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Michael Achenbach ec21639857 Revert "[es2015] Introduce JSDataView::external_pointer." 
This reverts commit 46573e51d8.

Reason for revert: Speculative revert for breaking chromium integration.

Might break gpu tests and linux debug:
https://ci.chromium.org/p/v8/builders/luci.v8.ci/Mac%20V8%20FYI%20Release%20(Intel)/2554

Also blocks the roll:
https://chromium-review.googlesource.com/c/chromium/src/+/1234328

Original change's description:
> [es2015] Introduce JSDataView::external_pointer.
> 
> This adds a new external_pointer field to every JSDataView instance
> which points directly into the backing store at the given view's
> byte_offset. This was the DataView performance is now almost on
> par with the TypedArray performance for accessing aligned memory
> (with appropriate endianess). This also serves as prepatory work
> to enable full 64-bit addressing of DataView backing stores in
> optimized code (soonish).
> 
> This change optimizes the bounds checking sequence in TurboFan in
> such a way that it further improves the DataView set/get performance
> by around 10%, almost closing the remaining gap between DataViews
> and TypedArrays.
> 
> Drive-by-fix: Get rid of the code duplication around DataView inlining
> in the JSCallReducer and have only a single bottleneck method now.
> 
> Bug: chromium:225811, v8:4153, v8:7881, v8:8171
> Change-Id: I9118efd4d19e93f0e51c931a9bec1a56a0f4593e
> Reviewed-on: https://chromium-review.googlesource.com/1231994
> Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
> Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
> Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
> Reviewed-by: Yang Guo <yangguo@chromium.org>
> Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#56042}

TBR=yangguo@chromium.org,mlippautz@chromium.org,tebbi@chromium.org,bmeurer@chromium.org

Change-Id: I614a90043b1574b19936c37987db94806cac3bd7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:225811, v8:4153, v8:7881, v8:8171
Reviewed-on: https://chromium-review.googlesource.com/1234417
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56059}
2018-09-20 06:31:33 +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 [heap] Remove obsolete AbortTracing calls and deprecate interface 2018-09-19 05:17:21 +00:00
infra [test] Bump shards on slowest trybots 2018-09-13 07:34:11 +00:00
samples Add a sample that uses the JS API to create wasm 2018-06-07 23:43:38 +00:00
src Revert "[es2015] Introduce JSDataView::external_pointer." 2018-09-20 06:31:33 +00:00
test [d8] Update new Worker API to match the Web API 2018-09-20 00:10:28 +00:00
testing Remove dummy files created for rolling googletest. 2018-03-27 05:55:56 +00:00
third_party [torque] Add linter rule for 'label' naming convention 2018-09-18 09:20:23 +00:00
tools [tools] Do not auto-CC v8-reviews@ on CLs created by branch creator script 2018-09-19 13:41:36 +00:00
.clang-format [clang-format] Don't derive pointer alignment 2017-01-17 09:28:19 +00:00
.clang-tidy Add a tool/script to run clang-tidy over V8. 2018-09-11 12:01:09 +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 .gitattributes: Mark minified emscripten js files as -diff 2018-09-19 16:27:10 +00:00
.gitignore stop depsing in gyp 2018-09-03 14:13:18 +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 [Intl] Rename dayperiod to dayPeriod 2018-09-14 17:04:03 +00:00
BUILD.gn [turbofan] Implement constant folding of string concatenations 2018-09-19 09:47:23 +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. 2018-09-20 03:53:46 +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 Make my watchlists easier to filter 2018-08-30 15:28:02 +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.