ElementsAccessor::Delete() maybehandlified.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/230733003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20631 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/elements.cc

@@ -754,7 +754,7 @@ class ElementsAccessorBase : public ElementsAccessor {
     UNIMPLEMENTED();
   }
 
-  MUST_USE_RESULT virtual Handle<Object> Delete(
+  MUST_USE_RESULT virtual MaybeHandle<Object> Delete(
       Handle<JSObject> obj,
       uint32_t key,
       JSReceiver::DeleteMode mode) V8_OVERRIDE = 0;
@@ -1038,7 +1038,7 @@ class FastElementsAccessor
     return isolate->factory()->true_value();
   }
 
-  virtual Handle<Object> Delete(
+  virtual MaybeHandle<Object> Delete(
       Handle<JSObject> obj,
       uint32_t key,
       JSReceiver::DeleteMode mode) V8_FINAL V8_OVERRIDE {
@@ -1373,7 +1373,7 @@ class TypedElementsAccessor
     return obj;
   }
 
-  MUST_USE_RESULT virtual Handle<Object> Delete(
+  MUST_USE_RESULT virtual MaybeHandle<Object> Delete(
       Handle<JSObject> obj,
       uint32_t key,
       JSReceiver::DeleteMode mode) V8_FINAL V8_OVERRIDE {
@@ -1476,59 +1476,46 @@ class DictionaryElementsAccessor
     return length_object;
   }
 
-  MUST_USE_RESULT static MaybeObject* DeleteCommon(
+  MUST_USE_RESULT static MaybeHandle<Object> DeleteCommon(
-      JSObject* obj,
-      uint32_t key,
-      JSReceiver::DeleteMode mode) {
-    Isolate* isolate = obj->GetIsolate();
-    Heap* heap = isolate->heap();
-    FixedArray* backing_store = FixedArray::cast(obj->elements());
-    bool is_arguments =
-        (obj->GetElementsKind() == SLOPPY_ARGUMENTS_ELEMENTS);
-    if (is_arguments) {
-      backing_store = FixedArray::cast(backing_store->get(1));
-    }
-    SeededNumberDictionary* dictionary =
-        SeededNumberDictionary::cast(backing_store);
-    int entry = dictionary->FindEntry(key);
-    if (entry != SeededNumberDictionary::kNotFound) {
-      Object* result = dictionary->DeleteProperty(entry, mode);
-      if (result == heap->false_value()) {
-        if (mode == JSObject::STRICT_DELETION) {
-          // Deleting a non-configurable property in strict mode.
-          HandleScope scope(isolate);
-          Handle<Object> holder(obj, isolate);
-          Handle<Object> name = isolate->factory()->NewNumberFromUint(key);
-          Handle<Object> args[2] = { name, holder };
-          Handle<Object> error =
-              isolate->factory()->NewTypeError("strict_delete_property",
-                                               HandleVector(args, 2));
-          return isolate->Throw(*error);
-        }
-        return heap->false_value();
-      }
-      MaybeObject* maybe_elements = dictionary->Shrink(key);
-      FixedArray* new_elements = NULL;
-      if (!maybe_elements->To(&new_elements)) {
-        return maybe_elements;
-      }
-      if (is_arguments) {
-        FixedArray::cast(obj->elements())->set(1, new_elements);
-      } else {
-        obj->set_elements(new_elements);
-      }
-    }
-    return heap->true_value();
-  }
-
-  // TODO(ishell): Temporary wrapper until handlified.
-  MUST_USE_RESULT static Handle<Object> DeleteCommon(
       Handle<JSObject> obj,
       uint32_t key,
       JSReceiver::DeleteMode mode) {
-    CALL_HEAP_FUNCTION(obj->GetIsolate(),
+    Isolate* isolate = obj->GetIsolate();
-                       DeleteCommon(*obj, key, mode),
+    Handle<FixedArray> backing_store(FixedArray::cast(obj->elements()),
-                       Object);
+                                     isolate);
+    bool is_arguments =
+        (obj->GetElementsKind() == SLOPPY_ARGUMENTS_ELEMENTS);
+    if (is_arguments) {
+      backing_store = handle(FixedArray::cast(backing_store->get(1)), isolate);
+    }
+    Handle<SeededNumberDictionary> dictionary =
+        Handle<SeededNumberDictionary>::cast(backing_store);
+    int entry = dictionary->FindEntry(key);
+    if (entry != SeededNumberDictionary::kNotFound) {
+      Handle<Object> result =
+          SeededNumberDictionary::DeleteProperty(dictionary, entry, mode);
+      if (*result == *isolate->factory()->false_value()) {
+        if (mode == JSObject::STRICT_DELETION) {
+          // Deleting a non-configurable property in strict mode.
+          Handle<Object> name = isolate->factory()->NewNumberFromUint(key);
+          Handle<Object> args[2] = { name, obj };
+          Handle<Object> error =
+              isolate->factory()->NewTypeError("strict_delete_property",
+                                               HandleVector(args, 2));
+          return isolate->Throw<Object>(error);
+        }
+        return isolate->factory()->false_value();
+      }
+      Handle<FixedArray> new_elements =
+          SeededNumberDictionary::Shrink(dictionary, key);
+
+      if (is_arguments) {
+        FixedArray::cast(obj->elements())->set(1, *new_elements);
+      } else {
+        obj->set_elements(*new_elements);
+      }
+    }
+    return isolate->factory()->true_value();
   }
 
