BitcodeReader.cpp revision c9c55a9d2fc63ee87cf00e80736f6508507f2444
1//===- BitcodeReader.cpp - Internal BitcodeReader implementation ----------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file was developed by Chris Lattner and is distributed under 6// the University of Illinois Open Source License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This header defines the BitcodeReader class. 11// 12//===----------------------------------------------------------------------===// 13 14#include "llvm/Bitcode/ReaderWriter.h" 15#include "BitcodeReader.h" 16#include "llvm/Constants.h" 17#include "llvm/DerivedTypes.h" 18#include "llvm/Instructions.h" 19#include "llvm/Module.h" 20#include "llvm/ADT/SmallString.h" 21#include "llvm/Support/MathExtras.h" 22#include "llvm/Support/MemoryBuffer.h" 23using namespace llvm; 24 25BitcodeReader::~BitcodeReader() { 26 delete Buffer; 27} 28 29 30/// ConvertToString - Convert a string from a record into an std::string, return 31/// true on failure. 32template<typename StrTy> 33static bool ConvertToString(SmallVector<uint64_t, 64> &Record, unsigned Idx, 34 StrTy &Result) { 35 if (Record.size() < Idx+1 || Record.size() < Record[Idx]+Idx+1) 36 return true; 37 38 for (unsigned i = 0, e = Record[Idx]; i != e; ++i) 39 Result += (char)Record[Idx+i+1]; 40 return false; 41} 42 43static GlobalValue::LinkageTypes GetDecodedLinkage(unsigned Val) { 44 switch (Val) { 45 default: // Map unknown/new linkages to external 46 case 0: return GlobalValue::ExternalLinkage; 47 case 1: return GlobalValue::WeakLinkage; 48 case 2: return GlobalValue::AppendingLinkage; 49 case 3: return GlobalValue::InternalLinkage; 50 case 4: return GlobalValue::LinkOnceLinkage; 51 case 5: return GlobalValue::DLLImportLinkage; 52 case 6: return GlobalValue::DLLExportLinkage; 53 case 7: return GlobalValue::ExternalWeakLinkage; 54 } 55} 56 57static GlobalValue::VisibilityTypes GetDecodedVisibility(unsigned Val) { 58 switch (Val) { 59 default: // Map unknown visibilities to default. 60 case 0: return GlobalValue::DefaultVisibility; 61 case 1: return GlobalValue::HiddenVisibility; 62 case 2: return GlobalValue::ProtectedVisibility; 63 } 64} 65 66static int GetDecodedCastOpcode(unsigned Val) { 67 switch (Val) { 68 default: return -1; 69 case bitc::CAST_TRUNC : return Instruction::Trunc; 70 case bitc::CAST_ZEXT : return Instruction::ZExt; 71 case bitc::CAST_SEXT : return Instruction::SExt; 72 case bitc::CAST_FPTOUI : return Instruction::FPToUI; 73 case bitc::CAST_FPTOSI : return Instruction::FPToSI; 74 case bitc::CAST_UITOFP : return Instruction::UIToFP; 75 case bitc::CAST_SITOFP : return Instruction::SIToFP; 76 case bitc::CAST_FPTRUNC : return Instruction::FPTrunc; 77 case bitc::CAST_FPEXT : return Instruction::FPExt; 78 case bitc::CAST_PTRTOINT: return Instruction::PtrToInt; 79 case bitc::CAST_INTTOPTR: return Instruction::IntToPtr; 80 case bitc::CAST_BITCAST : return Instruction::BitCast; 81 } 82} 83static int GetDecodedBinaryOpcode(unsigned Val, const Type *Ty) { 84 switch (Val) { 85 default: return -1; 86 case bitc::BINOP_ADD: return Instruction::Add; 87 case bitc::BINOP_SUB: return Instruction::Sub; 88 case bitc::BINOP_MUL: return Instruction::Mul; 89 case bitc::BINOP_UDIV: return Instruction::UDiv; 90 case bitc::BINOP_SDIV: 91 return Ty->isFPOrFPVector() ? Instruction::FDiv : Instruction::SDiv; 92 case bitc::BINOP_UREM: return Instruction::URem; 93 case bitc::BINOP_SREM: 94 return Ty->isFPOrFPVector() ? Instruction::FRem : Instruction::SRem; 95 case bitc::BINOP_SHL: return Instruction::Shl; 96 case bitc::BINOP_LSHR: return Instruction::LShr; 97 case bitc::BINOP_ASHR: return Instruction::AShr; 98 case bitc::BINOP_AND: return Instruction::And; 99 case bitc::BINOP_OR: return Instruction::Or; 100 case bitc::BINOP_XOR: return Instruction::Xor; 101 } 102} 103 104 105namespace { 106 /// @brief A class for maintaining the slot number definition 107 /// as a placeholder for the actual definition for forward constants defs. 108 class ConstantPlaceHolder : public ConstantExpr { 109 ConstantPlaceHolder(); // DO NOT IMPLEMENT 110 void operator=(const ConstantPlaceHolder &); // DO NOT IMPLEMENT 111 public: 112 Use Op; 113 ConstantPlaceHolder(const Type *Ty) 114 : ConstantExpr(Ty, Instruction::UserOp1, &Op, 1), 115 Op(UndefValue::get(Type::Int32Ty), this) { 116 } 117 }; 118} 119 120Constant *BitcodeReaderValueList::getConstantFwdRef(unsigned Idx, 121 const Type *Ty) { 122 if (Idx >= size()) { 123 // Insert a bunch of null values. 124 Uses.resize(Idx+1); 125 OperandList = &Uses[0]; 126 NumOperands = Idx+1; 127 } 128 129 if (Value *V = Uses[Idx]) { 130 assert(Ty == V->getType() && "Type mismatch in constant table!"); 131 return cast<Constant>(V); 132 } 133 134 // Create and return a placeholder, which will later be RAUW'd. 135 Constant *C = new ConstantPlaceHolder(Ty); 136 Uses[Idx].init(C, this); 137 return C; 138} 139 140Value *BitcodeReaderValueList::getValueFwdRef(unsigned Idx, const Type *Ty) { 141 if (Idx >= size()) { 142 // Insert a bunch of null values. 143 Uses.resize(Idx+1); 144 OperandList = &Uses[0]; 145 NumOperands = Idx+1; 146 } 147 148 if (Value *V = Uses[Idx]) { 149 assert((Ty == 0 || Ty == V->getType()) && "Type mismatch in value table!"); 150 return V; 151 } 152 153 // No type specified, must be invalid reference. 154 if (Ty == 0) return 0; 155 156 // Create and return a placeholder, which will later be RAUW'd. 157 Value *V = new Argument(Ty); 158 Uses[Idx].init(V, this); 159 return V; 160} 161 162 163const Type *BitcodeReader::getTypeByID(unsigned ID, bool isTypeTable) { 164 // If the TypeID is in range, return it. 165 if (ID < TypeList.size()) 166 return TypeList[ID].get(); 167 if (!isTypeTable) return 0; 168 169 // The type table allows forward references. Push as many Opaque types as 170 // needed to get up to ID. 171 while (TypeList.size() <= ID) 172 TypeList.push_back(OpaqueType::get()); 173 return TypeList.back().get(); 174} 175 176bool BitcodeReader::ParseTypeTable() { 177 if (Stream.EnterSubBlock()) 178 return Error("Malformed block record"); 179 180 if (!TypeList.empty()) 181 return Error("Multiple TYPE_BLOCKs found!"); 182 183 SmallVector<uint64_t, 64> Record; 184 unsigned NumRecords = 0; 185 186 // Read all the records for this type table. 