Some branching/jumping

src/main/java/info/sigterm/deob/ClassFile.java

@@ -117,4 +117,9 @@ public class ClassFile
 	{
 		methods.buildInstructionGraph();
 	}
+	
+	public boolean instanceOf(ClassFile other)
+	{
+		return this == other || interfaces.instanceOf(other) || (getParent() != null && getParent().instanceOf(other));
+	}
 }

src/main/java/info/sigterm/deob/Interfaces.java

@@ -1,5 +1,7 @@
 package info.sigterm.deob;
 
+import info.sigterm.deob.pool.Class;
+
 import java.io.DataInputStream;
 import java.io.IOException;
 
@@ -22,4 +24,16 @@ public class Interfaces
 		for (int i = 0; i < count; ++i)
 			interfaces[i] = is.readUnsignedShort();
 	}
+	
+	public boolean instanceOf(ClassFile cf)
+	{
+		for (int i : interfaces)
+		{
+			Class clazz = (Class) classFile.getPool().getEntry(i);
+			ClassFile iface = classFile.getGroup().findClass(clazz.getName());
+			if (iface.instanceOf(cf))
+				return true;
+		}
+		return false;
+	}
 }

src/main/java/info/sigterm/deob/attributes/Code.java

@@ -1,9 +1,7 @@
 package info.sigterm.deob.attributes;
 
 import info.sigterm.deob.attributes.code.Exceptions;
-import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.Instructions;
-import info.sigterm.deob.execution.Frame;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -40,15 +38,30 @@ public class Code extends Attribute
 	{
 		return maxLocals;
 	}
+	
+	public Instructions getInstructions()
+	{
+		return instructions;
+	}
 
 	public void buildInstructionGraph()
 	{
 		instructions.buildInstructionGraph();
 	}
 
+	/*
 	public void execute(Frame frame)
 	{
-		Instruction i = instructions.getFirstInstruction();
-		i.execute(frame);
+		int pc = 0;
+		
+		while (exeuting)
+		{
+			Instruction i = instructions.findInstruction(pc);
+			i.execute(frame);
+		}
 	}
+	
+	public void jump(int offset)
+	{
+	}*/
 }

src/main/java/info/sigterm/deob/attributes/code/Instruction.java

@@ -55,6 +55,5 @@ public abstract class Instruction
 	{
 	}
 
-	//public abstract void execute(Frame e);
-	public void execute(Frame e) { }
+	public abstract void execute(Frame e);
 }

