v8/test
erikcorry f14b93a508 Regexp: Improve the speed that we scan for an initial point where a non-anchored
regexp can match by using a Boyer-Moore-like table.  This is done by identifying
non-greedy non-capturing loops in the nodes that eat any character one at a time.
For example in the middle of the regexp /foo[\s\S]*?bar/ we find such a loop.
There is also such a loop implicitly inserted at the start of any non-anchored
regexp.

When we have found such a loop we look ahead in the nodes to find the set of
characters that can come at given distances.  For example for the regexp
/.?foo/ we know that there are at least 3 characters ahead of us, and the sets
of characters that can occur are [any, [f, o], [o]].  We find a range in the
lookahead info where the set of characters is reasonably constrained.  In our
example this is from index 1 to 2 (0 is not constrained).  We can now look 3
characters ahead and if we don't find one of [f, o] (the union of [f, o] and
[o]) then we can skip forwards by the range size (in this case 2).

For Unicode input strings we do the same, but modulo 128.

We also look at the first string fed to the regexp and use that to get a hint
of the character frequencies in the inputs.  This affects the assessment of
whether the set of characters is 'reasonably constrained'.

We still have the old lookahead mechanism, which uses a wide load of multiple
characters followed by a mask and compare to determine whether a match is
possible at this point.
Review URL: http://codereview.chromium.org/9965010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11204 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2012-04-02 09:38:07 +00:00
..
benchmarks Switch from sample shell to d8 for unit test 2011-07-26 05:56:45 +00:00
cctest Regexp: Improve the speed that we scan for an initial point where a non-anchored 2012-04-02 09:38:07 +00:00
es5conform MIPS: updated test .status files based mostly on the ARM version. 2011-12-05 11:44:17 +00:00
message MIPS: updated test .status files based mostly on the ARM version. 2011-12-05 11:44:17 +00:00
mjsunit Fix hidden properties to ignore [[Extensible]]. 2012-04-02 08:26:30 +00:00
mozilla Temporarily allow timeout for one mozilla test. 2012-03-21 14:19:17 +00:00
preparser MIPS: updated test .status files based mostly on the ARM version. 2011-12-05 11:44:17 +00:00
sputnik Fix RegExp white-space character class to match BOMs. 2012-02-20 17:50:53 +00:00
test262 Fix test harness for Test262 to not use symlinks. 2012-03-28 09:33:19 +00:00