1 files changed, 52 insertions, 0 deletions
diff --git a/zpu/sw/simulator/com/zylin/zpu/stats/StatKeeper.java b/zpu/sw/simulator/com/zylin/zpu/stats/StatKeeper.java
new file mode 100644
index 0000000..9e16e32
--- /dev/null
+++ b/zpu/sw/simulator/com/zylin/zpu/stats/StatKeeper.java
@@ -0,0 +1,52 @@
+package com.zylin.zpu.stats;
+
+import com.zylin.zpu.simulator.Machine;
+import com.zylin.zpu.simulator.State;
+
+public class StatKeeper
+{
+	private Instruction top=new Instruction();
+	private int trackPos;
+
+    private State[] state = new State[3];
+    private Machine simulator;
+	/**
+     * @param simulator
+     */
+    public StatKeeper(Machine simulator)
+    {
+        this.simulator=simulator;
+		for (int i=0; i<state.length; i++)
+		{
+			state[i]=new State();
+		}
+    }
+    /**
+	 * this instruction has been retired. Count it.
+	 */
+	public void countInstruction(int instruction)
+	{
+		State currentState=state[trackPos%state.length];
+		currentState.cycle=simulator.getPrevCycles(); // start of instruction
+		currentState.insn=instruction;
+		trackPos++;
+        int backtrackNum;
+		backtrackNum=Math.min(trackPos, state.length);
+		for (int i=0; i<backtrackNum; i++)
+		{
+            Instruction t=top;
+			for (int j=0; j<=i; j++)
+			{
+                currentState=state[(trackPos-backtrackNum+j)%state.length];
+				t=t.addInstruction(currentState.insn);
+			}
+            t.count++;
+		}
+		
+	}
+    public void printStats()
+    {
+        top.printStats();
+        
+    }
+}