On Js side, I just print the stacktrace.
```js
global.QuickApp.unhandledrejection = (type, promise, reason) => {
if (reason.stack) {
console.warn(`Unhandled promise rejection: ${reason.stack}`)
}
}
```
On Sunday, June 14, 2020 at 9:26:28 PM UTC+8 Jiawen Geng wrote:
> full debug stacktrace
>
> ```console
> 2020-06-14 21:14:13.495 28667-28667/? A/DEBUG: #00 pc
> 000000000029e4e8
> /data/app/org.hapjs.mockup-p8e0E5lxR7_KO_oGkm6tOw==/lib/arm64/libjsenv.so
> 2020-06-14 21:14:13.495 28667-28667/? A/DEBUG: #01 pc
> 0000000000297040
> /data/app/org.hapjs.mockup-p8e0E5lxR7_KO_oGkm6tOw==/lib/arm64/libjsenv.so
> 2020-06-14 21:14:13.495 28667-28667/? A/DEBUG: #02 pc
> 0000000000296aec
> /data/app/org.hapjs.mockup-p8e0E5lxR7_KO_oGkm6tOw==/lib/arm64/libjsenv.so
> 2020-06-14 21:14:13.495 28667-28667/? A/DEBUG: #03 pc
> 0000000000463c40
> /data/app/org.hapjs.mockup-p8e0E5lxR7_KO_oGkm6tOw==/lib/arm64/libjsenv.so
> (v8::internal::Debug::StopSideEffectCheckMode()+824)
> 2020-06-14 21:14:13.495 28667-28667/? A/DEBUG: #04 pc
> 0000000000445f78
> /data/app/org.hapjs.mockup-p8e0E5lxR7_KO_oGkm6tOw==/lib/arm64/libjsenv.so
> 2020-06-14 21:14:13.495 28667-28667/? A/DEBUG: #05 pc
> 000000000031bb38
> /data/app/org.hapjs.mockup-p8e0E5lxR7_KO_oGkm6tOw==/lib/arm64/libjsenv.so
> (v8::debug::EvaluateGlobal(v8::Isolate*, v8::Local<v8::String>,
> v8::debug::EvaluateGlobalMode, bool)+260)
> 2020-06-14 21:14:13.495 28667-28667/? A/DEBUG: #06 pc
> 0000000000d4ddc8
> /data/app/org.hapjs.mockup-p8e0E5lxR7_KO_oGkm6tOw==/lib/arm64/libjsenv.so
> 2020-06-14 21:14:13.495 28667-28667/? A/DEBUG: #07 pc
> 0000000000d03490
> /data/app/org.hapjs.mockup-p8e0E5lxR7_KO_oGkm6tOw==/lib/arm64/libjsenv.so
> 2020-06-14 21:14:13.495 28667-28667/? A/DEBUG: #08 pc
> 0000000000d0803c
> /data/app/org.hapjs.mockup-p8e0E5lxR7_KO_oGkm6tOw==/lib/arm64/libjsenv.so
> 2020-06-14 21:14:13.495 28667-28667/? A/DEBUG: #09 pc
> 0000000000d69640
> /data/app/org.hapjs.mockup-p8e0E5lxR7_KO_oGkm6tOw==/lib/arm64/libjsenv.so
> 2020-06-14 21:14:13.495 28667-28667/? A/DEBUG: #10 pc
> 0000000000d47ce8
> /data/app/org.hapjs.mockup-p8e0E5lxR7_KO_oGkm6tOw==/lib/arm64/libjsenv.so
> 2020-06-14 21:14:13.495 28667-28667/? A/DEBUG: #11 pc
> 000000000026d79c
> /data/app/org.hapjs.mockup-p8e0E5lxR7_KO_oGkm6tOw==/lib/arm64/libjsenv.so
> 2020-06-14 21:14:13.495 28667-28667/? A/DEBUG: #12 pc
> 0000000000003d30
> /data/app/org.hapjs.mockup-p8e0E5lxR7_KO_oGkm6tOw==/lib/arm64/libinspector.so
> (inspector::HybridInspector::nativeHandleMessage(_JNIEnv*, _jobject*, long,
> int, _jstring*)+224)
> 2020-06-14 21:14:13.495 28667-28667/? A/DEBUG: #13 pc
> 0000000000053b58
> /data/app/org.hapjs.mockup-p8e0E5lxR7_KO_oGkm6tOw==/oat/arm64/base.odex
> (offset 0x33000)
> ```
>
> On Sunday, June 14, 2020 at 9:23:55 PM UTC+8 techni...@gmail.com wrote:
>
>> This is debug build, on release build, I am getting null pointer
>> reference on `(void)f->Call(context, Undefined(isolate), 3, args);` this
>> line, but f is not nullpointer as I debug.
>>
>> On Sunday, June 14, 2020 at 9:20:36 PM UTC+8 techni...@gmail.com wrote:
>>
>>> I am implementing a PromiseRejection hook for android. But when I
>>> upgrade to v8 8.3. It crashes.
>>>
>>> logcat
>>>
>>> ```console
>>> 2020-06-14 21:14:12.690 28467-28517/org.hapjs.mockup E/v8: #
>>> # Fatal error in ../../src/debug/debug.cc, line 2204
>>> #
>>> 2020-06-14 21:14:12.690 28467-28517/org.hapjs.mockup E/v8: Debug check
>>> failed: isolate_->has_pending_exception().
>>> ```
>>>
>>> ```cpp
>>> void handle(PromiseRejectMessage message) {
>>> auto promise = message.GetPromise();
>>> auto event = message.GetEvent();
>>> auto value = message.GetValue();
>>>
>>> Isolate* isolate = promise->GetIsolate();
>>> Local<Context> context = isolate->GetCurrentContext();
>>> Local<String> quickApp =
>>> String::NewFromUtf8(isolate, "QuickApp", NewStringType::kNormal)
>>> .ToLocalChecked();
>>> Local<String> p =
>>> String::NewFromUtf8(isolate, "unhandledrejection",
>>> NewStringType::kNormal)
>>> .ToLocalChecked();
>>> v8::Local<v8::Object> global =
>>> context->Global()->GetPrototype().As<v8::Object>();
>>>
>>> v8::Local<v8::Value> quickAppGlobalMaybe;
>>> (void)global->Get(context, quickApp).ToLocal(&quickAppGlobalMaybe);
>>> if (quickAppGlobalMaybe.IsEmpty() || !quickAppGlobalMaybe->IsObject()) {
>>> return;
>>> }
>>>
>>> Local<v8::Object> quickAppGlobal = quickAppGlobalMaybe.As<Object>();
>>>
>>> v8::Local<v8::Value> rejectFunc;
>>> (void)quickAppGlobal->Get(context, p).ToLocal(&rejectFunc);
>>>
>>> if (rejectFunc->IsFunction()) {
>>> Local<Function> f = rejectFunc.As<Function>();
>>> Local<Value> type = Number::New(isolate, event);
>>> Local<Value> args[] = {type, promise, value};
>>>
>>> // See https://github.com/nodejs/node/pull/29513
>>> if(value.IsEmpty()){
>>> value = v8::Undefined(isolate);
>>> }
>>> v8::TryCatch try_catch(isolate);
>>> (void)f->Call(context, Undefined(isolate), 3, args);
>>> if (try_catch.HasCaught() && !try_catch.HasTerminated()) {
>>> fprintf(stderr, "Exception in PromiseRejectCallback:\n");
>>> }
>>> }
>>> }
>>> ```
>>>
>>> Anyone can help me on this one, thanks.
>>>
>>>
--
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