BitcodeReader.cpp revision d67c632d968157e228cf42b588f8759059730ec0
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/InlineAsm.h" 19#include "llvm/Instructions.h" 20#include "llvm/Module.h" 21#include "llvm/ParameterAttributes.h" 22#include "llvm/ADT/SmallString.h" 23#include "llvm/Support/MathExtras.h" 24#include "llvm/Support/MemoryBuffer.h" 25using namespace llvm; 26 27BitcodeReader::~BitcodeReader() { 28 delete Buffer; 29} 30 31//===----------------------------------------------------------------------===// 32// Helper functions to implement forward reference resolution, etc. 33//===----------------------------------------------------------------------===// 34 35/// ConvertToString - Convert a string from a record into an std::string, return 36/// true on failure. 37template<typename StrTy> 38static bool ConvertToString(SmallVector<uint64_t, 64> &Record, unsigned Idx, 39 StrTy &Result) { 40 if (Idx > Record.size()) 41 return true; 42 43 for (unsigned i = Idx, e = Record.size(); i != e; ++i) 44 Result += (char)Record[i]; 45 return false; 46} 47 48static GlobalValue::LinkageTypes GetDecodedLinkage(unsigned Val) { 49 switch (Val) { 50 default: // Map unknown/new linkages to external 51 case 0: return GlobalValue::ExternalLinkage; 52 case 1: return GlobalValue::WeakLinkage; 53 case 2: return GlobalValue::AppendingLinkage; 54 case 3: return GlobalValue::InternalLinkage; 55 case 4: return GlobalValue::LinkOnceLinkage; 56 case 5: return GlobalValue::DLLImportLinkage; 57 case 6: return GlobalValue::DLLExportLinkage; 58 case 7: return GlobalValue::ExternalWeakLinkage; 59 } 60} 61 62static GlobalValue::VisibilityTypes GetDecodedVisibility(unsigned Val) { 63 switch (Val) { 64 default: // Map unknown visibilities to default. 65 case 0: return GlobalValue::DefaultVisibility; 66 case 1: return GlobalValue::HiddenVisibility; 67 case 2: return GlobalValue::ProtectedVisibility; 68 } 69} 70 71static int GetDecodedCastOpcode(unsigned Val) { 72 switch (Val) { 73 default: return -1; 74 case bitc::CAST_TRUNC : return Instruction::Trunc; 75 case bitc::CAST_ZEXT : return Instruction::ZExt; 76 case bitc::CAST_SEXT : return Instruction::SExt; 77 case bitc::CAST_FPTOUI : return Instruction::FPToUI; 78 case bitc::CAST_FPTOSI : return Instruction::FPToSI; 79 case bitc::CAST_UITOFP : return Instruction::UIToFP; 80 case bitc::CAST_SITOFP : return Instruction::SIToFP; 81 case bitc::CAST_FPTRUNC : return Instruction::FPTrunc; 82 case bitc::CAST_FPEXT : return Instruction::FPExt; 83 case bitc::CAST_PTRTOINT: return Instruction::PtrToInt; 84 case bitc::CAST_INTTOPTR: return Instruction::IntToPtr; 85 case bitc::CAST_BITCAST : return Instruction::BitCast; 86 } 87} 88static int GetDecodedBinaryOpcode(unsigned Val, const Type *Ty) { 89 switch (Val) { 90 default: return -1; 91 case bitc::BINOP_ADD: return Instruction::Add; 92 case bitc::BINOP_SUB: return Instruction::Sub; 93 case bitc::BINOP_MUL: return Instruction::Mul; 94 case bitc::BINOP_UDIV: return Instruction::UDiv; 95 case bitc::BINOP_SDIV: 96 return Ty->isFPOrFPVector() ? Instruction::FDiv : Instruction::SDiv; 97 case bitc::BINOP_UREM: return Instruction::URem; 98 case bitc::BINOP_SREM: 99 return Ty->isFPOrFPVector() ? Instruction::FRem : Instruction::SRem; 100 case bitc::BINOP_SHL: return Instruction::Shl; 101 case bitc::BINOP_LSHR: return Instruction::LShr; 102 case bitc::BINOP_ASHR: return Instruction::AShr; 103 case bitc::BINOP_AND: return Instruction::And; 104 case bitc::BINOP_OR: return Instruction::Or; 105 case bitc::BINOP_XOR: return Instruction::Xor; 106 } 107} 108 109 110namespace { 111 /// @brief A class for maintaining the slot number definition 112 /// as a placeholder for the actual definition for forward constants defs. 113 class ConstantPlaceHolder : public ConstantExpr { 114 ConstantPlaceHolder(); // DO NOT IMPLEMENT 115 void operator=(const ConstantPlaceHolder &); // DO NOT IMPLEMENT 116 public: 117 Use Op; 118 ConstantPlaceHolder(const Type *Ty) 119 : ConstantExpr(Ty, Instruction::UserOp1, &Op, 1), 120 Op(UndefValue::get(Type::Int32Ty), this) { 121 } 122 }; 123} 124 125Constant *BitcodeReaderValueList::getConstantFwdRef(unsigned Idx, 126 const Type *Ty) { 127 if (Idx >= size()) { 128 // Insert a bunch of null values. 129 Uses.resize(Idx+1); 130 OperandList = &Uses[0]; 131 NumOperands = Idx+1; 132 } 133 134 if (Value *V = Uses[Idx]) { 135 assert(Ty == V->getType() && "Type mismatch in constant table!"); 136 return cast<Constant>(V); 137 } 138 139 // Create and return a placeholder, which will later be RAUW'd. 140 Constant *C = new ConstantPlaceHolder(Ty); 141 Uses[Idx].init(C, this); 142 return C; 143} 144 145Value *BitcodeReaderValueList::getValueFwdRef(unsigned Idx, const Type *Ty) { 146 if (Idx >= size()) { 147 // Insert a bunch of null values. 148 Uses.resize(Idx+1); 149 OperandList = &Uses[0]; 150 NumOperands = Idx+1; 151 } 152 153 if (Value *V = Uses[Idx]) { 154 assert((Ty == 0 || Ty == V->getType()) && "Type mismatch in value table!"); 155 return V; 156 } 157 158 // No type specified, must be invalid reference. 159 if (Ty == 0) return 0; 160 161 // Create and return a placeholder, which will later be RAUW'd. 162 Value *V = new Argument(Ty); 163 Uses[Idx].init(V, this); 164 return V; 165} 166 167 168const Type *BitcodeReader::getTypeByID(unsigned ID, bool isTypeTable) { 169 // If the TypeID is in range, return it. 170 if (ID < TypeList.size()) 171 return TypeList[ID].get(); 172 if (!isTypeTable) return 0; 173 174 // The type table allows forward references. Push as many Opaque types as 175 // needed to get up to ID. 176 while (TypeList.size() <= ID) 177 TypeList.push_back(OpaqueType::get()); 178 return TypeList.back().get(); 179} 180 181//===----------------------------------------------------------------------===// 182// Functions for parsing blocks from the bitcode file 183//===----------------------------------------------------------------------===// 184 185bool BitcodeReader::ParseParamAttrBlock() { 186 if (Stream.EnterSubBlock(bitc::PARAMATTR_BLOCK_ID)) 187 return Error("Malformed block record"); 188 189 if (!ParamAttrs.empty()) 190 return Error("Multiple PARAMATTR blocks found!"); 191 192 SmallVector<uint64_t, 64> Record; 193 194 ParamAttrsVector Attrs; 195 196 // Read all the records. 197 while (1) { 198 unsigned Code = Stream.ReadCode(); 199 if (Code == bitc::END_BLOCK) { 200 if (Stream.ReadBlockEnd()) 201 return Error("Error at end of PARAMATTR block"); 202 return false; 203 } 204 205 if (Code == bitc::ENTER_SUBBLOCK) { 206 // No known subblocks, always skip them. 207 Stream.ReadSubBlockID(); 208 if (Stream.SkipBlock()) 209 return Error("Malformed block record"); 210 continue; 211 } 212 213 if (Code == bitc::DEFINE_ABBREV) { 214 Stream.ReadAbbrevRecord(); 215 continue; 216 } 217 218 // Read a record. 