BitcodeReader.cpp revision e9b11b431308f4766b73cda93e38ec930c912122
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/Instructions.h" 20#include "llvm/LLVMContext.h" 21#include "llvm/MDNode.h" 22#include "llvm/Module.h" 23#include "llvm/AutoUpgrade.h" 24#include "llvm/ADT/SmallString.h" 25#include "llvm/ADT/SmallVector.h" 26#include "llvm/Support/MathExtras.h" 27#include "llvm/Support/MemoryBuffer.h" 28#include "llvm/OperandTraits.h" 29using namespace llvm; 30 31void BitcodeReader::FreeState() { 32 delete Buffer; 33 Buffer = 0; 34 std::vector<PATypeHolder>().swap(TypeList); 35 ValueList.clear(); 36 37 std::vector<AttrListPtr>().swap(MAttributes); 38 std::vector<BasicBlock*>().swap(FunctionBBs); 39 std::vector<Function*>().swap(FunctionsWithBodies); 40 DeferredFunctionInfo.clear(); 41} 42 43//===----------------------------------------------------------------------===// 44// Helper functions to implement forward reference resolution, etc. 45//===----------------------------------------------------------------------===// 46 47/// ConvertToString - Convert a string from a record into an std::string, return 48/// true on failure. 49template<typename StrTy> 50static bool ConvertToString(SmallVector<uint64_t, 64> &Record, unsigned Idx, 51 StrTy &Result) { 52 if (Idx > Record.size()) 53 return true; 54 55 for (unsigned i = Idx, e = Record.size(); i != e; ++i) 56 Result += (char)Record[i]; 57 return false; 58} 59 60static GlobalValue::LinkageTypes GetDecodedLinkage(unsigned Val) { 61 switch (Val) { 62 default: // Map unknown/new linkages to external 63 case 0: return GlobalValue::ExternalLinkage; 64 case 1: return GlobalValue::WeakAnyLinkage; 65 case 2: return GlobalValue::AppendingLinkage; 66 case 3: return GlobalValue::InternalLinkage; 67 case 4: return GlobalValue::LinkOnceAnyLinkage; 68 case 5: return GlobalValue::DLLImportLinkage; 69 case 6: return GlobalValue::DLLExportLinkage; 70 case 7: return GlobalValue::ExternalWeakLinkage; 71 case 8: return GlobalValue::CommonLinkage; 72 case 9: return GlobalValue::PrivateLinkage; 73 case 10: return GlobalValue::WeakODRLinkage; 74 case 11: return GlobalValue::LinkOnceODRLinkage; 75 case 12: return GlobalValue::AvailableExternallyLinkage; 76 } 77} 78 79static GlobalValue::VisibilityTypes GetDecodedVisibility(unsigned Val) { 80 switch (Val) { 81 default: // Map unknown visibilities to default. 82 case 0: return GlobalValue::DefaultVisibility; 83 case 1: return GlobalValue::HiddenVisibility; 84 case 2: return GlobalValue::ProtectedVisibility; 85 } 86} 87 88static int GetDecodedCastOpcode(unsigned Val) { 89 switch (Val) { 90 default: return -1; 91 case bitc::CAST_TRUNC : return Instruction::Trunc; 92 case bitc::CAST_ZEXT : return Instruction::ZExt; 93 case bitc::CAST_SEXT : return Instruction::SExt; 94 case bitc::CAST_FPTOUI : return Instruction::FPToUI; 95 case bitc::CAST_FPTOSI : return Instruction::FPToSI; 96 case bitc::CAST_UITOFP : return Instruction::UIToFP; 97 case bitc::CAST_SITOFP : return Instruction::SIToFP; 98 case bitc::CAST_FPTRUNC : return Instruction::FPTrunc; 99 case bitc::CAST_FPEXT : return Instruction::FPExt; 100 case bitc::CAST_PTRTOINT: return Instruction::PtrToInt; 101 case bitc::CAST_INTTOPTR: return Instruction::IntToPtr; 102 case bitc::CAST_BITCAST : return Instruction::BitCast; 103 } 104} 105static int GetDecodedBinaryOpcode(unsigned Val, const Type *Ty) { 106 switch (Val) { 107 default: return -1; 108 case bitc::BINOP_ADD: 109 return Ty->isFPOrFPVector() ? Instruction::FAdd : Instruction::Add; 110 case bitc::BINOP_SUB: 111 return Ty->isFPOrFPVector() ? Instruction::FSub : Instruction::Sub; 112 case bitc::BINOP_MUL: 113 return Ty->isFPOrFPVector() ? Instruction::FMul : Instruction::Mul; 114 case bitc::BINOP_UDIV: return Instruction::UDiv; 115 case bitc::BINOP_SDIV: 116 return Ty->isFPOrFPVector() ? Instruction::FDiv : Instruction::SDiv; 117 case bitc::BINOP_UREM: return Instruction::URem; 118 case bitc::BINOP_SREM: 119 return Ty->isFPOrFPVector() ? Instruction::FRem : Instruction::SRem; 120 case bitc::BINOP_SHL: return Instruction::Shl; 121 case bitc::BINOP_LSHR: return Instruction::LShr; 122 case bitc::BINOP_ASHR: return Instruction::AShr; 123 case bitc::BINOP_AND: return Instruction::And; 124 case bitc::BINOP_OR: return Instruction::Or; 125 case bitc::BINOP_XOR: return Instruction::Xor; 126 } 127} 128 129namespace llvm { 130namespace { 131 /// @brief A class for maintaining the slot number definition 132 /// as a placeholder for the actual definition for forward constants defs. 133 class ConstantPlaceHolder : public ConstantExpr { 134 ConstantPlaceHolder(); // DO NOT IMPLEMENT 135 void operator=(const ConstantPlaceHolder &); // DO NOT IMPLEMENT 136 public: 137 // allocate space for exactly one operand 138 void *operator new(size_t s) { 139 return User::operator new(s, 1); 140 } 141 explicit ConstantPlaceHolder(const Type *Ty, LLVMContext& Context) 142 : ConstantExpr(Ty, Instruction::UserOp1, &Op<0>(), 1) { 143 Op<0>() = Context.getUndef(Type::Int32Ty); 144 } 145 146 /// @brief Methods to support type inquiry through isa, cast, and dyn_cast. 147 static inline bool classof(const ConstantPlaceHolder *) { return true; } 148 static bool classof(const Value *V) { 149 return isa<ConstantExpr>(V) && 150 cast<ConstantExpr>(V)->getOpcode() == Instruction::UserOp1; 151 } 152 153 154 /// Provide fast operand accessors 155 //DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value); 156 }; 157} 158 159// FIXME: can we inherit this from ConstantExpr? 160template <> 161struct OperandTraits<ConstantPlaceHolder> : FixedNumOperandTraits<1> { 162}; 163} 164 165 166void BitcodeReaderValueList::AssignValue(Value *V, unsigned Idx) { 167 if (Idx == size()) { 168 push_back(V); 169 return; 170 } 171 172 if (Idx >= size()) 173 resize(Idx+1); 174 175 WeakVH &OldV = ValuePtrs[Idx]; 176 if (OldV == 0) { 177 OldV = V; 178 return; 179 } 180 181 // Handle constants and non-constants (e.g. instrs) differently for 182 // efficiency. 183 if (Constant *PHC = dyn_cast<Constant>(&*OldV)) { 184 ResolveConstants.push_back(std::make_pair(PHC, Idx)); 185 OldV = V; 186 } else { 187 // If there was a forward reference to this value, replace it. 188 Value *PrevVal = OldV; 189 OldV->replaceAllUsesWith(V); 190 delete PrevVal; 191 } 192} 193 194 195Constant *BitcodeReaderValueList::getConstantFwdRef(unsigned Idx, 196 const Type *Ty) { 197 if (Idx >= size()) 198 resize(Idx + 1); 199 200 if (Value *V = ValuePtrs[Idx]) { 201 assert(Ty == V->getType() && "Type mismatch in constant table!"); 202 return cast<Constant>(V); 203 } 204 205 // Create and return a placeholder, which will later be RAUW'd. 206 Constant *C = new ConstantPlaceHolder(Ty, Context); 207 ValuePtrs[Idx] = C; 208 return C; 209} 210 211Value *BitcodeReaderValueList::getValueFwdRef(unsigned Idx, const Type *Ty) { 212 if (Idx >= size()) 213 resize(Idx + 1); 214 215 if (Value *V = ValuePtrs[Idx]) { 216 assert((Ty == 0 || Ty == V->getType()) && "Type mismatch in value table!"); 217 return V; 218 } 219 220 // No type specified, must be invalid reference. 221 if (Ty == 0) return 0; 222 223 // Create and return a placeholder, which will later be RAUW'd. 224 Value *V = new Argument(Ty); 225 ValuePtrs[Idx] = V; 226 return V; 227} 228 229/// ResolveConstantForwardRefs - Once all constants are read, this method bulk 230/// resolves any forward references. The idea behind this is that we sometimes 231/// get constants (such as large arrays) which reference *many* forward ref 232/// constants. Replacing each of these causes a lot of thrashing when 233/// building/reuniquing the constant. Instead of doing this, we look at all the 234/// uses and rewrite all the place holders at once for any constant that uses 235/// a placeholder. 236void BitcodeReaderValueList::ResolveConstantForwardRefs() { 237 // Sort the values by-pointer so that they are efficient to look up with a 238 // binary search. 239 std::sort(ResolveConstants.begin(), ResolveConstants.end()); 240 241 SmallVector<Constant*, 64> NewOps; 242 243 while (!ResolveConstants.empty()) { 244 Value *RealVal = operator[](ResolveConstants.back().second); 245 Constant *Placeholder = ResolveConstants.back().first; 246 ResolveConstants.pop_back(); 247 248 // Loop over all users of the placeholder, updating them to reference the 249 // new value. If they reference more than one placeholder, update them all 250 // at once. 251 while (!Placeholder->use_empty()) { 252 Value::use_iterator UI = Placeholder->use_begin(); 253 254 // If the using object isn't uniqued, just update the operands. This 255 // handles instructions and initializers for global variables. 256 if (!isa<Constant>(*UI) || isa<GlobalValue>(*UI)) { 257 UI.getUse().set(RealVal); 258 continue; 259 } 260 261 // Otherwise, we have a constant that uses the placeholder. Replace that 262 // constant with a new constant that has *all* placeholder uses updated. 263 Constant *UserC = cast<Constant>(*UI); 264 for (User::op_iterator I = UserC->op_begin(), E = UserC->op_end(); 265 I != E; ++I) { 266 Value *NewOp; 267 if (!isa<ConstantPlaceHolder>(*I)) { 268 // Not a placeholder reference. 269 NewOp = *I; 270 } else if (*I == Placeholder) { 271 // Common case is that it just references this one placeholder. 