sc_time.cc (13177:7b750aeab360) sc_time.cc (13195:de9e5572ac44)
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

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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"
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

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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"
36#include "systemc/core/python.hh"
37#include "systemc/ext/core/sc_main.hh"
38#include "systemc/ext/core/sc_time.hh"
39#include "systemc/ext/utils/sc_report_handler.hh"
40
41namespace sc_core
42{
43

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57 [SC_FS] = 1.0e-15,
58 [SC_PS] = 1.0e-12,
59 [SC_NS] = 1.0e-9,
60 [SC_US] = 1.0e-6,
61 [SC_MS] = 1.0e-3,
62 [SC_SEC] = 1.0
63};
64
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

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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
65bool timeFixed = false;
66bool pythonReady = false;
67
68struct SetInfo
69{
70 SetInfo(::sc_core::sc_time *time, double d, ::sc_core::sc_time_unit tu) :
71 time(time), d(d), tu(tu)
72 {}
73
74 ::sc_core::sc_time *time;
75 double d;
76 ::sc_core::sc_time_unit tu;
77};
78std::vector<SetInfo> toSet;
79
80void
81setWork(sc_time *time, double d, ::sc_core::sc_time_unit tu)
82{
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{
83 //XXX Assuming the time resolution is 1ps.
84 double scale = TimeUnitScale[tu] / TimeUnitScale[SC_PS];
93 double scale = TimeUnitScale[tu] * SimClock::Float::s;
85 // Accellera claims there is a linux bug, and that these next two
86 // lines work around them.
87 volatile double tmp = d * scale + 0.5;
88 *time = sc_time::from_value(static_cast<uint64_t>(tmp));
89}
90
91void
92fixTime()
93{
94 auto ticks = pybind11::module::import("m5.ticks");
95 auto fix_global_frequency = ticks.attr("fixGlobalFrequency");
96 fix_global_frequency();
97
98 for (auto &t: toSet)
99 setWork(t.time, t.d, t.tu);
100 toSet.clear();
101}
102
103void
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
104setGlobalFrequency(Tick ticks_per_second)
105{
106 auto ticks = pybind11::module::import("m5.ticks");
107 auto set_global_frequency = ticks.attr("setGlobalFrequency");
108 set_global_frequency(ticks_per_second);
109 fixTime();
110}
111
112void
113set(::sc_core::sc_time *time, double d, ::sc_core::sc_time_unit tu)
114{
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{
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 }
137 if (d != 0)
138 attemptToFixTime();
123 if (pythonReady) {
124 // Time should be working. Set up this sc_time.
125 setWork(time, d, tu);
126 } else {
127 // Time isn't set up yet. Defer setting up this sc_time.
128 toSet.emplace_back(time, d, tu);
129 }
130}

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150
151} // anonymous namespace
152
153sc_time::sc_time() : val(0) {}
154
155sc_time::sc_time(double d, sc_time_unit tu)
156{
157 val = 0;
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}

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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;
158 if (d != 0)
159 set(this, d, tu);
174 set(this, d, tu);
160}
161
162sc_time::sc_time(const sc_time &t)
163{
164 val = t.val;
165}
166
167sc_time::sc_time(double d, bool scale)
168{
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{
169 //XXX Assuming the time resolution is 1ps.
170 if (scale)
171 set(this, d * defaultUnit, SC_SEC);
172 else
173 set(this, d, SC_PS);
184 double scaler = scale ? defaultUnit : SimClock::Float::Hz;
185 set(this, d * scaler, SC_SEC);
174}
175
176sc_time::sc_time(sc_dt::uint64 v, bool scale)
177{
186}
187
188sc_time::sc_time(sc_dt::uint64 v, bool scale)
189{
178 //XXX Assuming the time resolution is 1ps.
179 if (scale)
180 set(this, static_cast<double>(v) * defaultUnit, SC_SEC);
181 else
182 set(this, static_cast<double>(v), SC_PS);
190 double scaler = scale ? defaultUnit : SimClock::Float::Hz;
191 set(this, static_cast<double>(v) * scaler, SC_SEC);
183}
184
185sc_time &
186sc_time::operator = (const sc_time &t)
187{
188 val = t.val;
189 return *this;
190}

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198double
199sc_time::to_double() const
200{
201 return static_cast<double>(val);
202}
203double
204sc_time::to_seconds() const
205{
192}
193
194sc_time &
195sc_time::operator = (const sc_time &t)
196{
197 val = t.val;
198 return *this;
199}

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207double
208sc_time::to_double() const
209{
210 return static_cast<double>(val);
211}
212double
213sc_time::to_seconds() const
214{
206 double d = to_double();
207 //XXX Assuming the time resolution is 1ps.
208 double scale = TimeUnitScale[SC_PS] / TimeUnitScale[SC_SEC];
209 return d * scale;
215 return to_double() * SimClock::Float::Hz;
210}
211
212const std::string
213sc_time::to_string() const
214{
215 std::ostringstream ss;
216 print(ss);
217 return ss.str();

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282}
283
284void
285sc_time::print(std::ostream &os) const
286{
287 if (val == 0) {
288 os << "0 s";
289 } else {
216}
217
218const std::string
219sc_time::to_string() const
220{
221 std::ostringstream ss;
222 print(ss);
223 return ss.str();

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288}
289
290void
291sc_time::print(std::ostream &os) const
292{
293 if (val == 0) {
294 os << "0 s";
295 } else {
290 //XXX Assuming the time resolution is 1ps.
291 sc_time_unit tu = SC_PS;
292 uint64_t scaled = val;
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.
293 while (tu < SC_SEC && (scaled % 1000) == 0) {
294 tu = (sc_time_unit)((int)tu + 1);
295 scaled /= 1000;
296 }
297
298 os << scaled << ' ' << TimeUnitNames[tu];
299 }
300}
301
302sc_time
303sc_time::from_value(sc_dt::uint64 u)
304{
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();
305 sc_time t;
306 t.val = u;
307 return t;
308}
309
310sc_time
311sc_time::from_seconds(double d)
312{

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393 }
394 // This won't detect the timescale being fixed outside of systemc, but
395 // it's at least some protection.
396 if (timeFixed) {
397 SC_REPORT_ERROR("(E514) set time resolution failed",
398 "sc_time object(s) constructed");
399 }
400
334 sc_time t;
335 t.val = u;
336 return t;
337}
338
339sc_time
340sc_time::from_seconds(double d)
341{

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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
401 // Normalize d to seconds.
402 d *= TimeUnitScale[tu];
403 if (d < TimeUnitScale[SC_FS]) {
430 double seconds = d * TimeUnitScale[tu];
431 if (seconds < TimeUnitScale[SC_FS]) {
404 SC_REPORT_ERROR("(E514) set time resolution failed",
405 "value smaller than 1 fs");
406 }
432 SC_REPORT_ERROR("(E514) set time resolution failed",
433 "value smaller than 1 fs");
434 }
407 // Change d from a period to a frequency.
408 d = 1 / d;
409 // Convert to integer ticks.
410 Tick ticks_per_second = static_cast<Tick>(d);
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);
411 setGlobalFrequency(ticks_per_second);
412 specified = true;
413}
414
415sc_time
416sc_get_time_resolution()
417{
418 return sc_time::from_value(1);

--- 89 unchanged lines hidden --- 		449 setGlobalFrequency(ticks_per_second);
450 specified = true;
451}
452
453sc_time
454sc_get_time_resolution()
455{
456 return sc_time::from_value(1);

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