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Pierre Langlois da2300f66e [heap] Relax accesses to a page's live byte count. 
Each page has a `live_byte_count_` field in its header and it is always accessed
with atomic operations. However, apart from one corner case, this field is only
accessed by the main thread so let's remove the atomicity by default.

To summarise, this changes the MarkingState accessors in the following way:

- IncrementalMarkingState:

Accesses of live_byte_count_ are now non-atomic. Concurrent marking uses local
maps of live bytes per page so we have exclusive access to the field when using
this.

- MajorAtomicMarkingState:

This accessor does not guarantee exclusive access to live_byte_count_ so we need
to keep the access atomic. This is used by the scavenger when migrating an
object that was marked black, since marking an object black will implicitly
increment the live_byte_count_.

Additionally, the live_bytes() and SetLiveBytes() accessor methods were not used
so remove them.

- MajorNonAtomicMarkingState:

Accesses of live_byte_count_ are not actually non-atomic.

- MinorNonAtomicMarkingState:

The `young_generation_live_byte_count_` field is atomic so we can set the memory
order manual to relax accesses.

Change-Id: I4c6457843783157ca878540e34ad50878afee20c
Cq-Include-Trybots: luci.v8.try:v8_linux64_tsan_rel
Reviewed-on: https://chromium-review.googlesource.com/c/1456095
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Pierre Langlois <pierre.langlois@arm.com>
Cr-Commit-Position: refs/heads/master@{#59548}
2019-02-13 10:33:09 +00:00
benchmarks [test] Ensure random generator in JSTests does not use float arithmetic 2018-12-17 10:05:08 +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 Always route builds through jumbo.gni for simpler code 2019-01-29 12:51:50 +00:00
include Move MicrotasksPolicy management to MicrotaskQueue 2019-02-12 06:06:15 +00:00
infra [test] Bump shards on slow bots 2019-02-12 15:36:57 +00:00
samples Add a sample that uses the JS API to create wasm 2018-06-07 23:43:38 +00:00
src [heap] Relax accesses to a page's live byte count. 2019-02-13 10:33:09 +00:00
test [array] Fix Array#map storing signaling NaNs 2019-02-13 10:23:19 +00:00
testing Remove dummy files created for rolling googletest. 2018-03-27 05:55:56 +00:00
third_party Roll third_party/inspector_protocol to a0abcb6bfbd8d13071bb0d2ac4ee1066703eb60a. 2019-02-13 00:12:13 +00:00
tools [stack trace] Introduce StackTraceFrame object 2019-02-13 07:24:18 +00:00
.clang-format [clang-format] Don't derive pointer alignment 2017-01-17 09:28:19 +00:00
.clang-tidy [tool] Remove unfixed clang-tidy warnings to ease use. 2018-10-26 07:40:32 +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 Revert "[build] Port "Add patched eu-strip in third_party"" 2019-01-31 16:44:20 +00:00
.gn [test] Remove obsolete test262 archive extract 2018-03-28 13:52:15 +00:00
.vpython [tools] Correctly identify and report test crashes and infra failures 2018-10-30 15:05:40 +00:00
.ycm_extra_conf.py [ycm] Switch from gnu++11 to gnu++14 2017-11-27 07:48:21 +00:00
AUTHORS DISALLOW_IMPLICIT_CONSTRUCTORS for MacroAssembler 2019-02-07 09:21:34 +00:00
BUILD.gn [stack trace] Introduce StackTraceFrame object 2019-02-13 07:24:18 +00:00
ChangeLog [release] Merge ChangeLog back to master 2018-12-07 15:41:59 +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 [auto-roller] flatten the recursive deps for chromium buildtools 2019-02-12 09:14:01 +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 Reduce wasm OWNERS to current team members 2018-10-15 14:47:49 +00:00
PRESUBMIT.py Optionally use halfsiphash for integer hashing. 2019-01-09 15:20:51 +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 Reland "Add Windows ARM64 ABI support to V8" 2018-10-24 19:46:36 +00:00
WATCHLISTS Update WATCHLIST wrt yangguo 2018-11-23 08:29:12 +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.