package era.mi.logic.wires;
+import static era.mi.logic.types.Bit.U;
+import static era.mi.logic.types.Bit.Z;
+
import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Iterator;
import java.util.List;
-import era.mi.logic.Bit;
import era.mi.logic.Simulation;
-import era.mi.logic.Util;
+import era.mi.logic.types.Bit;
+import era.mi.logic.types.BitVector;
+import era.mi.logic.types.BitVector.BitVectorMutator;
/**
* Represents an array of wires that can store n bits of information.
*/
public class Wire
{
- private Bit[] values;
+ private BitVector values;
public final int travelTime;
- private List<WireObserver> observers = new ArrayList<WireObserver>();
+ private List<ReadEnd> attached = new ArrayList<ReadEnd>();
public final int length;
- private List<WireEnd> inputs = new ArrayList<WireEnd>();
+ private List<ReadWriteEnd> inputs = new ArrayList<ReadWriteEnd>();
public Wire(int length, int travelTime)
{
private void initValues()
{
- values = Bit.U.makeArray(length);
+ values = U.toVector(length);
}
private void recalculateSingleInput()
{
- WireEnd input = inputs.get(0);
- if (!Arrays.equals(input.getInputValues(), values))
- {
- Bit[] oldValues = values.clone();
- System.arraycopy(input.getInputValues(), 0, values, 0, length);
- notifyObservers(oldValues);
- }
+ setNewValues(inputs.get(0).getInputValues());
}
private void recalculateMultipleInputs()
{
- Iterator<WireEnd> it = inputs.iterator();
- Bit[] newValues = it.next().inputValues.clone();
-
- while (it.hasNext())
- {
- WireEnd input = it.next();
- Bit[] bits = input.getInputValues();
- for (int i = 0; i < length; i++)
- {
- newValues[i] = newValues[i].combineWith(bits[i]);
- }
- }
+ BitVectorMutator mutator = BitVectorMutator.empty();
+ for (ReadWriteEnd wireArrayEnd : inputs)
+ mutator.join(wireArrayEnd.getInputValues());
+ setNewValues(mutator.get());
+ }
- if (!Arrays.equals(newValues, values))
- {
- Bit[] oldValues = values;
- values = newValues;
- notifyObservers(oldValues);
- }
+ private void setNewValues(BitVector newValues)
+ {
+ if (values.equals(newValues))
+ return;
+ BitVector oldValues = values;
+ values = newValues;
+ notifyObservers(oldValues);
}
private void recalculate()
{
long val = 0;
long mask = 1;
- for (int i = 0; i < length; i++)
+ for (Bit bit : values)
{
- switch (values[i])
+ switch (bit)
{
default:
case Z:
case X:
return 0; // TODO: Proper handling for getUnsignedValue(), if not all bits are 1 or 0;
- // Random number?
case ONE:
val |= mask;
break;
public Bit getValue(int index)
{
- return values[index];
+ return values.getBit(index);
}
- public Bit[] getValues(int start, int end)
+ public BitVector getValues(int start, int end)
{
- int length = end - start;
- Bit[] bits = new Bit[length];
- System.arraycopy(values, start, bits, 0, length);
- return bits;
+ return values.subVector(start, end);
}
- public Bit[] getValues()
+ public BitVector getValues()
{
- return values.clone();
+ return values;
}
/**
*
* @author Fabian Stemmler
*/
- public boolean addObserver(WireObserver ob)
+ private void attachEnd(ReadEnd end)
+ {
+ attached.add(end);
+ }
+
+ private void detachEnd(ReadEnd end)
{
- return observers.add(ob);
+ attached.remove(end);
}
- private void notifyObservers(Bit[] oldValues)
+ private void notifyObservers(BitVector oldValues)
{
- for (WireObserver o : observers)
- o.update(this, oldValues);
+ for (ReadEnd o : attached)
+ o.update(oldValues);
}
/**
- * Create and register a {@link WireEnd} object, which is tied to this {@link Wire}.
+ * Create and register a {@link ReadWriteEnd} object, which is tied to this {@link Wire}. This {@link ReadWriteEnd} can be written to.
*/
- public WireEnd createEnd()
+ public ReadWriteEnd createEnd()
{
- return new WireEnd();
+ return new ReadWriteEnd();
}
- private void registerInput(WireEnd toRegister)
+ /**
+ * Create a {@link ReadEnd} object, which is tied to this {@link Wire}. This {@link ReadEnd} cannot be written to.
