X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2FhsSyn%2FHsDecls.lhs;h=375a35d4434092aa7111edae9946387d2e78ab44;hb=6858f7c15fcf9efe9e6fdf22de34d0791b0f0c08;hp=68b1a878c92df99dd7f1ebc4e778a6d82ad2bca5;hpb=2f51f1402e6869c0f049ffbe7b019bf6ab80558f;p=ghc-hetmet.git diff --git a/ghc/compiler/hsSyn/HsDecls.lhs b/ghc/compiler/hsSyn/HsDecls.lhs index 68b1a87..375a35d 100644 --- a/ghc/compiler/hsSyn/HsDecls.lhs +++ b/ghc/compiler/hsSyn/HsDecls.lhs @@ -1,146 +1,518 @@ % -% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996 +% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998 % \section[HsDecls]{Abstract syntax: global declarations} -Definitions for: @FixityDecl@, @TyDecl@ and @ConDecl@, @ClassDecl@, -@InstDecl@, @DefaultDecl@. +Definitions for: @TyDecl@ and @oCnDecl@, @ClassDecl@, +@InstDecl@, @DefaultDecl@ and @ForeignDecl@. \begin{code} -#include "HsVersions.h" - -module HsDecls where +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 + ) where -import Ubiq +#include "HsVersions.h" -- friends: -import HsLoop ( nullMonoBinds, MonoBinds, Sig ) -import HsPragmas ( DataPragmas, ClassPragmas, - InstancePragmas, ClassOpPragmas ) +import HsBinds ( HsBinds, MonoBinds, Sig(..), FixitySig(..) ) +import HsExpr ( HsExpr ) +import HsImpExp ( ppr_var ) import HsTypes +import PprCore ( pprCoreRule ) +import HsCore ( UfExpr, UfBinder, HsIdInfo, pprHsIdInfo, + eq_ufBinders, eq_ufExpr, pprUfExpr + ) +import CoreSyn ( CoreRule(..), RuleName ) +import BasicTypes ( NewOrData(..), StrictnessMark(..), Activation(..) ) +import ForeignCall ( CExportSpec, CCallSpec, DNCallSpec, CCallConv ) -- others: -import Name ( pprSym, pprNonSym ) -import Outputable ( interppSP, interpp'SP, - Outputable(..){-instance * []-} - ) -import Pretty +import Name ( NamedThing ) +import FunDeps ( pprFundeps ) +import Class ( FunDep, DefMeth(..) ) +import CStrings ( CLabelString ) +import Outputable +import Util ( eqListBy ) import SrcLoc ( SrcLoc ) -import Util ( cmpList, panic#{-ToDo:rm eventually-} ) +import FastString + +import Maybe ( isNothing, fromJust ) \end{code} + %************************************************************************ %* * -\subsection[FixityDecl]{A fixity declaration} +\subsection[HsDecl]{Declarations} %* * %************************************************************************ \begin{code} -data FixityDecl name - = InfixL name Int - | InfixR name Int - | InfixN name Int +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) + +-- NB: all top-level fixity decls are contained EITHER +-- EITHER FixDs +-- OR in the ClassDecls in TyClDs +-- +-- The former covers +-- a) data constructors +-- b) class methods (but they can be also done in the +-- signatures of class decls) +-- c) imported functions (that have an IfacSig) +-- 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 + \end{code} \begin{code} -instance (NamedThing name, Outputable name) - => Outputable (FixityDecl name) where - ppr sty (InfixL var prec) = print_it sty "l" prec var - ppr sty (InfixR var prec) = print_it sty "r" prec var - ppr sty (InfixN var prec) = print_it sty "" prec var - -print_it sty suff prec var - = ppBesides [ppStr "infix", ppStr suff, ppSP, ppInt prec, ppSP, pprSym sty var] +instance (NamedThing name, Outputable name, Outputable pat) + => Outputable (HsDecl name pat) 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 (RuleD rd) = ppr rd + ppr (DeprecD dd) = ppr dd \end{code} + %************************************************************************ %* * \subsection[TyDecl]{@data@, @newtype@ or @type@ (synonym) type declaration} %* * %************************************************************************ -\begin{code} -data TyDecl name - = TyData (Context name) -- context - name -- type constructor - [name] -- type variables - [ConDecl name] -- data constructors (empty if abstract) - (Maybe [name]) -- derivings; Nothing => not specified - -- (i.e., derive default); Just [] => derive - -- *nothing*; Just => as you would - -- expect... - (DataPragmas name) - SrcLoc - - | TyNew (Context name) -- context - name -- type constructor - [name] -- type variables - [ConDecl name] -- data constructor (empty if abstract) - (Maybe [name]) -- derivings; as above - (DataPragmas name) - SrcLoc + -------------------------------- + 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! + +"Implicit" (or "system") binders +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + Each data type decl defines + a worker name for each constructor + to-T and from-T convertors + Each class decl defines + a tycon for the class + a data constructor for that tycon + the worker for that constructor + a selector for each superclass + +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 +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) + + - When renaming the decl look them up in the name cache, + ensure correct module and provenance is set + +Default methods +~~~~~~~~~~~~~~~ + - Occurrence name is derived uniquely from the method name + E.g. $dmmax + + - If there is a default method name at all, it's recorded in + the ClassOpSig (in HsBinds), in the DefMeth field. + (DefMeth is defined in Class.lhs) + +Source-code class decls and interface-code class decls are treated subtly +differently, which has given me a great deal of confusion over the years. +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 + + - The renamer renames it to a Name + + - During typechecking, we generate a binding for each $dm for + which there's a programmer-supplied default method: + class Foo a where + op1 :: + op2 :: + op1 = ... + We generate a binding for $dmop1 but not for $dmop2. + The Class for Foo has a NoDefMeth for op2 and a DefMeth for op1. + The Name for $dmop2 is simply discarded. + +In *interface-file* class declarations: + - When parsing, we see if there's an explicit programmer-supplied default method + because there's an '=' sign to indicate it: + class Foo a where + op1 = :: -- NB the '=' + op2 :: + We use this info to generate a DefMeth with a suitable RdrName for op1, + and a NoDefMeth for op2 + - The interface file has a separate definition for $dmop1, with unfolding etc. + - The renamer renames it to a Name. + - The renamer treats $dmop1 as a free variable of the declaration, so that + the binding for $dmop1 will be sucked in. (See RnHsSyn.tyClDeclFVs) + This doesn't happen for source code class decls, because they *bind* the default method. + +Dictionary functions +~~~~~~~~~~~~~~~~~~~~ +Each instance declaration gives rise to one dictionary function binding. + +The type checker makes up new source-code instance declarations +(e.g. from 'deriving' or generic default methods --- see +TcInstDcls.tcInstDecls1). So we can't generate the names for +dictionary functions in advance (we don't know how many we need). + +On the other hand for interface-file instance declarations, the decl +specifies the name of the dictionary function, and it has a binding elsewhere +in the interface file: + instance {Eq Int} = dEqInt + dEqInt :: {Eq Int} + +So again we treat source code and interface file code slightly differently. + +Source code: + - Source code instance decls have a Nothing in the (Maybe name) field + (see data InstDecl below) + + - The typechecker makes up a Local name for the dict fun for any source-code + instance decl, whether it comes from a source-code instance decl, or whether + the instance decl is derived from some other construct (e.g. 