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/*
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* Copyright (c) 2016, 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.
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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 org.graalvm.compiler.serviceprovider;
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import static java.lang.Thread.currentThread;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.Iterator;
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import java.util.List;
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import java.util.ServiceConfigurationError;
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import java.util.ServiceLoader;
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import java.util.concurrent.atomic.AtomicLong;
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import jdk.vm.ci.services.JVMCIPermission;
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import jdk.vm.ci.services.Services;
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/**
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* Interface to functionality that abstracts over which JDK version Graal is running on.
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*/
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public final class GraalServices {
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private static int getJavaSpecificationVersion() {
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String value = System.getProperty("java.specification.version");
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if (value.startsWith("1.")) {
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value = value.substring(2);
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}
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return Integer.parseInt(value);
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}
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/**
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* The integer value corresponding to the value of the {@code java.specification.version} system
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* property after any leading {@code "1."} has been stripped.
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*/
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public static final int JAVA_SPECIFICATION_VERSION = getJavaSpecificationVersion();
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/**
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* Determines if the Java runtime is version 8 or earlier.
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*/
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public static final boolean Java8OrEarlier = JAVA_SPECIFICATION_VERSION <= 8;
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private GraalServices() {
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}
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/**
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* Gets an {@link Iterable} of the providers available for a given service.
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*
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* @throws SecurityException if on JDK8 and a security manager is present and it denies
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* {@link JVMCIPermission}
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*/
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public static <S> Iterable<S> load(Class<S> service) {
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assert !service.getName().startsWith("jdk.vm.ci") : "JVMCI services must be loaded via " + Services.class.getName();
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Iterable<S> iterable = ServiceLoader.load(service);
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return new Iterable<>() {
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@Override
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public Iterator<S> iterator() {
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Iterator<S> iterator = iterable.iterator();
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return new Iterator<>() {
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@Override
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public boolean hasNext() {
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return iterator.hasNext();
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}
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@Override
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public S next() {
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S provider = iterator.next();
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// Allow Graal extensions to access JVMCI
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openJVMCITo(provider.getClass());
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return provider;
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}
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@Override
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public void remove() {
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iterator.remove();
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}
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};
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}
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};
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}
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/**
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* Opens all JVMCI packages to the module of a given class. This relies on JVMCI already having
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* opened all its packages to the module defining {@link GraalServices}.
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*
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* @param other all JVMCI packages will be opened to the module defining this class
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*/
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static void openJVMCITo(Class<?> other) {
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Module jvmciModule = JVMCI_MODULE;
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Module otherModule = other.getModule();
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if (jvmciModule != otherModule) {
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for (String pkg : jvmciModule.getPackages()) {
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if (!jvmciModule.isOpen(pkg, otherModule)) {
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jvmciModule.addOpens(pkg, otherModule);
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}
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}
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}
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}
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/**
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* Gets the provider for a given service for which at most one provider must be available.
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*
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* @param service the service whose provider is being requested
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* @param required specifies if an {@link InternalError} should be thrown if no provider of
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* {@code service} is available
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* @return the requested provider if available else {@code null}
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* @throws SecurityException if on JDK8 and a security manager is present and it denies
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* {@link JVMCIPermission}
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*/
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public static <S> S loadSingle(Class<S> service, boolean required) {
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assert !service.getName().startsWith("jdk.vm.ci") : "JVMCI services must be loaded via " + Services.class.getName();
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Iterable<S> providers = load(service);
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S singleProvider = null;
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try {
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for (Iterator<S> it = providers.iterator(); it.hasNext();) {
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singleProvider = it.next();
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if (it.hasNext()) {
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S other = it.next();
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throw new InternalError(String.format("Multiple %s providers found: %s, %s", service.getName(), singleProvider.getClass().getName(), other.getClass().getName()));
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}
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}
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} catch (ServiceConfigurationError e) {
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// If the service is required we will bail out below.
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}
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if (singleProvider == null) {
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if (required) {
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throw new InternalError(String.format("No provider for %s found", service.getName()));
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}
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}
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return singleProvider;
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}
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/**
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* Gets the class file bytes for {@code c}.
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*/
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public static InputStream getClassfileAsStream(Class<?> c) throws IOException {
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String classfilePath = c.getName().replace('.', '/') + ".class";
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return c.getModule().getResourceAsStream(classfilePath);
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}
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private static final Module JVMCI_MODULE = Services.class.getModule();
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/**
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* A JVMCI package dynamically exported to trusted modules.
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*/
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private static final String JVMCI_RUNTIME_PACKAGE = "jdk.vm.ci.runtime";
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static {
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assert JVMCI_MODULE.getPackages().contains(JVMCI_RUNTIME_PACKAGE);
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}
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/**
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* Determines if invoking {@link Object#toString()} on an instance of {@code c} will only run
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* trusted code.
