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 <sstream>
31#include <vector>
32
33#include "base/logging.hh"
34#include "base/types.hh"
35#include "python/pybind11/pybind.hh"
36#include "sim/core.hh"
37#include "systemc/core/python.hh"
38#include "systemc/ext/core/sc_main.hh"
39#include "systemc/ext/core/sc_time.hh"
40#include "systemc/ext/utils/sc_report_handler.hh"
41
42namespace sc_core
43{
44
45namespace
46{
47
48const char *TimeUnitNames[] = {
49 [SC_FS] = "fs",
50 [SC_PS] = "ps",
51 [SC_NS] = "ns",
52 [SC_US] = "us",
53 [SC_MS] = "ms",
54 [SC_SEC] = "s"
55};
56
57double TimeUnitScale[] = {
58 [SC_FS] = 1.0e-15,
59 [SC_PS] = 1.0e-12,
60 [SC_NS] = 1.0e-9,
61 [SC_US] = 1.0e-6,
62 [SC_MS] = 1.0e-3,
63 [SC_SEC] = 1.0
64};
65
66Tick TimeUnitFrequency[] = {
67 [SC_FS] = 1ULL * 1000 * 1000 * 1000 * 1000 * 1000,
68 [SC_PS] = 1ULL * 1000 * 1000 * 1000 * 1000,
69 [SC_NS] = 1ULL * 1000 * 1000 * 1000,
70 [SC_US] = 1ULL * 1000 * 1000,
71 [SC_MS] = 1ULL * 1000,
72 [SC_SEC] = 1ULL
73};
74
75bool timeFixed = false;
76bool pythonReady = false;
77
78struct SetInfo
79{
80 SetInfo(::sc_core::sc_time *time, double d, ::sc_core::sc_time_unit tu) :
81 time(time), d(d), tu(tu)
82 {}
83
84 ::sc_core::sc_time *time;
85 double d;
86 ::sc_core::sc_time_unit tu;
87};
88std::vector<SetInfo> toSet;
89
90void
91setWork(sc_time *time, double d, ::sc_core::sc_time_unit tu)
92{
93 double scale = TimeUnitScale[tu] * SimClock::Float::s;
94 // Accellera claims there is a linux bug, and that these next two
95 // lines work around them.
96 volatile double tmp = d * scale + 0.5;
97 *time = sc_time::from_value(static_cast<uint64_t>(tmp));
98}
99
100void
101fixTime()
102{
103 auto ticks = pybind11::module::import("m5.ticks");
104 auto fix_global_frequency = ticks.attr("fixGlobalFrequency");
105 fix_global_frequency();
106
107 for (auto &t: toSet)
108 setWork(t.time, t.d, t.tu);
109 toSet.clear();
110}
111
112void
113attemptToFixTime()
114{
115 // Only fix time once.
116 if (!timeFixed) {
117 timeFixed = true;
118
119 // If we've run, python is working and we haven't fixed time yet.
120 if (pythonReady)
121 fixTime();
122 }
123}
124
125void
126setGlobalFrequency(Tick ticks_per_second)
127{
128 auto ticks = pybind11::module::import("m5.ticks");
129 auto set_global_frequency = ticks.attr("setGlobalFrequency");
130 set_global_frequency(ticks_per_second);
131 fixTime();
132}
133
134void
135set(::sc_core::sc_time *time, double d, ::sc_core::sc_time_unit tu)
136{
137 if (d != 0)
138 attemptToFixTime();
139 if (pythonReady) {
140 // Time should be working. Set up this sc_time.
141 setWork(time, d, tu);
142 } else {
143 // Time isn't set up yet. Defer setting up this sc_time.
144 toSet.emplace_back(time, d, tu);
145 }
146}
147
148class TimeSetter : public ::sc_gem5::PythonReadyFunc
149{
150 public:
151 TimeSetter() : ::sc_gem5::PythonReadyFunc() {}
152
153 void
154 run() override
155 {
156 // Record that we've run and python/pybind should be usable.
157 pythonReady = true;
158
159 // If time is already fixed, let python know.
