core: omit 'this' for methods and fields

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

@@ -125,7 +125,21 @@ public class InsnGen {
 	}
 
 	private String ifield(FieldInfo field, InsnArg arg) throws CodegenException {
-		return arg(arg) + "." + field.getName();
+		String name = field.getName();
+		if (arg.isThis()) {
+			boolean useShort = true;
+			List<RegisterArg> args = mth.getArguments(false);
+			for (RegisterArg param : args) {
+				String paramName = param.getTypedVar().getName();
+				if (paramName != null && paramName.equals(name)) {
+					useShort = false;
+				}
+			}
+			if (useShort) {
+				return name; // FIXME: check variable names in scope
+			}
+		}
+		return arg(arg) + "." + name;
 	}
 
 	private String sfield(FieldInfo field) {
@@ -531,7 +545,10 @@ public class InsnGen {
 			case DIRECT:
 			case VIRTUAL:
 			case INTERFACE:
-				code.add(arg(insn.getArg(0))).add('.');
+				InsnArg arg = insn.getArg(0);
+				if (!arg.isThis()) { // FIXME: add 'this' for equals methods in scope
+					code.add(arg(arg)).add('.');
+				}
 				k++;
 				break;
 

jadx-core/src/test/java/jadx/tests/internal/TestRedundantThis.java

@@ -0,0 +1,43 @@
+package jadx.tests.internal;
+
+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 TestRedundantThis extends InternalJadxTest {
+
+	public static class TestCls {
+		public int field1 = 1;
+		public int field2 = 2;
+
+		public boolean f1() {
+			return false;
+		}
+
+		public int method() {
+			f1();
+			return field1;
+		}
+
+		public void method2(int field2) {
+			this.field2 = field2;
+		}
+	}
+
+	@Test
+	public void test() {
+		ClassNode cls = getClassNode(TestCls.class);
+
+		String code = cls.getCode().toString();
+
+		assertThat(code, not(containsString("this.f1();")));
+		assertThat(code, not(containsString("return this.field1;")));
+
+		assertThat(code, containsString("this.field2 = field2;"));
+	}
+}