refactor: move code shrink visitor to separate package and extract inner classes

jadx-core/src/main/java/jadx/core/Jadx.java

@@ -11,7 +11,7 @@ import org.slf4j.LoggerFactory;
 
 import jadx.api.JadxArgs;
 import jadx.core.dex.visitors.ClassModifier;
-import jadx.core.dex.visitors.CodeShrinker;
+import jadx.core.dex.visitors.shrink.CodeShrinkVisitor;
 import jadx.core.dex.visitors.ConstInlineVisitor;
 import jadx.core.dex.visitors.ConstructorVisitor;
 import jadx.core.dex.visitors.DependencyCollector;
@@ -81,7 +81,7 @@ public class Jadx {
 			passes.add(new DebugInfoApplyVisitor());
 
 			passes.add(new ModVisitor());
-			passes.add(new CodeShrinker());
+			passes.add(new CodeShrinkVisitor());
 			passes.add(new ReSugarCode());
 			if (args.isCfgOutput()) {
 				passes.add(DotGraphVisitor.dump());
@@ -92,7 +92,7 @@ public class Jadx {
 			passes.add(new ReturnVisitor());
 			passes.add(new CleanRegions());
 
-			passes.add(new CodeShrinker());
+			passes.add(new CodeShrinkVisitor());
 			passes.add(new SimplifyVisitor());
 			passes.add(new CheckRegions());
 

jadx-core/src/main/java/jadx/core/dex/visitors/EnumVisitor.java

@@ -26,6 +26,7 @@ import jadx.core.dex.nodes.DexNode;
 import jadx.core.dex.nodes.FieldNode;
 import jadx.core.dex.nodes.InsnNode;
 import jadx.core.dex.nodes.MethodNode;
+import jadx.core.dex.visitors.shrink.CodeShrinkVisitor;
 import jadx.core.utils.ErrorsCounter;
 import jadx.core.utils.InsnUtils;
 import jadx.core.utils.exceptions.JadxException;
@@ -33,7 +34,7 @@ import jadx.core.utils.exceptions.JadxException;
 @JadxVisitor(
 		name = "EnumVisitor",
 		desc = "Restore enum classes",
-		runAfter = {CodeShrinker.class, ModVisitor.class}
+		runAfter = {CodeShrinkVisitor.class, ModVisitor.class}
 )
 public class EnumVisitor extends AbstractVisitor {
 

jadx-core/src/main/java/jadx/core/dex/visitors/MethodInlineVisitor.java

@@ -21,6 +21,7 @@ import jadx.core.dex.nodes.BlockNode;
 import jadx.core.dex.nodes.FieldNode;
 import jadx.core.dex.nodes.InsnNode;
 import jadx.core.dex.nodes.MethodNode;
+import jadx.core.dex.visitors.shrink.CodeShrinkVisitor;
 import jadx.core.utils.exceptions.JadxException;
 
 @JadxVisitor(
@@ -77,7 +78,7 @@ public class MethodInlineVisitor extends AbstractVisitor {
 					&& get.getResult().equalRegisterAndType((RegisterArg) retArg)) {
 				RegisterArg retReg = (RegisterArg) retArg;
 				retReg.getSVar().removeUse(retReg);
-				CodeShrinker.shrinkMethod(mth);
+				CodeShrinkVisitor.shrinkMethod(mth);
 
 				insnList = firstBlock.getInstructions();
 				if (insnList.size() == 1) {

jadx-core/src/main/java/jadx/core/dex/visitors/ModVisitor.java

@@ -37,6 +37,7 @@ import jadx.core.dex.nodes.InsnNode;
 import jadx.core.dex.nodes.MethodNode;
 import jadx.core.dex.trycatch.ExcHandlerAttr;
 import jadx.core.dex.trycatch.ExceptionHandler;
+import jadx.core.dex.visitors.shrink.CodeShrinkVisitor;
 import jadx.core.utils.ErrorsCounter;
 import jadx.core.utils.InsnUtils;
 import jadx.core.utils.InstructionRemover;
@@ -51,7 +52,7 @@ import static jadx.core.utils.BlockUtils.replaceInsn;
 @JadxVisitor(
 		name = "ModVisitor",
 		desc = "Modify method instructions",
-		runBefore = CodeShrinker.class
+		runBefore = CodeShrinkVisitor.class
 )
 public class ModVisitor extends AbstractVisitor {
 	private static final Logger LOG = LoggerFactory.getLogger(ModVisitor.class);

jadx-core/src/main/java/jadx/core/dex/visitors/PrepareForCodeGen.java

@@ -15,6 +15,7 @@ import jadx.core.dex.nodes.BlockNode;
 import jadx.core.dex.nodes.InsnNode;
 import jadx.core.dex.nodes.MethodNode;
 import jadx.core.dex.visitors.regions.variables.ProcessVariables;
+import jadx.core.dex.visitors.shrink.CodeShrinkVisitor;
 import jadx.core.utils.exceptions.JadxException;
 
