GP-3632 revised datatype resolve with improved conflict resolution. Added standard DataType name comparators with improved sort. Corrected dataTypeReplaced handling for pointers and arrays to avoid type duplication.

Ghidra/Debug/Framework-TraceModeling/src/main/java/ghidra/trace/database/data/DBTraceDataTypeManager.java

@@ -193,9 +193,8 @@ public class DBTraceDataTypeManager extends ProgramBasedDataTypeManagerDB
 	}
 
 	@Override
-	protected void deleteDataTypeIDs(LinkedList<Long> deletedIds, TaskMonitor monitor)
+	protected void deleteDataTypeIDs(LinkedList<Long> deletedIds) {
-			throws CancelledException {
+		trace.getCodeManager().clearData(deletedIds, TaskMonitor.DUMMY);
-		trace.getCodeManager().clearData(deletedIds, monitor);
 		trace.getSymbolManager().invalidateCache(false);
 	}
 

Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/analysis/DefaultDataTypeManagerService.java

@@ -22,10 +22,8 @@ import javax.swing.tree.TreePath;
 
 import ghidra.app.plugin.core.datamgr.archive.BuiltInSourceArchive;
 import ghidra.app.plugin.core.datamgr.archive.DefaultDataTypeArchiveService;
-import ghidra.app.plugin.core.datamgr.util.DataTypeComparator;
 import ghidra.app.services.DataTypeManagerService;
-import ghidra.program.model.data.DataType;
+import ghidra.program.model.data.*;
-import ghidra.program.model.data.DataTypeManagerChangeListener;
 import ghidra.util.HelpLocation;
 
 // FIXME!! TESTING
@@ -83,9 +81,8 @@ public class DefaultDataTypeManagerService extends DefaultDataTypeArchiveService
 	public List<DataType> getSortedDataTypeList() {
 		List<DataType> dataTypes =
 			builtInDataTypesManager.getDataTypes(BuiltInSourceArchive.INSTANCE);
-		dataTypes.sort(new DataTypeComparator());
+		dataTypes.sort(DataTypeComparator.INSTANCE);
 		return dataTypes;
-//		throw new UnsupportedOperationException();
 	}
 
 	@Override

Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/datamgr/archive/DataTypeIndexer.java

@@ -19,7 +19,6 @@ import java.util.*;
 
 import javax.swing.SwingUtilities;
 
-import ghidra.app.plugin.core.datamgr.util.DataTypeComparator;
 import ghidra.program.model.data.*;
 import ghidra.util.task.*;
 
@@ -32,7 +31,6 @@ import ghidra.util.task.*;
 public class DataTypeIndexer {
 	private List<DataTypeManager> dataTypeManagers = new ArrayList<>();
 	private List<DataType> dataTypeList = Collections.emptyList();
-	private Comparator<DataType> dataTypeComparator = new DataTypeComparator();
 	private DataTypeIndexUpdateListener listener = new DataTypeIndexUpdateListener();
 
 	private volatile boolean isStale = true;
@@ -59,7 +57,8 @@ public class DataTypeIndexer {
 
 	/**
 	 * Returns a sorted list of the data types open in the current tool.  The sorting of the list
-	 * is done using the {@link DataTypeComparator}.
+	 * is done using the {@link DataTypeComparator} whose primary sort is based upon the 
+	 * {@link DataTypeNameComparator}.
 	 *
 	 * @return a sorted list of the data types open in the current tool.
 	 */
@@ -128,16 +127,13 @@ public class DataTypeIndexer {
 			monitor.initialize(dataTypeManagers.size());
 			monitor.setMessage("Preparing to index data types...");
 
-			Iterator<DataTypeManager> iterator = dataTypeManagers.iterator();
+			for (DataTypeManager dataTypeManager : dataTypeManagers) {
-			while (iterator.hasNext()) {
-				DataTypeManager dataTypeManager = iterator.next();
-
 				monitor.setMessage("Searching " + dataTypeManager.getName());
 				dataTypeManager.getAllDataTypes(list);
 				monitor.incrementProgress(1);
 			}
 
-			Collections.sort(list, dataTypeComparator);
+			Collections.sort(list, DataTypeComparator.INSTANCE);
 		}
 
 		List<DataType> getList() {

Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/datamgr/tree/DataTypeNode.java

@@ -50,8 +50,9 @@ public class DataTypeNode extends DataTypeTreeNode {
 
 	@Override
 	public int compareTo(GTreeNode node) {
-		if (node instanceof DataTypeNode) {
+		if (node instanceof DataTypeNode other) {
-			return super.compareTo(node);
+			return DataTypeNameComparator.INSTANCE.compare(dataType.getName(),
+				other.dataType.getName());
 		}
 
 		return 1; // DataTypeNodes always come after ****everything else****

Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/datamgr/util/DataTypeComparator.java

@@ -1,52 +0,0 @@
-/* ###
- * IP: GHIDRA
- * REVIEWED: YES
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- * 
- *      http://www.apache.org/licenses/LICENSE-2.0
- * 
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package ghidra.app.plugin.core.datamgr.util;
-
-import ghidra.program.model.data.DataType;
-
-import java.util.Comparator;
-
-public class DataTypeComparator implements Comparator<DataType> {
-
-    public int compare(DataType dt1, DataType dt2) {
-        String name1 = dt1.getName();
-        String name2 = dt2.getName();
-
-// TODO: should built-ins always come first in the list? (in case we have an 'a' named archive?)        
-        
-        // if the names are the same, then sort by the path            
-        if ( name1.equalsIgnoreCase( name2 ) ) {
-
-            if ( !name1.equals( name2 ) ) {
-                // let equivalent names be sorted by case ('-' for lower-case first)
-                return -name1.compareTo( name2 );
-            }
-            
-            String dtmName1 = dt1.getDataTypeManager().getName();
-            String dtmName2 = dt2.getDataTypeManager().getName();
-
-            // if they have the same name, and are in the same DTM, then compare paths
-            if ( dtmName1.equalsIgnoreCase( dtmName2 ) ) {
-                return dt1.getPathName().compareToIgnoreCase( dt2.getPathName() );
-            }
-
-            return dtmName1.compareToIgnoreCase( dtmName2 );
-        }
-
-        return name1.compareToIgnoreCase( name2 );
-    }
-}

Ghidra/Features/Base/src/main/java/ghidra/app/services/DataTypeQueryService.java

@@ -17,7 +17,7 @@ package ghidra.app.services;
 
 import java.util.List;
 
-import ghidra.program.model.data.DataType;
+import ghidra.program.model.data.*;
 
 /**
  * Simplified datatype service interface to provide query capabilities
@@ -28,7 +28,9 @@ public interface DataTypeQueryService {
 	/**
 	 * Gets the sorted list of all datatypes known by this service via it's owned DataTypeManagers.
 	 * This method can be called frequently, as the underlying data is indexed and only updated
-	 * as changes are made.
+	 * as changes are made.  The sorting of the list is done using the {@link DataTypeComparator} 
+	 * whose primary sort is based upon the {@link DataTypeNameComparator}.
+	 * 
 	 * @return the sorted list of known data types.
 	 */
 	public List<DataType> getSortedDataTypeList();

Ghidra/Features/Base/src/test.slow/java/ghidra/app/plugin/core/compositeeditor/StructureEditorUnlockedCellEdit2Test.java

@@ -27,8 +27,7 @@ import org.junit.Test;
 import generic.test.ConcurrentTestExceptionHandler;
 import ghidra.program.model.data.*;
 
-public class StructureEditorUnlockedCellEdit2Test
+public class StructureEditorUnlockedCellEdit2Test extends AbstractStructureEditorTest {
-		extends AbstractStructureEditorTest {
 
 	@Test
 	public void testF2EditKey() throws Exception {
@@ -764,7 +763,7 @@ public class StructureEditorUnlockedCellEdit2Test
 		enter();
 		assertIsEditingField(rowNum, colNum);
 
-		assertEquals("simpleStructure doesn't fit within 4 bytes, need 29 bytes",
+		assertEquals("simpleStructure doesn't fit within 4 bytes, need 12 bytes",
 			model.getStatus());
 
 		escape();
@@ -778,9 +777,9 @@ public class StructureEditorUnlockedCellEdit2Test
 
 		DataType newDt = getDataType(22);
 		assertEquals("simpleStructure", newDt.getDisplayName());
-		assertEquals(29, newDt.getLength());
+		assertEquals(12, newDt.getLength());
-		assertEquals(29, getLength(22));
+		assertEquals(12, getLength(22));
-		assertEquals(350, model.getLength());
+		assertEquals(333, model.getLength());
 	}
 
 	@Override

Ghidra/Features/Base/src/test.slow/java/ghidra/app/plugin/core/compositeeditor/UnionEditorCellEditTest.java

@@ -304,8 +304,8 @@ public class UnionEditorCellEditTest extends AbstractUnionEditorTest {
 		init(simpleUnion, pgmBbCat, false);
 
 		startTransaction("addExternal");
-		ExternalLocation extLoc = program.getExternalManager().addExtFunction(Library.UNKNOWN,
+		ExternalLocation extLoc = program.getExternalManager()
-			"extLabel", null, SourceType.USER_DEFINED);
+				.addExtFunction(Library.UNKNOWN, "extLabel", null, SourceType.USER_DEFINED);
 		Function function = extLoc.createFunction();
 		endTransaction(true);
 
@@ -726,9 +726,9 @@ public class UnionEditorCellEditTest extends AbstractUnionEditorTest {
 		assertNotEditingField();
 		DataType newDt = getDataType(rowNum);
 		assertEquals("simpleStructure", newDt.getName());
-		assertEquals(29, newDt.getLength());
+		assertEquals(12, newDt.getLength());
-		assertEquals(29, getLength(rowNum));
+		assertEquals(12, getLength(rowNum));
-		assertEquals(29, model.getLength());
+		assertEquals(12, model.getLength());
 	}
 
 	@Test

Ghidra/Features/Base/src/test.slow/java/ghidra/app/util/parser/FunctionSignatureParserTest.java

@@ -60,7 +60,7 @@ public class FunctionSignatureParserTest extends AbstractGhidraHeadedIntegration
 				// with Tool-based service.
 				dtList = new ArrayList<>(super.getSortedDataTypeList());
 				program.getDataTypeManager().getAllDataTypes(dtList);
-				Collections.sort(dtList, new NameComparator());
+				Collections.sort(dtList, DataTypeComparator.INSTANCE);
 				return dtList;
 			}
 
@@ -83,17 +83,6 @@ public class FunctionSignatureParserTest extends AbstractGhidraHeadedIntegration
 		parser = new FunctionSignatureParser(program.getDataTypeManager(), service);
 	}
 
-	private class NameComparator implements Comparator<DataType> {
-		@Override
-		public int compare(DataType d1, DataType d2) {
-			int c = d1.getName().compareTo(d2.getName());
-			if (c == 0) {
-				return d1.getCategoryPath().compareTo(d2.getCategoryPath());
-			}
-			return c;
-		}
-	}
-
 	@Test
 	public void testSubstitute() {
 		assertEquals("barxxxbar", parser.substitute("barfoobar", "foo", "xxx"));
@@ -391,16 +380,16 @@ public class FunctionSignatureParserTest extends AbstractGhidraHeadedIntegration
 		FunctionSignature f = fun("int", "Bob");
 		FunctionDefinitionDataType dt =
 			parser.parse(f, "unsigned long[3] Foo(unsigned long long *, signed int[3], StructA*)");
-		assertTrue((new ArrayDataType(UnsignedLongDataType.dataType, 3, -1)).isEquivalent(
+		assertTrue((new ArrayDataType(UnsignedLongDataType.dataType, 3, -1))
-			dt.getReturnType()));
+				.isEquivalent(dt.getReturnType()));
 		assertEquals("Foo", dt.getName());
 		ParameterDefinition[] args = dt.getArguments();
 		assertEquals(3, args.length);
-		assertTrue((new PointerDataType(UnsignedLongLongDataType.dataType)).isEquivalent(
+		assertTrue((new PointerDataType(UnsignedLongLongDataType.dataType))
-			args[0].getDataType()));
+				.isEquivalent(args[0].getDataType()));
 		assertEquals("", args[0].getName());
-		assertTrue((new ArrayDataType(IntegerDataType.dataType, 3, -1)).isEquivalent(
+		assertTrue((new ArrayDataType(IntegerDataType.dataType, 3, -1))
-			args[1].getDataType()));
+				.isEquivalent(args[1].getDataType()));
 		assertEquals("", args[1].getName());
 		assertTrue(args[2].getDataType() instanceof Pointer);
 		assertEquals("", args[2].getName());
@@ -430,11 +419,11 @@ public class FunctionSignatureParserTest extends AbstractGhidraHeadedIntegration
 			"unsigned long[3] Bob(unsigned long long *foo, signed int[3] bar, StructA *s)");
 		ParameterDefinition[] args = dt.getArguments();
 		assertEquals(3, args.length);
-		assertTrue((new PointerDataType(UnsignedLongLongDataType.dataType)).isEquivalent(
+		assertTrue((new PointerDataType(UnsignedLongLongDataType.dataType))
-			args[0].getDataType()));
+				.isEquivalent(args[0].getDataType()));
 		assertEquals("foo", args[0].getName());
-		assertTrue((new ArrayDataType(IntegerDataType.dataType, 3, -1)).isEquivalent(
+		assertTrue((new ArrayDataType(IntegerDataType.dataType, 3, -1))
-			args[1].getDataType()));
+				.isEquivalent(args[1].getDataType()));
 		assertEquals("bar", args[1].getName());
 		assertTrue(args[2].getDataType() instanceof Pointer);
 		assertEquals("s", args[2].getName());

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

@@ -402,12 +402,7 @@ public class CategoryTest extends AbstractGhidraHeadedIntegrationTest {
 			assertTrue(dts[i].isEquivalent(newdts[i]));
 		}
 		DataType[] d = s.getDataTypes();
-		Arrays.sort(d, new Comparator<DataType>() {
+		Arrays.sort(d, DataTypeComparator.INSTANCE);
-			@Override
-			public int compare(DataType o1, DataType o2) {
-				return o1.getName().compareTo(o2.getName());
-			}
-		});
 		assertEquals(dts.length, d.length);
 		assertTrue(newdts[0] == d[0]);
 	}
@@ -852,7 +847,8 @@ public class CategoryTest extends AbstractGhidraHeadedIntegrationTest {
 		}
 
 		@Override
-		public void categoryRenamed(DataTypeManager dtm, CategoryPath oldPath, CategoryPath newPath) {
+		public void categoryRenamed(DataTypeManager dtm, CategoryPath oldPath,
+				CategoryPath newPath) {
 			events.add(new Event("Cat Renamed", null, newPath, oldPath.getName(), null));
 		}
 
@@ -877,12 +873,13 @@ public class CategoryTest extends AbstractGhidraHeadedIntegrationTest {
 
 		@Override
 		public void dataTypeRemoved(DataTypeManager dtm, DataTypePath path) {
-			events.add(new Event("DT Removed", path.getCategoryPath(), null,
+			events.add(new Event("DT Removed", path.getCategoryPath(), null, path.getDataTypeName(),
-				path.getDataTypeName(), null));
+				null));
 		}
 
 		@Override
-		public void dataTypeRenamed(DataTypeManager dtm, DataTypePath oldPath, DataTypePath newPath) {
+		public void dataTypeRenamed(DataTypeManager dtm, DataTypePath oldPath,
+				DataTypePath newPath) {
 			DataType dataType = dtm.getDataType(newPath);
 			events.add(new Event("DT Renamed", null, null, oldPath.getDataTypeName(), dataType));
 		}

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

@@ -17,6 +17,8 @@ package ghidra.program.database.data;
 
 import static org.junit.Assert.*;
 
+import java.util.ArrayList;
+
 import org.junit.*;
 
 import ghidra.program.database.ProgramBuilder;
@@ -26,6 +28,8 @@ import ghidra.program.model.data.DataTypeConflictHandler.ConflictResult;
 import ghidra.test.AbstractGhidraHeadedIntegrationTest;
 import ghidra.util.UniversalID;
 import ghidra.util.UniversalIdGenerator;
+import ghidra.util.exception.CancelledException;
+import ghidra.util.task.TaskMonitor;
 
 /**
  * Tests for the {@link DataTypeConflictHandler conflict handler} stuff.
@@ -523,17 +527,15 @@ public class ConflictHandlerTest extends AbstractGhidraHeadedIntegrationTest {
 
 			EnumDataType e = new EnumDataType(subc.getCategoryPath(), "Enum", 2);
 
-			DataType resolvedEnum =
+			DataType resolvedEnum = dtm.resolve(e,
-				dtm.resolve(e,
+				DataTypeConflictHandler.REPLACE_EMPTY_STRUCTS_OR_RENAME_AND_ADD_HANDLER);
-					DataTypeConflictHandler.REPLACE_EMPTY_STRUCTS_OR_RENAME_AND_ADD_HANDLER);
 			assertTrue(e.isEquivalent(resolvedEnum));
 			assertEquals("/subc/Enum", resolvedEnum.getPathName());
 
 			e.add("xyz", 1);
 
-			resolvedEnum =
+			resolvedEnum = dtm.resolve(e,
-				dtm.resolve(e,
+				DataTypeConflictHandler.REPLACE_EMPTY_STRUCTS_OR_RENAME_AND_ADD_HANDLER);
-					DataTypeConflictHandler.REPLACE_EMPTY_STRUCTS_OR_RENAME_AND_ADD_HANDLER);
 			assertTrue(e.isEquivalent(resolvedEnum));
 			assertEquals("/subc/Enum.conflict", resolvedEnum.getPathName());
 		}
@@ -597,9 +599,8 @@ public class ConflictHandlerTest extends AbstractGhidraHeadedIntegrationTest {
 	@Test
 	public void testResolveArrayConflict() {
 