src/main/java/info/sigterm/deob/attributes/code/InstructionType.java

@@ -157,23 +157,21 @@ public enum InstructionType
 	FCMPG(0x96, "fcmpg", FCmpG.class),
 	DCMPL(0x97, "dcmpl", DCmpL.class),
 	DCMPG(0x98, "dcmpg", DCmpG.class),
-	IFEQ(0x99, "ifeq", Branch.class),
-	IFNE(0x9a, "ifne", Branch.class),
-	IFLT(0x9b, "iflt", Branch.class),
-	IFGE(0x9c, "ifge", Branch.class),
-	IFGT(0x9d, "ifgt", Branch.class),
-	IFLE(0x9e, "ifle", Branch.class),
-	IF_ICMPEQ(0x9f, "if_icmpeq", Branch.class),
-	IF_ICMPNE(0xa0, "if_icmpne", Branch.class),
-	IF_ICMPLT(0xa1, "if_cmplt", Branch.class),
-	IF_CMPGE(0xa2, "if_cmpge", Branch.class),
-	IF_CMPGT(0xa3, "if_cmpgt", Branch.class),
-	IF_CMPLE(0xa4, "if_cmple", Branch.class),
-	IF_ACMPEQ(0xa5, "if_acmpeq", Branch.class),
-	IF_ACMPNE(0xa6, "if_acmpne", Branch.class),
-	GOTO(0xa7, "goto", Branch.class),
-	JSR(0xa8, "jsr", Branch.class),
-	RET(0xa9, "ret", Ret.class),
+	IFEQ(0x99, "ifeq", If0.class),
+	IFNE(0x9a, "ifne", If0.class),
+	IFLT(0x9b, "iflt", If0.class),
+	IFGE(0x9c, "ifge", If0.class),
+	IFGT(0x9d, "ifgt", If0.class),
+	IFLE(0x9e, "ifle", If0.class),
+	IF_ICMPEQ(0x9f, "if_icmpeq", If.class),
+	IF_ICMPNE(0xa0, "if_icmpne", If.class),
+	IF_ICMPLT(0xa1, "if_cmplt", If.class),
+	IF_CMPGE(0xa2, "if_cmpge", If.class),
+	IF_CMPGT(0xa3, "if_cmpgt", If.class),
+	IF_CMPLE(0xa4, "if_cmple", If.class),
+	IF_ACMPEQ(0xa5, "if_acmpeq", If.class),
+	IF_ACMPNE(0xa6, "if_acmpne", If.class),
+	GOTO(0xa7, "goto", Goto.class),
 	TABLESWITCH(0xaa, "tableswitch", TableSwitch.class),
 	LOOKUPSWITCH(0xab, "lookupswitch", LookupSwitch.class),
 	IRETURN(0xac, "ireturn", Instruction.class),
@@ -198,14 +196,13 @@ public enum InstructionType
 	ATHROW(0xbf, "athrow", Instruction.class),
 	CHECKCAST(0xc0, "checkcast", CheckCast.class),
 	INSTANCEOf(0xc1, "instanceof", InstanceOf.class),
-	MONITORENTER(0xc2, "monitorenter", Instruction.class),
-	MONITOREXIT(0xc3, "monitorexit", Instruction.class),
+	MONITORENTER(0xc2, "monitorenter", MonitorEnter.class),
+	MONITOREXIT(0xc3, "monitorexit", MonitorExit.class),
 	WIDE(0xc4, "wide", Wide.class),
 	MULTIANEWARRAY(0xc5, "multianewarray", MultiANewArray.class),
-	IFNULL(0xc6, "ifnull", IfNull.class),
-	IFNONNULL(0xc7, "ifnonnull", IfNonNull.class),
-	GOTO_W(0xc8, "goto_w", GotoW.class),
-	JSR_W(0xc9, "jsr_w", JSR_W.class);
+	IFNULL(0xc6, "ifnull", If0.class),
+	IFNONNULL(0xc7, "ifnonnull", If0.class),
+	GOTO_W(0xc8, "goto_w", GotoW.class);
 
 	private byte code;
 	private String name;

src/main/java/info/sigterm/deob/attributes/code/Instructions.java

@@ -63,12 +63,7 @@ public class Instructions
 	{
 		return code;
 	}
-
-	public Instruction getFirstInstruction()
-	{
-		return instructions.get(0);
-	}
-
+	
 	public Instruction findInstruction(int pc)
 	{
 		for (Instruction i : instructions)

src/main/java/info/sigterm/deob/attributes/code/instructions/AALoad.java

@@ -3,6 +3,7 @@ package info.sigterm.deob.attributes.code.instructions;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.ArrayInstance;
 import info.sigterm.deob.execution.Frame;
 import info.sigterm.deob.execution.Stack;
 
@@ -19,8 +20,8 @@ public class AALoad extends Instruction
 		Stack stack = frame.getStack();
 		
 		int index = (int) stack.pop();
-		Object[] array = (Object[]) stack.pop();
+		ArrayInstance array = (ArrayInstance) stack.pop();
 		
-		stack.push(array[index]);
+		stack.push(array.get(index));
 	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/AAStore.java

@@ -3,7 +3,9 @@ package info.sigterm.deob.attributes.code.instructions;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.ArrayInstance;
 import info.sigterm.deob.execution.Frame;
+import info.sigterm.deob.execution.ObjectInstance;
 import info.sigterm.deob.execution.Stack;
 
 public class AAStore extends Instruction
@@ -18,10 +20,10 @@ public class AAStore extends Instruction
 	{
 		Stack stack = frame.getStack();
 		
-		Object value = stack.pop();
+		ObjectInstance value = (ObjectInstance) stack.pop();
 		int index = (int) stack.pop();
-		Object[] array = (Object[]) stack.pop();
+		ArrayInstance array = (ArrayInstance) stack.pop();
 		
-		array[index] = value;
+		array.put(value, index);
 	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/ALoad.java

