lib/DebugInfo/GSYM/FileWriter.cpp

   1 //===- FileWriter.cpp -------------------------------------------*- 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 #include "llvm/DebugInfo/GSYM/FileWriter.h"
  11 #include "llvm/Support/LEB128.h"
  12 #include "llvm/Support/raw_ostream.h"
  13 #include <cassert>
  14
  15 using namespace llvm;
  16 using namespace gsym;
  17
  18 FileWriter::~FileWriter() { OS.flush(); }
  19
  20 void FileWriter::writeSLEB(int64_t S) {
  21   uint8_t Bytes[32];
  22   auto Length = encodeSLEB128(S, Bytes);
  23   assert(Length < sizeof(Bytes));
  24   OS.write(reinterpret_cast<const char *>(Bytes), Length);
  25 }
  26
  27 void FileWriter::writeULEB(uint64_t U) {
  28   uint8_t Bytes[32];
  29   auto Length = encodeULEB128(U, Bytes);
  30   assert(Length < sizeof(Bytes));
  31   OS.write(reinterpret_cast<const char *>(Bytes), Length);
  32 }
  33
  34 void FileWriter::writeU8(uint8_t U) {
  35   OS.write(reinterpret_cast<const char *>(&U), sizeof(U));
  36 }
  37
  38 void FileWriter::writeU16(uint16_t U) {
  39   const uint16_t Swapped = support::endian::byte_swap(U, ByteOrder);
  40   OS.write(reinterpret_cast<const char *>(&Swapped), sizeof(Swapped));
  41 }
  42
  43 void FileWriter::writeU32(uint32_t U) {
  44   const uint32_t Swapped = support::endian::byte_swap(U, ByteOrder);
  45   OS.write(reinterpret_cast<const char *>(&Swapped), sizeof(Swapped));
  46 }
  47
  48 void FileWriter::writeU64(uint64_t U) {
  49   const uint64_t Swapped = support::endian::byte_swap(U, ByteOrder);
  50   OS.write(reinterpret_cast<const char *>(&Swapped), sizeof(Swapped));
  51 }
  52
  53 void FileWriter::fixup32(uint32_t U, uint64_t Offset) {
  54   const uint32_t Swapped = support::endian::byte_swap(U, ByteOrder);
  55   OS.pwrite(reinterpret_cast<const char *>(&Swapped), sizeof(Swapped),
  56             Offset);
  57 }
  58
  59 void FileWriter::writeData(llvm::ArrayRef<uint8_t> Data) {
  60   OS.write(reinterpret_cast<const char *>(Data.data()), Data.size());
  61 }
  62
  63 void FileWriter::writeNullTerminated(llvm::StringRef Str) {
  64   OS << Str << '\0';
  65 }
  66
  67 uint64_t FileWriter::tell() {
  68   return OS.tell();
  69 }
  70
  71 void FileWriter::alignTo(size_t Align) {
  72   off_t Offset = OS.tell();
  73   off_t AlignedOffset = (Offset + Align - 1) / Align * Align;
  74   if (AlignedOffset == Offset)
  75     return;
  76   off_t PadCount = AlignedOffset - Offset;
  77   OS.write_zeros(PadCount);
  78 }