[PATCH] D106622: [BPF] support btf_tag attribute in .BTF section

[Yonghong Song via Phabricator via llvm-commits]

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A new kind BTF_KIND_TAG is added to .BTF to encode
btf_tag attributes. The format looks like

  CommonType.name : attribute string
  CommonType.type : attached to a struct/union/func/func_proto/var.
  CommonType.info : encoding BTF_KIND_TAG
                    kflag bit to indicate the attribute is
                    for CommonType.type, or for struct/union member
                    or func_proto argument.
  one uint32_t    : to encode which member/argument starting from 0.

If one particular type or member/argument has more than one attribute,
multiple BTF_KIND_TAG will be generated.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D106622

Files:
  llvm/lib/Target/BPF/BTF.def
  llvm/lib/Target/BPF/BTF.h
  llvm/lib/Target/BPF/BTFDebug.cpp
  llvm/lib/Target/BPF/BTFDebug.h
  llvm/test/CodeGen/BPF/BTF/tag-1.ll
  llvm/test/CodeGen/BPF/BTF/tag-2.ll

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