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Determine TargetTimeScale automatically.

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This commit is contained in:
Thomas Harte 2021-04-04 15:37:07 -04:00
parent 417ece2386
commit 158122fbf4
2 changed files with 15 additions and 7 deletions
ClockReceiver
JustInTime.hpp
Machines/Apple/Macintosh
Macintosh.cpp

20
ClockReceiver/JustInTime.hpp

@ -30,11 +30,9 @@
observer and potentially stop clocking or stop delaying clocking until just-in-time references
as directed.
TODO: can TargetTimeScale be inferred from the argument type of T::run_for?
TODO: incorporate and codify AsyncJustInTimeActor.
*/
template <class T, int multiplier = 1, int divider = 1, class LocalTimeScale = HalfCycles, class TargetTimeScale = LocalTimeScale> class JustInTimeActor:
template <class T, int multiplier = 1, int divider = 1, class LocalTimeScale = HalfCycles> class JustInTimeActor:
public ClockingHint::Observer {
private:
/*!
@ -49,7 +47,7 @@ template <class T, int multiplier = 1, int divider = 1, class LocalTimeScale = H
*/
class SequencePointAwareDeleter {
public:
explicit SequencePointAwareDeleter(JustInTimeActor<T, multiplier, divider, LocalTimeScale, TargetTimeScale> *actor) noexcept
explicit SequencePointAwareDeleter(JustInTimeActor<T, multiplier, divider, LocalTimeScale> *actor) noexcept
: actor_(actor) {}
forceinline void operator ()(const T *const) const {
@ -59,9 +57,19 @@ template <class T, int multiplier = 1, int divider = 1, class LocalTimeScale = H
}
private:
JustInTimeActor<T, multiplier, divider, LocalTimeScale, TargetTimeScale> *const actor_;
JustInTimeActor<T, multiplier, divider, LocalTimeScale> *const actor_;
};
// This block of SFINAE determines whether objects of type T accepts Cycles or HalfCycles.
using HalfRunFor = void (T::*const)(HalfCycles);
static uint8_t half_sig(...);
static uint16_t half_sig(HalfRunFor);
using TargetTimeScale =
std::conditional_t<
sizeof(half_sig(&T::run_for)) == sizeof(uint16_t),
HalfCycles,
Cycles>;
public:
/// Constructs a new JustInTimeActor using the same construction arguments as the included object.
template<typename... Args> JustInTimeActor(Args&&... args) : object_(std::forward<Args>(args)...) {
@ -118,7 +126,7 @@ template <class T, int multiplier = 1, int divider = 1, class LocalTimeScale = H
///
/// Despite being const, this will flush the object and, if relevant, update the next sequence point.
[[nodiscard]] forceinline auto operator -> () const {
auto non_const_this = const_cast<JustInTimeActor<T, multiplier, divider, LocalTimeScale, TargetTimeScale> *>(this);
auto non_const_this = const_cast<JustInTimeActor<T, multiplier, divider, LocalTimeScale> *>(this);
non_const_this->flush();
return std::unique_ptr<const T, SequencePointAwareDeleter>(&object_, SequencePointAwareDeleter(non_const_this));
}

2
Machines/Apple/Macintosh/Macintosh.cpp

@ -647,7 +647,7 @@ template <Analyser::Static::Macintosh::Target::Model model> class ConcreteMachin
return mouse_;
}
using IWMActor = JustInTimeActor<IWM, 1, 1, HalfCycles, Cycles>;
using IWMActor = JustInTimeActor<IWM>;
class VIAPortHandler: public MOS::MOS6522::PortHandler {
public: