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string.c: optimize rb_str_resurrect

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* string.c (rb_str_resurrect): optimize by short circuit to copy
  hidden string without checking length, encoding and so on.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52048 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2015-10-05 17:29:40 +00:00
parent 355a0d8af1
commit 237332fcea
2 changed files with 25 additions and 1 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
Tue Oct 6 02:29:38 2015 Nobuyoshi Nakada <nobu@ruby-lang.org>
* string.c (rb_str_resurrect): optimize by short circuit to copy
hidden string without checking length, encoding and so on.
Mon Oct 5 23:08:17 2015 CHIKANAGA Tomoyuki <nagachika@ruby-lang.org>
* test/ruby/test_thread.rb (test_handle_interrupt_blocking): check if

21
string.c
View file

@ -1250,11 +1250,30 @@ rb_str_dup(VALUE str)
VALUE
rb_str_resurrect(VALUE str)
{
VALUE dup;
VALUE flags = FL_TEST_RAW(str,
RSTRING_NOEMBED |
RSTRING_EMBED_LEN_MASK |
ENC_CODERANGE_MASK |
ENCODING_MASK |
FL_TAINT | FL_FREEZE);
if (RUBY_DTRACE_STRING_CREATE_ENABLED()) {
RUBY_DTRACE_STRING_CREATE(RSTRING_LEN(str),
rb_sourcefile(), rb_sourceline());
}
return str_duplicate(rb_cString, str);
dup = str_alloc(rb_cString);
MEMCPY(RSTRING(dup)->as.ary, RSTRING(str)->as.ary, VALUE, 3);
if (flags & STR_NOEMBED) {
if (UNLIKELY(!(flags & FL_FREEZE))) {
str = str_new_frozen(rb_cString, str);
FL_SET_RAW(str, flags & FL_TAINT);
}
RB_OBJ_WRITE(dup, &RSTRING(dup)->as.heap.aux.shared, str);
flags |= STR_SHARED;
}
FL_SET_RAW(dup, flags & ~FL_FREEZE);
return dup;
}
/*