BitcodeReader.cpp revision e9fabd94ab9aaa5853c0c3d659e62b1a1f2cc27b
1//===- BitcodeReader.cpp - Internal BitcodeReader implementation ----------===// 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 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/InlineAsm.h" 19#include "llvm/Instructions.h" 20#include "llvm/Module.h" 21#include "llvm/ParamAttrsList.h" 22#include "llvm/AutoUpgrade.h" 23#include "llvm/ADT/SmallString.h" 24#include "llvm/Support/MathExtras.h" 25#include "llvm/Support/MemoryBuffer.h" 26using namespace llvm; 27 28void BitcodeReader::FreeState() { 29 delete Buffer; 30 Buffer = 0; 31 std::vector<PATypeHolder>().swap(TypeList); 32 ValueList.clear(); 33 std::vector<const ParamAttrsList*>().swap(ParamAttrs); 34 std::vector<BasicBlock*>().swap(FunctionBBs); 35 std::vector<Function*>().swap(FunctionsWithBodies); 36 DeferredFunctionInfo.clear(); 37} 38 39//===----------------------------------------------------------------------===// 40// Helper functions to implement forward reference resolution, etc. 41//===----------------------------------------------------------------------===// 42 43/// ConvertToString - Convert a string from a record into an std::string, return 44/// true on failure. 45template<typename StrTy> 46static bool ConvertToString(SmallVector<uint64_t, 64> &Record, unsigned Idx, 47 StrTy &Result) { 48 if (Idx > Record.size()) 49 return true; 50 51 for (unsigned i = Idx, e = Record.size(); i != e; ++i) 52 Result += (char)Record[i]; 53 return false; 54} 55 56static GlobalValue::LinkageTypes GetDecodedLinkage(unsigned Val) { 57 switch (Val) { 58 default: // Map unknown/new linkages to external 59 case 0: return GlobalValue::ExternalLinkage; 60 case 1: return GlobalValue::WeakLinkage; 61 case 2: return GlobalValue::AppendingLinkage; 62 case 3: return GlobalValue::InternalLinkage; 63 case 4: return GlobalValue::LinkOnceLinkage; 64 case 5: return GlobalValue::DLLImportLinkage; 65 case 6: return GlobalValue::DLLExportLinkage; 66 case 7: return GlobalValue::ExternalWeakLinkage; 67 } 68} 69 70static GlobalValue::VisibilityTypes GetDecodedVisibility(unsigned Val) { 71 switch (Val) { 72 default: // Map unknown visibilities to default. 73 case 0: return GlobalValue::DefaultVisibility; 74 case 1: return GlobalValue::HiddenVisibility; 75 case 2: return GlobalValue::ProtectedVisibility; 76 } 77} 78 79static int GetDecodedCastOpcode(unsigned Val) { 80 switch (Val) { 81 default: return -1; 82 case bitc::CAST_TRUNC : return Instruction::Trunc; 83 case bitc::CAST_ZEXT : return Instruction::ZExt; 84 case bitc::CAST_SEXT : return Instruction::SExt; 85 case bitc::CAST_FPTOUI : return Instruction::FPToUI; 86 case bitc::CAST_FPTOSI : return Instruction::FPToSI; 87 case bitc::CAST_UITOFP : return Instruction::UIToFP; 88 case bitc::CAST_SITOFP : return Instruction::SIToFP; 89 case bitc::CAST_FPTRUNC : return Instruction::FPTrunc; 90 case bitc::CAST_FPEXT : return Instruction::FPExt; 91 case bitc::CAST_PTRTOINT: return Instruction::PtrToInt; 92 case bitc::CAST_INTTOPTR: return Instruction::IntToPtr; 93 case bitc::CAST_BITCAST : return Instruction::BitCast; 94 } 95} 96static int GetDecodedBinaryOpcode(unsigned Val, const Type *Ty) { 97 switch (Val) { 98 default: return -1; 99 case bitc::BINOP_ADD: return Instruction::Add; 100 case bitc::BINOP_SUB: return Instruction::Sub; 101 case bitc::BINOP_MUL: return Instruction::Mul; 102 case bitc::BINOP_UDIV: return Instruction::UDiv; 103 case bitc::BINOP_SDIV: 104 return Ty->isFPOrFPVector() ? Instruction::FDiv : Instruction::SDiv; 105 case bitc::BINOP_UREM: return Instruction::URem; 106 case bitc::BINOP_SREM: 107 return Ty->isFPOrFPVector() ? Instruction::FRem : Instruction::SRem; 108 case bitc::BINOP_SHL: return Instruction::Shl; 109 case bitc::BINOP_LSHR: return Instruction::LShr; 110 case bitc::BINOP_ASHR: return Instruction::AShr; 111 case bitc::BINOP_AND: return Instruction::And; 112 case bitc::BINOP_OR: return Instruction::Or; 113 case bitc::BINOP_XOR: return Instruction::Xor; 114 } 115} 116 117 118namespace { 119 /// @brief A class for maintaining the slot number definition 120 /// as a placeholder for the actual definition for forward constants defs. 121 class ConstantPlaceHolder : public ConstantExpr { 122 ConstantPlaceHolder(); // DO NOT IMPLEMENT 123 void operator=(const ConstantPlaceHolder &); // DO NOT IMPLEMENT 124 public: 125 Use Op; 126 explicit ConstantPlaceHolder(const Type *Ty) 127 : ConstantExpr(Ty, Instruction::UserOp1, &Op, 1), 128 Op(UndefValue::get(Type::Int32Ty), this) { 129 } 130 }; 131} 132 133Constant *BitcodeReaderValueList::getConstantFwdRef(unsigned Idx, 134 const Type *Ty) { 135 if (Idx >= size()) { 136 // Insert a bunch of null values. 137 Uses.resize(Idx+1); 138 OperandList = &Uses[0]; 139 NumOperands = Idx+1; 140 } 141 142 if (Value *V = Uses[Idx]) { 143 assert(Ty == V->getType() && "Type mismatch in constant table!"); 144 return cast<Constant>(V); 145 } 146 147 // Create and return a placeholder, which will later be RAUW'd. 148 Constant *C = new ConstantPlaceHolder(Ty); 149 Uses[Idx].init(C, this); 150 return C; 151} 152 153Value *BitcodeReaderValueList::getValueFwdRef(unsigned Idx, const Type *Ty) { 154 if (Idx >= size()) { 155 // Insert a bunch of null values. 156 Uses.resize(Idx+1); 157 OperandList = &Uses[0]; 158 NumOperands = Idx+1; 159 } 160 161 if (Value *V = Uses[Idx]) { 162 assert((Ty == 0 || Ty == V->getType()) && "Type mismatch in value table!"); 163 return V; 164 } 165 166 // No type specified, must be invalid reference. 167 if (Ty == 0) return 0; 168 169 // Create and return a placeholder, which will later be RAUW'd. 170 Value *V = new Argument(Ty); 171 Uses[Idx].init(V, this); 172 return V; 173} 174 175 176const Type *BitcodeReader::getTypeByID(unsigned ID, bool isTypeTable) { 177 // If the TypeID is in range, return it. 178 if (ID < TypeList.size()) 179 return TypeList[ID].get(); 180 if (!isTypeTable) return 0; 181 182 // The type table allows forward references. Push as many Opaque types as 183 // needed to get up to ID. 184 while (TypeList.size() <= ID) 185 TypeList.push_back(OpaqueType::get()); 186 return TypeList.back().get(); 187} 188 189//===----------------------------------------------------------------------===// 190// Functions for parsing blocks from the bitcode file 191//===----------------------------------------------------------------------===// 192 193bool BitcodeReader::ParseParamAttrBlock() { 194 if (Stream.EnterSubBlock(bitc::PARAMATTR_BLOCK_ID)) 195 return Error("Malformed block record"); 196 197 if (!ParamAttrs.empty()) 198 return Error("Multiple PARAMATTR blocks found!"); 199 200 SmallVector<uint64_t, 64> Record; 201 202 ParamAttrsVector Attrs; 203 204 // Read all the records. 205 while (1) { 206 unsigned Code = Stream.ReadCode(); 207 if (Code == bitc::END_BLOCK) { 208 if (Stream.ReadBlockEnd()) 209 return Error("Error at end of PARAMATTR block"); 210 return false; 211 } 212 213 if (Code == bitc::ENTER_SUBBLOCK) { 214 // No known subblocks, always skip them. 215 Stream.ReadSubBlockID(); 216 if (Stream.SkipBlock()) 217 return Error("Malformed block record"); 218 continue; 219 } 220 221 if (Code == bitc::DEFINE_ABBREV) { 222 Stream.ReadAbbrevRecord(); 223 continue; 224 } 225 226 // Read a record. 227 Record.clear(); 228 switch (Stream.ReadRecord(Code, Record)) { 229 default: // Default behavior: ignore. 230 break; 231 case bitc::PARAMATTR_CODE_ENTRY: { // ENTRY: [paramidx0, attr0, ...] 