forked from suyu/suyu
Merge pull request #9034 from liamwhite/result-macros
kernel: add expanded result macros
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commit
64c2ccb0cb
1 changed files with 114 additions and 6 deletions
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@ -5,6 +5,7 @@
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#include "common/assert.h"
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#include "common/bit_field.h"
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#include "common/common_funcs.h"
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#include "common/common_types.h"
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#include "common/expected.h"
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@ -130,6 +131,10 @@ union Result {
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[[nodiscard]] constexpr bool IsError() const {
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return !IsSuccess();
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}
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[[nodiscard]] constexpr bool IsFailure() const {
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return !IsSuccess();
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}
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};
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static_assert(std::is_trivial_v<Result>);
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@ -349,10 +354,110 @@ private:
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} \
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} while (false)
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#define R_SUCCEEDED(res) (res.IsSuccess())
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#define R_SUCCEEDED(res) (static_cast<Result>(res).IsSuccess())
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#define R_FAILED(res) (static_cast<Result>(res).IsFailure())
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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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namespace ResultImpl {
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template <auto EvaluateResult, class F>
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class ScopedResultGuard {
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YUZU_NON_COPYABLE(ScopedResultGuard);
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YUZU_NON_MOVEABLE(ScopedResultGuard);
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private:
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Result& m_ref;
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F m_f;
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public:
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constexpr ScopedResultGuard(Result& ref, F f) : m_ref(ref), m_f(std::move(f)) {}
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constexpr ~ScopedResultGuard() {
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if (EvaluateResult(m_ref)) {
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m_f();
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}
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}
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};
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template <auto EvaluateResult>
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class ResultReferenceForScopedResultGuard {
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private:
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Result& m_ref;
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public:
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constexpr ResultReferenceForScopedResultGuard(Result& r) : m_ref(r) {}
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constexpr operator Result&() const {
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return m_ref;
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}
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};
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template <auto EvaluateResult, typename F>
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constexpr ScopedResultGuard<EvaluateResult, F> operator+(
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ResultReferenceForScopedResultGuard<EvaluateResult> ref, F&& f) {
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return ScopedResultGuard<EvaluateResult, F>(static_cast<Result&>(ref), std::forward<F>(f));
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}
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constexpr bool EvaluateResultSuccess(const Result& r) {
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return R_SUCCEEDED(r);
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}
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constexpr bool EvaluateResultFailure(const Result& r) {
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return R_FAILED(r);
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}
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template <typename T>
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constexpr void UpdateCurrentResultReference(T result_reference, Result result) {
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ASSERT(false);
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}
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template <>
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constexpr void UpdateCurrentResultReference<Result&>(Result& result_reference, Result result) {
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result_reference = result;
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}
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template <>
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constexpr void UpdateCurrentResultReference<Result>(Result result_reference, Result result) {}
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} // namespace ResultImpl
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#define DECLARE_CURRENT_RESULT_REFERENCE_AND_STORAGE(COUNTER_VALUE) \
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[[maybe_unused]] constexpr bool HasPrevRef_##COUNTER_VALUE = \
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std::same_as<decltype(__TmpCurrentResultReference), Result&>; \
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[[maybe_unused]] auto& PrevRef_##COUNTER_VALUE = __TmpCurrentResultReference; \
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[[maybe_unused]] Result __tmp_result_##COUNTER_VALUE = ResultSuccess; \
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Result& __TmpCurrentResultReference = \
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HasPrevRef_##COUNTER_VALUE ? PrevRef_##COUNTER_VALUE : __tmp_result_##COUNTER_VALUE
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#define ON_RESULT_RETURN_IMPL(...) \
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static_assert(std::same_as<decltype(__TmpCurrentResultReference), Result&>); \
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auto RESULT_GUARD_STATE_##__COUNTER__ = \
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ResultImpl::ResultReferenceForScopedResultGuard<__VA_ARGS__>( \
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__TmpCurrentResultReference) + \
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[&]()
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#define ON_RESULT_FAILURE_2 ON_RESULT_RETURN_IMPL(ResultImpl::EvaluateResultFailure)
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#define ON_RESULT_FAILURE \
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DECLARE_CURRENT_RESULT_REFERENCE_AND_STORAGE(__COUNTER__); \
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ON_RESULT_FAILURE_2
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#define ON_RESULT_SUCCESS_2 ON_RESULT_RETURN_IMPL(ResultImpl::EvaluateResultSuccess)
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#define ON_RESULT_SUCCESS \
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DECLARE_CURRENT_RESULT_REFERENCE_AND_STORAGE(__COUNTER__); \
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ON_RESULT_SUCCESS_2
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constexpr inline Result __TmpCurrentResultReference = ResultSuccess;
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/// Returns a result.
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#define R_RETURN(res_expr) \
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{ \
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const Result _tmp_r_throw_rc = (res_expr); \
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ResultImpl::UpdateCurrentResultReference<decltype(__TmpCurrentResultReference)>( \
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__TmpCurrentResultReference, _tmp_r_throw_rc); \
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return _tmp_r_throw_rc; \
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}
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/// Returns ResultSuccess()
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#define R_SUCCEED() R_RETURN(ResultSuccess)
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/// Throws a result.
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#define R_THROW(res_expr) R_RETURN(res_expr)
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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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@ -361,7 +466,7 @@ private:
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if (res.IsError()) { \
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LOG_ERROR(Kernel, "Failed with result: {}", res.raw); \
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} \
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return res; \
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R_THROW(res); \
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} \
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}
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@ -369,7 +474,10 @@ private:
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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 (_tmp_r_try_rc.IsError()) { \
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return _tmp_r_try_rc; \
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if (R_FAILED(_tmp_r_try_rc)) { \
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R_THROW(_tmp_r_try_rc); \
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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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