diff --git a/src/heap/factory-base-inl.h b/src/heap/factory-base-inl.h
index 6f218b8248..6c1cede212 100644
--- a/src/heap/factory-base-inl.h
+++ b/src/heap/factory-base-inl.h
@@ -6,9 +6,10 @@
 #define V8_HEAP_FACTORY_BASE_INL_H_
 
 #include "src/heap/factory-base.h"
-
 #include "src/numbers/conversions.h"
 #include "src/objects/heap-number.h"
+#include "src/objects/map.h"
+#include "src/objects/slots-inl.h"
 #include "src/objects/smi.h"
 #include "src/roots/roots.h"
 
@@ -93,6 +94,29 @@ Handle<HeapNumber> FactoryBase<Impl>::NewHeapNumberWithHoleNaN() {
   return NewHeapNumberFromBits<allocation>(kHoleNanInt64);
 }
 
+template <typename Impl>
+template <typename StructType>
+StructType FactoryBase<Impl>::NewStructInternal(InstanceType type,
+                                                AllocationType allocation) {
+  ReadOnlyRoots roots = read_only_roots();
+  Map map = Map::GetInstanceTypeMap(roots, type);
+  int size = StructType::kSize;
+  return StructType::cast(NewStructInternal(roots, map, size, allocation));
+}
+
+template <typename Impl>
+Struct FactoryBase<Impl>::NewStructInternal(ReadOnlyRoots roots, Map map,
+                                            int size,
+                                            AllocationType allocation) {
+  DCHECK_EQ(size, map.instance_size());
+  HeapObject result = AllocateRawWithImmortalMap(size, allocation, map);
+  Struct str = Struct::cast(result);
+  Object value = roots.undefined_value();
+  int length = (size >> kTaggedSizeLog2) - 1;
+  MemsetTagged(str.RawField(Struct::kHeaderSize), value, length);
+  return str;
+}
+
 }  // namespace internal
 }  // namespace v8
 
diff --git a/src/heap/factory-base.cc b/src/heap/factory-base.cc
index 27fcbba92a..a9223af42a 100644
--- a/src/heap/factory-base.cc
+++ b/src/heap/factory-base.cc
@@ -53,29 +53,20 @@ FactoryBase<LocalFactory>::NewHeapNumber<AllocationType::kOld>();
 template <typename Impl>
 Handle<Struct> FactoryBase<Impl>::NewStruct(InstanceType type,
                                             AllocationType allocation) {
-  return handle(NewStructInternal(type, allocation), isolate());
-}
-
-template <typename Impl>
-Struct FactoryBase<Impl>::NewStructInternal(InstanceType type,
-                                            AllocationType allocation) {
-  Map map = Map::GetInstanceTypeMap(read_only_roots(), type);
+  ReadOnlyRoots roots = read_only_roots();
+  Map map = Map::GetInstanceTypeMap(roots, type);
   int size = map.instance_size();
-  HeapObject result = AllocateRawWithImmortalMap(size, allocation, map);
-  Struct str = Struct::cast(result);
-  str.InitializeBody(size);
-  return str;
+  return handle(NewStructInternal(roots, map, size, allocation), isolate());
 }
 
 template <typename Impl>
 Handle<AccessorPair> FactoryBase<Impl>::NewAccessorPair() {
-  Handle<AccessorPair> accessors = Handle<AccessorPair>::cast(
-      NewStruct(ACCESSOR_PAIR_TYPE, AllocationType::kOld));
-  AccessorPair raw = *accessors;
+  auto accessors =
+      NewStructInternal<AccessorPair>(ACCESSOR_PAIR_TYPE, AllocationType::kOld);
   DisallowGarbageCollection no_gc;
-  raw.set_getter(read_only_roots().null_value(), SKIP_WRITE_BARRIER);
-  raw.set_setter(read_only_roots().null_value(), SKIP_WRITE_BARRIER);
-  return accessors;
+  accessors.set_getter(read_only_roots().null_value(), SKIP_WRITE_BARRIER);
+  accessors.set_setter(read_only_roots().null_value(), SKIP_WRITE_BARRIER);
+  return handle(accessors, isolate());
 }
 
