[promises] Move PromiseReactionJob to c++

This patch results in a 11% improvement over 5 runs in the
bluebird benchmark.

BUG=v8:5343,v8:5046
TBR=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2406343002
Cr-Commit-Position: refs/heads/master@{#40239}

include/v8.h

@@ -8308,8 +8308,8 @@ class Internals {
   static const int kNodeIsPartiallyDependentShift = 4;
   static const int kNodeIsActiveShift = 4;
 
-  static const int kJSObjectType = 0xb9;
-  static const int kJSApiObjectType = 0xb8;
+  static const int kJSObjectType = 0xba;
+  static const int kJSApiObjectType = 0xb9;
   static const int kFirstNonstringType = 0x80;
   static const int kOddballType = 0x83;
   static const int kForeignType = 0x87;

src/ast/ast-types.cc

@@ -262,6 +262,7 @@ AstType::bitset AstBitsetType::Lub(i::Map* map) {
     case INTERCEPTOR_INFO_TYPE:
     case CALL_HANDLER_INFO_TYPE:
     case PROMISE_CONTAINER_TYPE:
+    case PROMISE_REACTION_JOB_INFO_TYPE:
     case FUNCTION_TEMPLATE_INFO_TYPE:
     case OBJECT_TEMPLATE_INFO_TYPE:
     case SIGNATURE_INFO_TYPE:

src/compiler/types.cc

@@ -265,6 +265,7 @@ Type::bitset BitsetType::Lub(i::Map* map) {
     case ALIASED_ARGUMENTS_ENTRY_TYPE:
     case BOX_TYPE:
     case PROMISE_CONTAINER_TYPE:
+    case PROMISE_REACTION_JOB_INFO_TYPE:
     case DEBUG_INFO_TYPE:
     case BREAK_POINT_INFO_TYPE:
     case CELL_TYPE:

src/contexts.h

@@ -91,6 +91,7 @@ enum ContextLookupFlags {
   V(PROMISE_CATCH_INDEX, JSFunction, promise_catch)                       \
   V(PROMISE_CREATE_INDEX, JSFunction, promise_create)                     \
   V(PROMISE_FUNCTION_INDEX, JSFunction, promise_function)                 \
+  V(PROMISE_HANDLE_INDEX, JSFunction, promise_handle)                     \
   V(PROMISE_HAS_USER_DEFINED_REJECT_HANDLER_INDEX, JSFunction,            \
     promise_has_user_defined_reject_handler)                              \
   V(PROMISE_REJECT_INDEX, JSFunction, promise_reject)                     \

src/factory.cc

@@ -938,6 +938,21 @@ Handle<PromiseContainer> Factory::NewPromiseContainer(
   return result;
 }
 
+Handle<PromiseReactionJobInfo> Factory::NewPromiseReactionJobInfo(
+    Handle<Object> value, Handle<Object> tasks, Handle<Object> deferred,
+    Handle<Object> before_debug_event, Handle<Object> after_debug_event,
+    Handle<Context> context) {
+  Handle<PromiseReactionJobInfo> result = Handle<PromiseReactionJobInfo>::cast(
+      NewStruct(PROMISE_REACTION_JOB_INFO_TYPE));
+  result->set_value(*value);
+  result->set_tasks(*tasks);
+  result->set_deferred(*deferred);
+  result->set_before_debug_event(*before_debug_event);
+  result->set_after_debug_event(*after_debug_event);
+  result->set_context(*context);
+  return result;
+}
+
 Handle<AliasedArgumentsEntry> Factory::NewAliasedArgumentsEntry(
     int aliased_context_slot) {
   Handle<AliasedArgumentsEntry> entry = Handle<AliasedArgumentsEntry>::cast(

src/factory.h

@@ -60,6 +60,12 @@ class Factory final {
   // Create a new boxed value.
   Handle<Box> NewBox(Handle<Object> value);
 
+  // Create a new PromiseReactionJobInfo struct.
+  Handle<PromiseReactionJobInfo> NewPromiseReactionJobInfo(
+      Handle<Object> value, Handle<Object> tasks, Handle<Object> deferred,
+      Handle<Object> before_debug, Handle<Object> after_debug_event,
+      Handle<Context> context);
+
   // Create a new PromiseContainer struct.
   Handle<PromiseContainer> NewPromiseContainer(
       Handle<JSReceiver> thenable, Handle<JSReceiver> then,

src/isolate.cc

@@ -24,6 +24,7 @@
 #include "src/crankshaft/hydrogen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
+#include "src/elements.h"
 #include "src/external-reference-table.h"
 #include "src/frames-inl.h"
 #include "src/ic/access-compiler-data.h"
@@ -3066,15 +3067,80 @@ void Isolate::ReportPromiseReject(Handle<JSObject> promise,
       v8::Utils::StackTraceToLocal(stack_trace)));
 }
 
