GP-958 corrected various issues related to use of enum bitfields and

flex-array with DynamicDataType

Ghidra/Features/Base/src/main/java/ghidra/app/util/viewer/field/PreCommentFieldFactory.java

@@ -274,7 +274,7 @@ public class PreCommentFieldFactory extends FieldFactory {
 		else {
 			Program p = data.getProgram();
 			data = p.getListing().getDefinedDataContaining(addr);
-			if (data == null || !data.isStructure()) {
+			if (data == null || !(data.isStructure() || data.isDynamic())) {
 				return null;
 			}
 			Symbol s = p.getSymbolTable().getPrimarySymbol(data.getAddress());
@@ -297,11 +297,15 @@ public class PreCommentFieldFactory extends FieldFactory {
 	private String[] buildFlexArrayComment(Data data, int levelsToIgnore, String label) {
 
 		DataType dt = data.getBaseDataType();
-		if (!(dt instanceof Structure)) {
+
-			return null;
+		DataTypeComponent flexComponent = null;
+		if (dt instanceof Structure) {
+			flexComponent = ((Structure) dt).getFlexibleArrayComponent();
+		}
+		else if (dt instanceof DynamicDataType) {
+			flexComponent = ((DynamicDataType) dt).getFlexibleArrayComponent(data);
 		}
 
-		DataTypeComponent flexComponent = ((Structure) dt).getFlexibleArrayComponent();
 		if (flexComponent == null) {
 			return null;
 		}

Ghidra/Features/Base/src/test.slow/java/ghidra/program/database/data/BitFieldListingDisplayTest.java

@@ -15,17 +15,19 @@
  */
 package ghidra.program.database.data;
 
-import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.*;
 
 import org.junit.*;
 
 import ghidra.app.plugin.core.codebrowser.CodeBrowserPlugin;
+import ghidra.docking.settings.Settings;
 import ghidra.framework.plugintool.PluginTool;
 import ghidra.program.database.ProgramBuilder;
 import ghidra.program.database.ProgramDB;
 import ghidra.program.model.address.Address;
 import ghidra.program.model.address.AddressSpace;
 import ghidra.program.model.data.*;
+import ghidra.program.model.mem.MemBuffer;
 import ghidra.test.AbstractGhidraHeadedIntegrationTest;
 import ghidra.test.TestEnv;
 import ghidra.util.task.TaskMonitor;
@@ -50,19 +52,14 @@ public class BitFieldListingDisplayTest extends AbstractGhidraHeadedIntegrationT
 		program.getMemory().createInitializedBlock("m", addr(0x1000), 0x100, (byte) 0,
 			TaskMonitor.DUMMY, false);
 
-		struct = createStructure("Test", 0);
+		program.getMemory()
-		struct.setPackingEnabled(true);
+				.setBytes(addr(0x1010),
-		struct.addBitField(IntegerDataType.dataType, 3, "bf1", "Nuts");
+					new byte[] { 0x12, 0x34, 0x45, 0x67, (byte) 0x89, (byte) 0xab, (byte) 0xcd,
-		struct.addBitField(IntegerDataType.dataType, 24, "bf2", null);
+						(byte) 0xef, 0x12, 0x34, 0x45, 0x67, (byte) 0x89, (byte) 0xab, (byte) 0xcd,
-		struct.addBitField(IntegerDataType.dataType, 4, "bf3", null);
+						(byte) 0xef });
-		struct.addBitField(IntegerDataType.dataType, 12, "bf4", null);
+
-		struct.addBitField(IntegerDataType.dataType, 3, "bf4a", null);
+		struct =
-		struct.addBitField(IntegerDataType.dataType, 3, "bf5", null);
+			(Structure) getDataTypeManager().resolve(createStructure(getDataTypeManager()), null);
-		struct.addBitField(IntegerDataType.dataType, 3, "b6", null);
-		struct.add(new ByteDataType(), "field0", "Comment1");
-		struct.add(new WordDataType(), null, "Comment2");
-		struct.add(new DWordDataType(), "field3", null);
-		struct.add(new ByteDataType(), "field4", "Comment4");
 
 		program.getListing().createData(addr(0x1010), struct);
 		env = new TestEnv();
@@ -70,6 +67,30 @@ public class BitFieldListingDisplayTest extends AbstractGhidraHeadedIntegrationT
 		plugin = getPlugin(tool, CodeBrowserPlugin.class);
 	}
 
