Setup a peer for read only strings that are not externalized in

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 "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 4564 matching lines @@
   // Copies the string characters into the provided external array
   // and morphs the string object into an external string object.
   // The remaining unused part of the original string object is marked as
   // an Array object or a regular Object so that it can be traversed during
   // garbage collection.
   RawString* MakeExternal(void* array,
                           intptr_t length,
                           void* peer,
                           Dart_PeerFinalizer cback) const;
 
-
   // Creates a new String object from a C string that is assumed to contain
   // UTF-8 encoded characters and '\0' is considered a termination character.
   // TODO(7123) - Rename this to FromCString(....).
   static RawString* New(const char* cstr, Heap::Space space = Heap::kNew);
 
   // Creates a new String object from an array of UTF-8 encoded characters.
   static RawString* FromUTF8(const uint8_t* utf8_array,
                              intptr_t array_len,
                              Heap::Space space = Heap::kNew);
 
@@ skipping 179 matching lines @@
                                      const String& str,
                                      Heap::Space space);
 
   // High performance version of substring for one-byte strings.
   // "str" must be OneByteString.
   static RawOneByteString* SubStringUnchecked(const String& str,
                                               intptr_t begin_index,
                                               intptr_t length,
                                               Heap::Space space);
 
+  static void SetPeer(const String& str,
+                      void* peer,
+                      Dart_PeerFinalizer cback);
+
+  static void Finalize(Dart_WeakPersistentHandle handle, void* peer);
+
   static const ClassId kClassId = kOneByteStringCid;
 
   static RawOneByteString* null() {
     return reinterpret_cast<RawOneByteString*>(Object::null());
   }
 
  private:
   static RawOneByteString* raw(const String& str) {
     return reinterpret_cast<RawOneByteString*>(str.raw());
   }
@@ skipping 62 matching lines @@
                                   const String& str2,
                                   Heap::Space space);
   static RawTwoByteString* ConcatAll(const Array& strings,
                                      intptr_t len,
                                      Heap::Space space);
 
   static RawTwoByteString* Transform(int32_t (*mapping)(int32_t ch),
                                      const String& str,
                                      Heap::Space space);
 
+  static void SetPeer(const String& str,
+                      void* peer,
+                      Dart_PeerFinalizer cback);
+
+  static void Finalize(Dart_WeakPersistentHandle handle, void* peer);
+
   static RawTwoByteString* null() {
     return reinterpret_cast<RawTwoByteString*>(Object::null());
   }
 
 
   static const ClassId kClassId = kTwoByteStringCid;
 
  private:
   static RawTwoByteString* raw(const String& str) {
     return reinterpret_cast<RawTwoByteString*>(str.raw());
@@ skipping 1202 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_