[promises] Create runtime-promise.cc

src/runtime/runtime-promise.cc

+// Copyright 2014 the V8 project authors. All rights reserved.

[adamk, 2016/10/26 16:14:44]

plz update copyright

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/runtime/runtime-utils.h"
+
+#include "src/debug/debug.h"
+#include "src/elements.h"
+
+namespace v8 {
+namespace internal {
+
+namespace {
+
+void PromiseRejectEvent(Isolate* isolate, Handle<JSReceiver> promise,
+                        Handle<Object> rejected_promise, Handle<Object> value,
+                        bool debug_event) {
+  if (isolate->debug()->is_active() && debug_event) {
+    isolate->debug()->OnPromiseReject(rejected_promise, value);
+  }
+  Handle<Symbol> key = isolate->factory()->promise_has_handler_symbol();
+  // Do not report if we actually have a handler.
+  if (JSReceiver::GetDataProperty(promise, key)->IsUndefined(isolate)) {
+    isolate->ReportPromiseReject(Handle<JSObject>::cast(promise), value,
+                                 v8::kPromiseRejectWithNoHandler);
+  }
+}
+
+}  // namespace
+
+RUNTIME_FUNCTION(Runtime_PromiseRejectEvent) {
+  DCHECK(args.length() == 3);
+  HandleScope scope(isolate);
+  CONVERT_ARG_HANDLE_CHECKED(JSObject, promise, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, value, 1);
+  CONVERT_BOOLEAN_ARG_CHECKED(debug_event, 2);
+
+  PromiseRejectEvent(isolate, promise, promise, value, debug_event);
+  return isolate->heap()->undefined_value();
+}
+
+RUNTIME_FUNCTION(Runtime_PromiseRejectEventFromStack) {
+  DCHECK(args.length() == 2);
+  HandleScope scope(isolate);
+  CONVERT_ARG_HANDLE_CHECKED(JSObject, promise, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, value, 1);
+
+  Handle<Object> rejected_promise = promise;
+  if (isolate->debug()->is_active()) {
+    // If the Promise.reject call is caught, then this will return
+    // undefined, which will be interpreted by PromiseRejectEvent
+    // as being a caught exception event.
+    rejected_promise = isolate->GetPromiseOnStackOnThrow();
+  }
+  PromiseRejectEvent(isolate, promise, rejected_promise, value, true);
+  return isolate->heap()->undefined_value();
+}
+
+RUNTIME_FUNCTION(Runtime_PromiseRevokeReject) {
+  DCHECK(args.length() == 1);
+  HandleScope scope(isolate);
+  CONVERT_ARG_HANDLE_CHECKED(JSObject, promise, 0);
+  Handle<Symbol> key = isolate->factory()->promise_has_handler_symbol();
+  // At this point, no revocation has been issued before
+  CHECK(JSReceiver::GetDataProperty(promise, key)->IsUndefined(isolate));
+  isolate->ReportPromiseReject(promise, Handle<Object>(),
+                               v8::kPromiseHandlerAddedAfterReject);
+  return isolate->heap()->undefined_value();
+}
+
+namespace {
+void EnqueuePromiseReactionJob(Isolate* isolate, Handle<Object> value,
+                               Handle<Object> tasks, Handle<Object> deferred,
+                               Handle<Object> status) {
+  Handle<Object> debug_id = isolate->factory()->undefined_value();
+  Handle<Object> debug_name = isolate->factory()->undefined_value();
+  if (isolate->debug()->is_active()) {
+    MaybeHandle<Object> maybe_result;
+    Handle<Object> argv[] = {deferred, status};
+    maybe_result = Execution::TryCall(
+        isolate, isolate->promise_debug_get_info(),
+        isolate->factory()->undefined_value(), arraysize(argv), argv);
+    Handle<Object> result;
+    if ((maybe_result).ToHandle(&result)) {
+      CHECK(result->IsJSArray());
+      Handle<JSArray> array = Handle<JSArray>::cast(result);
+      ElementsAccessor* accessor = array->GetElementsAccessor();
+      DCHECK(accessor->HasElement(array, 0));
+      DCHECK(accessor->HasElement(array, 1));
+      debug_id = accessor->Get(array, 0);
+      debug_name = accessor->Get(array, 1);
+    }
+  }
+  Handle<PromiseReactionJobInfo> info =
+      isolate->factory()->NewPromiseReactionJobInfo(value, tasks, deferred,
