BitcodeReader.cpp revision 9113e73ecf72b0a94715b3e204211e2c7f55dda7
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 (Record.size() < Idx+1 || Record.size() < Record[Idx]+Idx+1) 40 return true; 41 42 for (unsigned i = 0, e = Record[Idx]; i != e; ++i) 43 Result += (char)Record[Idx+i+1]; 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()) 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()) 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, #pararms, paramty N] 317 if (Record.size() < 4 || Record.size() < Record[3]+4) 318 return Error("Invalid FUNCTION type record"); 319 std::vector<const Type*> ArgTys; 320 for (unsigned i = 0, e = Record[3]; i != e; ++i) 321 ArgTys.push_back(getTypeByID(Record[4+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, #elts, eltty x N] 328 if (Record.size() < 2 || Record.size() < Record[1]+2) 329 return Error("Invalid STRUCT type record"); 330 std::vector<const Type*> EltTys; 331 for (unsigned i = 0, e = Record[1]; i != e; ++i) 332 EltTys.push_back(getTypeByID(Record[2+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()) 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, namelen, 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()) 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, namelen, 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()) 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, n x intval] 595 if (!isa<IntegerType>(CurTy) || Record.empty() || 596 Record.size() < Record[0]+1) 597 return Error("Invalid WIDE_INTEGER record"); 598 599 unsigned NumWords = Record[0]; 600 SmallVector<uint64_t, 8> Words; 601 Words.resize(NumWords); 602 for (unsigned i = 0; i != NumWords; ++i) 603 Words[i] = DecodeSignRotatedValue(Record[i+1]); 604 V = ConstantInt::get(APInt(cast<IntegerType>(CurTy)->getBitWidth(), 605 NumWords, &Words[0])); 606 break; 607 } 608 case bitc::CST_CODE_FLOAT: // FLOAT: [fpval] 609 if (Record.empty()) 610 return Error("Invalid FLOAT record"); 611 if (CurTy == Type::FloatTy) 612 V = ConstantFP::get(CurTy, BitsToFloat(Record[0])); 613 else if (CurTy == Type::DoubleTy) 614 V = ConstantFP::get(CurTy, BitsToDouble(Record[0])); 615 else 616 V = UndefValue::get(CurTy); 617 break; 618 619 case bitc::CST_CODE_AGGREGATE: {// AGGREGATE: [n, n x value number] 620 if (Record.empty() || Record.size() < Record[0]+1) 621 return Error("Invalid CST_AGGREGATE record"); 622 623 unsigned Size = Record[0]; 624 std::vector<Constant*> Elts; 625 626 if (const StructType *STy = dyn_cast<StructType>(CurTy)) { 627 for (unsigned i = 0; i != Size; ++i) 628 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], 629 STy->getElementType(i))); 630 V = ConstantStruct::get(STy, Elts); 631 } else if (const ArrayType *ATy = dyn_cast<ArrayType>(CurTy)) { 632 const Type *EltTy = ATy->getElementType(); 633 for (unsigned i = 0; i != Size; ++i) 634 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], EltTy)); 635 V = ConstantArray::get(ATy, Elts); 636 } else if (const VectorType *VTy = dyn_cast<VectorType>(CurTy)) { 637 const Type *EltTy = VTy->getElementType(); 638 for (unsigned i = 0; i != Size; ++i) 639 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], EltTy)); 640 V = ConstantVector::get(Elts); 641 } else { 642 V = UndefValue::get(CurTy); 643 } 644 break; 645 } 646 647 case bitc::CST_CODE_CE_BINOP: { // CE_BINOP: [opcode, opval, opval] 648 if (Record.size() < 3) return Error("Invalid CE_BINOP record"); 649 int Opc = GetDecodedBinaryOpcode(Record[0], CurTy); 650 if (Opc < 0) { 651 V = UndefValue::get(CurTy); // Unknown binop. 652 } else { 653 Constant *LHS = ValueList.getConstantFwdRef(Record[1], CurTy); 654 Constant *RHS = ValueList.getConstantFwdRef(Record[2], CurTy); 655 V = ConstantExpr::get(Opc, LHS, RHS); 656 } 657 break; 658 } 659 case bitc::CST_CODE_CE_CAST: { // CE_CAST: [opcode, opty, opval] 660 if (Record.size() < 3) return Error("Invalid CE_CAST record"); 661 int Opc = GetDecodedCastOpcode(Record[0]); 662 if (Opc < 0) { 663 V = UndefValue::get(CurTy); // Unknown cast. 664 } else { 665 const Type *OpTy = getTypeByID(Record[1]); 666 Constant *Op = ValueList.getConstantFwdRef(Record[2], OpTy); 667 V = ConstantExpr::getCast(Opc, Op, CurTy); 668 } 669 break; 670 } 671 case bitc::CST_CODE_CE_GEP: { // CE_GEP: [n x operands] 672 if ((Record.size() & 1) == 0) return Error("Invalid CE_GEP record"); 673 SmallVector<Constant*, 16> Elts; 674 for (unsigned i = 1, e = Record.size(); i != e; i += 2) { 675 const Type *ElTy = getTypeByID(Record[i]); 676 if (!ElTy) return Error("Invalid CE_GEP record"); 677 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], ElTy)); 