Basic array capacity feedback via allocation sites.

src/elements.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/arguments.h"
 #include "src/conversions.h"
 #include "src/elements.h"
 #include "src/objects.h"
@@ skipping 1825 matching lines @@
       if (len > 0 && len < JSObject::kInitialMaxFastElementArray) {
         ElementsKind elements_kind = array->GetElementsKind();
         JSArray::Initialize(array, len, len);
 
         if (!IsFastHoleyElementsKind(elements_kind)) {
           elements_kind = GetHoleyElementsKind(elements_kind);
           JSObject::TransitionElementsKind(array, elements_kind);
         }
         return array;
       } else if (len == 0) {
-        JSArray::Initialize(array, JSArray::kPreallocatedArrayElements);
+        JSArray::Initialize(array, JSArray::PreallocatedArrayElements());
         return array;
       }
     }
 
     // Take the argument as the length.
     JSArray::Initialize(array, 0);
 
     return JSArray::SetElementsLength(array, obj);
   }
 
   // Optimize the case where there are no parameters passed.
   if (args->length() == 0) {
-    JSArray::Initialize(array, JSArray::kPreallocatedArrayElements);
+    JSArray::Initialize(array, JSArray::PreallocatedArrayElements());
     return array;
   }
 
   Factory* factory = array->GetIsolate()->factory();
 
   // Set length and elements on the array.
   int number_of_elements = args->length();
   JSObject::EnsureCanContainElements(
       array, args, 0, number_of_elements, ALLOW_CONVERTED_DOUBLE_ELEMENTS);
 
@@ skipping 41 matching lines @@
       UNREACHABLE();
       break;
   }
 
   array->set_elements(*elms);
   array->set_length(Smi::FromInt(number_of_elements));
   return array;
 }
 
 } }  // namespace v8::internal