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From: Jonathan Tan <jonathantanmy@google.com>
To: newren@gmail.com
Cc: git@vger.kernel.org, Jonathan Tan <jonathantanmy@google.com>
Subject: Re: [PATCH v2 01/20] merge-ort: setup basic internal data structures
Date: Fri,  6 Nov 2020 14:05:21 -0800	[thread overview]
Message-ID: <20201106220521.757698-1-jonathantanmy@google.com> (raw)
In-Reply-To: <20201102204344.342633-2-newren@gmail.com>

I'm not very familiar with the merge machinery, but I'll attempt a
review of at least the first 10 patches.

> merged_info contains all relevant information for a non-conflicted
> entry.  conflict_info contains a merged_info, plus any additional
> information about a conflict such as the higher orders stages involved
> and the names of the paths those came from (handy once renames get
> involved).  If an entry remains conflicted, the merged_info portion of a
> conflict_info will later be filled with whatever version of the file
> should be placed in the working directory (e.g. an as-merged-as-possible
> variation that contains conflict markers).

I think that this information should be in the .c file.

> diff --git a/merge-ort.c b/merge-ort.c
> index b487901d3e..9d5ea0930d 100644
> --- a/merge-ort.c
> +++ b/merge-ort.c
> @@ -17,6 +17,46 @@
>  #include "cache.h"
>  #include "merge-ort.h"
>  
> +#include "strmap.h"
> +
> +struct merge_options_internal {
> +	struct strmap paths;    /* maps path -> (merged|conflict)_info */
> +	struct strmap unmerged; /* maps path -> conflict_info */
> +	const char *current_dir_name;
> +	int call_depth;
> +};

Maybe document if the path is from the root of the directory or just the
filename as it appears in a tree object?

I would have expected "unmerged" to be a "strset", but I guess it's more
convenient for it to be a map itself. Maybe just document it as "all
mappings in paths wherein the value is a struct conflict_info".

There seems to be 2 ways of referring to something that we couldn't
merge - "conflicted" (or "having a conflict") and "unmerged". Should we
stick to one of them?

Also, looking ahead, I see that current_dir_name is used as a temporary
variable in the recursive calls to collect_merge_info_callback(). I
would prefer if current_dir_name went in the cbdata to that function
instead, but if that's not possible, maybe document here that
current_dir_name is only used in collect_merge_info_callback(), and
temporarily at that.

> +struct version_info {
> +	struct object_id oid;
> +	unsigned short mode;
> +};

OK.

> +struct merged_info {
> +	struct version_info result;
> +	unsigned is_null:1;
> +	unsigned clean:1;
> +	size_t basename_offset;
> +	 /*
> +	  * Containing directory name.  Note that we assume directory_name is
> +	  * constructed such that
> +	  *    strcmp(dir1_name, dir2_name) == 0 iff dir1_name == dir2_name,
> +	  * i.e. string equality is equivalent to pointer equality.  For this
> +	  * to hold, we have to be careful setting directory_name.
> +	  */
> +	const char *directory_name;
> +};

I'm not sure how most of the fields in this struct are to be used, but
perhaps that will be clearer once I read the subsequent code.

> +struct conflict_info {
> +	struct merged_info merged;
> +	struct version_info stages[3];
> +	const char *pathnames[3];

Why would these be different across stages? (Rename detection?)

> +	unsigned df_conflict:1;

OK.

> +	unsigned path_conflict:1;

This doesn't seem to be assigned anywhere in this patch set?

> +	unsigned filemask:3;
> +	unsigned dirmask:3;

I wonder if this needs to be documented that the least significant bit
corresponds to stages[0], and so forth.

> +	unsigned match_mask:3;

I think this can be derived by just looking at the stages array? Maybe
document as:

  Optimization to track which stages match. Either 0 or at least 2 bits
  are set; if at least 2 bits are set, their corresponding stages match.

> +};

  reply	other threads:[~2020-11-06 22:05 UTC|newest]

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 [this message]
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
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 01/20] merge-ort: setup basic internal data structures Elijah Newren via GitGitGadget

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