-
Notifications
You must be signed in to change notification settings - Fork 16
/
vcdvcd.py
200 lines (182 loc) · 7.63 KB
/
vcdvcd.py
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
from __future__ import print_function
import math
class VCDVCD(object):
# Verilog standard terminology.
_VALUE = set(('0', '1', 'x', 'X', 'z', 'Z'))
_VECTOR_VALUE_CHANGE = set(('b', 'B', 'r', 'R'))
def __init__(
self,
vcd_path=None,
vcd_content=None,
only_sigs=False,
print_deltas=False,
print_dumps=False,
print_dumps_deltas=True,
# TODO: make the default None, and return empty in that case.
signals=[],
store_tvs=True,
):
"""
Parse a VCD file, and store information about it in this object.
The bulk of the parsed data can be obtained with :func:`parse_data`.
:type vcd_path: str
:param store_tv: if False, don't store time values in the data
Still parse them sequentially however, which may
make them be printed if printing is enabled.
This makes huge files more manageable, but prevents
fast random access.
:type store_tv: bool
:param only_sigs: only parse the signal names under $scope and exit.
The return value will only contain the signals section.
This speeds up parsing if you only want the list of signals.
:type only_sigs: bool
:type print_deltas: print the value of each signal change as hey are parsed
:type print_deltas: bool
:type print_dumps: print the value of all signals for each time
in which any tracked signal changes
:type print_dumps: bool
:type print_dumps_deltas: only dump selected signals if one of them just changed
:type print_dumps_deltas: bool
:param signals: only consider signals in this list.
If empty, all signals are considered.
Printing commands however will only print every wire
once with the first reference name found.
Any printing done uses this signal order.
If repeated signals are given, they are printed twice.
:type signals: List[str]
:rtype: Dict[str,Any]
"""
self._data = {}
self._endtime = 0
self._signals = []
self._store_tvs = store_tvs
self._signal_changed = False
all_sigs = not signals
cur_sig_vals = {}
hier = []
references_to_ids = {}
references_to_widths = {}
time = 0
if vcd_path:
with open(vcd_path, 'r') as f:
vcd_content = f.read()
for line in vcd_content.splitlines():
if line == '':
break
line0 = line[0]
line = line.strip()
if line == '':
continue
if line0 in self._VECTOR_VALUE_CHANGE:
value, identifier_code = line[1:].split()
self._add_value_identifier_code(
time, value, identifier_code,
print_deltas, print_dumps, cur_sig_vals
)
elif line0 in self._VALUE:
value = line0
identifier_code = line[1:]
self._add_value_identifier_code(
time, value, identifier_code,
print_deltas, print_dumps, cur_sig_vals
)
elif line0 == '#':
if print_dumps and (not print_dumps_deltas or self._signal_changed):
ss = []
ss.append('{}'.format(time))
for i, ref in enumerate(print_dumps_refs):
identifier_code = references_to_ids[ref]
value = cur_sig_vals[identifier_code]
ss.append('{0:>{1}s}'.format(self._to_hex(value), references_to_widths[ref]))
print(' '.join(ss))
time = int(line[1:])
self._endtime = time
self._signal_changed = False
elif '$enddefinitions' in line:
if only_sigs:
break
if print_dumps:
print('0 time')
if signals:
print_dumps_refs = signals
else:
print_dumps_refs = sorted(self._data[i]['references'][0] for i in cur_sig_vals.keys())
for i, ref in enumerate(print_dumps_refs, 1):
print('{} {}'.format(i, ref))
if i == 0:
i = 1
identifier_code = references_to_ids[ref]
size = int(self._data[identifier_code]['size'])
width = max(((size // 4)), int(math.floor(math.log10(i))) + 1)
references_to_widths[ref] = width
print()
print('0 '.format(i, ), end='')
for i, ref in enumerate(print_dumps_refs, 1):
print('{0:>{1}d} '.format(i, references_to_widths[ref]), end='')
print()
print('=' * (sum(references_to_widths.values()) + len(references_to_widths) + 1))
elif '$scope' in line:
hier.append(line.split()[2])
elif '$upscope' in line:
hier.pop()
elif '$var' in line:
ls = line.split()
type = ls[1]
size = ls[2]
identifier_code = ls[3]
name = ''.join(ls[4:-1])
path = '.'.join(hier)
reference = path + '.' + name
if (reference in signals) or all_sigs:
self._signals.append(reference)
if identifier_code not in self._data:
self._data[identifier_code] = {
'references': [],
'size': size,
'var_type': type,
}
self._data[identifier_code]['references'].append(reference)
references_to_ids[reference] = identifier_code
if print_dumps:
cur_sig_vals[identifier_code] = 'x'
def get_data(self):
"""
Get the main parsed VCD data.
"""
return self._data
def get_endtime(self):
"""
Last timestamp present in the last parsed VCD.
This can be extracted from the data, but we also cache while parsing.
:rtype: int
"""
return self._endtime
def get_signals(self):
"""
Get the set of unique signal names from the parsed VCD,
in the order they are defined in the file.
This can be extracted from the data, but we also cache while parsing.
:rtype: List[str]
"""
return self._signals
def _add_value_identifier_code(
self, time, value, identifier_code,
print_deltas, print_dumps, cur_sig_vals
):
if identifier_code in self._data:
entry = self._data[identifier_code]
self._signal_changed = True
if self._store_tvs:
if 'tv' not in entry:
entry['tv'] = []
entry['tv'].append((time, value))
if print_deltas:
print("{} {} {}".format(time, self._to_hex(value), entry['references'][0]))
if print_dumps:
cur_sig_vals[identifier_code] = value
@staticmethod
def _to_hex(s):
for c in s:
if not c in '01':
return c
return hex(int(s, 2))[2:]