219 Record.clear(); 220 switch (Stream.ReadRecord(Code, Record)) { 221 default: // Default behavior: ignore. 222 break; 223 case bitc::PARAMATTR_CODE_ENTRY: { // ENTRY: [paramidx0, attr0, ...] 224 if (Record.size() & 1) 225 return Error("Invalid ENTRY record"); 226 227 ParamAttrsWithIndex PAWI; 228 for (unsigned i = 0, e = Record.size(); i != e; i += 2) { 229 PAWI.index = Record[i]; 230 PAWI.attrs = Record[i+1]; 231 Attrs.push_back(PAWI); 232 } 233 ParamAttrs.push_back(ParamAttrsList::get(Attrs)); 234 Attrs.clear(); 235 break; 236 } 237 } 238 } 239} 240 241 242bool BitcodeReader::ParseTypeTable() { 243 if (Stream.EnterSubBlock(bitc::TYPE_BLOCK_ID)) 244 return Error("Malformed block record"); 245 246 if (!TypeList.empty()) 247 return Error("Multiple TYPE_BLOCKs found!"); 248 249 SmallVector<uint64_t, 64> Record; 250 unsigned NumRecords = 0; 251 252 // Read all the records for this type table. 253 while (1) { 254 unsigned Code = Stream.ReadCode(); 255 if (Code == bitc::END_BLOCK) { 256 if (NumRecords != TypeList.size()) 257 return Error("Invalid type forward reference in TYPE_BLOCK"); 258 if (Stream.ReadBlockEnd()) 259 return Error("Error at end of type table block"); 260 return false; 261 } 262 263 if (Code == bitc::ENTER_SUBBLOCK) { 264 // No known subblocks, always skip them. 265 Stream.ReadSubBlockID(); 266 if (Stream.SkipBlock()) 267 return Error("Malformed block record"); 268 continue; 269 } 270 271 if (Code == bitc::DEFINE_ABBREV) { 272 Stream.ReadAbbrevRecord(); 273 continue; 274 } 275 276 // Read a record. 277 Record.clear(); 278 const Type *ResultTy = 0; 279 switch (Stream.ReadRecord(Code, Record)) { 280 default: // Default behavior: unknown type. 281 ResultTy = 0; 282 break; 283 case bitc::TYPE_CODE_NUMENTRY: // TYPE_CODE_NUMENTRY: [numentries] 284 // TYPE_CODE_NUMENTRY contains a count of the number of types in the 285 // type list. This allows us to reserve space. 286 if (Record.size() < 1) 287 return Error("Invalid TYPE_CODE_NUMENTRY record"); 288 TypeList.reserve(Record[0]); 289 continue; 290 case bitc::TYPE_CODE_VOID: // VOID 291 ResultTy = Type::VoidTy; 292 break; 293 case bitc::TYPE_CODE_FLOAT: // FLOAT 294 ResultTy = Type::FloatTy; 295 break; 296 case bitc::TYPE_CODE_DOUBLE: // DOUBLE 297 ResultTy = Type::DoubleTy; 298 break; 299 case bitc::TYPE_CODE_LABEL: // LABEL 300 ResultTy = Type::LabelTy; 301 break; 302 case bitc::TYPE_CODE_OPAQUE: // OPAQUE 303 ResultTy = 0; 304 break; 305 case bitc::TYPE_CODE_INTEGER: // INTEGER: [width] 306 if (Record.size() < 1) 307 return Error("Invalid Integer type record"); 308 309 ResultTy = IntegerType::get(Record[0]); 310 break; 311 case bitc::TYPE_CODE_POINTER: // POINTER: [pointee type] 312 if (Record.size() < 1) 313 return Error("Invalid POINTER type record"); 314 ResultTy = PointerType::get(getTypeByID(Record[0], true)); 315 break; 316 case bitc::TYPE_CODE_FUNCTION: { 317 // FUNCTION: [vararg, attrid, retty, paramty x N] 318 if (Record.size() < 3) 319 return Error("Invalid FUNCTION type record"); 320 std::vector<const Type*> ArgTys; 321 for (unsigned i = 3, e = Record.size(); i != e; ++i) 322 ArgTys.push_back(getTypeByID(Record[i], true)); 323 324 ResultTy = FunctionType::get(getTypeByID(Record[2], true), ArgTys, 325 Record[0], getParamAttrs(Record[1])); 326 break; 327 } 328 case bitc::TYPE_CODE_STRUCT: { // STRUCT: [ispacked, eltty x N] 329 if (Record.size() < 1) 330 return Error("Invalid STRUCT type record"); 331 std::vector<const Type*> EltTys; 332 for (unsigned i = 1, e = Record.size(); i != e; ++i) 333 EltTys.push_back(getTypeByID(Record[i], true)); 334 ResultTy = StructType::get(EltTys, Record[0]); 335 break; 336 } 337 case bitc::TYPE_CODE_ARRAY: // ARRAY: [numelts, eltty] 338 if (Record.size() < 2) 339 return Error("Invalid ARRAY type record"); 340 ResultTy = ArrayType::get(getTypeByID(Record[1], true), Record[0]); 341 break; 342 case bitc::TYPE_CODE_VECTOR: // VECTOR: [numelts, eltty] 343 if (Record.size() < 2) 344 return Error("Invalid VECTOR type record"); 345 ResultTy = VectorType::get(getTypeByID(Record[1], true), Record[0]); 346 break; 347 } 348 349 if (NumRecords == TypeList.size()) { 350 // If this is a new type slot, just append it. 351 TypeList.push_back(ResultTy ? ResultTy : OpaqueType::get()); 352 ++NumRecords; 353 } else if (ResultTy == 0) { 354 // Otherwise, this was forward referenced, so an opaque type was created, 355 // but the result type is actually just an opaque. Leave the one we 356 // created previously. 357 ++NumRecords; 358 } else { 359 // Otherwise, this was forward referenced, so an opaque type was created. 360 // Resolve the opaque type to the real type now. 361 assert(NumRecords < TypeList.size() && "Typelist imbalance"); 362 const OpaqueType *OldTy = cast<OpaqueType>(TypeList[NumRecords++].get()); 363 364 // Don't directly push the new type on the Tab. Instead we want to replace 365 // the opaque type we previously inserted with the new concrete value. The 366 // refinement from the abstract (opaque) type to the new type causes all 367 // uses of the abstract type to use the concrete type (NewTy). This will 368 // also cause the opaque type to be deleted. 369 const_cast<OpaqueType*>(OldTy)->refineAbstractTypeTo(ResultTy); 370 371 // This should have replaced the old opaque type with the new type in the 372 // value table... or with a preexisting type that was already in the 373 // system. Let's just make sure it did. 374 assert(TypeList[NumRecords-1].get() != OldTy && 375 "refineAbstractType didn't work!"); 376 } 377 } 378} 379 380 381bool BitcodeReader::ParseTypeSymbolTable() { 382 if (Stream.EnterSubBlock(bitc::TYPE_SYMTAB_BLOCK_ID)) 383 return Error("Malformed block record"); 384 385 SmallVector<uint64_t, 64> Record; 386 387 // Read all the records for this type table. 388 std::string TypeName; 389 while (1) { 390 unsigned Code = Stream.ReadCode(); 391 if (Code == bitc::END_BLOCK) { 392 if (Stream.ReadBlockEnd()) 393 return Error("Error at end of type symbol table block"); 394 return false; 395 } 396 397 if (Code == bitc::ENTER_SUBBLOCK) { 398 // No known subblocks, always skip them. 399 Stream.ReadSubBlockID(); 400 if (Stream.SkipBlock()) 401 return Error("Malformed block record"); 402 continue; 403 } 404 405 if (Code == bitc::DEFINE_ABBREV) { 406 Stream.ReadAbbrevRecord(); 407 continue; 408 } 409 410 // Read a record. 411 Record.clear(); 412 switch (Stream.ReadRecord(Code, Record)) { 413 default: // Default behavior: unknown type. 414 break; 415 case bitc::TST_CODE_ENTRY: // TST_ENTRY: [typeid, namechar x N] 416 if (ConvertToString(Record, 1, TypeName)) 417 return Error("Invalid TST_ENTRY record"); 418 unsigned TypeID = Record[0]; 419 if (TypeID >= TypeList.size()) 420 return Error("Invalid Type ID in TST_ENTRY record"); 421 422 TheModule->addTypeName(TypeName, TypeList[TypeID].get()); 423 TypeName.clear(); 424 break; 425 } 426 } 427} 428 429bool BitcodeReader::ParseValueSymbolTable() { 430 if (Stream.EnterSubBlock(bitc::VALUE_SYMTAB_BLOCK_ID)) 431 return Error("Malformed block record"); 432 433 SmallVector<uint64_t, 64> Record; 434 435 // Read all the records for this value table. 