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Benedikt Meurer 96b1fdb276 [ic] Internalize strings on the fly in KeyedLoadICGeneric. 
This turns on the existing --internalize_on_the_fly flag for the
MEGAMORPHIC KeyedLoadIC to properly internalize strings before
looking up the property. This avoids the otherwise taken runtime
call to %KeyedGetProperty, which is definitely slower.

Initially the --internalize_on_the_fly flag was turned off because
internalizing strings on the fly causes too much traffic on the
megamorphic stub cache. We avoid this problem here by not probing
the stub cache in that case, which still gives the benefit of not
having to go to the runtime.

This improves the babylon test on the web-tooling-benchmark by around
2-3% and will probably also help with several tests (like React or
Ember) on the Speedometer benchmark.

If this CL causes trouble (i.e. tanks something important), we can
just turn off the --internalize_on_the_fly flag again.

Bug: v8:6936, v8:7026
Change-Id: If295ed3fd013f8b0ff031f9979e7df21dab817b6
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/751464
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49093}
2017-11-02 20:57:10 +00:00
benchmarks Fix common misspellings 2017-08-02 09:35:28 +00:00
build_overrides Remove build_override for macOS min SDK and deployment target. 2017-07-14 18:24:44 +00:00
docs [Docs] Removed unused docs because they are moved to GitHub 2015-11-19 10:23:30 +00:00
gni [test] Fix isolate for auto-detect in gyp 2017-10-19 11:52:11 +00:00
gypfiles Reland "[heap] Temporarily disable concurrent marking." 2017-11-02 19:10:00 +00:00
include [compiler] Split compilation timer on caching decision 2017-11-01 17:10:45 +00:00
infra [CQ] Use non-luci fuchsia bots for cq experiment 2017-10-30 12:45:10 +00:00
samples [presubmit] Enable and fix "build/namespaces" linter check. 2017-09-04 11:24:26 +00:00
src [ic] Internalize strings on the fly in KeyedLoadICGeneric. 2017-11-02 20:57:10 +00:00
test [ic] Internalize strings on the fly in KeyedLoadICGeneric. 2017-11-02 20:57:10 +00:00
testing Use GTEST_LANG_CXX11 in V8 2016-07-25 13:06:42 +00:00
third_party Add colorama package to DEPS so that pylib can import it 2017-10-24 14:18:49 +00:00
tools Deprecated shell dir option. 2017-11-02 19:03:15 +00:00
.clang-format [clang-format] Don't derive pointer alignment 2017-01-17 09:28:19 +00:00
.editorconfig Add .editorconfig 2017-07-28 13:39:24 +00:00
.git-blame-ignore-revs [build] Add DEPS formatting to hyper-blame 2017-10-09 14:08:45 +00:00
.gitignore Add colorama package to DEPS so that pylib can import it 2017-10-24 14:18:49 +00:00
.gn For building v8 using gn on aix_ppc64, linux_s390x and linux_ppc64(both LE and BE). 2017-05-12 01:35:09 +00:00
.vpython Add a comment for the VPython dep 2017-10-25 12:23:35 +00:00
.ycm_extra_conf.py Use C++11 / gnu++11, not 0x 2016-03-22 15:24:43 +00:00
AUTHORS [modules] Optimize import.meta in the interpreter 2017-10-20 20:31:49 +00:00
BUILD.gn Reland "[heap] Temporarily disable concurrent marking." 2017-11-02 19:10:00 +00:00
ChangeLog [Release] Update ChangeLog file 2016-02-17 21:29:09 +00:00
CODE_OF_CONDUCT.md Explicitly state that the Chromium Code of Conduct also applies to V8 2016-03-02 09:51:24 +00:00
codereview.settings Make Gerrit the default code review for V8 2017-06-30 17:37:37 +00:00
DEPS Update V8 DEPS. 2017-11-01 03:55:44 +00:00
LICENSE Updates to the license information of third party components. 2015-06-16 12:37:50 +00:00
LICENSE.fdlibm Add LICENSE.fdlibm for all the fdlibm imported sources. 2016-06-09 07:17:03 +00:00
LICENSE.strongtalk Add LICENSE.v8, LICENSE.strongtalk and LICENSE.valgrind to the v8 2011-02-03 07:10:06 +00:00
LICENSE.v8 Add LICENSE.v8, LICENSE.strongtalk and LICENSE.valgrind to the v8 2011-02-03 07:10:06 +00:00
LICENSE.valgrind Add LICENSE.v8, LICENSE.strongtalk and LICENSE.valgrind to the v8 2011-02-03 07:10:06 +00:00
Makefile [test] Continued test support for make targets 2017-10-20 15:01:51 +00:00
Makefile.android [build] Fix d8-for-Android builds 2016-05-20 12:10:45 +00:00
OWNERS Add eholk and gdeepti to toplevel owners 2017-08-12 07:07:29 +00:00
PRESUBMIT.py [iwyu] Turn inclusion presubmit warning into and error. 2017-09-14 10:17:58 +00:00
README.md [Docs] Removed unused docs because they are moved to GitHub 2015-11-19 10:23:30 +00:00
snapshot_toolchain.gni MIPS[64]: Add support for big endian build using GN 2017-06-02 15:02:18 +00:00
WATCHLISTS [V8Tracing] Add lpy@ and fmeawad@ into watchlist for tracing/. 2017-05-22 19:40:17 +00:00

README.md

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.