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llvm-6502/lib/Bitcode/Reader/BitcodeReader.cpp
Chris Lattner a9bb713130 Make a preemptive bitcode format change to support PR1146. This lets us do 
pr1146 in llvm 2.1 without ugly code to emulate old behavior.  This should
be merged into the 2.0 release branch.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36928 91177308-0d34-0410-b5e6-96231b3b80d8
2007-05-08 05:38:01 +00:00

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//===- BitcodeReader.cpp - Internal BitcodeReader implementation ----------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and 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/Instructions.h"
#include "llvm/Module.h"
#include "llvm/ParameterAttributes.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/MemoryBuffer.h"
using namespace llvm;
BitcodeReader::~BitcodeReader() {
delete Buffer;
}
//===----------------------------------------------------------------------===//
// 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::WeakLinkage;
case 2: return GlobalValue::AppendingLinkage;
case 3: return GlobalValue::InternalLinkage;
case 4: return GlobalValue::LinkOnceLinkage;
case 5: return GlobalValue::DLLImportLinkage;
case 6: return GlobalValue::DLLExportLinkage;
case 7: return GlobalValue::ExternalWeakLinkage;
}
}
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, const Type *Ty) {
switch (Val) {
default: return -1;
case bitc::BINOP_ADD: return Instruction::Add;
case bitc::BINOP_SUB: return Instruction::Sub;
case bitc::BINOP_MUL: return Instruction::Mul;
case bitc::BINOP_UDIV: return Instruction::UDiv;
case bitc::BINOP_SDIV:
return Ty->isFPOrFPVector() ? Instruction::FDiv : Instruction::SDiv;
case bitc::BINOP_UREM: return Instruction::URem;
case bitc::BINOP_SREM:
return Ty->isFPOrFPVector() ? 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;
}
}
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 {
ConstantPlaceHolder(); // DO NOT IMPLEMENT
void operator=(const ConstantPlaceHolder &); // DO NOT IMPLEMENT
public:
Use Op;
ConstantPlaceHolder(const Type *Ty)
: ConstantExpr(Ty, Instruction::UserOp1, &Op, 1),
Op(UndefValue::get(Type::Int32Ty), this) {
}
};
}
Constant *BitcodeReaderValueList::getConstantFwdRef(unsigned Idx,
const Type *Ty) {
if (Idx >= size()) {
// Insert a bunch of null values.
Uses.resize(Idx+1);
OperandList = &Uses[0];
NumOperands = Idx+1;
}
if (Value *V = Uses[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);
Uses[Idx].init(C, this);
return C;
}
Value *BitcodeReaderValueList::getValueFwdRef(unsigned Idx, const Type *Ty) {
if (Idx >= size()) {
// Insert a bunch of null values.
Uses.resize(Idx+1);
OperandList = &Uses[0];
NumOperands = Idx+1;
}
if (Value *V = Uses[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);
Uses[Idx].init(V, this);
return V;
}
const Type *BitcodeReader::getTypeByID(unsigned ID, bool isTypeTable) {
// If the TypeID is in range, return it.
if (ID < TypeList.size())
return TypeList[ID].get();
if (!isTypeTable) return 0;
// The type table allows forward references. Push as many Opaque types as
// needed to get up to ID.
while (TypeList.size() <= ID)
TypeList.push_back(OpaqueType::get());
return TypeList.back().get();
}
//===----------------------------------------------------------------------===//
// Functions for parsing blocks from the bitcode file
//===----------------------------------------------------------------------===//
bool BitcodeReader::ParseParamAttrBlock() {
if (Stream.EnterSubBlock(bitc::PARAMATTR_BLOCK_ID))
return Error("Malformed block record");
if (!ParamAttrs.empty())
return Error("Multiple PARAMATTR blocks found!");
SmallVector<uint64_t, 64> Record;
ParamAttrsVector 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");
ParamAttrsWithIndex PAWI;
for (unsigned i = 0, e = Record.size(); i != e; i += 2) {
PAWI.index = Record[i];
PAWI.attrs = Record[i+1];
Attrs.push_back(PAWI);
}
ParamAttrs.push_back(ParamAttrsList::get(Attrs));
Attrs.clear();
break;
}
}
}
}
bool BitcodeReader::ParseTypeTable() {
if (Stream.EnterSubBlock(bitc::TYPE_BLOCK_ID))
return Error("Malformed block record");
if (!TypeList.empty())
return Error("Multiple TYPE_BLOCKs found!");
SmallVector<uint64_t, 64> Record;
unsigned NumRecords = 0;
// 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();
const Type *ResultTy = 0;
switch (Stream.ReadRecord(Code, Record)) {
default: // Default behavior: unknown type.
