BitcodeReader.cpp revision cb3d91b05b36a144dd0f3103ce4fda4cab356ad6
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/ParameterAttributes.h" 21#include "llvm/ADT/SmallString.h" 22#include "llvm/Support/MathExtras.h" 23#include "llvm/Support/MemoryBuffer.h" 24using namespace llvm; 25 26BitcodeReader::~BitcodeReader() { 27 delete Buffer; 28} 29 30//===----------------------------------------------------------------------===// 31// Helper functions to implement forward reference resolution, etc. 32//===----------------------------------------------------------------------===// 33 34/// ConvertToString - Convert a string from a record into an std::string, return 35/// true on failure. 36template<typename StrTy> 37static bool ConvertToString(SmallVector<uint64_t, 64> &Record, unsigned Idx, 38 StrTy &Result) { 39 if (Idx > Record.size()) 40 return true; 41 42 for (unsigned i = Idx, e = Record.size(); i != e; ++i) 43 Result += (char)Record[i]; 44 return false; 45} 46 47static GlobalValue::LinkageTypes GetDecodedLinkage(unsigned Val) { 48 switch (Val) { 49 default: // Map unknown/new linkages to external 50 case 0: return GlobalValue::ExternalLinkage; 51 case 1: return GlobalValue::WeakLinkage; 52 case 2: return GlobalValue::AppendingLinkage; 53 case 3: return GlobalValue::InternalLinkage; 54 case 4: return GlobalValue::LinkOnceLinkage; 55 case 5: return GlobalValue::DLLImportLinkage; 56 case 6: return GlobalValue::DLLExportLinkage; 57 case 7: return GlobalValue::ExternalWeakLinkage; 58 } 59} 60 61static GlobalValue::VisibilityTypes GetDecodedVisibility(unsigned Val) { 62 switch (Val) { 63 default: // Map unknown visibilities to default. 64 case 0: return GlobalValue::DefaultVisibility; 65 case 1: return GlobalValue::HiddenVisibility; 66 case 2: return GlobalValue::ProtectedVisibility; 67 } 68} 69 70static int GetDecodedCastOpcode(unsigned Val) { 71 switch (Val) { 72 default: return -1; 73 case bitc::CAST_TRUNC : return Instruction::Trunc; 74 case bitc::CAST_ZEXT : return Instruction::ZExt; 75 case bitc::CAST_SEXT : return Instruction::SExt; 76 case bitc::CAST_FPTOUI : return Instruction::FPToUI; 77 case bitc::CAST_FPTOSI : return Instruction::FPToSI; 78 case bitc::CAST_UITOFP : return Instruction::UIToFP; 79 case bitc::CAST_SITOFP : return Instruction::SIToFP; 80 case bitc::CAST_FPTRUNC : return Instruction::FPTrunc; 81 case bitc::CAST_FPEXT : return Instruction::FPExt; 82 case bitc::CAST_PTRTOINT: return Instruction::PtrToInt; 83 case bitc::CAST_INTTOPTR: return Instruction::IntToPtr; 84 case bitc::CAST_BITCAST : return Instruction::BitCast; 85 } 86} 87static int GetDecodedBinaryOpcode(unsigned Val, const Type *Ty) { 88 switch (Val) { 89 default: return -1; 90 case bitc::BINOP_ADD: return Instruction::Add; 91 case bitc::BINOP_SUB: return Instruction::Sub; 92 case bitc::BINOP_MUL: return Instruction::Mul; 93 case bitc::BINOP_UDIV: return Instruction::UDiv; 94 case bitc::BINOP_SDIV: 95 return Ty->isFPOrFPVector() ? Instruction::FDiv : Instruction::SDiv; 96 case bitc::BINOP_UREM: return Instruction::URem; 97 case bitc::BINOP_SREM: 98 return Ty->isFPOrFPVector() ? Instruction::FRem : Instruction::SRem; 99 case bitc::BINOP_SHL: return Instruction::Shl; 100 case bitc::BINOP_LSHR: return Instruction::LShr; 101 case bitc::BINOP_ASHR: return Instruction::AShr; 102 case bitc::BINOP_AND: return Instruction::And; 103 case bitc::BINOP_OR: return Instruction::Or; 104 case bitc::BINOP_XOR: return Instruction::Xor; 105 } 106} 107 108 109namespace { 110 /// @brief A class for maintaining the slot number definition 111 /// as a placeholder for the actual definition for forward constants defs. 112 class ConstantPlaceHolder : public ConstantExpr { 113 ConstantPlaceHolder(); // DO NOT IMPLEMENT 114 void operator=(const ConstantPlaceHolder &); // DO NOT IMPLEMENT 115 public: 116 Use Op; 117 ConstantPlaceHolder(const Type *Ty) 118 : ConstantExpr(Ty, Instruction::UserOp1, &Op, 1), 119 Op(UndefValue::get(Type::Int32Ty), this) { 120 } 121 }; 122} 123 124Constant *BitcodeReaderValueList::getConstantFwdRef(unsigned Idx, 125 const Type *Ty) { 126 if (Idx >= size()) { 127 // Insert a bunch of null values. 128 Uses.resize(Idx+1); 129 OperandList = &Uses[0]; 130 NumOperands = Idx+1; 131 } 132 133 if (Value *V = Uses[Idx]) { 134 assert(Ty == V->getType() && "Type mismatch in constant table!"); 135 return cast<Constant>(V); 136 } 137 138 // Create and return a placeholder, which will later be RAUW'd. 139 Constant *C = new ConstantPlaceHolder(Ty); 140 Uses[Idx].init(C, this); 141 return C; 142} 143 144Value *BitcodeReaderValueList::getValueFwdRef(unsigned Idx, const Type *Ty) { 145 if (Idx >= size()) { 146 // Insert a bunch of null values. 147 Uses.resize(Idx+1); 148 OperandList = &Uses[0]; 149 NumOperands = Idx+1; 150 } 151 152 if (Value *V = Uses[Idx]) { 153 assert((Ty == 0 || Ty == V->getType()) && "Type mismatch in value table!"); 154 return V; 155 } 156 157 // No type specified, must be invalid reference. 158 if (Ty == 0) return 0; 159 160 // Create and return a placeholder, which will later be RAUW'd. 161 Value *V = new Argument(Ty); 162 Uses[Idx].init(V, this); 163 return V; 164} 165 166 167const Type *BitcodeReader::getTypeByID(unsigned ID, bool isTypeTable) { 168 // If the TypeID is in range, return it. 169 if (ID < TypeList.size()) 170 return TypeList[ID].get(); 171 if (!isTypeTable) return 0; 172 173 // The type table allows forward references. Push as many Opaque types as 174 // needed to get up to ID. 175 while (TypeList.size() <= ID) 176 TypeList.push_back(OpaqueType::get()); 177 return TypeList.back().get(); 178} 179 180//===----------------------------------------------------------------------===// 181// Functions for parsing blocks from the bitcode file 182//===----------------------------------------------------------------------===// 183 184bool BitcodeReader::ParseParamAttrBlock() { 185 if (Stream.EnterSubBlock(bitc::PARAMATTR_BLOCK_ID)) 186 return Error("Malformed block record"); 187 188 if (!ParamAttrs.empty()) 189 return Error("Multiple PARAMATTR blocks found!"); 190 191 SmallVector<uint64_t, 64> Record; 192 193 ParamAttrsVector Attrs; 194 195 // Read all the records. 196 while (1) { 197 unsigned Code = Stream.ReadCode(); 198 if (Code == bitc::END_BLOCK) { 199 if (Stream.ReadBlockEnd()) 200 return Error("Error at end of PARAMATTR block"); 201 return false; 202 } 203 204 if (Code == bitc::ENTER_SUBBLOCK) { 205 // No known subblocks, always skip them. 206 Stream.ReadSubBlockID(); 207 if (Stream.SkipBlock()) 208 return Error("Malformed block record"); 209 continue; 210 } 211 212 if (Code == bitc::DEFINE_ABBREV) { 213 Stream.ReadAbbrevRecord(); 214 continue; 215 } 216 217 // Read a record. 218 Record.clear(); 219 switch (Stream.ReadRecord(Code, Record)) { 220 default: // Default behavior: ignore. 