Reland "Extract JSObject class from objects.cc"

This is a reland of b8c821f4e276855e3c62d14d1e04263b562300d3

Fix: include src/string-stream.h for compile failure
https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8%20Linux%20-%20builder/39320

Original change's description:
> Extract JSObject class from objects.cc
>
> I extracted following class member functions to js-objects.cc
> * JSReceiver
> * JSObject
> * JSBoundFunction
> * JSFunction
> * JSGlobalObject
> * JSDate
> * JSMessageObject
>
> Declaration of all above class are in js-objects.h.
>
> I also moved AllocationSite::DigestTransitionFeedback used in JSObject::UpdateAllocationSite
> and ShouldConvertToSlowElements used in JSObject and JSArray
>
> This patch makes compile time of objects.cc from 17.6s to 14.1s on Z840 Linux.
> And js-objects.cc takes 8.69s for compile.
>
> Bug: v8:7629
> Change-Id: I989f22363667445dd28d7f8c06c81ff79d6ed45f
> Reviewed-on: https://chromium-review.googlesource.com/c/1447916
> Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> Reviewed-by: Marja Hölttä <marja@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#59288}

Bug: v8:7629
Bug: v8:8562
Change-Id: Iac2227c5f0c5a4072d16814ecae481fb4720e4f5
Reviewed-on: https://chromium-review.googlesource.com/c/1449951
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59318}
5 files changed
tree: f8d0449e980662d8de9d8bab0a3e23bba796e672
  1. benchmarks/
  2. build_overrides/
  3. custom_deps/
  4. docs/
  5. gni/
  6. include/
  7. infra/
  8. samples/
  9. src/
  10. test/
  11. testing/
  12. third_party/
  13. tools/
  14. .clang-format
  15. .clang-tidy
  16. .editorconfig
  17. .git-blame-ignore-revs
  18. .gitattributes
  19. .gitignore
  20. .gn
  21. .vpython
  22. .ycm_extra_conf.py
  23. AUTHORS
  24. BUILD.gn
  25. ChangeLog
  26. CODE_OF_CONDUCT.md
  27. codereview.settings
  28. DEPS
  29. LICENSE
  30. LICENSE.fdlibm
  31. LICENSE.strongtalk
  32. LICENSE.v8
  33. LICENSE.valgrind
  34. OWNERS
  35. PRESUBMIT.py
  36. README.md
  37. snapshot_toolchain.gni
  38. 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.