ByteStreamer.h revision 36b56886974eae4f9c5ebc96befd3e7bfe5de338 
1//===-- llvm/CodeGen/ByteStreamer.h - ByteStreamer class --------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file contains a class that can take bytes that would normally be
11// streamed via the AsmPrinter.
12//
13//===----------------------------------------------------------------------===//
14
15#ifndef LLVM_CODEGEN_BYTESTREAMER_H
16#define LLVM_CODEGEN_BYTESTREAMER_H
17
18#include "llvm/ADT/ArrayRef.h"
19#include "llvm/CodeGen/AsmPrinter.h"
20#include "llvm/MC/MCStreamer.h"
21#include "DIEHash.h"
22
23namespace llvm {
24class ByteStreamer {
25 public:
26  virtual ~ByteStreamer() {}
27
28  // For now we're just handling the calls we need for dwarf emission/hashing.
29  virtual void EmitInt8(uint8_t Byte, const Twine &Comment = "") = 0;
30  virtual void EmitSLEB128(uint64_t DWord, const Twine &Comment = "") = 0;
31  virtual void EmitULEB128(uint64_t DWord, const Twine &Comment = "") = 0;
32};
33
34class APByteStreamer : public ByteStreamer {
35private:
36  AsmPrinter ≈
37
38public:
39  APByteStreamer(AsmPrinter &Asm) : AP(Asm) {}
40  void EmitInt8(uint8_t Byte, const Twine &Comment) override {
41    AP.OutStreamer.AddComment(Comment);
42    AP.EmitInt8(Byte);
43  }
44  void EmitSLEB128(uint64_t DWord, const Twine &Comment) override {
45    AP.OutStreamer.AddComment(Comment);
46    AP.EmitSLEB128(DWord);
47  }
48  void EmitULEB128(uint64_t DWord, const Twine &Comment) override {
49    AP.OutStreamer.AddComment(Comment);
50    AP.EmitULEB128(DWord);
51  }
52};
53
54class HashingByteStreamer : public ByteStreamer {
55 private:
56  DIEHash &Hash;
57 public:
58 HashingByteStreamer(DIEHash &H) : Hash(H) {}
59  void EmitInt8(uint8_t Byte, const Twine &Comment) override {
60    Hash.update(Byte);
61  }
62  void EmitSLEB128(uint64_t DWord, const Twine &Comment) override {
63    Hash.addSLEB128(DWord);
64  }
65  void EmitULEB128(uint64_t DWord, const Twine &Comment) override {
66    Hash.addULEB128(DWord);
67  }
68};
69}
70
71#endif
72