Delivery logic for Object.observe

test/cctest/test-object-observe.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 42 matching lines @@
 
 TEST(PerIsolateState) {
   HarmonyIsolate isolate;
   HandleScope scope;
   LocalContext context1;
   CompileRun(
       "var count = 0;"
       "var calls = 0;"
       "var observer = function(records) { count = records.length; calls++ };"
       "var obj = {};"
-      "Object.observe(obj, observer);"
-      "Object.notify(obj, {type: 'a'});");
+      "Object.observe(obj, observer);");
   Handle<Value> observer = CompileRun("observer");
   Handle<Value> obj = CompileRun("obj");
+  Handle<Value> notify_fun1 = CompileRun(
+      "(function() { Object.notify(obj, {type: 'a'}); })");
+  Handle<Value> notify_fun2;
   {
     LocalContext context2;
     context2->Global()->Set(String::New("obj"), obj);
-    CompileRun("Object.notify(obj, {type: 'b'});");
+    notify_fun2 = CompileRun(
+        "(function() { Object.notify(obj, {type: 'b'}); })");
   }
+  Handle<Value> notify_fun3;
   {
     LocalContext context3;
     context3->Global()->Set(String::New("obj"), obj);
-    CompileRun("Object.notify(obj, {type: 'c'});");
+    notify_fun3 = CompileRun(
+        "(function() { Object.notify(obj, {type: 'c'}); })");
   }
   {
     LocalContext context4;
     context4->Global()->Set(String::New("observer"), observer);
-    CompileRun("Object.deliverChangeRecords(observer)");
+    context4->Global()->Set(String::New("fun1"), notify_fun1);
+    context4->Global()->Set(String::New("fun2"), notify_fun2);
+    context4->Global()->Set(String::New("fun3"), notify_fun3);
+    CompileRun("fun1(); fun2(); fun3(); Object.deliverChangeRecords(observer)");
   }
   CHECK_EQ(1, CompileRun("calls")->Int32Value());
   CHECK_EQ(3, CompileRun("count")->Int32Value());
 }
+
+TEST(EndOfMicrotaskDelivery) {
+  HarmonyIsolate isolate;
+  HandleScope scope;
+  LocalContext context;
+  CompileRun(
+      "var obj = {};"
+      "var count = 0;"
+      "var observer = function(records) { count = records.length };"
+      "Object.observe(obj, observer);"
+      "Object.notify(obj, {type: 'a'});");
+  CHECK_EQ(1, CompileRun("count")->Int32Value());
+}
+
+TEST(DeliveryOrdering) {
+  HarmonyIsolate isolate;
+  HandleScope scope;
+  LocalContext context;
+  CompileRun(
+      "var obj1 = {};"
+      "var obj2 = {};"
+      "var ordering = [];"
+      "function observer2() { ordering.push(2); };"
+      "function observer1() { ordering.push(1); };"
+      "function observer3() { ordering.push(3); };"
+      "Object.observe(obj1, observer1);"
+      "Object.observe(obj1, observer2);"
+      "Object.observe(obj1, observer3);"
+      "Object.notify(obj1, {type: 'a'});");
+  CHECK_EQ(3, CompileRun("ordering.length")->Int32Value());
+  CHECK_EQ(1, CompileRun("ordering[0]")->Int32Value());
+  CHECK_EQ(2, CompileRun("ordering[1]")->Int32Value());
+  CHECK_EQ(3, CompileRun("ordering[2]")->Int32Value());
+  CompileRun(
+      "ordering = [];"
+      "Object.observe(obj2, observer3);"
+      "Object.observe(obj2, observer2);"
+      "Object.observe(obj2, observer1);"
+      "Object.notify(obj2, {type: 'b'});");
+  CHECK_EQ(3, CompileRun("ordering.length")->Int32Value());
+  CHECK_EQ(1, CompileRun("ordering[0]")->Int32Value());
+  CHECK_EQ(2, CompileRun("ordering[1]")->Int32Value());
+  CHECK_EQ(3, CompileRun("ordering[2]")->Int32Value());
+}
+
+TEST(DeliveryOrderingReentrant) {
+  HarmonyIsolate isolate;
+  HandleScope scope;
+  LocalContext context;
+  CompileRun(
+      "var obj = {};"
+      "var reentered = false;"
+      "var ordering = [];"
+      "function observer1() { ordering.push(1); };"
+      "function observer2() {"
+      "  if (!reentered) {"
+      "    Object.notify(obj, {type: 'b'});"
+      "    reentered = true;"
+      "  }"
+      "  ordering.push(2);"
+      "};"
+      "function observer3() { ordering.push(3); };"
+      "Object.observe(obj, observer1);"
+      "Object.observe(obj, observer2);"
+      "Object.observe(obj, observer3);"
+      "Object.notify(obj, {type: 'a'});");
+  CHECK_EQ(5, CompileRun("ordering.length")->Int32Value());
+  CHECK_EQ(1, CompileRun("ordering[0]")->Int32Value());
+  CHECK_EQ(2, CompileRun("ordering[1]")->Int32Value());
+  CHECK_EQ(3, CompileRun("ordering[2]")->Int32Value());
+  // Note that we re-deliver to observers 1 and 2, while observer3
+  // already received the second record during the first round.
+  CHECK_EQ(1, CompileRun("ordering[3]")->Int32Value());
+  CHECK_EQ(2, CompileRun("ordering[1]")->Int32Value());
+}