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In the spec, WeakRefs that are dereferenced are kept alive until there's no JS on the stack, and then the host is expected to call ClearKeptObjects to clear those strong references [1]. HTML calls ClearKeptObjects at the end of a PerformMicrotaskCheckpoint [2]. In V8, leaving this up to the embedder is error prone in the same way the deprecated FinalizationGroup callback APIs were error prone: it depends on the embedder doing the right thing. This CL moves the call to ClearKeptObjects to be after running of microtasks within V8. However, the Isolate::ClearKeptObjects API should not be removed or deprecated in case an embedder uses an entirely custom MicrotaskQueue implementation and invokes MicrotaskQueue::PerformCheckpoint manually. [1] https://tc39.es/proposal-weakrefs/#sec-clear-kept-objects [2] https://github.com/whatwg/html/pull/4571 Bug: v8:8179 Change-Id: Ie243804157b56241ca69ed8fad300e839a0c9f75 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2055967 Commit-Queue: Shu-yu Guo <syg@chromium.org> Reviewed-by: Ulan Degenbaev <ulan@chromium.org> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org> Cr-Commit-Position: refs/heads/master@{#66327} |
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include | ||
infra | ||
samples | ||
src | ||
test | ||
testing | ||
third_party | ||
tools | ||
.clang-format | ||
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.editorconfig | ||
.flake8 | ||
.git-blame-ignore-revs | ||
.gitattributes | ||
.gitignore | ||
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.vpython | ||
.ycm_extra_conf.py | ||
AUTHORS | ||
BUILD.gn | ||
CODE_OF_CONDUCT.md | ||
codereview.settings | ||
COMMON_OWNERS | ||
DEPS | ||
ENG_REVIEW_OWNERS | ||
INFRA_OWNERS | ||
INTL_OWNERS | ||
LICENSE | ||
LICENSE.fdlibm | ||
LICENSE.strongtalk | ||
LICENSE.v8 | ||
LICENSE.valgrind | ||
MIPS_OWNERS | ||
OWNERS | ||
PPC_OWNERS | ||
PRESUBMIT.py | ||
README.md | ||
S390_OWNERS | ||
WATCHLISTS |
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.