remove all MRB_TT_MAIN from source

5 files changed, 12 insertions, 15 deletions

diff --git a/src/class.c b/src/class.c
index 84132c38a..875457eb8 100644
--- a/src/class.c
+++ b/src/class.c
@@ -911,7 +911,6 @@ mrb_singleton_class(mrb_state *mrb, mrb_value v)
     return mrb_obj_value(mrb->false_class);
   case MRB_TT_TRUE:
     return mrb_obj_value(mrb->true_class);
-  case MRB_TT_MAIN:
   case MRB_TT_VOIDP:
     return mrb_obj_value(mrb->object_class);
   case MRB_TT_SYMBOL:
diff --git a/src/gc.c b/src/gc.c
index 53a5eb3ed..1c668bbf3 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -392,7 +392,6 @@ gc_mark_children(mrb_state *mrb, struct RBasic *obj)
     }
     /* fall through */
 
-  case MRB_TT_MAIN:
   case MRB_TT_OBJECT:
   case MRB_TT_DATA:
     mrb_gc_mark_iv(mrb, (struct RObject*)obj);
@@ -479,7 +478,6 @@ obj_free(mrb_state *mrb, struct RBasic *obj)
     /* cannot happen */
     return;
 
-  case MRB_TT_MAIN:
   case MRB_TT_OBJECT:
     mrb_gc_free_iv(mrb, (struct RObject*)obj);
     break;
@@ -561,6 +559,8 @@ root_scan_phase(mrb_state *mrb)
   }
   /* mark class hierarchy */
   mrb_gc_mark(mrb, (struct RBasic*)mrb->object_class);
+  /* mark top_self */
+  mrb_gc_mark(mrb, (struct RBasic*)mrb->top_self);
   /* mark exception */
   mrb_gc_mark(mrb, (struct RBasic*)mrb->exc);
   /* mark stack */
@@ -620,7 +620,6 @@ gc_gray_mark(mrb_state *mrb, struct RBasic *obj)
     }
     break;
 
-  case MRB_TT_MAIN:
   case MRB_TT_OBJECT:
   case MRB_TT_DATA:
     children += mrb_gc_mark_iv_size(mrb, (struct RObject*)obj);
diff --git a/src/kernel.c b/src/kernel.c
index ce96b902a..96dbf0635 100644
--- a/src/kernel.c
+++ b/src/kernel.c
@@ -55,9 +55,6 @@ mrb_obj_inspect(mrb_state *mrb, mrb_value obj)
   if ((mrb_type(obj) == MRB_TT_OBJECT) && mrb_obj_basic_to_s_p(mrb, obj)) {
     return mrb_obj_iv_inspect(mrb, mrb_obj_ptr(obj));
   }
-  else if (mrb_type(obj) == MRB_TT_MAIN) {
-    return mrb_str_new(mrb, "main", 4);
-  }
   return mrb_any_to_s(mrb, obj);
 }
 
@@ -306,7 +303,6 @@ init_copy(mrb_state *mrb, mrb_value dest, mrb_value obj)
       case MRB_TT_SCLASS:
       case MRB_TT_HASH:
       case MRB_TT_DATA:
-      case MRB_TT_MAIN:
         mrb_iv_copy(mrb, dest, obj);
         break;
 
diff --git a/src/state.c b/src/state.c
index 070237434..4e7225c7c 100644
--- a/src/state.c
+++ b/src/state.c
@@ -15,6 +15,12 @@ void mrb_init_heap(mrb_state*);
 void mrb_init_core(mrb_state*);
 void mrb_final_core(mrb_state*);
 
+static mrb_value
+inspect_main(mrb_state *mrb, mrb_value mod)
+{
+  return mrb_str_new(mrb, "main", 4);
+}
+
 mrb_state*
 mrb_open_allocf(mrb_allocf f, void *ud)
 {
@@ -161,11 +167,9 @@ mrb_add_irep(mrb_state *mrb)
 mrb_value
 mrb_top_self(mrb_state *mrb)
 {
-  if(mrb->top_self == NULL)
-  {
-    mrb->top_self = (mrb_value *)mrb_calloc(mrb, 1, sizeof(mrb_value));
-    *(mrb->top_self) = mrb_class_new_instance(mrb, 0, NULL, mrb->object_class);
-    mrb->top_self->tt = MRB_TT_MAIN;
+  if (!mrb->top_self) {
+    mrb->top_self = (struct RObject*)mrb_obj_alloc(mrb, MRB_TT_OBJECT, mrb->object_class);  
+    mrb_define_singleton_method(mrb, mrb->top_self, "inspect", inspect_main, ARGS_NONE());
   }
-  return *(mrb->top_self);
+  return mrb_obj_value(mrb->top_self);
 }
diff --git a/src/variable.c b/src/variable.c
index 669a86fc2..5bacd5141 100644
--- a/src/variable.c
+++ b/src/variable.c
@@ -419,7 +419,6 @@ obj_iv_p(mrb_value obj)
     case MRB_TT_SCLASS:
     case MRB_TT_HASH:
     case MRB_TT_DATA:
-    case MRB_TT_MAIN:
       return TRUE;
     default:
       return FALSE;