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tree-walk.c: break circular dependency with unpack-trees

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The unpack-trees API depends on the tree-walk API. But we've recently
introduced a dependency in tree-walk.c on MAX_UNPACK_TREES, which
doesn't otherwise care about unpack-trees at all.

Let's break that dependency by reversing the constants: we'll introduce
a new MAX_TRAVERSE_TREES which belongs to the tree-walk API. And then we
can define MAX_UNPACK_TREES in terms of that (since unpack-trees cannot
possibly work with more trees than it can traverse at once via
tree-walk).

The value for both will remain at 8. This is somewhat arbitrary and
probably more than is necessary, per ca885a4fe6 (read-tree() and
unpack_trees(): use consistent limit, 2008-03-13), but there's not
really any pressing need to reduce it.

Suggested-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Jeff King <peff@peff.net>
Acked-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2020-02-01 06:39:22 -05:00 committed by Junio C Hamano
parent 8dd40c0472
commit 5290d45134
3 changed files with 4 additions and 3 deletions
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3
tree-walk.c
View file

@ -1,6 +1,5 @@
#include "cache.h"
#include "tree-walk.h"
#include "unpack-trees.h"
#include "dir.h"
#include "object-store.h"
#include "tree.h"
@ -410,7 +409,7 @@ int traverse_trees(struct index_state *istate,
struct traverse_info *info)
{
int error = 0;
struct name_entry entry[MAX_UNPACK_TREES];
struct name_entry entry[MAX_TRAVERSE_TREES];
int i;
struct tree_desc_x tx[ARRAY_SIZE(entry)];
struct strbuf base = STRBUF_INIT;

2
tree-walk.h
View file

@ -3,6 +3,8 @@
#include "cache.h"
#define MAX_TRAVERSE_TREES 8
/**
* The tree walking API is used to traverse and inspect trees.
*/

2
unpack-trees.h
View file

@ -6,7 +6,7 @@
#include "string-list.h"
#include "tree-walk.h"
#define MAX_UNPACK_TREES 8
#define MAX_UNPACK_TREES MAX_TRAVERSE_TREES
struct cache_entry;
struct unpack_trees_options;