232 if (Record.size() & 1) 233 return Error("Invalid ENTRY record"); 234 235 for (unsigned i = 0, e = Record.size(); i != e; i += 2) { 236 if (Record[i+1] != ParamAttr::None) 237 Attrs.push_back(ParamAttrsWithIndex::get(Record[i], Record[i+1])); 238 } 239 ParamAttrs.push_back(Attrs.empty() ? NULL : ParamAttrsList::get(Attrs)); 240 Attrs.clear(); 241 break; 242 } 243 } 244 } 245} 246 247 248bool BitcodeReader::ParseTypeTable() { 249 if (Stream.EnterSubBlock(bitc::TYPE_BLOCK_ID)) 250 return Error("Malformed block record"); 251 252 if (!TypeList.empty()) 253 return Error("Multiple TYPE_BLOCKs found!"); 254 255 SmallVector<uint64_t, 64> Record; 256 unsigned NumRecords = 0; 257 258 // Read all the records for this type table. 259 while (1) { 260 unsigned Code = Stream.ReadCode(); 261 if (Code == bitc::END_BLOCK) { 262 if (NumRecords != TypeList.size()) 263 return Error("Invalid type forward reference in TYPE_BLOCK"); 264 if (Stream.ReadBlockEnd()) 265 return Error("Error at end of type table block"); 266 return false; 267 } 268 269 if (Code == bitc::ENTER_SUBBLOCK) { 270 // No known subblocks, always skip them. 271 Stream.ReadSubBlockID(); 272 if (Stream.SkipBlock()) 273 return Error("Malformed block record"); 274 continue; 275 } 276 277 if (Code == bitc::DEFINE_ABBREV) { 278 Stream.ReadAbbrevRecord(); 279 continue; 280 } 281 282 // Read a record. 283 Record.clear(); 284 const Type *ResultTy = 0; 285 switch (Stream.ReadRecord(Code, Record)) { 286 default: // Default behavior: unknown type. 287 ResultTy = 0; 288 break; 289 case bitc::TYPE_CODE_NUMENTRY: // TYPE_CODE_NUMENTRY: [numentries] 290 // TYPE_CODE_NUMENTRY contains a count of the number of types in the 291 // type list. This allows us to reserve space. 292 if (Record.size() < 1) 293 return Error("Invalid TYPE_CODE_NUMENTRY record"); 294 TypeList.reserve(Record[0]); 295 continue; 296 case bitc::TYPE_CODE_VOID: // VOID 297 ResultTy = Type::VoidTy; 298 break; 299 case bitc::TYPE_CODE_FLOAT: // FLOAT 300 ResultTy = Type::FloatTy; 301 break; 302 case bitc::TYPE_CODE_DOUBLE: // DOUBLE 303 ResultTy = Type::DoubleTy; 304 break; 305 case bitc::TYPE_CODE_X86_FP80: // X86_FP80 306 ResultTy = Type::X86_FP80Ty; 307 break; 308 case bitc::TYPE_CODE_FP128: // FP128 309 ResultTy = Type::FP128Ty; 310 break; 311 case bitc::TYPE_CODE_PPC_FP128: // PPC_FP128 312 ResultTy = Type::PPC_FP128Ty; 313 break; 314 case bitc::TYPE_CODE_LABEL: // LABEL 315 ResultTy = Type::LabelTy; 316 break; 317 case bitc::TYPE_CODE_OPAQUE: // OPAQUE 318 ResultTy = 0; 319 break; 320 case bitc::TYPE_CODE_INTEGER: // INTEGER: [width] 321 if (Record.size() < 1) 322 return Error("Invalid Integer type record"); 323 324 ResultTy = IntegerType::get(Record[0]); 325 break; 326 case bitc::TYPE_CODE_POINTER: { // POINTER: [pointee type] or 327 // [pointee type, address space] 328 if (Record.size() < 1) 329 return Error("Invalid POINTER type record"); 330 unsigned AddressSpace = 0; 331 if (Record.size() == 2) 332 AddressSpace = Record[1]; 333 ResultTy = PointerType::get(getTypeByID(Record[0], true), AddressSpace); 334 break; 335 } 336 case bitc::TYPE_CODE_FUNCTION: { 337 // FIXME: attrid is dead, remove it in LLVM 3.0 338 // FUNCTION: [vararg, attrid, retty, paramty x N] 339 if (Record.size() < 3) 340 return Error("Invalid FUNCTION type record"); 341 std::vector<const Type*> ArgTys; 342 for (unsigned i = 3, e = Record.size(); i != e; ++i) 343 ArgTys.push_back(getTypeByID(Record[i], true)); 344 345 ResultTy = FunctionType::get(getTypeByID(Record[2], true), ArgTys, 346 Record[0]); 347 break; 348 } 349 case bitc::TYPE_CODE_STRUCT: { // STRUCT: [ispacked, eltty x N] 350 if (Record.size() < 1) 351 return Error("Invalid STRUCT type record"); 352 std::vector<const Type*> EltTys; 353 for (unsigned i = 1, e = Record.size(); i != e; ++i) 354 EltTys.push_back(getTypeByID(Record[i], true)); 355 ResultTy = StructType::get(EltTys, Record[0]); 356 break; 357 } 358 case bitc::TYPE_CODE_ARRAY: // ARRAY: [numelts, eltty] 359 if (Record.size() < 2) 360 return Error("Invalid ARRAY type record"); 361 ResultTy = ArrayType::get(getTypeByID(Record[1], true), Record[0]); 362 break; 363 case bitc::TYPE_CODE_VECTOR: // VECTOR: [numelts, eltty] 364 if (Record.size() < 2) 365 return Error("Invalid VECTOR type record"); 366 ResultTy = VectorType::get(getTypeByID(Record[1], true), Record[0]); 367 break; 368 } 369 370 if (NumRecords == TypeList.size()) { 371 // If this is a new type slot, just append it. 372 TypeList.push_back(ResultTy ? ResultTy : OpaqueType::get()); 373 ++NumRecords; 374 } else if (ResultTy == 0) { 375 // Otherwise, this was forward referenced, so an opaque type was created, 376 // but the result type is actually just an opaque. Leave the one we 377 // created previously. 378 ++NumRecords; 379 } else { 380 // Otherwise, this was forward referenced, so an opaque type was created. 381 // Resolve the opaque type to the real type now. 382 assert(NumRecords < TypeList.size() && "Typelist imbalance"); 383 const OpaqueType *OldTy = cast<OpaqueType>(TypeList[NumRecords++].get()); 384 385 // Don't directly push the new type on the Tab. Instead we want to replace 386 // the opaque type we previously inserted with the new concrete value. The 387 // refinement from the abstract (opaque) type to the new type causes all 388 // uses of the abstract type to use the concrete type (NewTy). This will 389 // also cause the opaque type to be deleted. 390 const_cast<OpaqueType*>(OldTy)->refineAbstractTypeTo(ResultTy); 391 392 // This should have replaced the old opaque type with the new type in the 393 // value table... or with a preexisting type that was already in the 394 // system. Let's just make sure it did. 395 assert(TypeList[NumRecords-1].get() != OldTy && 396 "refineAbstractType didn't work!"); 397 } 398 } 399} 400 401 402bool BitcodeReader::ParseTypeSymbolTable() { 403 if (Stream.EnterSubBlock(bitc::TYPE_SYMTAB_BLOCK_ID)) 404 return Error("Malformed block record"); 405 406 SmallVector<uint64_t, 64> Record; 407 408 // Read all the records for this type table. 409 std::string TypeName; 410 while (1) { 411 unsigned Code = Stream.ReadCode(); 412 if (Code == bitc::END_BLOCK) { 413 if (Stream.ReadBlockEnd()) 414 return Error("Error at end of type symbol table block"); 415 return false; 416 } 417 418 if (Code == bitc::ENTER_SUBBLOCK) { 419 // No known subblocks, always skip them. 420 Stream.ReadSubBlockID(); 421 if (Stream.SkipBlock()) 422 return Error("Malformed block record"); 423 continue; 424 } 425 426 if (Code == bitc::DEFINE_ABBREV) { 427 Stream.ReadAbbrevRecord(); 428 continue; 429 } 430 431 // Read a record. 432 Record.clear(); 433 switch (Stream.ReadRecord(Code, Record)) { 434 default: // Default behavior: unknown type. 435 break; 436 case bitc::TST_CODE_ENTRY: // TST_ENTRY: [typeid, namechar x N] 437 if (ConvertToString(Record, 1, TypeName)) 438 return Error("Invalid TST_ENTRY record"); 439 unsigned TypeID = Record[0]; 440 if (TypeID >= TypeList.size()) 441 return Error("Invalid Type ID in TST_ENTRY record"); 442 443 TheModule->addTypeName(TypeName, TypeList[TypeID].get()); 444 TypeName.clear(); 445 break; 446 } 447 } 448} 449 450bool BitcodeReader::ParseValueSymbolTable() { 451 if (Stream.EnterSubBlock(bitc::VALUE_SYMTAB_BLOCK_ID)) 452 return Error("Malformed block record"); 453 454 SmallVector<uint64_t, 64> Record; 455 456 // Read all the records for this value table. 457 SmallString<128> ValueName; 458 while (1) { 459 unsigned Code = Stream.ReadCode(); 460 if (Code == bitc::END_BLOCK) { 461 if (Stream.ReadBlockEnd()) 462 return Error("Error at end of value symbol table block"); 463 return false; 464 } 465 if (Code == bitc::ENTER_SUBBLOCK) { 466 // No known subblocks, always skip them. 467 Stream.ReadSubBlockID(); 468 if (Stream.SkipBlock()) 469 return Error("Malformed block record"); 470 continue; 471 } 472 473 if (Code == bitc::DEFINE_ABBREV) { 474 Stream.ReadAbbrevRecord(); 475 continue; 476 } 477 478 // Read a record. 