// Copyright Joyent, Inc. and other Node contributors.

//

// Permission is hereby granted, free of charge, to any person obtaining a

// copy of this software and associated documentation files (the

// "Software"), to deal in the Software without restriction, including

// without limitation the rights to use, copy, modify, merge, publish,

// distribute, sublicense, and/or sell copies of the Software, and to permit

// persons to whom the Software is furnished to do so, subject to the

// following conditions:

//

// The above copyright notice and this permission notice shall be included

// in all copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN

// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

// USE OR OTHER DEALINGS IN THE SOFTWARE.

#include "async-wrap.h"

#include "async-wrap-inl.h"

#include "env.h"

#include "env-inl.h"

#include "util.h"

#include "util-inl.h"

#include "uv.h"

#include "v8.h"

#include "v8-profiler.h"

using v8::Array;

using v8::ArrayBuffer;

using v8::Context;

using v8::Float64Array;

using v8::Function;

using v8::FunctionCallbackInfo;

using v8::FunctionTemplate;

using v8::HandleScope;

using v8::HeapProfiler;

using v8::Integer;

using v8::Isolate;

using v8::Local;

using v8::MaybeLocal;

using v8::Number;

using v8::Object;

using v8::ObjectTemplate;

using v8::Promise;

using v8::PromiseHookType;

using v8::PropertyCallbackInfo;

using v8::RetainedObjectInfo;

using v8::String;

using v8::Symbol;

using v8::TryCatch;

using v8::Uint32Array;

using v8::Value;

using AsyncHooks = node::Environment::AsyncHooks;

namespace node {

static const char* const provider_names[] = {

#define V(PROVIDER) \

#PROVIDER,

NODE_ASYNC_PROVIDER_TYPES(V)

#undef V

};

// Report correct information in a heapdump.

class RetainedAsyncInfo: public RetainedObjectInfo {

public:

explicit RetainedAsyncInfo(uint16_t class_id, AsyncWrap* wrap);

void Dispose() override;

bool IsEquivalent(RetainedObjectInfo* other) override;

intptr_t GetHash() override;

const char* GetLabel() override;

intptr_t GetSizeInBytes() override;

private:

const char* label_;

const AsyncWrap* wrap_;

const int length_;

};

RetainedAsyncInfo::RetainedAsyncInfo(uint16_t class_id, AsyncWrap* wrap)

: label_(provider_names[class_id - NODE_ASYNC_ID_OFFSET]),

wrap_(wrap),

length_(wrap->self_size()) {

}

void RetainedAsyncInfo::Dispose() {

delete this;

}

bool RetainedAsyncInfo::IsEquivalent(RetainedObjectInfo* other) {

return label_ == other->GetLabel() &&

wrap_ == static_cast<RetainedAsyncInfo*>(other)->wrap_;

}

intptr_t RetainedAsyncInfo::GetHash() {

return reinterpret_cast<intptr_t>(wrap_);

}

const char* RetainedAsyncInfo::GetLabel() {

return label_;

}

intptr_t RetainedAsyncInfo::GetSizeInBytes() {

return length_;

}

RetainedObjectInfo* WrapperInfo(uint16_t class_id, Local<Value> wrapper) {

// No class_id should be the provider type of NONE.

CHECK_GT(class_id, NODE_ASYNC_ID_OFFSET);

// And make sure the class_id doesn't extend past the last provider.