272 NewOp = RealVal; 273 } else { 274 // Otherwise, look up the placeholder in ResolveConstants. 275 ResolveConstantsTy::iterator It = 276 std::lower_bound(ResolveConstants.begin(), ResolveConstants.end(), 277 std::pair<Constant*, unsigned>(cast<Constant>(*I), 278 0)); 279 assert(It != ResolveConstants.end() && It->first == *I); 280 NewOp = operator[](It->second); 281 } 282 283 NewOps.push_back(cast<Constant>(NewOp)); 284 } 285 286 // Make the new constant. 287 Constant *NewC; 288 if (ConstantArray *UserCA = dyn_cast<ConstantArray>(UserC)) { 289 NewC = Context.getConstantArray(UserCA->getType(), &NewOps[0], 290 NewOps.size()); 291 } else if (ConstantStruct *UserCS = dyn_cast<ConstantStruct>(UserC)) { 292 NewC = Context.getConstantStruct(&NewOps[0], NewOps.size(), 293 UserCS->getType()->isPacked()); 294 } else if (isa<ConstantVector>(UserC)) { 295 NewC = Context.getConstantVector(&NewOps[0], NewOps.size()); 296 } else { 297 assert(isa<ConstantExpr>(UserC) && "Must be a ConstantExpr."); 298 NewC = cast<ConstantExpr>(UserC)->getWithOperands(&NewOps[0], 299 NewOps.size()); 300 } 301 302 UserC->replaceAllUsesWith(NewC); 303 UserC->destroyConstant(); 304 NewOps.clear(); 305 } 306 307 // Update all ValueHandles, they should be the only users at this point. 308 Placeholder->replaceAllUsesWith(RealVal); 309 delete Placeholder; 310 } 311} 312 313 314const Type *BitcodeReader::getTypeByID(unsigned ID, bool isTypeTable) { 315 // If the TypeID is in range, return it. 316 if (ID < TypeList.size()) 317 return TypeList[ID].get(); 318 if (!isTypeTable) return 0; 319 320 // The type table allows forward references. Push as many Opaque types as 321 // needed to get up to ID. 322 while (TypeList.size() <= ID) 323 TypeList.push_back(Context.getOpaqueType()); 324 return TypeList.back().get(); 325} 326 327//===----------------------------------------------------------------------===// 328// Functions for parsing blocks from the bitcode file 329//===----------------------------------------------------------------------===// 330 331bool BitcodeReader::ParseAttributeBlock() { 332 if (Stream.EnterSubBlock(bitc::PARAMATTR_BLOCK_ID)) 333 return Error("Malformed block record"); 334 335 if (!MAttributes.empty()) 336 return Error("Multiple PARAMATTR blocks found!"); 337 338 SmallVector<uint64_t, 64> Record; 339 340 SmallVector<AttributeWithIndex, 8> Attrs; 341 342 // Read all the records. 343 while (1) { 344 unsigned Code = Stream.ReadCode(); 345 if (Code == bitc::END_BLOCK) { 346 if (Stream.ReadBlockEnd()) 347 return Error("Error at end of PARAMATTR block"); 348 return false; 349 } 350 351 if (Code == bitc::ENTER_SUBBLOCK) { 352 // No known subblocks, always skip them. 353 Stream.ReadSubBlockID(); 354 if (Stream.SkipBlock()) 355 return Error("Malformed block record"); 356 continue; 357 } 358 359 if (Code == bitc::DEFINE_ABBREV) { 360 Stream.ReadAbbrevRecord(); 361 continue; 362 } 363 364 // Read a record. 365 Record.clear(); 366 switch (Stream.ReadRecord(Code, Record)) { 367 default: // Default behavior: ignore. 368 break; 369 case bitc::PARAMATTR_CODE_ENTRY: { // ENTRY: [paramidx0, attr0, ...] 370 if (Record.size() & 1) 371 return Error("Invalid ENTRY record"); 372 373 // FIXME : Remove this autoupgrade code in LLVM 3.0. 374 // If Function attributes are using index 0 then transfer them 375 // to index ~0. Index 0 is used for return value attributes but used to be 376 // used for function attributes. 377 Attributes RetAttribute = Attribute::None; 378 Attributes FnAttribute = Attribute::None; 379 for (unsigned i = 0, e = Record.size(); i != e; i += 2) { 380 // FIXME: remove in LLVM 3.0 381 // The alignment is stored as a 16-bit raw value from bits 31--16. 382 // We shift the bits above 31 down by 11 bits. 383 384 unsigned Alignment = (Record[i+1] & (0xffffull << 16)) >> 16; 385 if (Alignment && !isPowerOf2_32(Alignment)) 386 return Error("Alignment is not a power of two."); 387 388 Attributes ReconstitutedAttr = Record[i+1] & 0xffff; 389 if (Alignment) 390 ReconstitutedAttr |= Attribute::constructAlignmentFromInt(Alignment); 391 ReconstitutedAttr |= (Record[i+1] & (0xffffull << 32)) >> 11; 392 Record[i+1] = ReconstitutedAttr; 393 394 if (Record[i] == 0) 395 RetAttribute = Record[i+1]; 396 else if (Record[i] == ~0U) 397 FnAttribute = Record[i+1]; 398 } 399 400 unsigned OldRetAttrs = (Attribute::NoUnwind|Attribute::NoReturn| 401 Attribute::ReadOnly|Attribute::ReadNone); 402 403 if (FnAttribute == Attribute::None && RetAttribute != Attribute::None && 404 (RetAttribute & OldRetAttrs) != 0) { 405 if (FnAttribute == Attribute::None) { // add a slot so they get added. 406 Record.push_back(~0U); 407 Record.push_back(0); 408 } 409 410 FnAttribute |= RetAttribute & OldRetAttrs; 411 RetAttribute &= ~OldRetAttrs; 412 } 413 414 for (unsigned i = 0, e = Record.size(); i != e; i += 2) { 415 if (Record[i] == 0) { 416 if (RetAttribute != Attribute::None) 417 Attrs.push_back(AttributeWithIndex::get(0, RetAttribute)); 418 } else if (Record[i] == ~0U) { 419 if (FnAttribute != Attribute::None) 420 Attrs.push_back(AttributeWithIndex::get(~0U, FnAttribute)); 421 } else if (Record[i+1] != Attribute::None) 422 Attrs.push_back(AttributeWithIndex::get(Record[i], Record[i+1])); 423 } 424 425 MAttributes.push_back(AttrListPtr::get(Attrs.begin(), Attrs.end())); 426 Attrs.clear(); 427 break; 428 } 429 } 430 } 431} 432 433 434bool BitcodeReader::ParseTypeTable() { 435 if (Stream.EnterSubBlock(bitc::TYPE_BLOCK_ID)) 436 return Error("Malformed block record"); 437 438 if (!TypeList.empty()) 439 return Error("Multiple TYPE_BLOCKs found!"); 440 441 SmallVector<uint64_t, 64> Record; 442 unsigned NumRecords = 0; 443 444 // Read all the records for this type table. 445 while (1) { 446 unsigned Code = Stream.ReadCode(); 447 if (Code == bitc::END_BLOCK) { 448 if (NumRecords != TypeList.size()) 449 return Error("Invalid type forward reference in TYPE_BLOCK"); 450 if (Stream.ReadBlockEnd()) 451 return Error("Error at end of type table block"); 452 return false; 453 } 454 455 if (Code == bitc::ENTER_SUBBLOCK) { 456 // No known subblocks, always skip them. 457 Stream.ReadSubBlockID(); 458 if (Stream.SkipBlock()) 459 return Error("Malformed block record"); 460 continue; 461 } 462 463 if (Code == bitc::DEFINE_ABBREV) { 464 Stream.ReadAbbrevRecord(); 465 continue; 466 } 467 468 // Read a record. 469 Record.clear(); 470 const Type *ResultTy = 0; 471 switch (Stream.ReadRecord(Code, Record)) { 472 default: // Default behavior: unknown type. 473 ResultTy = 0; 474 break; 475 case bitc::TYPE_CODE_NUMENTRY: // TYPE_CODE_NUMENTRY: [numentries] 476 // TYPE_CODE_NUMENTRY contains a count of the number of types in the 477 // type list. This allows us to reserve space. 478 if (Record.size() < 1) 479 return Error("Invalid TYPE_CODE_NUMENTRY record"); 480 TypeList.reserve(Record[0]); 481 continue; 482 case bitc::TYPE_CODE_VOID: // VOID 483 ResultTy = Type::VoidTy; 484 break; 485 case bitc::TYPE_CODE_FLOAT: // FLOAT 486 ResultTy = Type::FloatTy; 487 break; 488 case bitc::TYPE_CODE_DOUBLE: // DOUBLE 489 ResultTy = Type::DoubleTy; 490 break; 491 case bitc::TYPE_CODE_X86_FP80: // X86_FP80 492 ResultTy = Type::X86_FP80Ty; 493 break; 494 case bitc::TYPE_CODE_FP128: // FP128 495 ResultTy = Type::FP128Ty; 496 break; 497 case bitc::TYPE_CODE_PPC_FP128: // PPC_FP128 498 ResultTy = Type::PPC_FP128Ty; 499 break; 500 case bitc::TYPE_CODE_LABEL: // LABEL 501 ResultTy = Type::LabelTy; 502 break; 503 case bitc::TYPE_CODE_OPAQUE: // OPAQUE 504 ResultTy = 0; 505 break; 506 case bitc::TYPE_CODE_METADATA: // METADATA 507 ResultTy = Type::MetadataTy; 508 break; 509 case bitc::TYPE_CODE_INTEGER: // INTEGER: [width] 510 if (Record.size() < 1) 511 return Error("Invalid Integer type record"); 512 513 ResultTy = Context.getIntegerType(Record[0]); 514 break; 515 case bitc::TYPE_CODE_POINTER: { // POINTER: [pointee type] or 516 // [pointee type, address space] 517 if (Record.size() < 1) 518 return Error("Invalid POINTER type record"); 519 unsigned AddressSpace = 0; 520 if (Record.size() == 2) 521 AddressSpace = Record[1]; 522 ResultTy = Context.getPointerType(getTypeByID(Record[0], true), 523 AddressSpace); 524 break; 525 } 526 case bitc::TYPE_CODE_FUNCTION: { 527 // FIXME: attrid is dead, remove it in LLVM 3.0 528 // FUNCTION: [vararg, attrid, retty, paramty x N] 529 if (Record.size() < 3) 530 return Error("Invalid FUNCTION type record"); 531 std::vector<const Type*> ArgTys; 532 for (unsigned i = 3, e = Record.size(); i != e; ++i) 533 ArgTys.push_back(getTypeByID(Record[i], true)); 534 535 ResultTy = Context.getFunctionType(getTypeByID(Record[2], true), ArgTys, 536 Record[0]); 537 break; 538 } 539 case bitc::TYPE_CODE_STRUCT: { // STRUCT: [ispacked, eltty x N] 540 if (Record.size() < 1) 541 return Error("Invalid STRUCT type record"); 542 std::vector<const Type*> EltTys; 543 for (unsigned i = 1, e = Record.size(); i != e; ++i) 544 EltTys.push_back(getTypeByID(Record[i], true)); 545 ResultTy = Context.getStructType(EltTys, Record[0]); 546 break; 547 } 548 case bitc::TYPE_CODE_ARRAY: // ARRAY: [numelts, eltty] 549 if (Record.size() < 2) 550 return Error("Invalid ARRAY type record"); 551 ResultTy = Context.getArrayType(getTypeByID(Record[1], true), Record[0]); 552 break; 553 case bitc::TYPE_CODE_VECTOR: // VECTOR: [numelts, eltty] 554 if (Record.size() < 2) 555 return Error("Invalid VECTOR type record"); 556 ResultTy = Context.getVectorType(getTypeByID(Record[1], true), Record[0]); 557 break; 558 } 559 560 if (NumRecords == TypeList.size()) { 561 // If this is a new type slot, just append it. 562 TypeList.push_back(ResultTy ? ResultTy : Context.getOpaqueType()); 563 ++NumRecords; 564 } else if (ResultTy == 0) { 565 // Otherwise, this was forward referenced, so an opaque type was created, 566 // but the result type is actually just an opaque. Leave the one we 567 // created previously. 