Revert "Reland ^2 "[async] Expose async hooks to d8""

This reverts commit ade7f55b.

Reason for revert: https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8%20Linux/25706

Original change's description:
> Reland ^2 "[async] Expose async hooks to d8"
> 
> This is a reland of 8e0f67be
> 
> Previously landed as: 3c4d0316 / 1065818
> Previously landed as: 8e0f67be / 1088890
> 
> Original change's description:
> > [async] Expose async hooks to d8
> >
> > This implementation follows the Node.js API as a guideline.
> 
> Bug: chromium:850530
> Change-Id: I8ba22b11c80328108b197d687826ce0198420c9c
> Reviewed-on: https://chromium-review.googlesource.com/1125679
> Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
> Commit-Queue: Maya Lekova <mslekova@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#54191}

TBR=ofrobots@google.com,sergiyb@chromium.org,gsathya@chromium.org,bmeurer@chromium.org,mslekova@chromium.org

Change-Id: Id751136aee175bb3ba75edc780d62cfc9d60ed24
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:850530
Reviewed-on: https://chromium-review.googlesource.com/1125682Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54195}

BUILD.gn

@@ -3330,8 +3330,6 @@ if (is_component_build) {
 v8_executable("d8") {
   sources = [
     "$target_gen_dir/d8-js.cc",
-    "src/async-hooks-wrapper.cc",
-    "src/async-hooks-wrapper.h",
     "src/d8-console.cc",
     "src/d8-console.h",
     "src/d8.cc",

