summaryrefslogtreecommitdiffstats
path: root/toolkit/crashreporter/google-breakpad/src/common/dwarf/bytereader-inl.h
blob: 42c92f943f40e8a6978f359b369b0b3c0e2c6fe6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
// Copyright 2006 Google Inc. All Rights Reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef UTIL_DEBUGINFO_BYTEREADER_INL_H__
#define UTIL_DEBUGINFO_BYTEREADER_INL_H__

#include "common/dwarf/bytereader.h"

#include <assert.h>
#include <stdint.h>

namespace dwarf2reader {

inline uint8 ByteReader::ReadOneByte(const uint8_t *buffer) const {
  return buffer[0];
}

inline uint16 ByteReader::ReadTwoBytes(const uint8_t *buffer) const {
  const uint16 buffer0 = buffer[0];
  const uint16 buffer1 = buffer[1];
  if (endian_ == ENDIANNESS_LITTLE) {
    return buffer0 | buffer1 << 8;
  } else {
    return buffer1 | buffer0 << 8;
  }
}

inline uint64 ByteReader::ReadFourBytes(const uint8_t *buffer) const {
  const uint32 buffer0 = buffer[0];
  const uint32 buffer1 = buffer[1];
  const uint32 buffer2 = buffer[2];
  const uint32 buffer3 = buffer[3];
  if (endian_ == ENDIANNESS_LITTLE) {
    return buffer0 | buffer1 << 8 | buffer2 << 16 | buffer3 << 24;
  } else {
    return buffer3 | buffer2 << 8 | buffer1 << 16 | buffer0 << 24;
  }
}

inline uint64 ByteReader::ReadEightBytes(const uint8_t *buffer) const {
  const uint64 buffer0 = buffer[0];
  const uint64 buffer1 = buffer[1];
  const uint64 buffer2 = buffer[2];
  const uint64 buffer3 = buffer[3];
  const uint64 buffer4 = buffer[4];
  const uint64 buffer5 = buffer[5];
  const uint64 buffer6 = buffer[6];
  const uint64 buffer7 = buffer[7];
  if (endian_ == ENDIANNESS_LITTLE) {
    return buffer0 | buffer1 << 8 | buffer2 << 16 | buffer3 << 24 |
      buffer4 << 32 | buffer5 << 40 | buffer6 << 48 | buffer7 << 56;
  } else {
    return buffer7 | buffer6 << 8 | buffer5 << 16 | buffer4 << 24 |
      buffer3 << 32 | buffer2 << 40 | buffer1 << 48 | buffer0 << 56;
  }
}

// Read an unsigned LEB128 number.  Each byte contains 7 bits of
// information, plus one bit saying whether the number continues or
// not.

inline uint64 ByteReader::ReadUnsignedLEB128(const uint8_t *buffer,
                                             size_t* len) const {
  uint64 result = 0;
  size_t num_read = 0;
  unsigned int shift = 0;
  uint8_t byte;

  do {
    byte = *buffer++;
    num_read++;

    result |= (static_cast<uint64>(byte & 0x7f)) << shift;

    shift += 7;

  } while (byte & 0x80);

  *len = num_read;

  return result;
}

// Read a signed LEB128 number.  These are like regular LEB128
// numbers, except the last byte may have a sign bit set.

inline int64 ByteReader::ReadSignedLEB128(const uint8_t *buffer,
                                          size_t* len) const {
  int64 result = 0;
  unsigned int shift = 0;
  size_t num_read = 0;
  uint8_t byte;

  do {
      byte = *buffer++;
      num_read++;
      result |= (static_cast<uint64>(byte & 0x7f) << shift);
      shift += 7;
  } while (byte & 0x80);

  if ((shift < 8 * sizeof (result)) && (byte & 0x40))
    result |= -((static_cast<int64>(1)) << shift);
  *len = num_read;
  return result;
}

inline uint64 ByteReader::ReadOffset(const uint8_t *buffer) const {
  assert(this->offset_reader_);
  return (this->*offset_reader_)(buffer);
}

inline uint64 ByteReader::ReadAddress(const uint8_t *buffer) const {
  assert(this->address_reader_);
  return (this->*address_reader_)(buffer);
}

inline void ByteReader::SetCFIDataBase(uint64 section_base,
                                       const uint8_t *buffer_base) {
  section_base_ = section_base;
  buffer_base_ = buffer_base;
  have_section_base_ = true;
}

inline void ByteReader::SetTextBase(uint64 text_base) {
  text_base_ = text_base;
  have_text_base_ = true;
}

inline void ByteReader::SetDataBase(uint64 data_base) {
  data_base_ = data_base;
  have_data_base_ = true;
}

inline void ByteReader::SetFunctionBase(uint64 function_base) {
  function_base_ = function_base;
  have_function_base_ = true;
}

inline void ByteReader::ClearFunctionBase() {
  have_function_base_ = false;
}

}  // namespace dwarf2reader

#endif  // UTIL_DEBUGINFO_BYTEREADER_INL_H__