[cleanup] Refactor builtins-number.cc

src/builtins/builtins-utils.h

 // Copyright 2016 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_BUILTINS_BUILTINS_UTILS_H_
 #define V8_BUILTINS_BUILTINS_UTILS_H_
 
 #include "src/arguments.h"
 #include "src/base/logging.h"
 #include "src/builtins/builtins.h"
@@ skipping 84 matching lines @@
       return Builtin_Impl_Stats_##name(args_length, args_object, isolate);    \
     }                                                                         \
     BuiltinArguments args(args_length, args_object);                          \
     return Builtin_Impl_##name(args, isolate);                                \
   }                                                                           \
                                                                               \
   MUST_USE_RESULT static Object* Builtin_Impl_##name(BuiltinArguments args,   \
                                                      Isolate* isolate)
 
 // ----------------------------------------------------------------------------
+// Support macro for defining builtins with Turbofan.
+// ----------------------------------------------------------------------------
+//
+// A builtin function is defined by writing:
+//
+//   TF_BUILTIN(name, code_assember_base_class) {
+//     ...
+//   }
+//
+// In the body of the builtin function the arguments can be accessed
+// as "Parameter(n)".
+#define TF_BUILTIN(Name, AssemblerBase)                                 \
+  class Name##Assembler : public AssemblerBase {                        \
+   public:                                                              \
+    explicit Name##Assembler(compiler::CodeAssemblerState* state)       \
+        : AssemblerBase(state) {}                                       \
+    void Generate##Name();                                              \
+  };                                                                    \
+  void Builtins::Generate_##Name(compiler::CodeAssemblerState* state) { \
+    Name##Assembler assembler(state);                                   \
+    assembler.Generate##Name();                                         \
+  }                                                                     \
+  void Name##Assembler::Generate##Name()
+
+// ----------------------------------------------------------------------------
 
 #define CHECK_RECEIVER(Type, name, method)                                  \
   if (!args.receiver()->Is##Type()) {                                       \
     THROW_NEW_ERROR_RETURN_FAILURE(                                         \
         isolate,                                                            \
         NewTypeError(MessageTemplate::kIncompatibleMethodReceiver,          \
                      isolate->factory()->NewStringFromAsciiChecked(method), \
                      args.receiver()));                                     \
   }                                                                         \
   Handle<Type> name = Handle<Type>::cast(args.receiver())
@@ skipping 10 matching lines @@
                      isolate->factory()->NewStringFromAsciiChecked(method))); \
   }                                                                           \
   Handle<String> name;                                                        \
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(                                         \
       isolate, name, Object::ToString(isolate, args.receiver()))
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_BUILTINS_BUILTINS_UTILS_H_