 /**
@@ -25,7 +26,7 @@ import jadx.core.utils.exceptions.JadxException;
 @JadxVisitor(
 		name = "PrepareForCodeGen",
 		desc = "Prepare instructions for code generation pass",
-		runAfter = {CodeShrinker.class, ClassModifier.class, ProcessVariables.class}
+		runAfter = {CodeShrinkVisitor.class, ClassModifier.class, ProcessVariables.class}
 )
 public class PrepareForCodeGen extends AbstractVisitor {
 

jadx-core/src/main/java/jadx/core/dex/visitors/ReSugarCode.java

@@ -30,6 +30,7 @@ import jadx.core.dex.nodes.DexNode;
 import jadx.core.dex.nodes.FieldNode;
 import jadx.core.dex.nodes.InsnNode;
 import jadx.core.dex.nodes.MethodNode;
+import jadx.core.dex.visitors.shrink.CodeShrinkVisitor;
 import jadx.core.utils.InsnList;
 import jadx.core.utils.InsnUtils;
 import jadx.core.utils.InstructionRemover;
@@ -39,7 +40,7 @@ import jadx.core.utils.exceptions.JadxException;
 @JadxVisitor(
 		name = "ReSugarCode",
 		desc = "Simplify synthetic or verbose code",
-		runAfter = CodeShrinker.class
+		runAfter = CodeShrinkVisitor.class
 )
 public class ReSugarCode extends AbstractVisitor {
 

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

@@ -33,7 +33,7 @@ import jadx.core.dex.regions.loops.ForLoop;
 import jadx.core.dex.regions.loops.LoopRegion;
 import jadx.core.dex.regions.loops.LoopType;
 import jadx.core.dex.visitors.AbstractVisitor;
-import jadx.core.dex.visitors.CodeShrinker;
+import jadx.core.dex.visitors.shrink.CodeShrinkVisitor;
 import jadx.core.dex.visitors.JadxVisitor;
 import jadx.core.dex.visitors.regions.variables.ProcessVariables;
 import jadx.core.utils.BlockUtils;
@@ -206,7 +206,7 @@ public class LoopRegionVisitor extends AbstractVisitor implements IRegionVisitor
 		if (arrayArg.isRegister()) {
 			((RegisterArg) arrayArg).getSVar().removeUse((RegisterArg) arrGetInsn.getArg(0));
 		}
-		CodeShrinker.shrinkMethod(mth);
+		CodeShrinkVisitor.shrinkMethod(mth);
 		len.add(AFlag.DONT_GENERATE);
 
 		if (arrGetInsn.contains(AFlag.WRAPPED)) {

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

@@ -17,7 +17,7 @@ import jadx.core.dex.nodes.InsnNode;
 import jadx.core.dex.nodes.MethodNode;
 import jadx.core.dex.regions.Region;
 import jadx.core.dex.regions.conditions.IfRegion;
-import jadx.core.dex.visitors.CodeShrinker;
+import jadx.core.dex.visitors.shrink.CodeShrinkVisitor;
 import jadx.core.utils.InsnList;
 
 public class TernaryMod {
@@ -89,7 +89,7 @@ public class TernaryMod {
 			header.getInstructions().add(ternInsn);
 
 			// shrink method again
-			CodeShrinker.shrinkMethod(mth);
+			CodeShrinkVisitor.shrinkMethod(mth);
 			return true;
 		}
 
@@ -120,7 +120,7 @@ public class TernaryMod {
 			header.getInstructions().add(retInsn);
 			header.add(AFlag.RETURN);
 
