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fsck: drop unused parameter from traverse_one_object()

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Also add comments to seemingly unsafe pointer dereferences, that
are all safe.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2011-01-26 12:46:55 -08:00
parent d2d434beeb
commit a1cdc25172
1 changed files with 10 additions and 3 deletions
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13
builtin/fsck.c
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@ -74,7 +74,13 @@ static int mark_object(struct object *obj, int type, void *data)
{ {
struct object *parent = data; struct object *parent = data;
/*
* The only case data is NULL or type is OBJ_ANY is when
* mark_object_reachable() calls us. All the callers of
* that function has non-NULL obj hence ...
*/
if (!obj) { if (!obj) {
/* ... these references to parent->fld are safe here */
printf("broken link from %7s %s\n", printf("broken link from %7s %s\n",
typename(parent->type), sha1_to_hex(parent->sha1)); typename(parent->type), sha1_to_hex(parent->sha1));
printf("broken link from %7s %s\n", printf("broken link from %7s %s\n",
@ -84,6 +90,7 @@ static int mark_object(struct object *obj, int type, void *data)
} }
if (type != OBJ_ANY && obj->type != type) if (type != OBJ_ANY && obj->type != type)
/* ... and the reference to parent is safe here */
objerror(parent, "wrong object type in link"); objerror(parent, "wrong object type in link");
if (obj->flags & REACHABLE) if (obj->flags & REACHABLE)
@ -109,7 +116,7 @@ static void mark_object_reachable(struct object *obj)
mark_object(obj, OBJ_ANY, NULL); mark_object(obj, OBJ_ANY, NULL);
} }
static int traverse_one_object(struct object *obj, struct object *parent) static int traverse_one_object(struct object *obj)
{ {
int result; int result;
struct tree *tree = NULL; struct tree *tree = NULL;
@ -138,7 +145,7 @@ static int traverse_reachable(void)
entry = pending.objects + --pending.nr; entry = pending.objects + --pending.nr;
obj = entry->item; obj = entry->item;
parent = (struct object *) entry->name; parent = (struct object *) entry->name;
result |= traverse_one_object(obj, parent); result |= traverse_one_object(obj);
} }
return !!result; return !!result;
} }
@ -556,8 +563,8 @@ static int fsck_cache_tree(struct cache_tree *it)
sha1_to_hex(it->sha1)); sha1_to_hex(it->sha1));
return 1; return 1;
} }
mark_object_reachable(obj);
obj->used = 1; obj->used = 1;
mark_object_reachable(obj);
if (obj->type != OBJ_TREE) if (obj->type != OBJ_TREE)
err |= objerror(obj, "non-tree in cache-tree"); err |= objerror(obj, "non-tree in cache-tree");
} }