core: fix duplicate regions creation (#314)

jadx-core/src/main/java/jadx/core/dex/instructions/GotoNode.java

@@ -5,7 +5,7 @@ import jadx.core.utils.InsnUtils;
 
 public class GotoNode extends TargetInsnNode {
 
-	protected int target;
+	protected final int target;
 
 	public GotoNode(int target) {
 		this(InsnType.GOTO, target, 0);

jadx-core/src/main/java/jadx/core/dex/instructions/IfNode.java

@@ -47,7 +47,6 @@ public class IfNode extends GotoNode {
 		BlockNode tmp = thenBlock;
 		thenBlock = elseBlock;
 		elseBlock = tmp;
-		target = thenBlock.getStartOffset();
 	}
 
 	public void changeCondition(IfOp op, InsnArg arg1, InsnArg arg2) {
@@ -89,6 +88,11 @@ public class IfNode extends GotoNode {
 	}
 
 	@Override
+	public int getTarget() {
+		return thenBlock == null ? target : thenBlock.getStartOffset();
+	}
+
+	@Override
 	public boolean isSame(InsnNode obj) {
 		if (this == obj) {
 			return true;

jadx-core/src/main/java/jadx/core/dex/nodes/ClassNode.java

@@ -240,7 +240,6 @@ public class ClassNode extends LineAttrNode implements ILoadable, IDexNode {
 			}
 		}
 		this.addAttr(new SourceFileAttr(fileName));
-		LOG.debug("Class '{}' compiled from '{}'", this, fileName);
 	}
 
 	@Override
@@ -486,7 +485,6 @@ public class ClassNode extends LineAttrNode implements ILoadable, IDexNode {
 			return clsInfo.equals(other.clsInfo);
 		}
 		return false;
-
 	}
 
 	@Override

jadx-core/src/main/java/jadx/core/dex/regions/Region.java

@@ -5,6 +5,7 @@ import java.util.List;
 
 import jadx.core.dex.nodes.IContainer;
 import jadx.core.dex.nodes.IRegion;
+import jadx.core.utils.Utils;
 
 public final class Region extends AbstractRegion {
 
@@ -39,15 +40,19 @@ public final class Region extends AbstractRegion {
 	@Override
 	public String baseString() {
 		StringBuilder sb = new StringBuilder();
-		sb.append(blocks.size());
-		for (IContainer cont : blocks) {
-			sb.append(cont.baseString());
-		}
+		int size = blocks.size();
+		sb.append('(');
+		sb.append(size);
+		if (size > 0) {
+			sb.append(':');
+			Utils.listToString(sb, blocks, "|", IContainer::baseString);
+		}
+		sb.append(')');
 		return sb.toString();
 	}
 
 	@Override
 	public String toString() {
-		return "R:" + baseString();
+		return "R" + baseString();
 	}
 }

jadx-core/src/main/java/jadx/core/dex/regions/conditions/IfCondition.java

@@ -142,11 +142,10 @@ public final class IfCondition {
 			Compare c = cond.getCompare();
 			simplifyCmpOp(c);
 			if (c.getOp() == IfOp.EQ && c.getB().isLiteral() && c.getB().equals(LiteralArg.FALSE)) {
-				return not(new IfCondition(c.invert()));
+				cond = not(new IfCondition(c.invert()));
 			} else {
 				c.normalize();
 			}
-			return cond;
 		}
 		List<IfCondition> args = null;
 		for (int i = 0; i < cond.getArgs().size(); i++) {
@@ -225,7 +224,7 @@ public final class IfCondition {
 			case TERNARY:
 				return first() + " ? " + second() + " : " + third();
 			case NOT:
-				return "!" + first();
+				return "!(" + first() + ")";
 			case AND:
 			case OR:
 				String op = mode == Mode.OR ? " || " : " && ";

jadx-core/src/main/java/jadx/core/dex/visitors/blocksmaker/BlockProcessor.java

@@ -79,7 +79,6 @@ public class BlockProcessor extends AbstractVisitor {
 
 	private static boolean removeEmptyBlock(BlockNode block) {
 		if (canRemoveBlock(block)) {
-			LOG.debug("Removing empty block: {}", block);
 			if (block.getSuccessors().size() == 1) {
 				BlockNode successor = block.getSuccessors().get(0);
 				block.getPredecessors().forEach(pred -> {