568 ++NumRecords; 569 } else { 570 // Otherwise, this was forward referenced, so an opaque type was created. 571 // Resolve the opaque type to the real type now. 572 assert(NumRecords < TypeList.size() && "Typelist imbalance"); 573 const OpaqueType *OldTy = cast<OpaqueType>(TypeList[NumRecords++].get()); 574 575 // Don't directly push the new type on the Tab. Instead we want to replace 576 // the opaque type we previously inserted with the new concrete value. The 577 // refinement from the abstract (opaque) type to the new type causes all 578 // uses of the abstract type to use the concrete type (NewTy). This will 579 // also cause the opaque type to be deleted. 580 const_cast<OpaqueType*>(OldTy)->refineAbstractTypeTo(ResultTy); 581 582 // This should have replaced the old opaque type with the new type in the 583 // value table... or with a preexisting type that was already in the 584 // system. Let's just make sure it did. 585 assert(TypeList[NumRecords-1].get() != OldTy && 586 "refineAbstractType didn't work!"); 587 } 588 } 589} 590 591 592bool BitcodeReader::ParseTypeSymbolTable() { 593 if (Stream.EnterSubBlock(bitc::TYPE_SYMTAB_BLOCK_ID)) 594 return Error("Malformed block record"); 595 596 SmallVector<uint64_t, 64> Record; 597 598 // Read all the records for this type table. 599 std::string TypeName; 600 while (1) { 601 unsigned Code = Stream.ReadCode(); 602 if (Code == bitc::END_BLOCK) { 603 if (Stream.ReadBlockEnd()) 604 return Error("Error at end of type symbol table block"); 605 return false; 606 } 607 608 if (Code == bitc::ENTER_SUBBLOCK) { 609 // No known subblocks, always skip them. 610 Stream.ReadSubBlockID(); 611 if (Stream.SkipBlock()) 612 return Error("Malformed block record"); 613 continue; 614 } 615 616 if (Code == bitc::DEFINE_ABBREV) { 617 Stream.ReadAbbrevRecord(); 618 continue; 619 } 620 621 // Read a record. 622 Record.clear(); 623 switch (Stream.ReadRecord(Code, Record)) { 624 default: // Default behavior: unknown type. 625 break; 626 case bitc::TST_CODE_ENTRY: // TST_ENTRY: [typeid, namechar x N] 627 if (ConvertToString(Record, 1, TypeName)) 628 return Error("Invalid TST_ENTRY record"); 629 unsigned TypeID = Record[0]; 630 if (TypeID >= TypeList.size()) 631 return Error("Invalid Type ID in TST_ENTRY record"); 632 633 TheModule->addTypeName(TypeName, TypeList[TypeID].get()); 634 TypeName.clear(); 635 break; 636 } 637 } 638} 639 640bool BitcodeReader::ParseValueSymbolTable() { 641 if (Stream.EnterSubBlock(bitc::VALUE_SYMTAB_BLOCK_ID)) 642 return Error("Malformed block record"); 643 644 SmallVector<uint64_t, 64> Record; 645 646 // Read all the records for this value table. 647 SmallString<128> ValueName; 648 while (1) { 649 unsigned Code = Stream.ReadCode(); 650 if (Code == bitc::END_BLOCK) { 651 if (Stream.ReadBlockEnd()) 652 return Error("Error at end of value symbol table block"); 653 return false; 654 } 655 if (Code == bitc::ENTER_SUBBLOCK) { 656 // No known subblocks, always skip them. 657 Stream.ReadSubBlockID(); 658 if (Stream.SkipBlock()) 659 return Error("Malformed block record"); 660 continue; 661 } 662 663 if (Code == bitc::DEFINE_ABBREV) { 664 Stream.ReadAbbrevRecord(); 665 continue; 666 } 667 668 // Read a record. 669 Record.clear(); 670 switch (Stream.ReadRecord(Code, Record)) { 671 default: // Default behavior: unknown type. 672 break; 673 case bitc::VST_CODE_ENTRY: { // VST_ENTRY: [valueid, namechar x N] 674 if (ConvertToString(Record, 1, ValueName)) 675 return Error("Invalid VST_ENTRY record"); 676 unsigned ValueID = Record[0]; 677 if (ValueID >= ValueList.size()) 678 return Error("Invalid Value ID in VST_ENTRY record"); 679 Value *V = ValueList[ValueID]; 680 681 V->setName(&ValueName[0], ValueName.size()); 682 ValueName.clear(); 683 break; 684 } 685 case bitc::VST_CODE_BBENTRY: { 686 if (ConvertToString(Record, 1, ValueName)) 687 return Error("Invalid VST_BBENTRY record"); 688 BasicBlock *BB = getBasicBlock(Record[0]); 689 if (BB == 0) 690 return Error("Invalid BB ID in VST_BBENTRY record"); 691 692 BB->setName(&ValueName[0], ValueName.size()); 693 ValueName.clear(); 694 break; 695 } 696 } 697 } 698} 699 700/// DecodeSignRotatedValue - Decode a signed value stored with the sign bit in 701/// the LSB for dense VBR encoding. 702static uint64_t DecodeSignRotatedValue(uint64_t V) { 703 if ((V & 1) == 0) 704 return V >> 1; 705 if (V != 1) 706 return -(V >> 1); 707 // There is no such thing as -0 with integers. "-0" really means MININT. 708 return 1ULL << 63; 709} 710 711/// ResolveGlobalAndAliasInits - Resolve all of the initializers for global 712/// values and aliases that we can. 713bool BitcodeReader::ResolveGlobalAndAliasInits() { 714 std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInitWorklist; 715 std::vector<std::pair<GlobalAlias*, unsigned> > AliasInitWorklist; 716 717 GlobalInitWorklist.swap(GlobalInits); 718 AliasInitWorklist.swap(AliasInits); 719 720 while (!GlobalInitWorklist.empty()) { 721 unsigned ValID = GlobalInitWorklist.back().second; 722 if (ValID >= ValueList.size()) { 723 // Not ready to resolve this yet, it requires something later in the file. 724 GlobalInits.push_back(GlobalInitWorklist.back()); 725 } else { 726 if (Constant *C = dyn_cast<Constant>(ValueList[ValID])) 727 GlobalInitWorklist.back().first->setInitializer(C); 728 else 729 return Error("Global variable initializer is not a constant!"); 730 } 731 GlobalInitWorklist.pop_back(); 732 } 733 734 while (!AliasInitWorklist.empty()) { 735 unsigned ValID = AliasInitWorklist.back().second; 736 if (ValID >= ValueList.size()) { 737 AliasInits.push_back(AliasInitWorklist.back()); 738 } else { 739 if (Constant *C = dyn_cast<Constant>(ValueList[ValID])) 740 AliasInitWorklist.back().first->setAliasee(C); 741 else 742 return Error("Alias initializer is not a constant!"); 743 } 744 AliasInitWorklist.pop_back(); 745 } 746 return false; 747} 748 749 750bool BitcodeReader::ParseConstants() { 751 if (Stream.EnterSubBlock(bitc::CONSTANTS_BLOCK_ID)) 752 return Error("Malformed block record"); 753 754 SmallVector<uint64_t, 64> Record; 755 756 // Read all the records for this value table. 757 const Type *CurTy = Type::Int32Ty; 758 unsigned NextCstNo = ValueList.size(); 759 while (1) { 760 unsigned Code = Stream.ReadCode(); 761 if (Code == bitc::END_BLOCK) 762 break; 763 764 if (Code == bitc::ENTER_SUBBLOCK) { 765 // No known subblocks, always skip them. 766 Stream.ReadSubBlockID(); 767 if (Stream.SkipBlock()) 768 return Error("Malformed block record"); 769 continue; 770 } 771 772 if (Code == bitc::DEFINE_ABBREV) { 773 Stream.ReadAbbrevRecord(); 774 continue; 775 } 776 777 // Read a record. 778 Record.clear(); 779 Value *V = 0; 780 switch (Stream.ReadRecord(Code, Record)) { 781 default: // Default behavior: unknown constant 782 case bitc::CST_CODE_UNDEF: // UNDEF 783 V = Context.getUndef(CurTy); 784 break; 785 case bitc::CST_CODE_SETTYPE: // SETTYPE: [typeid] 786 if (Record.empty()) 787 return Error("Malformed CST_SETTYPE record"); 788 if (Record[0] >= TypeList.size()) 789 return Error("Invalid Type ID in CST_SETTYPE record"); 790 CurTy = TypeList[Record[0]]; 791 continue; // Skip the ValueList manipulation. 792 case bitc::CST_CODE_NULL: // NULL 793 V = Context.getNullValue(CurTy); 794 break; 795 case bitc::CST_CODE_INTEGER: // INTEGER: [intval] 796 if (!isa<IntegerType>(CurTy) || Record.empty()) 797 return Error("Invalid CST_INTEGER record"); 798 V = Context.getConstantInt(CurTy, DecodeSignRotatedValue(Record[0])); 799 break; 800 case bitc::CST_CODE_WIDE_INTEGER: {// WIDE_INTEGER: [n x intval] 801 if (!isa<IntegerType>(CurTy) || Record.empty()) 802 return Error("Invalid WIDE_INTEGER record"); 803 804 unsigned NumWords = Record.size(); 805 SmallVector<uint64_t, 8> Words; 806 Words.resize(NumWords); 807 for (unsigned i = 0; i != NumWords; ++i) 808 Words[i] = DecodeSignRotatedValue(Record[i]); 809 V = Context.getConstantInt(APInt(cast<IntegerType>(CurTy)->getBitWidth(), 810 NumWords, &Words[0])); 811 break; 812 } 813 case bitc::CST_CODE_FLOAT: { // FLOAT: [fpval] 814 if (Record.empty()) 815 return Error("Invalid FLOAT record"); 816 if (CurTy == Type::FloatTy) 817 V = Context.getConstantFP(APFloat(APInt(32, (uint32_t)Record[0]))); 818 else if (CurTy == Type::DoubleTy) 819 V = Context.getConstantFP(APFloat(APInt(64, Record[0]))); 820 else if (CurTy == Type::X86_FP80Ty) { 821 // Bits are not stored the same way as a normal i80 APInt, compensate. 