221 break; 222 case bitc::PARAMATTR_CODE_ENTRY: { // ENTRY: [paramidx0, attr0, ...] 223 if (Record.size() & 1) 224 return Error("Invalid ENTRY record"); 225 226 ParamAttrsWithIndex PAWI; 227 for (unsigned i = 0, e = Record.size(); i != e; i += 2) { 228 PAWI.index = Record[i]; 229 PAWI.attrs = Record[i+1]; 230 Attrs.push_back(PAWI); 231 } 232 ParamAttrs.push_back(ParamAttrsList::get(Attrs)); 233 Attrs.clear(); 234 break; 235 } 236 } 237 } 238} 239 240 241bool BitcodeReader::ParseTypeTable() { 242 if (Stream.EnterSubBlock(bitc::TYPE_BLOCK_ID)) 243 return Error("Malformed block record"); 244 245 if (!TypeList.empty()) 246 return Error("Multiple TYPE_BLOCKs found!"); 247 248 SmallVector<uint64_t, 64> Record; 249 unsigned NumRecords = 0; 250 251 // Read all the records for this type table. 252 while (1) { 253 unsigned Code = Stream.ReadCode(); 254 if (Code == bitc::END_BLOCK) { 255 if (NumRecords != TypeList.size()) 256 return Error("Invalid type forward reference in TYPE_BLOCK"); 257 if (Stream.ReadBlockEnd()) 258 return Error("Error at end of type table block"); 259 return false; 260 } 261 262 if (Code == bitc::ENTER_SUBBLOCK) { 263 // No known subblocks, always skip them. 264 Stream.ReadSubBlockID(); 265 if (Stream.SkipBlock()) 266 return Error("Malformed block record"); 267 continue; 268 } 269 270 if (Code == bitc::DEFINE_ABBREV) { 271 Stream.ReadAbbrevRecord(); 272 continue; 273 } 274 275 // Read a record. 276 Record.clear(); 277 const Type *ResultTy = 0; 278 switch (Stream.ReadRecord(Code, Record)) { 279 default: // Default behavior: unknown type. 280 ResultTy = 0; 281 break; 282 case bitc::TYPE_CODE_NUMENTRY: // TYPE_CODE_NUMENTRY: [numentries] 283 // TYPE_CODE_NUMENTRY contains a count of the number of types in the 284 // type list. This allows us to reserve space. 285 if (Record.size() < 1) 286 return Error("Invalid TYPE_CODE_NUMENTRY record"); 287 TypeList.reserve(Record[0]); 288 continue; 289 case bitc::TYPE_CODE_VOID: // VOID 290 ResultTy = Type::VoidTy; 291 break; 292 case bitc::TYPE_CODE_FLOAT: // FLOAT 293 ResultTy = Type::FloatTy; 294 break; 295 case bitc::TYPE_CODE_DOUBLE: // DOUBLE 296 ResultTy = Type::DoubleTy; 297 break; 298 case bitc::TYPE_CODE_LABEL: // LABEL 299 ResultTy = Type::LabelTy; 300 break; 301 case bitc::TYPE_CODE_OPAQUE: // OPAQUE 302 ResultTy = 0; 303 break; 304 case bitc::TYPE_CODE_INTEGER: // INTEGER: [width] 305 if (Record.size() < 1) 306 return Error("Invalid Integer type record"); 307 308 ResultTy = IntegerType::get(Record[0]); 309 break; 310 case bitc::TYPE_CODE_POINTER: // POINTER: [pointee type] 311 if (Record.size() < 1) 312 return Error("Invalid POINTER type record"); 313 ResultTy = PointerType::get(getTypeByID(Record[0], true)); 314 break; 315 case bitc::TYPE_CODE_FUNCTION: { 316 // FUNCTION: [vararg, attrid, retty, paramty x N] 317 if (Record.size() < 3) 318 return Error("Invalid FUNCTION type record"); 319 std::vector<const Type*> ArgTys; 320 for (unsigned i = 3, e = Record.size(); i != e; ++i) 321 ArgTys.push_back(getTypeByID(Record[i], true)); 322 323 ResultTy = FunctionType::get(getTypeByID(Record[2], true), ArgTys, 324 Record[0], getParamAttrs(Record[1])); 325 break; 326 } 327 case bitc::TYPE_CODE_STRUCT: { // STRUCT: [ispacked, eltty x N] 328 if (Record.size() < 2) 329 return Error("Invalid STRUCT type record"); 330 std::vector<const Type*> EltTys; 331 for (unsigned i = 1, e = Record.size(); i != e; ++i) 332 EltTys.push_back(getTypeByID(Record[i], true)); 333 ResultTy = StructType::get(EltTys, Record[0]); 334 break; 335 } 336 case bitc::TYPE_CODE_ARRAY: // ARRAY: [numelts, eltty] 337 if (Record.size() < 2) 338 return Error("Invalid ARRAY type record"); 339 ResultTy = ArrayType::get(getTypeByID(Record[1], true), Record[0]); 340 break; 341 case bitc::TYPE_CODE_VECTOR: // VECTOR: [numelts, eltty] 342 if (Record.size() < 2) 343 return Error("Invalid VECTOR type record"); 344 ResultTy = VectorType::get(getTypeByID(Record[1], true), Record[0]); 345 break; 346 } 347 348 if (NumRecords == TypeList.size()) { 349 // If this is a new type slot, just append it. 350 TypeList.push_back(ResultTy ? ResultTy : OpaqueType::get()); 351 ++NumRecords; 352 } else if (ResultTy == 0) { 353 // Otherwise, this was forward referenced, so an opaque type was created, 354 // but the result type is actually just an opaque. Leave the one we 355 // created previously. 356 ++NumRecords; 357 } else { 358 // Otherwise, this was forward referenced, so an opaque type was created. 359 // Resolve the opaque type to the real type now. 360 assert(NumRecords < TypeList.size() && "Typelist imbalance"); 361 const OpaqueType *OldTy = cast<OpaqueType>(TypeList[NumRecords++].get()); 362 363 // Don't directly push the new type on the Tab. Instead we want to replace 364 // the opaque type we previously inserted with the new concrete value. The 365 // refinement from the abstract (opaque) type to the new type causes all 366 // uses of the abstract type to use the concrete type (NewTy). This will 367 // also cause the opaque type to be deleted. 368 const_cast<OpaqueType*>(OldTy)->refineAbstractTypeTo(ResultTy); 369 370 // This should have replaced the old opaque type with the new type in the 371 // value table... or with a preexisting type that was already in the 372 // system. Let's just make sure it did. 373 assert(TypeList[NumRecords-1].get() != OldTy && 374 "refineAbstractType didn't work!"); 375 } 376 } 377} 378 379 380bool BitcodeReader::ParseTypeSymbolTable() { 381 if (Stream.EnterSubBlock(bitc::TYPE_SYMTAB_BLOCK_ID)) 382 return Error("Malformed block record"); 383 384 SmallVector<uint64_t, 64> Record; 385 386 // Read all the records for this type table. 387 std::string TypeName; 388 while (1) { 389 unsigned Code = Stream.ReadCode(); 390 if (Code == bitc::END_BLOCK) { 391 if (Stream.ReadBlockEnd()) 392 return Error("Error at end of type symbol table block"); 393 return false; 394 } 395 396 if (Code == bitc::ENTER_SUBBLOCK) { 397 // No known subblocks, always skip them. 398 Stream.ReadSubBlockID(); 399 if (Stream.SkipBlock()) 400 return Error("Malformed block record"); 401 continue; 402 } 403 404 if (Code == bitc::DEFINE_ABBREV) { 405 Stream.ReadAbbrevRecord(); 406 continue; 407 } 408 409 // Read a record. 410 Record.clear(); 411 switch (Stream.ReadRecord(Code, Record)) { 412 default: // Default behavior: unknown type. 413 break; 414 case bitc::TST_CODE_ENTRY: // TST_ENTRY: [typeid, namechar x N] 415 if (ConvertToString(Record, 1, TypeName)) 416 return Error("Invalid TST_ENTRY record"); 417 unsigned TypeID = Record[0]; 418 if (TypeID >= TypeList.size()) 419 return Error("Invalid Type ID in TST_ENTRY record"); 420 421 TheModule->addTypeName(TypeName, TypeList[TypeID].get()); 422 TypeName.clear(); 423 break; 424 } 425 } 426} 427 428bool BitcodeReader::ParseValueSymbolTable() { 429 if (Stream.EnterSubBlock(bitc::VALUE_SYMTAB_BLOCK_ID)) 430 return Error("Malformed block record"); 431 432 SmallVector<uint64_t, 64> Record; 433 434 // Read all the records for this value table. 