GP-4515: Loading ExtensionPoints on-demand for faster startup

Ghidra/Debug/Debugger/src/main/java/ghidra/app/plugin/core/debug/gui/action/AutoMapSpec.java

@@ -47,6 +47,7 @@ public interface AutoMapSpec extends ExtensionPoint {
 
 		private Private() {
 			ClassSearcher.addChangeListener(classListener);
+			classesChanged(null);
 		}
 
 		private synchronized void classesChanged(ChangeEvent evt) {

Ghidra/Debug/Debugger/src/main/java/ghidra/app/plugin/core/debug/gui/action/AutoReadMemorySpec.java

@@ -45,6 +45,7 @@ public interface AutoReadMemorySpec extends ExtensionPoint {
 
 		private Private() {
 			ClassSearcher.addChangeListener(classListener);
+			classesChanged(null);
 		}
 
 		private synchronized void classesChanged(ChangeEvent evt) {

Ghidra/Features/Base/src/main/java/ghidra/GhidraRun.java

@@ -89,7 +89,7 @@ public class GhidraRun implements GhidraLaunchable {
 				String projectPath = processArguments(args);
 				openProject(projectPath);
 				
-				log.info("Ghidra starup complete (" + GhidraLauncher.getMillisecondsFromLaunch() +
+				log.info("Ghidra startup complete (" + GhidraLauncher.getMillisecondsFromLaunch() +
 					" ms)");
 			});
 		};

Ghidra/Features/Base/src/main/java/ghidra/app/plugin/runtimeinfo/RuntimeInfoProvider.java

@@ -27,8 +27,7 @@ import generic.jar.ResourceFile;
 import ghidra.GhidraClassLoader;
 import ghidra.framework.Application;
 import ghidra.util.Disposable;
-import ghidra.util.classfinder.ClassSearcher;
+import ghidra.util.classfinder.*;
-import ghidra.util.classfinder.ExtensionPoint;
 
 /**
  * A dialog that shows useful runtime information
@@ -188,13 +187,32 @@ class RuntimeInfoProvider extends ReusableDialogComponentProvider {
 	 * loaded.
 	 */
 	private void addExtensionPoints() {
-		Map<String, String> map = ClassSearcher.getClasses(ExtensionPoint.class)
+		JTabbedPane epTabbedPane = new JTabbedPane();
+		tabbedPane.add("Extension Points", epTabbedPane);
+
+		// Discovered Potential Extension Points
+		Map<String, String> map = ClassSearcher.getExtensionPointInfo()
 				.stream()
-				.collect(Collectors.toMap(e -> e.getName(),
+				.collect(Collectors.toMap(ClassFileInfo::name, ClassFileInfo::path));
-					e -> ClassSearcher.getExtensionPointName(e.getName())));
+		String name = "Extension Point Info (%d)".formatted(map.size());
-		String name = "Extension Points";
+		epTabbedPane.add(
-		tabbedPane.add(new MapTablePanel<String, String>(name, map, "Name", "Extension Point", 400,
+			new MapTablePanel<String, String>(name, map, "Name", "Path", 400, true, plugin), name);
-			true, plugin), name);
+		
+		// Loaded Extension Points
+		map = ClassSearcher.getLoaded()
+				.stream()
+				.collect(Collectors.toMap(ClassFileInfo::name, ClassFileInfo::suffix));
+		name = "Loaded (%d)".formatted(map.size());
+		epTabbedPane.add(
+			new MapTablePanel<String, String>(name, map, "Name", "Type", 400, true, plugin), name);
+		
+		// False Positive Extension Points
+		map = ClassSearcher.getFalsePositives()
+				.stream()
+				.collect(Collectors.toMap(ClassFileInfo::name, ClassFileInfo::suffix));
+		name = "False Positives (%d)".formatted(map.size());
+		epTabbedPane.add(
+			new MapTablePanel<String, String>(name, map, "Name", "Type", 400, true, plugin), name);
 	}
 
 	/**

Ghidra/Features/Base/src/main/java/ghidra/app/util/headless/AnalyzeHeadless.java

@@ -28,6 +28,7 @@ import ghidra.framework.*;
 import ghidra.framework.model.DomainFolder;
 import ghidra.framework.protocol.ghidra.Handler;
 import ghidra.util.Msg;
+import ghidra.util.classfinder.ClassSearcher;
 import ghidra.util.exception.InvalidInputException;
 
 /**
@@ -119,6 +120,7 @@ public class AnalyzeHeadless implements GhidraLaunchable {
 
 		Msg.info(AnalyzeHeadless.class,
 			"Headless startup complete (" + GhidraLauncher.getMillisecondsFromLaunch() + " ms)");
+		ClassSearcher.logStatistics();
 
 		// Do the headless processing
 		try {

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

@@ -82,9 +82,8 @@ public class FieldNavigator implements ButtonPressedListener, FieldMouseHandlerS
 			new HashMap<Class<?>, List<FieldMouseHandler>>();
 
 		// find all instances of AnnotatedString
-		List<FieldMouseHandlerExtension> instances =
+		List<FieldMouseHandler> instances = ClassSearcher.getInstances(FieldMouseHandler.class);
-			ClassSearcher.getInstances(FieldMouseHandlerExtension.class);
+		for (FieldMouseHandler fieldMouseHandler : instances) {
-		for (FieldMouseHandlerExtension fieldMouseHandler : instances) {
 			addHandler(map, fieldMouseHandler);
 		}
 

Ghidra/Features/Base/src/main/java/ghidra/test/AbstractGhidraHeadlessIntegrationTest.java

@@ -21,6 +21,7 @@ import java.io.File;
 import java.io.IOException;
 import java.util.*;
 
+import org.apache.commons.collections4.BidiMap;
 import org.junit.BeforeClass;
 
 import docking.test.AbstractDockingTest;
@@ -45,6 +46,7 @@ import ghidra.program.model.symbol.Namespace;
 import ghidra.program.model.symbol.Symbol;
 import ghidra.program.util.*;
 import ghidra.util.Msg;
+import ghidra.util.classfinder.ClassFileInfo;
 import ghidra.util.classfinder.ClassSearcher;
 import ghidra.util.exception.RollbackException;
 import junit.framework.AssertionFailedError;
@@ -608,29 +610,27 @@ public abstract class AbstractGhidraHeadlessIntegrationTest extends AbstractDock
 
 		ServiceManager serviceManager = (ServiceManager) getInstanceField("serviceMgr", tool);
 
-		List<Class<?>> extentions =
+		Map<String, Set<ClassFileInfo>> extensionPointSuffixToInfoMap =
-			(List<Class<?>>) getInstanceField("extensionPoints", ClassSearcher.class);
+			(Map<String, Set<ClassFileInfo>>) getInstanceField("extensionPointSuffixToInfoMap",
-		Set<Class<?>> set = new HashSet<>(extentions);
+				ClassSearcher.class);
-		Iterator<Class<?>> iterator = set.iterator();
+		BidiMap<ClassFileInfo, Class<?>> loadedCache =
-		while (iterator.hasNext()) {
+			(BidiMap<ClassFileInfo, Class<?>>) getInstanceField("loadedCache", ClassSearcher.class);
-			Class<?> c = iterator.next();
+		String suffix = ClassSearcher.getExtensionPointSuffix(service.getSimpleName());
-			if (service.isAssignableFrom(c)) {
+
-				iterator.remove();
+		if (suffix != null) {
-				T instance = tool.getService(service);
+			Set<ClassFileInfo> serviceSet = extensionPointSuffixToInfoMap.get(suffix);
-				serviceManager.removeService(service, instance);
+			assertNotNull(serviceSet);
-			}
+			serviceSet.clear();
+			ClassFileInfo info = new ClassFileInfo("", replacement.getClass().getName(), suffix);
+			serviceSet.add(info);
+			loadedCache.put(info, replacement.getClass());
 		}
 