678 } 679 V = ConstantExpr::getGetElementPtr(Elts[0], &Elts[1], Elts.size()-1); 680 break; 681 } 682 case bitc::CST_CODE_CE_SELECT: // CE_SELECT: [opval#, opval#, opval#] 683 if (Record.size() < 3) return Error("Invalid CE_SELECT record"); 684 V = ConstantExpr::getSelect(ValueList.getConstantFwdRef(Record[0], 685 Type::Int1Ty), 686 ValueList.getConstantFwdRef(Record[1],CurTy), 687 ValueList.getConstantFwdRef(Record[2],CurTy)); 688 break; 689 case bitc::CST_CODE_CE_EXTRACTELT: { // CE_EXTRACTELT: [opty, opval, opval] 690 if (Record.size() < 3) return Error("Invalid CE_EXTRACTELT record"); 691 const VectorType *OpTy = 692 dyn_cast_or_null<VectorType>(getTypeByID(Record[0])); 693 if (OpTy == 0) return Error("Invalid CE_EXTRACTELT record"); 694 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 695 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], 696 OpTy->getElementType()); 697 V = ConstantExpr::getExtractElement(Op0, Op1); 698 break; 699 } 700 case bitc::CST_CODE_CE_INSERTELT: { // CE_INSERTELT: [opval, opval, opval] 701 const VectorType *OpTy = dyn_cast<VectorType>(CurTy); 702 if (Record.size() < 3 || OpTy == 0) 703 return Error("Invalid CE_INSERTELT record"); 704 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); 705 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], 706 OpTy->getElementType()); 707 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], Type::Int32Ty); 708 V = ConstantExpr::getInsertElement(Op0, Op1, Op2); 709 break; 710 } 711 case bitc::CST_CODE_CE_SHUFFLEVEC: { // CE_SHUFFLEVEC: [opval, opval, opval] 712 const VectorType *OpTy = dyn_cast<VectorType>(CurTy); 713 if (Record.size() < 3 || OpTy == 0) 714 return Error("Invalid CE_INSERTELT record"); 715 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); 716 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], OpTy); 717 const Type *ShufTy=VectorType::get(Type::Int32Ty, OpTy->getNumElements()); 718 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], ShufTy); 719 V = ConstantExpr::getShuffleVector(Op0, Op1, Op2); 720 break; 721 } 722 case bitc::CST_CODE_CE_CMP: { // CE_CMP: [opty, opval, opval, pred] 723 if (Record.size() < 4) return Error("Invalid CE_CMP record"); 724 const Type *OpTy = getTypeByID(Record[0]); 725 if (OpTy == 0) return Error("Invalid CE_CMP record"); 726 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 727 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy); 728 729 if (OpTy->isFloatingPoint()) 730 V = ConstantExpr::getFCmp(Record[3], Op0, Op1); 731 else 732 V = ConstantExpr::getICmp(Record[3], Op0, Op1); 733 break; 734 } 735 } 736 737 ValueList.AssignValue(V, NextCstNo); 738 ++NextCstNo; 739 } 740} 741 742/// RememberAndSkipFunctionBody - When we see the block for a function body, 743/// remember where it is and then skip it. This lets us lazily deserialize the 744/// functions. 745bool BitcodeReader::RememberAndSkipFunctionBody() { 746 // Get the function we are talking about. 747 if (FunctionsWithBodies.empty()) 748 return Error("Insufficient function protos"); 749 750 Function *Fn = FunctionsWithBodies.back(); 751 FunctionsWithBodies.pop_back(); 752 753 // Save the current stream state. 754 uint64_t CurBit = Stream.GetCurrentBitNo(); 755 DeferredFunctionInfo[Fn] = std::make_pair(CurBit, Fn->getLinkage()); 756 757 // Set the functions linkage to GhostLinkage so we know it is lazily 758 // deserialized. 759 Fn->setLinkage(GlobalValue::GhostLinkage); 760 761 // Skip over the function block for now. 762 if (Stream.SkipBlock()) 763 return Error("Malformed block record"); 764 return false; 765} 766 767bool BitcodeReader::ParseModule(const std::string &ModuleID) { 768 // Reject multiple MODULE_BLOCK's in a single bitstream. 769 if (TheModule) 770 return Error("Multiple MODULE_BLOCKs in same stream"); 771 772 if (Stream.EnterSubBlock()) 773 return Error("Malformed block record"); 774 775 // Otherwise, create the module. 776 TheModule = new Module(ModuleID); 777 778 SmallVector<uint64_t, 64> Record; 779 std::vector<std::string> SectionTable; 780 781 // Read all the records for this module. 782 while (!Stream.AtEndOfStream()) { 783 unsigned Code = Stream.ReadCode(); 784 if (Code == bitc::END_BLOCK) { 785 if (Stream.ReadBlockEnd()) 786 return Error("Error at end of module block"); 787 788 // Patch the initializers for globals and aliases up. 789 ResolveGlobalAndAliasInits(); 790 if (!GlobalInits.empty() || !AliasInits.empty()) 791 return Error("Malformed global initializer set"); 792 if (!FunctionsWithBodies.empty()) 793 return Error("Too few function bodies found"); 794 795 // Force deallocation of memory for these vectors to favor the client that 796 // want lazy deserialization. 