--- /dev/null	2017-01-22 10:16:57.869617664 -0800
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/util/CompilationAlarm.java	2017-02-15 16:57:15.199075991 -0800
@@ -0,0 +1,113 @@
+/*
+ * 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.options.Option;
+import org.graalvm.compiler.options.OptionType;
+import org.graalvm.compiler.options.OptionValue;
+
+/**
+ * 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).", type = OptionType.Debug)
+        public static final OptionValue<Integer> CompilationExpirationPeriod = new OptionValue<>(300);
+        // @formatter:on
+    }
+
+    private CompilationAlarm() {
+    }
+
+    private static boolean enabled() {
+        return Options.CompilationExpirationPeriod.getValue() > 0;
+    }
+
+    /**
+     * Thread local storage for compilation start timestamps. Everytime a compiler thread calls
+     * {@link #trackCompilationPeriod()} it will save the start timestamp of the compilation.
+     */
+    private static final ThreadLocal<Long> compilationStartedTimeStamps = new ThreadLocal<>();
+
+    private static boolean compilationStarted() {
+        if (enabled()) {
+            Long start = compilationStartedTimeStamps.get();
+            if (start == null) {
+                compilationStartedTimeStamps.set(System.currentTimeMillis());
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private static void compilationFinished() {
+        if (enabled()) {
+            assert compilationStartedTimeStamps.get() != null;
+            compilationStartedTimeStamps.set(null);
+        }
+    }
+
+    /**
+     * Determines if the current compilation is 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 static boolean hasExpired() {
+        if (enabled()) {
+            Long start = compilationStartedTimeStamps.get();
+            if (start != null) {
+                long time = System.currentTimeMillis();
+                assert time >= start;
+                return time - start > Options.CompilationExpirationPeriod.getValue() * 1000;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public void close() {
+        compilationFinished();
+    }
+
+    private static final CompilationAlarm INSTANCE = enabled() ? new CompilationAlarm() : null;
+
+    /**
+     * Gets an object that can be used in a try-with-resource statement to set an time limit based
+     * alarm for a compilation.
+     *
+     * @return a {@link CompilationAlarm} instance if there is no current alarm for the calling
+     *         thread otherwise {@code null}
+     */
+    public static CompilationAlarm trackCompilationPeriod() {
+        if (compilationStarted()) {
+            return INSTANCE;
+        }
+        return null;
+    }
+
+}