Introduce await

runtime/vm/ast.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_AST_H_
 #define VM_AST_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/growable_array.h"
 #include "vm/scopes.h"
 #include "vm/object.h"
 #include "vm/native_entry.h"
 #include "vm/token.h"
 
 namespace dart {
 
 #define FOR_EACH_NODE(V)                                                       \
+  V(Await)                                                                     \
   V(Return)                                                                    \
   V(Literal)                                                                   \
   V(Type)                                                                      \
   V(Assignable)                                                                \
   V(BinaryOp)                                                                  \
   V(BinaryOpWithMask32)                                                        \
   V(Comparison)                                                                \
   V(UnaryOp)                                                                   \
   V(ConditionalExpr)                                                           \
   V(If)                                                                        \
@@ skipping 110 matching lines @@
 
  protected:
   friend class ParsedFunction;
 
  private:
   const intptr_t token_pos_;
   DISALLOW_COPY_AND_ASSIGN(AstNode);
 };
 
 
+class AwaitNode : public AstNode {
+ public:
+  AwaitNode(intptr_t token_pos, AstNode* expr)
+    : AstNode(token_pos), expr_(expr) { }
+
+  void VisitChildren(AstNodeVisitor* visitor) const {
+    expr_->Visit(visitor);
+  }
+
+  AstNode* expr() const { return expr_; }
+
+  DECLARE_COMMON_NODE_FUNCTIONS(AwaitNode);
+
+ private:
+  AstNode* expr_;
+
+  DISALLOW_COPY_AND_ASSIGN(AwaitNode);
+};
+
+
 class SequenceNode : public AstNode {
  public:
   SequenceNode(intptr_t token_pos, LocalScope* scope)
     : AstNode(token_pos),
       scope_(scope),
       nodes_(4),
       label_(NULL) {
   }
 
   LocalScope* scope() const { return scope_; }
@@ skipping 1647 matching lines @@
   const intptr_t try_index_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(InlinedFinallyNode);
 };
 
 }  // namespace dart
 
 #undef DECLARE_COMMON_NODE_FUNCTIONS
 
 #endif  // VM_AST_H_