X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Ftypecheck%2FTcRnTypes.lhs;h=33190e798768fc0c01be73acdc82ae3135a8ef79;hb=ff818166a0a06e77becad9e28ed116f3b7f5cc8b;hp=01dbce13409b4be3fc1fc637077c653d2a16c2f9;hpb=98688c6e8fd33f31c51218cf93cbf03fe3a5e73d;p=ghc-hetmet.git diff --git a/ghc/compiler/typecheck/TcRnTypes.lhs b/ghc/compiler/typecheck/TcRnTypes.lhs index 01dbce1..33190e7 100644 --- a/ghc/compiler/typecheck/TcRnTypes.lhs +++ b/ghc/compiler/typecheck/TcRnTypes.lhs @@ -9,10 +9,10 @@ module TcRnTypes( -- The environment types Env(..), TcGblEnv(..), TcLclEnv(..), - IfGblEnv(..), IfLclEnv(..), + IfGblEnv(..), IfLclEnv(..), -- Ranamer types - EntityUsage, emptyUsages, ErrCtxt, + ErrCtxt, ImportAvails(..), emptyImportAvails, plusImportAvails, plusAvail, pruneAvails, AvailEnv, emptyAvailEnv, unitAvailEnv, plusAvailEnv, @@ -20,7 +20,7 @@ module TcRnTypes( WhereFrom(..), mkModDeps, -- Typechecker types - TcTyThing(..), + TcTyThing(..), pprTcTyThingCategory, GadtRefinement, -- Template Haskell ThStage(..), topStage, topSpliceStage, @@ -30,38 +30,38 @@ module TcRnTypes( ArrowCtxt(..), topArrowCtxt, ProcLevel, topProcLevel, -- Insts - Inst(..), InstOrigin(..), InstLoc(..), pprInstLoc, instLocSrcLoc, + Inst(..), InstOrigin(..), InstLoc(..), pprInstLoc, + instLocSrcLoc, instLocSrcSpan, LIE, emptyLIE, unitLIE, plusLIE, consLIE, plusLIEs, mkLIE, isEmptyLIE, lieToList, listToLIE, -- Misc other types - TcId, TcIdSet + TcId, TcIdSet, TcDictBinds ) where #include "HsVersions.h" -import HsSyn ( PendingSplice, HsOverLit, MonoBinds, RuleDecl, ForeignDecl ) -import RnHsSyn ( RenamedPat, RenamedArithSeqInfo ) +import HsSyn ( PendingSplice, HsOverLit, LRuleDecl, LForeignDecl, + ArithSeqInfo, DictBinds, LHsBinds ) import HscTypes ( FixityEnv, HscEnv, TypeEnv, TyThing, - Avails, GenAvailInfo(..), AvailInfo, + GenAvailInfo(..), AvailInfo, HscSource(..), availName, IsBootInterface, Deprecations ) -import Packages ( PackageName ) -import TcType ( TcTyVarSet, TcType, TcTauType, TcThetaType, - TcPredType, TcKind, tcCmpPred, tcCmpType, tcCmpTypes ) +import Packages ( PackageId ) +import Type ( Type, TvSubstEnv, pprParendType, pprTyThingCategory ) +import TcType ( TcTyVarSet, TcType, TcTauType, TcThetaType, SkolemInfo, + TcPredType, TcKind, tcCmpPred, tcCmpType, tcCmpTypes, pprSkolInfo ) import InstEnv ( DFunId, InstEnv ) import IOEnv import RdrName ( GlobalRdrEnv, LocalRdrEnv ) import Name ( Name ) import NameEnv -import NameSet ( NameSet, emptyNameSet, DefUses ) +import NameSet ( NameSet, unionNameSets, DefUses ) import OccName ( OccEnv ) -import Type ( Type ) -import Class ( Class ) import Var ( Id, TyVar ) import VarEnv ( TidyEnv ) import Module -import SrcLoc ( SrcLoc ) +import SrcLoc ( SrcSpan, SrcLoc, srcSpanStart ) import VarSet ( IdSet ) import ErrUtils ( Messages, Message ) import UniqSupply ( UniqSupply ) @@ -84,9 +84,12 @@ import ListSetOps ( unionLists ) The monad itself has to be defined here, because it is mentioned by ErrCtxt \begin{code} -type TcRef a = IORef a -type TcId = Id -- Type may be a TcType -type TcIdSet = IdSet +type TcRef a = IORef a +type TcId = Id -- Type may be a TcType +type TcIdSet = IdSet +type TcDictBinds = DictBinds TcId -- Bag of dictionary bindings + + type TcRnIf a b c = IOEnv (Env a b) c type IfM lcl a = TcRnIf IfGblEnv lcl a -- Iface stuff @@ -108,14 +111,14 @@ type TcM a = TcRn a -- Historical data Env gbl lcl -- Changes as we move into an expression = Env { env_top :: HscEnv, -- Top-level stuff that never changes - -- Includes all info about imported things + -- Includes all info about imported things env_us :: TcRef UniqSupply, -- Unique supply for local varibles env_gbl :: gbl, -- Info about things defined at the top level - -- of the module being compiled + -- of the module being compiled - env_lcl :: lcl -- Nested stuff -- changes as we go into + env_lcl :: lcl -- Nested stuff; changes as we go into -- an expression } @@ -126,6 +129,9 @@ data Env gbl lcl -- Changes as we move into an expression data TcGblEnv = TcGblEnv { tcg_mod :: Module, -- Module being compiled + tcg_src :: HscSource, -- What kind of module + -- (regular Haskell, hs-boot, ext-core) + tcg_rdr_env :: GlobalRdrEnv, -- Top level envt; used during renaming tcg_default :: Maybe [Type], -- Types used for defaulting -- Nothing => no 'default' decl @@ -147,36 +153,57 @@ data TcGblEnv tcg_inst_env :: InstEnv, -- Instance envt for *home-package* modules -- Includes the dfuns in tcg_insts - tcg_inst_uses :: TcRef NameSet, -- Home-package Dfuns actually used - -- Used to generate version dependencies - -- This records usages, rather like tcg_dus, but it has to - -- be a mutable variable so it can be augmented - -- when we look up an instance. These uses of dfuns are - -- rather like the free variables of the program, but - -- are implicit instead of explicit. - -- Now a bunch of things about this module that are simply -- accumulated, but never consulted until the end. -- Nevertheless, it's convenient to accumulate them along -- with the rest of the info from this module. - tcg_exports :: Avails, -- What is exported - tcg_imports :: ImportAvails, -- Information about what was imported - -- from where, including things bound - -- in this module + tcg_exports :: NameSet, -- What is exported + tcg_imports :: ImportAvails, -- Information about what was imported + -- from where, including things bound + -- in this module + tcg_dus :: DefUses, -- What is defined in this module and what is used. -- The latter is used to generate -- (a) version tracking; no need to recompile if these -- things have not changed version stamp -- (b) unused-import info + tcg_keep :: TcRef NameSet, -- Locally-defined top-level names to keep alive + -- "Keep alive" means give them an Exported flag, so + -- that the simplifier does not discard them as dead + -- code, and so that they are exposed in the interface file + -- (but not to export to the user). + -- + -- Some things, like dict-fun Ids and default-method Ids are + -- "born" with the Exported flag on, for exactly the above reason, + -- but some we only discover as we go. Specifically: + -- * The to/from functions for generic data types + -- * Top-level variables appearing free in the RHS of an orphan rule + -- * Top-level variables appearing free in a TH bracket + + tcg_inst_uses :: TcRef NameSet, -- Home-package Dfuns actually used + -- Used to generate version dependencies + -- This records usages, rather like tcg_dus, but it has to + -- be a mutable variable so it can be augmented + -- when we look up an instance. These uses of dfuns are + -- rather like the free variables of the program, but + -- are implicit instead of explicit. + + tcg_th_used :: TcRef Bool, -- True <=> Template Haskell syntax used + -- We need this so that we can generate a dependency on the + -- Template Haskell package, becuase the desugarer is going to + -- emit loads of references to TH symbols. It's rather like + -- tcg_inst_uses; the reference is implicit rather than explicit, + -- so we have to zap a mutable variable. + -- The next fields accumulate the payload of the module -- The binds, rules and foreign-decl fiels are collected -- initially in un-zonked form and are finally zonked in tcRnSrcDecls - tcg_binds :: MonoBinds Id, -- Value bindings in this module + tcg_binds :: LHsBinds Id, -- Value bindings in this module tcg_deprecs :: Deprecations, -- ...Deprecations tcg_insts :: [DFunId], -- ...Instances - tcg_rules :: [RuleDecl Id], -- ...Rules - tcg_fords :: [ForeignDecl Id] -- ...Foreign