822 uint64_t Rearrange[2]; 823 Rearrange[0] = (Record[1] & 0xffffLL) | (Record[0] << 16); 824 Rearrange[1] = Record[0] >> 48; 825 V = Context.getConstantFP(APFloat(APInt(80, 2, Rearrange))); 826 } else if (CurTy == Type::FP128Ty) 827 V = Context.getConstantFP(APFloat(APInt(128, 2, &Record[0]), true)); 828 else if (CurTy == Type::PPC_FP128Ty) 829 V = Context.getConstantFP(APFloat(APInt(128, 2, &Record[0]))); 830 else 831 V = Context.getUndef(CurTy); 832 break; 833 } 834 835 case bitc::CST_CODE_AGGREGATE: {// AGGREGATE: [n x value number] 836 if (Record.empty()) 837 return Error("Invalid CST_AGGREGATE record"); 838 839 unsigned Size = Record.size(); 840 std::vector<Constant*> Elts; 841 842 if (const StructType *STy = dyn_cast<StructType>(CurTy)) { 843 for (unsigned i = 0; i != Size; ++i) 844 Elts.push_back(ValueList.getConstantFwdRef(Record[i], 845 STy->getElementType(i))); 846 V = Context.getConstantStruct(STy, Elts); 847 } else if (const ArrayType *ATy = dyn_cast<ArrayType>(CurTy)) { 848 const Type *EltTy = ATy->getElementType(); 849 for (unsigned i = 0; i != Size; ++i) 850 Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy)); 851 V = Context.getConstantArray(ATy, Elts); 852 } else if (const VectorType *VTy = dyn_cast<VectorType>(CurTy)) { 853 const Type *EltTy = VTy->getElementType(); 854 for (unsigned i = 0; i != Size; ++i) 855 Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy)); 856 V = Context.getConstantVector(Elts); 857 } else { 858 V = Context.getUndef(CurTy); 859 } 860 break; 861 } 862 case bitc::CST_CODE_STRING: { // STRING: [values] 863 if (Record.empty()) 864 return Error("Invalid CST_AGGREGATE record"); 865 866 const ArrayType *ATy = cast<ArrayType>(CurTy); 867 const Type *EltTy = ATy->getElementType(); 868 869 unsigned Size = Record.size(); 870 std::vector<Constant*> Elts; 871 for (unsigned i = 0; i != Size; ++i) 872 Elts.push_back(Context.getConstantInt(EltTy, Record[i])); 873 V = Context.getConstantArray(ATy, Elts); 874 break; 875 } 876 case bitc::CST_CODE_CSTRING: { // CSTRING: [values] 877 if (Record.empty()) 878 return Error("Invalid CST_AGGREGATE record"); 879 880 const ArrayType *ATy = cast<ArrayType>(CurTy); 881 const Type *EltTy = ATy->getElementType(); 882 883 unsigned Size = Record.size(); 884 std::vector<Constant*> Elts; 885 for (unsigned i = 0; i != Size; ++i) 886 Elts.push_back(Context.getConstantInt(EltTy, Record[i])); 887 Elts.push_back(Context.getNullValue(EltTy)); 888 V = Context.getConstantArray(ATy, Elts); 889 break; 890 } 891 case bitc::CST_CODE_CE_BINOP: { // CE_BINOP: [opcode, opval, opval] 892 if (Record.size() < 3) return Error("Invalid CE_BINOP record"); 893 int Opc = GetDecodedBinaryOpcode(Record[0], CurTy); 894 if (Opc < 0) { 895 V = Context.getUndef(CurTy); // Unknown binop. 896 } else { 897 Constant *LHS = ValueList.getConstantFwdRef(Record[1], CurTy); 898 Constant *RHS = ValueList.getConstantFwdRef(Record[2], CurTy); 899 V = Context.getConstantExpr(Opc, LHS, RHS); 900 } 901 break; 902 } 903 case bitc::CST_CODE_CE_CAST: { // CE_CAST: [opcode, opty, opval] 904 if (Record.size() < 3) return Error("Invalid CE_CAST record"); 905 int Opc = GetDecodedCastOpcode(Record[0]); 906 if (Opc < 0) { 907 V = Context.getUndef(CurTy); // Unknown cast. 908 } else { 909 const Type *OpTy = getTypeByID(Record[1]); 910 if (!OpTy) return Error("Invalid CE_CAST record"); 911 Constant *Op = ValueList.getConstantFwdRef(Record[2], OpTy); 912 V = Context.getConstantExprCast(Opc, Op, CurTy); 913 } 914 break; 915 } 916 case bitc::CST_CODE_CE_GEP: { // CE_GEP: [n x operands] 917 if (Record.size() & 1) return Error("Invalid CE_GEP record"); 918 SmallVector<Constant*, 16> Elts; 919 for (unsigned i = 0, e = Record.size(); i != e; i += 2) { 920 const Type *ElTy = getTypeByID(Record[i]); 921 if (!ElTy) return Error("Invalid CE_GEP record"); 922 Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], ElTy)); 923 } 924 V = Context.getConstantExprGetElementPtr(Elts[0], &Elts[1], 925 Elts.size()-1); 926 break; 927 } 928 case bitc::CST_CODE_CE_SELECT: // CE_SELECT: [opval#, opval#, opval#] 929 if (Record.size() < 3) return Error("Invalid CE_SELECT record"); 930 V = Context.getConstantExprSelect(ValueList.getConstantFwdRef(Record[0], 931 Type::Int1Ty), 932 ValueList.getConstantFwdRef(Record[1],CurTy), 933 ValueList.getConstantFwdRef(Record[2],CurTy)); 934 break; 935 case bitc::CST_CODE_CE_EXTRACTELT: { // CE_EXTRACTELT: [opty, opval, opval] 936 if (Record.size() < 3) return Error("Invalid CE_EXTRACTELT record"); 937 const VectorType *OpTy = 938 dyn_cast_or_null<VectorType>(getTypeByID(Record[0])); 939 if (OpTy == 0) return Error("Invalid CE_EXTRACTELT record"); 940 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 941 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], Type::Int32Ty); 942 V = Context.getConstantExprExtractElement(Op0, Op1); 943 break; 944 } 945 case bitc::CST_CODE_CE_INSERTELT: { // CE_INSERTELT: [opval, opval, opval] 946 const VectorType *OpTy = dyn_cast<VectorType>(CurTy); 947 if (Record.size() < 3 || OpTy == 0) 948 return Error("Invalid CE_INSERTELT record"); 949 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); 950 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], 951 OpTy->getElementType()); 952 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], Type::Int32Ty); 953 V = Context.getConstantExprInsertElement(Op0, Op1, Op2); 954 break; 955 } 956 case bitc::CST_CODE_CE_SHUFFLEVEC: { // CE_SHUFFLEVEC: [opval, opval, opval] 957 const VectorType *OpTy = dyn_cast<VectorType>(CurTy); 958 if (Record.size() < 3 || OpTy == 0) 959 return Error("Invalid CE_SHUFFLEVEC record"); 960 Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); 961 Constant *Op1 = ValueList.getConstantFwdRef(Record[1], OpTy); 962 const Type *ShufTy = Context.getVectorType(Type::Int32Ty, 963 OpTy->getNumElements()); 964 Constant *Op2 = ValueList.getConstantFwdRef(Record[2], ShufTy); 965 V = Context.getConstantExprShuffleVector(Op0, Op1, Op2); 966 break; 967 } 968 case bitc::CST_CODE_CE_SHUFVEC_EX: { // [opty, opval, opval, opval] 969 const VectorType *RTy = dyn_cast<VectorType>(CurTy); 970 const VectorType *OpTy = dyn_cast<VectorType>(getTypeByID(Record[0])); 971 if (Record.size() < 4 || RTy == 0 || OpTy == 0) 972 return Error("Invalid CE_SHUFVEC_EX record"); 973 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 974 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy); 975 const Type *ShufTy = Context.getVectorType(Type::Int32Ty, 976 RTy->getNumElements()); 977 Constant *Op2 = ValueList.getConstantFwdRef(Record[3], ShufTy); 978 V = Context.getConstantExprShuffleVector(Op0, Op1, Op2); 979 break; 980 } 981 case bitc::CST_CODE_CE_CMP: { // CE_CMP: [opty, opval, opval, pred] 982 if (Record.size() < 4) return Error("Invalid CE_CMP record"); 983 const Type *OpTy = getTypeByID(Record[0]); 984 if (OpTy == 0) return Error("Invalid CE_CMP record"); 985 Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); 986 Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy); 987 988 if (OpTy->isFloatingPoint()) 989 V = Context.getConstantExprFCmp(Record[3], Op0, Op1); 990 else 991 V = Context.getConstantExprICmp(Record[3], Op0, Op1); 992 break; 993 } 994 case bitc::CST_CODE_INLINEASM: { 995 if (Record.size() < 2) return Error("Invalid INLINEASM record"); 996 std::string AsmStr, ConstrStr; 997 bool HasSideEffects = Record[0]; 998 unsigned AsmStrSize = Record[1]; 999 if (2+AsmStrSize >= Record.size()) 1000 return Error("Invalid INLINEASM record"); 1001 unsigned ConstStrSize = Record[2+AsmStrSize]; 1002 if (3+AsmStrSize+ConstStrSize > Record.size()) 1003 return Error("Invalid INLINEASM record"); 1004 1005 for (unsigned i = 0; i != AsmStrSize; ++i) 1006 AsmStr += (char)Record[2+i]; 1007 for (unsigned i = 0; i != ConstStrSize; ++i) 1008 ConstrStr += (char)Record[3+AsmStrSize+i]; 1009 const PointerType *PTy = cast<PointerType>(CurTy); 1010 V = InlineAsm::get(cast<FunctionType>(PTy->getElementType()), 1011 AsmStr, ConstrStr, HasSideEffects); 1012 break; 1013 } 1014 case bitc::CST_CODE_MDSTRING: { 1015 unsigned MDStringLength = Record.size(); 1016 SmallString<8> String; 1017 String.resize(MDStringLength); 1018 for (unsigned i = 0; i != MDStringLength; ++i) 1019 String[i] = Record[i]; 1020 V = Context.getMDString(String.c_str(), String.c_str() + MDStringLength); 1021 break; 1022 } 1023 case bitc::CST_CODE_MDNODE: { 1024 if (Record.empty() || Record.size() % 2 == 1) 1025 return Error("Invalid CST_MDNODE record"); 1026 1027 unsigned Size = Record.size(); 1028 SmallVector<Value*, 8> Elts; 1029 for (unsigned i = 0; i != Size; i += 2) { 1030 const Type *Ty = getTypeByID(Record[i], false); 1031 if (Ty != Type::VoidTy) 1032 Elts.push_back(ValueList.getValueFwdRef(Record[i+1], Ty)); 1033 else 1034 Elts.push_back(NULL); 1035 } 1036 V = Context.getMDNode(&Elts[0], Elts.size()); 1037 break; 1038 } 1039 } 1040 1041 ValueList.AssignValue(V, NextCstNo); 1042 ++NextCstNo; 1043 } 1044 1045 if (NextCstNo != ValueList.size()) 1046 return Error("Invalid constant reference!"); 1047 1048 if (Stream.ReadBlockEnd()) 1049 return Error("Error at end of constants block"); 1050 1051 // Once all the constants have been read, go through and resolve forward 1052 // references. 1053 ValueList.ResolveConstantForwardRefs(); 1054 return false; 1055} 1056 1057/// RememberAndSkipFunctionBody - When we see the block for a function body, 1058/// remember where it is and then skip it. This lets us lazily deserialize the 1059/// functions. 1060bool BitcodeReader::RememberAndSkipFunctionBody() { 1061 // Get the function we are talking about. 