Add test for hashCode and System.identityHashCode.
(cherry picked from commit bda2836af470c45e30c567b14d6747a7450c4741)
Change-Id: Ieba8f8eb09441ec145a176df00c293695eae0f47
diff --git a/test/120-hashcode/expected.txt b/test/120-hashcode/expected.txt
new file mode 100644
index 0000000..619c561
--- /dev/null
+++ b/test/120-hashcode/expected.txt
@@ -0,0 +1 @@
+Done.
diff --git a/test/120-hashcode/info.txt b/test/120-hashcode/info.txt
new file mode 100644
index 0000000..80f131d
--- /dev/null
+++ b/test/120-hashcode/info.txt
@@ -0,0 +1 @@
+Check that object hashCode and System.identityHashCode never cause the hash to change.
\ No newline at end of file
diff --git a/test/120-hashcode/src/Main.java b/test/120-hashcode/src/Main.java
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+++ b/test/120-hashcode/src/Main.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+public class Main {
+ public static void main(String[] args) {
+ Object o = new Object();
+ // Generate a hashcode and put it in the lock word.
+ int hashOrig = o.hashCode();
+ int hashInflated = 0;
+ int hashSystemOrig = System.identityHashCode(o);
+ int hashSystemInflated = 0;
+ // Inflate the monitor to move the hash from the lock word to the Monitor.
+ synchronized (o) {
+ hashInflated = o.hashCode();
+ hashSystemInflated = System.identityHashCode(o);
+ }
+ // Make sure that all the hashes agree.
+ if (hashOrig != hashInflated || hashOrig != hashSystemOrig ||
+ hashSystemOrig != hashSystemInflated) {
+ System.err.println("hash codes dont match: " + hashOrig + " " + hashInflated + " " +
+ hashSystemOrig + " " + hashSystemInflated);
+ }
+ System.out.println("Done.");
+ }
+}
+
+
