Implement async* functions in VM

runtime/vm/object.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 2134 matching lines @@
   // Returns true if this function represents a local function.
   bool IsLocalFunction() const {
     return parent_function() != Function::null();
   }
 
   // Returns true if this function represents a signature function without code.
   bool IsSignatureFunction() const {
     return kind() == RawFunction::kSignatureFunction;
   }
 
   bool IsAsyncFunction() const {

[Ivan Posva, 2015/03/03 01:05:52]

Can you please comment what these different function checkers test for? For
example in which case does IsGenerator() return true?

     return modifier() == RawFunction::kAsync;
   }
 
   bool IsAsyncClosure() const {
     return is_generated_body() &&
         Function::Handle(parent_function()).IsAsyncFunction();
   }
 
   bool IsGenerator() const {
     return (modifier() & RawFunction::kGeneratorBit) != 0;
   }
 
   bool IsSyncGenerator() const {
     return modifier() == RawFunction::kSyncGen;
   }
 
   bool IsSyncGenClosure() const {
     return is_generated_body() &&
         Function::Handle(parent_function()).IsSyncGenerator();
   }
 
+  bool IsGeneratorClosure() const {
+    return is_generated_body() &&
+        Function::Handle(parent_function()).IsGenerator();
+  }
+
+  bool IsAsyncGenerator() const {
+    return modifier() == RawFunction::kAsyncGen;
+  }
+
+  bool IsAsyncGenClosure() const {
+    return is_generated_body() &&
+        Function::Handle(parent_function()).IsAsyncGenerator();
+  }
+
   bool IsAsyncOrGenerator() const {
     return modifier() != RawFunction::kNoModifier;
   }
 
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawFunction));
   }
 
   static RawFunction* New(const String& name,
                           RawFunction::Kind kind,
@@ skipping 5620 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_