479 Record.clear(); 480 switch (Stream.ReadRecord(Code, Record)) { 481 default: // Default behavior: unknown type. 482 break; 483 case bitc::VST_CODE_ENTRY: { // VST_ENTRY: [valueid, namechar x N] 484 if (ConvertToString(Record, 1, ValueName)) 485 return Error("Invalid TST_ENTRY record"); 486 unsigned ValueID = Record[0]; 487 if (ValueID >= ValueList.size()) 488 return Error("Invalid Value ID in VST_ENTRY record"); 489 Value *V = ValueList[ValueID]; 490 491 V->setName(&ValueName[0], ValueName.size()); 492 ValueName.clear(); 493 break; 494 } 495 case bitc::VST_CODE_BBENTRY: { 496 if (ConvertToString(Record, 1, ValueName)) 497 return Error("Invalid VST_BBENTRY record"); 498 BasicBlock *BB = getBasicBlock(Record[0]); 499 if (BB == 0) 500 return Error("Invalid BB ID in VST_BBENTRY record"); 501 502 BB->setName(&ValueName[0], ValueName.size()); 503 ValueName.clear(); 504 break; 505 } 506 } 507 } 508} 509 510/// DecodeSignRotatedValue - Decode a signed value stored with the sign bit in 511/// the LSB for dense VBR encoding. 512static uint64_t DecodeSignRotatedValue(uint64_t V) { 513 if ((V & 1) == 0) 514 return V >> 1; 515 if (V != 1) 516 return -(V >> 1); 517 // There is no such thing as -0 with integers. "-0" really means MININT. 518 return 1ULL << 63; 519} 520 521/// ResolveGlobalAndAliasInits - Resolve all of the initializers for global 522/// values and aliases that we can. 523bool BitcodeReader::ResolveGlobalAndAliasInits() { 524 std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInitWorklist; 525 std::vector<std::pair<GlobalAlias*, unsigned> > AliasInitWorklist; 526 527 GlobalInitWorklist.swap(GlobalInits); 528 AliasInitWorklist.swap(AliasInits); 529 530 while (!GlobalInitWorklist.empty()) { 531 unsigned ValID = GlobalInitWorklist.back().second; 532 if (ValID >= ValueList.size()) { 533 // Not ready to resolve this yet, it requires something later in the file. 534 GlobalInits.push_back(GlobalInitWorklist.back()); 535 } else { 536 if (Constant *C = dyn_cast<Constant>(ValueList[ValID])) 537 GlobalInitWorklist.back().first->setInitializer(C); 538 else 539 return Error("Global variable initializer is not a constant!"); 540 } 541 GlobalInitWorklist.pop_back(); 542 } 543 544 while (!AliasInitWorklist.empty()) { 545 unsigned ValID = AliasInitWorklist.back().second; 546 if (ValID >= ValueList.size()) { 547 AliasInits.push_back(AliasInitWorklist.back()); 548 } else { 549 if (Constant *C = dyn_cast<Constant>(ValueList[ValID])) 550 AliasInitWorklist.back().first->setAliasee(C); 551 else 552 return Error("Alias initializer is not a constant!"); 553 } 554 AliasInitWorklist.pop_back(); 555 } 556 return false; 557} 558 559 560bool BitcodeReader::ParseConstants() { 561 if (Stream.EnterSubBlock(bitc::CONSTANTS_BLOCK_ID)) 562 return Error("Malformed block record"); 563 564 SmallVector<uint64_t, 64> Record; 565 566 // Read all the records for this value table. 567 const Type *CurTy = Type::Int32Ty; 568 unsigned NextCstNo = ValueList.size(); 569 while (1) { 570 unsigned Code = Stream.ReadCode(); 571 if (Code == bitc::END_BLOCK) { 572 if (NextCstNo != ValueList.size()) 573 return Error("Invalid constant reference!"); 574 575 if (Stream.ReadBlockEnd()) 576 return Error("Error at end of constants block"); 577 return false; 578 } 579 580 if (Code == bitc::ENTER_SUBBLOCK) { 581 // No known subblocks, always skip them. 582 Stream.ReadSubBlockID(); 583 if (Stream.SkipBlock()) 584 return Error("Malformed block record"); 585 continue; 586 } 587 588 if (Code == bitc::DEFINE_ABBREV) { 589 Stream.ReadAbbrevRecord(); 590 continue; 591 } 592 593 // Read a record. 594 Record.clear(); 595 Value *V = 0; 596 switch (Stream.ReadRecord(Code, Record)) { 597 default: // Default behavior: unknown constant 598 case bitc::CST_CODE_UNDEF: // UNDEF 599 V = UndefValue::get(CurTy); 600 break; 601 case bitc::CST_CODE_SETTYPE: // SETTYPE: [typeid] 602 if (Record.empty()) 603 return Error("Malformed CST_SETTYPE record"); 604 if (Record[0] >= TypeList.size()) 605 return Error("Invalid Type ID in CST_SETTYPE record"); 606 CurTy = TypeList[Record[0]]; 607 continue; // Skip the ValueList manipulation. 608 case bitc::CST_CODE_NULL: // NULL 609 V = Constant::getNullValue(CurTy); 610 break; 611 case bitc::CST_CODE_INTEGER: // INTEGER: [intval] 612 if (!isa<IntegerType>(CurTy) || Record.empty()) 613 return Error("Invalid CST_INTEGER record"); 614 V = ConstantInt::get(CurTy, DecodeSignRotatedValue(Record[0])); 615 break; 616 case bitc::CST_CODE_WIDE_INTEGER: {// WIDE_INTEGER: [n x intval] 617 if (!isa<IntegerType>(CurTy) || Record.empty()) 618 return Error("Invalid WIDE_INTEGER record"); 619 620 unsigned NumWords = Record.size(); 621 SmallVector<uint64_t, 8> Words; 622 Words.resize(NumWords); 623 for (unsigned i = 0; i != NumWords; ++i) 624 Words[i] = DecodeSignRotatedValue(Record[i]); 625 V = ConstantInt::get(APInt(cast<IntegerType>(CurTy)->getBitWidth(), 626 NumWords, &Words[0])); 627 break; 628 } 629 case bitc::CST_CODE_FLOAT: { // FLOAT: [fpval] 630 if (Record.empty()) 631 return Error("Invalid FLOAT record"); 632 if (CurTy == Type::FloatTy) 633 V = ConstantFP::get(CurTy, APFloat(APInt(32, (uint32_t)Record[0]))); 634 else if (CurTy == Type::DoubleTy) 635 V = ConstantFP::get(CurTy, APFloat(APInt(64, Record[0]))); 636 else if (CurTy == Type::X86_FP80Ty) 637 V = ConstantFP::get(CurTy, APFloat(APInt(80, 2, &Record[0]))); 638 else if (CurTy == Type::FP128Ty) 639 V = ConstantFP::get(CurTy, APFloat(APInt(128, 2, &Record[0]), true)); 640 else if (CurTy == Type::PPC_FP128Ty) 641 V = ConstantFP::get(CurTy, APFloat(APInt(128, 2, &Record[0]))); 642 else 643 V = UndefValue::get(CurTy); 644 break; 645 } 646 647 case bitc::CST_CODE_AGGREGATE: {// AGGREGATE: [n x value number] 648 if (Record.empty()) 649 return Error("Invalid CST_AGGREGATE record"); 650 651 unsigned Size = Record.size(); 652 std::vector<Constant*> Elts; 653 654 if (const StructType *STy = dyn_cast<StructType>(CurTy)) { 655 for (unsigned i = 0; i != Size; ++i) 656 Elts.push_back(ValueList.getConstantFwdRef(Record[i], 657 STy->getElementType(i))); 658 V = ConstantStruct::get(STy, Elts); 659 } else if (const ArrayType *ATy = dyn_cast<ArrayType>(CurTy)) { 660 const Type *EltTy = ATy->getElementType(); 661 for (unsigned i = 0; i != Size; ++i) 662 Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy)); 663 V = ConstantArray::get(ATy, Elts); 664 } else if (const VectorType *VTy = dyn_cast<VectorType>(CurTy)) { 665 const Type *EltTy = VTy->getElementType(); 666 for (unsigned i = 0; i != Size; ++i) 667 Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy)); 668 V = ConstantVector::get(Elts); 669 } else { 670 V = UndefValue::get(CurTy); 671 } 672 break; 673 } 674 case bitc::CST_CODE_STRING: { // STRING: [values] 675 if (Record.empty()) 676 return Error("Invalid CST_AGGREGATE record"); 677 678 const ArrayType *ATy = cast<ArrayType>(CurTy); 679 const Type *EltTy = ATy->getElementType(); 680 681 unsigned Size = Record.size(); 682 std::vector<Constant*> Elts; 683 for (unsigned i = 0; i != Size; ++i) 684 Elts.push_back(ConstantInt::get(EltTy, Record[i])); 685 V = ConstantArray::get(ATy, Elts); 686 break; 687 } 688 case bitc::CST_CODE_CSTRING: { // CSTRING: [values] 689 if (Record.empty()) 690 return Error("Invalid CST_AGGREGATE record"); 691 692 const ArrayType *ATy = cast<ArrayType>(CurTy); 693 const Type *EltTy = ATy->getElementType(); 694 695 unsigned Size = Record.size(); 696 std::vector<Constant*> Elts; 697 for (unsigned i = 0; i != Size; ++i) 698 Elts.push_back(ConstantInt::get(EltTy, Record[i])); 699 Elts.push_back(Constant::getNullValue(EltTy)); 700 V = ConstantArray::get(ATy, Elts); 701 break; 702 } 703 case bitc::CST_CODE_CE_BINOP: { // CE_BINOP: [opcode, opval, opval] 704 if (Record.size() < 3) return Error("Invalid CE_BINOP record"); 705 int Opc = GetDecodedBinaryOpcode(Record[0], CurTy); 706 if (Opc < 0) { 707 V = UndefValue::get(CurTy); // Unknown binop. 