summaryrefslogtreecommitdiff
path: root/tools/testing/selftests/bpf/prog_tests/btf_dump.c
blob: b293b8501fd603f96ed5f4b1f61c393a75164d09 (plain)
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
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
// 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;
} 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, void *ctx)
{
	size_t type_cnt = btf__type_cnt(btf);
	struct btf_dump *d;
	int err = 0, id;

	d = btf_dump__new(btf, btf_dump_printf, ctx, NULL);
	err = libbpf_get_error(d);
	if (err)
		return err;

	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.bpf.o", t->file);

	btf = btf__parse_elf(test_file, NULL);
	if (!ASSERT_OK_PTR(btf, "btf_parse_elf")) {
		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 (!ASSERT_GE(fd, 0, "create_tmp")) {
		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;
	}

	err = btf_dump_all_types(btf, f);
	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;

static void test_btf_dump_incremental(void)
{
	struct btf *btf = NULL;
	struct btf_dump *d = NULL;
	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;
	d = btf_dump__new(btf, btf_dump_printf, dump_buf_file, NULL);
	if (!ASSERT_OK(libbpf_get_error(d), "btf_dump__new"))
		goto err_out;

	/* First, generate BTF corresponding to the following C code:
	 *
	 * enum x;
	 *
	 * enum x { X = 1 };
	 *
	 * enum { Y = 1 };
	 *
	 * struct s;
	 *
	 * struct s { int x; };
	 *
	 */
	id = btf__add_enum(btf, "x", 4);
	ASSERT_EQ(id, 1, "enum_declaration_id");
	id = btf__add_enum(btf, "x", 4);
	ASSERT_EQ(id, 2, "named_enum_id");
	err = btf__add_enum_value(btf, "X", 1);
	ASSERT_OK(err, "named_enum_val_ok");

	id = btf__add_enum(btf, NULL, 4);
	ASSERT_EQ(id, 3, "anon_enum_id");
	err = btf__add_enum_value(btf, "Y", 1);
	ASSERT_OK(err, "anon_enum_val_ok");

	id = btf__add_int(btf, "int", 4, BTF_INT_SIGNED);
	ASSERT_EQ(id, 4, "int_id");

	id = btf__add_fwd(btf, "s", BTF_FWD_STRUCT);
	ASSERT_EQ(id, 5, "fwd_id");

	id = btf__add_struct(btf, "s", 4);
	ASSERT_EQ(id, 6, "struct_id");
	err = btf__add_field(btf, "x", 4, 0, 0);
	ASSERT_OK(err, "field_ok");

	for (i = 1; i < btf__type_cnt(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 x;\n"
"\n"
"enum x {\n"
"	X = 1,\n"
"};\n"
"\n"
"enum {\n"
"	Y = 1,\n"
"};\n"
"\n"
"struct s;\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, 7, "struct_id");
	err = btf__add_field(btf, "x", 2, 0, 0);
	ASSERT_OK(err, "field_ok");
	err = btf__add_field(btf, "y", 3, 32, 0);
	ASSERT_OK(err, "field_ok");
	err = btf__add_field(btf, "s", 6, 64, 0);
	ASSERT_OK(err, "field_ok");

	for (i = 1; i < btf__type_cnt(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 x x;\n"
"	enum {\n"
"		Y___2 = 1,\n"
"	} y;\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);
}

#define STRSIZE				4096

static void btf_dump_snprintf(void *ctx, const char *fmt, va_list args)
{
	char *s = ctx, new[STRSIZE];

	vsnprintf(new, STRSIZE, fmt, args);
	if (strlen(s) < STRSIZE)
		strncat(s, new, STRSIZE - strlen(s) - 1);
}

static int btf_dump_data(struct btf *btf, struct btf_dump *d,
			 char *name, char *prefix, __u64 flags, void *ptr,
			 size_t ptr_sz, char *str, const char *expected_val)
{
	DECLARE_LIBBPF_OPTS(btf_dump_type_data_opts, opts);
	size_t type_sz;
	__s32 type_id;
	int ret = 0;

