Lookup getter/setter symbols before alllocating them, thus eliminating extra String allocations in …

runtime/vm/symbols.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_SYMBOLS_H_
 #define VM_SYMBOLS_H_
 
 #include "vm/growable_array.h"
 #include "vm/object.h"
 #include "vm/snapshot_ids.h"
@@ skipping 593 matching lines @@
   static const char* Name(SymbolId symbol);
 
   static RawString* FromCharCode(int32_t char_code);
 
   static RawString** PredefinedAddress() {
     return reinterpret_cast<RawString**>(&predefined_);
   }
 
   static void DumpStats();
 
+  // Returns Symbol::Null if no symbol is found.
+  template<typename StringType>
+  static RawString* Lookup(const StringType& str);
+
+  // Returns Symbol::Null if no symbol is found.
+  static RawString* LookupFromConcat(const String& str1, const String& str2);
+
  private:
   enum {
     kInitialVMIsolateSymtabSize = 1024,
     kInitialSymtabSize = 2048
   };
 
   static void GetStats(Isolate* isolate,
                        intptr_t* size,
                        intptr_t* capacity);
 
@@ skipping 20 matching lines @@
   friend class SnapshotReader;
   friend class SnapshotWriter;
   friend class ApiMessageReader;
 
   DISALLOW_COPY_AND_ASSIGN(Symbols);
 };
 
 }  // namespace dart
 
 #endif  // VM_SYMBOLS_H_