435 SmallString<128> ValueName; 436 while (1) { 437 unsigned Code = Stream.ReadCode(); 438 if (Code == bitc::END_BLOCK) { 439 if (Stream.ReadBlockEnd()) 440 return Error("Error at end of value symbol table block"); 441 return false; 442 } 443 if (Code == bitc::ENTER_SUBBLOCK) { 444 // No known subblocks, always skip them. 445 Stream.ReadSubBlockID(); 446 if (Stream.SkipBlock()) 447 return Error("Malformed block record"); 448 continue; 449 } 450 451 if (Code == bitc::DEFINE_ABBREV) { 452 Stream.ReadAbbrevRecord(); 453 continue; 454 } 455 456 // Read a record. 457 Record.clear(); 458 switch (Stream.ReadRecord(Code, Record)) { 459 default: // Default behavior: unknown type. 460 break; 461 case bitc::VST_CODE_ENTRY: { // VST_ENTRY: [valueid, namechar x N] 462 if (ConvertToString(Record, 1, ValueName)) 463 return Error("Invalid TST_ENTRY record"); 464 unsigned ValueID = Record[0]; 465 if (ValueID >= ValueList.size()) 466 return Error("Invalid Value ID in VST_ENTRY record"); 467 Value *V = ValueList[ValueID]; 468 469 V->setName(&ValueName[0], ValueName.size()); 470 ValueName.clear(); 471 break; 472 } 473 case bitc::VST_CODE_BBENTRY: { 474 if (ConvertToString(Record, 1, ValueName)) 475 return Error("Invalid VST_BBENTRY record"); 476 BasicBlock *BB = getBasicBlock(Record[0]); 477 if (BB == 0) 478 return Error("Invalid BB ID in VST_BBENTRY record"); 479 480 BB->setName(&ValueName[0], ValueName.size()); 481 ValueName.clear(); 482 break; 483 } 484 } 485 } 486} 487 488/// DecodeSignRotatedValue - Decode a signed value stored with the sign bit in 489/// the LSB for dense VBR encoding. 490static uint64_t DecodeSignRotatedValue(uint64_t V) { 491 if ((V & 1) == 0) 492 return V >> 1; 493 if (V != 1) 494 return -(V >> 1); 495 // There is no such thing as -0 with integers. "-0" really means MININT. 496 return 1ULL << 63; 497} 498 499/// ResolveGlobalAndAliasInits - Resolve all of the initializers for global 500/// values and aliases that we can. 501bool BitcodeReader::ResolveGlobalAndAliasInits() { 502 std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInitWorklist; 503 std::vector<std::pair<GlobalAlias*, unsigned> > AliasInitWorklist; 504 505 GlobalInitWorklist.swap(GlobalInits); 506 AliasInitWorklist.swap(AliasInits); 507 508 while (!GlobalInitWorklist.empty()) { 509 unsigned ValID = GlobalInitWorklist.back().second; 510 if (ValID >= ValueList.size()) { 511 // Not ready to resolve this yet, it requires something later in the file. 512 GlobalInits.push_back(GlobalInitWorklist.back()); 513 } else { 514 if (Constant *C = dyn_cast<Constant>(ValueList[ValID])) 515 GlobalInitWorklist.back().first->setInitializer(C); 516 else 517 return Error("Global variable initializer is not a constant!"); 518 } 519 GlobalInitWorklist.pop_back(); 520 } 521 522 while (!AliasInitWorklist.empty()) { 523 unsigned ValID = AliasInitWorklist.back().second; 524 if (ValID >= ValueList.size()) { 525 AliasInits.push_back(AliasInitWorklist.back()); 526 } else { 527 if (Constant *C = dyn_cast<Constant>(ValueList[ValID])) 528 AliasInitWorklist.back().first->setAliasee(C); 529 else 530 return Error("Alias initializer is not a constant!"); 531 } 532 AliasInitWorklist.pop_back(); 533 } 534 return false; 535} 536 537 538bool BitcodeReader::ParseConstants() { 539 if (Stream.EnterSubBlock(bitc::CONSTANTS_BLOCK_ID)) 540 return Error("Malformed block record"); 541 542 SmallVector<uint64_t, 64> Record; 543 544 // Read all the records for this value table. 545 const Type *CurTy = Type::Int32Ty; 546 unsigned NextCstNo = ValueList.size(); 547 while (1) { 548 unsigned Code = Stream.ReadCode(); 549 if (Code == bitc::END_BLOCK) { 550 if (NextCstNo != ValueList.size()) 551 return Error("Invalid constant reference!"); 552 553 if (Stream.ReadBlockEnd()) 554 return Error("Error at end of constants block"); 555 return false; 556 } 557 558 if (Code == bitc::ENTER_SUBBLOCK) { 559 // No known subblocks, always skip them. 560 Stream.ReadSubBlockID(); 561 if (Stream.SkipBlock()) 562 return Error("Malformed block record"); 563 continue; 564 } 565 566 if (Code == bitc::DEFINE_ABBREV) { 567 Stream.ReadAbbrevRecord(); 568 continue; 569 } 570 571 // Read a record. 572 Record.clear(); 573 Value *V = 0; 574 switch (Stream.ReadRecord(Code, Record)) { 575 default: // Default behavior: unknown constant 576 case bitc::CST_CODE_UNDEF: // UNDEF 577 V = UndefValue::get(CurTy); 578 break; 579 case bitc::CST_CODE_SETTYPE: // SETTYPE: [typeid] 580 if (Record.empty()) 581 return Error("Malformed CST_SETTYPE record"); 582 if (Record[0] >= TypeList.size()) 583 return Error("Invalid Type ID in CST_SETTYPE record"); 584 CurTy = TypeList[Record[0]]; 585 continue; // Skip the ValueList manipulation. 586 case bitc::CST_CODE_NULL: // NULL 587 V = Constant::getNullValue(CurTy); 588 break; 589 case bitc::CST_CODE_INTEGER: // INTEGER: [intval] 590 if (!isa<IntegerType>(CurTy) || Record.empty()) 591 return Error("Invalid CST_INTEGER record"); 592 V = ConstantInt::get(CurTy, DecodeSignRotatedValue(Record[0])); 593 break; 594 case bitc::CST_CODE_WIDE_INTEGER: {// WIDE_INTEGER: [n x intval] 595 if (!isa<IntegerType>(CurTy) || Record.empty()) 596 return Error("Invalid WIDE_INTEGER record"); 597 598 unsigned NumWords = Record.size(); 599 SmallVector<uint64_t, 8> Words; 600 Words.resize(NumWords); 601 for (unsigned i = 0; i != NumWords; ++i) 602 Words[i] = DecodeSignRotatedValue(Record[i]); 603 V = ConstantInt::get(APInt(cast<IntegerType>(CurTy)->getBitWidth(), 604 NumWords, &Words[0])); 605 break; 606 } 607 case bitc::CST_CODE_FLOAT: // FLOAT: [fpval] 608 if (Record.empty()) 609 return Error("Invalid FLOAT record"); 610 if (CurTy == Type::FloatTy) 611 V = ConstantFP::get(CurTy, BitsToFloat(Record[0])); 612 else if (CurTy == Type::DoubleTy) 613 V = ConstantFP::get(CurTy, BitsToDouble(Record[0])); 614 else 615 V = UndefValue::get(CurTy); 616 break; 617 618 case bitc::CST_CODE_AGGREGATE: {// AGGREGATE: [n x value number] 619 if (Record.empty()) 620 return Error("Invalid CST_AGGREGATE record"); 621 622 unsigned Size = Record.size(); 623 std::vector<Constant*> Elts; 624 625 if (const StructType *STy = dyn_cast<StructType>(CurTy)) { 626 for (unsigned i = 0; i != Size; ++i) 627 Elts.push_back(ValueList.getConstantFwdRef(Record[i], 628 STy->getElementType(i))); 629 V = ConstantStruct::get(STy, Elts); 630 } else if (const ArrayType *ATy = dyn_cast<ArrayType>(CurTy)) { 631 const Type *EltTy = ATy->getElementType(); 632 for (unsigned i = 0; i != Size; ++i) 633 Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy)); 634 V = ConstantArray::get(ATy, Elts); 635 } else if (const VectorType *VTy = dyn_cast<VectorType>(CurTy)) { 636 const Type *EltTy = VTy->getElementType(); 637 for (unsigned i = 0; i != Size; ++i) 638 Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy)); 639 V = ConstantVector::get(Elts); 640 } else { 641 V = UndefValue::get(CurTy); 642 } 643 break; 644 } 645 case bitc::CST_CODE_STRING: { // STRING: [values] 646 if (Record.empty()) 647 return Error("Invalid CST_AGGREGATE record"); 648 649 const ArrayType *ATy = cast<ArrayType>(CurTy); 650 const Type *EltTy = ATy->getElementType(); 651 652 unsigned Size = Record.size(); 653 std::vector<Constant*> Elts; 654 for (unsigned i = 0; i != Size; ++i) 655 Elts.push_back(ConstantInt::get(EltTy, Record[i])); 656 V = ConstantArray::get(ATy, Elts); 657 break; 658 } 659 case bitc::CST_CODE_CSTRING: { // CSTRING: [values] 660 if (Record.empty()) 661 return Error("Invalid CST_AGGREGATE record"); 662 663 const ArrayType *ATy = cast<ArrayType>(CurTy); 664 const Type *EltTy = ATy->getElementType(); 665 666 unsigned Size = Record.size(); 667 std::vector<Constant*> Elts; 668 for (unsigned i = 0; i != Size; ++i) 669 Elts.push_back(ConstantInt::get(EltTy, Record[i])); 670 Elts.push_back(Constant::getNullValue(EltTy)); 671 V = ConstantArray::get(ATy, Elts); 672 break; 673 } 674 case bitc::CST_CODE_CE_BINOP: { // CE_BINOP: [opcode, opval, opval] 675 if (Record.size() < 3) return Error("Invalid CE_BINOP record"); 676 int Opc = GetDecodedBinaryOpcode(Record[0], CurTy); 677 if (Opc < 0) { 678 V = UndefValue::get(CurTy); // Unknown binop. 679 } else { 680 Constant *LHS = ValueList.getConstantFwdRef(Record[1], CurTy); 681 Constant *RHS = ValueList.getConstantFwdRef(Record[2], CurTy); 682 V = ConstantExpr::get(Opc, LHS, RHS); 683 } 684 break; 685 } 686 case bitc::CST_CODE_CE_CAST: { // CE_CAST: [opcode, opty, opval] 687 if (Record.size() < 3) return Error("Invalid CE_CAST record"); 688 int Opc = GetDecodedCastOpcode(Record[0]); 689 if (Opc < 0) { 690 V = UndefValue::get(CurTy); // Unknown cast. 691 } else { 692 const Type *OpTy = getTypeByID(Record[1]); 693 Constant *Op = ValueList.getConstantFwdRef(Record[2], OpTy); 694 V = ConstantExpr::getCast(Opc, Op, CurTy); 695 } 696 break; 697 } 698 case bitc::CST_CODE_CE_GEP: { // CE_GEP: [n x operands] 699 if (Record.size() & 1) return Error("Invalid CE_GEP record"); 700 SmallVector<Constant*, 16> Elts; 701 for (unsigned i = 0, e = Record.size(); i != e; i += 2) { 702 const Type *ElTy = getTypeByID(Record[i]); 703 if (!ElTy) return Error("Invalid CE_GEP record"); 704 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], ElTy)); 705 } 706 V = ConstantExpr::getGetElementPtr(Elts[0], &Elts[1], Elts.size()-1); 707 break; 708 } 709 case bitc::CST_CODE_CE_SELECT: // CE_SELECT: [opval#, opval#, opval#] 710 if (Record.size() < 3) return Error("Invalid CE_SELECT record"); 711 V = ConstantExpr::getSelect(ValueList.getConstantFwdRef(Record[0], 712 Type::Int1Ty), 713 ValueList.getConstantFwdRef(Record[1],CurTy), 714 ValueList.getConstantFwdRef(Record[2],CurTy)); 715 break; 716 case bitc::CST_CODE_CE_EXTRACTELT: { // CE_EXTRACTELT: [opty, opval, opval] 717 if (Record.size() < 3) return Error("Invalid CE_EXTRACTELT record"); 718 const VectorType *OpTy = 719 dyn_cast_or_null<VectorType>(getTypeByID(Record[0])); 720 if (OpTy == 0) return Error("Invalid CE_EXTRACTELT record"); 721 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 722 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], 723 OpTy->getElementType()); 724 V = ConstantExpr::getExtractElement(Op0, Op1); 725 break; 726 } 727 case bitc::CST_CODE_CE_INSERTELT: { // CE_INSERTELT: [opval, opval, opval] 728 const VectorType *OpTy = dyn_cast<VectorType>(CurTy); 729 if (Record.size() < 3 || OpTy == 0) 730 return Error("Invalid CE_INSERTELT record"); 731 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); 732 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], 733 OpTy->getElementType()); 734 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], Type::Int32Ty); 735 V = ConstantExpr::getInsertElement(Op0, Op1, Op2); 736 break; 737 } 738 case bitc::CST_CODE_CE_SHUFFLEVEC: { // CE_SHUFFLEVEC: [opval, opval, opval] 739 const VectorType *OpTy = dyn_cast<VectorType>(CurTy); 740 if (Record.size() < 3 || OpTy == 0) 741 return Error("Invalid CE_INSERTELT record"); 742 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); 743 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], OpTy); 744 const Type *ShufTy=VectorType::get(Type::Int32Ty, OpTy->getNumElements()); 745 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], ShufTy); 746 V = ConstantExpr::getShuffleVector(Op0, Op1, Op2); 747 break; 748 } 749 case bitc::CST_CODE_CE_CMP: { // CE_CMP: [opty, opval, opval, pred] 750 if (Record.size() < 4) return Error("Invalid CE_CMP record"); 751 const Type *OpTy = getTypeByID(Record[0]); 752 if (OpTy == 0) return Error("Invalid CE_CMP record"); 753 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 754 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy); 755 756 if (OpTy->isFloatingPoint()) 757 V = ConstantExpr::getFCmp(Record[3], Op0, Op1); 758 else 759 V = ConstantExpr::getICmp(Record[3], Op0, Op1); 760 break; 761 } 762 } 763 764 ValueList.AssignValue(V, NextCstNo); 765 ++NextCstNo; 766 } 767} 768 769/// RememberAndSkipFunctionBody - When we see the block for a function body, 770/// remember where it is and then skip it. This lets us lazily deserialize the 771/// functions. 772bool BitcodeReader::RememberAndSkipFunctionBody() { 773 // Get the function we are talking about. 774 if (FunctionsWithBodies.empty()) 775 return Error("Insufficient function protos"); 776 777 Function *Fn = FunctionsWithBodies.back(); 778 FunctionsWithBodies.pop_back(); 779 780 // Save the current stream state. 781 uint64_t CurBit = Stream.GetCurrentBitNo(); 782 DeferredFunctionInfo[Fn] = std::make_pair(CurBit, Fn->getLinkage()); 783 784 // Set the functions linkage to GhostLinkage so we know it is lazily 785 // deserialized. 786 Fn->setLinkage(GlobalValue::GhostLinkage); 787 788 // Skip over the function block for now. 789 if (Stream.SkipBlock()) 790 return Error("Malformed block record"); 791 return false; 792} 793 794bool BitcodeReader::ParseModule(const std::string &ModuleID) { 795 // Reject multiple MODULE_BLOCK's in a single bitstream. 796 if (TheModule) 797 return Error("Multiple MODULE_BLOCKs in same stream"); 798 799 if (Stream.EnterSubBlock(bitc::MODULE_BLOCK_ID)) 800 return Error("Malformed block record"); 801 802 // Otherwise, create the module. 803 TheModule = new Module(ModuleID); 804 805 SmallVector<uint64_t, 64> Record; 806 std::vector<std::string> SectionTable; 807 808 // Read all the records for this module. 