@@ -3,6 +3,7 @@ package info.sigterm.deob.attributes.code.instructions;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -20,4 +21,10 @@ public class ALoad extends Instruction
 		length += 1;
 	}
 
+	@Override
+	public void execute(Frame frame)
+	{
+		Object obj = frame.getVariables().get(index);
+		frame.getStack().push(obj);
+	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/ANewArray.java

@@ -1,8 +1,13 @@
 package info.sigterm.deob.attributes.code.instructions;
 
+import info.sigterm.deob.ClassFile;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.ArrayInstance;
+import info.sigterm.deob.execution.ClassInstance;
+import info.sigterm.deob.execution.Frame;
+import info.sigterm.deob.pool.Class;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -20,4 +25,24 @@ public class ANewArray extends Instruction
 		length += 2;
 	}
 
+	@Override
+	public void execute(Frame frame)
+	{
+		ClassFile thisClass = this.getInstructions().getCode().getAttributes().getClassFile();
+		Class clazz = (Class) thisClass.getPool().getEntry(index);
+		
+		int count = (int) frame.getStack().pop();
+		
+		ClassFile cf = thisClass.getGroup().findClass(clazz.getName());
+		if (cf == null)
+		{
+			frame.getStack().push(null);
+			return;
+		}
+		
+		ClassInstance type = frame.getPath().getClassInstance(cf);
+		ArrayInstance array = frame.getPath().createArray(type, count);
+		
+		frame.getStack().push(array);
+	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/BiPush.java

@@ -3,6 +3,7 @@ package info.sigterm.deob.attributes.code.instructions;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -20,4 +21,9 @@ public class BiPush extends Instruction
 		length += 1;
 	}
 
+	@Override
+	public void execute(Frame frame)
+	{
+		frame.getStack().push((int) b);
+	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/CheckCast.java

@@ -1,8 +1,13 @@
 package info.sigterm.deob.attributes.code.instructions;
 
+import info.sigterm.deob.ClassFile;
+import info.sigterm.deob.ConstantPool;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
+import info.sigterm.deob.execution.ObjectInstance;
+import info.sigterm.deob.pool.Class;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -20,4 +25,30 @@ public class CheckCast extends Instruction
 		length += 2;
 	}
 
+	@Override
+	public void execute(Frame e)
+	{
+		ClassFile thisClass = this.getInstructions().getCode().getAttributes().getClassFile();
+
+		ConstantPool pool = thisClass.getPool();
+		Class clazz = (Class) pool.getEntry(index);
+		
+		ObjectInstance obj = (ObjectInstance) e.getStack().pop();
+		if (obj == null)
+		{
+			e.getStack().push(null);
+			return;
+		}
+		
+		ClassFile otherClass = thisClass.getGroup().findClass(clazz.getName());
+		boolean instanceOf = obj.getType().getClassFile().instanceOf(otherClass);
+		
+		if (!instanceOf)
+		{
+			// XXX throw
+		}
+		
+		e.getStack().push(obj);
+	}
+
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/DLoad.java

@@ -3,6 +3,7 @@ package info.sigterm.deob.attributes.code.instructions;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -20,4 +21,10 @@ public class DLoad extends Instruction
 		length += 1;
 	}
 
+	@Override
+	public void execute(Frame frame)
+	{
+		double d = (double) frame.getVariables().get(index);
+		frame.getStack().push(d);
+	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/DStore.java

@@ -3,6 +3,7 @@ package info.sigterm.deob.attributes.code.instructions;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -20,4 +21,10 @@ public class DStore extends Instruction
 		length += 1;
 	}
 
+	@Override
+	public void execute(Frame frame)
+	{
+		double d = (double) frame.getStack().pop();
+		frame.getVariables().set(index, d);
+	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/FLoad.java

@@ -3,6 +3,7 @@ package info.sigterm.deob.attributes.code.instructions;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -20,4 +21,10 @@ public class FLoad extends Instruction
 		length += 1;
 	}
 
+	@Override
+	public void execute(Frame frame)
+	{
+		float f = (float) frame.getVariables().get(index);
+		frame.getStack().push(f);
+	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/FStore.java

@@ -3,6 +3,7 @@ package info.sigterm.deob.attributes.code.instructions;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -20,4 +21,10 @@ public class FStore extends Instruction
 		length += 1;
 	}
 
