diff --git a/src/me/ByteEdit/edit/Disassembler.java b/src/me/ByteEdit/edit/Disassembler.java
index 681550b..511e3b3 100644
--- a/src/me/ByteEdit/edit/Disassembler.java
+++ b/src/me/ByteEdit/edit/Disassembler.java
@@ -449,6 +449,12 @@ public class Disassembler {
 			tryCatchTable = ctx.finish();
 		} else
 			tryCatchTable = "";
+
+		if (Main.INSTANCE.mntmNumbers.isSelected()) {
+			StackBasedCalculator calc = new StackBasedCalculator(mn.instructions);
+			calc.run();
+		}
+
 		AbstractInsnNode[] insns = mn.instructions.toArray();
 		StringContext ctx = new StringContext(insns.length);
 		for (AbstractInsnNode n : insns) {
diff --git a/src/me/ByteEdit/edit/StackBasedCalculator.java b/src/me/ByteEdit/edit/StackBasedCalculator.java
new file mode 100644
index 0000000..f8b16ed
--- /dev/null
+++ b/src/me/ByteEdit/edit/StackBasedCalculator.java
@@ -0,0 +1,676 @@
+package me.ByteEdit.edit;
+
+import java.util.EmptyStackException;
+import java.util.Stack;
+
+import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.tree.AbstractInsnNode;
+import org.objectweb.asm.tree.InsnList;
+import org.objectweb.asm.tree.InsnNode;
+import org.objectweb.asm.tree.IntInsnNode;
+import org.objectweb.asm.tree.LdcInsnNode;
+
+public class StackBasedCalculator implements Opcodes, Runnable {
+
+	private final InsnList insns;
+	private final Stack<Number> stack = new Stack<>();
+	private AbstractInsnNode start;
+	private int startIdx = -1;
+	private boolean isAtEnd = false;
+
+	public StackBasedCalculator(InsnList insns) {
+		this.insns = insns;
+	}
+
+	@Override
+	public void run() {
+		while (!isAtEnd) {
+			out: {
+				AbstractInsnNode[] arr = insns.toArray();
+				for (int i = startIdx == -1 ? 0 : startIdx; i < arr.length; i++) {
+					if (!handle(arr[i]))
+						break out;
+				}
+				isAtEnd = true;
+			}
+		}
+	}
+
+	private boolean handle(AbstractInsnNode node) {
+		try {
+			switch (node.getOpcode()) {
+			case ICONST_0:
+				stack.push(Integer.valueOf(0));
+				if (start == null)
+					start = node;
+				break;
+			case ICONST_1:
+				stack.push(Integer.valueOf(1));
+				if (start == null)
+					start = node;
+				break;
+			case ICONST_2:
+				stack.push(Integer.valueOf(2));
+				if (start == null)
+					start = node;
+				break;
+			case ICONST_3:
+				stack.push(Integer.valueOf(3));
+				if (start == null)
+					start = node;
+				break;
+			case ICONST_4:
+				stack.push(Integer.valueOf(4));
+				if (start == null)
+					start = node;
+				break;
+			case ICONST_5:
+				stack.push(Integer.valueOf(5));
+				if (start == null)
+					start = node;
+				break;
+			case ICONST_M1:
+				stack.push(Integer.valueOf(-1));
+				if (start == null)
+					start = node;
+				break;
+			case DCONST_0:
+				stack.push(Double.valueOf(0));
+				if (start == null)
+					start = node;
+				break;
+			case DCONST_1:
+				stack.push(Double.valueOf(1));
+				if (start == null)
+					start = node;
+				break;
+			case FCONST_0:
+				stack.push(Float.valueOf(0));
+				if (start == null)
+					start = node;
+				break;
+			case FCONST_1:
+				stack.push(Float.valueOf(1));
+				if (start == null)
+					start = node;
+				break;
+			case FCONST_2:
+				stack.push(Float.valueOf(2));
+				if (start == null)
+					start = node;
+				break;
+			case LCONST_0:
+				stack.push(Long.valueOf(0));
+				if (start == null)
+					start = node;
+				break;
+			case LCONST_1:
+				stack.push(Long.valueOf(1));
+				if (start == null)
+					start = node;
+				break;
+			case BIPUSH:
+			case SIPUSH:
+				stack.push(((IntInsnNode) node).operand);
+				if (start == null)
+					start = node;
+				break;
+			case D2F:
+				stack.push(((Double) stack.pop()).floatValue());
+				change(node);
+				return false;
+			case D2I:
+				stack.push(((Double) stack.pop()).intValue());
+				change(node);
+				return false;
+			case D2L:
+				stack.push(((Double) stack.pop()).longValue());
+				change(node);
+				return false;
