BitcodeReader.cpp revision c0ff8c85dcc0bb3c58c15890b180dedaa726cb76
1//===- BitcodeReader.cpp - Internal BitcodeReader implementation ----------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// 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/IntrinsicInst.h" 20#include "llvm/LLVMContext.h" 21#include "llvm/Metadata.h" 22#include "llvm/Module.h" 23#include "llvm/Operator.h" 24#include "llvm/AutoUpgrade.h" 25#include "llvm/ADT/SmallString.h" 26#include "llvm/ADT/SmallVector.h" 27#include "llvm/Support/MathExtras.h" 28#include "llvm/Support/MemoryBuffer.h" 29#include "llvm/OperandTraits.h" 30using namespace llvm; 31 32void BitcodeReader::FreeState() { 33 delete Buffer; 34 Buffer = 0; 35 std::vector<PATypeHolder>().swap(TypeList); 36 ValueList.clear(); 37 MDValueList.clear(); 38 39 std::vector<AttrListPtr>().swap(MAttributes); 40 std::vector<BasicBlock*>().swap(FunctionBBs); 41 std::vector<Function*>().swap(FunctionsWithBodies); 42 DeferredFunctionInfo.clear(); 43} 44 45//===----------------------------------------------------------------------===// 46// Helper functions to implement forward reference resolution, etc. 47//===----------------------------------------------------------------------===// 48 49/// ConvertToString - Convert a string from a record into an std::string, return 50/// true on failure. 51template<typename StrTy> 52static bool ConvertToString(SmallVector<uint64_t, 64> &Record, unsigned Idx, 53 StrTy &Result) { 54 if (Idx > Record.size()) 55 return true; 56 57 for (unsigned i = Idx, e = Record.size(); i != e; ++i) 58 Result += (char)Record[i]; 59 return false; 60} 61 62static GlobalValue::LinkageTypes GetDecodedLinkage(unsigned Val) { 63 switch (Val) { 64 default: // Map unknown/new linkages to external 65 case 0: return GlobalValue::ExternalLinkage; 66 case 1: return GlobalValue::WeakAnyLinkage; 67 case 2: return GlobalValue::AppendingLinkage; 68 case 3: return GlobalValue::InternalLinkage; 69 case 4: return GlobalValue::LinkOnceAnyLinkage; 70 case 5: return GlobalValue::DLLImportLinkage; 71 case 6: return GlobalValue::DLLExportLinkage; 72 case 7: return GlobalValue::ExternalWeakLinkage; 73 case 8: return GlobalValue::CommonLinkage; 74 case 9: return GlobalValue::PrivateLinkage; 75 case 10: return GlobalValue::WeakODRLinkage; 76 case 11: return GlobalValue::LinkOnceODRLinkage; 77 case 12: return GlobalValue::AvailableExternallyLinkage; 78 case 13: return GlobalValue::LinkerPrivateLinkage; 79 } 80} 81 82static GlobalValue::VisibilityTypes GetDecodedVisibility(unsigned Val) { 83 switch (Val) { 84 default: // Map unknown visibilities to default. 85 case 0: return GlobalValue::DefaultVisibility; 86 case 1: return GlobalValue::HiddenVisibility; 87 case 2: return GlobalValue::ProtectedVisibility; 88 } 89} 90 91static int GetDecodedCastOpcode(unsigned Val) { 92 switch (Val) { 93 default: return -1; 94 case bitc::CAST_TRUNC : return Instruction::Trunc; 95 case bitc::CAST_ZEXT : return Instruction::ZExt; 96 case bitc::CAST_SEXT : return Instruction::SExt; 97 case bitc::CAST_FPTOUI : return Instruction::FPToUI; 98 case bitc::CAST_FPTOSI : return Instruction::FPToSI; 99 case bitc::CAST_UITOFP : return Instruction::UIToFP; 100 case bitc::CAST_SITOFP : return Instruction::SIToFP; 101 case bitc::CAST_FPTRUNC : return Instruction::FPTrunc; 102 case bitc::CAST_FPEXT : return Instruction::FPExt; 103 case bitc::CAST_PTRTOINT: return Instruction::PtrToInt; 104 case bitc::CAST_INTTOPTR: return Instruction::IntToPtr; 105 case bitc::CAST_BITCAST : return Instruction::BitCast; 106 } 107} 108static int GetDecodedBinaryOpcode(unsigned Val, const Type *Ty) { 109 switch (Val) { 110 default: return -1; 111 case bitc::BINOP_ADD: 112 return Ty->isFPOrFPVector() ? Instruction::FAdd : Instruction::Add; 113 case bitc::BINOP_SUB: 114 return Ty->isFPOrFPVector() ? Instruction::FSub : Instruction::Sub; 115 case bitc::BINOP_MUL: 116 return Ty->isFPOrFPVector() ? Instruction::FMul : Instruction::Mul; 117 case bitc::BINOP_UDIV: return Instruction::UDiv; 118 case bitc::BINOP_SDIV: 119 return Ty->isFPOrFPVector() ? Instruction::FDiv : Instruction::SDiv; 120 case bitc::BINOP_UREM: return Instruction::URem; 121 case bitc::BINOP_SREM: 122 return Ty->isFPOrFPVector() ? Instruction::FRem : Instruction::SRem; 123 case bitc::BINOP_SHL: return Instruction::Shl; 124 case bitc::BINOP_LSHR: return Instruction::LShr; 125 case bitc::BINOP_ASHR: return Instruction::AShr; 126 case bitc::BINOP_AND: return Instruction::And; 127 case bitc::BINOP_OR: return Instruction::Or; 128 case bitc::BINOP_XOR: return Instruction::Xor; 129 } 130} 131 132namespace llvm { 133namespace { 134 /// @brief A class for maintaining the slot number definition 135 /// as a placeholder for the actual definition for forward constants defs. 136 class ConstantPlaceHolder : public ConstantExpr { 137 ConstantPlaceHolder(); // DO NOT IMPLEMENT 138 void operator=(const ConstantPlaceHolder &); // DO NOT IMPLEMENT 139 public: 140 // allocate space for exactly one operand 141 void *operator new(size_t s) { 142 return User::operator new(s, 1); 143 } 144 explicit ConstantPlaceHolder(const Type *Ty, LLVMContext& Context) 145 : ConstantExpr(Ty, Instruction::UserOp1, &Op<0>(), 1) { 146 Op<0>() = UndefValue::get(Type::getInt32Ty(Context)); 147 } 148 149 /// @brief Methods to support type inquiry through isa, cast, and dyn_cast. 150 static inline bool classof(const ConstantPlaceHolder *) { return true; } 151 static bool classof(const Value *V) { 152 return isa<ConstantExpr>(V) && 153 cast<ConstantExpr>(V)->getOpcode() == Instruction::UserOp1; 154 } 155 156 157 /// Provide fast operand accessors 158 //DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value); 159 }; 160} 161 162// FIXME: can we inherit this from ConstantExpr? 163template <> 164struct OperandTraits<ConstantPlaceHolder> : FixedNumOperandTraits<1> { 165}; 166} 167 168 169void BitcodeReaderValueList::AssignValue(Value *V, unsigned Idx) { 170 if (Idx == size()) { 171 push_back(V); 172 return; 173 } 174 175 if (Idx >= size()) 176 resize(Idx+1); 177 178 WeakVH &OldV = ValuePtrs[Idx]; 179 if (OldV == 0) { 180 OldV = V; 181 return; 182 } 183 184 // Handle constants and non-constants (e.g. instrs) differently for 185 // efficiency. 186 if (Constant *PHC = dyn_cast<Constant>(&*OldV)) { 187 ResolveConstants.push_back(std::make_pair(PHC, Idx)); 188 OldV = V; 189 } else { 190 // If there was a forward reference to this value, replace it. 191 Value *PrevVal = OldV; 192 OldV->replaceAllUsesWith(V); 193 delete PrevVal; 194 } 195} 196 197 198Constant *BitcodeReaderValueList::getConstantFwdRef(unsigned Idx, 199 const Type *Ty) { 200 if (Idx >= size()) 201 resize(Idx + 1); 202 203 if (Value *V = ValuePtrs[Idx]) { 204 assert(Ty == V->getType() && "Type mismatch in constant table!"); 205 return cast<Constant>(V); 206 } 207 208 // Create and return a placeholder, which will later be RAUW'd. 209 Constant *C = new ConstantPlaceHolder(Ty, Context); 210 ValuePtrs[Idx] = C; 211 return C; 212} 213 214Value *BitcodeReaderValueList::getValueFwdRef(unsigned Idx, const Type *Ty) { 215 if (Idx >= size()) 216 resize(Idx + 1); 217 218 if (Value *V = ValuePtrs[Idx]) { 219 assert((Ty == 0 || Ty == V->getType()) && "Type mismatch in value table!"); 220 return V; 221 } 222 223 // No type specified, must be invalid reference. 224 if (Ty == 0) return 0; 225 226 // Create and return a placeholder, which will later be RAUW'd. 227 Value *V = new Argument(Ty); 228 ValuePtrs[Idx] = V; 229 return V; 230} 231 232/// ResolveConstantForwardRefs - Once all constants are read, this method bulk 233/// resolves any forward references. The idea behind this is that we sometimes 234/// get constants (such as large arrays) which reference *many* forward ref 235/// constants. Replacing each of these causes a lot of thrashing when 236/// building/reuniquing the constant. Instead of doing this, we look at all the 237/// uses and rewrite all the place holders at once for any constant that uses 238/// a placeholder. 239void BitcodeReaderValueList::ResolveConstantForwardRefs() { 240 // Sort the values by-pointer so that they are efficient to look up with a 241 // binary search. 242 std::sort(ResolveConstants.begin(), ResolveConstants.end()); 243 244 SmallVector<Constant*, 64> NewOps; 245 246 while (!ResolveConstants.empty()) { 247 Value *RealVal = operator[](ResolveConstants.back().second); 248 Constant *Placeholder = ResolveConstants.back().first; 249 ResolveConstants.pop_back(); 250 251 // Loop over all users of the placeholder, updating them to reference the 252 // new value. If they reference more than one placeholder, update them all 253 // at once. 254 while (!Placeholder->use_empty()) { 255 Value::use_iterator UI = Placeholder->use_begin(); 256 257 // If the using object isn't uniqued, just update the operands. This 258 // handles instructions and initializers for global variables. 259 if (!isa<Constant>(*UI) || isa<GlobalValue>(*UI)) { 260 UI.getUse().set(RealVal); 261 continue; 262 } 263 264 // Otherwise, we have a constant that uses the placeholder. Replace that 265 // constant with a new constant that has *all* placeholder uses updated. 266 Constant *UserC = cast<Constant>(*UI); 267 for (User::op_iterator I = UserC->op_begin(), E = UserC->op_end(); 268 I != E; ++I) { 269 Value *NewOp; 270 if (!isa<ConstantPlaceHolder>(*I)) { 271 // Not a placeholder reference. 272 NewOp = *I; 273 } else if (*I == Placeholder) { 274 // Common case is that it just references this one placeholder. 275 NewOp = RealVal; 276 } else { 277 // Otherwise, look up the placeholder in ResolveConstants. 278 ResolveConstantsTy::iterator It = 279 std::lower_bound(ResolveConstants.begin(), ResolveConstants.end(), 280 std::pair<Constant*, unsigned>(cast<Constant>(*I), 281 0)); 282 assert(It != ResolveConstants.end() && It->first == *I); 283 NewOp = operator[](It->second); 284 } 285 286 NewOps.push_back(cast<Constant>(NewOp)); 287 } 288 289 // Make the new constant. 