-		DataType array1 =
+		DataType array1 = new ArrayDataType(
-			new ArrayDataType(new TypedefDataType("size_t", UnsignedIntegerDataType.dataType), 2,
+			new TypedefDataType("size_t", UnsignedIntegerDataType.dataType), 2, -1);
-				-1);
 		DataType array2 =
 			new ArrayDataType(new TypedefDataType("size_t", IntegerDataType.dataType), 2, -1);
 
@@ -616,6 +617,203 @@ public class ConflictHandlerTest extends AbstractGhidraHeadedIntegrationTest {
 		assertTrue(array2resolvedC == array2resolvedB);
 	}
 
+	@Test
+	public void testResolveWithCircularDependency() {
+
+		Structure struct1 = new StructureDataType("s1", 0, dataMgr);
+		struct1.setPackingEnabled(true);
+
+		Structure struct2 = new StructureDataType("s2", 0, dataMgr);
+		struct2.setPackingEnabled(true);
+
+		struct1.add(new PointerDataType(struct2));
+		struct2.add(new PointerDataType(struct1));
+
+		Structure struct1a = (Structure) dataMgr.resolve(struct1,
+			DataTypeConflictHandler.REPLACE_EMPTY_STRUCTS_OR_RENAME_AND_ADD_HANDLER);
+
+		Structure struct1b = (Structure) dataMgr.resolve(struct1,
+			DataTypeConflictHandler.REPLACE_EMPTY_STRUCTS_OR_RENAME_AND_ADD_HANDLER);
+
+		assertTrue(struct1a == struct1b);
+
+		assertEquals(5, dataMgr.getDataTypeRecordCount());
+	}
+
+	@Test
+	public void testComplexResolveWithConflictReplacement() {
+
+		// FIXME: Add typedef to struct1 pointer used as struct2 component
+		// FIXME: Add add array of struct1 pointers used as struct1 component
+
+		Structure struct1a = new StructureDataType("s1", 0, dataMgr);
+		struct1a.setPackingEnabled(true);
+		Structure struct2a = new StructureDataType("s2", 0, dataMgr);
+		struct2a.add(ByteDataType.dataType);
+		struct2a.add(new PointerDataType(struct1a, dataMgr));
+
+		struct1a.add(new PointerDataType(struct1a, dataMgr));
+		struct1a.add(new PointerDataType(struct2a, dataMgr));
+		struct1a.add(new ArrayDataType(struct2a, 2, -1, dataMgr));
+		struct1a.add(new TypedefDataType("S2TD", struct2a));
+
+		struct1a = (Structure) dataMgr.resolve(struct1a,
+			DataTypeConflictHandler.REPLACE_EMPTY_STRUCTS_OR_RENAME_AND_ADD_HANDLER);
+
+		Structure struct1b = new StructureDataType("s1", 0, dataMgr);
+		struct1b.setPackingEnabled(true);
+		Structure struct2b = new StructureDataType("s2", 0, dataMgr); // not-yet-defined - will get replaced by struct2a
+
+		struct1b.add(new PointerDataType(struct1b, dataMgr));
+		struct1b.add(new PointerDataType(struct2b, dataMgr));
+		struct1b.add(new ArrayDataType(struct2b, 2, -1, dataMgr));
+		struct1b.add(new TypedefDataType("S2TD", struct2b));
+
+		struct1b = (Structure) dataMgr.resolve(struct1b,
+			DataTypeConflictHandler.REPLACE_EMPTY_STRUCTS_OR_RENAME_AND_ADD_HANDLER);
+
+		assertTrue(struct1a == struct1b);
+
+		assertNoConflict("s1");
+		assertNoConflict("s2");
+	}
+
+	@Test
+	public void testComplexResolveWithConflictReplacement2() {
+
+		// FIXME: Add typedef to struct1 pointer used as struct2 component
+		// FIXME: Add add array of struct1 pointers used as struct1 component
+
+		Structure struct1a = new StructureDataType("s1", 0, dataMgr);
+		struct1a.setPackingEnabled(true);
+		Structure struct2a = new StructureDataType("s2", 0, dataMgr); // not-yet-defined - will get replaced by struct2b
+
+		struct1a.add(new PointerDataType(struct1a, dataMgr));
+		struct1a.add(new PointerDataType(struct2a, dataMgr));
+		struct1a.add(new ArrayDataType(struct2a, 2, -1, dataMgr));
+		struct1a.add(new TypedefDataType("S2TD", struct2a));
+
+		struct1a = (Structure) dataMgr.resolve(struct1a,
+			DataTypeConflictHandler.REPLACE_EMPTY_STRUCTS_OR_RENAME_AND_ADD_HANDLER);
+
+		System.out.println("-- After First Resolve --");
+		System.out.println(struct1a);
+		Pointer ptr2a = (Pointer) struct1a.getComponent(1).getDataType();
+		struct2a = (Structure) ptr2a.getDataType();
+		System.out.println(struct2a);
+
+		Structure struct1b = new StructureDataType("s1", 0, dataMgr);
+		struct1b.setPackingEnabled(true);
+		Structure struct2b = new StructureDataType("s2", 0, dataMgr);
+		struct2b.setPackingEnabled(true);
+		struct2b.add(ByteDataType.dataType);
+		struct2b.add(new PointerDataType(struct1b, dataMgr));
+
+		struct1b.add(new PointerDataType(struct1b, dataMgr));
+		struct1b.add(new PointerDataType(struct2b, dataMgr));
+		struct1b.add(new ArrayDataType(struct2b, 2, -1, dataMgr));
+		struct1b.add(new TypedefDataType("S2TD", struct2b));
+
+		struct1b = (Structure) dataMgr.resolve(struct1b,
+			DataTypeConflictHandler.REPLACE_EMPTY_STRUCTS_OR_RENAME_AND_ADD_HANDLER);
+
+		System.out.println("-- After Second Resolve (original instances - s2 content replaced) --");
+		System.out.println(struct1a);
+		System.out.println(struct2a);
+
+		System.out.println("-- After Second Resolve (bad s1.conflict) --");
+		System.out.println(struct1b);
+		Pointer ptr2b = (Pointer) struct1b.getComponent(1).getDataType();
+		struct2b = (Structure) ptr2b.getDataType();
+		System.out.println(struct2b);
+
+		// struct1a should get eliminated and replaced by struct1b
+		assertTrue(struct1a == struct1b);
+
+		assertNoConflict("s1");
+		assertNoConflict("s2");
+	}
+
+	@Test
+	public void testDedupeAllConflicts() throws CancelledException {
+
+		Structure struct1a = new StructureDataType("s1", 0, dataMgr);
+		struct1a.setPackingEnabled(true);
+
+		struct1a.add(ByteDataType.dataType);
+		Structure s1 = (Structure) dataMgr.resolve(struct1a, null);
+
+		struct1a.add(ByteDataType.dataType);
+		Structure s2 = (Structure) dataMgr.resolve(struct1a, null);
+
+		struct1a.add(ByteDataType.dataType);
+		Structure s3 = (Structure) dataMgr.resolve(struct1a, null);
+
+		// force all conflicts to become equivalent
+		s1.deleteAll();
+		s2.deleteAll();
+		s3.deleteAll();
+
+		ArrayList<DataType> list = new ArrayList<>();
+		dataMgr.findDataTypes("s1", list);
+		assertEquals(3, list.size());
+
+		dataMgr.dedupeAllConflicts(TaskMonitor.DUMMY);
+
+		list.clear();
+		dataMgr.findDataTypes("s1", list);
+		assertEquals(1, list.size());
+	}
+
+	@Test
+	public void testDedupeConflicts() {
+
+		Structure struct1a = new StructureDataType("s1", 0, dataMgr);
+		struct1a.setPackingEnabled(true);
+
+		struct1a.add(ByteDataType.dataType);
+		Structure s1 = (Structure) dataMgr.resolve(struct1a, null);
+
+		struct1a.add(ByteDataType.dataType);
+		Structure s2 = (Structure) dataMgr.resolve(struct1a, null);
+
+		struct1a.add(ByteDataType.dataType);
+		Structure s3 = (Structure) dataMgr.resolve(struct1a, null);
+
+		// force two of the conflicts to become equivalent
+		s1.deleteAll();
+		// leave s2 unchanged
+		s3.deleteAll();
+
+		ArrayList<DataType> list = new ArrayList<>();
+		dataMgr.findDataTypes("s1", list);
+		assertEquals(3, list.size());
+
+		dataMgr.dedupeConflicts(s3);
+		assertTrue(s3.isDeleted());
+
+		list.clear();
+		dataMgr.findDataTypes("s1", list);
+		assertEquals(2, list.size());
+	}
+
+	private void assertNoConflict(String dtName) {
+		DataType dt1 = dataMgr.getDataType("/" + dtName);
+		assertNotNull("DataType not found: " + dtName, dt1);
+
+		DataType dt2 = dataMgr.getDataType("/" + dtName + ".conflict");
+		if (dt2 != null) {
+			System.out.println("Original type: " + dt1.toString());
+			System.out.println("Conflict type: " + dt2.toString());
+
+			if (dt1.isEquivalent(dt2)) {
+				System.out.println(dtName + " - TYPES ARE EQUIVALENT");
+			}
+
+			fail("DataType conflict found: " + dt2.getPathName());
+		}
+	}
+
 	private static class DummySourceArchive implements SourceArchive {
 
 		private final UniversalID id;
@@ -626,36 +824,45 @@ public class ConflictHandlerTest extends AbstractGhidraHeadedIntegrationTest {
 			this.archiveName = archiveName;
 		}
 
+		@Override
 		public ArchiveType getArchiveType() {
 			return ArchiveType.FILE;
 		}
 
+		@Override
 		public String getDomainFileID() {
 			return null;
 		}
 
+		@Override
 		public long getLastSyncTime() {
 			return 0;
 		}
 
+		@Override
 		public String getName() {
 			return archiveName;
 		}
 
+		@Override
 		public UniversalID getSourceArchiveID() {
 			return id;
 		}
 
+		@Override
 		public boolean isDirty() {
 			return false;
 		}
 
+		@Override
 		public void setDirtyFlag(boolean dirty) {
 		}
 
+		@Override
 		public void setLastSyncTime(long time) {
 		}
 
+		@Override
 		public void setName(String name) {
 		}
 

Ghidra/Features/Base/src/test/java/ghidra/app/plugin/core/datamgr/util/DataTypeUtilsTest.java

@@ -21,9 +21,7 @@ import org.junit.Before;
 import org.junit.Test;
 
 import generic.test.AbstractGTest;
-import ghidra.program.model.data.DataType;
+import ghidra.program.model.data.*;
-import ghidra.program.model.data.DataTypeComparator;
-import ghidra.program.model.data.StubDataType;
 import ghidra.util.UniversalIdGenerator;
 
 public class DataTypeUtilsTest {
@@ -48,7 +46,7 @@ public class DataTypeUtilsTest {
 		}
 
 		// sort them how our data will be sorted
-		Collections.sort(data, new DataTypeComparator());
+		Collections.sort(data, DataTypeComparator.INSTANCE);
 		List<DataType> finalData = Collections.unmodifiableList(data);
 
 		// a

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/ProjectDataTypeManager.java

@@ -191,7 +191,7 @@ public class ProjectDataTypeManager extends StandAloneDataTypeManager
 	}
 
 	@Override
-	protected void deleteDataTypeIDs(LinkedList<Long> deletedIds, TaskMonitor monitor) {
+	protected void deleteDataTypeIDs(LinkedList<Long> deletedIds) {
 		// do nothing
 	}
 

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

@@ -98,7 +98,7 @@ class ArrayDB extends DataTypeDB implements Array {
 		lock.acquire();
 		try {
 			checkIsValid();
-			if ( displayName == null ) {
+			if (displayName == null) {
 				displayName = DataTypeUtilities.getDisplayName(this, false);
 			}
 			return displayName;
@@ -223,27 +223,45 @@ class ArrayDB extends DataTypeDB implements Array {
 	}
 
 	@Override
-	public boolean isEquivalent(DataType dt) {
+	protected boolean isEquivalent(DataType dt, DataTypeConflictHandler handler) {
 		if (dt == this) {
 			return true;
 		}
 		if (!(dt instanceof Array)) {
 			return false;
 		}
+
 		Array array = (Array) dt;
 		if (getNumElements() != array.getNumElements()) {
 			return false;
 		}
+
 		DataType dataType = getDataType();
-		if (!dataType.isEquivalent(array.getDataType())) {
+		DataType otherDataType = array.getDataType();
+
+		// if they contain datatypes that have same ids, then we are essentially equivalent.
+		if (DataTypeUtilities.isSameDataType(dataType, otherDataType)) {
+			return true;
+		}
+
+		if (handler != null) {
+			handler = handler.getSubsequentHandler();
+		}
+		if (!DataTypeDB.isEquivalent(dataType, otherDataType, handler)) {
 			return false;
 		}
+
 		if (dataType instanceof Dynamic && getElementLength() != array.getElementLength()) {
 			return false;
 		}
 		return true;
 	}
 
+	@Override
+	public boolean isEquivalent(DataType dt) {
+		return isEquivalent(dt, null);
+	}
+
 	@Override
 	public void dataTypeReplaced(DataType oldDt, DataType newDt) {
 		lock.acquire();
@@ -255,13 +273,37 @@ class ArrayDB extends DataTypeDB implements Array {
 
 			if (oldDt == getDataType()) {
 
+				int oldElementLength = getElementLength();
+				int newElementLength =
+					elementLength = newDt.getLength() < 0 ? oldElementLength : -1;
+
+				// check for existing pointer to newDt
+				ArrayDataType newArray =
+					new ArrayDataType(newDt, getNumElements(), newElementLength, dataMgr);
+				DataType existingArray =
+					dataMgr.getDataType(newDt.getCategoryPath(), newArray.getName());
+				if (existingArray != null) {
+					// avoid duplicate array - replace this array with existing one
+					dataMgr.addDataTypeToReplace(this, existingArray);
+					return;
+				}
+
+				if (!newDt.getCategoryPath().equals(oldDt.getCategoryPath())) {
+					// move this pointer to same category as newDt
+					try {
+						super.setCategoryPath(newDt.getCategoryPath());
+					}
+					catch (DuplicateNameException e) {
+						throw new RuntimeException(e); // already checked
+					}
+				}
+
 				oldDt.removeParent(this);
 				newDt.addParent(this);
 
 				String myOldName = getOldName();
 				int oldLength = getLength();
 				int oldAlignment = getAlignment();
-				int oldElementLength = getElementLength();
 
 				record.setLongValue(ArrayDBAdapter.ARRAY_DT_ID_COL, dataMgr.getResolvedID(newDt));
 				if (newDt instanceof Dynamic || newDt instanceof FactoryDataType) {
@@ -276,7 +318,7 @@ class ArrayDB extends DataTypeDB implements Array {
 					dataMgr.dbError(e);
 				}
 				refreshName();
-				if (!getName().equals(myOldName)) {
+				if (!oldDt.getName().equals(newDt.getName())) {
 					notifyNameChanged(myOldName);
 				}
 				if (getLength() != oldLength || oldElementLength != getElementLength()) {

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

@@ -46,8 +46,7 @@ abstract class ArrayDBAdapter {
 	 * @throws CancelledException task cancelled
 	 */
 	static ArrayDBAdapter getAdapter(DBHandle handle, int openMode, String tablePrefix,
-			TaskMonitor monitor)
+			TaskMonitor monitor) throws VersionException, IOException, CancelledException {
-			throws VersionException, IOException, CancelledException {
 		if (openMode == DBConstants.CREATE) {
 			return new ArrayDBAdapterV1(handle, tablePrefix, true);
 		}
@@ -71,8 +70,8 @@ abstract class ArrayDBAdapter {
 	}
 
 	private static ArrayDBAdapter upgrade(DBHandle handle, ArrayDBAdapter oldAdapter,
-			String tablePrefix,
+			String tablePrefix, TaskMonitor monitor)
-			TaskMonitor monitor) throws VersionException, IOException, CancelledException {
+			throws VersionException, IOException, CancelledException {
 
 		DBHandle tmpHandle = new DBHandle();
 		long id = tmpHandle.startTransaction();
@@ -116,4 +115,10 @@ abstract class ArrayDBAdapter {
 
 	abstract Field[] getRecordIdsInCategory(long categoryID) throws IOException;
 
+	/**
+	 * Get the number of array datatype records
+	 * @return total number of composite records
+	 */
+	public abstract int getRecordCount();
+
 }

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/data/ArrayDBAdapterV0.java

@@ -91,7 +91,8 @@ class ArrayDBAdapterV0 extends ArrayDBAdapter {
 		DBRecord rec = ArrayDBAdapter.SCHEMA.createRecord(oldRec.getKey());
 		rec.setLongValue(ArrayDBAdapter.ARRAY_DT_ID_COL, oldRec.getLongValue(V0_ARRAY_DT_ID_COL));
 		rec.setIntValue(ArrayDBAdapter.ARRAY_DIM_COL, oldRec.getIntValue(V0_ARRAY_DIM_COL));
-		rec.setIntValue(ArrayDBAdapter.ARRAY_ELEMENT_LENGTH_COL, oldRec.getIntValue(V0_ARRAY_ELEMENT_LENGTH_COL));
+		rec.setIntValue(ArrayDBAdapter.ARRAY_ELEMENT_LENGTH_COL,
+			oldRec.getIntValue(V0_ARRAY_ELEMENT_LENGTH_COL));
 		rec.setLongValue(ArrayDBAdapter.ARRAY_CAT_COL, 0);
 		return rec;
 	}
@@ -141,4 +142,9 @@ class ArrayDBAdapterV0 extends ArrayDBAdapter {
 		return Field.EMPTY_ARRAY;
 	}
 
+	@Override
+	public int getRecordCount() {
+		return table.getRecordCount();
+	}
+
 }

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/data/ArrayDBAdapterV1.java

@@ -118,4 +118,8 @@ class ArrayDBAdapterV1 extends ArrayDBAdapter {
 		return table.findRecords(new LongField(categoryID), V1_ARRAY_CAT_COL);
 	}
 
