integer_Literal (Sloc (N), Val)); | |
8a36a0cc | 8266 | |
685094bf RD |
8267 | -- If Address is the target type, just set the type to avoid a |
8268 | -- spurious type error on the literal when Address is a visible | |
8269 | -- integer type. | |
8a36a0cc AC |
8270 | |
8271 | if Is_Descendent_Of_Address (Target_Type) then | |
8272 | Set_Etype (N, Target_Type); | |
8273 | else | |
8274 | Analyze_And_Resolve (N, Target_Type); | |
8275 | end if; | |
8276 | ||
70482933 RK |
8277 | return; |
8278 | end if; | |
8279 | end; | |
8280 | end if; | |
8281 | ||
8282 | -- Nothing to do if conversion is safe | |
8283 | ||
8284 | if Safe_Unchecked_Type_Conversion (N) then | |
8285 | return; | |
8286 | end if; | |
8287 | ||
8288 | -- Otherwise force evaluation unless Assignment_OK flag is set (this | |
8289 | -- flag indicates ??? -- more comments needed here) | |
8290 | ||
8291 | if Assignment_OK (N) then | |
8292 | null; | |
8293 | else | |
8294 | Force_Evaluation (N); | |
8295 | end if; | |
8296 | end Expand_N_Unchecked_Type_Conversion; | |
8297 | ||
8298 | ---------------------------- | |
8299 | -- Expand_Record_Equality -- | |
8300 | ---------------------------- | |
8301 | ||
8302 | -- For non-variant records, Equality is expanded when needed into: | |
8303 | ||
8304 | -- and then Lhs.Discr1 = Rhs.Discr1 | |
8305 | -- and then ... | |
8306 | -- and then Lhs.Discrn = Rhs.Discrn | |
8307 | -- and then Lhs.Cmp1 = Rhs.Cmp1 | |
8308 | -- and then ... | |
8309 | -- and then Lhs.Cmpn = Rhs.Cmpn | |
8310 | ||
8311 | -- The expression is folded by the back-end for adjacent fields. This | |
8312 | -- function is called for tagged record in only one occasion: for imple- | |
8313 | -- menting predefined primitive equality (see Predefined_Primitives_Bodies) | |
8314 | -- otherwise the primitive "=" is used directly. | |
8315 | ||
8316 | function Expand_Record_Equality | |
8317 | (Nod : Node_Id; | |
8318 | Typ : Entity_Id; | |
8319 | Lhs : Node_Id; | |
8320 | Rhs : Node_Id; | |
2e071734 | 8321 | Bodies : List_Id) return Node_Id |
70482933 RK |
8322 | is |
8323 | Loc : constant Source_Ptr := Sloc (Nod); | |
8324 | ||
0ab80019 AC |
8325 | Result : Node_Id; |
8326 | C : Entity_Id; | |
8327 | ||
8328 | First_Time : Boolean := True; | |
8329 | ||
70482933 RK |
8330 | function Suitable_Element (C : Entity_Id) return Entity_Id; |
8331 | -- Return the first field to compare beginning with C, skipping the | |
0ab80019 AC |
8332 | -- inherited components. |
8333 | ||
8334 | ---------------------- | |
8335 | -- Suitable_Element -- | |
8336 | ---------------------- | |
70482933 RK |
8337 | |
8338 | function Suitable_Element (C : Entity_Id) return Entity_Id is | |
8339 | begin | |
8340 | if No (C) then | |
8341 | return Empty; | |
8342 | ||
8343 | elsif Ekind (C) /= E_Discriminant | |
8344 | and then Ekind (C) /= E_Component | |
8345 | then | |
8346 | return Suitable_Element (Next_Entity (C)); | |
8347 | ||
8348 | elsif Is_Tagged_Type (Typ) | |
8349 | and then C /= Original_Record_Component (C) | |
8350 | then | |
8351 | return Suitable_Element (Next_Entity (C)); | |
8352 | ||
8353 | elsif Chars (C) = Name_uController | |
8354 | or else Chars (C) = Name_uTag | |
8355 | then | |
8356 | return Suitable_Element (Next_Entity (C)); | |
8357 | ||
26bff3d9 JM |
8358 | elsif Is_Interface (Etype (C)) then |
8359 | return Suitable_Element (Next_Entity (C)); | |
8360 | ||
70482933 RK |
8361 | else |
8362 | return C; | |
8363 | end if; | |
8364 | end Suitable_Element; | |
8365 | ||
70482933 RK |
8366 | -- Start of processing for Expand_Record_Equality |
8367 | ||
8368 | begin | |
70482933 RK |
8369 | -- Generates the following code: (assuming that Typ has one Discr and |
8370 | -- component C2 is also a record) | |
8371 | ||
8372 | -- True | |
8373 | -- and then Lhs.Discr1 = Rhs.Discr1 | |
8374 | -- and then Lhs.C1 = Rhs.C1 | |
8375 | -- and then Lhs.C2.C1=Rhs.C2.C1 and then ... Lhs.C2.Cn=Rhs.C2.Cn | |
8376 | -- and then ... | |
8377 | -- and then Lhs.Cmpn = Rhs.Cmpn | |
8378 | ||
8379 | Result := New_Reference_To (Standard_True, Loc); | |
8380 | C := Suitable_Element (First_Entity (Typ)); | |
8381 | ||
8382 | while Present (C) loop | |
70482933 RK |
8383 | declare |
8384 | New_Lhs : Node_Id; | |
8385 | New_Rhs : Node_Id; | |
8aceda64 | 8386 | Check : Node_Id; |
70482933 RK |
8387 | |
8388 | begin | |
8389 | if First_Time then | |
8390 | First_Time := False; | |
8391 | New_Lhs := Lhs; | |
8392 | New_Rhs := Rhs; | |
70482933 RK |
8393 | else |
8394 | New_Lhs := New_Copy_Tree (Lhs); | |
8395 | New_Rhs := New_Copy_Tree (Rhs); | |
8396 | end if; | |
8397 | ||
8aceda64 AC |
8398 | Check := |
8399 | Expand_Composite_Equality (Nod, Etype (C), | |
8400 | Lhs => | |
8401 | Make_Selected_Component (Loc, | |
8402 | Prefix => New_Lhs, | |
8403 | Selector_Name => New_Reference_To (C, Loc)), | |
8404 | Rhs => | |
8405 | Make_Selected_Component (Loc, | |
8406 | Prefix => New_Rhs, | |
8407 | Selector_Name => New_Reference_To (C, Loc)), | |
8408 | Bodies => Bodies); | |
8409 | ||
8410 | -- If some (sub)component is an unchecked_union, the whole | |
8411 | -- operation will raise program error. | |
8412 | ||
8413 | if Nkind (Check) = N_Raise_Program_Error then | |
8414 | Result := Check; | |
8415 | Set_Etype (Result, Standard_Boolean); | |
8416 | exit; | |
8417 | else | |
8418 | Result := | |
8419 | Make_And_Then (Loc, | |
8420 | Left_Opnd => Result, | |
8421 | Right_Opnd => Check); | |
8422 | end if; | |
70482933 RK |
8423 | end; |
8424 | ||
8425 | C := Suitable_Element (Next_Entity (C)); | |
8426 | end loop; | |
8427 | ||
8428 | return Result; | |
8429 | end Expand_Record_Equality; | |
8430 | ||
8431 | ------------------------------------- | |