+	@Override
+	public void execute(Frame frame)
+	{
+		float f = (float) frame.getStack().pop();
+		frame.getVariables().set(index, f);
+	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/GetField.java

@@ -1,8 +1,15 @@
 package info.sigterm.deob.attributes.code.instructions;
 
+import info.sigterm.deob.ClassFile;
+import info.sigterm.deob.ConstantPool;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.FieldInstance;
+import info.sigterm.deob.execution.Frame;
+import info.sigterm.deob.execution.ObjectInstance;
+import info.sigterm.deob.pool.Field;
+import info.sigterm.deob.pool.NameAndType;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -20,4 +27,19 @@ public class GetField extends Instruction
 		length += 2;
 	}
 
+	@Override
+	public void execute(Frame frame)
+	{
+		ObjectInstance object = (ObjectInstance) frame.getStack().pop();
+		
+		ClassFile thisClass = this.getInstructions().getCode().getAttributes().getClassFile();
+
+		ConstantPool pool = thisClass.getPool();
+		Field entry = (Field) pool.getEntry(index);
+
+		NameAndType nat = entry.getNameAndType();
+		
+		FieldInstance field = object.getField(nat);
+		frame.getStack().push(field.getValue());
+	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/Goto.java

@@ -3,15 +3,16 @@ package info.sigterm.deob.attributes.code.instructions;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
 
 import java.io.DataInputStream;
 import java.io.IOException;
 
-public class Branch extends Instruction
+public class Goto extends Instruction
 {
 	private short offset;
 
-	public Branch(Instructions instructions, InstructionType type, int pc) throws IOException
+	public Goto(Instructions instructions, InstructionType type, int pc) throws IOException
 	{
 		super(instructions, type, pc);
 
@@ -25,4 +26,10 @@ public class Branch extends Instruction
 	{
 		this.addJump(offset);
 	}
+	
+	@Override
+	public void execute(Frame e)
+	{
+		e.jump(offset);
+	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/GotoW.java

@@ -3,6 +3,7 @@ package info.sigterm.deob.attributes.code.instructions;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -25,4 +26,10 @@ public class GotoW extends Instruction
 	{
 		this.addJump(offset);
 	}
+	
+	@Override
+	public void execute(Frame e)
+	{
+		e.jump(offset);
+	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/IInc.java

@@ -3,6 +3,7 @@ package info.sigterm.deob.attributes.code.instructions;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -22,4 +23,11 @@ public class IInc extends Instruction
 		length += 2;
 	}
 
+	@Override
+	public void execute(Frame frame)
+	{
+		int i = (int) frame.getVariables().get(index);
+		i += inc;
+		frame.getVariables().set(index, i);
+	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/ILoad.java

@@ -3,6 +3,7 @@ package info.sigterm.deob.attributes.code.instructions;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -20,4 +21,10 @@ public class ILoad extends Instruction
 		length += 1;
 	}
 
+	@Override
+	public void execute(Frame frame)
+	{
+		int i = (int) frame.getVariables().get(index);
+		frame.getStack().push(i);
+	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/If.java

@@ -0,0 +1,41 @@
+package info.sigterm.deob.attributes.code.instructions;
+
+import info.sigterm.deob.attributes.code.Instruction;
+import info.sigterm.deob.attributes.code.InstructionType;
+import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
+import info.sigterm.deob.execution.Path;
+
+import java.io.DataInputStream;
+import java.io.IOException;
+
+public class If extends Instruction
+{
+	private short offset;
+
+	public If(Instructions instructions, InstructionType type, int pc) throws IOException
+	{
+		super(instructions, type, pc);
+
+		DataInputStream is = instructions.getCode().getAttributes().getStream();
+		offset = is.readShort();
+		length += 2;
+	}
+
+	@Override
+	public void buildJumpGraph()
+	{
+		this.addJump(offset);
+	}
+	
+	@Override
+	public void execute(Frame e)
+	{
+		e.getStack().pop();
+		e.getStack().pop();
+		
+		Path other = e.getPath().dup();
+		Frame frame = other.getCurrentFrame();
+		frame.jump(offset);
+	}
+}

src/main/java/info/sigterm/deob/attributes/code/instructions/If0.java

@@ -3,21 +3,23 @@ package info.sigterm.deob.attributes.code.instructions;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
+import info.sigterm.deob.execution.Path;
 
 import java.io.DataInputStream;
 import java.io.IOException;
 