+	@Override
+	public int getRecordCount() {
+		return table.getRecordCount();
+	}
 }

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

@@ -52,7 +52,8 @@ public abstract class BuiltinDBAdapter {
 	 * @return new record
 	 * @throws IOException if there was a problem accessing the database
 	 */
-	abstract DBRecord createRecord(String name, String className, long categoryID) throws IOException;
+	abstract DBRecord createRecord(String name, String className, long categoryID)
+			throws IOException;
 
 	/**
 	 * Gets the Built-in data type record with the indicated ID.
@@ -92,4 +93,10 @@ public abstract class BuiltinDBAdapter {
 	 * @throws IOException if IO error occurs
 	 */
 	abstract RecordIterator getRecords() throws IOException;
+
+	/**
+	 * Get the number of built-in datatype records
+	 * @return total number of composite records
+	 */
+	public abstract int getRecordCount();
 }

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/data/BuiltinDBAdapterV0.java

@@ -52,8 +52,7 @@ class BuiltinDBAdapterV0 extends BuiltinDBAdapter {
 
 		String tableName = tablePrefix + BUILT_IN_TABLE_NAME;
 		if (create) {
-			table = handle.createTable(tableName, V0_SCHEMA,
+			table = handle.createTable(tableName, V0_SCHEMA, new int[] { V0_BUILT_IN_CAT_COL });
-				new int[] { V0_BUILT_IN_CAT_COL });
 		}
 		else {
 			table = handle.getTable(tableName);
@@ -87,7 +86,8 @@ class BuiltinDBAdapterV0 extends BuiltinDBAdapter {
 	}
 
 	@Override
-	public DBRecord createRecord(String name, String className, long categoryID) throws IOException {
+	public DBRecord createRecord(String name, String className, long categoryID)
+			throws IOException {
 
 		long tableKey = table.getKey();
 		if (tableKey <= 100) {
@@ -108,4 +108,9 @@ class BuiltinDBAdapterV0 extends BuiltinDBAdapter {
 		return table.iterator();
 	}
 
+	@Override
+	public int getRecordCount() {
+		return table.getRecordCount();
+	}
+
 }

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

@@ -49,8 +49,7 @@ abstract class CompositeDBAdapter implements DBRecordAdapter {
 		CompositeDBAdapterV5V6.V5V6_COMPOSITE_SOURCE_SYNC_TIME_COL;
 	static final int COMPOSITE_LAST_CHANGE_TIME_COL =
 		CompositeDBAdapterV5V6.V5V6_COMPOSITE_LAST_CHANGE_TIME_COL;
-	static final int COMPOSITE_PACKING_COL =
+	static final int COMPOSITE_PACKING_COL = CompositeDBAdapterV5V6.V5V6_COMPOSITE_PACK_COL;
-		CompositeDBAdapterV5V6.V5V6_COMPOSITE_PACK_COL;
 	static final int COMPOSITE_MIN_ALIGN_COL = CompositeDBAdapterV5V6.V5V6_COMPOSITE_MIN_ALIGN_COL;
 
 	// Stored Packing and Minimum Alignment values are consistent with CompositeInternal
@@ -217,6 +216,7 @@ abstract class CompositeDBAdapter implements DBRecordAdapter {
 	 * @return the composite data type record iterator.
 	 * @throws IOException if the database can't be accessed.
 	 */
+	@Override
 	public abstract RecordIterator getRecords() throws IOException;
 
 	/**
@@ -272,9 +272,10 @@ abstract class CompositeDBAdapter implements DBRecordAdapter {
 			throws IOException;
 
 	/**
-	 * Get the number of composite records
+	 * Get the number of composite datatype records
 	 * @return total number of composite records
 	 */
+	@Override
 	public abstract int getRecordCount();
 
 }

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

@@ -295,8 +295,15 @@ class DataTypeComponentDB implements InternalDataTypeComponent {
 		return myDt.getClass() == otherDt.getClass();
 	}
 
-	@Override
+	static boolean isEquivalent(DataTypeComponent existingDtc, DataTypeComponent dtc,
-	public boolean isEquivalent(DataTypeComponent dtc) {
+			DataTypeConflictHandler handler) {
+		if (existingDtc instanceof DataTypeComponentDB existingDtcDB) {
+			return existingDtcDB.isEquivalent(dtc, handler);
+		}
+		return existingDtc.isEquivalent(dtc);
+	}
+
+	boolean isEquivalent(DataTypeComponent dtc, DataTypeConflictHandler handler) {
 		DataType myDt = getDataType();
 		DataType otherDt = dtc.getDataType();
 		// SCR #11220 - this may fix the null pointer exception  - not sure as it is hard
@@ -319,7 +326,16 @@ class DataTypeComponentDB implements InternalDataTypeComponent {
 			return false;
 		}
 
-		return DataTypeUtilities.isSameOrEquivalentDataType(myDt, otherDt);
+		if (DataTypeUtilities.isSameDataType(myDt, otherDt)) {
+			return true;
+		}
+
+		return DataTypeDB.isEquivalent(myDt, otherDt, handler);
+	}
+
+	@Override
+	public boolean isEquivalent(DataTypeComponent dtc) {
+		return isEquivalent(dtc, null);
 	}
 
 	@Override
@@ -413,8 +429,7 @@ class DataTypeComponentDB implements InternalDataTypeComponent {
 			// TODO: Need to check field name and throw DuplicateNameException
 			// name = checkFieldName(name);
 			record.setString(ComponentDBAdapter.COMPONENT_FIELD_NAME_COL, name);
-			record.setLongValue(ComponentDBAdapter.COMPONENT_DT_ID_COL,
+			record.setLongValue(ComponentDBAdapter.COMPONENT_DT_ID_COL, dataMgr.getResolvedID(dt));
-				dataMgr.getResolvedID(dt));
 			record.setString(ComponentDBAdapter.COMPONENT_COMMENT_COL, comment);
 			updateRecord(false);
 		}

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

@@ -585,4 +585,33 @@ abstract class DataTypeDB extends DatabaseObject implements DataType {
 		throw new DataTypeEncodeException("Encoding not supported", repr, this);
 	}
 
+	/**
+	 * Perform equivalence check while resolving the specified dataType.  If the specified conflict 
+	 * handler under a conflict situation indicates that the existing data type (i.e., this type)
+	 * be used in place of the specified dataType this method will return true.
+	 * @param dataType datatype being resolved
+	 * @param handler resolve conflict handler (if null perform normal {@link #isEquivalent(DataType)}
+	 * @return true if the specified dataType should be considered equivalent to this datatype.
+	 */
+	protected abstract boolean isEquivalent(DataType dataType, DataTypeConflictHandler handler);
+
+	/**
+	 * If possible, perform equivalence check while resolving the specified dataType if the 
+	 * existingDataType is an instance of DataTypeDB.  Otherwise, perform a normal 
+	 * isEquivalent operation.  If the specified conflict 
+	 * handler under a conflict situation indicates that the existing data type (i.e., this type)
+	 * be used in place of the specified dataType this method will return true.
+	 * @param existingDataType existing datatype
+	 * @param otherDataType datatype being resolved
+	 * @param handler resolve conflict handler (if null perform normal {@link #isEquivalent(DataType)}
+	 * @return true if the specified dataType should be considered equivalent to this datatype.
+	 */
+	static boolean isEquivalent(DataType existingDataType, DataType otherDataType,
+			DataTypeConflictHandler handler) {
+		if (existingDataType instanceof DataTypeDB existingDataTypeDB) {
+			return existingDataTypeDB.isEquivalent(otherDataType, handler);
+		}
+		return existingDataType.isEquivalent(otherDataType);
+	}
+
 }

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

@@ -28,6 +28,7 @@ import javax.help.UnsupportedOperationException;
 import db.*;
 import db.util.ErrorHandler;
 import generic.jar.ResourceFile;
+import generic.stl.Pair;
 import ghidra.app.plugin.core.datamgr.archive.BuiltInSourceArchive;
 import ghidra.docking.settings.*;
 import ghidra.framework.Application;
@@ -145,19 +146,21 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 	private List<InvalidatedListener> invalidatedListeners = new ArrayList<>();
 	protected DataTypeManagerChangeListenerHandler defaultListener =
 		new DataTypeManagerChangeListenerHandler();
-	private NameComparator nameComparator = new NameComparator();
+	private Comparator<DataType> nameComparator = DataTypeComparator.INSTANCE;
 	private int creatingDataType = 0;
 	protected UniversalID universalID;
 
 	private Map<UniversalID, SourceArchive> sourceArchiveMap;
 	private LinkedList<Long> idsToDelete = new LinkedList<>();
+	private LinkedList<Pair<DataType, DataType>> typesToReplace = new LinkedList<>();
 	private List<DataType> favoritesList = new ArrayList<>();
 	private IdsToDataTypeMap idsToDataTypeMap = new IdsToDataTypeMap();
 
 	private ThreadLocal<EquivalenceCache> equivalenceCache = new ThreadLocal<>();
 
 	private IdentityHashMap<DataType, DataType> resolveCache;
-	private TreeSet<ResolvePair> resolveQueue;
+	private TreeSet<ResolvePair> resolveQueue; // TODO: is TreeSet really needed?
+	private LinkedList<DataType> conflictQueue = new LinkedList<>();
 
 	private boolean isBulkRemoving;
 
@@ -971,14 +974,10 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 		if (sortedDataTypes == null) {
 			return;
 		}
+		// find and remove exact match from sortedDataTypes list
 		String name = dataTypePath.getDataTypeName();
-		DataType compareDataType = new TypedefDataType(name, DataType.DEFAULT);
+		DataType compareDataType =
-		try {
+			new TypedefDataType(dataTypePath.getCategoryPath(), name, DataType.DEFAULT, this);
-			compareDataType.setCategoryPath(dataTypePath.getCategoryPath());
-		}
-		catch (DuplicateNameException e) {
-			// will not happen - compareDataType not in dataTypeManager
-		}
 		int index = Collections.binarySearch(sortedDataTypes, compareDataType, nameComparator);
 		if (index >= 0) {
 			sortedDataTypes.remove(index);
@@ -995,6 +994,7 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 			sortedDataTypes.add(index, dataType);
 		}
 		else {
+			// NOTE: ideally, this should never happen and may indicate presence of duplicate
 			sortedDataTypes.set(index, dataType);
 		}
 	}
@@ -1236,40 +1236,37 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 			}
 
 			resolvedDataType = getCachedResolve(dataType);
-			if (resolvedDataType != null) {
+			if (resolvedDataType == null) {
-				return resolvedDataType;
+				SourceArchive sourceArchive = dataType.getSourceArchive();
+				if (sourceArchive != null &&
+					sourceArchive.getArchiveType() == ArchiveType.BUILT_IN) {
+					resolvedDataType = resolveBuiltIn(dataType);
+				}
+				else if (sourceArchive == null || dataType.getUniversalID() == null) {
+					// if the dataType has no source or it has no ID (datatypes with no ID are
+					// always local i.e. pointers)
+					resolvedDataType = resolveDataTypeNoSource(dataType);
+				}
+				else if (!sourceArchive.getSourceArchiveID().equals(getUniversalID()) &&
+					sourceArchive.getArchiveType() == ArchiveType.PROGRAM) {
+					// dataTypes from a different program don't carry over their identity.
+					resolvedDataType = resolveDataTypeNoSource(dataType);
+				}
+				else {
+					resolvedDataType = resolveDataTypeWithSource(dataType);
+				}
+				cacheResolvedDataType(dataType, resolvedDataType);
+				if (resolvedDataType instanceof DataTypeDB) {
+					setCachedEquivalence((DataTypeDB) resolvedDataType, dataType);
+				}
 			}
-
-			// TODO: delayed pointer-resolve use of "undefined *" could cause unintended
-			// equivalence match.  May need to use an internal reserved type instead. 
-
-			SourceArchive sourceArchive = dataType.getSourceArchive();
-			if (sourceArchive != null && sourceArchive.getArchiveType() == ArchiveType.BUILT_IN) {
-				resolvedDataType = resolveBuiltIn(dataType, currentHandler);
-			}
-			else if (sourceArchive == null || dataType.getUniversalID() == null) {
-				// if the dataType has no source or it has no ID (datatypes with no ID are
-				// always local i.e. pointers)
-				resolvedDataType = resolveDataTypeNoSource(dataType, currentHandler);
-			}
-			else if (!sourceArchive.getSourceArchiveID().equals(getUniversalID()) &&
-				sourceArchive.getArchiveType() == ArchiveType.PROGRAM) {
-				// dataTypes from a different program don't carry over their identity.
-				resolvedDataType = resolveDataTypeNoSource(dataType, currentHandler);
-			}
-			else {
-				resolvedDataType = resolveDataTypeWithSource(dataType, currentHandler);
-			}
-			cacheResolvedDataType(dataType, resolvedDataType);
-			if (resolvedDataType instanceof DataTypeDB) {
-				setCachedEquivalence((DataTypeDB) resolvedDataType, dataType);
-			}
-			return resolvedDataType;
 		}
 		finally {
 			try {
 				if (isResolveCacheOwner) {
-					flushResolveQueue(true); // may throw exception - incomplete resolve
+					// Process resolve queue and allowed resolvedDataType to be replaced
+					// during conflict processing
+					resolvedDataType = processResolveQueue(true, resolvedDataType);
 				}
 			}
 			finally {
@@ -1280,13 +1277,14 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 				lock.release();
 			}
 		}
+		return resolvedDataType;
 	}
 
-	private DataType resolveBuiltIn(DataType dataType, DataTypeConflictHandler handler) {
+	private DataType resolveBuiltIn(DataType dataType) {
 
 		if (dataType instanceof Pointer) {
 			// treat built-in pointers like other datatypes without a source
-			return resolveDataTypeNoSource(dataType, currentHandler);
+			return resolveDataTypeNoSource(dataType);
 		}
 
 		// can't do this check now because Pointers from the BuiltinDataTypeManager are
@@ -1309,7 +1307,8 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 					"Failed to rename conflicting datatype: " + existingDataType.getPathName(), e);
 			}
 		}
-		return createDataType(dataType, dataType.getName(), BuiltInSourceArchive.INSTANCE, handler);
+		return createDataType(dataType, dataType.getName(), BuiltInSourceArchive.INSTANCE,
+			currentHandler);
 	}
 
 	private DataType resolveBitFieldDataType(BitFieldDataType bitFieldDataType,
@@ -1394,12 +1393,14 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 				if (!(dataType instanceof Enum)) {
 					return false;
 				}
+				// TODO: implement doReplaceWith
 				existingDataType.replaceWith(dataType);
 			}
 			else if (existingDataType instanceof TypedefDB) {
 				if (!(dataType instanceof TypeDef)) {
 					return false;
 				}
+				// TODO: implement doReplaceWith
 				existingDataType.replaceWith(dataType);
 			}
 			else {
@@ -1480,8 +1481,6 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 			return category.getDataTypesByBaseName(dataType.getName());
 		}
 
-		// Handle pointers and arrays
-
 		DataType existingDataType = category.getDataType(dataType.getName());
 
 		DataType baseDataType = DataTypeUtilities.getBaseDataType(dataType);
@@ -1523,13 +1522,15 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 		// If the existing Data type is currently being resolved, its isEquivalent
 		// method is short circuited such that it will return true. So it is important 
 		// to call the isEquivalent on the existing datatype and not the dataType.
-		if (existingDataType != null && existingDataType.isEquivalent(dataType)) {
+		if (existingDataType != null &&
+			DataTypeDB.isEquivalent(existingDataType, dataType, currentHandler)) {
 			return existingDataType;
 		}
 
 		List<DataType> relatedByName = findDataTypesSameLocation(dataType);
 		for (DataType candidate : relatedByName) {
-			if (candidate != existingDataType && candidate.isEquivalent(dataType)) {
+			if (candidate != existingDataType &&
+				DataTypeDB.isEquivalent(candidate, dataType, currentHandler)) {
 				return candidate;
 			}
 		}
@@ -1571,18 +1572,16 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 	 * 
 	 * @param dataType the dataType for which to return an equivalent dataType in
 	 *                 this manager
-	 * @param handler  Used to handle collisions with dataTypes with same path and
-	 *                 name that is
 	 * @return resolved datatype
 	 */
-	private DataType resolveDataTypeNoSource(DataType dataType, DataTypeConflictHandler handler) {
+	private DataType resolveDataTypeNoSource(DataType dataType) {
 
 		DataType existingDataType = findEquivalentDataTypeSameLocation(dataType);
 		if (existingDataType != null) {
 			return existingDataType;
 		}
 
-		return resolveNoEquivalentFound(dataType, null, handler);
+		return resolveNoEquivalentFound(dataType, null);
 	}
 
 	/**
@@ -1591,19 +1590,17 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 	 * 
 	 * @param dataType the dataType for which to return an equivalent dataType in
 	 *                 this manager
-	 * @param handler  Used to handle collisions with dataTypes with same path and
-	 *                 name that is
 	 * @return resolved datatype
 	 */
-	private DataType resolveDataTypeWithSource(DataType dataType, DataTypeConflictHandler handler) {
+	private DataType resolveDataTypeWithSource(DataType dataType) {
 
 		SourceArchive sourceArchive = dataType.getSourceArchive();
 
 		// Do we have that dataType already resolved and associated with the source archive?
 		DataType existingDataType = getDataType(sourceArchive, dataType.getUniversalID());
 		if (existingDataType != null) {
-			if (!existingDataType.isEquivalent(dataType) &&
+			if (!DataTypeDB.isEquivalent(existingDataType, dataType, currentHandler) &&
-				handler.shouldUpdate(dataType, existingDataType)) {
+				currentHandler.shouldUpdate(dataType, existingDataType)) {
 				existingDataType.replaceWith(dataType);
 				existingDataType.setLastChangeTime(dataType.getLastChangeTime());
 			}
@@ -1614,9 +1611,9 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 			// Avoid conflict handling for types with a source which matches
 			// this archive, although a conflict name may still be used.  
 			// This can occur when a semi-mirrored archive instance is used
-			// such as the CompositeViewerDataTypeManager which uses the same 
+			// such as the CompositeViewerDataTypeManager or Program Merge 
-			// Archive UniversalID as the edited datatype's source.
+			// which uses the same Archive UniversalID.
-			return createDataType(dataType, sourceArchive, handler);
+			return createConflictDataType(dataType, sourceArchive);
 		}
 
