BitcodeReader.cpp revision 0579f7f17f08649e65ca8673b8983c0f4985ae36
1//===- BitcodeReader.cpp - Internal BitcodeReader implementation ----------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file was developed by Chris Lattner and is distributed under 6// the University of Illinois Open Source License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This header defines the BitcodeReader class. 11// 12//===----------------------------------------------------------------------===// 13 14#include "llvm/Bitcode/ReaderWriter.h" 15#include "BitcodeReader.h" 16#include "llvm/Constants.h" 17#include "llvm/DerivedTypes.h" 18#include "llvm/Instructions.h" 19#include "llvm/Module.h" 20#include "llvm/ADT/SmallString.h" 21#include "llvm/Support/MathExtras.h" 22#include "llvm/Support/MemoryBuffer.h" 23using namespace llvm; 24 25BitcodeReader::~BitcodeReader() { 26 delete Buffer; 27} 28 29 30/// ConvertToString - Convert a string from a record into an std::string, return 31/// true on failure. 32template<typename StrTy> 33static bool ConvertToString(SmallVector<uint64_t, 64> &Record, unsigned Idx, 34 StrTy &Result) { 35 if (Record.size() < Idx+1 || Record.size() < Record[Idx]+Idx+1) 36 return true; 37 38 for (unsigned i = 0, e = Record[Idx]; i != e; ++i) 39 Result += (char)Record[Idx+i+1]; 40 return false; 41} 42 43static GlobalValue::LinkageTypes GetDecodedLinkage(unsigned Val) { 44 switch (Val) { 45 default: // Map unknown/new linkages to external 46 case 0: return GlobalValue::ExternalLinkage; 47 case 1: return GlobalValue::WeakLinkage; 48 case 2: return GlobalValue::AppendingLinkage; 49 case 3: return GlobalValue::InternalLinkage; 50 case 4: return GlobalValue::LinkOnceLinkage; 51 case 5: return GlobalValue::DLLImportLinkage; 52 case 6: return GlobalValue::DLLExportLinkage; 53 case 7: return GlobalValue::ExternalWeakLinkage; 54 } 55} 56 57static GlobalValue::VisibilityTypes GetDecodedVisibility(unsigned Val) { 58 switch (Val) { 59 default: // Map unknown visibilities to default. 60 case 0: return GlobalValue::DefaultVisibility; 61 case 1: return GlobalValue::HiddenVisibility; 62 case 2: return GlobalValue::ProtectedVisibility; 63 } 64} 65 66static int GetDecodedCastOpcode(unsigned Val) { 67 switch (Val) { 68 default: return -1; 69 case bitc::CAST_TRUNC : return Instruction::Trunc; 70 case bitc::CAST_ZEXT : return Instruction::ZExt; 71 case bitc::CAST_SEXT : return Instruction::SExt; 72 case bitc::CAST_FPTOUI : return Instruction::FPToUI; 73 case bitc::CAST_FPTOSI : return Instruction::FPToSI; 74 case bitc::CAST_UITOFP : return Instruction::UIToFP; 75 case bitc::CAST_SITOFP : return Instruction::SIToFP; 76 case bitc::CAST_FPTRUNC : return Instruction::FPTrunc; 77 case bitc::CAST_FPEXT : return Instruction::FPExt; 78 case bitc::CAST_PTRTOINT: return Instruction::PtrToInt; 79 case bitc::CAST_INTTOPTR: return Instruction::IntToPtr; 80 case bitc::CAST_BITCAST : return Instruction::BitCast; 81 } 82} 83static int GetDecodedBinaryOpcode(unsigned Val, const Type *Ty) { 84 switch (Val) { 85 default: return -1; 86 case bitc::BINOP_ADD: return Instruction::Add; 87 case bitc::BINOP_SUB: return Instruction::Sub; 88 case bitc::BINOP_MUL: return Instruction::Mul; 89 case bitc::BINOP_UDIV: return Instruction::UDiv; 90 case bitc::BINOP_SDIV: 91 return Ty->isFPOrFPVector() ? Instruction::FDiv : Instruction::SDiv; 92 case bitc::BINOP_UREM: return Instruction::URem; 93 case bitc::BINOP_SREM: 94 return Ty->isFPOrFPVector() ? Instruction::FRem : Instruction::SRem; 95 case bitc::BINOP_SHL: return Instruction::Shl; 96 case bitc::BINOP_LSHR: return Instruction::LShr; 97 case bitc::BINOP_ASHR: return Instruction::AShr; 98 case bitc::BINOP_AND: return Instruction::And; 99 case bitc::BINOP_OR: return Instruction::Or; 100 case bitc::BINOP_XOR: return Instruction::Xor; 101 } 102} 103 104 105namespace { 106 /// @brief A class for maintaining the slot number definition 107 /// as a placeholder for the actual definition for forward constants defs. 108 class ConstantPlaceHolder : public ConstantExpr { 109 ConstantPlaceHolder(); // DO NOT IMPLEMENT 110 void operator=(const ConstantPlaceHolder &); // DO NOT IMPLEMENT 111 public: 112 Use Op; 113 ConstantPlaceHolder(const Type *Ty) 114 : ConstantExpr(Ty, Instruction::UserOp1, &Op, 1), 115 Op(UndefValue::get(Type::Int32Ty), this) { 116 } 117 }; 118} 119 120Constant *BitcodeReaderValueList::getConstantFwdRef(unsigned Idx, 121 const Type *Ty) { 122 if (Idx >= size()) { 123 // Insert a bunch of null values. 124 Uses.resize(Idx+1); 125 OperandList = &Uses[0]; 126 NumOperands = Idx+1; 127 } 128 129 if (Value *V = Uses[Idx]) { 130 assert(Ty == V->getType() && "Type mismatch in constant table!"); 131 return cast<Constant>(V); 132 } 133 134 // Create and return a placeholder, which will later be RAUW'd. 135 Constant *C = new ConstantPlaceHolder(Ty); 136 Uses[Idx].init(C, this); 137 return C; 138} 139 140Value *BitcodeReaderValueList::getValueFwdRef(unsigned Idx, const Type *Ty) { 141 if (Idx >= size()) { 142 // Insert a bunch of null values. 143 Uses.resize(Idx+1); 144 OperandList = &Uses[0]; 145 NumOperands = Idx+1; 146 } 147 148 if (Value *V = Uses[Idx]) { 149 assert((Ty == 0 || Ty == V->getType()) && "Type mismatch in value table!"); 150 return V; 151 } 152 153 // No type specified, must be invalid reference. 154 if (Ty == 0) return 0; 155 156 // Create and return a placeholder, which will later be RAUW'd. 157 Value *V = new Argument(Ty); 158 Uses[Idx].init(V, this); 159 return V; 160} 161 162 163const Type *BitcodeReader::getTypeByID(unsigned ID, bool isTypeTable) { 164 // If the TypeID is in range, return it. 165 if (ID < TypeList.size()) 166 return TypeList[ID].get(); 167 if (!isTypeTable) return 0; 168 169 // The type table allows forward references. Push as many Opaque types as 170 // needed to get up to ID. 171 while (TypeList.size() <= ID) 172 TypeList.push_back(OpaqueType::get()); 173 return TypeList.back().get(); 174} 175 176bool BitcodeReader::ParseTypeTable() { 177 if (Stream.EnterSubBlock()) 178 return Error("Malformed block record"); 179 180 if (!TypeList.empty()) 181 return Error("Multiple TYPE_BLOCKs found!"); 182 183 SmallVector<uint64_t, 64> Record; 184 unsigned NumRecords = 0; 185 186 // Read all the records for this type table. 