Reviewers: rossberg,
Message:
Hi Andreas,
I'm not sure whether this is worth submitting, but I wanted to pass it along
since I spent a bit of time Friday hacking it up. It'd be mostly superseded
by
speeding up Object.freeze() in general, but it may be worth it in the long
term
since we know exactly the layout of these objects ahead of time.
Description:
Create pre-frozen change records for Object.observe
Added a JSChangeRecord bag-of-constants to objects.h and use it to create
two
custom maps for each context in bootstrapper.cc.
This greatly increases performance (~5x) of the ChangeSummary fuzzer (which
tests creating lots of change records).
Before (ms): 4102, 4263, 4219
After (ms): 860, 871, 870
Please review this at https://codereview.chromium.org/12183018/
SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge
Affected files:
M src/bootstrapper.cc
M src/contexts.h
M src/heap.h
M src/object-observe.js
M src/objects.h
M src/objects.cc
M src/runtime.h
M src/runtime.cc
M src/v8natives.js
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