187 while (1) { 188 unsigned Code = Stream.ReadCode(); 189 if (Code == bitc::END_BLOCK) { 190 if (NumRecords != TypeList.size()) 191 return Error("Invalid type forward reference in TYPE_BLOCK"); 192 if (Stream.ReadBlockEnd()) 193 return Error("Error at end of type table block"); 194 return false; 195 } 196 197 if (Code == bitc::ENTER_SUBBLOCK) { 198 // No known subblocks, always skip them. 199 Stream.ReadSubBlockID(); 200 if (Stream.SkipBlock()) 201 return Error("Malformed block record"); 202 continue; 203 } 204 205 if (Code == bitc::DEFINE_ABBREV) { 206 Stream.ReadAbbrevRecord(); 207 continue; 208 } 209 210 // Read a record. 211 Record.clear(); 212 const Type *ResultTy = 0; 213 switch (Stream.ReadRecord(Code, Record)) { 214 default: // Default behavior: unknown type. 215 ResultTy = 0; 216 break; 217 case bitc::TYPE_CODE_NUMENTRY: // TYPE_CODE_NUMENTRY: [numentries] 218 // TYPE_CODE_NUMENTRY contains a count of the number of types in the 219 // type list. This allows us to reserve space. 220 if (Record.size() < 1) 221 return Error("Invalid TYPE_CODE_NUMENTRY record"); 222 TypeList.reserve(Record[0]); 223 continue; 224 case bitc::TYPE_CODE_META: // TYPE_CODE_META: [metacode]... 225 // No metadata supported yet. 226 if (Record.size() < 1) 227 return Error("Invalid TYPE_CODE_META record"); 228 continue; 229 230 case bitc::TYPE_CODE_VOID: // VOID 231 ResultTy = Type::VoidTy; 232 break; 233 case bitc::TYPE_CODE_FLOAT: // FLOAT 234 ResultTy = Type::FloatTy; 235 break; 236 case bitc::TYPE_CODE_DOUBLE: // DOUBLE 237 ResultTy = Type::DoubleTy; 238 break; 239 case bitc::TYPE_CODE_LABEL: // LABEL 240 ResultTy = Type::LabelTy; 241 break; 242 case bitc::TYPE_CODE_OPAQUE: // OPAQUE 243 ResultTy = 0; 244 break; 245 case bitc::TYPE_CODE_INTEGER: // INTEGER: [width] 246 if (Record.size() < 1) 247 return Error("Invalid Integer type record"); 248 249 ResultTy = IntegerType::get(Record[0]); 250 break; 251 case bitc::TYPE_CODE_POINTER: // POINTER: [pointee type] 252 if (Record.size() < 1) 253 return Error("Invalid POINTER type record"); 254 ResultTy = PointerType::get(getTypeByID(Record[0], true)); 255 break; 256 case bitc::TYPE_CODE_FUNCTION: { 257 // FUNCTION: [vararg, retty, #pararms, paramty N] 258 if (Record.size() < 3 || Record.size() < Record[2]+3) 259 return Error("Invalid FUNCTION type record"); 260 std::vector<const Type*> ArgTys; 261 for (unsigned i = 0, e = Record[2]; i != e; ++i) 262 ArgTys.push_back(getTypeByID(Record[3+i], true)); 263 264 // FIXME: PARAM TYS. 265 ResultTy = FunctionType::get(getTypeByID(Record[1], true), ArgTys, 266 Record[0]); 267 break; 268 } 269 case bitc::TYPE_CODE_STRUCT: { // STRUCT: [ispacked, #elts, eltty x N] 270 if (Record.size() < 2 || Record.size() < Record[1]+2) 271 return Error("Invalid STRUCT type record"); 272 std::vector<const Type*> EltTys; 273 for (unsigned i = 0, e = Record[1]; i != e; ++i) 274 EltTys.push_back(getTypeByID(Record[2+i], true)); 275 ResultTy = StructType::get(EltTys, Record[0]); 276 break; 277 } 278 case bitc::TYPE_CODE_ARRAY: // ARRAY: [numelts, eltty] 279 if (Record.size() < 2) 280 return Error("Invalid ARRAY type record"); 281 ResultTy = ArrayType::get(getTypeByID(Record[1], true), Record[0]); 282 break; 283 case bitc::TYPE_CODE_VECTOR: // VECTOR: [numelts, eltty] 284 if (Record.size() < 2) 285 return Error("Invalid VECTOR type record"); 286 ResultTy = VectorType::get(getTypeByID(Record[1], true), Record[0]); 287 break; 288 } 289 290 if (NumRecords == TypeList.size()) { 291 // If this is a new type slot, just append it. 292 TypeList.push_back(ResultTy ? ResultTy : OpaqueType::get()); 293 ++NumRecords; 294 } else if (ResultTy == 0) { 295 // Otherwise, this was forward referenced, so an opaque type was created, 296 // but the result type is actually just an opaque. Leave the one we 297 // created previously. 298 ++NumRecords; 299 } else { 300 // Otherwise, this was forward referenced, so an opaque type was created. 301 // Resolve the opaque type to the real type now. 302 assert(NumRecords < TypeList.size() && "Typelist imbalance"); 303 const OpaqueType *OldTy = cast<OpaqueType>(TypeList[NumRecords++].get()); 304 305 // Don't directly push the new type on the Tab. Instead we want to replace 306 // the opaque type we previously inserted with the new concrete value. The 307 // refinement from the abstract (opaque) type to the new type causes all 308 // uses of the abstract type to use the concrete type (NewTy). This will 309 // also cause the opaque type to be deleted. 310 const_cast<OpaqueType*>(OldTy)->refineAbstractTypeTo(ResultTy); 311 312 // This should have replaced the old opaque type with the new type in the 313 // value table... or with a preexisting type that was already in the 314 // system. Let's just make sure it did. 315 assert(TypeList[NumRecords-1].get() != OldTy && 316 "refineAbstractType didn't work!"); 317 } 318 } 319} 320 321 322bool BitcodeReader::ParseTypeSymbolTable() { 323 if (Stream.EnterSubBlock()) 324 return Error("Malformed block record"); 325 326 SmallVector<uint64_t, 64> Record; 327 328 // Read all the records for this type table. 329 std::string TypeName; 330 while (1) { 331 unsigned Code = Stream.ReadCode(); 332 if (Code == bitc::END_BLOCK) { 333 if (Stream.ReadBlockEnd()) 334 return Error("Error at end of type symbol table block"); 335 return false; 336 } 337 338 if (Code == bitc::ENTER_SUBBLOCK) { 339 // No known subblocks, always skip them. 340 Stream.ReadSubBlockID(); 341 if (Stream.SkipBlock()) 342 return Error("Malformed block record"); 343 continue; 344 } 345 346 if (Code == bitc::DEFINE_ABBREV) { 347 Stream.ReadAbbrevRecord(); 348 continue; 349 } 350 351 // Read a record. 352 Record.clear(); 353 switch (Stream.ReadRecord(Code, Record)) { 354 default: // Default behavior: unknown type. 355 break; 356 case bitc::TST_CODE_ENTRY: // TST_ENTRY: [typeid, namelen, namechar x N] 357 if (ConvertToString(Record, 1, TypeName)) 358 return Error("Invalid TST_ENTRY record"); 359 unsigned TypeID = Record[0]; 360 if (TypeID >= TypeList.size()) 361 return Error("Invalid Type ID in TST_ENTRY record"); 362 363 TheModule->addTypeName(TypeName, TypeList[TypeID].get()); 364 TypeName.clear(); 365 break; 366 } 367 } 368} 369 370bool BitcodeReader::ParseValueSymbolTable() { 371 if (Stream.EnterSubBlock()) 372 return Error("Malformed block record"); 373 374 SmallVector<uint64_t, 64> Record; 375 376 // Read all the records for this value table. 377 SmallString<128> ValueName; 378 while (1) { 379 unsigned Code = Stream.ReadCode(); 380 if (Code == bitc::END_BLOCK) { 381 if (Stream.ReadBlockEnd()) 382 return Error("Error at end of value symbol table block"); 383 return false; 384 } 385 if (Code == bitc::ENTER_SUBBLOCK) { 386 // No known subblocks, always skip them. 387 Stream.ReadSubBlockID(); 388 if (Stream.SkipBlock()) 389 return Error("Malformed block record"); 390 continue; 391 } 392 393 if (Code == bitc::DEFINE_ABBREV) { 394 Stream.ReadAbbrevRecord(); 395 continue; 396 } 397 398 // Read a record. 