1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
|
// 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;
bool known_ptr_sz;
struct btf_dump_opts opts;
} btf_dump_test_cases[] = {
{"btf_dump: syntax", "btf_dump_test_case_syntax", true, {}},
{"btf_dump: ordering", "btf_dump_test_case_ordering", false, {}},
{"btf_dump: padding", "btf_dump_test_case_padding", true, {}},
{"btf_dump: packing", "btf_dump_test_case_packing", true, {}},
{"btf_dump: bitfields", "btf_dump_test_case_bitfields", true, {}},
{"btf_dump: multidim", "btf_dump_test_case_multidim", false, {}},
{"btf_dump: namespacing", "btf_dump_test_case_namespacing", false, {}},
};
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;
}
/* tests with t->known_ptr_sz have no "long" or "unsigned long" type,
* so it's impossible to determine correct pointer size; but if they
* do, it should be 8 regardless of host architecture, becaues BPF
* target is always 64-bit
*/
if (!t->known_ptr_sz) {
btf__set_pointer_size(btf, 8);
} else {
CHECK(btf__pointer_size(btf) != 8, "ptr_sz", "exp %d, got %zu\n",
8, btf__pointer_size(btf));
}
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;
}
static char *dump_buf;
static size_t dump_buf_sz;
static FILE *dump_buf_file;
void test_btf_dump_incremental(void)
{
struct btf *btf = NULL;
struct btf_dump *d = NULL;
struct btf_dump_opts opts;
int id, err, i;
dump_buf_file = open_memstream(&dump_buf, &dump_buf_sz);
if (!ASSERT_OK_PTR(dump_buf_file, "dump_memstream"))
return;
btf = btf__new_empty();
if (!ASSERT_OK_PTR(btf, "new_empty"))
goto err_out;
opts.ctx = dump_buf_file;
d = btf_dump__new(btf, NULL, &opts, btf_dump_printf);
if (!ASSERT_OK(libbpf_get_error(d), "btf_dump__new"))
goto err_out;
/* First, generate BTF corresponding to the following C code:
*
* enum { VAL = 1 };
*
* struct s { int x; };
*
*/
id = btf__add_enum(btf, NULL, 4);
ASSERT_EQ(id, 1, "enum_id");
err = btf__add_enum_value(btf, "VAL", 1);
ASSERT_OK(err, "enum_val_ok");
id = btf__add_int(btf, "int", 4, BTF_INT_SIGNED);
ASSERT_EQ(id, 2, "int_id");
id = btf__add_struct(btf, "s", 4);
ASSERT_EQ(id, 3, "struct_id");
err = btf__add_field(btf, "x", 2, 0, 0);
ASSERT_OK(err, "field_ok");
for (i = 1; i <= btf__get_nr_types(btf); i++) {
err = btf_dump__dump_type(d, i);
ASSERT_OK(err, "dump_type_ok");
}
fflush(dump_buf_file);
dump_buf[dump_buf_sz] = 0; /* some libc implementations don't do this */
ASSERT_STREQ(dump_buf,
"enum {\n"
" VAL = 1,\n"
"};\n"
"\n"
"struct s {\n"
" int x;\n"
"};\n\n", "c_dump1");
/* Now, after dumping original BTF, append another struct that embeds
* anonymous enum. It also has a name conflict with the first struct:
*
* struct s___2 {
* enum { VAL___2 = 1 } x;
* struct s s;
* };
*
* This will test that btf_dump'er maintains internal state properly.
* Note that VAL___2 enum value. It's because we've already emitted
* that enum as a global anonymous enum, so btf_dump will ensure that
* enum values don't conflict;
*
*/
fseek(dump_buf_file, 0, SEEK_SET);
id = btf__add_struct(btf, "s", 4);
ASSERT_EQ(id, 4, "struct_id");
err = btf__add_field(btf, "x", 1, 0, 0);
ASSERT_OK(err, "field_ok");
err = btf__add_field(btf, "s", 3, 32, 0);
ASSERT_OK(err, "field_ok");
for (i = 1; i <= btf__get_nr_types(btf); i++) {
err = btf_dump__dump_type(d, i);
ASSERT_OK(err, "dump_type_ok");
}
fflush(dump_buf_file);
dump_buf[dump_buf_sz] = 0; /* some libc implementations don't do this */
ASSERT_STREQ(dump_buf,
"struct s___2 {\n"
" enum {\n"
" VAL___2 = 1,\n"
" } x;\n"
" struct s s;\n"
"};\n\n" , "c_dump1");
err_out:
fclose(dump_buf_file);
free(dump_buf);
btf_dump__free(d);
btf__free(btf);
}
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]);
}
if (test__start_subtest("btf_dump: incremental"))
test_btf_dump_incremental();
}
|
