Edits and improvements for memory sizing

convex-core/src/main/java/convex/core/data/AArrayBlob.java

@@ -156,6 +156,13 @@ public boolean isChunkPacked() {
 	public boolean isFullyPacked() {
 		return (count==Blob.CHUNK_LENGTH);
 	}
+
+	@Override
+	protected long calcMemorySize() {	
+		// fast path for small Blobs, never have child cells
+		if (isEmbedded()) return 0;
+		return super.calcMemorySize();
+	}
 
 	@Override
 	public final byte byteAt(long i) {

convex-core/src/main/java/convex/core/data/ACell.java

@@ -227,7 +227,8 @@ public String toString() {
 	/**
 	 * Returns the CVM String representation of this Cell. Normally, this is as printed, but may be different for some types.
 	 * 
-	 * MUST return null in O(1) time if the length of the CVM String would exceed limit.
+	 * SHOULD return null in O(1) time if the length of the CVM String can be proved to exceed the limit.
+	 * MUST complete in O(limit) time and space otherwise
 	 * 
 	 * The String representation is intended to be a easy-to-read textual representation of the Cell's data content.
 	 * @param limit Limit of CVM String length in UTF-8 bytes
@@ -243,7 +244,7 @@ public AString toCVMString(long limit) {
 	/**
 	 * Gets the cached blob representing this Cell's Encoding in binary format, if it exists.
 	 * 
-	 * @return The cached blob for this cell, or null if not available. 
+	 * @return The cached blob for this cell, or null if not yet available. 
 	 */
 	public Blob cachedEncoding() {
 		return encoding;
@@ -290,7 +291,7 @@ public int getEncodingLength() {
 	 * Gets the Memory Size of this Cell, computing it if required.
 	 * 
 	 * The memory size is the total storage requirement for this cell. Embedded cells do not require storage for
-	 * their own encoding, but may require storage for nested non-embedded Refs.
+	 * their own encoding, but may require storage for nested branches.
 	 * 
 	 * @return Memory Size of this Cell
 	 */
@@ -306,7 +307,7 @@ public final long getMemorySize() {
 	 * Gets the Memory Size of a Cell, computing it if required.
 	 * 
 	 * The memory size is the total storage requirement for this cell. Embedded cells do not require storage for
-	 * their own encoding, but may require storage for nested non-embedded Refs.
+	 * their own encoding, but may require storage for nested branches.
 	 * 
 	 * @return Memory Size of this Cell
 	 */

convex-core/src/main/java/convex/core/data/ALongBlob.java

@@ -93,12 +93,6 @@ public final ByteBuffer getByteBuffer() {
 		return toFlatBlob().getByteBuffer();
 	}
 
-	@Override
-	protected final long calcMemorySize() {	
-		// always embedded and no child Refs, so memory size == 0
-		return 0;
-	}
-
 	@Override
 	public long hexMatch(ABlobLike<?> b, long start, long length) {
 		for (int i=0; i<length; i++) {
@@ -157,6 +151,12 @@ public final boolean isEmbedded() {
 		// Always embedded
 		return true;
 	}
+
+	@Override
+	protected final long calcMemorySize() {	
+		// always embedded and no child Refs, so memory size == 0
+		return 0;
+	}
 
 	@Override
 	public boolean isChunkPacked() {

convex-core/src/main/java/convex/core/data/Address.java

@@ -327,6 +327,12 @@ public CVMLong get(long i) {
 	public boolean isCanonical() {
 		return true;
 	}
+
+	@Override
+	protected long calcMemorySize() {	
+		// always embedded and no child Refs, so memory size == 0
+		return 0;
+	}
 
 	@Override
 	public boolean isCVMValue() {

convex-core/src/main/java/convex/core/data/Cells.java

@@ -174,7 +174,9 @@ public static ABlobLike<CVMLong> getEncoding(ACell a) {
 	public static long storageSize(ACell a) {
 		if (a==null) return 1;
 		long memSize=a.getMemorySize();
-		if (a.isEmbedded()) memSize+=a.getEncodingLength();
+		if (a.isEmbedded()) {
+			memSize+=a.getEncodingLength();
+		} 
 		return memSize;
 	}
 

convex-core/src/main/java/convex/core/data/Hash.java

@@ -179,8 +179,8 @@ public Blob toCanonical() {
 
 	@Override
 	public int estimatedEncodingSize() {
-		// tag plus raw data
-		return 1 + LENGTH;
+		// tag plus length plis raw data
+		return 2 + LENGTH;
 	}
 
 	@Override

convex-core/src/main/java/convex/core/lang/impl/CoreFn.java

@@ -132,10 +132,16 @@ public void validateCell() throws InvalidDataException {
 
 	@Override
 	public boolean isEmbedded() {
-		// embed core functions, since they are the same size as small symbols
+		// core functions are always small embedded values
 		return true;
 	}
 
+	@Override
+	protected final long calcMemorySize() {	
+		// always embedded and no child Refs, so memory size == 0
+		return 0;
+	}
+
 	@Override 
 	public boolean equals(ACell o) {
 		// This is OK since these are guaranteed to be singleton instances!