ResultTy = 0;
break;
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.reserve(Record[0]);
continue;
case bitc::TYPE_CODE_VOID: // VOID
ResultTy = Type::VoidTy;
break;
case bitc::TYPE_CODE_FLOAT: // FLOAT
ResultTy = Type::FloatTy;
break;
case bitc::TYPE_CODE_DOUBLE: // DOUBLE
ResultTy = Type::DoubleTy;
break;
case bitc::TYPE_CODE_LABEL: // LABEL
ResultTy = Type::LabelTy;
break;
case bitc::TYPE_CODE_OPAQUE: // OPAQUE
ResultTy = 0;
break;
case bitc::TYPE_CODE_INTEGER: // INTEGER: [width]
if (Record.size() < 1)
return Error("Invalid Integer type record");
ResultTy = IntegerType::get(Record[0]);
break;
case bitc::TYPE_CODE_POINTER: // POINTER: [pointee type]
if (Record.size() < 1)
return Error("Invalid POINTER type record");
ResultTy = PointerType::get(getTypeByID(Record[0], true));
break;
case bitc::TYPE_CODE_FUNCTION: {
// FUNCTION: [vararg, attrid, retty, paramty x N]
if (Record.size() < 3)
return Error("Invalid FUNCTION type record");
std::vector<const Type*> ArgTys;
for (unsigned i = 3, e = Record.size(); i != e; ++i)
ArgTys.push_back(getTypeByID(Record[i], true));
ResultTy = FunctionType::get(getTypeByID(Record[2], true), ArgTys,
Record[0], getParamAttrs(Record[1]));
break;
}
case bitc::TYPE_CODE_STRUCT: { // STRUCT: [ispacked, eltty x N]
if (Record.size() < 1)
return Error("Invalid STRUCT type record");
std::vector<const Type*> EltTys;
for (unsigned i = 1, e = Record.size(); i != e; ++i)
EltTys.push_back(getTypeByID(Record[i], true));
ResultTy = StructType::get(EltTys, Record[0]);
break;
}
case bitc::TYPE_CODE_ARRAY: // ARRAY: [numelts, eltty]
if (Record.size() < 2)
return Error("Invalid ARRAY type record");
ResultTy = ArrayType::get(getTypeByID(Record[1], true), Record[0]);
break;
case bitc::TYPE_CODE_VECTOR: // VECTOR: [numelts, eltty]
if (Record.size() < 2)
return Error("Invalid VECTOR type record");
ResultTy = VectorType::get(getTypeByID(Record[1], true), Record[0]);
break;
}
if (NumRecords == TypeList.size()) {
// If this is a new type slot, just append it.
TypeList.push_back(ResultTy ? ResultTy : OpaqueType::get());
++NumRecords;
} else if (ResultTy == 0) {
// Otherwise, this was forward referenced, so an opaque type was created,
// but the result type is actually just an opaque. Leave the one we
// created previously.
++NumRecords;
} else {
// Otherwise, this was forward referenced, so an opaque type was created.
// Resolve the opaque type to the real type now.
assert(NumRecords < TypeList.size() && "Typelist imbalance");
const OpaqueType *OldTy = cast<OpaqueType>(TypeList[NumRecords++].get());
// Don't directly push the new type on the Tab. Instead we want to replace
// the opaque type we previously inserted with the new concrete value. The
// refinement from the abstract (opaque) type to the new type causes all
// uses of the abstract type to use the concrete type (NewTy). This will
// also cause the opaque type to be deleted.
const_cast<OpaqueType*>(OldTy)->refineAbstractTypeTo(ResultTy);
// This should have replaced the old opaque type with the new type in the
// value table... or with a preexisting type that was already in the
// system. Let's just make sure it did.
assert(TypeList[NumRecords-1].get() != OldTy &&
"refineAbstractType didn't work!");
}
}
}
bool BitcodeReader::ParseTypeSymbolTable() {
if (Stream.EnterSubBlock(bitc::TYPE_SYMTAB_BLOCK_ID))
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");
TheModule->addTypeName(TypeName, TypeList[TypeID].get());
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 TST_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(&ValueName[0], 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(&ValueName[0], ValueName.size());
ValueName.clear();
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.
