ES6 symbols: extend V8 API to support symbols

src/runtime.cc

 // 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 3880 matching lines @@
   }
 
   if (object->IsString() || object->IsNumber() || object->IsBoolean()) {
     return object->GetPrototype(isolate)->GetElement(index);
   }
 
   return object->GetElement(index);
 }
 
 
+MaybeObject* Runtime::HasObjectProperty(Isolate* isolate,
+                                        Handle<JSReceiver> object,
+                                        Handle<Object> key) {
+  HandleScope scope(isolate);
+
+  // Check if the given key is an array index.
+  uint32_t index;
+  if (key->ToArrayIndex(&index)) {
+    return isolate->heap()->ToBoolean(object->HasElement(index));
+  }
+
+  // Convert the key to a name - possibly by calling back into JavaScript.
+  Handle<Name> name;
+  if (key->IsName()) {
+    name = Handle<Name>::cast(key);
+  } else {
+    bool has_pending_exception = false;
+    Handle<Object> converted =
+        Execution::ToString(key, &has_pending_exception);
+    if (has_pending_exception) return Failure::Exception();
+    name = Handle<Name>::cast(converted);
+  }
+
+  return isolate->heap()->ToBoolean(object->HasProperty(*name));
+}
+
+
 MaybeObject* Runtime::GetObjectProperty(Isolate* isolate,
                                         Handle<Object> object,
                                         Handle<Object> key) {
   HandleScope scope(isolate);
 
   if (object->IsUndefined() || object->IsNull()) {
     Handle<Object> args[2] = { key, object };
     Handle<Object> error =
         isolate->factory()->NewTypeError("non_object_property_load",
                                          HandleVector(args, 2));
@@ skipping 405 matching lines @@
 
   if (name->AsArrayIndex(&index)) {
     return js_object->SetElement(
         index, *value, attr, kNonStrictMode, false, DEFINE_PROPERTY);
   } else {
     return js_object->SetLocalPropertyIgnoreAttributes(*name, *value, attr);
   }
 }
 
 
-MaybeObject* Runtime::ForceDeleteObjectProperty(Isolate* isolate,
-                                                Handle<JSReceiver> receiver,
-                                                Handle<Object> key) {
+MaybeObject* Runtime::DeleteObjectProperty(Isolate* isolate,
+                                           Handle<JSReceiver> receiver,
+                                           Handle<Object> key,
+                                           JSReceiver::DeleteMode mode) {
   HandleScope scope(isolate);
 
   // Check if the given key is an array index.
   uint32_t index;
   if (key->ToArrayIndex(&index)) {
     // In Firefox/SpiderMonkey, Safari and Opera you can access the
     // characters of a string using [] notation.  In the case of a
     // String object we just need to redirect the deletion to the
     // underlying string if the index is in range.  Since the
     // underlying string does nothing with the deletion, we can ignore
     // such deletions.
     if (receiver->IsStringObjectWithCharacterAt(index)) {
       return isolate->heap()->true_value();
     }
 
-    return receiver->DeleteElement(index, JSReceiver::FORCE_DELETION);
+    return receiver->DeleteElement(index, mode);
   }
 
   Handle<Name> name;
   if (key->IsName()) {
     name = Handle<Name>::cast(key);
   } else {
     // Call-back into JavaScript to convert the key to a string.
     bool has_pending_exception = false;
     Handle<Object> converted = Execution::ToString(key, &has_pending_exception);
     if (has_pending_exception) return Failure::Exception();
     name = Handle<String>::cast(converted);
   }
 
   if (name->IsString()) Handle<String>::cast(name)->TryFlatten();
-  return receiver->DeleteProperty(*name, JSReceiver::FORCE_DELETION);
+  return receiver->DeleteProperty(*name, mode);
 }
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_SetProperty) {
   NoHandleAllocation ha(isolate);
   RUNTIME_ASSERT(args.length() == 4 || args.length() == 5);
 
   Handle<Object> object = args.at<Object>(0);
   Handle<Object> key = args.at<Object>(1);
   Handle<Object> value = args.at<Object>(2);
@@ skipping 8629 matching lines @@
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags,
                                        "Runtime::PerformGC");
   }
 }
 
 
 } }  // namespace v8::internal