src: per-environment time origin value

According to https://html.spec.whatwg.org/#environment-settings-object,
the timeOrigin is a per-environment value. Worker's timeOrigin is the time
when the worker is created
(https://html.spec.whatwg.org/multipage/workers.html#set-up-a-worker-environment-settings-object).

src/env.cc

@@ -352,7 +352,8 @@ Environment::Environment(IsolateData* isolate_data,
       stream_base_state_(isolate_,
                          StreamBase::kNumStreamBaseStateFields,
                          MAYBE_FIELD_PTR(env_info, stream_base_state)),
-      environment_start_time_(PERFORMANCE_NOW()),
+      time_origin_(PERFORMANCE_NOW()),
+      time_origin_timestamp_(GetCurrentTimeInMicroseconds()),
       flags_(flags),
       thread_id_(thread_id.id == static_cast<uint64_t>(-1)
                      ? AllocateEnvironmentThreadId().id
@@ -455,7 +456,7 @@ void Environment::InitializeMainContext(Local<Context> context,
   should_abort_on_uncaught_toggle_[0] = 1;
 
   performance_state_->Mark(performance::NODE_PERFORMANCE_MILESTONE_ENVIRONMENT,
-                           environment_start_time_);
+                           time_origin_);
   performance_state_->Mark(performance::NODE_PERFORMANCE_MILESTONE_NODE_START,
                            per_process::node_start_time);
 

src/env.h

@@ -1380,6 +1380,9 @@ class Environment : public MemoryRetainer {
   inline HandleWrapQueue* handle_wrap_queue() { return &handle_wrap_queue_; }
   inline ReqWrapQueue* req_wrap_queue() { return &req_wrap_queue_; }
 
+  inline uint64_t time_origin() { return time_origin_; }
+  inline double time_origin_timestamp() { return time_origin_timestamp_; }
+
   inline bool EmitProcessEnvWarning() {
     bool current_value = emit_env_nonstring_warning_;
     emit_env_nonstring_warning_ = false;
@@ -1568,7 +1571,10 @@ class Environment : public MemoryRetainer {
 
   AliasedInt32Array stream_base_state_;
 
-  uint64_t environment_start_time_;
+  // https://w3c.github.io/hr-time/#dfn-time-origin
+  uint64_t time_origin_;
+  // https://w3c.github.io/hr-time/#dfn-get-time-origin-timestamp
+  double time_origin_timestamp_;
   std::unique_ptr<performance::PerformanceState> performance_state_;
 
   bool has_run_bootstrapping_code_ = false;

src/node_http2.cc

@@ -640,7 +640,7 @@ void Http2Stream::EmitStatistics() {
   std::unique_ptr<Http2StreamPerformanceEntry> entry =
       std::make_unique<Http2StreamPerformanceEntry>(
           "Http2Stream",
-          start - (node::performance::timeOrigin / 1e6),
+          start - (env()->time_origin() / 1e6),
           duration,
           statistics_);
 
@@ -660,7 +660,7 @@ void Http2Session::EmitStatistics() {
   std::unique_ptr<Http2SessionPerformanceEntry> entry =
       std::make_unique<Http2SessionPerformanceEntry>(
           "Http2Session",
-          start - (node::performance::timeOrigin / 1e6),
+          start - (env()->time_origin() / 1e6),
           duration,
           statistics_);
 

src/node_perf.cc

@@ -35,11 +35,9 @@ using v8::Value;
 
 // Microseconds in a millisecond, as a float.
 #define MICROS_PER_MILLIS 1e3
+// Nanoseconds in a millisecond, as a float.
+#define NANOS_PER_MILLIS 1e6
 
-// https://w3c.github.io/hr-time/#dfn-time-origin
-const uint64_t timeOrigin = PERFORMANCE_NOW();
-// https://w3c.github.io/hr-time/#dfn-time-origin-timestamp
-const double timeOriginTimestamp = GetCurrentTimeInMicroseconds();
 uint64_t performance_v8_start;
 
 PerformanceState::PerformanceState(Isolate* isolate,
@@ -160,9 +158,9 @@ void MarkGarbageCollectionEnd(
     return;
 
   double start_time =
-      (state->performance_last_gc_start_mark - timeOrigin) / 1e6;
+      (state->performance_last_gc_start_mark - env->time_origin()) / NANOS_PER_MILLIS;
   double duration =
-      (PERFORMANCE_NOW() / 1e6) - (state->performance_last_gc_start_mark / 1e6);
+      (PERFORMANCE_NOW() / NANOS_PER_MILLIS) - (state->performance_last_gc_start_mark / NANOS_PER_MILLIS);
 
   std::unique_ptr<GCPerformanceEntry> entry =
       std::make_unique<GCPerformanceEntry>(
@@ -257,12 +255,14 @@ void CreateELDHistogram(const FunctionCallbackInfo<Value>& args) {
 }
 
 void GetTimeOrigin(const FunctionCallbackInfo<Value>& args) {
-  args.GetReturnValue().Set(Number::New(args.GetIsolate(), timeOrigin / 1e6));
+  Environment* env = Environment::GetCurrent(args);
+  args.GetReturnValue().Set(Number::New(args.GetIsolate(), env->time_origin() / 1e6));
 }
 
 void GetTimeOriginTimeStamp(const FunctionCallbackInfo<Value>& args) {
+  Environment* env = Environment::GetCurrent(args);
   args.GetReturnValue().Set(
-      Number::New(args.GetIsolate(), timeOriginTimestamp / MICROS_PER_MILLIS));
+      Number::New(args.GetIsolate(), env->time_origin_timestamp() / MICROS_PER_MILLIS));
 }
 
 void Initialize(Local<Object> target,

src/node_perf.h

@@ -21,8 +21,6 @@ class ExternalReferenceRegistry;
 
 namespace performance {
 
-extern const uint64_t timeOrigin;
-
 inline const char* GetPerformanceMilestoneName(
     PerformanceMilestone milestone) {
   switch (milestone) {

src/node_worker.cc

@@ -817,7 +817,7 @@ void Worker::LoopStartTime(const FunctionCallbackInfo<Value>& args) {
       node::performance::NODE_PERFORMANCE_MILESTONE_LOOP_START];
   CHECK_GE(loop_start_time, 0);
   args.GetReturnValue().Set(
-      (loop_start_time - node::performance::timeOrigin) / 1e6);
+      (loop_start_time - w->env_->time_origin()) / 1e6);
 }
 
 namespace {

test/parallel/test-perf-hooks-worker-timeorigin.js

@@ -0,0 +1,20 @@
+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+const { Worker } = require('worker_threads');
+
+const w = new Worker(`
+require('worker_threads').parentPort.postMessage(performance.timeOrigin);
+`, { eval: true })
+
+w.on('message', common.mustCall(timeOrigin => {
+  // Worker is created after this main context, it's
+  // `performance.timeOrigin` must be greater than this
+  // main context's.
+  assert.ok(timeOrigin > performance.timeOrigin);
+}));
+
+w.on('exit', common.mustCall(code => {
+  assert.strictEqual(code, 0);
+}));