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perf_hooks: refactor internals
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Refactor and simplify the perf_hooks native internals.

PR-URL: #17822
Reviewed-By: Anna Henningsen <anna@addaleax.net>
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@jasnell @MylesBorins
jasnell authored and MylesBorins committed Jan 9, 2018
1 parent f82439b commit a329cf6
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Showing 2 changed files with 150 additions and 243 deletions.
259 changes: 110 additions & 149 deletions src/node_perf.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -17,9 +17,8 @@ using v8::Integer;
using v8::Isolate;
using v8::Local;
using v8::Name;
using v8::Number;
using v8::Object;
using v8::ObjectTemplate;
using v8::Signature;
using v8::String;
using v8::Value;

Expand All @@ -30,63 +29,106 @@ uint64_t performance_v8_start;
uint64_t performance_last_gc_start_mark_ = 0;
v8::GCType performance_last_gc_type_ = v8::GCType::kGCTypeAll;

// Initialize the performance entry object properties
inline void InitObject(const PerformanceEntry& entry, Local<Object> obj) {
Environment* env = entry.env();
Isolate* isolate = env->isolate();
Local<Context> context = env->context();
v8::PropertyAttribute attr =
static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete);
obj->DefineOwnProperty(context,
env->name_string(),
String::NewFromUtf8(isolate,
entry.name().c_str(),
String::kNormalString),
attr).FromJust();
obj->DefineOwnProperty(context,
FIXED_ONE_BYTE_STRING(isolate, "entryType"),
String::NewFromUtf8(isolate,
entry.type().c_str(),
String::kNormalString),
attr).FromJust();
obj->DefineOwnProperty(context,
FIXED_ONE_BYTE_STRING(isolate, "startTime"),
Number::New(isolate, entry.startTime()),
attr).FromJust();
obj->DefineOwnProperty(context,
FIXED_ONE_BYTE_STRING(isolate, "duration"),
Number::New(isolate, entry.duration()),
attr).FromJust();
}

// Create a new PerformanceEntry object
const Local<Object> PerformanceEntry::ToObject() const {
Local<Object> obj =
env_->performance_entry_template()
->NewInstance(env_->context()).ToLocalChecked();
InitObject(*this, obj);
return obj;
}

// Allow creating a PerformanceEntry object from JavaScript
void PerformanceEntry::New(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Isolate* isolate = env->isolate();
Utf8Value name(isolate, args[0]);
Utf8Value type(isolate, args[1]);
uint64_t now = PERFORMANCE_NOW();
new PerformanceEntry(env, args.This(), *name, *type, now, now);
PerformanceEntry entry(env, *name, *type, now, now);
Local<Object> obj = args.This();
InitObject(entry, obj);
PerformanceEntry::Notify(env, entry.kind(), obj);
}

void PerformanceEntry::NotifyObservers(Environment* env,
PerformanceEntry* entry) {
// Pass the PerformanceEntry object to the PerformanceObservers
inline void PerformanceEntry::Notify(Environment* env,
PerformanceEntryType type,
Local<Value> object) {
Context::Scope scope(env->context());
uint32_t* observers = env->performance_state()->observers;
PerformanceEntryType type = ToPerformanceEntryTypeEnum(entry->type().c_str());
if (observers == nullptr ||
type == NODE_PERFORMANCE_ENTRY_TYPE_INVALID ||
!observers[type]) {
return;
if (observers != nullptr &&
type != NODE_PERFORMANCE_ENTRY_TYPE_INVALID &&
observers[type]) {
node::MakeCallback(env->isolate(),
env->process_object(),
env->performance_entry_callback(),
1, &object);
}
Local<Context> context = env->context();
Isolate* isolate = env->isolate();
Local<Value> argv = entry->object();
env->performance_entry_callback()->Call(context,
v8::Undefined(isolate),
1, &argv).ToLocalChecked();
}

// Create a User Timing Mark
void Mark(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Local<Context> context = env->context();
Isolate* isolate = env->isolate();
Utf8Value name(isolate, args[0]);
HandleScope scope(env->isolate());
Utf8Value name(env->isolate(), args[0]);
uint64_t now = PERFORMANCE_NOW();
auto marks = env->performance_marks();
(*marks)[*name] = now;

// TODO(jasnell): Once Tracing API is fully implemented, this should
// record a trace event also.

