[compiler][modules] Constant-fold loads of module cells.

1. Generalize context specialization such that the provided context
   can be any outer context of the function, not necessarily the
   immediate outer context.

2. Based on this: if function specialization is disabled, then
   specialize for the module context if there is one.

3. Extend typed lowering of module loads and stores such that if
   the operand is a Module constant, we constant-fold the cell load.
   That is, a JSLoadModule with a Module HeapConstant input becomes
   a LoadField with a Cell HeapConstant input, and similarly for
   JSStoreModule.

BUG=v8:1569

Review-Url: https://codereview.chromium.org/2841613002
Cr-Commit-Position: refs/heads/master@{#45083}
8 files changed
tree: b82177dd93f1219dab2635f46844b1764dc431ca
  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. .gitignore
  16. .gn
  17. .ycm_extra_conf.py
  18. AUTHORS
  19. BUILD.gn
  20. ChangeLog
  21. CODE_OF_CONDUCT.md
  22. codereview.settings
  23. DEPS
  24. LICENSE
  25. LICENSE.fdlibm
  26. LICENSE.strongtalk
  27. LICENSE.v8
  28. LICENSE.valgrind
  29. Makefile
  30. Makefile.android
  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.