V8 Microtask Queue & API

test/cctest/test-microtask-delivery.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
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "v8.h"
+
+#include "cctest.h"
+
+using namespace v8;
+namespace i = v8::internal;
+
+namespace {
+class HarmonyIsolate {
+ public:
+  HarmonyIsolate() {
+    i::FLAG_harmony_observation = true;
+    i::FLAG_harmony_promises = true;
+    isolate_ = Isolate::New();
+    isolate_->Enter();
+  }
+
+  ~HarmonyIsolate() {
+    isolate_->Exit();
+    isolate_->Dispose();
+  }
+
+  Isolate* GetIsolate() const { return isolate_; }
+
+ private:
+  Isolate* isolate_;
+};
+}
+
+
+TEST(MicrotaskDeliverySimple) {
+  HarmonyIsolate isolate;
+  HandleScope scope(isolate.GetIsolate());
+  LocalContext context(isolate.GetIsolate());
+  CompileRun(
+      "var ordering = [];"
+      "var resolver = {};"
+      "function handler(resolve) { resolver.resolve = resolve; }"
+      "var obj = {};"
+      "var observeOrders = [1, 4];"
+      "function observer() {"
+        "ordering.push(observeOrders.shift());"
+        "resolver.resolve();"
+      "}"
+      "var p = new Promise(handler);"
+      "p.then(function() {"
+        "ordering.push(2);"
+      "}).then(function() {"
+        "ordering.push(3);"
+        "obj.id++;"
+        "return new Promise(handler);"
+      "}).then(function() {"
+        "ordering.push(5);"
+      "}).then(function() {"
+        "ordering.push(6);"
+      "});"
+      "Object.observe(obj, observer);"
+      "obj.id = 1;");
+  CHECK_EQ(6, 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());
+  CHECK_EQ(4, CompileRun("ordering[3]")->Int32Value());
+  CHECK_EQ(5, CompileRun("ordering[4]")->Int32Value());
+  CHECK_EQ(6, CompileRun("ordering[5]")->Int32Value());
+}
+
+
+TEST(MicrotaskPerIsolateState) {
+  HarmonyIsolate isolate;
+  HandleScope scope(isolate.GetIsolate());
+  LocalContext context1(isolate.GetIsolate());
+  V8::SetAutorunMicrotasks(isolate.GetIsolate(), false);
+  CompileRun(
+      "var obj = { calls: 0 };");
+  Handle<Value> obj = CompileRun("obj");
+  {
+    LocalContext context2(isolate.GetIsolate());
+    context2->Global()->Set(String::NewFromUtf8(isolate.GetIsolate(), "obj"),
+                            obj);
+    CompileRun(
+        "var resolver = {};"
+        "new Promise(function(resolve) {"
+          "resolver.resolve = resolve;"
+        "}).then(function() {"
+          "obj.calls++;"
+        "});"
+        "(function() {"
+          "resolver.resolve();"
+        "})();");
+  }
+  {
+    LocalContext context3(isolate.GetIsolate());
+    context3->Global()->Set(String::NewFromUtf8(isolate.GetIsolate(), "obj"),
+                            obj);
+    CompileRun(
+        "var foo = { id: 1 };"
+        "Object.observe(foo, function() {"
+          "obj.calls++;"
+        "});"
+        "foo.id++;");
+  }
+  {
+    LocalContext context4(isolate.GetIsolate());
+    context4->Global()->Set(String::NewFromUtf8(isolate.GetIsolate(), "obj"),
+                            obj);
+    V8::RunMicrotasks(isolate.GetIsolate());
+    CHECK_EQ(2, CompileRun("obj.calls")->Int32Value());
+  }
+}