+namespace {
+class PromiseDebugEventScope {
+ public:
+  PromiseDebugEventScope(Isolate* isolate, Object* before, Object* after)
+      : isolate_(isolate),
+        after_(after, isolate_),
+        is_debug_active_(isolate_->debug()->is_active() &&
+                         before->IsJSObject() && after->IsJSObject()) {
+    if (is_debug_active_) {
+      isolate_->debug()->OnAsyncTaskEvent(
+          handle(JSObject::cast(before), isolate_));
+    }
+  }
+
+  ~PromiseDebugEventScope() {
+    if (is_debug_active_) {
+      isolate_->debug()->OnAsyncTaskEvent(Handle<JSObject>::cast(after_));
+    }
+  }
+
+ private:
+  Isolate* isolate_;
+  Handle<Object> after_;
+  bool is_debug_active_;
+};
+}  // namespace
+
+void Isolate::PromiseReactionJob(Handle<PromiseReactionJobInfo> info,
+                                 MaybeHandle<Object>* result,
+                                 MaybeHandle<Object>* maybe_exception) {
+  PromiseDebugEventScope helper(this, info->before_debug_event(),
+                                info->after_debug_event());
+
+  Handle<Object> value(info->value(), this);
+  Handle<Object> tasks(info->tasks(), this);
+  Handle<JSFunction> promise_handle_fn = promise_handle();
+  Handle<Object> undefined = factory()->undefined_value();
+
+  // If tasks is an array we have multiple onFulfilled/onRejected callbacks
+  // associated with the promise. The deferred object for each callback
+  // is attached to this array as well.
+  // Otherwise, there is a single callback and the deferred object is attached
+  // directly to PromiseReactionJobInfo.
+  if (tasks->IsJSArray()) {
+    Handle<JSArray> array = Handle<JSArray>::cast(tasks);
+    DCHECK(array->length()->IsSmi());
+    int length = Smi::cast(array->length())->value();
+    ElementsAccessor* accessor = array->GetElementsAccessor();
+    DCHECK(length % 2 == 0);
+    for (int i = 0; i < length; i += 2) {
+      DCHECK(accessor->HasElement(array, i));
+      DCHECK(accessor->HasElement(array, i + 1));
+      Handle<Object> argv[] = {value, accessor->Get(array, i),
+                               accessor->Get(array, i + 1)};
+      *result = Execution::TryCall(this, promise_handle_fn, undefined,
+                                   arraysize(argv), argv, maybe_exception);
+      // If execution is terminating, just bail out.
+      if (result->is_null() && maybe_exception->is_null()) {
+        return;
+      }
+    }
+  } else {
+    Handle<Object> deferred(info->deferred(), this);
+    Handle<Object> argv[] = {value, tasks, deferred};
+    *result = Execution::TryCall(this, promise_handle_fn, undefined,
+                                 arraysize(argv), argv, maybe_exception);
+  }
+}
+
 void Isolate::PromiseResolveThenableJob(Handle<PromiseContainer> container,
                                         MaybeHandle<Object>* result,
                                         MaybeHandle<Object>* maybe_exception) {
-  if (debug()->is_active()) {
-    Handle<Object> before_debug_event(container->before_debug_event(), this);
-    if (before_debug_event->IsJSObject()) {
-      debug()->OnAsyncTaskEvent(Handle<JSObject>::cast(before_debug_event));
-    }
-  }
+  PromiseDebugEventScope helper(this, container->before_debug_event(),
+                                container->after_debug_event());
 
   Handle<JSReceiver> thenable(container->thenable(), this);
   Handle<JSFunction> resolve(container->resolve(), this);
@@ -3092,18 +3158,12 @@ void Isolate::PromiseResolveThenableJob(Handle<PromiseContainer> container,
         Execution::TryCall(this, reject, factory()->undefined_value(),
                            arraysize(reason_arg), reason_arg, maybe_exception);
   }
-
-  if (debug()->is_active()) {
-    Handle<Object> after_debug_event(container->after_debug_event(), this);
-    if (after_debug_event->IsJSObject()) {
-      debug()->OnAsyncTaskEvent(Handle<JSObject>::cast(after_debug_event));
-    }
-  }
 }
 
