[dict-proto] getter for ordered property dicts

This adds a getter for ordered property dictionaries of maps

Bug: v8:7569
Change-Id: I7e8668ec707734b97f41f1a85c70b00b3b10c981
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2465824
Commit-Queue: Frank Emrich <emrich@google.com>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70617}

src/objects/js-objects-inl.h

@@ -5,6 +5,7 @@
 #ifndef V8_OBJECTS_JS_OBJECTS_INL_H_
 #define V8_OBJECTS_JS_OBJECTS_INL_H_
 
+#include "src/common/globals.h"
 #include "src/heap/heap-write-barrier.h"
 #include "src/objects/elements.h"
 #include "src/objects/embedder-data-slot-inl.h"
@@ -656,6 +657,8 @@ DEF_GETTER(JSReceiver, HasFastProperties, bool) {
 DEF_GETTER(JSReceiver, property_dictionary, NameDictionary) {
   DCHECK(!IsJSGlobalObject(isolate));
   DCHECK(!HasFastProperties(isolate));
+  DCHECK(!V8_DICT_MODE_PROTOTYPES_BOOL);
+
   // Can't use ReadOnlyRoots(isolate) as this isolate could be produced by
   // i::GetIsolateForPtrCompr(HeapObject).
   Object prop = raw_properties_or_hash(isolate);
@@ -665,6 +668,20 @@ DEF_GETTER(JSReceiver, property_dictionary, NameDictionary) {
   return NameDictionary::cast(prop);
 }
 
+DEF_GETTER(JSReceiver, property_dictionary_ordered, OrderedNameDictionary) {
+  DCHECK(!IsJSGlobalObject(isolate));
+  DCHECK(!HasFastProperties(isolate));
+  DCHECK(V8_DICT_MODE_PROTOTYPES_BOOL);
+
+  // Can't use ReadOnlyRoots(isolate) as this isolate could be produced by
+  // i::GetIsolateForPtrCompr(HeapObject).
+  Object prop = raw_properties_or_hash(isolate);
+  if (prop.IsSmi()) {
+    return GetReadOnlyRoots(isolate).empty_ordered_property_dictionary();
+  }
+  return OrderedNameDictionary::cast(prop);
+}
+
 // TODO(gsathya): Pass isolate directly to this function and access
 // the heap from this.
 DEF_GETTER(JSReceiver, property_array, PropertyArray) {

src/objects/js-objects.h

@@ -43,9 +43,14 @@ class JSReceiver : public HeapObject {
   // map.
   DECL_GETTER(property_array, PropertyArray)
 
-  // Gets slow properties for non-global objects.
+  // Gets slow properties for non-global objects (if v8_dict_mode_prototypes is
+  // not set).
   DECL_GETTER(property_dictionary, NameDictionary)
 
+  // Gets slow properties for non-global objects (if v8_dict_mode_prototypes is
+  // set).
+  DECL_GETTER(property_dictionary_ordered, OrderedNameDictionary)
+
   // Sets the properties backing store and makes sure any existing hash is moved
   // to the new properties store. To clear out the properties store, pass in the
   // empty_fixed_array(), the hash will be maintained in this case as well.