CHECK_LE(class_id - NODE_ASYNC_ID_OFFSET, AsyncWrap::PROVIDERS_LENGTH);

CHECK(wrapper->IsObject());

CHECK(!wrapper.IsEmpty());

Local<Object> object = wrapper.As<Object>();

CHECK_GT(object->InternalFieldCount(), 0);

AsyncWrap* wrap = Unwrap<AsyncWrap>(object);

CHECK_NE(nullptr, wrap);

return new RetainedAsyncInfo(class_id, wrap);

}

// end RetainedAsyncInfo

static void DestroyIdsCb(uv_timer_t* handle) {

Environment* env = Environment::from_destroy_ids_timer_handle(handle);

HandleScope handle_scope(env->isolate());

Context::Scope context_scope(env->context());

Local<Function> fn = env->async_hooks_destroy_function();

TryCatch try_catch(env->isolate());

do {

std::vector<double> destroy_ids_list;

destroy_ids_list.swap(*env->destroy_ids_list());

for (auto current_id : destroy_ids_list) {

// Want each callback to be cleaned up after itself, instead of cleaning

// them all up after the while() loop completes.

HandleScope scope(env->isolate());

Local<Value> argv = Number::New(env->isolate(), current_id);

MaybeLocal<Value> ret = fn->Call(

env->context(), Undefined(env->isolate()), 1, &argv);

if (ret.IsEmpty()) {

ClearFatalExceptionHandlers(env);

FatalException(env->isolate(), try_catch);

}

}

} while (!env->destroy_ids_list()->empty());

}

static void PushBackDestroyId(Environment* env, double id) {

if (env->async_hooks()->fields()[AsyncHooks::kDestroy] == 0)

return;

if (env->destroy_ids_list()->empty())

uv_timer_start(env->destroy_ids_timer_handle(), DestroyIdsCb, 0, 0);

env->destroy_ids_list()->push_back(id);

}

bool DomainEnter(Environment* env, Local<Object> object) {

Local<Value> domain_v = object->Get(env->domain_string());

if (domain_v->IsObject()) {

Local<Object> domain = domain_v.As<Object>();

if (domain->Get(env->disposed_string())->IsTrue())

return true;

Local<Value> enter_v = domain->Get(env->enter_string());

if (enter_v->IsFunction()) {

if (enter_v.As<Function>()->Call(domain, 0, nullptr).IsEmpty()) {

FatalError("node::AsyncWrap::MakeCallback",

"domain enter callback threw, please report this");

}

}

}

return false;

}

bool DomainExit(Environment* env, v8::Local<v8::Object> object) {

Local<Value> domain_v = object->Get(env->domain_string());

if (domain_v->IsObject()) {

Local<Object> domain = domain_v.As<Object>();

if (domain->Get(env->disposed_string())->IsTrue())

return true;

Local<Value> exit_v = domain->Get(env->exit_string());

if (exit_v->IsFunction()) {

if (exit_v.As<Function>()->Call(domain, 0, nullptr).IsEmpty()) {

FatalError("node::AsyncWrap::MakeCallback",

"domain exit callback threw, please report this");

}

}

}

return false;

}

static bool PreCallbackExecution(AsyncWrap* wrap, bool run_domain_cbs) {

if (wrap->env()->using_domains() && run_domain_cbs) {

bool is_disposed = DomainEnter(wrap->env(), wrap->object());

if (is_disposed)

return false;

}

return AsyncWrap::EmitBefore(wrap->env(), wrap->get_id());

}

bool AsyncWrap::EmitBefore(Environment* env, double async_id) {

AsyncHooks* async_hooks = env->async_hooks();

if (async_hooks->fields()[AsyncHooks::kBefore] > 0) {

Local<Value> uid = Number::New(env->isolate(), async_id);

Local<Function> fn = env->async_hooks_before_function();

TryCatch try_catch(env->isolate());

MaybeLocal<Value> ar = fn->Call(

env->context(), Undefined(env->isolate()), 1, &uid);

if (ar.IsEmpty()) {

ClearFatalExceptionHandlers(env);

FatalException(env->isolate(), try_catch);

return false;

}

}

return true;

}

static bool PostCallbackExecution(AsyncWrap* wrap, bool run_domain_cbs) {

if (!AsyncWrap::EmitAfter(wrap->env(), wrap->get_id()))

return false;

if (wrap->env()->using_domains() && run_domain_cbs) {

bool is_disposed = DomainExit(wrap->env(), wrap->object());

if (is_disposed)

return false;

