test/jdk/jdk/jfr/event/oldobject/TestFieldInformation.java
changeset 50113 caf115bb98ad
child 51214 67736b4846a0
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/jdk/jfr/event/oldobject/TestFieldInformation.java	Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,120 @@
+/*
+ * Copyright (c) 2018, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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 jdk.jfr.event.oldobject;
+
+import java.lang.reflect.Modifier;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import jdk.jfr.Recording;
+import jdk.jfr.consumer.RecordedEvent;
+import jdk.jfr.consumer.RecordedObject;
+import jdk.jfr.internal.test.WhiteBox;
+import jdk.test.lib.Asserts;
+import jdk.test.lib.jfr.EventNames;
+import jdk.test.lib.jfr.Events;
+
+/*
+ * @test
+ * @key jfr
+ * @requires vm.gc == "null"
+ * @library /test/lib /test/jdk
+ * @modules jdk.jfr/jdk.jfr.internal.test
+ * @run main/othervm -XX:TLABSize=2k -Xlog:gc+tlab=trace jdk.jfr.event.oldobject.TestFieldInformation
+ */
+public class TestFieldInformation {
+
+    public static final Object[] testField = new Object[50];
+
+    public static void main(String[] args) throws Exception {
+        WhiteBox.setWriteAllObjectSamples(true);
+
+        try (Recording recording = new Recording()) {
+            recording.enable(EventNames.OldObjectSample).withoutStackTrace().with("cutoff", "infinity");
+            recording.start();
+
+            addToTestField();
+
+            recording.stop();
+
+            List<RecordedEvent> events = Events.fromRecording(recording);
+            Events.hasEvents(events);
+            for (RecordedEvent e : events) {
+                if (hasValidField(e)) {
+                    return;
+                }
+            }
+            System.out.println(events);
+            Asserts.fail("Could not find old object with field 'testField'");
+        }
+    }
+
+    private static boolean hasValidField(RecordedEvent e) throws Exception {
+        RecordedObject object = e.getValue("object");
+        Set<Long> visited = new HashSet<>();
+        while (object != null) {
+            Long address = object.getValue("address");
+            if (visited.contains(address)) {
+                return false;
+            }
+            visited.add(address);
+            RecordedObject referrer = object.getValue("referrer");
+            RecordedObject fieldObject = referrer != null ? referrer.getValue("field") : null;
+            if (fieldObject != null) {
+                String name = fieldObject.getValue("name");
+                if (name != null && name.equals("testField")) {
+                    int modifiers = (short) fieldObject.getValue("modifiers");
+                    if (!Modifier.isStatic(modifiers)) {
+                        throw new Exception("Field should be static");
+                    }
+                    if (!Modifier.isPublic(modifiers)) {
+                        throw new Exception("Field should be private");
+                    }
+                    if (!Modifier.isFinal(modifiers)) {
+                        throw new Exception("Field should be final");
+                    }
+                    if (Modifier.isTransient(modifiers)) {
+                        throw new Exception("Field should not be transient");
+                    }
+                    if (Modifier.isVolatile(modifiers)) {
+                        throw new Exception("Field should not be volatile");
+                    }
+                    return true;
+                }
+            }
+            object = referrer != null ? referrer.getValue("object") : null;
+        }
+        return false;
+    }
+
+    private static void addToTestField() {
+        for (int i = 0; i < testField.length; i++) {
+            // Allocate array to trigger sampling code path for interpreter / c1
+            testField[i] = new Object[1_000_000];
+        }
+    }
+}