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
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
/*
* Copyright (C) 2020-2021 Jo-Philipp Wich <jo@mein.io>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <assert.h>
#include "chunk.h"
#include "types.h"
#include "util.h"
#define OFFSETINFO_BITS (sizeof(((uc_offsetinfo *)NULL)->entries[0]) * 8)
#define OFFSETINFO_BYTE_BITS 3
#define OFFSETINFO_INSN_BITS (OFFSETINFO_BITS - OFFSETINFO_BYTE_BITS)
#define OFFSETINFO_MAX_BYTES ((1 << OFFSETINFO_BYTE_BITS) - 1)
#define OFFSETINFO_MAX_INSNS ((1 << OFFSETINFO_INSN_BITS) - 1)
#define OFFSETINFO_NUM_BYTES(n) ((n) & OFFSETINFO_MAX_BYTES)
#define OFFSETINFO_NUM_INSNS(n) ((n) >> OFFSETINFO_BYTE_BITS)
#define OFFSETINFO_ENCODE(line, insns) ((line & OFFSETINFO_MAX_BYTES) | (((insns) << OFFSETINFO_BYTE_BITS) & ~OFFSETINFO_MAX_BYTES))
void
uc_chunk_init(uc_chunk *chunk)
{
chunk->count = 0;
chunk->entries = NULL;
chunk->ehranges.count = 0;
chunk->ehranges.entries = NULL;
chunk->debuginfo.offsets.count = 0;
chunk->debuginfo.offsets.entries = NULL;
chunk->debuginfo.variables.count = 0;
chunk->debuginfo.variables.entries = NULL;
uc_vallist_init(&chunk->constants);
uc_vallist_init(&chunk->debuginfo.varnames);
}
void
uc_chunk_free(uc_chunk *chunk)
{
uc_vector_clear(chunk);
uc_vector_clear(&chunk->ehranges);
uc_vallist_free(&chunk->constants);
uc_vector_clear(&chunk->debuginfo.offsets);
uc_vector_clear(&chunk->debuginfo.variables);
uc_vallist_free(&chunk->debuginfo.varnames);
uc_chunk_init(chunk);
}
size_t
uc_chunk_add(uc_chunk *chunk, uint8_t byte, size_t offset)
{
uc_offsetinfo *offsets = &chunk->debuginfo.offsets;
size_t i;
uc_vector_grow(chunk);
chunk->entries[chunk->count] = byte;
/* offset info is encoded in bytes, for each byte, the first three bits
* specify the number of source text bytes to advance since the last entry
* and the remaining five bits specify the amount of instructions belonging
* to any given source text offset */
if (offset > 0 || offsets->count == 0) {
/* if this offset is farther than seven (2 ** 3 - 1) bytes apart from
* the last one, we need to emit intermediate "jump" bytes with zero
* instructions each */
for (i = offset; i > OFFSETINFO_MAX_BYTES; i -= OFFSETINFO_MAX_BYTES) {
/* advance by 7 bytes */
uc_vector_grow(offsets);
offsets->entries[offsets->count++] = OFFSETINFO_ENCODE(OFFSETINFO_MAX_BYTES, 0);
}
/* advance by `i` bytes, count one instruction */
uc_vector_grow(offsets);
offsets->entries[offsets->count++] = OFFSETINFO_ENCODE(i, 1);
}
/* update instruction count at current offset entry */
else {
/* since we encode the per-offset instruction count in five bits, we
* can only count up to 31 instructions. If we exceed that limit,
* emit another offset entry with the initial three bits set to zero */
if (OFFSETINFO_NUM_INSNS(offsets->entries[offsets->count - 1]) >= OFFSETINFO_MAX_INSNS) {
/* advance by 0 bytes, count one instruction */
uc_vector_grow(offsets);
offsets->entries[offsets->count++] = OFFSETINFO_ENCODE(0, 1);
}
else {
offsets->entries[offsets->count - 1] = OFFSETINFO_ENCODE(
OFFSETINFO_NUM_BYTES(offsets->entries[offsets->count - 1]),
OFFSETINFO_NUM_INSNS(offsets->entries[offsets->count - 1]) + 1
);
}
}
return chunk->count++;
}
void
uc_chunk_pop(uc_chunk *chunk)
{
uc_offsetinfo *offsets = &chunk->debuginfo.offsets;
int n_insns;
assert(chunk->count > 0);
chunk->count--;
n_insns = OFFSETINFO_NUM_INSNS(offsets->entries[offsets->count - 1]);
if (n_insns > 0) {
offsets->entries[offsets->count - 1] = OFFSETINFO_ENCODE(
OFFSETINFO_NUM_BYTES(offsets->entries[offsets->count - 1]),
n_insns - 1
);
}
else {
offsets->count--;
}
}
uc_value_t *
uc_chunk_get_constant(uc_chunk *chunk, size_t idx)
{
return uc_vallist_get(&chunk->constants, idx);
}
ssize_t
uc_chunk_add_constant(uc_chunk *chunk, uc_value_t *val)
{
return uc_vallist_add(&chunk->constants, val);
}
size_t
uc_chunk_debug_get_srcpos(uc_chunk *chunk, size_t off)
{
uc_offsetinfo *offsets = &chunk->debuginfo.offsets;
size_t i, inum = 0, lnum = 0;
if (!offsets->count)
return 0;
for (i = 0; i < offsets->count && inum < off; i++) {
lnum += OFFSETINFO_NUM_BYTES(offsets->entries[i]);
inum += OFFSETINFO_NUM_INSNS(offsets->entries[i]);
}
return lnum;
}
void
uc_chunk_debug_add_variable(uc_chunk *chunk, size_t from, size_t to, size_t slot, bool upval, uc_value_t *name)
{
uc_variables *variables = &chunk->debuginfo.variables;
uc_value_list *varnames = &chunk->debuginfo.varnames;
assert(slot <= ((size_t)-1 / 2));
if (upval)
slot += (size_t)-1 / 2;
uc_vector_grow(variables);
variables->entries[variables->count].nameidx = uc_vallist_add(varnames, name);
variables->entries[variables->count].slot = slot;
variables->entries[variables->count].from = from;
variables->entries[variables->count].to = to;
variables->count++;
}
uc_value_t *
uc_chunk_debug_get_variable(uc_chunk *chunk, size_t off, size_t slot, bool upval)
{
uc_variables *variables = &chunk->debuginfo.variables;
uc_value_list *varnames = &chunk->debuginfo.varnames;
uc_value_t *name = NULL;
size_t i;
assert(slot <= ((size_t)-1 / 2));
if (upval)
slot += (size_t)-1 / 2;
for (i = 0; i < variables->count; i++) {
if (variables->entries[i].slot != slot ||
variables->entries[i].from > off ||
variables->entries[i].to < off)
continue;
name = uc_vallist_get(varnames, variables->entries[i].nameidx);
}
return name;
}
|