436 SmallString<128> ValueName; 437 while (1) { 438 unsigned Code = Stream.ReadCode(); 439 if (Code == bitc::END_BLOCK) { 440 if (Stream.ReadBlockEnd()) 441 return Error("Error at end of value symbol table block"); 442 return false; 443 } 444 if (Code == bitc::ENTER_SUBBLOCK) { 445 // No known subblocks, always skip them. 446 Stream.ReadSubBlockID(); 447 if (Stream.SkipBlock()) 448 return Error("Malformed block record"); 449 continue; 450 } 451 452 if (Code == bitc::DEFINE_ABBREV) { 453 Stream.ReadAbbrevRecord(); 454 continue; 455 } 456 457 // Read a record. 458 Record.clear(); 459 switch (Stream.ReadRecord(Code, Record)) { 460 default: // Default behavior: unknown type. 461 break; 462 case bitc::VST_CODE_ENTRY: { // VST_ENTRY: [valueid, namechar x N] 463 if (ConvertToString(Record, 1, ValueName)) 464 return Error("Invalid TST_ENTRY record"); 465 unsigned ValueID = Record[0]; 466 if (ValueID >= ValueList.size()) 467 return Error("Invalid Value ID in VST_ENTRY record"); 468 Value *V = ValueList[ValueID]; 469 470 V->setName(&ValueName[0], ValueName.size()); 471 ValueName.clear(); 472 break; 473 } 474 case bitc::VST_CODE_BBENTRY: { 475 if (ConvertToString(Record, 1, ValueName)) 476 return Error("Invalid VST_BBENTRY record"); 477 BasicBlock *BB = getBasicBlock(Record[0]); 478 if (BB == 0) 479 return Error("Invalid BB ID in VST_BBENTRY record"); 480 481 BB->setName(&ValueName[0], ValueName.size()); 482 ValueName.clear(); 483 break; 484 } 485 } 486 } 487} 488 489/// DecodeSignRotatedValue - Decode a signed value stored with the sign bit in 490/// the LSB for dense VBR encoding. 491static uint64_t DecodeSignRotatedValue(uint64_t V) { 492 if ((V & 1) == 0) 493 return V >> 1; 494 if (V != 1) 495 return -(V >> 1); 496 // There is no such thing as -0 with integers. "-0" really means MININT. 497 return 1ULL << 63; 498} 499 500/// ResolveGlobalAndAliasInits - Resolve all of the initializers for global 501/// values and aliases that we can. 502bool BitcodeReader::ResolveGlobalAndAliasInits() { 503 std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInitWorklist; 504 std::vector<std::pair<GlobalAlias*, unsigned> > AliasInitWorklist; 505 506 GlobalInitWorklist.swap(GlobalInits); 507 AliasInitWorklist.swap(AliasInits); 508 509 while (!GlobalInitWorklist.empty()) { 510 unsigned ValID = GlobalInitWorklist.back().second; 511 if (ValID >= ValueList.size()) { 512 // Not ready to resolve this yet, it requires something later in the file. 513 GlobalInits.push_back(GlobalInitWorklist.back()); 514 } else { 515 if (Constant *C = dyn_cast<Constant>(ValueList[ValID])) 516 GlobalInitWorklist.back().first->setInitializer(C); 517 else 518 return Error("Global variable initializer is not a constant!"); 519 } 520 GlobalInitWorklist.pop_back(); 521 } 522 523 while (!AliasInitWorklist.empty()) { 524 unsigned ValID = AliasInitWorklist.back().second; 525 if (ValID >= ValueList.size()) { 526 AliasInits.push_back(AliasInitWorklist.back()); 527 } else { 528 if (Constant *C = dyn_cast<Constant>(ValueList[ValID])) 529 AliasInitWorklist.back().first->setAliasee(C); 530 else 531 return Error("Alias initializer is not a constant!"); 532 } 533 AliasInitWorklist.pop_back(); 534 } 535 return false; 536} 537 538 539bool BitcodeReader::ParseConstants() { 540 if (Stream.EnterSubBlock(bitc::CONSTANTS_BLOCK_ID)) 541 return Error("Malformed block record"); 542 543 SmallVector<uint64_t, 64> Record; 544 545 // Read all the records for this value table. 546 const Type *CurTy = Type::Int32Ty; 547 unsigned NextCstNo = ValueList.size(); 548 while (1) { 549 unsigned Code = Stream.ReadCode(); 550 if (Code == bitc::END_BLOCK) { 551 if (NextCstNo != ValueList.size()) 552 return Error("Invalid constant reference!"); 553 554 if (Stream.ReadBlockEnd()) 555 return Error("Error at end of constants block"); 556 return false; 557 } 558 559 if (Code == bitc::ENTER_SUBBLOCK) { 560 // No known subblocks, always skip them. 561 Stream.ReadSubBlockID(); 562 if (Stream.SkipBlock()) 563 return Error("Malformed block record"); 564 continue; 565 } 566 567 if (Code == bitc::DEFINE_ABBREV) { 568 Stream.ReadAbbrevRecord(); 569 continue; 570 } 571 572 // Read a record. 573 Record.clear(); 574 Value *V = 0; 575 switch (Stream.ReadRecord(Code, Record)) { 576 default: // Default behavior: unknown constant 577 case bitc::CST_CODE_UNDEF: // UNDEF 578 V = UndefValue::get(CurTy); 579 break; 580 case bitc::CST_CODE_SETTYPE: // SETTYPE: [typeid] 581 if (Record.empty()) 582 return Error("Malformed CST_SETTYPE record"); 583 if (Record[0] >= TypeList.size()) 584 return Error("Invalid Type ID in CST_SETTYPE record"); 585 CurTy = TypeList[Record[0]]; 586 continue; // Skip the ValueList manipulation. 587 case bitc::CST_CODE_NULL: // NULL 588 V = Constant::getNullValue(CurTy); 589 break; 590 case bitc::CST_CODE_INTEGER: // INTEGER: [intval] 591 if (!isa<IntegerType>(CurTy) || Record.empty()) 592 return Error("Invalid CST_INTEGER record"); 593 V = ConstantInt::get(CurTy, DecodeSignRotatedValue(Record[0])); 594 break; 595 case bitc::CST_CODE_WIDE_INTEGER: {// WIDE_INTEGER: [n x intval] 596 if (!isa<IntegerType>(CurTy) || Record.empty()) 597 return Error("Invalid WIDE_INTEGER record"); 598 599 unsigned NumWords = Record.size(); 600 SmallVector<uint64_t, 8> Words; 601 Words.resize(NumWords); 602 for (unsigned i = 0; i != NumWords; ++i) 603 Words[i] = DecodeSignRotatedValue(Record[i]); 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 x value number] 620 if (Record.empty()) 621 return Error("Invalid CST_AGGREGATE record"); 622 623 unsigned Size = Record.size(); 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], 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], 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], EltTy)); 640 V = ConstantVector::get(Elts); 641 } else { 642 V = UndefValue::get(CurTy); 643 } 644 break; 645 } 646 case bitc::CST_CODE_STRING: { // STRING: [values] 647 if (Record.empty()) 648 return Error("Invalid CST_AGGREGATE record"); 649 650 const ArrayType *ATy = cast<ArrayType>(CurTy); 651 const Type *EltTy = ATy->getElementType(); 652 653 unsigned Size = Record.size(); 654 std::vector<Constant*> Elts; 655 for (unsigned i = 0; i != Size; ++i) 656 Elts.push_back(ConstantInt::get(EltTy, Record[i])); 657 V = ConstantArray::get(ATy, Elts); 658 break; 659 } 660 case bitc::CST_CODE_CSTRING: { // CSTRING: [values] 661 if (Record.empty()) 662 return Error("Invalid CST_AGGREGATE record"); 663 664 const ArrayType *ATy = cast<ArrayType>(CurTy); 665 const Type *EltTy = ATy->getElementType(); 666 667 unsigned Size = Record.size(); 668 std::vector<Constant*> Elts; 669 for (unsigned i = 0; i != Size; ++i) 670 Elts.push_back(ConstantInt::get(EltTy, Record[i])); 671 Elts.push_back(Constant::getNullValue(EltTy)); 672 V = ConstantArray::get(ATy, Elts); 673 break; 674 } 675 case bitc::CST_CODE_CE_BINOP: { // CE_BINOP: [opcode, opval, opval] 676 if (Record.size() < 3) return Error("Invalid CE_BINOP record"); 677 int Opc = GetDecodedBinaryOpcode(Record[0], CurTy); 678 if (Opc < 0) { 679 V = UndefValue::get(CurTy); // Unknown binop. 