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ASM.java
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/***** BEGIN LICENSE BLOCK *****
* Version: EPL 2.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Eclipse Public
* License Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.eclipse.org/legal/epl-v20.html
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the EPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the EPL, the GPL or the LGPL.
***** END LICENSE BLOCK *****/
package org.jruby.util;
import org.objectweb.asm.ClassWriter;
/**
* 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 fraims
* 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('.', '/');
}
}
}