-public class JSR_W extends Instruction
+public class If0 extends Instruction
 {
-	private int offset;
+	private short offset;
 
-	public JSR_W(Instructions instructions, InstructionType type, int pc) throws IOException
+	public If0(Instructions instructions, InstructionType type, int pc) throws IOException
 	{
 		super(instructions, type, pc);
 
 		DataInputStream is = instructions.getCode().getAttributes().getStream();
-		offset = is.readInt();
-		length += 4;
+		offset = is.readShort();
+		length += 2;
 	}
 
 	@Override
@@ -25,4 +27,14 @@ public class JSR_W extends Instruction
 	{
 		this.addJump(offset);
 	}
+
+	@Override
+	public void execute(Frame e)
+	{
+		e.getStack().pop();
+		
+		Path other = e.getPath().dup();
+		Frame frame = other.getCurrentFrame();
+		frame.jump(offset);
+	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/IfNonNull.java

@@ -1,23 +0,0 @@
-package info.sigterm.deob.attributes.code.instructions;
-
-import info.sigterm.deob.attributes.code.Instruction;
-import info.sigterm.deob.attributes.code.InstructionType;
-import info.sigterm.deob.attributes.code.Instructions;
-
-import java.io.DataInputStream;
-import java.io.IOException;
-
-public class IfNonNull extends Instruction
-{
-	private int index;
-
-	public IfNonNull(Instructions instructions, InstructionType type, int pc) throws IOException
-	{
-		super(instructions, type, pc);
-
-		DataInputStream is = instructions.getCode().getAttributes().getStream();
-		index = is.readUnsignedShort();
-		length += 2;
-	}
-
-}

src/main/java/info/sigterm/deob/attributes/code/instructions/IfNull.java

@@ -1,23 +0,0 @@
-package info.sigterm.deob.attributes.code.instructions;
-
-import info.sigterm.deob.attributes.code.Instruction;
-import info.sigterm.deob.attributes.code.InstructionType;
-import info.sigterm.deob.attributes.code.Instructions;
-
-import java.io.DataInputStream;
-import java.io.IOException;
-
-public class IfNull extends Instruction
-{
-	private int index;
-
-	public IfNull(Instructions instructions, InstructionType type, int pc) throws IOException
-	{
-		super(instructions, type, pc);
-
-		DataInputStream is = instructions.getCode().getAttributes().getStream();
-		index = is.readUnsignedShort();
-		length += 2;
-	}
-
-}

src/main/java/info/sigterm/deob/attributes/code/instructions/InstanceOf.java

@@ -1,8 +1,13 @@
 package info.sigterm.deob.attributes.code.instructions;
 
+import info.sigterm.deob.ClassFile;
+import info.sigterm.deob.ConstantPool;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
+import info.sigterm.deob.execution.ObjectInstanceBase;
+import info.sigterm.deob.pool.Class;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -20,4 +25,24 @@ public class InstanceOf extends Instruction
 		length += 2;
 	}
 
+	@Override
+	public void execute(Frame e)
+	{
+		ClassFile thisClass = this.getInstructions().getCode().getAttributes().getClassFile();
+
+		ConstantPool pool = thisClass.getPool();
+		Class clazz = (Class) pool.getEntry(index);
+		
+		ObjectInstanceBase obj = (ObjectInstanceBase) e.getStack().pop();
+		if (obj == null)
+		{
+			e.getStack().push(0);
+			return;
+			
+		}
+		
+		ClassFile otherClass = thisClass.getGroup().findClass(clazz.getName());
+		boolean instanceOf = obj.getType().getClassFile().instanceOf(otherClass);
+		e.getStack().push(instanceOf ? 1 : 0);
+	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/LDC.java

@@ -1,8 +1,11 @@
 package info.sigterm.deob.attributes.code.instructions;
 
+import info.sigterm.deob.ClassFile;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
+import info.sigterm.deob.pool.PoolEntry;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -20,4 +23,11 @@ public class LDC extends Instruction
 		length += 1;
 	}
 