8432 | -- Fixup_Universal_Fixed_Operation -- | |
8433 | ------------------------------------- | |
8434 | ||
8435 | procedure Fixup_Universal_Fixed_Operation (N : Node_Id) is | |
8436 | Conv : constant Node_Id := Parent (N); | |
8437 | ||
8438 | begin | |
8439 | -- We must have a type conversion immediately above us | |
8440 | ||
8441 | pragma Assert (Nkind (Conv) = N_Type_Conversion); | |
8442 | ||
8443 | -- Normally the type conversion gives our target type. The exception | |
8444 | -- occurs in the case of the Round attribute, where the conversion | |
8445 | -- will be to universal real, and our real type comes from the Round | |
8446 | -- attribute (as well as an indication that we must round the result) | |
8447 | ||
8448 | if Nkind (Parent (Conv)) = N_Attribute_Reference | |
8449 | and then Attribute_Name (Parent (Conv)) = Name_Round | |
8450 | then | |
8451 | Set_Etype (N, Etype (Parent (Conv))); | |
8452 | Set_Rounded_Result (N); | |
8453 | ||
8454 | -- Normal case where type comes from conversion above us | |
8455 | ||
8456 | else | |
8457 | Set_Etype (N, Etype (Conv)); | |
8458 | end if; | |
8459 | end Fixup_Universal_Fixed_Operation; | |
8460 | ||
fbf5a39b AC |
8461 | ------------------------------ |
8462 | -- Get_Allocator_Final_List -- | |
8463 | ------------------------------ | |
8464 | ||
8465 | function Get_Allocator_Final_List | |
8466 | (N : Node_Id; | |
8467 | T : Entity_Id; | |
2e071734 | 8468 | PtrT : Entity_Id) return Entity_Id |
fbf5a39b AC |
8469 | is |
8470 | Loc : constant Source_Ptr := Sloc (N); | |
fbf5a39b | 8471 | |
0da2c8ac | 8472 | Owner : Entity_Id := PtrT; |
26bff3d9 | 8473 | -- The entity whose finalization list must be used to attach the |
0da2c8ac | 8474 | -- allocated object. |
fbf5a39b | 8475 | |
0da2c8ac | 8476 | begin |
fbf5a39b | 8477 | if Ekind (PtrT) = E_Anonymous_Access_Type then |
26bff3d9 JM |
8478 | |
8479 | -- If the context is an access parameter, we need to create a | |
8480 | -- non-anonymous access type in order to have a usable final list, | |
8481 | -- because there is otherwise no pool to which the allocated object | |
8482 | -- can belong. We create both the type and the finalization chain | |
8483 | -- here, because freezing an internal type does not create such a | |
8484 | -- chain. The Final_Chain that is thus created is shared by the | |
8485 | -- access parameter. The access type is tested against the result | |
8486 | -- type of the function to exclude allocators whose type is an | |
8654a240 | 8487 | -- anonymous access result type. We freeze the type at once to |
9450205a ES |
8488 | -- ensure that it is properly decorated for the back-end, even |
8489 | -- if the context and current scope is a loop. | |
26bff3d9 | 8490 | |
0da2c8ac AC |
8491 | if Nkind (Associated_Node_For_Itype (PtrT)) |
8492 | in N_Subprogram_Specification | |
26bff3d9 JM |
8493 | and then |
8494 | PtrT /= | |
8495 | Etype (Defining_Unit_Name (Associated_Node_For_Itype (PtrT))) | |
0da2c8ac | 8496 | then |
0da2c8ac AC |
8497 | Owner := Make_Defining_Identifier (Loc, New_Internal_Name ('J')); |
8498 | Insert_Action (N, | |
8499 | Make_Full_Type_Declaration (Loc, | |
8500 | Defining_Identifier => Owner, | |
8501 | Type_Definition => | |
8502 | Make_Access_To_Object_Definition (Loc, | |
8503 | Subtype_Indication => | |
8504 | New_Occurrence_Of (T, Loc)))); | |
fbf5a39b | 8505 | |
9450205a | 8506 | Freeze_Before (N, Owner); |
0da2c8ac AC |
8507 | Build_Final_List (N, Owner); |
8508 | Set_Associated_Final_Chain (PtrT, Associated_Final_Chain (Owner)); | |
fbf5a39b | 8509 | |
26bff3d9 JM |
8510 | -- Ada 2005 (AI-318-02): If the context is a return object |
8511 | -- declaration, then the anonymous return subtype is defined to have | |
8512 | -- the same accessibility level as that of the function's result | |
8513 | -- subtype, which means that we want the scope where the function is | |
8514 | -- declared. | |
8515 | ||
8516 | elsif Nkind (Associated_Node_For_Itype (PtrT)) = N_Object_Declaration | |
8517 | and then Ekind (Scope (PtrT)) = E_Return_Statement | |
8518 | then | |
8519 | Owner := Scope (Return_Applies_To (Scope (PtrT))); | |
8520 | ||
8521 | -- Case of an access discriminant, or (Ada 2005), of an anonymous | |
8522 | -- access component or anonymous access function result: find the | |
d766cee3 RD |
8523 | -- final list associated with the scope of the type. (In the |
8524 | -- anonymous access component kind, a list controller will have | |
8525 | -- been allocated when freezing the record type, and PtrT has an | |
8526 | -- Associated_Final_Chain attribute designating it.) | |
0da2c8ac | 8527 | |
d766cee3 | 8528 | elsif No (Associated_Final_Chain (PtrT)) then |
0da2c8ac AC |
8529 | Owner := Scope (PtrT); |
8530 | end if; | |
fbf5a39b | 8531 | end if; |
0da2c8ac AC |
8532 | |
8533 | return Find_Final_List (Owner); | |
fbf5a39b AC |
8534 | end Get_Allocator_Final_List; |
8535 | ||
5d09245e AC |
8536 | --------------------------------- |
8537 | -- Has_Inferable_Discriminants -- | |
8538 | --------------------------------- | |
8539 | ||
8540 | function Has_Inferable_Discriminants (N : Node_Id) return Boolean is | |
8541 | ||
8542 | function Prefix_Is_Formal_Parameter (N : Node_Id) return Boolean; | |
8543 | -- Determines whether the left-most prefix of a selected component is a | |
8544 | -- formal parameter in a subprogram. Assumes N is a selected component. | |
8545 | ||
8546 | -------------------------------- | |
8547 | -- Prefix_Is_Formal_Parameter -- | |
8548 | -------------------------------- | |
8549 | ||
8550 | function Prefix_Is_Formal_Parameter (N : Node_Id) return Boolean is | |
8551 | Sel_Comp : Node_Id := N; | |
8552 | ||
