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