1 //===-- Execution.cpp - Implement code to simulate the program ------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file contains the actual instruction interpreter. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #define DEBUG_TYPE "interpreter" 15 #include "Interpreter.h" 16 #include "llvm/ADT/APInt.h" 17 #include "llvm/ADT/Statistic.h" 18 #include "llvm/CodeGen/IntrinsicLowering.h" 19 #include "llvm/IR/Constants.h" 20 #include "llvm/IR/DerivedTypes.h" 21 #include "llvm/IR/Instructions.h" 22 #include "llvm/Support/CommandLine.h" 23 #include "llvm/Support/Debug.h" 24 #include "llvm/Support/ErrorHandling.h" 25 #include "llvm/Support/GetElementPtrTypeIterator.h" 26 #include "llvm/Support/MathExtras.h" 27 #include <algorithm> 28 #include <cmath> 29 using namespace llvm; 30 31 STATISTIC(NumDynamicInsts, "Number of dynamic instructions executed"); 32 33 static cl::opt<bool> PrintVolatile("interpreter-print-volatile", cl::Hidden, 34 cl::desc("make the interpreter print every volatile load and store")); 35 36 //===----------------------------------------------------------------------===// 37 // Various Helper Functions 38 //===----------------------------------------------------------------------===// 39 40 static void SetValue(Value *V, GenericValue Val, ExecutionContext &SF) { 41 SF.Values[V] = Val; 42 } 43 44 //===----------------------------------------------------------------------===// 45 // Binary Instruction Implementations 46 //===----------------------------------------------------------------------===// 47 48 #define IMPLEMENT_BINARY_OPERATOR(OP, TY) \ 49 case Type::TY##TyID: \ 50 Dest.TY##Val = Src1.TY##Val OP Src2.TY##Val; \ 51 break 52 53 static void executeFAddInst(GenericValue &Dest, GenericValue Src1, 54 GenericValue Src2, Type *Ty) { 55 switch (Ty->getTypeID()) { 56 IMPLEMENT_BINARY_OPERATOR(+, Float); 57 IMPLEMENT_BINARY_OPERATOR(+, Double); 58 default: 59 dbgs() << "Unhandled type for FAdd instruction: " << *Ty << "\n"; 60 llvm_unreachable(0); 61 } 62 } 63 64 static void executeFSubInst(GenericValue &Dest, GenericValue Src1, 65 GenericValue Src2, Type *Ty) { 66 switch (Ty->getTypeID()) { 67 IMPLEMENT_BINARY_OPERATOR(-, Float); 68 IMPLEMENT_BINARY_OPERATOR(-, Double); 69 default: 70 dbgs() << "Unhandled type for FSub instruction: " << *Ty << "\n"; 71 llvm_unreachable(0); 72 } 73 } 74 75 static void executeFMulInst(GenericValue &Dest, GenericValue Src1, 76 GenericValue Src2, Type *Ty) { 77 switch (Ty->getTypeID()) { 78 IMPLEMENT_BINARY_OPERATOR(*, Float); 79 IMPLEMENT_BINARY_OPERATOR(*, Double); 80 default: 81 dbgs() << "Unhandled type for FMul instruction: " << *Ty << "\n"; 82 llvm_unreachable(0); 83 } 84 } 85 86 static void executeFDivInst(GenericValue &Dest, GenericValue Src1, 87 GenericValue Src2, Type *Ty) { 88 switch (Ty->getTypeID()) { 89 IMPLEMENT_BINARY_OPERATOR(/, Float); 90 IMPLEMENT_BINARY_OPERATOR(/, Double); 91 default: 92 dbgs() << "Unhandled type for FDiv instruction: " << *Ty << "\n"; 93 llvm_unreachable(0); 94 } 95 } 96 97 static void executeFRemInst(GenericValue &Dest, GenericValue Src1, 98 GenericValue Src2, Type *Ty) { 99 switch (Ty->getTypeID()) { 100 case Type::FloatTyID: 101 Dest.FloatVal = fmod(Src1.FloatVal, Src2.FloatVal); 102 break; 103 case Type::DoubleTyID: 104 Dest.DoubleVal = fmod(Src1.DoubleVal, Src2.DoubleVal); 105 break; 106 default: 107 dbgs() << "Unhandled type for Rem instruction: " << *Ty << "\n"; 108 llvm_unreachable(0); 109 } 110 } 111 112 #define IMPLEMENT_INTEGER_ICMP(OP, TY) \ 113 case Type::IntegerTyID: \ 114 Dest.IntVal = APInt(1,Src1.IntVal.OP(Src2.IntVal)); \ 115 break; 116 117 #define IMPLEMENT_VECTOR_INTEGER_ICMP(OP, TY) \ 118 case Type::VectorTyID: { \ 119 assert(Src1.AggregateVal.size() == Src2.AggregateVal.size()); \ 120 Dest.AggregateVal.resize( Src1.AggregateVal.size() ); \ 121 for( uint32_t _i=0;_i<Src1.AggregateVal.size();_i++) \ 122 Dest.AggregateVal[_i].IntVal = APInt(1, \ 123 Src1.AggregateVal[_i].IntVal.OP(Src2.AggregateVal[_i].IntVal));\ 124 } break; 125 126 // Handle pointers specially because they must be compared with only as much 127 // width as the host has. We _do not_ want to be comparing 64 bit values when 128 // running on a 32-bit target, otherwise the upper 32 bits might mess up 129 // comparisons if they contain garbage. 130 #define IMPLEMENT_POINTER_ICMP(OP) \ 131 case Type::PointerTyID: \ 132 Dest.IntVal = APInt(1,(void*)(intptr_t)Src1.PointerVal OP \ 133 (void*)(intptr_t)Src2.PointerVal); \ 134 break; 135 136 static GenericValue executeICMP_EQ(GenericValue Src1, GenericValue Src2, 137 Type *Ty) { 138 GenericValue Dest; 139 switch (Ty->getTypeID()) { 140 IMPLEMENT_INTEGER_ICMP(eq,Ty); 141 IMPLEMENT_VECTOR_INTEGER_ICMP(eq,Ty); 142 IMPLEMENT_POINTER_ICMP(==); 143 default: 144 dbgs() << "Unhandled type for ICMP_EQ predicate: " << *Ty << "\n"; 145 llvm_unreachable(0); 146 } 147 return Dest; 148 } 149 150 static GenericValue executeICMP_NE(GenericValue Src1, GenericValue Src2, 151 Type *Ty) { 152 GenericValue Dest; 153 switch (Ty->getTypeID()) { 154 IMPLEMENT_INTEGER_ICMP(ne,Ty); 155 IMPLEMENT_VECTOR_INTEGER_ICMP(ne,Ty); 156 IMPLEMENT_POINTER_ICMP(!=); 157 default: 158 dbgs() << "Unhandled type for ICMP_NE predicate: " << *Ty << "\n"; 159 llvm_unreachable(0); 160 } 161 return Dest; 162 } 163 164 static GenericValue executeICMP_ULT(GenericValue Src1, GenericValue Src2, 165 Type *Ty) { 166 GenericValue Dest; 167 switch (Ty->getTypeID()) { 168 IMPLEMENT_INTEGER_ICMP(ult,Ty); 169 IMPLEMENT_VECTOR_INTEGER_ICMP(ult,Ty); 170 IMPLEMENT_POINTER_ICMP(<); 171 default: 172 dbgs() << "Unhandled type for ICMP_ULT predicate: " << *Ty << "\n"; 173 llvm_unreachable(0); 174 } 175 return Dest; 176 } 177 178 static GenericValue executeICMP_SLT(GenericValue Src1, GenericValue Src2, 179 Type *Ty) { 180 GenericValue Dest; 181 switch (Ty->getTypeID()) { 182 IMPLEMENT_INTEGER_ICMP(slt,Ty); 183 IMPLEMENT_VECTOR_INTEGER_ICMP(slt,Ty); 184 IMPLEMENT_POINTER_ICMP(<); 185 default: 186 dbgs() << "Unhandled type for ICMP_SLT predicate: " << *Ty << "\n"; 187 llvm_unreachable(0); 188 } 189 return Dest; 190 } 191 192 static GenericValue executeICMP_UGT(GenericValue Src1, GenericValue Src2, 193 Type *Ty) { 194 GenericValue Dest; 195 switch (Ty->getTypeID()) { 196 IMPLEMENT_INTEGER_ICMP(ugt,Ty); 197 IMPLEMENT_VECTOR_INTEGER_ICMP(ugt,Ty); 198 IMPLEMENT_POINTER_ICMP(>); 199 default: 200 dbgs() << "Unhandled type for ICMP_UGT predicate: " << *Ty << "\n"; 201 llvm_unreachable(0); 202 } 203 return Dest; 204 } 205 206 static GenericValue executeICMP_SGT(GenericValue Src1, GenericValue Src2, 207 Type *Ty) { 208 GenericValue Dest; 209 switch (Ty->getTypeID()) { 210 IMPLEMENT_INTEGER_ICMP(sgt,Ty); 211 IMPLEMENT_VECTOR_INTEGER_ICMP(sgt,Ty); 212 IMPLEMENT_POINTER_ICMP(>); 213 default: 214 dbgs() << "Unhandled type for ICMP_SGT predicate: " << *Ty << "\n"; 215 llvm_unreachable(0); 216 } 217 return Dest; 218 } 219 220 static GenericValue executeICMP_ULE(GenericValue Src1, GenericValue Src2, 221 Type *Ty) { 222 GenericValue Dest; 223 switch (Ty->getTypeID()) { 224 IMPLEMENT_INTEGER_ICMP(ule,Ty); 225 IMPLEMENT_VECTOR_INTEGER_ICMP(ule,Ty); 226 IMPLEMENT_POINTER_ICMP(<=); 227 default: 228 dbgs() << "Unhandled type for ICMP_ULE predicate: " << *Ty << "\n"; 229 llvm_unreachable(0); 230 } 231 return Dest; 232 } 233 234 static GenericValue executeICMP_SLE(GenericValue Src1, GenericValue Src2, 235 Type *Ty) { 236 GenericValue Dest; 237 switch (Ty->getTypeID()) { 238 IMPLEMENT_INTEGER_ICMP(sle,Ty); 239 IMPLEMENT_VECTOR_INTEGER_ICMP(sle,Ty); 240 IMPLEMENT_POINTER_ICMP(<=); 241 default: 242 dbgs() << "Unhandled type for ICMP_SLE predicate: " << *Ty << "\n"; 243 llvm_unreachable(0); 244 } 245 return Dest; 246 } 247 248 static GenericValue executeICMP_UGE(GenericValue Src1, GenericValue Src2, 249 Type *Ty) { 250 GenericValue Dest; 251 switch (Ty->getTypeID()) { 252 IMPLEMENT_INTEGER_ICMP(uge,Ty); 253 IMPLEMENT_VECTOR_INTEGER_ICMP(uge,Ty); 254 IMPLEMENT_POINTER_ICMP(>=); 255 default: 256 dbgs() << "Unhandled type for ICMP_UGE predicate: " << *Ty << "\n"; 257 llvm_unreachable(0); 258 } 259 return Dest; 260 } 261 262 static GenericValue executeICMP_SGE(GenericValue Src1, GenericValue Src2, 263 Type *Ty) { 264 GenericValue Dest; 265 switch (Ty->getTypeID()) { 266 IMPLEMENT_INTEGER_ICMP(sge,Ty); 267 IMPLEMENT_VECTOR_INTEGER_ICMP(sge,Ty); 268 IMPLEMENT_POINTER_ICMP(>=); 269 default: 270 dbgs() << "Unhandled type for ICMP_SGE predicate: " << *Ty << "\n"; 271 llvm_unreachable(0); 272 } 273 return Dest; 274 } 275 276 void Interpreter::visitICmpInst(ICmpInst &I) { 277 ExecutionContext &SF = ECStack.back(); 278 Type *Ty = I.getOperand(0)->getType(); 279 GenericValue Src1 = getOperandValue(I.getOperand(0), SF); 280 GenericValue Src2 = getOperandValue(I.getOperand(1), SF); 281 GenericValue R; // Result 282 283 switch (I.getPredicate()) { 284 case ICmpInst::ICMP_EQ: R = executeICMP_EQ(Src1, Src2, Ty); break; 285 case ICmpInst::ICMP_NE: R = executeICMP_NE(Src1, Src2, Ty); break; 286 case ICmpInst::ICMP_ULT: R = executeICMP_ULT(Src1, Src2, Ty); break; 287 case ICmpInst::ICMP_SLT: R = executeICMP_SLT(Src1, Src2, Ty); break; 288 case ICmpInst::ICMP_UGT: R = executeICMP_UGT(Src1, Src2, Ty); break; 289 case ICmpInst::ICMP_SGT: R = executeICMP_SGT(Src1, Src2, Ty); break; 290 case ICmpInst::ICMP_ULE: R = executeICMP_ULE(Src1, Src2, Ty); break; 291 case ICmpInst::ICMP_SLE: R = executeICMP_SLE(Src1, Src2, Ty); break; 292 case ICmpInst::ICMP_UGE: R = executeICMP_UGE(Src1, Src2, Ty); break; 293 case ICmpInst::ICMP_SGE: R = executeICMP_SGE(Src1, Src2, Ty); break; 294 default: 295 dbgs() << "Don't know how to handle this ICmp predicate!