797 std::vector<std::pair<GlobalVariable*, unsigned> >().swap(GlobalInits); 798 std::vector<std::pair<GlobalAlias*, unsigned> >().swap(AliasInits); 799 std::vector<Function*>().swap(FunctionsWithBodies); 800 return false; 801 } 802 803 if (Code == bitc::ENTER_SUBBLOCK) { 804 switch (Stream.ReadSubBlockID()) { 805 default: // Skip unknown content. 806 if (Stream.SkipBlock()) 807 return Error("Malformed block record"); 808 break; 809 case bitc::PARAMATTR_BLOCK_ID: 810 if (ParseParamAttrBlock()) 811 return true; 812 break; 813 case bitc::TYPE_BLOCK_ID: 814 if (ParseTypeTable()) 815 return true; 816 break; 817 case bitc::TYPE_SYMTAB_BLOCK_ID: 818 if (ParseTypeSymbolTable()) 819 return true; 820 break; 821 case bitc::VALUE_SYMTAB_BLOCK_ID: 822 if (ParseValueSymbolTable()) 823 return true; 824 break; 825 case bitc::CONSTANTS_BLOCK_ID: 826 if (ParseConstants() || ResolveGlobalAndAliasInits()) 827 return true; 828 break; 829 case bitc::FUNCTION_BLOCK_ID: 830 // If this is the first function body we've seen, reverse the 831 // FunctionsWithBodies list. 832 if (!HasReversedFunctionsWithBodies) { 833 std::reverse(FunctionsWithBodies.begin(), FunctionsWithBodies.end()); 834 HasReversedFunctionsWithBodies = true; 835 } 836 837 if (RememberAndSkipFunctionBody()) 838 return true; 839 break; 840 } 841 continue; 842 } 843 844 if (Code == bitc::DEFINE_ABBREV) { 845 Stream.ReadAbbrevRecord(); 846 continue; 847 } 848 849 // Read a record. 850 switch (Stream.ReadRecord(Code, Record)) { 851 default: break; // Default behavior, ignore unknown content. 852 case bitc::MODULE_CODE_VERSION: // VERSION: [version#] 853 if (Record.size() < 1) 854 return Error("Malformed MODULE_CODE_VERSION"); 855 // Only version #0 is supported so far. 856 if (Record[0] != 0) 857 return Error("Unknown bitstream version!"); 858 break; 859 case bitc::MODULE_CODE_TRIPLE: { // TRIPLE: [strlen, strchr x N] 860 std::string S; 861 if (ConvertToString(Record, 0, S)) 862 return Error("Invalid MODULE_CODE_TRIPLE record"); 863 TheModule->setTargetTriple(S); 864 break; 865 } 866 case bitc::MODULE_CODE_DATALAYOUT: { // DATALAYOUT: [strlen, strchr x N] 867 std::string S; 868 if (ConvertToString(Record, 0, S)) 869 return Error("Invalid MODULE_CODE_DATALAYOUT record"); 870 TheModule->setDataLayout(S); 871 break; 872 } 873 case bitc::MODULE_CODE_ASM: { // ASM: [strlen, strchr x N] 874 std::string S; 875 if (ConvertToString(Record, 0, S)) 876 return Error("Invalid MODULE_CODE_ASM record"); 877 TheModule->setModuleInlineAsm(S); 878 break; 879 } 880 case bitc::MODULE_CODE_DEPLIB: { // DEPLIB: [strlen, strchr x N] 881 std::string S; 882 if (ConvertToString(Record, 0, S)) 883 return Error("Invalid MODULE_CODE_DEPLIB record"); 884 TheModule->addLibrary(S); 885 break; 886 } 887 case bitc::MODULE_CODE_SECTIONNAME: { // SECTIONNAME: [strlen, strchr x N] 888 std::string S; 889 if (ConvertToString(Record, 0, S)) 890 return Error("Invalid MODULE_CODE_SECTIONNAME record"); 891 SectionTable.push_back(S); 892 break; 893 } 894 // GLOBALVAR: [type, isconst, initid, 895 // linkage, alignment, section, visibility, threadlocal] 896 case bitc::MODULE_CODE_GLOBALVAR: { 897 if (Record.size() < 6) 898 return Error("Invalid MODULE_CODE_GLOBALVAR record"); 899 const Type *Ty = getTypeByID(Record[0]); 900 if (!isa<PointerType>(Ty)) 901 return Error("Global not a pointer type!"); 902 Ty = cast<PointerType>(Ty)->getElementType(); 903 904 bool isConstant = Record[1]; 905 GlobalValue::LinkageTypes Linkage = GetDecodedLinkage(Record[3]); 906 unsigned Alignment = (1 << Record[4]) >> 1; 907 std::string Section; 908 if (Record[5]) { 909 if (Record[5]-1 >= SectionTable.size()) 910 return Error("Invalid section ID"); 911 Section = SectionTable[Record[5]-1]; 912 } 913 GlobalValue::VisibilityTypes Visibility = GlobalValue::DefaultVisibility; 914 if (Record.size() >= 6) Visibility = GetDecodedVisibility(Record[6]); 915 bool isThreadLocal = false; 916 if (Record.size() >= 7) isThreadLocal = Record[7]; 917 918 GlobalVariable *NewGV = 919 new GlobalVariable(Ty, isConstant, Linkage, 0, "", TheModule); 920 NewGV->setAlignment(Alignment); 921 if (!Section.empty()) 922 NewGV->setSection(Section); 923 NewGV->setVisibility(Visibility); 924 NewGV->setThreadLocal(isThreadLocal); 925 926 ValueList.push_back(NewGV); 927 928 // Remember which value to use for the global initializer. 