Local<Function> fn = env->performance_entry_template();
Local<Object> obj = fn->NewInstance(context).ToLocalChecked();
new PerformanceEntry(env, obj, *name, "mark", now, now);
PerformanceEntry entry(env, *name, "mark", now, now);
Local<Object> obj = entry.ToObject();
PerformanceEntry::Notify(env, entry.kind(), obj);
args.GetReturnValue().Set(obj);
}


inline uint64_t GetPerformanceMark(Environment* env, std::string name) {
auto marks = env->performance_marks();
auto res = marks->find(name);
return res != marks->end() ? res->second : 0;
}

// Create a User Timing Measure. A Measure is a PerformanceEntry that
// measures the duration between two distinct user timing marks
void Measure(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Local<Context> context = env->context();
Isolate* isolate = env->isolate();
Utf8Value name(isolate, args[0]);
Utf8Value startMark(isolate, args[1]);
Utf8Value endMark(isolate, args[2]);
HandleScope scope(env->isolate());
Utf8Value name(env->isolate(), args[0]);
Utf8Value startMark(env->isolate(), args[1]);
Utf8Value endMark(env->isolate(), args[2]);

double* milestones = env->performance_state()->milestones;

Expand All @@ -113,41 +155,13 @@ void Measure(const FunctionCallbackInfo<Value>& args) {
// TODO(jasnell): Once Tracing API is fully implemented, this should
// record a trace event also.

Local<Function> fn = env->performance_entry_template();
Local<Object> obj = fn->NewInstance(context).ToLocalChecked();
new PerformanceEntry(env, obj, *name, "measure",
startTimestamp, endTimestamp);
PerformanceEntry entry(env, *name, "measure", startTimestamp, endTimestamp);
Local<Object> obj = entry.ToObject();
PerformanceEntry::Notify(env, entry.kind(), obj);
args.GetReturnValue().Set(obj);
}

void GetPerformanceEntryName(const FunctionCallbackInfo<Value>& info) {
Isolate* isolate = info.GetIsolate();
PerformanceEntry* entry;
ASSIGN_OR_RETURN_UNWRAP(&entry, info.Holder());
info.GetReturnValue().Set(
String::NewFromUtf8(isolate, entry->name().c_str(), String::kNormalString));
}

void GetPerformanceEntryType(const FunctionCallbackInfo<Value>& info) {
Isolate* isolate = info.GetIsolate();
PerformanceEntry* entry;
ASSIGN_OR_RETURN_UNWRAP(&entry, info.Holder());
info.GetReturnValue().Set(
String::NewFromUtf8(isolate, entry->type().c_str(), String::kNormalString));
}

void GetPerformanceEntryStartTime(const FunctionCallbackInfo<Value>& info) {
PerformanceEntry* entry;
ASSIGN_OR_RETURN_UNWRAP(&entry, info.Holder());
info.GetReturnValue().Set(entry->startTime());
}

void GetPerformanceEntryDuration(const FunctionCallbackInfo<Value>& info) {
PerformanceEntry* entry;
ASSIGN_OR_RETURN_UNWRAP(&entry, info.Holder());
info.GetReturnValue().Set(entry->duration());
}