+			case F2D:
+				stack.push(((Float) stack.pop()).doubleValue());
+				change(node);
+				return false;
+			case F2I:
+				stack.push(((Float) stack.pop()).intValue());
+				change(node);
+				return false;
+			case F2L:
+				stack.push(((Float) stack.pop()).longValue());
+				change(node);
+				return false;
+			case L2D:
+				stack.push(((Long) stack.pop()).doubleValue());
+				change(node);
+				return false;
+			case L2F:
+				stack.push(((Long) stack.pop()).floatValue());
+				change(node);
+				return false;
+			case L2I:
+				stack.push(((Long) stack.pop()).intValue());
+				change(node);
+				return false;
+			case I2B:
+				error(node);
+				return true;
+			case I2C:
+				error(node);
+				return true;
+			case I2D:
+				stack.push(((Integer) stack.pop()).doubleValue());
+				change(node);
+				return false;
+			case I2F:
+				stack.push(((Integer) stack.pop()).floatValue());
+				change(node);
+				return false;
+			case I2L:
+				stack.push(((Integer) stack.pop()).longValue());
+				change(node);
+				return false;
+			case I2S:
+				error(node);
+				return true;
+			case NOP:
+				break;
+			case LDC:
+				LdcInsnNode ldc = (LdcInsnNode) node;
+				if (ldc.cst instanceof Number) {
+					stack.push((Number) ldc.cst);
+					if (start == null)
+						start = node;
+				} else {
+					error(node);
+					return true;
+				}
+				break;
+			// long
+			case LADD: {
+				long top = ((Long) stack.pop()).longValue();
+				long bottom = ((Long) stack.pop()).longValue();
+				stack.push(bottom + top);
+				change(node);
+				return false;
+			}
+			case LSUB: {
+				long top = ((Long) stack.pop()).longValue();
+				long bottom = ((Long) stack.pop()).longValue();
+				stack.push(bottom - top);
+				change(node);
+				return false;
+			}
+			case LMUL: {
+				long top = ((Long) stack.pop()).longValue();
+				long bottom = ((Long) stack.pop()).longValue();
+				stack.push(bottom * top);
+				change(node);
+				return false;
+			}
+			case LDIV: {
+				long top = ((Long) stack.pop()).longValue();
+				long bottom = ((Long) stack.pop()).longValue();
+				stack.push(bottom / top);
+				change(node);
+				return false;
+			}
+			case LREM: {
+				long top = ((Long) stack.pop()).longValue();
+				long bottom = ((Long) stack.pop()).longValue();
+				stack.push(bottom % top);
+				change(node);
+				return false;
+			}
+			case LNEG: {
+				long top = ((Long) stack.pop()).longValue();
+				stack.push(-top);
+				change(node);
+				return false;
+			}
+			case LAND: {
+				long top = ((Long) stack.pop()).longValue();
+				long bottom = ((Long) stack.pop()).longValue();
+				stack.push(bottom & top);
+				change(node);
+				return false;
+			}
+			case LOR: {
+				long top = ((Long) stack.pop()).longValue();
+				long bottom = ((Long) stack.pop()).longValue();
+				stack.push(bottom | top);
+				change(node);
+				return false;
+			}
+			case LXOR: {
+				long top = ((Long) stack.pop()).longValue();
+				long bottom = ((Long) stack.pop()).longValue();
+				stack.push(bottom ^ top);
+				change(node);
+				return false;
+			}
+			case LSHR: {
+				int top = ((Integer) stack.pop()).intValue();
+				long bottom = ((Long) stack.pop()).longValue();
+				stack.push(bottom >> top);
+				change(node);
+				return false;
+			}
+			case LSHL: {
+				int top = ((Integer) stack.pop()).intValue();
+				long bottom = ((Long) stack.pop()).longValue();
+				stack.push(bottom << top);
+				change(node);
+				return false;
+			}
+			case LUSHR: {
+				int top = ((Integer) stack.pop()).intValue();
+				long bottom = ((Long) stack.pop()).longValue();
+				stack.push(bottom >>> top);
+				change(node);
+				return false;
+			}
+			// int
+			case IADD: {
+				int top = ((Integer) stack.pop()).intValue();
+				int bottom = ((Integer) stack.pop()).intValue();
+				stack.push(bottom + top);
+				change(node);
+				return false;
+			}
+			case ISUB: {
