/*
* Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package org.graalvm.compiler.hotspot;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;
import org.graalvm.compiler.options.OptionValue;
import org.graalvm.compiler.options.UniquePathUtilities;
import jdk.vm.ci.hotspot.HotSpotJVMCIRuntime;
import jdk.vm.ci.hotspot.HotSpotJVMCIRuntimeProvider;
An option that encapsulates and configures a print stream.
/**
* An option that encapsulates and configures a print stream.
*/
public class PrintStreamOption extends OptionValue<String> {
public PrintStreamOption() {
super(null);
}
The print stream to which output will be written. Declared volatile to enable safe use of double-checked locking in getStream() and setValue(Object). /**
* The print stream to which output will be written.
*
* Declared {@code volatile} to enable safe use of double-checked locking in
* {@link #getStream()} and {@link #setValue(Object)}.
*/
private volatile PrintStream ps;
Replaces any instance of %p with an identifying name such as a process ID extracted from RuntimeMXBean.getName() and any instance of %t with the value of System.currentTimeMillis(). Returns: the name of the file to log to
/**
* Replaces any instance of %p with an identifying name such as a process ID extracted from
* {@link RuntimeMXBean#getName()} and any instance of %t with the value of
* {@link System#currentTimeMillis()}.
*
* @return the name of the file to log to
*/
private String getFilename() {
String name = getValue();
if (name.contains("%t")) {
name = name.replaceAll("%t", String.valueOf(UniquePathUtilities.getGlobalTimeStamp()));
}
if (name.contains("%p")) {
String runtimeName = ManagementFactory.getRuntimeMXBean().getName();
try {
int index = runtimeName.indexOf('@');
if (index != -1) {
long pid = Long.parseLong(runtimeName.substring(0, index));
runtimeName = Long.toString(pid);
}
name = name.replaceAll("%p", runtimeName);
} catch (NumberFormatException e) {
}
}
return name;
}
An output stream that redirects to HotSpotJVMCIRuntimeProvider.getLogStream(). The HotSpotJVMCIRuntimeProvider.getLogStream() value is only accessed the first time an IO operation is performed on the stream. This is required to break a deadlock in early JVMCI initialization. /**
* An output stream that redirects to {@link HotSpotJVMCIRuntimeProvider#getLogStream()}. The
* {@link HotSpotJVMCIRuntimeProvider#getLogStream()} value is only accessed the first time an
* IO operation is performed on the stream. This is required to break a deadlock in early JVMCI
* initialization.
*/
static class DelayedOutputStream extends OutputStream {
private volatile OutputStream lazy;
private OutputStream lazy() {
if (lazy == null) {
synchronized (this) {
if (lazy == null) {
lazy = HotSpotJVMCIRuntime.runtime().getLogStream();
}
}
}
return lazy;
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
lazy().write(b, off, len);
}
@Override
public void write(int b) throws IOException {
lazy().write(b);
}
@Override
public void flush() throws IOException {
lazy().flush();
}
@Override
public void close() throws IOException {
lazy().close();
}
}
Gets the print stream configured by this option. If no file is configured, the print stream will output to HotSpot's log stream. /**
* Gets the print stream configured by this option. If no file is configured, the print stream
* will output to HotSpot's {@link HotSpotJVMCIRuntimeProvider#getLogStream() log} stream.
*/
public PrintStream getStream() {
if (ps == null) {
if (getValue() != null) {
synchronized (this) {
if (ps == null) {
try {
final boolean enableAutoflush = true;
ps = new PrintStream(new FileOutputStream(getFilename()), enableAutoflush);
/*
* Add the JVM and Java arguments to the log file to help identity it.
*/
String inputArguments = String.join(" ", ManagementFactory.getRuntimeMXBean().getInputArguments());
ps.println("VM Arguments: " + inputArguments);
String cmd = System.getProperty("sun.java.command");
if (cmd != null) {
ps.println("sun.java.command=" + cmd);
}
} catch (FileNotFoundException e) {
throw new RuntimeException("couldn't open file: " + getValue(), e);
}
}
}
} else {
ps = new PrintStream(new DelayedOutputStream());
}
}
return ps;
}
@Override
public void setValue(Object v) {
if (ps != null) {
synchronized (this) {
if (ps != null) {
ps.close();
ps = null;
}
}
}
super.setValue(v);
}
}