 template <typename Impl>
@@ -233,8 +224,8 @@ Handle<Script> FactoryBase<Impl>::NewScriptWithId(
   DCHECK(source->IsString() || source->IsUndefined());
   // Create and initialize script object.
   ReadOnlyRoots roots = read_only_roots();
-  Handle<Script> script =
-      Handle<Script>::cast(NewStruct(SCRIPT_TYPE, AllocationType::kOld));
+  Handle<Script> script = handle(
+      NewStructInternal<Script>(SCRIPT_TYPE, AllocationType::kOld), isolate());
   {
     DisallowGarbageCollection no_gc;
     Script raw = *script;
@@ -397,14 +388,12 @@ template <typename Impl>
 Handle<ArrayBoilerplateDescription>
 FactoryBase<Impl>::NewArrayBoilerplateDescription(
     ElementsKind elements_kind, Handle<FixedArrayBase> constant_values) {
-  Handle<ArrayBoilerplateDescription> result =
-      Handle<ArrayBoilerplateDescription>::cast(
-          NewStruct(ARRAY_BOILERPLATE_DESCRIPTION_TYPE, AllocationType::kOld));
+  auto result = NewStructInternal<ArrayBoilerplateDescription>(
+      ARRAY_BOILERPLATE_DESCRIPTION_TYPE, AllocationType::kOld);
   DisallowGarbageCollection no_gc;
-  ArrayBoilerplateDescription raw = *result;
-  raw.set_elements_kind(elements_kind);
-  raw.set_constant_elements(*constant_values);
-  return result;
+  result.set_elements_kind(elements_kind);
+  result.set_constant_elements(*constant_values);
+  return handle(result, isolate());
 }
 
 template <typename Impl>
@@ -412,15 +401,13 @@ Handle<RegExpBoilerplateDescription>
 FactoryBase<Impl>::NewRegExpBoilerplateDescription(Handle<FixedArray> data,
                                                    Handle<String> source,
                                                    Smi flags) {
-  Handle<RegExpBoilerplateDescription> result =
-      Handle<RegExpBoilerplateDescription>::cast(NewStruct(
-          REG_EXP_BOILERPLATE_DESCRIPTION_TYPE, AllocationType::kOld));
+  auto result = NewStructInternal<RegExpBoilerplateDescription>(
+      REG_EXP_BOILERPLATE_DESCRIPTION_TYPE, AllocationType::kOld);
   DisallowGarbageCollection no_gc;
-  RegExpBoilerplateDescription raw = *result;
-  raw.set_data(*data);
-  raw.set_source(*source);
-  raw.set_flags(flags.value());
-  return result;
+  result.set_data(*data);
+  result.set_source(*source);
+  result.set_flags(flags.value());
+  return handle(result, isolate());
 }
 
 template <typename Impl>
@@ -429,14 +416,12 @@ FactoryBase<Impl>::NewTemplateObjectDescription(
     Handle<FixedArray> raw_strings, Handle<FixedArray> cooked_strings) {
   DCHECK_EQ(raw_strings->length(), cooked_strings->length());
   DCHECK_LT(0, raw_strings->length());
-  Handle<TemplateObjectDescription> result =
-      Handle<TemplateObjectDescription>::cast(
-          NewStruct(TEMPLATE_OBJECT_DESCRIPTION_TYPE, AllocationType::kOld));
+  auto result = NewStructInternal<TemplateObjectDescription>(
+      TEMPLATE_OBJECT_DESCRIPTION_TYPE, AllocationType::kOld);
   DisallowGarbageCollection no_gc;
-  TemplateObjectDescription raw = *result;
-  raw.set_raw_strings(*raw_strings);
-  raw.set_cooked_strings(*cooked_strings);
-  return result;
+  result.set_raw_strings(*raw_strings);
+  result.set_cooked_strings(*cooked_strings);
+  return handle(result, isolate());
 }
 
 template <typename Impl>
@@ -764,11 +749,11 @@ Handle<DescriptorArray> FactoryBase<Impl>::NewDescriptorArray(
 template <typename Impl>
 Handle<ClassPositions> FactoryBase<Impl>::NewClassPositions(int start,
                                                             int end) {
-  Handle<ClassPositions> class_positions = Handle<ClassPositions>::cast(
-      NewStruct(CLASS_POSITIONS_TYPE, AllocationType::kOld));
-  class_positions->set_start(start);
-  class_positions->set_end(end);
-  return class_positions;
+  auto result = NewStructInternal<ClassPositions>(CLASS_POSITIONS_TYPE,
+                                                  AllocationType::kOld);
+  result.set_start(start);
+  result.set_end(end);
+  return handle(result, isolate());
 }
 