290 Constant *NewC; 291 if (ConstantArray *UserCA = dyn_cast<ConstantArray>(UserC)) { 292 NewC = ConstantArray::get(UserCA->getType(), &NewOps[0], 293 NewOps.size()); 294 } else if (ConstantStruct *UserCS = dyn_cast<ConstantStruct>(UserC)) { 295 NewC = ConstantStruct::get(Context, &NewOps[0], NewOps.size(), 296 UserCS->getType()->isPacked()); 297 } else if (isa<ConstantVector>(UserC)) { 298 NewC = ConstantVector::get(&NewOps[0], NewOps.size()); 299 } else { 300 assert(isa<ConstantExpr>(UserC) && "Must be a ConstantExpr."); 301 NewC = cast<ConstantExpr>(UserC)->getWithOperands(&NewOps[0], 302 NewOps.size()); 303 } 304 305 UserC->replaceAllUsesWith(NewC); 306 UserC->destroyConstant(); 307 NewOps.clear(); 308 } 309 310 // Update all ValueHandles, they should be the only users at this point. 311 Placeholder->replaceAllUsesWith(RealVal); 312 delete Placeholder; 313 } 314} 315 316void BitcodeReaderMDValueList::AssignValue(Value *V, unsigned Idx) { 317 if (Idx == size()) { 318 push_back(V); 319 return; 320 } 321 322 if (Idx >= size()) 323 resize(Idx+1); 324 325 WeakVH &OldV = MDValuePtrs[Idx]; 326 if (OldV == 0) { 327 OldV = V; 328 return; 329 } 330 331 // If there was a forward reference to this value, replace it. 332 Value *PrevVal = OldV; 333 OldV->replaceAllUsesWith(V); 334 delete PrevVal; 335 // Deleting PrevVal sets Idx value in MDValuePtrs to null. Set new 336 // value for Idx. 337 MDValuePtrs[Idx] = V; 338} 339 340Value *BitcodeReaderMDValueList::getValueFwdRef(unsigned Idx) { 341 if (Idx >= size()) 342 resize(Idx + 1); 343 344 if (Value *V = MDValuePtrs[Idx]) { 345 assert(V->getType() == Type::getMetadataTy(Context) && "Type mismatch in value table!"); 346 return V; 347 } 348 349 // Create and return a placeholder, which will later be RAUW'd. 350 Value *V = new Argument(Type::getMetadataTy(Context)); 351 MDValuePtrs[Idx] = V; 352 return V; 353} 354 355const Type *BitcodeReader::getTypeByID(unsigned ID, bool isTypeTable) { 356 // If the TypeID is in range, return it. 357 if (ID < TypeList.size()) 358 return TypeList[ID].get(); 359 if (!isTypeTable) return 0; 360 361 // The type table allows forward references. Push as many Opaque types as 362 // needed to get up to ID. 363 while (TypeList.size() <= ID) 364 TypeList.push_back(OpaqueType::get(Context)); 365 return TypeList.back().get(); 366} 367 368//===----------------------------------------------------------------------===// 369// Functions for parsing blocks from the bitcode file 370//===----------------------------------------------------------------------===// 371 372bool BitcodeReader::ParseAttributeBlock() { 373 if (Stream.EnterSubBlock(bitc::PARAMATTR_BLOCK_ID)) 374 return Error("Malformed block record"); 375 376 if (!MAttributes.empty()) 377 return Error("Multiple PARAMATTR blocks found!"); 378 379 SmallVector<uint64_t, 64> Record; 380 381 SmallVector<AttributeWithIndex, 8> Attrs; 382 383 // Read all the records. 384 while (1) { 385 unsigned Code = Stream.ReadCode(); 386 if (Code == bitc::END_BLOCK) { 387 if (Stream.ReadBlockEnd()) 388 return Error("Error at end of PARAMATTR block"); 389 return false; 390 } 391 392 if (Code == bitc::ENTER_SUBBLOCK) { 393 // No known subblocks, always skip them. 394 Stream.ReadSubBlockID(); 395 if (Stream.SkipBlock()) 396 return Error("Malformed block record"); 397 continue; 398 } 399 400 if (Code == bitc::DEFINE_ABBREV) { 401 Stream.ReadAbbrevRecord(); 402 continue; 403 } 404 405 // Read a record. 406 Record.clear(); 407 switch (Stream.ReadRecord(Code, Record)) { 408 default: // Default behavior: ignore. 409 break; 410 case bitc::PARAMATTR_CODE_ENTRY: { // ENTRY: [paramidx0, attr0, ...] 411 if (Record.size() & 1) 412 return Error("Invalid ENTRY record"); 413 414 // FIXME : Remove this autoupgrade code in LLVM 3.0. 415 // If Function attributes are using index 0 then transfer them 416 // to index ~0. Index 0 is used for return value attributes but used to be 417 // used for function attributes. 418 Attributes RetAttribute = Attribute::None; 419 Attributes FnAttribute = Attribute::None; 420 for (unsigned i = 0, e = Record.size(); i != e; i += 2) { 421 // FIXME: remove in LLVM 3.0 422 // The alignment is stored as a 16-bit raw value from bits 31--16. 423 // We shift the bits above 31 down by 11 bits. 424 425 unsigned Alignment = (Record[i+1] & (0xffffull << 16)) >> 16; 426 if (Alignment && !isPowerOf2_32(Alignment)) 427 return Error("Alignment is not a power of two."); 428 429 Attributes ReconstitutedAttr = Record[i+1] & 0xffff; 430 if (Alignment) 431 ReconstitutedAttr |= Attribute::constructAlignmentFromInt(Alignment); 432 ReconstitutedAttr |= (Record[i+1] & (0xffffull << 32)) >> 11; 433 Record[i+1] = ReconstitutedAttr; 434 435 if (Record[i] == 0) 436 RetAttribute = Record[i+1]; 437 else if (Record[i] == ~0U) 438 FnAttribute = Record[i+1]; 439 } 440 441 unsigned OldRetAttrs = (Attribute::NoUnwind|Attribute::NoReturn| 442 Attribute::ReadOnly|Attribute::ReadNone); 443 444 if (FnAttribute == Attribute::None && RetAttribute != Attribute::None && 445 (RetAttribute & OldRetAttrs) != 0) { 446 if (FnAttribute == Attribute::None) { // add a slot so they get added. 447 Record.push_back(~0U); 448 Record.push_back(0); 449 } 450 451 FnAttribute |= RetAttribute & OldRetAttrs; 452 RetAttribute &= ~OldRetAttrs; 453 } 454 455 for (unsigned i = 0, e = Record.size(); i != e; i += 2) { 456 if (Record[i] == 0) { 457 if (RetAttribute != Attribute::None) 458 Attrs.push_back(AttributeWithIndex::get(0, RetAttribute)); 459 } else if (Record[i] == ~0U) { 460 if (FnAttribute != Attribute::None) 461 Attrs.push_back(AttributeWithIndex::get(~0U, FnAttribute)); 462 } else if (Record[i+1] != Attribute::None) 463 Attrs.push_back(AttributeWithIndex::get(Record[i], Record[i+1])); 464 } 465 466 MAttributes.push_back(AttrListPtr::get(Attrs.begin(), Attrs.end())); 467 Attrs.clear(); 468 break; 469 } 470 } 471 } 472} 473 474 475bool BitcodeReader::ParseTypeTable() { 476 if (Stream.EnterSubBlock(bitc::TYPE_BLOCK_ID)) 477 return Error("Malformed block record"); 478 479 if (!TypeList.empty()) 480 return Error("Multiple TYPE_BLOCKs found!"); 481 482 SmallVector<uint64_t, 64> Record; 483 unsigned NumRecords = 0; 484 485 // Read all the records for this type table. 486 while (1) { 487 unsigned Code = Stream.ReadCode(); 488 if (Code == bitc::END_BLOCK) { 489 if (NumRecords != TypeList.size()) 490 return Error("Invalid type forward reference in TYPE_BLOCK"); 491 if (Stream.ReadBlockEnd()) 492 return Error("Error at end of type table block"); 493 return false; 494 } 495 496 if (Code == bitc::ENTER_SUBBLOCK) { 497 // No known subblocks, always skip them. 498 Stream.ReadSubBlockID(); 499 if (Stream.SkipBlock()) 500 return Error("Malformed block record"); 501 continue; 502 } 503 504 if (Code == bitc::DEFINE_ABBREV) { 505 Stream.ReadAbbrevRecord(); 506 continue; 507 } 508 509 // Read a record. 510 Record.clear(); 511 const Type *ResultTy = 0; 512 switch (Stream.ReadRecord(Code, Record)) { 513 default: // Default behavior: unknown type. 514 ResultTy = 0; 515 break; 516 case bitc::TYPE_CODE_NUMENTRY: // TYPE_CODE_NUMENTRY: [numentries] 517 // TYPE_CODE_NUMENTRY contains a count of the number of types in the 518 // type list. This allows us to reserve space. 519 if (Record.size() < 1) 520 return Error("Invalid TYPE_CODE_NUMENTRY record"); 521 TypeList.reserve(Record[0]); 522 continue; 523 case bitc::TYPE_CODE_VOID: // VOID 524 ResultTy = Type::getVoidTy(Context); 525 break; 526 case bitc::TYPE_CODE_FLOAT: // FLOAT 527 ResultTy = Type::getFloatTy(Context); 528 break; 529 case bitc::TYPE_CODE_DOUBLE: // DOUBLE 530 ResultTy = Type::getDoubleTy(Context); 531 break; 532 case bitc::TYPE_CODE_X86_FP80: // X86_FP80 533 ResultTy = Type::getX86_FP80Ty(Context); 534 break; 535 case bitc::TYPE_CODE_FP128: // FP128 536 ResultTy = Type::getFP128Ty(Context); 537 break; 538 case bitc::TYPE_CODE_PPC_FP128: // PPC_FP128 539 ResultTy = Type::getPPC_FP128Ty(Context); 540 break; 541 case bitc::TYPE_CODE_LABEL: // LABEL 542 ResultTy = Type::getLabelTy(Context); 543 break; 544 case bitc::TYPE_CODE_OPAQUE: // OPAQUE 545 ResultTy = 0; 546 break; 547 case bitc::TYPE_CODE_METADATA: // METADATA 548 ResultTy = Type::getMetadataTy(Context); 549 break; 550 case bitc::TYPE_CODE_INTEGER: // INTEGER: [width] 551 if (Record.size() < 1) 552 return Error("Invalid Integer type record"); 553 554 ResultTy = IntegerType::get(Context, Record[0]); 555 break; 556 case bitc::TYPE_CODE_POINTER: { // POINTER: [pointee type] or 557 // [pointee type, address space] 558 if (Record.size() < 1) 559 return Error("Invalid POINTER type record"); 560 unsigned AddressSpace = 0; 561 if (Record.size() == 2) 562 AddressSpace = Record[1]; 563 ResultTy = PointerType::get(getTypeByID(Record[0], true), 564 AddressSpace); 565 break; 566 } 567 case bitc::TYPE_CODE_FUNCTION: { 568 // FIXME: attrid is dead, remove it in LLVM 3.0 569 // FUNCTION: [vararg, attrid, retty, paramty x N] 570 if (Record.size() < 3) 571 return Error("Invalid FUNCTION type record"); 572 std::vector<const Type*> ArgTys; 573 for (unsigned i = 3, e = Record.size(); i != e; ++i) 574 ArgTys.push_back(getTypeByID(Record[i], true)); 575 576 ResultTy = FunctionType::get(getTypeByID(Record[2], true), ArgTys, 577 Record[0]); 578 break; 579 } 580 case bitc::TYPE_CODE_STRUCT: { // STRUCT: [ispacked, eltty x N] 581 if (Record.size() < 1) 582 return Error("Invalid STRUCT type record"); 583 std::vector<const Type*> EltTys; 584 for (unsigned i = 1, e = Record.size(); i != e; ++i) 585 EltTys.push_back(getTypeByID(Record[i], true)); 586 ResultTy = StructType::get(Context, EltTys, Record[0]); 587 break; 588 } 589 case bitc::TYPE_CODE_ARRAY: // ARRAY: [numelts, eltty] 590 if (Record.size() < 2) 591 return Error("Invalid ARRAY type record"); 592 ResultTy = ArrayType::get(getTypeByID(Record[1], true), Record[0]); 593 break; 594 case bitc::TYPE_CODE_VECTOR: // VECTOR: [numelts, eltty] 595 if (Record.size() < 2) 596 return Error("Invalid VECTOR type record"); 597 ResultTy = VectorType::get(getTypeByID(Record[1], true), Record[0]); 598 break; 599 } 600 601 if (NumRecords == TypeList.size()) { 602 // If this is a new type slot, just append it. 603 TypeList.push_back(ResultTy ? ResultTy : OpaqueType::get(Context)); 604 ++NumRecords; 605 } else if (ResultTy == 0) { 606 // Otherwise, this was forward referenced, so an opaque type was created, 607 // but the result type is actually just an opaque. Leave the one we 608 // created previously. 