Quelle  btf_write.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include <test_progs.h>
#include <bpf/btf.h>
#include "btf_helpers.h"

static void gen_btf(struct btf *btf)
{
 const struct btf_var_secinfo *vi;
 const struct btf_type *t;
 const struct btf_member *m;
 const struct btf_enum64 *v64;
 const struct btf_enum *v;
 const struct btf_param *p;
 int id, err, str_off;

 str_off = btf__find_str(btf, "int");
 ASSERT_EQ(str_off, -ENOENT, "int_str_missing_off");

 str_off = btf__add_str(btf, "int");
 ASSERT_EQ(str_off, 1, "int_str_off");

 str_off = btf__find_str(btf, "int");
 ASSERT_EQ(str_off, 1, "int_str_found_off");

 /* BTF_KIND_INT */
 id = btf__add_int(btf, "int", 4,  BTF_INT_SIGNED);
 ASSERT_EQ(id, 1, "int_id");

 t = btf__type_by_id(btf, 1);
 /* should re-use previously added "int" string */
 ASSERT_EQ(t->name_off, str_off, "int_name_off");
 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "int", "int_name");
 ASSERT_EQ(btf_kind(t), BTF_KIND_INT, "int_kind");
 ASSERT_EQ(t->size, 4, "int_sz");
 ASSERT_EQ(btf_int_encoding(t), BTF_INT_SIGNED, "int_enc");
 ASSERT_EQ(btf_int_bits(t), 32, "int_bits");
 ASSERT_STREQ(btf_type_raw_dump(btf, 1),
       "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", "raw_dump");

 /* invalid int size */
 id = btf__add_int(btf, "bad sz int", 7, 0);
 ASSERT_ERR(id, "int_bad_sz");
 /* invalid encoding */
 id = btf__add_int(btf, "bad enc int", 4, 123);
 ASSERT_ERR(id, "int_bad_enc");
 /* NULL name */
 id = btf__add_int(btf, NULL, 4, 0);
 ASSERT_ERR(id, "int_bad_null_name");
 /* empty name */
 id = btf__add_int(btf, "", 4, 0);
 ASSERT_ERR(id, "int_bad_empty_name");

 /* PTR/CONST/VOLATILE/RESTRICT */
 id = btf__add_ptr(btf, 1);
 ASSERT_EQ(id, 2, "ptr_id");
 t = btf__type_by_id(btf, 2);
 ASSERT_EQ(btf_kind(t), BTF_KIND_PTR, "ptr_kind");
 ASSERT_EQ(t->type, 1, "ptr_type");
 ASSERT_STREQ(btf_type_raw_dump(btf, 2),
       "[2] PTR '(anon)' type_id=1", "raw_dump");

 id = btf__add_const(btf, 5); /* points forward to restrict */
 ASSERT_EQ(id, 3, "const_id");
 t = btf__type_by_id(btf, 3);
 ASSERT_EQ(btf_kind(t), BTF_KIND_CONST, "const_kind");
 ASSERT_EQ(t->type, 5, "const_type");
 ASSERT_STREQ(btf_type_raw_dump(btf, 3),
       "[3] CONST '(anon)' type_id=5", "raw_dump");

 id = btf__add_volatile(btf, 3);
 ASSERT_EQ(id, 4, "volatile_id");
 t = btf__type_by_id(btf, 4);
 ASSERT_EQ(btf_kind(t), BTF_KIND_VOLATILE, "volatile_kind");
 ASSERT_EQ(t->type, 3, "volatile_type");
 ASSERT_STREQ(btf_type_raw_dump(btf, 4),
       "[4] VOLATILE '(anon)' type_id=3", "raw_dump");

 id = btf__add_restrict(btf, 4);
 ASSERT_EQ(id, 5, "restrict_id");
 t = btf__type_by_id(btf, 5);
 ASSERT_EQ(btf_kind(t), BTF_KIND_RESTRICT, "restrict_kind");
 ASSERT_EQ(t->type, 4, "restrict_type");
 ASSERT_STREQ(btf_type_raw_dump(btf, 5),
       "[5] RESTRICT '(anon)' type_id=4", "raw_dump");

