git/diff-lib.c

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C
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/*
* Copyright (C) 2005 Junio C Hamano
*/
#include "cache.h"
#include "quote.h"
#include "commit.h"
#include "diff.h"
#include "diffcore.h"
#include "revision.h"
#include "cache-tree.h"
#include "path-list.h"
/*
* diff-files
*/
static int read_directory(const char *path, struct path_list *list)
{
DIR *dir;
struct dirent *e;
if (!(dir = opendir(path)))
return error("Could not open directory %s", path);
while ((e = readdir(dir)))
if (strcmp(".", e->d_name) && strcmp("..", e->d_name))
path_list_insert(e->d_name, list);
closedir(dir);
return 0;
}
static int get_mode(const char *path, int *mode)
{
struct stat st;
if (!path || !strcmp(path, "/dev/null"))
*mode = 0;
else if (!strcmp(path, "-"))
*mode = ntohl(create_ce_mode(0666));
else if (stat(path, &st))
return error("Could not access '%s'", path);
else
*mode = st.st_mode;
return 0;
}
static int queue_diff(struct diff_options *o,
const char *name1, const char *name2)
{
int mode1 = 0, mode2 = 0;
if (get_mode(name1, &mode1) || get_mode(name2, &mode2))
return -1;
if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2))
return error("file/directory conflict: %s, %s", name1, name2);
if (S_ISDIR(mode1) || S_ISDIR(mode2)) {
char buffer1[PATH_MAX], buffer2[PATH_MAX];
struct path_list p1 = {NULL, 0, 0, 1}, p2 = {NULL, 0, 0, 1};
int len1 = 0, len2 = 0, i1, i2, ret = 0;
if (name1 && read_directory(name1, &p1))
return -1;
if (name2 && read_directory(name2, &p2)) {
path_list_clear(&p1, 0);
return -1;
}
if (name1) {
len1 = strlen(name1);
if (len1 > 0 && name1[len1 - 1] == '/')
len1--;
memcpy(buffer1, name1, len1);
buffer1[len1++] = '/';
}
if (name2) {
len2 = strlen(name2);
if (len2 > 0 && name2[len2 - 1] == '/')
len2--;
memcpy(buffer2, name2, len2);
buffer2[len2++] = '/';
}
for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) {
const char *n1, *n2;
int comp;
if (i1 == p1.nr)
comp = 1;
else if (i2 == p2.nr)
comp = -1;
else
comp = strcmp(p1.items[i1].path,
p2.items[i2].path);
if (comp > 0)
n1 = NULL;
else {
n1 = buffer1;
strncpy(buffer1 + len1, p1.items[i1++].path,
PATH_MAX - len1);
}
if (comp < 0)
n2 = NULL;
else {
n2 = buffer2;
strncpy(buffer2 + len2, p2.items[i2++].path,
PATH_MAX - len2);
}
ret = queue_diff(o, n1, n2);
}
path_list_clear(&p1, 0);
path_list_clear(&p2, 0);
return ret;
} else {
struct diff_filespec *d1, *d2;
if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
unsigned tmp;
const char *tmp_c;
tmp = mode1; mode1 = mode2; mode2 = tmp;
tmp_c = name1; name1 = name2; name2 = tmp_c;
}
if (!name1)
name1 = "/dev/null";
if (!name2)
name2 = "/dev/null";
d1 = alloc_filespec(name1);
d2 = alloc_filespec(name2);
fill_filespec(d1, null_sha1, mode1);
fill_filespec(d2, null_sha1, mode2);
diff_queue(&diff_queued_diff, d1, d2);
return 0;
}
}
/*
* Does the path name a blob in the working tree, or a directory
* in the working tree?
