diff options
Diffstat (limited to 'contrib/llvm/lib/Bitcode/Reader')
| -rw-r--r-- | contrib/llvm/lib/Bitcode/Reader/BitReader.cpp | 88 | ||||
| -rw-r--r-- | contrib/llvm/lib/Bitcode/Reader/BitcodeReader.cpp | 3010 | ||||
| -rw-r--r-- | contrib/llvm/lib/Bitcode/Reader/BitcodeReader.h | 278 |
3 files changed, 3376 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Bitcode/Reader/BitReader.cpp b/contrib/llvm/lib/Bitcode/Reader/BitReader.cpp new file mode 100644 index 0000000..15844c0 --- /dev/null +++ b/contrib/llvm/lib/Bitcode/Reader/BitReader.cpp @@ -0,0 +1,88 @@ +//===-- BitReader.cpp -----------------------------------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#include "llvm-c/BitReader.h" +#include "llvm/Bitcode/ReaderWriter.h" +#include "llvm/LLVMContext.h" +#include "llvm/Support/MemoryBuffer.h" +#include <string> +#include <cstring> + +using namespace llvm; + +/* Builds a module from the bitcode in the specified memory buffer, returning a + reference to the module via the OutModule parameter. Returns 0 on success. + Optionally returns a human-readable error message via OutMessage. */ +LLVMBool LLVMParseBitcode(LLVMMemoryBufferRef MemBuf, + LLVMModuleRef *OutModule, char **OutMessage) { + return LLVMParseBitcodeInContext(wrap(&getGlobalContext()), MemBuf, OutModule, + OutMessage); +} + +LLVMBool LLVMParseBitcodeInContext(LLVMContextRef ContextRef, + LLVMMemoryBufferRef MemBuf, + LLVMModuleRef *OutModule, + char **OutMessage) { + std::string Message; + + *OutModule = wrap(ParseBitcodeFile(unwrap(MemBuf), *unwrap(ContextRef), + &Message)); + if (!*OutModule) { + if (OutMessage) + *OutMessage = strdup(Message.c_str()); + return 1; + } + + return 0; +} + +/* Reads a module from the specified path, returning via the OutModule parameter + a module provider which performs lazy deserialization. Returns 0 on success. + Optionally returns a human-readable error message via OutMessage. */ +LLVMBool LLVMGetBitcodeModuleInContext(LLVMContextRef ContextRef, + LLVMMemoryBufferRef MemBuf, + LLVMModuleRef *OutM, + char **OutMessage) { + std::string Message; + + *OutM = wrap(getLazyBitcodeModule(unwrap(MemBuf), *unwrap(ContextRef), + &Message)); + if (!*OutM) { + if (OutMessage) + *OutMessage = strdup(Message.c_str()); + return 1; + } + + return 0; + +} + +LLVMBool LLVMGetBitcodeModule(LLVMMemoryBufferRef MemBuf, LLVMModuleRef *OutM, + char **OutMessage) { + return LLVMGetBitcodeModuleInContext(LLVMGetGlobalContext(), MemBuf, OutM, + OutMessage); +} + +/* Deprecated: Use LLVMGetBitcodeModuleInContext instead. */ +LLVMBool LLVMGetBitcodeModuleProviderInContext(LLVMContextRef ContextRef, + LLVMMemoryBufferRef MemBuf, + LLVMModuleProviderRef *OutMP, + char **OutMessage) { + return LLVMGetBitcodeModuleInContext(ContextRef, MemBuf, + reinterpret_cast<LLVMModuleRef*>(OutMP), + OutMessage); +} + +/* Deprecated: Use LLVMGetBitcodeModule instead. */ +LLVMBool LLVMGetBitcodeModuleProvider(LLVMMemoryBufferRef MemBuf, + LLVMModuleProviderRef *OutMP, + char **OutMessage) { + return LLVMGetBitcodeModuleProviderInContext(LLVMGetGlobalContext(), MemBuf, + OutMP, OutMessage); +} diff --git a/contrib/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/contrib/llvm/lib/Bitcode/Reader/BitcodeReader.cpp new file mode 100644 index 0000000..46565f3 --- /dev/null +++ b/contrib/llvm/lib/Bitcode/Reader/BitcodeReader.cpp @@ -0,0 +1,3010 @@ +//===- BitcodeReader.cpp - Internal BitcodeReader implementation ----------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This header defines the BitcodeReader class. +// +//===----------------------------------------------------------------------===// + +#include "llvm/Bitcode/ReaderWriter.h" +#include "BitcodeReader.h" +#include "llvm/Constants.h" +#include "llvm/DerivedTypes.h" +#include "llvm/InlineAsm.h" +#include "llvm/IntrinsicInst.h" +#include "llvm/Module.h" +#include "llvm/Operator.h" +#include "llvm/AutoUpgrade.h" +#include "llvm/ADT/SmallString.h" +#include "llvm/ADT/SmallVector.h" +#include "llvm/Support/MathExtras.h" +#include "llvm/Support/MemoryBuffer.h" +#include "llvm/OperandTraits.h" +using namespace llvm; + +void BitcodeReader::FreeState() { + if (BufferOwned) + delete Buffer; + Buffer = 0; + std::vector<Type*>().swap(TypeList); + ValueList.clear(); + MDValueList.clear(); + + std::vector<AttrListPtr>().swap(MAttributes); + std::vector<BasicBlock*>().swap(FunctionBBs); + std::vector<Function*>().swap(FunctionsWithBodies); + DeferredFunctionInfo.clear(); + MDKindMap.clear(); +} + +//===----------------------------------------------------------------------===// +// Helper functions to implement forward reference resolution, etc. +//===----------------------------------------------------------------------===// + +/// ConvertToString - Convert a string from a record into an std::string, return +/// true on failure. +template<typename StrTy> +static bool ConvertToString(SmallVector<uint64_t, 64> &Record, unsigned Idx, + StrTy &Result) { + if (Idx > Record.size()) + return true; + + for (unsigned i = Idx, e = Record.size(); i != e; ++i) + Result += (char)Record[i]; + return false; +} + +static GlobalValue::LinkageTypes GetDecodedLinkage(unsigned Val) { + switch (Val) { + default: // Map unknown/new linkages to external + case 0: return GlobalValue::ExternalLinkage; + case 1: return GlobalValue::WeakAnyLinkage; + case 2: return GlobalValue::AppendingLinkage; + case 3: return GlobalValue::InternalLinkage; + case 4: return GlobalValue::LinkOnceAnyLinkage; + case 5: return GlobalValue::DLLImportLinkage; + case 6: return GlobalValue::DLLExportLinkage; + case 7: return GlobalValue::ExternalWeakLinkage; + case 8: return GlobalValue::CommonLinkage; + case 9: return GlobalValue::PrivateLinkage; + case 10: return GlobalValue::WeakODRLinkage; + case 11: return GlobalValue::LinkOnceODRLinkage; + case 12: return GlobalValue::AvailableExternallyLinkage; + case 13: return GlobalValue::LinkerPrivateLinkage; + case 14: return GlobalValue::LinkerPrivateWeakLinkage; + case 15: return GlobalValue::LinkerPrivateWeakDefAutoLinkage; + } +} + +static GlobalValue::VisibilityTypes GetDecodedVisibility(unsigned Val) { + switch (Val) { + default: // Map unknown visibilities to default. + case 0: return GlobalValue::DefaultVisibility; + case 1: return GlobalValue::HiddenVisibility; + case 2: return GlobalValue::ProtectedVisibility; + } +} + +static int GetDecodedCastOpcode(unsigned Val) { + switch (Val) { + default: return -1; + case bitc::CAST_TRUNC : return Instruction::Trunc; + case bitc::CAST_ZEXT : return Instruction::ZExt; + case bitc::CAST_SEXT : return Instruction::SExt; + case bitc::CAST_FPTOUI : return Instruction::FPToUI; + case bitc::CAST_FPTOSI : return Instruction::FPToSI; + case bitc::CAST_UITOFP : return Instruction::UIToFP; + case bitc::CAST_SITOFP : return Instruction::SIToFP; + case bitc::CAST_FPTRUNC : return Instruction::FPTrunc; + case bitc::CAST_FPEXT : return Instruction::FPExt; + case bitc::CAST_PTRTOINT: return Instruction::PtrToInt; + case bitc::CAST_INTTOPTR: return Instruction::IntToPtr; + case bitc::CAST_BITCAST : return Instruction::BitCast; + } +} +static int GetDecodedBinaryOpcode(unsigned Val, Type *Ty) { + switch (Val) { + default: return -1; + case bitc::BINOP_ADD: + return Ty->isFPOrFPVectorTy() ? Instruction::FAdd : Instruction::Add; + case bitc::BINOP_SUB: + return Ty->isFPOrFPVectorTy() ? Instruction::FSub : Instruction::Sub; + case bitc::BINOP_MUL: + return Ty->isFPOrFPVectorTy() ? Instruction::FMul : Instruction::Mul; + case bitc::BINOP_UDIV: return Instruction::UDiv; + case bitc::BINOP_SDIV: + return Ty->isFPOrFPVectorTy() ? Instruction::FDiv : Instruction::SDiv; + case bitc::BINOP_UREM: return Instruction::URem; + case bitc::BINOP_SREM: + return Ty->isFPOrFPVectorTy() ? Instruction::FRem : Instruction::SRem; + case bitc::BINOP_SHL: return Instruction::Shl; + case bitc::BINOP_LSHR: return Instruction::LShr; + case bitc::BINOP_ASHR: return Instruction::AShr; + case bitc::BINOP_AND: return Instruction::And; + case bitc::BINOP_OR: return Instruction::Or; + case bitc::BINOP_XOR: return Instruction::Xor; + } +} + +static AtomicRMWInst::BinOp GetDecodedRMWOperation(unsigned Val) { + switch (Val) { + default: return AtomicRMWInst::BAD_BINOP; + case bitc::RMW_XCHG: return AtomicRMWInst::Xchg; + case bitc::RMW_ADD: return AtomicRMWInst::Add; + case bitc::RMW_SUB: return AtomicRMWInst::Sub; + case bitc::RMW_AND: return AtomicRMWInst::And; + case bitc::RMW_NAND: return AtomicRMWInst::Nand; + case bitc::RMW_OR: return AtomicRMWInst::Or; + case bitc::RMW_XOR: return AtomicRMWInst::Xor; + case bitc::RMW_MAX: return AtomicRMWInst::Max; + case bitc::RMW_MIN: return AtomicRMWInst::Min; + case bitc::RMW_UMAX: return AtomicRMWInst::UMax; + case bitc::RMW_UMIN: return AtomicRMWInst::UMin; + } +} + +static AtomicOrdering GetDecodedOrdering(unsigned Val) { + switch (Val) { + case bitc::ORDERING_NOTATOMIC: return NotAtomic; + case bitc::ORDERING_UNORDERED: return Unordered; + case bitc::ORDERING_MONOTONIC: return Monotonic; + case bitc::ORDERING_ACQUIRE: return Acquire; + case bitc::ORDERING_RELEASE: return Release; + case bitc::ORDERING_ACQREL: return AcquireRelease; + default: // Map unknown orderings to sequentially-consistent. + case bitc::ORDERING_SEQCST: return SequentiallyConsistent; + } +} + +static SynchronizationScope GetDecodedSynchScope(unsigned Val) { + switch (Val) { + case bitc::SYNCHSCOPE_SINGLETHREAD: return SingleThread; + default: // Map unknown scopes to cross-thread. + case bitc::SYNCHSCOPE_CROSSTHREAD: return CrossThread; + } +} + +namespace llvm { +namespace { + /// @brief A class for maintaining the slot number definition + /// as a placeholder for the actual definition for forward constants defs. + class ConstantPlaceHolder : public ConstantExpr { + void operator=(const ConstantPlaceHolder &); // DO NOT IMPLEMENT + public: + // allocate space for exactly one operand + void *operator new(size_t s) { + return User::operator new(s, 1); + } + explicit ConstantPlaceHolder(Type *Ty, LLVMContext& Context) + : ConstantExpr(Ty, Instruction::UserOp1, &Op<0>(), 1) { + Op<0>() = UndefValue::get(Type::getInt32Ty(Context)); + } + + /// @brief Methods to support type inquiry through isa, cast, and dyn_cast. + //static inline bool classof(const ConstantPlaceHolder *) { return true; } + static bool classof(const Value *V) { + return isa<ConstantExpr>(V) && + cast<ConstantExpr>(V)->getOpcode() == Instruction::UserOp1; + } + + + /// Provide fast operand accessors + //DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value); + }; +} + +// FIXME: can we inherit this from ConstantExpr? +template <> +struct OperandTraits<ConstantPlaceHolder> : + public FixedNumOperandTraits<ConstantPlaceHolder, 1> { +}; +} + + +void BitcodeReaderValueList::AssignValue(Value *V, unsigned Idx) { + if (Idx == size()) { + push_back(V); + return; + } + + if (Idx >= size()) + resize(Idx+1); + + WeakVH &OldV = ValuePtrs[Idx]; + if (OldV == 0) { + OldV = V; + return; + } + + // Handle constants and non-constants (e.g. instrs) differently for + // efficiency. + if (Constant *PHC = dyn_cast<Constant>(&*OldV)) { + ResolveConstants.push_back(std::make_pair(PHC, Idx)); + OldV = V; + } else { + // If there was a forward reference to this value, replace it. + Value *PrevVal = OldV; + OldV->replaceAllUsesWith(V); + delete PrevVal; + } +} + + +Constant *BitcodeReaderValueList::getConstantFwdRef(unsigned Idx, + Type *Ty) { + if (Idx >= size()) + resize(Idx + 1); + + if (Value *V = ValuePtrs[Idx]) { + assert(Ty == V->getType() && "Type mismatch in constant table!"); + return cast<Constant>(V); + } + + // Create and return a placeholder, which will later be RAUW'd. + Constant *C = new ConstantPlaceHolder(Ty, Context); + ValuePtrs[Idx] = C; + return C; +} + +Value *BitcodeReaderValueList::getValueFwdRef(unsigned Idx, Type *Ty) { + if (Idx >= size()) + resize(Idx + 1); + + if (Value *V = ValuePtrs[Idx]) { + assert((Ty == 0 || Ty == V->getType()) && "Type mismatch in value table!"); + return V; + } + + // No type specified, must be invalid reference. + if (Ty == 0) return 0; + + // Create and return a placeholder, which will later be RAUW'd. + Value *V = new Argument(Ty); + ValuePtrs[Idx] = V; + return V; +} + +/// ResolveConstantForwardRefs - Once all constants are read, this method bulk +/// resolves any forward references. The idea behind this is that we sometimes +/// get constants (such as large arrays) which reference *many* forward ref +/// constants. Replacing each of these causes a lot of thrashing when +/// building/reuniquing the constant. Instead of doing this, we look at all the +/// uses and rewrite all the place holders at once for any constant that uses +/// a placeholder. +void BitcodeReaderValueList::ResolveConstantForwardRefs() { + // Sort the values by-pointer so that they are efficient to look up with a + // binary search. + std::sort(ResolveConstants.begin(), ResolveConstants.end()); + + SmallVector<Constant*, 64> NewOps; + + while (!ResolveConstants.empty()) { + Value *RealVal = operator[](ResolveConstants.back().second); + Constant *Placeholder = ResolveConstants.back().first; + ResolveConstants.pop_back(); + + // Loop over all users of the placeholder, updating them to reference the + // new value. If they reference more than one placeholder, update them all + // at once. + while (!Placeholder->use_empty()) { + Value::use_iterator UI = Placeholder->use_begin(); + User *U = *UI; + + // If the using object isn't uniqued, just update the operands. This + // handles instructions and initializers for global variables. + if (!isa<Constant>(U) || isa<GlobalValue>(U)) { + UI.getUse().set(RealVal); + continue; + } + + // Otherwise, we