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commit: create get_commit_tree() method 

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>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee 2018-04-06 19:09:34 +00:00 committed by Junio C Hamano
parent 891435d55d
commit 5bb03de102
2 changed files with 13 additions and 0 deletions
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10
commit.c
View File

@ -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);

3
commit.h
View File

@ -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.