87 lines
3.3 KiB
Java
87 lines
3.3 KiB
Java
/*
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* Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.jfr.internal.instrument;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import jdk.internal.org.objectweb.asm.ClassReader;
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import jdk.internal.org.objectweb.asm.ClassVisitor;
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import jdk.internal.org.objectweb.asm.ClassWriter;
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import jdk.internal.org.objectweb.asm.MethodVisitor;
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import jdk.internal.org.objectweb.asm.Opcodes;
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import jdk.internal.org.objectweb.asm.Type;
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final class ConstructorTracerWriter extends ClassVisitor {
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private ConstructorWriter useInputParameter, noUseInputParameter;
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static byte[] generateBytes(Class<?> clz, byte[] oldBytes) throws IOException {
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InputStream in = new ByteArrayInputStream(oldBytes);
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ClassReader cr = new ClassReader(in);
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ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
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ConstructorTracerWriter ctw = new ConstructorTracerWriter(cw, clz);
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cr.accept(ctw, 0);
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return cw.toByteArray();
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}
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private ConstructorTracerWriter(ClassVisitor cv, Class<?> classToChange) {
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super(Opcodes.ASM5, cv);
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useInputParameter = new ConstructorWriter(classToChange, true);
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noUseInputParameter = new ConstructorWriter(classToChange, false);
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}
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private boolean isConstructor(String name) {
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return name.equals("<init>");
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}
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private boolean takesStringParameter(String desc) {
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Type[] types = Type.getArgumentTypes(desc);
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if (types.length > 0 && types[0].getClassName().equals(String.class.getName())) {
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return true;
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}
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return false;
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}
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@Override
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public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
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MethodVisitor mv = super.visitMethod(access, name, desc, signature, exceptions);
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// Get a hold of the constructors that takes a String as a parameter
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if (isConstructor(name)) {
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if (takesStringParameter(desc)) {
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useInputParameter.setMethodVisitor(mv);
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return useInputParameter;
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}
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noUseInputParameter.setMethodVisitor(mv);
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return noUseInputParameter;
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}
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return mv;
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}
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}
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