#ifndef BITCODE_READER_H
#define BITCODE_READER_H
#include "llvm/ModuleProvider.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 BitcodeReaderValueList {
std::vector<WeakVH> ValuePtrs;
typedef std::vector<std::pair<Constant*, unsigned> > ResolveConstantsTy;
ResolveConstantsTy ResolveConstants;
public:
BitcodeReaderValueList() {}
~BitcodeReaderValueList() {
assert(ResolveConstants.empty() && "Constants not resolved?");
}
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, const Type *Ty);
Value *getValueFwdRef(unsigned Idx, const Type *Ty);
void AssignValue(Value *V, unsigned Idx);
void ResolveConstantForwardRefs();
};
class BitcodeReader : public ModuleProvider {
MemoryBuffer *Buffer;
BitstreamReader StreamFile;
BitstreamCursor Stream;
const char *ErrorString;
std::vector<PATypeHolder> TypeList;
BitcodeReaderValueList ValueList;
std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInits;
std::vector<std::pair<GlobalAlias*, unsigned> > AliasInits;
std::vector<AttrListPtr> MAttributes;
std::vector<BasicBlock*> FunctionBBs;
std::vector<Function*> FunctionsWithBodies;
typedef std::vector<std::pair<Function*, Function*> > UpgradedIntrinsicMap;
UpgradedIntrinsicMap UpgradedIntrinsics;
bool HasReversedFunctionsWithBodies;
DenseMap<Function*, std::pair<uint64_t, unsigned> > DeferredFunctionInfo;
public:
explicit BitcodeReader(MemoryBuffer *buffer)
: Buffer(buffer), ErrorString(0) {
HasReversedFunctionsWithBodies = false;
}
~BitcodeReader() {
FreeState();
}
void FreeState();
void releaseMemoryBuffer() {
Buffer = 0;
}
virtual bool materializeFunction(Function *F, std::string *ErrInfo = 0);
virtual Module *materializeModule(std::string *ErrInfo = 0);
virtual void dematerializeFunction(Function *F);
virtual Module *releaseModule(std::string *ErrInfo = 0);
bool Error(const char *Str) {
ErrorString = Str;
return true;
}
const char *getErrorString() const { return ErrorString; }
bool ParseBitcode();
private:
const Type *getTypeByID(unsigned ID, bool isTypeTable = false);
Value *getFnValueByID(unsigned ID, const Type *Ty) {
return ValueList.getValueFwdRef(ID, Ty);
}
BasicBlock *getBasicBlock(unsigned ID) const {
if (ID >= FunctionBBs.size()) return 0; return FunctionBBs[ID];
}
AttrListPtr getAttributes(unsigned i) const {
if (i-1 < MAttributes.size())
return MAttributes[i-1];
return AttrListPtr();
}
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) {
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,
const Type *Ty, Value *&ResVal) {
if (Slot == Record.size()) return true;
unsigned ValNo = (unsigned)Record[Slot++];
ResVal = getFnValueByID(ValNo, Ty);
return ResVal == 0;
}
bool ParseModule(const std::string &ModuleID);
bool ParseAttributeBlock();
bool ParseTypeTable();
bool ParseTypeSymbolTable();
bool ParseValueSymbolTable();
bool ParseConstants();
bool RememberAndSkipFunctionBody();
bool ParseFunctionBody(Function *F);
bool ResolveGlobalAndAliasInits();
};
}
#endif