+	private static Structure createStructure(DataTypeManager dtm) throws InvalidDataTypeException {
+
+		EnumDataType e = new EnumDataType("MyEnum", 1);
+		e.add("A", 1);
+		e.add("B", 2);
+		e.add("C", 4);
+
+		Structure struct = new StructureDataType("Test", 0, dtm);
+		struct.setPackingEnabled(true);
+		struct.addBitField(IntegerDataType.dataType, 3, "bf1", "Nuts");
+		struct.addBitField(IntegerDataType.dataType, 24, "bf2", null);
+		struct.addBitField(IntegerDataType.dataType, 4, "bf3", null);
+		struct.addBitField(IntegerDataType.dataType, 12, "bf4", null);
+		struct.addBitField(e, 3, "bf4a", null);
+		struct.addBitField(e, 3, "bf5", null);
+		struct.addBitField(e, 3, "b6", null);
+		struct.add(new ByteDataType(), "field0", "Comment1");
+		struct.add(new WordDataType(), null, "Comment2");
+		struct.add(new DWordDataType(), "field3", null);
+		struct.add(new ByteDataType(), "field4", "Comment4");
+//		struct.setFlexibleArrayComponent(CharDataType.dataType, "flex", "Flex Comment");
+		return struct;
+	}
+
 	private Address addr(long value) {
 		return space.getAddress(value);
 	}
@@ -80,10 +101,6 @@ public class BitFieldListingDisplayTest extends AbstractGhidraHeadedIntegrationT
 		env.dispose();
 	}
 
-	protected Structure createStructure(String name, int length) {
-		return (Structure) getDataTypeManager().resolve(new StructureDataType(name, length), null);
-	}
-
 	protected DataTypeManager getDataTypeManager() {
 		return program.getDataTypeManager();
 	}
@@ -97,20 +114,44 @@ public class BitFieldListingDisplayTest extends AbstractGhidraHeadedIntegrationT
 	}
 
 	@Test
-	public void testBitField() throws Exception {
+	public void testStructureBitFields() throws Exception {
 		openStructure(addr(0x1010));
 		assertMnemonic("Test", addr(0x1010), 0);
-		assertMnemonic("int:3", addr(0x1010), 1);
+		assertComponents();
-		assertMnemonic("int:24", addr(0x1010), 2);
+	}
-		assertMnemonic("int:4", addr(0x1013), 0);
-		assertMnemonic("int:12", addr(0x1014), 0);
-		assertMnemonic("int:3", addr(0x1015), 0);
-		assertMnemonic("int:3", addr(0x1015), 1);
-		assertMnemonic("int:3", addr(0x1016), 0);
-		assertMnemonic("db", addr(0x1017), 0);
-		assertMnemonic("dw", addr(0x1018), 0);
 
-		System.out.println("wait");
+	@Test
+	public void testDynamicBitFields() throws Exception {
+
+		program.getListing().clearCodeUnits(addr(0x1010), addr(0x1010), false);
+		program.getListing().createData(addr(0x1010), new BitfieldDType(getDataTypeManager()));
+
+		waitForSwing();
+
+		openStructure(addr(0x1010));
+		assertMnemonic("BitfieldDType", addr(0x1010), 0);
+		assertComponents();
+	}
+
+	private void assertComponents() {
+		assertMnemonic("int:3", addr(0x1010), 1);
+		assertOperand("0h", addr(0x1010), 1);
+		assertMnemonic("int:24", addr(0x1010), 2);
+		assertOperand("91A22Bh", addr(0x1010), 2);
+		assertMnemonic("int:4", addr(0x1013), 0);
+		assertOperand("3h", addr(0x1013), 0);
+		assertMnemonic("int:12", addr(0x1014), 0);
+		assertOperand("89Ah", addr(0x1014), 0);
+		assertMnemonic("MyEnum:3", addr(0x1015), 0);
+		assertOperand("A | C", addr(0x1015), 0);
+		assertMnemonic("MyEnum:3", addr(0x1016), 0);
+		assertOperand("B | C", addr(0x1016), 0);
+		assertMnemonic("MyEnum:3", addr(0x1016), 1);
+		assertOperand("A | B", addr(0x1016), 1);
+		assertMnemonic("db", addr(0x1017), 0);
+		assertOperand("EFh", addr(0x1017), 0);
+		assertMnemonic("dw", addr(0x1018), 0);
+		assertOperand("1234h", addr(0x1018), 0);
 	}
 
