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/*
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* Copyright (c) 2013, 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.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.lang.reflect.Method;
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import java.util.ArrayList;
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import java.util.List;
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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.Opcodes;
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import jdk.internal.org.objectweb.asm.tree.ClassNode;
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import jdk.jfr.internal.SecuritySupport;
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import jdk.jfr.internal.Utils;
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/**
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* This class will perform byte code instrumentation given an "instrumentor" class.
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*
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* @see JITracer
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*
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* @author Staffan Larsen
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*/
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@Deprecated
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final class JIClassInstrumentation {
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private final Class<?> instrumentor;
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private final String targetName;
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private final String instrumentorName;
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private final byte[] newBytes;
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private final ClassReader targetClassReader;
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private final ClassReader instrClassReader;
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/**
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* Creates an instance and performs the instrumentation.
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*
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* @param instrumentor instrumentor class
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* @param target target class
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* @param old_target_bytes bytes in target
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*
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* @throws ClassNotFoundException
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* @throws IOException
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*/
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JIClassInstrumentation(Class<?> instrumentor, Class<?> target, byte[] old_target_bytes) throws ClassNotFoundException, IOException {
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instrumentorName = instrumentor.getName();
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this.targetName = target.getName();
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this.instrumentor = instrumentor;
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this.targetClassReader = new ClassReader(old_target_bytes);
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this.instrClassReader = new ClassReader(getOriginalClassBytes(instrumentor));
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this.newBytes = makeBytecode();
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Utils.writeGeneratedASM(target.getName(), newBytes);
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}
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private static byte[] getOriginalClassBytes(Class<?> clazz) throws IOException {
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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String name = "/" + clazz.getName().replace(".", "/") + ".class";
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InputStream is = SecuritySupport.getResourceAsStream(name);
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int bytesRead;
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byte[] buffer = new byte[16384];
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while ((bytesRead = is.read(buffer, 0, buffer.length)) != -1) {
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baos.write(buffer, 0, bytesRead);
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}
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baos.flush();
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is.close();
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return baos.toByteArray();
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}
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private byte[] makeBytecode() throws IOException, ClassNotFoundException {
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// Find the methods to instrument and inline
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final List<Method> instrumentationMethods = new ArrayList<>();
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for (final Method m : instrumentor.getDeclaredMethods()) {
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JIInstrumentationMethod im = m.getAnnotation(JIInstrumentationMethod.class);
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if (im != null) {
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instrumentationMethods.add(m);
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}
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}
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// We begin by inlining the target's methods into the instrumentor
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ClassNode temporary = new ClassNode();
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ClassVisitor inliner = new JIInliner(
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Opcodes.ASM5,
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temporary,
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targetName,
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instrumentorName,
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targetClassReader,
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instrumentationMethods);
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instrClassReader.accept(inliner, ClassReader.EXPAND_FRAMES);
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// Now we have the target's methods inlined into the instrumentation code (in 'temporary').
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// We now need to replace the target's method with the code in the
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// instrumentation method.
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ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
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JIMethodMergeAdapter ma = new JIMethodMergeAdapter(
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cw,
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temporary,
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instrumentationMethods,
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instrumentor.getAnnotationsByType(JITypeMapping.class));
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targetClassReader.accept(ma, ClassReader.EXPAND_FRAMES);
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return cw.toByteArray();
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}
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/**
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* Get the instrumented byte codes that can be used to retransform the class.
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*
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* @return bytes
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*/
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public byte[] getNewBytes() {
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return newBytes.clone();
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}
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}
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