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
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
|
/*
* Copyright 2018 Google, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Gabe Black
*/
#include "systemc/core/process.hh"
#include "base/logging.hh"
#include "systemc/core/event.hh"
#include "systemc/core/scheduler.hh"
#include "systemc/ext/core/sc_process_handle.hh"
#include "systemc/ext/utils/sc_report_handler.hh"
namespace sc_gem5
{
SensitivityTimeout::SensitivityTimeout(Process *p, ::sc_core::sc_time t) :
Sensitivity(p), timeoutEvent([this]() { this->timeout(); })
{
scheduler.schedule(&timeoutEvent, t);
}
SensitivityTimeout::~SensitivityTimeout()
{
if (timeoutEvent.scheduled())
scheduler.deschedule(&timeoutEvent);
}
void
SensitivityTimeout::timeout()
{
notify();
}
SensitivityEvent::SensitivityEvent(
Process *p, const ::sc_core::sc_event *e) : Sensitivity(p), event(e)
{
Event::getFromScEvent(event)->addSensitivity(this);
}
SensitivityEvent::~SensitivityEvent()
{
Event::getFromScEvent(event)->delSensitivity(this);
}
SensitivityEventAndList::SensitivityEventAndList(
Process *p, const ::sc_core::sc_event_and_list *list) :
Sensitivity(p), list(list), count(0)
{
for (auto e: list->events)
Event::getFromScEvent(e)->addSensitivity(this);
}
SensitivityEventAndList::~SensitivityEventAndList()
{
for (auto e: list->events)
Event::getFromScEvent(e)->delSensitivity(this);
}
void
SensitivityEventAndList::notifyWork(Event *e)
{
e->delSensitivity(this);
count++;
if (count == list->events.size())
process->satisfySensitivity(this);
}
SensitivityEventOrList::SensitivityEventOrList(
Process *p, const ::sc_core::sc_event_or_list *list) :
Sensitivity(p), list(list)
{
for (auto e: list->events)
Event::getFromScEvent(e)->addSensitivity(this);
}
SensitivityEventOrList::~SensitivityEventOrList()
{
for (auto e: list->events)
Event::getFromScEvent(e)->delSensitivity(this);
}
void
SensitivityTimeoutAndEventAndList::notifyWork(Event *e)
{
if (e) {
// An event went off which must be part of the sc_event_and_list.
SensitivityEventAndList::notifyWork(e);
} else {
// There's no inciting event, so this must be a timeout.
SensitivityTimeout::notifyWork(e);
}
}
class UnwindExceptionReset : public ::sc_core::sc_unwind_exception
{
public:
UnwindExceptionReset() { _isReset = true; }
};
class UnwindExceptionKill : public ::sc_core::sc_unwind_exception
{
public:
UnwindExceptionKill() {}
};
template <typename T>
struct BuiltinExceptionWrapper : public ExceptionWrapperBase
{
public:
T t;
void throw_it() override { throw t; }
};
BuiltinExceptionWrapper<UnwindExceptionReset> resetException;
BuiltinExceptionWrapper<UnwindExceptionKill> killException;
void
Process::forEachKid(const std::function<void(Process *)> &work)
{
for (auto &kid: get_child_objects()) {
Process *p_kid = dynamic_cast<Process *>(kid);
if (p_kid)
work(p_kid);
}
}
void
Process::suspend(bool inc_kids)
{
if (inc_kids)
forEachKid([](Process *p) { p->suspend(true); });
if (!_suspended) {
_suspended = true;
_suspendedReady = false;
}
if (procKind() != ::sc_core::SC_METHOD_PROC_ &&
scheduler.current() == this) {
scheduler.yield();
}
}
void
Process::resume(bool inc_kids)
{
if (inc_kids)
forEachKid([](Process *p) { p->resume(true); });
if (_suspended) {
_suspended = false;
if (_suspendedReady)
ready();
_suspendedReady = false;
}
}
void
Process::disable(bool inc_kids)
{
if (inc_kids)
forEachKid([](Process *p) { p->disable(true); });
if (!::sc_core::sc_allow_process_control_corners &&
dynamic_cast<SensitivityTimeout *>(dynamicSensitivity)) {
std::string message("attempt to disable a thread with timeout wait: ");
message += name();
SC_REPORT_ERROR("Undefined process control interaction",
message.c_str());
}
_disabled = true;
}
void
Process::enable(bool inc_kids)
{
if (inc_kids)
forEachKid([](Process *p) { p->enable(true); });
_disabled = false;
}
void
Process::kill(bool inc_kids)
{
// Propogate the kill to our children no matter what happens to us.
