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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.lang.reflect.Method;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import jdk.internal.org.objectweb.asm.ClassVisitor;
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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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import jdk.internal.org.objectweb.asm.commons.RemappingMethodAdapter;
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import jdk.internal.org.objectweb.asm.commons.SimpleRemapper;
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import jdk.internal.org.objectweb.asm.tree.ClassNode;
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import jdk.internal.org.objectweb.asm.tree.MethodNode;
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import jdk.jfr.internal.LogLevel;
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import jdk.jfr.internal.LogTag;
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import jdk.jfr.internal.Logger;
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/**
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* This class will merge (some) methods from one class into another one.
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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 JIMethodMergeAdapter extends ClassVisitor {
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private final ClassNode cn;
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private final List<Method> methodFilter;
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private final Map<String, String> typeMap;
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/**
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* Methods in methodFilter that exist in cn will be merged into cv. If the method already exists,
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* the original method will be deleted.
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*
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* @param cv
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* @param cn - a ClassNode with Methods that will be merged into this class
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* @param methodFilter - only methods in this list will be merged
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* @param typeMappings - while merging, type references in the methods will be changed according to this map
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*/
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public JIMethodMergeAdapter(ClassVisitor cv, ClassNode cn, List<Method> methodFilter, JITypeMapping[] typeMappings) {
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super(Opcodes.ASM5, cv);
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this.cn = cn;
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this.methodFilter = methodFilter;
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this.typeMap = new HashMap<>();
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for (JITypeMapping tm : typeMappings) {
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typeMap.put(tm.from().replace('.', '/'), tm.to().replace('.', '/'));
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}
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}
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@Override
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public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
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super.visit(version, access, name, signature, superName, interfaces);
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typeMap.put(cn.name, name);
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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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if(methodInFilter(name, desc)) {
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// If the method is one that we will be replacing, delete the method
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Logger.log(LogTag.JFR_SYSTEM_BYTECODE, LogLevel.DEBUG, "Deleting " + name + desc);
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return null;
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}
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return super.visitMethod(access, name, desc, signature, exceptions);
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}
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@Override
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public void visitEnd() {
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SimpleRemapper remapper = new SimpleRemapper(typeMap);
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for (MethodNode mn : cn.methods) {
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// Check if the method is in the list of methods to copy
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if (methodInFilter(mn.name, mn.desc)) {
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Logger.log(LogTag.JFR_SYSTEM_BYTECODE, LogLevel.DEBUG, "Copying method: " + mn.name + mn.desc);
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Logger.log(LogTag.JFR_SYSTEM_BYTECODE, LogLevel.DEBUG, " with mapper: " + typeMap);
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String[] exceptions = new String[mn.exceptions.size()];
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mn.exceptions.toArray(exceptions);
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MethodVisitor mv = cv.visitMethod(mn.access, mn.name, mn.desc, mn.signature, exceptions);
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mn.instructions.resetLabels();
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mn.accept(new RemappingMethodAdapter(mn.access, mn.desc, mv, remapper));
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}
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}
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super.visitEnd();
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}
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private boolean methodInFilter(String name, String desc) {
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for(Method m : methodFilter) {
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if (m.getName().equals(name) && Type.getMethodDescriptor(m).equals(desc)) {
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return true;
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}
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}
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return false;
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}
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}
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