| /* |
| * Copyright (c) 2013, 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. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.jfr.internal.instrument; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.lang.reflect.Method; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| 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.Opcodes; |
| import jdk.internal.org.objectweb.asm.tree.ClassNode; |
| import jdk.jfr.internal.SecuritySupport; |
| import jdk.jfr.internal.Utils; |
| |
| /** |
| * This class will perform byte code instrumentation given an "instrumentor" class. |
| * |
| * @see JITracer |
| * |
| * @author Staffan Larsen |
| */ |
| @Deprecated |
| final class JIClassInstrumentation { |
| private final Class<?> instrumentor; |
| private final String targetName; |
| private final String instrumentorName; |
| private final byte[] newBytes; |
| private final ClassReader targetClassReader; |
| private final ClassReader instrClassReader; |
| |
| /** |
| * Creates an instance and performs the instrumentation. |
| * |
| * @param instrumentor instrumentor class |
| * @param target target class |
| * @param old_target_bytes bytes in target |
| * |
| * @throws ClassNotFoundException |
| * @throws IOException |
| */ |
| JIClassInstrumentation(Class<?> instrumentor, Class<?> target, byte[] old_target_bytes) throws ClassNotFoundException, IOException { |
| instrumentorName = instrumentor.getName(); |
| this.targetName = target.getName(); |
| this.instrumentor = instrumentor; |
| this.targetClassReader = new ClassReader(old_target_bytes); |
| this.instrClassReader = new ClassReader(getOriginalClassBytes(instrumentor)); |
| this.newBytes = makeBytecode(); |
| Utils.writeGeneratedASM(target.getName(), newBytes); |
| } |
| |
| private static byte[] getOriginalClassBytes(Class<?> clazz) throws IOException { |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| String name = "/" + clazz.getName().replace(".", "/") + ".class"; |
| InputStream is = SecuritySupport.getResourceAsStream(name); |
| int bytesRead; |
| byte[] buffer = new byte[16384]; |
| while ((bytesRead = is.read(buffer, 0, buffer.length)) != -1) { |
| baos.write(buffer, 0, bytesRead); |
| } |
| baos.flush(); |
| is.close(); |
| return baos.toByteArray(); |
| } |
| |
| private byte[] makeBytecode() throws IOException, ClassNotFoundException { |
| |
| // Find the methods to instrument and inline |
| |
| final List<Method> instrumentationMethods = new ArrayList<>(); |
| for (final Method m : instrumentor.getDeclaredMethods()) { |
| JIInstrumentationMethod im = m.getAnnotation(JIInstrumentationMethod.class); |
| if (im != null) { |
| instrumentationMethods.add(m); |
| } |
| } |
| |
| // We begin by inlining the target's methods into the instrumentor |
| |
| ClassNode temporary = new ClassNode(); |
| ClassVisitor inliner = new JIInliner( |
| Opcodes.ASM5, |
| temporary, |
| targetName, |
| instrumentorName, |
| targetClassReader, |
| instrumentationMethods); |
| instrClassReader.accept(inliner, ClassReader.EXPAND_FRAMES); |
| |
| // Now we have the target's methods inlined into the instrumentation code (in 'temporary'). |
| // We now need to replace the target's method with the code in the |
| // instrumentation method. |
| |
| ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES); |
| JIMethodMergeAdapter ma = new JIMethodMergeAdapter( |
| cw, |
| temporary, |
| instrumentationMethods, |
| instrumentor.getAnnotationsByType(JITypeMapping.class)); |
| targetClassReader.accept(ma, ClassReader.EXPAND_FRAMES); |
| |
| return cw.toByteArray(); |
| } |
| |
| /** |
| * Get the instrumented byte codes that can be used to retransform the class. |
| * |
| * @return bytes |
| */ |
| public byte[] getNewBytes() { |
| return newBytes.clone(); |
| } |
| } |