929 if (unsigned InitID = Record[2]) 930 GlobalInits.push_back(std::make_pair(NewGV, InitID-1)); 931 break; 932 } 933 // FUNCTION: [type, callingconv, isproto, linkage, alignment, section, 934 // visibility] 935 case bitc::MODULE_CODE_FUNCTION: { 936 if (Record.size() < 7) 937 return Error("Invalid MODULE_CODE_FUNCTION record"); 938 const Type *Ty = getTypeByID(Record[0]); 939 if (!isa<PointerType>(Ty)) 940 return Error("Function not a pointer type!"); 941 const FunctionType *FTy = 942 dyn_cast<FunctionType>(cast<PointerType>(Ty)->getElementType()); 943 if (!FTy) 944 return Error("Function not a pointer to function type!"); 945 946 Function *Func = new Function(FTy, GlobalValue::ExternalLinkage, 947 "", TheModule); 948 949 Func->setCallingConv(Record[1]); 950 bool isProto = Record[2]; 951 Func->setLinkage(GetDecodedLinkage(Record[3])); 952 Func->setAlignment((1 << Record[4]) >> 1); 953 if (Record[5]) { 954 if (Record[5]-1 >= SectionTable.size()) 955 return Error("Invalid section ID"); 956 Func->setSection(SectionTable[Record[5]-1]); 957 } 958 Func->setVisibility(GetDecodedVisibility(Record[6])); 959 960 ValueList.push_back(Func); 961 962 // If this is a function with a body, remember the prototype we are 963 // creating now, so that we can match up the body with them later. 964 if (!isProto) 965 FunctionsWithBodies.push_back(Func); 966 break; 967 } 968 // ALIAS: [alias type, aliasee val#, linkage] 969 case bitc::MODULE_CODE_ALIAS: { 970 if (Record.size() < 3) 971 return Error("Invalid MODULE_ALIAS record"); 972 const Type *Ty = getTypeByID(Record[0]); 973 if (!isa<PointerType>(Ty)) 974 return Error("Function not a pointer type!"); 975 976 GlobalAlias *NewGA = new GlobalAlias(Ty, GetDecodedLinkage(Record[2]), 977 "", 0, TheModule); 978 ValueList.push_back(NewGA); 979 AliasInits.push_back(std::make_pair(NewGA, Record[1])); 980 break; 981 } 982 /// MODULE_CODE_PURGEVALS: [numvals] 983 case bitc::MODULE_CODE_PURGEVALS: 984 // Trim down the value list to the specified size. 985 if (Record.size() < 1 || Record[0] > ValueList.size()) 986 return Error("Invalid MODULE_PURGEVALS record"); 987 ValueList.shrinkTo(Record[0]); 988 break; 989 } 990 Record.clear(); 991 } 992 993 return Error("Premature end of bitstream"); 994} 995 996 997bool BitcodeReader::ParseBitcode() { 998 TheModule = 0; 999 1000 if (Buffer->getBufferSize() & 3) 1001 return Error("Bitcode stream should be a multiple of 4 bytes in length"); 1002 1003 unsigned char *BufPtr = (unsigned char *)Buffer->getBufferStart(); 1004 Stream.init(BufPtr, BufPtr+Buffer->getBufferSize()); 1005 1006 // Sniff for the signature. 1007 if (Stream.Read(8) != 'B' || 1008 Stream.Read(8) != 'C' || 1009 Stream.Read(4) != 0x0 || 1010 Stream.Read(4) != 0xC || 1011 Stream.Read(4) != 0xE || 1012 Stream.Read(4) != 0xD) 1013 return Error("Invalid bitcode signature"); 1014 1015 // We expect a number of well-defined blocks, though we don't necessarily 1016 // need to understand them all. 1017 while (!Stream.AtEndOfStream()) { 1018 unsigned Code = Stream.ReadCode(); 1019 1020 if (Code != bitc::ENTER_SUBBLOCK) 1021 return Error("Invalid record at top-level"); 1022 1023 unsigned BlockID = Stream.ReadSubBlockID(); 1024 1025 // We only know the MODULE subblock ID. 1026 if (BlockID == bitc::MODULE_BLOCK_ID) { 1027 if (ParseModule(Buffer->getBufferIdentifier())) 1028 return true; 1029 } else if (Stream.SkipBlock()) { 1030 return Error("Malformed block record"); 1031 } 1032 } 1033 1034 return false; 1035} 1036 1037 1038bool BitcodeReader::materializeFunction(Function *F, std::string *ErrInfo) { 1039 // If it already is material, ignore the request. 1040 if (!F->hasNotBeenReadFromBytecode()) return false; 1041 1042 DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator DFII = 1043 DeferredFunctionInfo.find(F); 1044 assert(DFII != DeferredFunctionInfo.end() && "Deferred function not found!"); 1045 1046 // Move the bit stream to the saved position of the deferred function body and 1047 // restore the real linkage type for the function. 1048 Stream.JumpToBit(DFII->second.first); 1049 F->setLinkage((GlobalValue::LinkageTypes)DFII->second.second); 1050 DeferredFunctionInfo.erase(DFII); 1051 1052 if (ParseFunctionBody(F)) { 1053 if (ErrInfo) *ErrInfo = ErrorString; 1054 return true; 1055 } 1056 1057 return false; 1058} 1059 1060Module *BitcodeReader::materializeModule(std::string *ErrInfo) { 1061 DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator I = 1062 DeferredFunctionInfo.begin(); 1063 while (!DeferredFunctionInfo.empty()) { 1064 Function *F = (*I++).first; 1065 assert(F->hasNotBeenReadFromBytecode() && 1066 "Deserialized function found in map!"); 1067 if (materializeFunction(F, ErrInfo)) 1068 return 0; 1069 } 1070 return TheModule; 1071} 1072 1073 1074/// ParseFunctionBody - Lazily parse the specified function body block. 