143 lines
3.9 KiB
Java
143 lines
3.9 KiB
Java
/*
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* The MIT License
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* Copyright © 2014-2019 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.bytecode;
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import java.util.Stack;
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/**
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* Implementation of virtual machine.
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*/
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public class VirtualMachine {
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private final Stack<Integer> stack = new Stack<>();
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private final Wizard[] wizards = new Wizard[2];
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/**
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* Constructor.
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*/
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public VirtualMachine() {
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for (var i = 0; i < wizards.length; i++) {
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wizards[i] = new Wizard();
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}
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}
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/**
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* Executes provided bytecode.
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*
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* @param bytecode to execute
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*/
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public void execute(int[] bytecode) {
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for (var i = 0; i < bytecode.length; i++) {
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Instruction instruction = Instruction.getInstruction(bytecode[i]);
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switch (instruction) {
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case LITERAL:
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// Read the next byte from the bytecode.
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int value = bytecode[++i];
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stack.push(value);
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break;
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case SET_AGILITY:
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var amount = stack.pop();
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var wizard = stack.pop();
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setAgility(wizard, amount);
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break;
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case SET_WISDOM:
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amount = stack.pop();
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wizard = stack.pop();
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setWisdom(wizard, amount);
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break;
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case SET_HEALTH:
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amount = stack.pop();
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wizard = stack.pop();
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setHealth(wizard, amount);
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break;
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case GET_HEALTH:
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wizard = stack.pop();
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stack.push(getHealth(wizard));
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break;
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case GET_AGILITY:
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wizard = stack.pop();
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stack.push(getAgility(wizard));
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break;
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case GET_WISDOM:
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wizard = stack.pop();
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stack.push(getWisdom(wizard));
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break;
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case ADD:
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var a = stack.pop();
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var b = stack.pop();
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stack.push(a + b);
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break;
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case DIVIDE:
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a = stack.pop();
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b = stack.pop();
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stack.push(b / a);
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break;
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case PLAY_SOUND:
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wizard = stack.pop();
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getWizards()[wizard].playSound();
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break;
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case SPAWN_PARTICLES:
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wizard = stack.pop();
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getWizards()[wizard].spawnParticles();
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break;
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default:
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throw new IllegalArgumentException("Invalid instruction value");
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}
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}
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}
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public Stack<Integer> getStack() {
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return stack;
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}
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public void setHealth(int wizard, int amount) {
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wizards[wizard].setHealth(amount);
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}
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public void setWisdom(int wizard, int amount) {
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wizards[wizard].setWisdom(amount);
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}
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public void setAgility(int wizard, int amount) {
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wizards[wizard].setAgility(amount);
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}
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public int getHealth(int wizard) {
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return wizards[wizard].getHealth();
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}
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public int getWisdom(int wizard) {
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return wizards[wizard].getWisdom();
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}
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public int getAgility(int wizard) {
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return wizards[wizard].getAgility();
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}
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public Wizard[] getWizards() {
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return wizards;
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}
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}
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