+	@Override
+	public void execute(Frame frame)
+	{
+		ClassFile thisClass = this.getInstructions().getCode().getAttributes().getClassFile();
+		PoolEntry entry = thisClass.getPool().getEntry(index);
+		frame.getStack().push(entry.getObject());
+	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/LDC2_W.java

@@ -1,8 +1,11 @@
 package info.sigterm.deob.attributes.code.instructions;
 
+import info.sigterm.deob.ClassFile;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
+import info.sigterm.deob.pool.PoolEntry;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -20,4 +23,11 @@ public class LDC2_W extends Instruction
 		length += 2;
 	}
 
+	@Override
+	public void execute(Frame frame)
+	{
+		ClassFile thisClass = this.getInstructions().getCode().getAttributes().getClassFile();
+		PoolEntry entry = thisClass.getPool().getEntry(index);
+		frame.getStack().push(entry.getObject());
+	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/LDC_W.java

@@ -1,8 +1,11 @@
 package info.sigterm.deob.attributes.code.instructions;
 
+import info.sigterm.deob.ClassFile;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
+import info.sigterm.deob.pool.PoolEntry;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -20,4 +23,11 @@ public class LDC_W extends Instruction
 		length += 2;
 	}
 
+	@Override
+	public void execute(Frame frame)
+	{
+		ClassFile thisClass = this.getInstructions().getCode().getAttributes().getClassFile();
+		PoolEntry entry = thisClass.getPool().getEntry(index);
+		frame.getStack().push(entry.getObject());
+	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/LLoad.java

@@ -3,6 +3,7 @@ package info.sigterm.deob.attributes.code.instructions;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -20,4 +21,10 @@ public class LLoad extends Instruction
 		length += 1;
 	}
 
+	@Override
+	public void execute(Frame frame)
+	{
+		long l = (long) frame.getVariables().get(index);
+		frame.getStack().push(l);
+	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/LStore.java

@@ -3,6 +3,7 @@ package info.sigterm.deob.attributes.code.instructions;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -20,4 +21,10 @@ public class LStore extends Instruction
 		length += 1;
 	}
 
+	@Override
+	public void execute(Frame frame)
+	{
+		long l = (long) frame.getStack().pop();
+		frame.getVariables().set(index, l);
+	}
 }

src/main/java/info/sigterm/deob/attributes/code/instructions/MonitorEnter.java

@@ -0,0 +1,19 @@
+package info.sigterm.deob.attributes.code.instructions;
+
+import info.sigterm.deob.attributes.code.Instruction;
+import info.sigterm.deob.attributes.code.InstructionType;
+import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
+
+public class MonitorEnter extends Instruction
+{
+	public MonitorEnter(Instructions instructions, InstructionType type, int pc)
+	{
+		super(instructions, type, pc);
+	}
+
+	@Override
+	public void execute(Frame frame)
+	{
+	}
+}

src/main/java/info/sigterm/deob/attributes/code/instructions/MonitorExit.java

@@ -0,0 +1,19 @@
+package info.sigterm.deob.attributes.code.instructions;
+
+import info.sigterm.deob.attributes.code.Instruction;
+import info.sigterm.deob.attributes.code.InstructionType;
+import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
+
+public class MonitorExit extends Instruction
+{
+	public MonitorExit(Instructions instructions, InstructionType type, int pc)
+	{
+		super(instructions, type, pc);
+	}
+
+	@Override
+	public void execute(Frame frame)
+	{
+	}
+}

src/main/java/info/sigterm/deob/attributes/code/instructions/Ret.java

@@ -1,23 +0,0 @@
-package info.sigterm.deob.attributes.code.instructions;
-
-import info.sigterm.deob.attributes.code.Instruction;
-import info.sigterm.deob.attributes.code.InstructionType;
-import info.sigterm.deob.attributes.code.Instructions;
-
-import java.io.DataInputStream;
-import java.io.IOException;
-
-public class Ret extends Instruction
-{
-	private int index;
-
-	public Ret(Instructions instructions, InstructionType type, int pc) throws IOException
-	{
-		super(instructions, type, pc);
-
-		DataInputStream is = instructions.getCode().getAttributes().getStream();
-		index = is.readByte();
-		length += 1;
-	}
-
-}

src/main/java/info/sigterm/deob/attributes/code/instructions/SiPush.java

@@ -3,6 +3,7 @@ package info.sigterm.deob.attributes.code.instructions;
 import info.sigterm.deob.attributes.code.Instruction;
 import info.sigterm.deob.attributes.code.InstructionType;
 import info.sigterm.deob.attributes.code.Instructions;
+import info.sigterm.deob.execution.Frame;
 
 import java.io.DataInputStream;
 import java.io.IOException;
@@ -20,4 +21,9 @@ public class SiPush extends Instruction
 		length += 2;
 	}
 
