ES6 symbols: extend V8 API to support symbols

test/cctest/test-api.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 2160 matching lines @@
     CompileRun(
         "function cnst() { return 42; };\n"
         "Object.prototype.__defineGetter__('v8::IdentityHash', cnst);\n");
     Local<v8::Object> o1 = v8::Object::New();
     Local<v8::Object> o2 = v8::Object::New();
     CHECK_NE(o1->GetIdentityHash(), o2->GetIdentityHash());
   }
 }
 
 
+THREADED_TEST(SymbolProperties) {
+  i::FLAG_harmony_symbols = true;
+
+  LocalContext env;
+  v8::Isolate* isolate = env->GetIsolate();
+  v8::HandleScope scope(isolate);
+
+  v8::Local<v8::Object> obj = v8::Object::New();
+  v8::Local<v8::Symbol> sym1 = v8::Symbol::New(isolate);
+  v8::Local<v8::Symbol> sym2 = v8::Symbol::New(isolate, "my-symbol");
+
+  HEAP->CollectAllGarbage(i::Heap::kNoGCFlags);
+
+  // Check basic symbol functionality.
+  CHECK(sym1->IsSymbol());
+  CHECK(sym2->IsSymbol());
+  CHECK(!obj->IsSymbol());
+
+  CHECK(sym1->Equals(sym1));
+  CHECK(sym2->Equals(sym2));
+  CHECK(!sym1->Equals(sym2));
+  CHECK(!sym2->Equals(sym1));
+  CHECK(sym1->StrictEquals(sym1));
+  CHECK(sym2->StrictEquals(sym2));
+  CHECK(!sym1->StrictEquals(sym2));
+  CHECK(!sym2->StrictEquals(sym1));
+
+  CHECK(sym2->Name()->Equals(v8::String::New("my-symbol")));
+
+  v8::Local<v8::Value> sym_val = sym2;
+  CHECK(sym_val->IsSymbol());
+  CHECK(sym_val->Equals(sym2));
+  CHECK(sym_val->StrictEquals(sym2));
+  CHECK(v8::Symbol::Cast(*sym_val)->Equals(sym2));
+
+  v8::Local<v8::Value> sym_obj = v8::SymbolObject::New(isolate, sym2);
+  CHECK(sym_obj->IsSymbolObject());
+  CHECK(!sym2->IsSymbolObject());
+  CHECK(!obj->IsSymbolObject());
+  CHECK(sym_obj->Equals(sym2));
+  CHECK(!sym_obj->StrictEquals(sym2));
+  CHECK(v8::SymbolObject::Cast(*sym_obj)->Equals(sym_obj));
+  CHECK(v8::SymbolObject::Cast(*sym_obj)->SymbolValue()->Equals(sym2));
+
+   // Make sure delete of a non-existent symbol property works.
+  CHECK(obj->Delete(sym1));
+  CHECK(!obj->Has(sym1));
+
+  CHECK(obj->Set(sym1, v8::Integer::New(1503)));
+  CHECK(obj->Has(sym1));
+  CHECK_EQ(1503, obj->Get(sym1)->Int32Value());
+  CHECK(obj->Set(sym1, v8::Integer::New(2002)));
+  CHECK(obj->Has(sym1));
+  CHECK_EQ(2002, obj->Get(sym1)->Int32Value());
+  CHECK_EQ(v8::None, obj->GetPropertyAttributes(sym1));
+
+  CHECK_EQ(0, obj->GetOwnPropertyNames()->Length());
+  int num_props = obj->GetPropertyNames()->Length();
+  CHECK(obj->Set(v8::String::New("bla"), v8::Integer::New(20)));
+  CHECK_EQ(1, obj->GetOwnPropertyNames()->Length());
+  CHECK_EQ(num_props + 1, obj->GetPropertyNames()->Length());
+
+  HEAP->CollectAllGarbage(i::Heap::kNoGCFlags);
+
+  // Add another property and delete it afterwards to force the object in
+  // slow case.
+  CHECK(obj->Set(sym2, v8::Integer::New(2008)));
+  CHECK_EQ(2002, obj->Get(sym1)->Int32Value());
+  CHECK_EQ(2008, obj->Get(sym2)->Int32Value());
+  CHECK_EQ(2002, obj->Get(sym1)->Int32Value());
+  CHECK_EQ(1, obj->GetOwnPropertyNames()->Length());
+
+  CHECK(obj->Has(sym1));
+  CHECK(obj->Has(sym2));
+  CHECK(obj->Delete(sym2));
+  CHECK(obj->Has(sym1));
+  CHECK(!obj->Has(sym2));
+  CHECK_EQ(2002, obj->Get(sym1)->Int32Value());
+  CHECK_EQ(1, obj->GetOwnPropertyNames()->Length());
+}
+
+
 THREADED_TEST(HiddenProperties) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
 
   v8::Local<v8::Object> obj = v8::Object::New();
   v8::Local<v8::String> key = v8_str("api-test::hidden-key");
   v8::Local<v8::String> empty = v8_str("");
   v8::Local<v8::String> prop_name = v8_str("prop_name");
 
   HEAP->CollectAllGarbage(i::Heap::kNoGCFlags);
@@ skipping 16128 matching lines @@
   i::Semaphore* sem_;
   volatile int sem_value_;
 };
 
 
 THREADED_TEST(SemaphoreInterruption) {
   ThreadInterruptTest().RunTest();
 }
 
 #endif  // WIN32