Implement in-heap backing store for typed arrays.

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index ea3cef8c4a5983bea9166278c82662cf95cfd724..5e3d75909d6053fea2f9dea5aabc5520fb9e5223 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -2149,6 +2149,8 @@ class ScavengingVisitor : public StaticVisitorBase {
     table_.Register(kVisitByteArray, &EvacuateByteArray);
     table_.Register(kVisitFixedArray, &EvacuateFixedArray);
     table_.Register(kVisitFixedDoubleArray, &EvacuateFixedDoubleArray);
+    table_.Register(kVisitFixedTypedArray, &EvacuateFixedTypedArray);
+    table_.Register(kVisitFixedFloat64Array, &EvacuateFixedFloat64Array);
 
     table_.Register(kVisitNativeContext,
                     &ObjectEvacuationStrategy<POINTER_OBJECT>::
@@ -2389,6 +2391,24 @@ class ScavengingVisitor : public StaticVisitorBase {
   }
 
 
+  static inline void EvacuateFixedTypedArray(Map* map,
+                                             HeapObject** slot,
+                                             HeapObject* object) {
+    int object_size = reinterpret_cast<FixedTypedArrayBase*>(object)->size();
+    EvacuateObject<DATA_OBJECT, kObjectAlignment>(
+        map, slot, object, object_size);
+  }
+
+
+  static inline void EvacuateFixedFloat64Array(Map* map,
+                                               HeapObject** slot,
+                                               HeapObject* object) {
+    int object_size = reinterpret_cast<FixedFloat64Array*>(object)->size();
+    EvacuateObject<DATA_OBJECT, kDoubleAlignment>(
+        map, slot, object, object_size);
+  }
+
+
   static inline void EvacuateByteArray(Map* map,
                                        HeapObject** slot,
                                        HeapObject* object) {
@@ -2778,291 +2798,136 @@ bool Heap::CreateInitialMaps() {
   constant_pool_array_map()->set_prototype(null_value());
   constant_pool_array_map()->set_constructor(null_value());
 