160 if (timeFixed)
161 fixTime();
162 }
163} timeSetter;
164
165double defaultUnit = 1.0e-9;
166
167} // anonymous namespace
168
169sc_time::sc_time() : val(0) {}
170
171sc_time::sc_time(double d, sc_time_unit tu)
172{
173 val = 0;
174 set(this, d, tu);
175}
176
177sc_time::sc_time(const sc_time &t)
178{
179 val = t.val;
180}
181
182sc_time::sc_time(double d, bool scale)
183{
184 double scaler = scale ? defaultUnit : SimClock::Float::Hz;
185 set(this, d * scaler, SC_SEC);
186}
187
188sc_time::sc_time(sc_dt::uint64 v, bool scale)
189{
190 double scaler = scale ? defaultUnit : SimClock::Float::Hz;
191 set(this, static_cast<double>(v) * scaler, SC_SEC);
192}
193
194sc_time &
195sc_time::operator = (const sc_time &t)
196{
197 val = t.val;
198 return *this;
199}
200
201sc_dt::uint64
202sc_time::value() const
203{
204 return val;
205}
206
207double
208sc_time::to_double() const
209{
210 return static_cast<double>(val);
211}
212double
213sc_time::to_seconds() const
214{
215 return to_double() * SimClock::Float::Hz;
216}
217
218const std::string
219sc_time::to_string() const
220{
221 std::ostringstream ss;
222 print(ss);
223 return ss.str();
224}
225
226bool
227sc_time::operator == (const sc_time &t) const
228{
229 return val == t.val;
230}
231
232bool
233sc_time::operator != (const sc_time &t) const
234{
235 return val != t.val;
236}
237
238bool
239sc_time::operator < (const sc_time &t) const
240{
241 return val < t.val;
242}
243
244bool
245sc_time::operator <= (const sc_time &t) const
246{
247 return val <= t.val;
248}
249
250bool
251sc_time::operator > (const sc_time &t) const
252{
253 return val > t.val;
254}
255
256bool
257sc_time::operator >= (const sc_time &t) const
258{
259 return val >= t.val;
260}
261
262sc_time &
263sc_time::operator += (const sc_time &t)
264{
265 val += t.val;
266 return *this;
267}
268
269sc_time &
270sc_time::operator -= (const sc_time &t)
271{
272 val -= t.val;
273 return *this;
274}
275
276sc_time &
277sc_time::operator *= (double d)
278{
279 val = static_cast<int64_t>(static_cast<double>(val) * d + 0.5);
280 return *this;
281}
282
283sc_time &
284sc_time::operator /= (double d)
285{
286 val = static_cast<int64_t>(static_cast<double>(val) / d + 0.5);
287 return *this;
288}
289
290void
291sc_time::print(std::ostream &os) const
292{
293 if (val == 0) {
294 os << "0 s";
295 } else {
296 Tick frequency = SimClock::Frequency;
297
298 // Shrink the frequency by scaling down the time period, ie converting
299 // it from cycles per second to cycles per millisecond, etc.
300 sc_time_unit tu = SC_SEC;
301 while (tu > 1 && (frequency % 1000 == 0)) {
302 tu = (sc_time_unit)((int)tu - 1);
303 frequency /= 1000;
304 }
305
306 // Convert the frequency into a period.
307 Tick period;
308 if (frequency > 1) {
309 tu = (sc_time_unit)((int)tu - 1);
310 period = 1000 / frequency;
311 } else {
312 period = frequency;
313 }
314
315 // Scale our integer value by the period.
316 uint64_t scaled = val * period;
317
318 // Shrink the scaled time value by increasing the size of the units
319 // it's measured by, avoiding fractional parts.
