Mercurial > projects > ldc
annotate dmd/optimize.c @ 973:d96471e8b5e5
Fix #216 by implementing TypeExp::toElem. It just provides the appropriate
error message.
author | Christian Kamm <kamm incasoftware de> |
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date | Tue, 17 Feb 2009 18:25:34 +0100 |
parents | e74e2e53ba3b |
children | c519caae3181 |
rev | line source |
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336 | 1 |
2 // Compiler implementation of the D programming language | |
3 // Copyright (c) 1999-2007 by Digital Mars | |
4 // All Rights Reserved | |
5 // written by Walter Bright | |
6 // http://www.digitalmars.com | |
7 // License for redistribution is by either the Artistic License | |
8 // in artistic.txt, or the GNU General Public License in gnu.txt. | |
9 // See the included readme.txt for details. | |
10 | |
11 #include <stdio.h> | |
12 #include <ctype.h> | |
13 #include <assert.h> | |
14 #include <math.h> | |
15 | |
16 #if __DMC__ | |
17 #include <complex.h> | |
18 #endif | |
19 | |
20 #include "lexer.h" | |
21 #include "mtype.h" | |
22 #include "expression.h" | |
23 #include "declaration.h" | |
24 #include "aggregate.h" | |
25 #include "init.h" | |
26 | |
27 | |
28 #ifdef IN_GCC | |
29 #include "d-gcc-real.h" | |
30 | |
31 /* %% fix? */ | |
32 extern "C" bool real_isnan (const real_t *); | |
33 #endif | |
34 | |
35 static real_t zero; // work around DMC bug for now | |
36 | |
37 | |
38 /************************************* | |
39 * If expression is a variable with a const initializer, | |
40 * return that initializer. | |
41 */ | |
42 | |
43 Expression *fromConstInitializer(Expression *e1) | |
44 { | |
45 //printf("fromConstInitializer(%s)\n", e1->toChars()); | |
46 if (e1->op == TOKvar) | |
47 { VarExp *ve = (VarExp *)e1; | |
48 VarDeclaration *v = ve->var->isVarDeclaration(); | |
49 if (v && v->isConst() && v->init) | |
50 { Expression *ei = v->init->toExpression(); | |
51 if (ei && ei->type) | |
52 e1 = ei; | |
53 } | |
54 } | |
55 return e1; | |
56 } | |
57 | |
58 | |
59 Expression *Expression::optimize(int result) | |
60 { | |
61 //printf("Expression::optimize(result = x%x) %s\n", result, toChars()); | |
62 return this; | |
63 } | |
64 | |
65 Expression *VarExp::optimize(int result) | |
66 { | |
67 if (result & WANTinterpret) | |
68 { | |
69 return fromConstInitializer(this); | |
70 } | |
71 return this; | |
72 } | |
73 | |
74 Expression *TupleExp::optimize(int result) | |
75 { | |
76 for (size_t i = 0; i < exps->dim; i++) | |
77 { Expression *e = (Expression *)exps->data[i]; | |
78 | |
79 e = e->optimize(WANTvalue | (result & WANTinterpret)); | |
80 exps->data[i] = (void *)e; | |
81 } | |
82 return this; | |
83 } | |
84 | |
85 Expression *ArrayLiteralExp::optimize(int result) | |
86 { | |
87 if (elements) | |
88 { | |
89 for (size_t i = 0; i < elements->dim; i++) | |
90 { Expression *e = (Expression *)elements->data[i]; | |
91 | |
92 e = e->optimize(WANTvalue | (result & WANTinterpret)); | |
93 elements->data[i] = (void *)e; | |
94 } | |
95 } | |
96 return this; | |
97 } | |
98 | |
99 Expression *AssocArrayLiteralExp::optimize(int result) | |
100 { | |
101 assert(keys->dim == values->dim); | |
102 for (size_t i = 0; i < keys->dim; i++) | |
103 { Expression *e = (Expression *)keys->data[i]; | |
104 | |
105 e = e->optimize(WANTvalue | (result & WANTinterpret)); | |
106 keys->data[i] = (void *)e; | |
107 | |
108 e = (Expression *)values->data[i]; | |
109 e = e->optimize(WANTvalue | (result & WANTinterpret)); | |