680 } else { 681 Constant *LHS = ValueList.getConstantFwdRef(Record[1], CurTy); 682 Constant *RHS = ValueList.getConstantFwdRef(Record[2], CurTy); 683 V = ConstantExpr::get(Opc, LHS, RHS); 684 } 685 break; 686 } 687 case bitc::CST_CODE_CE_CAST: { // CE_CAST: [opcode, opty, opval] 688 if (Record.size() < 3) return Error("Invalid CE_CAST record"); 689 int Opc = GetDecodedCastOpcode(Record[0]); 690 if (Opc < 0) { 691 V = UndefValue::get(CurTy); // Unknown cast. 692 } else { 693 const Type *OpTy = getTypeByID(Record[1]); 694 if (!OpTy) return Error("Invalid CE_CAST record"); 695 Constant *Op = ValueList.getConstantFwdRef(Record[2], OpTy); 696 V = ConstantExpr::getCast(Opc, Op, CurTy); 697 } 698 break; 699 } 700 case bitc::CST_CODE_CE_GEP: { // CE_GEP: [n x operands] 701 if (Record.size() & 1) return Error("Invalid CE_GEP record"); 702 SmallVector<Constant*, 16> Elts; 703 for (unsigned i = 0, e = Record.size(); i != e; i += 2) { 704 const Type *ElTy = getTypeByID(Record[i]); 705 if (!ElTy) return Error("Invalid CE_GEP record"); 706 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], ElTy)); 707 } 708 V = ConstantExpr::getGetElementPtr(Elts[0], &Elts[1], Elts.size()-1); 709 break; 710 } 711 case bitc::CST_CODE_CE_SELECT: // CE_SELECT: [opval#, opval#, opval#] 712 if (Record.size() < 3) return Error("Invalid CE_SELECT record"); 713 V = ConstantExpr::getSelect(ValueList.getConstantFwdRef(Record[0], 714 Type::Int1Ty), 715 ValueList.getConstantFwdRef(Record[1],CurTy), 716 ValueList.getConstantFwdRef(Record[2],CurTy)); 717 break; 718 case bitc::CST_CODE_CE_EXTRACTELT: { // CE_EXTRACTELT: [opty, opval, opval] 719 if (Record.size() < 3) return Error("Invalid CE_EXTRACTELT record"); 720 const VectorType *OpTy = 721 dyn_cast_or_null<VectorType>(getTypeByID(Record[0])); 722 if (OpTy == 0) return Error("Invalid CE_EXTRACTELT record"); 723 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 724 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], 725 OpTy->getElementType()); 726 V = ConstantExpr::getExtractElement(Op0, Op1); 727 break; 728 } 729 case bitc::CST_CODE_CE_INSERTELT: { // CE_INSERTELT: [opval, opval, opval] 730 const VectorType *OpTy = dyn_cast<VectorType>(CurTy); 731 if (Record.size() < 3 || OpTy == 0) 732 return Error("Invalid CE_INSERTELT record"); 733 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); 734 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], 735 OpTy->getElementType()); 736 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], Type::Int32Ty); 737 V = ConstantExpr::getInsertElement(Op0, Op1, Op2); 738 break; 739 } 740 case bitc::CST_CODE_CE_SHUFFLEVEC: { // CE_SHUFFLEVEC: [opval, opval, opval] 741 const VectorType *OpTy = dyn_cast<VectorType>(CurTy); 742 if (Record.size() < 3 || OpTy == 0) 743 return Error("Invalid CE_INSERTELT record"); 744 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); 745 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], OpTy); 746 const Type *ShufTy=VectorType::get(Type::Int32Ty, OpTy->getNumElements()); 747 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], ShufTy); 748 V = ConstantExpr::getShuffleVector(Op0, Op1, Op2); 749 break; 750 } 751 case bitc::CST_CODE_CE_CMP: { // CE_CMP: [opty, opval, opval, pred] 752 if (Record.size() < 4) return Error("Invalid CE_CMP record"); 753 const Type *OpTy = getTypeByID(Record[0]); 754 if (OpTy == 0) return Error("Invalid CE_CMP record"); 755 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 756 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy); 757 758 if (OpTy->isFloatingPoint()) 759 V = ConstantExpr::getFCmp(Record[3], Op0, Op1); 760 else 761 V = ConstantExpr::getICmp(Record[3], Op0, Op1); 762 break; 763 } 764 case bitc::CST_CODE_INLINEASM: { 765 if (Record.size() < 2) return Error("Invalid INLINEASM record"); 766 std::string AsmStr, ConstrStr; 767 bool HasSideEffects = Record[0]; 768 unsigned AsmStrSize = Record[1]; 769 if (2+AsmStrSize >= Record.size()) 770 return Error("Invalid INLINEASM record"); 771 unsigned ConstStrSize = Record[2+AsmStrSize]; 772 if (3+AsmStrSize+ConstStrSize > Record.size()) 773 return Error("Invalid INLINEASM record"); 774 775 for (unsigned i = 0; i != AsmStrSize; ++i) 776 AsmStr += (char)Record[2+i]; 777 for (unsigned i = 0; i != ConstStrSize; ++i) 778 ConstrStr += (char)Record[3+AsmStrSize+i]; 779 const PointerType *PTy = cast<PointerType>(CurTy); 780 V = InlineAsm::get(cast<FunctionType>(PTy->getElementType()), 781 AsmStr, ConstrStr, HasSideEffects); 782 break; 783 } 784 } 785 786 ValueList.AssignValue(V, NextCstNo); 787 ++NextCstNo; 788 } 789} 790 791/// RememberAndSkipFunctionBody - When we see the block for a function body, 792/// remember where it is and then skip it. This lets us lazily deserialize the 793/// functions. 794bool BitcodeReader::RememberAndSkipFunctionBody() { 795 // Get the function we are talking about. 796 if (FunctionsWithBodies.empty()) 797 return Error("Insufficient function protos"); 798 799 Function *Fn = FunctionsWithBodies.back(); 800 FunctionsWithBodies.pop_back(); 801 802 // Save the current stream state. 803 uint64_t CurBit = Stream.GetCurrentBitNo(); 804 DeferredFunctionInfo[Fn] = std::make_pair(CurBit, Fn->getLinkage()); 805 806 // Set the functions linkage to GhostLinkage so we know it is lazily 807 // deserialized. 808 Fn->setLinkage(GlobalValue::GhostLinkage); 809 810 // Skip over the function block for now. 811 if (Stream.SkipBlock()) 812 return Error("Malformed block record"); 813 return false; 814} 815 816bool BitcodeReader::ParseModule(const std::string &ModuleID) { 817 // Reject multiple MODULE_BLOCK's in a single bitstream. 818 if (TheModule) 819 return Error("Multiple MODULE_BLOCKs in same stream"); 820 821 if (Stream.EnterSubBlock(bitc::MODULE_BLOCK_ID)) 822 return Error("Malformed block record"); 823 824 // Otherwise, create the module. 825 TheModule = new Module(ModuleID); 826 827 SmallVector<uint64_t, 64> Record; 828 std::vector<std::string> SectionTable; 829 830 // Read all the records for this module. 831 while (!Stream.AtEndOfStream()) { 832 unsigned Code = Stream.ReadCode(); 833 if (Code == bitc::END_BLOCK) { 834 if (Stream.ReadBlockEnd()) 835 return Error("Error at end of module block"); 836 837 // Patch the initializers for globals and aliases up. 838 ResolveGlobalAndAliasInits(); 839 if (!GlobalInits.empty() || !AliasInits.empty()) 840 return Error("Malformed global initializer set"); 841 if (!FunctionsWithBodies.empty()) 842 return Error("Too few function bodies found"); 843 844 // Force deallocation of memory for these vectors to favor the client that 845 // want lazy deserialization. 