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| 1 | //===-- A class for number to string mappings -------------------*- C++ -*-===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_MESSAGE_MAPPER_H |
| 10 | #define LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_MESSAGE_MAPPER_H |
| 11 | |
| 12 | #include "src/__support/CPP/array.h" |
| 13 | #include "src/__support/CPP/optional.h" |
| 14 | #include "src/__support/CPP/string_view.h" |
| 15 | #include "src/__support/macros/config.h" |
| 16 | #include <stddef.h> |
| 17 | |
| 18 | namespace LIBC_NAMESPACE_DECL { |
| 19 | |
| 20 | struct MsgMapping { |
| 21 | int num; |
| 22 | cpp::string_view msg; |
| 23 | |
| 24 | constexpr MsgMapping() : num(0), msg() { ; } |
| 25 | |
| 26 | constexpr MsgMapping(int init_num, const char *init_msg) |
| 27 | : num(init_num), msg(init_msg) { |
| 28 | ; |
| 29 | } |
| 30 | }; |
| 31 | |
| 32 | template <size_t N> using MsgTable = cpp::array<MsgMapping, N>; |
| 33 | |
| 34 | template <size_t N> constexpr size_t total_str_len(const MsgTable<N> &table) { |
| 35 | size_t total = 0; |
| 36 | for (size_t i = 0; i < table.size(); ++i) { |
| 37 | // add 1 for the null terminator. |
| 38 | total += table[i].msg.size() + 1; |
| 39 | } |
| 40 | return total; |
| 41 | } |
| 42 | |
| 43 | template <size_t N> constexpr size_t max_key_val(const MsgTable<N> &table) { |
| 44 | int max = 0; |
| 45 | for (size_t i = 0; i < table.size(); ++i) { |
| 46 | if (table[i].num > max) { |
| 47 | max = table[i].num; |
| 48 | } |
| 49 | } |
| 50 | // max will never be negative since the starting value is 0. This is good, |
| 51 | // since it's used as a length. |
| 52 | return static_cast<size_t>(max); |
| 53 | } |
| 54 | |
| 55 | template <size_t ARR_SIZE, size_t TOTAL_STR_LEN> class MessageMapper { |
| 56 | int msg_offsets[ARR_SIZE] = {-1}; |
| 57 | char string_array[TOTAL_STR_LEN] = {'\0'}; |
| 58 | |
| 59 | public: |
| 60 | template <size_t N> constexpr MessageMapper(const MsgTable<N> &table) { |
| 61 | cpp::string_view string_mappings[ARR_SIZE] = {""}; |
| 62 | for (size_t i = 0; i < table.size(); ++i) |
| 63 | string_mappings[table[i].num] = table[i].msg; |
| 64 | |
| 65 | int string_array_index = 0; |
| 66 | for (size_t cur_num = 0; cur_num < ARR_SIZE; ++cur_num) { |
| 67 | if (string_mappings[cur_num].size() != 0) { |
| 68 | msg_offsets[cur_num] = string_array_index; |
| 69 | // No need to replace with proper strcpy, this is evaluated at compile |
| 70 | // time. |
| 71 | for (size_t i = 0; i < string_mappings[cur_num].size() + 1; |
| 72 | ++i, ++string_array_index) { |
| 73 | string_array[string_array_index] = string_mappings[cur_num][i]; |
| 74 | } |
| 75 | } else { |
| 76 | msg_offsets[cur_num] = -1; |
| 77 | } |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | cpp::optional<cpp::string_view> get_str(int num) const { |
| 82 | if (num >= 0 && static_cast<size_t>(num) < ARR_SIZE && |
| 83 | msg_offsets[num] != -1) { |
| 84 | return {string_array + msg_offsets[num]}; |
| 85 | } else { |
| 86 | return cpp::optional<cpp::string_view>(); |
| 87 | } |
| 88 | } |
| 89 | }; |
| 90 | |
| 91 | template <size_t N1, size_t N2> |
| 92 | constexpr MsgTable<N1 + N2> operator+(const MsgTable<N1> &t1, |
| 93 | const MsgTable<N2> &t2) { |
| 94 | MsgTable<N1 + N2> res{}; |
| 95 | for (size_t i = 0; i < N1; ++i) |
| 96 | res[i] = t1[i]; |
| 97 | for (size_t i = 0; i < N2; ++i) |
| 98 | res[N1 + i] = t2[i]; |
| 99 | return res; |
| 100 | } |
| 101 | |
| 102 | } // namespace LIBC_NAMESPACE_DECL |
| 103 | |
| 104 | #endif // LLVM_LIBC_SRC___SUPPORT_STRINGUTIL_MESSAGE_MAPPER_H |
| 105 |
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