have a constant that uses the placeholder. Replace that + // constant with a new constant that has *all* placeholder uses updated. + Constant *UserC = cast<Constant>(U); + for (User::op_iterator I = UserC->op_begin(), E = UserC->op_end(); + I != E; ++I) { + Value *NewOp; + if (!isa<ConstantPlaceHolder>(*I)) { + // Not a placeholder reference. + NewOp = *I; + } else if (*I == Placeholder) { + // Common case is that it just references this one placeholder. + NewOp = RealVal; + } else { + // Otherwise, look up the placeholder in ResolveConstants. + ResolveConstantsTy::iterator It = + std::lower_bound(ResolveConstants.begin(), ResolveConstants.end(), + std::pair<Constant*, unsigned>(cast<Constant>(*I), + 0)); + assert(It != ResolveConstants.end() && It->first == *I); + NewOp = operator[](It->second); + } + + NewOps.push_back(cast<Constant>(NewOp)); + } + + // Make the new constant. + Constant *NewC; + if (ConstantArray *UserCA = dyn_cast<ConstantArray>(UserC)) { + NewC = ConstantArray::get(UserCA->getType(), NewOps); + } else if (ConstantStruct *UserCS = dyn_cast<ConstantStruct>(UserC)) { + NewC = ConstantStruct::get(UserCS->getType(), NewOps); + } else if (isa<ConstantVector>(UserC)) { + NewC = ConstantVector::get(NewOps); + } else { + assert(isa<ConstantExpr>(UserC) && "Must be a ConstantExpr."); + NewC = cast<ConstantExpr>(UserC)->getWithOperands(NewOps); + } + + UserC->replaceAllUsesWith(NewC); + UserC->destroyConstant(); + NewOps.clear(); + } + + // Update all ValueHandles, they should be the only users at this point. + Placeholder->replaceAllUsesWith(RealVal); + delete Placeholder; + } +} + +void BitcodeReaderMDValueList::AssignValue(Value *V, unsigned Idx) { + if (Idx == size()) { + push_back(V); + return; + } + + if (Idx >= size()) + resize(Idx+1); + + WeakVH &OldV = MDValuePtrs[Idx]; + if (OldV == 0) { + OldV = V; + return; + } + + // If there was a forward reference to this value, replace it. + MDNode *PrevVal = cast<MDNode>(OldV); + OldV->replaceAllUsesWith(V); + MDNode::deleteTemporary(PrevVal); + // Deleting PrevVal sets Idx value in MDValuePtrs to null. Set new + // value for Idx. + MDValuePtrs[Idx] = V; +} + +Value *BitcodeReaderMDValueList::getValueFwdRef(unsigned Idx) { + if (Idx >= size()) + resize(Idx + 1); + + if (Value *V = MDValuePtrs[Idx]) { + assert(V->getType()->isMetadataTy() && "Type mismatch in value table!"); + return V; + } + + // Create and return a placeholder, which will later be RAUW'd. + Value *V = MDNode::getTemporary(Context, ArrayRef<Value*>()); + MDValuePtrs[Idx] = V; + return V; +} + +Type *BitcodeReader::getTypeByID(unsigned ID) { + // The type table size is always specified correctly. + if (ID >= TypeList.size()) + return 0; + + if (Type *Ty = TypeList[ID]) + return Ty; + + // If we have a forward reference, the only possible case is when it is to a + // named struct. Just create a placeholder for now. + return TypeList[ID] = StructType::create(Context); +} + +/// FIXME: Remove in LLVM 3.1, only used by ParseOldTypeTable. +Type *BitcodeReader::getTypeByIDOrNull(unsigned ID) { + if (ID >= TypeList.size()) + TypeList.resize(ID+1); + + return TypeList[ID]; +} + + +//===----------------------------------------------------------------------===// +// Functions for parsing blocks from the bitcode file +//===----------------------------------------------------------------------===// + +bool BitcodeReader::ParseAttributeBlock() { + if (Stream.EnterSubBlock(bitc::PARAMATTR_BLOCK_ID)) + return Error("Malformed block record"); + + if (!MAttributes.empty()) + return Error("Multiple PARAMATTR blocks found!"); + + SmallVector<uint64_t, 64> Record; + + SmallVector<AttributeWithIndex, 8> Attrs; + + // Read all the records. + while (1) { + unsigned Code = Stream.ReadCode(); + if (Code == bitc::END_BLOCK) { + if (Stream.ReadBlockEnd()) + return Error("Error at end of PARAMATTR block"); + return false; + } + + if (Code == bitc::ENTER_SUBBLOCK) { + // No known subblocks, always skip them. + Stream.ReadSubBlockID(); + if (Stream.SkipBlock()) + return Error("Malformed block record"); + continue; + } + + if (Code == bitc::DEFINE_ABBREV) { + Stream.ReadAbbrevRecord(); + continue; + } + + // Read a record. + Record.clear(); + switch (Stream.ReadRecord(Code, Record)) { + default: // Default behavior: ignore. + break; + case bitc::PARAMATTR_CODE_ENTRY: { // ENTRY: [paramidx0, attr0, ...] + if (Record.size() & 1) + return Error("Invalid ENTRY record"); + + // FIXME : Remove this autoupgrade code in LLVM 3.0. + // If Function attributes are using index 0 then transfer them + // to index ~0. Index 0 is used for return value attributes but used to be + // used for function attributes. + Attributes RetAttribute = Attribute::None; + Attributes FnAttribute = Attribute::None; + for (unsigned i = 0, e = Record.size(); i != e; i += 2) { + // FIXME: remove in LLVM 3.0 + // The alignment is stored as a 16-bit raw value from bits 31--16. + // We shift the bits above 31 down by 11 bits. + + unsigned Alignment = (Record[i+1] & (0xffffull << 16)) >> 16; + if (Alignment && !isPowerOf2_32(Alignment)) + return Error("Alignment is not a power of two."); + + Attributes ReconstitutedAttr = Record[i+1] & 0xffff; + if (Alignment) + ReconstitutedAttr |= Attribute::constructAlignmentFromInt(Alignment); + ReconstitutedAttr |= (Record[i+1] & (0xffffull << 32)) >> 11; + Record[i+1] = ReconstitutedAttr; + + if (Record[i] == 0) + RetAttribute = Record[i+1]; + else if (Record[i] == ~0U) + FnAttribute = Record[i+1]; + } + + unsigned OldRetAttrs = (Attribute::NoUnwind|Attribute::NoReturn| + Attribute::ReadOnly|Attribute::ReadNone); + + if (FnAttribute == Attribute::None && RetAttribute != Attribute::None && + (RetAttribute & OldRetAttrs) != 0) { + if (FnAttribute == Attribute::None) { // add a slot so they get added. + Record.push_back(~0U); + Record.push_back(0); + } + + FnAttribute |= RetAttribute & OldRetAttrs; + RetAttribute &= ~OldRetAttrs; + } + + for (unsigned i = 0, e = Record.size(); i != e; i += 2) { + if (Record[i] == 0) { + if (RetAttribute != Attribute::None) + Attrs.push_back(AttributeWithIndex::get(0, RetAttribute)); + } else if (Record[i] == ~0U) { + if (FnAttribute != Attribute::None) + Attrs.push_back(AttributeWithIndex::get(~0U, FnAttribute)); + } else if (Record[i+1] != Attribute::None) + Attrs.push_back(AttributeWithIndex::get(Record[i], Record[i+1])); + } + + MAttributes.push_back(AttrListPtr::get(Attrs.begin(), Attrs.end())); + Attrs.clear(); + break; + } + } + } +} + +bool BitcodeReader::ParseTypeTable() { + if (Stream.EnterSubBlock(bitc::TYPE_BLOCK_ID_NEW)) + return Error("Malformed block record"); + + return ParseTypeTableBody(); +} + +bool BitcodeReader::ParseTypeTableBody() { + if (!TypeList.empty()) + return Error("Multiple TYPE_BLOCKs found!"); + + SmallVector<uint64_t, 64> Record; + unsigned NumRecords = 0; + + SmallString<64> TypeName; + + // Read all the records for this type table. + while (1) { + unsigned Code = Stream.ReadCode(); + if (Code == bitc::END_BLOCK) { + if (NumRecords != TypeList.size()) + return Error("Invalid type forward reference in TYPE_BLOCK"); + if (Stream.ReadBlockEnd()) + return Error("Error at end of type table block"); + return false; + } + + if (Code == bitc::ENTER_SUBBLOCK) { + // No known subblocks, always skip them. + Stream.ReadSubBlockID(); + if (Stream.SkipBlock()) + return Error("Malformed block record"); + continue; + } + + if (Code == bitc::DEFINE_ABBREV) { + Stream.ReadAbbrevRecord(); + continue; + } + + // Read a record. + Record.clear(); + Type *ResultTy = 0; + switch (Stream.ReadRecord(Code, Record)) { + default: return Error("unknown type in type table"); + case bitc::TYPE_CODE_NUMENTRY: // TYPE_CODE_NUMENTRY: [numentries] + // TYPE_CODE_NUMENTRY contains a count of the number of types in the + // type list. This allows us to reserve space. + if (Record.size() < 1) + return Error("Invalid TYPE_CODE_NUMENTRY record"); + TypeList.resize(Record[0]); + continue; + case bitc::TYPE_CODE_VOID: // VOID + ResultTy = Type::getVoidTy(Context); + break; + case bitc::TYPE_CODE_FLOAT: // FLOAT + ResultTy = Type::getFloatTy(Context); + break; + case bitc::TYPE_CODE_DOUBLE: // DOUBLE + ResultTy = Type::getDoubleTy(Context); + break; + case bitc::TYPE_CODE_X86_FP80: // X86_FP80 + ResultTy = Type::getX86_FP80Ty(Context); + break; + case bitc::TYPE_CODE_FP128: // FP128 + ResultTy = Type::getFP128Ty(Context); + break; + case bitc::TYPE_CODE_PPC_FP128: // PPC_FP128 + ResultTy = Type::getPPC_FP128Ty(Context); + break; + case bitc::TYPE_CODE_LABEL: // LABEL + ResultTy = Type::getLabelTy(Context); + break; + case bitc::TYPE_CODE_METADATA: // METADATA + ResultTy = Type::getMetadataTy(Context); + break; + case bitc::TYPE_CODE_X86_MMX: // X86_MMX + ResultTy = Type::getX86_MMXTy(Context); + break; + case bitc::TYPE_CODE_INTEGER: // INTEGER: [width] + if (Record.size() < 1) + return Error("Invalid Integer type record"); + + ResultTy = IntegerType::get(Context, Record[0]); + break; + case bitc::TYPE_CODE_POINTER: { // POINTER: [pointee type] or + // [pointee type, address space] + if (Record.size() < 1) + return Error("Invalid POINTER type record"); + unsigned AddressSpace = 0; + if (Record.size() == 2) + AddressSpace = Record[1]; + ResultTy = getTypeByID(Record[0]); + if (ResultTy == 0) return Error("invalid element type in pointer type"); + ResultTy = PointerType::get(ResultTy, AddressSpace); + break; + } + case bitc::TYPE_CODE_FUNCTION: { + // FIXME: attrid is dead, remove it in LLVM 3.0 + // FUNCTION: [vararg, attrid, retty, paramty x N] + if (Record.size() < 3) + return Error("Invalid FUNCTION type record"); + std::vector<Type*> ArgTys; + for (unsigned i = 3, e = Record.size(); i != e; ++i) { + if (Type *T = getTypeByID(Record[i])) + ArgTys.push_back(T); + else + break; + } + + ResultTy = getTypeByID(Record[2]); + if (ResultTy == 0 || ArgTys.size() < Record.size()-3) + return Error("invalid type in function type"); + + ResultTy = FunctionType::get(ResultTy, ArgTys, Record[0]); + break; + } + case bitc::TYPE_CODE_STRUCT_ANON: { // STRUCT: [ispacked, eltty x N] + if (Record.size() < 1) + return Error("Invalid STRUCT type record"); + std::vector<Type*> EltTys; + for (unsigned i = 1, e = Record.size(); i != e; ++i) { + if (Type *T = getTypeByID(Record[i])) + EltTys.push_back(T); + else + break; + } + if (EltTys.size() != Record.size()-1) + return Error("invalid type in struct type"); + ResultTy = StructType::get(Context, EltTys, Record[0]); + break; + } + case bitc::TYPE_CODE_STRUCT_NAME: // STRUCT_NAME: [strchr x N] + if (ConvertToString(Record, 0, TypeName)) + return Error("Invalid STRUCT_NAME record"); + continue; + + case bitc::TYPE_CODE_STRUCT_NAMED: { // STRUCT: [ispacked, eltty x N] + if (Record.size() < 1) + return Error("Invalid STRUCT type record"); + + if (NumRecords >= TypeList.size()) + return Error("invalid TYPE table"); + + // Check to see if this was forward referenced, if so fill in the temp. + StructType *Res = cast_or_null<StructType>(TypeList[NumRecords]); + if (Res) { + Res->setName(TypeName); + TypeList[NumRecords] = 0; + } else // Otherwise, create a new struct. + Res = StructType::create(Context, TypeName); + TypeName.clear(); + + SmallVector<Type*, 8> EltTys; + for (unsigned i = 1, e = Record.size(); i != e; ++i) { + if (Type *T = getTypeByID(Record[i])) + EltTys.push_back(T); + else + break; + } + if (EltTys.size() != Record.size()-1) + return Error("invalid STRUCT type record"); + Res->setBody(EltTys, Record[0]); + ResultTy = Res; + break; + } + case bitc::TYPE_CODE_OPAQUE: { // OPAQUE: [] + if (Record.size() != 1) + return Error("Invalid OPAQUE type record"); + + if (NumRecords >= TypeList.size()) + return Error("invalid TYPE table"); + + // Check to see if this was forward referenced, if so fill in the temp. + StructType *Res = cast_or_null<StructType>(TypeList[NumRecords]); + if (Res) { + Res->setName(TypeName); + TypeList[NumRecords] = 0; + } else // Otherwise, create a new struct with no body. + Res = StructType::create(Context, TypeName); + TypeName.clear(); + ResultTy = Res; + break; + } + case bitc::TYPE_CODE_ARRAY: // ARRAY: [numelts, eltty] + if (Record.size() < 2) + return Error("Invalid ARRAY type record"); + if ((ResultTy = getTypeByID(Record[1]))) + ResultTy = ArrayType::get(ResultTy, Record[0]); + else + return Error("Invalid ARRAY type element"); + break; + case bitc::TYPE_CODE_VECTOR: // VECTOR: [numelts, eltty] + if (Record.size() < 2) + return Error("Invalid VECTOR type record"); + if ((ResultTy = getTypeByID(Record[1]))) + ResultTy = VectorType::get(ResultTy, Record[0]); + else + return Error("Invalid ARRAY type element"); + break; + } + + if (NumRecords >= TypeList.size()) + return Error("invalid TYPE table"); + assert(ResultTy && "Didn't read a type?"); + assert(TypeList[NumRecords] == 0 && "Already read type?"); + TypeList[NumRecords++] = ResultTy; + } +} + +// FIXME: Remove in LLVM 3.1 +bool BitcodeReader::ParseOldTypeTable() { + if (Stream.EnterSubBlock(bitc::TYPE_BLOCK_ID_OLD)) + return Error("Malformed block record"); + + if (!TypeList.empty()) + return Error("Multiple TYPE_BLOCKs found!"); + + + // While horrible, we have no good ordering of types in the bc file. Just + // iteratively parse types out of the bc file in multiple passes until we get + // them all. Do this by saving a cursor for the start of the type block. + BitstreamCursor StartOfTypeBlockCursor(Stream); + + unsigned NumTypesRead = 0; + + SmallVector<uint64_t, 64> Record; +RestartScan: + unsigned NextTypeID = 0; + bool ReadAnyTypes = false; + + // Read all the records for this type table. + while (1) { + unsigned Code = Stream.ReadCode(); + if (Code == bitc::END_BLOCK) { + if (NextTypeID != TypeList.size()) + return Error("Invalid type forward reference in TYPE_BLOCK_ID_OLD"); + + // If we haven't read all of the types yet, iterate again. + if (NumTypesRead != TypeList.size()) { + // If we didn't successfully read any types in this pass, then we must + // have an unhandled forward reference. + if (!ReadAnyTypes) + return Error("Obsolete bitcode contains unhandled recursive type"); + + Stream = StartOfTypeBlockCursor; + goto RestartScan; + } + + if (Stream.ReadBlockEnd()) + return Error("Error at end of type table block"); + return false; + } + + if (Code == bitc::ENTER_SUBBLOCK) { + // No known subblocks, always skip them. + Stream.ReadSubBlockID(); + if (Stream.SkipBlock()) + return Error("Malformed block record"); + continue; + } + + if (Code == bitc::DEFINE_ABBREV) { + Stream.ReadAbbrevRecord(); + continue; + } + + // Read a record. + Record.clear(); + Type *ResultTy = 0; + switch (Stream.ReadRecord(Code, Record)) { + default: return Error("unknown type in type table"); + case bitc::TYPE_CODE_NUMENTRY: // TYPE_CODE_NUMENTRY: [numentries] + // TYPE_CODE_NUMENTRY contains a count of the number of types in the + // type list. This allows us to reserve space. + if (Record.size() < 1) + return Error("Invalid TYPE_CODE_NUMENTRY record"); + TypeList.resize(Record[0]); + continue; + case bitc::TYPE_CODE_VOID: // VOID + ResultTy = Type::getVoidTy(Context); + break; + case bitc::TYPE_CODE_FLOAT: // FLOAT + ResultTy = Type::getFloatTy(Context); + break; + case bitc::TYPE_CODE_DOUBLE: // DOUBLE + ResultTy = Type::getDoubleTy(Context); + break; + case bitc::TYPE_CODE_X86_FP80: // X86_FP80 + ResultTy = Type::getX86_FP80Ty(Context); + break; + case bitc::TYPE_CODE_FP128: // FP128 + ResultTy = Type::getFP128Ty(Context); + break; + case bitc::TYPE_CODE_PPC_FP128: // PPC_FP128 + ResultTy = Type::getPPC_FP128Ty(Context); + break; + case bitc::TYPE_CODE_LABEL: // LABEL + ResultTy = Type::getLabelTy(Context); + break; + case bitc::TYPE_CODE_METADATA: // METADATA + ResultTy = Type::getMetadataTy(Context); + break; + case bitc::TYPE_CODE_X86_MMX: // X86_MMX + ResultTy = Type::getX86_MMXTy(Context); + break; + case bitc::TYPE_CODE_INTEGER: // INTEGER: [width] + if (Record.size() < 1) + return Error("Invalid Integer type record"); + ResultTy = IntegerType::get(Context, Record[0]); + break; + case bitc::TYPE_CODE_OPAQUE: // OPAQUE + if (NextTypeID < TypeList.size() && TypeList[NextTypeID] == 0) + ResultTy = StructType::create(Context); + break; + case bitc::TYPE_CODE_STRUCT_OLD: {// STRUCT_OLD + if (NextTypeID >= TypeList.size()) break; + // If we already read it, don't reprocess. + if (TypeList[NextTypeID] && + !cast<StructType>(TypeList[NextTypeID])->isOpaque()) + break; + + // Set a type. + if (TypeList[NextTypeID] == 0) + TypeList[NextTypeID] = StructType::create(Context); + + std::vector<Type*> EltTys; + for (unsigned i = 1, e = Record.size(); i != e; ++i) { + if (Type *Elt = getTypeByIDOrNull(Record[i])) + EltTys.push_back(Elt); + else + break; + } + + if (EltTys.size() != Record.size()-1) + break; // Not all elements are ready. + + cast<StructType>(TypeList[NextTypeID])->setBody(EltTys, Record[0]); + ResultTy = TypeList[NextTypeID]; + TypeList[NextTypeID] = 0; + break; + } + case bitc::TYPE_CODE_POINTER: { // POINTER: [pointee type] or + // [pointee type, address space] + if (Record.size() < 1) + return Error("Invalid POINTER type record"); + unsigned AddressSpace = 0; + if (Record.size() == 2) + AddressSpace = Record[1]; + if ((ResultTy = getTypeByIDOrNull(Record[0]))) + ResultTy = PointerType::get(ResultTy, AddressSpace); + break; + } + case bitc::TYPE_CODE_FUNCTION: { + // FIXME: attrid is dead, remove it in LLVM 3.0 + // FUNCTION: [vararg, attrid, retty, paramty x N] + if (Record.size() < 3) + return Error("Invalid FUNCTION type record"); + std::vector<Type*> ArgTys; + for (unsigned i = 3, e = Record.size(); i != e; ++i) { + if (Type *Elt = getTypeByIDOrNull(Record[i])) + ArgTys.push_back(Elt); + else + break; + } + if (ArgTys.size()+3 != Record.size()) + break; // Something was null. + if ((ResultTy = getTypeByIDOrNull(Record[2]))) + ResultTy = FunctionType::get(ResultTy, ArgTys, Record[0]); + break; + } + case bitc::TYPE_CODE_ARRAY: // ARRAY: [numelts, eltty] + if (Record.size() < 2) + return Error("Invalid ARRAY type record"); + if ((ResultTy = getTypeByIDOrNull(Record[1]))) + ResultTy = ArrayType::get(ResultTy, Record[0]); + break; + case bitc::TYPE_CODE_VECTOR: // VECTOR: [numelts, eltty] + if (Record.size() < 2) + return Error("Invalid VECTOR type record"); + if ((ResultTy = getTypeByIDOrNull(Record[1]))) + ResultTy = VectorType::get(ResultTy, Record[0]); + break; + } + + if (NextTypeID >= TypeList.size()) + return Error("invalid TYPE table"); + + if (ResultTy && TypeList[NextTypeID] == 0) { + ++NumTypesRead; + ReadAnyTypes = true; + + TypeList[NextTypeID] = ResultTy; + } + + ++NextTypeID; + } +} + + +bool BitcodeReader::ParseOldTypeSymbolTable() { + if (Stream.EnterSubBlock(bitc::TYPE_SYMTAB_BLOCK_ID_OLD)) + return Error("Malformed block record"); + + SmallVector<uint64_t, 64> Record; + + // Read all the records for this type table. + std::string TypeName; + while (1) { + unsigned Code = Stream.ReadCode(); + if (Code == bitc::END_BLOCK) { + if (Stream.ReadBlockEnd()) + return Error("Error at end of type symbol table block"); + return false; + } + + if (Code == bitc::ENTER_SUBBLOCK) { + // No known subblocks, always skip them. + Stream.ReadSubBlockID(); + if (Stream.SkipBlock()) + return Error("Malformed block record"); + continue; + } + + if (Code == bitc::DEFINE_ABBREV) { + Stream.ReadAbbrevRecord(); + continue; + } + + // Read a record. + Record.clear(); + switch (Stream.ReadRecord(Code, Record)) { + default: // Default behavior: unknown type. + break; + case bitc::TST_CODE_ENTRY: // TST_ENTRY: [typeid, namechar x N] + if (ConvertToString(Record, 1, TypeName)) + return Error("Invalid TST_ENTRY record"); + unsigned TypeID = Record[0]; + if (TypeID >= TypeList.size()) + return Error("Invalid Type ID in TST_ENTRY record"); + + // Only apply the type name to a struct type with no name. + if (StructType *STy = dyn_cast<StructType>(TypeList[TypeID])) + if (!STy->isLiteral() && !STy->hasName()) + STy->setName(TypeName); + TypeName.clear(); + break; + } + } +} + +bool BitcodeReader::ParseValueSymbolTable() { + if (Stream.EnterSubBlock(bitc::VALUE_SYMTAB_BLOCK_ID)) + return Error("Malformed block record"); + + SmallVector<uint64_t, 64> Record; + + // Read all the records for this value table. + SmallString<128> ValueName; + while (1) { + unsigned Code = Stream.ReadCode(); + if (Code == bitc::END_BLOCK) { + if (Stream.ReadBlockEnd()) + return Error("Error at end of value symbol table block"); + return false; + } + if (Code == bitc::ENTER_SUBBLOCK) { + // No known subblocks, always skip them. + Stream.ReadSubBlockID(); + if (Stream.SkipBlock()) + return Error("Malformed block record"); + continue; + } + + if (Code == bitc::DEFINE_ABBREV) { + Stream.ReadAbbrevRecord(); + continue; + } + + // Read a record. + Record.clear(); + switch (Stream.ReadRecord(Code, Record)) { + default: // Default behavior: unknown type. + break; + case bitc::VST_CODE_ENTRY: { // VST_ENTRY: [valueid, namechar x N] + if (ConvertToString(Record, 1, ValueName)) + return Error("Invalid VST_ENTRY record"); + unsigned ValueID = Record[0]; + if (ValueID >= ValueList.size()) + return Error("Invalid Value ID in VST_ENTRY record"); + Value *V = ValueList[ValueID]; + + V->setName(StringRef(ValueName.data(), ValueName.size())); + ValueName.clear(); + break; + } + case bitc::VST_CODE_BBENTRY: { + if (ConvertToString(Record, 1, ValueName)) + return Error("Invalid VST_BBENTRY record"); + BasicBlock *BB = getBasicBlock(Record[0]); + if (BB == 0) + return Error("Invalid BB ID in VST_BBENTRY record"); + + BB->setName(StringRef(ValueName.data(), ValueName.size())); + ValueName.clear(); + break; + } + } + } +} + +bool BitcodeReader::ParseMetadata() { + unsigned NextMDValueNo = MDValueList.size(); + + if (Stream.EnterSubBlock(bitc::METADATA_BLOCK_ID)) + return Error("Malformed block record"); + + SmallVector<uint64_t, 64> Record; + + // Read all the records. + while (1) { + unsigned Code = Stream.ReadCode(); + if (Code == bitc::END_BLOCK) { + if (Stream.ReadBlockEnd()) + return Error("Error at end of PARAMATTR block"); + return false; + } + + if (Code == bitc::ENTER_SUBBLOCK) { + // No known subblocks, always skip them. + Stream.ReadSubBlockID(); + if (Stream.SkipBlock()) + return Error("Malformed block record"); + continue; + } + + if (Code == bitc::DEFINE_ABBREV) { + Stream.ReadAbbrevRecord(); + continue; + } + + bool IsFunctionLocal = false; + // Read a record. + Record.clear(); + Code = Stream.ReadRecord(Code, Record); + switch (Code) { + default: // Default behavior: ignore. + break; + case bitc::METADATA_NAME: { + // Read named of the named metadata. + unsigned NameLength = Record.size(); + SmallString<8> Name; + Name.resize(NameLength); + for (unsigned i = 0; i != NameLength; ++i) + Name[i] = Record[i]; + Record.clear(); + Code = Stream.ReadCode(); + + // METADATA_NAME is always followed by METADATA_NAMED_NODE. + unsigned NextBitCode = Stream.ReadRecord(Code, Record); + assert(NextBitCode == bitc::METADATA_NAMED_NODE); (void)NextBitCode; + + // Read named metadata elements. + unsigned Size = Record.size(); + NamedMDNode *NMD = TheModule->getOrInsertNamedMetadata(Name); + for (unsigned i = 0; i != Size; ++i) { + MDNode *MD = dyn_cast<MDNode>(MDValueList.getValueFwdRef(Record[i])); + if (MD == 0) + return Error("Malformed metadata record"); + NMD->addOperand(MD); + } + break; + } + case bitc::METADATA_FN_NODE: + IsFunctionLocal = true; + // fall-through + case bitc::METADATA_NODE: { + if (Record.size() % 2 == 1) + return Error("Invalid METADATA_NODE record"); + + unsigned Size = Record.size(); + SmallVector<Value*, 8> Elts; + for (unsigned i = 0; i != Size; i += 2) { + Type *Ty = getTypeByID(Record[i]); + if (!Ty) return Error("Invalid METADATA_NODE record"); + if (Ty->isMetadataTy()) + Elts.push_back(MDValueList.getValueFwdRef(Record[i+1])); + else if (!Ty->isVoidTy()) + Elts.push_back(ValueList.getValueFwdRef(Record[i+1], Ty)); + else + Elts.push_back(NULL); + } + Value *V = MDNode::getWhenValsUnresolved(Context, Elts, IsFunctionLocal); + IsFunctionLocal = false; + MDValueList.AssignValue(V, NextMDValueNo++); + break; + } + case bitc::METADATA_STRING: { + unsigned MDStringLength = Record.size(); + SmallString<8> String; + String.resize(MDStringLength); + for (unsigned i = 0; i != MDStringLength; ++i) + String[i] = Record[i]; + Value *V = MDString::get(Context, + StringRef(String.data(), String.size())); + MDValueList.AssignValue(V, NextMDValueNo++); + break; + } + case bitc::METADATA_KIND: { + unsigned RecordLength = Record.size(); + if (Record.empty() || RecordLength < 2) + return Error("Invalid METADATA_KIND record"); + SmallString<8> Name; + Name.resize(RecordLength-1); + unsigned Kind = Record[0]; + for (unsigned i = 1; i != RecordLength; ++i) + Name[i-1] = Record[i]; + + unsigned NewKind = TheModule->getMDKindID(Name.str()); + if (!MDKindMap.insert(std::make_pair(Kind, NewKind)).second) + return Error("Conflicting METADATA_KIND records"); + break; + } + } + } +} + +/// DecodeSignRotatedValue - Decode a signed value stored with the sign bit in +/// the LSB for dense VBR encoding. +static uint64_t DecodeSignRotatedValue(uint64_t V) { + if ((V & 1) == 0) + return V >> 1; + if (V != 1) + return -(V >> 1); + // There is no such thing as -0 with integers. "-0" really means MININT. + return 1ULL << 63; +} + +/// ResolveGlobalAndAliasInits - Resolve all of the initializers for global +/// values and aliases that we can. +bool BitcodeReader::ResolveGlobalAndAliasInits() { + std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInitWorklist; + std::vector<std::pair<GlobalAlias*, unsigned> > AliasInitWorklist; + + GlobalInitWorklist.swap(GlobalInits); + AliasInitWorklist.swap(AliasInits); + + while (!GlobalInitWorklist.empty()) { + unsigned ValID = GlobalInitWorklist.back().second; + if (ValID >= ValueList.size()) { + // Not ready to resolve this yet, it requires something later in the file. + GlobalInits.push_back(GlobalInitWorklist.back()); + } else { + if (Constant *C = dyn_cast<Constant>(ValueList[ValID])) + GlobalInitWorklist.back().first->setInitializer(C); + else + return Error("Global variable initializer is not a constant!"); + } + GlobalInitWorklist.pop_back(); + } + + while (!AliasInitWorklist.empty()) { + unsigned ValID = AliasInitWorklist.back().second; + if (ValID >= ValueList.size()) { + AliasInits.push_back(AliasInitWorklist.back()); + } else { + if (Constant *C = dyn_cast<Constant>(ValueList[ValID])) + AliasInitWorklist.back().first->setAliasee(C); + else + return Error("Alias initializer is not a constant!"); + } + AliasInitWorklist.pop_back(); + } + return false; +} + +bool BitcodeReader::ParseConstants() { + if (Stream.EnterSubBlock(bitc::CONSTANTS_BLOCK_ID)) + return Error("Malformed block record"); + + SmallVector<uint64_t, 64> Record; + + // Read all the records for this value table. + Type *CurTy = Type::getInt32Ty(Context); + unsigned NextCstNo = ValueList.size(); + while (1) { + unsigned Code = Stream.ReadCode(); + if (Code == bitc::END_BLOCK) + break; + + if (Code == bitc::ENTER_SUBBLOCK) { + // No known subblocks, always skip them. + Stream.ReadSubBlockID(); + if (Stream.SkipBlock()) + return Error("Malformed block record"); + continue; + } + + if (Code == bitc::DEFINE_ABBREV) { + Stream.ReadAbbrevRecord(); + continue; + } + + // Read a