}

return true;

}

bool AsyncWrap::EmitAfter(Environment* env, double async_id) {

AsyncHooks* async_hooks = env->async_hooks();

// If the callback failed then the after() hooks will be called at the end

// of _fatalException().

if (async_hooks->fields()[AsyncHooks::kAfter] > 0) {

Local<Value> uid = Number::New(env->isolate(), async_id);

Local<Function> fn = env->async_hooks_after_function();

TryCatch try_catch(env->isolate());

MaybeLocal<Value> ar = fn->Call(

env->context(), Undefined(env->isolate()), 1, &uid);

if (ar.IsEmpty()) {

ClearFatalExceptionHandlers(env);

FatalException(env->isolate(), try_catch);

return false;

}

}

return true;

}

class PromiseWrap : public AsyncWrap {

public:

PromiseWrap(Environment* env, Local<Object> object, bool silent)

: AsyncWrap(env, object, PROVIDER_PROMISE, silent) {

MakeWeak(this);

}

size_t self_size() const override { return sizeof(*this); }

static constexpr int kPromiseField = 1;

static constexpr int kParentIdField = 2;

static constexpr int kInternalFieldCount = 3;

static PromiseWrap* New(Environment* env,

Local<Promise> promise,

PromiseWrap* parent_wrap,

bool silent);

static void GetPromise(Local<String> property,

const PropertyCallbackInfo<Value>& info);

static void GetParentId(Local<String> property,

const PropertyCallbackInfo<Value>& info);

};

PromiseWrap* PromiseWrap::New(Environment* env,

Local<Promise> promise,

PromiseWrap* parent_wrap,

bool silent) {

Local<Object> object = env->promise_wrap_template()

->NewInstance(env->context()).ToLocalChecked();

object->SetInternalField(PromiseWrap::kPromiseField, promise);

if (parent_wrap != nullptr) {

object->SetInternalField(PromiseWrap::kParentIdField,

Number::New(env->isolate(),

parent_wrap->get_id()));

}

CHECK_EQ(promise->GetAlignedPointerFromInternalField(0), nullptr);

promise->SetInternalField(0, object);

return new PromiseWrap(env, object, silent);

}

void PromiseWrap::GetPromise(Local<String> property,

const PropertyCallbackInfo<Value>& info) {

info.GetReturnValue().Set(info.Holder()->GetInternalField(kPromiseField));

}

void PromiseWrap::GetParentId(Local<String> property,

const PropertyCallbackInfo<Value>& info) {

info.GetReturnValue().Set(info.Holder()->GetInternalField(kParentIdField));

}

static void PromiseHook(PromiseHookType type, Local<Promise> promise,

Local<Value> parent, void* arg) {

Environment* env = static_cast<Environment*>(arg);

Local<Value> resource_object_value = promise->GetInternalField(0);

PromiseWrap* wrap = nullptr;

if (resource_object_value->IsObject()) {

Local<Object> resource_object = resource_object_value.As<Object>();

wrap = Unwrap<PromiseWrap>(resource_object);

}

if (type == PromiseHookType::kInit || wrap == nullptr) {

bool silent = type != PromiseHookType::kInit;

PromiseWrap* parent_wrap = nullptr;

// set parent promise's async Id as this promise's triggerAsyncId

if (parent->IsPromise()) {

// parent promise exists, current promise

// is a chained promise, so we set parent promise's id as

// current promise's triggerAsyncId

Local<Promise> parent_promise = parent.As<Promise>();

Local<Value> parent_resource = parent_promise->GetInternalField(0);

if (parent_resource->IsObject()) {

parent_wrap = Unwrap<PromiseWrap>(parent_resource.As<Object>());

}

if (parent_wrap == nullptr) {

parent_wrap = PromiseWrap::New(env, parent_promise, nullptr, true);

}

// get id from parentWrap

double trigger_id = parent_wrap->get_id();

env->set_init_trigger_id(trigger_id);

}

wrap = PromiseWrap::New(env, promise, parent_wrap, silent);

} else if (type == PromiseHookType::kResolve) {

// TODO(matthewloring): need to expose this through the async hooks api.

