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Benedikt Meurer c7ca8dacd2 [turbofan] Use CheckHeapObject only for StoreField. 
Previously we had to use CheckHeapObject in front of every CheckMaps,
CompareMaps and TransitionElementsKind operation. Now these operators
request HeapObject representation themselves (requiring for CompareMaps
and TransitionElementsKind to remove the kNoDeopt property). This means
we only do CheckHeapObject for StoreField to a field that has HeapObject
representation.

This not only leads to smaller graphs in the compiler, but also removes
most uses of the CheckHeapObject operator, which doesn't express a real
semantic property in the compiler frontend.

Bug: v8:9183, v8:9250
Refs: nodejs/node#27667
Change-Id: Ie3d83de69583b1bed6c1c53444bfc97aaef624bb
Cq-Include-Trybots: luci.chromium.try:linux-rel,win7-rel
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1612902
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61508}
2019-05-15 09:08:55 +00:00
benchmarks [test] Ensure random generator in JSTests does not use float arithmetic 2018-12-17 10:05:08 +00:00
build_overrides [tracing] Add build config for Perfetto behind a flag 2019-03-28 09:26:52 +00:00
custom_deps [build] Add common directory for custom deps 2018-06-08 19:23:02 +00:00
docs [docs] Change links from old wiki to v8.dev 2019-03-07 12:13:30 +00:00
gni [build] Compile compiler with optimizations in fast mksnapshot mode 2019-04-09 13:34:32 +00:00
include make deleted functions public in include 2019-05-13 07:58:31 +00:00
infra Revert "Reland "[ptr-compr][x64] Temporarily enable pointer compression on x64"" 2019-05-10 20:28:16 +00:00
samples Add OWNERS file for samples/ 2019-05-14 16:55:03 +00:00
src [turbofan] Use CheckHeapObject only for StoreField. 2019-05-15 09:08:55 +00:00
test [js-perf-test] Add additional benchmarks for boolean constructor 2019-05-15 09:07:15 +00:00
testing Remove dummy files created for rolling googletest. 2018-03-27 05:55:56 +00:00
third_party [DevTools] Roll inspector_protocol 2019-05-09 21:37:04 +00:00
tools [tools] Import gdbinit from Chromium 2019-05-14 16:39:08 +00:00
.clang-format [clang-format] Don't derive pointer alignment 2017-01-17 09:28:19 +00:00
.clang-tidy [tool] Remove unfixed clang-tidy warnings to ease use. 2018-10-26 07:40:32 +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 Add .ccls-cache to .gitignore 2019-02-26 10:32:45 +00:00
.gn v8: Stop setting secondary_source. 2019-05-13 16:06:53 +00:00
.vpython [tools] Implement confidence-based number of runs 2019-05-09 09:42:28 +00:00
.ycm_extra_conf.py [ycm] Switch from gnu++11 to gnu++14 2017-11-27 07:48:21 +00:00
AUTHORS make deleted functions public in include 2019-05-13 07:58:31 +00:00
BUILD.gn Reland of Port Proxy SetProperty trap builtin to Torque 2019-05-14 18:06:46 +00:00
ChangeLog [release] Merge ChangeLog back to master 2018-12-07 15:41:59 +00:00
CODE_OF_CONDUCT.md
codereview.settings Make Gerrit the default code review for V8 2017-06-30 17:37:37 +00:00
DEPS Update wasm-spec. 2019-05-15 04:56:04 +00:00
LICENSE [wasm] Draft version of C/C++ Wasm API 2019-04-17 16:00:26 +00:00
LICENSE.fdlibm Add LICENSE.fdlibm for all the fdlibm imported sources. 2016-06-09 07:17:03 +00:00
LICENSE.strongtalk
LICENSE.v8
LICENSE.valgrind
OWNERS [owners] Add szuend@chromium.org to top level owners 2019-03-18 09:37:52 +00:00
PRESUBMIT.py Revert "[torque] Temporarily disable torque format check to pass presubmit" 2019-02-20 14:07:17 +00:00
README.md [docs] Change links from old wiki to v8.dev 2019-03-07 12:13:30 +00:00
snapshot_toolchain.gni Make win/cross build work better when targeting arm64 on macOS hosts. 2019-03-22 18:30:23 +00:00
WATCHLISTS Update WATCHLIST wrt yangguo 2018-11-23 08:29:12 +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://v8.dev/docs

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 at v8.dev/docs/contribute.