[builtins] Generalize the constant lookup mechanism

Moves the decision whether to embed the constant or perform a lookup
through the builtins constants table to
CodeAssembler::UntypedHeapConstant.

Root constants continue to be embedded (and are later turned into
loads through root-register by the backend); non-root constants are
added to the constants table at generation-time and loaded from there
at runtime.

This allows us to remove the recently added boilerplate around
CallStub and CallRuntime in a follow-up.

Bug: v8:6666
Change-Id: Id981088e4b9d665c678acc9718383179f681f063
Reviewed-on: https://chromium-review.googlesource.com/931122
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51495}
5 files changed
tree: a2edffe5bc07c18fd8a0489a62b8b60917212643
  1. .clang-format
  2. .editorconfig
  3. .git-blame-ignore-revs
  4. .gitignore
  5. .gn
  6. .vpython
  7. .ycm_extra_conf.py
  8. AUTHORS
  9. BUILD.gn
  10. CODE_OF_CONDUCT.md
  11. ChangeLog
  12. DEPS
  13. LICENSE
  14. LICENSE.fdlibm
  15. LICENSE.strongtalk
  16. LICENSE.v8
  17. LICENSE.valgrind
  18. OWNERS
  19. PRESUBMIT.py
  20. README.md
  21. WATCHLISTS
  22. benchmarks/
  23. build_overrides/
  24. codereview.settings
  25. docs/
  26. gni/
  27. include/
  28. infra/
  29. samples/
  30. snapshot_toolchain.gni
  31. src/
  32. test/
  33. testing/
  34. third_party/
  35. tools/
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.