110 values->data[i] = (void *)e; | |
111 } | |
112 return this; | |
113 } | |
114 | |
115 Expression *StructLiteralExp::optimize(int result) | |
116 { | |
117 if (elements) | |
118 { | |
119 for (size_t i = 0; i < elements->dim; i++) | |
120 { Expression *e = (Expression *)elements->data[i]; | |
121 if (!e) | |
122 continue; | |
123 e = e->optimize(WANTvalue | (result & WANTinterpret)); | |
124 elements->data[i] = (void *)e; | |
125 } | |
126 } | |
127 return this; | |
128 } | |
129 | |
130 Expression *TypeExp::optimize(int result) | |
131 { | |
132 return this; | |
133 } | |
134 | |
135 Expression *UnaExp::optimize(int result) | |
136 { | |
137 e1 = e1->optimize(result); | |
138 return this; | |
139 } | |
140 | |
141 Expression *NegExp::optimize(int result) | |
142 { Expression *e; | |
143 | |
144 e1 = e1->optimize(result); | |
145 if (e1->isConst() == 1) | |
146 { | |
147 e = Neg(type, e1); | |
148 } | |
149 else | |
150 e = this; | |
151 return e; | |
152 } | |
153 | |
154 Expression *ComExp::optimize(int result) | |
155 { Expression *e; | |
156 | |
157 e1 = e1->optimize(result); | |
158 if (e1->isConst() == 1) | |
159 { | |
160 e = Com(type, e1); | |
161 } | |
162 else | |
163 e = this; | |
164 return e; | |
165 } | |
166 | |
167 Expression *NotExp::optimize(int result) | |
168 { Expression *e; | |
169 | |
170 e1 = e1->optimize(result); | |
171 if (e1->isConst() == 1) | |
172 { | |
173 e = Not(type, e1); | |
174 } | |
175 else | |
176 e = this; | |
177 return e; | |
178 } | |
179 | |
180 Expression *BoolExp::optimize(int result) | |
181 { Expression *e; | |
182 | |
183 e1 = e1->optimize(result); | |
184 if (e1->isConst() == 1) | |
185 { | |
186 e = Bool(type, e1); | |
187 } | |
188 else | |
189 e = this; | |
190 return e; | |
191 } | |
192 | |
193 Expression *AddrExp::optimize(int result) | |
194 { Expression *e; | |
195 | |
196 //printf("AddrExp::optimize(result = %d) %s\n", result, toChars()); | |
197 e1 = e1->optimize(result); | |
198 // Convert &*ex to ex | |
199 if (e1->op == TOKstar) | |
200 { Expression *ex; | |
201 | |
202 ex = ((PtrExp *)e1)->e1; | |
203 if (type->equals(ex->type)) | |
204 e = ex; | |
205 else | |
206 { | |
207 e = ex->copy(); | |
208 e->type = type; | |
209 } | |
210 return e; | |
211 } | |
212 #if !IN_LLVM | |
213 if (e1->op == TOKvar) | |
214 { VarExp *ve = (VarExp *)e1; | |
215 if (!ve->var->isOut() && !ve->var->isRef() && | |
216 !ve->var->isImportedSymbol()) | |
217 { | |
218 e = new SymOffExp(loc, ve->var, 0); | |
219 e->type = type; | |
220 return e; | |
221 } | |
222 } | |
223 if (e1->op == TOKindex) | |
224 { // Convert &array[n] to &array+n | |
225 IndexExp *ae = (IndexExp *)e1; | |
226 | |
227 if (ae->e2->op == TOKint64 && ae->e1->op == TOKvar) | |
228 { | |
229 integer_t index = ae->e2->toInteger(); | |
230 VarExp *ve = (VarExp *)ae->e1; | |
231 if (ve->type->ty == Tsarray && ve->type->next->ty != Tbit | |
232 && !ve->var->isImportedSymbol()) | |
233 { | |
234 TypeSArray *ts = (TypeSArray *)ve->type; | |
235 integer_t dim = ts->dim->toInteger(); | |
236 if (index < 0 || index >= dim) | |
237 error("array index %lld is out of bounds [0..%lld]", index, dim); | |
238 e = new SymOffExp(loc, ve->var, index * ts->next->size()); | |
239 e->type = type; | |
240 return e; | |
241 } | |
242 } | |
243 } | |
244 #endif | |
245 return this; | |
246 } | |
247 | |
248 Expression *PtrExp::optimize(int result) | |
249 { | |
250 //printf("PtrExp::optimize(result = x%x) %s\n", result, toChars()); | |
251 e1 = e1->optimize(result); | |
