Subj : Re: Longjmp in error reporters?
To   : Alain Frisch
From : Brendan Eich
Date : Fri May 27 2005 08:33 pm

Alain Frisch wrote:
> Alain Frisch wrote:
> 
>> Hello,
>>
>> I'm embedding SpiderMonkey in a language with a notion of exceptions. 
>> Raising an exception is internally implemented with a longjmp.
>>
>> Is it safe to throw such an exception from an JSErrorReporter?
>> It would escape from the JS evaluator. I'm worried about its internal 
>> state...
> 
> 
> At least the error message should be released by hand... Ok, I guess 
> this is not a good idea. I will just copy the error in a global
> variable, and throw the exception after the evaluator has returned.


Yes, in general JS_* API entry points, and their js_* and static 
function underpinnings, may manually allocate resources.  There is no 
unwind-protect with longjmp, so you have to know what you are doing.

/be

.