%
+% (c) The University of Glasgow 2006
% (c) The GRASP Project, Glasgow University, 1992-2002
%
\begin{code}
-- Typechecker types
TcTyThing(..), pprTcTyThingCategory,
- GadtRefinement,
-- Template Haskell
ThStage(..), topStage, topSpliceStage,
#include "HsVersions.h"
-import HsSyn ( PendingSplice, HsOverLit, LRuleDecl, LForeignDecl,
- ArithSeqInfo, DictBinds, LHsBinds, LImportDecl, HsGroup,
- IE )
-import HscTypes ( FixityEnv,
- HscEnv, TypeEnv, TyThing,
- GenAvailInfo(..), AvailInfo, HscSource(..),
- availName, IsBootInterface, Deprecations )
-import Packages ( PackageId )
-import Type ( Type, pprTyThingCategory )
-import TcType ( TcTyVarSet, TcType, TcThetaType, SkolemInfo, TvSubst,
- TcPredType, TcKind, tcCmpPred, tcCmpType, tcCmpTypes, pprSkolInfo )
-import InstEnv ( Instance, InstEnv )
+import HsSyn hiding (LIE)
+import HscTypes
+import Packages
+import Type
+import TcType
+import InstEnv
+import FamInstEnv
import IOEnv
-import RdrName ( GlobalRdrEnv, LocalRdrEnv )
-import Name ( Name )
+import RdrName
+import Name
import NameEnv
-import NameSet ( NameSet, unionNameSets, DefUses )
-import Var ( Id, TyVar )
-import VarEnv ( TidyEnv )
+import NameSet
+import Var
+import VarEnv
import Module
import UniqFM
-import SrcLoc ( SrcSpan, SrcLoc, Located, srcSpanStart )
-import VarSet ( IdSet )
-import ErrUtils ( Messages, Message )
-import UniqFM ( UniqFM )
-import UniqSupply ( UniqSupply )
-import BasicTypes ( IPName )
-import Util ( thenCmp )
+import SrcLoc
+import VarSet
+import ErrUtils
+import UniqSupply
+import BasicTypes
+import Util
import Bag
import Outputable
-import Maybe ( mapMaybe )
-import ListSetOps ( unionLists )
+import ListSetOps
+
+import Data.Maybe
+import Data.List
\end{code}
-- bound in this module when dealing with hi-boot recursions
-- Updated at intervals (e.g. after dealing with types and classes)
- tcg_inst_env :: InstEnv, -- Instance envt for *home-package* modules
- -- Includes the dfuns in tcg_insts
+ tcg_inst_env :: InstEnv, -- Instance envt for *home-package*
+ -- modules; Includes the dfuns in
+ -- tcg_insts
+ tcg_fam_inst_env :: FamInstEnv, -- Ditto for family instances
+
-- 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 :: NameSet, -- What is exported
+ tcg_exports :: [AvailInfo], -- What is exported
tcg_imports :: ImportAvails, -- Information about what was imported
-- from where, including things bound
-- in this module
tcg_rn_decls :: Maybe (HsGroup Name), -- renamed decls, maybe
-- Nothing <=> Don't retain renamed decls
- tcg_binds :: LHsBinds Id, -- Value bindings in this module
- tcg_deprecs :: Deprecations, -- ...Deprecations
- tcg_insts :: [Instance], -- ...Instances
- tcg_rules :: [LRuleDecl Id], -- ...Rules
- tcg_fords :: [LForeignDecl Id] -- ...Foreign import & exports
+ tcg_binds :: LHsBinds Id, -- Value bindings in this module
+ tcg_deprecs :: Deprecations, -- ...Deprecations
+ tcg_insts :: [Instance], -- ...Instances
+ tcg_fam_insts :: [FamInst], -- ...Family instances
+ tcg_rules :: [LRuleDecl Id], -- ...Rules
+ tcg_fords :: [LForeignDecl Id], -- ...Foreign import & exports
+
+ tcg_doc :: Maybe (HsDoc Name), -- Maybe Haddock documentation
+ tcg_hmi :: HaddockModInfo Name -- Haddock module information
}
\end{code}
tcl_lie :: TcRef LIE -- Place to accumulate type constraints
}
-type GadtRefinement = TvSubst
{- Note [Given Insts]
~~~~~~~~~~~~~~~~~~
data TcTyThing
= AGlobal TyThing -- Used only in the return type of a lookup
- | ATcId TcId -- Ids defined in this module; may not be fully zonked
- ThLevel
- Bool -- True <=> apply the type refinement to me
+ | ATcId { -- Ids defined in this module; may not be fully zonked
+ tct_id :: TcId,
+ tct_co :: Maybe HsWrapper, -- Nothing <=> Do not apply a GADT type refinement
+ -- I am wobbly, or have no free
+ -- type variables
+ -- Just co <=> Apply any type refinement to me,
+ -- and record it in the coercion
+ tct_type :: TcType, -- Type of (coercion applied to id)
+ tct_level :: ThLevel }
| ATyVar Name TcType -- The type to which the lexically scoped type vaiable
-- is currently refined. We only need the Name
instance Outputable TcTyThing where -- Debugging only
ppr (AGlobal g) = ppr g
- ppr (ATcId g tl rig) = text "Identifier" <>
- ifPprDebug (brackets (ppr g <> comma <> ppr tl <+> ppr rig))
+ ppr elt@(ATcId {}) = text "Identifier" <>
+ ifPprDebug (brackets (ppr (tct_id elt) <> dcolon <> ppr (tct_type elt) <> comma
+ <+> ppr (tct_level elt) <+> ppr (tct_co elt)))
ppr (ATyVar tv _) = text "Type variable" <+> quotes (ppr tv)
ppr (AThing k) = text "AThing" <+> ppr k
\begin{code}
data ImportAvails
= ImportAvails {
- imp_env :: ModuleNameEnv NameSet,
- -- All the things imported, classified by
+ imp_env :: ModuleNameEnv [AvailInfo],
+ -- All the things imported *unqualified*, 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.
+ -- This is exactly the list of things that will be exported
+ -- by a 'module M' specifier in the export list.
+ -- (see Haskell 98 Report Section 5.2).
+ --
+ -- Warning: there may be duplciates in this list,
+ -- duplicates are removed at the use site (rnExports).
+ -- We might consider turning this into a NameEnv at
+ -- some point.
imp_mods :: ModuleEnv (Module, Bool, SrcSpan),
-- Domain is all directly-imported modules
-- the interface file; if we import somethign we
-- need to recompile if the export version changes
-- (b) to specify what child modules to initialise
+ --
+ -- We need a full ModuleEnv rather than a ModuleNameEnv
+ -- here, because we might be importing modules of the
+ -- same name from different packages. (currently not the case,
+ -- but might be in the future).
imp_dep_mods :: ModuleNameEnv (ModuleName, IsBootInterface),
-- Home-package modules needed by the module being compiled
-- directly, or via other modules in this package, or via
-- modules imported from other packages.
- imp_orphs :: [Module]
+ imp_orphs :: [Module],
-- Orphan modules below us in the import tree
+
+ imp_parent :: NameEnv AvailInfo
+ -- for the names in scope in this module, tells us
+ -- the relationship between parents and children
+ -- (eg. a TyCon is the parent of its DataCons, a
+ -- class is the parent of its methods, etc.).
}
mkModDeps :: [(ModuleName, IsBootInterface)]
imp_mods = emptyModuleEnv,
imp_dep_mods = emptyUFM,
imp_dep_pkgs = [],
- imp_orphs = [] }
+ imp_orphs = [],
+ imp_parent = emptyNameEnv }
plusImportAvails :: ImportAvails -> ImportAvails -> ImportAvails
plusImportAvails
(ImportAvails { imp_env = env1, imp_mods = mods1,
- imp_dep_mods = dmods1, imp_dep_pkgs = dpkgs1, imp_orphs = orphs1 })
+ imp_dep_mods = dmods1, imp_dep_pkgs = dpkgs1,
+ imp_orphs = orphs1, imp_parent = parent1 })
(ImportAvails { imp_env = env2, imp_mods = mods2,
- imp_dep_mods = dmods2, imp_dep_pkgs = dpkgs2, imp_orphs = orphs2 })
- = ImportAvails { imp_env = plusUFM_C unionNameSets env1 env2,
+ imp_dep_mods = dmods2, imp_dep_pkgs = dpkgs2,
+ imp_orphs = orphs2, imp_parent = parent2 })
+ = ImportAvails { imp_env = plusUFM_C (++) env1 env2,
imp_mods = mods1 `plusModuleEnv` mods2,
imp_dep_mods = plusUFM_C plus_mod_dep dmods1 dmods2,
imp_dep_pkgs = dpkgs1 `unionLists` dpkgs2,
- imp_orphs = orphs1 `unionLists` orphs2 }
+ imp_orphs = orphs1 `unionLists` orphs2,
+ imp_parent = plusNameEnv_C plus_avails parent1 parent2 }
where
+ plus_avails (AvailTC tc subs1) (AvailTC _ subs2)
+ = AvailTC tc (nub (subs1 ++ subs2))
+ plus_avails avail _ = avail
+
plus_mod_dep (m1, boot1) (m2, boot2)
= WARN( not (m1 == m2), (ppr m1 <+> ppr m2) $$ (ppr boot1 <+> ppr boot2) )
-- Check mod-names match
| RecordUpdOrigin
| InstScOrigin -- Typechecking superclasses of an instance declaration
| DerivOrigin -- Typechecking deriving
+ | StandAloneDerivOrigin -- Typechecking stand-alone deriving
| DefaultOrigin -- Typechecking a default decl
| DoOrigin -- Arising from a do expression
| ProcOrigin -- Arising from a proc expression
\begin{code}
pprInstLoc :: InstLoc -> SDoc
pprInstLoc (InstLoc orig locn _)
- = hsep [text "arising from", pp_orig orig, text "at", ppr locn]
+ = sep [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 (IPOccOrigin name) = hsep [ptext SLIT("use of implicit parameter"), quotes (ppr name)]
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 StandAloneDerivOrigin = ptext SLIT("a 'deriving' 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")
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