[PATCH] D113222: BPF: Support btf_type_tag attribute

[Yonghong Song via Phabricator via llvm-commits]

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A new kind BTF_KIND_TYPE_TAG is defined. The tags associated
with a pointer type are emitted in their IR order as modifiers.
For example, for the following declaration:

  int __tag1 * __tag1 __tag2 *g; 

The BTF type chain will look like

  VAR(g) -> __tag1 --> __tag2 -> pointer -> __tag1 -> pointer -> int 

In the above "->" means BTF CommonType.Type which indicates
the point-to type.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D113222

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/type-tag-var.ll

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