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//===-- A class for number to string mappings -------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIBC_SRC_SUPPORT_STRING_UTIL_MESSAGE_MAPPER_H
#define LLVM_LIBC_SRC_SUPPORT_STRING_UTIL_MESSAGE_MAPPER_H
#include "src/__support/CPP/array.h"
#include "src/__support/CPP/optional.h"
#include "src/__support/CPP/string_view.h"
#include <stddef.h>
namespace __llvm_libc {
namespace internal {
struct MsgMapping {
int num;
cpp::string_view msg;
constexpr MsgMapping() : num(0), msg() { ; }
constexpr MsgMapping(int init_num, const char *init_msg)
: num(init_num), msg(init_msg) {
;
}
};
template <size_t N> using MsgTable = cpp::array<MsgMapping, N>;
template <size_t N> constexpr size_t total_str_len(const MsgTable<N> &table) {
size_t total = 0;
for (size_t i = 0; i < table.size(); ++i) {
// add 1 for the null terminator.
total += table[i].msg.size() + 1;
}
return total;
}
template <size_t N> constexpr size_t max_key_val(const MsgTable<N> &table) {
int max = 0;
for (size_t i = 0; i < table.size(); ++i) {
if (table[i].num > max) {
max = table[i].num;
}
}
// max will never be negative since the starting value is 0. This is good,
// since it's used as a length.
return static_cast<size_t>(max);
}
template <size_t ARR_SIZE, size_t TOTAL_STR_LEN> class MessageMapper {
int msg_offsets[ARR_SIZE] = {-1};
char string_array[TOTAL_STR_LEN] = {'\0'};
public:
template <size_t N> constexpr MessageMapper(const MsgTable<N> &table) {
cpp::string_view string_mappings[ARR_SIZE] = {""};
for (size_t i = 0; i < table.size(); ++i)
string_mappings[table[i].num] = table[i].msg;
int string_array_index = 0;
for (size_t cur_num = 0; cur_num < ARR_SIZE; ++cur_num) {
if (string_mappings[cur_num].size() != 0) {
msg_offsets[cur_num] = string_array_index;
// No need to replace with proper strcpy, this is evaluated at compile
// time.
for (size_t i = 0; i < string_mappings[cur_num].size() + 1;
++i, ++string_array_index) {
string_array[string_array_index] = string_mappings[cur_num][i];
}
} else {
msg_offsets[cur_num] = -1;
}
}
}
cpp::optional<cpp::string_view> get_str(int num) const {
if (num >= 0 && static_cast<size_t>(num) < ARR_SIZE &&
msg_offsets[num] != -1) {
return {string_array + msg_offsets[num]};
} else {
return cpp::optional<cpp::string_view>();
}
}
};
template <size_t N1, size_t N2>
constexpr MsgTable<N1 + N2> operator+(const MsgTable<N1> &t1,
const MsgTable<N2> &t2) {
MsgTable<N1 + N2> res{};
for (size_t i = 0; i < N1; ++i)
res[i] = t1[i];
for (size_t i = 0; i < N2; ++i)
res[N1 + i] = t2[i];
return res;
}
} // namespace internal
} // namespace __llvm_libc
#endif // LLVM_LIBC_SRC_SUPPORT_STRING_UTIL_MESSAGE_MAPPER_H
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