Avoid unnecessary copying when parsing doubles.

runtime/vm/object.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_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include <limits>
 #include "include/dart_api.h"
 #include "platform/assert.h"
@@ skipping 5477 matching lines @@
   static RawString* IdentifierPrettyName(const String& name);
   static RawString* IdentifierPrettyNameRetainPrivate(const String& name);
 
   static bool EqualsIgnoringPrivateKey(const String& str1,
                                        const String& str2);
 
   static RawString* NewFormatted(const char* format, ...)
       PRINTF_ATTRIBUTE(1, 2);
   static RawString* NewFormattedV(const char* format, va_list args);
 
+  static bool ParseDouble(const String& str,
+                          intptr_t start,
+                          intptr_t end,
+                          double* result);
+
  protected:
   bool HasHash() const {
     ASSERT(Smi::New(0) == NULL);
     return (raw_ptr()->hash_ != NULL);
   }
 
   void SetLength(intptr_t value) const {
     // This is only safe because we create a new Smi, which does not cause
     // heap allocation.
     raw_ptr()->length_ = Smi::New(value);
@@ skipping 1629 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_