*/
static int is_in_index(const char *path)
{
int len, pos;
struct cache_entry *ce;
len = strlen(path);
while (path[len-1] == '/')
len--;
if (!len)
return 1; /* "." */
pos = cache_name_pos(path, len);
if (0 <= pos)
return 1;
pos = -1 - pos;
while (pos < active_nr) {
ce = active_cache[pos++];
if (ce_namelen(ce) <= len ||
strncmp(ce->name, path, len) ||
(ce->name[len] > '/'))
break; /* path cannot be a prefix */
if (ce->name[len] == '/')
return 1;
}
return 0;
}
static int handle_diff_files_args(struct rev_info *revs,
int argc, const char **argv,
unsigned int *options)
{
*options = 0;
/* revs->max_count == -2 means --no-index */
while (1 < argc && argv[1][0] == '-') {
if (!strcmp(argv[1], "--base"))
revs->max_count = 1;
else if (!strcmp(argv[1], "--ours"))
revs->max_count = 2;
else if (!strcmp(argv[1], "--theirs"))
revs->max_count = 3;
else if (!strcmp(argv[1], "-n") ||
!strcmp(argv[1], "--no-index")) {
revs->max_count = -2;
DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);
DIFF_OPT_SET(&revs->diffopt, NO_INDEX);
}
else if (!strcmp(argv[1], "-q"))
*options |= DIFF_SILENT_ON_REMOVED;
else
return error("invalid option: %s", argv[1]);
argv++; argc--;
}
if (revs->max_count == -1 && revs->diffopt.nr_paths == 2) {
/*
* If two files are specified, and at least one is untracked,
* default to no-index.
*/
read_cache();
if (!is_in_index(revs->diffopt.paths[0]) ||
!is_in_index(revs->diffopt.paths[1])) {
revs->max_count = -2;
DIFF_OPT_SET(&revs->diffopt, NO_INDEX);
}
}
/*
* Make sure there are NO revision (i.e. pending object) parameter,
* rev.max_count is reasonable (0 <= n <= 3),
* there is no other revision filtering parameters.
*/
if (revs->pending.nr || revs->max_count > 3 ||
revs->min_age != -1 || revs->max_age != -1)
return error("no revision allowed with diff-files");
if (revs->max_count == -1 &&
(revs->diffopt.output_format & DIFF_FORMAT_PATCH))
revs->combine_merges = revs->dense_combined_merges = 1;
return 0;
}
static int is_outside_repo(const char *path, int nongit, const char *prefix)
{
int i;
if (nongit || !strcmp(path, "-") || is_absolute_path(path))
return 1;
if (prefixcmp(path, "../"))
return 0;
if (!prefix)
return 1;
for (i = strlen(prefix); !prefixcmp(path, "../"); ) {
while (i > 0 && prefix[i - 1] != '/')
i--;
if (--i < 0)
return 1;
path += 3;
}
return 0;
}
int setup_diff_no_index(struct rev_info *revs,
int argc, const char ** argv, int nongit, const char *prefix)
{
int i;
for (i = 1; i < argc; i++)
if (argv[i][0] != '-' || argv[i][1] == '\0')
break;
else if (!strcmp(argv[i], "--")) {
i++;
break;
} else if (i < argc - 3 && !strcmp(argv[i], "--no-index")) {
i = argc - 3;
DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);
break;
}
if (argc != i + 2 || (!is_outside_repo(argv[i + 1], nongit, prefix) &&
!is_outside_repo(argv[i], nongit, prefix)))
return -1;
diff_setup(&revs->diffopt);
for (i = 1; i < argc - 2; )
if (!strcmp(argv[i], "--no-index"))
i++;
else {
int j = diff_opt_parse(&revs->diffopt,
argv + i, argc - i);
if (!j)
die("invalid diff option/value: %s", argv[i]);
i += j;
}
if (prefix) {
int len = strlen(prefix);
revs->diffopt.paths = xcalloc(2, sizeof(char*));
for (i = 0; i < 2; i++) {
const char *p = argv[argc - 2 + i];
/*
* stdin should be spelled as '-'; if you have
* path that is '-', spell it as ./-.
