Reland "[snapshot] Align internal snapshot data"

This is a reland of 4f9d7a94a11a8b222e565f1e61b332d570cb0a5e

Original change's description:
> [snapshot] Align internal snapshot data
>
> When the snapshot blob is not aligned properly, loading it can cause a
> crash on platforms such as arm.
>
> This was exposed by a SIGBUS/BUS_ADRALN crash on arm when accessing
> the blob_data symbol (declared as a byte array) through a reinterpret
> cast to uintptr_t in an internal snapshot build.
>
> Thanks to florian.dold@gmail.com for the initial patch.
>
> Bug: v8:9171
> Change-Id: I99b071dec3733416f2f01b58a770e30d8f2dcdf2
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1582402
> Commit-Queue: Dan Elphick <delphick@chromium.org>
> Auto-Submit: Jakob Gruber <jgruber@chromium.org>
> Reviewed-by: Dan Elphick <delphick@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#61000}

Tbr: delphick@chromium.org
Bug: v8:9171
Change-Id: I36f53647ff5c45bcc512147f082fdd069723175d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1587377
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61062}
2 files changed
tree: 4649858763321f3402319ca65c8da0140c0722ad
  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://v8.dev/docs

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 at v8.dev/docs/contribute.