 	private void assertMnemonic(String expectedValue, Address addr, int occurrence) {
@@ -118,6 +159,11 @@ public class BitFieldListingDisplayTest extends AbstractGhidraHeadedIntegrationT
 		assertEquals(expectedValue, plugin.getCurrentFieldText());
 	}
 
+	private void assertOperand(String expectedValue, Address addr, int occurrence) {
+		plugin.goToField(addr, "Operands", occurrence, 0, 0);
+		assertEquals(expectedValue, plugin.getCurrentFieldText());
+	}
+
 	private void openStructure(Address address) {
 		// open the structure
 		plugin.goToField(address, "+", 0, 0);
@@ -126,4 +172,57 @@ public class BitFieldListingDisplayTest extends AbstractGhidraHeadedIntegrationT
 
 	}
 
+	public static class BitfieldDType extends DynamicDataType {
+
+		public BitfieldDType() {
+			this(null);
+		}
+
+		public BitfieldDType(DataTypeManager dtm) {
+			super("BitfieldDType", dtm);
+		}
+
+		@Override
+		public DataType clone(DataTypeManager dtm) {
+			if (dtm == getDataTypeManager()) {
+				return this;
+			}
+			return new BitfieldDType(dtm);
+		}
+
+		@Override
+		public String getDescription() {
+			return "BitfieldDType ";
+		}
+
+		@Override
+		public String getRepresentation(MemBuffer buf, Settings settings, int length) {
+			return "";
+		}
+
+		@Override
+		public Object getValue(MemBuffer buf, Settings settings, int length) {
+			return null;
+		}
+
+		@Override
+		protected DataTypeComponent[] getAllComponents(MemBuffer buf) {
+			try {
+				Structure struct = createStructure(dataMgr);
+				DataTypeComponent[] components = struct.getComponents();
+				if (struct.hasFlexibleArrayComponent()) {
+					DataTypeComponent[] newArray = new DataTypeComponent[components.length + 1];
+					System.arraycopy(components, 0, newArray, 0, components.length);
+					newArray[components.length] = struct.getFlexibleArrayComponent();
+					components = newArray;
+				}
+				return components;
+			}
+			catch (InvalidDataTypeException e) {
+				return null; // test should fail as a result
+			}
+		}
+
+	}
+
 }

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/util/PseudoData.java

@@ -330,7 +330,9 @@ public class PseudoData extends PseudoCodeUnit implements Data {
 			Structure struct = (Structure) baseDataType;
 			DataTypeComponent dtc = struct.getComponentAt(offset);
 			// Logic handles overlapping bit-fields
-			while (dtc != null && offset <= (dtc.getOffset() + dtc.getLength() - 1)) {
+			// Include if offset is contained within bounds of component
+			while (dtc != null && (offset >= dtc.getOffset()) &&
+				(offset <= (dtc.getOffset() + dtc.getLength() - 1))) {
 				int ordinal = dtc.getOrdinal();
 				list.add(getComponent(ordinal++));
 				dtc = ordinal < struct.getNumComponents() ? struct.getComponent(ordinal) : null;
@@ -339,8 +341,13 @@ public class PseudoData extends PseudoCodeUnit implements Data {
 		else if (baseDataType instanceof DynamicDataType) {
 			DynamicDataType ddt = (DynamicDataType) baseDataType;
 			DataTypeComponent dtc = ddt.getComponentAt(offset, this);
-			if (dtc != null) {
+			// Logic handles overlapping bit-fields
-				list.add(getComponent(dtc.getOrdinal()));
+			// Include if offset is contained within bounds of component
+			while (dtc != null && (offset >= dtc.getOffset()) &&
+				(offset <= (dtc.getOffset() + dtc.getLength() - 1))) {
+				int ordinal = dtc.getOrdinal();
+				list.add(getComponent(ordinal++));
+				dtc = ordinal < ddt.getNumComponents(this) ? ddt.getComponent(ordinal, this) : null;
 			}
 		}
 		else if (baseDataType instanceof Union) {

