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Collect up different dispatches.

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This commit is contained in:
Thomas Harte 2023-06-13 15:22:53 -04:00
parent de5ee8f0d0
commit d36a88dd11
3 changed files with 41 additions and 33 deletions
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53
ClockReceiver/RangeDispatcher.hpp
View File

@ -10,9 +10,31 @@
#define RangeDispatcher_hpp
#include <algorithm>
#include <cstdint>
namespace Reflection {
/*!
Calls @c t.dispatch<c>(args...) as efficiently as possible.
*/
template <typename TargetT, typename... Args> void dispatch(TargetT &t, uint8_t c, Args &&... args) {
#define Opt(x) case x: t.template dispatch<x>(std::forward<Args>(args)...); break
#define Opt4(x) Opt(x + 0x00); Opt(x + 0x01); Opt(x + 0x02); Opt(x + 0x03)
#define Opt16(x) Opt4(x + 0x00); Opt4(x + 0x04); Opt4(x + 0x08); Opt4(x + 0x0c)
#define Opt64(x) Opt16(x + 0x00); Opt16(x + 0x10); Opt16(x + 0x20); Opt16(x + 0x30)
#define Opt256(x) Opt64(x + 0x00); Opt64(x + 0x40); Opt64(x + 0x80); Opt64(x + 0xc0)
switch(c) {
Opt256(0);
}
#undef Opt256
#undef Opt64
#undef Opt16
#undef Opt4
#undef Opt
}
// Yes, macros, yuck. But I want an actual switch statement for the dispatch to start
// and to allow a simple [[fallthrough]] through all subsequent steps up until end.
// So I don't think I have much in the way of options here.
@ -30,6 +52,9 @@ namespace Reflection {
#define index1024(n) index512(n); index512(n+512);
#define index2048(n) index1024(n); index1024(n+1024);
#define switch_indices(x) switch(x) { default: assert(false); index2048(0); }
static constexpr int switch_max = 2048;
/// Provides glue for a run of calls like:
///
/// SequencerT.perform<0>(...)
@ -40,7 +65,7 @@ namespace Reflection {
/// Allowing the caller to execute any subrange of the calls.
template <typename SequencerT>
struct RangeDispatcher {
static_assert(SequencerT::max < 2048);
static_assert(SequencerT::max < switch_max);
/// Perform @c target.perform<n>() for the input range `begin <= n < end`.
template <typename... Args>
@ -69,23 +94,26 @@ struct RangeDispatcher {
} \
[[fallthrough]];
switch(begin) {
default: assert(false);
index2048(0);
}
switch_indices(begin);
#undef index
}
};
/// An optional target for a RangeDispatcher which uses a classifier to divide the input region into typed ranges, issuing calls to the target
/// only to begin and end each subrange, and for the number of cycles spent within.
/// Uses a classifier to divide a range into typed subranges and issues calls to a target of the form:
///
/// * begin<type>(location) upon entering a new region;
/// * end<type>(location) upon entering a region; and
/// * advance<type>(distance) in as many chunks as required to populate the inside of the region.
///
/// @c begin and @c end have iterator-style semantics: begin's location will be the first location in the relevant subrange and
/// end's will be the first location not in the relevant subrange.
template <typename ClassifierT, typename TargetT>
struct SubrangeDispatcher {
static_assert(ClassifierT::max < 2048);
static_assert(ClassifierT::max < switch_max);
template <typename... Args> static void dispatch(TargetT &target, int begin, int end, Args&&... args) {
static void dispatch(TargetT &target, int begin, int end) {
#define index(n) \
case n: \
if constexpr (n <= ClassifierT::max) { \
@ -108,10 +136,7 @@ struct SubrangeDispatcher {
} \
[[fallthrough]];
switch(begin) {
default: assert(false);
index2048(0);
}
switch_indices(begin);
#undef index
}
@ -130,6 +155,8 @@ struct SubrangeDispatcher {
}
};
#undef switch_indices
#undef index2
#undef index4
#undef index8

2
OSBindings/Mac/Clock SignalTests/6809OperationMapperTests.mm
View File

@ -9,7 +9,7 @@
#import <XCTest/XCTest.h>
#include "Dispatcher.hpp"
#include "RangeDispatcher.hpp"
#include "../../../InstructionSets/6809/OperationMapper.hpp"
using namespace InstructionSet::M6809;

19
Reflection/Dispatcher.hpp
View File

@ -13,26 +13,7 @@
namespace Reflection {
/*!
Calls @c t.dispatch<c>(args...) as efficiently as possible.
*/
template <typename TargetT, typename... Args> void dispatch(TargetT &t, uint8_t c, Args &&... args) {
#define Opt(x) case x: t.template dispatch<x>(std::forward<Args>(args)...); break
#define Opt4(x) Opt(x + 0x00); Opt(x + 0x01); Opt(x + 0x02); Opt(x + 0x03)
#define Opt16(x) Opt4(x + 0x00); Opt4(x + 0x04); Opt4(x + 0x08); Opt4(x + 0x0c)
#define Opt64(x) Opt16(x + 0x00); Opt16(x + 0x10); Opt16(x + 0x20); Opt16(x + 0x30)
#define Opt256(x) Opt64(x + 0x00); Opt64(x + 0x40); Opt64(x + 0x80); Opt64(x + 0xc0)
switch(c) {
Opt256(0);
}
#undef Opt256
#undef Opt64
#undef Opt16
#undef Opt4
#undef Opt
}
}