-  { MaybeObject* maybe_obj =
-        AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_fixed_cow_array_map(Map::cast(obj));
-  ASSERT(fixed_array_map() != fixed_cow_array_map());
-
-  { MaybeObject* maybe_obj =
-        AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_scope_info_map(Map::cast(obj));
-
-  { MaybeObject* maybe_obj = AllocateMap(HEAP_NUMBER_TYPE, HeapNumber::kSize);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_heap_number_map(Map::cast(obj));
-
-  { MaybeObject* maybe_obj = AllocateMap(SYMBOL_TYPE, Symbol::kSize);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_symbol_map(Map::cast(obj));
-
-  { MaybeObject* maybe_obj = AllocateMap(FOREIGN_TYPE, Foreign::kSize);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_foreign_map(Map::cast(obj));
-
-  for (unsigned i = 0; i < ARRAY_SIZE(string_type_table); i++) {
-    const StringTypeTable& entry = string_type_table[i];
-    { MaybeObject* maybe_obj = AllocateMap(entry.type, entry.size);
-      if (!maybe_obj->ToObject(&obj)) return false;
+  { // Map allocation
+#define ALLOCATE_MAP(instance_type, size, field_name)                          \
+    { Map* map;                                                                \
+      if (!AllocateMap((instance_type), size)->To(&map)) return false;         \
+      set_##field_name##_map(map);                                             \
     }
-    roots_[entry.index] = Map::cast(obj);
-  }
-
-  { MaybeObject* maybe_obj = AllocateMap(STRING_TYPE, kVariableSizeSentinel);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_undetectable_string_map(Map::cast(obj));
-  Map::cast(obj)->set_is_undetectable();
-
-  { MaybeObject* maybe_obj =
-        AllocateMap(ASCII_STRING_TYPE, kVariableSizeSentinel);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_undetectable_ascii_string_map(Map::cast(obj));
-  Map::cast(obj)->set_is_undetectable();
-
-  { MaybeObject* maybe_obj =
-        AllocateMap(FIXED_DOUBLE_ARRAY_TYPE, kVariableSizeSentinel);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_fixed_double_array_map(Map::cast(obj));
-
-  { MaybeObject* maybe_obj =
-        AllocateMap(BYTE_ARRAY_TYPE, kVariableSizeSentinel);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_byte_array_map(Map::cast(obj));
-
-  { MaybeObject* maybe_obj =
-        AllocateMap(FREE_SPACE_TYPE, kVariableSizeSentinel);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_free_space_map(Map::cast(obj));
-
-  { MaybeObject* maybe_obj = AllocateByteArray(0, TENURED);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_empty_byte_array(ByteArray::cast(obj));
-
-  { MaybeObject* maybe_obj =
-        AllocateMap(EXTERNAL_PIXEL_ARRAY_TYPE, ExternalArray::kAlignedSize);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_external_pixel_array_map(Map::cast(obj));
-
-  { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_BYTE_ARRAY_TYPE,
-                                         ExternalArray::kAlignedSize);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_external_byte_array_map(Map::cast(obj));
-
-  { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_UNSIGNED_BYTE_ARRAY_TYPE,
-                                         ExternalArray::kAlignedSize);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_external_unsigned_byte_array_map(Map::cast(obj));
-
-  { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_SHORT_ARRAY_TYPE,
-                                         ExternalArray::kAlignedSize);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_external_short_array_map(Map::cast(obj));
-
-  { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_UNSIGNED_SHORT_ARRAY_TYPE,
-                                         ExternalArray::kAlignedSize);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_external_unsigned_short_array_map(Map::cast(obj));
-
-  { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_INT_ARRAY_TYPE,
-                                         ExternalArray::kAlignedSize);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_external_int_array_map(Map::cast(obj));
-
-  { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_UNSIGNED_INT_ARRAY_TYPE,
-                                         ExternalArray::kAlignedSize);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_external_unsigned_int_array_map(Map::cast(obj));
-
-  { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_FLOAT_ARRAY_TYPE,
-                                         ExternalArray::kAlignedSize);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_external_float_array_map(Map::cast(obj));
-
-  { MaybeObject* maybe_obj =
-        AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_non_strict_arguments_elements_map(Map::cast(obj));
-
-  { MaybeObject* maybe_obj = AllocateMap(EXTERNAL_DOUBLE_ARRAY_TYPE,
-                                         ExternalArray::kAlignedSize);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_external_double_array_map(Map::cast(obj));
-
-  { MaybeObject* maybe_obj = AllocateEmptyExternalArray(kExternalByteArray);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_empty_external_byte_array(ExternalArray::cast(obj));
-
-  { MaybeObject* maybe_obj =
-        AllocateEmptyExternalArray(kExternalUnsignedByteArray);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_empty_external_unsigned_byte_array(ExternalArray::cast(obj));
-
-  { MaybeObject* maybe_obj = AllocateEmptyExternalArray(kExternalShortArray);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_empty_external_short_array(ExternalArray::cast(obj));
-
-  { MaybeObject* maybe_obj = AllocateEmptyExternalArray(
-      kExternalUnsignedShortArray);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_empty_external_unsigned_short_array(ExternalArray::cast(obj));
-
-  { MaybeObject* maybe_obj = AllocateEmptyExternalArray(kExternalIntArray);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_empty_external_int_array(ExternalArray::cast(obj));
-
-  { MaybeObject* maybe_obj =
-        AllocateEmptyExternalArray(kExternalUnsignedIntArray);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_empty_external_unsigned_int_array(ExternalArray::cast(obj));
-
-  { MaybeObject* maybe_obj = AllocateEmptyExternalArray(kExternalFloatArray);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_empty_external_float_array(ExternalArray::cast(obj));
-
-  { MaybeObject* maybe_obj = AllocateEmptyExternalArray(kExternalDoubleArray);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_empty_external_double_array(ExternalArray::cast(obj));
-
-  { MaybeObject* maybe_obj = AllocateEmptyExternalArray(kExternalPixelArray);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_empty_external_pixel_array(ExternalArray::cast(obj));
-
-  { MaybeObject* maybe_obj = AllocateMap(CODE_TYPE, kVariableSizeSentinel);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_code_map(Map::cast(obj));
-
-  { MaybeObject* maybe_obj = AllocateMap(CELL_TYPE, Cell::kSize);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_cell_map(Map::cast(obj));
 
