llvm/lib/DebugInfo/GSYM/FileWriter.cpp

   1 //===- FileWriter.cpp -------------------------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/DebugInfo/GSYM/FileWriter.h"
  10 #include "llvm/Support/LEB128.h"
  11 #include "llvm/Support/raw_ostream.h"
  12 #include <cassert>
  13
  14 using namespace llvm;
  15 using namespace gsym;
  16
  17 FileWriter::~FileWriter() { OS.flush(); }
  18
  19 void FileWriter::writeSLEB(int64_t S) {
  20   uint8_t Bytes[32];
  21   auto Length = encodeSLEB128(S, Bytes);
  22   assert(Length < sizeof(Bytes));
  23   OS.write(reinterpret_cast<const char *>(Bytes), Length);
  24 }
  25
  26 void FileWriter::writeULEB(uint64_t U) {
  27   uint8_t Bytes[32];
  28   auto Length = encodeULEB128(U, Bytes);
  29   assert(Length < sizeof(Bytes));
  30   OS.write(reinterpret_cast<const char *>(Bytes), Length);
  31 }
  32
  33 void FileWriter::writeU8(uint8_t U) {
  34   OS.write(reinterpret_cast<const char *>(&U), sizeof(U));
  35 }
  36
  37 void FileWriter::writeU16(uint16_t U) {
  38   const uint16_t Swapped = support::endian::byte_swap(U, ByteOrder);
  39   OS.write(reinterpret_cast<const char *>(&Swapped), sizeof(Swapped));
  40 }
  41
  42 void FileWriter::writeU32(uint32_t U) {
  43   const uint32_t Swapped = support::endian::byte_swap(U, ByteOrder);
  44   OS.write(reinterpret_cast<const char *>(&Swapped), sizeof(Swapped));
  45 }
  46
  47 void FileWriter::writeU64(uint64_t U) {
  48   const uint64_t Swapped = support::endian::byte_swap(U, ByteOrder);
  49   OS.write(reinterpret_cast<const char *>(&Swapped), sizeof(Swapped));
  50 }
  51
  52 void FileWriter::fixup32(uint32_t U, uint64_t Offset) {
  53   const uint32_t Swapped = support::endian::byte_swap(U, ByteOrder);
  54   OS.pwrite(reinterpret_cast<const char *>(&Swapped), sizeof(Swapped),
  55             Offset);
  56 }
  57
  58 void FileWriter::writeData(llvm::ArrayRef<uint8_t> Data) {
  59   OS.write(reinterpret_cast<const char *>(Data.data()), Data.size());
  60 }
  61
  62 void FileWriter::writeNullTerminated(llvm::StringRef Str) {
  63   OS << Str << '\0';
  64 }
  65
  66 uint64_t FileWriter::tell() {
  67   return OS.tell();
  68 }
  69
  70 void FileWriter::alignTo(size_t Align) {
  71   off_t Offset = OS.tell();
  72   off_t AlignedOffset = (Offset + Align - 1) / Align * Align;
  73   if (AlignedOffset == Offset)
  74     return;
  75   off_t PadCount = AlignedOffset - Offset;
  76   OS.write_zeros(PadCount);
  77 }