In-heap small typed arrays

src/elements-kind.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 124 matching lines @@
   for (int i = 0; i < kFastElementsKindCount; ++i) {
     if (fast_elements_kind_sequence.Get()[i] == elements_kind) {
       return i;
     }
   }
   UNREACHABLE();
   return 0;
 }
 
 
+ElementsKind GetNextTransitionElementsKind(ElementsKind kind) {
+  switch (kind) {
+#define FIXED_TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) \
+    case TYPE##_ELEMENTS: return EXTERNAL_##TYPE##_ELEMENTS;
+
+    TYPED_ARRAYS(FIXED_TYPED_ARRAY_CASE)
+#undef FIXED_TYPED_ARRAY_CASE
+    default: {
+      int index = GetSequenceIndexFromFastElementsKind(kind);
+      return GetFastElementsKindFromSequenceIndex(index + 1);
+    }
+  }
+}
+
+
 ElementsKind GetNextMoreGeneralFastElementsKind(ElementsKind elements_kind,
                                                 bool allow_only_packed) {
   ASSERT(IsFastElementsKind(elements_kind));
   ASSERT(elements_kind != TERMINAL_FAST_ELEMENTS_KIND);
   while (true) {
-    int index =
-        GetSequenceIndexFromFastElementsKind(elements_kind) + 1;
-    elements_kind = GetFastElementsKindFromSequenceIndex(index);
+    elements_kind = GetNextTransitionElementsKind(elements_kind);
     if (!IsFastHoleyElementsKind(elements_kind) || !allow_only_packed) {
       return elements_kind;
     }
   }
   UNREACHABLE();
   return TERMINAL_FAST_ELEMENTS_KIND;
 }
 
 
 bool IsMoreGeneralElementsKindTransition(ElementsKind from_kind,
@@ skipping 15 matching lines @@
       return to_kind == FAST_HOLEY_ELEMENTS;
     case FAST_HOLEY_ELEMENTS:
       return false;
     default:
       return false;
   }
 }
 
 
 } }  // namespace v8::internal