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langtools/test/tools/javac/BadOptimization/DeadCode3.java

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+/*
+ * Copyright 1999 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ * @test
+ * @bug 4057345 4120016 4120014
+ * @summary final void function:  Verify that overzealous dead-code elimination
+ * no longer removes live code.
+ * @author dps
+ *
+ * @run clean DeadCode3
+ * @run compile -O DeadCode3.java
+ * @run main DeadCode3
+ */
+
+public class DeadCode3
+{
+    private final void fun1() { }
+
+    private void fun2() {
+        DeadCode3 r1 = null;
+        fun1();
+
+        // we expect an NullPointerException because of this line
+        r1.fun1();
+    }
+
+    public static void main( String[] args ) {
+        try {
+            new DeadCode3() . fun2();
+            // if we got past the constructor, then there must be a problem
+            throw new RuntimeException("accidental removal of live code");
+        } catch (NullPointerException e) {
+            System.out.println("NullPointerException correctly thrown");
+            e.printStackTrace();
+        }
+    }
+}