252 // Convert *&ex to ex | |
253 if (e1->op == TOKaddress) | |
254 { Expression *e; | |
255 Expression *ex; | |
256 | |
257 ex = ((AddrExp *)e1)->e1; | |
258 if (type->equals(ex->type)) | |
259 e = ex; | |
260 else | |
261 { | |
262 e = ex->copy(); | |
263 e->type = type; | |
264 } | |
265 return e; | |
266 } | |
267 // Constant fold *(&structliteral + offset) | |
268 if (e1->op == TOKadd) | |
269 { | |
270 Expression *e; | |
271 e = Ptr(type, e1); | |
272 if (e != EXP_CANT_INTERPRET) | |
273 return e; | |
274 } | |
275 | |
276 return this; | |
277 } | |
278 | |
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279 Expression *DotVarExp::optimize(int result) |
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280 { |
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281 //printf("DotVarExp::optimize(result = x%x) %s\n", result, toChars()); |
588
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282 e1 = e1->optimize(result); |
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283 |
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284 #if DMDV2 |
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285 if (e1->op == TOKvar) |
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286 { VarExp *ve = (VarExp *)e1; |
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287 VarDeclaration *v = ve->var->isVarDeclaration(); |
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288 Expression *e = expandVar(result, v); |
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289 if (e && e->op == TOKstructliteral) |
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290 { StructLiteralExp *sle = (StructLiteralExp *)e; |
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291 VarDeclaration *vf = var->isVarDeclaration(); |
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292 if (vf) |
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293 { |
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294 e = sle->getField(type, vf->offset); |
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295 if (e != EXP_CANT_INTERPRET) |
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296 return e; |
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297 } |
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298 } |
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299 } |
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300 else |
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301 #endif |
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302 if (e1->op == TOKstructliteral) |
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303 { StructLiteralExp *sle = (StructLiteralExp *)e1; |
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304 VarDeclaration *vf = var->isVarDeclaration(); |
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305 if (vf) |
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306 { |
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307 Expression *e = sle->getField(type, vf->offset); |
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308 if (e != EXP_CANT_INTERPRET) |
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309 return e; |
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310 } |
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311 } |
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312 |
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313 return this; |
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314 } |