 		// If we have the same path name and the existing data type is a local data type
@@ -1630,7 +1627,7 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 			return existingDataType;
 		}
 
-		return resolveNoEquivalentFound(dataType, sourceArchive, handler);
+		return resolveNoEquivalentFound(dataType, sourceArchive);
 	}
 
 	/**
@@ -1639,11 +1636,9 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 	 * using the specified conflict handler.
 	 * @param dataType datatype being resolved
 	 * @param sourceArchive source archive associated with new type (may be null)
-	 * @param handler datatype conflict handler
 	 * @return resolved datatype (may be existing or newly added datatype)
 	 */
-	private DataType resolveNoEquivalentFound(DataType dataType, SourceArchive sourceArchive,
+	private DataType resolveNoEquivalentFound(DataType dataType, SourceArchive sourceArchive) {
-			DataTypeConflictHandler handler) {
 
 		if (sourceArchive != null && sourceArchive.getArchiveType() == ArchiveType.PROGRAM) {
 			sourceArchive = null; // do not preserve program as a source archive
@@ -1653,13 +1648,14 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 		// (preference is given to similar kind of datatype when checking existing conflict types)
 		DataType existingDataType = findDataTypeSameLocation(dataType);
 		if (existingDataType == null) {
-			return createDataType(dataType, sourceArchive, handler);
+			return createDataType(dataType, getUnusedConflictName(dataType), sourceArchive,
+				currentHandler);
 		}
 
 		// So we have a dataType with the same path and name, but not equivalent, so use
 		// the conflictHandler to decide what to do.
-		ConflictResult result = handler.resolveConflict(dataType, existingDataType);
+		ConflictResult conflictResult = currentHandler.resolveConflict(dataType, existingDataType);
-		switch (result) {
+		switch (conflictResult) {
 
 			case REPLACE_EXISTING: // new type replaces old conflicted type
 				try {
@@ -1668,7 +1664,7 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 					}
 					renameToUnusedConflictName(existingDataType);
 					DataType newDataType =
-						createDataType(dataType, dataType.getName(), sourceArchive, handler);
+						createDataType(dataType, dataType.getName(), sourceArchive, currentHandler);
 					try {
 						replace(existingDataType, newDataType);
 					}
@@ -1684,25 +1680,22 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 				}
 
 			case RENAME_AND_ADD: // default handler behavior
-				return createDataType(dataType, sourceArchive, handler);
+				return createConflictDataType(dataType, sourceArchive);
 
 			default:  // USE_EXISTING - new type is discarded and old conflicted type is returned
 				return existingDataType;
 		}
 	}
 
-	private DataType createDataType(DataType dataType, SourceArchive sourceArchive,
+	private DataType createConflictDataType(DataType dataType, SourceArchive sourceArchive) {
-			DataTypeConflictHandler handler) {
 		String dtName = getUnusedConflictName(dataType);
-		DataType newDataType = createDataType(dataType, dtName, sourceArchive, handler);
+		DataType newDataType = createDataType(dataType, dtName, sourceArchive, currentHandler);
 
-		// resolving child data types could result in another copy of dataType in the
+		// NOTE: queue conflict datatype for delayed check for equivalent type.
-		// manager depending upon the conflict handler - check again
+		// This is not needed for Pointer or Array which will update if/when
-		DataType existingDataType = findEquivalentDataTypeSameLocation(dataType);
+		// referenced type gets replaced.
-		// If there is an equivalent datatype, remove the added type and return the existing
+		if (!(newDataType instanceof Pointer) && !(newDataType instanceof Array)) {
-		if (existingDataType != null && existingDataType != newDataType) {
+			conflictQueue.add(newDataType);
-			removeInternal(newDataType, TaskMonitor.DUMMY);
-			return existingDataType;
 		}
 		return newDataType;
 	}
@@ -1748,14 +1741,14 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 				monitor.checkCancelled();
 				resolve(dt, handler);
 				if (isResolveCacheOwner) {
-					flushResolveQueue(false);
+					processResolveQueue(false);
 				}
 				monitor.setProgress(++i);
 			}
 		}
 		finally {
 			if (isResolveCacheOwner) {
-				flushResolveQueue(true);
+				processResolveQueue(true);
 			}
 			if (isEquivalenceCacheOwner) {
 				clearEquivalenceCache();
@@ -1865,6 +1858,7 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 			}
 
 			replace(existingDt, replacementDt);
+
 			if (fixupName) {
 				try {
 					long lastChangeTime = replacementDt.getLastChangeTime();
@@ -1897,22 +1891,44 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 
 	private void replace(DataType existingDt, DataType replacementDt)
 			throws DataTypeDependencyException {
-		if (existingDt == replacementDt) {
+
+		if (!contains(existingDt)) {
 			return;
 		}
 
-		DataTypePath replacedDtPath = existingDt.getDataTypePath();
-		long replacedId = getID(existingDt);
-
-		UniversalID id = existingDt.getUniversalID();
-		idsToDataTypeMap.removeDataType(existingDt.getSourceArchive(), id);
-
 		if (replacementDt.dependsOn(existingDt)) {
 			throw new DataTypeDependencyException("Replace failed: " +
 				replacementDt.getDisplayName() + " depends on " + existingDt.getDisplayName());
 		}
 
-		replaceUsesInOtherDataTypes(existingDt, replacementDt);
+		addDataTypeToReplace(existingDt, replacementDt);
+		replaceQueuedDataTypes();
+	}
+
+	private void replaceQueuedDataTypes() {
+
+		// collect all datatypes to be replaced and notify children which may also get queued
+		// for removal.
+		LinkedList<Pair<DataType, DataType>> dataTypeReplacements = new LinkedList<>();
+		while (!typesToReplace.isEmpty()) {
+			Pair<DataType, DataType> dataTypeReplacement = typesToReplace.removeFirst();
+			replaceUsesInOtherDataTypes(dataTypeReplacement.first, dataTypeReplacement.second);
+			dataTypeReplacements.addFirst(dataTypeReplacement);
+		}
+
+		// perform actual database updates (e.g., record updates, change notifications, etc.)
+		for (Pair<DataType, DataType> dataTypeReplacement : dataTypeReplacements) {
+			replaceDataType(dataTypeReplacement.first, dataTypeReplacement.second);
+		}
+	}
+
+	private void replaceDataType(DataType existingDt, DataType replacementDt) {
+
+		DataTypePath replacedDtPath = existingDt.getDataTypePath();
+		long replacedId = getID(existingDt);
+
+		UniversalID id = existingDt.getUniversalID();
+		idsToDataTypeMap.removeDataType(existingDt.getSourceArchive(), id);
 
 		try {
 			replaceDataTypeIDs(replacedId, getID(replacementDt));
@@ -1929,13 +1945,20 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 
 	private void replaceUsesInOtherDataTypes(DataType existingDt, DataType newDt) {
 		if (existingDt instanceof DataTypeDB) {
+			// Notify parents that a dependency has been replaced.  For pointers and arrays
+			// it may require their subsequent category change or removal to avoid duplication.
 			for (DataType dt : existingDt.getParents()) {
 				dt.dataTypeReplaced(existingDt, newDt);
 			}
 		}
 		else {
+			// Since we do not track parents of non-DB types we must assume that all data types
+			// must be modified.  Use of the sortedDataTypes list is the simplest way to do this. 
+			// A copy of the list must be used since it will changed if other types get removed
+			// in the process.
 			buildSortedDataTypeList();
-			for (DataType dt : new ArrayList<>(sortedDataTypes)) {
+			List<DataType> sortedDataTypesCopy = new ArrayList<>(sortedDataTypes);
+			for (DataType dt : sortedDataTypesCopy) {
 				dt.dataTypeReplaced(existingDt, newDt);
 			}
 		}
@@ -2008,17 +2031,23 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 			list.add(DataType.DEFAULT);
 			return;
 		}
+		// ignore .conflict in both name and result matches
 		lock.acquire();
 		try {
 			buildSortedDataTypeList();
-			DataType compareDataType = new TypedefDataType(name, DataType.DEFAULT);
+			// Use exemplar datatype in root category without .conflict to position at start
+			// of possible matches
+			name = DataTypeUtilities.getNameWithoutConflict(name);
+			DataType compareDataType =
+				new TypedefDataType(CategoryPath.ROOT, name, DataType.DEFAULT, this);
 			int index = Collections.binarySearch(sortedDataTypes, compareDataType, nameComparator);
 			if (index < 0) {
 				index = -index - 1;
 			}
+			// add all matches to list
 			while (index < sortedDataTypes.size()) {
 				DataType dt = sortedDataTypes.get(index);
-				if (!name.equals(dt.getName())) {
+				if (!name.equals(DataTypeUtilities.getNameWithoutConflict(dt, false))) {
 					break;
 				}
 				list.add(dt);
@@ -2206,43 +2235,38 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 	 * Remove the given datatype from this manager (assumes the lock has already been acquired).
 	 * 
 	 * @param dataType the dataType to be removed
-	 * @param monitor  the task monitor
 	 */
-	private boolean removeInternal(DataType dataType, TaskMonitor monitor) {
+	private void removeInternal(DataType dataType) {
 		if (!contains(dataType)) {
-			return false;
+			return;
 		}
 
-		LinkedList<Long> deletedIds = new LinkedList<>();
-
 		long id = getID(dataType);
-
 		if (id < 0) {
-			return false;
+			return;
 		}
-
 		idsToDelete.add(Long.valueOf(id));
+		removeQueuedDataTypes();
+	}
 
+	private void removeQueuedDataTypes() {
+
+		// collect all datatype to be removed and notify children which may also get queued
+		// for removal.
+		LinkedList<Long> deletedIds = new LinkedList<>();
 		while (!idsToDelete.isEmpty()) {
-			Long l = idsToDelete.removeFirst();
+			long id = idsToDelete.removeFirst();
-			id = l.longValue();
 			removeUseOfDataType(id);
-
+			deletedIds.addFirst(id);
-			deletedIds.addFirst(l);
 		}
 
-		for (Long l : deletedIds) {
+		// perform actual database updates (e.g., record removal, change notifications, etc.)
-			deleteDataType(l.longValue());
+		for (long id : deletedIds) {
+			deleteDataType(id);
 		}
 
-		try {
+		// Remove all uses of datatypes external to datatype manager
-			deleteDataTypeIDs(deletedIds, monitor);
+		deleteDataTypeIDs(deletedIds);
-		}
-		catch (CancelledException e) {
-			return false;
-		}
-
-		return true;
 	}
 
 	private void removeUseOfDataType(long id) {
@@ -2267,11 +2291,15 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 	public boolean remove(DataType dataType, TaskMonitor monitor) {
 		lock.acquire();
 		try {
-			return removeInternal(dataType, monitor);
+			if (contains(dataType)) {
+				removeInternal(dataType);
+				return true;
+			}
 		}
 		finally {
 			lock.release();
 		}
+		return false;
 	}
 
 	@Override
@@ -2358,18 +2386,29 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 		return (sourceArchive.equals(dtm.getLocalSourceArchive()));
 	}
 
+	/**
+	 * Queue a datatype to deleted in response to another datatype being deleted.
+	 * @param id datatype ID to be removed
+	 */
 	protected void addDataTypeToDelete(long id) {
 		idsToDelete.add(Long.valueOf(id));
 	}
 
+	/**
+	 * Queue a datatype to be replaced by another datatype in response to its referenced 
+	 * datatype being replaced.
+	 * @param oldDataType datatype to be replaced
+	 * @param replacementDataType datatype which is the replacement
+	 */
+	protected void addDataTypeToReplace(DataType oldDataType, DataType replacementDataType) {
+		typesToReplace.add(new Pair<>(oldDataType, replacementDataType));
+	}
+
 	/**
 	 * Delete all datatype uses external to the datatype manager if applicable.
 	 * @param deletedIds old datatype IDs which were deleted
-	 * @param monitor task monitor
-	 * @throws CancelledException if operation cancelled
 	 */
-	abstract protected void deleteDataTypeIDs(LinkedList<Long> deletedIds, TaskMonitor monitor)
+	abstract protected void deleteDataTypeIDs(LinkedList<Long> deletedIds);
-			throws CancelledException;
 
 	private void notifyDeleted(long dataTypeID) {
 		DataType dataType = getDataType(dataTypeID);
@@ -2377,9 +2416,16 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 			return;
 		}
 		if (dataType instanceof DataTypeDB dt) {
+			// Notify datatype that it has been deleted which in-turn will notify all of its
+			// parents.  Parent datatype which are no longer valid (i.e., pointers, arrays)
+			// may invoke addDataTypeToDelete method to schedule their subsequent removal.
 			dt.notifyDeleted();
 		}
 		else {
+			// Since we do not track parents of non-DB types we must assume that all data types
+			// must be modified.  Use of the sortedDataTypes list is the simplest way to do this. 
+			// A copy of the list must be used since it will changed if other types get removed
+			// in the process.
 			buildSortedDataTypeList();
 			List<DataType> sortedDataTypesCopy = new ArrayList<>(sortedDataTypes);
 			for (DataType dt : sortedDataTypesCopy) {
@@ -3036,6 +3082,7 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 		if (name == null || name.length() == 0) {
 			throw new IllegalArgumentException("Data type must have a valid name");
 		}
+
 		DataType dataType = resolve(typedef.getDataType(), getDependencyConflictHandler());
 		boolean isAutoNamed = typedef.isAutoNamed();
 		short flags = 0;
@@ -3386,30 +3433,6 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 		}
 	}
 
-	private class NameComparator implements Comparator<DataType> {
-		/**
-		 * Compares its two arguments for order. Returns a negative integer, zero, or a
-		 * positive integer as the first argument is less than, equal to, or greater
-		 * than the second.
-		 * <p>
-		 *
-		 * @param d1 the first datatype to be compared
-		 * @param d2 the second datatype to be compared
-		 * @return a negative integer, zero, or a positive integer as the first argument
-		 *         is less than, equal to, or greater than the second
-		 * @throws ClassCastException if the arguments' types prevent them from being
-		 *                            compared by this Comparator
-		 */
-		@Override
-		public int compare(DataType d1, DataType d2) {
-			int c = d1.getName().compareTo(d2.getName());
-			if (c == 0) {
-				return d1.getCategoryPath().compareTo(d2.getCategoryPath());
-			}
-			return c;
-		}
-	}
-
 	/**
 	 * Handles IOExceptions
 	 * 
@@ -4325,10 +4348,208 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 		return GraphAlgorithms.getVerticesInPostOrder(graph, GraphNavigator.topDownNavigator());
 	}
 
