Add generic types to methods declarations

src/main/java/jadx/codegen/AnnotationGen.java

@@ -62,11 +62,15 @@ public class AnnotationGen {
 			String aCls = a.getAnnotationClass();
 			if (aCls.startsWith("dalvik.annotation.")) {
 				// skip
-				if (aCls.equals("dalvik.annotation.Signature"))
-					code.startLine("// signature: "
-							+ Utils.mergeSignature((List<String>) a.getValues().get("value")));
-				else if (Consts.DEBUG)
+				if (aCls.equals("dalvik.annotation.Signature")) {
+					if (!(node instanceof MethodNode)) {
+						String sign = Utils.mergeSignature((List<String>) a.getValues().get("value"));
+						List<ArgType> types = ArgType.parseSignatureList(sign);
+						code.startLine("// signature: " + Utils.listToString(types));
+					}
+				} else if (Consts.DEBUG) {
 					code.startLine("// " + a);
+				}
 			} else {
 				code.startLine();
 				code.add(formatAnnotation(a));

src/main/java/jadx/codegen/ClassGen.java

@@ -248,7 +248,29 @@ public class ClassGen {
 	}
 
 	public String useClass(ArgType clsType) {
-		return useClass(ClassInfo.fromType(cls.dex(), clsType));
+		String baseClass = useClass(ClassInfo.fromType(cls.dex(), clsType));
+
+		ArgType[] generics = clsType.getGenericTypes();
+		if (generics != null) {
+			StringBuilder sb = new StringBuilder();
+			sb.append(baseClass);
+			sb.append("<");
+			int len = generics.length;
+			for (int i = 0; i < len; i++) {
+				if (i != 0) {
+					sb.append(", ");
+				}
+				ArgType gt = generics[i];
+				if (gt.isTypeKnown())
+					sb.append(useClass(gt));
+				else
+					sb.append('?');
+			}
+			sb.append(">");
+			return sb.toString();
+		} else {
+			return baseClass;
+		}
 	}
 
 	public String useClass(ClassInfo classInfo) {

src/main/java/jadx/codegen/InsnGen.java

@@ -94,19 +94,7 @@ public class InsnGen {
 	}
 
 	public String declareVar(RegisterArg arg) throws CodegenException {
-		String type = useType(arg.getType());
-		ArgType[] generics = arg.getType().getGenericTypes();
-		if (generics != null) {
-			StringBuilder sb = new StringBuilder();
-			sb.append(type);
-			sb.append("/*<");
-			for (ArgType gt : generics) {
-				sb.append(useType(gt));
-			}
-			sb.append(">*/");
-			type = sb.toString();
-		}
-		return type + " " + arg(arg);
+		return useType(arg.getType()) + " " + arg(arg);
 	}
 
 	private String lit(LiteralArg arg) {
@@ -144,13 +132,6 @@ public class InsnGen {
 	}
 
 	private String useType(ArgType type) {
-		if (type.isObject())
-			return mgen.getClassGen().useClass(type);
-		else
-			return translate(type);
-	}
-
-	private String translate(ArgType type) {
 		return TypeGen.translate(mgen.getClassGen(), type);
 	}
 
@@ -160,7 +141,6 @@ public class InsnGen {
 
 	private void makeInsn(InsnNode insn, CodeWriter code, boolean bodyOnly) throws CodegenException {
 		try {
-			// code.startLine("/* " + insn + "*/");
 			EnumSet<InsnGenState> state = EnumSet.noneOf(InsnGenState.class);
 			if (bodyOnly) {
 				state.add(InsnGenState.BODY_ONLY);
@@ -213,7 +193,7 @@ public class InsnGen {
 			case CHECK_CAST:
 			case CAST:
 				code.add("((");
-				code.add(translate(((ArgType) ((IndexInsnNode) insn).getIndex())));
+				code.add(useType(((ArgType) ((IndexInsnNode) insn).getIndex())));
 				code.add(") (");
 				code.add(arg(insn.getArg(0)));
 				code.add("))");
@@ -445,7 +425,7 @@ public class InsnGen {
 		}
 		int len = str.length();
 		str.delete(len - 2, len);
-		code.add("new ").add(translate(elType)).add("[] { ").add(str.toString()).add(" }");
+		code.add("new ").add(useType(elType)).add("[] { ").add(str.toString()).add(" }");
 	}
 
 	private void makeConstructor(ConstructorInsn insn, CodeWriter code, EnumSet<InsnGenState> state)

