# HG changeset patch
# User Roland Schatz <roland.schatz@oracle.com>
# Date 1395922819 -3600
# Node ID 145949aeeccb95cd5e62e97d381a57868634cca2
# Parent  d2038d372cd29ee021628aac10d26a09aa5cf4b0
Regression test for issue fixed in 6ae9af961b7c.

diff -r d2038d372cd2 -r 145949aeeccb graal/com.oracle.graal.compiler.test/src/com/oracle/graal/compiler/test/deopt/MonitorDeoptTest.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.compiler.test/src/com/oracle/graal/compiler/test/deopt/MonitorDeoptTest.java	Thu Mar 27 13:20:19 2014 +0100
@@ -0,0 +1,170 @@
+/*
+ * Copyright (c) 2007, 2012, 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 com.oracle.graal.compiler.test.deopt;
+
+import java.lang.reflect.*;
+
+import org.junit.*;
+
+import com.oracle.graal.api.code.*;
+import com.oracle.graal.api.meta.*;
+import com.oracle.graal.compiler.test.*;
+import com.oracle.graal.nodes.*;
+
+public final class MonitorDeoptTest extends GraalCompilerTest {
+
+    private enum State {
+        INITIAL, RUNNING_GRAAL, INVALIDATED, RUNNING_INTERPRETER, TERMINATED
+    }
+
+    private static class Monitor {
+        private volatile State state = State.INITIAL;
+
+        public synchronized void setState(State newState) {
+            state = newState;
+            notifyAll();
+        }
+
+        public synchronized boolean tryUpdateState(State oldState, State newState) {
+            if (state == oldState) {
+                state = newState;
+                notifyAll();
+                return true;
+            } else {
+                return false;
+            }
+        }
+
+        public synchronized void waitState(State targetState) throws InterruptedException {
+            while (state != targetState) {
+                wait();
+            }
+        }
+
+        public synchronized State getState() {
+            return state;
+        }
+
+        public synchronized void invalidate(InstalledCode code) {
+            state = State.INVALIDATED;
+            code.invalidate();
+        }
+    }
+
+    public static boolean test(Monitor monitor) {
+        // initially, we're running as Graal compiled code
+        monitor.setState(State.RUNNING_GRAAL);
+
+        for (;;) {
+            // wait for the compiled code to be invalidated
+            if (monitor.tryUpdateState(State.INVALIDATED, State.RUNNING_INTERPRETER)) {
+                break;
+            }
+        }
+
+        for (int i = 0; i < 500; i++) {
+            // wait for the control thread to send the TERMINATED signal
+            if (monitor.getState() == State.TERMINATED) {
+                return true;
+            }
+
+            try {
+                Thread.sleep(10);
+            } catch (InterruptedException e) {
+            }
+        }
+
+        // we're running for more than 5 s in the interpreter
+        // probably the control thread is deadlocked
+        return false;
+    }
+
+    private static LoopBeginNode findFirstLoop(StructuredGraph graph) {
+        FixedNode node = graph.start();
+        for (;;) {
+            if (node instanceof LoopBeginNode) {
+                return (LoopBeginNode) node;
+            } else if (node instanceof FixedWithNextNode) {
+                node = ((FixedWithNextNode) node).next();
+            } else if (node instanceof AbstractEndNode) {
+                node = ((AbstractEndNode) node).merge();
+            } else {
+                Assert.fail(String.format("unexpected node %s in graph of test method", node));
+            }
+        }
+    }
+
+    /**
+     * Remove the safepoint from the first loop in the test method, so only the safepoints on
+     * MonitorEnter and MonitorExit remain in the loop. That way, we can make sure it deopts inside
+     * the MonitorEnter by invalidating the code while holding the lock.
+     */
+    private static void removeLoopSafepoint(StructuredGraph graph) {
+        LoopBeginNode loopBegin = findFirstLoop(graph);
+        for (LoopEndNode end : loopBegin.loopEnds()) {
+            end.disableSafepoint();
+        }
+    }
+
+    @Test
+    public void run0() throws Throwable {
+        Method method = getMethod("test");
+
+        StructuredGraph graph = parse(method);
+        removeLoopSafepoint(graph);
+
+        ResolvedJavaMethod javaMethod = getMetaAccess().lookupJavaMethod(method);
+        CompilationResult compilationResult = compile(javaMethod, graph);
+        final InstalledCode installedCode = getProviders().getCodeCache().setDefaultMethod(javaMethod, compilationResult);
+
+        final Monitor monitor = new Monitor();
+
+        Thread controlThread = new Thread(new Runnable() {
+
+            public void run() {
+                try {
+                    // wait for the main thread to start
+                    monitor.waitState(State.RUNNING_GRAAL);
+
+                    // invalidate the compiled code while holding the lock
+                    // at this point, the compiled method hangs in a MonitorEnter
+                    monitor.invalidate(installedCode);
+
+                    // wait for the main thread to continue running in the interpreter
+                    monitor.waitState(State.RUNNING_INTERPRETER);
+
+                    // terminate the main thread
+                    monitor.setState(State.TERMINATED);
+                } catch (InterruptedException e) {
+                }
+            }
+        });
+
+        controlThread.start();
+
+        boolean result = test(monitor);
+        Assert.assertTrue(result);
+    }
+}