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* regcomp.c (setup_tree, onig_compile): optimize .* at last by

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converting into (?>.*), which does not backtrack.  [ruby-core:27791]

* test/ruby/test_regexp.rb: add a test for above.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@26701 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
mame 2010-02-17 12:36:41 +00:00
parent 24421c835d
commit 457c2c4a55
3 changed files with 32 additions and 2 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
Wed Feb 17 21:34:01 2010 Yusuke Endoh <mame@tsg.ne.jp>
* regcomp.c (setup_tree, onig_compile): optimize .* at last by
converting into (?>.*), which does not backtrack. [ruby-core:27791]
* test/ruby/test_regexp.rb: add a test for above.
Wed Feb 17 21:26:53 2010 Tanaka Akira <akr@fsij.org>
* bootstraptest/runner.rb (assert_normal_exit): add :timeout option.

20
regcomp.c
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@ -3643,6 +3643,7 @@ setup_comb_exp_check(Node* node, int state, ScanEnv* env)
#define IN_NOT (1<<1)
#define IN_REPEAT (1<<2)
#define IN_VAR_REPEAT (1<<3)
#define IN_LAST (1<<4)
/* setup_tree does the following work.
1. check empty loop. (set qn->target_empty_info)
@ -3664,7 +3665,8 @@ setup_tree(Node* node, regex_t* reg, int state, ScanEnv* env)
{
Node* prev = NULL_NODE;
do {
r = setup_tree(NCAR(node), reg, state, env);
int s = IS_NOT_NULL(NCDR(node)) ? (state & ~IN_LAST) : state;
r = setup_tree(NCAR(node), reg, s, env);
if (IS_NOT_NULL(prev) && r == 0) {
r = next_setup(prev, NCAR(node), reg);
}
@ -3795,6 +3797,20 @@ setup_tree(Node* node, regex_t* reg, int state, ScanEnv* env)
}
}
#endif
if ((state & IN_LAST) != 0 && qn->greedy && IS_REPEAT_INFINITE(qn->upper)) {
/* automatic posseivation a* (at last) ==> (?>a*) */
if (qn->lower <= 1) {
int ttype = NTYPE(qn->target);
if (IS_NODE_TYPE_SIMPLE(ttype)) {
Node* en = onig_node_new_enclose(ENCLOSE_STOP_BACKTRACK);
CHECK_NULL_RETURN_MEMERR(en);
SET_ENCLOSE_STATUS(en, NST_STOP_BT_SIMPLE_REPEAT);
swap_node(node, en);
NENCLOSE(node)->target = en;
}
}
}
}
break;
@ -5423,7 +5439,7 @@ onig_compile(regex_t* reg, const UChar* pattern, const UChar* pattern_end,
reg->num_call = 0;
#endif
r = setup_tree(root, reg, 0, &scan_env);
r = setup_tree(root, reg, IN_LAST, &scan_env);
if (r != 0) goto err_unset;
#ifdef ONIG_DEBUG_PARSE_TREE

7
test/ruby/test_regexp.rb
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@ -800,4 +800,11 @@ class TestRegexp < Test::Unit::TestCase
assert_nothing_raised { eval("a = 1; /\#{ a }/; a") }
assert_nothing_raised { eval("a = 1; /\#{ a }/o; a") }
end
def test_optimize_last_anycharstar
s = "1" + " " * 5000000
assert_nothing_raised { s.match(/(\d) (.*)/) }
assert_equal("1", $1)
assert_equal(" " * 4999999, $2)
end
end