Remove allocation in old space ....

runtime/vm/parser.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/parser.h"
 
 #include "lib/invocation_mirror.h"
 #include "platform/utils.h"
 #include "vm/ast_transformer.h"
 #include "vm/bootstrap.h"
@@ skipping 2772 matching lines @@
 
 
 void Parser::ParseConstructorRedirection(const Class& cls,
                                          LocalVariable* receiver) {
   TRACE_PARSER("ParseConstructorRedirection");
   ExpectToken(Token::kCOLON);
   ASSERT(CurrentToken() == Token::kTHIS);
   const intptr_t call_pos = TokenPos();
   ConsumeToken();
   String& ctor_name = String::Handle(Z, cls.Name());
-
-  ctor_name = String::Concat(ctor_name, Symbols::Dot());
+  GrowableHandlePtrArray<const String> pieces(Z, 3);
+  pieces.Add(ctor_name);
+  pieces.Add(Symbols::Dot());
   if (CurrentToken() == Token::kPERIOD) {
     ConsumeToken();
-    ctor_name = String::Concat(ctor_name,
-                               *ExpectIdentifier("constructor name expected"));
+    pieces.Add(*ExpectIdentifier("constructor name expected"));
   }
+  ctor_name = Symbols::FromConcatAll(pieces);
   CheckToken(Token::kLPAREN, "parameter list expected");
 
   ArgumentListNode* arguments = new ArgumentListNode(call_pos);
   // 'this' parameter is the first argument to constructor.
   AstNode* implicit_argument = new LoadLocalNode(call_pos, receiver);
   arguments->Add(implicit_argument);
   // Construction phase parameter is second argument.
   LocalVariable* phase_param = LookupPhaseParameter();
   ASSERT(phase_param != NULL);
   AstNode* phase_argument = new LoadLocalNode(call_pos, phase_param);
@@ skipping 11477 matching lines @@
 void Parser::SkipQualIdent() {
   ASSERT(IsIdentifier());
   ConsumeToken();
   if (CurrentToken() == Token::kPERIOD) {
     ConsumeToken();  // Consume the kPERIOD token.
     ExpectIdentifier("identifier expected after '.'");
   }
 }
 
 }  // namespace dart