src/llvm/lib/CodeGen/AsmPrinter/ByteStreamer.h

   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_LIB_CODEGEN_ASMPRINTER_BYTESTREAMER_H
  16 #define LLVM_LIB_CODEGEN_ASMPRINTER_BYTESTREAMER_H
  17
  18 #include "DIEHash.h"
  19 #include "llvm/ADT/ArrayRef.h"
  20 #include "llvm/CodeGen/AsmPrinter.h"
  21 #include "llvm/MC/MCStreamer.h"
  22
  23 namespace llvm {
  24 class 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
  34 class APByteStreamer : public ByteStreamer {
  35 private:
  36   AsmPrinter &AP;
  37
  38 public:
  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
  54 class 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