[PATCH] D143967: [DebugInfo][BPF] Add 'btf:type_tag' annotation in DWARF

Tue May 2 09:23:44 PDT 2023

yonghong-song added a comment.

I see the following in the Summary:

  Type tag for CVR modifier type

  C:

  volatile int __attribute__((btf_type_tag("__b"))) b;

  DWARF:

  0x31:   DW_TAG_variable
            DW_AT_name      ("b")
            DW_AT_type      (0x3c "volatile int")

  0x3c:   DW_TAG_volatile_type
            DW_AT_type      (0x45 "int")

  0x41:     DW_TAG_LLVM_annotation
              DW_AT_name    ("btf:type_tag")
              DW_AT_const_value     ("__b")

Basically, the btf_type_tag is put under 'volatile' type in dwarf. Is this what gcc also agrees with?

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D143967/new/

https://reviews.llvm.org/D143967