-- Ranamer types
RnMode(..), isInterfaceMode, isCmdLineMode,
- Usages(..), emptyUsages, ErrCtxt,
- ImportAvails(..), emptyImportAvails, plusImportAvails, mkImportAvails,
+ EntityUsage, emptyUsages, ErrCtxt,
+ ImportAvails(..), emptyImportAvails, plusImportAvails,
plusAvail, pruneAvails,
- AvailEnv, emptyAvailEnv, unitAvailEnv, plusAvailEnv, lookupAvailEnv, availEnvElts, addAvail,
+ AvailEnv, emptyAvailEnv, unitAvailEnv, plusAvailEnv,
+ mkAvailEnv, lookupAvailEnv, availEnvElts, addAvail,
WhereFrom(..),
-- Typechecker types
Level, impLevel, topLevel,
-- Insts
- Inst(..), InstOrigin(..), InstLoc, pprInstLoc,
+ Inst(..), InstOrigin(..), InstLoc(..), pprInstLoc, instLocSrcLoc,
LIE, emptyLIE, unitLIE, plusLIE, consLIE,
plusLIEs, mkLIE, isEmptyLIE, lieToList, listToLIE,
import HscTypes ( GhciMode, ExternalPackageState, HomePackageTable, NameCache,
GlobalRdrEnv, LocalRdrEnv, FixityEnv, TypeEnv, TyThing,
Avails, GenAvailInfo(..), AvailInfo, availName,
- IsBootInterface, Deprecations, unQualInScope )
+ IsBootInterface, Deprecations )
+import Packages ( PackageName )
import TcType ( TcTyVarSet, TcType, TcTauType, TcThetaType, TcPredType, TcKind,
tcCmpPred, tcCmpType, tcCmpTypes )
import InstEnv ( DFunId, InstEnv )
import DATA_IOREF ( IORef, newIORef, readIORef, writeIORef )
import UNSAFE_IO ( unsafeInterleaveIO )
import FIX_IO ( fixIO )
+import EXCEPTION ( Exception )
import Maybe ( mapMaybe )
-import List ( nub )
-import Control.Exception as Exception ( try, Exception )
+import ListSetOps ( unionLists )
+import Panic ( tryMost )
\end{code}
Error recovery
\begin{code}
-tryM :: TcRn m r -> TcRn m (Either Exception.Exception r)
+tryM :: TcRn m r -> TcRn m (Either Exception r)
-- Reflect exception into TcRn monad
-tryM (TcRn thing) = TcRn (\ env -> Exception.try (thing env))
+tryM (TcRn thing) = TcRn (\ env -> tryMost (thing env))
\end{code}
Lazy interleave
-- PIT, ImportedModuleInfo
-- DeclsMap, IfaceRules, IfaceInsts, InstGates
-- TypeEnv, InstEnv, RuleBase
+ -- Mutable, because we demand-load declarations that extend the state
top_hpt :: HomePackageTable,
-- The home package table that we've accumulated while
data TcGblEnv
= TcGblEnv {
tcg_mod :: Module, -- Module being compiled
- tcg_usages :: TcRef Usages, -- What version of what entities
- -- have been used from other modules
- -- (whether home or ext-package modules)
+ tcg_usages :: TcRef EntityUsage, -- What version of what entities
+ -- have been used from other home-pkg modules
tcg_rdr_env :: GlobalRdrEnv, -- Top level envt; used during renaming
tcg_fix_env :: FixityEnv, -- Ditto
tcg_default :: [Type], -- Types used for defaulting
-- (Ids defined in this module start in the local envt,
-- though they move to the global envt during zonking)
- -- Cached things
- tcg_ist :: Name -> Maybe TyThing, -- Imported symbol table
- -- Global type env: a combination of tcg_eps, tcg_hpt
- -- (but *not* tcg_type_env; no deep reason)
- -- When the PCS changes this must be refreshed,
- -- notably after running some compile-time code
-
- tcg_inst_env :: InstEnv, -- Global instance env: a combination of
+ tcg_inst_env :: TcRef InstEnv, -- Global instance env: a combination of
-- tc_pcs, tc_hpt, *and* tc_insts
+ -- This field is mutable so that it can be updated inside a
+ -- Template Haskell splice, which might suck in some new
+ -- instance declarations. This is a slightly different strategy
+ -- than for the type envt, where we look up first in tcg_type_env
+ -- and then in the mutable EPS, because the InstEnv for this module
+ -- is constructed (in principle at least) only from the modules
+ -- 'below' this one, so it's this-module-specific
+ --
+ -- On the other hand, a declaration quote [d| ... |] may introduce
+ -- some new instance declarations that we *don't* want to persist
+ -- outside the quote, so we tiresomely need to revert the InstEnv
+ -- after finishing the quote (see TcSplice.tcBracket)
-- Now a bunch of things about this module that are simply
-- accumulated, but never consulted until the end.