+				int top = ((Integer) stack.pop()).intValue();
+				int bottom = ((Integer) stack.pop()).intValue();
+				stack.push(bottom - top);
+				change(node);
+				return false;
+			}
+			case IMUL: {
+				int top = ((Integer) stack.pop()).intValue();
+				int bottom = ((Integer) stack.pop()).intValue();
+				stack.push(bottom * top);
+				change(node);
+				return false;
+			}
+			case IDIV: {
+				int top = ((Integer) stack.pop()).intValue();
+				int bottom = ((Integer) stack.pop()).intValue();
+				stack.push(bottom / top);
+				change(node);
+				return false;
+			}
+			case IREM: {
+				int top = ((Integer) stack.pop()).intValue();
+				int bottom = ((Integer) stack.pop()).intValue();
+				stack.push(bottom % top);
+				change(node);
+				return false;
+			}
+			case INEG: {
+				int top = ((Integer) stack.pop()).intValue();
+				stack.push(-top);
+				change(node);
+				return false;
+			}
+			case IAND: {
+				int top = ((Integer) stack.pop()).intValue();
+				int bottom = ((Integer) stack.pop()).intValue();
+				stack.push(bottom & top);
+				change(node);
+				return false;
+			}
+			case IOR: {
+				int top = ((Integer) stack.pop()).intValue();
+				int bottom = ((Integer) stack.pop()).intValue();
+				stack.push(bottom | top);
+				change(node);
+				return false;
+			}
+			case IXOR: {
+				int top = ((Integer) stack.pop()).intValue();
+				int bottom = ((Integer) stack.pop()).intValue();
+				stack.push(bottom ^ top);
+				change(node);
+				return false;
+			}
+			case ISHR: {
+				int top = ((Integer) stack.pop()).intValue();
+				int bottom = ((Integer) stack.pop()).intValue();
+				stack.push(bottom >> top);
+				change(node);
+				return false;
+			}
+			case ISHL: {
+				int top = ((Integer) stack.pop()).intValue();
+				int bottom = ((Integer) stack.pop()).intValue();
+				stack.push(bottom << top);
+				change(node);
+				return false;
+			}
+			case IUSHR: {
+				int top = ((Integer) stack.pop()).intValue();
+				int bottom = ((Integer) stack.pop()).intValue();
+				stack.push(bottom >>> top);
+				change(node);
+				return false;
+			}
+			// double
+			case DADD: {
+				double top = ((Double) stack.pop()).doubleValue();
+				double bottom = ((Double) stack.pop()).doubleValue();
+				stack.push(bottom + top);
+				change(node);
+				return false;
+			}
+			case DSUB: {
+				double top = ((Double) stack.pop()).doubleValue();
+				double bottom = ((Double) stack.pop()).doubleValue();
+				stack.push(bottom - top);
+				change(node);
+				return false;
+			}
+			case DMUL: {
+				double top = ((Double) stack.pop()).doubleValue();
+				double bottom = ((Double) stack.pop()).doubleValue();
+				stack.push(bottom * top);
+				change(node);
+				return false;
+			}
+			case DDIV: {
+				double top = ((Double) stack.pop()).doubleValue();
+				double bottom = ((Double) stack.pop()).doubleValue();
+				stack.push(bottom / top);
+				change(node);
+				return false;
+			}
+			case DREM: {
+				double top = ((Double) stack.pop()).doubleValue();
+				double bottom = ((Double) stack.pop()).doubleValue();
+				stack.push(bottom % top);
+				change(node);
+				return false;
+			}
+			case DNEG: {
+				double top = ((Double) stack.pop()).doubleValue();
+				stack.push(-top);
+				change(node);
+				return false;
+			}
+			// float
+			case FADD: {
+				float top = ((Float) stack.pop()).floatValue();
+				float bottom = ((Float) stack.pop()).floatValue();
+				stack.push(bottom + top);
+				change(node);
+				return false;
+			}
+			case FSUB: {
+				float top = ((Float) stack.pop()).floatValue();
+				float bottom = ((Float) stack.pop()).floatValue();
+				stack.push(bottom - top);
+				change(node);
+				return false;
+			}
+			case FMUL: {
+				float top = ((Float) stack.pop()).floatValue();
+				float bottom = ((Float) stack.pop()).floatValue();
+				stack.push(bottom * top);
+				change(node);
+				return false;
+			}
+			case FDIV: {
+				float top = ((Float) stack.pop()).floatValue();
