[PATCH v2 07/17] [GSOC] ref-filter: introduce free_ref_array_item_value() function

From: ZheNing Hu via GitGitGadget <gitgitgadget@gmail.com>
Date: Jul 15, 2021, 15:40 UTC
Message-ID: <e5cf5541024fb1744d1b9e8417d2148129c53f8e.1626363626.git.gitgitgadget@gmail.com>
In-Reply-To: <pull.993.v2.git.1626363626.gitgitgadget@gmail.com>

From: ZheNing Hu <adlternative@gmail.com>

When we use ref_array_item which is not dynamically allocated and want to free the space of its member "value" after the end of use, free_array_item() does not meet our needs, because it tries to free ref_array_item itself and its member "symref".

Introduce free_ref_array_item_value() for freeing ref_array_item value. It will be called internally by free_array_item(), and it will help `cat-file --batch` free ref_array_item's value memory later.

Helped-by: Junio C Hamano <gitster@pobox.com>
Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Hariom Verma <hariom18599@gmail.com>
Signed-off-by: ZheNing Hu <adlternative@gmail.com>
---
 ref-filter.c | 11 ++++++++---
 ref-filter.h |  2 ++
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/ref-filter.c b/ref-filter.c
index cfcea0e507e..d70b295672f 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -2296,16 +2296,21 @@ static int ref_filter_handler(const char *refname, const struct object_id *oid,
 	return 0;
 }
 
-/*  Free memory allocated for a ref_array_item */
-static void free_array_item(struct ref_array_item *item)
+void free_ref_array_item_value(struct ref_array_item *item)
 {
-	free((char *)item->symref);
 	if (item->value) {
 		int i;
 		for (i = 0; i < used_atom_cnt; i++)
 			free((char *)item->value[i].s);
 		free(item->value);
 	}
+}
+
+/*  Free memory allocated for a ref_array_item */
+static void free_array_item(struct ref_array_item *item)
+{
+	free((char *)item->symref);
+	free_ref_array_item_value(item);
 	free(item);
 }
 
diff --git a/ref-filter.h b/ref-filter.h
index c15dee8d6b9..44e6dc05ac2 100644
--- a/ref-filter.h
+++ b/ref-filter.h
@@ -111,6 +111,8 @@ struct ref_format {
 int filter_refs(struct ref_array *array, struct ref_filter *filter, unsigned int type);
 /*  Clear all memory allocated to ref_array */
 void ref_array_clear(struct ref_array *array);
+/* Free ref_array_item's value */
+void free_ref_array_item_value(struct ref_array_item *item);
 /*  Used to verify if the given format is correct and to parse out the used atoms */
 int verify_ref_format(struct ref_format *format);
 /*  Sort the given ref_array as per the ref_sorting provided */

-- 
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