\n-->" << I; 296 llvm_unreachable(0); 297 } 298 299 SetValue(&I, R, SF); 300 } 301 302 #define IMPLEMENT_FCMP(OP, TY) \ 303 case Type::TY##TyID: \ 304 Dest.IntVal = APInt(1,Src1.TY##Val OP Src2.TY##Val); \ 305 break 306 307 #define IMPLEMENT_VECTOR_FCMP_T(OP, TY) \ 308 assert(Src1.AggregateVal.size() == Src2.AggregateVal.size()); \ 309 Dest.AggregateVal.resize( Src1.AggregateVal.size() ); \ 310 for( uint32_t _i=0;_i<Src1.AggregateVal.size();_i++) \ 311 Dest.AggregateVal[_i].IntVal = APInt(1, \ 312 Src1.AggregateVal[_i].TY##Val OP Src2.AggregateVal[_i].TY##Val);\ 313 break; 314 315 #define IMPLEMENT_VECTOR_FCMP(OP) \ 316 case Type::VectorTyID: \ 317 if(dyn_cast<VectorType>(Ty)->getElementType()->isFloatTy()) { \ 318 IMPLEMENT_VECTOR_FCMP_T(OP, Float); \ 319 } else { \ 320 IMPLEMENT_VECTOR_FCMP_T(OP, Double); \ 321 } 322 323 static GenericValue executeFCMP_OEQ(GenericValue Src1, GenericValue Src2, 324 Type *Ty) { 325 GenericValue Dest; 326 switch (Ty->getTypeID()) { 327 IMPLEMENT_FCMP(==, Float); 328 IMPLEMENT_FCMP(==, Double); 329 IMPLEMENT_VECTOR_FCMP(==); 330 default: 331 dbgs() << "Unhandled type for FCmp EQ instruction: " << *Ty << "\n"; 332 llvm_unreachable(0); 333 } 334 return Dest; 335 } 336 337 #define IMPLEMENT_SCALAR_NANS(TY, X,Y) \ 338 if (TY->isFloatTy()) { \ 339 if (X.FloatVal != X.FloatVal || Y.FloatVal != Y.FloatVal) { \ 340 Dest.IntVal = APInt(1,false); \ 341 return Dest; \ 342 } \ 343 } else { \ 344 if (X.DoubleVal != X.DoubleVal || Y.DoubleVal != Y.DoubleVal) { \ 345 Dest.IntVal = APInt(1,false); \ 346 return Dest; \ 347 } \ 348 } 349 350 #define MASK_VECTOR_NANS_T(X,Y, TZ, FLAG) \ 351 assert(X.AggregateVal.size() == Y.AggregateVal.size()); \ 352 Dest.AggregateVal.resize( X.AggregateVal.size() ); \ 353 for( uint32_t _i=0;_i<X.AggregateVal.size();_i++) { \ 354 if (X.AggregateVal[_i].TZ##Val != X.AggregateVal[_i].TZ##Val || \ 355 Y.AggregateVal[_i].TZ##Val != Y.AggregateVal[_i].TZ##Val) \ 356 Dest.AggregateVal[_i].IntVal = APInt(1,FLAG); \ 357 else { \ 358 Dest.AggregateVal[_i].IntVal = APInt(1,!FLAG); \ 359 } \ 360 } 361 362 #define MASK_VECTOR_NANS(TY, X,Y, FLAG) \ 363 if (TY->isVectorTy()) { \ 364 if (dyn_cast<VectorType>(TY)->getElementType()->isFloatTy()) { \ 365 MASK_VECTOR_NANS_T(X, Y, Float, FLAG) \ 366 } else { \ 367 MASK_VECTOR_NANS_T(X, Y, Double, FLAG) \ 368 } \ 369 } \ 370 371 372 373 static GenericValue executeFCMP_ONE(GenericValue Src1, GenericValue Src2, 374 Type *Ty) 375 { 376 GenericValue Dest; 377 // if input is scalar value and Src1 or Src2 is NaN return false 378 IMPLEMENT_SCALAR_NANS(Ty, Src1, Src2) 379 // if vector input detect NaNs and fill mask 380 MASK_VECTOR_NANS(Ty, Src1, Src2, false) 381 GenericValue DestMask = Dest; 382 switch (Ty->getTypeID()) { 383 IMPLEMENT_FCMP(!=, Float); 384 IMPLEMENT_FCMP(!=, Double); 385 IMPLEMENT_VECTOR_FCMP(!=); 386 default: 387 dbgs() << "Unhandled type for FCmp NE instruction: " << *Ty << "\n"; 388 llvm_unreachable(0); 389 } 390 // in vector case mask out NaN elements 391 if (Ty->isVectorTy()) 392 for( size_t _i=0; _i<Src1.AggregateVal.size(); _i++) 393 if (DestMask.AggregateVal[_i].IntVal == false) 394 Dest.AggregateVal[_i].IntVal = APInt(1,false); 395 396 return Dest; 397 } 398 399 static GenericValue executeFCMP_OLE(GenericValue Src1, GenericValue Src2, 400 Type *Ty) { 401 GenericValue Dest; 402 switch (Ty->getTypeID()) { 403 IMPLEMENT_FCMP(<=, Float); 404 IMPLEMENT_FCMP(<=, Double); 405 IMPLEMENT_VECTOR_FCMP(<=); 406 default: 407 dbgs() << "Unhandled type for FCmp LE instruction: " << *Ty << "\n"; 408 llvm_unreachable(0); 409 } 410 return Dest; 411 } 412 413 static GenericValue executeFCMP_OGE(GenericValue Src1, GenericValue Src2, 414 Type *Ty) { 415 GenericValue Dest; 416 switch (Ty->getTypeID()) { 417 IMPLEMENT_FCMP(>=, Float); 418 IMPLEMENT_FCMP(>=, Double); 419 IMPLEMENT_VECTOR_FCMP(>=); 420 default: 421 dbgs() << "Unhandled type for FCmp GE instruction: " << *Ty << "\n"; 422 llvm_unreachable(0); 423 } 424 return Dest; 425 } 426 427 static GenericValue executeFCMP_OLT(GenericValue Src1, GenericValue Src2, 428 Type *Ty) { 429 GenericValue Dest; 430 switch (Ty->getTypeID()) { 431 IMPLEMENT_FCMP(<, Float); 432 IMPLEMENT_FCMP(<, Double); 433 IMPLEMENT_VECTOR_FCMP(<); 434 default: 435 dbgs() << "Unhandled type for FCmp LT instruction: " << *Ty << "\n"; 436 llvm_unreachable(0); 437 } 438 return Dest; 439 } 440 441 static GenericValue executeFCMP_OGT(GenericValue Src1, GenericValue Src2, 442 Type *Ty) { 443 GenericValue Dest; 444 switch (Ty->getTypeID()) { 445 IMPLEMENT_FCMP(>, Float); 446 IMPLEMENT_FCMP(>, Double); 447 IMPLEMENT_VECTOR_FCMP(>); 448 default: 449 dbgs() << "Unhandled type for FCmp GT instruction: " << *Ty << "\n"; 450 llvm_unreachable(0); 451 } 452 return Dest; 453 } 454 455 #define IMPLEMENT_UNORDERED(TY, X,Y) \ 456 if (TY->isFloatTy()) { \ 457 if (X.FloatVal != X.FloatVal || Y.FloatVal != Y.FloatVal) { \ 458 Dest.IntVal = APInt(1,true); \ 459 return Dest; \ 460 } \ 461 } else if (X.DoubleVal != X.DoubleVal || Y.DoubleVal != Y.DoubleVal) { \ 462 Dest.IntVal = APInt(1,true); \ 463 return Dest; \ 464 } 465 466 #define IMPLEMENT_VECTOR_UNORDERED(TY, X,Y, _FUNC) \ 467 if (TY->isVectorTy()) { \ 468 GenericValue DestMask = Dest; \ 469 Dest = _FUNC(Src1, Src2, Ty); \ 470 for( size_t _i=0; _i<Src1.AggregateVal.size(); _i++) \ 471 if (DestMask.AggregateVal[_i].IntVal == true) \ 472 Dest.AggregateVal[_i].IntVal = APInt(1,true); \ 473 return Dest; \ 474 } 475 476 static GenericValue executeFCMP_UEQ(GenericValue Src1, GenericValue Src2, 477 Type *Ty) { 478 GenericValue Dest; 479 IMPLEMENT_UNORDERED(Ty, Src1, Src2) 480 MASK_VECTOR_NANS(Ty, Src1, Src2, true) 481 IMPLEMENT_VECTOR_UNORDERED(Ty, Src1, Src2, executeFCMP_OEQ) 482 return executeFCMP_OEQ(Src1, Src2, Ty); 483 484 } 485 486 static GenericValue executeFCMP_UNE(GenericValue Src1, GenericValue Src2, 487 Type *Ty) { 488 GenericValue Dest; 489 IMPLEMENT_UNORDERED(Ty, Src1, Src2) 490 MASK_VECTOR_NANS(Ty, Src1, Src2, true) 491 IMPLEMENT_VECTOR_UNORDERED(Ty, Src1, Src2, executeFCMP_ONE) 492 return executeFCMP_ONE(Src1, Src2, Ty); 493 } 494 495 static GenericValue executeFCMP_ULE(GenericValue Src1, GenericValue Src2, 496 Type *Ty) { 497 GenericValue Dest; 498 IMPLEMENT_UNORDERED(Ty, Src1, Src2) 499 MASK_VECTOR_NANS(Ty, Src1, Src2, true) 500 IMPLEMENT_VECTOR_UNORDERED(Ty, Src1, Src2, executeFCMP_OLE) 501 return executeFCMP_OLE(Src1, Src2, Ty); 502 } 503 504 static GenericValue executeFCMP_UGE(GenericValue Src1, GenericValue Src2, 505 Type *Ty) { 506 GenericValue Dest; 507 IMPLEMENT_UNORDERED(Ty, Src1, Src2) 508 MASK_VECTOR_NANS(Ty, Src1, Src2, true) 509 IMPLEMENT_VECTOR_UNORDERED(Ty, Src1, Src2, executeFCMP_OGE) 510 return executeFCMP_OGE(Src1, Src2, Ty); 511 } 512 513 static GenericValue executeFCMP_ULT(GenericValue Src1, GenericValue Src2, 514 Type *Ty) { 515 GenericValue Dest; 516 IMPLEMENT_UNORDERED(Ty, Src1, Src2) 517 MASK_VECTOR_NANS(Ty, Src1, Src2, true) 518 IMPLEMENT_VECTOR_UNORDERED(Ty, Src1, Src2, executeFCMP_OLT) 519 return executeFCMP_OLT(Src1, Src2, Ty); 520 } 521 522 static GenericValue executeFCMP_UGT(GenericValue Src1, GenericValue Src2, 523 Type *Ty) { 524 GenericValue Dest; 525 IMPLEMENT_UNORDERED(Ty, Src1, Src2) 526 MASK_VECTOR_NANS(Ty, Src1, Src2, true) 527 IMPLEMENT_VECTOR_UNORDERED(Ty, Src1, Src2, executeFCMP_OGT) 528 return executeFCMP_OGT(Src1, Src2, Ty); 529 } 530 531 static GenericValue executeFCMP_ORD(GenericValue Src1, GenericValue Src2, 532 Type *Ty) { 533 GenericValue Dest; 534 if(Ty->isVectorTy()) { 535 assert(Src1.AggregateVal.size() == Src2.AggregateVal.size()); 536 Dest.AggregateVal.resize( Src1.AggregateVal.size() ); 537 if(dyn_cast<VectorType>(Ty)->getElementType()->isFloatTy()) { 538 for( size_t _i=0;_i<Src1.AggregateVal.size();_i++) 539 Dest.AggregateVal[_i].IntVal = APInt(1, 540 ( (Src1.AggregateVal[_i].FloatVal == 541 Src1.AggregateVal[_i].FloatVal) && 542 (Src2.AggregateVal[_i].FloatVal == 543 Src2.AggregateVal[_i].FloatVal))); 544 } else { 545 for( size_t _i=0;_i<Src1.AggregateVal.size();_i++) 546 Dest.AggregateVal[_i].IntVal = APInt(1, 547 ( (Src1.AggregateVal[_i].DoubleVal == 548 Src1.AggregateVal[_i].DoubleVal) && 549 (Src2.AggregateVal[_i].DoubleVal == 550 Src2.AggregateVal[_i].DoubleVal))); 551 } 552 } else if (Ty->isFloatTy()) 553 Dest.IntVal = APInt(1,(Src1.FloatVal == Src1.FloatVal && 554 Src2.FloatVal == Src2.FloatVal)); 555 else { 556 Dest.IntVal = APInt(1,(Src1.DoubleVal == Src1.DoubleVal && 557 Src2.DoubleVal == Src2.DoubleVal)); 558 } 559 return Dest; 560 } 561 562 static GenericValue executeFCMP_UNO(GenericValue Src1, GenericValue Src2, 563 Type *Ty) { 564 GenericValue Dest; 565 if(Ty->isVectorTy()) { 566 assert(Src1.AggregateVal.size() == Src2.AggregateVal.size()); 567 Dest.AggregateVal.resize( Src1.AggregateVal.size() ); 568 if(dyn_cast<VectorType>(Ty)->getElementType()->isFloatTy()) { 