GP-2295 - fixes and debug code for a history actions stack trace

Ghidra/Features/Base/src/main/java/ghidra/app/nav/Navigatable.java

@@ -90,7 +90,7 @@ public interface Navigatable {
 	 * Return true if this Navigatable is part of the "dynamic analysis" or "debugger" user
 	 * interface.
 	 *
-	 * @return tre if this Navigatable is "dynamic"
+	 * @return true if this Navigatable is "dynamic"
 	 */
 	default public boolean isDynamic() {
 		return false;
@@ -166,9 +166,9 @@ public interface Navigatable {
 	public void removeNavigatableListener(NavigatableRemovalListener listener);
 
 	/**
-	 * Returns true if this navigatable is no longer valid, false if it is still good
+	 * Returns true if this navigatable is no longer valid
 	 *
-	 * @return true if this navigatable is no longer valid, false if it is still good
+	 * @return true if this navigatable is no longer valid
 	 */
 	public boolean isDisposed();
 

Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/navigation/NavigationHistoryPlugin.java

@@ -627,12 +627,18 @@ public class NavigationHistoryPlugin extends Plugin
 		}
 
 		private Function getPreviousStartFunction(Navigatable navigatable) {
-			ProgramLocation location = navigatable.getLocation();
+			ProgramLocation location = getProgramLocation(navigatable);
 			if (location == null) {
 				return null;
 			}
 
 			Address currentAddress = location.getAddress();
+			Program program = location.getProgram();
+			FunctionManager functionManager = program.getFunctionManager();
+			return functionManager.getFunctionContaining(currentAddress);
+		}
+
+		private ProgramLocation getProgramLocation(Navigatable navigatable) {
 
 			//
 			// The active component may still be showing the previously loaded function, instead
@@ -643,19 +649,49 @@ public class NavigationHistoryPlugin extends Plugin
 			// that the navigation actions will sometimes feel inconsistent, depending upon
 			// what view is focused.
 			//
-			DockingWindowManager manager = DockingWindowManager.getActiveInstance();
-			ComponentProvider provider = manager.getActiveComponentProvider();
-			if (provider instanceof Navigatable) {
-				LocationMemento memento = ((Navigatable) provider).getMemento();
-				ProgramLocation otherLocation = memento.getProgramLocation();
-				if (otherLocation != null) {
-					currentAddress = otherLocation.getAddress();
+			DockingWindowManager dwm = DockingWindowManager.getActiveInstance();
+			ComponentProvider activeProvider = dwm.getActiveComponentProvider();
+			if (activeProvider instanceof Navigatable) {
+				Navigatable activeNavigatable = (Navigatable) activeProvider;
+				LocationMemento memento = activeNavigatable.getMemento();
+				ProgramLocation location =
+					validateProgramLocation(activeNavigatable, memento.getProgramLocation());
+				if (location != null) {
+					// prefer the active natigatable's location
+					return location;
 				}
 			}
 
+			ProgramLocation location = navigatable.getLocation();
+			return validateProgramLocation(navigatable, location);
+		}
+
+		private ProgramLocation validateProgramLocation(Navigatable navigatable,
+				ProgramLocation location) {
+			if (location == null) {
+				return null;
+			}
+			if (isClosedProgram(navigatable, location)) {
+				return null;
+			}
+			return location;
+		}
+
+		// TODO debug code that can go away if we find the source of the lingering program location
+		// being used that causes the program closed exception
+		private boolean isClosedProgram(Navigatable navigatable, ProgramLocation location) {
 			Program program = location.getProgram();
-			FunctionManager functionManager = program.getFunctionManager();
-			return functionManager.getFunctionContaining(currentAddress);
+			if (program.isClosed()) {
+
+				Msg.showError(this, null, "Closed Program",
+					"The Navigation History Plugin is using a closed program.\n" + "Program: " +
+						program.getName() + "Navigatable: " +
+						navigatable.getClass().getSimpleName() + "\n" + "Location: " +
+						location.getClass().getSimpleName() + " @ " + location.getAddress());
+				return true;
+			}
+
+			return false;
 		}
 
 		void remove(LocationMemento location) {

Ghidra/Features/ByteViewer/src/main/java/ghidra/app/plugin/core/byteviewer/ByteViewerPlugin.java

