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/*
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* Copyright (c) 2016, 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;
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import java.io.ByteArrayOutputStream;
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import java.io.PrintWriter;
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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.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.Method;
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import jdk.internal.org.objectweb.asm.util.TraceClassVisitor;
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import jdk.jfr.ValueDescriptor;
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import jdk.jfr.internal.EventInstrumentation.FieldInfo;
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final class ASMToolkit {
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private static Type TYPE_STRING = Type.getType(String.class);
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private static Type Type_THREAD = Type.getType(Thread.class);
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private static Type TYPE_CLASS = Type.getType(Class.class);
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public static void invokeSpecial(MethodVisitor methodVisitor, String className, Method m) {
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methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, className, m.getName(), m.getDescriptor(), false);
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}
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public static void invokeStatic(MethodVisitor methodVisitor, String className, Method m) {
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methodVisitor.visitMethodInsn(Opcodes.INVOKESTATIC, className, m.getName(), m.getDescriptor(), false);
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}
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public static void invokeVirtual(MethodVisitor methodVisitor, String className, Method m) {
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methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, className, m.getName(), m.getDescriptor(), false);
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}
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public static Type toType(ValueDescriptor v) {
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String typeName = v.getTypeName();
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switch (typeName) {
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case "byte":
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return Type.BYTE_TYPE;
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case "short":
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return Type.SHORT_TYPE;
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case "int":
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return Type.INT_TYPE;
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case "long":
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return Type.LONG_TYPE;
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case "double":
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return Type.DOUBLE_TYPE;
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case "float":
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return Type.FLOAT_TYPE;
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case "char":
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return Type.CHAR_TYPE;
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case "boolean":
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return Type.BOOLEAN_TYPE;
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case "java.lang.String":
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return TYPE_STRING;
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case "java.lang.Thread":
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return Type_THREAD;
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case "java.lang.Class":
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return TYPE_CLASS;
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}
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// Add support for SettingControl?
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throw new Error("Not a valid type " + v.getTypeName());
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}
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/**
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* Converts "int" into "I" and "java.lang.String" into "Ljava/lang/String;"
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*
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* @param typeName
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* type
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*
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* @return descriptor
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*/
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public static String getDescriptor(String typeName) {
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if ("int".equals(typeName)) {
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return "I";
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}
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if ("long".equals(typeName)) {
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return "J";
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}
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if ("boolean".equals(typeName)) {
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return "Z";
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}
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if ("float".equals(typeName)) {
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return "F";
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}
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if ("double".equals(typeName)) {
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return "D";
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}
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if ("short".equals(typeName)) {
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return "S";
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}
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if ("char".equals(typeName)) {
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return "C";
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}
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if ("byte".equals(typeName)) {
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return "B";
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}
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String internal = getInternalName(typeName);
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return Type.getObjectType(internal).getDescriptor();
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}
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/**
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* Converts java.lang.String into java/lang/String
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*
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* @param className
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*
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* @return internal name
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*/
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public static String getInternalName(String className) {
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return className.replace(".", "/");
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}
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public static Method makeWriteMethod(List<FieldInfo> fields) {
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StringBuilder sb = new StringBuilder();
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sb.append("(");
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for (FieldInfo v : fields) {
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if (!v.fieldName.equals(EventInstrumentation.FIELD_EVENT_THREAD) && !v.fieldName.equals(EventInstrumentation.FIELD_STACK_TRACE)) {
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sb.append(v.fieldDescriptor);
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}
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}
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sb.append(")V");
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return new Method("write", sb.toString());
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}
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public static void logASM(String className, byte[] bytes) {
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Logger.log(LogTag.JFR_SYSTEM_BYTECODE, LogLevel.INFO, "Generated bytecode for class " + className);
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Logger.log(LogTag.JFR_SYSTEM_BYTECODE, LogLevel.TRACE, () -> {
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ClassReader cr = new ClassReader(bytes);
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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PrintWriter w = new PrintWriter(baos);
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w.println("Bytecode:");
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cr.accept(new TraceClassVisitor(w), 0);
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return baos.toString();
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});
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}
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}
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