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

@@ -81,13 +81,12 @@ public class MethodGen {
 			if (mth.getAccessFlags().isConstructor()) {
 				code.add(classGen.getClassNode().getShortName()); // constructor
 			} else {
-				code.add(TypeGen.translate(classGen, mth.getMethodInfo().getReturnType()));
-				code.add(" ");
+				code.add(TypeGen.translate(classGen, mth.getReturnType()));
+				code.add(' ');
 				code.add(mth.getName());
 			}
-			code.add("(");
+			code.add('(');
 
-			mth.resetArgsTypes();
 			List<RegisterArg> args = mth.getArguments(false);
 			if (mth.getMethodInfo().isConstructor()
 					&& mth.getParentClass().getAttributes().contains(AttributeType.ENUM_CLASS)) {

src/main/java/jadx/dex/info/LocalVarInfo.java

@@ -28,7 +28,7 @@ public class LocalVarInfo extends RegisterArg {
 
 	private void init(String name, ArgType type, String sign) {
 		if (sign != null) {
-			type = ArgType.generic(type.getObject(), sign);
+			type = ArgType.generic(sign);
 		}
 		TypedVar tv = new TypedVar(type);
 		tv.setName(name);

src/main/java/jadx/dex/instructions/InsnDecoder.java

@@ -401,7 +401,7 @@ public class InsnDecoder {
 			case Opcodes.RETURN_OBJECT:
 				return insn(InsnType.RETURN,
 						null,
-						InsnArg.reg(insn, 0, method.getMethodInfo().getReturnType()));
+						InsnArg.reg(insn, 0, method.getReturnType()));
 
 			case Opcodes.INSTANCE_OF: {
 				InsnNode node = new IndexInsnNode(method, InsnType.INSTANCE_OF, dex.getType(insn.getIndex()), 1);

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

@@ -24,6 +24,7 @@ public abstract class ArgType {
 	public static final ArgType THROWABLE = object(Consts.CLASS_THROWABLE);
 
 	public static final ArgType UNKNOWN = unknown(PrimitiveType.values());
+	public static final ArgType UNKNOWN_OBJECT = unknown(PrimitiveType.OBJECT, PrimitiveType.ARRAY);
 
 	public static final ArgType NARROW = unknown(
 			PrimitiveType.INT, PrimitiveType.FLOAT,
@@ -32,8 +33,6 @@ public abstract class ArgType {
 
 	public static final ArgType WIDE = unknown(PrimitiveType.LONG, PrimitiveType.DOUBLE);
 
-	public static final ArgType UNKNOWN_OBJECT = unknown(PrimitiveType.OBJECT, PrimitiveType.ARRAY);
-
 	protected int hash;
 
 	private static ArgType primitive(PrimitiveType stype) {
@@ -41,11 +40,15 @@ public abstract class ArgType {
 	}
 
 	public static ArgType object(String obj) {
-		return new ObjectArg(Utils.cleanObjectName(obj));
+		return new ObjectArg(obj);
 	}
 
-	public static ArgType generic(String obj, String signature) {
-		return new GenericObjectArg(obj, signature);
+	public static ArgType generic(String sign) {
+		return parseSignature(sign);
+	}
+
+	public static ArgType generic(String obj, ArgType[] generics) {
+		return new GenericObjectArg(obj, generics);
 	}
 
 	public static ArgType array(ArgType vtype) {
@@ -91,7 +94,7 @@ public abstract class ArgType {
 		private final String object;
 
 		public ObjectArg(String obj) {
-			this.object = obj;
+			this.object = Utils.cleanObjectName(obj);
 			this.hash = obj.hashCode();
 		}
 
@@ -119,9 +122,9 @@ public abstract class ArgType {
 	private static final class GenericObjectArg extends ObjectArg {
 		private final ArgType[] generics;
 
-		public GenericObjectArg(String obj, String signature) {
+		public GenericObjectArg(String obj, ArgType[] generics) {
 			super(obj);
-			this.generics = parseSignature(signature);
+			this.generics = generics;
 			this.hash = obj.hashCode() + 31 * Arrays.hashCode(generics);
 		}
 
@@ -132,7 +135,7 @@ public abstract class ArgType {
 
 		@Override
 		public String toString() {
-			return super.toString() + "<" + Arrays.toString(generics) + ">";
+			return super.toString() + "<" + Utils.arrayToString(generics) + ">";
 		}
 	}
 
