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mvstanton 3cfcc7e111 Avoid creating weak cells for literal arrays that are empty of literals. 
It may be that we have a feedback vector, but no literals. In this case
we can store into the OptimizedCodeMap directly instead of using a WeakCell,
because all data in the feedback vector is already held weakly.

The use of a WeakCell in the OptimizedCodeMap is only required when
there are literals which may hold maps strongly.

This is to address a performance regression caused by the creation of
a large number of WeakCells.

BUG=chromium:615831

Review-Url: https://codereview.chromium.org/2031123003
Cr-Commit-Position: refs/heads/master@{#36786}
2016-06-07 12:03:56 +00:00
benchmarks Revert "Refactoring: Make gtest testsuite the default." 2014-09-02 09:17:26 +00:00
build_overrides [gn] Add extra library files in stand-alone mode. 2016-06-07 08:57:44 +00:00
docs [Docs] Removed unused docs because they are moved to GitHub 2015-11-19 10:23:30 +00:00
gni [gn] Fix gyp/gn translation of use_snapshot 2016-06-07 08:02:47 +00:00
gypfiles [build] Landmine after ndk update. 2016-06-07 06:41:35 +00:00
include Introduce api for incremental wrapper tracing 2016-06-06 16:33:59 +00:00
infra [CQ] Raise blink trybot percentage to 100 2016-04-29 09:05:06 +00:00
samples Rename shell to v8_shell 2016-05-10 12:32:25 +00:00
src Avoid creating weak cells for literal arrays that are empty of literals. 2016-06-07 12:03:56 +00:00
test [json] check and handle interrupts. 2016-06-07 11:44:42 +00:00
testing Converted V8 CQ config to proto-format 2015-05-28 15:02:53 +00:00
third_party/binutils [gn] Move build to gypfiles 2016-04-29 10:11:11 +00:00
tools [gn] Fix gn targets for tools 2016-06-06 14:25:30 +00:00
.clang-format [formatting] Remove the formatting requirement for 2 empty lines between declarations. 2016-01-25 09:50:17 +00:00
.gitignore Add v8.ignition_dispatches_table.json to .gitignore 2016-05-03 18:12:11 +00:00
.gn [gn] Port exec_script whitelist from chromium/src/build 2016-06-07 07:49:12 +00:00
.ycm_extra_conf.py Use C++11 / gnu++11, not 0x 2016-03-22 15:24:43 +00:00
AUTHORS tools: Fix a syntax error in plot-timer-events 2016-05-23 10:19:47 +00:00
BUILD.gn Make api-arguments.h not include inline headers. 2016-06-07 09:50:05 +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 Use v8-reviews@ for review mail, so v8-dev@ is free for dev discussions 2015-09-09 08:14:11 +00:00
DEPS Update V8 DEPS. 2016-06-07 03:26:39 +00:00
LICENSE Updates to the license information of third party components. 2015-06-16 12:37:50 +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 [build] Fix Makefile based (native) build. 2016-05-23 09:16:24 +00:00
Makefile.android [build] Fix d8-for-Android builds 2016-05-20 12:10:45 +00:00
Makefile.nacl [gn] Move build to gypfiles 2016-04-29 10:11:11 +00:00
OWNERS [owners] adding more toplevel owners (but mainly me) 2016-03-16 15:54:42 +00:00
PRESUBMIT.py Remove LOG line checking from presubmit 2016-05-10 17:21:56 +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 Try to reland v8_snapshot GN build changes, take #3 2016-05-20 07:00:09 +00:00
WATCHLISTS [GN] Watchlist upadate to track gyp changes. 2016-05-17 08:14:26 +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.