1 //===- BitcodeReader.h - Internal BitcodeReader impl ------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Chris Lattner and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This header defines the BitcodeReader class.
12 //===----------------------------------------------------------------------===//
14 #ifndef BITCODE_READER_H
15 #define BITCODE_READER_H
17 #include "llvm/ModuleProvider.h"
18 #include "llvm/Type.h"
19 #include "llvm/User.h"
20 #include "llvm/Bitcode/LLVMBitCodes.h"
24 class BitstreamReader;
26 class BitcodeReaderValueList : public User {
27 std::vector<Use> Uses;
29 BitcodeReaderValueList() : User(Type::VoidTy, Value::ArgumentVal, 0, 0) {}
31 // vector compatibility methods
32 unsigned size() const { return getNumOperands(); }
33 void push_back(Value *V) {
34 Uses.push_back(Use(V, this));
35 OperandList = &Uses[0];
39 Value *operator[](unsigned i) const { return getOperand(i); }
41 Value *back() const { return Uses.back(); }
42 void pop_back() { Uses.pop_back(); --NumOperands; }
43 bool empty() const { return NumOperands == 0; }
44 void shrinkTo(unsigned N) {
45 assert(N < NumOperands && "Invalid shrinkTo request!");
49 virtual void print(std::ostream&) const {}
51 Constant *getConstantFwdRef(unsigned Idx, const Type *Ty);
52 void initVal(unsigned Idx, Value *V) {
53 assert(Uses[Idx] == 0 && "Cannot init an already init'd Use!");
54 Uses[Idx].init(V, this);
59 class BitcodeReader : public ModuleProvider {
60 const char *ErrorString;
62 std::vector<PATypeHolder> TypeList;
63 BitcodeReaderValueList ValueList;
64 std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInits;
65 std::vector<std::pair<GlobalAlias*, unsigned> > AliasInits;
67 BitcodeReader() : ErrorString(0) {}
68 virtual ~BitcodeReader() {}
70 virtual void FreeState() {}
72 virtual bool materializeFunction(Function *F, std::string *ErrInfo = 0) {
77 virtual Module *materializeModule(std::string *ErrInfo = 0) {
79 //if (ParseAllFunctionBodies(ErrMsg))
84 bool Error(const char *Str) {
88 const char *getErrorString() const { return ErrorString; }
90 /// @brief Main interface to parsing a bitcode buffer.
91 /// @returns true if an error occurred.
92 bool ParseBitcode(unsigned char *Buf, unsigned Length,
93 const std::string &ModuleID);
95 const Type *getTypeByID(unsigned ID, bool isTypeTable = false);
97 bool ParseModule(BitstreamReader &Stream, const std::string &ModuleID);
98 bool ParseTypeTable(BitstreamReader &Stream);
99 bool ParseTypeSymbolTable(BitstreamReader &Stream);
100 bool ParseValueSymbolTable(BitstreamReader &Stream);
101 bool ParseConstants(BitstreamReader &Stream);
102 bool ResolveGlobalAndAliasInits();
105 } // End llvm namespace