609 ++NumRecords; 610 } else { 611 // Otherwise, this was forward referenced, so an opaque type was created. 612 // Resolve the opaque type to the real type now. 613 assert(NumRecords < TypeList.size() && "Typelist imbalance"); 614 const OpaqueType *OldTy = cast<OpaqueType>(TypeList[NumRecords++].get()); 615 616 // Don't directly push the new type on the Tab. Instead we want to replace 617 // the opaque type we previously inserted with the new concrete value. The 618 // refinement from the abstract (opaque) type to the new type causes all 619 // uses of the abstract type to use the concrete type (NewTy). This will 620 // also cause the opaque type to be deleted. 621 const_cast<OpaqueType*>(OldTy)->refineAbstractTypeTo(ResultTy); 622 623 // This should have replaced the old opaque type with the new type in the 624 // value table... or with a preexisting type that was already in the 625 // system. Let's just make sure it did. 626 assert(TypeList[NumRecords-1].get() != OldTy && 627 "refineAbstractType didn't work!"); 628 } 629 } 630} 631 632 633bool BitcodeReader::ParseTypeSymbolTable() { 634 if (Stream.EnterSubBlock(bitc::TYPE_SYMTAB_BLOCK_ID)) 635 return Error("Malformed block record"); 636 637 SmallVector<uint64_t, 64> Record; 638 639 // Read all the records for this type table. 640 std::string TypeName; 641 while (1) { 642 unsigned Code = Stream.ReadCode(); 643 if (Code == bitc::END_BLOCK) { 644 if (Stream.ReadBlockEnd()) 645 return Error("Error at end of type symbol table block"); 646 return false; 647 } 648 649 if (Code == bitc::ENTER_SUBBLOCK) { 650 // No known subblocks, always skip them. 651 Stream.ReadSubBlockID(); 652 if (Stream.SkipBlock()) 653 return Error("Malformed block record"); 654 continue; 655 } 656 657 if (Code == bitc::DEFINE_ABBREV) { 658 Stream.ReadAbbrevRecord(); 659 continue; 660 } 661 662 // Read a record. 663 Record.clear(); 664 switch (Stream.ReadRecord(Code, Record)) { 665 default: // Default behavior: unknown type. 666 break; 667 case bitc::TST_CODE_ENTRY: // TST_ENTRY: [typeid, namechar x N] 668 if (ConvertToString(Record, 1, TypeName)) 669 return Error("Invalid TST_ENTRY record"); 670 unsigned TypeID = Record[0]; 671 if (TypeID >= TypeList.size()) 672 return Error("Invalid Type ID in TST_ENTRY record"); 673 674 TheModule->addTypeName(TypeName, TypeList[TypeID].get()); 675 TypeName.clear(); 676 break; 677 } 678 } 679} 680 681bool BitcodeReader::ParseValueSymbolTable() { 682 if (Stream.EnterSubBlock(bitc::VALUE_SYMTAB_BLOCK_ID)) 683 return Error("Malformed block record"); 684 685 SmallVector<uint64_t, 64> Record; 686 687 // Read all the records for this value table. 688 SmallString<128> ValueName; 689 while (1) { 690 unsigned Code = Stream.ReadCode(); 691 if (Code == bitc::END_BLOCK) { 692 if (Stream.ReadBlockEnd()) 693 return Error("Error at end of value symbol table block"); 694 return false; 695 } 696 if (Code == bitc::ENTER_SUBBLOCK) { 697 // No known subblocks, always skip them. 698 Stream.ReadSubBlockID(); 699 if (Stream.SkipBlock()) 700 return Error("Malformed block record"); 701 continue; 702 } 703 704 if (Code == bitc::DEFINE_ABBREV) { 705 Stream.ReadAbbrevRecord(); 706 continue; 707 } 708 709 // Read a record. 710 Record.clear(); 711 switch (Stream.ReadRecord(Code, Record)) { 712 default: // Default behavior: unknown type. 713 break; 714 case bitc::VST_CODE_ENTRY: { // VST_ENTRY: [valueid, namechar x N] 715 if (ConvertToString(Record, 1, ValueName)) 716 return Error("Invalid VST_ENTRY record"); 717 unsigned ValueID = Record[0]; 718 if (ValueID >= ValueList.size()) 719 return Error("Invalid Value ID in VST_ENTRY record"); 720 Value *V = ValueList[ValueID]; 721 722 V->setName(StringRef(ValueName.data(), ValueName.size())); 723 ValueName.clear(); 724 break; 725 } 726 case bitc::VST_CODE_BBENTRY: { 727 if (ConvertToString(Record, 1, ValueName)) 728 return Error("Invalid VST_BBENTRY record"); 729 BasicBlock *BB = getBasicBlock(Record[0]); 730 if (BB == 0) 731 return Error("Invalid BB ID in VST_BBENTRY record"); 732 733 BB->setName(StringRef(ValueName.data(), ValueName.size())); 734 ValueName.clear(); 735 break; 736 } 737 } 738 } 739} 740 741bool BitcodeReader::ParseMetadata() { 742 unsigned NextValueNo = MDValueList.size(); 743 744 if (Stream.EnterSubBlock(bitc::METADATA_BLOCK_ID)) 745 return Error("Malformed block record"); 746 747 SmallVector<uint64_t, 64> Record; 748 749 // Read all the records. 750 while (1) { 751 unsigned Code = Stream.ReadCode(); 752 if (Code == bitc::END_BLOCK) { 753 if (Stream.ReadBlockEnd()) 754 return Error("Error at end of PARAMATTR block"); 755 return false; 756 } 757 758 if (Code == bitc::ENTER_SUBBLOCK) { 759 // No known subblocks, always skip them. 760 Stream.ReadSubBlockID(); 761 if (Stream.SkipBlock()) 762 return Error("Malformed block record"); 763 continue; 764 } 765 766 if (Code == bitc::DEFINE_ABBREV) { 767 Stream.ReadAbbrevRecord(); 768 continue; 769 } 770 771 // Read a record. 772 Record.clear(); 773 switch (Stream.ReadRecord(Code, Record)) { 774 default: // Default behavior: ignore. 775 break; 776 case bitc::METADATA_NAME: { 777 // Read named of the named metadata. 778 unsigned NameLength = Record.size(); 779 SmallString<8> Name; 780 Name.resize(NameLength); 781 for (unsigned i = 0; i != NameLength; ++i) 782 Name[i] = Record[i]; 783 Record.clear(); 784 Code = Stream.ReadCode(); 785 786 // METADATA_NAME is always followed by METADATA_NAMED_NODE. 787 if (Stream.ReadRecord(Code, Record) != bitc::METADATA_NAMED_NODE) 788 assert ( 0 && "Inavlid Named Metadata record"); 789 790 // Read named metadata elements. 791 unsigned Size = Record.size(); 792 SmallVector<MetadataBase*, 8> Elts; 793 for (unsigned i = 0; i != Size; ++i) { 794 Value *MD = MDValueList.getValueFwdRef(Record[i]); 795 if (MetadataBase *B = dyn_cast<MetadataBase>(MD)) 796 Elts.push_back(B); 797 } 798 Value *V = NamedMDNode::Create(Context, Name.str(), Elts.data(), 799 Elts.size(), TheModule); 800 MDValueList.AssignValue(V, NextValueNo++); 801 break; 802 } 803 case bitc::METADATA_NODE: { 804 if (Record.empty() || Record.size() % 2 == 1) 805 return Error("Invalid METADATA_NODE record"); 806 807 unsigned Size = Record.size(); 808 SmallVector<Value*, 8> Elts; 809 for (unsigned i = 0; i != Size; i += 2) { 810 const Type *Ty = getTypeByID(Record[i], false); 811 if (Ty == Type::getMetadataTy(Context)) 812 Elts.push_back(MDValueList.getValueFwdRef(Record[i+1])); 813 else if (Ty != Type::getVoidTy(Context)) 814 Elts.push_back(ValueList.getValueFwdRef(Record[i+1], Ty)); 815 else 816 Elts.push_back(NULL); 817 } 818 Value *V = MDNode::get(Context, &Elts[0], Elts.size()); 819 MDValueList.AssignValue(V, NextValueNo++); 820 break; 821 } 822 case bitc::METADATA_STRING: { 823 unsigned MDStringLength = Record.size(); 824 SmallString<8> String; 825 String.resize(MDStringLength); 826 for (unsigned i = 0; i != MDStringLength; ++i) 827 String[i] = Record[i]; 828 Value *V = MDString::get(Context, 829 StringRef(String.data(), String.size())); 830 MDValueList.AssignValue(V, NextValueNo++); 831 break; 832 } 833 } 834 } 835} 836 837/// DecodeSignRotatedValue - Decode a signed value stored with the sign bit in 838/// the LSB for dense VBR encoding. 839static uint64_t DecodeSignRotatedValue(uint64_t V) { 840 if ((V & 1) == 0) 841 return V >> 1; 842 if (V != 1) 843 return -(V >> 1); 844 // There is no such thing as -0 with integers. "-0" really means MININT. 845 return 1ULL << 63; 846} 847 848/// ResolveGlobalAndAliasInits - Resolve all of the initializers for global 849/// values and aliases that we can. 850bool BitcodeReader::ResolveGlobalAndAliasInits() { 851 std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInitWorklist; 852 std::vector<std::pair<GlobalAlias*, unsigned> > AliasInitWorklist; 853 854 GlobalInitWorklist.swap(GlobalInits); 855 AliasInitWorklist.swap(AliasInits); 856 857 while (!GlobalInitWorklist.empty()) { 858 unsigned ValID = GlobalInitWorklist.back().second; 859 if (ValID >= ValueList.size()) { 860 // Not ready to resolve this yet, it requires something later in the file. 861 GlobalInits.push_back(GlobalInitWorklist.back()); 862 } else { 863 if (Constant *C = dyn_cast<Constant>(ValueList[ValID])) 864 GlobalInitWorklist.back().first->setInitializer(C); 865 else 866 return Error("Global variable initializer is not a constant!"); 867 } 868 GlobalInitWorklist.pop_back(); 869 } 870 871 while (!AliasInitWorklist.empty()) { 872 unsigned ValID = AliasInitWorklist.back().second; 873 if (ValID >= ValueList.size()) { 874 AliasInits.push_back(AliasInitWorklist.back()); 875 } else { 876 if (Constant *C = dyn_cast<Constant>(ValueList[ValID])) 877 AliasInitWorklist.back().first->setAliasee(C); 878 else 879 return Error("Alias initializer is not a constant!"); 880 } 881 AliasInitWorklist.pop_back(); 882 } 883 return false; 884} 885 886static void SetOptimizationFlags(Value *V, uint64_t Flags) { 887 if (OverflowingBinaryOperator *OBO = 888 dyn_cast<OverflowingBinaryOperator>(V)) { 889 if (Flags & (1 << bitc::OBO_NO_SIGNED_WRAP)) 890 OBO->setHasNoSignedWrap(true); 891 if (Flags & (1 << bitc::OBO_NO_UNSIGNED_WRAP)) 892 OBO->setHasNoUnsignedWrap(true); 893 } else if (SDivOperator *Div = dyn_cast<SDivOperator>(V)) { 894 if (Flags & (1 << bitc::SDIV_EXACT)) 895 Div->setIsExact(true); 896 } 897} 898 899bool BitcodeReader::ParseConstants() { 900 if (Stream.EnterSubBlock(bitc::CONSTANTS_BLOCK_ID)) 901 return Error("Malformed block record"); 902 903 SmallVector<uint64_t, 64> Record; 904 905 // Read all the records for this value table. 