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/Module.h" 21 #include "llvm/Operator.h" 22 #include "llvm/AutoUpgrade.h" 23 #include "llvm/ADT/SmallString.h" 24 #include "llvm/ADT/SmallVector.h" 25 #include "llvm/Support/DataStream.h" 26 #include "llvm/Support/MathExtras.h" 27 #include "llvm/Support/MemoryBuffer.h" 28 #include "llvm/OperandTraits.h" 29 using namespace llvm; 30 31 enum { 32 SWITCH_INST_MAGIC = 0x4B5 // May 2012 => 1205 => Hex 33 }; 34 35 void BitcodeReader::materializeForwardReferencedFunctions() { 36 while (!BlockAddrFwdRefs.empty()) { 37 Function *F = BlockAddrFwdRefs.begin()->first; 38 F->Materialize(); 39 } 40 } 41 42 void BitcodeReader::FreeState() { 43 if (BufferOwned) 44 delete Buffer; 45 Buffer = 0; 46 std::vector<Type*>().swap(TypeList); 47 ValueList.clear(); 48 MDValueList.clear(); 49 50 std::vector<AttrListPtr>().swap(MAttributes); 51 std::vector<BasicBlock*>().swap(FunctionBBs); 52 std::vector<Function*>().swap(FunctionsWithBodies); 53 DeferredFunctionInfo.clear(); 54 MDKindMap.clear(); 55 } 56 57 //===----------------------------------------------------------------------===// 58 // Helper functions to implement forward reference resolution, etc. 59 //===----------------------------------------------------------------------===// 60 61 /// ConvertToString - Convert a string from a record into an std::string, return 62 /// true on failure. 63 template<typename StrTy> 64 static bool ConvertToString(ArrayRef<uint64_t> Record, unsigned Idx, 65 StrTy &Result) { 66 if (Idx > Record.size()) 67 return true; 68 69 for (unsigned i = Idx, e = Record.size(); i != e; ++i) 70 Result += (char)Record[i]; 71 return false; 72 } 73 74 static GlobalValue::LinkageTypes GetDecodedLinkage(unsigned Val) { 75 switch (Val) { 76 default: // Map unknown/new linkages to external 77 case 0: return GlobalValue::ExternalLinkage; 78 case 1: return GlobalValue::WeakAnyLinkage; 79 case 2: return GlobalValue::AppendingLinkage; 80 case 3: return GlobalValue::InternalLinkage; 81 case 4: return GlobalValue::LinkOnceAnyLinkage; 82 case 5: return GlobalValue::DLLImportLinkage; 83 case 6: return GlobalValue::DLLExportLinkage; 84 case 7: return GlobalValue::ExternalWeakLinkage; 85 case 8: return GlobalValue::CommonLinkage; 86 case 9: return GlobalValue::PrivateLinkage; 87 case 10: return GlobalValue::WeakODRLinkage; 88 case 11: return GlobalValue::LinkOnceODRLinkage; 89 case 12: return GlobalValue::AvailableExternallyLinkage; 90 case 13: return GlobalValue::LinkerPrivateLinkage; 91 case 14: return GlobalValue::LinkerPrivateWeakLinkage; 92 case 15: return GlobalValue::LinkOnceODRAutoHideLinkage; 93 } 94 } 95 96 static GlobalValue::VisibilityTypes GetDecodedVisibility(unsigned Val) { 97 switch (Val) { 98 default: // Map unknown visibilities to default. 99 case 0: return GlobalValue::DefaultVisibility; 100 case 1: return GlobalValue::HiddenVisibility; 101 case 2: return GlobalValue::ProtectedVisibility; 102 } 103 } 104 105 static GlobalVariable::ThreadLocalMode GetDecodedThreadLocalMode(unsigned Val) { 106 switch (Val) { 107 case 0: return GlobalVariable::NotThreadLocal; 108 default: // Map unknown non-zero value to general dynamic. 109 case 1: return GlobalVariable::GeneralDynamicTLSModel; 110 case 2: return GlobalVariable::LocalDynamicTLSModel; 111 case 3: return GlobalVariable::InitialExecTLSModel; 112 case 4: return GlobalVariable::LocalExecTLSModel; 113 } 114 } 115 116 static int GetDecodedCastOpcode(unsigned Val) { 117 switch (Val) { 118 default: return -1; 119 case bitc::CAST_TRUNC : return Instruction::Trunc; 120 case bitc::CAST_ZEXT : return Instruction::ZExt; 121 case bitc::CAST_SEXT : return Instruction::SExt; 122 case bitc::CAST_FPTOUI : return Instruction::FPToUI; 123 case bitc::CAST_FPTOSI : return Instruction::FPToSI; 124 case bitc::CAST_UITOFP : return Instruction::UIToFP; 125 case bitc::CAST_SITOFP : return Instruction::SIToFP; 126 case bitc::CAST_FPTRUNC : return Instruction::FPTrunc; 127 case bitc::CAST_FPEXT : return Instruction::FPExt; 128 case bitc::CAST_PTRTOINT: return Instruction::PtrToInt; 129 case bitc::CAST_INTTOPTR: return Instruction::IntToPtr; 130 case bitc::CAST_BITCAST : return Instruction::BitCast; 131 } 132 } 133 static int GetDecodedBinaryOpcode(unsigned Val, Type *Ty) { 134 switch (Val) { 135 default: return -1; 136 case bitc::BINOP_ADD: 137 return Ty->isFPOrFPVectorTy() ? Instruction::FAdd : Instruction::Add; 138 case bitc::BINOP_SUB: 139 return Ty->isFPOrFPVectorTy() ? Instruction::FSub : Instruction::Sub; 140 case bitc::BINOP_MUL: 141 return Ty->isFPOrFPVectorTy() ? Instruction::FMul : Instruction::Mul; 142 case bitc::BINOP_UDIV: return Instruction::UDiv; 143 case bitc::BINOP_SDIV: 144 return Ty->isFPOrFPVectorTy() ? Instruction::FDiv : Instruction::SDiv; 145 case bitc::BINOP_UREM: return Instruction::URem; 146 case bitc::BINOP_SREM: 147 return Ty->isFPOrFPVectorTy() ? Instruction::FRem : Instruction::SRem; 148 case bitc::BINOP_SHL: return Instruction::Shl; 149 case bitc::BINOP_LSHR: return Instruction::LShr; 150 case bitc::BINOP_ASHR: return Instruction::AShr; 151 case bitc::BINOP_AND: return Instruction::And; 152 case bitc::BINOP_OR: return Instruction::Or; 153 case bitc::BINOP_XOR: return Instruction::Xor; 154 } 155 } 156 157 static AtomicRMWInst::BinOp GetDecodedRMWOperation(unsigned Val) { 158 switch (Val) { 159 default: return AtomicRMWInst::BAD_BINOP; 160 case bitc::RMW_XCHG: return AtomicRMWInst::Xchg; 161 case bitc::RMW_ADD: return AtomicRMWInst::Add; 162 case bitc::RMW_SUB: return AtomicRMWInst::Sub; 163 case bitc::RMW_AND: return AtomicRMWInst::And; 164 case bitc::RMW_NAND: return AtomicRMWInst::Nand; 165 case bitc::RMW_OR: return AtomicRMWInst::Or; 166 case bitc::RMW_XOR: return AtomicRMWInst::Xor; 167 case bitc::RMW_MAX: return AtomicRMWInst::Max; 168 case bitc::RMW_MIN: return AtomicRMWInst::Min; 169 case bitc::RMW_UMAX: return AtomicRMWInst::UMax; 170 case bitc::RMW_UMIN: return AtomicRMWInst::UMin; 171 } 172 } 173 174 static AtomicOrdering GetDecodedOrdering(unsigned Val) { 175 switch (Val) { 176 case bitc::ORDERING_NOTATOMIC: return NotAtomic; 177 case bitc::ORDERING_UNORDERED: return Unordered; 178 case bitc::ORDERING_MONOTONIC: return Monotonic; 179 case bitc::ORDERING_ACQUIRE: return Acquire; 180 case bitc::ORDERING_RELEASE: return Release; 181 case bitc::ORDERING_ACQREL: return AcquireRelease; 182 default: // Map unknown orderings to sequentially-consistent. 183 case bitc::ORDERING_SEQCST: return SequentiallyConsistent; 184 } 185 } 186 187 static SynchronizationScope GetDecodedSynchScope(unsigned Val) { 188 switch (Val) { 189 case bitc::SYNCHSCOPE_SINGLETHREAD: return SingleThread; 190 default: // Map unknown scopes to cross-thread. 191 case bitc::SYNCHSCOPE_CROSSTHREAD: return CrossThread; 192 } 193 } 194 195 namespace llvm { 196 namespace { 197 /// @brief A class for maintaining the slot number definition 198 /// as a placeholder for the actual definition for forward constants defs. 199 class ConstantPlaceHolder : public ConstantExpr { 200 void operator=(const ConstantPlaceHolder &); // DO NOT IMPLEMENT 201 public: 202 // allocate space for exactly one operand 203 void *operator new(size_t s) { 204 return User::operator new(s, 1); 205 } 206 explicit ConstantPlaceHolder(Type *Ty, LLVMContext& Context) 207 : ConstantExpr(Ty, Instruction::UserOp1, &Op<0>(), 1) { 208 Op<0>() = UndefValue::get(Type::getInt32Ty(Context)); 209 } 210 211 /// @brief Methods to support type inquiry through isa, cast, and dyn_cast. 212 //static inline bool classof(const ConstantPlaceHolder *) { return true; } 213 static bool classof(const Value *V) { 214 return isa<ConstantExpr>(V) && 215 cast<ConstantExpr>(V)->getOpcode() == Instruction::UserOp1; 216 } 217 218 219 /// Provide fast operand accessors 220 //DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value); 221 }; 222 } 223 224 // FIXME: can we inherit this from ConstantExpr? 225 template <> 226 struct OperandTraits<ConstantPlaceHolder> : 227 public FixedNumOperandTraits<ConstantPlaceHolder, 1> { 228 }; 229 } 230 231 232 void BitcodeReaderValueList::AssignValue(Value *V, unsigned Idx) { 233 if (Idx == size()) { 234 push_back(V); 235 return; 236 } 237 238 if (Idx >= size()) 239 resize(Idx+1); 240 241 WeakVH &OldV = ValuePtrs[Idx]; 242 if (OldV == 0) { 243 OldV = V; 244 return; 245 } 246 247 // Handle constants and non-constants (e.g. instrs) differently for 248 // efficiency. 249 if (Constant *PHC = dyn_cast<Constant>(&*OldV)) { 250 ResolveConstants.push_back(std::make_pair(PHC, Idx)); 251 OldV = V; 252 } else { 253 // If there was a forward reference to this value, replace it. 254 Value *PrevVal = OldV; 255 OldV->replaceAllUsesWith(V); 256 delete PrevVal; 257 } 258 } 259 260 261 Constant *BitcodeReaderValueList::getConstantFwdRef(unsigned Idx, 262 Type *Ty) { 263 if (Idx >= size()) 264 resize(Idx + 1); 265 266 if (Value *V = ValuePtrs[Idx]) { 267 assert(Ty == V->getType() && "Type mismatch in constant table!"); 268 return cast<Constant>(V); 269 } 270 271 // Create and return a placeholder, which will later be RAUW'd. 272 Constant *C = new ConstantPlaceHolder(Ty, Context); 273 ValuePtrs[Idx] = C; 274 return C; 275 } 276 277 Value *BitcodeReaderValueList::getValueFwdRef(unsigned Idx, Type *Ty) { 278 if (Idx >= size()) 279 resize(Idx + 1); 280 281 if (Value *V = ValuePtrs[Idx]) { 282 assert((Ty == 0 || Ty == V->getType()) && "Type mismatch in value table!"); 283 return V; 284 } 285 286 // No type specified, must be invalid reference. 287 if (Ty == 0) return 0; 288 289 // Create and return a placeholder, which will later be RAUW'd. 290 Value *V = new Argument(Ty); 291 ValuePtrs[Idx] = V; 292 return V; 293 } 294 295 /// ResolveConstantForwardRefs - Once all constants are read, this method bulk 296 /// resolves any forward references. The idea behind this is that we sometimes 297 /// get constants (such as large arrays) which reference *many* forward ref 298 /// constants. Replacing each of these causes a lot of thrashing when 299 /// building/reuniquing the constant. Instead of doing this, we look at all the 300 /// uses and rewrite all the place holders at once for any constant that uses 301 /// a placeholder. 302 void BitcodeReaderValueList::ResolveConstantForwardRefs() { 303 // Sort the values by-pointer so that they are efficient to look up with a 304 // binary search. 305 std::sort(ResolveConstants.begin(), ResolveConstants.end()); 306 307 SmallVector<Constant*, 64> NewOps; 308 309 while (!ResolveConstants.empty()) { 310 Value *RealVal = operator[](ResolveConstants.back().second); 311 Constant *Placeholder = ResolveConstants.back().first; 312 ResolveConstants.pop_back(); 313 314 // Loop over all users of the placeholder, updating them to reference the 315 // new value. If they reference more than one placeholder, update them all 316 // at once. 317 while (!Placeholder->use_empty()) { 318 Value::use_iterator UI = Placeholder->use_begin(); 319 User *U = *UI; 320 321 // If the using object isn't uniqued, just update the operands. This 322 // handles instructions and initializers for global variables. 323 if (!isa<Constant>(U) || isa<GlobalValue>(U)) { 324 UI.getUse().set(RealVal); 325 continue; 326 } 327 328 // Otherwise, we have a constant that uses the placeholder. Replace that 329 // constant with a new constant that has *all* placeholder uses updated. 330 Constant *UserC = cast<Constant>(U); 331 for (User::op_iterator I = UserC->op_begin(), E = UserC->op_end(); 332 I != E; ++I) { 333 Value *NewOp; 334 if (!isa<ConstantPlaceHolder>(*I)) { 335 // Not a placeholder reference. 336 NewOp = *I; 337 } else if (*I == Placeholder) { 338 // Common case is that it just references this one placeholder. 339 NewOp = RealVal; 340 } else { 341 // Otherwise, look up the placeholder in ResolveConstants. 342 ResolveConstantsTy::iterator It = 343 std::lower_bound(ResolveConstants.begin(), ResolveConstants.end(), 344 std::pair<Constant*, unsigned>(cast<Constant>(*I), 345 0)); 346 assert(It != ResolveConstants.end() && It->first == *I); 347 NewOp = operator[](It->second); 348 } 349 350 NewOps.push_back(cast<Constant>(NewOp)); 351 } 352 353 // Make the new constant. 354 Constant *NewC; 355 if (ConstantArray *UserCA = dyn_cast<ConstantArray>(UserC)) { 356 NewC = ConstantArray::get(UserCA->getType(), NewOps); 357 } else if (ConstantStruct *UserCS = dyn_cast<ConstantStruct>(UserC)) { 358 NewC = ConstantStruct::get(UserCS->getType(), NewOps); 359 } else if (isa<ConstantVector>(UserC)) { 360 NewC = ConstantVector::get(NewOps); 361 } else { 362 assert(isa<ConstantExpr>(UserC) && "Must be a ConstantExpr."); 363 NewC = cast<ConstantExpr>(UserC)->getWithOperands(NewOps); 364 } 365 366 UserC->replaceAllUsesWith(NewC); 367 UserC->destroyConstant(); 368 NewOps.clear(); 369 } 370 371 // Update all ValueHandles, they should be the only users at this point. 