 /* ARRAY */
 id = btf__add_array(btf, 1, 2, 10); /* int *[10] */
 ASSERT_EQ(id, 6, "array_id");
 t = btf__type_by_id(btf, 6);
 ASSERT_EQ(btf_kind(t), BTF_KIND_ARRAY, "array_kind");
 ASSERT_EQ(btf_array(t)->index_type, 1, "array_index_type");
 ASSERT_EQ(btf_array(t)->type, 2, "array_elem_type");
 ASSERT_EQ(btf_array(t)->nelems, 10, "array_nelems");
 ASSERT_STREQ(btf_type_raw_dump(btf, 6),
       "[6] ARRAY '(anon)' type_id=2 index_type_id=1 nr_elems=10", "raw_dump");

 /* STRUCT */
 err = btf__add_field(btf, "field", 1, 0, 0);
 ASSERT_ERR(err, "no_struct_field");
 id = btf__add_struct(btf, "s1", 8);
 ASSERT_EQ(id, 7, "struct_id");
 err = btf__add_field(btf, "f1", 1, 0, 0);
 ASSERT_OK(err, "f1_res");
 err = btf__add_field(btf, "f2", 1, 32, 16);
 ASSERT_OK(err, "f2_res");

 t = btf__type_by_id(btf, 7);
 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "s1", "struct_name");
 ASSERT_EQ(btf_kind(t), BTF_KIND_STRUCT, "struct_kind");
 ASSERT_EQ(btf_vlen(t), 2, "struct_vlen");
 ASSERT_EQ(btf_kflag(t), true, "struct_kflag");
 ASSERT_EQ(t->size, 8, "struct_sz");
 m = btf_members(t) + 0;
 ASSERT_STREQ(btf__str_by_offset(btf, m->name_off), "f1", "f1_name");
 ASSERT_EQ(m->type, 1, "f1_type");
 ASSERT_EQ(btf_member_bit_offset(t, 0), 0, "f1_bit_off");
 ASSERT_EQ(btf_member_bitfield_size(t, 0), 0, "f1_bit_sz");
 m = btf_members(t) + 1;
 ASSERT_STREQ(btf__str_by_offset(btf, m->name_off), "f2", "f2_name");
 ASSERT_EQ(m->type, 1, "f2_type");
 ASSERT_EQ(btf_member_bit_offset(t, 1), 32, "f2_bit_off");
 ASSERT_EQ(btf_member_bitfield_size(t, 1), 16, "f2_bit_sz");
 ASSERT_STREQ(btf_type_raw_dump(btf, 7),
       "[7] STRUCT 's1' size=8 vlen=2\n"
       "\t'f1' type_id=1 bits_offset=0\n"
       "\t'f2' type_id=1 bits_offset=32 bitfield_size=16", "raw_dump");

 /* UNION */
 id = btf__add_union(btf, "u1", 8);
 ASSERT_EQ(id, 8, "union_id");

 /* invalid, non-zero offset */
 err = btf__add_field(btf, "field", 1, 1, 0);
 ASSERT_ERR(err, "no_struct_field");

 err = btf__add_field(btf, "f1", 1, 0, 16);
 ASSERT_OK(err, "f1_res");

 t = btf__type_by_id(btf, 8);
 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "u1", "union_name");
 ASSERT_EQ(btf_kind(t), BTF_KIND_UNION, "union_kind");
 ASSERT_EQ(btf_vlen(t), 1, "union_vlen");
 ASSERT_EQ(btf_kflag(t), true, "union_kflag");
 ASSERT_EQ(t->size, 8, "union_sz");
 m = btf_members(t) + 0;
 ASSERT_STREQ(btf__str_by_offset(btf, m->name_off), "f1", "f1_name");
 ASSERT_EQ(m->type, 1, "f1_type");
 ASSERT_EQ(btf_member_bit_offset(t, 0), 0, "f1_bit_off");
 ASSERT_EQ(btf_member_bitfield_size(t, 0), 16, "f1_bit_sz");
 ASSERT_STREQ(btf_type_raw_dump(btf, 8),
       "[8] UNION 'u1' size=8 vlen=1\n"
       "\t'f1' type_id=1 bits_offset=0 bitfield_size=16", "raw_dump");

