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
builtin/update-index.c
View File

@ -83,7 +83,7 @@ static int process_lstat_error(const char *path, int err)
return error("lstat(\"%s\"): %s", path, strerror(errno));
}
static int add_one_path(struct cache_entry *old, const char *path, int len, struct stat *st)
static int add_one_path(const struct cache_entry *old, const char *path, int len, struct stat *st)
{
int option, size;
struct cache_entry *ce;
@ -142,7 +142,7 @@ static int process_directory(const char *path, int len, struct stat *st)
/* Exact match: file or existing gitlink */
if (pos >= 0) {
struct cache_entry *ce = active_cache[pos];
const struct cache_entry *ce = active_cache[pos];
if (S_ISGITLINK(ce->ce_mode)) {
/* Do nothing to the index if there is no HEAD! */
@ -158,7 +158,7 @@ static int process_directory(const char *path, int len, struct stat *st)
/* Inexact match: is there perhaps a subdirectory match? */
pos = -pos-1;
while (pos < active_nr) {
struct cache_entry *ce = active_cache[pos++];
const struct cache_entry *ce = active_cache[pos++];
if (strncmp(ce->name, path, len))
break;
@ -183,7 +183,7 @@ static int process_path(const char *path)
{
int pos, len;
struct stat st;
struct cache_entry *ce;
const struct cache_entry *ce;
len = strlen(path);
if (has_symlink_leading_path(path, len))
@ -448,7 +448,7 @@ static int unresolve_one(const char *path)
/* already merged */
pos = unmerge_cache_entry_at(pos);
if (pos < active_nr) {
struct cache_entry *ce = active_cache[pos];
const struct cache_entry *ce = active_cache[pos];
if (ce_stage(ce) &&
ce_namelen(ce) == namelen &&
!memcmp(ce->name, path, namelen))
@ -462,7 +462,7 @@ static int unresolve_one(const char *path)
*/
pos = -pos-1;
if (pos < active_nr) {
struct cache_entry *ce = active_cache[pos];
const struct cache_entry *ce = active_cache[pos];
if (ce_namelen(ce) == namelen &&
!memcmp(ce->name, path, namelen)) {
fprintf(stderr,
@ -558,7 +558,7 @@ static int do_reupdate(int ac, const char **av,
has_head = 0;
redo:
for (pos = 0; pos < active_nr; pos++) {
struct cache_entry *ce = active_cache[pos];
const struct cache_entry *ce = active_cache[pos];
struct cache_entry *old = NULL;
int save_nr;