399 Record.clear(); 400 switch (Stream.ReadRecord(Code, Record)) { 401 default: // Default behavior: unknown type. 402 break; 403 case bitc::VST_CODE_ENTRY: // VST_ENTRY: [valueid, namelen, namechar x N] 404 if (ConvertToString(Record, 1, ValueName)) 405 return Error("Invalid TST_ENTRY record"); 406 unsigned ValueID = Record[0]; 407 if (ValueID >= ValueList.size()) 408 return Error("Invalid Value ID in VST_ENTRY record"); 409 Value *V = ValueList[ValueID]; 410 411 V->setName(&ValueName[0], ValueName.size()); 412 ValueName.clear(); 413 break; 414 case bitc::VST_CODE_BBENTRY: 415 if (ConvertToString(Record, 1, ValueName)) 416 return Error("Invalid VST_BBENTRY record"); 417 BasicBlock *BB = getBasicBlock(Record[0]); 418 if (BB == 0) 419 return Error("Invalid BB ID in VST_BBENTRY record"); 420 421 BB->setName(&ValueName[0], ValueName.size()); 422 ValueName.clear(); 423 break; 424 } 425 } 426} 427 428/// DecodeSignRotatedValue - Decode a signed value stored with the sign bit in 429/// the LSB for dense VBR encoding. 430static uint64_t DecodeSignRotatedValue(uint64_t V) { 431 if ((V & 1) == 0) 432 return V >> 1; 433 if (V != 1) 434 return -(V >> 1); 435 // There is no such thing as -0 with integers. "-0" really means MININT. 436 return 1ULL << 63; 437} 438 439/// ResolveGlobalAndAliasInits - Resolve all of the initializers for global 440/// values and aliases that we can. 441bool BitcodeReader::ResolveGlobalAndAliasInits() { 442 std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInitWorklist; 443 std::vector<std::pair<GlobalAlias*, unsigned> > AliasInitWorklist; 444 445 GlobalInitWorklist.swap(GlobalInits); 446 AliasInitWorklist.swap(AliasInits); 447 448 while (!GlobalInitWorklist.empty()) { 449 unsigned ValID = GlobalInitWorklist.back().second; 450 if (ValID >= ValueList.size()) { 451 // Not ready to resolve this yet, it requires something later in the file. 452 GlobalInits.push_back(GlobalInitWorklist.back()); 453 } else { 454 if (Constant *C = dyn_cast<Constant>(ValueList[ValID])) 455 GlobalInitWorklist.back().first->setInitializer(C); 456 else 457 return Error("Global variable initializer is not a constant!"); 458 } 459 GlobalInitWorklist.pop_back(); 460 } 461 462 while (!AliasInitWorklist.empty()) { 463 unsigned ValID = AliasInitWorklist.back().second; 464 if (ValID >= ValueList.size()) { 465 AliasInits.push_back(AliasInitWorklist.back()); 466 } else { 467 if (Constant *C = dyn_cast<Constant>(ValueList[ValID])) 468 AliasInitWorklist.back().first->setAliasee(C); 469 else 470 return Error("Alias initializer is not a constant!"); 471 } 472 AliasInitWorklist.pop_back(); 473 } 474 return false; 475} 476 477 478bool BitcodeReader::ParseConstants() { 479 if (Stream.EnterSubBlock()) 480 return Error("Malformed block record"); 481 482 SmallVector<uint64_t, 64> Record; 483 484 // Read all the records for this value table. 485 const Type *CurTy = Type::Int32Ty; 486 unsigned NextCstNo = ValueList.size(); 487 while (1) { 488 unsigned Code = Stream.ReadCode(); 489 if (Code == bitc::END_BLOCK) { 490 if (NextCstNo != ValueList.size()) 491 return Error("Invalid constant reference!"); 492 493 if (Stream.ReadBlockEnd()) 494 return Error("Error at end of constants block"); 495 return false; 496 } 497 498 if (Code == bitc::ENTER_SUBBLOCK) { 499 // No known subblocks, always skip them. 500 Stream.ReadSubBlockID(); 501 if (Stream.SkipBlock()) 502 return Error("Malformed block record"); 503 continue; 504 } 505 506 if (Code == bitc::DEFINE_ABBREV) { 507 Stream.ReadAbbrevRecord(); 508 continue; 509 } 510 511 // Read a record. 512 Record.clear(); 513 Value *V = 0; 514 switch (Stream.ReadRecord(Code, Record)) { 515 default: // Default behavior: unknown constant 516 case bitc::CST_CODE_UNDEF: // UNDEF 517 V = UndefValue::get(CurTy); 518 break; 519 case bitc::CST_CODE_SETTYPE: // SETTYPE: [typeid] 520 if (Record.empty()) 521 return Error("Malformed CST_SETTYPE record"); 522 if (Record[0] >= TypeList.size()) 523 return Error("Invalid Type ID in CST_SETTYPE record"); 524 CurTy = TypeList[Record[0]]; 525 continue; // Skip the ValueList manipulation. 526 case bitc::CST_CODE_NULL: // NULL 527 V = Constant::getNullValue(CurTy); 528 break; 529 case bitc::CST_CODE_INTEGER: // INTEGER: [intval] 530 if (!isa<IntegerType>(CurTy) || Record.empty()) 531 return Error("Invalid CST_INTEGER record"); 532 V = ConstantInt::get(CurTy, DecodeSignRotatedValue(Record[0])); 533 break; 534 case bitc::CST_CODE_WIDE_INTEGER: {// WIDE_INTEGER: [n, n x intval] 535 if (!isa<IntegerType>(CurTy) || Record.empty() || 536 Record.size() < Record[0]+1) 537 return Error("Invalid WIDE_INTEGER record"); 538 539 unsigned NumWords = Record[0]; 540 SmallVector<uint64_t, 8> Words; 541 Words.resize(NumWords); 542 for (unsigned i = 0; i != NumWords; ++i) 543 Words[i] = DecodeSignRotatedValue(Record[i+1]); 544 V = ConstantInt::get(APInt(cast<IntegerType>(CurTy)->getBitWidth(), 545 NumWords, &Words[0])); 546 break; 547 } 548 case bitc::CST_CODE_FLOAT: // FLOAT: [fpval] 549 if (Record.empty()) 550 return Error("Invalid FLOAT record"); 551 if (CurTy == Type::FloatTy) 552 V = ConstantFP::get(CurTy, BitsToFloat(Record[0])); 553 else if (CurTy == Type::DoubleTy) 554 V = ConstantFP::get(CurTy, BitsToDouble(Record[0])); 555 else 556 V = UndefValue::get(CurTy); 557 break; 558 559 case bitc::CST_CODE_AGGREGATE: {// AGGREGATE: [n, n x value number] 560 if (Record.empty() || Record.size() < Record[0]+1) 561 return Error("Invalid CST_AGGREGATE record"); 562 563 unsigned Size = Record[0]; 564 std::vector<Constant*> Elts; 565 566 if (const StructType *STy = dyn_cast<StructType>(CurTy)) { 567 for (unsigned i = 0; i != Size; ++i) 568 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], 569 STy->getElementType(i))); 570 V = ConstantStruct::get(STy, Elts); 571 } else if (const ArrayType *ATy = dyn_cast<ArrayType>(CurTy)) { 572 const Type *EltTy = ATy->getElementType(); 573 for (unsigned i = 0; i != Size; ++i) 574 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], EltTy)); 575 V = ConstantArray::get(ATy, Elts); 576 } else if (const VectorType *VTy = dyn_cast<VectorType>(CurTy)) { 577 const Type *EltTy = VTy->getElementType(); 578 for (unsigned i = 0; i != Size; ++i) 579 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], EltTy)); 580 V = ConstantVector::get(Elts); 581 } else { 582 V = UndefValue::get(CurTy); 583 } 584 break; 585 } 586 587 case bitc::CST_CODE_CE_BINOP: { // CE_BINOP: [opcode, opval, opval] 588 if (Record.size() < 3) return Error("Invalid CE_BINOP record"); 589 int Opc = GetDecodedBinaryOpcode(Record[0], CurTy); 590 if (Opc < 0) { 591 V = UndefValue::get(CurTy); // Unknown binop. 