372 Placeholder->replaceAllUsesWith(RealVal); 373 delete Placeholder; 374 } 375 } 376 377 void BitcodeReaderMDValueList::AssignValue(Value *V, unsigned Idx) { 378 if (Idx == size()) { 379 push_back(V); 380 return; 381 } 382 383 if (Idx >= size()) 384 resize(Idx+1); 385 386 WeakVH &OldV = MDValuePtrs[Idx]; 387 if (OldV == 0) { 388 OldV = V; 389 return; 390 } 391 392 // If there was a forward reference to this value, replace it. 393 MDNode *PrevVal = cast<MDNode>(OldV); 394 OldV->replaceAllUsesWith(V); 395 MDNode::deleteTemporary(PrevVal); 396 // Deleting PrevVal sets Idx value in MDValuePtrs to null. Set new 397 // value for Idx. 398 MDValuePtrs[Idx] = V; 399 } 400 401 Value *BitcodeReaderMDValueList::getValueFwdRef(unsigned Idx) { 402 if (Idx >= size()) 403 resize(Idx + 1); 404 405 if (Value *V = MDValuePtrs[Idx]) { 406 assert(V->getType()->isMetadataTy() && "Type mismatch in value table!"); 407 return V; 408 } 409 410 // Create and return a placeholder, which will later be RAUW'd. 411 Value *V = MDNode::getTemporary(Context, ArrayRef<Value*>()); 412 MDValuePtrs[Idx] = V; 413 return V; 414 } 415 416 Type *BitcodeReader::getTypeByID(unsigned ID) { 417 // The type table size is always specified correctly. 418 if (ID >= TypeList.size()) 419 return 0; 420 421 if (Type *Ty = TypeList[ID]) 422 return Ty; 423 424 // If we have a forward reference, the only possible case is when it is to a 425 // named struct. Just create a placeholder for now. 426 return TypeList[ID] = StructType::create(Context); 427 } 428 429 430 //===----------------------------------------------------------------------===// 431 // Functions for parsing blocks from the bitcode file 432 //===----------------------------------------------------------------------===// 433 434 bool BitcodeReader::ParseAttributeBlock() { 435 if (Stream.EnterSubBlock(bitc::PARAMATTR_BLOCK_ID)) 436 return Error("Malformed block record"); 437 438 if (!MAttributes.empty()) 439 return Error("Multiple PARAMATTR blocks found!"); 440 441 SmallVector<uint64_t, 64> Record; 442 443 SmallVector<AttributeWithIndex, 8> Attrs; 444 445 // Read all the records. 446 while (1) { 447 unsigned Code = Stream.ReadCode(); 448 if (Code == bitc::END_BLOCK) { 449 if (Stream.ReadBlockEnd()) 450 return Error("Error at end of PARAMATTR block"); 451 return false; 452 } 453 454 if (Code == bitc::ENTER_SUBBLOCK) { 455 // No known subblocks, always skip them. 456 Stream.ReadSubBlockID(); 457 if (Stream.SkipBlock()) 458 return Error("Malformed block record"); 459 continue; 460 } 461 462 if (Code == bitc::DEFINE_ABBREV) { 463 Stream.ReadAbbrevRecord(); 464 continue; 465 } 466 467 // Read a record. 468 Record.clear(); 469 switch (Stream.ReadRecord(Code, Record)) { 470 default: // Default behavior: ignore. 471 break; 472 case bitc::PARAMATTR_CODE_ENTRY: { // ENTRY: [paramidx0, attr0, ...] 473 if (Record.size() & 1) 474 return Error("Invalid ENTRY record"); 475 476 for (unsigned i = 0, e = Record.size(); i != e; i += 2) { 477 Attributes ReconstitutedAttr = 478 Attribute::decodeLLVMAttributesForBitcode(Record[i+1]); 479 Record[i+1] = ReconstitutedAttr.Raw(); 480 } 481 482 for (unsigned i = 0, e = Record.size(); i != e; i += 2) { 483 if (Attributes(Record[i+1]) != Attribute::None) 484 Attrs.push_back(AttributeWithIndex::get(Record[i], 485 Attributes(Record[i+1]))); 486 } 487 488 MAttributes.push_back(AttrListPtr::get(Attrs)); 489 Attrs.clear(); 490 break; 491 } 492 } 493 } 494 } 495 496 bool BitcodeReader::ParseTypeTable() { 497 if (Stream.EnterSubBlock(bitc::TYPE_BLOCK_ID_NEW)) 498 return Error("Malformed block record"); 499 500 return ParseTypeTableBody(); 501 } 502 503 bool BitcodeReader::ParseTypeTableBody() { 504 if (!TypeList.empty()) 505 return Error("Multiple TYPE_BLOCKs found!"); 506 507 SmallVector<uint64_t, 64> Record; 508 unsigned NumRecords = 0; 509 510 SmallString<64> TypeName; 511 512 // Read all the records for this type table. 513 while (1) { 514 unsigned Code = Stream.ReadCode(); 515 if (Code == bitc::END_BLOCK) { 516 if (NumRecords != TypeList.size()) 517 return Error("Invalid type forward reference in TYPE_BLOCK"); 518 if (Stream.ReadBlockEnd()) 519 return Error("Error at end of type table block"); 520 return false; 521 } 522 523 if (Code == bitc::ENTER_SUBBLOCK) { 524 // No known subblocks, always skip them. 525 Stream.ReadSubBlockID(); 526 if (Stream.SkipBlock()) 527 return Error("Malformed block record"); 528 continue; 529 } 530 531 if (Code == bitc::DEFINE_ABBREV) { 532 Stream.ReadAbbrevRecord(); 533 continue; 534 } 535 536 // Read a record. 537 Record.clear(); 538 Type *ResultTy = 0; 539 switch (Stream.ReadRecord(Code, Record)) { 540 default: return Error("unknown type in type table"); 541 case bitc::TYPE_CODE_NUMENTRY: // TYPE_CODE_NUMENTRY: [numentries] 542 // TYPE_CODE_NUMENTRY contains a count of the number of types in the 543 // type list. This allows us to reserve space. 544 if (Record.size() < 1) 545 return Error("Invalid TYPE_CODE_NUMENTRY record"); 546 TypeList.resize(Record[0]); 547 continue; 548 case bitc::TYPE_CODE_VOID: // VOID 549 ResultTy = Type::getVoidTy(Context); 550 break; 551 case bitc::TYPE_CODE_HALF: // HALF 552 ResultTy = Type::getHalfTy(Context); 553 break; 554 case bitc::TYPE_CODE_FLOAT: // FLOAT 555 ResultTy = Type::getFloatTy(Context); 556 break; 557 case bitc::TYPE_CODE_DOUBLE: // DOUBLE 558 ResultTy = Type::getDoubleTy(Context); 559 break; 560 case bitc::TYPE_CODE_X86_FP80: // X86_FP80 561 ResultTy = Type::getX86_FP80Ty(Context); 562 break; 563 case bitc::TYPE_CODE_FP128: // FP128 564 ResultTy = Type::getFP128Ty(Context); 565 break; 566 case bitc::TYPE_CODE_PPC_FP128: // PPC_FP128 567 ResultTy = Type::getPPC_FP128Ty(Context); 568 break; 569 case bitc::TYPE_CODE_LABEL: // LABEL 570 ResultTy = Type::getLabelTy(Context); 571 break; 572 case bitc::TYPE_CODE_METADATA: // METADATA 573 ResultTy = Type::getMetadataTy(Context); 574 break; 575 case bitc::TYPE_CODE_X86_MMX: // X86_MMX 576 ResultTy = Type::getX86_MMXTy(Context); 577 break; 578 case bitc::TYPE_CODE_INTEGER: // INTEGER: [width] 579 if (Record.size() < 1) 580 return Error("Invalid Integer type record"); 581 582 ResultTy = IntegerType::get(Context, Record[0]); 583 break; 584 case bitc::TYPE_CODE_POINTER: { // POINTER: [pointee type] or 585 // [pointee type, address space] 586 if (Record.size() < 1) 587 return Error("Invalid POINTER type record"); 588 unsigned AddressSpace = 0; 589 if (Record.size() == 2) 590 AddressSpace = Record[1]; 591 ResultTy = getTypeByID(Record[0]); 592 if (ResultTy == 0) return Error("invalid element type in pointer type"); 593 ResultTy = PointerType::get(ResultTy, AddressSpace); 594 break; 595 } 596 case bitc::TYPE_CODE_FUNCTION_OLD: { 597 // FIXME: attrid is dead, remove it in LLVM 4.0 598 // FUNCTION: [vararg, attrid, retty, paramty x N] 599 if (Record.size() < 3) 600 return Error("Invalid FUNCTION type record"); 601 SmallVector<Type*, 8> ArgTys; 602 for (unsigned i = 3, e = Record.size(); i != e; ++i) { 603 if (Type *T = getTypeByID(Record[i])) 604 ArgTys.push_back(T); 605 else 606 break; 607 } 608 609 ResultTy = getTypeByID(Record[2]); 610 if (ResultTy == 0 || ArgTys.size() < Record.size()-3) 611 return Error("invalid type in function type"); 612 613 ResultTy = FunctionType::get(ResultTy, ArgTys, Record[0]); 614 break; 615 } 616 case bitc::TYPE_CODE_FUNCTION: { 617 // FUNCTION: [vararg, retty, paramty x N] 618 if (Record.size() < 2) 619 return Error("Invalid FUNCTION type record"); 620 SmallVector<Type*, 8> ArgTys; 621 for (unsigned i = 2, e = Record.size(); i != e; ++i) { 622 if (Type *T = getTypeByID(Record[i])) 623 ArgTys.push_back(T); 624 else 625 break; 626 } 627 628 ResultTy = getTypeByID(Record[1]); 629 if (ResultTy == 0 || ArgTys.size() < Record.size()-2) 630 return Error("invalid type in function type"); 631 632 ResultTy = FunctionType::get(ResultTy, ArgTys, Record[0]); 633 break; 634 } 635 case bitc::TYPE_CODE_STRUCT_ANON: { // STRUCT: [ispacked, eltty x N] 636 if (Record.size() < 1) 637 return Error("Invalid STRUCT type record"); 638 SmallVector<Type*, 8> EltTys; 639 for (unsigned i = 1, e = Record.size(); i != e; ++i) { 640 if (Type *T = getTypeByID(Record[i])) 641 EltTys.push_back(T); 642 else 643 break; 644 } 645 if (EltTys.size() != Record.size()-1) 646 return Error("invalid type in struct type"); 647 ResultTy = StructType::get(Context, EltTys, Record[0]); 648 break; 649 } 650 case bitc::TYPE_CODE_STRUCT_NAME: // STRUCT_NAME: [strchr x N] 651 if (ConvertToString(Record, 0, TypeName)) 652 return Error("Invalid STRUCT_NAME record"); 653 continue; 654 655 case bitc::TYPE_CODE_STRUCT_NAMED: { // STRUCT: [ispacked, eltty x N] 656 if (Record.size() < 1) 657 return Error("Invalid STRUCT type record"); 658 659 if (NumRecords >= TypeList.size()) 660 return Error("invalid TYPE table"); 661 662 // Check to see if this was forward referenced, if so fill in the temp. 663 StructType *Res = cast_or_null<StructType>(TypeList[NumRecords]); 664 if (Res) { 665 Res->setName(TypeName); 666 TypeList[NumRecords] = 0; 667 } else // Otherwise, create a new struct. 668 Res = StructType::create(Context, TypeName); 669 TypeName.clear(); 670 671 SmallVector<Type*, 8> EltTys; 672 for (unsigned i = 1, e = Record.size(); i != e; ++i) { 673 if (Type *T = getTypeByID(Record[i])) 674 EltTys.push_back(T); 675 else 676 break; 677 } 678 if (EltTys.size() != Record.size()-1) 679 return Error("invalid STRUCT type record"); 680 Res->setBody(EltTys, Record[0]); 681 ResultTy = Res; 682 break; 683 } 684 case bitc::TYPE_CODE_OPAQUE: { // OPAQUE: [] 685 if (Record.size() != 1) 686 return Error("Invalid OPAQUE type record"); 687 688 if (NumRecords >= TypeList.size()) 689 return Error("invalid TYPE table"); 690 691 // Check to see if this was forward referenced, if so fill in the temp. 692 StructType *Res = cast_or_null<StructType>(TypeList[NumRecords]); 693 if (Res) { 694 Res->setName(TypeName); 695 TypeList[NumRecords] = 0; 696 } else // Otherwise, create a new struct with no body. 697 Res = StructType::create(Context, TypeName); 698 TypeName.clear(); 699 ResultTy = Res; 700 break; 701 } 702 case bitc::TYPE_CODE_ARRAY: // ARRAY: [numelts, eltty] 703 if (Record.size() < 2) 704 return Error("Invalid ARRAY type record"); 705 if ((ResultTy = getTypeByID(Record[1]))) 706 ResultTy = ArrayType::get(ResultTy, Record[0]); 707 else 708 return Error("Invalid ARRAY type element"); 709 break; 710 case bitc::TYPE_CODE_VECTOR: // VECTOR: [numelts, eltty] 711 if (Record.size() < 2) 712 return Error("Invalid VECTOR type record"); 713 if ((ResultTy = getTypeByID(Record[1]))) 714 ResultTy = VectorType::get(ResultTy, Record[0]); 715 else 716 return Error("Invalid ARRAY type element"); 717 break; 718 } 719 720 if (NumRecords >= TypeList.size()) 721 return Error("invalid TYPE table"); 722 assert(ResultTy && "Didn't read a type?"); 723 assert(TypeList[NumRecords] == 0 && "Already read type?"); 724 TypeList[NumRecords++] = ResultTy; 725 } 726 } 727 728 bool BitcodeReader::ParseValueSymbolTable() { 729 if (Stream.EnterSubBlock(bitc::VALUE_SYMTAB_BLOCK_ID)) 730 return Error("Malformed block record"); 731 732 SmallVector<uint64_t, 64> Record; 733 734 // Read all the records for this value table. 735 SmallString<128> ValueName; 736 while (1) { 737 unsigned Code = Stream.ReadCode(); 738 if (Code == bitc::END_BLOCK) { 739 if (Stream.ReadBlockEnd()) 740 return Error("Error at end of value symbol table block"); 741 return false; 742 } 743 if (Code == bitc::ENTER_SUBBLOCK) { 744 // No known subblocks, always skip them. 745 Stream.ReadSubBlockID(); 746 if (Stream.SkipBlock()) 747 return Error("Malformed block record"); 748 continue; 749 } 750 751 if (Code == bitc::DEFINE_ABBREV) { 752 Stream.ReadAbbrevRecord(); 753 continue; 754 } 755 756 // Read a record. 757 Record.clear(); 758 switch (Stream.ReadRecord(Code, Record)) { 759 default: // Default behavior: unknown type. 760 break; 761 case bitc::VST_CODE_ENTRY: { // VST_ENTRY: [valueid, namechar x N] 762 if (ConvertToString(Record, 1, ValueName)) 763 return Error("Invalid VST_ENTRY record"); 764 unsigned ValueID = Record[0]; 765 if (ValueID >= ValueList.size()) 766 return Error("Invalid Value ID in VST_ENTRY record"); 767 Value *V = ValueList[ValueID]; 768 769 V->setName(StringRef(ValueName.data(), ValueName.size())); 770 ValueName.clear(); 771 break; 772 } 773 case bitc::VST_CODE_BBENTRY: { 774 if (ConvertToString(Record, 1, ValueName)) 775 return Error("Invalid VST_BBENTRY record"); 776 BasicBlock *BB = getBasicBlock(Record[0]); 777 if (BB == 0) 778 return Error("Invalid BB ID in VST_BBENTRY record"); 779 780 BB->setName(StringRef(ValueName.data(), ValueName.size())); 781 ValueName.clear(); 782 break; 783 } 784 } 785 } 786 } 787 788 bool BitcodeReader::ParseMetadata() { 789 unsigned NextMDValueNo = MDValueList.size(); 790 791 if (Stream.EnterSubBlock(bitc::METADATA_BLOCK_ID)) 792 return Error("Malformed block record"); 793 794 SmallVector<uint64_t, 64> Record; 795 796 // Read all the records. 