tcg_imports :: ImportAvails, -- Information about what was imported
-- from where, including things bound
-- in this module
- -- The next fields are always fully zonked
+
+ -- 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_deprecs :: Deprecations, -- ...Deprecations
tcg_insts :: [DFunId], -- ...Instances
impLevel, topLevel :: Level
-topLevel = 1 -- Things dedined at top level of this module
+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:
-- 2. Then we kind-check the (T a Int) part.
-- 3. Then we zonk the kind variable.
-- 4. Now we know the kind for 'a', and we add (a -> ATyVar a::K) to the environment
+
+instance Outputable TcTyThing where -- Debugging only
+ ppr (AGlobal g) = text "AGlobal" <+> ppr g
+ ppr (ATcId g l) = text "ATcId" <+> ppr g <+> ppr l
+ ppr (ATyVar t) = text "ATyVar" <+> ppr t
+ ppr (AThing k) = text "AThing" <+> ppr k
\end{code}
\begin{code}
%************************************************************************
%* *
- Usages
+ EntityUsage
%* *
%************************************************************************
-Usages tells what things are actually need in order to compile this
-module. It is used
- * for generating the usages field of the ModIface
- * for reporting unused things in scope
+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.
-\begin{code}
-data Usages
- = Usages {
- usg_ext :: ModuleSet,
- -- The non-home-package modules from which we have
- -- slurped at least one name.
-
- usg_home :: 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.
- }
+Note that we do not record version info for entities from
+other (non-home) packages. If the package changes, GHC doesn't help.
-emptyUsages :: Usages
-emptyUsages = Usages { usg_ext = emptyModuleSet,
- usg_home = emptyNameSet }
+\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}
-- i.e. *excluding* class ops and constructors
-- (which appear inside their parent AvailTC)
- imp_unqual :: ModuleEnv Avails,
+ imp_qual :: ModuleEnv AvailEnv,
-- Used to figure out "module M" export specifiers
- -- Domain is only modules with *unqualified* imports
- -- (see 1.4 Report Section 5.1.1)
- -- The list of Avails is cumulative, not necessarily
- -- nicely uniquified. For example, we might have Maybe(Nothing)
- -- and Maybe(Just) in the list, separately.
-
- imp_mods :: ModuleEnv (Module, Bool)
+ -- (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, Bool),
-- Domain is all directly-imported modules
-- Bool is True if there was an unrestricted import
-- (i.e. not a selective list)
-- the interface file; if we import everything we
-- need to recompile if the module version changes
-- (b) to specify what child modules to initialise
+
+ imp_dep_mods :: ModuleEnv (ModuleName, 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],
+ -- 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]
+ -- Orphan modules below us in the import tree
}
emptyImportAvails :: ImportAvails
-emptyImportAvails = ImportAvails { imp_env = emptyAvailEnv,
- imp_unqual = emptyModuleEnv,
- imp_mods = emptyModuleEnv }
+emptyImportAvails = ImportAvails { imp_env = emptyAvailEnv,
+ imp_qual = emptyModuleEnv,
+ imp_mods = emptyModuleEnv,
+ imp_dep_mods = emptyModuleEnv,
+ imp_dep_pkgs = [],
+ imp_orphs = [] }
plusImportAvails :: ImportAvails -> ImportAvails -> ImportAvails
plusImportAvails
- (ImportAvails { imp_env = env1, imp_unqual = unqual1, imp_mods = mods1 })
- (ImportAvails { imp_env = env2, imp_unqual = unqual2, imp_mods = mods2 })
- = ImportAvails { imp_env = env1 `plusAvailEnv` env2,
- imp_unqual = plusModuleEnv_C (++) unqual1 unqual2,
- imp_mods = mods1 `plusModuleEnv` mods2 }
-
-mkImportAvails :: ModuleName -> Bool
- -> GlobalRdrEnv -> [AvailInfo] -> ImportAvails
-mkImportAvails mod_name unqual_imp gbl_env avails
- = ImportAvails { imp_unqual = mod_avail_env,
- imp_env = entity_avail_env,
- imp_mods = emptyModuleEnv }-- Stays empty for module being compiled;
- -- gets updated for imported modules
+ (ImportAvails { imp_env = env1, imp_qual = unqual1, imp_mods = mods1,
+ imp_dep_mods = dmods1, imp_dep_pkgs = dpkgs1, imp_orphs = orphs1 })
+ (ImportAvails { imp_env = env2, imp_qual = unqual2, 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,
+ imp_mods = mods1 `plusModuleEnv` mods2,
+ imp_dep_mods = plusModuleEnv_C plus_mod_dep dmods1 dmods2,
+ imp_dep_pkgs = dpkgs1 `unionLists` dpkgs2,
+ imp_orphs = orphs1 `unionLists` orphs2 }
where
- mod_avail_env = unitModuleEnvByName mod_name unqual_avails
-
- -- unqual_avails is the Avails that are visible in *unqualified* form
- -- We need to know this so we know what to export when we see
- -- module M ( module P ) where ...
