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merge-ort: remove compile-time ability to turn off usage of memory pools 

Simplify code maintenance by removing the ability to toggle between
usage of memory pools and direct allocations.  This allows us to also
remove paths_to_free since it was solely about bookkeeping to make sure
we freed the necessary paths, and allows us to remove some auxiliary
functions.

Suggested-by: Jeff King <peff@peff.net>
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Elijah Newren 2021-07-31 17:27:38 +00:00 коммит произвёл Junio C Hamano
Родитель 092e5115d1
Коммит 62a15162fe
1 изменённых файлов: 47 добавлений и 162 удалений
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209
merge-ort.c
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@ -37,8 +37,6 @@
#include "unpack-trees.h"
#include "xdiff-interface.h"
#define USE_MEMORY_POOL 1 /* faster, but obscures memory leak hunting */
/*
* We have many arrays of size 3. Whenever we have such an array, the
* indices refer to one of the sides of the three-way merge. This is so
@ -305,8 +303,6 @@ struct merge_options_internal {
* * these keys serve to intern all the path strings, which allows
* us to do pointer comparison on directory names instead of
* strcmp; we just have to be careful to use the interned strings.
* (Technically paths_to_free may track some strings that were
* removed from froms paths.)
*
* The values of paths:
* * either a pointer to a merged_info, or a conflict_info struct
@ -349,18 +345,7 @@ struct merge_options_internal {
* freed together too. Using a memory pool for these provides a
* nice speedup.
*/
struct mem_pool internal_pool;
struct mem_pool *pool; /* NULL, or pointer to internal_pool */
/*
* paths_to_free: additional list of strings to free
*
* If keys are removed from "paths", they are added to paths_to_free
* to ensure they are later freed. We avoid free'ing immediately since
* other places (e.g. conflict_info.pathnames[]) may still be
* referencing these paths.
*/
struct string_list paths_to_free;
struct mem_pool pool;
/*
* output: special messages and conflict notices for various paths
@ -539,19 +524,7 @@ static void clear_or_reinit_internal_opts(struct merge_options_internal *opti,
void (*strset_clear_func)(struct strset *) =
reinitialize ? strset_partial_clear : strset_clear;
if (opti->pool)
strmap_clear_func(&opti->paths, 0);
else {
/*
* We marked opti->paths with strdup_strings = 0, so that
* we wouldn't have to make another copy of the fullpath
* created by make_traverse_path from setup_path_info().
* But, now that we've used it and have no other references
* to these strings, it is time to deallocate them.
*/
free_strmap_strings(&opti->paths);
strmap_clear_func(&opti->paths, 1);
}
strmap_clear_func(&opti->paths, 0);
/*
* All keys and values in opti->conflicted are a subset of those in
@ -560,20 +533,6 @@ static void clear_or_reinit_internal_opts(struct merge_options_internal *opti,
*/
strmap_clear_func(&opti->conflicted, 0);
if (!opti->pool) {
/*
* opti->paths_to_free is similar to opti->paths; we
* created it with strdup_strings = 0 to avoid making
* _another_ copy of the fullpath but now that we've used
* it and have no other references to these strings, it is
* time to deallocate them. We do so by temporarily
* setting strdup_strings to 1.
