Add %TypedArray% to proto chain

test/mjsunit/harmony/typedarrays.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 103 matching lines @@
   TestSlice(10, 100, 0.01, 10.96);
 
   TestSlice(10, 100, 90);
   TestSlice(10, 100, -10);
 }
 
 TestArrayBufferSlice();
 
 // Typed arrays
 
+function GetPropertyDescriptor(object, field) {

[adamk, 2015/06/13 00:49:38]

And here.

Maybe I'm missing something as to why the callers weren't just changed to
.__proto__?

+  var descriptor;
+  while (descriptor === undefined && object !== Object.prototype) {
+    descriptor = Object.getOwnPropertyDescriptor(object, field);
+    object = object.__proto__;
+  }
+  return descriptor;
+}
+
 function TestTypedArray(constr, elementSize, typicalElement) {
   assertSame(elementSize, constr.BYTES_PER_ELEMENT);
 
   var ab = new ArrayBuffer(256*elementSize);
 
   var a0 = new constr(30);
   assertEquals("[object " + constr.name + "]",
       Object.prototype.toString.call(a0));
 
   assertTrue(ArrayBuffer.isView(a0));
@@ skipping 128 matching lines @@
 
   var aNoParam = new constr();
   assertSame(elementSize, aNoParam.BYTES_PER_ELEMENT);
   assertSame(0, aNoParam.length);
   assertSame(0, aNoParam.byteLength);
   assertSame(0, aNoParam.byteOffset);
 
   var a = new constr(ab, 64*elementSize, 128);
   assertEquals("[object " + constr.name + "]",
       Object.prototype.toString.call(a));
-  var desc = Object.getOwnPropertyDescriptor(
-      constr.prototype, Symbol.toStringTag);
+  var desc = GetPropertyDescriptor(constr.prototype, Symbol.toStringTag);
   assertTrue(desc.configurable);
   assertFalse(desc.enumerable);
   assertFalse(!!desc.writable);
   assertFalse(!!desc.set);
   assertEquals("function", typeof desc.get);
 }
 
 TestTypedArray(Uint8Array, 1, 0xFF);
 TestTypedArray(Int8Array, 1, -0x7F);
 TestTypedArray(Uint16Array, 2, 0xFFFF);
@@ skipping 89 matching lines @@
   Uint16Array,
   Int16Array,
   Uint32Array,
   Int32Array,
   Uint8ClampedArray,
   Float32Array,
   Float64Array];
 
 function TestPropertyTypeChecks(constructor) {
   function CheckProperty(name) {
-    var d = Object.getOwnPropertyDescriptor(constructor.prototype, name);
+    var d = GetPropertyDescriptor(constructor.prototype, name);
     var o = {};
     assertThrows(function() {d.get.call(o);}, TypeError);
     for (var i = 0; i < typedArrayConstructors.length; i++) {
       var ctor = typedArrayConstructors[i];
       var a = new ctor(10);
-      if (ctor === constructor) {
-        d.get.call(a); // shouldn't throw
-      } else {
-        assertThrows(function() {d.get.call(a);}, TypeError);
-      }
+      d.get.call(a); // shouldn't throw, even from a different type
     }
   }
 
   CheckProperty("buffer");
   CheckProperty("byteOffset");
   CheckProperty("byteLength");
   CheckProperty("length");
 }
 
 for(i = 0; i < typedArrayConstructors.length; i++) {
@@ skipping 308 matching lines @@
 TestArbitrary(new ArrayBuffer(256));
 for(i = 0; i < typedArrayConstructors.length; i++) {
   TestArbitrary(new typedArrayConstructors[i](10));
 }
 TestArbitrary(new DataView(new ArrayBuffer(256)));
 
 
 // Test direct constructor call
 assertThrows(function() { ArrayBuffer(); }, TypeError);
 assertThrows(function() { DataView(new ArrayBuffer()); }, TypeError);