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author | Jeff King <peff@peff.net> | 2014-07-13 02:42:03 -0400 |
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committer | Junio C Hamano <gitster@pobox.com> | 2014-07-28 10:14:33 -0700 |
commit | c4ad00f8ccb59a0ae0735e8e32b203d4bd835616 (patch) | |
tree | cf202fa4fc6d96a778c57ab2220a5b704490cc4e /tree.c | |
parent | fe0444b50b400a2c0b6263e8bd6ba464fea0ed4f (diff) | |
download | git-c4ad00f8ccb59a0ae0735e8e32b203d4bd835616.tar.gz git-c4ad00f8ccb59a0ae0735e8e32b203d4bd835616.tar.xz |
add object_as_type helper for casting objects
When we call lookup_commit, lookup_tree, etc, the logic goes
something like:
1. Look for an existing object struct. If we don't have
one, allocate and return a new one.
2. Double check that any object we have is the expected
type (and complain and return NULL otherwise).
3. Convert an object with type OBJ_NONE (from a prior
call to lookup_unknown_object) to the expected type.
We can encapsulate steps 2 and 3 in a helper function which
checks whether we have the expected object type, converts
OBJ_NONE as appropriate, and returns the object.
Not only does this shorten the code, but it also provides
one central location for converting OBJ_NONE objects into
objects of other types. Future patches will use that to
enforce type-specific invariants.
Since this is a refactoring, we would want it to behave
exactly as the current code. It takes a little reasoning to
see that this is the case:
- for lookup_{commit,tree,etc} functions, we are just
pulling steps 2 and 3 into a function that does the same
thing.
- for the call in peel_object, we currently only do step 3
(but we want to consolidate it with the others, as
mentioned above). However, step 2 is a noop here, as the
surrounding conditional makes sure we have OBJ_NONE
(which we want to keep to avoid an extraneous call to
sha1_object_info).
- for the call in lookup_commit_reference_gently, we are
currently doing step 2 but not step 3. However, step 3
is a noop here. The object we got will have just come
from deref_tag, which must have figured out the type for
each object in order to know when to stop peeling.
Therefore the type will never be OBJ_NONE.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'tree.c')
-rw-r--r-- | tree.c | 9 |
1 files changed, 1 insertions, 8 deletions
@@ -184,14 +184,7 @@ struct tree *lookup_tree(const unsigned char *sha1) struct object *obj = lookup_object(sha1); if (!obj) return create_object(sha1, alloc_tree_node()); - if (!obj->type) - obj->type = OBJ_TREE; - if (obj->type != OBJ_TREE) { - error("Object %s is a %s, not a tree", - sha1_to_hex(sha1), typename(obj->type)); - return NULL; - } - return (struct tree *) obj; + return object_as_type(obj, OBJ_TREE, 0); } int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size) |