@@ -30,28 +30,17 @@ import ghidra.util.SystemUtilities;
 /**
  * Visible Plugin to show ByteBlock data in various formats.
  */
-@PluginInfo(
-	status = PluginStatus.RELEASED,
-	packageName = CorePluginPackage.NAME,
-	category = PluginCategoryNames.BYTE_VIEWER,
-	shortDescription = "Displays bytes in memory",
-	description = "Provides a component for showing the bytes in memory.  " +
+@PluginInfo(status = PluginStatus.RELEASED, packageName = CorePluginPackage.NAME, category = PluginCategoryNames.BYTE_VIEWER, shortDescription = "Displays bytes in memory", description = "Provides a component for showing the bytes in memory.  " +
 	"Additional plugins provide capabilites for this plugin" +
 	" to show the bytes in various formats (e.g., hex, octal, decimal)." +
-		"  The hex format plugin is loaded by default when this plugin is loaded.",
-	servicesRequired = {
+	"  The hex format plugin is loaded by default when this plugin is loaded.", servicesRequired = {
 		ProgramManager.class, GoToService.class, NavigationHistoryService.class,
-		ClipboardService.class,
-	},
-	eventsConsumed = {
-		ProgramLocationPluginEvent.class, ProgramActivatedPluginEvent.class,
-		ProgramSelectionPluginEvent.class, ProgramHighlightPluginEvent.class,
-		ProgramClosedPluginEvent.class, ByteBlockChangePluginEvent.class,
-	},
-	eventsProduced = {
+		ClipboardService.class, }, eventsConsumed = { ProgramLocationPluginEvent.class,
+			ProgramActivatedPluginEvent.class, ProgramSelectionPluginEvent.class,
+			ProgramHighlightPluginEvent.class, ProgramClosedPluginEvent.class,
+			ByteBlockChangePluginEvent.class, }, eventsProduced = {
 				ProgramLocationPluginEvent.class, ProgramSelectionPluginEvent.class,
-		ByteBlockChangePluginEvent.class,
-	})
+				ByteBlockChangePluginEvent.class, })
 public class ByteViewerPlugin extends AbstractByteViewerPlugin<ProgramByteViewerComponentProvider> {
 
 	public ByteViewerPlugin(PluginTool tool) {
@@ -73,6 +62,7 @@ public class ByteViewerPlugin extends AbstractByteViewerPlugin<ProgramByteViewer
 
 		if (event instanceof ProgramActivatedPluginEvent) {
 			currentProgram = ((ProgramActivatedPluginEvent) event).getActiveProgram();
+			currentLocation = null;
 		}
 		else if (event instanceof ProgramLocationPluginEvent) {
 			currentLocation = ((ProgramLocationPluginEvent) event).getLocation();
@@ -131,8 +121,7 @@ public class ByteViewerPlugin extends AbstractByteViewerPlugin<ProgramByteViewer
 	}
 
 	@Override
-	public void highlightChanged(ByteViewerComponentProvider provider,
-			ProgramSelection highlight) {
+	public void highlightChanged(ByteViewerComponentProvider provider, ProgramSelection highlight) {
 		if (provider == connectedProvider) {
 			tool.firePluginEvent(new ProgramHighlightPluginEvent(getName(), highlight,
 				connectedProvider.getProgram()));

Ghidra/Features/Decompiler/src/main/java/ghidra/app/plugin/core/decompile/DecompilePlugin.java

@@ -74,9 +74,15 @@ public class DecompilePlugin extends Plugin {
 	 * or when switching program tabs.
 	 */
 	SwingUpdateManager delayedLocationUpdateMgr = new SwingUpdateManager(200, 200, () -> {
-		if (currentLocation != null) {
-			connectedProvider.setLocation(currentLocation, null);
+		if (currentLocation == null) {
+			return;
 		}
+
+		Program locationProgram = currentLocation.getProgram();
+		if (locationProgram.isClosed()) {
+			return; // not sure if this can happen
+		}
+		connectedProvider.setLocation(currentLocation, null);
 	});
 
 	public DecompilePlugin(PluginTool tool) {

Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/FGProvider.java

@@ -497,6 +497,13 @@ public class FGProvider extends VisualGraphComponentProvider<FGVertex, FGEdge, F
 			return;
 		}
 
+		Program program = newLocation.getProgram();
+		if (program.isClosed()) {
+			// this method is called from an update manager, which means that the callback may
+			// happen after the notification that the program was closed
+			return;
+		}
+
 		setLocationNow(newLocation);
 	}