Implement ES6 rest parameters

src/hydrogen.cc

 // 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.
 
 #include "src/hydrogen.h"
 
 #include <sstream>
 
 #include "src/v8.h"
 
@@ skipping 4502 matching lines @@
        ++i) {
     environment()->Bind(i, undefined_constant);
   }
 
   // Handle the arguments and arguments shadow variables specially (they do
   // not have declarations).
   if (scope->arguments() != NULL) {
     environment()->Bind(scope->arguments(),
                         graph()->GetArgumentsObject());
   }
+
+  int rest_index;
+  Variable* rest = scope->rest_parameter(&rest_index);
+  if (rest) {
+    return Bailout(kRestParameter);
+  }
 }
 
 
 Type* HOptimizedGraphBuilder::ToType(Handle<Map> map) {
   return IC::MapToType<Type>(map, zone());
 }
 
 
 void HOptimizedGraphBuilder::VisitStatements(ZoneList<Statement*>* statements) {
   for (int i = 0; i < statements->length(); i++) {
@@ skipping 8963 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal