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/*
* Copyright 2010-2012 VMware and contributors
*
* Licensed under the Apache 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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springsource.loaded;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
/**
* This is similar to SystemClassReflectionRewriter but this version just summarizes what it finds, rather than making any changes.
* Using the results of this we can determine whether it needs proper rewriting by the SystemClassReflectionRewriter (which would be
* done by adding this class to the list of those in the SLPP that should be processed like that).
*
* @author Andy Clement
* @since 0.7.3
*/
public class SystemClassReflectionInvestigator {
public static int investigate(String slashedClassName, byte[] bytes, boolean print) {
ClassReader fileReader = new ClassReader(bytes);
RewriteClassAdaptor classAdaptor = new RewriteClassAdaptor(print);
fileReader.accept(classAdaptor, ClassReader.SKIP_FRAMES);
return classAdaptor.hitCount;
}
static class RewriteClassAdaptor extends ClassVisitor implements Constants {
int hitCount = 0;
private ClassWriter cw;
int bits = 0x0000;
private boolean print;
private String classname;
private static boolean isInterceptable(String owner, String methodName) {
return MethodInvokerRewriter.RewriteClassAdaptor.intercepted.contains(owner + "." + methodName);
}
public RewriteClassAdaptor(boolean print) {
// TODO should it also compute frames?
super(ASM5,new ClassWriter(ClassWriter.COMPUTE_MAXS));
this.print = print;
cw = (ClassWriter) cv;
}
public byte[] getBytes() {
byte[] bytes = cw.toByteArray();
return bytes;
}
public int getBits() {
return bits;
}
@Override
public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
super.visit(version, access, name, signature, superName, interfaces);
this.classname = name;
}
@Override
public MethodVisitor visitMethod(int flags, String name, String descriptor, String signature, String[] exceptions) {
MethodVisitor mv = super.visitMethod(flags, name, descriptor, signature, exceptions);
return new RewritingMethodAdapter(mv);
}
class RewritingMethodAdapter extends MethodVisitor implements Opcodes, Constants {
public RewritingMethodAdapter(MethodVisitor mv) {
super(ASM5,mv);
}
private boolean interceptReflection(String owner, String name, String desc) {
if (isInterceptable(owner, name)) {
hitCount++;
if (print) {
System.out.println("SystemClassReflectionInvestigator: " + classname + " uses " + owner + "." + name + desc);
}
}
return false;
}
int unitializedObjectsCount = 0;
@Override
public void visitTypeInsn(final int opcode, final String type) {
if (opcode == NEW) {
unitializedObjectsCount++;
}
super.visitTypeInsn(opcode, type);
}
@Override
public void visitMethodInsn(final int opcode, final String owner, final String name, final String desc, final boolean itf) {
if (!GlobalConfiguration.interceptReflection || rewriteReflectiveCall(opcode, owner, name, desc)) {
return;
}
if (opcode == INVOKESPECIAL) {
unitializedObjectsCount--;
}
super.visitMethodInsn(opcode, owner, name, desc, itf);
}
/**
* Determine if a method call is a reflective call and an attempt should be made to rewrite it.
*
* @return true if the call was rewritten
*/
private boolean rewriteReflectiveCall(int opcode, String owner, String name, String desc) {
if (owner.length() > 10 && owner.charAt(8) == 'g'
&& (owner.startsWith("java/lang/reflect/") || owner.equals("java/lang/Class"))) {
boolean rewritten = interceptReflection(owner, name, desc);
if (rewritten) {
return true;
}
}
return false;
}
}
}
}
