Re: array bounds checking

nmm1@cus.cam.ac.uk (Nick Maclaren)
27 Nov 2005 00:35:43 -0500

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From: nmm1@cus.cam.ac.uk (Nick Maclaren)
Newsgroups: comp.compilers
Date: 27 Nov 2005 00:35:43 -0500
Organization: University of Cambridge, England
References: 05-11-121
Keywords: debug

  dz <drizzle76@gmail.com> wrote:
> I am wondering if anybody knew how array bounds checks worked when
>they are references through multiple indirections of pointers. Eg: p =
>A ; q= &p; ***q+100=0; So q is referencing A. And hence I would like
>a check inserted there.
> Do array bounds checking handle these cases, because this
>also would need pointer analysis.


If you are talking about C, array bounds checking is effectively
hopeless. If you were talking about Fortran, it is fairly easy.


>[Depends on the language and implementation. If it has "fat" pointers
>that contain type info, then the bounds can be in the pointers, or
>pointed to by fields in the pointers. -John]


The main alternative approach is to have arrays implemented as structures,
including the bounds and data pointer.




Regards,
Nick Maclaren.


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