187 while (1) { 188 unsigned Code = Stream.ReadCode(); 189 if (Code == bitc::END_BLOCK) { 190 if (NumRecords != TypeList.size()) 191 return Error("Invalid type forward reference in TYPE_BLOCK"); 192 if (Stream.ReadBlockEnd()) 193 return Error("Error at end of type table block"); 194 return false; 195 } 196 197 if (Code == bitc::ENTER_SUBBLOCK) { 198 // No known subblocks, always skip them. 199 Stream.ReadSubBlockID(); 200 if (Stream.SkipBlock()) 201 return Error("Malformed block record"); 202 continue; 203 } 204 205 if (Code == bitc::DEFINE_ABBREV) { 206 Stream.ReadAbbrevRecord(); 207 continue; 208 } 209 210 // Read a record. 211 Record.clear(); 212 const Type *ResultTy = 0; 213 switch (Stream.ReadRecord(Code, Record)) { 214 default: // Default behavior: unknown type. 215 ResultTy = 0; 216 break; 217 case bitc::TYPE_CODE_NUMENTRY: // TYPE_CODE_NUMENTRY: [numentries] 218 // TYPE_CODE_NUMENTRY contains a count of the number of types in the 219 // type list. This allows us to reserve space. 220 if (Record.size() < 1) 221 return Error("Invalid TYPE_CODE_NUMENTRY record"); 222 TypeList.reserve(Record[0]); 223 continue; 224 case bitc::TYPE_CODE_META: // TYPE_CODE_META: [metacode]... 225 // No metadata supported yet. 226 if (Record.size() < 1) 227 return Error("Invalid TYPE_CODE_META record"); 228 continue; 229 230 case bitc::TYPE_CODE_VOID: // VOID 231 ResultTy = Type::VoidTy; 232 break; 233 case bitc::TYPE_CODE_FLOAT: // FLOAT 234 ResultTy = Type::FloatTy; 235 break; 236 case bitc::TYPE_CODE_DOUBLE: // DOUBLE 237 ResultTy = Type::DoubleTy; 238 break; 239 case bitc::TYPE_CODE_LABEL: // LABEL 240 ResultTy = Type::LabelTy; 241 break; 242 case bitc::TYPE_CODE_OPAQUE: // OPAQUE 243 ResultTy = 0; 244 break; 245 case bitc::TYPE_CODE_INTEGER: // INTEGER: [width] 246 if (Record.size() < 1) 247 return Error("Invalid Integer type record"); 248 249 ResultTy = IntegerType::get(Record[0]); 250 break; 251 case bitc::TYPE_CODE_POINTER: // POINTER: [pointee type] 252 if (Record.size() < 1) 253 return Error("Invalid POINTER type record"); 254 ResultTy = PointerType::get(getTypeByID(Record[0], true)); 255 break; 256 case bitc::TYPE_CODE_FUNCTION: { 257 // FUNCTION: [vararg, retty, #pararms, paramty N] 258 if (Record.size() < 3 || Record.size() < Record[2]+3) 259 return Error("Invalid FUNCTION type record"); 260 std::vector<const Type*> ArgTys; 261 for (unsigned i = 0, e = Record[2]; i != e; ++i) 262 ArgTys.push_back(getTypeByID(Record[3+i], true)); 263 264 // FIXME: PARAM TYS. 265 ResultTy = FunctionType::get(getTypeByID(Record[1], true), ArgTys, 266 Record[0]); 267 break; 268 } 269 case bitc::TYPE_CODE_STRUCT: { // STRUCT: [ispacked, #elts, eltty x N] 270 if (Record.size() < 2 || Record.size() < Record[1]+2) 271 return Error("Invalid STRUCT type record"); 272 std::vector<const Type*> EltTys; 273 for (unsigned i = 0, e = Record[1]; i != e; ++i) 274 EltTys.push_back(getTypeByID(Record[2+i], true)); 275 ResultTy = StructType::get(EltTys, Record[0]); 276 break; 277 } 278 case bitc::TYPE_CODE_ARRAY: // ARRAY: [numelts, eltty] 279 if (Record.size() < 2) 280 return Error("Invalid ARRAY type record"); 281 ResultTy = ArrayType::get(getTypeByID(Record[1], true), Record[0]); 282 break; 283 case bitc::TYPE_CODE_VECTOR: // VECTOR: [numelts, eltty] 284 if (Record.size() < 2) 285 return Error("Invalid VECTOR type record"); 286 ResultTy = VectorType::get(getTypeByID(Record[1], true), Record[0]); 287 break; 288 } 289 290 if (NumRecords == TypeList.size()) { 291 // If this is a new type slot, just append it. 292 TypeList.push_back(ResultTy ? ResultTy : OpaqueType::get()); 293 ++NumRecords; 294 } else if (ResultTy == 0) { 295 // Otherwise, this was forward referenced, so an opaque type was created, 296 // but the result type is actually just an opaque. Leave the one we 297 // created previously. 298 ++NumRecords; 299 } else { 300 // Otherwise, this was forward referenced, so an opaque type was created. 301 // Resolve the opaque type to the real type now. 302 assert(NumRecords < TypeList.size() && "Typelist imbalance"); 303 const OpaqueType *OldTy = cast<OpaqueType>(TypeList[NumRecords++].get()); 304 305 // Don't directly push the new type on the Tab. Instead we want to replace 306 // the opaque type we previously inserted with the new concrete value. The 307 // refinement from the abstract (opaque) type to the new type causes all 308 // uses of the abstract type to use the concrete type (NewTy). This will 309 // also cause the opaque type to be deleted. 310 const_cast<OpaqueType*>(OldTy)->refineAbstractTypeTo(ResultTy); 311 312 // This should have replaced the old opaque type with the new type in the 313 // value table... or with a preexisting type that was already in the 314 // system. Let's just make sure it did. 315 assert(TypeList[NumRecords-1].get() != OldTy && 316 "refineAbstractType didn't work!"); 317 } 318 } 319} 320 321 322bool BitcodeReader::ParseTypeSymbolTable() { 323 if (Stream.EnterSubBlock()) 324 return Error("Malformed block record"); 325 326 SmallVector<uint64_t, 64> Record; 327 328 // Read all the records for this type table. 329 std::string TypeName; 330 while (1) { 331 unsigned Code = Stream.ReadCode(); 332 if (Code == bitc::END_BLOCK) { 333 if (Stream.ReadBlockEnd()) 334 return Error("Error at end of type symbol table block"); 335 return false; 336 } 337 338 if (Code == bitc::ENTER_SUBBLOCK) { 339 // No known subblocks, always skip them. 340 Stream.ReadSubBlockID(); 341 if (Stream.SkipBlock()) 342 return Error("Malformed block record"); 343 continue; 344 } 345 346 if (Code == bitc::DEFINE_ABBREV) { 347 Stream.ReadAbbrevRecord(); 348 continue; 349 } 350 351 // Read a record. 352 Record.clear(); 353 switch (Stream.ReadRecord(Code, Record)) { 354 default: // Default behavior: unknown type. 355 break; 356 case bitc::TST_CODE_ENTRY: // TST_ENTRY: [typeid, namelen, namechar x N] 357 if (ConvertToString(Record, 1, TypeName)) 358 return Error("Invalid TST_ENTRY record"); 359 unsigned TypeID = Record[0]; 360 if (TypeID >= TypeList.size()) 361 return Error("Invalid Type ID in TST_ENTRY record"); 362 363 TheModule->addTypeName(TypeName, TypeList[TypeID].get()); 364 TypeName.clear(); 365 break; 366 } 367 } 368} 369 370bool BitcodeReader::ParseValueSymbolTable() { 371 if (Stream.EnterSubBlock()) 372 return Error("Malformed block record"); 373 374 SmallVector<uint64_t, 64> Record; 375 376 // Read all the records for this value table. 377 SmallString<128> ValueName; 378 while (1) { 379 unsigned Code = Stream.ReadCode(); 380 if (Code == bitc::END_BLOCK) { 381 if (Stream.ReadBlockEnd()) 382 return Error("Error at end of value symbol table block"); 383 return false; 384 } 385 if (Code == bitc::ENTER_SUBBLOCK) { 386 // No known subblocks, always skip them. 387 Stream.ReadSubBlockID(); 388 if (Stream.SkipBlock()) 389 return Error("Malformed block record"); 390 continue; 391 } 392 393 if (Code == bitc::DEFINE_ABBREV) { 394 Stream.ReadAbbrevRecord(); 395 continue; 396 } 397 398 // Read a record. 