Reviewers: rossberg,
Message:
The upside here is that looking up the observers for an object no longer
requires a hash lookup. The downside is that observed objects now have a
different map than non-observed ones. I'm interested in hearing what y'all
think
about this tradeoff.
Description:
Use Symbols instead of WeakMaps to store data on observers and observed
objects
This breaks support for Proxies, as they do not currently support symbols.
Please review this at https://codereview.chromium.org/12433016/
SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge
Affected files:
M src/flag-definitions.h
M src/object-observe.js
M src/objects.cc
M src/runtime.h
M src/runtime.cc
M test/cctest/test-object-observe.cc
M test/mjsunit/harmony/object-observe.js
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