+                                                    debug_id, debug_name,
+                                                    isolate->native_context());
+  isolate->EnqueueMicrotask(info);
+}
+
+void PromiseFulfill(Isolate* isolate, Handle<JSReceiver> promise,
+                    Handle<Smi> status, Handle<Object> value,
+                    Handle<Symbol> reaction) {
+  Handle<Object> tasks = JSReceiver::GetDataProperty(promise, reaction);
+  if (!tasks->IsUndefined(isolate)) {
+    Handle<Object> deferred = JSReceiver::GetDataProperty(
+        promise, isolate->factory()->promise_deferred_reaction_symbol());
+    EnqueuePromiseReactionJob(isolate, value, tasks, deferred, status);
+  }
+}
+}  // namespace
+
+RUNTIME_FUNCTION(Runtime_PromiseReject) {
+  DCHECK(args.length() == 3);
+  HandleScope scope(isolate);
+  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, promise, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, reason, 1);
+  CONVERT_BOOLEAN_ARG_CHECKED(debug_event, 2);
+
+  PromiseRejectEvent(isolate, promise, promise, reason, debug_event);
+
+  // This value should be kept in sync with kRejected in promise.js
+  const int kRejected = 2;
+
+  Handle<Smi> status = handle(Smi::FromInt(kRejected), isolate);
+  Handle<Symbol> reaction =
+      isolate->factory()->promise_reject_reactions_symbol();
+  PromiseFulfill(isolate, promise, status, reason, reaction);
+  return isolate->heap()->undefined_value();
+}
+
+RUNTIME_FUNCTION(Runtime_PromiseFulfill) {
+  DCHECK(args.length() == 4);
+  HandleScope scope(isolate);
+  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, promise, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Smi, status, 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, value, 2);
+  CONVERT_ARG_HANDLE_CHECKED(Symbol, reaction, 3);
+  PromiseFulfill(isolate, promise, status, value, reaction);
+  return isolate->heap()->undefined_value();
+}
+
+RUNTIME_FUNCTION(Runtime_EnqueuePromiseReactionJob) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 4);
+  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, status, 3);
+  EnqueuePromiseReactionJob(isolate, value, tasks, deferred, status);
+  return isolate->heap()->undefined_value();
+}
+
+RUNTIME_FUNCTION(Runtime_EnqueuePromiseResolveThenableJob) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 4);
+  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, resolution, 0);
+  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, then, 1);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, resolve, 2);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, reject, 3);
+  Handle<Object> debug_id;
+  Handle<Object> debug_name;
+  if (isolate->debug()->is_active()) {
+    debug_id =
+        handle(Smi::FromInt(isolate->GetNextDebugMicrotaskId()), isolate);
+    debug_name = isolate->factory()->PromiseResolveThenableJob_string();
+    isolate->debug()->OnAsyncTaskEvent(isolate->factory()->enqueue_string(),
+                                       debug_id,
+                                       Handle<String>::cast(debug_name));
+  } else {
+    debug_id = isolate->factory()->undefined_value();
+    debug_name = isolate->factory()->undefined_value();
+  }
+  Handle<PromiseResolveThenableJobInfo> info =
+      isolate->factory()->NewPromiseResolveThenableJobInfo(
+          resolution, then, resolve, reject, debug_id, debug_name);
+  isolate->EnqueueMicrotask(info);
+  return isolate->heap()->undefined_value();
+}
+
+RUNTIME_FUNCTION(Runtime_EnqueueMicrotask) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, microtask, 0);
+  isolate->EnqueueMicrotask(microtask);
+  return isolate->heap()->undefined_value();
+}
+
+RUNTIME_FUNCTION(Runtime_RunMicrotasks) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 0);
+  isolate->RunMicrotasks();
+  return isolate->heap()->undefined_value();
+}
+
+}  // namespace internal
+}  // namespace v8