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Diffstat (limited to 'src/systemc/core/process.cc')
| -rw-r--r-- | src/systemc/core/process.cc | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/src/systemc/core/process.cc b/src/systemc/core/process.cc new file mode 100644 index 000000000..4597d8b60 --- /dev/null +++ b/src/systemc/core/process.cc @@ -0,0 +1,208 @@ +/* + * 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" + +namespace sc_gem5 +{ + +class UnwindExceptionReset : public ::sc_core::sc_unwind_exception +{ + public: + const char *what() const throw() override { return "RESET"; } + bool is_reset() const override { return true; } +}; + +class UnwindExceptionKill : public ::sc_core::sc_unwind_exception +{ + public: + const char *what() const throw() override { return "KILL"; } + bool is_reset() const override { return false; } +}; + +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; + //TODO Suspend this process. + } + + if (procKind() != ::sc_core::SC_METHOD_PROC_ /* && we're running */) { + // We suspended this thread or cthread. Stop running. + } +} + +void +Process::resume(bool inc_kids) +{ + if (inc_kids) + forEachKid([](Process *p) { p->resume(true); }); + + if (_suspended) { + _suspended = false; + //TODO Resume this process. + } +} + +void +Process::disable(bool inc_kids) +{ + if (inc_kids) + forEachKid([](Process *p) { p->disable(true); }); + + _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) +{ + // Update our state. + _terminated = true; + _isUnwinding = true; + + // 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; + + // Inject the kill exception into this process. + injectException(killException); + + _terminatedEvent.notify(); +} + +void +Process::reset(bool inc_kids) +{ + // Update our state. + _isUnwinding = true; + + // 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; + + // Inject the reset exception into this process. + 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); }); +} + +void +Process::injectException(ExceptionWrapperBase &exc) +{ + excWrapper = &exc; + // Let this process preempt us. +}; + +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 +Thread::throw_it(ExceptionWrapperBase &exc, bool inc_kids) +{ + Process::throw_it(exc, inc_kids); + + if (_terminated) + return; + + injectException(exc); +} + +void +throw_it_wrapper(Process *p, ExceptionWrapperBase &exc, bool inc_kids) +{ + p->throw_it(exc, inc_kids); +} + +} // namespace sc_gem5 |