-			CodeShrinker.shrinkMethod(mth);
+			CodeShrinkVisitor.shrinkMethod(mth);
 			return true;
 		}
 		return false;

jadx-core/src/main/java/jadx/core/dex/visitors/shrink/ArgsInfo.java

@@ -0,0 +1,142 @@
+package jadx.core.dex.visitors.shrink;
+
+import java.util.BitSet;
+import java.util.LinkedList;
+import java.util.List;
+
+import jadx.core.dex.instructions.InsnType;
+import jadx.core.dex.instructions.args.InsnArg;
+import jadx.core.dex.instructions.args.InsnWrapArg;
+import jadx.core.dex.instructions.args.RegisterArg;
+import jadx.core.dex.instructions.mods.ConstructorInsn;
+import jadx.core.dex.instructions.mods.TernaryInsn;
+import jadx.core.dex.nodes.InsnNode;
+import jadx.core.utils.EmptyBitSet;
+import jadx.core.utils.exceptions.JadxRuntimeException;
+
+final class ArgsInfo {
+	private final InsnNode insn;
+	private final List<ArgsInfo> argsList;
+	private final List<RegisterArg> args;
+	private final int pos;
+	private int inlineBorder;
+	private ArgsInfo inlinedInsn;
+
+	public ArgsInfo(InsnNode insn, List<ArgsInfo> argsList, int pos) {
+		this.insn = insn;
+		this.argsList = argsList;
+		this.pos = pos;
+		this.inlineBorder = pos;
+		this.args = getArgs(insn);
+	}
+
+	public static List<RegisterArg> getArgs(InsnNode insn) {
+		List<RegisterArg> args = new LinkedList<>();
+		addArgs(insn, args);
+		return args;
+	}
+
+	private static void addArgs(InsnNode insn, List<RegisterArg> args) {
+		if (insn.getType() == InsnType.CONSTRUCTOR) {
+			args.add(((ConstructorInsn) insn).getInstanceArg());
+		} else if (insn.getType() == InsnType.TERNARY) {
+			args.addAll(((TernaryInsn) insn).getCondition().getRegisterArgs());
+		}
+		for (InsnArg arg : insn.getArguments()) {
+			if (arg.isRegister()) {
+				args.add((RegisterArg) arg);
+			}
+		}
+		for (InsnArg arg : insn.getArguments()) {
+			if (arg.isInsnWrap()) {
+				addArgs(((InsnWrapArg) arg).getWrapInsn(), args);
+			}
+		}
+	}
+
+	public InsnNode getInsn() {
+		return insn;
+	}
+
+	List<RegisterArg> getArgs() {
+		return args;
+	}
+
+	public WrapInfo checkInline(int assignPos, RegisterArg arg) {
+		if (assignPos >= inlineBorder || !canMove(assignPos, inlineBorder)) {
+			return null;
+		}
+		inlineBorder = assignPos;
+		return inline(assignPos, arg);
+	}
+
+	private boolean canMove(int from, int to) {
+		ArgsInfo startInfo = argsList.get(from);
+		List<RegisterArg> movedArgs = startInfo.getArgs();
+		int start = from + 1;
+		if (start == to) {
+			// previous instruction or on edge of inline border
+			return true;
+		}
+		if (start > to) {
+			throw new JadxRuntimeException("Invalid inline insn positions: " + start + " - " + to);
+		}
+		BitSet movedSet;
+		if (movedArgs.isEmpty()) {
+			if (startInfo.insn.isConstInsn()) {
+				return true;
+			}
+			movedSet = EmptyBitSet.EMPTY;
+		} else {
+			movedSet = new BitSet();
+			for (RegisterArg arg : movedArgs) {
+				movedSet.set(arg.getRegNum());
+			}
+		}
+		for (int i = start; i < to; i++) {
+			ArgsInfo argsInfo = argsList.get(i);
+			if (argsInfo.getInlinedInsn() == this) {
+				continue;
+			}
+			InsnNode curInsn = argsInfo.insn;
+			if (!curInsn.canReorder() || usedArgAssign(curInsn, movedSet)) {
+				return false;
+			}
+		}
+		return true;
+	}
+
+	static boolean usedArgAssign(InsnNode insn, BitSet args) {
+		if (args.isEmpty()) {
+			return false;
+		}
+		RegisterArg result = insn.getResult();
+		if (result == null || result.isField()) {
+			return false;
+		}
+		return args.get(result.getRegNum());
+	}
+
+	WrapInfo inline(int assignInsnPos, RegisterArg arg) {
+		ArgsInfo argsInfo = argsList.get(assignInsnPos);
+		argsInfo.inlinedInsn = this;
+		return new WrapInfo(argsInfo.insn, arg);
+	}
+
+	ArgsInfo getInlinedInsn() {
+		if (inlinedInsn != null) {
+			ArgsInfo parent = inlinedInsn.getInlinedInsn();
+			if (parent != null) {
+				inlinedInsn = parent;
+			}
+		}
+		return inlinedInsn;
+	}
+
+	@Override
+	public String toString() {
+		return "ArgsInfo: |" + inlineBorder
+				+ " ->" + (inlinedInsn == null ? "-" : inlinedInsn.pos)
+				+ " " + args + " : " + insn;
+	}
+}