+	@Override
+	public void execute(Frame frame)
+	{
+		frame.getStack().push(s);
+	}
 }

src/main/java/info/sigterm/deob/execution/ArrayInstance.java

@@ -0,0 +1,23 @@
+package info.sigterm.deob.execution;
+
+
+public class ArrayInstance extends ObjectInstanceBase
+{
+	private ObjectInstance[] array;
+	
+	public ArrayInstance(Path path, ClassInstance type, int len)
+	{
+		super(path, type);
+		this.array = new ObjectInstance[len];
+	}
+	
+	public void put(ObjectInstance obj, int idx)
+	{
+		array[idx] = obj;
+	}
+	
+	public ObjectInstance get(int idx)
+	{
+		return array[idx];
+	}
+}

src/main/java/info/sigterm/deob/execution/ClassInstance.java

@@ -29,7 +29,7 @@ public class ClassInstance
 				Attributes attributes = field.getAttributes();
 				ConstantValue cv = (ConstantValue) attributes.findType(AttributeType.CONSTANT_VALUE);
 
-				StaticFieldInstance fi = new StaticFieldInstance(field, cv);
+				StaticFieldInstance fi = new StaticFieldInstance(this, field, cv);
 				this.fields.add(fi);
 			}
 	}

src/main/java/info/sigterm/deob/execution/Execution.java

@@ -20,4 +20,9 @@ public class Execution
 		Path p = new Path(this);
 		p.init(method, args);
 	}
+	
+	public void addPath(Path p)
+	{
+		paths.add(p);
+	}
 }

src/main/java/info/sigterm/deob/execution/FieldInstance.java

@@ -0,0 +1,27 @@
+package info.sigterm.deob.execution;
+
+import info.sigterm.deob.Field;
+
+public class FieldInstance
+{
+	private ObjectInstance object;
+	private Field field;
+	private Object value;
+	
+	public FieldInstance(ObjectInstance object, Field field, Object value)
+	{
+		this.object = object;
+		this.field = field;
+		this.value = value;
+	}
+	
+	public Field getField()
+	{
+		return field;
+	}
+	
+	public Object getValue()
+	{
+		return value;
+	}
+}

src/main/java/info/sigterm/deob/execution/Frame.java

@@ -2,11 +2,15 @@ package info.sigterm.deob.execution;
 
 import info.sigterm.deob.Method;
 import info.sigterm.deob.attributes.Code;
+import info.sigterm.deob.attributes.code.Instruction;
+import info.sigterm.deob.attributes.code.Instructions;
 
 public class Frame
 {
 	private Path path;
 	private Method method;
+	private boolean executing = true;
+	private int pc;
 	private Stack stack;
 	private Variables variables;
 
@@ -36,12 +40,38 @@ public class Frame
 		return variables;
 	}
 
-	public void init(Method method, Object[] args)
+	public void init(Object[] args)
 	{
 		for (Object o : args)
 			stack.push(o);
 
-		Code code = method.getCode();
-		code.execute(this);
+		execute();
+	}
+	
+	public void execute()
+	{
+		Instructions ins = method.getCode().getInstructions();
+		while (executing)
+		{
+			int oldPc = pc;
+			
+			Instruction i = ins.findInstruction(pc);
+			i.execute(this);
+			
+			if (oldPc == pc)
+			{
+				pc += i.getLength();
+			}
+			else
+			{
+				/* jump */
+			}
+		}
+	}
+	
+	public void jump(int offset)
+	{
+		assert offset != 0;
+		pc += offset;
 	}
 }

src/main/java/info/sigterm/deob/execution/ObjectInstance.java

@@ -1,6 +1,42 @@
 package info.sigterm.deob.execution;
 
