Implement in-heap backing store for typed arrays.

src/elements-kind.h

 // 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 45 matching lines @@
   EXTERNAL_BYTE_ELEMENTS,
   EXTERNAL_UNSIGNED_BYTE_ELEMENTS,
   EXTERNAL_SHORT_ELEMENTS,
   EXTERNAL_UNSIGNED_SHORT_ELEMENTS,
   EXTERNAL_INT_ELEMENTS,
   EXTERNAL_UNSIGNED_INT_ELEMENTS,
   EXTERNAL_FLOAT_ELEMENTS,
   EXTERNAL_DOUBLE_ELEMENTS,
   EXTERNAL_PIXEL_ELEMENTS,
 
+  // Fixed typed arrays
+  UINT8_ELEMENTS,
+  INT8_ELEMENTS,
+  UINT16_ELEMENTS,
+  INT16_ELEMENTS,
+  UINT32_ELEMENTS,
+  INT32_ELEMENTS,
+  FLOAT32_ELEMENTS,
+  FLOAT64_ELEMENTS,
+  UINT8_CLAMPED_ELEMENTS,
+
   // Derived constants from ElementsKind
   FIRST_ELEMENTS_KIND = FAST_SMI_ELEMENTS,
-  LAST_ELEMENTS_KIND = EXTERNAL_PIXEL_ELEMENTS,
+  LAST_ELEMENTS_KIND = UINT8_CLAMPED_ELEMENTS,
   FIRST_FAST_ELEMENTS_KIND = FAST_SMI_ELEMENTS,
   LAST_FAST_ELEMENTS_KIND = FAST_HOLEY_DOUBLE_ELEMENTS,
   FIRST_EXTERNAL_ARRAY_ELEMENTS_KIND = EXTERNAL_BYTE_ELEMENTS,
   LAST_EXTERNAL_ARRAY_ELEMENTS_KIND = EXTERNAL_PIXEL_ELEMENTS,
+  FIRST_FIXED_TYPED_ARRAY_ELEMENTS_KIND = UINT8_ELEMENTS,
+  LAST_FIXED_TYPED_ARRAY_ELEMENTS_KIND = UINT8_CLAMPED_ELEMENTS,
   TERMINAL_FAST_ELEMENTS_KIND = FAST_HOLEY_ELEMENTS
 };
 
 const int kElementsKindCount = LAST_ELEMENTS_KIND - FIRST_ELEMENTS_KIND + 1;
 const int kFastElementsKindCount = LAST_FAST_ELEMENTS_KIND -
     FIRST_FAST_ELEMENTS_KIND + 1;
 
 // The number to add to a packed elements kind to reach a holey elements kind
 const int kFastElementsKindPackedToHoley =
     FAST_HOLEY_SMI_ELEMENTS - FAST_SMI_ELEMENTS;
@@ skipping 13 matching lines @@
   return kind == DICTIONARY_ELEMENTS;
 }
 
 
 inline bool IsExternalArrayElementsKind(ElementsKind kind) {
   return kind >= FIRST_EXTERNAL_ARRAY_ELEMENTS_KIND &&
       kind <= LAST_EXTERNAL_ARRAY_ELEMENTS_KIND;
 }
 
 
+inline bool IsFixedTypedArrayElementsKind(ElementsKind kind) {
+  return kind >= FIRST_FIXED_TYPED_ARRAY_ELEMENTS_KIND &&
+      kind <= LAST_FIXED_TYPED_ARRAY_ELEMENTS_KIND;
+}
+
+
 inline bool IsFastElementsKind(ElementsKind kind) {
   ASSERT(FIRST_FAST_ELEMENTS_KIND == 0);
   return kind <= FAST_HOLEY_DOUBLE_ELEMENTS;
 }
 
 
 inline bool IsFastDoubleElementsKind(ElementsKind kind) {
   return kind == FAST_DOUBLE_ELEMENTS ||
       kind == FAST_HOLEY_DOUBLE_ELEMENTS;
 }
 
 
 inline bool IsExternalFloatOrDoubleElementsKind(ElementsKind kind) {
   return kind == EXTERNAL_DOUBLE_ELEMENTS ||
       kind == EXTERNAL_FLOAT_ELEMENTS;
 }
 
 
+inline bool IsFixedFloatOrDoubleElementsKind(ElementsKind kind) {
+  return kind == FLOAT32_ELEMENTS || kind == FLOAT64_ELEMENTS;
+}
+
+
 inline bool IsDoubleOrFloatElementsKind(ElementsKind kind) {
   return IsFastDoubleElementsKind(kind) ||
-      IsExternalFloatOrDoubleElementsKind(kind);
+      IsExternalFloatOrDoubleElementsKind(kind) ||
+      IsFixedFloatOrDoubleElementsKind(kind);

[Toon Verwaest, 2013/12/23 10:40:32]

What about just renaming this to IsFixedFloatElementsKind, given that now you
called them both Float[32|64]?

[Dmitry Lomov (no reviews), 2014/01/07 15:48:43]

Done.

 }
 
 
 inline bool IsFastSmiOrObjectElementsKind(ElementsKind kind) {
   return kind == FAST_SMI_ELEMENTS ||
       kind == FAST_HOLEY_SMI_ELEMENTS ||
       kind == FAST_ELEMENTS ||
       kind == FAST_HOLEY_ELEMENTS;
 }
 
@@ skipping 93 matching lines @@
     bool allow_only_packed) {
   return IsFastElementsKind(elements_kind) &&
       (elements_kind != TERMINAL_FAST_ELEMENTS_KIND &&
        (!allow_only_packed || elements_kind != FAST_ELEMENTS));
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ELEMENTS_KIND_H_