 		T instance = tool.getService(service);
 		if (instance != null) {
 			serviceManager.removeService(service, instance);
 		}
-
-		set.add(replacement.getClass());
 		serviceManager.addService(service, replacement);
-
-		List<Class<?>> newExtensionPoints = new ArrayList<>(set);
-		setInstanceField("extensionPoints", ClassSearcher.class, newExtensionPoints);
 	}
 
 //==================================================================================================

Ghidra/Features/Base/src/main/java/ghidra/util/GhidraJarBuilder.java

@@ -26,7 +26,6 @@ import generic.jar.*;
 import ghidra.GhidraApplicationLayout;
 import ghidra.GhidraLaunchable;
 import ghidra.framework.*;
-import ghidra.util.classfinder.ClassFinder;
 import ghidra.util.classfinder.ClassSearcher;
 import ghidra.util.exception.AssertException;
 import ghidra.util.exception.CancelledException;
@@ -617,7 +616,7 @@ public class GhidraJarBuilder implements GhidraLaunchable {
 			if (clazz == null) {
 				System.out.println("Couldn't load " + path);
 			}
-			else if (ClassFinder.isClassOfInterest(clazz)) {
+			else if (ClassSearcher.isClassOfInterest(clazz)) {
 				extensionPointClasses.add(clazz.getName());
 			}
 		}

Ghidra/Features/Base/src/test.slow/java/ghidra/app/plugin/core/analysis/AnalysisOptions2Test.java

@@ -19,12 +19,12 @@ import static org.junit.Assert.*;
 
 import java.awt.Color;
 import java.awt.Component;
-import java.util.ArrayList;
+import java.util.*;
-import java.util.List;
 
 import javax.swing.JPanel;
 import javax.swing.table.TableModel;
 
+import org.apache.commons.collections4.BidiMap;
 import org.junit.*;
 
 import docking.ActionContext;
@@ -44,6 +44,7 @@ import ghidra.program.model.listing.Program;
 import ghidra.test.AbstractGhidraHeadedIntegrationTest;
 import ghidra.test.TestEnv;
 import ghidra.util.ColorUtils;
+import ghidra.util.classfinder.ClassFileInfo;
 import ghidra.util.classfinder.ClassSearcher;
 import ghidra.util.exception.AssertException;
 import ghidra.util.exception.CancelledException;
@@ -99,7 +100,7 @@ public class AnalysisOptions2Test extends AbstractGhidraHeadedIntegrationTest {
 		// The old option's default value should not be applied to the new option
 		//
 
-		installAnalyzer(NotReplacingTestAnalyzerStub.class);
+		installAnalyzer(NotReplacingTestStubAnalyzer.class);
 
 		// install old options; the default value will not be used in the new option
 		installOldOptions(OLD_OPTION_DEFAULT_VALUE);
@@ -122,7 +123,7 @@ public class AnalysisOptions2Test extends AbstractGhidraHeadedIntegrationTest {
 		// The old option's default value should not be applied to the new option
 		//
 
-		installAnalyzer(NotReplacingTestAnalyzerStub.class);
+		installAnalyzer(NotReplacingTestStubAnalyzer.class);
 
 		// install old options; the default value will not be used in the new option
 		installOldOptions(OLD_OPTION_DEFAULT_VALUE);
@@ -149,7 +150,7 @@ public class AnalysisOptions2Test extends AbstractGhidraHeadedIntegrationTest {
 		// The old option's non-default value should be applied to the new option
 		//
 
-		installAnalyzer(UseOldValueTestAnalyzerStub.class);
+		installAnalyzer(UseOldValueTestStubAnalyzer.class);
 
 		// install old options; the default value will not be used in the new option
 		installOldOptions(OLD_OPTION_DEFAULT_VALUE);
@@ -175,7 +176,7 @@ public class AnalysisOptions2Test extends AbstractGhidraHeadedIntegrationTest {
 		// new option has a non-default
 		//
 
-		installAnalyzer(UseOldValueTestAnalyzerStub.class);
+		installAnalyzer(UseOldValueTestStubAnalyzer.class);
 
 		// install old options; the default value will not be used in the new option
 		installOldOptions(OLD_OPTION_DEFAULT_VALUE);
@@ -205,7 +206,7 @@ public class AnalysisOptions2Test extends AbstractGhidraHeadedIntegrationTest {
 		// has a different object type than the old option.
 		//
 
-		installAnalyzer(ConvertValueTypeTestAnalyzerStub.class);
+		installAnalyzer(ConvertValueTypeTestStubAnalyzer.class);
 
 		// install old options; the default value will not be used in the new option
 		installOldOptions(OLD_OPTION_DEFAULT_VALUE);
@@ -233,12 +234,12 @@ public class AnalysisOptions2Test extends AbstractGhidraHeadedIntegrationTest {
 
 	private void installOldOptions(Object value) {
 		Options programAnalysisOptions = program.getOptions(Program.ANALYSIS_PROPERTIES);
-		Options options = programAnalysisOptions.getOptions(AbstractTestAnalyzerStub.NAME);
+		Options options = programAnalysisOptions.getOptions(AbstractTestStubAnalyzer.NAME);
 		AbstractOptions abstractOptions = (AbstractOptions) getInstanceField("options", options);
 
 		// this call creates an 'unregistered option'
 		String fullOptionName =
-			"Analyzers." + AbstractTestAnalyzerStub.NAME + '.' + OLD_OPTION_NAME;
+			"Analyzers." + AbstractTestStubAnalyzer.NAME + '.' + OLD_OPTION_NAME;
 		Option option = abstractOptions.getOption(fullOptionName, OptionType.getOptionType(value),
 			OLD_OPTION_DEFAULT_VALUE);
 
@@ -249,16 +250,23 @@ public class AnalysisOptions2Test extends AbstractGhidraHeadedIntegrationTest {
 		});
 	}
 
+	@SuppressWarnings("unchecked")
 	private void installAnalyzer(Class<? extends Analyzer> analyzer) {
 
-		@SuppressWarnings("unchecked")
+		Map<String, Set<ClassFileInfo>> extensionPointSuffixToInfoMap =
-		List<Class<?>> extensions =
+			(Map<String, Set<ClassFileInfo>>) getInstanceField("extensionPointSuffixToInfoMap",
-			(List<Class<?>>) getInstanceField("extensionPoints", ClassSearcher.class);
+				ClassSearcher.class);
+		BidiMap<ClassFileInfo, Class<?>> loadedCache =
+			(BidiMap<ClassFileInfo, Class<?>>) getInstanceField("loadedCache", ClassSearcher.class);
 
 		// remove any traces of previous test runs
-		extensions.removeIf(c -> c.getSimpleName().contains("TestAnalyzerStub"));
+		Set<ClassFileInfo> analyzerSet = extensionPointSuffixToInfoMap.get("Analyzer");
+		assertNotNull(analyzerSet);
 
-		extensions.add(analyzer);
+		analyzerSet.removeIf(c -> c.name().contains("TestStubAnalyzer"));
+		ClassFileInfo info = new ClassFileInfo("", analyzer.getName(), "Analyzer");
+		analyzerSet.add(info);
+		loadedCache.put(info, analyzer);
 	}
 
 	private AnalysisOptionsDialog invokeAnalysisDialog() {
@@ -284,19 +292,19 @@ public class AnalysisOptions2Test extends AbstractGhidraHeadedIntegrationTest {
 
 	private void changeNewOption(String newValue) {
 		Options options = program.getOptions(Program.ANALYSIS_PROPERTIES);
-		Options analyzerOptions = options.getOptions(AbstractTestAnalyzerStub.NAME);
+		Options analyzerOptions = options.getOptions(AbstractTestStubAnalyzer.NAME);
 
 		tx(program, () -> analyzerOptions.putObject(NEW_OPTION_NAME, newValue));
 	}
 
 	private void changeOldOption(String newValue) {
 		Options programAnalysisOptions = program.getOptions(Program.ANALYSIS_PROPERTIES);
-		Options options = programAnalysisOptions.getOptions(AbstractTestAnalyzerStub.NAME);
+		Options options = programAnalysisOptions.getOptions(AbstractTestStubAnalyzer.NAME);
 		AbstractOptions abstractOptions = (AbstractOptions) getInstanceField("options", options);
 