   static void CopyElementsImpl(Handle<FixedArrayBase> from,
@@ -1546,7 +1533,7 @@ class DictionaryElementsAccessor
   friend class ElementsAccessorBase<DictionaryElementsAccessor,
                                     ElementsKindTraits<DICTIONARY_ELEMENTS> >;
 
-  MUST_USE_RESULT virtual Handle<Object> Delete(
+  MUST_USE_RESULT virtual MaybeHandle<Object> Delete(
       Handle<JSObject> obj,
       uint32_t key,
       JSReceiver::DeleteMode mode) V8_FINAL V8_OVERRIDE {
@@ -1747,7 +1734,7 @@ class SloppyArgumentsElementsAccessor : public ElementsAccessorBase<
     return obj;
   }
 
-  MUST_USE_RESULT virtual Handle<Object> Delete(
+  MUST_USE_RESULT virtual MaybeHandle<Object> Delete(
       Handle<JSObject> obj,
       uint32_t key,
       JSReceiver::DeleteMode mode) V8_FINAL V8_OVERRIDE {

src/elements.h

@@ -161,7 +161,7 @@ class ElementsAccessor {
       int length) = 0;
 
   // Deletes an element in an object, returning a new elements backing store.
-  MUST_USE_RESULT virtual Handle<Object> Delete(
+  MUST_USE_RESULT virtual MaybeHandle<Object> Delete(
       Handle<JSObject> holder,
       uint32_t key,
       JSReceiver::DeleteMode mode) = 0;

src/objects.cc

@@ -5189,8 +5189,9 @@ Handle<Object> JSObject::DeletePropertyWithInterceptor(Handle<JSObject> object,
 }
 
 
-Handle<Object> JSObject::DeleteElementWithInterceptor(Handle<JSObject> object,
+MaybeHandle<Object> JSObject::DeleteElementWithInterceptor(
-                                                      uint32_t index) {
+    Handle<JSObject> object,
+    uint32_t index) {
   Isolate* isolate = object->GetIsolate();
   Factory* factory = isolate->factory();
 
