On Thu, Jul 25, 2024 at 08:55:20AM +0100, Alan Maguire wrote:
> libbpf returns a negative error code when adding types fails.
> Pass it into btf__log_err() and display the libbpf error when
> negative. Nearly all use cases of btf__log_err() happen as a
> result of a libbpf-returned error, pass 0 for the exceptions.
the more info the better ;-) lgtm
Reviewed-by: Jiri Olsa <jolsa@xxxxxxxxxx>
jirka
>
> Signed-off-by: Alan Maguire <alan.maguire@xxxxxxxxxx>
> ---
> btf_encoder.c | 45 +++++++++++++++++++++++++--------------------
> 1 file changed, 25 insertions(+), 20 deletions(-)
>
> diff --git a/btf_encoder.c b/btf_encoder.c
> index c2df2bc..adc38c3 100644
> --- a/btf_encoder.c
> +++ b/btf_encoder.c
> @@ -237,9 +237,9 @@ static const char * btf__int_encoding_str(uint8_t encoding)
> return "UNKN";
> }
>
> -__attribute ((format (printf, 5, 6)))
> +__attribute ((format (printf, 6, 7)))
> static void btf__log_err(const struct btf *btf, int kind, const char *name,
> - bool output_cr, const char *fmt, ...)
> + bool output_cr, int libbpf_err, const char *fmt, ...)
> {
> fprintf(stderr, "[%u] %s %s", btf__type_cnt(btf),
> btf_kind_str[kind], name ?: "(anon)");
> @@ -253,6 +253,9 @@ static void btf__log_err(const struct btf *btf, int kind, const char *name,
> va_end(ap);
> }
>
> + if (libbpf_err < 0)
> + fprintf(stderr, " (libbpf error %d)", libbpf_err);
> +
> if (output_cr)
> fprintf(stderr, "\n");
> }
> @@ -355,7 +358,8 @@ static int32_t btf_encoder__add_float(struct btf_encoder *encoder, const struct
> int32_t id = btf__add_float(encoder->btf, name, BITS_ROUNDUP_BYTES(bt->bit_size));
>
> if (id < 0) {
> - btf__log_err(encoder->btf, BTF_KIND_FLOAT, name, true, "Error emitting BTF type");
> + btf__log_err(encoder->btf, BTF_KIND_FLOAT, name, true, id,
> + "Error emitting BTF type");
> } else {
> const struct btf_type *t;
>
> @@ -429,7 +433,7 @@ static int32_t btf_encoder__add_base_type(struct btf_encoder *encoder, const str
>
> id = btf__add_int(encoder->btf, name, byte_sz, encoding);
> if (id < 0) {
> - btf__log_err(encoder->btf, BTF_KIND_INT, name, true, "Error emitting BTF type");
> + btf__log_err(encoder->btf, BTF_KIND_INT, name, true, id, "Error emitting BTF type");
> } else {
> t = btf__type_by_id(encoder->btf, id);
> btf_encoder__log_type(encoder, t, false, true, "size=%u nr_bits=%u encoding=%s%s",
> @@ -473,7 +477,7 @@ static int32_t btf_encoder__add_ref_type(struct btf_encoder *encoder, uint16_t k
> id = btf__add_func(btf, name, BTF_FUNC_STATIC, type);
> break;
> default:
> - btf__log_err(btf, kind, name, true, "Unexpected kind for reference");
> + btf__log_err(btf, kind, name, true, 0, "Unexpected kind for reference");
> return -1;
> }
>
> @@ -484,7 +488,7 @@ static int32_t btf_encoder__add_ref_type(struct btf_encoder *encoder, uint16_t k
> else
> btf_encoder__log_type(encoder, t, false, true, "type_id=%u", t->type);
> } else {
> - btf__log_err(btf, kind, name, true, "Error emitting BTF type");
> + btf__log_err(btf, kind, name, true, id, "Error emitting BTF type");
> }
> return id;
> }
> @@ -503,7 +507,7 @@ static int32_t btf_encoder__add_array(struct btf_encoder *encoder, uint32_t type
> btf_encoder__log_type(encoder, t, false, true, "type_id=%u index_type_id=%u nr_elems=%u",
> array->type, array->index_type, array->nelems);
> } else {
> - btf__log_err(btf, BTF_KIND_ARRAY, NULL, true,
