David Faust 43dcea48b8 btf: generate and output DECL_TAG and TYPE_TAG records ...

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.

2025-10-09 14:13:23 -07:00

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