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Diffstat (limited to 'lib/Bytecode/Writer/WriterInternals.h')
-rw-r--r-- | lib/Bytecode/Writer/WriterInternals.h | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/lib/Bytecode/Writer/WriterInternals.h b/lib/Bytecode/Writer/WriterInternals.h new file mode 100644 index 0000000000..be9ccf9667 --- /dev/null +++ b/lib/Bytecode/Writer/WriterInternals.h @@ -0,0 +1,74 @@ +//===-- 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 |