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/code/DataDB.java

@@ -614,7 +614,7 @@ class DataDB extends CodeUnitDB implements Data {
 				Structure struct = (Structure) baseDataType;
 				DataTypeComponent dtc = struct.getComponentAt(offset);
 				// Logic handles overlapping bit-fields
-				// Include if offset is contains within bounds of component
+				// Include if offset is contained within bounds of component
 				while (dtc != null && (offset >= dtc.getOffset()) &&
 					(offset <= (dtc.getOffset() + dtc.getLength() - 1))) {
 					int ordinal = dtc.getOrdinal();
@@ -625,8 +625,14 @@ class DataDB extends CodeUnitDB implements Data {
 			else if (baseDataType instanceof DynamicDataType) {
 				DynamicDataType ddt = (DynamicDataType) baseDataType;
 				DataTypeComponent dtc = ddt.getComponentAt(offset, this);
-				if (dtc != null) {
+				// Logic handles overlapping bit-fields
-					list.add(getComponent(dtc.getOrdinal()));
+				// Include if offset is contained within bounds of component
+				while (dtc != null && (offset >= dtc.getOffset()) &&
+					(offset <= (dtc.getOffset() + dtc.getLength() - 1))) {
+					int ordinal = dtc.getOrdinal();
+					list.add(getComponent(ordinal++));
+					dtc = ordinal < ddt.getNumComponents(this) ? ddt.getComponent(ordinal, this)
+							: null;
 				}
 			}
 			else if (baseDataType instanceof Union) {

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/data/EnumDB.java

@@ -499,7 +499,7 @@ class EnumDB extends DataTypeDB implements Enum {
 
 	private List<BitGroup> getBitGroups() {
 		if (bitGroups == null) {
-			bitGroups = EnumValuePartitioner.partition(getValues());
+			bitGroups = EnumValuePartitioner.partition(getValues(), getLength());
 		}
 		return bitGroups;
 	}

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/data/BitFieldDataType.java

@@ -355,18 +355,19 @@ public class BitFieldDataType extends AbstractDataType {
 		if (effectiveBitSize == 0) {
 			return new Scalar(0, 0);
 		}
-		BigInteger big = getBigIntegerValue(buf, settings);
+		AbstractIntegerDataType primitiveBaseDataType = getPrimitiveBaseDataType();
+		boolean isSigned = primitiveBaseDataType.isSigned();
+		BigInteger big = getBigIntegerValue(buf, isSigned, settings);
 		if (big == null) {
 			return null;
 		}
 		if (effectiveBitSize <= 64) {
-			return new Scalar(effectiveBitSize, big.longValue(),
+			return new Scalar(effectiveBitSize, big.longValue(), isSigned);
-				getPrimitiveBaseDataType().isSigned());
 		}
 		return big;
 	}
 
-	private BigInteger getBigIntegerValue(MemBuffer buf, Settings settings) {
+	private BigInteger getBigIntegerValue(MemBuffer buf, boolean isSigned, Settings settings) {
 		if (effectiveBitSize == 0) {
 			return BigInteger.ZERO;
 		}
@@ -385,7 +386,7 @@ public class BitFieldDataType extends AbstractDataType {
 			BigInteger pow = BigInteger.valueOf(2).pow(effectiveBitSize);
 			BigInteger mask = pow.subtract(BigInteger.ONE);
 			big = big.shiftRight(bitOffset).and(mask);
-			if (big.testBit(effectiveBitSize - 1)) {
+			if (isSigned && big.testBit(effectiveBitSize - 1)) {
 				big = big.subtract(pow);
 			}
 			return big;
@@ -406,7 +407,9 @@ public class BitFieldDataType extends AbstractDataType {
 		if (bitSize == 0) {
 			return "";
 		}
-		BigInteger big = getBigIntegerValue(buf, settings);
+		AbstractIntegerDataType primitiveBaseDataType = getPrimitiveBaseDataType();
+		boolean isSigned = primitiveBaseDataType.isSigned();
+		BigInteger big = getBigIntegerValue(buf, isSigned, settings);
 		if (big == null) {
 			return "??";
 		}

