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Stop allocating backref strings within gsub's search loop

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* internal.h: add prototype for rb_reg_search0

* re.c: rename rb_reg_search to rb_reg_search0, add set_backref_str
  argument to allow callers to indicate that they don't require the
  backref string to be allocated

* string.c: don't allocate backref str if replacement string is provided

Closes GH-578. [Bug #9676] [ruby-core:61682]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45414 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
charliesome 2014-03-25 23:46:05 +00:00
parent ebd9f1d0e4
commit a77206582e
4 changed files with 32 additions and 6 deletions
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12
ChangeLog
View file

@ -1,3 +1,15 @@
Wed Mar 26 08:45:00 2014 Sam Rawlins <sam.rawlins@gmail.com>
* internal.h: add prototype for rb_reg_search0
* re.c: rename rb_reg_search to rb_reg_search0, add set_backref_str
argument to allow callers to indicate that they don't require the
backref string to be allocated.
* string.c: don't allocate backref str if replacement string is provided
[GH-578] [Bug #9676] [ruby-core:61682]
Wed Mar 26 08:29:43 2014 mo khan <mo@mokhan.ca>
* lib/rubygem.rb: fix spelling of Jim Weirich. [Fixes GH-577]

3
internal.h
View file

@ -978,6 +978,9 @@ VALUE rb_gcd_normal(VALUE self, VALUE other);
VALUE rb_gcd_gmp(VALUE x, VALUE y);
#endif
/* re.c */
long rb_reg_search0(VALUE, VALUE, long, int, int);
/* util.c */
extern const signed char ruby_digit36_to_number_table[];

15
re.c
View file

@ -1375,7 +1375,7 @@ rb_reg_adjust_startpos(VALUE re, VALUE str, long pos, int reverse)
/* returns byte offset */
long
rb_reg_search(VALUE re, VALUE str, long pos, int reverse)
rb_reg_search0(VALUE re, VALUE str, long pos, int reverse, int set_backref_str)
{
long result;
VALUE match;
@ -1450,17 +1450,26 @@ rb_reg_search(VALUE re, VALUE str, long pos, int reverse)
FL_UNSET(match, FL_TAINT);
}
RMATCH(match)->str = rb_str_new4(str);
if (set_backref_str) {
RMATCH(match)->str = rb_str_new4(str);
OBJ_INFECT(match, str);
}
RMATCH(match)->regexp = re;
RMATCH(match)->rmatch->char_offset_updated = 0;
rb_backref_set(match);
OBJ_INFECT(match, re);
OBJ_INFECT(match, str);
return result;
}
long
rb_reg_search(VALUE re, VALUE str, long pos, int reverse)
{
return rb_reg_search0(re, str, pos, reverse, 1);
}
VALUE
rb_reg_nth_defined(int nth, VALUE match)
{

8
string.c
View file

@ -4021,6 +4021,7 @@ str_gsub(int argc, VALUE *argv, VALUE str, int bang)
int iter = 0;
char *sp, *cp;
int tainted = 0;
int str_replace;
rb_encoding *str_enc;
switch (argc) {
@ -4041,7 +4042,8 @@ str_gsub(int argc, VALUE *argv, VALUE str, int bang)
}
pat = get_pat(argv[0], 1);
beg = rb_reg_search(pat, str, 0, 0);
str_replace = !iter && NIL_P(hash);
beg = rb_reg_search0(pat, str, 0, 0, !str_replace);
if (beg < 0) {
if (bang) return Qnil; /* no match, no substitution */
return rb_str_dup(str);
@ -4064,7 +4066,7 @@ str_gsub(int argc, VALUE *argv, VALUE str, int bang)
regs = RMATCH_REGS(match);
beg0 = BEG(0);
end0 = END(0);
if (iter || !NIL_P(hash)) {
if (!str_replace) {
if (iter) {
val = rb_obj_as_string(rb_yield(rb_reg_nth_match(0, match)));
}
@ -4104,7 +4106,7 @@ str_gsub(int argc, VALUE *argv, VALUE str, int bang)
}
cp = RSTRING_PTR(str) + offset;
if (offset > RSTRING_LEN(str)) break;
beg = rb_reg_search(pat, str, offset, 0);
beg = rb_reg_search0(pat, str, offset, 0, !str_replace);
} while (beg >= 0);
if (RSTRING_LEN(str) > offset) {
rb_enc_str_buf_cat(dest, cp, RSTRING_LEN(str) - offset, str_enc);