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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/*
* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include "DwarfInfo.h"
#include <AK/FlyString.h>
#include <AK/MemoryStream.h>
#include <AK/Vector.h>
namespace Debug::Dwarf {
struct [[gnu::packed]] LineProgramUnitHeader32Common {
u32 length;
u16 version;
};
struct [[gnu::packed]] LineProgramUnitHeader32V4Ext {
u32 header_length;
u8 min_instruction_length;
u8 max_instruction_length;
u8 default_is_stmt;
i8 line_base;
u8 line_range;
u8 opcode_base;
};
struct [[gnu::packed]] LineProgramUnitHeader32V5Ext {
u8 address_size;
u8 segment_selector_size;
u32 header_length;
u8 min_instruction_length;
u8 max_instruction_length;
u8 default_is_stmt;
i8 line_base;
u8 line_range;
u8 opcode_base;
};
struct [[gnu::packed]] LineProgramUnitHeader32 {
LineProgramUnitHeader32Common common;
union {
LineProgramUnitHeader32V4Ext v4;
LineProgramUnitHeader32V5Ext v5;
};
u8 std_opcode_lengths[13];
size_t header_size() const
{
return sizeof(common) + ((common.version <= 4) ? sizeof(v4) : sizeof(v5)) + (opcode_base() - 1) * sizeof(std_opcode_lengths[0]);
}
u32 length() const { return common.length; }
u16 version() const { return common.version; }
u32 header_length() const { return (common.version <= 4) ? v4.header_length : v5.header_length; }
u8 min_instruction_length() const { return (common.version <= 4) ? v4.min_instruction_length : v5.min_instruction_length; }
u8 default_is_stmt() const { return (common.version <= 4) ? v4.default_is_stmt : v5.default_is_stmt; }
i8 line_base() const { return (common.version <= 4) ? v4.line_base : v5.line_base; }
u8 line_range() const { return (common.version <= 4) ? v4.line_range : v5.line_range; }
u8 opcode_base() const { return (common.version <= 4) ? v4.opcode_base : v5.opcode_base; }
};
enum class ContentType {
Path = 1,
DirectoryIndex = 2,
Timestamp = 3,
Size = 4,
MD5 = 5,
LoUser = 0x2000,
HiUser = 0x3fff,
};
struct PathEntryFormat {
ContentType type;
AttributeDataForm form;
};
struct PathEntry {
String path;
size_t directory_index { 0 };
};
enum class PathListType {
Directories,
Filenames,
};
inline InputStream& operator>>(InputStream& stream, LineProgramUnitHeader32& header)
{
stream.read_or_error(Bytes { &header.common, sizeof(header.common) });
if (header.common.version <= 4)
stream.read_or_error(Bytes { &header.v4, sizeof(header.v4) });
else
stream.read_or_error(Bytes { &header.v5, sizeof(header.v5) });
stream.read_or_error(Bytes { &header.std_opcode_lengths, min(sizeof(header.std_opcode_lengths), (header.opcode_base() - 1) * sizeof(header.std_opcode_lengths[0])) });
return stream;
}
class LineProgram {
AK_MAKE_NONCOPYABLE(LineProgram);
AK_MAKE_NONMOVABLE(LineProgram);
public:
explicit LineProgram(DwarfInfo& dwarf_info, InputMemoryStream& stream);
struct LineInfo {
u32 address { 0 };
FlyString file;
size_t line { 0 };
};
const Vector<LineInfo>& lines() const { return m_lines; }
struct DirectoryAndFile {
FlyString directory;
FlyString filename;
};
DirectoryAndFile get_directory_and_file(size_t file_index) const;
private:
void parse_unit_header();
void parse_source_directories();
void parse_source_files();
void run_program();
void append_to_line_info();
void reset_registers();
void handle_extended_opcode();
void handle_standard_opcode(u8 opcode);
void handle_special_opcode(u8 opcode);
void parse_path_entries(Function<void(PathEntry& entry)> callback, PathListType list_type);
enum StandardOpcodes {
Copy = 1,
AdvancePc,
AdvanceLine,
SetFile,
SetColumn,
NegateStatement,
SetBasicBlock,
ConstAddPc,
FixAdvancePc,
SetProlougeEnd,
SetEpilogueBegin,
SetIsa
};
enum ExtendedOpcodes {
EndSequence = 1,
SetAddress,
DefineFile,
SetDiscriminator,
};
struct FileEntry {
FlyString name;
size_t directory_index { 0 };
};
static constexpr u16 MIN_DWARF_VERSION = 3;
static constexpr u16 MAX_DWARF_VERSION = 5;
DwarfInfo& m_dwarf_info;
InputMemoryStream& m_stream;
size_t m_unit_offset { 0 };
LineProgramUnitHeader32 m_unit_header {};
Vector<String> m_source_directories;
Vector<FileEntry> m_source_files;
// The registers of the "line program" virtual machine
u32 m_address { 0 };
size_t m_line { 0 };
size_t m_file_index { 0 };
bool m_is_statement { false };
bool m_basic_block { false };
Vector<LineInfo> m_lines;
};
}
|