*/
opti->paths_to_free.strdup_strings = 1;
string_list_clear(&opti->paths_to_free, 0);
opti->paths_to_free.strdup_strings = 0;
}
if (opti->attr_index.cache_nr) /* true iff opt->renormalize */
discard_index(&opti->attr_index);
@ -623,11 +582,7 @@ static void clear_or_reinit_internal_opts(struct merge_options_internal *opti,
strmap_clear(&opti->output, 0);
}
#if USE_MEMORY_POOL
mem_pool_discard(&opti->internal_pool, 0);
if (!reinitialize)
opti->pool = NULL;
#endif
mem_pool_discard(&opti->pool, 0);
/* Clean out callback_data as well. */
FREE_AND_NULL(renames->callback_data);
@ -693,12 +648,9 @@ static void path_msg(struct merge_options *opt,
static struct diff_filespec *pool_alloc_filespec(struct mem_pool *pool,
const char *path)
{
/* Similar to alloc_filespec(), but allocate from pool and reuse path */
struct diff_filespec *spec;
if (!pool)
return alloc_filespec(path);
/* Similar to alloc_filespec, but allocate from pool and reuse path */
spec = mem_pool_calloc(pool, 1, sizeof(*spec));
spec->path = (char*)path; /* spec won't modify it */
@ -712,12 +664,9 @@ static struct diff_filepair *pool_diff_queue(struct mem_pool *pool,
struct diff_filespec *one,
struct diff_filespec *two)
{
/* Same code as diff_queue(), except allocate from pool */
struct diff_filepair *dp;
if (!pool)
return diff_queue(queue, one, two);
/* Same code as diff_queue, except allocate from pool */
dp = mem_pool_calloc(pool, 1, sizeof(*dp));
dp->one = one;
dp->two = two;
@ -726,27 +675,6 @@ static struct diff_filepair *pool_diff_queue(struct mem_pool *pool,
return dp;
}
static void *pool_calloc(struct mem_pool *pool, size_t count, size_t size)
{
if (!pool)
return xcalloc(count, size);
return mem_pool_calloc(pool, count, size);
}
static void *pool_alloc(struct mem_pool *pool, size_t size)
{
if (!pool)
return xmalloc(size);
return mem_pool_alloc(pool, size);
}
static void *pool_strndup(struct mem_pool *pool, const char *str, size_t len)
{
if (!pool)
return xstrndup(str, len);
return mem_pool_strndup(pool, str, len);
}
/* add a string to a strbuf, but converting "/" to "_" */
static void add_flattened_path(struct strbuf *out, const char *s)
{
@ -875,9 +803,9 @@ static void setup_path_info(struct merge_options *opt,
assert(!df_conflict || !resolved); /* df_conflict implies !resolved */
assert(resolved == (merged_version != NULL));
mi = pool_calloc(opt->priv->pool, 1,
resolved ? sizeof(struct merged_info) :
sizeof(struct conflict_info));
mi = mem_pool_calloc(&opt->priv->pool, 1,
resolved ? sizeof(struct merged_info) :
sizeof(struct conflict_info));
mi->directory_name = current_dir_name;
mi->basename_offset = current_dir_name_len;
mi->clean = !!resolved;
@ -924,7 +852,6 @@ static void add_pair(struct merge_options *opt,
unsigned dir_rename_mask)
{
struct diff_filespec *one, *two;
struct mem_pool *pool = opt->priv->pool;
struct rename_info *renames = &opt->priv->renames;
int names_idx = is_add ? side : 0;
@ -975,11 +902,11 @@ static void add_pair(struct merge_options *opt,
return;
}
one = pool_alloc_filespec(pool, pathname);
two = pool_alloc_filespec(pool, pathname);
one = pool_alloc_filespec(&opt->priv->pool, pathname);
two = pool_alloc_filespec(&opt->priv->pool, pathname);
fill_filespec(is_add ? two : one,
&names[names_idx].oid, 1, names[names_idx].mode);
pool_diff_queue(pool, &renames->pairs[side], one, two);
pool_diff_queue(&opt->priv->pool, &renames->pairs[side], one, two);
}
static void collect_rename_info(struct merge_options *opt,
@ -1170,7 +1097,7 @@ static int collect_merge_info_callback(int n,
len = traverse_path_len(info, p->pathlen);
/* +1 in both of the following lines to include the NUL byte */
fullpath = pool_alloc(opt->priv->pool, len + 1);
fullpath = mem_pool_alloc(&opt->priv->pool, len + 1);
make_traverse_path(fullpath, len + 1, info, p->path, p->pathlen);
/*
@ -1425,7 +1352,7 @@ static int handle_deferred_entries(struct merge_options *opt,
copy = renames->deferred[side].possible_trivial_merges;
strintmap_init_with_options(&renames->deferred[side].possible_trivial_merges,
0,
opt->priv->pool,
&opt->priv->pool,
0);
strintmap_for_each_entry(&copy, &iter, entry) {
const char *path = entry->key;
@ -2377,21 +2304,17 @@ static void apply_directory_rename_modifications(struct merge_options *opt,
VERIFY_CI(ci);
/* Find parent directories missing from opt->priv->paths */
if (opt->priv->pool) {
cur_path = mem_pool_strdup(opt->priv->pool, new_path);
free((char*)new_path);
new_path = (char *)cur_path;
} else {
cur_path = new_path;
}
cur_path = mem_pool_strdup(&opt->priv->pool, new_path);
free((char*)new_path);
new_path = (char *)cur_path;
while (1) {
/* Find the parent directory of cur_path */
char *last_slash = strrchr(cur_path, '/');
if (last_slash) {
parent_name = pool_strndup(opt->priv->pool,
cur_path,
last_slash - cur_path);
parent_name = mem_pool_strndup(&opt->priv->pool,
cur_path,
last_slash - cur_path);
} else {
parent_name = opt->priv->toplevel_dir;
break;
@ -2400,8 +2323,6 @@ static void apply_directory_rename_modifications(struct merge_options *opt,
/* Look it up in opt->priv->paths */
entry = strmap_get_entry(&opt->priv->paths, parent_name);
if (entry) {
if (!opt->priv->pool)
free((char*)parent_name);
parent_name = entry->key; /* reuse known pointer */
break;
}
@ -2428,16 +2349,6 @@ static void apply_directory_rename_modifications(struct merge_options *opt,
parent_name = cur_dir;
}
if (!opt->priv->pool) {
/*
* We are removing old_path from opt->priv->paths.
