arrange to create prototypes for generators

src/generator.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
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 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-"use strict";
+// This file relies on the fact that the following declarations have been made

[Michael Starzinger, 2013/04/11 18:43:47]

Late drive-by comment: Can we make this file "use strict". Even though it will
take longer to switch all old builtins strict I would advocate for writing new
ones in strict mode.

+//
+// in runtime.js:
+// var $Function = global.Function;
 
-var $Symbol = global.Symbol;
+// ----------------------------------------------------------------------------
 
-function SymbolConstructor(x) {
-  var value =
-    IS_SYMBOL(x) ? x : %CreateSymbol(IS_UNDEFINED(x) ? x : ToString(x));
-  if (%_IsConstructCall()) {
-    %_SetValueOf(this, value);
-  } else {
-    return value;
-  }
+
+// 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() {
+  // TODO(wingo): Implement.
 }
 
-function SymbolGetName() {
-  var symbol = IS_SYMBOL_WRAPPER(this) ? %_ValueOf(this) : this;
-  if (!IS_SYMBOL(symbol)) {
-    throw MakeTypeError(
-        'incompatible_method_receiver', ["Symbol.prototype.name", this]);
-  }
-  return %SymbolName(symbol);
+function GeneratorObjectSend(value) {
+  // TODO(wingo): Implement.
 }
 
-function SymbolToString() {
-  throw MakeTypeError('symbol_to_string');
+function GeneratorObjectThrow(exn) {
+  // TODO(wingo): Implement.
 }
 
-function SymbolValueOf() {
-  // NOTE: Both Symbol objects and values can enter here as
-  // 'this'. This is not as dictated by ECMA-262.
-  if (!IS_SYMBOL(this) && !IS_SYMBOL_WRAPPER(this)) {
-    throw MakeTypeError(
-        'incompatible_method_receiver', ["Symbol.prototype.valueOf", this]);
-  }
-  return %_ValueOf(this);
+function GeneratorObjectClose() {
+  // TODO(wingo): Implement.
 }
 
-//-------------------------------------------------------------------
-
-function SetUpSymbol() {
+function SetUpGenerators() {
   %CheckIsBootstrapping();
-
-  %SetCode($Symbol, SymbolConstructor);
-  %FunctionSetPrototype($Symbol, new $Symbol());
-  %SetProperty($Symbol.prototype, "constructor", $Symbol, DONT_ENUM);
-
-  InstallGetter($Symbol.prototype, "name", SymbolGetName);
-  InstallFunctions($Symbol.prototype, DONT_ENUM, $Array(
-    "toString", SymbolToString,
-    "valueOf", SymbolValueOf
-  ));
+  var GeneratorObjectPrototype = GeneratorFunctionPrototype.prototype;
+  InstallFunctions(GeneratorObjectPrototype,
+                   DONT_ENUM | DONT_DELETE | READ_ONLY,
+                   ["next", GeneratorObjectNext,
+                    "send", GeneratorObjectSend,
+                    "throw", GeneratorObjectThrow,
+                    "close", GeneratorObjectClose]);
+  %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);
 }
 
-SetUpSymbol();
+SetUpGenerators();