GP-5074 - CPP PDB vxtable datatype composition

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/ClassFieldAttributes.java

@@ -58,6 +58,8 @@ public class ClassFieldAttributes {
 		};
 		Property myProperty = switch (msAtts.getProperty()) {
 			case VIRTUAL -> Property.VIRTUAL;
+			case INTRO -> Property.VIRTUAL; // VIRTUAL for now; consider change, consider ELF
+			case INTRO_PURE -> Property.VIRTUAL; // VIRTUAL for now; consider change, consider ELF
 			case STATIC -> Property.STATIC;
 			case FRIEND -> Property.FRIEND;
 			case BLANK -> Property.BLANK;

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/ClassTypeManager.java

@@ -17,6 +17,7 @@ package ghidra.app.util.pdb.classtype;
 
 import ghidra.app.util.SymbolPath;
 import ghidra.program.model.data.*;
+import ghidra.program.model.gclass.ClassID;
 
 /**
  * Class Type Manager
@@ -44,10 +45,7 @@ public class ClassTypeManager {
 	}
 
 	public SymbolPath getSymbolPath(ClassID classId) {
-		if (classId instanceof ProgramClassID gId) {
+		return classId.getSymbolPath();
-			return gId.getSymbolPath();
-		}
-		return null;
 	}
 
 	/**

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/MsftVxtManager.java

@@ -25,6 +25,9 @@ import ghidra.app.util.demangler.microsoft.MicrosoftMangledContext;
 import ghidra.app.util.importer.MessageLog;
 import ghidra.program.model.address.Address;
 import ghidra.program.model.data.CategoryPath;
+import ghidra.program.model.data.DataTypeManager;
+import ghidra.program.model.gclass.ClassID;
+import ghidra.program.model.gclass.ClassUtils;
 import ghidra.program.model.listing.Program;
 import ghidra.util.Msg;
 import ghidra.util.exception.AssertException;
@@ -121,8 +124,8 @@ public class MsftVxtManager extends VxtManager {
 	//  memory are the same order that their pointers appear in the classes... this is based solely
 	//  on limited experience.  The solution stinks and would benefit from the original direction
 	//  of using the parentage.  We will try to use the parentage as a litmus test on retrieval
-	private Map<ClassID, TreeMap<Address, VBTable>> vbtsByOwner;
+	private Map<ClassID, TreeMap<Address, VirtualBaseTable>> vbtsByOwner;
-	private Map<ClassID, TreeMap<Address, VFTable>> vftsByOwner;
+	private Map<ClassID, TreeMap<Address, VirtualFunctionTable>> vftsByOwner;
 
 	// Used for locating vft and vbt
 	// These are explicitly used for storing/retrieving the "program" versions which result from
@@ -131,6 +134,9 @@ public class MsftVxtManager extends VxtManager {
 	private ParentageNode vbtRoot;
 	private ParentageNode vftRoot;
 
+	private Map<OwnerParentage, VirtualBaseTable> vbtsByOwnerParentage;
+	private Map<OwnerParentage, VirtualFunctionTable> vftsByOwnerParentage;
+
 	/**
 	 * Constructor for this class
 	 * @param ctm the class type manager
@@ -145,15 +151,32 @@ public class MsftVxtManager extends VxtManager {
 		vftsByOwner = new HashMap<>();
 		vbtRoot = new ParentageNode(null);
 		vftRoot = new ParentageNode(null);
+		vbtsByOwnerParentage = new HashMap<>();
+		vftsByOwnerParentage = new HashMap<>();
 	}
 
 	/**
-	 * Finds the putative {@link VBTable} in memory requested for the owning class
+	 * Create the vxtable structures
+	 * @param dtm the data type manager
+	 */
+	public void doTableLayouts(DataTypeManager dtm) {
+		for (VirtualBaseTable vbt : vbtsByOwnerParentage.values()) {
+			ClassID id = vbt.getOwner();
+			vbt.getLayout(dtm, ClassUtils.getClassInternalsPath(id));
+		}
+		for (VirtualFunctionTable vft : vftsByOwnerParentage.values()) {
+			ClassID id = vft.getOwner();
+			vft.getLayout(dtm, ClassUtils.getClassInternalsPath(id));
+		}
+	}
+
+	/**
+	 * Finds the putative {@link VirtualBaseTable} in memory requested for the owning class
 	 * @param owner the owning class of the table
 	 * @return the table
 	 */
-	public VBTable findPrimaryVbt(ClassID owner) {
+	public VirtualBaseTable findPrimaryVbt(ClassID owner) {
-		TreeMap<Address, VBTable> map = vbtsByOwner.get(owner);
+		TreeMap<Address, VirtualBaseTable> map = vbtsByOwner.get(owner);
 		if (map == null) {
 			return null;
 		}
@@ -161,12 +184,12 @@ public class MsftVxtManager extends VxtManager {
 	}
 
 	/**
-	 * Finds the putative {@link VFTable} in memory requested for the owning class
+	 * Finds the putative {@link VirtualFunctionTable} in memory requested for the owning class
 	 * @param owner the owning class of the table
 	 * @return the table
 	 */
-	public VFTable findPrimaryVft(ClassID owner) {
+	public VirtualFunctionTable findPrimaryVft(ClassID owner) {
-		TreeMap<Address, VFTable> map = vftsByOwner.get(owner);
+		TreeMap<Address, VirtualFunctionTable> map = vftsByOwner.get(owner);
 		if (map == null) {
 			return null;
 		}
@@ -194,35 +217,35 @@ public class MsftVxtManager extends VxtManager {
 	}
 
 	/**
-	 * Returns the ordered in-memory {@link VBTable}s for the owning class
+	 * Returns the ordered in-memory {@link VirtualBaseTable}s for the owning class
 	 * @param owner the owning class of the table
 	 * @return the tables
 	 */
-	public VBTable[] getVbts(ClassID owner) {
+	public VirtualBaseTable[] getVbts(ClassID owner) {
-		TreeMap<Address, VBTable> map = vbtsByOwner.get(owner);
+		TreeMap<Address, VirtualBaseTable> map = vbtsByOwner.get(owner);
 		if (map == null) {
 			return null;
 		}
-		Collection<VBTable> values = map.values();
+		Collection<VirtualBaseTable> values = map.values();
-		return values.toArray(new VBTable[values.size()]);
+		return values.toArray(new VirtualBaseTable[values.size()]);
 	}
 
 	/**
-	 * Returns the ordered in-memory {@link VFTable}s for the owning class
+	 * Returns the ordered in-memory {@link VirtualFunctionTable}s for the owning class
 	 * @param owner the owning class of the table
 	 * @return the tables
 	 */
-	public VFTable[] getVfts(ClassID owner) {
+	public VirtualFunctionTable[] getVfts(ClassID owner) {
-		TreeMap<Address, VFTable> map = vftsByOwner.get(owner);
+		TreeMap<Address, VirtualFunctionTable> map = vftsByOwner.get(owner);
 		if (map == null) {
 			return null;
 		}
-		Collection<VFTable> values = map.values();
+		Collection<VirtualFunctionTable> values = map.values();
-		return values.toArray(new VFTable[values.size()]);
+		return values.toArray(new VirtualFunctionTable[values.size()]);
 	}
 
 	/**
-	 * Finds the putative {@link VBTable} in memory requested for the owning class and the
+	 * Finds the putative {@link VirtualBaseTable} in memory requested for the owning class and the
 	 * specified parentage
 	 * @param owner the owning class of the table
 	 * @param parentage the parentage for the desired table.  The parentage must start with the
@@ -230,12 +253,26 @@ public class MsftVxtManager extends VxtManager {
 	 * that class through all of its decendents to the owner, excluding the owner
 	 * @return the table
 	 */
-	public VBTable findVbt(ClassID owner, List<ClassID> parentage) {
+	public VirtualBaseTable findVbt(ClassID owner, List<ClassID> parentage) {
+		OwnerParentage op = new OwnerParentage(owner, parentage);
+		VirtualBaseTable vbt = vbtsByOwnerParentage.get(op);
+		if (vbt != null) {
+			return vbt;
+		}
+		vbt = searchVbtTree(owner, parentage);
+		if (vbt == null) {
+			vbt = new PlaceholderVirtualBaseTable(owner, parentage);
+		}
+		vbtsByOwnerParentage.put(op, vbt);
+		return vbt;
+	}
+
+	private VirtualBaseTable searchVbtTree(ClassID owner, List<ClassID> parentage) {
 		ParentageNode node = findNode(owner, parentage, vbtRoot);
 		if (node == null) {
 			return null;
 		}
-		VBTable vbTable = node.getVBTable();
+		VirtualBaseTable vbTable = node.getVBTable();
 		if (vbTable != null || !parentage.isEmpty()) { // see note below
 			return vbTable;
 		}
@@ -253,20 +290,35 @@ public class MsftVxtManager extends VxtManager {
 	}
 
 	/**
-	 * Finds the putative {@link VFTable} in memory requested for the owning class and the
+	 * Finds the putative {@link VirtualFunctionTable} in memory requested for the owning class
-	 * specified parentage
+	 * and the specified parentage
 	 * @param owner the owning class of the table
 	 * @param parentage the parentage for the desired table.  The parentage must start with the
 	 * parent that contains the pointer to the table and should include the ordered lineage from
 	 * that class through all of its decendents to the owner, excluding the owner
 	 * @return the table
 	 */
-	public VFTable findVft(ClassID owner, List<ClassID> parentage) {
+	public VirtualFunctionTable findVft(ClassID owner, List<ClassID> parentage) {
+		OwnerParentage op = new OwnerParentage(owner, parentage);
+		VirtualFunctionTable vft = vftsByOwnerParentage.get(op);
+		if (vft != null) {
+			return vft;
+		}
+		vft = searchVftTree(owner, parentage);
+		if (vft == null) {
+			vft = new PlaceholderVirtualFunctionTable(owner, parentage);
+		}
+		vftsByOwnerParentage.put(op, vft);
+		return vft;
+	}
+
+	private VirtualFunctionTable searchVftTree(ClassID owner, List<ClassID> parentage) {
+
 		ParentageNode node = findNode(owner, parentage, vftRoot);
 		if (node == null) {
 			return null;
 		}
-		VFTable vfTable = node.getVFTable();
+		VirtualFunctionTable vfTable = node.getVFTable();
 		if (vfTable != null || !parentage.isEmpty()) { // see note below
 			return vfTable;
 		}
@@ -357,7 +409,8 @@ public class MsftVxtManager extends VxtManager {
 		switch (demanglerResults.vtType()) {
 			case VBT:
 				ProgramVirtualBaseTable prvbt = new ProgramVirtualBaseTable(owner, parentage,
-					program, address, ctm.getDefaultVbtTableElementSize(), ctm, mangled);
+					program, address, ClassUtils.getVbtEntrySize(ctm.getDataTypeManager()),
+					mangled);
 				if (node.getVBTable() != null) {
 					Msg.warn(this, "VBT already exists at node for " + mangled);
 					return false;
@@ -385,8 +438,8 @@ public class MsftVxtManager extends VxtManager {
 		return true;
 	}
 
-	private void storeVbt(ClassID owner, Address address, VBTable vbt) {
+	private void storeVbt(ClassID owner, Address address, VirtualBaseTable vbt) {
-		TreeMap<Address, VBTable> map = vbtsByOwner.get(owner);
+		TreeMap<Address, VirtualBaseTable> map = vbtsByOwner.get(owner);
 		if (map == null) {
 			map = new TreeMap<>();
 			vbtsByOwner.put(owner, map);
@@ -394,8 +447,8 @@ public class MsftVxtManager extends VxtManager {
 		map.put(address, vbt);
 	}
 
-	private void storeVft(ClassID owner, Address address, VFTable vft) {
+	private void storeVft(ClassID owner, Address address, VirtualFunctionTable vft) {
-		TreeMap<Address, VFTable> map = vftsByOwner.get(owner);
+		TreeMap<Address, VirtualFunctionTable> map = vftsByOwner.get(owner);
 		if (map == null) {
 			map = new TreeMap<>();
 			vftsByOwner.put(owner, map);
@@ -404,10 +457,7 @@ public class MsftVxtManager extends VxtManager {
 	}
 
 	private ParentageNode findNode(ClassID owner, List<ClassID> parentage, ParentageNode root) {
-		if (!(owner instanceof ProgramClassID ownerGId)) {
+		SymbolPath ownerSp = owner.getSymbolPath();
-			return null;
-		}
-		SymbolPath ownerSp = ownerGId.getSymbolPath();
 		ParentageNode ownerNode = root.getBranch(ownerSp.toString());
 		if (ownerNode == null) {
 			return null;
@@ -415,10 +465,7 @@ public class MsftVxtManager extends VxtManager {
 		ParentageNode resultNode = null;
 		ParentageNode node = ownerNode;
 		for (ClassID id : parentage) {
-			if (!(id instanceof ProgramClassID gId)) {
+			SymbolPath sp = id.getSymbolPath();
-				return null;
-			}
-			SymbolPath sp = gId.getSymbolPath();
 			ParentageNode next = node.getBranch(sp.toString());
 			if (next != null) {
 				node = next;
@@ -445,19 +492,9 @@ public class MsftVxtManager extends VxtManager {
 
 		ClassID owner = ownerAndParentage.owner(); // owner should be same as first on list
 		List<ClassID> parentage = ownerAndParentage.parentage();
-		if (!(owner instanceof ProgramClassID)) {
+		node = node.getOrAddBranch(owner.getSymbolPath().toString());
-			Msg.error(this, "ClassID error for " + ownerAndParentage);
-			return null;
-		}
-		ProgramClassID gId = (ProgramClassID) owner;
-		node = node.getOrAddBranch(gId.getSymbolPath().toString());
 		for (ClassID id : parentage) {
-			if (!(id instanceof ProgramClassID)) {
+			node = node.getOrAddBranch(id.getSymbolPath().toString());
-				Msg.error(this, "ClassID error for " + ownerAndParentage);
-				return null;
-			}
-			gId = (ProgramClassID) id;
-			node = node.getOrAddBranch(gId.getSymbolPath().toString());
 		}
 		return node;
 	}
@@ -511,9 +548,9 @@ public class MsftVxtManager extends VxtManager {
 		List<SymbolPath> parentageSps = getParentageSymbolPaths(vxTable.getNestedQualifications());
 
 		List<ClassID> parentage = new ArrayList<>();
-		ClassID owner = new ProgramClassID(categoryPath, ownerSp);
+		ClassID owner = new ClassID(categoryPath, ownerSp);
 		for (SymbolPath sp : parentageSps) {
-			ClassID user = new ProgramClassID(categoryPath, sp);
+			ClassID user = new ClassID(categoryPath, sp);
 			parentage.add(user); // owner is the parentage if parentageSps was empty
 		}
 
@@ -560,8 +597,8 @@ public class MsftVxtManager extends VxtManager {
 		private String name;
 		// Might want to store more than just one VXT... could store generic, pdb, program
 		//  versions... could mix function and base too (one tree instead of two)?
-		private VFTable vft;
+		private VirtualFunctionTable vft;
-		private VBTable vbt;
+		private VirtualBaseTable vbt;
 
 		private ParentageNode(String name) {
 			this.name = name;
@@ -582,19 +619,19 @@ public class MsftVxtManager extends VxtManager {
 			return branches.get(branchName);
 		}
 
-		private void setVFTable(VFTable vftArg) {
+		private void setVFTable(VirtualFunctionTable vftArg) {
 			vft = vftArg;
 		}
 
-		private void setVBTable(VBTable vbtArg) {
+		private void setVBTable(VirtualBaseTable vbtArg) {
 			vbt = vbtArg;
 		}
 
-		private VFTable getVFTable() {
+		private VirtualFunctionTable getVFTable() {
 			return vft;
 		}
 
-		private VBTable getVBTable() {
+		private VirtualBaseTable getVBTable() {
 			return vbt;
 		}
 

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/OwnerParentage.java

@@ -15,17 +15,13 @@
  */
 package ghidra.app.util.pdb.classtype;
 
+import java.util.List;
+
+import ghidra.program.model.gclass.ClassID;
+
 /**
- * Unique ID of a ClassType.  Not sure if there will be different implementation for definition
+ * Owner-Parentage combination for identifying a vxtable, its pointer, or a base class
- *  vs. compiled vs. program vs. debug.  Need to come to grips with this
+ * @param owner the owning class
+ * @param parentage the parentage of the base class or vxtable or vxtable pointer
  */
-public interface ClassID extends Comparable<ClassID> {
+public record OwnerParentage(ClassID owner, List<ClassID> parentage) {}
-
-	// For compareTo() method of classes in this hierarchy (for Comparable<ClassID>)
-	/**
-	 * For internal use
-	 * @return hash of java class in ClassID hierarchy
-	 */
-	public int getClassNameHash();
-
-}

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/PlaceholderVirtualBaseTable.java

