Introduce extended mode.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 81623f6df9ad2f5d393b292055a89bd5cad9443e..b55e62784a54ad9645cad02f79e054051ff97c03 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -7263,18 +7263,19 @@ MaybeObject* JSFunction::SetPrototype(Object* value) {
 
 Object* JSFunction::RemovePrototype() {
   Context* global_context = context()->global_context();
-  Map* no_prototype_map = shared()->strict_mode()
-      ? global_context->strict_mode_function_without_prototype_map()
-      : global_context->function_without_prototype_map();
+  Map* no_prototype_map = shared()->is_classic_mode()
+      ? global_context->function_without_prototype_map()
+      : global_context->strict_mode_function_without_prototype_map();
 
   if (map() == no_prototype_map) {
     // Be idempotent.
     return this;
   }
 
-  ASSERT(!shared()->strict_mode() ||
+  ASSERT(!shared()->is_strict_or_extended_mode() ||
          map() == global_context->strict_mode_function_map());
-  ASSERT(shared()->strict_mode() || map() == global_context->function_map());
+  ASSERT(!shared()->is_classic_mode() ||
+         map() == global_context->function_map());
 
   set_map(no_prototype_map);
   set_prototype_or_initial_map(no_prototype_map->GetHeap()->the_hole_value());
@@ -10502,28 +10503,26 @@ class StringSharedKey : public HashTableKey {
  public:
   StringSharedKey(String* source,
                   SharedFunctionInfo* shared,
-                  StrictModeFlag strict_mode)
+                  LanguageMode language_mode)
       : source_(source),
         shared_(shared),
-        strict_mode_(strict_mode) { }
+        language_mode_(language_mode) { }
 
   bool IsMatch(Object* other) {
     if (!other->IsFixedArray()) return false;
     FixedArray* pair = FixedArray::cast(other);
     SharedFunctionInfo* shared = SharedFunctionInfo::cast(pair->get(0));
     if (shared != shared_) return false;
-    int strict_unchecked = Smi::cast(pair->get(2))->value();
-    ASSERT(strict_unchecked == kStrictMode ||
-           strict_unchecked == kNonStrictMode);
-    StrictModeFlag strict_mode = static_cast<StrictModeFlag>(strict_unchecked);
-    if (strict_mode != strict_mode_) return false;
+    int language_unchecked = Smi::cast(pair->get(2))->value();
+    LanguageMode language_mode = static_cast<LanguageMode>(language_unchecked);
+    if (language_mode != language_mode_) return false;
     String* source = String::cast(pair->get(1));
     return source->Equals(source_);
   }
 
   static uint32_t StringSharedHashHelper(String* source,
                                          SharedFunctionInfo* shared,
-                                         StrictModeFlag strict_mode) {
+                                         LanguageMode language_mode) {
     uint32_t hash = source->Hash();
     if (shared->HasSourceCode()) {
       // Instead of using the SharedFunctionInfo pointer in the hash
@@ -10533,25 +10532,27 @@ class StringSharedKey : public HashTableKey {
       // collection.
       Script* script = Script::cast(shared->script());
       hash ^= String::cast(script->source())->Hash();
-      if (strict_mode == kStrictMode) hash ^= 0x8000;
+      if (language_mode == STRICT_MODE) hash ^= 0x8000;
+      if (language_mode == EXTENDED_MODE) hash ^= 0x0080;
       hash += shared->start_position();
     }
     return hash;
   }
 
   uint32_t Hash() {
-    return StringSharedHashHelper(source_, shared_, strict_mode_);
+    return StringSharedHashHelper(source_, shared_, language_mode_);
   }
 
   uint32_t HashForObject(Object* obj) {
     FixedArray* pair = FixedArray::cast(obj);
     SharedFunctionInfo* shared = SharedFunctionInfo::cast(pair->get(0));
     String* source = String::cast(pair->get(1));
-    int strict_unchecked = Smi::cast(pair->get(2))->value();
-    ASSERT(strict_unchecked == kStrictMode ||
-           strict_unchecked == kNonStrictMode);
-    StrictModeFlag strict_mode = static_cast<StrictModeFlag>(strict_unchecked);
-    return StringSharedHashHelper(source, shared, strict_mode);
+    int language_unchecked = Smi::cast(pair->get(2))->value();
+    ASSERT(language_unchecked == CLASSIC_MODE ||
+           language_unchecked == STRICT_MODE ||
+           language_unchecked == EXTENDED_MODE);
+    LanguageMode language_mode = static_cast<LanguageMode>(language_unchecked);
+    return StringSharedHashHelper(source, shared, language_mode);
   }
 
   MUST_USE_RESULT MaybeObject* AsObject() {
@@ -10562,14 +10563,14 @@ class StringSharedKey : public HashTableKey {
     FixedArray* pair = FixedArray::cast(obj);
     pair->set(0, shared_);
     pair->set(1, source_);
-    pair->set(2, Smi::FromInt(strict_mode_));
+    pair->set(2, Smi::FromInt(language_mode_));
     return pair;
   }
 
  private:
   String* source_;
   SharedFunctionInfo* shared_;
-  StrictModeFlag strict_mode_;
+  LanguageMode language_mode_;
 };
 
 
@@ -11724,8 +11725,8 @@ Object* CompilationCacheTable::Lookup(String* src) {
 
 Object* CompilationCacheTable::LookupEval(String* src,
                                           Context* context,
-                                          StrictModeFlag strict_mode) {
-  StringSharedKey key(src, context->closure()->shared(), strict_mode);
+                                          LanguageMode language_mode) {
+  StringSharedKey key(src, context->closure()->shared(), language_mode);
   int entry = FindEntry(&key);
   if (entry == kNotFound) return GetHeap()->undefined_value();
   return get(EntryToIndex(entry) + 1);
@@ -11763,7 +11764,7 @@ MaybeObject* CompilationCacheTable::PutEval(String* src,
                                             SharedFunctionInfo* value) {
   StringSharedKey key(src,
                       context->closure()->shared(),
-                      value->strict_mode_flag());
+                      value->language_mode());
   Object* obj;
   { MaybeObject* maybe_obj = EnsureCapacity(1, &key);
     if (!maybe_obj->ToObject(&obj)) return maybe_obj;