src/async-hooks-wrapper.cc

-// Copyright 2018 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "src/async-hooks-wrapper.h"
-#include "src/d8.h"
-
-namespace v8 {
-
-void AsyncHooksWrap::Enable() { enabled_ = true; }
-
-void AsyncHooksWrap::Disable() { enabled_ = false; }
-
-v8::Local<v8::Function> AsyncHooksWrap::init_function() const {
-  return init_function_.Get(isolate_);
-}
-void AsyncHooksWrap::set_init_function(v8::Local<v8::Function> value) {
-  init_function_.Reset(isolate_, value);
-}
-v8::Local<v8::Function> AsyncHooksWrap::before_function() const {
-  return before_function_.Get(isolate_);
-}
-void AsyncHooksWrap::set_before_function(v8::Local<v8::Function> value) {
-  before_function_.Reset(isolate_, value);
-}
-v8::Local<v8::Function> AsyncHooksWrap::after_function() const {
-  return after_function_.Get(isolate_);
-}
-void AsyncHooksWrap::set_after_function(v8::Local<v8::Function> value) {
-  after_function_.Reset(isolate_, value);
-}
-v8::Local<v8::Function> AsyncHooksWrap::promiseResolve_function() const {
-  return promiseResolve_function_.Get(isolate_);
-}
-void AsyncHooksWrap::set_promiseResolve_function(
-    v8::Local<v8::Function> value) {
-  promiseResolve_function_.Reset(isolate_, value);
-}
-
-static AsyncHooksWrap* UnwrapHook(
-    const v8::FunctionCallbackInfo<v8::Value>& args) {
-  Isolate* isolate = args.GetIsolate();
-  HandleScope scope(isolate);
-  Local<Object> hook = args.This();
-  Local<External> wrap = Local<External>::Cast(hook->GetInternalField(0));
-  void* ptr = wrap->Value();
-  return static_cast<AsyncHooksWrap*>(ptr);
-}
-
-static void EnableHook(const v8::FunctionCallbackInfo<v8::Value>& args) {
-  AsyncHooksWrap* wrap = UnwrapHook(args);
-  wrap->Enable();
-}
-
-static void DisableHook(const v8::FunctionCallbackInfo<v8::Value>& args) {
-  AsyncHooksWrap* wrap = UnwrapHook(args);
-  wrap->Disable();
-}
-
-async_id_t AsyncHooks::GetExecutionAsyncId() const {
-  return asyncContexts.top().execution_async_id;
-}
-
-async_id_t AsyncHooks::GetTriggerAsyncId() const {
-  return asyncContexts.top().trigger_async_id;
-}
-
-Local<Object> AsyncHooks::CreateHook(
-    const v8::FunctionCallbackInfo<v8::Value>& args) {
-  Isolate* isolate = args.GetIsolate();
-  EscapableHandleScope handle_scope(isolate);
-
-  Local<Context> currentContext = isolate->GetCurrentContext();
-
-  AsyncHooksWrap* wrap = new AsyncHooksWrap(isolate);
-
-  CHECK(args[0]->IsObject());
-
-  Local<Object> fn_obj = args[0].As<Object>();
-
-#define SET_HOOK_FN(name)                                                   \
-  Local<Value> name##_v =                                                   \
-      fn_obj                                                                \
-          ->Get(currentContext,                                             \
-                String::NewFromUtf8(isolate, #name, NewStringType::kNormal) \
-                    .ToLocalChecked())                                      \
-          .ToLocalChecked();                                                \
-  if (name##_v->IsFunction()) {                                             \
-    wrap->set_##name##_function(name##_v.As<Function>());                   \
-  }
-
-  SET_HOOK_FN(init);
-  SET_HOOK_FN(before);
-  SET_HOOK_FN(after);
-  SET_HOOK_FN(promiseResolve);
-#undef SET_HOOK_FN
-
-  async_wraps_.push_back(wrap);
-
-  Local<Object> obj = async_hooks_templ.Get(isolate)
-                          ->NewInstance(currentContext)
-                          .ToLocalChecked();
-  obj->SetInternalField(0, External::New(isolate, wrap));
-
-  return handle_scope.Escape(obj);
-}
-
-void AsyncHooks::ShellPromiseHook(PromiseHookType type, Local<Promise> promise,
-                                  Local<Value> parent) {
-  AsyncHooks* hooks = Shell::GetAsyncHooks();
-
-  HandleScope handle_scope(hooks->isolate_);
-
-  Local<Context> currentContext = hooks->isolate_->GetCurrentContext();
-
-  if (type == PromiseHookType::kInit) {
-    ++hooks->current_async_id;
-    Local<Integer> async_id =
-        Integer::New(hooks->isolate_, hooks->current_async_id);
-
-    promise->SetPrivate(currentContext,
-                        hooks->async_id_smb.Get(hooks->isolate_), async_id);
-    if (parent->IsPromise()) {
-      Local<Promise> parent_promise = parent.As<Promise>();
-      Local<Value> parent_async_id =
