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> 29using namespace llvm; 30 31STATISTIC(NumDynamicInsts, "Number of dynamic instructions executed"); 32 33static 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 40static 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 53static 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 64static 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 75static 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 86static 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 97static 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 136static 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 150static 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 164static 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 178static 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 192static 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 206static 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 220static 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 234static 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 248static 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 262static 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 276void 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 323static 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 373static 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 399static 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 413static 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 427static 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 441static 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 476static 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 486static 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 495static 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 504static 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 513static 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 522static 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 531static 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 562static 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 593static 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 608void 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 643static 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 679void 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 788static GenericValue executeSelectInst(GenericValue Src1, GenericValue Src2, 789 GenericValue Src3) { 790 return Src1.IntVal == 0 ? Src3 : Src2; 791} 792 793void 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 807void 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/// 824void 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 850void 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 864void Interpreter::visitUnreachableInst(UnreachableInst &I) { 865 report_fatal_error("Program executed an 'unreachable' instruction!"); 866} 867 868void 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 881void 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 929void 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// 946void 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 978void 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// 1009GenericValue 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 1049void 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 1055void 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 1066void 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 1080void 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 1141void Interpreter::visitShl(BinaryOperator &I) { 1142 ExecutionContext &SF = ECStack.back(); 1143 GenericValue Src1 = getOperandValue(I.getOperand(0), SF); 1144 GenericValue Src2 = getOperandValue(I.getOperand(1), SF); 1145 GenericValue Dest; 1146 if (Src2.IntVal.getZExtValue() < Src1.IntVal.getBitWidth()) 1147 Dest.IntVal = Src1.IntVal.shl(Src2.IntVal.getZExtValue()); 1148 else 1149 Dest.IntVal = Src1.IntVal; 1150 1151 SetValue(&I, Dest, SF); 1152} 1153 1154void Interpreter::visitLShr(BinaryOperator &I) { 1155 ExecutionContext &SF = ECStack.back(); 1156 GenericValue Src1 = getOperandValue(I.getOperand(0), SF); 1157 GenericValue Src2 = getOperandValue(I.getOperand(1), SF); 1158 GenericValue Dest; 1159 if (Src2.IntVal.getZExtValue() < Src1.IntVal.getBitWidth()) 1160 Dest.IntVal = Src1.IntVal.lshr(Src2.IntVal.getZExtValue()); 1161 else 1162 Dest.IntVal = Src1.IntVal; 1163 1164 SetValue(&I, Dest, SF); 1165} 1166 1167void Interpreter::visitAShr(BinaryOperator &I) { 1168 ExecutionContext &SF = ECStack.back(); 1169 GenericValue Src1 = getOperandValue(I.getOperand(0), SF); 1170 GenericValue Src2 = getOperandValue(I.getOperand(1), SF); 1171 GenericValue Dest; 1172 if (Src2.IntVal.getZExtValue() < Src1.IntVal.getBitWidth()) 1173 Dest.IntVal = Src1.IntVal.ashr(Src2.IntVal.getZExtValue()); 1174 else 1175 Dest.IntVal = Src1.IntVal; 1176 1177 SetValue(&I, Dest, SF); 1178} 1179 1180GenericValue Interpreter::executeTruncInst(Value *SrcVal, Type *DstTy, 1181 ExecutionContext &SF) { 1182 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1183 IntegerType *DITy = cast<IntegerType>(DstTy); 1184 unsigned DBitWidth = DITy->getBitWidth(); 1185 Dest.IntVal = Src.IntVal.trunc(DBitWidth); 1186 return Dest; 1187} 1188 1189GenericValue Interpreter::executeSExtInst(Value *SrcVal, Type *DstTy, 1190 ExecutionContext &SF) { 1191 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1192 IntegerType *DITy = cast<IntegerType>(DstTy); 1193 unsigned DBitWidth = DITy->getBitWidth(); 1194 Dest.IntVal = Src.IntVal.sext(DBitWidth); 1195 return Dest; 1196} 1197 1198GenericValue Interpreter::executeZExtInst(Value *SrcVal, Type *DstTy, 1199 ExecutionContext &SF) { 1200 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1201 IntegerType *DITy = cast<IntegerType>(DstTy); 1202 unsigned DBitWidth = DITy->getBitWidth(); 1203 Dest.IntVal = Src.IntVal.zext(DBitWidth); 1204 return Dest; 1205} 1206 1207GenericValue Interpreter::executeFPTruncInst(Value *SrcVal, Type *DstTy, 1208 ExecutionContext &SF) { 1209 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1210 assert(SrcVal->getType()->isDoubleTy() && DstTy->isFloatTy() && 1211 "Invalid FPTrunc instruction"); 1212 Dest.FloatVal = (float) Src.DoubleVal; 1213 return Dest; 1214} 1215 1216GenericValue Interpreter::executeFPExtInst(Value *SrcVal, Type *DstTy, 1217 ExecutionContext &SF) { 1218 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1219 assert(SrcVal->getType()->isFloatTy() && DstTy->isDoubleTy() && 1220 "Invalid FPTrunc instruction"); 1221 Dest.DoubleVal = (double) Src.FloatVal; 1222 return Dest; 1223} 1224 1225GenericValue Interpreter::executeFPToUIInst(Value *SrcVal, Type *DstTy, 1226 ExecutionContext &SF) { 1227 Type *SrcTy = SrcVal->getType(); 1228 uint32_t DBitWidth = cast<IntegerType>(DstTy)->getBitWidth(); 1229 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1230 assert(SrcTy->isFloatingPointTy() && "Invalid FPToUI instruction"); 1231 1232 if (SrcTy->getTypeID() == Type::FloatTyID) 1233 Dest.IntVal = APIntOps::RoundFloatToAPInt(Src.FloatVal, DBitWidth); 1234 else 1235 Dest.IntVal = APIntOps::RoundDoubleToAPInt(Src.DoubleVal, DBitWidth); 1236 return Dest; 1237} 1238 1239GenericValue Interpreter::executeFPToSIInst(Value *SrcVal, Type *DstTy, 1240 ExecutionContext &SF) { 1241 Type *SrcTy = SrcVal->getType(); 1242 uint32_t DBitWidth = cast<IntegerType>(DstTy)->getBitWidth(); 1243 