const Type *CurTy = Type::Int32Ty;
unsigned NextCstNo = ValueList.size();
while (1) {
unsigned Code = Stream.ReadCode();
if (Code == bitc::END_BLOCK) {
if (NextCstNo != ValueList.size())
return Error("Invalid constant reference!");
if (Stream.ReadBlockEnd())
return Error("Error at end of constants 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();
Value *V = 0;
switch (Stream.ReadRecord(Code, Record)) {
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 (!isa<IntegerType>(CurTy) || 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 (!isa<IntegerType>(CurTy) || 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(APInt(cast<IntegerType>(CurTy)->getBitWidth(),
NumWords, &Words[0]));
break;
}
case bitc::CST_CODE_FLOAT: // FLOAT: [fpval]
if (Record.empty())
return Error("Invalid FLOAT record");
if (CurTy == Type::FloatTy)
V = ConstantFP::get(CurTy, BitsToFloat(Record[0]));
else if (CurTy == Type::DoubleTy)
V = ConstantFP::get(CurTy, BitsToDouble(Record[0]));
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 (const 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 (const ArrayType *ATy = dyn_cast<ArrayType>(CurTy)) {
const 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 (const VectorType *VTy = dyn_cast<VectorType>(CurTy)) {
const 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");
const ArrayType *ATy = cast<ArrayType>(CurTy);
const 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");
const ArrayType *ATy = cast<ArrayType>(CurTy);
const 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);
V = ConstantExpr::get(Opc, LHS, RHS);
}
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 {
const 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_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) {
const Type *ElTy = getTypeByID(Record[i]);
if (!ElTy) return Error("Invalid CE_GEP record");
Elts.push_back(ValueList.getConstantFwdRef(Record[i+1], ElTy));
}
V = ConstantExpr::getGetElementPtr(Elts[0], &Elts[1], Elts.size()-1);
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::Int1Ty),
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");
const 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],
OpTy->getElementType());
V = ConstantExpr::getExtractElement(Op0, Op1);
break;
}
case bitc::CST_CODE_CE_INSERTELT: { // CE_INSERTELT: [opval, opval, opval]
const 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::Int32Ty);
V = ConstantExpr::getInsertElement(Op0, Op1, Op2);
break;
}
case bitc::CST_CODE_CE_SHUFFLEVEC: { // CE_SHUFFLEVEC: [opval, opval, opval]
const 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);
const Type *ShufTy=VectorType::get(Type::Int32Ty, OpTy->getNumElements());
Constant *Op2 = ValueList.getConstantFwdRef(Record[2], 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");
const 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->isFloatingPoint())
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];
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];
const PointerType *PTy = cast<PointerType>(CurTy);
V = InlineAsm::get(cast<FunctionType>(PTy->getElementType()),
AsmStr, ConstrStr, HasSideEffects);
break;
}
}
ValueList.AssignValue(V, NextCstNo);
++NextCstNo;
}
}
/// 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] = std::make_pair(CurBit, Fn->getLinkage());
// Set the functions linkage to GhostLinkage so we know it is lazily
// deserialized.
Fn->setLinkage(GlobalValue::GhostLinkage);
// Skip over the function block for now.
if (Stream.SkipBlock())
return Error("Malformed block record");
return false;
}
bool BitcodeReader::ParseModule(const std::string &ModuleID) {
// Reject multiple MODULE_BLOCK's in a single bitstream.
if (TheModule)
return Error("Multiple MODULE_BLOCKs in same stream");
if (Stream.EnterSubBlock(bitc::MODULE_BLOCK_ID))
return Error("Malformed block record");
// Otherwise, create the module.
