Optimize Object.seal and Object.preventExtensions

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 404 matching lines @@
      << pre_allocated_property_fields() << "\n";
   os << " - unused property fields: " << unused_property_fields() << "\n";
   if (is_dictionary_map()) os << " - dictionary_map\n";
   if (is_prototype_map()) os << " - prototype_map\n";
   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_frozen()) {
-    os << " - frozen\n";
-  } else if (!is_extensible()) {
-    os << " - sealed\n";
-  }
+  if (!is_extensible()) os << " - non-extensible\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 (HasTransitionArray()) {
     os << "\n - transitions: " << Brief(transitions());
   }
@@ skipping 693 matching lines @@
 void TransitionArray::PrintTransitions(std::ostream& os,
                                        bool print_header) {  // NOLINT
   if (print_header) {
     os << "Transition array " << number_of_transitions() << "\n";
   }
   for (int i = 0; i < number_of_transitions(); i++) {
     Name* key = GetKey(i);
     os << "   ";
     key->NamePrint(os);
     os << ": ";
     if (key == GetHeap()->frozen_symbol()) {

[Igor Sheludko, 2014/12/10 11:31:15]

Please add support for seal and nonextensible transitions here.

[adamk, 2014/12/10 18:46:01]

Done.

       os << " (transition to frozen)";
     } else if (key == GetHeap()->elements_transition_symbol()) {
       os << " (transition to "
          << ElementsKindToString(GetTarget(i)->elements_kind()) << ")";
     } else if (key == GetHeap()->observed_symbol()) {
       os << " (transition to Object.observe)";
     } else {
       PropertyDetails details = GetTargetDetails(i);
       switch (details.type()) {
         case FIELD: {
@@ skipping 45 matching lines @@
       return SNPrintF(str, "#<%s>", s->PrivateSymbolToName());
     } else {
       return SNPrintF(str, "<%s>", String::cast(s->name())->ToCString().get());
     }
   }
 }
 
 
 #endif  // TRACE_MAPS
 } }  // namespace v8::internal