 		// this call creates an 'unregistered option'
 		String fullOptionName =
-			"Analyzers." + AbstractTestAnalyzerStub.NAME + '.' + OLD_OPTION_NAME;
+			"Analyzers." + AbstractTestStubAnalyzer.NAME + '.' + OLD_OPTION_NAME;
 		Option option = abstractOptions.getOption(fullOptionName,
 			OptionType.getOptionType(OLD_OPTION_DEFAULT_VALUE), OLD_OPTION_DEFAULT_VALUE);
 
@@ -309,14 +317,14 @@ public class AnalysisOptions2Test extends AbstractGhidraHeadedIntegrationTest {
 
 	private void assertOldValueRemoved() {
 		Options options = program.getOptions(Program.ANALYSIS_PROPERTIES);
-		Options analyzerOptions = options.getOptions(AbstractTestAnalyzerStub.NAME);
+		Options analyzerOptions = options.getOptions(AbstractTestStubAnalyzer.NAME);
 		assertFalse("Old option not removed", analyzerOptions.contains(OLD_OPTION_NAME));
 	}
 
 	private void assertOnlyNewOptionsInUi() {
 
 		// click our analyzer in the list of options
-		selectAnalyzer(AbstractTestAnalyzerStub.NAME);
+		selectAnalyzer(AbstractTestStubAnalyzer.NAME);
 
 		// get the panel of options
 		JPanel panel =
@@ -340,7 +348,7 @@ public class AnalysisOptions2Test extends AbstractGhidraHeadedIntegrationTest {
 
 	private void assertOptionValue(String optionName, Object defaultValue) {
 		Options options = program.getOptions(Program.ANALYSIS_PROPERTIES);
-		Options analyzerOptions = options.getOptions(AbstractTestAnalyzerStub.NAME);
+		Options analyzerOptions = options.getOptions(AbstractTestStubAnalyzer.NAME);
 		Object value = analyzerOptions.getObject(optionName, null);
 		assertEquals("Option value is not as expected for '" + optionName + "'", defaultValue,
 			value);
@@ -387,7 +395,7 @@ public class AnalysisOptions2Test extends AbstractGhidraHeadedIntegrationTest {
 // Inner Classes
 //==================================================================================================
 
-	public static abstract class AbstractTestAnalyzerStub implements Analyzer {
+	public static abstract class AbstractTestStubAnalyzer implements Analyzer {
 
 		protected AnalysisOptionsUpdater updater = new AnalysisOptionsUpdater();
 
@@ -472,9 +480,9 @@ public class AnalysisOptions2Test extends AbstractGhidraHeadedIntegrationTest {
 		}
 	}
 
-	public static class NotReplacingTestAnalyzerStub extends AbstractTestAnalyzerStub {
+	public static class NotReplacingTestStubAnalyzer extends AbstractTestStubAnalyzer {
 
-		public NotReplacingTestAnalyzerStub() {
+		public NotReplacingTestStubAnalyzer() {
 			super();
 
 			updater.registerReplacement(NEW_OPTION_NAME, OLD_OPTION_NAME, oldValue -> {
@@ -485,9 +493,9 @@ public class AnalysisOptions2Test extends AbstractGhidraHeadedIntegrationTest {
 		}
 	}
 
-	public static class UseOldValueTestAnalyzerStub extends AbstractTestAnalyzerStub {
+	public static class UseOldValueTestStubAnalyzer extends AbstractTestStubAnalyzer {
 
-		public UseOldValueTestAnalyzerStub() {
+		public UseOldValueTestStubAnalyzer() {
 			super();
 
 			updater.registerReplacement(NEW_OPTION_NAME, OLD_OPTION_NAME, oldValue -> {
@@ -496,9 +504,9 @@ public class AnalysisOptions2Test extends AbstractGhidraHeadedIntegrationTest {
 		}
 	}
 
-	public static class ConvertValueTypeTestAnalyzerStub extends AbstractTestAnalyzerStub {
+	public static class ConvertValueTypeTestStubAnalyzer extends AbstractTestStubAnalyzer {
 
-		public ConvertValueTypeTestAnalyzerStub() {
+		public ConvertValueTypeTestStubAnalyzer() {
 			super();
 
 			updater.registerReplacement(NEW_OPTION_NAME, OLD_OPTION_NAME, oldValue -> {

Ghidra/Framework/Generic/src/main/java/ghidra/util/classfinder/ClassDir.java

@@ -33,7 +33,7 @@ class ClassDir {
 		classPackage = new ClassPackage(dir, "", monitor);
 	}
 
-	void getClasses(Set<Class<?>> set, TaskMonitor monitor) throws CancelledException {
+	void getClasses(Set<ClassFileInfo> set, TaskMonitor monitor) throws CancelledException {
 		classPackage.getClasses(set, monitor);
 	}
 

Ghidra/Framework/Generic/src/main/java/ghidra/util/classfinder/ClassFileInfo.java

@@ -0,0 +1,25 @@
+/* ###
+ * 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.util.classfinder;
+
+/**
+ * Information about a class file on disk
+ * 
+ * @param path The path to the class file (or jar containing the class)
+ * @param name The name of the class (including package)
+ * @param suffix The class suffix (i.e., extension point type name)
+ */
+public record ClassFileInfo(String path, String name, String suffix) {}

