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// Copyright 2021 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 INCLUDE_V8_PROMISE_H_
#define INCLUDE_V8_PROMISE_H_
#include "v8-local-handle.h" // NOLINT(build/include_directory)
#include "v8-object.h" // NOLINT(build/include_directory)
#include "v8config.h" // NOLINT(build/include_directory)
namespace v8 {
class Context;
#ifndef V8_PROMISE_INTERNAL_FIELD_COUNT
// The number of required internal fields can be defined by embedder.
#define V8_PROMISE_INTERNAL_FIELD_COUNT 0
#endif
/**
* An instance of the built-in Promise constructor (ES6 draft).
*/
class V8_EXPORT Promise : public Object {
public:
/**
* State of the promise. Each value corresponds to one of the possible values
* of the [[PromiseState]] field.
*/
enum PromiseState { kPending, kFulfilled, kRejected };
class V8_EXPORT Resolver : public Object {
public:
/**
* Create a new resolver, along with an associated promise in pending state.
*/
static V8_WARN_UNUSED_RESULT MaybeLocal<Resolver> New(
Local<Context> context);
/**
* Extract the associated promise.
*/
Local<Promise> GetPromise();
/**
* Resolve/reject the associated promise with a given value.
* Ignored if the promise is no longer pending.
*/
V8_WARN_UNUSED_RESULT Maybe<bool> Resolve(Local<Context> context,
Local<Value> value);
V8_WARN_UNUSED_RESULT Maybe<bool> Reject(Local<Context> context,
Local<Value> value);
V8_INLINE static Resolver* Cast(Value* value) {
#ifdef V8_ENABLE_CHECKS
CheckCast(value);
#endif
return static_cast<Promise::Resolver*>(value);
}
private:
Resolver();
static void CheckCast(Value* obj);
};
/**
* Register a resolution/rejection handler with a promise.
* The handler is given the respective resolution/rejection value as
* an argument. If the promise is already resolved/rejected, the handler is
* invoked at the end of turn.
*/
V8_WARN_UNUSED_RESULT MaybeLocal<Promise> Catch(Local<Context> context,
Local<Function> handler);
V8_WARN_UNUSED_RESULT MaybeLocal<Promise> Then(Local<Context> context,
Local<Function> handler);
V8_WARN_UNUSED_RESULT MaybeLocal<Promise> Then(Local<Context> context,
Local<Function> on_fulfilled,
Local<Function> on_rejected);
/**
* Returns true if the promise has at least one derived promise, and
* therefore resolve/reject handlers (including default handler).
*/
bool HasHandler() const;
/**
* Returns the content of the [[PromiseResult]] field. The Promise must not
* be pending.
*/
Local<Value> Result();
/**
* Returns the value of the [[PromiseState]] field.
*/
PromiseState State();
/**
* Marks this promise as handled to avoid reporting unhandled rejections.
*/
void MarkAsHandled();
/**
* Marks this promise as silent to prevent pausing the debugger when the
* promise is rejected.
*/
void MarkAsSilent();
V8_INLINE static Promise* Cast(Value* value) {
#ifdef V8_ENABLE_CHECKS
CheckCast(value);
#endif
return static_cast<Promise*>(value);
}
static const int kEmbedderFieldCount = V8_PROMISE_INTERNAL_FIELD_COUNT;
private:
Promise();
static void CheckCast(Value* obj);
};
/**
* PromiseHook with type kInit is called when a new promise is
* created. When a new promise is created as part of the chain in the
* case of Promise.then or in the intermediate promises created by
* Promise.{race, all}/AsyncFunctionAwait, we pass the parent promise
* otherwise we pass undefined.
*
* PromiseHook with type kResolve is called at the beginning of
* resolve or reject function defined by CreateResolvingFunctions.
*
* PromiseHook with type kBefore is called at the beginning of the
* PromiseReactionJob.
*
* PromiseHook with type kAfter is called right at the end of the
* PromiseReactionJob.
