[PATCH v5.1 3.5/4] revision: make helper for pathspec to bloom key

[Derrick Stolee <stolee@gmail.com>]

On 7/10/2025 4:48 AM, Lidong Yan wrote:
> @@ -710,23 +709,26 @@ static void prepare_to_use_bloom_filter(struct rev_info *revs)
>  	if (!revs->pruning.pathspec.nr)
>  		return;
>  
> -	revs->bloom_keyvecs_nr = 1;
> -	CALLOC_ARRAY(revs->bloom_keyvecs, 1);
> -	pi = &revs->pruning.pathspec.items[0];
> +	revs->bloom_keyvecs_nr = revs->pruning.pathspec.nr;
> +	CALLOC_ARRAY(revs->bloom_keyvecs, revs->bloom_keyvecs_nr);
> +	for (int i = 0; i < revs->pruning.pathspec.nr; i++) {
> +		pi = &revs->pruning.pathspec.items[i];
>  
> -	/* remove single trailing slash from path, if needed */
> -	if (pi->len > 0 && pi->match[pi->len - 1] == '/') {
> -		path_alloc = xmemdupz(pi->match, pi->len - 1);
> -		path = path_alloc;
> -	} else
> -		path = pi->match;
> +		/* remove single trailing slash from path, if needed */
> +		if (pi->len > 0 && pi->match[pi->len - 1] == '/') {
> +			path_alloc = xmemdupz(pi->match, pi->len - 1);
> +			path = path_alloc;
> +		} else
> +			path = pi->match;
>  
> -	len = strlen(path);
> -	if (!len)
> -		goto fail;
> +		len = strlen(path);
> +		if (!len)
> +			goto fail;
>  
> -	revs->bloom_keyvecs[0] =
> -		bloom_keyvec_new(path, len, revs->bloom_filter_settings);
> +		revs->bloom_keyvecs[i] =
> +			bloom_keyvec_new(path, len, revs->bloom_filter_settings);
> +		FREE_AND_NULL(path_alloc);
> +	}

This diff is still bigger than I was hoping, so I'm sending a couple
of patches that simplify this code movement. Feel free to ignore
them as being too nit-picky.

--- >8 ---

From 69fa36dc615e140ae842b536f7da792beaebb272 Mon Sep 17 00:00:00 2001
From: Derrick Stolee <stolee@gmail.com>
Date: Thu, 10 Jul 2025 08:06:29 -0400
Subject: [PATCH v5.1 3.5/4] revision: make helper for pathspec to bloom key

When preparing to use bloom filters in a revision walk, Git populates a
boom_keyvec with an array of bloom keys for the components of a path.
Before we create the ability to map multiple pathspecs to multiple
bloom_keyvecs, extract the conversion from a pathspec to a bloom_keyvec
into its own helper method. This simplifies the state that persists in
prepare_to_use_bloom_filter() as well as makes the next change much
simpler.

Signed-off-by: Derrick Stolee <stolee@gmail.com>
---
 revision.c | 50 +++++++++++++++++++++++++++++++-------------------
 1 file changed, 31 insertions(+), 19 deletions(-)

diff --git a/revision.c b/revision.c
index 22bcfab7f93..4c09b594c55 100644
--- a/revision.c
+++ b/revision.c
@@ -687,14 +687,37 @@ static int forbid_bloom_filters(struct pathspec *spec)
 
 static void release_revisions_bloom_keyvecs(struct rev_info *revs);
 
-static void prepare_to_use_bloom_filter(struct rev_info *revs)
+static int convert_pathspec_to_filter(const struct pathspec_item *pi,
+				      struct bloom_keyvec **bloom_keyvec,
+				      const struct bloom_filter_settings *settings)
 {
-	struct pathspec_item *pi;
-	struct bloom_keyvec *bloom_keyvec;
-	char *path_alloc = NULL;
-	const char *path, *p;
 	size_t len;
+	const char *path;
+	char *path_alloc = NULL;
+	int res = 0;
+
+	/* remove single trailing slash from path, if needed */
+	if (pi->len > 0 && pi->match[pi->len - 1] == '/') {
+		path_alloc = xmemdupz(pi->match, pi->len - 1);
+		path = path_alloc;
+	} else
+		path = pi->match;
+
+	len = strlen(path);
+	if (!len) {
+		res = -1;
+		goto cleanup;
+	}
+
+	*bloom_keyvec = bloom_keyvec_new(path, len, settings);
 
+cleanup:
+	FREE_AND_NULL(path_alloc);
+	return res;
+}
+
+static void prepare_to_use_bloom_filter(struct rev_info *revs)
+{
 	if (!revs->commits)
 		return;
 
@@ -712,22 +735,12 @@ static void prepare_to_use_bloom_filter(struct rev_info *revs)
 
 	revs->bloom_keyvecs_nr = 1;
 	CALLOC_ARRAY(revs->bloom_keyvecs, 1);
-	pi = &revs->pruning.pathspec.items[0];
 
-	/* remove single trailing slash from path, if needed */
-	if (pi->len > 0 && pi->match[pi->len - 1] == '/') {
-		path_alloc = xmemdupz(pi->match, pi->len - 1);
-		path = path_alloc;
-	} else
-		path = pi->match;
-
-	len = strlen(path);
-	if (!len)
+	if (convert_pathspec_to_filter(&revs->pruning.pathspec.items[0],
+				       &revs->bloom_keyvecs[0],
+				       revs->bloom_filter_settings))
 		goto fail;
 
-	revs->bloom_keyvecs[0] =
-		bloom_keyvec_new(path, len, revs->bloom_filter_settings);
-
 	if (trace2_is_enabled() && !bloom_filter_atexit_registered) {
 		atexit(trace2_bloom_filter_statistics_atexit);
 		bloom_filter_atexit_registered = 1;
@@ -737,7 +750,6 @@ static void prepare_to_use_bloom_filter(struct rev_info *revs)
 
 fail:
 	revs->bloom_filter_settings = NULL;
-	free(path_alloc);
 	release_revisions_bloom_keyvecs(revs);
 }
 
-- 
2.47.2.vfs.0.2