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libctf, create, types: encoding, BTF floats

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This adds support for the nearly useless BTF_KIND_FLOAT, under the name
CTF_K_BTF_FLOAT.  At the same time we fix up the ctf_add_encoding and
ctf_type_encoding machinery for the new API changes.

I expect this to change a bit: Ali Bahrami reckons I've oversimplified the
CTFv4 encoding representation and need to reintroduce at least a width.

New API:

ctf_id_t ctf_add_btf_float (ctf_dict_t *, uint32_t,
                            const char *, const ctf_encoding_t *);
This commit is contained in:
Nick Alcock
2025-04-24 17:28:34 +01:00
parent 03609073b0
commit 2c1a0a70d1
4 changed files with 46 additions and 36 deletions
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50
libctf/ctf-create.c
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@@ -668,32 +668,29 @@ ctf_add_encoded (ctf_dict_t *fp, uint32_t flag,
if (name == NULL || name[0] == '\0')
return (ctf_set_typed_errno (fp, ECTF_NONAME));
if (!ctf_assert (fp, kind == CTF_K_INTEGER || kind == CTF_K_FLOAT))
return CTF_ERR; /* errno is set for us. */
if (!ctf_assert (fp, kind == CTF_K_INTEGER || kind == CTF_K_FLOAT
|| kind == CTF_K_BTF_FLOAT))
return CTF_ERR; /* errno is set for us. */
if ((type = ctf_add_generic (fp, flag, name, kind, sizeof (uint32_t),
&dtd)) == CTF_ERR)
if (kind == CTF_K_BTF_FLOAT)
vlen = 0;
if ((dtd = ctf_add_generic (fp, flag, name, kind, 0, vlen, 0, NULL)) == NULL)
return CTF_ERR; /* errno is set for us. */
dtd->dtd_data.ctt_info = CTF_TYPE_INFO (kind, flag, 0);
dtd->dtd_data.ctt_size = clp2 (P2ROUNDUP (ep->cte_bits, CHAR_BIT)
/ CHAR_BIT);
switch (kind)
{
case CTF_K_INTEGER:
encoding = CTF_INT_DATA (ep->cte_format, ep->cte_offset, ep->cte_bits);
break;
case CTF_K_FLOAT:
encoding = CTF_FP_DATA (ep->cte_format, ep->cte_offset, ep->cte_bits);
break;
default:
/* ctf_assert is opaque with -fno-inline. This dead code avoids
a warning about "encoding" being used uninitialized. */
return CTF_ERR;
}
memcpy (dtd->dtd_vlen, &encoding, sizeof (encoding));
dtd->dtd_data->ctt_info = CTF_TYPE_INFO (kind, 0, 0);
dtd->dtd_data->ctt_size = clp2 (P2ROUNDUP (ep->cte_bits, CHAR_BIT) / CHAR_BIT);
return type;
if (kind != CTF_K_BTF_FLOAT)
{
encoding = ep->cte_format;
if (kind == CTF_K_INTEGER)
encoding = CTF_INT_DATA (ep->cte_format, ep->cte_offset, ep->cte_bits);
memcpy (dtd->dtd_vlen, &encoding, sizeof (encoding));
}
return dtd->dtd_type;
}
ctf_id_t
@@ -770,7 +767,7 @@ ctf_add_slice (ctf_dict_t *fp, uint32_t flag, ctf_id_t ref,
kind = ctf_type_kind_unsliced (fp, resolved_ref);
if ((kind != CTF_K_INTEGER) && (kind != CTF_K_FLOAT) &&
(kind != CTF_K_ENUM)
(kind != CTF_K_ENUM) && (kind != CTF_K_BTF_FLOAT)
&& (ref != 0))
return (ctf_set_typed_errno (fp, ECTF_NOTINTFP));
@@ -805,6 +802,13 @@ ctf_add_float (ctf_dict_t *fp, uint32_t flag,
return (ctf_add_encoded (fp, flag, name, ep, CTF_K_FLOAT));
}
ctf_id_t
ctf_add_btf_float (ctf_dict_t *fp, uint32_t flag,
const char *name, const ctf_encoding_t *ep)
{
return (ctf_add_encoded (fp, flag, name, ep, CTF_K_BTF_FLOAT));
}
ctf_id_t
ctf_add_pointer (ctf_dict_t *fp, uint32_t flag, ctf_id_t ref)
{