+				float bottom = ((Float) stack.pop()).floatValue();
+				stack.push(bottom / top);
+				change(node);
+				return false;
+			}
+			case FREM: {
+				float top = ((Float) stack.pop()).floatValue();
+				float bottom = ((Float) stack.pop()).floatValue();
+				stack.push(bottom % top);
+				change(node);
+				return false;
+			}
+			case FNEG: {
+				float top = ((Float) stack.pop()).floatValue();
+				stack.push(-top);
+				change(node);
+				return false;
+			}
+			// dup
+			case DUP: {
+				Number num = stack.pop();
+				if (num instanceof Double || num instanceof Long) {
+					error(node);
+					return true;
+				}
+				stack.push(num);
+				stack.push(num);
+				change(node);
+				return false;
+			}
+			case DUP_X1: {
+				Number top = stack.pop();
+				Number bottom = stack.pop();
+				if (bottom instanceof Double || bottom instanceof Long || top instanceof Double
+						|| top instanceof Long) {
+					error(node);
+					return true;
+				}
+				stack.push(top);
+				stack.push(bottom);
+				stack.push(top);
+				change(node);
+				return false;
+			}
+			case DUP_X2: {
+				Number top = stack.pop();
+				Number bottom = stack.pop();
+				if (top instanceof Double || top instanceof Long) {
+					error(node);
+					return true;
+				}
+				Number bottom2 = null;
+				if (!(bottom instanceof Double || bottom instanceof Long)) {
+					bottom2 = stack.pop();
+					if (bottom instanceof Double || bottom instanceof Long) {
+						error(node);
+						return true;
+					}
+				}
+				stack.push(top);
+				if (bottom2 != null)
+					stack.push(bottom2);
+				stack.push(bottom);
+				stack.push(top);
+				change(node);
+				return false;
+			}
+			case DUP2: {
+				Number top = stack.pop();
+				Number bottom = null;
+				if (!(top instanceof Double || top instanceof Long)) {
+					bottom = stack.pop();
+					if (bottom instanceof Double || bottom instanceof Long) {
+						error(node);
+						return true;
+					}
+				}
+				if (bottom != null)
+					stack.push(bottom);
+				stack.push(top);
+				if (bottom != null)
+					stack.push(bottom);
+				stack.push(top);
+				change(node);
+				return false;
+			}
+			case DUP2_X1: {
+				Number top = stack.pop();
+				Number bottom = null;
+				if (!(top instanceof Double || top instanceof Long)) {
+					bottom = stack.pop();
+					if (bottom instanceof Double || bottom instanceof Long) {
+						error(node);
+						return true;
+					}
+				}
+				Number bottom2 = stack.pop();
+				if (bottom != null)
+					stack.push(bottom);
+				stack.push(top);
+				stack.push(bottom2);
+				if (bottom != null)
+					stack.push(bottom);
+				stack.push(top);
+				change(node);
+				return false;
+			}
+			case DUP2_X2: {
+				Number top = stack.pop();
+				Number bottom = null;
+				if (!(top instanceof Double || top instanceof Long)) {
+					bottom = stack.pop();
+					if (bottom instanceof Double || bottom instanceof Long) {
+						error(node);
+						return true;
+					}
+				}
+				Number top2 = stack.pop();
+				Number bottom2 = null;
+				if (!(top2 instanceof Double || top2 instanceof Long)) {
+					bottom2 = stack.pop();
+					if (bottom2 instanceof Double || bottom2 instanceof Long) {
+						error(node);
+						return true;
+					}
+				}
+				if (bottom != null)
+					stack.push(bottom);
+				stack.push(top);
+				if (bottom2 != null)
+					stack.push(bottom2);
+				stack.push(top2);
+				if (bottom != null)
+					stack.push(bottom);
+				stack.push(top);
+				change(node);
+				return false;
+			}
+			// stack
+			case POP:
+				stack.pop();
+				change(node);
+				return false;
+			case POP2:
+				stack.pop();
+				stack.pop();
+				change(node);
+				return false;
+			case SWAP: {
+				Number top = stack.pop();
+				Number bottom = stack.pop();
+				if (bottom instanceof Double || bottom instanceof Long || top instanceof Double
+						|| top instanceof Long) {
+					error(node);
