import CmdLineOpts ( DynFlag(..), DynFlags, dopt )
import HsSyn ( HsBinds(..), MonoBinds(..), HsDecl(..), HsExpr(..),
Stmt(..), InPat(..), HsMatchContext(..), HsDoContext(..), RuleDecl(..),
- isIfaceRuleDecl, nullBinds, mkSimpleMatch, placeHolderType
+ isSourceInstDecl, nullBinds, mkSimpleMatch, placeHolderType
)
import PrelNames ( mAIN_Name, mainName, ioTyConName, printName,
returnIOName, bindIOName, failIOName,
)
import MkId ( unsafeCoerceId )
import RnHsSyn ( RenamedHsBinds, RenamedHsDecl, RenamedStmt,
- RenamedHsExpr )
+ RenamedHsExpr, RenamedRuleDecl, RenamedTyClDecl, RenamedInstDecl )
import TcHsSyn ( TypecheckedMonoBinds, TypecheckedHsExpr,
TypecheckedForeignDecl, TypecheckedRuleDecl,
zonkTopBinds, zonkForeignExports, zonkRules, mkHsLet,
import TcDefaults ( tcDefaults, defaultDefaultTys )
import TcEnv ( TcEnv, RecTcEnv, InstInfo(iDFunId), tcExtendGlobalValEnv, tcLookup_maybe,
isLocalThing, tcSetEnv, tcSetInstEnv, initTcEnv, getTcGEnv,
- tcExtendGlobalTypeEnv, tcLookupGlobalId, tcLookupTyCon,
- TcTyThing(..), tcLookupId
+ tcExtendGlobalEnv, tcExtendGlobalTypeEnv,
+ tcLookupGlobalId, tcLookupTyCon,
+ TcTyThing(..), TyThing(..), tcLookupId
)
import TcRules ( tcIfaceRules, tcSourceRules )
import TcForeign ( tcForeignImports, tcForeignExports )
import TcIfaceSig ( tcInterfaceSigs )
-import TcInstDcls ( tcInstDecls1, tcInstDecls2 )
+import TcInstDcls ( tcInstDecls1, tcIfaceInstDecls1, addInstDFuns, tcInstDecls2 )
import TcUnify ( unifyTauTy )
import TcSimplify ( tcSimplifyTop, tcSimplifyInfer )
import TcTyClsDecls ( tcTyAndClassDecls )
import TysWiredIn ( mkListTy, unitTy )
import ErrUtils ( printErrorsAndWarnings, errorsFound,
dumpIfSet_dyn, dumpIfSet_dyn_or, showPass )
+import Rules ( extendRuleBase )
import Id ( Id, idType, idUnfolding )
import Module ( Module, moduleName )
import Name ( Name )
TypeEnv, extendTypeEnvList, typeEnvTyCons, typeEnvElts,
mkTypeEnv
)
+import List ( partition )
\end{code}
tcSetDefaultTys defaultDefaultTys $
-- Typecheck the extra declarations
- tcExtraDecls pcs hst get_fixity this_mod iface_decls `thenTc` \ (new_pcs, env) ->
+ tcExtraDecls pcs this_mod iface_decls `thenTc` \ (new_pcs, env) ->
tcSetEnv env $
tcExtendGlobalTypeEnv ic_type_env $
ioToTc (dumpIfSet_dyn dflags Opt_D_dump_tc "Typechecked" (ppr zonked_expr)) `thenNF_Tc_`
returnTc (new_pcs, zonked_expr, zonked_ids, error "typecheckStmt: no type")
-
- where
- get_fixity :: Name -> Maybe Fixity
- get_fixity n = pprPanic "typecheckStmt" (ppr n)
\end{code}
Here is the grand plan, implemented in tcUserStmt
tcSetDefaultTys defaultDefaultTys $
-- Typecheck the extra declarations
- tcExtraDecls pcs hst get_fixity this_mod decls `thenTc` \ (new_pcs, env) ->
+ tcExtraDecls pcs this_mod decls `thenTc` \ (new_pcs, env) ->
-- Now typecheck the expression
tcSetEnv env $
returnTc (new_pcs, zonked_expr, [], zonked_ty)
where
- get_fixity :: Name -> Maybe Fixity
- get_fixity n = pprPanic "typecheckExpr" (ppr n)
-
smpl_doc = ptext SLIT("main expression")
\end{code}
-> [RenamedHsDecl] -- extra decls sucked in from interface files