*/
p = (strcmp(p, "-")
? xstrdup(prefix_filename(prefix, len, p))
: p);
revs->diffopt.paths[i] = p;
}
}
else
revs->diffopt.paths = argv + argc - 2;
revs->diffopt.nr_paths = 2;
DIFF_OPT_SET(&revs->diffopt, NO_INDEX);
revs->max_count = -2;
if (diff_setup_done(&revs->diffopt) < 0)
die("diff_setup_done failed");
return 0;
}
int run_diff_files_cmd(struct rev_info *revs, int argc, const char **argv)
{
unsigned int options;
if (handle_diff_files_args(revs, argc, argv, &options))
return -1;
if (DIFF_OPT_TST(&revs->diffopt, NO_INDEX)) {
if (revs->diffopt.nr_paths != 2)
return error("need two files/directories with --no-index");
if (queue_diff(&revs->diffopt, revs->diffopt.paths[0],
revs->diffopt.paths[1]))
return -1;
diffcore_std(&revs->diffopt);
diff_flush(&revs->diffopt);
/*
* The return code for --no-index imitates diff(1):
* 0 = no changes, 1 = changes, else error
*/
return revs->diffopt.found_changes;
}
if (read_cache() < 0) {
perror("read_cache");
return -1;
}
return run_diff_files(revs, options);
}
int run_diff_files(struct rev_info *revs, unsigned int option)
{
int entries, i;
int diff_unmerged_stage = revs->max_count;
int silent_on_removed = option & DIFF_SILENT_ON_REMOVED;
git-add: make the entry stat-clean after re-adding the same contents Earlier in commit 0781b8a9b2fe760fc4ed519a3a26e4b9bd6ccffe (add_file_to_index: skip rehashing if the cached stat already matches), add_file_to_index() were taught not to re-add the path if it already matches the index. The change meant well, but was not executed quite right. It used ie_modified() to see if the file on the work tree is really different from the index, and skipped adding the contents if the function says "not modified". This was wrong. There are three possible comparison results between the index and the file in the work tree: - with lstat(2) we _know_ they are different. E.g. if the length or the owner in the cached stat information is different from the length we just obtained from lstat(2), we can tell the file is modified without looking at the actual contents. - with lstat(2) we _know_ they are the same. The same length, the same owner, the same everything (but this has a twist, as described below). - we cannot tell from lstat(2) information alone and need to go to the filesystem to actually compare. The last case arises from what we call 'racy git' situation, that can be caused with this sequence: $ echo hello >file $ git add file $ echo aeiou >file ;# the same length If the second "echo" is done within the same filesystem timestamp granularity as the first "echo", then the timestamp recorded by "git add" and the timestamp we get from lstat(2) will be the same, and we can mistakenly say the file is not modified. The path is called 'racily clean'. We need to reliably detect racily clean paths are in fact modified. To solve this problem, when we write out the index, we mark the index entry that has the same timestamp as the index file itself (that is the time from the point of view of the filesystem) to tell any later code that does the lstat(2) comparison not to trust the cached stat info, and ie_modified() then actually goes to the filesystem to compare the contents for such a path. That's all good, but it should not be used for this "git add" optimization, as the goal of "git add" is to actually update the path in the index and make it stat-clean. With the false optimization, we did _not_ cause any data loss (after all, what we failed to do was only to update the cached stat information), but it made the following sequence leave the file stat dirty: $ echo hello >file $ git add file $ echo hello >file ;# the same contents $ git add file The solution is not to use ie_modified() which goes to the filesystem to see if it is really clean, but instead use ie_match_stat() with "assume racily clean paths are dirty" option, to force re-adding of such a path. There was another problem with "git add -u". The codepath shares the same issue when adding the paths that are found to be modified, but in addition, it asked "git diff-files" machinery run_diff_files() function (which is "git diff-files") to list the paths that are modified. But "git diff-files" machinery uses the same ie_modified() call so that it does not report racily clean _and_ actually clean paths as modified, which is not what we want. The patch allows the callers of run_diff_files() to pass the same "assume racily clean paths are dirty" option, and makes "git-add -u" codepath to use that option, to discover and re-add racily clean _and_ actually clean paths. We could further optimize on top of this patch to differentiate the case where the path really needs re-adding (i.e. the content of the racily clean entry was indeed different) and the case where only the cached stat information needs to be refreshed (i.e. the racily clean entry was actually clean), but I do not think it is worth it. This patch applies to maint and all the way up. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-11-10 05:22:52 +03:00
