mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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329 lines
14 KiB
C++
329 lines
14 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <vapours/common.hpp>
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#include <vapours/assert.hpp>
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namespace ams {
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namespace result::impl {
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class ResultTraits {
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public:
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using BaseType = u32;
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static_assert(std::is_same<BaseType, ::Result>::value, "std::is_same<BaseType, ::Result>::value");
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static constexpr BaseType SuccessValue = BaseType();
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static constexpr BaseType ModuleBits = 9;
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static constexpr BaseType DescriptionBits = 13;
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static constexpr BaseType ReservedBits = 10;
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static_assert(ModuleBits + DescriptionBits + ReservedBits == sizeof(BaseType) * CHAR_BIT, "ModuleBits + DescriptionBits + ReservedBits == sizeof(BaseType) * CHAR_BIT");
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public:
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static constexpr ALWAYS_INLINE BaseType MakeValue(BaseType module, BaseType description) {
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return (module) | (description << ModuleBits);
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}
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template<BaseType module, BaseType description>
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struct MakeStaticValue : public std::integral_constant<BaseType, MakeValue(module, description)> {
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static_assert(module < (1 << ModuleBits), "Invalid Module");
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static_assert(description < (1 << DescriptionBits), "Invalid Description");
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};
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static constexpr ALWAYS_INLINE BaseType GetModuleFromValue(BaseType value) {
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return value & ~(~BaseType() << ModuleBits);
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}
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static constexpr ALWAYS_INLINE BaseType GetDescriptionFromValue(BaseType value) {
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return ((value >> ModuleBits) & ~(~BaseType() << DescriptionBits));
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}
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};
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/* Use CRTP for Results. */
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template<typename Self>
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class ResultBase {
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public:
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using BaseType = typename ResultTraits::BaseType;
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static constexpr BaseType SuccessValue = ResultTraits::SuccessValue;
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public:
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constexpr ALWAYS_INLINE BaseType GetModule() const { return ResultTraits::GetModuleFromValue(static_cast<const Self *>(this)->GetValue()); }
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constexpr ALWAYS_INLINE BaseType GetDescription() const { return ResultTraits::GetDescriptionFromValue(static_cast<const Self *>(this)->GetValue()); }
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};
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class ResultConstructor;
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}
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class ResultSuccess;
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class Result final : public result::impl::ResultBase<Result> {
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friend class ResultConstructor;
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public:
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using Base = typename result::impl::ResultBase<Result>;
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private:
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typename Base::BaseType value;
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private:
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/* TODO: Maybe one-day, the result constructor. */
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public:
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Result() { /* ... */ }
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/* TODO: It sure would be nice to make this private. */
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constexpr Result(typename Base::BaseType v) : value(v) { static_assert(std::is_same<typename Base::BaseType, ::Result>::value); }
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constexpr ALWAYS_INLINE operator ResultSuccess() const;
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NX_CONSTEXPR bool CanAccept(Result) { return true; }
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constexpr ALWAYS_INLINE bool IsSuccess() const { return this->GetValue() == Base::SuccessValue; }
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constexpr ALWAYS_INLINE bool IsFailure() const { return !this->IsSuccess(); }
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constexpr ALWAYS_INLINE typename Base::BaseType GetModule() const { return Base::GetModule(); }
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constexpr ALWAYS_INLINE typename Base::BaseType GetDescription() const { return Base::GetDescription(); }
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constexpr ALWAYS_INLINE typename Base::BaseType GetValue() const { return this->value; }
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};
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static_assert(sizeof(Result) == sizeof(Result::Base::BaseType), "sizeof(Result) == sizeof(Result::Base::BaseType)");
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static_assert(std::is_trivially_destructible<Result>::value, "std::is_trivially_destructible<Result>::value");
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namespace result::impl {
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class ResultConstructor {
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public:
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static constexpr ALWAYS_INLINE Result MakeResult(ResultTraits::BaseType value) {
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return Result(value);
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}
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};
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constexpr ALWAYS_INLINE Result MakeResult(ResultTraits::BaseType value) {
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return ResultConstructor::MakeResult(value);
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}
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}
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class ResultSuccess final : public result::impl::ResultBase<ResultSuccess> {
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public:
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using Base = typename result::impl::ResultBase<ResultSuccess>;
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public:
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constexpr operator Result() const { return result::impl::MakeResult(Base::SuccessValue); }