import & exports + tcg_rules :: [LRuleDecl Id], -- ...Rules + tcg_fords :: [LForeignDecl Id] -- ...Foreign import & exports } \end{code} @@ -195,17 +222,10 @@ data IfGblEnv -- was originally a hi-boot file. -- We need the module name so we can test when it's appropriate -- to look in this env. - if_rec_types :: Maybe (Module, IfG TypeEnv), + if_rec_types :: Maybe (Module, IfG TypeEnv) -- Allows a read effect, so it can be in a mutable -- variable; c.f. handling the external package type env -- Nothing => interactive stuff, no loops possible - - if_is_boot :: ModuleEnv (ModuleName, IsBootInterface) - -- Tells what we know about boot interface files - -- When we're importing a module we know absolutely - -- nothing about, so we assume it's from - -- another package, where we aren't doing - -- dependency tracking. So it won't be a hi-boot file. } data IfLclEnv @@ -213,7 +233,14 @@ data IfLclEnv -- The module for the current IfaceDecl -- So if we see f = \x -> x -- it means M.f = \x -> x, where M is the if_mod - if_mod :: ModuleName, + if_mod :: Module, + + -- The field is used only for error reporting + -- if (say) there's a Lint error in it + if_loc :: SDoc, + -- Where the interface came from: + -- .hi file, or GHCi state, or ext core + -- plus which bit is currently being examined if_tv_env :: OccEnv TyVar, -- Nested tyvar bindings if_id_env :: OccEnv Id -- Nested id binding @@ -246,7 +273,7 @@ Why? Because they are now Ids not TcIds. This final GlobalEnv is data TcLclEnv -- Changes as we move inside an expression -- Discarded after typecheck/rename; not passed on to desugarer = TcLclEnv { - tcl_loc :: SrcLoc, -- Source location + tcl_loc :: SrcSpan, -- Source span tcl_ctxt :: ErrCtxt, -- Error context tcl_errs :: TcRef Messages, -- Place to accumulate errors @@ -254,6 +281,10 @@ data TcLclEnv -- Changes as we move inside an expression tcl_arrow_ctxt :: ArrowCtxt, -- Arrow-notation context tcl_rdr :: LocalRdrEnv, -- Local name envt + -- Maintained during renaming, of course, but also during + -- type checking, solely so that when renaming a Template-Haskell + -- splice we have the right environment for the renamer. + -- -- Does *not* include global name envt; may shadow it -- Includes both ordinary variables and type variables; -- they are kept distinct because tyvar have a different @@ -261,22 +292,58 @@ data TcLclEnv -- Changes as we move inside an expression -- We still need the unsullied global name env so that -- we can look up record field names - tcl_env :: NameEnv TcTyThing, -- The local type environment: Ids and TyVars - -- defined in this module + tcl_env :: NameEnv TcTyThing, -- The local type environment: Ids and TyVars + -- defined in this module tcl_tyvars :: TcRef TcTyVarSet, -- The "global tyvars" - -- Namely, the in-scope TyVars bound in tcl_lenv, + -- Namely, the in-scope TyVars bound in tcl_env, -- plus the tyvars mentioned in the types of Ids bound in tcl_lenv -- Why mutable? see notes with tcGetGlobalTyVars - tcl_lie :: TcRef LIE -- Place to accumulate type constraints + tcl_lie :: TcRef LIE, -- Place to accumulate type constraints + tcl_gadt :: GadtRefinement -- The current type refinement for GADTs + +----------------------------------------------------------- +-- Not yet; it's a new complication and I want to see whether it bites +-- tcl_given :: [Inst] -- Insts available in the current context (see Note [Given Insts]) +----------------------------------------------------------- } +type GadtRefinement = TvSubstEnv -- Binds rigid type variables to their refinements + +{- Note [Given Insts] + ~~~~~~~~~~~~~~~~~~ +Because of GADTs, we have to pass inwards the Insts provided by type signatures +and existential contexts. Consider + data T a where { T1 :: b -> b -> T [b] } + f :: Eq a => T a -> Bool + f (T1 x y) = [x]==[y] + +The constructor T1 binds an existential variable 'b', and we need Eq [b]. +Well, we have it, because Eq a refines to Eq [b], but we can only spot that if we +pass it inwards. + +-} + --------------------------- -- Template Haskell levels --------------------------- -type ThLevel = Int -- Always >= 0 +type ThLevel = Int + -- Indicates how many levels of brackets we are inside + -- (always >= 0) + -- Incremented when going inside a bracket, + -- decremented when going inside a splice + +impLevel, topLevel :: ThLevel +topLevel = 1 -- Things defined at top level of this module +impLevel = 0 -- Imported things; they can be used inside a top level splice +-- +-- For example: +-- f = ... +-- g1 = $(map ...) is OK +-- g2 = $(f ...) is not OK; because we havn't compiled f yet + data ThStage = Comp -- Ordinary compiling, at level topLevel @@ -289,16 +356,6 @@ topStage = Comp topSpliceStage = Splice (topLevel - 1) -- Stage for the body of a top-level splice -impLevel, topLevel :: ThLevel -topLevel = 1 -- Things defined at top level of this module -impLevel = 0 -- Imported things; they can be used inside a top level splice --- --- For example: --- f = ... --- g1 = $(map ...) is OK --- g2 = $(f ...) is not OK; because we havn't compiled f yet - - --------------------------- -- Arrow-notation stages --------------------------- @@ -339,17 +396,30 @@ topArrowCtxt = ArrCtxt { proc_level = topProcLevel, proc_banned = [] } data TcTyThing = AGlobal TyThing -- Used only in the return type of a lookup + | ATcId TcId ThLevel ProcLevel -- Ids defined in this module; may not be fully zonked - | ATyVar TyVar -- Type variables - | ARecTyCon TcKind -- Used temporarily, during kind checking, for the - | ARecClass TcKind -- tycons and clases in this recursive group + + | ATyVar Name TcType -- Type variables; tv -> type. It can't just be a TyVar + -- that is mutated to point to the type it is bound to, + -- because that would make it a wobbly type, and we + -- want pattern-bound lexically-scoped type variables to + -- be able to stand for rigid types + + | AThing TcKind -- Used temporarily, during kind checking, for the + -- tycons and clases in this recursive group instance Outputable TcTyThing where -- Debugging only - ppr (AGlobal g) = text "AGlobal" <+> ppr g - ppr (ATcId g tl pl) = text "ATcId" <+> ppr g <+> ppr tl <+> ppr pl - ppr (ATyVar t) = text "ATyVar" <+> ppr t - ppr (ARecTyCon k) = text "ARecTyCon" <+> ppr k - ppr (ARecClass k) = text "ARecClass" <+> ppr k + ppr (AGlobal g) = ppr g + ppr (ATcId g tl pl) = text "Identifier" <> + ifPprDebug (brackets (ppr g <> comma <> ppr tl <> comma <> ppr pl)) + ppr (ATyVar tv ty) = text "Type variable" <+> quotes (ppr tv) <+> pprParendType ty + ppr (AThing k) = text "AThing" <+> ppr k + +pprTcTyThingCategory :: TcTyThing -> SDoc +pprTcTyThingCategory (AGlobal thing) = pprTyThingCategory thing +pprTcTyThingCategory (ATyVar _ _) = ptext SLIT("Type variable") +pprTcTyThingCategory (ATcId _ _ _) = ptext SLIT("Local identifier") +pprTcTyThingCategory (AThing _) = ptext SLIT("Kinded thing") \end{code} \begin{code} @@ -362,32 +432,6 @@ type ErrCtxt = [TidyEnv -> TcM (TidyEnv, Message)] %************************************************************************ %* * - EntityUsage -%* * -%************************************************************************ - -EntityUsage tells what things are actually need in order to compile this -module. It is used for generating the usage-version field of the ModIface. - -Note that we do not record version info for entities from -other (non-home) packages. If the package changes, GHC doesn't help. - -\begin{code} -type EntityUsage = NameSet - -- The Names are all the (a) home-package - -- (b) "big" (i.e. no data cons, class ops) - -- (c) non-locally-defined - -- (d) non-wired-in - -- names that have been slurped in so far. - -- This is used to generate the "usage" information for this module. - -emptyUsages :: EntityUsage -emptyUsages = emptyNameSet -\end{code} - - -%************************************************************************ -%* * Operations over ImportAvails %* * %************************************************************************ @@ -403,29 +447,22 @@ It is used * when processing the export list \begin{code} data ImportAvails = ImportAvails { - imp_env :: AvailEnv, - -- All the things that are available from the import - -- Its domain is all the "main" things; - -- i.e. *excluding* class ops and constructors - -- (which appear inside their parent AvailTC) - - imp_qual :: ModuleEnv AvailEnv, - -- Used to figure out "module M" export specifiers + imp_env :: ModuleEnv NameSet, + -- All the things imported, classified by + -- the *module qualifier* for its import + -- e.g. import List as Foo + -- would add a binding Foo |-> ...stuff from List... + -- to imp_env. + -- + -- We need to classify them like this so that we can figure out + -- "module M" export specifiers in an export list -- (see 1.4 Report Section 5.1.1). Ultimately, we want to find -- everything that is unambiguously in scope as 'M.x' -- and where plain 'x' is (perhaps ambiguously) in scope. -- So the starting point is all things that are in scope as 'M.x', -- which is what this field tells us. - -- - -- Domain is the *module qualifier* for imports. - -- e.g. import List as Foo - -- would add a binding Foo |-> ...stuff from List... - -- to imp_qual. - -- We keep the stuff as an AvailEnv so that it's easy to - -- combine stuff coming from different (unqualified) - -- imports of the same module - imp_mods :: ModuleEnv (Module, Maybe Bool), + imp_mods :: ModuleEnv (Module, Maybe Bool, SrcSpan), -- Domain is all directly-imported modules -- Maybe value answers the question "is the import restricted?" -- Nothing => unrestricted import (e.g., "import Foo") @@ -443,33 +480,33 @@ data ImportAvails -- need to recompile if the module version changes -- (b) to specify what child modules to initialise - imp_dep_mods :: ModuleEnv (ModuleName, IsBootInterface), + imp_dep_mods :: ModuleEnv (Module, IsBootInterface), -- Home-package modules needed by the module being compiled -- - -- It doesn't matter whether any of these dependencies are actually - -- *used* when compiling the module; they are listed if they are below - -- it at all. For example, suppose M imports A which imports X. Then - -- compiling M might not need to consult X.hi, but X is still listed - -- in M's dependencies. - - imp_dep_pkgs :: [PackageName], + -- It doesn't matter whether any of these dependencies + -- are actually *used* when compiling the module; they + -- are listed if they are below it at all. For + -- example, suppose M imports A which imports X. Then + -- compiling M might not need to consult X.hi, but X + -- is still listed in M's dependencies. + + imp_dep_pkgs :: [PackageId], -- Packages needed by the module being compiled, whether -- directly, or via other modules in this package, or via -- modules imported from other packages. - imp_orphs :: [ModuleName] + imp_orphs :: [Module] -- Orphan modules below us in the import tree } -mkModDeps :: [(ModuleName, IsBootInterface)] - -> ModuleEnv (ModuleName, IsBootInterface) +mkModDeps :: [(Module, IsBootInterface)] + -> ModuleEnv (Module, IsBootInterface) mkModDeps deps = foldl add emptyModuleEnv deps where - add env elt@(m,_) = extendModuleEnvByName env m elt + add env elt@(m,_) = extendModuleEnv env m elt emptyImportAvails :: ImportAvails -emptyImportAvails = ImportAvails { imp_env = emptyAvailEnv, - imp_qual = emptyModuleEnv, +emptyImportAvails = ImportAvails { imp_env = emptyModuleEnv, imp_mods = emptyModuleEnv, imp_dep_mods = emptyModuleEnv, imp_dep_pkgs = [], @@ -477,12 +514,11 @@ emptyImportAvails = ImportAvails { imp_env = emptyAvailEnv, plusImportAvails :: ImportAvails -> ImportAvails -> ImportAvails plusImportAvails - (ImportAvails { imp_env = env1, imp_qual = unqual1, imp_mods = mods1, + (ImportAvails { imp_env = env1, imp_mods = mods1, imp_dep_mods = dmods1, imp_dep_pkgs = dpkgs1, imp_orphs = orphs1 }) - (ImportAvails { imp_env = env2, imp_qual = unqual2, imp_mods = mods2, + (ImportAvails { imp_env = env2, imp_mods = mods2, imp_dep_mods = dmods2, imp_dep_pkgs = dpkgs2, imp_orphs = orphs2 }) - = ImportAvails { imp_env = env1 `plusAvailEnv` env2, - imp_qual = plusModuleEnv_C plusAvailEnv unqual1 unqual2, + = ImportAvails { imp_env = plusModuleEnv_C unionNameSets env1 env2, imp_mods = mods1 `plusModuleEnv` mods2, imp_dep_mods = plusModuleEnv_C plus_mod_dep dmods1 dmods2, imp_dep_pkgs = dpkgs1 `unionLists` dpkgs2, @@ -598,7 +634,7 @@ type Int, represented by \begin{code} data Inst = Dict - Id + Name TcPredType InstLoc @@ -627,13 +663,13 @@ data Inst -- type of (f tys dicts(from theta)) = tau -- INVARIANT 2: tau must not be of form (Pred -> Tau) - -- Reason: two methods are considerd equal if the + -- Reason: two methods are considered equal if the -- base Id matches, and the instantiating types -- match. The TcThetaType should then match too. -- This only bites in the call to tcInstClassOp in TcClassDcl.mkMethodBind | LitInst - Id + Name HsOverLit -- The literal from the occurrence site -- INVARIANT: never a rebindable-syntax literal -- Reason: tcSyntaxName does unification, and we @@ -703,97 +739,61 @@ It appears in TcMonad because there are a couple of error-message-generation functions that deal with it. \begin{code} -data InstLoc = InstLoc InstOrigin SrcLoc ErrCtxt +data InstLoc = InstLoc InstOrigin SrcSpan ErrCtxt instLocSrcLoc :: InstLoc -> SrcLoc -instLocSrcLoc (InstLoc _ src_loc _) = src_loc +instLocSrcLoc (InstLoc _ src_span _) = srcSpanStart src_span -data InstOrigin - = OccurrenceOf Name -- Occurrence of an overloaded identifier +instLocSrcSpan :: InstLoc -> SrcSpan +instLocSrcSpan (InstLoc _ src_span _) = src_span - | IPOcc (IPName Name) -- Occurrence of an implicit parameter - | IPBind (IPName Name) -- Binding site of an implicit parameter +data InstOrigin + = SigOrigin SkolemInfo -- Pattern, class decl, inst decl etc; + -- Places that bind type variables and introduce + -- available constraints - | RecordUpdOrigin + | IPBindOrigin (IPName Name) -- Binding site of an implicit parameter - | DataDeclOrigin -- Typechecking a data declaration + ------------------------------------------------------- + -- The rest are all occurrences: Insts that are 'wanted' + ------------------------------------------------------- + | OccurrenceOf Name -- Occurrence of an overloaded identifier - | InstanceDeclOrigin -- Typechecking an instance decl + | IPOccOrigin (IPName Name) -- Occurrence of an implicit parameter | LiteralOrigin HsOverLit -- Occurrence of a literal - | PatOrigin RenamedPat - - | ArithSeqOrigin RenamedArithSeqInfo -- [x..], [x..y] etc - | PArrSeqOrigin RenamedArithSeqInfo -- [:x..y:] and [:x,y..z:] - - | SignatureOrigin -- A dict created from a type signature - | Rank2Origin -- A dict created when typechecking the argument - -- of a rank-2 typed function - - | DoOrigin -- The monad for a do expression - | ProcOrigin -- A proc expression + | ArithSeqOrigin (ArithSeqInfo Name) -- [x..], [x..y] etc + | PArrSeqOrigin (ArithSeqInfo Name) -- [:x..y:] and [:x,y..z:] - | ClassDeclOrigin -- Manufactured during a class decl + | InstSigOrigin -- A dict occurrence arising from instantiating + -- a polymorphic type during a subsumption check - | InstanceSpecOrigin Class -- in a SPECIALIZE instance pragma - Type - - -- When specialising instances the instance info attached to - -- each class is not yet ready, so we record it inside the - -- origin information. This is a bit of a hack, but it works - -- fine. (Patrick is to blame [WDP].) - - | ValSpecOrigin Name -- in a SPECIALIZE pragma for a value - - -- Argument or result of a ccall - -- Dictionaries with this origin aren't actually mentioned in the - -- translated term, and so need not be bound. Nor should they - -- be abstracted over. - - | UnknownOrigin -- Help! I give up... + | RecordUpdOrigin + | InstScOrigin -- Typechecking superclasses of an instance declaration + | DerivOrigin -- Typechecking deriving + | DefaultOrigin -- Typechecking a default decl + | DoOrigin -- Arising from a do expression + | ProcOrigin -- Arising from a proc expression \end{code} \begin{code} pprInstLoc :: InstLoc -> SDoc -pprInstLoc (InstLoc orig locn ctxt) +pprInstLoc (InstLoc orig locn _) = hsep [text "arising from", pp_orig orig, text "at", ppr locn] where - pp_orig (OccurrenceOf name) - = hsep [ptext SLIT("use of"), quotes (ppr name)] - pp_orig (IPOcc name) - = hsep [ptext SLIT("use of implicit parameter"), quotes (ppr name)] - pp_orig (IPBind name) - = hsep [ptext SLIT("binding for implicit parameter"), quotes (ppr name)] - pp_orig RecordUpdOrigin - = ptext SLIT("a record update") - pp_orig DataDeclOrigin - = ptext SLIT("the data type declaration") - pp_orig InstanceDeclOrigin - = ptext SLIT("the instance declaration") - pp_orig (LiteralOrigin lit) - = hsep [ptext SLIT("the literal"), quotes (ppr lit)] - pp_orig (PatOrigin pat) - = hsep [ptext SLIT("the pattern"), quotes (ppr pat)] - pp_orig (ArithSeqOrigin seq) - = hsep [ptext SLIT("the arithmetic sequence"), quotes (ppr seq)] - pp_orig (PArrSeqOrigin seq) - = hsep [ptext SLIT("the parallel array sequence"), quotes (ppr seq)] - pp_orig (SignatureOrigin) - = ptext SLIT("a type signature") - pp_orig (Rank2Origin) - = ptext SLIT("a function with an overloaded argument type") - pp_orig (DoOrigin) - = ptext SLIT("a do statement") - pp_orig (ProcOrigin) - = ptext SLIT("a proc expression") - pp_orig (ClassDeclOrigin) - = ptext SLIT("a class declaration") - pp_orig (InstanceSpecOrigin clas ty) - = hsep [text "a SPECIALIZE instance pragma; class", - quotes (ppr clas), text "type:", ppr ty] - pp_orig (ValSpecOrigin name) - = hsep [ptext SLIT("a SPECIALIZE user-pragma for"), quotes (ppr name)] - pp_orig (UnknownOrigin) - = ptext SLIT("...oops -- I don't know where the overloading came from!") + pp_orig (OccurrenceOf name) = hsep [ptext SLIT("use of"), quotes (ppr name)] + pp_orig (IPOccOrigin name) = hsep [ptext SLIT("use of implicit parameter"), quotes (ppr name)] + pp_orig (IPBindOrigin name) = hsep [ptext SLIT("binding for implicit parameter"), quotes (ppr name)] + pp_orig RecordUpdOrigin = ptext SLIT("a record update") + pp_orig (LiteralOrigin lit) = hsep [ptext SLIT("the literal"), quotes (ppr lit)] + pp_orig (ArithSeqOrigin seq) = hsep [ptext SLIT("the arithmetic sequence"), quotes (ppr seq)] + pp_orig (PArrSeqOrigin seq) = hsep [ptext SLIT("the parallel array sequence"), quotes (ppr seq)] + pp_orig InstSigOrigin = ptext SLIT("instantiating a type signature") + pp_orig InstScOrigin = ptext SLIT("the superclasses of an instance declaration") + pp_orig DerivOrigin = ptext SLIT("the 'deriving' clause of a data type declaration") + pp_orig DefaultOrigin = ptext SLIT("a 'default' declaration") + pp_orig DoOrigin = ptext SLIT("a do statement") + pp_orig ProcOrigin = ptext SLIT("a proc expression") + pp_orig (SigOrigin info) = pprSkolInfo info \end{code}