X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2FhsSyn%2FHsDecls.lhs;h=8ff39857c610ab4d4af4e3ef09c914af3818651a;hb=28a464a75e14cece5db40f2765a29348273ff2d2;hp=5be8245edc17dee763d11b260065bec2590d8f94;hpb=98b5d9f61854afb1ed4c8cf819154c1b89eb88bf;p=ghc-hetmet.git diff --git a/ghc/compiler/hsSyn/HsDecls.lhs b/ghc/compiler/hsSyn/HsDecls.lhs index 5be8245..8ff3985 100644 --- a/ghc/compiler/hsSyn/HsDecls.lhs +++ b/ghc/compiler/hsSyn/HsDecls.lhs @@ -8,44 +8,49 @@ Definitions for: @TyDecl@ and @oCnDecl@, @ClassDecl@, \begin{code} module HsDecls ( - HsDecl(..), TyClDecl(..), InstDecl(..), RuleDecl(..), RuleBndr(..), - DefaultDecl(..), - ForeignDecl(..), FoImport(..), FoExport(..), FoType(..), - ConDecl(..), ConDetails(..), - BangType(..), getBangType, getBangStrictness, unbangedType, - DeprecDecl(..), DeprecTxt, - hsDeclName, instDeclName, - tyClDeclName, tyClDeclNames, tyClDeclSysNames, tyClDeclTyVars, - isClassDecl, isSynDecl, isDataDecl, isIfaceSigDecl, countTyClDecls, - mkClassDeclSysNames, isIfaceRuleDecl, ifaceRuleDeclName, - getClassDeclSysNames, conDetailsTys + HsDecl(..), LHsDecl, TyClDecl(..), LTyClDecl, + InstDecl(..), LInstDecl, NewOrData(..), + RuleDecl(..), LRuleDecl, RuleBndr(..), + DefaultDecl(..), LDefaultDecl, SpliceDecl(..), + ForeignDecl(..), LForeignDecl, ForeignImport(..), ForeignExport(..), + CImportSpec(..), FoType(..), + ConDecl(..), ResType(..), LConDecl, + DeprecDecl(..), LDeprecDecl, + HsGroup(..), emptyRdrGroup, emptyRnGroup, appendGroups, + tcdName, tyClDeclNames, tyClDeclTyVars, + isClassDecl, isSynDecl, isDataDecl, + countTyClDecls, + conDetailsTys, + collectRuleBndrSigTys, ) where #include "HsVersions.h" -- friends: -import HsBinds ( HsBinds, MonoBinds, Sig(..), FixitySig(..) ) -import HsExpr ( HsExpr ) +import {-# SOURCE #-} HsExpr( HsExpr, pprExpr ) + -- Because Expr imports Decls via HsBracket + +import HsBinds ( HsValBinds(..), HsBind, LHsBinds, plusHsValBinds, + Sig(..), LSig, LFixitySig, pprLHsBinds, + emptyValBindsIn, emptyValBindsOut ) +import HsPat ( HsConDetails(..), hsConArgs ) +import HsImpExp ( pprHsVar ) import HsTypes -import PprCore ( pprCoreRule ) -import HsCore ( UfExpr, UfBinder, HsIdInfo, pprHsIdInfo, - eq_ufBinders, eq_ufExpr, pprUfExpr - ) -import CoreSyn ( CoreRule(..) ) -import BasicTypes ( NewOrData(..), StrictnessMark(..) ) -import ForeignCall ( CExportSpec, CCallSpec, DNCallSpec, CCallConv ) +import NameSet ( NameSet ) +import HscTypes ( DeprecTxt ) +import CoreSyn ( RuleName ) +import Kind ( Kind, pprKind ) +import BasicTypes ( Activation(..) ) +import ForeignCall ( CCallTarget(..), DNCallSpec, CCallConv, Safety, + CExportSpec(..), CLabelString ) -- others: -import Name ( NamedThing ) import FunDeps ( pprFundeps ) -import Class ( FunDep, DefMeth(..) ) -import CStrings ( CLabelString ) +import Class ( FunDep ) import Outputable -import Util ( eqListBy ) -import SrcLoc ( SrcLoc ) +import Util ( count ) +import SrcLoc ( Located(..), unLoc, noLoc ) import FastString - -import Maybe ( isNothing, fromJust ) \end{code} @@ -56,18 +61,21 @@ import Maybe ( isNothing, fromJust ) %************************************************************************ \begin{code} -data HsDecl name pat - = TyClD (TyClDecl name pat) - | InstD (InstDecl name pat) - | DefD (DefaultDecl name) - | ValD (HsBinds name pat) - | ForD (ForeignDecl name) - | FixD (FixitySig name) - | DeprecD (DeprecDecl name) - | RuleD (RuleDecl name pat) +type LHsDecl id = Located (HsDecl id) + +data HsDecl id + = TyClD (TyClDecl id) + | InstD (InstDecl id) + | ValD (HsBind id) + | SigD (Sig id) + | DefD (DefaultDecl id) + | ForD (ForeignDecl id) + | DeprecD (DeprecDecl id) + | RuleD (RuleDecl id) + | SpliceD (SpliceDecl id) -- NB: all top-level fixity decls are contained EITHER --- EITHER FixDs +-- EITHER SigDs -- OR in the ClassDecls in TyClDs -- -- The former covers @@ -78,40 +86,100 @@ data HsDecl name pat -- d) top level decls -- -- The latter is for class methods only -\end{code} - -\begin{code} -#ifdef DEBUG -hsDeclName :: (NamedThing name, Outputable name, Outputable pat) - => HsDecl name pat -> name -#endif -hsDeclName (TyClD decl) = tyClDeclName decl -hsDeclName (InstD decl) = instDeclName decl -hsDeclName (ForD decl) = forDeclName decl -hsDeclName (FixD (FixitySig name _ _)) = name --- Others don't make sense -#ifdef DEBUG -hsDeclName x = pprPanic "HsDecls.hsDeclName" (ppr x) -#endif - - -instDeclName :: InstDecl name pat -> name -instDeclName (InstDecl _ _ _ (Just name) _) = name +-- A [HsDecl] is categorised into a HsGroup before being +-- fed to the renamer. +data HsGroup id + = HsGroup { + hs_valds :: HsValBinds id, + hs_tyclds :: [LTyClDecl id], + hs_instds :: [LInstDecl id], + + hs_fixds :: [LFixitySig id], + -- Snaffled out of both top-level fixity signatures, + -- and those in class declarations + + hs_defds :: [LDefaultDecl id], + hs_fords :: [LForeignDecl