+	/**
+	 * De-duplicate equivalent conflict datatypes which share a common base data type name and
+	 * are found to be equivalent.
+	 * 
+	 * @param dataType data type whose related conflict types should be de-duplicated
+	 * @return true if one or more datatypes were de-duplicted or dde-conflicted, else false
+	 */
+	public boolean dedupeConflicts(DataType dataType) {
+		if (!(dataType instanceof DataTypeDB)) {
+			return false;
+		}
+
+		lock.acquire();
+		try {
+			if (dataType instanceof Pointer || dataType instanceof Array) {
+				dataType = DataTypeUtilities.getBaseDataType(dataType);
+			}
+			if (!contains(dataType)) {
+				return false;
+			}
+			List<DataType> relatedByName = findDataTypesSameLocation(dataType);
+			if (relatedByName.size() < 2) {
+				return false;
+			}
+			Collections.sort(relatedByName, DataTypeComparator.INSTANCE);
+
+			boolean success = false;
+			for (int n = relatedByName.size() - 1; n != 0; n--) {
+				DataType targetDt = relatedByName.get(n);
+
+				for (int m = 0; m < n; m++) {
+					DataType candidate = relatedByName.get(m);
+					if (candidate.isEquivalent(targetDt)) {
+						try {
+							replace(targetDt, candidate);
+							success = true;
+							break;
+						}
+						catch (DataTypeDependencyException e) {
+							throw new AssertionError("Unexpected condition", e);
+						}
+					}
+				}
+			}
+			return success;
+		}
+		finally {
+			lock.release();
+		}
+	}
+
+	private record DedupedConflicts(int processCnt, int replaceCnt) {
+	}
+
+	private DedupedConflicts doDedupeConflicts(DataType dataType) {
+
+		List<DataType> relatedByName = findDataTypesSameLocation(dataType);
+		if (relatedByName.size() < 2) {
+			return new DedupedConflicts(1, 0);
+		}
+		Collections.sort(relatedByName, DataTypeComparator.INSTANCE);
+
+		int replaceCnt = 0;
+		for (int n = relatedByName.size() - 1; n != 0; n--) {
+			DataType targetDt = relatedByName.get(n);
+
+			for (int m = 0; m < n; m++) {
+				DataType candidate = relatedByName.get(m);
+				if (candidate.isEquivalent(targetDt)) {
+					try {
+						replace(targetDt, candidate);
+						++replaceCnt;
+						break;
+					}
+					catch (DataTypeDependencyException e) {
+						throw new AssertionError("Unexpected condition", e);
+					}
+				}
+			}
+		}
+		return new DedupedConflicts(relatedByName.size(), replaceCnt);
+
+	}
+
+	/**
+	 * De-duplicate equivalent conflict datatypes which share a common base data type name and
+	 * are found to be equivalent.
+	 * 
+	 * @param monitor task monitor
+	 * @throws CancelledException if task is cancelled
+	 */
+	public void dedupeAllConflicts(TaskMonitor monitor) throws CancelledException {
+		lock.acquire();
+		try {
+			List<DataType> conflictList = new ArrayList<>();
+			int total = popuplateConflictList(conflictList, getRootCategory());
+			monitor.initialize(total);
+			int processed = 0;
+			int replacements = 0;
+			for (DataType conflictDt : conflictList) {
+				monitor.checkCancelled();
+				DedupedConflicts result = doDedupeConflicts(conflictDt);
+				processed += result.processCnt;
+				replacements += result.replaceCnt;
+				monitor.setProgress(processed);
+			}
+			Msg.info(this, "Evaluated " + processed + " conflict types, replaced " + replacements +
+				" base type conflicts");
+		}
+		finally {
+			lock.release();
+		}
+	}
+
+	private int popuplateConflictList(List<DataType> conflictList, Category category) {
+
+		int count = 0;
+		for (Category childCategory : category.getCategories()) {
+			count += popuplateConflictList(conflictList, childCategory);
+		}
+
+		DataType[] dataTypes = category.getDataTypes();
+		Arrays.sort(dataTypes, DataTypeComparator.INSTANCE);
+
+		String lastBaseName = null;
+		boolean lastHadConflict = false;
+
+		for (DataType dt : dataTypes) {
+			if (dt instanceof Pointer || dt instanceof Array) {
+				continue;
+			}
+			boolean isConflict = dt.getName().contains(DataType.CONFLICT_SUFFIX);
+			String name = DataTypeUtilities.getNameWithoutConflict(dt, false);
+			if (!name.equals(lastBaseName)) {
+				// base name changed
+				lastBaseName = name;
+				lastHadConflict = false;
+				if (isConflict) {
+					// non-conflict type is not present
+					conflictList.add(dt);
+					lastHadConflict = true;
+					++count;
+				}
+			}
+			else if (isConflict) {
+				if (!lastHadConflict) {
+					// account for non-conflict type in count
+					conflictList.add(dt);
+					lastHadConflict = true;
+					++count;
+				}
+				++count;
+			}
+		}
+		return count;
+	}
+
+	/**
+	 * Process the conflict queue of newly created conflict datatypes.  Processing performs one
+	 * last attempt at locating an equivalent datatype 
+	 * 
+	 * @param dataType final resolved data type.
+	 * If a newly created conflict type and this method and is able to replace with an equivalent 
+	 * data type the replacement datatype will be returned, otherwise the specified {@code dataType}
+	 * instance will be returned.
+	 * @return final resolved data type
+	 */
+	private DataType processConflictQueue(DataType dataType) {
+
+		while (!conflictQueue.isEmpty()) {
+
+			// Process last conflict first (LIFO) to ensure conflicts with larger
+			// numbers are discarded first if applicable - although unlikely to occur
+			// during the same resolve-cycle.
+			DataType dt = conflictQueue.removeLast();
+
+			List<DataType> relatedByName = findDataTypesSameLocation(dt);
+			for (DataType candidate : relatedByName) {
+				if (candidate != dt && DataTypeDB.isEquivalent(candidate, dt,
+					DataTypeConflictHandler.DEFAULT_HANDLER)) {
+					try {
+						replace(dt, candidate);
+						if (dt == dataType) {
+							// switch final type
+							dataType = candidate;
+						}
+						break;
+					}
+					catch (DataTypeDependencyException e) {
+						// ignore - try next if available
+					}
+				}
+			}
+
+		}
+		return dataType;
+	}
+
 	/**
 	 * Activate resolveCache and associated resolveQueue if not already active. If
 	 * this method returns true caller is responsible for flushing resolveQueue and
-	 * invoking {@link #flushResolveQueue(boolean)} when resolve complete. 
+	 * invoking {@link #processResolveQueue(boolean)} when resolve complete. 
 	 * For each completed resolve {@link #cacheResolvedDataType(DataType, DataType)} 
 	 * should be invoked.
 	 * 
@@ -4356,7 +4577,42 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 		resolveQueue.add(new ResolvePair(resolvedDt, definitionDt));
 	}
 
-	void flushResolveQueue(boolean deactivateCache) {
+	/**
+	 * Process resolve queue, which  includes:
+	 * <ul>
+	 * <li>Process any deferred pointer resolves in {@code resolveQueue}</li>
+	 * <li>If deactivating cache {@code deactivateCache==true} the conflict queue will be 
+	 * processed</li>
+	 * <li>If deactivating cache {@code deactivateCache==true} the {@code resolveCache} will be
+	 * disposed.</li>
+	 * </ul>
+	 * @param deactivateCache true if caller is {@code resolveCache} owner as determined by call 
+	 * to {@link #activateResolveCache()}) at start of resolve cycle, else false.
+	 */
+	void processResolveQueue(boolean deactivateCache) {
+		processResolveQueue(deactivateCache, null);
+	}
+
+	/**
+	 * Process resolve queue, which  includes:
+	 * <ul>
+	 * <li>Process any deferred pointer resolves in {@code resolveQueue}</li>
+	 * <li>If deactivating cache {@code deactivateCache==true} the conflict queue will be 
+	 * processed</li>
+	 * <li>If deactivating cache {@code deactivateCache==true} the {@code resolveCache} will be
+	 * disposed.</li>
+	 * </ul>
+	 * 
+	 * @param deactivateCache true if caller is {@code resolveCache} owner as determined by call 
+	 * to {@link #activateResolveCache()}) at start of resolve cycle, else false.
+	 * @param dataType final resolved data type.  If {@code deactivateCache==true} and this type
+	 * is a newly created conflict type and this method and is able to replace with an equivalent 
+	 * data type the replacement datatype will be returned, otherwise the specified {@code dataType}
+	 * instance will be returned.
+	 * @return final resolved data type
+	 */
+	private DataType processResolveQueue(boolean deactivateCache, DataType dataType) {
+
 		try {
 			if (resolveQueue != null) {
 				DataTypeConflictHandler handler = getDependencyConflictHandler();
@@ -4364,7 +4620,9 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 					ResolvePair resolvePair = resolveQueue.pollFirst();
 					DataTypeDB resolvedDt = resolvePair.resolvedDt;
 					try {
-						resolvedDt.postPointerResolve(resolvePair.definitionDt, handler);
+						if (!resolvedDt.isDeleted()) {
+							resolvedDt.postPointerResolve(resolvePair.definitionDt, handler);
+						}
 					}
 					// TODO: catch exceptions if needed
 					finally {
@@ -4373,6 +4631,9 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 					}
 				}
 			}
+			if (deactivateCache) {
+				return processConflictQueue(dataType);
+			}
 		}
 		finally {
 			resolveQueue = null;
@@ -4380,6 +4641,7 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 				resolveCache = null;
 			}
 		}
+		return dataType;
 	}
 
 	private DataType getCachedResolve(DataType dt) {
@@ -4639,6 +4901,26 @@ abstract public class DataTypeManagerDB implements DataTypeManager {
 		}
 	}
 
+	/**
+	 * Diagnostic method to determine actual number of datatype records which exist.  This
+	 * may differ from the total number of datatypes reported via {@link DataTypeManager#getAllDataTypes()}
+	 * due to the manner in which datatypes are held in-memory (i.e., name-based indexed) if
+	 * duplicate datatype names exist within a category.
+	 * @return total number of datatype records.
+	 */
+	int getDataTypeRecordCount() {
+		lock.acquire();
+		try {
+			return builtinAdapter.getRecordCount() + compositeAdapter.getRecordCount() +
+				arrayAdapter.getRecordCount() + pointerAdapter.getRecordCount() +
+				typedefAdapter.getRecordCount() + functionDefAdapter.getRecordCount() +
+				enumAdapter.getRecordCount();
+		}
+		finally {
+			lock.release();
+		}
+	}
+
 }
 
 class CategoryCache extends FixedSizeHashMap<String, Category> {

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

@@ -16,7 +16,7 @@
 package ghidra.program.database.data;
 
 import java.util.*;
-import java.util.regex.Pattern;
+import java.util.regex.*;
 
 import ghidra.app.util.NamespaceUtils;
 import ghidra.app.util.SymbolPathParser;
@@ -306,7 +306,49 @@ public class DataTypeUtilities {
 	 */
 	public static String getNameWithoutConflict(DataType dataType, boolean includeCategoryPath) {
 		String name = includeCategoryPath ? dataType.getPathName() : dataType.getName();
-		return DATATYPE_CONFLICT_PATTERN.matcher(name).replaceAll("");
+		return getNameWithoutConflict(name);
+	}
+
+	/**
+	 * Get the name of a data type with all conflict naming patterns removed.
+	 * 
+	 * @param dataTypeName data type name with optional category path included
+	 * @return name with optional category path included
+	 */
+	public static String getNameWithoutConflict(String dataTypeName) {
+		return DATATYPE_CONFLICT_PATTERN.matcher(dataTypeName).replaceAll("");
+	}
+
+	/**
+	 * Get the conflict value string associated with a conflict datatype name.
+	 * 
+	 * @param dataType datatype to be checked
+	 * @return conflict value string.  Will be null if name is not a conflict name, or
+	 * empty string if conflict has no number.  Otherwise a decimal value string will be returned.
+	 */
+	public static String getConflictString(DataType dataType) {
+		return getConflictString(dataType.getName());
+	}
+
+	/**
+	 * Get the conflict value string associated with a conflict datatype name.
+	 * 
+	 * @param dataTypeName datatype name to be checked
+	 * @return conflict value string.  Will be one of the following:
+	 * <ol>
+	 * <li>A null value if not a conflict name,</li>
+	 * <li>an empty string if conflict name without a number, or</li>
+	 * <li>a decimal string value which corresponds to the conflict number in the name.</li>
+	 * </ol>
+	 */
+	public static String getConflictString(String dataTypeName) {
+		Matcher matcher = DATATYPE_CONFLICT_PATTERN.matcher(dataTypeName);
+		if (matcher.find()) {
+			MatchResult matchResult = matcher.toMatchResult();
+			return dataTypeName.substring(matchResult.start() + DataType.CONFLICT_SUFFIX.length(),
+				matchResult.end());
+		}
+		return null;
 	}
 
 	/**

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

@@ -30,6 +30,7 @@ import ghidra.docking.settings.SettingsDefinition;
 import ghidra.program.database.DBObjectCache;
 import ghidra.program.model.data.*;
 import ghidra.program.model.data.Enum;
+import ghidra.program.model.data.DataTypeConflictHandler.ConflictResult;
 import ghidra.program.model.mem.MemBuffer;
 import ghidra.program.model.mem.MemoryAccessException;
 import ghidra.program.model.scalar.Scalar;
@@ -601,7 +602,7 @@ class EnumDB extends DataTypeDB implements Enum {
 	}
 
 	@Override
-	public boolean isEquivalent(DataType dt) {
+	protected boolean isEquivalent(DataType dt, DataTypeConflictHandler handler) {
 		if (dt == this) {
 			return true;
 		}
@@ -610,15 +611,26 @@ class EnumDB extends DataTypeDB implements Enum {
 		}
 
 		Enum enumm = (Enum) dt;
-		if (!DataTypeUtilities.equalsIgnoreConflict(getName(), enumm.getName()) ||
+		if (!DataTypeUtilities.equalsIgnoreConflict(getName(), enumm.getName())) {
-			getLength() != enumm.getLength() || getCount() != enumm.getCount()) {
 			return false;
 		}
 
-		if (!isEachValueEquivalent(enumm)) {
+		if (handler != null &&
+			ConflictResult.USE_EXISTING == handler.resolveConflict(enumm, this)) {
+			// treat this type as equivalent if existing type will be used
+			return true;
+		}
+
+		if (getLength() != enumm.getLength() || getCount() != enumm.getCount()) {
 			return false;
 		}
-		return true;
+
+		return isEachValueEquivalent(enumm);
+	}
+
+	@Override
+	public boolean isEquivalent(DataType dt) {
+		return isEquivalent(dt, null);
 	}
 
 	private boolean isEachValueEquivalent(Enum enumm) {
@@ -895,6 +907,8 @@ class EnumDB extends DataTypeDB implements Enum {
 	public int getMinimumPossibleLength() {
 		lock.acquire();
 		try {
+			checkIsValid();
+			initializeIfNeeded();
 			if (valueMap.isEmpty()) {
 				return 1;
 			}

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

@@ -54,8 +54,7 @@ abstract class EnumDBAdapter {
 	 * @throws CancelledException if task cancelled
 	 */
 	static EnumDBAdapter getAdapter(DBHandle handle, int openMode, String tablePrefix,
-			TaskMonitor monitor)
+			TaskMonitor monitor) throws VersionException, IOException, CancelledException {
-			throws VersionException, IOException, CancelledException {
 		if (openMode == DBConstants.CREATE) {
 			return new EnumDBAdapterV1(handle, tablePrefix, true);
 		}
@@ -103,8 +102,7 @@ abstract class EnumDBAdapter {
 	 * @throws CancelledException if task cancelled
 	 */
 	private static EnumDBAdapter upgrade(DBHandle handle, EnumDBAdapter oldAdapter,
-			String tablePrefix,
+			String tablePrefix, TaskMonitor monitor)
-			TaskMonitor monitor)
 			throws VersionException, IOException, CancelledException {
 
 		DBHandle tmpHandle = new DBHandle();
@@ -216,4 +214,10 @@ abstract class EnumDBAdapter {
 	abstract DBRecord getRecordWithIDs(UniversalID sourceID, UniversalID datatypeID)
 			throws IOException;
 
+	/**
+	 * Get the number of enum datatype records
+	 * @return total number of composite records
+	 */
+	public abstract int getRecordCount();
+
 }

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

@@ -79,4 +79,8 @@ class EnumDBAdapterNoTable extends EnumDBAdapter {
 		return null;
 	}
 
+	@Override
+	public int getRecordCount() {
+		return 0;
+	}
 }

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/data/EnumDBAdapterV0.java

@@ -128,4 +128,9 @@ class EnumDBAdapterV0 extends EnumDBAdapter implements RecordTranslator {
 		return null;
 	}
 
+	@Override
+	public int getRecordCount() {
+		return enumTable.getRecordCount();
+	}
+
 }

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/data/EnumDBAdapterV1.java

@@ -139,8 +139,8 @@ class EnumDBAdapterV1 extends EnumDBAdapter {
 		Field[] keys = enumTable.findRecords(new LongField(datatypeID.getValue()),
 			V1_ENUM_UNIVERSAL_DT_ID_COL);
 
-		for (int i = 0; i < keys.length; i++) {
+		for (Field key : keys) {
-			DBRecord record = enumTable.getRecord(keys[i]);
+			DBRecord record = enumTable.getRecord(key);
 			if (record.getLongValue(V1_ENUM_SOURCE_ARCHIVE_ID_COL) == sourceID.getValue()) {
 				return record;
 			}
@@ -148,4 +148,9 @@ class EnumDBAdapterV1 extends EnumDBAdapter {
 		return null;
 	}
 
+	@Override
+	public int getRecordCount() {
+		return enumTable.getRecordCount();
+	}
+
 }

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

@@ -25,6 +25,7 @@ import ghidra.docking.settings.Settings;
 import ghidra.docking.settings.SettingsImpl;
 import ghidra.program.database.DBObjectCache;
 import ghidra.program.model.data.*;
+import ghidra.program.model.data.DataTypeConflictHandler.ConflictResult;
 import ghidra.program.model.lang.*;
 import ghidra.program.model.listing.Function;
 import ghidra.program.model.listing.FunctionSignature;
@@ -198,7 +199,7 @@ class FunctionDefinitionDB extends DataTypeDB implements FunctionDefinition {
 		}
 		finally {
 			if (isResolveCacheOwner) {
-				dataMgr.flushResolveQueue(true);
+				dataMgr.processResolveQueue(true);
 			}
 			lock.release();
 		}
@@ -429,12 +430,12 @@ class FunctionDefinitionDB extends DataTypeDB implements FunctionDefinition {
 	}
 
 	@Override
-	public boolean isEquivalent(DataType dataType) {
+	protected boolean isEquivalent(DataType dataType, DataTypeConflictHandler handler) {
 
 		if (dataType == this) {
 			return true;
 		}
-		if (!(dataType instanceof FunctionDefinition)) {
+		if (!(dataType instanceof FunctionDefinition sig)) {
 			return false;
 		}
 
@@ -452,7 +453,18 @@ class FunctionDefinitionDB extends DataTypeDB implements FunctionDefinition {
 		}
 
 		try {
-			isEquivalent = isEquivalentSignature((FunctionSignature) dataType);
+
+			if (handler != null &&
+				ConflictResult.USE_EXISTING == handler.resolveConflict(sig, this)) {
+				// treat this type as equivalent if existing type will be used
+				isEquivalent = true;
+			}
+			else {
+				if (handler != null) {
+					handler = handler.getSubsequentHandler();
+				}
+				isEquivalent = isEquivalentSignature(sig, handler);
+			}
 		}
 		finally {
 			dataMgr.putCachedEquivalence(this, dataType, isEquivalent);
@@ -461,7 +473,12 @@ class FunctionDefinitionDB extends DataTypeDB implements FunctionDefinition {
 	}
 
 	@Override
-	public boolean isEquivalentSignature(FunctionSignature signature) {
+	public boolean isEquivalent(DataType dt) {
+		return isEquivalent(dt, null);
+	}
+
+	private boolean isEquivalentSignature(FunctionSignature signature,
+			DataTypeConflictHandler handler) {
 		if (signature == this) {
 			return true;
 		}
@@ -476,10 +493,10 @@ class FunctionDefinitionDB extends DataTypeDB implements FunctionDefinition {
 			(hasVarArgs() == signature.hasVarArgs()) &&
 			(hasNoReturn() == signature.hasNoReturn())) {
 			ParameterDefinition[] args = signature.getArguments();
-			ParameterDefinition[] thisArgs = this.getArguments();
+			ParameterDefinitionDB[] thisArgs = this.getArguments();
 			if (args.length == thisArgs.length) {
 				for (int i = 0; i < args.length; i++) {
-					if (!thisArgs[i].isEquivalent(args[i])) {
+					if (!thisArgs[i].isEquivalent(args[i], handler)) {
 						return false;
 					}
 				}
@@ -489,6 +506,11 @@ class FunctionDefinitionDB extends DataTypeDB implements FunctionDefinition {
 		return false;
 	}
 
