[parser] Unify and simplify handling of "null" types

Before this patch, the parser mixed mixed "Null" and "Empty" as names
for null placeholder instances in ParserBase. Confusingly, those meant
different things in case of Statements.

This patch uses "Null" anywhere the meaning is "== nullptr" in the Parser.
It also makes use of std::nullptr_t and templatized IsNull() methods to
reduce the amount of boilerplate needed in both the Parser and PreParser.

Change-Id: I1451ba56d1a56466beb7e0c91dcf8e2bb7084413
Reviewed-on: https://chromium-review.googlesource.com/618167
Commit-Queue: Adam Klein <adamk@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47406}
3 files changed
tree: 9b5f9e6d108c05ab14a7f27b7203c0cf77b0584c
  1. benchmarks/
  2. build_overrides/
  3. docs/
  4. gni/
  5. gypfiles/
  6. include/
  7. infra/
  8. samples/
  9. src/
  10. test/
  11. testing/
  12. third_party/
  13. tools/
  14. .clang-format
  15. .editorconfig
  16. .gitignore
  17. .gn
  18. .ycm_extra_conf.py
  19. AUTHORS
  20. BUILD.gn
  21. ChangeLog
  22. CODE_OF_CONDUCT.md
  23. codereview.settings
  24. DEPS
  25. LICENSE
  26. LICENSE.fdlibm
  27. LICENSE.strongtalk
  28. LICENSE.v8
  29. LICENSE.valgrind
  30. Makefile
  31. Makefile.android
  32. OWNERS
  33. PRESUBMIT.py
  34. README.md
  35. snapshot_toolchain.gni
  36. 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.