[all-commits] [llvm/llvm-project] edc838: [LLVM] Add file magic detection for SPIR-V files. ...

[Joseph Huber via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: edc83886d479e110c87d104e7241ce67ee1b6316
      https://github.com/llvm/llvm-project/commit/edc83886d479e110c87d104e7241ce67ee1b6316
  Author: Joseph Huber <huberjn at outlook.com>
  Date:   2023-12-13 (Wed, 13 Dec 2023)

  Changed paths:
    M llvm/include/llvm/BinaryFormat/Magic.h
    M llvm/lib/BinaryFormat/Magic.cpp
    M llvm/lib/Object/Binary.cpp
    M llvm/lib/Object/ObjectFile.cpp
    M llvm/unittests/BinaryFormat/TestFileMagic.cpp

  Log Message:
  -----------
  [LLVM] Add file magic detection for SPIR-V files. (#75363)

Summary:
More SPIR-V related patches are being upstreamed. We should add support
to detect when a binary file is SPIR-V. This will be used in the future
when support for SPIR-V is added to the offloading runtime or more
support for bundling.

The magic number is described in the official documentation:
https://registry.khronos.org/SPIR-V/specs/1.0/SPIRV.html#Magic. Notably,
SPIR-V files are streams of 32-bit words. This means that the magic
numbers differ depending on the endianness. Here we simply check the
strandard and byte-reversed versions.