@@ -177,7 +180,7 @@ public abstract class ArgType {
 
 		@Override
 		public String toString() {
-			return arrayElement.toString();
+			return arrayElement.toString() + "[]";
 		}
 	}
 
@@ -220,7 +223,7 @@ public abstract class ArgType {
 		@Override
 		public String toString() {
 			if (possibleTypes.length == PrimitiveType.values().length)
-				return "*";
+				return "?";
 			else
 				return "?" + Arrays.toString(possibleTypes);
 		}
@@ -363,30 +366,83 @@ public abstract class ArgType {
 		}
 	}
 
-	public static ArgType[] parseSignature(String signature) {
-		int b = signature.indexOf('<') + 1;
-		int e = signature.lastIndexOf('>');
-		String gens = signature.substring(b, e);
-		String[] split = gens.split(";");
-		ArgType[] result = new ArgType[split.length];
-		for (int i = 0; i < split.length; i++) {
-			String g = split[i];
-			switch (g.charAt(0)) {
+	public static ArgType parseSignature(String sign) {
+		int b = sign.indexOf('<');
+		if (b == -1)
+			return parse(sign);
+
+		String obj = sign.substring(0, b);
+		String genericsStr = sign.substring(b + 1, sign.length() - 2);
+		List<ArgType> generics = parseSignatureList(genericsStr);
+		ArgType res = generic(obj + ";", generics.toArray(new ArgType[generics.size()]));
+		return res;
+	}
+
+	public static List<ArgType> parseSignatureList(String str) {
+		List<ArgType> signs = new ArrayList<ArgType>(3);
+		if (str.equals("*")) {
+			signs.add(UNKNOWN);
+			return signs;
+		}
+
+		int obj = 0;
+		int objStart = 0;
+		int gen = 0;
+		int arr = 0;
+
+		int pos = 0;
+		ArgType type = null;
+		while (pos < str.length()) {
+			char c = str.charAt(pos);
+			switch (c) {
 				case 'L':
-					result[i] = object(g + ";");
+					if (obj == 0 && gen == 0) {
+						obj++;
+						objStart = pos;
+					}
 					break;
 
-				case '*':
-				case '?':
-					result[i] = UNKNOWN;
+				case ';':
+					if (obj == 1 && gen == 0) {
+						obj--;
+						String o = str.substring(objStart, pos + 1);
+						type = parseSignature(o);
+					}
+					break;
+
+				case '<':
+					gen++;
+					break;
+				case '>':
+					gen--;
+					break;
+
+				case '[':
+					arr++;
 					break;
 
 				default:
-					result[i] = UNKNOWN_OBJECT;
+					if (obj == 0 && gen == 0) {
+						type = parse(c);
+					}
 					break;
 			}
+
+			if (type != null) {
+				if (arr == 0) {
+					signs.add(type);
+				} else {
+					for (int i = 0; i < arr; i++) {
+						type = array(type);
+					}
+					signs.add(type);
+					arr = 0;
+				}
+				type = null;
+			}
+			pos++;
 		}
-		return result;
+		return signs;
 	}
 
 	private static ArgType parse(char f) {
@@ -410,7 +466,7 @@ public abstract class ArgType {
 			case 'V':
 				return VOID;
 		}
-		throw new RuntimeException("Unknown type: " + f);
+		return null;
 	}
 
 	public int getRegCount() {

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

@@ -2,7 +2,10 @@ package jadx.dex.nodes;
 
 import jadx.dex.attributes.AttrNode;
 import jadx.dex.attributes.AttributeFlag;
+import jadx.dex.attributes.AttributeType;
 import jadx.dex.attributes.JumpAttribute;
+import jadx.dex.attributes.annotations.Annotation;
+import jadx.dex.attributes.annotations.AnnotationsList;
 import jadx.dex.info.AccessInfo;
 import jadx.dex.info.AccessInfo.AFType;
 import jadx.dex.info.ClassInfo;
@@ -28,12 +31,16 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import com.android.dx.io.ClassData.Method;
 import com.android.dx.io.Code;
 import com.android.dx.io.Code.CatchHandler;
 import com.android.dx.io.Code.Try;
 
 public class MethodNode extends AttrNode implements ILoadable {
+	private static final Logger LOG = LoggerFactory.getLogger(MethodNode.class);
 
 	private final MethodInfo mthInfo;
 	private final ClassNode parentClass;
@@ -44,6 +51,7 @@ public class MethodNode extends AttrNode implements ILoadable {
 	private List<InsnNode> instructions;
 	private boolean noCode;
 
