Merged: [arm64] Remove x18 from allocatable registers

The arm64 ABI defines x18 as a platform register, and as such
platforms may reserve it for their own purposes.

This CL unconditionally removes x18 from the allocatable register list
(previously it was only excluded from arm64 Windows). If, for some
reason, we want to keep x18 allocatable on some platforms, we can
explicitly enable it for specific platforms in the future.

Tbr: hablich@chromium.org
No-Try: true
No-Presubmit: true
No-Treechecks: true
Bug: v8:8940,v8:9140
Change-Id: I28c4f6aad714e21a0a54bab6041c13a1b28fd467
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564194
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#60870}(cherry picked from commit 9e9def0631cc5e0fe9f097acf46758dc035038ca)
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1571617
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/branch-heads/7.4@{#47}
Cr-Branched-From: 3e8a733af17a7812eba188dad612be503bd45c57-refs/heads/7.4.288@{#1}
Cr-Branched-From: d077f9b5ad92b23fe4366a9bdce319a71cd1a2c5-refs/heads/master@{#60039}
6 files changed
tree: 825f202e0f1d5c5ab1f35fe0a18d26c0c8e6cde7
  1. .clang-format
  2. .clang-tidy
  3. .editorconfig
  4. .git-blame-ignore-revs
  5. .gitattributes
  6. .gitignore
  7. .gn
  8. .vpython
  9. .ycm_extra_conf.py
  10. AUTHORS
  11. BUILD.gn
  12. CODE_OF_CONDUCT.md
  13. ChangeLog
  14. DEPS
  15. LICENSE
  16. LICENSE.fdlibm
  17. LICENSE.strongtalk
  18. LICENSE.v8
  19. LICENSE.valgrind
  20. OWNERS
  21. PRESUBMIT.py
  22. README.md
  23. WATCHLISTS
  24. benchmarks/
  25. build_overrides/
  26. codereview.settings
  27. custom_deps/
  28. docs/
  29. gni/
  30. include/
  31. infra/
  32. samples/
  33. snapshot_toolchain.gni
  34. src/
  35. test/
  36. testing/
  37. third_party/
  38. 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.