569 for( size_t _i=0;_i<Src1.AggregateVal.size();_i++) 570 Dest.AggregateVal[_i].IntVal = APInt(1, 571 ( (Src1.AggregateVal[_i].FloatVal != 572 Src1.AggregateVal[_i].FloatVal) || 573 (Src2.AggregateVal[_i].FloatVal != 574 Src2.AggregateVal[_i].FloatVal))); 575 } else { 576 for( size_t _i=0;_i<Src1.AggregateVal.size();_i++) 577 Dest.AggregateVal[_i].IntVal = APInt(1, 578 ( (Src1.AggregateVal[_i].DoubleVal != 579 Src1.AggregateVal[_i].DoubleVal) || 580 (Src2.AggregateVal[_i].DoubleVal != 581 Src2.AggregateVal[_i].DoubleVal))); 582 } 583 } else if (Ty->isFloatTy()) 584 Dest.IntVal = APInt(1,(Src1.FloatVal != Src1.FloatVal || 585 Src2.FloatVal != Src2.FloatVal)); 586 else { 587 Dest.IntVal = APInt(1,(Src1.DoubleVal != Src1.DoubleVal || 588 Src2.DoubleVal != Src2.DoubleVal)); 589 } 590 return Dest; 591 } 592 593 static GenericValue executeFCMP_BOOL(GenericValue Src1, GenericValue Src2, 594 const Type *Ty, const bool val) { 595 GenericValue Dest; 596 if(Ty->isVectorTy()) { 597 assert(Src1.AggregateVal.size() == Src2.AggregateVal.size()); 598 Dest.AggregateVal.resize( Src1.AggregateVal.size() ); 599 for( size_t _i=0; _i<Src1.AggregateVal.size(); _i++) 600 Dest.AggregateVal[_i].IntVal = APInt(1,val); 601 } else { 602 Dest.IntVal = APInt(1, val); 603 } 604 605 return Dest; 606 } 607 608 void Interpreter::visitFCmpInst(FCmpInst &I) { 609 ExecutionContext &SF = ECStack.back(); 610 Type *Ty = I.getOperand(0)->getType(); 611 GenericValue Src1 = getOperandValue(I.getOperand(0), SF); 612 GenericValue Src2 = getOperandValue(I.getOperand(1), SF); 613 GenericValue R; // Result 614 615 switch (I.getPredicate()) { 616 default: 617 dbgs() << "Don't know how to handle this FCmp predicate!\n-->" << I; 618 llvm_unreachable(0); 619 break; 620 case FCmpInst::FCMP_FALSE: R = executeFCMP_BOOL(Src1, Src2, Ty, false); 621 break; 622 case FCmpInst::FCMP_TRUE: R = executeFCMP_BOOL(Src1, Src2, Ty, true); 623 break; 624 case FCmpInst::FCMP_ORD: R = executeFCMP_ORD(Src1, Src2, Ty); break; 625 case FCmpInst::FCMP_UNO: R = executeFCMP_UNO(Src1, Src2, Ty); break; 626 case FCmpInst::FCMP_UEQ: R = executeFCMP_UEQ(Src1, Src2, Ty); break; 627 case FCmpInst::FCMP_OEQ: R = executeFCMP_OEQ(Src1, Src2, Ty); break; 628 case FCmpInst::FCMP_UNE: R = executeFCMP_UNE(Src1, Src2, Ty); break; 629 case FCmpInst::FCMP_ONE: R = executeFCMP_ONE(Src1, Src2, Ty); break; 630 case FCmpInst::FCMP_ULT: R = executeFCMP_ULT(Src1, Src2, Ty); break; 631 case FCmpInst::FCMP_OLT: R = executeFCMP_OLT(Src1, Src2, Ty); break; 632 case FCmpInst::FCMP_UGT: R = executeFCMP_UGT(Src1, Src2, Ty); break; 633 case FCmpInst::FCMP_OGT: R = executeFCMP_OGT(Src1, Src2, Ty); break; 634 case FCmpInst::FCMP_ULE: R = executeFCMP_ULE(Src1, Src2, Ty); break; 635 case FCmpInst::FCMP_OLE: R = executeFCMP_OLE(Src1, Src2, Ty); break; 636 case FCmpInst::FCMP_UGE: R = executeFCMP_UGE(Src1, Src2, Ty); break; 637 case FCmpInst::FCMP_OGE: R = executeFCMP_OGE(Src1, Src2, Ty); break; 638 } 639 640 SetValue(&I, R, SF); 641 } 642 643 static GenericValue executeCmpInst(unsigned predicate, GenericValue Src1, 644 GenericValue Src2, Type *Ty) { 645 GenericValue Result; 646 switch (predicate) { 647 case ICmpInst::ICMP_EQ: return executeICMP_EQ(Src1, Src2, Ty); 648 case ICmpInst::ICMP_NE: return executeICMP_NE(Src1, Src2, Ty); 649 case ICmpInst::ICMP_UGT: return executeICMP_UGT(Src1, Src2, Ty); 650 case ICmpInst::ICMP_SGT: return executeICMP_SGT(Src1, Src2, Ty); 651 case ICmpInst::ICMP_ULT: return executeICMP_ULT(Src1, Src2, Ty); 652 case ICmpInst::ICMP_SLT: return executeICMP_SLT(Src1, Src2, Ty); 653 case ICmpInst::ICMP_UGE: return executeICMP_UGE(Src1, Src2, Ty); 654 case ICmpInst::ICMP_SGE: return executeICMP_SGE(Src1, Src2, Ty); 655 case ICmpInst::ICMP_ULE: return executeICMP_ULE(Src1, Src2, Ty); 656 case ICmpInst::ICMP_SLE: return executeICMP_SLE(Src1, Src2, Ty); 657 case FCmpInst::FCMP_ORD: return executeFCMP_ORD(Src1, Src2, Ty); 658 case FCmpInst::FCMP_UNO: return executeFCMP_UNO(Src1, Src2, Ty); 659 case FCmpInst::FCMP_OEQ: return executeFCMP_OEQ(Src1, Src2, Ty); 660 case FCmpInst::FCMP_UEQ: return executeFCMP_UEQ(Src1, Src2, Ty); 661 case FCmpInst::FCMP_ONE: return executeFCMP_ONE(Src1, Src2, Ty); 662 case FCmpInst::FCMP_UNE: return executeFCMP_UNE(Src1, Src2, Ty); 663 case FCmpInst::FCMP_OLT: return executeFCMP_OLT(Src1, Src2, Ty); 664 case FCmpInst::FCMP_ULT: return executeFCMP_ULT(Src1, Src2, Ty); 665 case FCmpInst::FCMP_OGT: return executeFCMP_OGT(Src1, Src2, Ty); 666 case FCmpInst::FCMP_UGT: return executeFCMP_UGT(Src1, Src2, Ty); 667 case FCmpInst::FCMP_OLE: return executeFCMP_OLE(Src1, Src2, Ty); 668 case FCmpInst::FCMP_ULE: return executeFCMP_ULE(Src1, Src2, Ty); 669 case FCmpInst::FCMP_OGE: return executeFCMP_OGE(Src1, Src2, Ty); 670 case FCmpInst::FCMP_UGE: return executeFCMP_UGE(Src1, Src2, Ty); 671 case FCmpInst::FCMP_FALSE: return executeFCMP_BOOL(Src1, Src2, Ty, false); 672 case FCmpInst::FCMP_TRUE: return executeFCMP_BOOL(Src1, Src2, Ty, true); 673 default: 674 dbgs() << "Unhandled Cmp predicate\n"; 675 llvm_unreachable(0); 676 } 677 } 678 679 void Interpreter::visitBinaryOperator(BinaryOperator &I) { 680 ExecutionContext &SF = ECStack.back(); 681 Type *Ty = I.getOperand(0)->getType(); 682 GenericValue Src1 = getOperandValue(I.getOperand(0), SF); 683 GenericValue Src2 = getOperandValue(I.getOperand(1), SF); 684 GenericValue R; // Result 685 686 // First process vector operation 687 if (Ty->isVectorTy()) { 688 assert(Src1.AggregateVal.size() == Src2.AggregateVal.size()); 689 R.AggregateVal.resize(Src1.AggregateVal.size()); 690 691 // Macros to execute binary operation 'OP' over integer vectors 692 #define INTEGER_VECTOR_OPERATION(OP) \ 693 for (unsigned i = 0; i < R.AggregateVal.size(); ++i) \ 694 R.AggregateVal[i].IntVal = \ 695 Src1.AggregateVal[i].IntVal OP Src2.AggregateVal[i].IntVal; 696 697 // Additional macros to execute binary operations udiv/sdiv/urem/srem since 698 // they have different notation. 699 #define INTEGER_VECTOR_FUNCTION(OP) \ 700 for (unsigned i = 0; i < R.AggregateVal.size(); ++i) \ 701 R.AggregateVal[i].IntVal = \ 702 Src1.AggregateVal[i].IntVal.OP(Src2.AggregateVal[i].IntVal); 703 704 // Macros to execute binary operation 'OP' over floating point type TY 705 // (float or double) vectors 706 #define FLOAT_VECTOR_FUNCTION(OP, TY) \ 707 for (unsigned i = 0; i < R.AggregateVal.size(); ++i) \ 708 R.AggregateVal[i].TY = \ 709 Src1.AggregateVal[i].TY OP Src2.AggregateVal[i].TY; 710 711 // Macros to choose appropriate TY: float or double and run operation 712 // execution 713 #define FLOAT_VECTOR_OP(OP) { \ 714 if (dyn_cast<VectorType>(Ty)->getElementType()->isFloatTy()) \ 715 FLOAT_VECTOR_FUNCTION(OP, FloatVal) \ 716 else { \ 717 if (dyn_cast<VectorType>(Ty)->getElementType()->isDoubleTy()) \ 718 FLOAT_VECTOR_FUNCTION(OP, DoubleVal) \ 719 else { \ 720 dbgs() << "Unhandled type for OP instruction: " << *Ty << "\n"; \ 721 llvm_unreachable(0); \ 722 } \ 723 } \ 724 } 725 726 switch(I.getOpcode()){ 727 default: 728 dbgs() << "Don't know how to handle this binary operator!\n-->" << I; 729 llvm_unreachable(0); 730 break; 731 case Instruction::Add: INTEGER_VECTOR_OPERATION(+) break; 732 case Instruction::Sub: INTEGER_VECTOR_OPERATION(-) break; 733 case Instruction::Mul: INTEGER_VECTOR_OPERATION(*) break; 734 case Instruction::UDiv: INTEGER_VECTOR_FUNCTION(udiv) break; 735 case Instruction::SDiv: INTEGER_VECTOR_FUNCTION(sdiv) break; 736 case Instruction::URem: INTEGER_VECTOR_FUNCTION(urem) break; 737 case Instruction::SRem: INTEGER_VECTOR_FUNCTION(srem) break; 738 case Instruction::And: INTEGER_VECTOR_OPERATION(&) break; 739 case Instruction::Or: INTEGER_VECTOR_OPERATION(|) break; 740 case Instruction::Xor: INTEGER_VECTOR_OPERATION(^) break; 741 case Instruction::FAdd: FLOAT_VECTOR_OP(+) break; 742 case Instruction::FSub: FLOAT_VECTOR_OP(-) break; 743 case Instruction::FMul: FLOAT_VECTOR_OP(*) break; 744 case Instruction::FDiv: FLOAT_VECTOR_OP(/) break; 745 case Instruction::FRem: 746 if (dyn_cast<VectorType>(Ty)->getElementType()->isFloatTy()) 747 for (unsigned i = 0; i < R.AggregateVal.size(); ++i) 748 R.AggregateVal[i].FloatVal = 749 fmod(Src1.AggregateVal[i].FloatVal, Src2.AggregateVal[i].FloatVal); 750 else { 751 if (dyn_cast<VectorType>(Ty)->getElementType()->isDoubleTy()) 752 for (unsigned i = 0; i < R.AggregateVal.size(); ++i) 753 R.AggregateVal[i].DoubleVal = 754 fmod(Src1.AggregateVal[i].DoubleVal, Src2.AggregateVal[i].DoubleVal); 755 else { 756 dbgs() << "Unhandled type for Rem instruction: " << *Ty << "\n"; 757 llvm_unreachable(0); 758 } 759 } 760 break; 761 } 762 } else { 763 switch (I.getOpcode()) { 764 default: 765 dbgs() << "Don't know how to handle this binary operator!