Very simple version of Isolates.

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 198 matching lines @@
   V(_ExternalFloat64Array, "_ExternalFloat64Array")                            \
   V(ByteData, "ByteData")                                                      \
   V(ByteDataDot, "ByteData.")                                                  \
   V(ByteDataDotview, "ByteData.view")                                          \
   V(_ByteDataView, "_ByteDataView")                                            \
   V(_WeakProperty, "_WeakProperty")                                            \
   V(_MirrorReference, "_MirrorReference")                                      \
   V(InvocationMirror, "_InvocationMirror")                                     \
   V(AllocateInvocationMirror, "_allocateInvocationMirror")                     \
   V(toString, "toString")                                                      \
-  V(_ReceivePortImpl, "_ReceivePortImpl")                                      \
+  V(_RawReceivePortImpl, "_RawReceivePortImpl")                                \
   V(_lookupReceivePort, "_lookupReceivePort")                                  \
   V(_handleMessage, "_handleMessage")                                          \
   V(_SendPortImpl, "_SendPortImpl")                                            \
   V(_create, "_create")                                                        \
   V(DotCreate, "._create")                                                     \
   V(DotWithType, "._withType")                                                 \
   V(_id, "_id")                                                                \
   V(_get_or_create, "_get_or_create")                                          \
   V(RangeError, "RangeError")                                                  \
   V(ArgumentError, "ArgumentError")                                            \
   V(FormatException, "FormatException")                                        \
   V(UnsupportedError, "UnsupportedError")                                      \
   V(StackOverflowError, "StackOverflowError")                                  \
   V(OutOfMemoryError, "OutOfMemoryError")                                      \
   V(InternalError, "InternalError")                                            \
   V(NullThrownError, "NullThrownError")                                        \
   V(IsolateSpawnException, "IsolateSpawnException")                            \
-  V(IsolateUnhandledException, "IsolateUnhandledException")                    \
+  V(IsolateUnhandledException, "_IsolateUnhandledException")                   \
   V(JavascriptIntegerOverflowError, "_JavascriptIntegerOverflowError")         \
   V(MirroredCompilationError, "MirroredCompilationError")                      \
   V(_setupFullStackTrace, "_setupFullStackTrace")                              \
   V(BooleanExpression, "boolean expression")                                   \
   V(Malformed, "malformed")                                                    \
   V(InstanceOf, "InstanceOf")                                                  \
   V(MegamorphicMiss, "megamorphic_miss")                                       \
   V(CommaSpace, ", ")                                                          \
   V(ColonSpace, ": ")                                                          \
   V(RParenArrow, ") => ")                                                      \
@@ skipping 240 matching lines @@
   friend class SnapshotReader;
   friend class SnapshotWriter;
   friend class ApiMessageReader;
 
   DISALLOW_COPY_AND_ASSIGN(Symbols);
 };
 
 }  // namespace dart
 
 #endif  // VM_SYMBOLS_H_