core: fix signature processing for local variables

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

@@ -374,7 +374,7 @@ public abstract class ArgType {
 	}
 
 	public String getObject() {
-		throw new UnsupportedOperationException("ArgType.getObject()");
+		throw new UnsupportedOperationException("ArgType.getObject(), call class: " + this.getClass());
 	}
 
 	public boolean isObject() {

jadx-core/src/main/java/jadx/core/dex/nodes/parser/LocalVar.java

@@ -34,9 +34,13 @@ final class LocalVar extends RegisterArg {
 
 	private void init(String name, ArgType type, String sign) {
 		if (sign != null) {
-			ArgType gType = ArgType.generic(sign);
-			if (checkSignature(type, sign, gType)) {
-				type = gType;
+			try {
+				ArgType gType = ArgType.generic(sign);
+				if (checkSignature(type, sign, gType)) {
+					type = gType;
+				}
+			} catch (Exception e) {
+				LOG.error("Can't parse signature for local variable: " + sign, e);
 			}
 		}
 		TypedVar tv = new TypedVar(type);
@@ -45,10 +49,10 @@ final class LocalVar extends RegisterArg {
 	}
 
 	private boolean checkSignature(ArgType type, String sign, ArgType gType) {
-		boolean apply = false;
+		boolean apply;
 		ArgType el = gType.getArrayRootElement();
 		if (el.isGeneric()) {
-			if (!type.getObject().equals(el.getObject())) {
+			if (!type.getArrayRootElement().getObject().equals(el.getObject())) {
 				LOG.warn("Generic type in debug info not equals: {} != {}", type, gType);
 			}
 			apply = true;
@@ -56,6 +60,7 @@ final class LocalVar extends RegisterArg {
 			apply = true;
 		} else {
 			LOG.debug("Local var signature from debug info not generic: {}, parsed: {}", sign, gType);
+			apply = false;
 		}
 		return apply;
 	}

jadx-core/src/test/java/jadx/tests/internal/generics/TestGenerics4.java

+package jadx.tests.internal.generics;
+
+import jadx.api.InternalJadxTest;
+import jadx.core.dex.nodes.ClassNode;
+
+import org.junit.Test;
+
+import static org.hamcrest.CoreMatchers.containsString;
+import static org.hamcrest.CoreMatchers.not;
+import static org.junit.Assert.assertThat;
+
+public class TestGenerics4 extends InternalJadxTest {
+
+	public static class TestCls {
+
+		public static Class<?> method(int i) {
+			Class<?>[] a = new Class<?>[0];
+			return a[a.length - i];
+		}
+	}
+
+	@Test
+	public void test() {
+		ClassNode cls = getClassNode(TestCls.class);
+		String code = cls.getCode().toString();
+		System.out.println(code);
+
+		assertThat(code, containsString("Class<?>[] a ="));
+		assertThat(code, not(containsString("Class[] a =")));
+	}
+}