BitcodeReader.cpp revision b348bb81253a1105d23ab1a1771f8d2a6546aa1b
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 27void BitcodeReader::FreeState() { 28 delete Buffer; 29 Buffer = 0; 30 std::vector<PATypeHolder>().swap(TypeList); 31 ValueList.clear(); 32 std::vector<const ParamAttrsList*>().swap(ParamAttrs); 33 std::vector<BasicBlock*>().swap(FunctionBBs); 34 std::vector<Function*>().swap(FunctionsWithBodies); 35 DeferredFunctionInfo.clear(); 36} 37 38//===----------------------------------------------------------------------===// 39// Helper functions to implement forward reference resolution, etc. 40//===----------------------------------------------------------------------===// 41 42/// ConvertToString - Convert a string from a record into an std::string, return 43/// true on failure. 44template<typename StrTy> 45static bool ConvertToString(SmallVector<uint64_t, 64> &Record, unsigned Idx, 46 StrTy &Result) { 47 if (Idx > Record.size()) 48 return true; 49 50 for (unsigned i = Idx, e = Record.size(); i != e; ++i) 51 Result += (char)Record[i]; 52 return false; 53} 54 55static GlobalValue::LinkageTypes GetDecodedLinkage(unsigned Val) { 56 switch (Val) { 57 default: // Map unknown/new linkages to external 58 case 0: return GlobalValue::ExternalLinkage; 59 case 1: return GlobalValue::WeakLinkage; 60 case 2: return GlobalValue::AppendingLinkage; 61 case 3: return GlobalValue::InternalLinkage; 62 case 4: return GlobalValue::LinkOnceLinkage; 63 case 5: return GlobalValue::DLLImportLinkage; 64 case 6: return GlobalValue::DLLExportLinkage; 65 case 7: return GlobalValue::ExternalWeakLinkage; 66 } 67} 68 69static GlobalValue::VisibilityTypes GetDecodedVisibility(unsigned Val) { 70 switch (Val) { 71 default: // Map unknown visibilities to default. 72 case 0: return GlobalValue::DefaultVisibility; 73 case 1: return GlobalValue::HiddenVisibility; 74 case 2: return GlobalValue::ProtectedVisibility; 75 } 76} 77 78static int GetDecodedCastOpcode(unsigned Val) { 79 switch (Val) { 80 default: return -1; 81 case bitc::CAST_TRUNC : return Instruction::Trunc; 82 case bitc::CAST_ZEXT : return Instruction::ZExt; 83 case bitc::CAST_SEXT : return Instruction::SExt; 84 case bitc::CAST_FPTOUI : return Instruction::FPToUI; 85 case bitc::CAST_FPTOSI : return Instruction::FPToSI; 86 case bitc::CAST_UITOFP : return Instruction::UIToFP; 87 case bitc::CAST_SITOFP : return Instruction::SIToFP; 88 case bitc::CAST_FPTRUNC : return Instruction::FPTrunc; 89 case bitc::CAST_FPEXT : return Instruction::FPExt; 90 case bitc::CAST_PTRTOINT: return Instruction::PtrToInt; 91 case bitc::CAST_INTTOPTR: return Instruction::IntToPtr; 92 case bitc::CAST_BITCAST : return Instruction::BitCast; 93 } 94} 95static int GetDecodedBinaryOpcode(unsigned Val, const Type *Ty) { 96 switch (Val) { 97 default: return -1; 98 case bitc::BINOP_ADD: return Instruction::Add; 99 case bitc::BINOP_SUB: return Instruction::Sub; 100 case bitc::BINOP_MUL: return Instruction::Mul; 101 case bitc::BINOP_UDIV: return Instruction::UDiv; 102 case bitc::BINOP_SDIV: 103 return Ty->isFPOrFPVector() ? Instruction::FDiv : Instruction::SDiv; 104 case bitc::BINOP_UREM: return Instruction::URem; 105 case bitc::BINOP_SREM: 106 return Ty->isFPOrFPVector() ? Instruction::FRem : Instruction::SRem; 107 case bitc::BINOP_SHL: return Instruction::Shl; 108 case bitc::BINOP_LSHR: return Instruction::LShr; 109 case bitc::BINOP_ASHR: return Instruction::AShr; 110 case bitc::BINOP_AND: return Instruction::And; 111 case bitc::BINOP_OR: return Instruction::Or; 112 case bitc::BINOP_XOR: return Instruction::Xor; 113 } 114} 115 116 117namespace { 118 /// @brief A class for maintaining the slot number definition 119 /// as a placeholder for the actual definition for forward constants defs. 120 class ConstantPlaceHolder : public ConstantExpr { 121 ConstantPlaceHolder(); // DO NOT IMPLEMENT 122 void operator=(const ConstantPlaceHolder &); // DO NOT IMPLEMENT 123 public: 124 Use Op; 125 ConstantPlaceHolder(const Type *Ty) 126 : ConstantExpr(Ty, Instruction::UserOp1, &Op, 1), 127 Op(UndefValue::get(Type::Int32Ty), this) { 128 } 129 }; 130} 131 132Constant *BitcodeReaderValueList::getConstantFwdRef(unsigned Idx, 133 const Type *Ty) { 134 if (Idx >= size()) { 135 // Insert a bunch of null values. 136 Uses.resize(Idx+1); 137 OperandList = &Uses[0]; 138 NumOperands = Idx+1; 139 } 140 141 if (Value *V = Uses[Idx]) { 142 assert(Ty == V->getType() && "Type mismatch in constant table!"); 143 return cast<Constant>(V); 144 } 145 146 // Create and return a placeholder, which will later be RAUW'd. 147 Constant *C = new ConstantPlaceHolder(Ty); 148 Uses[Idx].init(C, this); 149 return C; 150} 151 152Value *BitcodeReaderValueList::getValueFwdRef(unsigned Idx, const Type *Ty) { 153 if (Idx >= size()) { 154 // Insert a bunch of null values. 155 Uses.resize(Idx+1); 156 OperandList = &Uses[0]; 157 NumOperands = Idx+1; 158 } 159 160 if (Value *V = Uses[Idx]) { 161 assert((Ty == 0 || Ty == V->getType()) && "Type mismatch in value table!"); 162 return V; 163 } 164 165 // No type specified, must be invalid reference. 166 if (Ty == 0) return 0; 167 168 // Create and return a placeholder, which will later be RAUW'd. 169 Value *V = new Argument(Ty); 170 Uses[Idx].init(V, this); 171 return V; 172} 173 174 175const Type *BitcodeReader::getTypeByID(unsigned ID, bool isTypeTable) { 176 // If the TypeID is in range, return it. 177 if (ID < TypeList.size()) 178 return TypeList[ID].get(); 179 if (!isTypeTable) return 0; 180 181 // The type table allows forward references. Push as many Opaque types as 182 // needed to get up to ID. 183 while (TypeList.size() <= ID) 184 TypeList.push_back(OpaqueType::get()); 185 return TypeList.back().get(); 186} 187 188//===----------------------------------------------------------------------===// 189// Functions for parsing blocks from the bitcode file 190//===----------------------------------------------------------------------===// 191 192bool BitcodeReader::ParseParamAttrBlock() { 193 if (Stream.EnterSubBlock(bitc::PARAMATTR_BLOCK_ID)) 194 return Error("Malformed block record"); 195 196 if (!ParamAttrs.empty()) 197 return Error("Multiple PARAMATTR blocks found!"); 198 199 SmallVector<uint64_t, 64> Record; 200 201 ParamAttrsVector Attrs; 202 203 // Read all the records. 204 while (1) { 205 unsigned Code = Stream.ReadCode(); 206 if (Code == bitc::END_BLOCK) { 207 if (Stream.ReadBlockEnd()) 208 return Error("Error at end of PARAMATTR block"); 209 return false; 210 } 211 212 if (Code == bitc::ENTER_SUBBLOCK) { 213 // No known subblocks, always skip them. 214 Stream.ReadSubBlockID(); 215 if (Stream.SkipBlock()) 216 return Error("Malformed block record"); 217 continue; 218 } 219 220 if (Code == bitc::DEFINE_ABBREV) { 221 Stream.ReadAbbrevRecord(); 222 continue; 223 } 224 225 // Read a record. 226 Record.clear(); 227 switch (Stream.ReadRecord(Code, Record)) { 228 default: // Default behavior: ignore. 229 break; 230 case bitc::PARAMATTR_CODE_ENTRY: { // ENTRY: [paramidx0, attr0, ...] 