399 Record.clear(); 400 switch (Stream.ReadRecord(Code, Record)) { 401 default: // Default behavior: unknown type. 402 break; 403 case bitc::TST_CODE_ENTRY: // VST_ENTRY: [valueid, namelen, namechar x N] 404 if (ConvertToString(Record, 1, ValueName)) 405 return Error("Invalid TST_ENTRY record"); 406 unsigned ValueID = Record[0]; 407 if (ValueID >= ValueList.size()) 408 return Error("Invalid Value ID in VST_ENTRY record"); 409 Value *V = ValueList[ValueID]; 410 411 V->setName(&ValueName[0], ValueName.size()); 412 ValueName.clear(); 413 break; 414 } 415 } 416} 417 418/// DecodeSignRotatedValue - Decode a signed value stored with the sign bit in 419/// the LSB for dense VBR encoding. 420static uint64_t DecodeSignRotatedValue(uint64_t V) { 421 if ((V & 1) == 0) 422 return V >> 1; 423 if (V != 1) 424 return -(V >> 1); 425 // There is no such thing as -0 with integers. "-0" really means MININT. 426 return 1ULL << 63; 427} 428 429/// ResolveGlobalAndAliasInits - Resolve all of the initializers for global 430/// values and aliases that we can. 431bool BitcodeReader::ResolveGlobalAndAliasInits() { 432 std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInitWorklist; 433 std::vector<std::pair<GlobalAlias*, unsigned> > AliasInitWorklist; 434 435 GlobalInitWorklist.swap(GlobalInits); 436 AliasInitWorklist.swap(AliasInits); 437 438 while (!GlobalInitWorklist.empty()) { 439 unsigned ValID = GlobalInitWorklist.back().second; 440 if (ValID >= ValueList.size()) { 441 // Not ready to resolve this yet, it requires something later in the file. 442 GlobalInits.push_back(GlobalInitWorklist.back()); 443 } else { 444 if (Constant *C = dyn_cast<Constant>(ValueList[ValID])) 445 GlobalInitWorklist.back().first->setInitializer(C); 446 else 447 return Error("Global variable initializer is not a constant!"); 448 } 449 GlobalInitWorklist.pop_back(); 450 } 451 452 while (!AliasInitWorklist.empty()) { 453 unsigned ValID = AliasInitWorklist.back().second; 454 if (ValID >= ValueList.size()) { 455 AliasInits.push_back(AliasInitWorklist.back()); 456 } else { 457 if (Constant *C = dyn_cast<Constant>(ValueList[ValID])) 458 AliasInitWorklist.back().first->setAliasee(C); 459 else 460 return Error("Alias initializer is not a constant!"); 461 } 462 AliasInitWorklist.pop_back(); 463 } 464 return false; 465} 466 467 468bool BitcodeReader::ParseConstants() { 469 if (Stream.EnterSubBlock()) 470 return Error("Malformed block record"); 471 472 SmallVector<uint64_t, 64> Record; 473 474 // Read all the records for this value table. 475 const Type *CurTy = Type::Int32Ty; 476 unsigned NextCstNo = ValueList.size(); 477 while (1) { 478 unsigned Code = Stream.ReadCode(); 479 if (Code == bitc::END_BLOCK) { 480 if (NextCstNo != ValueList.size()) 481 return Error("Invalid constant reference!"); 482 483 if (Stream.ReadBlockEnd()) 484 return Error("Error at end of constants block"); 485 return false; 486 } 487 488 if (Code == bitc::ENTER_SUBBLOCK) { 489 // No known subblocks, always skip them. 490 Stream.ReadSubBlockID(); 491 if (Stream.SkipBlock()) 492 return Error("Malformed block record"); 493 continue; 494 } 495 496 if (Code == bitc::DEFINE_ABBREV) { 497 Stream.ReadAbbrevRecord(); 498 continue; 499 } 500 501 // Read a record. 502 Record.clear(); 503 Value *V = 0; 504 switch (Stream.ReadRecord(Code, Record)) { 505 default: // Default behavior: unknown constant 506 case bitc::CST_CODE_UNDEF: // UNDEF 507 V = UndefValue::get(CurTy); 508 break; 509 case bitc::CST_CODE_SETTYPE: // SETTYPE: [typeid] 510 if (Record.empty()) 511 return Error("Malformed CST_SETTYPE record"); 512 if (Record[0] >= TypeList.size()) 513 return Error("Invalid Type ID in CST_SETTYPE record"); 514 CurTy = TypeList[Record[0]]; 515 continue; // Skip the ValueList manipulation. 516 case bitc::CST_CODE_NULL: // NULL 517 V = Constant::getNullValue(CurTy); 518 break; 519 case bitc::CST_CODE_INTEGER: // INTEGER: [intval] 520 if (!isa<IntegerType>(CurTy) || Record.empty()) 521 return Error("Invalid CST_INTEGER record"); 522 V = ConstantInt::get(CurTy, DecodeSignRotatedValue(Record[0])); 523 break; 524 case bitc::CST_CODE_WIDE_INTEGER: {// WIDE_INTEGER: [n, n x intval] 525 if (!isa<IntegerType>(CurTy) || Record.empty() || 526 Record.size() < Record[0]+1) 527 return Error("Invalid WIDE_INTEGER record"); 528 529 unsigned NumWords = Record[0]; 530 SmallVector<uint64_t, 8> Words; 531 Words.resize(NumWords); 532 for (unsigned i = 0; i != NumWords; ++i) 533 Words[i] = DecodeSignRotatedValue(Record[i+1]); 534 V = ConstantInt::get(APInt(cast<IntegerType>(CurTy)->getBitWidth(), 535 NumWords, &Words[0])); 536 break; 537 } 538 case bitc::CST_CODE_FLOAT: // FLOAT: [fpval] 539 if (Record.empty()) 540 return Error("Invalid FLOAT record"); 541 if (CurTy == Type::FloatTy) 542 V = ConstantFP::get(CurTy, BitsToFloat(Record[0])); 543 else if (CurTy == Type::DoubleTy) 544 V = ConstantFP::get(CurTy, BitsToDouble(Record[0])); 545 else 546 V = UndefValue::get(CurTy); 547 break; 548 549 case bitc::CST_CODE_AGGREGATE: {// AGGREGATE: [n, n x value number] 550 if (Record.empty() || Record.size() < Record[0]+1) 551 return Error("Invalid CST_AGGREGATE record"); 552 553 unsigned Size = Record[0]; 554 std::vector<Constant*> Elts; 555 556 if (const StructType *STy = dyn_cast<StructType>(CurTy)) { 557 for (unsigned i = 0; i != Size; ++i) 558 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], 559 STy->getElementType(i))); 560 V = ConstantStruct::get(STy, Elts); 561 } else if (const ArrayType *ATy = dyn_cast<ArrayType>(CurTy)) { 562 const Type *EltTy = ATy->getElementType(); 563 for (unsigned i = 0; i != Size; ++i) 564 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], EltTy)); 565 V = ConstantArray::get(ATy, Elts); 566 } else if (const VectorType *VTy = dyn_cast<VectorType>(CurTy)) { 567 const Type *EltTy = VTy->getElementType(); 568 for (unsigned i = 0; i != Size; ++i) 569 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], EltTy)); 570 V = ConstantVector::get(Elts); 571 } else { 572 V = UndefValue::get(CurTy); 573 } 574 break; 575 } 576 577 case bitc::CST_CODE_CE_BINOP: { // CE_BINOP: [opcode, opval, opval] 578 if (Record.size() < 3) return Error("Invalid CE_BINOP record"); 579 int Opc = GetDecodedBinaryOpcode(Record[0], CurTy); 580 if (Opc < 0) { 581 V = UndefValue::get(CurTy); // Unknown binop. 