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Dan Elphick f602712f6f [snapshot] Create a ReadOnly snapshot 
In preparation for sharing RO_SPACE between all Isolates within a
process, this first pulls RO_SPACE out of the Startup snapshot and puts
it in its own ReadOnly snapshot.

The snapshot is first populated with the read-only roots. After that the
StartupSerializer serializes as before but starting from the first
mutable root. References to objects in the ReadOnly snapshot that aren't
themselves roots are added to a new cache called ReadOnlyObjectCache
which functions like the PartialSnapshotCache but lives in the
ReadOnlySerializer rather than the StartupSerializer. These cache
entries are referenced using a new bytecode: ReadOnlyObjectCache. (To
make room for this, the ApiReference bytecode has been moved).

To reduce code duplication, the StartupSerializer has been refactored to
create a new base class RootSerializer, which ReadOnlySerializer also
subclasses. The base class is responsible primarily for keeping track of
already serialized roots and visiting the roots.

Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Change-Id: Iff26042886130ae22eccf2e11b35f6f226f4a792
Bug: v8:8191
Reviewed-on: https://chromium-review.googlesource.com/c/1244676
Commit-Queue: Dan Elphick <delphick@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56681}
2018-10-16 10:13:20 +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 [build] disable asan on Windows for Torque 2018-10-10 11:47:40 +00:00
include [api] Remove deprecated EmbedderHeapTracer APIs 2018-10-15 16:37:49 +00:00
infra [test] Bump shards on MSAN 2018-10-11 13:16:13 +00:00
samples Add a sample that uses the JS API to create wasm 2018-06-07 23:43:38 +00:00
src [snapshot] Create a ReadOnly snapshot 2018-10-16 10:13:20 +00:00
test [snapshot] Create a ReadOnly snapshot 2018-10-16 10:13:20 +00:00
testing Remove dummy files created for rolling googletest. 2018-03-27 05:55:56 +00:00
third_party [torque] Implement implicit parameters 2018-10-11 09:49:30 +00:00
tools [tools] Add verify_csa statusfile param 2018-10-16 09:48:05 +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 [postmortem] add postmortem metadata for Promises 2018-10-10 11:25:45 +00:00
BUILD.gn [snapshot] Create a ReadOnly snapshot 2018-10-16 10:13:20 +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 Update V8 DEPS. 2018-10-16 04:26:02 +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 Fix nits in presubmit.py and handling of .tq otherwise formatting 2018-09-25 15:37:39 +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.