getting symbolic C structure offsets (was: Re: C code validation service)

Stephen Egbert <egbert@torch.timeplex.com> asked for an
| [...] extended preprocessor (GNU cpp or otherwise) that
| can translate the C-styled structure offset for uses with assembly code
| using symbolic offset.


and our esteemed moderator commented


| I'd think you could hack something up by running the structure def
| through cc -g -S and using a perl script to extract the info from the
| .stabs entries into defines for your assembler code. [...]


I'm not quite sure if this is what Stephen was looking for, but the
very hack our moderator suggested comes as a standard utility with
perl, under the name 'c2ph', a.k.a. 'pstruct'.


As 'pstruct', this prints a nicely formatted table of C structure
types, member names, offsets, and lengths. As 'c2ph', it provides
pack/unpack formats and metainformation so perl code can easily
manipulate in-memory C structures.


From here, it's an SMOP (presumably in perl) to generate symbol
definitions, cpp #defines, or <your favorite syntax> to pass this
information to assembly programs.


- Jonathan Thornburg <bkis@island.net> (personal E-mail)
    U of British Columbia / Physics Dept / <thornbur@theory.physics.ubc.ca>
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