record. + Record.clear(); + Value *V = 0; + unsigned BitCode = Stream.ReadRecord(Code, Record); + switch (BitCode) { + default: // Default behavior: unknown constant + case bitc::CST_CODE_UNDEF: // UNDEF + V = UndefValue::get(CurTy); + break; + case bitc::CST_CODE_SETTYPE: // SETTYPE: [typeid] + if (Record.empty()) + return Error("Malformed CST_SETTYPE record"); + if (Record[0] >= TypeList.size()) + return Error("Invalid Type ID in CST_SETTYPE record"); + CurTy = TypeList[Record[0]]; + continue; // Skip the ValueList manipulation. + case bitc::CST_CODE_NULL: // NULL + V = Constant::getNullValue(CurTy); + break; + case bitc::CST_CODE_INTEGER: // INTEGER: [intval] + if (!CurTy->isIntegerTy() || Record.empty()) + return Error("Invalid CST_INTEGER record"); + V = ConstantInt::get(CurTy, DecodeSignRotatedValue(Record[0])); + break; + case bitc::CST_CODE_WIDE_INTEGER: {// WIDE_INTEGER: [n x intval] + if (!CurTy->isIntegerTy() || Record.empty()) + return Error("Invalid WIDE_INTEGER record"); + + unsigned NumWords = Record.size(); + SmallVector<uint64_t, 8> Words; + Words.resize(NumWords); + for (unsigned i = 0; i != NumWords; ++i) + Words[i] = DecodeSignRotatedValue(Record[i]); + V = ConstantInt::get(Context, + APInt(cast<IntegerType>(CurTy)->getBitWidth(), + Words)); + break; + } + case bitc::CST_CODE_FLOAT: { // FLOAT: [fpval] + if (Record.empty()) + return Error("Invalid FLOAT record"); + if (CurTy->isFloatTy()) + V = ConstantFP::get(Context, APFloat(APInt(32, (uint32_t)Record[0]))); + else if (CurTy->isDoubleTy()) + V = ConstantFP::get(Context, APFloat(APInt(64, Record[0]))); + else if (CurTy->isX86_FP80Ty()) { + // Bits are not stored the same way as a normal i80 APInt, compensate. + uint64_t Rearrange[2]; + Rearrange[0] = (Record[1] & 0xffffLL) | (Record[0] << 16); + Rearrange[1] = Record[0] >> 48; + V = ConstantFP::get(Context, APFloat(APInt(80, Rearrange))); + } else if (CurTy->isFP128Ty()) + V = ConstantFP::get(Context, APFloat(APInt(128, Record), true)); + else if (CurTy->isPPC_FP128Ty()) + V = ConstantFP::get(Context, APFloat(APInt(128, Record))); + else + V = UndefValue::get(CurTy); + break; + } + + case bitc::CST_CODE_AGGREGATE: {// AGGREGATE: [n x value number] + if (Record.empty()) + return Error("Invalid CST_AGGREGATE record"); + + unsigned Size = Record.size(); + std::vector<Constant*> Elts; + + if (StructType *STy = dyn_cast<StructType>(CurTy)) { + for (unsigned i = 0; i != Size; ++i) + Elts.push_back(ValueList.getConstantFwdRef(Record[i], + STy->getElementType(i))); + V = ConstantStruct::get(STy, Elts); + } else if (ArrayType *ATy = dyn_cast<ArrayType>(CurTy)) { + Type *EltTy = ATy->getElementType(); + for (unsigned i = 0; i != Size; ++i) + Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy)); + V = ConstantArray::get(ATy, Elts); + } else if (VectorType *VTy = dyn_cast<VectorType>(CurTy)) { + Type *EltTy = VTy->getElementType(); + for (unsigned i = 0; i != Size; ++i) + Elts.push_back(ValueList.getConstantFwdRef(Record[i], EltTy)); + V = ConstantVector::get(Elts); + } else { + V = UndefValue::get(CurTy); + } + break; + } + case bitc::CST_CODE_STRING: { // STRING: [values] + if (Record.empty()) + return Error("Invalid CST_AGGREGATE record"); + + ArrayType *ATy = cast<ArrayType>(CurTy); + Type *EltTy = ATy->getElementType(); + + unsigned Size = Record.size(); + std::vector<Constant*> Elts; + for (unsigned i = 0; i != Size; ++i) + Elts.push_back(ConstantInt::get(EltTy, Record[i])); + V = ConstantArray::get(ATy, Elts); + break; + } + case bitc::CST_CODE_CSTRING: { // CSTRING: [values] + if (Record.empty()) + return Error("Invalid CST_AGGREGATE record"); + + ArrayType *ATy = cast<ArrayType>(CurTy); + Type *EltTy = ATy->getElementType(); + + unsigned Size = Record.size(); + std::vector<Constant*> Elts; + for (unsigned i = 0; i != Size; ++i) + Elts.push_back(ConstantInt::get(EltTy, Record[i])); + Elts.push_back(Constant::getNullValue(EltTy)); + V = ConstantArray::get(ATy, Elts); + break; + } + case bitc::CST_CODE_CE_BINOP: { // CE_BINOP: [opcode, opval, opval] + if (Record.size() < 3) return Error("Invalid CE_BINOP record"); + int Opc = GetDecodedBinaryOpcode(Record[0], CurTy); + if (Opc < 0) { + V = UndefValue::get(CurTy); // Unknown binop. + } else { + Constant *LHS = ValueList.getConstantFwdRef(Record[1], CurTy); + Constant *RHS = ValueList.getConstantFwdRef(Record[2], CurTy); + unsigned Flags = 0; + if (Record.size() >= 4) { + if (Opc == Instruction::Add || + Opc == Instruction::Sub || + Opc == Instruction::Mul || + Opc == Instruction::Shl) { + if (Record[3] & (1 << bitc::OBO_NO_SIGNED_WRAP)) + Flags |= OverflowingBinaryOperator::NoSignedWrap; + if (Record[3] & (1 << bitc::OBO_NO_UNSIGNED_WRAP)) + Flags |= OverflowingBinaryOperator::NoUnsignedWrap; + } else if (Opc == Instruction::SDiv || + Opc == Instruction::UDiv || + Opc == Instruction::LShr || + Opc == Instruction::AShr) { + if (Record[3] & (1 << bitc::PEO_EXACT)) + Flags |= SDivOperator::IsExact; + } + } + V = ConstantExpr::get(Opc, LHS, RHS, Flags); + } + break; + } + case bitc::CST_CODE_CE_CAST: { // CE_CAST: [opcode, opty, opval] + if (Record.size() < 3) return Error("Invalid CE_CAST record"); + int Opc = GetDecodedCastOpcode(Record[0]); + if (Opc < 0) { + V = UndefValue::get(CurTy); // Unknown cast. + } else { + Type *OpTy = getTypeByID(Record[1]); + if (!OpTy) return Error("Invalid CE_CAST record"); + Constant *Op = ValueList.getConstantFwdRef(Record[2], OpTy); + V = ConstantExpr::getCast(Opc, Op, CurTy); + } + break; + } + case bitc::CST_CODE_CE_INBOUNDS_GEP: + case bitc::CST_CODE_CE_GEP: { // CE_GEP: [n x operands] + if (Record.size() & 1) return Error("Invalid CE_GEP record"); + SmallVector<Constant*, 16> Elts; + for (unsigned i = 0, e = Record.size(); i != e; i += 2) { + Type *ElTy = getTypeByID(Record[i]); + if (!ElTy) return Error("Invalid CE_GEP record"); + Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], ElTy)); + } + ArrayRef<Constant *> Indices(Elts.begin() + 1, Elts.end()); + V = ConstantExpr::getGetElementPtr(Elts[0], Indices, + BitCode == + bitc::CST_CODE_CE_INBOUNDS_GEP); + break; + } + case bitc::CST_CODE_CE_SELECT: // CE_SELECT: [opval#, opval#, opval#] + if (Record.size() < 3) return Error("Invalid CE_SELECT record"); + V = ConstantExpr::getSelect(ValueList.getConstantFwdRef(Record[0], + Type::getInt1Ty(Context)), + ValueList.getConstantFwdRef(Record[1],CurTy), + ValueList.getConstantFwdRef(Record[2],CurTy)); + break; + case bitc::CST_CODE_CE_EXTRACTELT: { // CE_EXTRACTELT: [opty, opval, opval] + if (Record.size() < 3) return Error("Invalid CE_EXTRACTELT record"); + VectorType *OpTy = + dyn_cast_or_null<VectorType>(getTypeByID(Record[0])); + if (OpTy == 0) return Error("Invalid CE_EXTRACTELT record"); + Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); + Constant *Op1 = ValueList.getConstantFwdRef(Record[2], Type::getInt32Ty(Context)); + V = ConstantExpr::getExtractElement(Op0, Op1); + break; + } + case bitc::CST_CODE_CE_INSERTELT: { // CE_INSERTELT: [opval, opval, opval] + VectorType *OpTy = dyn_cast<VectorType>(CurTy); + if (Record.size() < 3 || OpTy == 0) + return Error("Invalid CE_INSERTELT record"); + Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); + Constant *Op1 = ValueList.getConstantFwdRef(Record[1], + OpTy->getElementType()); + Constant *Op2 = ValueList.getConstantFwdRef(Record[2], Type::getInt32Ty(Context)); + V = ConstantExpr::getInsertElement(Op0, Op1, Op2); + break; + } + case bitc::CST_CODE_CE_SHUFFLEVEC: { // CE_SHUFFLEVEC: [opval, opval, opval] + VectorType *OpTy = dyn_cast<VectorType>(CurTy); + if (Record.size() < 3 || OpTy == 0) + return Error("Invalid CE_SHUFFLEVEC record"); + Constant *Op0 = ValueList.getConstantFwdRef(Record[0], OpTy); + Constant *Op1 = ValueList.getConstantFwdRef(Record[1], OpTy); + Type *ShufTy = VectorType::get(Type::getInt32Ty(Context), + OpTy->getNumElements()); + Constant *Op2 = ValueList.getConstantFwdRef(Record[2], ShufTy); + V = ConstantExpr::getShuffleVector(Op0, Op1, Op2); + break; + } + case bitc::CST_CODE_CE_SHUFVEC_EX: { // [opty, opval, opval, opval] + VectorType *RTy = dyn_cast<VectorType>(CurTy); + VectorType *OpTy = + dyn_cast_or_null<VectorType>(getTypeByID(Record[0])); + if (Record.size() < 4 || RTy == 0 || OpTy == 0) + return Error("Invalid CE_SHUFVEC_EX record"); + Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); + Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy); + Type *ShufTy = VectorType::get(Type::getInt32Ty(Context), + RTy->getNumElements()); + Constant *Op2 = ValueList.getConstantFwdRef(Record[3], ShufTy); + V = ConstantExpr::getShuffleVector(Op0, Op1, Op2); + break; + } + case bitc::CST_CODE_CE_CMP: { // CE_CMP: [opty, opval, opval, pred] + if (Record.size() < 4) return Error("Invalid CE_CMP record"); + Type *OpTy = getTypeByID(Record[0]); + if (OpTy == 0) return Error("Invalid CE_CMP record"); + Constant *Op0 = ValueList.getConstantFwdRef(Record[1], OpTy); + Constant *Op1 = ValueList.getConstantFwdRef(Record[2], OpTy); + + if (OpTy->isFPOrFPVectorTy()) + V = ConstantExpr::getFCmp(Record[3], Op0, Op1); + else + V = ConstantExpr::getICmp(Record[3], Op0, Op1); + break; + } + case bitc::CST_CODE_INLINEASM: { + if (Record.size() < 2) return Error("Invalid INLINEASM record"); + std::string AsmStr, ConstrStr; + bool HasSideEffects = Record[0] & 1; + bool IsAlignStack = Record[0] >> 1; + unsigned AsmStrSize = Record[1]; + if (2+AsmStrSize >= Record.size()) + return Error("Invalid INLINEASM record"); + unsigned ConstStrSize = Record[2+AsmStrSize]; + if (3+AsmStrSize+ConstStrSize > Record.size()) + return Error("Invalid INLINEASM record"); + + for (unsigned i = 0; i != AsmStrSize; ++i) + AsmStr += (char)Record[2+i]; + for (unsigned i = 0; i != ConstStrSize; ++i) + ConstrStr += (char)Record[3+AsmStrSize+i]; + PointerType *PTy = cast<PointerType>(CurTy); + V = InlineAsm::get(cast<FunctionType>(PTy->getElementType()), + AsmStr, ConstrStr, HasSideEffects, IsAlignStack); + break; + } + case bitc::CST_CODE_BLOCKADDRESS:{ + if (Record.size() < 3) return Error("Invalid CE_BLOCKADDRESS record"); + Type *FnTy = getTypeByID(Record[0]); + if (FnTy == 0) return Error("Invalid CE_BLOCKADDRESS record"); + Function *Fn = + dyn_cast_or_null<Function>(ValueList.getConstantFwdRef(Record[1],FnTy)); + if (Fn == 0) return Error("Invalid CE_BLOCKADDRESS record"); + + GlobalVariable *FwdRef = new GlobalVariable(*Fn->getParent(), + Type::getInt8Ty(Context), + false, GlobalValue::InternalLinkage, + 0, ""); + BlockAddrFwdRefs[Fn].push_back(std::make_pair(Record[2], FwdRef)); + V = FwdRef; + break; + } + } + + ValueList.AssignValue(V, NextCstNo); + ++NextCstNo; + } + + if (NextCstNo != ValueList.size()) + return Error("Invalid constant reference!"); + + if (Stream.ReadBlockEnd()) + return Error("Error at end of constants block"); + + // Once all the constants have been read, go through and resolve forward + // references. + ValueList.ResolveConstantForwardRefs(); + return false; +} + +/// RememberAndSkipFunctionBody - When we see the block for a function body, +/// remember where it is and then skip it. This lets us lazily deserialize the +/// functions. +bool BitcodeReader::RememberAndSkipFunctionBody() { + // Get the function we are talking about. + if (FunctionsWithBodies.empty()) + return Error("Insufficient function protos"); + + Function *Fn = FunctionsWithBodies.back(); + FunctionsWithBodies.pop_back(); + + // Save the current stream state. + uint64_t CurBit = Stream.GetCurrentBitNo(); + DeferredFunctionInfo[Fn] = CurBit; + + // Skip over the function block for now. + if (Stream.SkipBlock()) + return Error("Malformed block record"); + return false; +} + +bool BitcodeReader::ParseModule() { + if (Stream.EnterSubBlock(bitc::MODULE_BLOCK_ID)) + return Error("Malformed block record"); + + SmallVector<uint64_t, 64> Record; + std::vector<std::string> SectionTable; + std::vector<std::string> GCTable; + + // Read all the records for this module. + while (!Stream.AtEndOfStream()) { + unsigned Code = Stream.ReadCode(); + if (Code == bitc::END_BLOCK) { + if (Stream.ReadBlockEnd()) + return Error("Error at end of module block"); + + // Patch the initializers for globals and aliases up. + ResolveGlobalAndAliasInits(); + if (!GlobalInits.empty() || !AliasInits.empty()) + return Error("Malformed global initializer set"); + if (!FunctionsWithBodies.empty()) + return Error("Too few function bodies found"); + + // Look for intrinsic functions which need to be upgraded at some point + for (Module::iterator FI = TheModule->begin(), FE = TheModule->end(); + FI != FE; ++FI) { + Function* NewFn; + if (UpgradeIntrinsicFunction(FI, NewFn)) + UpgradedIntrinsics.push_back(std::make_pair(FI, NewFn)); + } + + // Look for global variables which need to be renamed. + for (Module::global_iterator + GI = TheModule->global_begin(), GE = TheModule->global_end(); + GI != GE; ++GI) + UpgradeGlobalVariable(GI); + + // Force deallocation of memory for these vectors to favor the client that + // want lazy deserialization. + std::vector<std::pair<GlobalVariable*, unsigned> >().swap(GlobalInits); + std::vector<std::pair<GlobalAlias*, unsigned> >().swap(AliasInits); + std::vector<Function*>().swap(FunctionsWithBodies); + return false; + } + + if (Code == bitc::ENTER_SUBBLOCK) { + switch (Stream.ReadSubBlockID()) { + default: // Skip unknown content. + if (Stream.SkipBlock()) + return Error("Malformed block record"); + break; + case bitc::BLOCKINFO_BLOCK_ID: + if (Stream.ReadBlockInfoBlock()) + return Error("Malformed BlockInfoBlock"); + break; + case bitc::PARAMATTR_BLOCK_ID: + if (ParseAttributeBlock()) + return true; + break; + case bitc::TYPE_BLOCK_ID_NEW: + if (ParseTypeTable()) + return