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Benedikt Meurer 317fad950e [ic] Support negative indices for typed array OOB accesses. 
Extend the current OOB support for typed arrays to also handle the
negative integer indices in the fast-path. This is safe because in
ECMAScript we never look up integer indexed properties (including
negative indices) on typed arrays in the prototype chain.

This reduces the performance cliff shown in the benchmark on the
relevant bug from

  console.timeEnd: Runtime deopt, 596.185000
  console.timeEnd: Runtime deopt, 1444.289000
  console.timeEnd: Runtime deopt, 1445.191000
  console.timeEnd: Runtime deopt, 1443.008000

to

  console.timeEnd: Runtime deopt, 590.017000
  console.timeEnd: Runtime deopt, 784.899000
  console.timeEnd: Runtime deopt, 792.428000
  console.timeEnd: Runtime deopt, 786.740000

which corresponds to a 2x improvement overall. It's not for free,
especially not in this benchmark, but the cliff isn't as bad as
it was previously.

Bug: v8:7027
Change-Id: Icf8a7ee87bb7ebc54f82c1b9166fc5e78c12bc0e
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/911574
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51222}
2018-02-09 20:05:37 +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
docs [Docs] Removed unused docs because they are moved to GitHub 2015-11-19 10:23:30 +00:00
gni [GN][MIPS] Add ldso_path and gcc_target_rpath config on MIPS 2018-01-30 11:51:24 +00:00
include [wasm][streaming] Change the signature of the Abort API function to MaybeLocal 2018-02-09 14:47:49 +00:00
infra [build] Remove remaining gyp builders from MB configs 2018-02-08 14:25:52 +00:00
samples [gyp] move gyp files from src to gypfiles. 2018-01-23 09:54:36 +00:00
src [ic] Support negative indices for typed array OOB accesses. 2018-02-09 20:05:37 +00:00
test [simulator] Refactor simulator I-cache to be process-wide. 2018-02-09 18:25:06 +00:00
testing [gyp] move build targets for tests to gypfiles. 2018-01-30 06:31:00 +00:00
third_party Move detect_v8_host_arch out of gypfiles. 2018-01-31 08:21:01 +00:00
tools Whitespace CL 2018-02-09 18:33:26 +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 [gyp] remove gyp files. 2018-02-08 20:04:06 +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 [ycm] Switch from gnu++11 to gnu++14 2017-11-27 07:48:21 +00:00
AUTHORS Reland: Reimplement Object.entries/values as CSA to optimize performance. 2018-02-08 10:12:32 +00:00
BUILD.gn Fixes to V8 GN build process on AIX 2018-02-08 17:51:44 +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 [deps] fix hooks for node. 2018-02-09 10:42:47 +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
OWNERS Update top-level OWNERS. 2018-01-19 08:37:12 +00:00
PRESUBMIT.py [gyp] remove gyp files. 2018-02-08 20:04:06 +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 [gyp] remove gyp files. 2018-02-08 20:04:06 +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.