708 } else { 709 Constant *LHS = ValueList.getConstantFwdRef(Record[1], CurTy); 710 Constant *RHS = ValueList.getConstantFwdRef(Record[2], CurTy); 711 V = ConstantExpr::get(Opc, LHS, RHS); 712 } 713 break; 714 } 715 case bitc::CST_CODE_CE_CAST: { // CE_CAST: [opcode, opty, opval] 716 if (Record.size() < 3) return Error("Invalid CE_CAST record"); 717 int Opc = GetDecodedCastOpcode(Record[0]); 718 if (Opc < 0) { 719 V = UndefValue::get(CurTy); // Unknown cast. 720 } else { 721 const Type *OpTy = getTypeByID(Record[1]); 722 if (!OpTy) return Error("Invalid CE_CAST record"); 723 Constant *Op = ValueList.getConstantFwdRef(Record[2], OpTy); 724 V = ConstantExpr::getCast(Opc, Op, CurTy); 725 } 726 break; 727 } 728 case bitc::CST_CODE_CE_GEP: { // CE_GEP: [n x operands] 729 if (Record.size() & 1) return Error("Invalid CE_GEP record"); 730 SmallVector<Constant*, 16> Elts; 731 for (unsigned i = 0, e = Record.size(); i != e; i += 2) { 732 const Type *ElTy = getTypeByID(Record[i]); 733 if (!ElTy) return Error("Invalid CE_GEP record"); 734 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], ElTy)); 735 } 736 V = ConstantExpr::getGetElementPtr(Elts[0], &Elts[1], Elts.size()-1); 737 break; 738 } 739 case bitc::CST_CODE_CE_SELECT: // CE_SELECT: [opval#, opval#, opval#] 740 if (Record.size() < 3) return Error("Invalid CE_SELECT record"); 741 V = ConstantExpr::getSelect(ValueList.getConstantFwdRef(Record[0], 742 Type::Int1Ty), 743 ValueList.getConstantFwdRef(Record[1],CurTy), 744 ValueList.getConstantFwdRef(Record[2],CurTy)); 745 break; 746 case bitc::CST_CODE_CE_EXTRACTELT: { // CE_EXTRACTELT: [opty, opval, opval] 747 if (Record.size() < 3) return Error("Invalid CE_EXTRACTELT record"); 748 const VectorType *OpTy = 749 dyn_cast_or_null<VectorType>(getTypeByID(Record[0])); 750 if (OpTy == 0) return Error("Invalid CE_EXTRACTELT record"); 751 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 752 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], 753 OpTy->getElementType()); 754 V = ConstantExpr::getExtractElement(Op0, Op1); 755 break; 756 } 757 case bitc::CST_CODE_CE_INSERTELT: { // CE_INSERTELT: [opval, opval, opval] 758 const VectorType *OpTy = dyn_cast<VectorType>(CurTy); 759 if (Record.size() < 3 || OpTy == 0) 760 return Error("Invalid CE_INSERTELT record"); 761 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); 762 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], 763 OpTy->getElementType()); 764 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], Type::Int32Ty); 765 V = ConstantExpr::getInsertElement(Op0, Op1, Op2); 766 break; 767 } 768 case bitc::CST_CODE_CE_SHUFFLEVEC: { // CE_SHUFFLEVEC: [opval, opval, opval] 769 const VectorType *OpTy = dyn_cast<VectorType>(CurTy); 770 if (Record.size() < 3 || OpTy == 0) 771 return Error("Invalid CE_INSERTELT record"); 772 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); 773 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], OpTy); 774 const Type *ShufTy=VectorType::get(Type::Int32Ty, OpTy->getNumElements()); 775 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], ShufTy); 776 V = ConstantExpr::getShuffleVector(Op0, Op1, Op2); 777 break; 778 } 779 case bitc::CST_CODE_CE_CMP: { // CE_CMP: [opty, opval, opval, pred] 780 if (Record.size() < 4) return Error("Invalid CE_CMP record"); 781 const Type *OpTy = getTypeByID(Record[0]); 782 if (OpTy == 0) return Error("Invalid CE_CMP record"); 783 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 784 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy); 785 786 if (OpTy->isFloatingPoint()) 787 V = ConstantExpr::getFCmp(Record[3], Op0, Op1); 788 else 789 V = ConstantExpr::getICmp(Record[3], Op0, Op1); 790 break; 791 } 792 case bitc::CST_CODE_INLINEASM: { 793 if (Record.size() < 2) return Error("Invalid INLINEASM record"); 794 std::string AsmStr, ConstrStr; 795 bool HasSideEffects = Record[0]; 796 unsigned AsmStrSize = Record[1]; 797 if (2+AsmStrSize >= Record.size()) 798 return Error("Invalid INLINEASM record"); 799 unsigned ConstStrSize = Record[2+AsmStrSize]; 800 if (3+AsmStrSize+ConstStrSize > Record.size()) 801 return Error("Invalid INLINEASM record"); 802 803 for (unsigned i = 0; i != AsmStrSize; ++i) 804 AsmStr += (char)Record[2+i]; 805 for (unsigned i = 0; i != ConstStrSize; ++i) 806 ConstrStr += (char)Record[3+AsmStrSize+i]; 807 const PointerType *PTy = cast<PointerType>(CurTy); 808 V = InlineAsm::get(cast<FunctionType>(PTy->getElementType()), 809 AsmStr, ConstrStr, HasSideEffects); 810 break; 811 } 812 } 813 814 ValueList.AssignValue(V, NextCstNo); 815 ++NextCstNo; 816 } 817} 818 819/// RememberAndSkipFunctionBody - When we see the block for a function body, 820/// remember where it is and then skip it. This lets us lazily deserialize the 821/// functions. 822bool BitcodeReader::RememberAndSkipFunctionBody() { 823 // Get the function we are talking about. 824 if (FunctionsWithBodies.empty()) 825 return Error("Insufficient function protos"); 826 827 Function *Fn = FunctionsWithBodies.back(); 828 FunctionsWithBodies.pop_back(); 829 830 // Save the current stream state. 831 uint64_t CurBit = Stream.GetCurrentBitNo(); 832 DeferredFunctionInfo[Fn] = std::make_pair(CurBit, Fn->getLinkage()); 833 834 // Set the functions linkage to GhostLinkage so we know it is lazily 835 // deserialized. 836 Fn->setLinkage(GlobalValue::GhostLinkage); 837 838 // Skip over the function block for now. 839 if (Stream.SkipBlock()) 840 return Error("Malformed block record"); 841 return false; 842} 843 844bool BitcodeReader::ParseModule(const std::string &ModuleID) { 845 // Reject multiple MODULE_BLOCK's in a single bitstream. 846 if (TheModule) 847 return Error("Multiple MODULE_BLOCKs in same stream"); 848 849 if (Stream.EnterSubBlock(bitc::MODULE_BLOCK_ID)) 850 return Error("Malformed block record"); 851 852 // Otherwise, create the module. 853 TheModule = new Module(ModuleID); 854 855 SmallVector<uint64_t, 64> Record; 856 std::vector<std::string> SectionTable; 857 std::vector<std::string> CollectorTable; 858 859 // Read all the records for this module. 860 while (!Stream.AtEndOfStream()) { 861 unsigned Code = Stream.ReadCode(); 862 if (Code == bitc::END_BLOCK) { 863 if (Stream.ReadBlockEnd()) 864 return Error("Error at end of module block"); 865 866 // Patch the initializers for globals and aliases up. 867 ResolveGlobalAndAliasInits(); 868 if (!GlobalInits.empty() || !AliasInits.empty()) 869 return Error("Malformed global initializer set"); 870 if (!FunctionsWithBodies.empty()) 871 return Error("Too few function bodies found"); 872 873 // Look for intrinsic functions which need to be upgraded at some point 874 for (Module::iterator FI = TheModule->begin(), FE = TheModule->end(); 875 FI != FE; ++FI) { 876 Function* NewFn; 877 if (UpgradeIntrinsicFunction(FI, NewFn)) 878 UpgradedIntrinsics.push_back(std::make_pair(FI, NewFn)); 879 } 880 881 // Force deallocation of memory for these vectors to favor the client that 882 // want lazy deserialization. 883 std::vector<std::pair<GlobalVariable*, unsigned> >().swap(GlobalInits); 884 std::vector<std::pair<GlobalAlias*, unsigned> >().swap(AliasInits); 885 std::vector<Function*>().swap(FunctionsWithBodies); 886 return false; 887 } 888 889 if (Code == bitc::ENTER_SUBBLOCK) { 890 switch (Stream.ReadSubBlockID()) { 891 default: // Skip unknown content. 