+	@Override
+	public boolean isEquivalentSignature(FunctionSignature signature) {
+		return isEquivalentSignature(signature, null);
+	}
+
 	@Override
 	protected void doSetCategoryPathRecord(long categoryID) throws IOException {
 		record.setLongValue(FunctionDefinitionDBAdapter.FUNCTION_DEF_CAT_ID_COL, categoryID);

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

@@ -152,6 +152,30 @@ final class ParameterDefinitionDB implements ParameterDefinition {
 		return record.getIntValue(FunctionParameterAdapter.PARAMETER_ORDINAL_COL);
 	}
 
+	boolean isEquivalent(ParameterDefinition parm, DataTypeConflictHandler handler) {
+		if (parm == null) {
+			return false;
+		}
+		if (getOrdinal() != parm.getOrdinal()) {
+			return false;
+		}
+
+		DataType dataType = getDataType();
+		DataType otherDataType = parm.getDataType();
+
+		// if they contain datatypes that have same ids, then we are essentially equivalent.
+		if (DataTypeUtilities.isSameDataType(dataType, otherDataType)) {
+			return true;
+		}
+
+		return DataTypeDB.isEquivalent(dataType, otherDataType, handler);
+	}
+
+	@Override
+	public boolean isEquivalent(ParameterDefinition parm) {
+		return isEquivalent(parm, null);
+	}
+
 	@Override
 	public boolean isEquivalent(Variable otherVar) {
 		if (otherVar == null) {
@@ -169,20 +193,6 @@ final class ParameterDefinitionDB implements ParameterDefinition {
 		return true;
 	}
 
-	@Override
-	public boolean isEquivalent(ParameterDefinition parm) {
-		if (parm == null) {
-			return false;
-		}
-		if (getOrdinal() != parm.getOrdinal()) {
-			return false;
-		}
-		if (!DataTypeUtilities.isSameOrEquivalentDataType(getDataType(), parm.getDataType())) {
-			return false;
-		}
-		return true;
-	}
-
 	@Override
 	public int compareTo(ParameterDefinition p) {
 		return getOrdinal() - p.getOrdinal();

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

@@ -126,7 +126,8 @@ class PointerDB extends DataTypeDB implements Pointer {
 			return this;
 		}
 		// don't clone referenced data-type to avoid potential circular reference
-		return new PointerDataType(getDataType(), hasLanguageDependantLength() ? -1 : getLength(), dtm);
+		return new PointerDataType(getDataType(), hasLanguageDependantLength() ? -1 : getLength(),
+			dtm);
 	}
 
 	@Override
@@ -143,7 +144,7 @@ class PointerDB extends DataTypeDB implements Pointer {
 		lock.acquire();
 		try {
 			checkIsValid();
-			if ( displayName == null ) {
+			if (displayName == null) {
 				// NOTE: Pointer display name only specifies length if null base type
 				DataType dt = getDataType();
 				if (dt == null) {
@@ -284,7 +285,7 @@ class PointerDB extends DataTypeDB implements Pointer {
 	}
 
 	@Override
-	public boolean isEquivalent(DataType dt) {
+	protected boolean isEquivalent(DataType dt, DataTypeConflictHandler handler) {
 		if (dt == null) {
 			return false;
 		}
@@ -322,7 +323,7 @@ class PointerDB extends DataTypeDB implements Pointer {
 			return false;
 		}
 
-		// TODO: The pointer deep-dive equivalence checking on the referenced datatype can 
+		// NOTE: The pointer deep-dive equivalence checking on the referenced datatype can 
 		// cause types containing pointers (composites, functions) to conflict when in
 		// reality the referenced type simply has multiple implementations which differ.
 		// Although without doing this Ghidra may fail to resolve dependencies which differ
@@ -337,13 +338,21 @@ class PointerDB extends DataTypeDB implements Pointer {
 
 		isEquivalentActive.set(true);
 		try {
-			return getDataType().isEquivalent(otherDataType);
+			if (handler != null) {
+				handler = handler.getSubsequentHandler();
+			}
+			return DataTypeDB.isEquivalent(referencedDataType, otherDataType, handler);
 		}
 		finally {
 			isEquivalentActive.set(false);
 		}
 	}
 
+	@Override
+	public boolean isEquivalent(DataType dt) {
+		return isEquivalent(dt, null);
+	}
+
 	@Override
 	public void dataTypeReplaced(DataType oldDt, DataType newDt) {
 		if (newDt == this) {
@@ -351,12 +360,36 @@ class PointerDB extends DataTypeDB implements Pointer {
 		}
 		lock.acquire();
 		try {
-			String myOldName = getOldName();
 			if (checkIsValid() && getDataType() == oldDt) {
+
+				// check for existing pointer to newDt
+				PointerDataType newPtr = new PointerDataType(newDt,
+					hasLanguageDependantLength() ? -1 : getLength(), dataMgr);
+				DataType existingPtr =
+					dataMgr.getDataType(newDt.getCategoryPath(), newPtr.getName());
+				if (existingPtr != null) {
+					// avoid duplicate pointer - replace this pointer with existing one
+					dataMgr.addDataTypeToReplace(this, existingPtr);
+					return;
+				}
+
+				if (!newDt.getCategoryPath().equals(oldDt.getCategoryPath())) {
+					// move this pointer to same category as newDt
+					try {
+						super.setCategoryPath(newDt.getCategoryPath());
+					}
+					catch (DuplicateNameException e) {
+						throw new RuntimeException(e); // already checked
+					}
+				}
+
+				String myOldName = getOldName();
 				oldDt.removeParent(this);
 				newDt.addParent(this);
+
 				record.setLongValue(PointerDBAdapter.PTR_DT_ID_COL, dataMgr.getResolvedID(newDt));
 				refreshName();
+
 				if (!oldDt.getName().equals(newDt.getName())) {
 					notifyNameChanged(myOldName);
 				}

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

@@ -163,4 +163,10 @@ abstract class PointerDBAdapter implements RecordTranslator {
 	 * @throws IOException if the database can't be accessed.
 	 */
 	abstract Field[] getRecordIdsInCategory(long categoryID) throws IOException;
+
+	/**
+	 * Get the number of pointer datatype records
+	 * @return total number of composite records
+	 */
+	public abstract int getRecordCount();
 }

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/data/PointerDBAdapterV0.java

@@ -96,4 +96,9 @@ class PointerDBAdapterV0 extends PointerDBAdapter {
 		handle.deleteTable(POINTER_TABLE_NAME);
 
 	}
+
+	@Override
+	public int getRecordCount() {
+		return table.getRecordCount();
+	}
 }

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/data/PointerDBAdapterV1.java

@@ -97,4 +97,9 @@ class PointerDBAdapterV1 extends PointerDBAdapter {
 		handle.deleteTable(POINTER_TABLE_NAME);
 	}
 
+	@Override
+	public int getRecordCount() {
+		return table.getRecordCount();
+	}
+
 }

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/data/PointerDBAdapterV2.java

@@ -102,4 +102,9 @@ class PointerDBAdapterV2 extends PointerDBAdapter {
 	public DBRecord translateRecord(DBRecord rec) {
 		return rec;
 	}
+
+	@Override
+	public int getRecordCount() {
+		return table.getRecordCount();
+	}
 }

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

@@ -16,7 +16,6 @@
 package ghidra.program.database.data;
 
 import java.io.IOException;
-import java.util.Iterator;
 import java.util.LinkedList;
 
 import db.*;
@@ -252,18 +251,21 @@ public class ProgramDataTypeManager extends ProgramBasedDataTypeManagerDB implem
 	}
 
 	@Override
-	protected void deleteDataTypeIDs(LinkedList<Long> deletedIds, TaskMonitor monitor)
+	protected void deleteDataTypeIDs(LinkedList<Long> deletedIds) {
-			throws CancelledException {
 		// TODO: SymbolManager/FunctionManager do not appear to handle datatype removal update.
 		// Suspect it handles indirectly through detection of deleted datatype.  Old deleted ID
 		// use could be an issue.
 		long[] ids = new long[deletedIds.size()];
-		Iterator<Long> it = deletedIds.iterator();
 		int i = 0;
-		while (it.hasNext()) {
+		for (Long deletedId : deletedIds) {
-			ids[i++] = it.next().longValue();
+			ids[i++] = deletedId.longValue();
+		}
+		try {
+			program.getCodeManager().clearData(ids, TaskMonitor.DUMMY);
+		}
+		catch (CancelledException e) {
+			// won't happen
 		}
-		program.getCodeManager().clearData(ids, monitor);
 		program.getFunctionManager().invalidateCache(false);
 	}
 

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

@@ -24,6 +24,7 @@ import ghidra.docking.settings.Settings;
 import ghidra.program.database.DBObjectCache;
 import ghidra.program.model.data.*;
 import ghidra.program.model.data.AlignedStructurePacker.StructurePackResult;
+import ghidra.program.model.data.DataTypeConflictHandler.ConflictResult;
 import ghidra.program.model.mem.MemBuffer;
 import ghidra.util.Msg;
 import ghidra.util.exception.AssertException;
@@ -1584,7 +1585,7 @@ class StructureDB extends CompositeDB implements StructureInternal {
 		}
 		finally {
 			if (isResolveCacheOwner) {
-				dataMgr.flushResolveQueue(true);
+				dataMgr.processResolveQueue(true);
 			}
 			lock.release();
 		}
@@ -1941,11 +1942,11 @@ class StructureDB extends CompositeDB implements StructureInternal {
 	}
 
 	@Override
-	public boolean isEquivalent(DataType dataType) {
+	protected boolean isEquivalent(DataType dataType, DataTypeConflictHandler handler) {
 		if (dataType == this) {
 			return true;
 		}
-		if (!(dataType instanceof StructureInternal)) {
+		if (!(dataType instanceof StructureInternal struct)) {
 			return false;
 		}
 
@@ -1964,7 +1965,14 @@ class StructureDB extends CompositeDB implements StructureInternal {
 
 		try {
 			isEquivalent = false;
-			StructureInternal struct = (StructureInternal) dataType;
+
+			if (handler != null &&
+				ConflictResult.USE_EXISTING == handler.resolveConflict(struct, this)) {
+				// treat this type as equivalent if existing type will be used
+				isEquivalent = true;
+				return true;
+			}
+
 			int otherLength = struct.isZeroLength() ? 0 : struct.getLength();
 			int packing = getStoredPackingValue();
 			if (packing != struct.getStoredPackingValue() ||
@@ -1982,10 +1990,14 @@ class StructureDB extends CompositeDB implements StructureInternal {
 			if (otherDefinedComponents.length != myNumComps) { // safety check
 				return false;
 			}
+			if (handler != null) {
+				handler = handler.getSubsequentHandler();
+				//dataMgr.getPostResolve(this);
+			}
 			for (int i = 0; i < myNumComps; i++) {
 				DataTypeComponent myDtc = components.get(i);
 				DataTypeComponent otherDtc = otherDefinedComponents[i];
-				if (!myDtc.isEquivalent(otherDtc)) {
+				if (!DataTypeComponentDB.isEquivalent(myDtc, otherDtc, handler)) {
 					return false;
 				}
 			}
@@ -1997,6 +2009,11 @@ class StructureDB extends CompositeDB implements StructureInternal {
 		return true;
 	}
 
+	@Override
+	public boolean isEquivalent(DataType dt) {
+		return isEquivalent(dt, null);
+	}
+
 	/**
 	 * Adjust length of specified component (by index) by consuming available undefined
 	 * bytes upto the specified number of bytes (numBytes).  The associated component record will

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

@@ -22,6 +22,7 @@ import ghidra.docking.settings.Settings;
 import ghidra.docking.settings.SettingsDefinition;
 import ghidra.program.database.DBObjectCache;
 import ghidra.program.model.data.*;
+import ghidra.program.model.data.DataTypeConflictHandler.ConflictResult;
 import ghidra.program.model.mem.MemBuffer;
 import ghidra.util.UniversalID;
 import ghidra.util.exception.DuplicateNameException;
@@ -249,29 +250,54 @@ class TypedefDB extends DataTypeDB implements TypeDef {
 	}
 
 	@Override
-	public boolean isEquivalent(DataType obj) {
+	protected boolean isEquivalent(DataType dt, DataTypeConflictHandler handler) {
-		if (obj == this) {
+		if (dt == this) {
 			return true;
 		}
-		if (obj == null || !(obj instanceof TypeDef)) {
+		if (dt == null || !(dt instanceof TypeDef)) {
 			return false;
 		}
-		TypeDef td = (TypeDef) obj;
+		TypeDef td = (TypeDef) dt;
 		validate(lock);
 
 		boolean autoNamed = isAutoNamed();
 		if (autoNamed != td.isAutoNamed()) {
 			return false;
 		}
+
 		if (!autoNamed && !DataTypeUtilities.equalsIgnoreConflict(getName(), td.getName())) {
 			return false;
 		}
+
 		if (!hasSameTypeDefSettings(td)) {
 			return false;
 		}
-		return DataTypeUtilities.isSameOrEquivalentDataType(getDataType(), td.getDataType());
+
+		if (handler != null && ConflictResult.USE_EXISTING == handler.resolveConflict(td, this)) {
+			// treat this type as equivalent if existing type will be used
+			return true;
+		}
+
+		// TODO: add pointer-post-resolve logic with resolving bypass (similar to StructureDB components)
+
+		DataType dataType = getDataType();
+		DataType otherDataType = td.getDataType();
+		if (DataTypeUtilities.isSameDataType(dataType, otherDataType)) {
+			return true;
+		}
+
+		if (handler != null) {
+			handler = handler.getSubsequentHandler();
+		}
+		return DataTypeDB.isEquivalent(dataType, otherDataType, handler);
 	}
 
+	@Override
+	public boolean isEquivalent(DataType dt) {
+		return isEquivalent(dt, null);
+	}
+
+	@Override
 	public void setCategoryPath(CategoryPath path) throws DuplicateNameException {
 		if (isAutoNamed()) {
 			return; // ignore category change if auto-naming enabled
@@ -387,6 +413,7 @@ class TypedefDB extends DataTypeDB implements TypeDef {
 		return getDataType().getTypeDefSettingsDefinitions();
 	}
 
+	@Override
 	protected Settings doGetDefaultSettings() {
 		DataTypeSettingsDB settings = new DataTypeSettingsDB(dataMgr, this, key);
 		settings.setLock(dataMgr instanceof BuiltInDataTypeManager);

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

@@ -60,8 +60,7 @@ abstract class TypedefDBAdapter {
 	 * @throws CancelledException if task is cancelled
 	 */
 	static TypedefDBAdapter getAdapter(DBHandle handle, int openMode, String tablePrefix,
-			TaskMonitor monitor)
+			TaskMonitor monitor) throws VersionException, IOException, CancelledException {
-			throws VersionException, IOException, CancelledException {
 		try {
 			return new TypedefDBAdapterV2(handle, tablePrefix, openMode == DBConstants.CREATE);
 		}
@@ -217,4 +216,10 @@ abstract class TypedefDBAdapter {
 	abstract DBRecord getRecordWithIDs(UniversalID sourceID, UniversalID datatypeID)
 			throws IOException;
 
+	/**
+	 * Get the number of typedef datatype records
+	 * @return total number of composite records
+	 */
+	public abstract int getRecordCount();
+
 }

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/data/TypedefDBAdapterV0.java

@@ -123,4 +123,8 @@ class TypedefDBAdapterV0 extends TypedefDBAdapter implements RecordTranslator {
 		return null;
 	}
 
+	@Override
+	public int getRecordCount() {
+		return table.getRecordCount();
+	}
 }

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/data/TypedefDBAdapterV1.java

@@ -108,8 +108,8 @@ class TypedefDBAdapterV1 extends TypedefDBAdapter implements RecordTranslator {
 	DBRecord getRecordWithIDs(UniversalID sourceID, UniversalID datatypeID) throws IOException {
 		Field[] keys =
 			table.findRecords(new LongField(datatypeID.getValue()), V1_TYPEDEF_UNIVERSAL_DT_ID_COL);
-		for (int i = 0; i < keys.length; i++) {
+		for (Field key : keys) {
-			DBRecord record = table.getRecord(keys[i]);
+			DBRecord record = table.getRecord(key);
 			if (record.getLongValue(V1_TYPEDEF_SOURCE_ARCHIVE_ID_COL) == sourceID.getValue()) {
 				return translateRecord(record);
 			}
@@ -137,4 +137,9 @@ class TypedefDBAdapterV1 extends TypedefDBAdapter implements RecordTranslator {
 			oldRec.getLongValue(V1_TYPEDEF_LAST_CHANGE_TIME_COL));
 		return rec;
 	}
+
+	@Override
+	public int getRecordCount() {
+		return table.getRecordCount();
+	}
 }

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/data/TypedefDBAdapterV2.java

@@ -138,8 +138,8 @@ class TypedefDBAdapterV2 extends TypedefDBAdapter {
 		Field[] keys =
 			table.findRecords(new LongField(datatypeID.getValue()), V2_TYPEDEF_UNIVERSAL_DT_ID_COL);
 
-		for (int i = 0; i < keys.length; i++) {
+		for (Field key : keys) {
-			DBRecord record = table.getRecord(keys[i]);
+			DBRecord record = table.getRecord(key);
 			if (record.getLongValue(V2_TYPEDEF_SOURCE_ARCHIVE_ID_COL) == sourceID.getValue()) {
 				return record;
 			}
@@ -147,4 +147,9 @@ class TypedefDBAdapterV2 extends TypedefDBAdapter {
 		return null;
 	}
 