8553 | begin | |
8554 | -- Move to the left-most prefix by climbing up the tree | |
8555 | ||
8556 | while Present (Parent (Sel_Comp)) | |
8557 | and then Nkind (Parent (Sel_Comp)) = N_Selected_Component | |
8558 | loop | |
8559 | Sel_Comp := Parent (Sel_Comp); | |
8560 | end loop; | |
8561 | ||
8562 | return Ekind (Entity (Prefix (Sel_Comp))) in Formal_Kind; | |
8563 | end Prefix_Is_Formal_Parameter; | |
8564 | ||
8565 | -- Start of processing for Has_Inferable_Discriminants | |
8566 | ||
8567 | begin | |
8fc789c8 | 8568 | -- For identifiers and indexed components, it is sufficient to have a |
5d09245e AC |
8569 | -- constrained Unchecked_Union nominal subtype. |
8570 | ||
303b4d58 | 8571 | if Nkind_In (N, N_Identifier, N_Indexed_Component) then |
5d09245e AC |
8572 | return Is_Unchecked_Union (Base_Type (Etype (N))) |
8573 | and then | |
8574 | Is_Constrained (Etype (N)); | |
8575 | ||
8576 | -- For selected components, the subtype of the selector must be a | |
8577 | -- constrained Unchecked_Union. If the component is subject to a | |
8578 | -- per-object constraint, then the enclosing object must have inferable | |
8579 | -- discriminants. | |
8580 | ||
8581 | elsif Nkind (N) = N_Selected_Component then | |
8582 | if Has_Per_Object_Constraint (Entity (Selector_Name (N))) then | |
8583 | ||
8584 | -- A small hack. If we have a per-object constrained selected | |
8585 | -- component of a formal parameter, return True since we do not | |
8586 | -- know the actual parameter association yet. | |
8587 | ||
8588 | if Prefix_Is_Formal_Parameter (N) then | |
8589 | return True; | |
8590 | end if; | |
8591 | ||
8592 | -- Otherwise, check the enclosing object and the selector | |
8593 | ||
8594 | return Has_Inferable_Discriminants (Prefix (N)) | |
8595 | and then | |
8596 | Has_Inferable_Discriminants (Selector_Name (N)); | |
8597 | end if; | |
8598 | ||
8599 | -- The call to Has_Inferable_Discriminants will determine whether | |
8600 | -- the selector has a constrained Unchecked_Union nominal type. | |
8601 | ||
8602 | return Has_Inferable_Discriminants (Selector_Name (N)); | |
8603 | ||
8604 | -- A qualified expression has inferable discriminants if its subtype | |
8605 | -- mark is a constrained Unchecked_Union subtype. | |
8606 | ||
8607 | elsif Nkind (N) = N_Qualified_Expression then | |
8608 | return Is_Unchecked_Union (Subtype_Mark (N)) | |
8609 | and then | |
8610 | Is_Constrained (Subtype_Mark (N)); | |
8611 | ||
8612 | end if; | |
8613 | ||
8614 | return False; | |
8615 | end Has_Inferable_Discriminants; | |
8616 | ||
70482933 RK |
8617 | ------------------------------- |
8618 | -- Insert_Dereference_Action -- | |
8619 | ------------------------------- | |
8620 | ||
8621 | procedure Insert_Dereference_Action (N : Node_Id) is | |
8622 | Loc : constant Source_Ptr := Sloc (N); | |
8623 | Typ : constant Entity_Id := Etype (N); | |
8624 | Pool : constant Entity_Id := Associated_Storage_Pool (Typ); | |
0ab80019 | 8625 | Pnod : constant Node_Id := Parent (N); |
70482933 RK |
8626 | |
8627 | function Is_Checked_Storage_Pool (P : Entity_Id) return Boolean; | |
2e071734 AC |
8628 | -- Return true if type of P is derived from Checked_Pool; |
8629 | ||
8630 | ----------------------------- | |
8631 | -- Is_Checked_Storage_Pool -- | |
8632 | ----------------------------- | |
70482933 RK |
8633 | |
8634 | function Is_Checked_Storage_Pool (P : Entity_Id) return Boolean is | |
8635 | T : Entity_Id; | |
8636 | ||
8637 | begin | |
8638 | if No (P) then | |
8639 | return False; | |
8640 | end if; | |
8641 | ||
8642 | T := Etype (P); | |
8643 | while T /= Etype (T) loop | |
8644 | if Is_RTE (T, RE_Checked_Pool) then | |
8645 | return True; | |
8646 | else | |
8647 | T := Etype (T); | |
8648 | end if; | |
8649 | end loop; | |
8650 | ||
8651 | return False; | |
8652 | end Is_Checked_Storage_Pool; | |
8653 | ||
8654 | -- Start of processing for Insert_Dereference_Action | |
8655 | ||
8656 | begin | |
e6f69614 AC |
8657 | pragma Assert (Nkind (Pnod) = N_Explicit_Dereference); |
8658 | ||
0ab80019 AC |
8659 | if not (Is_Checked_Storage_Pool (Pool) |
8660 | and then Comes_From_Source (Original_Node (Pnod))) | |
e6f69614 | 8661 | then |
70482933 | 8662 | return; |
70482933 RK |
8663 | end if; |
8664 | ||
8665 | Insert_Action (N, | |
8666 | Make_Procedure_Call_Statement (Loc, | |
8667 | Name => New_Reference_To ( | |
8668 | Find_Prim_Op (Etype (Pool), Name_Dereference), Loc), | |
8669 | ||
8670 | Parameter_Associations => New_List ( | |
8671 | ||
8672 | -- Pool | |
8673 | ||
8674 | New_Reference_To (Pool, Loc), | |
8675 | ||
685094bf RD |
8676 | -- Storage_Address. We use the attribute Pool_Address, which uses |
8677 | -- the pointer itself to find the address of the object, and which | |
8678 | -- handles unconstrained arrays properly by computing the address | |
8679 | -- of the template. i.e. the correct address of the corresponding | |
8680 | -- allocation. | |
70482933 RK |
8681 | |
8682 | Make_Attribute_Reference (Loc, | |
fbf5a39b AC |
8683 | Prefix => Duplicate_Subexpr_Move_Checks (N), |
8684 | Attribute_Name => Name_Pool_Address), | |
70482933 RK |
8685 | |
8686 | -- Size_In_Storage_Elements | |
8687 | ||
8688 | Make_Op_Divide (Loc, | |
8689 | Left_Opnd => | |
8690 | Make_Attribute_Reference (Loc, | |
8691 | Prefix => | |
fbf5a39b AC |
8692 | Make_Explicit_Dereference (Loc, |
8693 | Duplicate_Subexpr_Move_Checks (N)), | |
70482933 RK |
8694 | Attribute_Name => Name_Size), |
8695 | Right_Opnd => | |
8696 | Make_Integer_Literal (Loc, System_Storage_Unit)), | |
8697 | ||
8698 | -- Alignment | |
8699 | ||
8700 | Make_Attribute_Reference (Loc, | |
8701 | Prefix => | |
fbf5a39b AC |