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1244 assert(SrcTy->isFloatingPointTy() && "Invalid FPToSI instruction"); 1245 1246 if (SrcTy->getTypeID() == Type::FloatTyID) 1247 Dest.IntVal = APIntOps::RoundFloatToAPInt(Src.FloatVal, DBitWidth); 1248 else 1249 Dest.IntVal = APIntOps::RoundDoubleToAPInt(Src.DoubleVal, DBitWidth); 1250 return Dest; 1251} 1252 1253GenericValue Interpreter::executeUIToFPInst(Value *SrcVal, Type *DstTy, 1254 ExecutionContext &SF) { 1255 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1256 assert(DstTy->isFloatingPointTy() && "Invalid UIToFP instruction"); 1257 1258 if (DstTy->getTypeID() == Type::FloatTyID) 1259 Dest.FloatVal = APIntOps::RoundAPIntToFloat(Src.IntVal); 1260 else 1261 Dest.DoubleVal = APIntOps::RoundAPIntToDouble(Src.IntVal); 1262 return Dest; 1263} 1264 1265GenericValue Interpreter::executeSIToFPInst(Value *SrcVal, Type *DstTy, 1266 ExecutionContext &SF) { 1267 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1268 assert(DstTy->isFloatingPointTy() && "Invalid SIToFP instruction"); 1269 1270 if (DstTy->getTypeID() == Type::FloatTyID) 1271 Dest.FloatVal = APIntOps::RoundSignedAPIntToFloat(Src.IntVal); 1272 else 1273 Dest.DoubleVal = APIntOps::RoundSignedAPIntToDouble(Src.IntVal); 1274 return Dest; 1275 1276} 1277 1278GenericValue Interpreter::executePtrToIntInst(Value *SrcVal, Type *DstTy, 1279 ExecutionContext &SF) { 1280 uint32_t DBitWidth = cast<IntegerType>(DstTy)->getBitWidth(); 1281 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1282 assert(SrcVal->getType()->isPointerTy() && "Invalid PtrToInt instruction"); 1283 1284 Dest.IntVal = APInt(DBitWidth, (intptr_t) Src.PointerVal); 1285 return Dest; 1286} 1287 1288GenericValue Interpreter::executeIntToPtrInst(Value *SrcVal, Type *DstTy, 1289 ExecutionContext &SF) { 1290 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1291 assert(DstTy->isPointerTy() && "Invalid PtrToInt instruction"); 1292 1293 uint32_t PtrSize = TD.getPointerSizeInBits(); 1294 if (PtrSize != Src.IntVal.getBitWidth()) 1295 Src.IntVal = Src.IntVal.zextOrTrunc(PtrSize); 1296 1297 Dest.PointerVal = PointerTy(intptr_t(Src.IntVal.getZExtValue())); 1298 return Dest; 1299} 1300 1301GenericValue Interpreter::executeBitCastInst(Value *SrcVal, Type *DstTy, 1302 ExecutionContext &SF) { 1303 1304 Type *SrcTy = SrcVal->getType(); 1305 GenericValue Dest, Src = getOperandValue(SrcVal, SF); 1306 if (DstTy->isPointerTy()) { 1307 assert(SrcTy->isPointerTy() && "Invalid BitCast"); 1308 Dest.PointerVal = Src.PointerVal; 1309 } else if (DstTy->isIntegerTy()) { 1310 if (SrcTy->isFloatTy()) { 1311 Dest.IntVal = APInt::floatToBits(Src.FloatVal); 1312 } else if (SrcTy->isDoubleTy()) { 1313 Dest.IntVal = APInt::doubleToBits(Src.DoubleVal); 1314 } else if (SrcTy->isIntegerTy()) { 1315 Dest.IntVal = Src.IntVal; 1316 } else 1317 llvm_unreachable("Invalid BitCast"); 1318 } else if (DstTy->isFloatTy()) { 1319 if (SrcTy->isIntegerTy()) 1320 Dest.FloatVal = Src.IntVal.bitsToFloat(); 1321 else 1322 Dest.FloatVal = Src.FloatVal; 1323 } else if (DstTy->isDoubleTy()) { 1324 if (SrcTy->isIntegerTy()) 1325 Dest.DoubleVal = Src.IntVal.bitsToDouble(); 1326 else 1327 Dest.DoubleVal = Src.DoubleVal; 1328 } else 1329 llvm_unreachable("Invalid Bitcast"); 1330 1331 return Dest; 1332} 1333 1334void Interpreter::visitTruncInst(TruncInst &I) { 1335 ExecutionContext &SF = ECStack.back(); 1336 SetValue(&I, executeTruncInst(I.getOperand(0), I.getType(), SF), SF); 1337} 1338 1339void Interpreter::visitSExtInst(SExtInst &I) { 1340 ExecutionContext &SF = ECStack.back(); 1341 SetValue(&I, executeSExtInst(I.getOperand(0), I.getType(), SF), SF); 1342} 1343 1344void Interpreter::visitZExtInst(ZExtInst &I) { 1345 ExecutionContext &SF = ECStack.back(); 1346 SetValue(&I, executeZExtInst(I.getOperand(0), I.getType(), SF), SF); 