[PATCH] D83878: BPF: support CORE existence checking for typedef and struct variables

[Yonghong Song via Phabricator via llvm-commits]

yonghong-song created this revision.
yonghong-song added reviewers: ast, anakryiko.
yonghong-song added a project: LLVM.
Herald added subscribers: llvm-commits, hiraditya.

This patch added support to generate correct relocation
for existence relocation of typedef and struct/union expressions.
It is able to generate a relocation for following type
and expressions:

  typedef int (*foo_t)(void);
  struct s { int a; ... };
  ...__builtin_preserve_field_info((foo_t)0, 2)...
  ...__builtin_preserve_field_info(*(struct s *)0, 2)...

This will make bpf program easier to deal with multiple kernel versions.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D83878

Files:
  llvm/lib/Target/BPF/BPFAbstractMemberAccess.cpp
  llvm/test/CodeGen/BPF/CORE/intrinsic-fieldinfo-existence-4.ll
  llvm/test/CodeGen/BPF/CORE/intrinsic-fieldinfo-existence-5.ll

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