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315 |
336 | 316 Expression *CallExp::optimize(int result) |
317 { Expression *e = this; | |
318 | |
319 e1 = e1->optimize(result); | |
320 if (e1->op == TOKvar && result & WANTinterpret) | |
321 { | |
322 FuncDeclaration *fd = ((VarExp *)e1)->var->isFuncDeclaration(); | |
323 if (fd) | |
324 { | |
325 Expression *eresult = fd->interpret(NULL, arguments); | |
326 if (eresult && eresult != EXP_VOID_INTERPRET) | |
327 e = eresult; | |
328 else if (result & WANTinterpret) | |
329 error("cannot evaluate %s at compile time", toChars()); | |
330 } | |
331 } | |
332 return e; | |
333 } | |
334 | |
335 | |
336 Expression *CastExp::optimize(int result) | |
337 { | |
338 //printf("CastExp::optimize(result = %d) %s\n", result, toChars()); | |
339 //printf("from %s to %s\n", type->toChars(), to->toChars()); | |
340 //printf("from %s\n", type->toChars()); | |
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341 //printf("e1->type %s\n", e1->type->toChars()); |
336 | 342 //printf("type = %p\n", type); |
343 assert(type); | |
344 enum TOK op1 = e1->op; | |
345 | |
346 e1 = e1->optimize(result); | |
347 if (result & WANTinterpret) | |
348 e1 = fromConstInitializer(e1); | |
349 | |
350 if ((e1->op == TOKstring || e1->op == TOKarrayliteral) && | |
351 (type->ty == Tpointer || type->ty == Tarray) && | |
352 type->next->equals(e1->type->next) | |
353 ) | |
354 { | |
888 | 355 // make a copy before adjusting type to avoid |
356 // messing up the type of an existing initializer | |
357 e1 = e1->syntaxCopy(); | |
336 | 358 e1->type = type; |
359 return e1; | |
360 } | |
361 /* The first test here is to prevent infinite loops | |
362 */ | |
363 if (op1 != TOKarrayliteral && e1->op == TOKarrayliteral) | |
364 return e1->castTo(NULL, to); | |
365 if (e1->op == TOKnull && | |
366 (type->ty == Tpointer || type->ty == Tclass)) | |
367 { | |
368 e1->type = type; | |
369 return e1; | |
370 } | |
371 | |
372 if (result & WANTflags && type->ty == Tclass && e1->type->ty == Tclass) | |
373 { | |
374 // See if we can remove an unnecessary cast | |
375 ClassDeclaration *cdfrom; | |
376 ClassDeclaration *cdto; | |
377 int offset; | |
378 | |
379 cdfrom = e1->type->isClassHandle(); | |
380 cdto = type->isClassHandle(); | |
381 if (cdto->isBaseOf(cdfrom, &offset) && offset == 0) | |
382 { | |
383 e1->type = type; | |
384 return e1; | |
385 } | |
386 } | |
387 | |
388 Expression *e; | |
389 | |
390 if (e1->isConst()) | |
391 { | |
392 if (e1->op == TOKsymoff) | |
393 { | |
394 if (type->size() == e1->type->size() && | |
395 type->toBasetype()->ty != Tsarray) | |
396 { | |
397 e1->type = type; | |
398 return e1; | |
399 } | |
400 return this; | |
401 } | |
402 if (to->toBasetype()->ty == Tvoid) | |
403 e = this; | |
404 else | |
405 e = Cast(type, to, e1); | |
406 } | |
407 else | |
408 e = this; | |
409 return e; | |
410 } | |
411 | |
412 Expression *BinExp::optimize(int result) | |
413 { | |
414 //printf("BinExp::optimize(result = %d) %s\n", result, toChars()); | |
415 e1 = e1->optimize(result); | |
416 e2 = e2->optimize(result); | |
417 if (op == TOKshlass || op == TOKshrass || op == TOKushrass) | |
418 { | |
419 if (e2->isConst() == 1) | |
420 { | |
421 integer_t i2 = e2->toInteger(); | |
422 d_uns64 sz = e1->type->size() * 8; | |
423 if (i2 < 0 || i2 > sz) | |
424 { | |
425 error("shift assign by %lld is outside the range 0..%"PRIuSIZE, i2, sz); | |
426 e2 = new IntegerExp(0); | |
427 } | |
428 } | |
429 } | |
430 return this; | |
431 } | |
432 | |
