Move prototype metadata from internal properties to prototype maps

src/objects-printer.cc

 // 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.
 
 #include "src/v8.h"
 
 #include "src/disasm.h"
 #include "src/disassembler.h"
 #include "src/heap/objects-visiting.h"
 #include "src/jsregexp.h"
@@ skipping 398 matching lines @@
   HeapObject::PrintHeader(os, "Map");
   os << " - type: " << TypeToString(instance_type()) << "\n";
   os << " - instance size: " << instance_size() << "\n";
   os << " - inobject properties: " << inobject_properties() << "\n";
   os << " - elements kind: " << ElementsKindToString(elements_kind());
   os << "\n - pre-allocated property fields: "
      << pre_allocated_property_fields() << "\n";
   os << " - unused property fields: " << unused_property_fields() << "\n";
   if (is_deprecated()) os << " - deprecated_map\n";
   if (is_dictionary_map()) os << " - dictionary_map\n";
-  if (is_prototype_map()) os << " - prototype_map\n";
+  if (is_prototype_map()) {
+    os << " - prototype_map\n";
+    os << " - prototype info: " << Brief(prototype_info());
+  } else {
+    os << " - back pointer: " << Brief(GetBackPointer());
+  }
   if (is_hidden_prototype()) os << " - hidden_prototype\n";
   if (has_named_interceptor()) os << " - named_interceptor\n";
   if (has_indexed_interceptor()) os << " - indexed_interceptor\n";
   if (is_undetectable()) os << " - undetectable\n";
   if (has_instance_call_handler()) os << " - instance_call_handler\n";
   if (is_access_check_needed()) os << " - access_check_needed\n";
   if (!is_extensible()) os << " - non-extensible\n";
   if (is_observed()) os << " - observed\n";
-  os << " - back pointer: " << Brief(GetBackPointer());
   os << "\n - instance descriptors " << (owns_descriptors() ? "(own) " : "")
      << "#" << NumberOfOwnDescriptors() << ": "
      << Brief(instance_descriptors());
   if (FLAG_unbox_double_fields) {
     os << "\n - layout descriptor: " << Brief(layout_descriptor());
   }
   if (TransitionArray::NumberOfTransitions(raw_transitions()) > 0) {
     os << "\n - transitions: ";
     TransitionArray::PrintTransitions(os, raw_transitions());
   }
@@ skipping 427 matching lines @@
 }
 
 
 void Box::BoxPrint(std::ostream& os) {  // NOLINT
   HeapObject::PrintHeader(os, "Box");
   os << "\n - value: " << Brief(value());
   os << "\n";
 }
 
 
+void PrototypeInfo::PrototypeInfoPrint(std::ostream& os) {  // NOLINT
+  HeapObject::PrintHeader(os, "PrototypeInfo");
+  os << "\n - prototype users: " << Brief(prototype_users());
+  os << "\n - validity cell: " << Brief(validity_cell());
+  os << "\n";
+}
+
+
 void AccessorPair::AccessorPairPrint(std::ostream& os) {  // NOLINT
   HeapObject::PrintHeader(os, "AccessorPair");
   os << "\n - getter: " << Brief(getter());
   os << "\n - setter: " << Brief(setter());
   os << "\n";
 }
 
 
 void AccessCheckInfo::AccessCheckInfoPrint(std::ostream& os) {  // NOLINT
   HeapObject::PrintHeader(os, "AccessCheckInfo");
@@ skipping 303 matching lines @@
     os << " -> " << Brief(target) << "\n";
   }
 }
 
 
 void JSObject::PrintTransitions(std::ostream& os) {  // NOLINT
   TransitionArray::PrintTransitions(os, map()->raw_transitions());
 }
 #endif  // defined(DEBUG) || defined(OBJECT_PRINT)
 } }  // namespace v8::internal