'deriving'). + + - The occurrence name it chooses is derived from the instance decl (just for + documentation really) --- e.g. dNumInt. Two dict funs may share a common + occurrence name, but will have different uniques. E.g. + instance Foo [Int] where ... + instance Foo [Bool] where ... + These might both be dFooList + + - The CoreTidy phase globalises 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) + because dict fun Ids are not captured in a TyCon or Class (unlike default + methods, say). Instead, they are kept separately in the InstEnv. This + makes it easy to adjust them after compiling a module. (Once we've finished + compiling that module, they don't change any more.) + + +Interface file code: + - The instance decl gives the dict fun name, so the InstDecl has a (Just name) + in the (Maybe name) field. + + - RnHsSyn.instDeclFVs treats the dict fun name as free in the decl, so that we + suck in the dfun binding - | TySynonym name -- type constructor - [name] -- type variables - (MonoType name) -- synonym expansion - SrcLoc +\begin{code} +-- TyClDecls are precisely the kind of declarations that can +-- appear in interface files; or (internally) in GHC's interface +-- 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 + } + + | ForeignType { tcdName :: name, -- See remarks about IfaceSig above + tcdExtName :: Maybe FastString, + tcdFoType :: FoType, + tcdLoc :: SrcLoc } + + | 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 + } + + | TySynonym { tcdName :: name, -- type constructor + tcdTyVars :: [HsTyVarBndr name], -- type variables + tcdSynRhs :: HsType name, -- synonym expansion + tcdLoc :: SrcLoc + } + + | 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 + } \end{code} +Simple classifiers + \begin{code} -instance (NamedThing name, Outputable name) - => Outputable (TyDecl name) where +isIfaceSigDecl, isDataDecl, isSynDecl, isClassDecl :: TyClDecl name pat -> Bool - ppr sty (TySynonym tycon tyvars mono_ty src_loc) - = ppHang (pp_decl_head sty SLIT("type") ppNil tycon tyvars) - 4 (ppCat [ppEquals, ppr sty mono_ty]) +isIfaceSigDecl (IfaceSig {}) = True +isIfaceSigDecl other = False - ppr sty (TyData context tycon tyvars condecls derivings pragmas src_loc) - = pp_tydecl sty - (pp_decl_head sty SLIT("data") (pprContext sty context) tycon tyvars) - (pp_condecls sty condecls) - derivings +isSynDecl (TySynonym {}) = True +isSynDecl other = False - ppr sty (TyNew context tycon tyvars condecl derivings pragmas src_loc) - = pp_tydecl sty - (pp_decl_head sty SLIT("newtype") (pprContext sty context) tycon tyvars) - (pp_condecls sty condecl) - derivings +isDataDecl (TyData {}) = True +isDataDecl other = False -pp_decl_head sty str pp_context tycon tyvars - = ppCat [ppPStr str, pp_context, ppr sty tycon, interppSP sty tyvars] +isClassDecl (ClassDecl {}) = True +isClassDecl other = False +\end{code} -pp_condecls sty [] = ppNil -- abstract datatype -pp_condecls sty (c:cs) - = ppSep (ppBeside (ppStr "= ") (ppr sty c) - : map (\ x -> ppBeside (ppStr "| ") (ppr sty x)) cs) +Dealing with names -pp_tydecl sty pp_head pp_decl_rhs derivings - = ppHang pp_head 4 (ppSep [ - pp_decl_rhs, - case derivings of - Nothing -> ppNil - Just ds -> ppBeside (ppPStr SLIT("deriving ")) - (ppParens (ppInterleave ppComma (map (ppr sty) ds)))]) +\begin{code} +-------------------------------- +tyClDeclName :: TyClDecl name pat -> name +tyClDeclName tycl_decl = tcdName tycl_decl + +-------------------------------- +tyClDeclNames :: Eq name => TyClDecl name pat -> [(name, SrcLoc)] +-- 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 (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 + + +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} -A type for recording what types a datatype should be specialised to. -It's called a ``Sig'' because it's sort of like a ``type signature'' -for an datatype declaration. - \begin{code} -data SpecDataSig name - = SpecDataSig name -- tycon to specialise - (MonoType name) - SrcLoc +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} -instance (NamedThing name, Outputable name) - => Outputable (SpecDataSig name) where +\begin{code} +countTyClDecls :: [TyClDecl name pat] -> (Int, 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]) +\end{code} - ppr sty (SpecDataSig tycon ty _) - = ppCat [ppStr "{-# SPECIALIZE data", ppr