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Yang Guo bcb8d49b2c [snapshot] add checksum to startup snapshot 
We already had checksumming for code cache data. We now extend
checksumming to the startup snapshot to catch data corruption early.

The performance impact for deserialization is a regression of 1-2%,
which should be acceptable.

Sample output for the included test with --profile-deserialization:

[Verifying snapshot checksum took 0.023 ms]
[Deserializing isolate (134348 bytes) took 1.891 ms]
[Verifying snapshot checksum took 0.024 ms]
[Deserializing isolate (134348 bytes) took 1.654 ms]
[Deserializing context #0 (47208 bytes) took 0.331 ms]
Deserialization will reserve:
    208168 bytes per isolate
    123368 bytes per context #0
Snapshot blob consists of:
    134492 bytes in 6 chunks for startup
    115272 bytes for builtins
     47152 bytes in 31 chunks for context #0
[Verifying snapshot checksum took 0.048 ms]
[Verifying snapshot checksum took 0.043 ms]

R=peria@chromium.org, petermarshall@chromium.org

Bug: chromium:881417
Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Change-Id: Ibc57520d459c86be8972f731aa35045b5e3751d7
Reviewed-on: https://chromium-review.googlesource.com/1241874
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56217}
2018-09-25 15:26:38 +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 Reland "[Compile] Refactor BackgroundCompileTask to enable its use by CompilerDispatcher" 2018-09-25 11:24:14 +00:00
infra [tools] Only apply android_unstripped_runtime_outputs on Android where it is defined 2018-09-21 17:48:23 +00:00
samples Add a sample that uses the JS API to create wasm 2018-06-07 23:43:38 +00:00
src [snapshot] add checksum to startup snapshot 2018-09-25 15:26:38 +00:00
test [snapshot] add checksum to startup snapshot 2018-09-25 15:26:38 +00:00
testing Remove dummy files created for rolling googletest. 2018-03-27 05:55:56 +00:00
third_party [torque] Improve formatting in format-torque 2018-09-24 10:08:00 +00:00
tools [torque]: Require formatting for .tq files in presubmit 2018-09-25 11:38:08 +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 [objects.h splitting] Move BuiltinFunctionId 2018-09-25 11:01:33 +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 [wasm] Update spec tests 2018-09-25 08:36:32 +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 [torque]: Require formatting for .tq files in presubmit 2018-09-25 11:38:08 +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.