 void Isolate::EnqueueMicrotask(Handle<Object> microtask) {
   DCHECK(microtask->IsJSFunction() || microtask->IsCallHandlerInfo() ||
-         microtask->IsPromiseContainer());
+         microtask->IsPromiseContainer() ||
+         microtask->IsPromiseReactionJobInfo());
   Handle<FixedArray> queue(heap()->microtask_queue(), this);
   int num_tasks = pending_microtask_count();
   DCHECK(num_tasks <= queue->length());
@@ -3155,11 +3215,16 @@ void Isolate::RunMicrotasksInternal() {
         callback(data);
       } else {
         SaveContext save(this);
-        Context* context = microtask->IsJSFunction()
-                               ? Handle<JSFunction>::cast(microtask)->context()
-                               : Handle<PromiseContainer>::cast(microtask)
-                                     ->resolve()
-                                     ->context();
+        Context* context;
+        if (microtask->IsJSFunction()) {
+          context = Handle<JSFunction>::cast(microtask)->context();
+        } else if (microtask->IsPromiseContainer()) {
+          context =
+              Handle<PromiseContainer>::cast(microtask)->resolve()->context();
+        } else {
+          context = Handle<PromiseReactionJobInfo>::cast(microtask)->context();
+        }
+
         set_context(context->native_context());
         handle_scope_implementer_->EnterMicrotaskContext(
             Handle<Context>(context, this));
@@ -3173,9 +3238,12 @@ void Isolate::RunMicrotasksInternal() {
           result = Execution::TryCall(this, microtask_function,
                                       factory()->undefined_value(), 0, NULL,
                                       &maybe_exception);
-        } else {
+        } else if (microtask->IsPromiseContainer()) {
           PromiseResolveThenableJob(Handle<PromiseContainer>::cast(microtask),
                                     &result, &maybe_exception);
+        } else {
+          PromiseReactionJob(Handle<PromiseReactionJobInfo>::cast(microtask),
+                             &result, &maybe_exception);
         }
 
         handle_scope_implementer_->LeaveMicrotaskContext();

src/isolate.h

@@ -1109,6 +1109,9 @@ class Isolate {
   void ReportPromiseReject(Handle<JSObject> promise, Handle<Object> value,
                            v8::PromiseRejectEvent event);
 
+  void PromiseReactionJob(Handle<PromiseReactionJobInfo> info,
+                          MaybeHandle<Object>* result,
+                          MaybeHandle<Object>* maybe_exception);
   void PromiseResolveThenableJob(Handle<PromiseContainer> container,
                                  MaybeHandle<Object>* result,
                                  MaybeHandle<Object>* maybe_exception);

src/js/promise.js

@@ -185,22 +185,8 @@ function PromiseHandle(value, handler, deferred) {
 }
 
 function PromiseEnqueue(value, tasks, deferreds, status) {
-  var id, name, instrumenting = DEBUG_IS_ACTIVE;
-  %EnqueueMicrotask(function() {
-    if (instrumenting) {
-      %DebugAsyncTaskEvent({ type: "willHandle", id: id, name: name });
-    }
-    if (IS_ARRAY(tasks)) {
-      for (var i = 0; i < tasks.length; i += 2) {
-        PromiseHandle(value, tasks[i], tasks[i + 1]);
-      }
-    } else {
-      PromiseHandle(value, tasks, deferreds);
-    }
-    if (instrumenting) {
-      %DebugAsyncTaskEvent({ type: "didHandle", id: id, name: name });
-    }
-  });
+  var id, name, beforeDebug, afterDebug, instrumenting = DEBUG_IS_ACTIVE;
+
   if (instrumenting) {
     // In an async function, reuse the existing stack related to the outer
     // Promise. Otherwise, e.g. in a direct call to then, save a new stack.
@@ -220,7 +206,12 @@ function PromiseEnqueue(value, tasks, deferreds, status) {
       name = status === kFulfilled ? "Promise.resolve" : "Promise.reject";
       %DebugAsyncTaskEvent({ type: "enqueue", id: id, name: name });
     }
+
+    beforeDebug = { type: "willHandle", id: id, name: name };
+    afterDebug = { type: "didHandle", id: id, name: name };
   }
+
+  %EnqueuePromiseReactionJob(value, tasks, deferreds, beforeDebug, afterDebug);
 }
 
 function PromiseAttachCallbacks(promise, deferred, onResolve, onReject) {
@@ -698,7 +689,8 @@ utils.InstallFunctions(GlobalPromise.prototype, DONT_ENUM, [
   "promise_has_user_defined_reject_handler", PromiseHasUserDefinedRejectHandler,
   "promise_reject", DoRejectPromise,
   "promise_resolve", ResolvePromise,
-  "promise_then", PromiseThen
+  "promise_then", PromiseThen,
+  "promise_handle", PromiseHandle
 ]);
 