Ghidra/Framework/Generic/src/main/java/ghidra/util/classfinder/ClassFinder.java

@@ -1,253 +0,0 @@
-/* ###
- * 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.util.classfinder;
-
-import java.io.File;
-import java.lang.reflect.Modifier;
-import java.util.*;
-
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
-
-import generic.json.Json;
-import ghidra.GhidraClassLoader;
-import ghidra.util.Msg;
-import ghidra.util.SystemUtilities;
-import ghidra.util.exception.CancelledException;
-import ghidra.util.extensions.*;
-import ghidra.util.task.TaskMonitor;
-import utility.module.ModuleUtilities;
-
-/**
- * Finds extension classes in the classpath
- */
-public class ClassFinder {
-	static final Logger log = LogManager.getLogger(ClassFinder.class);
-
-	private static final boolean IS_USING_RESTRICTED_EXTENSIONS =
-		Boolean.getBoolean(GhidraClassLoader.ENABLE_RESTRICTED_EXTENSIONS_PROPERTY);
-
-	private static List<Class<?>> FILTER_CLASSES =
-		Collections.unmodifiableList(Arrays.asList(ExtensionPoint.class));
-
-	private Set<ClassDir> classDirs = new HashSet<>();
-	private Set<ClassJar> classJars = new HashSet<>();
-
-	public ClassFinder(List<String> searchPaths, TaskMonitor monitor) throws CancelledException {
-		initialize(searchPaths, monitor);
-	}
-
-	private void initialize(List<String> searchPaths, TaskMonitor monitor)
-			throws CancelledException {
-
-		Msg.trace(this,
-			"Using restricted extension class loader? " + IS_USING_RESTRICTED_EXTENSIONS);
-
-		Set<String> pathSet = new LinkedHashSet<>(searchPaths);
-		Iterator<String> pathIterator = pathSet.iterator();
-		while (pathIterator.hasNext()) {
-			monitor.checkCancelled();
-			String path = pathIterator.next();
-			String lcPath = path.toLowerCase();
-			File file = new File(path);
-			if ((lcPath.endsWith(".jar") || lcPath.endsWith(".zip")) && file.exists()) {
-
-				if (ClassJar.ignoreJar(lcPath)) {
-					log.trace("Ignoring jar file: {}", path);
-					continue;
-				}
-
-				log.trace("Searching jar file: {}", path);
-				classJars.add(new ClassJar(path, monitor));
-			}
-			else if (file.isDirectory()) {
-				log.trace("Searching classpath directory: {}", path);
-				classDirs.add(new ClassDir(path, monitor));
-			}
-		}
-	}
-
-	List<Class<?>> getClasses(TaskMonitor monitor) throws CancelledException {
-
-		Set<Class<?>> classSet = new HashSet<>();
-
-		for (ClassDir dir : classDirs) {
-			monitor.checkCancelled();
-			dir.getClasses(classSet, monitor);
-		}
-
-		for (ClassJar jar : classJars) {
-			monitor.checkCancelled();
-			jar.getClasses(classSet, monitor);
-		}
-
-		List<Class<?>> classList = new ArrayList<>(classSet);
-
-		Collections.sort(classList, (c1, c2) -> {
-			// Sort classes primarily by priority and secondarily by name
-			int p1 = ExtensionPointProperties.Util.getPriority(c1);
-			int p2 = ExtensionPointProperties.Util.getPriority(c2);
-			if (p1 > p2) {
-				return -1;
-			}
-			if (p1 < p2) {
-				return 1;
-			}
-			String n1 = c1.getName();
-			String n2 = c2.getName();
-			if (n1.equals(n2)) {
-				// Same priority and same package/class name....just arbitrarily choose one 
-				return Integer.compare(c1.hashCode(), c2.hashCode());
-			}
-			return n1.compareTo(n2);
-		});
-
-		return classList;
-	}
-
-	/**
-	 * If the given class name matches the known extension name patterns, then this method will try
-	 * to load that class using the provided path.   Extensions may be loaded using their own 
-	 * class loader, depending on the system property 
-	 * {@link GhidraClassLoader#ENABLE_RESTRICTED_EXTENSIONS_PROPERTY}.
-	 * <p>
-	 * Examples: 
-	 * <pre>
-	 * /foo/bar/baz/file.jar fully.qualified.ClassName
-	 * /foo/bar/baz/bin fully.qualified.ClassName
-	 * </pre>
-	 * 
-	 * @param path the jar or dir path
-	 * @param className the fully qualified class name
-	 * @return the class if it is an extension point
-	 */
-	/*package*/ static Class<?> loadExtensionPoint(String path, String className) {
-
-		if (!ClassSearcher.isExtensionPointName(className)) {
-			return null;
-		}
-
-		ClassLoader classLoader = getClassLoader(path);
-
-		try {
-			Class<?> c = Class.forName(className, true, classLoader);
-			if (isClassOfInterest(c)) {
-				return c;
-			}
-		}
-		catch (Throwable t) {
-			processClassLoadError(path, className, t);
-		}
-
-		return null;
-	}
-
-	private static ClassLoader getClassLoader(String path) {
-		ClassLoader classLoader = ClassSearcher.class.getClassLoader();
-		if (!IS_USING_RESTRICTED_EXTENSIONS) {
-			return classLoader; // custom extension class loader is disabled
-		}
-
-		ExtensionDetails extension = ExtensionUtils.getExtension(path);
-		if (extension != null) {
-			Msg.trace(ClassFinder.class,
-				"Installing custom extension class loader for: " + Json.toStringFlat(extension));
-			classLoader = new ExtensionModuleClassLoader(extension);
-		}
-		return classLoader;
-	}
-
-	private static void processClassLoadError(String path, String name, Throwable t) {
-
-		if (t instanceof LinkageError) {
-			// We see this sometimes when loading classes that match our naming convention for
-			// extension points, but are actually extending 3rd party libraries.  For now, do 
-			// not make noise in the log for this case.
-			Msg.trace(ClassFinder.class,
-				"LinkageError loading class " + name + "; Incompatible class version? ", t);
-			return;
-		}
-
-		if (!(t instanceof ClassNotFoundException)) {
-			Msg.error(ClassFinder.class, "Error loading class " + name + " - " + t.getMessage(), t);
-			return;
-		}
-
-		processClassNotFoundExcepetion(path, name, (ClassNotFoundException) t);
-	}
-
-	private static void processClassNotFoundExcepetion(String path, String name,
-			ClassNotFoundException t) {
-
-		if (!isModuleEntryMissingFromClasspath(path)) {
-			// not sure if this can actually happen--it implies a half-built Eclipse issue
-			Msg.error(ClassFinder.class, "Error loading class " + name + " - " + t.getMessage(), t);
-			return;
-		}
-
-		// We have a special case: we know a module class was loaded, but it is not in our
-		// classpath.  This can happen in Eclipse when we scan all modules, but the launcher does
-		// not include all modules.
-		if (SystemUtilities.isInTestingMode()) {
-			// ignore the error in testing mode, as many modules are not loaded for any given test
-			return;
-		}
-
-		Msg.error(ClassFinder.class,
-			"Module class is missing from the classpath.\n\tUpdate your launcher " +
-				"accordingly.\n\tModule: '" + path + "'\n\tClass: '" + name + "'");
-	}
-
-	private static boolean isModuleEntryMissingFromClasspath(String path) {
-
-		boolean inModule = ModuleUtilities.isInModule(path);
-		if (!inModule) {
-			return false;
-		}
-
-		String classPath = System.getProperty("java.class.path");
-		boolean inClassPath = classPath.contains(path);
-		return !inClassPath;
-	}
-
-	/**
-	 * Checks to see if the given class is an extension point of interest.
-	 * 
-	 * @param c The class to check.
-	 * @return True if the given class is an extension point of interest; otherwise, false.
-	 */
-	public static boolean isClassOfInterest(Class<?> c) {
-		if (Modifier.isAbstract(c.getModifiers())) {
-			return false;
-		}
-		if (c.getEnclosingClass() != null && !Modifier.isStatic(c.getModifiers())) {
-			return false;
-		}
-		if (!Modifier.isPublic(c.getModifiers())) {
-			return false;
-		}
-		if (ExtensionPointProperties.Util.isExcluded(c)) {
-			return false;
-		}
-
-		for (Class<?> filterClasse : FILTER_CLASSES) {
-			if (filterClasse.isAssignableFrom(c)) {
-				return true;
-			}
-		}
-		return false;
-	}
-}

Ghidra/Framework/Generic/src/main/java/ghidra/util/classfinder/ClassJar.java

@@ -36,7 +36,7 @@ import ghidra.util.exception.CancelledException;
 import ghidra.util.task.TaskMonitor;
 import utility.application.ApplicationLayout;
 
-class ClassJar extends ClassLocation {
+class ClassJar implements ClassLocation {
 
 	/** 
 	 * Pattern for matching jar files in a module lib dir
@@ -51,6 +51,7 @@ class ClassJar extends ClassLocation {
 	private static final String PATCH_DIR_PATH_FORWARD_SLASHED = getPatchDirPath();
 	private static final Set<String> USER_PLUGIN_PATHS = loadUserPluginPaths();
 
+	private Set<ClassFileInfo> classes = new HashSet<>();
 	private String path;
 
 	ClassJar(String path, TaskMonitor monitor) throws CancelledException {
@@ -61,8 +62,7 @@ class ClassJar extends ClassLocation {
 	}
 
 	@Override
-	protected void getClasses(Set<Class<?>> set, TaskMonitor monitor) {
+	public void getClasses(Set<ClassFileInfo> set, TaskMonitor monitor) {
-		checkForDuplicates(set);
 		set.addAll(classes);
 	}
 
@@ -174,9 +174,9 @@ class ClassJar extends ClassLocation {
 		name = name.substring(0, name.indexOf(CLASS_EXT));
 		name = name.replace('/', '.');
 
-		Class<?> c = ClassFinder.loadExtensionPoint(path, name);
+		String epName = ClassSearcher.getExtensionPointSuffix(name);
-		if (c != null) {
+		if (epName != null) {
-			classes.add(c);
+			classes.add(new ClassFileInfo(path, name, epName));
 		}
 	}
 