592 } else { 593 Constant *LHS = ValueList.getConstantFwdRef(Record[1], CurTy); 594 Constant *RHS = ValueList.getConstantFwdRef(Record[2], CurTy); 595 V = ConstantExpr::get(Opc, LHS, RHS); 596 } 597 break; 598 } 599 case bitc::CST_CODE_CE_CAST: { // CE_CAST: [opcode, opty, opval] 600 if (Record.size() < 3) return Error("Invalid CE_CAST record"); 601 int Opc = GetDecodedCastOpcode(Record[0]); 602 if (Opc < 0) { 603 V = UndefValue::get(CurTy); // Unknown cast. 604 } else { 605 const Type *OpTy = getTypeByID(Record[1]); 606 Constant *Op = ValueList.getConstantFwdRef(Record[2], OpTy); 607 V = ConstantExpr::getCast(Opc, Op, CurTy); 608 } 609 break; 610 } 611 case bitc::CST_CODE_CE_GEP: { // CE_GEP: [n x operands] 612 if ((Record.size() & 1) == 0) return Error("Invalid CE_GEP record"); 613 SmallVector<Constant*, 16> Elts; 614 for (unsigned i = 1, e = Record.size(); i != e; i += 2) { 615 const Type *ElTy = getTypeByID(Record[i]); 616 if (!ElTy) return Error("Invalid CE_GEP record"); 617 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], ElTy)); 618 } 619 V = ConstantExpr::getGetElementPtr(Elts[0], &Elts[1], Elts.size()-1); 620 break; 621 } 622 case bitc::CST_CODE_CE_SELECT: // CE_SELECT: [opval#, opval#, opval#] 623 if (Record.size() < 3) return Error("Invalid CE_SELECT record"); 624 V = ConstantExpr::getSelect(ValueList.getConstantFwdRef(Record[0], 625 Type::Int1Ty), 626 ValueList.getConstantFwdRef(Record[1],CurTy), 627 ValueList.getConstantFwdRef(Record[2],CurTy)); 628 break; 629 case bitc::CST_CODE_CE_EXTRACTELT: { // CE_EXTRACTELT: [opty, opval, opval] 630 if (Record.size() < 3) return Error("Invalid CE_EXTRACTELT record"); 631 const VectorType *OpTy = 632 dyn_cast_or_null<VectorType>(getTypeByID(Record[0])); 633 if (OpTy == 0) return Error("Invalid CE_EXTRACTELT record"); 634 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 635 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], 636 OpTy->getElementType()); 637 V = ConstantExpr::getExtractElement(Op0, Op1); 638 break; 639 } 640 case bitc::CST_CODE_CE_INSERTELT: { // CE_INSERTELT: [opval, opval, opval] 641 const VectorType *OpTy = dyn_cast<VectorType>(CurTy); 642 if (Record.size() < 3 || OpTy == 0) 643 return Error("Invalid CE_INSERTELT record"); 644 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); 645 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], 646 OpTy->getElementType()); 647 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], Type::Int32Ty); 648 V = ConstantExpr::getInsertElement(Op0, Op1, Op2); 649 break; 650 } 651 case bitc::CST_CODE_CE_SHUFFLEVEC: { // CE_SHUFFLEVEC: [opval, opval, opval] 652 const VectorType *OpTy = dyn_cast<VectorType>(CurTy); 653 if (Record.size() < 3 || OpTy == 0) 654 return Error("Invalid CE_INSERTELT record"); 655 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); 656 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], OpTy); 657 const Type *ShufTy=VectorType::get(Type::Int32Ty, OpTy->getNumElements()); 658 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], ShufTy); 659 V = ConstantExpr::getShuffleVector(Op0, Op1, Op2); 660 break; 661 } 662 case bitc::CST_CODE_CE_CMP: { // CE_CMP: [opty, opval, opval, pred] 663 if (Record.size() < 4) return Error("Invalid CE_CMP record"); 664 const Type *OpTy = getTypeByID(Record[0]); 665 if (OpTy == 0) return Error("Invalid CE_CMP record"); 666 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 667 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy); 668 669 if (OpTy->isFloatingPoint()) 670 V = ConstantExpr::getFCmp(Record[3], Op0, Op1); 671 else 672 V = ConstantExpr::getICmp(Record[3], Op0, Op1); 673 break; 674 } 675 } 676 677 ValueList.AssignValue(V, NextCstNo); 678 ++NextCstNo; 679 } 680} 681 682/// RememberAndSkipFunctionBody - When we see the block for a function body, 683/// remember where it is and then skip it. This lets us lazily deserialize the 684/// functions. 685bool BitcodeReader::RememberAndSkipFunctionBody() { 686 // Get the function we are talking about. 687 if (FunctionsWithBodies.empty()) 688 return Error("Insufficient function protos"); 689 690 Function *Fn = FunctionsWithBodies.back(); 691 FunctionsWithBodies.pop_back(); 692 693 // Save the current stream state. 694 uint64_t CurBit = Stream.GetCurrentBitNo(); 695 DeferredFunctionInfo[Fn] = std::make_pair(CurBit, Fn->getLinkage()); 696 697 // Set the functions linkage to GhostLinkage so we know it is lazily 698 // deserialized. 699 Fn->setLinkage(GlobalValue::GhostLinkage); 700 701 // Skip over the function block for now. 702 if (Stream.SkipBlock()) 703 return Error("Malformed block record"); 704 return false; 705} 706 707bool BitcodeReader::ParseModule(const std::string &ModuleID) { 708 // Reject multiple MODULE_BLOCK's in a single bitstream. 709 if (TheModule) 710 return Error("Multiple MODULE_BLOCKs in same stream"); 711 712 if (Stream.EnterSubBlock()) 713 return Error("Malformed block record"); 714 715 // Otherwise, create the module. 716 TheModule = new Module(ModuleID); 717 718 SmallVector<uint64_t, 64> Record; 719 std::vector<std::string> SectionTable; 720 721 // Read all the records for this module. 722 while (!Stream.AtEndOfStream()) { 723 unsigned Code = Stream.ReadCode(); 724 if (Code == bitc::END_BLOCK) { 725 if (Stream.ReadBlockEnd()) 726 return Error("Error at end of module block"); 727 728 // Patch the initializers for globals and aliases up. 729 ResolveGlobalAndAliasInits(); 730 if (!GlobalInits.empty() || !AliasInits.empty()) 731 return Error("Malformed global initializer set"); 732 if (!FunctionsWithBodies.empty()) 733 return Error("Too few function bodies found"); 734 735 // Force deallocation of memory for these vectors to favor the client that 736 // want lazy deserialization. 737 std::vector<std::pair<GlobalVariable*, unsigned> >().swap(GlobalInits); 738 std::vector<std::pair<GlobalAlias*, unsigned> >().swap(AliasInits); 739 std::vector<Function*>().swap(FunctionsWithBodies); 740 return false; 741 } 742 743 if (Code == bitc::ENTER_SUBBLOCK) { 744 switch (Stream.ReadSubBlockID()) { 745 default: // Skip unknown content. 