I was just playing around with V8 Stack Trace API and came up with the
following stupid code:
var log = console.log;
log(process.versions);
Error.stackTraceLimit = Infinity;
Error.prepareStackTrace = function(err, stack) {
return stack;
};
function printST() {
var obj = {};
Error.captureStackTrace(obj, printST);
log('\tStack length: ' + obj.stack.length);
}
log('Initiation:');
printST();
function recur(n) {
if(n > 1) {
return recur(--n);
}
log('recur():');
printST();
}
for(var i = 1; i <= 10; i++) {
log(i + '/');
recur(1000);
}
Which prints:
> { http_parser: '2.2',
>
> node: '0.11.13',
>
> v8: '3.25.30',
>
> uv: '0.11.25',
>
> zlib: '1.2.3',
>
> modules: '14',
>
> openssl: '1.0.1g' }
>
> Initiation:
>
> Stack length: 8
>
> 1/
>
> recur():
>
> Stack length: 1008
>
> 2/
>
> recur():
>
> Stack length: 1008
>
> 3/
>
> recur():
>
> Stack length: 0
>
> 4/
>
> recur():
>
> Stack length: 1008
>
> 5/
>
> recur():
>
> Stack length: 0
>
> 6/
>
> recur():
>
> Stack length: 1008
>
> 7/
>
> recur():
>
> Stack length: 0
>
> 8/
>
> recur():
>
> Stack length: 0
>
> 9/
>
> recur():
>
> Stack length: 0
>
> 10/
>
> recur():
>
> Stack length: 0
>
> Is that expected behavior? And if so, could anyone please explain it? I
think it involve some kind of optimization that V8 does because different
versions of node print different outputs. For example:
> { http_parser: '1.0',
>
> node: '0.10.29',
>
> v8: '3.14.5.9',
>
> ares: '1.9.0-DEV',
>
> uv: '0.10.27',
>
> zlib: '1.2.3',
>
> modules: '11',
>
> openssl: '1.0.1h' }
>
> Initiation:
>
> Stack length: 8
>
> 1/
>
> recur():
>
> Stack length: 1008
>
> 2/
>
> recur():
>
> Stack length: 0
>
> 3/
>
> recur():
>
> Stack length: 0
>
> 4/
>
> recur():
>
> Stack length: 0
>
> 5/
>
> recur():
>
> Stack length: 0
>
> 6/
>
> recur():
>
> Stack length: 0
>
> 7/
>
> recur():
>
> Stack length: 0
>
> 8/
>
> recur():
>
> Stack length: 0
>
> 9/
>
> recur():
>
> Stack length: 0
>
> 10/
>
> recur():
>
> Stack length: 0
>
>
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