/*
* Copyright (c) 2008, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the Classpath exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package com.sun.btrace.runtime.instr;
import com.sun.btrace.runtime.Constants;
import static com.sun.btrace.org.objectweb.asm.Opcodes.*;
import com.sun.btrace.util.LocalVariableHelper;
/**
* This visitor helps in inserting code whenever an object
* is allocated. The code to insert on object alloc may be
* decided by derived class. By default, this class inserts
* code to print a message.
*
* @author A. Sundararajan
*/
public class ObjectAllocInstrumentor extends MethodInstrumentor {
private final boolean needsInitialization;
private boolean instanceCreated = false;
public ObjectAllocInstrumentor(LocalVariableHelper mv, String parentClz, String superClz,
int access, String name, String desc) {
this(mv, parentClz, superClz, access, name, desc, false);
}
public ObjectAllocInstrumentor(LocalVariableHelper mv, String parentClz, String superClz,
int access, String name, String desc, boolean needsInitialization) {
super(mv, parentClz, superClz, access, name, desc);
this.needsInitialization = needsInitialization;
}
@Override
public void visitTypeInsn(int opcode, String desc) {
if (opcode == NEW) {
beforeObjectNew(desc);
}
super.visitTypeInsn(opcode, desc);
if (opcode == NEW) {
if (needsInitialization) {
instanceCreated = true;
} else {
afterObjectNew(desc);
}
}
}
@Override
public void visitMethodInsn(int opcode, String owner, String name, String desc, boolean iface) {
super.visitMethodInsn(opcode, owner, name, desc, iface);
if (instanceCreated) {
if (Constants.CONSTRUCTOR.equals(name)) {
instanceCreated = false;
afterObjectNew(owner);
}
}
}
protected void beforeObjectNew(String desc) {}
protected void afterObjectNew(String desc) {}
}