*/
enum class PromiseHookType { kInit, kResolve, kBefore, kAfter };
using PromiseHook = void (*)(PromiseHookType type, Local<Promise> promise,
Local<Value> parent);
// --- Promise Reject Callback ---
enum PromiseRejectEvent {
kPromiseRejectWithNoHandler = 0,
kPromiseHandlerAddedAfterReject = 1,
kPromiseRejectAfterResolved = 2,
kPromiseResolveAfterResolved = 3,
};
class PromiseRejectMessage {
public:
PromiseRejectMessage(Local<Promise> promise, PromiseRejectEvent event,
Local<Value> value)
: promise_(promise), event_(event), value_(value) {}
V8_INLINE Local<Promise> GetPromise() const { return promise_; }
V8_INLINE PromiseRejectEvent GetEvent() const { return event_; }
V8_INLINE Local<Value> GetValue() const { return value_; }
private:
Local<Promise> promise_;
PromiseRejectEvent event_;
Local<Value> value_;
};
using PromiseRejectCallback = void (*)(PromiseRejectMessage message);
} // namespace v8
#endif // INCLUDE_V8_PROMISE_H_
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| cppgc | Folder | 0755 |
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| libplatform | Folder | 0755 |
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| openssl | Folder | 0755 |
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| uv | Folder | 0755 |
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| common.gypi | File | 26.59 KB | 0644 |
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| config.gypi | File | 32.08 KB | 0644 |
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| js_native_api.h | File | 31.64 KB | 0644 |
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| node.h | File | 67.99 KB | 0644 |
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| node_buffer.h | File | 3.6 KB | 0644 |
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| node_object_wrap.h | File | 3.78 KB | 0644 |
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| node_version.h | File | 4.14 KB | 0644 |
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| uv.h | File | 71.1 KB | 0644 |
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| v8-array-buffer.h | File | 17.89 KB | 0644 |
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| v8-callbacks.h | File | 16.59 KB | 0644 |
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| v8-container.h | File | 5.82 KB | 0644 |
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| v8-context.h | File | 17.76 KB | 0644 |
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| v8-cppgc.h | File | 7.46 KB | 0644 |
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| v8-date.h | File | 1.19 KB | 0644 |
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| v8-debug.h | File | 5.04 KB | 0644 |
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| v8-embedder-heap.h | File | 2.71 KB | 0644 |
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| v8-embedder-state-scope.h | File | 1.46 KB | 0644 |
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| v8-extension.h | File | 1.83 KB | 0644 |
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| v8-forward.h | File | 1.65 KB | 0644 |
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| v8-handle-base.h | File | 4.3 KB | 0644 |
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| v8-initialization.h | File | 10.23 KB | 0644 |
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| v8-internal.h | File | 57.22 KB | 0644 |
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| v8-isolate.h | File | 63.38 KB | 0644 |
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| v8-json.h | File | 1.32 KB | 0644 |
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| v8-local-handle.h | File | 23.6 KB | 0644 |
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| v8-locker.h | File | 3.86 KB | 0644 |
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| v8-maybe.h | File | 4.47 KB | 0644 |
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| v8-memory-span.h | File | 6.27 KB | 0644 |
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| v8-message.h | File | 7.24 KB | 0644 |
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| v8-microtask-queue.h | File | 4.95 KB | 0644 |
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| v8-microtask.h | File | 861 B | 0644 |
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| v8-object.h | File | 29.55 KB | 0644 |
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| v8-persistent-handle.h | File | 17.81 KB | 0644 |
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| v8-platform.h | File | 47.9 KB | 0644 |
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| v8-primitive-object.h | File | 2.53 KB | 0644 |
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| v8-primitive.h | File | 27.69 KB | 0644 |
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| v8-profiler.h | File | 41.11 KB | 0644 |
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| v8-promise.h | File | 5.17 KB | 0644 |
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| v8-regexp.h | File | 3.1 KB | 0644 |
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| v8-source-location.h | File | 2.54 KB | 0644 |
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| v8-statistics.h | File | 7.45 KB | 0644 |
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| v8-template.h | File | 50.36 KB | 0644 |
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| v8-traced-handle.h | File | 12.4 KB | 0644 |
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| v8-typed-array.h | File | 11.3 KB | 0644 |
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| v8-unwinder.h | File | 4.64 KB | 0644 |
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| v8-value-serializer.h | File | 10.56 KB | 0644 |
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| v8-value.h | File | 16.71 KB | 0644 |
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| v8-version.h | File | 773 B | 0644 |
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| v8-wasm.h | File | 6 KB | 0644 |
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| v8-weak-callback-info.h | File | 2.41 KB | 0644 |
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| v8.h | File | 3.69 KB | 0644 |
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| v8config.h | File | 32.85 KB | 0644 |
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| zconf.h | File | 16.6 KB | 0644 |
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| zlib.h | File | 95.17 KB | 0644 |
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