id], + hs_depds :: [LDeprecDecl id], + hs_ruleds :: [LRuleDecl id] + } + +emptyGroup, emptyRdrGroup, emptyRnGroup :: HsGroup a +emptyRdrGroup = emptyGroup { hs_valds = emptyValBindsIn } +emptyRnGroup = emptyGroup { hs_valds = emptyValBindsOut } + +emptyGroup = HsGroup { hs_tyclds = [], hs_instds = [], + hs_fixds = [], hs_defds = [], hs_fords = [], + hs_depds = [], hs_ruleds = [], + hs_valds = error "emptyGroup hs_valds: Can't happen" } + +appendGroups :: HsGroup a -> HsGroup a -> HsGroup a +appendGroups + HsGroup { + hs_valds = val_groups1, + hs_tyclds = tyclds1, + hs_instds = instds1, + hs_fixds = fixds1, + hs_defds = defds1, + hs_fords = fords1, + hs_depds = depds1, + hs_ruleds = rulds1 } + HsGroup { + hs_valds = val_groups2, + hs_tyclds = tyclds2, + hs_instds = instds2, + hs_fixds = fixds2, + hs_defds = defds2, + hs_fords = fords2, + hs_depds = depds2, + hs_ruleds = rulds2 } + = + HsGroup { + hs_valds = val_groups1 `plusHsValBinds` val_groups2, + hs_tyclds = tyclds1 ++ tyclds2, + hs_instds = instds1 ++ instds2, + hs_fixds = fixds1 ++ fixds2, + hs_defds = defds1 ++ defds2, + hs_fords = fords1 ++ fords2, + hs_depds = depds1 ++ depds2, + hs_ruleds = rulds1 ++ rulds2 } \end{code} \begin{code} -instance (NamedThing name, Outputable name, Outputable pat) - => Outputable (HsDecl name pat) where - +instance OutputableBndr name => Outputable (HsDecl name) where ppr (TyClD dcl) = ppr dcl ppr (ValD binds) = ppr binds ppr (DefD def) = ppr def ppr (InstD inst) = ppr inst ppr (ForD fd) = ppr fd - ppr (FixD fd) = ppr fd + ppr (SigD sd) = ppr sd ppr (RuleD rd) = ppr rd ppr (DeprecD dd) = ppr dd + ppr (SpliceD dd) = ppr dd + +instance OutputableBndr name => Outputable (HsGroup name) where + ppr (HsGroup { hs_valds = val_decls, + hs_tyclds = tycl_decls, + hs_instds = inst_decls, + hs_fixds = fix_decls, + hs_depds = deprec_decls, + hs_fords = foreign_decls, + hs_defds = default_decls, + hs_ruleds = rule_decls }) + = vcat [ppr_ds fix_decls, ppr_ds default_decls, + ppr_ds deprec_decls, ppr_ds rule_decls, + ppr val_decls, + ppr_ds tycl_decls, ppr_ds inst_decls, + ppr_ds foreign_decls] + where + ppr_ds [] = empty + ppr_ds ds = text "" $$ vcat (map ppr ds) + +data SpliceDecl id = SpliceDecl (Located (HsExpr id)) -- Top level splice + +instance OutputableBndr name => Outputable (SpliceDecl name) where + ppr (SpliceDecl e) = ptext SLIT("$") <> parens (pprExpr (unLoc e)) \end{code} @@ -125,8 +193,8 @@ instance (NamedThing name, Outputable name, Outputable pat) THE NAMING STORY -------------------------------- -Here is the story about the implicit names that go with type, class, and instance -decls. It's a bit tricky, so pay attention! +Here is the story about the implicit names that go with type, class, +and instance decls. It's a bit tricky, so pay attention! "Implicit" (or "system") binders ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ @@ -139,7 +207,8 @@ decls. It's a bit tricky, so pay attention! the worker for that constructor a selector for each superclass -All have occurrence names that are derived uniquely from their parent declaration. +All have occurrence names that are derived uniquely from their parent +declaration. None of these get separate definitions in an interface file; they are fully defined by the data or class decl. But they may *occur* in @@ -147,15 +216,16 @@ interface files, of course. Any such occurrence must haul in the relevant type or class decl. Plan of attack: - - Make up their occurrence names immediately - This is done in RdrHsSyn.mkClassDecl, mkTyDecl, mkConDecl - - Ensure they "point to" the parent data/class decl when loading that decl from an interface file - (See RnHiFiles.getTyClDeclSysNames) + (See RnHiFiles.getSysBinders) - - When renaming the decl look them up in the name cache, - ensure correct module and provenance is set + - When typechecking the decl, we build the implicit TyCons and Ids. + When doing so we look them up in the name cache (RnEnv.lookupSysName), + to ensure correct module and provenance is set + +These are the two places that we have to conjure up the magic derived +names. (The actual magic is in OccName.mkWorkerOcc, etc.) Default methods ~~~~~~~~~~~~~~~ @@ -172,6 +242,7 @@ Here's the deal. (We distinguish the two cases because source-code decls have (Just binds) in the tcdMeths field, whereas interface decls have Nothing. In *source-code* class declarations: + - When parsing, every ClassOpSig gets a DefMeth with a suitable RdrName This is done by RdrHsSyn.mkClassOpSigDM @@ -233,7 +304,7 @@ Source code: instance Foo [Bool] where ... These might both be dFooList - - The CoreTidy phase globalises the name, and ensures the occurrence name is + - The CoreTidy phase externalises the name, and ensures the occurrence name is unique (this isn't special to dict funs). So we'd get dFooList and dFooList1. - We can take this relaxed approach (changing the occurrence name later) @@ -257,58 +328,58 @@ Interface file code: -- for a module. That's why (despite the misnomer) IfaceSig and ForeignType -- are both in TyClDecl -data TyClDecl name pat - = IfaceSig { tcdName :: name, -- It may seem odd to classify an interface-file signature - tcdType :: HsType name, -- as a 'TyClDecl', but it's very convenient. - tcdIdInfo :: [HsIdInfo name], - tcdLoc :: SrcLoc - } +type LTyClDecl name = Located (TyClDecl name) - | ForeignType { tcdName :: name, -- See remarks about IfaceSig above - tcdExtName :: Maybe FastString, - tcdFoType :: FoType, - tcdLoc :: SrcLoc } +data TyClDecl name + = ForeignType { + tcdLName :: Located name, + tcdExtName :: Maybe FastString, + tcdFoType :: FoType + } | TyData { tcdND :: NewOrData, - tcdCtxt :: HsContext name, -- context - tcdName :: name, -- type constructor - tcdTyVars :: [HsTyVarBndr name], -- type variables - tcdCons :: [ConDecl name], -- data constructors (empty if abstract) - tcdNCons :: Int, -- Number of data constructors (valid even if type is abstract) - tcdDerivs :: Maybe [name], -- derivings; Nothing => not specified - -- (i.e., derive default); Just [] => derive - -- *nothing*; Just => as you would - -- expect... - tcdSysNames :: DataSysNames name, -- Generic converter functions - tcdLoc :: SrcLoc + tcdCtxt :: LHsContext name, -- Context + tcdLName :: Located name, -- Type constructor + tcdTyVars :: [LHsTyVarBndr name], -- Type variables + tcdKindSig :: Maybe Kind, -- Optional kind sig; + -- (only for the 'where' form) + + tcdCons :: [LConDecl name], -- Data constructors + -- For data T a = T1 | T2 a the LConDecls all have ResTyH98 + -- For data T a where { T1 :: T a } the LConDecls all have ResTyGADT + + tcdDerivs :: Maybe [LHsType name] + -- Derivings; Nothing => not specified + -- Just [] => derive exactly what is asked + -- These "types" must be of form + -- forall ab. C ty1 ty2 + -- Typically the foralls and ty args are empty, but they + -- are non-empty for the newtype-deriving case } - | TySynonym { tcdName :: name, -- type constructor - tcdTyVars :: [HsTyVarBndr name], -- type variables - tcdSynRhs :: HsType name, -- synonym expansion - tcdLoc :: SrcLoc + | TySynonym { tcdLName :: Located name, -- type constructor + tcdTyVars :: [LHsTyVarBndr name], -- type variables + tcdSynRhs :: LHsType name -- synonym expansion } - | ClassDecl { tcdCtxt :: HsContext name, -- Context... - tcdName :: name, -- Name of the class - tcdTyVars :: [HsTyVarBndr name], -- The class type variables - tcdFDs :: [FunDep name], -- Functional dependencies - tcdSigs :: [Sig name], -- Methods' signatures - tcdMeths :: Maybe (MonoBinds name pat), -- Default methods - -- Nothing for imported class decls - -- Just bs for source class decls - tcdSysNames :: ClassSysNames name, - tcdLoc :: SrcLoc + | ClassDecl { tcdCtxt :: LHsContext name, -- Context... + tcdLName :: Located name, -- Name of the class + tcdTyVars :: [LHsTyVarBndr name], -- Class type variables + tcdFDs :: [Located (FunDep name)], -- Functional deps + tcdSigs :: [LSig name], -- Methods' signatures + tcdMeths :: LHsBinds name -- Default methods } + +data NewOrData + = NewType -- "newtype Blah ..." + | DataType -- "data Blah ..." + deriving( Eq ) -- Needed because Demand derives Eq \end{code} Simple classifiers \begin{code} -isIfaceSigDecl, isDataDecl, isSynDecl, isClassDecl :: TyClDecl name pat -> Bool - -isIfaceSigDecl (IfaceSig {}) = True -isIfaceSigDecl other = False +isDataDecl, isSynDecl, isClassDecl :: TyClDecl name -> Bool isSynDecl (TySynonym {}) = True isSynDecl other = False @@ -323,181 +394,90 @@ isClassDecl other = False Dealing with names \begin{code} --------------------------------- -tyClDeclName :: TyClDecl name pat -> name -tyClDeclName tycl_decl = tcdName tycl_decl +tcdName :: TyClDecl name -> name +tcdName decl = unLoc (tcdLName decl) --------------------------------- -tyClDeclNames :: Eq name => TyClDecl name pat -> [(name, SrcLoc)] +tyClDeclNames :: Eq name => TyClDecl name -> [Located name] -- Returns all the *binding* names of the decl, along with their SrcLocs -- The first one is guaranteed to be the name of the decl -- For record fields, the first one counts as the SrcLoc -- We use the equality to filter out duplicate field names -tyClDeclNames (TySynonym {tcdName = name, tcdLoc = loc}) = [(name,loc)] -tyClDeclNames (IfaceSig {tcdName = name, tcdLoc = loc}) = [(name,loc)] -tyClDeclNames (ForeignType {tcdName = name, tcdLoc = loc}) = [(name,loc)] +tyClDeclNames (TySynonym {tcdLName = name}) = [name] +tyClDeclNames (ForeignType {tcdLName = name}) = [name] -tyClDeclNames (ClassDecl {tcdName = cls_name, tcdSigs = sigs, tcdLoc = loc}) - = (cls_name,loc) : [(n,loc) | ClassOpSig n _ _ loc <- sigs] - -tyClDeclNames (TyData {tcdName = tc_name, tcdCons = cons, tcdLoc = loc}) - = (tc_name,loc) : conDeclsNames cons +tyClDeclNames (ClassDecl {tcdLName = cls_name, tcdSigs = sigs}) + = cls_name : [n | L _ (TypeSig n _) <- sigs] +tyClDeclNames (TyData {tcdLName = tc_name, tcdCons = cons}) + = tc_name : conDeclsNames (map unLoc cons) tyClDeclTyVars (TySynonym {tcdTyVars = tvs}) = tvs tyClDeclTyVars (TyData {tcdTyVars = tvs}) = tvs tyClDeclTyVars (ClassDecl {tcdTyVars = tvs}) = tvs tyClDeclTyVars (ForeignType {}) = [] -tyClDeclTyVars (IfaceSig {}) = [] - - --------------------------------- --- The "system names" are extra implicit names *bound* by the decl. --- They are kept in a list rather than a tuple --- to make the renamer easier. - -type ClassSysNames name = [name] --- For class decls they are: --- [tycon, datacon wrapper, datacon worker, --- superclass selector 1, ..., superclass selector n] - -type DataSysNames name = [name] --- For data decls they are --- [from, to] --- where from :: T -> Tring --- to :: Tring -> T - -tyClDeclSysNames :: TyClDecl name pat -> [(name, SrcLoc)] --- Similar to tyClDeclNames, but returns the "implicit" --- or "system" names of the declaration - -tyClDeclSysNames (ClassDecl {tcdSysNames = names, tcdLoc = loc}) - = [(n,loc) | n <- names] -tyClDeclSysNames (TyData {tcdCons = cons, tcdSysNames = names, tcdLoc = loc}) - = [(n,loc) | n <- names] ++ - [(wkr_name,loc) | ConDecl _ wkr_name _ _ _ loc <- cons] -tyClDeclSysNames decl = [] - - -mkClassDeclSysNames :: (name, name, name, [name]) -> [name] -getClassDeclSysNames :: [name] -> (name, name, name, [name]) -mkClassDeclSysNames (a,b,c,ds) = a:b:c:ds -getClassDeclSysNames (a:b:c:ds) = (a,b,c,ds) -\end{code} - -\begin{code} -instance (NamedThing name, Ord name) => Eq (TyClDecl name pat) where - -- Used only when building interface files - (==) d1@(IfaceSig {}) d2@(IfaceSig {}) - = tcdName d1 == tcdName d2 && - tcdType d1 == tcdType d2 && - tcdIdInfo d1 == tcdIdInfo d2 - - (==) d1@(ForeignType {}) d2@(ForeignType {}) - = tcdName d1 == tcdName d2 && - tcdFoType d1 == tcdFoType d2 - - (==) d1@(TyData {}) d2@(TyData {}) - = tcdName d1 == tcdName d2 && - tcdND d1 == tcdND d2 && - eqWithHsTyVars (tcdTyVars d1) (tcdTyVars d2) (\ env -> - eq_hsContext env (tcdCtxt d1) (tcdCtxt d2) && - eqListBy (eq_ConDecl env) (tcdCons d1) (tcdCons d2) - ) - - (==) d1@(TySynonym {}) d2@(TySynonym {}) - = tcdName d1 == tcdName d2 && - eqWithHsTyVars (tcdTyVars d1) (tcdTyVars d2) (\ env -> - eq_hsType env (tcdSynRhs d1) (tcdSynRhs d2) - ) - - (==) d1@(ClassDecl {}) d2@(ClassDecl {}) - = tcdName d1 == tcdName d2 && - eqWithHsTyVars (tcdTyVars d1) (tcdTyVars d2) (\ env -> - eq_hsContext env (tcdCtxt d1) (tcdCtxt d2) && - eqListBy (eq_hsFD env) (tcdFDs d1) (tcdFDs d2) && - eqListBy (eq_cls_sig env) (tcdSigs d1) (tcdSigs d2) - ) - - (==) _ _ = False -- default case - -eq_hsFD env (ns1,ms1) (ns2,ms2) - = eqListBy (eq_hsVar env) ns1 ns2 && eqListBy (eq_hsVar env) ms1 ms2 - -eq_cls_sig env (ClassOpSig n1 dm1 ty1 _) (ClassOpSig n2 dm2 ty2 _) - = n1==n2 && dm1 `eq_dm` dm2 && eq_hsType env ty1 ty2 - where - -- Ignore the name of the default method for (DefMeth id) - -- This is used for comparing declarations before putting - -- them into interface files, and the name of the default - -- method isn't relevant - NoDefMeth `eq_dm` NoDefMeth = True - GenDefMeth `eq_dm` GenDefMeth = True - DefMeth _ `eq_dm` DefMeth _ = True - dm1 `eq_dm` dm2 = False - - \end{code} \begin{code} -countTyClDecls :: [TyClDecl name pat] -> (Int, Int, Int, Int, Int) +countTyClDecls :: [TyClDecl name] -> (Int, Int, Int, Int) -- class, data, newtype, synonym decls countTyClDecls decls - = (length [() | ClassDecl {} <- decls], - length [() | TySynonym {} <- decls], - length [() | IfaceSig {} <- decls], - length [() | TyData {tcdND = DataType} <- decls], - length [() | TyData {tcdND = NewType} <- decls]) + = (count isClassDecl decls, + count isSynDecl decls, + count isDataTy decls, + count isNewTy decls) + where + isDataTy TyData{tcdND=DataType} = True + isDataTy _ = False + + isNewTy TyData{tcdND=NewType} = True + isNewTy _ = False \end{code} \begin{code} -instance (NamedThing name, Outputable name, Outputable pat) - => Outputable (TyClDecl name pat) where +instance OutputableBndr name + => Outputable (TyClDecl name) where - ppr (IfaceSig {tcdName = var, tcdType = ty, tcdIdInfo = info}) - = hsep [ppr var, dcolon, ppr ty, pprHsIdInfo info] + ppr (ForeignType {tcdLName = ltycon}) + = hsep [ptext SLIT("foreign import type dotnet"), ppr ltycon] - ppr (ForeignType {tcdName = tycon}) - = hsep [ptext SLIT("foreign import type dotnet"), ppr tycon] - - ppr (TySynonym {tcdName = tycon, tcdTyVars = tyvars, tcdSynRhs = mono_ty}) - = hang (ptext SLIT("type") <+> pp_decl_head [] tycon tyvars <+> equals) + ppr (TySynonym {tcdLName = ltycon, tcdTyVars = tyvars, tcdSynRhs = mono_ty}) + = hang (ptext SLIT("type") <+> pp_decl_head [] ltycon tyvars <+> equals) 4 (ppr mono_ty) - ppr (TyData {tcdND = new_or_data, tcdCtxt = context, tcdName = tycon, - tcdTyVars = tyvars, tcdCons = condecls, tcdNCons = ncons, + ppr (TyData {tcdND = new_or_data, tcdCtxt = context, tcdLName = ltycon, + tcdTyVars = tyvars, tcdKindSig = mb_sig, tcdCons = condecls, tcdDerivs = derivings}) - = pp_tydecl (ptext keyword <+> pp_decl_head context tycon tyvars) - (pp_condecls condecls ncons) + = pp_tydecl (ppr new_or_data <+> pp_decl_head (unLoc context) ltycon tyvars <+> ppr_sig mb_sig) + (pp_condecls condecls) derivings where - keyword = case new_or_data of - NewType -> SLIT("newtype") - DataType -> SLIT("data") + ppr_sig Nothing = empty + ppr_sig (Just kind) = dcolon <+> pprKind kind - ppr (ClassDecl {tcdCtxt = context, tcdName = clas, tcdTyVars = tyvars, tcdFDs = fds, + ppr (ClassDecl {tcdCtxt = context, tcdLName = lclas, tcdTyVars = tyvars, tcdFDs = fds, tcdSigs = sigs, tcdMeths = methods}) | null sigs -- No "where" part = top_matter | otherwise -- Laid out = sep [hsep [top_matter, ptext SLIT("where {")], - nest 4 (sep [sep (map ppr_sig sigs), pp_methods, char '}'])] + nest 4 (sep [sep (map ppr_sig sigs), ppr methods, char '}'])] where - top_matter = ptext SLIT("class") <+> pp_decl_head context clas tyvars <+> pprFundeps fds + top_matter = ptext SLIT("class") <+> pp_decl_head (unLoc context) lclas tyvars <+> pprFundeps (map unLoc fds) ppr_sig sig = ppr sig <> semi - pp_methods = getPprStyle $ \ sty -> - if ifaceStyle sty || isNothing methods - then empty - else ppr (fromJust methods) - -pp_decl_head :: Outputable name => HsContext name -> name -> [HsTyVarBndr name] -> SDoc -pp_decl_head context thing tyvars = hsep [pprHsContext context, ppr thing, interppSP tyvars] - -pp_condecls [] ncons = ptext SLIT("{- abstract with") <+> int ncons <+> ptext SLIT("constructors -}") -pp_condecls (c:cs) ncons = equals <+> sep (ppr c : map (\ c -> ptext SLIT("|") <+> ppr c) cs) +pp_decl_head :: OutputableBndr name + => HsContext name + -> Located name + -> [LHsTyVarBndr name] + -> SDoc +pp_decl_head context thing tyvars + = hsep [pprHsContext context, ppr thing, interppSP tyvars] +pp_condecls cs@(L _ ConDecl{ con_res = ResTyGADT _ } : _) -- In GADT syntax + = hang (ptext SLIT("where")) 2 (vcat (map ppr cs)) +pp_condecls cs -- In H98 syntax + = equals <+> sep (punctuate (ptext SLIT(" |")) (map ppr cs)) pp_tydecl pp_head pp_decl_rhs derivings = hang pp_head 4 (sep [ @@ -506,6 +486,10 @@ pp_tydecl pp_head pp_decl_rhs derivings Nothing -> empty Just ds -> hsep [ptext SLIT("deriving"), parens (interpp'SP ds)] ]) + +instance Outputable NewOrData where + ppr NewType = ptext SLIT("newtype") + ppr DataType = ptext SLIT("data") \end{code} @@ -516,114 +500,87 @@ pp_tydecl pp_head pp_decl_rhs derivings %************************************************************************ \begin{code} +type LConDecl name = Located (ConDecl name) + +-- data T b = forall a. Eq a => MkT a b +-- MkT :: forall b a. Eq a => MkT a b + +-- data T b where +-- MkT1 :: Int -> T Int + +-- data T = Int `MkT` Int +-- | MkT2 + +-- data T a where +-- Int `MkT` Int :: T Int + data ConDecl name - = ConDecl name -- Constructor name; this is used for the - -- DataCon itself, and for the user-callable wrapper Id + = ConDecl + { con_name :: Located name -- Constructor name; this is used for the + -- DataCon itself, and for the user-callable wrapper Id - name -- Name of the constructor's 'worker Id' - -- Filled in as the ConDecl is built + , con_explicit :: HsExplicitForAll -- Is there an user-written forall? (cf. HStypes.HsForAllTy) - [HsTyVarBndr name] -- Existentially quantified type variables - (HsContext name) -- ...and context - -- If both are empty then there are no existentials + , con_qvars :: [LHsTyVarBndr name] -- ResTyH98: the constructor's existential type variables + -- ResTyGADT: all the constructor's quantified type variables - (ConDetails name) - SrcLoc + , con_cxt :: LHsContext name -- The context. This *does not* include the + -- "stupid theta" which lives only in the TyData decl -data ConDetails name - = VanillaCon -- prefix-style con decl - [BangType name] + , con_details :: HsConDetails name (LBangType name) -- The main payload - | InfixCon -- infix-style con decl - (BangType name) - (BangType name) + , con_res :: ResType name -- Result type of the constructor + } - | RecCon -- record-style con decl - [([name], BangType name)] -- list of "fields" +data ResType name + = ResTyH98 -- Constructor was declared using Haskell 98 syntax + | ResTyGADT (LHsType name) -- Constructor was declared using GADT-style syntax, + -- and here is its result type \end{code} \begin{code} -conDeclsNames :: Eq name => [ConDecl name] -> [(name,SrcLoc)] +conDeclsNames :: Eq name => [ConDecl name] -> [Located name] -- See tyClDeclNames for what this does -- The function is boringly complicated because of the records -- And since we only have equality, we have to be a little careful conDeclsNames