 // This allows extras to create promises quickly without building extra

src/objects-debug.cc

@@ -922,6 +922,19 @@ void PromiseContainer::PromiseContainerVerify() {
   after_debug_event()->ObjectVerify();
 }
 
+void PromiseReactionJobInfo::PromiseReactionJobInfoVerify() {
+  Isolate* isolate = GetIsolate();
+  CHECK(IsPromiseReactionJobInfo());
+  CHECK(value()->IsObject());
+  CHECK(tasks()->IsJSArray() || tasks()->IsCallable());
+  CHECK(deferred()->IsJSObject() || deferred()->IsUndefined(isolate));
+  CHECK(before_debug_event()->IsJSObject() ||
+        before_debug_event()->IsUndefined(isolate));
+  CHECK(after_debug_event()->IsJSObject() ||
+        after_debug_event()->IsUndefined(isolate));
+  CHECK(context()->IsContext());
+}
+
 void JSModuleNamespace::JSModuleNamespaceVerify() {
   CHECK(IsJSModuleNamespace());
   module()->ObjectVerify();

src/objects-inl.h

@@ -5661,6 +5661,15 @@ ACCESSORS(PromiseContainer, reject, JSFunction, kRejectOffset)
 ACCESSORS(PromiseContainer, before_debug_event, Object, kBeforeDebugEventOffset)
 ACCESSORS(PromiseContainer, after_debug_event, Object, kAfterDebugEventOffset)
 
+ACCESSORS(PromiseReactionJobInfo, value, Object, kValueOffset);
+ACCESSORS(PromiseReactionJobInfo, tasks, Object, kTasksOffset);
+ACCESSORS(PromiseReactionJobInfo, deferred, Object, kDeferredOffset);
+ACCESSORS(PromiseReactionJobInfo, before_debug_event, Object,
+          kBeforeDebugEventOffset);
+ACCESSORS(PromiseReactionJobInfo, after_debug_event, Object,
+          kAfterDebugEventOffset);
+ACCESSORS(PromiseReactionJobInfo, context, Context, kContextOffset);
+
 Map* PrototypeInfo::ObjectCreateMap() {
   return Map::cast(WeakCell::cast(object_create_map())->value());
 }

src/objects-printer.cc

@@ -1161,6 +1161,18 @@ void PromiseContainer::PromiseContainerPrint(std::ostream& os) {  // NOLINT
   os << "\n";
 }
 
+void PromiseReactionJobInfo::PromiseReactionJobInfoPrint(
+    std::ostream& os) {  // NOLINT
+  HeapObject::PrintHeader(os, "PromiseReactionJobInfo");
+  os << "\n - value: " << Brief(value());
+  os << "\n - tasks: " << Brief(tasks());
+  os << "\n - deferred: " << Brief(deferred());
+  os << "\n - before debug event: " << Brief(before_debug_event());
+  os << "\n - after debug event: " << Brief(after_debug_event());
+  os << "\n - reaction context: " << Brief(context());
+  os << "\n";
+}
+
 void Module::ModulePrint(std::ostream& os) {  // NOLINT
   HeapObject::PrintHeader(os, "Module");
   os << "\n - code: " << Brief(code());

src/objects.h

@@ -143,6 +143,8 @@
 //     - Struct
 //       - Box
 //       - AccessorInfo
+//       - PromiseContainer
+//       - PromiseReactionJobInfo
 //       - AccessorPair
 //       - AccessCheckInfo
 //       - InterceptorInfo
@@ -399,6 +401,7 @@ const int kStubMinorKeyBits = kSmiValueSize - kStubMajorKeyBits - 1;
   V(ALIASED_ARGUMENTS_ENTRY_TYPE)                               \
   V(BOX_TYPE)                                                   \
   V(PROMISE_CONTAINER_TYPE)                                     \
+  V(PROMISE_REACTION_JOB_INFO_TYPE)                             \
   V(PROTOTYPE_INFO_TYPE)                                        \
   V(CONTEXT_EXTENSION_TYPE)                                     \
   V(MODULE_TYPE)                                                \
@@ -506,6 +509,8 @@ const int kStubMinorKeyBits = kSmiValueSize - kStubMajorKeyBits - 1;
 #define STRUCT_LIST(V)                                                       \
   V(BOX, Box, box)                                                           \
   V(PROMISE_CONTAINER, PromiseContainer, promise_container)                  \
+  V(PROMISE_REACTION_JOB_INFO, PromiseReactionJobInfo,                       \
+    promise_reaction_job_info)                                               \
   V(ACCESSOR_INFO, AccessorInfo, accessor_info)                              \
   V(ACCESSOR_PAIR, AccessorPair, accessor_pair)                              \
   V(ACCESS_CHECK_INFO, AccessCheckInfo, access_check_info)                   \
@@ -688,6 +693,7 @@ enum InstanceType {
   ALIASED_ARGUMENTS_ENTRY_TYPE,
   BOX_TYPE,
   PROMISE_CONTAINER_TYPE,
+  PROMISE_REACTION_JOB_INFO_TYPE,
   DEBUG_INFO_TYPE,
   BREAK_POINT_INFO_TYPE,
   FIXED_ARRAY_TYPE,
@@ -6675,9 +6681,8 @@ class Struct: public HeapObject {
   DECLARE_CAST(Struct)
 };
 