892 if (Stream.SkipBlock()) 893 return Error("Malformed block record"); 894 break; 895 case bitc::BLOCKINFO_BLOCK_ID: 896 if (Stream.ReadBlockInfoBlock()) 897 return Error("Malformed BlockInfoBlock"); 898 break; 899 case bitc::PARAMATTR_BLOCK_ID: 900 if (ParseParamAttrBlock()) 901 return true; 902 break; 903 case bitc::TYPE_BLOCK_ID: 904 if (ParseTypeTable()) 905 return true; 906 break; 907 case bitc::TYPE_SYMTAB_BLOCK_ID: 908 if (ParseTypeSymbolTable()) 909 return true; 910 break; 911 case bitc::VALUE_SYMTAB_BLOCK_ID: 912 if (ParseValueSymbolTable()) 913 return true; 914 break; 915 case bitc::CONSTANTS_BLOCK_ID: 916 if (ParseConstants() || ResolveGlobalAndAliasInits()) 917 return true; 918 break; 919 case bitc::FUNCTION_BLOCK_ID: 920 // If this is the first function body we've seen, reverse the 921 // FunctionsWithBodies list. 922 if (!HasReversedFunctionsWithBodies) { 923 std::reverse(FunctionsWithBodies.begin(), FunctionsWithBodies.end()); 924 HasReversedFunctionsWithBodies = true; 925 } 926 927 if (RememberAndSkipFunctionBody()) 928 return true; 929 break; 930 } 931 continue; 932 } 933 934 if (Code == bitc::DEFINE_ABBREV) { 935 Stream.ReadAbbrevRecord(); 936 continue; 937 } 938 939 // Read a record. 940 switch (Stream.ReadRecord(Code, Record)) { 941 default: break; // Default behavior, ignore unknown content. 942 case bitc::MODULE_CODE_VERSION: // VERSION: [version#] 943 if (Record.size() < 1) 944 return Error("Malformed MODULE_CODE_VERSION"); 945 // Only version #0 is supported so far. 946 if (Record[0] != 0) 947 return Error("Unknown bitstream version!"); 948 break; 949 case bitc::MODULE_CODE_TRIPLE: { // TRIPLE: [strchr x N] 950 std::string S; 951 if (ConvertToString(Record, 0, S)) 952 return Error("Invalid MODULE_CODE_TRIPLE record"); 953 TheModule->setTargetTriple(S); 954 break; 955 } 956 case bitc::MODULE_CODE_DATALAYOUT: { // DATALAYOUT: [strchr x N] 957 std::string S; 958 if (ConvertToString(Record, 0, S)) 959 return Error("Invalid MODULE_CODE_DATALAYOUT record"); 960 TheModule->setDataLayout(S); 961 break; 962 } 963 case bitc::MODULE_CODE_ASM: { // ASM: [strchr x N] 964 std::string S; 965 if (ConvertToString(Record, 0, S)) 966 return Error("Invalid MODULE_CODE_ASM record"); 967 TheModule->setModuleInlineAsm(S); 968 break; 969 } 970 case bitc::MODULE_CODE_DEPLIB: { // DEPLIB: [strchr x N] 971 std::string S; 972 if (ConvertToString(Record, 0, S)) 973 return Error("Invalid MODULE_CODE_DEPLIB record"); 974 TheModule->addLibrary(S); 975 break; 976 } 977 case bitc::MODULE_CODE_SECTIONNAME: { // SECTIONNAME: [strchr x N] 978 std::string S; 979 if (ConvertToString(Record, 0, S)) 980 return Error("Invalid MODULE_CODE_SECTIONNAME record"); 981 SectionTable.push_back(S); 982 break; 983 } 984 case bitc::MODULE_CODE_COLLECTORNAME: { // SECTIONNAME: [strchr x N] 985 std::string S; 986 if (ConvertToString(Record, 0, S)) 987 return Error("Invalid MODULE_CODE_COLLECTORNAME record"); 988 CollectorTable.push_back(S); 989 break; 990 } 991 // GLOBALVAR: [pointer type, isconst, initid, 992 // linkage, alignment, section, visibility, threadlocal] 993 case bitc::MODULE_CODE_GLOBALVAR: { 994 if (Record.size() < 6) 995 return Error("Invalid MODULE_CODE_GLOBALVAR record"); 996 const Type *Ty = getTypeByID(Record[0]); 997 if (!isa<PointerType>(Ty)) 998 return Error("Global not a pointer type!"); 999 unsigned AddressSpace = cast<PointerType>(Ty)->getAddressSpace(); 1000 Ty = cast<PointerType>(Ty)->getElementType(); 1001 1002 bool isConstant = Record[1]; 1003 GlobalValue::LinkageTypes Linkage = GetDecodedLinkage(Record[3]); 1004 unsigned Alignment = (1 << Record[4]) >> 1; 1005 std::string Section; 1006 if (Record[5]) { 1007 if (Record[5]-1 >= SectionTable.size()) 1008 return Error("Invalid section ID"); 1009 Section = SectionTable[Record[5]-1]; 1010 } 1011 GlobalValue::VisibilityTypes Visibility = GlobalValue::DefaultVisibility; 1012 if (Record.size() > 6) 1013 Visibility = GetDecodedVisibility(Record[6]); 1014 bool isThreadLocal = false; 1015 if (Record.size() > 7) 1016 isThreadLocal = Record[7]; 1017 1018 GlobalVariable *NewGV = 1019 new GlobalVariable(Ty, isConstant, Linkage, 0, "", TheModule, 1020 isThreadLocal, AddressSpace); 1021 NewGV->setAlignment(Alignment); 1022 if (!Section.empty()) 1023 NewGV->setSection(Section); 1024 NewGV->setVisibility(Visibility); 1025 NewGV->setThreadLocal(isThreadLocal); 1026 1027 ValueList.push_back(NewGV); 1028 1029 // Remember which value to use for the global initializer. 1030 if (unsigned InitID = Record[2]) 1031 GlobalInits.push_back(std::make_pair(NewGV, InitID-1)); 1032 break; 1033 } 1034 // FUNCTION: [type, callingconv, isproto, linkage, paramattr, 1035 // alignment, section, visibility, collector] 1036 case bitc::MODULE_CODE_FUNCTION: { 1037 if (Record.size() < 8) 1038 return Error("Invalid MODULE_CODE_FUNCTION record"); 1039 const Type *Ty = getTypeByID(Record[0]); 1040 if (!isa<PointerType>(Ty)) 1041 return Error("Function not a pointer type!"); 1042 const FunctionType *FTy = 1043 dyn_cast<FunctionType>(cast<PointerType>(Ty)->getElementType()); 1044 if (!FTy) 1045 return Error("Function not a pointer to function type!"); 1046 1047 Function *Func = new Function(FTy, GlobalValue::ExternalLinkage, 1048 "", TheModule); 1049 1050 Func->setCallingConv(Record[1]); 1051 bool isProto = Record[2]; 1052 Func->setLinkage(GetDecodedLinkage(Record[3])); 1053 const ParamAttrsList *PAL = getParamAttrs(Record[4]); 1054 Func->setParamAttrs(PAL); 1055 1056 Func->setAlignment((1 << Record[5]) >> 1); 1057 if (Record[6]) { 1058 if (Record[6]-1 >= SectionTable.size()) 1059 return Error("Invalid section ID"); 1060 Func->setSection(SectionTable[Record[6]-1]); 1061 } 1062 Func->setVisibility(GetDecodedVisibility(Record[7])); 1063 if (Record.size() > 8 && Record[8]) { 1064 if (Record[8]-1 > CollectorTable.size()) 1065 return Error("Invalid collector ID"); 1066 Func->setCollector(CollectorTable[Record[8]-1].c_str()); 1067 } 1068 1069 ValueList.push_back(Func); 1070 1071 // If this is a function with a body, remember the prototype we are 1072 // creating now, so that we can match up the body with them later. 1073 if (!isProto) 1074 FunctionsWithBodies.push_back(Func); 1075 break; 1076 } 1077 // ALIAS: [alias type, aliasee val#, linkage] 1078 case bitc::MODULE_CODE_ALIAS: { 1079 if (Record.size() < 3) 1080 return Error("Invalid MODULE_ALIAS record"); 1081 const Type *Ty = getTypeByID(Record[0]); 1082 if (!isa<PointerType>(Ty)) 1083 return Error("Function not a pointer type!"); 1084 1085 GlobalAlias *NewGA = new GlobalAlias(Ty, GetDecodedLinkage(Record[2]), 1086 "", 0, TheModule); 1087 ValueList.push_back(NewGA); 1088 AliasInits.push_back(std::make_pair(NewGA, Record[1])); 1089 break; 1090 } 1091 /// MODULE_CODE_PURGEVALS: [numvals] 1092 case bitc::MODULE_CODE_PURGEVALS: 1093 // Trim down the value list to the specified size. 1094 if (Record.size() < 1 || Record[0] > ValueList.size()) 1095 return Error("Invalid MODULE_PURGEVALS record"); 1096 ValueList.shrinkTo(Record[0]); 1097 break; 1098 } 1099 Record.clear(); 1100 } 1101 1102 return Error("Premature end of bitstream"); 1103} 1104 1105 1106bool BitcodeReader::ParseBitcode() { 1107 TheModule = 0; 1108 1109 if (Buffer->getBufferSize() & 3) 1110 return Error("Bitcode stream should be a multiple of 4 bytes in length"); 1111 1112 unsigned char *BufPtr = (unsigned char *)Buffer->getBufferStart(); 1113 Stream.init(BufPtr, BufPtr+Buffer->getBufferSize()); 1114 1115 // Sniff for the signature. 