arrange to create prototypes for generators

src/generator.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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-// Flags: --allow-natives-syntax
-// Test expressions that can be computed with a multiply-add instruction.
+// 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 f(a, b, c) {
-  return a - b * c;
+function GeneratorObjectNext() {
+  // TODO(wingo): Implement.
 }
 
-function g(a, b, c) {
-  return a * b - c;
+function GeneratorObjectSend(value) {
+  // TODO(wingo): Implement.
 }
 
-function h(a, b, c, d) {
-  return a * b - c * d;
+function GeneratorObjectThrow(exn) {
+  // TODO(wingo): Implement.
 }
 
-assertEquals(-5.41, f(1.1, 2.1, 3.1));
-assertEquals(-5.41, f(1.1, 2.1, 3.1));
-%OptimizeFunctionOnNextCall(f);
-assertEquals(-5.41, f(1.1, 2.1, 3.1));
+function GeneratorObjectClose() {
+  // TODO(wingo): Implement.
+}
 
-assertEquals(8.36, g(2.2, 3.3, -1.1));
-assertEquals(8.36, g(2.2, 3.3, -1.1));
-%OptimizeFunctionOnNextCall(g);
-assertEquals(8.36, g(2.2, 3.3, -1.1));
+function SetUpGenerators() {
+  %CheckIsBootstrapping();
+  var GeneratorObjectPrototype = GeneratorFunctionPrototype.prototype;
+  InstallFunctions(GeneratorObjectPrototype,
+                   DONT_ENUM | DONT_DELETE | READ_ONLY,
+                   ["next", GeneratorObjectNext,
+                    "send", GeneratorObjectSend,
+                    "throw", GeneratorObjectThrow,
+                    "close", GeneratorObjectClose]);
+}
 
-assertEquals(-1.5, h(1.5, 3.0, 12, 0.5));
-assertEquals(-1.5, h(1.5, 3.0, 12, 0.5));
-%OptimizeFunctionOnNextCall(h);
-assertEquals(-1.5, h(1.5, 3.0, 12, 0.5));
+SetUpGenerators();