809 while (!Stream.AtEndOfStream()) { 810 unsigned Code = Stream.ReadCode(); 811 if (Code == bitc::END_BLOCK) { 812 if (Stream.ReadBlockEnd()) 813 return Error("Error at end of module block"); 814 815 // Patch the initializers for globals and aliases up. 816 ResolveGlobalAndAliasInits(); 817 if (!GlobalInits.empty() || !AliasInits.empty()) 818 return Error("Malformed global initializer set"); 819 if (!FunctionsWithBodies.empty()) 820 return Error("Too few function bodies found"); 821 822 // Force deallocation of memory for these vectors to favor the client that 823 // want lazy deserialization. 824 std::vector<std::pair<GlobalVariable*, unsigned> >().swap(GlobalInits); 825 std::vector<std::pair<GlobalAlias*, unsigned> >().swap(AliasInits); 826 std::vector<Function*>().swap(FunctionsWithBodies); 827 return false; 828 } 829 830 if (Code == bitc::ENTER_SUBBLOCK) { 831 switch (Stream.ReadSubBlockID()) { 832 default: // Skip unknown content. 833 if (Stream.SkipBlock()) 834 return Error("Malformed block record"); 835 break; 836 case bitc::BLOCKINFO_BLOCK_ID: 837 if (Stream.ReadBlockInfoBlock()) 838 return Error("Malformed BlockInfoBlock"); 839 break; 840 case bitc::PARAMATTR_BLOCK_ID: 841 if (ParseParamAttrBlock()) 842 return true; 843 break; 844 case bitc::TYPE_BLOCK_ID: 845 if (ParseTypeTable()) 846 return true; 847 break; 848 case bitc::TYPE_SYMTAB_BLOCK_ID: 849 if (ParseTypeSymbolTable()) 850 return true; 851 break; 852 case bitc::VALUE_SYMTAB_BLOCK_ID: 853 if (ParseValueSymbolTable()) 854 return true; 855 break; 856 case bitc::CONSTANTS_BLOCK_ID: 857 if (ParseConstants() || ResolveGlobalAndAliasInits()) 858 return true; 859 break; 860 case bitc::FUNCTION_BLOCK_ID: 861 // If this is the first function body we've seen, reverse the 862 // FunctionsWithBodies list. 863 if (!HasReversedFunctionsWithBodies) { 864 std::reverse(FunctionsWithBodies.begin(), FunctionsWithBodies.end()); 865 HasReversedFunctionsWithBodies = true; 866 } 867 868 if (RememberAndSkipFunctionBody()) 869 return true; 870 break; 871 } 872 continue; 873 } 874 875 if (Code == bitc::DEFINE_ABBREV) { 876 Stream.ReadAbbrevRecord(); 877 continue; 878 } 879 880 // Read a record. 881 switch (Stream.ReadRecord(Code, Record)) { 882 default: break; // Default behavior, ignore unknown content. 883 case bitc::MODULE_CODE_VERSION: // VERSION: [version#] 884 if (Record.size() < 1) 885 return Error("Malformed MODULE_CODE_VERSION"); 886 // Only version #0 is supported so far. 887 if (Record[0] != 0) 888 return Error("Unknown bitstream version!"); 889 break; 890 case bitc::MODULE_CODE_TRIPLE: { // TRIPLE: [strchr x N] 891 std::string S; 892 if (ConvertToString(Record, 0, S)) 893 return Error("Invalid MODULE_CODE_TRIPLE record"); 894 TheModule->setTargetTriple(S); 895 break; 896 } 897 case bitc::MODULE_CODE_DATALAYOUT: { // DATALAYOUT: [strchr x N] 898 std::string S; 899 if (ConvertToString(Record, 0, S)) 900 return Error("Invalid MODULE_CODE_DATALAYOUT record"); 901 TheModule->setDataLayout(S); 902 break; 903 } 904 case bitc::MODULE_CODE_ASM: { // ASM: [strchr x N] 905 std::string S; 906 if (ConvertToString(Record, 0, S)) 907 return Error("Invalid MODULE_CODE_ASM record"); 908 TheModule->setModuleInlineAsm(S); 909 break; 910 } 911 case bitc::MODULE_CODE_DEPLIB: { // DEPLIB: [strchr x N] 912 std::string S; 913 if (ConvertToString(Record, 0, S)) 914 return Error("Invalid MODULE_CODE_DEPLIB record"); 915 TheModule->addLibrary(S); 916 break; 917 } 918 case bitc::MODULE_CODE_SECTIONNAME: { // SECTIONNAME: [strchr x N] 919 std::string S; 920 if (ConvertToString(Record, 0, S)) 921 return Error("Invalid MODULE_CODE_SECTIONNAME record"); 922 SectionTable.push_back(S); 923 break; 924 } 925 // GLOBALVAR: [type, isconst, initid, 926 // linkage, alignment, section, visibility, threadlocal] 927 case bitc::MODULE_CODE_GLOBALVAR: { 928 if (Record.size() < 6) 929 return Error("Invalid MODULE_CODE_GLOBALVAR record"); 930 const Type *Ty = getTypeByID(Record[0]); 931 if (!isa<PointerType>(Ty)) 932 return Error("Global not a pointer type!"); 933 Ty = cast<PointerType>(Ty)->getElementType(); 934 935 bool isConstant = Record[1]; 936 GlobalValue::LinkageTypes Linkage = GetDecodedLinkage(Record[3]); 937 unsigned Alignment = (1 << Record[4]) >> 1; 938 std::string Section; 939 if (Record[5]) { 940 if (Record[5]-1 >= SectionTable.size()) 941 return Error("Invalid section ID"); 942 Section = SectionTable[Record[5]-1]; 943 } 944 GlobalValue::VisibilityTypes Visibility = GlobalValue::DefaultVisibility; 945 if (Record.size() >= 6) Visibility = GetDecodedVisibility(Record[6]); 946 bool isThreadLocal = false; 947 if (Record.size() >= 7) isThreadLocal = Record[7]; 948 949 GlobalVariable *NewGV = 950 new GlobalVariable(Ty, isConstant, Linkage, 0, "", TheModule); 951 NewGV->setAlignment(Alignment); 952 if (!Section.empty()) 953 NewGV->setSection(Section); 954 NewGV->setVisibility(Visibility); 955 NewGV->setThreadLocal(isThreadLocal); 956 957 ValueList.push_back(NewGV); 958 959 // Remember which value to use for the global initializer. 960 if (unsigned InitID = Record[2]) 961 GlobalInits.push_back(std::make_pair(NewGV, InitID-1)); 962 break; 963 } 964 // FUNCTION: [type, callingconv, isproto, linkage, alignment, section, 965 // visibility] 966 case bitc::MODULE_CODE_FUNCTION: { 967 if (Record.size() < 7) 968 return Error("Invalid MODULE_CODE_FUNCTION record"); 969 const Type *Ty = getTypeByID(Record[0]); 970 if (!isa<PointerType>(Ty)) 971 return Error("Function not a pointer type!"); 972 const FunctionType *FTy = 973 dyn_cast<FunctionType>(cast<PointerType>(Ty)->getElementType()); 974 if (!FTy) 975 return Error("Function not a pointer to function type!"); 976 977 Function *Func = new Function(FTy, GlobalValue::ExternalLinkage, 978 "", TheModule); 979 980 Func->setCallingConv(Record[1]); 981 bool isProto = Record[2]; 982 Func->setLinkage(GetDecodedLinkage(Record[3])); 983 Func->setAlignment((1 << Record[4]) >> 1); 984 if (Record[5]) { 985 if (Record[5]-1 >= SectionTable.size()) 986 return Error("Invalid section ID"); 987 Func->setSection(SectionTable[Record[5]-1]); 988 } 989 Func->setVisibility(GetDecodedVisibility(Record[6])); 990 991 ValueList.push_back(Func); 992 993 // If this is a function with a body, remember the prototype we are 994 // creating now, so that we can match up the body with them later. 