| //===-- WriterInternals.h - Data structures shared by the Writer -*- C++ -*--=// |
| // |
| // This header defines the interface used between components of the bytecode |
| // writer. |
| // |
| // Note that the performance of this library is not terribly important, because |
| // it shouldn't be used by JIT type applications... so it is not a huge focus |
| // at least. :) |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_LIB_BYTECODE_WRITER_WRITERINTERNALS_H |
| #define LLVM_LIB_BYTECODE_WRITER_WRITERINTERNALS_H |
| |
| #include "llvm/Bytecode/Writer.h" |
| #include "llvm/Bytecode/Format.h" |
| #include "llvm/Bytecode/Primitives.h" |
| #include "llvm/Analysis/SlotCalculator.h" |
| #include "llvm/Tools/DataTypes.h" |
| #include "llvm/Instruction.h" |
| |
| class BytecodeWriter : public ModuleAnalyzer { |
| vector<unsigned char> &Out; |
| SlotCalculator Table; |
| public: |
| BytecodeWriter(vector<unsigned char> &o, const Module *M); |
| |
| protected: |
| virtual bool processConstPool(const ConstantPool &CP, bool isMethod); |
| virtual bool processMethod(const Method *M); |
| virtual bool processBasicBlock(const BasicBlock *BB); |
| virtual bool processInstruction(const Instruction *I); |
| |
| private : |
| inline void outputSignature() { |
| static const unsigned char *Sig = (const unsigned char*)"llvm"; |
| Out.insert(Out.end(), Sig, Sig+4); // output the bytecode signature... |
| } |
| |
| void outputModuleInfoBlock(const Module *C); |
| void outputSymbolTable(const SymbolTable &ST); |
| bool outputConstant(const ConstPoolVal *CPV); |
| void outputType(const Type *T); |
| }; |
| |
| |
| |
| |
| // BytecodeBlock - Little helper class that helps us do backpatching of bytecode |
| // block sizes really easily. It backpatches when it goes out of scope. |
| // |
| class BytecodeBlock { |
| unsigned Loc; |
| vector<unsigned char> &Out; |
| |
| BytecodeBlock(const BytecodeBlock &); // do not implement |
| void operator=(const BytecodeBlock &); // do not implement |
| public: |
| inline BytecodeBlock(unsigned ID, vector<unsigned char> &o) : Out(o) { |
| output(ID, Out); |
| output((unsigned)0, Out); // Reserve the space for the block size... |
| Loc = Out.size(); |
| } |
| |
| inline ~BytecodeBlock() { // Do backpatch when block goes out |
| // of scope... |
| // cerr << "OldLoc = " << Loc << " NewLoc = " << NewLoc << " diff = " << (NewLoc-Loc) << endl; |
| output((unsigned)(Out.size()-Loc), Out, (int)Loc-4); |
| align32(Out); // Blocks must ALWAYS be aligned |
| } |
| }; |
| |
| |
| #endif |