Cache lookups at megamorphic call sites in optimized code.

runtime/vm/isolate.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_ISOLATE_H_
 #define VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
-#include "vm/class_table.h"
 #include "platform/thread.h"
 #include "vm/base_isolate.h"
+#include "vm/class_table.h"
 #include "vm/gc_callbacks.h"
+#include "vm/megamorphic_cache_table.h"
 #include "vm/store_buffer.h"
 #include "vm/timer.h"
 
 namespace dart {
 
 // Forward declarations.
 class ApiState;
 class CodeIndexTable;
 class Debugger;
 class HandleScope;
@@ skipping 83 matching lines @@
     return OFFSET_OF(Isolate, store_buffer_block_);
   }
 
   StoreBuffer* store_buffer() { return &store_buffer_; }
 
   ClassTable* class_table() { return &class_table_; }
   static intptr_t class_table_offset() {
     return OFFSET_OF(Isolate, class_table_);
   }
 
+  MegamorphicCacheTable* megamorphic_cache_table() {
+    return &megamorphic_cache_table_;
+  }
+
   Dart_MessageNotifyCallback message_notify_callback() const {
     return message_notify_callback_;
   }
   void set_message_notify_callback(Dart_MessageNotifyCallback value) {
     message_notify_callback_ = value;
   }
 
   const char* name() const { return name_; }
 
   Dart_Port main_port() { return main_port_; }
@@ skipping 191 matching lines @@
   void PrintInvokedFunctions();
 
   static uword GetSpecifiedStackSize();
 
   static const intptr_t kStackSizeBuffer = (16 * KB);
 
   static ThreadLocalKey isolate_key;
   StoreBufferBlock store_buffer_block_;
   StoreBuffer store_buffer_;
   ClassTable class_table_;
+  MegamorphicCacheTable megamorphic_cache_table_;
   Dart_MessageNotifyCallback message_notify_callback_;
   char* name_;
   Dart_Port main_port_;
   Heap* heap_;
   ObjectStore* object_store_;
   RawContext* top_context_;
   uword top_exit_frame_info_;
   void* init_callback_data_;
   Dart_LibraryTagHandler library_tag_handler_;
   ApiState* api_state_;
@@ skipping 86 matching lines @@
   Isolate* new_isolate_;
   Isolate* saved_isolate_;
   uword saved_stack_limit_;
 
   DISALLOW_COPY_AND_ASSIGN(SwitchIsolateScope);
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_