 /* ENUM */
 id = btf__add_enum(btf, "e1", 4);
 ASSERT_EQ(id, 9, "enum_id");
 err = btf__add_enum_value(btf, "v1", 1);
 ASSERT_OK(err, "v1_res");
 err = btf__add_enum_value(btf, "v2", 2);
 ASSERT_OK(err, "v2_res");

 t = btf__type_by_id(btf, 9);
 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "e1", "enum_name");
 ASSERT_EQ(btf_kind(t), BTF_KIND_ENUM, "enum_kind");
 ASSERT_EQ(btf_vlen(t), 2, "enum_vlen");
 ASSERT_EQ(t->size, 4, "enum_sz");
 v = btf_enum(t) + 0;
 ASSERT_STREQ(btf__str_by_offset(btf, v->name_off), "v1", "v1_name");
 ASSERT_EQ(v->val, 1, "v1_val");
 v = btf_enum(t) + 1;
 ASSERT_STREQ(btf__str_by_offset(btf, v->name_off), "v2", "v2_name");
 ASSERT_EQ(v->val, 2, "v2_val");
 ASSERT_STREQ(btf_type_raw_dump(btf, 9),
       "[9] ENUM 'e1' encoding=UNSIGNED size=4 vlen=2\n"
       "\t'v1' val=1\n"
       "\t'v2' val=2", "raw_dump");

 /* FWDs */
 id = btf__add_fwd(btf, "struct_fwd", BTF_FWD_STRUCT);
 ASSERT_EQ(id, 10, "struct_fwd_id");
 t = btf__type_by_id(btf, 10);
 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "struct_fwd", "fwd_name");
 ASSERT_EQ(btf_kind(t), BTF_KIND_FWD, "fwd_kind");
 ASSERT_EQ(btf_kflag(t), 0, "fwd_kflag");
 ASSERT_STREQ(btf_type_raw_dump(btf, 10),
       "[10] FWD 'struct_fwd' fwd_kind=struct", "raw_dump");

 id = btf__add_fwd(btf, "union_fwd", BTF_FWD_UNION);
 ASSERT_EQ(id, 11, "union_fwd_id");
 t = btf__type_by_id(btf, 11);
 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "union_fwd", "fwd_name");
 ASSERT_EQ(btf_kind(t), BTF_KIND_FWD, "fwd_kind");
 ASSERT_EQ(btf_kflag(t), 1, "fwd_kflag");
 ASSERT_STREQ(btf_type_raw_dump(btf, 11),
       "[11] FWD 'union_fwd' fwd_kind=union", "raw_dump");

 id = btf__add_fwd(btf, "enum_fwd", BTF_FWD_ENUM);
 ASSERT_EQ(id, 12, "enum_fwd_id");
 t = btf__type_by_id(btf, 12);
 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "enum_fwd", "fwd_name");
 ASSERT_EQ(btf_kind(t), BTF_KIND_ENUM, "enum_fwd_kind");
 ASSERT_EQ(btf_vlen(t), 0, "enum_fwd_kind");
 ASSERT_EQ(t->size, 4, "enum_fwd_sz");
 ASSERT_STREQ(btf_type_raw_dump(btf, 12),
       "[12] ENUM 'enum_fwd' encoding=UNSIGNED size=4 vlen=0", "raw_dump");

 /* TYPEDEF */
 id = btf__add_typedef(btf, "typedef1", 1);
 ASSERT_EQ(id, 13, "typedef_fwd_id");
 t = btf__type_by_id(btf, 13);
 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "typedef1", "typedef_name");
 ASSERT_EQ(btf_kind(t), BTF_KIND_TYPEDEF, "typedef_kind");
 ASSERT_EQ(t->type, 1, "typedef_type");
 ASSERT_STREQ(btf_type_raw_dump(btf, 13),
       "[13] TYPEDEF 'typedef1' type_id=1", "raw_dump");

