98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020 Facebook */
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#include <test_progs.h>
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#include <bpf/btf.h>
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static char *dump_buf;
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static size_t dump_buf_sz;
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static FILE *dump_buf_file;
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static void btf_dump_printf(void *ctx, const char *fmt, va_list args)
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{
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vfprintf(ctx, fmt, args);
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}
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void test_btf_split() {
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struct btf_dump *d = NULL;
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const struct btf_type *t;
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struct btf *btf1, *btf2;
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int str_off, i, err;
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btf1 = btf__new_empty();
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if (!ASSERT_OK_PTR(btf1, "empty_main_btf"))
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return;
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btf__set_pointer_size(btf1, 8); /* enforce 64-bit arch */
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btf__add_int(btf1, "int", 4, BTF_INT_SIGNED); /* [1] int */
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btf__add_ptr(btf1, 1); /* [2] ptr to int */
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btf__add_struct(btf1, "s1", 4); /* [3] struct s1 { */
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btf__add_field(btf1, "f1", 1, 0, 0); /* int f1; */
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/* } */
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btf2 = btf__new_empty_split(btf1);
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if (!ASSERT_OK_PTR(btf2, "empty_split_btf"))
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goto cleanup;
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/* pointer size should be "inherited" from main BTF */
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ASSERT_EQ(btf__pointer_size(btf2), 8, "inherit_ptr_sz");
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str_off = btf__find_str(btf2, "int");
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ASSERT_NEQ(str_off, -ENOENT, "str_int_missing");
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t = btf__type_by_id(btf2, 1);
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if (!ASSERT_OK_PTR(t, "int_type"))
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goto cleanup;
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ASSERT_EQ(btf_is_int(t), true, "int_kind");
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ASSERT_STREQ(btf__str_by_offset(btf2, t->name_off), "int", "int_name");
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btf__add_struct(btf2, "s2", 16); /* [4] struct s2 { */
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btf__add_field(btf2, "f1", 3, 0, 0); /* struct s1 f1; */
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btf__add_field(btf2, "f2", 1, 32, 0); /* int f2; */
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btf__add_field(btf2, "f3", 2, 64, 0); /* int *f3; */
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/* } */
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t = btf__type_by_id(btf1, 4);
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ASSERT_NULL(t, "split_type_in_main");
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t = btf__type_by_id(btf2, 4);
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if (!ASSERT_OK_PTR(t, "split_struct_type"))
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goto cleanup;
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ASSERT_EQ(btf_is_struct(t), true, "split_struct_kind");
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ASSERT_EQ(btf_vlen(t), 3, "split_struct_vlen");
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ASSERT_STREQ(btf__str_by_offset(btf2, t->name_off), "s2", "split_struct_name");
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/* BTF-to-C dump of split BTF */
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dump_buf_file = open_memstream(&dump_buf, &dump_buf_sz);
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if (!ASSERT_OK_PTR(dump_buf_file, "dump_memstream"))
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return;
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d = btf_dump__new(btf2, btf_dump_printf, dump_buf_file, NULL);
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if (!ASSERT_OK_PTR(d, "btf_dump__new"))
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goto cleanup;
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for (i = 1; i < btf__type_cnt(btf2); i++) {
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err = btf_dump__dump_type(d, i);
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ASSERT_OK(err, "dump_type_ok");
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}
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fflush(dump_buf_file);
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dump_buf[dump_buf_sz] = 0; /* some libc implementations don't do this */
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ASSERT_STREQ(dump_buf,
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"struct s1 {\n"
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" int f1;\n"
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"};\n"
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"\n"
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"struct s2 {\n"
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" struct s1 f1;\n"
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" int f2;\n"
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" int *f3;\n"
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"};\n\n", "c_dump");
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cleanup:
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if (dump_buf_file)
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fclose(dump_buf_file);
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free(dump_buf);
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btf_dump__free(d);
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btf__free(btf1);
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btf__free(btf2);
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}
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