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

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 1247 matching lines @@
   }
   void set_is_finalized() const;
 
   bool is_prefinalized() const {
     return ClassFinalizedBits::decode(raw_ptr()->state_bits_)
         == RawClass::kPreFinalized;
   }
 
   void set_is_prefinalized() const;
 
+  bool is_refinalize_after_patch() const {
+    return ClassFinalizedBits::decode(raw_ptr()->state_bits_)
+        == RawClass::kRefinalizeAfterPatch;
+  }
+
+  void SetRefinalizeAfterPatch() const;
   void ResetFinalization() const;
 
   bool is_marked_for_parsing() const {
     return MarkedForParsingBit::decode(raw_ptr()->state_bits_);
   }
   void set_is_marked_for_parsing() const;
   void reset_is_marked_for_parsing() const;
 
   bool is_const() const { return ConstBit::decode(raw_ptr()->state_bits_); }
   void set_is_const() const;
@@ skipping 93 matching lines @@
   void RegisterCHACode(const Code& code);
 
   void DisableCHAOptimizedCode(const Class& subclass);
 
   RawArray* cha_codes() const { return raw_ptr()->cha_codes_; }
   void set_cha_codes(const Array& value) const;
 
   bool TraceAllocation(Isolate* isolate) const;
   void SetTraceAllocation(bool trace_allocation) const;
 
+  bool ValidatePostFinalizePatch(const Class& orig_class, Error* error) const;
+
  private:
   enum MemberKind {
     kAny = 0,
     kStatic,
     kInstance,
     kInstanceAllowAbstract,
     kConstructor,
     kFactory,
   };
   enum StateBits {
@@ skipping 7024 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_