320 while (tu < SC_SEC && (scaled % 1000) == 0) {
321 tu = (sc_time_unit)((int)tu + 1);
322 scaled /= 1000;
323 }
324
325 os << scaled << ' ' << TimeUnitNames[tu];
326 }
327}
328
329sc_time
330sc_time::from_value(sc_dt::uint64 u)
331{
332 if (u)
333 attemptToFixTime();
334 sc_time t;
335 t.val = u;
336 return t;
337}
338
339sc_time
340sc_time::from_seconds(double d)
341{
342 sc_time t;
343 set(&t, d, SC_SEC);
344 return t;
345}
346
347sc_time
348sc_time::from_string(const char *str)
349{
350 warn("%s not implemented.\n", __PRETTY_FUNCTION__);
351 return sc_time();
352}
353
354const sc_time
355operator + (const sc_time &a, const sc_time &b)
356{
357 return sc_time::from_value(a.value() + b.value());
358}
359
360const sc_time
361operator - (const sc_time &a, const sc_time &b)
362{
363 return sc_time::from_value(a.value() - b.value());
364}
365
366const sc_time
367operator * (const sc_time &t, double d)
368{
369 volatile double tmp = static_cast<double>(t.value()) * d + 0.5;
370 return sc_time::from_value(static_cast<int64_t>(tmp));
371}
372
373const sc_time
374operator * (double d, const sc_time &t)
375{
376 volatile double tmp = d * static_cast<double>(t.value()) + 0.5;
377 return sc_time::from_value(static_cast<int64_t>(tmp));
378}
379
380const sc_time
381operator / (const sc_time &t, double d)
382{
383 volatile double tmp = static_cast<double>(t.value()) / d + 0.5;
384 return sc_time::from_value(static_cast<int64_t>(tmp));
385}
386
387double
388operator / (const sc_time &t1, const sc_time &t2)
389{
390 return t1.to_double() / t2.to_double();
391}
392
393std::ostream &
394operator << (std::ostream &os, const sc_time &t)
395{
396 t.print(os);
397 return os;
398}
399
400const sc_time SC_ZERO_TIME;
401
402void
403sc_set_time_resolution(double d, sc_time_unit tu)
404{
405 if (d <= 0.0) {
406 SC_REPORT_ERROR("(E514) set time resolution failed",
407 "value not positive");
408 }
409 double dummy;
410 if (modf(log10(d), &dummy) != 0.0) {
411 SC_REPORT_ERROR("(E514) set time resolution failed",
412 "value not a power of ten");
413 }
414 if (sc_is_running()) {
415 SC_REPORT_ERROR("(E514) set time resolution failed",
416 "simulation running");
417 }
418 static bool specified = false;
419 if (specified) {
420 SC_REPORT_ERROR("(E514) set time resolution failed",
421 "already specified");
422 }
423 // This won't detect the timescale being fixed outside of systemc, but
424 // it's at least some protection.
425 if (timeFixed) {
426 SC_REPORT_ERROR("(E514) set time resolution failed",
427 "sc_time object(s) constructed");
428 }
429
430 double seconds = d * TimeUnitScale[tu];
431 if (seconds < TimeUnitScale[SC_FS]) {
432 SC_REPORT_ERROR("(E514) set time resolution failed",
433 "value smaller than 1 fs");
434 }
435
436 if (seconds > defaultUnit) {
437 SC_REPORT_WARNING(
438 "(W516) default time unit changed to time resolution", "");
439 defaultUnit = seconds;
440 }
441
442 // Get rid of fractional parts of d.
443 while (d < 1.0 && tu > SC_FS) {
444 d *= 1000;
445 tu = (sc_time_unit)(tu - 1);
446 }
447
448 Tick ticks_per_second = TimeUnitFrequency[tu] / static_cast<Tick>(d);
449 setGlobalFrequency(ticks_per_second);
450 specified = true;
451}
452
453sc_time
454sc_get_time_resolution()
455{
456 return sc_time::from_value(1);
457}
458
459const sc_time &
460sc_max_time()
461{
462 static const sc_time MaxScTime = sc_time::from_value(MaxTick);
463 return MaxScTime;
464}
465
466void
467sc_set_default_time_unit(double d, sc_time_unit tu)
468{
469 if (d < 0.0) {
470 SC_REPORT_ERROR("(E515) set default time unit failed",
471 "value not positive");
472 }
473 double dummy;
474 if (modf(log10(d), &dummy) != 0.0) {
475 SC_REPORT_ERROR("(E515) set default time unit failed",
476 "value not a power of ten");
477 }
478 if (sc_is_running()) {
479 SC_REPORT_ERROR("(E515) set default time unit failed",
480 "simulation running");
481 }
482 static bool specified = false;
483 if (specified) {
484 SC_REPORT_ERROR("(E515) set default time unit failed",
485 "already specified");
486 }
487 // This won't detect the timescale being fixed outside of systemc, but
488 // it's at least some protection.
489 if (timeFixed) {
490 SC_REPORT_ERROR("(E515) set default time unit failed",
491 "sc_time object(s) constructed");
492 }
493
494 // Normalize d to seconds.
