scouter.agent.asm.AddFieldASM Maven / Gradle / Ivy
/*
* Copyright 2015 the original author or authors.
* @https://github.com/scouter-project/scouter
*
* 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 scouter.agent.asm;
import scouter.org.objectweb.asm.ClassVisitor;
import scouter.org.objectweb.asm.FieldVisitor;
import scouter.org.objectweb.asm.Opcodes;
import scouter.org.objectweb.asm.Type;
import scouter.agent.ClassDesc;
import scouter.agent.Configure;
import scouter.agent.Logger;
import scouter.agent.asm.util.HookingSet;
import java.util.Map;
public class AddFieldASM implements IASM, Opcodes {
public final Map target = HookingSet.getClassFieldSet(Configure.getInstance().hook_add_fields);
public AddFieldASM() {
}
Configure conf = Configure.getInstance();
public ClassVisitor transform(ClassVisitor cv, String className, ClassDesc classDesc) {
if (Configure.getInstance()._hook_async_enabled == false) {
return cv;
}
String field = target.get(className);
if (field != null) {
return new AddFieldCV(cv, className, field);
}
return cv;
}
}
class AddFieldCV extends ClassVisitor implements Opcodes {
private String field;
private String className;
public AddFieldCV(ClassVisitor cv, String className, String field) {
super(ASM5, cv);
this.field = field;
this.className = className;
}
boolean exist = false;
@Override
public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
super.visit(version, access, name, signature, superName, interfaces);
if (exist == false) {
super.visitField(ACC_PUBLIC, field, Type.getDescriptor(Object.class), null, null).visitEnd();
}
}
@Override
public FieldVisitor visitField(int access, String name, String desc, String signature, Object value) {
if (name.equals(field)) {
exist = true;
Logger.println("A901", "fail to add the field " + name + " on " + className);
}
return super.visitField(access, name, desc, signature, value);
}
}