 /* FUNC & FUNC_PROTO */
 id = btf__add_func(btf, "func1", BTF_FUNC_GLOBAL, 15);
 ASSERT_EQ(id, 14, "func_id");
 t = btf__type_by_id(btf, 14);
 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "func1", "func_name");
 ASSERT_EQ(t->type, 15, "func_type");
 ASSERT_EQ(btf_kind(t), BTF_KIND_FUNC, "func_kind");
 ASSERT_EQ(btf_vlen(t), BTF_FUNC_GLOBAL, "func_vlen");
 ASSERT_STREQ(btf_type_raw_dump(btf, 14),
       "[14] FUNC 'func1' type_id=15 linkage=global", "raw_dump");

 id = btf__add_func_proto(btf, 1);
 ASSERT_EQ(id, 15, "func_proto_id");
 err = btf__add_func_param(btf, "p1", 1);
 ASSERT_OK(err, "p1_res");
 err = btf__add_func_param(btf, "p2", 2);
 ASSERT_OK(err, "p2_res");

 t = btf__type_by_id(btf, 15);
 ASSERT_EQ(btf_kind(t), BTF_KIND_FUNC_PROTO, "func_proto_kind");
 ASSERT_EQ(btf_vlen(t), 2, "func_proto_vlen");
 ASSERT_EQ(t->type, 1, "func_proto_ret_type");
 p = btf_params(t) + 0;
 ASSERT_STREQ(btf__str_by_offset(btf, p->name_off), "p1", "p1_name");
 ASSERT_EQ(p->type, 1, "p1_type");
 p = btf_params(t) + 1;
 ASSERT_STREQ(btf__str_by_offset(btf, p->name_off), "p2", "p2_name");
 ASSERT_EQ(p->type, 2, "p2_type");
 ASSERT_STREQ(btf_type_raw_dump(btf, 15),
       "[15] FUNC_PROTO '(anon)' ret_type_id=1 vlen=2\n"
       "\t'p1' type_id=1\n"
       "\t'p2' type_id=2", "raw_dump");

 /* VAR */
 id = btf__add_var(btf, "var1", BTF_VAR_GLOBAL_ALLOCATED, 1);
 ASSERT_EQ(id, 16, "var_id");
 t = btf__type_by_id(btf, 16);
 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "var1", "var_name");
 ASSERT_EQ(btf_kind(t), BTF_KIND_VAR, "var_kind");
 ASSERT_EQ(t->type, 1, "var_type");
 ASSERT_EQ(btf_var(t)->linkage, BTF_VAR_GLOBAL_ALLOCATED, "var_type");
 ASSERT_STREQ(btf_type_raw_dump(btf, 16),
       "[16] VAR 'var1' type_id=1, linkage=global-alloc", "raw_dump");

 /* DATASECT */
 id = btf__add_datasec(btf, "datasec1", 12);
 ASSERT_EQ(id, 17, "datasec_id");
 err = btf__add_datasec_var_info(btf, 1, 4, 8);
 ASSERT_OK(err, "v1_res");

 t = btf__type_by_id(btf, 17);
 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "datasec1", "datasec_name");
 ASSERT_EQ(t->size, 12, "datasec_sz");
 ASSERT_EQ(btf_kind(t), BTF_KIND_DATASEC, "datasec_kind");
 ASSERT_EQ(btf_vlen(t), 1, "datasec_vlen");
 vi = btf_var_secinfos(t) + 0;
 ASSERT_EQ(vi->type, 1, "v1_type");
 ASSERT_EQ(vi->offset, 4, "v1_off");
 ASSERT_EQ(vi->size, 8, "v1_sz");
 ASSERT_STREQ(btf_type_raw_dump(btf, 17),
       "[17] DATASEC 'datasec1' size=12 vlen=1\n"
       "\ttype_id=1 offset=4 size=8", "raw_dump");