1116 if (Stream.Read(8) != 'B' || 1117 Stream.Read(8) != 'C' || 1118 Stream.Read(4) != 0x0 || 1119 Stream.Read(4) != 0xC || 1120 Stream.Read(4) != 0xE || 1121 Stream.Read(4) != 0xD) 1122 return Error("Invalid bitcode signature"); 1123 1124 // We expect a number of well-defined blocks, though we don't necessarily 1125 // need to understand them all. 1126 while (!Stream.AtEndOfStream()) { 1127 unsigned Code = Stream.ReadCode(); 1128 1129 if (Code != bitc::ENTER_SUBBLOCK) 1130 return Error("Invalid record at top-level"); 1131 1132 unsigned BlockID = Stream.ReadSubBlockID(); 1133 1134 // We only know the MODULE subblock ID. 1135 switch (BlockID) { 1136 case bitc::BLOCKINFO_BLOCK_ID: 1137 if (Stream.ReadBlockInfoBlock()) 1138 return Error("Malformed BlockInfoBlock"); 1139 break; 1140 case bitc::MODULE_BLOCK_ID: 1141 if (ParseModule(Buffer->getBufferIdentifier())) 1142 return true; 1143 break; 1144 default: 1145 if (Stream.SkipBlock()) 1146 return Error("Malformed block record"); 1147 break; 1148 } 1149 } 1150 1151 return false; 1152} 1153 1154 1155/// ParseFunctionBody - Lazily parse the specified function body block. 1156bool BitcodeReader::ParseFunctionBody(Function *F) { 1157 if (Stream.EnterSubBlock(bitc::FUNCTION_BLOCK_ID)) 1158 return Error("Malformed block record"); 1159 1160 unsigned ModuleValueListSize = ValueList.size(); 1161 1162 // Add all the function arguments to the value table. 1163 for(Function::arg_iterator I = F->arg_begin(), E = F->arg_end(); I != E; ++I) 1164 ValueList.push_back(I); 1165 1166 unsigned NextValueNo = ValueList.size(); 1167 BasicBlock *CurBB = 0; 1168 unsigned CurBBNo = 0; 1169 1170 // Read all the records. 1171 SmallVector<uint64_t, 64> Record; 1172 while (1) { 1173 unsigned Code = Stream.ReadCode(); 1174 if (Code == bitc::END_BLOCK) { 1175 if (Stream.ReadBlockEnd()) 1176 return Error("Error at end of function block"); 1177 break; 1178 } 1179 1180 if (Code == bitc::ENTER_SUBBLOCK) { 1181 switch (Stream.ReadSubBlockID()) { 1182 default: // Skip unknown content. 1183 if (Stream.SkipBlock()) 1184 return Error("Malformed block record"); 1185 break; 1186 case bitc::CONSTANTS_BLOCK_ID: 1187 if (ParseConstants()) return true; 1188 NextValueNo = ValueList.size(); 1189 break; 1190 case bitc::VALUE_SYMTAB_BLOCK_ID: 1191 if (ParseValueSymbolTable()) return true; 1192 break; 1193 } 1194 continue; 1195 } 1196 1197 if (Code == bitc::DEFINE_ABBREV) { 1198 Stream.ReadAbbrevRecord(); 1199 continue; 1200 } 1201 1202 // Read a record. 1203 Record.clear(); 1204 Instruction *I = 0; 1205 switch (Stream.ReadRecord(Code, Record)) { 1206 default: // Default behavior: reject 1207 return Error("Unknown instruction"); 1208 case bitc::FUNC_CODE_DECLAREBLOCKS: // DECLAREBLOCKS: [nblocks] 1209 if (Record.size() < 1 || Record[0] == 0) 1210 return Error("Invalid DECLAREBLOCKS record"); 1211 // Create all the basic blocks for the function. 1212 FunctionBBs.resize(Record[0]); 1213 for (unsigned i = 0, e = FunctionBBs.size(); i != e; ++i) 1214 FunctionBBs[i] = new BasicBlock("", F); 1215 CurBB = FunctionBBs[0]; 1216 continue; 1217 1218 case bitc::FUNC_CODE_INST_BINOP: { // BINOP: [opval, ty, opval, opcode] 1219 unsigned OpNum = 0; 1220 Value *LHS, *RHS; 1221 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) || 1222 getValue(Record, OpNum, LHS->getType(), RHS) || 1223 OpNum+1 != Record.size()) 1224 return Error("Invalid BINOP record"); 1225 1226 int Opc = GetDecodedBinaryOpcode(Record[OpNum], LHS->getType()); 1227 if (Opc == -1) return Error("Invalid BINOP record"); 1228 I = BinaryOperator::create((Instruction::BinaryOps)Opc, LHS, RHS); 1229 break; 1230 } 1231 case bitc::FUNC_CODE_INST_CAST: { // CAST: [opval, opty, destty, castopc] 1232 unsigned OpNum = 0; 1233 Value *Op; 1234 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1235 OpNum+2 != Record.size()) 1236 return Error("Invalid CAST record"); 1237 1238 const Type *ResTy = getTypeByID(Record[OpNum]); 1239 int Opc = GetDecodedCastOpcode(Record[OpNum+1]); 1240 if (Opc == -1 || ResTy == 0) 1241 return Error("Invalid CAST record"); 1242 I = CastInst::create((Instruction::CastOps)Opc, Op, ResTy); 1243 break; 1244 } 1245 case bitc::FUNC_CODE_INST_GEP: { // GEP: [n x operands] 1246 unsigned OpNum = 0; 1247 Value *BasePtr; 1248 if (getValueTypePair(Record, OpNum, NextValueNo, BasePtr)) 1249 return Error("Invalid GEP record"); 1250 1251 SmallVector<Value*, 16> GEPIdx; 1252 while (OpNum != Record.size()) { 1253 Value *Op; 1254 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 1255 return Error("Invalid GEP record"); 1256 GEPIdx.push_back(Op); 1257 } 1258 1259 I = new GetElementPtrInst(BasePtr, GEPIdx.begin(), GEPIdx.end()); 1260 break; 1261 } 1262 1263 case bitc::FUNC_CODE_INST_SELECT: { // SELECT: [opval, ty, opval, opval] 1264 unsigned OpNum = 0; 1265 Value *TrueVal, *FalseVal, *Cond; 1266 if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) || 1267 getValue(Record, OpNum, TrueVal->getType(), FalseVal) || 1268 getValue(Record, OpNum, Type::Int1Ty, Cond)) 1269 return Error("Invalid SELECT record"); 1270 1271 I = new SelectInst(Cond, TrueVal, FalseVal); 1272 break; 1273 } 1274 1275 case bitc::FUNC_CODE_INST_EXTRACTELT: { // EXTRACTELT: [opty, opval, opval] 1276 unsigned OpNum = 0; 1277 Value *Vec, *Idx; 1278 if (getValueTypePair(Record, OpNum, NextValueNo, Vec) || 1279 getValue(Record, OpNum, Type::Int32Ty, Idx)) 1280 return Error("Invalid EXTRACTELT record"); 1281 I = new ExtractElementInst(Vec, Idx); 1282 break; 1283 } 1284 1285 case bitc::FUNC_CODE_INST_INSERTELT: { // INSERTELT: [ty, opval,opval,opval] 1286 unsigned OpNum = 0; 1287 Value *Vec, *Elt, *Idx; 1288 if (getValueTypePair(Record, OpNum, NextValueNo, Vec) || 1289 getValue(Record, OpNum, 1290 cast<VectorType>(Vec->getType())->getElementType(), Elt) || 1291 getValue(Record, OpNum, Type::Int32Ty, Idx)) 1292 return Error("Invalid INSERTELT record"); 1293 I = new InsertElementInst(Vec, Elt, Idx); 1294 break; 1295 } 1296 1297 case bitc::FUNC_CODE_INST_SHUFFLEVEC: {// SHUFFLEVEC: [opval,ty,opval,opval] 1298 unsigned OpNum = 0; 1299 Value *Vec1, *Vec2, *Mask; 1300 if (getValueTypePair(Record, OpNum, NextValueNo, Vec1) || 1301 getValue(Record, OpNum, Vec1->getType(), Vec2)) 1302 return Error("Invalid SHUFFLEVEC record"); 1303 1304 const Type *MaskTy = 1305 VectorType::get(Type::Int32Ty, 1306 cast<VectorType>(Vec1->getType())->getNumElements()); 1307 1308 if (getValue(Record, OpNum, MaskTy, Mask)) 1309 return Error("Invalid SHUFFLEVEC record"); 1310 I = new ShuffleVectorInst(Vec1, Vec2, Mask); 1311 break; 1312 } 1313 1314 case bitc::FUNC_CODE_INST_CMP: { // CMP: [opty, opval, opval, pred] 1315 unsigned OpNum = 0; 1316 Value *LHS, *RHS; 1317 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) || 1318 getValue(Record, OpNum, LHS->getType(), RHS) || 1319 OpNum+1 != Record.size()) 1320 return Error("Invalid CMP record"); 1321 1322 if (LHS->getType()->isFPOrFPVector()) 1323 I = new FCmpInst((FCmpInst::Predicate)Record[OpNum], LHS, RHS); 1324 else 1325 I = new ICmpInst((ICmpInst::Predicate)Record[OpNum], LHS, RHS); 1326 break; 1327 } 1328 case bitc::FUNC_CODE_INST_GETRESULT: { // GETRESULT: [ty, val, n] 1329 if (Record.size() != 2) 1330 return Error("Invalid GETRESULT record"); 1331 unsigned OpNum = 0; 1332 Value *Op; 1333 getValueTypePair(Record, OpNum, NextValueNo, Op); 1334 unsigned Index = Record[1]; 1335 I = new GetResultInst(Op, Index); 1336 break; 1337 } 1338 1339 case bitc::FUNC_CODE_INST_RET: // RET: [opty,opval<optional>] 1340 { 1341 unsigned Size = Record.size(); 1342 if (Size == 0) { 1343 I = new ReturnInst(); 1344 break; 1345 } else if (Size == 1) { 1346 unsigned OpNum = 0; 1347 Value *Op; 1348 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1349 OpNum != Record.size()) 1350 return Error("Invalid RET record"); 1351 I = new ReturnInst(Op); 1352 break; 1353 } else { 1354 std::vector<Value *> Vs; 1355 Value *Op; 1356 unsigned OpNum = 0; 1357 for (unsigned i = 0; i < Size; ++i) { 1358 getValueTypePair(Record, OpNum, NextValueNo, Op); 1359 Vs.push_back(Op); 1360 } 