In-heap small typed arrays

src/typedarray.js

 // Copyright 2013 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 82 matching lines @@
     %TypedArrayInitialize(obj, ARRAY_ID, buffer, offset, newByteLength);
   }
 
   function NAMEConstructByLength(obj, length) {
     var l = IS_UNDEFINED(length) ?
       0 : ToPositiveInteger(length, "invalid_typed_array_length");
     if (l > %MaxSmi()) {
       throw MakeRangeError("invalid_typed_array_length");
     }
     var byteLength = l * ELEMENT_SIZE;
-    var buffer = new $ArrayBuffer(byteLength);
-    %TypedArrayInitialize(obj, ARRAY_ID, buffer, 0, byteLength);
+    if (byteLength > %TypedArrayMaxSizeInHeap()) {
+      var buffer = new $ArrayBuffer(byteLength);
+      %TypedArrayInitialize(obj, ARRAY_ID, buffer, 0, byteLength);
+    } else {
+      %TypedArrayInitialize(obj, ARRAY_ID, null, 0, byteLength);
+    }
   }
 
   function NAMEConstructByArrayLike(obj, arrayLike) {
     var length = arrayLike.length;
     var l = ToPositiveInteger(length, "invalid_typed_array_length");
 
     if (l > %MaxSmi()) {
       throw MakeRangeError("invalid_typed_array_length");
     }
     if(!%TypedArrayInitializeFromArrayLike(obj, ARRAY_ID, arrayLike, l)) {
@@ skipping 58 matching lines @@
     if (endInt < 0) {
       endInt = MathMax(0, srcLength + endInt);
     } else {
       endInt = MathMin(endInt, srcLength);
     }
     if (endInt < beginInt) {
       endInt = beginInt;
     }
     var newLength = endInt - beginInt;
     var beginByteOffset =
-        %TypedArrayGetByteOffset(this) + beginInt * elementSize;
-    return new constructor(%TypedArrayGetBuffer(this),
+        this.byteOffset + beginInt * elementSize;
+    return new constructor(this.buffer,
                            beginByteOffset, newLength);
   }
 }
 
 function TypedArraySetFromArrayLike(target, source, sourceLength, offset) {
   if (offset > 0) {
     for (var i = 0; i < sourceLength; i++) {
       target[offset + i] = source[i];
     }
   }
@@ skipping 267 matching lines @@
 
       "getFloat32", DataViewGetFloat32,
       "setFloat32", DataViewSetFloat32,
 
       "getFloat64", DataViewGetFloat64,
       "setFloat64", DataViewSetFloat64
   ));
 }
 
 SetupDataView();