582 } else { 583 Constant *LHS = ValueList.getConstantFwdRef(Record[1], CurTy); 584 Constant *RHS = ValueList.getConstantFwdRef(Record[2], CurTy); 585 V = ConstantExpr::get(Opc, LHS, RHS); 586 } 587 break; 588 } 589 case bitc::CST_CODE_CE_CAST: { // CE_CAST: [opcode, opty, opval] 590 if (Record.size() < 3) return Error("Invalid CE_CAST record"); 591 int Opc = GetDecodedCastOpcode(Record[0]); 592 if (Opc < 0) { 593 V = UndefValue::get(CurTy); // Unknown cast. 594 } else { 595 const Type *OpTy = getTypeByID(Record[1]); 596 Constant *Op = ValueList.getConstantFwdRef(Record[2], OpTy); 597 V = ConstantExpr::getCast(Opc, Op, CurTy); 598 } 599 break; 600 } 601 case bitc::CST_CODE_CE_GEP: { // CE_GEP: [n x operands] 602 if ((Record.size() & 1) == 0) return Error("Invalid CE_GEP record"); 603 SmallVector<Constant*, 16> Elts; 604 for (unsigned i = 1, e = Record.size(); i != e; i += 2) { 605 const Type *ElTy = getTypeByID(Record[i]); 606 if (!ElTy) return Error("Invalid CE_GEP record"); 607 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], ElTy)); 608 } 609 V = ConstantExpr::getGetElementPtr(Elts[0], &Elts[1], Elts.size()-1); 610 break; 611 } 612 case bitc::CST_CODE_CE_SELECT: // CE_SELECT: [opval#, opval#, opval#] 613 if (Record.size() < 3) return Error("Invalid CE_SELECT record"); 614 V = ConstantExpr::getSelect(ValueList.getConstantFwdRef(Record[0], 615 Type::Int1Ty), 616 ValueList.getConstantFwdRef(Record[1],CurTy), 617 ValueList.getConstantFwdRef(Record[2],CurTy)); 618 break; 619 case bitc::CST_CODE_CE_EXTRACTELT: { // CE_EXTRACTELT: [opty, opval, opval] 620 if (Record.size() < 3) return Error("Invalid CE_EXTRACTELT record"); 621 const VectorType *OpTy = 622 dyn_cast_or_null<VectorType>(getTypeByID(Record[0])); 623 if (OpTy == 0) return Error("Invalid CE_EXTRACTELT record"); 624 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 625 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], 626 OpTy->getElementType()); 627 V = ConstantExpr::getExtractElement(Op0, Op1); 628 break; 629 } 630 case bitc::CST_CODE_CE_INSERTELT: { // CE_INSERTELT: [opval, opval, opval] 631 const VectorType *OpTy = dyn_cast<VectorType>(CurTy); 632 if (Record.size() < 3 || OpTy == 0) 633 return Error("Invalid CE_INSERTELT record"); 634 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); 635 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], 636 OpTy->getElementType()); 637 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], Type::Int32Ty); 638 V = ConstantExpr::getInsertElement(Op0, Op1, Op2); 639 break; 640 } 641 case bitc::CST_CODE_CE_SHUFFLEVEC: { // CE_SHUFFLEVEC: [opval, opval, opval] 642 const VectorType *OpTy = dyn_cast<VectorType>(CurTy); 643 if (Record.size() < 3 || OpTy == 0) 644 return Error("Invalid CE_INSERTELT record"); 645 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); 646 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], OpTy); 647 const Type *ShufTy=VectorType::get(Type::Int32Ty, OpTy->getNumElements()); 648 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], ShufTy); 649 V = ConstantExpr::getShuffleVector(Op0, Op1, Op2); 650 break; 651 } 652 case bitc::CST_CODE_CE_CMP: { // CE_CMP: [opty, opval, opval, pred] 653 if (Record.size() < 4) return Error("Invalid CE_CMP record"); 654 const Type *OpTy = getTypeByID(Record[0]); 655 if (OpTy == 0) return Error("Invalid CE_CMP record"); 656 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 657 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy); 658 659 if (OpTy->isFloatingPoint()) 660 V = ConstantExpr::getFCmp(Record[3], Op0, Op1); 661 else 662 V = ConstantExpr::getICmp(Record[3], Op0, Op1); 663 break; 664 } 665 } 666 667 ValueList.AssignValue(V, NextCstNo); 668 ++NextCstNo; 669 } 670} 671 672/// RememberAndSkipFunctionBody - When we see the block for a function body, 673/// remember where it is and then skip it. This lets us lazily deserialize the 674/// functions. 675bool BitcodeReader::RememberAndSkipFunctionBody() { 676 // Get the function we are talking about. 677 if (FunctionsWithBodies.empty()) 678 return Error("Insufficient function protos"); 679 680 Function *Fn = FunctionsWithBodies.back(); 681 FunctionsWithBodies.pop_back(); 682 683 // Save the current stream state. 684 uint64_t CurBit = Stream.GetCurrentBitNo(); 685 DeferredFunctionInfo[Fn] = std::make_pair(CurBit, Fn->getLinkage()); 686 687 // Set the functions linkage to GhostLinkage so we know it is lazily 688 // deserialized. 689 Fn->setLinkage(GlobalValue::GhostLinkage); 690 691 // Skip over the function block for now. 692 if (Stream.SkipBlock()) 693 return Error("Malformed block record"); 694 return false; 695} 696 697bool BitcodeReader::ParseModule(const std::string &ModuleID) { 698 // Reject multiple MODULE_BLOCK's in a single bitstream. 699 if (TheModule) 700 return Error("Multiple MODULE_BLOCKs in same stream"); 701 702 if (Stream.EnterSubBlock()) 703 return Error("Malformed block record"); 704 705 // Otherwise, create the module. 706 TheModule = new Module(ModuleID); 707 708 SmallVector<uint64_t, 64> Record; 709 std::vector<std::string> SectionTable; 710 711 // Read all the records for this module. 712 while (!Stream.AtEndOfStream()) { 713 unsigned Code = Stream.ReadCode(); 714 if (Code == bitc::END_BLOCK) { 715 if (Stream.ReadBlockEnd()) 716 return Error("Error at end of module block"); 717 718 // Patch the initializers for globals and aliases up. 719 ResolveGlobalAndAliasInits(); 720 if (!GlobalInits.empty() || !AliasInits.empty()) 721 return Error("Malformed global initializer set"); 722 if (!FunctionsWithBodies.empty()) 723 return Error("Too few function bodies found"); 724 725 // Force deallocation of memory for these vectors to favor the client that 726 // want lazy deserialization. 727 std::vector<std::pair<GlobalVariable*, unsigned> >().swap(GlobalInits); 728 std::vector<std::pair<GlobalAlias*, unsigned> >().swap(AliasInits); 729 std::vector<Function*>().swap(FunctionsWithBodies); 730 return false; 731 } 732 733 if (Code == bitc::ENTER_SUBBLOCK) { 734 switch (Stream.ReadSubBlockID()) { 735 default: // Skip unknown content. 