Ghidra/Framework/Generic/src/main/java/ghidra/util/classfinder/ClassLocation.java

@@ -15,52 +15,17 @@
  */
 package ghidra.util.classfinder;
 
-import java.net.URL;
-import java.util.HashSet;
 import java.util.Set;
 
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
-
 import ghidra.util.exception.CancelledException;
 import ghidra.util.task.TaskMonitor;
 
 /**
  * Represents a place from which {@link Class}s can be obtained
  */
-abstract class ClassLocation {
+interface ClassLocation {
 
-	protected static final String CLASS_EXT = ".class";
+	public static final String CLASS_EXT = ".class";
 
-	protected final Logger log = LogManager.getLogger(getClass());
+	public void getClasses(Set<ClassFileInfo> set, TaskMonitor monitor) throws CancelledException;
-
-	protected Set<Class<?>> classes = new HashSet<>();
-
-	protected abstract void getClasses(Set<Class<?>> set, TaskMonitor monitor)
-			throws CancelledException;
-
-	protected void checkForDuplicates(Set<Class<?>> existingClasses) {
-		for (Class<?> c : classes) {
-			// Note: our class and a matching class in 'existingClasses' will be '==' since the 
-			// class loader loaded the class by name--it will always find the same class, in 
-			// classpath order.
-			if (existingClasses.contains(c)) {
-				log.warn(() -> generateMessage(c));
-			}
-		}
-	}
-
-	private String generateMessage(Class<?> c) {
-		return String.format("Class defined in multiple locations: %s. Keeping class loaded " +
-			"from %s; ignoring class from %s", c, toLocation(c), this);
-	}
-
-	private String toLocation(Class<?> clazz) {
-		String name = clazz.getName();
-		String classAsPath = '/' + name.replace('.', '/') + ".class";
-		URL url = clazz.getResource(classAsPath);
-		String urlPath = url.getPath();
-		int index = urlPath.indexOf(classAsPath);
-		return urlPath.substring(0, index);
-	}
 }

Ghidra/Framework/Generic/src/main/java/ghidra/util/classfinder/ClassPackage.java

@@ -23,7 +23,7 @@ import ghidra.util.Msg;
 import ghidra.util.exception.CancelledException;
 import ghidra.util.task.TaskMonitor;
 
-class ClassPackage extends ClassLocation {
+class ClassPackage implements ClassLocation {
 
 	private static final FileFilter CLASS_FILTER =
 		pathname -> pathname.getName().endsWith(CLASS_EXT);
@@ -32,6 +32,7 @@ class ClassPackage extends ClassLocation {
 	private File rootDir;
 	private File packageDir;
 	private String packageName;
+	private Set<ClassFileInfo> classes = new HashSet<>();
 
 	ClassPackage(File rootDir, String packageName, TaskMonitor monitor) throws CancelledException {
 		monitor.checkCancelled();
@@ -47,9 +48,9 @@ class ClassPackage extends ClassLocation {
 		String path = rootDir.getAbsolutePath();
 		Set<String> allClassNames = getAllClassNames();
 		for (String className : allClassNames) {
-			Class<?> c = ClassFinder.loadExtensionPoint(path, className);
+			String epName = ClassSearcher.getExtensionPointSuffix(className);
-			if (c != null) {
+			if (epName != null) {
-				classes.add(c);
+				classes.add(new ClassFileInfo(path, className, epName));
 			}
 		}
 	}
@@ -88,9 +89,7 @@ class ClassPackage extends ClassLocation {
 	}
 
 	@Override
-	protected void getClasses(Set<Class<?>> set, TaskMonitor monitor) throws CancelledException {
+	public void getClasses(Set<ClassFileInfo> set, TaskMonitor monitor) throws CancelledException {
-
-		checkForDuplicates(set);
 
 		set.addAll(classes);
 

Ghidra/Framework/Generic/src/main/java/ghidra/util/classfinder/ClassSearcher.java

@@ -18,7 +18,10 @@ package ghidra.util.classfinder;
 import java.io.File;
 import java.io.IOException;
 import java.lang.reflect.Constructor;
+import java.lang.reflect.Modifier;
 import java.nio.file.*;
+import java.time.Instant;
+import java.time.temporal.ChronoUnit;
 import java.util.*;
 import java.util.function.Predicate;
 import java.util.regex.Matcher;
@@ -27,21 +30,25 @@ import java.util.stream.Collectors;
 
 import javax.swing.event.ChangeListener;
 
+import org.apache.commons.collections4.BidiMap;
+import org.apache.commons.collections4.bidimap.DualHashBidiMap;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 import generic.jar.ResourceFile;
+import generic.json.Json;
 import ghidra.GhidraClassLoader;
 import ghidra.framework.Application;
-import ghidra.util.Msg;
+import ghidra.util.*;
-import ghidra.util.SystemUtilities;
 import ghidra.util.datastruct.WeakDataStructureFactory;
 import ghidra.util.datastruct.WeakSet;
 import ghidra.util.exception.AssertException;
 import ghidra.util.exception.CancelledException;
+import ghidra.util.extensions.*;
 import ghidra.util.task.TaskMonitor;
 import utilities.util.FileUtilities;
+import utility.module.ModuleUtilities;
 
 /**
  * This class is a collection of static methods used to discover classes that implement a
@@ -60,88 +67,171 @@ import utilities.util.FileUtilities;
  */
 public class ClassSearcher {
 
-	// This provides a means for custom apps that do not use a module structure to search all jars
+	private static final Logger log = LogManager.getLogger(ClassSearcher.class);
+
+	/** 
+	 * This provides a means for custom apps that do not use a module structure to search all jars
+	 */
 	public static final String SEARCH_ALL_JARS_PROPERTY = "class.searcher.search.all.jars";
-	private static final String SEARCH_ALL_JARS_PROPERTY_VALUE =
+	static final boolean SEARCH_ALL_JARS = Boolean.getBoolean(SEARCH_ALL_JARS_PROPERTY);
-		System.getProperty(SEARCH_ALL_JARS_PROPERTY, Boolean.FALSE.toString());
-	static final boolean SEARCH_ALL_JARS = Boolean.parseBoolean(SEARCH_ALL_JARS_PROPERTY_VALUE);
 
-	static final Logger log = LogManager.getLogger(ClassSearcher.class);
+	private static final boolean IS_USING_RESTRICTED_EXTENSIONS =
-
+		Boolean.getBoolean(GhidraClassLoader.ENABLE_RESTRICTED_EXTENSIONS_PROPERTY);
-	private static ClassFinder searcher;
-	private static List<Class<?>> extensionPoints;
 
+	private static List<Class<?>> FILTER_CLASSES = Arrays.asList(ExtensionPoint.class);
+	private static Pattern extensionPointSuffixPattern;
+	private static Map<String, Set<ClassFileInfo>> extensionPointSuffixToInfoMap;
+	private static BidiMap<ClassFileInfo, Class<?>> loadedCache = new DualHashBidiMap<>();
+	private static Set<ClassFileInfo> falsePositiveCache = new HashSet<>();
+	private static volatile boolean hasSearched;
+	private static volatile boolean isSearching;
 	private static WeakSet<ChangeListener> listenerList =
 		WeakDataStructureFactory.createCopyOnReadWeakSet();
 