	if (flags & BTF_F_COMPACT)
		opts.compact = true;
	if (flags & BTF_F_NONAME)
		opts.skip_names = true;
	if (flags & BTF_F_ZERO)
		opts.emit_zeroes = true;
	if (prefix) {
		ASSERT_STRNEQ(name, prefix, strlen(prefix),
			      "verify prefix match");
		name += strlen(prefix) + 1;
	}
	type_id = btf__find_by_name(btf, name);
	if (!ASSERT_GE(type_id, 0, "find type id"))
		return -ENOENT;
	type_sz = btf__resolve_size(btf, type_id);
	str[0] = '\0';
	ret = btf_dump__dump_type_data(d, type_id, ptr, ptr_sz, &opts);
	if (type_sz <= ptr_sz) {
		if (!ASSERT_EQ(ret, type_sz, "failed/unexpected type_sz"))
			return -EINVAL;
	} else {
		if (!ASSERT_EQ(ret, -E2BIG, "failed to return -E2BIG"))
			return -EINVAL;
	}
	if (!ASSERT_STREQ(str, expected_val, "ensure expected/actual match"))
		return -EFAULT;
	return 0;
}

#define TEST_BTF_DUMP_DATA(_b, _d, _prefix, _str, _type, _flags,	\
			   _expected, ...)				\
	do {								\
		char __ptrtype[64] = #_type;				\
		char *_ptrtype = (char *)__ptrtype;			\
		_type _ptrdata = __VA_ARGS__;				\
		void *_ptr = &_ptrdata;					\
									\
		(void) btf_dump_data(_b, _d, _ptrtype, _prefix, _flags,	\
				     _ptr, sizeof(_type), _str,		\
				     _expected);			\
	} while (0)

/* Use where expected data string matches its stringified declaration */
#define TEST_BTF_DUMP_DATA_C(_b, _d, _prefix,  _str, _type, _flags,	\
			     ...)					\
	TEST_BTF_DUMP_DATA(_b, _d, _prefix, _str, _type, _flags,	\
			   "(" #_type ")" #__VA_ARGS__,	__VA_ARGS__)

/* overflow test; pass typesize < expected type size, ensure E2BIG returned */
#define TEST_BTF_DUMP_DATA_OVER(_b, _d, _prefix, _str, _type, _type_sz,	\
				_expected, ...)				\
	do {								\
		char __ptrtype[64] = #_type;				\
		char *_ptrtype = (char *)__ptrtype;			\
		_type _ptrdata = __VA_ARGS__;				\
		void *_ptr = &_ptrdata;					\
									\
		(void) btf_dump_data(_b, _d, _ptrtype, _prefix, 0,	\
				     _ptr, _type_sz, _str, _expected);	\
	} while (0)

#define TEST_BTF_DUMP_VAR(_b, _d, _prefix, _str, _var, _type, _flags,	\
			  _expected, ...)				\
	do {								\
		_type _ptrdata = __VA_ARGS__;				\
		void *_ptr = &_ptrdata;					\
									\
		(void) btf_dump_data(_b, _d, _var, _prefix, _flags,	\
				     _ptr, sizeof(_type), _str,		\
				     _expected);			\
	} while (0)

static void test_btf_dump_int_data(struct btf *btf, struct btf_dump *d,
				   char *str)
{
#ifdef __SIZEOF_INT128__
	unsigned __int128 i = 0xffffffffffffffff;

	/* this dance is required because we cannot directly initialize
	 * a 128-bit value to anything larger than a 64-bit value.
	 */
	i = (i << 64) | (i - 1);
#endif
	/* simple int */
	TEST_BTF_DUMP_DATA_C(btf, d, NULL, str, int, BTF_F_COMPACT, 1234);
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, BTF_F_COMPACT | BTF_F_NONAME,
			   "1234", 1234);
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, 0, "(int)1234", 1234);

