This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: Can realloc be marked as a mallloc-like function?


On 7/14/07, H.J. Lu <hjl@lucon.org> wrote:
On Sat, Jul 14, 2007 at 06:03:33PM +0200, Tobias Schlüter wrote:
> H.J. Lu wrote:
> >It looks like gcc assumes a functon marked with DECL_IS_MALLOC won't
> >return an address which can alias something else. But it isn't true
> >for realloc. Now, the qestions are
> >
> >1. Can gcc make such an assumption?
> >2. Can realloc be marked as DECL_IS_MALLOC.
> >
> >BTW, glibc also marks realloc with __attribute_malloc__.
>
> There was an absurdely long thread on this topic starting at
> <http://gcc.gnu.org/ml/gcc/2004-01/msg00005.html>.  I didn't dig through
> it to find the answer.

Now, we have a real testcase to show the problem. How do we solve
it?

I assigned the bug to myself, since I caused it. However, as the regression is not seen on x86, I suppose there is only so much I can do. HJL, can you confirm that indeed removing only the DECL_IS_MALLOC of internal_realloc fixes the issue on IA-64?

When I get back home tonight I'll take a look at the trees created by
array_constructor_6 and see if we do something obviously stupid, i.e.
can the frontend be fixed in some other way so that we can still keep
internal_realloc marked with DECL_IS_MALLOC.

--
Janne Blomqvist


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]