more arith deob

src/main/java/info/sigterm/deob/deobfuscators/UnusedFields.java

@@ -0,0 +1,59 @@
+package info.sigterm.deob.deobfuscators;
+
+import java.util.ArrayList;
+
+import info.sigterm.deob.ClassFile;
+import info.sigterm.deob.ClassGroup;
+import info.sigterm.deob.Field;
+import info.sigterm.deob.Method;
+import info.sigterm.deob.attributes.Code;
+import info.sigterm.deob.attributes.code.Instruction;
+import info.sigterm.deob.attributes.code.instruction.types.FieldInstruction;
+
+public class UnusedFields
+{
+	private static boolean isUnused(ClassGroup group, Field field)
+	{
+		for (ClassFile cf : group.getClasses())
+			for (Method m : cf.getMethods().getMethods())
+			{
+				Code code = m.getCode();
+				if (code == null)
+					continue;
+				
+				for (Instruction ins : code.getInstructions().getInstructions())
+				{
+					if (ins instanceof FieldInstruction)
+					{
+						FieldInstruction fi = (FieldInstruction) ins;
+						
+						info.sigterm.deob.pool.Field ff = fi.getField();
+						
+						if (ff.getClassEntry().getName().equals(field.getFields().getClassFile().getName()))
+						{
+							if (ff.getNameAndType().getName().equals(field.getName()))
+							{
+								return false;
+							}
+						}
+					}
+				}
+			}
+		return true;
+	}
+	
+	public void run(ClassGroup group)
+	{
+		int count = 0;
+		for (ClassFile cf : group.getClasses())
+			for (Field f : new ArrayList<>(cf.getFields().getFields()))
+			{
+				if (isUnused(group, f))
+				{
+					cf.getFields().getFields().remove(f);
+					++count;
+				}
+			}
+		System.out.println("Removed " + count + " unused fields");
+	}
+}