-  { MaybeObject* maybe_obj = AllocateMap(PROPERTY_CELL_TYPE,
-                                         PropertyCell::kSize);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_global_property_cell_map(Map::cast(obj));
+#define ALLOCATE_VARSIZE_MAP(instance_type, field_name)                        \
+    ALLOCATE_MAP(instance_type, kVariableSizeSentinel, field_name)
 
-  { MaybeObject* maybe_obj = AllocateMap(FILLER_TYPE, kPointerSize);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_one_pointer_filler_map(Map::cast(obj));
+    ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, fixed_cow_array)
+    ASSERT(fixed_array_map() != fixed_cow_array_map());
 
-  { MaybeObject* maybe_obj = AllocateMap(FILLER_TYPE, 2 * kPointerSize);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_two_pointer_filler_map(Map::cast(obj));
+    ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, scope_info)
+    ALLOCATE_MAP(HEAP_NUMBER_TYPE, HeapNumber::kSize, heap_number)
+    ALLOCATE_MAP(SYMBOL_TYPE, Symbol::kSize, symbol)
+    ALLOCATE_MAP(FOREIGN_TYPE, Foreign::kSize, foreign)
 
-  for (unsigned i = 0; i < ARRAY_SIZE(struct_table); i++) {
-    const StructTable& entry = struct_table[i];
-    { MaybeObject* maybe_obj = AllocateMap(entry.type, entry.size);
-      if (!maybe_obj->ToObject(&obj)) return false;
+    for (unsigned i = 0; i < ARRAY_SIZE(string_type_table); i++) {
+      const StringTypeTable& entry = string_type_table[i];
+      { MaybeObject* maybe_obj = AllocateMap(entry.type, entry.size);
+        if (!maybe_obj->ToObject(&obj)) return false;
+      }
+      roots_[entry.index] = Map::cast(obj);
     }
-    roots_[entry.index] = Map::cast(obj);
-  }
-
-  { MaybeObject* maybe_obj =
-        AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_hash_table_map(Map::cast(obj));
 