-> IO (Maybe PersistentCompilerState)
-typecheckExtraDecls dflags pcs hst unqual this_mod decls
+typecheckExtraDecls dflags pcs hst unqual this_mod decls
= typecheck dflags pcs hst unqual $
- tcExtraDecls pcs hst get_fixity this_mod decls
- `thenTc` \ (new_pcs, env) ->
- returnTc new_pcs
- where
- get_fixity n = pprPanic "typecheckExpr" (ppr n)
-
-tcExtraDecls pcs hst get_fixity this_mod decls =
- fixTc (\ ~(unf_env, _, _, _, _, _) ->
- tcImports unf_env pcs hst get_fixity this_mod decls
- ) `thenTc` \ (env, new_pcs, local_inst_info, local_inst_dfuns,
- deriv_binds, local_rules) ->
- ASSERT( null local_inst_info && nullBinds deriv_binds && null local_rules
- && null local_inst_dfuns )
- returnTc (new_pcs, env)
+ tcExtraDecls pcs this_mod decls `thenTc` \ (new_pcs, _) ->
+ returnTc new_pcs
+
+tcExtraDecls :: PersistentCompilerState
+ -> Module
+ -> [RenamedHsDecl]
+ -> TcM (PersistentCompilerState, TcEnv)
+
+tcExtraDecls pcs this_mod decls
+ = tcIfaceImports this_mod decls `thenTc` \ (env, all_things, dfuns, rules) ->
+ addInstDFuns (pcs_insts pcs) dfuns `thenNF_Tc` \ new_pcs_insts ->
+ let
+ new_pcs_pte = extendTypeEnvList (pcs_PTE pcs) all_things
+ new_pcs_rules = addIfaceRules (pcs_rules pcs) rules
+
+ new_pcs :: PersistentCompilerState
+ new_pcs = pcs { pcs_PTE = new_pcs_pte,
+ pcs_insts = new_pcs_insts,
+ pcs_rules = new_pcs_rules
+ }
+ in
+ -- Add the new instances
+ tcSetEnv env (tcSetInstEnv new_pcs_insts tcGetEnv) `thenNF_Tc` \ new_env ->
+ returnTc (new_pcs, new_env)
\end{code}
+
%************************************************************************
%* *
\subsection{Typechecking a module}
-- in this module, which is why the knot is so big
-- Type-check the type and class decls, and all imported decls
- tcImports unf_env pcs hst get_fixity this_mod decls
- `thenTc` \ (env, new_pcs, local_inst_info, local_inst_dfuns, deriv_binds, local_rules) ->
+ tcImports unf_env pcs hst get_fixity this_mod
+ tycl_decls iface_inst_decls iface_rule_decls `thenTc` \ (env1, new_pcs) ->
+
+ tcSetEnv env1 $
- tcSetEnv env $
+ -- Do the source-language instances, including derivings
+ tcInstDecls1 new_pcs hst unf_env
+ get_fixity this_mod
+ tycl_decls src_inst_decls `thenTc` \ (inst_env, inst_info, deriv_binds) ->
+ tcSetInstEnv inst_env $
-- Foreign import declarations next
traceTc (text "Tc4") `thenNF_Tc_`
-- We also typecheck any extra binds that came out of the "deriving" process
traceTc (text "Default types" <+> ppr defaulting_tys) `thenNF_Tc_`
traceTc (text "Tc5") `thenNF_Tc_`
- tcTopBinds (val_binds `ThenBinds` deriv_binds) `thenTc` \ ((val_binds, env), lie_valdecls) ->
+ tcTopBinds (val_binds `ThenBinds` deriv_binds) `thenTc` \ ((val_binds, env2), lie_valdecls) ->
-- Second pass over class and instance declarations,
-- plus rules and foreign exports, to generate bindings
- tcSetEnv env $
+ tcSetEnv env2 $
+ traceTc (text "Tc6") `thenNF_Tc_`
+ traceTc (ppr (getTcGEnv env2)) `thenNF_Tc_`
tcClassDecls2 this_mod tycl_decls `thenNF_Tc` \ (lie_clasdecls, cls_dm_binds, dm_ids) ->
