[Interpreter] Add support for for count operations.

src/interpreter/bytecode-generator.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_INTERPRETER_BYTECODE_GENERATOR_H_
 #define V8_INTERPRETER_BYTECODE_GENERATOR_H_
 
 #include "src/ast.h"
 #include "src/interpreter/bytecode-array-builder.h"
 #include "src/interpreter/bytecodes.h"
@@ skipping 23 matching lines @@
   class ExpressionResultScope;
   class EffectResultScope;
   class AccumulatorResultScope;
   class RegisterResultScope;
 
   void MakeBytecodeBody();
   Register NextContextRegister() const;
 
   DEFINE_AST_VISITOR_SUBCLASS_MEMBERS();
 
-  Register VisitArguments(ZoneList<Expression*>* arguments);
-
+  // Dispatched from VisitBinaryOperation.
   void VisitArithmeticExpression(BinaryOperation* binop);
   void VisitCommaExpression(BinaryOperation* binop);
   void VisitLogicalOrExpression(BinaryOperation* binop);
   void VisitLogicalAndExpression(BinaryOperation* binop);
 
+  // Dispatched from VisitUnaryOperation.
+  void VisitVoid(UnaryOperation* expr);
+  void VisitTypeOf(UnaryOperation* expr);
+  void VisitNot(UnaryOperation* expr);
+
+  // Helper visitors which perform common operations.
+  Register VisitArguments(ZoneList<Expression*>* arguments);
+
   void VisitPropertyLoad(Register obj, Property* expr);
   void VisitPropertyLoadForAccumulator(Register obj, Property* expr);
 
   void VisitVariableLoad(Variable* variable, FeedbackVectorSlot slot);
+  void VisitVariableLoadForAccumulatorValue(Variable* variable,
+                                            FeedbackVectorSlot slot);
+  MUST_USE_RESULT Register VisitVariableLoadForRegisterValue(
+      Variable* variable, FeedbackVectorSlot slot);
   void VisitVariableAssignment(Variable* variable, FeedbackVectorSlot slot);
 
   void VisitNewLocalFunctionContext();
   void VisitBuildLocalActivationContext();
   void VisitNewLocalBlockContext(Scope* scope);
   void VisitFunctionClosureForContext();
   void VisitSetHomeObject(Register value, Register home_object,
                           ObjectLiteralProperty* property, int slot_number = 0);
   void VisitObjectLiteralAccessor(Register home_object,
                                   ObjectLiteralProperty* property,
                                   Register value_out);
 
-  // Dispatched from VisitUnaryOperation.
-  void VisitVoid(UnaryOperation* expr);
-  void VisitTypeOf(UnaryOperation* expr);
-  void VisitNot(UnaryOperation* expr);
 
   // Visitors for obtaining expression result in the accumulator, in a
   // register, or just getting the effect.
   void VisitForAccumulatorValue(Expression* expression);
   MUST_USE_RESULT Register VisitForRegisterValue(Expression* expression);
   void VisitForEffect(Expression* node);
 
   // Methods marking the start and end of binary expressions.
   void PrepareForBinaryExpression();
   void CompleteBinaryExpression();
@@ skipping 42 matching lines @@
 
   int binary_expression_depth_;
   ZoneSet<int> binary_expression_hazard_set_;
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_GENERATOR_H_