-	private static Pattern extensionPointSuffixPattern;
+	/**
-
+	 * Prevent class instantiation
-	private static volatile boolean hasSearched;
+	 */
-	private static volatile boolean isSearching;
-	private static final ClassFilter DO_NOTHING_FILTER = c -> true;
-
 	private ClassSearcher() {
-		// you cannot create one of these
+		// do nothing
+	}
+
+	/**
+	 * Searches the classpath and updates the list of available classes which satisfies the 
+	 * internal class filter. When the search completes (and was not cancelled), any registered 
+	 * change listeners are notified.
+	 *
+	 * @param monitor the progress monitor for the search
+	 * @throws CancelledException if the operation was cancelled
+	 */
+	public static void search(TaskMonitor monitor) throws CancelledException {
+
+		if (hasSearched) {
+			log.trace("Already searched for classes: using cached results");
+			return;
+		}
+
+		log.trace("Using restricted extension class loader? " + IS_USING_RESTRICTED_EXTENSIONS);
+
+		Instant start = Instant.now();
+		isSearching = true;
+
+		if (Application.inSingleJarMode()) {
+			log.trace("Single Jar Mode: using extensions from the jar file");
+			extensionPointSuffixToInfoMap = loadExtensionClassesFromJar();
+		}
+		else {
+			extensionPointSuffixToInfoMap = findClasses(monitor);
+		}
+
+		log.trace("Found extension classes {}", extensionPointSuffixToInfoMap);
+		if (extensionPointSuffixToInfoMap.isEmpty()) {
+			throw new AssertException("Unable to locate extension points!");
+		}
+
+		hasSearched = true;
+		isSearching = false;
+
+		Swing.runNow(() -> fireClassListChanged());
+
+		String finishedMessage =
+			"Class search complete (" + ChronoUnit.MILLIS.between(start, Instant.now()) + " ms)";
+		monitor.setMessage(finishedMessage);
+		log.info(finishedMessage);
 	}
 
 	/**
 	 * Get {@link ExtensionPointProperties#priority() priority-sorted} classes that implement or
-	 * derive from the given class
+	 * derive from the given ancestor class
 	 * 
-	 * @param c the filter class
+	 * @param ancestorClass the ancestor class
 	 * @return set of classes that implement or extend T
 	 */
-	public static <T> List<Class<? extends T>> getClasses(Class<T> c) {
+	public static <T> List<Class<? extends T>> getClasses(Class<T> ancestorClass) {
-		return getClasses(c, null);
+		return getClasses(ancestorClass, null);
 	}
 
 	/**
 	 * Get {@link ExtensionPointProperties#priority() priority-sorted} classes that
-	 * implement or derive from the given class
+	 * implement or derive from the given ancestor class
 	 * 
-	 * @param c the filter class
+	 * @param ancestorClass the ancestor class
 	 * @param classFilter A Predicate that tests class objects (that are already of type T)
-	 * 			for further filtering, <code>null</code> is equivalent to "return true"
+	 * 			for further filtering, {@code null} is equivalent to "return true"
 	 * @return {@link ExtensionPointProperties#priority() priority-sorted} list of
 	 * 			classes that implement or extend T and pass the filtering test performed by the
 	 * 			predicate
 	 */
 	@SuppressWarnings("unchecked") // we checked the type of each use so we know the casts are safe
-	public static <T> List<Class<? extends T>> getClasses(Class<T> c,
+	public static <T> List<Class<? extends T>> getClasses(Class<T> ancestorClass,
 			Predicate<Class<? extends T>> classFilter) {
+		if (!hasSearched) {
+			return List.of();
+		}
 		if (isSearching) {
 			throw new IllegalStateException(
 				"Cannot call the getClasses() while the ClassSearcher is searching!");
 		}
 
-		List<Class<? extends T>> list = new ArrayList<>();
+		String suffix = getExtensionPointSuffix(ancestorClass.getName());
-		if (extensionPoints == null) {
+		if (suffix == null) {
-			return list;
+			return List.of();
 		}
 
-		for (Class<?> extensionPoint : extensionPoints) {
+		List<Class<? extends T>> list = new ArrayList<>();
-			if (c.isAssignableFrom(extensionPoint) &&
+		for (ClassFileInfo info : extensionPointSuffixToInfoMap.get(suffix)) {
-				(classFilter == null || classFilter.test((Class<T>) extensionPoint))) {
+
-				list.add((Class<? extends T>) extensionPoint);
+			if (falsePositiveCache.contains(info)) {
+				continue;
+			}
+
+			Class<?> c = loadedCache.get(info);
+			if (c == null) {
+				c = loadExtensionPoint(info.path(), info.name());
+				ClassFileInfo existing = loadedCache.getKey(c);
+				if (existing != null) {
+					log.info(
+						"Skipping load of class '%s' from '%s'. Already loaded from '%s'."
+								.formatted(info.name(), info.path(), existing.path()));
+				}
+				if (c == null) {
+					falsePositiveCache.add(info);
+					continue;
+				}
+			}
+
+			loadedCache.put(info, c);
+
+			if (ancestorClass.isAssignableFrom(c) &&
+				(classFilter == null || classFilter.test((Class<T>) c))) {
+				list.add((Class<? extends T>) c);
 			}
 		}
+
+		prioritizeClasses(list);
 		return list;
 	}
 
+	/**
+	 * Gets all {@link ExtensionPointProperties#priority() priority-sorted} class instances that 
+	 * implement or derive from the given filter class
+	 * 
+	 * @param c the filter class
+	 * @return {@link ExtensionPointProperties#priority() priority-sorted} {@link List} of 
+	 *   class instances that implement or extend T
+	 */
 	public static <T> List<T> getInstances(Class<T> c) {
-		return getInstances(c, DO_NOTHING_FILTER);
+		return getInstances(c, filter -> true);
 	}
 
 	/**
-	 * Get {@link ExtensionPointProperties#priority() priority-sorted} classes
+	 * Get {@link ExtensionPointProperties#priority() priority-sorted} classes instances that 
-	 * instances that implement or derive from the given class
+	 * implement or derive from the given filter class and pass the given filter predicate
 	 * 
 	 * @param c the filter class
-	 * @param filter A Predicate that tests class objects (that are already of type T)
+	 * @param filter A filter predicate that tests class objects (that are already of type T).
-	 * 			for further filtering, <code>null</code> is equivalent to "return true"
+	 *   {@code null} is equivalent to "return true".
-	 * @return {@link ExtensionPointProperties#priority() priority-sorted} list of
+	 * @return {@link ExtensionPointProperties#priority() priority-sorted} {@link List} of class 
-	 * 			classes instances that implement or extend T and pass the filtering test performed by
+	 *   instances that implement or extend T and pass the filtering test performed by the predicate
-	 *          the predicate
 	 */
 	public static <T> List<T> getInstances(Class<T> c, ClassFilter filter) {
 		List<Class<? extends T>> classes = getClasses(c);
@@ -214,91 +304,178 @@ public class ClassSearcher {
 	}
 
 	/**
-	 * This deprecated method is now simply a pass-through for {@link #search(TaskMonitor)}.
+	 * Gets class information about each discovered potential extension point.
+	 * <p>
+	 * NOTE: A discovered potential extension point may end up not getting loaded if it is not
+	 * "of interest" (see {@link #isClassOfInterest(Class)}. These are referred to as false
+	 * positives.
 	 * 
-	 * @param forceRefresh ignored
+	 * @return A {@link Set} of class information about each discovered potential extension point
-	 * @param monitor the task monitor
-	 * @throws CancelledException if cancelled
-	 * @deprecated use {@link #search(TaskMonitor)} instead
 	 */
-	@Deprecated(forRemoval = true, since = "10.1") // remove 2 releases after 10.1
+	public static Set<ClassFileInfo> getExtensionPointInfo() {
-	public static void search(boolean forceRefresh, TaskMonitor monitor)
+		return extensionPointSuffixToInfoMap.values()
-			throws CancelledException {
+				.stream()
-		search(monitor);
+				.flatMap(e -> e.stream())
+				.collect(Collectors.toSet());
 	}
 
