Unable to start profiling: TypeError: Cannot read properties of undefined (reading 'frames') #282
Description
somehow I hit this problem. at a specific section in my (rather simple) demo I cannot profile. When hitting the profile (single) button I am getting this error. I have tried to debug what is going on up to a certain point.
the problematic section in the code is profileTimeFrame()
const l = this.sourceMap.uniqueLines[this.sourceMap.lines[pc >> 1]];
if (l === undefined) {
console.log(pc >> 1);
console.log(Object.keys(this.sourceMap.lines));
console.log(this.sourceMap.lines[pc >> 1]);
// console.log(this.sourceMap.uniqueLines);
for (let i = l.frames.length - 1; i >= 0; i--) {
callstack.frames.unshift({ ...l.frames[i] });
if (i !== 0)
callstack.frames[0].func += " (inlined)";
}
}
I have hacked the specific section and the problem is that l is undefined. so iterating l.frames will just throw this error.
this is the output that I am seeing in the console using this thing:
-52921
(2051) ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15', '16', '17', '18', '19', '20', '21', '22', '23', '24', '25', '26', '27', '28', '29', '30', '31', '32', '33', '34', '35', '36', '37', '38', '39', '40', '41', '42', '43', '44', '45', '46', '47', '48', '49', '50', '51', '52', '53', '54', '55', '56', '57', '58', '59', '60', '61', '62', '63', '64', '65', '66', '67', '68', '69', '70', '71', '72', '73', '74', '75', '76', '77', '78', '79', '80', '81', '82', '83', '84', '85', '86', '87', '88', '89', '90', '91', '92', '93', '94', '95', '96', '97', '98', '99', …]
undefined
From what I get the extension does some raw snapshot and then converts it into json and that seems to fail. I have found some raw data in the /tmp folder which I hope is the right stuff and eventually helpful 🙏
in a later section of the demo profiling works. it is totally possible that I have a bug in my code that is why I wanted to have a look in the profiler 😂 maybe this possible bug triggers something.