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
14using namespace llvm;
15using namespace gsym;
16
17FileWriter::~FileWriter() { OS.flush(); }
18
19void FileWriter::writeSLEB(int64_t S) {
20 uint8_t Bytes[32];
21 auto Length = encodeSLEB128(Value: S, p: Bytes);
22 assert(Length < sizeof(Bytes));
23 OS.write(Ptr: reinterpret_cast<const char *>(Bytes), Size: Length);
24}
25
26void FileWriter::writeULEB(uint64_t U) {
27 uint8_t Bytes[32];
28 auto Length = encodeULEB128(Value: U, p: Bytes);
29 assert(Length < sizeof(Bytes));
30 OS.write(Ptr: reinterpret_cast<const char *>(Bytes), Size: Length);
31}
32
33void FileWriter::writeU8(uint8_t U) {
34 OS.write(Ptr: reinterpret_cast<const char *>(&U), Size: sizeof(U));
35}
36
37void FileWriter::writeU16(uint16_t U) {
38 const uint16_t Swapped = support::endian::byte_swap(value: U, endian: ByteOrder);
39 OS.write(Ptr: reinterpret_cast<const char *>(&Swapped), Size: sizeof(Swapped));
40}
41
42void FileWriter::writeU32(uint32_t U) {
43 const uint32_t Swapped = support::endian::byte_swap(value: U, endian: ByteOrder);
44 OS.write(Ptr: reinterpret_cast<const char *>(&Swapped), Size: sizeof(Swapped));
45}
46
47void FileWriter::writeU64(uint64_t U) {
48 const uint64_t Swapped = support::endian::byte_swap(value: U, endian: ByteOrder);
49 OS.write(Ptr: reinterpret_cast<const char *>(&Swapped), Size: sizeof(Swapped));
50}
51
52void FileWriter::writeUnsigned(uint64_t Value, size_t ByteSize) {
53 assert(ByteSize <= 8 && "invalid byte size");
54 // Make sure the value fits in the number of bytes specified.
55 assert((ByteSize == 8 || (Value & (uint64_t)-1 << (8 * ByteSize)) == 0) &&
56 "potential data loss: higher bits are non-zero");
57 // Swap and shift bytes if endianness doesn't match.
58 if (ByteOrder != llvm::endianness::native)
59 Value = sys::getSwappedBytes(C: Value) >> (8 * (8 - ByteSize));
60 // Write from the least significant bytes of Value regardless of host
61 // endianness.
62 OS.write(Ptr: reinterpret_cast<const char *>(&Value) +
63 (sys::IsLittleEndianHost ? 0 : 8 - ByteSize),
64 Size: ByteSize);
65}
66
67void FileWriter::fixup32(uint32_t U, uint64_t Offset) {
68 const uint32_t Swapped = support::endian::byte_swap(value: U, endian: ByteOrder);
69 OS.pwrite(Ptr: reinterpret_cast<const char *>(&Swapped), Size: sizeof(Swapped),
70 Offset);
71}
72
73void FileWriter::writeData(llvm::ArrayRef<uint8_t> Data) {
74 OS.write(Ptr: reinterpret_cast<const char *>(Data.data()), Size: Data.size());
75}
76
77void FileWriter::writeNullTerminated(llvm::StringRef Str) {
78 OS << Str << '\0';
79}
80
81uint64_t FileWriter::tell() {
82 return OS.tell();
83}
84
85void FileWriter::alignTo(size_t Align) {
86 off_t Offset = OS.tell();
87 off_t AlignedOffset = (Offset + Align - 1) / Align * Align;
88 if (AlignedOffset == Offset)
89 return;
90 off_t PadCount = AlignedOffset - Offset;
91 OS.write_zeros(NumZeros: PadCount);
92}
93