 	/**
-	 * Searches the classpath and updates the list of available classes which
+	 * Gets class information about each loaded extension point.
-	 * satisfy the class filter.  Classes which
+	 * <p>
-	 * data types, and language providers. When the search completes and was
+	 * NOTE: Ghidra may load more classes as it runs. Therefore, repeated calls to this method may
-	 * not cancelled, the change listeners are notified.
+	 * return more results, as more extension points are loaded.
-	 *
+	 * 
-	 * @param monitor the progress monitor for the search.
+	 * @return A {@link Set} of class information about each loaded extension point
-	 * @throws CancelledException if the operation is cancelled
 	 */
-	public static void search(TaskMonitor monitor) throws CancelledException {
+	public static Set<ClassFileInfo> getLoaded() {
-
+		return loadedCache.keySet();
-		if (hasSearched) {
-			log.trace("Already searched for classes: using cached results");
-			return;
-		}
-
-		if (Application.inSingleJarMode()) {
-			log.trace("Single Jar Mode: using extensions from the jar file");
-			loadExtensionClassesFromJar();
-			return;
-		}
-
-		isSearching = true;
-
-		loadExtensionPointSuffixes();
-
-		extensionPoints = null;
-
-		long t = (new Date()).getTime();
-
-		log.info("Searching for classes...");
-		List<String> searchPaths = gatherSearchPaths();
-		searcher = new ClassFinder(searchPaths, monitor);
-
-		monitor.setMessage("Loading classes...");
-		extensionPoints = searcher.getClasses(monitor);
-		log.trace("Found extension classes {}", extensionPoints);
-		if (extensionPoints.isEmpty()) {
-			throw new AssertException("Unable to location extension points!");
-		}
-
-		hasSearched = true;
-		isSearching = false;
-
-		SystemUtilities.runSwingNow(() -> fireClassListChanged());
-
-		String finishedMessage = "Class search complete (%d ms, %d classes loaded)"
-				.formatted((new Date()).getTime() - t, extensionPoints.size());
-		monitor.setMessage(finishedMessage);
-		log.info(finishedMessage);
 	}
 
 	/**
-	 * Gets the given class's extension point name
+	 * Gets class information about discovered potential extension points that end up not getting
+	 * loaded.
+	 * <p>
+	 * NOTE: Ghidra may load more classes as it runs. Therefore, repeated calls to this method may
+	 * return more results, as more potential extension points are identified as false positives.
+	 * 
+	 * @return A {@link Set} of class information about each loaded extension point
+	 */
+	public static Set<ClassFileInfo> getFalsePositives() {
+		return falsePositiveCache;
+	}
+
+	/**
+	 * Gets the given class's extension point suffix.
+	 * <p>
+	 * Note that if multiple suffixes match, the smallest will be chosen. For a detailed
+	 * explanation, see the comment inside {@link #loadExtensionPointSuffixes()}.
 	 * 
 	 * @param className The name of the potential extension point class
-	 * @return The given class's extension point name, or null if it is not an extension point
+	 * @return The given class's extension point suffix, or null if it is not an extension point or
+	 *   {@link #search(TaskMonitor)} has not been called yet
 	 */
-	public static String getExtensionPointName(String className) {
+	public static String getExtensionPointSuffix(String className) {
-		if (className.indexOf("Test$") > 0 || className.endsWith("Test")) {
+		if (extensionPointSuffixPattern == null) {
+			extensionPointSuffixPattern = loadExtensionPointSuffixes();
+		}
+		if (className.contains("$") || className.endsWith("Test")) {
 			return null;
 		}
 		int packageIndex = className.lastIndexOf('.');
-		int innerClassIndex = className.lastIndexOf('$');
+		if (packageIndex > 0) {
-		int maximumIndex = StrictMath.max(packageIndex, innerClassIndex);
+			className = className.substring(packageIndex + 1);
-		if (maximumIndex > 0) {
-			className = className.substring(maximumIndex + 1);
 		}
 		Matcher m = extensionPointSuffixPattern.matcher(className);
 		return m.find() && m.groupCount() == 1 ? m.group(1) : null;
 	}
 
+	/**
+	 * Checks to see if the given class is an extension point of interest.
+	 * 
+	 * @param c The class to check.
+	 * @return True if the given class is an extension point of interest; otherwise, false.
+	 */
+	public static boolean isClassOfInterest(Class<?> c) {
+		if (Modifier.isAbstract(c.getModifiers())) { // we don't support abstract (includes interfaces)
+			return false;
+		}
+		if (c.getEnclosingClass() != null) { // we don't support inner classes
+			return false;
+		}
+		if (!Modifier.isPublic(c.getModifiers())) { // we don't support non-public
+			return false;
+		}
+		if (ExtensionPointProperties.Util.isExcluded(c)) {
+			return false;
+		}
+
+		for (Class<?> filterClass : FILTER_CLASSES) {
+			if (filterClass.isAssignableFrom(c)) {
+				return true;
+			}
+		}
+		return false;
+	}
+
+	/**
+	 * Writes the current class searcher statistics to the info log
+	 */
+	public static void logStatistics() {
+		log.info("Class searcher loaded %d extension points (%d false positives)"
+				.formatted(loadedCache.size(), falsePositiveCache.size()));
+	}
+
+	/**
+	 * Scans the disk to find potential extension point class files. Matching is performed by file
+	 * name only. The class files are not opened or loaded by this method.
+	 * 
+	 * @param monitor the progress monitor for the disk scan
+	 * @return A {@link Map} of discovered {@link ClassFileInfo class information}, keyed by their
+	 *   extension point suffix
+	 * @throws CancelledException if the user cancelled the operation
+	 */
+	private static Map<String, Set<ClassFileInfo>> findClasses(TaskMonitor monitor)
+			throws CancelledException {
+		log.info("Searching for classes...");
+
+		Set<ClassDir> classDirs = new HashSet<>();
+		Set<ClassJar> classJars = new HashSet<>();
+
+		for (String searchPath : gatherSearchPaths()) {
+			String lcSearchPath = searchPath.toLowerCase();
+			File searchFile = new File(searchPath);
+			if ((lcSearchPath.endsWith(".jar") || lcSearchPath.endsWith(".zip")) &&
+				searchFile.exists()) {
+
+				if (ClassJar.ignoreJar(searchPath)) {
+					log.trace("Ignoring jar file: {}", searchPath);
+					continue;
+				}
+
+				log.trace("Searching jar file: {}", searchPath);
+				classJars.add(new ClassJar(searchPath, monitor));
+			}
+			else if (searchFile.isDirectory()) {
+				log.trace("Searching classpath directory: {}", searchPath);
+				classDirs.add(new ClassDir(searchPath, monitor));
+			}
+		}
+
+		Set<ClassFileInfo> classSet = new HashSet<>();
+		for (ClassDir dir : classDirs) {
+			monitor.checkCancelled();
+			dir.getClasses(classSet, monitor);
+		}
+		for (ClassJar jar : classJars) {
+			monitor.checkCancelled();
+			jar.getClasses(classSet, monitor);
+		}
+
+		return classSet.stream()
+				.collect(Collectors.groupingBy(ClassFileInfo::suffix, Collectors.toSet()));
+	}
+
+	/**
+	 * Sorts the given {@link List} of {@link Class}es first by their defined priority, then by
+	 * their name.
+	 * 
+	 * @param list The {@link List} of {@link Class}es to sort. This {@link List} will be modified.
+	 */
+	private static <T> void prioritizeClasses(List<Class<? extends T>> list) {
+		Collections.sort(list, (c1, c2) -> {
+			// Sort classes primarily by priority and secondarily by name
+			int p1 = ExtensionPointProperties.Util.getPriority(c1);
+			int p2 = ExtensionPointProperties.Util.getPriority(c2);
+			if (p1 > p2) {
+				return -1;
+			}
+			if (p1 < p2) {
+				return 1;
+			}
+			return c1.getName().compareTo(c2.getName());
+		});
+	}
+
 	private static List<String> gatherSearchPaths() {
 