+	@Override
+	public int getRecordCount() {
+		return table.getRecordCount();
+	}
+
 }

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

@@ -23,6 +23,7 @@ import db.Field;
 import ghidra.docking.settings.Settings;
 import ghidra.program.database.DBObjectCache;
 import ghidra.program.model.data.*;
+import ghidra.program.model.data.DataTypeConflictHandler.ConflictResult;
 import ghidra.program.model.mem.MemBuffer;
 import ghidra.util.Msg;
 
@@ -312,7 +313,7 @@ class UnionDB extends CompositeDB implements UnionInternal {
 		}
 		finally {
 			if (isResolveCacheOwner) {
-				dataMgr.flushResolveQueue(true);
+				dataMgr.processResolveQueue(true);
 			}
 			lock.release();
 		}
@@ -722,12 +723,11 @@ class UnionDB extends CompositeDB implements UnionInternal {
 	}
 
 	@Override
-	public boolean isEquivalent(DataType dataType) {
+	protected boolean isEquivalent(DataType dataType, DataTypeConflictHandler handler) {
-
 		if (dataType == this) {
 			return true;
 		}
-		if (!(dataType instanceof UnionInternal)) {
+		if (!(dataType instanceof UnionInternal union)) {
 			return false;
 		}
 
@@ -746,7 +746,14 @@ class UnionDB extends CompositeDB implements UnionInternal {
 
 		try {
 			isEquivalent = false;
-			UnionInternal union = (UnionInternal) dataType;
+
+			if (handler != null &&
+				ConflictResult.USE_EXISTING == handler.resolveConflict(union, this)) {
+				// treat this type as equivalent if existing type will be used
+				isEquivalent = true;
+				return true;
+			}
+
 			if (getStoredPackingValue() != union.getStoredPackingValue() ||
 				getStoredMinimumAlignment() != union.getStoredMinimumAlignment()) {
 				// rely on component match instead of checking length 
@@ -758,8 +765,11 @@ class UnionDB extends CompositeDB implements UnionInternal {
 			if (myComps.length != otherComps.length) {
 				return false;
 			}
+			if (handler != null) {
+				handler = handler.getSubsequentHandler();
+			}
 			for (int i = 0; i < myComps.length; i++) {
-				if (!myComps[i].isEquivalent(otherComps[i])) {
+				if (!DataTypeComponentDB.isEquivalent(myComps[i], otherComps[i], handler)) {
 					return false;
 				}
 			}
@@ -771,6 +781,11 @@ class UnionDB extends CompositeDB implements UnionInternal {
 		return true;
 	}
 
+	@Override
+	public boolean isEquivalent(DataType dt) {
+		return isEquivalent(dt, null);
+	}
+
 	private void shiftOrdinals(int ordinal, int deltaOrdinal) {
 		for (int i = ordinal; i < components.size(); i++) {
 			DataTypeComponentDB dtc = components.get(i);

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/util/DBRecordAdapter.java

@@ -33,7 +33,7 @@ public interface DBRecordAdapter {
 	public RecordIterator getRecords() throws IOException;
 
 	/**
-	 * Get the number of records in table
+	 * Get the number of function definition datatype records
 	 * @return total record count
 	 */
 	public int getRecordCount();

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

@@ -59,6 +59,9 @@ public interface Category extends Comparable<Category> {
 	 * occurs. In other words, finds all data types whose name matches the given name once
 	 * any conflict suffixes have been removed from both the given name and the data types
 	 * that are being scanned.
+	 * <br>
+	 * NOTE: The {@code name} provided must not contain array or pointer decorations.
+	 * 
 	 * @param name the name for which to get conflict related data types in this category. Note:
 	 * the name that is passed in will be normalized to its base name, so you may pass in names
 	 * with .conflict appended as a convenience.

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

@@ -49,7 +49,7 @@ public interface Composite extends DataType {
 
 	/**
 	 * Returns the component of this data type with the indicated ordinal.
-	 * @param ordinal the component's ordinal (zero based).
+	 * @param ordinal the component's ordinal (numbering starts at 0).
 	 * @return the data type component.
 	 * @throws IndexOutOfBoundsException if the ordinal is out of bounds
 	 */
@@ -155,7 +155,7 @@ public interface Composite extends DataType {
 	 * Inserts a new datatype at the specified ordinal position in this composite.
 	 * <BR>Note: For an aligned structure the ordinal position will get adjusted
 	 * automatically to provide the proper alignment.
-	 * @param ordinal the ordinal where the new datatype is to be inserted.
+	 * @param ordinal the ordinal where the new datatype is to be inserted (numbering starts at 0).
 	 * @param dataType the datatype to insert.
 	 * @return the componentDataType created.
 	 * @throws IllegalArgumentException if the specified data type is not
@@ -171,7 +171,7 @@ public interface Composite extends DataType {
 	 * Inserts a new datatype at the specified ordinal position in this composite.
 	 * <BR>Note: For an aligned structure the ordinal position will get adjusted
 	 * automatically to provide the proper alignment.
-	 * @param ordinal the ordinal where the new datatype is to be inserted.
+	 * @param ordinal the ordinal where the new datatype is to be inserted (numbering starts at 0).
 	 * @param dataType the datatype to insert.
 	 * @param length the length to associate with the datatype.
 	 * For fixed length types a length &lt;= 0 will use the length of the resolved dataType.
@@ -190,7 +190,7 @@ public interface Composite extends DataType {
 	 * Inserts a new datatype at the specified ordinal position in this composite.
 	 * <BR>Note: For an aligned structure the ordinal position will get adjusted
 	 * automatically to provide the proper alignment.
-	 * @param ordinal the ordinal where the new datatype is to be inserted.
+	 * @param ordinal the ordinal where the new datatype is to be inserted (numbering starts at 0).
 	 * @param dataType the datatype to insert.
 	 * @param length the length to associate with the datatype.
 	 * For fixed length types a length &lt;= 0 will use the length of the resolved dataType.
@@ -211,7 +211,7 @@ public interface Composite extends DataType {
 	 * Deletes the component at the given ordinal position.
 	 * <BR>Note: Removal of bitfields from a structure with packing disabled will
 	 * not shift other components causing vacated bytes to revert to undefined filler.
-	 * @param ordinal the ordinal of the component to be deleted.
+	 * @param ordinal the ordinal of the component to be deleted (numbering starts at 0).
 	 * @throws IndexOutOfBoundsException if component ordinal is out of bounds
 	 */
 	public void delete(int ordinal) throws IndexOutOfBoundsException;

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

@@ -17,50 +17,49 @@ package ghidra.program.model.data;
 
 import java.util.Comparator;
 
-public class DataTypeComparator implements Comparator<Object> {
+/**
+ * {@link DataTypeComparator} provides the preferred named-based comparison of {@link DataType}
+ * which utilizes the {@link DataTypeNameComparator} for a primary {@link DataType#getName() name} 
+ * comparison followed by sub-ordering on {@link DataTypeManager} name and {@link CategoryPath}.
+ */
+public class DataTypeComparator implements Comparator<DataType> {
+
+	public static DataTypeComparator INSTANCE = new DataTypeComparator();
 
 	@Override
-	public int compare(Object o1, Object o2) {
+	public int compare(DataType dt1, DataType dt2) {
+		String name1 = dt1.getName();
+		String name2 = dt2.getName();
 
-		if (o1 instanceof DataType && o2 instanceof DataType) {
+		int nameCompare = DataTypeNameComparator.INSTANCE.compare(name1, name2);
-			DataType dt1 = (DataType) o1;
+		if (nameCompare == 0) {
-			DataType dt2 = (DataType) o2;
 
-			String name1 = dt1.getName();
+			DataTypeManager dtm1 = dt1.getDataTypeManager();
-			String name2 = dt2.getName();
+			String dtmName1 = dtm1 != null ? dtm1.getName() : null;
 
-			// if the names are the same, then sort by the path            
+			DataTypeManager dtm2 = dt2.getDataTypeManager();
-			int nameResult = name1.compareToIgnoreCase(name2);
+			String dtmName2 = dtm2 != null ? dtm2.getName() : null;
-			if (nameResult != 0) {
+
-				return nameResult;
+			if (dtm1 == null) {
+				if (dtm2 != null) {
+					return -1;
+				}
+			}
+			if (dtm2 == null) {
+				return 1;
 			}
 
-			String dtmName1 = dt1.getDataTypeManager().getName();
+			// Compare DataTypeManager names if datatypes have the same name
-			String dtmName2 = dt2.getDataTypeManager().getName();
+			int compare = dtmName1.compareTo(dtmName2);
+			if (compare == 0) {
 
-			// if they have the same name, and are in the same DTM, then compare paths
+				// Compare category paths if they have the same name and DTM
-			int dtmResult = dtmName1.compareToIgnoreCase(dtmName2);
+				String catPath1 = dt1.getCategoryPath().getPath();
-			if (dtmResult != 0) {
+				String catPath2 = dt2.getCategoryPath().getPath();
-				return dtmResult;
+				compare = catPath1.compareTo(catPath2);
 			}
-
+			return compare;
-			return dt1.getPathName().compareToIgnoreCase(dt2.getPathName());
 		}
-		// these cases are for lookups by string keys        
+		return nameCompare;
-		else if (o1 instanceof String && o2 instanceof DataType) {
-
-			DataType dt2 = (DataType) o2;
-			String name2 = dt2.getName();
-
-			return ((String) o1).compareToIgnoreCase(name2);
-		}
-		else if (o1 instanceof DataType && o2 instanceof String) {
-			DataType dt1 = (DataType) o1;
-			String name1 = dt1.getName();
-
-			return name1.compareToIgnoreCase(((String) o2));
-		}
-
-		return 0;
 	}
 }

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

@@ -167,15 +167,19 @@ public interface DataTypeManager {
 	/**
 	 * Begin searching at the root category for all data types with the
 	 * given name. Places all the data types in this data type manager
-	 * with the given name into the list.
+	 * with the given name into the list.  Presence of {@code .conflict}
-	 * @param name name of the data type
+	 * extension will be ignored for both specified name and returned
+	 * results.
+	 * @param name name of the data type (wildcards are not supported and will be treated
+	 * as explicit search characters)
 	 * @param list list that will be populated with matching DataType objects
 	 */
 	public void findDataTypes(String name, List<DataType> list);
 
 	/**
 	 * Begin searching at the root category for all data types with names
-	 * that match the given name that may contain wildcards.
+	 * that match the given name that may contain wildcards using familiar globbing 
+	 * characters '*' and '?'.
 	 * @param name name to match; may contain wildcards
 	 * @param list list that will be populated with matching DataType objects
 	 * @param caseSensitive true if the match is case sensitive

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

@@ -0,0 +1,102 @@
+/* ###
+ * IP: GHIDRA
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package ghidra.program.model.data;
+
+import java.util.*;
+
+import ghidra.program.database.data.DataTypeUtilities;
+
+/**
+ * {@link DataTypeNameComparator} provides the preferred named-based comparison of {@link DataType}
+ * which handles both some degree of case-insensity as well as proper grouping and ordering of
+ * conflict datatypes.
+ */
+public class DataTypeNameComparator implements Comparator<String> {
+
+	public static final DataTypeNameComparator INSTANCE = new DataTypeNameComparator();
+
+	@Override
+	public int compare(String dt1Name, String dt2Name) {
+
+		String name1 = DataTypeUtilities.getNameWithoutConflict(dt1Name);
+		String name2 = DataTypeUtilities.getNameWithoutConflict(dt2Name);
+
+		int len1 = name1.length();
+		int len2 = name2.length();
+
+		int len = Math.min(len1, len2); // overlapping length
+		int baseNameLen = len; // Length of overlapping portion of base-name (no decorations)
+
+		// Case-insensitive compare of significant overlapping portion of name
+		int baseCaseCompare = 0;
+		for (int i = 0; i < len; i++) {
+			char c1 = name1.charAt(i);
+			char c2 = name2.charAt(i);
+			char lc1 = Character.toLowerCase(c1);
+			char lc2 = Character.toLowerCase(c2);
+			// first space treated as end of base-name
+			if (lc1 == ' ') {
+				if (lc2 == ' ') {
+					baseNameLen = i;
+					break;
+				}
+				return -1;
+			}
+			if (lc2 == ' ') {
+				return 1;
+			}
+			if (lc1 != lc2) {
+				return lc1 - lc2;
+			}
+			if (baseCaseCompare == 0) {
+				baseCaseCompare = c1 - c2;
+			}
+		}
+
+		if (len1 > baseNameLen && name1.charAt(baseNameLen) != ' ') {
+			return 1; // first name has longer base-name
+		}
+
+		if (len2 > baseNameLen && name2.charAt(baseNameLen) != ' ') {
+			return -1; // second name has longer base-name
+		}
+
+		if (baseCaseCompare != 0) {
+			return baseCaseCompare;
+		}
+
+		// Same base-name, order by conflict
+		int conflict1 = getConflictValue(dt1Name);
+		int conflict2 = getConflictValue(dt2Name);
+		if (conflict1 != conflict2) {
+			return conflict1 - conflict2;
+		}
+
+		return name1.compareTo(name2);
+	}
+
+	private int getConflictValue(String dtName) {
+		String conflict = DataTypeUtilities.getConflictString(dtName);
+		if (conflict == null) {
+			return -1;
+		}
+		if (conflict.length() == 0) {
+			return 0;
+		}
+		return Integer.parseInt(conflict);
+	}
+
+}

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

@@ -0,0 +1,70 @@
+/* ###
+ * IP: GHIDRA
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package ghidra.program.model.data;
+
+import java.util.Comparator;
+
+/**
+ * {@link DataTypeObjectComparator} provides the preferred named-based comparison of data types
+ * using the {@link DataTypeNameComparator} allowing a mix of {@link DataType} and/or {@link String}
+ * names to be compared. 
+ */
+public class DataTypeObjectComparator implements Comparator<Object> {
+
+	public static DataTypeObjectComparator INSTANCE = new DataTypeObjectComparator();
+
+	/**
+	 * Compare two data type names
+	 * @param o1 the first {@link DataType} or {@link String} name to be compared.
+	 * @param o2 the second {@link DataType} or {@link String} name to be compared.
+	 * @return a negative integer, zero, or a positive integer as the
+	 *         first argument is less than, equal to, or greater than the
+	 *         second.
+	 * @throws IllegalArgumentException if object types other than {@link DataType} or 
+	 * {@link String} are compared.
+	 */
+	@Override
+	public int compare(Object o1, Object o2) {
+
+		String name1, name2;
+		if (o1 instanceof DataType && o2 instanceof DataType) {
+			DataType dt1 = (DataType) o1;
+			name1 = dt1.getName();
+			DataType dt2 = (DataType) o2;
+			name2 = dt2.getName();
+		}
+		// these cases are for lookups by string keys        
+		else if (o1 instanceof String && o2 instanceof DataType) {
+			name1 = (String) o1;
+			DataType dt2 = (DataType) o2;
+			name2 = dt2.getName();
+		}
+		else if (o1 instanceof DataType && o2 instanceof String) {
+			DataType dt1 = (DataType) o1;
+			name1 = dt1.getName();
+			name2 = (String) o2;
+		}
+		else if (o1 instanceof String && o2 instanceof String) {
+			name1 = (String) o1;
+			name2 = (String) o2;
+		}
+		else {
+			throw new IllegalArgumentException("Unsupported comparison " +
+				o1.getClass().getSimpleName() + " / " + o2.getClass().getSimpleName());
+		}
+		return DataTypeNameComparator.INSTANCE.compare(name1, name2);
+	}
+}

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

@@ -875,7 +875,7 @@ public class StandAloneDataTypeManager extends DataTypeManagerDB implements Clos
 	}
 
 	@Override
-	protected void deleteDataTypeIDs(LinkedList<Long> deletedIds, TaskMonitor monitor) {
+	protected void deleteDataTypeIDs(LinkedList<Long> deletedIds) {
 		// do nothing
 	}
 

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

@@ -36,7 +36,7 @@ public interface Structure extends Composite {
 	/**
 	 * Returns the component of this structure with the indicated ordinal.
 	 * 
-	 * @param ordinal the ordinal of the component requested.
+	 * @param ordinal the ordinal of the component requested (numbering starts at 0).
 	 * @return the data type component.
 	 * @throws IndexOutOfBoundsException if the ordinal is out of bounds
 	 */
@@ -151,7 +151,7 @@ public interface Structure extends Composite {
 	 * with bit-7 (msb) of the first byte for big-endian. This is the default behavior for most
 	 * compilers. Insertion behavior may not work as expected if packing rules differ from this.
 	 * 
-	 * @param ordinal the ordinal of the component to be inserted.
+	 * @param ordinal the ordinal of the component to be inserted (numbering starts at 0).
 	 * @param byteWidth the storage allocation unit width which contains the bitfield. Must be large
 	 *            enough to contain the "effective bit size" and corresponding bitOffset. The actual
 	 *            component size used will be recomputed during insertion.
@@ -305,7 +305,7 @@ public interface Structure extends Composite {
 	 * which may not result in such undefined components.  In the case of a packed structure 
 	 * clearing is always completed without backfill. 
 	 * 
-	 * @param ordinal the ordinal of the component to clear.
+	 * @param ordinal the ordinal of the component to clear (numbering starts at 0).
 	 * @throws IndexOutOfBoundsException if component ordinal is out of bounds
 	 */
 	public void clearComponent(int ordinal) throws IndexOutOfBoundsException;
@@ -331,7 +331,7 @@ public interface Structure extends Composite {
 	 * NOTE: In general, it is not recommended that this method be used with non-packed 
 	 * structures where the replaced component is a bit-field.
 	 * 
-	 * @param ordinal the ordinal of the component to be replaced.
+	 * @param ordinal the ordinal of the component to be replaced (numbering starts at 0).
 	 * @param dataType the datatype to insert. If {@link DataType#DEFAULT} is specified for a packed 
 	 *             structure an {@link Undefined1DataType} will be used in its place.  If {@link DataType#DEFAULT} 
 	 *             is specified for a non-packed structure this is equivelant to {@link #clearComponent(int)}, ignoring
@@ -368,7 +368,7 @@ public interface Structure extends Composite {
 	 * NOTE: In general, it is not recommended that this method be used with non-packed 
 	 * structures where the replaced component is a bit-field.
 	 * 
-	 * @param ordinal the ordinal of the component to be replaced.
+	 * @param ordinal the ordinal of the component to be replaced (numbering starts at 0).
 	 * @param dataType the datatype to insert.  If {@link DataType#DEFAULT} is specified for a packed 
 	 *             structure an {@link Undefined1DataType} will be used in its place.  If {@link DataType#DEFAULT} 
 	 *             is specified for a non-packed structure this is equivelant to {@link #clearComponent(int)}, ignoring