797 while (1) { 798 unsigned Code = Stream.ReadCode(); 799 if (Code == bitc::END_BLOCK) { 800 if (Stream.ReadBlockEnd()) 801 return Error("Error at end of PARAMATTR block"); 802 return false; 803 } 804 805 if (Code == bitc::ENTER_SUBBLOCK) { 806 // No known subblocks, always skip them. 807 Stream.ReadSubBlockID(); 808 if (Stream.SkipBlock()) 809 return Error("Malformed block record"); 810 continue; 811 } 812 813 if (Code == bitc::DEFINE_ABBREV) { 814 Stream.ReadAbbrevRecord(); 815 continue; 816 } 817 818 bool IsFunctionLocal = false; 819 // Read a record. 820 Record.clear(); 821 Code = Stream.ReadRecord(Code, Record); 822 switch (Code) { 823 default: // Default behavior: ignore. 824 break; 825 case bitc::METADATA_NAME: { 826 // Read named of the named metadata. 827 SmallString<8> Name(Record.begin(), Record.end()); 828 Record.clear(); 829 Code = Stream.ReadCode(); 830 831 // METADATA_NAME is always followed by METADATA_NAMED_NODE. 832 unsigned NextBitCode = Stream.ReadRecord(Code, Record); 833 assert(NextBitCode == bitc::METADATA_NAMED_NODE); (void)NextBitCode; 834 835 // Read named metadata elements. 836 unsigned Size = Record.size(); 837 NamedMDNode *NMD = TheModule->getOrInsertNamedMetadata(Name); 838 for (unsigned i = 0; i != Size; ++i) { 839 MDNode *MD = dyn_cast<MDNode>(MDValueList.getValueFwdRef(Record[i])); 840 if (MD == 0) 841 return Error("Malformed metadata record"); 842 NMD->addOperand(MD); 843 } 844 break; 845 } 846 case bitc::METADATA_FN_NODE: 847 IsFunctionLocal = true; 848 // fall-through 849 case bitc::METADATA_NODE: { 850 if (Record.size() % 2 == 1) 851 return Error("Invalid METADATA_NODE record"); 852 853 unsigned Size = Record.size(); 854 SmallVector<Value*, 8> Elts; 855 for (unsigned i = 0; i != Size; i += 2) { 856 Type *Ty = getTypeByID(Record[i]); 857 if (!Ty) return Error("Invalid METADATA_NODE record"); 858 if (Ty->isMetadataTy()) 859 Elts.push_back(MDValueList.getValueFwdRef(Record[i+1])); 860 else if (!Ty->isVoidTy()) 861 Elts.push_back(ValueList.getValueFwdRef(Record[i+1], Ty)); 862 else 863 Elts.push_back(NULL); 864 } 865 Value *V = MDNode::getWhenValsUnresolved(Context, Elts, IsFunctionLocal); 866 IsFunctionLocal = false; 867 MDValueList.AssignValue(V, NextMDValueNo++); 868 break; 869 } 870 case bitc::METADATA_STRING: { 871 SmallString<8> String(Record.begin(), Record.end()); 872 Value *V = MDString::get(Context, String); 873 MDValueList.AssignValue(V, NextMDValueNo++); 874 break; 875 } 876 case bitc::METADATA_KIND: { 877 if (Record.size() < 2) 878 return Error("Invalid METADATA_KIND record"); 879 880 unsigned Kind = Record[0]; 881 SmallString<8> Name(Record.begin()+1, Record.end()); 882 883 unsigned NewKind = TheModule->getMDKindID(Name.str()); 884 if (!MDKindMap.insert(std::make_pair(Kind, NewKind)).second) 885 return Error("Conflicting METADATA_KIND records"); 886 break; 887 } 888 } 889 } 890 } 891 892 /// DecodeSignRotatedValue - Decode a signed value stored with the sign bit in 893 /// the LSB for dense VBR encoding. 894 static uint64_t DecodeSignRotatedValue(uint64_t V) { 895 if ((V & 1) == 0) 896 return V >> 1; 897 if (V != 1) 898 return -(V >> 1); 899 // There is no such thing as -0 with integers. "-0" really means MININT. 900 return 1ULL << 63; 901 } 902 903 /// ResolveGlobalAndAliasInits - Resolve all of the initializers for global 904 /// values and aliases that we can. 905 bool BitcodeReader::ResolveGlobalAndAliasInits() { 906 std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInitWorklist; 907 std::vector<std::pair<GlobalAlias*, unsigned> > AliasInitWorklist; 908 909 GlobalInitWorklist.swap(GlobalInits); 910 AliasInitWorklist.swap(AliasInits); 911 912 while (!GlobalInitWorklist.empty()) { 913 unsigned ValID = GlobalInitWorklist.back().second; 914 if (ValID >= ValueList.size()) { 915 // Not ready to resolve this yet, it requires something later in the file. 916 GlobalInits.push_back(GlobalInitWorklist.back()); 917 } else { 918 if (Constant *C = dyn_cast<Constant>(ValueList[ValID])) 919 GlobalInitWorklist.back().first->setInitializer(C); 920 else 921 return Error("Global variable initializer is not a constant!"); 922 } 923 GlobalInitWorklist.pop_back(); 924 } 925 926 while (!AliasInitWorklist.empty()) { 927 unsigned ValID = AliasInitWorklist.back().second; 928 if (ValID >= ValueList.size()) { 929 AliasInits.push_back(AliasInitWorklist.back()); 930 } else { 931 if (Constant *C = dyn_cast<Constant>(ValueList[ValID])) 932 AliasInitWorklist.back().first->setAliasee(C); 933 else 934 return Error("Alias initializer is not a constant!"); 935 } 936 AliasInitWorklist.pop_back(); 937 } 938 return false; 939 } 940 941 static APInt ReadWideAPInt(ArrayRef<uint64_t> Vals, unsigned TypeBits) { 942 SmallVector<uint64_t, 8> Words(Vals.size()); 943 std::transform(Vals.begin(), Vals.end(), Words.begin(), 944 DecodeSignRotatedValue); 945 946 return APInt(TypeBits, Words); 947 } 948 949 bool BitcodeReader::ParseConstants() { 950 if (Stream.EnterSubBlock(bitc::CONSTANTS_BLOCK_ID)) 951 return Error("Malformed block record"); 952 953 SmallVector<uint64_t, 64> Record; 954 955 // Read all the records for this value table. 956 Type *CurTy = Type::getInt32Ty(Context); 957 unsigned NextCstNo = ValueList.size(); 958 while (1) { 959 unsigned Code = Stream.ReadCode(); 960 if (Code == bitc::END_BLOCK) 961 break; 962 963 if (Code == bitc::ENTER_SUBBLOCK) { 964 // No known subblocks, always skip them. 965 Stream.ReadSubBlockID(); 966 if (Stream.SkipBlock()) 967 return Error("Malformed block record"); 968 continue; 969 } 970 971 if (Code == bitc::DEFINE_ABBREV) { 972 Stream.ReadAbbrevRecord(); 973 continue; 974 } 975 976 // Read a record. 977 Record.clear(); 978 Value *V = 0; 979 unsigned BitCode = Stream.ReadRecord(Code, Record); 980 switch (BitCode) { 981 default: // Default behavior: unknown constant 982 case bitc::CST_CODE_UNDEF: // UNDEF 983 V = UndefValue::get(CurTy); 984 break; 985 case bitc::CST_CODE_SETTYPE: // SETTYPE: [typeid] 986 if (Record.empty()) 987 return Error("Malformed CST_SETTYPE record"); 988 if (Record[0] >= TypeList.size()) 989 return Error("Invalid Type ID in CST_SETTYPE record"); 990 CurTy = TypeList[Record[0]]; 991 continue; // Skip the ValueList manipulation. 992 case bitc::CST_CODE_NULL: // NULL 993 V = Constant::getNullValue(CurTy); 994 break; 995 case bitc::CST_CODE_INTEGER: // INTEGER: [intval] 996 if (!CurTy->isIntegerTy() || Record.empty()) 997 return Error("Invalid CST_INTEGER record"); 998 V = ConstantInt::get(CurTy, DecodeSignRotatedValue(Record[0])); 999 break; 1000 case bitc::CST_CODE_WIDE_INTEGER: {// WIDE_INTEGER: [n x intval] 1001 if (!CurTy->isIntegerTy() || Record.empty()) 1002 return Error("Invalid WIDE_INTEGER record"); 1003 1004 APInt VInt = ReadWideAPInt(Record, 1005 cast<IntegerType>(CurTy)->getBitWidth()); 1006 V = ConstantInt::get(Context, VInt); 1007 1008 break; 1009 } 1010 case bitc::CST_CODE_FLOAT: { // FLOAT: [fpval] 1011 if (Record.empty()) 1012 return Error("Invalid FLOAT record"); 1013 if (CurTy->isHalfTy()) 1014 V = ConstantFP::get(Context, APFloat(APInt(16, (uint16_t)Record[0]))); 1015 else if (CurTy->isFloatTy()) 1016 V = ConstantFP::get(Context, APFloat(APInt(32, (uint32_t)Record[0]))); 1017 else if (CurTy->isDoubleTy()) 1018 V = ConstantFP::get(Context, APFloat(APInt(64, Record[0]))); 1019 else if (CurTy->isX86_FP80Ty()) { 1020 // Bits are not stored the same way as a normal i80 APInt, compensate. 1021 uint64_t Rearrange[2]; 1022 Rearrange[0] = (Record[1] & 0xffffLL) | (Record[0] << 16); 1023 Rearrange[1] = Record[0] >> 48; 1024 V = ConstantFP::get(Context, APFloat(APInt(80, Rearrange))); 1025 } else if (CurTy->isFP128Ty()) 1026 V = ConstantFP::get(Context, APFloat(APInt(128, Record), true)); 1027 else if (CurTy->isPPC_FP128Ty()) 1028 V = ConstantFP::get(Context, APFloat(APInt(128, Record))); 1029 else 1030 V = UndefValue::get(CurTy); 1031 break; 1032 } 1033 1034 case bitc::CST_CODE_AGGREGATE: {// AGGREGATE: [n x value number] 1035 if (Record.empty()) 1036 return Error("Invalid CST_AGGREGATE record"); 1037 1038 unsigned Size = Record.size(); 1039 SmallVector<Constant*, 16> Elts; 1040 1041 if (StructType *STy = dyn_cast<StructType>(CurTy)) { 1042 for (unsigned i = 0; i != Size; ++i) 1043 Elts.push_back(ValueList.getConstantFwdRef(Record[i], 1044 STy->getElementType(i))); 1045 V = ConstantStruct::get(STy, Elts); 1046 } else if (ArrayType *ATy = dyn_cast<ArrayType>(CurTy)) { 1047 Type *EltTy = ATy->getElementType(); 1048 for (unsigned i = 0; i != Size; ++i) 1049 Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy)); 1050 V = ConstantArray::get(ATy, Elts); 1051 } else if (VectorType *VTy = dyn_cast<VectorType>(CurTy)) { 1052 Type *EltTy = VTy->getElementType(); 1053 for (unsigned i = 0; i != Size; ++i) 1054 Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy)); 1055 V = ConstantVector::get(Elts); 1056 } else { 1057 V = UndefValue::get(CurTy); 1058 } 1059 break; 1060 } 1061 case bitc::CST_CODE_STRING: // STRING: [values] 1062 case bitc::CST_CODE_CSTRING: { // CSTRING: [values] 1063 if (Record.empty()) 1064 return Error("Invalid CST_STRING record"); 1065 1066 SmallString<16> Elts(Record.begin(), Record.end()); 1067 V = ConstantDataArray::getString(Context, Elts, 1068 BitCode == bitc::CST_CODE_CSTRING); 1069 break; 1070 } 1071 case bitc::CST_CODE_DATA: {// DATA: [n x value] 1072 if (Record.empty()) 1073 return Error("Invalid CST_DATA record"); 1074 1075 Type *EltTy = cast<SequentialType>(CurTy)->getElementType(); 1076 unsigned Size = Record.size(); 1077 1078 if (EltTy->isIntegerTy(8)) { 1079 SmallVector<uint8_t, 16> Elts(Record.begin(), Record.end()); 1080 if (isa<VectorType>(CurTy)) 1081 V = ConstantDataVector::get(Context, Elts); 1082 else 1083 V = ConstantDataArray::get(Context, Elts); 1084 } else if (EltTy->isIntegerTy(16)) { 1085 SmallVector<uint16_t, 16> Elts(Record.begin(), Record.end()); 1086 if (isa<VectorType>(CurTy)) 1087 V = ConstantDataVector::get(Context, Elts); 1088 else 1089 V = ConstantDataArray::get(Context, Elts); 1090 } else if (EltTy->isIntegerTy(32)) { 1091 SmallVector<uint32_t, 16> Elts(Record.begin(), Record.end()); 1092 if (isa<VectorType>(CurTy)) 1093 V = ConstantDataVector::get(Context, Elts); 1094 else 1095 V = ConstantDataArray::get(Context, Elts); 1096 } else if (EltTy->isIntegerTy(64)) { 1097 SmallVector<uint64_t, 16> Elts(Record.begin(), Record.end()); 1098 if (isa<VectorType>(CurTy)) 1099 V = ConstantDataVector::get(Context, Elts); 1100 else 1101 V = ConstantDataArray::get(Context, Elts); 1102 } else if (EltTy->isFloatTy()) { 1103 SmallVector<float, 16> Elts(Size); 1104 std::transform(Record.begin(), Record.end(), Elts.begin(), BitsToFloat); 1105 if (isa<VectorType>(CurTy)) 1106 V = ConstantDataVector::get(Context, Elts); 1107 else 1108 V = ConstantDataArray::get(Context, Elts); 1109 } else if (EltTy->isDoubleTy()) { 1110 SmallVector<double, 16> Elts(Size); 1111 std::transform(Record.begin(), Record.end(), Elts.begin(), 1112 BitsToDouble); 1113 if (isa<VectorType>(CurTy)) 1114 V = ConstantDataVector::get(Context, Elts); 1115 else 1116 V = ConstantDataArray::get(Context, Elts); 1117 } else { 1118 return Error("Unknown element type in CE_DATA"); 1119 } 1120 break; 1121 } 1122 1123 case bitc::CST_CODE_CE_BINOP: { // CE_BINOP: [opcode, opval, opval] 1124 if (Record.size() < 3) return Error("Invalid CE_BINOP record"); 1125 int Opc = GetDecodedBinaryOpcode(Record[0], CurTy); 1126 if (Opc < 0) { 1127 V = UndefValue::get(CurTy); // Unknown binop. 