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//===-- llvm/CodeGen/ByteStreamer.h - ByteStreamer class --------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains a class that can take bytes that would normally be
// streamed via the AsmPrinter.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_BYTESTREAMER_H
#define LLVM_LIB_CODEGEN_ASMPRINTER_BYTESTREAMER_H
#include "DIEHash.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/Support/LEB128.h"
#include <string>
namespace llvm {
class ByteStreamer {
public:
virtual ~ByteStreamer() {}
// For now we're just handling the calls we need for dwarf emission/hashing.
virtual void EmitInt8(uint8_t Byte, const Twine &Comment = "") = 0;
virtual void EmitSLEB128(uint64_t DWord, const Twine &Comment = "") = 0;
virtual void EmitULEB128(uint64_t DWord, const Twine &Comment = "") = 0;
};
class APByteStreamer : public ByteStreamer {
private:
AsmPrinter &AP;
public:
APByteStreamer(AsmPrinter &Asm) : AP(Asm) {}
void EmitInt8(uint8_t Byte, const Twine &Comment) override {
AP.OutStreamer.AddComment(Comment);
AP.EmitInt8(Byte);
}
void EmitSLEB128(uint64_t DWord, const Twine &Comment) override {
AP.OutStreamer.AddComment(Comment);
AP.EmitSLEB128(DWord);
}
void EmitULEB128(uint64_t DWord, const Twine &Comment) override {
AP.OutStreamer.AddComment(Comment);
AP.EmitULEB128(DWord);
}
};
class HashingByteStreamer : public ByteStreamer {
private:
DIEHash &Hash;
public:
HashingByteStreamer(DIEHash &H) : Hash(H) {}
void EmitInt8(uint8_t Byte, const Twine &Comment) override {
Hash.update(Byte);
}
void EmitSLEB128(uint64_t DWord, const Twine &Comment) override {
Hash.addSLEB128(DWord);
}
void EmitULEB128(uint64_t DWord, const Twine &Comment) override {
Hash.addULEB128(DWord);
}
};
class BufferByteStreamer : public ByteStreamer {
private:
SmallVectorImpl<char> &Buffer;
// FIXME: This is actually only needed for textual asm output.
SmallVectorImpl<std::string> &Comments;
public:
BufferByteStreamer(SmallVectorImpl<char> &Buffer,
SmallVectorImpl<std::string> &Comments)
: Buffer(Buffer), Comments(Comments) {}
void EmitInt8(uint8_t Byte, const Twine &Comment) override {
Buffer.push_back(Byte);
Comments.push_back(Comment.str());
}
void EmitSLEB128(uint64_t DWord, const Twine &Comment) override {
raw_svector_ostream OSE(Buffer);
encodeSLEB128(DWord, OSE);
Comments.push_back(Comment.str());
}
void EmitULEB128(uint64_t DWord, const Twine &Comment) override {
raw_svector_ostream OSE(Buffer);
encodeULEB128(DWord, OSE);
Comments.push_back(Comment.str());
}
};
}
#endif
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