Reapply "Move megamorphic cache table into the Dart heap."

runtime/vm/object_store.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_STORE_H_
 #define VM_OBJECT_STORE_H_
 
 #include "vm/object.h"
 
 namespace dart {
@@ skipping 415 matching lines @@
     return OFFSET_OF(ObjectStore, library_load_error_table_);
   }
 
   RawArray* compile_time_constants() const {
     return compile_time_constants_;
   }
   void set_compile_time_constants(const Array& value) {
     compile_time_constants_ = value.raw();
   }
 
+  RawGrowableObjectArray* megamorphic_cache_table() const {
+    return megamorphic_cache_table_;
+  }
+  void set_megamorphic_cache_table(const GrowableObjectArray& value) {
+    megamorphic_cache_table_ = value.raw();
+  }
+  RawFunction* megamorphic_miss_function() const {
+    return megamorphic_miss_function_;
+  }
+  void SetMegamorphicMissHandler(const Code& code, const Function& func) {
+    // Hold onto the code so it is traced and not detached from the function.
+    megamorphic_miss_code_ = code.raw();
+    megamorphic_miss_function_ = func.raw();
+  }
+
   // Visit all object pointers.
   void VisitObjectPointers(ObjectPointerVisitor* visitor);
 
   // Called to initialize objects required by the vm but which invoke
   // dart code.  If an error occurs then false is returned and error
   // information is stored in sticky_error().
   bool PreallocateObjects();
 
   void InitKnownObjects();
 
@@ skipping 70 matching lines @@
   RawContext* empty_context_;
   RawInstance* stack_overflow_;
   RawInstance* out_of_memory_;
   RawUnhandledException* preallocated_unhandled_exception_;
   RawStacktrace* preallocated_stack_trace_;
   RawFunction* lookup_port_handler_;
   RawTypedData* empty_uint32_array_;
   RawFunction* handle_message_function_;
   RawArray* library_load_error_table_;
   RawArray* compile_time_constants_;
-  RawObject** to() {
+  RawObject** to_snapshot() {
     return reinterpret_cast<RawObject**>(&compile_time_constants_);
   }
+  RawGrowableObjectArray* megamorphic_cache_table_;
+  RawCode* megamorphic_miss_code_;
+  RawFunction* megamorphic_miss_function_;
+  RawObject** to() {
+    return reinterpret_cast<RawObject**>(&megamorphic_miss_function_);
+  }
 
+  friend class FullSnapshotWriter;
   friend class SnapshotReader;
   friend class VmIsolateSnapshotReader;
 
   DISALLOW_COPY_AND_ASSIGN(ObjectStore);
 };
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_STORE_H_