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From: Elijah Newren <newren@gmail.com>
To: Jonathan Tan <jonathantanmy@google.com>
Cc: Git Mailing List <git@vger.kernel.org>
Subject: Re: [PATCH v2 09/20] merge-ort: record stage and auxiliary info for every path
Date: Mon, 9 Nov 2020 15:08:58 -0800
Message-ID: <CABPp-BE=4uTRyxsuBUz7iB7+kqKjtM1-J3qiSi4q1nvwC1Odvg@mail.gmail.com> (raw)
In-Reply-To: <20201109220903.2536706-1-jonathantanmy@google.com>

On Mon, Nov 9, 2020 at 2:09 PM Jonathan Tan <jonathantanmy@google.com> wrote:
>
> > > So these are placed in paths but not unmerged. I'm starting to wonder if
> > > struct merge_options_internal should be called merge_options_state or
> > > something, and each field having documentation about when they're used
> > > (or better yet, have functions like collect_merge_info() return their
> > > calculations in return values (which may be "out" parameters) instead of
> > > in this struct).
> >
> > Right, unmerged is only those paths that remain unmerged after all
> > steps.  record_unmerged_index_entries() could simply walk over all
> > entries in paths and pick out the ones that were unmerged, but
> > process_entries() has to walk over all paths, determine whether they
> > can be merged, and determine what to record for the resulting tree for
> > each path.  So, having it stash away the unmerged stuff is a simple
> > optimization.
> >
> > Renaming to merge_options_state or even just merge_state would be fine
> > -- but any renaming done here will also affect merge-recursive.[ch].
> > See the definition of merge_options in merge-recursive.  (For history,
> > merge-recursive.h stuffed state into merge_options, which risked funny
> > misusage patterns and made the API unnecessarily complex...and made it
> > suggest that alternative algorithms needed to have the same state.
> > So, the state was moved to a merge_options_internal struct.  That's
> > not to say we can't rename, but it does need to be done in
> > merge-recursive as well.)
>
> Ah, I see.
>
> > As for having collect_merge_info() return their calculations in return
> > values, would that just end with me returning a struct
> > merge_options_internal?  Or did you want each return value added to
> > the function signature?  Each return value in the function signature
> > makes sense right now for this super-simplified initial 20 patches,
> > but what about when this data structure gains all kind of
> > rename-related state that is collected, updated, and passed between
> > these areas?  I'd have a huge number of "out" and "in" fields to every
> > function.  Eventually, merge_options_internal (or whatever it might be
> > renamed to) expands to the following, where I have to first define an
> > extra enum and two extra structs so that you know the definitions of
> > new types that show up in merge_options_internal:
>
> [snip enums and structs]
>
> Good point. I should have realized that there would be much more to
> track.
>
> > > > +     result->string = fullpath;
> > > > +     result->util = path_info;
> > > > +}
> > > > +
> > > >  static int collect_merge_info_callback(int n,
> > > >                                      unsigned long mask,
> > > >                                      unsigned long dirmask,
> > > > @@ -91,10 +136,12 @@ static int collect_merge_info_callback(int n,
> > > >        */
> > > >       struct merge_options *opt = info->data;
> > > >       struct merge_options_internal *opti = opt->priv;
> > > > -     struct conflict_info *ci;
> > > > +     struct string_list_item pi;  /* Path Info */
> > > > +     struct conflict_info *ci; /* pi.util when there's a conflict */
> > >
> > > Looking ahead to patch 10, this seems more like "pi.util unless we know
> > > for sure that there's no conflict".
> >
> > That's too long for the line to remain at 80 characters; it's 16
> > characters over the limit.  ;-)
>
> Well, you could move the description onto its own line :-)

:-)

