[PATCH v2 2/4] commit: create get_commit_tree() method

From: Derrick Stolee <dstolee@microsoft.com>
Date: Apr 6, 2018, 19:09 UTC
Message-ID: <20180406190919.167092-3-dstolee@microsoft.com>
In-Reply-To: <20180406190919.167092-1-dstolee@microsoft.com>

While walking the commit graph, we load struct commit objects into the object cache. During this process, we also load struct tree objects for the root tree of each of these commits. We load these objects even if we are only computing commit reachability information, such as a merge base or ahead/behind information.

Create get_commit_tree() as a first step to removing direct references to the 'maybe_tree' member of struct commit.

Create get_commit_tree_oid() as a shortcut for several references to "&commit->maybe_tree->object.oid" in the codebase.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
---
 commit.c | 10 ++++++++++
 commit.h |  3 +++
 2 files changed, 13 insertions(+)

diff --git a/commit.c b/commit.c
index fbc092808c..aea2ca1f8b 100644
--- a/commit.c
+++ b/commit.c
@@ -296,6 +296,16 @@ void free_commit_buffer(struct commit *commit)
 	}
 }
 
+struct tree *get_commit_tree(const struct commit *commit)
+{
+	return commit->maybe_tree;
+}
+
+struct object_id *get_commit_tree_oid(const struct commit *commit)
+{
+	return &get_commit_tree(commit)->object.oid;
+}
+
 const void *detach_commit_buffer(struct commit *commit, unsigned long *sizep)
 {
 	struct commit_buffer *v = buffer_slab_peek(&buffer_slab, commit);
diff --git a/commit.h b/commit.h
index c4d6e6e064..dc4bf97d9f 100644
--- a/commit.h
+++ b/commit.h
@@ -102,6 +102,9 @@ void unuse_commit_buffer(const struct commit *, const void *buffer);
  */
 void free_commit_buffer(struct commit *);
 
+struct tree *get_commit_tree(const struct commit *);
+struct object_id *get_commit_tree_oid(const struct commit *);
+
 /*
  * Disassociate any cached object buffer from the commit, but do not free it.
  * The buffer (or NULL, if none) is returned.

-- 
2.17.0