1347} 1348 1349void Interpreter::visitFPTruncInst(FPTruncInst &I) { 1350 ExecutionContext &SF = ECStack.back(); 1351 SetValue(&I, executeFPTruncInst(I.getOperand(0), I.getType(), SF), SF); 1352} 1353 1354void Interpreter::visitFPExtInst(FPExtInst &I) { 1355 ExecutionContext &SF = ECStack.back(); 1356 SetValue(&I, executeFPExtInst(I.getOperand(0), I.getType(), SF), SF); 1357} 1358 1359void Interpreter::visitUIToFPInst(UIToFPInst &I) { 1360 ExecutionContext &SF = ECStack.back(); 1361 SetValue(&I, executeUIToFPInst(I.getOperand(0), I.getType(), SF), SF); 1362} 1363 1364void Interpreter::visitSIToFPInst(SIToFPInst &I) { 1365 ExecutionContext &SF = ECStack.back(); 1366 SetValue(&I, executeSIToFPInst(I.getOperand(0), I.getType(), SF), SF); 1367} 1368 1369void Interpreter::visitFPToUIInst(FPToUIInst &I) { 1370 ExecutionContext &SF = ECStack.back(); 1371 SetValue(&I, executeFPToUIInst(I.getOperand(0), I.getType(), SF), SF); 1372} 1373 1374void Interpreter::visitFPToSIInst(FPToSIInst &I) { 1375 ExecutionContext &SF = ECStack.back(); 1376 SetValue(&I, executeFPToSIInst(I.getOperand(0), I.getType(), SF), SF); 1377} 1378 1379void Interpreter::visitPtrToIntInst(PtrToIntInst &I) { 1380 ExecutionContext &SF = ECStack.back(); 1381 SetValue(&I, executePtrToIntInst(I.getOperand(0), I.getType(), SF), SF); 1382} 1383 1384void Interpreter::visitIntToPtrInst(IntToPtrInst &I) { 1385 ExecutionContext &SF = ECStack.back(); 1386 SetValue(&I, executeIntToPtrInst(I.getOperand(0), I.getType(), SF), SF); 1387} 1388 1389void Interpreter::visitBitCastInst(BitCastInst &I) { 1390 ExecutionContext &SF = ECStack.back(); 1391 SetValue(&I, executeBitCastInst(I.getOperand(0), I.getType(), SF), SF); 1392} 1393 1394#define IMPLEMENT_VAARG(TY) \ 1395 case Type::TY##TyID: Dest.TY##Val = Src.TY##Val; break 1396 1397void Interpreter::visitVAArgInst(VAArgInst &I) { 1398 ExecutionContext &SF = ECStack.back(); 1399 1400 // Get the incoming valist parameter. LLI treats the valist as a 1401 // (ec-stack-depth var-arg-index) pair. 1402 GenericValue VAList = getOperandValue(I.getOperand(0), SF); 1403 GenericValue Dest; 1404 GenericValue Src = ECStack[VAList.UIntPairVal.first] 1405 .VarArgs[VAList.UIntPairVal.second]; 1406 Type *Ty = I.getType(); 1407 switch (Ty->getTypeID()) { 1408 case Type::IntegerTyID: 1409 Dest.IntVal = Src.IntVal; 1410 break; 1411 IMPLEMENT_VAARG(Pointer); 1412 IMPLEMENT_VAARG(Float); 1413 IMPLEMENT_VAARG(Double); 1414 default: 1415 dbgs() << "Unhandled dest type for vaarg instruction: " << *Ty << "\n"; 1416 llvm_unreachable(0); 1417 } 1418 1419 // Set the Value of this Instruction. 1420 SetValue(&I, Dest, SF); 1421 1422 // Move the pointer to the next vararg. 1423 ++VAList.UIntPairVal.second; 1424} 1425 1426void Interpreter::visitExtractElementInst(ExtractElementInst &I) { 1427 ExecutionContext &SF = ECStack.back(); 1428 GenericValue Src1 = getOperandValue(I.getOperand(0), SF); 1429 GenericValue Src2 = getOperandValue(I.getOperand(1), SF); 1430 GenericValue Dest; 1431 1432 Type *Ty = I.getType(); 1433 const unsigned indx = unsigned(Src2.IntVal.getZExtValue()); 1434 1435 if(Src1.AggregateVal.size() > indx) { 1436 switch (Ty->getTypeID()) { 1437 default: 1438 dbgs() << "Unhandled destination type for extractelement instruction: " 1439 << *Ty << "\n"; 1440 llvm_unreachable(0); 1441 break; 1442 case Type::IntegerTyID: 1443 Dest.IntVal = Src1.AggregateVal[indx].IntVal; 1444 break; 1445 case Type::FloatTyID: 1446 Dest.FloatVal = Src1.AggregateVal[indx].FloatVal; 1447 break; 1448 case Type::DoubleTyID: 1449 Dest.DoubleVal = Src1.AggregateVal[indx].DoubleVal; 1450 break; 1451 } 1452 } else { 1453 dbgs() << "Invalid index in extractelement instruction\n"; 1454 } 1455 1456 SetValue(&I, Dest, SF); 1457} 1458 1459GenericValue