-          parent_promise
-              ->GetPrivate(hooks->isolate_->GetCurrentContext(),
-                           hooks->async_id_smb.Get(hooks->isolate_))
-              .ToLocalChecked();
-      promise->SetPrivate(currentContext,
-                          hooks->trigger_id_smb.Get(hooks->isolate_),
-                          parent_async_id);
-    } else {
-      CHECK(parent->IsUndefined());
-      Local<Integer> trigger_id = Integer::New(hooks->isolate_, 0);
-      promise->SetPrivate(currentContext,
-                          hooks->trigger_id_smb.Get(hooks->isolate_),
-                          trigger_id);
-    }
-  } else if (type == PromiseHookType::kBefore) {
-    AsyncContext ctx;
-    ctx.execution_async_id =
-        promise
-            ->GetPrivate(hooks->isolate_->GetCurrentContext(),
-                         hooks->async_id_smb.Get(hooks->isolate_))
-            .ToLocalChecked()
-            .As<Integer>()
-            ->Value();
-    ctx.trigger_async_id =
-        promise
-            ->GetPrivate(hooks->isolate_->GetCurrentContext(),
-                         hooks->trigger_id_smb.Get(hooks->isolate_))
-            .ToLocalChecked()
-            .As<Integer>()
-            ->Value();
-    hooks->asyncContexts.push(ctx);
-  } else if (type == PromiseHookType::kAfter) {
-    hooks->asyncContexts.pop();
-  }
-
-  for (AsyncHooksWrap* wrap : hooks->async_wraps_) {
-    PromiseHookDispatch(type, promise, parent, wrap, hooks);
-  }
-}
-
-void AsyncHooks::Initialize() {
-  HandleScope handle_scope(isolate_);
-
-  async_hook_ctor.Reset(isolate_, FunctionTemplate::New(isolate_));
-  async_hook_ctor.Get(isolate_)->SetClassName(
-      String::NewFromUtf8(isolate_, "AsyncHook", NewStringType::kNormal)
-          .ToLocalChecked());
-
-  async_hooks_templ.Reset(isolate_,
-                          async_hook_ctor.Get(isolate_)->InstanceTemplate());
-  async_hooks_templ.Get(isolate_)->SetInternalFieldCount(1);
-  async_hooks_templ.Get(isolate_)->Set(
-      String::NewFromUtf8(isolate_, "enable"),
-      FunctionTemplate::New(isolate_, EnableHook));
-  async_hooks_templ.Get(isolate_)->Set(
-      String::NewFromUtf8(isolate_, "disable"),
-      FunctionTemplate::New(isolate_, DisableHook));
-
-  async_id_smb.Reset(isolate_, Private::New(isolate_));
-  trigger_id_smb.Reset(isolate_, Private::New(isolate_));
-
-  isolate_->SetPromiseHook(ShellPromiseHook);
-}
-
-void AsyncHooks::Deinitialize() {
-  isolate_->SetPromiseHook(nullptr);
-  for (AsyncHooksWrap* wrap : async_wraps_) {
-    delete wrap;
-  }
-}
-
-void AsyncHooks::PromiseHookDispatch(PromiseHookType type,
-                                     Local<Promise> promise,
-                                     Local<Value> parent, AsyncHooksWrap* wrap,
-                                     AsyncHooks* hooks) {
-  if (!wrap->IsEnabled()) {
-    return;
-  }
-
-  HandleScope handle_scope(hooks->isolate_);
-
-  Local<Value> rcv = Undefined(hooks->isolate_);
-  Local<Value> async_id =
-      promise
-          ->GetPrivate(hooks->isolate_->GetCurrentContext(),
-                       hooks->async_id_smb.Get(hooks->isolate_))
-          .ToLocalChecked();
-  Local<Value> args[1] = {async_id};
-
-  // Sacrifice the brevity for readability and debugfulness
-  if (type == PromiseHookType::kInit) {
-    if (!wrap->init_function().IsEmpty()) {
-      Local<Value> initArgs[4] = {
-          async_id,
-          String::NewFromUtf8(hooks->isolate_, "PROMISE",
-                              NewStringType::kNormal)
-              .ToLocalChecked(),
-          promise
-              ->GetPrivate(hooks->isolate_->GetCurrentContext(),
-                           hooks->trigger_id_smb.Get(hooks->isolate_))
-              .ToLocalChecked(),
-          promise};
-      wrap->init_function()->Call(rcv, 4, initArgs);
-    }
-  } else if (type == PromiseHookType::kBefore) {
-    if (!wrap->before_function().IsEmpty()) {
-      wrap->before_function()->Call(rcv, 1, args);
-    }
-  } else if (type == PromiseHookType::kAfter) {
-    if (!wrap->after_function().IsEmpty()) {
-      wrap->after_function()->Call(rcv, 1, args);
-    }
-  } else if (type == PromiseHookType::kResolve) {
-    if (!wrap->promiseResolve_function().IsEmpty()) {
-      wrap->promiseResolve_function()->Call(rcv, 1, args);
-    }
-  }
-}
-
-}  // namespace v8