906 const Type *CurTy = Type::getInt32Ty(Context); 907 unsigned NextCstNo = ValueList.size(); 908 while (1) { 909 unsigned Code = Stream.ReadCode(); 910 if (Code == bitc::END_BLOCK) 911 break; 912 913 if (Code == bitc::ENTER_SUBBLOCK) { 914 // No known subblocks, always skip them. 915 Stream.ReadSubBlockID(); 916 if (Stream.SkipBlock()) 917 return Error("Malformed block record"); 918 continue; 919 } 920 921 if (Code == bitc::DEFINE_ABBREV) { 922 Stream.ReadAbbrevRecord(); 923 continue; 924 } 925 926 // Read a record. 927 Record.clear(); 928 Value *V = 0; 929 unsigned BitCode = Stream.ReadRecord(Code, Record); 930 switch (BitCode) { 931 default: // Default behavior: unknown constant 932 case bitc::CST_CODE_UNDEF: // UNDEF 933 V = UndefValue::get(CurTy); 934 break; 935 case bitc::CST_CODE_SETTYPE: // SETTYPE: [typeid] 936 if (Record.empty()) 937 return Error("Malformed CST_SETTYPE record"); 938 if (Record[0] >= TypeList.size()) 939 return Error("Invalid Type ID in CST_SETTYPE record"); 940 CurTy = TypeList[Record[0]]; 941 continue; // Skip the ValueList manipulation. 942 case bitc::CST_CODE_NULL: // NULL 943 V = Constant::getNullValue(CurTy); 944 break; 945 case bitc::CST_CODE_INTEGER: // INTEGER: [intval] 946 if (!isa<IntegerType>(CurTy) || Record.empty()) 947 return Error("Invalid CST_INTEGER record"); 948 V = ConstantInt::get(CurTy, DecodeSignRotatedValue(Record[0])); 949 break; 950 case bitc::CST_CODE_WIDE_INTEGER: {// WIDE_INTEGER: [n x intval] 951 if (!isa<IntegerType>(CurTy) || Record.empty()) 952 return Error("Invalid WIDE_INTEGER record"); 953 954 unsigned NumWords = Record.size(); 955 SmallVector<uint64_t, 8> Words; 956 Words.resize(NumWords); 957 for (unsigned i = 0; i != NumWords; ++i) 958 Words[i] = DecodeSignRotatedValue(Record[i]); 959 V = ConstantInt::get(Context, 960 APInt(cast<IntegerType>(CurTy)->getBitWidth(), 961 NumWords, &Words[0])); 962 break; 963 } 964 case bitc::CST_CODE_FLOAT: { // FLOAT: [fpval] 965 if (Record.empty()) 966 return Error("Invalid FLOAT record"); 967 if (CurTy == Type::getFloatTy(Context)) 968 V = ConstantFP::get(Context, APFloat(APInt(32, (uint32_t)Record[0]))); 969 else if (CurTy == Type::getDoubleTy(Context)) 970 V = ConstantFP::get(Context, APFloat(APInt(64, Record[0]))); 971 else if (CurTy == Type::getX86_FP80Ty(Context)) { 972 // Bits are not stored the same way as a normal i80 APInt, compensate. 973 uint64_t Rearrange[2]; 974 Rearrange[0] = (Record[1] & 0xffffLL) | (Record[0] << 16); 975 Rearrange[1] = Record[0] >> 48; 976 V = ConstantFP::get(Context, APFloat(APInt(80, 2, Rearrange))); 977 } else if (CurTy == Type::getFP128Ty(Context)) 978 V = ConstantFP::get(Context, APFloat(APInt(128, 2, &Record[0]), true)); 979 else if (CurTy == Type::getPPC_FP128Ty(Context)) 980 V = ConstantFP::get(Context, APFloat(APInt(128, 2, &Record[0]))); 981 else 982 V = UndefValue::get(CurTy); 983 break; 984 } 985 986 case bitc::CST_CODE_AGGREGATE: {// AGGREGATE: [n x value number] 987 if (Record.empty()) 988 return Error("Invalid CST_AGGREGATE record"); 989 990 unsigned Size = Record.size(); 991 std::vector<Constant*> Elts; 992 993 if (const StructType *STy = dyn_cast<StructType>(CurTy)) { 994 for (unsigned i = 0; i != Size; ++i) 995 Elts.push_back(ValueList.getConstantFwdRef(Record[i], 996 STy->getElementType(i))); 997 V = ConstantStruct::get(STy, Elts); 998 } else if (const ArrayType *ATy = dyn_cast<ArrayType>(CurTy)) { 999 const Type *EltTy = ATy->getElementType(); 1000 for (unsigned i = 0; i != Size; ++i) 1001 Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy)); 1002 V = ConstantArray::get(ATy, Elts); 1003 } else if (const VectorType *VTy = dyn_cast<VectorType>(CurTy)) { 1004 const Type *EltTy = VTy->getElementType(); 1005 for (unsigned i = 0; i != Size; ++i) 1006 Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy)); 1007 V = ConstantVector::get(Elts); 1008 } else { 1009 V = UndefValue::get(CurTy); 1010 } 1011 break; 1012 } 1013 case bitc::CST_CODE_STRING: { // STRING: [values] 1014 if (Record.empty()) 1015 return Error("Invalid CST_AGGREGATE record"); 1016 1017 const ArrayType *ATy = cast<ArrayType>(CurTy); 1018 const Type *EltTy = ATy->getElementType(); 1019 1020 unsigned Size = Record.size(); 1021 std::vector<Constant*> Elts; 1022 for (unsigned i = 0; i != Size; ++i) 1023 Elts.push_back(ConstantInt::get(EltTy, Record[i])); 1024 V = ConstantArray::get(ATy, Elts); 1025 break; 1026 } 1027 case bitc::CST_CODE_CSTRING: { // CSTRING: [values] 1028 if (Record.empty()) 1029 return Error("Invalid CST_AGGREGATE record"); 1030 1031 const ArrayType *ATy = cast<ArrayType>(CurTy); 1032 const Type *EltTy = ATy->getElementType(); 1033 1034 unsigned Size = Record.size(); 1035 std::vector<Constant*> Elts; 1036 for (unsigned i = 0; i != Size; ++i) 1037 Elts.push_back(ConstantInt::get(EltTy, Record[i])); 1038 Elts.push_back(Constant::getNullValue(EltTy)); 1039 V = ConstantArray::get(ATy, Elts); 1040 break; 1041 } 1042 case bitc::CST_CODE_CE_BINOP: { // CE_BINOP: [opcode, opval, opval] 1043 if (Record.size() < 3) return Error("Invalid CE_BINOP record"); 1044 int Opc = GetDecodedBinaryOpcode(Record[0], CurTy); 1045 if (Opc < 0) { 1046 V = UndefValue::get(CurTy); // Unknown binop. 1047 } else { 1048 Constant *LHS = ValueList.getConstantFwdRef(Record[1], CurTy); 1049 Constant *RHS = ValueList.getConstantFwdRef(Record[2], CurTy); 1050 V = ConstantExpr::get(Opc, LHS, RHS); 1051 } 1052 if (Record.size() >= 4) 1053 SetOptimizationFlags(V, Record[3]); 1054 break; 1055 } 1056 case bitc::CST_CODE_CE_CAST: { // CE_CAST: [opcode, opty, opval] 1057 if (Record.size() < 3) return Error("Invalid CE_CAST record"); 1058 int Opc = GetDecodedCastOpcode(Record[0]); 1059 if (Opc < 0) { 1060 V = UndefValue::get(CurTy); // Unknown cast. 1061 } else { 1062 const Type *OpTy = getTypeByID(Record[1]); 1063 if (!OpTy) return Error("Invalid CE_CAST record"); 1064 Constant *Op = ValueList.getConstantFwdRef(Record[2], OpTy); 1065 V = ConstantExpr::getCast(Opc, Op, CurTy); 1066 } 1067 break; 1068 } 1069 case bitc::CST_CODE_CE_INBOUNDS_GEP: 1070 case bitc::CST_CODE_CE_GEP: { // CE_GEP: [n x operands] 1071 if (Record.size() & 1) return Error("Invalid CE_GEP record"); 1072 SmallVector<Constant*, 16> Elts; 1073 for (unsigned i = 0, e = Record.size(); i != e; i += 2) { 1074 const Type *ElTy = getTypeByID(Record[i]); 1075 if (!ElTy) return Error("Invalid CE_GEP record"); 1076 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], ElTy)); 1077 } 1078 V = ConstantExpr::getGetElementPtr(Elts[0], &Elts[1], 1079 Elts.size()-1); 1080 if (BitCode == bitc::CST_CODE_CE_INBOUNDS_GEP) 1081 cast<GEPOperator>(V)->setIsInBounds(true); 1082 break; 1083 } 1084 case bitc::CST_CODE_CE_SELECT: // CE_SELECT: [opval#, opval#, opval#] 1085 if (Record.size() < 3) return Error("Invalid CE_SELECT record"); 1086 V = ConstantExpr::getSelect(ValueList.getConstantFwdRef(Record[0], 1087 Type::getInt1Ty(Context)), 1088 ValueList.getConstantFwdRef(Record[1],CurTy), 1089 ValueList.getConstantFwdRef(Record[2],CurTy)); 1090 break; 1091 case bitc::CST_CODE_CE_EXTRACTELT: { // CE_EXTRACTELT: [opty, opval, opval] 1092 if (Record.size() < 3) return Error("Invalid CE_EXTRACTELT record"); 1093 const VectorType *OpTy = 1094 dyn_cast_or_null<VectorType>(getTypeByID(Record[0])); 1095 if (OpTy == 0) return Error("Invalid CE_EXTRACTELT record"); 1096 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 1097 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], Type::getInt32Ty(Context)); 1098 V = ConstantExpr::getExtractElement(Op0, Op1); 1099 break; 1100 } 1101 case bitc::CST_CODE_CE_INSERTELT: { // CE_INSERTELT: [opval, opval, opval] 1102 const VectorType *OpTy = dyn_cast<VectorType>(CurTy); 1103 if (Record.size() < 3 || OpTy == 0) 1104 return Error("Invalid CE_INSERTELT record"); 1105 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); 1106 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], 1107 OpTy->getElementType()); 1108 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], Type::getInt32Ty(Context)); 1109 V = ConstantExpr::getInsertElement(Op0, Op1, Op2); 1110 break; 1111 } 1112 case bitc::CST_CODE_CE_SHUFFLEVEC: { // CE_SHUFFLEVEC: [opval, opval, opval] 1113 const VectorType *OpTy = dyn_cast<VectorType>(CurTy); 1114 if (Record.size() < 3 || OpTy == 0) 1115 return Error("Invalid CE_SHUFFLEVEC record"); 1116 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); 1117 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], OpTy); 1118 const Type *ShufTy = VectorType::get(Type::getInt32Ty(Context), 1119 OpTy->getNumElements()); 1120 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], ShufTy); 1121 V = ConstantExpr::getShuffleVector(Op0, Op1, Op2); 1122 break; 1123 } 1124 case bitc::CST_CODE_CE_SHUFVEC_EX: { // [opty, opval, opval, opval] 1125 const VectorType *RTy = dyn_cast<VectorType>(CurTy); 1126 const VectorType *OpTy = dyn_cast<VectorType>(getTypeByID(Record[0])); 1127 if (Record.size() < 4 || RTy == 0 || OpTy == 0) 1128 return Error("Invalid CE_SHUFVEC_EX record"); 1129 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 1130 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy); 1131 const Type *ShufTy = VectorType::get(Type::getInt32Ty(Context), 1132 RTy->getNumElements()); 1133 Constant *Op2 = ValueList.getConstantFwdRef(Record[3], ShufTy); 1134 V = ConstantExpr::getShuffleVector(Op0, Op1, Op2); 1135 break; 1136 } 1137 case bitc::CST_CODE_CE_CMP: { // CE_CMP: [opty, opval, opval, pred] 1138 if (Record.size() < 4) return Error("Invalid CE_CMP record"); 1139 const Type *OpTy = getTypeByID(Record[0]); 1140 if (OpTy == 0) return Error("Invalid CE_CMP record"); 1141 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 1142 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy); 1143 1144 if (OpTy->isFloatingPoint()) 1145 V = ConstantExpr::getFCmp(Record[3], Op0, Op1); 1146 else 1147 V = ConstantExpr::getICmp(Record[3], Op0, Op1); 1148 break; 1149 } 1150 case bitc::CST_CODE_INLINEASM: { 1151 if (Record.size() < 2) return Error("Invalid INLINEASM record"); 1152 std::string AsmStr, ConstrStr; 1153 bool HasSideEffects = Record[0]; 1154 unsigned AsmStrSize = Record[1]; 1155 if (2+AsmStrSize >= Record.size()) 1156 return Error("Invalid INLINEASM record"); 1157 unsigned ConstStrSize = Record[2+AsmStrSize]; 1158 if (3+AsmStrSize+ConstStrSize > Record.size()) 1159 return Error("Invalid INLINEASM record"); 1160 1161 for (unsigned i = 0; i != AsmStrSize; ++i) 1162 AsmStr += (char)Record[2+i]; 1163 for (unsigned i = 0; i != ConstStrSize; ++i) 1164 ConstrStr += (char)Record[3+AsmStrSize+i]; 1165 const PointerType *PTy = cast<PointerType>(CurTy); 1166 V = InlineAsm::get(cast<FunctionType>(PTy->getElementType()), 1167 AsmStr, ConstrStr, HasSideEffects); 1168 break; 1169 } 1170 } 1171 1172 ValueList.AssignValue(V, NextCstNo); 1173 ++NextCstNo; 1174 } 1175 1176 if (NextCstNo != ValueList.size()) 1177 return Error("Invalid constant reference!"); 1178 1179 if (Stream.ReadBlockEnd()) 1180 return Error("Error at end of constants block"); 1181 1182 // Once all the constants have been read, go through and resolve forward 1183 // references. 