746 if (Stream.SkipBlock()) 747 return Error("Malformed block record"); 748 break; 749 case bitc::TYPE_BLOCK_ID: 750 if (ParseTypeTable()) 751 return true; 752 break; 753 case bitc::TYPE_SYMTAB_BLOCK_ID: 754 if (ParseTypeSymbolTable()) 755 return true; 756 break; 757 case bitc::VALUE_SYMTAB_BLOCK_ID: 758 if (ParseValueSymbolTable()) 759 return true; 760 break; 761 case bitc::CONSTANTS_BLOCK_ID: 762 if (ParseConstants() || ResolveGlobalAndAliasInits()) 763 return true; 764 break; 765 case bitc::FUNCTION_BLOCK_ID: 766 // If this is the first function body we've seen, reverse the 767 // FunctionsWithBodies list. 768 if (!HasReversedFunctionsWithBodies) { 769 std::reverse(FunctionsWithBodies.begin(), FunctionsWithBodies.end()); 770 HasReversedFunctionsWithBodies = true; 771 } 772 773 if (RememberAndSkipFunctionBody()) 774 return true; 775 break; 776 } 777 continue; 778 } 779 780 if (Code == bitc::DEFINE_ABBREV) { 781 Stream.ReadAbbrevRecord(); 782 continue; 783 } 784 785 // Read a record. 786 switch (Stream.ReadRecord(Code, Record)) { 787 default: break; // Default behavior, ignore unknown content. 788 case bitc::MODULE_CODE_VERSION: // VERSION: [version#] 789 if (Record.size() < 1) 790 return Error("Malformed MODULE_CODE_VERSION"); 791 // Only version #0 is supported so far. 792 if (Record[0] != 0) 793 return Error("Unknown bitstream version!"); 794 break; 795 case bitc::MODULE_CODE_TRIPLE: { // TRIPLE: [strlen, strchr x N] 796 std::string S; 797 if (ConvertToString(Record, 0, S)) 798 return Error("Invalid MODULE_CODE_TRIPLE record"); 799 TheModule->setTargetTriple(S); 800 break; 801 } 802 case bitc::MODULE_CODE_DATALAYOUT: { // DATALAYOUT: [strlen, strchr x N] 803 std::string S; 804 if (ConvertToString(Record, 0, S)) 805 return Error("Invalid MODULE_CODE_DATALAYOUT record"); 806 TheModule->setDataLayout(S); 807 break; 808 } 809 case bitc::MODULE_CODE_ASM: { // ASM: [strlen, strchr x N] 810 std::string S; 811 if (ConvertToString(Record, 0, S)) 812 return Error("Invalid MODULE_CODE_ASM record"); 813 TheModule->setModuleInlineAsm(S); 814 break; 815 } 816 case bitc::MODULE_CODE_DEPLIB: { // DEPLIB: [strlen, strchr x N] 817 std::string S; 818 if (ConvertToString(Record, 0, S)) 819 return Error("Invalid MODULE_CODE_DEPLIB record"); 820 TheModule->addLibrary(S); 821 break; 822 } 823 case bitc::MODULE_CODE_SECTIONNAME: { // SECTIONNAME: [strlen, strchr x N] 824 std::string S; 825 if (ConvertToString(Record, 0, S)) 826 return Error("Invalid MODULE_CODE_SECTIONNAME record"); 827 SectionTable.push_back(S); 828 break; 829 } 830 // GLOBALVAR: [type, isconst, initid, 831 // linkage, alignment, section, visibility, threadlocal] 832 case bitc::MODULE_CODE_GLOBALVAR: { 833 if (Record.size() < 6) 834 return Error("Invalid MODULE_CODE_GLOBALVAR record"); 835 const Type *Ty = getTypeByID(Record[0]); 836 if (!isa<PointerType>(Ty)) 837 return Error("Global not a pointer type!"); 838 Ty = cast<PointerType>(Ty)->getElementType(); 839 840 bool isConstant = Record[1]; 841 GlobalValue::LinkageTypes Linkage = GetDecodedLinkage(Record[3]); 842 unsigned Alignment = (1 << Record[4]) >> 1; 843 std::string Section; 844 if (Record[5]) { 845 if (Record[5]-1 >= SectionTable.size()) 846 return Error("Invalid section ID"); 847 Section = SectionTable[Record[5]-1]; 848 } 849 GlobalValue::VisibilityTypes Visibility = GlobalValue::DefaultVisibility; 850 if (Record.size() >= 6) Visibility = GetDecodedVisibility(Record[6]); 851 bool isThreadLocal = false; 852 if (Record.size() >= 7) isThreadLocal = Record[7]; 853 854 GlobalVariable *NewGV = 855 new GlobalVariable(Ty, isConstant, Linkage, 0, "", TheModule); 856 NewGV->setAlignment(Alignment); 857 if (!Section.empty()) 858 NewGV->setSection(Section); 859 NewGV->setVisibility(Visibility); 860 NewGV->setThreadLocal(isThreadLocal); 861 862 ValueList.push_back(NewGV); 863 864 // Remember which value to use for the global initializer. 865 if (unsigned InitID = Record[2]) 866 GlobalInits.push_back(std::make_pair(NewGV, InitID-1)); 867 break; 868 } 869 // FUNCTION: [type, callingconv, isproto, linkage, alignment, section, 870 // visibility] 871 case bitc::MODULE_CODE_FUNCTION: { 872 if (Record.size() < 7) 873 return Error("Invalid MODULE_CODE_FUNCTION record"); 874 const Type *Ty = getTypeByID(Record[0]); 875 if (!isa<PointerType>(Ty)) 876 return Error("Function not a pointer type!"); 877 const FunctionType *FTy = 878 dyn_cast<FunctionType>(cast<PointerType>(Ty)->getElementType()); 879 if (!FTy) 880 return Error("Function not a pointer to function type!"); 881 882 Function *Func = new Function(FTy, GlobalValue::ExternalLinkage, 883 "", TheModule); 884 885 Func->setCallingConv(Record[1]); 886 bool isProto = Record[2]; 887 Func->setLinkage(GetDecodedLinkage(Record[3])); 888 Func->setAlignment((1 << Record[4]) >> 1); 889 if (Record[5]) { 890 if (Record[5]-1 >= SectionTable.size()) 891 return Error("Invalid section ID"); 892 Func->setSection(SectionTable[Record[5]-1]); 893 } 894 Func->setVisibility(GetDecodedVisibility(Record[6])); 895 896 ValueList.push_back(Func); 897 898 // If this is a function with a body, remember the prototype we are 899 // creating now, so that we can match up the body with them later. 900 if (!isProto) 901 FunctionsWithBodies.push_back(Func); 902 break; 903 } 904 // ALIAS: [alias type, aliasee val#, linkage] 905 case bitc::MODULE_CODE_ALIAS: { 906 if (Record.size() < 3) 907 return Error("Invalid MODULE_ALIAS record"); 908 const Type *Ty = getTypeByID(Record[0]); 909 if (!isa<PointerType>(Ty)) 910 return Error("Function not a pointer type!"); 911 912 GlobalAlias *NewGA = new GlobalAlias(Ty, GetDecodedLinkage(Record[2]), 913 "", 0, TheModule); 914 ValueList.push_back(NewGA); 915 AliasInits.push_back(std::make_pair(NewGA, Record[1])); 916 break; 917 } 918 /// MODULE_CODE_PURGEVALS: [numvals] 919 case bitc::MODULE_CODE_PURGEVALS: 920 // Trim down the value list to the specified size. 921 if (Record.size() < 1 || Record[0] > ValueList.size()) 922 return Error("Invalid MODULE_PURGEVALS record"); 923 ValueList.shrinkTo(Record[0]); 924 break; 925 } 926 Record.clear(); 927 } 928 929 return Error("Premature end of bitstream"); 930} 931 932 933bool BitcodeReader::ParseBitcode() { 934 TheModule = 0; 935 936 if (Buffer->getBufferSize() & 3) 937 return Error("Bitcode stream should be a multiple of 4 bytes in length"); 938 939 unsigned char *BufPtr = (unsigned char *)Buffer->getBufferStart(); 940 Stream.init(BufPtr, BufPtr+Buffer->getBufferSize()); 941 942 // Sniff for the signature. 