In-heap small typed arrays

src/heap.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 146 matching lines @@
       EmptyExternalUint8ClampedArray)                                          \
   V(Map, fixed_uint8_array_map, FixedUint8ArrayMap)                            \
   V(Map, fixed_int8_array_map, FixedInt8ArrayMap)                              \
   V(Map, fixed_uint16_array_map, FixedUint16ArrayMap)                          \
   V(Map, fixed_int16_array_map, FixedInt16ArrayMap)                            \
   V(Map, fixed_uint32_array_map, FixedUint32ArrayMap)                          \
   V(Map, fixed_int32_array_map, FixedInt32ArrayMap)                            \
   V(Map, fixed_float32_array_map, FixedFloat32ArrayMap)                        \
   V(Map, fixed_float64_array_map, FixedFloat64ArrayMap)                        \
   V(Map, fixed_uint8_clamped_array_map, FixedUint8ClampedArrayMap)             \
+  V(FixedTypedArrayBase, empty_fixed_uint8_array, EmptyFixedUint8Array)        \
+  V(FixedTypedArrayBase, empty_fixed_int8_array, EmptyFixedInt8Array)          \
+  V(FixedTypedArrayBase, empty_fixed_uint16_array, EmptyFixedUint16Array)      \
+  V(FixedTypedArrayBase, empty_fixed_int16_array, EmptyFixedInt16Array)        \
+  V(FixedTypedArrayBase, empty_fixed_uint32_array, EmptyFixedUint32Array)      \
+  V(FixedTypedArrayBase, empty_fixed_int32_array, EmptyFixedInt32Array)        \
+  V(FixedTypedArrayBase, empty_fixed_float32_array, EmptyFixedFloat32Array)    \
+  V(FixedTypedArrayBase, empty_fixed_float64_array, EmptyFixedFloat64Array)    \
+  V(FixedTypedArrayBase, empty_fixed_uint8_clamped_array,                      \
+      EmptyFixedUint8ClampedArray)                                             \
   V(Map, sloppy_arguments_elements_map, SloppyArgumentsElementsMap)            \
   V(Map, function_context_map, FunctionContextMap)                             \
   V(Map, catch_context_map, CatchContextMap)                                   \
   V(Map, with_context_map, WithContextMap)                                     \
   V(Map, block_context_map, BlockContextMap)                                   \
   V(Map, module_context_map, ModuleContextMap)                                 \
   V(Map, global_context_map, GlobalContextMap)                                 \
   V(Map, oddball_map, OddballMap)                                              \
   V(Map, message_object_map, JSMessageObjectMap)                               \
   V(Map, foreign_map, ForeignMap)                                              \
@@ skipping 1464 matching lines @@
 
   Map* MapForFixedTypedArray(ExternalArrayType array_type);
   RootListIndex RootIndexForFixedTypedArray(
       ExternalArrayType array_type);
 
   Map* MapForExternalArrayType(ExternalArrayType array_type);
   RootListIndex RootIndexForExternalArrayType(
       ExternalArrayType array_type);
 
   RootListIndex RootIndexForEmptyExternalArray(ElementsKind kind);
+  RootListIndex RootIndexForEmptyFixedTypedArray(ElementsKind kind);
   ExternalArray* EmptyExternalArrayForMap(Map* map);
+  FixedTypedArrayBase* EmptyFixedTypedArrayForMap(Map* map);
 
   void RecordStats(HeapStats* stats, bool take_snapshot = false);
 
   // Copy block of memory from src to dst. Size of block should be aligned
   // by pointer size.
   static inline void CopyBlock(Address dst, Address src, int byte_size);
 
   // Optimized version of memmove for blocks with pointer size aligned sizes and
   // pointer size aligned addresses.
   static inline void MoveBlock(Address dst, Address src, int byte_size);
@@ skipping 549 matching lines @@
       ElementsKind elements_kind,
       PretenureFlag pretenure = NOT_TENURED);
 
   // Allocate empty fixed array.
   MUST_USE_RESULT MaybeObject* AllocateEmptyFixedArray();
 
   // Allocate empty external array of given type.
   MUST_USE_RESULT MaybeObject* AllocateEmptyExternalArray(
       ExternalArrayType array_type);
 
+  // Allocate empty fixed typed array of given type.
+  MUST_USE_RESULT MaybeObject* AllocateEmptyFixedTypedArray(
+      ExternalArrayType array_type);
+
   // Allocate empty fixed double array.
   MUST_USE_RESULT MaybeObject* AllocateEmptyFixedDoubleArray();
 
   // Allocate empty constant pool array.
   MUST_USE_RESULT MaybeObject* AllocateEmptyConstantPoolArray();
 
   // Allocate a tenured simple cell.
   MUST_USE_RESULT MaybeObject* AllocateCell(Object* value);
 
   // Allocate a tenured JS global property cell initialized with the hole.
@@ skipping 892 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_