@@ -15,110 +15,76 @@
  */
 package ghidra.app.util.pdb.classtype;
 
-import java.util.*;
+import java.util.List;
 
 import ghidra.app.util.bin.format.pdb2.pdbreader.PdbException;
+import ghidra.program.model.gclass.ClassID;
 
 /**
  * Virtual Base Table without a program
  */
 public class PlaceholderVirtualBaseTable extends VirtualBaseTable {
 
-	private int entrySize;
-
-	private int maxIndexSeen = -1;
-	private Map<Integer, VBTableEntry> entriesByIndex = new HashMap<>();
-
 	/**
 	 * Constructor
 	 * @param owner the class that owns the table
 	 * @param parentage the parentage of the base class(es) of the table
-	 * @param entrySize the size of the index field for each table entry as it would be in memory
 	 */
-	public PlaceholderVirtualBaseTable(ClassID owner, List<ClassID> parentage, int entrySize) {
+	public PlaceholderVirtualBaseTable(ClassID owner, List<ClassID> parentage) {
 		super(owner, parentage);
-		if (entrySize != 4 && entrySize != 8) {
-			throw new IllegalArgumentException("Invalid size (" + entrySize + "): must be 4 or 8.");
-		}
-		this.entrySize = entrySize;
 	}
 
-	/*
+	public void setBaseClassOffsetAndId(int tableIndex, Long offset, ClassID baseId) {
-	 * For the next method below... once we determine the number of virtual bases (virtual and
+		PlaceholderVirtualBaseTableEntry entry = entry(tableIndex);
-	 * indirect virtual) for each class (from PDB or other), we can determine the number of
-	 * entries in each VBT.  For a VBT for the main class, the number is equal... if for some
-	 * parentage, then the number can reflect the number of the parent.
-	 * TODO: can VBT overlay/extend one from parent????????????????????????????????????????????
-	 */
-	/**
-	 * TBD: need to determine table size to do this.  Might want to place a symbol (diff method?).
-	 */
-	void createTableDataType(int numEntries) {
-
-	}
-
-	int getMaxIndex() {
-		return maxIndexSeen;
-	}
-
-	public void setBaseClassOffsetAndId(int index, Long offset, ClassID baseId) {
-		VBTableEntry entry = entriesByIndex.get(index);
 		if (entry == null) {
-			entry = new VirtualBaseTableEntry(offset, baseId);
+			entry = new PlaceholderVirtualBaseTableEntry(offset, baseId);
-			entriesByIndex.put(index, entry);
+			entryByTableIndex.put(tableIndex, entry);
+			maxTableIndexSeen = Integer.max(maxTableIndexSeen, tableIndex);
 		}
 		else {
 			entry.setOffset(offset);
 			entry.setClassId(baseId);
 		}
-		maxIndexSeen = Integer.max(maxIndexSeen, index);
 	}
 
-	public void setBaseClassId(int index, ClassID baseId) {
+	public void setBaseOffset(int tableIndex, Long offset) {
-		VBTableEntry entry = entriesByIndex.get(index);
+		PlaceholderVirtualBaseTableEntry entry = entry(tableIndex);
 		if (entry == null) {
-			entry = new VirtualBaseTableEntry(baseId);
+			entry = new PlaceholderVirtualBaseTableEntry(offset);
-			entriesByIndex.put(index, entry);
+			entryByTableIndex.put(tableIndex, entry);
-		}
+			maxTableIndexSeen = Integer.max(maxTableIndexSeen, tableIndex);
-		else {
-			entry.setClassId(baseId);
-		}
-		maxIndexSeen = Integer.max(maxIndexSeen, index);
-	}
-
-	public void setBaseOffset(int index, Long offset) {
-		VBTableEntry entry = entriesByIndex.get(index);
-		if (entry == null) {
-			entry = new VirtualBaseTableEntry(offset);
-			entriesByIndex.put(index, entry);
 		}
 		else {
 			entry.setOffset(offset);
 		}
-		maxIndexSeen = Integer.max(maxIndexSeen, index);
 	}
 
 	@Override
-	public Long getBaseOffset(int index) throws PdbException {
+	public PlaceholderVirtualBaseTableEntry getEntry(int tableIndex) {
-		VBTableEntry entry = entriesByIndex.get(index);
+		return (PlaceholderVirtualBaseTableEntry) entryByTableIndex.get(tableIndex);
+	}
+
+	@Override
+	public Long getBaseOffset(int tableIndex) throws PdbException {
+		PlaceholderVirtualBaseTableEntry entry = entry(tableIndex);
 		Long offset = (entry == null) ? null : entry.getOffset();
-		maxIndexSeen = Integer.max(maxIndexSeen, index);
 		return offset;
 	}
 
 	@Override
-	public ClassID getBaseClassId(int index) {
+	protected PlaceholderVirtualBaseTableEntry getNewEntry(ClassID baseId) {
-		VBTableEntry entry = entriesByIndex.get(index);
+		return new PlaceholderVirtualBaseTableEntry(baseId);
-		ClassID id = (entry == null) ? null : entry.getClassId();
-		maxIndexSeen = Integer.max(maxIndexSeen, index);
-		return id;
 	}
 
-	@Override
+	private PlaceholderVirtualBaseTableEntry entry(int tableIndex) {
-	public VBTableEntry getBase(int index) throws PdbException {
+		return (PlaceholderVirtualBaseTableEntry) entryByTableIndex.get(tableIndex);
-		VBTableEntry entry = entriesByIndex.get(index);
+	}
-		if (entry != null) {
+
-			maxIndexSeen = Integer.max(maxIndexSeen, index);
+	private PlaceholderVirtualBaseTableEntry existing(int tableIndex) throws PdbException {
+		PlaceholderVirtualBaseTableEntry entry = entry(tableIndex);
+		if (entry == null) {
+			throw new PdbException(
+				"No entry in Virtual Base Table for table index: " + tableIndex);
 		}
 		return entry;
 	}

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/PlaceholderVirtualBaseTableEntry.java

@@ -0,0 +1,68 @@
+/* ###
+ * 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.app.util.pdb.classtype;
+
+import ghidra.program.model.gclass.ClassID;
+
+/**
+ * Represents the Entry for a Virtual Base Table
+ */
+public class PlaceholderVirtualBaseTableEntry extends VirtualBaseTableEntry {
+	private Long offset;
+
+	// Re-evaluate which constructors and setters we need
+
+	public PlaceholderVirtualBaseTableEntry(Long offset) {
+		this(offset, null);
+	}
+
+	public PlaceholderVirtualBaseTableEntry(ClassID baseId) {
+		this(null, baseId);
+	}
+
+	public PlaceholderVirtualBaseTableEntry(Long offset, ClassID baseId) {
+		super(baseId);
+		this.offset = offset;
+	}
+
+	public void setOffset(Long offset) {
+		this.offset = offset;
+	}
+
+	public Long getOffset() {
+		return offset;
+	}
+
+	//==============================================================================================
+	// Info from longer-running branch
+
+	void emit(StringBuilder builder, long vbtPtrOffset) {
+//		emitLine(builder, offset, vbtPtrOffset,
+//			getClassId(compiledBaseClass, baseClassComponent).toString());
+		emitLine(builder, getOffset(), vbtPtrOffset, getClassId().toString());
+	}
+
+	static void emitHeader(StringBuilder builder, long ownerOffset, long vbtPtrOffset) {
+		builder.append(String.format("%-10s %-10s %-10s\n", "OffInOwner", "OffFromPtr", "Base"));
+		emitLine(builder, ownerOffset, vbtPtrOffset, "'ForClass'");
+	}
+
+	static void emitLine(StringBuilder builder, long classOffset, long vbtPtrOffset, String owner) {
+		builder.append(
+			String.format("%-10d %-10d %-10s\n", classOffset, classOffset - vbtPtrOffset, owner));
+	}
+
+}

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/PlaceholderVirtualFunctionTable.java

@@ -0,0 +1,93 @@
+/* ###
+ * 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.app.util.pdb.classtype;
+
+import java.util.List;
+
+import ghidra.app.util.SymbolPath;
+import ghidra.app.util.bin.format.pdb2.pdbreader.PdbException;
+import ghidra.program.model.address.Address;
+import ghidra.program.model.data.Pointer;
+import ghidra.program.model.gclass.ClassID;
+
+public class PlaceholderVirtualFunctionTable extends VirtualFunctionTable {
+
+	/**
+	 * Constructor.
+	 * Virtual Function Table for a base (parent) class within an owner class.  The owner and parent
+	 * class can be null if not known, but methods are offered to fill them in if/when this
+	 * information becomes available
+	 * @param owner class that owns this VBT (can own more than one); can be {@code null}
+	 * @param parentage parentage for which this VFT is used; can be {@code null}
+	 */
+	public PlaceholderVirtualFunctionTable(ClassID owner, List<ClassID> parentage) {
+		super(owner, parentage);
+	}
+
+	public void setAddress(int tableIndex, Address address) throws PdbException {
+		PlaceholderVirtualFunctionTableEntry entry = existing(tableIndex);
+		entry.setAddress(address);
+	}
+
+	@Override
+	public Address getAddress(int tableIndex) throws PdbException {
+		PlaceholderVirtualFunctionTableEntry entry = existing(tableIndex);
+		return entry.getAddress();
+	}
+
+	@Override
+	protected VirtualFunctionTableEntry getNewEntry(SymbolPath originalMethodPath,
+			SymbolPath overrideMethodPath, Pointer functionPointer) {
+		return new PlaceholderVirtualFunctionTableEntry(originalMethodPath, overrideMethodPath,
+			functionPointer);
+	}
+
+	@Override
+	public void emit(StringBuilder builder) {
+		builder.append(
+			"Placeholder VFT for the following classes within owner:\n   " + owner + "\n");
+		builder.append(String.format("For Classes:\n"));
+		for (ClassID id : parentage) {
+			builder.append(String.format("   %-10s\n", id.toString()));
+		}
+		builder.append("VftPtrOffset within Owner" + ptrOffsetInClass + "\n");
+		PlaceholderVirtualFunctionTableEntry.emitHeader(builder);
+		for (int tableIndex : entriesByTableIndex.keySet()) {
+			entry(tableIndex).emit(builder, ptrOffsetInClass);
+		}
+	}
+
+	@Override
+	public String toString() {
+		StringBuilder builder = new StringBuilder();
+		emit(builder);
+		return builder.toString();
+	}
+
+	private PlaceholderVirtualFunctionTableEntry entry(int tableIndex) {
+		return (PlaceholderVirtualFunctionTableEntry) entriesByTableIndex.get(tableIndex);
+	}
+
+	private PlaceholderVirtualFunctionTableEntry existing(int tableIndex) throws PdbException {
+		PlaceholderVirtualFunctionTableEntry entry = entry(tableIndex);
+		if (entry == null) {
+			throw new PdbException(
+				"No entry in Virtual Function Table for table offset: " + tableIndex);
+		}
+		return entry;
+	}
+
+}

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/PlaceholderVirtualFunctionTableEntry.java

@@ -0,0 +1,84 @@
+/* ###
+ * 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.app.util.pdb.classtype;
+
+import ghidra.app.util.SymbolPath;
+import ghidra.program.model.address.Address;
+import ghidra.program.model.data.Pointer;
+
+class PlaceholderVirtualFunctionTableEntry extends VirtualFunctionTableEntry {
+	private Address address;
+
+	/**
+	 * Constructor for placeholder virtual function table entry
+	 * @param originalMethodPath the path of the original function
+	 * @param overrideMethodPath the path of the overriding function
+	 * @param functionPointer the pointer to the function definition
+	 */
+	PlaceholderVirtualFunctionTableEntry(SymbolPath originalMethodPath,
+			SymbolPath overrideMethodPath, Pointer functionPointer) {
+		this(originalMethodPath, overrideMethodPath, functionPointer, null);
+	}
+
+	/**
+	 * Constructor for placeholder virtual function table entry
+	 * @param originalMethodPath the path of the original function
+	 * @param overrideMethodPath the path of the overriding function
+	 * @param functionPointer the pointer to the function definition
+	 * @param address address of the function in memory; can be {@code null}
+	 */
+	PlaceholderVirtualFunctionTableEntry(SymbolPath originalMethodPath,
+			SymbolPath overrideMethodPath, Pointer functionPointer, Address address) {
+		super(originalMethodPath, overrideMethodPath, functionPointer);
+		this.address = address;
+	}
+
+	/**
+	 * Method to set the address of the function in memory
+	 * @param address the address
+	 */
+	void setAddress(Address address) {
+		this.address = address;
+	}
+
+	/**
+	 * Returns the address of the function in memory, if set
+	 * @return the address; can be {@code null}
+	 */
+	Address getAddress() {
+		return address;
+	}
+
+	//==============================================================================================
+	// Info from longer-running branch
+
+	void emit(StringBuilder builder, long vbtPtrOffset) {
+		emitLine(builder, null, overrideMethodPath);
+	}
+
+//	static void emitHeader(StringBuilder builder, long ownerOffset, long vbtPtrOffset) {
+	static void emitHeader(StringBuilder builder) {
+		builder.append(String.format("%16s %s\n", "Address", "Path"));
+		// TODO: see if we need something like this for PlaceholderVirtualFunctionTable
+//		emitLine(builder, ownerOffset, vbtPtrOffset );
+	}
+
+	static void emitLine(StringBuilder builder, Address address, SymbolPath path) {
+		builder.append(String.format("%16s %10s\n",
+			address == null ? "<unk_addr>" : address.toString(), path.toString()));
+	}
+
+}

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/ProgramVirtualBaseTable.java

@@ -15,10 +15,11 @@
  */
 package ghidra.app.util.pdb.classtype;
 
-import java.util.*;
+import java.util.List;
 
 import ghidra.app.util.bin.format.pdb2.pdbreader.PdbException;
 import ghidra.program.model.address.Address;
+import ghidra.program.model.gclass.ClassID;
 import ghidra.program.model.listing.Program;
 import ghidra.program.model.mem.Memory;
 import ghidra.program.model.mem.MemoryAccessException;
@@ -33,12 +34,6 @@ public class ProgramVirtualBaseTable extends VirtualBaseTable {
 	private int entrySize;
 	private String mangledName; // remove?
 
-	private Boolean createdFromMemory = null;
-	private Boolean createdFromCompiled = null;
-
-	private int maxIndexSeen = -1;
-	private Map<Integer, VBTableEntry> entriesByIndex = new HashMap<>();
-
 	/**
 	 * Constructor
 	 * @param owner the class that owns the table
@@ -46,20 +41,15 @@ public class ProgramVirtualBaseTable extends VirtualBaseTable {
 	 * @param program the program
 	 * @param address the address of the table
 	 * @param entrySize the size of the index field for each table entry in memory
-	 * @param ctm the class type manager
 	 * @param mangledName the mangled name of the table
 	 */
 	public ProgramVirtualBaseTable(ClassID owner, List<ClassID> parentage, Program program,
-			Address address, int entrySize, ClassTypeManager ctm, String mangledName) {
+			Address address, int entrySize, String mangledName) {
 		super(owner, parentage);
-		if (entrySize != 4 && entrySize != 8) {
-			throw new IllegalArgumentException("Invalid size (" + entrySize + "): must be 4 or 8.");
-		}
 		this.program = program;
 		this.address = address;
 		this.entrySize = entrySize;
 		this.mangledName = mangledName;
-		createdFromMemory = true;
 	}
 
 	/**
@@ -78,27 +68,25 @@ public class ProgramVirtualBaseTable extends VirtualBaseTable {
 		return mangledName;
 	}
 
-	/*
-	 * For the next method below... once we determine the number of virtual bases (virtual and
-	 * indirect virtual) for each class (from PDB or other), we can determine the number of
-	 * entries in each VBT.  For a VBT for the main class, the number is equal... if for some
-	 * parentage, then the number can reflect the number of the parent.  TODO: can VBT overlay/extend one from parent????????????????????????????????????????????
-	 */
-	/**
-	 * TBD: need to determine table size to do this.  Might want to place a symbol (diff method?).
-	 */
-	void placeTableDataType(int numEntries) {
-
-	}
-
-	int getMaxIndex() {
-		return maxIndexSeen;
-	}
-
 	@Override
-	public Long getBaseOffset(int index) throws PdbException {
+	public Long getBaseOffset(int tableIndex) throws PdbException {
+		Long offset = baseOffsetByTableIndex.get(tableIndex);
+		if (offset != null) {
+			return offset;
+		}
+		offset = getOffsetFromMemory(tableIndex);
+		if (offset != null) {
+			baseOffsetByTableIndex.put(tableIndex, offset);
+		}
+		return offset;
+	}
+
+	private Long getOffsetFromMemory(int tableIndex) throws PdbException {
+		if (program == null || address == null) {
+			return null;
+		}
 		Memory memory = program.getMemory();
-		Address entryAddress = address.add(index * entrySize);
+		Address entryAddress = address.add(tableIndex * entrySize);
 		try {
 			Long offset = (entrySize == 4) ? (long) memory.getInt(entryAddress)
 					: memory.getLong(entryAddress);
@@ -110,40 +98,31 @@ public class ProgramVirtualBaseTable extends VirtualBaseTable {
 					entryAddress);
 		}
 		finally {
-			maxIndexSeen = Integer.max(maxIndexSeen, index);
+			maxTableIndexSeen = Integer.max(maxTableIndexSeen, tableIndex);
 		}
 	}
 
