+++ /dev/null
-package era.mi.logic.wires;
-
-import java.io.Closeable;
-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;
-
-/**
- * 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;
- List<WireArrayEnd> inputs = new ArrayList<WireArrayEnd>();
-
- 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 initValues()
- {
- values = Bit.U.makeArray(length);
- }
-
- private void recalculateSingleInput()
- {
- WireArrayEnd 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 recalculateMultipleInputs()
- {
- Iterator<WireArrayEnd> it = inputs.iterator();
- Bit[] newValues = it.next().inputValues.clone();
-
- while (it.hasNext())
- {
- WireArrayEnd input = it.next();
- Bit[] bits = input.getValues();
- for (int i = 0; i < length; i++)
- {
- newValues[i] = newValues[i].combineWith(bits[i]);
- }
- }
-
- if (!Arrays.equals(newValues, values))
- {
- Bit[] oldValues = values;
- values = newValues;
- notifyObservers(oldValues);
- }
- }
-
- void recalculate()
- {
- switch (inputs.size())
- {
- case 0:
- return;
- case 1:
- recalculateSingleInput();
- break;
- default:
- recalculateMultipleInputs();
- }
- }
-
- /**
- * 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;
- }
-
- /**
- * 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;
- }
-
- /**
- * 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;
- }
-
- /**
- * 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(Bit[] oldValues)
- {
- for (WireArrayObserver o : observers)
- o.update(this, oldValues);
- }
-
- /**
- * Create and register a {@link WireArrayEnd} object, which is tied to this {@link WireArray}.
- */
- public WireArrayEnd createInput()
- {
- return new WireArrayEnd(this);
- }
-
- void registerInput(WireArrayEnd toRegister)
- {
- inputs.add(toRegister);
- }
-
- /**
- * A {@link WireArrayEnd} 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 WireArrayEnd implements Closeable
- {
- public final WireArray owner;
- private boolean open;
- Bit[] inputValues;
-
- WireArrayEnd(WireArray owner)
- {
- super();
- this.owner = owner;
- open = true;
- initValues();
- owner.registerInput(this);
- }
-
- private void initValues()
- {
- inputValues = Bit.U.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)
- 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 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)
- {
- 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);
- owner.recalculate();
- }
- }
-
- /**
- * Returns a copy (safe to modify) of the values the {@link WireArrayEnd} is currently feeding into the associated
- * {@link WireArray}.
- */
- public Bit[] getValues()
- {
- return inputValues.clone();
- }
-
- /**
- * {@link WireArrayEnd} 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 (WireArrayEnd wai : inputs)
- {
- if (wai == this)
- continue;
- Util.combineInto(bits, wai.getValues());
- }
- return bits;
- }
-
- public Bit getWireValue()
- {
- return owner.getValue();
- }
-
- public Bit[] getWireValues()
- {
- return owner.getValues();
- }
-
- @Override
- public String toString()
- {
- return Arrays.toString(inputValues);
- }
-
- @Override
- public void close()
- {
- inputs.remove(this);
- open = false;
- }
- }
-
- @Override
- public String toString()
- {
- return String.format("wire 0x%08x value: %s inputs: %s", hashCode(), Arrays.toString(values), inputs);
- }
-
- public static WireArrayEnd[] extractInputs(WireArray[] w)
- {
- WireArrayEnd[] inputs = new WireArrayEnd[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