v8/test/cctest/test-microtask-delivery.cc

// Copyright 2012 the V8 project authors. All rights reserved.
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//
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#include "v8.h"

#include "cctest.h"

using namespace v8;
namespace i = v8::internal;

namespace {
class HarmonyIsolate {
 public:
  HarmonyIsolate() {
    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());
  }
}