1184 ValueList.ResolveConstantForwardRefs(); 1185 return false; 1186} 1187 1188/// RememberAndSkipFunctionBody - When we see the block for a function body, 1189/// remember where it is and then skip it. This lets us lazily deserialize the 1190/// functions. 1191bool BitcodeReader::RememberAndSkipFunctionBody() { 1192 // Get the function we are talking about. 1193 if (FunctionsWithBodies.empty()) 1194 return Error("Insufficient function protos"); 1195 1196 Function *Fn = FunctionsWithBodies.back(); 1197 FunctionsWithBodies.pop_back(); 1198 1199 // Save the current stream state. 1200 uint64_t CurBit = Stream.GetCurrentBitNo(); 1201 DeferredFunctionInfo[Fn] = std::make_pair(CurBit, Fn->getLinkage()); 1202 1203 // Set the functions linkage to GhostLinkage so we know it is lazily 1204 // deserialized. 1205 Fn->setLinkage(GlobalValue::GhostLinkage); 1206 1207 // Skip over the function block for now. 1208 if (Stream.SkipBlock()) 1209 return Error("Malformed block record"); 1210 return false; 1211} 1212 1213bool BitcodeReader::ParseModule(const std::string &ModuleID) { 1214 // Reject multiple MODULE_BLOCK's in a single bitstream. 1215 if (TheModule) 1216 return Error("Multiple MODULE_BLOCKs in same stream"); 1217 1218 if (Stream.EnterSubBlock(bitc::MODULE_BLOCK_ID)) 1219 return Error("Malformed block record"); 1220 1221 // Otherwise, create the module. 1222 TheModule = new Module(ModuleID, Context); 1223 1224 SmallVector<uint64_t, 64> Record; 1225 std::vector<std::string> SectionTable; 1226 std::vector<std::string> GCTable; 1227 1228 // Read all the records for this module. 1229 while (!Stream.AtEndOfStream()) { 1230 unsigned Code = Stream.ReadCode(); 1231 if (Code == bitc::END_BLOCK) { 1232 if (Stream.ReadBlockEnd()) 1233 return Error("Error at end of module block"); 1234 1235 // Patch the initializers for globals and aliases up. 1236 ResolveGlobalAndAliasInits(); 1237 if (!GlobalInits.empty() || !AliasInits.empty()) 1238 return Error("Malformed global initializer set"); 1239 if (!FunctionsWithBodies.empty()) 1240 return Error("Too few function bodies found"); 1241 1242 // Look for intrinsic functions which need to be upgraded at some point 1243 for (Module::iterator FI = TheModule->begin(), FE = TheModule->end(); 1244 FI != FE; ++FI) { 1245 Function* NewFn; 1246 if (UpgradeIntrinsicFunction(FI, NewFn)) 1247 UpgradedIntrinsics.push_back(std::make_pair(FI, NewFn)); 1248 } 1249 1250 // Force deallocation of memory for these vectors to favor the client that 1251 // want lazy deserialization. 1252 std::vector<std::pair<GlobalVariable*, unsigned> >().swap(GlobalInits); 1253 std::vector<std::pair<GlobalAlias*, unsigned> >().swap(AliasInits); 1254 std::vector<Function*>().swap(FunctionsWithBodies); 1255 return false; 1256 } 1257 1258 if (Code == bitc::ENTER_SUBBLOCK) { 1259 switch (Stream.ReadSubBlockID()) { 1260 default: // Skip unknown content. 1261 if (Stream.SkipBlock()) 1262 return Error("Malformed block record"); 1263 break; 1264 case bitc::BLOCKINFO_BLOCK_ID: 1265 if (Stream.ReadBlockInfoBlock()) 1266 return Error("Malformed BlockInfoBlock"); 1267 break; 1268 case bitc::PARAMATTR_BLOCK_ID: 1269 if (ParseAttributeBlock()) 1270 return true; 1271 break; 1272 case bitc::TYPE_BLOCK_ID: 1273 if (ParseTypeTable()) 1274 return true; 1275 break; 1276 case bitc::TYPE_SYMTAB_BLOCK_ID: 1277 if (ParseTypeSymbolTable()) 1278 return true; 1279 break; 1280 case bitc::VALUE_SYMTAB_BLOCK_ID: 1281 if (ParseValueSymbolTable()) 1282 return true; 1283 break; 1284 case bitc::CONSTANTS_BLOCK_ID: 1285 if (ParseConstants() || ResolveGlobalAndAliasInits()) 1286 return true; 1287 break; 1288 case bitc::METADATA_BLOCK_ID: 1289 if (ParseMetadata()) 1290 return true; 1291 break; 1292 case bitc::FUNCTION_BLOCK_ID: 1293 // If this is the first function body we've seen, reverse the 1294 // FunctionsWithBodies list. 1295 if (!HasReversedFunctionsWithBodies) { 1296 std::reverse(FunctionsWithBodies.begin(), FunctionsWithBodies.end()); 1297 HasReversedFunctionsWithBodies = true; 1298 } 1299 1300 if (RememberAndSkipFunctionBody()) 1301 return true; 1302 break; 1303 } 1304 continue; 1305 } 1306 1307 if (Code == bitc::DEFINE_ABBREV) { 1308 Stream.ReadAbbrevRecord(); 1309 continue; 1310 } 1311 1312 // Read a record. 1313 switch (Stream.ReadRecord(Code, Record)) { 1314 default: break; // Default behavior, ignore unknown content. 1315 case bitc::MODULE_CODE_VERSION: // VERSION: [version#] 1316 if (Record.size() < 1) 1317 return Error("Malformed MODULE_CODE_VERSION"); 1318 // Only version #0 is supported so far. 1319 if (Record[0] != 0) 1320 return Error("Unknown bitstream version!"); 1321 break; 1322 case bitc::MODULE_CODE_TRIPLE: { // TRIPLE: [strchr x N] 1323 std::string S; 1324 if (ConvertToString(Record, 0, S)) 1325 return Error("Invalid MODULE_CODE_TRIPLE record"); 1326 TheModule->setTargetTriple(S); 1327 break; 1328 } 1329 case bitc::MODULE_CODE_DATALAYOUT: { // DATALAYOUT: [strchr x N] 1330 std::string S; 1331 if (ConvertToString(Record, 0, S)) 1332 return Error("Invalid MODULE_CODE_DATALAYOUT record"); 1333 TheModule->setDataLayout(S); 1334 break; 1335 } 1336 case bitc::MODULE_CODE_ASM: { // ASM: [strchr x N] 1337 std::string S; 1338 if (ConvertToString(Record, 0, S)) 1339 return Error("Invalid MODULE_CODE_ASM record"); 1340 TheModule->setModuleInlineAsm(S); 1341 break; 1342 } 1343 case bitc::MODULE_CODE_DEPLIB: { // DEPLIB: [strchr x N] 1344 std::string S; 1345 if (ConvertToString(Record, 0, S)) 1346 return Error("Invalid MODULE_CODE_DEPLIB record"); 1347 TheModule->addLibrary(S); 1348 break; 1349 } 1350 case bitc::MODULE_CODE_SECTIONNAME: { // SECTIONNAME: [strchr x N] 1351 std::string S; 1352 if (ConvertToString(Record, 0, S)) 1353 return Error("Invalid MODULE_CODE_SECTIONNAME record"); 1354 SectionTable.push_back(S); 1355 break; 1356 } 1357 case bitc::MODULE_CODE_GCNAME: { // SECTIONNAME: [strchr x N] 1358 std::string S; 1359 if (ConvertToString(Record, 0, S)) 1360 return Error("Invalid MODULE_CODE_GCNAME record"); 1361 GCTable.push_back(S); 1362 break; 1363 } 1364 // GLOBALVAR: [pointer type, isconst, initid, 1365 // linkage, alignment, section, visibility, threadlocal] 1366 case bitc::MODULE_CODE_GLOBALVAR: { 1367 if (Record.size() < 6) 1368 return Error("Invalid MODULE_CODE_GLOBALVAR record"); 1369 const Type *Ty = getTypeByID(Record[0]); 1370 if (!isa<PointerType>(Ty)) 1371 return Error("Global not a pointer type!"); 1372 unsigned AddressSpace = cast<PointerType>(Ty)->getAddressSpace(); 1373 Ty = cast<PointerType>(Ty)->getElementType(); 1374 1375 bool isConstant = Record[1]; 1376 GlobalValue::LinkageTypes Linkage = GetDecodedLinkage(Record[3]); 1377 unsigned Alignment = (1 << Record[4]) >> 1; 1378 std::string Section; 1379 if (Record[5]) { 1380 if (Record[5]-1 >= SectionTable.size()) 1381 return Error("Invalid section ID"); 1382 Section = SectionTable[Record[5]-1]; 1383 } 1384 GlobalValue::VisibilityTypes Visibility = GlobalValue::DefaultVisibility; 1385 if (Record.size() > 6) 1386 Visibility = GetDecodedVisibility(Record[6]); 1387 bool isThreadLocal = false; 1388 if (Record.size() > 7) 1389 isThreadLocal = Record[7]; 1390 1391 GlobalVariable *NewGV = 1392 new GlobalVariable(*TheModule, Ty, isConstant, Linkage, 0, "", 0, 1393 isThreadLocal, AddressSpace); 1394 NewGV->setAlignment(Alignment); 1395 if (!Section.empty()) 1396 NewGV->setSection(Section); 1397 NewGV->setVisibility(Visibility); 1398 NewGV->setThreadLocal(isThreadLocal); 1399 1400 ValueList.push_back(NewGV); 1401 1402 // Remember which value to use for the global initializer. 1403 if (unsigned InitID = Record[2]) 1404 GlobalInits.push_back(std::make_pair(NewGV, InitID-1)); 1405 break; 1406 } 1407 // FUNCTION: [type, callingconv, isproto, linkage, paramattr, 1408 // alignment, section, visibility, gc] 1409 case bitc::MODULE_CODE_FUNCTION: { 1410 if (Record.size() < 8) 1411 return Error("Invalid MODULE_CODE_FUNCTION record"); 1412 const Type *Ty = getTypeByID(Record[0]); 1413 if (!isa<PointerType>(Ty)) 1414 return Error("Function not a pointer type!"); 1415 const FunctionType *FTy = 1416 dyn_cast<FunctionType>(cast<PointerType>(Ty)->getElementType()); 1417 if (!FTy) 1418 return Error("Function not a pointer to function type!"); 1419 1420 Function *Func = Function::Create(FTy, GlobalValue::ExternalLinkage, 1421 "", TheModule); 1422 1423 Func->setCallingConv(static_cast<CallingConv::ID>(Record[1])); 1424 bool isProto = Record[2]; 1425 Func->setLinkage(GetDecodedLinkage(Record[3])); 1426 Func->setAttributes(getAttributes(Record[4])); 1427 1428 Func->setAlignment((1 << Record[5]) >> 1); 1429 if (Record[6]) { 1430 if (Record[6]-1 >= SectionTable.size()) 1431 return Error("Invalid section ID"); 1432 Func->setSection(SectionTable[Record[6]-1]); 1433 } 1434 Func->setVisibility(GetDecodedVisibility(Record[7])); 1435 if (Record.size() > 8 && Record[8]) { 1436 if (Record[8]-1 > GCTable.size()) 1437 return Error("Invalid GC ID"); 1438 Func->setGC(GCTable[Record[8]-1].c_str()); 1439 } 1440 ValueList.push_back(Func); 1441 1442 // If this is a function with a body, remember the prototype we are 1443 // creating now, so that we can match up the body with them later. 