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 }
79