Subj : spidermonkey "advanced" error reporting
To   : netscape.public.mozilla.jseng
From : Jens Thiele
Date : Sun Apr 25 2004 02:52 pm

I am currently using JS_ReportError to report errors in native code
and have registered my error handling function
but JS_ReportError does not throw an Javscript exception like
spidermonkey itself does.
Example which should demonstrate my problem:
bar is not defined
print is my native function which calls JS_ReportError when it gets more
than one argument (otherwise it does what is expected from a print function)

function foo()
{
        bar();
}
try{
        eval("foo();");
}catch(error){
        println(error);
        println(error.stack);
}
try{
        eval("print(1,2,2);");
}catch(error){
        println(error);
        println(error.stack);
}

my output looks like this

ReferenceError: bar is not defined
foo()@/tmp/test.js:3
@/tmp/test.js:6
@/tmp/test.js:6

JSERROR: /tmp/test.js:12:
    Wrong number of arguments: expect 1, got 3
    Flags: (Error number: 0)


=> the first error throws an exception and with the exception
it is possible to get enough info to find the error

the second error does not throw an exception and it is nearly impossible
to find the error if it is nested somewhere in an eval
or in a native function which calls back javascript again
( JS->C->JS->C->JS_ReportError...)

so my question is how to throw an exception or how to get a stack trace
otherwise

is
JS_SetPendingException(JSContext *cx, jsval v);
the way to go?
but then it seems impossible to inititalize the exception object with
the public api?

greetings
karme

.