[builtins] Implement Array.from in CodeStubAssembler

This removes the Javascript version of Array.from in js/array.js and
adds a CodeStubAssembler version in src/builtins/builtins-array-gen.cc.

Also modify IteratorBuiltinsAssembler to allow querying the existence
of the iterator method without calling it so we can fall back to the
array-like behavior.

BUG=v8:1956

Change-Id: Ibfb3cef002d72d70bd30b4de676fd22becde006c
Reviewed-on: https://chromium-review.googlesource.com/887066
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51208}
8 files changed
tree: b03dd05570eb839c29a349333f2afb3ce64765b2
  1. benchmarks/
  2. build_overrides/
  3. docs/
  4. gni/
  5. include/
  6. infra/
  7. samples/
  8. src/
  9. test/
  10. testing/
  11. third_party/
  12. tools/
  13. .clang-format
  14. .editorconfig
  15. .git-blame-ignore-revs
  16. .gitignore
  17. .gn
  18. .vpython
  19. .ycm_extra_conf.py
  20. AUTHORS
  21. BUILD.gn
  22. ChangeLog
  23. CODE_OF_CONDUCT.md
  24. codereview.settings
  25. DEPS
  26. LICENSE
  27. LICENSE.fdlibm
  28. LICENSE.strongtalk
  29. LICENSE.v8
  30. LICENSE.valgrind
  31. OWNERS
  32. PRESUBMIT.py
  33. README.md
  34. snapshot_toolchain.gni
  35. WATCHLISTS
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://github.com/v8/v8/wiki

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 on the V8 wiki.