1444 if (!isProto) 1445 FunctionsWithBodies.push_back(Func); 1446 break; 1447 } 1448 // ALIAS: [alias type, aliasee val#, linkage] 1449 // ALIAS: [alias type, aliasee val#, linkage, visibility] 1450 case bitc::MODULE_CODE_ALIAS: { 1451 if (Record.size() < 3) 1452 return Error("Invalid MODULE_ALIAS record"); 1453 const Type *Ty = getTypeByID(Record[0]); 1454 if (!isa<PointerType>(Ty)) 1455 return Error("Function not a pointer type!"); 1456 1457 GlobalAlias *NewGA = new GlobalAlias(Ty, GetDecodedLinkage(Record[2]), 1458 "", 0, TheModule); 1459 // Old bitcode files didn't have visibility field. 1460 if (Record.size() > 3) 1461 NewGA->setVisibility(GetDecodedVisibility(Record[3])); 1462 ValueList.push_back(NewGA); 1463 AliasInits.push_back(std::make_pair(NewGA, Record[1])); 1464 break; 1465 } 1466 /// MODULE_CODE_PURGEVALS: [numvals] 1467 case bitc::MODULE_CODE_PURGEVALS: 1468 // Trim down the value list to the specified size. 1469 if (Record.size() < 1 || Record[0] > ValueList.size()) 1470 return Error("Invalid MODULE_PURGEVALS record"); 1471 ValueList.shrinkTo(Record[0]); 1472 break; 1473 } 1474 Record.clear(); 1475 } 1476 1477 return Error("Premature end of bitstream"); 1478} 1479 1480bool BitcodeReader::ParseBitcode() { 1481 TheModule = 0; 1482 1483 if (Buffer->getBufferSize() & 3) 1484 return Error("Bitcode stream should be a multiple of 4 bytes in length"); 1485 1486 unsigned char *BufPtr = (unsigned char *)Buffer->getBufferStart(); 1487 unsigned char *BufEnd = BufPtr+Buffer->getBufferSize(); 1488 1489 // If we have a wrapper header, parse it and ignore the non-bc file contents. 1490 // The magic number is 0x0B17C0DE stored in little endian. 1491 if (isBitcodeWrapper(BufPtr, BufEnd)) 1492 if (SkipBitcodeWrapperHeader(BufPtr, BufEnd)) 1493 return Error("Invalid bitcode wrapper header"); 1494 1495 StreamFile.init(BufPtr, BufEnd); 1496 Stream.init(StreamFile); 1497 1498 // Sniff for the signature. 1499 if (Stream.Read(8) != 'B' || 1500 Stream.Read(8) != 'C' || 1501 Stream.Read(4) != 0x0 || 1502 Stream.Read(4) != 0xC || 1503 Stream.Read(4) != 0xE || 1504 Stream.Read(4) != 0xD) 1505 return Error("Invalid bitcode signature"); 1506 1507 // We expect a number of well-defined blocks, though we don't necessarily 1508 // need to understand them all. 1509 while (!Stream.AtEndOfStream()) { 1510 unsigned Code = Stream.ReadCode(); 1511 1512 if (Code != bitc::ENTER_SUBBLOCK) 1513 return Error("Invalid record at top-level"); 1514 1515 unsigned BlockID = Stream.ReadSubBlockID(); 1516 1517 // We only know the MODULE subblock ID. 1518 switch (BlockID) { 1519 case bitc::BLOCKINFO_BLOCK_ID: 1520 if (Stream.ReadBlockInfoBlock()) 1521 return Error("Malformed BlockInfoBlock"); 1522 break; 1523 case bitc::MODULE_BLOCK_ID: 1524 if (ParseModule(Buffer->getBufferIdentifier())) 1525 return true; 1526 break; 1527 default: 1528 if (Stream.SkipBlock()) 1529 return Error("Malformed block record"); 1530 break; 1531 } 1532 } 1533 1534 return false; 1535} 1536 1537 1538/// ParseFunctionBody - Lazily parse the specified function body block. 1539bool BitcodeReader::ParseFunctionBody(Function *F) { 1540 if (Stream.EnterSubBlock(bitc::FUNCTION_BLOCK_ID)) 1541 return Error("Malformed block record"); 1542 1543 unsigned ModuleValueListSize = ValueList.size(); 1544 1545 // Add all the function arguments to the value table. 1546 for(Function::arg_iterator I = F->arg_begin(), E = F->arg_end(); I != E; ++I) 1547 ValueList.push_back(I); 1548 1549 unsigned NextValueNo = ValueList.size(); 1550 BasicBlock *CurBB = 0; 1551 unsigned CurBBNo = 0; 1552 1553 // Read all the records. 1554 SmallVector<uint64_t, 64> Record; 1555 while (1) { 1556 unsigned Code = Stream.ReadCode(); 1557 if (Code == bitc::END_BLOCK) { 1558 if (Stream.ReadBlockEnd()) 1559 return Error("Error at end of function block"); 1560 break; 1561 } 1562 1563 if (Code == bitc::ENTER_SUBBLOCK) { 1564 switch (Stream.ReadSubBlockID()) { 1565 default: // Skip unknown content. 1566 if (Stream.SkipBlock()) 1567 return Error("Malformed block record"); 1568 break; 1569 case bitc::CONSTANTS_BLOCK_ID: 1570 if (ParseConstants()) return true; 1571 NextValueNo = ValueList.size(); 1572 break; 1573 case bitc::VALUE_SYMTAB_BLOCK_ID: 1574 if (ParseValueSymbolTable()) return true; 1575 break; 1576 } 1577 continue; 1578 } 1579 1580 if (Code == bitc::DEFINE_ABBREV) { 1581 Stream.ReadAbbrevRecord(); 1582 continue; 1583 } 1584 1585 // Read a record. 1586 Record.clear(); 1587 Instruction *I = 0; 1588 unsigned BitCode = Stream.ReadRecord(Code, Record); 1589 switch (BitCode) { 1590 default: // Default behavior: reject 1591 return Error("Unknown instruction"); 1592 case bitc::FUNC_CODE_DECLAREBLOCKS: // DECLAREBLOCKS: [nblocks] 1593 if (Record.size() < 1 || Record[0] == 0) 1594 return Error("Invalid DECLAREBLOCKS record"); 1595 // Create all the basic blocks for the function. 1596 FunctionBBs.resize(Record[0]); 1597 for (unsigned i = 0, e = FunctionBBs.size(); i != e; ++i) 1598 FunctionBBs[i] = BasicBlock::Create(Context, "", F); 1599 CurBB = FunctionBBs[0]; 1600 continue; 1601 1602 case bitc::FUNC_CODE_INST_BINOP: { // BINOP: [opval, ty, opval, opcode] 1603 unsigned OpNum = 0; 1604 Value *LHS, *RHS; 1605 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) || 1606 getValue(Record, OpNum, LHS->getType(), RHS) || 1607 OpNum+1 > Record.size()) 1608 return Error("Invalid BINOP record"); 1609 1610 int Opc = GetDecodedBinaryOpcode(Record[OpNum++], LHS->getType()); 1611 if (Opc == -1) return Error("Invalid BINOP record"); 1612 I = BinaryOperator::Create((Instruction::BinaryOps)Opc, LHS, RHS); 1613 if (OpNum < Record.size()) 1614 SetOptimizationFlags(I, Record[3]); 1615 break; 1616 } 1617 case bitc::FUNC_CODE_INST_CAST: { // CAST: [opval, opty, destty, castopc] 1618 unsigned OpNum = 0; 1619 Value *Op; 1620 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1621 OpNum+2 != Record.size()) 1622 return Error("Invalid CAST record"); 1623 1624 const Type *ResTy = getTypeByID(Record[OpNum]); 1625 int Opc = GetDecodedCastOpcode(Record[OpNum+1]); 1626 if (Opc == -1 || ResTy == 0) 1627 return Error("Invalid CAST record"); 1628 I = CastInst::Create((Instruction::CastOps)Opc, Op, ResTy); 1629 break; 1630 } 1631 case bitc::FUNC_CODE_INST_INBOUNDS_GEP: 1632 case bitc::FUNC_CODE_INST_GEP: { // GEP: [n x operands] 1633 unsigned OpNum = 0; 1634 Value *BasePtr; 1635 if (getValueTypePair(Record, OpNum, NextValueNo, BasePtr)) 1636 return Error("Invalid GEP record"); 1637 1638 SmallVector<Value*, 16> GEPIdx; 1639 while (OpNum != Record.size()) { 1640 Value *Op; 1641 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 1642 return Error("Invalid GEP record"); 1643 GEPIdx.push_back(Op); 1644 } 1645 1646 I = GetElementPtrInst::Create(BasePtr, GEPIdx.begin(), GEPIdx.end()); 1647 if (BitCode == bitc::FUNC_CODE_INST_INBOUNDS_GEP) 1648 cast<GEPOperator>(I)->setIsInBounds(true); 1649 break; 1650 } 1651 1652 case bitc::FUNC_CODE_INST_EXTRACTVAL: { 1653 // EXTRACTVAL: [opty, opval, n x indices] 1654 unsigned OpNum = 0; 1655 Value *Agg; 1656 if (getValueTypePair(Record, OpNum, NextValueNo, Agg)) 1657 return Error("Invalid EXTRACTVAL record"); 1658 1659 SmallVector<unsigned, 4> EXTRACTVALIdx; 1660 for (unsigned RecSize = Record.size(); 1661 OpNum != RecSize; ++OpNum) { 1662 uint64_t Index = Record[OpNum]; 1663 if ((unsigned)Index != Index) 1664 return Error("Invalid EXTRACTVAL index"); 1665 EXTRACTVALIdx.push_back((unsigned)Index); 1666 } 1667 1668 I = ExtractValueInst::Create(Agg, 1669 EXTRACTVALIdx.begin(), EXTRACTVALIdx.end()); 1670 break; 1671 } 1672 1673 case bitc::FUNC_CODE_INST_INSERTVAL: { 1674 // INSERTVAL: [opty, opval, opty, opval, n x indices] 1675 unsigned OpNum = 0; 1676 Value *Agg; 1677 if (getValueTypePair(Record, OpNum, NextValueNo, Agg)) 1678 return Error("Invalid INSERTVAL record"); 1679 Value *Val; 1680 if (getValueTypePair(Record, OpNum, NextValueNo, Val)) 1681 return Error("Invalid INSERTVAL record"); 1682 1683 SmallVector<unsigned, 4> INSERTVALIdx; 1684 for (unsigned RecSize = Record.size(); 1685 OpNum != RecSize; ++OpNum) { 1686 uint64_t Index = Record[OpNum]; 1687 if ((unsigned)Index != Index) 1688 return Error("Invalid INSERTVAL index"); 1689 INSERTVALIdx.push_back((unsigned)Index); 1690 } 1691 1692 I = InsertValueInst::Create(Agg, Val, 1693 INSERTVALIdx.begin(), INSERTVALIdx.end()); 1694 break; 1695 } 1696 1697 case bitc::FUNC_CODE_INST_SELECT: { // SELECT: [opval, ty, opval, opval] 1698 // obsolete form of select 1699 // handles select i1 ... in old bitcode 1700 unsigned OpNum = 0; 1701 Value *TrueVal, *FalseVal, *Cond; 1702 if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) || 1703 getValue(Record, OpNum, TrueVal->getType(), FalseVal) || 1704 getValue(Record, OpNum, Type::getInt1Ty(Context), Cond)) 1705 return Error("Invalid SELECT record"); 1706 1707 I = SelectInst::Create(Cond, TrueVal, FalseVal); 1708 break; 1709 } 1710 1711 case bitc::FUNC_CODE_INST_VSELECT: {// VSELECT: [ty,opval,opval,predty,pred] 1712 // new form of select 1713 // handles select i1 or select [N x i1] 1714 unsigned OpNum = 0; 1715 Value *TrueVal, *FalseVal, *Cond; 1716 if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) || 1717 getValue(Record, OpNum, TrueVal->getType(), FalseVal) || 1718 