+ */
+ public ReadEnd createReadOnlyEnd()
+ {
+ return new ReadEnd();
+ }
+
+ private void registerInput(ReadWriteEnd toRegister)
{
inputs.add(toRegister);
}
/**
- * A {@link WireEnd} feeds a constant signal into the {@link Wire} it is tied to. The combination of all inputs determines the
+ * A {@link ReadEnd} feeds a constant signal into the {@link Wire} it is tied to. The combination of all inputs determines the
* {@link Wire}s final value. X dominates all other inputs Z does not affect the final value, unless there are no other inputs than Z 0
* and 1 turn into X when they are mixed
*
* @author Fabian Stemmler
*/
- public class WireEnd
+ public class ReadEnd
{
- private boolean open;
- private Bit[] inputValues;
+ private List<WireObserver> observers = new ArrayList<WireObserver>();
- private WireEnd()
+ private ReadEnd()
{
super();
- open = true;
- initValues();
- registerInput(this);
+ Wire.this.attachEnd(this);
}
- private void initValues()
+ public void update(BitVector oldValues)
{
- inputValues = Bit.Z.makeArray(length);
- }
-
- /**
- * Sets the wires values. This takes up time, as specified by the {@link Wire}s travel time.
- *
- * @param newValues The new values the wires should take on.
- *
- * @author Fabian Stemmler
- */
- public void feedSignals(Bit... newValues)
- {
- if (newValues.length != length)
- throw new IllegalArgumentException(
- String.format("Attempted to input %d bits instead of %d bits.", newValues.length, length));
- feedSignals(0, newValues);
- }
-
- /**
- * Sets values of a subarray of wires. This takes up time, as specified by the {@link Wire}s travel time.
- *
- * @param newValues The new values the wires should take on.
- * @param startingBit The first index of the subarray of wires.
- *
- * @author Fabian Stemmler
- */
- public void feedSignals(int startingBit, Bit... newValues)
- {
- if (!open)
- throw new RuntimeException("Attempted to write to closed WireArrayEnd.");
- Simulation.TIMELINE.addEvent((e) -> setValues(startingBit, newValues), travelTime);
- }
-
- private void setValues(int startingBit, Bit... newValues)
- {
- int exclLastIndex = startingBit + newValues.length;
- if (length < exclLastIndex)
- throw new ArrayIndexOutOfBoundsException(
- String.format("Attempted to input bits from index %d to %d when there are only %d wires.", startingBit,
- exclLastIndex - 1, length));
- if (!Arrays.equals(inputValues, startingBit, exclLastIndex, newValues, 0, newValues.length))
- {
- System.arraycopy(newValues, 0, inputValues, startingBit, newValues.length);
- Wire.this.recalculate();
- }
- }
-
- /**
- * @return The value (of bit 0) the {@link WireEnd} is currently feeding into the associated {@link Wire}.
- */
- public Bit getInputValue()
- {
- return getInputValue(0);
- }
-
- /**
- * @return The value which the {@link WireEnd} is currently feeding into the associated {@link Wire} at the indexed {@link Bit}.
- */
- public Bit getInputValue(int index)
- {
- return inputValues[index];
- }
-
- /**
- * @return A copy (safe to modify) of the values the {@link WireEnd} is currently feeding into the associated {@link Wire}.
- */
- public Bit[] getInputValues()
- {
- return getInputValues(0, length);
- }
-
- public Bit[] getInputValues(int start, int end)
- {
- int length = end - start;
- Bit[] bits = new Bit[length];
- System.arraycopy(inputValues, start, bits, 0, length);
- return bits;
- }
-
- /**
- * {@link WireEnd} now feeds Z into the associated {@link Wire}.
- */
- public void clearSignals()
- {
- feedSignals(Bit.Z.makeArray(length));
- }
-
- public Bit[] wireValuesExcludingMe()
- {
- Bit[] bits = Bit.Z.makeArray(length);
- for (WireEnd wai : inputs)
- {
- if (wai == this)
- continue;
- Util.combineInto(bits, wai.getInputValues());
- }
- return bits;
+ for (WireObserver ob : observers)
+ ob.update(this, oldValues);
}
/**
*
* @author Fabian Stemmler
*/
- public Bit[] getValues()
+ public BitVector getValues()
{
return Wire.this.getValues();
}
*
* @author Fabian Stemmler
*/
- public Bit[] getValues(int start, int end)
+ public BitVector getValues(int start, int end)
{
return Wire.this.getValues(start, end);
}
@Override
public String toString()
{
- return Arrays.toString(values);
- // return String.format("%s \nFeeding: %s", WireArray.this.toString(), Arrays.toString(inputValues));
+ return Wire.this.toString();
}
- public void disconnect()
+ public void close()
{
inputs.remove(this);
- open = false;
+ detachEnd(this);
+ recalculate();
}
public int length()
public boolean addObserver(WireObserver ob)
{
- return Wire.this.addObserver(ob);
+ return observers.add(ob);
}
public Wire getWire()
}
}
+ public class ReadWriteEnd extends ReadEnd
+ {
+ private boolean open;
+ private BitVector inputValues;
+
+ private ReadWriteEnd()
+ {
+ super();
+ open = true;
+ initValues();
+ registerInput(this);
+ }
+
+ private void initValues()
+ {
+ inputValues = U.toVector(length);
+ }
+
+ /**
+ * Sets the wires values. This takes up time, as specified by the {@link Wire}s travel time.