 template <typename Impl>
diff --git a/src/heap/factory-base.h b/src/heap/factory-base.h
index b964f6b234..0575e4bcf1 100644
--- a/src/heap/factory-base.h
+++ b/src/heap/factory-base.h
@@ -234,8 +234,11 @@ class EXPORT_TEMPLATE_DECLARE(V8_EXPORT_PRIVATE) FactoryBase
   HeapObject AllocateRawFixedArray(int length, AllocationType allocation);
   HeapObject AllocateRawWeakArrayList(int length, AllocationType allocation);
 
-  Struct NewStructInternal(InstanceType type,
-                           AllocationType allocation = AllocationType::kYoung);
+  template <typename StructType>
+  inline StructType NewStructInternal(InstanceType type,
+                                      AllocationType allocation);
+  Struct NewStructInternal(ReadOnlyRoots roots, Map map, int size,
+                           AllocationType allocation);
 
   HeapObject AllocateRawWithImmortalMap(
       int size, AllocationType allocation, Map map,
diff --git a/src/heap/factory.cc b/src/heap/factory.cc
index a1310f8480..832d00390f 100644
--- a/src/heap/factory.cc
+++ b/src/heap/factory.cc
@@ -315,8 +315,8 @@ Handle<HeapObject> Factory::NewFillerObject(int size, bool double_align,
 }
 
 Handle<PrototypeInfo> Factory::NewPrototypeInfo() {
-  PrototypeInfo result = PrototypeInfo::cast(
-      NewStructInternal(PROTOTYPE_INFO_TYPE, AllocationType::kOld));
+  auto result = NewStructInternal<PrototypeInfo>(PROTOTYPE_INFO_TYPE,
+                                                 AllocationType::kOld);
   DisallowGarbageCollection no_gc;
   result.set_prototype_users(Smi::zero());
   result.set_registry_slot(PrototypeInfo::UNREGISTERED);
@@ -327,8 +327,8 @@ Handle<PrototypeInfo> Factory::NewPrototypeInfo() {
 
 Handle<EnumCache> Factory::NewEnumCache(Handle<FixedArray> keys,
                                         Handle<FixedArray> indices) {
-  EnumCache result =
-      EnumCache::cast(NewStructInternal(ENUM_CACHE_TYPE, AllocationType::kOld));
+  auto result =
+      NewStructInternal<EnumCache>(ENUM_CACHE_TYPE, AllocationType::kOld);
   DisallowGarbageCollection no_gc;
   result.set_keys(*keys);
   result.set_indices(*indices);
@@ -337,7 +337,7 @@ Handle<EnumCache> Factory::NewEnumCache(Handle<FixedArray> keys,
 
 Handle<Tuple2> Factory::NewTuple2(Handle<Object> value1, Handle<Object> value2,
                                   AllocationType allocation) {
-  Tuple2 result = Tuple2::cast(NewStructInternal(TUPLE2_TYPE, allocation));
+  auto result = NewStructInternal<Tuple2>(TUPLE2_TYPE, allocation);
   DisallowGarbageCollection no_gc;
   result.set_value1(*value1);
   result.set_value2(*value2);
@@ -346,8 +346,8 @@ Handle<Tuple2> Factory::NewTuple2(Handle<Object> value1, Handle<Object> value2,
 
 Handle<BaselineData> Factory::NewBaselineData(
     Handle<Code> code, Handle<HeapObject> function_data) {
-  BaselineData baseline_data = BaselineData::cast(
-      NewStructInternal(BASELINE_DATA_TYPE, AllocationType::kOld));
+  auto baseline_data =
+      NewStructInternal<BaselineData>(BASELINE_DATA_TYPE, AllocationType::kOld);
   DisallowGarbageCollection no_gc;
   baseline_data.set_baseline_code(*code);
   baseline_data.set_data(*function_data);
@@ -559,9 +559,8 @@ Handle<NameDictionary> Factory::NewNameDictionary(int at_least_space_for) {
 }
 