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NX_CONSTEXPR bool CanAccept(Result result) { return result.IsSuccess(); }
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constexpr ALWAYS_INLINE bool IsSuccess() const { return true; }
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constexpr ALWAYS_INLINE bool IsFailure() const { return !this->IsSuccess(); }
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constexpr ALWAYS_INLINE typename Base::BaseType GetModule() const { return Base::GetModule(); }
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constexpr ALWAYS_INLINE typename Base::BaseType GetDescription() const { return Base::GetDescription(); }
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constexpr ALWAYS_INLINE typename Base::BaseType GetValue() const { return Base::SuccessValue; }
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};
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namespace result::impl {
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NORETURN NOINLINE void OnResultAssertion(const char *file, int line, const char *func, const char *expr, Result result);
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NORETURN NOINLINE void OnResultAssertion(Result result);
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NORETURN NOINLINE void OnResultAbort(const char *file, int line, const char *func, const char *expr, Result result);
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NORETURN NOINLINE void OnResultAbort(Result result);
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}
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constexpr ALWAYS_INLINE Result::operator ResultSuccess() const {
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if (!ResultSuccess::CanAccept(*this)) {
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result::impl::OnResultAbort(*this);
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}
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return ResultSuccess();
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}
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namespace result::impl {
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template<ResultTraits::BaseType _Module, ResultTraits::BaseType _Description>
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class ResultErrorBase : public ResultBase<ResultErrorBase<_Module, _Description>> {
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public:
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using Base = typename result::impl::ResultBase<ResultErrorBase<_Module, _Description>>;
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static constexpr typename Base::BaseType Module = _Module;
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static constexpr typename Base::BaseType Description = _Description;
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static constexpr typename Base::BaseType Value = ResultTraits::MakeStaticValue<Module, Description>::value;
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static_assert(Value != Base::SuccessValue, "Value != Base::SuccessValue");
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public:
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constexpr operator Result() const { return MakeResult(Value); }
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constexpr operator ResultSuccess() const { OnResultAbort(Value); }
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constexpr ALWAYS_INLINE bool IsSuccess() const { return false; }
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constexpr ALWAYS_INLINE bool IsFailure() const { return !this->IsSuccess(); }
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constexpr ALWAYS_INLINE typename Base::BaseType GetValue() const { return Value; }
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};
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template<ResultTraits::BaseType _Module, ResultTraits::BaseType DescStart, ResultTraits::BaseType DescEnd>
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class ResultErrorRangeBase {
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public:
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static constexpr ResultTraits::BaseType Module = _Module;
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static constexpr ResultTraits::BaseType DescriptionStart = DescStart;
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static constexpr ResultTraits::BaseType DescriptionEnd = DescEnd;
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static_assert(DescriptionStart <= DescriptionEnd, "DescriptionStart <= DescriptionEnd");
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static constexpr typename ResultTraits::BaseType StartValue = ResultTraits::MakeStaticValue<Module, DescriptionStart>::value;
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static constexpr typename ResultTraits::BaseType EndValue = ResultTraits::MakeStaticValue<Module, DescriptionEnd>::value;
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public:
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static constexpr bool Includes(Result result) {
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return result.GetModule() == Module && DescriptionStart <= result.GetDescription() && result.GetDescription() <= DescriptionEnd;
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}
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};
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}
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}
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/* Macros for defining new results. */
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#define R_DEFINE_NAMESPACE_RESULT_MODULE(value) namespace impl::result { static constexpr inline ::ams::result::impl::ResultTraits::BaseType ResultModuleId = value; }
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#define R_CURRENT_NAMESPACE_RESULT_MODULE impl::result::ResultModuleId
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#define R_NAMESPACE_MODULE_ID(nmspc) nmspc::R_CURRENT_NAMESPACE_RESULT_MODULE
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#define R_MAKE_NAMESPACE_RESULT(nmspc, desc) static_cast<::ams::Result>(::ams::result::impl::ResultTraits::MakeValue(R_NAMESPACE_MODULE_ID(nmspc), desc))
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#define R_DEFINE_ERROR_RESULT_IMPL(name, desc_start, desc_end) \
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class Result##name final : public ::ams::result::impl::ResultErrorBase<R_CURRENT_NAMESPACE_RESULT_MODULE, desc_start>, public ::ams::result::impl::ResultErrorRangeBase<R_CURRENT_NAMESPACE_RESULT_MODULE, desc_start, desc_end> {}
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#define R_DEFINE_ABSTRACT_ERROR_RESULT_IMPL(name, desc_start, desc_end) \
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class Result##name final : public ::ams::result::impl::ResultErrorRangeBase<R_CURRENT_NAMESPACE_RESULT_MODULE, desc_start, desc_end> {}
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#define R_DEFINE_ERROR_RESULT(name, desc) R_DEFINE_ERROR_RESULT_IMPL(name, desc, desc)
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#define R_DEFINE_ERROR_RANGE(name, start, end) R_DEFINE_ERROR_RESULT_IMPL(name, start, end)
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#define R_DEFINE_ABSTRACT_ERROR_RESULT(name, desc) R_DEFINE_ABSTRACT_ERROR_RESULT_IMPL(name, desc, desc)
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#define R_DEFINE_ABSTRACT_ERROR_RANGE(name, start, end) R_DEFINE_ABSTRACT_ERROR_RESULT_IMPL(name, start, end)
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/* Remove libnx macros, replace with our own. */
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#ifndef R_SUCCEEDED
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#error "R_SUCCEEDED not defined."