1128 } else { 1129 Constant *LHS = ValueList.getConstantFwdRef(Record[1], CurTy); 1130 Constant *RHS = ValueList.getConstantFwdRef(Record[2], CurTy); 1131 unsigned Flags = 0; 1132 if (Record.size() >= 4) { 1133 if (Opc == Instruction::Add || 1134 Opc == Instruction::Sub || 1135 Opc == Instruction::Mul || 1136 Opc == Instruction::Shl) { 1137 if (Record[3] & (1 << bitc::OBO_NO_SIGNED_WRAP)) 1138 Flags |= OverflowingBinaryOperator::NoSignedWrap; 1139 if (Record[3] & (1 << bitc::OBO_NO_UNSIGNED_WRAP)) 1140 Flags |= OverflowingBinaryOperator::NoUnsignedWrap; 1141 } else if (Opc == Instruction::SDiv || 1142 Opc == Instruction::UDiv || 1143 Opc == Instruction::LShr || 1144 Opc == Instruction::AShr) { 1145 if (Record[3] & (1 << bitc::PEO_EXACT)) 1146 Flags |= SDivOperator::IsExact; 1147 } 1148 } 1149 V = ConstantExpr::get(Opc, LHS, RHS, Flags); 1150 } 1151 break; 1152 } 1153 case bitc::CST_CODE_CE_CAST: { // CE_CAST: [opcode, opty, opval] 1154 if (Record.size() < 3) return Error("Invalid CE_CAST record"); 1155 int Opc = GetDecodedCastOpcode(Record[0]); 1156 if (Opc < 0) { 1157 V = UndefValue::get(CurTy); // Unknown cast. 1158 } else { 1159 Type *OpTy = getTypeByID(Record[1]); 1160 if (!OpTy) return Error("Invalid CE_CAST record"); 1161 Constant *Op = ValueList.getConstantFwdRef(Record[2], OpTy); 1162 V = ConstantExpr::getCast(Opc, Op, CurTy); 1163 } 1164 break; 1165 } 1166 case bitc::CST_CODE_CE_INBOUNDS_GEP: 1167 case bitc::CST_CODE_CE_GEP: { // CE_GEP: [n x operands] 1168 if (Record.size() & 1) return Error("Invalid CE_GEP record"); 1169 SmallVector<Constant*, 16> Elts; 1170 for (unsigned i = 0, e = Record.size(); i != e; i += 2) { 1171 Type *ElTy = getTypeByID(Record[i]); 1172 if (!ElTy) return Error("Invalid CE_GEP record"); 1173 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], ElTy)); 1174 } 1175 ArrayRef<Constant *> Indices(Elts.begin() + 1, Elts.end()); 1176 V = ConstantExpr::getGetElementPtr(Elts[0], Indices, 1177 BitCode == 1178 bitc::CST_CODE_CE_INBOUNDS_GEP); 1179 break; 1180 } 1181 case bitc::CST_CODE_CE_SELECT: // CE_SELECT: [opval#, opval#, opval#] 1182 if (Record.size() < 3) return Error("Invalid CE_SELECT record"); 1183 V = ConstantExpr::getSelect(ValueList.getConstantFwdRef(Record[0], 1184 Type::getInt1Ty(Context)), 1185 ValueList.getConstantFwdRef(Record[1],CurTy), 1186 ValueList.getConstantFwdRef(Record[2],CurTy)); 1187 break; 1188 case bitc::CST_CODE_CE_EXTRACTELT: { // CE_EXTRACTELT: [opty, opval, opval] 1189 if (Record.size() < 3) return Error("Invalid CE_EXTRACTELT record"); 1190 VectorType *OpTy = 1191 dyn_cast_or_null<VectorType>(getTypeByID(Record[0])); 1192 if (OpTy == 0) return Error("Invalid CE_EXTRACTELT record"); 1193 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 1194 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], Type::getInt32Ty(Context)); 1195 V = ConstantExpr::getExtractElement(Op0, Op1); 1196 break; 1197 } 1198 case bitc::CST_CODE_CE_INSERTELT: { // CE_INSERTELT: [opval, opval, opval] 1199 VectorType *OpTy = dyn_cast<VectorType>(CurTy); 1200 if (Record.size() < 3 || OpTy == 0) 1201 return Error("Invalid CE_INSERTELT record"); 1202 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); 1203 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], 1204 OpTy->getElementType()); 1205 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], Type::getInt32Ty(Context)); 1206 V = ConstantExpr::getInsertElement(Op0, Op1, Op2); 1207 break; 1208 } 1209 case bitc::CST_CODE_CE_SHUFFLEVEC: { // CE_SHUFFLEVEC: [opval, opval, opval] 1210 VectorType *OpTy = dyn_cast<VectorType>(CurTy); 1211 if (Record.size() < 3 || OpTy == 0) 1212 return Error("Invalid CE_SHUFFLEVEC record"); 1213 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); 1214 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], OpTy); 1215 Type *ShufTy = VectorType::get(Type::getInt32Ty(Context), 1216 OpTy->getNumElements()); 1217 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], ShufTy); 1218 V = ConstantExpr::getShuffleVector(Op0, Op1, Op2); 1219 break; 1220 } 1221 case bitc::CST_CODE_CE_SHUFVEC_EX: { // [opty, opval, opval, opval] 1222 VectorType *RTy = dyn_cast<VectorType>(CurTy); 1223 VectorType *OpTy = 1224 dyn_cast_or_null<VectorType>(getTypeByID(Record[0])); 1225 if (Record.size() < 4 || RTy == 0 || OpTy == 0) 1226 return Error("Invalid CE_SHUFVEC_EX record"); 1227 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 1228 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy); 1229 Type *ShufTy = VectorType::get(Type::getInt32Ty(Context), 1230 RTy->getNumElements()); 1231 Constant *Op2 = ValueList.getConstantFwdRef(Record[3], ShufTy); 1232 V = ConstantExpr::getShuffleVector(Op0, Op1, Op2); 1233 break; 1234 } 1235 case bitc::CST_CODE_CE_CMP: { // CE_CMP: [opty, opval, opval, pred] 1236 if (Record.size() < 4) return Error("Invalid CE_CMP record"); 1237 Type *OpTy = getTypeByID(Record[0]); 1238 if (OpTy == 0) return Error("Invalid CE_CMP record"); 1239 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 1240 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy); 1241 1242 if (OpTy->isFPOrFPVectorTy()) 1243 V = ConstantExpr::getFCmp(Record[3], Op0, Op1); 1244 else 1245 V = ConstantExpr::getICmp(Record[3], Op0, Op1); 1246 break; 1247 } 1248 // This maintains backward compatibility, pre-'nsdialect'. 1249 // FIXME: Remove with the 4.0 release. 1250 case bitc::CST_CODE_INLINEASM_OLD: { 1251 if (Record.size() < 2) return Error("Invalid INLINEASM record"); 1252 std::string AsmStr, ConstrStr; 1253 bool HasSideEffects = Record[0] & 1; 1254 bool IsAlignStack = Record[0] >> 1; 1255 unsigned AsmStrSize = Record[1]; 1256 if (2+AsmStrSize >= Record.size()) 1257 return Error("Invalid INLINEASM record"); 1258 unsigned ConstStrSize = Record[2+AsmStrSize]; 1259 if (3+AsmStrSize+ConstStrSize > Record.size()) 1260 return Error("Invalid INLINEASM record"); 1261 1262 for (unsigned i = 0; i != AsmStrSize; ++i) 1263 AsmStr += (char)Record[2+i]; 1264 for (unsigned i = 0; i != ConstStrSize; ++i) 1265 ConstrStr += (char)Record[3+AsmStrSize+i]; 1266 PointerType *PTy = cast<PointerType>(CurTy); 1267 V = InlineAsm::get(cast<FunctionType>(PTy->getElementType()), 1268 AsmStr, ConstrStr, HasSideEffects, IsAlignStack); 1269 break; 1270 } 1271 // This version adds support for the 'nsdialect' keyword. 1272 case bitc::CST_CODE_INLINEASM: { 1273 if (Record.size() < 2) return Error("Invalid INLINEASM record"); 1274 std::string AsmStr, ConstrStr; 1275 bool HasSideEffects = Record[0] & 1; 1276 bool IsAlignStack = (Record[0] >> 1) & 1; 1277 unsigned AsmDialect = Record[0] >> 2; 1278 unsigned AsmStrSize = Record[1]; 1279 if (2+AsmStrSize >= Record.size()) 1280 return Error("Invalid INLINEASM record"); 1281 unsigned ConstStrSize = Record[2+AsmStrSize]; 1282 if (3+AsmStrSize+ConstStrSize > Record.size()) 1283 return Error("Invalid INLINEASM record"); 1284 1285 for (unsigned i = 0; i != AsmStrSize; ++i) 1286 AsmStr += (char)Record[2+i]; 1287 for (unsigned i = 0; i != ConstStrSize; ++i) 1288 ConstrStr += (char)Record[3+AsmStrSize+i]; 1289 PointerType *PTy = cast<PointerType>(CurTy); 1290 V = InlineAsm::get(cast<FunctionType>(PTy->getElementType()), 1291 AsmStr, ConstrStr, HasSideEffects, IsAlignStack, 1292 AsmDialect); 1293 break; 1294 } 1295 case bitc::CST_CODE_BLOCKADDRESS:{ 1296 if (Record.size() < 3) return Error("Invalid CE_BLOCKADDRESS record"); 1297 Type *FnTy = getTypeByID(Record[0]); 1298 if (FnTy == 0) return Error("Invalid CE_BLOCKADDRESS record"); 1299 Function *Fn = 1300 dyn_cast_or_null<Function>(ValueList.getConstantFwdRef(Record[1],FnTy)); 1301 if (Fn == 0) return Error("Invalid CE_BLOCKADDRESS record"); 1302 1303 GlobalVariable *FwdRef = new GlobalVariable(*Fn->getParent(), 1304 Type::getInt8Ty(Context), 1305 false, GlobalValue::InternalLinkage, 1306 0, ""); 1307 BlockAddrFwdRefs[Fn].push_back(std::make_pair(Record[2], FwdRef)); 1308 V = FwdRef; 1309 break; 1310 } 1311 } 1312 1313 ValueList.AssignValue(V, NextCstNo); 1314 ++NextCstNo; 1315 } 1316 1317 if (NextCstNo != ValueList.size()) 1318 return Error("Invalid constant reference!"); 1319 1320 if (Stream.ReadBlockEnd()) 1321 return Error("Error at end of constants block"); 1322 1323 // Once all the constants have been read, go through and resolve forward 1324 // references. 1325 ValueList.ResolveConstantForwardRefs(); 1326 return false; 1327 } 1328 1329 bool BitcodeReader::ParseUseLists() { 1330 if (Stream.EnterSubBlock(bitc::USELIST_BLOCK_ID)) 1331 return Error("Malformed block record"); 1332 1333 SmallVector<uint64_t, 64> Record; 1334 1335 // Read all the records. 1336 while (1) { 1337 unsigned Code = Stream.ReadCode(); 1338 if (Code == bitc::END_BLOCK) { 1339 if (Stream.ReadBlockEnd()) 1340 return Error("Error at end of use-list table block"); 1341 return false; 1342 } 1343 1344 if (Code == bitc::ENTER_SUBBLOCK) { 1345 // No known subblocks, always skip them. 1346 Stream.ReadSubBlockID(); 1347 if (Stream.SkipBlock()) 1348 return Error("Malformed block record"); 1349 continue; 1350 } 1351 1352 if (Code == bitc::DEFINE_ABBREV) { 1353 Stream.ReadAbbrevRecord(); 1354 continue; 1355 } 1356 1357 // Read a use list record. 1358 Record.clear(); 1359 switch (Stream.ReadRecord(Code, Record)) { 1360 default: // Default behavior: unknown type. 1361 break; 1362 case bitc::USELIST_CODE_ENTRY: { // USELIST_CODE_ENTRY: TBD. 1363 unsigned RecordLength = Record.size(); 1364 if (RecordLength < 1) 1365 return Error ("Invalid UseList reader!"); 1366 UseListRecords.push_back(Record); 1367 break; 1368 } 1369 } 1370 } 1371 } 1372 1373 /// RememberAndSkipFunctionBody - When we see the block for a function body, 1374 /// remember where it is and then skip it. This lets us lazily deserialize the 1375 /// functions. 1376 bool BitcodeReader::RememberAndSkipFunctionBody() { 1377 // Get the function we are talking about. 1378 if (FunctionsWithBodies.empty()) 1379 return Error("Insufficient function protos"); 1380 1381 Function *Fn = FunctionsWithBodies.back(); 1382 FunctionsWithBodies.pop_back(); 1383 1384 // Save the current stream state. 1385 uint64_t CurBit = Stream.GetCurrentBitNo(); 1386 DeferredFunctionInfo[Fn] = CurBit; 1387 1388 // Skip over the function block for now. 1389 if (Stream.SkipBlock()) 1390 return Error("Malformed block record"); 1391 return false; 1392 } 1393 1394 bool BitcodeReader::GlobalCleanup() { 1395 // Patch the initializers for globals and aliases up. 1396 ResolveGlobalAndAliasInits(); 1397 if (!GlobalInits.empty() || !AliasInits.empty()) 1398 return Error("Malformed global initializer set"); 1399 1400 // Look for intrinsic functions which need to be upgraded at some point 1401 for (Module::iterator FI = TheModule->begin(), FE = TheModule->end(); 1402 FI != FE; ++FI) { 1403 Function *NewFn; 1404 if (UpgradeIntrinsicFunction(FI, NewFn)) 1405 UpgradedIntrinsics.push_back(std::make_pair(FI, NewFn)); 1406 } 1407 1408 // Look for global variables which need to be renamed. 1409 for (Module::global_iterator 1410 GI = TheModule->global_begin(), GE = TheModule->global_end(); 1411 GI != GE; ++GI) 1412 UpgradeGlobalVariable(GI); 1413 // Force deallocation of memory for these vectors to favor the client that 1414 // want lazy deserialization. 1415 std::vector<std::pair<GlobalVariable*, unsigned> >().swap(GlobalInits); 1416 std::vector<std::pair<GlobalAlias*, unsigned> >().swap(AliasInits); 1417 return false; 1418 } 1419 1420 bool BitcodeReader::ParseModule(bool Resume) { 1421 if (Resume) 1422 Stream.JumpToBit(NextUnreadBit); 1423 else if (Stream.EnterSubBlock(bitc::MODULE_BLOCK_ID)) 1424 return Error("Malformed block record"); 1425 1426 SmallVector<uint64_t, 64> Record; 1427 std::vector<std::string> SectionTable; 1428 std::vector<std::string> GCTable; 1429 1430 // Read all the records for this module. 1431 while (!Stream.AtEndOfStream()) { 1432 unsigned Code = Stream.ReadCode(); 1433 if (Code == bitc::END_BLOCK) { 1434 if (Stream.ReadBlockEnd()) 1435 return Error("Error at end of module block"); 1436 1437 return GlobalCleanup(); 1438 } 1439 1440 if (Code == bitc::ENTER_SUBBLOCK) { 1441 switch (Stream.ReadSubBlockID()) { 1442 default: // Skip unknown content. 1443 if (Stream.SkipBlock()) 1444 return Error("Malformed block record"); 1445 break; 1446 case bitc::BLOCKINFO_BLOCK_ID: 1447 if (Stream.ReadBlockInfoBlock()) 1448 return Error("Malformed BlockInfoBlock"); 1449 break; 1450 case bitc::PARAMATTR_BLOCK_ID: 1451 if (ParseAttributeBlock()) 1452 return true; 1453 break; 1454 case bitc::TYPE_BLOCK_ID_NEW: 1455 if (ParseTypeTable()) 1456 return true; 1457 break; 1458 case bitc::VALUE_SYMTAB_BLOCK_ID: 1459 if (ParseValueSymbolTable()) 1460 return true; 1461 SeenValueSymbolTable = true; 1462 break; 1463 case bitc::CONSTANTS_BLOCK_ID: 1464 if (ParseConstants() || ResolveGlobalAndAliasInits()) 1465 return true; 1466 break; 1467 case bitc::METADATA_BLOCK_ID: 1468 if (ParseMetadata()) 1469 return true; 1470 break; 1471 case bitc::FUNCTION_BLOCK_ID: 1472 // If this is the first function body we've seen, reverse the 1473 // FunctionsWithBodies list. 1474 if (!SeenFirstFunctionBody) { 1475 std::reverse(FunctionsWithBodies.begin(), FunctionsWithBodies.end()); 1476 if (GlobalCleanup()) 1477 return true; 1478 SeenFirstFunctionBody = true; 1479 } 1480 1481 if (RememberAndSkipFunctionBody()) 1482 return true; 1483 // For streaming bitcode, suspend parsing when we reach the function 1484 // bodies. Subsequent materialization calls will resume it when 1485 // necessary. For streaming, the function bodies must be at the end of 1486 // the bitcode. If the bitcode file is old, the symbol table will be 1487 // at the end instead and will not have been seen yet. In this case, 1488 // just finish the parse now. 1489 if (LazyStreamer && SeenValueSymbolTable) { 1490 NextUnreadBit = Stream.GetCurrentBitNo(); 1491 return false; 1492 } 1493 break; 1494 case bitc::USELIST_BLOCK_ID: 1495 if (ParseUseLists()) 1496 return true; 1497 break; 1498 } 1499 continue; 1500 } 1501 1502 if (Code == bitc::DEFINE_ABBREV) { 1503 Stream.ReadAbbrevRecord(); 1504 continue; 1505 } 1506 1507 // Read a record. 1508 switch (Stream.ReadRecord(Code, Record)) { 1509 default: break; // Default behavior, ignore unknown content. 