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
~FileWriter()17 FileWriter::~FileWriter() { OS.flush(); }
18
writeSLEB(int64_t S)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
writeULEB(uint64_t U)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
writeU8(uint8_t U)33 void FileWriter::writeU8(uint8_t U) {
34 OS.write(reinterpret_cast<const char *>(&U), sizeof(U));
35 }
36
writeU16(uint16_t U)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
writeU32(uint32_t U)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
writeU64(uint64_t U)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
fixup32(uint32_t U,uint64_t Offset)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
writeData(llvm::ArrayRef<uint8_t> Data)58 void FileWriter::writeData(llvm::ArrayRef<uint8_t> Data) {
59 OS.write(reinterpret_cast<const char *>(Data.data()), Data.size());
60 }
61
writeNullTerminated(llvm::StringRef Str)62 void FileWriter::writeNullTerminated(llvm::StringRef Str) {
63 OS << Str << '\0';
64 }
65
tell()66 uint64_t FileWriter::tell() {
67 return OS.tell();
68 }
69
alignTo(size_t Align)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 }
78