  reply index

Thread overview: 84+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-02 20:43 [PATCH v2 00/20] fundamentals of merge-ort implementation Elijah Newren
2020-11-02 20:43 ` [PATCH v2 01/20] merge-ort: setup basic internal data structures Elijah Newren
2020-11-06 22:05   ` Jonathan Tan
2020-11-06 22:45     ` Elijah Newren
2020-11-09 20:55       ` Jonathan Tan
2020-11-02 20:43 ` [PATCH v2 02/20] merge-ort: add some high-level algorithm structure Elijah Newren
2020-11-02 20:43 ` [PATCH v2 03/20] merge-ort: port merge_start() from merge-recursive Elijah Newren
2020-11-11 13:52   ` Derrick Stolee
2020-11-11 16:22     ` Elijah Newren
2020-11-02 20:43 ` [PATCH v2 04/20] merge-ort: use histogram diff Elijah Newren
2020-11-11 13:54   ` Derrick Stolee
2020-11-11 16:47     ` Elijah Newren
2020-11-11 16:51       ` Derrick Stolee
2020-11-11 17:03         ` Elijah Newren
2020-11-02 20:43 ` [PATCH v2 05/20] merge-ort: add an err() function similar to one from merge-recursive Elijah Newren
2020-11-11 13:58   ` Derrick Stolee
2020-11-11 17:07     ` Elijah Newren
2020-11-11 17:10       ` Derrick Stolee
2020-11-02 20:43 ` [PATCH v2 06/20] merge-ort: implement a very basic collect_merge_info() Elijah Newren
2020-11-06 22:19   ` Jonathan Tan
2020-11-06 23:10     ` Elijah Newren
2020-11-09 20:59       ` Jonathan Tan
2020-11-11 14:38   ` Derrick Stolee
2020-11-11 17:02     ` Elijah Newren
2020-11-02 20:43 ` [PATCH v2 07/20] merge-ort: avoid repeating fill_tree_descriptor() on the same tree Elijah Newren
2020-11-11 14:51   ` Derrick Stolee
2020-11-11 17:13     ` Elijah Newren
2020-11-11 17:21       ` Eric Sunshine
2020-11-02 20:43 ` [PATCH v2 08/20] merge-ort: compute a few more useful fields for collect_merge_info Elijah Newren
2020-11-06 22:52   ` Jonathan Tan
2020-11-06 23:41     ` Elijah Newren
2020-11-09 22:04       ` Jonathan Tan
2020-11-09 23:05         ` Elijah Newren
2020-11-02 20:43 ` [PATCH v2 09/20] merge-ort: record stage and auxiliary info for every path Elijah Newren
2020-11-06 22:58   ` Jonathan Tan
2020-11-07  0:26     ` Elijah Newren
2020-11-09 22:09       ` Jonathan Tan
2020-11-09 23:08         ` Elijah Newren [this message]
2020-11-11 15:26   ` Derrick Stolee
2020-11-11 18:16     ` Elijah Newren
2020-11-11 22:06       ` Elijah Newren
2020-11-12 18:23         ` Derrick Stolee
2020-11-12 18:39       ` Derrick Stolee
2020-11-02 20:43 ` [PATCH v2 10/20] merge-ort: avoid recursing into identical trees Elijah Newren
2020-11-11 15:31   ` Derrick Stolee
2020-11-02 20:43 ` [PATCH v2 11/20] merge-ort: add a preliminary simple process_entries() implementation Elijah Newren
2020-11-11 19:51   ` Jonathan Tan
2020-11-12  1:48     ` Elijah Newren
2020-11-02 20:43 ` [PATCH v2 12/20] merge-ort: have process_entries operate in a defined order Elijah Newren
2020-11-11 16:09   ` Derrick Stolee
2020-11-11 18:58     ` Elijah Newren
2020-11-02 20:43 ` [PATCH v2 13/20] merge-ort: step 1 of tree writing -- record basenames, modes, and oids Elijah Newren
2020-11-11 20:01   ` Jonathan Tan
2020-11-11 20:24     ` Elijah Newren
2020-11-12 20:39       ` Jonathan Tan
2020-11-02 20:43 ` [PATCH v2 14/20] merge-ort: step 2 of tree writing -- function to create tree object Elijah Newren
2020-11-11 20:47   ` Jonathan Tan
2020-11-11 21:21     ` Elijah Newren
2020-11-02 20:43 ` [PATCH v2 15/20] merge-ort: step 3 of tree writing -- handling subdirectories as we go Elijah Newren
2020-11-12 20:15   ` Jonathan Tan
2020-11-12 22:30     ` Elijah Newren
2020-11-24 20:19       ` Elijah Newren
2020-11-25  2:07         ` Jonathan Tan
2020-11-26 18:13           ` Elijah Newren
2020-11-30 18:41             ` Jonathan Tan
2020-11-02 20:43 ` [PATCH v2 16/20] merge-ort: basic outline for merge_switch_to_result() Elijah Newren
2020-11-02 20:43 ` [PATCH v2 17/20] merge-ort: add implementation of checkout() Elijah Newren
2020-11-02 20:43 ` [PATCH v2 18/20] tree: enable cmp_cache_name_compare() to be used elsewhere Elijah Newren
2020-11-02 20:43 ` [PATCH v2 19/20] merge-ort: add implementation of record_unmerged_index_entries() Elijah Newren
2020-11-02 20:43 ` [PATCH v2 20/20] merge-ort: free data structures in merge_finalize() Elijah Newren
2020-11-03 14:49 ` [PATCH v2 00/20] fundamentals of merge-ort implementation Derrick Stolee
2020-11-03 16:36   ` Elijah Newren
2020-11-07  6:06     ` Elijah Newren
2020-11-07 15:02       ` Derrick Stolee
2020-11-07 19:39         ` Elijah Newren
2020-11-09 12:30           ` Derrick Stolee
2020-11-09 17:13             ` Elijah Newren
2020-11-09 19:51               ` Derrick Stolee
2020-11-09 22:44                 ` Elijah Newren
2020-11-11 17:08 ` Derrick Stolee
2020-11-11 18:35   ` Elijah Newren
2020-11-11 20:48     ` Derrick Stolee
2020-11-11 21:18       ` Elijah Newren
2020-11-29  7:43 [PATCH " Elijah Newren via GitGitGadget
2020-12-04 20:47 ` [PATCH v2 " Elijah Newren via GitGitGadget
2020-12-04 20:47   ` [PATCH v2 09/20] merge-ort: record stage and auxiliary info for every path Elijah Newren via GitGitGadget

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