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/data/DynamicDataType.java

@@ -18,6 +18,7 @@ package ghidra.program.model.data;
 import ghidra.docking.settings.SettingsImpl;
 import ghidra.program.model.address.Address;
 import ghidra.program.model.mem.MemBuffer;
+import ghidra.util.Msg;
 import ghidra.util.datastruct.SoftCacheMap;
 
 /**
@@ -52,10 +53,8 @@ public abstract class DynamicDataType extends BuiltIn implements Dynamic {
 
 	/**
 	 * Gets the number of component data types in this data type.
-	 * @param buf a membuffer to be used by dataTypes that change depending on
+	 * @param buf a memory buffer to be used by dataTypes that change depending on
-	 * their data context.  A null value is acceptable to indicate that a memory
+	 * their data context. 
-	 * context is not available.  DataTypes that need a context will return -1
-	 * if the context is null.
 	 * @return the number of components that make up this data prototype
 	 *   - if this is an Array, return the number of elements in the array.
 	 *   - if this datatype is a subcomponent of another datatype and it
@@ -63,11 +62,13 @@ public abstract class DynamicDataType extends BuiltIn implements Dynamic {
 	 */
 	public final int getNumComponents(MemBuffer buf) {
 		DataTypeComponent[] comps = getComps(buf);
-		if (comps != null) {
+		if (comps == null || comps.length == 0) {
-			return comps.length;
-		}
 			return -1;
 		}
+		DataTypeComponent last = comps[comps.length - 1];
+		return (last != null && last.isFlexibleArrayComponent()) ? (comps.length - 1)
+				: comps.length;
+	}
 
 	protected DataTypeComponent[] getComps(MemBuffer buf) {
 		Address addr = buf.getAddress();
@@ -78,6 +79,15 @@ public abstract class DynamicDataType extends BuiltIn implements Dynamic {
 				// data-type not valid at buf location
 				return null;
 			}
+			for (int i = 0; i < comps.length - 1; i++) {
+				// TODO: should we verify ordinals
+				if (comps[i] != null && comps[i].isFlexibleArrayComponent()) {
+					// Only the last component may be a flexible array
+					Msg.error(this,
+						getClass().getName() + " produced invalid flexible array component");
+					return null;
+				}
+			}
 			map.put(addr, comps);
 		}
 		return comps;
@@ -85,67 +95,69 @@ public abstract class DynamicDataType extends BuiltIn implements Dynamic {
 
 	/**
 	 * Returns the immediate n'th component of this data type.
-	 * @param index the components index (zero based).
+	 * @param ordinal the components ordinal (zero based).
-	 * @param buf a membuffer to be used by dataTypes that change depending on
+	 * @param buf a memory buffer to be used by dataTypes that change depending on
-	 * their data context.  A null value is acceptable to indicate that a memory
+	 * their data context.
-	 * context is not available.  DataTypes that need a context will return -1
-	 * if the context is null.
 	 * @return the component data type or null if there is no component at the 
 	 * indicated index.
+	 * @throws ArrayIndexOutOfBoundsException if index is out of bounds
 	 */
-	public final DataTypeComponent getComponent(int index, MemBuffer buf) {
+	public final DataTypeComponent getComponent(int ordinal, MemBuffer buf) {
 		DataTypeComponent[] comps = getComps(buf);
 		if (comps != null) {
-			return comps[index];
+			DataTypeComponent dtc = comps[ordinal];
+			if (dtc != null && !dtc.isFlexibleArrayComponent()) {
+				return dtc;
+			}
 		}
 		return null;
 	}
 