8702 | Make_Explicit_Dereference (Loc, |
8703 | Duplicate_Subexpr_Move_Checks (N)), | |
70482933 RK |
8704 | Attribute_Name => Name_Alignment)))); |
8705 | ||
fbf5a39b AC |
8706 | exception |
8707 | when RE_Not_Available => | |
8708 | return; | |
70482933 RK |
8709 | end Insert_Dereference_Action; |
8710 | ||
8711 | ------------------------------ | |
8712 | -- Make_Array_Comparison_Op -- | |
8713 | ------------------------------ | |
8714 | ||
8715 | -- This is a hand-coded expansion of the following generic function: | |
8716 | ||
8717 | -- generic | |
8718 | -- type elem is (<>); | |
8719 | -- type index is (<>); | |
8720 | -- type a is array (index range <>) of elem; | |
20b5d666 | 8721 | |
70482933 RK |
8722 | -- function Gnnn (X : a; Y: a) return boolean is |
8723 | -- J : index := Y'first; | |
20b5d666 | 8724 | |
70482933 RK |
8725 | -- begin |
8726 | -- if X'length = 0 then | |
8727 | -- return false; | |
20b5d666 | 8728 | |
70482933 RK |
8729 | -- elsif Y'length = 0 then |
8730 | -- return true; | |
20b5d666 | 8731 | |
70482933 RK |
8732 | -- else |
8733 | -- for I in X'range loop | |
8734 | -- if X (I) = Y (J) then | |
8735 | -- if J = Y'last then | |
8736 | -- exit; | |
8737 | -- else | |
8738 | -- J := index'succ (J); | |
8739 | -- end if; | |
20b5d666 | 8740 | |
70482933 RK |
8741 | -- else |
8742 | -- return X (I) > Y (J); | |
8743 | -- end if; | |
8744 | -- end loop; | |
20b5d666 | 8745 | |
70482933 RK |
8746 | -- return X'length > Y'length; |
8747 | -- end if; | |
8748 | -- end Gnnn; | |
8749 | ||
8750 | -- Note that since we are essentially doing this expansion by hand, we | |
8751 | -- do not need to generate an actual or formal generic part, just the | |
8752 | -- instantiated function itself. | |
8753 | ||
8754 | function Make_Array_Comparison_Op | |
2e071734 AC |
8755 | (Typ : Entity_Id; |
8756 | Nod : Node_Id) return Node_Id | |
70482933 RK |
8757 | is |
8758 | Loc : constant Source_Ptr := Sloc (Nod); | |
8759 | ||
8760 | X : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uX); | |
8761 | Y : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uY); | |
8762 | I : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uI); | |
8763 | J : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uJ); | |
8764 | ||
8765 | Index : constant Entity_Id := Base_Type (Etype (First_Index (Typ))); | |
8766 | ||
8767 | Loop_Statement : Node_Id; | |
8768 | Loop_Body : Node_Id; | |
8769 | If_Stat : Node_Id; | |
8770 | Inner_If : Node_Id; | |
8771 | Final_Expr : Node_Id; | |
8772 | Func_Body : Node_Id; | |
8773 | Func_Name : Entity_Id; | |
8774 | Formals : List_Id; | |
8775 | Length1 : Node_Id; | |
8776 | Length2 : Node_Id; | |
8777 | ||
8778 | begin | |
8779 | -- if J = Y'last then | |
8780 | -- exit; | |
8781 | -- else | |
8782 | -- J := index'succ (J); | |
8783 | -- end if; | |
8784 | ||
8785 | Inner_If := | |
8786 | Make_Implicit_If_Statement (Nod, | |
8787 | Condition => | |
8788 | Make_Op_Eq (Loc, | |
8789 | Left_Opnd => New_Reference_To (J, Loc), | |
8790 | Right_Opnd => | |
8791 | Make_Attribute_Reference (Loc, | |
8792 | Prefix => New_Reference_To (Y, Loc), | |
8793 | Attribute_Name => Name_Last)), | |
8794 | ||
8795 | Then_Statements => New_List ( | |
8796 | Make_Exit_Statement (Loc)), | |
8797 | ||
8798 | Else_Statements => | |
8799 | New_List ( | |
8800 | Make_Assignment_Statement (Loc, | |
8801 | Name => New_Reference_To (J, Loc), | |
8802 | Expression => | |
8803 | Make_Attribute_Reference (Loc, | |
8804 | Prefix => New_Reference_To (Index, Loc), | |
8805 | Attribute_Name => Name_Succ, | |
8806 | Expressions => New_List (New_Reference_To (J, Loc)))))); | |
8807 | ||
8808 | -- if X (I) = Y (J) then | |
8809 | -- if ... end if; | |
8810 | -- else | |
8811 | -- return X (I) > Y (J); | |
8812 | -- end if; | |
8813 | ||
8814 | Loop_Body := | |
8815 | Make_Implicit_If_Statement (Nod, | |
8816 | Condition => | |
8817 | Make_Op_Eq (Loc, | |
8818 | Left_Opnd => | |
8819 | Make_Indexed_Component (Loc, | |
8820 | Prefix => New_Reference_To (X, Loc), | |
8821 | Expressions => New_List (New_Reference_To (I, Loc))), | |
8822 | ||
8823 | Right_Opnd => | |
8824 | Make_Indexed_Component (Loc, | |
8825 | Prefix => New_Reference_To (Y, Loc), | |
8826 | Expressions => New_List (New_Reference_To (J, Loc)))), | |
8827 | ||
8828 | Then_Statements => New_List (Inner_If), | |
8829 | ||
8830 | Else_Statements => New_List ( | |
d766cee3 | 8831 | Make_Simple_Return_Statement (Loc, |
70482933 RK |
8832 | Expression => |
8833 | Make_Op_Gt (Loc, | |
8834 | Left_Opnd => | |
8835 | Make_Indexed_Component (Loc, | |
8836 | Prefix => New_Reference_To (X, Loc), | |
8837 | Expressions => New_List (New_Reference_To (I, Loc))), | |
8838 | ||
8839 | Right_Opnd => | |
8840 | Make_Indexed_Component (Loc, | |
8841 | Prefix => New_Reference_To (Y, Loc), | |
8842 | Expressions => New_List ( | |
8843 | New_Reference_To (J, Loc))))))); | |
8844 | ||
8845 | -- for I in X'range loop | |
8846 | -- if ... end if; | |
8847 | -- end loop; | |
8848 | ||
8849 | Loop_Statement := | |
8850 | Make_Implicit_Loop_Statement (Nod, | |
8851 | Identifier => Empty, | |
8852 | ||
8853 | Iteration_Scheme => | |
8854 | Make_Iteration_Scheme (Loc, | |
8855 | Loop_Parameter_Specification => | |
8856 | Make_Loop_Parameter_Specification (Loc, | |
8857 | Defining_Identifier => I, | |
8858 | Discrete_Subtype_Definition => | |
8859 | Make_Attribute_Reference (Loc, | |
8860 | Prefix => New_Reference_To (X, Loc), | |
8861 | Attribute_Name => Name_Range))), | |
8862 | ||
8863 | Statements => New_List (Loop_Body)); | |
8864 | ||
8865 | -- if X'length = 0 then | |
8866 | -- return false; | |
8867 | -- elsif Y'length = 0 then | |
8868 | -- return true; | |
