/*
* 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.InstrumentUtils;
import static com.sun.btrace.org.objectweb.asm.Opcodes.*;
import com.sun.btrace.util.LocalVariableHelper;
/**
* This visitor helps in inserting code whenever an array
* is allocated. The code to insert on method entry may be
* decided by derived class. By default, this class inserts
* code to print allocated array objects.
*
* @author A. Sundararajan
*/
public class ArrayAllocInstrumentor extends MethodInstrumentor {
public ArrayAllocInstrumentor(LocalVariableHelper mv, String parentClz, String superClz,
int access, String name, String desc) {
super(mv, parentClz, superClz, access, name, desc);
}
@Override
public void visitIntInsn(int opcode, int operand) {
String desc = null;
if (opcode == NEWARRAY) {
desc = InstrumentUtils.arrayDescriptorFor(operand);
onBeforeArrayNew(getPlainType(desc), 1);
}
super.visitIntInsn(opcode, operand);
if (opcode == NEWARRAY) {
onAfterArrayNew(getPlainType(desc), 1);
}
}
@Override
public void visitTypeInsn(int opcode, String desc) {
if (opcode == ANEWARRAY) {
onBeforeArrayNew("L" + desc + ";", 1);
}
super.visitTypeInsn(opcode, desc);
if (opcode == ANEWARRAY) {
onAfterArrayNew("L" + desc + ";", 1);
}
}
@Override
public void visitMultiANewArrayInsn(String desc, int dims) {
String type = getPlainType(desc);
onBeforeArrayNew(type, dims);
super.visitMultiANewArrayInsn(desc, dims);
onAfterArrayNew(type, dims);
}
protected void onBeforeArrayNew(String desc, int dims) {
asm.println("before allocating " + desc);
}
protected void onAfterArrayNew(String desc, int dims) {
asm.dup()
.printObject();
}
private String getPlainType(String desc) {
int index = desc.lastIndexOf('[') + 1;
if (index > 0) {
return desc.substring(index);
}
return desc;
}
}