/* * Copyright © 2009 Reinier Zwitserloot and Roel Spilker. * * 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 lombok.eclipse.agent; import org.objectweb.asm.ClassAdapter; import org.objectweb.asm.ClassReader; import org.objectweb.asm.ClassVisitor; import org.objectweb.asm.ClassWriter; import org.objectweb.asm.FieldVisitor; import org.objectweb.asm.Opcodes; /** * Transforms Eclipse's <code>org.eclipse.jdt.internal.compiler.ast CompilationUnitDeclaration</code> class, * which is the top-level AST Node class for Eclipse. * * Transformations applied:<ul> * <li>A field is added: 'public transient Object $lombokAST = null;'. We use it to cache our own AST object, * usually of type <code>lombok.eclipse.EclipseAST.</code></li></ul> */ class EclipseCUDTransformer { byte[] transform(byte[] classfileBuffer) { ClassReader reader = new ClassReader(classfileBuffer); ClassWriter writer = new ClassWriter(reader, 0); ClassAdapter adapter = new CUDPatcherAdapter(writer); reader.accept(adapter, 0); return writer.toByteArray(); } private static class CUDPatcherAdapter extends ClassAdapter { CUDPatcherAdapter(ClassVisitor cv) { super(cv); } @Override public void visitEnd() { FieldVisitor fv = cv.visitField(Opcodes.ACC_PUBLIC | Opcodes.ACC_TRANSIENT, "$lombokAST", "Ljava/lang/Object;", null, null); fv.visitEnd(); cv.visitEnd(); } } }