495 defaultUnit = d * TimeUnitScale[tu];
496 specified = true;
| 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 <sstream>
31#include <vector>
32
33#include "base/logging.hh"
34#include "base/types.hh"
35#include "python/pybind11/pybind.hh"
36#include "sim/core.hh"
37#include "systemc/core/python.hh"
38#include "systemc/ext/core/sc_main.hh"
39#include "systemc/ext/core/sc_time.hh"
40#include "systemc/ext/utils/sc_report_handler.hh"
41
42namespace sc_core
43{
44
45namespace
46{
47
48const char *TimeUnitNames[] = {
49 [SC_FS] = "fs",
50 [SC_PS] = "ps",
51 [SC_NS] = "ns",
52 [SC_US] = "us",
53 [SC_MS] = "ms",
54 [SC_SEC] = "s"
55};
56
57double TimeUnitScale[] = {
58 [SC_FS] = 1.0e-15,
59 [SC_PS] = 1.0e-12,
60 [SC_NS] = 1.0e-9,
61 [SC_US] = 1.0e-6,
62 [SC_MS] = 1.0e-3,
63 [SC_SEC] = 1.0
64};
65
66Tick TimeUnitFrequency[] = {
67 [SC_FS] = 1ULL * 1000 * 1000 * 1000 * 1000 * 1000,
68 [SC_PS] = 1ULL * 1000 * 1000 * 1000 * 1000,
69 [SC_NS] = 1ULL * 1000 * 1000 * 1000,
70 [SC_US] = 1ULL * 1000 * 1000,
71 [SC_MS] = 1ULL * 1000,
72 [SC_SEC] = 1ULL
73};
74
75bool timeFixed = false;
76bool pythonReady = false;
77
78struct SetInfo
79{
80 SetInfo(::sc_core::sc_time *time, double d, ::sc_core::sc_time_unit tu) :
81 time(time), d(d), tu(tu)
82 {}
83
84 ::sc_core::sc_time *time;
85 double d;
86 ::sc_core::sc_time_unit tu;
87};
88std::vector<SetInfo> toSet;
89
90void
91setWork(sc_time *time, double d, ::sc_core::sc_time_unit tu)
92{
93 double scale = TimeUnitScale[tu] * SimClock::Float::s;
94 // Accellera claims there is a linux bug, and that these next two
95 // lines work around them.
96 volatile double tmp = d * scale + 0.5;
97 *time = sc_time::from_value(static_cast<uint64_t>(tmp));
98}
99
100void
101fixTime()
102{
103 auto ticks = pybind11::module::import("m5.ticks");
104 auto fix_global_frequency = ticks.attr("fixGlobalFrequency");
105 fix_global_frequency();
106
107 for (auto &t: toSet)
108 setWork(t.time, t.d, t.tu);
109 toSet.clear();
110}
111
112void
113attemptToFixTime()
114{
115 // Only fix time once.
116 if (!timeFixed) {
117 timeFixed = true;
118
119 // If we've run, python is working and we haven't fixed time yet.
120 if (pythonReady)
121 fixTime();
122 }
123}
124
125void
126setGlobalFrequency(Tick ticks_per_second)
127{
128 auto ticks = pybind11::module::import("m5.ticks");
129 auto set_global_frequency = ticks.attr("setGlobalFrequency");
130 set_global_frequency(ticks_per_second);
131 fixTime();
132}
133
134void
135set(::sc_core::sc_time *time, double d, ::sc_core::sc_time_unit tu)
136{
137 if (d != 0)
138 attemptToFixTime();
139 if (pythonReady) {
140 // Time should be working. Set up this sc_time.
141 setWork(time, d, tu);
142 } else {
143 // Time isn't set up yet. Defer setting up this sc_time.
144 toSet.emplace_back(time, d, tu);
145 }
146}
147
148class TimeSetter : public ::sc_gem5::PythonReadyFunc
149{
150 public:
151 TimeSetter() : ::sc_gem5::PythonReadyFunc() {}
152
153 void
154 run() override
155 {
156 // Record that we've run and python/pybind should be usable.
157 pythonReady = true;
158
159 // If time is already fixed, let python know.