8869 | -- else | |
8870 | -- for ... loop ... end loop; | |
8871 | -- return X'length > Y'length; | |
8872 | -- end if; | |
8873 | ||
8874 | Length1 := | |
8875 | Make_Attribute_Reference (Loc, | |
8876 | Prefix => New_Reference_To (X, Loc), | |
8877 | Attribute_Name => Name_Length); | |
8878 | ||
8879 | Length2 := | |
8880 | Make_Attribute_Reference (Loc, | |
8881 | Prefix => New_Reference_To (Y, Loc), | |
8882 | Attribute_Name => Name_Length); | |
8883 | ||
8884 | Final_Expr := | |
8885 | Make_Op_Gt (Loc, | |
8886 | Left_Opnd => Length1, | |
8887 | Right_Opnd => Length2); | |
8888 | ||
8889 | If_Stat := | |
8890 | Make_Implicit_If_Statement (Nod, | |
8891 | Condition => | |
8892 | Make_Op_Eq (Loc, | |
8893 | Left_Opnd => | |
8894 | Make_Attribute_Reference (Loc, | |
8895 | Prefix => New_Reference_To (X, Loc), | |
8896 | Attribute_Name => Name_Length), | |
8897 | Right_Opnd => | |
8898 | Make_Integer_Literal (Loc, 0)), | |
8899 | ||
8900 | Then_Statements => | |
8901 | New_List ( | |
d766cee3 | 8902 | Make_Simple_Return_Statement (Loc, |
70482933 RK |
8903 | Expression => New_Reference_To (Standard_False, Loc))), |
8904 | ||
8905 | Elsif_Parts => New_List ( | |
8906 | Make_Elsif_Part (Loc, | |
8907 | Condition => | |
8908 | Make_Op_Eq (Loc, | |
8909 | Left_Opnd => | |
8910 | Make_Attribute_Reference (Loc, | |
8911 | Prefix => New_Reference_To (Y, Loc), | |
8912 | Attribute_Name => Name_Length), | |
8913 | Right_Opnd => | |
8914 | Make_Integer_Literal (Loc, 0)), | |
8915 | ||
8916 | Then_Statements => | |
8917 | New_List ( | |
d766cee3 | 8918 | Make_Simple_Return_Statement (Loc, |
70482933 RK |
8919 | Expression => New_Reference_To (Standard_True, Loc))))), |
8920 | ||
8921 | Else_Statements => New_List ( | |
8922 | Loop_Statement, | |
d766cee3 | 8923 | Make_Simple_Return_Statement (Loc, |
70482933 RK |
8924 | Expression => Final_Expr))); |
8925 | ||
8926 | -- (X : a; Y: a) | |
8927 | ||
8928 | Formals := New_List ( | |
8929 | Make_Parameter_Specification (Loc, | |
8930 | Defining_Identifier => X, | |
8931 | Parameter_Type => New_Reference_To (Typ, Loc)), | |
8932 | ||
8933 | Make_Parameter_Specification (Loc, | |
8934 | Defining_Identifier => Y, | |
8935 | Parameter_Type => New_Reference_To (Typ, Loc))); | |
8936 | ||
8937 | -- function Gnnn (...) return boolean is | |
8938 | -- J : index := Y'first; | |
8939 | -- begin | |
8940 | -- if ... end if; | |
8941 | -- end Gnnn; | |
8942 | ||
8943 | Func_Name := Make_Defining_Identifier (Loc, New_Internal_Name ('G')); | |
8944 | ||
8945 | Func_Body := | |
8946 | Make_Subprogram_Body (Loc, | |
8947 | Specification => | |
8948 | Make_Function_Specification (Loc, | |
8949 | Defining_Unit_Name => Func_Name, | |
8950 | Parameter_Specifications => Formals, | |
630d30e9 | 8951 | Result_Definition => New_Reference_To (Standard_Boolean, Loc)), |
70482933 RK |
8952 | |
8953 | Declarations => New_List ( | |
8954 | Make_Object_Declaration (Loc, | |
8955 | Defining_Identifier => J, | |
8956 | Object_Definition => New_Reference_To (Index, Loc), | |
8957 | Expression => | |
8958 | Make_Attribute_Reference (Loc, | |
8959 | Prefix => New_Reference_To (Y, Loc), | |
8960 | Attribute_Name => Name_First))), | |
8961 | ||
8962 | Handled_Statement_Sequence => | |
8963 | Make_Handled_Sequence_Of_Statements (Loc, | |
8964 | Statements => New_List (If_Stat))); | |
8965 | ||
8966 | return Func_Body; | |
70482933 RK |
8967 | end Make_Array_Comparison_Op; |
8968 | ||
8969 | --------------------------- | |
8970 | -- Make_Boolean_Array_Op -- | |
8971 | --------------------------- | |
8972 | ||
685094bf RD |
8973 | -- For logical operations on boolean arrays, expand in line the following, |
8974 | -- replacing 'and' with 'or' or 'xor' where needed: | |
70482933 RK |
8975 | |
8976 | -- function Annn (A : typ; B: typ) return typ is | |
8977 | -- C : typ; | |
8978 | -- begin | |
8979 | -- for J in A'range loop | |
8980 | -- C (J) := A (J) op B (J); | |
8981 | -- end loop; | |
8982 | -- return C; | |
8983 | -- end Annn; | |
8984 | ||
8985 | -- Here typ is the boolean array type | |
8986 | ||
8987 | function Make_Boolean_Array_Op | |
2e071734 AC |
8988 | (Typ : Entity_Id; |
8989 | N : Node_Id) return Node_Id | |
70482933 RK |
8990 | is |
8991 | Loc : constant Source_Ptr := Sloc (N); | |
8992 | ||
8993 | A : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uA); | |
8994 | B : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uB); | |
8995 | C : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uC); | |
8996 | J : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uJ); | |
8997 | ||
8998 | A_J : Node_Id; | |
8999 | B_J : Node_Id; | |
9000 | C_J : Node_Id; | |
9001 | Op : Node_Id; | |
9002 | ||
9003 | Formals : List_Id; | |
9004 | Func_Name : Entity_Id; | |
9005 | Func_Body : Node_Id; | |
9006 | Loop_Statement : Node_Id; | |
9007 | ||
9008 | begin | |
9009 | A_J := | |
9010 | Make_Indexed_Component (Loc, | |
9011 | Prefix => New_Reference_To (A, Loc), | |
9012 | Expressions => New_List (New_Reference_To (J, Loc))); | |
9013 | ||
9014 | B_J := | |
9015 | Make_Indexed_Component (Loc, | |
9016 | Prefix => New_Reference_To (B, Loc), | |
9017 | Expressions => New_List (New_Reference_To (J, Loc))); | |
9018 | ||
9019 | C_J := | |
9020 | Make_Indexed_Component (Loc, | |
9021 | Prefix => New_Reference_To (C, Loc), | |
9022 | Expressions => New_List (New_Reference_To (J, Loc))); | |
9023 | ||
9024 | if Nkind (N) = N_Op_And then | |
9025 | Op := | |
9026 | Make_Op_And (Loc, | |
9027 | Left_Opnd => A_J, | |
9028 | Right_Opnd => B_J); | |
9029 | ||
9030 | elsif Nkind (N) = N_Op_Or then | |
9031 | Op := | |
9032 | Make_Op_Or (Loc, | |
9033 | Left_Opnd => A_J, | |
