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Benedikt Meurer f310c28bba [turbofan] Make backing store load eliminatable for %ArrayIteratorPrototype%.next(). 
Place the LoadField for the backing store of the [[IteratedObject]]
before the diamond to make it possible to eliminate this LoadField
in LoadElimination later, when used in `for..of` or destructing.

This further improves the performance of `for..of` in the micro
benchmark on the tracking bug from

  console.timeEnd: forOf, 191.726000
  console.timeEnd: traditional, 107.572000
  console.timeEnd: forOf, 137.288000
  console.timeEnd: traditional, 102.976000
  console.timeEnd: forOf, 137.506000
  console.timeEnd: traditional, 103.089000

to around

  console.timeEnd: forOf, 195.238000
  console.timeEnd: traditional, 107.078000
  console.timeEnd: forOf, 128.980000
  console.timeEnd: traditional, 103.106000
  console.timeEnd: forOf, 128.525000
  console.timeEnd: traditional, 103.072000

so roughly another ~7% improvement (with untrusted code mitigations
turned off).

Bug: v8:8070
Change-Id: I34831c503384f0cc44b95317dd84403f2ed8ecd5
Reviewed-on: https://chromium-review.googlesource.com/1188138
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55390}
2018-08-24 10:38:23 +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 [api] Counters for WASM shared memory and threads opcodes 2018-08-23 14:30:40 +00:00
infra cq: remove no longer necessary cq_name. 2018-08-15 21:00:06 +00:00
samples Add a sample that uses the JS API to create wasm 2018-06-07 23:43:38 +00:00
src [turbofan] Make backing store load eliminatable for %ArrayIteratorPrototype%.next(). 2018-08-24 10:38:23 +00:00
test [heap-profiler] Location for object's constructor 2018-08-24 10:01:48 +00:00
testing Remove dummy files created for rolling googletest. 2018-03-27 05:55:56 +00:00
third_party [array] Replace JS Array.p.reverse with a Torque implementation 2018-08-24 05:57:20 +00:00
tools [interpreter][runtime] Avoid AllocationSites for Array literals in oneshot code 2018-08-23 12:00:43 +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 [array] Move Array.p.sort to Torque and use TimSort instead of QuickSort 2018-08-09 08:45:39 +00:00
.gn [test] Remove obsolete test262 archive extract 2018-03-28 13:52:15 +00:00
.vpython [tools] Add VPython config for callstats.py 2018-08-14 10:15:46 +00:00
.ycm_extra_conf.py [ycm] Switch from gnu++11 to gnu++14 2017-11-27 07:48:21 +00:00
AUTHORS MIPS: Fix DCHECK failure in v8::internal::Assembler::seb() 2018-08-06 20:35:08 +00:00
BUILD.gn [array] Replace JS Array.p.reverse with a Torque implementation 2018-08-24 05:57:20 +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 [wasm] Update spec tests 2018-08-22 09:34:31 +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.