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Simon Zünd f96f93128c Reland "Implement top-level await for REPL mode" 
This is a reland of 5bddc0e142

The original CL was speculatively reverted as it was suspected to
cause failures on the non-determinism bot. This was ultimately
confirmed to not be the case, so this CL is safe to reland as-is.

Original change's description:
> Implement top-level await for REPL mode
>
> Design doc: bit.ly/v8-repl-mode
>
> This CL allows the usage of 'await' without wrapping code in an async
> function when using REPL mode in global evaluate. REPL mode evaluate
> is changed to *always* return a Promise. The resolve value of the
> promise is the completion value of the REPL script.
>
> The implementation is based on two existing mechanisms:
>   - Similar to async functions, the content of a REPL script is
>     enclosed in a synthetic 'try' block. Any thrown error
>     is used to reject the Promise of the REPL script.
>
>   - The content of the synthetic 'try' block is also re-written the
>     same way a normal script is. This is, artificial assignments to
>     a ".result" variable are inserted to simulate a completion
>     value. The difference for REPL scripts is, that ".result" is
>     used to resolve the Promise of the REPL script.
>
>   - ".result" is not returned directly but wrapped in an object
>     literal: "{ .repl_result: .result}". This is done to prevent
>     resolved promises from being chained and resolved prematurely:
>
>     > Promse.resolve(42);
>
>     should evaluate to a promise, not 42.
>
> Bug: chromium:1021921
> Change-Id: I00a5aafd9126ca7c97d09cd8787a3aec2821a67f
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1900464
> Reviewed-by: Yang Guo <yangguo@chromium.org>
> Reviewed-by: Leszek Swirski <leszeks@chromium.org>
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Commit-Queue: Simon Zünd <szuend@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#65273}

TBR: yangguo@chromium.org,verwaest@chromium.org
Bug: chromium:1021921
Change-Id: I95c5dc17593161009a533188f91b4cd67234c32f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1954388
Reviewed-by: Simon Zünd <szuend@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65360}
2019-12-06 10:13:00 +00:00
build_overrides Use relative paths to OWNERS files 2019-08-12 13:52:52 +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 [build] Move split_static_library.gni from Chromium repo 2019-11-04 15:45:54 +00:00
include Update V8 version after branch cut 2019-12-05 14:45:51 +00:00
infra [test] Use Fuchsia test runner for unittests 2019-12-05 14:22:01 +00:00
samples [cleanup] Drop some occurrences of Isolate::Current 2019-06-26 19:39:21 +00:00
src Reland "Implement top-level await for REPL mode" 2019-12-06 10:13:00 +00:00
test Reland "Implement top-level await for REPL mode" 2019-12-06 10:13:00 +00:00
testing Use relative paths to OWNERS files 2019-08-12 13:52:52 +00:00
third_party [DevTools] Roll inspector_protocol (V8) 2019-12-05 22:31:08 +00:00
tools Reland "Implement top-level await for REPL mode" 2019-12-06 10:13:00 +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 Add .flake8 to allow for python style checking. 2019-07-19 21:44:03 +00:00
.git-blame-ignore-revs Add recent code rewrite to .git-blame-ignore-revs 2019-05-23 10:38:45 +00:00
.gitattributes .gitattributes: Mark minified emscripten js files as -diff 2018-09-19 16:27:10 +00:00
.gitignore Add .clangd to .gitignore 2019-12-01 11:39:11 +00:00
.gn [build] Dynamically decide if to use system xcode 2019-07-29 08:20:24 +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 [builtins] Port Number.prototype.toString to Torque 2019-11-05 11:00:26 +00:00
BUILD.gn [promises] Port PromiseConstructor to Torque. 2019-11-26 15:07:31 +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 Rename clemensh to clemensb in OWNERS 2019-09-26 08:44:44 +00:00
DEPS Update V8 DEPS. 2019-12-06 04:16:08 +00:00
ENG_REVIEW_OWNERS Add eng review owners as escalation path 2019-05-15 19:12:10 +00:00
INFRA_OWNERS Clean up infra owners 2019-05-15 11:18:43 +00:00
INTL_OWNERS Add missing owners files 2019-05-31 07:21:01 +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
LICENSE.valgrind Add LICENSE.v8, LICENSE.strongtalk and LICENSE.valgrind to the v8 2011-02-03 07:10:06 +00:00
MIPS_OWNERS Move architecture dependent files 2019-05-28 14:02:15 +00:00
OWNERS Add syg@chromium.org as DEPS owner for test262 rolls 2019-09-17 19:29:11 +00:00
PPC_OWNERS Move architecture dependent files 2019-05-28 14:02:15 +00:00
PRESUBMIT.py Re-check all files on a DEPS change 2019-09-30 09:23:36 +00:00
README.md [docs] Change links from old wiki to v8.dev 2019-03-07 12:13:30 +00:00
S390_OWNERS Move architecture dependent files 2019-05-28 14:02:15 +00:00
WATCHLISTS Remove 'profiler' category from WATCHLISTS 2019-10-21 08:23:59 +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.