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// Copyright 2016 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.
#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<JSPromise> promise,
Handle<Object> rejected_promise, Handle<Object> value,
bool debug_event) {
isolate->RunPromiseHook(PromiseHookType::kResolve, promise,
isolate->factory()->undefined_value());
if (isolate->debug()->is_active() && debug_event) {
isolate->debug()->OnPromiseReject(rejected_promise, value);
}
// Report only if we don't actually have a handler.
if (!promise->has_handler()) {
isolate->ReportPromiseReject(Handle<JSObject>::cast(promise), value,
v8::kPromiseRejectWithNoHandler);
}
}
} // namespace
RUNTIME_FUNCTION(Runtime_PromiseRejectEventFromStack) {
DCHECK_EQ(2, args.length());
HandleScope scope(isolate);
CONVERT_ARG_HANDLE_CHECKED(JSPromise, 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();
isolate->debug()->OnAsyncTaskEvent(
debug::kDebugEnqueuePromiseReject,
isolate->debug()->NextAsyncTaskId(promise));
}
PromiseRejectEvent(isolate, promise, rejected_promise, value, true);
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(Runtime_ReportPromiseReject) {
DCHECK_EQ(2, args.length());
HandleScope scope(isolate);
CONVERT_ARG_HANDLE_CHECKED(JSPromise, promise, 0);
CONVERT_ARG_HANDLE_CHECKED(Object, value, 1);
isolate->ReportPromiseReject(Handle<JSObject>::cast(promise), value,
v8::kPromiseRejectWithNoHandler);
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(Runtime_PromiseRevokeReject) {
DCHECK_EQ(1, args.length());
HandleScope scope(isolate);
CONVERT_ARG_HANDLE_CHECKED(JSPromise, promise, 0);
// At this point, no revocation has been issued before
CHECK(!promise->has_handler());
isolate->ReportPromiseReject(promise, Handle<Object>(),
v8::kPromiseHandlerAddedAfterReject);
return isolate->heap()->undefined_value();
}
namespace {
// 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.
// Promises with multiple reactions with one or more of them being async
// functions will not get a good stack trace, as async functions require
// different stacks from direct Promise use, but we save and restore a
// stack once for all reactions.
//
// If this isn't a case of async function, we return false, otherwise
// we set the correct id and return true.
//
// TODO(littledan): Improve this case.
bool GetDebugIdForAsyncFunction(Isolate* isolate,
Handle<PromiseReactionJobInfo> info,
int* debug_id) {
// deferred_promise can be Undefined, FixedArray or userland promise object.
if (!info->deferred_promise()->IsJSPromise()) {
return false;
}
Handle<JSPromise> deferred_promise(JSPromise::cast(info->deferred_promise()),
isolate);
Handle<Symbol> handled_by_symbol =
isolate->factory()->promise_handled_by_symbol();
Handle<Object> handled_by_promise =
JSObject::GetDataProperty(deferred_promise, handled_by_symbol);
if (!handled_by_promise->IsJSPromise()) {
return false;
}
Handle<JSPromise> handled_by_promise_js =
Handle<JSPromise>::cast(handled_by_promise);
Handle<Symbol> async_stack_id_symbol =
isolate->factory()->promise_async_stack_id_symbol();
Handle<Object> id =
JSObject::GetDataProperty(handled_by_promise_js, async_stack_id_symbol);
// id can be Undefined or Smi.
if (!id->IsSmi()) {
return false;
}
*debug_id = Handle<Smi>::cast(id)->value();
return true;
}
void SetDebugInfo(Isolate* isolate, Handle<JSPromise> promise,
Handle<PromiseReactionJobInfo> info, int status) {
int id = kDebugPromiseNoID;
if (!GetDebugIdForAsyncFunction(isolate, info, &id)) {
id = isolate->debug()->NextAsyncTaskId(promise);
DCHECK(status != v8::Promise::kPending);
}
info->set_debug_id(id);
}
void EnqueuePromiseReactionJob(Isolate* isolate, Handle<JSPromise> promise,
Handle<PromiseReactionJobInfo> info,
int status) {
if (isolate->debug()->is_active()) {
SetDebugInfo(isolate, promise, info, status);
}
isolate->EnqueueMicrotask(info);
}
} // namespace
RUNTIME_FUNCTION(Runtime_EnqueuePromiseReactionJob) {
HandleScope scope(isolate);
DCHECK_EQ(3, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSPromise, promise, 0);
CONVERT_ARG_HANDLE_CHECKED(PromiseReactionJobInfo, info, 1);
CONVERT_SMI_ARG_CHECKED(status, 2);
EnqueuePromiseReactionJob(isolate, promise, info, status);
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(Runtime_EnqueuePromiseResolveThenableJob) {
HandleScope scope(isolate);
DCHECK(args.length() == 1);
CONVERT_ARG_HANDLE_CHECKED(PromiseResolveThenableJobInfo, info, 0);
isolate->EnqueueMicrotask(info);
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(Runtime_EnqueueMicrotask) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSFunction, microtask, 0);
isolate->EnqueueMicrotask(microtask);
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(Runtime_RunMicrotasks) {
HandleScope scope(isolate);
DCHECK_EQ(0, args.length());
isolate->RunMicrotasks();
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(Runtime_PromiseStatus) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSPromise, promise, 0);
return Smi::FromInt(promise->status());
}
RUNTIME_FUNCTION(Runtime_PromiseResult) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSPromise, promise, 0);
return promise->result();
}
RUNTIME_FUNCTION(Runtime_PromiseMarkAsHandled) {
SealHandleScope shs(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_CHECKED(JSPromise, promise, 0);
promise->set_has_handler(true);
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(Runtime_PromiseMarkHandledHint) {
SealHandleScope shs(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_CHECKED(JSPromise, promise, 0);
promise->set_handled_hint(true);
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(Runtime_PromiseHookInit) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSPromise, promise, 0);
CONVERT_ARG_HANDLE_CHECKED(Object, parent, 1);
isolate->RunPromiseHook(PromiseHookType::kInit, promise, parent);
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(Runtime_PromiseHookResolve) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSPromise, promise, 0);
isolate->RunPromiseHook(PromiseHookType::kResolve, promise,
isolate->factory()->undefined_value());
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(Runtime_PromiseHookBefore) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSPromise, promise, 0);
isolate->RunPromiseHook(PromiseHookType::kBefore, promise,
isolate->factory()->undefined_value());
return isolate->heap()->undefined_value();
}
RUNTIME_FUNCTION(Runtime_PromiseHookAfter) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSPromise, promise, 0);
isolate->RunPromiseHook(PromiseHookType::kAfter, promise,
isolate->factory()->undefined_value());
return isolate->heap()->undefined_value();
}
} // namespace internal
} // namespace v8
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