org.glassfish.pfl.objectweb.asm.optimizer.ClassOptimizer Maven / Gradle / Ivy
/***
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000-2007 INRIA, France Telecom
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.glassfish.pfl.objectweb.asm.optimizer;
import org.glassfish.pfl.objectweb.asm.AnnotationVisitor;
import org.glassfish.pfl.objectweb.asm.Attribute;
import org.glassfish.pfl.objectweb.asm.ClassAdapter;
import org.glassfish.pfl.objectweb.asm.ClassVisitor;
import org.glassfish.pfl.objectweb.asm.FieldVisitor;
import org.glassfish.pfl.objectweb.asm.MethodVisitor;
import org.glassfish.pfl.objectweb.asm.Opcodes;
import org.glassfish.pfl.objectweb.asm.commons.Remapper;
import org.glassfish.pfl.objectweb.asm.commons.RemappingClassAdapter;
/**
* A {@link ClassAdapter} that renames fields and methods, and removes debug
* info.
*
* @author Eric Bruneton
* @author Eugene Kuleshov
*/
public class ClassOptimizer extends RemappingClassAdapter {
private String pkgName;
public ClassOptimizer(final ClassVisitor cv, final Remapper remapper) {
super(cv, remapper);
}
// ------------------------------------------------------------------------
// Overridden methods
// ------------------------------------------------------------------------
public void visit(
final int version,
final int access,
final String name,
final String signature,
final String superName,
final String[] interfaces)
{
super.visit(version, access, name, null, superName, interfaces);
pkgName = name.substring(0, name.lastIndexOf('/'));
}
public void visitSource(final String source, final String debug) {
// remove debug info
}
public void visitOuterClass(
final String owner,
final String name,
final String desc)
{
// remove debug info
}
public AnnotationVisitor visitAnnotation(
final String desc,
final boolean visible)
{
// remove annotations
return null;
}
public void visitAttribute(final Attribute attr) {
// remove non standard attributes
}
public void visitInnerClass(
final String name,
final String outerName,
final String innerName,
final int access)
{
// remove debug info
}
public FieldVisitor visitField(
final int access,
final String name,
final String desc,
final String signature,
final Object value)
{
String s = remapper.mapFieldName(className, name, desc);
if ("-".equals(s)) {
return null;
}
if ((access & (Opcodes.ACC_PUBLIC | Opcodes.ACC_PROTECTED)) == 0) {
if ((access & Opcodes.ACC_FINAL) != 0
&& (access & Opcodes.ACC_STATIC) != 0 && desc.length() == 1)
{
return null;
}
if ("org/objectweb/asm".equals(pkgName) && s.equals(name)) {
System.out.println("INFO: " + s + " could be renamed");
}
super.visitField(access, name, desc, null, value);
} else {
if (!s.equals(name)) {
throw new RuntimeException("The public or protected field "
+ className + '.' + name + " must not be renamed.");
}
super.visitField(access, name, desc, null, value);
}
return null; // remove debug info
}
public MethodVisitor visitMethod(
final int access,
final String name,
final String desc,
final String signature,
final String[] exceptions)
{
String s = remapper.mapMethodName(className, name, desc);
if ("-".equals(s)) {
return null;
}
if ((access & (Opcodes.ACC_PUBLIC | Opcodes.ACC_PROTECTED)) == 0) {
if ("org/objectweb/asm".equals(pkgName) && !name.startsWith("<")
&& s.equals(name))
{
System.out.println("INFO: " + s + " could be renamed");
}
return super.visitMethod(access, name, desc, null, exceptions);
} else {
if (!s.equals(name)) {
throw new RuntimeException("The public or protected method "
+ className + '.' + name + desc
+ " must not be renamed.");
}
return super.visitMethod(access, name, desc, null, exceptions);
}
}
protected MethodVisitor createRemappingMethodAdapter(
int access,
String newDesc,
MethodVisitor mv)
{
return new MethodOptimizer(access, newDesc, mv, remapper);
}
}
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