107 lines
4.0 KiB
Java
107 lines
4.0 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 @ObjectHolder annotation, prevents the JITer from in lining them so our runtime replacements can work.
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* Will also de-finalize all fields in on class level annotations.
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*/
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public class ObjectHolderDefinalize implements ILaunchPluginService {
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private final String OBJECT_HOLDER = "Lnet/minecraftforge/registries/ObjectHolder;"; //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 "object_holder_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(OBJECT_HOLDER));
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}
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private String getValue(List<AnnotationNode> lst)
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{
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AnnotationNode ann = lst.stream().filter(n -> n.desc.equals(OBJECT_HOLDER)).findFirst().get();
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if (ann.values != null)
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{
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for (int x = 0; x < ann.values.size() - 1; x += 2) {
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if (ann.values.get(x).equals("value")) {
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return (String)ann.values.get(x + 1);
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}
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}
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}
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return null;
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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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//Must be public static finals, and non-array objects
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final int flags = Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC | Opcodes.ACC_FINAL;
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//Fix Annotated Fields before injecting from class level
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classNode.fields.stream().filter(f -> ((f.access & flags) == flags) && f.desc.startsWith("L") && 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. ? Good idea?
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});
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if (hasHolder(classNode.visibleAnnotations)) //Class level, de-finalize all fields and add @ObjectHolder to them!
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{
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@SuppressWarnings("unused")
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String value = getValue(classNode.visibleAnnotations);
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classNode.fields.stream().filter(f -> ((f.access & flags) == flags) && f.desc.startsWith("L")).forEach(f ->
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{
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f.access &= ~Opcodes.ACC_FINAL;
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f.access |= Opcodes.ACC_SYNTHETIC;
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/*if (!hasHolder(f.visibleAnnotations)) //Add field level annotation, doesn't do anything until after we figure out how ASMDataTable is gatherered
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{
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if (value == null)
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f.visitAnnotation(OBJECT_HOLDER, true);
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else
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f.visitAnnotation(OBJECT_HOLDER, true).visit("value", value + ":" + f.name.toLowerCase());
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}*/
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});
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}
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return classNode;
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}
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}
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