231 if (Record.size() & 1) 232 return Error("Invalid ENTRY record"); 233 234 ParamAttrsWithIndex PAWI; 235 for (unsigned i = 0, e = Record.size(); i != e; i += 2) { 236 PAWI.index = Record[i]; 237 PAWI.attrs = Record[i+1]; 238 Attrs.push_back(PAWI); 239 } 240 ParamAttrs.push_back(ParamAttrsList::get(Attrs)); 241 Attrs.clear(); 242 break; 243 } 244 } 245 } 246} 247 248 249bool BitcodeReader::ParseTypeTable() { 250 if (Stream.EnterSubBlock(bitc::TYPE_BLOCK_ID)) 251 return Error("Malformed block record"); 252 253 if (!TypeList.empty()) 254 return Error("Multiple TYPE_BLOCKs found!"); 255 256 SmallVector<uint64_t, 64> Record; 257 unsigned NumRecords = 0; 258 259 // Read all the records for this type table. 260 while (1) { 261 unsigned Code = Stream.ReadCode(); 262 if (Code == bitc::END_BLOCK) { 263 if (NumRecords != TypeList.size()) 264 return Error("Invalid type forward reference in TYPE_BLOCK"); 265 if (Stream.ReadBlockEnd()) 266 return Error("Error at end of type table block"); 267 return false; 268 } 269 270 if (Code == bitc::ENTER_SUBBLOCK) { 271 // No known subblocks, always skip them. 272 Stream.ReadSubBlockID(); 273 if (Stream.SkipBlock()) 274 return Error("Malformed block record"); 275 continue; 276 } 277 278 if (Code == bitc::DEFINE_ABBREV) { 279 Stream.ReadAbbrevRecord(); 280 continue; 281 } 282 283 // Read a record. 284 Record.clear(); 285 const Type *ResultTy = 0; 286 switch (Stream.ReadRecord(Code, Record)) { 287 default: // Default behavior: unknown type. 288 ResultTy = 0; 289 break; 290 case bitc::TYPE_CODE_NUMENTRY: // TYPE_CODE_NUMENTRY: [numentries] 291 // TYPE_CODE_NUMENTRY contains a count of the number of types in the 292 // type list. This allows us to reserve space. 293 if (Record.size() < 1) 294 return Error("Invalid TYPE_CODE_NUMENTRY record"); 295 TypeList.reserve(Record[0]); 296 continue; 297 case bitc::TYPE_CODE_VOID: // VOID 298 ResultTy = Type::VoidTy; 299 break; 300 case bitc::TYPE_CODE_FLOAT: // FLOAT 301 ResultTy = Type::FloatTy; 302 break; 303 case bitc::TYPE_CODE_DOUBLE: // DOUBLE 304 ResultTy = Type::DoubleTy; 305 break; 306 case bitc::TYPE_CODE_LABEL: // LABEL 307 ResultTy = Type::LabelTy; 308 break; 309 case bitc::TYPE_CODE_OPAQUE: // OPAQUE 310 ResultTy = 0; 311 break; 312 case bitc::TYPE_CODE_INTEGER: // INTEGER: [width] 313 if (Record.size() < 1) 314 return Error("Invalid Integer type record"); 315 316 ResultTy = IntegerType::get(Record[0]); 317 break; 318 case bitc::TYPE_CODE_POINTER: // POINTER: [pointee type] 319 if (Record.size() < 1) 320 return Error("Invalid POINTER type record"); 321 ResultTy = PointerType::get(getTypeByID(Record[0], true)); 322 break; 323 case bitc::TYPE_CODE_FUNCTION: { 324 // FUNCTION: [vararg, attrid, retty, paramty x N] 325 if (Record.size() < 3) 326 return Error("Invalid FUNCTION type record"); 327 std::vector<const Type*> ArgTys; 328 for (unsigned i = 3, e = Record.size(); i != e; ++i) 329 ArgTys.push_back(getTypeByID(Record[i], true)); 330 331 ResultTy = FunctionType::get(getTypeByID(Record[2], true), ArgTys, 332 Record[0], getParamAttrs(Record[1])); 333 break; 334 } 335 case bitc::TYPE_CODE_STRUCT: { // STRUCT: [ispacked, eltty x N] 336 if (Record.size() < 1) 337 return Error("Invalid STRUCT type record"); 338 std::vector<const Type*> EltTys; 339 for (unsigned i = 1, e = Record.size(); i != e; ++i) 340 EltTys.push_back(getTypeByID(Record[i], true)); 341 ResultTy = StructType::get(EltTys, Record[0]); 342 break; 343 } 344 case bitc::TYPE_CODE_ARRAY: // ARRAY: [numelts, eltty] 345 if (Record.size() < 2) 346 return Error("Invalid ARRAY type record"); 347 ResultTy = ArrayType::get(getTypeByID(Record[1], true), Record[0]); 348 break; 349 case bitc::TYPE_CODE_VECTOR: // VECTOR: [numelts, eltty] 350 if (Record.size() < 2) 351 return Error("Invalid VECTOR type record"); 352 ResultTy = VectorType::get(getTypeByID(Record[1], true), Record[0]); 353 break; 354 } 355 356 if (NumRecords == TypeList.size()) { 357 // If this is a new type slot, just append it. 358 TypeList.push_back(ResultTy ? ResultTy : OpaqueType::get()); 359 ++NumRecords; 360 } else if (ResultTy == 0) { 361 // Otherwise, this was forward referenced, so an opaque type was created, 362 // but the result type is actually just an opaque. Leave the one we 363 // created previously. 364 ++NumRecords; 365 } else { 366 // Otherwise, this was forward referenced, so an opaque type was created. 367 // Resolve the opaque type to the real type now. 368 assert(NumRecords < TypeList.size() && "Typelist imbalance"); 369 const OpaqueType *OldTy = cast<OpaqueType>(TypeList[NumRecords++].get()); 370 371 // Don't directly push the new type on the Tab. Instead we want to replace 372 // the opaque type we previously inserted with the new concrete value. The 373 // refinement from the abstract (opaque) type to the new type causes all 374 // uses of the abstract type to use the concrete type (NewTy). This will 375 // also cause the opaque type to be deleted. 376 const_cast<OpaqueType*>(OldTy)->refineAbstractTypeTo(ResultTy); 377 378 // This should have replaced the old opaque type with the new type in the 379 // value table... or with a preexisting type that was already in the 380 // system. Let's just make sure it did. 381 assert(TypeList[NumRecords-1].get() != OldTy && 382 "refineAbstractType didn't work!"); 383 } 384 } 385} 386 387 388bool BitcodeReader::ParseTypeSymbolTable() { 389 if (Stream.EnterSubBlock(bitc::TYPE_SYMTAB_BLOCK_ID)) 390 return Error("Malformed block record"); 391 392 SmallVector<uint64_t, 64> Record; 393 394 // Read all the records for this type table. 395 std::string TypeName; 396 while (1) { 397 unsigned Code = Stream.ReadCode(); 398 if (Code == bitc::END_BLOCK) { 399 if (Stream.ReadBlockEnd()) 400 return Error("Error at end of type symbol table block"); 401 return false; 402 } 403 404 if (Code == bitc::ENTER_SUBBLOCK) { 405 // No known subblocks, always skip them. 406 Stream.ReadSubBlockID(); 407 if (Stream.SkipBlock()) 408 return Error("Malformed block record"); 409 continue; 410 } 411 412 if (Code == bitc::DEFINE_ABBREV) { 413 Stream.ReadAbbrevRecord(); 414 continue; 415 } 416 417 // Read a record. 418 Record.clear(); 419 switch (Stream.ReadRecord(Code, Record)) { 420 default: // Default behavior: unknown type. 421 break; 422 case bitc::TST_CODE_ENTRY: // TST_ENTRY: [typeid, namechar x N] 423 if (ConvertToString(Record, 1, TypeName)) 424 return Error("Invalid TST_ENTRY record"); 425 unsigned TypeID = Record[0]; 426 if (TypeID >= TypeList.size()) 427 return Error("Invalid Type ID in TST_ENTRY record"); 428 429 TheModule->addTypeName(TypeName, TypeList[TypeID].get()); 430 TypeName.clear(); 431 break; 432 } 433 } 434} 435 436bool BitcodeReader::ParseValueSymbolTable() { 437 if (Stream.EnterSubBlock(bitc::VALUE_SYMTAB_BLOCK_ID)) 438 return Error("Malformed block record"); 439 440 SmallVector<uint64_t, 64> Record; 441 442 // Read all the records for this value table. 