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Hao Xu c587ec5464 [CSA] Fast path Smi operands in BitwiseSmi bytecodes 
In current BitwiseSmi bytecodes the code to do Smi operation is inside a
loop. This CL fast path the Smi operation by peeling the first Smi check
out of the loop, and avoid Smi->Int->Smi conversion where possible.

Drive-by fix: Add CSA_DCHECK in Smi shift to avoid unexpected use.

Bug: v8:12442
Change-Id: I1adce560fb22a4409337e2958779eccf9197e4ff
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3328784
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Hao A Xu <hao.a.xu@intel.com>
Cr-Commit-Position: refs/heads/main@{#78764}
2022-01-26 09:14:23 +00:00
.github [github] Close PRs created on the V8 GitHub mirror automatically 2021-01-12 08:39:59 +00:00
bazel [bazel] Cleanup style with Buildifier. 2022-01-11 10:00:36 +00:00
build_overrides [build] Remove obsolete gn flag 2021-01-11 15:50:59 +00:00
custom_deps Use relative paths to OWNERS files 2019-08-12 13:52:52 +00:00
docs Add OWNERS for docs/ 2019-05-15 12:06:15 +00:00
gni Consolidate arguments that change together on branch cut 2022-01-20 11:20:09 +00:00
include Revert "Reland "[string] Support shared strings in Value{Serializer,Deserializer}"" 2022-01-26 09:12:18 +00:00
infra Increase shards for test262 on V8 Linux64 ASAN 2022-01-19 15:07:49 +00:00
samples cppgc: Fix hello world 2022-01-25 16:34:14 +00:00
src [CSA] Fast path Smi operands in BitwiseSmi bytecodes 2022-01-26 09:14:23 +00:00
test Revert "Reland "[string] Support shared strings in Value{Serializer,Deserializer}"" 2022-01-26 09:12:18 +00:00
testing [test][cleanup] Fix -Wshadow warnings in unittests 2021-09-27 08:59:01 +00:00
third_party Roll inspector_protocol to 5221cbfa7f940d56ae8b79bf34c446a56781dd56 2022-01-24 09:16:35 +00:00
tools [ShadowRealm] Part 1 - Skeleton 2022-01-25 18:10:57 +00:00
.bazelrc [bazel] Use v8_enable_handle_zapping only in debug builds. 2022-01-11 11:32:39 +00:00
.clang-format
.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
.flake8 remove swarming_client 2021-08-24 10:39:33 +00:00
.git-blame-ignore-revs [infra] Update .git-blame-ignore-revs 2020-03-03 12:59:13 +00:00
.gitattributes .gitattributes: Mark minified emscripten js files as -diff 2018-09-19 16:27:10 +00:00
.gitignore remove swarming_client 2021-08-24 10:39:33 +00:00
.gn Revert "[build] Separate out inspector as a shared library" 2021-07-02 16:15:20 +00:00
.mailmap Restore consistency between .mailmap and AUTHORS 2021-06-24 08:58:04 +00:00
.vpython Verify mac-arm64 wheels for v8/.vpython spec. 2021-09-15 21:11:50 +00:00
.vpython3 Add vpython3 to DEPS 2021-11-05 18:08:29 +00:00
.ycm_extra_conf.py [ycm] Fix python script 2021-07-29 09:48:32 +00:00
AUTHORS [snapshot] The length of the snapshot version string is 64 bytes 2022-01-10 14:46:58 +00:00
BUILD.bazel [bazel] Fix build by removing deleted file after inspector roll 2022-01-25 19:58:46 +00:00
BUILD.gn [ext-code-space] Support V8 sandbox mode 2022-01-25 23:12:18 +00:00
CODE_OF_CONDUCT.md
codereview.settings Make Gerrit the default code review for V8 2017-06-30 17:37:37 +00:00
COMMON_OWNERS [owners] Add nikolaos@ to common owners 2022-01-12 09:37:27 +00:00
DEPS Update google_benchmark 2022-01-25 07:01:35 +00:00
DIR_METADATA Add DIR_METADATA files to v8. 2020-10-20 22:12:28 +00:00
ENG_REVIEW_OWNERS Add verwaest@ to ENG_REVIEW_OWNERS. 2021-09-16 15:00:57 +00:00
INFRA_OWNERS Add team members as owners 2020-08-18 08:29:04 +00:00
INTL_OWNERS add ftang as owner 2020-04-24 19:19:36 +00:00
LICENSE [wasm] Draft version of C/C++ Wasm API 2019-04-17 16:00:26 +00:00
LICENSE.fdlibm
LICENSE.strongtalk
LICENSE.v8
LOONG_OWNERS [LOONG64] Add LoongArch64 backend 2021-08-16 13:05:19 +00:00
MIPS_OWNERS [mips] Add LiuYu to MIPS_OWNERS 2021-09-08 01:38:52 +00:00
OWNERS Let infra owners own all dot files 2021-11-05 18:57:18 +00:00
PPC_OWNERS Adding myself to relevant OWNERS files. 2020-11-02 16:37:28 +00:00
PRESUBMIT.py [bigint] Move multiplication to src/bigint/ 2021-04-19 15:40:43 +00:00
README.md [docs] Change links from old wiki to v8.dev 2019-03-07 12:13:30 +00:00
RISCV_OWNERS Add Lu Yahan to RISC-V owners list 2021-09-13 16:35:00 +00:00
S390_OWNERS Adding myself to relevant OWNERS files. 2020-11-02 16:37:28 +00:00
WATCHLISTS Add myself to heap/ watchlist 2021-11-08 16:58:14 +00:00
WORKSPACE [bazel] Cleanup style with Buildifier. 2022-01-11 10:00:36 +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.