846 std::vector<std::pair<GlobalVariable*, unsigned> >().swap(GlobalInits); 847 std::vector<std::pair<GlobalAlias*, unsigned> >().swap(AliasInits); 848 std::vector<Function*>().swap(FunctionsWithBodies); 849 return false; 850 } 851 852 if (Code == bitc::ENTER_SUBBLOCK) { 853 switch (Stream.ReadSubBlockID()) { 854 default: // Skip unknown content. 855 if (Stream.SkipBlock()) 856 return Error("Malformed block record"); 857 break; 858 case bitc::BLOCKINFO_BLOCK_ID: 859 if (Stream.ReadBlockInfoBlock()) 860 return Error("Malformed BlockInfoBlock"); 861 break; 862 case bitc::PARAMATTR_BLOCK_ID: 863 if (ParseParamAttrBlock()) 864 return true; 865 break; 866 case bitc::TYPE_BLOCK_ID: 867 if (ParseTypeTable()) 868 return true; 869 break; 870 case bitc::TYPE_SYMTAB_BLOCK_ID: 871 if (ParseTypeSymbolTable()) 872 return true; 873 break; 874 case bitc::VALUE_SYMTAB_BLOCK_ID: 875 if (ParseValueSymbolTable()) 876 return true; 877 break; 878 case bitc::CONSTANTS_BLOCK_ID: 879 if (ParseConstants() || ResolveGlobalAndAliasInits()) 880 return true; 881 break; 882 case bitc::FUNCTION_BLOCK_ID: 883 // If this is the first function body we've seen, reverse the 884 // FunctionsWithBodies list. 885 if (!HasReversedFunctionsWithBodies) { 886 std::reverse(FunctionsWithBodies.begin(), FunctionsWithBodies.end()); 887 HasReversedFunctionsWithBodies = true; 888 } 889 890 if (RememberAndSkipFunctionBody()) 891 return true; 892 break; 893 } 894 continue; 895 } 896 897 if (Code == bitc::DEFINE_ABBREV) { 898 Stream.ReadAbbrevRecord(); 899 continue; 900 } 901 902 // Read a record. 903 switch (Stream.ReadRecord(Code, Record)) { 904 default: break; // Default behavior, ignore unknown content. 905 case bitc::MODULE_CODE_VERSION: // VERSION: [version#] 906 if (Record.size() < 1) 907 return Error("Malformed MODULE_CODE_VERSION"); 908 // Only version #0 is supported so far. 909 if (Record[0] != 0) 910 return Error("Unknown bitstream version!"); 911 break; 912 case bitc::MODULE_CODE_TRIPLE: { // TRIPLE: [strchr x N] 913 std::string S; 914 if (ConvertToString(Record, 0, S)) 915 return Error("Invalid MODULE_CODE_TRIPLE record"); 916 TheModule->setTargetTriple(S); 917 break; 918 } 919 case bitc::MODULE_CODE_DATALAYOUT: { // DATALAYOUT: [strchr x N] 920 std::string S; 921 if (ConvertToString(Record, 0, S)) 922 return Error("Invalid MODULE_CODE_DATALAYOUT record"); 923 TheModule->setDataLayout(S); 924 break; 925 } 926 case bitc::MODULE_CODE_ASM: { // ASM: [strchr x N] 927 std::string S; 928 if (ConvertToString(Record, 0, S)) 929 return Error("Invalid MODULE_CODE_ASM record"); 930 TheModule->setModuleInlineAsm(S); 931 break; 932 } 933 case bitc::MODULE_CODE_DEPLIB: { // DEPLIB: [strchr x N] 934 std::string S; 935 if (ConvertToString(Record, 0, S)) 936 return Error("Invalid MODULE_CODE_DEPLIB record"); 937 TheModule->addLibrary(S); 938 break; 939 } 940 case bitc::MODULE_CODE_SECTIONNAME: { // SECTIONNAME: [strchr x N] 941 std::string S; 942 if (ConvertToString(Record, 0, S)) 943 return Error("Invalid MODULE_CODE_SECTIONNAME record"); 944 SectionTable.push_back(S); 945 break; 946 } 947 // GLOBALVAR: [type, isconst, initid, 948 // linkage, alignment, section, visibility, threadlocal] 949 case bitc::MODULE_CODE_GLOBALVAR: { 950 if (Record.size() < 6) 951 return Error("Invalid MODULE_CODE_GLOBALVAR record"); 952 const Type *Ty = getTypeByID(Record[0]); 953 if (!isa<PointerType>(Ty)) 954 return Error("Global not a pointer type!"); 955 Ty = cast<PointerType>(Ty)->getElementType(); 956 957 bool isConstant = Record[1]; 958 GlobalValue::LinkageTypes Linkage = GetDecodedLinkage(Record[3]); 959 unsigned Alignment = (1 << Record[4]) >> 1; 960 std::string Section; 961 if (Record[5]) { 962 if (Record[5]-1 >= SectionTable.size()) 963 return Error("Invalid section ID"); 964 Section = SectionTable[Record[5]-1]; 965 } 966 GlobalValue::VisibilityTypes Visibility = GlobalValue::DefaultVisibility; 967 if (Record.size() > 6) 968 Visibility = GetDecodedVisibility(Record[6]); 969 bool isThreadLocal = false; 970 if (Record.size() > 7) 971 isThreadLocal = Record[7]; 972 973 GlobalVariable *NewGV = 974 new GlobalVariable(Ty, isConstant, Linkage, 0, "", TheModule); 975 NewGV->setAlignment(Alignment); 976 if (!Section.empty()) 977 NewGV->setSection(Section); 978 NewGV->setVisibility(Visibility); 979 NewGV->setThreadLocal(isThreadLocal); 980 981 ValueList.push_back(NewGV); 982 983 // Remember which value to use for the global initializer. 984 if (unsigned InitID = Record[2]) 985 GlobalInits.push_back(std::make_pair(NewGV, InitID-1)); 986 break; 987 } 988 // FUNCTION: [type, callingconv, isproto, linkage, paramattr, 989 // alignment, section, visibility] 990 case bitc::MODULE_CODE_FUNCTION: { 991 if (Record.size() < 8) 992 return Error("Invalid MODULE_CODE_FUNCTION record"); 993 const Type *Ty = getTypeByID(Record[0]); 994 if (!isa<PointerType>(Ty)) 995 return Error("Function not a pointer type!"); 996 const FunctionType *FTy = 997 dyn_cast<FunctionType>(cast<PointerType>(Ty)->getElementType()); 998 if (!FTy) 999 return Error("Function not a pointer to function type!"); 1000 1001 Function *Func = new Function(FTy, GlobalValue::ExternalLinkage, 1002 "", TheModule); 1003 1004 Func->setCallingConv(Record[1]); 1005 bool isProto = Record[2]; 1006 Func->setLinkage(GetDecodedLinkage(Record[3])); 1007 1008 assert(Func->getFunctionType()->getParamAttrs() == 1009 getParamAttrs(Record[4])); 1010 1011 Func->setAlignment((1 << Record[5]) >> 1); 1012 if (Record[6]) { 1013 if (Record[6]-1 >= SectionTable.size()) 1014 return Error("Invalid section ID"); 1015 Func->setSection(SectionTable[Record[6]-1]); 1016 } 1017 Func->setVisibility(GetDecodedVisibility(Record[7])); 1018 1019 ValueList.push_back(Func); 1020 1021 // If this is a function with a body, remember the prototype we are 1022 // creating now, so that we can match up the body with them later. 1023 if (!isProto) 1024 FunctionsWithBodies.push_back(Func); 1025 break; 1026 } 1027 // ALIAS: [alias type, aliasee val#, linkage] 1028 case bitc::MODULE_CODE_ALIAS: { 1029 if (Record.size() < 3) 1030 return Error("Invalid MODULE_ALIAS record"); 1031 const Type *Ty = getTypeByID(Record[0]); 1032 if (!isa<PointerType>(Ty)) 1033 return Error("Function not a pointer type!"); 1034 1035 GlobalAlias *NewGA = new GlobalAlias(Ty, GetDecodedLinkage(Record[2]), 1036 "", 0, TheModule); 1037 ValueList.push_back(NewGA); 1038 AliasInits.push_back(std::make_pair(NewGA, Record[1])); 1039 break; 1040 } 1041 /// MODULE_CODE_PURGEVALS: [numvals] 1042 case bitc::MODULE_CODE_PURGEVALS: 1043 // Trim down the value list to the specified size. 1044 if (Record.size() < 1 || Record[0] > ValueList.size()) 1045 return Error("Invalid MODULE_PURGEVALS record"); 1046 ValueList.shrinkTo(Record[0]); 1047 break; 1048 } 1049 Record.clear(); 1050 } 1051 1052 return Error("Premature end of bitstream"); 1053} 1054 1055 1056bool BitcodeReader::ParseBitcode() { 1057 TheModule = 0; 1058 1059 if (Buffer->getBufferSize() & 3) 1060 return Error("Bitcode stream should be a multiple of 4 bytes in length"); 1061 1062 unsigned char *BufPtr = (unsigned char *)Buffer->getBufferStart(); 1063 Stream.init(BufPtr, BufPtr+Buffer->getBufferSize()); 1064 1065 // Sniff for the signature. 