[esnext] prototype runtime implementation for async functions

src/isolate.cc

 // Copyright 2012 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/isolate.h"
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
@@ skipping 311 matching lines @@
 static bool IsVisibleInStackTrace(JSFunction* fun,
                                   Object* caller,
                                   Object* receiver,
                                   bool* seen_caller) {
   if ((fun == caller) && !(*seen_caller)) {
     *seen_caller = true;
     return false;
   }
   // Skip all frames until we've seen the caller.
   if (!(*seen_caller)) return false;
+
   // Functions defined in native scripts are not visible unless directly
   // exposed, in which case the native flag is set.
   // The --builtins-in-stack-traces command line flag allows including
   // internal call sites in the stack trace for debugging purposes.
   if (!FLAG_builtins_in_stack_traces && fun->shared()->IsBuiltin()) {
     return fun->shared()->native();
   }
+
+  // Async function wrappers are not visible in stack trace
+  if (IsAsyncFunction(fun->shared()->kind())) return false;

[caitp (gmail), 2016/04/26 22:01:30]

not needed anymore in Option C

+
   return true;
 }
 
 static Handle<FixedArray> MaybeGrow(Isolate* isolate,
                                     Handle<FixedArray> elements,
                                     int cur_position, int new_size) {
   if (new_size > elements->length()) {
     int new_capacity = JSObject::NewElementsCapacity(elements->length());
     Handle<FixedArray> new_elements =
         isolate->factory()->NewFixedArrayWithHoles(new_capacity);
@@ skipping 2630 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8