1075bool BitcodeReader::ParseFunctionBody(Function *F) { 1076 if (Stream.EnterSubBlock()) 1077 return Error("Malformed block record"); 1078 1079 unsigned ModuleValueListSize = ValueList.size(); 1080 1081 // Add all the function arguments to the value table. 1082 for(Function::arg_iterator I = F->arg_begin(), E = F->arg_end(); I != E; ++I) 1083 ValueList.push_back(I); 1084 1085 unsigned NextValueNo = ValueList.size(); 1086 BasicBlock *CurBB = 0; 1087 unsigned CurBBNo = 0; 1088 1089 // Read all the records. 1090 SmallVector<uint64_t, 64> Record; 1091 while (1) { 1092 unsigned Code = Stream.ReadCode(); 1093 if (Code == bitc::END_BLOCK) { 1094 if (Stream.ReadBlockEnd()) 1095 return Error("Error at end of function block"); 1096 break; 1097 } 1098 1099 if (Code == bitc::ENTER_SUBBLOCK) { 1100 switch (Stream.ReadSubBlockID()) { 1101 default: // Skip unknown content. 1102 if (Stream.SkipBlock()) 1103 return Error("Malformed block record"); 1104 break; 1105 case bitc::CONSTANTS_BLOCK_ID: 1106 if (ParseConstants()) return true; 1107 NextValueNo = ValueList.size(); 1108 break; 1109 case bitc::VALUE_SYMTAB_BLOCK_ID: 1110 if (ParseValueSymbolTable()) return true; 1111 break; 1112 } 1113 continue; 1114 } 1115 1116 if (Code == bitc::DEFINE_ABBREV) { 1117 Stream.ReadAbbrevRecord(); 1118 continue; 1119 } 1120 1121 // Read a record. 1122 Record.clear(); 1123 Instruction *I = 0; 1124 switch (Stream.ReadRecord(Code, Record)) { 1125 default: // Default behavior: reject 1126 return Error("Unknown instruction"); 1127 case bitc::FUNC_CODE_DECLAREBLOCKS: // DECLAREBLOCKS: [nblocks] 1128 if (Record.size() < 1 || Record[0] == 0) 1129 return Error("Invalid DECLAREBLOCKS record"); 1130 // Create all the basic blocks for the function. 1131 FunctionBBs.resize(Record[0]); 1132 for (unsigned i = 0, e = FunctionBBs.size(); i != e; ++i) 1133 FunctionBBs[i] = new BasicBlock("", F); 1134 CurBB = FunctionBBs[0]; 1135 continue; 1136 1137 case bitc::FUNC_CODE_INST_BINOP: { // BINOP: [opcode, ty, opval, opval] 1138 if (Record.size() < 4) return Error("Invalid BINOP record"); 1139 const Type *Ty = getTypeByID(Record[1]); 1140 int Opc = GetDecodedBinaryOpcode(Record[0], Ty); 1141 Value *LHS = getFnValueByID(Record[2], Ty); 1142 Value *RHS = getFnValueByID(Record[3], Ty); 1143 if (Opc == -1 || Ty == 0 || LHS == 0 || RHS == 0) 1144 return Error("Invalid BINOP record"); 1145 I = BinaryOperator::create((Instruction::BinaryOps)Opc, LHS, RHS); 1146 break; 1147 } 1148 case bitc::FUNC_CODE_INST_CAST: { // CAST: [opcode, ty, opty, opval] 1149 if (Record.size() < 4) return Error("Invalid CAST record"); 1150 int Opc = GetDecodedCastOpcode(Record[0]); 1151 const Type *ResTy = getTypeByID(Record[1]); 1152 const Type *OpTy = getTypeByID(Record[2]); 1153 Value *Op = getFnValueByID(Record[3], OpTy); 1154 if (Opc == -1 || ResTy == 0 || OpTy == 0 || Op == 0) 1155 return Error("Invalid CAST record"); 1156 I = CastInst::create((Instruction::CastOps)Opc, Op, ResTy); 1157 break; 1158 } 1159 case bitc::FUNC_CODE_INST_GEP: { // GEP: [n, n x operands] 1160 if (Record.size() < 2 || (Record.size() & 1)) 1161 return Error("Invalid GEP record"); 1162 const Type *OpTy = getTypeByID(Record[0]); 1163 Value *Op = getFnValueByID(Record[1], OpTy); 1164 if (OpTy == 0 || Op == 0) 1165 return Error("Invalid GEP record"); 1166 1167 SmallVector<Value*, 16> GEPIdx; 1168 for (unsigned i = 1, e = Record.size()/2; i != e; ++i) { 1169 const Type *IdxTy = getTypeByID(Record[i*2]); 1170 Value *Idx = getFnValueByID(Record[i*2+1], IdxTy); 1171 if (IdxTy == 0 || Idx == 0) 1172 return Error("Invalid GEP record"); 1173 GEPIdx.push_back(Idx); 1174 } 1175 1176 I = new GetElementPtrInst(Op, &GEPIdx[0], GEPIdx.size()); 1177 break; 1178 } 1179 1180 case bitc::FUNC_CODE_INST_SELECT: { // SELECT: [ty, opval, opval, opval] 1181 if (Record.size() < 4) return Error("Invalid SELECT record"); 1182 const Type *Ty = getTypeByID(Record[0]); 1183 Value *Cond = getFnValueByID(Record[1], Type::Int1Ty); 1184 Value *LHS = getFnValueByID(Record[2], Ty); 1185 Value *RHS = getFnValueByID(Record[3], Ty); 1186 if (Ty == 0 || Cond == 0 || LHS == 0 || RHS == 0) 1187 return Error("Invalid SELECT record"); 1188 I = new SelectInst(Cond, LHS, RHS); 1189 break; 1190 } 1191 1192 case bitc::FUNC_CODE_INST_EXTRACTELT: { // EXTRACTELT: [opty, opval, opval] 1193 if (Record.size() < 3) return Error("Invalid EXTRACTELT record"); 1194 const Type *OpTy = getTypeByID(Record[0]); 1195 Value *Vec = getFnValueByID(Record[1], OpTy); 1196 Value *Idx = getFnValueByID(Record[2], Type::Int32Ty); 1197 if (OpTy == 0 || Vec == 0 || Idx == 0) 1198 return Error("Invalid EXTRACTELT record"); 1199 I = new ExtractElementInst(Vec, Idx); 1200 break; 1201 } 1202 1203 case bitc::FUNC_CODE_INST_INSERTELT: { // INSERTELT: [ty, opval,opval,opval] 1204 if (Record.size() < 4) return Error("Invalid INSERTELT record"); 1205 const VectorType *OpTy = 1206 dyn_cast_or_null<VectorType>(getTypeByID(Record[0])); 1207 if (OpTy == 0) return Error("Invalid INSERTELT record"); 1208 Value *Vec = getFnValueByID(Record[1], OpTy); 1209 Value *Elt = getFnValueByID(Record[2], OpTy->getElementType()); 1210 Value *Idx = getFnValueByID(Record[3], Type::Int32Ty); 1211 if (Vec == 0 || Elt == 0 || Idx == 0) 1212 return Error("Invalid INSERTELT record"); 1213 I = new InsertElementInst(Vec, Elt, Idx); 1214 break; 1215 } 1216 1217 case bitc::FUNC_CODE_INST_SHUFFLEVEC: {// SHUFFLEVEC: [ty,opval,opval,opval] 1218 if (Record.size() < 4) return Error("Invalid SHUFFLEVEC record"); 1219 const VectorType *OpTy = 1220 dyn_cast_or_null<VectorType>(getTypeByID(Record[0])); 1221 if (OpTy == 0) return Error("Invalid SHUFFLEVEC record"); 1222 Value *Vec1 = getFnValueByID(Record[1], OpTy); 1223 Value *Vec2 = getFnValueByID(Record[2], OpTy); 1224 Value *Mask = getFnValueByID(Record[3], 1225 VectorType::get(Type::Int32Ty, 1226 OpTy->getNumElements())); 1227 if (Vec1 == 0 || Vec2 == 0 || Mask == 0) 1228 return Error("Invalid SHUFFLEVEC record"); 1229 I = new ShuffleVectorInst(Vec1, Vec2, Mask); 1230 break; 1231 } 1232 1233 case bitc::FUNC_CODE_INST_CMP: { // CMP: [opty, opval, opval, pred] 1234 if (Record.size() < 4) return Error("Invalid CMP record"); 1235 const Type *OpTy = getTypeByID(Record[0]); 1236 Value *LHS = getFnValueByID(Record[1], OpTy); 1237 Value *RHS = getFnValueByID(Record[2], OpTy); 1238 if (OpTy == 0 || LHS == 0 || RHS == 0) 1239 return Error("Invalid CMP record"); 1240 if (OpTy->isFPOrFPVector()) 1241 I = new FCmpInst((FCmpInst::Predicate)Record[3], LHS, RHS); 1242 else 1243 I = new ICmpInst((ICmpInst::Predicate)Record[3], LHS, RHS); 1244 break; 1245 } 1246 1247 case bitc::FUNC_CODE_INST_RET: // RET: [opty,opval<optional>] 1248 if (Record.size() == 0) { 1249 I = new ReturnInst(); 1250 break; 1251 } 1252 if (Record.size() == 2) { 1253 const Type *OpTy = getTypeByID(Record[0]); 1254 Value *Op = getFnValueByID(Record[1], OpTy); 1255 if (!OpTy || !Op) 1256 return Error("Invalid RET record"); 1257 I = new ReturnInst(Op); 1258 break; 1259 } 1260 return Error("Invalid RET record"); 1261 case bitc::FUNC_CODE_INST_BR: { // BR: [bb#, bb#, opval] or [bb#] 1262 if (Record.size() != 1 && Record.size() != 3) 1263 return Error("Invalid BR record"); 1264 BasicBlock *TrueDest = getBasicBlock(Record[0]); 1265 if (TrueDest == 0) 1266 return Error("Invalid BR record"); 1267 1268 if (Record.size() == 1) 1269 I = new BranchInst(TrueDest); 1270 else { 1271 BasicBlock *FalseDest = getBasicBlock(Record[1]); 1272 Value *Cond = getFnValueByID(Record[2], Type::Int1Ty); 1273 if (FalseDest == 0 || Cond == 0) 1274 return Error("Invalid BR record"); 1275 I = new BranchInst(TrueDest, FalseDest, Cond); 1276 } 1277 break; 1278 } 1279 case bitc::FUNC_CODE_INST_SWITCH: { // SWITCH: [opty, opval, n, n x ops] 1280 if (Record.size() < 3 || (Record.size() & 1) == 0) 1281 return Error("Invalid SWITCH record"); 1282 const Type *OpTy = getTypeByID(Record[0]); 1283 Value *Cond = getFnValueByID(Record[1], OpTy); 1284 BasicBlock *Default = getBasicBlock(Record[2]); 1285 if (OpTy == 0 || Cond == 0 || Default == 0) 1286 return Error("Invalid SWITCH record"); 1287 unsigned NumCases = (Record.size()-3)/2; 1288 SwitchInst *SI = new SwitchInst(Cond, Default, NumCases); 1289 for (unsigned i = 0, e = NumCases; i != e; ++i) { 1290 ConstantInt *CaseVal = 1291 dyn_cast_or_null<ConstantInt>(getFnValueByID(Record[3+i*2], OpTy)); 1292 BasicBlock *DestBB = getBasicBlock(Record[1+3+i*2]); 1293 if (CaseVal == 0 || DestBB == 0) { 1294 delete SI; 1295 return Error("Invalid SWITCH record!"); 1296 } 1297 SI->addCase(CaseVal, DestBB); 1298 } 1299 I = SI; 1300 break; 1301 } 1302 1303 case bitc::FUNC_CODE_INST_INVOKE: { // INVOKE: [cc,fnty, op0,op1,op2, ...] 