X-Git-Url: https://mograsim.net/gitweb/?a=blobdiff_plain;f=net.mograsim.logic.core%2Fsrc%2Fnet%2Fmograsim%2Flogic%2Fcore%2Ftypes%2FBitVector.java;h=aed0288d93b8efd0a660e3b9dc6b49248036ad1a;hb=153f81323a215691a0477af3fd1dd4a9d5b02958;hp=74375210549cc280f52ec497ece927a76835df90;hpb=4afd7c9afe4333815a488f90bdc3c3b9991028f4;p=Mograsim.git

diff --git a/net.mograsim.logic.core/src/net/mograsim/logic/core/types/BitVector.java b/net.mograsim.logic.core/src/net/mograsim/logic/core/types/BitVector.java
index 74375210..aed0288d 100644
--- a/net.mograsim.logic.core/src/net/mograsim/logic/core/types/BitVector.java
+++ b/net.mograsim.logic.core/src/net/mograsim/logic/core/types/BitVector.java
@@ -2,6 +2,7 @@ package net.mograsim.logic.core.types;
 
 import static java.lang.String.format;
 
+import java.math.BigInteger;
 import java.util.Arrays;
 import java.util.Iterator;
 import java.util.NoSuchElementException;
@@ -49,11 +50,26 @@ public final class BitVector implements StrictLogicType<BitVector>, Iterable<Bit
 		return new BitVector(bits.clone());
 	}
 
-	public static BitVector of(Bit bit, int length)
+	public static BitVector of(Bit bit, int width)
 	{
-		if (length == 1)
+		if (width == 1)
 			return SINGLE_BIT_MAPPING[bit.ordinal()];
-		return new BitVector(bit.makeArray(length));
+		return new BitVector(bit.makeArray(width));
+	}
+
+	public static BitVector from(long value, int bits)
+	{
+		return from(BigInteger.valueOf(value), bits);
+	}
+
+	public static BitVector from(BigInteger value, int bits)
+	{
+		Bit[] values = new Bit[bits];
+		for (int i = 0; i < bits; i++)
+		{
+			values[bits - i - 1] = Bit.of(value.testBit(i));
+		}
+		return new BitVector(values);
 	}
 
 	public BitVectorMutator mutator()
@@ -82,6 +98,21 @@ public final class BitVector implements StrictLogicType<BitVector>, Iterable<Bit
 		return bits.clone();
 	}
 
+	/**
+	 * Checks if all bits are {@link Bit#isBinary() binary}.
+	 * 
+	 * @see Bit#isBinary()
+	 */
+	public boolean isBinary()
+	{
+		for (int i = 0; i < bits.length; i++)
+		{
+			if (!bits[i].isBinary())
+				return false;
+		}
+		return true;
+	}
+
 	@Override
 	public BitVector join(BitVector t)
 	{
@@ -126,21 +157,21 @@ public final class BitVector implements StrictLogicType<BitVector>, Iterable<Bit
 		return new BitVector(unOp(bits.clone(), Bit::not));
 	}
 
-	public int length()
+	public int width()
 	{
 		return bits.length;
 	}
 
 	public BitVector concat(BitVector other)
 	{
-		Bit[] newBits = Arrays.copyOf(bits, length() + other.length());
-		System.arraycopy(other.bits, 0, newBits, length(), other.length());
+		Bit[] newBits = Arrays.copyOf(bits, width() + other.width());
+		System.arraycopy(other.bits, 0, newBits, width(), other.width());
 		return new BitVector(newBits);
 	}
 
 	public BitVector subVector(int start)
 	{
-		return new BitVector(Arrays.copyOfRange(bits, start, length()));
+		return new BitVector(Arrays.copyOfRange(bits, start, width()));
 	}
 
 	public BitVector subVector(int start, int end)
@@ -150,8 +181,8 @@ public final class BitVector implements StrictLogicType<BitVector>, Iterable<Bit
 
 	private void checkCompatibility(BitVector bv)
 	{
-		if (length() != bv.length())
-			throw new IllegalArgumentException(format("BitVector length does not match: %d and %d", length(), bv.length()));
+		if (width() != bv.width())
+			throw new IllegalArgumentException(format("BitVector width does not match: %d and %d", width(), bv.width()));
 	}
 
 	static Bit[] binOp(Bit[] dest, Bit[] second, BinaryOperator<Bit> op)
@@ -196,21 +227,32 @@ public final class BitVector implements StrictLogicType<BitVector>, Iterable<Bit
 		}
 
 		/**
-		 * Returns a new mutator of the specified length, <b>with all bits set to <code>null</code></b>. Use with care!
+		 * Returns a new mutator of the specified width, <b>with all bits set to <code>null</code></b>. Use with care!
 		 */
-		public static BitVectorMutator ofLength(int length)
+		public static BitVectorMutator ofWidth(int width)
 		{
-			return new BitVectorMutator(new Bit[length]);
+			return new BitVectorMutator(new Bit[width]);
 		}
 
