src/jdk.jfr/share/classes/jdk/jfr/consumer/RecordedFrame.java
author egahlin
Mon, 08 Jul 2019 23:08:05 +0200
branchJEP-349-branch
changeset 57460 bcbc53560c77
parent 50113 caf115bb98ad
child 58112 e7754025004b
permissions -rw-r--r--
Reduce allocation rate by minimizing number of fields in RecordedEvent
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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.consumer;
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import java.lang.reflect.Modifier;
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import jdk.jfr.internal.Type;
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/**
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 * A recorded frame in a stack trace.
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 *
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 * @since 9
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 */
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public final class RecordedFrame extends RecordedObject {
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    static ObjectFactory<RecordedFrame> createFactory(Type type, TimeConverter timeConverter) {
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        return new ObjectFactory<RecordedFrame>(type, timeConverter) {
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            @Override
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            RecordedFrame createTyped(ObjectContext objectContext, long id, Object[] values) {
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                return new RecordedFrame(objectContext, values);
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            }
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        };
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    }
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    // package private
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    RecordedFrame(ObjectContext objectContext, Object[] objects) {
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        super(objectContext, objects);
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    }
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    /**
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     * Returns {@code true} if this is a Java frame, {@code false} otherwise.
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     * <p>
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     * A Java method that has a native modifier is considered a Java frame.
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     *
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     * @return {@code true} if this is a Java frame, {@code false} otherwise
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     *
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     * @see Modifier#isNative(int)
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     */
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    public boolean isJavaFrame() {
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        // Only Java frames exist today, but this allows
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        // API to be extended for native frame in the future.
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        if (hasField("javaFrame")) {
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            return getTyped("javaFrame", Boolean.class, Boolean.TRUE);
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        }
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        return true;
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    }
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    /**
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     * Returns the bytecode index for the execution point that is represented by
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     * this recorded frame.
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     *
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     * @return byte code index, or {@code -1} if doesn't exist
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     */
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    public int getBytecodeIndex() {
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        return getTyped("bytecodeIndex", Integer.class, Integer.valueOf(-1));
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    }
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    /**
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     * Returns the line number for the execution point that is represented by this
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     * recorded frame, or {@code -1} if doesn't exist
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     *
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     * @return the line number, or {@code -1} if doesn't exist
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     */
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    public int getLineNumber() {
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        return getTyped("lineNumber", Integer.class, Integer.valueOf(-1));
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    }
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    /**
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     * Returns the frame type for the execution point that is represented by this
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     * recorded frame (for example, {@code "Interpreted"}, {@code "JIT compiled"} or
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     * {@code "Inlined"}).
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     *
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     * @return the frame type, or {@code null} if doesn't exist
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     */
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    public String getType() {
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        return getTyped("type", String.class, null);
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    }
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    /**
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     * Returns the method for the execution point that is represented by this
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     * recorded frame.
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     *
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     * @return the method, not {@code null}
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     */
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    public RecordedMethod getMethod() {
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        return getTyped("method", RecordedMethod.class, null);
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    }
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}