Mercurial > projects > ldc
annotate dmd/optimize.c @ 888:d8c44f1e08e1
Fix #164.
| author | Christian Kamm <kamm incasoftware de> |
|---|---|
| date | Sat, 17 Jan 2009 17:41:03 +0100 |
| parents | 330f999ade44 |
| children | e74e2e53ba3b |
| rev | line source |
|---|---|
| 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()); |
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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 { | |
| 888 | 368 e1 = e1->syntaxCopy(); |
| 336 | 369 e1->type = type; |
| 370 return e1; | |
| 371 } | |
| 372 | |
| 373 if (result & WANTflags && type->ty == Tclass && e1->type->ty == Tclass) | |
| 374 { | |
| 375 // See if we can remove an unnecessary cast | |
| 376 ClassDeclaration *cdfrom; | |
| 377 ClassDeclaration *cdto; | |
| 378 int offset; | |
| 379 | |
| 380 cdfrom = e1->type->isClassHandle(); | |
| 381 cdto = type->isClassHandle(); | |
| 382 if (cdto->isBaseOf(cdfrom, &offset) && offset == 0) | |
| 383 { | |
| 888 | 384 e1 = e1->syntaxCopy(); |
| 336 | 385 e1->type = type; |
| 386 return e1; | |
| 387 } | |
| 388 } | |
| 389 | |
| 390 Expression *e; | |
| 391 | |
| 392 if (e1->isConst()) | |
| 393 { | |
| 394 if (e1->op == TOKsymoff) | |
| 395 { | |
| 396 if (type->size() == e1->type->size() && | |
| 397 type->toBasetype()->ty != Tsarray) | |
| 398 { | |
| 888 | 399 e1 = e1->syntaxCopy(); |
| 336 | 400 e1->type = type; |
| 401 return e1; | |
| 402 } | |
| 403 return this; | |
| 404 } | |
| 405 if (to->toBasetype()->ty == Tvoid) | |
| 406 e = this; | |
| 407 else | |
| 408 e = Cast(type, to, e1); | |
| 409 } | |
| 410 else | |
| 411 e = this; | |
| 412 return e; | |
| 413 } | |
| 414 | |
| 415 Expression *BinExp::optimize(int result) | |
| 416 { | |
| 417 //printf("BinExp::optimize(result = %d) %s\n", result, toChars()); | |
| 418 e1 = e1->optimize(result); | |
| 419 e2 = e2->optimize(result); | |
| 420 if (op == TOKshlass || op == TOKshrass || op == TOKushrass) | |
| 421 { | |
| 422 if (e2->isConst() == 1) | |
| 423 { | |
| 424 integer_t i2 = e2->toInteger(); | |
| 425 d_uns64 sz = e1->type->size() * 8; | |
| 426 if (i2 < 0 || i2 > sz) | |
| 427 { | |
| 428 error("shift assign by %lld is outside the range 0..%"PRIuSIZE, i2, sz); | |
| 429 e2 = new IntegerExp(0); | |
| 430 } | |
| 431 } | |
| 432 } | |
| 433 return this; | |
| 434 } | |
| 435 | |
| 436 Expression *AddExp::optimize(int result) | |
| 437 { Expression *e; | |
| 438 | |
| 439 //printf("AddExp::optimize(%s)\n", toChars()); | |
| 440 e1 = e1->optimize(result); | |
| 441 e2 = e2->optimize(result); | |
| 442 if (e1->isConst() && e2->isConst()) | |
| 443 { | |
| 444 if (e1->op == TOKsymoff && e2->op == TOKsymoff) | |
| 445 return this; | |
| 446 e = Add(type, e1, e2); | |
| 447 } | |
| 448 else | |
| 449 e = this; | |
| 450 return e; | |
| 451 } | |
| 452 | |
| 453 Expression *MinExp::optimize(int result) | |
| 454 { Expression *e; | |
| 455 | |
| 456 e1 = e1->optimize(result); | |
| 457 e2 = e2->optimize(result); | |
| 458 if (e1->isConst() && e2->isConst()) | |
| 459 { | |
| 460 if (e2->op == TOKsymoff) | |
| 461 return this; | |
| 462 e = Min(type, e1, e2); | |
| 463 } | |
| 464 else | |
| 465 e = this; | |
| 466 return e; | |
| 467 } | |
| 468 | |
| 469 Expression *MulExp::optimize(int result) | |
| 470 { Expression *e; | |
| 471 | |
| 472 //printf("MulExp::optimize(result = %d) %s\n", result, toChars()); | |
| 473 e1 = e1->optimize(result); | |