 	/**
-	 * Returns an array of DataTypes that make up this data type.
+	 * Returns an array of components that make up this data type.
-	 * Could return null if there are no subcomponents.
+	 * Could return null if there are no subcomponents.  The last component
-	 * If this is an Array, then only one element will be returned
+	 * in the array may be a flexible array component.
-	 * which is the Data Prototype for the elements in the array.
+	 * @param buf a memory buffer to be used by dataTypes that change depending on
-	 * Will return null if this is a subcomponent that doesn't fit in it's
+	 * their data context.
-	 * alloted space.
+	 * @return datatype component array or null.  Last component may be a flexible array component.
-	 * @param buf a membuffer to be used by dataTypes that change depending on
-	 * their data context.  A null value is acceptable to indicate that a memory
-	 * context is not available.  DataTypes that need a context will return -1
-	 * if the context is null.
 	 */
 	public final DataTypeComponent[] getComponents(MemBuffer buf) {
 		return getComps(buf);
 	}
 
 	/**
-	 * Returns the component containing the byte at the given offset
+	 * Returns the first component containing the byte at the given offset
 	 * @param offset the offset into the dataType
-	 * @param buf the memoryBuffer containing the bytes.
+	 * @param buf the memory buffer containing the bytes.
-	 * @return the component containing the byte at the given offset
+	 * @return the component containing the byte at the given offset or null if no
+	 * component defined.
 	 */
 	public final DataTypeComponent getComponentAt(int offset, MemBuffer buf) {
 		DataTypeComponent[] comps = getComps(buf);
 		if (comps == null) {
 			return null;
 		}
-		for (int i = 0; i < comps.length; i++) {
+		// TODO: could use binary search (watchout for bitfields at same offset)
-			if (comps[i].getOffset() > offset) {
+		for (DataTypeComponent comp : comps) {
-				return comps[i - 1];
+			if (comp == null) {
+				continue;
 			}
-		}
+			if (comp.isFlexibleArrayComponent()) {
-		int index = comps.length - 1;
-		if (index < 0) {
 				return null;
 			}
-		return comps[index];
+			if (offset >= comp.getOffset() &&
-
+				(offset <= (comp.getOffset() + comp.getLength() - 1))) {
+				return comp;
+			}
+		}
+		return null;
 	}
 
 	/**
 	 * Get all dynamic components associated with the specified MemBuffer
 	 * @param buf memory buffer positioned at start of data type instance
 	 * @return all components or null if memory data is not valid for this
-	 * data type.
+	 * data type.  Last component may be a flexible array component.
 	 */
 	protected abstract DataTypeComponent[] getAllComponents(MemBuffer buf);
 
@@ -156,8 +168,8 @@ public abstract class DynamicDataType extends BuiltIn implements Dynamic {
 			return -1;
 		}
 		DataTypeComponent last = comps[comps.length - 1];
-		if (last == null) {
+		if (last != null && last.isFlexibleArrayComponent()) {
-			return -1;
+			return last.getOffset();
 		}
 		return last.getOffset() + last.getLength();
 	}
@@ -175,4 +187,20 @@ public abstract class DynamicDataType extends BuiltIn implements Dynamic {
 	public DataType getReplacementBaseType() {
 		return ByteDataType.dataType;
 	}
+
+	/**
+	 * Get trailing flexible array component.
+	 * @return flexible array component or null if not applicable or valie.
+	 */
+	public final DataTypeComponent getFlexibleArrayComponent(MemBuffer buf) {
+		DataTypeComponent[] comps = getComps(buf);
+		if (comps == null || comps.length == 0) {
+			return null;
+		}
+		DataTypeComponent last = comps[comps.length - 1];
+		if (last != null && last.isFlexibleArrayComponent()) {
+			return last;
+		}
+		return null;
+	}
 }

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/data/EnumDataType.java

@@ -318,7 +318,7 @@ public class EnumDataType extends GenericDataType implements Enum {
 
 	private List<BitGroup> getBitGroups() {
 		if (bitGroups == null) {
-			bitGroups = EnumValuePartitioner.partition(getValues());
+			bitGroups = EnumValuePartitioner.partition(getValues(), getLength());
 		}
 		return bitGroups;
 	}

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/data/EnumValuePartitioner.java