-  { MaybeObject* maybe_obj =
-        AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_function_context_map(Map::cast(obj));
-
-  { MaybeObject* maybe_obj =
-        AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_catch_context_map(Map::cast(obj));
+    ALLOCATE_VARSIZE_MAP(STRING_TYPE, undetectable_string)
+    undetectable_string_map()->set_is_undetectable();
+
+    ALLOCATE_VARSIZE_MAP(ASCII_STRING_TYPE, undetectable_ascii_string);
+    undetectable_ascii_string_map()->set_is_undetectable();
+
+    ALLOCATE_VARSIZE_MAP(FIXED_DOUBLE_ARRAY_TYPE, fixed_double_array)
+    ALLOCATE_VARSIZE_MAP(BYTE_ARRAY_TYPE, byte_array)
+    ALLOCATE_VARSIZE_MAP(FREE_SPACE_TYPE, free_space)
+
+#define ALLOCATE_EXTERNAL_ARRAY_MAP(TYPE, type)                               \
+    ALLOCATE_MAP(EXTERNAL_##TYPE##_ARRAY_TYPE, ExternalArray::kAlignedSize,   \
+        external_##type##_array)
+
+    ALLOCATE_EXTERNAL_ARRAY_MAP(PIXEL, pixel)
+    ALLOCATE_EXTERNAL_ARRAY_MAP(BYTE, byte)
+    ALLOCATE_EXTERNAL_ARRAY_MAP(UNSIGNED_BYTE, unsigned_byte)
+    ALLOCATE_EXTERNAL_ARRAY_MAP(SHORT, short)  // NOLINT
+    ALLOCATE_EXTERNAL_ARRAY_MAP(UNSIGNED_SHORT, unsigned_short)
+    ALLOCATE_EXTERNAL_ARRAY_MAP(INT, int)
+    ALLOCATE_EXTERNAL_ARRAY_MAP(UNSIGNED_INT, unsigned_int)
+    ALLOCATE_EXTERNAL_ARRAY_MAP(FLOAT, float)
+    ALLOCATE_EXTERNAL_ARRAY_MAP(DOUBLE, double)
+#undef ALLOCATE_EXTERNAL_ARRAY_MAP
+
+    ALLOCATE_VARSIZE_MAP(FIXED_UINT8_ARRAY_TYPE, fixed_uint8_array)
+    ALLOCATE_VARSIZE_MAP(FIXED_UINT8_CLAMPED_ARRAY_TYPE,
+        fixed_uint8_clamped_array)
+    ALLOCATE_VARSIZE_MAP(FIXED_INT8_ARRAY_TYPE, fixed_int8_array)
+    ALLOCATE_VARSIZE_MAP(FIXED_UINT16_ARRAY_TYPE, fixed_uint16_array)
+    ALLOCATE_VARSIZE_MAP(FIXED_INT16_ARRAY_TYPE, fixed_int16_array)
+    ALLOCATE_VARSIZE_MAP(FIXED_UINT32_ARRAY_TYPE, fixed_uint32_array)
+    ALLOCATE_VARSIZE_MAP(FIXED_INT32_ARRAY_TYPE, fixed_int32_array)
+    ALLOCATE_VARSIZE_MAP(FIXED_FLOAT32_ARRAY_TYPE, fixed_float32_array)
+    ALLOCATE_VARSIZE_MAP(FIXED_FLOAT64_ARRAY_TYPE, fixed_float64_array)
+
+    ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, non_strict_arguments_elements)
+
+    ALLOCATE_VARSIZE_MAP(CODE_TYPE, code)
+
+    ALLOCATE_MAP(CELL_TYPE, Cell::kSize, cell)
+    ALLOCATE_MAP(PROPERTY_CELL_TYPE, PropertyCell::kSize, global_property_cell)
+    ALLOCATE_MAP(FILLER_TYPE, kPointerSize, one_pointer_filler)
+    ALLOCATE_MAP(FILLER_TYPE, 2 * kPointerSize, two_pointer_filler)
+
+
+    for (unsigned i = 0; i < ARRAY_SIZE(struct_table); i++) {
+      const StructTable& entry = struct_table[i];
+      Map* map;
+      if (!AllocateMap(entry.type, entry.size)->To(&map))
+        return false;
+      roots_[entry.index] = map;
+    }
 
-  { MaybeObject* maybe_obj =
-        AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_with_context_map(Map::cast(obj));
+    ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, hash_table)
 
-  { MaybeObject* maybe_obj =
-        AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_block_context_map(Map::cast(obj));
+    ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, function_context)
+    ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, catch_context)
+    ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, with_context)
+    ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, block_context)
+    ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, module_context)
+    ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, global_context)
 
-  { MaybeObject* maybe_obj =
-        AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_module_context_map(Map::cast(obj));
+    ALLOCATE_VARSIZE_MAP(FIXED_ARRAY_TYPE, native_context)
+    native_context_map()->set_dictionary_map(true);
+    native_context_map()->set_visitor_id(
+        StaticVisitorBase::kVisitNativeContext);
 
-  { MaybeObject* maybe_obj =
-        AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_global_context_map(Map::cast(obj));
+    ALLOCATE_MAP(SHARED_FUNCTION_INFO_TYPE, SharedFunctionInfo::kAlignedSize,
+        shared_function_info)
 