// Allows specific Node.js lifecycle milestones to be set from JavaScript
void MarkMilestone(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Local<Context> context = env->context();
Expand All @@ -160,73 +174,63 @@ void MarkMilestone(const FunctionCallbackInfo<Value>& args) {
}
}


void SetupPerformanceObservers(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
CHECK(args[0]->IsFunction());
env->set_performance_entry_callback(args[0].As<Function>());
}

void PerformanceGCCallback(uv_async_t* handle) {
PerformanceEntry::Data* data =
static_cast<PerformanceEntry::Data*>(handle->data);
Environment* env = data->env();
Isolate* isolate = env->isolate();
HandleScope scope(isolate);
// Creates a GC Performance Entry and passes it to observers
void PerformanceGCCallback(Environment* env, void* ptr) {
GCPerformanceEntry* entry = static_cast<GCPerformanceEntry*>(ptr);
HandleScope scope(env->isolate());
Local<Context> context = env->context();
Context::Scope context_scope(context);
Local<Function> fn;
Local<Object> obj;
PerformanceGCKind kind = static_cast<PerformanceGCKind>(data->data());

uint32_t* observers = env->performance_state()->observers;
if (!observers[NODE_PERFORMANCE_ENTRY_TYPE_GC]) {
goto cleanup;
if (observers[NODE_PERFORMANCE_ENTRY_TYPE_GC]) {
Local<Object> obj = entry->ToObject();
v8::PropertyAttribute attr =
static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete);
obj->DefineOwnProperty(context,
FIXED_ONE_BYTE_STRING(env->isolate(), "kind"),
Integer::New(env->isolate(), entry->gckind()),
attr).FromJust();
PerformanceEntry::Notify(env, entry->kind(), obj);
}

fn = env->performance_entry_template();
obj = fn->NewInstance(context).ToLocalChecked();
obj->Set(context,
FIXED_ONE_BYTE_STRING(isolate, "kind"),
Integer::New(isolate, kind)).FromJust();
new PerformanceEntry(env, obj, data);

cleanup:
delete data;
auto closeCB = [](uv_handle_t* handle) {
delete reinterpret_cast<uv_async_t*>(handle);
};
uv_close(reinterpret_cast<uv_handle_t*>(handle), closeCB);
delete entry;
}

// Marks the start of a GC cycle
void MarkGarbageCollectionStart(Isolate* isolate,
v8::GCType type,
v8::GCCallbackFlags flags) {
performance_last_gc_start_mark_ = PERFORMANCE_NOW();
performance_last_gc_type_ = type;
}

// Marks the end of a GC cycle
void MarkGarbageCollectionEnd(Isolate* isolate,
v8::GCType type,
v8::GCCallbackFlags flags,
void* data) {
Environment* env = static_cast<Environment*>(data);
uv_async_t* async = new uv_async_t(); // coverity[leaked_storage]
if (uv_async_init(env->event_loop(), async, PerformanceGCCallback))
return delete async;
uv_unref(reinterpret_cast<uv_handle_t*>(async));
async->data =
new PerformanceEntry::Data(env, "gc", "gc",
performance_last_gc_start_mark_,
PERFORMANCE_NOW(), type);
CHECK_EQ(0, uv_async_send(async));
env->SetImmediate(PerformanceGCCallback,
new GCPerformanceEntry(env,
static_cast<PerformanceGCKind>(type),
performance_last_gc_start_mark_,
PERFORMANCE_NOW()));
}


inline void SetupGarbageCollectionTracking(Environment* env) {
env->isolate()->AddGCPrologueCallback(MarkGarbageCollectionStart);
env->isolate()->AddGCEpilogueCallback(MarkGarbageCollectionEnd,
static_cast<void*>(env));
}

// Gets the name of a function
inline Local<Value> GetName(Local<Function> fn) {
Local<Value> val = fn->GetDebugName();
if (val.IsEmpty() || val->IsUndefined()) {
Expand All @@ -238,6 +242,9 @@ inline Local<Value> GetName(Local<Function> fn) {
return val;
}