943 if (Stream.Read(8) != 'B' || 944 Stream.Read(8) != 'C' || 945 Stream.Read(4) != 0x0 || 946 Stream.Read(4) != 0xC || 947 Stream.Read(4) != 0xE || 948 Stream.Read(4) != 0xD) 949 return Error("Invalid bitcode signature"); 950 951 // We expect a number of well-defined blocks, though we don't necessarily 952 // need to understand them all. 953 while (!Stream.AtEndOfStream()) { 954 unsigned Code = Stream.ReadCode(); 955 956 if (Code != bitc::ENTER_SUBBLOCK) 957 return Error("Invalid record at top-level"); 958 959 unsigned BlockID = Stream.ReadSubBlockID(); 960 961 // We only know the MODULE subblock ID. 962 if (BlockID == bitc::MODULE_BLOCK_ID) { 963 if (ParseModule(Buffer->getBufferIdentifier())) 964 return true; 965 } else if (Stream.SkipBlock()) { 966 return Error("Malformed block record"); 967 } 968 } 969 970 return false; 971} 972 973 974bool BitcodeReader::materializeFunction(Function *F, std::string *ErrInfo) { 975 // If it already is material, ignore the request. 976 if (!F->hasNotBeenReadFromBytecode()) return false; 977 978 DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator DFII = 979 DeferredFunctionInfo.find(F); 980 assert(DFII != DeferredFunctionInfo.end() && "Deferred function not found!"); 981 982 // Move the bit stream to the saved position of the deferred function body and 983 // restore the real linkage type for the function. 984 Stream.JumpToBit(DFII->second.first); 985 F->setLinkage((GlobalValue::LinkageTypes)DFII->second.second); 986 DeferredFunctionInfo.erase(DFII); 987 988 if (ParseFunctionBody(F)) { 989 if (ErrInfo) *ErrInfo = ErrorString; 990 return true; 991 } 992 993 return false; 994} 995 996Module *BitcodeReader::materializeModule(std::string *ErrInfo) { 997 DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator I = 998 DeferredFunctionInfo.begin(); 999 while (!DeferredFunctionInfo.empty()) { 1000 Function *F = (*I++).first; 1001 assert(F->hasNotBeenReadFromBytecode() && 1002 "Deserialized function found in map!"); 1003 if (materializeFunction(F, ErrInfo)) 1004 return 0; 1005 } 1006 return TheModule; 1007} 1008 1009 1010/// ParseFunctionBody - Lazily parse the specified function body block. 1011bool BitcodeReader::ParseFunctionBody(Function *F) { 1012 if (Stream.EnterSubBlock()) 1013 return Error("Malformed block record"); 1014 1015 unsigned ModuleValueListSize = ValueList.size(); 1016 1017 // Add all the function arguments to the value table. 1018 for(Function::arg_iterator I = F->arg_begin(), E = F->arg_end(); I != E; ++I) 1019 ValueList.push_back(I); 1020 1021 unsigned NextValueNo = ValueList.size(); 1022 BasicBlock *CurBB = 0; 1023 unsigned CurBBNo = 0; 1024 1025 // Read all the records. 1026 SmallVector<uint64_t, 64> Record; 1027 while (1) { 1028 unsigned Code = Stream.ReadCode(); 1029 if (Code == bitc::END_BLOCK) { 1030 if (Stream.ReadBlockEnd()) 1031 return Error("Error at end of function block"); 1032 break; 1033 } 1034 1035 if (Code == bitc::ENTER_SUBBLOCK) { 1036 switch (Stream.ReadSubBlockID()) { 1037 default: // Skip unknown content. 1038 if (Stream.SkipBlock()) 1039 return Error("Malformed block record"); 1040 break; 1041 case bitc::CONSTANTS_BLOCK_ID: 1042 if (ParseConstants()) return true; 1043 NextValueNo = ValueList.size(); 1044 break; 1045 case bitc::VALUE_SYMTAB_BLOCK_ID: 1046 if (ParseValueSymbolTable()) return true; 1047 break; 1048 } 1049 continue; 1050 } 1051 1052 if (Code == bitc::DEFINE_ABBREV) { 1053 Stream.ReadAbbrevRecord(); 1054 continue; 1055 } 1056 1057 // Read a record. 1058 Record.clear(); 1059 Instruction *I = 0; 1060 switch (Stream.ReadRecord(Code, Record)) { 1061 default: // Default behavior: reject 1062 return Error("Unknown instruction"); 1063 case bitc::FUNC_CODE_DECLAREBLOCKS: // DECLAREBLOCKS: [nblocks] 1064 if (Record.size() < 1 || Record[0] == 0) 1065 return Error("Invalid DECLAREBLOCKS record"); 1066 // Create all the basic blocks for the function. 1067 FunctionBBs.resize(Record[0]); 1068 for (unsigned i = 0, e = FunctionBBs.size(); i != e; ++i) 1069 FunctionBBs[i] = new BasicBlock("", F); 1070 CurBB = FunctionBBs[0]; 1071 continue; 1072 1073 case bitc::FUNC_CODE_INST_BINOP: { // BINOP: [opcode, ty, opval, opval] 1074 if (Record.size() < 4) return Error("Invalid BINOP record"); 1075 const Type *Ty = getTypeByID(Record[1]); 1076 int Opc = GetDecodedBinaryOpcode(Record[0], Ty); 1077 Value *LHS = getFnValueByID(Record[2], Ty); 1078 Value *RHS = getFnValueByID(Record[3], Ty); 1079 if (Opc == -1 || Ty == 0 || LHS == 0 || RHS == 0) 1080 return Error("Invalid BINOP record"); 1081 I = BinaryOperator::create((Instruction::BinaryOps)Opc, LHS, RHS); 1082 break; 1083 } 1084 case bitc::FUNC_CODE_INST_CAST: { // CAST: [opcode, ty, opty, opval] 1085 if (Record.size() < 4) return Error("Invalid CAST record"); 1086 int Opc = GetDecodedCastOpcode(Record[0]); 1087 const Type *ResTy = getTypeByID(Record[1]); 1088 const Type *OpTy = getTypeByID(Record[2]); 1089 Value *Op = getFnValueByID(Record[3], OpTy); 1090 if (Opc == -1 || ResTy == 0 || OpTy == 0 || Op == 0) 1091 return Error("Invalid CAST record"); 1092 I = CastInst::create((Instruction::CastOps)Opc, Op, ResTy); 1093 break; 1094 } 1095 case bitc::FUNC_CODE_INST_GEP: { // GEP: [n, n x operands] 1096 if (Record.size() < 2 || (Record.size() & 1)) 1097 return Error("Invalid GEP record"); 1098 const Type *OpTy = getTypeByID(Record[0]); 1099 Value *Op = getFnValueByID(Record[1], OpTy); 1100 if (OpTy == 0 || Op == 0) 1101 return Error("Invalid GEP record"); 1102 1103 SmallVector<Value*, 16> GEPIdx; 1104 for (unsigned i = 1, e = Record.size()/2; i != e; ++i) { 1105 const Type *IdxTy = getTypeByID(Record[i*2]); 1106 Value *Idx = getFnValueByID(Record[i*2+1], IdxTy); 1107 if (IdxTy == 0 || Idx == 0) 1108 return Error("Invalid GEP record"); 1109 GEPIdx.push_back(Idx); 1110 } 1111 1112 I = new GetElementPtrInst(Op, &GEPIdx[0], GEPIdx.size()); 1113 break; 1114 } 1115 1116 case bitc::FUNC_CODE_INST_SELECT: { // SELECT: [ty, opval, opval, opval] 1117 if (Record.size() < 4) return Error("Invalid SELECT record"); 1118 const Type *Ty = getTypeByID(Record[0]); 1119 Value *Cond = getFnValueByID(Record[1], Type::Int1Ty); 1120 Value *LHS = getFnValueByID(Record[2], Ty); 1121 Value *RHS = getFnValueByID(Record[3], Ty); 1122 if (Ty == 0 || Cond == 0 || LHS == 0 || RHS == 0) 1123 return Error("Invalid SELECT record"); 1124 I = new SelectInst(Cond, LHS, RHS); 1125 break; 1126 } 1127 1128 case bitc::FUNC_CODE_INST_EXTRACTELT: { // EXTRACTELT: [opty, opval, opval] 1129 if (Record.size() < 3) return Error("Invalid EXTRACTELT record"); 1130 const Type *OpTy = getTypeByID(Record[0]); 1131 Value *Vec = getFnValueByID(Record[1], OpTy); 1132 Value *Idx = getFnValueByID(Record[2], Type::Int32Ty); 1133 if (OpTy == 0 || Vec == 0 || Idx == 0) 1134 return Error("Invalid EXTRACTELT record"); 1135 I = new ExtractElementInst(Vec, Idx); 1136 break; 1137 } 1138 1139 case bitc::FUNC_CODE_INST_INSERTELT: { // INSERTELT: [ty, opval,opval,opval] 1140 if (Record.size() < 4) return