 		/**
 		 * Returns an empty mutator which has no bits set and will simply copy the values from the first binary operation performed.
+		 * <p>
+		 * An empty BitVectorMutator <b>must not</b> be converted to BitVector or used to manipulate single bits until at least one two
+		 * operand logic operation is performed.
 		 */
 		public static BitVectorMutator empty()
 		{
 			return new BitVectorMutator(null);
 		}
 
+		/**
+		 * @see #empty()
+		 */
+		public boolean isEmpty()
+		{
+			return bits == null;
+		}
+
 		/**
 		 * Produces the resulting, immutable {@link BitVector}<br>
 		 * 
@@ -267,6 +309,8 @@ public final class BitVector implements StrictLogicType<BitVector>, Iterable<Bit
 		 */
 		public void setMSBit(int bitIndex, Bit bit)
 		{
+			if (bits == null)
+				throw new IllegalStateException("cannot set a bit of an empty mutator");
 			bits[bitIndex] = bit;
 		}
 
@@ -275,6 +319,8 @@ public final class BitVector implements StrictLogicType<BitVector>, Iterable<Bit
 		 */
 		public void setLSBit(int bitIndex, Bit bit)
 		{
+			if (bits == null)
+				throw new IllegalStateException("cannot set a bit of an empty mutator");
 			bits[bits.length - bitIndex - 1] = bit;
 		}
 
@@ -283,6 +329,8 @@ public final class BitVector implements StrictLogicType<BitVector>, Iterable<Bit
 		 */
 		public Bit getMSBit(int bitIndex)
 		{
+			if (bits == null)
+				throw new IllegalStateException("cannot get a bit of an empty mutator");
 			return bits[bitIndex];
 		}
 
@@ -291,18 +339,22 @@ public final class BitVector implements StrictLogicType<BitVector>, Iterable<Bit
 		 */
 		public Bit getLSBit(int bitIndex)
 		{
+			if (bits == null)
+				throw new IllegalStateException("cannot get a bit of an empty mutator");
 			return bits[bits.length - bitIndex - 1];
 		}
 
-		public int length()
+		public int width()
 		{
+			if (bits == null)
+				throw new IllegalStateException("cannot obtain a width of an empty mutator");
 			return bits.length;
 		}
 
 		private void checkCompatibility(BitVector bv)
 		{
-			if (bits != null && bits.length != bv.length())
-				throw new IllegalArgumentException(format("BitVector length does not match: %d and %d", bits.length, bv.length()));
+			if (bits != null && bits.length != bv.width())
+				throw new IllegalArgumentException(format("BitVector width does not match: %d and %d", bits.length, bv.width()));
 		}
 	}
 
@@ -333,9 +385,9 @@ public final class BitVector implements StrictLogicType<BitVector>, Iterable<Bit
 
 	/**
 	 * Does test for equality of values/content, shifting the other BitVector by <code>offset</code> to the right.<br>
-	 * Therefore <code>offset + other.length() <= this.length()</code> needs to be true.
+	 * Therefore <code>offset + other.width() <= this.wdith()</code> needs to be true.
 	 * 
-	 * @throws ArrayIndexOutOfBoundsException if <code>offset + other.length() > this.length()</code>
+	 * @throws ArrayIndexOutOfBoundsException if <code>offset + other.width() > this.width()</code>
 	 * 
 	 * @see Object#equals(Object)
 	 */
@@ -343,7 +395,7 @@ public final class BitVector implements StrictLogicType<BitVector>, Iterable<Bit
 	{
 		if (other == null)
 			return false;
-		return Arrays.equals(bits, offset, offset + other.length(), other.bits, 0, other.length());
+		return Arrays.equals(bits, offset, offset + other.width(), other.bits, 0, other.width());
 	}
 
 	/**
@@ -360,6 +412,26 @@ public final class BitVector implements StrictLogicType<BitVector>, Iterable<Bit
 		return sb.toString();
 	}
 
+	/**
+	 * Returns the value of the BitVector as BigInteger.
+	 * 
+	 * @throws NumberFormatException if the BitVector is not {@link #isBinary() binary}.
+	 */
+	public BigInteger getUnsignedValue()
+	{
+		if (!isBinary())
+			throw new NumberFormatException(this + " is not binary");
+		byte[] bytes = new byte[(bits.length / 8) + 1];
+		for (int i = 0; i < bits.length; i++)
+		{
+			if (Bit.ONE == bits[i])
+			{
+				bytes[i / 8] |= 1 << (i % 8);
+			}
+		}
+		return new BigInteger(bytes);
+	}
+
 	/**
 	 * Parses a String containing solely {@link Bit} symbols (MSB first)
 	 * 
@@ -396,7 +468,7 @@ public final class BitVector implements StrictLogicType<BitVector>, Iterable<Bit
 			@Override
 			public boolean hasNext()
 			{
-				return pos != length();
+				return pos != width();
 			}
 		};
 	}