\n-->" << I; 766 llvm_unreachable(0); 767 break; 768 case Instruction::Add: R.IntVal = Src1.IntVal + Src2.IntVal; break; 769 case Instruction::Sub: R.IntVal = Src1.IntVal - Src2.IntVal; break; 770 case Instruction::Mul: R.IntVal = Src1.IntVal * Src2.IntVal; break; 771 case Instruction::FAdd: executeFAddInst(R, Src1, Src2, Ty); break; 772 case Instruction::FSub: executeFSubInst(R, Src1, Src2, Ty); break; 773 case Instruction::FMul: executeFMulInst(R, Src1, Src2, Ty); break; 774 case Instruction::FDiv: executeFDivInst(R, Src1, Src2, Ty); break; 775 case Instruction::FRem: executeFRemInst(R, Src1, Src2, Ty); break; 776 case Instruction::UDiv: R.IntVal = Src1.IntVal.udiv(Src2.IntVal); break; 777 case Instruction::SDiv: R.IntVal = Src1.IntVal.sdiv(Src2.IntVal); break; 778 case Instruction::URem: R.IntVal = Src1.IntVal.urem(Src2.IntVal); break; 779 case Instruction::SRem: R.IntVal = Src1.IntVal.srem(Src2.IntVal); break; 780 case Instruction::And: R.IntVal = Src1.IntVal & Src2.IntVal; break; 781 case Instruction::Or: R.IntVal = Src1.IntVal | Src2.IntVal; break; 782 case Instruction::Xor: R.IntVal = Src1.IntVal ^ Src2.IntVal; break; 783 } 784 } 785 SetValue(&I, R, SF); 786 } 787 788 static GenericValue executeSelectInst(GenericValue Src1, GenericValue Src2, 789 GenericValue Src3) { 790 return Src1.IntVal == 0 ? Src3 : Src2; 791 } 792 793 void Interpreter::visitSelectInst(SelectInst &I) { 794 ExecutionContext &SF = ECStack.back(); 795 GenericValue Src1 = getOperandValue(I.getOperand(0), SF); 796 GenericValue Src2 = getOperandValue(I.getOperand(1), SF); 797 GenericValue Src3 = getOperandValue(I.getOperand(2), SF); 798 GenericValue R = executeSelectInst(Src1, Src2, Src3); 799 SetValue(&I, R, SF); 800 } 801 802 803 //===----------------------------------------------------------------------===// 804 // Terminator Instruction Implementations 805 //===----------------------------------------------------------------------===// 806 807 void Interpreter::exitCalled(GenericValue GV) { 808 // runAtExitHandlers() assumes there are no stack frames, but 809 // if exit() was called, then it had a stack frame. Blow away 810 // the stack before interpreting atexit handlers. 811 ECStack.clear(); 812 runAtExitHandlers(); 813 exit(GV.IntVal.zextOrTrunc(32).getZExtValue()); 814 } 815 816 /// Pop the last stack frame off of ECStack and then copy the result 817 /// back into the result variable if we are not returning void. The 818 /// result variable may be the ExitValue, or the Value of the calling 819 /// CallInst if there was a previous stack frame. This method may 820 /// invalidate any ECStack iterators you have. This method also takes 821 /// care of switching to the normal destination BB, if we are returning 822 /// from an invoke. 823 /// 824 void Interpreter::popStackAndReturnValueToCaller(Type *RetTy, 825 GenericValue Result) { 826 // Pop the current stack frame. 827 ECStack.pop_back(); 828 829 if (ECStack.empty()) { // Finished main. Put result into exit code... 830 if (RetTy && !RetTy->isVoidTy()) { // Nonvoid return type? 831 ExitValue = Result; // Capture the exit value of the program 832 } else { 833 memset(&ExitValue.Untyped, 0, sizeof(ExitValue.Untyped)); 834 } 835 } else { 836 // If we have a previous stack frame, and we have a previous call, 837 // fill in the return value... 838 ExecutionContext &CallingSF = ECStack.back(); 839 if (Instruction *I = CallingSF.Caller.getInstruction()) { 840 // Save result... 841 if (!CallingSF.Caller.getType()->isVoidTy()) 842 SetValue(I, Result, CallingSF); 843 if (InvokeInst *II = dyn_cast<InvokeInst> (I)) 844 SwitchToNewBasicBlock (II->getNormalDest (), CallingSF); 845 CallingSF.Caller = CallSite(); // We returned from the call... 846 } 847 } 848 } 849 850 void Interpreter::visitReturnInst(ReturnInst &I) { 851 ExecutionContext &SF = ECStack.back(); 852 Type *RetTy = Type::getVoidTy(I.getContext()); 853 GenericValue Result; 854 855 // Save away the return value... (if we are not 'ret void') 856 if (I.getNumOperands()) { 857 RetTy = I.getReturnValue()->getType(); 858 Result = getOperandValue(I.getReturnValue(), SF); 859 } 860 861 popStackAndReturnValueToCaller(RetTy, Result); 862 } 863 864 void Interpreter::visitUnreachableInst(UnreachableInst &I) { 865 report_fatal_error("Program executed an 'unreachable' instruction!"); 866 } 867 868 void Interpreter::visitBranchInst(BranchInst &I) { 869 ExecutionContext &SF = ECStack.back(); 870 BasicBlock *Dest; 871 872 Dest = I.getSuccessor(0); // Uncond branches have a fixed dest... 873 if (!I.isUnconditional()) { 874 Value *Cond = I.getCondition(); 875 if (getOperandValue(Cond, SF).IntVal == 0) // If false cond... 876 Dest = I.getSuccessor(1); 877 } 878 SwitchToNewBasicBlock(Dest, SF); 879 } 880 881 void Interpreter::visitSwitchInst(SwitchInst &I) { 882 ExecutionContext &SF = ECStack.back(); 883 Value* Cond = I.getCondition(); 884 Type *ElTy = Cond->getType(); 885 GenericValue CondVal = getOperandValue(Cond, SF); 886 887 // Check to see if any of the cases match... 888 BasicBlock *Dest = 0; 889 for (SwitchInst::CaseIt i = I.case_begin(), e = I.case_end(); i != e; ++i) { 890 IntegersSubset& Case = i.getCaseValueEx(); 891 if (Case.isSingleNumber()) { 892 // FIXME: Currently work with ConstantInt based numbers. 893 const ConstantInt *CI = Case.getSingleNumber(0).toConstantInt(); 894 GenericValue Val = getOperandValue(const_cast<ConstantInt*>(CI), SF); 895 if (executeICMP_EQ(Val, CondVal, ElTy).IntVal != 0) { 896 Dest = cast<BasicBlock>(i.getCaseSuccessor()); 897 break; 898 } 899 } 900 if (Case.isSingleNumbersOnly()) { 901 for (unsigned n = 0, en = Case.getNumItems(); n != en; ++n) { 902 // FIXME: Currently work with ConstantInt based numbers. 903 const ConstantInt *CI = Case.getSingleNumber(n).toConstantInt(); 904 GenericValue Val = getOperandValue(const_cast<ConstantInt*>(CI), SF); 905 if (executeICMP_EQ(Val, CondVal, ElTy).IntVal != 0) { 906 Dest = cast<BasicBlock>(i.getCaseSuccessor()); 907 break; 908 } 909 } 910 } else 911 for (unsigned n = 0, en = Case.getNumItems(); n != en; ++n) { 912 IntegersSubset::Range r = Case.getItem(n); 913 // FIXME: Currently work with ConstantInt based numbers. 914 const ConstantInt *LowCI = r.getLow().toConstantInt(); 915 const ConstantInt *HighCI = r.getHigh().toConstantInt(); 916 GenericValue Low = getOperandValue(const_cast<ConstantInt*>(LowCI), SF); 917 GenericValue High = getOperandValue(const_cast<ConstantInt*>(HighCI), SF); 918 if (executeICMP_ULE(Low, CondVal, ElTy).IntVal != 0 && 919 executeICMP_ULE(CondVal, High, ElTy).IntVal != 0) { 920 Dest = cast<BasicBlock>(i.getCaseSuccessor()); 921 break; 922 } 923 } 924 } 925 if (!Dest) Dest = I.getDefaultDest(); // No cases matched: use default 926 SwitchToNewBasicBlock(Dest, SF); 927 } 928 929 void Interpreter::visitIndirectBrInst(IndirectBrInst &I) { 930 ExecutionContext &SF = ECStack.back(); 931 void *Dest = GVTOP(getOperandValue(I.getAddress(), SF)); 932 SwitchToNewBasicBlock((BasicBlock*)Dest, SF); 933 } 934 935 936 // SwitchToNewBasicBlock - This method is used to jump to a new basic block. 937 // This function handles the actual updating of block and instruction iterators 938 // as well as execution of all of the PHI nodes in the destination block. 939 // 940 // This method does this because all of the PHI nodes must be executed 941 // atomically, reading their inputs before any of the results are updated. Not 942 // doing this can cause problems if the PHI nodes depend on other PHI nodes for 943 // their inputs. If the input PHI node is updated before it is read, incorrect 944 // results can happen. Thus we use a two phase approach. 945 // 946 void Interpreter::SwitchToNewBasicBlock(BasicBlock *Dest, ExecutionContext &SF){ 947 BasicBlock *PrevBB = SF.CurBB; // Remember where we came from... 948 SF.CurBB = Dest; // Update CurBB to branch destination 949 SF.CurInst = SF.CurBB->begin(); // Update new instruction ptr... 950 951 if (!isa<PHINode>(SF.CurInst)) return; // Nothing fancy to do 952 953 // Loop over all of the PHI nodes in the current block, reading their inputs. 954 std::vector<GenericValue> ResultValues; 955 956 for (; PHINode *PN = dyn_cast<PHINode>(SF.CurInst); ++SF.CurInst) { 957 // Search for the value corresponding to this previous bb... 958 int i = PN->getBasicBlockIndex(PrevBB); 959 assert(i != -1 && "PHINode doesn't contain entry for predecessor??"); 960 Value *IncomingValue = PN->getIncomingValue(i); 961 962 // Save the incoming value for this PHI node... 963 ResultValues.push_back(getOperandValue(IncomingValue, SF)); 964 } 965 966 // Now loop over all of the PHI nodes setting their values... 967 SF.CurInst = SF.CurBB->begin(); 968 for (unsigned i = 0; isa<PHINode>(SF.CurInst); ++SF.CurInst, ++i) { 969 PHINode *PN = cast<PHINode>(SF.CurInst); 970 SetValue(PN, ResultValues[i], SF); 971 } 972 } 973 974 //===----------------------------------------------------------------------===// 975 // Memory Instruction Implementations 976 //===----------------------------------------------------------------------===// 977 978 void Interpreter::visitAllocaInst(AllocaInst &I) { 979 ExecutionContext &SF = ECStack.back(); 980 981 Type *Ty = I.getType()->getElementType(); // Type to be allocated 982 983 // Get the number of elements being allocated by the array... 984 unsigned NumElements = 985 getOperandValue(I.getOperand(0), SF).IntVal.getZExtValue(); 986 987 unsigned TypeSize = (size_t)TD.getTypeAllocSize(Ty); 988 989 // Avoid malloc-ing zero bytes, use max()... 