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Re: [PATCH] [JAVA] Double.parseDouble(null) throw NullPointerException
- From: Andrew Haley <aph at redhat dot com>
- To: java-patches at gcc dot gnu dot org
- Date: Mon, 15 Aug 2011 10:48:12 +0100
- Subject: Re: [PATCH] [JAVA] Double.parseDouble(null) throw NullPointerException
- References: <CABc96T_0THd_tKzdHSjD-xcPd7=dqoFkr0aRwrdvx-h4s2Hnxg@mail.gmail.com> <CABc96T_DNYxNsqKqdsVw7-x8uVc05_fB0BcHfJU5rv-VtFUv7A@mail.gmail.com>
On 08/07/2011 12:00 PM, Jie Liu wrote:
> When I use gcj on an RTOS(RTEMS), Double.parseDouble(null) throw
> NumberFormatException, but it should throw NullPointerException. So I
> add the patch below:
>
> Index: natVMDouble.cc
> ===================================================================
> --- natVMDouble.cc (revision 172224)
> +++ natVMDouble.cc (working copy)
> @@ -19,6 +19,7 @@
> #include <java/lang/VMDouble.h>
> #include <java/lang/Character.h>
> #include <java/lang/NumberFormatException.h>
> +#include <java/lang/NullPointerException.h>
> #include <jvm.h>
>
> #include <stdio.h>
> @@ -162,6 +163,9 @@
> jdouble
> java::lang::VMDouble::parseDouble(jstring str)
> {
> + if(str == NULL)
> + throw new NullPointerException();
> +
> int length = str->length();
>
> while (length > 0
>
> The testsuite/Throw_2.java has been PASS after this patch. what do you
> think about this patch?
This patch is not OK, and must not go in.
Look at the comment at the top of Throw_2:
// Check that NullPointerExceptions thrown from library code are
// caught. This detects a number of failures that can be caused by
// libgcj being built incorrectly. In particular, we ensure that a
// SEGV in native (i.e. C++) code in libgcj is handled correctly.
// Regrettably, we cannot guarantee that Double.parseDouble() will
// always be native code, or that it will never be inlined. It could
// be argued that we should add a method to libgcj that will be
// guaranteed forever to be native, but I'm reluctant to add to the
// library for the sole purpose of performing this test.
Andrew.