 	@Override
-	public ClassID getBaseClassId(int index) throws PdbException {
+	protected VirtualBaseTableEntry getNewEntry(ClassID baseId) {
-		VBTableEntry entry = entriesByIndex.get(index);
+		return new VirtualBaseTableEntry(baseId);
-		if (entry == null) {
-			throw new PdbException("No entry in Virtual Base Table for index: " + index);
-		}
-		maxIndexSeen = Integer.max(maxIndexSeen, index);
-		return entry.getClassId();
 	}
 
-	@Override
+	/**
-	public VBTableEntry getBase(int index) throws PdbException {
+	 * Returns the entry for the table index; the table index is based at 1
-		VBTableEntry entry = entriesByIndex.get(index);
+	 * @param tableIndex the index location in the table
-		if (entry == null) {
+	 * @return the entry
-			throw new PdbException("No entry in Virtual Base Table for index: " + index);
+	 */
+	private VirtualBaseTableEntry entry(int tableIndex) {
+		return entryByTableIndex.get(tableIndex);
+	}
+
+	private VirtualBaseTableEntry existing(int tableIndex) throws PdbException {
+		VirtualBaseTableEntry entry = entry(tableIndex);
+		if (entry == null) {
+			throw new PdbException(
+				"No entry in Virtual Base Table for table offset: " + tableIndex);
 		}
-		maxIndexSeen = Integer.max(maxIndexSeen, index);
 		return entry;
 	}
 
-	public void setBaseClassId(int index, ClassID baseId) {
-		VBTableEntry entry = entriesByIndex.get(index);
-		if (entry == null) {
-			entry = new VirtualBaseTableEntry(baseId);
-			entriesByIndex.put(index, entry);
-		}
-		else {
-			entry.setClassId(baseId);
-		}
-		maxIndexSeen = Integer.max(maxIndexSeen, index);
-	}
-
 }

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/ProgramVirtualFunctionTable.java

@@ -16,10 +16,13 @@
 package ghidra.app.util.pdb.classtype;
 
 import java.util.List;
+import java.util.TreeMap;
 
 import ghidra.app.util.SymbolPath;
 import ghidra.app.util.bin.format.pdb2.pdbreader.PdbException;
 import ghidra.program.model.address.Address;
+import ghidra.program.model.data.Pointer;
+import ghidra.program.model.gclass.ClassID;
 import ghidra.program.model.listing.Program;
 import ghidra.program.model.mem.Memory;
 import ghidra.program.model.mem.MemoryAccessException;
@@ -54,6 +57,7 @@ public class ProgramVirtualFunctionTable extends VirtualFunctionTable {
 		this.address = address;
 		this.defaultEntrySize = defaultEntrySize;
 		this.mangledName = mangledName;
+		entriesByTableIndex = new TreeMap<>();
 	}
 
 	/**
@@ -72,6 +76,13 @@ public class ProgramVirtualFunctionTable extends VirtualFunctionTable {
 		return mangledName;
 	}
 
+	@Override
+	protected VirtualFunctionTableEntry getNewEntry(SymbolPath originalMethodPath,
+			SymbolPath overrideMethodPath, Pointer functionPointer) {
+		return new VirtualFunctionTableEntry(originalMethodPath, overrideMethodPath,
+			functionPointer);
+	}
+
 	@Override
 	public Address getAddress(int ordinal) throws PdbException {
 		Memory memory = program.getMemory();
@@ -91,11 +102,19 @@ public class ProgramVirtualFunctionTable extends VirtualFunctionTable {
 				"MemoryAccessException while trying to parse virtual function table entry at address: " +
 					entryAddress);
 		}
-		//throw new UnsupportedOperationException();
 	}
 
-	@Override
+	private VirtualFunctionTableEntry entry(int tableIndex) {
-	public SymbolPath getPath(int index) throws PdbException {
+		return (VirtualFunctionTableEntry) entriesByTableIndex.get(tableIndex);
-		throw new UnsupportedOperationException();
 	}
+
+	private VirtualFunctionTableEntry existing(int tableIndex) throws PdbException {
+		VirtualFunctionTableEntry entry = entry(tableIndex);
+		if (entry == null) {
+			throw new PdbException(
+				"No entry in Virtual Function Table for table offset: " + tableIndex);
+		}
+		return entry;
+	}
+
 }

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/VBTable.java

@@ -18,6 +18,6 @@ package ghidra.app.util.pdb.classtype;
 /**
  * Compiler-generated virtual base table
  */
-public interface VBTable {
+public interface VBTable extends VXT {
 	// empty for now
 }

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/VBTableEntry.java

@@ -15,22 +15,12 @@
  */
 package ghidra.app.util.pdb.classtype;
 
+import ghidra.program.model.gclass.ClassID;
+
 /**
  * Represents an entry within a virtual base table
  */
-public interface VBTableEntry {
+public interface VBTableEntry extends VXTEntry {
-
-	/**
-	 * Sets the entry offset value
-	 * @param offset the offset
-	 */
-	public void setOffset(Long offset);
-
-	/**
-	 * Gets the entry offset value
-	 * @return the offset value
-	 */
-	public Long getOffset();
 
 	/**
 	 * Sets the entry class ID

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/VFTable.java

@@ -18,6 +18,6 @@ package ghidra.app.util.pdb.classtype;
 /**
  * Compiler-generated virtual function table
  */
-public interface VFTable {
+public interface VFTable extends VXT {
 	// empty for now
 }

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/VFTableEntry.java

@@ -0,0 +1,62 @@
+/* ###
+ * 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.app.util.pdb.classtype;
+
+import ghidra.app.util.SymbolPath;
+import ghidra.program.model.data.Pointer;
+
+/**
+ * Represents an entry within a virtual function table
+ */
+public interface VFTableEntry extends VXTEntry {
+
+	/**
+	 * Sets the original path of the function
+	 * @param path the symbol path
+	 */
+	public void setOriginalPath(SymbolPath path);
+
+	/**
+	 * Gets the original path of the function
+	 * @return the symbol path
+	 */
+	public SymbolPath getOriginalPath();
+
+	/**
+	 * Sets the override path of the function
+	 * @param path the symbol path
+	 */
+	public void setOverridePath(SymbolPath path);
+
+	/**
+	 * Gets the override path of the function
+	 * @return the symbol path
+	 */
+	public SymbolPath getOverridePath();
+
+	/**
+	 * Sets the pointer to the function definition type
+	 * @param pointer the pointer to the funciton definition type
+	 */
+	public void setFunctionPointer(Pointer pointer);
+
+	/**
+	 * Returns the pointer to the function definition type
+	 * @return the pointer to the function definition type
+	 */
+	public Pointer getFunctionPointer();
+
+}

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/VXT.java

@@ -0,0 +1,23 @@
+/* ###
+ * 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.app.util.pdb.classtype;
+
+/**
+ * Compiler-generated virtual "something" table -- generic v-anything-table from any toolchain
+ */
+public interface VXT {
+	// empty for now
+}

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/VXTEntry.java

@@ -0,0 +1,23 @@
+/* ###
+ * 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.app.util.pdb.classtype;
+
+/**
+ * Compiler-generated virtual "something" table entry -- generic v-anything-table entry
+ */
+public interface VXTEntry {
+	// empty for now
+}

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/VirtualBaseTable.java

@@ -15,10 +15,12 @@
  */
 package ghidra.app.util.pdb.classtype;
 
-import java.util.ArrayList;
+import java.util.*;
-import java.util.List;
 
 import ghidra.app.util.bin.format.pdb2.pdbreader.PdbException;
+import ghidra.program.model.data.*;
+import ghidra.program.model.gclass.ClassID;
+import ghidra.program.model.gclass.ClassUtils;
 
 /**
  * Abstract class for virtual base tables
@@ -28,15 +30,23 @@ public abstract class VirtualBaseTable implements VBTable {
 	protected ClassID owner; // Does this belong here in this abstract class?
 	protected List<ClassID> parentage; // Not sure this belongs in this abstract class
 	/**
-	 * The number of entries in the table
+	 * The number of entries in the table, as specified by the user
 	 */
-	protected Integer numEntries;
+	protected Integer userSpecifiedNumEntries;
 	/**
 	 * This is the offset within the class where we expect to find the pointer that can point to
 	 *  this table
 	 */
 	protected Long ptrOffsetInClass;
 
+	protected int maxTableIndexSeen;
+	protected Map<Integer, VirtualBaseTableEntry> entryByTableIndex;
+	protected Map<Integer, Long> baseOffsetByTableIndex;
+
+	// result of compile/build
+	private Structure tableStructure;
+	private boolean isBuilt;
+
 	/**
 	 * Virtual Base Table for a base (parent) class within an owner class.  The owner and parent
 	 * class can be null if not known, but methods are offered to fill them in if/when this
@@ -47,35 +57,82 @@ public abstract class VirtualBaseTable implements VBTable {
 	public VirtualBaseTable(ClassID owner, List<ClassID> parentage) {
 		this.owner = owner;
 		this.parentage = new ArrayList<>(parentage);
+		maxTableIndexSeen = -1;
+		entryByTableIndex = new HashMap<>();
+		baseOffsetByTableIndex = new HashMap<>();
+	}
+
+	protected abstract VirtualBaseTableEntry getNewEntry(ClassID baseId);
+
+	/**
+	 * Method to add an entry to the virtual base table
+	 * @param tableIndex the index location in the virtual base table for the entry
+	 * @param baseId class id of the base
+	 */
+	public void addEntry(int tableIndex, ClassID baseId) {
+		VirtualBaseTableEntry entry = getNewEntry(baseId);
+		entryByTableIndex.put(tableIndex, entry);
+		maxTableIndexSeen = Integer.max(maxTableIndexSeen, tableIndex);
+	}
+
+	int getMaxTableIndex() {
+		return maxTableIndexSeen;
+	}
+
+	public Map<Integer, VirtualBaseTableEntry> getEntriesByTableIndex() {
+		return entryByTableIndex;
+	}
+
+	/**
+	 * Returns the base class entry for the table tableIndex
+	 * @param tableIndex the index location in the virtual base table for the entry
+	 * @return the entry for the base class
+	 */
+	public VBTableEntry getEntry(int tableIndex) {
+		return entryByTableIndex.get(tableIndex);
 	}
 
 	/**
 	 * Returns the offset of the base class in the layout class pertaining whose entry in the
-	 * VBTable is at the index location
+	 * VBTable is at the tableIndex location
-	 * VBTable
+	 * @param tableIndex the index location in the virtual base table for the entry
-	 * @param index the index in the table
 	 * @return the offset in the layout class
 	 * @throws PdbException if problem retrieving the offset value
 	 */
-	public abstract Long getBaseOffset(int index) throws PdbException;
+	public abstract Long getBaseOffset(int tableIndex) throws PdbException;
+
+	/**
+	 * Sets the base class id for the table index; the table index is based at 1
+	 * @param tableIndex the index location in the table
+	 * @param baseId the base class id
+	 */
+	public void setBaseClassId(int tableIndex, ClassID baseId) {
+		VirtualBaseTableEntry entry = entryByTableIndex.get(tableIndex);
+		if (entry == null) {
+			entry = new VirtualBaseTableEntry(baseId);
+			entryByTableIndex.put(tableIndex, entry);
+		}
+		else {
+			entry.setClassId(baseId);
+		}
+		maxTableIndexSeen = Integer.max(maxTableIndexSeen, tableIndex);
+	}
 
 	/**
 	 * Returns the ClassID of the base class in the layout class pertaining whose entry in the
-	 * VBTable is at the index location
+	 * VBTable is at the tableIndex location; the table index is based at 1
-	 * @param index the index in the table
+	 * @param tableIndex the index location in the virtual base table for the entry
 	 * @return the ClassID of the base class
-	 * @throws PdbException if an entry does not exist for the index
+	 * @throws PdbException if an entry does not exist for the tableIndex
 	 */
-	public abstract ClassID getBaseClassId(int index) throws PdbException;
+	public ClassID getBaseClassId(int tableIndex) throws PdbException {
-
+		VBTableEntry entry = entryByTableIndex.get(tableIndex);
-	/**
+		if (entry == null) {
-	 * Returns a {@link VBTableEntry} for the base class in the layout class pertaining whose
+			return null;
-	 * entry in the VBTable is at the index location
+		}
-	 * @param index the index in the table
+		maxTableIndexSeen = Integer.max(maxTableIndexSeen, tableIndex);
-	 * @return the ClassID of the base class
+		return entry.getClassId();
-	 * @throws PdbException if an entry does not exist for the index
+	}
-	 */
-	public abstract VBTableEntry getBase(int index) throws PdbException;
 
 	/**
 	 * Returns the owning class
@@ -95,10 +152,18 @@ public abstract class VirtualBaseTable implements VBTable {
 
 	/**
 	 * Returns the number of entries in the table
-	 * @return the number of entries; {@code null} if not initialized
+	 * @return the number of entries
 	 */
-	public Integer getNumEntries() {
+	public int getNumEntries() {
-		return numEntries;
+		return entryByTableIndex.size();
+	}
+
+	/**
+	 * Returns the number of entries in the table, as specified by the user
+	 * @return the number of entries
+	 */
+	public int getUserSpecifiedNumEntries() {
+		return userSpecifiedNumEntries;
 	}
 
 	/**
@@ -130,7 +195,7 @@ public abstract class VirtualBaseTable implements VBTable {
 	 * @param numEntriesArg the number of entries
 	 */
 	public void setNumEntries(Integer numEntriesArg) {
-		numEntries = numEntriesArg;
+		userSpecifiedNumEntries = numEntriesArg;
 	}
 
 	/**
@@ -150,4 +215,56 @@ public abstract class VirtualBaseTable implements VBTable {
 		}
 	}
 
+	/**
+	 * Returns the built data type for this vftable for the current entries
+	 * @param dtm the data type manager
+	 * @param categoryPath category path for the table
+	 * @return the structure of the vftable
+	 */
+	public Structure getLayout(DataTypeManager dtm, CategoryPath categoryPath) {
+		if (!isBuilt) { // what if we want to rebuild... what should we do?
+			build(dtm, categoryPath);
+		}
+		return tableStructure;
+	}
+
+	private void build(DataTypeManager dtm, CategoryPath categoryPath) {
+		if (ptrOffsetInClass == null || maxTableIndexSeen == -1) {
+			tableStructure = null;
+			isBuilt = true;
+			return;
+		}
+		String name = ClassUtils.getSpecialVxTableName(ptrOffsetInClass);
+		DataType defaultEntry = ClassUtils.getVbtDefaultEntry(dtm);
+		// Holding onto next line for now
+		//int entrySize = defaultEntry.getLength();
+		// Note that maxTableIndexSeen comes from addEntry() and those have what seems to be
+		//  a base 1 "index" (vs. base 0 vs. offset)
+		int tableNumEntries =
+			(userSpecifiedNumEntries != null) ? userSpecifiedNumEntries : maxTableIndexSeen;
+		// Holding onto next line for now
+		//int tableSize = tableNumEntries * entrySize;
+		StructureDataType dt = new StructureDataType(categoryPath, name, 0, dtm);
+		int masterOrdinal = 0;
+		for (Map.Entry<Integer, VirtualBaseTableEntry> mapEntry : entryByTableIndex.entrySet()) {
+			// Note that entrie's tableIndex is based at 1 instead of 0
+			int ordinal = mapEntry.getKey() - 1;
+			VBTableEntry entry = mapEntry.getValue();
+			while (masterOrdinal < ordinal) {
+				dt.add(defaultEntry, "", "");
+				masterOrdinal++;
+			}
+			String comment = entry.getClassId().getSymbolPath().toString();
+			dt.add(defaultEntry, "", comment); // we could add a comment here
+			masterOrdinal++;
+		}
+		while (masterOrdinal < tableNumEntries) {
+			dt.add(defaultEntry, "", "");
+			masterOrdinal++;
+		}
+		tableStructure = (Structure) dtm.resolve(dt, null);
+		//System.out.println(tableStructure.toString());
+		isBuilt = true;
+	}
+
 }

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/VirtualBaseTableEntry.java

@@ -15,38 +15,20 @@
  */
 package ghidra.app.util.pdb.classtype;
 
+import ghidra.program.model.gclass.ClassID;
+
 /**
  * Represents the Entry for a Virtual Base Table
  */
 public class VirtualBaseTableEntry implements VBTableEntry {
-	private Long offset;
 	private ClassID baseId;
 
