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c453f76e2b
anything about disk I/O itself. This greatly simplifies its interface - eliminating the need for the ReaderWrappers.cpp file. This adds a new option to llvm-dis (-bitcode) which instructs it to read the input file as bitcode. Until/unless the bytecode reader is taught to read from MemoryBuffer, there is no way to handle stdin reading without it. I don't plan to switch the bytecode reader over, I'd rather delete it :), so the option will stay around temporarily. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36554 91177308-0d34-0410-b5e6-96231b3b80d8
115 lines
3.3 KiB
C++
115 lines
3.3 KiB
C++
//===- BitcodeReader.h - Internal BitcodeReader impl ------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Chris Lattner and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This header defines the BitcodeReader class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef BITCODE_READER_H
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#define BITCODE_READER_H
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#include "llvm/ModuleProvider.h"
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#include "llvm/Type.h"
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#include "llvm/User.h"
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#include "llvm/Bitcode/LLVMBitCodes.h"
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#include <vector>
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namespace llvm {
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class BitstreamReader;
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class MemoryBuffer;
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class BitcodeReaderValueList : public User {
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std::vector<Use> Uses;
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public:
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BitcodeReaderValueList() : User(Type::VoidTy, Value::ArgumentVal, 0, 0) {}
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// vector compatibility methods
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unsigned size() const { return getNumOperands(); }
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void push_back(Value *V) {
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Uses.push_back(Use(V, this));
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OperandList = &Uses[0];
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++NumOperands;
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}
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Value *operator[](unsigned i) const { return getOperand(i); }
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Value *back() const { return Uses.back(); }
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void pop_back() { Uses.pop_back(); --NumOperands; }
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bool empty() const { return NumOperands == 0; }
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void shrinkTo(unsigned N) {
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assert(N < NumOperands && "Invalid shrinkTo request!");
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Uses.resize(N);
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NumOperands = N;
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}
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virtual void print(std::ostream&) const {}
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Constant *getConstantFwdRef(unsigned Idx, const Type *Ty);
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void initVal(unsigned Idx, Value *V) {
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assert(Uses[Idx] == 0 && "Cannot init an already init'd Use!");
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Uses[Idx].init(V, this);
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}
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};
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class BitcodeReader : public ModuleProvider {
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MemoryBuffer *Buffer;
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const char *ErrorString;
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std::vector<PATypeHolder> TypeList;
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BitcodeReaderValueList ValueList;
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std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInits;
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std::vector<std::pair<GlobalAlias*, unsigned> > AliasInits;
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public:
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BitcodeReader(MemoryBuffer *buffer) : Buffer(buffer), ErrorString(0) {}
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~BitcodeReader();
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/// releaseMemoryBuffer - This causes the reader to completely forget about
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/// the memory buffer it contains, which prevents the buffer from being
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/// destroyed when it is deleted.
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void releaseMemoryBuffer() {
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Buffer = 0;
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}
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virtual bool materializeFunction(Function *F, std::string *ErrInfo = 0) {
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// FIXME: TODO
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return false;
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}
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virtual Module *materializeModule(std::string *ErrInfo = 0) {
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// FIXME: TODO
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//if (ParseAllFunctionBodies(ErrMsg))
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// return 0;
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return TheModule;
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}
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bool Error(const char *Str) {
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ErrorString = Str;
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return true;
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}
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const char *getErrorString() const { return ErrorString; }
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/// @brief Main interface to parsing a bitcode buffer.
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/// @returns true if an error occurred.
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bool ParseBitcode();
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private:
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const Type *getTypeByID(unsigned ID, bool isTypeTable = false);
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bool ParseModule(BitstreamReader &Stream, const std::string &ModuleID);
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bool ParseTypeTable(BitstreamReader &Stream);
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bool ParseTypeSymbolTable(BitstreamReader &Stream);
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bool ParseValueSymbolTable(BitstreamReader &Stream);
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bool ParseConstants(BitstreamReader &Stream);
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bool ResolveGlobalAndAliasInits();
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};
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} // End llvm namespace
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#endif
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