8080156: Integer.toString(int value) sometimes throws NPE
Summary: Added test to check correctness of type propagation to CmpUNodes.
Reviewed-by: kvn
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/compiler/types/TestTypePropagationToCmpU.java Fri May 22 13:02:47 2015 +0200
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2015, 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.
+ */
+
+/*
+ * @test
+ * @bug 8080156 8060036
+ * @summary Test correctness of type propagation to CmpUNodes.
+ * @run main TestTypePropagationToCmpU
+ */
+public class TestTypePropagationToCmpU {
+ public static void main(String[] args) {
+ try {
+ // Trigger compilation
+ for (int i = 0; i < 100_000; ++i) {
+ test();
+ }
+ } catch (NullPointerException e) {
+ // Test should never throw a NullPointerException
+ throw new RuntimeException("Test failed");
+ }
+ }
+
+ static int global = 42;
+
+ public static void test() {
+ int a = Integer.MIN_VALUE;
+ int b = global;
+ char[] buf = { 0 };
+ for (int i = 0; i <= b; ++i) {
+ a = i - b;
+ }
+ // C2 adds a range check and an uncommon trap here to ensure that the array index
+ // is in bounds. If type information is not propagated correctly to the corresponding
+ // CmpUNode, this trap may be always taken. Because C2 also removes the unnecessary
+ // allocation of 'buf', a NullPointerException is thrown in this case.
+ char c = buf[(a * 11) / 2 - a]; // a is 0 here if global >= 0
+ buf[0] = 0;
+ }
+}