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*/
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public static boolean isToStringTrusted(Class<?> c) {
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Module module = c.getModule();
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Module jvmciModule = JVMCI_MODULE;
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assert jvmciModule.getPackages().contains("jdk.vm.ci.runtime");
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if (module == jvmciModule || jvmciModule.isOpen(JVMCI_RUNTIME_PACKAGE, module)) {
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// Can access non-statically-exported package in JVMCI
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return true;
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}
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return false;
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}
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/**
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* Gets a unique identifier for this execution such as a process ID or a
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* {@linkplain #getGlobalTimeStamp() fixed timestamp}.
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*/
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public static String getExecutionID() {
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return Long.toString(ProcessHandle.current().pid());
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}
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private static final AtomicLong globalTimeStamp = new AtomicLong();
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/**
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* Gets a time stamp for the current process. This method will always return the same value for
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* the current VM execution.
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*/
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public static long getGlobalTimeStamp() {
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if (globalTimeStamp.get() == 0) {
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globalTimeStamp.compareAndSet(0, System.currentTimeMillis());
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}
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return globalTimeStamp.get();
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}
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/**
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* Returns an approximation of the total amount of memory, in bytes, allocated in heap memory
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* for the thread of the specified ID. The returned value is an approximation because some Java
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* virtual machine implementations may use object allocation mechanisms that result in a delay
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* between the time an object is allocated and the time its size is recorded.
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* <p>
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* If the thread of the specified ID is not alive or does not exist, this method returns
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* {@code -1}. If thread memory allocation measurement is disabled, this method returns
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* {@code -1}. A thread is alive if it has been started and has not yet died.
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* <p>
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* If thread memory allocation measurement is enabled after the thread has started, the Java
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* virtual machine implementation may choose any time up to and including the time that the
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* capability is enabled as the point where thread memory allocation measurement starts.
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*
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* @param id the thread ID of a thread
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* @return an approximation of the total memory allocated, in bytes, in heap memory for a thread
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* of the specified ID if the thread of the specified ID exists, the thread is alive,
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* and thread memory allocation measurement is enabled; {@code -1} otherwise.
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*
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* @throws IllegalArgumentException if {@code id} {@code <=} {@code 0}.
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* @throws UnsupportedOperationException if the Java virtual machine implementation does not
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* {@linkplain #isThreadAllocatedMemorySupported() support} thread memory allocation
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* measurement.
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*/
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public static long getThreadAllocatedBytes(long id) {
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JMXService jmx = JMXService.instance;
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if (jmx == null) {
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throw new UnsupportedOperationException();
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}
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return jmx.getThreadAllocatedBytes(id);
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}
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/**
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* Convenience method for calling {@link #getThreadAllocatedBytes(long)} with the id of the
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* current thread.
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*/
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public static long getCurrentThreadAllocatedBytes() {
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return getThreadAllocatedBytes(currentThread().getId());
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}
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/**
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* Returns the total CPU time for the current thread in nanoseconds. The returned value is of
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* nanoseconds precision but not necessarily nanoseconds accuracy. If the implementation
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* distinguishes between user mode time and system mode time, the returned CPU time is the
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* amount of time that the current thread has executed in user mode or system mode.
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*
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* @return the total CPU time for the current thread if CPU time measurement is enabled;
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* {@code -1} otherwise.
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*
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* @throws UnsupportedOperationException if the Java virtual machine does not
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* {@linkplain #isCurrentThreadCpuTimeSupported() support} CPU time measurement for
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* the current thread
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*/
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public static long getCurrentThreadCpuTime() {
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JMXService jmx = JMXService.instance;
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if (jmx == null) {
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throw new UnsupportedOperationException();
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}
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return jmx.getCurrentThreadCpuTime();
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}
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/**
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* Determines if the Java virtual machine implementation supports thread memory allocation
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* measurement.
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*/
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public static boolean isThreadAllocatedMemorySupported() {
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JMXService jmx = JMXService.instance;
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if (jmx == null) {
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return false;
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}
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return jmx.isThreadAllocatedMemorySupported();
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}
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/**
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* Determines if the Java virtual machine supports CPU time measurement for the current thread.
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*/
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public static boolean isCurrentThreadCpuTimeSupported() {
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JMXService jmx = JMXService.instance;
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if (jmx == null) {
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return false;
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}
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return jmx.isCurrentThreadCpuTimeSupported();
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}
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/**
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* Gets the input arguments passed to the Java virtual machine which does not include the
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* arguments to the {@code main} method. This method returns an empty list if there is no input
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* argument to the Java virtual machine.
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* <p>
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* Some Java virtual machine implementations may take input arguments from multiple different
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* sources: for examples, arguments passed from the application that launches the Java virtual
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* machine such as the 'java' command, environment variables, configuration files, etc.
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* <p>
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* Typically, not all command-line options to the 'java' command are passed to the Java virtual
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* machine. Thus, the returned input arguments may not include all command-line options.
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*
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* @return the input arguments to the JVM or {@code null} if they are unavailable
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*/
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public static List<String> getInputArguments() {
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JMXService jmx = JMXService.instance;
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if (jmx == null) {
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return null;
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}
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return jmx.getInputArguments();
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}
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}
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