1/*
2 * Copyright 2015-present Facebook, Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <folly/Demangle.h>
18
19#include <folly/detail/Demangle.h>
20#include <folly/portability/GTest.h>
21
22using folly::demangle;
23
24namespace folly_test {
25struct ThisIsAVeryLongStructureName {};
26} // namespace folly_test
27
28#if FOLLY_DETAIL_HAVE_DEMANGLE_H
29TEST(Demangle, demangle) {
30 char expected[] = "folly_test::ThisIsAVeryLongStructureName";
31 EXPECT_STREQ(
32 expected,
33 demangle(typeid(folly_test::ThisIsAVeryLongStructureName)).c_str());
34
35 {
36 char buf[sizeof(expected)];
37 EXPECT_EQ(
38 sizeof(expected) - 1,
39 demangle(
40 typeid(folly_test::ThisIsAVeryLongStructureName),
41 buf,
42 sizeof(buf)));
43 EXPECT_STREQ(expected, buf);
44
45 EXPECT_EQ(
46 sizeof(expected) - 1,
47 demangle(typeid(folly_test::ThisIsAVeryLongStructureName), buf, 11));
48 EXPECT_STREQ("folly_test", buf);
49 }
50}
51
52#if defined(FOLLY_DEMANGLE_MAX_SYMBOL_SIZE)
53namespace {
54
55template <int I, class T1, class T2>
56struct Node {};
57
58template <int N, int I = 1>
59struct LongSymbol {
60 using arg1 = typename LongSymbol<N / 2, 2 * I>::type;
61 using arg2 = typename LongSymbol<N / 2, 2 * I + 1>::type;
62 using type = Node<I, arg1, arg2>;
63};
64
65template <int I>
66struct LongSymbol<0, I> {
67 using type = void;
68};
69
70} // namespace
71
72TEST(Demangle, LongSymbolFallback) {
73 // The symbol must be at least FOLLY_DEMANGLE_MAX_SYMBOL_SIZE long.
74 using Symbol = LongSymbol<FOLLY_DEMANGLE_MAX_SYMBOL_SIZE>::type;
75 auto name = typeid(Symbol).name();
76
77 EXPECT_STREQ(name, demangle(name).c_str());
78
79 char buf[16];
80 char expected[16];
81 folly::demangle(name, buf, 16);
82 folly::strlcpy(expected, name, 16);
83 EXPECT_STREQ(expected, buf);
84}
85#endif // defined(FOLLY_DEMANGLE_MAX_SYMBOL_SIZE)
86
87#endif // FOLLY_DETAIL_HAVE_DEMANGLE_H
88
89TEST(Demangle, strlcpy) {
90 char buf[6];
91
92 EXPECT_EQ(3, folly::strlcpy(buf, "abc", 6));
93 EXPECT_EQ('\0', buf[3]);
94 EXPECT_EQ("abc", std::string(buf));
95
96 EXPECT_EQ(7, folly::strlcpy(buf, "abcdefg", 3));
97 EXPECT_EQ('\0', buf[2]);
98 EXPECT_EQ("ab", std::string(buf));
99
100 const char* big_string = "abcdefghijklmnop";
101
102 EXPECT_EQ(strlen(big_string), folly::strlcpy(buf, big_string, sizeof(buf)));
103 EXPECT_EQ('\0', buf[5]);
104 EXPECT_EQ("abcde", std::string(buf));
105
106 buf[0] = 'z';
107 EXPECT_EQ(strlen(big_string), folly::strlcpy(buf, big_string, 0));
108 EXPECT_EQ('z', buf[0]); // unchanged, size = 0
109}
110