src/async-hooks-wrapper.h

-// Copyright 2018 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef V8_ASYNC_HOOKS_WRAPPER_H_
-#define V8_ASYNC_HOOKS_WRAPPER_H_
-
-#include <stack>
-
-#include "include/v8.h"
-#include "src/objects.h"
-
-namespace v8 {
-
-typedef double async_id_t;
-
-struct AsyncContext {
-  async_id_t execution_async_id;
-  async_id_t trigger_async_id;
-};
-
-class AsyncHooksWrap {
- public:
-  explicit AsyncHooksWrap(Isolate* isolate) {
-    enabled_ = false;
-    isolate_ = isolate;
-  }
-  void Enable();
-  void Disable();
-  bool IsEnabled() const { return enabled_; }
-
-  inline v8::Local<v8::Function> init_function() const;
-  inline void set_init_function(v8::Local<v8::Function> value);
-  inline v8::Local<v8::Function> before_function() const;
-  inline void set_before_function(v8::Local<v8::Function> value);
-  inline v8::Local<v8::Function> after_function() const;
-  inline void set_after_function(v8::Local<v8::Function> value);
-  inline v8::Local<v8::Function> promiseResolve_function() const;
-  inline void set_promiseResolve_function(v8::Local<v8::Function> value);
-
- private:
-  Isolate* isolate_;
-
-  Persistent<v8::Function> init_function_;
-  Persistent<v8::Function> before_function_;
-  Persistent<v8::Function> after_function_;
-  Persistent<v8::Function> promiseResolve_function_;
-
-  bool enabled_;
-};
-
-class AsyncHooks {
- public:
-  explicit AsyncHooks(Isolate* isolate) {
-    isolate_ = isolate;
-
-    AsyncContext ctx;
-    ctx.execution_async_id = 1;
-    ctx.trigger_async_id = 0;
-    asyncContexts.push(ctx);
-    current_async_id = 1;
-
-    Initialize();
-  }
-  ~AsyncHooks() { Deinitialize(); }
-
-  async_id_t GetExecutionAsyncId() const;
-  async_id_t GetTriggerAsyncId() const;
-
-  Local<Object> CreateHook(const v8::FunctionCallbackInfo<v8::Value>& args);
-
- private:
-  std::vector<AsyncHooksWrap*> async_wraps_;
-  Isolate* isolate_;
-  Persistent<FunctionTemplate> async_hook_ctor;
-  Persistent<ObjectTemplate> async_hooks_templ;
-  Persistent<Private> async_id_smb;
-  Persistent<Private> trigger_id_smb;
-
-  void Initialize();
-  void Deinitialize();
-
-  static void ShellPromiseHook(PromiseHookType type, Local<Promise> promise,
-                               Local<Value> parent);
-  static void PromiseHookDispatch(PromiseHookType type, Local<Promise> promise,
-                                  Local<Value> parent, AsyncHooksWrap* wrap,
-                                  AsyncHooks* hooks);
-
-  std::stack<AsyncContext> asyncContexts;
-  async_id_t current_async_id;
-};
-
-}  // namespace v8
-
-#endif  // V8_ASYNC_HOOKS_WRAPPER_H_

src/d8.cc

@@ -469,7 +469,6 @@ base::LazyMutex Shell::workers_mutex_;
 bool Shell::allow_new_workers_ = true;
 std::vector<Worker*> Shell::workers_;
 std::vector<ExternalizedContents> Shell::externalized_contents_;
-AsyncHooks* Shell::async_hooks_wrapper_;
 base::LazyMutex Shell::isolate_status_lock_;
 std::map<v8::Isolate*, bool> Shell::isolate_status_;
 base::LazyMutex Shell::cached_code_mutex_;
@@ -1245,32 +1244,6 @@ void Shell::RealmSharedSet(Local<String> property,
   data->realm_shared_.Reset(isolate, value);
 }
 
-// async_hooks.createHook() registers functions to be called for different
-// lifetime events of each async operation.
-void Shell::AsyncHooksCreateHook(
-    const v8::FunctionCallbackInfo<v8::Value>& args) {
-  Local<Object> wrap = async_hooks_wrapper_->CreateHook(args);
-  args.GetReturnValue().Set(wrap);
-}
-
-// async_hooks.executionAsyncId() returns the asyncId of the current execution
-// context.
-void Shell::AsyncHooksExecutionAsyncId(
-    const v8::FunctionCallbackInfo<v8::Value>& args) {
-  Isolate* isolate = args.GetIsolate();
-  HandleScope handle_scope(isolate);
-  args.GetReturnValue().Set(
-      v8::Number::New(isolate, async_hooks_wrapper_->GetExecutionAsyncId()));
-}
-
-void Shell::AsyncHooksTriggerAsyncId(
-    const v8::FunctionCallbackInfo<v8::Value>& args) {
-  Isolate* isolate = args.GetIsolate();
-  HandleScope handle_scope(isolate);
-  args.GetReturnValue().Set(
-      v8::Number::New(isolate, async_hooks_wrapper_->GetTriggerAsyncId()));
-}
-
 void WriteToFile(FILE* file, const v8::FunctionCallbackInfo<v8::Value>& args) {
   for (int i = 0; i < args.Length(); i++) {
     HandleScope handle_scope(args.GetIsolate());
@@ -1884,26 +1857,6 @@ Local<ObjectTemplate> Shell::CreateGlobalTemplate(Isolate* isolate) {
           .ToLocalChecked(),
       os_templ);
 
