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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.util.List;
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import java.util.concurrent.atomic.AtomicLong;
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import jdk.internal.org.objectweb.asm.AnnotationVisitor;
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import jdk.internal.org.objectweb.asm.ClassWriter;
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import jdk.internal.org.objectweb.asm.Label;
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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.GeneratorAdapter;
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import jdk.internal.org.objectweb.asm.commons.Method;
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import jdk.jfr.AnnotationElement;
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import jdk.jfr.Event;
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import jdk.jfr.ValueDescriptor;
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// Helper class for building dynamic events
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public final class EventClassBuilder {
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private static final Type TYPE_EVENT = Type.getType(Event.class);
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private static final Type TYPE_IOBE = Type.getType(IndexOutOfBoundsException.class);
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private static final Method DEFAULT_CONSTRUCTOR = Method.getMethod("void <init> ()");
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private static final Method SET_METHOD = Method.getMethod("void set (int, java.lang.Object)");
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private static final AtomicLong idCounter = new AtomicLong();
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private final ClassWriter classWriter = new ClassWriter(ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
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private final String fullClassName;
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private final Type type;
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private final List<ValueDescriptor> fields;
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private final List<AnnotationElement> annotationElements;
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public EventClassBuilder(List<AnnotationElement> annotationElements, List<ValueDescriptor> fields) {
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this.fullClassName = "jdk.jfr.DynamicEvent" + idCounter.incrementAndGet();
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this.type = Type.getType(fullClassName.replace(".", "/"));
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this.fields = fields;
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this.annotationElements = annotationElements;
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}
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public Class<? extends Event> build() {
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buildClassInfo();
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buildConstructor();
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buildFields();
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buildSetMethod();
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endClass();
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byte[] bytes = classWriter.toByteArray();
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ASMToolkit.logASM(fullClassName, bytes);
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return SecuritySupport.defineClass(type.getInternalName(), bytes, Event.class.getClassLoader()).asSubclass(Event.class);
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}
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private void endClass() {
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classWriter.visitEnd();
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}
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private void buildSetMethod() {
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GeneratorAdapter ga = new GeneratorAdapter(Opcodes.ACC_PUBLIC, SET_METHOD, null, null, classWriter);
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int index = 0;
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for (ValueDescriptor v : fields) {
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ga.loadArg(0);
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ga.visitLdcInsn(index);
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Label notEqual = new Label();
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ga.ifICmp(GeneratorAdapter.NE, notEqual);
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ga.loadThis();
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ga.loadArg(1);
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Type fieldType = ASMToolkit.toType(v);
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ga.unbox(ASMToolkit.toType(v));
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ga.putField(type, v.getName(), fieldType);
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ga.visitInsn(Opcodes.RETURN);
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ga.visitLabel(notEqual);
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index++;
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}
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ga.throwException(TYPE_IOBE, "Index must between 0 and " + fields.size());
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ga.endMethod();
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}
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private void buildConstructor() {
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MethodVisitor mv = classWriter.visitMethod(Opcodes.ACC_PUBLIC, DEFAULT_CONSTRUCTOR.getName(), DEFAULT_CONSTRUCTOR.getDescriptor(), null, null);
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mv.visitIntInsn(Opcodes.ALOAD, 0);
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ASMToolkit.invokeSpecial(mv, TYPE_EVENT.getInternalName(), DEFAULT_CONSTRUCTOR);
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mv.visitInsn(Opcodes.RETURN);
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mv.visitMaxs(0, 0);
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}
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private void buildClassInfo() {
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String internalSuperName = ASMToolkit.getInternalName(Event.class.getName());
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String internalClassName = type.getInternalName();
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classWriter.visit(52, Opcodes.ACC_PUBLIC + Opcodes.ACC_FINAL + Opcodes.ACC_SUPER, internalClassName, null, internalSuperName, null);
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for (AnnotationElement a : annotationElements) {
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String descriptor = ASMToolkit.getDescriptor(a.getTypeName());
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AnnotationVisitor av = classWriter.visitAnnotation(descriptor, true);
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for (ValueDescriptor v : a.getValueDescriptors()) {
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Object value = a.getValue(v.getName());
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String name = v.getName();
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if (v.isArray()) {
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AnnotationVisitor arrayVisitor = av.visitArray(name);
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Object[] array = (Object[]) value;
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for (int i = 0; i < array.length; i++) {
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arrayVisitor.visit(null, array[i]);
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}
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arrayVisitor.visitEnd();
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} else {
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av.visit(name, value);
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}
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}
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av.visitEnd();
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}
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}
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private void buildFields() {
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for (ValueDescriptor v : fields) {
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String internal = ASMToolkit.getDescriptor(v.getTypeName());
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classWriter.visitField(Opcodes.ACC_PRIVATE, v.getName(), internal, null, null);
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// No need to store annotations on field since they will be replaced anyway.
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}
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}
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}
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