TheModule = new Module(ModuleID);
SmallVector<uint64_t, 64> Record;
std::vector<std::string> SectionTable;
// 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");
// 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 (ParseParamAttrBlock())
return true;
break;
case bitc::TYPE_BLOCK_ID:
if (ParseTypeTable())
return true;
break;
case bitc::TYPE_SYMTAB_BLOCK_ID:
if (ParseTypeSymbolTable())
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::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;
}
// GLOBALVAR: [type, isconst, initid,
// linkage, alignment, section, visibility, threadlocal]
case bitc::MODULE_CODE_GLOBALVAR: {
if (Record.size() < 6)
return Error("Invalid MODULE_CODE_GLOBALVAR record");
const Type *Ty = getTypeByID(Record[0]);
if (!isa<PointerType>(Ty))
return Error("Global not a pointer type!");
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];
GlobalVariable *NewGV =
new GlobalVariable(Ty, isConstant, Linkage, 0, "", TheModule);
NewGV->setAlignment(Alignment);
if (!Section.empty())
NewGV->setSection(Section);
NewGV->setVisibility(Visibility);
NewGV->setThreadLocal(isThreadLocal);
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]
case bitc::MODULE_CODE_FUNCTION: {
if (Record.size() < 8)
return Error("Invalid MODULE_CODE_FUNCTION record");
const Type *Ty = getTypeByID(Record[0]);
if (!isa<PointerType>(Ty))
return Error("Function not a pointer type!");
const FunctionType *FTy =
dyn_cast<FunctionType>(cast<PointerType>(Ty)->getElementType());
if (!FTy)
return Error("Function not a pointer to function type!");
Function *Func = new Function(FTy, GlobalValue::ExternalLinkage,
"", TheModule);
Func->setCallingConv(Record[1]);
bool isProto = Record[2];
Func->setLinkage(GetDecodedLinkage(Record[3]));
assert(Func->getFunctionType()->getParamAttrs() ==
getParamAttrs(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]));
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]
case bitc::MODULE_CODE_ALIAS: {
if (Record.size() < 3)
return Error("Invalid MODULE_ALIAS record");
const Type *Ty = getTypeByID(Record[0]);
if (!isa<PointerType>(Ty))
return Error("Function not a pointer type!");
GlobalAlias *NewGA = new GlobalAlias(Ty, GetDecodedLinkage(Record[2]),
"", 0, TheModule);
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::ParseBitcode() {
TheModule = 0;
if (Buffer->getBufferSize() & 3)
return Error("Bitcode stream should be a multiple of 4 bytes in length");
unsigned char *BufPtr = (unsigned char *)Buffer->getBufferStart();
Stream.init(BufPtr, BufPtr+Buffer->getBufferSize());
// 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::BLOCKINFO_BLOCK_ID:
if (Stream.ReadBlockInfoBlock())
return Error("Malformed BlockInfoBlock");
break;
case bitc::MODULE_BLOCK_ID:
if (ParseModule(Buffer->getBufferIdentifier()))
return true;
break;
default:
if (Stream.SkipBlock())
return Error("Malformed block record");
break;
}
}
return false;
}
bool BitcodeReader::materializeFunction(Function *F, std::string *ErrInfo) {
// If it already is material, ignore the request.
if (!F->hasNotBeenReadFromBytecode()) return false;
DenseMap<Function*, std::pair<uint64_t, unsigned> >::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 and
// restore the real linkage type for the function.
Stream.JumpToBit(DFII->second.first);
F->setLinkage((GlobalValue::LinkageTypes)DFII->second.second);
DeferredFunctionInfo.erase(DFII);
if (ParseFunctionBody(F)) {
if (ErrInfo) *ErrInfo = ErrorString;
return true;
}
return false;
}
Module *BitcodeReader::materializeModule(std::string *ErrInfo) {
DenseMap<Function*, std::pair<uint64_t, unsigned> >::iterator I =
DeferredFunctionInfo.begin();
while (!DeferredFunctionInfo.empty()) {
Function *F = (*I++).first;
assert(F->hasNotBeenReadFromBytecode() &&
"Deserialized function found in map!");
if (materializeFunction(F, ErrInfo))
return 0;
}
return TheModule;
}
/// 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");
unsigned ModuleValueListSize = ValueList.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;
// 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;
}
continue;
}
if (Code == bitc::DEFINE_ABBREV) {
Stream.ReadAbbrevRecord();
continue;
}
// Read a record.
