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Benedikt Meurer 60d3f89d8a [turbofan] Consistently use the StringLength operator. 
Previously all internal accesses to the String::length field in TurboFan
would use the StringLength operator, whereas explicit `string.length`
accesses from user JavaScript code would use LoadField operators instead.
This inconsistency led to redundant loads of the String::length, for
example in case of code like

```js
subject.substring(1, subject.length - 1)
```

where the `subject.substring` call introduces a StringLength(subject)
node, and the `subject.length` introduces a LoadField[length](subject)
node.

Consistently using StringLength operator everywhere enables
optimizations in TurboFan that had been blocked before here (besides
avoiding the redundant load operations).

Bug: v8:8015
Change-Id: I21c82bc418105b9933a9e60dde11c7b222dfcf4f
Reviewed-on: https://chromium-review.googlesource.com/1212942
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55710}
2018-09-07 10:04:07 +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 [cleanup] Split out v8-internal.h from include/v8.h 2018-09-07 09:55:25 +00:00
infra [test] Add more test suites to Android testing 2018-09-07 09:53:15 +00:00
samples Add a sample that uses the JS API to create wasm 2018-06-07 23:43:38 +00:00
src [turbofan] Consistently use the StringLength operator. 2018-09-07 10:04:07 +00:00
test [test] Add more test suites to Android testing 2018-09-07 09:53:15 +00:00
testing Remove dummy files created for rolling googletest. 2018-03-27 05:55:56 +00:00
third_party [cleanup] Remove unnecessary calls to FillFixedArrayWithSmiZero 2018-09-07 07:17:05 +00:00
tools [RCS / TurboFan] Enable basic off-thread RCS for Concurrent Optimization. 2018-09-07 10:02:27 +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 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 Remove unused symbol in mark-compact.h 2018-09-05 17:00:18 +00:00
BUILD.gn [cleanup] Split out v8-internal.h from include/v8.h 2018-09-07 09:55:25 +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. 2018-09-07 03:51:59 +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.