1 /*
2 * Copyright (c) 2024 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #ifndef DFX_LOG_PUBLIC_H
17 #define DFX_LOG_PUBLIC_H
18
19 #include <array>
20
21 #ifndef is_ohos_lite
22 namespace OHOS {
23 namespace HiviewDFX {
24 template<typename I, typename O>
Copy(I first,I last,O result)25 constexpr void Copy(I first, I last, O result)
26 {
27 while (first != last) {
28 *result++ = *first++;
29 }
30 }
31
32 template<typename LHS, typename RHS>
ConcatStr(LHS && lhs,RHS && rhs)33 constexpr auto ConcatStr(LHS&& lhs, RHS&& rhs)
34 {
35 std::array<char, sizeof(lhs) + sizeof(rhs) - 1> res {};
36 std::size_t i = 0;
37 for (auto it = std::begin(lhs); it != std::end(lhs) && *it; ++it) {
38 res[i++] = *it;
39 }
40 for (auto it = std::begin(rhs); it != std::end(rhs) && *it; ++it) {
41 res[i++] = *it;
42 }
43 return res;
44 }
45
46 // 编译时计算: 直接得到func<line>:字符串，避免运行时格式化开销
47 template<std::size_t N, int... D>
48 struct NumStr : NumStr<N / 10, N % 10, D...> { // 10 : decimal
49 };
50
51 template<int ...D>
52 struct NumStr<0, D...> {
53 static_assert(((D >= 0 && D <= 9) && ...)); // 9 : decimal
54 constexpr static std::size_t len = sizeof...(D);
55 constexpr static char str[] { D + '0'... };
56 };
57
58 template<char... Cs>
59 struct CharList {
60 static constexpr std::array value { Cs..., '\0'};
61 };
62
63 // 编译时计算: 字符串替换 %d -> %{public}d
64 // ohos默认hilog打印<private>而不是具体值
65 template<typename In, typename Out = OHOS::HiviewDFX::CharList<>>
66 struct FmtToPublic {
67 static constexpr auto value = Out::value;
68 };
69
70 template<char C, char... Cs, char... O>
71 struct FmtToPublic<CharList<C, Cs...>, CharList<O...>> : FmtToPublic<CharList<Cs...>, CharList<O..., C>> {};
72
73 // case: %{, skip
74 template<char... Cs, char... O>
75 struct FmtToPublic<CharList<'%', '{', Cs...>, CharList<O...>>
76 : FmtToPublic<CharList<Cs...>, CharList<O..., '%', '{'>> {};
77
78 // case: %%, skip
79 template<char... Cs, char... O>
80 struct FmtToPublic<CharList<'%', '%', Cs...>, CharList<O...>>
81 : FmtToPublic<CharList<Cs...>, CharList<O..., '%', '%'>> {};
82
83 // case: %d, %u, add {public}
84 template<char... Cs, char... O>
85 struct FmtToPublic<CharList<'%', Cs...>, CharList<O...>>
86 : FmtToPublic<CharList<Cs...>, CharList<O..., '%', '{', 'p', 'u', 'b', 'l', 'i', 'c', '}'>> {};
87 } // nameapace HiviewDFX
88 } // nameapace OHOS
89
90 #pragma clang diagnostic push
91 #pragma clang diagnostic ignored "-Wgnu-string-literal-operator-template"
92 template<typename CharT, CharT... Cs>
93 constexpr auto operator"" _DfxToPublic()
94 {
95 return OHOS::HiviewDFX::FmtToPublic<OHOS::HiviewDFX::CharList<Cs...>>::value;
96 };
97 #pragma clang diagnostic pop
98 #endif // is_ohos_lite
99 #endif