+	private ArgType retType;
 	private RegisterArg thisArg;
 	private List<RegisterArg> argsList;
 
@@ -65,7 +73,8 @@ public class MethodNode extends AttrNode implements ILoadable {
 		if (methodData.getCodeOffset() == 0) {
 			noCode = true;
 			regsCount = 0;
-			initArguments();
+			retType = mthInfo.getReturnType();
+			initArguments(mthInfo.getArgumentsTypes());
 		} else {
 			noCode = false;
 		}
@@ -81,6 +90,11 @@ public class MethodNode extends AttrNode implements ILoadable {
 			Code mthCode = dex.readCode(methodData);
 			regsCount = mthCode.getRegistersSize();
 
+			if (!parseSignature()) {
+				retType = mthInfo.getReturnType();
+				initArguments(mthInfo.getArgumentsTypes());
+			}
+
 			InsnDecoder decoder = new InsnDecoder(this, mthCode);
 			InsnNode[] insnByOffset = decoder.run();
 			instructions = new ArrayList<InsnNode>();
@@ -90,7 +104,6 @@ public class MethodNode extends AttrNode implements ILoadable {
 			}
 			((ArrayList<InsnNode>) instructions).trimToSize();
 
-			initArguments();
 			initTryCatches(mthCode, insnByOffset);
 			initJumps(insnByOffset);
 
@@ -116,8 +129,43 @@ public class MethodNode extends AttrNode implements ILoadable {
 		noCode = true;
 	}
 
-	private void initArguments() {
-		List<ArgType> args = mthInfo.getArgumentsTypes();
+	@SuppressWarnings("unchecked")
+	private boolean parseSignature() {
+		AnnotationsList aList = (AnnotationsList) getAttributes().get(AttributeType.ANNOTATION_LIST);
+		if (aList == null || aList.size() == 0)
+			return false;
+
+		Annotation a = aList.get("dalvik.annotation.Signature");
+		if (a == null)
+			return false;
+
+		String sign = Utils.mergeSignature((List<String>) a.getValues().get("value"));
+		int lastBracket = sign.indexOf(')');
+		String argsTypesStr = sign.substring(1, lastBracket);
+		String returnType = sign.substring(lastBracket + 1);
+
+		retType = ArgType.parseSignature(returnType);
+		if (mthInfo.getArgumentsTypes().isEmpty()) {
+			argsList = Collections.emptyList();
+			return true;
+		}
+
+		List<ArgType> argsTypes = ArgType.parseSignatureList(argsTypesStr);
+		if (argsTypes.size() != mthInfo.getArgumentsTypes().size()) {
+			if (!getParentClass().getAccessFlags().isEnum() && !mthInfo.isConstructor()) {
+				// error parsing signature
+				LOG.error("Wrong parse result: " + sign + " -> " + argsTypes
+						+ " must be: " + mthInfo.getArgumentsTypes()
+						// + " in method " + this
+						);
+			}
+			return false;
+		}
+		initArguments(argsTypes);
+		return true;
+	}
+
+	private void initArguments(List<ArgType> args) {
 		int pos;
 		if (!noCode) {
 			pos = regsCount;
@@ -134,6 +182,11 @@ public class MethodNode extends AttrNode implements ILoadable {
 			thisArg.getTypedVar().setName("this");
 		}
 
+		if (args.isEmpty()) {
+			argsList = Collections.emptyList();
+			return;
+		}
+
 		argsList = new ArrayList<RegisterArg>(args.size());
 		for (ArgType arg : args) {
 			argsList.add(InsnArg.reg(pos, arg));
@@ -156,15 +209,8 @@ public class MethodNode extends AttrNode implements ILoadable {
 		return thisArg;
 	}
 
-	// TODO: args types can change during type resolving => reset and copy back names
-	@Deprecated
-	public void resetArgsTypes() {
-		List<InsnArg> modArgs = new ArrayList<InsnArg>(argsList);
-		initArguments();
-
-		for (int i = 0; i < argsList.size(); i++) {
-			argsList.get(i).getTypedVar().setName(modArgs.get(i).getTypedVar().getName());
-		}
+	public ArgType getReturnType() {
+		return retType;
 	}
 