 	// Re-evaluate which constructors and setters we need
 
-	public VirtualBaseTableEntry(Long offset) {
-		this(offset, null);
-	}
-
 	public VirtualBaseTableEntry(ClassID baseId) {
-		this(null, baseId);
-	}
-
-	public VirtualBaseTableEntry(Long offset, ClassID baseId) {
-		this.offset = offset;
 		this.baseId = baseId;
 	}
 
-	@Override
-	public void setOffset(Long offset) {
-		this.offset = offset;
-	}
-
-	@Override
-	public Long getOffset() {
-		return offset;
-	}
-
 	@Override
 	public void setClassId(ClassID baseId) {
 		this.baseId = baseId;

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/VirtualFunctionTable.java

@@ -15,55 +15,59 @@
  */
 package ghidra.app.util.pdb.classtype;
 
-import java.util.ArrayList;
+import java.util.*;
-import java.util.List;
 
 import ghidra.app.util.SymbolPath;
 import ghidra.app.util.bin.format.pdb2.pdbreader.PdbException;
 import ghidra.program.model.address.Address;
+import ghidra.program.model.data.*;
+import ghidra.program.model.gclass.ClassID;
+import ghidra.program.model.gclass.ClassUtils;
 
 public abstract class VirtualFunctionTable implements VFTable {
 
 	protected ClassID owner;
 	protected List<ClassID> parentage;
 	/**
-	 * The number of entries in the table
+	 * The number of entries in the table, as specified by the user
 	 */
-	protected int numEntries;
+	protected int userSpecifiedNumEntries;
 	/**
 	 * This is the offset within the class where we expect to find the pointer that can point to
 	 *  this table
 	 */
-	protected int ptrOffsetInClass;
+	protected Long ptrOffsetInClass;
+
+	protected int maxTableIndexSeen;
+	protected Map<Integer, VirtualFunctionTableEntry> entriesByTableIndex;
+
+	// result of compile/build
+	private Structure tableStructure;
+	private boolean isBuilt;
 
 	/**
+	 * Constructor.
 	 * Virtual Function Table for a base (parent) class within an owner class.  The owner and parent
 	 * class can be null if not known, but methods are offered to fill them in if/when this
 	 * information becomes available
-	 * @param owner class that owns this VBT (can own more than one). Can be null
+	 * @param owner class that owns this VBT (can own more than one); can be {@code null}
-	 * @param parentage parentage for which this VBT is used.  Can be null
+	 * @param parentage parentage for which this VFT is used; can be {@code null}
 	 */
 	VirtualFunctionTable(ClassID owner, List<ClassID> parentage) {
 		this.owner = owner;
 		this.parentage = new ArrayList<>(parentage);
-		numEntries = 0;
+		userSpecifiedNumEntries = 0;
+		maxTableIndexSeen = -1;
+		entriesByTableIndex = new TreeMap<>();
 	}
 
 	/**
-	 * Returns the address value at the index in the table
+	 * Returns the address value at the table offset
-	 * @param index the index
+	 * @param tableIndex the index location in the virtual function table for the entry; based at 1
 	 * @return the address
 	 * @throws PdbException upon error retrieving the value
 	 */
-	public abstract Address getAddress(int index) throws PdbException;
+	public abstract Address getAddress(int tableIndex) throws PdbException;
-
-	/**
-	 * Returns the symbol path of the function at the index in the table
-	 * @param index the index
-	 * @return the symbol path
-	 * @throws PdbException upon error retrieving the value
-	 */
-	public abstract SymbolPath getPath(int index) throws PdbException;
 
 	/**
 	 * Returns the owning class
@@ -81,20 +85,55 @@ public abstract class VirtualFunctionTable implements VFTable {
 		return parentage;
 	}
 
+	/**
+	 * Gets the offset within the class for the pointer that can point to this table
+	 * @return the offset
+	 */
+	public Long getPtrOffsetInClass() {
+		return ptrOffsetInClass;
+	}
+
+	protected abstract VirtualFunctionTableEntry getNewEntry(SymbolPath originalMethodPath,
+			SymbolPath overrideMethodPath, Pointer functionPointer);
+
+	/**
+	 * Method to add an entry to the virtual function table
+	 * @param tableIndex the index location in the virtual function table for the entry; based at 1
+	 * @param originalMethodPath the symbol path of the method
+	 * @param overrideMethodPath the symbol path of the override method
+	 * @param functionPointer pointer to the function definition of the method
+	 */
+	public void addEntry(int tableIndex, SymbolPath originalMethodPath,
+			SymbolPath overrideMethodPath, Pointer functionPointer) {
+		VirtualFunctionTableEntry entry =
+			getNewEntry(originalMethodPath, overrideMethodPath, functionPointer);
+		entriesByTableIndex.put(tableIndex, entry);
+		maxTableIndexSeen = Integer.max(maxTableIndexSeen, tableIndex);
+	}
+
+	/**
+	 * Returns the entry for the table offset
+	 * @param tableIndex the index location in the virtual function table for the entry; based at 1
+	 * @return the entry
+	 */
+	public VirtualFunctionTableEntry getEntry(int tableIndex) {
+		return entriesByTableIndex.get(tableIndex);
+	}
+
 	/**
 	 * Returns the number of entries in the table
 	 * @return the number of entries
 	 */
 	public int getNumEntries() {
-		return numEntries;
+		return entriesByTableIndex.size();
 	}
 
 	/**
-	 * Gets the offset within the class for the pointer that can point to this table
+	 * Returns the number of entries in the table, as specified by the user
-	 * @return the offset
+	 * @return the number of entries
 	 */
-	public int getPtrOffsetInClass() {
+	public int getUserSpecifiedNumEntries() {
-		return ptrOffsetInClass;
+		return userSpecifiedNumEntries;
 	}
 
 	/**
@@ -113,22 +152,22 @@ public abstract class VirtualFunctionTable implements VFTable {
 		this.parentage = parentage;
 	}
 
-	/**
-	 * Sets the number of entries for the table
-	 * @param numEntriesArg the number of entries
-	 */
-	public void setNumEntries(int numEntriesArg) {
-		numEntries = numEntriesArg;
-	}
-
 	/**
 	 * Sets the offset within the class for the pointer that can point to this table
 	 * @param offset the offset
 	 */
-	public void setPtrOffsetInClass(int offset) {
+	public void setPtrOffsetInClass(Long offset) {
 		ptrOffsetInClass = offset;
 	}
 
+	/**
+	 * Sets the "expected" number of entries for the table
+	 * @param numEntriesArg the number of entries
+	 */
+	public void setNumEntries(int numEntriesArg) {
+		userSpecifiedNumEntries = numEntriesArg;
+	}
+
 	void emit(StringBuilder builder) {
 		builder.append("VBT for the following classes within: " + owner);
 		builder.append("\n");
@@ -137,4 +176,57 @@ public abstract class VirtualFunctionTable implements VFTable {
 			builder.append("\n");
 		}
 	}
+
+	public int size() {
+		return entriesByTableIndex.size();
+	}
+
+	public int getMaxTableIndex() {
+		return maxTableIndexSeen;
+	}
+
+	public Map<Integer, VirtualFunctionTableEntry> getEntriesByTableIndex() {
+		return entriesByTableIndex;
+	}
+
+	/**
+	 * Returns the built data type for this vftable for the current entries
+	 * @param dtm the data type manager
+	 * @param categoryPath category path for the table
+	 * @return the structure of the vftable
+	 */
+	public Structure getLayout(DataTypeManager dtm, CategoryPath categoryPath) {
+		if (!isBuilt) { // what if we want to rebuild... what should we do?
+			build(dtm, categoryPath);
+		}
+		return tableStructure;
+	}
+
+	private void build(DataTypeManager dtm, CategoryPath categoryPath) {
+		if (ptrOffsetInClass == null || maxTableIndexSeen == -1) {
+			tableStructure = null;
+			isBuilt = true;
+			return;
+		}
+		String name = ClassUtils.getSpecialVxTableName(ptrOffsetInClass);
+		DataType defaultEntry = ClassUtils.getVftDefaultEntry(dtm);
+		int entrySize = defaultEntry.getLength();
+		StructureDataType dt = new StructureDataType(categoryPath, name, 0, dtm);
+		int masterOffset = 0;
+		for (Map.Entry<Integer, VirtualFunctionTableEntry> mapEntry : entriesByTableIndex
+				.entrySet()) {
+			int tableIndex = mapEntry.getKey();
+			VFTableEntry tableEntry = mapEntry.getValue();
+			while (masterOffset < tableIndex) {
+				dt.add(defaultEntry, "", "");
+				masterOffset += entrySize;
+			}
+			dt.add(tableEntry.getFunctionPointer(), tableEntry.getOverridePath().toString(), "");
+			masterOffset += entrySize;
+		}
+		tableStructure = (Structure) dtm.resolve(dt, null);
+		//System.out.println(tableStructure.toString());
+		isBuilt = true;
+	}
+
 }

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/classtype/VirtualFunctionTableEntry.java

@@ -0,0 +1,63 @@
+/* ###
+ * 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.app.util.pdb.classtype;
+
+import ghidra.app.util.SymbolPath;
+import ghidra.program.model.data.Pointer;
+
+public class VirtualFunctionTableEntry implements VFTableEntry {
+	SymbolPath originalMethodPath;
+	SymbolPath overrideMethodPath;
+	Pointer functionPointer;
+
+	public VirtualFunctionTableEntry(SymbolPath originalMethodPath, SymbolPath overrideMethodPath,
+			Pointer functionPointer) {
+		this.originalMethodPath = originalMethodPath;
+		this.overrideMethodPath = overrideMethodPath;
+		this.functionPointer = functionPointer;
+	}
+
+	@Override
+	public void setOriginalPath(SymbolPath path) {
+		originalMethodPath = path;
+	}
+
+	@Override
+	public SymbolPath getOriginalPath() {
+		return originalMethodPath;
+	}
+
+	@Override
+	public void setOverridePath(SymbolPath path) {
+		overrideMethodPath = path;
+	}
+
+	@Override
+	public SymbolPath getOverridePath() {
+		return overrideMethodPath;
+	}
+
+	@Override
+	public void setFunctionPointer(Pointer pointer) {
+		functionPointer = pointer;
+	}
+
+	@Override
+	public Pointer getFunctionPointer() {
+		return functionPointer;
+	}
+
+}

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/pdbapplicator/CompositeTypeApplier.java

@@ -23,8 +23,7 @@ import ghidra.app.util.SymbolPath;
 import ghidra.app.util.bin.format.pdb.DefaultCompositeMember;
 import ghidra.app.util.bin.format.pdb2.pdbreader.*;
 import ghidra.app.util.bin.format.pdb2.pdbreader.type.*;
-import ghidra.app.util.pdb.classtype.Access;
+import ghidra.app.util.pdb.classtype.*;
-import ghidra.app.util.pdb.classtype.ClassFieldAttributes;
 import ghidra.program.model.data.*;
 import ghidra.util.Msg;
 import ghidra.util.exception.AssertException;
@@ -195,6 +194,8 @@ public class CompositeTypeApplier extends AbstractComplexTypeApplier {
 		addVftPtrs(composite, classType, lists.vftPtrs(), type, myMembers);
 		addMembers(composite, classType, lists.nonstaticMembers(), type, myMembers);
 
+		addMethods(combo, lists.methods());
+
 		if (!classType.validate()) {
 			// TODO: Investigate.  We should do this check for some classes somewhere.  Should
 			// we do it here.  Set breakpoint here to investigate.
@@ -241,8 +242,7 @@ public class CompositeTypeApplier extends AbstractComplexTypeApplier {
 			throws PdbException, CancelledException {
 
 		AbstractCompositeMsType cType = (AbstractCompositeMsType) type;
-		Access defaultAccess = (type instanceof AbstractClassMsType) ? Access.PRIVATE
+		Access defaultAccess = myClassType.getDefaultAccess();
-				: Access.PUBLIC;
 
 		for (AbstractMsType baseType : msBases) {
 			applicator.checkCancelled();
@@ -364,6 +364,90 @@ public class CompositeTypeApplier extends AbstractComplexTypeApplier {
 		return dataType;
 	}
 
+	private void addMethods(ComboType combo, List<AbstractMsType> methods)
+			throws CancelledException {
+
+		if (methods.isEmpty()) {
+			return;
+		}
+		CppCompositeType cppCompositeType = combo.ct();
+		SymbolPath classSymbolPath = cppCompositeType.getSymbolPath();
+		Access defaultAccess = cppCompositeType.getDefaultAccess();
+
+		for (AbstractMsType methodType : methods) {
+			applicator.checkCancelled();
+			if (methodType instanceof AbstractOneMethodMsType oneMethodType) {
+				String name = oneMethodType.getName();
+				ClassFieldMsAttributes attributes = oneMethodType.getAttributes();
+				AbstractMsType t =
+					applicator.getPdb().getTypeRecord(oneMethodType.getProcedureTypeRecordNumber());
+				int adjuster = 0;
+				if (t instanceof AbstractMemberFunctionMsType memberFunc) {
+					adjuster = memberFunc.getThisAdjuster();
+				}
+				Long offset = oneMethodType.getOffsetInVFTableIfIntroVirtual();
+				RecordNumber procedureTypeRn = oneMethodType.getProcedureTypeRecordNumber();
+				DataType dt = applicator.getDataType(procedureTypeRn);
+				if (!(dt instanceof FunctionDefinition def)) {
+					Msg.warn(this,
+						"MemberFunction expected, but found: " + dt.getClass().getSimpleName());
+					// Put something in its place?  Or abort the whole class?
+					continue;
+				}
+				SymbolPath methodSymbolPath =
+					classSymbolPath.append(new SymbolPath(name)).replaceInvalidChars();
+				ClassFieldAttributes atts = ClassFieldAttributes.convert(attributes, defaultAccess);
+				if (atts.getProperty() == Property.VIRTUAL) {
+					cppCompositeType.addVirtualMethod(adjuster, offset.intValue(), methodSymbolPath,
+						def);
+				}
+			}
+			else if (methodType instanceof AbstractOverloadedMethodMsType overloadedMethodType) {
+				String name = overloadedMethodType.getName();
+				RecordNumber methodsListRn = overloadedMethodType.getTypeMethodListRecordNumber();
+				AbstractMsType methodsListTry = applicator.getTypeRecord(methodsListRn);
+				if (methodsListTry instanceof AbstractMethodListMsType methodsListType) {
+					SymbolPath methodSymbolPath =
+						classSymbolPath.append(new SymbolPath(name)).replaceInvalidChars();
+					List<AbstractMethodRecordMs> recordList = methodsListType.getList();
+					for (AbstractMethodRecordMs methodRecord : recordList) {
+						applicator.checkCancelled();
+						Long offset = methodRecord.getOptionalOffset();
+						RecordNumber procedureTypeRn = methodRecord.getProcedureTypeRecordNumber();
+						ClassFieldMsAttributes attributes = methodRecord.getAttributes();
+						AbstractMsType t = applicator.getPdb().getTypeRecord(procedureTypeRn);
+						int adjuster = 0;
+						if (t instanceof AbstractMemberFunctionMsType memberFunc) {
+							adjuster = memberFunc.getThisAdjuster();
+						}
+						DataType dt = applicator.getDataType(procedureTypeRn);
+						if (!(dt instanceof FunctionDefinition def)) {
+							Msg.warn(this,
+								"MemberFunction expected, but found: " +
+									dt.getClass().getSimpleName());
+							// Put something in its place?  Or abort the whole class?
+							continue;
+						}
+						ClassFieldAttributes atts =
+							ClassFieldAttributes.convert(attributes, defaultAccess);
+						if (atts.getProperty() == Property.VIRTUAL) {
+							cppCompositeType.addVirtualMethod(adjuster, offset.intValue(),
+								methodSymbolPath, def);
+						}
+					}
+				}
+				else {
+					Msg.warn(this, "Unexexpected method list type: " +
+						methodsListTry.getClass().getSimpleName());
+				}
+			}
+			else {
+				Msg.warn(this,
+					"Unexexpected method type: " + methodType.getClass().getSimpleName());
+			}
+		}
+	}
+
 	private void addMembers(Composite composite, CppCompositeType myClassType,
 			List<AbstractMemberMsType> msMembers, AbstractCompositeMsType type,
 			List<DefaultPdbUniversalMember> myMembers) throws CancelledException, PdbException {

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/pdbapplicator/CppCompositeType.java

