Lazily compute boundfunction .name and .length if possible

src/objects.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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/assert-scope.h"
@@ skipping 7364 matching lines @@
   static const int kSize = kScopeInfoOffset + kPointerSize;
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSModule);
 };
 
 
 // JSBoundFunction describes a bound function exotic object.
 class JSBoundFunction : public JSObject {
  public:
-  // [length]: The bound function "length" property.
-  DECL_ACCESSORS(length, Object)
-
-  // [name]: The bound function "name" property.
-  DECL_ACCESSORS(name, Object)
-
   // [bound_target_function]: The wrapped function object.
   DECL_ACCESSORS(bound_target_function, JSReceiver)
 
   // [bound_this]: The value that is always passed as the this value when
   // calling the wrapped function.
   DECL_ACCESSORS(bound_this, Object)
 
   // [bound_arguments]: A list of values whose elements are used as the first
   // arguments to any call to the wrapped function.
   DECL_ACCESSORS(bound_arguments, FixedArray)
 
+  static MaybeHandle<String> GetName(Isolate* isolate,
+                                     Handle<JSBoundFunction> function);
   static MaybeHandle<Context> GetFunctionRealm(
       Handle<JSBoundFunction> function);
 
   DECLARE_CAST(JSBoundFunction)
 
   // Dispatched behavior.
   DECLARE_PRINTER(JSBoundFunction)
   DECLARE_VERIFIER(JSBoundFunction)
 
   // The bound function's string representation implemented according
   // to ES6 section 19.2.3.5 Function.prototype.toString ( ).
   static Handle<String> ToString(Handle<JSBoundFunction> function);
 
   // Layout description.
   static const int kBoundTargetFunctionOffset = JSObject::kHeaderSize;
   static const int kBoundThisOffset = kBoundTargetFunctionOffset + kPointerSize;
   static const int kBoundArgumentsOffset = kBoundThisOffset + kPointerSize;
-  static const int kLengthOffset = kBoundArgumentsOffset + kPointerSize;
-  static const int kNameOffset = kLengthOffset + kPointerSize;
-  static const int kSize = kNameOffset + kPointerSize;
-
-  // Indices of in-object properties.
-  static const int kLengthIndex = 0;
-  static const int kNameIndex = 1;
+  static const int kSize = kBoundArgumentsOffset + kPointerSize;
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSBoundFunction);
 };
 
 
 // JSFunction describes JavaScript functions.
 class JSFunction: public JSObject {
  public:
   // [prototype_or_initial_map]:
   DECL_ACCESSORS(prototype_or_initial_map, Object)
 
   // [shared]: The information about the function that
   // can be shared by instances.
   DECL_ACCESSORS(shared, SharedFunctionInfo)
 
   // [context]: The context for this function.
   inline Context* context();
   inline void set_context(Object* context);
   inline JSObject* global_proxy();
   inline Context* native_context();
 
+  static Handle<Object> GetName(Isolate* isolate, Handle<JSFunction> function);
+  static MaybeHandle<Smi> GetLength(Isolate* isolate,
+                                    Handle<JSFunction> function);
   static Handle<Context> GetFunctionRealm(Handle<JSFunction> function);
 
   // [code]: The generated code object for this function.  Executed
   // when the function is invoked, e.g. foo() or new foo(). See
   // [[Call]] and [[Construct]] description in ECMA-262, section
   // 8.6.2, page 27.
   inline Code* code();
   inline void set_code(Code* code);
   inline void set_code_no_write_barrier(Code* code);
   inline void ReplaceCode(Code* code);
@@ skipping 3309 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_