	/* zero value should be printed at toplevel */
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, BTF_F_COMPACT, "(int)0", 0);
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, BTF_F_COMPACT | BTF_F_NONAME,
			   "0", 0);
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, BTF_F_COMPACT | BTF_F_ZERO,
			   "(int)0", 0);
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, int,
			   BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
			   "0", 0);
	TEST_BTF_DUMP_DATA_C(btf, d, NULL, str, int, BTF_F_COMPACT, -4567);
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, BTF_F_COMPACT | BTF_F_NONAME,
			   "-4567", -4567);
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, int, 0, "(int)-4567", -4567);

	TEST_BTF_DUMP_DATA_OVER(btf, d, NULL, str, int, sizeof(int)-1, "", 1);

#ifdef __SIZEOF_INT128__
	/* gcc encode unsigned __int128 type with name "__int128 unsigned" in dwarf,
	 * and clang encode it with name "unsigned __int128" in dwarf.
	 * Do an availability test for either variant before doing actual test.
	 */
	if (btf__find_by_name(btf, "unsigned __int128") > 0) {
		TEST_BTF_DUMP_DATA(btf, d, NULL, str, unsigned __int128, BTF_F_COMPACT,
				   "(unsigned __int128)0xffffffffffffffff",
				   0xffffffffffffffff);
		ASSERT_OK(btf_dump_data(btf, d, "unsigned __int128", NULL, 0, &i, 16, str,
					"(unsigned __int128)0xfffffffffffffffffffffffffffffffe"),
			  "dump unsigned __int128");
	} else if (btf__find_by_name(btf, "__int128 unsigned") > 0) {
		TEST_BTF_DUMP_DATA(btf, d, NULL, str, __int128 unsigned, BTF_F_COMPACT,
				   "(__int128 unsigned)0xffffffffffffffff",
				   0xffffffffffffffff);
		ASSERT_OK(btf_dump_data(btf, d, "__int128 unsigned", NULL, 0, &i, 16, str,
					"(__int128 unsigned)0xfffffffffffffffffffffffffffffffe"),
			  "dump unsigned __int128");
	} else {
		ASSERT_TRUE(false, "unsigned_int128_not_found");
	}
#endif
}

static void test_btf_dump_float_data(struct btf *btf, struct btf_dump *d,
				     char *str)
{
	float t1 = 1.234567;
	float t2 = -1.234567;
	float t3 = 0.0;
	double t4 = 5.678912;
	double t5 = -5.678912;
	double t6 = 0.0;
	long double t7 = 9.876543;
	long double t8 = -9.876543;
	long double t9 = 0.0;

	/* since the kernel does not likely have any float types in its BTF, we
	 * will need to add some of various sizes.
	 */

	ASSERT_GT(btf__add_float(btf, "test_float", 4), 0, "add float");
	ASSERT_OK(btf_dump_data(btf, d, "test_float", NULL, 0, &t1, 4, str,
				"(test_float)1.234567"), "dump float");
	ASSERT_OK(btf_dump_data(btf, d, "test_float", NULL, 0, &t2, 4, str,
				"(test_float)-1.234567"), "dump float");
	ASSERT_OK(btf_dump_data(btf, d, "test_float", NULL, 0, &t3, 4, str,
				"(test_float)0.000000"), "dump float");

	ASSERT_GT(btf__add_float(btf, "test_double", 8), 0, "add_double");
	ASSERT_OK(btf_dump_data(btf, d, "test_double", NULL, 0, &t4, 8, str,
		  "(test_double)5.678912"), "dump double");
	ASSERT_OK(btf_dump_data(btf, d, "test_double", NULL, 0, &t5, 8, str,
		  "(test_double)-5.678912"), "dump double");
	ASSERT_OK(btf_dump_data(btf, d, "test_double", NULL, 0, &t6, 8, str,
				"(test_double)0.000000"), "dump double");