736 if (Stream.SkipBlock()) 737 return Error("Malformed block record"); 738 break; 739 case bitc::TYPE_BLOCK_ID: 740 if (ParseTypeTable()) 741 return true; 742 break; 743 case bitc::TYPE_SYMTAB_BLOCK_ID: 744 if (ParseTypeSymbolTable()) 745 return true; 746 break; 747 case bitc::VALUE_SYMTAB_BLOCK_ID: 748 if (ParseValueSymbolTable()) 749 return true; 750 break; 751 case bitc::CONSTANTS_BLOCK_ID: 752 if (ParseConstants() || ResolveGlobalAndAliasInits()) 753 return true; 754 break; 755 case bitc::FUNCTION_BLOCK_ID: 756 // If this is the first function body we've seen, reverse the 757 // FunctionsWithBodies list. 758 if (!HasReversedFunctionsWithBodies) { 759 std::reverse(FunctionsWithBodies.begin(), FunctionsWithBodies.end()); 760 HasReversedFunctionsWithBodies = true; 761 } 762 763 if (RememberAndSkipFunctionBody()) 764 return true; 765 break; 766 } 767 continue; 768 } 769 770 if (Code == bitc::DEFINE_ABBREV) { 771 Stream.ReadAbbrevRecord(); 772 continue; 773 } 774 775 // Read a record. 776 switch (Stream.ReadRecord(Code, Record)) { 777 default: break; // Default behavior, ignore unknown content. 778 case bitc::MODULE_CODE_VERSION: // VERSION: [version#] 779 if (Record.size() < 1) 780 return Error("Malformed MODULE_CODE_VERSION"); 781 // Only version #0 is supported so far. 782 if (Record[0] != 0) 783 return Error("Unknown bitstream version!"); 784 break; 785 case bitc::MODULE_CODE_TRIPLE: { // TRIPLE: [strlen, strchr x N] 786 std::string S; 787 if (ConvertToString(Record, 0, S)) 788 return Error("Invalid MODULE_CODE_TRIPLE record"); 789 TheModule->setTargetTriple(S); 790 break; 791 } 792 case bitc::MODULE_CODE_DATALAYOUT: { // DATALAYOUT: [strlen, strchr x N] 793 std::string S; 794 if (ConvertToString(Record, 0, S)) 795 return Error("Invalid MODULE_CODE_DATALAYOUT record"); 796 TheModule->setDataLayout(S); 797 break; 798 } 799 case bitc::MODULE_CODE_ASM: { // ASM: [strlen, strchr x N] 800 std::string S; 801 if (ConvertToString(Record, 0, S)) 802 return Error("Invalid MODULE_CODE_ASM record"); 803 TheModule->setModuleInlineAsm(S); 804 break; 805 } 806 case bitc::MODULE_CODE_DEPLIB: { // DEPLIB: [strlen, strchr x N] 807 std::string S; 808 if (ConvertToString(Record, 0, S)) 809 return Error("Invalid MODULE_CODE_DEPLIB record"); 810 TheModule->addLibrary(S); 811 break; 812 } 813 case bitc::MODULE_CODE_SECTIONNAME: { // SECTIONNAME: [strlen, strchr x N] 814 std::string S; 815 if (ConvertToString(Record, 0, S)) 816 return Error("Invalid MODULE_CODE_SECTIONNAME record"); 817 SectionTable.push_back(S); 818 break; 819 } 820 // GLOBALVAR: [type, isconst, initid, 821 // linkage, alignment, section, visibility, threadlocal] 822 case bitc::MODULE_CODE_GLOBALVAR: { 823 if (Record.size() < 6) 824 return Error("Invalid MODULE_CODE_GLOBALVAR record"); 825 const Type *Ty = getTypeByID(Record[0]); 826 if (!isa<PointerType>(Ty)) 827 return Error("Global not a pointer type!"); 828 Ty = cast<PointerType>(Ty)->getElementType(); 829 830 bool isConstant = Record[1]; 831 GlobalValue::LinkageTypes Linkage = GetDecodedLinkage(Record[3]); 832 unsigned Alignment = (1 << Record[4]) >> 1; 833 std::string Section; 834 if (Record[5]) { 835 if (Record[5]-1 >= SectionTable.size()) 836 return Error("Invalid section ID"); 837 Section = SectionTable[Record[5]-1]; 838 } 839 GlobalValue::VisibilityTypes Visibility = GlobalValue::DefaultVisibility; 840 if (Record.size() >= 6) Visibility = GetDecodedVisibility(Record[6]); 841 bool isThreadLocal = false; 842 if (Record.size() >= 7) isThreadLocal = Record[7]; 843 844 GlobalVariable *NewGV = 845 new GlobalVariable(Ty, isConstant, Linkage, 0, "", TheModule); 846 NewGV->setAlignment(Alignment); 847 if (!Section.empty()) 848 NewGV->setSection(Section); 849 NewGV->setVisibility(Visibility); 850 NewGV->setThreadLocal(isThreadLocal); 851 852 ValueList.push_back(NewGV); 853 854 // Remember which value to use for the global initializer. 855 if (unsigned InitID = Record[2]) 856 GlobalInits.push_back(std::make_pair(NewGV, InitID-1)); 857 break; 858 } 859 // FUNCTION: [type, callingconv, isproto, linkage, alignment, section, 860 // visibility] 861 case bitc::MODULE_CODE_FUNCTION: { 862 if (Record.size() < 7) 863 return Error("Invalid MODULE_CODE_FUNCTION record"); 864 const Type *Ty = getTypeByID(Record[0]); 865 if (!isa<PointerType>(Ty)) 866 return Error("Function not a pointer type!"); 867 const FunctionType *FTy = 868 dyn_cast<FunctionType>(cast<PointerType>(Ty)->getElementType()); 869 if (!FTy) 870 return Error("Function not a pointer to function type!"); 871 872 Function *Func = new Function(FTy, GlobalValue::ExternalLinkage, 873 "", TheModule); 874 875 Func->setCallingConv(Record[1]); 876 bool isProto = Record[2]; 877 Func->setLinkage(GetDecodedLinkage(Record[3])); 878 Func->setAlignment((1 << Record[4]) >> 1); 879 if (Record[5]) { 880 if (Record[5]-1 >= SectionTable.size()) 881 return Error("Invalid section ID"); 882 Func->setSection(SectionTable[Record[5]-1]); 883 } 884 Func->setVisibility(GetDecodedVisibility(Record[6])); 885 886 ValueList.push_back(Func); 887 888 // If this is a function with a body, remember the prototype we are 889 // creating now, so that we can match up the body with them later. 890 if (!isProto) 891 FunctionsWithBodies.push_back(Func); 892 break; 893 } 894 // ALIAS: [alias type, aliasee val#, linkage] 895 case bitc::MODULE_CODE_ALIAS: { 896 if (Record.size() < 3) 897 return Error("Invalid MODULE_ALIAS record"); 898 const Type *Ty = getTypeByID(Record[0]); 899 if (!isa<PointerType>(Ty)) 900 return Error("Function not a pointer type!"); 901 902 GlobalAlias *NewGA = new GlobalAlias(Ty, GetDecodedLinkage(Record[2]), 903 "", 0, TheModule); 904 ValueList.push_back(NewGA); 905 AliasInits.push_back(std::make_pair(NewGA, Record[1])); 906 break; 907 } 908 /// MODULE_CODE_PURGEVALS: [numvals] 909 case bitc::MODULE_CODE_PURGEVALS: 910 // Trim down the value list to the specified size. 911 if (Record.size() < 1 || Record[0] > ValueList.size()) 912 return Error("Invalid MODULE_PURGEVALS record"); 913 ValueList.shrinkTo(Record[0]); 914 break; 915 } 916 Record.clear(); 917 } 918 919 return Error("Premature end of bitstream"); 920} 921 922 923bool BitcodeReader::ParseBitcode() { 924 TheModule = 0; 925 926 if (Buffer->getBufferSize() & 3) 927 return Error("Bitcode stream should be a multiple of 4 bytes in length"); 928 929 unsigned char *BufPtr = (unsigned char *)Buffer->getBufferStart(); 930 Stream.init(BufPtr, BufPtr+Buffer->getBufferSize()); 931 932 // Sniff for the signature. 933 if (Stream.Read(8) != 'B' || 934 Stream.Read(8) != 'C' || 935 Stream.Read(4) != 0x0 || 936 Stream.Read(4) != 0xC || 937 Stream.Read(4) != 0xE || 938 Stream.Read(4) != 0xD) 939 return Error("Invalid bitcode signature"); 940 941 // We expect a number of well-defined blocks, though we don't necessarily 942 // need to understand them all. 943 while (!Stream.AtEndOfStream()) { 944 unsigned Code = Stream.ReadCode(); 945 946 if (Code != bitc::ENTER_SUBBLOCK) 947 return Error("Invalid record at top-level"); 948 949 unsigned BlockID = Stream.ReadSubBlockID(); 950 951 // We only know the MODULE subblock ID. 952 if (BlockID == bitc::MODULE_BLOCK_ID) { 953 if (ParseModule(Buffer->getBufferIdentifier())) 954 return true; 955 } else if (Stream.SkipBlock()) { 956 return Error("Malformed block record"); 957 } 958 } 959 960 return false; 961} 962 963 964bool BitcodeReader::materializeFunction(Function *F, std::string *ErrInfo) { 965 // If it already is material, ignore the request. 