true; + break; + case bitc::TYPE_BLOCK_ID_OLD: + if (ParseOldTypeTable()) + return true; + break; + case bitc::TYPE_SYMTAB_BLOCK_ID_OLD: + if (ParseOldTypeSymbolTable()) + return true; + break; + case bitc::VALUE_SYMTAB_BLOCK_ID: + if (ParseValueSymbolTable()) + return true; + break; + case bitc::CONSTANTS_BLOCK_ID: + if (ParseConstants() || ResolveGlobalAndAliasInits()) + return true; + break; + case bitc::METADATA_BLOCK_ID: + if (ParseMetadata()) + return true; + break; + case bitc::FUNCTION_BLOCK_ID: + // If this is the first function body we've seen, reverse the + // FunctionsWithBodies list. + if (!HasReversedFunctionsWithBodies) { + std::reverse(FunctionsWithBodies.begin(), FunctionsWithBodies.end()); + HasReversedFunctionsWithBodies = true; + } + + if (RememberAndSkipFunctionBody()) + return true; + break; + } + continue; + } + + if (Code == bitc::DEFINE_ABBREV) { + Stream.ReadAbbrevRecord(); + continue; + } + + // Read a record. + switch (Stream.ReadRecord(Code, Record)) { + default: break; // Default behavior, ignore unknown content. + case bitc::MODULE_CODE_VERSION: // VERSION: [version#] + if (Record.size() < 1) + return Error("Malformed MODULE_CODE_VERSION"); + // Only version #0 is supported so far. + if (Record[0] != 0) + return Error("Unknown bitstream version!"); + break; + case bitc::MODULE_CODE_TRIPLE: { // TRIPLE: [strchr x N] + std::string S; + if (ConvertToString(Record, 0, S)) + return Error("Invalid MODULE_CODE_TRIPLE record"); + TheModule->setTargetTriple(S); + break; + } + case bitc::MODULE_CODE_DATALAYOUT: { // DATALAYOUT: [strchr x N] + std::string S; + if (ConvertToString(Record, 0, S)) + return Error("Invalid MODULE_CODE_DATALAYOUT record"); + TheModule->setDataLayout(S); + break; + } + case bitc::MODULE_CODE_ASM: { // ASM: [strchr x N] + std::string S; + if (ConvertToString(Record, 0, S)) + return Error("Invalid MODULE_CODE_ASM record"); + TheModule->setModuleInlineAsm(S); + break; + } + case bitc::MODULE_CODE_DEPLIB: { // DEPLIB: [strchr x N] + std::string S; + if (ConvertToString(Record, 0, S)) + return Error("Invalid MODULE_CODE_DEPLIB record"); + TheModule->addLibrary(S); + break; + } + case bitc::MODULE_CODE_SECTIONNAME: { // SECTIONNAME: [strchr x N] + std::string S; + if (ConvertToString(Record, 0, S)) + return Error("Invalid MODULE_CODE_SECTIONNAME record"); + SectionTable.push_back(S); + break; + } + case bitc::MODULE_CODE_GCNAME: { // SECTIONNAME: [strchr x N] + std::string S; + if (ConvertToString(Record, 0, S)) + return Error("Invalid MODULE_CODE_GCNAME record"); + GCTable.push_back(S); + break; + } + // GLOBALVAR: [pointer type, isconst, initid, + // linkage, alignment, section, visibility, threadlocal, + // unnamed_addr] + case bitc::MODULE_CODE_GLOBALVAR: { + if (Record.size() < 6) + return Error("Invalid MODULE_CODE_GLOBALVAR record"); + Type *Ty = getTypeByID(Record[0]); + if (!Ty) return Error("Invalid MODULE_CODE_GLOBALVAR record"); + if (!Ty->isPointerTy()) + return Error("Global not a pointer type!"); + unsigned AddressSpace = cast<PointerType>(Ty)->getAddressSpace(); + Ty = cast<PointerType>(Ty)->getElementType(); + + bool isConstant = Record[1]; + GlobalValue::LinkageTypes Linkage = GetDecodedLinkage(Record[3]); + unsigned Alignment = (1 << Record[4]) >> 1; + std::string Section; + if (Record[5]) { + if (Record[5]-1 >= SectionTable.size()) + return Error("Invalid section ID"); + Section = SectionTable[Record[5]-1]; + } + GlobalValue::VisibilityTypes Visibility = GlobalValue::DefaultVisibility; + if (Record.size() > 6) + Visibility = GetDecodedVisibility(Record[6]); + bool isThreadLocal = false; + if (Record.size() > 7) + isThreadLocal = Record[7]; + + bool UnnamedAddr = false; + if (Record.size() > 8) + UnnamedAddr = Record[8]; + + GlobalVariable *NewGV = + new GlobalVariable(*TheModule, Ty, isConstant, Linkage, 0, "", 0, + isThreadLocal, AddressSpace); + NewGV->setAlignment(Alignment); + if (!Section.empty()) + NewGV->setSection(Section); + NewGV->setVisibility(Visibility); + NewGV->setThreadLocal(isThreadLocal); + NewGV->setUnnamedAddr(UnnamedAddr); + + ValueList.push_back(NewGV); + + // Remember which value to use for the global initializer. + if (unsigned InitID = Record[2]) + GlobalInits.push_back(std::make_pair(NewGV, InitID-1)); + break; + } + // FUNCTION: [type, callingconv, isproto, linkage, paramattr, + // alignment, section, visibility, gc, unnamed_addr] + case bitc::MODULE_CODE_FUNCTION: { + if (Record.size() < 8) + return Error("Invalid MODULE_CODE_FUNCTION record"); + Type *Ty = getTypeByID(Record[0]); + if (!Ty) return Error("Invalid MODULE_CODE_FUNCTION record"); + if (!Ty->isPointerTy()) + return Error("Function not a pointer type!"); + FunctionType *FTy = + dyn_cast<FunctionType>(cast<PointerType>(Ty)->getElementType()); + if (!FTy) + return Error("Function not a pointer to function type!"); + + Function *Func = Function::Create(FTy, GlobalValue::ExternalLinkage, + "", TheModule); + + Func->setCallingConv(static_cast<CallingConv::ID>(Record[1])); + bool isProto = Record[2]; + Func->setLinkage(GetDecodedLinkage(Record[3])); + Func->setAttributes(getAttributes(Record[4])); + + Func->setAlignment((1 << Record[5]) >> 1); + if (Record[6]) { + if (Record[6]-1 >= SectionTable.size()) + return Error("Invalid section ID"); + Func->setSection(SectionTable[Record[6]-1]); + } + Func->setVisibility(GetDecodedVisibility(Record[7])); + if (Record.size() > 8 && Record[8]) { + if (Record[8]-1 > GCTable.size()) + return Error("Invalid GC ID"); + Func->setGC(GCTable[Record[8]-1].c_str()); + } + bool UnnamedAddr = false; + if (Record.size() > 9) + UnnamedAddr = Record[9]; + Func->setUnnamedAddr(UnnamedAddr); + ValueList.push_back(Func); + + // If this is a function with a body, remember the prototype we are + // creating now, so that we can match up the body with them later. + if (!isProto) + FunctionsWithBodies.push_back(Func); + break; + } + // ALIAS: [alias type, aliasee val#, linkage] + // ALIAS: [alias type, aliasee val#, linkage, visibility] + case bitc::MODULE_CODE_ALIAS: { + if (Record.size() < 3) + return Error("Invalid MODULE_ALIAS record"); + Type *Ty = getTypeByID(Record[0]); + if (!Ty) return Error("Invalid MODULE_ALIAS record"); + if (!Ty->isPointerTy()) + return Error("Function not a pointer type!"); + + GlobalAlias *NewGA = new GlobalAlias(Ty, GetDecodedLinkage(Record[2]), + "", 0, TheModule); + // Old bitcode files didn't have visibility field. + if (Record.size() > 3) + NewGA->setVisibility(GetDecodedVisibility(Record[3])); + ValueList.push_back(NewGA); + AliasInits.push_back(std::make_pair(NewGA, Record[1])); + break; + } + /// MODULE_CODE_PURGEVALS: [numvals] + case bitc::MODULE_CODE_PURGEVALS: + // Trim down the value list to the specified size. + if (Record.size() < 1 || Record[0] > ValueList.size()) + return Error("Invalid MODULE_PURGEVALS record"); + ValueList.shrinkTo(Record[0]); + break; + } + Record.clear(); + } + + return Error("Premature end of bitstream"); +} + +bool BitcodeReader::ParseBitcodeInto(Module *M) { + TheModule = 0; + + unsigned char *BufPtr = (unsigned char *)Buffer->getBufferStart(); + unsigned char *BufEnd = BufPtr+Buffer->getBufferSize(); + + if (Buffer->getBufferSize() & 3) { + if (!isRawBitcode(BufPtr, BufEnd) && !isBitcodeWrapper(BufPtr, BufEnd)) + return Error("Invalid bitcode signature"); + else + return Error("Bitcode stream should be a multiple of 4 bytes in length"); + } + + // If we have a wrapper header, parse it and ignore the non-bc file contents. + // The magic number is 0x0B17C0DE stored in little endian. + if (isBitcodeWrapper(BufPtr, BufEnd)) + if (SkipBitcodeWrapperHeader(BufPtr, BufEnd)) + return Error("Invalid bitcode wrapper header"); + + StreamFile.init(BufPtr, BufEnd); + Stream.init(StreamFile); + + // Sniff for the signature. + if (Stream.Read(8) != 'B' || + Stream.Read(8) != 'C' || + Stream.Read(4) != 0x0 || + Stream.Read(4) != 0xC || + Stream.Read(4) != 0xE || + Stream.Read(4) != 0xD) + return Error("Invalid bitcode signature"); + + // We expect a number of well-defined blocks, though we don't necessarily + // need to understand them all. + while (!Stream.AtEndOfStream()) { + unsigned Code = Stream.ReadCode(); + + if (Code != bitc::ENTER_SUBBLOCK) { + + // The ranlib in xcode 4 will align archive members by appending newlines + // to the end of them. If this file size is a multiple of 4 but not 8, we + // have to read and ignore these final 4 bytes :-( + if (Stream.GetAbbrevIDWidth() == 2 && Code == 2 && + Stream.Read(6) == 2 && Stream.Read(24) == 0xa0a0a && + Stream.AtEndOfStream()) + return false; + + return Error("Invalid record at top-level"); + } + + unsigned BlockID = Stream.ReadSubBlockID(); + + // We only know the MODULE subblock ID. + switch (BlockID) { + case bitc::BLOCKINFO_BLOCK_ID: + if (Stream.ReadBlockInfoBlock()) + return Error("Malformed BlockInfoBlock"); + break; + case bitc::MODULE_BLOCK_ID: + // Reject multiple MODULE_BLOCK's in a single bitstream. + if (TheModule) + return Error("Multiple MODULE_BLOCKs in same stream"); + TheModule = M; + if (ParseModule()) + return true; + break; + default: + if (Stream.SkipBlock()) + return Error("Malformed block record"); + break; + } + } + + return false; +} + +bool BitcodeReader::ParseModuleTriple(std::string &Triple) { + if (Stream.EnterSubBlock(bitc::MODULE_BLOCK_ID)) + return Error("Malformed block record"); + + SmallVector<uint64_t, 64> Record; + + // Read all the records for this module. + while (!Stream.AtEndOfStream()) { + unsigned Code = Stream.ReadCode(); + if (Code == bitc::END_BLOCK) { + if (Stream.ReadBlockEnd()) + return Error("Error at end of module block"); + + return false; + } + + if (Code == bitc::ENTER_SUBBLOCK) { + switch (Stream.ReadSubBlockID()) { + default: // Skip unknown content. + if (Stream.SkipBlock()) + return Error("Malformed block record"); + break; + } + continue; + } + + if (Code == bitc::DEFINE_ABBREV) { + Stream.ReadAbbrevRecord(); + continue; + } + + // Read a record. + switch (Stream.ReadRecord(Code, Record)) { + default: break; // Default behavior, ignore unknown content. + case bitc::MODULE_CODE_VERSION: // VERSION: [version#] + if (Record.size() < 1) + return Error("Malformed MODULE_CODE_VERSION"); + // Only version #0 is supported so far. + if (Record[0] != 0) + return Error("Unknown bitstream version!"); + break; + case bitc::MODULE_CODE_TRIPLE: { // TRIPLE: [strchr x N] + std::string S; + if (ConvertToString(Record, 0, S)) + return Error("Invalid MODULE_CODE_TRIPLE record"); + Triple = S; + break; + } + } + Record.clear(); + } + + return Error("Premature end of bitstream"); +} + +bool BitcodeReader::ParseTriple(std::string &Triple) { + if (Buffer->getBufferSize() & 3) + return Error("Bitcode stream should be a multiple of 4 bytes in length"); + + unsigned char *BufPtr = (unsigned char *)Buffer->getBufferStart(); + unsigned char *BufEnd = BufPtr+Buffer->getBufferSize(); + + // If we have a wrapper header, parse it and ignore the non-bc file contents. + // The magic number is 0x0B17C0DE stored in little endian. + if (isBitcodeWrapper(BufPtr, BufEnd)) + if (SkipBitcodeWrapperHeader(BufPtr, BufEnd)) + return Error("Invalid bitcode wrapper header"); + + StreamFile.init(BufPtr, BufEnd); + Stream.init(StreamFile); + + // Sniff for the signature. + if (Stream.Read(8) != 'B' || + Stream.Read(8) != 'C' || + Stream.Read(4) != 0x0 || + Stream.Read(4) != 0xC || + Stream.Read(4) != 0xE || + Stream.Read(4) != 0xD) + return Error("Invalid bitcode signature"); + + // We expect a number of well-defined blocks, though we don't necessarily + // need to understand them all. + while (!Stream.AtEndOfStream()) { + unsigned Code = Stream.ReadCode(); + + if (Code != bitc::ENTER_SUBBLOCK) + return Error("Invalid record at top-level"); + + unsigned BlockID = Stream.ReadSubBlockID(); + + // We only know the MODULE subblock ID. + switch (BlockID) { + case bitc::MODULE_BLOCK_ID: + if (ParseModuleTriple(Triple)) + return true; + break; + default: + if (Stream.SkipBlock()) + return Error("Malformed block record"); + break; + } + } + + return false; +} + +/// ParseMetadataAttachment - Parse metadata attachments. +bool BitcodeReader::ParseMetadataAttachment() { + if (Stream.EnterSubBlock(bitc::METADATA_ATTACHMENT_ID)) + return Error("Malformed block record"); + + SmallVector<uint64_t, 64> Record; + while(1) { + unsigned Code = Stream.ReadCode(); + if (Code == bitc::END_BLOCK) { + if (Stream.ReadBlockEnd()) + return Error("Error at end of PARAMATTR block"); + break; + } + if (Code == bitc::DEFINE_ABBREV) { + Stream.ReadAbbrevRecord(); + continue; + } + // Read a metadata attachment record. + Record.clear(); + switch (Stream.ReadRecord(Code, Record)) { + default: // Default behavior: ignore. + break; + case bitc::METADATA_ATTACHMENT: { + unsigned RecordLength = Record.size(); + if (Record.empty() || (RecordLength - 1) % 2 == 1) + return Error ("Invalid METADATA_ATTACHMENT reader!"); + Instruction *Inst = InstructionList[Record[0]]; + for (unsigned i = 1; i != RecordLength; i = i+2) { + unsigned Kind = Record[i]; + DenseMap<unsigned, unsigned>::iterator I = + MDKindMap.find(Kind); + if (I == MDKindMap.end()) + return Error("Invalid metadata kind ID"); + Value *Node = MDValueList.getValueFwdRef(Record[i+1]); + Inst->setMetadata(I->second, cast<MDNode>(Node)); + } + break; + } + } + } + return false; +} + +/// ParseFunctionBody - Lazily parse the specified function body block. +bool BitcodeReader::ParseFunctionBody(Function *F) { + if (Stream.EnterSubBlock(bitc::FUNCTION_BLOCK_ID)) + return Error("Malformed block record"); + + InstructionList.clear(); + unsigned ModuleValueListSize = ValueList.size(); + unsigned