Optimize GetPrototype

src/array.js

 // 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.
 
 "use strict";
 
 // This file relies on the fact that the following declarations have been made
 // in runtime.js:
 // var $Array = global.Array;
 
@@ skipping 966 matching lines @@
         from = high_start;
       }
     }
   };
 
   // Copy elements in the range 0..length from obj's prototype chain
   // to obj itself, if obj has holes. Return one more than the maximal index
   // of a prototype property.
   var CopyFromPrototype = function CopyFromPrototype(obj, length) {
     var max = 0;
-    for (var proto = %GetPrototype(obj); proto; proto = %GetPrototype(proto)) {
+    for (var proto = %_GetPrototype(obj); proto; proto = %_GetPrototype(proto)) {
       var indices = %GetArrayKeys(proto, length);
       if (IS_NUMBER(indices)) {
         // It's an interval.
         var proto_length = indices;
         for (var i = 0; i < proto_length; i++) {
           if (!HAS_OWN_PROPERTY(obj, i) && HAS_OWN_PROPERTY(proto, i)) {
             obj[i] = proto[i];
             if (i >= max) { max = i + 1; }
           }
         }
       } else {
         for (var i = 0; i < indices.length; i++) {
           var index = indices[i];
           if (!IS_UNDEFINED(index) && !HAS_OWN_PROPERTY(obj, index)
               && HAS_OWN_PROPERTY(proto, index)) {
             obj[index] = proto[index];
             if (index >= max) { max = index + 1; }
           }
         }
       }
     }
     return max;
   };
 
   // Set a value of "undefined" on all indices in the range from..to
   // where a prototype of obj has an element. I.e., shadow all prototype
   // elements in that range.
   var ShadowPrototypeElements = function(obj, from, to) {
-    for (var proto = %GetPrototype(obj); proto; proto = %GetPrototype(proto)) {
+    for (var proto = %_GetPrototype(obj); proto; proto = %_GetPrototype(proto)) {
       var indices = %GetArrayKeys(proto, to);
       if (IS_NUMBER(indices)) {
         // It's an interval.
         var proto_length = indices;
         for (var i = from; i < proto_length; i++) {
           if (HAS_OWN_PROPERTY(proto, i)) {
             obj[i] = UNDEFINED;
           }
         }
       } else {
@@ skipping 47 matching lines @@
     // of defined elements.
     if (!IS_UNDEFINED(obj[first_undefined])) first_undefined++;
     // Fill in the undefineds and the holes.  There may be a hole where
     // an undefined should be and vice versa.
     var i;
     for (i = first_undefined; i < length - num_holes; i++) {
       obj[i] = UNDEFINED;
     }
     for (i = length - num_holes; i < length; i++) {
       // For compatability with Webkit, do not expose elements in the prototype.
-      if (i in %GetPrototype(obj)) {
+      if (i in %_GetPrototype(obj)) {
         obj[i] = UNDEFINED;
       } else {
         delete obj[i];
       }
     }
 
     // Return the number of defined elements.
     return first_undefined;
   };
 
@@ skipping 486 matching lines @@
   ));
 
   SetUpLockedPrototype(InternalPackedArray, $Array(), $Array(
     "join", getFunction("join", ArrayJoin),
     "pop", getFunction("pop", ArrayPop),
     "push", getFunction("push", ArrayPush)
   ));
 }
 
 SetUpArray();