/*
* Copyright (c) 2015, 2020, 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
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package org.graalvm.compiler.hotspot;
import static org.graalvm.compiler.hotspot.HotSpotGraalOptionValues.GRAAL_OPTION_PROPERTY_PREFIX;
import static org.graalvm.compiler.hotspot.HotSpotGraalOptionValues.defaultOptions;
import static jdk.internal.vm.compiler.word.LocationIdentity.ANY_LOCATION;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.util.List;
import org.graalvm.compiler.core.common.SuppressFBWarnings;
import org.graalvm.compiler.debug.TTYStreamProvider;
import org.graalvm.compiler.options.Option;
import org.graalvm.compiler.options.OptionKey;
import org.graalvm.compiler.options.OptionType;
import org.graalvm.compiler.serviceprovider.GraalServices;
import org.graalvm.compiler.serviceprovider.IsolateUtil;
import org.graalvm.compiler.serviceprovider.ServiceProvider;
import org.graalvm.compiler.word.Word;
import jdk.internal.vm.compiler.word.Pointer;
import jdk.internal.vm.compiler.word.WordFactory;
import jdk.vm.ci.common.NativeImageReinitialize;
import jdk.vm.ci.hotspot.HotSpotJVMCIRuntime;
import jdk.vm.ci.services.Services;
@ServiceProvider(TTYStreamProvider.class)
public class HotSpotTTYStreamProvider implements TTYStreamProvider {
public static class Options {
// @formatter:off
@Option(help = "File to which logging is sent. A %p in the name will be replaced with a string identifying " +
"the process, usually the process id and %t will be replaced by System.currentTimeMillis(). " +
"If the current runtime is in an isolate, then %i will be replaced by '<isolate id>' " +
"otherwise %i is removed. An %I is the same as %i except that the replacement is " +
"'<isolate id>@<isolate address>'. " +
"Using %o as filename sends logging to System.out whereas %e sends logging to System.err.", type = OptionType.Expert)
public static final LogStreamOptionKey LogFile = new LogStreamOptionKey();
// @formatter:on
}
@Override
public PrintStream getStream() {
return Options.LogFile.getStream();
}
static {
Word.ensureInitialized();
}
Gets a pointer to a global word initialized to 0.
/**
* Gets a pointer to a global word initialized to 0.
*/
private static Pointer getBarrierPointer() {
// Substituted by Target_org_graalvm_compiler_hotspot_HotSpotTTYStreamProvider
return WordFactory.nullPointer();
}
Executes action. If barrier.isNonNull(), then barrier is used to ensure the action is executed exactly once in the process (i.e. synchronized across all threads and isolates) and that threads will block here until the action is guaranteed to have been executed. Note that each barrier is specific to a specific action and cannot be used for any other action. /**
* Executes {@code action}. If {@code barrier.isNonNull()}, then {@code barrier} is used to
* ensure the action is executed exactly once in the process (i.e. synchronized across all
* threads and isolates) and that threads will block here until the action is guaranteed to have
* been executed. Note that each {@code barrier} is specific to a specific {@code action} and
* cannot be used for any other action.
*/
private static boolean execute(Runnable action, Pointer barrier) {
if (barrier.isNull()) {
action.run();
return true;
}
final long initial = 0L;
final long executing = 1L;
final long executed = 2L;
while (true) {
long value = barrier.readLong(0);
if (value == initial) {
if (barrier.compareAndSwapLong(0, value, executing, ANY_LOCATION) == value) {
action.run();
barrier.writeLong(0, executed);
return true;
}
} else {
if (value == executed) {
return false;
}
try {
Thread.sleep(5);
} catch (InterruptedException e) {
}
value = barrier.readLong(0);
}
}
}
An option for a configurable file name that can also open a PrintStream on the file. If no value is given for the option, the stream will output to HotSpot's log stream /**
* An option for a configurable file name that can also open a {@link PrintStream} on the file.
* If no value is given for the option, the stream will output to HotSpot's
* {@link HotSpotJVMCIRuntime#getLogStream() log} stream
*/
private static class LogStreamOptionKey extends OptionKey<String> {
LogStreamOptionKey() {
super(null);
}
Returns: nameTemplate with all instances of %p replaced by GraalServices.getExecutionID() and %t by System.currentTimeMillis(). Checks %o and %e are not combined with any other characters.
/**
* @return {@code nameTemplate} with all instances of %p replaced by
* {@link GraalServices#getExecutionID()} and %t by
* {@link System#currentTimeMillis()}. Checks %o and %e are not combined with any
* other characters.
*/
private static String makeFilename(String nameTemplate) {
String name = nameTemplate;
if (name.contains("%p")) {
name = name.replace("%p", GraalServices.getExecutionID());
}
if (name.contains("%i")) {
name = name.replace("%i", IsolateUtil.getIsolateID(false));
}
if (name.contains("%I")) {
name = name.replace("%I", IsolateUtil.getIsolateID(true));
}
if (name.contains("%t")) {
name = name.replace("%t", String.valueOf(System.currentTimeMillis()));
}
for (String subst : new String[]{"%o", "%e"}) {
if (name.contains(subst) && !name.equals(subst)) {
throw new IllegalArgumentException("LogFile substitution " + subst + " cannot be combined with any other characters");
}
}
return name;
}
An output stream that redirects to HotSpotJVMCIRuntime.getLogStream(). The HotSpotJVMCIRuntime.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 HotSpotJVMCIRuntime#getLogStream()}. The
* {@link HotSpotJVMCIRuntime#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.
*/
class DelayedOutputStream extends OutputStream {
@NativeImageReinitialize private volatile OutputStream lazy;
private OutputStream lazy() throws FileNotFoundException {
if (lazy == null) {
synchronized (this) {
if (lazy == null) {
String nameTemplate = LogStreamOptionKey.this.getValue(defaultOptions());
if (nameTemplate != null) {
String name = makeFilename(nameTemplate);
switch (name) {
case "%o":
lazy = System.out;
break;
case "%e":
lazy = System.err;
break;
default:
boolean executed = execute(() -> {
File file = new File(name);
if (file.exists()) {
file.delete();
}
}, getBarrierPointer());
final boolean enableAutoflush = true;
FileOutputStream result = new FileOutputStream(name, true);
if (executed) {
printVMConfig(enableAutoflush, result);
}
lazy = result;
}
return lazy;
}
lazy = HotSpotJVMCIRuntime.runtime().getLogStream();
execute(() -> {
PrintStream ps = new PrintStream(lazy);
ps.printf("[Use -D%sLogFile=<path> to redirect Graal log output to a file.]%n", GRAAL_OPTION_PROPERTY_PREFIX);
ps.flush();
}, getBarrierPointer());
}
}
}
return lazy;
}
@SuppressFBWarnings(value = "DLS_DEAD_LOCAL_STORE", justification = "false positive on dead store to `ps`")
private void printVMConfig(final boolean enableAutoflush, FileOutputStream result) {
/*
* Add the JVM and Java arguments to the log file to help identity it.
*/
PrintStream ps = new PrintStream(result, enableAutoflush);
List<String> inputArguments = GraalServices.getInputArguments();
if (inputArguments != null) {
ps.println("VM Arguments: " + String.join(" ", inputArguments));
}
String cmd = Services.getSavedProperties().get("sun.java.command");
if (cmd != null) {
ps.println("sun.java.command=" + cmd);
}
}
@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 HotSpotJVMCIRuntime#getLogStream() log} stream.
*/
public PrintStream getStream() {
return new PrintStream(new DelayedOutputStream());
}
}
}