unsigned ce_option = ((option & DIFF_RACY_IS_MODIFIED)
? CE_MATCH_RACY_IS_DIRTY : 0);
if (diff_unmerged_stage < 0)
diff_unmerged_stage = 2;
entries = active_nr;
for (i = 0; i < entries; i++) {
struct stat st;
unsigned int oldmode, newmode;
struct cache_entry *ce = active_cache[i];
int changed;
if (DIFF_OPT_TST(&revs->diffopt, QUIET) &&
DIFF_OPT_TST(&revs->diffopt, HAS_CHANGES))
break;
if (!ce_path_match(ce, revs->prune_data))
continue;
if (ce_stage(ce)) {
struct combine_diff_path *dpath;
int num_compare_stages = 0;
size_t path_len;
path_len = ce_namelen(ce);
dpath = xmalloc(combine_diff_path_size(5, path_len));
dpath->path = (char *) &(dpath->parent[5]);
dpath->next = NULL;
dpath->len = path_len;
memcpy(dpath->path, ce->name, path_len);
dpath->path[path_len] = '\0';
hashclr(dpath->sha1);
memset(&(dpath->parent[0]), 0,
sizeof(struct combine_diff_parent)*5);
if (lstat(ce->name, &st) < 0) {
if (errno != ENOENT && errno != ENOTDIR) {
perror(ce->name);
continue;
}
if (silent_on_removed)
continue;
}
else
dpath->mode = ntohl(ce_mode_from_stat(ce, st.st_mode));
while (i < entries) {
struct cache_entry *nce = active_cache[i];
int stage;
if (strcmp(ce->name, nce->name))
break;
/* Stage #2 (ours) is the first parent,
* stage #3 (theirs) is the second.
*/
stage = ce_stage(nce);
if (2 <= stage) {
int mode = ntohl(nce->ce_mode);
num_compare_stages++;
hashcpy(dpath->parent[stage-2].sha1, nce->sha1);
dpath->parent[stage-2].mode = ntohl(ce_mode_from_stat(nce, mode));
dpath->parent[stage-2].status =
DIFF_STATUS_MODIFIED;
}
/* diff against the proper unmerged stage */
if (stage == diff_unmerged_stage)
ce = nce;
i++;
}
/*
* Compensate for loop update
*/
i--;
if (revs->combine_merges && num_compare_stages == 2) {
show_combined_diff(dpath, 2,
revs->dense_combined_merges,
revs);
free(dpath);
continue;
}
free(dpath);
dpath = NULL;
/*
* Show the diff for the 'ce' if we found the one
* from the desired stage.
*/
diff_unmerge(&revs->diffopt, ce->name, 0, null_sha1);
if (ce_stage(ce) != diff_unmerged_stage)
continue;
[PATCH] diff: Update -B heuristics. As Linus pointed out on the mailing list discussion, -B should break a files that has many inserts even if it still keeps enough of the original contents, so that the broken pieces can later be matched with other files by -M or -C. However, if such a broken pair does not get picked up by -M or -C, we would want to apply different criteria; namely, regardless of the amount of new material in the result, the determination of "rewrite" should be done by looking at the amount of original material still left in the result. If you still have the original 97 lines from a 100-line document, it does not matter if you add your own 13 lines to make a 110-line document, or if you add 903 lines to make a 1000-line document. It is not a rewrite but an in-place edit. On the other hand, if you did lose 97 lines from the original, it does not matter if you added 27 lines to make a 30-line document or if you added 997 lines to make a 1000-line document. You did a complete rewrite in either case. This patch introduces a post-processing phase that runs after diffcore-rename matches up broken pairs diffcore-break creates. The purpose of this post-processing is to pick up these broken pieces and merge them back into in-place modifications. For this, the score parameter -B option takes is changed into a pair of numbers, and it takes "-B99/80" format when fully spelled out. The first number is the minimum amount of "edit" (same definition as what diffcore-rename uses, which is "sum of deletion and insertion") that a modification needs to have to be broken, and the second number is the minimum amount of "delete" a surviving broken pair must have to avoid being merged back together. It can be abbreviated to "-B" to use default for both, "-B9" or "-B9/" to use 90% for "edit" but default (80%) for merge avoidance, or "-B/75" to use default (99%) "edit" and 75% for merge avoidance. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-03 12:40:28 +04:00
}
if (lstat(ce->name, &st) < 0) {
if (errno != ENOENT && errno != ENOTDIR) {
perror(ce->name);
continue;
}
if (silent_on_removed)
continue;
diff_addremove(&revs->diffopt, '-', ntohl(ce->ce_mode),
ce->sha1, ce->name, NULL);
continue;
}
