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Re: [Qemu-devel] [PATCH 01/17] qidl: add QEMU IDL processor

From: Gerd Hoffmann
Subject: Re: [Qemu-devel] [PATCH 01/17] qidl: add QEMU IDL processor
Date: Tue, 05 Jun 2012 14:19:16 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.4) Gecko/20120422 Thunderbird/10.0.4


> <snip>
> Suggestion: add a _guest marker for ordinary state.  Fail the build on
> unmarked fields.  This ensures that some thought is given to each field,
> instead of having a default that may be correct most of the time, but
> not always.
> Suggestion: add a mandatory position hint (_guest(7) or _pos(7)) that
> generates ordering within the fields.  This decouples the order of lines
> in the struct from the protocol, so you can add state where it make
> sense, or rearrange lines when they don't, and detect copy/paste errors.

I wouldn't make the position mandatory.  I expect the next generation
migration wire protocol transmits the field names anyway, so the
ordering will not matter any more, we need it for compatibility with
today's format only.


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