+					return true;
+				}
+				stack.push(top);
+				stack.push(bottom);
+				change(node);
+				return false;
+			}
+			default:
+				error(node);
+				return true;
+			}
+		} catch (ClassCastException | EmptyStackException ex) {
+			error(node);
+			return true;
+		}
+		return true;
+	}
+
+	private void error(AbstractInsnNode node) {
+		change(node.getPrevious());
+		stack.clear();
+		start = null;
+	}
+
+	private void change(AbstractInsnNode node) {
+		if (start == null)
+			return;
+		int idx = insns.indexOf(start);
+		startIdx = idx;
+		int idx2 = insns.indexOf(node);
+		if (idx != idx2) {
+			for (int i = 0; i <= idx2 - idx; i++) {
+				insns.remove(insns.get(idx));
+			}
+			while (!stack.isEmpty()) {
+				addNode(idx, stack.pop());
+			}
+		}
+		stack.clear();
+		start = null;
+	}
+
+	private void addNode(int idx, Number n) {
+		if (n instanceof Double) {
+			double val = n.doubleValue();
+			if (val == 0.0)
+				insns.insertBefore(insns.get(idx), new InsnNode(DCONST_0));
+			else if (val == 1.0)
+				insns.insertBefore(insns.get(idx), new InsnNode(DCONST_1));
+			else
+				insns.insertBefore(insns.get(idx), new LdcInsnNode(val));
+		} else if (n instanceof Float) {
+			float val = n.floatValue();
+			if (val == 0.0f)
+				insns.insertBefore(insns.get(idx), new InsnNode(FCONST_0));
+			else if (val == 1.0f)
+				insns.insertBefore(insns.get(idx), new InsnNode(FCONST_1));
+			else if (val == 2.0f)
+				insns.insertBefore(insns.get(idx), new InsnNode(FCONST_2));
+			else
+				insns.insertBefore(insns.get(idx), new LdcInsnNode(val));
+		} else if (n instanceof Long) {
+			long val = n.longValue();
+			if (val == 0l)
+				insns.insertBefore(insns.get(idx), new InsnNode(LCONST_0));
+			else if (val == 1l)
+				insns.insertBefore(insns.get(idx), new InsnNode(LCONST_1));
+			else
+				insns.insertBefore(insns.get(idx), new LdcInsnNode(val));
+		} else if (n instanceof Integer) {
+			int val = n.intValue();
+			if (val == 0)
+				insns.insertBefore(insns.get(idx), new InsnNode(ICONST_0));
+			else if (val == 1)
+				insns.insertBefore(insns.get(idx), new InsnNode(ICONST_1));
+			else if (val == 2)
+				insns.insertBefore(insns.get(idx), new InsnNode(ICONST_2));
+			else if (val == 3)
+				insns.insertBefore(insns.get(idx), new InsnNode(ICONST_3));
+			else if (val == 4)
+				insns.insertBefore(insns.get(idx), new InsnNode(ICONST_4));
+			else if (val == 5)
+				insns.insertBefore(insns.get(idx), new InsnNode(ICONST_5));
+			else if (val == -1)
+				insns.insertBefore(insns.get(idx), new InsnNode(ICONST_M1));
+			else
+				insns.insertBefore(insns.get(idx), new LdcInsnNode(val));
+		} else if (n instanceof Long) {
+			long val = n.longValue();
+			if (val == 0l)
+				insns.insertBefore(insns.get(idx), new InsnNode(LCONST_0));
+			else if (val == 1l)
+				insns.insertBefore(insns.get(idx), new InsnNode(LCONST_1));
+			else
+				insns.insertBefore(insns.get(idx), new LdcInsnNode(val));
+		} else {
+			throw new RuntimeException("Unexpected number: " + n);
+		}
+	}
+
+}
diff --git a/src/me/ByteEdit/main/Main.java b/src/me/ByteEdit/main/Main.java
index 172fbfb..35d3d0f 100644
--- a/src/me/ByteEdit/main/Main.java
+++ b/src/me/ByteEdit/main/Main.java
@@ -148,6 +148,8 @@ public class Main extends JFrame {
 	private JMenuItem rdbtnmntm5000;
 	private JMenuItem rdbtnmntm10000;
 	public JCheckBoxMenuItem mntmMultithreaded;
+	private JMenu mnDeobfuscation;
+	public JCheckBoxMenuItem mntmNumbers;
 
 	public static final Object treeLock = new Object();
 
@@ -415,6 +417,12 @@ public class Main extends JFrame {
 		group.add(rdbtnmntm1000);
 		group.add(rdbtnmntm5000);
 		group.add(rdbtnmntm10000);
+		
+		mnDeobfuscation = new JMenu("Deobfuscation");
+		menuBar.add(mnDeobfuscation);
+		
+		mntmNumbers = new JCheckBoxMenuItem("Numbers");
+		mnDeobfuscation.add(mntmNumbers);
 
 		contentPane = new JPanel();
 		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));