1062 if (FunctionsWithBodies.empty()) 1063 return Error("Insufficient function protos"); 1064 1065 Function *Fn = FunctionsWithBodies.back(); 1066 FunctionsWithBodies.pop_back(); 1067 1068 // Save the current stream state. 1069 uint64_t CurBit = Stream.GetCurrentBitNo(); 1070 DeferredFunctionInfo[Fn] = std::make_pair(CurBit, Fn->getLinkage()); 1071 1072 // Set the functions linkage to GhostLinkage so we know it is lazily 1073 // deserialized. 1074 Fn->setLinkage(GlobalValue::GhostLinkage); 1075 1076 // Skip over the function block for now. 1077 if (Stream.SkipBlock()) 1078 return Error("Malformed block record"); 1079 return false; 1080} 1081 1082bool BitcodeReader::ParseModule(const std::string &ModuleID) { 1083 // Reject multiple MODULE_BLOCK's in a single bitstream. 1084 if (TheModule) 1085 return Error("Multiple MODULE_BLOCKs in same stream"); 1086 1087 if (Stream.EnterSubBlock(bitc::MODULE_BLOCK_ID)) 1088 return Error("Malformed block record"); 1089 1090 // Otherwise, create the module. 1091 TheModule = new Module(ModuleID, Context); 1092 1093 SmallVector<uint64_t, 64> Record; 1094 std::vector<std::string> SectionTable; 1095 std::vector<std::string> GCTable; 1096 1097 // Read all the records for this module. 1098 while (!Stream.AtEndOfStream()) { 1099 unsigned Code = Stream.ReadCode(); 1100 if (Code == bitc::END_BLOCK) { 1101 if (Stream.ReadBlockEnd()) 1102 return Error("Error at end of module block"); 1103 1104 // Patch the initializers for globals and aliases up. 1105 ResolveGlobalAndAliasInits(); 1106 if (!GlobalInits.empty() || !AliasInits.empty()) 1107 return Error("Malformed global initializer set"); 1108 if (!FunctionsWithBodies.empty()) 1109 return Error("Too few function bodies found"); 1110 1111 // Look for intrinsic functions which need to be upgraded at some point 1112 for (Module::iterator FI = TheModule->begin(), FE = TheModule->end(); 1113 FI != FE; ++FI) { 1114 Function* NewFn; 1115 if (UpgradeIntrinsicFunction(FI, NewFn)) 1116 UpgradedIntrinsics.push_back(std::make_pair(FI, NewFn)); 1117 } 1118 1119 // Force deallocation of memory for these vectors to favor the client that 1120 // want lazy deserialization. 1121 std::vector<std::pair<GlobalVariable*, unsigned> >().swap(GlobalInits); 1122 std::vector<std::pair<GlobalAlias*, unsigned> >().swap(AliasInits); 1123 std::vector<Function*>().swap(FunctionsWithBodies); 1124 return false; 1125 } 1126 1127 if (Code == bitc::ENTER_SUBBLOCK) { 1128 switch (Stream.ReadSubBlockID()) { 1129 default: // Skip unknown content. 1130 if (Stream.SkipBlock()) 1131 return Error("Malformed block record"); 1132 break; 1133 case bitc::BLOCKINFO_BLOCK_ID: 1134 if (Stream.ReadBlockInfoBlock()) 1135 return Error("Malformed BlockInfoBlock"); 1136 break; 1137 case bitc::PARAMATTR_BLOCK_ID: 1138 if (ParseAttributeBlock()) 1139 return true; 1140 break; 1141 case bitc::TYPE_BLOCK_ID: 1142 if (ParseTypeTable()) 1143 return true; 1144 break; 1145 case bitc::TYPE_SYMTAB_BLOCK_ID: 1146 if (ParseTypeSymbolTable()) 1147 return true; 1148 break; 1149 case bitc::VALUE_SYMTAB_BLOCK_ID: 1150 if (ParseValueSymbolTable()) 1151 return true; 1152 break; 1153 case bitc::CONSTANTS_BLOCK_ID: 1154 if (ParseConstants() || ResolveGlobalAndAliasInits()) 1155 return true; 1156 break; 1157 case bitc::FUNCTION_BLOCK_ID: 1158 // If this is the first function body we've seen, reverse the 1159 // FunctionsWithBodies list. 1160 if (!HasReversedFunctionsWithBodies) { 1161 std::reverse(FunctionsWithBodies.begin(), FunctionsWithBodies.end()); 1162 HasReversedFunctionsWithBodies = true; 1163 } 1164 1165 if (RememberAndSkipFunctionBody()) 1166 return true; 1167 break; 1168 } 1169 continue; 1170 } 1171 1172 if (Code == bitc::DEFINE_ABBREV) { 1173 Stream.ReadAbbrevRecord(); 1174 continue; 1175 } 1176 1177 // Read a record. 1178 switch (Stream.ReadRecord(Code, Record)) { 1179 default: break; // Default behavior, ignore unknown content. 1180 case bitc::MODULE_CODE_VERSION: // VERSION: [version#] 1181 if (Record.size() < 1) 1182 return Error("Malformed MODULE_CODE_VERSION"); 1183 // Only version #0 is supported so far. 1184 if (Record[0] != 0) 1185 return Error("Unknown bitstream version!"); 1186 break; 1187 case bitc::MODULE_CODE_TRIPLE: { // TRIPLE: [strchr x N] 1188 std::string S; 1189 if (ConvertToString(Record, 0, S)) 1190 return Error("Invalid MODULE_CODE_TRIPLE record"); 1191 TheModule->setTargetTriple(S); 1192 break; 1193 } 1194 case bitc::MODULE_CODE_DATALAYOUT: { // DATALAYOUT: [strchr x N] 1195 std::string S; 1196 if (ConvertToString(Record, 0, S)) 1197 return Error("Invalid MODULE_CODE_DATALAYOUT record"); 1198 TheModule->setDataLayout(S); 1199 break; 1200 } 1201 case bitc::MODULE_CODE_ASM: { // ASM: [strchr x N] 1202 std::string S; 1203 if (ConvertToString(Record, 0, S)) 1204 return Error("Invalid MODULE_CODE_ASM record"); 1205 TheModule->setModuleInlineAsm(S); 1206 break; 1207 } 1208 case bitc::MODULE_CODE_DEPLIB: { // DEPLIB: [strchr x N] 1209 std::string S; 1210 if (ConvertToString(Record, 0, S)) 1211 return Error("Invalid MODULE_CODE_DEPLIB record"); 1212 TheModule->addLibrary(S); 1213 break; 1214 } 1215 case bitc::MODULE_CODE_SECTIONNAME: { // SECTIONNAME: [strchr x N] 1216 std::string S; 1217 if (ConvertToString(Record, 0, S)) 1218 return Error("Invalid MODULE_CODE_SECTIONNAME record"); 1219 SectionTable.push_back(S); 1220 break; 1221 } 1222 case bitc::MODULE_CODE_GCNAME: { // SECTIONNAME: [strchr x N] 1223 std::string S; 1224 if (ConvertToString(Record, 0, S)) 1225 return Error("Invalid MODULE_CODE_GCNAME record"); 1226 GCTable.push_back(S); 1227 break; 1228 } 1229 // GLOBALVAR: [pointer type, isconst, initid, 1230 // linkage, alignment, section, visibility, threadlocal] 1231 case bitc::MODULE_CODE_GLOBALVAR: { 1232 if (Record.size() < 6) 1233 return Error("Invalid MODULE_CODE_GLOBALVAR record"); 1234 const Type *Ty = getTypeByID(Record[0]); 1235 if (!isa<PointerType>(Ty)) 1236 return Error("Global not a pointer type!"); 1237 unsigned AddressSpace = cast<PointerType>(Ty)->getAddressSpace(); 1238 Ty = cast<PointerType>(Ty)->getElementType(); 1239 1240 bool isConstant = Record[1]; 1241 GlobalValue::LinkageTypes Linkage = GetDecodedLinkage(Record[3]); 1242 unsigned Alignment = (1 << Record[4]) >> 1; 1243 std::string Section; 1244 if (Record[5]) { 1245 if (Record[5]-1 >= SectionTable.size()) 1246 return Error("Invalid section ID"); 1247 Section = SectionTable[Record[5]-1]; 1248 } 1249 GlobalValue::VisibilityTypes Visibility = GlobalValue::DefaultVisibility; 1250 if (Record.size() > 6) 1251 Visibility = GetDecodedVisibility(Record[6]); 1252 bool isThreadLocal = false; 1253 if (Record.size() > 7) 1254 isThreadLocal = Record[7]; 1255 1256 GlobalVariable *NewGV = 1257 new GlobalVariable(*TheModule, Ty, isConstant, Linkage, 0, "", 0, 1258 isThreadLocal, AddressSpace); 1259 NewGV->setAlignment(Alignment); 1260 if (!Section.empty()) 1261 NewGV->setSection(Section); 1262 NewGV->setVisibility(Visibility); 1263 NewGV->setThreadLocal(isThreadLocal); 1264 1265 ValueList.push_back(NewGV); 1266 1267 // Remember which value to use for the global initializer. 1268 if (unsigned InitID = Record[2]) 1269 GlobalInits.push_back(std::make_pair(NewGV, InitID-1)); 1270 break; 1271 } 1272 // FUNCTION: [type, callingconv, isproto, linkage, paramattr, 1273 // alignment, section, visibility, gc] 1274 case bitc::MODULE_CODE_FUNCTION: { 1275 if (Record.size() < 8) 1276 return Error("Invalid MODULE_CODE_FUNCTION record"); 1277 const Type *Ty = getTypeByID(Record[0]); 1278 if (!isa<PointerType>(Ty)) 1279 return Error("Function not a pointer type!"); 1280 const FunctionType *FTy = 1281 dyn_cast<FunctionType>(cast<PointerType>(Ty)->getElementType()); 1282 if (!FTy) 1283 return Error("Function not a pointer to function type!"); 1284 1285 Function *Func = Function::Create(FTy, GlobalValue::ExternalLinkage, 1286 "", TheModule); 1287 1288 Func->setCallingConv(Record[1]); 1289 bool isProto = Record[2]; 1290 Func->setLinkage(GetDecodedLinkage(Record[3])); 1291 Func->setAttributes(getAttributes(Record[4])); 1292 1293 Func->setAlignment((1 << Record[5]) >> 1); 1294 if (Record[6]) { 1295 if (Record[6]-1 >= SectionTable.size()) 1296 return Error("Invalid section ID"); 1297 Func->setSection(SectionTable[Record[6]-1]); 1298 } 1299 Func->setVisibility(GetDecodedVisibility(Record[7])); 1300 if (Record.size() > 8 && Record[8]) { 1301 if (Record[8]-1 > GCTable.size()) 1302 return Error("Invalid GC ID"); 1303 Func->setGC(GCTable[Record[8]-1].c_str()); 1304 } 1305 ValueList.push_back(Func); 1306 1307 // If this is a function with a body, remember the prototype we are 1308 // creating now, so that we can match up the body with them later. 1309 if (!isProto) 1310 FunctionsWithBodies.push_back(Func); 1311 break; 1312 } 1313 // ALIAS: [alias type, aliasee val#, linkage] 1314 // ALIAS: [alias type, aliasee val#, linkage, visibility] 1315 case bitc::MODULE_CODE_ALIAS: { 1316 if (Record.size() < 3) 1317 return Error("Invalid MODULE_ALIAS record"); 1318 const Type *Ty = getTypeByID(Record[0]); 1319 if (!isa<PointerType>(Ty)) 1320 return Error("Function not a pointer type!"); 1321 1322 GlobalAlias *NewGA = new GlobalAlias(Ty, GetDecodedLinkage(Record[2]), 1323 "", 0, TheModule); 1324 // Old bitcode files didn't have visibility field. 