The cache is a hashtable that takes String as key and JSFunction as the value.

Caches are cleared before mark-compact GC's.

Currently I don't put caps on cache size, string size, etc.

This cuts date-parse-totfe.js runtime by half.


Review URL: http://codereview.chromium.org/457

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@173 ce2b1a6d-e550-0410-aec6-3dcde31c8c00