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funreg
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Add some concepts to verify types

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error-checking
Clyne 2 years ago
parent 2a5fe35aee
commit 922489447f
1 changed files with 79 additions and 9 deletions
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88
funreg.hpp
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@ -14,17 +14,29 @@
*/
#define FUNREG_ENABLE_EXTERNAL_IO
/**
* Comment to disable compile-time error checks, which are mostly concepts
* to verify proper library usage.
*/
#define FUNREG_ENABLE_ERROR_CHECKS
#include <stdint.h>
#ifdef FUNREG_ENABLE_EXTERNAL_IO
#include <type_traits>
#endif
#ifdef FUNREG_ENABLE_ERROR_CHECKS
#include <concepts>
#endif
namespace fr {
// A utility to measure a bit-mask's offset from bit zero.
template<auto Mask, unsigned int N = 0>
constexpr auto BitOffset = []() constexpr {
requires(std::unsigned_integral<decltype(Mask)> &&
(N < 8 * sizeof(Mask)))
constexpr auto BitOffset = []() constexpr -> unsigned int {
if constexpr (Mask & 1)
return N;
else
@ -41,6 +53,7 @@ constexpr auto BitOffset = []() constexpr {
* structure as a template.
*/
template<typename T, uintptr_t Addr>
requires(std::unsigned_integral<T>)
struct MemoryIO {
using type = T;
constexpr static auto addr = Addr;
@ -60,6 +73,45 @@ struct MemoryIO {
}
};
template<typename T>
concept IsAccess = requires(typename T::type x) {
requires std::same_as<decltype(T::addr), const uintptr_t>;
{T::read()} -> std::same_as<typename T::type>;
{T::write(x)} -> std::same_as<void>;
};
#ifdef FUNREG_ENABLE_EXTERNAL_IO
template<typename Access>
requires IsAccess<Access>
struct Register;
template<typename T>
concept IsRegister = requires {
requires IsAccess<typename T::access>;
requires std::same_as<T, Register<typename T::access>>;
};
#else
template<typename T, uintptr_t Addr>
requires(std::unsigned_integral<T>)
class Register;
template<typename T>
concept IsRegister = requires {
requires std::unsigned_integral<typename T::type>;
requires IsAccess<typename T::Access>;
};
#endif
template<typename Reg, typename Reg::type Mask>
requires IsRegister<Reg>
struct RegisterMask;
template<typename T>
concept IsRegisterMask = requires {
requires IsRegister<typename T::reg>;
requires std::same_as<T, RegisterMask<typename T::reg, T::mask>>;
};
/**
* @struct Register
* @brief Defines a register, given how to access it.
@ -70,16 +122,22 @@ struct MemoryIO {
*/
#ifdef FUNREG_ENABLE_EXTERNAL_IO
template<typename Access>
struct Register {
requires IsAccess<Access>
class Register {
public:
using access = Access;
using T = typename Access::type;
constexpr static auto Addr = Access::addr;
#else
template<typename T, uintptr_t Addr>
struct Register {
using RegAccess = MemoryIO<T, Addr>;
requires(std::unsigned_integral<T>)
class Register {
public:
using Access = MemoryIO<T, Addr>;
#endif // FUNREG_ENABLE_EXTERNAL_IO
using type = T;
/**
* Gets a pointer to the register.
*/
@ -98,6 +156,7 @@ struct Register {
* Sets register bits to '1' according to the given RegisterMasks.
*/
template<typename... Masks>
requires(IsRegisterMask<Masks>, ...)
static void set() {
apply<Masks...>([](auto r, auto m) { return r | m; });
}
@ -113,6 +172,7 @@ struct Register {
* Clears register bits to '0' according to the given RegisterMasks.
*/
template<typename... Masks>
requires(IsRegisterMask<Masks>, ...)
static void clear() {
apply<Masks...>([](auto r, auto m) { return r & ~m; });
}
@ -128,6 +188,7 @@ struct Register {
* Toggles bits in the register according to the given RegisterMasks.
