Reorder switch clauses using newly-introduced execution counters in

src/hydrogen.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1377 matching lines @@
     // Search the break stack for a break or continue target.
     enum BreakType { BREAK, CONTINUE };
     HBasicBlock* Get(BreakableStatement* stmt, BreakType type, int* drop_extra);
 
    private:
     BreakAndContinueInfo* info_;
     HOptimizedGraphBuilder* owner_;
     BreakAndContinueScope* next_;
   };
 
+  class ClauseMapping : public ZoneObject {
+   public:
+    ClauseMapping(int index, CaseClause* clause) : index_(index),
+                                                   clause_(clause) {
+    }
+
+    inline int index() const { return index_; }
+    inline CaseClause* clause() const { return clause_; }
+
+    static int HitCountOrder(ClauseMapping* const* a, ClauseMapping* const* b);
+
+   private:
+    int index_;
+    CaseClause* clause_;
+  };
+
   explicit HOptimizedGraphBuilder(CompilationInfo* info);
 
   virtual bool BuildGraph();
 
   // Simple accessors.
   BreakAndContinueScope* break_scope() const { return break_scope_; }
   void set_break_scope(BreakAndContinueScope* head) { break_scope_ = head; }
 
   bool inline_bailout() { return inline_bailout_; }
 
   void AddSoftDeoptimize();
+  HDeoptCounter* AddDeoptCounter(int initial_value, int max_value);
 
   void Bailout(const char* reason);
 
   HBasicBlock* CreateJoin(HBasicBlock* first,
                           HBasicBlock* second,
                           BailoutId join_id);
 
   FunctionState* function_state() const { return function_state_; }
 
   void VisitDeclarations(ZoneList<Declaration*>* declarations);
@@ skipping 366 matching lines @@
   FunctionState initial_function_state_;
 
   // Expression context of the currently visited subexpression. NULL when
   // visiting statements.
   AstContext* ast_context_;
 
   // A stack of breakable statements entered.
   BreakAndContinueScope* break_scope_;
 
   int inlined_count_;
+  int deopt_counter_count_;
   ZoneList<Handle<Object> > globals_;
 
   bool inline_bailout_;
 
   friend class FunctionState;  // Pushes and pops the state stack.
   friend class AstContext;  // Pushes and pops the AST context stack.
   friend class KeyedLoadFastElementStub;
 
   DISALLOW_COPY_AND_ASSIGN(HOptimizedGraphBuilder);
 };
@@ skipping 145 matching lines @@
   EmbeddedVector<char, 64> filename_;
   HeapStringAllocator string_allocator_;
   StringStream trace_;
   int indent_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_