tcExtendGlobalValEnv dm_ids $
- tcInstDecls2 local_inst_info `thenNF_Tc` \ (lie_instdecls, inst_binds) ->
+ traceTc (text "Tc7") `thenNF_Tc_`
+ tcInstDecls2 inst_info `thenNF_Tc` \ (lie_instdecls, inst_binds) ->
+ traceTc (text "Tc8") `thenNF_Tc_`
tcForeignExports decls `thenTc` \ (lie_fodecls, foe_binds, foe_decls) ->
- tcSourceRules source_rules `thenNF_Tc` \ (lie_rules, more_local_rules) ->
+ traceTc (text "Tc9") `thenNF_Tc_`
+ tcSourceRules src_rule_decls `thenNF_Tc` \ (lie_rules, src_rules) ->
-- CHECK THAT main IS DEFINED WITH RIGHT TYPE, IF REQUIRED
- traceTc (text "Tc6") `thenNF_Tc_`
+ traceTc (text "Tc10") `thenNF_Tc_`
tcCheckMain this_mod `thenTc_`
-- Deal with constant or ambiguous InstIds. How could
traceTc (text "Tc8") `thenNF_Tc_`
zonkForeignExports foe_decls `thenNF_Tc` \ foe_decls' ->
traceTc (text "Tc9") `thenNF_Tc_`
- zonkRules more_local_rules `thenNF_Tc` \ more_local_rules' ->
+ zonkRules src_rules `thenNF_Tc` \ src_rules' ->
- let local_things = filter (isLocalThing this_mod) (typeEnvElts (getTcGEnv final_env))
-
- local_type_env :: TypeEnv
- local_type_env = mkTypeEnv local_things
-
- all_local_rules = local_rules ++ more_local_rules'
+ let src_things = filter (isLocalThing this_mod) (typeEnvElts (getTcGEnv final_env))
+ -- This is horribly crude; the env might be jolly big
in
traceTc (text "Tc10") `thenNF_Tc_`
returnTc (final_env,
new_pcs,
- TcResults { tc_env = local_type_env,
- tc_insts = local_inst_dfuns,
+ TcResults { tc_env = mkTypeEnv src_things,
+ tc_insts = map iDFunId inst_info,
tc_binds = all_binds',
tc_fords = foi_decls ++ foe_decls',
- tc_rules = all_local_rules
+ tc_rules = src_rules'
}
)
) `thenTc` \ (_, pcs, tc_result) ->
returnTc (pcs, tc_result)
where
- tycl_decls = [d | TyClD d <- decls]
- val_binds = foldr ThenBinds EmptyBinds [binds | ValD binds <- decls]
- source_rules = [d | RuleD d <- decls, not (isIfaceRuleDecl d)]
+ tycl_decls = [d | TyClD d <- decls]
+ rule_decls = [d | RuleD d <- decls]
+ inst_decls = [d | InstD d <- decls]
+ val_decls = [d | ValD d <- decls]
+
+ (src_inst_decls, iface_inst_decls) = partition isSourceInstDecl inst_decls
+ (src_rule_decls, iface_rule_decls) = partition (isSourceRuleDecl this_mod) rule_decls
+ val_binds = foldr ThenBinds EmptyBinds val_decls
\end{code}
typecheckIface dflags pcs hst mod_iface decls
= do { maybe_tc_stuff <- typecheck dflags pcs hst alwaysQualify $
- tcIfaceImports pcs hst get_fixity this_mod decls
+ tcIface pcs this_mod decls
; printIfaceDump dflags maybe_tc_stuff
; return maybe_tc_stuff }
where
- this_mod = mi_module mod_iface
- fixity_env = mi_fixities mod_iface
+ this_mod = mi_module mod_iface
- get_fixity :: Name -> Maybe Fixity
- get_fixity nm = lookupNameEnv fixity_env nm
+tcIface pcs this_mod decls
+-- The decls are coming from this_mod's interface file, together
+-- with imported interface decls that belong in the "package" stuff.
+-- (With GHCi, all the home modules have already been processed.)
+-- That is why we need to do the partitioning below.
