diff --git a/src/main.c b/src/main.c
index a14e4452..a8c38895 100644
--- a/src/main.c
+++ b/src/main.c
@@ -37,7 +37,7 @@ main()
 
   pic = pic_open();
 
-  test_object_creation(pic);
+  //test_object_creation(pic);
 
   while (1) {
     printf("> ");
@@ -52,13 +52,16 @@ main()
     }
     line[char_index] = '\0';
 
-    /* echo */
+    /* read */
     v = pic_parse(pic, line);
 
-    //pic_debug(pic, pic_eval(pic, v, pic->global_env));
+    /* eval */
     proc = pic_codegen(pic, v, pic->global_env);
     v = pic_run(pic, proc, pic_nil_value());
+
+    /* print */
     pic_debug(pic, v);
+
     printf("\n");
   }
 
diff --git a/src/vm.c b/src/vm.c
index f8d9a93f..d8f514b7 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -22,50 +22,7 @@ struct pic_irep {
   size_t clen, ccapa;
 };
 
-pic_value
-pic_run(pic_state *pic, struct pic_proc *proc, pic_value args)
-{
-  struct pic_code *pc;
-  pic_value *sp;
-
-  pc = proc->u.irep->code;
-  sp = pic->sp;
-
-  while (1) {
-    switch (pc->insn) {
-    case OP_PUSHNIL: {
-      *++sp = pic_nil_value();
-      break;
-    }
-    case OP_PUSHI: {
-      *++sp = pic_int_value(pc->u.i);
-      break;
-    }
-    case OP_CONS: {
-      pic_value a, b;
-      a = *sp--;
-      b = *sp--;
-      *++sp = pic_cons(pic, a, b);
-      break;
-    }
-    case OP_ADD: {
-      pic_value a, b;
-      a = *sp--;
-      b = *sp--;
-      *++sp = pic_int_value(pic_int(a) + pic_int(b));
-      break;
-    }
-    case OP_STOP:
-      goto STOP;
-    }
-    pc++;
-  }
-
- STOP:
-  return *sp;
-}
-
-void
+static void
 pic_gen(pic_state *pic, struct pic_irep *irep, pic_value obj, struct pic_env *env)
 {
   pic_value sCONS, sADD;
@@ -137,3 +94,46 @@ pic_codegen(pic_state *pic, pic_value obj, struct pic_env *env)
 
   return proc;
 }
+
+pic_value
+pic_run(pic_state *pic, struct pic_proc *proc, pic_value args)
+{
+  struct pic_code *pc;
+  pic_value *sp;
+
+  pc = proc->u.irep->code;
+  sp = pic->sp;
+
+  while (1) {
+    switch (pc->insn) {
+    case OP_PUSHNIL: {
+      *++sp = pic_nil_value();
+      break;
+    }
+    case OP_PUSHI: {
+      *++sp = pic_int_value(pc->u.i);
+      break;
+    }
+    case OP_CONS: {
+      pic_value a, b;
+      a = *sp--;
+      b = *sp--;
+      *++sp = pic_cons(pic, a, b);
+      break;
+    }
+    case OP_ADD: {
+      pic_value a, b;
+      a = *sp--;
+      b = *sp--;
+      *++sp = pic_int_value(pic_int(a) + pic_int(b));
+      break;
+    }
+    case OP_STOP:
+      goto STOP;
+    }
+    pc++;
+  }
+
+ STOP:
+  return *sp;
+}