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Types.h
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Types.h
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#ifndef TYPES_H__
#define TYPES_H__
#include <climits>
#include <cstdint>
#include <type_traits>
#include <optional>
#define INDIRECTION0(x, y) x ## y
#define INDIRECTION(x, y) INDIRECTION0(x, y)
namespace forth {
using Address = uint64_t;
using HalfAddress = uint32_t;
using QuarterAddress = uint16_t;
using Integer = int64_t;
using HalfInteger = int32_t;
using QuarterInteger = int16_t;
using Floating = double;
using byte = uint8_t;
static_assert(sizeof(Address) == sizeof(Integer), "Address and integer must be the same size!");
static_assert(sizeof(Integer) == sizeof(Floating), "Integer and Floating must be the same size!");
static_assert((sizeof(Address) / sizeof(QuarterAddress)) == 4, "Number of quarter addresses in an address is not 4!");
static_assert((sizeof(Address) / sizeof(HalfAddress)) == 2, "Number of half addresses in an address is not 2!");
template<typename T>
constexpr auto bitWidth = sizeof(T) * CHAR_BIT;
template<typename T>
constexpr auto quarterBitWidth = bitWidth<T> >> 2;
template<typename T>
constexpr auto halfBitWidth = bitWidth<T> >> 1;
template<typename T>
constexpr auto fullMask = (static_cast<T>(-1));
template<typename T, typename R, T mask, T shift = 0>
constexpr T encodeBits(T value, R newValue) noexcept {
return (value & ~mask) | ((static_cast<T>(newValue) << shift) & mask);
}
template<typename T, typename R>
constexpr T encodeBits(T value, R newValue, T mask, T shift = 0) noexcept {
return (value & ~mask) | ((static_cast<T>(newValue) << shift) & mask);
}
template<typename T, typename R, T mask, T shift = 0>
constexpr R decodeBits(T value) noexcept {
return static_cast<R>((value & mask) >> shift);
}
template<typename T, typename R>
constexpr R decodeBits(T value, T mask, T shift = 0) noexcept {
return static_cast<R>((value & mask) >> shift);
}
constexpr byte getLowerHalf(byte input) noexcept {
return decodeBits<byte, byte, 0x0'F>(input);
}
constexpr byte getLowerHalf(QuarterAddress input) noexcept {
return decodeBits<QuarterAddress, byte, 0x00'FF>(input);
}
constexpr QuarterAddress getLowerHalf(HalfAddress input) noexcept {
return decodeBits<HalfAddress, QuarterAddress, 0x0000'FFFF>(input);
}
constexpr HalfAddress getLowerHalf(Address input) noexcept {
return decodeBits<Address, HalfAddress, 0x0000'0000'FFFF'FFFF>(input);
}
constexpr byte getLowerHalf(QuarterInteger input) noexcept {
return input & 0x00'FF;
}
template<typename T, typename C = byte>
constexpr bool legalValue(T r, T count = T::Count) noexcept {
static_assert(std::is_enum<T>::value, "This is an enum value check!");
static_assert(std::is_integral<C>::value, "C must cast to an integral type");
return static_cast<C>(r) < static_cast<C>(count);
}
template<typename T>
using HalfOf = decltype(getLowerHalf(T(0)));
template<typename T>
using QuarterOf = HalfOf<HalfOf<T>>;
template<typename T>
constexpr auto halfMask = T(getLowerHalf(fullMask<T>));
static_assert(halfMask<QuarterAddress> == 0x00FF, "Illegal halfMask!");
template<typename T>
constexpr auto quarterMask = T(getLowerHalf(getLowerHalf(fullMask<T>)));
static_assert(quarterMask<QuarterAddress> == 0x000F, "Illegal address!");
static_assert(quarterMask<Address> == 0x0000'0000'0000'FFFF, "Illegal quarter mask for Address!");
template<typename T>
constexpr auto lowerHalfMask = halfMask<T>;
template<typename T>
constexpr auto upperHalfMask = halfMask<T> << halfBitWidth<T>;
