Provide ability to patch external functions in a class that has already been finalized. The follow…

runtime/vm/raw_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_RAW_OBJECT_H_
 #define VM_RAW_OBJECT_H_
 
 #include "platform/assert.h"
 #include "vm/atomic.h"
 #include "vm/globals.h"
@@ skipping 659 matching lines @@
   DISALLOW_IMPLICIT_CONSTRUCTORS(RawObject);
 };
 
 
 class RawClass : public RawObject {
  public:
   enum ClassFinalizedState {
     kAllocated = 0,  // Initial state.
     kPreFinalized,  // VM classes: size precomputed, but no checks done.
     kFinalized,  // Class parsed, finalized and ready for use.
+    kRefinalizeAfterPatch,  // Class needs to be refinalized (patched).
   };
 
  private:
   RAW_HEAP_OBJECT_IMPLEMENTATION(Class);
 
   RawObject** from() { return reinterpret_cast<RawObject**>(&ptr()->name_); }
   RawString* name_;
   NOT_IN_PRODUCT(RawString* user_name_);
   RawArray* functions_;
   RawArray* functions_hash_table_;
@@ skipping 1675 matching lines @@
   COMPILE_ASSERT(kExternalTypedDataInt8ArrayCid ==
                  kTypedDataInt8ArrayViewCid + 15);
   COMPILE_ASSERT(kByteBufferCid == kExternalTypedDataInt8ArrayCid + 14);
   COMPILE_ASSERT(kNullCid == kByteBufferCid + 1);
   return (kNullCid - kTypedDataInt8ArrayCid);
 }
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_