443 SmallString<128> ValueName; 444 while (1) { 445 unsigned Code = Stream.ReadCode(); 446 if (Code == bitc::END_BLOCK) { 447 if (Stream.ReadBlockEnd()) 448 return Error("Error at end of value symbol table block"); 449 return false; 450 } 451 if (Code == bitc::ENTER_SUBBLOCK) { 452 // No known subblocks, always skip them. 453 Stream.ReadSubBlockID(); 454 if (Stream.SkipBlock()) 455 return Error("Malformed block record"); 456 continue; 457 } 458 459 if (Code == bitc::DEFINE_ABBREV) { 460 Stream.ReadAbbrevRecord(); 461 continue; 462 } 463 464 // Read a record. 465 Record.clear(); 466 switch (Stream.ReadRecord(Code, Record)) { 467 default: // Default behavior: unknown type. 468 break; 469 case bitc::VST_CODE_ENTRY: { // VST_ENTRY: [valueid, namechar x N] 470 if (ConvertToString(Record, 1, ValueName)) 471 return Error("Invalid TST_ENTRY record"); 472 unsigned ValueID = Record[0]; 473 if (ValueID >= ValueList.size()) 474 return Error("Invalid Value ID in VST_ENTRY record"); 475 Value *V = ValueList[ValueID]; 476 477 V->setName(&ValueName[0], ValueName.size()); 478 ValueName.clear(); 479 break; 480 } 481 case bitc::VST_CODE_BBENTRY: { 482 if (ConvertToString(Record, 1, ValueName)) 483 return Error("Invalid VST_BBENTRY record"); 484 BasicBlock *BB = getBasicBlock(Record[0]); 485 if (BB == 0) 486 return Error("Invalid BB ID in VST_BBENTRY record"); 487 488 BB->setName(&ValueName[0], ValueName.size()); 489 ValueName.clear(); 490 break; 491 } 492 } 493 } 494} 495 496/// DecodeSignRotatedValue - Decode a signed value stored with the sign bit in 497/// the LSB for dense VBR encoding. 498static uint64_t DecodeSignRotatedValue(uint64_t V) { 499 if ((V & 1) == 0) 500 return V >> 1; 501 if (V != 1) 502 return -(V >> 1); 503 // There is no such thing as -0 with integers. "-0" really means MININT. 504 return 1ULL << 63; 505} 506 507/// ResolveGlobalAndAliasInits - Resolve all of the initializers for global 508/// values and aliases that we can. 509bool BitcodeReader::ResolveGlobalAndAliasInits() { 510 std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInitWorklist; 511 std::vector<std::pair<GlobalAlias*, unsigned> > AliasInitWorklist; 512 513 GlobalInitWorklist.swap(GlobalInits); 514 AliasInitWorklist.swap(AliasInits); 515 516 while (!GlobalInitWorklist.empty()) { 517 unsigned ValID = GlobalInitWorklist.back().second; 518 if (ValID >= ValueList.size()) { 519 // Not ready to resolve this yet, it requires something later in the file. 520 GlobalInits.push_back(GlobalInitWorklist.back()); 521 } else { 522 if (Constant *C = dyn_cast<Constant>(ValueList[ValID])) 523 GlobalInitWorklist.back().first->setInitializer(C); 524 else 525 return Error("Global variable initializer is not a constant!"); 526 } 527 GlobalInitWorklist.pop_back(); 528 } 529 530 while (!AliasInitWorklist.empty()) { 531 unsigned ValID = AliasInitWorklist.back().second; 532 if (ValID >= ValueList.size()) { 533 AliasInits.push_back(AliasInitWorklist.back()); 534 } else { 535 if (Constant *C = dyn_cast<Constant>(ValueList[ValID])) 536 AliasInitWorklist.back().first->setAliasee(C); 537 else 538 return Error("Alias initializer is not a constant!"); 539 } 540 AliasInitWorklist.pop_back(); 541 } 542 return false; 543} 544 545 546bool BitcodeReader::ParseConstants() { 547 if (Stream.EnterSubBlock(bitc::CONSTANTS_BLOCK_ID)) 548 return Error("Malformed block record"); 549 550 SmallVector<uint64_t, 64> Record; 551 552 // Read all the records for this value table. 553 const Type *CurTy = Type::Int32Ty; 554 unsigned NextCstNo = ValueList.size(); 555 while (1) { 556 unsigned Code = Stream.ReadCode(); 557 if (Code == bitc::END_BLOCK) { 558 if (NextCstNo != ValueList.size()) 559 return Error("Invalid constant reference!"); 560 561 if (Stream.ReadBlockEnd()) 562 return Error("Error at end of constants block"); 563 return false; 564 } 565 566 if (Code == bitc::ENTER_SUBBLOCK) { 567 // No known subblocks, always skip them. 568 Stream.ReadSubBlockID(); 569 if (Stream.SkipBlock()) 570 return Error("Malformed block record"); 571 continue; 572 } 573 574 if (Code == bitc::DEFINE_ABBREV) { 575 Stream.ReadAbbrevRecord(); 576 continue; 577 } 578 579 // Read a record. 580 Record.clear(); 581 Value *V = 0; 582 switch (Stream.ReadRecord(Code, Record)) { 583 default: // Default behavior: unknown constant 584 case bitc::CST_CODE_UNDEF: // UNDEF 585 V = UndefValue::get(CurTy); 586 break; 587 case bitc::CST_CODE_SETTYPE: // SETTYPE: [typeid] 588 if (Record.empty()) 589 return Error("Malformed CST_SETTYPE record"); 590 if (Record[0] >= TypeList.size()) 591 return Error("Invalid Type ID in CST_SETTYPE record"); 592 CurTy = TypeList[Record[0]]; 593 continue; // Skip the ValueList manipulation. 594 case bitc::CST_CODE_NULL: // NULL 595 V = Constant::getNullValue(CurTy); 596 break; 597 case bitc::CST_CODE_INTEGER: // INTEGER: [intval] 598 if (!isa<IntegerType>(CurTy) || Record.empty()) 599 return Error("Invalid CST_INTEGER record"); 600 V = ConstantInt::get(CurTy, DecodeSignRotatedValue(Record[0])); 601 break; 602 case bitc::CST_CODE_WIDE_INTEGER: {// WIDE_INTEGER: [n x intval] 603 if (!isa<IntegerType>(CurTy) || Record.empty()) 604 return Error("Invalid WIDE_INTEGER record"); 605 606 unsigned NumWords = Record.size(); 607 SmallVector<uint64_t, 8> Words; 608 Words.resize(NumWords); 609 for (unsigned i = 0; i != NumWords; ++i) 610 Words[i] = DecodeSignRotatedValue(Record[i]); 611 V = ConstantInt::get(APInt(cast<IntegerType>(CurTy)->getBitWidth(), 612 NumWords, &Words[0])); 613 break; 614 } 615 case bitc::CST_CODE_FLOAT: // FLOAT: [fpval] 616 if (Record.empty()) 617 return Error("Invalid FLOAT record"); 618 if (CurTy == Type::FloatTy) 619 V = ConstantFP::get(CurTy, BitsToFloat(Record[0])); 620 else if (CurTy == Type::DoubleTy) 621 V = ConstantFP::get(CurTy, BitsToDouble(Record[0])); 622 else 623 V = UndefValue::get(CurTy); 624 break; 625 626 case bitc::CST_CODE_AGGREGATE: {// AGGREGATE: [n x value number] 627 if (Record.empty()) 628 return Error("Invalid CST_AGGREGATE record"); 629 630 unsigned Size = Record.size(); 631 std::vector<Constant*> Elts; 632 633 if (const StructType *STy = dyn_cast<StructType>(CurTy)) { 634 for (unsigned i = 0; i != Size; ++i) 635 Elts.push_back(ValueList.getConstantFwdRef(Record[i], 636 STy->getElementType(i))); 637 V = ConstantStruct::get(STy, Elts); 638 } else if (const ArrayType *ATy = dyn_cast<ArrayType>(CurTy)) { 639 const Type *EltTy = ATy->getElementType(); 640 for (unsigned i = 0; i != Size; ++i) 641 Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy)); 642 V = ConstantArray::get(ATy, Elts); 643 } else if (const VectorType *VTy = dyn_cast<VectorType>(CurTy)) { 644 const Type *EltTy = VTy->getElementType(); 645 for (unsigned i = 0; i != Size; ++i) 646 Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy)); 647 V = ConstantVector::get(Elts); 648 } else { 649 V = UndefValue::get(CurTy); 650 } 651 break; 652 } 653 case bitc::CST_CODE_STRING: { // STRING: [values] 654 if (Record.empty()) 655 return Error("Invalid CST_AGGREGATE record"); 656 657 const ArrayType *ATy = cast<ArrayType>(CurTy); 658 const Type *EltTy = ATy->getElementType(); 659 660 unsigned Size = Record.size(); 661 std::vector<Constant*> Elts; 662 for (unsigned i = 0; i != Size; ++i) 663 Elts.push_back(ConstantInt::get(EltTy, Record[i])); 664 V = ConstantArray::get(ATy, Elts); 665 break; 666 } 667 case bitc::CST_CODE_CSTRING: { // CSTRING: [values] 668 if (Record.empty()) 669 return Error("Invalid CST_AGGREGATE record"); 670 671 const ArrayType *ATy = cast<ArrayType>(CurTy); 672 const Type *EltTy = ATy->getElementType(); 673 674 unsigned Size = Record.size(); 675 std::vector<Constant*> Elts; 676 for (unsigned i = 0; i != Size; ++i) 677 Elts.push_back(ConstantInt::get(EltTy, Record[i])); 678 Elts.push_back(Constant::getNullValue(EltTy)); 679 V = ConstantArray::get(ATy, Elts); 680 break; 681 } 682 case bitc::CST_CODE_CE_BINOP: { // CE_BINOP: [opcode, opval, opval] 683 if (Record.size() < 3) return Error("Invalid CE_BINOP record"); 684 int Opc = GetDecodedBinaryOpcode(Record[0], CurTy); 685 if (Opc < 0) { 686 V = UndefValue::get(CurTy); // Unknown binop. 