Record.clear();
Instruction *I = 0;
switch (Stream.ReadRecord(Code, Record)) {
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] = new BasicBlock("", F);
CurBB = FunctionBBs[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);
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");
const 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);
break;
}
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 = new GetElementPtrInst(BasePtr, &GEPIdx[0], GEPIdx.size());
break;
}
case bitc::FUNC_CODE_INST_SELECT: { // SELECT: [opval, ty, opval, opval]
unsigned OpNum = 0;
Value *TrueVal, *FalseVal, *Cond;
if (getValueTypePair(Record, OpNum, NextValueNo, TrueVal) ||
getValue(Record, OpNum, TrueVal->getType(), FalseVal) ||
getValue(Record, OpNum, Type::Int1Ty, Cond))
return Error("Invalid SELECT record");
I = new SelectInst(Cond, TrueVal, FalseVal);
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::Int32Ty, Idx))
return Error("Invalid EXTRACTELT record");
I = new ExtractElementInst(Vec, Idx);
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::Int32Ty, Idx))
return Error("Invalid INSERTELT record");
I = new InsertElementInst(Vec, Elt, Idx);
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");
const Type *MaskTy =
VectorType::get(Type::Int32Ty,
cast<VectorType>(Vec1->getType())->getNumElements());
if (getValue(Record, OpNum, MaskTy, Mask))
return Error("Invalid SHUFFLEVEC record");
I = new ShuffleVectorInst(Vec1, Vec2, Mask);
break;
}
case bitc::FUNC_CODE_INST_CMP: { // CMP: [opty, opval, opval, pred]
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()->isFPOrFPVector())
I = new FCmpInst((FCmpInst::Predicate)Record[OpNum], LHS, RHS);
else
I = new ICmpInst((ICmpInst::Predicate)Record[OpNum], LHS, RHS);
break;
}
case bitc::FUNC_CODE_INST_RET: // RET: [opty,opval<optional>]
if (Record.size() == 0) {
I = new ReturnInst();
break;
} else {
unsigned OpNum = 0;
Value *Op;
if (getValueTypePair(Record, OpNum, NextValueNo, Op) ||
OpNum != Record.size())
return Error("Invalid RET record");
I = new ReturnInst(Op);
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 = new BranchInst(TrueDest);
else {
BasicBlock *FalseDest = getBasicBlock(Record[1]);
Value *Cond = getFnValueByID(Record[2], Type::Int1Ty);
if (FalseDest == 0 || Cond == 0)
return Error("Invalid BR record");
I = new BranchInst(TrueDest, FalseDest, Cond);
}
break;
}
case bitc::FUNC_CODE_INST_SWITCH: { // SWITCH: [opty, opval, n, n x ops]
if (Record.size() < 3 || (Record.size() & 1) == 0)
return Error("Invalid SWITCH record");
const 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 = new SwitchInst(Cond, Default, NumCases);
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_INVOKE: { // INVOKE: [cc,fnty, op0,op1,op2, ...]
if (Record.size() < 4) return Error("Invalid INVOKE record");
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");
const PointerType *CalleeTy = dyn_cast<PointerType>(Callee->getType());
const 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");
assert(FTy->getParamAttrs() == getParamAttrs(Record[0]));
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 = new InvokeInst(Callee, NormalBB, UnwindBB, &Ops[0], Ops.size());
cast<InvokeInst>(I)->setCallingConv(CCInfo);
break;
}
case bitc::FUNC_CODE_INST_UNWIND: // UNWIND
I = new UnwindInst();
break;
case bitc::FUNC_CODE_INST_UNREACHABLE: // UNREACHABLE
I = new UnreachableInst();
break;
case bitc::FUNC_CODE_INST_PHI: { // PHI: [ty, val0,bb0, ...]