Interpreter::getConstantExprValue (ConstantExpr *CE, 1460 ExecutionContext &SF) { 1461 switch (CE->getOpcode()) { 1462 case Instruction::Trunc: 1463 return executeTruncInst(CE->getOperand(0), CE->getType(), SF); 1464 case Instruction::ZExt: 1465 return executeZExtInst(CE->getOperand(0), CE->getType(), SF); 1466 case Instruction::SExt: 1467 return executeSExtInst(CE->getOperand(0), CE->getType(), SF); 1468 case Instruction::FPTrunc: 1469 return executeFPTruncInst(CE->getOperand(0), CE->getType(), SF); 1470 case Instruction::FPExt: 1471 return executeFPExtInst(CE->getOperand(0), CE->getType(), SF); 1472 case Instruction::UIToFP: 1473 return executeUIToFPInst(CE->getOperand(0), CE->getType(), SF); 1474 case Instruction::SIToFP: 1475 return executeSIToFPInst(CE->getOperand(0), CE->getType(), SF); 1476 case Instruction::FPToUI: 1477 return executeFPToUIInst(CE->getOperand(0), CE->getType(), SF); 1478 case Instruction::FPToSI: 1479 return executeFPToSIInst(CE->getOperand(0), CE->getType(), SF); 1480 case Instruction::PtrToInt: 1481 return executePtrToIntInst(CE->getOperand(0), CE->getType(), SF); 1482 case Instruction::IntToPtr: 1483 return executeIntToPtrInst(CE->getOperand(0), CE->getType(), SF); 1484 case Instruction::BitCast: 1485 return executeBitCastInst(CE->getOperand(0), CE->getType(), SF); 1486 case Instruction::GetElementPtr: 1487 return executeGEPOperation(CE->getOperand(0), gep_type_begin(CE), 1488 gep_type_end(CE), SF); 1489 case Instruction::FCmp: 1490 case Instruction::ICmp: 1491 return executeCmpInst(CE->getPredicate(), 1492 getOperandValue(CE->getOperand(0), SF), 1493 getOperandValue(CE->getOperand(1), SF), 1494 CE->getOperand(0)->getType()); 1495 case Instruction::Select: 1496 return executeSelectInst(getOperandValue(CE->getOperand(0), SF), 1497 getOperandValue(CE->getOperand(1), SF), 1498 getOperandValue(CE->getOperand(2), SF)); 1499 default : 1500 break; 1501 } 1502 1503 // The cases below here require a GenericValue parameter for the result 1504 // so we initialize one, compute it and then return it. 1505 GenericValue Op0 = getOperandValue(CE->getOperand(0), SF); 1506 GenericValue Op1 = getOperandValue(CE->getOperand(1), SF); 1507 GenericValue Dest; 1508 Type * Ty = CE->getOperand(0)->getType(); 1509 switch (CE->getOpcode()) { 1510 case Instruction::Add: Dest.IntVal = Op0.IntVal + Op1.IntVal; break; 1511 case Instruction::Sub: Dest.IntVal = Op0.IntVal - Op1.IntVal; break; 1512 case Instruction::Mul: Dest.IntVal = Op0.IntVal * Op1.IntVal; break; 1513 case Instruction::FAdd: executeFAddInst(Dest, Op0, Op1, Ty); break; 1514 case Instruction::FSub: executeFSubInst(Dest, Op0, Op1, Ty); break; 1515 case Instruction::FMul: executeFMulInst(Dest, Op0, Op1, Ty); break; 1516 case Instruction::FDiv: executeFDivInst(Dest, Op0, Op1, Ty); break; 1517 case Instruction::FRem: executeFRemInst(Dest, Op0, Op1, Ty); break; 1518 case Instruction::SDiv: Dest.IntVal = Op0.IntVal.sdiv(Op1.IntVal); break; 1519 case Instruction::UDiv: Dest.IntVal = Op0.IntVal.udiv(Op1.IntVal); break; 1520 case Instruction::URem: Dest.IntVal = Op0.IntVal.urem(Op1.IntVal); break; 1521 case Instruction::SRem: Dest.IntVal = Op0.IntVal.srem(Op1.IntVal); break; 1522 case Instruction::And: Dest.IntVal = Op0.IntVal & Op1.IntVal; break; 1523 case Instruction::Or: Dest.IntVal = Op0.IntVal | Op1.IntVal; break; 1524 case Instruction::Xor: Dest.IntVal = Op0.IntVal ^ Op1.IntVal; break; 1525 case Instruction::Shl: 1526 Dest.IntVal = Op0.IntVal.shl(Op1.IntVal.getZExtValue()); 1527 break; 1528 case Instruction::LShr: 1529 Dest.IntVal = Op0.IntVal.lshr(Op1.IntVal.getZExtValue()); 1530 break; 1531 case Instruction::AShr: 1532 Dest.IntVal = Op0.IntVal.ashr(Op1.IntVal.getZExtValue()); 1533 break; 1534 default: 1535 dbgs() << "Unhandled ConstantExpr: " << *CE << "\n"; 1536 llvm_unreachable("Unhandled ConstantExpr"); 1537 } 1538 return Dest; 1539} 1540 1541GenericValue Interpreter::getOperandValue(Value *V, ExecutionContext &SF) { 1542 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) { 1543 return getConstantExprValue(CE, SF); 1544 } else if (Constant *CPV = dyn_cast<Constant>(V)) { 1545 return getConstantValue(CPV); 1546 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) { 1547 return PTOGV(getPointerToGlobal(GV)); 1548 } else { 1549 return SF.Values[V]; 1550 } 1551} 1552 1553//===----------------------------------------------------------------------===// 1554// Dispatch and Execution Code 1555//===----------------------------------------------------------------------===// 1556 1557//===----------------------------------------------------------------------===// 1558// callFunction - Execute the specified function... 1559// 1560void Interpreter::callFunction(Function *F, 1561 const std::vector<GenericValue> &ArgVals) { 1562 assert((ECStack.empty() || ECStack.back().Caller.getInstruction() == 0 || 1563 ECStack.back().Caller.arg_size() == ArgVals.size()) && 1564 "Incorrect number of arguments passed into function call!"); 1565 // Make a new stack frame... and fill it in. 1566 ECStack.push_back(ExecutionContext()); 1567 ExecutionContext &StackFrame = ECStack.back(); 1568 StackFrame.CurFunction = F; 1569 1570 // Special handling for external functions. 1571 if (F->isDeclaration()) { 1572 GenericValue Result = callExternalFunction (F, ArgVals); 1573 // Simulate a 'ret' instruction of the appropriate type. 1574 popStackAndReturnValueToCaller (F->getReturnType (), Result); 1575 return; 1576 } 1577 1578 // Get pointers to first LLVM BB & Instruction in function. 1579 StackFrame.CurBB = F->begin(); 1580 StackFrame.CurInst = StackFrame.CurBB->begin(); 1581 1582 // Run through the function arguments and initialize their values... 1583 assert((ArgVals.size() == F->arg_size() || 1584 (ArgVals.size() > F->arg_size() && F->getFunctionType()->isVarArg()))&& 1585 "Invalid number of values passed to function invocation!"); 1586 1587 // Handle non-varargs arguments... 1588 unsigned i = 0; 1589 for (Function::arg_iterator AI = F->arg_begin(), E = F->arg_end(); 1590 AI != E; ++AI, ++i) 1591 SetValue(AI, ArgVals[i], StackFrame); 1592 1593 // Handle varargs arguments... 1594 StackFrame.VarArgs.assign(ArgVals.begin()+i, ArgVals.end()); 1595} 1596 1597 1598void Interpreter::run() { 1599 while (!ECStack.empty()) { 1600 // Interpret a single instruction & increment the "PC". 1601 ExecutionContext &SF = ECStack.back(); // Current stack frame 1602 Instruction &I = *SF.CurInst++; // Increment before execute 1603 1604 // Track the number of dynamic instructions executed. 1605 ++NumDynamicInsts; 1606 1607 DEBUG(dbgs() << "About to interpret: " << I); 1608 visit(I); // Dispatch to one of the visit* methods... 1609#if 0 1610 // This is not safe, as visiting the instruction could lower it and free I. 1611DEBUG( 1612 if (!isa<CallInst>(I) && !isa<InvokeInst>(I) && 1613 I.getType() != Type::VoidTy) { 1614 dbgs() << " --> "; 1615 const GenericValue &Val = SF.Values[&I]; 1616 switch (I.getType()->getTypeID()) { 1617 default: llvm_unreachable("Invalid GenericValue Type"); 1618 case Type::VoidTyID: dbgs() << "void"; break; 1619 case Type::FloatTyID: dbgs() << "float " << Val.FloatVal; break; 1620 case Type::DoubleTyID: dbgs() << "double " << Val.DoubleVal; break; 1621 case Type::PointerTyID: dbgs() << "void* " << intptr_t(Val.PointerVal); 1622 break; 1623 case Type::IntegerTyID: 1624 dbgs() << "i" << Val.IntVal.getBitWidth() << " " 1625 << Val.IntVal.toStringUnsigned(10) 1626 << " (0x" << Val.IntVal.toStringUnsigned(16) << ")\n"; 1627 break; 1628 } 1629 }); 1630#endif 1631 } 1632} 1633