* old_path also will eventually need to be freed, but it
* may still be used by e.g. ci->pathnames. So, store it
* in another string-list for now.
*/
string_list_append(&opt->priv->paths_to_free, old_path);
}
assert(ci->filemask == 2 || ci->filemask == 4);
assert(ci->dirmask == 0);
strmap_remove(&opt->priv->paths, old_path, 0);
@ -2471,8 +2382,6 @@ static void apply_directory_rename_modifications(struct merge_options *opt,
new_ci->stages[index].mode = ci->stages[index].mode;
oidcpy(&new_ci->stages[index].oid, &ci->stages[index].oid);
if (!opt->priv->pool)
free(ci);
ci = new_ci;
}
@ -2888,7 +2797,6 @@ static void use_cached_pairs(struct merge_options *opt,
{
struct hashmap_iter iter;
struct strmap_entry *entry;
struct mem_pool *pool = opt->priv->pool;
/*
* Add to side_pairs all entries from renames->cached_pairs[side_index].
@ -2900,30 +2808,24 @@ static void use_cached_pairs(struct merge_options *opt,
const char *new_name = entry->value;
if (!new_name)
new_name = old_name;
if (pool) {
/*
* cached_pairs has _copies* of old_name and new_name,
* because it has to persist across merges. When
* pool != NULL
* pool_alloc_filespec() will just re-use the existing
* filenames, which will also get re-used by
* opt->priv->paths if they become renames, and then
* get freed at the end of the merge, leaving the copy
* in cached_pairs dangling. Avoid this by making a
* copy here.
*
* When pool == NULL, pool_alloc_filespec() calls
* alloc_filespec(), which makes a copy; we don't want
* to add another.
*/
old_name = mem_pool_strdup(pool, old_name);
new_name = mem_pool_strdup(pool, new_name);
}
/*
* cached_pairs has *copies* of old_name and new_name,
* because it has to persist across merges. Since
* pool_alloc_filespec() will just re-use the existing
* filenames, which will also get re-used by
* opt->priv->paths if they become renames, and then
* get freed at the end of the merge, that would leave
* the copy in cached_pairs dangling. Avoid this by
* making a copy here.
