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Created February 20, 2013 12:29
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Opera .stack / .stacktrace madness
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index.html
<!doctype html>
<title>Stackgen</title>
<script src="stackgen.js"></script>
<script>
try {
stackgen();
} catch(e) {
ex = e;
throw e;
}
</script>
Raw
stackgen.js
function stackgen() {
newFrame();
}
function newFrame() {
badCall();
}
@rakeshpai
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Following all done in Opera/11.6.

When accessing ex.stacktrace for the first time, I sometimes get the following (reload if you don't):

"

Error thrown at line 6, column 1 in http://localhost:8080/:
    throw e;

Error initially occurred at line 6, column 1 in newFrame() in http://localhost:8080/stackgen.js:
    badCall();
called from line 2, column 1 in stackgen() in http://localhost:8080/stackgen.js:
    newFrame();
called from line 3, column 1 in http://localhost:8080/:
    stackgen();"

(Yes, it has the superflous newlines)

Accessing the .stacktrace property multiple times consistently gives the same result.

Now, access ex.stack. You'll get something like this:

"newFrame([arguments not available])@http://localhost:8080/stackgen.js:6
stackgen([arguments not available])@http://localhost:8080/stackgen.js:2
@http://localhost:8080/:3"

All fine. Now, access ex.stacktrace again. I get this:

"Error thrown at line 6, column 1 in newFrame() in http://localhost:8080/stackgen.js:
    badCall();
called from line 2, column 1 in stackgen() in http://localhost:8080/stackgen.js:
    newFrame();
called from line 3, column 1 in http://localhost:8080/:
    stackgen();"

I haven't changed anything in ex. Why is .stacktrace different before and after accessing .stack?

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