@@ -5215,16 +5216,15 @@ Handle<Object> JSObject::DeleteElementWithInterceptor(Handle<JSObject> object,
     // Rebox CustomArguments::kReturnValueOffset before returning.
     return handle(*result_internal, isolate);
   }
-  Handle<Object> delete_result = object->GetElementsAccessor()->Delete(
+  MaybeHandle<Object> delete_result = object->GetElementsAccessor()->Delete(
       object, index, NORMAL_DELETION);
-  RETURN_HANDLE_IF_SCHEDULED_EXCEPTION(isolate, Object);
   return delete_result;
 }
 
 
-Handle<Object> JSObject::DeleteElement(Handle<JSObject> object,
+MaybeHandle<Object> JSObject::DeleteElement(Handle<JSObject> object,
-                                       uint32_t index,
+                                            uint32_t index,
-                                       DeleteMode mode) {
+                                            DeleteMode mode) {
   Isolate* isolate = object->GetIsolate();
   Factory* factory = isolate->factory();
 
@@ -5271,12 +5271,14 @@ Handle<Object> JSObject::DeleteElement(Handle<JSObject> object,
   }
 
   // Skip interceptor if forcing deletion.
-  Handle<Object> result;
+  MaybeHandle<Object> maybe_result;
   if (object->HasIndexedInterceptor() && mode != FORCE_DELETION) {
-    result = DeleteElementWithInterceptor(object, index);
+    maybe_result = DeleteElementWithInterceptor(object, index);
   } else {
-    result = object->GetElementsAccessor()->Delete(object, index, mode);
+    maybe_result = object->GetElementsAccessor()->Delete(object, index, mode);
   }
+  Handle<Object> result;
+  ASSIGN_RETURN_ON_EXCEPTION(isolate, result, maybe_result, Object);
 
   if (should_enqueue_change_record && !HasLocalElement(object, index)) {
     Handle<String> name = factory->Uint32ToString(index);
@@ -5287,9 +5289,9 @@ Handle<Object> JSObject::DeleteElement(Handle<JSObject> object,
 }
 
 
-Handle<Object> JSObject::DeleteProperty(Handle<JSObject> object,
+MaybeHandle<Object> JSObject::DeleteProperty(Handle<JSObject> object,
-                                        Handle<Name> name,
+                                             Handle<Name> name,
-                                        DeleteMode mode) {
+                                             DeleteMode mode) {
   Isolate* isolate = object->GetIsolate();
   // ECMA-262, 3rd, 8.6.2.5
   ASSERT(name->IsName());
@@ -14256,13 +14258,28 @@ template void Dictionary<SeededNumberDictionaryShape, uint32_t>::CopyKeysTo(
 template Object* Dictionary<NameDictionaryShape, Name*>::DeleteProperty(
     int, JSObject::DeleteMode);
 
+template Handle<Object> Dictionary<NameDictionaryShape, Name*>::DeleteProperty(
+    Handle<Dictionary<NameDictionaryShape, Name*> >,
+    int,
+    JSObject::DeleteMode);
+
 template Object* Dictionary<SeededNumberDictionaryShape, uint32_t>::
     DeleteProperty(int, JSObject::DeleteMode);
 
+template Handle<Object>
+Dictionary<SeededNumberDictionaryShape, uint32_t>::DeleteProperty(
+    Handle<Dictionary<SeededNumberDictionaryShape, uint32_t> >,
+    int,
+    JSObject::DeleteMode);
+
 template MaybeObject* Dictionary<NameDictionaryShape, Name*>::Shrink(Name* n);
 
 template MaybeObject* Dictionary<SeededNumberDictionaryShape, uint32_t>::Shrink(
     uint32_t);
+template Handle<FixedArray>
+Dictionary<SeededNumberDictionaryShape, uint32_t>::Shrink(
+    Handle<Dictionary<SeededNumberDictionaryShape, uint32_t> >,
+    uint32_t);
 
 template void Dictionary<NameDictionaryShape, Name*>::CopyKeysTo(
     FixedArray*,
@@ -15261,6 +15278,18 @@ MaybeObject* Dictionary<Shape, Key>::EnsureCapacity(int n, Key key) {
 }
 