*/
template<typename... Masks>
requires(IsRegisterMask<Masks>, ...)
static void toggle() {
apply<Masks...>([](auto r, auto m) { return r ^m; });
}
@ -145,6 +206,7 @@ struct Register {
* If no masks are given, all register bits are returned.
*/
template<typename... Masks>
requires(IsRegisterMask<Masks>, ...)
static auto read() {
if constexpr (sizeof...(Masks) > 0)
return read() & mergeMasks<Masks...>();
@ -157,6 +219,7 @@ struct Register {
* If no masks are given, tests if the register has a non-zero value.
*/
template<typename... Masks>
requires(IsRegisterMask<Masks>, ...)
static bool test() {
if constexpr (sizeof...(Masks) > 0) {
auto mask = mergeMasks<Masks...>();
@ -185,13 +248,13 @@ struct Register {
}
}
// Below is meant for internal use only.
private:
// Applies bit-masks to the register through the provided function.
// The provided function receives a pointer to the register's data and a
// bit-mask created by merging all provided bit-masks.
// If no masks are given, a mask selecting all bits is used.
template<typename... Masks>
requires(IsRegisterMask<Masks>, ...)
static void apply(auto fn) {
if constexpr (sizeof...(Masks) > 0) {
auto mask = mergeMasks<Masks...>();
@ -205,6 +268,7 @@ struct Register {
// Takes a list of bit-masks, and returns a merged mask of those which are
// meant for this register.
template<typename... Masks>
requires(IsRegisterMask<Masks>, ...)
static auto mergeMasks() {
if constexpr (sizeof...(Masks) > 0) {
if constexpr ((isThis<typename Masks::reg> | ...)) {
@ -224,20 +288,20 @@ struct Register {
#ifdef FUNREG_ENABLE_EXTERNAL_IO
// Determines if the given register matches this one.
template<typename Reg>
requires(IsRegister<Reg>)
constexpr static bool isThis = [] {
return std::is_same_v<typename Reg::access, access> && Addr == Reg::Addr;
}();
#else
// Determines if the given register matches this one.
template<typename Reg>
requires(IsRegister<Reg>)
constexpr static bool isThis = [] {
return Addr == Reg::Addr;
}();
#endif // FUNREG_ENABLE_EXTERNAL_IO
Register() = delete;
using type = T;
};
/**
@ -251,6 +315,7 @@ struct Register {
* using LED_RED = RegisterMask<GPIO_OUT, (1 << 2)>;
*/
template<typename Reg, typename Reg::type Mask>
requires IsRegister<Reg>
struct RegisterMask
{
using T = typename Reg::type;
@ -373,6 +438,7 @@ struct RegisterMask
* @tparam value The value to be used for the given Mask.
*/
template<typename Mask, Mask::T value>
requires(IsRegisterMask<Mask>)
struct RegisterMaskValue
{
/**
@ -406,6 +472,7 @@ struct RegisterMaskValue
* each register.
*/
template<typename... Registers>
requires(IsRegister<Registers>, ...)
class RegisterGroup
{
public:
@ -415,6 +482,7 @@ public:
* only written once.
*/
template<typename... Masks>
requires(IsRegisterMask<Masks>, ...)
static void set() {
apply<Masks...>([](auto r, auto m) { return r | m; });
}
@ -425,6 +493,7 @@ public:
* Only reads and writes each register once; see set().
*/
template<typename... Masks>
requires(IsRegisterMask<Masks>, ...)
static void clear() {
apply<Masks...>([](auto r, auto m) { return r & ~m; });
}
@ -435,6 +504,7 @@ public:
* Only reads and writes each register once; see set().
*/
template<typename... Masks>
requires(IsRegisterMask<Masks>, ...)
static void toggle() {
apply<Masks...>([](auto r, auto m) { return r ^ m; });
}
@ -465,6 +535,7 @@ private:
* register.
*/
template<typename... RegMasks>
requires(IsRegisterMask<RegMasks>, ...)
constexpr auto Masks = (RegMasks::mask | ...);
#ifdef FUNREG_ENABLE_EXTERNAL_IO
@ -501,4 +572,3 @@ using MemRegister = Register<T, Addr>;
} // namespace fr
#endif // FUNCTIONAL_REGISTER_IO_H

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