433 Expression *AddExp::optimize(int result) | |
434 { Expression *e; | |
435 | |
436 //printf("AddExp::optimize(%s)\n", toChars()); | |
437 e1 = e1->optimize(result); | |
438 e2 = e2->optimize(result); | |
439 if (e1->isConst() && e2->isConst()) | |
440 { | |
441 if (e1->op == TOKsymoff && e2->op == TOKsymoff) | |
442 return this; | |
443 e = Add(type, e1, e2); | |
444 } | |
445 else | |
446 e = this; | |
447 return e; | |
448 } | |
449 | |
450 Expression *MinExp::optimize(int result) | |
451 { Expression *e; | |
452 | |
453 e1 = e1->optimize(result); | |
454 e2 = e2->optimize(result); | |
455 if (e1->isConst() && e2->isConst()) | |
456 { | |
457 if (e2->op == TOKsymoff) | |
458 return this; | |
459 e = Min(type, e1, e2); | |
460 } | |
461 else | |
462 e = this; | |
463 return e; | |
464 } | |
465 | |
466 Expression *MulExp::optimize(int result) | |
467 { Expression *e; | |
468 | |
469 //printf("MulExp::optimize(result = %d) %s\n", result, toChars()); | |
470 e1 = e1->optimize(result); | |
471 e2 = e2->optimize(result); | |
472 if (e1->isConst() == 1 && e2->isConst() == 1) | |
473 { | |
474 e = Mul(type, e1, e2); | |
475 } | |
476 else | |
477 e = this; | |
478 return e; | |
479 } | |
480 | |
481 Expression *DivExp::optimize(int result) | |
482 { Expression *e; | |
483 | |
484 //printf("DivExp::optimize(%s)\n", toChars()); | |
485 e1 = e1->optimize(result); | |
486 e2 = e2->optimize(result); | |
487 if (e1->isConst() == 1 && e2->isConst() == 1) | |
488 { | |
489 e = Div(type, e1, e2); | |
490 } | |
491 else | |
492 e = this; | |
493 return e; | |
494 } | |
495 | |
496 Expression *ModExp::optimize(int result) | |
497 { Expression *e; | |
498 | |
499 e1 = e1->optimize(result); | |
500 e2 = e2->optimize(result); | |
501 if (e1->isConst() == 1 && e2->isConst() == 1) | |
502 { | |
503 e = Mod(type, e1, e2); | |
504 } | |
505 else | |
506 e = this; | |
507 return e; | |
508 } | |
509 | |
510 Expression *shift_optimize(int result, BinExp *e, Expression *(*shift)(Type *, Expression *, Expression *)) | |
511 { Expression *ex = e; | |
512 | |
513 e->e1 = e->e1->optimize(result); | |
514 e->e2 = e->e2->optimize(result); | |
515 if (e->e2->isConst() == 1) | |
516 { | |
517 integer_t i2 = e->e2->toInteger(); | |
518 d_uns64 sz = e->e1->type->size() * 8; | |
519 if (i2 < 0 || i2 > sz) | |
520 { | |
521 error("shift by %lld is outside the range 0..%"PRIuSIZE, i2, sz); | |
522 e->e2 = new IntegerExp(0); | |
523 } | |
524 if (e->e1->isConst() == 1) | |
525 ex = (*shift)(e->type, e->e1, e->e2); | |
526 } | |
527 return ex; | |
528 } | |
529 | |
530 Expression *ShlExp::optimize(int result) | |
531 { | |
532 //printf("ShlExp::optimize(result = %d) %s\n", result, toChars()); | |
533 return shift_optimize(result, this, Shl); | |
534 } | |
535 | |
536 Expression *ShrExp::optimize(int result) | |
537 { | |
538 //printf("ShrExp::optimize(result = %d) %s\n", result, toChars()); | |
539 return shift_optimize(result, this, Shr); | |
540 } | |
541 | |
542 Expression *UshrExp::optimize(int result) | |
543 { | |
544 //printf("UshrExp::optimize(result = %d) %s\n", result, toChars()); | |
545 return shift_optimize(result, this, Ushr); | |
546 } | |
547 | |
548 Expression *AndExp::optimize(int result) | |
549 { Expression *e; | |
550 | |
551 e1 = e1->optimize(result); | |
552 e2 = e2->optimize(result); | |
553 if (e1->isConst() == 1 && e2->isConst() == 1) | |
554 e = And(type, e1, e2); | |
555 else | |
556 e = this; | |
557 return e; | |
558 } | |
559 | |
560 Expression *OrExp::optimize(int result) | |
