------------------------------------------------------------------------------
---
+-- |
-- Dynamic flags
--
--
-- (c) The University of Glasgow 2005
--
------------------------------------------------------------------------------
--- | Most flags are dynamic flags, which means they can change from
+-- Most flags are dynamic flags, which means they can change from
-- compilation to compilation using @OPTIONS_GHC@ pragmas, and in a
-- multi-session GHC each session can be using different dynamic
-- flags. Dynamic flags can also be set at the prompt in GHCi.
import UniqFM ( UniqFM )
import Util
import Maybes ( orElse )
-import SrcLoc ( SrcSpan )
+import SrcLoc
import FastString
import Outputable
import {-# SOURCE #-} ErrUtils ( Severity(..), Message, mkLocMessage )
| Opt_TemplateHaskell
| Opt_QuasiQuotes
| Opt_ImplicitParams
- | Opt_Generics
+ | Opt_Generics -- "Derivable type classes"
| Opt_ImplicitPrelude
| Opt_ScopedTypeVariables
| Opt_UnboxedTuples
stgToDo :: Maybe [StgToDo], -- similarly
hscTarget :: HscTarget,
hscOutName :: String, -- ^ Name of the output file
- extCoreName :: String, -- ^ Name of the .core output file
+ extCoreName :: String, -- ^ Name of the .hcr output file
verbosity :: Int, -- ^ Verbosity level: see "DynFlags#verbosity_levels"
optLevel :: Int, -- ^ Optimisation level
simplPhases :: Int, -- ^ Number of simplifier phases
dphBackend :: DPHBackend,
- thisPackage :: PackageId,
+ thisPackage :: PackageId, -- ^ name of package currently being compiled
-- ways
wayNames :: [WayName], -- ^ Way flags from the command line
ghcUsagePath = panic "defaultDynFlags: No ghciUsagePath",
ghciUsagePath = panic "defaultDynFlags: No ghciUsagePath",
topDir = panic "defaultDynFlags: No topDir",
- systemPackageConfig = panic "defaultDynFlags: No systemPackageConfig",
+ systemPackageConfig = panic "no systemPackageConfig: call GHC.setSessionDynFlags",
pgm_L = panic "defaultDynFlags: No pgm_L",
pgm_P = panic "defaultDynFlags: No pgm_P",
pgm_F = panic "defaultDynFlags: No pgm_F",
( "ImplicitParams", Opt_ImplicitParams, const Supported ),
( "ScopedTypeVariables", Opt_ScopedTypeVariables, const Supported ),
- -- -XPatternSignatures is deprecated; now -XScopedTypeVariables enables pattern signatures
( "PatternSignatures", Opt_ScopedTypeVariables,
deprecatedForLanguage "ScopedTypeVariables" ),
( "PackageImports", Opt_PackageImports, const Supported )
]
-impliedFlags :: [(DynFlag, [DynFlag])]
-impliedFlags = [
- ( Opt_GADTs, [Opt_RelaxedPolyRec] ) -- We want type-sig variables to
- -- be completely rigid for GADTs
- , ( Opt_ScopedTypeVariables, [Opt_RelaxedPolyRec] ) -- Ditto for scoped type variables; see
- -- Note [Scoped tyvars] in TcBinds
+impliedFlags :: [(DynFlag, DynFlag)]
+impliedFlags
+ = [ (Opt_GADTs, Opt_RelaxedPolyRec) -- We want type-sig variables to
+ -- be completely rigid for GADTs
+
+ , (Opt_ScopedTypeVariables, Opt_RelaxedPolyRec) -- Ditto for scoped type variables; see
+ -- Note [Scoped tyvars] in TcBinds
]
glasgowExtsFlags :: [DynFlag]
-- -----------------------------------------------------------------------------
-- Parsing the dynamic flags.
-parseDynamicFlags :: DynFlags -> [String] -> IO (DynFlags, [String], [String])
+-- | Parse dynamic flags from a list of command line argument. Returns the
+-- the parsed 'DynFlags', the left-over arguments, and a list of warnings.
+-- Throws a 'UsageError' if errors occurred during parsing (such as unknown
+-- flags or missing arguments).
+parseDynamicFlags :: Monad m =>
+ DynFlags -> [Located String]
+ -> m (DynFlags, [Located String], [Located String])
+ -- ^ Updated 'DynFlags', left-over arguments, and
+ -- list of warnings.
parseDynamicFlags dflags args = do
-- XXX Legacy support code
-- We used to accept things like
-- optdep -f -optdepdepend
-- optdep -f -optdep depend
-- but the spaces trip up proper argument handling. So get rid of them.
- let f ("-optdep" : x : xs) = ("-optdep" ++ x) : f xs
+ let f (L p "-optdep" : L _ x : xs) = (L p ("-optdep" ++ x)) : f xs
f (x : xs) = x : f xs
f xs = xs
args' = f args
let ((leftover, errs, warns), dflags')
= runCmdLine (processArgs dynamic_flags args') dflags
- when (not (null errs)) $ do
- ghcError (UsageError (unlines errs))
+ when (not (null errs)) $ ghcError $ errorsToGhcException errs
return (dflags', leftover, warns)
type DynP = CmdLineP DynFlags
--------------------------
setDynFlag, unSetDynFlag :: DynFlag -> DynP ()
-setDynFlag f = upd (\dfs -> foldl dopt_set (dopt_set dfs f) deps)
+setDynFlag f = do { upd (\dfs -> dopt_set dfs f)
+ ; mapM_ setDynFlag deps }
where
- deps = [ d | (f', ds) <- impliedFlags, f' == f, d <- ds ]
+ deps = [ d | (f', d) <- impliedFlags, f' == f ]
-- When you set f, set the ones it implies
+ -- NB: use setDynFlag recursively, in case the implied flags
+ -- implies further flags
-- When you un-set f, however, we don't un-set the things it implies
-- (except for -fno-glasgow-exts, which is treated specially)