990 unsigned MemToAlloc = std::max(1U, NumElements * TypeSize); 991 992 // Allocate enough memory to hold the type... 993 void *Memory = malloc(MemToAlloc); 994 995 DEBUG(dbgs() << "Allocated Type: " << *Ty << " (" << TypeSize << " bytes) x " 996 << NumElements << " (Total: " << MemToAlloc << ") at " 997 << uintptr_t(Memory) << '\n'); 998 999 GenericValue Result = PTOGV(Memory); 1000 assert(Result.PointerVal != 0 && "Null pointer returned by malloc!"); 1001 SetValue(&I, Result, SF); 1002 1003 if (I.getOpcode() == Instruction::Alloca) 1004 ECStack.back().Allocas.add(Memory); 1005 } 1006 1007 // getElementOffset - The workhorse for getelementptr. 1008 // 1009 GenericValue Interpreter::executeGEPOperation(Value *Ptr, gep_type_iterator I, 1010 gep_type_iterator E, 1011 ExecutionContext &SF) { 1012 assert(Ptr->getType()->isPointerTy() && 1013 "Cannot getElementOffset of a nonpointer type!"); 1014 1015 uint64_t Total = 0; 1016 1017 for (; I != E; ++I) { 1018 if (StructType *STy = dyn_cast<StructType>(*I)) { 1019 const StructLayout *SLO = TD.getStructLayout(STy); 1020 1021 const ConstantInt *CPU = cast<ConstantInt>(I.getOperand()); 1022 unsigned Index = unsigned(CPU->getZExtValue()); 1023 1024 Total += SLO->getElementOffset(Index); 1025 } else { 1026 SequentialType *ST = cast<SequentialType>(*I); 1027 // Get the index number for the array... which must be long type... 1028 GenericValue IdxGV = getOperandValue(I.getOperand(), SF); 1029 1030 int64_t Idx; 1031 unsigned BitWidth = 1032 cast<IntegerType>(I.getOperand()->getType())->getBitWidth(); 1033 if (BitWidth == 32) 1034 Idx = (int64_t)(int32_t)IdxGV.IntVal.getZExtValue(); 1035 else { 1036 assert(BitWidth == 64 && "Invalid index type for getelementptr"); 1037 Idx = (int64_t)IdxGV.IntVal.getZExtValue(); 1038 } 1039 Total += TD.getTypeAllocSize(ST->getElementType())*Idx; 1040 } 1041 } 1042 1043 GenericValue Result; 1044 Result.PointerVal = ((char*)getOperandValue(Ptr, SF).PointerVal) + Total; 1045 DEBUG(dbgs() << "GEP Index " << Total << " bytes.\n"); 1046 return Result; 1047 } 1048 1049 void Interpreter::visitGetElementPtrInst(GetElementPtrInst &I) { 1050 ExecutionContext &SF = ECStack.back(); 1051 SetValue(&I, executeGEPOperation(I.getPointerOperand(), 1052 gep_type_begin(I), gep_type_end(I), SF), SF); 1053 } 1054 1055 void Interpreter::visitLoadInst(LoadInst &I) { 1056 ExecutionContext &SF = ECStack.back(); 1057 GenericValue SRC = getOperandValue(I.getPointerOperand(), SF); 1058 GenericValue *Ptr = (GenericValue*)GVTOP(SRC); 1059 GenericValue Result; 1060 LoadValueFromMemory(Result, Ptr, I.getType()); 1061 SetValue(&I, Result, SF); 1062 if (I.isVolatile() && PrintVolatile) 1063 dbgs() << "Volatile load " << I; 1064 } 1065 1066 void Interpreter::visitStoreInst(StoreInst &I) { 1067 ExecutionContext &SF = ECStack.back(); 1068 GenericValue Val = getOperandValue(I.getOperand(0), SF); 1069 GenericValue SRC = getOperandValue(I.getPointerOperand(), SF); 1070 StoreValueToMemory(Val, (GenericValue *)GVTOP(SRC), 1071 I.getOperand(0)->getType()); 1072 if (I.isVolatile() && PrintVolatile) 1073 dbgs() << "Volatile store: " << I; 1074 } 1075 1076 //===----------------------------------------------------------------------===// 1077 // Miscellaneous Instruction Implementations 1078 //===----------------------------------------------------------------------===// 1079 1080 void Interpreter::visitCallSite(CallSite CS) { 1081 ExecutionContext &SF = ECStack.back(); 1082 1083 // Check to see if this is an intrinsic function call... 1084 Function *F = CS.getCalledFunction(); 1085 if (F && F->isDeclaration()) 1086 switch (F->getIntrinsicID()) { 1087 case Intrinsic::not_intrinsic: 1088 break; 1089 case Intrinsic::vastart: { // va_start 1090 GenericValue ArgIndex; 1091 ArgIndex.UIntPairVal.first = ECStack.size() - 1; 1092 ArgIndex.UIntPairVal.second = 0; 1093 SetValue(CS.getInstruction(), ArgIndex, SF); 1094 return; 1095 } 1096 case Intrinsic::vaend: // va_end is a noop for the interpreter 1097 return; 1098 case Intrinsic::vacopy: // va_copy: dest = src 1099 SetValue(CS.getInstruction(), getOperandValue(*CS.arg_begin(), SF), SF); 1100 return; 1101 default: 1102 // If it is an unknown intrinsic function, use the intrinsic lowering 1103 // class to transform it into hopefully tasty LLVM code. 1104 // 1105 BasicBlock::iterator me(CS.getInstruction()); 1106 BasicBlock *Parent = CS.getInstruction()->getParent(); 1107 bool atBegin(Parent->begin() == me); 1108 if (!atBegin) 1109 --me; 1110 IL->LowerIntrinsicCall(cast<CallInst>(CS.getInstruction())); 1111 1112 // Restore the CurInst pointer to the first instruction newly inserted, if 1113 // any. 1114 if (atBegin) { 1115 SF.CurInst = Parent->begin(); 1116 } else { 1117 SF.CurInst = me; 1118 ++SF.CurInst; 1119 } 1120 return; 1121 } 1122 1123 1124 SF.Caller = CS; 1125 std::vector<GenericValue> ArgVals; 1126 const unsigned NumArgs = SF.Caller.arg_size(); 1127 ArgVals.reserve(NumArgs); 1128 uint16_t pNum = 1; 1129 for (CallSite::arg_iterator i = SF.Caller.arg_begin(), 1130 e = SF.Caller.arg_end(); i != e; ++i, ++pNum) { 1131 Value *V = *i; 1132 ArgVals.push_back(getOperandValue(V, SF)); 1133 } 1134 1135 // To handle indirect calls, we must get the pointer value from the argument 1136 // and treat it as a function pointer. 1137 GenericValue SRC = getOperandValue(SF.Caller.getCalledValue(), SF); 1138 callFunction((Function*)GVTOP(SRC), ArgVals); 1139 } 1140 1141 // auxilary function for shift operations 1142 static unsigned getShiftAmount(uint64_t orgShiftAmount, 1143 llvm::APInt valueToShift) { 1144 unsigned valueWidth = valueToShift.getBitWidth(); 1145 if (orgShiftAmount < (uint64_t)valueWidth) 1146 return orgShiftAmount; 1147 // according to the llvm documentation, if orgShiftAmount > valueWidth, 1148 // the result is undfeined. but we do shift by this rule: 1149 return (NextPowerOf2(valueWidth-1) - 1) & orgShiftAmount; 1150 } 1151 1152 1153 void Interpreter::visitShl(BinaryOperator &I) { 1154 ExecutionContext &SF = ECStack.back(); 1155 GenericValue Src1 = getOperandValue(I.getOperand(0), SF); 1156 GenericValue Src2 = getOperandValue(I.getOperand(1), SF); 1157 GenericValue Dest; 1158 const Type *Ty = I.getType(); 1159 1160 if (Ty->isVectorTy()) { 1161 uint32_t src1Size = uint32_t(Src1.AggregateVal.size()); 1162 assert(src1Size == Src2.AggregateVal.size()); 1163 for (unsigned i = 0; i < src1Size; i++) { 1164 GenericValue Result; 1165 uint64_t shiftAmount = Src2.AggregateVal[i].IntVal.getZExtValue(); 1166 llvm::APInt valueToShift = Src1.AggregateVal[i].IntVal; 1167 Result.IntVal = valueToShift.shl(getShiftAmount(shiftAmount, valueToShift)); 1168 Dest.AggregateVal.push_back(Result); 1169 } 1170 } else { 1171 // scalar 1172 uint64_t shiftAmount = Src2.IntVal.getZExtValue(); 1173 llvm::APInt valueToShift = Src1.IntVal; 1174 Dest.IntVal = valueToShift.shl(getShiftAmount(shiftAmount, valueToShift)); 1175 } 1176 1177 SetValue(&I, Dest, SF); 1178 } 1179 1180 void Interpreter::visitLShr(BinaryOperator &I) { 1181 ExecutionContext &SF = ECStack.back(); 1182 GenericValue Src1 = getOperandValue(I.getOperand(0), SF); 1183 GenericValue Src2 = getOperandValue(I.getOperand(1), SF); 1184 GenericValue Dest; 1185 const Type *Ty = I.getType(); 1186 1187 if (Ty->isVectorTy()) { 1188 uint32_t src1Size = uint32_t(Src1.AggregateVal.size()); 1189 assert(src1Size == Src2.AggregateVal.size()); 1190 for (unsigned i = 0; i < src1Size; i++) { 1191 GenericValue Result; 1192 uint64_t shiftAmount = Src2.AggregateVal[i].IntVal.getZExtValue(); 1193 llvm::APInt valueToShift = Src1.AggregateVal[i].IntVal; 1194 Result.IntVal = valueToShift.lshr(getShiftAmount(shiftAmount, valueToShift)); 1195 Dest.AggregateVal.push_back(Result); 1196 } 1197 } else { 1198 // scalar 1199 uint64_t shiftAmount = Src2.IntVal.getZExtValue(); 1200 llvm::APInt valueToShift = Src1.IntVal; 1201 Dest.IntVal = valueToShift.lshr(getShiftAmount(shiftAmount, valueToShift)); 1202 } 1203 1204 SetValue(&I, Dest, SF); 1205 } 1206 1207 void Interpreter::visitAShr(BinaryOperator &I) { 1208 ExecutionContext &SF = ECStack.back(); 1209 GenericValue Src1 = getOperandValue(I.getOperand(0), SF); 1210 GenericValue Src2 = getOperandValue(I.getOperand(1), SF); 1211 GenericValue Dest; 1212 const Type *Ty = I.getType(); 1213 1214 if (Ty->isVectorTy()) { 1215 size_t src1Size = Src1.AggregateVal.size(); 1216 assert(src1Size == Src2.AggregateVal.size()); 1217 for (unsigned i = 0; i < src1Size; i++) { 1218 GenericValue Result; 1219 uint64_t shiftAmount = Src2.AggregateVal[i].IntVal.getZExtValue(); 1220 llvm::APInt valueToShift = Src1.AggregateVal[i].IntVal; 1221 Result.IntVal = valueToShift.ashr(getShiftAmount(shiftAmount, valueToShift)); 1222 Dest.AggregateVal.push_back(Result); 1223 } 1224 } else { 1225 // scalar 1226 uint64_t shiftAmount = Src2.IntVal.getZExtValue(); 1227 llvm::APInt valueToShift = Src1.IntVal; 1228 Dest.IntVal = valueToShift.ashr(getShiftAmount(shiftAmount, valueToShift)); 1229 } 1230 1231 SetValue(&I, Dest, SF); 1232 } 1233 1234 GenericValue Interpreter::executeTruncInst(Value *SrcVal, Type *DstTy, 1235 ExecutionContext &SF) { 1236 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1237 Type *SrcTy = SrcVal->getType(); 1238 if (SrcTy->isVectorTy()) { 1239 Type *DstVecTy = DstTy->getScalarType(); 1240 unsigned DBitWidth = cast<IntegerType>(DstVecTy)->getBitWidth(); 1241 unsigned NumElts = Src.AggregateVal.size(); 1242 // the sizes of src and dst vectors must be equal 1243 Dest.AggregateVal.resize(NumElts); 1244 for (unsigned i = 0; i < NumElts; i++) 1245 Dest.AggregateVal[i].IntVal = Src.AggregateVal[i].IntVal.trunc(DBitWidth); 1246 } else { 1247 IntegerType *DITy = cast<IntegerType>(DstTy); 1248 unsigned DBitWidth = DITy->getBitWidth(); 1249 Dest.IntVal = Src.IntVal.trunc(DBitWidth); 1250 } 1251 return Dest; 1252 } 1253 1254 GenericValue Interpreter::executeSExtInst(Value *SrcVal, Type *DstTy, 1255 ExecutionContext &SF) { 1256 const Type *SrcTy = SrcVal->getType(); 1257 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1258 if (SrcTy->isVectorTy()) { 1259 const Type *DstVecTy = DstTy->getScalarType(); 1260 unsigned DBitWidth = cast<IntegerType>(DstVecTy)->getBitWidth(); 1261 unsigned size = Src.AggregateVal.size(); 1262 // the sizes of src and dst vectors must be equal. 