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* Version: EPL 2.0/GPL 2.0/LGPL 2.1
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* except in compliance with the License. You may obtain a copy of
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package org.jruby.util;
import org.objectweb.asm.ClassWriter;
ASM helpers for JRuby.
Author: kares
/**
* ASM helpers for JRuby.
*
* @author kares
*/
public abstract class ASM {
private ASM() { /* no instances */ }
public static ClassWriter newClassWriter() {
return new ClassWriter(ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
}
public static ClassWriter newClassWriter(ClassLoader loader) {
return newClassWriter(loader, ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
}
public static ClassWriter newClassWriter(ClassLoader loader, final int flags) {
return new ClassLoaderAwareWriter(loader, flags);
}
NOTE: required to account for ASM calculating stack-map frames
in which case it might need to know of JRuby's dynamically loaded classes
Author: kares
/**
* NOTE: required to account for ASM calculating stack-map frames
* in which case it might need to know of JRuby's dynamically loaded classes
*
* @author kares
*/
private static class ClassLoaderAwareWriter extends ClassWriter {
private final ClassLoader loader;
ClassLoaderAwareWriter(final ClassLoader loader, final int flags) {
super(flags);
this.loader = loader != null ? loader : ASM.class.getClassLoader();
}
@Override
protected String getCommonSuperClass(String type1, String type2) {
try {
return getCommonSuperClassImpl(type1, type2, loader);
}
catch (TypeNotPresentException ex) {
throw ex;
}
}
private static String getCommonSuperClassImpl(String type1, String type2, final ClassLoader loader)
throws TypeNotPresentException {
Class<?> class1;
try {
class1 = Class.forName(type1.replace('/', '.'), false, loader);
}
catch (ClassNotFoundException|Error e) {
throw new TypeNotPresentException(type1, e);
}
Class<?> class2;
try {
class2 = Class.forName(type2.replace('/', '.'), false, loader);
}
catch (ClassNotFoundException|Error e) {
throw new TypeNotPresentException(type2, e);
}
if (class1.isAssignableFrom(class2)) {
return type1;
}
if (class2.isAssignableFrom(class1)) {
return type2;
}
if (class1.isInterface() || class2.isInterface()) {
return "java/lang/Object";
}
do {
class1 = class1.getSuperclass();
}
while (!class1.isAssignableFrom(class2));
return class1.getName().replace('.', '/');
}
}
}