1361 I = new ReturnInst(Vs); 1362 break; 1363 } 1364 } 1365 case bitc::FUNC_CODE_INST_BR: { // BR: [bb#, bb#, opval] or [bb#] 1366 if (Record.size() != 1 && Record.size() != 3) 1367 return Error("Invalid BR record"); 1368 BasicBlock *TrueDest = getBasicBlock(Record[0]); 1369 if (TrueDest == 0) 1370 return Error("Invalid BR record"); 1371 1372 if (Record.size() == 1) 1373 I = new BranchInst(TrueDest); 1374 else { 1375 BasicBlock *FalseDest = getBasicBlock(Record[1]); 1376 Value *Cond = getFnValueByID(Record[2], Type::Int1Ty); 1377 if (FalseDest == 0 || Cond == 0) 1378 return Error("Invalid BR record"); 1379 I = new BranchInst(TrueDest, FalseDest, Cond); 1380 } 1381 break; 1382 } 1383 case bitc::FUNC_CODE_INST_SWITCH: { // SWITCH: [opty, opval, n, n x ops] 1384 if (Record.size() < 3 || (Record.size() & 1) == 0) 1385 return Error("Invalid SWITCH record"); 1386 const Type *OpTy = getTypeByID(Record[0]); 1387 Value *Cond = getFnValueByID(Record[1], OpTy); 1388 BasicBlock *Default = getBasicBlock(Record[2]); 1389 if (OpTy == 0 || Cond == 0 || Default == 0) 1390 return Error("Invalid SWITCH record"); 1391 unsigned NumCases = (Record.size()-3)/2; 1392 SwitchInst *SI = new SwitchInst(Cond, Default, NumCases); 1393 for (unsigned i = 0, e = NumCases; i != e; ++i) { 1394 ConstantInt *CaseVal = 1395 dyn_cast_or_null<ConstantInt>(getFnValueByID(Record[3+i*2], OpTy)); 1396 BasicBlock *DestBB = getBasicBlock(Record[1+3+i*2]); 1397 if (CaseVal == 0 || DestBB == 0) { 1398 delete SI; 1399 return Error("Invalid SWITCH record!"); 1400 } 1401 SI->addCase(CaseVal, DestBB); 1402 } 1403 I = SI; 1404 break; 1405 } 1406 1407 case bitc::FUNC_CODE_INST_INVOKE: { 1408 // INVOKE: [attrs, cc, normBB, unwindBB, fnty, op0,op1,op2, ...] 1409 if (Record.size() < 4) return Error("Invalid INVOKE record"); 1410 const ParamAttrsList *PAL = getParamAttrs(Record[0]); 1411 unsigned CCInfo = Record[1]; 1412 BasicBlock *NormalBB = getBasicBlock(Record[2]); 1413 BasicBlock *UnwindBB = getBasicBlock(Record[3]); 1414 1415 unsigned OpNum = 4; 1416 Value *Callee; 1417 if (getValueTypePair(Record, OpNum, NextValueNo, Callee)) 1418 return Error("Invalid INVOKE record"); 1419 1420 const PointerType *CalleeTy = dyn_cast<PointerType>(Callee->getType()); 1421 const FunctionType *FTy = !CalleeTy ? 0 : 1422 dyn_cast<FunctionType>(CalleeTy->getElementType()); 1423 1424 // Check that the right number of fixed parameters are here. 1425 if (FTy == 0 || NormalBB == 0 || UnwindBB == 0 || 1426 Record.size() < OpNum+FTy->getNumParams()) 1427 return Error("Invalid INVOKE record"); 1428 1429 SmallVector<Value*, 16> Ops; 1430 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) { 1431 Ops.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i))); 1432 if (Ops.back() == 0) return Error("Invalid INVOKE record"); 1433 } 1434 1435 if (!FTy->isVarArg()) { 1436 if (Record.size() != OpNum) 1437 return Error("Invalid INVOKE record"); 1438 } else { 1439 // Read type/value pairs for varargs params. 1440 while (OpNum != Record.size()) { 1441 Value *Op; 1442 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 1443 return Error("Invalid INVOKE record"); 1444 Ops.push_back(Op); 1445 } 1446 } 1447 1448 I = new InvokeInst(Callee, NormalBB, UnwindBB, Ops.begin(), Ops.end()); 1449 cast<InvokeInst>(I)->setCallingConv(CCInfo); 1450 cast<InvokeInst>(I)->setParamAttrs(PAL); 1451 break; 1452 } 1453 case bitc::FUNC_CODE_INST_UNWIND: // UNWIND 1454 I = new UnwindInst(); 1455 break; 1456 case bitc::FUNC_CODE_INST_UNREACHABLE: // UNREACHABLE 1457 I = new UnreachableInst(); 1458 break; 1459 case bitc::FUNC_CODE_INST_PHI: { // PHI: [ty, val0,bb0, ...] 1460 if (Record.size() < 1 || ((Record.size()-1)&1)) 1461 return Error("Invalid PHI record"); 1462 const Type *Ty = getTypeByID(Record[0]); 1463 if (!Ty) return Error("Invalid PHI record"); 1464 1465 PHINode *PN = new PHINode(Ty); 1466 PN->reserveOperandSpace(Record.size()-1); 1467 1468 for (unsigned i = 0, e = Record.size()-1; i != e; i += 2) { 1469 Value *V = getFnValueByID(Record[1+i], Ty); 1470 BasicBlock *BB = getBasicBlock(Record[2+i]); 1471 if (!V || !BB) return Error("Invalid PHI record"); 1472 PN->addIncoming(V, BB); 1473 } 1474 I = PN; 1475 break; 1476 } 1477 1478 case bitc::FUNC_CODE_INST_MALLOC: { // MALLOC: [instty, op, align] 1479 if (Record.size() < 3) 1480 return Error("Invalid MALLOC record"); 1481 const PointerType *Ty = 1482 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1483 Value *Size = getFnValueByID(Record[1], Type::Int32Ty); 1484 unsigned Align = Record[2]; 1485 if (!Ty || !Size) return Error("Invalid MALLOC record"); 1486 I = new MallocInst(Ty->getElementType(), Size, (1 << Align) >> 1); 1487 break; 1488 } 1489 case bitc::FUNC_CODE_INST_FREE: { // FREE: [op, opty] 1490 unsigned OpNum = 0; 1491 Value *Op; 1492 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1493 OpNum != Record.size()) 1494 return Error("Invalid FREE record"); 1495 I = new FreeInst(Op); 1496 break; 1497 } 1498 case bitc::FUNC_CODE_INST_ALLOCA: { // ALLOCA: [instty, op, align] 1499 if (Record.size() < 3) 1500 return Error("Invalid ALLOCA record"); 1501 const PointerType *Ty = 1502 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1503 Value *Size = getFnValueByID(Record[1], Type::Int32Ty); 1504 unsigned Align = Record[2]; 1505 if (!Ty || !Size) return Error("Invalid ALLOCA record"); 1506 I = new AllocaInst(Ty->getElementType(), Size, (1 << Align) >> 1); 1507 break; 1508 } 1509 case bitc::FUNC_CODE_INST_LOAD: { // LOAD: [opty, op, align, vol] 1510 unsigned OpNum = 0; 1511 Value *Op; 1512 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1513 OpNum+2 != Record.size()) 1514 return Error("Invalid LOAD record"); 1515 1516 I = new LoadInst(Op, "", Record[OpNum+1], (1 << Record[OpNum]) >> 1); 1517 break; 1518 } 1519 case bitc::FUNC_CODE_INST_STORE2: { // STORE2:[ptrty, ptr, val, align, vol] 1520 unsigned OpNum = 0; 1521 Value *Val, *Ptr; 1522 if (getValueTypePair(Record, OpNum, NextValueNo, Ptr) || 1523 getValue(Record, OpNum, 1524 cast<PointerType>(Ptr->getType())->getElementType(), Val) || 1525 OpNum+2 != Record.size()) 1526 return Error("Invalid STORE record"); 1527 1528 I = new StoreInst(Val, Ptr, Record[OpNum+1], (1 << Record[OpNum]) >> 1); 1529 break; 1530 } 1531 case bitc::FUNC_CODE_INST_STORE: { // STORE:[val, valty, ptr, align, vol] 1532 // FIXME: Legacy form of store instruction. Should be removed in LLVM 3.0. 1533 unsigned OpNum = 0; 1534 Value *Val, *Ptr; 1535 if (getValueTypePair(Record, OpNum, NextValueNo, Val) || 1536 getValue(Record, OpNum, PointerType::getUnqual(Val->getType()), Ptr)|| 1537 OpNum+2 != Record.size()) 1538 return Error("Invalid STORE record"); 1539 1540 I = new StoreInst(Val, Ptr, Record[OpNum+1], (1 << Record[OpNum]) >> 1); 1541 break; 1542 } 1543 case bitc::FUNC_CODE_INST_CALL: { 1544 // CALL: [paramattrs, cc, fnty, fnid, arg0, arg1...] 1545 if (Record.size() < 3) 1546 return Error("Invalid CALL record"); 1547 1548 const ParamAttrsList *PAL = getParamAttrs(Record[0]); 1549 unsigned CCInfo = Record[1]; 1550 1551 unsigned OpNum = 2; 1552 Value *Callee; 1553 if (getValueTypePair(Record, OpNum, NextValueNo, Callee)) 1554 return Error("Invalid CALL record"); 1555 1556 const PointerType *OpTy = dyn_cast<PointerType>(Callee->getType()); 1557 const FunctionType *FTy = 0; 1558 if (OpTy) FTy = dyn_cast<FunctionType>(OpTy->getElementType()); 1559 if (!FTy || Record.size() < FTy->getNumParams()+OpNum) 1560 return Error("Invalid CALL record"); 1561 1562 SmallVector<Value*, 16> Args; 1563 // Read the fixed params. 1564 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) { 1565 if (FTy->getParamType(i)->getTypeID()==Type::LabelTyID) 1566 Args.push_back(getBasicBlock(Record[OpNum])); 1567 else 1568 Args.