assertion failure, bind() issue

[espruino-discuss]

Posted at 2016-08-15 by tve

I'm continuing to have issues that I believe are related to using bind(). The call of the function returned crashes. I don't know how to repro it in a simple situation yet. I do have a stack back-trace. The assertion is in jsvRef:

ASSERT(var && jsvHasRef(var)) FAILED AT src/jsvar.c:622

The lower part of the stack is (top-down):

jspePostfixExpression at /big/home/src/esp8266/Espruino/src/jsparse.c:1424
jspeFactorFunctionCall at /big/home/src/esp8266/Espruino/src/jsparse.c:1157
jspeFunctionCall at /big/home/src/esp8266/Espruino/src/jsparse.c:618
jsvCopy at /big/home/src/esp8266/Espruino/src/jsvar.c:2051
jsvRef at /big/home/src/esp8266/Espruino/src/jsvar.c:622

Any clue? How can I troubleshoot this? Any way I can find out which JS statement caused this?

[gfwilliams]

Posted at 2016-08-15 by @gfwilliams

There's a GDB macro called whereami in .gdbinit that should tell you what the call was.

Looks to me like that's an issue when running jsvCopy on a 'bound' function parameter. Could be it's an argument type that jsvCopy doesn't usually get run with.

If you can find out what the parameter was ( p jsvTrace(value,0) in jspeFunctionCall's scope) it should be trivial to reproduce.

[espruino-discuss]

Posted at 2016-08-15 by tve

No gdb :-). But I should be able to add the jsvTrace.

[gfwilliams]

Posted at 2016-08-15 by @gfwilliams

Ahh, yeah :) I guess an assert_with_var would be cool, and then it could trace the offending variable if the assert failed.