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Michael Achenbach 223e0088ef Revert "[heap] Move initial objects into RO_SPACE" 
This reverts commit f8ae62fe14.

Reason for revert:
https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20-%20internal%20snapshot/builds/14825

Original change's description:
> [heap] Move initial objects into RO_SPACE
> 
> This moves:
> * the main oddballs (null, undefined, hole, true, false) as well as
> their supporting maps (also adds hole as an internalized string to make
> this work).
> * most of the internalized strings
> * the struct maps
> * empty array
> * empty enum cache
> * the contents of the initial string table
> * the weak_cell_cache for any map in RO_SPACE (and eagerly creates the
> value avoid writing to it during run-time)
> 
> The StartupSerializer stats change as follows:
> 
>      RO_SPACE  NEW_SPACE  OLD_SPACE  CODE_SPACE  MAP_SPACE  LO_SPACE
> old         0          0     270264       32608      12144         0
> new     21776          0     253168       32608       8184         0
> Overall memory usage has increased by 720 bytes due to the eager
> initialization of the Map weak cell caches.
> 
> Also extends --serialization-statistics to print out separate instance
> type stats for objects in RO_SPACE as shown here:
> 
>   Read Only Instance types (count and bytes):
>        404      16736  ONE_BYTE_INTERNALIZED_STRING_TYPE
>          2         32  HEAP_NUMBER_TYPE
>          5        240  ODDBALL_TYPE
>         45       3960  MAP_TYPE
>          1         16  BYTE_ARRAY_TYPE
>          1         24  TUPLE2_TYPE
>          1         16  FIXED_ARRAY_TYPE
>          1         32  DESCRIPTOR_ARRAY_TYPE
>         45        720  WEAK_CELL_TYPE
> 
> Bug: v8:7464
> Change-Id: I12981c39c82a7057f68bbbe03f89fb57b0b4c6a6
> Reviewed-on: https://chromium-review.googlesource.com/973722
> Commit-Queue: Dan Elphick <delphick@chromium.org>
> Reviewed-by: Hannes Payer <hpayer@chromium.org>
> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
> Reviewed-by: Yang Guo <yangguo@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#52435}

TBR=rmcilroy@chromium.org,yangguo@chromium.org,hpayer@chromium.org,mlippautz@chromium.org,delphick@chromium.org

Change-Id: Ie62a73a5be3b21a15bb46e342acb3e808fbaa4f3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7464
Reviewed-on: https://chromium-review.googlesource.com/999653
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52440}
2018-04-06 12:42:37 +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 Reland "[build] Remove legacy isolate configurations" 2018-03-28 12:36:55 +00:00
include [debug] expose SideEffectType for whitelisting embedder callbacks 2018-04-04 20:08:00 +00:00
infra [build] Add MB config for new cfi trybot 2018-04-06 11:37:06 +00:00
samples [sample] fix potential memory leak. 2018-02-21 13:06:18 +00:00
src Revert "[heap] Move initial objects into RO_SPACE" 2018-04-06 12:42:37 +00:00
test [test] Mark slow tests 2018-04-06 12:28:56 +00:00
testing Remove dummy files created for rolling googletest. 2018-03-27 05:55:56 +00:00
third_party Roll googletest to 1.8.0+. 2018-03-23 07:54:27 +00:00
tools Revert "[heap] Move initial objects into RO_SPACE" 2018-04-06 12:42:37 +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 [test] Remove obsolete test262 archive extract 2018-03-28 13:52:15 +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 Remove duplicated file listed in BUILD.gn 2018-04-05 18:31:54 +00:00
BUILD.gn [build] Align all debug-specific options behind v8_debug gn arg 2018-04-06 11:04:23 +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 [tools] update node fetch_deps.py for gn 2018-04-06 07:35:33 +00:00
LICENSE Updates to the license information of third party components. 2015-06-16 12:37:50 +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 [gyp] remove gyp files. 2018-02-08 20:04:06 +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.