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i))); 1569 if (Args.back() == 0) return Error("Invalid CALL record"); 1570 } 1571 1572 // Read type/value pairs for varargs params. 1573 if (!FTy->isVarArg()) { 1574 if (OpNum != Record.size()) 1575 return Error("Invalid CALL record"); 1576 } else { 1577 while (OpNum != Record.size()) { 1578 Value *Op; 1579 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 1580 return Error("Invalid CALL record"); 1581 Args.push_back(Op); 1582 } 1583 } 1584 1585 I = new CallInst(Callee, Args.begin(), Args.end()); 1586 cast<CallInst>(I)->setCallingConv(CCInfo>>1); 1587 cast<CallInst>(I)->setTailCall(CCInfo & 1); 1588 cast<CallInst>(I)->setParamAttrs(PAL); 1589 break; 1590 } 1591 case bitc::FUNC_CODE_INST_VAARG: { // VAARG: [valistty, valist, instty] 1592 if (Record.size() < 3) 1593 return Error("Invalid VAARG record"); 1594 const Type *OpTy = getTypeByID(Record[0]); 1595 Value *Op = getFnValueByID(Record[1], OpTy); 1596 const Type *ResTy = getTypeByID(Record[2]); 1597 if (!OpTy || !Op || !ResTy) 1598 return Error("Invalid VAARG record"); 1599 I = new VAArgInst(Op, ResTy); 1600 break; 1601 } 1602 } 1603 1604 // Add instruction to end of current BB. If there is no current BB, reject 1605 // this file. 1606 if (CurBB == 0) { 1607 delete I; 1608 return Error("Invalid instruction with no BB"); 1609 } 1610 CurBB->getInstList().push_back(I); 1611 1612 // If this was a terminator instruction, move to the next block. 1613 if (isa<TerminatorInst>(I)) { 1614 ++CurBBNo; 1615 CurBB = CurBBNo < FunctionBBs.size() ? FunctionBBs[CurBBNo] : 0; 1616 } 1617 1618 // Non-void values get registered in the value table for future use. 1619 if (I && I->getType() != Type::VoidTy) 1620 ValueList.AssignValue(I, NextValueNo++); 1621 } 1622 1623 // Check the function list for unresolved values. 1624 if (Argument *A = dyn_cast<Argument>(ValueList.back())) { 1625 if (A->getParent() == 0) { 1626 // We found at least one unresolved value. Nuke them all to avoid leaks. 1627 for (unsigned i = ModuleValueListSize, e = ValueList.size(); i != e; ++i){ 1628 if ((A = dyn_cast<Argument>(ValueList.back())) && A->getParent() == 0) { 1629 A->replaceAllUsesWith(UndefValue::get(A->getType())); 1630 delete A; 1631 } 1632 } 1633 return Error("Never resolved value found in function!"); 1634 } 1635 } 1636 1637 // Trim the value list down to the size it was before we parsed this function. 1638 ValueList.shrinkTo(ModuleValueListSize); 1639 std::vector<BasicBlock*>().swap(FunctionBBs); 1640 1641 return false; 1642} 1643 1644//===----------------------------------------------------------------------===// 1645// ModuleProvider implementation 1646//===----------------------------------------------------------------------===// 1647 1648 1649bool BitcodeReader::materializeFunction(Function *F, std::string *ErrInfo) { 1650 // If it already is material, ignore the request. 1651 if (!F->hasNotBeenReadFromBitcode()) return false; 1652 1653 DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator DFII = 1654 DeferredFunctionInfo.find(F); 1655 assert(DFII != DeferredFunctionInfo.end() && "Deferred function not found!"); 1656 1657 // Move the bit stream to the saved position of the deferred function body and 1658 // restore the real linkage type for the function. 1659 Stream.JumpToBit(DFII->second.first); 1660 F->setLinkage((GlobalValue::LinkageTypes)DFII->second.second); 1661 1662 if (ParseFunctionBody(F)) { 1663 if (ErrInfo) *ErrInfo = ErrorString; 1664 return true; 1665 } 1666 1667 // Upgrade any old intrinsic calls in the function. 1668 for (UpgradedIntrinsicMap::iterator I = UpgradedIntrinsics.begin(), 1669 E = UpgradedIntrinsics.end(); I != E; ++I) { 1670 if (I->first != I->second) { 1671 for (Value::use_iterator UI = I->first->use_begin(), 1672 UE = I->first->use_end(); UI != UE; ) { 1673 if (CallInst* CI = dyn_cast<CallInst>(*UI++)) 1674 UpgradeIntrinsicCall(CI, I->second); 1675 } 1676 } 1677 } 1678 1679 return false; 1680} 1681 1682void BitcodeReader::dematerializeFunction(Function *F) { 1683 // If this function isn't materialized, or if it is a proto, this is a noop. 1684 if (F->hasNotBeenReadFromBitcode() || F->isDeclaration()) 1685 return; 1686 1687 assert(DeferredFunctionInfo.count(F) && "No info to read function later?"); 1688 1689 // Just forget the function body, we can remat it later. 1690 F->deleteBody(); 1691 F->setLinkage(GlobalValue::GhostLinkage); 1692} 1693 1694 1695Module *BitcodeReader::materializeModule(std::string *ErrInfo) { 1696 for (DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator I = 1697 DeferredFunctionInfo.begin(), E = DeferredFunctionInfo.end(); I != E; 1698 ++I) { 1699 Function *F = I->first; 1700 if (F->hasNotBeenReadFromBitcode() && 1701 materializeFunction(F, ErrInfo)) 1702 return 0; 1703 } 1704 1705 // Upgrade any intrinsic calls that slipped through (should not happen!) and 1706 // delete the old functions to clean up. We can't do this unless the entire 1707 // module is materialized because there could always be another function body 1708 // with calls to the old function. 1709 for (std::vector<std::pair<Function*, Function*> >::iterator I = 1710 UpgradedIntrinsics.begin(), E = UpgradedIntrinsics.end(); I != E; ++I) { 1711 if (I->first != I->second) { 1712 for (Value::use_iterator UI = I->first->use_begin(), 1713 UE = I->first->use_end(); UI != UE; ) { 1714 if (CallInst* CI = dyn_cast<CallInst>(*UI++)) 1715 UpgradeIntrinsicCall(CI, I->second); 1716 } 1717 ValueList.replaceUsesOfWith(I->first, I->second); 1718 I->first->eraseFromParent(); 1719 } 1720 } 1721 std::vector<std::pair<Function*, Function*> >().swap(UpgradedIntrinsics); 1722 1723 return TheModule; 1724} 1725 1726 1727/// This method is provided by the parent ModuleProvde class and overriden 1728/// here. It simply releases the module from its provided and frees up our 1729/// state. 1730/// @brief Release our hold on the generated module 1731Module *BitcodeReader::releaseModule(std::string *ErrInfo) { 1732 // Since we're losing control of this Module, we must hand it back complete 1733 Module *M = ModuleProvider::releaseModule(ErrInfo); 1734 FreeState(); 1735 return M; 1736} 1737 1738 1739//===----------------------------------------------------------------------===// 1740// External interface 1741//===----------------------------------------------------------------------===// 1742 1743/// getBitcodeModuleProvider - lazy function-at-a-time loading from a file. 1744/// 1745ModuleProvider *llvm::getBitcodeModuleProvider(MemoryBuffer *Buffer, 1746 std::string *ErrMsg) { 1747 BitcodeReader *R = new BitcodeReader(Buffer); 1748 if (R->ParseBitcode()) { 1749 if (ErrMsg) 1750 *ErrMsg = R->getErrorString(); 1751 1752 // Don't let the BitcodeReader dtor delete 'Buffer'. 1753 R->releaseMemoryBuffer(); 1754 delete R; 1755 return 0; 1756 } 1757 return R; 1758} 1759 1760/// ParseBitcodeFile - Read the specified bitcode file, returning the module. 1761/// If an error occurs, return null and fill in *ErrMsg if non-null. 1762Module *llvm::ParseBitcodeFile(MemoryBuffer *Buffer, std::string *ErrMsg){ 1763 BitcodeReader *R; 1764 R = static_cast<BitcodeReader*>(getBitcodeModuleProvider(Buffer, ErrMsg)); 1765 if (!R) return 0; 1766 1767 // Read in the entire module. 1768 Module *M = R->materializeModule(ErrMsg); 1769 1770 // Don't let the BitcodeReader dtor delete 'Buffer', regardless of whether 1771 // there was an error. 1772 R->releaseMemoryBuffer(); 1773 1774 // If there was no error, tell ModuleProvider not to delete it when its dtor 1775 // is run. 1776 if (M) 1777 M = R->releaseModule(ErrMsg); 1778 1779 delete R; 1780 return M; 1781} 1782