-// A container struct to hold state required for
-// PromiseResolveThenableJob. {before, after}_debug_event could
-// potentially be undefined if the debugger is turned off.
+// A container struct to hold state required for PromiseResolveThenableJob.
+// TODO(gsathya): Rename this to be less generic.
 class PromiseContainer : public Struct {
  public:
   DECL_ACCESSORS(thenable, JSReceiver)
@@ -6704,6 +6709,33 @@ class PromiseContainer : public Struct {
   DISALLOW_IMPLICIT_CONSTRUCTORS(PromiseContainer);
 };
 
+// Struct to hold state required for PromiseReactionJob.
+class PromiseReactionJobInfo : public Struct {
+ public:
+  DECL_ACCESSORS(value, Object)
+  DECL_ACCESSORS(tasks, Object)
+  DECL_ACCESSORS(deferred, Object)
+  DECL_ACCESSORS(before_debug_event, Object)
+  DECL_ACCESSORS(after_debug_event, Object)
+  DECL_ACCESSORS(context, Context)
+
+  static const int kValueOffset = Struct::kHeaderSize;
+  static const int kTasksOffset = kValueOffset + kPointerSize;
+  static const int kDeferredOffset = kTasksOffset + kPointerSize;
+  static const int kBeforeDebugEventOffset = kDeferredOffset + kPointerSize;
+  static const int kAfterDebugEventOffset =
+      kBeforeDebugEventOffset + kPointerSize;
+  static const int kContextOffset = kAfterDebugEventOffset + kPointerSize;
+  static const int kSize = kContextOffset + kPointerSize;
+
+  DECLARE_CAST(PromiseReactionJobInfo)
+  DECLARE_PRINTER(PromiseReactionJobInfo)
+  DECLARE_VERIFIER(PromiseReactionJobInfo)
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(PromiseReactionJobInfo);
+};
+
 // A simple one-element struct, useful where smis need to be boxed.
 class Box : public Struct {
  public:

src/runtime/runtime-internal.cc

@@ -571,6 +571,22 @@ RUNTIME_FUNCTION(Runtime_GetAndResetRuntimeCallStats) {
   }
 }
 
+RUNTIME_FUNCTION(Runtime_EnqueuePromiseReactionJob) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 5);
+  CONVERT_ARG_HANDLE_CHECKED(Object, value, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, tasks, 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, deferred, 2);
+  CONVERT_ARG_HANDLE_CHECKED(Object, before_debug_event, 3);
+  CONVERT_ARG_HANDLE_CHECKED(Object, after_debug_event, 4);
+  Handle<PromiseReactionJobInfo> info =
+      isolate->factory()->NewPromiseReactionJobInfo(
+          value, tasks, deferred, before_debug_event, after_debug_event,
+          isolate->native_context());
+  isolate->EnqueueMicrotask(info);
+  return isolate->heap()->undefined_value();
+}
+
 RUNTIME_FUNCTION(Runtime_EnqueuePromiseResolveThenableJob) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 6);

src/runtime/runtime.h

@@ -290,6 +290,7 @@ namespace internal {
   F(CheckIsBootstrapping, 0, 1)                     \
   F(CreateListFromArrayLike, 1, 1)                  \
   F(EnqueueMicrotask, 1, 1)                         \
+  F(EnqueuePromiseReactionJob, 5, 1)                \
   F(EnqueuePromiseResolveThenableJob, 6, 1)         \
   F(GetAndResetRuntimeCallStats, -1 /* <= 2 */, 1)  \
   F(ExportExperimentalFromRuntime, 1, 1)            \