v6502cpp/StateCalculator.cpp

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/*
* File: StateCalculator.cpp
* Author: Christopher
*
* Created on December 12, 2013, 8:29 PM
*/
#include "StateCalculator.h"
#include "Circuit.h"
#include "trans.h"
/*
* Recalculate segment states (on/off), based on the fact that the segments
* in segs have just changed state. Keep track of which other segments are
* affected, and repeat the process on those segments. Repeat until no more
* segments change state.
*/
#define SANE (100)
void StateCalculator::recalc(const SegmentSet& segs) {
int sanity(0);
SegmentSet changed(segs);
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while (!changed.empty()) {
if (++sanity >= SANE) {
throw "ERROR: reached maximum iteration limit while recalculating CPU state";
}
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StateCalculator c;
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for (auto s : changed) {
c.recalcNode(s);
}
changed = c.segs;
}
}
/*
* Gets group of segments currently electrically connected to seg,
* gets what their group value is (or should be), goes through all
* those segments and sets their "on" value. For all connected gates,
* turn on/off, and indicate that the segments connected to those
* transistors' source and drain legs have changed, by adding them
* to this->segs.
*/
void StateCalculator::recalcNode(Segment* seg) {
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if (!(seg->vss || seg->vcc)) {
Circuit c(seg);
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for (auto s : c) {
setSeg(s, c.getValue());
}
}
}
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void StateCalculator::setSeg(Segment* s, const bool on) {
if (s->on != on) {
s->on = on;
for (auto t : s->gates) {
setTrans(t, on);
}
}
}
void StateCalculator::setTrans(Trans* t, const bool on) {
if (t->on != on) {
t->on = on;
this->segs.insert(t->c1);
this->segs.insert(t->c2);
}
}