	ASSERT_GT(btf__add_float(btf, "test_long_double", 16), 0, "add long double");
	ASSERT_OK(btf_dump_data(btf, d, "test_long_double", NULL, 0, &t7, 16,
				str, "(test_long_double)9.876543"),
				"dump long_double");
	ASSERT_OK(btf_dump_data(btf, d, "test_long_double", NULL, 0, &t8, 16,
				str, "(test_long_double)-9.876543"),
				"dump long_double");
	ASSERT_OK(btf_dump_data(btf, d, "test_long_double", NULL, 0, &t9, 16,
				str, "(test_long_double)0.000000"),
				"dump long_double");
}

static void test_btf_dump_char_data(struct btf *btf, struct btf_dump *d,
				    char *str)
{
	/* simple char */
	TEST_BTF_DUMP_DATA_C(btf, d, NULL, str, char, BTF_F_COMPACT, 100);
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, char, BTF_F_COMPACT | BTF_F_NONAME,
			   "100", 100);
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, char, 0, "(char)100", 100);
	/* zero value should be printed at toplevel */
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, char, BTF_F_COMPACT,
			   "(char)0", 0);
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, char, BTF_F_COMPACT | BTF_F_NONAME,
			   "0", 0);
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, char, BTF_F_COMPACT | BTF_F_ZERO,
			   "(char)0", 0);
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, char, BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
			   "0", 0);
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, char, 0, "(char)0", 0);

	TEST_BTF_DUMP_DATA_OVER(btf, d, NULL, str, char, sizeof(char)-1, "", 100);
}

static void test_btf_dump_typedef_data(struct btf *btf, struct btf_dump *d,
				       char *str)
{
	/* simple typedef */
	TEST_BTF_DUMP_DATA_C(btf, d, NULL, str, uint64_t, BTF_F_COMPACT, 100);
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, u64, BTF_F_COMPACT | BTF_F_NONAME,
			   "1", 1);
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, u64, 0, "(u64)1", 1);
	/* zero value should be printed at toplevel */
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, u64, BTF_F_COMPACT, "(u64)0", 0);
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, u64, BTF_F_COMPACT | BTF_F_NONAME,
			   "0", 0);
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, u64, BTF_F_COMPACT | BTF_F_ZERO,
			   "(u64)0", 0);
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, u64,
			   BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
			   "0", 0);
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, u64, 0, "(u64)0", 0);

	/* typedef struct */
	TEST_BTF_DUMP_DATA_C(btf, d, NULL, str, atomic_t, BTF_F_COMPACT,
			     {.counter = (int)1,});
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t, BTF_F_COMPACT | BTF_F_NONAME,
			   "{1,}", { .counter = 1 });
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t, 0,
"(atomic_t){\n"
"	.counter = (int)1,\n"
"}",
			   {.counter = 1,});
	/* typedef with 0 value should be printed at toplevel */
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t, BTF_F_COMPACT, "(atomic_t){}",
			   {.counter = 0,});
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t, BTF_F_COMPACT | BTF_F_NONAME,
			   "{}", {.counter = 0,});
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t, 0,
"(atomic_t){\n"
"}",
			   {.counter = 0,});
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t, BTF_F_COMPACT | BTF_F_ZERO,
			   "(atomic_t){.counter = (int)0,}",
			   {.counter = 0,});
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t,
			   BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
			   "{0,}", {.counter = 0,});
	TEST_BTF_DUMP_DATA(btf, d, NULL, str, atomic_t, BTF_F_ZERO,
"(atomic_t){\n"
"	.counter = (int)0,\n"
"}",
			   { .counter = 0,});