cons = snd (foldl do_one ([], []) cons) where - do_one (flds_seen, acc) (ConDecl name _ _ _ details loc) - = do_details ((name,loc):acc) details + do_one (flds_seen, acc) (ConDecl { con_name = lname, con_details = RecCon flds }) + = (map unLoc new_flds ++ flds_seen, lname : [f | f <- new_flds] ++ acc) where - do_details acc (RecCon flds) = foldl do_fld (flds_seen, acc) flds - do_details acc other = (flds_seen, acc) + new_flds = [ f | (f,_) <- flds, not (unLoc f `elem` flds_seen) ] - do_fld acc (flds, _) = foldl do_fld1 acc flds + do_one (flds_seen, acc) c + = (flds_seen, (con_name c):acc) - do_fld1 (flds_seen, acc) fld - | fld `elem` flds_seen = (flds_seen,acc) - | otherwise = (fld:flds_seen, (fld,loc):acc) -\end{code} - -\begin{code} -conDetailsTys :: ConDetails name -> [HsType name] -conDetailsTys (VanillaCon btys) = map getBangType btys -conDetailsTys (InfixCon bty1 bty2) = [getBangType bty1, getBangType bty2] -conDetailsTys (RecCon fields) = [getBangType bty | (_, bty) <- fields] - - -eq_ConDecl env (ConDecl n1 _ tvs1 cxt1 cds1 _) - (ConDecl n2 _ tvs2 cxt2 cds2 _) - = n1 == n2 && - (eq_hsTyVars env tvs1 tvs2 $ \ env -> - eq_hsContext env cxt1 cxt2 && - eq_ConDetails env cds1 cds2) - -eq_ConDetails env (VanillaCon bts1) (VanillaCon bts2) - = eqListBy (eq_btype env) bts1 bts2 -eq_ConDetails env (InfixCon bta1 btb1) (InfixCon bta2 btb2) - = eq_btype env bta1 bta2 && eq_btype env btb1 btb2 -eq_ConDetails env (RecCon fs1) (RecCon fs2) - = eqListBy (eq_fld env) fs1 fs2 -eq_ConDetails env _ _ = False - -eq_fld env (ns1,bt1) (ns2, bt2) = ns1==ns2 && eq_btype env bt1 bt2 +conDetailsTys details = map getBangType (hsConArgs details) \end{code} -\begin{code} -data BangType name = BangType StrictnessMark (HsType name) - -getBangType (BangType _ ty) = ty -getBangStrictness (BangType s _) = s - -unbangedType ty = BangType NotMarkedStrict ty - -eq_btype env (BangType s1 t1) (BangType s2 t2) = s1==s2 && eq_hsType env t1 t2 -\end{code} \begin{code} -instance (Outputable name) => Outputable (ConDecl name) where - ppr (ConDecl con _ tvs cxt con_details loc) - = sep [pprHsForAll tvs cxt, ppr_con_details con con_details] - -ppr_con_details con (InfixCon ty1 ty2) - = hsep [ppr_bang ty1, ppr con, ppr_bang ty2] +instance (OutputableBndr name) => Outputable (ConDecl name) where + ppr = pprConDecl -ppr_con_details con (VanillaCon tys) - = ppr con <+> hsep (map (ppr_bang) tys) +pprConDecl (ConDecl con expl tvs cxt details ResTyH98) + = sep [pprHsForAll expl tvs cxt, ppr_details con details] + where + ppr_details con (InfixCon t1 t2) = hsep [ppr t1, pprHsVar con, ppr t2] + ppr_details con (PrefixCon tys) = hsep (pprHsVar con : map ppr tys) + ppr_details con (RecCon fields) = ppr con <+> ppr_fields fields -ppr_con_details con (RecCon fields) - = ppr con <+> braces (sep (punctuate comma (map ppr_field fields))) +pprConDecl (ConDecl con expl tvs cxt details (ResTyGADT res_ty)) + = sep [pprHsForAll expl tvs cxt, ppr con <+> ppr_details details] where - ppr_field (ns, ty) = hsep (map (ppr) ns) <+> - dcolon <+> - ppr_bang ty + ppr_details (PrefixCon arg_tys) = dcolon <+> ppr (foldr mk_fun_ty res_ty arg_tys) + ppr_details (RecCon fields) = ppr fields <+> dcolon <+> ppr res_ty -instance Outputable name => Outputable (BangType name) where - ppr = ppr_bang + mk_fun_ty a b = noLoc (HsFunTy a b) -ppr_bang (BangType s ty) = ppr s <> pprParendHsType ty +ppr_fields fields = braces (sep (punctuate comma (map ppr_field fields))) +ppr_field (n, ty) = ppr n <+> dcolon <+> ppr ty \end{code} - %************************************************************************ %* * \subsection[InstDecl]{An instance declaration @@ -631,47 +588,23 @@ ppr_bang (BangType s ty) = ppr s <> pprParendHsType ty %************************************************************************ \begin{code} -data InstDecl name pat - = InstDecl (HsType name) -- Context => Class Instance-type +type LInstDecl name = Located (InstDecl name) + +data InstDecl name + = InstDecl (LHsType name) -- Context => Class Instance-type -- Using a polytype means that the renamer conveniently -- figures out the quantified type variables for us. + (LHsBinds name) + [LSig name] -- User-supplied pragmatic info - (MonoBinds name pat) - - [Sig name] -- User-supplied pragmatic info - - (Maybe name) -- Name for the dictionary function - -- Nothing for source-file instance decls - - SrcLoc -\end{code} - -\begin{code} -instance (Outputable name, Outputable pat) - => Outputable (InstDecl name pat) where - - ppr (InstDecl inst_ty binds uprags maybe_dfun_name src_loc) - = getPprStyle $ \ sty -> - if ifaceStyle sty then - hsep [ptext SLIT("instance"), ppr inst_ty, equals, pp_dfun] - else - vcat [hsep [ptext SLIT("instance"), ppr inst_ty, ptext SLIT("where")], - nest 4 (ppr uprags), - nest 4 (ppr binds) ] - where - pp_dfun = case maybe_dfun_name of - Just df -> ppr df - Nothing -> empty -\end{code} +instance (OutputableBndr name) => Outputable (InstDecl name) where -\begin{code} -instance Ord name => Eq (InstDecl name pat) where - -- Used for interface comparison only, so don't compare bindings - (==) (InstDecl inst_ty1 _ _ dfun1 _) (InstDecl inst_ty2 _ _ dfun2 _) - = inst_ty1 == inst_ty2 && dfun1 == dfun2 + ppr (InstDecl inst_ty binds uprags) + = vcat [hsep [ptext SLIT("instance"), ppr inst_ty, ptext SLIT("where")], + nest 4 (ppr uprags), + nest 4 (pprLHsBinds binds) ] \end{code} - %************************************************************************ %* * \subsection[DefaultDecl]{A @default@ declaration} @@ -683,14 +616,15 @@ for the parser to check that; we pass them all through in the abstract syntax, and that restriction must be checked in the front end. \begin{code} +type LDefaultDecl name = Located (DefaultDecl name) + data DefaultDecl name - = DefaultDecl [HsType name] - SrcLoc + = DefaultDecl [LHsType name] -instance (Outputable name) +instance (OutputableBndr name) => Outputable (DefaultDecl name) where - ppr (DefaultDecl tys src_loc) + ppr (DefaultDecl tys) = ptext SLIT("default") <+> parens (interpp'SP tys) \end{code} @@ -701,43 +635,104 @@ instance (Outputable name) %************************************************************************ \begin{code} -data ForeignDecl name - = ForeignImport name (HsType name) FoImport SrcLoc - | ForeignExport name (HsType name) FoExport SrcLoc -forDeclName (ForeignImport n _ _ _) = n -forDeclName (ForeignExport n _ _ _) = n +-- foreign declarations are distinguished as to whether they define or use a +-- Haskell name +-- +-- * the Boolean value indicates whether the pre-standard deprecated syntax +-- has been used +-- +type LForeignDecl name = Located (ForeignDecl name) + +data ForeignDecl name + = ForeignImport (Located name) (LHsType name) ForeignImport Bool -- defines name + | ForeignExport (Located name) (LHsType name) ForeignExport Bool -- uses name -data FoImport - = LblImport CLabelString -- foreign label - | CImport CCallSpec -- foreign import - | CDynImport CCallConv -- foreign export dynamic - | DNImport DNCallSpec -- foreign import dotnet +-- specification of an imported external entity in dependence on the calling +-- convention +-- +data ForeignImport = -- import of a C entity + -- + -- * the two strings specifying a header file or library + -- may be empty, which indicates the absence of a + -- header or object specification (both are not used + -- in the case of `CWrapper' and when `CFunction' + -- has a dynamic target) + -- + -- * the calling convention is irrelevant for code + -- generation in the case of `CLabel', but is needed + -- for pretty printing + -- + -- * `Safety' is irrelevant for `CLabel' and `CWrapper' + -- + CImport CCallConv -- ccall or stdcall + Safety -- safe or unsafe + FastString -- name of C header + FastString -- name of library object + CImportSpec -- details of the C entity + + -- import of a .NET function + -- + | DNImport DNCallSpec + +-- details of an external C entity +-- +data CImportSpec = CLabel CLabelString -- import address of a C label + | CFunction CCallTarget -- static or dynamic function + | CWrapper -- wrapper to expose closures + -- (former f.e.d.) -data FoExport = CExport CExportSpec +-- specification of an externally exported entity in dependence on the calling +-- convention +-- +data ForeignExport = CExport CExportSpec -- contains the calling convention + | DNExport -- presently unused +-- abstract type imported from .NET +-- data FoType = DNType -- In due course we'll add subtype stuff - deriving( Eq ) -- Used for equality instance for TyClDecl + deriving (Eq) -- Used for equality instance for TyClDecl -instance Outputable name => Outputable (ForeignDecl name) where - ppr (ForeignImport nm ty (LblImport lbl) src_loc) - = ptext SLIT("foreign label") <+> ppr lbl <+> ppr nm <+> dcolon <+> ppr ty - ppr (ForeignImport nm ty decl src_loc) - = ptext SLIT("foreign import") <+> ppr decl <+> ppr nm <+> dcolon <+> ppr ty - ppr (ForeignExport nm ty decl src_loc) - = ptext SLIT("foreign export") <+> ppr decl <+> ppr nm <+> dcolon <+> ppr ty -instance Outputable FoImport where - ppr (CImport d) = ppr d - ppr (CDynImport conv) = text "dynamic" <+> ppr conv - ppr (DNImport d) = ptext SLIT("dotnet") <+> ppr d - ppr (LblImport l) = ptext SLIT("label") <+> ppr l +-- pretty printing of foreign declarations +-- -instance Outputable FoExport where - ppr (CExport d) = ppr d +instance OutputableBndr name => Outputable (ForeignDecl name) where + ppr (ForeignImport n ty fimport _) = + ptext SLIT("foreign import") <+> ppr fimport <+> + ppr n <+> dcolon <+> ppr ty + ppr (ForeignExport n ty fexport _) = + ptext SLIT("foreign export") <+> ppr fexport <+> + ppr n <+> dcolon <+> ppr ty + +instance Outputable ForeignImport where + ppr (DNImport spec) = + ptext SLIT("dotnet") <+> ppr