org.aspectj.weaver.bcel.asm.StackMapAdder Maven / Gradle / Ivy
/* *******************************************************************
* Copyright (c) 2008 Contributors
* All rights reserved.
* This program and the accompanying materials are made available
* under the terms of the Eclipse Public License v1.0
* which accompanies this distribution and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Andy Clement
* ******************************************************************/
package org.aspectj.weaver.bcel.asm;
import org.aspectj.weaver.ResolvedType;
import org.aspectj.weaver.UnresolvedType;
import org.aspectj.weaver.World;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassWriter;
/**
* Uses asm to add the stack map attribute to methods in a class. The class is passed in as pure byte data and then a reader/writer
* process it. The writer is wired into the world so that types can be resolved and getCommonSuperClass() can be implemented without
* class loading using the context class loader.
*
* @author Andy Clement
*/
public class StackMapAdder {
public static byte[] addStackMaps(World world, byte[] data) {
try {
ClassReader cr = new ClassReader(data);
ClassWriter cw = new AspectJConnectClassWriter(world);
cr.accept(cw, 0);
return cw.toByteArray();
} catch (Throwable t) {
System.err.println("AspectJ Internal Error: unable to add stackmap attributes. " + t.getMessage());
AsmDetector.isAsmAround = false;
return data;
}
}
private static class AspectJConnectClassWriter extends ClassWriter {
private final World world;
public AspectJConnectClassWriter(World w) {
super(ClassWriter.COMPUTE_FRAMES);
this.world = w;
}
// Implementation of getCommonSuperClass() that avoids Class.forName()
protected String getCommonSuperClass(final String type1, final String type2) {
ResolvedType resolvedType1 = world.resolve(UnresolvedType.forName(type1.replace('/', '.')));
ResolvedType resolvedType2 = world.resolve(UnresolvedType.forName(type2.replace('/', '.')));
if (resolvedType1.isAssignableFrom(resolvedType2)) {
return type1;
}
if (resolvedType2.isAssignableFrom(resolvedType1)) {
return type2;
}
if (resolvedType1.isInterface() || resolvedType2.isInterface()) {
return "java/lang/Object";
} else {
do {
resolvedType1 = resolvedType1.getSuperclass();
} while (!resolvedType1.isAssignableFrom(resolvedType2));
return resolvedType1.getName().replace('.', '/');
}
}
}
}