sty ty, ppStr "#-}"] +\begin{code} +instance (NamedThing name, Outputable name, Outputable pat) + => Outputable (TyClDecl name pat) where + + ppr (IfaceSig {tcdName = var, tcdType = ty, tcdIdInfo = info}) + = getPprStyle $ \ sty -> + hsep [ if ifaceStyle sty then ppr var else ppr_var var, + dcolon, ppr ty, pprHsIdInfo info + ] + + 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) + 4 (ppr mono_ty) + + ppr (TyData {tcdND = new_or_data, tcdCtxt = context, tcdName = tycon, + tcdTyVars = tyvars, tcdCons = condecls, tcdNCons = ncons, + tcdDerivs = derivings}) + = pp_tydecl (ptext keyword <+> pp_decl_head context tycon tyvars) + (pp_condecls condecls ncons) + derivings + where + keyword = case new_or_data of + NewType -> SLIT("newtype") + DataType -> SLIT("data") + + ppr (ClassDecl {tcdCtxt = context, tcdName = clas, 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 '}'])] + where + top_matter = ptext SLIT("class") <+> pp_decl_head context clas tyvars <+> pprFundeps 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_tydecl pp_head pp_decl_rhs derivings + = hang pp_head 4 (sep [ + pp_decl_rhs, + case derivings of + Nothing -> empty + Just ds -> hsep [ptext SLIT("deriving"), parens (interpp'SP ds)] + ]) \end{code} + %************************************************************************ %* * \subsection[ConDecl]{A data-constructor declaration} @@ -149,151 +521,167 @@ instance (NamedThing name, Outputable name) \begin{code} data ConDecl name - = ConDecl name -- prefix-style con decl - [BangType name] - SrcLoc + = ConDecl name -- Constructor name; this is used for the + -- DataCon itself, and for the user-callable wrapper Id - | ConOpDecl (BangType name) -- infix-style con decl - name - (BangType name) - SrcLoc + name -- Name of the constructor's 'worker Id' + -- Filled in as the ConDecl is built - | RecConDecl name - [([name], BangType name)] -- list of "fields" - SrcLoc + [HsTyVarBndr name] -- Existentially quantified type variables + (HsContext name) -- ...and context + -- If both are empty then there are no existentials - | NewConDecl name -- newtype con decl - (MonoType name) + (ConDetails name) SrcLoc -data BangType name - = Banged (MonoType name) - | Unbanged (MonoType name) +data ConDetails name + = VanillaCon -- prefix-style con decl + [BangType name] + + | InfixCon -- infix-style con decl + (BangType name) + (BangType name) + + | RecCon -- record-style con decl + [([name], BangType name)] -- list of "fields" \end{code} \begin{code} -instance (NamedThing name, Outputable name) => Outputable (ConDecl name) where - - ppr sty (ConDecl con tys _) - = ppCat [pprNonSym sty con, ppInterleave ppNil (map (ppr_bang sty) tys)] - ppr sty (ConOpDecl ty1 op ty2 _) - = ppCat [ppr_bang sty ty1, pprSym sty op, ppr_bang sty ty2] - ppr sty (NewConDecl con ty _) - = ppCat [pprNonSym sty con, pprParendMonoType sty ty] - ppr sty (RecConDecl con fields _) - = ppCat [pprNonSym sty con, ppChar '{', - ppInterleave pp'SP (map pp_field fields), ppChar '}'] - where - pp_field (n, ty) = ppCat [ppr sty n, ppPStr SLIT("::"), ppr_bang sty ty] +conDeclsNames :: Eq name => [ConDecl name] -> [(name,SrcLoc)] + -- 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 + where + do_details acc (RecCon flds) = foldl do_fld (flds_seen, acc) flds + do_details acc other = (flds_seen, acc) + + do_fld acc (flds, _) = foldl do_fld1 acc flds + + do_fld1 (flds_seen, acc) fld + | fld `elem` flds_seen = (flds_seen,acc) + | otherwise = (fld:flds_seen, (fld,loc):acc) +\end{code} -ppr_bang sty (Banged ty) = ppBeside (ppChar '!') (pprParendMonoType sty ty) -ppr_bang sty (Unbanged ty) = pprParendMonoType sty ty +\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 \end{code} + +\begin{code} +data BangType name = BangType StrictnessMark (HsType name) -%************************************************************************ -%* * -\subsection[ClassDecl]{A class