687 } else { 688 Constant *LHS = ValueList.getConstantFwdRef(Record[1], CurTy); 689 Constant *RHS = ValueList.getConstantFwdRef(Record[2], CurTy); 690 V = ConstantExpr::get(Opc, LHS, RHS); 691 } 692 break; 693 } 694 case bitc::CST_CODE_CE_CAST: { // CE_CAST: [opcode, opty, opval] 695 if (Record.size() < 3) return Error("Invalid CE_CAST record"); 696 int Opc = GetDecodedCastOpcode(Record[0]); 697 if (Opc < 0) { 698 V = UndefValue::get(CurTy); // Unknown cast. 699 } else { 700 const Type *OpTy = getTypeByID(Record[1]); 701 if (!OpTy) return Error("Invalid CE_CAST record"); 702 Constant *Op = ValueList.getConstantFwdRef(Record[2], OpTy); 703 V = ConstantExpr::getCast(Opc, Op, CurTy); 704 } 705 break; 706 } 707 case bitc::CST_CODE_CE_GEP: { // CE_GEP: [n x operands] 708 if (Record.size() & 1) return Error("Invalid CE_GEP record"); 709 SmallVector<Constant*, 16> Elts; 710 for (unsigned i = 0, e = Record.size(); i != e; i += 2) { 711 const Type *ElTy = getTypeByID(Record[i]); 712 if (!ElTy) return Error("Invalid CE_GEP record"); 713 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], ElTy)); 714 } 715 V = ConstantExpr::getGetElementPtr(Elts[0], &Elts[1], Elts.size()-1); 716 break; 717 } 718 case bitc::CST_CODE_CE_SELECT: // CE_SELECT: [opval#, opval#, opval#] 719 if (Record.size() < 3) return Error("Invalid CE_SELECT record"); 720 V = ConstantExpr::getSelect(ValueList.getConstantFwdRef(Record[0], 721 Type::Int1Ty), 722 ValueList.getConstantFwdRef(Record[1],CurTy), 723 ValueList.getConstantFwdRef(Record[2],CurTy)); 724 break; 725 case bitc::CST_CODE_CE_EXTRACTELT: { // CE_EXTRACTELT: [opty, opval, opval] 726 if (Record.size() < 3) return Error("Invalid CE_EXTRACTELT record"); 727 const VectorType *OpTy = 728 dyn_cast_or_null<VectorType>(getTypeByID(Record[0])); 729 if (OpTy == 0) return Error("Invalid CE_EXTRACTELT record"); 730 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 731 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], 732 OpTy->getElementType()); 733 V = ConstantExpr::getExtractElement(Op0, Op1); 734 break; 735 } 736 case bitc::CST_CODE_CE_INSERTELT: { // CE_INSERTELT: [opval, opval, opval] 737 const VectorType *OpTy = dyn_cast<VectorType>(CurTy); 738 if (Record.size() < 3 || OpTy == 0) 739 return Error("Invalid CE_INSERTELT record"); 740 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); 741 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], 742 OpTy->getElementType()); 743 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], Type::Int32Ty); 744 V = ConstantExpr::getInsertElement(Op0, Op1, Op2); 745 break; 746 } 747 case bitc::CST_CODE_CE_SHUFFLEVEC: { // CE_SHUFFLEVEC: [opval, opval, opval] 748 const VectorType *OpTy = dyn_cast<VectorType>(CurTy); 749 if (Record.size() < 3 || OpTy == 0) 750 return Error("Invalid CE_INSERTELT record"); 751 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); 752 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], OpTy); 753 const Type *ShufTy=VectorType::get(Type::Int32Ty, OpTy->getNumElements()); 754 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], ShufTy); 755 V = ConstantExpr::getShuffleVector(Op0, Op1, Op2); 756 break; 757 } 758 case bitc::CST_CODE_CE_CMP: { // CE_CMP: [opty, opval, opval, pred] 759 if (Record.size() < 4) return Error("Invalid CE_CMP record"); 760 const Type *OpTy = getTypeByID(Record[0]); 761 if (OpTy == 0) return Error("Invalid CE_CMP record"); 762 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 763 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy); 764 765 if (OpTy->isFloatingPoint()) 766 V = ConstantExpr::getFCmp(Record[3], Op0, Op1); 767 else 768 V = ConstantExpr::getICmp(Record[3], Op0, Op1); 769 break; 770 } 771 case bitc::CST_CODE_INLINEASM: { 772 if (Record.size() < 2) return Error("Invalid INLINEASM record"); 773 std::string AsmStr, ConstrStr; 774 bool HasSideEffects = Record[0]; 775 unsigned AsmStrSize = Record[1]; 776 if (2+AsmStrSize >= Record.size()) 777 return Error("Invalid INLINEASM record"); 778 unsigned ConstStrSize = Record[2+AsmStrSize]; 779 if (3+AsmStrSize+ConstStrSize > Record.size()) 780 return Error("Invalid INLINEASM record"); 781 782 for (unsigned i = 0; i != AsmStrSize; ++i) 783 AsmStr += (char)Record[2+i]; 784 for (unsigned i = 0; i != ConstStrSize; ++i) 785 ConstrStr += (char)Record[3+AsmStrSize+i]; 786 const PointerType *PTy = cast<PointerType>(CurTy); 787 V = InlineAsm::get(cast<FunctionType>(PTy->getElementType()), 788 AsmStr, ConstrStr, HasSideEffects); 789 break; 790 } 791 } 792 793 ValueList.AssignValue(V, NextCstNo); 794 ++NextCstNo; 795 } 796} 797 798/// RememberAndSkipFunctionBody - When we see the block for a function body, 799/// remember where it is and then skip it. This lets us lazily deserialize the 800/// functions. 801bool BitcodeReader::RememberAndSkipFunctionBody() { 802 // Get the function we are talking about. 803 if (FunctionsWithBodies.empty()) 804 return Error("Insufficient function protos"); 805 806 Function *Fn = FunctionsWithBodies.back(); 807 FunctionsWithBodies.pop_back(); 808 809 // Save the current stream state. 810 uint64_t CurBit = Stream.GetCurrentBitNo(); 811 DeferredFunctionInfo[Fn] = std::make_pair(CurBit, Fn->getLinkage()); 812 813 // Set the functions linkage to GhostLinkage so we know it is lazily 814 // deserialized. 815 Fn->setLinkage(GlobalValue::GhostLinkage); 816 817 // Skip over the function block for now. 818 if (Stream.SkipBlock()) 819 return Error("Malformed block record"); 820 return false; 821} 822 823bool BitcodeReader::ParseModule(const std::string &ModuleID) { 824 // Reject multiple MODULE_BLOCK's in a single bitstream. 825 if (TheModule) 826 return Error("Multiple MODULE_BLOCKs in same stream"); 827 828 if (Stream.EnterSubBlock(bitc::MODULE_BLOCK_ID)) 829 return Error("Malformed block record"); 830 831 // Otherwise, create the module. 832 TheModule = new Module(ModuleID); 833 834 SmallVector<uint64_t, 64> Record; 835 std::vector<std::string> SectionTable; 836 837 // Read all the records for this module. 