src/objects/js-promise.tq

// Copyright 2019 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// JSPromise constants
const kJSPromiseStatusMask: constexpr int31
    generates 'JSPromise::kStatusMask';
const kJSPromiseStatusShift: constexpr int31
    generates 'JSPromise::kStatusShift';
const kJSPromiseHasHandlerMask: constexpr int31
    generates 'JSPromise::kHasHandlerMask';

@generateCppClass
extern class JSPromise extends JSObject {
  Status(): PromiseState {
    StaticAssert(kJSPromiseStatusShift == 0);
    const status: int32 = Convert<int32>(this.flags) & kJSPromiseStatusMask;
    return Convert<PromiseState>(status);
  }

  SetStatus(status: constexpr PromiseState): void {
    assert(this.Status() == kPromisePending);
    assert(status != kPromisePending);

    const mask: Smi = SmiConstant(status);
    this.flags = this.flags | mask;
  }

  HasHandler(): bool {
    return (this.flags & kJSPromiseHasHandlerMask) != 0;
  }

  SetHasHandler(): void {
    this.flags |= kJSPromiseHasHandlerMask;
  }

  // Smi 0 terminated list of PromiseReaction objects in case the JSPromise was
  // not settled yet, otherwise the result.
  reactions_or_result: Zero|PromiseReaction|JSAny;
  flags: Smi;
}