+package net.mograsim.logic.core.components.gates;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+
+import net.mograsim.logic.core.components.BasicComponent;
+import net.mograsim.logic.core.timeline.Timeline;
+import net.mograsim.logic.core.types.Bit;
+import net.mograsim.logic.core.types.BitVector;
+import net.mograsim.logic.core.wires.Wire.ReadEnd;
+import net.mograsim.logic.core.wires.Wire.ReadWriteEnd;
+
+public class WordAddressableMemoryComponent extends BasicComponent
+{
+ private final WordAddressableMemory memory;
+ private final static Bit read = Bit.ONE;
+
+ private ReadWriteEnd data;
+ private ReadEnd rWBit, address;
+
+ /**
+ *
+ * @param timeline
+ * @param processTime
+ * @param minimalAddress
+ * @param maximalAddress
+ * @param data
+ * @param rWBit 0: Write 1: Read
+ * @param address
+ */
+ public WordAddressableMemoryComponent(Timeline timeline, int processTime, long minimalAddress, long maximalAddress, ReadWriteEnd data,
+ ReadEnd rWBit, ReadEnd address)
+ {
+ super(timeline, processTime);
+ this.data = data;
+ this.rWBit = rWBit;
+ this.address = address;
+ data.registerObserver(this);
+ rWBit.registerObserver(this);
+ address.registerObserver(this);
+
+ memory = new WordAddressableMemory(data.length(), minimalAddress, maximalAddress);
+ }
+
+ @Override
+ protected void compute()
+ {
+ if (!address.hasNumericValue())
+ {
+ if (read.equals(rWBit.getValue()))
+ data.feedSignals(BitVector.of(Bit.U, data.length()));
+ else
+ data.clearSignals();
+ return;
+ }
+ long addressed = address.getUnsignedValue();
+ if (read.equals(rWBit.getValue()))
+ data.feedSignals(memory.getCell(addressed));
+ else
+ {
+ data.clearSignals();
+ System.out.println(memory);
+ memory.setCell(addressed, data.getValues());
+ }
+ }
+
+ @Override
+ public List<ReadEnd> getAllInputs()
+ {
+ return List.of(data, rWBit, address);
+ }
+
+ @Override
+ public List<ReadWriteEnd> getAllOutputs()
+ {
+ return List.of(data);
+ }
+
+ private class WordAddressableMemory
+ {
+ private final int cellWidth;
+ private final long minimalAddress, maximalAddress;
+ private final int pageSize;
+
+ private HashMap<Long, Page> pages;
+
+ public WordAddressableMemory(int cellWidth, long minimalAddress, long maximalAddress)
+ {
+ super();
+ this.cellWidth = cellWidth;
+ this.minimalAddress = minimalAddress;
+ this.maximalAddress = maximalAddress;
+ this.pages = new HashMap<>();
+ this.pageSize = 64;
+ }
+
+ public void setCell(long address, BitVector b)
+ {
+ if (address < minimalAddress || address > maximalAddress)
+ throw new IndexOutOfBoundsException(String.format("Memory address out of bounds! Minimum: %d Maimum: %d Actual: %d",
+ minimalAddress, maximalAddress, address));
+ long page = address / pageSize;
+ int offset = (int) (address % pageSize);
+ Page p = pages.get(Long.valueOf(page));
+ if (p == null)
+ pages.put(page, p = new Page());
+ p.setCell(offset, b);
+ }
+
+ public BitVector getCell(long address)
+ {
+ long page = address / pageSize;
+ int offset = (int) (address % pageSize);
+ Page p = pages.get(Long.valueOf(page));
+ if (p == null)
+ return BitVector.of(Bit.U, cellWidth);
+ return p.getCell(offset);
+ }
+
+ private class Page
+ {
+ private BitVector[] memory;
+
+ public Page()
+ {
+ memory = new BitVector[pageSize];
+ }
+
+ public BitVector getCell(int index)
+ {
+ BitVector b = memory[index];
+ if (b == null)
+ return BitVector.of(Bit.U, cellWidth);
+ return memory[index];
+ }
+
+ public void setCell(int index, BitVector bits)
+ {
+ if (bits.length() != cellWidth)
+ throw new IllegalArgumentException(
+ String.format("BitVector to be saved in memory cell has unexpected length. Expected: %d Actual: %d", cellWidth,
+ bits.length()));
+ memory[index] = bits;
+ }
+
+ @Override
+ public String toString()
+ {
+ return Arrays.deepToString(memory);
+ }
+ }
+ }
+}
+//import java.math.BigInteger;
+//
+//import net.mograsim.logic.core.types.Bit;
+//import net.mograsim.logic.core.types.BitVector;
+//
+//private byte[] encode(BitVector v)
+//{
+// BigInteger d = BigInteger.ZERO;
+// Bit[] bits = v.getBits();
+// for (int i = v.length() - 1; i >= 0; i--)
+// {
+// d = d.add(BigInteger.valueOf(bits[i].ordinal()));
+// d = d.multiply(BigInteger.valueOf(Bit.values().length));
+// }
+// return d.toByteArray();
+//}
+//
+///**
+// *
+// * @param bytes
+// * @param numBits length of the resulting BitVector
+// * @return
+// */
+//private BitVector decode(byte[] bytes, int numBits)
+//{
+// BigInteger d = new BigInteger(bytes);
+// Bit[] bits = new Bit[numBits];
+// return BitVector.of(bits);
+//}
+//
+//private static class CellArray
+//{
+// private byte[] bytes;
+// private final static byte mask = -1;
+// public CellArray(int numCells, int cellSize)
+// {
+// bytes = new byte[numCells * cellSize / 8];
+// }
+//
+// public byte[] getCell(int i)
+// {
+//
+// }
+//}