jadx-core/src/main/java/jadx/core/dex/visitors/shrink/CodeShrinkVisitor.java

@@ -1,8 +1,7 @@
-package jadx.core.dex.visitors;
+package jadx.core.dex.visitors.shrink;
 
 import java.util.ArrayList;
 import java.util.BitSet;
-import java.util.LinkedList;
 import java.util.List;
 import java.util.ListIterator;
 import java.util.Set;
@@ -13,17 +12,22 @@ import jadx.core.dex.instructions.args.InsnArg;
 import jadx.core.dex.instructions.args.InsnWrapArg;
 import jadx.core.dex.instructions.args.RegisterArg;
 import jadx.core.dex.instructions.args.SSAVar;
-import jadx.core.dex.instructions.mods.ConstructorInsn;
-import jadx.core.dex.instructions.mods.TernaryInsn;
 import jadx.core.dex.nodes.BlockNode;
 import jadx.core.dex.nodes.InsnNode;
 import jadx.core.dex.nodes.MethodNode;
+import jadx.core.dex.visitors.AbstractVisitor;
+import jadx.core.dex.visitors.JadxVisitor;
+import jadx.core.dex.visitors.ModVisitor;
 import jadx.core.utils.BlockUtils;
-import jadx.core.utils.EmptyBitSet;
 import jadx.core.utils.InsnList;
 import jadx.core.utils.exceptions.JadxRuntimeException;
 
-public class CodeShrinker extends AbstractVisitor {
+@JadxVisitor(
+		name = "CodeShrinkVisitor",
+		desc = "Inline variables for make code smaller",
+		runAfter = {ModVisitor.class}
+)
+public class CodeShrinkVisitor extends AbstractVisitor {
 
 	@Override
 	public void visit(MethodNode mth) {
@@ -40,156 +44,6 @@ public class CodeShrinker extends AbstractVisitor {
 		}
 	}
 
-	private static final class ArgsInfo {
-		private final InsnNode insn;
-		private final List<ArgsInfo> argsList;
-		private final List<RegisterArg> args;
-		private final int pos;
-		private int inlineBorder;
-		private ArgsInfo inlinedInsn;
-
-		public ArgsInfo(InsnNode insn, List<ArgsInfo> argsList, int pos) {
-			this.insn = insn;
-			this.argsList = argsList;
-			this.pos = pos;
-			this.inlineBorder = pos;
-			this.args = getArgs(insn);
-		}
-
-		public static List<RegisterArg> getArgs(InsnNode insn) {
-			List<RegisterArg> args = new LinkedList<>();
-			addArgs(insn, args);
-			return args;
-		}
-
-		private static void addArgs(InsnNode insn, List<RegisterArg> args) {
-			if (insn.getType() == InsnType.CONSTRUCTOR) {
-				args.add(((ConstructorInsn) insn).getInstanceArg());
-			} else if (insn.getType() == InsnType.TERNARY) {
-				args.addAll(((TernaryInsn) insn).getCondition().getRegisterArgs());
-			}
-			for (InsnArg arg : insn.getArguments()) {
-				if (arg.isRegister()) {
-					args.add((RegisterArg) arg);
-				}
-			}
-			for (InsnArg arg : insn.getArguments()) {
-				if (arg.isInsnWrap()) {
-					addArgs(((InsnWrapArg) arg).getWrapInsn(), args);
-				}
-			}
-		}
-
-		public InsnNode getInsn() {
-			return insn;
-		}
-
-		private List<RegisterArg> getArgs() {
-			return args;
-		}
-
-		public WrapInfo checkInline(int assignPos, RegisterArg arg) {
-			if (assignPos >= inlineBorder || !canMove(assignPos, inlineBorder)) {
-				return null;
-			}
-			inlineBorder = assignPos;
-			return inline(assignPos, arg);
-		}
-
-		private boolean canMove(int from, int to) {
-			ArgsInfo startInfo = argsList.get(from);
-			List<RegisterArg> movedArgs = startInfo.getArgs();
-			int start = from + 1;
-			if (start == to) {
-				// previous instruction or on edge of inline border
-				return true;
-			}
-			if (start > to) {
-				throw new JadxRuntimeException("Invalid inline insn positions: " + start + " - " + to);
-			}
-			BitSet movedSet;
-			if (movedArgs.isEmpty()) {
-				if (startInfo.insn.isConstInsn()) {
-					return true;
-				}
-				movedSet = EmptyBitSet.EMPTY;
-			} else {
-				movedSet = new BitSet();
-				for (RegisterArg arg : movedArgs) {
-					movedSet.set(arg.getRegNum());
-				}
-			}
-			for (int i = start; i < to; i++) {
-				ArgsInfo argsInfo = argsList.get(i);
-				if (argsInfo.getInlinedInsn() == this) {
-					continue;
-				}
-				InsnNode curInsn = argsInfo.insn;
-				if (!curInsn.canReorder() || usedArgAssign(curInsn, movedSet)) {
-					return false;
-				}
-			}
-			return true;
-		}
-
-		private static boolean usedArgAssign(InsnNode insn, BitSet args) {
-			if (args.isEmpty()) {
-				return false;
-			}
-			RegisterArg result = insn.getResult();
-			if (result == null || result.isField()) {
-				return false;
-			}
-			return args.get(result.getRegNum());
-		}
-
-		public WrapInfo inline(int assignInsnPos, RegisterArg arg) {
-			ArgsInfo argsInfo = argsList.get(assignInsnPos);
-			argsInfo.inlinedInsn = this;
-			return new WrapInfo(argsInfo.insn, arg);
-		}
-
-		public ArgsInfo getInlinedInsn() {
-			if (inlinedInsn != null) {
-				ArgsInfo parent = inlinedInsn.getInlinedInsn();
-				if (parent != null) {
-					inlinedInsn = parent;
-				}
-			}
-			return inlinedInsn;
-		}
-
-		@Override
-		public String toString() {
-			return "ArgsInfo: |" + inlineBorder
-					+ " ->" + (inlinedInsn == null ? "-" : inlinedInsn.pos)
-					+ " " + args + " : " + insn;
-		}
-	}
-
-	private static final class WrapInfo {
-		private final InsnNode insn;
-		private final RegisterArg arg;
-
-		public WrapInfo(InsnNode assignInsn, RegisterArg arg) {
-			this.insn = assignInsn;
-			this.arg = arg;
-		}
-
-		private InsnNode getInsn() {
-			return insn;
-		}
-
-		private RegisterArg getArg() {
-			return arg;
-		}
-
-		@Override
-		public String toString() {
-			return "WrapInfo: " + arg + " -> " + insn;
-		}
-	}
-
 	private static void shrinkBlock(MethodNode mth, BlockNode block) {
 		if (block.getInstructions().isEmpty()) {
 			return;