1510 case bitc::MODULE_CODE_VERSION: // VERSION: [version#] 1511 if (Record.size() < 1) 1512 return Error("Malformed MODULE_CODE_VERSION"); 1513 // Only version #0 is supported so far. 1514 if (Record[0] != 0) 1515 return Error("Unknown bitstream version!"); 1516 break; 1517 case bitc::MODULE_CODE_TRIPLE: { // TRIPLE: [strchr x N] 1518 std::string S; 1519 if (ConvertToString(Record, 0, S)) 1520 return Error("Invalid MODULE_CODE_TRIPLE record"); 1521 TheModule->setTargetTriple(S); 1522 break; 1523 } 1524 case bitc::MODULE_CODE_DATALAYOUT: { // DATALAYOUT: [strchr x N] 1525 std::string S; 1526 if (ConvertToString(Record, 0, S)) 1527 return Error("Invalid MODULE_CODE_DATALAYOUT record"); 1528 TheModule->setDataLayout(S); 1529 break; 1530 } 1531 case bitc::MODULE_CODE_ASM: { // ASM: [strchr x N] 1532 std::string S; 1533 if (ConvertToString(Record, 0, S)) 1534 return Error("Invalid MODULE_CODE_ASM record"); 1535 TheModule->setModuleInlineAsm(S); 1536 break; 1537 } 1538 case bitc::MODULE_CODE_DEPLIB: { // DEPLIB: [strchr x N] 1539 std::string S; 1540 if (ConvertToString(Record, 0, S)) 1541 return Error("Invalid MODULE_CODE_DEPLIB record"); 1542 TheModule->addLibrary(S); 1543 break; 1544 } 1545 case bitc::MODULE_CODE_SECTIONNAME: { // SECTIONNAME: [strchr x N] 1546 std::string S; 1547 if (ConvertToString(Record, 0, S)) 1548 return Error("Invalid MODULE_CODE_SECTIONNAME record"); 1549 SectionTable.push_back(S); 1550 break; 1551 } 1552 case bitc::MODULE_CODE_GCNAME: { // SECTIONNAME: [strchr x N] 1553 std::string S; 1554 if (ConvertToString(Record, 0, S)) 1555 return Error("Invalid MODULE_CODE_GCNAME record"); 1556 GCTable.push_back(S); 1557 break; 1558 } 1559 // GLOBALVAR: [pointer type, isconst, initid, 1560 // linkage, alignment, section, visibility, threadlocal, 1561 // unnamed_addr] 1562 case bitc::MODULE_CODE_GLOBALVAR: { 1563 if (Record.size() < 6) 1564 return Error("Invalid MODULE_CODE_GLOBALVAR record"); 1565 Type *Ty = getTypeByID(Record[0]); 1566 if (!Ty) return Error("Invalid MODULE_CODE_GLOBALVAR record"); 1567 if (!Ty->isPointerTy()) 1568 return Error("Global not a pointer type!"); 1569 unsigned AddressSpace = cast<PointerType>(Ty)->getAddressSpace(); 1570 Ty = cast<PointerType>(Ty)->getElementType(); 1571 1572 bool isConstant = Record[1]; 1573 GlobalValue::LinkageTypes Linkage = GetDecodedLinkage(Record[3]); 1574 unsigned Alignment = (1 << Record[4]) >> 1; 1575 std::string Section; 1576 if (Record[5]) { 1577 if (Record[5]-1 >= SectionTable.size()) 1578 return Error("Invalid section ID"); 1579 Section = SectionTable[Record[5]-1]; 1580 } 1581 GlobalValue::VisibilityTypes Visibility = GlobalValue::DefaultVisibility; 1582 if (Record.size() > 6) 1583 Visibility = GetDecodedVisibility(Record[6]); 1584 1585 GlobalVariable::ThreadLocalMode TLM = GlobalVariable::NotThreadLocal; 1586 if (Record.size() > 7) 1587 TLM = GetDecodedThreadLocalMode(Record[7]); 1588 1589 bool UnnamedAddr = false; 1590 if (Record.size() > 8) 1591 UnnamedAddr = Record[8]; 1592 1593 GlobalVariable *NewGV = 1594 new GlobalVariable(*TheModule, Ty, isConstant, Linkage, 0, "", 0, 1595 TLM, AddressSpace); 1596 NewGV->setAlignment(Alignment); 1597 if (!Section.empty()) 1598 NewGV->setSection(Section); 1599 NewGV->setVisibility(Visibility); 1600 NewGV->setUnnamedAddr(UnnamedAddr); 1601 1602 ValueList.push_back(NewGV); 1603 1604 // Remember which value to use for the global initializer. 1605 if (unsigned InitID = Record[2]) 1606 GlobalInits.push_back(std::make_pair(NewGV, InitID-1)); 1607 break; 1608 } 1609 // FUNCTION: [type, callingconv, isproto, linkage, paramattr, 1610 // alignment, section, visibility, gc, unnamed_addr] 1611 case bitc::MODULE_CODE_FUNCTION: { 1612 if (Record.size() < 8) 1613 return Error("Invalid MODULE_CODE_FUNCTION record"); 1614 Type *Ty = getTypeByID(Record[0]); 1615 if (!Ty) return Error("Invalid MODULE_CODE_FUNCTION record"); 1616 if (!Ty->isPointerTy()) 1617 return Error("Function not a pointer type!"); 1618 FunctionType *FTy = 1619 dyn_cast<FunctionType>(cast<PointerType>(Ty)->getElementType()); 1620 if (!FTy) 1621 return Error("Function not a pointer to function type!"); 1622 1623 Function *Func = Function::Create(FTy, GlobalValue::ExternalLinkage, 1624 "", TheModule); 1625 1626 Func->setCallingConv(static_cast<CallingConv::ID>(Record[1])); 1627 bool isProto = Record[2]; 1628 Func->setLinkage(GetDecodedLinkage(Record[3])); 1629 Func->setAttributes(getAttributes(Record[4])); 1630 1631 Func->setAlignment((1 << Record[5]) >> 1); 1632 if (Record[6]) { 1633 if (Record[6]-1 >= SectionTable.size()) 1634 return Error("Invalid section ID"); 1635 Func->setSection(SectionTable[Record[6]-1]); 1636 } 1637 Func->setVisibility(GetDecodedVisibility(Record[7])); 1638 if (Record.size() > 8 && Record[8]) { 1639 if (Record[8]-1 > GCTable.size()) 1640 return Error("Invalid GC ID"); 1641 Func->setGC(GCTable[Record[8]-1].c_str()); 1642 } 1643 bool UnnamedAddr = false; 1644 if (Record.size() > 9) 1645 UnnamedAddr = Record[9]; 1646 Func->setUnnamedAddr(UnnamedAddr); 1647 ValueList.push_back(Func); 1648 1649 // If this is a function with a body, remember the prototype we are 1650 // creating now, so that we can match up the body with them later. 1651 if (!isProto) { 1652 FunctionsWithBodies.push_back(Func); 1653 if (LazyStreamer) DeferredFunctionInfo[Func] = 0; 1654 } 1655 break; 1656 } 1657 // ALIAS: [alias type, aliasee val#, linkage] 1658 // ALIAS: [alias type, aliasee val#, linkage, visibility] 1659 case bitc::MODULE_CODE_ALIAS: { 1660 if (Record.size() < 3) 1661 return Error("Invalid MODULE_ALIAS record"); 1662 Type *Ty = getTypeByID(Record[0]); 1663 if (!Ty) return Error("Invalid MODULE_ALIAS record"); 1664 if (!Ty->isPointerTy()) 1665 return Error("Function not a pointer type!"); 1666 1667 GlobalAlias *NewGA = new GlobalAlias(Ty, GetDecodedLinkage(Record[2]), 1668 "", 0, TheModule); 1669 // Old bitcode files didn't have visibility field. 1670 if (Record.size() > 3) 1671 NewGA->setVisibility(GetDecodedVisibility(Record[3])); 1672 ValueList.push_back(NewGA); 1673 AliasInits.push_back(std::make_pair(NewGA, Record[1])); 1674 break; 1675 } 1676 /// MODULE_CODE_PURGEVALS: [numvals] 1677 case bitc::MODULE_CODE_PURGEVALS: 1678 // Trim down the value list to the specified size. 1679 if (Record.size() < 1 || Record[0] > ValueList.size()) 1680 return Error("Invalid MODULE_PURGEVALS record"); 1681 ValueList.shrinkTo(Record[0]); 1682 break; 1683 } 1684 Record.clear(); 1685 } 1686 1687 return Error("Premature end of bitstream"); 1688 } 1689 1690 bool BitcodeReader::ParseBitcodeInto(Module *M) { 1691 TheModule = 0; 1692 1693 if (InitStream()) return true; 1694 1695 // Sniff for the signature. 1696 if (Stream.Read(8) != 'B' || 1697 Stream.Read(8) != 'C' || 1698 Stream.Read(4) != 0x0 || 1699 Stream.Read(4) != 0xC || 1700 Stream.Read(4) != 0xE || 1701 Stream.Read(4) != 0xD) 1702 return Error("Invalid bitcode signature"); 1703 1704 // We expect a number of well-defined blocks, though we don't necessarily 1705 // need to understand them all. 1706 while (!Stream.AtEndOfStream()) { 1707 unsigned Code = Stream.ReadCode(); 1708 1709 if (Code != bitc::ENTER_SUBBLOCK) { 1710 1711 // The ranlib in xcode 4 will align archive members by appending newlines 1712 // to the end of them. If this file size is a multiple of 4 but not 8, we 1713 // have to read and ignore these final 4 bytes :-( 1714 if (Stream.GetAbbrevIDWidth() == 2 && Code == 2 && 1715 Stream.Read(6) == 2 && Stream.Read(24) == 0xa0a0a && 1716 Stream.AtEndOfStream()) 1717 return false; 1718 1719 return Error("Invalid record at top-level"); 1720 } 1721 1722 unsigned BlockID = Stream.ReadSubBlockID(); 1723 1724 // We only know the MODULE subblock ID. 1725 switch (BlockID) { 1726 case bitc::BLOCKINFO_BLOCK_ID: 1727 if (Stream.ReadBlockInfoBlock()) 1728 return Error("Malformed BlockInfoBlock"); 1729 break; 1730 case bitc::MODULE_BLOCK_ID: 1731 // Reject multiple MODULE_BLOCK's in a single bitstream. 1732 if (TheModule) 1733 return Error("Multiple MODULE_BLOCKs in same stream"); 1734 TheModule = M; 1735 if (ParseModule(false)) 1736 return true; 1737 if (LazyStreamer) return false; 1738 break; 1739 default: 1740 if (Stream.SkipBlock()) 1741 return Error("Malformed block record"); 1742 break; 1743 } 1744 } 1745 1746 return false; 1747 } 1748 1749 bool BitcodeReader::ParseModuleTriple(std::string &Triple) { 1750 if (Stream.EnterSubBlock(bitc::MODULE_BLOCK_ID)) 1751 return Error("Malformed block record"); 1752 1753 SmallVector<uint64_t, 64> Record; 1754 1755 // Read all the records for this module. 1756 while (!Stream.AtEndOfStream()) { 1757 unsigned Code = Stream.ReadCode(); 1758 if (Code == bitc::END_BLOCK) { 1759 if (Stream.ReadBlockEnd()) 1760 return Error("Error at end of module block"); 1761 1762 return false; 1763 } 1764 1765 if (Code == bitc::ENTER_SUBBLOCK) { 1766 switch (Stream.ReadSubBlockID()) { 1767 default: // Skip unknown content. 1768 if (Stream.SkipBlock()) 1769 return Error("Malformed block record"); 1770 break; 1771 } 1772 continue; 1773 } 1774 1775 if (Code == bitc::DEFINE_ABBREV) { 1776 Stream.ReadAbbrevRecord(); 1777 continue; 1778 } 1779 1780 // Read a record. 1781 switch (Stream.ReadRecord(Code, Record)) { 1782 default: break; // Default behavior, ignore unknown content. 1783 case bitc::MODULE_CODE_VERSION: // VERSION: [version#] 1784 if (Record.size() < 1) 1785 return Error("Malformed MODULE_CODE_VERSION"); 1786 // Only version #0 is supported so far. 1787 if (Record[0] != 0) 1788 return Error("Unknown bitstream version!"); 1789 break; 1790 case bitc::MODULE_CODE_TRIPLE: { // TRIPLE: [strchr x N] 1791 std::string S; 1792 if (ConvertToString(Record, 0, S)) 1793 return Error("Invalid MODULE_CODE_TRIPLE record"); 1794 Triple = S; 1795 break; 1796 } 1797 } 1798 Record.clear(); 1799 } 1800 1801 return Error("Premature end of bitstream"); 1802 } 1803 1804 bool BitcodeReader::ParseTriple(std::string &Triple) { 1805 if (InitStream()) return true; 1806 1807 // Sniff for the signature. 1808 if (Stream.Read(8) != 'B' || 1809 Stream.Read(8) != 'C' || 1810 Stream.Read(4) != 0x0 || 1811 Stream.Read(4) != 0xC || 1812 Stream.Read(4) != 0xE || 1813 Stream.Read(4) != 0xD) 1814 return Error("Invalid bitcode signature"); 1815 1816 // We expect a number of well-defined blocks, though we don't necessarily 1817 // need to understand them all. 1818 while (!Stream.AtEndOfStream()) { 1819 unsigned Code = Stream.ReadCode(); 1820 1821 if (Code != bitc::ENTER_SUBBLOCK) 1822 return Error("Invalid record at top-level"); 1823 1824 unsigned BlockID = Stream.ReadSubBlockID(); 1825 1826 // We only know the MODULE subblock ID. 1827 switch (BlockID) { 1828 case bitc::MODULE_BLOCK_ID: 1829 if (ParseModuleTriple(Triple)) 1830 return true; 1831 break; 1832 default: 1833 if (Stream.SkipBlock()) 1834 return Error("Malformed block record"); 1835 break; 1836 } 1837 } 1838 1839 return false; 1840 } 1841 1842 /// ParseMetadataAttachment - Parse metadata attachments. 1843 bool BitcodeReader::ParseMetadataAttachment() { 1844 if (Stream.EnterSubBlock(bitc::METADATA_ATTACHMENT_ID)) 1845 return Error("Malformed block record"); 1846 1847 SmallVector<uint64_t, 64> Record; 1848 while(1) { 1849 unsigned Code = Stream.ReadCode(); 1850 if (Code == bitc::END_BLOCK) { 1851 if (Stream.ReadBlockEnd()) 1852 return Error("Error at end of PARAMATTR block"); 1853 break; 1854 } 1855 if (Code == bitc::DEFINE_ABBREV) { 1856 Stream.ReadAbbrevRecord(); 1857 continue; 1858 } 1859 // Read a metadata attachment record. 1860 Record.clear(); 1861 switch (Stream.ReadRecord(Code, Record)) { 1862 default: // Default behavior: ignore. 1863 break; 1864 case bitc::METADATA_ATTACHMENT: { 1865 unsigned RecordLength = Record.size(); 1866 if (Record.empty() || (RecordLength - 1) % 2 == 1) 1867 return Error ("Invalid METADATA_ATTACHMENT reader!"); 1868 Instruction *Inst = InstructionList[Record[0]]; 1869 for (unsigned i = 1; i != RecordLength; i = i+2) { 1870 unsigned Kind = Record[i]; 1871 DenseMap<unsigned, unsigned>::iterator I = 1872 MDKindMap.find(Kind); 1873 if (I == MDKindMap.end()) 1874 return Error("Invalid metadata kind ID"); 1875 Value *Node = MDValueList.getValueFwdRef(Record[i+1]); 1876 Inst->setMetadata(I->second, cast<MDNode>(Node)); 1877 } 1878 break; 1879 } 1880 } 1881 } 1882 return false; 1883 } 1884 1885 /// ParseFunctionBody - Lazily parse the specified function body block. 1886 bool BitcodeReader::ParseFunctionBody(Function *F) { 1887 if (Stream.EnterSubBlock(bitc::FUNCTION_BLOCK_ID)) 1888 return Error("Malformed block record"); 1889 1890 InstructionList.clear(); 1891 unsigned ModuleValueListSize = ValueList.size(); 1892 unsigned ModuleMDValueListSize = MDValueList.size(); 1893 1894 // Add all the function arguments to the value table. 1895 for(Function::arg_iterator I = F->arg_begin(), E = F->arg_end(); I != E; ++I) 1896 ValueList.push_back(I); 1897 1898 unsigned NextValueNo = ValueList.size(); 1899 BasicBlock *CurBB = 0; 1900 unsigned CurBBNo = 0; 1901 1902 DebugLoc LastLoc; 1903 1904 // Read all the records. 1905 SmallVector<uint64_t, 64> Record; 1906 while (1) { 1907 unsigned Code = Stream.ReadCode(); 1908 if (Code == bitc::END_BLOCK) { 1909 if (Stream.ReadBlockEnd()) 1910 return Error("Error at end of function block"); 1911 break; 1912 } 1913 1914 if (Code == bitc::ENTER_SUBBLOCK) { 1915 switch (Stream.ReadSubBlockID()) { 1916 default: // Skip unknown content. 