+ = tcIfaceImports this_mod decls `thenTc` \ (_, all_things, dfuns, rules) ->
+
+ let
+ -- Do the partitioning (see notes above)
+ (local_things, imported_things) = partition (isLocalThing this_mod) all_things
+ (local_rules, imported_rules) = partition is_local_rule rules
+ (local_dfuns, imported_dfuns) = partition (isLocalThing this_mod) dfuns
+ is_local_rule (IfaceRuleOut n _) = isLocalThing this_mod n
+ in
+ addInstDFuns (pcs_insts pcs) imported_dfuns `thenNF_Tc` \ new_pcs_insts ->
+ let
+ new_pcs_pte :: PackageTypeEnv
+ new_pcs_pte = extendTypeEnvList (pcs_PTE pcs) imported_things
+ new_pcs_rules = addIfaceRules (pcs_rules pcs) imported_rules
+
+ new_pcs :: PersistentCompilerState
+ new_pcs = pcs { pcs_PTE = new_pcs_pte,
+ pcs_insts = new_pcs_insts,
+ pcs_rules = new_pcs_rules
+ }
- tcIfaceImports pcs hst get_fixity this_mod decls
- = fixTc (\ ~(unf_env, _, _, _, _, _) ->
- tcImports unf_env pcs hst get_fixity this_mod decls
- ) `thenTc` \ (env, new_pcs, local_inst_info, local_inst_dfuns,
- deriv_binds, local_rules) ->
- ASSERT(nullBinds deriv_binds && null local_inst_info)
- let
- local_things = filter (isLocalThing this_mod) (typeEnvElts (getTcGEnv env))
-
- mod_details = ModDetails { md_types = mkTypeEnv local_things,
- md_insts = local_inst_dfuns,
- md_rules = [(id,rule) | IfaceRuleOut id rule <- local_rules],
- md_binds = [] }
+ mod_details = ModDetails { md_types = mkTypeEnv local_things,
+ md_insts = local_dfuns,
+ md_rules = [(id,rule) | IfaceRuleOut id rule <- local_rules],
+ md_binds = [] }
-- All the rules from an interface are of the IfaceRuleOut form
- in
- returnTc (new_pcs, mod_details)
+ in
+ returnTc (new_pcs, mod_details)
+
+
+tcIfaceImports :: Module
+ -> [RenamedHsDecl] -- All interface-file decls
+ -> TcM (TcEnv, [TyThing], [DFunId], [TypecheckedRuleDecl])
+tcIfaceImports this_mod decls
+-- The decls are all interface-file declarations
+ = let
+ inst_decls = [d | InstD d <- decls]
+ tycl_decls = [d | TyClD d <- decls]
+ rule_decls = [d | RuleD d <- decls]
+ in
+ fixTc (\ ~(unf_env, _, _, _) ->
+ -- This fixTc follows the same general plan as tcImports,
+ -- which is better commented (below)
+ tcTyAndClassDecls unf_env this_mod tycl_decls `thenTc` \ tycl_things ->
+ tcExtendGlobalEnv tycl_things $
+ tcInterfaceSigs unf_env this_mod tycl_decls `thenTc` \ sig_ids ->
+ tcExtendGlobalValEnv sig_ids $
+ tcIfaceInstDecls1 inst_decls `thenTc` \ dfuns ->
+ tcIfaceRules rule_decls `thenTc` \ rules ->
+ tcGetEnv `thenTc` \ env ->
+ let
+ all_things = map AnId sig_ids ++ tycl_things
+ in
+ returnTc (env, all_things, dfuns, rules)
+ )
+
tcImports :: RecTcEnv
-> PersistentCompilerState
-> HomeSymbolTable
-> (Name -> Maybe Fixity)
-> Module
- -> [RenamedHsDecl]
- -> TcM (TcEnv, PersistentCompilerState, [InstInfo], [DFunId],
- RenamedHsBinds, [TypecheckedRuleDecl])
+ -> [RenamedTyClDecl]
+ -> [RenamedInstDecl]
+ -> [RenamedRuleDecl]
+ -> TcM (TcEnv, PersistentCompilerState)
-- tcImports is a slight mis-nomer.
