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
|
/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2022 Jannis Harder <jix@yosyshq.com> <me@jix.one>
*
* 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 "kernel/yw.h"
#include "libs/json11/json11.hpp"
USING_YOSYS_NAMESPACE
// Use the same formatting as witness.py uses
static const char *pretty_name(IdString id)
{
const char *c_str = id.c_str();
const char *p = c_str;
if (*p != '\\')
return c_str;
p++;
if (*p == '[') {
p++;
while (*p >= '0' && *p <= '9')
p++;
if (p[0] != ']' || p[1] != 0)
return c_str;
return c_str + 1;
}
if (!(*p >= 'a' && *p <= 'z') && !(*p >= 'A' && *p <= 'Z') && *p != '_')
return c_str;
p++;
while ((*p >= '0' && *p <= '9') || (*p >= 'a' && *p <= 'z') || (*p >= 'A' && *p <= 'Z') || *p == '_')
p++;
if (*p != 0)
return c_str;
return c_str + 1;
}
std::string IdPath::str() const
{
std::string result;
for (auto &item : *this) {
const char *pretty = pretty_name(item);
if (pretty[0] == '[') {
result += pretty;
continue;
}
if (!result.empty())
result += '.';
result += pretty;
if (pretty[0] == '\\' || pretty[0] == '$')
result += ' ';
}
return result;
}
bool IdPath::get_address(int &addr) const
{
if (empty())
return false;
auto &last = back();
if (!last.begins_with("\\["))
return false;
if (last == "\\[0]") {
addr = 0;
return true;
}
char first = last.c_str()[2];
if (first < '1' || first > '9')
return false;
char *endptr;
addr = std::strtol(last.c_str() + 2, &endptr, 10);
return endptr[0] == ']' && endptr[1] == 0;
}
static std::vector<IdString> get_path(const json11::Json &json)
{
std::vector<IdString> result;
for (auto &path_item : json.array_items()) {
auto const &path_item_str = path_item.string_value();
if (path_item_str.empty())
return {};;
result.push_back(path_item_str);
}
return result;
}
ReadWitness::ReadWitness(const std::string &filename) :
filename(filename)
{
std::ifstream f(filename.c_str());
if (f.fail() || GetSize(filename) == 0)
log_error("Cannot open file `%s`\n", filename.c_str());
std::stringstream buf;
buf << f.rdbuf();
std::string err;
json11::Json json = json11::Json::parse(buf.str(), err);
if (!err.empty())
log_error("Failed to parse `%s`: %s\n", filename.c_str(), err.c_str());
std::string format = json["format"].string_value();
if (format.empty())
log_error("Failed to parse `%s`: Unknown format\n", filename.c_str());
if (format != "Yosys Witness Trace")
log_error("Failed to parse `%s`: Unsupported format `%s`\n", filename.c_str(), format.c_str());
for (auto &clock_json : json["clocks"].array_items()) {
Clock clock;
clock.path = get_path(clock_json["path"]);
if (clock.path.empty())
log_error("Failed to parse `%s`: Missing path for clock `%s`\n", filename.c_str(), clock_json.dump().c_str());
auto edge_str = clock_json["edge"];
if (edge_str.string_value() == "posedge")
clock.is_posedge = true;
else if (edge_str.string_value() == "negedge")
clock.is_negedge = true;
else
log_error("Failed to parse `%s`: Unknown edge type for clock `%s`\n", filename.c_str(), clock_json.dump().c_str());
if (!clock_json["offset"].is_number())
log_error("Failed to parse `%s`: Unknown offset for clock `%s`\n", filename.c_str(), clock_json.dump().c_str());
clock.offset = clock_json["offset"].int_value();
if (clock.offset < 0)
log_error("Failed to parse `%s`: Invalid offset for clock `%s`\n", filename.c_str(), clock_json.dump().c_str());
clocks.push_back(clock);
}
int bits_offset = 0;
for (auto &signal_json : json["signals"].array_items()) {
Signal signal;
signal.bits_offset = bits_offset;
signal.path = get_path(signal_json["path"]);
if (signal.path.empty())
log_error("Failed to parse `%s`: Missing path for signal `%s`\n", filename.c_str(), signal_json.dump().c_str());
if (!signal_json["width"].is_number())
log_error("Failed to parse `%s`: Unknown width for signal `%s`\n", filename.c_str(), signal_json.dump().c_str());
signal.width = signal_json["width"].int_value();
if (signal.width < 0)
log_error("Failed to parse `%s`: Invalid width for signal `%s`\n", filename.c_str(), signal_json.dump().c_str());
bits_offset += signal.width;
if (!signal_json["offset"].is_number())
log_error("Failed to parse `%s`: Unknown offset for signal `%s`\n", filename.c_str(), signal_json.dump().c_str());
signal.offset = signal_json["offset"].int_value();
if (signal.offset < 0)
log_error("Failed to parse `%s`: Invalid offset for signal `%s`\n", filename.c_str(), signal_json.dump().c_str());
signal.init_only = json["init_only"].bool_value();
signals.push_back(signal);
}
for (auto &step_json : json["steps"].array_items()) {
Step step;
if (!step_json["bits"].is_string())
log_error("Failed to parse `%s`: Expected string as bits value for step %d\n", filename.c_str(), GetSize(steps));
step.bits = step_json["bits"].string_value();
for (char c : step.bits) {
if (c != '0' && c != '1' && c != 'x' && c != '?')
log_error("Failed to parse `%s`: Invalid bit '%c' value for step %d\n", filename.c_str(), c, GetSize(steps));
}
steps.push_back(step);
}
}
RTLIL::Const ReadWitness::get_bits(int t, int bits_offset, int width) const
{
log_assert(t >= 0 && t < GetSize(steps));
const std::string &bits = steps[t].bits;
RTLIL::Const result(State::Sa, width);
result.bits.reserve(width);
int read_begin = GetSize(bits) - 1 - bits_offset;
int read_end = max(-1, read_begin - width);
min(width, GetSize(bits) - bits_offset);
for (int i = read_begin, j = 0; i > read_end; i--, j++) {
RTLIL::State bit = State::Sa;
switch (bits[i]) {
case '0': bit = State::S0; break;
case '1': bit = State::S1; break;
case 'x': bit = State::Sx; break;
case '?': bit = State::Sa; break;
default:
log_abort();
}
result.bits[j] = bit;
}
return result;
}
|