838 while (!Stream.AtEndOfStream()) { 839 unsigned Code = Stream.ReadCode(); 840 if (Code == bitc::END_BLOCK) { 841 if (Stream.ReadBlockEnd()) 842 return Error("Error at end of module block"); 843 844 // Patch the initializers for globals and aliases up. 845 ResolveGlobalAndAliasInits(); 846 if (!GlobalInits.empty() || !AliasInits.empty()) 847 return Error("Malformed global initializer set"); 848 if (!FunctionsWithBodies.empty()) 849 return Error("Too few function bodies found"); 850 851 // Force deallocation of memory for these vectors to favor the client that 852 // want lazy deserialization. 853 std::vector<std::pair<GlobalVariable*, unsigned> >().swap(GlobalInits); 854 std::vector<std::pair<GlobalAlias*, unsigned> >().swap(AliasInits); 855 std::vector<Function*>().swap(FunctionsWithBodies); 856 return false; 857 } 858 859 if (Code == bitc::ENTER_SUBBLOCK) { 860 switch (Stream.ReadSubBlockID()) { 861 default: // Skip unknown content. 862 if (Stream.SkipBlock()) 863 return Error("Malformed block record"); 864 break; 865 case bitc::BLOCKINFO_BLOCK_ID: 866 if (Stream.ReadBlockInfoBlock()) 867 return Error("Malformed BlockInfoBlock"); 868 break; 869 case bitc::PARAMATTR_BLOCK_ID: 870 if (ParseParamAttrBlock()) 871 return true; 872 break; 873 case bitc::TYPE_BLOCK_ID: 874 if (ParseTypeTable()) 875 return true; 876 break; 877 case bitc::TYPE_SYMTAB_BLOCK_ID: 878 if (ParseTypeSymbolTable()) 879 return true; 880 break; 881 case bitc::VALUE_SYMTAB_BLOCK_ID: 882 if (ParseValueSymbolTable()) 883 return true; 884 break; 885 case bitc::CONSTANTS_BLOCK_ID: 886 if (ParseConstants() || ResolveGlobalAndAliasInits()) 887 return true; 888 break; 889 case bitc::FUNCTION_BLOCK_ID: 890 // If this is the first function body we've seen, reverse the 891 // FunctionsWithBodies list. 892 if (!HasReversedFunctionsWithBodies) { 893 std::reverse(FunctionsWithBodies.begin(), FunctionsWithBodies.end()); 894 HasReversedFunctionsWithBodies = true; 895 } 896 897 if (RememberAndSkipFunctionBody()) 898 return true; 899 break; 900 } 901 continue; 902 } 903 904 if (Code == bitc::DEFINE_ABBREV) { 905 Stream.ReadAbbrevRecord(); 906 continue; 907 } 908 909 // Read a record. 910 switch (Stream.ReadRecord(Code, Record)) { 911 default: break; // Default behavior, ignore unknown content. 912 case bitc::MODULE_CODE_VERSION: // VERSION: [version#] 913 if (Record.size() < 1) 914 return Error("Malformed MODULE_CODE_VERSION"); 915 // Only version #0 is supported so far. 916 if (Record[0] != 0) 917 return Error("Unknown bitstream version!"); 918 break; 919 case bitc::MODULE_CODE_TRIPLE: { // TRIPLE: [strchr x N] 920 std::string S; 921 if (ConvertToString(Record, 0, S)) 922 return Error("Invalid MODULE_CODE_TRIPLE record"); 923 TheModule->setTargetTriple(S); 924 break; 925 } 926 case bitc::MODULE_CODE_DATALAYOUT: { // DATALAYOUT: [strchr x N] 927 std::string S; 928 if (ConvertToString(Record, 0, S)) 929 return Error("Invalid MODULE_CODE_DATALAYOUT record"); 930 TheModule->setDataLayout(S); 931 break; 932 } 933 case bitc::MODULE_CODE_ASM: { // ASM: [strchr x N] 934 std::string S; 935 if (ConvertToString(Record, 0, S)) 936 return Error("Invalid MODULE_CODE_ASM record"); 937 TheModule->setModuleInlineAsm(S); 938 break; 939 } 940 case bitc::MODULE_CODE_DEPLIB: { // DEPLIB: [strchr x N] 941 std::string S; 942 if (ConvertToString(Record, 0, S)) 943 return Error("Invalid MODULE_CODE_DEPLIB record"); 944 TheModule->addLibrary(S); 945 break; 946 } 947 case bitc::MODULE_CODE_SECTIONNAME: { // SECTIONNAME: [strchr x N] 948 std::string S; 949 if (ConvertToString(Record, 0, S)) 950 return Error("Invalid MODULE_CODE_SECTIONNAME record"); 951 SectionTable.push_back(S); 952 break; 953 } 954 // GLOBALVAR: [type, isconst, initid, 955 // linkage, alignment, section, visibility, threadlocal] 956 case bitc::MODULE_CODE_GLOBALVAR: { 957 if (Record.size() < 6) 958 return Error("Invalid MODULE_CODE_GLOBALVAR record"); 959 const Type *Ty = getTypeByID(Record[0]); 960 if (!isa<PointerType>(Ty)) 961 return Error("Global not a pointer type!"); 962 Ty = cast<PointerType>(Ty)->getElementType(); 963 964 bool isConstant = Record[1]; 965 GlobalValue::LinkageTypes Linkage = GetDecodedLinkage(Record[3]); 966 unsigned Alignment = (1 << Record[4]) >> 1; 967 std::string Section; 968 if (Record[5]) { 969 if (Record[5]-1 >= SectionTable.size()) 970 return Error("Invalid section ID"); 971 Section = SectionTable[Record[5]-1]; 972 } 973 GlobalValue::VisibilityTypes Visibility = GlobalValue::DefaultVisibility; 974 if (Record.size() > 6) 975 Visibility = GetDecodedVisibility(Record[6]); 976 bool isThreadLocal = false; 977 if (Record.size() > 7) 978 isThreadLocal = Record[7]; 979 980 GlobalVariable *NewGV = 981 new GlobalVariable(Ty, isConstant, Linkage, 0, "", TheModule); 982 NewGV->setAlignment(Alignment); 983 if (!Section.empty()) 984 NewGV->setSection(Section); 985 NewGV->setVisibility(Visibility); 986 NewGV->setThreadLocal(isThreadLocal); 987 988 ValueList.push_back(NewGV); 989 990 // Remember which value to use for the global initializer. 991 if (unsigned InitID = Record[2]) 992 GlobalInits.push_back(std::make_pair(NewGV, InitID-1)); 993 break; 994 } 995 // FUNCTION: [type, callingconv, isproto, linkage, paramattr, 996 // alignment, section, visibility] 997 case bitc::MODULE_CODE_FUNCTION: { 998 if (Record.size() < 8) 999 return Error("Invalid MODULE_CODE_FUNCTION record"); 1000 const Type *Ty = getTypeByID(Record[0]); 1001 if (!isa<PointerType>(Ty)) 1002 return Error("Function not a pointer type!"); 1003 const FunctionType *FTy = 1004 dyn_cast<FunctionType>(cast<PointerType>(Ty)->getElementType()); 1005 if (!FTy) 1006 return Error("Function not a pointer to function type!"); 1007 1008 Function *Func = new Function(FTy, GlobalValue::ExternalLinkage, 1009 "", TheModule); 1010 1011 Func->setCallingConv(Record[1]); 1012 bool isProto = Record[2]; 1013 Func->setLinkage(GetDecodedLinkage(Record[3])); 1014 1015 assert(Func->getFunctionType()->getParamAttrs() == 1016 getParamAttrs(Record[4])); 1017 1018 Func->setAlignment((1 << Record[5]) >> 1); 1019 if (Record[6]) { 1020 if (Record[6]-1 >= SectionTable.size()) 1021 return Error("Invalid section ID"); 1022 Func->setSection(SectionTable[Record[6]-1]); 1023 } 1024 Func->setVisibility(GetDecodedVisibility(Record[7])); 1025 1026 ValueList.push_back(Func); 1027 1028 // If this is a function with a body, remember the prototype we are 1029 // creating now, so that we can match up the body with them later. 1030 if (!isProto) 1031 FunctionsWithBodies.push_back(Func); 1032 break; 1033 } 1034 // ALIAS: [alias type, aliasee val#, linkage] 1035 case bitc::MODULE_CODE_ALIAS: { 1036 if (Record.size() < 3) 1037 return Error("Invalid MODULE_ALIAS record"); 1038 const Type *Ty = getTypeByID(Record[0]); 1039 if (!isa<PointerType>(Ty)) 1040 return Error("Function not a pointer type!"); 1041 1042 GlobalAlias *NewGA = new GlobalAlias(Ty, GetDecodedLinkage(Record[2]), 1043 "", 0, TheModule); 1044 ValueList.push_back(NewGA); 1045 AliasInits.push_back(std::make_pair(NewGA, Record[1])); 1046 break; 1047 } 1048 /// MODULE_CODE_PURGEVALS: [numvals] 1049 case bitc::MODULE_CODE_PURGEVALS: 1050 // Trim down the value list to the specified size. 1051 if (Record.size() < 1 || Record[0] > ValueList.size()) 1052 return Error("Invalid MODULE_PURGEVALS record"); 1053 ValueList.shrinkTo(Record[0]); 1054 break; 1055 } 1056 Record.clear(); 1057 } 1058 1059 return Error("Premature end of bitstream"); 1060} 1061 1062 1063bool BitcodeReader::ParseBitcode() { 1064 TheModule = 0; 1065 1066 if (Buffer->getBufferSize() & 3) 1067 return Error("Bitcode stream should be a multiple of 4 bytes in length"); 1068 1069 unsigned char *BufPtr = (unsigned char *)Buffer->getBufferStart(); 1070 Stream.init(BufPtr, BufPtr+Buffer->getBufferSize()); 1071 1072 // Sniff for the signature. 