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Support the btf_decl_tag and btf_type_tag attributes in BTF by creating and emitting BTF_KIND_DECL_TAG and BTF_KIND_TYPE_TAG records, respectively, for them. Some care is required when -gprune-btf is in effect to avoid emitting decl or type tags for declarations or types which have been pruned and will not be emitted in BTF. gcc/ * btfout.cc (get_btf_kind): Handle DECL_TAG and TYPE_TAG kinds. (btf_calc_num_vbytes): Likewise. (btf_asm_type): Likewise. (output_asm_btf_vlen_bytes): Likewise. (output_btf_tags): New. (btf_output): Call it here. (btf_add_used_type): Replace with simple wrapper around... (btf_add_used_type_1): ...the implementation. Handle BTF_KIND_DECL_TAG and BTF_KIND_TYPE_TAG. (btf_add_vars): Update btf_add_used_type call. (btf_assign_tag_ids): New. (btf_mark_type_used): Update btf_add_used_type call. (btf_collect_pruned_types): Likewise. Handle type and decl tags. (btf_finish): Call btf_assign_tag_ids. gcc/testsuite/ * gcc.dg/debug/btf/btf-decl-tag-1.c: New test. * gcc.dg/debug/btf/btf-decl-tag-2.c: New test. * gcc.dg/debug/btf/btf-decl-tag-3.c: New test. * gcc.dg/debug/btf/btf-decl-tag-4.c: New test. * gcc.dg/debug/btf/btf-type-tag-1.c: New test. * gcc.dg/debug/btf/btf-type-tag-2.c: New test. * gcc.dg/debug/btf/btf-type-tag-3.c: New test. * gcc.dg/debug/btf/btf-type-tag-4.c: New test. * gcc.dg/debug/btf/btf-type-tag-c2x-1.c: New test. include/ * btf.h (BTF_KIND_DECL_TAG, BTF_KIND_TYPE_TAG) New defines. (struct btf_decl_tag): New.
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