9034 | Right_Opnd => B_J); | |
9035 | ||
9036 | else | |
9037 | Op := | |
9038 | Make_Op_Xor (Loc, | |
9039 | Left_Opnd => A_J, | |
9040 | Right_Opnd => B_J); | |
9041 | end if; | |
9042 | ||
9043 | Loop_Statement := | |
9044 | Make_Implicit_Loop_Statement (N, | |
9045 | Identifier => Empty, | |
9046 | ||
9047 | Iteration_Scheme => | |
9048 | Make_Iteration_Scheme (Loc, | |
9049 | Loop_Parameter_Specification => | |
9050 | Make_Loop_Parameter_Specification (Loc, | |
9051 | Defining_Identifier => J, | |
9052 | Discrete_Subtype_Definition => | |
9053 | Make_Attribute_Reference (Loc, | |
9054 | Prefix => New_Reference_To (A, Loc), | |
9055 | Attribute_Name => Name_Range))), | |
9056 | ||
9057 | Statements => New_List ( | |
9058 | Make_Assignment_Statement (Loc, | |
9059 | Name => C_J, | |
9060 | Expression => Op))); | |
9061 | ||
9062 | Formals := New_List ( | |
9063 | Make_Parameter_Specification (Loc, | |
9064 | Defining_Identifier => A, | |
9065 | Parameter_Type => New_Reference_To (Typ, Loc)), | |
9066 | ||
9067 | Make_Parameter_Specification (Loc, | |
9068 | Defining_Identifier => B, | |
9069 | Parameter_Type => New_Reference_To (Typ, Loc))); | |
9070 | ||
9071 | Func_Name := | |
9072 | Make_Defining_Identifier (Loc, New_Internal_Name ('A')); | |
9073 | Set_Is_Inlined (Func_Name); | |
9074 | ||
9075 | Func_Body := | |
9076 | Make_Subprogram_Body (Loc, | |
9077 | Specification => | |
9078 | Make_Function_Specification (Loc, | |
9079 | Defining_Unit_Name => Func_Name, | |
9080 | Parameter_Specifications => Formals, | |
630d30e9 | 9081 | Result_Definition => New_Reference_To (Typ, Loc)), |
70482933 RK |
9082 | |
9083 | Declarations => New_List ( | |
9084 | Make_Object_Declaration (Loc, | |
9085 | Defining_Identifier => C, | |
9086 | Object_Definition => New_Reference_To (Typ, Loc))), | |
9087 | ||
9088 | Handled_Statement_Sequence => | |
9089 | Make_Handled_Sequence_Of_Statements (Loc, | |
9090 | Statements => New_List ( | |
9091 | Loop_Statement, | |
d766cee3 | 9092 | Make_Simple_Return_Statement (Loc, |
70482933 RK |
9093 | Expression => New_Reference_To (C, Loc))))); |
9094 | ||
9095 | return Func_Body; | |
9096 | end Make_Boolean_Array_Op; | |
9097 | ||
9098 | ------------------------ | |
9099 | -- Rewrite_Comparison -- | |
9100 | ------------------------ | |
9101 | ||
9102 | procedure Rewrite_Comparison (N : Node_Id) is | |
c800f862 RD |
9103 | Warning_Generated : Boolean := False; |
9104 | -- Set to True if first pass with Assume_Valid generates a warning in | |
9105 | -- which case we skip the second pass to avoid warning overloaded. | |
9106 | ||
9107 | Result : Node_Id; | |
9108 | -- Set to Standard_True or Standard_False | |
9109 | ||
d26dc4b5 AC |
9110 | begin |
9111 | if Nkind (N) = N_Type_Conversion then | |
9112 | Rewrite_Comparison (Expression (N)); | |
20b5d666 | 9113 | return; |
70482933 | 9114 | |
d26dc4b5 | 9115 | elsif Nkind (N) not in N_Op_Compare then |
20b5d666 JM |
9116 | return; |
9117 | end if; | |
70482933 | 9118 | |
c800f862 RD |
9119 | -- Now start looking at the comparison in detail. We potentially go |
9120 | -- through this loop twice. The first time, Assume_Valid is set False | |
9121 | -- in the call to Compile_Time_Compare. If this call results in a | |
9122 | -- clear result of always True or Always False, that's decisive and | |
9123 | -- we are done. Otherwise we repeat the processing with Assume_Valid | |
9124 | -- set to True to generate additional warnings. We can stil that step | |
9125 | -- if Constant_Condition_Warnings is False. | |
9126 | ||
9127 | for AV in False .. True loop | |
9128 | declare | |
9129 | Typ : constant Entity_Id := Etype (N); | |
9130 | Op1 : constant Node_Id := Left_Opnd (N); | |
9131 | Op2 : constant Node_Id := Right_Opnd (N); | |
70482933 | 9132 | |
c800f862 RD |
9133 | Res : constant Compare_Result := |
9134 | Compile_Time_Compare (Op1, Op2, Assume_Valid => AV); | |
9135 | -- Res indicates if compare outcome can be compile time determined | |
f02b8bb8 | 9136 | |
c800f862 RD |
9137 | True_Result : Boolean; |
9138 | False_Result : Boolean; | |
f02b8bb8 | 9139 | |
c800f862 RD |
9140 | begin |
9141 | case N_Op_Compare (Nkind (N)) is | |
d26dc4b5 AC |
9142 | when N_Op_Eq => |
9143 | True_Result := Res = EQ; | |
9144 | False_Result := Res = LT or else Res = GT or else Res = NE; | |
9145 | ||
9146 | when N_Op_Ge => | |
9147 | True_Result := Res in Compare_GE; | |
9148 | False_Result := Res = LT; | |
9149 | ||
9150 | if Res = LE | |
9151 | and then Constant_Condition_Warnings | |
9152 | and then Comes_From_Source (Original_Node (N)) | |
9153 | and then Nkind (Original_Node (N)) = N_Op_Ge | |
9154 | and then not In_Instance | |
d26dc4b5 | 9155 | and then Is_Integer_Type (Etype (Left_Opnd (N))) |
59ae6391 | 9156 | and then not Has_Warnings_Off (Etype (Left_Opnd (N))) |
d26dc4b5 AC |
9157 | then |
9158 | Error_Msg_N | |
9159 | ("can never be greater than, could replace by ""'=""?", N); | |
c800f862 | 9160 | Warning_Generated := True; |
d26dc4b5 | 9161 | end if; |
70482933 | 9162 | |
d26dc4b5 AC |
9163 | when N_Op_Gt => |
9164 | True_Result := Res = GT; | |
9165 | False_Result := Res in Compare_LE; | |
9166 | ||
9167 | when N_Op_Lt => | |
9168 | True_Result := Res = LT; | |
9169 | False_Result := Res in Compare_GE; | |
9170 | ||
9171 | when N_Op_Le => | |
9172 | True_Result := Res in Compare_LE; | |
9173 | False_Result := Res = GT; | |
9174 | ||
9175 | if Res = GE | |
9176 | and then Constant_Condition_Warnings | |
9177 | and then Comes_From_Source (Original_Node (N)) | |
9178 | and then Nkind (Original_Node (N)) = N_Op_Le | |
9179 | and then not In_Instance | |
d26dc4b5 | 9180 | and then Is_Integer_Type (Etype (Left_Opnd (N))) |
