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add rb_hash_new_with_size()

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Sometimes, size of a hash can be calcluated a priori.  By providing
such info to the constructor we can avoid unnecessary internal re-
allocations.  This can boost for instance creation of hash literals.
[Bug #13861]

Signed-off-by: Urabe, Shyouhei <shyouhei@ruby-lang.org>


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59744 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
shyouhei 2017-09-05 04:48:19 +00:00
parent e568455826
commit 0eb7359cc7
4 changed files with 13 additions and 3 deletions
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11
hash.c
View file

@ -432,6 +432,15 @@ rb_hash_new(void)
return hash_alloc(rb_cHash);
}
VALUE
rb_hash_new_with_size(st_index_t size)
{
VALUE ret = rb_hash_new();
if (size)
RHASH(ret)->ntbl = st_init_table_with_size(&objhash, size);
return ret;
}
static VALUE
hash_dup(VALUE hash, VALUE klass, VALUE flags)
{
@ -1927,7 +1936,7 @@ rb_hash_transform_values(VALUE hash)
VALUE result;
RETURN_SIZED_ENUMERATOR(hash, 0, 0, hash_enum_size);
result = rb_hash_new();
result = rb_hash_new_with_size(RHASH_SIZE(hash));
if (!RHASH_EMPTY_P(hash)) {
rb_hash_foreach(hash, transform_values_i, result);
}

2
insns.def
View file

@ -496,7 +496,7 @@ newhash
{
RUBY_DTRACE_CREATE_HOOK(HASH, num);
val = rb_hash_new();
val = rb_hash_new_with_size(num / 2);
if (num) {
rb_hash_bulk_insert(num, STACK_ADDR_FROM_TOP(num), val);

1
internal.h
View file

@ -1242,6 +1242,7 @@ void ruby_sized_xfree(void *x, size_t size);
/* hash.c */
struct st_table *rb_hash_tbl_raw(VALUE hash);
VALUE rb_hash_new_with_size(st_index_t size);
VALUE rb_hash_has_key(VALUE hash, VALUE key);
VALUE rb_hash_default_value(VALUE hash, VALUE key);
VALUE rb_hash_set_default_proc(VALUE hash, VALUE proc);

2
vm.c
View file

@ -2694,7 +2694,7 @@ m_core_hash_from_ary(VALUE self, VALUE ary)
static VALUE
core_hash_from_ary(VALUE ary)
{
VALUE hash = rb_hash_new();
VALUE hash = rb_hash_new_with_size(RARRAY_LEN(ary) / 2);
RUBY_DTRACE_CREATE_HOOK(HASH, (Check_Type(ary, T_ARRAY), RARRAY_LEN(ary)));
return core_hash_merge_ary(hash, ary);