1917 if (Stream.SkipBlock()) 1918 return Error("Malformed block record"); 1919 break; 1920 case bitc::CONSTANTS_BLOCK_ID: 1921 if (ParseConstants()) return true; 1922 NextValueNo = ValueList.size(); 1923 break; 1924 case bitc::VALUE_SYMTAB_BLOCK_ID: 1925 if (ParseValueSymbolTable()) return true; 1926 break; 1927 case bitc::METADATA_ATTACHMENT_ID: 1928 if (ParseMetadataAttachment()) return true; 1929 break; 1930 case bitc::METADATA_BLOCK_ID: 1931 if (ParseMetadata()) return true; 1932 break; 1933 } 1934 continue; 1935 } 1936 1937 if (Code == bitc::DEFINE_ABBREV) { 1938 Stream.ReadAbbrevRecord(); 1939 continue; 1940 } 1941 1942 // Read a record. 1943 Record.clear(); 1944 Instruction *I = 0; 1945 unsigned BitCode = Stream.ReadRecord(Code, Record); 1946 switch (BitCode) { 1947 default: // Default behavior: reject 1948 return Error("Unknown instruction"); 1949 case bitc::FUNC_CODE_DECLAREBLOCKS: // DECLAREBLOCKS: [nblocks] 1950 if (Record.size() < 1 || Record[0] == 0) 1951 return Error("Invalid DECLAREBLOCKS record"); 1952 // Create all the basic blocks for the function. 1953 FunctionBBs.resize(Record[0]); 1954 for (unsigned i = 0, e = FunctionBBs.size(); i != e; ++i) 1955 FunctionBBs[i] = BasicBlock::Create(Context, "", F); 1956 CurBB = FunctionBBs[0]; 1957 continue; 1958 1959 case bitc::FUNC_CODE_DEBUG_LOC_AGAIN: // DEBUG_LOC_AGAIN 1960 // This record indicates that the last instruction is at the same 1961 // location as the previous instruction with a location. 1962 I = 0; 1963 1964 // Get the last instruction emitted. 1965 if (CurBB && !CurBB->empty()) 1966 I = &CurBB->back(); 1967 else if (CurBBNo && FunctionBBs[CurBBNo-1] && 1968 !FunctionBBs[CurBBNo-1]->empty()) 1969 I = &FunctionBBs[CurBBNo-1]->back(); 1970 1971 if (I == 0) return Error("Invalid DEBUG_LOC_AGAIN record"); 1972 I->setDebugLoc(LastLoc); 1973 I = 0; 1974 continue; 1975 1976 case bitc::FUNC_CODE_DEBUG_LOC: { // DEBUG_LOC: [line, col, scope, ia] 1977 I = 0; // Get the last instruction emitted. 1978 if (CurBB && !CurBB->empty()) 1979 I = &CurBB->back(); 1980 else if (CurBBNo && FunctionBBs[CurBBNo-1] && 1981 !FunctionBBs[CurBBNo-1]->empty()) 1982 I = &FunctionBBs[CurBBNo-1]->back(); 1983 if (I == 0 || Record.size() < 4) 1984 return Error("Invalid FUNC_CODE_DEBUG_LOC record"); 1985 1986 unsigned Line = Record[0], Col = Record[1]; 1987 unsigned ScopeID = Record[2], IAID = Record[3]; 1988 1989 MDNode *Scope = 0, *IA = 0; 1990 if (ScopeID) Scope = cast<MDNode>(MDValueList.getValueFwdRef(ScopeID-1)); 1991 if (IAID) IA = cast<MDNode>(MDValueList.getValueFwdRef(IAID-1)); 1992 LastLoc = DebugLoc::get(Line, Col, Scope, IA); 1993 I->setDebugLoc(LastLoc); 1994 I = 0; 1995 continue; 1996 } 1997 1998 case bitc::FUNC_CODE_INST_BINOP: { // BINOP: [opval, ty, opval, opcode] 1999 unsigned OpNum = 0; 2000 Value *LHS, *RHS; 2001 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) || 2002 getValue(Record, OpNum, LHS->getType(), RHS) || 2003 OpNum+1 > Record.size()) 2004 return Error("Invalid BINOP record"); 2005 2006 int Opc = GetDecodedBinaryOpcode(Record[OpNum++], LHS->getType()); 2007 if (Opc == -1) return Error("Invalid BINOP record"); 2008 I = BinaryOperator::Create((Instruction::BinaryOps)Opc, LHS, RHS); 2009 InstructionList.push_back(I); 2010 if (OpNum < Record.size()) { 2011 if (Opc == Instruction::Add || 2012 Opc == Instruction::Sub || 2013 Opc == Instruction::Mul || 2014 Opc == Instruction::Shl) { 2015 if (Record[OpNum] & (1 << bitc::OBO_NO_SIGNED_WRAP)) 2016 cast<BinaryOperator>(I)->setHasNoSignedWrap(true); 2017 if (Record[OpNum] & (1 << bitc::OBO_NO_UNSIGNED_WRAP)) 2018 cast<BinaryOperator>(I)->setHasNoUnsignedWrap(true); 2019 } else if (Opc == Instruction::SDiv || 2020 Opc == Instruction::UDiv || 2021 Opc == Instruction::LShr || 2022 Opc == Instruction::AShr) { 2023 if (Record[OpNum] & (1 << bitc::PEO_EXACT)) 2024 cast<BinaryOperator>(I)->setIsExact(true); 2025 } 2026 } 2027 break; 2028 } 2029 case bitc::FUNC_CODE_INST_CAST: { // CAST: [opval, opty, destty, castopc] 2030 unsigned OpNum = 0; 2031 Value *Op; 2032 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 2033 OpNum+2 != Record.size()) 2034 return Error("Invalid CAST record"); 2035 2036 Type *ResTy = getTypeByID(Record[OpNum]); 2037 int Opc = GetDecodedCastOpcode(Record[OpNum+1]); 2038 if (Opc == -1 || ResTy == 0) 2039 return Error("Invalid CAST record"); 2040 I = CastInst::Create((Instruction::CastOps)Opc, Op, ResTy); 2041 InstructionList.push_back(I); 2042 break; 2043 } 2044 case bitc::FUNC_CODE_INST_INBOUNDS_GEP: 2045 case bitc::FUNC_CODE_INST_GEP: { // GEP: [n x operands] 2046 unsigned OpNum = 0; 2047 Value *BasePtr; 2048 if (getValueTypePair(Record, OpNum, NextValueNo, BasePtr)) 2049 return Error("Invalid GEP record"); 2050 2051 SmallVector<Value*, 16> GEPIdx; 2052 while (OpNum != Record.size()) { 2053 Value *Op; 2054 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 2055 return Error("Invalid GEP record"); 2056 GEPIdx.push_back(Op); 2057 } 2058 2059 I = GetElementPtrInst::Create(BasePtr, GEPIdx); 2060 InstructionList.push_back(I); 2061 if (BitCode == bitc::FUNC_CODE_INST_INBOUNDS_GEP) 2062 cast<GetElementPtrInst>(I)->setIsInBounds(true); 2063 break; 2064 } 2065 2066 case bitc::FUNC_CODE_INST_EXTRACTVAL: { 2067 // EXTRACTVAL: [opty, opval, n x indices] 2068 unsigned OpNum = 0; 2069 Value *Agg; 2070 if (getValueTypePair(Record, OpNum, NextValueNo, Agg)) 2071 return Error("Invalid EXTRACTVAL record"); 2072 2073 SmallVector<unsigned, 4> EXTRACTVALIdx; 2074 for (unsigned RecSize = Record.size(); 2075 OpNum != RecSize; ++OpNum) { 2076 uint64_t Index = Record[OpNum]; 2077 if ((unsigned)Index != Index) 2078 return Error("Invalid EXTRACTVAL index"); 2079 EXTRACTVALIdx.push_back((unsigned)Index); 2080 } 2081 2082 I = ExtractValueInst::Create(Agg, EXTRACTVALIdx); 2083 InstructionList.push_back(I); 2084 break; 2085 } 2086 2087 case bitc::FUNC_CODE_INST_INSERTVAL: { 2088 // INSERTVAL: [opty, opval, opty, opval, n x indices] 2089 unsigned OpNum = 0; 2090 Value *Agg; 2091 if (getValueTypePair(Record, OpNum, NextValueNo, Agg)) 2092 return Error("Invalid INSERTVAL record"); 2093 Value *Val; 2094 if (getValueTypePair(Record, OpNum, NextValueNo, Val)) 2095 return Error("Invalid INSERTVAL record"); 2096 2097 SmallVector<unsigned, 4> INSERTVALIdx; 2098 for (unsigned RecSize = Record.size(); 2099 OpNum != RecSize; ++OpNum) { 2100 uint64_t Index = Record[OpNum]; 2101 if ((unsigned)Index != Index) 2102 return Error("Invalid INSERTVAL index"); 2103 INSERTVALIdx.push_back((unsigned)Index); 2104 } 2105 2106 I = InsertValueInst::Create(Agg, Val, INSERTVALIdx); 2107 InstructionList.push_back(I); 2108 break; 2109 } 2110 2111 case bitc::FUNC_CODE_INST_SELECT: { // SELECT: [opval, ty, opval, opval] 2112 // obsolete form of select 2113 // handles select i1 ... in old bitcode 2114 unsigned OpNum = 0; 2115 Value *TrueVal, *FalseVal, *Cond; 2116 if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) || 2117 getValue(Record, OpNum, TrueVal->getType(), FalseVal) || 2118 getValue(Record, OpNum, Type::getInt1Ty(Context), Cond)) 2119 return Error("Invalid SELECT record"); 2120 2121 I = SelectInst::Create(Cond, TrueVal, FalseVal); 2122 InstructionList.push_back(I); 2123 break; 2124 } 2125 2126 case bitc::FUNC_CODE_INST_VSELECT: {// VSELECT: [ty,opval,opval,predty,pred] 2127 // new form of select 2128 // handles select i1 or select [N x i1] 2129 unsigned OpNum = 0; 2130 Value *TrueVal, *FalseVal, *Cond; 2131 if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) || 2132 getValue(Record, OpNum, TrueVal->getType(), FalseVal) || 2133 getValueTypePair(Record, OpNum, NextValueNo, Cond)) 2134 return Error("Invalid SELECT record"); 2135 2136 // select condition can be either i1 or [N x i1] 2137 if (VectorType* vector_type = 2138 dyn_cast<VectorType>(Cond->getType())) { 2139 // expect <n x i1> 2140 if (vector_type->getElementType() != Type::getInt1Ty(Context)) 2141 return Error("Invalid SELECT condition type"); 2142 } else { 2143 // expect i1 2144 if (Cond->getType() != Type::getInt1Ty(Context)) 2145 return Error("Invalid SELECT condition type"); 2146 } 2147 2148 I = SelectInst::Create(Cond, TrueVal, FalseVal); 2149 InstructionList.push_back(I); 2150 break; 2151 } 2152 2153 case bitc::FUNC_CODE_INST_EXTRACTELT: { // EXTRACTELT: [opty, opval, opval] 2154 unsigned OpNum = 0; 2155 Value *Vec, *Idx; 2156 if (getValueTypePair(Record, OpNum, NextValueNo, Vec) || 2157 getValue(Record, OpNum, Type::getInt32Ty(Context), Idx)) 2158 return Error("Invalid EXTRACTELT record"); 2159 I = ExtractElementInst::Create(Vec, Idx); 2160 InstructionList.push_back(I); 2161 break; 2162 } 2163 2164 case bitc::FUNC_CODE_INST_INSERTELT: { // INSERTELT: [ty, opval,opval,opval] 2165 unsigned OpNum = 0; 2166 Value *Vec, *Elt, *Idx; 2167 if (getValueTypePair(Record, OpNum, NextValueNo, Vec) || 2168 getValue(Record, OpNum, 2169 cast<VectorType>(Vec->getType())->getElementType(), Elt) || 2170 getValue(Record, OpNum, Type::getInt32Ty(Context), Idx)) 2171 return Error("Invalid INSERTELT record"); 2172 I = InsertElementInst::Create(Vec, Elt, Idx); 2173 InstructionList.push_back(I); 2174 break; 2175 } 2176 2177 case bitc::FUNC_CODE_INST_SHUFFLEVEC: {// SHUFFLEVEC: [opval,ty,opval,opval] 2178 unsigned OpNum = 0; 2179 Value *Vec1, *Vec2, *Mask; 2180 if (getValueTypePair(Record, OpNum, NextValueNo, Vec1) || 2181 getValue(Record, OpNum, Vec1->getType(), Vec2)) 2182 return Error("Invalid SHUFFLEVEC record"); 2183 2184 if (getValueTypePair(Record, OpNum, NextValueNo, Mask)) 2185 return Error("Invalid SHUFFLEVEC record"); 2186 I = new ShuffleVectorInst(Vec1, Vec2, Mask); 2187 InstructionList.push_back(I); 2188 break; 2189 } 2190 2191 case bitc::FUNC_CODE_INST_CMP: // CMP: [opty, opval, opval, pred] 2192 // Old form of ICmp/FCmp returning bool 2193 // Existed to differentiate between icmp/fcmp and vicmp/vfcmp which were 2194 // both legal on vectors but had different behaviour. 2195 case bitc::FUNC_CODE_INST_CMP2: { // CMP2: [opty, opval, opval, pred] 2196 // FCmp/ICmp returning bool or vector of bool 2197 2198 unsigned OpNum = 0; 2199 Value *LHS, *RHS; 2200 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) || 2201 getValue(Record, OpNum, LHS->getType(), RHS) || 2202 OpNum+1 != Record.size()) 2203 return Error("Invalid CMP record"); 2204 2205 if (LHS->getType()->isFPOrFPVectorTy()) 2206 I = new FCmpInst((FCmpInst::Predicate)Record[OpNum], LHS, RHS); 2207 else 2208 I = new ICmpInst((ICmpInst::Predicate)Record[OpNum], LHS, RHS); 2209 InstructionList.push_back(I); 2210 break; 2211 } 2212 2213 case bitc::FUNC_CODE_INST_RET: // RET: [opty,opval<optional>] 2214 { 2215 unsigned Size = Record.size(); 2216 if (Size == 0) { 2217 I = ReturnInst::Create(Context); 2218 InstructionList.push_back(I); 2219 break; 2220 } 2221 2222 unsigned OpNum = 0; 2223 Value *Op = NULL; 2224 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 2225 return Error("Invalid RET record"); 2226 if (OpNum != Record.size()) 2227 return Error("Invalid RET record"); 2228 2229 I = ReturnInst::Create(Context, Op); 2230 InstructionList.push_back(I); 2231 break; 2232 } 2233 case bitc::FUNC_CODE_INST_BR: { // BR: [bb#, bb#, opval] or [bb#] 2234 if (Record.size() != 1 && Record.size() != 3) 2235 return Error("Invalid BR record"); 2236 BasicBlock *TrueDest = getBasicBlock(Record[0]); 2237 if (TrueDest == 0) 2238 return Error("Invalid BR record"); 2239 2240 if (Record.size() == 1) { 2241 I = BranchInst::Create(TrueDest); 2242 InstructionList.push_back(I); 2243 } 2244 else { 2245 BasicBlock *FalseDest = getBasicBlock(Record[1]); 2246 Value *Cond = getFnValueByID(Record[2], Type::getInt1Ty(Context)); 2247 if (FalseDest == 0 || Cond == 0) 2248 return Error("Invalid BR record"); 2249 I = BranchInst::Create(TrueDest, FalseDest, Cond); 2250 InstructionList.push_back(I); 2251 } 2252 break; 2253 } 2254 case bitc::FUNC_CODE_INST_SWITCH: { // SWITCH: [opty, op0, op1, ...] 2255 // Check magic 2256 if ((Record[0] >> 16) == SWITCH_INST_MAGIC) { 2257 // New SwitchInst format with case ranges. 2258 2259 Type *OpTy = getTypeByID(Record[1]); 2260 unsigned ValueBitWidth = cast<IntegerType>(OpTy)->getBitWidth(); 2261 2262 Value *Cond = getFnValueByID(Record[2], OpTy); 2263 BasicBlock *Default = getBasicBlock(Record[3]); 2264 if (OpTy == 0 || Cond == 0 || Default == 0) 2265 return Error("Invalid SWITCH record"); 2266 2267 unsigned NumCases = Record[4]; 2268 2269 SwitchInst *SI = SwitchInst::Create(Cond, Default, NumCases); 2270 InstructionList.push_back(SI); 2271 2272 unsigned CurIdx = 5; 2273 for (unsigned i = 0; i != NumCases; ++i) { 2274 IntegersSubsetToBB CaseBuilder; 2275 unsigned NumItems = Record[CurIdx++]; 2276 for (unsigned ci = 0; ci != NumItems; ++ci) { 2277 bool isSingleNumber = Record[CurIdx++]; 2278 2279 APInt Low; 2280 unsigned ActiveWords = 1; 2281 if (ValueBitWidth > 64) 2282 ActiveWords = Record[CurIdx++]; 2283 Low = ReadWideAPInt(makeArrayRef(&Record[CurIdx], ActiveWords), 2284 ValueBitWidth); 2285 CurIdx += ActiveWords; 2286 2287 if (!isSingleNumber) { 2288 ActiveWords = 1; 2289 if (ValueBitWidth > 64) 2290 ActiveWords = Record[CurIdx++]; 2291 APInt High = 2292 ReadWideAPInt(makeArrayRef(&Record[CurIdx], ActiveWords), 2293 ValueBitWidth); 2294 2295 CaseBuilder.add(IntItem::fromType(OpTy, Low), 2296 IntItem::fromType(OpTy, High)); 2297 CurIdx += ActiveWords; 2298 } else 2299 CaseBuilder.add(IntItem::fromType(OpTy, Low)); 2300 } 2301 BasicBlock *DestBB = getBasicBlock(Record[CurIdx++]); 2302 IntegersSubset Case = CaseBuilder.getCase(); 2303 SI->addCase(Case, DestBB); 2304 } 2305 uint16_t Hash = SI->hash(); 2306 if (Hash != (Record[0] & 0xFFFF)) 2307 return Error("Invalid SWITCH record"); 2308 I = SI; 2309 break; 2310 } 2311 2312 // Old SwitchInst format without case ranges. 