Separating transitions from descriptors.

src/property.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 37 matching lines @@
   }
 
   PrintF(out, "LookupResult:\n");
   PrintF(out, " -cacheable = %s\n", IsCacheable() ? "true" : "false");
   PrintF(out, " -attributes = %x\n", GetAttributes());
   switch (type()) {
     case NORMAL:
       PrintF(out, " -type = normal\n");
       PrintF(out, " -entry = %d", GetDictionaryEntry());
       break;
-    case MAP_TRANSITION:
-      PrintF(out, " -type = map transition\n");
-      PrintF(out, " -map:\n");
-      GetTransitionMap()->Print(out);
-      PrintF(out, "\n");
-      break;
     case CONSTANT_FUNCTION:
       PrintF(out, " -type = constant function\n");
       PrintF(out, " -function:\n");
       GetConstantFunction()->Print(out);
       PrintF(out, "\n");
       break;
     case FIELD:
       PrintF(out, " -type = field\n");
       PrintF(out, " -index = %d", GetFieldIndex());
       PrintF(out, "\n");
       break;
     case CALLBACKS:
       PrintF(out, " -type = call backs\n");
       PrintF(out, " -callback object:\n");
       GetCallbackObject()->Print(out);
       break;
     case HANDLER:
       PrintF(out, " -type = lookup proxy\n");
       break;
     case INTERCEPTOR:
       PrintF(out, " -type = lookup interceptor\n");
       break;
-    case CONSTANT_TRANSITION:
-      PrintF(out, " -type = constant property transition\n");
-      PrintF(out, " -map:\n");
-      GetTransitionMap()->Print(out);
-      PrintF(out, "\n");
-      break;
+    case TRANSITION:
+      switch (GetTransitionDetails().type()) {
+        case FIELD:
+          PrintF(out, " -type = map transition\n");
+          PrintF(out, " -map:\n");
+          GetTransitionMap()->Print(out);
+          PrintF(out, "\n");
+          return;
+        case CONSTANT_FUNCTION:
+          PrintF(out, " -type = constant property transition\n");
+          PrintF(out, " -map:\n");
+          GetTransitionMap()->Print(out);
+          PrintF(out, "\n");
+          return;
+        case CALLBACKS:
+          PrintF(out, " -type = callbacks transition\n");
+          PrintF(out, " -callback object:\n");
+          GetCallbackObject()->Print(out);
+          return;
+        default:
+          UNREACHABLE();
+          return;
+      }
     case NONEXISTENT:
       UNREACHABLE();
       break;
   }
 }
 
 
 void Descriptor::Print(FILE* out) {
   PrintF(out, "Descriptor ");
   GetKey()->ShortPrint(out);
   PrintF(out, " @ ");
   GetValue()->ShortPrint(out);
   PrintF(out, " %d\n", GetDetails().index());
 }
 
 
 #endif
 
 
-bool Descriptor::ContainsTransition() {
-  switch (details_.type()) {
-    case MAP_TRANSITION:
-    case CONSTANT_TRANSITION:
-      return true;
-    case CALLBACKS: {
-      if (!value_->IsAccessorPair()) return false;
-      AccessorPair* accessors = AccessorPair::cast(value_);
-      return accessors->getter()->IsMap() || accessors->setter()->IsMap();
-    }
-    case NORMAL:
-    case FIELD:
-    case CONSTANT_FUNCTION:
-    case HANDLER:
-    case INTERCEPTOR:
-      return false;
-    case NONEXISTENT:
-      UNREACHABLE();
-      break;
-  }
-  UNREACHABLE();  // Keep the compiler happy.
-  return false;
-}
-
-
 } }  // namespace v8::internal