[9] RFR(S): 8029343: CodeCache::allocate increments '_number_of_blobs' even if allocation fails.

[Igor Veresov]

BufferBlob::operator new() doesn’t seem to be quite ready to see the NULL return. Could we put some error handling in there? Like a call to fatal() similar to other places. Otherwise looks good.

igor

On May 6, 2014, at 12:27 AM, Tobias Hartmann <tobias.hartmann at oracle.com> wrote:

> Hi,
> 
> please review the following patch for bug 8029343.
> 
> Problem:
> (1) CodeCache::allocate(...) increments _number_of_blobs before the actual allocation is performed. In case the allocation fails the counter is set to a wrong value.
> (2) The guarantee(size >= 0, ...) is incorrect. Calling CodeCache::allocate(...) with size = 0 leads to a segmentation fault. Further, a guarantee is too strong here. We can simply return NULL at runtime if the size is <= 0.
> Bug: https://bugs.openjdk.java.net/browse/JDK-8029343
> 
> Solution:
> (1) The increment is moved after the allocation.
> (2) An assert is used instead of the guarantee and NULL is returned if size <= 0.
> Webrev: http://cr.openjdk.java.net/~anoll/8029343/webrev.00/
> 
> Thanks,
> Tobias