966 if (!F->hasNotBeenReadFromBytecode()) return false; 967 968 DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator DFII = 969 DeferredFunctionInfo.find(F); 970 assert(DFII != DeferredFunctionInfo.end() && "Deferred function not found!"); 971 972 // Move the bit stream to the saved position of the deferred function body and 973 // restore the real linkage type for the function. 974 Stream.JumpToBit(DFII->second.first); 975 F->setLinkage((GlobalValue::LinkageTypes)DFII->second.second); 976 DeferredFunctionInfo.erase(DFII); 977 978 if (ParseFunctionBody(F)) { 979 if (ErrInfo) *ErrInfo = ErrorString; 980 return true; 981 } 982 983 return false; 984} 985 986Module *BitcodeReader::materializeModule(std::string *ErrInfo) { 987 DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator I = 988 DeferredFunctionInfo.begin(); 989 while (!DeferredFunctionInfo.empty()) { 990 Function *F = (*I++).first; 991 assert(F->hasNotBeenReadFromBytecode() && 992 "Deserialized function found in map!"); 993 if (materializeFunction(F, ErrInfo)) 994 return 0; 995 } 996 return TheModule; 997} 998 999 1000/// ParseFunctionBody - Lazily parse the specified function body block. 1001bool BitcodeReader::ParseFunctionBody(Function *F) { 1002 if (Stream.EnterSubBlock()) 1003 return Error("Malformed block record"); 1004 1005 unsigned ModuleValueListSize = ValueList.size(); 1006 1007 // Add all the function arguments to the value table. 1008 for(Function::arg_iterator I = F->arg_begin(), E = F->arg_end(); I != E; ++I) 1009 ValueList.push_back(I); 1010 1011 unsigned NextValueNo = ValueList.size(); 1012 BasicBlock *CurBB = 0; 1013 unsigned CurBBNo = 0; 1014 1015 // Read all the records. 1016 SmallVector<uint64_t, 64> Record; 1017 while (1) { 1018 unsigned Code = Stream.ReadCode(); 1019 if (Code == bitc::END_BLOCK) { 1020 if (Stream.ReadBlockEnd()) 1021 return Error("Error at end of function block"); 1022 break; 1023 } 1024 1025 if (Code == bitc::ENTER_SUBBLOCK) { 1026 switch (Stream.ReadSubBlockID()) { 1027 default: // Skip unknown content. 1028 if (Stream.SkipBlock()) 1029 return Error("Malformed block record"); 1030 break; 1031 case bitc::CONSTANTS_BLOCK_ID: 1032 if (ParseConstants()) return true; 1033 NextValueNo = ValueList.size(); 1034 break; 1035 case bitc::VALUE_SYMTAB_BLOCK_ID: 1036 if (ParseValueSymbolTable()) return true; 1037 break; 1038 } 1039 continue; 1040 } 1041 1042 if (Code == bitc::DEFINE_ABBREV) { 1043 Stream.ReadAbbrevRecord(); 1044 continue; 1045 } 1046 1047 // Read a record. 1048 Record.clear(); 1049 Instruction *I = 0; 1050 switch (Stream.ReadRecord(Code, Record)) { 1051 default: // Default behavior: reject 1052 return Error("Unknown instruction"); 1053 case bitc::FUNC_CODE_DECLAREBLOCKS: // DECLAREBLOCKS: [nblocks] 1054 if (Record.size() < 1 || Record[0] == 0) 1055 return Error("Invalid DECLAREBLOCKS record"); 1056 // Create all the basic blocks for the function. 1057 FunctionBBs.resize(Record.size()); 1058 for (unsigned i = 0, e = FunctionBBs.size(); i != e; ++i) 1059 FunctionBBs[i] = new BasicBlock("", F); 1060 CurBB = FunctionBBs[0]; 1061 continue; 1062 1063 case bitc::FUNC_CODE_INST_BINOP: { // BINOP: [opcode, ty, opval, opval] 1064 if (Record.size() < 4) return Error("Invalid BINOP record"); 1065 const Type *Ty = getTypeByID(Record[1]); 1066 int Opc = GetDecodedBinaryOpcode(Record[0], Ty); 1067 Value *LHS = getFnValueByID(Record[2], Ty); 1068 Value *RHS = getFnValueByID(Record[3], Ty); 1069 if (Opc == -1 || Ty == 0 || LHS == 0 || RHS == 0) 1070 return Error("Invalid BINOP record"); 1071 I = BinaryOperator::create((Instruction::BinaryOps)Opc, LHS, RHS); 1072 break; 1073 } 1074 case bitc::FUNC_CODE_INST_CAST: { // CAST: [opcode, ty, opty, opval] 1075 if (Record.size() < 4) return Error("Invalid CAST record"); 1076 int Opc = GetDecodedCastOpcode(Record[0]); 1077 const Type *ResTy = getTypeByID(Record[1]); 1078 const Type *OpTy = getTypeByID(Record[2]); 1079 Value *Op = getFnValueByID(Record[3], OpTy); 1080 if (Opc == -1 || ResTy == 0 || OpTy == 0 || Op == 0) 1081 return Error("Invalid CAST record"); 1082 I = CastInst::create((Instruction::CastOps)Opc, Op, ResTy); 1083 break; 1084 } 1085 case bitc::FUNC_CODE_INST_GEP: { // GEP: [n, n x operands] 1086 if (Record.size() < 2 || (Record.size() & 1)) 1087 return Error("Invalid GEP record"); 1088 const Type *OpTy = getTypeByID(Record[0]); 1089 Value *Op = getFnValueByID(Record[1], OpTy); 1090 if (OpTy == 0 || Op == 0) 1091 return Error("Invalid GEP record"); 1092 1093 SmallVector<Value*, 16> GEPIdx; 1094 for (unsigned i = 1, e = Record.size()/2; i != e; ++i) { 1095 const Type *IdxTy = getTypeByID(Record[i*2]); 1096 Value *Idx = getFnValueByID(Record[i*2+1], IdxTy); 1097 if (IdxTy == 0 || Idx == 0) 1098 return Error("Invalid GEP record"); 1099 GEPIdx.push_back(Idx); 1100 } 1101 1102 I = new GetElementPtrInst(Op, &GEPIdx[0], GEPIdx.size()); 1103 break; 1104 } 1105 1106 case bitc::FUNC_CODE_INST_SELECT: { // SELECT: [ty, opval, opval, opval] 1107 if (Record.size() < 4) return Error("Invalid SELECT record"); 1108 const Type *Ty = getTypeByID(Record[0]); 1109 Value *Cond = getFnValueByID(Record[1], Type::Int1Ty); 1110 Value *LHS = getFnValueByID(Record[2], Ty); 1111 Value *RHS = getFnValueByID(Record[3], Ty); 1112 if (Ty == 0 || Cond == 0 || LHS == 0 || RHS == 0) 1113 return Error("Invalid SELECT record"); 1114 I = new SelectInst(Cond, LHS, RHS); 1115 break; 1116 } 1117 1118 case bitc::FUNC_CODE_INST_EXTRACTELT: { // EXTRACTELT: [opty, opval, opval] 1119 if (Record.size() < 3) return Error("Invalid EXTRACTELT record"); 1120 const Type *OpTy = getTypeByID(Record[0]); 1121 Value *Vec = getFnValueByID(Record[1], OpTy); 1122 Value *Idx = getFnValueByID(Record[2], Type::Int32Ty); 1123 if (OpTy == 0 || Vec == 0 || Idx == 0) 1124 return Error("Invalid EXTRACTELT record"); 1125 I = new ExtractElementInst(Vec, Idx); 1126 break; 1127 } 1128 1129 case bitc::FUNC_CODE_INST_INSERTELT: { // INSERTELT: [ty, opval,opval,opval] 1130 if (Record.size() < 4) return Error("Invalid INSERTELT record"); 1131 const VectorType *OpTy = 1132 dyn_cast_or_null<VectorType>(getTypeByID(Record[0])); 1133 if (OpTy == 0) return Error("Invalid INSERTELT record"); 1134 Value *Vec = getFnValueByID(Record[1], OpTy); 1135 Value *Elt = getFnValueByID(Record[2], OpTy->getElementType()); 1136 Value *Idx = getFnValueByID(Record[3], Type::Int32Ty); 1137 if (Vec == 0 || Elt == 0 || Idx == 0) 1138 return Error("Invalid INSERTELT record"); 1139 I = new InsertElementInst(Vec, Elt, Idx); 1140 break; 1141 } 1142 1143 case bitc::FUNC_CODE_INST_SHUFFLEVEC: {// SHUFFLEVEC: [ty,opval,opval,opval] 1144 if (Record.size() < 4) return Error("Invalid SHUFFLEVEC record"); 1145 const VectorType *OpTy = 1146 dyn_cast_or_null<VectorType>(getTypeByID(Record[0])); 1147 if (OpTy == 0) return Error("Invalid SHUFFLEVEC record"); 1148 Value *Vec1 = getFnValueByID(Record[1], OpTy); 1149 Value *Vec2 = getFnValueByID(Record[2], OpTy); 1150 Value *Mask = getFnValueByID(Record[3], 1151 VectorType::get(Type::Int32Ty, 1152 OpTy->getNumElements())); 1153 if (Vec1 == 0 || Vec2 == 0 || Mask == 0) 1154 return Error("Invalid SHUFFLEVEC record"); 1155 I = new ShuffleVectorInst(Vec1, Vec2, Mask); 1156 break; 1157 } 1158 1159 case bitc::FUNC_CODE_INST_CMP: { // CMP: [opty, opval, opval, pred] 1160 if (Record.size() < 4) return Error("Invalid CMP record"); 1161 const Type *OpTy = getTypeByID(Record[0]); 1162 Value *LHS = getFnValueByID(Record[1], OpTy); 1163 Value *RHS = getFnValueByID(Record[2], OpTy); 1164 if (OpTy == 0 || LHS == 0 || RHS == 0) 1165 return Error("Invalid CMP record"); 1166 if (OpTy->isFPOrFPVector()) 1167 I = new FCmpInst((FCmpInst::Predicate)Record[3], LHS, RHS); 1168 else 1169 I = new ICmpInst((ICmpInst::Predicate)Record[3], LHS, RHS); 1170 break; 1171 } 1172 1173 case bitc::FUNC_CODE_INST_RET: // RET: [opty,opval<optional>] 1174 if (Record.size() == 0) { 1175 I = new ReturnInst(); 1176 break; 1177 } 1178 if (Record.size() == 2) { 1179 const Type *OpTy = getTypeByID(Record[0]); 1180 Value *Op = getFnValueByID(Record[1], OpTy); 1181 if (!OpTy || !Op) 1182 return Error("Invalid RET record"); 1183 I = new ReturnInst(Op); 1184 break; 1185 } 1186 return Error("Invalid RET record"); 1187 case bitc::FUNC_CODE_INST_BR: { // BR: [bb#, bb#, opval] or [bb#] 1188 if (Record.size() != 1 || Record.size() != 3) 1189 return Error("Invalid BR record"); 1190 BasicBlock *TrueDest = getBasicBlock(Record[0]); 1191 if (TrueDest == 0) 1192 return Error("Invalid BR record"); 1193 1194 if (Record.size() == 1) 1195 I = new BranchInst(TrueDest); 1196 else { 1197 BasicBlock *FalseDest = getBasicBlock(Record[1]); 1198 Value *Cond = getFnValueByID(Record[2], Type::Int1Ty); 1199 if (FalseDest == 0 || Cond == 0) 1200 return Error("Invalid BR record"); 1201 I = new BranchInst(TrueDest, FalseDest, Cond); 1202 } 1203 break; 1204 } 1205 case bitc::FUNC_CODE_INST_SWITCH: { // SWITCH: [opty, opval, n, n x ops] 1206 if (Record.size() < 3 || (Record.size() & 1) == 0) 1207 return Error("Invalid SWITCH record"); 1208 const Type *OpTy = getTypeByID(Record[0]); 1209 Value *Cond = getFnValueByID(Record[1], OpTy); 1210 BasicBlock *Default = getBasicBlock(Record[2]); 1211 if (OpTy == 0 || Cond == 0 || Default == 0) 1212 return Error("Invalid SWITCH record"); 1213 unsigned NumCases = (Record.size()-3)/2; 1214 SwitchInst *SI = new SwitchInst(Cond, Default, NumCases); 1215 for (unsigned i = 0, e = NumCases; i != e; ++i) { 1216 ConstantInt *CaseVal = 1217 dyn_cast_or_null<ConstantInt>(getFnValueByID(Record[3+i*2], OpTy)); 1218 BasicBlock *DestBB = getBasicBlock(Record[1+3+i*2]); 1219 if (CaseVal == 0 || DestBB == 0) { 1220 delete SI; 1221 return Error("Invalid SWITCH record!"); 1222 } 1223 SI->addCase(CaseVal, DestBB); 1224 } 1225 I = SI; 1226 break; 1227 } 1228 1229 case bitc::FUNC_CODE_INST_INVOKE: { // INVOKE: [fnty, op0,op1,op2, ...] 1230 if (Record.size() < 4) 1231 return Error("Invalid INVOKE record"); 1232 const PointerType *CalleeTy = 1233 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1234 Value *Callee = getFnValueByID(Record[1], CalleeTy); 1235 BasicBlock *NormalBB = getBasicBlock(Record[2]); 1236 BasicBlock *UnwindBB = getBasicBlock(Record[3]); 1237 if (CalleeTy == 0 || Callee == 0 || NormalBB == 0 || UnwindBB == 0) 1238 return Error("Invalid INVOKE record"); 1239 1240 const FunctionType *FTy = 1241 dyn_cast<FunctionType>(CalleeTy->getElementType()); 1242 1243 // Check that the right number of fixed parameters are here. 1244 if (FTy == 0 || Record.size() < 4+FTy->getNumParams()) 1245 return Error("Invalid INVOKE record"); 1246 1247 SmallVector<Value*, 16> Ops; 1248 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) { 1249 Ops.push_back(getFnValueByID(Record[4+i], FTy->getParamType(4+i))); 1250 if (Ops.back() == 0) 1251 return Error("Invalid INVOKE record"); 1252 } 1253 1254 unsigned FirstVarargParam = 4+FTy->getNumParams(); 1255 if (FTy->isVarArg()) { 1256 // Read type/value pairs for varargs params. 1257 if ((Record.size()-FirstVarargParam) & 1) 1258 return Error("Invalid INVOKE record"); 1259 1260 for (unsigned i = FirstVarargParam, e = Record.size(); i != e; i += 2) { 1261 const Type *ArgTy = getTypeByID(Record[i]); 1262 Ops.push_back(getFnValueByID(Record[i+1], ArgTy)); 1263 if (Ops.back() == 0 || ArgTy == 0) 1264 return Error("Invalid INVOKE record"); 1265 } 1266 } else { 1267 if (Record.size() != FirstVarargParam) 1268 return Error("Invalid INVOKE record"); 1269 } 1270 1271 I = new InvokeInst(Callee, NormalBB, UnwindBB, &Ops[0], Ops.size()); 1272 break; 1273 } 1274 case bitc::FUNC_CODE_INST_UNWIND: // UNWIND 1275 I = new UnwindInst(); 1276 break; 1277 case bitc::FUNC_CODE_INST_UNREACHABLE: // UNREACHABLE 1278 I = new UnreachableInst(); 1279 break; 1280 case bitc::FUNC_CODE_INST_PHI: { // PHI: [ty, #ops, val0,bb0, ...] 