import era.mi.logic.Bit;
import era.mi.logic.Simulation;
+import era.mi.logic.Util;
/**
* Represents an array of wires that can store n bits of information.
* @author Fabian Stemmler
*
*/
-public class WireArray
-{
- private Bit[] values;
- public final int travelTime;
- private List<WireArrayObserver> observers = new ArrayList<WireArrayObserver>();
- public final int length;
- private List<WireArrayInput> inputs = new ArrayList<WireArrayInput>();
-
- public WireArray(int length, int travelTime)
- {
- if (length < 1)
- throw new IllegalArgumentException("Tried to create an array of wires with length " + length
- + ", but a length of less than 1 makes no sense.");
- this.length = length;
- this.travelTime = travelTime;
- initValues();
- }
-
- private void initValues()
- {
- values = new Bit[length];
- for (int i = 0; i < length; i++)
- values[i] = Bit.Z;
- }
-
- private void recalculateSingleInput()
- {
- WireArrayInput input = inputs.get(0);
- if (!Arrays.equals(input.getValues(), values))
- {
- System.arraycopy(input.getValues(), 0, values, 0, length);
- notifyObservers();
+public class WireArray {
+ private Bit[] values;
+ public final int travelTime;
+ private List<WireArrayObserver> observers = new ArrayList<WireArrayObserver>();
+ public final int length;
+ private List<WireArrayInput> inputs = new ArrayList<WireArrayInput>();
+
+ public WireArray(int length, int travelTime) {
+ if (length < 1)
+ throw new IllegalArgumentException(
+ String.format("Tried to create an array of wires with length %d, but a length of less than 1 makes no sense.", length));
+ this.length = length;
+ this.travelTime = travelTime;
+ initValues();
}
- }
-
- private void recalculateMultipleInputs()
- {
- Iterator<WireArrayInput> it = inputs.iterator();
- Bit[] newValues = it.next().values.clone();
-
- while (it.hasNext())
- {
- WireArrayInput input = it.next();
- Bit[] bits = input.getValues();
- for (int i = 0; i < length; i++)
- {
- if (Bit.Z.equals(bits[i]) || newValues[i].equals(bits[i]))
- continue;
- else if (Bit.Z.equals(newValues[i]))
- newValues[i] = bits[i];
- else
- newValues[i] = Bit.X;
- }
+
+ private void initValues() {
+ values = Bit.Z.makeArray(length);
}
- if (!Arrays.equals(newValues, values))
- {
- notifyObservers();
- values = newValues;
+ private void recalculateSingleInput() {
+ WireArrayInput input = inputs.get(0);
+ if (!Arrays.equals(input.getValues(), values)) {
+ Bit[] oldValues = values.clone();
+ System.arraycopy(input.getValues(), 0, values, 0, length);
+ notifyObservers(oldValues);
+ }
}
- }
-
- private void recalculate()
- {
- switch (inputs.size())
- {
- case 0:
- return;
- case 1:
- recalculateSingleInput();
- break;
- default:
- recalculateMultipleInputs();
+
+ private void recalculateMultipleInputs() {
+ Iterator<WireArrayInput> it = inputs.iterator();
+ Bit[] newValues = it.next().inputValues.clone();
+
+ while (it.hasNext()) {
+ WireArrayInput input = it.next();
+ Bit[] bits = input.getValues();
+ for (int i = 0; i < length; i++) {
+ if (Bit.Z.equals(bits[i]) || newValues[i].equals(bits[i]))
+ continue;
+ else if (Bit.Z.equals(newValues[i]))
+ newValues[i] = bits[i];
+ else
+ newValues[i] = Bit.X;
+ }
+ }
+
+ if (!Arrays.equals(newValues, values)) {
+ Bit[] oldValues = values;
+ values = newValues;
+ notifyObservers(oldValues);
+ }
}
- }
-
- /**
- * The WireArray is interpreted as an unsigned integer with n bits.