	/* overflow should show type but not value since it overflows */
	TEST_BTF_DUMP_DATA_OVER(btf, d, NULL, str, atomic_t, sizeof(atomic_t)-1,
				"(atomic_t){\n", { .counter = 1});
}

static void test_btf_dump_enum_data(struct btf *btf, struct btf_dump *d,
				    char *str)
{
	/* enum where enum value does (and does not) exist */
	TEST_BTF_DUMP_DATA_C(btf, d, "enum", str, enum bpf_cmd, BTF_F_COMPACT,
			     BPF_MAP_CREATE);
	TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd, BTF_F_COMPACT,
			   "(enum bpf_cmd)BPF_MAP_CREATE", 0);
	TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd,
			   BTF_F_COMPACT | BTF_F_NONAME,
			   "BPF_MAP_CREATE",
			   BPF_MAP_CREATE);
	TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd, 0,
			   "(enum bpf_cmd)BPF_MAP_CREATE",
			   BPF_MAP_CREATE);
	TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd,
			   BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
			   "BPF_MAP_CREATE", 0);
	TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd,
			   BTF_F_COMPACT | BTF_F_ZERO,
			   "(enum bpf_cmd)BPF_MAP_CREATE",
			   BPF_MAP_CREATE);
	TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd,
			   BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
			   "BPF_MAP_CREATE", BPF_MAP_CREATE);
	TEST_BTF_DUMP_DATA_C(btf, d, "enum", str, enum bpf_cmd, BTF_F_COMPACT, 2000);
	TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd,
			   BTF_F_COMPACT | BTF_F_NONAME,
			   "2000", 2000);
	TEST_BTF_DUMP_DATA(btf, d, "enum", str, enum bpf_cmd, 0,
			   "(enum bpf_cmd)2000", 2000);

	TEST_BTF_DUMP_DATA_OVER(btf, d, "enum", str, enum bpf_cmd,
				sizeof(enum bpf_cmd) - 1, "", BPF_MAP_CREATE);
}

static void test_btf_dump_struct_data(struct btf *btf, struct btf_dump *d,
				      char *str)
{
	DECLARE_LIBBPF_OPTS(btf_dump_type_data_opts, opts);
	char zero_data[512] = { };
	char type_data[512];
	void *fops = type_data;
	void *skb = type_data;
	size_t type_sz;
	__s32 type_id;
	char *cmpstr;
	int ret;

	memset(type_data, 255, sizeof(type_data));

	/* simple struct */
	TEST_BTF_DUMP_DATA_C(btf, d, "struct", str, struct btf_enum, BTF_F_COMPACT,
			     {.name_off = (__u32)3,.val = (__s32)-1,});
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum,
			   BTF_F_COMPACT | BTF_F_NONAME,
			   "{3,-1,}",
			   { .name_off = 3, .val = -1,});
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum, 0,
"(struct btf_enum){\n"
"	.name_off = (__u32)3,\n"
"	.val = (__s32)-1,\n"
"}",
			   { .name_off = 3, .val = -1,});
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum,
			   BTF_F_COMPACT | BTF_F_NONAME,
			   "{-1,}",
			   { .name_off = 0, .val = -1,});
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum,
			   BTF_F_COMPACT | BTF_F_NONAME | BTF_F_ZERO,
			   "{0,-1,}",
			   { .name_off = 0, .val = -1,});
	/* empty struct should be printed */
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum, BTF_F_COMPACT,
			   "(struct btf_enum){}",
			   { .name_off = 0, .val = 0,});
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum,
			   BTF_F_COMPACT | BTF_F_NONAME,
			   "{}",
			   { .name_off = 0, .val = 0,});
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum, 0,
"(struct btf_enum){\n"
"}",
			   { .name_off = 0, .val = 0,});
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum,
			   BTF_F_COMPACT | BTF_F_ZERO,
			   "(struct btf_enum){.name_off = (__u32)0,.val = (__s32)0,}",
			   { .name_off = 0, .val = 0,});
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct btf_enum,
			   BTF_F_ZERO,
"(struct btf_enum){\n"
"	.name_off = (__u32)0,\n"
"	.val = (__s32)0,\n"
"}",
			   { .name_off = 0, .val = 0,});