 /* DECL_TAG */
 id = btf__add_decl_tag(btf, "tag1", 16, -1);
 ASSERT_EQ(id, 18, "tag_id");
 t = btf__type_by_id(btf, 18);
 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "tag1", "tag_value");
 ASSERT_EQ(btf_kind(t), BTF_KIND_DECL_TAG, "tag_kind");
 ASSERT_EQ(t->type, 16, "tag_type");
 ASSERT_EQ(btf_decl_tag(t)->component_idx, -1, "tag_component_idx");
 ASSERT_STREQ(btf_type_raw_dump(btf, 18),
       "[18] DECL_TAG 'tag1' type_id=16 component_idx=-1", "raw_dump");

 id = btf__add_decl_tag(btf, "tag2", 14, 1);
 ASSERT_EQ(id, 19, "tag_id");
 t = btf__type_by_id(btf, 19);
 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "tag2", "tag_value");
 ASSERT_EQ(btf_kind(t), BTF_KIND_DECL_TAG, "tag_kind");
 ASSERT_EQ(t->type, 14, "tag_type");
 ASSERT_EQ(btf_decl_tag(t)->component_idx, 1, "tag_component_idx");
 ASSERT_STREQ(btf_type_raw_dump(btf, 19),
       "[19] DECL_TAG 'tag2' type_id=14 component_idx=1", "raw_dump");

 /* TYPE_TAG */
 id = btf__add_type_tag(btf, "tag1", 1);
 ASSERT_EQ(id, 20, "tag_id");
 t = btf__type_by_id(btf, 20);
 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "tag1", "tag_value");
 ASSERT_EQ(btf_kind(t), BTF_KIND_TYPE_TAG, "tag_kind");
 ASSERT_EQ(t->type, 1, "tag_type");
 ASSERT_STREQ(btf_type_raw_dump(btf, 20),
       "[20] TYPE_TAG 'tag1' type_id=1", "raw_dump");

 /* ENUM64 */
 id = btf__add_enum64(btf, "e1", 8, true);
 ASSERT_EQ(id, 21, "enum64_id");
 err = btf__add_enum64_value(btf, "v1", -1);
 ASSERT_OK(err, "v1_res");
 err = btf__add_enum64_value(btf, "v2", 0x123456789); /* 4886718345 */
 ASSERT_OK(err, "v2_res");
 t = btf__type_by_id(btf, 21);
 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "e1", "enum64_name");
 ASSERT_EQ(btf_kind(t), BTF_KIND_ENUM64, "enum64_kind");
 ASSERT_EQ(btf_vlen(t), 2, "enum64_vlen");
 ASSERT_EQ(t->size, 8, "enum64_sz");
 v64 = btf_enum64(t) + 0;
 ASSERT_STREQ(btf__str_by_offset(btf, v64->name_off), "v1", "v1_name");
 ASSERT_EQ(v64->val_hi32, 0xffffffff, "v1_val");
 ASSERT_EQ(v64->val_lo32, 0xffffffff, "v1_val");
 v64 = btf_enum64(t) + 1;
 ASSERT_STREQ(btf__str_by_offset(btf, v64->name_off), "v2", "v2_name");
 ASSERT_EQ(v64->val_hi32, 0x1, "v2_val");
 ASSERT_EQ(v64->val_lo32, 0x23456789, "v2_val");
 ASSERT_STREQ(btf_type_raw_dump(btf, 21),
       "[21] ENUM64 'e1' encoding=SIGNED size=8 vlen=2\n"
       "\t'v1' val=-1\n"
       "\t'v2' val=4886718345", "raw_dump");

 id = btf__add_enum64(btf, "e1", 8, false);
 ASSERT_EQ(id, 22, "enum64_id");
 err = btf__add_enum64_value(btf, "v1", 0xffffffffFFFFFFFF); /* 18446744073709551615 */
 ASSERT_OK(err, "v1_res");
 t = btf__type_by_id(btf, 22);
 ASSERT_STREQ(btf__str_by_offset(btf, t->name_off), "e1", "enum64_name");
 ASSERT_EQ(btf_kind(t), BTF_KIND_ENUM64, "enum64_kind");
 ASSERT_EQ(btf_vlen(t), 1, "enum64_vlen");
 ASSERT_EQ(t->size, 8, "enum64_sz");
 v64 = btf_enum64(t) + 0;
 ASSERT_STREQ(btf__str_by_offset(btf, v64->name_off), "v1", "v1_name");
 ASSERT_EQ(v64->val_hi32, 0xffffffff, "v1_val");
 ASSERT_EQ(v64->val_lo32, 0xffffffff, "v1_val");
 ASSERT_STREQ(btf_type_raw_dump(btf, 22),
       "[22] ENUM64 'e1' encoding=UNSIGNED size=8 vlen=1\n"
       "\t'v1' val=18446744073709551615", "raw_dump");
}