}

CHECK_NE(wrap, nullptr);

if (type == PromiseHookType::kBefore) {

env->async_hooks()->push_ids(wrap->get_id(), wrap->get_trigger_id());

PreCallbackExecution(wrap, false);

} else if (type == PromiseHookType::kAfter) {

PostCallbackExecution(wrap, false);

if (env->current_async_id() == wrap->get_id()) {

// This condition might not be true if async_hooks was enabled during

// the promise callback execution.

// Popping it off the stack can be skipped in that case, because is is

// known that it would correspond to exactly one call with

// PromiseHookType::kBefore that was not witnessed by the PromiseHook.

env->async_hooks()->pop_ids(wrap->get_id());

}

}

}

static void SetupHooks(const FunctionCallbackInfo<Value>& args) {

Environment* env = Environment::GetCurrent(args);

if (!args[0]->IsObject())

return env->ThrowTypeError("first argument must be an object");

// All of init, before, after, destroy are supplied by async_hooks

// internally, so this should every only be called once. At which time all

// the functions should be set. Detect this by checking if init !IsEmpty().

CHECK(env->async_hooks_init_function().IsEmpty());

Local<Object> fn_obj = args[0].As<Object>();

#define SET_HOOK_FN(name) \

Local<Value> name##_v = fn_obj->Get( \

env->context(), \

FIXED_ONE_BYTE_STRING(env->isolate(), #name)).ToLocalChecked(); \

CHECK(name##_v->IsFunction()); \

env->set_async_hooks_##name##_function(name##_v.As<Function>());

SET_HOOK_FN(init);

SET_HOOK_FN(before);

SET_HOOK_FN(after);

SET_HOOK_FN(destroy);

#undef SET_HOOK_FN

{

Local<FunctionTemplate> ctor =

FunctionTemplate::New(env->isolate());

ctor->SetClassName(FIXED_ONE_BYTE_STRING(env->isolate(), "PromiseWrap"));

Local<ObjectTemplate> promise_wrap_template = ctor->InstanceTemplate();

promise_wrap_template->SetInternalFieldCount(

PromiseWrap::kInternalFieldCount);

promise_wrap_template->SetAccessor(

FIXED_ONE_BYTE_STRING(env->isolate(), "promise"),

PromiseWrap::GetPromise);

promise_wrap_template->SetAccessor(

FIXED_ONE_BYTE_STRING(env->isolate(), "parentId"),

PromiseWrap::GetParentId);

env->set_promise_wrap_template(promise_wrap_template);

}

}

static void EnablePromiseHook(const FunctionCallbackInfo<Value>& args) {

Environment* env = Environment::GetCurrent(args);

env->AddPromiseHook(PromiseHook, static_cast<void*>(env));

}

static void DisablePromiseHook(const FunctionCallbackInfo<Value>& args) {

Environment* env = Environment::GetCurrent(args);

// Delay the call to `RemovePromiseHook` because we might currently be

// between the `before` and `after` calls of a Promise.

env->isolate()->EnqueueMicrotask([](void* data) {

Environment* env = static_cast<Environment*>(data);

env->RemovePromiseHook(PromiseHook, data);

}, static_cast<void*>(env));

}

void AsyncWrap::GetAsyncId(const FunctionCallbackInfo<Value>& args) {

AsyncWrap* wrap;

args.GetReturnValue().Set(-1);

ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());

args.GetReturnValue().Set(wrap->get_id());

}

void AsyncWrap::PushAsyncIds(const FunctionCallbackInfo<Value>& args) {

Environment* env = Environment::GetCurrent(args);

