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Switch to use of __COUNTER__.

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This commit is contained in:
Thomas Harte 2022-05-16 20:38:17 -04:00
parent 3db2de7478
commit e94efe887c
1 changed files with 8 additions and 6 deletions
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14
Processors/68000Mk2/Implementation/68000Mk2Implementation.hpp
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@ -22,7 +22,7 @@ void Processor<BusHandler, dtack_is_implicit, permit_overrun, signal_will_perfor
// Check whether all remaining time has been expended; if so then exit, having set this line up as
// the next resumption point.
#define ConsiderExit() if(time_remaining_ <= HalfCycles(0)) { state_ = __LINE__; return; } [[fallthrough]]; case __LINE__:
#define ConsiderExit() if(time_remaining_ <= HalfCycles(0)) { state_ = __COUNTER__+1; return; } [[fallthrough]]; case __COUNTER__:
// Subtracts `n` half-cycles from `time_remaining_`; if permit_overrun is false, also ConsiderExit()
#define Spend(n) time_remaining_ -= (n); if constexpr (!permit_overrun) ConsiderExit()
@ -48,9 +48,11 @@ void Processor<BusHandler, dtack_is_implicit, permit_overrun, signal_will_perfor
// Additional notes:
//
// Action and all equivalents should be negative values, since the
// switch-for-computed-goto-for-a-coroutine structure uses __LINE__ for
// switch-for-computed-goto-for-a-coroutine structure uses __COUNTER__* for
// its invented entry- and exit-points, meaning that negative numbers are
// the easiest group that is safely definitely never going to collide.
//
// (* an extension supported by at least GCC, Clang and MSVC)
// Some microcycles that will be modified as required and used in the loop below;
@ -77,8 +79,8 @@ void Processor<BusHandler, dtack_is_implicit, permit_overrun, signal_will_perfor
Microcycle awaiting_dtack;
// Spare containers:
uint32_t address; // For an address, where it isn't provideable by reference.
HalfCycles delay; // To receive any additional time added on by calls to perform_bus_operation.
uint32_t address = 0; // For an address, where it isn't provideable by reference.
HalfCycles delay; // To receive any additional time added on by calls to perform_bus_operation.
// Helper macros for common bus transactions:
@ -99,11 +101,11 @@ void Processor<BusHandler, dtack_is_implicit, permit_overrun, signal_will_perfor
if constexpr (!dtack_is_implicit && !dtack_ && !vpa_ && !berr_) { \
awaiting_dtack = x; \
awaiting_dtack.length = HalfCycles(2); \
post_dtack_state_ = __LINE__ + 4; \
post_dtack_state_ = __COUNTER__+1; \
state_ = State::WaitForDTACK; \
break; \
} \
[[fallthrough]]; case __LINE__:
[[fallthrough]]; case __COUNTER__:
// Performs the bus operation provided, which will be one with a
// SelectWord or SelectByte operation, stretching it to match the E