 Handle<PropertyDescriptorObject> Factory::NewPropertyDescriptorObject() {
-  PropertyDescriptorObject object =
-      PropertyDescriptorObject::cast(NewStructInternal(
-          PROPERTY_DESCRIPTOR_OBJECT_TYPE, AllocationType::kYoung));
+  auto object = NewStructInternal<PropertyDescriptorObject>(
+      PROPERTY_DESCRIPTOR_OBJECT_TYPE, AllocationType::kYoung);
   DisallowGarbageCollection no_gc;
   object.set_flags(0);
   Oddball the_hole = read_only_roots().the_hole_value();
@@ -1267,15 +1266,15 @@ Handle<Context> Factory::NewBuiltinContext(Handle<NativeContext> native_context,
 
 Handle<AliasedArgumentsEntry> Factory::NewAliasedArgumentsEntry(
     int aliased_context_slot) {
-  AliasedArgumentsEntry entry = AliasedArgumentsEntry::cast(
-      NewStructInternal(ALIASED_ARGUMENTS_ENTRY_TYPE, AllocationType::kYoung));
+  auto entry = NewStructInternal<AliasedArgumentsEntry>(
+      ALIASED_ARGUMENTS_ENTRY_TYPE, AllocationType::kYoung);
   entry.set_aliased_context_slot(aliased_context_slot);
   return handle(entry, isolate());
 }
 
 Handle<AccessorInfo> Factory::NewAccessorInfo() {
-  AccessorInfo info = AccessorInfo::cast(
-      NewStructInternal(ACCESSOR_INFO_TYPE, AllocationType::kOld));
+  auto info =
+      NewStructInternal<AccessorInfo>(ACCESSOR_INFO_TYPE, AllocationType::kOld);
   DisallowGarbageCollection no_gc;
   info.set_name(*empty_string(), SKIP_WRITE_BARRIER);
   info.set_flags(0);  // Must clear the flags, it was initialized as undefined.
@@ -1332,8 +1331,8 @@ Handle<Script> Factory::CloneScript(Handle<Script> script) {
 Handle<CallableTask> Factory::NewCallableTask(Handle<JSReceiver> callable,
                                               Handle<Context> context) {
   DCHECK(callable->IsCallable());
-  CallableTask microtask = CallableTask::cast(
-      NewStructInternal(CALLABLE_TASK_TYPE, AllocationType::kYoung));
+  auto microtask = NewStructInternal<CallableTask>(CALLABLE_TASK_TYPE,
+                                                   AllocationType::kYoung);
   DisallowGarbageCollection no_gc;
   microtask.set_callable(*callable, SKIP_WRITE_BARRIER);
   microtask.set_context(*context, SKIP_WRITE_BARRIER);
@@ -1342,8 +1341,8 @@ Handle<CallableTask> Factory::NewCallableTask(Handle<JSReceiver> callable,
 
 Handle<CallbackTask> Factory::NewCallbackTask(Handle<Foreign> callback,
                                               Handle<Foreign> data) {
-  CallbackTask microtask = CallbackTask::cast(
-      NewStructInternal(CALLBACK_TASK_TYPE, AllocationType::kYoung));
+  auto microtask = NewStructInternal<CallbackTask>(CALLBACK_TASK_TYPE,
+                                                   AllocationType::kYoung);
   DisallowGarbageCollection no_gc;
   microtask.set_callback(*callback, SKIP_WRITE_BARRIER);
   microtask.set_data(*data, SKIP_WRITE_BARRIER);
@@ -1354,9 +1353,8 @@ Handle<PromiseResolveThenableJobTask> Factory::NewPromiseResolveThenableJobTask(
     Handle<JSPromise> promise_to_resolve, Handle<JSReceiver> thenable,
     Handle<JSReceiver> then, Handle<Context> context) {
   DCHECK(then->IsCallable());
-  PromiseResolveThenableJobTask microtask =
-      PromiseResolveThenableJobTask::cast(NewStructInternal(
-          PROMISE_RESOLVE_THENABLE_JOB_TASK_TYPE, AllocationType::kYoung));
+  auto microtask = NewStructInternal<PromiseResolveThenableJobTask>(
+      PROMISE_RESOLVE_THENABLE_JOB_TASK_TYPE, AllocationType::kYoung);
   DisallowGarbageCollection no_gc;
   microtask.set_promise_to_resolve(*promise_to_resolve, SKIP_WRITE_BARRIER);
   microtask.set_thenable(*thenable, SKIP_WRITE_BARRIER);
@@ -3018,8 +3016,8 @@ Handle<String> Factory::SizeToString(size_t value, bool check_cache) {
 Handle<DebugInfo> Factory::NewDebugInfo(Handle<SharedFunctionInfo> shared) {
   DCHECK(!shared->HasDebugInfo());
 