	/* struct with pointers */
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct list_head, BTF_F_COMPACT,
			   "(struct list_head){.next = (struct list_head *)0x1,}",
			   { .next = (struct list_head *)1 });
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct list_head, 0,
"(struct list_head){\n"
"	.next = (struct list_head *)0x1,\n"
"}",
			   { .next = (struct list_head *)1 });
	/* NULL pointer should not be displayed */
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct list_head, BTF_F_COMPACT,
			   "(struct list_head){}",
			   { .next = (struct list_head *)0 });
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct list_head, 0,
"(struct list_head){\n"
"}",
			   { .next = (struct list_head *)0 });

	/* struct with function pointers */
	type_id = btf__find_by_name(btf, "file_operations");
	if (ASSERT_GT(type_id, 0, "find type id")) {
		type_sz = btf__resolve_size(btf, type_id);
		str[0] = '\0';

		ret = btf_dump__dump_type_data(d, type_id, fops, type_sz, &opts);
		ASSERT_EQ(ret, type_sz,
			  "unexpected return value dumping file_operations");
		cmpstr =
"(struct file_operations){\n"
"	.owner = (struct module *)0xffffffffffffffff,\n"
"	.fop_flags = (fop_flags_t)4294967295,";

		ASSERT_STRNEQ(str, cmpstr, strlen(cmpstr), "file_operations");
	}

	/* struct with char array */
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_prog_info, BTF_F_COMPACT,
			   "(struct bpf_prog_info){.name = (char[16])['f','o','o',],}",
			   { .name = "foo",});
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_prog_info,
			   BTF_F_COMPACT | BTF_F_NONAME,
			   "{['f','o','o',],}",
			   {.name = "foo",});
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_prog_info, 0,
"(struct bpf_prog_info){\n"
"	.name = (char[16])[\n"
"		'f',\n"
"		'o',\n"
"		'o',\n"
"	],\n"
"}",
			   {.name = "foo",});
	/* leading null char means do not display string */
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_prog_info, BTF_F_COMPACT,
			   "(struct bpf_prog_info){}",
			   {.name = {'\0', 'f', 'o', 'o'}});
	/* handle non-printable characters */
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_prog_info, BTF_F_COMPACT,
			   "(struct bpf_prog_info){.name = (char[16])[1,2,3,],}",
			   { .name = {1, 2, 3, 0}});

	/* struct with non-char array */
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct __sk_buff, BTF_F_COMPACT,
			   "(struct __sk_buff){.cb = (__u32[5])[1,2,3,4,5,],}",
			   { .cb = {1, 2, 3, 4, 5,},});
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct __sk_buff,
			   BTF_F_COMPACT | BTF_F_NONAME,
			   "{[1,2,3,4,5,],}",
			   { .cb = { 1, 2, 3, 4, 5},});
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct __sk_buff, 0,
"(struct __sk_buff){\n"
"	.cb = (__u32[5])[\n"
"		1,\n"
"		2,\n"
"		3,\n"
"		4,\n"
"		5,\n"
"	],\n"
"}",
			   { .cb = { 1, 2, 3, 4, 5},});
	/* For non-char, arrays, show non-zero values only */
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct __sk_buff, BTF_F_COMPACT,
			   "(struct __sk_buff){.cb = (__u32[5])[0,0,1,0,0,],}",
			   { .cb = { 0, 0, 1, 0, 0},});
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct __sk_buff, 0,
"(struct __sk_buff){\n"
"	.cb = (__u32[5])[\n"
"		0,\n"
"		0,\n"
"		1,\n"
"		0,\n"
"		0,\n"
"	],\n"
"}",
			   { .cb = { 0, 0, 1, 0, 0},});

