98 lines · c
1// SPDX-License-Identifier: GPL-2.02/* 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}98