561 { Expression *e; | |
562 | |
563 e1 = e1->optimize(result); | |
564 e2 = e2->optimize(result); | |
565 if (e1->isConst() == 1 && e2->isConst() == 1) | |
566 e = Or(type, e1, e2); | |
567 else | |
568 e = this; | |
569 return e; | |
570 } | |
571 | |
572 Expression *XorExp::optimize(int result) | |
573 { Expression *e; | |
574 | |
575 e1 = e1->optimize(result); | |
576 e2 = e2->optimize(result); | |
577 if (e1->isConst() == 1 && e2->isConst() == 1) | |
578 e = Xor(type, e1, e2); | |
579 else | |
580 e = this; | |
581 return e; | |
582 } | |
583 | |
584 Expression *CommaExp::optimize(int result) | |
585 { Expression *e; | |
586 | |
587 //printf("CommaExp::optimize(result = %d) %s\n", result, toChars()); | |
588 e1 = e1->optimize(result & WANTinterpret); | |
589 e2 = e2->optimize(result); | |
590 if (!e1 || e1->op == TOKint64 || e1->op == TOKfloat64 || !e1->checkSideEffect(2)) | |
591 { | |
592 e = e2; | |
593 if (e) | |
594 e->type = type; | |
595 } | |
596 else | |
597 e = this; | |
598 //printf("-CommaExp::optimize(result = %d) %s\n", result, e->toChars()); | |
599 return e; | |
600 } | |
601 | |
602 Expression *ArrayLengthExp::optimize(int result) | |
603 { Expression *e; | |
604 | |
605 //printf("ArrayLengthExp::optimize(result = %d) %s\n", result, toChars()); | |
606 e1 = e1->optimize(WANTvalue | (result & WANTinterpret)); | |
607 e = this; | |
608 if (e1->op == TOKstring || e1->op == TOKarrayliteral || e1->op == TOKassocarrayliteral) | |
609 { | |
610 e = ArrayLength(type, e1); | |
611 } | |
612 return e; | |
613 } | |
614 | |
615 Expression *EqualExp::optimize(int result) | |
616 { Expression *e; | |
617 | |
618 //printf("EqualExp::optimize(result = %x) %s\n", result, toChars()); | |
619 e1 = e1->optimize(WANTvalue | (result & WANTinterpret)); | |
620 e2 = e2->optimize(WANTvalue | (result & WANTinterpret)); | |
621 e = this; | |
622 | |
623 Expression *e1 = fromConstInitializer(this->e1); | |
624 Expression *e2 = fromConstInitializer(this->e2); | |
625 | |
626 e = Equal(op, type, e1, e2); | |
627 if (e == EXP_CANT_INTERPRET) | |
628 e = this; | |
629 return e; | |
630 } | |
631 | |
632 Expression *IdentityExp::optimize(int result) | |
633 { Expression *e; | |
634 | |
635 //printf("IdentityExp::optimize(result = %d) %s\n", result, toChars()); | |
636 e1 = e1->optimize(WANTvalue | (result & WANTinterpret)); | |
637 e2 = e2->optimize(WANTvalue | (result & WANTinterpret)); | |
638 e = this; | |
639 | |
640 if (this->e1->isConst() && this->e2->isConst()) | |
641 { | |
642 e = Identity(op, type, this->e1, this->e2); | |
643 } | |
644 return e; | |
645 } | |
646 | |
647 Expression *IndexExp::optimize(int result) | |
648 { Expression *e; | |
649 | |
650 //printf("IndexExp::optimize(result = %d) %s\n", result, toChars()); | |
651 Expression *e1 = this->e1->optimize(WANTvalue | (result & WANTinterpret)); | |
652 if (result & WANTinterpret) | |
653 e1 = fromConstInitializer(e1); | |
654 e2 = e2->optimize(WANTvalue | (result & WANTinterpret)); | |
655 e = Index(type, e1, e2); | |
656 if (e == EXP_CANT_INTERPRET) | |
657 e = this; | |
658 return e; | |
659 } | |
660 | |
661 Expression *SliceExp::optimize(int result) | |
662 { Expression *e; | |
663 | |
664 //printf("SliceExp::optimize(result = %d) %s\n", result, toChars()); | |
665 e = this; | |
666 e1 = e1->optimize(WANTvalue | (result & WANTinterpret)); | |
667 if (!lwr) | |
668 { if (e1->op == TOKstring) | |
669 { // Convert slice of string literal into dynamic array | |