| 474 e2 = e2->optimize(result); | |
| 475 if (e1->isConst() == 1 && e2->isConst() == 1) | |
| 476 { | |
| 477 e = Mul(type, e1, e2); | |
| 478 } | |
| 479 else | |
| 480 e = this; | |
| 481 return e; | |
| 482 } | |
| 483 | |
| 484 Expression *DivExp::optimize(int result) | |
| 485 { Expression *e; | |
| 486 | |
| 487 //printf("DivExp::optimize(%s)\n", toChars()); | |
| 488 e1 = e1->optimize(result); | |
| 489 e2 = e2->optimize(result); | |
| 490 if (e1->isConst() == 1 && e2->isConst() == 1) | |
| 491 { | |
| 492 e = Div(type, e1, e2); | |
| 493 } | |
| 494 else | |
| 495 e = this; | |
| 496 return e; | |
| 497 } | |
| 498 | |
| 499 Expression *ModExp::optimize(int result) | |
| 500 { Expression *e; | |
| 501 | |
| 502 e1 = e1->optimize(result); | |
| 503 e2 = e2->optimize(result); | |
| 504 if (e1->isConst() == 1 && e2->isConst() == 1) | |
| 505 { | |
| 506 e = Mod(type, e1, e2); | |
| 507 } | |
| 508 else | |
| 509 e = this; | |
| 510 return e; | |
| 511 } | |
| 512 | |
| 513 Expression *shift_optimize(int result, BinExp *e, Expression *(*shift)(Type *, Expression *, Expression *)) | |
| 514 { Expression *ex = e; | |
| 515 | |
| 516 e->e1 = e->e1->optimize(result); | |
| 517 e->e2 = e->e2->optimize(result); | |
| 518 if (e->e2->isConst() == 1) | |
| 519 { | |
| 520 integer_t i2 = e->e2->toInteger(); | |
| 521 d_uns64 sz = e->e1->type->size() * 8; | |
| 522 if (i2 < 0 || i2 > sz) | |
| 523 { | |
| 524 error("shift by %lld is outside the range 0..%"PRIuSIZE, i2, sz); | |
| 525 e->e2 = new IntegerExp(0); | |
| 526 } | |
| 527 if (e->e1->isConst() == 1) | |
| 528 ex = (*shift)(e->type, e->e1, e->e2); | |
| 529 } | |
| 530 return ex; | |
| 531 } | |
| 532 | |
| 533 Expression *ShlExp::optimize(int result) | |
| 534 { | |
| 535 //printf("ShlExp::optimize(result = %d) %s\n", result, toChars()); | |
| 536 return shift_optimize(result, this, Shl); | |
| 537 } | |
| 538 | |
| 539 Expression *ShrExp::optimize(int result) | |
| 540 { | |
| 541 //printf("ShrExp::optimize(result = %d) %s\n", result, toChars()); | |
| 542 return shift_optimize(result, this, Shr); | |
| 543 } | |
| 544 | |
| 545 Expression *UshrExp::optimize(int result) | |
| 546 { | |
| 547 //printf("UshrExp::optimize(result = %d) %s\n", result, toChars()); | |
| 548 return shift_optimize(result, this, Ushr); | |
| 549 } | |
| 550 | |
| 551 Expression *AndExp::optimize(int result) | |
| 552 { Expression *e; | |
| 553 | |
| 554 e1 = e1->optimize(result); | |
| 555 e2 = e2->optimize(result); | |
| 556 if (e1->isConst() == 1 && e2->isConst() == 1) | |
| 557 e = And(type, e1, e2); | |
| 558 else | |
| 559 e = this; | |
| 560 return e; | |
| 561 } | |
| 562 | |
| 563 Expression *OrExp::optimize(int result) | |
| 564 { Expression *e; | |
| 565 | |
| 566 e1 = e1->optimize(result); | |
| 567 e2 = e2->optimize(result); | |
| 568 if (e1->isConst() == 1 && e2->isConst() == 1) | |
| 569 e = Or(type, e1, e2); | |
| 570 else | |
| 571 e = this; | |
| 572 return e; | |
| 573 } | |
| 574 | |
| 575 Expression *XorExp::optimize(int result) | |
| 576 { Expression *e; | |
| 577 | |
| 578 e1 = e1->optimize(result); | |
| 579 e2 = e2->optimize(result); | |
| 580 if (e1->isConst() == 1 && e2->isConst() == 1) | |
| 581 e = Xor(type, e1, e2); | |
| 582 else | |
| 583 e = this; | |
| 584 return e; | |
| 585 } | |
| 586 | |
| 587 Expression *CommaExp::optimize(int result) | |