1066 if (Stream.Read(8) != 'B' || 1067 Stream.Read(8) != 'C' || 1068 Stream.Read(4) != 0x0 || 1069 Stream.Read(4) != 0xC || 1070 Stream.Read(4) != 0xE || 1071 Stream.Read(4) != 0xD) 1072 return Error("Invalid bitcode signature"); 1073 1074 // We expect a number of well-defined blocks, though we don't necessarily 1075 // need to understand them all. 1076 while (!Stream.AtEndOfStream()) { 1077 unsigned Code = Stream.ReadCode(); 1078 1079 if (Code != bitc::ENTER_SUBBLOCK) 1080 return Error("Invalid record at top-level"); 1081 1082 unsigned BlockID = Stream.ReadSubBlockID(); 1083 1084 // We only know the MODULE subblock ID. 1085 switch (BlockID) { 1086 case bitc::BLOCKINFO_BLOCK_ID: 1087 if (Stream.ReadBlockInfoBlock()) 1088 return Error("Malformed BlockInfoBlock"); 1089 break; 1090 case bitc::MODULE_BLOCK_ID: 1091 if (ParseModule(Buffer->getBufferIdentifier())) 1092 return true; 1093 break; 1094 default: 1095 if (Stream.SkipBlock()) 1096 return Error("Malformed block record"); 1097 break; 1098 } 1099 } 1100 1101 return false; 1102} 1103 1104 1105bool BitcodeReader::materializeFunction(Function *F, std::string *ErrInfo) { 1106 // If it already is material, ignore the request. 1107 if (!F->hasNotBeenReadFromBytecode()) return false; 1108 1109 DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator DFII = 1110 DeferredFunctionInfo.find(F); 1111 assert(DFII != DeferredFunctionInfo.end() && "Deferred function not found!"); 1112 1113 // Move the bit stream to the saved position of the deferred function body and 1114 // restore the real linkage type for the function. 1115 Stream.JumpToBit(DFII->second.first); 1116 F->setLinkage((GlobalValue::LinkageTypes)DFII->second.second); 1117 1118 if (ParseFunctionBody(F)) { 1119 if (ErrInfo) *ErrInfo = ErrorString; 1120 return true; 1121 } 1122 1123 return false; 1124} 1125 1126void BitcodeReader::dematerializeFunction(Function *F) { 1127 // If this function isn't materialized, or if it is a proto, this is a noop. 1128 if (F->hasNotBeenReadFromBytecode() || F->isDeclaration()) 1129 return; 1130 1131 assert(DeferredFunctionInfo.count(F) && "No info to read function later?"); 1132 1133 // Just forget the function body, we can remat it later. 1134 F->deleteBody(); 1135 F->setLinkage(GlobalValue::GhostLinkage); 1136} 1137 1138 1139Module *BitcodeReader::materializeModule(std::string *ErrInfo) { 1140 for (DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator I = 1141 DeferredFunctionInfo.begin(), E = DeferredFunctionInfo.end(); I != E; 1142 ++I) { 1143 Function *F = I->first; 1144 if (F->hasNotBeenReadFromBytecode() && 1145 materializeFunction(F, ErrInfo)) 1146 return 0; 1147 } 1148 return TheModule; 1149} 1150 1151 1152/// ParseFunctionBody - Lazily parse the specified function body block. 1153bool BitcodeReader::ParseFunctionBody(Function *F) { 1154 if (Stream.EnterSubBlock(bitc::FUNCTION_BLOCK_ID)) 1155 return Error("Malformed block record"); 1156 1157 unsigned ModuleValueListSize = ValueList.size(); 1158 1159 // Add all the function arguments to the value table. 1160 for(Function::arg_iterator I = F->arg_begin(), E = F->arg_end(); I != E; ++I) 1161 ValueList.push_back(I); 1162 1163 unsigned NextValueNo = ValueList.size(); 1164 BasicBlock *CurBB = 0; 1165 unsigned CurBBNo = 0; 1166 1167 // Read all the records. 1168 SmallVector<uint64_t, 64> Record; 1169 while (1) { 1170 unsigned Code = Stream.ReadCode(); 1171 if (Code == bitc::END_BLOCK) { 1172 if (Stream.ReadBlockEnd()) 1173 return Error("Error at end of function block"); 1174 break; 1175 } 1176 1177 if (Code == bitc::ENTER_SUBBLOCK) { 1178 switch (Stream.ReadSubBlockID()) { 1179 default: // Skip unknown content. 1180 if (Stream.SkipBlock()) 1181 return Error("Malformed block record"); 1182 break; 1183 case bitc::CONSTANTS_BLOCK_ID: 1184 if (ParseConstants()) return true; 1185 NextValueNo = ValueList.size(); 1186 break; 1187 case bitc::VALUE_SYMTAB_BLOCK_ID: 1188 if (ParseValueSymbolTable()) return true; 1189 break; 1190 } 1191 continue; 1192 } 1193 1194 if (Code == bitc::DEFINE_ABBREV) { 1195 Stream.ReadAbbrevRecord(); 1196 continue; 1197 } 1198 1199 // Read a record. 1200 Record.clear(); 1201 Instruction *I = 0; 1202 switch (Stream.ReadRecord(Code, Record)) { 1203 default: // Default behavior: reject 1204 return Error("Unknown instruction"); 1205 case bitc::FUNC_CODE_DECLAREBLOCKS: // DECLAREBLOCKS: [nblocks] 1206 if (Record.size() < 1 || Record[0] == 0) 1207 return Error("Invalid DECLAREBLOCKS record"); 1208 // Create all the basic blocks for the function. 1209 FunctionBBs.resize(Record[0]); 1210 for (unsigned i = 0, e = FunctionBBs.size(); i != e; ++i) 1211 FunctionBBs[i] = new BasicBlock("", F); 1212 CurBB = FunctionBBs[0]; 1213 continue; 1214 1215 case bitc::FUNC_CODE_INST_BINOP: { // BINOP: [opval, ty, opval, opcode] 1216 unsigned OpNum = 0; 1217 Value *LHS, *RHS; 1218 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) || 1219 getValue(Record, OpNum, LHS->getType(), RHS) || 1220 OpNum+1 != Record.size()) 1221 return Error("Invalid BINOP record"); 1222 1223 int Opc = GetDecodedBinaryOpcode(Record[OpNum], LHS->getType()); 1224 if (Opc == -1) return Error("Invalid BINOP record"); 1225 I = BinaryOperator::create((Instruction::BinaryOps)Opc, LHS, RHS); 1226 break; 1227 } 1228 case bitc::FUNC_CODE_INST_CAST: { // CAST: [opval, opty, destty, castopc] 1229 unsigned OpNum = 0; 1230 Value *Op; 1231 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1232 OpNum+2 != Record.size()) 1233 return Error("Invalid CAST record"); 1234 1235 const Type *ResTy = getTypeByID(Record[OpNum]); 1236 int Opc = GetDecodedCastOpcode(Record[OpNum+1]); 1237 if (Opc == -1 || ResTy == 0) 1238 return Error("Invalid CAST record"); 1239 I = CastInst::create((Instruction::CastOps)Opc, Op, ResTy); 1240 break; 1241 } 1242 case bitc::FUNC_CODE_INST_GEP: { // GEP: [n x operands] 1243 unsigned OpNum = 0; 1244 Value *BasePtr; 1245 if (getValueTypePair(Record, OpNum, NextValueNo, BasePtr)) 1246 return Error("Invalid GEP record"); 1247 1248 SmallVector<Value*, 16> GEPIdx; 1249 while (OpNum != Record.size()) { 1250 Value *Op; 1251 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 1252 return Error("Invalid GEP record"); 