[strong] Implement strong property access semantics

src/objects.h

 // 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.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 1150 matching lines @@
   static inline MaybeHandle<JSReceiver> ToObject(Isolate* isolate,
                                                  Handle<Object> object);
   static MaybeHandle<JSReceiver> ToObject(Isolate* isolate,
                                           Handle<Object> object,
                                           Handle<Context> context);
 
   // Converts this to a Smi if possible.
   MUST_USE_RESULT static inline MaybeHandle<Smi> ToSmi(Isolate* isolate,
                                                        Handle<Object> object);
 
-  MUST_USE_RESULT static MaybeHandle<Object> GetProperty(LookupIterator* it);
+  MUST_USE_RESULT static MaybeHandle<Object> GetProperty(
+      LookupIterator* it, LanguageMode language_mode = SLOPPY);
 
   // Implementation of [[Put]], ECMA-262 5th edition, section 8.12.5.
   MUST_USE_RESULT static MaybeHandle<Object> SetProperty(
       Handle<Object> object, Handle<Name> name, Handle<Object> value,
       LanguageMode language_mode,
       StoreFromKeyed store_mode = MAY_BE_STORE_FROM_KEYED);
 
   MUST_USE_RESULT static MaybeHandle<Object> SetProperty(
       LookupIterator* it, Handle<Object> value, LanguageMode language_mode,
       StoreFromKeyed store_mode);
 
   MUST_USE_RESULT static MaybeHandle<Object> SetSuperProperty(
       LookupIterator* it, Handle<Object> value, LanguageMode language_mode,
       StoreFromKeyed store_mode);
 
+  MUST_USE_RESULT static MaybeHandle<Object> ReadAbsentProperty(
+      LookupIterator* it, LanguageMode language_mode);
+  MUST_USE_RESULT static MaybeHandle<Object> ReadAbsentProperty(
+      Isolate* isolate, Handle<Object> receiver, Handle<Object> name,
+      LanguageMode language_mode);
   MUST_USE_RESULT static MaybeHandle<Object> WriteToReadOnlyProperty(
       LookupIterator* it, Handle<Object> value, LanguageMode language_mode);
   MUST_USE_RESULT static MaybeHandle<Object> WriteToReadOnlyProperty(
-      Isolate* isolate, Handle<Object> reciever, Handle<Object> name,
+      Isolate* isolate, Handle<Object> receiver, Handle<Object> name,
       Handle<Object> value, LanguageMode language_mode);
   MUST_USE_RESULT static MaybeHandle<Object> RedefineNonconfigurableProperty(
       Isolate* isolate, Handle<Object> name, Handle<Object> value,
       LanguageMode language_mode);
   MUST_USE_RESULT static MaybeHandle<Object> SetDataProperty(
       LookupIterator* it, Handle<Object> value);
   MUST_USE_RESULT static MaybeHandle<Object> AddDataProperty(
       LookupIterator* it, Handle<Object> value, PropertyAttributes attributes,
       LanguageMode language_mode, StoreFromKeyed store_mode);
   MUST_USE_RESULT static inline MaybeHandle<Object> GetPropertyOrElement(
-      Handle<Object> object, Handle<Name> name);
+      Handle<Object> object, Handle<Name> name,
+      LanguageMode language_mode = SLOPPY);
   MUST_USE_RESULT static inline MaybeHandle<Object> GetProperty(
-      Isolate* isolate,
-      Handle<Object> object,
-      const char* key);
+      Isolate* isolate, Handle<Object> object, const char* key,
+      LanguageMode language_mode = SLOPPY);
   MUST_USE_RESULT static inline MaybeHandle<Object> GetProperty(
-      Handle<Object> object, Handle<Name> name);
+      Handle<Object> object, Handle<Name> name,
+      LanguageMode language_mode = SLOPPY);
 
   MUST_USE_RESULT static MaybeHandle<Object> GetPropertyWithAccessor(
-      LookupIterator* it);
+      LookupIterator* it, LanguageMode language_mode);
   MUST_USE_RESULT static MaybeHandle<Object> SetPropertyWithAccessor(
       LookupIterator* it, Handle<Object> value, LanguageMode language_mode);
 
   MUST_USE_RESULT static MaybeHandle<Object> GetPropertyWithDefinedGetter(
       Handle<Object> receiver,
       Handle<JSReceiver> getter);
   MUST_USE_RESULT static MaybeHandle<Object> SetPropertyWithDefinedSetter(
       Handle<Object> receiver,
       Handle<JSReceiver> setter,
       Handle<Object> value);
 
   MUST_USE_RESULT static inline MaybeHandle<Object> GetElement(
-      Isolate* isolate,
-      Handle<Object> object,
-      uint32_t index);
+      Isolate* isolate, Handle<Object> object, uint32_t index,
+      LanguageMode language_mode = SLOPPY);
 
   static inline Handle<Object> GetPrototypeSkipHiddenPrototypes(
       Isolate* isolate, Handle<Object> receiver);
 
   // Returns the permanent hash code associated with this object. May return
   // undefined if not yet created.
   Object* GetHash();
 
   // Returns undefined for JSObjects, but returns the hash code for simple
   // objects.  This avoids a double lookup in the cases where we know we will
@@ skipping 9581 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_