CODEWITHSUNDEEP
debuggingocaml
Ed McMan
Ed McMan

Reputation: 529

Is it possible to break on a handled exception in OCaml?

Debugging an OCaml program that has an unhandled exception is fairly easy, because the program stops running and you can obtain a backtrace by running in ocamldebug or setting the OCAMLRUNPARAM environment variable to b. Is there any way to obtain such a backtrace for a handled exception?

Note: Modifying the program so it does not handle the exception is of course one option. However, I'd like to avoid modifying the program if possible. Something analogous to gdb's catch command would be great.

Upvotes: 1

Views: 314

Answers (1)

Jeffrey Scofield
Jeffrey Scofield

Reputation: 66818

There is a function Printexc.print_backtrace that will print a backtrace showing the stack from the point the exception was raised to the current point where the exception is being handled. This might help, though note that it doesn't print a full stack backtrace.

I once wrote some hacky code using Unix.fork that prints a full stack backtrace on a Unix-like system. See my answer to printing stack traces. (I wouldn't suggest using this code in production.)

Upvotes: 2

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