> + btf__log_err(btf, BTF_KIND_ARRAY, NULL, true, id,
> "type_id=%u index_type_id=%u nr_elems=%u Error emitting BTF type",
> type, index_type, nelems);
> }
> @@ -545,12 +549,12 @@ static int32_t btf_encoder__add_struct(struct btf_encoder *encoder, uint8_t kind
> id = btf__add_union(btf, name, size);
> break;
> default:
> - btf__log_err(btf, kind, name, true, "Unexpected kind of struct");
> + btf__log_err(btf, kind, name, true, 0, "Unexpected kind of struct");
> return -1;
> }
>
> if (id < 0) {
> - btf__log_err(btf, kind, name, true, "Error emitting BTF type");
> + btf__log_err(btf, kind, name, true, id, "Error emitting BTF type");
> } else {
> t = btf__type_by_id(btf, id);
> btf_encoder__log_type(encoder, t, false, true, "size=%u", t->size);
> @@ -600,7 +604,7 @@ static int32_t btf_encoder__add_enum(struct btf_encoder *encoder, const char *na
> t = btf__type_by_id(btf, id);
> btf_encoder__log_type(encoder, t, false, true, "size=%u", t->size);
> } else {
> - btf__log_err(btf, is_enum32 ? BTF_KIND_ENUM : BTF_KIND_ENUM64, name, true,
> + btf__log_err(btf, is_enum32 ? BTF_KIND_ENUM : BTF_KIND_ENUM64, name, true, id,
> "size=%u Error emitting BTF type", size);
> }
> return id;
> @@ -682,9 +686,9 @@ static int32_t btf_encoder__add_func_proto(struct btf_encoder *encoder, struct f
> t = btf__type_by_id(btf, id);
> btf_encoder__log_type(encoder, t, false, false, "return=%u args=(%s", t->type, !nr_params ? "void)\n" : "");
> } else {
> - btf__log_err(btf, BTF_KIND_FUNC_PROTO, NULL, true,
> - "return=%u vlen=%u Error emitting BTF type",
> - type_id, nr_params);
> + btf__log_err(btf, BTF_KIND_FUNC_PROTO, NULL, true, id,
> + "return=%u vlen=%u Error emitting BTF type",
> + type_id, nr_params);
> return id;
> }
>
> @@ -718,9 +722,9 @@ static int32_t btf_encoder__add_var(struct btf_encoder *encoder, uint32_t type,
> t = btf__type_by_id(btf, id);
> btf_encoder__log_type(encoder, t, false, true, "type=%u linkage=%u", t->type, btf_var(t)->linkage);
> } else {
> - btf__log_err(btf, BTF_KIND_VAR, name, true,
> - "type=%u linkage=%u Error emitting BTF type",
> - type, linkage);
> + btf__log_err(btf, BTF_KIND_VAR, name, true, id,
> + "type=%u linkage=%u Error emitting BTF type",
> + type, linkage);
> }
> return id;
> }
> @@ -781,9 +785,9 @@ static int32_t btf_encoder__add_datasec(struct btf_encoder *encoder, const char
>
> id = btf__add_datasec(btf, section_name, datasec_sz);
> if (id < 0) {
> - btf__log_err(btf, BTF_KIND_DATASEC, section_name, true,
> - "size=%u vlen=%u Error emitting BTF type",
> - datasec_sz, nr_var_secinfo);
> + btf__log_err(btf, BTF_KIND_DATASEC, section_name, true, id,
> + "size=%u vlen=%u Error emitting BTF type",
> + datasec_sz, nr_var_secinfo);
> } else {
> t = btf__type_by_id(btf, id);
> btf_encoder__log_type(encoder, t, false, true, "size=%u vlen=%u", t->size, nr_var_secinfo);
> @@ -819,7 +823,8 @@ static int32_t btf_encoder__add_decl_tag(struct btf_encoder *encoder, const char
> btf_encoder__log_type(encoder, t, false, true, "type_id=%u component_idx=%d",
> t->type, component_idx);
> } else {
> - btf__log_err(btf, BTF_KIND_DECL_TAG, value, true, "component_idx=%d Error emitting BTF type",
> + btf__log_err(btf, BTF_KIND_DECL_TAG, value, true, id,
> + "component_idx=%d Error emitting BTF type",
> component_idx);
> }
>
> --
> 2.43.5
>
