structure layout in C

muller@src.dec.com (Eric Muller)
Mon, 11 May 1992 18:04:10 GMT

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structure layout in C muller@src.dec.com (1992-05-11)
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Re: structure layout in C stephen@estragon.uchicago.edu (1992-05-13)
Re: structure layout in C bliss@sp64.csrd.uiuc.edu (1992-05-15)
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From: muller@src.dec.com (Eric Muller)
Keywords: C, question
Organization: DEC Systems Research Center
Date: Mon, 11 May 1992 18:04:10 GMT

I'd like to find an algorithm to determine the layout of C structure
declarations. This algorithm should be parameterized so that it can
work for as many machines as possible. The algorithm used in GCC
would have been a perfect candidate, if only I could understand it
(without reading all of gcc).


Thanks in advance,
Eric.
[Every compiler I've ever seen aligns each field on its natural boundary
(which on machines like the 286 may be a byte regardless of field size.)
There's a little more variety on arrays of structures, but only two or
three monor variations. Does anyone do something different? As I recall,
ANSI specifically forbids reordering fields to pack them in better. -John]
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