995 if (!isProto) 996 FunctionsWithBodies.push_back(Func); 997 break; 998 } 999 // ALIAS: [alias type, aliasee val#, linkage] 1000 case bitc::MODULE_CODE_ALIAS: { 1001 if (Record.size() < 3) 1002 return Error("Invalid MODULE_ALIAS record"); 1003 const Type *Ty = getTypeByID(Record[0]); 1004 if (!isa<PointerType>(Ty)) 1005 return Error("Function not a pointer type!"); 1006 1007 GlobalAlias *NewGA = new GlobalAlias(Ty, GetDecodedLinkage(Record[2]), 1008 "", 0, TheModule); 1009 ValueList.push_back(NewGA); 1010 AliasInits.push_back(std::make_pair(NewGA, Record[1])); 1011 break; 1012 } 1013 /// MODULE_CODE_PURGEVALS: [numvals] 1014 case bitc::MODULE_CODE_PURGEVALS: 1015 // Trim down the value list to the specified size. 1016 if (Record.size() < 1 || Record[0] > ValueList.size()) 1017 return Error("Invalid MODULE_PURGEVALS record"); 1018 ValueList.shrinkTo(Record[0]); 1019 break; 1020 } 1021 Record.clear(); 1022 } 1023 1024 return Error("Premature end of bitstream"); 1025} 1026 1027 1028bool BitcodeReader::ParseBitcode() { 1029 TheModule = 0; 1030 1031 if (Buffer->getBufferSize() & 3) 1032 return Error("Bitcode stream should be a multiple of 4 bytes in length"); 1033 1034 unsigned char *BufPtr = (unsigned char *)Buffer->getBufferStart(); 1035 Stream.init(BufPtr, BufPtr+Buffer->getBufferSize()); 1036 1037 // Sniff for the signature. 1038 if (Stream.Read(8) != 'B' || 1039 Stream.Read(8) != 'C' || 1040 Stream.Read(4) != 0x0 || 1041 Stream.Read(4) != 0xC || 1042 Stream.Read(4) != 0xE || 1043 Stream.Read(4) != 0xD) 1044 return Error("Invalid bitcode signature"); 1045 1046 // We expect a number of well-defined blocks, though we don't necessarily 1047 // need to understand them all. 1048 while (!Stream.AtEndOfStream()) { 1049 unsigned Code = Stream.ReadCode(); 1050 1051 if (Code != bitc::ENTER_SUBBLOCK) 1052 return Error("Invalid record at top-level"); 1053 1054 unsigned BlockID = Stream.ReadSubBlockID(); 1055 1056 // We only know the MODULE subblock ID. 1057 switch (BlockID) { 1058 case bitc::BLOCKINFO_BLOCK_ID: 1059 if (Stream.ReadBlockInfoBlock()) 1060 return Error("Malformed BlockInfoBlock"); 1061 break; 1062 case bitc::MODULE_BLOCK_ID: 1063 if (ParseModule(Buffer->getBufferIdentifier())) 1064 return true; 1065 break; 1066 default: 1067 if (Stream.SkipBlock()) 1068 return Error("Malformed block record"); 1069 break; 1070 } 1071 } 1072 1073 return false; 1074} 1075 1076 1077bool BitcodeReader::materializeFunction(Function *F, std::string *ErrInfo) { 1078 // If it already is material, ignore the request. 1079 if (!F->hasNotBeenReadFromBytecode()) return false; 1080 1081 DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator DFII = 1082 DeferredFunctionInfo.find(F); 1083 assert(DFII != DeferredFunctionInfo.end() && "Deferred function not found!"); 1084 1085 // Move the bit stream to the saved position of the deferred function body and 1086 // restore the real linkage type for the function. 1087 Stream.JumpToBit(DFII->second.first); 1088 F->setLinkage((GlobalValue::LinkageTypes)DFII->second.second); 1089 DeferredFunctionInfo.erase(DFII); 1090 1091 if (ParseFunctionBody(F)) { 1092 if (ErrInfo) *ErrInfo = ErrorString; 1093 return true; 1094 } 1095 1096 return false; 1097} 1098 1099Module *BitcodeReader::materializeModule(std::string *ErrInfo) { 1100 DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator I = 1101 DeferredFunctionInfo.begin(); 1102 while (!DeferredFunctionInfo.empty()) { 1103 Function *F = (*I++).first; 1104 assert(F->hasNotBeenReadFromBytecode() && 1105 "Deserialized function found in map!"); 1106 if (materializeFunction(F, ErrInfo)) 1107 return 0; 1108 } 1109 return TheModule; 1110} 1111 1112 1113/// ParseFunctionBody - Lazily parse the specified function body block. 1114bool BitcodeReader::ParseFunctionBody(Function *F) { 1115 if (Stream.EnterSubBlock(bitc::FUNCTION_BLOCK_ID)) 1116 return Error("Malformed block record"); 1117 1118 unsigned ModuleValueListSize = ValueList.size(); 1119 1120 // Add all the function arguments to the value table. 1121 for(Function::arg_iterator I = F->arg_begin(), E = F->arg_end(); I != E; ++I) 1122 ValueList.push_back(I); 1123 1124 unsigned NextValueNo = ValueList.size(); 1125 BasicBlock *CurBB = 0; 1126 unsigned CurBBNo = 0; 1127 1128 // Read all the records. 1129 SmallVector<uint64_t, 64> Record; 1130 while (1) { 1131 unsigned Code = Stream.ReadCode(); 1132 if (Code == bitc::END_BLOCK) { 1133 if (Stream.ReadBlockEnd()) 1134 return Error("Error at end of function block"); 1135 break; 1136 } 1137 1138 if (Code == bitc::ENTER_SUBBLOCK) { 1139 switch (Stream.ReadSubBlockID()) { 1140 default: // Skip unknown content. 1141 if (Stream.SkipBlock()) 1142 return Error("Malformed block record"); 1143 break; 1144 case bitc::CONSTANTS_BLOCK_ID: 1145 if (ParseConstants()) return true; 1146 NextValueNo = ValueList.size(); 1147 break; 1148 case bitc::VALUE_SYMTAB_BLOCK_ID: 1149 if (ParseValueSymbolTable()) return true; 1150 break; 1151 } 1152 continue; 1153 } 1154 1155 if (Code == bitc::DEFINE_ABBREV) { 1156 Stream.ReadAbbrevRecord(); 1157 continue; 1158 } 1159 1160 // Read a record. 1161 Record.clear(); 1162 Instruction *I = 0; 1163 switch (Stream.ReadRecord(Code, Record)) { 1164 default: // Default behavior: reject 1165 return Error("Unknown instruction"); 1166 case bitc::FUNC_CODE_DECLAREBLOCKS: // DECLAREBLOCKS: [nblocks] 1167 if (Record.size() < 1 || Record[0] == 0) 1168 return Error("Invalid DECLAREBLOCKS record"); 1169 // Create all the basic blocks for the function. 1170 FunctionBBs.resize(Record[0]); 1171 for (unsigned i = 0, e = FunctionBBs.size(); i != e; ++i) 1172 FunctionBBs[i] = new BasicBlock("", F); 1173 CurBB = FunctionBBs[0]; 1174 continue; 1175 1176 case bitc::FUNC_CODE_INST_BINOP: { // BINOP: [opval, ty, opval, opcode] 1177 unsigned OpNum = 0; 1178 Value *LHS, *RHS; 1179 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) || 1180 getValue(Record, OpNum, LHS->getType(), RHS) || 1181 OpNum+1 != Record.size()) 1182 return Error("Invalid BINOP record"); 1183 1184 int Opc = GetDecodedBinaryOpcode(Record[OpNum], LHS->getType()); 1185 if (Opc == -1) return Error("Invalid BINOP record"); 1186 I = BinaryOperator::create((Instruction::BinaryOps)Opc, LHS, RHS); 1187 break; 1188 } 1189 case bitc::FUNC_CODE_INST_CAST: { // CAST: [opval, opty, destty, castopc] 1190 unsigned OpNum = 0; 1191 Value *Op; 1192 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1193 OpNum+2 != Record.size()) 1194 return Error("Invalid CAST record"); 1195 1196 const Type *ResTy = getTypeByID(Record[OpNum]); 1197 int Opc = GetDecodedCastOpcode(Record[OpNum+1]); 1198 if (Opc == -1 || ResTy == 0) 1199 return Error("Invalid CAST record"); 1200 I = CastInst::create((Instruction::CastOps)Opc, Op, ResTy); 1201 break; 1202 } 1203 case bitc::FUNC_CODE_INST_GEP: { // GEP: [n x operands] 1204 unsigned OpNum = 0; 1205 Value *BasePtr; 1206 if (getValueTypePair(Record, OpNum, NextValueNo, BasePtr)) 1207 return Error("Invalid GEP record"); 1208 1209 SmallVector<Value*, 16> GEPIdx; 1210 while (OpNum != Record.size()) { 1211 Value *Op; 1212 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 1213 return Error("Invalid GEP record"); 