1073 if (Stream.Read(8) != 'B' || 1074 Stream.Read(8) != 'C' || 1075 Stream.Read(4) != 0x0 || 1076 Stream.Read(4) != 0xC || 1077 Stream.Read(4) != 0xE || 1078 Stream.Read(4) != 0xD) 1079 return Error("Invalid bitcode signature"); 1080 1081 // We expect a number of well-defined blocks, though we don't necessarily 1082 // need to understand them all. 1083 while (!Stream.AtEndOfStream()) { 1084 unsigned Code = Stream.ReadCode(); 1085 1086 if (Code != bitc::ENTER_SUBBLOCK) 1087 return Error("Invalid record at top-level"); 1088 1089 unsigned BlockID = Stream.ReadSubBlockID(); 1090 1091 // We only know the MODULE subblock ID. 1092 switch (BlockID) { 1093 case bitc::BLOCKINFO_BLOCK_ID: 1094 if (Stream.ReadBlockInfoBlock()) 1095 return Error("Malformed BlockInfoBlock"); 1096 break; 1097 case bitc::MODULE_BLOCK_ID: 1098 if (ParseModule(Buffer->getBufferIdentifier())) 1099 return true; 1100 break; 1101 default: 1102 if (Stream.SkipBlock()) 1103 return Error("Malformed block record"); 1104 break; 1105 } 1106 } 1107 1108 return false; 1109} 1110 1111 1112/// ParseFunctionBody - Lazily parse the specified function body block. 1113bool BitcodeReader::ParseFunctionBody(Function *F) { 1114 if (Stream.EnterSubBlock(bitc::FUNCTION_BLOCK_ID)) 1115 return Error("Malformed block record"); 1116 1117 unsigned ModuleValueListSize = ValueList.size(); 1118 1119 // Add all the function arguments to the value table. 1120 for(Function::arg_iterator I = F->arg_begin(), E = F->arg_end(); I != E; ++I) 1121 ValueList.push_back(I); 1122 1123 unsigned NextValueNo = ValueList.size(); 1124 BasicBlock *CurBB = 0; 1125 unsigned CurBBNo = 0; 1126 1127 // Read all the records. 1128 SmallVector<uint64_t, 64> Record; 1129 while (1) { 1130 unsigned Code = Stream.ReadCode(); 1131 if (Code == bitc::END_BLOCK) { 1132 if (Stream.ReadBlockEnd()) 1133 return Error("Error at end of function block"); 1134 break; 1135 } 1136 1137 if (Code == bitc::ENTER_SUBBLOCK) { 1138 switch (Stream.ReadSubBlockID()) { 1139 default: // Skip unknown content. 1140 if (Stream.SkipBlock()) 1141 return Error("Malformed block record"); 1142 break; 1143 case bitc::CONSTANTS_BLOCK_ID: 1144 if (ParseConstants()) return true; 1145 NextValueNo = ValueList.size(); 1146 break; 1147 case bitc::VALUE_SYMTAB_BLOCK_ID: 1148 if (ParseValueSymbolTable()) return true; 1149 break; 1150 } 1151 continue; 1152 } 1153 1154 if (Code == bitc::DEFINE_ABBREV) { 1155 Stream.ReadAbbrevRecord(); 1156 continue; 1157 } 1158 1159 // Read a record. 1160 Record.clear(); 1161 Instruction *I = 0; 1162 switch (Stream.ReadRecord(Code, Record)) { 1163 default: // Default behavior: reject 1164 return Error("Unknown instruction"); 1165 case bitc::FUNC_CODE_DECLAREBLOCKS: // DECLAREBLOCKS: [nblocks] 1166 if (Record.size() < 1 || Record[0] == 0) 1167 return Error("Invalid DECLAREBLOCKS record"); 1168 // Create all the basic blocks for the function. 1169 FunctionBBs.resize(Record[0]); 1170 for (unsigned i = 0, e = FunctionBBs.size(); i != e; ++i) 1171 FunctionBBs[i] = new BasicBlock("", F); 1172 CurBB = FunctionBBs[0]; 1173 continue; 1174 1175 case bitc::FUNC_CODE_INST_BINOP: { // BINOP: [opval, ty, opval, opcode] 1176 unsigned OpNum = 0; 1177 Value *LHS, *RHS; 1178 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) || 1179 getValue(Record, OpNum, LHS->getType(), RHS) || 1180 OpNum+1 != Record.size()) 1181 return Error("Invalid BINOP record"); 1182 1183 int Opc = GetDecodedBinaryOpcode(Record[OpNum], LHS->getType()); 1184 if (Opc == -1) return Error("Invalid BINOP record"); 1185 I = BinaryOperator::create((Instruction::BinaryOps)Opc, LHS, RHS); 1186 break; 1187 } 1188 case bitc::FUNC_CODE_INST_CAST: { // CAST: [opval, opty, destty, castopc] 1189 unsigned OpNum = 0; 1190 Value *Op; 1191 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1192 OpNum+2 != Record.size()) 1193 return Error("Invalid CAST record"); 1194 1195 const Type *ResTy = getTypeByID(Record[OpNum]); 1196 int Opc = GetDecodedCastOpcode(Record[OpNum+1]); 1197 if (Opc == -1 || ResTy == 0) 1198 return Error("Invalid CAST record"); 1199 I = CastInst::create((Instruction::CastOps)Opc, Op, ResTy); 1200 break; 1201 } 1202 case bitc::FUNC_CODE_INST_GEP: { // GEP: [n x operands] 1203 unsigned OpNum = 0; 1204 Value *BasePtr; 1205 if (getValueTypePair(Record, OpNum, NextValueNo, BasePtr)) 1206 return Error("Invalid GEP record"); 1207 1208 SmallVector<Value*, 16> GEPIdx; 1209 while (OpNum != Record.size()) { 1210 Value *Op; 1211 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 1212 return Error("Invalid GEP record"); 1213 GEPIdx.push_back(Op); 1214 } 1215 1216 I = new GetElementPtrInst(BasePtr, &GEPIdx[0], GEPIdx.size()); 1217 break; 1218 } 1219 1220 case bitc::FUNC_CODE_INST_SELECT: { // SELECT: [opval, ty, opval, opval] 1221 unsigned OpNum = 0; 1222 Value *TrueVal, *FalseVal, *Cond; 1223 if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) || 1224 getValue(Record, OpNum, TrueVal->getType(), FalseVal) || 1225 getValue(Record, OpNum, Type::Int1Ty, Cond)) 1226 return Error("Invalid SELECT record"); 1227 1228 I = new SelectInst(Cond, TrueVal, FalseVal); 1229 break; 1230 } 1231 1232 case bitc::FUNC_CODE_INST_EXTRACTELT: { // EXTRACTELT: [opty, opval, opval] 1233 unsigned OpNum = 0; 1234 Value *Vec, *Idx; 1235 if (getValueTypePair(Record, OpNum, NextValueNo, Vec) || 1236 getValue(Record, OpNum, Type::Int32Ty, Idx)) 1237 return Error("Invalid EXTRACTELT record"); 1238 I = new ExtractElementInst(Vec, Idx); 1239 break; 1240 } 1241 1242 case bitc::FUNC_CODE_INST_INSERTELT: { // INSERTELT: [ty, opval,opval,opval] 1243 unsigned OpNum = 0; 1244 Value *Vec, *Elt, *Idx; 1245 if (getValueTypePair(Record, OpNum, NextValueNo, Vec) || 1246 getValue(Record, OpNum, 1247 cast<VectorType>(Vec->getType())->getElementType(), Elt) || 1248 getValue(Record, OpNum, Type::Int32Ty, Idx)) 1249 return Error("Invalid INSERTELT record"); 1250 I = new InsertElementInst(Vec, Elt, Idx); 1251 break; 1252 } 1253 1254 case bitc::FUNC_CODE_INST_SHUFFLEVEC: {// SHUFFLEVEC: [opval,ty,opval,opval] 1255 unsigned OpNum = 0; 1256 Value *Vec1, *Vec2, *Mask; 1257 if (getValueTypePair(Record, OpNum, NextValueNo, Vec1) || 1258 getValue(Record, OpNum, Vec1->getType(), Vec2)) 1259 return Error("Invalid SHUFFLEVEC record"); 1260 1261 const Type *MaskTy = 1262 VectorType::get(Type::Int32Ty, 1263 cast<VectorType>(Vec1->getType())->getNumElements()); 1264 1265 if (getValue(Record, OpNum, MaskTy, Mask)) 1266 return Error("Invalid SHUFFLEVEC record"); 1267 I = new ShuffleVectorInst(Vec1, Vec2, Mask); 1268 break; 