// No need for CHECK(IsNumber()) on args because if FromJust() doesn't fail

// then the checks in push_ids() and pop_ids() will.

double async_id = args[0]->NumberValue(env->context()).FromJust();

double trigger_id = args[1]->NumberValue(env->context()).FromJust();

env->async_hooks()->push_ids(async_id, trigger_id);

}

void AsyncWrap::PopAsyncIds(const FunctionCallbackInfo<Value>& args) {

Environment* env = Environment::GetCurrent(args);

double async_id = args[0]->NumberValue(env->context()).FromJust();

args.GetReturnValue().Set(env->async_hooks()->pop_ids(async_id));

}

void AsyncWrap::ClearIdStack(const FunctionCallbackInfo<Value>& args) {

Environment* env = Environment::GetCurrent(args);

env->async_hooks()->clear_id_stack();

}

void AsyncWrap::AsyncReset(const FunctionCallbackInfo<Value>& args) {

AsyncWrap* wrap;

ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());

wrap->AsyncReset();

}

void AsyncWrap::QueueDestroyId(const FunctionCallbackInfo<Value>& args) {

CHECK(args[0]->IsNumber());

PushBackDestroyId(Environment::GetCurrent(args), args[0]->NumberValue());

}

void AsyncWrap::Initialize(Local<Object> target,

Local<Value> unused,

Local<Context> context) {

Environment* env = Environment::GetCurrent(context);

Isolate* isolate = env->isolate();

HandleScope scope(isolate);

env->SetMethod(target, "setupHooks", SetupHooks);

env->SetMethod(target, "pushAsyncIds", PushAsyncIds);

env->SetMethod(target, "popAsyncIds", PopAsyncIds);

env->SetMethod(target, "clearIdStack", ClearIdStack);

env->SetMethod(target, "addIdToDestroyList", QueueDestroyId);

env->SetMethod(target, "enablePromiseHook", EnablePromiseHook);

env->SetMethod(target, "disablePromiseHook", DisablePromiseHook);

v8::PropertyAttribute ReadOnlyDontDelete =

static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete);

#define FORCE_SET_TARGET_FIELD(obj, str, field) \

(obj)->ForceSet(context, \

FIXED_ONE_BYTE_STRING(isolate, str), \

field, \

ReadOnlyDontDelete).FromJust()

// Attach the uint32_t[] where each slot contains the count of the number of

// callbacks waiting to be called on a particular event. It can then be

// incremented/decremented from JS quickly to communicate to C++ if there are

// any callbacks waiting to be called.

uint32_t* fields_ptr = env->async_hooks()->fields();

int fields_count = env->async_hooks()->fields_count();

Local<ArrayBuffer> fields_ab =

ArrayBuffer::New(isolate, fields_ptr, fields_count * sizeof(*fields_ptr));

FORCE_SET_TARGET_FIELD(target,

"async_hook_fields",

Uint32Array::New(fields_ab, 0, fields_count));

// The following v8::Float64Array has 5 fields. These fields are shared in

// this way to allow JS and C++ to read/write each value as quickly as

// possible. The fields are represented as follows:

//

// kAsyncUid: Maintains the state of the next unique id to be assigned.

//

// kInitTriggerId: Write the id of the resource responsible for a handle's

// creation just before calling the new handle's constructor. After the new

// handle is constructed kInitTriggerId is set back to 0.

double* uid_fields_ptr = env->async_hooks()->uid_fields();

int uid_fields_count = env->async_hooks()->uid_fields_count();

Local<ArrayBuffer> uid_fields_ab = ArrayBuffer::New(

isolate,

uid_fields_ptr,

uid_fields_count * sizeof(*uid_fields_ptr));

FORCE_SET_TARGET_FIELD(target,

"async_uid_fields",

Float64Array::New(uid_fields_ab, 0, uid_fields_count));

