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Ulan Degenbaev 8024204828 [api] New v8::Isolate::MeasureMemory API with per-context sizes 
This adds a new API function that can be customized by the embedder
by providing a delegate that defines contexts to be measured and
reports the results to JS.

A memory measurement request is carried out as follows:

1) MeasureMemory(delegate) invocation enqueues a new request in
   MemoryMeasurement::received_ and schedules a delayed GC task.

2) At the start of the next GC (that is triggered either by the
   GC schedule or by the delayed task) each request in received_
   moves to processing_. Per-context marking worklists are created
   for each native context that was selected by the delegates
   (using the ShouldMeasure predicate).

3) At the end of the GC the sizes of the native contexts are
   recorded for each request in processing_. The requests move
   to the done_ list and result reporting task is scheduled.

4) When the result reporting task runs it invokes the
   MeasurementComplete function of each delegate in done_.


Bug: chromium:973627

Change-Id: I0254cae693c5b8fab7c85a9eca0a3a128210b6c4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1981493
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65856}
2020-01-19 16:43:57 +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 [heap-profiler] Expose 'globalObjectsAsRoots' via inspector interface 2019-12-18 10:18:58 +00:00
include [api] New v8::Isolate::MeasureMemory API with per-context sizes 2020-01-19 16:43:57 +00:00
infra [ptr-compr][arm64] Enable disabled liftoff tests 2020-01-17 22:04:12 +00:00
samples [cleanup] Drop some occurrences of Isolate::Current 2019-06-26 19:39:21 +00:00
src [api] New v8::Isolate::MeasureMemory API with per-context sizes 2020-01-19 16:43:57 +00:00
test [api] New v8::Isolate::MeasureMemory API with per-context sizes 2020-01-19 16:43:57 +00:00
testing Use relative paths to OWNERS files 2019-08-12 13:52:52 +00:00
third_party [DevTools] Roll third_party/inspector_protocol (v8) 2020-01-17 22:22:08 +00:00
tools [api] New v8::Isolate::MeasureMemory API with per-context sizes 2020-01-19 16:43:57 +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 [git] Ignore jit-*.dump files 2020-01-07 12:14:15 +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 Fix ycm config for headers without source 2019-12-09 11:59:21 +00:00
AUTHORS [parser] add support for BigInt literal as property names 2020-01-13 10:51:45 +00:00
BUILD.gn [wasm] Remove disassembly support 2020-01-17 10:05:28 +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 [OWNERS] Add dinfuehr@ to COMMON_OWNERS 2020-01-10 14:42:32 +00:00
DEPS Update V8 DEPS. 2020-01-16 04:02:51 +00:00
ENG_REVIEW_OWNERS Add eng review owners as escalation path 2019-05-15 19:12:10 +00:00
INFRA_OWNERS Remove myself from owners 2019-12-12 14:22:32 +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 Remove and update some outdated TODO(mstarzinger). 2019-12-13 10:18:04 +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 myself from WATCHLISTS 2020-01-18 00:34:32 +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.