[PATCH] D93563: BPF: add extern func to data sections if specified

[Yonghong Song via Phabricator via llvm-commits]

yonghong-song created this revision.
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This permits BTF_KIND_FUNC style extern var to be added to
BTF_KIND_DATASEC if specific section name is specified.
For example,

  -bash-4.4$ cat t.c 
  void foo(int) __attribute__((section(".kernel.funcs")));
  int test(void) {
    foo(5);
    return 0;
  }

A variable (BTF_KIND_VAR) will generated for extern func foo,
and this variable will be put into BTF_KIND_DATASEC with name
".kernel.funcs".

This will help to differentiate two kinds of external functions,
functions in kernel and functions defined in other bpf programs.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D93563

Files:
  llvm/lib/Target/BPF/BTFDebug.cpp
  llvm/test/CodeGen/BPF/BTF/extern-var-func-weak-section.ll
  llvm/test/CodeGen/BPF/BTF/extern-var-section.ll
  llvm/test/CodeGen/BPF/BTF/extern-var-weak-section.ll

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