@@ -25,6 +25,7 @@ import ghidra.app.util.bin.format.pdb2.pdbreader.PdbException;
 import ghidra.app.util.bin.format.pdb2.pdbreader.PdbLog;
 import ghidra.app.util.pdb.classtype.*;
 import ghidra.program.model.data.*;
+import ghidra.program.model.gclass.ClassID;
 import ghidra.program.model.gclass.ClassUtils;
 import ghidra.util.Msg;
 import ghidra.util.exception.CancelledException;
@@ -41,7 +42,6 @@ public class CppCompositeType {
 	private static final String VIRTUAL_BASE_COMMENT = "Virtual Base";
 	private static final String VIRTUAL_BASE_SPECULATIVE_COMMENT =
 		"Virtual Base - Speculative Placement";
-	//private static final String INDIRECT_VIRTUAL_BASE_CLASS_COMMENT = "Indirect Virtual Base Class";
 
 	private boolean isFinal;
 	private ClassKey classKey;
@@ -50,8 +50,7 @@ public class CppCompositeType {
 	private int size;
 	private SymbolPath symbolPath;
 	private CategoryPath categoryPath;
-	private DataTypePath selfBaseDataTypePath;
+	private ClassID myId;
-	private ProgramClassID myId;
 
 	private CategoryPath baseCategoryPath;
 	private CategoryPath internalsCategoryPath;
@@ -71,6 +70,13 @@ public class CppCompositeType {
 	private List<AbstractMember> myMembers;
 	private List<Member> layoutMembers;
 
+	private static record VirtualFunctionInfo(Integer tableOffset, Integer thisAdjuster,
+			SymbolPath name, FunctionDefinition definition) {}
+
+	private List<VirtualFunctionInfo> virtualFunctionInfo;
+
+	//----
+
 	private List<SyntacticBaseClass> syntacticBaseClasses;
 
 	//==============================================================================================
@@ -99,6 +105,11 @@ public class CppCompositeType {
 	 */
 	private Long mainVbtPtrOffset;
 
+	/**
+	 * Holds the main Vft for this class
+	 */
+	private VirtualFunctionTable mainVft;
+
 	/**
 	 * Holds the main Vbt for this class
 	 */
@@ -126,19 +137,6 @@ public class CppCompositeType {
 	private TreeMap<ClassID, Long> baseOffsetById;
 
 	//==============================================================================================
-	// Data used for resolving main vftptr
-
-	/*
-	 * Not certain, but think there should only be one Virtual Base Table for a given
-	 * class (not counting those for its parents).  However, since VirtualBaseClass and
-	 * IndirectVirtualBase class records both have an "offset" for (seemingly) where the
-	 * virtual base table point can be located, then there is a chance that different
-	 * records for a class could have different values.  This HashMap will is keyed by this
-	 * offset, in case we see more than one.  Want to log the fact if more than one value is seen
-	 * for a particular hierarchy level.
-	 */
-	private Map<Long, PlaceholderVirtualBaseTable> placeholderVirtualBaseTables;
-
 	//==============================================================================================
 	// Data used for analyzing Vxts and their parentage
 
@@ -148,8 +146,10 @@ public class CppCompositeType {
 	private TreeSet<VxtPtrInfo> propagatedDirectVirtualBaseVbts;
 	private TreeSet<VxtPtrInfo> propagatededIndirectVirtualBaseVfts;
 	private TreeSet<VxtPtrInfo> propagatedIndirectVirtualBaseVbts;
-	private TreeMap<Long, VxtPtrInfo> finalLayoutVfts;
+	private TreeMap<Long, VxtPtrInfo> finalVftPtrInfoByOffset;
-	private TreeMap<Long, VxtPtrInfo> finalLayoutVbts;
+	private TreeMap<Long, VxtPtrInfo> finalVbtPtrInfoByOffset;
+	private TreeMap<Long, VXT> finalVftByOffset;
+	private TreeMap<Long, VXT> finalVbtByOffset;
 
 	//==============================================================================================
 	//==============================================================================================
@@ -165,13 +165,14 @@ public class CppCompositeType {
 		this.composite = composite;
 		this.mangledName = mangledName;
 		myId = getClassId(this);
+		categoryPath = new CategoryPath(composite.getCategoryPath(), composite.getName());
 		internalsCategoryPath = ClassUtils.getClassInternalsPath(composite);  // eliminate
-		selfBaseDataTypePath = ClassUtils.getBaseClassDataTypePath(composite);
 
 		directLayoutBaseClasses = new ArrayList<>();
 		virtualLayoutBaseClasses = new ArrayList<>();
 		directVirtualLayoutBaseClasses = new ArrayList<>();
 		indirectVirtualLayoutBaseClasses = new ArrayList<>();
+		virtualFunctionInfo = new ArrayList<>();
 
 		vftPtrTypeByOffset = new TreeMap<>();
 		myMembers = new ArrayList<>();
@@ -343,7 +344,7 @@ public class CppCompositeType {
 	}
 
 	/**
-	 * Method for adding a member to this type, to include a attribtues and comment
+	 * Method for adding a member to this type, to include a attributes and comment
 	 * @param memberName member name
 	 * @param dataType data type of member
 	 * @param isFlexibleArray {@code true} if member is a flexible array
@@ -359,6 +360,20 @@ public class CppCompositeType {
 		addMember(layoutMembers, newMember);
 	}
 
+	/**
+	 * Method for adding a virtual method to this type
+	 * @param thisAdjuster the this-adjustor offset
+	 * @param tableOffset virtual function table offset
+	 * @param name function name
+	 * @param definition function definition
+	 */
+	public void addVirtualMethod(int thisAdjuster, int tableOffset, SymbolPath name,
+			FunctionDefinition definition) {
+		VirtualFunctionInfo info =
+			new VirtualFunctionInfo(tableOffset, thisAdjuster, name, definition);
+		virtualFunctionInfo.add(info);
+	}
+
 	/**
 	 * Method to perform class layout from the user specified information.  Note that all
 	 * dependency classes (parents, etc.) must have had their like-processing performed
@@ -368,7 +383,7 @@ public class CppCompositeType {
 	 * @throws PdbException upon issue performing the layout
 	 * @throws CancelledException upon user cancellation
 	 */
-	public void createLayout(ObjectOrientedClassLayout layoutOptions, VxtManager vxtManager,
+	public void createLayout(ObjectOrientedClassLayout layoutOptions, MsftVxtManager vxtManager,
 			TaskMonitor monitor) throws PdbException, CancelledException {
 		switch (layoutOptions) {
 			case MEMBERS_ONLY:
@@ -427,6 +442,14 @@ public class CppCompositeType {
 		return classKey;
 	}
 
+	/**
+	 * Returns the default access of the type
+	 * @return the default access
+	 */
+	public Access getDefaultAccess() {
+		return ClassKey.CLASS.equals(classKey) ? Access.PRIVATE : Access.PUBLIC;
+	}
+
 	/**
 	 * Method to set the name of the composite
 	 * @param className the name
@@ -518,7 +541,7 @@ public class CppCompositeType {
 	 * Returns the ClassID for this class
 	 * @return the class id
 	 */
-	public ProgramClassID getClassId() {
+	public ClassID getClassId() {
 		return myId;
 	}
 
@@ -540,6 +563,14 @@ public class CppCompositeType {
 		return selfBaseType;
 	}
 
+	/**
+	 * Returns the CategoryPath of this composite
+	 * @return the CategoryPath
+	 */
+	public CategoryPath getCategoryPath() {
+		return categoryPath;
+	}
+
 	// TODO: move to ClassUtils?
 	/**
 	 * Returns the "internals" CategoryPath of this composite
@@ -672,8 +703,8 @@ public class CppCompositeType {
 	 * @param cpp the CPP type
 	 * @return the class id
 	 */
-	private static ProgramClassID getClassId(CppCompositeType cpp) {
+	private static ClassID getClassId(CppCompositeType cpp) {
-		return new ProgramClassID(cpp.baseCategoryPath, cpp.getSymbolPath());
+		return new ClassID(cpp.baseCategoryPath, cpp.getSymbolPath());
 	}
 
 	//==============================================================================================
@@ -769,15 +800,15 @@ public class CppCompositeType {
 
 	//==============================================================================================
 	//==============================================================================================
-	private void createHierarchicalClassLayout(VxtManager vxtManager, TaskMonitor monitor)
+	private void createHierarchicalClassLayout(MsftVxtManager vxtManager, TaskMonitor monitor)
 			throws PdbException, CancelledException {
 
 		initLayoutAlgorithmData();
 
-		findDirectBaseVxtPtrs();
+		findDirectBaseVxtPtrs(vxtManager);
 
-		findOrAllocateMainVftPtr();
+		findOrAllocateMainVftPtr(vxtManager);
-		findOrAllocateMainVbtPtr();
+		findOrAllocateMainVbtPtr(vxtManager);
 
 		createClassLayout(vxtManager, monitor);
 
@@ -803,11 +834,6 @@ public class CppCompositeType {
 
 		baseOffsetById = new TreeMap<>();
 
-		//======
-		// Data used for resolving main vftptr
-
-		placeholderVirtualBaseTables = new HashMap<>();
-
 		//======
 		// Data used for analyzing Vxts and their parentage
 
@@ -817,8 +843,10 @@ public class CppCompositeType {
 		propagatedDirectVirtualBaseVbts = new TreeSet<>();
 		propagatededIndirectVirtualBaseVfts = new TreeSet<>();
 		propagatedIndirectVirtualBaseVbts = new TreeSet<>();
-		finalLayoutVfts = new TreeMap<>();
+		finalVftPtrInfoByOffset = new TreeMap<>();
-		finalLayoutVbts = new TreeMap<>();
+		finalVbtPtrInfoByOffset = new TreeMap<>();
+		finalVftByOffset = new TreeMap<>();
+		finalVbtByOffset = new TreeMap<>();
 	}
 
 	/**
@@ -838,45 +866,45 @@ public class CppCompositeType {
 		PNode childToParentNode;
 		PNode parentToChildNode;
 
-		for (VxtPtrInfo info : finalLayoutVfts.values()) {
+		for (VxtPtrInfo info : finalVftPtrInfoByOffset.values()) {
 			List<ClassID> parentage = info.parentage();
 			childToParentNode = vftChildToParentRoot;
 			parentToChildNode = vftParentToChildRoot;
 			for (ClassID id : parentage) {
-				String name = ((ProgramClassID) id).getSymbolPath().toString();
+				String name = id.getSymbolPath().toString();
 				childToParentNode.incrementPathCount();
 				childToParentNode = childToParentNode.getOrAddBranch(name);
 			}
 			for (ClassID id : parentage.reversed()) {
-				String name = ((ProgramClassID) id).getSymbolPath().toString();
+				String name = id.getSymbolPath().toString();
 				parentToChildNode.incrementPathCount();
 				parentToChildNode = parentToChildNode.getOrAddBranch(name);
 			}
 		}
-		for (VxtPtrInfo info : finalLayoutVbts.values()) {
+		for (VxtPtrInfo info : finalVbtPtrInfoByOffset.values()) {
 			List<ClassID> parentage = info.parentage();
 			childToParentNode = vbtChildToParentRoot;
 			parentToChildNode = vbtParentToChildRoot;
 			for (ClassID id : parentage) {
-				String name = ((ProgramClassID) id).getSymbolPath().toString();
+				String name = id.getSymbolPath().toString();
 				childToParentNode.incrementPathCount();
 				childToParentNode = childToParentNode.getOrAddBranch(name);
 			}
 			for (ClassID id : parentage.reversed()) {
-				String name = ((ProgramClassID) id).getSymbolPath().toString();
+				String name = id.getSymbolPath().toString();
 				parentToChildNode.incrementPathCount();
 				parentToChildNode = parentToChildNode.getOrAddBranch(name);
 			}
 		}
 
 		StringBuilder builder = new StringBuilder();
-		for (VxtPtrInfo info : finalLayoutVfts.values()) {
+		for (VxtPtrInfo info : finalVftPtrInfoByOffset.values()) {
 			List<ClassID> altParentage =
 				finalizeVxtPtrParentage(vftChildToParentRoot, vftParentToChildRoot, info);
 			builder.append(dumpVxtPtrResult("vft", info, altParentage));
 
 		}
-		for (VxtPtrInfo info : finalLayoutVbts.values()) {
+		for (VxtPtrInfo info : finalVbtPtrInfoByOffset.values()) {
 			List<ClassID> altParentage =
 				finalizeVxtPtrParentage(vbtChildToParentRoot, vbtParentToChildRoot, info);
 			builder.append(dumpVxtPtrResult("vbt", info, altParentage));
@@ -901,7 +929,7 @@ public class CppCompositeType {
 		String startNode = null;
 
 		for (ClassID id : parentage) {
-			String name = ((ProgramClassID) id).getSymbolPath().toString();
+			String name = id.getSymbolPath().toString();
 			childToParentNode = childToParentNode.getBranch(name);
 			if (childToParentNode.getPathCount() == 1) {
 				startNode = name;
@@ -913,7 +941,7 @@ public class CppCompositeType {
 		//  (use all nodes)
 		boolean foundStart = (startNode == null);
 		for (ClassID id : parentage.reversed()) {
-			String name = ((ProgramClassID) id).getSymbolPath().toString();
+			String name = id.getSymbolPath().toString();
 			if (name.equals(startNode)) {
 				foundStart = true;
 			}
@@ -940,12 +968,12 @@ public class CppCompositeType {
 	private String dumpVxtPtrResult(String vxt, VxtPtrInfo info, List<ClassID> altParentage) {
 		List<String> r1 = new ArrayList<>();
 		for (ClassID id : altParentage.reversed()) {
-			String name = ((ProgramClassID) id).getSymbolPath().toString();
+			String name = id.getSymbolPath().toString();
 			r1.add(name);
 		}
 		List<String> r2 = new ArrayList<>();
 		for (ClassID id : info.parentage().reversed()) {
-			String name = ((ProgramClassID) id).getSymbolPath().toString();
+			String name = id.getSymbolPath().toString();
 			r2.add(name);
 		}
 		return String.format("  %4d %s %s\t%s\n", info.finalOffset(), vxt, r1.toString(),
@@ -990,9 +1018,17 @@ public class CppCompositeType {
 	 * @throws CancelledException upon user cancellation
 	 * @throws PdbException up issue with finding the vbt or assigning offsets to virtual bases
 	 */
-	private void createClassLayout(VxtManager vxtManager, TaskMonitor monitor)
+	private void createClassLayout(MsftVxtManager vxtManager, TaskMonitor monitor)
 			throws CancelledException, PdbException {
 		List<ClassPdbMember> selfBaseMembers = getSelfBaseClassMembers();
+		mainVft = getMainVft(vxtManager);
+		if (mainVft != null) {
+			updateMainVft();
+			for (VXT t : finalVftByOffset.values()) {
+				VirtualFunctionTable vft = (VirtualFunctionTable) t;
+				updateVftFromSelf(vft);
+			}
+		}
 		if (getNumLayoutVirtualBaseClasses() == 0) {
 			if (!DefaultCompositeMember.applyDataTypeMembers(composite, false, false, size,
 				selfBaseMembers, msg -> Msg.warn(this, msg), monitor)) {
@@ -1010,13 +1046,22 @@ public class CppCompositeType {
 				new ClassPdbMember("", selfBaseType, false, 0, SELF_BASE_COMMENT);
 
 			mainVbt = getMainVbt(vxtManager);
+			if (mainVbt != null) {
+				updateMainVbt();
+				// If there was any updating to do for secondary tables, we would do it here.
+				//  Something to consider in the future
+//				for (VXT t : finalVbtByOffset.values()) {
+//					VirtualBaseTable vbt = (VirtualBaseTable) t;
+//					updateVbtFromSelf(vbt);
+//				}
+			}
 			assignVirtualBaseOffsets();
 
 			String baseComment = (mainVbt instanceof ProgramVirtualBaseTable) ? VIRTUAL_BASE_COMMENT
 					: VIRTUAL_BASE_SPECULATIVE_COMMENT;
 			TreeMap<Long, ClassPdbMember> virtualBasePdbMembers =
 				getVirtualBaseClassMembers(baseComment);
-			findVirtualBaseVxtPtrs();
+			findVirtualBaseVxtPtrs(vxtManager);
 