+ *
+ * @param newValues The new values the wires should take on.
+ *
+ * @author Fabian Stemmler
+ */
+ public void feedSignals(Bit... newValues)
+ {
+ feedSignals(BitVector.of(newValues));
+ }
+
+ public void feedSignals(BitVector newValues)
+ {
+ if (newValues.length() != length)
+ throw new IllegalArgumentException(
+ String.format("Attempted to input %d bits instead of %d bits.", newValues.length(), length));
+ if (!open)
+ throw new RuntimeException("Attempted to write to closed WireArrayEnd.");
+ Simulation.TIMELINE.addEvent(e -> setValues(newValues), travelTime);
+ }
+
+ /**
+ * Sets values of a subarray of wires. This takes up time, as specified by the {@link Wire}s travel time.
+ *
+ * @param bitVector The new values the wires should take on.
+ * @param startingBit The first index of the subarray of wires.
+ *
+ * @author Fabian Stemmler
+ */
+ public void feedSignals(int startingBit, BitVector bitVector)
+ {
+ if (!open)
+ throw new RuntimeException("Attempted to write to closed WireArrayEnd.");
+ Simulation.TIMELINE.addEvent(e -> setValues(startingBit, bitVector), travelTime);
+ }
+
+ private void setValues(int startingBit, BitVector newValues)
+ {
+ // index check covered in equals
+ if (!inputValues.equalsWithOffset(newValues, startingBit))
+ {
+ Bit[] vals = inputValues.getBits();
+ System.arraycopy(newValues.getBits(), 0, vals, startingBit, newValues.length());
+ inputValues = BitVector.of(vals);
+ Wire.this.recalculate();
+ }
+ }
+
+ private void setValues(BitVector newValues)
+ {
+ if (inputValues.equals(newValues))
+ return;
+ inputValues = newValues;
+ Wire.this.recalculate();
+ }
+
+ /**
+ * @return The value (of bit 0) the {@link ReadEnd} is currently feeding into the associated {@link Wire}.
+ */
+ public Bit getInputValue()
+ {
+ return getInputValue(0);
+ }
+
+ /**
+ * @return The value which the {@link ReadEnd} is currently feeding into the associated {@link Wire} at the indexed {@link Bit}.
+ */
+ public Bit getInputValue(int index)
+ {
+ return inputValues.getBit(index);
+ }
+
+ /**
+ * @return A copy (safe to modify) of the values the {@link ReadEnd} is currently feeding into the associated {@link Wire}.
+ */
+ public BitVector getInputValues()
+ {
+ return getInputValues(0, length);
+ }
+
+ public BitVector getInputValues(int start, int end)
+ {
+ return inputValues.subVector(start, end);
+ }
+
+ /**
+ * {@link ReadEnd} now feeds Z into the associated {@link Wire}.
+ */
+ public void clearSignals()
+ {
+ feedSignals(Z.toVector(length));
+ }
+
+ public BitVector wireValuesExcludingMe()
+ {
+ BitVectorMutator mutator = BitVectorMutator.empty();
+ for (ReadWriteEnd wireEnd : inputs)
+ {
+ if (wireEnd == this)
+ continue;
+ mutator.join(wireEnd.inputValues);
+ }
+ return mutator.get();
+ }
+
+ @Override
+ public String toString()
+ {
+ return inputValues.toString();
+ }
+ }
+
@Override
public String toString()
{
- return String.format("wire 0x%08x value: %s inputs: %s", hashCode(), Arrays.toString(values), inputs);
+ return String.format("wire 0x%08x value: %s inputs: %s", hashCode(), values, inputs);
// Arrays.toString(values), inputs.stream().map(i -> Arrays.toString(i.inputValues)).reduce((s1, s2) -> s1 + s2)
}
- public static WireEnd[] extractEnds(Wire[] w)
+ public static ReadEnd[] extractEnds(Wire[] w)
{
- WireEnd[] inputs = new WireEnd[w.length];
+ ReadEnd[] inputs = new ReadEnd[w.length];
for (int i = 0; i < w.length; i++)
inputs[i] = w[i].createEnd();
return inputs;
projects / Mograsim.git / blobdiff