160 if (timeFixed)
161 fixTime();
162 }
163} timeSetter;
164
165double defaultUnit = 1.0e-9;
166
167} // anonymous namespace
168
169sc_time::sc_time() : val(0) {}
170
171sc_time::sc_time(double d, sc_time_unit tu)
172{
173 val = 0;
174 set(this, d, tu);
175}
176
177sc_time::sc_time(const sc_time &t)
178{
179 val = t.val;
180}
181
182sc_time::sc_time(double d, bool scale)
183{
184 double scaler = scale ? defaultUnit : SimClock::Float::Hz;
185 set(this, d * scaler, SC_SEC);
186}
187
188sc_time::sc_time(sc_dt::uint64 v, bool scale)
189{
190 double scaler = scale ? defaultUnit : SimClock::Float::Hz;
191 set(this, static_cast<double>(v) * scaler, SC_SEC);
192}
193
194sc_time &
195sc_time::operator = (const sc_time &t)
196{
197 val = t.val;
198 return *this;
199}
200
201sc_dt::uint64
202sc_time::value() const
203{
204 return val;
205}
206
207double
208sc_time::to_double() const
209{
210 return static_cast<double>(val);
211}
212double
213sc_time::to_seconds() const
214{
215 return to_double() * SimClock::Float::Hz;
216}
217
218const std::string
219sc_time::to_string() const
220{
221 std::ostringstream ss;
222 print(ss);
223 return ss.str();
224}
225
226bool
227sc_time::operator == (const sc_time &t) const
228{
229 return val == t.val;
230}
231
232bool
233sc_time::operator != (const sc_time &t) const
234{
235 return val != t.val;
236}
237
238bool
239sc_time::operator < (const sc_time &t) const
240{
241 return val < t.val;
242}
243
244bool
245sc_time::operator <= (const sc_time &t) const
246{
247 return val <= t.val;
248}
249
250bool
251sc_time::operator > (const sc_time &t) const
252{
253 return val > t.val;
254}
255
256bool
257sc_time::operator >= (const sc_time &t) const
258{
259 return val >= t.val;
260}
261
262sc_time &
263sc_time::operator += (const sc_time &t)
264{
265 val += t.val;
266 return *this;
267}
268
269sc_time &
270sc_time::operator -= (const sc_time &t)
271{
272 val -= t.val;
273 return *this;
274}
275
276sc_time &
277sc_time::operator *= (double d)
278{
279 val = static_cast<int64_t>(static_cast<double>(val) * d + 0.5);
280 return *this;
281}
282
283sc_time &
284sc_time::operator /= (double d)
285{
286 val = static_cast<int64_t>(static_cast<double>(val) / d + 0.5);
287 return *this;
288}
289
290void
291sc_time::print(std::ostream &os) const
292{
293 if (val == 0) {
294 os << "0 s";
295 } else {
296 Tick frequency = SimClock::Frequency;
297
298 // Shrink the frequency by scaling down the time period, ie converting
299 // it from cycles per second to cycles per millisecond, etc.
300 sc_time_unit tu = SC_SEC;
301 while (tu > 1 && (frequency % 1000 == 0)) {
302 tu = (sc_time_unit)((int)tu - 1);
303 frequency /= 1000;
304 }
305
306 // Convert the frequency into a period.
307 Tick period;
308 if (frequency > 1) {
309 tu = (sc_time_unit)((int)tu - 1);
310 period = 1000 / frequency;
311 } else {
312 period = frequency;
313 }
314
315 // Scale our integer value by the period.
316 uint64_t scaled = val * period;
317
318 // Shrink the scaled time value by increasing the size of the units
319 // it's measured by, avoiding fractional parts.
