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Manos Koukoutos 455d38ff8d Reland "[wasm-gc] Introduce wasm null object"
This is a reland of commit 2e357c4814

Difference compared to original: Initialize wasm-null object's
payload.

Original change's description:
> [wasm-gc] Introduce wasm null object
>
> We introduce a wasm null object, separate from JS null. Its purpose is
> to support trapping null accesses for wasm objects.
> This will be achieved by allocating a large payload for it (larger than
> any wasm struct) and memory-protecting it (see linked CL). The two null
> objects get mapped to each other at the wasm-JS boundary.
> Since externref objects live on the JS side of the boundary,
> null-related instructions in wasm now need an additional type argument
> to handle the correct null object.
>
> Bug: v8:7748
> Change-Id: I06da00fcd279cc5376e69ab7858e3782f5b5081e
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4200639
> Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
> Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
> Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#85648}

Bug: v8:7748
Change-Id: I46413d05f0213229f1d19277ae98dbb8df5afdf9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4224011
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#85705}
2023-02-07 11:19:47 +00:00
.github [github] Close PRs created on the V8 GitHub mirror automatically 2021-01-12 08:39:59 +00:00
bazel [bazel] Fix the icu build and buildifier warnings 2023-02-01 15:00:23 +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 [ios] Enable ability to run V8 in jitless mode on iOS device 2023-01-31 18:41:43 +00:00
include Reland "[wasm-gc] Introduce wasm null object" 2023-02-07 11:19:47 +00:00
infra Configure PGO builders 2023-01-27 13:54:32 +00:00
samples [sandbox] Initialize sandbox during V8::Initialize 2022-07-15 09:29:32 +00:00
src Reland "[wasm-gc] Introduce wasm null object" 2023-02-07 11:19:47 +00:00
test Reland "[wasm-gc] Introduce wasm null object" 2023-02-07 11:19:47 +00:00
testing [test] Migrate cctest/test-api-accessors.cc to unittests/ 2022-05-17 08:27:55 +00:00
third_party [reland] adds the ability for v8 to use sin/cos from libm 2022-12-02 21:59:04 +00:00
tools Reland "[wasm-gc] Introduce wasm null object" 2023-02-07 11:19:47 +00:00
.bazelrc [bazel] Use v8_enable_handle_zapping only in debug builds. 2022-01-11 11:32:39 +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
.flake8 remove swarming_client 2021-08-24 10:39:33 +00:00
.git-blame-ignore-revs [git blame] Add a few old refactors to .git-blame-ignore-revs 2023-01-04 15:43:38 +00:00
.gitattributes .gitattributes: Mark minified emscripten js files as -diff 2018-09-19 16:27:10 +00:00
.gitignore [tools] Improve run_perf.py 2023-01-31 10:24:16 +00:00
.gn [fuchsia] Add API target level default value 2022-08-29 14:46:45 +00:00
.mailmap Add .mailmap entries for jgruber 2022-08-04 08:53:02 +00:00
.style.yapf [tools] Add basic pointer compression to grokdump 2022-02-04 14:35:26 +00:00
.vpython3 Reland "[resultdb] Add ResultDB indicator" 2022-10-14 11:05:59 +00:00
.ycm_extra_conf.py [ycm] Fix YouCompleteMe config 2022-11-02 15:59:48 +00:00
AUTHORS Revert "[turbofan] Optimize access to the length property of functions" 2023-01-23 08:58:42 +00:00
BUILD.bazel [codegen] Merge Turbo and Macro assemblers 2023-02-02 09:27:45 +00:00
BUILD.gn Reland "[wasm-gc] Introduce wasm null object" 2023-02-07 11:19:47 +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 mliedtke to COMMON_OWNERS 2022-09-16 14:12:27 +00:00
DEPS Update V8 DEPS (trusted) 2023-02-07 08:41:03 +00:00
DIR_METADATA Add DIR_METADATA files to v8. 2020-10-20 22:12:28 +00:00
ENG_REVIEW_OWNERS Add mlippautz@ to ENG_REVIEW_OWNERS. 2022-10-06 18:48:33 +00:00
INFRA_OWNERS [infra] Add alexschulze@ as infra owner 2022-07-18 09:08:54 +00:00
INTL_OWNERS add ftang as owner 2020-04-24 19:19:36 +00:00
LICENSE [mips32] Delete mips32 from v8 2022-09-13 07:54:54 +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 Make .ycm_extra_conf owned by COMMON_OWNERS 2022-11-07 09:51:53 +00:00
PPC_OWNERS PPC/S390: cleanup owner files 2023-01-23 17:07:21 +00:00
PRESUBMIT.py [presubmit] Handle Windows path for header guard check 2022-12-13 17:30:02 +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 PPC/S390: cleanup owner files 2023-01-23 17:07:21 +00:00
WATCHLISTS Add tests directory to watchlist 2023-02-06 13:41:05 +00:00
WORKSPACE [bazel] Remove zlib dependency 2022-08-17 15:30:25 +00:00

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.