declaration} -%* * -%************************************************************************ +getBangType (BangType _ ty) = ty +getBangStrictness (BangType s _) = s -\begin{code} -data ClassDecl tyvar uvar name pat - = ClassDecl (Context name) -- context... - name -- name of the class - name -- the class type variable - [Sig name] -- methods' signatures - (MonoBinds tyvar uvar name pat) -- default methods - (ClassPragmas name) - SrcLoc +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 (NamedThing name, Outputable name, Outputable pat, - Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar) - => Outputable (ClassDecl tyvar uvar name pat) where - - ppr sty (ClassDecl context clas tyvar sigs methods pragmas src_loc) - = let - top_matter = ppCat [ppStr "class", pprContext sty context, - ppr sty clas, ppr sty tyvar] - in - if null sigs && nullMonoBinds methods then - ppAbove top_matter (ppNest 4 (ppr sty pragmas)) - else - ppAboves [ppCat [top_matter, ppStr "where"], - ppNest 4 (ppAboves (map (ppr sty) sigs)), - ppNest 4 (ppr sty methods), - ppNest 4 (ppr sty pragmas) ] +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] + +-- ConDecls generated by MkIface.ifaceTyCls always have a VanillaCon, even +-- if the constructor is an infix one. This is because in an interface file +-- we don't distinguish between the two. Hence when printing these for the +-- user, we need to parenthesise infix constructor names. +ppr_con_details con (VanillaCon tys) + = getPprStyle $ \ sty -> + hsep ((if ifaceStyle sty then ppr con else ppr_var con) + : map (ppr_bang) tys) + +ppr_con_details con (RecCon fields) + = ppr con <+> braces (sep (punctuate comma (map ppr_field fields))) + where + ppr_field (ns, ty) = hsep (map (ppr) ns) <+> + dcolon <+> + ppr_bang ty + +instance Outputable name => Outputable (BangType name) where + ppr = ppr_bang + +ppr_bang (BangType s ty) = ppr s <> pprParendHsType ty \end{code} + %************************************************************************ %* * -\subsection[InstDecl]{An instance declaration (also, @SpecInstSig@)} +\subsection[InstDecl]{An instance declaration %* * %************************************************************************ \begin{code} -data InstDecl tyvar uvar name pat - = InstDecl name -- Class - - (PolyType name) -- Context => Instance-type +data InstDecl name pat + = InstDecl (HsType name) -- Context => Class Instance-type -- Using a polytype means that the renamer conveniently -- figures out the quantified type variables for us. - (MonoBinds tyvar uvar name pat) + (MonoBinds name pat) - Bool -- True <=> This instance decl is from the - -- module being compiled; False <=> It is from - -- an imported interface. + [Sig name] -- User-supplied pragmatic info - (Maybe Module) -- The name of the module where the instance decl - -- originally came from; Nothing => Prelude + (Maybe name) -- Name for the dictionary function + -- Nothing for source-file instance decls - [Sig name] -- actually user-supplied pragmatic info - (InstancePragmas name) -- interface-supplied pragmatic info SrcLoc \end{code} \begin{code} -instance (NamedThing name, Outputable name, Outputable pat, - Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar) - => Outputable (InstDecl tyvar uvar name pat) where - - ppr sty (InstDecl clas ty binds local modname uprags pragmas src_loc) - = let - (context, inst_ty) - = case ty of - HsPreForAllTy c t -> (c, t) - HsForAllTy _ c t -> (c, t) - - top_matter = ppCat [ppStr "instance", pprContext sty context, - ppr sty clas, pprParendMonoType sty inst_ty] - in - if nullMonoBinds binds && null uprags then - ppAbove top_matter (ppNest 4 (ppr sty pragmas)) +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 - ppAboves [ppCat [top_matter, ppStr "where"], - if null uprags then ppNil else ppNest 4 (ppr sty uprags), - ppNest 4 (ppr sty binds), - ppNest 4 (ppr sty pragmas) ] + 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} -A type