Local<Object> constants = Object::New(isolate);

#define SET_HOOKS_CONSTANT(name) \

FORCE_SET_TARGET_FIELD( \

constants, #name, Integer::New(isolate, AsyncHooks::name));

SET_HOOKS_CONSTANT(kInit);

SET_HOOKS_CONSTANT(kBefore);

SET_HOOKS_CONSTANT(kAfter);

SET_HOOKS_CONSTANT(kDestroy);

SET_HOOKS_CONSTANT(kTotals);

SET_HOOKS_CONSTANT(kCurrentAsyncId);

SET_HOOKS_CONSTANT(kCurrentTriggerId);

SET_HOOKS_CONSTANT(kAsyncUidCntr);

SET_HOOKS_CONSTANT(kInitTriggerId);

#undef SET_HOOKS_CONSTANT

FORCE_SET_TARGET_FIELD(target, "constants", constants);

Local<Object> async_providers = Object::New(isolate);

#define V(p) \

FORCE_SET_TARGET_FIELD( \

async_providers, #p, Integer::New(isolate, AsyncWrap::PROVIDER_ ## p));

NODE_ASYNC_PROVIDER_TYPES(V)

#undef V

FORCE_SET_TARGET_FIELD(target, "Providers", async_providers);

// These Symbols are used throughout node so the stored values on each object

// can be accessed easily across files.

FORCE_SET_TARGET_FIELD(

target,

"async_id_symbol",

Symbol::New(isolate, FIXED_ONE_BYTE_STRING(isolate, "asyncId")));

FORCE_SET_TARGET_FIELD(

target,

"trigger_id_symbol",

Symbol::New(isolate, FIXED_ONE_BYTE_STRING(isolate, "triggerId")));

#undef FORCE_SET_TARGET_FIELD

env->set_async_hooks_init_function(Local<Function>());

env->set_async_hooks_before_function(Local<Function>());

env->set_async_hooks_after_function(Local<Function>());

env->set_async_hooks_destroy_function(Local<Function>());

}

void LoadAsyncWrapperInfo(Environment* env) {

HeapProfiler* heap_profiler = env->isolate()->GetHeapProfiler();

#define V(PROVIDER) \

heap_profiler->SetWrapperClassInfoProvider( \

(NODE_ASYNC_ID_OFFSET + AsyncWrap::PROVIDER_ ## PROVIDER), WrapperInfo);

NODE_ASYNC_PROVIDER_TYPES(V)

#undef V

}

AsyncWrap::AsyncWrap(Environment* env,

Local<Object> object,

ProviderType provider,

bool silent)

: BaseObject(env, object),

provider_type_(provider) {

CHECK_NE(provider, PROVIDER_NONE);

CHECK_GE(object->InternalFieldCount(), 1);

// Shift provider value over to prevent id collision.

persistent().SetWrapperClassId(NODE_ASYNC_ID_OFFSET + provider);

// Use AsyncReset() call to execute the init() callbacks.

AsyncReset(silent);

}

AsyncWrap::~AsyncWrap() {

PushBackDestroyId(env(), get_id());

}

// Generalized call for both the constructor and for handles that are pooled

// and reused over their lifetime. This way a new uid can be assigned when

// the resource is pulled out of the pool and put back into use.

void AsyncWrap::AsyncReset(bool silent) {

async_id_ = env()->new_async_id();

trigger_id_ = env()->get_init_trigger_id();

if (silent) return;

EmitAsyncInit(env(), object(),

env()->async_hooks()->provider_string(provider_type()),

async_id_, trigger_id_);

}

void AsyncWrap::EmitAsyncInit(Environment* env,

Local<Object> object,

Local<String> type,

double async_id,

double trigger_id) {

AsyncHooks* async_hooks = env->async_hooks();

// Nothing to execute, so can continue normally.

if (async_hooks->fields()[AsyncHooks::kInit] == 0) {

return;

