Add usage and collision details to the hash table data structure in order to determine effectivenes…

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 "vm/flags.h"
 
 #ifndef DART_PRECOMPILED_RUNTIME
 
 #include "lib/invocation_mirror.h"
@@ skipping 11960 matching lines @@
   ConstantPosKey(const String& url, TokenPosition pos)
       : script_url(url), token_pos(pos) { }
   const String& script_url;
   TokenPosition token_pos;
 };
 
 
 class ConstMapKeyEqualsTraits {
  public:
   static const char* Name() { return "ConstMapKeyEqualsTraits"; }
+  static bool ReportStats() { return false; }
 
   static bool IsMatch(const Object& a, const Object& b) {
     const Array& key1 = Array::Cast(a);
     const Array& key2 = Array::Cast(b);
     // Compare raw strings of script url symbol and raw smi of token positon.
     return (key1.At(0) == key2.At(0)) && (key1.At(1) == key2.At(1));
   }
   static bool IsMatch(const ConstantPosKey& key1, const Object& b) {
     const Array& key2 = Array::Cast(b);
     // Compare raw strings of script url symbol and token positon.
@@ skipping 2487 matching lines @@
     const ArgumentListNode& function_args,
     const LocalVariable* temp_for_last_arg,
     bool is_super_invocation) {
   UNREACHABLE();
   return NULL;
 }
 
 }  // namespace dart
 
 #endif  // DART_PRECOMPILED_RUNTIME