	/* struct with bitfields */
	TEST_BTF_DUMP_DATA_C(btf, d, "struct", str, struct bpf_insn, BTF_F_COMPACT,
		{.code = (__u8)1,.dst_reg = (__u8)0x2,.src_reg = (__u8)0x3,.off = (__s16)4,.imm = (__s32)5,});
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_insn,
			   BTF_F_COMPACT | BTF_F_NONAME,
			   "{1,0x2,0x3,4,5,}",
			   { .code = 1, .dst_reg = 0x2, .src_reg = 0x3, .off = 4,
			     .imm = 5,});
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_insn, 0,
"(struct bpf_insn){\n"
"	.code = (__u8)1,\n"
"	.dst_reg = (__u8)0x2,\n"
"	.src_reg = (__u8)0x3,\n"
"	.off = (__s16)4,\n"
"	.imm = (__s32)5,\n"
"}",
			   {.code = 1, .dst_reg = 2, .src_reg = 3, .off = 4, .imm = 5});

	/* zeroed bitfields should not be displayed */
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_insn, BTF_F_COMPACT,
			   "(struct bpf_insn){.dst_reg = (__u8)0x1,}",
			   { .code = 0, .dst_reg = 1});

	/* struct with enum bitfield */
	type_id = btf__find_by_name(btf, "fs_context");
	if (ASSERT_GT(type_id,  0, "find fs_context")) {
		type_sz = btf__resolve_size(btf, type_id);
		str[0] = '\0';

		opts.emit_zeroes = true;
		ret = btf_dump__dump_type_data(d, type_id, zero_data, type_sz, &opts);
		ASSERT_EQ(ret, type_sz,
			  "unexpected return value dumping fs_context");

		ASSERT_NEQ(strstr(str, "FS_CONTEXT_FOR_MOUNT"), NULL,
				  "bitfield value not present");
	}

	/* struct with nested anon union */
	TEST_BTF_DUMP_DATA(btf, d, "struct", str, struct bpf_sock_ops, BTF_F_COMPACT,
			   "(struct bpf_sock_ops){.op = (__u32)1,(union){.args = (__u32[4])[1,2,3,4,],.reply = (__u32)1,.replylong = (__u32[4])[1,2,3,4,],},}",
			   { .op = 1, .args = { 1, 2, 3, 4}});

	/* union with nested struct */
	TEST_BTF_DUMP_DATA(btf, d, "union", str, union bpf_iter_link_info, BTF_F_COMPACT,
			   "(union bpf_iter_link_info){.map = (struct){.map_fd = (__u32)1,},.cgroup = (struct){.order = (enum bpf_cgroup_iter_order)BPF_CGROUP_ITER_SELF_ONLY,.cgroup_fd = (__u32)1,},.task = (struct){.tid = (__u32)1,.pid = (__u32)1,},}",
			   { .cgroup = { .order = 1, .cgroup_fd = 1, }});

	/* struct skb with nested structs/unions; because type output is so
	 * complex, we don't do a string comparison, just verify we return
	 * the type size as the amount of data displayed.
	 */
	type_id = btf__find_by_name(btf, "sk_buff");
	if (ASSERT_GT(type_id, 0, "find struct sk_buff")) {
		type_sz = btf__resolve_size(btf, type_id);
		str[0] = '\0';

		ret = btf_dump__dump_type_data(d, type_id, skb, type_sz, &opts);
		ASSERT_EQ(ret, type_sz,
			  "unexpected return value dumping sk_buff");
	}

	/* overflow bpf_sock_ops struct with final element nonzero/zero.
	 * Regardless of the value of the final field, we don't have all the
	 * data we need to display it, so we should trigger an overflow.
	 * In other words overflow checking should trump "is field zero?"
	 * checks because if we've overflowed, it shouldn't matter what the
	 * field is - we can't trust its value so shouldn't display it.
	 */
	TEST_BTF_DUMP_DATA_OVER(btf, d, "struct", str, struct bpf_sock_ops,
				sizeof(struct bpf_sock_ops) - 1,
				"(struct bpf_sock_ops){\n\t.op = (__u32)1,\n",
				{ .op = 1, .skb_hwtstamp = 2});
	TEST_BTF_DUMP_DATA_OVER(btf, d, "struct", str, struct bpf_sock_ops,
				sizeof(struct bpf_sock_ops) - 1,
				"(struct bpf_sock_ops){\n\t.op = (__u32)1,\n",
				{ .op = 1, .skb_hwtstamp = 0});
}

