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util/set: add _mesa_set_copy, a cloning helper without allocation

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Reviewed-by: Gert Wollny <gert.wollny@collabora.com>
Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36728>
This commit is contained in:
Marek Olšák 2025-08-11 02:27:34 -04:00 • committed by Marge Bot
parent ed246aafd8
commit 06cef7bcc2
2 changed files with 29 additions and 15 deletions
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41
src/util/set.c
View file

@ -203,6 +203,29 @@ _mesa_set_create_u32_keys(void *mem_ctx)
return _mesa_set_create(mem_ctx, key_u32_hash, key_u32_equals);
}
/* Copy the set from src to dst. */
bool
_mesa_set_copy(struct set *dst, struct set *src, void *dst_mem_ctx)
{
/* Copy the structure except the initial storage. */
memcpy(dst, src, offsetof(struct set, _initial_storage));
dst->mem_ctx = dst_mem_ctx;
if (src->table != src->_initial_storage) {
dst->table = ralloc_array(dst_mem_ctx, struct set_entry, dst->size);
if (dst->table == NULL)
return false;
memcpy(dst->table, src->table, dst->size * sizeof(struct set_entry));
} else {
dst->table = dst->_initial_storage;
memcpy(dst->table, src->_initial_storage, sizeof(src->_initial_storage));
}
return true;
}
/* It's preferred to use _mesa_set_copy instead of this to skip ralloc. */
struct set *
_mesa_set_clone(struct set *set, void *dst_mem_ctx)
{
@ -212,21 +235,9 @@ _mesa_set_clone(struct set *set, void *dst_mem_ctx)
if (clone == NULL)
return NULL;
/* Copy the whole structure except the initial storage. */
memcpy(clone, set, offsetof(struct set, _initial_storage));
clone->mem_ctx = dst_mem_ctx;
if (set->table != set->_initial_storage) {
clone->table = ralloc_array(dst_mem_ctx, struct set_entry, clone->size);
if (clone->table == NULL) {
ralloc_free(clone);
return NULL;
}
memcpy(clone->table, set->table, clone->size * sizeof(struct set_entry));
} else {
clone->table = clone->_initial_storage;
memcpy(clone->table, set->_initial_storage, sizeof(set->_initial_storage));
if (!_mesa_set_copy(clone, set, dst_mem_ctx)) {
ralloc_free(clone);
return NULL;
}
return clone;

3
src/util/set.h
View file

@ -88,6 +88,9 @@ _mesa_set_create(void *mem_ctx,
struct set *
_mesa_set_create_u32_keys(void *mem_ctx);
bool
_mesa_set_copy(struct set *dst, struct set *src, void *dst_mem_ctx);
struct set *
_mesa_set_clone(struct set *set, void *dst_mem_ctx);