6910473: java.math.BigInteger.bitLength() may return negative "int" on large numbers
8021203: BigInteger.doubleValue/floatValue returns 0.0 instead of Infinity
8021204: Constructor BigInteger(String val, int radix) doesn't detect overflow
8022780: Incorrect BigInteger division because of MutableBigInteger.bitLength() overflow
Summary: Prevent construction of overflowed BigIntegers.
Reviewed-by: bpb, darcy, psandoz
Contributed-by: Dmitry Nadezhin <dmitry.nadezhin@oracle.com>
diff --git a/test/java/math/BigInteger/BitLengthOverflow.java b/test/java/math/BigInteger/BitLengthOverflow.java
new file mode 100644
index 0000000..04f11b2
--- /dev/null
+++ b/test/java/math/BigInteger/BitLengthOverflow.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2013, 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 6910473
+ * @summary Test that bitLength() is not negative
+ * @author Dmitry Nadezhin
+ */
+import java.math.BigInteger;
+
+public class BitLengthOverflow {
+
+ public static void main(String[] args) {
+
+ try {
+ BigInteger x = BigInteger.ONE.shiftLeft(Integer.MAX_VALUE); // x = pow(2,Integer.MAX_VALUE)
+ if (x.bitLength() != (1L << 31))
+ throw new RuntimeException("Incorrect bitLength() " + x.bitLength());
+ System.out.println("Surprisingly passed with correct bitLength() " + x.bitLength());
+ } catch (ArithmeticException e) {
+ // expected
+ System.out.println("Overflow is reported by ArithmeticException, as expected");
+ } catch (OutOfMemoryError e) {
+ // possible
+ System.out.println("OutOfMemoryError");
+ }
+ }
+}