1269 } 1270 1271 case bitc::FUNC_CODE_INST_CMP: { // CMP: [opty, opval, opval, pred] 1272 unsigned OpNum = 0; 1273 Value *LHS, *RHS; 1274 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) || 1275 getValue(Record, OpNum, LHS->getType(), RHS) || 1276 OpNum+1 != Record.size()) 1277 return Error("Invalid CMP record"); 1278 1279 if (LHS->getType()->isFPOrFPVector()) 1280 I = new FCmpInst((FCmpInst::Predicate)Record[OpNum], LHS, RHS); 1281 else 1282 I = new ICmpInst((ICmpInst::Predicate)Record[OpNum], LHS, RHS); 1283 break; 1284 } 1285 1286 case bitc::FUNC_CODE_INST_RET: // RET: [opty,opval<optional>] 1287 if (Record.size() == 0) { 1288 I = new ReturnInst(); 1289 break; 1290 } else { 1291 unsigned OpNum = 0; 1292 Value *Op; 1293 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1294 OpNum != Record.size()) 1295 return Error("Invalid RET record"); 1296 I = new ReturnInst(Op); 1297 break; 1298 } 1299 case bitc::FUNC_CODE_INST_BR: { // BR: [bb#, bb#, opval] or [bb#] 1300 if (Record.size() != 1 && Record.size() != 3) 1301 return Error("Invalid BR record"); 1302 BasicBlock *TrueDest = getBasicBlock(Record[0]); 1303 if (TrueDest == 0) 1304 return Error("Invalid BR record"); 1305 1306 if (Record.size() == 1) 1307 I = new BranchInst(TrueDest); 1308 else { 1309 BasicBlock *FalseDest = getBasicBlock(Record[1]); 1310 Value *Cond = getFnValueByID(Record[2], Type::Int1Ty); 1311 if (FalseDest == 0 || Cond == 0) 1312 return Error("Invalid BR record"); 1313 I = new BranchInst(TrueDest, FalseDest, Cond); 1314 } 1315 break; 1316 } 1317 case bitc::FUNC_CODE_INST_SWITCH: { // SWITCH: [opty, opval, n, n x ops] 1318 if (Record.size() < 3 || (Record.size() & 1) == 0) 1319 return Error("Invalid SWITCH record"); 1320 const Type *OpTy = getTypeByID(Record[0]); 1321 Value *Cond = getFnValueByID(Record[1], OpTy); 1322 BasicBlock *Default = getBasicBlock(Record[2]); 1323 if (OpTy == 0 || Cond == 0 || Default == 0) 1324 return Error("Invalid SWITCH record"); 1325 unsigned NumCases = (Record.size()-3)/2; 1326 SwitchInst *SI = new SwitchInst(Cond, Default, NumCases); 1327 for (unsigned i = 0, e = NumCases; i != e; ++i) { 1328 ConstantInt *CaseVal = 1329 dyn_cast_or_null<ConstantInt>(getFnValueByID(Record[3+i*2], OpTy)); 1330 BasicBlock *DestBB = getBasicBlock(Record[1+3+i*2]); 1331 if (CaseVal == 0 || DestBB == 0) { 1332 delete SI; 1333 return Error("Invalid SWITCH record!"); 1334 } 1335 SI->addCase(CaseVal, DestBB); 1336 } 1337 I = SI; 1338 break; 1339 } 1340 1341 case bitc::FUNC_CODE_INST_INVOKE: { // INVOKE: [cc,fnty, op0,op1,op2, ...] 1342 if (Record.size() < 4) return Error("Invalid INVOKE record"); 1343 unsigned CCInfo = Record[1]; 1344 BasicBlock *NormalBB = getBasicBlock(Record[2]); 1345 BasicBlock *UnwindBB = getBasicBlock(Record[3]); 1346 1347 unsigned OpNum = 4; 1348 Value *Callee; 1349 if (getValueTypePair(Record, OpNum, NextValueNo, Callee)) 1350 return Error("Invalid INVOKE record"); 1351 1352 const PointerType *CalleeTy = dyn_cast<PointerType>(Callee->getType()); 1353 const FunctionType *FTy = !CalleeTy ? 0 : 1354 dyn_cast<FunctionType>(CalleeTy->getElementType()); 1355 1356 // Check that the right number of fixed parameters are here. 1357 if (FTy == 0 || NormalBB == 0 || UnwindBB == 0 || 1358 Record.size() < OpNum+FTy->getNumParams()) 1359 return Error("Invalid INVOKE record"); 1360 1361 assert(FTy->getParamAttrs() == getParamAttrs(Record[0])); 1362 1363 SmallVector<Value*, 16> Ops; 1364 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) { 1365 Ops.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i))); 1366 if (Ops.back() == 0) return Error("Invalid INVOKE record"); 1367 } 1368 1369 if (!FTy->isVarArg()) { 1370 if (Record.size() != OpNum) 1371 return Error("Invalid INVOKE record"); 1372 } else { 1373 // Read type/value pairs for varargs params. 1374 while (OpNum != Record.size()) { 1375 Value *Op; 1376 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 1377 return Error("Invalid INVOKE record"); 1378 Ops.push_back(Op); 1379 } 1380 } 1381 1382 I = new InvokeInst(Callee, NormalBB, UnwindBB, &Ops[0], Ops.size()); 1383 cast<InvokeInst>(I)->setCallingConv(CCInfo); 1384 break; 1385 } 1386 case bitc::FUNC_CODE_INST_UNWIND: // UNWIND 1387 I = new UnwindInst(); 1388 break; 1389 case bitc::FUNC_CODE_INST_UNREACHABLE: // UNREACHABLE 1390 I = new UnreachableInst(); 1391 break; 1392 case bitc::FUNC_CODE_INST_PHI: { // PHI: [ty, val0,bb0, ...] 1393 if (Record.size() < 1 || ((Record.size()-1)&1)) 1394 return Error("Invalid PHI record"); 1395 const Type *Ty = getTypeByID(Record[0]); 1396 if (!Ty) return Error("Invalid PHI record"); 1397 1398 PHINode *PN = new PHINode(Ty); 1399 PN->reserveOperandSpace(Record.size()-1); 1400 1401 for (unsigned i = 0, e = Record.size()-1; i != e; i += 2) { 1402 Value *V = getFnValueByID(Record[1+i], Ty); 1403 BasicBlock *BB = getBasicBlock(Record[2+i]); 1404 if (!V || !BB) return Error("Invalid PHI record"); 1405 PN->addIncoming(V, BB); 1406 } 1407 I = PN; 1408 break; 1409 } 1410 1411 case bitc::FUNC_CODE_INST_MALLOC: { // MALLOC: [instty, op, align] 1412 if (Record.size() < 3) 1413 return Error("Invalid MALLOC record"); 1414 const PointerType *Ty = 1415 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1416 Value *Size = getFnValueByID(Record[1], Type::Int32Ty); 1417 unsigned Align = Record[2]; 1418 if (!Ty || !Size) return Error("Invalid MALLOC record"); 1419 I = new MallocInst(Ty->getElementType(), Size, (1 << Align) >> 1); 1420 break; 1421 } 1422 case bitc::FUNC_CODE_INST_FREE: { // FREE: [op, opty] 1423 unsigned OpNum = 0; 1424 Value *Op; 1425 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1426 OpNum != Record.size()) 1427 return Error("Invalid FREE record"); 1428 I = new FreeInst(Op); 1429 break; 1430 } 1431 case bitc::FUNC_CODE_INST_ALLOCA: { // ALLOCA: [instty, op, align] 1432 if (Record.size() < 3) 1433 return Error("Invalid ALLOCA record"); 1434 const PointerType *Ty = 1435 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1436 Value *Size = getFnValueByID(Record[1], Type::Int32Ty); 1437 unsigned Align = Record[2]; 1438 if (!Ty || !Size) return Error("Invalid ALLOCA record"); 1439 I = new AllocaInst(Ty->getElementType(), Size, (1 << Align) >> 1); 1440 break; 1441 } 1442 case bitc::FUNC_CODE_INST_LOAD: { // LOAD: [opty, op, align, vol] 1443 unsigned OpNum = 0; 1444 Value *Op; 1445 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1446 OpNum+2 != Record.size()) 1447 return Error("Invalid LOAD record"); 1448 1449 I = new LoadInst(Op, "", Record[OpNum+1], (1 << Record[OpNum]) >> 1); 1450 break; 1451 } 1452 case bitc::FUNC_CODE_INST_STORE: { // STORE:[val, valty, ptr, align, vol] 1453 unsigned OpNum = 0; 1454 Value *Val, *Ptr; 1455 if (getValueTypePair(Record, OpNum, NextValueNo, Val) || 1456 getValue(Record, OpNum, PointerType::get(Val->getType()), Ptr) || 1457 OpNum+2 != Record.size()) 1458 return Error("Invalid STORE record"); 1459 1460 I = new StoreInst(Val, Ptr, Record[OpNum+1], (1 << Record[OpNum]) >> 1); 1461 break; 1462 } 1463 case bitc::FUNC_CODE_INST_CALL: { // CALL: [cc, fnty, fnid, arg0, arg1...] 