59ae6391 | 9181 | and then not Has_Warnings_Off (Etype (Left_Opnd (N))) |
d26dc4b5 AC |
9182 | then |
9183 | Error_Msg_N | |
9184 | ("can never be less than, could replace by ""'=""?", N); | |
c800f862 | 9185 | Warning_Generated := True; |
d26dc4b5 | 9186 | end if; |
70482933 | 9187 | |
d26dc4b5 AC |
9188 | when N_Op_Ne => |
9189 | True_Result := Res = NE or else Res = GT or else Res = LT; | |
9190 | False_Result := Res = EQ; | |
c800f862 | 9191 | end case; |
d26dc4b5 | 9192 | |
c800f862 RD |
9193 | -- If this is the first iteration, then we actually convert the |
9194 | -- comparison into True or False, if the result is certain. | |
d26dc4b5 | 9195 | |
c800f862 RD |
9196 | if AV = False then |
9197 | if True_Result or False_Result then | |
9198 | if True_Result then | |
9199 | Result := Standard_True; | |
9200 | else | |
9201 | Result := Standard_False; | |
9202 | end if; | |
9203 | ||
9204 | Rewrite (N, | |
9205 | Convert_To (Typ, | |
9206 | New_Occurrence_Of (Result, Sloc (N)))); | |
9207 | Analyze_And_Resolve (N, Typ); | |
9208 | Warn_On_Known_Condition (N); | |
9209 | return; | |
9210 | end if; | |
9211 | ||
9212 | -- If this is the second iteration (AV = True), and the original | |
9213 | -- node comes from source and we are not in an instance, then | |
9214 | -- give a warning if we know result would be True or False. Note | |
9215 | -- we know Constant_Condition_Warnings is set if we get here. | |
9216 | ||
9217 | elsif Comes_From_Source (Original_Node (N)) | |
9218 | and then not In_Instance | |
9219 | then | |
9220 | if True_Result then | |
9221 | Error_Msg_N | |
9222 | ("condition can only be False if invalid values present?", | |
9223 | N); | |
9224 | elsif False_Result then | |
9225 | Error_Msg_N | |
9226 | ("condition can only be True if invalid values present?", | |
9227 | N); | |
9228 | end if; | |
9229 | end if; | |
9230 | end; | |
9231 | ||
9232 | -- Skip second iteration if not warning on constant conditions or | |
9233 | -- if the first iteration already generated a warning of some kind | |
9234 | -- or if we are in any case assuming all values are valid (so that | |
9235 | -- the first iteration took care of the valid case). | |
9236 | ||
9237 | exit when not Constant_Condition_Warnings; | |
9238 | exit when Warning_Generated; | |
9239 | exit when Assume_No_Invalid_Values; | |
9240 | end loop; | |
70482933 RK |
9241 | end Rewrite_Comparison; |
9242 | ||
fbf5a39b AC |
9243 | ---------------------------- |
9244 | -- Safe_In_Place_Array_Op -- | |
9245 | ---------------------------- | |
9246 | ||
9247 | function Safe_In_Place_Array_Op | |
2e071734 AC |
9248 | (Lhs : Node_Id; |
9249 | Op1 : Node_Id; | |
9250 | Op2 : Node_Id) return Boolean | |
fbf5a39b AC |
9251 | is |
9252 | Target : Entity_Id; | |
9253 | ||
9254 | function Is_Safe_Operand (Op : Node_Id) return Boolean; | |
9255 | -- Operand is safe if it cannot overlap part of the target of the | |
9256 | -- operation. If the operand and the target are identical, the operand | |
9257 | -- is safe. The operand can be empty in the case of negation. | |
9258 | ||
9259 | function Is_Unaliased (N : Node_Id) return Boolean; | |
5e1c00fa | 9260 | -- Check that N is a stand-alone entity |
fbf5a39b AC |
9261 | |
9262 | ------------------ | |
9263 | -- Is_Unaliased -- | |
9264 | ------------------ | |
9265 | ||
9266 | function Is_Unaliased (N : Node_Id) return Boolean is | |
9267 | begin | |
9268 | return | |
9269 | Is_Entity_Name (N) | |
9270 | and then No (Address_Clause (Entity (N))) | |
9271 | and then No (Renamed_Object (Entity (N))); | |
9272 | end Is_Unaliased; | |
9273 | ||
9274 | --------------------- | |
9275 | -- Is_Safe_Operand -- | |
9276 | --------------------- | |
9277 | ||
9278 | function Is_Safe_Operand (Op : Node_Id) return Boolean is | |
9279 | begin | |
9280 | if No (Op) then | |
9281 | return True; | |
9282 | ||
9283 | elsif Is_Entity_Name (Op) then | |
9284 | return Is_Unaliased (Op); | |
9285 | ||
303b4d58 | 9286 | elsif Nkind_In (Op, N_Indexed_Component, N_Selected_Component) then |
fbf5a39b AC |
9287 | return Is_Unaliased (Prefix (Op)); |
9288 | ||
9289 | elsif Nkind (Op) = N_Slice then | |
9290 | return | |
9291 | Is_Unaliased (Prefix (Op)) | |
9292 | and then Entity (Prefix (Op)) /= Target; | |
9293 | ||
9294 | elsif Nkind (Op) = N_Op_Not then | |
9295 | return Is_Safe_Operand (Right_Opnd (Op)); | |
9296 | ||
9297 | else | |
9298 | return False; | |
9299 | end if; | |
9300 | end Is_Safe_Operand; | |
9301 | ||
9302 | -- Start of processing for Is_Safe_In_Place_Array_Op | |
9303 | ||
9304 | begin | |
685094bf RD |
9305 | -- Skip this processing if the component size is different from system |
9306 | -- storage unit (since at least for NOT this would cause problems). | |
fbf5a39b AC |
9307 | |
9308 | if Component_Size (Etype (Lhs)) /= System_Storage_Unit then | |
9309 | return False; | |
9310 | ||
26bff3d9 | 9311 | -- Cannot do in place stuff on VM_Target since cannot pass addresses |
fbf5a39b | 9312 | |
26bff3d9 | 9313 | elsif VM_Target /= No_VM then |
fbf5a39b AC |
9314 | return False; |
9315 | ||
9316 | -- Cannot do in place stuff if non-standard Boolean representation | |
9317 | ||
9318 | elsif Has_Non_Standard_Rep (Component_Type (Etype (Lhs))) then | |
9319 | return False; | |
9320 | ||
9321 | elsif not Is_Unaliased (Lhs) then | |
9322 | return False; | |
9323 | else | |
9324 | Target := Entity (Lhs); | |
9325 | ||
9326 | return | |
9327 | Is_Safe_Operand (Op1) | |
9328 | and then Is_Safe_Operand (Op2); | |
9329 | end if; | |
9330 | end Safe_In_Place_Array_Op; | |
9331 | ||
70482933 RK |
9332 | ----------------------- |
9333 | -- Tagged_Membership -- | |
9334 | ----------------------- | |
