| /* |
| * Copyright (c) 2016, 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.core.common.util; |
| |
| import org.graalvm.compiler.debug.Assertions; |
| import org.graalvm.compiler.options.Option; |
| import org.graalvm.compiler.options.OptionKey; |
| import org.graalvm.compiler.options.OptionType; |
| import org.graalvm.compiler.options.OptionValues; |
| |
| /** |
| * Utility class that allows the compiler to monitor compilations that take a very long time. |
| */ |
| public final class CompilationAlarm implements AutoCloseable { |
| |
| public static class Options { |
| // @formatter:off |
| @Option(help = "Time limit in seconds before a compilation expires (0 to disable the limit). " + |
| "The compilation alarm will be implicitly disabled if assertions are enabled.", type = OptionType.Debug) |
| public static final OptionKey<Integer> CompilationExpirationPeriod = new OptionKey<>(300); |
| // @formatter:on |
| } |
| |
| private CompilationAlarm(long expiration) { |
| this.expiration = expiration; |
| } |
| |
| /** |
| * Thread local storage for the active compilation alarm. |
| */ |
| private static final ThreadLocal<CompilationAlarm> currentAlarm = new ThreadLocal<>(); |
| |
| private static final CompilationAlarm NEVER_EXPIRES = new CompilationAlarm(0); |
| |
| /** |
| * Gets the current compilation alarm. If there is no current alarm, a non-null value is |
| * returned that will always return {@code false} for {@link #hasExpired()}. |
| */ |
| public static CompilationAlarm current() { |
| CompilationAlarm alarm = currentAlarm.get(); |
| return alarm == null ? NEVER_EXPIRES : alarm; |
| } |
| |
| /** |
| * Determines if this alarm has expired. A compilation expires if it takes longer than |
| * {@linkplain CompilationAlarm.Options#CompilationExpirationPeriod}. |
| * |
| * @return {@code true} if the current compilation already takes longer than |
| * {@linkplain CompilationAlarm.Options#CompilationExpirationPeriod}, {@code false} |
| * otherwise |
| */ |
| public boolean hasExpired() { |
| return this != NEVER_EXPIRES && System.currentTimeMillis() > expiration; |
| } |
| |
| @Override |
| public void close() { |
| if (this != NEVER_EXPIRES) { |
| currentAlarm.set(null); |
| } |
| } |
| |
| /** |
| * The time at which this alarm expires. |
| */ |
| private final long expiration; |
| |
| /** |
| * Starts an alarm for setting a time limit on a compilation if there isn't already an active |
| * alarm, if assertions are disabled and |
| * {@link CompilationAlarm.Options#CompilationExpirationPeriod}{@code > 0}. The returned value |
| * can be used in a try-with-resource statement to disable the alarm once the compilation is |
| * finished. |
| * |
| * @return a {@link CompilationAlarm} if there was no current alarm for the calling thread |
| * before this call otherwise {@code null} |
| */ |
| public static CompilationAlarm trackCompilationPeriod(OptionValues options) { |
| int period = Assertions.assertionsEnabled() ? 0 : Options.CompilationExpirationPeriod.getValue(options); |
| if (period > 0) { |
| CompilationAlarm current = currentAlarm.get(); |
| if (current == null) { |
| long expiration = System.currentTimeMillis() + period * 1000; |
| current = new CompilationAlarm(expiration); |
| currentAlarm.set(current); |
| return current; |
| } |
| } |
| return null; |
| } |
| |
| } |