-  if (i::FLAG_expose_async_hooks) {
-    Local<ObjectTemplate> async_hooks_templ = ObjectTemplate::New(isolate);
-    async_hooks_templ->Set(
-        String::NewFromUtf8(isolate, "createHook", NewStringType::kNormal)
-            .ToLocalChecked(),
-        FunctionTemplate::New(isolate, AsyncHooksCreateHook));
-    async_hooks_templ->Set(
-        String::NewFromUtf8(isolate, "executionAsyncId", NewStringType::kNormal)
-            .ToLocalChecked(),
-        FunctionTemplate::New(isolate, AsyncHooksExecutionAsyncId));
-    async_hooks_templ->Set(
-        String::NewFromUtf8(isolate, "triggerAsyncId", NewStringType::kNormal)
-            .ToLocalChecked(),
-        FunctionTemplate::New(isolate, AsyncHooksTriggerAsyncId));
-    global_template->Set(
-        String::NewFromUtf8(isolate, "async_hooks", NewStringType::kNormal)
-            .ToLocalChecked(),
-        async_hooks_templ);
-  }
-
   return global_template;
 }
 
@@ -1957,10 +1910,6 @@ void Shell::Initialize(Isolate* isolate) {
       v8::Isolate::kMessageError | v8::Isolate::kMessageWarning |
           v8::Isolate::kMessageInfo | v8::Isolate::kMessageDebug |
           v8::Isolate::kMessageLog);
-
-  if (i::FLAG_expose_async_hooks) {
-    async_hooks_wrapper_ = new AsyncHooks(isolate);
-  }
 }
 
 
@@ -2109,10 +2058,6 @@ void Shell::WriteLcovData(v8::Isolate* isolate, const char* file) {
 }
 
 void Shell::OnExit(v8::Isolate* isolate) {
-  if (i::FLAG_expose_async_hooks) {
-    delete async_hooks_wrapper_;  // This uses the isolate
-  }
-
   // Dump basic block profiling data.
   if (i::BasicBlockProfiler* profiler =
           reinterpret_cast<i::Isolate*>(isolate)->basic_block_profiler()) {

src/d8.h

@@ -13,7 +13,6 @@
 #include <vector>
 
 #include "src/allocation.h"
-#include "src/async-hooks-wrapper.h"
 #include "src/base/platform/time.h"
 #include "src/string-hasher.h"
 #include "src/utils.h"
@@ -401,14 +400,6 @@ class Shell : public i::AllStatic {
                              Local<Value> value,
                              const  PropertyCallbackInfo<void>& info);
 
-  static void AsyncHooksCreateHook(
-      const v8::FunctionCallbackInfo<v8::Value>& args);
-  static void AsyncHooksExecutionAsyncId(
-      const v8::FunctionCallbackInfo<v8::Value>& args);
-  static void AsyncHooksTriggerAsyncId(
-      const v8::FunctionCallbackInfo<v8::Value>& args);
-  static AsyncHooks* GetAsyncHooks() { return async_hooks_wrapper_; }
-
   static void Print(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void PrintErr(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void Write(const v8::FunctionCallbackInfo<v8::Value>& args);
@@ -503,8 +494,6 @@ class Shell : public i::AllStatic {
   static std::vector<Worker*> workers_;
   static std::vector<ExternalizedContents> externalized_contents_;
 
-  static AsyncHooks* async_hooks_wrapper_;
-
   static void WriteIgnitionDispatchCountersFile(v8::Isolate* isolate);
   // Append LCOV coverage data to file.
   static void WriteLcovData(v8::Isolate* isolate, const char* file);

src/flag-definitions.h

@@ -863,7 +863,6 @@ DEFINE_BOOL(enable_experimental_builtins, false,
             "enable new csa-based experimental builtins")
 DEFINE_BOOL(disallow_code_generation_from_strings, false,
             "disallow eval and friends")
-DEFINE_BOOL(expose_async_hooks, false, "expose async_hooks object")
 
 // builtins.cc
 DEFINE_BOOL(allow_unsafe_function_constructor, false,

test/mjsunit/allocation-site-info.js

@@ -258,12 +258,6 @@ assertKind(elements_kind.fast, obj);
 obj = newarraycase_list_smiobj(2);
 assertKind(elements_kind.fast, obj);
 
