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Diffstat (limited to 'compiler/GHC/Parser/Errors/Types.hs')
| -rw-r--r-- | compiler/GHC/Parser/Errors/Types.hs | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/compiler/GHC/Parser/Errors/Types.hs b/compiler/GHC/Parser/Errors/Types.hs index 38c54b7149..88a287d69b 100644 --- a/compiler/GHC/Parser/Errors/Types.hs +++ b/compiler/GHC/Parser/Errors/Types.hs @@ -15,6 +15,7 @@ import GHC.Types.Name.Occurrence (OccName) import GHC.Types.Name.Reader import GHC.Unit.Module.Name import GHC.Utils.Outputable +import GHC.Platform.ArchOS -- The type aliases below are useful to make some type signatures a bit more -- descriptive, like 'handleWarningsThrowErrors' in 'GHC.Driver.Main'. @@ -22,6 +23,24 @@ import GHC.Utils.Outputable type PsWarning = PsMessage -- /INVARIANT/: The diagnosticReason is a Warning reason type PsError = PsMessage -- /INVARIANT/: The diagnosticReason is ErrorWithoutFlag +{- +Note [Messages from GHC.Parser.Header +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +We group the messages from 'GHC.Parser.Header' because we need to +be able to pattern match on them in the driver code. This is because +in functions like 'GHC.Driver.Pipeline.preprocess' we want to handle +only a specific subset of parser messages, during dependency analysis, +and having a single constructor to handle them all is handy. + +-} + +data PsHeaderMessage + = PsErrParseLanguagePragma + | PsErrUnsupportedExt !String !ArchOS + | PsErrParseOptionsPragma !String + + data PsMessage = {-| An \"unknown\" message from the parser. This type constructor allows @@ -30,6 +49,11 @@ data PsMessage -} forall a. (Diagnostic a, Typeable a) => PsUnknownMessage a + {-| A group of parser messages emitted in 'GHC.Parser.Header'. + See Note [Messages from GHC.Parser.Header]. + -} + | PsHeaderMessage !PsHeaderMessage + {-| PsWarnTab is a warning (controlled by the -Wwarn-tabs flag) that occurs when tabulations (tabs) are found within a file. |