-  { MaybeObject* maybe_obj =
-        AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel);
-    if (!maybe_obj->ToObject(&obj)) return false;
+    ALLOCATE_MAP(JS_MESSAGE_OBJECT_TYPE, JSMessageObject::kSize,
+        message_object)
+    ALLOCATE_MAP(JS_OBJECT_TYPE, JSObject::kHeaderSize + kPointerSize,
+        external)
+    external_map()->set_is_extensible(false);
+#undef ALLOCATE_VARSIZE_MAP
+#undef ALLOCATE_MAP
   }
-  Map* native_context_map = Map::cast(obj);
-  native_context_map->set_dictionary_map(true);
-  native_context_map->set_visitor_id(StaticVisitorBase::kVisitNativeContext);
-  set_native_context_map(native_context_map);
 
-  { MaybeObject* maybe_obj = AllocateMap(SHARED_FUNCTION_INFO_TYPE,
-                                         SharedFunctionInfo::kAlignedSize);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_shared_function_info_map(Map::cast(obj));
+  { // Empty arrays
+    { ByteArray* byte_array;
+      if (!AllocateByteArray(0, TENURED)->To(&byte_array)) return false;
+      set_empty_byte_array(byte_array);
+    }
 
-  { MaybeObject* maybe_obj = AllocateMap(JS_MESSAGE_OBJECT_TYPE,
-                                         JSMessageObject::kSize);
-    if (!maybe_obj->ToObject(&obj)) return false;
-  }
-  set_message_object_map(Map::cast(obj));
+#define ALLOCATE_EMPTY_EXTERNAL_ARRAY(Type, type)                              \
+    { ExternalArray* obj;                                                      \
+      if (!AllocateEmptyExternalArray(kExternal##Type##Array)->To(&obj))       \
+          return false;                                                        \
+      set_empty_external_##type##_array(obj);                                  \
+    }
 
-  Map* external_map;
-  { MaybeObject* maybe_obj =
-        AllocateMap(JS_OBJECT_TYPE, JSObject::kHeaderSize + kPointerSize);
-    if (!maybe_obj->To(&external_map)) return false;
+    ALLOCATE_EMPTY_EXTERNAL_ARRAY(Byte, byte)
+    ALLOCATE_EMPTY_EXTERNAL_ARRAY(UnsignedByte, unsigned_byte)
+    ALLOCATE_EMPTY_EXTERNAL_ARRAY(Short, short)  // NOLINT
+    ALLOCATE_EMPTY_EXTERNAL_ARRAY(UnsignedShort, unsigned_short)
+    ALLOCATE_EMPTY_EXTERNAL_ARRAY(Int, int)
+    ALLOCATE_EMPTY_EXTERNAL_ARRAY(UnsignedInt, unsigned_int)
+    ALLOCATE_EMPTY_EXTERNAL_ARRAY(Float, float)
+    ALLOCATE_EMPTY_EXTERNAL_ARRAY(Double, double)
+    ALLOCATE_EMPTY_EXTERNAL_ARRAY(Pixel, pixel)
+#undef ALLOCATE_EMPTY_EXTERNAL_ARRAY
   }
-  external_map->set_is_extensible(false);
-  set_external_map(external_map);
-
   ASSERT(!InNewSpace(empty_fixed_array()));
   return true;
 }
@@ -3771,6 +3636,39 @@ Heap::RootListIndex Heap::RootIndexForExternalArrayType(
 }
 
 
+Map* Heap::MapForFixedTypedArray(ExternalArrayType array_type) {
+  return Map::cast(roots_[RootIndexForFixedTypedArray(array_type)]);
+}
+
+
+Heap::RootListIndex Heap::RootIndexForFixedTypedArray(
+    ExternalArrayType array_type) {
+  switch (array_type) {
+    case kExternalByteArray:
+      return kFixedInt8ArrayMapRootIndex;
+    case kExternalUnsignedByteArray:
+      return kFixedUint8ArrayMapRootIndex;
+    case kExternalShortArray:
+      return kFixedInt16ArrayMapRootIndex;
+    case kExternalUnsignedShortArray:
+      return kFixedUint16ArrayMapRootIndex;
+    case kExternalIntArray:
+      return kFixedInt32ArrayMapRootIndex;
+    case kExternalUnsignedIntArray:
+      return kFixedUint32ArrayMapRootIndex;
+    case kExternalFloatArray:
+      return kFixedFloat32ArrayMapRootIndex;
+    case kExternalDoubleArray:
+      return kFixedFloat64ArrayMapRootIndex;
+    case kExternalPixelArray:
+      return kFixedUint8ClampedArrayMapRootIndex;
+    default:
+      UNREACHABLE();
+      return kUndefinedValueRootIndex;
+  }
+}
+
+
 Heap::RootListIndex Heap::RootIndexForEmptyExternalArray(
     ElementsKind elementsKind) {
   switch (elementsKind) {
@@ -4029,6 +3927,84 @@ MaybeObject* Heap::AllocateExternalArray(int length,
   return result;
 }
 
