mirrors/git
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Convert "struct cache_entry *" to "const ..." wherever possible

Browse Source 
I attempted to make index_state->cache[] a "const struct cache_entry **"
to find out how existing entries in index are modified and where. The
question I have is what do we do if we really need to keep track of on-disk
changes in the index. The result is

 - diff-lib.c: setting CE_UPTODATE

 - name-hash.c: setting CE_HASHED

 - preload-index.c, read-cache.c, unpack-trees.c and
   builtin/update-index: obvious

 - entry.c: write_entry() may refresh the checked out entry via
   fill_stat_cache_info(). This causes "non-const struct cache_entry
   *" in builtin/apply.c, builtin/checkout-index.c and
   builtin/checkout.c

 - builtin/ls-files.c: --with-tree changes stagemask and may set
   CE_UPDATE

Of these, write_entry() and its call sites are probably most
interesting because it modifies on-disk info. But this is stat info
and can be retrieved via refresh, at least for porcelain
commands. Other just uses ce_flags for local purposes.

So, keeping track of "dirty" entries is just a matter of setting a
flag in index modification functions exposed by read-cache.c. Except
unpack-trees, the rest of the code base does not do anything funny
behind read-cache's back.

The actual patch is less valueable than the summary above. But if
anyone wants to re-identify the above sites. Applying this patch, then
this:

    diff --git a/cache.h b/cache.h
    index 430d021..1692891 100644
    --- a/cache.h
    +++ b/cache.h
    @@ -267,7 +267,7 @@ static inline unsigned int canon_mode(unsigned int mode)
     #define cache_entry_size(len) (offsetof(struct cache_entry,name) + (len) + 1)

     struct index_state {
    -	struct cache_entry **cache;
    +	const struct cache_entry **cache;
     	unsigned int version;
     	unsigned int cache_nr, cache_alloc, cache_changed;
     	struct string_list *resolve_undo;

will help quickly identify them without bogus warnings.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy
2013-07-09 22:29:00 +07:00
committed by Junio C Hamano
parent f8abaebab3
commit 9c5e6c802c
29 changed files with 93 additions and 85 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
unpack-trees.c
View File

@ -179,7 +179,7 @@ static void display_error_msgs(struct unpack_trees_options *o)
* Unlink the last component and schedule the leading directories for
* removal, such that empty directories get removed.
*/
static void unlink_entry(struct cache_entry *ce)
static void unlink_entry(const struct cache_entry *ce)
{
if (!check_leading_path(ce->name, ce_namelen(ce)))
return;
@ -199,7 +199,7 @@ static int check_updates(struct unpack_trees_options *o)
if (o->update && o->verbose_update) {
for (total = cnt = 0; cnt < index->cache_nr; cnt++) {
struct cache_entry *ce = index->cache[cnt];
const struct cache_entry *ce = index->cache[cnt];
if (ce->ce_flags & (CE_UPDATE | CE_WT_REMOVE))
total++;
}
@ -212,7 +212,7 @@ static int check_updates(struct unpack_trees_options *o)
if (o->update)
git_attr_set_direction(GIT_ATTR_CHECKOUT, &o->result);
for (i = 0; i < index->cache_nr; i++) {
struct cache_entry *ce = index->cache[i];
const struct cache_entry *ce = index->cache[i];
if (ce->ce_flags & CE_WT_REMOVE) {
display_progress(progress, ++cnt);
@ -376,7 +376,7 @@ static struct cache_entry *next_cache_entry(struct unpack_trees_options *o)
return NULL;
}
static void add_same_unmerged(struct cache_entry *ce,
static void add_same_unmerged(const struct cache_entry *ce,
struct unpack_trees_options *o)
{
struct index_state *index = o->src_index;
@ -650,7 +650,7 @@ static int find_cache_pos(struct traverse_info *info,
int p_len = tree_entry_len(p);
for (pos = o->cache_bottom; pos < index->cache_nr; pos++) {
struct cache_entry *ce = index->cache[pos];
const struct cache_entry *ce = index->cache[pos];
const char *ce_name, *ce_slash;
int cmp, ce_len;
@ -1353,7 +1353,7 @@ static int verify_clean_subdirectory(const struct cache_entry *ce,
*/
static int icase_exists(struct unpack_trees_options *o, const char *name, int len, struct stat *st)
{
struct cache_entry *src;
const struct cache_entry *src;
src = index_name_exists(o->src_index, name, len, 1);
return src && !ie_match_stat(o->src_index, src, st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE);
@ -1364,7 +1364,7 @@ static int check_ok_to_remove(const char *name, int len, int dtype,
enum unpack_trees_error_types error_type,
struct unpack_trees_options *o)
{
struct cache_entry *result;
const struct cache_entry *result;
/*
* It may be that the 'lstat()' succeeded even though