spec + ppr (CImport cconv safety header lib spec) = + ppr cconv <+> ppr safety <+> + char '"' <> pprCEntity header lib spec <> char '"' + where + pprCEntity header lib (CLabel lbl) = + ptext SLIT("static") <+> ftext header <+> char '&' <> + pprLib lib <> ppr lbl + pprCEntity header lib (CFunction (StaticTarget lbl)) = + ptext SLIT("static") <+> ftext header <+> char '&' <> + pprLib lib <> ppr lbl + pprCEntity header lib (CFunction (DynamicTarget)) = + ptext SLIT("dynamic") + pprCEntity _ _ (CWrapper) = ptext SLIT("wrapper") + -- + pprLib lib | nullFS lib = empty + | otherwise = char '[' <> ppr lib <> char ']' + +instance Outputable ForeignExport where + ppr (CExport (CExportStatic lbl cconv)) = + ppr cconv <+> char '"' <> ppr lbl <> char '"' + ppr (DNExport ) = + ptext SLIT("dotnet") <+> ptext SLIT("\"\"") instance Outputable FoType where - ppr DNType = ptext SLIT("type dotnet") + ppr DNType = ptext SLIT("type dotnet") \end{code} @@ -748,69 +743,35 @@ instance Outputable FoType where %************************************************************************ \begin{code} -data RuleDecl name pat +type LRuleDecl name = Located (RuleDecl name) + +data RuleDecl name = HsRule -- Source rule - FAST_STRING -- Rule name - [name] -- Forall'd tyvars, filled in by the renamer with - -- tyvars mentioned in sigs; then filled out by typechecker - [RuleBndr name] -- Forall'd term vars - (HsExpr name pat) -- LHS - (HsExpr name pat) -- RHS - SrcLoc - - | IfaceRule -- One that's come in from an interface file; pre-typecheck - FAST_STRING - [UfBinder name] -- Tyvars and term vars - name -- Head of lhs - [UfExpr name] -- Args of LHS - (UfExpr name) -- Pre typecheck - SrcLoc - - | IfaceRuleOut -- Post typecheck - name -- Head of LHS - CoreRule - -isIfaceRuleDecl (HsRule _ _ _ _ _ _) = False -isIfaceRuleDecl other = True - -ifaceRuleDeclName :: RuleDecl name pat -> name -ifaceRuleDeclName (IfaceRule _ _ n _ _ _) = n -ifaceRuleDeclName (IfaceRuleOut n r) = n -ifaceRuleDeclName (HsRule fs _ _ _ _ _) = pprPanic "ifaceRuleDeclName" (ppr fs) + RuleName -- Rule name + Activation + [RuleBndr name] -- Forall'd vars; after typechecking this includes tyvars + (Located (HsExpr name)) -- LHS + NameSet -- Free-vars from the LHS + (Located (HsExpr name)) -- RHS + NameSet -- Free-vars from the RHS data RuleBndr name - = RuleBndr name - | RuleBndrSig name (HsType name) - -instance (NamedThing name, Ord name) => Eq (RuleDecl name pat) where - -- Works for IfaceRules only; used when comparing interface file versions - (IfaceRule n1 bs1 f1 es1 rhs1 _) == (IfaceRule n2 bs2 f2 es2 rhs2 _) - = n1==n2 && f1 == f2 && - eq_ufBinders emptyEqHsEnv bs1 bs2 (\env -> - eqListBy (eq_ufExpr env) (rhs1:es1) (rhs2:es2)) - -instance (NamedThing name, Outputable name, Outputable pat) - => Outputable (RuleDecl name pat) where - ppr (HsRule name tvs ns lhs rhs loc) - = sep [text "{-# RULES" <+> doubleQuotes (ptext name), - pp_forall, ppr lhs, equals <+> ppr rhs, - text "#-}" ] - where - pp_forall | null tvs && null ns = empty - | otherwise = text "forall" <+> - fsep (map ppr tvs ++ map ppr ns) - <> dot + = RuleBndr (Located name) + | RuleBndrSig (Located name) (LHsType name) - ppr (IfaceRule name tpl_vars fn tpl_args rhs loc) - = hsep [ doubleQuotes (ptext name), - ptext SLIT("__forall") <+> braces (interppSP tpl_vars), - ppr fn <+> sep (map (pprUfExpr parens) tpl_args), - ptext SLIT("=") <+> ppr rhs - ] <+> semi +collectRuleBndrSigTys :: [RuleBndr name] -> [LHsType name] +collectRuleBndrSigTys bndrs = [ty | RuleBndrSig _ ty <- bndrs] - ppr (IfaceRuleOut fn rule) = pprCoreRule (ppr fn) rule +instance OutputableBndr name => Outputable (RuleDecl name) where + ppr (HsRule name act ns lhs fv_lhs rhs fv_rhs) + = sep [text "{-# RULES" <+> doubleQuotes (ftext name) <+> ppr act, + nest 4 (pp_forall <+> pprExpr (unLoc lhs)), + nest 4 (equals <+> pprExpr (unLoc rhs) <+> text "#-}") ] + where + pp_forall | null ns = empty + | otherwise = text "forall" <+> fsep (map ppr ns) <> dot -instance Outputable name => Outputable (RuleBndr name) where +instance OutputableBndr name => Outputable (RuleBndr name) where ppr (RuleBndr name) = ppr name ppr (RuleBndrSig name ty) = ppr name <> dcolon <> ppr ty \end{code} @@ -825,11 +786,11 @@ instance Outputable name => Outputable (RuleBndr name) where We use exported entities for things to deprecate. \begin{code} -data DeprecDecl name = Deprecation name DeprecTxt SrcLoc +type LDeprecDecl name = Located (DeprecDecl name) -type DeprecTxt = FAST_STRING -- reason/explanation for deprecation +data DeprecDecl name = Deprecation name DeprecTxt -instance Outputable name => Outputable (DeprecDecl name) where - ppr (Deprecation thing txt _) +instance OutputableBndr name => Outputable (DeprecDecl name) where + ppr (Deprecation thing txt) = hsep [text "{-# DEPRECATED", ppr thing, doubleQuotes (ppr txt), text "#-}"] \end{code}