-  DebugInfo debug_info =
-      DebugInfo::cast(NewStructInternal(DEBUG_INFO_TYPE, AllocationType::kOld));
+  auto debug_info =
+      NewStructInternal<DebugInfo>(DEBUG_INFO_TYPE, AllocationType::kOld);
   DisallowGarbageCollection no_gc;
   SharedFunctionInfo raw_shared = *shared;
   debug_info.set_flags(DebugInfo::kNone);
@@ -3041,8 +3039,8 @@ Handle<DebugInfo> Factory::NewDebugInfo(Handle<SharedFunctionInfo> shared) {
 }
 
 Handle<BreakPointInfo> Factory::NewBreakPointInfo(int source_position) {
-  BreakPointInfo new_break_point_info = BreakPointInfo::cast(
-      NewStructInternal(BREAK_POINT_INFO_TYPE, AllocationType::kOld));
+  auto new_break_point_info = NewStructInternal<BreakPointInfo>(
+      BREAK_POINT_INFO_TYPE, AllocationType::kOld);
   DisallowGarbageCollection no_gc;
   new_break_point_info.set_source_position(source_position);
   new_break_point_info.set_break_points(*undefined_value(), SKIP_WRITE_BARRIER);
@@ -3050,8 +3048,8 @@ Handle<BreakPointInfo> Factory::NewBreakPointInfo(int source_position) {
 }
 
 Handle<BreakPoint> Factory::NewBreakPoint(int id, Handle<String> condition) {
-  BreakPoint new_break_point = BreakPoint::cast(
-      NewStructInternal(BREAK_POINT_TYPE, AllocationType::kOld));
+  auto new_break_point =
+      NewStructInternal<BreakPoint>(BREAK_POINT_TYPE, AllocationType::kOld);
   DisallowGarbageCollection no_gc;
   new_break_point.set_id(id);
   new_break_point.set_condition(*condition);
@@ -3062,8 +3060,8 @@ Handle<StackFrameInfo> Factory::NewStackFrameInfo(
     Handle<Object> receiver_or_instance, Handle<Object> function,
     Handle<HeapObject> code_object, int code_offset_or_source_position,
     int flags, Handle<FixedArray> parameters) {
-  StackFrameInfo info = StackFrameInfo::cast(
-      NewStructInternal(STACK_FRAME_INFO_TYPE, AllocationType::kYoung));
+  auto info = NewStructInternal<StackFrameInfo>(STACK_FRAME_INFO_TYPE,
+                                                AllocationType::kYoung);
   DisallowGarbageCollection no_gc;
   info.set_receiver_or_instance(*receiver_or_instance, SKIP_WRITE_BARRIER);
   info.set_function(*function, SKIP_WRITE_BARRIER);
diff --git a/src/objects/struct-inl.h b/src/objects/struct-inl.h
index b313bc43f8..b062660fd1 100644
--- a/src/objects/struct-inl.h
+++ b/src/objects/struct-inl.h
@@ -28,13 +28,6 @@ NEVER_READ_ONLY_SPACE_IMPL(AccessorPair)
 
 TQ_OBJECT_CONSTRUCTORS_IMPL(ClassPositions)
 
-void Struct::InitializeBody(int object_size) {
-  Object value = GetReadOnlyRoots().undefined_value();
-  for (int offset = kHeaderSize; offset < object_size; offset += kTaggedSize) {
-    WRITE_FIELD(*this, offset, value);
-  }
-}
-
 Object AccessorPair::get(AccessorComponent component) {
   return component == ACCESSOR_GETTER ? getter() : setter();
 }
diff --git a/src/objects/struct.h b/src/objects/struct.h
index fa4fe42b62..ca0dcf4ac1 100644
--- a/src/objects/struct.h
+++ b/src/objects/struct.h
@@ -21,7 +21,6 @@ namespace internal {
 // identified in the type system.
 class Struct : public TorqueGeneratedStruct<Struct, HeapObject> {
  public:
-  inline void InitializeBody(int object_size);
   void BriefPrintDetails(std::ostream& os);
   STATIC_ASSERT(kHeaderSize == HeapObject::kHeaderSize);