320 while (tu < SC_SEC && (scaled % 1000) == 0) {
321 tu = (sc_time_unit)((int)tu + 1);
322 scaled /= 1000;
323 }
324
325 os << scaled << ' ' << TimeUnitNames[tu];
326 }
327}
328
329sc_time
330sc_time::from_value(sc_dt::uint64 u)
331{
332 if (u)
333 attemptToFixTime();
334 sc_time t;
335 t.val = u;
336 return t;
337}
338
339sc_time
340sc_time::from_seconds(double d)
341{
342 sc_time t;
343 set(&t, d, SC_SEC);
344 return t;
345}
346
347sc_time
348sc_time::from_string(const char *str)
349{
350 warn("%s not implemented.\n", __PRETTY_FUNCTION__);
351 return sc_time();
352}
353
354const sc_time
355operator + (const sc_time &a, const sc_time &b)
356{
357 return sc_time::from_value(a.value() + b.value());
358}
359
360const sc_time
361operator - (const sc_time &a, const sc_time &b)
362{
363 return sc_time::from_value(a.value() - b.value());
364}
365
366const sc_time
367operator * (const sc_time &t, double d)
368{
369 volatile double tmp = static_cast<double>(t.value()) * d + 0.5;
370 return sc_time::from_value(static_cast<int64_t>(tmp));
371}
372
373const sc_time
374operator * (double d, const sc_time &t)
375{
376 volatile double tmp = d * static_cast<double>(t.value()) + 0.5;
377 return sc_time::from_value(static_cast<int64_t>(tmp));
378}
379
380const sc_time
381operator / (const sc_time &t, double d)
382{
383 volatile double tmp = static_cast<double>(t.value()) / d + 0.5;
384 return sc_time::from_value(static_cast<int64_t>(tmp));
385}
386
387double
388operator / (const sc_time &t1, const sc_time &t2)
389{
390 return t1.to_double() / t2.to_double();
391}
392
393std::ostream &
394operator << (std::ostream &os, const sc_time &t)
395{
396 t.print(os);
397 return os;
398}
399
400const sc_time SC_ZERO_TIME;
401
402void
403sc_set_time_resolution(double d, sc_time_unit tu)
404{
405 if (d <= 0.0) {
406 SC_REPORT_ERROR("(E514) set time resolution failed",
407 "value not positive");
408 }
409 double dummy;
410 if (modf(log10(d), &dummy) != 0.0) {
411 SC_REPORT_ERROR("(E514) set time resolution failed",
412 "value not a power of ten");
413 }
414 if (sc_is_running()) {
415 SC_REPORT_ERROR("(E514) set time resolution failed",
416 "simulation running");
417 }
418 static bool specified = false;
419 if (specified) {
420 SC_REPORT_ERROR("(E514) set time resolution failed",
421 "already specified");
422 }
423 // This won't detect the timescale being fixed outside of systemc, but
424 // it's at least some protection.
425 if (timeFixed) {
426 SC_REPORT_ERROR("(E514) set time resolution failed",
427 "sc_time object(s) constructed");
428 }
429
430 double seconds = d * TimeUnitScale[tu];
431 if (seconds < TimeUnitScale[SC_FS]) {
432 SC_REPORT_ERROR("(E514) set time resolution failed",
433 "value smaller than 1 fs");
434 }
435
436 if (seconds > defaultUnit) {
437 SC_REPORT_WARNING(
438 "(W516) default time unit changed to time resolution", "");
439 defaultUnit = seconds;
440 }
441
442 // Get rid of fractional parts of d.
443 while (d < 1.0 && tu > SC_FS) {
444 d *= 1000;
445 tu = (sc_time_unit)(tu - 1);
446 }
447
448 Tick ticks_per_second = TimeUnitFrequency[tu] / static_cast<Tick>(d);
449 setGlobalFrequency(ticks_per_second);
450 specified = true;
451}
452
453sc_time
454sc_get_time_resolution()
455{
456 return sc_time::from_value(1);
457}
458
459const sc_time &
460sc_max_time()
461{
462 static const sc_time MaxScTime = sc_time::from_value(MaxTick);
463 return MaxScTime;
464}
465
466void
467sc_set_default_time_unit(double d, sc_time_unit tu)
468{
469 if (d < 0.0) {
470 SC_REPORT_ERROR("(E515) set default time unit failed",
471 "value not positive");
472 }
473 double dummy;
474 if (modf(log10(d), &dummy) != 0.0) {
475 SC_REPORT_ERROR("(E515) set default time unit failed",
476 "value not a power of ten");
477 }
478 if (sc_is_running()) {
479 SC_REPORT_ERROR("(E515) set default time unit failed",
480 "simulation running");
481 }
482 static bool specified = false;
483 if (specified) {
484 SC_REPORT_ERROR("(E515) set default time unit failed",
485 "already specified");
486 }
487 // This won't detect the timescale being fixed outside of systemc, but
488 // it's at least some protection.
489 if (timeFixed) {
490 SC_REPORT_ERROR("(E515) set default time unit failed",
491 "sc_time object(s) constructed");
492 }
493
494 // Normalize d to seconds.
495 defaultUnit = d * TimeUnitScale[tu];
496 specified = true;
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