This is a bug in our API implementation. Or better, there is a mismatch
between API and what we do internally. "Method names" and "class names" are
stored separately from function names. This can be seen here, when we
collect all the information for a single frame:
https://cs.chromium.org/chromium/src/v8/src/heap/factory.cc?rcl=e1eb815647f334a8cf970439343a8febfa9f6d11&l=3732
There is really no reason why this information shouldn't be made available
in the API. The only tricky thing is to come up with a better API, as some
of the getters change meaning depending whether its a JS or WASM frame and
I am not really happy with the current solution.
On Mon, Nov 18, 2019 at 4:40 PM Darin Dimitrov <darin.dimit...@gmail.com>
wrote:
> I am embedding V8 and trying to capture the current javascript stacktrace
> using the "v8::StackTrace::CurrentStackTrace":
>
> Isolate* isolate = info.GetIsolate();
>
> Local<StackTrace> stack = v8::StackTrace::CurrentStackTrace(isolate, 10,
> v8::StackTrace::StackTraceOptions::kDetailed);
>
> *for* (*int* i = 0; i < stack->GetFrameCount(); i++) {
>
> Local<v8::StackFrame> frame = stack->GetFrame(isolate, i);
>
> Local<v8::String> funcName = frame->GetFunctionName();
>
> v8::String::Utf8Value str(isolate, funcName);
>
> *const* *char** name = *str;
>
> printf("%s (%d:%d)\n", name, frame->GetLineNumber(), frame->GetColumn
> ());
>
> }
>
> I have placed this code inside a custom function that I have registered to
> the global scope.
>
> Before calling my custom function, I tried logging the stack property of
> an Error object (by using : console.log(new Error().stack)) and I obtained
> the following output:
>
> Error
> at bar (file:///app/bundle.js:266:29)
> at test (file:///app/bundle.js:267:15)
> at Observable.onTap (file:///app/bundle.js:268:11)
> at Button.notify (file:///app/vendor.js:3620:32)
> at Button._emit (file:///app/vendor.js:3640:18)
> at TapHandlerImpl.tap (file:///app/vendor.js:15540:19)
>
> With the "v8::StackTrace::CurrentStackTrace" method I get:
>
> bar (266:29)
> test (267:15)
> (null) (268:11)
> (null) (3620:32)
> (null) (3640:18)
> (null) (15540:19)
>
> I am getting empty function names from some frames, while all the other
> information is present (script name, line, column numbers, ...).
>
> Do you know what might be the reason for getting empty function names?
>
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