lib/MC/MCObjectWriter.cpp

   1 //===- lib/MC/MCObjectWriter.cpp - MCObjectWriter implementation ----------===//
   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 #include "llvm/MC/MCObjectWriter.h"
  11
  12 using namespace llvm;
  13
  14 MCObjectWriter::~MCObjectWriter() {
  15 }
  16
  17 /// Utility function to encode a SLEB128 value.
  18 void MCObjectWriter::EncodeSLEB128(int64_t Value, raw_ostream &OS) {
  19   bool More;
  20   do {
  21     uint8_t Byte = Value & 0x7f;
  22     // NOTE: this assumes that this signed shift is an arithmetic right shift.
  23     Value >>= 7;
  24     More = !((((Value == 0 ) && ((Byte & 0x40) == 0)) ||
  25               ((Value == -1) && ((Byte & 0x40) != 0))));
  26     if (More)
  27       Byte |= 0x80; // Mark this byte that that more bytes will follow.
  28     OS << char(Byte);
  29   } while (More);
  30 }
  31
  32 /// Utility function to encode a ULEB128 value.
  33 void MCObjectWriter::EncodeULEB128(uint64_t Value, raw_ostream &OS) {
  34   do {
  35     uint8_t Byte = Value & 0x7f;
  36     Value >>= 7;
  37     if (Value != 0)
  38       Byte |= 0x80; // Mark this byte that that more bytes will follow.
  39     OS << char(Byte);
  40   } while (Value != 0);
  41 }