tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#include <stdio.h>
2#include <stdlib.h>
3#include <string.h>
4#include <unistd.h>
5#include <errno.h>
6#include <linux/err.h>
7#include <btf.h>
8
9#define CHECK(condition, format...) ({ \
10 int __ret = !!(condition); \
11 if (__ret) { \
12 fprintf(stderr, "%s:%d:FAIL ", __func__, __LINE__); \
13 fprintf(stderr, format); \
14 } \
15 __ret; \
16})
17
18void btf_dump_printf(void *ctx, const char *fmt, va_list args)
19{
20 vfprintf(ctx, fmt, args);
21}
22
23struct btf_dump_test_case {
24 const char *name;
25 struct btf_dump_opts opts;
26} btf_dump_test_cases[] = {
27 {.name = "btf_dump_test_case_syntax", .opts = {}},
28 {.name = "btf_dump_test_case_ordering", .opts = {}},
29 {.name = "btf_dump_test_case_padding", .opts = {}},
30 {.name = "btf_dump_test_case_packing", .opts = {}},
31 {.name = "btf_dump_test_case_bitfields", .opts = {}},
32 {.name = "btf_dump_test_case_multidim", .opts = {}},
33 {.name = "btf_dump_test_case_namespacing", .opts = {}},
34};
35
36static int btf_dump_all_types(const struct btf *btf,
37 const struct btf_dump_opts *opts)
38{
39 size_t type_cnt = btf__get_nr_types(btf);
40 struct btf_dump *d;
41 int err = 0, id;
42
43 d = btf_dump__new(btf, NULL, opts, btf_dump_printf);
44 if (IS_ERR(d))
45 return PTR_ERR(d);
46
47 for (id = 1; id <= type_cnt; id++) {
48 err = btf_dump__dump_type(d, id);
49 if (err)
50 goto done;
51 }
52
53done:
54 btf_dump__free(d);
55 return err;
56}
57
58int test_btf_dump_case(int n, struct btf_dump_test_case *test_case)
59{
60 char test_file[256], out_file[256], diff_cmd[1024];
61 struct btf *btf = NULL;
62 int err = 0, fd = -1;
63 FILE *f = NULL;
64
65 fprintf(stderr, "Test case #%d (%s): ", n, test_case->name);
66
67 snprintf(test_file, sizeof(test_file), "%s.o", test_case->name);
68
69 btf = btf__parse_elf(test_file, NULL);
70 if (CHECK(IS_ERR(btf),
71 "failed to load test BTF: %ld\n", PTR_ERR(btf))) {
72 err = -PTR_ERR(btf);
73 btf = NULL;
74 goto done;
75 }
76
77 snprintf(out_file, sizeof(out_file),
78 "/tmp/%s.output.XXXXXX", test_case->name);
79 fd = mkstemp(out_file);
80 if (CHECK(fd < 0, "failed to create temp output file: %d\n", fd)) {
81 err = fd;
82 goto done;
83 }
84 f = fdopen(fd, "w");
85 if (CHECK(f == NULL, "failed to open temp output file: %s(%d)\n",
86 strerror(errno), errno)) {
87 close(fd);
88 goto done;
89 }
90
91 test_case->opts.ctx = f;
92 err = btf_dump_all_types(btf, &test_case->opts);
93 fclose(f);
94 close(fd);
95 if (CHECK(err, "failure during C dumping: %d\n", err)) {
96 goto done;
97 }
98
99 snprintf(test_file, sizeof(test_file), "progs/%s.c", test_case->name);
100 if (access(test_file, R_OK) == -1)
101 /*
102 * When the test is run with O=, kselftest copies TEST_FILES
103 * without preserving the directory structure.
104 */
105 snprintf(test_file, sizeof(test_file), "%s.c",
106 test_case->name);
107 /*
108 * Diff test output and expected test output, contained between
109 * START-EXPECTED-OUTPUT and END-EXPECTED-OUTPUT lines in test case.
110 * For expected output lines, everything before '*' is stripped out.
111 * Also lines containing comment start and comment end markers are
112 * ignored.
113 */
114 snprintf(diff_cmd, sizeof(diff_cmd),
115 "awk '/START-EXPECTED-OUTPUT/{out=1;next} "
116 "/END-EXPECTED-OUTPUT/{out=0} "
117 "/\\/\\*|\\*\\//{next} " /* ignore comment start/end lines */
118 "out {sub(/^[ \\t]*\\*/, \"\"); print}' '%s' | diff -u - '%s'",
119 test_file, out_file);
120 err = system(diff_cmd);
121 if (CHECK(err,
122 "differing test output, output=%s, err=%d, diff cmd:\n%s\n",
123 out_file, err, diff_cmd))
124 goto done;
125
126 remove(out_file);
127 fprintf(stderr, "OK\n");
128
129done:
130 btf__free(btf);
131 return err;
132}
133
134int main() {
135 int test_case_cnt, i, err, failed = 0;
136
137 test_case_cnt = sizeof(btf_dump_test_cases) /
138 sizeof(btf_dump_test_cases[0]);
139
140 for (i = 0; i < test_case_cnt; i++) {
141 err = test_btf_dump_case(i, &btf_dump_test_cases[i]);
142 if (err)
143 failed++;
144 }
145
146 fprintf(stderr, "%d tests succeeded, %d tests failed.\n",
147 test_case_cnt - failed, failed);
148
149 return failed;
150}