-// Perform a gc because without it the test below can experience an
-// allocation failure at an inconvenient point. Allocation mementos get
-// cleared on gc, and they can't deliver elements kind feedback when that
-// happens.
-gc();
-
 // Case: array constructor calls with out of date feedback.
 // The boilerplate should incorporate all feedback, but the input array
 // should be minimally transitioned based on immediate need.

test/mjsunit/async-hooks/api-methods.js

-// Copyright 2018 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.
-
-// Flags: --expose-async-hooks
-
-// Check for correct API methods
-(function() {
-  assertTrue(async_hooks.hasOwnProperty('createHook'),
-    'Async hooks missing createHook method');
-  assertTrue(async_hooks.hasOwnProperty('executionAsyncId'),
-    'Async hooks missing executionAsyncId method');
-  assertTrue(async_hooks.hasOwnProperty('triggerAsyncId'),
-    'Async hooks missing triggerAsyncId method');
-
-  let ah = async_hooks.createHook({});
-  assertTrue(ah.hasOwnProperty('enable'), 'Async hooks missing enable method');
-  assertTrue(ah.hasOwnProperty('disable'),
-    'Async hooks missing disable method');
-})();
-
-// Check for correct enabling/disabling of async hooks
-(function() {
-  let storedPromise;
-  let ah = async_hooks.createHook({
-    init(asyncId, type, triggerAsyncId, resource) {
-      storedPromise = resource.promise || resource;
-    }
-  });
-  ah.enable();
-
-  let createdPromise = new Promise(function(resolve) {
-    resolve(42);
-  });
-  assertSame(storedPromise, createdPromise,
-    "Async hooks weren't enabled correctly");
-  ah.disable();
-  createdPromise = Promise.resolve(52);
-  assertNotSame(storedPromise, createdPromise,
-    "Async hooks weren't disabled correctly");
-  ah.enable();
-  createdPromise = Promise.resolve(62);
-  assertSame(storedPromise, createdPromise,
-    "Async hooks weren't enabled correctly");
-})();

test/mjsunit/async-hooks/async-await-tree.js

-// Copyright 2018 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.
-
-// Flags: --expose-async-hooks
-
-// Check for async/await asyncIds relation
-(function() {
-  let asyncIds = [], triggerIds = [];
-  let ah = async_hooks.createHook({
-    init(asyncId, type, triggerAsyncId, resource) {
-      if (type !== 'PROMISE') {
-        return;
-      }
-      asyncIds.push(asyncId);
-      triggerIds.push(triggerAsyncId);
-    },
-  });
-  ah.enable();
-
-  // Simplified version of Node.js util.promisify(setTimeout)
-  function sleep(callback, timeout) {
-    const promise = new Promise(function(resolve, reject) {
-      try {
-        setTimeout((err, ...values) => {
-          if (err) {
-            reject(err);
-          } else {
-            resolve(values[0]);
-          }
-        }, timeout);
-      } catch (err) {
-        reject(err);
-      }
-    });
-    return promise;
-  }
-
-  async function foo() {
-    await sleep(10);
-  }
-
-  foo().then(function() {
-    assertEquals(asyncIds.length, 6);
-    assertEquals(triggerIds.length, 6);
-    assertEquals(triggerIds[2], asyncIds[0]);
-    assertEquals(triggerIds[3], asyncIds[2]);
-    assertEquals(triggerIds[4], asyncIds[0]);
-    assertEquals(triggerIds[5], asyncIds[1]);
-  });
-})();

test/mjsunit/async-hooks/chained-promises.js

-// Copyright 2018 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.
-
-// Flags: --expose-async-hooks
-
-// Check for chained promises asyncIds relation
-(function() {
-  let asyncIds = [], triggerIds = [];
-  let ah = async_hooks.createHook({
-    init(asyncId, type, triggerAsyncId, resource) {
-      asyncIds.push(asyncId);
-      triggerIds.push(triggerAsyncId);
-    },
-  });
-  ah.enable();
-  let createdPromise = new Promise(function(resolve) {
-    resolve(42);
-  }).then(function() {
-    assertEquals(asyncIds.length, 2, 'Exactly 2 promises should be inited');
-    assertEquals(triggerIds.length, 2, 'Exactly 2 promises should be inited');
-    assertEquals(triggerIds[1], asyncIds[0],
-      "Parent promise asyncId doesn't correspond to child triggerAsyncId");
-  });
-})();