for recording what instances the user wants to specialise; -called a ``Sig'' because it's sort of like a ``type signature'' for an -instance. \begin{code} -data SpecInstSig name - = SpecInstSig name -- class - (MonoType name) -- type to specialise to - SrcLoc - -instance (NamedThing name, Outputable name) - => Outputable (SpecInstSig name) where - - ppr sty (SpecInstSig clas ty _) - = ppCat [ppStr "{-# SPECIALIZE instance", ppr sty clas, ppr sty ty, ppStr "#-}"] +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 \end{code} + %************************************************************************ %* * \subsection[DefaultDecl]{A @default@ declaration} @@ -306,12 +694,155 @@ syntax, and that restriction must be checked in the front end. \begin{code} data DefaultDecl name - = DefaultDecl [MonoType name] + = DefaultDecl [HsType name] SrcLoc -instance (NamedThing name, Outputable name) +instance (Outputable name) => Outputable (DefaultDecl name) where - ppr sty (DefaultDecl tys src_loc) - = ppBeside (ppPStr SLIT("default ")) (ppParens (interpp'SP sty tys)) + ppr (DefaultDecl tys src_loc) + = ptext SLIT("default") <+> parens (interpp'SP tys) +\end{code} + +%************************************************************************ +%* * +\subsection{Foreign function interface declaration} +%* * +%************************************************************************ + +\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 + +data FoImport + = LblImport CLabelString -- foreign label + | CImport CCallSpec -- foreign import + | CDynImport CCallConv -- foreign export dynamic + | DNImport DNCallSpec -- foreign import dotnet + +data FoExport = CExport CExportSpec + +data FoType = DNType -- In due course we'll add subtype stuff + 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 + +instance Outputable FoExport where + ppr (CExport d) = ppr d + +instance Outputable FoType where + ppr DNType = ptext SLIT("type dotnet") +\end{code} + + +%************************************************************************ +%* * +\subsection{Transformation rules} +%* * +%************************************************************************ + +\begin{code} +data RuleDecl name pat + = HsRule -- Source rule + RuleName -- Rule name + Activation + [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 + RuleName + Activation + [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 :: RuleDecl name pat -> Bool +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) + +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 a1 bs1 f1 es1 rhs1 _) == (IfaceRule n2 a2 bs2 f2 es2 rhs2 _) + = n1==n2 && f1 == f2 && a1==a2 && + 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 act tvs ns lhs rhs loc) + = sep [text "{-# RULES" <+> doubleQuotes (ptext name) <+> ppr act, + 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 + + ppr (IfaceRule name act tpl_vars fn tpl_args rhs loc) + = hsep [ doubleQuotes (ptext name), ppr act, + ptext SLIT("__forall") <+> braces (interppSP tpl_vars), + ppr fn <+> sep (map (pprUfExpr parens) tpl_args), + ptext SLIT("=") <+> ppr rhs + ] <+> semi + + ppr (IfaceRuleOut fn rule) = pprCoreRule (ppr fn) rule + +instance Outputable name => Outputable (RuleBndr name) where + ppr (RuleBndr name) = ppr name + ppr (RuleBndrSig name ty) = ppr name <> dcolon <> ppr ty +\end{code} + + +%************************************************************************ +%* * +\subsection[DeprecDecl]{Deprecations} +%* * +%************************************************************************ + +We use exported entities for things to deprecate. + +\begin{code} +data DeprecDecl name = Deprecation name DeprecTxt SrcLoc + +type DeprecTxt = FAST_STRING -- reason/explanation for deprecation + +instance Outputable name => Outputable (DeprecDecl name) where + ppr (Deprecation thing txt _) + = hsep [text "{-# DEPRECATED", ppr thing, doubleQuotes (ppr txt), text "#-}"] \end{code}