[runtime] Add fast-paths for common conversion methods

src/objects-inl.h

 // Copyright 2012 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.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 1084 matching lines @@
 }
 
 
 // static
 MaybeHandle<Name> Object::ToName(Isolate* isolate, Handle<Object> input) {
   if (input->IsName()) return Handle<Name>::cast(input);
   return ConvertToName(isolate, input);
 }
 
 // static
+MaybeHandle<Object> Object::ToPropertyKey(Isolate* isolate,
+                                          Handle<Object> value) {
+  if (value->IsSmi() || HeapObject::cast(*value)->IsName()) return value;
+  return ConvertToPropertyKey(isolate, value);
+}
+
+// static
 MaybeHandle<Object> Object::ToPrimitive(Handle<Object> input,
                                         ToPrimitiveHint hint) {
   if (input->IsPrimitive()) return input;
   return JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(input), hint);
 }
 
 // static
 MaybeHandle<Object> Object::ToNumber(Handle<Object> input) {
   if (input->IsNumber()) return input;
   return ConvertToNumber(HeapObject::cast(*input)->GetIsolate(), input);
@@ skipping 16 matching lines @@
   if (input->IsSmi()) return handle(Smi::cast(*input)->ToUint32Smi(), isolate);
   return ConvertToUint32(isolate, input);
 }
 
 // static
 MaybeHandle<String> Object::ToString(Isolate* isolate, Handle<Object> input) {
   if (input->IsString()) return Handle<String>::cast(input);
   return ConvertToString(isolate, input);
 }
 
+// static
+MaybeHandle<Object> Object::ToLength(Isolate* isolate, Handle<Object> input) {
+  if (input->IsSmi()) {
+    int value = std::max(Smi::cast(*input)->value(), 0);
+    return handle(Smi::FromInt(value), isolate);
+  }
+  return ConvertToLength(isolate, input);
+}
+
+// static
+MaybeHandle<Object> Object::ToIndex(Isolate* isolate, Handle<Object> input,
+                                    MessageTemplate::Template error_index) {
+  if (input->IsSmi() && Smi::cast(*input)->value() >= 0) return input;
+  return ConvertToIndex(isolate, input, error_index);
+}
+
 bool Object::HasSpecificClassOf(String* name) {
   return this->IsJSObject() && (JSObject::cast(this)->class_name() == name);
 }
 
 MaybeHandle<Object> Object::GetProperty(Handle<Object> object,
                                         Handle<Name> name) {
   LookupIterator it(object, name);
   if (!it.IsFound()) return it.factory()->undefined_value();
   return GetProperty(&it);
 }
@@ skipping 7280 matching lines @@
 #undef WRITE_INT64_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_INL_H_