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authorJeff King <peff@peff.net>2014-06-12 22:05:37 (GMT)
committerJunio C Hamano <gitster@pobox.com>2014-06-13 19:07:47 (GMT)
commit0fb370da9ca972f9571530f95c0dacb31368c280 (patch)
tree2d4939d8716703f5b2d3cbdea887ef2e7fd1e6c0
parentd74a4e57d2703e841deed994752b948a768f31ec (diff)
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provide a helper to free commit buffer
This converts two lines into one at each caller. But more importantly, it abstracts the concept of freeing the buffer, which will make it easier to change later. Note that we also need to provide a "detach" mechanism for a tricky case in index-pack. We are passed a buffer for the object generated by processing the incoming pack. If we are not using --strict, we just calculate the sha1 on that buffer and return, leaving the caller to free it. But if we are using --strict, we actually attach that buffer to an object, pass the object to the fsck functions, and then detach the buffer from the object again (so that the caller can free it as usual). In this case, we don't want to free the buffer ourselves, but just make sure it is no longer associated with the commit. Note that we are making the assumption here that the attach/detach process does not impact the buffer at all (e.g., it is never reallocated or modified). That holds true now, and we have no plans to change that. However, as we abstract the commit_buffer code, this dependency becomes less obvious. So when we detach, let's also make sure that we get back the same buffer that we gave to the commit_buffer code. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r--builtin/fsck.c3
-rw-r--r--builtin/index-pack.c3
-rw-r--r--builtin/log.c6
-rw-r--r--builtin/rev-list.c3
-rw-r--r--commit.c13
-rw-r--r--commit.h11
6 files changed, 30 insertions, 9 deletions
diff --git a/builtin/fsck.c b/builtin/fsck.c
index fc150c8..8aadca1 100644
--- a/builtin/fsck.c
+++ b/builtin/fsck.c
@@ -310,8 +310,7 @@ static int fsck_obj(struct object *obj)
if (obj->type == OBJ_COMMIT) {
struct commit *commit = (struct commit *) obj;
- free(commit->buffer);
- commit->buffer = NULL;
+ free_commit_buffer(commit);
if (!commit->parents && show_root)
printf("root %s\n", sha1_to_hex(commit->object.sha1));
diff --git a/builtin/index-pack.c b/builtin/index-pack.c
index b9f6e12..42551ce 100644
--- a/builtin/index-pack.c
+++ b/builtin/index-pack.c
@@ -774,7 +774,8 @@ static void sha1_object(const void *data, struct object_entry *obj_entry,
}
if (obj->type == OBJ_COMMIT) {
struct commit *commit = (struct commit *) obj;
- commit->buffer = NULL;
+ if (detach_commit_buffer(commit) != data)
+ die("BUG: parse_object_buffer transmogrified our buffer");
}
obj->flags |= FLAG_CHECKED;
}
diff --git a/builtin/log.c b/builtin/log.c
index 39e8836..226f8f2 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -349,8 +349,7 @@ static int cmd_log_walk(struct rev_info *rev)
rev->max_count++;
if (!rev->reflog_info) {
/* we allow cycles in reflog ancestry */
- free(commit->buffer);
- commit->buffer = NULL;
+ free_commit_buffer(commit);
}
free_commit_list(commit->parents);
commit->parents = NULL;
@@ -1508,8 +1507,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
reopen_stdout(rev.numbered_files ? NULL : commit, NULL, &rev, quiet))
die(_("Failed to create output files"));
shown = log_tree_commit(&rev, commit);
- free(commit->buffer);
- commit->buffer = NULL;
+ free_commit_buffer(commit);
/* We put one extra blank line between formatted
* patches and this flag is used by log-tree code
diff --git a/builtin/rev-list.c b/builtin/rev-list.c
index 9f92905..e012ebe 100644
--- a/builtin/rev-list.c
+++ b/builtin/rev-list.c
@@ -173,8 +173,7 @@ static void finish_commit(struct commit *commit, void *data)
free_commit_list(commit->parents);
commit->parents = NULL;
}
- free(commit->buffer);
- commit->buffer = NULL;
+ free_commit_buffer(commit);
}
static void finish_object(struct object *obj,
diff --git a/commit.c b/commit.c
index fbdc480..11a05c1 100644
--- a/commit.c
+++ b/commit.c
@@ -245,6 +245,19 @@ int unregister_shallow(const unsigned char *sha1)
return 0;
}
+void free_commit_buffer(struct commit *commit)
+{
+ free(commit->buffer);
+ commit->buffer = NULL;
+}
+
+const void *detach_commit_buffer(struct commit *commit)
+{
+ void *ret = commit->buffer;
+ commit->buffer = NULL;
+ return ret;
+}
+
int parse_commit_buffer(struct commit *item, const void *buffer, unsigned long size)
{
const char *tail = buffer;
diff --git a/commit.h b/commit.h
index 4df48cb..d72ed43 100644
--- a/commit.h
+++ b/commit.h
@@ -51,6 +51,17 @@ int parse_commit_buffer(struct commit *item, const void *buffer, unsigned long s
int parse_commit(struct commit *item);
void parse_commit_or_die(struct commit *item);
+/*
+ * Free any cached object buffer associated with the commit.
+ */
+void free_commit_buffer(struct commit *);
+
+/*
+ * Disassociate any cached object buffer from the commit, but do not free it.
+ * The buffer (or NULL, if none) is returned.
+ */
+const void *detach_commit_buffer(struct commit *);
+
/* Find beginning and length of commit subject. */
int find_commit_subject(const char *commit_buffer, const char **subject);