 		//
@@ -315,7 +492,7 @@ public class ClassSearcher {
 
 	private static void getPropertyPaths(String property, List<String> results) {
 		String paths = System.getProperty(property);
-		Msg.trace(ClassSearcher.class, "Paths in " + property + ": " + paths);
+		log.trace("Paths in {}: {}", property, paths);
 		if (StringUtils.isBlank(paths)) {
 			return;
 		}
@@ -351,36 +528,35 @@ public class ClassSearcher {
 		catch (InvalidPathException e) {
 			// we have seen odd strings being placed into the classpath--ignore them, as we
 			// don't know how to use them
-			Msg.trace(ClassSearcher.class, "Invalid path '" + path + "'", e);
+			log.trace("Invalid path '{}'", path);
 			return path;
 		}
 	}
 
-	private static void loadExtensionClassesFromJar() {
+	private static Map<String, Set<ClassFileInfo>> loadExtensionClassesFromJar() {
 		ResourceFile appRoot = Application.getApplicationRootDirectory();
 		ResourceFile extensionClassesFile = new ResourceFile(appRoot, "EXTENSION_POINT_CLASSES");
 		try {
 			List<String> classNames = FileUtilities.getLines(extensionClassesFile);
-			List<Class<?>> extensionClasses = new ArrayList<>();
+			Set<ClassFileInfo> extensionClasses = new HashSet<>();
 			for (String className : classNames) {
-				try {
+				String epName = getExtensionPointSuffix(className);
-					Class<?> clazz = Class.forName(className);
+				if (epName != null) {
-					extensionClasses.add(clazz);
+					extensionClasses
-				}
+							.add(new ClassFileInfo(appRoot.getAbsolutePath(), className, epName));
-				catch (ClassNotFoundException e) {
-					Msg.warn(ClassSearcher.class, "Can't load extension point: " + className);
 				}
 			}
-			extensionPoints = Collections.unmodifiableList(extensionClasses);
+			return extensionClasses.stream()
+					.collect(Collectors.groupingBy(ClassFileInfo::suffix, Collectors.toSet()));
 
 		}
 		catch (IOException e) {
-			throw new AssertException("Unexpected IOException reading extension class file " +
+			throw new AssertException(
-				extensionClassesFile, e);
+				"Unexpected IOException reading extension class file " + extensionClassesFile, e);
 		}
 	}
 
-	private static void loadExtensionPointSuffixes() {
+	private static Pattern loadExtensionPointSuffixes() {
 		Set<String> extensionPointSuffixes = new HashSet<>();
 
 		Collection<ResourceFile> moduleRootDirectories = Application.getModuleRootDirectories();
@@ -397,6 +573,26 @@ public class ClassSearcher {
 			}
 		}
 
+		// Build regex of the form .*(suffix1|suffix2|suffix3|...)$
+		// If one suffix ends with another suffix, precedence should be given to the shorter one.
+		// This will result in some false positives, but will prevent some corner error cases as
+		// described in this example:
+		// There are 2 valid suffixes, Plugin and BobPlugin. Someone makes a new class:
+		//
+		//     class BillBobPlugin extends Plugin
+		//
+		// The person who made this class was unaware that BobPlugin was also a valid suffix. If
+		// we were to match on the longest suffix, BillBobPlugin would erroneously be associated
+		// with BobPlugin, and getClasses() would fail. Now consider this example:
+		//
+		//     class BillBobPlugin extends BobPlugin
+		//
+		// Since BillBobPlugin will be associated with the shorter "Plugin" suffix, it will be
+		// grouped with the other Plugin extension points.  However, when getClasses(BobPlugin.class)
+		// is called, we retrieve the same shortest suffix from the given "BobPlugin" class name, 
+		// which is Plugin. This will result in BillBobPlugin getting properly discovered from the
+		// Plugin group. Final checks are performed to make sure the provided class is assignable
+		// from any class in the group, which filters out the bad associations.
 		StringBuilder buffy = new StringBuilder(".*(");
 		String between = "";
 		for (String suffix : extensionPointSuffixes) {
@@ -410,12 +606,8 @@ public class ClassSearcher {
 			between = "|";
 		}
 		buffy.append(")$");
-		extensionPointSuffixPattern = Pattern.compile(buffy.toString());
+		log.trace("Using extension point pattern: {}", buffy);
-		log.trace("Using extension point pattern: {}", extensionPointSuffixPattern);
+		return Pattern.compile(buffy.toString());
-	}
-
-	static boolean isExtensionPointName(String name) {
-		return getExtensionPointName(name) != null;
 	}
 
 	private static void fireClassListChanged() {
@@ -429,4 +621,107 @@ public class ClassSearcher {
 			}
 		}
 	}
+
+	/**
+	 * If the given class name matches the known extension name patterns, then this method will try
+	 * to load that class using the provided path.   Extensions may be loaded using their own 
+	 * class loader, depending on the system property 
+	 * {@link GhidraClassLoader#ENABLE_RESTRICTED_EXTENSIONS_PROPERTY}.
+	 * <p>
+	 * Examples: 
+	 * <pre>
+	 * /foo/bar/baz/file.jar fully.qualified.ClassName
+	 * /foo/bar/baz/bin fully.qualified.ClassName
+	 * </pre>
+	 * 
+	 * @param path the jar or dir path
+	 * @param className the fully qualified class name
+	 * @return the class if it is an extension point
+	 */
+	private static Class<?> loadExtensionPoint(String path, String className) {
+
+		if (getExtensionPointSuffix(className) == null) {
+			return null;
+		}
+
+		ClassLoader classLoader = getClassLoader(path);
+
+		try {
+			Class<?> c = Class.forName(className, true, classLoader);
+			if (isClassOfInterest(c)) {
+				return c;
+			}
+		}
+		catch (Throwable t) {
+			processClassLoadError(path, className, t);
+		}
+
+		return null;
+	}
+
+	private static ClassLoader getClassLoader(String path) {
+		ClassLoader classLoader = ClassSearcher.class.getClassLoader();
+		if (!IS_USING_RESTRICTED_EXTENSIONS) {
+			return classLoader; // custom extension class loader is disabled
+		}
+
+		ExtensionDetails extension = ExtensionUtils.getExtension(path);
+		if (extension != null) {
+			log.trace(() -> "Installing custom extension class loader for: " +
+				Json.toStringFlat(extension));
+			classLoader = new ExtensionModuleClassLoader(extension);
+		}
+		return classLoader;
+	}
+
+	private static void processClassLoadError(String path, String name, Throwable t) {
+
+		if (t instanceof LinkageError) {
+			// We see this sometimes when loading classes that match our naming convention for
+			// extension points, but are actually extending 3rd party libraries.  For now, do 
+			// not make noise in the log for this case.
+			log.trace("LinkageError loading class {}; Incompatible class version? ", name, t);
+			return;
+		}
+
+		if (!(t instanceof ClassNotFoundException)) {
+			log.error("Error loading class {} - {}", name, t.getMessage(), t);
+			return;
+		}
+
+		processClassNotFoundExcepetion(path, name, (ClassNotFoundException) t);
+	}
+
+	private static void processClassNotFoundExcepetion(String path, String name,
+			ClassNotFoundException t) {
+
+		if (!isModuleEntryMissingFromClasspath(path)) {
+			// not sure if this can actually happen--it implies a half-built Eclipse issue
+			log.error("Error loading class {} - {}", name, t.getMessage(), t);
+			return;
+		}
+
+		// We have a special case: we know a module class was loaded, but it is not in our
+		// classpath.  This can happen in Eclipse when we scan all modules, but the launcher does
+		// not include all modules.
+		if (SystemUtilities.isInTestingMode()) {
+			// ignore the error in testing mode, as many modules are not loaded for any given test
+			return;
+		}
+
+		log.error("Module class is missing from the classpath.\n\tUpdate your launcher " +
+			"accordingly.\n\tModule: '" + path + "'\n\tClass: '" + name + "'");
+	}
+
+	private static boolean isModuleEntryMissingFromClasspath(String path) {
+
+		boolean inModule = ModuleUtilities.isInModule(path);
+		if (!inModule) {
+			return false;
+		}
+
+		String classPath = System.getProperty("java.class.path");
+		boolean inClassPath = classPath.contains(path);
+		return !inClassPath;
+	}
 }