 	// move to external class
@@ -394,7 +440,7 @@ public class MethodNode extends AttrNode implements ILoadable {
 
 	@Override
 	public String toString() {
-		return mthInfo.getReturnType()
+		return retType
 				+ " " + parentClass.getFullName() + "." + mthInfo.getName()
 				+ "(" + Utils.listToString(mthInfo.getArgumentsTypes()) + ")";
 	}

src/main/java/jadx/dex/visitors/ConstInlinerVisitor.java

@@ -137,7 +137,7 @@ public class ConstInlinerVisitor extends AbstractVisitor {
 
 			case RETURN:
 				if (insn.getArgsCount() != 0) {
-					insn.getArg(0).merge(mth.getMethodInfo().getReturnType());
+					insn.getArg(0).merge(mth.getReturnType());
 				}
 				break;
 

src/main/java/jadx/dex/visitors/DotGraphVisitor.java

@@ -64,7 +64,7 @@ public class DotGraphVisitor extends AbstractVisitor {
 
 		dot.startLine("MethodNode[shape=record,label=\"{"
 				+ escape(mth.getAccessFlags().makeString())
-				+ escape(mth.getMethodInfo().getReturnType() + " "
+				+ escape(mth.getReturnType() + " "
 						+ mth.getParentClass().getFullName() + "." + mth.getName()
 						+ "(" + Utils.listToString(mth.getArguments(true)) + ") ")
 				+ (attrs.length() == 0 ? "" : " | " + attrs)

src/main/java/jadx/dex/visitors/regions/PostRegionVisitor.java

@@ -29,7 +29,7 @@ public class PostRegionVisitor extends AbstractVisitor {
 	 * Remove useless return at end
 	 */
 	private void removeReturn(MethodNode mth) {
-		if (!mth.getMethodInfo().getReturnType().equals(ArgType.VOID))
+		if (!mth.getReturnType().equals(ArgType.VOID))
 			return;
 
 		if (!(mth.getRegion() instanceof Region))

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

@@ -28,8 +28,13 @@ public class Utils {
 	}
 
 	public static String escape(String str) {
-		return str.replace('.', '_').replace('/', '_').replace(';', '_')
-				.replace('$', '_').replace("[]", "_A");
+		return str.replace('.', '_')
+				.replace('/', '_')
+				.replace(';', '_')
+				.replace('$', '_')
+				.replace('<', '_')
+				.replace('>', '_')
+				.replace("[]", "_A");
 	}
 
 	public static String listToString(Iterable<?> list) {
@@ -46,6 +51,16 @@ public class Utils {
 		return str.toString();
 	}
 
+	public static String arrayToString(Object[] array) {
+		StringBuilder sb = new StringBuilder();
+		for (int i = 0; i < array.length; i++) {
+			if (i != 0)
+				sb.append(", ");
+			sb.append(array[i]);
+		}
+		return sb.toString();
+	}
+
 	public static String getStackTrace(Throwable throwable) {
 		StringWriter sw = new StringWriter();
 		PrintWriter pw = new PrintWriter(sw, true);

src/samples/java/jadx/samples/TestCF3.java

@@ -68,6 +68,19 @@ public class TestCF3 extends AbstractTest {
 		return l1.size() == 0;
 	}
 
+	public boolean testNestedLoops2(List<String> list) {
+		int i = 0;
+		int j = 0;
+		while (i < list.size()) {
+			String s = list.get(i);
+			while (j < s.length()) {
+				j++;
+			}
+			i++;
+		}
+		return j > 10;
+	}
+
 	public static boolean testLabeledBreakContinue() {
 		String searchMe = "Look for a substring in me";
 		String substring = "sub";

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

@@ -0,0 +1,35 @@
+package jadx.samples;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class TestGenerics extends AbstractTest {
+
+	private List<String> test1(Map<String, String> map) {
+		List<String> list = new ArrayList<String>();
+		String str = map.get("key");
+		list.add(str);
+		return list;
+	}
+
+	public void test2(Map<String, String> map, List<Object> list) {
+		String str = map.get("key");
+		list.add(str);
+	}
+
+	public void test3(List<Object> list, int a, float[] b, String[] c, String[][][] d) {
+
+	}
+
+	@Override
+	public boolean testRun() throws Exception {
+		assertTrue(test1(new HashMap<String, String>()) != null);
+		return true;
+	}
+
+	public static void main(String[] args) throws Exception {
+		new TestGenerics().testRun();
+	}
+}