-- It deals with everything that could be an import:
--- type and class decls
+-- type and class decls (some source, some imported)
-- interface signatures (checked lazily)
--- instance decls
--- rule decls
+-- instance decls (some source, some imported)
+-- rule decls (all imported)
-- These can occur in source code too, of course
+--
+-- tcImports is only called when processing source code,
+-- so that any interface-file declarations are for other modules, not this one
-tcImports unf_env pcs hst get_fixity this_mod decls
+tcImports unf_env pcs hst get_fixity this_mod
+ tycl_decls inst_decls rule_decls
-- (unf_env :: RecTcEnv) is used for type-checking interface pragmas
-- which is done lazily [ie failure just drops the pragma
-- without having any global-failure effect].
-- an error we'd better stop now, to avoid a cascade
traceTc (text "Tc1") `thenNF_Tc_`
- tcTyAndClassDecls unf_env this_mod tycl_decls `thenTc` \ env ->
- tcSetEnv env $
+ tcTyAndClassDecls unf_env this_mod tycl_decls `thenTc` \ tycl_things ->
+ tcExtendGlobalEnv tycl_things $
-- Interface type signatures
-- We tie a knot so that the Ids read out of interfaces are in scope
-- Typecheck the instance decls, includes deriving
-- Note that imported dictionary functions are already
-- in scope from the preceding tcInterfaceSigs
- traceTc (text "Tc3") `thenNF_Tc_`
- tcInstDecls1 (pcs_insts pcs) (pcs_PRS pcs) hst unf_env get_fixity this_mod decls
- `thenTc` \ (new_pcs_insts, inst_env, local_inst_info, local_inst_dfuns, deriv_binds) ->
- tcSetInstEnv inst_env $
-
- tcIfaceRules unf_env (pcs_rules pcs) this_mod iface_rules `thenNF_Tc` \ (new_pcs_rules, local_rules) ->
- -- When relinking this module from its interface-file decls
- -- we'll have IfaceRules that are in fact local to this module
- -- That's the reason we we get any local_rules out here
+ traceTc (text "Tc3") `thenNF_Tc_`
+ tcIfaceInstDecls1 inst_decls `thenTc` \ dfuns ->
+ tcIfaceRules rule_decls `thenNF_Tc` \ rules ->
- tcGetEnv `thenTc` \ unf_env ->
+ addInstDFuns (pcs_insts pcs) dfuns `thenNF_Tc` \ new_pcs_insts ->
+ tcGetEnv `thenTc` \ unf_env ->
let
- all_things = typeEnvElts (getTcGEnv unf_env)
-
-- sometimes we're compiling in the context of a package module
-- (on the GHCi command line, for example). In this case, we
-- want to treat everything we pulled in as an imported thing.
- imported_things
- = filter (not . isLocalThing this_mod) all_things
+ imported_things = map AnId sig_ids ++ -- All imported
+ filter (not . isLocalThing this_mod) tycl_things
new_pte :: PackageTypeEnv
new_pte = extendTypeEnvList (pcs_PTE pcs) imported_things
+ new_pcs_rules = addIfaceRules (pcs_rules pcs) rules
+
new_pcs :: PersistentCompilerState
new_pcs = pcs { pcs_PTE = new_pte,
pcs_insts = new_pcs_insts,
pcs_rules = new_pcs_rules
}
in
- returnTc (unf_env, new_pcs, local_inst_info, local_inst_dfuns, deriv_binds, local_rules)
+ returnTc (unf_env, new_pcs)
+
+isSourceRuleDecl :: Module -> RenamedRuleDecl -> Bool
+-- This is a bit gruesome.
+-- Usually, HsRules come only from source files; IfaceRules only from interface files
+-- But built-in rules appear as an IfaceRuleOut... and when compiling
+-- the source file for that built-in rule, we want to treat it as a source
+-- rule, so it gets put with the other rules for that module.
+isSourceRuleDecl this_mod (HsRule _ _ _ _ _ _) = True
+isSourceRuleDecl this_mod (IfaceRule _ _ _ n _ _ _) = False
+isSourceRuleDecl this_mod (IfaceRuleOut name _) = isLocalThing this_mod name
+
+addIfaceRules rule_base rules
+ = foldl add_rule rule_base rules
where
- tycl_decls = [d | TyClD d <- decls]
- iface_rules = [d | RuleD d <- decls, isIfaceRuleDecl d]
+ add_rule rule_base (IfaceRuleOut id rule) = extendRuleBase rule_base (id, rule)
\end{code}
projects / ghc-hetmet.git / blobdiff