ModuleMDValueListSize = MDValueList.size(); + + // Add all the function arguments to the value table. + for(Function::arg_iterator I = F->arg_begin(), E = F->arg_end(); I != E; ++I) + ValueList.push_back(I); + + unsigned NextValueNo = ValueList.size(); + BasicBlock *CurBB = 0; + unsigned CurBBNo = 0; + + DebugLoc LastLoc; + + // Read all the records. + SmallVector<uint64_t, 64> Record; + while (1) { + unsigned Code = Stream.ReadCode(); + if (Code == bitc::END_BLOCK) { + if (Stream.ReadBlockEnd()) + return Error("Error at end of function block"); + break; + } + + if (Code == bitc::ENTER_SUBBLOCK) { + switch (Stream.ReadSubBlockID()) { + default: // Skip unknown content. + if (Stream.SkipBlock()) + return Error("Malformed block record"); + break; + case bitc::CONSTANTS_BLOCK_ID: + if (ParseConstants()) return true; + NextValueNo = ValueList.size(); + break; + case bitc::VALUE_SYMTAB_BLOCK_ID: + if (ParseValueSymbolTable()) return true; + break; + case bitc::METADATA_ATTACHMENT_ID: + if (ParseMetadataAttachment()) return true; + break; + case bitc::METADATA_BLOCK_ID: + if (ParseMetadata()) return true; + break; + } + continue; + } + + if (Code == bitc::DEFINE_ABBREV) { + Stream.ReadAbbrevRecord(); + continue; + } + + // Read a record. + Record.clear(); + Instruction *I = 0; + unsigned BitCode = Stream.ReadRecord(Code, Record); + switch (BitCode) { + default: // Default behavior: reject + return Error("Unknown instruction"); + case bitc::FUNC_CODE_DECLAREBLOCKS: // DECLAREBLOCKS: [nblocks] + if (Record.size() < 1 || Record[0] == 0) + return Error("Invalid DECLAREBLOCKS record"); + // Create all the basic blocks for the function. + FunctionBBs.resize(Record[0]); + for (unsigned i = 0, e = FunctionBBs.size(); i != e; ++i) + FunctionBBs[i] = BasicBlock::Create(Context, "", F); + CurBB = FunctionBBs[0]; + continue; + + case bitc::FUNC_CODE_DEBUG_LOC_AGAIN: // DEBUG_LOC_AGAIN + // This record indicates that the last instruction is at the same + // location as the previous instruction with a location. + I = 0; + + // Get the last instruction emitted. + if (CurBB && !CurBB->empty()) + I = &CurBB->back(); + else if (CurBBNo && FunctionBBs[CurBBNo-1] && + !FunctionBBs[CurBBNo-1]->empty()) + I = &FunctionBBs[CurBBNo-1]->back(); + + if (I == 0) return Error("Invalid DEBUG_LOC_AGAIN record"); + I->setDebugLoc(LastLoc); + I = 0; + continue; + + case bitc::FUNC_CODE_DEBUG_LOC: { // DEBUG_LOC: [line, col, scope, ia] + I = 0; // Get the last instruction emitted. + if (CurBB && !CurBB->empty()) + I = &CurBB->back(); + else if (CurBBNo && FunctionBBs[CurBBNo-1] && + !FunctionBBs[CurBBNo-1]->empty()) + I = &FunctionBBs[CurBBNo-1]->back(); + if (I == 0 || Record.size() < 4) + return Error("Invalid FUNC_CODE_DEBUG_LOC record"); + + unsigned Line = Record[0], Col = Record[1]; + unsigned ScopeID = Record[2], IAID = Record[3]; + + MDNode *Scope = 0, *IA = 0; + if (ScopeID) Scope = cast<MDNode>(MDValueList.getValueFwdRef(ScopeID-1)); + if (IAID) IA = cast<MDNode>(MDValueList.getValueFwdRef(IAID-1)); + LastLoc = DebugLoc::get(Line, Col, Scope, IA); + I->setDebugLoc(LastLoc); + I = 0; + continue; + } + + case bitc::FUNC_CODE_INST_BINOP: { // BINOP: [opval, ty, opval, opcode] + unsigned OpNum = 0; + Value *LHS, *RHS; + if (getValueTypePair(Record, OpNum, NextValueNo, LHS) || + getValue(Record, OpNum, LHS->getType(), RHS) || + OpNum+1 > Record.size()) + return Error("Invalid BINOP record"); + + int Opc = GetDecodedBinaryOpcode(Record[OpNum++], LHS->getType()); + if (Opc == -1) return Error("Invalid BINOP record"); + I = BinaryOperator::Create((Instruction::BinaryOps)Opc, LHS, RHS); + InstructionList.push_back(I); + if (OpNum < Record.size()) { + if (Opc == Instruction::Add || + Opc == Instruction::Sub || + Opc == Instruction::Mul || + Opc == Instruction::Shl) { + if (Record[OpNum] & (1 << bitc::OBO_NO_SIGNED_WRAP)) + cast<BinaryOperator>(I)->setHasNoSignedWrap(true); + if (Record[OpNum] & (1 << bitc::OBO_NO_UNSIGNED_WRAP)) + cast<BinaryOperator>(I)->setHasNoUnsignedWrap(true); + } else if (Opc == Instruction::SDiv || + Opc == Instruction::UDiv || + Opc == Instruction::LShr || + Opc == Instruction::AShr) { + if (Record[OpNum] & (1 << bitc::PEO_EXACT)) + cast<BinaryOperator>(I)->setIsExact(true); + } + } + break; + } + case bitc::FUNC_CODE_INST_CAST: { // CAST: [opval, opty, destty, castopc] + unsigned OpNum = 0; + Value *Op; + if (getValueTypePair(Record, OpNum, NextValueNo, Op) || + OpNum+2 != Record.size()) + return Error("Invalid CAST record"); + + Type *ResTy = getTypeByID(Record[OpNum]); + int Opc = GetDecodedCastOpcode(Record[OpNum+1]); + if (Opc == -1 || ResTy == 0) + return Error("Invalid CAST record"); + I = CastInst::Create((Instruction::CastOps)Opc, Op, ResTy); + InstructionList.push_back(I); + break; + } + case bitc::FUNC_CODE_INST_INBOUNDS_GEP: + case bitc::FUNC_CODE_INST_GEP: { // GEP: [n x operands] + unsigned OpNum = 0; + Value *BasePtr; + if (getValueTypePair(Record, OpNum, NextValueNo, BasePtr)) + return Error("Invalid GEP record"); + + SmallVector<Value*, 16> GEPIdx; + while (OpNum != Record.size()) { + Value *Op; + if (getValueTypePair(Record, OpNum, NextValueNo, Op)) + return Error("Invalid GEP record"); + GEPIdx.push_back(Op); + } + + I = GetElementPtrInst::Create(BasePtr, GEPIdx); + InstructionList.push_back(I); + if (BitCode == bitc::FUNC_CODE_INST_INBOUNDS_GEP) + cast<GetElementPtrInst>(I)->setIsInBounds(true); + break; + } + + case bitc::FUNC_CODE_INST_EXTRACTVAL: { + // EXTRACTVAL: [opty, opval, n x indices] + unsigned OpNum = 0; + Value *Agg; + if (getValueTypePair(Record, OpNum, NextValueNo, Agg)) + return Error("Invalid EXTRACTVAL record"); + + SmallVector<unsigned, 4> EXTRACTVALIdx; + for (unsigned RecSize = Record.size(); + OpNum != RecSize; ++OpNum) { + uint64_t Index = Record[OpNum]; + if ((unsigned)Index != Index) + return Error("Invalid EXTRACTVAL index"); + EXTRACTVALIdx.push_back((unsigned)Index); + } + + I = ExtractValueInst::Create(Agg, EXTRACTVALIdx); + InstructionList.push_back(I); + break; + } + + case bitc::FUNC_CODE_INST_INSERTVAL: { + // INSERTVAL: [opty, opval, opty, opval, n x indices] + unsigned OpNum = 0; + Value *Agg; + if (getValueTypePair(Record, OpNum, NextValueNo, Agg)) + return Error("Invalid INSERTVAL record"); + Value *Val; + if (getValueTypePair(Record, OpNum, NextValueNo, Val)) + return Error("Invalid INSERTVAL record"); + + SmallVector<unsigned, 4> INSERTVALIdx; + for (unsigned RecSize = Record.size(); + OpNum != RecSize; ++OpNum) { + uint64_t Index = Record[OpNum]; + if ((unsigned)Index != Index) + return Error("Invalid INSERTVAL index"); + INSERTVALIdx.push_back((unsigned)Index); + } + + I = InsertValueInst::Create(Agg, Val, INSERTVALIdx); + InstructionList.push_back(I); + break; + } + + case bitc::FUNC_CODE_INST_SELECT: { // SELECT: [opval, ty, opval, opval] + // obsolete form of select + // handles select i1 ... in old bitcode + unsigned OpNum = 0; + Value *TrueVal, *FalseVal, *Cond; + if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) || + getValue(Record, OpNum, TrueVal->getType(), FalseVal) || + getValue(Record, OpNum, Type::getInt1Ty(Context), Cond)) + return Error("Invalid SELECT record"); + + I = SelectInst::Create(Cond, TrueVal, FalseVal); + InstructionList.push_back(I); + break; + } + + case bitc::FUNC_CODE_INST_VSELECT: {// VSELECT: [ty,opval,opval,predty,pred] + // new form of select + // handles select i1 or select [N x i1] + unsigned OpNum = 0; + Value *TrueVal, *FalseVal, *Cond; + if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) || + getValue(Record, OpNum, TrueVal->getType(), FalseVal) || + getValueTypePair(Record, OpNum, NextValueNo, Cond)) + return Error("Invalid SELECT record"); + + // select condition can be either i1 or [N x i1] + if (VectorType* vector_type = + dyn_cast<VectorType>(Cond->getType())) { + // expect <n x i1> + if (vector_type->getElementType() != Type::getInt1Ty(Context)) + return Error("Invalid SELECT condition type"); + } else { + // expect i1 + if (Cond->getType() != Type::getInt1Ty(Context)) + return Error("Invalid SELECT condition type"); + } + + I = SelectInst::Create(Cond, TrueVal, FalseVal); + InstructionList.push_back(I); + break; + } + + case bitc::FUNC_CODE_INST_EXTRACTELT: { // EXTRACTELT: [opty, opval, opval] + unsigned OpNum = 0; + Value *Vec, *Idx; + if (getValueTypePair(Record, OpNum, NextValueNo, Vec) || + getValue(Record, OpNum, Type::getInt32Ty(Context), Idx)) + return Error("Invalid EXTRACTELT record"); + I = ExtractElementInst::Create(Vec, Idx); + InstructionList.push_back(I); + break; + } + + case bitc::FUNC_CODE_INST_INSERTELT: { // INSERTELT: [ty, opval,opval,opval] + unsigned OpNum = 0; + Value *Vec, *Elt, *Idx; + if (getValueTypePair(Record, OpNum, NextValueNo, Vec) || + getValue(Record, OpNum, + cast<VectorType>(Vec->getType())->getElementType(), Elt) || + getValue(Record, OpNum, Type::getInt32Ty(Context), Idx)) + return Error("Invalid INSERTELT record"); + I = InsertElementInst::Create(Vec, Elt, Idx); + InstructionList.push_back(I); + break; + } + + case bitc::FUNC_CODE_INST_SHUFFLEVEC: {// SHUFFLEVEC: [opval,ty,opval,opval] + unsigned OpNum = 0; + Value *Vec1, *Vec2, *Mask; + if (getValueTypePair(Record, OpNum, NextValueNo, Vec1) || + getValue(Record, OpNum, Vec1->getType(), Vec2)) + return Error("Invalid SHUFFLEVEC record"); + + if (getValueTypePair(Record, OpNum, NextValueNo, Mask)) + return Error("Invalid SHUFFLEVEC record"); + I = new ShuffleVectorInst(Vec1, Vec2, Mask); + InstructionList.push_back(I); + break; + } + + case bitc::FUNC_CODE_INST_CMP: // CMP: [opty, opval, opval, pred] + // Old form of ICmp/FCmp returning bool + // Existed to differentiate between icmp/fcmp and vicmp/vfcmp which were + // both legal on vectors but had different behaviour. + case bitc::FUNC_CODE_INST_CMP2: { // CMP2: [opty, opval, opval, pred] + // FCmp/ICmp returning bool or vector of bool + + unsigned OpNum = 0; + Value *LHS, *RHS; + if (getValueTypePair(Record, OpNum, NextValueNo, LHS) || + getValue(Record, OpNum, LHS->getType(), RHS) || + OpNum+1 != Record.size()) + return Error("Invalid CMP record"); + + if (LHS->getType()->isFPOrFPVectorTy()) + I = new FCmpInst((FCmpInst::Predicate)Record[OpNum], LHS, RHS); + else + I = new ICmpInst((ICmpInst::Predicate)Record[OpNum], LHS, RHS); + InstructionList.push_back(I); + break; + } + + case bitc::FUNC_CODE_INST_RET: // RET: [opty,opval<optional>] + { + unsigned Size = Record.size(); + if (Size == 0) { + I = ReturnInst::Create(Context); + InstructionList.push_back(I); + break; + } + + unsigned OpNum = 0; + Value *Op = NULL; + if (getValueTypePair(Record, OpNum, NextValueNo, Op)) + return Error("Invalid RET record"); + if (OpNum != Record.size()) + return Error("Invalid RET record"); + + I = ReturnInst::Create(Context, Op); + InstructionList.push_back(I); + break; + } + case bitc::FUNC_CODE_INST_BR: { // BR: [bb#, bb#, opval] or [bb#] + if (Record.size() != 1 && Record.size() != 3) + return Error("Invalid BR record"); + BasicBlock *TrueDest = getBasicBlock(Record[0]); + if (TrueDest == 0) + return Error("Invalid BR record"); + + if (Record.size() == 1) { + I = BranchInst::Create(TrueDest); + InstructionList.push_back(I); + } + else { + BasicBlock *FalseDest = getBasicBlock(Record[1]); + Value *Cond = getFnValueByID(Record[2], Type::getInt1Ty(Context)); + if (FalseDest == 0 || Cond == 0) + return Error("Invalid BR record"); + I = BranchInst::Create(TrueDest, FalseDest, Cond); + InstructionList.push_back(I); + } + break; + } + case bitc::FUNC_CODE_INST_SWITCH: { // SWITCH: [opty, op0, op1, ...] + if (Record.size() < 3 || (Record.size() & 1) == 0) + return Error("Invalid SWITCH record"); + Type *OpTy = getTypeByID(Record[0]); + Value *Cond = getFnValueByID(Record[1], OpTy); + BasicBlock *Default = getBasicBlock(Record[2]); + if (OpTy == 0 || Cond == 0 || Default == 0) + return Error("Invalid SWITCH record"); + unsigned NumCases = (Record.size()-3)/2; + SwitchInst *SI = SwitchInst::Create(Cond, Default, NumCases); + InstructionList.push_back(SI); + for (unsigned i = 0, e = NumCases; i != e; ++i) { + ConstantInt *CaseVal = + dyn_cast_or_null<ConstantInt>(getFnValueByID(Record[3+i*2], OpTy)); + BasicBlock *DestBB = getBasicBlock(Record[1+3+i*2]); + if (CaseVal == 0 || DestBB == 0) { + delete SI; + return Error("Invalid SWITCH record!"); + } + SI->addCase(CaseVal, DestBB); + } + I = SI; + break; + } + case bitc::FUNC_CODE_INST_INDIRECTBR: { // INDIRECTBR: [opty, op0, op1, ...] + if (Record.size() < 2) + return Error("Invalid INDIRECTBR record"); + Type *OpTy = getTypeByID(Record[0]); + Value *Address = getFnValueByID(Record[1], OpTy); + if (OpTy == 0 || Address == 0) + return Error("Invalid INDIRECTBR record"); + unsigned NumDests = Record.size()-2; + IndirectBrInst *IBI = IndirectBrInst::Create(Address, NumDests); + InstructionList.push_back(IBI); + for (unsigned i = 0, e = NumDests; i != e; ++i) { + if (BasicBlock *DestBB = getBasicBlock(Record[2+i])) { + IBI->addDestination(DestBB); + } else { + delete IBI; + return Error("Invalid INDIRECTBR record!"); + } + } + I = IBI; + break; + } + + case bitc::FUNC_CODE_INST_INVOKE: { + // INVOKE: [attrs, cc, normBB, unwindBB, fnty, op0,op1,op2, ...] + if (Record.size() < 4) return Error("Invalid INVOKE record"); + AttrListPtr PAL = getAttributes(Record[0]); + unsigned CCInfo = Record[1]; + BasicBlock *NormalBB = getBasicBlock(Record[2]); + BasicBlock *UnwindBB = getBasicBlock(Record[3]); + + unsigned OpNum = 4; + Value *Callee; + if (getValueTypePair(Record, OpNum, NextValueNo, Callee)) + return Error("Invalid INVOKE record"); + + PointerType *CalleeTy = dyn_cast<PointerType>(Callee->getType()); + FunctionType *FTy = !CalleeTy ? 