jadx-core/src/main/java/jadx/core/dex/visitors/shrink/WrapInfo.java

@@ -0,0 +1,27 @@
+package jadx.core.dex.visitors.shrink;
+
+import jadx.core.dex.instructions.args.RegisterArg;
+import jadx.core.dex.nodes.InsnNode;
+
+final class WrapInfo {
+	private final InsnNode insn;
+	private final RegisterArg arg;
+
+	WrapInfo(InsnNode assignInsn, RegisterArg arg) {
+		this.insn = assignInsn;
+		this.arg = arg;
+	}
+
+	InsnNode getInsn() {
+		return insn;
+	}
+
+	RegisterArg getArg() {
+		return arg;
+	}
+
+	@Override
+	public String toString() {
+		return "WrapInfo: " + arg + " -> " + insn;
+	}
+}

jadx-core/src/test/java/jadx/tests/functional/JadxVisitorsOrderTest.java

@@ -40,16 +40,19 @@ public class JadxVisitorsOrderTest {
 		List<String> errors = new ArrayList<>();
 
 		Set<String> names = new HashSet<>();
+		Set<Class> passClsSet = new HashSet<>();
 		for (int i = 0; i < passes.size(); i++) {
 			IDexTreeVisitor pass = passes.get(i);
-			JadxVisitor info = pass.getClass().getAnnotation(JadxVisitor.class);
+			Class<? extends IDexTreeVisitor> passClass = pass.getClass();
+			JadxVisitor info = passClass.getAnnotation(JadxVisitor.class);
 			if (info == null) {
-				LOG.warn("No JadxVisitor annotation for visitor: {}", pass.getClass().getName());
+				LOG.warn("No JadxVisitor annotation for visitor: {}", passClass.getName());
 				continue;
 			}
-			String passName = pass.getClass().getSimpleName();
-			if (!names.add(passName)) {
-				errors.add("Visitor name conflict: " + passName + ", class: " + pass.getClass().getName());
+			boolean firstOccurrence = passClsSet.add(passClass);
+			String passName = passClass.getSimpleName();
+			if (firstOccurrence && !names.add(passName)) {
+				errors.add("Visitor name conflict: " + passName + ", class: " + passClass.getName());
 			}
 			for (Class<? extends IDexTreeVisitor> cls : info.runBefore()) {
 				if (classList.indexOf(cls) < i) {