1281 if (Record.size() < 2 || Record.size() < 2+Record[1] || (Record[1]&1)) 1282 return Error("Invalid PHI record"); 1283 const Type *Ty = getTypeByID(Record[0]); 1284 if (!Ty) return Error("Invalid PHI record"); 1285 1286 PHINode *PN = new PHINode(Ty); 1287 PN->reserveOperandSpace(Record[1]); 1288 1289 for (unsigned i = 0, e = Record[1]; i != e; i += 2) { 1290 Value *V = getFnValueByID(Record[2+i], Ty); 1291 BasicBlock *BB = getBasicBlock(Record[3+i]); 1292 if (!V || !BB) return Error("Invalid PHI record"); 1293 PN->addIncoming(V, BB); 1294 } 1295 I = PN; 1296 break; 1297 } 1298 1299 case bitc::FUNC_CODE_INST_MALLOC: { // MALLOC: [instty, op, align] 1300 if (Record.size() < 3) 1301 return Error("Invalid MALLOC record"); 1302 const PointerType *Ty = 1303 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1304 Value *Size = getFnValueByID(Record[1], Type::Int32Ty); 1305 unsigned Align = Record[2]; 1306 if (!Ty || !Size) return Error("Invalid MALLOC record"); 1307 I = new MallocInst(Ty->getElementType(), Size, (1 << Align) >> 1); 1308 break; 1309 } 1310 case bitc::FUNC_CODE_INST_FREE: { // FREE: [opty, op] 1311 if (Record.size() < 2) 1312 return Error("Invalid FREE record"); 1313 const Type *OpTy = getTypeByID(Record[0]); 1314 Value *Op = getFnValueByID(Record[1], OpTy); 1315 if (!OpTy || !Op) 1316 return Error("Invalid FREE record"); 1317 I = new FreeInst(Op); 1318 break; 1319 } 1320 case bitc::FUNC_CODE_INST_ALLOCA: { // ALLOCA: [instty, op, align] 1321 if (Record.size() < 3) 1322 return Error("Invalid ALLOCA record"); 1323 const PointerType *Ty = 1324 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1325 Value *Size = getFnValueByID(Record[1], Type::Int32Ty); 1326 unsigned Align = Record[2]; 1327 if (!Ty || !Size) return Error("Invalid ALLOCA record"); 1328 I = new AllocaInst(Ty->getElementType(), Size, (1 << Align) >> 1); 1329 break; 1330 } 1331 case bitc::FUNC_CODE_INST_LOAD: { // LOAD: [opty, op, align, vol] 1332 if (Record.size() < 4) 1333 return Error("Invalid LOAD record"); 1334 const Type *OpTy = getTypeByID(Record[0]); 1335 Value *Op = getFnValueByID(Record[1], OpTy); 1336 if (!OpTy || !Op) 1337 return Error("Invalid LOAD record"); 1338 I = new LoadInst(Op, "", Record[3], (1 << Record[2]) >> 1); 1339 break; 1340 } 1341 case bitc::FUNC_CODE_INST_STORE: { // STORE:[ptrty,val,ptr, align, vol] 1342 if (Record.size() < 5) 1343 return Error("Invalid LOAD record"); 1344 const Type *OpTy = getTypeByID(Record[0]); 1345 Value *Op = getFnValueByID(Record[1], OpTy); 1346 Value *Ptr = getFnValueByID(Record[2], PointerType::get(OpTy)); 1347 if (!OpTy || !Op || !Ptr) 1348 return Error("Invalid STORE record"); 1349 I = new StoreInst(Op, Ptr, (1 << Record[3]) >> 1, Record[4]); 1350 break; 1351 } 1352 case bitc::FUNC_CODE_INST_CALL: { // CALL: [fnty, fnid, arg0, arg1...] 1353 if (Record.size() < 2) 1354 return Error("Invalid CALL record"); 1355 const PointerType *OpTy = 1356 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1357 const FunctionType *FTy = 0; 1358 if (OpTy) FTy = dyn_cast<FunctionType>(OpTy->getElementType()); 1359 Value *Callee = getFnValueByID(Record[1], OpTy); 1360 if (!FTy || !Callee || Record.size() < FTy->getNumParams()+2) 1361 return Error("Invalid CALL record"); 1362 1363 SmallVector<Value*, 16> Args; 1364 // Read the fixed params. 1365 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i) { 1366 Args.push_back(getFnValueByID(Record[i+2], FTy->getParamType(i))); 1367 if (Args.back() == 0) return Error("Invalid CALL record"); 1368 } 1369 1370 1371 // Read type/value pairs for varargs params. 1372 unsigned NextArg = FTy->getNumParams()+2; 1373 if (!FTy->isVarArg()) { 1374 if (NextArg != Record.size()) 1375 return Error("Invalid CALL record"); 1376 } else { 1377 if ((Record.size()-NextArg) & 1) 1378 return Error("Invalid CALL record"); 1379 for (unsigned e = Record.size(); NextArg != e; NextArg += 2) { 1380 Args.push_back(getFnValueByID(Record[NextArg+1], 1381 getTypeByID(Record[NextArg]))); 1382 if (Args.back() == 0) return Error("Invalid CALL record"); 1383 } 1384 } 1385 1386 I = new CallInst(Callee, &Args[0], Args.size()); 1387 break; 1388 } 1389 case bitc::FUNC_CODE_INST_VAARG: { // VAARG: [valistty, valist, instty] 1390 if (Record.size() < 3) 1391 return Error("Invalid VAARG record"); 1392 const Type *OpTy = getTypeByID(Record[0]); 1393 Value *Op = getFnValueByID(Record[1], OpTy); 1394 const Type *ResTy = getTypeByID(Record[2]); 1395 if (!OpTy || !Op || !ResTy) 1396 return Error("Invalid VAARG record"); 1397 I = new VAArgInst(Op, ResTy); 1398 break; 1399 } 1400 } 1401 1402 // Add instruction to end of current BB. If there is no current BB, reject 1403 // this file. 1404 if (CurBB == 0) { 1405 delete I; 1406 return Error("Invalid instruction with no BB"); 1407 } 1408 CurBB->getInstList().push_back(I); 1409 1410 // If this was a terminator instruction, move to the next block. 1411 if (isa<TerminatorInst>(I)) { 1412 ++CurBBNo; 1413 CurBB = CurBBNo < FunctionBBs.size() ? FunctionBBs[CurBBNo] : 0; 1414 } 1415 1416 // Non-void values get registered in the value table for future use. 1417 if (I && I->getType() != Type::VoidTy) 1418 ValueList.AssignValue(I, NextValueNo++); 1419 } 1420 1421 // Check the function list for unresolved values. 1422 if (Argument *A = dyn_cast<Argument>(ValueList.back())) { 1423 if (A->getParent() == 0) { 1424 // We found at least one unresolved value. Nuke them all to avoid leaks. 1425 for (unsigned i = ModuleValueListSize, e = ValueList.size(); i != e; ++i){ 1426 if ((A = dyn_cast<Argument>(ValueList.back())) && A->getParent() == 0) { 1427 A->replaceAllUsesWith(UndefValue::get(A->getType())); 1428 delete A; 1429 } 1430 } 1431 } 1432 return Error("Never resolved value found in function!"); 1433 } 1434 1435 // Trim the value list down to the size it was before we parsed this function. 1436 ValueList.shrinkTo(ModuleValueListSize); 1437 std::vector<BasicBlock*>().swap(FunctionBBs); 1438 1439 return false; 1440} 1441 1442 1443//===----------------------------------------------------------------------===// 1444// External interface 1445//===----------------------------------------------------------------------===// 1446 1447/// getBitcodeModuleProvider - lazy function-at-a-time loading from a file. 1448/// 1449ModuleProvider *llvm::getBitcodeModuleProvider(MemoryBuffer *Buffer, 1450 std::string *ErrMsg) { 1451 BitcodeReader *R = new BitcodeReader(Buffer); 1452 if (R->ParseBitcode()) { 1453 if (ErrMsg) 1454 *ErrMsg = R->getErrorString(); 1455 1456 // Don't let the BitcodeReader dtor delete 'Buffer'. 1457 R->releaseMemoryBuffer(); 1458 delete R; 1459 return 0; 1460 } 1461 return R; 1462} 1463 1464/// ParseBitcodeFile - Read the specified bitcode file, returning the module. 1465/// If an error occurs, return null and fill in *ErrMsg if non-null. 1466Module *llvm::ParseBitcodeFile(MemoryBuffer *Buffer, std::string *ErrMsg){ 1467 BitcodeReader *R; 1468 R = static_cast<BitcodeReader*>(getBitcodeModuleProvider(Buffer, ErrMsg)); 1469 if (!R) return 0; 1470 1471 // Read the whole module, get a pointer to it, tell ModuleProvider not to 1472 // delete it when its dtor is run. 1473 Module *M = R->releaseModule(ErrMsg); 1474 1475 // Don't let the BitcodeReader dtor delete 'Buffer'. 1476 R->releaseMemoryBuffer(); 1477 delete R; 1478 return M; 1479} 1480