 			TreeMap<Long, ClassPdbMember> allMembers = new TreeMap<>();
 			allMembers.put(0L, directClassPdbMember);
@@ -1178,22 +1223,26 @@ public class CppCompositeType {
 	 * Finds all virtual base and virtual function pointers in the hierarchy of this class's
 	 *  self base.
 	 */
-	private void findDirectBaseVxtPtrs() {
+	private void findDirectBaseVxtPtrs(VxtManager vxtManager) {
 		for (DirectLayoutBaseClass base : directLayoutBaseClasses) {
 			CppCompositeType cppBaseType = base.getBaseClassType();
-			ProgramClassID baseId = cppBaseType.getClassId();
+			ClassID baseId = cppBaseType.getClassId();
 			long baseOffset = base.getOffset();
 			// Note that if the parent has already had its layout done, it will not have
 			//  used the vxtManager that we are passing in here; it will have used whatever
 			//  was passed to the layout method for that class
-			for (VxtPtrInfo info : cppBaseType.getPropagatedSelfBaseVfts()) {
+			for (VxtPtrInfo parentInfo : cppBaseType.getPropagatedSelfBaseVfts()) {
-				VxtPtrInfo newInfo = createSelfOwnedDirectVxtPtrInfo(info, baseId, baseOffset);
+				VxtPtrInfo newInfo =
-				storeVxtInfo(propagatedSelfBaseVfts, finalLayoutVfts, vftTableIdByOffset,
+					createSelfOwnedDirectVxtPtrInfo(parentInfo, baseId, baseOffset);
+				updateVft(vxtManager, baseId, newInfo, parentInfo);
+				storeVxtInfo(propagatedSelfBaseVfts, finalVftPtrInfoByOffset, vftTableIdByOffset,
 					vftOffsetByTableId, newInfo);
 			}
-			for (VxtPtrInfo info : cppBaseType.getPropagatedSelfBaseVbts()) {
+			for (VxtPtrInfo parentInfo : cppBaseType.getPropagatedSelfBaseVbts()) {
-				VxtPtrInfo newInfo = createSelfOwnedDirectVxtPtrInfo(info, baseId, baseOffset);
+				VxtPtrInfo newInfo =
-				storeVxtInfo(propagatedSelfBaseVbts, finalLayoutVbts, vbtTableIdByOffset,
+					createSelfOwnedDirectVxtPtrInfo(parentInfo, baseId, baseOffset);
+				updateVbt(vxtManager, baseId, newInfo, parentInfo);
+				storeVxtInfo(propagatedSelfBaseVbts, finalVbtPtrInfoByOffset, vbtTableIdByOffset,
 					vbtOffsetByTableId, newInfo);
 			}
 		}
@@ -1205,32 +1254,36 @@ public class CppCompositeType {
 	 *  we are not relying on the "indirect" virtual base class information from the PDB.  This
 	 *  is done this way so that we can collect parentage information for the pointers.
 	 */
-	private void findVirtualBaseVxtPtrs() {
+	private void findVirtualBaseVxtPtrs(MsftVxtManager vxtManager) {
 		// Walk direct bases to find vxts of virtual bases.  TODO: also notate all rolled up
 		//  virtuals for each direct base.
 		for (DirectLayoutBaseClass base : directLayoutBaseClasses) {
 
 			CppCompositeType cppBaseType = base.getBaseClassType();
-
+			ClassID baseId = cppBaseType.getClassId();
 			for (VxtPtrInfo info : cppBaseType.getPropagatedDirectVirtualBaseVfts()) {
 				VxtPtrInfo newInfo = createSelfOwnedVirtualVxtPtrInfo(info);
-				storeVxtInfo(propagatedDirectVirtualBaseVfts, finalLayoutVfts, vftTableIdByOffset,
+				updateVft(vxtManager, baseId, newInfo, info);
-					vftOffsetByTableId, newInfo);
+				storeVxtInfo(propagatedDirectVirtualBaseVfts, finalVftPtrInfoByOffset,
+					vftTableIdByOffset, vftOffsetByTableId, newInfo);
 			}
 			for (VxtPtrInfo info : cppBaseType.getPropagatedDirectVirtualBaseVbts()) {
 				VxtPtrInfo newInfo = createSelfOwnedVirtualVxtPtrInfo(info);
-				storeVxtInfo(propagatedDirectVirtualBaseVbts, finalLayoutVbts, vbtTableIdByOffset,
+				updateVbt(vxtManager, baseId, newInfo, info);
-					vbtOffsetByTableId, newInfo);
+				storeVxtInfo(propagatedDirectVirtualBaseVbts, finalVbtPtrInfoByOffset,
+					vbtTableIdByOffset, vbtOffsetByTableId, newInfo);
 			}
 			for (VxtPtrInfo info : cppBaseType.getPropagatedIndirectVirtualBaseVfts()) {
 				VxtPtrInfo newInfo = createSelfOwnedVirtualVxtPtrInfo(info);
-				storeVxtInfo(propagatededIndirectVirtualBaseVfts, finalLayoutVfts,
+				updateVft(vxtManager, baseId, newInfo, info);
+				storeVxtInfo(propagatededIndirectVirtualBaseVfts, finalVftPtrInfoByOffset,
 					vftTableIdByOffset, vftOffsetByTableId, newInfo);
 			}
 			for (VxtPtrInfo info : cppBaseType.getPropagatedIndirectVirtualBaseVbts()) {
 				VxtPtrInfo newInfo = createSelfOwnedVirtualVxtPtrInfo(info);
-				storeVxtInfo(propagatedIndirectVirtualBaseVbts, finalLayoutVbts, vbtTableIdByOffset,
+				updateVbt(vxtManager, baseId, newInfo, info);
-					vbtOffsetByTableId, newInfo);
+				storeVxtInfo(propagatedIndirectVirtualBaseVbts, finalVbtPtrInfoByOffset,
+					vbtTableIdByOffset, vbtOffsetByTableId, newInfo);
 			}
 		}
 
@@ -1240,41 +1293,47 @@ public class CppCompositeType {
 		for (DirectVirtualLayoutBaseClass base : directVirtualLayoutBaseClasses) {
 
 			CppCompositeType cppBaseType = base.getBaseClassType();
-			ProgramClassID baseId = cppBaseType.getClassId();
+			ClassID baseId = cppBaseType.getClassId();
 
 			for (VxtPtrInfo info : cppBaseType.getPropagatedSelfBaseVfts()) {
 				VxtPtrInfo newInfo = createVirtualOwnedSelfVxtPtrInfo(info, baseId);
-				storeVxtInfo(propagatedDirectVirtualBaseVfts, finalLayoutVfts, vftTableIdByOffset,
+				updateVft(vxtManager, baseId, newInfo, info);
-					vftOffsetByTableId, newInfo);
+				storeVxtInfo(propagatedDirectVirtualBaseVfts, finalVftPtrInfoByOffset,
+					vftTableIdByOffset, vftOffsetByTableId, newInfo);
 			}
 			for (VxtPtrInfo info : cppBaseType.getPropagatedSelfBaseVbts()) {
 				VxtPtrInfo newInfo = createVirtualOwnedSelfVxtPtrInfo(info, baseId);
-				storeVxtInfo(propagatedDirectVirtualBaseVbts, finalLayoutVbts, vbtTableIdByOffset,
+				updateVbt(vxtManager, baseId, newInfo, info);
-					vbtOffsetByTableId, newInfo);
+				storeVxtInfo(propagatedDirectVirtualBaseVbts, finalVbtPtrInfoByOffset,
+					vbtTableIdByOffset, vbtOffsetByTableId, newInfo);
 			}
 			for (VxtPtrInfo info : cppBaseType.getPropagatedDirectVirtualBaseVfts()) {
 				VxtPtrInfo newInfo = createVirtualOwnedVirtualVxtPtrInfo(info);
-				storeVxtInfo(propagatededIndirectVirtualBaseVfts, finalLayoutVfts,
+				updateVft(vxtManager, baseId, newInfo, info);
+				storeVxtInfo(propagatededIndirectVirtualBaseVfts, finalVftPtrInfoByOffset,
 					vftTableIdByOffset, vftOffsetByTableId, newInfo);
 			}
 			for (VxtPtrInfo info : cppBaseType.getPropagatedDirectVirtualBaseVbts()) {
 				VxtPtrInfo newInfo = createVirtualOwnedVirtualVxtPtrInfo(info);
-				storeVxtInfo(propagatedIndirectVirtualBaseVbts, finalLayoutVbts, vbtTableIdByOffset,
+				updateVbt(vxtManager, baseId, newInfo, info);
-					vbtOffsetByTableId, newInfo);
+				storeVxtInfo(propagatedIndirectVirtualBaseVbts, finalVbtPtrInfoByOffset,
+					vbtTableIdByOffset, vbtOffsetByTableId, newInfo);
 			}
 			for (VxtPtrInfo info : cppBaseType.getPropagatedIndirectVirtualBaseVfts()) {
 				VxtPtrInfo newInfo = createVirtualOwnedVirtualVxtPtrInfo(info);
-				storeVxtInfo(propagatededIndirectVirtualBaseVfts, finalLayoutVfts,
+				updateVft(vxtManager, baseId, newInfo, info);
+				storeVxtInfo(propagatededIndirectVirtualBaseVfts, finalVftPtrInfoByOffset,
 					vftTableIdByOffset, vftOffsetByTableId, newInfo);
 			}
 			for (VxtPtrInfo info : cppBaseType.getPropagatedIndirectVirtualBaseVbts()) {
 				VxtPtrInfo newInfo = createVirtualOwnedVirtualVxtPtrInfo(info);
-				storeVxtInfo(propagatedIndirectVirtualBaseVbts, finalLayoutVbts, vbtTableIdByOffset,
+				updateVbt(vxtManager, baseId, newInfo, info);
-					vbtOffsetByTableId, newInfo);
+				storeVxtInfo(propagatedIndirectVirtualBaseVbts, finalVbtPtrInfoByOffset,
+					vbtTableIdByOffset, vbtOffsetByTableId, newInfo);
+			}
 		}
 
 	}
-	}
 
 	// Note sure what the final information will look like when we are done.  For this stopping
 	//  point, this method stores what we currently want to store
@@ -1284,7 +1343,6 @@ public class CppCompositeType {
 	 * @param finalInfo the final info tree
 	 * @param tableIdByOffset the table-id-by-offset map
 	 * @param offsetByTableId the offset-by-table-id map
-	 * @param info the vxt ptr info
 	 */
 	private void storeVxtInfo(TreeSet<VxtPtrInfo> propagate, TreeMap<Long, VxtPtrInfo> finalInfo,
 			Map<Long, OwnerParentage> tableIdByOffset, Map<OwnerParentage, Long> offsetByTableId,
@@ -1364,7 +1422,7 @@ public class CppCompositeType {
 				throw new PdbException("Cannot place base class");
 			}
 			baseOffset += base.getBasePointerOffset();
-			ProgramClassID baseId = cppBaseType.getClassId();
+			ClassID baseId = cppBaseType.getClassId();
 			baseOffsetById.put(baseId, baseOffset);
 		}
 	}
@@ -1373,7 +1431,7 @@ public class CppCompositeType {
 	 * Finds or allocates (if needed) the Virtual Function Table "Pointer" within the class
 	 * structure
 	 */
-	private void findOrAllocateMainVftPtr() {
+	private void findOrAllocateMainVftPtr(MsftVxtManager vxtManager) {
 		if (propagatedSelfBaseVfts.isEmpty()) {
 			if (!vftPtrTypeByOffset.isEmpty()) {
 				if (vftPtrTypeByOffset.size() > 1) {
@@ -1382,8 +1440,21 @@ public class CppCompositeType {
 				myVftPtrOffset = vftPtrTypeByOffset.firstKey();
 				VxtPtrInfo info =
 					new VxtPtrInfo(myVftPtrOffset, myVftPtrOffset, myId, List.of(myId));
+				VirtualFunctionTable myVft =
+					vxtManager.findVft(myId, List.of(myId));
+				if (myVft != null) {
+					myVft.setPtrOffsetInClass(info.finalOffset());
 					propagatedSelfBaseVfts.add(info);
-				finalLayoutVfts.put(info.accumOffset(), info);
+					finalVftByOffset.put(info.finalOffset(), myVft);
+				}
+				else {
+					PlaceholderVirtualFunctionTable t = new PlaceholderVirtualFunctionTable(
+						myId, List.of(myId));
+					t.setPtrOffsetInClass(info.finalOffset());
+					propagatedSelfBaseVfts.add(info);
+					finalVftByOffset.put(info.finalOffset(), t);
+				}
+				finalVftPtrInfoByOffset.put(info.accumOffset(), info);
 				OwnerParentage op = new OwnerParentage(info.baseId(), info.parentage());
 				vftTableIdByOffset.put(info.accumOffset(), op);
 				vftOffsetByTableId.put(op, info.accumOffset());
@@ -1391,17 +1462,17 @@ public class CppCompositeType {
 					ClassFieldAttributes.UNKNOWN, myVftPtrOffset.intValue());
 				layoutVftPtrMembers.add(newMember);
 				myMembers.add(newMember);
-
 			}
 		}
-		mainVftPtrOffset = finalLayoutVfts.isEmpty() ? null : finalLayoutVfts.firstKey();
+		mainVftPtrOffset =
+			finalVftPtrInfoByOffset.isEmpty() ? null : finalVftPtrInfoByOffset.firstKey();
 	}
 