Error("Invalid INSERTELT record"); 1141 const VectorType *OpTy = 1142 dyn_cast_or_null<VectorType>(getTypeByID(Record[0])); 1143 if (OpTy == 0) return Error("Invalid INSERTELT record"); 1144 Value *Vec = getFnValueByID(Record[1], OpTy); 1145 Value *Elt = getFnValueByID(Record[2], OpTy->getElementType()); 1146 Value *Idx = getFnValueByID(Record[3], Type::Int32Ty); 1147 if (Vec == 0 || Elt == 0 || Idx == 0) 1148 return Error("Invalid INSERTELT record"); 1149 I = new InsertElementInst(Vec, Elt, Idx); 1150 break; 1151 } 1152 1153 case bitc::FUNC_CODE_INST_SHUFFLEVEC: {// SHUFFLEVEC: [ty,opval,opval,opval] 1154 if (Record.size() < 4) return Error("Invalid SHUFFLEVEC record"); 1155 const VectorType *OpTy = 1156 dyn_cast_or_null<VectorType>(getTypeByID(Record[0])); 1157 if (OpTy == 0) return Error("Invalid SHUFFLEVEC record"); 1158 Value *Vec1 = getFnValueByID(Record[1], OpTy); 1159 Value *Vec2 = getFnValueByID(Record[2], OpTy); 1160 Value *Mask = getFnValueByID(Record[3], 1161 VectorType::get(Type::Int32Ty, 1162 OpTy->getNumElements())); 1163 if (Vec1 == 0 || Vec2 == 0 || Mask == 0) 1164 return Error("Invalid SHUFFLEVEC record"); 1165 I = new ShuffleVectorInst(Vec1, Vec2, Mask); 1166 break; 1167 } 1168 1169 case bitc::FUNC_CODE_INST_CMP: { // CMP: [opty, opval, opval, pred] 1170 if (Record.size() < 4) return Error("Invalid CMP record"); 1171 const Type *OpTy = getTypeByID(Record[0]); 1172 Value *LHS = getFnValueByID(Record[1], OpTy); 1173 Value *RHS = getFnValueByID(Record[2], OpTy); 1174 if (OpTy == 0 || LHS == 0 || RHS == 0) 1175 return Error("Invalid CMP record"); 1176 if (OpTy->isFPOrFPVector()) 1177 I = new FCmpInst((FCmpInst::Predicate)Record[3], LHS, RHS); 1178 else 1179 I = new ICmpInst((ICmpInst::Predicate)Record[3], LHS, RHS); 1180 break; 1181 } 1182 1183 case bitc::FUNC_CODE_INST_RET: // RET: [opty,opval<optional>] 1184 if (Record.size() == 0) { 1185 I = new ReturnInst(); 1186 break; 1187 } 1188 if (Record.size() == 2) { 1189 const Type *OpTy = getTypeByID(Record[0]); 1190 Value *Op = getFnValueByID(Record[1], OpTy); 1191 if (!OpTy || !Op) 1192 return Error("Invalid RET record"); 1193 I = new ReturnInst(Op); 1194 break; 1195 } 1196 return Error("Invalid RET record"); 1197 case bitc::FUNC_CODE_INST_BR: { // BR: [bb#, bb#, opval] or [bb#] 1198 if (Record.size() != 1 && Record.size() != 3) 1199 return Error("Invalid BR record"); 1200 BasicBlock *TrueDest = getBasicBlock(Record[0]); 1201 if (TrueDest == 0) 1202 return Error("Invalid BR record"); 1203 1204 if (Record.size() == 1) 1205 I = new BranchInst(TrueDest); 1206 else { 1207 BasicBlock *FalseDest = getBasicBlock(Record[1]); 1208 Value *Cond = getFnValueByID(Record[2], Type::Int1Ty); 1209 if (FalseDest == 0 || Cond == 0) 1210 return Error("Invalid BR record"); 1211 I = new BranchInst(TrueDest, FalseDest, Cond); 1212 } 1213 break; 1214 } 1215 case bitc::FUNC_CODE_INST_SWITCH: { // SWITCH: [opty, opval, n, n x ops] 1216 if (Record.size() < 3 || (Record.size() & 1) == 0) 1217 return Error("Invalid SWITCH record"); 1218 const Type *OpTy = getTypeByID(Record[0]); 1219 Value *Cond = getFnValueByID(Record[1], OpTy); 1220 BasicBlock *Default = getBasicBlock(Record[2]); 1221 if (OpTy == 0 || Cond == 0 || Default == 0) 1222 return Error("Invalid SWITCH record"); 1223 unsigned NumCases = (Record.size()-3)/2; 1224 SwitchInst *SI = new SwitchInst(Cond, Default, NumCases); 1225 for (unsigned i = 0, e = NumCases; i != e; ++i) { 1226 ConstantInt *CaseVal = 1227 dyn_cast_or_null<ConstantInt>(getFnValueByID(Record[3+i*2], OpTy)); 1228 BasicBlock *DestBB = getBasicBlock(Record[1+3+i*2]); 1229 if (CaseVal == 0 || DestBB == 0) { 1230 delete SI; 1231 return Error("Invalid SWITCH record!"); 1232 } 1233 SI->addCase(CaseVal, DestBB); 1234 } 1235 I = SI; 1236 break; 1237 } 1238 1239 case bitc::FUNC_CODE_INST_INVOKE: { // INVOKE: [fnty, op0,op1,op2, ...] 1240 if (Record.size() < 4) 1241 return Error("Invalid INVOKE record"); 1242 const PointerType *CalleeTy = 1243 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1244 Value *Callee = getFnValueByID(Record[1], CalleeTy); 1245 BasicBlock *NormalBB = getBasicBlock(Record[2]); 1246 BasicBlock *UnwindBB = getBasicBlock(Record[3]); 1247 if (CalleeTy == 0 || Callee == 0 || NormalBB == 0 || UnwindBB == 0) 1248 return Error("Invalid INVOKE record"); 1249 1250 const FunctionType *FTy = 1251 dyn_cast<FunctionType>(CalleeTy->getElementType()); 1252 1253 // Check that the right number of fixed parameters are here. 1254 if (FTy == 0 || Record.size() < 4+FTy->getNumParams()) 1255 return Error("Invalid INVOKE record"); 1256 1257 SmallVector<Value*, 16> Ops; 1258 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) { 1259 Ops.push_back(getFnValueByID(Record[4+i], FTy->getParamType(4+i))); 1260 if (Ops.back() == 0) 1261 return Error("Invalid INVOKE record"); 1262 } 1263 1264 unsigned FirstVarargParam = 4+FTy->getNumParams(); 1265 if (FTy->isVarArg()) { 1266 // Read type/value pairs for varargs params. 1267 if ((Record.size()-FirstVarargParam) & 1) 1268 return Error("Invalid INVOKE record"); 1269 1270 for (unsigned i = FirstVarargParam, e = Record.size(); i != e; i += 2) { 1271 const Type *ArgTy = getTypeByID(Record[i]); 1272 Ops.push_back(getFnValueByID(Record[i+1], ArgTy)); 1273 if (Ops.back() == 0 || ArgTy == 0) 1274 return Error("Invalid INVOKE record"); 1275 } 1276 } else { 1277 if (Record.size() != FirstVarargParam) 1278 return Error("Invalid INVOKE record"); 1279 } 1280 1281 I = new InvokeInst(Callee, NormalBB, UnwindBB, &Ops[0], Ops.size()); 1282 break; 1283 } 1284 case bitc::FUNC_CODE_INST_UNWIND: // UNWIND 1285 I = new UnwindInst(); 1286 break; 1287 case bitc::FUNC_CODE_INST_UNREACHABLE: // UNREACHABLE 1288 I = new UnreachableInst(); 1289 break; 1290 case bitc::FUNC_CODE_INST_PHI: { // PHI: [ty, #ops, val0,bb0, ...] 