template<typename T>
constexpr auto lowestQuarterMask = quarterMask<T>;
template<typename T>
constexpr auto lowerQuarterMask = quarterMask<T> << quarterBitWidth<T>;
template<typename T>
constexpr auto higherQuarterMask = quarterMask<T> << (quarterBitWidth<T> * 2);
template<typename T>
constexpr auto highestQuarterMask= quarterMask<T> << (quarterBitWidth<T> * 3);
static_assert(highestQuarterMask<Address> == 0xFFFF'0000'0000'0000, "Highest Quater Mask is wrong!");
template<typename T>
constexpr HalfOf<T> getUpperHalf(T input) noexcept {
return decodeBits<T, HalfOf<T>, upperHalfMask<T>, halfBitWidth<T>>(input);
}
template<typename T>
constexpr QuarterOf<T> getLowestQuarter(T value) noexcept {
return decodeBits<T, QuarterOf<T>, lowestQuarterMask<T>, quarterBitWidth<T> * 0>(value);
}
template<typename T>
constexpr QuarterOf<T> getLowerQuarter(T value) noexcept {
return decodeBits<T, QuarterOf<T>, lowerQuarterMask<T>, quarterBitWidth<T> * 1>(value);
}
template<typename T>
constexpr QuarterOf<T> getHigherQuarter(T value) noexcept {
return decodeBits<T, QuarterOf<T>, higherQuarterMask<T>, quarterBitWidth<T> * 2 >(value);
}
template<typename T>
constexpr QuarterOf<T> getHighestQuarter(T value) noexcept {
return decodeBits<T, QuarterOf<T>, highestQuarterMask<T>, quarterBitWidth<T> * 3>(value);
}
template<typename T>
constexpr T setLowestQuarter(T input, QuarterOf<T> value) noexcept {
return encodeBits<decltype(input), decltype(value), lowestQuarterMask<T>, quarterBitWidth<T> * 0>(input, value);
}
template<typename T>
constexpr T setLowerQuarter(T input, QuarterOf<T> value) noexcept {
return encodeBits<decltype(input), decltype(value), lowerQuarterMask<T>, quarterBitWidth<T> * 1>(input, value);
}
template<typename T>
constexpr T setHigherQuarter(T input, QuarterOf<T> value) noexcept {
return encodeBits<decltype(input), decltype(value), higherQuarterMask<T>, quarterBitWidth<T> * 2>(input, value);
}
template<typename T>
constexpr T setHighestQuarter(T input, QuarterOf<T> value) noexcept {
return encodeBits<decltype(input), decltype(value), highestQuarterMask<T>, quarterBitWidth<T> * 3>(input, value);
}
template<typename T>
constexpr T setFourQuarters(QuarterOf<T> lowest, QuarterOf<T> lower, QuarterOf<T> higher, QuarterOf<T> highest) noexcept {
return setHighestQuarter<T>( setHigherQuarter<T>( setLowerQuarter<T>( setLowestQuarter<T>(T(0), lowest), lower), higher), highest);
}
template<typename T>
constexpr T setUpperHalf(T input, HalfOf<T> value) noexcept {
return encodeBits<T, HalfOf<T>, upperHalfMask<T>, halfBitWidth<T>>(input, value);
}
template<typename T>
constexpr Address setLowerHalf(T input, HalfOf<T>value) noexcept {
return encodeBits<T, HalfOf<T>, lowerHalfMask<T>, halfBitWidth<T>*0>(input, value);
}
template<typename T>
constexpr T setLowerUpperHalves(HalfOf<T> lower, HalfOf<T> upper) noexcept {
return setUpperHalf<T>(setLowerHalf<T>(T(0), lower), upper);
}
template<class... Ts> struct overloaded : Ts... { using Ts::operator()...; };
template<class... Ts> overloaded(Ts...) -> overloaded<Ts...>;
template<typename T>
struct AlwaysFalse : std::false_type { };
QuarterInteger safeExtract(QuarterAddress addr) noexcept;
QuarterAddress safeExtract(QuarterInteger addr) noexcept;
constexpr HalfAddress mask24 = 0x00FF'FFFF;
HalfAddress make24bit(Address input);
constexpr bool outOfRange16(Integer value) noexcept {
constexpr Integer maxRange = 32767;
constexpr Integer minRange = -32768;
return (value > maxRange) || (value < minRange);
}
}
#endif // end TYPES_H__