0 : + dyn_cast<FunctionType>(CalleeTy->getElementType()); + + // Check that the right number of fixed parameters are here. + if (FTy == 0 || NormalBB == 0 || UnwindBB == 0 || + Record.size() < OpNum+FTy->getNumParams()) + return Error("Invalid INVOKE record"); + + SmallVector<Value*, 16> Ops; + for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) { + Ops.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i))); + if (Ops.back() == 0) return Error("Invalid INVOKE record"); + } + + if (!FTy->isVarArg()) { + if (Record.size() != OpNum) + return Error("Invalid INVOKE record"); + } else { + // Read type/value pairs for varargs params. + while (OpNum != Record.size()) { + Value *Op; + if (getValueTypePair(Record, OpNum, NextValueNo, Op)) + return Error("Invalid INVOKE record"); + Ops.push_back(Op); + } + } + + I = InvokeInst::Create(Callee, NormalBB, UnwindBB, Ops); + InstructionList.push_back(I); + cast<InvokeInst>(I)->setCallingConv( + static_cast<CallingConv::ID>(CCInfo)); + cast<InvokeInst>(I)->setAttributes(PAL); + break; + } + case bitc::FUNC_CODE_INST_RESUME: { // RESUME: [opval] + unsigned Idx = 0; + Value *Val = 0; + if (getValueTypePair(Record, Idx, NextValueNo, Val)) + return Error("Invalid RESUME record"); + I = ResumeInst::Create(Val); + InstructionList.push_back(I); + break; + } + case bitc::FUNC_CODE_INST_UNWIND: // UNWIND + I = new UnwindInst(Context); + InstructionList.push_back(I); + break; + case bitc::FUNC_CODE_INST_UNREACHABLE: // UNREACHABLE + I = new UnreachableInst(Context); + InstructionList.push_back(I); + break; + case bitc::FUNC_CODE_INST_PHI: { // PHI: [ty, val0,bb0, ...] + if (Record.size() < 1 || ((Record.size()-1)&1)) + return Error("Invalid PHI record"); + Type *Ty = getTypeByID(Record[0]); + if (!Ty) return Error("Invalid PHI record"); + + PHINode *PN = PHINode::Create(Ty, (Record.size()-1)/2); + InstructionList.push_back(PN); + + for (unsigned i = 0, e = Record.size()-1; i != e; i += 2) { + Value *V = getFnValueByID(Record[1+i], Ty); + BasicBlock *BB = getBasicBlock(Record[2+i]); + if (!V || !BB) return Error("Invalid PHI record"); + PN->addIncoming(V, BB); + } + I = PN; + break; + } + + case bitc::FUNC_CODE_INST_LANDINGPAD: { + // LANDINGPAD: [ty, val, val, num, (id0,val0 ...)?] + unsigned Idx = 0; + if (Record.size() < 4) + return Error("Invalid LANDINGPAD record"); + Type *Ty = getTypeByID(Record[Idx++]); + if (!Ty) return Error("Invalid LANDINGPAD record"); + Value *PersFn = 0; + if (getValueTypePair(Record, Idx, NextValueNo, PersFn)) + return Error("Invalid LANDINGPAD record"); + + bool IsCleanup = !!Record[Idx++]; + unsigned NumClauses = Record[Idx++]; + LandingPadInst *LP = LandingPadInst::Create(Ty, PersFn, NumClauses); + LP->setCleanup(IsCleanup); + for (unsigned J = 0; J != NumClauses; ++J) { + LandingPadInst::ClauseType CT = + LandingPadInst::ClauseType(Record[Idx++]); (void)CT; + Value *Val; + + if (getValueTypePair(Record, Idx, NextValueNo, Val)) { + delete LP; + return Error("Invalid LANDINGPAD record"); + } + + assert((CT != LandingPadInst::Catch || + !isa<ArrayType>(Val->getType())) && + "Catch clause has a invalid type!"); + assert((CT != LandingPadInst::Filter || + isa<ArrayType>(Val->getType())) && + "Filter clause has invalid type!"); + LP->addClause(Val); + } + + I = LP; + InstructionList.push_back(I); + break; + } + + case bitc::FUNC_CODE_INST_ALLOCA: { // ALLOCA: [instty, opty, op, align] + if (Record.size() != 4) + return Error("Invalid ALLOCA record"); + PointerType *Ty = + dyn_cast_or_null<PointerType>(getTypeByID(Record[0])); + Type *OpTy = getTypeByID(Record[1]); + Value *Size = getFnValueByID(Record[2], OpTy); + unsigned Align = Record[3]; + if (!Ty || !Size) return Error("Invalid ALLOCA record"); + I = new AllocaInst(Ty->getElementType(), Size, (1 << Align) >> 1); + InstructionList.push_back(I); + break; + } + case bitc::FUNC_CODE_INST_LOAD: { // LOAD: [opty, op, align, vol] + unsigned OpNum = 0; + Value *Op; + if (getValueTypePair(Record, OpNum, NextValueNo, Op) || + OpNum+2 != Record.size()) + return Error("Invalid LOAD record"); + + I = new LoadInst(Op, "", Record[OpNum+1], (1 << Record[OpNum]) >> 1); + InstructionList.push_back(I); + break; + } + case bitc::FUNC_CODE_INST_LOADATOMIC: { + // LOADATOMIC: [opty, op, align, vol, ordering, synchscope] + unsigned OpNum = 0; + Value *Op; + if (getValueTypePair(Record, OpNum, NextValueNo, Op) || + OpNum+4 != Record.size()) + return Error("Invalid LOADATOMIC record"); + + + AtomicOrdering Ordering = GetDecodedOrdering(Record[OpNum+2]); + if (Ordering == NotAtomic || Ordering == Release || + Ordering == AcquireRelease) + return Error("Invalid LOADATOMIC record"); + if (Ordering != NotAtomic && Record[OpNum] == 0) + return Error("Invalid LOADATOMIC record"); + SynchronizationScope SynchScope = GetDecodedSynchScope(Record[OpNum+3]); + + I = new LoadInst(Op, "", Record[OpNum+1], (1 << Record[OpNum]) >> 1, + Ordering, SynchScope); + InstructionList.push_back(I); + break; + } + case bitc::FUNC_CODE_INST_STORE: { // STORE2:[ptrty, ptr, val, align, vol] + unsigned OpNum = 0; + Value *Val, *Ptr; + if (getValueTypePair(Record, OpNum, NextValueNo, Ptr) || + getValue(Record, OpNum, + cast<PointerType>(Ptr->getType())->getElementType(), Val) || + OpNum+2 != Record.size()) + return Error("Invalid STORE record"); + + I = new StoreInst(Val, Ptr, Record[OpNum+1], (1 << Record[OpNum]) >> 1); + InstructionList.push_back(I); + break; + } + case bitc::FUNC_CODE_INST_STOREATOMIC: { + // STOREATOMIC: [ptrty, ptr, val, align, vol, ordering, synchscope] + unsigned OpNum = 0; + Value *Val, *Ptr; + if (getValueTypePair(Record, OpNum, NextValueNo, Ptr) || + getValue(Record, OpNum, + cast<PointerType>(Ptr->getType())->getElementType(), Val) || + OpNum+4 != Record.size()) + return Error("Invalid STOREATOMIC record"); + + AtomicOrdering Ordering = GetDecodedOrdering(Record[OpNum+2]); + if (Ordering == NotAtomic || Ordering == Acquire || + Ordering == AcquireRelease) + return Error("Invalid STOREATOMIC record"); + SynchronizationScope SynchScope = GetDecodedSynchScope(Record[OpNum+3]); + if (Ordering != NotAtomic && Record[OpNum] == 0) + return Error("Invalid STOREATOMIC record"); + + I = new StoreInst(Val, Ptr, Record[OpNum+1], (1 << Record[OpNum]) >> 1, + Ordering, SynchScope); + InstructionList.push_back(I); + break; + } + case bitc::FUNC_CODE_INST_CMPXCHG: { + // CMPXCHG:[ptrty, ptr, cmp, new, vol, ordering, synchscope] + unsigned OpNum = 0; + Value *Ptr, *Cmp, *New; + if (getValueTypePair(Record, OpNum, NextValueNo, Ptr) || + getValue(Record, OpNum, + cast<PointerType>(Ptr->getType())->getElementType(), Cmp) || + getValue(Record, OpNum, + cast<PointerType>(Ptr->getType())->getElementType(), New) || + OpNum+3 != Record.size()) + return Error("Invalid CMPXCHG record"); + AtomicOrdering Ordering = GetDecodedOrdering(Record[OpNum+1]); + if (Ordering == NotAtomic || Ordering == Unordered) + return Error("Invalid CMPXCHG record"); + SynchronizationScope SynchScope = GetDecodedSynchScope(Record[OpNum+2]); + I = new AtomicCmpXchgInst(Ptr, Cmp, New, Ordering, SynchScope); + cast<AtomicCmpXchgInst>(I)->setVolatile(Record[OpNum]); + InstructionList.push_back(I); + break; + } + case bitc::FUNC_CODE_INST_ATOMICRMW: { + // ATOMICRMW:[ptrty, ptr, val, op, vol, ordering, synchscope] + unsigned OpNum = 0; + Value *Ptr, *Val; + if (getValueTypePair(Record, OpNum, NextValueNo, Ptr) || + getValue(Record, OpNum, + cast<PointerType>(Ptr->getType())->getElementType(), Val) || + OpNum+4 != Record.size()) + return Error("Invalid ATOMICRMW record"); + AtomicRMWInst::BinOp Operation = GetDecodedRMWOperation(Record[OpNum]); + if (Operation < AtomicRMWInst::FIRST_BINOP || + Operation > AtomicRMWInst::LAST_BINOP) + return Error("Invalid ATOMICRMW record"); + AtomicOrdering Ordering = GetDecodedOrdering(Record[OpNum+2]); + if (Ordering == NotAtomic || Ordering == Unordered) + return Error("Invalid ATOMICRMW record"); + SynchronizationScope SynchScope = GetDecodedSynchScope(Record[OpNum+3]); + I = new AtomicRMWInst(Operation, Ptr, Val, Ordering, SynchScope); + cast<AtomicRMWInst>(I)->setVolatile(Record[OpNum+1]); + InstructionList.push_back(I); + break; + } + case bitc::FUNC_CODE_INST_FENCE: { // FENCE:[ordering, synchscope] + if (2 != Record.size()) + return Error("Invalid FENCE record"); + AtomicOrdering Ordering = GetDecodedOrdering(Record[0]); + if (Ordering == NotAtomic || Ordering == Unordered || + Ordering == Monotonic) + return Error("Invalid FENCE record"); + SynchronizationScope SynchScope = GetDecodedSynchScope(Record[1]); + I = new FenceInst(Context, Ordering, SynchScope); + InstructionList.push_back(I); + break; + } + case bitc::FUNC_CODE_INST_CALL: { + // CALL: [paramattrs, cc, fnty, fnid, arg0, arg1...] + if (Record.size() < 3) + return Error("Invalid CALL record"); + + AttrListPtr PAL = getAttributes(Record[0]); + unsigned CCInfo = Record[1]; + + unsigned OpNum = 2; + Value *Callee; + if (getValueTypePair(Record, OpNum, NextValueNo, Callee)) + return Error("Invalid CALL record"); + + PointerType *OpTy = dyn_cast<PointerType>(Callee->getType()); + FunctionType *FTy = 0; + if (OpTy) FTy = dyn_cast<FunctionType>(OpTy->getElementType()); + if (!FTy || Record.size() < FTy->getNumParams()+OpNum) + return Error("Invalid CALL record"); + + SmallVector<Value*, 16> Args; + // Read the fixed params. + for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) { + if (FTy->getParamType(i)->isLabelTy()) + Args.push_back(getBasicBlock(Record[OpNum])); + else + Args.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i))); + if (Args.back() == 0) return Error("Invalid CALL record"); + } + + // Read type/value pairs for varargs params. + if (!FTy->isVarArg()) { + if (OpNum != Record.size()) + return Error("Invalid CALL record"); + } else { + while (OpNum != Record.size()) { + Value *Op; + if (getValueTypePair(Record, OpNum, NextValueNo, Op)) + return Error("Invalid CALL record"); + Args.push_back(Op); + } + } + + I = CallInst::Create(Callee, Args); + InstructionList.push_back(I); + cast<CallInst>(I)->setCallingConv( + static_cast<CallingConv::ID>(CCInfo>>1)); + cast<CallInst>(I)->setTailCall(CCInfo & 1); + cast<CallInst>(I)->setAttributes(PAL); + break; + } + case bitc::FUNC_CODE_INST_VAARG: { // VAARG: [valistty, valist, instty] + if (Record.size() < 3) + return Error("Invalid VAARG record"); + Type *OpTy = getTypeByID(Record[0]); + Value *Op = getFnValueByID(Record[1], OpTy); + Type *ResTy = getTypeByID(Record[2]); + if (!OpTy || !Op || !ResTy) + return Error("Invalid VAARG record"); + I = new VAArgInst(Op, ResTy); + InstructionList.push_back(I); + break; + } + } + + // Add instruction to end of current BB. If there is no current BB, reject + // this file. + if (CurBB == 0) { + delete I; + return Error("Invalid instruction with no BB"); + } + CurBB->getInstList().push_back(I); + + // If this was a terminator instruction, move to the next block. + if (isa<TerminatorInst>(I)) { + ++CurBBNo; + CurBB = CurBBNo < FunctionBBs.size() ? FunctionBBs[CurBBNo] : 0; + } + + // Non-void values get registered in the value table for future use. + if (I && !I->getType()->isVoidTy()) + ValueList.AssignValue(I, NextValueNo++); + } + + // Check the function list for unresolved values. + if (Argument *A = dyn_cast<Argument>(ValueList.back())) { + if (A->getParent() == 0) { + // We found at least one unresolved value. Nuke them all to avoid leaks. + for (unsigned i = ModuleValueListSize, e = ValueList.size(); i != e; ++i){ + if ((A = dyn_cast<Argument>(ValueList[i])) && A->getParent() == 0) { + A->replaceAllUsesWith(UndefValue::get(A->getType())); + delete A; + } + } + return Error("Never resolved value found in function!"); + } + } + + // FIXME: Check for unresolved forward-declared metadata references + // and clean up leaks. + + // See if anything took the address of blocks in this function. If so, + // resolve them now. + DenseMap<Function*, std::vector<BlockAddrRefTy> >::iterator BAFRI = + BlockAddrFwdRefs.find(F); + if (BAFRI != BlockAddrFwdRefs.end()) { + std::vector<BlockAddrRefTy> &RefList = BAFRI->second; + for (unsigned i = 0, e = RefList.size(); i != e; ++i) { + unsigned BlockIdx = RefList[i].first; + if (BlockIdx >= FunctionBBs.size()) + return Error("Invalid blockaddress block #"); + + GlobalVariable *FwdRef = RefList[i].second; + FwdRef->replaceAllUsesWith(BlockAddress::get(F, FunctionBBs[BlockIdx])); + FwdRef->eraseFromParent(); + } + + BlockAddrFwdRefs.erase(BAFRI); + } + + // Trim the value list down to the size it was before we parsed this function. + ValueList.shrinkTo(ModuleValueListSize); + MDValueList.shrinkTo(ModuleMDValueListSize); + std::vector<BasicBlock*>().swap(FunctionBBs); + return false; +} + +//===----------------------------------------------------------------------===// +// GVMaterializer implementation +//===----------------------------------------------------------------------===// + + +bool BitcodeReader::isMaterializable(const GlobalValue *GV) const { + if (const Function *F = dyn_cast<Function>(GV)) { + return F->isDeclaration() && + DeferredFunctionInfo.count(const_cast<Function*>(F)); + } + return false; +} + +bool BitcodeReader::Materialize(GlobalValue *GV, std::string *ErrInfo) { + Function *F = dyn_cast<Function>(GV); + // If it's not a function or is already material, ignore the request. + if (!F || !F->isMaterializable()) return false; + + DenseMap<Function*, uint64_t>::iterator DFII = DeferredFunctionInfo.find(F); + assert(DFII != DeferredFunctionInfo.end() && "Deferred function not found!"); + + // Move the bit stream to the saved position of the deferred function body. + Stream.JumpToBit(DFII->second); + + if (ParseFunctionBody(F)) { + if (ErrInfo) *ErrInfo = ErrorString; + return true; + } + + // Upgrade any old intrinsic calls in the function. + for (UpgradedIntrinsicMap::iterator I = UpgradedIntrinsics.begin(), + E = UpgradedIntrinsics.end(); I != E; ++I) { + if (I->first != I->second) { + for (Value::use_iterator UI = I->first->use_begin(), + UE = I->first->use_end(); UI != UE; ) { + if (CallInst* CI = dyn_cast<CallInst>(*UI++)) + UpgradeIntrinsicCall(CI, I->second); + } + } + } + + return false; +} + +bool BitcodeReader::isDematerializable(const GlobalValue *GV) const { + const Function *F = dyn_cast<Function>(GV); + if (!F || F->isDeclaration()) + return false; + return DeferredFunctionInfo.count(const_cast<Function*>(F)); +} + +void BitcodeReader::Dematerialize(GlobalValue *GV) { + Function *F = dyn_cast<Function>(GV); + // If this function isn't dematerializable, this is a noop. + if (!F || !isDematerializable(F)) + return; + + assert(DeferredFunctionInfo.count(F) && "No info to read function later?"); + + // Just forget the function body, we can remat it later. + F->deleteBody(); +} + + +bool BitcodeReader::MaterializeModule(Module *M, std::string *ErrInfo) { + assert(M == TheModule && + "Can only Materialize the Module this BitcodeReader is attached to."); + // Iterate over the module, deserializing any functions that are still on + // disk. + for (Module::iterator F = TheModule->begin(), E = TheModule->end(); + F != E; ++F) + if (F->isMaterializable() && + Materialize(F, ErrInfo)) + return true; + + // Upgrade any intrinsic calls that slipped through (should not happen!) and + // delete the old functions to clean up. We can't do this unless the entire + // module is materialized because there could always be another function body + // with calls to the old function. + for (std::vector<std::pair<Function*, Function*> >::iterator I = + UpgradedIntrinsics.begin(), E = UpgradedIntrinsics.end(); I != E; ++I) { + if (I->first != I->second) { + for (Value::use_iterator UI = I->first->use_begin(), + UE = I->first->use_end(); UI != UE; ) { + if (CallInst* CI = dyn_cast<CallInst>(*UI++)) + UpgradeIntrinsicCall(CI, I->second); + } + if (!I->first->use_empty()) + I->first->replaceAllUsesWith(I->second); + I->first->eraseFromParent(); + } + } + std::vector<std::pair<Function*, Function*> >().swap(UpgradedIntrinsics); + + // Upgrade to new EH scheme. N.B. This will go away in 3.1. + UpgradeExceptionHandling(M); + + // Check debug info intrinsics. + CheckDebugInfoIntrinsics(TheModule); + + return false; +} + + +//===----------------------------------------------------------------------===// +// External interface +//===----------------------------------------------------------------------===// + +/// getLazyBitcodeModule - lazy function-at-a-time loading from a file. +/// +Module *llvm::getLazyBitcodeModule(MemoryBuffer *Buffer, + LLVMContext& Context, + std::string *ErrMsg) { + Module *M = new Module(Buffer->getBufferIdentifier(), Context); + BitcodeReader *R = new BitcodeReader(Buffer, Context); + M->setMaterializer(R); + if (R->ParseBitcodeInto(M)) { + if (ErrMsg) + *ErrMsg = R->getErrorString(); + + delete M; // Also deletes R. + return 0; + } + // Have the BitcodeReader dtor delete 'Buffer'. + R->setBufferOwned(true); + return M; +} + +/// ParseBitcodeFile - Read the specified bitcode file, returning the module. +/// If an error occurs, return null and fill in *ErrMsg if non-null. +Module *llvm::ParseBitcodeFile(MemoryBuffer *Buffer, LLVMContext& Context, + std::string *ErrMsg){ + Module *M = getLazyBitcodeModule(Buffer, Context, ErrMsg); + if (!M) return 0; + + // Don't let the BitcodeReader dtor delete 'Buffer', regardless of whether + // there was an error. + static_cast<BitcodeReader*>(M->getMaterializer())->setBufferOwned(false); + + // Read in the entire module, and destroy the BitcodeReader. + if (M->MaterializeAllPermanently(ErrMsg)) { + delete M; + return 0; + } + + return M; +} + +std::string llvm::getBitcodeTargetTriple(MemoryBuffer *Buffer, + LLVMContext& Context, + std::string *ErrMsg) { + BitcodeReader *R = new BitcodeReader(Buffer, Context); + // Don't let the BitcodeReader dtor delete 'Buffer'. + R->setBufferOwned(false); + + std::string Triple(""); + if (R->ParseTriple(Triple)) + if (ErrMsg) + *ErrMsg = R->getErrorString(); + + delete R; + return Triple; +} diff --git a/contrib/llvm/lib/Bitcode/Reader/BitcodeReader.h b/contrib/llvm/lib/Bitcode/Reader/BitcodeReader.h new file mode 100644 index 0000000..6e6118c --- /dev/null +++ b/contrib/llvm/lib/Bitcode/Reader/BitcodeReader.h @@ -0,0 +1,278 @@ +//===- BitcodeReader.h - Internal BitcodeReader impl ------------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This header defines the BitcodeReader class. +// +//===----------------------------------------------------------------------===// + +#ifndef BITCODE_READER_H +#define BITCODE_READER_H + +#include "llvm/GVMaterializer.h" +#include "llvm/Attributes.h" +#include "llvm/Type.h" +#include "llvm/OperandTraits.h" +#include "llvm/Bitcode/BitstreamReader.h" +#include "llvm/Bitcode/LLVMBitCodes.h" +#include "llvm/Support/ValueHandle.h" +#include "llvm/ADT/DenseMap.h" +#include <vector> + +namespace llvm { + class MemoryBuffer; + class LLVMContext; + +//===----------------------------------------------------------------------===// +// BitcodeReaderValueList Class +//===----------------------------------------------------------------------===// + +class BitcodeReaderValueList { + std::vector<WeakVH> ValuePtrs; + + /// ResolveConstants - As we resolve forward-referenced constants, we add + /// information about them to this vector. This allows us to resolve them in + /// bulk instead of resolving each reference at a time. See the code in + /// ResolveConstantForwardRefs for more information about this. + /// + /// The key of this vector is the placeholder constant, the value is the slot + /// number that holds the resolved value. + typedef std::vector<std::pair<Constant*, unsigned> > ResolveConstantsTy; + ResolveConstantsTy ResolveConstants; + LLVMContext &Context; +public: + BitcodeReaderValueList(LLVMContext &C) : Context(C) {} + ~BitcodeReaderValueList() { + assert(ResolveConstants.empty() && "Constants not resolved?"); + } + + // vector compatibility methods + unsigned size() const { return ValuePtrs.size(); } + void resize(unsigned N) { ValuePtrs.resize(N); } + void push_back(Value *V) { + ValuePtrs.push_back(V); + } + + void clear() { + assert(ResolveConstants.empty() && "Constants not resolved?"); + ValuePtrs.clear(); + } + + Value *operator[](unsigned i) const { + assert(i < ValuePtrs.size()); + return ValuePtrs[i]; + } + + Value *back() const { return ValuePtrs.back(); } + void pop_back() { ValuePtrs.pop_back(); } + bool empty() const { return ValuePtrs.empty(); } + void shrinkTo(unsigned N) { + assert(N <= size() && "Invalid shrinkTo request!"); + ValuePtrs.resize(N); + } + + Constant *getConstantFwdRef(unsigned Idx, Type *Ty); + Value *getValueFwdRef(unsigned Idx, Type *Ty); + + void AssignValue(Value *V, unsigned Idx); + + /// ResolveConstantForwardRefs - Once all constants are read, this method bulk + /// resolves any forward references. + void ResolveConstantForwardRefs(); +}; + + +//===----------------------------------------------------------------------===// +// BitcodeReaderMDValueList Class +//===----------------------------------------------------------------------===// + +class BitcodeReaderMDValueList { + std::vector<WeakVH> MDValuePtrs; + + LLVMContext &Context; +public: + BitcodeReaderMDValueList(LLVMContext& C) : Context(C) {} + + // vector compatibility methods + unsigned size() const { return MDValuePtrs.size(); } + void resize(unsigned N) { MDValuePtrs.resize(N); } + void push_back(Value *V) { MDValuePtrs.push_back(V); } + void clear() { MDValuePtrs.clear(); } + Value *back() const { return MDValuePtrs.back(); } + void pop_back() { MDValuePtrs.pop_back(); } + bool empty() const { return MDValuePtrs.empty(); } + + Value *operator[](unsigned i) const { + assert(i < MDValuePtrs.size()); + return MDValuePtrs[i]; + } + + void shrinkTo(unsigned N) { + assert(N <= size() && "Invalid shrinkTo request!"); + MDValuePtrs.resize(N); + } + + Value *getValueFwdRef(unsigned Idx); + void AssignValue(Value *V, unsigned Idx); +}; + +class BitcodeReader : public GVMaterializer { + LLVMContext &Context; + Module *TheModule; + MemoryBuffer *Buffer; + bool BufferOwned; + BitstreamReader StreamFile; + BitstreamCursor Stream; + + const char *ErrorString; + + std::vector<Type*> TypeList; + BitcodeReaderValueList ValueList; + BitcodeReaderMDValueList MDValueList; + SmallVector<Instruction *, 64> InstructionList; + + std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInits; + std::vector<std::pair<GlobalAlias*, unsigned> > AliasInits; + + /// MAttributes - The set of attributes by index. Index zero in the + /// file is for null, and is thus not represented here. As such all indices + /// are off by one. + std::vector<AttrListPtr> MAttributes; + + /// FunctionBBs - While parsing a function body, this is a list of the basic + /// blocks for the function. + std::vector<BasicBlock*> FunctionBBs; + + // When reading the module header, this list is populated with functions that + // have bodies later in the file. + std::vector<Function*> FunctionsWithBodies; + + // When intrinsic functions are encountered which require upgrading they are + // stored here with their replacement function. + typedef std::vector<std::pair<Function*, Function*> > UpgradedIntrinsicMap; + UpgradedIntrinsicMap UpgradedIntrinsics; + + // Map the bitcode's custom MDKind ID to the Module's MDKind ID. + DenseMap<unsigned, unsigned> MDKindMap; + + // After the module header has been read, the FunctionsWithBodies list is + // reversed. This keeps track of whether we've done this yet. + bool HasReversedFunctionsWithBodies; + + /// DeferredFunctionInfo - When function bodies are initially scanned, this + /// map contains info about where to find deferred function body in the + /// stream. + DenseMap<Function*, uint64_t> DeferredFunctionInfo; + + /// BlockAddrFwdRefs - These are blockaddr references to basic blocks. These + /// are resolved lazily when functions are loaded. + typedef std::pair<unsigned, GlobalVariable*> BlockAddrRefTy; + DenseMap<Function*, std::vector<BlockAddrRefTy> > BlockAddrFwdRefs; + +public: + explicit BitcodeReader(MemoryBuffer *buffer, LLVMContext &C) + : Context(C), TheModule(0), Buffer(buffer), BufferOwned(false), + ErrorString(0), ValueList(C), MDValueList(C) { + HasReversedFunctionsWithBodies = false; + } + ~BitcodeReader() { + FreeState(); + } + + void FreeState(); + + /// setBufferOwned - If this is true, the reader will destroy the MemoryBuffer + /// when the reader is destroyed. + void setBufferOwned(bool Owned) { BufferOwned = Owned; } + + virtual bool isMaterializable(const GlobalValue *GV) const; + virtual bool isDematerializable(const GlobalValue *GV) const; + virtual bool Materialize(GlobalValue *GV, std::string *ErrInfo = 0); + virtual bool MaterializeModule(Module *M, std::string *ErrInfo = 0); + virtual void Dematerialize(GlobalValue *GV); + + bool Error(const char *Str) { + ErrorString = Str; + return true; + } + const char *getErrorString() const { return ErrorString; } + + /// @brief Main interface to parsing a bitcode buffer. + /// @returns true if an error occurred. + bool ParseBitcodeInto(Module *M); + + /// @brief Cheap mechanism to just extract module triple + /// @returns true if an error occurred. + bool ParseTriple(std::string &Triple); +private: + Type *getTypeByID(unsigned ID); + Type *getTypeByIDOrNull(unsigned ID); + Value *getFnValueByID(unsigned ID, Type *Ty) { + if (Ty && Ty->isMetadataTy()) + return MDValueList.getValueFwdRef(ID); + return ValueList.getValueFwdRef(ID, Ty); + } + BasicBlock *getBasicBlock(unsigned ID) const { + if (ID >= FunctionBBs.size()) return 0; // Invalid ID + return FunctionBBs[ID]; + } + AttrListPtr getAttributes(unsigned i) const { + if (i-1 < MAttributes.size()) + return MAttributes[i-1]; + return AttrListPtr(); + } + + /// getValueTypePair - Read a value/type pair out of the specified record from + /// slot 'Slot'. Increment Slot past the number of slots used in the record. + /// Return true on failure. + bool getValueTypePair(SmallVector<uint64_t, 64> &Record, unsigned &Slot, + unsigned InstNum, Value *&ResVal) { + if (Slot == Record.size()) return true; + unsigned ValNo = (unsigned)Record[Slot++]; + if (ValNo < InstNum) { + // If this is not a forward reference, just return the value we already + // have. + ResVal = getFnValueByID(ValNo, 0); + return ResVal == 0; + } else if (Slot == Record.size()) { + return true; + } + + unsigned TypeNo = (unsigned)Record[Slot++]; + ResVal = getFnValueByID(ValNo, getTypeByID(TypeNo)); + return ResVal == 0; + } + bool getValue(SmallVector<uint64_t, 64> &Record, unsigned &Slot, + Type *Ty, Value *&ResVal) { + if (Slot == Record.size()) return true; + unsigned ValNo = (unsigned)Record[Slot++]; + ResVal = getFnValueByID(ValNo, Ty); + return ResVal == 0; + } + + + bool ParseModule(); + bool ParseAttributeBlock(); + bool ParseTypeTable(); + bool ParseOldTypeTable(); // FIXME: Remove in LLVM 3.1 + bool ParseTypeTableBody(); + + bool ParseOldTypeSymbolTable(); // FIXME: Remove in LLVM 3.1 + bool ParseValueSymbolTable(); + bool ParseConstants(); + bool RememberAndSkipFunctionBody(); + bool ParseFunctionBody(Function *F); + bool ResolveGlobalAndAliasInits(); + bool ParseMetadata(); + bool ParseMetadataAttachment(); + bool ParseModuleTriple(std::string &Triple); +}; + +} // End llvm namespace + +#endif |
