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cli: make ^C print a JS stack trace #24937

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@bnoordhuis

It would be exceedingly nice for debugging non-responsive scripts if terminating the process with ^C / SIGINT prints a JS stack trace leading up to the currently executing code.

The use case is scripts stuck in (for example) infinite loops. Right now you don't really get an indication when that's happening except CPU usage in top.

It might be hard to pull off because signal handlers but maybe someone has a clever idea. My attempt at being clever:

  1. Route signals to a watchdog thread instead of the main thread
  2. Call isolate->RequestInterrupt() when a signal is received.
  3. Collect the stack trace in the interrupt handler.
  4. Either re-raise the signal on the main thread to terminate as usual, or raise a termination exception to kill the script.

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    cliIssues and PRs related to the Node.js command-line interface.feature requestIssues requesting new Node.js features.

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