if (inc_kids)
forEachKid([](Process *p) { p->kill(true); });
// If we're in the middle of unwinding, ignore the kill request.
if (_isUnwinding)
return;
// Update our state.
terminate();
_isUnwinding = true;
// Make sure this process isn't marked ready
popListNode();
// Inject the kill exception into this process if it's started.
if (!_needsStart)
injectException(killException);
}
void
Process::reset(bool inc_kids)
{
// Propogate the reset to our children no matter what happens to us.
if (inc_kids)
forEachKid([](Process *p) { p->reset(true); });
// If we're in the middle of unwinding, ignore the reset request.
if (_isUnwinding)
return;
if (_needsStart) {
scheduler.runNow(this);
} else {
_isUnwinding = true;
injectException(resetException);
}
_resetEvent.notify();
}
void
Process::throw_it(ExceptionWrapperBase &exc, bool inc_kids)
{
if (inc_kids)
forEachKid([&exc](Process *p) { p->throw_it(exc, true); });
// Only inject an exception into threads that have started.
if (!_needsStart)
injectException(exc);
}
void
Process::injectException(ExceptionWrapperBase &exc)
{
excWrapper = &exc;
scheduler.runNow(this);
};
void
Process::syncResetOn(bool inc_kids)
{
if (inc_kids)
forEachKid([](Process *p) { p->syncResetOn(true); });
_syncReset = true;
}
void
Process::syncResetOff(bool inc_kids)
{
if (inc_kids)
forEachKid([](Process *p) { p->syncResetOff(true); });
_syncReset = false;
}
void
Process::dontInitialize()
{
scheduler.dontInitialize(this);
}
void
Process::finalize()
{
for (auto &s: pendingStaticSensitivities) {
s->finalize(staticSensitivities);
delete s;
s = nullptr;
}
pendingStaticSensitivities.clear();
};
void
Process::run()
{
bool reset;
do {
reset = false;
try {
func->call();
} catch(const ::sc_core::sc_unwind_exception &exc) {
reset = exc.is_reset();
_isUnwinding = false;
}
} while (reset);
needsStart(true);
}
void
Process::addStatic(PendingSensitivity *s)
{
pendingStaticSensitivities.push_back(s);
}
void
Process::setDynamic(Sensitivity *s)
{
delete dynamicSensitivity;
dynamicSensitivity = s;
}
void
Process::satisfySensitivity(Sensitivity *s)
{
// If there's a dynamic sensitivity and this wasn't it, ignore.
if (dynamicSensitivity && dynamicSensitivity != s)
return;
setDynamic(nullptr);
ready();
}
void
Process::ready()
{
if (disabled())
return;
if (suspended())
_suspendedReady = true;
else
scheduler.ready(this);
}
void
Process::lastReport(::sc_core::sc_report *report)
{
if (report) {
_lastReport = std::unique_ptr<::sc_core::sc_report>(
new ::sc_core::sc_report(*report));
} else {
_lastReport = nullptr;
}
}
::sc_core::sc_report *Process::lastReport() const { return _lastReport.get(); }
Process::Process(const char *name, ProcessFuncWrapper *func, bool _dynamic) :
::sc_core::sc_process_b(name), excWrapper(nullptr), func(func),
_needsStart(true), _dynamic(_dynamic), _isUnwinding(false),
_terminated(false), _suspended(false), _disabled(false),
_syncReset(false), refCount(0), stackSize(::Fiber::DefaultStackSize),
dynamicSensitivity(nullptr)
{
_newest = this;
}
void
Process::terminate()
{
_terminated = true;
_suspendedReady = false;
_suspended = false;
_syncReset = false;
delete dynamicSensitivity;
dynamicSensitivity = nullptr;
for (auto s: staticSensitivities)
delete s;
staticSensitivities.clear();
_terminatedEvent.notify();
}
Process *Process::_newest;
void
throw_it_wrapper(Process *p, ExceptionWrapperBase &exc, bool inc_kids)
{
p->throw_it(exc, inc_kids);
}
} // namespace sc_gem5
|