1304 if (Record.size() < 5) 1305 return Error("Invalid INVOKE record"); 1306 unsigned CCInfo = Record[0]; 1307 const PointerType *CalleeTy = 1308 dyn_cast_or_null<PointerType>(getTypeByID(Record[1])); 1309 Value *Callee = getFnValueByID(Record[2], CalleeTy); 1310 BasicBlock *NormalBB = getBasicBlock(Record[3]); 1311 BasicBlock *UnwindBB = getBasicBlock(Record[4]); 1312 if (CalleeTy == 0 || Callee == 0 || NormalBB == 0 || UnwindBB == 0) 1313 return Error("Invalid INVOKE record"); 1314 1315 const FunctionType *FTy = 1316 dyn_cast<FunctionType>(CalleeTy->getElementType()); 1317 1318 // Check that the right number of fixed parameters are here. 1319 if (FTy == 0 || Record.size() < 5+FTy->getNumParams()) 1320 return Error("Invalid INVOKE record"); 1321 1322 SmallVector<Value*, 16> Ops; 1323 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) { 1324 Ops.push_back(getFnValueByID(Record[5+i], FTy->getParamType(i))); 1325 if (Ops.back() == 0) 1326 return Error("Invalid INVOKE record"); 1327 } 1328 1329 unsigned FirstVarargParam = 5+FTy->getNumParams(); 1330 if (FTy->isVarArg()) { 1331 // Read type/value pairs for varargs params. 1332 if ((Record.size()-FirstVarargParam) & 1) 1333 return Error("Invalid INVOKE record"); 1334 1335 for (unsigned i = FirstVarargParam, e = Record.size(); i != e; i += 2) { 1336 const Type *ArgTy = getTypeByID(Record[i]); 1337 Ops.push_back(getFnValueByID(Record[i+1], ArgTy)); 1338 if (Ops.back() == 0 || ArgTy == 0) 1339 return Error("Invalid INVOKE record"); 1340 } 1341 } else { 1342 if (Record.size() != FirstVarargParam) 1343 return Error("Invalid INVOKE record"); 1344 } 1345 1346 I = new InvokeInst(Callee, NormalBB, UnwindBB, &Ops[0], Ops.size()); 1347 cast<InvokeInst>(I)->setCallingConv(CCInfo); 1348 break; 1349 } 1350 case bitc::FUNC_CODE_INST_UNWIND: // UNWIND 1351 I = new UnwindInst(); 1352 break; 1353 case bitc::FUNC_CODE_INST_UNREACHABLE: // UNREACHABLE 1354 I = new UnreachableInst(); 1355 break; 1356 case bitc::FUNC_CODE_INST_PHI: { // PHI: [ty, #ops, val0,bb0, ...] 1357 if (Record.size() < 2 || Record.size() < 2+Record[1] || (Record[1]&1)) 1358 return Error("Invalid PHI record"); 1359 const Type *Ty = getTypeByID(Record[0]); 1360 if (!Ty) return Error("Invalid PHI record"); 1361 1362 PHINode *PN = new PHINode(Ty); 1363 PN->reserveOperandSpace(Record[1]); 1364 1365 for (unsigned i = 0, e = Record[1]; i != e; i += 2) { 1366 Value *V = getFnValueByID(Record[2+i], Ty); 1367 BasicBlock *BB = getBasicBlock(Record[3+i]); 1368 if (!V || !BB) return Error("Invalid PHI record"); 1369 PN->addIncoming(V, BB); 1370 } 1371 I = PN; 1372 break; 1373 } 1374 1375 case bitc::FUNC_CODE_INST_MALLOC: { // MALLOC: [instty, op, align] 1376 if (Record.size() < 3) 1377 return Error("Invalid MALLOC record"); 1378 const PointerType *Ty = 1379 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1380 Value *Size = getFnValueByID(Record[1], Type::Int32Ty); 1381 unsigned Align = Record[2]; 1382 if (!Ty || !Size) return Error("Invalid MALLOC record"); 1383 I = new MallocInst(Ty->getElementType(), Size, (1 << Align) >> 1); 1384 break; 1385 } 1386 case bitc::FUNC_CODE_INST_FREE: { // FREE: [opty, op] 1387 if (Record.size() < 2) 1388 return Error("Invalid FREE record"); 1389 const Type *OpTy = getTypeByID(Record[0]); 1390 Value *Op = getFnValueByID(Record[1], OpTy); 1391 if (!OpTy || !Op) 1392 return Error("Invalid FREE record"); 1393 I = new FreeInst(Op); 1394 break; 1395 } 1396 case bitc::FUNC_CODE_INST_ALLOCA: { // ALLOCA: [instty, op, align] 1397 if (Record.size() < 3) 1398 return Error("Invalid ALLOCA record"); 1399 const PointerType *Ty = 1400 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1401 Value *Size = getFnValueByID(Record[1], Type::Int32Ty); 1402 unsigned Align = Record[2]; 1403 if (!Ty || !Size) return Error("Invalid ALLOCA record"); 1404 I = new AllocaInst(Ty->getElementType(), Size, (1 << Align) >> 1); 1405 break; 1406 } 1407 case bitc::FUNC_CODE_INST_LOAD: { // LOAD: [opty, op, align, vol] 1408 if (Record.size() < 4) 1409 return Error("Invalid LOAD record"); 1410 const Type *OpTy = getTypeByID(Record[0]); 1411 Value *Op = getFnValueByID(Record[1], OpTy); 1412 if (!OpTy || !Op) 1413 return Error("Invalid LOAD record"); 1414 I = new LoadInst(Op, "", Record[3], (1 << Record[2]) >> 1); 1415 break; 1416 } 1417 case bitc::FUNC_CODE_INST_STORE: { // STORE:[ptrty,val,ptr, align, vol] 1418 if (Record.size() < 5) 1419 return Error("Invalid LOAD record"); 1420 const PointerType *OpTy = 1421 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1422 Value *Op = getFnValueByID(Record[1], OpTy ? OpTy->getElementType() : 0); 1423 Value *Ptr = getFnValueByID(Record[2], OpTy); 1424 if (!OpTy || !Op || !Ptr) 1425 return Error("Invalid STORE record"); 1426 I = new StoreInst(Op, Ptr, (1 << Record[3]) >> 1, Record[4]); 1427 break; 1428 } 1429 case bitc::FUNC_CODE_INST_CALL: { // CALL: [cc, fnty, fnid, arg0, arg1...] 