Properly disable ES6 generator support for TurboFan.

R=rossberg@chromium.org
TEST=mjsunit/es6/*

Review URL: https://codereview.chromium.org/551793002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23776 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/generator.js

@@ -57,11 +57,19 @@ function GeneratorFunctionConstructor(arg1) {  // length == 1
 
 function SetUpGenerators() {
   %CheckIsBootstrapping();
+
+  // Both Runtime_GeneratorNext and Runtime_GeneratorThrow are supported by
+  // neither Crankshaft nor TurboFan, disable optimization of wrappers here.
+  %NeverOptimizeFunction(GeneratorObjectNext);
+  %NeverOptimizeFunction(GeneratorObjectThrow);
+
+  // Set up non-enumerable functions on the generator prototype object.
   var GeneratorObjectPrototype = GeneratorFunctionPrototype.prototype;
   InstallFunctions(GeneratorObjectPrototype,
                    DONT_ENUM | DONT_DELETE | READ_ONLY,
                    ["next", GeneratorObjectNext,
                     "throw", GeneratorObjectThrow]);
+
   %FunctionSetName(GeneratorObjectIterator, '[Symbol.iterator]');
   %AddNamedProperty(GeneratorObjectPrototype, symbolIterator,
       GeneratorObjectIterator, DONT_ENUM | DONT_DELETE | READ_ONLY);

src/runtime.cc

@@ -15268,8 +15268,6 @@ RUNTIME_FUNCTION_RETURN_PAIR(Runtime_ForInNext) {
   }
 
 U(IsStringWrapperSafeForDefaultValueOf)
-U(GeneratorNext)
-U(GeneratorThrow)
 U(DebugBreakInOptimizedCode)
 
 #undef U
@@ -15500,6 +15498,18 @@ RUNTIME_FUNCTION(RuntimeReference_FastAsciiArrayJoin) {
 }
 
 
+RUNTIME_FUNCTION(RuntimeReference_GeneratorNext) {
+  UNREACHABLE();  // Optimization disabled in SetUpGenerators().
+  return NULL;
+}
+
+
+RUNTIME_FUNCTION(RuntimeReference_GeneratorThrow) {
+  UNREACHABLE();  // Optimization disabled in SetUpGenerators().
+  return NULL;
+}
+
+
 RUNTIME_FUNCTION(RuntimeReference_ClassOf) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);

test/mjsunit/mjsunit.status

@@ -118,18 +118,6 @@
   'regress/regress-crbug-259300': [PASS, NO_VARIANTS],
   'regress/regress-frame-details-null-receiver': [PASS, NO_VARIANTS],
 
-  # Support for ES6 generators is missing.
-  'regress-3225': [PASS, NO_VARIANTS],
-  'es6/generators-debug-liveedit': [PASS, NO_VARIANTS],
-  'es6/generators-iteration': [PASS, NO_VARIANTS],
-  'es6/generators-parsing': [PASS, NO_VARIANTS],
-  'es6/generators-poisoned-properties': [PASS, NO_VARIANTS],
-  'es6/generators-relocation': [PASS, NO_VARIANTS],
-  'es6/iteration-semantics': [PASS, NO_VARIANTS],
-  'es6/regress/regress-2681': [PASS, NO_VARIANTS],
-  'es6/regress/regress-2691': [PASS, NO_VARIANTS],
-  'es6/regress/regress-3280': [PASS, NO_VARIANTS],
-
   ##############################################################################
   # Too slow in debug mode with --stress-opt mode.
   'compiler/regress-stacktrace-methods': [PASS, ['mode == debug', SKIP]],