1263 Dest.AggregateVal.resize(size); 1264 for (unsigned i = 0; i < size; i++) 1265 Dest.AggregateVal[i].IntVal = Src.AggregateVal[i].IntVal.sext(DBitWidth); 1266 } else { 1267 const IntegerType *DITy = cast<IntegerType>(DstTy); 1268 unsigned DBitWidth = DITy->getBitWidth(); 1269 Dest.IntVal = Src.IntVal.sext(DBitWidth); 1270 } 1271 return Dest; 1272 } 1273 1274 GenericValue Interpreter::executeZExtInst(Value *SrcVal, Type *DstTy, 1275 ExecutionContext &SF) { 1276 const Type *SrcTy = SrcVal->getType(); 1277 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1278 if (SrcTy->isVectorTy()) { 1279 const Type *DstVecTy = DstTy->getScalarType(); 1280 unsigned DBitWidth = cast<IntegerType>(DstVecTy)->getBitWidth(); 1281 1282 unsigned size = Src.AggregateVal.size(); 1283 // the sizes of src and dst vectors must be equal. 1284 Dest.AggregateVal.resize(size); 1285 for (unsigned i = 0; i < size; i++) 1286 Dest.AggregateVal[i].IntVal = Src.AggregateVal[i].IntVal.zext(DBitWidth); 1287 } else { 1288 const IntegerType *DITy = cast<IntegerType>(DstTy); 1289 unsigned DBitWidth = DITy->getBitWidth(); 1290 Dest.IntVal = Src.IntVal.zext(DBitWidth); 1291 } 1292 return Dest; 1293 } 1294 1295 GenericValue Interpreter::executeFPTruncInst(Value *SrcVal, Type *DstTy, 1296 ExecutionContext &SF) { 1297 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1298 1299 if (SrcVal->getType()->getTypeID() == Type::VectorTyID) { 1300 assert(SrcVal->getType()->getScalarType()->isDoubleTy() && 1301 DstTy->getScalarType()->isFloatTy() && 1302 "Invalid FPTrunc instruction"); 1303 1304 unsigned size = Src.AggregateVal.size(); 1305 // the sizes of src and dst vectors must be equal. 1306 Dest.AggregateVal.resize(size); 1307 for (unsigned i = 0; i < size; i++) 1308 Dest.AggregateVal[i].FloatVal = (float)Src.AggregateVal[i].DoubleVal; 1309 } else { 1310 assert(SrcVal->getType()->isDoubleTy() && DstTy->isFloatTy() && 1311 "Invalid FPTrunc instruction"); 1312 Dest.FloatVal = (float)Src.DoubleVal; 1313 } 1314 1315 return Dest; 1316 } 1317 1318 GenericValue Interpreter::executeFPExtInst(Value *SrcVal, Type *DstTy, 1319 ExecutionContext &SF) { 1320 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1321 1322 if (SrcVal->getType()->getTypeID() == Type::VectorTyID) { 1323 assert(SrcVal->getType()->getScalarType()->isFloatTy() && 1324 DstTy->getScalarType()->isDoubleTy() && "Invalid FPExt instruction"); 1325 1326 unsigned size = Src.AggregateVal.size(); 1327 // the sizes of src and dst vectors must be equal. 1328 Dest.AggregateVal.resize(size); 1329 for (unsigned i = 0; i < size; i++) 1330 Dest.AggregateVal[i].DoubleVal = (double)Src.AggregateVal[i].FloatVal; 1331 } else { 1332 assert(SrcVal->getType()->isFloatTy() && DstTy->isDoubleTy() && 1333 "Invalid FPExt instruction"); 1334 Dest.DoubleVal = (double)Src.FloatVal; 1335 } 1336 1337 return Dest; 1338 } 1339 1340 GenericValue Interpreter::executeFPToUIInst(Value *SrcVal, Type *DstTy, 1341 ExecutionContext &SF) { 1342 Type *SrcTy = SrcVal->getType(); 1343 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1344 1345 if (SrcTy->getTypeID() == Type::VectorTyID) { 1346 const Type *DstVecTy = DstTy->getScalarType(); 1347 const Type *SrcVecTy = SrcTy->getScalarType(); 1348 uint32_t DBitWidth = cast<IntegerType>(DstVecTy)->getBitWidth(); 1349 unsigned size = Src.AggregateVal.size(); 1350 // the sizes of src and dst vectors must be equal. 1351 Dest.AggregateVal.resize(size); 1352 1353 if (SrcVecTy->getTypeID() == Type::FloatTyID) { 1354 assert(SrcVecTy->isFloatingPointTy() && "Invalid FPToUI instruction"); 1355 for (unsigned i = 0; i < size; i++) 1356 Dest.AggregateVal[i].IntVal = APIntOps::RoundFloatToAPInt( 1357 Src.AggregateVal[i].FloatVal, DBitWidth); 1358 } else { 1359 for (unsigned i = 0; i < size; i++) 1360 Dest.AggregateVal[i].IntVal = APIntOps::RoundDoubleToAPInt( 1361 Src.AggregateVal[i].DoubleVal, DBitWidth); 1362 } 1363 } else { 1364 // scalar 1365 uint32_t DBitWidth = cast<IntegerType>(DstTy)->getBitWidth(); 1366 assert(SrcTy->isFloatingPointTy() && "Invalid FPToUI instruction"); 1367 1368 if (SrcTy->getTypeID() == Type::FloatTyID) 1369 Dest.IntVal = APIntOps::RoundFloatToAPInt(Src.FloatVal, DBitWidth); 1370 else { 1371 Dest.IntVal = APIntOps::RoundDoubleToAPInt(Src.DoubleVal, DBitWidth); 1372 } 1373 } 1374 1375 return Dest; 1376 } 1377 1378 GenericValue Interpreter::executeFPToSIInst(Value *SrcVal, Type *DstTy, 1379 ExecutionContext &SF) { 1380 Type *SrcTy = SrcVal->getType(); 1381 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1382 1383 if (SrcTy->getTypeID() == Type::VectorTyID) { 1384 const Type *DstVecTy = DstTy->getScalarType(); 1385 const Type *SrcVecTy = SrcTy->getScalarType(); 1386 uint32_t DBitWidth = cast<IntegerType>(DstVecTy)->getBitWidth(); 1387 unsigned size = Src.AggregateVal.size(); 1388 // the sizes of src and dst vectors must be equal 1389 Dest.AggregateVal.resize(size); 1390 1391 if (SrcVecTy->getTypeID() == Type::FloatTyID) { 1392 assert(SrcVecTy->isFloatingPointTy() && "Invalid FPToSI instruction"); 1393 for (unsigned i = 0; i < size; i++) 1394 Dest.AggregateVal[i].IntVal = APIntOps::RoundFloatToAPInt( 1395 Src.AggregateVal[i].FloatVal, DBitWidth); 1396 } else { 1397 for (unsigned i = 0; i < size; i++) 1398 Dest.AggregateVal[i].IntVal = APIntOps::RoundDoubleToAPInt( 1399 Src.AggregateVal[i].DoubleVal, DBitWidth); 1400 } 1401 } else { 1402 // scalar 1403 unsigned DBitWidth = cast<IntegerType>(DstTy)->getBitWidth(); 1404 assert(SrcTy->isFloatingPointTy() && "Invalid FPToSI instruction"); 1405 1406 if (SrcTy->getTypeID() == Type::FloatTyID) 1407 Dest.IntVal = APIntOps::RoundFloatToAPInt(Src.FloatVal, DBitWidth); 1408 else { 1409 Dest.IntVal = APIntOps::RoundDoubleToAPInt(Src.DoubleVal, DBitWidth); 1410 } 1411 } 1412 return Dest; 1413 } 1414 1415 GenericValue Interpreter::executeUIToFPInst(Value *SrcVal, Type *DstTy, 1416 ExecutionContext &SF) { 1417 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1418 1419 if (SrcVal->getType()->getTypeID() == Type::VectorTyID) { 1420 const Type *DstVecTy = DstTy->getScalarType(); 1421 unsigned size = Src.AggregateVal.size(); 1422 // the sizes of src and dst vectors must be equal 1423 Dest.AggregateVal.resize(size); 1424 1425 if (DstVecTy->getTypeID() == Type::FloatTyID) { 1426 assert(DstVecTy->isFloatingPointTy() && "Invalid UIToFP instruction"); 1427 for (unsigned i = 0; i < size; i++) 1428 Dest.AggregateVal[i].FloatVal = 1429 APIntOps::RoundAPIntToFloat(Src.AggregateVal[i].IntVal); 1430 } else { 1431 for (unsigned i = 0; i < size; i++) 1432 Dest.AggregateVal[i].DoubleVal = 1433 APIntOps::RoundAPIntToDouble(Src.AggregateVal[i].IntVal); 1434 } 1435 } else { 1436 // scalar 1437 assert(DstTy->isFloatingPointTy() && "Invalid UIToFP instruction"); 1438 if (DstTy->getTypeID() == Type::FloatTyID) 1439 Dest.FloatVal = APIntOps::RoundAPIntToFloat(Src.IntVal); 1440 else { 1441 Dest.DoubleVal = APIntOps::RoundAPIntToDouble(Src.IntVal); 1442 } 1443 } 1444 return Dest; 1445 } 1446 1447 GenericValue Interpreter::executeSIToFPInst(Value *SrcVal, Type *DstTy, 1448 ExecutionContext &SF) { 1449 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1450 1451 if (SrcVal->getType()->getTypeID() == Type::VectorTyID) { 1452 const Type *DstVecTy = DstTy->getScalarType(); 1453 unsigned size = Src.AggregateVal.size(); 1454 // the sizes of src and dst vectors must be equal 1455 Dest.AggregateVal.resize(size); 1456 1457 if (DstVecTy->getTypeID() == Type::FloatTyID) { 1458 assert(DstVecTy->isFloatingPointTy() && "Invalid SIToFP instruction"); 1459 for (unsigned i = 0; i < size; i++) 1460 Dest.AggregateVal[i].FloatVal = 1461 APIntOps::RoundSignedAPIntToFloat(Src.AggregateVal[i].IntVal); 1462 } else { 1463 for (unsigned i = 0; i < size; i++) 1464 Dest.AggregateVal[i].DoubleVal = 1465 APIntOps::RoundSignedAPIntToDouble(Src.AggregateVal[i].IntVal); 1466 } 1467 } else { 1468 // scalar 1469 assert(DstTy->isFloatingPointTy() && "Invalid SIToFP instruction"); 1470 1471 if (DstTy->getTypeID() == Type::FloatTyID) 1472 Dest.FloatVal = APIntOps::RoundSignedAPIntToFloat(Src.IntVal); 1473 else { 1474 Dest.DoubleVal = APIntOps::RoundSignedAPIntToDouble(Src.IntVal); 1475 } 1476 } 1477 1478 return Dest; 1479 } 1480 1481 GenericValue Interpreter::executePtrToIntInst(Value *SrcVal, Type *DstTy, 1482 ExecutionContext &SF) { 1483 uint32_t DBitWidth = cast<IntegerType>(DstTy)->getBitWidth(); 1484 