git-add: make the entry stat-clean after re-adding the same contents Earlier in commit 0781b8a9b2fe760fc4ed519a3a26e4b9bd6ccffe (add_file_to_index: skip rehashing if the cached stat already matches), add_file_to_index() were taught not to re-add the path if it already matches the index. The change meant well, but was not executed quite right. It used ie_modified() to see if the file on the work tree is really different from the index, and skipped adding the contents if the function says "not modified". This was wrong. There are three possible comparison results between the index and the file in the work tree: - with lstat(2) we _know_ they are different. E.g. if the length or the owner in the cached stat information is different from the length we just obtained from lstat(2), we can tell the file is modified without looking at the actual contents. - with lstat(2) we _know_ they are the same. The same length, the same owner, the same everything (but this has a twist, as described below). - we cannot tell from lstat(2) information alone and need to go to the filesystem to actually compare. The last case arises from what we call 'racy git' situation, that can be caused with this sequence: $ echo hello >file $ git add file $ echo aeiou >file ;# the same length If the second "echo" is done within the same filesystem timestamp granularity as the first "echo", then the timestamp recorded by "git add" and the timestamp we get from lstat(2) will be the same, and we can mistakenly say the file is not modified. The path is called 'racily clean'. We need to reliably detect racily clean paths are in fact modified. To solve this problem, when we write out the index, we mark the index entry that has the same timestamp as the index file itself (that is the time from the point of view of the filesystem) to tell any later code that does the lstat(2) comparison not to trust the cached stat info, and ie_modified() then actually goes to the filesystem to compare the contents for such a path. That's all good, but it should not be used for this "git add" optimization, as the goal of "git add" is to actually update the path in the index and make it stat-clean. With the false optimization, we did _not_ cause any data loss (after all, what we failed to do was only to update the cached stat information), but it made the following sequence leave the file stat dirty: $ echo hello >file $ git add file $ echo hello >file ;# the same contents $ git add file The solution is not to use ie_modified() which goes to the filesystem to see if it is really clean, but instead use ie_match_stat() with "assume racily clean paths are dirty" option, to force re-adding of such a path. There was another problem with "git add -u". The codepath shares the same issue when adding the paths that are found to be modified, but in addition, it asked "git diff-files" machinery run_diff_files() function (which is "git diff-files") to list the paths that are modified. But "git diff-files" machinery uses the same ie_modified() call so that it does not report racily clean _and_ actually clean paths as modified, which is not what we want. The patch allows the callers of run_diff_files() to pass the same "assume racily clean paths are dirty" option, and makes "git-add -u" codepath to use that option, to discover and re-add racily clean _and_ actually clean paths. We could further optimize on top of this patch to differentiate the case where the path really needs re-adding (i.e. the content of the racily clean entry was indeed different) and the case where only the cached stat information needs to be refreshed (i.e. the racily clean entry was actually clean), but I do not think it is worth it. This patch applies to maint and all the way up. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-11-10 05:22:52 +03:00
changed = ce_match_stat(ce, &st, ce_option);
if (!changed && !DIFF_OPT_TST(&revs->diffopt, FIND_COPIES_HARDER))
continue;
oldmode = ntohl(ce->ce_mode);
newmode = ntohl(ce_mode_from_stat(ce, st.st_mode));
diff_change(&revs->diffopt, oldmode, newmode,
ce->sha1, (changed ? null_sha1 : ce->sha1),
ce->name, NULL);
}
diffcore_std(&revs->diffopt);
diff_flush(&revs->diffopt);
return 0;
}
/*
* diff-index
*/
/* A file entry went away or appeared */
static void diff_index_show_file(struct rev_info *revs,
const char *prefix,
struct cache_entry *ce,
unsigned char *sha1, unsigned int mode)
{
diff_addremove(&revs->diffopt, prefix[0], ntohl(mode),
sha1, ce->name, NULL);
}
static int get_stat_data(struct cache_entry *ce,
unsigned char **sha1p,
unsigned int *modep,
int cached, int match_missing)
{
unsigned char *sha1 = ce->sha1;
unsigned int mode = ce->ce_mode;
if (!cached) {
static unsigned char no_sha1[20];
int changed;
struct stat st;
if (lstat(ce->name, &st) < 0) {
if (errno == ENOENT && match_missing) {
*sha1p = sha1;
*modep = mode;
return 0;
}
return -1;
}
changed = ce_match_stat(ce, &st, 0);
if (changed) {
mode = ce_mode_from_stat(ce, st.st_mode);
sha1 = no_sha1;
}
}
*sha1p = sha1;
*modep = mode;
return 0;
}
static void show_new_file(struct rev_info *revs,
struct cache_entry *new,
int cached, int match_missing)
{
unsigned char *sha1;
unsigned int mode;
/* New file in the index: it might actually be different in
* the working copy.
