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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "mtropolis/coroutine_exec.h"
#include "mtropolis/coroutines.h"
namespace MTropolis {
CoroutineRuntimeState::CoroutineRuntimeState(VThread *vthread, CoroutineStackFrame2 *frame)
: _vthread(vthread), _frame(frame), _condition(false) {
}
CompiledCoroutine::CompiledCoroutine()
: _frameConstructor(nullptr), _getFrameParameters(nullptr), _isVoidReturn(false), _instructions(nullptr), _numInstructions(0) {
}
CompiledCoroutine::~CompiledCoroutine() {
delete[] _instructions;
}
CoroutineStackFrame2::CoroutineStackFrame2(const CompiledCoroutine *compiledCoro)
: _compiledCoro(compiledCoro), _nextInstr(0) {
}
CoroutineStackFrame2::~CoroutineStackFrame2() {
}
VThreadState CoroutineStackFrame2::execute(VThread *thread) {
const CoroExecInstr *instrs = _compiledCoro->_instructions;
uint ip = _nextInstr;
CoroutineRuntimeState runtimeState(thread, this);
for (;;) {
assert(ip < _compiledCoro->_numInstructions);
const CoroExecInstr &instr = instrs[ip++];
switch (instr._opcode) {
case CoroExecOp::Code:
instr._func(runtimeState);
break;
case CoroExecOp::Jump:
ip = instr._arg;
break;
case CoroExecOp::JumpIfFalse:
if (!runtimeState._condition)
ip = instr._arg;
break;
case CoroExecOp::EnterFunction:
_nextInstr = ip;
return kVThreadReturn;
case CoroExecOp::ExitFunction:
thread->popFrame();
return kVThreadReturn;
case CoroExecOp::Error:
return kVThreadError;
case CoroExecOp::CheckMiniscript:
if (runtimeState._miniscriptOutcome == kMiniscriptInstructionOutcomeFailed)
return kVThreadError;
else if (runtimeState._miniscriptOutcome == kMiniscriptInstructionOutcomeContinue)
break;
else if (runtimeState._miniscriptOutcome == kMiniscriptInstructionOutcomeYieldToVThread) {
_nextInstr = ip;
return kVThreadReturn;
} else {
error("Unhandled miniscript result in coro runtime");
}
break;
default:
error("Internal error: Unhandled coro opcode");
}
}
}
const CompiledCoroutine *CoroutineStackFrame2::getCompiledCoroutine() const {
return _compiledCoro;
}
}
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