getValueTypePair(Record, OpNum, NextValueNo, Cond)) 1719 return Error("Invalid SELECT record"); 1720 1721 // select condition can be either i1 or [N x i1] 1722 if (const VectorType* vector_type = 1723 dyn_cast<const VectorType>(Cond->getType())) { 1724 // expect <n x i1> 1725 if (vector_type->getElementType() != Type::getInt1Ty(Context)) 1726 return Error("Invalid SELECT condition type"); 1727 } else { 1728 // expect i1 1729 if (Cond->getType() != Type::getInt1Ty(Context)) 1730 return Error("Invalid SELECT condition type"); 1731 } 1732 1733 I = SelectInst::Create(Cond, TrueVal, FalseVal); 1734 break; 1735 } 1736 1737 case bitc::FUNC_CODE_INST_EXTRACTELT: { // EXTRACTELT: [opty, opval, opval] 1738 unsigned OpNum = 0; 1739 Value *Vec, *Idx; 1740 if (getValueTypePair(Record, OpNum, NextValueNo, Vec) || 1741 getValue(Record, OpNum, Type::getInt32Ty(Context), Idx)) 1742 return Error("Invalid EXTRACTELT record"); 1743 I = ExtractElementInst::Create(Vec, Idx); 1744 break; 1745 } 1746 1747 case bitc::FUNC_CODE_INST_INSERTELT: { // INSERTELT: [ty, opval,opval,opval] 1748 unsigned OpNum = 0; 1749 Value *Vec, *Elt, *Idx; 1750 if (getValueTypePair(Record, OpNum, NextValueNo, Vec) || 1751 getValue(Record, OpNum, 1752 cast<VectorType>(Vec->getType())->getElementType(), Elt) || 1753 getValue(Record, OpNum, Type::getInt32Ty(Context), Idx)) 1754 return Error("Invalid INSERTELT record"); 1755 I = InsertElementInst::Create(Vec, Elt, Idx); 1756 break; 1757 } 1758 1759 case bitc::FUNC_CODE_INST_SHUFFLEVEC: {// SHUFFLEVEC: [opval,ty,opval,opval] 1760 unsigned OpNum = 0; 1761 Value *Vec1, *Vec2, *Mask; 1762 if (getValueTypePair(Record, OpNum, NextValueNo, Vec1) || 1763 getValue(Record, OpNum, Vec1->getType(), Vec2)) 1764 return Error("Invalid SHUFFLEVEC record"); 1765 1766 if (getValueTypePair(Record, OpNum, NextValueNo, Mask)) 1767 return Error("Invalid SHUFFLEVEC record"); 1768 I = new ShuffleVectorInst(Vec1, Vec2, Mask); 1769 break; 1770 } 1771 1772 case bitc::FUNC_CODE_INST_CMP: // CMP: [opty, opval, opval, pred] 1773 // Old form of ICmp/FCmp returning bool 1774 // Existed to differentiate between icmp/fcmp and vicmp/vfcmp which were 1775 // both legal on vectors but had different behaviour. 1776 case bitc::FUNC_CODE_INST_CMP2: { // CMP2: [opty, opval, opval, pred] 1777 // FCmp/ICmp returning bool or vector of bool 1778 1779 unsigned OpNum = 0; 1780 Value *LHS, *RHS; 1781 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) || 1782 getValue(Record, OpNum, LHS->getType(), RHS) || 1783 OpNum+1 != Record.size()) 1784 return Error("Invalid CMP record"); 1785 1786 if (LHS->getType()->isFPOrFPVector()) 1787 I = new FCmpInst((FCmpInst::Predicate)Record[OpNum], LHS, RHS); 1788 else 1789 I = new ICmpInst((ICmpInst::Predicate)Record[OpNum], LHS, RHS); 1790 break; 1791 } 1792 1793 case bitc::FUNC_CODE_INST_GETRESULT: { // GETRESULT: [ty, val, n] 1794 if (Record.size() != 2) 1795 return Error("Invalid GETRESULT record"); 1796 unsigned OpNum = 0; 1797 Value *Op; 1798 getValueTypePair(Record, OpNum, NextValueNo, Op); 1799 unsigned Index = Record[1]; 1800 I = ExtractValueInst::Create(Op, Index); 1801 break; 1802 } 1803 1804 case bitc::FUNC_CODE_INST_RET: // RET: [opty,opval<optional>] 1805 { 1806 unsigned Size = Record.size(); 1807 if (Size == 0) { 1808 I = ReturnInst::Create(Context); 1809 break; 1810 } 1811 1812 unsigned OpNum = 0; 1813 SmallVector<Value *,4> Vs; 1814 do { 1815 Value *Op = NULL; 1816 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 1817 return Error("Invalid RET record"); 1818 Vs.push_back(Op); 1819 } while(OpNum != Record.size()); 1820 1821 const Type *ReturnType = F->getReturnType(); 1822 if (Vs.size() > 1 || 1823 (isa<StructType>(ReturnType) && 1824 (Vs.empty() || Vs[0]->getType() != ReturnType))) { 1825 Value *RV = UndefValue::get(ReturnType); 1826 for (unsigned i = 0, e = Vs.size(); i != e; ++i) { 1827 I = InsertValueInst::Create(RV, Vs[i], i, "mrv"); 1828 CurBB->getInstList().push_back(I); 1829 ValueList.AssignValue(I, NextValueNo++); 1830 RV = I; 1831 } 1832 I = ReturnInst::Create(Context, RV); 1833 break; 1834 } 1835 1836 I = ReturnInst::Create(Context, Vs[0]); 1837 break; 1838 } 1839 case bitc::FUNC_CODE_INST_BR: { // BR: [bb#, bb#, opval] or [bb#] 1840 if (Record.size() != 1 && Record.size() != 3) 1841 return Error("Invalid BR record"); 1842 BasicBlock *TrueDest = getBasicBlock(Record[0]); 1843 if (TrueDest == 0) 1844 return Error("Invalid BR record"); 1845 1846 if (Record.size() == 1) 1847 I = BranchInst::Create(TrueDest); 1848 else { 1849 BasicBlock *FalseDest = getBasicBlock(Record[1]); 1850 Value *Cond = getFnValueByID(Record[2], Type::getInt1Ty(Context)); 1851 if (FalseDest == 0 || Cond == 0) 1852 return Error("Invalid BR record"); 1853 I = BranchInst::Create(TrueDest, FalseDest, Cond); 1854 } 1855 break; 1856 } 1857 case bitc::FUNC_CODE_INST_SWITCH: { // SWITCH: [opty, opval, n, n x ops] 1858 if (Record.size() < 3 || (Record.size() & 1) == 0) 1859 return Error("Invalid SWITCH record"); 1860 const Type *OpTy = getTypeByID(Record[0]); 1861 Value *Cond = getFnValueByID(Record[1], OpTy); 1862 BasicBlock *Default = getBasicBlock(Record[2]); 1863 if (OpTy == 0 || Cond == 0 || Default == 0) 1864 return Error("Invalid SWITCH record"); 1865 unsigned NumCases = (Record.size()-3)/2; 1866 SwitchInst *SI = SwitchInst::Create(Cond, Default, NumCases); 1867 for (unsigned i = 0, e = NumCases; i != e; ++i) { 1868 ConstantInt *CaseVal = 1869 dyn_cast_or_null<ConstantInt>(getFnValueByID(Record[3+i*2], OpTy)); 1870 BasicBlock *DestBB = getBasicBlock(Record[1+3+i*2]); 1871 if (CaseVal == 0 || DestBB == 0) { 1872 delete SI; 1873 return Error("Invalid SWITCH record!"); 1874 } 1875 SI->addCase(CaseVal, DestBB); 1876 } 1877 I = SI; 1878 break; 1879 } 1880 1881 case bitc::FUNC_CODE_INST_INVOKE: { 1882 // INVOKE: [attrs, cc, normBB, unwindBB, fnty, op0,op1,op2, ...] 1883 if (Record.size() < 4) return Error("Invalid INVOKE record"); 1884 AttrListPtr PAL = getAttributes(Record[0]); 1885 unsigned CCInfo = Record[1]; 1886 BasicBlock *NormalBB = getBasicBlock(Record[2]); 1887 BasicBlock *UnwindBB = getBasicBlock(Record[3]); 1888 1889 unsigned OpNum = 4; 1890 Value *Callee; 1891 if (getValueTypePair(Record, OpNum, NextValueNo, Callee)) 1892 return Error("Invalid INVOKE record"); 1893 1894 const PointerType *CalleeTy = dyn_cast<PointerType>(Callee->getType()); 1895 const FunctionType *FTy = !CalleeTy ? 0 : 1896 dyn_cast<FunctionType>(CalleeTy->getElementType()); 1897 1898 // Check that the right number of fixed parameters are here. 1899 if (FTy == 0 || NormalBB == 0 || UnwindBB == 0 || 1900 Record.size() < OpNum+FTy->getNumParams()) 1901 return Error("Invalid INVOKE record"); 1902 1903 SmallVector<Value*, 16> Ops; 1904 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) { 1905 Ops.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i))); 1906 if (Ops.back() == 0) return Error("Invalid INVOKE record"); 1907 } 1908 1909 if (!FTy->isVarArg()) { 1910 if (Record.size() != OpNum) 1911 return Error("Invalid INVOKE record"); 1912 } else { 1913 // Read type/value pairs for varargs params. 1914 while (OpNum != Record.size()) { 1915 Value *Op; 1916 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 1917 return Error("Invalid INVOKE record"); 1918 Ops.push_back(Op); 1919 } 1920 } 1921 1922 I = InvokeInst::Create(Callee, NormalBB, UnwindBB, 1923 Ops.begin(), Ops.end()); 1924 cast<InvokeInst>(I)->setCallingConv( 1925 static_cast<CallingConv::ID>(CCInfo)); 1926 cast<InvokeInst>(I)->setAttributes(PAL); 1927 break; 1928 } 1929 case bitc::FUNC_CODE_INST_UNWIND: // UNWIND 1930 I = new UnwindInst(Context); 1931 break; 1932 case bitc::FUNC_CODE_INST_UNREACHABLE: // UNREACHABLE 1933 I = new UnreachableInst(Context); 1934 break; 1935 case bitc::FUNC_CODE_INST_PHI: { // PHI: [ty, val0,bb0, ...] 1936 if (Record.size() < 1 || ((Record.size()-1)&1)) 1937 return Error("Invalid PHI record"); 1938 const Type *Ty = getTypeByID(Record[0]); 1939 if (!Ty) return Error("Invalid PHI record"); 1940 1941 PHINode *PN = PHINode::Create(Ty); 1942 PN->reserveOperandSpace((Record.size()-1)/2); 1943 1944 for (unsigned i = 0, e = Record.size()-1; i != e; i += 2) { 1945 Value *V = getFnValueByID(Record[1+i], Ty); 1946 BasicBlock *BB = getBasicBlock(Record[2+i]); 1947 if (!V || !BB) return Error("Invalid PHI record"); 1948 PN->addIncoming(V, BB); 1949 } 1950 I = PN; 1951 break; 1952 } 1953 1954 case bitc::FUNC_CODE_INST_MALLOC: { // MALLOC: [instty, op, align] 1955 if (Record.size() < 3) 1956 return Error("Invalid MALLOC record"); 1957 const PointerType *Ty = 1958 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1959 Value *Size = getFnValueByID(Record[1], Type::getInt32Ty(Context)); 1960 unsigned Align = Record[2]; 1961 if (!Ty || !Size) return Error("Invalid MALLOC record"); 1962 I = new MallocInst(Ty->getElementType(), Size, (1 << Align) >> 1); 1963 break; 1964 } 1965 case bitc::FUNC_CODE_INST_FREE: { // FREE: [op, opty] 1966 unsigned OpNum = 0; 1967 Value *Op; 1968 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1969 OpNum != Record.size()) 1970 return Error("Invalid FREE record"); 1971 I = new FreeInst(Op); 1972 break; 1973 } 1974 case bitc::FUNC_CODE_INST_ALLOCA: { // ALLOCA: [instty, op, align] 1975 if (Record.size() < 3) 1976 return Error("Invalid ALLOCA record"); 1977 const PointerType *Ty = 1978 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1979 Value *Size = getFnValueByID(Record[1], Type::getInt32Ty(Context)); 1980 unsigned Align = Record[2]; 1981 if (!Ty || !Size) return Error("Invalid ALLOCA record"); 1982 I = new AllocaInst(Ty->getElementType(), Size, (1 << Align) >> 1); 1983 break; 1984 } 1985 case bitc::FUNC_CODE_INST_LOAD: { // LOAD: [opty, op, align, vol] 1986 unsigned OpNum = 0; 1987 Value *Op; 1988 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1989 OpNum+2 != Record.size()) 1990 return Error("Invalid LOAD record"); 1991 1992 I = new LoadInst(Op, "", Record[OpNum+1], (1 << Record[OpNum]) >> 1); 1993 break; 1994 } 1995 case bitc::FUNC_CODE_INST_STORE2: { // STORE2:[ptrty, ptr, val, align, vol] 1996 unsigned OpNum = 0; 1997 Value *Val, *Ptr; 1998 if (getValueTypePair(Record, OpNum, NextValueNo, Ptr) || 1999 getValue(Record, OpNum, 2000 cast<PointerType>(Ptr->getType())->getElementType(), Val) || 2001 OpNum+2 != Record.size()) 2002 return Error("Invalid STORE record"); 2003 2004 I = new StoreInst(Val, Ptr, Record[OpNum+1], (1 << Record[OpNum]) >> 1); 2005 break; 2006 } 2007 case bitc::FUNC_CODE_INST_STORE: { // STORE:[val, valty, ptr, align, vol] 2008 // FIXME: Legacy form of store instruction. Should be removed in LLVM 3.0. 