2313 2314 if (Record.size() < 3 || (Record.size() & 1) == 0) 2315 return Error("Invalid SWITCH record"); 2316 Type *OpTy = getTypeByID(Record[0]); 2317 Value *Cond = getFnValueByID(Record[1], OpTy); 2318 BasicBlock *Default = getBasicBlock(Record[2]); 2319 if (OpTy == 0 || Cond == 0 || Default == 0) 2320 return Error("Invalid SWITCH record"); 2321 unsigned NumCases = (Record.size()-3)/2; 2322 SwitchInst *SI = SwitchInst::Create(Cond, Default, NumCases); 2323 InstructionList.push_back(SI); 2324 for (unsigned i = 0, e = NumCases; i != e; ++i) { 2325 ConstantInt *CaseVal = 2326 dyn_cast_or_null<ConstantInt>(getFnValueByID(Record[3+i*2], OpTy)); 2327 BasicBlock *DestBB = getBasicBlock(Record[1+3+i*2]); 2328 if (CaseVal == 0 || DestBB == 0) { 2329 delete SI; 2330 return Error("Invalid SWITCH record!"); 2331 } 2332 SI->addCase(CaseVal, DestBB); 2333 } 2334 I = SI; 2335 break; 2336 } 2337 case bitc::FUNC_CODE_INST_INDIRECTBR: { // INDIRECTBR: [opty, op0, op1, ...] 2338 if (Record.size() < 2) 2339 return Error("Invalid INDIRECTBR record"); 2340 Type *OpTy = getTypeByID(Record[0]); 2341 Value *Address = getFnValueByID(Record[1], OpTy); 2342 if (OpTy == 0 || Address == 0) 2343 return Error("Invalid INDIRECTBR record"); 2344 unsigned NumDests = Record.size()-2; 2345 IndirectBrInst *IBI = IndirectBrInst::Create(Address, NumDests); 2346 InstructionList.push_back(IBI); 2347 for (unsigned i = 0, e = NumDests; i != e; ++i) { 2348 if (BasicBlock *DestBB = getBasicBlock(Record[2+i])) { 2349 IBI->addDestination(DestBB); 2350 } else { 2351 delete IBI; 2352 return Error("Invalid INDIRECTBR record!"); 2353 } 2354 } 2355 I = IBI; 2356 break; 2357 } 2358 2359 case bitc::FUNC_CODE_INST_INVOKE: { 2360 // INVOKE: [attrs, cc, normBB, unwindBB, fnty, op0,op1,op2, ...] 2361 if (Record.size() < 4) return Error("Invalid INVOKE record"); 2362 AttrListPtr PAL = getAttributes(Record[0]); 2363 unsigned CCInfo = Record[1]; 2364 BasicBlock *NormalBB = getBasicBlock(Record[2]); 2365 BasicBlock *UnwindBB = getBasicBlock(Record[3]); 2366 2367 unsigned OpNum = 4; 2368 Value *Callee; 2369 if (getValueTypePair(Record, OpNum, NextValueNo, Callee)) 2370 return Error("Invalid INVOKE record"); 2371 2372 PointerType *CalleeTy = dyn_cast<PointerType>(Callee->getType()); 2373 FunctionType *FTy = !CalleeTy ? 0 : 2374 dyn_cast<FunctionType>(CalleeTy->getElementType()); 2375 2376 // Check that the right number of fixed parameters are here. 2377 if (FTy == 0 || NormalBB == 0 || UnwindBB == 0 || 2378 Record.size() < OpNum+FTy->getNumParams()) 2379 return Error("Invalid INVOKE record"); 2380 2381 SmallVector<Value*, 16> Ops; 2382 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) { 2383 Ops.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i))); 2384 if (Ops.back() == 0) return Error("Invalid INVOKE record"); 2385 } 2386 2387 if (!FTy->isVarArg()) { 2388 if (Record.size() != OpNum) 2389 return Error("Invalid INVOKE record"); 2390 } else { 2391 // Read type/value pairs for varargs params. 2392 while (OpNum != Record.size()) { 2393 Value *Op; 2394 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 2395 return Error("Invalid INVOKE record"); 2396 Ops.push_back(Op); 2397 } 2398 } 2399 2400 I = InvokeInst::Create(Callee, NormalBB, UnwindBB, Ops); 2401 InstructionList.push_back(I); 2402 cast<InvokeInst>(I)->setCallingConv( 2403 static_cast<CallingConv::ID>(CCInfo)); 2404 cast<InvokeInst>(I)->setAttributes(PAL); 2405 break; 2406 } 2407 case bitc::FUNC_CODE_INST_RESUME: { // RESUME: [opval] 2408 unsigned Idx = 0; 2409 Value *Val = 0; 2410 if (getValueTypePair(Record, Idx, NextValueNo, Val)) 2411 return Error("Invalid RESUME record"); 2412 I = ResumeInst::Create(Val); 2413 InstructionList.push_back(I); 2414 break; 2415 } 2416 case bitc::FUNC_CODE_INST_UNREACHABLE: // UNREACHABLE 2417 I = new UnreachableInst(Context); 2418 InstructionList.push_back(I); 2419 break; 2420 case bitc::FUNC_CODE_INST_PHI: { // PHI: [ty, val0,bb0, ...] 2421 if (Record.size() < 1 || ((Record.size()-1)&1)) 2422 return Error("Invalid PHI record"); 2423 Type *Ty = getTypeByID(Record[0]); 2424 if (!Ty) return Error("Invalid PHI record"); 2425 2426 PHINode *PN = PHINode::Create(Ty, (Record.size()-1)/2); 2427 InstructionList.push_back(PN); 2428 2429 for (unsigned i = 0, e = Record.size()-1; i != e; i += 2) { 2430 Value *V = getFnValueByID(Record[1+i], Ty); 2431 BasicBlock *BB = getBasicBlock(Record[2+i]); 2432 if (!V || !BB) return Error("Invalid PHI record"); 2433 PN->addIncoming(V, BB); 2434 } 2435 I = PN; 2436 break; 2437 } 2438 2439 case bitc::FUNC_CODE_INST_LANDINGPAD: { 2440 // LANDINGPAD: [ty, val, val, num, (id0,val0 ...)?] 2441 unsigned Idx = 0; 2442 if (Record.size() < 4) 2443 return Error("Invalid LANDINGPAD record"); 2444 Type *Ty = getTypeByID(Record[Idx++]); 2445 if (!Ty) return Error("Invalid LANDINGPAD record"); 2446 Value *PersFn = 0; 2447 if (getValueTypePair(Record, Idx, NextValueNo, PersFn)) 2448 return Error("Invalid LANDINGPAD record"); 2449 2450 bool IsCleanup = !!Record[Idx++]; 2451 unsigned NumClauses = Record[Idx++]; 2452 LandingPadInst *LP = LandingPadInst::Create(Ty, PersFn, NumClauses); 2453 LP->setCleanup(IsCleanup); 2454 for (unsigned J = 0; J != NumClauses; ++J) { 2455 LandingPadInst::ClauseType CT = 2456 LandingPadInst::ClauseType(Record[Idx++]); (void)CT; 2457 Value *Val; 2458 2459 if (getValueTypePair(Record, Idx, NextValueNo, Val)) { 2460 delete LP; 2461 return Error("Invalid LANDINGPAD record"); 2462 } 2463 2464 assert((CT != LandingPadInst::Catch || 2465 !isa<ArrayType>(Val->getType())) && 2466 "Catch clause has a invalid type!"); 2467 assert((CT != LandingPadInst::Filter || 2468 isa<ArrayType>(Val->getType())) && 2469 "Filter clause has invalid type!"); 2470 LP->addClause(Val); 2471 } 2472 2473 I = LP; 2474 InstructionList.push_back(I); 2475 break; 2476 } 2477 2478 case bitc::FUNC_CODE_INST_ALLOCA: { // ALLOCA: [instty, opty, op, align] 2479 if (Record.size() != 4) 2480 return Error("Invalid ALLOCA record"); 2481 PointerType *Ty = 2482 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 2483 Type *OpTy = getTypeByID(Record[1]); 2484 Value *Size = getFnValueByID(Record[2], OpTy); 2485 unsigned Align = Record[3]; 2486 if (!Ty || !Size) return Error("Invalid ALLOCA record"); 2487 I = new AllocaInst(Ty->getElementType(), Size, (1 << Align) >> 1); 2488 InstructionList.push_back(I); 2489 break; 2490 } 2491 case bitc::FUNC_CODE_INST_LOAD: { // LOAD: [opty, op, align, vol] 2492 unsigned OpNum = 0; 2493 Value *Op; 2494 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 2495 OpNum+2 != Record.size()) 2496 return Error("Invalid LOAD record"); 2497 2498 I = new LoadInst(Op, "", Record[OpNum+1], (1 << Record[OpNum]) >> 1); 2499 InstructionList.push_back(I); 2500 break; 2501 } 2502 case bitc::FUNC_CODE_INST_LOADATOMIC: { 2503 // LOADATOMIC: [opty, op, align, vol, ordering, synchscope] 2504 unsigned OpNum = 0; 2505 Value *Op; 2506 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 2507 OpNum+4 != Record.size()) 2508 return Error("Invalid LOADATOMIC record"); 2509 2510 2511 AtomicOrdering Ordering = GetDecodedOrdering(Record[OpNum+2]); 2512 if (Ordering == NotAtomic || Ordering == Release || 2513 Ordering == AcquireRelease) 2514 return Error("Invalid LOADATOMIC record"); 2515 if (Ordering != NotAtomic && Record[OpNum] == 0) 2516 return Error("Invalid LOADATOMIC record"); 2517 SynchronizationScope SynchScope = GetDecodedSynchScope(Record[OpNum+3]); 2518 2519 I = new LoadInst(Op, "", Record[OpNum+1], (1 << Record[OpNum]) >> 1, 2520 Ordering, SynchScope); 2521 InstructionList.push_back(I); 2522 break; 2523 } 2524 case bitc::FUNC_CODE_INST_STORE: { // STORE2:[ptrty, ptr, val, align, vol] 2525 unsigned OpNum = 0; 2526 Value *Val, *Ptr; 2527 if (getValueTypePair(Record, OpNum, NextValueNo, Ptr) || 2528 getValue(Record, OpNum, 2529 cast<PointerType>(Ptr->getType())->getElementType(), Val) || 2530 OpNum+2 != Record.size()) 2531 return Error("Invalid STORE record"); 2532 2533 I = new StoreInst(Val, Ptr, Record[OpNum+1], (1 << Record[OpNum]) >> 1); 2534 InstructionList.push_back(I); 2535 break; 2536 } 2537 case bitc::FUNC_CODE_INST_STOREATOMIC: { 2538 // STOREATOMIC: [ptrty, ptr, val, align, vol, ordering, synchscope] 2539 unsigned OpNum = 0; 2540 Value *Val, *Ptr; 2541 if (getValueTypePair(Record, OpNum, NextValueNo, Ptr) || 2542 getValue(Record, OpNum, 2543 cast<PointerType>(Ptr->getType())->getElementType(), Val) || 2544 OpNum+4 != Record.size()) 2545 return Error("Invalid STOREATOMIC record"); 2546 2547 AtomicOrdering Ordering = GetDecodedOrdering(Record[OpNum+2]); 2548 if (Ordering == NotAtomic || Ordering == Acquire || 2549 Ordering == AcquireRelease) 2550 return Error("Invalid STOREATOMIC record"); 2551 SynchronizationScope SynchScope = GetDecodedSynchScope(Record[OpNum+3]); 2552 if (Ordering != NotAtomic && Record[OpNum] == 0) 2553 return Error("Invalid STOREATOMIC record"); 2554 2555 I = new StoreInst(Val, Ptr, Record[OpNum+1], (1 << Record[OpNum]) >> 1, 2556 Ordering, SynchScope); 2557 InstructionList.push_back(I); 2558 break; 2559 } 2560 case bitc::FUNC_CODE_INST_CMPXCHG: { 2561 // CMPXCHG:[ptrty, ptr, cmp, new, vol, ordering, synchscope] 2562 unsigned OpNum = 0; 2563 Value *Ptr, *Cmp, *New; 2564 if (getValueTypePair(Record, OpNum, NextValueNo, Ptr) || 2565 getValue(Record, OpNum, 2566 cast<PointerType>(Ptr->getType())->getElementType(), Cmp) || 2567 getValue(Record, OpNum, 2568 cast<PointerType>(Ptr->getType())->getElementType(), New) || 2569 OpNum+3 != Record.size()) 2570 return Error("Invalid CMPXCHG record"); 2571 AtomicOrdering Ordering = GetDecodedOrdering(Record[OpNum+1]); 2572 if (Ordering == NotAtomic || Ordering == Unordered) 2573 return Error("Invalid CMPXCHG record"); 2574 SynchronizationScope SynchScope = GetDecodedSynchScope(Record[OpNum+2]); 2575 I = new AtomicCmpXchgInst(Ptr, Cmp, New, Ordering, SynchScope); 2576 cast<AtomicCmpXchgInst>(I)->setVolatile(Record[OpNum]); 2577 InstructionList.push_back(I); 2578 break; 2579 } 2580 case bitc::FUNC_CODE_INST_ATOMICRMW: { 2581 // ATOMICRMW:[ptrty, ptr, val, op, vol, ordering, synchscope] 2582 unsigned OpNum = 0; 2583 Value *Ptr, *Val; 2584 if (getValueTypePair(Record, OpNum, NextValueNo, Ptr) || 2585 getValue(Record, OpNum, 2586 cast<PointerType>(Ptr->getType())->getElementType(), Val) || 2587 OpNum+4 != Record.size()) 2588 return Error("Invalid ATOMICRMW record"); 2589 AtomicRMWInst::BinOp Operation = GetDecodedRMWOperation(Record[OpNum]); 2590 if (Operation < AtomicRMWInst::FIRST_BINOP || 2591 Operation > AtomicRMWInst::LAST_BINOP) 2592 return Error("Invalid ATOMICRMW record"); 2593 AtomicOrdering Ordering = GetDecodedOrdering(Record[OpNum+2]); 2594 if (Ordering == NotAtomic || Ordering == Unordered) 2595 return Error("Invalid ATOMICRMW record"); 2596 SynchronizationScope SynchScope = GetDecodedSynchScope(Record[OpNum+3]); 2597 I = new AtomicRMWInst(Operation, Ptr, Val, Ordering, SynchScope); 2598 cast<AtomicRMWInst>(I)->setVolatile(Record[OpNum+1]); 2599 InstructionList.push_back(I); 2600 break; 2601 } 2602 case bitc::FUNC_CODE_INST_FENCE: { // FENCE:[ordering, synchscope] 2603 if (2 != Record.size()) 2604 return Error("Invalid FENCE record"); 2605 AtomicOrdering Ordering = GetDecodedOrdering(Record[0]); 2606 if (Ordering == NotAtomic || Ordering == Unordered || 2607 Ordering == Monotonic) 2608 return Error("Invalid FENCE record"); 2609 SynchronizationScope SynchScope = GetDecodedSynchScope(Record[1]); 2610 I = new FenceInst(Context, Ordering, SynchScope); 2611 InstructionList.push_back(I); 2612 break; 2613 } 2614 case bitc::FUNC_CODE_INST_CALL: { 2615 // CALL: [paramattrs, cc, fnty, fnid, arg0, arg1...] 2616 if (Record.size() < 3) 2617 return Error("Invalid CALL record"); 2618 2619 AttrListPtr PAL = getAttributes(Record[0]); 2620 unsigned CCInfo = Record[1]; 2621 2622 unsigned OpNum = 2; 2623 Value *Callee; 2624 if (getValueTypePair(Record, OpNum, NextValueNo, Callee)) 2625 return Error("Invalid CALL record"); 2626 2627 PointerType *OpTy = dyn_cast<PointerType>(Callee->getType()); 2628 FunctionType *FTy = 0; 2629 if (OpTy) FTy = dyn_cast<FunctionType>(OpTy->getElementType()); 2630 if (!FTy || Record.size() < FTy->getNumParams()+OpNum) 2631 return Error("Invalid CALL record"); 2632 2633 SmallVector<Value*, 16> Args; 2634 // Read the fixed params. 