+static void ForFixedTypedArray(ExternalArrayType array_type,
+                               int* element_size,
+                               ElementsKind* element_kind) {
+  switch (array_type) {
+    case kExternalUnsignedByteArray:
+      *element_size = 1;
+      *element_kind = UINT8_ELEMENTS;
+      return;
+    case kExternalByteArray:
+      *element_size = 1;
+      *element_kind = INT8_ELEMENTS;
+      return;
+    case kExternalUnsignedShortArray:
+      *element_size = 2;
+      *element_kind = UINT16_ELEMENTS;
+      return;
+    case kExternalShortArray:
+      *element_size = 2;
+      *element_kind = INT16_ELEMENTS;
+      return;
+    case kExternalUnsignedIntArray:
+      *element_size = 4;
+      *element_kind = UINT32_ELEMENTS;
+      return;
+    case kExternalIntArray:
+      *element_size = 4;
+      *element_kind = INT32_ELEMENTS;
+      return;
+    case kExternalFloatArray:
+      *element_size = 4;
+      *element_kind = FLOAT32_ELEMENTS;
+      return;
+    case kExternalDoubleArray:
+      *element_size = 8;
+      *element_kind = FLOAT64_ELEMENTS;
+      return;
+    case kExternalPixelArray:
+      *element_size = 1;
+      *element_kind = UINT8_CLAMPED_ELEMENTS;
+      return;
+    default:
+      *element_size = 0;  // Bogus
+      *element_kind = UINT8_ELEMENTS;  // Bogus
+      UNREACHABLE();
+  }
+}
+
+
+MaybeObject* Heap::AllocateFixedTypedArray(int length,
+                                           ExternalArrayType array_type,
+                                           PretenureFlag pretenure) {
+  int element_size;
+  ElementsKind elements_kind;
+  ForFixedTypedArray(array_type, &element_size, &elements_kind);
+  int size = OBJECT_POINTER_ALIGN(
+      length * element_size + FixedTypedArrayBase::kDataOffset);
+#ifndef V8_HOST_ARCH_64_BIT
+  if (array_type == kExternalDoubleArray) {
+    size += kPointerSize;
+  }
+#endif
+  AllocationSpace space = SelectSpace(size, OLD_DATA_SPACE, pretenure);
+
+  HeapObject* object;
+  MaybeObject* maybe_object = AllocateRaw(size, space, OLD_DATA_SPACE);
+  if (!maybe_object->To(&object)) return maybe_object;
+
+  if (array_type == kExternalDoubleArray) {
+    object = EnsureDoubleAligned(this, object, size);
+  }
+
+  FixedTypedArrayBase* elements =
+      reinterpret_cast<FixedTypedArrayBase*>(object);
+  elements->set_map(MapForFixedTypedArray(array_type));
+  elements->set_length(length);
+  return elements;
+}
+
 
 MaybeObject* Heap::CreateCode(const CodeDesc& desc,
                               Code::Flags flags,
@@ -6822,6 +6798,10 @@ void Heap::EnsureWeakObjectToCodeTable() {
 }
 
 
+void Heap::FatalProcessOutOfMemory(const char* location, bool take_snapshot) {
+  v8::internal::V8::FatalProcessOutOfMemory(location, take_snapshot);
+}
+
 #ifdef DEBUG
 
 class PrintHandleVisitor: public ObjectVisitor {