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bpftool: add C output format option to btf dump subcommand

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Utilize new libbpf's btf_dump API to emit BTF as a C definitions.

Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko 2019-05-24 11:59:05 -07:00 committed by Alexei Starovoitov
parent 2d2a3ad872
commit 2119f2189d
1 changed files with 73 additions and 2 deletions
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75
tools/bpf/bpftool/btf.c
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@ -340,11 +340,49 @@ static int dump_btf_raw(const struct btf *btf,
return 0;
}
static void __printf(2, 0) btf_dump_printf(void *ctx,
const char *fmt, va_list args)
{
vfprintf(stdout, fmt, args);
}
static int dump_btf_c(const struct btf *btf,
__u32 *root_type_ids, int root_type_cnt)
{
struct btf_dump *d;
int err = 0, i;
d = btf_dump__new(btf, NULL, NULL, btf_dump_printf);
if (IS_ERR(d))
return PTR_ERR(d);
if (root_type_cnt) {
for (i = 0; i < root_type_cnt; i++) {
err = btf_dump__dump_type(d, root_type_ids[i]);
if (err)
goto done;
}
} else {
int cnt = btf__get_nr_types(btf);
for (i = 1; i <= cnt; i++) {
err = btf_dump__dump_type(d, i);
if (err)
goto done;
}
}
done:
btf_dump__free(d);
return err;
}
static int do_dump(int argc, char **argv)
{
struct btf *btf = NULL;
__u32 root_type_ids[2];
int root_type_cnt = 0;
bool dump_c = false;
__u32 btf_id = -1;
const char *src;
int fd = -1;
@ -431,6 +469,29 @@ static int do_dump(int argc, char **argv)
goto done;
}
while (argc) {
if (is_prefix(*argv, "format")) {
NEXT_ARG();
if (argc < 1) {
p_err("expecting value for 'format' option\n");
goto done;
}
if (strcmp(*argv, "c") == 0) {
dump_c = true;
} else if (strcmp(*argv, "raw") == 0) {
dump_c = false;
} else {
p_err("unrecognized format specifier: '%s', possible values: raw, c",
*argv);
goto done;
}
NEXT_ARG();
} else {
p_err("unrecognized option: '%s'", *argv);
goto done;
}
}
if (!btf) {
err = btf__get_from_id(btf_id, &btf);
if (err) {
@ -444,7 +505,16 @@ static int do_dump(int argc, char **argv)
}
}
dump_btf_raw(btf, root_type_ids, root_type_cnt);
if (dump_c) {
if (json_output) {
p_err("JSON output for C-syntax dump is not supported");
err = -ENOTSUP;
goto done;
}
err = dump_btf_c(btf, root_type_ids, root_type_cnt);
} else {
err = dump_btf_raw(btf, root_type_ids, root_type_cnt);
}
done:
close(fd);
@ -460,10 +530,11 @@ static int do_help(int argc, char **argv)
}
fprintf(stderr,
"Usage: %s btf dump BTF_SRC\n"
"Usage: %s btf dump BTF_SRC [format FORMAT]\n"
" %s btf help\n"
"\n"
" BTF_SRC := { id BTF_ID | prog PROG | map MAP [{key | value | kv | all}] | file FILE }\n"
" FORMAT := { raw | c }\n"
" " HELP_SPEC_MAP "\n"
" " HELP_SPEC_PROGRAM "\n"
" " HELP_SPEC_OPTIONS "\n"