9335 | ||
685094bf RD |
9336 | -- There are two different cases to consider depending on whether the right |
9337 | -- operand is a class-wide type or not. If not we just compare the actual | |
9338 | -- tag of the left expr to the target type tag: | |
70482933 RK |
9339 | -- |
9340 | -- Left_Expr.Tag = Right_Type'Tag; | |
9341 | -- | |
685094bf RD |
9342 | -- If it is a class-wide type we use the RT function CW_Membership which is |
9343 | -- usually implemented by looking in the ancestor tables contained in the | |
9344 | -- dispatch table pointed by Left_Expr.Tag for Typ'Tag | |
70482933 | 9345 | |
0669bebe GB |
9346 | -- Ada 2005 (AI-251): If it is a class-wide interface type we use the RT |
9347 | -- function IW_Membership which is usually implemented by looking in the | |
9348 | -- table of abstract interface types plus the ancestor table contained in | |
9349 | -- the dispatch table pointed by Left_Expr.Tag for Typ'Tag | |
9350 | ||
70482933 RK |
9351 | function Tagged_Membership (N : Node_Id) return Node_Id is |
9352 | Left : constant Node_Id := Left_Opnd (N); | |
9353 | Right : constant Node_Id := Right_Opnd (N); | |
9354 | Loc : constant Source_Ptr := Sloc (N); | |
9355 | ||
9356 | Left_Type : Entity_Id; | |
9357 | Right_Type : Entity_Id; | |
9358 | Obj_Tag : Node_Id; | |
9359 | ||
9360 | begin | |
9361 | Left_Type := Etype (Left); | |
9362 | Right_Type := Etype (Right); | |
9363 | ||
9364 | if Is_Class_Wide_Type (Left_Type) then | |
9365 | Left_Type := Root_Type (Left_Type); | |
9366 | end if; | |
9367 | ||
9368 | Obj_Tag := | |
9369 | Make_Selected_Component (Loc, | |
9370 | Prefix => Relocate_Node (Left), | |
a9d8907c JM |
9371 | Selector_Name => |
9372 | New_Reference_To (First_Tag_Component (Left_Type), Loc)); | |
70482933 RK |
9373 | |
9374 | if Is_Class_Wide_Type (Right_Type) then | |
758c442c | 9375 | |
0669bebe GB |
9376 | -- No need to issue a run-time check if we statically know that the |
9377 | -- result of this membership test is always true. For example, | |
9378 | -- considering the following declarations: | |
9379 | ||
9380 | -- type Iface is interface; | |
9381 | -- type T is tagged null record; | |
9382 | -- type DT is new T and Iface with null record; | |
9383 | ||
9384 | -- Obj1 : T; | |
9385 | -- Obj2 : DT; | |
9386 | ||
9387 | -- These membership tests are always true: | |
9388 | ||
9389 | -- Obj1 in T'Class | |
9390 | -- Obj2 in T'Class; | |
9391 | -- Obj2 in Iface'Class; | |
9392 | ||
9393 | -- We do not need to handle cases where the membership is illegal. | |
9394 | -- For example: | |
9395 | ||
9396 | -- Obj1 in DT'Class; -- Compile time error | |
9397 | -- Obj1 in Iface'Class; -- Compile time error | |
9398 | ||
9399 | if not Is_Class_Wide_Type (Left_Type) | |
ce2b6ba5 | 9400 | and then (Is_Ancestor (Etype (Right_Type), Left_Type) |
0669bebe GB |
9401 | or else (Is_Interface (Etype (Right_Type)) |
9402 | and then Interface_Present_In_Ancestor | |
9403 | (Typ => Left_Type, | |
9404 | Iface => Etype (Right_Type)))) | |
9405 | then | |
9406 | return New_Reference_To (Standard_True, Loc); | |
9407 | end if; | |
9408 | ||
758c442c GD |
9409 | -- Ada 2005 (AI-251): Class-wide applied to interfaces |
9410 | ||
630d30e9 RD |
9411 | if Is_Interface (Etype (Class_Wide_Type (Right_Type))) |
9412 | ||
0669bebe | 9413 | -- Support to: "Iface_CW_Typ in Typ'Class" |
630d30e9 RD |
9414 | |
9415 | or else Is_Interface (Left_Type) | |
9416 | then | |
dfd99a80 TQ |
9417 | -- Issue error if IW_Membership operation not available in a |
9418 | -- configurable run time setting. | |
9419 | ||
9420 | if not RTE_Available (RE_IW_Membership) then | |
b4592168 GD |
9421 | Error_Msg_CRT |
9422 | ("dynamic membership test on interface types", N); | |
dfd99a80 TQ |
9423 | return Empty; |
9424 | end if; | |
9425 | ||
758c442c GD |
9426 | return |
9427 | Make_Function_Call (Loc, | |
9428 | Name => New_Occurrence_Of (RTE (RE_IW_Membership), Loc), | |
9429 | Parameter_Associations => New_List ( | |
9430 | Make_Attribute_Reference (Loc, | |
9431 | Prefix => Obj_Tag, | |
9432 | Attribute_Name => Name_Address), | |
9433 | New_Reference_To ( | |
9434 | Node (First_Elmt | |
9435 | (Access_Disp_Table (Root_Type (Right_Type)))), | |
9436 | Loc))); | |
9437 | ||
9438 | -- Ada 95: Normal case | |
9439 | ||
9440 | else | |
9441 | return | |
0669bebe GB |
9442 | Build_CW_Membership (Loc, |
9443 | Obj_Tag_Node => Obj_Tag, | |
9444 | Typ_Tag_Node => | |
758c442c GD |
9445 | New_Reference_To ( |
9446 | Node (First_Elmt | |
9447 | (Access_Disp_Table (Root_Type (Right_Type)))), | |
0669bebe | 9448 | Loc)); |
758c442c GD |
9449 | end if; |
9450 | ||
0669bebe GB |
9451 | -- Right_Type is not a class-wide type |
9452 | ||
70482933 | 9453 | else |
0669bebe GB |
9454 | -- No need to check the tag of the object if Right_Typ is abstract |
9455 | ||
9456 | if Is_Abstract_Type (Right_Type) then | |
9457 | return New_Reference_To (Standard_False, Loc); | |
9458 | ||
9459 | else | |
9460 | return | |
9461 | Make_Op_Eq (Loc, | |
9462 | Left_Opnd => Obj_Tag, | |
9463 | Right_Opnd => | |
9464 | New_Reference_To | |
9465 | (Node (First_Elmt (Access_Disp_Table (Right_Type))), Loc)); | |
9466 | end if; | |
70482933 | 9467 | end if; |
70482933 RK |
9468 | end Tagged_Membership; |
9469 | ||
9470 | ------------------------------ | |
9471 | -- Unary_Op_Validity_Checks -- | |
9472 | ------------------------------ | |
9473 | ||
9474 | procedure Unary_Op_Validity_Checks (N : Node_Id) is | |
9475 | begin | |
9476 | if Validity_Checks_On and Validity_Check_Operands then | |
9477 | Ensure_Valid (Right_Opnd (N)); | |
9478 | end if; | |
9479 | end Unary_Op_Validity_Checks; | |
9480 | ||
9481 | end Exp_Ch4; |