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Deepti Gandluri 43098ecbe8 Revert "[CloneObjectIC] overwrite monomorphic/polymorphic feedback if deprecated" 
This reverts commit 670fa86fd1.

Reason for revert: Causes gc-stress bots to fail - 
https://logs.chromium.org/logs/v8/buildbucket/cr-buildbucket.appspot.com/8939819990688690880/+/steps/Check_-_d8/0/logs/object-spread-ic/0
https://logs.chromium.org/logs/v8/buildbucket/cr-buildbucket.appspot.com/8939819696982258192/+/steps/Check_-_d8/0/logs/object-spread-ic/0

Original change's description:
> [CloneObjectIC] overwrite monomorphic/polymorphic feedback if deprecated
> 
> An object with a deprecated Map which has already been cached in
> CloneObjectIC feedback is still a valid Map for fast cloning --- but
> to be consistent with other ICs, deprecated maps are ignored, and are
> expected to be transitioned away from.
> 
> If the source object has a deprecated map, the instance is migrated.
> 
> BUG=v8:7611, chromium:867958
> R=​jkummerow@chromium.org, mvstanton@chromium.org
> 
> Change-Id: I9771b00400fb4dda45a62e874a31d9b50630d847
> Reviewed-on: https://chromium-review.googlesource.com/1152414
> Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
> Commit-Queue: Caitlin Potter <caitp@igalia.com>
> Cr-Commit-Position: refs/heads/master@{#54758}

TBR=jkummerow@chromium.org,mvstanton@chromium.org,caitp@igalia.com

Change-Id: Id17652ad6f3f09adb43848069549ad146d48b2d7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7611, chromium:867958
Reviewed-on: https://chromium-review.googlesource.com/1153747
Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54760}
2018-07-27 21:39:00 +00:00
benchmarks Fix common misspellings 2017-08-02 09:35:28 +00:00
build_overrides [ndk] Change android ndk root for v8 2018-01-11 08:10:33 +00:00
custom_deps [build] Add common directory for custom deps 2018-06-08 19:23:02 +00:00
docs [Docs] Removed unused docs because they are moved to GitHub 2015-11-19 10:23:30 +00:00
gni Disable multi_snapshots by default 2018-06-28 10:02:12 +00:00
include Reland^2 "Avoiding re-externalization of strings" 2018-07-25 18:54:28 +00:00
infra [test] Add isolates testing to CQ 2018-07-27 10:15:00 +00:00
samples Add a sample that uses the JS API to create wasm 2018-06-07 23:43:38 +00:00
src Revert "[CloneObjectIC] overwrite monomorphic/polymorphic feedback if deprecated" 2018-07-27 21:39:00 +00:00
test Revert "[CloneObjectIC] overwrite monomorphic/polymorphic feedback if deprecated" 2018-07-27 21:39:00 +00:00
testing Remove dummy files created for rolling googletest. 2018-03-27 05:55:56 +00:00
third_party [third_party] remove antlr 2018-07-20 11:31:06 +00:00
tools Revert "[tools] Add an option to checkout v8-perf repo before running perf tests" 2018-07-27 21:28:58 +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
.gitattributes Disable line ending modifications by git in .png files 2018-06-27 15:39:07 +00:00
.gitignore [iwyu] Add script to check that headers can be included in isolation 2018-07-20 13:54:59 +00:00
.gn [test] Remove obsolete test262 archive extract 2018-03-28 13:52:15 +00:00
.vpython [tools] Add pypiwin32 pacakge to VPython config 2018-03-09 20:33:36 +00:00
.ycm_extra_conf.py [ycm] Switch from gnu++11 to gnu++14 2017-11-27 07:48:21 +00:00
AUTHORS Update MIPS file ownership to @wavecomp.com e-mail addresses 2018-07-26 16:28:10 +00:00
BUILD.gn [iwyu] Untangle heap/local-allocator(-inl).h 2018-07-27 10:44:30 +00:00
ChangeLog [tools] Merge ChangeLog from latest release 2017-12-19 12:30:56 +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. 2018-07-27 03:52:53 +00:00
LICENSE Add antlr4 runtime library to support Torque 2018-04-10 10:01:01 +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
OWNERS Update OWNERS files. 2018-07-17 07:56:16 +00:00
PRESUBMIT.py Add autoroller task account into bot whitelist for author check 2018-06-06 14:40:09 +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]: Generate snapshots on MIPS big-endian targets 2017-11-24 19:00:32 +00:00
WATCHLISTS Remove v8-x87-ports@ from WATCHLIST 2018-02-26 19:56:21 +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.