2f6be682ac
Reporting use counts by invoking a callback once per occurrence has a large overhead cost in certain situations, for example when it needs to be dispatched to a different thread (which is the case for Web Workers). Parsing large scripts can produce a lot of occurrences (strict/sloppy mode once per function). Chromium (the only known user of UseCounters so far) does not actually care about number of occurrences, but simply whether they happened at least once. This commit changes behavior to report features at most once, which dramatically improves performance for impacted use cases, and should not affect the only known real world usage. R=littledan@chromium.org BUG=chromium:614775 Review-Url: https://codereview.chromium.org/2062203002 Cr-Commit-Position: refs/heads/master@{#36979} |
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benchmarks | ||
build_overrides | ||
docs | ||
gni | ||
gypfiles | ||
include | ||
infra | ||
samples | ||
src | ||
test | ||
testing | ||
third_party/binutils | ||
tools | ||
.clang-format | ||
.gitignore | ||
.gn | ||
.ycm_extra_conf.py | ||
AUTHORS | ||
BUILD.gn | ||
ChangeLog | ||
CODE_OF_CONDUCT.md | ||
codereview.settings | ||
DEPS | ||
LICENSE | ||
LICENSE.fdlibm | ||
LICENSE.strongtalk | ||
LICENSE.v8 | ||
LICENSE.valgrind | ||
Makefile | ||
Makefile.android | ||
Makefile.nacl | ||
OWNERS | ||
PRESUBMIT.py | ||
README.md | ||
snapshot_toolchain.gni | ||
WATCHLISTS |
V8 JavaScript Engine
V8 is Google's open source JavaScript engine.
V8 implements ECMAScript as specified in ECMA-262.
V8 is written in C++ and is used in Google Chrome, the open source browser from Google.
V8 can run standalone, or can be embedded into any C++ application.
V8 Project page: https://github.com/v8/v8/wiki
Getting the Code
Checkout depot tools, and run
fetch v8
This will checkout V8 into the directory v8
and fetch all of its dependencies.
To stay up to date, run
git pull origin
gclient sync
For fetching all branches, add the following into your remote
configuration in .git/config
:
fetch = +refs/branch-heads/*:refs/remotes/branch-heads/*
fetch = +refs/tags/*:refs/tags/*
Contributing
Please follow the instructions mentioned on the V8 wiki.