- *
- * @return <code>true</code> if all bits are either <code>Bit.ONE</code> or
- * <code>Bit.ZERO</code> (they do not all have to have the same value),
- * not <code>Bit.X</code> or <code>Bit.Z</code>. <code>false</code> is
- * returned otherwise.
- *
- * @author Fabian Stemmler
- */
- public boolean hasNumericValue()
- {
- for (Bit b : values)
- {
- if (b != Bit.ZERO && b != Bit.ONE)
- return false;
+
+ private void recalculate() {
+ switch (inputs.size()) {
+ case 0:
+ return;
+ case 1:
+ recalculateSingleInput();
+ break;
+ default:
+ recalculateMultipleInputs();
+ }
}
- return true;
- }
-
- /**
- * The WireArray is interpreted as an unsigned integer with n bits.
- *
- * @return The unsigned value of the {@link WireArray}'s bits, where value 0
- * corresponds with 2^0, value 1 is 2^1 and so on.
- *
- * @author Fabian Stemmler
- */
- public long getUnsignedValue()
- {
- long val = 0;
- long mask = 1;
- for (int i = 0; i < length; i++)
- {
- switch (values[i])
- {
- 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;
- case ZERO:
- }
- mask = mask << 1;
+
+ /**
+ * The WireArray is interpreted as an unsigned integer with n bits.
+ *
+ * @return <code>true</code> if all bits are either <code>Bit.ONE</code> or <code>Bit.ZERO</code> (they do not all have to have the same
+ * value), not <code>Bit.X</code> or <code>Bit.Z</code>. <code>false</code> is returned otherwise.
+ *
+ * @author Fabian Stemmler
+ */
+ public boolean hasNumericValue() {
+ for (Bit b : values) {
+ if (b != Bit.ZERO && b != Bit.ONE)
+ return false;
+ }
+ return true;
}
- return val;
- }
-
- /**
- * The WireArray is interpreted as a signed integer with n bits.
- *
- * @return The signed value of the {@link WireArray}'s bits, where value 0
- * corresponds with 2^0, value 1 is 2^1 and so on.
- *
- * @author Fabian Stemmler
- */
- public long getSignedValue()
- {
- long val = getUnsignedValue();
- long mask = 1 << (length - 1);
- if ((mask & val) != 0)
- {
- int shifts = 64 - length;
- return (val << shifts) >> shifts;
+
+ /**
+ * The WireArray is interpreted as an unsigned integer with n bits.
+ *
+ * @return The unsigned value of the {@link WireArray}'s bits, where value 0 corresponds with 2^0, value 1 is 2^1 and so on.
+ *
+ * @author Fabian Stemmler
+ */
+ public long getUnsignedValue() {
+ long val = 0;
+ long mask = 1;
+ for (int i = 0; i < length; i++) {
+ switch (values[i]) {
+ 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;
+ case ZERO:
+ }
+ mask = mask << 1;
+ }
+ return val;
}
- return val;
- }
-
- /**
- * Included for convenient use on {@link WireArray}s of length 1.
- *
- * @return The value of bit 0.
- *
- * @author Fabian Stemmler
- */
- public Bit getValue()
- {
- return getValue(0);
- }
-
- /**
- *
- * @param index Index of the requested bit.
- * @return The value of the indexed bit.
- *
- * @author Fabian Stemmler
- */
- public Bit getValue(int index)
- {
- return values[index];
- }
-
- public Bit[] getValues(int start, int end)
- {
- int length = end - start;
- Bit[] bits = new Bit[length];
- System.arraycopy(values, start, bits, 0, length);
- return bits;
- }
-
- /**
- * @return An array of length n containing the values of the n bits in the
- * {@link WireArray}. Can be safely modified.
- *
- * @author Fabian Stemmler
- */
- public Bit[] getValues()
- {
- return values.clone();
- }
-
- /**
- * Adds an {@link WireArrayObserver}, who will be notified when the value of the
- * {@link WireArray} is updated.
- *
- * @param ob The {@link WireArrayObserver} to be notified of changes.