static void test_btf_add()
{
 struct btf *btf;

 btf = btf__new_empty();
 if (!ASSERT_OK_PTR(btf, "new_empty"))
  return;

 gen_btf(btf);

 VALIDATE_RAW_BTF(
  btf,
  "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
  "[2] PTR '(anon)' type_id=1",
  "[3] CONST '(anon)' type_id=5",
  "[4] VOLATILE '(anon)' type_id=3",
  "[5] RESTRICT '(anon)' type_id=4",
  "[6] ARRAY '(anon)' type_id=2 index_type_id=1 nr_elems=10",
  "[7] STRUCT 's1' size=8 vlen=2\n"
  "\t'f1' type_id=1 bits_offset=0\n"
  "\t'f2' type_id=1 bits_offset=32 bitfield_size=16",
  "[8] UNION 'u1' size=8 vlen=1\n"
  "\t'f1' type_id=1 bits_offset=0 bitfield_size=16",
  "[9] ENUM 'e1' encoding=UNSIGNED size=4 vlen=2\n"
  "\t'v1' val=1\n"
  "\t'v2' val=2",
  "[10] FWD 'struct_fwd' fwd_kind=struct",
  "[11] FWD 'union_fwd' fwd_kind=union",
  "[12] ENUM 'enum_fwd' encoding=UNSIGNED size=4 vlen=0",
  "[13] TYPEDEF 'typedef1' type_id=1",
  "[14] FUNC 'func1' type_id=15 linkage=global",
  "[15] FUNC_PROTO '(anon)' ret_type_id=1 vlen=2\n"
  "\t'p1' type_id=1\n"
  "\t'p2' type_id=2",
  "[16] VAR 'var1' type_id=1, linkage=global-alloc",
  "[17] DATASEC 'datasec1' size=12 vlen=1\n"
  "\ttype_id=1 offset=4 size=8",
  "[18] DECL_TAG 'tag1' type_id=16 component_idx=-1",
  "[19] DECL_TAG 'tag2' type_id=14 component_idx=1",
  "[20] TYPE_TAG 'tag1' type_id=1",
  "[21] ENUM64 'e1' encoding=SIGNED size=8 vlen=2\n"
  "\t'v1' val=-1\n"
  "\t'v2' val=4886718345",
  "[22] ENUM64 'e1' encoding=UNSIGNED size=8 vlen=1\n"
  "\t'v1' val=18446744073709551615");

 btf__free(btf);
}

static void test_btf_add_btf()
{
 struct btf *btf1 = NULL, *btf2 = NULL;
 int id;

 btf1 = btf__new_empty();
 if (!ASSERT_OK_PTR(btf1, "btf1"))
  return;

 btf2 = btf__new_empty();
 if (!ASSERT_OK_PTR(btf2, "btf2"))
  goto cleanup;

 gen_btf(btf1);
 gen_btf(btf2);

 id = btf__add_btf(btf1, btf2);
 if (!ASSERT_EQ(id, 23, "id"))
  goto cleanup;