static void test_btf_dump_var_data(struct btf *btf, struct btf_dump *d,
				   char *str)
{
#if 0
	TEST_BTF_DUMP_VAR(btf, d, NULL, str, "cpu_number", int, BTF_F_COMPACT,
			  "int cpu_number = (int)100", 100);
#endif
	TEST_BTF_DUMP_VAR(btf, d, NULL, str, "bpf_cgrp_storage_busy", int, BTF_F_COMPACT,
			  "static int bpf_cgrp_storage_busy = (int)2", 2);
}

static void test_btf_datasec(struct btf *btf, struct btf_dump *d, char *str,
			     const char *name, const char *expected_val,
			     void *data, size_t data_sz)
{
	DECLARE_LIBBPF_OPTS(btf_dump_type_data_opts, opts);
	int ret = 0, cmp;
	size_t secsize;
	__s32 type_id;

	opts.compact = true;

	type_id = btf__find_by_name(btf, name);
	if (!ASSERT_GT(type_id, 0, "find type id"))
		return;

	secsize = btf__resolve_size(btf, type_id);
	ASSERT_EQ(secsize,  0, "verify section size");

	str[0] = '\0';
	ret = btf_dump__dump_type_data(d, type_id, data, data_sz, &opts);
	ASSERT_EQ(ret, 0, "unexpected return value");

	cmp = strcmp(str, expected_val);
	ASSERT_EQ(cmp, 0, "ensure expected/actual match");
}

static void test_btf_dump_datasec_data(char *str)
{
	struct btf *btf;
	char license[4] = "GPL";
	struct btf_dump *d;

	btf = btf__parse("xdping_kern.bpf.o", NULL);
	if (!ASSERT_OK_PTR(btf, "xdping_kern.bpf.o BTF not found"))
		return;

	d = btf_dump__new(btf, btf_dump_snprintf, str, NULL);
	if (!ASSERT_OK_PTR(d, "could not create BTF dump"))
		goto out;

	test_btf_datasec(btf, d, str, "license",
			 "SEC(\"license\") char[4] _license = (char[4])['G','P','L',];",
			 license, sizeof(license));
out:
	btf_dump__free(d);
	btf__free(btf);
}

void test_btf_dump() {
	char str[STRSIZE];
	struct btf_dump *d;
	struct btf *btf;
	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();

	btf = libbpf_find_kernel_btf();
	if (!ASSERT_OK_PTR(btf, "no kernel BTF found"))
		return;

	d = btf_dump__new(btf, btf_dump_snprintf, str, NULL);
	if (!ASSERT_OK_PTR(d, "could not create BTF dump"))
		return;

	/* Verify type display for various types. */
	if (test__start_subtest("btf_dump: int_data"))
		test_btf_dump_int_data(btf, d, str);
	if (test__start_subtest("btf_dump: float_data"))
		test_btf_dump_float_data(btf, d, str);
	if (test__start_subtest("btf_dump: char_data"))
		test_btf_dump_char_data(btf, d, str);
	if (test__start_subtest("btf_dump: typedef_data"))
		test_btf_dump_typedef_data(btf, d, str);
	if (test__start_subtest("btf_dump: enum_data"))
		test_btf_dump_enum_data(btf, d, str);
	if (test__start_subtest("btf_dump: struct_data"))
		test_btf_dump_struct_data(btf, d, str);
	if (test__start_subtest("btf_dump: var_data"))
		test_btf_dump_var_data(btf, d, str);
	btf_dump__free(d);
	btf__free(btf);

	if (test__start_subtest("btf_dump: datasec_data"))
		test_btf_dump_datasec_data(str);
}