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Dan Elphick 40f1aaf330 [heap] Mark RO_SPACE as read-only after deserialization 
Adds MarkAsReadOnly and MarkAsReadWrite to ReadOnlySpace. The latter
is only usable with ReadOnlySpace::WritableScope to avoid the space
being left writable). MarkAsReadOnly updates the high water mark and
makes several previously mutating methods into no-ops.

Moves some writes to immutable objects out of the bootstrapper to
setup-heap-internal so they don't write to a read-only page.

Also avoid writing hashes to strings that already have the value set as
that invariably means writing to the "0" and "1" constant strings in
RO_SPACE.

Before serialization, it makes RO_SPACE writable again so that any
padding can be cleared before writing it.

Bug: v8:7464
Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Change-Id: I22edc20dba7dde8943991a8fcaf87244af4490a3
Reviewed-on: https://chromium-review.googlesource.com/1014128
Commit-Queue: Dan Elphick <delphick@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52943}
2018-05-03 09:46:28 +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 Revert "Roll third_party/inspector_protocol to 59ca26e" 2018-04-23 17:38:31 +00:00
include [V8 Platform] Include missing header for abort() 2018-05-03 07:30:37 +00:00
infra [test] Add swarming dimensions for v8-side test specs 2018-05-03 08:39:48 +00:00
samples [sample] fix potential memory leak. 2018-02-21 13:06:18 +00:00
src [heap] Mark RO_SPACE as read-only after deserialization 2018-05-03 09:46:28 +00:00
test [heap] Mark RO_SPACE as read-only after deserialization 2018-05-03 09:46:28 +00:00
testing Remove dummy files created for rolling googletest. 2018-03-27 05:55:56 +00:00
third_party [torque] move Antlr to separate BUILD.gn file 2018-05-02 11:16:56 +00:00
tools Revert "[parser] Slice the source string where possible" 2018-05-02 15:32:13 +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 Add antlr4 runtime library to support Torque 2018-04-10 10:01:01 +00:00
.gn [test] Remove obsolete test262 archive extract 2018-03-28 13:52:15 +00:00
.vpython [tools] Add pypiwin32 pacakge to VPython config 2018-03-09 20:33:36 +00:00
.ycm_extra_conf.py [ycm] Switch from gnu++11 to gnu++14 2017-11-27 07:48:21 +00:00
AUTHORS Expose "$262.agent.monotonicNow()" for use in testing Atomic operation timeouts. Bug: v8:7705 2018-05-01 15:27:59 +00:00
BUILD.gn [torque] move Antlr to separate BUILD.gn file 2018-05-02 11:16:56 +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. 2018-05-03 06:24:17 +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 Adding a few more wasm related OWNERS. 2018-03-01 20:19:07 +00:00
PRESUBMIT.py [V8] Add back owners check 2018-04-27 07:43:39 +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 Remove v8-x87-ports@ from WATCHLIST 2018-02-26 19:56:21 +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.