 VALIDATE_RAW_BTF(
  btf1,
  "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
  "[2] PTR '(anon)' type_id=1",
  "[3] CONST '(anon)' type_id=5",
  "[4] VOLATILE '(anon)' type_id=3",
  "[5] RESTRICT '(anon)' type_id=4",
  "[6] ARRAY '(anon)' type_id=2 index_type_id=1 nr_elems=10",
  "[7] STRUCT 's1' size=8 vlen=2\n"
  "\t'f1' type_id=1 bits_offset=0\n"
  "\t'f2' type_id=1 bits_offset=32 bitfield_size=16",
  "[8] UNION 'u1' size=8 vlen=1\n"
  "\t'f1' type_id=1 bits_offset=0 bitfield_size=16",
  "[9] ENUM 'e1' encoding=UNSIGNED size=4 vlen=2\n"
  "\t'v1' val=1\n"
  "\t'v2' val=2",
  "[10] FWD 'struct_fwd' fwd_kind=struct",
  "[11] FWD 'union_fwd' fwd_kind=union",
  "[12] ENUM 'enum_fwd' encoding=UNSIGNED size=4 vlen=0",
  "[13] TYPEDEF 'typedef1' type_id=1",
  "[14] FUNC 'func1' type_id=15 linkage=global",
  "[15] FUNC_PROTO '(anon)' ret_type_id=1 vlen=2\n"
  "\t'p1' type_id=1\n"
  "\t'p2' type_id=2",
  "[16] VAR 'var1' type_id=1, linkage=global-alloc",
  "[17] DATASEC 'datasec1' size=12 vlen=1\n"
  "\ttype_id=1 offset=4 size=8",
  "[18] DECL_TAG 'tag1' type_id=16 component_idx=-1",
  "[19] DECL_TAG 'tag2' type_id=14 component_idx=1",
  "[20] TYPE_TAG 'tag1' type_id=1",
  "[21] ENUM64 'e1' encoding=SIGNED size=8 vlen=2\n"
  "\t'v1' val=-1\n"
  "\t'v2' val=4886718345",
  "[22] ENUM64 'e1' encoding=UNSIGNED size=8 vlen=1\n"
  "\t'v1' val=18446744073709551615",

  /* types appended from the second BTF */
  "[23] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED",
  "[24] PTR '(anon)' type_id=23",
  "[25] CONST '(anon)' type_id=27",
  "[26] VOLATILE '(anon)' type_id=25",
  "[27] RESTRICT '(anon)' type_id=26",
  "[28] ARRAY '(anon)' type_id=24 index_type_id=23 nr_elems=10",
  "[29] STRUCT 's1' size=8 vlen=2\n"
  "\t'f1' type_id=23 bits_offset=0\n"
  "\t'f2' type_id=23 bits_offset=32 bitfield_size=16",
  "[30] UNION 'u1' size=8 vlen=1\n"
  "\t'f1' type_id=23 bits_offset=0 bitfield_size=16",
  "[31] ENUM 'e1' encoding=UNSIGNED size=4 vlen=2\n"
  "\t'v1' val=1\n"
  "\t'v2' val=2",
  "[32] FWD 'struct_fwd' fwd_kind=struct",
  "[33] FWD 'union_fwd' fwd_kind=union",
  "[34] ENUM 'enum_fwd' encoding=UNSIGNED size=4 vlen=0",
  "[35] TYPEDEF 'typedef1' type_id=23",
  "[36] FUNC 'func1' type_id=37 linkage=global",
  "[37] FUNC_PROTO '(anon)' ret_type_id=23 vlen=2\n"
  "\t'p1' type_id=23\n"
  "\t'p2' type_id=24",
  "[38] VAR 'var1' type_id=23, linkage=global-alloc",
  "[39] DATASEC 'datasec1' size=12 vlen=1\n"
  "\ttype_id=23 offset=4 size=8",
  "[40] DECL_TAG 'tag1' type_id=38 component_idx=-1",
  "[41] DECL_TAG 'tag2' type_id=36 component_idx=1",
  "[42] TYPE_TAG 'tag1' type_id=23",
  "[43] ENUM64 'e1' encoding=SIGNED size=8 vlen=2\n"
  "\t'v1' val=-1\n"
  "\t'v2' val=4886718345",
  "[44] ENUM64 'e1' encoding=UNSIGNED size=8 vlen=1\n"
  "\t'v1' val=18446744073709551615");

cleanup:
 btf__free(btf1);
 btf__free(btf2);
}

void test_btf_write()
{
 if (test__start_subtest("btf_add"))
  test_btf_add();
 if (test__start_subtest("btf_add_btf"))
  test_btf_add_btf();
}