test/mjsunit/async-hooks/execution-order.js

-// Copyright 2018 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.
-
-// Flags: --expose-async-hooks
-
-// Check for correct execution of available hooks and asyncIds
-(function() {
-  let inited = false, resolved = false, before = false, after = false;
-  let storedAsyncId;
-  let ah = async_hooks.createHook({
-    init(asyncId, type, triggerAsyncId, resource) {
-      if (type !== 'PROMISE') {
-        return;
-      }
-      inited = true;
-      storedAsyncId = asyncId;
-    },
-    promiseResolve(asyncId) {
-      assertEquals(asyncId, storedAsyncId, 'AsyncId mismatch in resolve hook');
-      resolved = true;
-    },
-    before(asyncId) {
-      assertEquals(asyncId, storedAsyncId, 'AsyncId mismatch in before hook');
-      before = true;
-    },
-    after(asyncId) {
-      assertEquals(asyncId, storedAsyncId, 'AsyncId mismatch in after hook');
-      after = true;
-    },
-  });
-  ah.enable();
-
-  new Promise(function(resolve) {
-    resolve(42);
-  }).then(function() {
-    assertTrue(inited, "Didn't call init hook");
-    assertTrue(resolved, "Didn't call resolve hook");
-    assertTrue(before, "Didn't call before hook before the callback");
-    assertFalse(after, "Called after hook before the callback");
-  });
-})();

test/mjsunit/async-hooks/promises-async-await.js

-// Copyright 2018 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.
-
-// Flags: --expose-async-hooks
-
-// Check for executionAsyncId/triggerAsyncId when chained promises and
-// async/await are combined
-(function() {
-  let p;
-  let outerExecutionAsyncId = -1, outerTriggerAsyncId = -1;
-
-  function inIrrelevantContext(resolve) {
-    resolve(42);
-  }
-
-  function inContext1(foo) {
-    foo();
-  }
-
-  function inContext2(foo) {
-    foo();
-  }
-
-  outerExecutionAsyncId = async_hooks.executionAsyncId();
-  outerTriggerAsyncId = async_hooks.triggerAsyncId();
-
-  inContext1(() => {
-    p = new Promise(resolve => {
-      assertEquals(outerExecutionAsyncId, async_hooks.executionAsyncId());
-      assertEquals(outerTriggerAsyncId, async_hooks.triggerAsyncId());
-      inIrrelevantContext(resolve);
-    }).then(() => {
-      assertNotEquals(outerExecutionAsyncId, async_hooks.executionAsyncId());
-      assertNotEquals(outerTriggerAsyncId, async_hooks.triggerAsyncId());
-    });
-  });
-
-  inContext2(async () => {
-    assertEquals(outerExecutionAsyncId, async_hooks.executionAsyncId());
-    assertEquals(outerTriggerAsyncId, async_hooks.triggerAsyncId());
-    await p;
-    assertNotEquals(outerExecutionAsyncId, async_hooks.executionAsyncId());
-    assertNotEquals(outerTriggerAsyncId, async_hooks.triggerAsyncId());
-  });
-
-})();

test/mjsunit/es8/async-await-interleaved.js

-// Copyright 2018 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.
-
-// Check for correct interleaving of Promises and async/await
-(function () {
-  const iterations = 10;
-  let promiseCounter = iterations;
-  let awaitCounter = 0;
-
-  async function check(v) {
-    awaitCounter = v;
-    // The following checks ensure that "await" takes 3 ticks on the
-    // microtask queue. Note: this will change in the future
-    if (awaitCounter === 0) {
-      assertEquals(iterations, promiseCounter);
-    } else if (awaitCounter <= Math.floor(iterations / 3)) {
-      assertEquals(iterations - awaitCounter * 3, promiseCounter);
-    } else {
-      assertEquals(0, promiseCounter);
-    }
-  }
-
-  async function f() {
-    for (let i = 0; i < iterations; i++) {
-      await check(i);
-    }
-    return 0;
-  }
-
-  function countdown(v) {
-    promiseCounter = v;
-    if (v > 0) Promise.resolve(v - 1).then(countdown);
-  }
-
-  countdown(iterations);
-  f();
-})();