2635 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) { 2636 if (FTy->getParamType(i)->isLabelTy()) 2637 Args.push_back(getBasicBlock(Record[OpNum])); 2638 else 2639 Args.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i))); 2640 if (Args.back() == 0) return Error("Invalid CALL record"); 2641 } 2642 2643 // Read type/value pairs for varargs params. 2644 if (!FTy->isVarArg()) { 2645 if (OpNum != Record.size()) 2646 return Error("Invalid CALL record"); 2647 } else { 2648 while (OpNum != Record.size()) { 2649 Value *Op; 2650 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 2651 return Error("Invalid CALL record"); 2652 Args.push_back(Op); 2653 } 2654 } 2655 2656 I = CallInst::Create(Callee, Args); 2657 InstructionList.push_back(I); 2658 cast<CallInst>(I)->setCallingConv( 2659 static_cast<CallingConv::ID>(CCInfo>>1)); 2660 cast<CallInst>(I)->setTailCall(CCInfo & 1); 2661 cast<CallInst>(I)->setAttributes(PAL); 2662 break; 2663 } 2664 case bitc::FUNC_CODE_INST_VAARG: { // VAARG: [valistty, valist, instty] 2665 if (Record.size() < 3) 2666 return Error("Invalid VAARG record"); 2667 Type *OpTy = getTypeByID(Record[0]); 2668 Value *Op = getFnValueByID(Record[1], OpTy); 2669 Type *ResTy = getTypeByID(Record[2]); 2670 if (!OpTy || !Op || !ResTy) 2671 return Error("Invalid VAARG record"); 2672 I = new VAArgInst(Op, ResTy); 2673 InstructionList.push_back(I); 2674 break; 2675 } 2676 } 2677 2678 // Add instruction to end of current BB. If there is no current BB, reject 2679 // this file. 2680 if (CurBB == 0) { 2681 delete I; 2682 return Error("Invalid instruction with no BB"); 2683 } 2684 CurBB->getInstList().push_back(I); 2685 2686 // If this was a terminator instruction, move to the next block. 2687 if (isa<TerminatorInst>(I)) { 2688 ++CurBBNo; 2689 CurBB = CurBBNo < FunctionBBs.size() ? FunctionBBs[CurBBNo] : 0; 2690 } 2691 2692 // Non-void values get registered in the value table for future use. 2693 if (I && !I->getType()->isVoidTy()) 2694 ValueList.AssignValue(I, NextValueNo++); 2695 } 2696 2697 // Check the function list for unresolved values. 2698 if (Argument *A = dyn_cast<Argument>(ValueList.back())) { 2699 if (A->getParent() == 0) { 2700 // We found at least one unresolved value. Nuke them all to avoid leaks. 2701 for (unsigned i = ModuleValueListSize, e = ValueList.size(); i != e; ++i){ 2702 if ((A = dyn_cast<Argument>(ValueList[i])) && A->getParent() == 0) { 2703 A->replaceAllUsesWith(UndefValue::get(A->getType())); 2704 delete A; 2705 } 2706 } 2707 return Error("Never resolved value found in function!"); 2708 } 2709 } 2710 2711 // FIXME: Check for unresolved forward-declared metadata references 2712 // and clean up leaks. 2713 2714 // See if anything took the address of blocks in this function. If so, 2715 // resolve them now. 2716 DenseMap<Function*, std::vector<BlockAddrRefTy> >::iterator BAFRI = 2717 BlockAddrFwdRefs.find(F); 2718 if (BAFRI != BlockAddrFwdRefs.end()) { 2719 std::vector<BlockAddrRefTy> &RefList = BAFRI->second; 2720 for (unsigned i = 0, e = RefList.size(); i != e; ++i) { 2721 unsigned BlockIdx = RefList[i].first; 2722 if (BlockIdx >= FunctionBBs.size()) 2723 return Error("Invalid blockaddress block #"); 2724 2725 GlobalVariable *FwdRef = RefList[i].second; 2726 FwdRef->replaceAllUsesWith(BlockAddress::get(F, FunctionBBs[BlockIdx])); 2727 FwdRef->eraseFromParent(); 2728 } 2729 2730 BlockAddrFwdRefs.erase(BAFRI); 2731 } 2732 2733 // Trim the value list down to the size it was before we parsed this function. 2734 ValueList.shrinkTo(ModuleValueListSize); 2735 MDValueList.shrinkTo(ModuleMDValueListSize); 2736 std::vector<BasicBlock*>().swap(FunctionBBs); 2737 return false; 2738 } 2739 2740 /// FindFunctionInStream - Find the function body in the bitcode stream 2741 bool BitcodeReader::FindFunctionInStream(Function *F, 2742 DenseMap<Function*, uint64_t>::iterator DeferredFunctionInfoIterator) { 2743 while (DeferredFunctionInfoIterator->second == 0) { 2744 if (Stream.AtEndOfStream()) 2745 return Error("Could not find Function in stream"); 2746 // ParseModule will parse the next body in the stream and set its 2747 // position in the DeferredFunctionInfo map. 2748 if (ParseModule(true)) return true; 2749 } 2750 return false; 2751 } 2752 2753 //===----------------------------------------------------------------------===// 2754 // GVMaterializer implementation 2755 //===----------------------------------------------------------------------===// 2756 2757 2758 bool BitcodeReader::isMaterializable(const GlobalValue *GV) const { 2759 if (const Function *F = dyn_cast<Function>(GV)) { 2760 return F->isDeclaration() && 2761 DeferredFunctionInfo.count(const_cast<Function*>(F)); 2762 } 2763 return false; 2764 } 2765 2766 bool BitcodeReader::Materialize(GlobalValue *GV, std::string *ErrInfo) { 2767 Function *F = dyn_cast<Function>(GV); 2768 // If it's not a function or is already material, ignore the request. 2769 if (!F || !F->isMaterializable()) return false; 2770 2771 DenseMap<Function*, uint64_t>::iterator DFII = DeferredFunctionInfo.find(F); 2772 assert(DFII != DeferredFunctionInfo.end() && "Deferred function not found!"); 2773 // If its position is recorded as 0, its body is somewhere in the stream 2774 // but we haven't seen it yet. 2775 if (DFII->second == 0) 2776 if (LazyStreamer && FindFunctionInStream(F, DFII)) return true; 2777 2778 // Move the bit stream to the saved position of the deferred function body. 2779 Stream.JumpToBit(DFII->second); 2780 2781 if (ParseFunctionBody(F)) { 2782 if (ErrInfo) *ErrInfo = ErrorString; 2783 return true; 2784 } 2785 2786 // Upgrade any old intrinsic calls in the function. 2787 for (UpgradedIntrinsicMap::iterator I = UpgradedIntrinsics.begin(), 2788 E = UpgradedIntrinsics.end(); I != E; ++I) { 2789 if (I->first != I->second) { 2790 for (Value::use_iterator UI = I->first->use_begin(), 2791 UE = I->first->use_end(); UI != UE; ) { 2792 if (CallInst* CI = dyn_cast<CallInst>(*UI++)) 2793 UpgradeIntrinsicCall(CI, I->second); 2794 } 2795 } 2796 } 2797 2798 return false; 2799 } 2800 2801 bool BitcodeReader::isDematerializable(const GlobalValue *GV) const { 2802 const Function *F = dyn_cast<Function>(GV); 2803 if (!F || F->isDeclaration()) 2804 return false; 2805 return DeferredFunctionInfo.count(const_cast<Function*>(F)); 2806 } 2807 2808 void BitcodeReader::Dematerialize(GlobalValue *GV) { 2809 Function *F = dyn_cast<Function>(GV); 2810 // If this function isn't dematerializable, this is a noop. 2811 if (!F || !isDematerializable(F)) 2812 return; 2813 2814 assert(DeferredFunctionInfo.count(F) && "No info to read function later?"); 2815 2816 // Just forget the function body, we can remat it later. 2817 F->deleteBody(); 2818 } 2819 2820 2821 bool BitcodeReader::MaterializeModule(Module *M, std::string *ErrInfo) { 2822 assert(M == TheModule && 2823 "Can only Materialize the Module this BitcodeReader is attached to."); 2824 // Iterate over the module, deserializing any functions that are still on 2825 // disk. 2826 for (Module::iterator F = TheModule->begin(), E = TheModule->end(); 2827 F != E; ++F) 2828 if (F->isMaterializable() && 2829 Materialize(F, ErrInfo)) 2830 return true; 2831 2832 // At this point, if there are any function bodies, the current bit is 2833 // pointing to the END_BLOCK record after them. Now make sure the rest 2834 // of the bits in the module have been read. 2835 if (NextUnreadBit) 2836 ParseModule(true); 2837 2838 // Upgrade any intrinsic calls that slipped through (should not happen!) and 2839 // delete the old functions to clean up. We can't do this unless the entire 2840 // module is materialized because there could always be another function body 2841 // with calls to the old function. 2842 for (std::vector<std::pair<Function*, Function*> >::iterator I = 2843 UpgradedIntrinsics.begin(), E = UpgradedIntrinsics.end(); I != E; ++I) { 2844 if (I->first != I->second) { 2845 for (Value::use_iterator UI = I->first->use_begin(), 2846 UE = I->first->use_end(); UI != UE; ) { 2847 if (CallInst* CI = dyn_cast<CallInst>(*UI++)) 2848 UpgradeIntrinsicCall(CI, I->second); 2849 } 2850 if (!I->first->use_empty()) 2851 I->first->replaceAllUsesWith(I->second); 2852 I->first->eraseFromParent(); 2853 } 2854 } 2855 std::vector<std::pair<Function*, Function*> >().swap(UpgradedIntrinsics); 2856 2857 return false; 2858 } 2859 2860 bool BitcodeReader::InitStream() { 2861 if (LazyStreamer) return InitLazyStream(); 2862 return InitStreamFromBuffer(); 2863 } 2864 2865 bool BitcodeReader::InitStreamFromBuffer() { 2866 const unsigned char *BufPtr = (unsigned char *)Buffer->getBufferStart(); 2867 const unsigned char *BufEnd = BufPtr+Buffer->getBufferSize(); 2868 2869 if (Buffer->getBufferSize() & 3) { 2870 if (!isRawBitcode(BufPtr, BufEnd) && !isBitcodeWrapper(BufPtr, BufEnd)) 2871 return Error("Invalid bitcode signature"); 2872 else 2873 return Error("Bitcode stream should be a multiple of 4 bytes in length"); 2874 } 2875 2876 // If we have a wrapper header, parse it and ignore the non-bc file contents. 2877 // The magic number is 0x0B17C0DE stored in little endian. 2878 if (isBitcodeWrapper(BufPtr, BufEnd)) 2879 if (SkipBitcodeWrapperHeader(BufPtr, BufEnd, true)) 2880 return Error("Invalid bitcode wrapper header"); 2881 2882 StreamFile.reset(new BitstreamReader(BufPtr, BufEnd)); 2883 Stream.init(*StreamFile); 2884 2885 return false; 2886 } 2887 2888 bool BitcodeReader::InitLazyStream() { 2889 // Check and strip off the bitcode wrapper; BitstreamReader expects never to 2890 // see it. 2891 StreamingMemoryObject *Bytes = new StreamingMemoryObject(LazyStreamer); 2892 StreamFile.reset(new BitstreamReader(Bytes)); 2893 Stream.init(*StreamFile); 2894 2895 unsigned char buf[16]; 2896 if (Bytes->readBytes(0, 16, buf, NULL) == -1) 2897 return Error("Bitcode stream must be at least 16 bytes in length"); 2898 2899 if (!isBitcode(buf, buf + 16)) 2900 return Error("Invalid bitcode signature"); 2901 2902 if (isBitcodeWrapper(buf, buf + 4)) { 2903 const unsigned char *bitcodeStart = buf; 2904 const unsigned char *bitcodeEnd = buf + 16; 2905 SkipBitcodeWrapperHeader(bitcodeStart, bitcodeEnd, false); 2906 Bytes->dropLeadingBytes(bitcodeStart - buf); 2907 Bytes->setKnownObjectSize(bitcodeEnd - bitcodeStart); 2908 } 2909 return false; 2910 } 2911 2912 //===----------------------------------------------------------------------===// 2913 // External interface 2914 //===----------------------------------------------------------------------===// 2915 2916 /// getLazyBitcodeModule - lazy function-at-a-time loading from a file. 2917 /// 2918 Module *llvm::getLazyBitcodeModule(MemoryBuffer *Buffer, 2919 LLVMContext& Context, 2920 std::string *ErrMsg) { 2921 Module *M = new Module(Buffer->getBufferIdentifier(), Context); 2922 BitcodeReader *R = new BitcodeReader(Buffer, Context); 2923 M->setMaterializer(R); 2924 if (R->ParseBitcodeInto(M)) { 2925 if (ErrMsg) 2926 *ErrMsg = R->getErrorString(); 2927 2928 delete M; // Also deletes R. 2929 return 0; 2930 } 2931 // Have the BitcodeReader dtor delete 'Buffer'. 2932 R->setBufferOwned(true); 2933 2934 R->materializeForwardReferencedFunctions(); 2935 2936 return M; 2937 } 2938 2939 2940 Module *llvm::getStreamedBitcodeModule(const std::string &name, 2941 DataStreamer *streamer, 2942 LLVMContext &Context, 2943 std::string *ErrMsg) { 2944 Module *M = new Module(name, Context); 2945 BitcodeReader *R = new BitcodeReader(streamer, Context); 2946 M->setMaterializer(R); 2947 if (R->ParseBitcodeInto(M)) { 2948 if (ErrMsg) 2949 *ErrMsg = R->getErrorString(); 2950 delete M; // Also deletes R. 2951 return 0; 2952 } 2953 R->setBufferOwned(false); // no buffer to delete 2954 return M; 2955 } 2956 2957 /// ParseBitcodeFile - Read the specified bitcode file, returning the module. 2958 /// If an error occurs, return null and fill in *ErrMsg if non-null. 2959 Module *llvm::ParseBitcodeFile(MemoryBuffer *Buffer, LLVMContext& Context, 2960 std::string *ErrMsg){ 2961 Module *M = getLazyBitcodeModule(Buffer, Context, ErrMsg); 2962 if (!M) return 0; 2963 2964 // Don't let the BitcodeReader dtor delete 'Buffer', regardless of whether 2965 // there was an error. 2966 static_cast<BitcodeReader*>(M->getMaterializer())->setBufferOwned(false); 2967 2968 // Read in the entire module, and destroy the BitcodeReader. 2969 if (M->MaterializeAllPermanently(ErrMsg)) { 2970 delete M; 2971 return 0; 2972 } 2973 2974 // TODO: Restore the use-lists to the in-memory state when the bitcode was 2975 // written. We must defer until the Module has been fully materialized. 2976 2977 return M; 2978 } 2979 2980 std::string llvm::getBitcodeTargetTriple(MemoryBuffer *Buffer, 2981 LLVMContext& Context, 2982 std::string *ErrMsg) { 2983 BitcodeReader *R = new BitcodeReader(Buffer, Context); 2984 // Don't let the BitcodeReader dtor delete 'Buffer'. 2985 R->setBufferOwned(false); 2986 2987 std::string Triple(""); 2988 if (R->ParseTriple(Triple)) 2989 if (ErrMsg) 2990 *ErrMsg = R->getErrorString(); 2991 2992 delete R; 2993 return Triple; 2994 } 2995