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Re: [patch]: new returns misaligned pointers

To: dnovillo at cygnus dot com
Subject: Re: [patch]: new returns misaligned pointers
From: Mark Mitchell <mark at codesourcery dot com>
Date: Fri, 12 Nov 1999 15:52:37 -0800
Cc: gcc-patches at gcc dot gnu dot org
Organization: CodeSourcery, LLC
References: <Pine.LNX.4.10.9911121103540.30663-100000@rocinante.powersurfr.com>

>>>>> "Diego" == Diego Novillo <dnovillo@cygnus.com> writes:

    Diego> The problem is that this cookie header is created with
    Diego> double_type_node alignment which is 8, not 16. Therefore,
    Diego> the actual pointer returned by `new' is misaligned.

Makes sense.  Could you mention for which ports this makes a
difference?  If it does make a difference with an existing port, does
it still work to use new/delete across old and new .o files?

I'm sure Jason already went through this with you, so you needn't
really answer, but I'm curious.

    Diego> The patch below addresses this problem. It aligns the
    Diego> cookie header to BIGGEST_ALIGNMENT to avoid returning
    Diego> misaligned pointers with `new'.

Good.  Thanks for adding the comment!

--
Mark Mitchell                   mark@codesourcery.com
CodeSourcery, LLC               http://www.codesourcery.com

Follow-Ups:
- Re: [patch]: new returns misaligned pointers
  - From: Richard Henderson

References:
- [patch]: new returns misaligned pointers
  - From: Diego Novillo

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