Introduce await

runtime/vm/flow_graph_builder.cc

 // 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.
 
 #include "vm/flow_graph_builder.h"
 
 #include "lib/invocation_mirror.h"
 #include "vm/ast_printer.h"
 #include "vm/bit_vector.h"
 #include "vm/class_finalizer.h"
@@ skipping 2096 matching lines @@
   ASSERT(jump_target != NULL);
   Goto(jump_target);
 }
 
 
 void EffectGraphVisitor::VisitArgumentListNode(ArgumentListNode* node) {
   UNREACHABLE();
 }
 
 
+void EffectGraphVisitor::VisitAwaitNode(AwaitNode* node) {
+  // Await nodes are temporary during parsing.
+  UNREACHABLE();
+}
+
+
 intptr_t EffectGraphVisitor::GetCurrentTempLocalIndex() const {
   return kFirstLocalSlotFromFp
       - owner()->num_stack_locals()
       - owner()->num_copied_params()
       - owner()->args_pushed()
       - owner()->temp_count() + 1;
 }
 
 
 LocalVariable* EffectGraphVisitor::EnterTempLocalScope(Value* value) {
@@ skipping 1866 matching lines @@
   Report::MessageF(Report::kBailout,
                    Script::Handle(function.script()),
                    function.token_pos(),
                    "FlowGraphBuilder Bailout: %s %s",
                    String::Handle(function.name()).ToCString(),
                    reason);
   UNREACHABLE();
 }
 
 }  // namespace dart