 
+// TODO(ishell): Temporary wrapper until handlified.
+template<typename Shape, typename Key>
+Handle<Object> Dictionary<Shape, Key>::DeleteProperty(
+    Handle<Dictionary<Shape, Key> > dictionary,
+    int entry,
+    JSObject::DeleteMode mode) {
+  CALL_HEAP_FUNCTION(dictionary->GetIsolate(),
+                     dictionary->DeleteProperty(entry, mode),
+                     Object);
+}
+
+
 template<typename Shape, typename Key>
 Object* Dictionary<Shape, Key>::DeleteProperty(int entry,
                                                JSReceiver::DeleteMode mode) {
@@ -15276,6 +15305,17 @@ Object* Dictionary<Shape, Key>::DeleteProperty(int entry,
 }
 
 
+// TODO(ishell): Temporary wrapper until handlified.
+template<typename Shape, typename Key>
+Handle<FixedArray> Dictionary<Shape, Key>::Shrink(
+    Handle<Dictionary<Shape, Key> > dictionary,
+    Key key) {
+  CALL_HEAP_FUNCTION(dictionary->GetIsolate(),
+                     dictionary->Shrink(key),
+                     FixedArray);
+}
+
+
 template<typename Shape, typename Key>
 MaybeObject* Dictionary<Shape, Key>::Shrink(Key key) {
   return HashTable<Shape, Key>::Shrink(key);

src/objects.h

@@ -2925,9 +2925,10 @@ class JSObject: public JSReceiver {
                               Handle<Object> value,
                               PropertyAttributes attributes);
 
-  static Handle<Object> DeleteProperty(Handle<JSObject> object,
+  MUST_USE_RESULT static MaybeHandle<Object> DeleteProperty(
-                                       Handle<Name> name,
+      Handle<JSObject> object,
-                                       DeleteMode mode);
+      Handle<Name> name,
+      DeleteMode mode);
   static Handle<Object> DeletePropertyPostInterceptor(Handle<JSObject> object,
                                                       Handle<Name> name,
                                                       DeleteMode mode);
@@ -2939,11 +2940,13 @@ class JSObject: public JSReceiver {
                                                  Handle<Name> name,
                                                  DeleteMode mode);
 
-  static Handle<Object> DeleteElement(Handle<JSObject> object,
+  MUST_USE_RESULT static MaybeHandle<Object> DeleteElement(
-                                      uint32_t index,
+      Handle<JSObject> object,
-                                      DeleteMode mode);
+      uint32_t index,
-  static Handle<Object> DeleteElementWithInterceptor(Handle<JSObject> object,
+      DeleteMode mode);
-                                                     uint32_t index);
+  MUST_USE_RESULT static MaybeHandle<Object> DeleteElementWithInterceptor(
+      Handle<JSObject> object,
+      uint32_t index);
 
   bool ReferencesObjectFromElements(FixedArray* elements,
                                     ElementsKind kind,
@@ -3974,9 +3977,18 @@ class Dictionary: public HashTable<Shape, Key> {
 
   // Delete a property from the dictionary.
   Object* DeleteProperty(int entry, JSObject::DeleteMode mode);
+  // TODO(ishell): Temporary wrapper until handlified.
+  static Handle<Object> DeleteProperty(
+      Handle<Dictionary<Shape, Key> > dictionary,
+      int entry,
+      JSObject::DeleteMode mode);
 
   // Attempt to shrink the dictionary after deletion of key.
   MUST_USE_RESULT MaybeObject* Shrink(Key key);
+  // TODO(ishell): Temporary wrapper until handlified.
+  MUST_USE_RESULT static Handle<FixedArray> Shrink(
+      Handle<Dictionary<Shape, Key> > dictionary,
+      Key key);
 
   // Returns the number of elements in the dictionary filtering out properties
   // with the specified attributes.