core: redone return blocks splitting for fix issue #4

jadx-core/src/main/java/jadx/core/dex/visitors/regions/FinishRegions.java

 package jadx.core.dex.visitors.regions;
 
-import jadx.core.dex.instructions.InsnType;
-import jadx.core.dex.instructions.args.ArgType;
 import jadx.core.dex.nodes.BlockNode;
 import jadx.core.dex.nodes.IBlock;
 import jadx.core.dex.nodes.IRegion;
-import jadx.core.dex.nodes.InsnNode;
 import jadx.core.dex.nodes.MethodNode;
 import jadx.core.dex.regions.LoopRegion;
 
 import java.util.Iterator;
-import java.util.List;
 
 public class FinishRegions extends TracedRegionVisitor {
 	@Override
@@ -21,6 +17,8 @@ public class FinishRegions extends TracedRegionVisitor {
 		BlockNode block = (BlockNode) container;
 
 		// remove last return in void functions
+		/*
+		BlockNode block = (BlockNode) container;
 		if (block.getCleanSuccessors().isEmpty()
 				&& mth.getReturnType().equals(ArgType.VOID)) {
 			List<InsnNode> insns = block.getInstructions();
@@ -33,6 +31,7 @@ public class FinishRegions extends TracedRegionVisitor {
 				}
 			}
 		}
+		*/
 	}
 
 	private boolean blockNotInLoop(MethodNode mth, BlockNode block) {

jadx-core/src/main/java/jadx/core/dex/visitors/regions/RegionMaker.java

@@ -4,7 +4,6 @@ import jadx.core.Consts;
 import jadx.core.dex.attributes.AttributeFlag;
 import jadx.core.dex.attributes.AttributeType;
 import jadx.core.dex.attributes.AttributesList;
-import jadx.core.dex.attributes.ForceReturnAttr;
 import jadx.core.dex.attributes.IAttribute;
 import jadx.core.dex.attributes.LoopAttr;
 import jadx.core.dex.instructions.IfNode;
@@ -258,6 +257,7 @@ public class RegionMaker {
 				while (next != null) {
 					if (isPathExists(loopExit, next)) {
 						// found cross
+						/*
 						if (next.getCleanSuccessors().size() == 1) {
 							BlockNode r = BlockUtils.getNextBlock(next);
 							if (r != null
@@ -265,13 +265,14 @@ public class RegionMaker {
 									&& r.getInstructions().size() > 0
 									&& r.getInstructions().get(0).getType() == InsnType.RETURN) {
 								next.getAttributes().add(new ForceReturnAttr(r.getInstructions().get(0)));
-							} /*/ else {
+							} else {
 								next.getAttributes().add(AttributeFlag.BREAK);
 								stack.addExit(r);
-							} /**/
+							}
 						} else {
 							stack.addExit(next);
 						}
+						*/
 						break;
 					}
 					next = BlockUtils.getNextBlock(next);

jadx-core/src/main/java/jadx/core/dex/visitors/typeresolver/TypeResolver.java

@@ -67,7 +67,6 @@ public class TypeResolver extends AbstractVisitor {
 					state.assignReg(insn.getResult());
 			}
 
-			if (block.getSuccessors().size() > 0)
 			block.setEndState(new BlockRegState(state));
 		}
 	}

jadx-samples/src/main/java/jadx/samples/TestCF4.java

+package jadx.samples;
+
+public class TestCF4 extends AbstractTest {
+
+	int c;
+	String d;
+	String f;
+
+	public void testComplexIf(String a, int b) {
+		if (d == null || (c == 0 && b != -1 && d.length() == 0)) {
+			c = a.codePointAt(c);
+		} else {
+			if (a.length() != 2) {
+				c = f.compareTo(a);
+			}
+		}
+	}
+
+	public void checkComplexIf() {
+		d = null;
+		f = null;
+		c = 2;
+		testComplexIf("abcdef", 0);
+		assertEquals(c, (int) 'c');
+
+		d = "";
+		f = null;
+		c = 0;
+		testComplexIf("abcdef", 0);
+		assertEquals(c, (int) 'a');
+
+		d = "";
+		f = "1";
+		c = 777;
+		testComplexIf("ab", -1);
+		assertEquals(c, 777);
+	}
+
+	@Override
+	public boolean testRun() throws Exception {
+		checkComplexIf();
+		return true;
+	}
+
+	public static void main(String[] args) throws Exception {
+		new TestCF4().testRun();
+	}
+}