1325 if (Record.size() > 3) 1326 NewGA->setVisibility(GetDecodedVisibility(Record[3])); 1327 ValueList.push_back(NewGA); 1328 AliasInits.push_back(std::make_pair(NewGA, Record[1])); 1329 break; 1330 } 1331 /// MODULE_CODE_PURGEVALS: [numvals] 1332 case bitc::MODULE_CODE_PURGEVALS: 1333 // Trim down the value list to the specified size. 1334 if (Record.size() < 1 || Record[0] > ValueList.size()) 1335 return Error("Invalid MODULE_PURGEVALS record"); 1336 ValueList.shrinkTo(Record[0]); 1337 break; 1338 } 1339 Record.clear(); 1340 } 1341 1342 return Error("Premature end of bitstream"); 1343} 1344 1345bool BitcodeReader::ParseBitcode() { 1346 TheModule = 0; 1347 1348 if (Buffer->getBufferSize() & 3) 1349 return Error("Bitcode stream should be a multiple of 4 bytes in length"); 1350 1351 unsigned char *BufPtr = (unsigned char *)Buffer->getBufferStart(); 1352 unsigned char *BufEnd = BufPtr+Buffer->getBufferSize(); 1353 1354 // If we have a wrapper header, parse it and ignore the non-bc file contents. 1355 // The magic number is 0x0B17C0DE stored in little endian. 1356 if (isBitcodeWrapper(BufPtr, BufEnd)) 1357 if (SkipBitcodeWrapperHeader(BufPtr, BufEnd)) 1358 return Error("Invalid bitcode wrapper header"); 1359 1360 StreamFile.init(BufPtr, BufEnd); 1361 Stream.init(StreamFile); 1362 1363 // Sniff for the signature. 1364 if (Stream.Read(8) != 'B' || 1365 Stream.Read(8) != 'C' || 1366 Stream.Read(4) != 0x0 || 1367 Stream.Read(4) != 0xC || 1368 Stream.Read(4) != 0xE || 1369 Stream.Read(4) != 0xD) 1370 return Error("Invalid bitcode signature"); 1371 1372 // We expect a number of well-defined blocks, though we don't necessarily 1373 // need to understand them all. 1374 while (!Stream.AtEndOfStream()) { 1375 unsigned Code = Stream.ReadCode(); 1376 1377 if (Code != bitc::ENTER_SUBBLOCK) 1378 return Error("Invalid record at top-level"); 1379 1380 unsigned BlockID = Stream.ReadSubBlockID(); 1381 1382 // We only know the MODULE subblock ID. 1383 switch (BlockID) { 1384 case bitc::BLOCKINFO_BLOCK_ID: 1385 if (Stream.ReadBlockInfoBlock()) 1386 return Error("Malformed BlockInfoBlock"); 1387 break; 1388 case bitc::MODULE_BLOCK_ID: 1389 if (ParseModule(Buffer->getBufferIdentifier())) 1390 return true; 1391 break; 1392 default: 1393 if (Stream.SkipBlock()) 1394 return Error("Malformed block record"); 1395 break; 1396 } 1397 } 1398 1399 return false; 1400} 1401 1402 1403/// ParseFunctionBody - Lazily parse the specified function body block. 1404bool BitcodeReader::ParseFunctionBody(Function *F) { 1405 if (Stream.EnterSubBlock(bitc::FUNCTION_BLOCK_ID)) 1406 return Error("Malformed block record"); 1407 1408 unsigned ModuleValueListSize = ValueList.size(); 1409 1410 // Add all the function arguments to the value table. 1411 for(Function::arg_iterator I = F->arg_begin(), E = F->arg_end(); I != E; ++I) 1412 ValueList.push_back(I); 1413 1414 unsigned NextValueNo = ValueList.size(); 1415 BasicBlock *CurBB = 0; 1416 unsigned CurBBNo = 0; 1417 1418 // Read all the records. 1419 SmallVector<uint64_t, 64> Record; 1420 while (1) { 1421 unsigned Code = Stream.ReadCode(); 1422 if (Code == bitc::END_BLOCK) { 1423 if (Stream.ReadBlockEnd()) 1424 return Error("Error at end of function block"); 1425 break; 1426 } 1427 1428 if (Code == bitc::ENTER_SUBBLOCK) { 1429 switch (Stream.ReadSubBlockID()) { 1430 default: // Skip unknown content. 1431 if (Stream.SkipBlock()) 1432 return Error("Malformed block record"); 1433 break; 1434 case bitc::CONSTANTS_BLOCK_ID: 1435 if (ParseConstants()) return true; 1436 NextValueNo = ValueList.size(); 1437 break; 1438 case bitc::VALUE_SYMTAB_BLOCK_ID: 1439 if (ParseValueSymbolTable()) return true; 1440 break; 1441 } 1442 continue; 1443 } 1444 1445 if (Code == bitc::DEFINE_ABBREV) { 1446 Stream.ReadAbbrevRecord(); 1447 continue; 1448 } 1449 1450 // Read a record. 1451 Record.clear(); 1452 Instruction *I = 0; 1453 switch (Stream.ReadRecord(Code, Record)) { 1454 default: // Default behavior: reject 1455 return Error("Unknown instruction"); 1456 case bitc::FUNC_CODE_DECLAREBLOCKS: // DECLAREBLOCKS: [nblocks] 1457 if (Record.size() < 1 || Record[0] == 0) 1458 return Error("Invalid DECLAREBLOCKS record"); 1459 // Create all the basic blocks for the function. 1460 FunctionBBs.resize(Record[0]); 1461 for (unsigned i = 0, e = FunctionBBs.size(); i != e; ++i) 1462 FunctionBBs[i] = BasicBlock::Create("", F); 1463 CurBB = FunctionBBs[0]; 1464 continue; 1465 1466 case bitc::FUNC_CODE_INST_BINOP: { // BINOP: [opval, ty, opval, opcode] 1467 unsigned OpNum = 0; 1468 Value *LHS, *RHS; 1469 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) || 1470 getValue(Record, OpNum, LHS->getType(), RHS) || 1471 OpNum+1 != Record.size()) 1472 return Error("Invalid BINOP record"); 1473 1474 int Opc = GetDecodedBinaryOpcode(Record[OpNum], LHS->getType()); 1475 if (Opc == -1) return Error("Invalid BINOP record"); 1476 I = BinaryOperator::Create((Instruction::BinaryOps)Opc, LHS, RHS); 1477 break; 1478 } 1479 case bitc::FUNC_CODE_INST_CAST: { // CAST: [opval, opty, destty, castopc] 1480 unsigned OpNum = 0; 1481 Value *Op; 1482 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1483 OpNum+2 != Record.size()) 1484 return Error("Invalid CAST record"); 1485 1486 const Type *ResTy = getTypeByID(Record[OpNum]); 1487 int Opc = GetDecodedCastOpcode(Record[OpNum+1]); 1488 if (Opc == -1 || ResTy == 0) 1489 return Error("Invalid CAST record"); 1490 I = CastInst::Create((Instruction::CastOps)Opc, Op, ResTy); 1491 break; 1492 } 1493 case bitc::FUNC_CODE_INST_GEP: { // GEP: [n x operands] 1494 unsigned OpNum = 0; 1495 Value *BasePtr; 1496 if (getValueTypePair(Record, OpNum, NextValueNo, BasePtr)) 1497 return Error("Invalid GEP record"); 1498 1499 SmallVector<Value*, 16> GEPIdx; 1500 while (OpNum != Record.size()) { 1501 Value *Op; 1502 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 1503 return Error("Invalid GEP record"); 1504 GEPIdx.push_back(Op); 1505 } 1506 1507 I = GetElementPtrInst::Create(BasePtr, GEPIdx.begin(), GEPIdx.end()); 1508 break; 1509 } 1510 1511 case bitc::FUNC_CODE_INST_EXTRACTVAL: { 1512 // EXTRACTVAL: [opty, opval, n x indices] 1513 unsigned OpNum = 0; 1514 Value *Agg; 1515 if (getValueTypePair(Record, OpNum, NextValueNo, Agg)) 1516 return Error("Invalid EXTRACTVAL record"); 1517 1518 SmallVector<unsigned, 4> EXTRACTVALIdx; 1519 for (unsigned RecSize = Record.size(); 1520 OpNum != RecSize; ++OpNum) { 1521 uint64_t Index = Record[OpNum]; 1522 if ((unsigned)Index != Index) 1523 return Error("Invalid EXTRACTVAL index"); 1524 EXTRACTVALIdx.push_back((unsigned)Index); 1525 } 1526 1527 I = ExtractValueInst::Create(Agg, 1528 EXTRACTVALIdx.begin(), EXTRACTVALIdx.end()); 1529 break; 1530 } 1531 1532 case bitc::FUNC_CODE_INST_INSERTVAL: { 1533 // INSERTVAL: [opty, opval, opty, opval, n x indices] 1534 unsigned OpNum = 0; 1535 Value *Agg; 1536 if (getValueTypePair(Record, OpNum, NextValueNo, Agg)) 1537 return Error("Invalid INSERTVAL record"); 1538 Value *Val; 1539 if (getValueTypePair(Record, OpNum, NextValueNo, Val)) 1540 return Error("Invalid INSERTVAL record"); 1541 1542 SmallVector<unsigned, 4> INSERTVALIdx; 1543 for (unsigned RecSize = Record.size(); 1544 OpNum != RecSize; ++OpNum) { 1545 uint64_t Index = Record[OpNum]; 1546 if ((unsigned)Index != Index) 1547 return Error("Invalid INSERTVAL index"); 1548 INSERTVALIdx.push_back((unsigned)Index); 1549 } 1550 1551 I = InsertValueInst::Create(Agg, Val, 1552 INSERTVALIdx.begin(), INSERTVALIdx.end()); 1553 break; 1554 } 1555 1556 case bitc::FUNC_CODE_INST_SELECT: { // SELECT: [opval, ty, opval, opval] 1557 // obsolete form of select 1558 // handles select i1 ... in old bitcode 1559 unsigned OpNum = 0; 1560 Value *TrueVal, *FalseVal, *Cond; 1561 if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) || 1562 getValue(Record, OpNum, TrueVal->getType(), FalseVal) || 1563 getValue(Record, OpNum, Type::Int1Ty, Cond)) 1564 return Error("Invalid SELECT record"); 1565 1566 I = SelectInst::Create(Cond, TrueVal, FalseVal); 1567 break; 1568 } 1569 1570 case bitc::FUNC_CODE_INST_VSELECT: {// VSELECT: [ty,opval,opval,predty,pred] 1571 // new form of select 1572 // handles select i1 or select [N x i1] 1573 unsigned OpNum = 0; 1574 Value *TrueVal, *FalseVal, *Cond; 1575 if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) || 1576 getValue(Record, OpNum, TrueVal->getType(), FalseVal) || 1577 getValueTypePair(Record, OpNum, NextValueNo, Cond)) 1578 return Error("Invalid SELECT record"); 1579 1580 // select condition can be either i1 or [N x i1] 1581 if (const VectorType* vector_type = 1582 dyn_cast<const VectorType>(Cond->getType())) { 1583 // expect <n x i1> 1584 if (vector_type->getElementType() != Type::Int1Ty) 1585 return Error("Invalid SELECT condition type"); 1586 } else { 1587 // expect i1 1588 if (Cond->getType() != Type::Int1Ty) 1589 return Error("Invalid SELECT condition type"); 1590 } 1591 1592 I = SelectInst::Create(Cond, TrueVal, FalseVal); 1593 break; 1594 } 1595 1596 case bitc::FUNC_CODE_INST_EXTRACTELT: { // EXTRACTELT: [opty, opval, opval] 1597 unsigned OpNum = 0; 1598 Value *Vec, *Idx; 1599 if (getValueTypePair(Record, OpNum, NextValueNo, Vec) || 1600 getValue(Record, OpNum, Type::Int32Ty, Idx)) 1601 return Error("Invalid EXTRACTELT record"); 1602 I = new ExtractElementInst(Vec, Idx); 1603 break; 1604 } 1605 1606 case bitc::FUNC_CODE_INST_INSERTELT: { // INSERTELT: [ty, opval,opval,opval] 1607 unsigned OpNum = 0; 1608 Value *Vec, *Elt, *Idx; 1609 if (getValueTypePair(Record, OpNum, NextValueNo, Vec) || 1610 getValue(Record, OpNum, 1611 cast<VectorType>(Vec->getType())->getElementType(), Elt) || 1612 getValue(Record, OpNum, Type::Int32Ty, Idx)) 1613 return Error("Invalid INSERTELT record"); 1614 I = InsertElementInst::Create(Vec, Elt, Idx); 1615 break; 1616 } 1617 1618 case bitc::FUNC_CODE_INST_SHUFFLEVEC: {// SHUFFLEVEC: [opval,ty,opval,opval] 1619 unsigned OpNum = 0; 1620 Value *Vec1, *Vec2, *Mask; 1621 if (getValueTypePair(Record, OpNum, NextValueNo, Vec1) || 1622 getValue(Record, OpNum, Vec1->getType(), Vec2)) 1623 return Error("Invalid SHUFFLEVEC record"); 1624 1625 if (getValueTypePair(Record, OpNum, NextValueNo, Mask)) 1626 return Error("Invalid SHUFFLEVEC record"); 1627 I = new ShuffleVectorInst(Vec1, Vec2, Mask); 1628 break; 1629 } 1630 1631 case bitc::FUNC_CODE_INST_CMP: // CMP: [opty, opval, opval, pred] 1632 // Old form of ICmp/FCmp returning bool 1633 // Existed to differentiate between icmp/fcmp and vicmp/vfcmp which were 1634 // both legal on vectors but had different behaviour. 