// Executes a wrapped Function and captures timing information, causing a
// Function PerformanceEntry to be emitted to PerformanceObservers after
// execution.
void TimerFunctionCall(const FunctionCallbackInfo<Value>& args) {
Isolate* isolate = args.GetIsolate();
HandleScope scope(isolate);
Expand All @@ -247,9 +254,8 @@ void TimerFunctionCall(const FunctionCallbackInfo<Value>& args) {
size_t count = args.Length();
size_t idx;
std::vector<Local<Value>> call_args;
for (size_t i = 0; i < count; ++i) {
for (size_t i = 0; i < count; ++i)
call_args.push_back(args[i]);
}

Utf8Value name(isolate, GetName(fn));

Expand Down Expand Up @@ -286,15 +292,14 @@ void TimerFunctionCall(const FunctionCallbackInfo<Value>& args) {
if (!observers[NODE_PERFORMANCE_ENTRY_TYPE_FUNCTION])
return;

Local<Function> ctor = env->performance_entry_template();
v8::MaybeLocal<Object> instance = ctor->NewInstance(context);
Local<Object> obj = instance.ToLocalChecked();
for (idx = 0; idx < count; idx++) {
obj->Set(context, idx, args[idx]).ToChecked();
}
new PerformanceEntry(env, obj, *name, "function", start, end);
PerformanceEntry entry(env, *name, "function", start, end);
Local<Object> obj = entry.ToObject();
for (idx = 0; idx < count; idx++)
obj->Set(context, idx, args[idx]).FromJust();
PerformanceEntry::Notify(env, entry.kind(), obj);
}

// Wraps a Function in a TimerFunctionCall
void Timerify(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Local<Context> context = env->context();
Expand All @@ -307,6 +312,7 @@ void Timerify(const FunctionCallbackInfo<Value>& args) {
args.GetReturnValue().Set(wrap);
}


void Init(Local<Object> target,
Local<Value> unused,
Local<Context> context) {
Expand All @@ -329,55 +335,10 @@ void Init(Local<Object> target,
Local<String> performanceEntryString =
FIXED_ONE_BYTE_STRING(isolate, "PerformanceEntry");

Local<FunctionTemplate> pe = env->NewFunctionTemplate(PerformanceEntry::New);
pe->InstanceTemplate()->SetInternalFieldCount(1);
Local<FunctionTemplate> pe = FunctionTemplate::New(isolate);
pe->SetClassName(performanceEntryString);

Local<Signature> signature = Signature::New(env->isolate(), pe);

Local<FunctionTemplate> get_performance_entry_name_templ =
FunctionTemplate::New(env->isolate(),
GetPerformanceEntryName,
env->as_external(),
signature);

Local<FunctionTemplate> get_performance_entry_type_templ =
FunctionTemplate::New(env->isolate(),
GetPerformanceEntryType,
env->as_external(),
signature);

Local<FunctionTemplate> get_performance_entry_start_time_templ =
FunctionTemplate::New(env->isolate(),
GetPerformanceEntryStartTime,
env->as_external(),
signature);

Local<FunctionTemplate> get_performance_entry_duration_templ =
FunctionTemplate::New(env->isolate(),
GetPerformanceEntryDuration,
env->as_external(),
signature);

Local<ObjectTemplate> ot = pe->InstanceTemplate();
ot->SetAccessorProperty(env->name_string(),
get_performance_entry_name_templ,
Local<FunctionTemplate>());

ot->SetAccessorProperty(FIXED_ONE_BYTE_STRING(isolate, "entryType"),
get_performance_entry_type_templ,
Local<FunctionTemplate>());

ot->SetAccessorProperty(FIXED_ONE_BYTE_STRING(isolate, "startTime"),
get_performance_entry_start_time_templ,
Local<FunctionTemplate>());

ot->SetAccessorProperty(FIXED_ONE_BYTE_STRING(isolate, "duration"),
get_performance_entry_duration_templ,
Local<FunctionTemplate>());

Local<Function> fn = pe->GetFunction();
target->Set(performanceEntryString, fn);
target->Set(context, performanceEntryString, fn).FromJust();
env->set_performance_entry_template(fn);

env->SetMethod(target, "mark", Mark);
Expand Down
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