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Jaroslav Sevcik 104a2db3c7 Revert "[deoptimizer] Staged materialization of objects." 
This reverts commit e71b802279.

Reason for revert: Need to have a back-mergeable fix.

Original change's description:
> [deoptimizer] Staged materialization of objects.
> 
> The existing object materialization in the deoptimizer has the following problems:
> 
> - Objects do not necessarily verify during materialization (because during the
>   depth first walk we might have inconsistent objects).
> 
> - Stack can overflow (because we just materialize using recursive calls).
> 
> - We generalize object fields.
> 
> 
> This CL re-implements the materialization algorithm to solve this problem. The
> new implementation creates the objects in two steps:
> 
> 1. We allocate space for all the objects. In general, we allocate ByteArrays
>    of the right size. For leaf objects that cannot participate in cycles,
>    we build and initialize the materialized objects completely.
> 
>    For JS objects, we insert markers into the byte array at the positions
>    where unboxed doubles are expected.
> 
> 2. We initialize all the objects with the proper field values and change the
>    map from the ByteArray map to the correct map. This requires some sync
>    with the concurrent marker (Heap::NotifyObjectLayoutChange).
> 
>    When initializing the JS object fields, we make sure that we respect
>    the unboxed double marker.
> 
> Bug: chromium:770106, v8:3836
> Change-Id: I1ec466a9d19db9538df4ba915516d4c3ca825632
> Reviewed-on: https://chromium-review.googlesource.com/777559
> Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#49821}

TBR=ulan@chromium.org,mstarzinger@chromium.org,jarin@chromium.org

Change-Id: I0657fb75330700dd7883c600dacb25676ebb47f9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:770106, v8:3836
Reviewed-on: https://chromium-review.googlesource.com/806160
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49834}
2017-12-04 16:02:21 +00:00
benchmarks Fix common misspellings 2017-08-02 09:35:28 +00:00
build_overrides Remove build_override for macOS min SDK and deployment target. 2017-07-14 18:24:44 +00:00
docs [Docs] Removed unused docs because they are moved to GitHub 2015-11-19 10:23:30 +00:00
gni [gn] Add v8_monolith static library target. 2017-11-27 10:07:51 +00:00
gypfiles [build] Add generic num fuzzer isolates 2017-11-10 14:26:48 +00:00
include [api] Mark SetNamedPropertyHandler as soon to be deprecated 2017-12-04 11:06:50 +00:00
infra [tools] Migrate 3 more builders to LUCI 2017-12-03 13:50:39 +00:00
samples [cleanup] use unique_ptr for the DefaultPlatform 2017-11-14 09:57:18 +00:00
src Revert "[deoptimizer] Staged materialization of objects." 2017-12-04 16:02:21 +00:00
test Revert "[deoptimizer] Staged materialization of objects." 2017-12-04 16:02:21 +00:00
testing Use GTEST_LANG_CXX11 in V8 2016-07-25 13:06:42 +00:00
third_party Roll third_party/inspector_protocol to 65caa48 2017-11-23 01:19:04 +00:00
tools [tools] Update tools/callstats.* with the new background GC group. 2017-12-04 15:46:28 +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 [d8] Fix --enable-tracing 2017-11-30 10:53:37 +00:00
.gn For building v8 using gn on aix_ppc64, linux_s390x and linux_ppc64(both LE and BE). 2017-05-12 01:35:09 +00:00
.vpython Add a comment for the VPython dep 2017-10-25 12:23:35 +00:00
.ycm_extra_conf.py [ycm] Switch from gnu++11 to gnu++14 2017-11-27 07:48:21 +00:00
AUTHORS Reland "[coverage] add coverage for binary expressions" 2017-11-24 08:44:23 +00:00
BUILD.gn Enable clang's -Wunreachable-code warning. 2017-12-04 13:09:25 +00:00
ChangeLog [Release] Update ChangeLog file 2016-02-17 21:29:09 +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 2017-12-04 09:09:54 +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
Makefile [test] Continued test support for make targets 2017-10-20 15:01:51 +00:00
Makefile.android [build] Fix d8-for-Android builds 2016-05-20 12:10:45 +00:00
OWNERS Add myself to OWNERS to be able to approve/make infra-related changes 2017-11-09 22:52:19 +00:00
PRESUBMIT.py Add vpython verification presubmit 2017-11-03 10:39:56 +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 Add adamk to a few WATCHLISTS 2017-11-10 21:38:29 +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.