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TreeTransformer.java
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TreeTransformer.java
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/*
* This file is part of Mixin, licensed under the MIT License (MIT).
*
* Copyright (c) SpongePowered <https://www.spongepowered.org>
* 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.transformers;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.tree.ClassNode;
import org.spongepowered.asm.service.ILegacyClassTransformer;
/**
* Base class for transformers which work with ASM tree model
*/
public abstract class TreeTransformer implements ILegacyClassTransformer {
private ClassReader classReader;
private ClassNode classNode;
/**
* @param basicClass Original bytecode
* @return tree
*/
protected final ClassNode readClass(String className, byte[] basicClass) {
return this.readClass(className, basicClass, true);
}
/**
* @param basicClass Original bytecode
* @param cacheReader True to cache the classReader instance for use when
* writing the generated ClassNode later
* @return tree
*/
protected final ClassNode readClass(String className, byte[] basicClass, boolean cacheReader) {
ClassReader classReader = new MixinClassReader(basicClass, className);
if (cacheReader) {
this.classReader = classReader;
}
ClassNode classNode = new ClassNode();
classReader.accept(classNode, ClassReader.EXPAND_FRAMES);
return classNode;
}
/**
* @param classNode ClassNode to write out
* @return generated bytecode
*/
protected final byte[] writeClass(ClassNode classNode) {
// Use optimised writer for speed
if (this.classReader != null && this.classNode == classNode) {
this.classNode = null;
ClassWriter writer = new MixinClassWriter(this.classReader, ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
this.classReader = null;
classNode.accept(writer);
return writer.toByteArray();
}
this.classNode = null;
ClassWriter writer = new MixinClassWriter(ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
classNode.accept(writer);
return writer.toByteArray();
}
}