}

HandleScope scope(env->isolate());

Local<Function> init_fn = env->async_hooks_init_function();

Local<Value> argv[] = {

Number::New(env->isolate(), async_id),

type,

Number::New(env->isolate(), trigger_id),

object,

};

TryCatch try_catch(env->isolate());

MaybeLocal<Value> ret = init_fn->Call(

env->context(), object, arraysize(argv), argv);

if (ret.IsEmpty()) {

ClearFatalExceptionHandlers(env);

FatalException(env->isolate(), try_catch);

}

}

Local<Value> AsyncWrap::MakeCallback(const Local<Function> cb,

int argc,

Local<Value>* argv) {

CHECK(env()->context() == env()->isolate()->GetCurrentContext());

Environment::AsyncCallbackScope callback_scope(env());

Environment::AsyncHooks::ExecScope exec_scope(env(),

get_id(),

get_trigger_id());

if (!PreCallbackExecution(this, true)) {

return Local<Value>();

}

// Finally... Get to running the user's callback.

MaybeLocal<Value> ret = cb->Call(env()->context(), object(), argc, argv);

Local<Value> ret_v;

if (!ret.ToLocal(&ret_v)) {

return Local<Value>();

}

if (!PostCallbackExecution(this, true)) {

return Local<Value>();

}

exec_scope.Dispose();

if (callback_scope.in_makecallback()) {

return ret_v;

}

Environment::TickInfo* tick_info = env()->tick_info();

if (tick_info->length() == 0) {

env()->isolate()->RunMicrotasks();

}

// Make sure the stack unwound properly. If there are nested MakeCallback's

// then it should return early and not reach this code.

CHECK_EQ(env()->current_async_id(), 0);

CHECK_EQ(env()->trigger_id(), 0);

Local<Object> process = env()->process_object();

if (tick_info->length() == 0) {

tick_info->set_index(0);

return ret_v;

}

MaybeLocal<Value> rcheck =

env()->tick_callback_function()->Call(env()->context(),

process,

0,

nullptr);

// Make sure the stack unwound properly.

CHECK_EQ(env()->current_async_id(), 0);

CHECK_EQ(env()->trigger_id(), 0);

return rcheck.IsEmpty() ? Local<Value>() : ret_v;

}

/* Public C++ embedder API */

async_id AsyncHooksGetExecutionAsyncId(Isolate* isolate) {

return Environment::GetCurrent(isolate)->current_async_id();

}

async_id AsyncHooksGetCurrentId(Isolate* isolate) {

return AsyncHooksGetExecutionAsyncId(isolate);

}

async_id AsyncHooksGetTriggerAsyncId(Isolate* isolate) {

return Environment::GetCurrent(isolate)->trigger_id();

}

async_id AsyncHooksGetTriggerId(Isolate* isolate) {

return AsyncHooksGetTriggerAsyncId(isolate);

}

async_context EmitAsyncInit(Isolate* isolate,

Local<Object> resource,

const char* name,

async_id trigger_async_id) {

Environment* env = Environment::GetCurrent(isolate);

// Initialize async context struct

if (trigger_async_id == -1)

trigger_async_id = env->get_init_trigger_id();

async_context context = {

env->new_async_id(), // async_id_

trigger_async_id // trigger_async_id_

};

// Run init hooks

Local<String> type =

String::NewFromUtf8(isolate, name, v8::NewStringType::kInternalized)

.ToLocalChecked();

AsyncWrap::EmitAsyncInit(env, resource, type, context.async_id,

context.trigger_async_id);

return context;

}

void EmitAsyncDestroy(Isolate* isolate, async_context asyncContext) {

PushBackDestroyId(Environment::GetCurrent(isolate), asyncContext.async_id);

}

} // namespace node

NODE_MODULE_CONTEXT_AWARE_BUILTIN(async_wrap, node::AsyncWrap::Initialize)