1214 GEPIdx.push_back(Op); 1215 } 1216 1217 I = new GetElementPtrInst(BasePtr, &GEPIdx[0], GEPIdx.size()); 1218 break; 1219 } 1220 1221 case bitc::FUNC_CODE_INST_SELECT: { // SELECT: [opval, ty, opval, opval] 1222 unsigned OpNum = 0; 1223 Value *TrueVal, *FalseVal, *Cond; 1224 if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) || 1225 getValue(Record, OpNum, TrueVal->getType(), FalseVal) || 1226 getValue(Record, OpNum, Type::Int1Ty, Cond)) 1227 return Error("Invalid SELECT record"); 1228 1229 I = new SelectInst(Cond, TrueVal, FalseVal); 1230 break; 1231 } 1232 1233 case bitc::FUNC_CODE_INST_EXTRACTELT: { // EXTRACTELT: [opty, opval, opval] 1234 unsigned OpNum = 0; 1235 Value *Vec, *Idx; 1236 if (getValueTypePair(Record, OpNum, NextValueNo, Vec) || 1237 getValue(Record, OpNum, Type::Int32Ty, Idx)) 1238 return Error("Invalid EXTRACTELT record"); 1239 I = new ExtractElementInst(Vec, Idx); 1240 break; 1241 } 1242 1243 case bitc::FUNC_CODE_INST_INSERTELT: { // INSERTELT: [ty, opval,opval,opval] 1244 unsigned OpNum = 0; 1245 Value *Vec, *Elt, *Idx; 1246 if (getValueTypePair(Record, OpNum, NextValueNo, Vec) || 1247 getValue(Record, OpNum, 1248 cast<VectorType>(Vec->getType())->getElementType(), Elt) || 1249 getValue(Record, OpNum, Type::Int32Ty, Idx)) 1250 return Error("Invalid INSERTELT record"); 1251 I = new InsertElementInst(Vec, Elt, Idx); 1252 break; 1253 } 1254 1255 case bitc::FUNC_CODE_INST_SHUFFLEVEC: {// SHUFFLEVEC: [opval,ty,opval,opval] 1256 unsigned OpNum = 0; 1257 Value *Vec1, *Vec2, *Mask; 1258 if (getValueTypePair(Record, OpNum, NextValueNo, Vec1) || 1259 getValue(Record, OpNum, Vec1->getType(), Vec2)) 1260 return Error("Invalid SHUFFLEVEC record"); 1261 1262 const Type *MaskTy = 1263 VectorType::get(Type::Int32Ty, 1264 cast<VectorType>(Vec1->getType())->getNumElements()); 1265 1266 if (getValue(Record, OpNum, MaskTy, Mask)) 1267 return Error("Invalid SHUFFLEVEC record"); 1268 I = new ShuffleVectorInst(Vec1, Vec2, Mask); 1269 break; 1270 } 1271 1272 case bitc::FUNC_CODE_INST_CMP: { // CMP: [opty, opval, opval, pred] 1273 unsigned OpNum = 0; 1274 Value *LHS, *RHS; 1275 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) || 1276 getValue(Record, OpNum, LHS->getType(), RHS) || 1277 OpNum+1 != Record.size()) 1278 return Error("Invalid CMP record"); 1279 1280 if (LHS->getType()->isFPOrFPVector()) 1281 I = new FCmpInst((FCmpInst::Predicate)Record[OpNum], LHS, RHS); 1282 else 1283 I = new ICmpInst((ICmpInst::Predicate)Record[OpNum], LHS, RHS); 1284 break; 1285 } 1286 1287 case bitc::FUNC_CODE_INST_RET: // RET: [opty,opval<optional>] 1288 if (Record.size() == 0) { 1289 I = new ReturnInst(); 1290 break; 1291 } else { 1292 unsigned OpNum = 0; 1293 Value *Op; 1294 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1295 OpNum != Record.size()) 1296 return Error("Invalid RET record"); 1297 I = new ReturnInst(Op); 1298 break; 1299 } 1300 case bitc::FUNC_CODE_INST_BR: { // BR: [bb#, bb#, opval] or [bb#] 1301 if (Record.size() != 1 && Record.size() != 3) 1302 return Error("Invalid BR record"); 1303 BasicBlock *TrueDest = getBasicBlock(Record[0]); 1304 if (TrueDest == 0) 1305 return Error("Invalid BR record"); 1306 1307 if (Record.size() == 1) 1308 I = new BranchInst(TrueDest); 1309 else { 1310 BasicBlock *FalseDest = getBasicBlock(Record[1]); 1311 Value *Cond = getFnValueByID(Record[2], Type::Int1Ty); 1312 if (FalseDest == 0 || Cond == 0) 1313 return Error("Invalid BR record"); 1314 I = new BranchInst(TrueDest, FalseDest, Cond); 1315 } 1316 break; 1317 } 1318 case bitc::FUNC_CODE_INST_SWITCH: { // SWITCH: [opty, opval, n, n x ops] 1319 if (Record.size() < 3 || (Record.size() & 1) == 0) 1320 return Error("Invalid SWITCH record"); 1321 const Type *OpTy = getTypeByID(Record[0]); 1322 Value *Cond = getFnValueByID(Record[1], OpTy); 1323 BasicBlock *Default = getBasicBlock(Record[2]); 1324 if (OpTy == 0 || Cond == 0 || Default == 0) 1325 return Error("Invalid SWITCH record"); 1326 unsigned NumCases = (Record.size()-3)/2; 1327 SwitchInst *SI = new SwitchInst(Cond, Default, NumCases); 1328 for (unsigned i = 0, e = NumCases; i != e; ++i) { 1329 ConstantInt *CaseVal = 1330 dyn_cast_or_null<ConstantInt>(getFnValueByID(Record[3+i*2], OpTy)); 1331 BasicBlock *DestBB = getBasicBlock(Record[1+3+i*2]); 1332 if (CaseVal == 0 || DestBB == 0) { 1333 delete SI; 1334 return Error("Invalid SWITCH record!"); 1335 } 1336 SI->addCase(CaseVal, DestBB); 1337 } 1338 I = SI; 1339 break; 1340 } 1341 1342 case bitc::FUNC_CODE_INST_INVOKE: { // INVOKE: [cc,fnty, op0,op1,op2, ...] 1343 if (Record.size() < 3) return Error("Invalid INVOKE record"); 1344 unsigned CCInfo = Record[0]; 1345 BasicBlock *NormalBB = getBasicBlock(Record[1]); 1346 BasicBlock *UnwindBB = getBasicBlock(Record[2]); 1347 1348 unsigned OpNum = 3; 1349 Value *Callee; 1350 if (getValueTypePair(Record, OpNum, NextValueNo, Callee)) 1351 return Error("Invalid INVOKE record"); 1352 1353 const PointerType *CalleeTy = dyn_cast<PointerType>(Callee->getType()); 1354 const FunctionType *FTy = !CalleeTy ? 0 : 1355 dyn_cast<FunctionType>(CalleeTy->getElementType()); 1356 1357 // Check that the right number of fixed parameters are here. 1358 if (FTy == 0 || NormalBB == 0 || UnwindBB == 0 || 1359 Record.size() < OpNum+FTy->getNumParams()) 1360 return Error("Invalid INVOKE record"); 1361 1362 SmallVector<Value*, 16> Ops; 1363 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) { 1364 Ops.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i))); 1365 if (Ops.back() == 0) return Error("Invalid INVOKE record"); 1366 } 1367 1368 if (!FTy->isVarArg()) { 1369 if (Record.size() != OpNum) 1370 return Error("Invalid INVOKE record"); 1371 } else { 1372 // Read type/value pairs for varargs params. 1373 while (OpNum != Record.size()) { 1374 Value *Op; 1375 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 1376 return Error("Invalid INVOKE record"); 1377 Ops.push_back(Op); 1378 } 1379 } 1380 1381 I = new InvokeInst(Callee, NormalBB, UnwindBB, &Ops[0], Ops.size()); 1382 cast<InvokeInst>(I)->setCallingConv(CCInfo); 1383 break; 1384 } 1385 case bitc::FUNC_CODE_INST_UNWIND: // UNWIND 1386 I = new UnwindInst(); 1387 break; 1388 case bitc::FUNC_CODE_INST_UNREACHABLE: // UNREACHABLE 1389 I = new UnreachableInst(); 1390 break; 1391 case bitc::FUNC_CODE_INST_PHI: { // PHI: [ty, val0,bb0, ...] 