[builtins] Migrate the DataView constructor to C++.

src/js/typedarray.js

 // Copyright 2013 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.
 
 (function(global, utils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
@@ skipping 829 matching lines @@
                     READ_ONLY | DONT_ENUM | DONT_DELETE);
   // TODO(littledan): Remove this performance workaround BUG(chromium:579905)
   utils.InstallGetter(GlobalNAME.prototype, "length", NAME_GetLength,
                       DONT_ENUM | DONT_DELETE);
 endmacro
 
 TYPED_ARRAYS(SETUP_TYPED_ARRAY)
 
 // --------------------------- DataView -----------------------------
 
-function DataViewConstructor(buffer, byteOffset, byteLength) { // length = 3
-  if (IS_UNDEFINED(new.target)) {
-    throw MakeTypeError(kConstructorNotFunction, "DataView");
-  }
-
-  // TODO(binji): support SharedArrayBuffers?
-  if (!IS_ARRAYBUFFER(buffer)) throw MakeTypeError(kDataViewNotArrayBuffer);
-  if (!IS_UNDEFINED(byteOffset)) {
-    byteOffset = ToPositiveInteger(byteOffset, kInvalidDataViewOffset);
-  }
-  if (!IS_UNDEFINED(byteLength)) {
-    byteLength = TO_INTEGER(byteLength);
-  }
-
-  var bufferByteLength = %_ArrayBufferGetByteLength(buffer);
-
-  var offset = IS_UNDEFINED(byteOffset) ?  0 : byteOffset;
-  if (offset > bufferByteLength) throw MakeRangeError(kInvalidDataViewOffset);
-
-  var length = IS_UNDEFINED(byteLength)
-      ? bufferByteLength - offset
-      : byteLength;
-  if (length < 0 || offset + length > bufferByteLength) {
-    throw new MakeRangeError(kInvalidDataViewLength);
-  }
-  var result = %NewObject(GlobalDataView, new.target);
-  %_DataViewInitialize(result, buffer, offset, length);
-  return result;
-}
-
 function DataViewGetBufferJS() {
   if (!IS_DATAVIEW(this)) {
     throw MakeTypeError(kIncompatibleMethodReceiver, 'DataView.buffer', this);
   }
   return %DataViewGetBuffer(this);
 }
 
 function DataViewGetByteOffset() {
   if (!IS_DATAVIEW(this)) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
@@ skipping 42 matching lines @@
   if (arguments.length < 2) throw MakeTypeError(kInvalidArgument);
   offset = ToPositiveInteger(offset, kInvalidDataViewAccessorOffset);
   %DataViewSetTYPENAME(this, offset, TO_NUMBER(value), !!little_endian);
 }
 %FunctionSetLength(DataViewSetTYPENAMEJS, 2);
 endmacro
 
 DATA_VIEW_TYPES(DATA_VIEW_GETTER_SETTER)
 
 // Setup the DataView constructor.
-%SetCode(GlobalDataView, DataViewConstructor);
 %FunctionSetPrototype(GlobalDataView, new GlobalObject);
 
 // Set up constructor property on the DataView prototype.
 %AddNamedProperty(GlobalDataView.prototype, "constructor", GlobalDataView,
                   DONT_ENUM);
 %AddNamedProperty(GlobalDataView.prototype, toStringTagSymbol, "DataView",
                   READ_ONLY|DONT_ENUM);
 
 utils.InstallGetter(GlobalDataView.prototype, "buffer", DataViewGetBufferJS);
 utils.InstallGetter(GlobalDataView.prototype, "byteOffset",
@@ skipping 21 matching lines @@
   "setUint32", DataViewSetUint32JS,
 
   "getFloat32", DataViewGetFloat32JS,
   "setFloat32", DataViewSetFloat32JS,
 
   "getFloat64", DataViewGetFloat64JS,
   "setFloat64", DataViewSetFloat64JS
 ]);
 
 })