670 Type *t = e1->type->toBasetype(); | |
671 if (t->next) | |
672 e = e1->castTo(NULL, t->next->arrayOf()); | |
673 } | |
674 return e; | |
675 } | |
676 if (result & WANTinterpret) | |
677 e1 = fromConstInitializer(e1); | |
678 lwr = lwr->optimize(WANTvalue | (result & WANTinterpret)); | |
679 upr = upr->optimize(WANTvalue | (result & WANTinterpret)); | |
680 e = Slice(type, e1, lwr, upr); | |
681 if (e == EXP_CANT_INTERPRET) | |
682 e = this; | |
683 return e; | |
684 } | |
685 | |
686 Expression *AndAndExp::optimize(int result) | |
687 { Expression *e; | |
688 | |
689 //printf("AndAndExp::optimize(%d) %s\n", result, toChars()); | |
690 e1 = e1->optimize(WANTflags | (result & WANTinterpret)); | |
691 e = this; | |
692 if (e1->isBool(FALSE)) | |
693 { | |
694 e = new CommaExp(loc, e1, new IntegerExp(loc, 0, type)); | |
695 e->type = type; | |
696 e = e->optimize(result); | |
697 } | |
698 else | |
699 { | |
700 e2 = e2->optimize(WANTflags | (result & WANTinterpret)); | |
701 if (result && e2->type->toBasetype()->ty == Tvoid && !global.errors) | |
702 error("void has no value"); | |
703 if (e1->isConst()) | |
704 { | |
705 if (e2->isConst()) | |
706 { int n1 = e1->isBool(1); | |
707 int n2 = e2->isBool(1); | |
708 | |
709 e = new IntegerExp(loc, n1 && n2, type); | |
710 } | |
711 else if (e1->isBool(TRUE)) | |
712 e = new BoolExp(loc, e2, type); | |
713 } | |
714 } | |
715 return e; | |
716 } | |
717 | |
718 Expression *OrOrExp::optimize(int result) | |
719 { Expression *e; | |
720 | |
721 e1 = e1->optimize(WANTflags | (result & WANTinterpret)); | |
722 e = this; | |
723 if (e1->isBool(TRUE)) | |
724 { // Replace with (e1, 1) | |
725 e = new CommaExp(loc, e1, new IntegerExp(loc, 1, type)); | |
726 e->type = type; | |
727 e = e->optimize(result); | |
728 } | |
729 else | |
730 { | |
731 e2 = e2->optimize(WANTflags | (result & WANTinterpret)); | |
732 if (result && e2->type->toBasetype()->ty == Tvoid && !global.errors) | |
733 error("void has no value"); | |
734 if (e1->isConst()) | |
735 { | |
736 if (e2->isConst()) | |
737 { int n1 = e1->isBool(1); | |
738 int n2 = e2->isBool(1); | |
739 | |
740 e = new IntegerExp(loc, n1 || n2, type); | |
741 } | |
742 else if (e1->isBool(FALSE)) | |
743 e = new BoolExp(loc, e2, type); | |
744 } | |
745 } | |
746 return e; | |
747 } | |
748 | |
749 Expression *CmpExp::optimize(int result) | |
750 { Expression *e; | |
751 | |
752 //printf("CmpExp::optimize() %s\n", toChars()); | |
753 e1 = e1->optimize(result); | |
754 e2 = e2->optimize(result); | |
755 if (e1->isConst() == 1 && e2->isConst() == 1) | |
756 { | |
757 e = Cmp(op, type, this->e1, this->e2); | |
758 } | |
759 else | |
760 e = this; | |
761 return e; | |
762 } | |
763 | |
764 Expression *CatExp::optimize(int result) | |
765 { Expression *e; | |
766 | |
767 //printf("CatExp::optimize(%d) %s\n", result, toChars()); | |
768 e1 = e1->optimize(result); | |
769 e2 = e2->optimize(result); | |
770 e = Cat(type, e1, e2); | |
771 if (e == EXP_CANT_INTERPRET) | |
772 e = this; | |
773 return e; | |
774 } | |
775 | |
776 | |
777 Expression *CondExp::optimize(int result) | |
778 { Expression *e; | |
779 | |
780 econd = econd->optimize(WANTflags | (result & WANTinterpret)); | |
781 if (econd->isBool(TRUE)) | |
782 e = e1->optimize(result); | |
783 else if (econd->isBool(FALSE)) | |
784 e = e2->optimize(result); | |
785 else | |
786 { e1 = e1->optimize(result); | |
787 e2 = e2->optimize(result); | |
788 e = this; | |
789 } | |
790 return e; | |
791 } | |
792 | |
793 |