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btf: expose get_btf_id

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Expose the function get_btf_id, so that it may be used by the BPF
backend. This enables the BPF CO-RE machinery in the BPF backend to
lookup BTF type IDs, in order to create CO-RE relocation records.

A prototype is added in ctfc.h

gcc/ChangeLog:

	* btfout.c (get_btf_id): Function is no longer static.
	* ctfc.h: Expose it here.
This commit is contained in:
David Faust 2021-08-03 10:04:10 -07:00
parent 5b723401b3
commit 0a2bd52f1a
2 changed files with 2 additions and 1 deletions
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2
gcc/btfout.c
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@ -156,7 +156,7 @@ init_btf_id_map (size_t len)
/* Return the BTF type ID of CTF type ID KEY, or BTF_INVALID_TYPEID if the CTF
type with ID KEY does not map to a BTF type. */
static inline ctf_id_t
ctf_id_t
get_btf_id (ctf_id_t key)
{
return btf_id_map[key];

1
gcc/ctfc.h
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@ -431,6 +431,7 @@ extern int ctf_add_variable (ctf_container_ref, const char *, ctf_id_t,
dw_die_ref, unsigned int);
extern ctf_id_t ctf_lookup_tree_type (ctf_container_ref, const tree);
extern ctf_id_t get_btf_id (ctf_id_t);
/* CTF section does not emit location information; at this time, location
information is needed for BTF CO-RE use-cases. */