- * @return true if the given {@link WireArrayObserver} was not already
- * registered, false otherwise
- *
- * @author Fabian Stemmler
- */
- public boolean addObserver(WireArrayObserver ob)
- {
- return observers.add(ob);
- }
-
- private void notifyObservers()
- {
- for (WireArrayObserver o : observers)
- o.update(this);
- }
-
- /**
- * Create and register a {@link WireArrayInput} object, which is tied to this
- * {@link WireArray}.
- */
- public WireArrayInput createInput()
- {
- return new WireArrayInput(this);
- }
-
- private void registerInput(WireArrayInput toRegister)
- {
- inputs.add(toRegister);
- }
-
- /**
- * A {@link WireArrayInput} feeds a constant signal into the {@link WireArray}
- * it is tied to. The combination of all inputs determines the
- * {@link WireArray}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 WireArrayInput
- {
- public final WireArray owner;
- private Bit[] values;
- private WireArrayInput(WireArray owner)
- {
- super();
- this.owner = owner;
- initValues();
- owner.registerInput(this);
+ /**
+ * The WireArray is interpreted as a signed integer with n bits.
+ *
+ * @return The signed value of the {@link WireArray}'s bits, where value 0 corresponds with 2^0, value 1 is 2^1 and so on.
+ *
+ * @author Fabian Stemmler
+ */
+ public long getSignedValue() {
+ long val = getUnsignedValue();
+ long mask = 1 << (length - 1);
+ if ((mask & val) != 0) {
+ int shifts = 64 - length;
+ return (val << shifts) >> shifts;
+ }
+ return val;
}
- private void initValues()
- {
- values = new Bit[length];
- for (int i = 0; i < length; i++)
- values[i] = Bit.Z;
+ /**
+ * Included for convenient use on {@link WireArray}s of length 1.
+ *
+ * @return The value of bit 0.
+ *
+ * @author Fabian Stemmler
+ */
+ public Bit getValue() {
+ return getValue(0);
}
/**
- * Sets the wires values. This takes up time, as specified by the
- * {@link WireArray}s travel time.
*
- * @param newValues The new values the wires should take on.
+ * @param index Index of the requested bit.
+ * @return The value of the indexed bit.
+ *
+ * @author Fabian Stemmler
+ */
+ public Bit getValue(int index) {
+ return values[index];
+ }
+
+ public Bit[] getValues(int start, int end) {
+ int length = end - start;
+ Bit[] bits = new Bit[length];
+ System.arraycopy(values, start, bits, 0, length);
+ return bits;
+ }
+
+ /**
+ * @return An array of length n containing the values of the n bits in the {@link WireArray}. Can be safely modified.
*
* @author Fabian Stemmler
*/
- public void feedSignals(Bit... newValues)
- {
- if (newValues.length == length)
- {
- feedSignals(0, newValues);
- } else
- throw new IllegalArgumentException(
- "Attempted to input " + newValues.length + " bits instead of " + length + " bits.");
+ public Bit[] getValues() {
+ return values.clone();
}
/**
- * Sets values of a subarray of wires. This takes up time, as specified by the
- * {@link WireArray}s travel time.
+ * Adds an {@link WireArrayObserver}, who will be notified when the value of the {@link WireArray} is updated.
*
- * @param newValues The new values the wires should take on.
- * @param startingBit The first index of the subarray of wires.
+ * @param ob The {@link WireArrayObserver} to be notified of changes.
+ * @return true if the given {@link WireArrayObserver} was not already registered, false otherwise
*
* @author Fabian Stemmler
*/
- public void feedSignals(int startingBit, Bit... newValues)
- {
- Simulation.TIMELINE.addEvent((e) -> setValues(startingBit, newValues), travelTime);
+ public boolean addObserver(WireArrayObserver ob) {
+ return observers.add(ob);
}
- private void setValues(int startingBit, Bit... newValues)
- {
- int exclLastIndex = startingBit + newValues.length;
- if (length < exclLastIndex)
- throw new ArrayIndexOutOfBoundsException("Attempted to input bits from index " + startingBit + " to "
- + exclLastIndex + " when there are only " + length + "wires.");
- if (!Arrays.equals(values, startingBit, exclLastIndex, newValues, 0, newValues.length))
- {
- System.arraycopy(newValues, 0, values, startingBit, newValues.length);
- owner.recalculate();
- }
+ private void notifyObservers(Bit[] oldValues) {
+ for (WireArrayObserver o : observers)
+ o.update(this, oldValues);
}
- public Bit[] getValues()
- {
- return values.clone();
+ /**
+ * Create and register a {@link WireArrayInput} object, which is tied to this {@link WireArray}.
