ceph/src/boost/boost/stacktrace/detail/to_hex_array.hpp

   1 // Copyright Antony Polukhin, 2016-2020.
   2 //
   3 // Distributed under the Boost Software License, Version 1.0. (See
   4 // accompanying file LICENSE_1_0.txt or copy at
   5 // http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #ifndef BOOST_STACKTRACE_DETAIL_TO_HEX_ARRAY_HPP
   8 #define BOOST_STACKTRACE_DETAIL_TO_HEX_ARRAY_HPP
   9
  10 #include <boost/config.hpp>
  11 #ifdef BOOST_HAS_PRAGMA_ONCE
  12 #   pragma once
  13 #endif
  14
  15 #include <boost/array.hpp>
  16 #include <boost/static_assert.hpp>
  17 #include <boost/type_traits/is_pointer.hpp>
  18 #include <boost/type_traits/make_unsigned.hpp>
  19
  20 namespace boost { namespace stacktrace { namespace detail {
  21
  22 BOOST_STATIC_CONSTEXPR char to_hex_array_bytes[] = "0123456789ABCDEF";
  23
  24 template <class T>
  25 inline boost::array<char, 2 + sizeof(void*) * 2 + 1> to_hex_array(T addr) BOOST_NOEXCEPT {
  26     boost::array<char, 2 + sizeof(void*) * 2 + 1> ret = {"0x"};
  27     ret.back() = '\0';
  28     BOOST_STATIC_ASSERT_MSG(!boost::is_pointer<T>::value, "");
  29
  30     const std::size_t s = sizeof(T);
  31
  32     char* out = ret.data() + s * 2 + 1;
  33
  34     for (std::size_t i = 0; i < s; ++i) {
  35         const unsigned char tmp_addr = (addr & 0xFFu);
  36         *out = to_hex_array_bytes[tmp_addr & 0xF];
  37         -- out;
  38         *out = to_hex_array_bytes[tmp_addr >> 4];
  39         -- out;
  40         addr >>= 8;
  41     }
  42
  43     return ret;
  44 }
  45
  46 inline boost::array<char, 2 + sizeof(void*) * 2 + 1> to_hex_array(const void* addr) BOOST_NOEXCEPT {
  47     return to_hex_array(
  48         reinterpret_cast< boost::make_unsigned<std::ptrdiff_t>::type >(addr)
  49     );
  50 }
  51
  52 }}} // namespace boost::stacktrace::detail
  53
  54 #endif // BOOST_STACKTRACE_DETAIL_TO_HEX_ARRAY_HPP