Track live instance and allocation counts for classes

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/object.h"
 #include "vm/snapshot_ids.h"
 
@@ skipping 107 matching lines @@
   V(_Mint, "_Mint")                                                            \
   V(_Bigint, "_Bigint")                                                        \
   V(_Double, "_Double")                                                        \
   V(Bool, "bool")                                                              \
   V(_List, "_List")                                                            \
   V(_ListFactory, "_List.")                                                    \
   V(_GrowableList, "_GrowableList")                                            \
   V(_GrowableListFactory, "_GrowableList.")                                    \
   V(_GrowableListWithData, "_GrowableList.withData")                           \
   V(_ImmutableList, "_ImmutableList")                                          \
+  V(_String, "String")                                                         \
   V(OneByteString, "_OneByteString")                                           \
   V(TwoByteString, "_TwoByteString")                                           \
   V(ExternalOneByteString, "_ExternalOneByteString")                           \
   V(ExternalTwoByteString, "_ExternalTwoByteString")                           \
   V(StackTrace, "StackTrace")                                                  \
   V(JSSyntaxRegExp, "_JSSyntaxRegExp")                                         \
   V(Object, "Object")                                                          \
   V(Int, "int")                                                                \
   V(Double, "double")                                                          \
   V(_Float32x4, "_Float32x4")                                                  \
@@ skipping 373 matching lines @@
   friend class SnapshotReader;
   friend class SnapshotWriter;
   friend class ApiMessageReader;
 
   DISALLOW_COPY_AND_ASSIGN(Symbols);
 };
 
 }  // namespace dart
 
 #endif  // VM_SYMBOLS_H_