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

@@ -12,7 +12,6 @@ import java.util.Set;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import jadx.core.Consts;
 import jadx.core.dex.attributes.AFlag;
 import jadx.core.dex.attributes.AType;
 import jadx.core.dex.attributes.nodes.EdgeInsnAttr;
@@ -43,7 +42,6 @@ import jadx.core.utils.BlockUtils;
 import jadx.core.utils.ErrorsCounter;
 import jadx.core.utils.InstructionRemover;
 import jadx.core.utils.RegionUtils;
-import jadx.core.utils.exceptions.JadxOverflowException;
 import jadx.core.utils.exceptions.JadxRuntimeException;
 
 import static jadx.core.dex.visitors.regions.IfMakerHelper.confirmMerge;
@@ -62,12 +60,20 @@ public class RegionMaker {
 
 	private final MethodNode mth;
 	private int regionsCount;
+	private Region[] regionByBlock;
 
 	public RegionMaker(MethodNode mth) {
 		this.mth = mth;
+		this.regionByBlock = new Region[mth.getBasicBlocks().size()];
 	}
 
 	public Region makeRegion(BlockNode startBlock, RegionStack stack) {
+		int startBlockId = startBlock.getId();
+		Region region = regionByBlock[startBlockId];
+		if (region != null) {
+			return region;
+		}
+
 		Region r = new Region(stack.peekRegion());
 		BlockNode next = startBlock;
 		while (next != null) {
@@ -77,6 +83,7 @@ public class RegionMaker {
 				throw new JadxRuntimeException("Regions count limit reached");
 			}
 		}
+		regionByBlock[startBlockId] = r;
 		return r;
 	}
 

jadx-core/src/main/java/jadx/core/utils/BlockUtils.java

@@ -79,9 +79,7 @@ public class BlockUtils {
 		}
 		if (b.contains(AFlag.SYNTHETIC)) {
 			List<BlockNode> s = b.getSuccessors();
-			if (s.size() == 1 && s.get(0).contains(AType.EXC_HANDLER)) {
-				return true;
-			}
+			return s.size() == 1 && s.get(0).contains(AType.EXC_HANDLER);
 		}
 		return false;
 	}
@@ -156,7 +154,10 @@ public class BlockUtils {
 	}
 
 	@Nullable
-	public static InsnNode getLastInsn(IBlock block) {
+	public static InsnNode getLastInsn(@Nullable IBlock block) {
+		if (block == null) {
+			return null;
+		}
 		List<InsnNode> insns = block.getInstructions();
 		if (insns.isEmpty()) {
 			return null;

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

@@ -4,6 +4,7 @@ import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.util.Arrays;
 import java.util.Iterator;
+import java.util.function.Function;
 
 import jadx.api.JadxDecompiler;
 
@@ -26,19 +27,30 @@ public class Utils {
 		return 'L' + obj.replace('.', '/') + ';';
 	}
 
-	public static String listToString(Iterable<?> list) {
-		if (list == null) {
+	public static String listToString(Iterable<?> objects) {
+		return listToString(objects, ", ");
+	}
+
+	public static String listToString(Iterable<?> objects, String joiner) {
+		if (objects == null) {
 			return "";
 		}
-		StringBuilder str = new StringBuilder();
-		for (Iterator<?> it = list.iterator(); it.hasNext(); ) {
-			Object o = it.next();
-			str.append(o);
+		StringBuilder sb = new StringBuilder();
+		listToString(sb, objects, joiner, Object::toString);
+		return sb.toString();
+	}
+
+	public static <T> void listToString(StringBuilder sb, Iterable<T> objects, String joiner, Function<T, String> toStr) {
+		if (objects == null) {
+			return;
+		}
+		Iterator<T> it = objects.iterator();
 		if (it.hasNext()) {
-				str.append(", ");
+			sb.append(toStr.apply(it.next()));
 		}
+		while (it.hasNext()) {
+			sb.append(joiner).append(toStr.apply(it.next()));
 		}
-		return str.toString();
 	}
 
 	public static String arrayToString(Object[] array) {