74 lines
2.6 KiB
Java
74 lines
2.6 KiB
Java
/*
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* Minecraft Forge
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* Copyright (c) 2016-2019.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation version 2.1
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* of the License.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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package net.minecraftforge.common.asm;
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import java.nio.file.Path;
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import java.util.List;
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import org.objectweb.asm.Opcodes;
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import org.objectweb.asm.Type;
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import org.objectweb.asm.tree.AnnotationNode;
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import org.objectweb.asm.tree.ClassNode;
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import cpw.mods.modlauncher.serviceapi.ILaunchPluginService;
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/**
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* Removes the final modifier from fields with the @CapabilityInject annotation, prevents the JITer from in lining them so our runtime replacements can work.
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*/
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public class CapabilityInjectDefinalize implements ILaunchPluginService {
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private final String CAP = "Lnet/minecraftforge/common/capabilities/Capability;"; //Don't directly reference this to prevent class loading.
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private final String CAP_INJECT = "Lnet/minecraftforge/common/capabilities/CapabilityInject;"; //Don't directly reference this to prevent class loading.
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@Override
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public String name() {
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return "capability_inject_definalize";
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}
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@Override public void addResource(Path resource, String name) { }
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@Override public <T> T getExtension() { return null; } // ?
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@Override
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public boolean handlesClass(Type classType, boolean isEmpty)
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{
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return !isEmpty; //Check for annotations?
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}
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private boolean hasHolder(List<AnnotationNode> lst)
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{
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return lst != null && lst.stream().anyMatch(n -> n.desc.equals(CAP_INJECT));
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}
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@Override
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public ClassNode processClass(ClassNode classNode, Type classType)
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{
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final int flags = Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC | Opcodes.ACC_FINAL;
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classNode.fields.stream().filter(f -> ((f.access & flags) == flags) && f.desc.equals(CAP) && hasHolder(f.visibleAnnotations)).forEach(f ->
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{
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f.access &= ~Opcodes.ACC_FINAL; //Strip final
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f.access |= Opcodes.ACC_SYNTHETIC; //Add Synthetic so we can check in runtime.
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});
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return classNode;
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}
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}
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