1291 if (Record.size() < 2 || Record.size() < 2+Record[1] || (Record[1]&1)) 1292 return Error("Invalid PHI record"); 1293 const Type *Ty = getTypeByID(Record[0]); 1294 if (!Ty) return Error("Invalid PHI record"); 1295 1296 PHINode *PN = new PHINode(Ty); 1297 PN->reserveOperandSpace(Record[1]); 1298 1299 for (unsigned i = 0, e = Record[1]; i != e; i += 2) { 1300 Value *V = getFnValueByID(Record[2+i], Ty); 1301 BasicBlock *BB = getBasicBlock(Record[3+i]); 1302 if (!V || !BB) return Error("Invalid PHI record"); 1303 PN->addIncoming(V, BB); 1304 } 1305 I = PN; 1306 break; 1307 } 1308 1309 case bitc::FUNC_CODE_INST_MALLOC: { // MALLOC: [instty, op, align] 1310 if (Record.size() < 3) 1311 return Error("Invalid MALLOC record"); 1312 const PointerType *Ty = 1313 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1314 Value *Size = getFnValueByID(Record[1], Type::Int32Ty); 1315 unsigned Align = Record[2]; 1316 if (!Ty || !Size) return Error("Invalid MALLOC record"); 1317 I = new MallocInst(Ty->getElementType(), Size, (1 << Align) >> 1); 1318 break; 1319 } 1320 case bitc::FUNC_CODE_INST_FREE: { // FREE: [opty, op] 1321 if (Record.size() < 2) 1322 return Error("Invalid FREE record"); 1323 const Type *OpTy = getTypeByID(Record[0]); 1324 Value *Op = getFnValueByID(Record[1], OpTy); 1325 if (!OpTy || !Op) 1326 return Error("Invalid FREE record"); 1327 I = new FreeInst(Op); 1328 break; 1329 } 1330 case bitc::FUNC_CODE_INST_ALLOCA: { // ALLOCA: [instty, op, align] 1331 if (Record.size() < 3) 1332 return Error("Invalid ALLOCA record"); 1333 const PointerType *Ty = 1334 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1335 Value *Size = getFnValueByID(Record[1], Type::Int32Ty); 1336 unsigned Align = Record[2]; 1337 if (!Ty || !Size) return Error("Invalid ALLOCA record"); 1338 I = new AllocaInst(Ty->getElementType(), Size, (1 << Align) >> 1); 1339 break; 1340 } 1341 case bitc::FUNC_CODE_INST_LOAD: { // LOAD: [opty, op, align, vol] 1342 if (Record.size() < 4) 1343 return Error("Invalid LOAD record"); 1344 const Type *OpTy = getTypeByID(Record[0]); 1345 Value *Op = getFnValueByID(Record[1], OpTy); 1346 if (!OpTy || !Op) 1347 return Error("Invalid LOAD record"); 1348 I = new LoadInst(Op, "", Record[3], (1 << Record[2]) >> 1); 1349 break; 1350 } 1351 case bitc::FUNC_CODE_INST_STORE: { // STORE:[ptrty,val,ptr, align, vol] 1352 if (Record.size() < 5) 1353 return Error("Invalid LOAD record"); 1354 const PointerType *OpTy = 1355 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1356 Value *Op = getFnValueByID(Record[1], OpTy ? OpTy->getElementType() : 0); 1357 Value *Ptr = getFnValueByID(Record[2], OpTy); 1358 if (!OpTy || !Op || !Ptr) 1359 return Error("Invalid STORE record"); 1360 I = new StoreInst(Op, Ptr, (1 << Record[3]) >> 1, Record[4]); 1361 break; 1362 } 1363 case bitc::FUNC_CODE_INST_CALL: { // CALL: [fnty, fnid, arg0, arg1...] 1364 if (Record.size() < 2) 1365 return Error("Invalid CALL record"); 1366 const PointerType *OpTy = 1367 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1368 const FunctionType *FTy = 0; 1369 if (OpTy) FTy = dyn_cast<FunctionType>(OpTy->getElementType()); 1370 Value *Callee = getFnValueByID(Record[1], OpTy); 1371 if (!FTy || !Callee || Record.size() < FTy->getNumParams()+2) 1372 return Error("Invalid CALL record"); 1373 1374 SmallVector<Value*, 16> Args; 1375 // Read the fixed params. 1376 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) { 1377 Args.push_back(getFnValueByID(Record[i+2], FTy->getParamType(i))); 1378 if (Args.back() == 0) return Error("Invalid CALL record"); 1379 } 1380 1381 1382 // Read type/value pairs for varargs params. 1383 unsigned NextArg = FTy->getNumParams()+2; 1384 if (!FTy->isVarArg()) { 1385 if (NextArg != Record.size()) 1386 return Error("Invalid CALL record"); 1387 } else { 1388 if ((Record.size()-NextArg) & 1) 1389 return Error("Invalid CALL record"); 1390 for (unsigned e = Record.size(); NextArg != e; NextArg += 2) { 1391 Args.push_back(getFnValueByID(Record[NextArg+1], 1392 getTypeByID(Record[NextArg]))); 1393 if (Args.back() == 0) return Error("Invalid CALL record"); 1394 } 1395 } 1396 1397 I = new CallInst(Callee, &Args[0], Args.size()); 1398 break; 1399 } 1400 case bitc::FUNC_CODE_INST_VAARG: { // VAARG: [valistty, valist, instty] 1401 if (Record.size() < 3) 1402 return Error("Invalid VAARG record"); 1403 const Type *OpTy = getTypeByID(Record[0]); 1404 Value *Op = getFnValueByID(Record[1], OpTy); 1405 const Type *ResTy = getTypeByID(Record[2]); 1406 if (!OpTy || !Op || !ResTy) 1407 return Error("Invalid VAARG record"); 1408 I = new VAArgInst(Op, ResTy); 1409 break; 1410 } 1411 } 1412 1413 // Add instruction to end of current BB. If there is no current BB, reject 1414 // this file. 1415 if (CurBB == 0) { 1416 delete I; 1417 return Error("Invalid instruction with no BB"); 1418 } 1419 CurBB->getInstList().push_back(I); 1420 1421 // If this was a terminator instruction, move to the next block. 1422 if (isa<TerminatorInst>(I)) { 1423 ++CurBBNo; 1424 CurBB = CurBBNo < FunctionBBs.size() ? FunctionBBs[CurBBNo] : 0; 1425 } 1426 1427 // Non-void values get registered in the value table for future use. 1428 if (I && I->getType() != Type::VoidTy) 1429 ValueList.AssignValue(I, NextValueNo++); 1430 } 1431 1432 // Check the function list for unresolved values. 1433 if (Argument *A = dyn_cast<Argument>(ValueList.back())) { 1434 if (A->getParent() == 0) { 1435 // We found at least one unresolved value. Nuke them all to avoid leaks. 1436 for (unsigned i = ModuleValueListSize, e = ValueList.size(); i != e; ++i){ 1437 if ((A = dyn_cast<Argument>(ValueList.back())) && A->getParent() == 0) { 1438 A->replaceAllUsesWith(UndefValue::get(A->getType())); 1439 delete A; 1440 } 1441 } 1442 } 1443 return Error("Never resolved value found in function!"); 1444 } 1445 1446 // Trim the value list down to the size it was before we parsed this function. 1447 ValueList.shrinkTo(ModuleValueListSize); 1448 std::vector<BasicBlock*>().swap(FunctionBBs); 1449 1450 return false; 1451} 1452 1453 1454//===----------------------------------------------------------------------===// 1455// External interface 1456//===----------------------------------------------------------------------===// 1457 1458/// getBitcodeModuleProvider - lazy function-at-a-time loading from a file. 1459/// 1460ModuleProvider *llvm::getBitcodeModuleProvider(MemoryBuffer *Buffer, 1461 std::string *ErrMsg) { 1462 BitcodeReader *R = new BitcodeReader(Buffer); 1463 if (R->ParseBitcode()) { 1464 if (ErrMsg) 1465 *ErrMsg = R->getErrorString(); 1466 1467 // Don't let the BitcodeReader dtor delete 'Buffer'. 1468 R->releaseMemoryBuffer(); 1469 delete R; 1470 return 0; 1471 } 1472 return R; 1473} 1474 1475/// ParseBitcodeFile - Read the specified bitcode file, returning the module. 1476/// If an error occurs, return null and fill in *ErrMsg if non-null. 1477Module *llvm::ParseBitcodeFile(MemoryBuffer *Buffer, std::string *ErrMsg){ 1478 BitcodeReader *R; 1479 R = static_cast<BitcodeReader*>(getBitcodeModuleProvider(Buffer, ErrMsg)); 1480 if (!R) return 0; 1481 1482 // Read the whole module, get a pointer to it, tell ModuleProvider not to 1483 // delete it when its dtor is run. 1484 Module *M = R->releaseModule(ErrMsg); 1485 1486 // Don't let the BitcodeReader dtor delete 'Buffer'. 1487 R->releaseMemoryBuffer(); 1488 delete R; 1489 return M; 1490} 1491