 	/**
 	 * Finds or allocates (if needed) the Virtual Base Table "Pointer" for within the class
 	 * structure
 	 */
-	private void findOrAllocateMainVbtPtr() {
+	private void findOrAllocateMainVbtPtr(MsftVxtManager vxtManager) {
 		if (propagatedSelfBaseVbts.isEmpty()) {
 			if (!virtualLayoutBaseClasses.isEmpty()) {
 				TreeSet<Long> vbtOffsets = new TreeSet<>();
@@ -1416,28 +1487,247 @@ public class CppCompositeType {
 					Msg.warn(this, "Mismatch vbt location for " + myId);
 				}
 				VxtPtrInfo info = new VxtPtrInfo(vbtPtrOffset, vbtPtrOffset, myId, List.of(myId));
+				VirtualBaseTable myVbt = vxtManager.findVbt(myId, List.of(myId));
+				if (myVbt != null) {
+					myVbt.setPtrOffsetInClass(info.finalOffset());
 					propagatedSelfBaseVbts.add(info);
-				finalLayoutVbts.put(info.accumOffset(), info);
+					finalVbtByOffset.put(info.finalOffset(), myVbt);
+				}
+				finalVbtPtrInfoByOffset.put(info.accumOffset(), info);
 				OwnerParentage op = new OwnerParentage(info.baseId(), info.parentage());
 				vbtTableIdByOffset.put(info.accumOffset(), op);
 				vbtOffsetByTableId.put(op, info.accumOffset());
-				myVbtPtrOffset = finalLayoutVbts.firstKey();
+				myVbtPtrOffset = finalVbtPtrInfoByOffset.firstKey();
 				Member newMember = new Member(ClassUtils.VBPTR, ClassUtils.VXPTR_TYPE, false,
 					ClassFieldAttributes.UNKNOWN, myVbtPtrOffset.intValue());
 				layoutVbtPtrMembers.add(newMember);
 				myMembers.add(newMember);
 			}
 		}
-		mainVbtPtrOffset = finalLayoutVbts.isEmpty() ? null : finalLayoutVbts.firstKey();
+		mainVbtPtrOffset =
+			finalVbtPtrInfoByOffset.isEmpty() ? null : finalVbtPtrInfoByOffset.firstKey();
+	}
+
+	/**
+	 * Adds new entries to the main vftable for this class
+	 */
+	private void updateMainVft() {
+		for (VirtualFunctionInfo vfInfo : virtualFunctionInfo) {
+			int tableOffset = vfInfo.tableOffset();
+			// we believe this adjuster of 0 is all we want for first direct base
+			// -1 signifies not intro
+			if (vfInfo.thisAdjuster() == 0 && vfInfo.tableOffset() != -1) {
+				mainVft.addEntry(tableOffset, vfInfo.name(), vfInfo.name(),
+					new PointerDataType(vfInfo.definition()));
+			}
+		}
+	}
+
+	/**
+	 * Updates vftable entries with values from this class that override those of parent classes
+	 */
+	private VirtualFunctionTable updateVft(VxtManager vxtManager, ClassID baseId, VxtPtrInfo info,
+			VxtPtrInfo parentInfo) {
+		if (!(vxtManager instanceof MsftVxtManager mvxtManager)) {
+			// error
+			return null;
+		}
+		ClassID parentId;
+		List<ClassID> parentParentage;
+		if (parentInfo == null) {
+			parentId = info.baseId();
+			List<ClassID> parentage = info.parentage();
+			parentParentage = parentage.subList(0, parentage.size() - 1);
+		}
+		else {
+			parentId = baseId;
+			parentParentage = parentInfo.parentage();
+		}
+
+		Long finalOffset = info.finalOffset();
+		VirtualFunctionTable myVft = (VirtualFunctionTable) finalVftByOffset.get(finalOffset);
+		if (myVft == null) {
+			myVft = mvxtManager.findVft(myId, info.parentage());
+			if (myVft == null) {
+				return null;
+			}
+			finalVftByOffset.put(finalOffset, myVft);
+		}
+
+		myVft.setPtrOffsetInClass(finalOffset);
+		VirtualFunctionTable parentVft =
+			mvxtManager.findVft(parentId, parentParentage);
+
+		if (parentVft == null) {
+			// this is an error
+			return null;
+		}
+
+		for (Map.Entry<Integer, VirtualFunctionTableEntry> mapEntry : parentVft
+				.getEntriesByTableIndex()
+				.entrySet()) {
+			int tableOffset = mapEntry.getKey();
+			VFTableEntry e = mapEntry.getValue();
+			SymbolPath parentOrigPath = e.getOriginalPath();
+			SymbolPath parentPath = e.getOverridePath();
+			VFTableEntry currentEntry = myVft.getEntry(tableOffset);
+			if (currentEntry != null) {
+				SymbolPath currentOrigPath = currentEntry.getOriginalPath();
+				SymbolPath currentPath = currentEntry.getOverridePath();
+				// Note that this check also checks the method name
+				if (!parentOrigPath.equals(currentOrigPath)) {
+					// problem
+				}
+				boolean parentOverride = !parentOrigPath.equals(parentPath);
+				boolean currentOverride = !currentOrigPath.equals(currentPath);
+				if (!currentOverride && parentOverride) {
+					myVft.addEntry(tableOffset, parentOrigPath, parentPath, e.getFunctionPointer());
+				}
+				else if (currentOverride && !parentOverride) {
+					myVft.addEntry(tableOffset, currentOrigPath, currentPath,
+						e.getFunctionPointer());
+				}
+				else {
+					// maybe order matters?
+				}
+			}
+			else {
+				myVft.addEntry(tableOffset, parentOrigPath, parentPath, e.getFunctionPointer());
+			}
+		}
+		return myVft;
+	}
+
+	private void updateVftFromSelf(VirtualFunctionTable vft) {
+		for (Map.Entry<Integer, VirtualFunctionTableEntry> mapEntry : vft.getEntriesByTableIndex()
+				.entrySet()) {
+			int tableOffset = mapEntry.getKey();
+			VFTableEntry e = mapEntry.getValue();
+			SymbolPath origPath = e.getOriginalPath();
+			SymbolPath methodPath = e.getOverridePath();
+			String methodName = methodPath.getName();
+			for (VirtualFunctionInfo vfInfo : virtualFunctionInfo) {
+				SymbolPath selfMethodPath = vfInfo.name();
+				String selfMethodName = selfMethodPath.getName();
+				if (selfMethodName.equals(methodName)) {
+					// potential overridden method; just replace path (could be the same)
+					methodPath = selfMethodPath;
+					break;
+				}
+			}
+			vft.addEntry(tableOffset, origPath, methodPath, e.getFunctionPointer());
+		}
+	}
+
+	private void updateMainVbt() {
+		int numEntries = virtualLayoutBaseClasses.size();
+		Integer existingEntries = mainVbt.getNumEntries();
+		if (numEntries < existingEntries) {
+			// error: silent for now... not sure how we want to deal with this
+			return;
+		}
+		for (VirtualLayoutBaseClass virtualLayoutBaseClass : virtualLayoutBaseClasses) {
+			int tableOffset = virtualLayoutBaseClass.getOffetFromVbt();
+			// Value in base class is more of an index
+			ClassID baseId = virtualLayoutBaseClass.getBaseClassType().getClassId();
+			int vbtPtrOffset = virtualLayoutBaseClass.getBasePointerOffset();
+			if (vbtPtrOffset != mainVbtPtrOffset) {
+				// error
+				// ignoring for now... not sure how we want to deal with this
+				continue;
+			}
+			VBTableEntry e = mainVbt.getEntry(tableOffset);
+			if (e == null) {
+				mainVbt.addEntry(tableOffset, baseId);
+			}
+			// No need to update an existing entry in base table
+		}
+	}
+
+	// TODO: Remove?  Believe that only the main VBT should ever possibly get updated.  The others
+	//  will only get updated in size when they are the main VBT within those respective base
+	//  classes.
+	private VirtualBaseTable updateVbt(VxtManager vxtManager, ClassID baseId, VxtPtrInfo info,
+			VxtPtrInfo parentInfo) {
+		if (!(vxtManager instanceof MsftVxtManager mvxtManager)) {
+			// error
+			return null;
+		}
+		ClassID parentId;
+		List<ClassID> parentParentage;
+		if (parentInfo == null) {
+			parentId = info.baseId();
+			List<ClassID> parentage = info.parentage();
+			parentParentage = parentage.subList(0, parentage.size() - 1);
+		}
+		else {
+			parentId = baseId;
+			parentParentage = parentInfo.parentage();
+		}
+
+		Long finalOffset = info.finalOffset();
+		VirtualBaseTable myVbt = (VirtualBaseTable) finalVbtByOffset.get(finalOffset);
+		if (myVbt == null) {
+			myVbt = mvxtManager.findVbt(myId, info.parentage());
+			if (myVbt == null) {
+				return null;
+			}
+			finalVbtByOffset.put(finalOffset, myVbt);
+		}
+
+		myVbt.setPtrOffsetInClass(finalOffset);
+		VirtualBaseTable parentVbt =
+			mvxtManager.findVbt(parentId, parentParentage);
+		if (parentVbt == null) {
+			// this is an error
+			return null;
+		}
+		for (Map.Entry<Integer, VirtualBaseTableEntry> mapEntry : parentVbt.getEntriesByTableIndex()
+				.entrySet()) {
+			int tableOffset = mapEntry.getKey();
+			VBTableEntry e = mapEntry.getValue();
+			myVbt.addEntry(tableOffset, e.getClassId());
+		}
+
+		return myVbt;
 	}
 
 	/**
 	 * Provides the Virtual Base Table to be used for placing virtual bases of this class
+	 * @throws PdbException upon unrecognized vft type
 	 */
-	private VirtualBaseTable getMainVbt(VxtManager vxtManager) throws PdbException {
+	private VirtualFunctionTable getMainVft(MsftVxtManager vxtManager) throws PdbException {
-		VirtualBaseTable vbt = null;
+		if (!finalVftPtrInfoByOffset.isEmpty()) {
-		if (!finalLayoutVbts.isEmpty()) {
+			VxtPtrInfo firstVftPtrInfo = finalVftPtrInfoByOffset.firstEntry().getValue();
-			VxtPtrInfo firstVbtPtrInfo = finalLayoutVbts.firstEntry().getValue();
+			VirtualFunctionTable vft = vxtManager.findVft(myId, firstVftPtrInfo.parentage());
+			return vft;
+			// Following is for consideration for testing without a program:
+//				if (vft instanceof ProgramVirtualFunctionTable pvft) {
+//					return pvft;
+//				}
+//				else if (vft instanceof PlaceholderVirtualFunctionTable plvft) {
+//					return plvft;
+//				}
+//				else {
+//					throw new PdbException(
+//						"VFT type not expected: " + vft.getClass().getSimpleName());
+//				}
+		}
+		return null;
+	}
+
+	/**
+	 * Provides the Virtual Base Table to be used for placing virtual bases of this class
+	 * @throws PdbException upon unrecognized vbt type
+	 */
+	private VirtualBaseTable getMainVbt(MsftVxtManager vxtManager) throws PdbException {
+		if (!finalVbtPtrInfoByOffset.isEmpty()) {
+			VxtPtrInfo firstVbtPtrInfo = finalVbtPtrInfoByOffset.firstEntry().getValue();
+			VirtualBaseTable vbt = vxtManager.findVbt(myId, firstVbtPtrInfo.parentage());
+			if (vbt instanceof ProgramVirtualBaseTable pvbt) {
+				return pvbt;
+			}
+			else if (vbt instanceof PlaceholderVirtualBaseTable plvbt) {
 				List<VirtualLayoutBaseClass> reorderedVirtualBases = new ArrayList<>();
 				for (ClassID bId : depthFirstVirtualBases().keySet()) {
 					for (VirtualLayoutBaseClass base : virtualLayoutBaseClasses) {
@@ -1448,70 +1738,62 @@ public class CppCompositeType {
 						}
 					}
 				}
-			long offset = selfBaseType.getAlignedLength();
+				long off = selfBaseType.getAlignedLength();
 				for (VirtualLayoutBaseClass base : reorderedVirtualBases) {
 					CppCompositeType baseType = base.getBaseClassType();
-				addPlaceholderVirtualBaseTableEntry(vxtManager, base, offset);
+					addPlaceholderVirtualBaseTableEntry(plvbt, vxtManager, base, off);
-				offset += baseType.getSelfBaseType().getAlignedLength();
+					off += baseType.getSelfBaseType().getAlignedLength();
 				}
-			if (vxtManager instanceof MsftVxtManager mvxtManager) {
+				return plvbt;
-				VBTable table = mvxtManager.findVbt(myId, firstVbtPtrInfo.parentage());
+			}
-				if (table instanceof ProgramVirtualBaseTable pvbt) {
+			else {
-					return pvbt;
+				throw new PdbException(
+					"VBT type not expected: " + vbt.getClass().getSimpleName());
 			}
 		}
-			vbt = placeholderVirtualBaseTables.get(mainVbtPtrOffset);
+		return null;
-		}
-		return vbt;
 	}
 
-	//----------------------------------------------------------------------------------------------
+	private void addPlaceholderVirtualBaseTableEntry(PlaceholderVirtualBaseTable ptable,
-	//----------------------------------------------------------------------------------------------
+			MsftVxtManager vxtManager, VirtualLayoutBaseClass base, long baseOffset) {
-	// used by find main vbt (probably should evaluate for cleanup)
+		long basePtrOffset = base.getBasePointerOffset();
-	private void addPlaceholderVirtualBaseTableEntry(VxtManager vxtManager,
+		if (ptable.getPtrOffsetInClass() != basePtrOffset) {
-			VirtualLayoutBaseClass base, Long baseOffset) throws PdbException {
-
-		long index = base.getBasePointerOffset();
-		OwnerParentage op = vbtTableIdByOffset.get(index);
-		if (op == null) {
 			// error
 			return;
 		}
-		if (vxtManager instanceof MsftVxtManager mvxtManager) {
+		PlaceholderVirtualBaseTableEntry e = ptable.getEntry(base.getOffetFromVbt());
-			VBTable xtable = mvxtManager.findVbt(op.owner(), op.parentage());
-			if (xtable == null) {
-				int entrySize =
-					composite.getDataTypeManager().getDataOrganization().getIntegerSize();
-				PlaceholderVirtualBaseTable newTable =
-					new PlaceholderVirtualBaseTable(op.owner(), op.parentage(), entrySize);
-				xtable = newTable;
-				placeholderVirtualBaseTables.put(index, newTable);
-			}
-			if (xtable instanceof PlaceholderVirtualBaseTable ptable) {
-				VBTableEntry e = ptable.getBase(base.getOffetFromVbt());
 		if (e != null) {
+			e.setOffset(baseOffset);
 			return;
 		}
 		ClassID baseId = base.getBaseClassType().getClassId();
 		ptable.setBaseClassOffsetAndId(base.getOffetFromVbt(), baseOffset, baseId);
 	}
-		}
+
-		else {
+//	private void addVirtualFunctionTableEntry(MsftVxtManager vxtManager, int offsetInTable,
-			PlaceholderVirtualBaseTable ptable = placeholderVirtualBaseTables.get(index);
+//			SymbolPath methodPath, FunctionDefinition functionDefinition) throws PdbException {
-			if (ptable == null) {
+//		OwnerParentage op = vftTableIdByOffset.get(mainVftPtrOffset);
-				int entrySize =
+//		if (op == null) {
-					composite.getDataTypeManager().getDataOrganization().getIntegerSize();
+//			// error
-				ptable = new PlaceholderVirtualBaseTable(op.owner(), op.parentage(), entrySize);
+//			return;
-				placeholderVirtualBaseTables.put(index, ptable);
+//		}
-			}
+//		if (vxtManager instanceof MsftVxtManager mvxtManager) {
-			VBTableEntry e = ptable.getBase(base.getOffetFromVbt());
+//			VFTable xtable = mvxtManager.findVft(op.owner(), op.parentage());
-			if (e != null) {
+//			VirtualFunctionTable vft;
-				return;
+//			if (xtable != null) {
-			}
+//				if (!(xtable instanceof VirtualFunctionTable myvft)) {
-			ClassID baseId = base.getBaseClassType().getClassId();
+//					// error
-			ptable.setBaseClassOffsetAndId(base.getOffetFromVbt(), baseOffset, baseId);
+//					return;
-		}
+//				}
-	}
+//				vft = myvft;
+//			}
+//			else {
+//				vft = new PlaceholderVirtualFunctionTable((ProgramClassID) op.owner(),
+//					op.parentage(), mainVftPtrOffset.intValue());
+//			}
+//			vft.addEntry(offsetInTable, methodPath, new PointerDataType(functionDefinition));
+//		}
+//	}
 
 	/**
 	 * Returns depth-first occurrences of ClassIDs along with their parentage with the assumption
@@ -1635,12 +1917,6 @@ public class CppCompositeType {
 	//==============================================================================================
 	//==============================================================================================
 
-	/**
-	 * Record holding owner and parentage using ClassIDs.  These can be used for vxtptrs and
-	 * (possibly) also for base class info
-	 */
-	private record OwnerParentage(ClassID owner, List<ClassID> parentage) {}
-
 	/**
 	 * We understand the shallow immutability of records and that the contents of the List are
 	 * not used in comparison.  Should we convert from record to class?

Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/pdbapplicator/DefaultPdbApplicator.java

@@ -36,7 +36,8 @@ import ghidra.app.util.bin.format.pdb2.pdbreader.type.PrimitiveMsType;
 import ghidra.app.util.bin.format.pe.cli.tables.CliAbstractTableRow;
 import ghidra.app.util.importer.MessageLog;
 import ghidra.app.util.pdb.PdbCategories;
-import ghidra.app.util.pdb.classtype.*;
+import ghidra.app.util.pdb.classtype.ClassTypeManager;
+import ghidra.app.util.pdb.classtype.MsftVxtManager;
 import ghidra.framework.options.Options;
 import ghidra.program.database.data.DataTypeUtilities;
 import ghidra.program.disassemble.DisassemblerContextImpl;
@@ -206,7 +207,7 @@ public class DefaultPdbApplicator implements PdbApplicator {
 
 	//==============================================================================================
 	// If we have symbols and memory with VBTs in them, then a better VbtManager is created.
-	private VxtManager vxtManager;
+	private MsftVxtManager vxtManager;
 	private PdbRegisterNameToProgramRegisterMapper registerNameToRegisterMapper;
 
 	//==============================================================================================
@@ -370,6 +371,7 @@ public class DefaultPdbApplicator implements PdbApplicator {
 			case ALL:
 				processTypes();
 				processSymbols();
+				vxtManager.doTableLayouts(dataTypeManager);
 				break;
 			default:
 				throw new PdbException("PDB: Invalid Application Control: " +
@@ -643,16 +645,16 @@ public class DefaultPdbApplicator implements PdbApplicator {
 		if (program != null) {
 			// Currently, this must happen after symbolGroups are created.
 			MsftVxtManager msftVxtManager =
-				new MsftVxtManager(getClassTypeManager(), program);
+				new MsftVxtManager(getClassTypeManager(), program); // TODO: need to fix MsftVxtManager to work with or without a program!!!!!!!!!!
 			msftVxtManager.createVirtualTables(getRootPdbCategory(), findVirtualTableSymbols(), log,
 				monitor);
 			vxtManager = msftVxtManager;
 
 			registerNameToRegisterMapper = new PdbRegisterNameToProgramRegisterMapper(program);
 		}
-		else {
+//		else {
-			vxtManager = new VxtManager(getClassTypeManager());
+//			vxtManager = new VxtManager(getClassTypeManager());
-		}
+//		}
 		preWorkDone = true;
 	}
 
@@ -1582,7 +1584,7 @@ public class DefaultPdbApplicator implements PdbApplicator {
 	//==============================================================================================
 	// Virtual-Base/Function-Table-related methods.
 	//==============================================================================================
-	VxtManager getVxtManager() {
+	MsftVxtManager getVxtManager() {
 		return vxtManager;
 	}
 

Ghidra/Features/PDB/src/test/java/ghidra/app/util/pdb/classtype/MsftVxtManagerTest.java

@@ -30,6 +30,7 @@ import ghidra.program.model.*;
 import ghidra.program.model.address.Address;
 import ghidra.program.model.address.AddressIterator;
 import ghidra.program.model.data.*;
+import ghidra.program.model.gclass.ClassID;
 import ghidra.program.model.listing.*;
 import ghidra.program.model.mem.Memory;
 import ghidra.program.model.mem.MemoryAccessException;
@@ -57,30 +58,30 @@ public class MsftVxtManagerTest extends AbstractGenericTest {
 
 	private static int[] dummyVftMeta = new int[] { 0 };
 
