Make Object.freeze fast

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2277 matching lines @@
   // Check whether this object references another object
   bool ReferencesObject(Object* obj);
 
   // Casting.
   static inline JSObject* cast(Object* obj);
 
   // Disalow further properties to be added to the object.
   static Handle<Object> PreventExtensions(Handle<JSObject> object);
   MUST_USE_RESULT MaybeObject* PreventExtensions();
 
+  // ES5 Object.freeze
+  MUST_USE_RESULT MaybeObject* Freeze(Isolate* isolate);
+
   // Copy object
   MUST_USE_RESULT MaybeObject* DeepCopy(Isolate* isolate);
 
   // Dispatched behavior.
   void JSObjectShortPrint(StringStream* accumulator);
   DECLARE_PRINTER(JSObject)
   DECLARE_VERIFIER(JSObject)
 #ifdef OBJECT_PRINT
   inline void PrintProperties() {
     PrintProperties(stdout);
@@ skipping 517 matching lines @@
   MUST_USE_RESULT MaybeObject* Merge(int verbatim,
                                      int valid,
                                      int new_size,
                                      DescriptorArray* other);
 
   bool IsMoreGeneralThan(int verbatim,
                          int valid,
                          int new_size,
                          DescriptorArray* other);
 
-  MUST_USE_RESULT MaybeObject* CopyUpTo(int enumeration_index);
+  MUST_USE_RESULT MaybeObject* CopyUpTo(int enumeration_index) {
+    return CopyUpToAddAttributes(enumeration_index, NONE);
+  }
+
+  MUST_USE_RESULT MaybeObject* CopyUpToAddAttributes(
+      int enumeration_index,
+      PropertyAttributes attributes);
 
   // Sort the instance descriptors by the hash codes of their keys.
   void Sort();
 
   // Search the instance descriptors for given name.
   INLINE(int Search(Name* name, int number_of_own_descriptors));
 
   // As the above, but uses DescriptorLookupCache and updates it when
   // necessary.
   INLINE(int SearchWithCache(Name* name, Map* map));
@@ skipping 514 matching lines @@
   void SetNextEnumerationIndex(int index) {
     ASSERT(index != 0);
     this->set(kNextEnumerationIndexIndex, Smi::FromInt(index));
   }
 
   int NextEnumerationIndex() {
     return Smi::cast(FixedArray::get(kNextEnumerationIndexIndex))->value();
   }
 
   // Returns a new array for dictionary usage. Might return Failure.
-  MUST_USE_RESULT static MaybeObject* Allocate(Heap* heap,
-                                               int at_least_space_for);
+  MUST_USE_RESULT static MaybeObject* Allocate(
+      Heap* heap,
+      int at_least_space_for,
+      PretenureFlag pretenure = NOT_TENURED);
 
   // Ensure enough space for n additional elements.
   MUST_USE_RESULT MaybeObject* EnsureCapacity(int n, Key key);
 
 #ifdef OBJECT_PRINT
   inline void Print() {
     Print(stdout);
   }
   void Print(FILE* out);
 #endif
@@ skipping 1680 matching lines @@
   inline void set_bit_field3(int value);
 
   class EnumLengthBits:             public BitField<int,   0, 11> {};
   class NumberOfOwnDescriptorsBits: public BitField<int,  11, 11> {};
   class IsShared:                   public BitField<bool, 22,  1> {};
   class FunctionWithPrototype:      public BitField<bool, 23,  1> {};
   class DictionaryMap:              public BitField<bool, 24,  1> {};
   class OwnsDescriptors:            public BitField<bool, 25,  1> {};
   class IsObserved:                 public BitField<bool, 26,  1> {};
   class Deprecated:                 public BitField<bool, 27,  1> {};
+  class IsFrozen:                   public BitField<bool, 28,  1> {};
 
   // Tells whether the object in the prototype property will be used
   // for instances created from this function.  If the prototype
   // property is set to a value that is not a JSObject, the prototype
   // property will not be used to create instances of the function.
   // See ECMA-262, 13.2.2.
   inline void set_non_instance_prototype(bool value);
   inline bool has_non_instance_prototype();
 
   // Tells whether function has special prototype property. If not, prototype
@@ skipping 282 matching lines @@
       ASSERT(length <= NumberOfOwnDescriptors());
     }
     set_bit_field3(EnumLengthBits::update(bit_field3(), length));
   }
 
   inline bool CanTrackAllocationSite();
   inline bool owns_descriptors();
   inline void set_owns_descriptors(bool is_shared);
   inline bool is_observed();
   inline void set_is_observed(bool is_observed);
+  inline void freeze();
+  inline bool is_frozen();
   inline void deprecate();
   inline bool is_deprecated();
   inline bool CanBeDeprecated();
   // Returns a non-deprecated version of the input. If the input was not
   // deprecated, it is directly returned. Otherwise, the non-deprecated version
   // is found by re-transitioning from the root of the transition tree using the
   // descriptor array of the map. New maps (and transitions) may be created if
   // no new (more general) version exists.
   static inline Handle<Map> CurrentMapForDeprecated(Handle<Map> map);
 
   MUST_USE_RESULT MaybeObject* RawCopy(int instance_size);
   MUST_USE_RESULT MaybeObject* CopyWithPreallocatedFieldDescriptors();
   MUST_USE_RESULT MaybeObject* CopyDropDescriptors();
   MUST_USE_RESULT MaybeObject* CopyReplaceDescriptors(
       DescriptorArray* descriptors,
-      Name* name,
       TransitionFlag flag,
-      int descriptor_index);
+      Name* name = NULL,
+      SimpleTransitionFlag simple_flag = FULL_TRANSITION);
   MUST_USE_RESULT MaybeObject* CopyInstallDescriptors(
       int new_descriptor,
       DescriptorArray* descriptors);
   MUST_USE_RESULT MaybeObject* ShareDescriptor(DescriptorArray* descriptors,
                                                Descriptor* descriptor);
   MUST_USE_RESULT MaybeObject* CopyAddDescriptor(Descriptor* descriptor,
                                                  TransitionFlag flag);
   MUST_USE_RESULT MaybeObject* CopyInsertDescriptor(Descriptor* descriptor,
                                                     TransitionFlag flag);
   MUST_USE_RESULT MaybeObject* CopyReplaceDescriptor(
@@ skipping 4206 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_