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//===- BitcodeReader.h - Internal BitcodeReader impl ------------*- C++ -*-===//
//
// 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.
//
//===----------------------------------------------------------------------===//
#ifndef BITCODE_READER_H
#define BITCODE_READER_H
#include "llvm/ModuleProvider.h"
#include "llvm/Type.h"
#include "llvm/User.h"
#include "llvm/Bitcode/BitstreamReader.h"
#include "llvm/Bitcode/LLVMBitCodes.h"
#include "llvm/ADT/DenseMap.h"
#include <vector>
namespace llvm {
class MemoryBuffer;
class BitcodeReaderValueList : public User {
std::vector<Use> Uses;
public:
BitcodeReaderValueList() : User(Type::VoidTy, Value::ArgumentVal, 0, 0) {}
// vector compatibility methods
unsigned size() const { return getNumOperands(); }
void push_back(Value *V) {
Uses.push_back(Use(V, this));
OperandList = &Uses[0];
++NumOperands;
}
Value *operator[](unsigned i) const { return getOperand(i); }
Value *back() const { return Uses.back(); }
void pop_back() { Uses.pop_back(); --NumOperands; }
bool empty() const { return NumOperands == 0; }
void shrinkTo(unsigned N) {
assert(N <= NumOperands && "Invalid shrinkTo request!");
Uses.resize(N);
NumOperands = N;
}
virtual void print(std::ostream&) const {}
Constant *getConstantFwdRef(unsigned Idx, const Type *Ty);
Value *getValueFwdRef(unsigned Idx, const Type *Ty);
void AssignValue(Value *V, unsigned Idx) {
if (Idx == size()) {
push_back(V);
} else if (Value *OldV = getOperand(Idx)) {
// If there was a forward reference to this value, replace it.
setOperand(Idx, V);
OldV->replaceAllUsesWith(V);
delete OldV;
} else {
initVal(Idx, V);
}
}
private:
void initVal(unsigned Idx, Value *V) {
assert(Uses[Idx] == 0 && "Cannot init an already init'd Use!");
Uses[Idx].init(V, this);
}
};
class BitcodeReader : public ModuleProvider {
MemoryBuffer *Buffer;
BitstreamReader Stream;
const char *ErrorString;
std::vector<PATypeHolder> TypeList;
BitcodeReaderValueList ValueList;
std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInits;
std::vector<std::pair<GlobalAlias*, unsigned> > AliasInits;
/// 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;
// 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) and what linkage the original function had.
DenseMap<Function*, std::pair<uint64_t, unsigned> > DeferredFunctionInfo;
public:
BitcodeReader(MemoryBuffer *buffer) : Buffer(buffer), ErrorString(0) {
HasReversedFunctionsWithBodies = false;
}
~BitcodeReader();
/// releaseMemoryBuffer - This causes the reader to completely forget about
/// the memory buffer it contains, which prevents the buffer from being
/// destroyed when it is deleted.
void releaseMemoryBuffer() {
Buffer = 0;
}
virtual bool materializeFunction(Function *F, std::string *ErrInfo = 0);
virtual Module *materializeModule(std::string *ErrInfo = 0);
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 ParseBitcode();
private:
const Type *getTypeByID(unsigned ID, bool isTypeTable = false);
Value *getFnValueByID(unsigned ID, const Type *Ty) {
return ValueList.getValueFwdRef(ID, Ty);
}
bool ParseModule(const std::string &ModuleID);
bool ParseTypeTable();
bool ParseTypeSymbolTable();
bool ParseValueSymbolTable();
bool ParseConstants();
bool RememberAndSkipFunctionBody();
bool ParseFunctionBody(Function *F);
bool ResolveGlobalAndAliasInits();
};
} // End llvm namespace
#endif
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