1430 if (Record.size() < 3) 1431 return Error("Invalid CALL record"); 1432 unsigned CCInfo = Record[0]; 1433 const PointerType *OpTy = 1434 dyn_cast_or_null<PointerType>(getTypeByID(Record[1])); 1435 const FunctionType *FTy = 0; 1436 if (OpTy) FTy = dyn_cast<FunctionType>(OpTy->getElementType()); 1437 Value *Callee = getFnValueByID(Record[2], OpTy); 1438 if (!FTy || !Callee || Record.size() < FTy->getNumParams()+3) 1439 return Error("Invalid CALL record"); 1440 1441 SmallVector<Value*, 16> Args; 1442 // Read the fixed params. 1443 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) { 1444 Args.push_back(getFnValueByID(Record[i+3], FTy->getParamType(i))); 1445 if (Args.back() == 0) return Error("Invalid CALL record"); 1446 } 1447 1448 1449 // Read type/value pairs for varargs params. 1450 unsigned NextArg = FTy->getNumParams()+3; 1451 if (!FTy->isVarArg()) { 1452 if (NextArg != Record.size()) 1453 return Error("Invalid CALL record"); 1454 } else { 1455 if ((Record.size()-NextArg) & 1) 1456 return Error("Invalid CALL record"); 1457 for (unsigned e = Record.size(); NextArg != e; NextArg += 2) { 1458 Args.push_back(getFnValueByID(Record[NextArg+1], 1459 getTypeByID(Record[NextArg]))); 1460 if (Args.back() == 0) return Error("Invalid CALL record"); 1461 } 1462 } 1463 1464 I = new CallInst(Callee, &Args[0], Args.size()); 1465 cast<CallInst>(I)->setCallingConv(CCInfo>>1); 1466 cast<CallInst>(I)->setTailCall(CCInfo & 1); 1467 break; 1468 } 1469 case bitc::FUNC_CODE_INST_VAARG: { // VAARG: [valistty, valist, instty] 1470 if (Record.size() < 3) 1471 return Error("Invalid VAARG record"); 1472 const Type *OpTy = getTypeByID(Record[0]); 1473 Value *Op = getFnValueByID(Record[1], OpTy); 1474 const Type *ResTy = getTypeByID(Record[2]); 1475 if (!OpTy || !Op || !ResTy) 1476 return Error("Invalid VAARG record"); 1477 I = new VAArgInst(Op, ResTy); 1478 break; 1479 } 1480 } 1481 1482 // Add instruction to end of current BB. If there is no current BB, reject 1483 // this file. 1484 if (CurBB == 0) { 1485 delete I; 1486 return Error("Invalid instruction with no BB"); 1487 } 1488 CurBB->getInstList().push_back(I); 1489 1490 // If this was a terminator instruction, move to the next block. 1491 if (isa<TerminatorInst>(I)) { 1492 ++CurBBNo; 1493 CurBB = CurBBNo < FunctionBBs.size() ? FunctionBBs[CurBBNo] : 0; 1494 } 1495 1496 // Non-void values get registered in the value table for future use. 1497 if (I && I->getType() != Type::VoidTy) 1498 ValueList.AssignValue(I, NextValueNo++); 1499 } 1500 1501 // Check the function list for unresolved values. 1502 if (Argument *A = dyn_cast<Argument>(ValueList.back())) { 1503 if (A->getParent() == 0) { 1504 // We found at least one unresolved value. Nuke them all to avoid leaks. 1505 for (unsigned i = ModuleValueListSize, e = ValueList.size(); i != e; ++i){ 1506 if ((A = dyn_cast<Argument>(ValueList.back())) && A->getParent() == 0) { 1507 A->replaceAllUsesWith(UndefValue::get(A->getType())); 1508 delete A; 1509 } 1510 } 1511 } 1512 return Error("Never resolved value found in function!"); 1513 } 1514 1515 // Trim the value list down to the size it was before we parsed this function. 1516 ValueList.shrinkTo(ModuleValueListSize); 1517 std::vector<BasicBlock*>().swap(FunctionBBs); 1518 1519 return false; 1520} 1521 1522 1523//===----------------------------------------------------------------------===// 1524// External interface 1525//===----------------------------------------------------------------------===// 1526 1527/// getBitcodeModuleProvider - lazy function-at-a-time loading from a file. 1528/// 1529ModuleProvider *llvm::getBitcodeModuleProvider(MemoryBuffer *Buffer, 1530 std::string *ErrMsg) { 1531 BitcodeReader *R = new BitcodeReader(Buffer); 1532 if (R->ParseBitcode()) { 1533 if (ErrMsg) 1534 *ErrMsg = R->getErrorString(); 1535 1536 // Don't let the BitcodeReader dtor delete 'Buffer'. 1537 R->releaseMemoryBuffer(); 1538 delete R; 1539 return 0; 1540 } 1541 return R; 1542} 1543 1544/// ParseBitcodeFile - Read the specified bitcode file, returning the module. 1545/// If an error occurs, return null and fill in *ErrMsg if non-null. 1546Module *llvm::ParseBitcodeFile(MemoryBuffer *Buffer, std::string *ErrMsg){ 1547 BitcodeReader *R; 1548 R = static_cast<BitcodeReader*>(getBitcodeModuleProvider(Buffer, ErrMsg)); 1549 if (!R) return 0; 1550 1551 // Read the whole module, get a pointer to it, tell ModuleProvider not to 1552 // delete it when its dtor is run. 1553 Module *M = R->releaseModule(ErrMsg); 1554 1555 // Don't let the BitcodeReader dtor delete 'Buffer'. 1556 R->releaseMemoryBuffer(); 1557 delete R; 1558 return M; 1559} 1560