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Fabric Mixin is a trait/mixin and bytecode weaving framework for Java using ASM.
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/*
 * This file is part of Mixin, licensed under the MIT License (MIT).
 *
 * Copyright (c) SpongePowered 
 * Copyright (c) contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.spongepowered.asm.mixin.transformer;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.objectweb.asm.ClassReader;
import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.tree.MethodNode;

import org.spongepowered.asm.mixin.transformer.MixinConfig.IListener;
import org.spongepowered.asm.util.Bytecode;

public enum MixinInheritanceTracker implements IListener {
    INSTANCE;

    @Override
    public void onPrepare(MixinInfo mixin) {
    }

    @Override
    public void onInit(MixinInfo mixin) {
        ClassInfo mixinInfo = mixin.getClassInfo();
        assert mixinInfo.isMixin(); //The mixin should certainly be a mixin

        for (ClassInfo superType = mixinInfo.getSuperClass(); superType != null && superType.isMixin(); superType = superType.getSuperClass()) {
            List children = parentMixins.get(superType.getName());

            if (children == null) {
                parentMixins.put(superType.getName(), children = new ArrayList());
            }

            children.add(mixin);
        }
    }

    public List findOverrides(ClassInfo owner, String name, String desc) {
        return findOverrides(owner.getName(), name, desc);
    }

    public List findOverrides(String owner, String name, String desc) {
        List children = parentMixins.get(owner);
        if (children == null) {
            return Collections.emptyList();
        }

        List out = new ArrayList(children.size());

        for (MixinInfo child : children) {
            ClassNode node = child.getClassNode(ClassReader.SKIP_DEBUG | ClassReader.SKIP_FRAMES);

            MethodNode method = Bytecode.findMethod(node, name, desc);
            if (method == null || Bytecode.isStatic(method)) {
                continue;
            }

            switch (Bytecode.getVisibility(method)) {
            case PRIVATE:
                break;

            case PACKAGE:
                int ownerSplit = owner.lastIndexOf('/');
                int childSplit = node.name.lastIndexOf('/');
                //There is a reasonable chance mixins are in the same package, so it is viable that a package private method is overridden
                if (ownerSplit != childSplit || (ownerSplit > 0 && !owner.regionMatches(0, node.name, 0, ownerSplit + 1))) {
                    break;
                }

                out.add(method);
                break;
            default:
                out.add(method);
                break;
            }
        }

        return out.isEmpty() ? Collections.emptyList() : out;
    }

    private final Map> parentMixins = new HashMap>();
}