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UnsupportedOperationException with --search in OCaml backend

See original GitHub issue

Get Nightly build of K framework at commit 3af731f Prebuilt K binary
Open terminal and change into tutorial/1_k/1_lambda/lesson_1
Run kompile --backend ocaml lambda.k
Run krun --search --debug tests/identity.lambda

This occurs with Kool untyped as well. Running without --search is fine, though. I’m running OCaml 4.03.1+dev0-2016-04-25 on Linux Mint 18.3.

java.lang.UnsupportedOperationException
	at org.kframework.backend.ocaml.OcamlRewriter$1.search(OcamlRewriter.java:116)
	at org.kframework.krun.modes.KRunExecutionMode.execute(KRunExecutionMode.java:55)
	at org.kframework.krun.KRun.run(KRun.java:99)
	at org.kframework.krun.KRunFrontEnd.run(KRunFrontEnd.java:90)
	at org.kframework.main.FrontEnd.main(FrontEnd.java:52)
	at org.kframework.main.Main.runApplication(Main.java:114)
	at org.kframework.main.Main.runApplication(Main.java:104)
	at org.kframework.main.Main.main(Main.java:53)
java.lang.UnsupportedOperationException
	at org.kframework.backend.ocaml.OcamlRewriter$1.search(OcamlRewriter.java:116)
	at org.kframework.krun.modes.KRunExecutionMode.execute(KRunExecutionMode.java:55)
	at org.kframework.krun.KRun.run(KRun.java:99)
	at org.kframework.krun.KRunFrontEnd.run(KRunFrontEnd.java:90)
	at org.kframework.main.FrontEnd.main(FrontEnd.java:52)
	at org.kframework.main.Main.runApplication(Main.java:114)
	at org.kframework.main.Main.runApplication(Main.java:104)
	at org.kframework.main.Main.main(Main.java:53)
[Error] Internal: Uncaught exception thrown of type
UnsupportedOperationException.
Please rerun your program with the --debug flag to generate a stack trace, and
file a bug report at https://github.com/kframework/k/issues (null)

Issue Analytics

State:
Created 5 years ago
Comments:5 (3 by maintainers)

Top GitHub Comments

1reaction

dwightguthcommented, Jan 3, 2019

Judging from your stack trace, it looks like a kserver is active, which probably means that you previously compiled this definition with the ocaml backend and the kserver cached the definition when you tried to run it. Then you switched to the java backend, but the kserver was never written to robustly invalidate caches when you recompile a definition, so it still thinks the definition has been built with the ocaml backend. If you run stop-kserver and then run these commands again, it should work. It might be slower though. Generally you should always stop and restart any kserver you started whenever you run kompile more than once on the same definition.

0reactions

ehildenbcommented, Jul 1, 2019

Seems resolved. For the record, as @dwightguth says, krun --search is not supported by the ocaml backend (only by Java and Haskell backends), and the KServer causes issues with cacheing between kompile calls. This led to weird behavior when first running with ocaml backend then trying to switch to java backend for search.

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