Added an extra flag that enables only ArrayBuffer.

src/arraybuffer.js

Index: src/arraybuffer.js
diff --git a/src/generator.js b/src/arraybuffer.js
similarity index 51%
copy from src/generator.js
copy to src/arraybuffer.js
index 5e61091565567bf9d516a45d0efd72add6aa33af..2b0c3dd85b1107bc2f5a98d355a24ad7a974e9fe 100644
--- a/src/generator.js
+++ b/src/arraybuffer.js
@@ -27,58 +27,74 @@
 
 "use strict";
 
-// This file relies on the fact that the following declarations have been made
-// in runtime.js:
-// var $Function = global.Function;
+var $ArrayBuffer = global.ArrayBuffer;
 
-// ----------------------------------------------------------------------------
+// -------------------------------------------------------------------
 
-
-// TODO(wingo): Give link to specification. For now, the following diagram is
-// the spec:
-// http://wiki.ecmascript.org/lib/exe/fetch.php?cache=cache&media=harmony:es6_generator_object_model_3-29-13.png
-
-function GeneratorObjectNext() {
-  if (!IS_GENERATOR(this)) {
-    throw MakeTypeError('incompatible_method_receiver',
-                        ['[Generator].prototype.next', this]);
+function ArrayBufferConstructor(byteLength) { // length = 1
+  if (%_IsConstructCall()) {
+    var l = TO_POSITIVE_INTEGER(byteLength);
+    %ArrayBufferInitialize(this, l);
+  } else {
+    return new $ArrayBuffer(byteLength);
   }
-
-  return %_GeneratorSend(this, void 0);
 }
 
-function GeneratorObjectSend(value) {
-  if (!IS_GENERATOR(this)) {
+function ArrayBufferGetByteLength() {
+  if (!IS_ARRAYBUFFER(this)) {
     throw MakeTypeError('incompatible_method_receiver',
-                        ['[Generator].prototype.send', this]);
+                        ['ArrayBuffer.prototype.byteLength', this]);
   }
-
-  return %_GeneratorSend(this, value);
+  return %ArrayBufferGetByteLength(this);
 }
 
-function GeneratorObjectThrow(exn) {
-  if (!IS_GENERATOR(this)) {
+// ES6 Draft 15.13.5.5.3
+function ArrayBufferSlice(start, end) {
+  if (!IS_ARRAYBUFFER(this)) {
     throw MakeTypeError('incompatible_method_receiver',
-                        ['[Generator].prototype.throw', this]);
+                        ['ArrayBuffer.prototype.slice', this]);
+  }
+
+  var relativeStart = TO_INTEGER(start);
+  var first;
+  if (relativeStart < 0) {
+    first = MathMax(this.byteLength + relativeStart, 0);
+  } else {
+    first = MathMin(relativeStart, this.byteLength);
+  }
+  var relativeEnd = IS_UNDEFINED(end) ? this.byteLength : TO_INTEGER(end);
+  var fin;
+  if (relativeEnd < 0) {
+    fin = MathMax(this.byteLength + relativeEnd, 0);
+  } else {
+    fin = MathMin(relativeEnd, this.byteLength);
   }
 
-  return %_GeneratorThrow(this, exn);
+  var newLen = fin - first;
+  // TODO(dslomov): implement inheritance
+  var result = new $ArrayBuffer(newLen);
+
+  %ArrayBufferSliceImpl(this, result, first);
+  return result;
 }
 
-function SetUpGenerators() {
+function SetUpArrayBuffer() {
   %CheckIsBootstrapping();
-  var GeneratorObjectPrototype = GeneratorFunctionPrototype.prototype;
-  InstallFunctions(GeneratorObjectPrototype,
-                   DONT_ENUM | DONT_DELETE | READ_ONLY,
-                   ["next", GeneratorObjectNext,
-                    "send", GeneratorObjectSend,
-                    "throw", GeneratorObjectThrow]);
-  %SetProperty(GeneratorObjectPrototype, "constructor",
-               GeneratorFunctionPrototype, DONT_ENUM | DONT_DELETE | READ_ONLY);
-  %SetPrototype(GeneratorFunctionPrototype, $Function.prototype);
-  %SetProperty(GeneratorFunctionPrototype, "constructor",
-               GeneratorFunction, DONT_ENUM | DONT_DELETE | READ_ONLY);
-  %SetPrototype(GeneratorFunction, $Function);
+
+  // Set up the ArrayBuffer constructor function.
+  %SetCode($ArrayBuffer, ArrayBufferConstructor);
+  %FunctionSetPrototype($ArrayBuffer, new $Object());
+
+  // Set up the constructor property on the ArrayBuffer prototype object.
+  %SetProperty($ArrayBuffer.prototype, "constructor", $ArrayBuffer, DONT_ENUM);
+
+  InstallGetter($ArrayBuffer.prototype, "byteLength", ArrayBufferGetByteLength);
+
+  InstallFunctions($ArrayBuffer.prototype, DONT_ENUM, $Array(
+      "slice", ArrayBufferSlice
+  ));
 }
 
-SetUpGenerators();
+SetUpArrayBuffer();
+
+