*/
if (get_stat_data(new, &sha1, &mode, cached, match_missing) < 0)
return;
diff_index_show_file(revs, "+", new, sha1, mode);
}
static int show_modified(struct rev_info *revs,
struct cache_entry *old,
struct cache_entry *new,
int report_missing,
int cached, int match_missing)
{
unsigned int mode, oldmode;
unsigned char *sha1;
if (get_stat_data(new, &sha1, &mode, cached, match_missing) < 0) {
if (report_missing)
diff_index_show_file(revs, "-", old,
old->sha1, old->ce_mode);
return -1;
}
if (revs->combine_merges && !cached &&
(hashcmp(sha1, old->sha1) || hashcmp(old->sha1, new->sha1))) {
struct combine_diff_path *p;
int pathlen = ce_namelen(new);
p = xmalloc(combine_diff_path_size(2, pathlen));
p->path = (char *) &p->parent[2];
p->next = NULL;
p->len = pathlen;
memcpy(p->path, new->name, pathlen);
p->path[pathlen] = 0;
p->mode = ntohl(mode);
hashclr(p->sha1);
memset(p->parent, 0, 2 * sizeof(struct combine_diff_parent));
p->parent[0].status = DIFF_STATUS_MODIFIED;
p->parent[0].mode = ntohl(new->ce_mode);
hashcpy(p->parent[0].sha1, new->sha1);
p->parent[1].status = DIFF_STATUS_MODIFIED;
p->parent[1].mode = ntohl(old->ce_mode);
hashcpy(p->parent[1].sha1, old->sha1);
show_combined_diff(p, 2, revs->dense_combined_merges, revs);
free(p);
return 0;
}
oldmode = old->ce_mode;
if (mode == oldmode && !hashcmp(sha1, old->sha1) &&
!DIFF_OPT_TST(&revs->diffopt, FIND_COPIES_HARDER))
return 0;
mode = ntohl(mode);
oldmode = ntohl(oldmode);
diff_change(&revs->diffopt, oldmode, mode,
old->sha1, sha1, old->name, NULL);
return 0;
}
static int diff_cache(struct rev_info *revs,
struct cache_entry **ac, int entries,
const char **pathspec,
int cached, int match_missing)
{
while (entries) {
struct cache_entry *ce = *ac;
int same = (entries > 1) && ce_same_name(ce, ac[1]);
if (DIFF_OPT_TST(&revs->diffopt, QUIET) &&
DIFF_OPT_TST(&revs->diffopt, HAS_CHANGES))
break;
if (!ce_path_match(ce, pathspec))
goto skip_entry;
switch (ce_stage(ce)) {
case 0:
/* No stage 1 entry? That means it's a new file */
if (!same) {
show_new_file(revs, ce, cached, match_missing);
break;
}
/* Show difference between old and new */
show_modified(revs, ac[1], ce, 1,
cached, match_missing);
break;
case 1:
/* No stage 3 (merge) entry?
* That means it's been deleted.
*/
if (!same) {
diff_index_show_file(revs, "-", ce,
ce->sha1, ce->ce_mode);
break;
}
/* We come here with ce pointing at stage 1
* (original tree) and ac[1] pointing at stage
* 3 (unmerged). show-modified with
* report-missing set to false does not say the
* file is deleted but reports true if work
* tree does not have it, in which case we
* fall through to report the unmerged state.
* Otherwise, we show the differences between
* the original tree and the work tree.
