timers: use V8 fast API calls

Author: joyeecheung

lib/internal/timers.js

@@ -81,14 +81,11 @@ const {
   Symbol,
 } = primordials;
 
+const binding = internalBinding('timers');
 const {
-  scheduleTimer,
-  toggleTimerRef,
-  getLibuvNow,
   immediateInfo,
   timeoutInfo,
-  toggleImmediateRef
-} = internalBinding('timers');
+} = binding;
 
 const {
   getDefaultTriggerAsyncId,
@@ -306,13 +303,17 @@ class ImmediateList {
 const immediateQueue = new ImmediateList();
 
 function incRefCount() {
-  if (timeoutInfo[0]++ === 0)
-    toggleTimerRef(true);
+  if (timeoutInfo[0]++ === 0) {
+    // We need to use the binding as the receiver for fast API calls.
+    binding.toggleTimerRef(true);
+  }
 }
 
 function decRefCount() {
-  if (--timeoutInfo[0] === 0)
-    toggleTimerRef(false);
+  if (--timeoutInfo[0] === 0) {
+    // We need to use the binding as the receiver for fast API calls.
+    binding.toggleTimerRef(false);
+  }
 }
 
 // Schedule or re-schedule a timer.
@@ -356,7 +357,8 @@ function insertGuarded(item, refed, start) {
   item[kRefed] = refed;
 }
 
-function insert(item, msecs, start = getLibuvNow()) {
+// We need to use the binding as the receiver for fast API calls.
+function insert(item, msecs, start = binding.getLibuvNow()) {
   // Truncate so that accuracy of sub-millisecond timers is not assumed.
   msecs = MathTrunc(msecs);
   item._idleStart = start;
@@ -370,7 +372,8 @@ function insert(item, msecs, start = getLibuvNow()) {
     timerListQueue.insert(list);
 
     if (nextExpiry > expiry) {
-      scheduleTimer(msecs);
+      // We need to use the binding as the receiver for fast API calls.
+      binding.scheduleTimer(msecs);
       nextExpiry = expiry;
     }
   }
@@ -559,8 +562,10 @@ function getTimerCallbacks(runNextTicks) {
       emitBefore(asyncId, timer[trigger_async_id_symbol], timer);
 
       let start;
-      if (timer._repeat)
-        start = getLibuvNow();
+      if (timer._repeat) {
+        // We need to use the binding as the receiver for fast API calls.
+        start = binding.getLibuvNow();
+      }
 
       try {
         const args = timer._timerArgs;
@@ -627,17 +632,22 @@ class Immediate {
   ref() {
     if (this[kRefed] === false) {
       this[kRefed] = true;
-      if (immediateInfo[kRefCount]++ === 0)
-        toggleImmediateRef(true);
+
+      if (immediateInfo[kRefCount]++ === 0) {
+        // We need to use the binding as the receiver for fast API calls.
+        binding.toggleImmediateRef(true);
+      }
     }
     return this;
   }
 
   unref() {
     if (this[kRefed] === true) {
       this[kRefed] = false;
-      if (--immediateInfo[kRefCount] === 0)
-        toggleImmediateRef(false);
+      if (--immediateInfo[kRefCount] === 0) {
+        // We need to use the binding as the receiver for fast API calls.
+        binding.toggleImmediateRef(false);
+      }
     }
     return this;
   }

lib/timers.js

@@ -27,10 +27,10 @@ const {
   SymbolToPrimitive
 } = primordials;
 
+const binding = internalBinding('timers');
 const {
   immediateInfo,
-  toggleImmediateRef
-} = internalBinding('timers');
+} = binding;
 const L = require('internal/linkedlist');
 const {
   async_id_symbol,
@@ -323,8 +323,10 @@ function clearImmediate(immediate) {
   immediateInfo[kCount]--;
   immediate._destroyed = true;
 
-  if (immediate[kRefed] && --immediateInfo[kRefCount] === 0)
-    toggleImmediateRef(false);
+  if (immediate[kRefed] && --immediateInfo[kRefCount] === 0) {
+    // We need to use the binding as the receiver for fast API calls.
+    binding.toggleImmediateRef(false);
+  }
   immediate[kRefed] = null;
 
   if (destroyHooksExist() && immediate[async_id_symbol] !== undefined) {

node.gyp

@@ -661,6 +661,7 @@
         'src/string_decoder-inl.h',
         'src/string_search.h',
         'src/tcp_wrap.h',
+        'src/timers.h',
         'src/tracing/agent.h',
         'src/tracing/node_trace_buffer.h',
         'src/tracing/node_trace_writer.h',

src/env.cc

@@ -1273,12 +1273,16 @@ void Environment::ToggleImmediateRef(bool ref) {
   }
 }
 
-
-Local<Value> Environment::GetNow() {
+uint64_t Environment::GetNowUint64() {
   uv_update_time(event_loop());
   uint64_t now = uv_now(event_loop());
   CHECK_GE(now, timer_base());
   now -= timer_base();
+  return now;
+}
+
+Local<Value> Environment::GetNow() {
+  uint64_t now = GetNowUint64();
   if (now <= 0xffffffff)
     return Integer::NewFromUnsigned(isolate(), static_cast<uint32_t>(now));
   else

src/env.h

@@ -908,6 +908,8 @@ class Environment : public MemoryRetainer {
   static inline Environment* ForAsyncHooks(AsyncHooks* hooks);
 
   v8::Local<v8::Value> GetNow();
+  uint64_t GetNowUint64();
+
   void ScheduleTimer(int64_t duration);
   void ToggleTimerRef(bool ref);
 

src/node_external_reference.h

@@ -11,6 +11,12 @@
 namespace node {
 
 using CFunctionCallback = void (*)(v8::Local<v8::Value> receiver);
+using CFunctionCallbackReturnDouble =
+    double (*)(v8::Local<v8::Object> receiver);
+using CFunctionCallbackWithInt64 = void (*)(v8::Local<v8::Object> receiver,
+                                            int64_t);
+using CFunctionCallbackWithBool = void (*)(v8::Local<v8::Object> receiver,
+                                           bool);
 
 // This class manages the external references from the V8 heap
 // to the C++ addresses in Node.js.
@@ -20,6 +26,9 @@ class ExternalReferenceRegistry {
 
 #define ALLOWED_EXTERNAL_REFERENCE_TYPES(V)                                    \
   V(CFunctionCallback)                                                         \
+  V(CFunctionCallbackReturnDouble)                                             \
+  V(CFunctionCallbackWithInt64)                                                \
+  V(CFunctionCallbackWithBool)                                                 \
   V(const v8::CFunctionInfo*)                                                  \
   V(v8::FunctionCallback)                                                      \
   V(v8::AccessorGetterCallback)                                                \

src/node_snapshotable.cc

@@ -20,6 +20,7 @@
 #include "node_util.h"
 #include "node_v8.h"
 #include "node_v8_platform-inl.h"
+#include "timers.h"
 
 #if HAVE_INSPECTOR
 #include "inspector/worker_inspector.h"  // ParentInspectorHandle

src/node_snapshotable.h

@@ -27,6 +27,7 @@ struct PropInfo {
   V(v8_binding_data, v8_utils::BindingData)                                    \
   V(blob_binding_data, BlobBindingData)                                        \
   V(process_binding_data, process::BindingData)                                \
+  V(timers_binding_data, timers::BindingData)                                  \
   V(util_weak_reference, util::WeakReference)
 
 enum class EmbedderObjectType : uint8_t {