builtins-promise.h

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// Copyright 2018 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.
 
#ifndef V8_BUILTINS_BUILTINS_PROMISE_H_
#define V8_BUILTINS_BUILTINS_PROMISE_H_
 
#include "src/objects/contexts.h"
 
namespace v8 {
namespace internal {
 
class PromiseBuiltins {
 public:
  enum PromiseResolvingFunctionContextSlot {
    // The promise which resolve/reject callbacks fulfill.
    kPromiseSlot = Context::MIN_CONTEXT_SLOTS,
 
    // Whether the callback was already invoked.
    kAlreadyResolvedSlot,
 
    // Whether to trigger a debug event or not. Used in catch
    // prediction.
    kDebugEventSlot,
    kPromiseContextLength,
  };
 
  // TODO(bmeurer): Move this to a proper context map in contexts.h?
  // Similar to the AwaitContext that we introduced for await closures.
  enum PromiseAllResolveElementContextSlots {
    // Remaining elements count
    kPromiseAllResolveElementRemainingSlot = Context::MIN_CONTEXT_SLOTS,
 
    // Promise capability from Promise.all
    kPromiseAllResolveElementCapabilitySlot,
 
    // Values array from Promise.all
    kPromiseAllResolveElementValuesSlot,
 
    kPromiseAllResolveElementLength
  };
 
  enum PromiseAnyRejectElementContextSlots {
    // Remaining elements count
    kPromiseAnyRejectElementRemainingSlot = Context::MIN_CONTEXT_SLOTS,
 
    // Promise capability from Promise.any
    kPromiseAnyRejectElementCapabilitySlot,
 
    // errors array from Promise.any
    kPromiseAnyRejectElementErrorsSlot,
    kPromiseAnyRejectElementLength
  };
 
  enum FunctionContextSlot {
    kCapabilitySlot = Context::MIN_CONTEXT_SLOTS,
 
    kCapabilitiesContextLength,
  };
 
  // This is used by the Promise.prototype.finally builtin to store
  // onFinally callback and the Promise constructor.
  // TODO(gsathya): For native promises we can create a variant of
  // this without extra space for the constructor to save memory.
  enum PromiseFinallyContextSlot {
    kOnFinallySlot = Context::MIN_CONTEXT_SLOTS,
    kConstructorSlot,
 
    kPromiseFinallyContextLength,
  };
 
  // This is used by the ThenFinally and CatchFinally builtins to
  // store the value to return or reason to throw.
  enum PromiseValueThunkOrReasonContextSlot {
    kValueSlot = Context::MIN_CONTEXT_SLOTS,
 
    kPromiseValueThunkOrReasonContextLength,
  };
 
 private:
  DISALLOW_IMPLICIT_CONSTRUCTORS(PromiseBuiltins);
};
 
}  // namespace internal
}  // namespace v8
 
#endif  // V8_BUILTINS_BUILTINS_PROMISE_H_