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1485 assert(SrcVal->getType()->isPointerTy() && "Invalid PtrToInt instruction"); 1486 1487 Dest.IntVal = APInt(DBitWidth, (intptr_t) Src.PointerVal); 1488 return Dest; 1489 } 1490 1491 GenericValue Interpreter::executeIntToPtrInst(Value *SrcVal, Type *DstTy, 1492 ExecutionContext &SF) { 1493 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1494 assert(DstTy->isPointerTy() && "Invalid PtrToInt instruction"); 1495 1496 uint32_t PtrSize = TD.getPointerSizeInBits(); 1497 if (PtrSize != Src.IntVal.getBitWidth()) 1498 Src.IntVal = Src.IntVal.zextOrTrunc(PtrSize); 1499 1500 Dest.PointerVal = PointerTy(intptr_t(Src.IntVal.getZExtValue())); 1501 return Dest; 1502 } 1503 1504 GenericValue Interpreter::executeBitCastInst(Value *SrcVal, Type *DstTy, 1505 ExecutionContext &SF) { 1506 1507 // This instruction supports bitwise conversion of vectors to integers and 1508 // to vectors of other types (as long as they have the same size) 1509 Type *SrcTy = SrcVal->getType(); 1510 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1511 1512 if ((SrcTy->getTypeID() == Type::VectorTyID) || 1513 (DstTy->getTypeID() == Type::VectorTyID)) { 1514 // vector src bitcast to vector dst or vector src bitcast to scalar dst or 1515 // scalar src bitcast to vector dst 1516 bool isLittleEndian = TD.isLittleEndian(); 1517 GenericValue TempDst, TempSrc, SrcVec; 1518 const Type *SrcElemTy; 1519 const Type *DstElemTy; 1520 unsigned SrcBitSize; 1521 unsigned DstBitSize; 1522 unsigned SrcNum; 1523 unsigned DstNum; 1524 1525 if (SrcTy->getTypeID() == Type::VectorTyID) { 1526 SrcElemTy = SrcTy->getScalarType(); 1527 SrcBitSize = SrcTy->getScalarSizeInBits(); 1528 SrcNum = Src.AggregateVal.size(); 1529 SrcVec = Src; 1530 } else { 1531 // if src is scalar value, make it vector <1 x type> 1532 SrcElemTy = SrcTy; 1533 SrcBitSize = SrcTy->getPrimitiveSizeInBits(); 1534 SrcNum = 1; 1535 SrcVec.AggregateVal.push_back(Src); 1536 } 1537 1538 if (DstTy->getTypeID() == Type::VectorTyID) { 1539 DstElemTy = DstTy->getScalarType(); 1540 DstBitSize = DstTy->getScalarSizeInBits(); 1541 DstNum = (SrcNum * SrcBitSize) / DstBitSize; 1542 } else { 1543 DstElemTy = DstTy; 1544 DstBitSize = DstTy->getPrimitiveSizeInBits(); 1545 DstNum = 1; 1546 } 1547 1548 if (SrcNum * SrcBitSize != DstNum * DstBitSize) 1549 llvm_unreachable("Invalid BitCast"); 1550 1551 // If src is floating point, cast to integer first. 1552 TempSrc.AggregateVal.resize(SrcNum); 1553 if (SrcElemTy->isFloatTy()) { 1554 for (unsigned i = 0; i < SrcNum; i++) 1555 TempSrc.AggregateVal[i].IntVal = 1556 APInt::floatToBits(SrcVec.AggregateVal[i].FloatVal); 1557 1558 } else if (SrcElemTy->isDoubleTy()) { 1559 for (unsigned i = 0; i < SrcNum; i++) 1560 TempSrc.AggregateVal[i].IntVal = 1561 APInt::doubleToBits(SrcVec.AggregateVal[i].DoubleVal); 1562 } else if (SrcElemTy->isIntegerTy()) { 1563 for (unsigned i = 0; i < SrcNum; i++) 1564 TempSrc.AggregateVal[i].IntVal = SrcVec.AggregateVal[i].IntVal; 1565 } else { 1566 // Pointers are not allowed as the element type of vector. 1567 llvm_unreachable("Invalid Bitcast"); 1568 } 1569 1570 // now TempSrc is integer type vector 1571 if (DstNum < SrcNum) { 1572 // Example: bitcast <4 x i32> <i32 0, i32 1, i32 2, i32 3> to <2 x i64> 1573 unsigned Ratio = SrcNum / DstNum; 1574 unsigned SrcElt = 0; 1575 for (unsigned i = 0; i < DstNum; i++) { 1576 GenericValue Elt; 1577 Elt.IntVal = 0; 1578 Elt.IntVal = Elt.IntVal.zext(DstBitSize); 1579 unsigned ShiftAmt = isLittleEndian ? 0 : SrcBitSize * (Ratio - 1); 1580 for (unsigned j = 0; j < Ratio; j++) { 1581 APInt Tmp; 1582 Tmp = Tmp.zext(SrcBitSize); 1583 Tmp = TempSrc.AggregateVal[SrcElt++].IntVal; 1584 Tmp = Tmp.zext(DstBitSize); 1585 Tmp = Tmp.shl(ShiftAmt); 1586 ShiftAmt += isLittleEndian ? SrcBitSize : -SrcBitSize; 1587 Elt.IntVal |= Tmp; 1588 } 1589 TempDst.AggregateVal.push_back(Elt); 1590 } 1591 } else { 1592 // Example: bitcast <2 x i64> <i64 0, i64 1> to <4 x i32> 1593 unsigned Ratio = DstNum / SrcNum; 1594 for (unsigned i = 0; i < SrcNum; i++) { 1595 unsigned ShiftAmt = isLittleEndian ? 0 : DstBitSize * (Ratio - 1); 1596 for (unsigned j = 0; j < Ratio; j++) { 1597 GenericValue Elt; 1598 Elt.IntVal = Elt.IntVal.zext(SrcBitSize); 1599 Elt.IntVal = TempSrc.AggregateVal[i].IntVal; 1600 Elt.IntVal = Elt.IntVal.lshr(ShiftAmt); 1601 // it could be DstBitSize == SrcBitSize, so check it 1602 if (DstBitSize < SrcBitSize) 1603 Elt.IntVal = Elt.IntVal.trunc(DstBitSize); 1604 ShiftAmt += isLittleEndian ? DstBitSize : -DstBitSize; 1605 TempDst.AggregateVal.push_back(Elt); 1606 } 1607 } 1608 } 1609 1610 // convert result from integer to specified type 1611 if (DstTy->getTypeID() == Type::VectorTyID) { 1612 if (DstElemTy->isDoubleTy()) { 1613 Dest.AggregateVal.resize(DstNum); 1614 for (unsigned i = 0; i < DstNum; i++) 1615 Dest.AggregateVal[i].DoubleVal = 1616 TempDst.AggregateVal[i].IntVal.bitsToDouble(); 1617 } else if (DstElemTy->isFloatTy()) { 1618 Dest.AggregateVal.resize(DstNum); 1619 for (unsigned i = 0; i < DstNum; i++) 1620 Dest.AggregateVal[i].FloatVal = 1621 TempDst.AggregateVal[i].IntVal.bitsToFloat(); 1622 } else { 1623 Dest = TempDst; 1624 } 1625 } else { 1626 if (DstElemTy->isDoubleTy()) 1627 Dest.DoubleVal = TempDst.AggregateVal[0].IntVal.bitsToDouble(); 1628 else if (DstElemTy->isFloatTy()) { 1629 Dest.FloatVal = TempDst.AggregateVal[0].IntVal.bitsToFloat(); 1630 } else { 1631 Dest.IntVal = TempDst.AggregateVal[0].IntVal; 1632 } 1633 } 1634 } else { // if ((SrcTy->getTypeID() == Type::VectorTyID) || 1635 // (DstTy->getTypeID() == Type::VectorTyID)) 1636 1637 // scalar src bitcast to scalar dst 1638 if (DstTy->isPointerTy()) { 1639 assert(SrcTy->isPointerTy() && "Invalid BitCast"); 1640 Dest.PointerVal = Src.PointerVal; 1641 } else if (DstTy->isIntegerTy()) { 1642 if (SrcTy->isFloatTy()) 1643 Dest.IntVal = APInt::floatToBits(Src.FloatVal); 1644 else if (SrcTy->isDoubleTy()) { 1645 Dest.IntVal = APInt::doubleToBits(Src.DoubleVal); 1646 } else if (SrcTy->isIntegerTy()) { 1647 Dest.IntVal = Src.IntVal; 1648 } else { 1649 llvm_unreachable("Invalid BitCast"); 1650 } 1651 } else if (DstTy->isFloatTy()) { 1652 if (SrcTy->isIntegerTy()) 1653 Dest.FloatVal = Src.IntVal.bitsToFloat(); 1654 else { 1655 Dest.FloatVal = Src.FloatVal; 1656 } 1657 } else if (DstTy->isDoubleTy()) { 1658 if (SrcTy->isIntegerTy()) 1659 Dest.DoubleVal = Src.IntVal.bitsToDouble(); 1660 else { 1661 Dest.DoubleVal = Src.DoubleVal; 1662 } 1663 } else { 1664 llvm_unreachable("Invalid Bitcast"); 1665 } 1666 } 1667 1668 return Dest; 1669 } 1670 1671 void Interpreter::visitTruncInst(TruncInst &I) { 1672 ExecutionContext &SF = ECStack.back(); 1673 SetValue(&I, executeTruncInst(I.getOperand(0), I.getType(), SF), SF); 1674 } 1675 1676 void Interpreter::visitSExtInst(SExtInst &I) { 1677 ExecutionContext &SF = ECStack.back(); 1678 SetValue(&I, executeSExtInst(I.getOperand(0), I.getType(), SF), SF); 1679 } 1680 1681 void Interpreter::visitZExtInst(ZExtInst &I) { 1682 ExecutionContext &SF = ECStack.back(); 1683 SetValue(&I, executeZExtInst(I.getOperand(0), I.getType(), SF), SF); 1684 } 1685 1686 void Interpreter::visitFPTruncInst(FPTruncInst &I) { 1687 ExecutionContext &SF = ECStack.back(); 1688 SetValue(&I, executeFPTruncInst(I.getOperand(0), I.getType(), SF), SF); 1689 } 1690 1691 void Interpreter::visitFPExtInst(FPExtInst &I) { 1692 ExecutionContext &SF = ECStack.back(); 1693 SetValue(&I, executeFPExtInst(I.getOperand(0), I.getType(), SF), SF); 1694 } 1695 1696 void Interpreter::visitUIToFPInst(UIToFPInst &I) { 1697 ExecutionContext &SF = ECStack.back(); 1698 SetValue(&I, executeUIToFPInst(I.getOperand(0), I.getType(), SF), SF); 1699 } 1700 1701 void Interpreter::visitSIToFPInst(SIToFPInst &I) { 1702 ExecutionContext &SF = ECStack.back(); 1703 SetValue(&I, executeSIToFPInst(I.getOperand(0), I.getType(), SF), SF); 1704 } 1705 1706 void Interpreter::visitFPToUIInst(FPToUIInst &I) { 1707 ExecutionContext &SF = ECStack.back(); 1708 SetValue(&I, executeFPToUIInst(I.getOperand(0), I.getType(), SF), SF); 1709 } 1710 1711 void Interpreter::visitFPToSIInst(FPToSIInst &I) { 1712 ExecutionContext &SF = ECStack.back(); 1713 SetValue(&I, executeFPToSIInst(I.getOperand(0), I.getType(), SF), SF); 1714 } 1715 1716 void Interpreter::visitPtrToIntInst(PtrToIntInst &I) { 1717 ExecutionContext &SF = ECStack.back(); 1718 SetValue(&I, executePtrToIntInst(I.getOperand(0), I.getType(), SF), SF); 1719 } 1720 1721 void Interpreter::visitIntToPtrInst(IntToPtrInst &I) { 1722 ExecutionContext &SF = ECStack.back(); 1723 SetValue(&I, executeIntToPtrInst(I.getOperand(0), I.getType(), SF), SF); 1724 } 1725 1726 void Interpreter::visitBitCastInst(BitCastInst &I) { 1727 ExecutionContext &SF = ECStack.back(); 1728 SetValue(&I, executeBitCastInst(I.getOperand(0), I.getType(), SF), SF); 1729 } 1730 1731 #define IMPLEMENT_VAARG(TY) \ 1732 case Type::TY##TyID: Dest.TY##Val = Src.TY##Val; break 1733 1734 void Interpreter::visitVAArgInst(VAArgInst &I) { 1735 ExecutionContext &SF = ECStack.back(); 1736 1737 // Get the incoming valist parameter. LLI treats the valist as a 1738 // (ec-stack-depth var-arg-index) pair. 1739 GenericValue VAList = getOperandValue(I.getOperand(0), SF); 1740 GenericValue Dest; 1741 GenericValue Src = ECStack[VAList.UIntPairVal.first] 1742 .VarArgs[VAList.UIntPairVal.second]; 1743 Type *Ty = I.getType(); 1744 switch (Ty->getTypeID()) { 1745 case Type::IntegerTyID: 1746 Dest.IntVal = Src.IntVal; 1747 break; 1748 IMPLEMENT_VAARG(Pointer); 1749 IMPLEMENT_VAARG(Float); 1750 IMPLEMENT_VAARG(Double); 1751 default: 1752 dbgs() << "Unhandled dest type for vaarg instruction: " << *Ty << "\n"; 1753 llvm_unreachable(0); 1754 } 1755 1756 // Set the Value of this Instruction. 