sc_time.cc revision 12986:761e57785c6a 
1/*
2 * Copyright 2018 Google, Inc.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met: redistributions of source code must retain the above copyright
7 * notice, this list of conditions and the following disclaimer;
8 * redistributions in binary form must reproduce the above copyright
9 * notice, this list of conditions and the following disclaimer in the
10 * documentation and/or other materials provided with the distribution;
11 * neither the name of the copyright holders nor the names of its
12 * contributors may be used to endorse or promote products derived from
13 * this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
18 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
19 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
21 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 * Authors: Gabe Black
28 */
29
30#include "base/logging.hh"
31#include "python/pybind11/pybind.hh"
32#include "systemc/ext/core/sc_time.hh"
33
34namespace sc_core
35{
36
37namespace
38{
39
40const char *TimeUnitNames[] = {
41    [SC_FS] = "fs",
42    [SC_PS] = "ps",
43    [SC_NS] = "ns",
44    [SC_US] = "us",
45    [SC_MS] = "ms",
46    [SC_SEC] = "s"
47};
48
49double TimeUnitScale[] = {
50    [SC_FS] = 1.0e-15,
51    [SC_PS] = 1.0e-12,
52    [SC_NS] = 1.0e-9,
53    [SC_US] = 1.0e-6,
54    [SC_MS] = 1.0e-3,
55    [SC_SEC] = 1.0
56};
57
58void
59fixTimeResolution()
60{
61    static bool fixed = false;
62    if (fixed)
63        return;
64
65    auto ticks = pybind11::module::import("m5.ticks");
66    auto fix_global_frequency = ticks.attr("fixGlobalFrequency");
67    fix_global_frequency();
68    fixed = true;
69}
70
71} // anonymous namespace
72
73sc_time::sc_time() : val(0) {}
74
75sc_time::sc_time(double d, sc_time_unit tu)
76{
77    val = 0;
78    if (d != 0) {
79        fixTimeResolution();
80        //XXX Assuming the time resolution is 1ps.
81        double scale = TimeUnitScale[tu] / TimeUnitScale[SC_PS];
82        // Accellera claims there is a linux bug, and that these next two
83        // lines work around them.
84        volatile double tmp = d * scale + 0.5;
85        val = static_cast<uint64_t>(tmp);
86    }
87}
88
89sc_time::sc_time(const sc_time &t)
90{
91    val = t.val;
92}
93
94sc_time::sc_time(double, bool)
95{
96    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
97}
98
99sc_time::sc_time(sc_dt::uint64, bool)
100{
101    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
102}
103
104sc_time &
105sc_time::operator = (const sc_time &t)
106{
107    val = t.val;
108    return *this;
109}
110
111sc_dt::uint64
112sc_time::value() const
113{
114    return val;
115}
116
117double
118sc_time::to_double() const
119{
120    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
121    return 0.0;
122}
123double
124sc_time::to_seconds() const
125{
126    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
127    return 0.0;
128}
129
130const std::string
131sc_time::to_string() const
132{
133    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
134    return "";
135}
136
137bool
138sc_time::operator == (const sc_time &t) const
139{
140    return val == t.val;
141}
142
143bool
144sc_time::operator != (const sc_time &t) const
145{
146    return val != t.val;
147}
148
149bool
150sc_time::operator < (const sc_time &t) const
151{
152    return val < t.val;
153}
154
155bool
156sc_time::operator <= (const sc_time &t) const
157{
158    return val <= t.val;
159}
160
161bool
162sc_time::operator > (const sc_time &t) const
163{
164    return val > t.val;
165}
166
167bool
168sc_time::operator >= (const sc_time &t) const
169{
170    return val >= t.val;
171}
172
173sc_time &
174sc_time::operator += (const sc_time &t)
175{
176    val += t.val;
177    return *this;
178}
179
180sc_time &
181sc_time::operator -= (const sc_time &t)
182{
183    val -= t.val;
184    return *this;
185}
186
187sc_time &
188sc_time::operator *= (double)
189{
190    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
191    return *this;
192}
193
194sc_time &
195sc_time::operator /= (double)
196{
197    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
198    return *this;
199}
200
201void
202sc_time::print(std::ostream &os) const
203{
204    if (val == 0) {
205        os << "0 s";
206    } else {
207        //XXX Assuming the time resolution is 1ps.
208        sc_time_unit tu = SC_PS;
209        uint64_t scaled = val;
210        while (tu < SC_SEC && (scaled % 1000) == 0) {
211            tu = (sc_time_unit)((int)tu + 1);
212            scaled /= 1000;
213        }
214
215        os << scaled << ' ' << TimeUnitNames[tu];
216    }
217}
218
219sc_time
220sc_time::from_value(sc_dt::uint64 u)
221{
222    sc_time t;
223    t.val = u;
224    return t;
225}
226
227sc_time
228sc_time::from_seconds(double)
229{
230    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
231    return sc_time();
232}
233
234sc_time
235sc_time::from_string(const char *str)
236{
237    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
238    return sc_time();
239}
240
241const sc_time
242operator + (const sc_time &, const sc_time &)
243{
244    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
245    return sc_time();
246}
247
248const sc_time
249operator - (const sc_time &, const sc_time &)
250{
251    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
252    return sc_time();
253}
254
255const sc_time
256operator * (const sc_time &, double)
257{
258    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
259    return sc_time();
260}
261
262const sc_time
263operator * (double, const sc_time &)
264{
265    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
266    return sc_time();
267}
268
269const sc_time
270operator / (const sc_time &, double)
271{
272    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
273    return sc_time();
274}
275
276double
277operator / (const sc_time &, const sc_time &)
278{
279    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
280    return 0.0;
281}
282
283std::ostream &
284operator << (std::ostream &os, const sc_time &t)
285{
286    t.print(os);
287    return os;
288}
289
290const sc_time SC_ZERO_TIME;
291
292void
293sc_set_time_resolution(double, sc_time_unit)
294{
295    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
296}
297
298sc_time
299sc_get_time_resolution()
300{
301    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
302    return sc_time();
303}
304
305const sc_time &
306sc_max_time()
307{
308    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
309    return *(const sc_time *)nullptr;
310}
311
312void
313sc_set_default_time_unit(double, sc_time_unit)
314{
315    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
316}
317
318sc_time
319sc_get_default_time_unit()
320{
321    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
322    return *(sc_time *)nullptr;
323}
324
325sc_time_tuple::sc_time_tuple(const sc_time &)
326{
327    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
328}
329
330bool
331sc_time_tuple::has_value() const
332{
333    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
334    return false;
335}
336
337sc_dt::uint64
338sc_time_tuple::value() const
339{
340    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
341    return 0;
342}
343
344const char *
345sc_time_tuple::unit_symbol() const
346{
347    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
348    return "";
349}
350
351double
352sc_time_tuple::to_double() const
353{
354    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
355    return 0.0;
356}
357
358std::string
359sc_time_tuple::to_string() const
360{
361    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
362    return "";
363}
364
365} // namespace sc_core
366