/*
* Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* 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 jdk.jfr.internal.instrument;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import jdk.internal.org.objectweb.asm.ClassReader;
import jdk.internal.org.objectweb.asm.ClassVisitor;
import jdk.internal.org.objectweb.asm.ClassWriter;
import jdk.internal.org.objectweb.asm.MethodVisitor;
import jdk.internal.org.objectweb.asm.Opcodes;
import jdk.internal.org.objectweb.asm.Type;
final class ConstructorTracerWriter extends ClassVisitor {
private ConstructorWriter useInputParameter, noUseInputParameter;
static byte[] generateBytes(Class<?> clz, byte[] oldBytes) throws IOException {
InputStream in = new ByteArrayInputStream(oldBytes);
ClassReader cr = new ClassReader(in);
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
ConstructorTracerWriter ctw = new ConstructorTracerWriter(cw, clz);
cr.accept(ctw, 0);
return cw.toByteArray();
}
private ConstructorTracerWriter(ClassVisitor cv, Class<?> classToChange) {
super(Opcodes.ASM7, cv);
useInputParameter = new ConstructorWriter(classToChange, true);
noUseInputParameter = new ConstructorWriter(classToChange, false);
}
private boolean isConstructor(String name) {
return name.equals("<init>");
}
private boolean takesStringParameter(String desc) {
Type[] types = Type.getArgumentTypes(desc);
if (types.length > 0 && types[0].getClassName().equals(String.class.getName())) {
return true;
}
return false;
}
@Override
public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
MethodVisitor mv = super.visitMethod(access, name, desc, signature, exceptions);
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