[runtime] Optimize and unify rest parameters.

src/compiler/js-operator.h

 // Copyright 2013 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_COMPILER_JS_OPERATOR_H_
 #define V8_COMPILER_JS_OPERATOR_H_
 
 #include "src/compiler/type-hints.h"
 #include "src/runtime/runtime.h"
 
@@ skipping 330 matching lines @@
 bool operator==(PropertyAccess const&, PropertyAccess const&);
 bool operator!=(PropertyAccess const&, PropertyAccess const&);
 
 size_t hash_value(PropertyAccess const&);
 
 std::ostream& operator<<(std::ostream&, PropertyAccess const&);
 
 PropertyAccess const& PropertyAccessOf(const Operator* op);
 
 
-// Defines specifics about arguments object or rest parameter creation. This is
-// used as a parameter by JSCreateArguments operators.
-class CreateArgumentsParameters final {
- public:
-  enum Type { kMappedArguments, kUnmappedArguments, kRestArray };
-  CreateArgumentsParameters(Type type, int start_index)
-      : type_(type), start_index_(start_index) {}
-
-  Type type() const { return type_; }
-  int start_index() const { return start_index_; }
-
- private:
-  const Type type_;
-  const int start_index_;
-};
-
-bool operator==(CreateArgumentsParameters const&,
-                CreateArgumentsParameters const&);
-bool operator!=(CreateArgumentsParameters const&,
-                CreateArgumentsParameters const&);
-
-size_t hash_value(CreateArgumentsParameters const&);
-
-std::ostream& operator<<(std::ostream&, CreateArgumentsParameters const&);
-
-const CreateArgumentsParameters& CreateArgumentsParametersOf(
-    const Operator* op);
+// CreateArgumentsType is used as parameter to JSCreateArguments nodes.
+CreateArgumentsType const& CreateArgumentsTypeOf(const Operator* op);
 
 
 // Defines shared information for the array that should be created. This is
 // used as parameter by JSCreateArray operators.
 class CreateArrayParameters final {
  public:
   explicit CreateArrayParameters(size_t arity, Handle<AllocationSite> site)
       : arity_(arity), site_(site) {}
 
   size_t arity() const { return arity_; }
@@ skipping 106 matching lines @@
                           BinaryOperationHints hints);
 
   const Operator* ToBoolean(ToBooleanHints hints);
   const Operator* ToNumber();
   const Operator* ToString();
   const Operator* ToName();
   const Operator* ToObject();
   const Operator* Yield();
 
   const Operator* Create();
-  const Operator* CreateArguments(CreateArgumentsParameters::Type type,
-                                  int start_index);
+  const Operator* CreateArguments(CreateArgumentsType type);
   const Operator* CreateArray(size_t arity, Handle<AllocationSite> site);
   const Operator* CreateClosure(Handle<SharedFunctionInfo> shared_info,
                                 PretenureFlag pretenure);
   const Operator* CreateIterResultObject();
   const Operator* CreateLiteralArray(Handle<FixedArray> constant_elements,
                                      int literal_flags, int literal_index);
   const Operator* CreateLiteralObject(Handle<FixedArray> constant_properties,
                                       int literal_flags, int literal_index);
   const Operator* CreateLiteralRegExp(Handle<String> constant_pattern,
                                       int literal_flags, int literal_index);
@@ skipping 64 matching lines @@
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(JSOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_OPERATOR_H_