Fix bug for args in methods with generics

src/main/java/jadx/codegen/MethodGen.java

@@ -263,7 +263,7 @@ public class MethodGen {
 	}
 
 	private void makeFallbackMethod(CodeWriter code, MethodNode mth) {
-		if (!mth.getAccessFlags().isStatic()) {
+		if (mth.getThisArg() != null) {
 			code.startLine(getFallbackMethodGen(mth).makeArgName(mth.getThisArg())).add(" = this;");
 		}
 		makeFallbackInsns(code, mth, mth.getInstructions(), true);

src/main/java/jadx/dex/instructions/args/ArgType.java

@@ -5,6 +5,7 @@ import jadx.utils.Utils;
 
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
@@ -421,6 +422,9 @@ public abstract class ArgType {
 	}
 
 	private static List<ArgType> parseSignatureListInner(String str, boolean parsePrimitives) {
+		if (str.isEmpty()) {
+			return Collections.emptyList();
+		}
 		if (str.equals("*")) {
 			return Arrays.asList(UNKNOWN);
 		}

src/main/java/jadx/dex/nodes/MethodNode.java

@@ -154,29 +154,32 @@ public class MethodNode extends AttrNode implements ILoadable {
 			LOG.warn("Signature parse error: {}", returnType);
 			return false;
 		}
-		if (mthInfo.getArgumentsTypes().isEmpty()) {
-			argsList = Collections.emptyList();
-			return true;
-		}
 
 		List<ArgType> argsTypes = ArgType.parseSignatureList(argsTypesStr);
 		if (argsTypes == null)
 			return false;
 
 		if (argsTypes.size() != mthInfo.getArgumentsTypes().size()) {
+			if (argsTypes.isEmpty()) {
+				return false;
+			}
 			if (!mthInfo.isConstructor()) {
 				LOG.warn("Wrong signature parse result: " + sign + " -> " + argsTypes
 						+ ", not generic version: " + mthInfo.getArgumentsTypes());
 				return false;
 			} else if (getParentClass().getAccessFlags().isEnum()) {
 				// TODO:
-				argsTypes.add(0, mthInfo.getArgumentsTypes().get(1));
+				argsTypes.add(0, mthInfo.getArgumentsTypes().get(0));
 				argsTypes.add(1, mthInfo.getArgumentsTypes().get(1));
 			} else {
 				// add synthetic arg for outer class
 				argsTypes.add(0, mthInfo.getArgumentsTypes().get(0));
 			}
+			if (argsTypes.size() != mthInfo.getArgumentsTypes().size()) {
+				return false;
+			}
 		}
+
 		initArguments(argsTypes);
 		return true;
 	}

src/main/java/jadx/utils/Utils.java

@@ -49,6 +49,8 @@ public class Utils {
 				case '>':
 				case ',':
 				case ' ':
+				case '?':
+				case '*':
 					break;
 
 				default:

src/samples/java/jadx/samples/TestGenerics.java

@@ -1,6 +1,7 @@
 package jadx.samples;
 
 import java.util.ArrayList;
+import java.util.Enumeration;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -141,6 +142,28 @@ public class TestGenerics extends AbstractTest {
 		}
 	}
 
+	private class TestConstructor implements Enumeration<String> {
+		private final TestGenerics a;
+
+		TestConstructor(TestGenerics a) {
+			this.a = a;
+		}
+
+		@Override
+		public boolean hasMoreElements() {
+			return false;
+		}
+
+		@Override
+		public String nextElement() {
+			return null;
+		}
+	}
+
+	public Enumeration<String> testThis() {
+		return new TestConstructor(this);
+	}
+
 	private List<String> test1(Map<String, String> map) {
 		List<String> list = new ArrayList<String>();
 		String str = map.get("key");