scouter.agent.asm.CapThisASM 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.agent.ClassDesc;
import scouter.agent.Configure;
import scouter.agent.asm.util.AsmUtil;
import scouter.agent.asm.util.HookingSet;
import scouter.agent.trace.TraceMain;
import scouter.org.objectweb.asm.ClassVisitor;
import scouter.org.objectweb.asm.MethodVisitor;
import scouter.org.objectweb.asm.Opcodes;
import java.util.List;
public class CapThisASM implements IASM, Opcodes {
private List< HookingSet> target = HookingSet.getHookingMethodSet(Configure.getInstance().hook_constructor_patterns);
public ClassVisitor transform(ClassVisitor cv, String className, ClassDesc classDesc) {
if (Configure.getInstance()._hook_cap_enabled == false) {
return cv;
}
for (int i = 0; i < target.size(); i++) {
HookingSet mset = target.get(i);
if (mset.classMatch.include(className)) {
return new CapThisCV(cv, mset, className);
}
}
return cv;
}
}
// ///////////////////////////////////////////////////////////////////////////
class CapThisCV extends ClassVisitor implements Opcodes {
private HookingSet mset;
private String className;
public CapThisCV(ClassVisitor cv, HookingSet mset, String className) {
super(ASM4, cv);
this.mset = mset;
this.className = className;
}
@Override
public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
MethodVisitor mv = super.visitMethod(access, name, desc, signature, exceptions);
if (mv == null || mset.isA(name, desc) == false) {
return mv;
}
return new CapThisMV(className, desc, mv);
}
}
// ///////////////////////////////////////////////////////////////////////////
class CapThisMV extends MethodVisitor implements Opcodes {
private static final String CLASS = TraceMain.class.getName().replace('.', '/');
private static final String METHOD = "capThis";
private static final String SIGNATURE = "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/Object;)V";
private String className;
private String methodDesc;
public CapThisMV(String classname, String methoddesc, MethodVisitor mv) {
super(ASM4, mv);
this.className = classname;
this.methodDesc = methoddesc;
}
@Override
public void visitInsn(int opcode) {
if ((opcode >= IRETURN && opcode <= RETURN) || opcode == ATHROW) {
AsmUtil.PUSH(mv, className);
AsmUtil.PUSH(mv, methodDesc);
mv.visitVarInsn(Opcodes.ALOAD, 0);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, CLASS, METHOD, SIGNATURE,false);
}
mv.visitInsn(opcode);
}
}