cpw.mods.fml.common.discovery.asm.ModMethodVisitor.java Source code

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Here is the source code for cpw.mods.fml.common.discovery.asm.ModMethodVisitor.java

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/*
 * Forge Mod Loader
 * Copyright (c) 2012-2013 cpw.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser Public License v2.1
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * 
 * Contributors:
 *     cpw - implementation
 */

package cpw.mods.fml.common.discovery.asm;

import java.util.LinkedList;

import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;

import com.google.common.collect.Lists;

public class ModMethodVisitor extends MethodVisitor {

    private ASMModParser discoverer;
    private boolean inCode;
    private LinkedList<Label> labels = Lists.newLinkedList();
    private String foundProperties;
    private boolean validProperties;

    public ModMethodVisitor(String name, ASMModParser discoverer) {
        super(Opcodes.ASM4);
        this.discoverer = discoverer;
    }

    @Override
    public void visitCode() {
        labels.clear();
    }

    @Override
    public void visitLdcInsn(Object cst) {
        if (cst instanceof String && labels.size() == 1) {
            foundProperties = (String) cst;
        }
    }

    @Override
    public void visitInsn(int opcode) {
        if (Opcodes.ARETURN == opcode && labels.size() == 1 && foundProperties != null) {
            validProperties = true;
        }
    }

    @Override
    public void visitLabel(Label label) {
        labels.push(label);
    }

    @Override
    public void visitEnd() {
        if (validProperties) {
            discoverer.setBaseModProperties(foundProperties);
        }
    }
}