1635 case bitc::FUNC_CODE_INST_CMP2: { // CMP2: [opty, opval, opval, pred] 1636 // FCmp/ICmp returning bool or vector of bool 1637 1638 unsigned OpNum = 0; 1639 Value *LHS, *RHS; 1640 if (getValueTypePair(Record, OpNum, NextValueNo, LHS) || 1641 getValue(Record, OpNum, LHS->getType(), RHS) || 1642 OpNum+1 != Record.size()) 1643 return Error("Invalid CMP record"); 1644 1645 if (LHS->getType()->isFPOrFPVector()) 1646 I = new FCmpInst((FCmpInst::Predicate)Record[OpNum], LHS, RHS); 1647 else 1648 I = new ICmpInst((ICmpInst::Predicate)Record[OpNum], LHS, RHS); 1649 break; 1650 } 1651 1652 case bitc::FUNC_CODE_INST_GETRESULT: { // GETRESULT: [ty, val, n] 1653 if (Record.size() != 2) 1654 return Error("Invalid GETRESULT record"); 1655 unsigned OpNum = 0; 1656 Value *Op; 1657 getValueTypePair(Record, OpNum, NextValueNo, Op); 1658 unsigned Index = Record[1]; 1659 I = ExtractValueInst::Create(Op, Index); 1660 break; 1661 } 1662 1663 case bitc::FUNC_CODE_INST_RET: // RET: [opty,opval<optional>] 1664 { 1665 unsigned Size = Record.size(); 1666 if (Size == 0) { 1667 I = ReturnInst::Create(); 1668 break; 1669 } 1670 1671 unsigned OpNum = 0; 1672 SmallVector<Value *,4> Vs; 1673 do { 1674 Value *Op = NULL; 1675 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 1676 return Error("Invalid RET record"); 1677 Vs.push_back(Op); 1678 } while(OpNum != Record.size()); 1679 1680 const Type *ReturnType = F->getReturnType(); 1681 if (Vs.size() > 1 || 1682 (isa<StructType>(ReturnType) && 1683 (Vs.empty() || Vs[0]->getType() != ReturnType))) { 1684 Value *RV = Context.getUndef(ReturnType); 1685 for (unsigned i = 0, e = Vs.size(); i != e; ++i) { 1686 I = InsertValueInst::Create(RV, Vs[i], i, "mrv"); 1687 CurBB->getInstList().push_back(I); 1688 ValueList.AssignValue(I, NextValueNo++); 1689 RV = I; 1690 } 1691 I = ReturnInst::Create(RV); 1692 break; 1693 } 1694 1695 I = ReturnInst::Create(Vs[0]); 1696 break; 1697 } 1698 case bitc::FUNC_CODE_INST_BR: { // BR: [bb#, bb#, opval] or [bb#] 1699 if (Record.size() != 1 && Record.size() != 3) 1700 return Error("Invalid BR record"); 1701 BasicBlock *TrueDest = getBasicBlock(Record[0]); 1702 if (TrueDest == 0) 1703 return Error("Invalid BR record"); 1704 1705 if (Record.size() == 1) 1706 I = BranchInst::Create(TrueDest); 1707 else { 1708 BasicBlock *FalseDest = getBasicBlock(Record[1]); 1709 Value *Cond = getFnValueByID(Record[2], Type::Int1Ty); 1710 if (FalseDest == 0 || Cond == 0) 1711 return Error("Invalid BR record"); 1712 I = BranchInst::Create(TrueDest, FalseDest, Cond); 1713 } 1714 break; 1715 } 1716 case bitc::FUNC_CODE_INST_SWITCH: { // SWITCH: [opty, opval, n, n x ops] 1717 if (Record.size() < 3 || (Record.size() & 1) == 0) 1718 return Error("Invalid SWITCH record"); 1719 const Type *OpTy = getTypeByID(Record[0]); 1720 Value *Cond = getFnValueByID(Record[1], OpTy); 1721 BasicBlock *Default = getBasicBlock(Record[2]); 1722 if (OpTy == 0 || Cond == 0 || Default == 0) 1723 return Error("Invalid SWITCH record"); 1724 unsigned NumCases = (Record.size()-3)/2; 1725 SwitchInst *SI = SwitchInst::Create(Cond, Default, NumCases); 1726 for (unsigned i = 0, e = NumCases; i != e; ++i) { 1727 ConstantInt *CaseVal = 1728 dyn_cast_or_null<ConstantInt>(getFnValueByID(Record[3+i*2], OpTy)); 1729 BasicBlock *DestBB = getBasicBlock(Record[1+3+i*2]); 1730 if (CaseVal == 0 || DestBB == 0) { 1731 delete SI; 1732 return Error("Invalid SWITCH record!"); 1733 } 1734 SI->addCase(CaseVal, DestBB); 1735 } 1736 I = SI; 1737 break; 1738 } 1739 1740 case bitc::FUNC_CODE_INST_INVOKE: { 1741 // INVOKE: [attrs, cc, normBB, unwindBB, fnty, op0,op1,op2, ...] 1742 if (Record.size() < 4) return Error("Invalid INVOKE record"); 1743 AttrListPtr PAL = getAttributes(Record[0]); 1744 unsigned CCInfo = Record[1]; 1745 BasicBlock *NormalBB = getBasicBlock(Record[2]); 1746 BasicBlock *UnwindBB = getBasicBlock(Record[3]); 1747 1748 unsigned OpNum = 4; 1749 Value *Callee; 1750 if (getValueTypePair(Record, OpNum, NextValueNo, Callee)) 1751 return Error("Invalid INVOKE record"); 1752 1753 const PointerType *CalleeTy = dyn_cast<PointerType>(Callee->getType()); 1754 const FunctionType *FTy = !CalleeTy ? 0 : 1755 dyn_cast<FunctionType>(CalleeTy->getElementType()); 1756 1757 // Check that the right number of fixed parameters are here. 1758 if (FTy == 0 || NormalBB == 0 || UnwindBB == 0 || 1759 Record.size() < OpNum+FTy->getNumParams()) 1760 return Error("Invalid INVOKE record"); 1761 1762 SmallVector<Value*, 16> Ops; 1763 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) { 1764 Ops.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i))); 1765 if (Ops.back() == 0) return Error("Invalid INVOKE record"); 1766 } 1767 1768 if (!FTy->isVarArg()) { 1769 if (Record.size() != OpNum) 1770 return Error("Invalid INVOKE record"); 1771 } else { 1772 // Read type/value pairs for varargs params. 1773 while (OpNum != Record.size()) { 1774 Value *Op; 1775 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 1776 return Error("Invalid INVOKE record"); 1777 Ops.push_back(Op); 1778 } 1779 } 1780 1781 I = InvokeInst::Create(Callee, NormalBB, UnwindBB, 1782 Ops.begin(), Ops.end()); 1783 cast<InvokeInst>(I)->setCallingConv(CCInfo); 1784 cast<InvokeInst>(I)->setAttributes(PAL); 1785 break; 1786 } 1787 case bitc::FUNC_CODE_INST_UNWIND: // UNWIND 1788 I = new UnwindInst(); 1789 break; 1790 case bitc::FUNC_CODE_INST_UNREACHABLE: // UNREACHABLE 1791 I = new UnreachableInst(); 1792 break; 1793 case bitc::FUNC_CODE_INST_PHI: { // PHI: [ty, val0,bb0, ...] 1794 if (Record.size() < 1 || ((Record.size()-1)&1)) 1795 return Error("Invalid PHI record"); 1796 const Type *Ty = getTypeByID(Record[0]); 1797 if (!Ty) return Error("Invalid PHI record"); 1798 1799 PHINode *PN = PHINode::Create(Ty); 1800 PN->reserveOperandSpace((Record.size()-1)/2); 1801 1802 for (unsigned i = 0, e = Record.size()-1; i != e; i += 2) { 1803 Value *V = getFnValueByID(Record[1+i], Ty); 1804 BasicBlock *BB = getBasicBlock(Record[2+i]); 1805 if (!V || !BB) return Error("Invalid PHI record"); 1806 PN->addIncoming(V, BB); 1807 } 1808 I = PN; 1809 break; 1810 } 1811 1812 case bitc::FUNC_CODE_INST_MALLOC: { // MALLOC: [instty, op, align] 1813 if (Record.size() < 3) 1814 return Error("Invalid MALLOC record"); 1815 const PointerType *Ty = 1816 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1817 Value *Size = getFnValueByID(Record[1], Type::Int32Ty); 1818 unsigned Align = Record[2]; 1819 if (!Ty || !Size) return Error("Invalid MALLOC record"); 1820 I = new MallocInst(Ty->getElementType(), Size, (1 << Align) >> 1); 1821 break; 1822 } 1823 case bitc::FUNC_CODE_INST_FREE: { // FREE: [op, opty] 1824 unsigned OpNum = 0; 1825 Value *Op; 1826 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1827 OpNum != Record.size()) 1828 return Error("Invalid FREE record"); 1829 I = new FreeInst(Op); 1830 break; 1831 } 1832 case bitc::FUNC_CODE_INST_ALLOCA: { // ALLOCA: [instty, op, align] 1833 if (Record.size() < 3) 1834 return Error("Invalid ALLOCA record"); 1835 const PointerType *Ty = 1836 dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); 1837 Value *Size = getFnValueByID(Record[1], Type::Int32Ty); 1838 unsigned Align = Record[2]; 1839 if (!Ty || !Size) return Error("Invalid ALLOCA record"); 1840 I = new AllocaInst(Ty->getElementType(), Size, (1 << Align) >> 1); 1841 break; 1842 } 1843 case bitc::FUNC_CODE_INST_LOAD: { // LOAD: [opty, op, align, vol] 1844 unsigned OpNum = 0; 1845 Value *Op; 1846 if (getValueTypePair(Record, OpNum, NextValueNo, Op) || 1847 OpNum+2 != Record.size()) 1848 return Error("Invalid LOAD record"); 1849 1850 I = new LoadInst(Op, "", Record[OpNum+1], (1 << Record[OpNum]) >> 1); 1851 break; 1852 } 1853 case bitc::FUNC_CODE_INST_STORE2: { // STORE2:[ptrty, ptr, val, align, vol] 1854 unsigned OpNum = 0; 1855 Value *Val, *Ptr; 1856 if (getValueTypePair(Record, OpNum, NextValueNo, Ptr) || 1857 getValue(Record, OpNum, 1858 cast<PointerType>(Ptr->getType())->getElementType(), Val) || 1859 OpNum+2 != Record.size()) 1860 return Error("Invalid STORE record"); 1861 1862 I = new StoreInst(Val, Ptr, Record[OpNum+1], (1 << Record[OpNum]) >> 1); 1863 break; 1864 } 1865 case bitc::FUNC_CODE_INST_STORE: { // STORE:[val, valty, ptr, align, vol] 1866 // FIXME: Legacy form of store instruction. Should be removed in LLVM 3.0. 