| 588 { Expression *e; | |
| 589 | |
| 590 //printf("CommaExp::optimize(result = %d) %s\n", result, toChars()); | |
| 591 e1 = e1->optimize(result & WANTinterpret); | |
| 592 e2 = e2->optimize(result); | |
| 593 if (!e1 || e1->op == TOKint64 || e1->op == TOKfloat64 || !e1->checkSideEffect(2)) | |
| 594 { | |
| 595 e = e2; | |
| 596 if (e) | |
| 597 e->type = type; | |
| 598 } | |
| 599 else | |
| 600 e = this; | |
| 601 //printf("-CommaExp::optimize(result = %d) %s\n", result, e->toChars()); | |
| 602 return e; | |
| 603 } | |
| 604 | |
| 605 Expression *ArrayLengthExp::optimize(int result) | |
| 606 { Expression *e; | |
| 607 | |
| 608 //printf("ArrayLengthExp::optimize(result = %d) %s\n", result, toChars()); | |
| 609 e1 = e1->optimize(WANTvalue | (result & WANTinterpret)); | |
| 610 e = this; | |
| 611 if (e1->op == TOKstring || e1->op == TOKarrayliteral || e1->op == TOKassocarrayliteral) | |
| 612 { | |
| 613 e = ArrayLength(type, e1); | |
| 614 } | |
| 615 return e; | |
| 616 } | |
| 617 | |
| 618 Expression *EqualExp::optimize(int result) | |
| 619 { Expression *e; | |
| 620 | |
| 621 //printf("EqualExp::optimize(result = %x) %s\n", result, toChars()); | |
| 622 e1 = e1->optimize(WANTvalue | (result & WANTinterpret)); | |
| 623 e2 = e2->optimize(WANTvalue | (result & WANTinterpret)); | |
| 624 e = this; | |
| 625 | |
| 626 Expression *e1 = fromConstInitializer(this->e1); | |
| 627 Expression *e2 = fromConstInitializer(this->e2); | |
| 628 | |
| 629 e = Equal(op, type, e1, e2); | |
| 630 if (e == EXP_CANT_INTERPRET) | |
| 631 e = this; | |
| 632 return e; | |
| 633 } | |
| 634 | |
| 635 Expression *IdentityExp::optimize(int result) | |
| 636 { Expression *e; | |
| 637 | |
| 638 //printf("IdentityExp::optimize(result = %d) %s\n", result, toChars()); | |
| 639 e1 = e1->optimize(WANTvalue | (result & WANTinterpret)); | |
| 640 e2 = e2->optimize(WANTvalue | (result & WANTinterpret)); | |
| 641 e = this; | |
| 642 | |
| 643 if (this->e1->isConst() && this->e2->isConst()) | |
| 644 { | |
| 645 e = Identity(op, type, this->e1, this->e2); | |
| 646 } | |
| 647 return e; | |
| 648 } | |
| 649 | |
| 650 Expression *IndexExp::optimize(int result) | |
| 651 { Expression *e; | |
| 652 | |
| 653 //printf("IndexExp::optimize(result = %d) %s\n", result, toChars()); | |
| 654 Expression *e1 = this->e1->optimize(WANTvalue | (result & WANTinterpret)); | |
| 655 if (result & WANTinterpret) | |
| 656 e1 = fromConstInitializer(e1); | |
| 657 e2 = e2->optimize(WANTvalue | (result & WANTinterpret)); | |
| 658 e = Index(type, e1, e2); | |
| 659 if (e == EXP_CANT_INTERPRET) | |
| 660 e = this; | |
| 661 return e; | |
| 662 } | |
| 663 | |
| 664 Expression *SliceExp::optimize(int result) | |
| 665 { Expression *e; | |
| 666 | |
| 667 //printf("SliceExp::optimize(result = %d) %s\n", result, toChars()); | |
| 668 e = this; | |
| 669 e1 = e1->optimize(WANTvalue | (result & WANTinterpret)); | |
| 670 if (!lwr) | |
| 671 { if (e1->op == TOKstring) | |
| 672 { // Convert slice of string literal into dynamic array | |
| 673 Type *t = e1->type->toBasetype(); | |
| 674 if (t->next) | |
| 675 e = e1->castTo(NULL, t->next->arrayOf()); | |
| 676 } | |
| 677 return e; | |
| 678 } | |
| 679 if (result & WANTinterpret) | |
| 680 e1 = fromConstInitializer(e1); | |
| 681 lwr = lwr->optimize(WANTvalue | (result & WANTinterpret)); | |
| 682 upr = upr->optimize(WANTvalue | (result & WANTinterpret)); | |