+ */
+ public WireArrayInput createInput() {
+ return new WireArrayInput(this);
}
- public void clearSignals()
- {
- Bit[] bits = new Bit[length];
- for (int i = 0; i < length; i++)
- bits[i] = Bit.Z;
- feedSignals(bits);
+ private void registerInput(WireArrayInput toRegister) {
+ inputs.add(toRegister);
+ }
+
+ /**
+ * A {@link WireArrayInput} feeds a constant signal into the {@link WireArray} it is tied to. The combination of all inputs determines
+ * the {@link WireArray}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 WireArrayInput {
+ public final WireArray owner;
+ private Bit[] inputValues;
+
+ private WireArrayInput(WireArray owner) {
+ super();
+ this.owner = owner;
+ initValues();
+ owner.registerInput(this);
+ }
+
+ private void initValues() {
+ inputValues = Bit.Z.makeArray(length);
+ }
+
+ /**
+ * Sets the wires values. This takes up time, as specified by the {@link WireArray}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) {
+ feedSignals(0, newValues);
+ } else
+ throw new IllegalArgumentException(
+ String.format("Attempted to input %o bits instead of %o bits.", newValues.length, length));
+ }
+
+ /**
+ * Sets values of a subarray of wires. This takes up time, as specified by the {@link WireArray}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) {
+ 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 %o to %o when there are only %o wires.", startingBit,
+ exclLastIndex - 1, length));
+ if (!Arrays.equals(inputValues, startingBit, exclLastIndex, newValues, 0, newValues.length)) {
+ System.arraycopy(newValues, 0, inputValues, startingBit, newValues.length);
+ owner.recalculate();
+ }
+ }
+
+ /**
+ * Returns a copy (safe to modify) of the values the {@link WireArrayInput} is currently feeding into the associated
+ * {@link WireArray}.
+ */
+ public Bit[] getValues() {
+ return inputValues.clone();
+ }
+
+ /**
+ * {@link WireArrayInput} now feeds Z into the associated {@link WireArray}.
+ */
+ public void clearSignals() {
+ feedSignals(Bit.Z.makeArray(length));
+ }
+
+ public Bit[] wireValuesExcludingMe() {
+ Bit[] bits = Bit.Z.makeArray(length);
+ for (WireArrayInput wai : inputs) {
+ if (wai == this)
+ continue;
+ Util.combineInto(bits, wai.getValues());
+ }
+ return bits;
+ }
+
+ @Override
+ public String toString() {
+ return Arrays.toString(inputValues);
+ }
}
@Override
- public String toString()
- {
- return Arrays.toString(values);
+ public String toString() {
+ return String.format("wire 0x%08x value: %s inputs: %s", hashCode(), Arrays.toString(values), inputs);
+ }
+
+ public static WireArrayInput[] extractInputs(WireArray[] w) {
+ WireArrayInput[] inputs = new WireArrayInput[w.length];
+ for (int i = 0; i < w.length; i++)
+ inputs[i] = w[i].createInput();
+ return inputs;
}
- }
-
- @Override
- public String toString()
- {
- return String.format("wire 0x%08x value: %s inputs: %s", hashCode(), Arrays.toString(values), inputs);
- }
-
- public static WireArrayInput[] extractInputs(WireArray[] w)
- {
- WireArrayInput[] inputs = new WireArrayInput[w.length];
- for(int i = 0; i < w.length; i++)
- inputs[i] = w[i].createInput();
- return inputs;
- }
}
\ No newline at end of file
projects / Mograsim.git / blobdiff