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#endif
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#undef R_SUCCEEDED
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#ifndef R_FAILED
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#error "R_FAILED not defined"
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#endif
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#undef R_FAILED
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#define R_SUCCEEDED(res) (static_cast<::ams::Result>(res).IsSuccess())
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#define R_FAILED(res) (static_cast<::ams::Result>(res).IsFailure())
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/// Evaluates an expression that returns a result, and returns the result if it would fail.
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#define R_TRY(res_expr) \
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({ \
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const auto _tmp_r_try_rc = (res_expr); \
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if (R_FAILED(_tmp_r_try_rc)) { \
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return _tmp_r_try_rc; \
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} \
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})
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#ifdef AMS_ENABLE_DEBUG_PRINT
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#define AMS_CALL_ON_RESULT_ASSERTION_IMPL(cond, val) ::ams::result::impl::OnResultAssertion(__FILE__, __LINE__, __PRETTY_FUNCTION__, cond, val)
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#define AMS_CALL_ON_RESULT_ABORT_IMPL(cond, val) ::ams::result::impl::OnResultAbort(__FILE__, __LINE__, __PRETTY_FUNCTION__, cond, val)
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#else
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#define AMS_CALL_ON_RESULT_ASSERTION_IMPL(cond, val) ::ams::result::impl::OnResultAssertion("", 0, "", "", val)
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#define AMS_CALL_ON_RESULT_ABORT_IMPL(cond, val) ::ams::result::impl::OnResultAbort("", 0, "", "", val)
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#endif
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/// Evaluates an expression that returns a result, and asserts the result if it would fail.
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#ifdef AMS_ENABLE_ASSERTIONS
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#define R_ASSERT(res_expr) \
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({ \
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const auto _tmp_r_assert_rc = (res_expr); \
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if (AMS_UNLIKELY(R_FAILED(_tmp_r_assert_rc))) { \
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AMS_CALL_ON_RESULT_ASSERTION_IMPL(#res_expr, _tmp_r_assert_rc); \
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} \
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})
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#else
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#define R_ASSERT(res_expr) AMS_UNUSED((res_expr));
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#endif
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/// Evaluates an expression that returns a result, and aborts if the result would fail.
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#define R_ABORT_UNLESS(res_expr) \
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({ \
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const auto _tmp_r_abort_rc = (res_expr); \
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if (AMS_UNLIKELY(R_FAILED(_tmp_r_abort_rc))) { \
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AMS_CALL_ON_RESULT_ABORT_IMPL(#res_expr, _tmp_r_abort_rc); \
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} \
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})
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/// Evaluates a boolean expression, and returns a result unless that expression is true.
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#define R_UNLESS(expr, res) \
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({ \
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if (!(expr)) { \
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return static_cast<::ams::Result>(res); \
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} \
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})
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/// Evaluates a boolean expression, and succeeds if that expression is true.
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#define R_SUCCEED_IF(expr) R_UNLESS(!(expr), ResultSuccess())
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/// Helpers for pattern-matching on a result expression, if the result would fail.
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#define R_CURRENT_RESULT _tmp_r_current_result
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#define R_TRY_CATCH(res_expr) \
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({ \
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const auto R_CURRENT_RESULT = (res_expr); \
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if (R_FAILED(R_CURRENT_RESULT)) { \
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if (false)
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namespace ams::result::impl {
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template<typename... Rs>
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constexpr ALWAYS_INLINE bool AnyIncludes(Result result) {
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return (Rs::Includes(result) || ...);
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}
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}
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#define R_CATCH(...) \
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} else if (::ams::result::impl::AnyIncludes<__VA_ARGS__>(R_CURRENT_RESULT)) { \
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if (true)
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#define R_CATCH_MODULE(__module__) \
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} else if ((R_CURRENT_RESULT).GetModule() == ::ams::R_NAMESPACE_MODULE_ID(__module__)) { \
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if (true)
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#define R_CONVERT(catch_type, convert_type) \
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R_CATCH(catch_type) { return static_cast<::ams::Result>(convert_type); }
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#define R_CATCH_ALL() \
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} else if (R_FAILED(R_CURRENT_RESULT)) { \
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if (true)
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#define R_CONVERT_ALL(convert_type) \
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R_CATCH_ALL() { return static_cast<::ams::Result>(convert_type); }
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#define R_CATCH_RETHROW(catch_type) \
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R_CONVERT(catch_type, R_CURRENT_RESULT)
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#define R_END_TRY_CATCH \
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else if (R_FAILED(R_CURRENT_RESULT)) { \
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return R_CURRENT_RESULT; \
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} \
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} \
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})
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#define R_END_TRY_CATCH_WITH_ASSERT \
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else { \
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R_ASSERT(R_CURRENT_RESULT); \
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} \
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} \
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})
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#define R_END_TRY_CATCH_WITH_ABORT_UNLESS \
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else { \
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R_ABORT_UNLESS(R_CURRENT_RESULT); \
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} \
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} \
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})
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