| 683 e = Slice(type, e1, lwr, upr); | |
| 684 if (e == EXP_CANT_INTERPRET) | |
| 685 e = this; | |
| 686 return e; | |
| 687 } | |
| 688 | |
| 689 Expression *AndAndExp::optimize(int result) | |
| 690 { Expression *e; | |
| 691 | |
| 692 //printf("AndAndExp::optimize(%d) %s\n", result, toChars()); | |
| 693 e1 = e1->optimize(WANTflags | (result & WANTinterpret)); | |
| 694 e = this; | |
| 695 if (e1->isBool(FALSE)) | |
| 696 { | |
| 697 e = new CommaExp(loc, e1, new IntegerExp(loc, 0, type)); | |
| 698 e->type = type; | |
| 699 e = e->optimize(result); | |
| 700 } | |
| 701 else | |
| 702 { | |
| 703 e2 = e2->optimize(WANTflags | (result & WANTinterpret)); | |
| 704 if (result && e2->type->toBasetype()->ty == Tvoid && !global.errors) | |
| 705 error("void has no value"); | |
| 706 if (e1->isConst()) | |
| 707 { | |
| 708 if (e2->isConst()) | |
| 709 { int n1 = e1->isBool(1); | |
| 710 int n2 = e2->isBool(1); | |
| 711 | |
| 712 e = new IntegerExp(loc, n1 && n2, type); | |
| 713 } | |
| 714 else if (e1->isBool(TRUE)) | |
| 715 e = new BoolExp(loc, e2, type); | |
| 716 } | |
| 717 } | |
| 718 return e; | |
| 719 } | |
| 720 | |
| 721 Expression *OrOrExp::optimize(int result) | |
| 722 { Expression *e; | |
| 723 | |
| 724 e1 = e1->optimize(WANTflags | (result & WANTinterpret)); | |
| 725 e = this; | |
| 726 if (e1->isBool(TRUE)) | |
| 727 { // Replace with (e1, 1) | |
| 728 e = new CommaExp(loc, e1, new IntegerExp(loc, 1, type)); | |
| 729 e->type = type; | |
| 730 e = e->optimize(result); | |
| 731 } | |
| 732 else | |
| 733 { | |
| 734 e2 = e2->optimize(WANTflags | (result & WANTinterpret)); | |
| 735 if (result && e2->type->toBasetype()->ty == Tvoid && !global.errors) | |
| 736 error("void has no value"); | |
| 737 if (e1->isConst()) | |
| 738 { | |
| 739 if (e2->isConst()) | |
| 740 { int n1 = e1->isBool(1); | |
| 741 int n2 = e2->isBool(1); | |
| 742 | |
| 743 e = new IntegerExp(loc, n1 || n2, type); | |
| 744 } | |
| 745 else if (e1->isBool(FALSE)) | |
| 746 e = new BoolExp(loc, e2, type); | |
| 747 } | |
| 748 } | |
| 749 return e; | |
| 750 } | |
| 751 | |
| 752 Expression *CmpExp::optimize(int result) | |
| 753 { Expression *e; | |
| 754 | |
| 755 //printf("CmpExp::optimize() %s\n", toChars()); | |
| 756 e1 = e1->optimize(result); | |
| 757 e2 = e2->optimize(result); | |
| 758 if (e1->isConst() == 1 && e2->isConst() == 1) | |
| 759 { | |
| 760 e = Cmp(op, type, this->e1, this->e2); | |
| 761 } | |
| 762 else | |
| 763 e = this; | |
| 764 return e; | |
| 765 } | |
| 766 | |
| 767 Expression *CatExp::optimize(int result) | |
| 768 { Expression *e; | |
| 769 | |
| 770 //printf("CatExp::optimize(%d) %s\n", result, toChars()); | |
| 771 e1 = e1->optimize(result); | |
| 772 e2 = e2->optimize(result); | |
| 773 e = Cat(type, e1, e2); | |
| 774 if (e == EXP_CANT_INTERPRET) | |
| 775 e = this; | |
| 776 return e; | |
| 777 } | |
| 778 | |
| 779 | |
| 780 Expression *CondExp::optimize(int result) | |
| 781 { Expression *e; | |
| 782 | |
| 783 econd = econd->optimize(WANTflags | (result & WANTinterpret)); | |
| 784 if (econd->isBool(TRUE)) | |
| 785 e = e1->optimize(result); | |
| 786 else if (econd->isBool(FALSE)) | |
| 787 e = e2->optimize(result); | |
| 788 else | |
| 789 { e1 = e1->optimize(result); | |
| 790 e2 = e2->optimize(result); | |
| 791 e = this; | |
| 792 } | |
| 793 return e; | |
| 794 } | |
| 795 | |
| 796 |