1253 GEPIdx.push_back(Op); 1254 } 1255 1256 I = new GetElementPtrInst(BasePtr, &GEPIdx[0], GEPIdx.size()); 1257 break; 1258 } 1259 1260 case bitc::FUNC_CODE_INST_SELECT: { // SELECT: [opval, ty, opval, opval] 1261 unsigned OpNum = 0; 1262 Value *TrueVal, *FalseVal, *Cond; 1263 if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) || 1264 getValue(Record, OpNum, TrueVal->getType(), FalseVal) || 1265 getValue(Record, OpNum, Type::Int1Ty, Cond)) 1266 return Error("Invalid SELECT record"); 1267 1268 I = new SelectInst(Cond, TrueVal, FalseVal); 1269 break; 1270 } 1271 1272 case bitc::FUNC_CODE_INST_EXTRACTELT: { // EXTRACTELT: [opty, opval, opval] 1273 unsigned OpNum = 0; 1274 Value *Vec, *Idx; 1275 if (getValueTypePair(Record, OpNum, NextValueNo, Vec) || 1276 getValue(Record, OpNum, Type::Int32Ty, Idx)) 1277 return Error("Invalid EXTRACTELT record"); 1278 I = new ExtractElementInst(Vec, Idx); 1279 break; 1280 } 1281 1282 case bitc::FUNC_CODE_INST_INSERTELT: { // INSERTELT: [ty, opval,opval,opval] 1283 unsigned OpNum = 0; 1284 Value *Vec, *Elt, *Idx; 1285 if (getValueTypePair(Record, OpNum, NextValueNo, Vec) || 1286 getValue(Record, OpNum, 1287 cast<VectorType>(Vec->getType())->getElementType(), Elt) || 1288 getValue(Record, OpNum, Type::Int32Ty, Idx)) 1289 return Error("Invalid INSERTELT record"); 1290 I = new InsertElementInst(Vec, Elt, Idx); 1291 break; 1292 } 1293 1294 case bitc::FUNC_CODE_INST_SHUFFLEVEC: {// SHUFFLEVEC: [opval,ty,opval,opval] 1295 unsigned OpNum = 0; 1296 Value *Vec1, *Vec2, *Mask; 1297 if (getValueTypePair(Record, OpNum, NextValueNo, Vec1) || 1298 getValue(Record, OpNum, Vec1->getType(), Vec2)) 1299 return Error("Invalid SHUFFLEVEC record"); 1300 1301 const Type *MaskTy = 1302 VectorType::get(Type::Int32Ty, 1303 cast<VectorType>(Vec1->getType())->getNumElements()); 1304 1305 if (getValue(Record, OpNum, MaskTy, Mask)) 1306 return Error("Invalid SHUFFLEVEC record"); 1307 I = new ShuffleVectorInst(Vec1, Vec2, Mask); 1308 break; 1309 } 1310 1311 case bitc::FUNC_CODE_INST_CMP: { // CMP: [opty, opval, opval, pred] 1312 unsigned OpNum = 0; 1313 Value *LHS, *RHS; 1314 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) || 1315 getValue(Record, OpNum, LHS->getType(), RHS) || 1316 OpNum+1 != Record.size()) 1317 return Error("Invalid CMP record"); 1318 1319 if (LHS->getType()->isFPOrFPVector()) 1320 I = new FCmpInst((FCmpInst::Predicate)Record[OpNum], LHS, RHS); 1321 else 1322 I = new ICmpInst((ICmpInst::Predicate)Record[OpNum], LHS, RHS); 1323 break; 1324 } 1325 1326 case bitc::FUNC_CODE_INST_RET: // RET: [opty,opval<optional>] 1327 if (Record.size() == 0) { 1328 I = new ReturnInst(); 1329 break; 1330 } else { 1331 unsigned OpNum = 0; 1332 Value *Op; 1333 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1334 OpNum != Record.size()) 1335 return Error("Invalid RET record"); 1336 I = new ReturnInst(Op); 1337 break; 1338 } 1339 case bitc::FUNC_CODE_INST_BR: { // BR: [bb#, bb#, opval] or [bb#] 1340 if (Record.size() != 1 && Record.size() != 3) 1341 return Error("Invalid BR record"); 1342 BasicBlock *TrueDest = getBasicBlock(Record[0]); 1343 if (TrueDest == 0) 1344 return Error("Invalid BR record"); 1345 1346 if (Record.size() == 1) 1347 I = new BranchInst(TrueDest); 1348 else { 1349 BasicBlock *FalseDest = getBasicBlock(Record[1]); 1350 Value *Cond = getFnValueByID(Record[2], Type::Int1Ty); 1351 if (FalseDest == 0 || Cond == 0) 1352 return Error("Invalid BR record"); 1353 I = new BranchInst(TrueDest, FalseDest, Cond); 1354 } 1355 break; 1356 } 1357 case bitc::FUNC_CODE_INST_SWITCH: { // SWITCH: [opty, opval, n, n x ops] 1358 if (Record.size() < 3 || (Record.size() & 1) == 0) 1359 return Error("Invalid SWITCH record"); 1360 const Type *OpTy = getTypeByID(Record[0]); 1361 Value *Cond = getFnValueByID(Record[1], OpTy); 1362 BasicBlock *Default = getBasicBlock(Record[2]); 1363 if (OpTy == 0 || Cond == 0 || Default == 0) 1364 return Error("Invalid SWITCH record"); 1365 unsigned NumCases = (Record.size()-3)/2; 1366 SwitchInst *SI = new SwitchInst(Cond, Default, NumCases); 1367 for (unsigned i = 0, e = NumCases; i != e; ++i) { 1368 ConstantInt *CaseVal = 1369 dyn_cast_or_null<ConstantInt>(getFnValueByID(Record[3+i*2], OpTy)); 1370 BasicBlock *DestBB = getBasicBlock(Record[1+3+i*2]); 1371 if (CaseVal == 0 || DestBB == 0) { 1372 delete SI; 1373 return Error("Invalid SWITCH record!"); 1374 } 1375 SI->addCase(CaseVal, DestBB); 1376 } 1377 I = SI; 1378 break; 1379 } 1380 1381 case bitc::FUNC_CODE_INST_INVOKE: { // INVOKE: [cc,fnty, op0,op1,op2, ...] 1382 if (Record.size() < 4) return Error("Invalid INVOKE record"); 1383 unsigned CCInfo = Record[1]; 1384 BasicBlock *NormalBB = getBasicBlock(Record[2]); 1385 BasicBlock *UnwindBB = getBasicBlock(Record[3]); 1386 1387 unsigned OpNum = 4; 1388 Value *Callee; 1389 if (getValueTypePair(Record, OpNum, NextValueNo, Callee)) 1390 return Error("Invalid INVOKE record"); 1391 1392 const PointerType *CalleeTy = dyn_cast<PointerType>(Callee->getType()); 1393 const FunctionType *FTy = !CalleeTy ? 0 : 1394 dyn_cast<FunctionType>(CalleeTy->getElementType()); 1395 1396 // Check that the right number of fixed parameters are here. 1397 if (FTy == 0 || NormalBB == 0 || UnwindBB == 0 || 1398 Record.size() < OpNum+FTy->getNumParams()) 1399 return Error("Invalid INVOKE record"); 1400 1401 assert(FTy->getParamAttrs() == getParamAttrs(Record[0])); 1402 1403 SmallVector<Value*, 16> Ops; 1404 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) { 1405 Ops.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i))); 1406 if (Ops.back() == 0) return Error("Invalid INVOKE record"); 1407 } 1408 1409 if (!FTy->isVarArg()) { 1410 if (Record.size() != OpNum) 1411 return Error("Invalid INVOKE record"); 1412 } else { 1413 // Read type/value pairs for varargs params. 1414 while (OpNum != Record.size()) { 1415 Value *Op; 1416 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 1417 return Error("Invalid INVOKE record"); 1418 Ops.push_back(Op); 1419 } 1420 } 1421 1422 I = new InvokeInst(Callee, NormalBB, UnwindBB, &Ops[0], Ops.size()); 1423 cast<InvokeInst>(I)->setCallingConv(CCInfo); 1424 break; 1425 } 1426 case bitc::FUNC_CODE_INST_UNWIND: // UNWIND 1427 I = new UnwindInst(); 1428 break; 1429 case bitc::FUNC_CODE_INST_UNREACHABLE: // UNREACHABLE 1430 I = new UnreachableInst(); 1431 break; 1432 case bitc::FUNC_CODE_INST_PHI: { // PHI: [ty, val0,bb0, ...] 