1392 if (Record.size() < 1 || ((Record.size()-1)&1)) 1393 return Error("Invalid PHI record"); 1394 const Type *Ty = getTypeByID(Record[0]); 1395 if (!Ty) return Error("Invalid PHI record"); 1396 1397 PHINode *PN = new PHINode(Ty); 1398 PN->reserveOperandSpace(Record.size()-1); 1399 1400 for (unsigned i = 0, e = Record.size()-1; i != e; i += 2) { 1401 Value *V = getFnValueByID(Record[1+i], Ty); 1402 BasicBlock *BB = getBasicBlock(Record[2+i]); 1403 if (!V || !BB) return Error("Invalid PHI record"); 1404 PN->addIncoming(V, BB); 1405 } 1406 I = PN; 1407 break; 1408 } 1409 1410 case bitc::FUNC_CODE_INST_MALLOC: { // MALLOC: [instty, op, align] 1411 if (Record.size() < 3) 1412 return Error("Invalid MALLOC record"); 1413 const PointerType *Ty = 1414 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1415 Value *Size = getFnValueByID(Record[1], Type::Int32Ty); 1416 unsigned Align = Record[2]; 1417 if (!Ty || !Size) return Error("Invalid MALLOC record"); 1418 I = new MallocInst(Ty->getElementType(), Size, (1 << Align) >> 1); 1419 break; 1420 } 1421 case bitc::FUNC_CODE_INST_FREE: { // FREE: [op, opty] 1422 unsigned OpNum = 0; 1423 Value *Op; 1424 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1425 OpNum != Record.size()) 1426 return Error("Invalid FREE record"); 1427 I = new FreeInst(Op); 1428 break; 1429 } 1430 case bitc::FUNC_CODE_INST_ALLOCA: { // ALLOCA: [instty, op, align] 1431 if (Record.size() < 3) 1432 return Error("Invalid ALLOCA record"); 1433 const PointerType *Ty = 1434 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1435 Value *Size = getFnValueByID(Record[1], Type::Int32Ty); 1436 unsigned Align = Record[2]; 1437 if (!Ty || !Size) return Error("Invalid ALLOCA record"); 1438 I = new AllocaInst(Ty->getElementType(), Size, (1 << Align) >> 1); 1439 break; 1440 } 1441 case bitc::FUNC_CODE_INST_LOAD: { // LOAD: [opty, op, align, vol] 1442 unsigned OpNum = 0; 1443 Value *Op; 1444 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1445 OpNum+2 != Record.size()) 1446 return Error("Invalid LOAD record"); 1447 1448 I = new LoadInst(Op, "", Record[OpNum+1], (1 << Record[OpNum]) >> 1); 1449 break; 1450 } 1451 case bitc::FUNC_CODE_INST_STORE: { // STORE:[val, valty, ptr, align, vol] 1452 unsigned OpNum = 0; 1453 Value *Val, *Ptr; 1454 if (getValueTypePair(Record, OpNum, NextValueNo, Val) || 1455 getValue(Record, OpNum, PointerType::get(Val->getType()), Ptr) || 1456 OpNum+2 != Record.size()) 1457 return Error("Invalid STORE record"); 1458 1459 I = new StoreInst(Val, Ptr, Record[OpNum+1], (1 << Record[OpNum]) >> 1); 1460 break; 1461 } 1462 case bitc::FUNC_CODE_INST_CALL: { // CALL: [cc, fnty, fnid, arg0, arg1...] 1463 if (Record.size() < 1) 1464 return Error("Invalid CALL record"); 1465 unsigned CCInfo = Record[0]; 1466 1467 unsigned OpNum = 1; 1468 Value *Callee; 1469 if (getValueTypePair(Record, OpNum, NextValueNo, Callee)) 1470 return Error("Invalid CALL record"); 1471 1472 const PointerType *OpTy = dyn_cast<PointerType>(Callee->getType()); 1473 const FunctionType *FTy = 0; 1474 if (OpTy) FTy = dyn_cast<FunctionType>(OpTy->getElementType()); 1475 if (!FTy || Record.size() < FTy->getNumParams()+OpNum) 1476 return Error("Invalid CALL record"); 1477 1478 SmallVector<Value*, 16> Args; 1479 // Read the fixed params. 1480 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) { 1481 Args.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i))); 1482 if (Args.back() == 0) return Error("Invalid CALL record"); 1483 } 1484 1485 // Read type/value pairs for varargs params. 1486 if (!FTy->isVarArg()) { 1487 if (OpNum != Record.size()) 1488 return Error("Invalid CALL record"); 1489 } else { 1490 while (OpNum != Record.size()) { 1491 Value *Op; 1492 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 1493 return Error("Invalid CALL record"); 1494 Args.push_back(Op); 1495 } 1496 } 1497 1498 I = new CallInst(Callee, &Args[0], Args.size()); 1499 cast<CallInst>(I)->setCallingConv(CCInfo>>1); 1500 cast<CallInst>(I)->setTailCall(CCInfo & 1); 1501 break; 1502 } 1503 case bitc::FUNC_CODE_INST_VAARG: { // VAARG: [valistty, valist, instty] 1504 if (Record.size() < 3) 1505 return Error("Invalid VAARG record"); 1506 const Type *OpTy = getTypeByID(Record[0]); 1507 Value *Op = getFnValueByID(Record[1], OpTy); 1508 const Type *ResTy = getTypeByID(Record[2]); 1509 if (!OpTy || !Op || !ResTy) 1510 return Error("Invalid VAARG record"); 1511 I = new VAArgInst(Op, ResTy); 1512 break; 1513 } 1514 } 1515 1516 // Add instruction to end of current BB. If there is no current BB, reject 1517 // this file. 1518 if (CurBB == 0) { 1519 delete I; 1520 return Error("Invalid instruction with no BB"); 1521 } 1522 CurBB->getInstList().push_back(I); 1523 1524 // If this was a terminator instruction, move to the next block. 1525 if (isa<TerminatorInst>(I)) { 1526 ++CurBBNo; 1527 CurBB = CurBBNo < FunctionBBs.size() ? FunctionBBs[CurBBNo] : 0; 1528 } 1529 1530 // Non-void values get registered in the value table for future use. 1531 if (I && I->getType() != Type::VoidTy) 1532 ValueList.AssignValue(I, NextValueNo++); 1533 } 1534 1535 // Check the function list for unresolved values. 1536 if (Argument *A = dyn_cast<Argument>(ValueList.back())) { 1537 if (A->getParent() == 0) { 1538 // We found at least one unresolved value. Nuke them all to avoid leaks. 1539 for (unsigned i = ModuleValueListSize, e = ValueList.size(); i != e; ++i){ 1540 if ((A = dyn_cast<Argument>(ValueList.back())) && A->getParent() == 0) { 1541 A->replaceAllUsesWith(UndefValue::get(A->getType())); 1542 delete A; 1543 } 1544 } 1545 return Error("Never resolved value found in function!"); 1546 } 1547 } 1548 1549 // Trim the value list down to the size it was before we parsed this function. 1550 ValueList.shrinkTo(ModuleValueListSize); 1551 std::vector<BasicBlock*>().swap(FunctionBBs); 1552 1553 return false; 1554} 1555 1556 1557//===----------------------------------------------------------------------===// 1558// External interface 1559//===----------------------------------------------------------------------===// 1560 1561/// getBitcodeModuleProvider - lazy function-at-a-time loading from a file. 1562/// 1563ModuleProvider *llvm::getBitcodeModuleProvider(MemoryBuffer *Buffer, 1564 std::string *ErrMsg) { 1565 BitcodeReader *R = new BitcodeReader(Buffer); 1566 if (R->ParseBitcode()) { 1567 if (ErrMsg) 1568 *ErrMsg = R->getErrorString(); 1569 1570 // Don't let the BitcodeReader dtor delete 'Buffer'. 1571 R->releaseMemoryBuffer(); 1572 delete R; 1573 return 0; 1574 } 1575 return R; 1576} 1577 1578/// ParseBitcodeFile - Read the specified bitcode file, returning the module. 1579/// If an error occurs, return null and fill in *ErrMsg if non-null. 1580Module *llvm::ParseBitcodeFile(MemoryBuffer *Buffer, std::string *ErrMsg){ 1581 BitcodeReader *R; 1582 R = static_cast<BitcodeReader*>(getBitcodeModuleProvider(Buffer, ErrMsg)); 1583 if (!R) return 0; 1584 1585 // Read the whole module, get a pointer to it, tell ModuleProvider not to 1586 // delete it when its dtor is run. 1587 Module *M = R->releaseModule(ErrMsg); 1588 1589 // Don't let the BitcodeReader dtor delete 'Buffer'. 1590 R->releaseMemoryBuffer(); 1591 delete R; 1592 return M; 1593} 1594