1867 unsigned OpNum = 0; 1868 Value *Val, *Ptr; 1869 if (getValueTypePair(Record, OpNum, NextValueNo, Val) || 1870 getValue(Record, OpNum, 1871 Context.getPointerTypeUnqual(Val->getType()), Ptr)|| 1872 OpNum+2 != Record.size()) 1873 return Error("Invalid STORE record"); 1874 1875 I = new StoreInst(Val, Ptr, Record[OpNum+1], (1 << Record[OpNum]) >> 1); 1876 break; 1877 } 1878 case bitc::FUNC_CODE_INST_CALL: { 1879 // CALL: [paramattrs, cc, fnty, fnid, arg0, arg1...] 1880 if (Record.size() < 3) 1881 return Error("Invalid CALL record"); 1882 1883 AttrListPtr PAL = getAttributes(Record[0]); 1884 unsigned CCInfo = Record[1]; 1885 1886 unsigned OpNum = 2; 1887 Value *Callee; 1888 if (getValueTypePair(Record, OpNum, NextValueNo, Callee)) 1889 return Error("Invalid CALL record"); 1890 1891 const PointerType *OpTy = dyn_cast<PointerType>(Callee->getType()); 1892 const FunctionType *FTy = 0; 1893 if (OpTy) FTy = dyn_cast<FunctionType>(OpTy->getElementType()); 1894 if (!FTy || Record.size() < FTy->getNumParams()+OpNum) 1895 return Error("Invalid CALL record"); 1896 1897 SmallVector<Value*, 16> Args; 1898 // Read the fixed params. 1899 for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) { 1900 if (FTy->getParamType(i)->getTypeID()==Type::LabelTyID) 1901 Args.push_back(getBasicBlock(Record[OpNum])); 1902 else 1903 Args.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i))); 1904 if (Args.back() == 0) return Error("Invalid CALL record"); 1905 } 1906 1907 // Read type/value pairs for varargs params. 1908 if (!FTy->isVarArg()) { 1909 if (OpNum != Record.size()) 1910 return Error("Invalid CALL record"); 1911 } else { 1912 while (OpNum != Record.size()) { 1913 Value *Op; 1914 if (getValueTypePair(Record, OpNum, NextValueNo, Op)) 1915 return Error("Invalid CALL record"); 1916 Args.push_back(Op); 1917 } 1918 } 1919 1920 I = CallInst::Create(Callee, Args.begin(), Args.end()); 1921 cast<CallInst>(I)->setCallingConv(CCInfo>>1); 1922 cast<CallInst>(I)->setTailCall(CCInfo & 1); 1923 cast<CallInst>(I)->setAttributes(PAL); 1924 break; 1925 } 1926 case bitc::FUNC_CODE_INST_VAARG: { // VAARG: [valistty, valist, instty] 1927 if (Record.size() < 3) 1928 return Error("Invalid VAARG record"); 1929 const Type *OpTy = getTypeByID(Record[0]); 1930 Value *Op = getFnValueByID(Record[1], OpTy); 1931 const Type *ResTy = getTypeByID(Record[2]); 1932 if (!OpTy || !Op || !ResTy) 1933 return Error("Invalid VAARG record"); 1934 I = new VAArgInst(Op, ResTy); 1935 break; 1936 } 1937 } 1938 1939 // Add instruction to end of current BB. If there is no current BB, reject 1940 // this file. 1941 if (CurBB == 0) { 1942 delete I; 1943 return Error("Invalid instruction with no BB"); 1944 } 1945 CurBB->getInstList().push_back(I); 1946 1947 // If this was a terminator instruction, move to the next block. 1948 if (isa<TerminatorInst>(I)) { 1949 ++CurBBNo; 1950 CurBB = CurBBNo < FunctionBBs.size() ? FunctionBBs[CurBBNo] : 0; 1951 } 1952 1953 // Non-void values get registered in the value table for future use. 1954 if (I && I->getType() != Type::VoidTy) 1955 ValueList.AssignValue(I, NextValueNo++); 1956 } 1957 1958 // Check the function list for unresolved values. 1959 if (Argument *A = dyn_cast<Argument>(ValueList.back())) { 1960 if (A->getParent() == 0) { 1961 // We found at least one unresolved value. Nuke them all to avoid leaks. 1962 for (unsigned i = ModuleValueListSize, e = ValueList.size(); i != e; ++i){ 1963 if ((A = dyn_cast<Argument>(ValueList.back())) && A->getParent() == 0) { 1964 A->replaceAllUsesWith(Context.getUndef(A->getType())); 1965 delete A; 1966 } 1967 } 1968 return Error("Never resolved value found in function!"); 1969 } 1970 } 1971 1972 // Trim the value list down to the size it was before we parsed this function. 1973 ValueList.shrinkTo(ModuleValueListSize); 1974 std::vector<BasicBlock*>().swap(FunctionBBs); 1975 1976 return false; 1977} 1978 1979//===----------------------------------------------------------------------===// 1980// ModuleProvider implementation 1981//===----------------------------------------------------------------------===// 1982 1983 1984bool BitcodeReader::materializeFunction(Function *F, std::string *ErrInfo) { 1985 // If it already is material, ignore the request. 1986 if (!F->hasNotBeenReadFromBitcode()) return false; 1987 1988 DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator DFII = 1989 DeferredFunctionInfo.find(F); 1990 assert(DFII != DeferredFunctionInfo.end() && "Deferred function not found!"); 1991 1992 // Move the bit stream to the saved position of the deferred function body and 1993 // restore the real linkage type for the function. 1994 Stream.JumpToBit(DFII->second.first); 1995 F->setLinkage((GlobalValue::LinkageTypes)DFII->second.second); 1996 1997 if (ParseFunctionBody(F)) { 1998 if (ErrInfo) *ErrInfo = ErrorString; 1999 return true; 2000 } 2001 2002 // Upgrade any old intrinsic calls in the function. 2003 for (UpgradedIntrinsicMap::iterator I = UpgradedIntrinsics.begin(), 2004 E = UpgradedIntrinsics.end(); I != E; ++I) { 2005 if (I->first != I->second) { 2006 for (Value::use_iterator UI = I->first->use_begin(), 2007 UE = I->first->use_end(); UI != UE; ) { 2008 if (CallInst* CI = dyn_cast<CallInst>(*UI++)) 2009 UpgradeIntrinsicCall(CI, I->second); 2010 } 2011 } 2012 } 2013 2014 return false; 2015} 2016 2017void BitcodeReader::dematerializeFunction(Function *F) { 2018 // If this function isn't materialized, or if it is a proto, this is a noop. 2019 if (F->hasNotBeenReadFromBitcode() || F->isDeclaration()) 2020 return; 2021 2022 assert(DeferredFunctionInfo.count(F) && "No info to read function later?"); 2023 2024 // Just forget the function body, we can remat it later. 2025 F->deleteBody(); 2026 F->setLinkage(GlobalValue::GhostLinkage); 2027} 2028 2029 2030Module *BitcodeReader::materializeModule(std::string *ErrInfo) { 2031 // Iterate over the module, deserializing any functions that are still on 2032 // disk. 2033 for (Module::iterator F = TheModule->begin(), E = TheModule->end(); 2034 F != E; ++F) 2035 if (F->hasNotBeenReadFromBitcode() && 2036 materializeFunction(F, ErrInfo)) 2037 return 0; 2038 2039 // Upgrade any intrinsic calls that slipped through (should not happen!) and 2040 // delete the old functions to clean up. We can't do this unless the entire 2041 // module is materialized because there could always be another function body 2042 // with calls to the old function. 2043 for (std::vector<std::pair<Function*, Function*> >::iterator I = 2044 UpgradedIntrinsics.begin(), E = UpgradedIntrinsics.end(); I != E; ++I) { 2045 if (I->first != I->second) { 2046 for (Value::use_iterator UI = I->first->use_begin(), 2047 UE = I->first->use_end(); UI != UE; ) { 2048 if (CallInst* CI = dyn_cast<CallInst>(*UI++)) 2049 UpgradeIntrinsicCall(CI, I->second); 2050 } 2051 if (!I->first->use_empty()) 2052 I->first->replaceAllUsesWith(I->second); 2053 I->first->eraseFromParent(); 2054 } 2055 } 2056 std::vector<std::pair<Function*, Function*> >().swap(UpgradedIntrinsics); 2057 2058 return TheModule; 2059} 2060 2061 2062/// This method is provided by the parent ModuleProvde class and overriden 2063/// here. It simply releases the module from its provided and frees up our 2064/// state. 2065/// @brief Release our hold on the generated module 2066Module *BitcodeReader::releaseModule(std::string *ErrInfo) { 2067 // Since we're losing control of this Module, we must hand it back complete 2068 Module *M = ModuleProvider::releaseModule(ErrInfo); 2069 FreeState(); 2070 return M; 2071} 2072 2073 2074//===----------------------------------------------------------------------===// 2075// External interface 2076//===----------------------------------------------------------------------===// 2077 2078/// getBitcodeModuleProvider - lazy function-at-a-time loading from a file. 2079/// 2080ModuleProvider *llvm::getBitcodeModuleProvider(MemoryBuffer *Buffer, 2081 LLVMContext& Context, 2082 std::string *ErrMsg) { 2083 BitcodeReader *R = new BitcodeReader(Buffer, Context); 2084 if (R->ParseBitcode()) { 2085 if (ErrMsg) 2086 *ErrMsg = R->getErrorString(); 2087 2088 // Don't let the BitcodeReader dtor delete 'Buffer'. 2089 R->releaseMemoryBuffer(); 2090 delete R; 2091 return 0; 2092 } 2093 return R; 2094} 2095 2096/// ParseBitcodeFile - Read the specified bitcode file, returning the module. 2097/// If an error occurs, return null and fill in *ErrMsg if non-null. 2098Module *llvm::ParseBitcodeFile(MemoryBuffer *Buffer, LLVMContext& Context, 2099 std::string *ErrMsg){ 2100 BitcodeReader *R; 2101 R = static_cast<BitcodeReader*>(getBitcodeModuleProvider(Buffer, Context, 2102 ErrMsg)); 2103 if (!R) return 0; 2104 2105 // Read in the entire module. 2106 Module *M = R->materializeModule(ErrMsg); 2107 2108 // Don't let the BitcodeReader dtor delete 'Buffer', regardless of whether 2109 // there was an error. 2110 R->releaseMemoryBuffer(); 2111 2112 // If there was no error, tell ModuleProvider not to delete it when its dtor 2113 // is run. 2114 if (M) 2115 M = R->releaseModule(ErrMsg); 2116 2117 delete R; 2118 return M; 2119} 2120