- -- Then we must export whatever came from P unqualified.
-
- unqual_avails | not unqual_imp = [] -- Short cut when no unqualified imports
- | otherwise = pruneAvails (unQualInScope gbl_env) avails
-
- entity_avail_env = foldl insert emptyAvailEnv avails
- insert env avail = extendNameEnv_C plusAvail env (availName avail) avail
- -- 'avails' may have several items with the same availName
- -- E.g import Ix( Ix(..), index )
- -- will give Ix(Ix,index,range) and Ix(index)
- -- We want to combine these
+ plus_mod_dep (m1, boot1) (m2, boot2)
+ = WARN( not (m1 == m2), (ppr m1 <+> ppr m2) $$ (ppr boot1 <+> ppr boot2) )
+ -- Check mod-names match
+ (m1, boot1 && boot2) -- If either side can "see" a non-hi-boot interface, use that
\end{code}
%************************************************************************
\begin{code}
plusAvail (Avail n1) (Avail n2) = Avail n1
-plusAvail (AvailTC n1 ns1) (AvailTC n2 ns2) = AvailTC n2 (nub (ns1 ++ ns2))
+plusAvail (AvailTC n1 ns1) (AvailTC n2 ns2) = AvailTC n2 (ns1 `unionLists` ns2)
-- Added SOF 4/97
#ifdef DEBUG
plusAvail a1 a2 = pprPanic "RnEnv.plusAvail" (hsep [ppr a1,ppr a2])
addAvail :: AvailEnv -> AvailInfo -> AvailEnv
addAvail avails avail = extendNameEnv_C plusAvail avails (availName avail) avail
+
+mkAvailEnv :: [AvailInfo] -> AvailEnv
+ -- 'avails' may have several items with the same availName
+ -- E.g import Ix( Ix(..), index )
+ -- will give Ix(Ix,index,range) and Ix(index)
+ -- We want to combine these; addAvail does that
+mkAvailEnv avails = foldl addAvail emptyAvailEnv avails
\end{code}
%************************************************************************
| ImportForUsage IsBootInterface -- Import when chasing usage info from an interaface file
-- Failure in this case is not an error
- | ImportBySystem -- Non user import. Use eps_mod_info to decide whether
- -- the module this module depends on, or is a system-ish module;
- -- M.hi-boot otherwise
+ | ImportBySystem -- Non user import.
instance Outputable WhereFrom where
ppr (ImportByUser is_boot) | is_boot = ptext SLIT("{- SOURCE -}")
TcThetaType -- The (types of the) dictionaries to which the function
-- must be applied to get the method
- TcTauType -- The type of the method
+ TcTauType -- The tau-type of the method
InstLoc
- -- INVARIANT: in (Method u f tys theta tau loc)
+ -- INVARIANT 1: in (Method u f tys theta tau loc)
-- 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
+ -- 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
HsOverLit -- The literal from the occurrence site
functions that deal with it.
\begin{code}
-type InstLoc = (InstOrigin, SrcLoc, ErrCtxt)
+data InstLoc = InstLoc InstOrigin SrcLoc ErrCtxt
+
+instLocSrcLoc :: InstLoc -> SrcLoc
+instLocSrcLoc (InstLoc _ src_loc _) = src_loc
data InstOrigin
= OccurrenceOf Name -- Occurrence of an overloaded identifier
\begin{code}
pprInstLoc :: InstLoc -> SDoc
-pprInstLoc (orig, locn, ctxt)
+pprInstLoc (InstLoc orig locn ctxt)
= hsep [text "arising from", pp_orig orig, text "at", ppr locn]
where
pp_orig (OccurrenceOf name)
projects / ghc-hetmet.git / blobdiff