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1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2020 Facebook */
3#include <test_progs.h>
4#include <bpf/btf.h>
5
6static char *dump_buf;
7static size_t dump_buf_sz;
8static FILE *dump_buf_file;
9
10static void btf_dump_printf(void *ctx, const char *fmt, va_list args)
11{
12 vfprintf(ctx, fmt, args);
13}
14
15void test_btf_split() {
16 struct btf_dump *d = NULL;
17 const struct btf_type *t;
18 struct btf *btf1, *btf2;
19 int str_off, i, err;
20
21 btf1 = btf__new_empty();
22 if (!ASSERT_OK_PTR(btf1, "empty_main_btf"))
23 return;
24
25 btf__set_pointer_size(btf1, 8); /* enforce 64-bit arch */
26
27 btf__add_int(btf1, "int", 4, BTF_INT_SIGNED); /* [1] int */
28 btf__add_ptr(btf1, 1); /* [2] ptr to int */
29
30 btf__add_struct(btf1, "s1", 4); /* [3] struct s1 { */
31 btf__add_field(btf1, "f1", 1, 0, 0); /* int f1; */
32 /* } */
33
34 btf2 = btf__new_empty_split(btf1);
35 if (!ASSERT_OK_PTR(btf2, "empty_split_btf"))
36 goto cleanup;
37
38 /* pointer size should be "inherited" from main BTF */
39 ASSERT_EQ(btf__pointer_size(btf2), 8, "inherit_ptr_sz");
40
41 str_off = btf__find_str(btf2, "int");
42 ASSERT_NEQ(str_off, -ENOENT, "str_int_missing");
43
44 t = btf__type_by_id(btf2, 1);
45 if (!ASSERT_OK_PTR(t, "int_type"))
46 goto cleanup;
47 ASSERT_EQ(btf_is_int(t), true, "int_kind");
48 ASSERT_STREQ(btf__str_by_offset(btf2, t->name_off), "int", "int_name");
49
50 btf__add_struct(btf2, "s2", 16); /* [4] struct s2 { */
51 btf__add_field(btf2, "f1", 3, 0, 0); /* struct s1 f1; */
52 btf__add_field(btf2, "f2", 1, 32, 0); /* int f2; */
53 btf__add_field(btf2, "f3", 2, 64, 0); /* int *f3; */
54 /* } */
55
56 t = btf__type_by_id(btf1, 4);
57 ASSERT_NULL(t, "split_type_in_main");
58
59 t = btf__type_by_id(btf2, 4);
60 if (!ASSERT_OK_PTR(t, "split_struct_type"))
61 goto cleanup;
62 ASSERT_EQ(btf_is_struct(t), true, "split_struct_kind");
63 ASSERT_EQ(btf_vlen(t), 3, "split_struct_vlen");
64 ASSERT_STREQ(btf__str_by_offset(btf2, t->name_off), "s2", "split_struct_name");
65
66 /* BTF-to-C dump of split BTF */
67 dump_buf_file = open_memstream(&dump_buf, &dump_buf_sz);
68 if (!ASSERT_OK_PTR(dump_buf_file, "dump_memstream"))
69 return;
70 d = btf_dump__new(btf2, btf_dump_printf, dump_buf_file, NULL);
71 if (!ASSERT_OK_PTR(d, "btf_dump__new"))
72 goto cleanup;
73 for (i = 1; i < btf__type_cnt(btf2); i++) {
74 err = btf_dump__dump_type(d, i);
75 ASSERT_OK(err, "dump_type_ok");
76 }
77 fflush(dump_buf_file);
78 dump_buf[dump_buf_sz] = 0; /* some libc implementations don't do this */
79 ASSERT_STREQ(dump_buf,
80"struct s1 {\n"
81" int f1;\n"
82"};\n"
83"\n"
84"struct s2 {\n"
85" struct s1 f1;\n"
86" int f2;\n"
87" int *f3;\n"
88"};\n\n", "c_dump");
89
90cleanup:
91 if (dump_buf_file)
92 fclose(dump_buf_file);
93 free(dump_buf);
94 btf_dump__free(d);
95 btf__free(btf1);
96 btf__free(btf2);
97}
