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[ refactor ] Improve error handling in Core #3434

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@spcfox spcfox commented Dec 3, 2024

Description

  • Added utility functions to handle errors in Core.
  • Added new error types: NonZeroExitCode, SystemError, CodegenNotFound, UnsupportedOpertaion.
  • Added error handling in many places where they were ignored.
  • All coreLift_ calls replaced by explicit result processing.
  • Removed Maybe from compileExpr and incCompileFile signatures. Instead of returning Nothing, throw is used. Earlier both variants were found in the code. Using throw allows you to pass a more clear error.
  • fix Successful exit code after error in --exec #3427: the --exec command returns the program exit code. If several --exec options are passed, the result of the last execution will be returned.
  • Removed CompilationFailed from REPLResult. More specific errors using throw are returned instead.

Should this change go in the CHANGELOG?

  • If this is a fix, user-facing change, a compiler change, or a new paper
    implementation, I have updated CHANGELOG_NEXT.md (and potentially also
    CONTRIBUTORS.md).

@spcfox spcfox marked this pull request as draft December 3, 2024 13:41
src/Compiler/ES/Node.idr Outdated Show resolved Hide resolved
src/Compiler/RefC/RefC.idr Outdated Show resolved Hide resolved
ok <- coreLift $ system cmd
if ok == 0
then pure (Just execPath)
else pure Nothing
safeSystem cmd
pure (Just execPath)
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This is not logically equivalent. Why is it legitimate to drop the Nothing branch?

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safeSystem throws an error if the exit code is not zero. This makes the errors more clear

Comment on lines 453 to 460
when mkexec $ logTime 1 "Build racket" $
safeSystem $ raco ++ ["-o", outBinAbs, outRktAbs]

-- TODO: add launcher script
let outShRel = outputDir </> outfile
makeShPlatform isWindows (if mkexec then "" else racket ++ " ") outShRel appDirRel outRktFile
handleFileError outShRel $ chmodRaw outShRel 0o755
pure (Just outShRel)
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Again we're also dropping the Nothing branch

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@spcfox spcfox Dec 3, 2024

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safeSystem throw NonZeroExitCode. I replaced all Nothing with throw. Currently Nothing just wraps around to CompilationFailed. A more specific cause of the error is passed to throw.

Idris2/src/Idris/REPL.idr

Lines 815 to 818 in ec74792

ok <- compile cg tm_erased outfile
maybe (pure CompilationFailed)
(pure . Compiled)
ok

src/Compiler/ES/Node.idr Outdated Show resolved Hide resolved
@spcfox spcfox marked this pull request as ready for review December 4, 2024 12:41
(tmpDir : String) -> ClosedTerm -> Core ExitCode
executeExpr c s tmpDir tm = do
out <- compileExpr False c s tmpDir tmpDir tm "_tmpchez"
system $ escapeArg out
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I think an explicit escapeArg is clearer than a single element list

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spcfox commented Dec 9, 2024

This PR is ready for review. The lsp build is failing because I deleted CompilationFailed. I have not yet made a PR fixing this because I allow for the possibility of revising this decision during review.

@spcfox spcfox requested a review from gallais December 9, 2024 15:28
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Successful exit code after error in --exec
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