Move PromiseNextMicrotaskID to cpp

BUG=v8:5343

Review-Url: https://codereview.chromium.org/2425553003
Cr-Commit-Position: refs/heads/master@{#40405}

src/isolate.h

@@ -403,6 +403,7 @@ typedef List<HeapObject*> DebugObjectCache;
   V(base::HashMap*, external_reference_map, nullptr)                          \
   V(base::HashMap*, root_index_map, nullptr)                                  \
   V(int, pending_microtask_count, 0)                                          \
+  V(int, debug_microtask_count, 0)                                            \
   V(HStatistics*, hstatistics, nullptr)                                       \
   V(CompilationStatistics*, turbo_statistics, nullptr)                        \
   V(HTracer*, htracer, nullptr)                                               \
@@ -1104,6 +1105,7 @@ class Isolate {
   void EnqueueMicrotask(Handle<Object> microtask);
   void RunMicrotasks();
   bool IsRunningMicrotasks() const { return is_running_microtasks_; }
+  int GetNextDebugMicrotaskId() { return debug_microtask_count_++; }
 
   void SetUseCounterCallback(v8::Isolate::UseCounterCallback callback);
   void CountUsage(v8::Isolate::UseCounterFeature feature);

src/js/async-await.js

@@ -30,7 +30,6 @@ utils.Import(function(from) {
   NewPromiseCapability = from.NewPromiseCapability;
   PerformPromiseThen = from.PerformPromiseThen;
   PromiseCreate = from.PromiseCreate;
-  PromiseNextMicrotaskID = from.PromiseNextMicrotaskID;
   RejectPromise = from.RejectPromise;
   ResolvePromise = from.ResolvePromise;
 });
@@ -143,7 +142,7 @@ function AsyncFunctionPromiseCreate() {
     %DebugPushPromise(promise);
     // Assign ID and create a recurring task to save stack for future
     // resumptions from await.
-    var id = PromiseNextMicrotaskID();
+    var id = %DebugNextMicrotaskId();
     SET_PRIVATE(promise, promiseAsyncStackIDSymbol, id);
     %DebugAsyncTaskEvent("enqueueRecurring", id, "async function");
   }

src/js/promise.js

@@ -48,12 +48,6 @@ const kPending = 0;
 const kFulfilled = +1;
 const kRejected = -1;
 
-var lastMicrotaskId = 0;
-
-function PromiseNextMicrotaskID() {
-  return ++lastMicrotaskId;
-}
-
 // ES#sec-createresolvingfunctions
 // CreateResolvingFunctions ( promise )
 function CreateResolvingFunctions(promise, debugEvent) {
@@ -202,7 +196,7 @@ function PromiseEnqueue(value, tasks, deferreds, status) {
                        promiseAsyncStackIDSymbol);
       name = "async function";
     } else {
-      id = PromiseNextMicrotaskID();
+      id = %DebugNextMicrotaskId();
       name = status === kFulfilled ? "Promise.resolve" : "Promise.reject";
       %DebugAsyncTaskEvent("enqueue", id, name);
     }
@@ -307,7 +301,7 @@ function ResolvePromise(promise, resolution) {
           // Mark the dependency of the new promise on the resolution
           SET_PRIVATE(resolution, promiseHandledBySymbol, promise);
         }
-        id = PromiseNextMicrotaskID();
+        id = %DebugNextMicrotaskId();
         name = "PromiseResolveThenableJob";
         %DebugAsyncTaskEvent("enqueue", id, name);
       }
@@ -687,7 +681,6 @@ utils.Export(function(to) {
   to.IsPromise = IsPromise;
   to.PromiseCreate = PromiseCreate;
   to.PromiseThen = PromiseThen;
-  to.PromiseNextMicrotaskID = PromiseNextMicrotaskID;
 
   to.GlobalPromise = GlobalPromise;
   to.NewPromiseCapability = NewPromiseCapability;

src/runtime/runtime-debug.cc

@@ -1822,6 +1822,11 @@ RUNTIME_FUNCTION(Runtime_DebugPopPromise) {
   return isolate->heap()->undefined_value();
 }
 
+RUNTIME_FUNCTION(Runtime_DebugNextMicrotaskId) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 0);
+  return Smi::FromInt(isolate->GetNextDebugMicrotaskId());
+}
 
 RUNTIME_FUNCTION(Runtime_DebugAsyncTaskEvent) {
   DCHECK(args.length() == 3);

src/runtime/runtime.h

@@ -194,6 +194,7 @@ namespace internal {
   F(DebugRecordAsyncFunction, 1, 1)             \
   F(DebugPushPromise, 1, 1)                     \
   F(DebugPopPromise, 0, 1)                      \
+  F(DebugNextMicrotaskId, 0, 1)                 \
   F(DebugAsyncTaskEvent, 3, 1)                  \
   F(DebugIsActive, 0, 1)                        \
   F(DebugBreakInOptimizedCode, 0, 1)            \