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
~FileWriter()18 FileWriter::~FileWriter() { OS.flush(); }
19
writeSLEB(int64_t S)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
writeULEB(uint64_t U)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
writeU8(uint8_t U)34 void FileWriter::writeU8(uint8_t U) {
35 OS.write(reinterpret_cast<const char *>(&U), sizeof(U));
36 }
37
writeU16(uint16_t U)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
writeU32(uint32_t U)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
writeU64(uint64_t U)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
fixup32(uint32_t U,uint64_t Offset)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
writeData(llvm::ArrayRef<uint8_t> Data)59 void FileWriter::writeData(llvm::ArrayRef<uint8_t> Data) {
60 OS.write(reinterpret_cast<const char *>(Data.data()), Data.size());
61 }
62
writeNullTerminated(llvm::StringRef Str)63 void FileWriter::writeNullTerminated(llvm::StringRef Str) {
64 OS << Str << '\0';
65 }
66
tell()67 uint64_t FileWriter::tell() {
68 return OS.tell();
69 }
70
alignTo(size_t Align)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 }
79