[Patch, libfortran] Combine get_mem and internal_malloc_size

[Steve Kargl]

On Mon, Mar 26, 2012 at 06:17:08PM +0300, Janne Blomqvist wrote:
> 
> currently in libgfortran we have two malloc() wrappers, get_mem and
> internal_malloc_size, which abort the program if malloc fails.
> internal_malloc_size does
> 
> if (size == 0)
>     size = 1;
> 
> and then calls get_mem, which doesn't have such a zero-size check.
> This is, however, a bug in get_mem, as malloc(0) is allowed to return
> NULL, and in that case get_mem would incorrectly abort the program.
> Thus having both these functions is unnecessary. The attached patch
> combines these two functions into one.  As I couldn't decide between
> get_mem and internal_malloc_size and didn't particularly like either
> of the names, I named the combined function "xmalloc", as is common
> for such functions to be called.
> 
> When developing the patch, I noticed that the implementations of the
> intrinsics IALL, IANY, IPARITY, NORM2, and PARITY weren't being
> regenerated from the m4 sources. The reason, it turned out, was that
> the dependencies were specified incorrectly in Makefile.am. The patch
> also fixes this.
> 
> Regtested on x86_64-unknown-linux-gnu. While the patch is large, it's
> also mechanical, hence committed as obvious.
> 

The patch looks ok to me, but I do have two questions.

1) xmalloc is used in other parts of gcc.  Is there a
   possibility of confusing the libgfortran version 
   with the other(s)?  Perhaps, a unique name is in 
   order, gfc_xmalloc().

2) Unless I've misread the patch (which is always a
   possibility), it seems that you've removed 
   GFC_CLEAR_MEMORY, which used calloc to zero the
   allocated memory.  Is there a situation where 
   libgfortran needs/assumes the memory is zeroed
   upon allocation?

-- 
Steve