null-aware operators in the VM

runtime/vm/ast_transformer.cc

 // Copyright (c) 2014, 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/ast_transformer.h"
 
 #include "vm/object_store.h"
 #include "vm/parser.h"
 #include "vm/thread.h"
 
@@ skipping 418 matching lines @@
 
 
 void AwaitTransformer::VisitInstanceCallNode(InstanceCallNode* node) {
   AstNode* new_receiver = Transform(node->receiver());
   ArgumentListNode* new_args =
       Transform(node->arguments())->AsArgumentListNode();
   LocalVariable* result = AddToPreambleNewTempVar(
       new(Z) InstanceCallNode(node->token_pos(),
                               new_receiver,
                               node->function_name(),
-                              new_args));
+                              new_args,
+                              node->is_conditional()));
   result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
 }
 
 
 void AwaitTransformer::VisitStaticCallNode(StaticCallNode* node) {
   ArgumentListNode* new_args =
       Transform(node->arguments())->AsArgumentListNode();
   LocalVariable* result = AddToPreambleNewTempVar(
       new(Z) StaticCallNode(node->token_pos(),
                             node->function(),
@@ skipping 12 matching lines @@
                                  new_args));
   result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
 }
 
 
 void AwaitTransformer::VisitInstanceGetterNode(InstanceGetterNode* node) {
   AstNode* new_receiver = Transform(node->receiver());
   LocalVariable* result = AddToPreambleNewTempVar(
       new(Z) InstanceGetterNode(node->token_pos(),
                                 new_receiver,
-                                node->field_name()));
+                                node->field_name(),
+                                node->is_conditional()));
   result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
 }
 
 
 void AwaitTransformer::VisitInstanceSetterNode(InstanceSetterNode* node) {
   AstNode* new_receiver = node->receiver();
   if (new_receiver != NULL) {
     new_receiver = Transform(new_receiver);
   }
   AstNode* new_value = Transform(node->value());
   LocalVariable* result = AddToPreambleNewTempVar(
       new(Z) InstanceSetterNode(node->token_pos(),
                                 new_receiver,
                                 node->field_name(),
-                                new_value));
+                                new_value,
+                                node->is_conditional()));
   result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
 }
 
 
 void AwaitTransformer::VisitStaticGetterNode(StaticGetterNode* node) {
   AstNode* new_receiver = node->receiver();
   if (new_receiver != NULL) {
     new_receiver = Transform(new_receiver);
   }
   StaticGetterNode* new_getter =
@@ skipping 115 matching lines @@
 
 
 void AwaitTransformer::VisitThrowNode(ThrowNode* node) {
   AstNode* new_exception = Transform(node->exception());
   result_ = new(Z) ThrowNode(node->token_pos(),
                              new_exception,
                              node->stacktrace());
 }
 
 }  // namespace dart