*/
old_name = mem_pool_strdup(&opt->priv->pool, old_name);
new_name = mem_pool_strdup(&opt->priv->pool, new_name);
/* We don't care about oid/mode, only filenames and status */
one = pool_alloc_filespec(pool, old_name);
two = pool_alloc_filespec(pool, new_name);
pool_diff_queue(pool, pairs, one, two);
one = pool_alloc_filespec(&opt->priv->pool, old_name);
two = pool_alloc_filespec(&opt->priv->pool, new_name);
pool_diff_queue(&opt->priv->pool, pairs, one, two);
pairs->queue[pairs->nr-1]->status = entry->value ? 'R' : 'D';
}
}
@ -3031,7 +2933,7 @@ static int detect_regular_renames(struct merge_options *opt,
diff_queued_diff = renames->pairs[side_index];
trace2_region_enter("diff", "diffcore_rename", opt->repo);
diffcore_rename_extended(&diff_opts,
opt->priv->pool,
&opt->priv->pool,
&renames->relevant_sources[side_index],
&renames->dirs_removed[side_index],
&renames->dir_rename_count[side_index],
@ -3082,7 +2984,7 @@ static int collect_renames(struct merge_options *opt,
if (p->status != 'A' && p->status != 'R') {
possibly_cache_new_pair(renames, p, side_index, NULL);
pool_diff_free_filepair(opt->priv->pool, p);
pool_diff_free_filepair(&opt->priv->pool, p);
continue;
}
@ -3095,7 +2997,7 @@ static int collect_renames(struct merge_options *opt,
possibly_cache_new_pair(renames, p, side_index, new_path);
if (p->status != 'R' && !new_path) {
pool_diff_free_filepair(opt->priv->pool, p);
pool_diff_free_filepair(&opt->priv->pool, p);
continue;
}
@ -3213,7 +3115,7 @@ cleanup:
side_pairs = &renames->pairs[s];
for (i = 0; i < side_pairs->nr; ++i) {
struct diff_filepair *p = side_pairs->queue[i];
pool_diff_free_filepair(opt->priv->pool, p);
pool_diff_free_filepair(&opt->priv->pool, p);
}
}
@ -3226,7 +3128,7 @@ simple_cleanup:
if (combined.nr) {
int i;
for (i = 0; i < combined.nr; i++)
pool_diff_free_filepair(opt->priv->pool,
pool_diff_free_filepair(&opt->priv->pool,
combined.queue[i]);
free(combined.queue);
}
@ -3701,7 +3603,7 @@ static void process_entry(struct merge_options *opt,
* the directory to remain here, so we need to move this
* path to some new location.
*/
new_ci = pool_calloc(opt->priv->pool, 1, sizeof(*new_ci));
new_ci = mem_pool_calloc(&opt->priv->pool, 1, sizeof(*new_ci));
/* We don't really want new_ci->merged.result copied, but it'll
* be overwritten below so it doesn't matter. We also don't
@ -3794,7 +3696,8 @@ static void process_entry(struct merge_options *opt,
const char *a_path = NULL, *b_path = NULL;
int rename_a = 0, rename_b = 0;
new_ci = pool_alloc(opt->priv->pool, sizeof(*new_ci));
new_ci = mem_pool_alloc(&opt->priv->pool,
sizeof(*new_ci));
if (S_ISREG(a_mode))
rename_a = 1;
@ -3863,19 +3766,8 @@ static void process_entry(struct merge_options *opt,
b_path = path;
strmap_put(&opt->priv->paths, b_path, new_ci);
if (rename_a && rename_b) {
if (rename_a && rename_b)
strmap_remove(&opt->priv->paths, path, 0);
/*
* We removed path from opt->priv->paths. path
* will also eventually need to be freed if not
* part of a memory pool...but it may still be
* used by e.g. ci->pathnames. So, store it in
* another string-list for now in that case.
*/
if (!opt->priv->pool)
string_list_append(&opt->priv->paths_to_free,
path);
}
/*
* Do special handling for b_path since process_entry()
@ -4482,13 +4374,8 @@ static void merge_start(struct merge_options *opt, struct merge_result *result)
/* Initialization of various renames fields */
renames = &opt->priv->renames;
#if USE_MEMORY_POOL
mem_pool_init(&opt->priv->internal_pool, 0);
opt->priv->pool = &opt->priv->internal_pool;
#else
opt->priv->pool = NULL;
#endif
pool = opt->priv->pool;
mem_pool_init(&opt->priv->pool, 0);
pool = &opt->priv->pool;
for (i = MERGE_SIDE1; i <= MERGE_SIDE2; i++) {
strintmap_init_with_options(&renames->dirs_removed[i],
NOT_RELEVANT, pool, 0);
@ -4525,15 +4412,13 @@ static void merge_start(struct merge_options *opt, struct merge_result *result)
* Although we initialize opt->priv->paths with strdup_strings=0,
* that's just to avoid making yet another copy of an allocated
* string. Putting the entry into paths means we are taking
* ownership, so we will later free it. paths_to_free is similar.
* ownership, so we will later free it.
*
* In contrast, conflicted just has a subset of keys from paths, so
* we don't want to free those (it'd be a duplicate free).
*/
strmap_init_with_options(&opt->priv->paths, pool, 0);
strmap_init_with_options(&opt->priv->conflicted, pool, 0);
if (!opt->priv->pool)
string_list_init_nodup(&opt->priv->paths_to_free);
/*
* keys & strbufs in output will sometimes need to outlive "paths",