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// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include <bpf/btf.h>
static int duration = 0;
void btf_dump_printf(void *ctx, const char *fmt, va_list args)
{
vfprintf(ctx, fmt, args);
}
static struct btf_dump_test_case {
const char *name;
const char *file;
struct btf_dump_opts opts;
} btf_dump_test_cases[] = {
{"btf_dump: syntax", "btf_dump_test_case_syntax", {}},
{"btf_dump: ordering", "btf_dump_test_case_ordering", {}},
{"btf_dump: padding", "btf_dump_test_case_padding", {}},
{"btf_dump: packing", "btf_dump_test_case_packing", {}},
{"btf_dump: bitfields", "btf_dump_test_case_bitfields", {}},
{"btf_dump: multidim", "btf_dump_test_case_multidim", {}},
{"btf_dump: namespacing", "btf_dump_test_case_namespacing", {}},
};
static int btf_dump_all_types(const struct btf *btf,
const struct btf_dump_opts *opts)
{
size_t type_cnt = btf__get_nr_types(btf);
struct btf_dump *d;
int err = 0, id;
d = btf_dump__new(btf, NULL, opts, btf_dump_printf);
if (IS_ERR(d))
return PTR_ERR(d);
for (id = 1; id <= type_cnt; id++) {
err = btf_dump__dump_type(d, id);
if (err)
goto done;
}
done:
btf_dump__free(d);
return err;
}
static int test_btf_dump_case(int n, struct btf_dump_test_case *t)
{
char test_file[256], out_file[256], diff_cmd[1024];
struct btf *btf = NULL;
int err = 0, fd = -1;
FILE *f = NULL;
snprintf(test_file, sizeof(test_file), "%s.o", t->file);
btf = btf__parse_elf(test_file, NULL);
if (CHECK(IS_ERR(btf), "btf_parse_elf",
"failed to load test BTF: %ld\n", PTR_ERR(btf))) {
err = -PTR_ERR(btf);
btf = NULL;
goto done;
}
snprintf(out_file, sizeof(out_file), "/tmp/%s.output.XXXXXX", t->file);
fd = mkstemp(out_file);
if (CHECK(fd < 0, "create_tmp", "failed to create file: %d\n", fd)) {
err = fd;
goto done;
}
f = fdopen(fd, "w");
if (CHECK(f == NULL, "open_tmp", "failed to open file: %s(%d)\n",
strerror(errno), errno)) {
close(fd);
goto done;
}
t->opts.ctx = f;
err = btf_dump_all_types(btf, &t->opts);
fclose(f);
close(fd);
if (CHECK(err, "btf_dump", "failure during C dumping: %d\n", err)) {
goto done;
}
snprintf(test_file, sizeof(test_file), "progs/%s.c", t->file);
if (access(test_file, R_OK) == -1)
/*
* When the test is run with O=, kselftest copies TEST_FILES
* without preserving the directory structure.
*/
snprintf(test_file, sizeof(test_file), "%s.c", t->file);
/*
* Diff test output and expected test output, contained between
* START-EXPECTED-OUTPUT and END-EXPECTED-OUTPUT lines in test case.
* For expected output lines, everything before '*' is stripped out.
* Also lines containing comment start and comment end markers are
* ignored.
*/
snprintf(diff_cmd, sizeof(diff_cmd),
"awk '/START-EXPECTED-OUTPUT/{out=1;next} "
"/END-EXPECTED-OUTPUT/{out=0} "
"/\\/\\*|\\*\\//{next} " /* ignore comment start/end lines */
"out {sub(/^[ \\t]*\\*/, \"\"); print}' '%s' | diff -u - '%s'",
test_file, out_file);
err = system(diff_cmd);
if (CHECK(err, "diff",
"differing test output, output=%s, err=%d, diff cmd:\n%s\n",
out_file, err, diff_cmd))
goto done;
remove(out_file);
done:
btf__free(btf);
return err;
}
void test_btf_dump() {
int i;
for (i = 0; i < ARRAY_SIZE(btf_dump_test_cases); i++) {
struct btf_dump_test_case *t = &btf_dump_test_cases[i];
if (!test__start_subtest(t->name))
continue;
test_btf_dump_case(i, &btf_dump_test_cases[i]);
}
}
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