1433 if (Record.size() < 1 || ((Record.size()-1)&1)) 1434 return Error("Invalid PHI record"); 1435 const Type *Ty = getTypeByID(Record[0]); 1436 if (!Ty) return Error("Invalid PHI record"); 1437 1438 PHINode *PN = new PHINode(Ty); 1439 PN->reserveOperandSpace(Record.size()-1); 1440 1441 for (unsigned i = 0, e = Record.size()-1; i != e; i += 2) { 1442 Value *V = getFnValueByID(Record[1+i], Ty); 1443 BasicBlock *BB = getBasicBlock(Record[2+i]); 1444 if (!V || !BB) return Error("Invalid PHI record"); 1445 PN->addIncoming(V, BB); 1446 } 1447 I = PN; 1448 break; 1449 } 1450 1451 case bitc::FUNC_CODE_INST_MALLOC: { // MALLOC: [instty, op, align] 1452 if (Record.size() < 3) 1453 return Error("Invalid MALLOC record"); 1454 const PointerType *Ty = 1455 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1456 Value *Size = getFnValueByID(Record[1], Type::Int32Ty); 1457 unsigned Align = Record[2]; 1458 if (!Ty || !Size) return Error("Invalid MALLOC record"); 1459 I = new MallocInst(Ty->getElementType(), Size, (1 << Align) >> 1); 1460 break; 1461 } 1462 case bitc::FUNC_CODE_INST_FREE: { // FREE: [op, opty] 1463 unsigned OpNum = 0; 1464 Value *Op; 1465 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1466 OpNum != Record.size()) 1467 return Error("Invalid FREE record"); 1468 I = new FreeInst(Op); 1469 break; 1470 } 1471 case bitc::FUNC_CODE_INST_ALLOCA: { // ALLOCA: [instty, op, align] 1472 if (Record.size() < 3) 1473 return Error("Invalid ALLOCA record"); 1474 const PointerType *Ty = 1475 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1476 Value *Size = getFnValueByID(Record[1], Type::Int32Ty); 1477 unsigned Align = Record[2]; 1478 if (!Ty || !Size) return Error("Invalid ALLOCA record"); 1479 I = new AllocaInst(Ty->getElementType(), Size, (1 << Align) >> 1); 1480 break; 1481 } 1482 case bitc::FUNC_CODE_INST_LOAD: { // LOAD: [opty, op, align, vol] 1483 unsigned OpNum = 0; 1484 Value *Op; 1485 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1486 OpNum+2 != Record.size()) 1487 return Error("Invalid LOAD record"); 1488 1489 I = new LoadInst(Op, "", Record[OpNum+1], (1 << Record[OpNum]) >> 1); 1490 break; 1491 } 1492 case bitc::FUNC_CODE_INST_STORE: { // STORE:[val, valty, ptr, align, vol] 1493 unsigned OpNum = 0; 1494 Value *Val, *Ptr; 1495 if (getValueTypePair(Record, OpNum, NextValueNo, Val) || 1496 getValue(Record, OpNum, PointerType::get(Val->getType()), Ptr) || 1497 OpNum+2 != Record.size()) 1498 return Error("Invalid STORE record"); 1499 1500 I = new StoreInst(Val, Ptr, Record[OpNum+1], (1 << Record[OpNum]) >> 1); 1501 break; 1502 } 1503 case bitc::FUNC_CODE_INST_CALL: { // CALL: [cc, fnty, fnid, arg0, arg1...] 1504 if (Record.size() < 2) 1505 return Error("Invalid CALL record"); 1506 1507 unsigned CCInfo = Record[1]; 1508 1509 unsigned OpNum = 2; 1510 Value *Callee; 1511 if (getValueTypePair(Record, OpNum, NextValueNo, Callee)) 1512 return Error("Invalid CALL record"); 1513 1514 const PointerType *OpTy = dyn_cast<PointerType>(Callee->getType()); 1515 const FunctionType *FTy = 0; 1516 if (OpTy) FTy = dyn_cast<FunctionType>(OpTy->getElementType()); 1517 if (!FTy || Record.size() < FTy->getNumParams()+OpNum) 1518 return Error("Invalid CALL record"); 1519 1520 assert(FTy->getParamAttrs() == getParamAttrs(Record[0])); 1521 1522 SmallVector<Value*, 16> Args; 1523 // Read the fixed params. 1524 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) { 1525 Args.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i))); 1526 if (Args.back() == 0) return Error("Invalid CALL record"); 1527 } 1528 1529 // Read type/value pairs for varargs params. 1530 if (!FTy->isVarArg()) { 1531 if (OpNum != Record.size()) 1532 return Error("Invalid CALL record"); 1533 } else { 1534 while (OpNum != Record.size()) { 1535 Value *Op; 1536 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 1537 return Error("Invalid CALL record"); 1538 Args.push_back(Op); 1539 } 1540 } 1541 1542 I = new CallInst(Callee, &Args[0], Args.size()); 1543 cast<CallInst>(I)->setCallingConv(CCInfo>>1); 1544 cast<CallInst>(I)->setTailCall(CCInfo & 1); 1545 break; 1546 } 1547 case bitc::FUNC_CODE_INST_VAARG: { // VAARG: [valistty, valist, instty] 1548 if (Record.size() < 3) 1549 return Error("Invalid VAARG record"); 1550 const Type *OpTy = getTypeByID(Record[0]); 1551 Value *Op = getFnValueByID(Record[1], OpTy); 1552 const Type *ResTy = getTypeByID(Record[2]); 1553 if (!OpTy || !Op || !ResTy) 1554 return Error("Invalid VAARG record"); 1555 I = new VAArgInst(Op, ResTy); 1556 break; 1557 } 1558 } 1559 1560 // Add instruction to end of current BB. If there is no current BB, reject 1561 // this file. 1562 if (CurBB == 0) { 1563 delete I; 1564 return Error("Invalid instruction with no BB"); 1565 } 1566 CurBB->getInstList().push_back(I); 1567 1568 // If this was a terminator instruction, move to the next block. 1569 if (isa<TerminatorInst>(I)) { 1570 ++CurBBNo; 1571 CurBB = CurBBNo < FunctionBBs.size() ? FunctionBBs[CurBBNo] : 0; 1572 } 1573 1574 // Non-void values get registered in the value table for future use. 1575 if (I && I->getType() != Type::VoidTy) 1576 ValueList.AssignValue(I, NextValueNo++); 1577 } 1578 1579 // Check the function list for unresolved values. 1580 if (Argument *A = dyn_cast<Argument>(ValueList.back())) { 1581 if (A->getParent() == 0) { 1582 // We found at least one unresolved value. Nuke them all to avoid leaks. 1583 for (unsigned i = ModuleValueListSize, e = ValueList.size(); i != e; ++i){ 1584 if ((A = dyn_cast<Argument>(ValueList.back())) && A->getParent() == 0) { 1585 A->replaceAllUsesWith(UndefValue::get(A->getType())); 1586 delete A; 1587 } 1588 } 1589 return Error("Never resolved value found in function!"); 1590 } 1591 } 1592 1593 // Trim the value list down to the size it was before we parsed this function. 1594 ValueList.shrinkTo(ModuleValueListSize); 1595 std::vector<BasicBlock*>().swap(FunctionBBs); 1596 1597 return false; 1598} 1599 1600 1601//===----------------------------------------------------------------------===// 1602// External interface 1603//===----------------------------------------------------------------------===// 1604 1605/// getBitcodeModuleProvider - lazy function-at-a-time loading from a file. 1606/// 1607ModuleProvider *llvm::getBitcodeModuleProvider(MemoryBuffer *Buffer, 1608 std::string *ErrMsg) { 1609 BitcodeReader *R = new BitcodeReader(Buffer); 1610 if (R->ParseBitcode()) { 1611 if (ErrMsg) 1612 *ErrMsg = R->getErrorString(); 1613 1614 // Don't let the BitcodeReader dtor delete 'Buffer'. 1615 R->releaseMemoryBuffer(); 1616 delete R; 1617 return 0; 1618 } 1619 return R; 1620} 1621 1622/// ParseBitcodeFile - Read the specified bitcode file, returning the module. 1623/// If an error occurs, return null and fill in *ErrMsg if non-null. 1624Module *llvm::ParseBitcodeFile(MemoryBuffer *Buffer, std::string *ErrMsg){ 1625 BitcodeReader *R; 1626 R = static_cast<BitcodeReader*>(getBitcodeModuleProvider(Buffer, ErrMsg)); 1627 if (!R) return 0; 1628 1629 // Read the whole module, get a pointer to it, tell ModuleProvider not to 1630 // delete it when its dtor is run. 1631 Module *M = R->releaseModule(ErrMsg); 1632 1633 // Don't let the BitcodeReader dtor delete 'Buffer'. 1634 R->releaseMemoryBuffer(); 1635 delete R; 1636 return M; 1637} 1638