-public class ObjectInstance
+import info.sigterm.deob.Field;
+import info.sigterm.deob.Fields;
+import info.sigterm.deob.attributes.AttributeType;
+import info.sigterm.deob.attributes.Attributes;
+import info.sigterm.deob.attributes.ConstantValue;
+import info.sigterm.deob.pool.NameAndType;
+
+import java.util.ArrayList;
+
+public class ObjectInstance extends ObjectInstanceBase
 {
-	private ClassInstance type;
+	private ArrayList<FieldInstance> fields = new ArrayList<FieldInstance>();
+	
+	public ObjectInstance(Path path, ClassInstance type)
+	{
+		super(path, type);
+		
+		/* create fields */
+		Fields fields = type.getClassFile().getFields();
+		for (Field field : fields.getFields())
+		{
+			if ((field.getAccessFlags() & Field.ACC_STATIC) != 0)
+				continue;
+			
+			Attributes attributes = field.getAttributes();
+			ConstantValue cv = (ConstantValue) attributes.findType(AttributeType.CONSTANT_VALUE);
+
+			FieldInstance fi = new FieldInstance(this, field, cv.getValue().getObject());
+			this.fields.add(fi);
+		}
+	}
+	
+	public FieldInstance getField(NameAndType nat)
+	{
+		for (FieldInstance f : fields)
+			if (f.getField().getName().equals(nat.getName()) && f.getField().getDescriptor().equals(nat.getDescriptor()))
+				return f;
+		return null;
+	}
 }

src/main/java/info/sigterm/deob/execution/ObjectInstanceBase.java

@@ -0,0 +1,19 @@
+package info.sigterm.deob.execution;
+
+
+public abstract class ObjectInstanceBase
+{
+	private Path path;
+	private ClassInstance type;
+	
+	public ObjectInstanceBase(Path path, ClassInstance type)
+	{
+		this.path = path;
+		this.type = type;
+	}
+	
+	public ClassInstance getType()
+	{
+		return type;
+	}
+}

src/main/java/info/sigterm/deob/execution/Path.java

@@ -9,12 +9,22 @@ public class Path
 {
 	private Execution execution;
 	private ArrayList<ClassInstance> classes = new ArrayList<ClassInstance>();
+	private ArrayList<ObjectInstance> objects = new ArrayList<ObjectInstance>();
 	private java.util.Stack<Frame> frames = new java.util.Stack<Frame>(); // current execution frames
 
 	public Path(Execution execution)
 	{
 		this.execution = execution;
 	}
+	
+	private Path(Path other)
+	{
+		this.execution = other.execution;
+		this.classes = new ArrayList<ClassInstance>(other.classes);
+		this.objects = new ArrayList<ObjectInstance>(other.objects);
+		this.frames = new java.util.Stack<Frame>();
+		this.frames.addAll(other.frames);
+	}
 
 	public Execution getExecution()
 	{
@@ -37,11 +47,35 @@ public class Path
 
 		return cl;
 	}
+	
+	public ObjectInstance createObject(ClassInstance type)
+	{
+		ObjectInstance obj = new ObjectInstance(this, type);
+		objects.add(obj);
+		return obj;
+	}
+	
+	public ArrayInstance createArray(ClassInstance type, int len)
+	{
+		return new ArrayInstance(this, type, len);
+	}
+	
+	public Frame getCurrentFrame()
+	{
+		return frames.peek();
+	}
 
 	public void init(Method method, Object[] args)
 	{
 		Frame f = new Frame(this, method);
 		frames.push(f);
-		f.init(method, args);
+		f.init(args);
+	}
+	
+	public Path dup()
+	{
+		Path other = new Path(this);
+		execution.addPath(other);
+		return other;
 	}
 }

src/main/java/info/sigterm/deob/execution/StaticFieldInstance.java

@@ -5,11 +5,13 @@ import info.sigterm.deob.attributes.ConstantValue;
 
 public class StaticFieldInstance
 {
+	private ClassInstance clazz;
 	private Field field;
 	private ConstantValue value;
 
-	public StaticFieldInstance(Field field, ConstantValue value)
+	public StaticFieldInstance(ClassInstance clazz, Field field, ConstantValue value)
 	{
+		this.clazz = clazz;
 		this.field = field;
 		this.value = value;
 	}