[turbofan] Load elimination: do not kill may-alias node maps on map checks.

Instead we only change the map for the node being checked.

This also changes AbstractMaps to look through renames for keys. That
might theoretically lead to seeing less precise types for MayAlias
tests, the hope is it does not matter much.

Bug: v8:6396
Change-Id: I28a067080a3bc58c62a9dd5a76dce1aa348d8e0c
Reviewed-on: https://chromium-review.googlesource.com/730705
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48785}
2 files changed
tree: 00c722ddf8e69c4cab2dcd0f7c99f68909a9c9b0
  1. .clang-format
  2. .editorconfig
  3. .git-blame-ignore-revs
  4. .gitignore
  5. .gn
  6. .ycm_extra_conf.py
  8. BUILD.gn
  10. ChangeLog
  11. DEPS
  13. LICENSE.fdlibm
  14. LICENSE.strongtalk
  15. LICENSE.v8
  16. LICENSE.valgrind
  17. Makefile
  18. Makefile.android
  19. OWNERS
  20. PRESUBMIT.py
  21. README.md
  23. benchmarks/
  24. build_overrides/
  25. codereview.settings
  26. docs/
  27. gni/
  28. gypfiles/
  29. include/
  30. infra/
  31. samples/
  32. snapshot_toolchain.gni
  33. src/
  34. test/
  35. testing/
  36. third_party/
  37. tools/

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/*


Please follow the instructions mentioned on the V8 wiki.