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Michael Lippautz ee3016b7c0 cppgc-js: Support eager traced value in ephemeron pairs 
Before this patch, both key and value of an ephemeron pair was always
considered to be GarbageCollected objects.

This patch adjusts the snapshotting mechanism to accomodate that
values may not be GarbageCollected objects and must thus be eagerly
traced for visibility and edge creation.

In practice this only shows up in Blink when associating an existing
wrappable with a wrapper in a non-main world, e.g., through an
extension. In this case, DOMWrapperMap keeps the wrapper value through
a TracedReference in the ephemeron map with the existing wrappable as
key. The semantics are intended to be general ephemeron semantics,
i.e., value needs to be kept alive when the key is alive.  This is
visualized in DevTools as the main wrapper/wrappable pair (which is
merged into a single node for the snapshot) retaining the non-main
world wrapper.

Bug: chromium:1245894
Change-Id: Ibfa6722f20c76f94c310f9a040f0d3d4b9083bbb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3140601
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#76658}
2021-09-03 14:09:11 +00:00
.github [github] Close PRs created on the V8 GitHub mirror automatically 2021-01-12 08:39:59 +00:00
bazel [bazel] Initial support to mjsunit tests 2021-08-09 14:12:02 +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 [LOONG64] Add LoongArch64 backend 2021-08-16 13:05:19 +00:00
include cppgc: Fix compilation of young generation 2021-09-01 07:24:23 +00:00
infra [test] Run no-concurrent-inlining variant 2021-09-03 12:16:59 +00:00
samples Reland "[include] Split out v8.h" 2021-08-24 13:08:55 +00:00
src cppgc-js: Support eager traced value in ephemeron pairs 2021-09-03 14:09:11 +00:00
test [wasm] Update wasm spec tests 2021-09-03 13:19:29 +00:00
testing [macros] Upstream Google3 changes 2021-06-24 16:36:14 +00:00
third_party Roll inspector-protocol to 32cf5f2bf4dc20c73ead291e68d2e2f6b638cd57 2021-07-09 13:01:24 +00:00
tools [test] Run no-concurrent-inlining variant 2021-09-03 12:16:59 +00:00
.bazelrc [bazel] Support build mode compilation 2021-07-13 10:14:16 +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 [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 [tools] Implement confidence-based number of runs 2019-05-09 09:42:28 +00:00
.ycm_extra_conf.py [ycm] Fix python script 2021-07-29 09:48:32 +00:00
AUTHORS [date] Fix Date#getMinutes() test failures 2021-08-18 14:54:40 +00:00
BUILD.bazel heap: Ignore TSAN when walking the stack conservatively 2021-09-01 13:42:13 +00:00
BUILD.gn heap: Ignore TSAN when walking the stack conservatively 2021-09-01 13:42:13 +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
COMMON_OWNERS Remove mythria@ from OWNERS 2021-08-26 13:21:32 +00:00
DEPS Update reclient version to re_client_version:0.40.0.40ff5a5. 2021-09-03 08:47:30 +00:00
DIR_METADATA Add DIR_METADATA files to v8. 2020-10-20 22:12:28 +00:00
ENG_REVIEW_OWNERS Remove rmcilroy from OWNERS. 2021-08-19 16:30:27 +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 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
LOONG_OWNERS [LOONG64] Add LoongArch64 backend 2021-08-16 13:05:19 +00:00
MIPS_OWNERS [mips] Request to be an owner of MIPS files 2020-11-23 09:43:49 +00:00
OWNERS Make autoroll account owner of auto-updated file 2021-08-24 15:05:13 +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 [riscv64] Change one of the owners for RISCV. 2021-04-20 14:39:26 +00:00
S390_OWNERS Adding myself to relevant OWNERS files. 2020-11-02 16:37:28 +00:00
WATCHLISTS cppgc: Report cppgc changes to oilpan-reviews@chromium.org 2021-08-30 14:28:32 +00:00
WORKSPACE [bazel] Adds ICU 2021-06-30 12:54:15 +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.