@@ -38,9 +38,10 @@ public class EnumValuePartitioner {
 	/**
 	 * Partition the given values into a list of non-intersecting BitGroups.
 	 * @param values the values to be partitioned.
+	 * @param size size of enum value in bytes
 	 * @return a list of BitGroups with non-intersecting bits.
 	 */
-	public static List<BitGroup> partition(long[] values) {
+	public static List<BitGroup> partition(long[] values, int size) {
 		List<BitGroup> list = new LinkedList<>();
 		long totalMask = 0;
 		for (long value : values) {
@@ -49,7 +50,8 @@ public class EnumValuePartitioner {
 			merge(list, bitGroup);
 		}
 		// now create a BitGroup for all bits not accounted for
-		list.add(new BitGroup(~totalMask));
+		long enumMask = ~(-1 << (size * 8));
+		list.add(new BitGroup(~totalMask & enumMask));
 
 		return list;
 	}

Ghidra/Framework/SoftwareModeling/src/test/java/ghidra/program/model/data/BitFieldDataTypeTest.java

@@ -67,6 +67,16 @@ public class BitFieldDataTypeTest extends AbstractGTest {
 		BitFieldDataType bf = new BitFieldDataType(typeDef, 1);
 		assertEquals(typeDef, bf.getBaseDataType());
 		assertEquals(typeDef, bf.clone(null).getBaseDataType());
+
+		EnumDataType enumDt = new EnumDataType("MyEnum", 1);
+		enumDt.add("A", 0);
+		enumDt.add("B", 1);
+		enumDt.add("C", 2);
+		enumDt.add("D", 4);
+		bf = new BitFieldDataType(enumDt, 4);
+		assertEquals(enumDt, bf.getBaseDataType());
+		assertEquals(enumDt, bf.clone(null).getBaseDataType());
+
 	}
 
 	@Test
@@ -157,6 +167,21 @@ public class BitFieldDataTypeTest extends AbstractGTest {
 		assertEquals("5", getDecimalRepresentation(unsignedBitField(4, 0), 0x55));
 	}
 
+	@Test
+	public void testEnumRepresentation() throws Exception {
+
+		EnumDataType enumDt = new EnumDataType("MyEnum", 1);
+		enumDt.add("A", 1);
+		enumDt.add("B", 2);
+		enumDt.add("C", 4);
+		enumDt.add("D", 8);
+		BitFieldDataType bf = new BitFieldDataType(enumDt, 4);
+		assertEquals(enumDt, bf.getBaseDataType());
+		assertEquals(enumDt, bf.clone(null).getBaseDataType());
+
+		assertEquals("A | B | C | D", getRepresentation(bf, 0x0f));
+	}
+
 	private String getRepresentation(BitFieldDataType bitField, int... unsignedBytes)
 			throws Exception {
 		MemBuffer membuf = membuf(unsignedBytes);

Ghidra/Framework/SoftwareModeling/src/test/java/ghidra/program/model/data/EnumValuePartitionerTest.java

@@ -15,8 +15,7 @@
  */
 package ghidra.program.model.data;
 
-import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.*;
-import static org.junit.Assert.assertTrue;
 
 import java.util.List;
 import java.util.Set;
@@ -29,13 +28,13 @@ public class EnumValuePartitionerTest extends AbstractGTest {
 
 	@Test
 	public void testDisjointValues() {
-		List<BitGroup> list = EnumValuePartitioner.partition(new long[] { 1, 2, 4, 8 });
+		List<BitGroup> list = EnumValuePartitioner.partition(new long[] { 1, 2, 4, 8 }, 1);
 		assertEquals(5, list.size());
 	}
 
 	@Test
 	public void testAllOverlappingValues() {
-		List<BitGroup> list = EnumValuePartitioner.partition(new long[] { 1, 2, 4, 8, 15 });
+		List<BitGroup> list = EnumValuePartitioner.partition(new long[] { 1, 2, 4, 8, 15 }, 1);
 		assertEquals(2, list.size());
 		BitGroup group = list.get(0);
 		assertEquals(15, group.getMask());
@@ -50,7 +49,7 @@ public class EnumValuePartitionerTest extends AbstractGTest {
 
 	@Test
 	public void testSomeOverlappingValues() {
-		List<BitGroup> list = EnumValuePartitioner.partition(new long[] { 1, 2, 4, 8, 6 });
+		List<BitGroup> list = EnumValuePartitioner.partition(new long[] { 1, 2, 4, 8, 6 }, 1);
 		assertEquals(4, list.size());
 		assertEquals(1, list.get(0).getMask());
 		assertEquals(8, list.get(1).getMask());