New test to reveal issues with compiler

dcevm/src/test/java7/com/github/dcevm/test/eval/SimpleObjectStressTest.java

@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2010, 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.github.dcevm.test.eval;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import static com.github.dcevm.test.util.HotSwapTestHelper.__toVersion__;
+import static com.github.dcevm.test.util.HotSwapTestHelper.__version__;
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Test to reveal issues with JIT compiler (one of the compiler threads might be compiling method while we are reloading it).
+ */
+public class SimpleObjectStressTest {
+
+  private final int COUNT = 100000;
+
+  @Before
+  public void setUp() throws Exception {
+    __toVersion__(0);
+  }
+
+  // Version 0
+  public static class A {
+
+    public int value() {
+      return 0;
+    }
+  }
+
+  // Version 1
+  public static class A___1 {
+
+    public int value() {
+      return 1;
+    }
+  }
+
+  @Test
+  public void testLotsOfObjects() {
+
+    assert __version__() == 0;
+
+    A[] arr = new A[COUNT];
+    for (int i = 0; i < arr.length; i++) {
+      arr[i] = new A();
+    }
+
+    for (int k = 0; k < 100; k++) {
+
+      __toVersion__(1);
+
+      for (int i = 0; i < arr.length; i++) {
+        assertEquals(1, arr[i].value());
+      }
+
+      __toVersion__(0);
+
+      for (int i = 0; i < arr.length; i++) {
+        assertEquals(0, arr[i].value());
+      }
+    }
+  }
+
+  public static void main(String... args) {
+    new SimpleObjectStressTest().testLotsOfObjects();
+  }
+}