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Re: Status of the branch diff-optimizations-bytes branch

From: Hyrum K Wright <hyrum_at_hyrumwright.org>
Date: Wed, 26 Jan 2011 07:46:40 -0600

On Tue, Jan 25, 2011 at 11:41 PM, Daniel Shahaf <d.s_at_daniel.shahaf.name> wrote:
> Johan Corveleyn wrote on Wed, Jan 26, 2011 at 03:31:11 +0100:
>> Revving svn_diff_fns_t: what do you mean with parallelizing it? I must
>> admit that I don't really know (yet) how to go about that. Very early
>> during the branch work, danielsh pointed out that I modified this
>> public struct (vtable for reading data from datasources), so it should
>> be revved. Is it listed/documented somewhere what should be done for
>> that (community guide perhaps)?
>
> Briefly, revving a function includes re-declaring it, updating the old
> declaration to be a diff against the new one, marking it as deprecated
> (using doxygen and C preprocessor designators), and re-implementing the
> old function as a deprecated.c wrapper around the new one.
>
> For a struct, you need to re-declare the struct and revv functions that
> use it.  Also, don't forget to add a constructor function
> (svn_foo_t_create(), but s/_t_/_/) (and possibly a duplicator function),
> and forbid people from defining variables of the struct type directly.
>
> I'm not sure HACKING contains this.  On the other hand, the public
> header files contain plenty of examples of everything I just said...

For testing purposes, I usually find it easiest to work "from the
bottom up". In other words, rev the lowest API in the call stack,
write the appropriate wrapper for the existing API, and test and
commit. This ensures that the existing API (now implemented as a
wrapper) still behaves the same way, but it doesn't yet exercise
whatever the new functionality is. I then just work my way up the
stack for each related function. Structs are a little more involved,
but can use similar principles.

Johan, if you don't mind, I can put some of my (admittedly limited)
tuits into looking at what needs to be done to rev the above struct.

-Hyrum
Received on 2011-01-26 14:47:24 CET

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