if (Record.size() < 1 || ((Record.size()-1)&1))
return Error("Invalid PHI record");
const Type *Ty = getTypeByID(Record[0]);
if (!Ty) return Error("Invalid PHI record");
PHINode *PN = new PHINode(Ty);
PN->reserveOperandSpace(Record.size()-1);
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_MALLOC: { // MALLOC: [instty, op, align]
if (Record.size() < 3)
return Error("Invalid MALLOC record");
const PointerType *Ty =
dyn_cast_or_null<PointerType>(getTypeByID(Record[0]));
Value *Size = getFnValueByID(Record[1], Type::Int32Ty);
unsigned Align = Record[2];
if (!Ty || !Size) return Error("Invalid MALLOC record");
I = new MallocInst(Ty->getElementType(), Size, (1 << Align) >> 1);
break;
}
case bitc::FUNC_CODE_INST_FREE: { // FREE: [op, opty]
unsigned OpNum = 0;
Value *Op;
if (getValueTypePair(Record, OpNum, NextValueNo, Op) ||
OpNum != Record.size())
return Error("Invalid FREE record");
I = new FreeInst(Op);
break;
}
case bitc::FUNC_CODE_INST_ALLOCA: { // ALLOCA: [instty, op, align]
if (Record.size() < 3)
return Error("Invalid ALLOCA record");
const PointerType *Ty =
dyn_cast_or_null<PointerType>(getTypeByID(Record[0]));
Value *Size = getFnValueByID(Record[1], Type::Int32Ty);
unsigned Align = Record[2];
if (!Ty || !Size) return Error("Invalid ALLOCA record");
I = new AllocaInst(Ty->getElementType(), Size, (1 << Align) >> 1);
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);
break;
}
case bitc::FUNC_CODE_INST_STORE: { // STORE:[val, valty, ptr, align, vol]
unsigned OpNum = 0;
Value *Val, *Ptr;
if (getValueTypePair(Record, OpNum, NextValueNo, Val) ||
getValue(Record, OpNum, PointerType::get(Val->getType()), Ptr) ||
OpNum+2 != Record.size())
return Error("Invalid STORE record");
I = new StoreInst(Val, Ptr, Record[OpNum+1], (1 << Record[OpNum]) >> 1);
break;
}
case bitc::FUNC_CODE_INST_CALL: { // CALL: [cc, fnty, fnid, arg0, arg1...]
if (Record.size() < 2)
return Error("Invalid CALL record");
unsigned CCInfo = Record[1];
unsigned OpNum = 2;
Value *Callee;
if (getValueTypePair(Record, OpNum, NextValueNo, Callee))
return Error("Invalid CALL record");
const PointerType *OpTy = dyn_cast<PointerType>(Callee->getType());
const FunctionType *FTy = 0;
if (OpTy) FTy = dyn_cast<FunctionType>(OpTy->getElementType());
if (!FTy || Record.size() < FTy->getNumParams()+OpNum)
return Error("Invalid CALL record");
assert(FTy->getParamAttrs() == getParamAttrs(Record[0]));
SmallVector<Value*, 16> Args;
// Read the fixed params.
for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) {
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 = new CallInst(Callee, &Args[0], Args.size());
cast<CallInst>(I)->setCallingConv(CCInfo>>1);
cast<CallInst>(I)->setTailCall(CCInfo & 1);
break;
}
case bitc::FUNC_CODE_INST_VAARG: { // VAARG: [valistty, valist, instty]
if (Record.size() < 3)
return Error("Invalid VAARG record");
const Type *OpTy = getTypeByID(Record[0]);
Value *Op = getFnValueByID(Record[1], OpTy);
const Type *ResTy = getTypeByID(Record[2]);
if (!OpTy || !Op || !ResTy)
return Error("Invalid VAARG record");
I = new VAArgInst(Op, ResTy);
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() != Type::VoidTy)
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.back())) && A->getParent() == 0) {
A->replaceAllUsesWith(UndefValue::get(A->getType()));
delete A;
}
}
return Error("Never resolved value found in function!");
}
}
// Trim the value list down to the size it was before we parsed this function.
ValueList.shrinkTo(ModuleValueListSize);
std::vector<BasicBlock*>().swap(FunctionBBs);
return false;
}
//===----------------------------------------------------------------------===//
// External interface
//===----------------------------------------------------------------------===//
/// getBitcodeModuleProvider - lazy function-at-a-time loading from a file.
///
ModuleProvider *llvm::getBitcodeModuleProvider(MemoryBuffer *Buffer,
std::string *ErrMsg) {
BitcodeReader *R = new BitcodeReader(Buffer);
if (R->ParseBitcode()) {
if (ErrMsg)
*ErrMsg = R->getErrorString();
// Don't let the BitcodeReader dtor delete 'Buffer'.
R->releaseMemoryBuffer();
delete R;
return 0;
}
return R;
}
/// 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, std::string *ErrMsg){
BitcodeReader *R;
R = static_cast<BitcodeReader*>(getBitcodeModuleProvider(Buffer, ErrMsg));
if (!R) return 0;
// Read the whole module, get a pointer to it, tell ModuleProvider not to
// delete it when its dtor is run.
Module *M = R->releaseModule(ErrMsg);
// Don't let the BitcodeReader dtor delete 'Buffer'.
R->releaseMemoryBuffer();
delete R;
return M;
}
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