-	private static ClassID A1_ID = new ProgramClassID(CategoryPath.ROOT, sp("A1NS::A1"));
+	private static ClassID A1_ID = new ClassID(CategoryPath.ROOT, sp("A1NS::A1"));
-	private static ClassID A2_ID = new ProgramClassID(CategoryPath.ROOT, sp("A2NS::A2"));
+	private static ClassID A2_ID = new ClassID(CategoryPath.ROOT, sp("A2NS::A2"));
-	private static ClassID A_ID = new ProgramClassID(CategoryPath.ROOT, sp("ANS::A"));
+	private static ClassID A_ID = new ClassID(CategoryPath.ROOT, sp("ANS::A"));
-	private static ClassID B1_ID = new ProgramClassID(CategoryPath.ROOT, sp("B1NS::B1"));
+	private static ClassID B1_ID = new ClassID(CategoryPath.ROOT, sp("B1NS::B1"));
-	private static ClassID B2_ID = new ProgramClassID(CategoryPath.ROOT, sp("B2NS::B2"));
+	private static ClassID B2_ID = new ClassID(CategoryPath.ROOT, sp("B2NS::B2"));
-	private static ClassID B_ID = new ProgramClassID(CategoryPath.ROOT, sp("BNS::B"));
+	private static ClassID B_ID = new ClassID(CategoryPath.ROOT, sp("BNS::B"));
-	private static ClassID C_ID = new ProgramClassID(CategoryPath.ROOT, sp("CNS::C"));
+	private static ClassID C_ID = new ClassID(CategoryPath.ROOT, sp("CNS::C"));
-	private static ClassID D_ID = new ProgramClassID(CategoryPath.ROOT, sp("DNS::D"));
+	private static ClassID D_ID = new ClassID(CategoryPath.ROOT, sp("DNS::D"));
-	private static ClassID E_ID = new ProgramClassID(CategoryPath.ROOT, sp("ENS::E"));
+	private static ClassID E_ID = new ClassID(CategoryPath.ROOT, sp("ENS::E"));
-	private static ClassID F_ID = new ProgramClassID(CategoryPath.ROOT, sp("FNS::F"));
+	private static ClassID F_ID = new ClassID(CategoryPath.ROOT, sp("FNS::F"));
-	private static ClassID G_ID = new ProgramClassID(CategoryPath.ROOT, sp("GNS::G"));
+	private static ClassID G_ID = new ClassID(CategoryPath.ROOT, sp("GNS::G"));
-	private static ClassID H_ID = new ProgramClassID(CategoryPath.ROOT, sp("HNS::H"));
+	private static ClassID H_ID = new ClassID(CategoryPath.ROOT, sp("HNS::H"));
-	private static ClassID I_ID = new ProgramClassID(CategoryPath.ROOT, sp("INS::I"));
+	private static ClassID I_ID = new ClassID(CategoryPath.ROOT, sp("INS::I"));
-	private static ClassID J_ID = new ProgramClassID(CategoryPath.ROOT, sp("JNS::J"));
+	private static ClassID J_ID = new ClassID(CategoryPath.ROOT, sp("JNS::J"));
-	private static ClassID K_ID = new ProgramClassID(CategoryPath.ROOT, sp("KNS::K"));
+	private static ClassID K_ID = new ClassID(CategoryPath.ROOT, sp("KNS::K"));
-	private static ClassID L_ID = new ProgramClassID(CategoryPath.ROOT, sp("LNS::L"));
+	private static ClassID L_ID = new ClassID(CategoryPath.ROOT, sp("LNS::L"));
-	private static ClassID N1_ID = new ProgramClassID(CategoryPath.ROOT, sp("N1NS::N1"));
+	private static ClassID N1_ID = new ClassID(CategoryPath.ROOT, sp("N1NS::N1"));
-	private static ClassID N2_ID = new ProgramClassID(CategoryPath.ROOT, sp("N2NS::N2"));
+	private static ClassID N2_ID = new ClassID(CategoryPath.ROOT, sp("N2NS::N2"));
-	private static ClassID M_ID = new ProgramClassID(CategoryPath.ROOT, sp("MNS::M"));
+	private static ClassID M_ID = new ClassID(CategoryPath.ROOT, sp("MNS::M"));
-	private static ClassID O1_ID = new ProgramClassID(CategoryPath.ROOT, sp("O1NS::O1"));
+	private static ClassID O1_ID = new ClassID(CategoryPath.ROOT, sp("O1NS::O1"));
-	private static ClassID O2_ID = new ProgramClassID(CategoryPath.ROOT, sp("O2NS::O2"));
+	private static ClassID O2_ID = new ClassID(CategoryPath.ROOT, sp("O2NS::O2"));
-	private static ClassID O3_ID = new ProgramClassID(CategoryPath.ROOT, sp("O3NS::O3"));
+	private static ClassID O3_ID = new ClassID(CategoryPath.ROOT, sp("O3NS::O3"));
-	private static ClassID O4_ID = new ProgramClassID(CategoryPath.ROOT, sp("O4NS::O4"));
+	private static ClassID O4_ID = new ClassID(CategoryPath.ROOT, sp("O4NS::O4"));
-	private static ClassID O_ID = new ProgramClassID(CategoryPath.ROOT, sp("ONS::O"));
+	private static ClassID O_ID = new ClassID(CategoryPath.ROOT, sp("ONS::O"));
 
 	private static Function A1NS_A1_fa1_1 = new FunctionTestDouble("A1NS::A1::fa1_1");
 	private static Function A1NS_A1_fa1_2 = new FunctionTestDouble("A1NS::A1::fa1_2");

Ghidra/Features/PDB/src/test/java/ghidra/app/util/pdb/pdbapplicator/CppCompositeTypeTest.java

@@ -65,10 +65,10 @@ public class CppCompositeTypeTest extends AbstractGenericTest {
 	private static DataType vftptr64;
 	private static DataType vbtptr32;
 	private static DataType vbtptr64;
-	private static MsftVxtManager msftVxtManager32;
+	private static MsftVxtManager vxtManager32;
-	private static MsftVxtManager msftVxtManager64;
+	private static MsftVxtManager vxtManager64;
-	private static VxtManager vxtManager32;
+	private static MsftVxtManager vxtManagerNoProgram32;
-	private static VxtManager vxtManager64;
+	private static MsftVxtManager vxtManagerNoProgram64;
 	// Note: Currently all test have expected results based on up the CLASS_HIERARCHY layout.
 	private static ObjectOrientedClassLayout classLayoutChoice =
 		ObjectOrientedClassLayout.CLASS_HIERARCHY;
@@ -116,19 +116,19 @@ public class CppCompositeTypeTest extends AbstractGenericTest {
 
 		createVbTables();
 
-		msftVxtManager32 = new MsftVxtManager(ctm32, program32);
+		vxtManager32 = new MsftVxtManager(ctm32, program32);
-		msftVxtManager64 = new MsftVxtManager(ctm64, program64);
+		vxtManager64 = new MsftVxtManager(ctm64, program64);
 		try {
-			msftVxtManager32.createVirtualTables(CategoryPath.ROOT, addressByMangledName32, log,
+			vxtManager32.createVirtualTables(CategoryPath.ROOT, addressByMangledName32, log,
 				monitor);
-			msftVxtManager64.createVirtualTables(CategoryPath.ROOT, addressByMangledName64, log,
+			vxtManager64.createVirtualTables(CategoryPath.ROOT, addressByMangledName64, log,
 				monitor);
 		}
 		catch (CancelledException e) {
 			// do nothing
 		}
-		vxtManager32 = new VxtManager(ctm32);
+		vxtManagerNoProgram32 = new MsftVxtManager(ctm32, null);
-		vxtManager64 = new VxtManager(ctm64);
+		vxtManagerNoProgram64 = new MsftVxtManager(ctm64, null);
 
 	}
 
@@ -227,8 +227,8 @@ public class CppCompositeTypeTest extends AbstractGenericTest {
 		private FunctionManager myFunctionManager;
 
 		private MyStubProgram(Memory mem, FunctionManager fm) {
-			this.myMemory = mem;
+			myMemory = mem;
-			this.myFunctionManager = fm;
+			myFunctionManager = fm;
 		}
 
 		@Override
@@ -6994,7 +6994,7 @@ public class CppCompositeTypeTest extends AbstractGenericTest {
 	public void test_32bit_vbt() throws Exception {
 		boolean is64Bit = false;
 		MyTestDummyDataTypeManager dtm = dtm32;
-		VxtManager vxtManager = msftVxtManager32;
+		MsftVxtManager vxtManager = vxtManager32;
 		List<String> expectedResults = new ArrayList<>();
 		expectedResults.add(getExpectedA_32());
 		expectedResults.add(getExpectedC_32());
@@ -7037,7 +7037,7 @@ public class CppCompositeTypeTest extends AbstractGenericTest {
 	public void test_32bit_speculative() throws Exception {
 		boolean is64Bit = false;
 		MyTestDummyDataTypeManager dtm = dtm32;
-		VxtManager vxtManager = vxtManager32;
+		MsftVxtManager vxtManager = vxtManagerNoProgram32;
 		List<String> expectedResults = new ArrayList<>();
 		expectedResults.add(getSpeculatedA_32());
 		expectedResults.add(getSpeculatedC_32());
@@ -7080,7 +7080,7 @@ public class CppCompositeTypeTest extends AbstractGenericTest {
 	public void test_64bit_vbt() throws Exception {
 		boolean is64Bit = true;
 		MyTestDummyDataTypeManager dtm = dtm64;
-		VxtManager vxtManager = msftVxtManager64;
+		MsftVxtManager vxtManager = vxtManager64;
 		List<String> expectedResults = new ArrayList<>();
 		expectedResults.add(getExpectedA_64());
 		expectedResults.add(getExpectedC_64());
@@ -7123,7 +7123,7 @@ public class CppCompositeTypeTest extends AbstractGenericTest {
 	public void test_64bit_speculative() throws Exception {
 		boolean is64Bit = true;
 		MyTestDummyDataTypeManager dtm = dtm64;
-		VxtManager vxtManager = vxtManager64;
+		MsftVxtManager vxtManager = vxtManagerNoProgram64;
 		List<String> expectedResults = new ArrayList<>();
 		expectedResults.add(getSpeculatedA_64());
 		expectedResults.add(getSpeculatedC_64());
@@ -7159,7 +7159,7 @@ public class CppCompositeTypeTest extends AbstractGenericTest {
 	}
 
 	private void createAndTestStructures(boolean is64Bit, DataTypeManager dtm,
-			VxtManager vxtManager, List<String> expectedResults) throws Exception {
+			MsftVxtManager vxtManager, List<String> expectedResults) throws Exception {
 
 		Iterator<String> iter = expectedResults.iterator();
 		String expected;

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/gclass/ClassID.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package ghidra.app.util.pdb.classtype;
+package ghidra.program.model.gclass;
 
 import java.util.Objects;
 
@@ -21,10 +21,10 @@ import ghidra.app.util.SymbolPath;
 import ghidra.program.model.data.CategoryPath;
 
 /**
- * Unique ID of a ProgramClassType.  Not sure if there will be different implementation for
+ * Unique ID of a Program Class Type.  Not sure if there will be different implementation for
- *  definition vs. compiled vs. program vs. debug.  See ClassID.
+ *  definition vs. compiled vs. program vs. debug.
  */
-public class ProgramClassID implements ClassID {
+public class ClassID implements Comparable<ClassID> {
 	// All of the internals of this might change, but we need something to work with for now.
 	//  It might end up being a hash/guid/long value.
 	// We were trying to use DataTypePath, but that doesn't work in light of conflicts, as we
@@ -32,14 +32,14 @@ public class ProgramClassID implements ClassID {
 	//  DataTypePath changed out from underneath us).
 	private final SymbolPath symbolPath;
 	private final CategoryPath categoryPath;
-	static final int classNameHash = Objects.hash(ProgramClassID.class.getName());
+	static final int classNameHash = Objects.hash(ClassID.class.getName());
 
 	/**
 	 * Constructor
 	 * @param categoryPath the category path for the claass
 	 * @param symbolPath the symbol path for the class
 	 */
-	public ProgramClassID(CategoryPath categoryPath, SymbolPath symbolPath) {
+	public ClassID(CategoryPath categoryPath, SymbolPath symbolPath) {
 		this.categoryPath = categoryPath;
 		this.symbolPath = symbolPath;
 	}
@@ -69,11 +69,6 @@ public class ProgramClassID implements ClassID {
 //		return dataTypeID;
 //	}
 
-	@Override
-	public int getClassNameHash() {
-		return classNameHash;
-	}
-
 	@Override
 	public String toString() {
 		return String.format("%s --- %s", categoryPath, symbolPath);
@@ -82,18 +77,11 @@ public class ProgramClassID implements ClassID {
 	@Override
 	public int compareTo(ClassID o) {
 		int ret;
-		if (!(o instanceof ProgramClassID oID)) {
+		ret = symbolPath.compareTo(o.symbolPath);
-			ret = getClassNameHash() - o.getClassNameHash();
-			if (ret != 0) {
-				throw new AssertionError("Logic problem with compareTo");
-			}
-			return ret;
-		}
-		ret = symbolPath.compareTo(oID.symbolPath);
 		if (ret != 0) {
 			return ret;
 		}
-		return categoryPath.compareTo(oID.categoryPath);
+		return categoryPath.compareTo(o.categoryPath);
 	}
 
 	@Override
@@ -112,7 +100,7 @@ public class ProgramClassID implements ClassID {
 		if (getClass() != obj.getClass()) {
 			return false;
 		}
-		ProgramClassID other = (ProgramClassID) obj;
+		ClassID other = (ClassID) obj;
 		return Objects.equals(categoryPath, other.categoryPath) &&
 			Objects.equals(symbolPath, other.symbolPath);
 	}

Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/gclass/ClassUtils.java

@@ -15,6 +15,7 @@
  */
 package ghidra.program.model.gclass;
 
+import ghidra.app.util.SymbolPath;
 import ghidra.program.model.data.*;
 
 /**
@@ -40,6 +41,11 @@ public class ClassUtils {
 	 */
 	public static final PointerDataType VXPTR_TYPE = new PointerDataType();
 
+	/**
+	 * The standard prefix used for the special symbol.  Private for now.
+	 */
+	private static final String VTABLE_PREFIX = "VTABLE_";
+
 	/**
 	 * private constructor -- no instances
 	 */
@@ -54,8 +60,27 @@ public class ClassUtils {
 	 */
 	public static CategoryPath getClassInternalsPath(Composite composite) {
 		DataTypePath dtp = composite.getDataTypePath();
-		return new CategoryPath(new CategoryPath(dtp.getCategoryPath(), dtp.getDataTypeName()),
+		return getClassInternalsPath(dtp.getCategoryPath(), dtp.getDataTypeName());
-			"!internal");
+	}
+
+	/**
+	 * Returns the category for class internals for the ClassID
+	 * @param id the class ID
+	 * @return the category path
+	 */
+	public static CategoryPath getClassInternalsPath(ClassID id) {
+		CategoryPath cp = recurseGetCategoryPath(id.getCategoryPath(), id.getSymbolPath());
+		return cp.extend("!internal");
+	}
+
+	/**
+	 * Returns the category for class internals
+	 * @param path the category path of the class composite
+	 * @param className the name of the class
+	 * @return the category path
+	 */
+	public static CategoryPath getClassInternalsPath(CategoryPath path, String className) {
+		return new CategoryPath(new CategoryPath(path, className), "!internal");
 	}
 
 	/**
@@ -92,4 +117,46 @@ public class ClassUtils {
 		return composite;
 	}
 
+	/**
+	 * Provides the standard special name for a virtual table (e.g., vbtable, vftable) that is
+	 * keyed off of by the Decompiler during flattening and replacing of types within a class
+	 * structure.  More details to come
+	 * @param ptrOffsetInClass the offset of the special field within the class
+	 * @return the special name
+	 */
+	public static String getSpecialVxTableName(long ptrOffsetInClass) {
+		return String.format("%s%08x", VTABLE_PREFIX, ptrOffsetInClass);
+	}
+
+	public static DataType getVftDefaultEntry(DataTypeManager dtm) {
+		return new PointerDataType(dtm);
+	}
+
+	public static DataType getVbtDefaultEntry(DataTypeManager dtm) {
+		return new IntegerDataType(dtm);
+	}
+
+	public static int getVftEntrySize(DataTypeManager dtm) {
+		return dtm.getDataOrganization().getPointerSize();
+	}
+
+	public static int getVbtEntrySize(DataTypeManager dtm) {
+		return dtm.getDataOrganization().getIntegerSize();
+	}
+
+	/**
+	 * Method to get a category path from a base category path and symbol path
+	 * @param category the {@ink CategoryPath} on which to build
+	 * @param symbolPath the current {@link SymbolPath} from which the current name is pulled.
+	 * @return the new {@link CategoryPath} for the recursion level
+	 */
+	private static CategoryPath recurseGetCategoryPath(CategoryPath category,
+			SymbolPath symbolPath) {
+		SymbolPath parent = symbolPath.getParent();
+		if (parent != null) {
+			category = recurseGetCategoryPath(category, parent);
+		}
+		return new CategoryPath(category, symbolPath.getName());
+	}
+
 }