*/
if (!cached &&
!show_modified(revs, ce, ac[1], 0,
cached, match_missing))
break;
diff_unmerge(&revs->diffopt, ce->name,
ntohl(ce->ce_mode), ce->sha1);
break;
case 3:
diff_unmerge(&revs->diffopt, ce->name,
0, null_sha1);
break;
default:
die("impossible cache entry stage");
}
skip_entry:
/*
* Ignore all the different stages for this file,
* we've handled the relevant cases now.
*/
do {
ac++;
entries--;
} while (entries && ce_same_name(ce, ac[0]));
}
return 0;
}
/*
* This turns all merge entries into "stage 3". That guarantees that
* when we read in the new tree (into "stage 1"), we won't lose sight
* of the fact that we had unmerged entries.
*/
static void mark_merge_entries(void)
{
int i;
for (i = 0; i < active_nr; i++) {
struct cache_entry *ce = active_cache[i];
if (!ce_stage(ce))
continue;
ce->ce_flags |= htons(CE_STAGEMASK);
}
}
int run_diff_index(struct rev_info *revs, int cached)
{
int ret;
struct object *ent;
struct tree *tree;
const char *tree_name;
int match_missing = 0;
/*
* Backward compatibility wart - "diff-index -m" does
* not mean "do not ignore merges", but totally different.
*/
if (!revs->ignore_merges)
match_missing = 1;
mark_merge_entries();
Add "named object array" concept We've had this notion of a "object_list" for a long time, which eventually grew a "name" member because some users (notably git-rev-list) wanted to name each object as it is generated. That object_list is great for some things, but it isn't all that wonderful for others, and the "name" member is generally not used by everybody. This patch splits the users of the object_list array up into two: the traditional list users, who want the list-like format, and who don't actually use or want the name. And another class of users that really used the list as an extensible array, and generally wanted to name the objects. The patch is fairly straightforward, but it's also biggish. Most of it really just cleans things up: switching the revision parsing and listing over to the array makes things like the builtin-diff usage much simpler (we now see exactly how many members the array has, and we don't get the objects reversed from the order they were on the command line). One of the main reasons for doing this at all is that the malloc overhead of the simple object list was actually pretty high, and the array is just a lot denser. So this patch brings down memory usage by git-rev-list by just under 3% (on top of all the other memory use optimizations) on the mozilla archive. It does add more lines than it removes, and more importantly, it adds a whole new infrastructure for maintaining lists of objects, but on the other hand, the new dynamic array code is pretty obvious. The change to builtin-diff-tree.c shows a fairly good example of why an array interface is sometimes more natural, and just much simpler for everybody. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-06-20 04:42:35 +04:00
ent = revs->pending.objects[0].item;
tree_name = revs->pending.objects[0].name;
tree = parse_tree_indirect(ent->sha1);
if (!tree)
return error("bad tree object %s", tree_name);
if (read_tree(tree, 1, revs->prune_data))
return error("unable to read tree object %s", tree_name);
ret = diff_cache(revs, active_cache, active_nr, revs->prune_data,
cached, match_missing);
diffcore_std(&revs->diffopt);
diff_flush(&revs->diffopt);
return ret;
}
int do_diff_cache(const unsigned char *tree_sha1, struct diff_options *opt)
{
struct tree *tree;
struct rev_info revs;
int i;
struct cache_entry **dst;
struct cache_entry *last = NULL;
/*
* This is used by git-blame to run diff-cache internally;
* it potentially needs to repeatedly run this, so we will
* start by removing the higher order entries the last round
* left behind.
*/
dst = active_cache;
for (i = 0; i < active_nr; i++) {
struct cache_entry *ce = active_cache[i];
if (ce_stage(ce)) {
if (last && !strcmp(ce->name, last->name))
continue;
cache_tree_invalidate_path(active_cache_tree,
ce->name);
last = ce;
ce->ce_mode = 0;
ce->ce_flags &= ~htons(CE_STAGEMASK);
}
*dst++ = ce;
}
active_nr = dst - active_cache;
init_revisions(&revs, NULL);
revs.prune_data = opt->paths;
tree = parse_tree_indirect(tree_sha1);
if (!tree)
die("bad tree object %s", sha1_to_hex(tree_sha1));
if (read_tree(tree, 1, opt->paths))
return error("unable to read tree %s", sha1_to_hex(tree_sha1));
return diff_cache(&revs, active_cache, active_nr, revs.prune_data,
1, 0);
}