1 // Copyright 2006 Google Inc. All Rights Reserved.
2 //
3 // Redistribution and use in source and binary forms, with or without
4 // modification, are permitted provided that the following conditions are
5 // met:
6 //
7 // * Redistributions of source code must retain the above copyright
8 // notice, this list of conditions and the following disclaimer.
9 // * Redistributions in binary form must reproduce the above
10 // copyright notice, this list of conditions and the following disclaimer
11 // in the documentation and/or other materials provided with the
12 // distribution.
13 // * Neither the name of Google Inc. nor the names of its
14 // contributors may be used to endorse or promote products derived from
15 // this software without specific prior written permission.
16 //
17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29 #ifndef UTIL_DEBUGINFO_BYTEREADER_INL_H__
30 #define UTIL_DEBUGINFO_BYTEREADER_INL_H__
31
32 #include "common/dwarf/bytereader.h"
33
34 #include <assert.h>
35
36 namespace dwarf2reader {
37
ReadOneByte(const char * buffer)38 inline uint8 ByteReader::ReadOneByte(const char* buffer) const {
39 return buffer[0];
40 }
41
ReadTwoBytes(const char * signed_buffer)42 inline uint16 ByteReader::ReadTwoBytes(const char* signed_buffer) const {
43 const unsigned char *buffer
44 = reinterpret_cast<const unsigned char *>(signed_buffer);
45 const uint16 buffer0 = buffer[0];
46 const uint16 buffer1 = buffer[1];
47 if (endian_ == ENDIANNESS_LITTLE) {
48 return buffer0 | buffer1 << 8;
49 } else {
50 return buffer1 | buffer0 << 8;
51 }
52 }
53
ReadFourBytes(const char * signed_buffer)54 inline uint64 ByteReader::ReadFourBytes(const char* signed_buffer) const {
55 const unsigned char *buffer
56 = reinterpret_cast<const unsigned char *>(signed_buffer);
57 const uint32 buffer0 = buffer[0];
58 const uint32 buffer1 = buffer[1];
59 const uint32 buffer2 = buffer[2];
60 const uint32 buffer3 = buffer[3];
61 if (endian_ == ENDIANNESS_LITTLE) {
62 return buffer0 | buffer1 << 8 | buffer2 << 16 | buffer3 << 24;
63 } else {
64 return buffer3 | buffer2 << 8 | buffer1 << 16 | buffer0 << 24;
65 }
66 }
67
ReadEightBytes(const char * signed_buffer)68 inline uint64 ByteReader::ReadEightBytes(const char* signed_buffer) const {
69 const unsigned char *buffer
70 = reinterpret_cast<const unsigned char *>(signed_buffer);
71 const uint64 buffer0 = buffer[0];
72 const uint64 buffer1 = buffer[1];
73 const uint64 buffer2 = buffer[2];
74 const uint64 buffer3 = buffer[3];
75 const uint64 buffer4 = buffer[4];
76 const uint64 buffer5 = buffer[5];
77 const uint64 buffer6 = buffer[6];
78 const uint64 buffer7 = buffer[7];
79 if (endian_ == ENDIANNESS_LITTLE) {
80 return buffer0 | buffer1 << 8 | buffer2 << 16 | buffer3 << 24 |
81 buffer4 << 32 | buffer5 << 40 | buffer6 << 48 | buffer7 << 56;
82 } else {
83 return buffer7 | buffer6 << 8 | buffer5 << 16 | buffer4 << 24 |
84 buffer3 << 32 | buffer2 << 40 | buffer1 << 48 | buffer0 << 56;
85 }
86 }
87
88 // Read an unsigned LEB128 number. Each byte contains 7 bits of
89 // information, plus one bit saying whether the number continues or
90 // not.
91
ReadUnsignedLEB128(const char * buffer,size_t * len)92 inline uint64 ByteReader::ReadUnsignedLEB128(const char* buffer,
93 size_t* len) const {
94 uint64 result = 0;
95 size_t num_read = 0;
96 unsigned int shift = 0;
97 unsigned char byte;
98
99 do {
100 byte = *buffer++;
101 num_read++;
102
103 result |= (static_cast<uint64>(byte & 0x7f)) << shift;
104
105 shift += 7;
106
107 } while (byte & 0x80);
108
109 *len = num_read;
110
111 return result;
112 }
113
114 // Read a signed LEB128 number. These are like regular LEB128
115 // numbers, except the last byte may have a sign bit set.
116
ReadSignedLEB128(const char * buffer,size_t * len)117 inline int64 ByteReader::ReadSignedLEB128(const char* buffer,
118 size_t* len) const {
119 int64 result = 0;
120 unsigned int shift = 0;
121 size_t num_read = 0;
122 unsigned char byte;
123
124 do {
125 byte = *buffer++;
126 num_read++;
127 result |= (static_cast<uint64>(byte & 0x7f) << shift);
128 shift += 7;
129 } while (byte & 0x80);
130
131 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
132 result |= -((static_cast<int64>(1)) << shift);
133 *len = num_read;
134 return result;
135 }
136
ReadOffset(const char * buffer)137 inline uint64 ByteReader::ReadOffset(const char* buffer) const {
138 assert(this->offset_reader_);
139 return (this->*offset_reader_)(buffer);
140 }
141
ReadAddress(const char * buffer)142 inline uint64 ByteReader::ReadAddress(const char* buffer) const {
143 assert(this->address_reader_);
144 return (this->*address_reader_)(buffer);
145 }
146
SetCFIDataBase(uint64 section_base,const char * buffer_base)147 inline void ByteReader::SetCFIDataBase(uint64 section_base,
148 const char *buffer_base) {
149 section_base_ = section_base;
150 buffer_base_ = buffer_base;
151 have_section_base_ = true;
152 }
153
SetTextBase(uint64 text_base)154 inline void ByteReader::SetTextBase(uint64 text_base) {
155 text_base_ = text_base;
156 have_text_base_ = true;
157 }
158
SetDataBase(uint64 data_base)159 inline void ByteReader::SetDataBase(uint64 data_base) {
160 data_base_ = data_base;
161 have_data_base_ = true;
162 }
163
SetFunctionBase(uint64 function_base)164 inline void ByteReader::SetFunctionBase(uint64 function_base) {
165 function_base_ = function_base;
166 have_function_base_ = true;
167 }
168
ClearFunctionBase()169 inline void ByteReader::ClearFunctionBase() {
170 have_function_base_ = false;
171 }
172
173 } // namespace dwarf2reader
174
175 #endif // UTIL_DEBUGINFO_BYTEREADER_INL_H__
176