1757 SetValue(&I, Dest, SF); 1758 1759 // Move the pointer to the next vararg. 1760 ++VAList.UIntPairVal.second; 1761 } 1762 1763 void Interpreter::visitExtractElementInst(ExtractElementInst &I) { 1764 ExecutionContext &SF = ECStack.back(); 1765 GenericValue Src1 = getOperandValue(I.getOperand(0), SF); 1766 GenericValue Src2 = getOperandValue(I.getOperand(1), SF); 1767 GenericValue Dest; 1768 1769 Type *Ty = I.getType(); 1770 const unsigned indx = unsigned(Src2.IntVal.getZExtValue()); 1771 1772 if(Src1.AggregateVal.size() > indx) { 1773 switch (Ty->getTypeID()) { 1774 default: 1775 dbgs() << "Unhandled destination type for extractelement instruction: " 1776 << *Ty << "\n"; 1777 llvm_unreachable(0); 1778 break; 1779 case Type::IntegerTyID: 1780 Dest.IntVal = Src1.AggregateVal[indx].IntVal; 1781 break; 1782 case Type::FloatTyID: 1783 Dest.FloatVal = Src1.AggregateVal[indx].FloatVal; 1784 break; 1785 case Type::DoubleTyID: 1786 Dest.DoubleVal = Src1.AggregateVal[indx].DoubleVal; 1787 break; 1788 } 1789 } else { 1790 dbgs() << "Invalid index in extractelement instruction\n"; 1791 } 1792 1793 SetValue(&I, Dest, SF); 1794 } 1795 1796 GenericValue Interpreter::getConstantExprValue (ConstantExpr *CE, 1797 ExecutionContext &SF) { 1798 switch (CE->getOpcode()) { 1799 case Instruction::Trunc: 1800 return executeTruncInst(CE->getOperand(0), CE->getType(), SF); 1801 case Instruction::ZExt: 1802 return executeZExtInst(CE->getOperand(0), CE->getType(), SF); 1803 case Instruction::SExt: 1804 return executeSExtInst(CE->getOperand(0), CE->getType(), SF); 1805 case Instruction::FPTrunc: 1806 return executeFPTruncInst(CE->getOperand(0), CE->getType(), SF); 1807 case Instruction::FPExt: 1808 return executeFPExtInst(CE->getOperand(0), CE->getType(), SF); 1809 case Instruction::UIToFP: 1810 return executeUIToFPInst(CE->getOperand(0), CE->getType(), SF); 1811 case Instruction::SIToFP: 1812 return executeSIToFPInst(CE->getOperand(0), CE->getType(), SF); 1813 case Instruction::FPToUI: 1814 return executeFPToUIInst(CE->getOperand(0), CE->getType(), SF); 1815 case Instruction::FPToSI: 1816 return executeFPToSIInst(CE->getOperand(0), CE->getType(), SF); 1817 case Instruction::PtrToInt: 1818 return executePtrToIntInst(CE->getOperand(0), CE->getType(), SF); 1819 case Instruction::IntToPtr: 1820 return executeIntToPtrInst(CE->getOperand(0), CE->getType(), SF); 1821 case Instruction::BitCast: 1822 return executeBitCastInst(CE->getOperand(0), CE->getType(), SF); 1823 case Instruction::GetElementPtr: 1824 return executeGEPOperation(CE->getOperand(0), gep_type_begin(CE), 1825 gep_type_end(CE), SF); 1826 case Instruction::FCmp: 1827 case Instruction::ICmp: 1828 return executeCmpInst(CE->getPredicate(), 1829 getOperandValue(CE->getOperand(0), SF), 1830 getOperandValue(CE->getOperand(1), SF), 1831 CE->getOperand(0)->getType()); 1832 case Instruction::Select: 1833 return executeSelectInst(getOperandValue(CE->getOperand(0), SF), 1834 getOperandValue(CE->getOperand(1), SF), 1835 getOperandValue(CE->getOperand(2), SF)); 1836 default : 1837 break; 1838 } 1839 1840 // The cases below here require a GenericValue parameter for the result 1841 // so we initialize one, compute it and then return it. 1842 GenericValue Op0 = getOperandValue(CE->getOperand(0), SF); 1843 GenericValue Op1 = getOperandValue(CE->getOperand(1), SF); 1844 GenericValue Dest; 1845 Type * Ty = CE->getOperand(0)->getType(); 1846 switch (CE->getOpcode()) { 1847 case Instruction::Add: Dest.IntVal = Op0.IntVal + Op1.IntVal; break; 1848 case Instruction::Sub: Dest.IntVal = Op0.IntVal - Op1.IntVal; break; 1849 case Instruction::Mul: Dest.IntVal = Op0.IntVal * Op1.IntVal; break; 1850 case Instruction::FAdd: executeFAddInst(Dest, Op0, Op1, Ty); break; 1851 case Instruction::FSub: executeFSubInst(Dest, Op0, Op1, Ty); break; 1852 case Instruction::FMul: executeFMulInst(Dest, Op0, Op1, Ty); break; 1853 case Instruction::FDiv: executeFDivInst(Dest, Op0, Op1, Ty); break; 1854 case Instruction::FRem: executeFRemInst(Dest, Op0, Op1, Ty); break; 1855 case Instruction::SDiv: Dest.IntVal = Op0.IntVal.sdiv(Op1.IntVal); break; 1856 case Instruction::UDiv: Dest.IntVal = Op0.IntVal.udiv(Op1.IntVal); break; 1857 case Instruction::URem: Dest.IntVal = Op0.IntVal.urem(Op1.IntVal); break; 1858 case Instruction::SRem: Dest.IntVal = Op0.IntVal.srem(Op1.IntVal); break; 1859 case Instruction::And: Dest.IntVal = Op0.IntVal & Op1.IntVal; break; 1860 case Instruction::Or: Dest.IntVal = Op0.IntVal | Op1.IntVal; break; 1861 case Instruction::Xor: Dest.IntVal = Op0.IntVal ^ Op1.IntVal; break; 1862 case Instruction::Shl: 1863 Dest.IntVal = Op0.IntVal.shl(Op1.IntVal.getZExtValue()); 1864 break; 1865 case Instruction::LShr: 1866 Dest.IntVal = Op0.IntVal.lshr(Op1.IntVal.getZExtValue()); 1867 break; 1868 case Instruction::AShr: 1869 Dest.IntVal = Op0.IntVal.ashr(Op1.IntVal.getZExtValue()); 1870 break; 1871 default: 1872 dbgs() << "Unhandled ConstantExpr: " << *CE << "\n"; 1873 llvm_unreachable("Unhandled ConstantExpr"); 1874 } 1875 return Dest; 1876 } 1877 1878 GenericValue Interpreter::getOperandValue(Value *V, ExecutionContext &SF) { 1879 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) { 1880 return getConstantExprValue(CE, SF); 1881 } else if (Constant *CPV = dyn_cast<Constant>(V)) { 1882 return getConstantValue(CPV); 1883 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) { 1884 return PTOGV(getPointerToGlobal(GV)); 1885 } else { 1886 return SF.Values[V]; 1887 } 1888 } 1889 1890 //===----------------------------------------------------------------------===// 1891 // Dispatch and Execution Code 1892 //===----------------------------------------------------------------------===// 1893 1894 //===----------------------------------------------------------------------===// 1895 // callFunction - Execute the specified function... 1896 // 1897 void Interpreter::callFunction(Function *F, 1898 const std::vector<GenericValue> &ArgVals) { 1899 assert((ECStack.empty() || ECStack.back().Caller.getInstruction() == 0 || 1900 ECStack.back().Caller.arg_size() == ArgVals.size()) && 1901 "Incorrect number of arguments passed into function call!"); 1902 // Make a new stack frame... and fill it in. 1903 ECStack.push_back(ExecutionContext()); 1904 ExecutionContext &StackFrame = ECStack.back(); 1905 StackFrame.CurFunction = F; 1906 1907 // Special handling for external functions. 1908 if (F->isDeclaration()) { 1909 GenericValue Result = callExternalFunction (F, ArgVals); 1910 // Simulate a 'ret' instruction of the appropriate type. 1911 popStackAndReturnValueToCaller (F->getReturnType (), Result); 1912 return; 1913 } 1914 1915 // Get pointers to first LLVM BB & Instruction in function. 1916 StackFrame.CurBB = F->begin(); 1917 StackFrame.CurInst = StackFrame.CurBB->begin(); 1918 1919 // Run through the function arguments and initialize their values... 1920 assert((ArgVals.size() == F->arg_size() || 1921 (ArgVals.size() > F->arg_size() && F->getFunctionType()->isVarArg()))&& 1922 "Invalid number of values passed to function invocation!"); 1923 1924 // Handle non-varargs arguments... 1925 unsigned i = 0; 1926 for (Function::arg_iterator AI = F->arg_begin(), E = F->arg_end(); 1927 AI != E; ++AI, ++i) 1928 SetValue(AI, ArgVals[i], StackFrame); 1929 1930 // Handle varargs arguments... 1931 StackFrame.VarArgs.assign(ArgVals.begin()+i, ArgVals.end()); 1932 } 1933 1934 1935 void Interpreter::run() { 1936 while (!ECStack.empty()) { 1937 // Interpret a single instruction & increment the "PC". 1938 ExecutionContext &SF = ECStack.back(); // Current stack frame 1939 Instruction &I = *SF.CurInst++; // Increment before execute 1940 1941 // Track the number of dynamic instructions executed. 1942 ++NumDynamicInsts; 1943 1944 DEBUG(dbgs() << "About to interpret: " << I); 1945 visit(I); // Dispatch to one of the visit* methods... 1946 #if 0 1947 // This is not safe, as visiting the instruction could lower it and free I. 1948 DEBUG( 1949 if (!isa<CallInst>(I) && !isa<InvokeInst>(I) && 1950 I.getType() != Type::VoidTy) { 1951 dbgs() << " --> "; 1952 const GenericValue &Val = SF.Values[&I]; 1953 switch (I.getType()->getTypeID()) { 1954 default: llvm_unreachable("Invalid GenericValue Type"); 1955 case Type::VoidTyID: dbgs() << "void"; break; 1956 case Type::FloatTyID: dbgs() << "float " << Val.FloatVal; break; 1957 case Type::DoubleTyID: dbgs() << "double " << Val.DoubleVal; break; 1958 case Type::PointerTyID: dbgs() << "void* " << intptr_t(Val.PointerVal); 1959 break; 1960 case Type::IntegerTyID: 1961 dbgs() << "i" << Val.IntVal.getBitWidth() << " " 1962 << Val.IntVal.toStringUnsigned(10) 1963 << " (0x" << Val.IntVal.toStringUnsigned(16) << ")\n"; 1964 break; 1965 } 1966 }); 1967 #endif 1968 } 1969 } 1970