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

@@ -168,20 +168,28 @@ public class TypedefDataType extends GenericDataType implements TypeDef {
 		if (obj == this) {
 			return true;
 		}
-		if (obj instanceof TypeDef) {
+		if (!(obj instanceof TypeDef td)) {
-			TypeDef td = (TypeDef) obj;
+			return false;
-			if (isAutoNamed != td.isAutoNamed()) {
-				return false;
-			}
-			if (!isAutoNamed && !DataTypeUtilities.equalsIgnoreConflict(getName(), td.getName())) {
-				return false;
-			}
-			if (!hasSameTypeDefSettings(td)) {
-				return false;
-			}
-			return DataTypeUtilities.isSameOrEquivalentDataType(getDataType(), td.getDataType());
 		}
-		return false;
+
+		if (isAutoNamed != td.isAutoNamed()) {
+			return false;
+		}
+
+		if (!isAutoNamed && !DataTypeUtilities.equalsIgnoreConflict(getName(), td.getName())) {
+			return false;
+		}
+
+		if (!hasSameTypeDefSettings(td)) {
+			return false;
+		}
+
+		DataType otherDataType = td.getDataType();
+		if (DataTypeUtilities.isSameDataType(dataType, otherDataType)) {
+			return true;
+		}
+
+		return dataType.isEquivalent(otherDataType);
 	}
 
 	@Override
@@ -235,8 +243,7 @@ public class TypedefDataType extends GenericDataType implements TypeDef {
 		}
 		TypedefDataType newTypedef =
 			new TypedefDataType(typedef.getCategoryPath(), typedef.getName(), typedef.getDataType(),
-				typedef.getUniversalID(),
+				typedef.getUniversalID(), typedef.getSourceArchive(), typedef.getLastChangeTime(),
-				typedef.getSourceArchive(), typedef.getLastChangeTime(),
 				typedef.getLastChangeTimeInSourceArchive(), dtm);
 		copyTypeDefSettings(typedef, newTypedef, false);
 		newTypedef.isAutoNamed = typedef.isAutoNamed();

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

@@ -33,7 +33,7 @@ public interface Union extends Composite {
 	 * for little-endian, and with bit-7 (msb) of the first byte for big-endian.  This is the 
 	 * default behavior for most compilers.  Insertion behavior may not work as expected if 
 	 * packing rules differ from this.
-	 * @param ordinal the ordinal where the new datatype is to be inserted.
+	 * @param ordinal the ordinal where the new datatype is to be inserted (numbering starts at 0).
 	 * @param baseDataType the bitfield base datatype (certain restrictions apply).
 	 * @param bitSize the declared bitfield size in bits.  The effective bit size may be
 	 * adjusted based upon the specified baseDataType.

Ghidra/Framework/SoftwareModeling/src/test/java/ghidra/program/database/data/DataTypeDBReplaceTest.java

@@ -0,0 +1,265 @@
+/* ###
+ * IP: GHIDRA
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package ghidra.program.database.data;
+
+import static org.junit.Assert.*;
+
+import java.util.Iterator;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import generic.test.AbstractGenericTest;
+import ghidra.program.model.data.*;
+
+public class DataTypeDBReplaceTest extends AbstractGenericTest {
+
+	private DataTypeManagerDB dataMgr;
+
+	@Before
+	public void setUp() throws Exception {
+		dataMgr = new StandAloneDataTypeManager("dummyDTM");
+		dataMgr.startTransaction("Test");
+	}
+
+	@Test
+	public void testReplaceHandlingPointers() throws Exception {
+
+		Structure s1 = new StructureDataType(new CategoryPath("/P1"), "MyStruct1", 0, dataMgr);
+		s1.add(ByteDataType.dataType);
+		Structure sDb1 = (Structure) dataMgr.resolve(s1, null);
+
+		Structure s2 = new StructureDataType(new CategoryPath("/P2"), "MyStruct2", 0, dataMgr);
+		s2.add(new PointerDataType(s1)); // MyStruct1*
+		Structure sDb2 = (Structure) dataMgr.resolve(s2, null);
+		DataType ptrDb1 = sDb2.getComponent(0).getDataType(); // MyStruct1*
+
+		Structure s3 = new StructureDataType(new CategoryPath("/P3"), "MyStruct3", 0, dataMgr);
+		s3.add(new PointerDataType(new PointerDataType(s2))); // MyStruct2**
+		Structure sDb3 = (Structure) dataMgr.resolve(s3, null);
+		Pointer ptrDb2a = (Pointer) sDb3.getComponent(0).getDataType(); // MyStruct2**
+		Pointer ptrDb2b = (Pointer) ptrDb2a.getDataType(); // MyStruct2*
+
+		assertTrue(sDb3.isEquivalent(s3));
+
+		assertEquals(8, getDataTypeCount()); // include "undefined" type used during resolve
+
+		dataMgr.replaceDataType(sDb2, sDb1, false);
+
+		System.out.println("---");
+
+		assertTrue("Expected MyStruct2* to be replaced by MyStruct1*", ptrDb2b.isDeleted());
+		assertFalse("Expected /P2/MyStruct2** to be moved/transformed to /P1/MyStruct1**",
+			ptrDb2a.isDeleted());
+
+		// Pointer instance should have changed category as well as using MyStruct1*
+		Pointer ptrPtr = (Pointer) sDb3.getComponent(0).getDataType(); // MyStruct1**
+		assertTrue(ptrDb2a == ptrPtr);
+		assertEquals("/P1/MyStruct1 * *", ptrPtr.getPathName());
+
+		// Existing MyStruct1* pointer instance should be used and MyStruct2* removed
+		Pointer ptr = (Pointer) ptrPtr.getDataType(); // MyStruct1*
+		assertTrue(ptrDb1 == ptr);
+		assertEquals("/P1/MyStruct1 *", ptr.getPathName());
+
+		assertEquals(6, getDataTypeCount()); // include "undefined" type used during resolve
+
+	}
+
+	@Test
+	public void testReplaceHandlingArrays() throws Exception {
+
+		Structure s1 = new StructureDataType(new CategoryPath("/P1"), "MyStruct1", 0, dataMgr);
+		s1.add(ByteDataType.dataType);
+		Structure sDb1 = (Structure) dataMgr.resolve(s1, null);
+
+		Structure s2 = new StructureDataType(new CategoryPath("/P2"), "MyStruct2", 0, dataMgr);
+		s2.add(WordDataType.dataType);
+		Structure sDb2 = (Structure) dataMgr.resolve(s2, null);
+
+		Structure s3 = new StructureDataType(new CategoryPath("/P3"), "MyStruct3", 0, dataMgr);
+		s3.add(new ArrayDataType(s1, 3, -1)); // MyStruct1[3]
+		s3.add(new ArrayDataType(s2, 2, -1)); // MyStruct2[2]
+		s3.add(new ArrayDataType(new ArrayDataType(s2, 3, -1), 2, -1)); // MyStruct2[2][3]
+
+		Structure sDb3 = (Structure) dataMgr.resolve(s3, null);
+		Array aDb1_3 = (Array) sDb3.getComponent(0).getDataType(); // 0: MyStruct1[3]
+		Array aDb2_2 = (Array) sDb3.getComponent(1).getDataType(); // 1: MyStruct2[2]
+		Array aDb2_3_2 = (Array) sDb3.getComponent(2).getDataType(); // 2: MyStruct2[2][3]
+		Array aDb2_3 = (Array) aDb2_3_2.getDataType(); // MyStruct2[3]
+
+		//@formatter:off
+		assertEquals("/P3/MyStruct3\n" + 
+			"pack(disabled)\n" + 
+			"Structure MyStruct3 {\n" + 
+			"   0   MyStruct1[3]   3      \"\"\n" + 
+			"   3   MyStruct2[2]   4      \"\"\n" + 
+			"   7   MyStruct2[2][3]   12      \"\"\n" + 
+			"}\n" + 
+			"Size = 19   Actual Alignment = 1\n", sDb3.toString());
+		//@formatter:on
+
+		assertTrue(sDb3.isEquivalent(s3));
+
+		assertEquals(9, getDataTypeCount()); // include "undefined" type used during resolve
+
+		dataMgr.replaceDataType(sDb2, sDb1, false);
+
+		System.out.println("---");
+
+		assertFalse("Expected no change", aDb1_3.isDeleted());
+		assertFalse("Expected MyStruct2[2] to be moved/transformed to MyStruct1[2]",
+			aDb2_2.isDeleted());
+		assertFalse("Expected MyStruct2[3][2] to be moved/transformed to MyStruct1[3][2]",
+			aDb2_3_2.isDeleted());
+		assertTrue("Expected MyStruct2[3] to be replaced by MyStruct1[3]", aDb2_3.isDeleted());
+
+		DataTypeComponent[] definedComponents = sDb3.getDefinedComponents();
+		assertEquals(3, definedComponents.length);
+
+		// Array instance should have changed category as well as using MyStruct1
+		Array a1 = (Array) definedComponents[1].getDataType(); // MyStruct1[2]
+		assertTrue(aDb2_2 == a1);
+		assertEquals("/P1/MyStruct1[2]", a1.getPathName());
+
+		// Array instance should have changed category as well as using MyStruct1[3]
+		Array a1a = (Array) definedComponents[2].getDataType(); // MyStruct1[3][2]
+		assertTrue(aDb2_3_2 == a1a);
+		assertEquals("/P1/MyStruct1[2][3]", a1a.getPathName());
+
+		// Existing MyStruct1[3] array instance should be used and MyStruct2[3] removed
+		Array a1b = (Array) a1a.getDataType(); // MyStruct1[3]
+		assertTrue(aDb1_3 == a1b);
+		assertEquals("/P1/MyStruct1[3]", a1b.getPathName());
+
+		// Component placements should not change but sizes will
+		//@formatter:off
+		assertEquals("/P3/MyStruct3\n" + 
+			"pack(disabled)\n" + 
+			"Structure MyStruct3 {\n" + 
+			"   0   MyStruct1[3]   3      \"\"\n" + 
+			"   3   MyStruct1[2]   2      \"\"\n" + 
+			"   7   MyStruct1[2][3]   6      \"\"\n" + 
+			"}\n" + 
+			"Size = 19   Actual Alignment = 1\n", sDb3.toString());
+		//@formatter:on
+
+		assertEquals(7, getDataTypeCount()); // include "undefined" type used during resolve
+
+	}
+
+	@Test
+	public void testReplaceHandlingArraysPacked() throws Exception {
+
+		Structure s1 = new StructureDataType(new CategoryPath("/P1"), "MyStruct1", 0, dataMgr);
+		s1.setPackingEnabled(true);
+		s1.add(ByteDataType.dataType);
+		Structure sDb1 = (Structure) dataMgr.resolve(s1, null);
+
+		Structure s2 = new StructureDataType(new CategoryPath("/P2"), "MyStruct2", 0, dataMgr);
+		s2.setPackingEnabled(true);
+		s2.add(WordDataType.dataType);
+		Structure sDb2 = (Structure) dataMgr.resolve(s2, null);
+
+		Structure s3 = new StructureDataType(new CategoryPath("/P3"), "MyStruct3", 0, dataMgr);
+		s3.setPackingEnabled(true);
+		s3.add(new ArrayDataType(s1, 3, -1)); // MyStruct1[3]
+		s3.add(new ArrayDataType(s2, 2, -1)); // MyStruct2[2]
+		s3.add(new ArrayDataType(new ArrayDataType(s2, 3, -1), 2, -1)); // MyStruct2[2][3]
+
+		Structure sDb3 = (Structure) dataMgr.resolve(s3, null);
+		Array aDb1_3 = (Array) sDb3.getComponent(0).getDataType(); // 0: MyStruct1[3]
+		Array aDb2_2 = (Array) sDb3.getComponent(1).getDataType(); // 1: MyStruct2[2]
+		Array aDb2_3_2 = (Array) sDb3.getComponent(2).getDataType(); // 2: MyStruct2[2][3]
+		Array aDb2_3 = (Array) aDb2_3_2.getDataType(); // MyStruct2[3]
+
+		//@formatter:off
+		assertEquals("/P3/MyStruct3\n" + 
+			"pack()\n" + 
+			"Structure MyStruct3 {\n" + 
+			"   0   MyStruct1[3]   3      \"\"\n" + 
+			"   4   MyStruct2[2]   4      \"\"\n" + 
+			"   8   MyStruct2[2][3]   12      \"\"\n" + 
+			"}\n" + 
+			"Size = 20   Actual Alignment = 2\n", sDb3.toString());
+		//@formatter:on
+
+		assertTrue(sDb3.isEquivalent(s3));
+
+		assertEquals(9, getDataTypeCount()); // include "undefined" type used during resolve
+
+		dataMgr.replaceDataType(sDb2, sDb1, false);
+
+		assertFalse("Expected no change", aDb1_3.isDeleted());
+		assertFalse("Expected MyStruct2[2] to be moved/transformed to MyStruct1[2]",
+			aDb2_2.isDeleted());
+		assertFalse("Expected MyStruct2[3][2] to be moved/transformed to MyStruct1[3][2]",
+			aDb2_3_2.isDeleted());
+		assertTrue("Expected MyStruct2[3] to be replaced by MyStruct1[3]", aDb2_3.isDeleted());
+
+		DataTypeComponent[] definedComponents = sDb3.getDefinedComponents();
+		assertEquals(3, definedComponents.length);
+
+		// Array instance should have changed category as well as using MyStruct1
+		Array a1 = (Array) definedComponents[1].getDataType(); // MyStruct1[2]
+		assertTrue(aDb2_2 == a1);
+		assertEquals("/P1/MyStruct1[2]", a1.getPathName());
+
+		// Array instance should have changed category as well as using MyStruct1[3]
+		Array a1a = (Array) definedComponents[2].getDataType(); // MyStruct1[3][2]
+		assertTrue(aDb2_3_2 == a1a);
+		assertEquals("/P1/MyStruct1[2][3]", a1a.getPathName());
+
+		// Existing MyStruct1[3] array instance should be used and MyStruct2[3] removed
+		Array a1b = (Array) a1a.getDataType(); // MyStruct1[3]
+		assertTrue(aDb1_3 == a1b);
+		assertEquals("/P1/MyStruct1[3]", a1b.getPathName());
+
+		// Structure should get repacked
+		//@formatter:off
+		assertEquals("/P3/MyStruct3\n" + 
+			"pack()\n" + 
+			"Structure MyStruct3 {\n" + 
+			"   0   MyStruct1[3]   3      \"\"\n" + 
+			"   3   MyStruct1[2]   2      \"\"\n" + 
+			"   5   MyStruct1[2][3]   6      \"\"\n" + 
+			"}\n" + 
+			"Size = 11   Actual Alignment = 1\n", sDb3.toString());
+		//@formatter:on
+
+		assertEquals(7, getDataTypeCount()); // include "undefined" type used during resolve
+
+	}
+
+	private int getDataTypeCount() {
+		// NOTE: the DataTypeManager.getAllDataTypes() method will not properly detect duplicate
+		// datatypes if they occur due to the category-based collection which use named-based
+		// maps.
+		int cnt = 0;
+		Iterator<DataType> allDataTypes = dataMgr.getAllDataTypes();
+		while (allDataTypes.hasNext()) {
+			allDataTypes.next();
+			++cnt;
+		}
+
+		// Compare count with actual record count to ensure both proper maps updates and
+		// potential datatype duplication not reflected in count above.
+		assertEquals("Incomplete datatype manager update", cnt, dataMgr.getDataTypeRecordCount());
+
+		return cnt;
+	}
+
+}

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

@@ -0,0 +1,80 @@
+/* ###
+ * IP: GHIDRA
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package ghidra.program.model.data;
+
+import java.util.Arrays;
+
+import org.junit.Test;
+
+import generic.test.AbstractGTest;
+
+public class DataTypeNameComparatorTest extends AbstractGTest {
+
+	@Test
+	public void testDataTypeNameSort() {
+
+		String[] names = new String[] {
+			//@formatter:off
+			"int",
+			"INT",
+			"int *",
+			"INT *",
+			"int [2]",
+			"int * *",
+			"INT_PTR",
+			"s1 *",
+			"S1 *",
+			"S1.conflict",
+			"s1",
+			"S1",
+			"S1.conflict1",
+			"S1.conflict10",
+			"S1.conflict2",
+			"s1.conflict *",
+			"s1.conflict2 *",
+			"s1.conflict10"
+			//@formatter:on
+		};
+
+		String[] sortedNames = new String[] {
+			//@formatter:off
+			"INT",
+			"INT *",
+			"int",
+			"int *",
+			"int * *",
+			"int [2]",
+			"INT_PTR",
+			"S1",
+			"S1 *",
+			"S1.conflict",
+			"S1.conflict1",
+			"S1.conflict2",
+			"S1.conflict10",
+			"s1",
+			"s1 *",
+			"s1.conflict *",
+			"s1.conflict2 *",
+			"s1.conflict10"
+			//@formatter:on
+		};
+
+		Arrays.sort(names, DataTypeNameComparator.INSTANCE);
+
+		assertArraysEqualOrdered("Incorrect datatype name sort order", sortedNames, names);
+	}
+
+}