1464 if (Record.size() < 2) 1465 return Error("Invalid CALL record"); 1466 1467 unsigned CCInfo = Record[1]; 1468 1469 unsigned OpNum = 2; 1470 Value *Callee; 1471 if (getValueTypePair(Record, OpNum, NextValueNo, Callee)) 1472 return Error("Invalid CALL record"); 1473 1474 const PointerType *OpTy = dyn_cast<PointerType>(Callee->getType()); 1475 const FunctionType *FTy = 0; 1476 if (OpTy) FTy = dyn_cast<FunctionType>(OpTy->getElementType()); 1477 if (!FTy || Record.size() < FTy->getNumParams()+OpNum) 1478 return Error("Invalid CALL record"); 1479 1480 assert(FTy->getParamAttrs() == getParamAttrs(Record[0])); 1481 1482 SmallVector<Value*, 16> Args; 1483 // Read the fixed params. 1484 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) { 1485 Args.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i))); 1486 if (Args.back() == 0) return Error("Invalid CALL record"); 1487 } 1488 1489 // Read type/value pairs for varargs params. 1490 if (!FTy->isVarArg()) { 1491 if (OpNum != Record.size()) 1492 return Error("Invalid CALL record"); 1493 } else { 1494 while (OpNum != Record.size()) { 1495 Value *Op; 1496 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 1497 return Error("Invalid CALL record"); 1498 Args.push_back(Op); 1499 } 1500 } 1501 1502 I = new CallInst(Callee, &Args[0], Args.size()); 1503 cast<CallInst>(I)->setCallingConv(CCInfo>>1); 1504 cast<CallInst>(I)->setTailCall(CCInfo & 1); 1505 break; 1506 } 1507 case bitc::FUNC_CODE_INST_VAARG: { // VAARG: [valistty, valist, instty] 1508 if (Record.size() < 3) 1509 return Error("Invalid VAARG record"); 1510 const Type *OpTy = getTypeByID(Record[0]); 1511 Value *Op = getFnValueByID(Record[1], OpTy); 1512 const Type *ResTy = getTypeByID(Record[2]); 1513 if (!OpTy || !Op || !ResTy) 1514 return Error("Invalid VAARG record"); 1515 I = new VAArgInst(Op, ResTy); 1516 break; 1517 } 1518 } 1519 1520 // Add instruction to end of current BB. If there is no current BB, reject 1521 // this file. 1522 if (CurBB == 0) { 1523 delete I; 1524 return Error("Invalid instruction with no BB"); 1525 } 1526 CurBB->getInstList().push_back(I); 1527 1528 // If this was a terminator instruction, move to the next block. 1529 if (isa<TerminatorInst>(I)) { 1530 ++CurBBNo; 1531 CurBB = CurBBNo < FunctionBBs.size() ? FunctionBBs[CurBBNo] : 0; 1532 } 1533 1534 // Non-void values get registered in the value table for future use. 1535 if (I && I->getType() != Type::VoidTy) 1536 ValueList.AssignValue(I, NextValueNo++); 1537 } 1538 1539 // Check the function list for unresolved values. 1540 if (Argument *A = dyn_cast<Argument>(ValueList.back())) { 1541 if (A->getParent() == 0) { 1542 // We found at least one unresolved value. Nuke them all to avoid leaks. 1543 for (unsigned i = ModuleValueListSize, e = ValueList.size(); i != e; ++i){ 1544 if ((A = dyn_cast<Argument>(ValueList.back())) && A->getParent() == 0) { 1545 A->replaceAllUsesWith(UndefValue::get(A->getType())); 1546 delete A; 1547 } 1548 } 1549 return Error("Never resolved value found in function!"); 1550 } 1551 } 1552 1553 // Trim the value list down to the size it was before we parsed this function. 1554 ValueList.shrinkTo(ModuleValueListSize); 1555 std::vector<BasicBlock*>().swap(FunctionBBs); 1556 1557 return false; 1558} 1559 1560//===----------------------------------------------------------------------===// 1561// ModuleProvider implementation 1562//===----------------------------------------------------------------------===// 1563 1564 1565bool BitcodeReader::materializeFunction(Function *F, std::string *ErrInfo) { 1566 // If it already is material, ignore the request. 1567 if (!F->hasNotBeenReadFromBytecode()) return false; 1568 1569 DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator DFII = 1570 DeferredFunctionInfo.find(F); 1571 assert(DFII != DeferredFunctionInfo.end() && "Deferred function not found!"); 1572 1573 // Move the bit stream to the saved position of the deferred function body and 1574 // restore the real linkage type for the function. 1575 Stream.JumpToBit(DFII->second.first); 1576 F->setLinkage((GlobalValue::LinkageTypes)DFII->second.second); 1577 1578 if (ParseFunctionBody(F)) { 1579 if (ErrInfo) *ErrInfo = ErrorString; 1580 return true; 1581 } 1582 1583 return false; 1584} 1585 1586void BitcodeReader::dematerializeFunction(Function *F) { 1587 // If this function isn't materialized, or if it is a proto, this is a noop. 1588 if (F->hasNotBeenReadFromBytecode() || F->isDeclaration()) 1589 return; 1590 1591 assert(DeferredFunctionInfo.count(F) && "No info to read function later?"); 1592 1593 // Just forget the function body, we can remat it later. 1594 F->deleteBody(); 1595 F->setLinkage(GlobalValue::GhostLinkage); 1596} 1597 1598 1599Module *BitcodeReader::materializeModule(std::string *ErrInfo) { 1600 for (DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator I = 1601 DeferredFunctionInfo.begin(), E = DeferredFunctionInfo.end(); I != E; 1602 ++I) { 1603 Function *F = I->first; 1604 if (F->hasNotBeenReadFromBytecode() && 1605 materializeFunction(F, ErrInfo)) 1606 return 0; 1607 } 1608 return TheModule; 1609} 1610 1611 1612/// This method is provided by the parent ModuleProvde class and overriden 1613/// here. It simply releases the module from its provided and frees up our 1614/// state. 1615/// @brief Release our hold on the generated module 1616Module *BitcodeReader::releaseModule(std::string *ErrInfo) { 1617 // Since we're losing control of this Module, we must hand it back complete 1618 Module *M = ModuleProvider::releaseModule(ErrInfo); 1619 FreeState(); 1620 return M; 1621} 1622 1623 1624//===----------------------------------------------------------------------===// 1625// External interface 1626//===----------------------------------------------------------------------===// 1627 1628/// getBitcodeModuleProvider - lazy function-at-a-time loading from a file. 1629/// 1630ModuleProvider *llvm::getBitcodeModuleProvider(MemoryBuffer *Buffer, 1631 std::string *ErrMsg) { 1632 BitcodeReader *R = new BitcodeReader(Buffer); 1633 if (R->ParseBitcode()) { 1634 if (ErrMsg) 1635 *ErrMsg = R->getErrorString(); 1636 1637 // Don't let the BitcodeReader dtor delete 'Buffer'. 1638 R->releaseMemoryBuffer(); 1639 delete R; 1640 return 0; 1641 } 1642 return R; 1643} 1644 1645/// ParseBitcodeFile - Read the specified bitcode file, returning the module. 1646/// If an error occurs, return null and fill in *ErrMsg if non-null. 1647Module *llvm::ParseBitcodeFile(MemoryBuffer *Buffer, std::string *ErrMsg){ 1648 BitcodeReader *R; 1649 R = static_cast<BitcodeReader*>(getBitcodeModuleProvider(Buffer, ErrMsg)); 1650 if (!R) return 0; 1651 1652 // Read in the entire module. 1653 Module *M = R->materializeModule(ErrMsg); 1654 1655 // Don't let the BitcodeReader dtor delete 'Buffer', regardless of whether 1656 // there was an error. 1657 R->releaseMemoryBuffer(); 1658 1659 // If there was no error, tell ModuleProvider not to delete it when its dtor 1660 // is run. 1661 if (M) 1662 M = R->releaseModule(ErrMsg); 1663 1664 delete R; 1665 return M; 1666} 1667