2009 unsigned OpNum = 0; 2010 Value *Val, *Ptr; 2011 if (getValueTypePair(Record, OpNum, NextValueNo, Val) || 2012 getValue(Record, OpNum, 2013 PointerType::getUnqual(Val->getType()), Ptr)|| 2014 OpNum+2 != Record.size()) 2015 return Error("Invalid STORE record"); 2016 2017 I = new StoreInst(Val, Ptr, Record[OpNum+1], (1 << Record[OpNum]) >> 1); 2018 break; 2019 } 2020 case bitc::FUNC_CODE_INST_CALL: { 2021 // CALL: [paramattrs, cc, fnty, fnid, arg0, arg1...] 2022 if (Record.size() < 3) 2023 return Error("Invalid CALL record"); 2024 2025 AttrListPtr PAL = getAttributes(Record[0]); 2026 unsigned CCInfo = Record[1]; 2027 2028 unsigned OpNum = 2; 2029 Value *Callee; 2030 if (getValueTypePair(Record, OpNum, NextValueNo, Callee)) 2031 return Error("Invalid CALL record"); 2032 2033 const PointerType *OpTy = dyn_cast<PointerType>(Callee->getType()); 2034 const FunctionType *FTy = 0; 2035 if (OpTy) FTy = dyn_cast<FunctionType>(OpTy->getElementType()); 2036 if (!FTy || Record.size() < FTy->getNumParams()+OpNum) 2037 return Error("Invalid CALL record"); 2038 2039 SmallVector<Value*, 16> Args; 2040 // Read the fixed params. 2041 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) { 2042 if (FTy->getParamType(i)->getTypeID()==Type::LabelTyID) 2043 Args.push_back(getBasicBlock(Record[OpNum])); 2044 else 2045 Args.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i))); 2046 if (Args.back() == 0) return Error("Invalid CALL record"); 2047 } 2048 2049 // Read type/value pairs for varargs params. 2050 if (!FTy->isVarArg()) { 2051 if (OpNum != Record.size()) 2052 return Error("Invalid CALL record"); 2053 } else { 2054 while (OpNum != Record.size()) { 2055 Value *Op; 2056 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 2057 return Error("Invalid CALL record"); 2058 Args.push_back(Op); 2059 } 2060 } 2061 2062 I = CallInst::Create(Callee, Args.begin(), Args.end()); 2063 cast<CallInst>(I)->setCallingConv( 2064 static_cast<CallingConv::ID>(CCInfo>>1)); 2065 cast<CallInst>(I)->setTailCall(CCInfo & 1); 2066 cast<CallInst>(I)->setAttributes(PAL); 2067 break; 2068 } 2069 case bitc::FUNC_CODE_INST_VAARG: { // VAARG: [valistty, valist, instty] 2070 if (Record.size() < 3) 2071 return Error("Invalid VAARG record"); 2072 const Type *OpTy = getTypeByID(Record[0]); 2073 Value *Op = getFnValueByID(Record[1], OpTy); 2074 const Type *ResTy = getTypeByID(Record[2]); 2075 if (!OpTy || !Op || !ResTy) 2076 return Error("Invalid VAARG record"); 2077 I = new VAArgInst(Op, ResTy); 2078 break; 2079 } 2080 } 2081 2082 // Add instruction to end of current BB. If there is no current BB, reject 2083 // this file. 2084 if (CurBB == 0) { 2085 delete I; 2086 return Error("Invalid instruction with no BB"); 2087 } 2088 CurBB->getInstList().push_back(I); 2089 2090 // If this was a terminator instruction, move to the next block. 2091 if (isa<TerminatorInst>(I)) { 2092 ++CurBBNo; 2093 CurBB = CurBBNo < FunctionBBs.size() ? FunctionBBs[CurBBNo] : 0; 2094 } 2095 2096 // Non-void values get registered in the value table for future use. 2097 if (I && I->getType() != Type::getVoidTy(Context)) 2098 ValueList.AssignValue(I, NextValueNo++); 2099 } 2100 2101 // Check the function list for unresolved values. 2102 if (Argument *A = dyn_cast<Argument>(ValueList.back())) { 2103 if (A->getParent() == 0) { 2104 // We found at least one unresolved value. Nuke them all to avoid leaks. 2105 for (unsigned i = ModuleValueListSize, e = ValueList.size(); i != e; ++i){ 2106 if ((A = dyn_cast<Argument>(ValueList.back())) && A->getParent() == 0) { 2107 A->replaceAllUsesWith(UndefValue::get(A->getType())); 2108 delete A; 2109 } 2110 } 2111 return Error("Never resolved value found in function!"); 2112 } 2113 } 2114 2115 // Trim the value list down to the size it was before we parsed this function. 2116 ValueList.shrinkTo(ModuleValueListSize); 2117 std::vector<BasicBlock*>().swap(FunctionBBs); 2118 2119 return false; 2120} 2121 2122//===----------------------------------------------------------------------===// 2123// ModuleProvider implementation 2124//===----------------------------------------------------------------------===// 2125 2126 2127bool BitcodeReader::materializeFunction(Function *F, std::string *ErrInfo) { 2128 // If it already is material, ignore the request. 2129 if (!F->hasNotBeenReadFromBitcode()) return false; 2130 2131 DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator DFII = 2132 DeferredFunctionInfo.find(F); 2133 assert(DFII != DeferredFunctionInfo.end() && "Deferred function not found!"); 2134 2135 // Move the bit stream to the saved position of the deferred function body and 2136 // restore the real linkage type for the function. 2137 Stream.JumpToBit(DFII->second.first); 2138 F->setLinkage((GlobalValue::LinkageTypes)DFII->second.second); 2139 2140 if (ParseFunctionBody(F)) { 2141 if (ErrInfo) *ErrInfo = ErrorString; 2142 return true; 2143 } 2144 2145 // Upgrade any old intrinsic calls in the function. 2146 for (UpgradedIntrinsicMap::iterator I = UpgradedIntrinsics.begin(), 2147 E = UpgradedIntrinsics.end(); I != E; ++I) { 2148 if (I->first != I->second) { 2149 for (Value::use_iterator UI = I->first->use_begin(), 2150 UE = I->first->use_end(); UI != UE; ) { 2151 if (CallInst* CI = dyn_cast<CallInst>(*UI++)) 2152 UpgradeIntrinsicCall(CI, I->second); 2153 } 2154 } 2155 } 2156 2157 return false; 2158} 2159 2160void BitcodeReader::dematerializeFunction(Function *F) { 2161 // If this function isn't materialized, or if it is a proto, this is a noop. 2162 if (F->hasNotBeenReadFromBitcode() || F->isDeclaration()) 2163 return; 2164 2165 assert(DeferredFunctionInfo.count(F) && "No info to read function later?"); 2166 2167 // Just forget the function body, we can remat it later. 2168 F->deleteBody(); 2169 F->setLinkage(GlobalValue::GhostLinkage); 2170} 2171 2172 2173Module *BitcodeReader::materializeModule(std::string *ErrInfo) { 2174 // Iterate over the module, deserializing any functions that are still on 2175 // disk. 2176 for (Module::iterator F = TheModule->begin(), E = TheModule->end(); 2177 F != E; ++F) 2178 if (F->hasNotBeenReadFromBitcode() && 2179 materializeFunction(F, ErrInfo)) 2180 return 0; 2181 2182 // Upgrade any intrinsic calls that slipped through (should not happen!) and 2183 // delete the old functions to clean up. We can't do this unless the entire 2184 // module is materialized because there could always be another function body 2185 // with calls to the old function. 2186 for (std::vector<std::pair<Function*, Function*> >::iterator I = 2187 UpgradedIntrinsics.begin(), E = UpgradedIntrinsics.end(); I != E; ++I) { 2188 if (I->first != I->second) { 2189 for (Value::use_iterator UI = I->first->use_begin(), 2190 UE = I->first->use_end(); UI != UE; ) { 2191 if (CallInst* CI = dyn_cast<CallInst>(*UI++)) 2192 UpgradeIntrinsicCall(CI, I->second); 2193 } 2194 if (!I->first->use_empty()) 2195 I->first->replaceAllUsesWith(I->second); 2196 I->first->eraseFromParent(); 2197 } 2198 } 2199 std::vector<std::pair<Function*, Function*> >().swap(UpgradedIntrinsics); 2200 2201 // Check debug info intrinsics. 2202 CheckDebugInfoIntrinsics(TheModule); 2203 2204 return TheModule; 2205} 2206 2207 2208/// This method is provided by the parent ModuleProvde class and overriden 2209/// here. It simply releases the module from its provided and frees up our 2210/// state. 2211/// @brief Release our hold on the generated module 2212Module *BitcodeReader::releaseModule(std::string *ErrInfo) { 2213 // Since we're losing control of this Module, we must hand it back complete 2214 Module *M = ModuleProvider::releaseModule(ErrInfo); 2215 FreeState(); 2216 return M; 2217} 2218 2219 2220//===----------------------------------------------------------------------===// 2221// External interface 2222//===----------------------------------------------------------------------===// 2223 2224/// getBitcodeModuleProvider - lazy function-at-a-time loading from a file. 2225/// 2226ModuleProvider *llvm::getBitcodeModuleProvider(MemoryBuffer *Buffer, 2227 LLVMContext& Context, 2228 std::string *ErrMsg) { 2229 BitcodeReader *R = new BitcodeReader(Buffer, Context); 2230 if (R->ParseBitcode()) { 2231 if (ErrMsg) 2232 *ErrMsg = R->getErrorString(); 2233 2234 // Don't let the BitcodeReader dtor delete 'Buffer'. 2235 R->releaseMemoryBuffer(); 2236 delete R; 2237 return 0; 2238 } 2239 return R; 2240} 2241 2242/// ParseBitcodeFile - Read the specified bitcode file, returning the module. 2243/// If an error occurs, return null and fill in *ErrMsg if non-null. 2244Module *llvm::ParseBitcodeFile(MemoryBuffer *Buffer, LLVMContext& Context, 2245 std::string *ErrMsg){ 2246 BitcodeReader *R; 2247 R = static_cast<BitcodeReader*>(getBitcodeModuleProvider(Buffer, Context, 2248 ErrMsg)); 2249 if (!R) return 0; 2250 2251 // Read in the entire module. 2252 Module *M = R->materializeModule(ErrMsg); 2253 2254 // Don't let the BitcodeReader dtor delete 'Buffer', regardless of whether 2255 // there was an error. 2256 R->releaseMemoryBuffer(); 2257 2258 // If there was no error, tell ModuleProvider not to delete it when its dtor 2259 // is run. 2260 if (M) 2261 M = R->releaseModule(ErrMsg); 2262 2263 delete R; 2264 return M; 2265} 2266