1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2020 Facebook */
3#include <test_progs.h>
4#include <bpf/btf.h>
5
6static char *dump_buf;
7static size_t dump_buf_sz;
8static FILE *dump_buf_file;
9
10static void btf_dump_printf(void *ctx, const char *fmt, va_list args)
11{
12 vfprintf(ctx, fmt, args);
13}
14
15void test_btf_split() {
16 struct btf_dump_opts opts;
17 struct btf_dump *d = NULL;
18 const struct btf_type *t;
19 struct btf *btf1, *btf2;
20 int str_off, i, err;
21
22 btf1 = btf__new_empty();
23 if (!ASSERT_OK_PTR(btf1, "empty_main_btf"))
24 return;
25
26 btf__set_pointer_size(btf1, 8); /* enforce 64-bit arch */
27
28 btf__add_int(btf1, "int", 4, BTF_INT_SIGNED); /* [1] int */
29 btf__add_ptr(btf1, 1); /* [2] ptr to int */
30
31 btf__add_struct(btf1, "s1", 4); /* [3] struct s1 { */
32 btf__add_field(btf1, "f1", 1, 0, 0); /* int f1; */
33 /* } */
34
35 btf2 = btf__new_empty_split(btf1);
36 if (!ASSERT_OK_PTR(btf2, "empty_split_btf"))
37 goto cleanup;
38
39 /* pointer size should be "inherited" from main BTF */
40 ASSERT_EQ(btf__pointer_size(btf2), 8, "inherit_ptr_sz");
41
42 str_off = btf__find_str(btf2, "int");
43 ASSERT_NEQ(str_off, -ENOENT, "str_int_missing");
44
45 t = btf__type_by_id(btf2, 1);
46 if (!ASSERT_OK_PTR(t, "int_type"))
47 goto cleanup;
48 ASSERT_EQ(btf_is_int(t), true, "int_kind");
49 ASSERT_STREQ(btf__str_by_offset(btf2, t->name_off), "int", "int_name");
50
51 btf__add_struct(btf2, "s2", 16); /* [4] struct s2 { */
52 btf__add_field(btf2, "f1", 3, 0, 0); /* struct s1 f1; */
53 btf__add_field(btf2, "f2", 1, 32, 0); /* int f2; */
54 btf__add_field(btf2, "f3", 2, 64, 0); /* int *f3; */
55 /* } */
56
57 t = btf__type_by_id(btf1, 4);
58 ASSERT_NULL(t, "split_type_in_main");
59
60 t = btf__type_by_id(btf2, 4);
61 if (!ASSERT_OK_PTR(t, "split_struct_type"))
62 goto cleanup;
63 ASSERT_EQ(btf_is_struct(t), true, "split_struct_kind");
64 ASSERT_EQ(btf_vlen(t), 3, "split_struct_vlen");
65 ASSERT_STREQ(btf__str_by_offset(btf2, t->name_off), "s2", "split_struct_name");
66
67 /* BTF-to-C dump of split BTF */
68 dump_buf_file = open_memstream(&dump_buf, &dump_buf_sz);
69 if (!ASSERT_OK_PTR(dump_buf_file, "dump_memstream"))
70 return;
71 opts.ctx = dump_buf_file;
72 d = btf_dump__new(btf2, NULL, &opts, btf_dump_printf);
73 if (!ASSERT_OK_PTR(d, "btf_dump__new"))
74 goto cleanup;
75 for (i = 1; i <= btf__get_nr_types(btf2); i++) {
76 err = btf_dump__dump_type(d, i);
77 ASSERT_OK(err, "dump_type_ok");
78 }
79 fflush(dump_buf_file);
80 dump_buf[dump_buf_sz] = 0; /* some libc implementations don't do this */
81 ASSERT_STREQ(dump_buf,
82"struct s1 {\n"
83" int f1;\n"
84"};\n"
85"\n"
86"struct s2 {\n"
87" struct s1 f1;\n"
88" int f2;\n"
89" int *f3;\n"
90"};\n\n", "c_dump");
91
92cleanup:
93 if (dump_buf_file)
94 fclose(dump_buf_file);
95 free(dump_buf);
96 btf_dump__free(d);
97 btf__free(btf1);
98 btf__free(btf2);
99}