\section[TcRules]{Typechecking transformation rules}
\begin{code}
-module TcRules ( tcRules ) where
+module TcRules ( tcIfaceRules, tcSourceRules ) where
#include "HsVersions.h"
-import HsSyn ( HsDecl(..), RuleDecl(..), RuleBndr(..) )
+import HsSyn ( RuleDecl(..), RuleBndr(..) )
import CoreSyn ( CoreRule(..) )
-import RnHsSyn ( RenamedHsDecl, RenamedRuleDecl )
-import HscTypes ( PackageRuleEnv )
+import RnHsSyn ( RenamedRuleDecl )
+import HscTypes ( PackageRuleBase )
import TcHsSyn ( TypecheckedRuleDecl, mkHsLet )
import TcMonad
import TcSimplify ( tcSimplifyToDicts, tcSimplifyAndCheck )
import TcIfaceSig ( tcCoreExpr, tcCoreLamBndrs, tcVar )
import TcMonoType ( kcHsSigType, tcHsSigType, tcTyVars, checkSigTyVars )
import TcExpr ( tcExpr )
-import TcEnv ( tcExtendLocalValEnv, tcExtendTyVarEnv )
+import TcEnv ( tcExtendLocalValEnv, tcExtendTyVarEnv, isLocalThing )
import Rules ( extendRuleBase )
import Inst ( LIE, plusLIEs, instToId )
import Id ( idType, idName, mkVanillaId )
-import Name ( Name, extendNameEnvList )
+import Module ( Module )
import VarSet
import Type ( tyVarsOfTypes, openTypeKind )
import Bag ( bagToList )
\end{code}
\begin{code}
-tcRules :: PackageRuleEnv -> [RenamedHsDecl] -> TcM (PackageRuleEnv, LIE, [TypecheckedRuleDecl])
-tcRules pkg_rule_env decls
- = mapAndUnzipTc tcLocalRule local_rules `thenTc` \ (lies, new_local_rules) ->
- mapTc tcIfaceRule imported_rules `thenTc` \ new_imported_rules ->
- returnTc (extendRuleBaseList pkg_rule_env new_imported_rules,
- plusLIEs lies, new_local_rules)
+tcIfaceRules :: PackageRuleBase -> Module -> [RenamedRuleDecl]
+ -> TcM (PackageRuleBase, [TypecheckedRuleDecl])
+tcIfaceRules pkg_rule_base mod decls
+ = mapTc tcIfaceRule decls `thenTc` \ new_rules ->
+ let
+ (local_rules, imported_rules) = partition is_local new_rules
+ new_rule_base = foldl add pkg_rule_base imported_rules
+ in
+ returnTc (new_rule_base, local_rules)
where
- rule_decls = [rule | RuleD rule <- decls]
- (imported_rules, local_rules) = partition is_iface_rule rule_decls
+ add rule_base (IfaceRuleOut id rule) = extendRuleBase rule_base (id, rule)
- is_iface_rule (IfaceRule _ _ _ _ _ _) = True
- is_iface_rule other = False
+ -- When relinking this module from its interface-file decls
+ -- we'll have IfaceRules that are in fact local to this module
+ is_local (IfaceRuleOut n _) = isLocalThing mod n
+ is_local other = True
-tcIfaceRule :: RenamedRuleDecl -> TcM (Id, CoreRule)
+tcIfaceRule :: RenamedRuleDecl -> TcM TypecheckedRuleDecl
-- No zonking necessary!
tcIfaceRule (IfaceRule name vars fun args rhs src_loc)
= tcAddSrcLoc src_loc $
tcCoreLamBndrs vars $ \ vars' ->
mapTc tcCoreExpr args `thenTc` \ args' ->
tcCoreExpr rhs `thenTc` \ rhs' ->
- returnTc (fun', Rule name vars' args' rhs')
+ returnTc (IfaceRuleOut fun' (Rule name vars' args' rhs'))
+
+
+tcSourceRules :: [RenamedRuleDecl] -> TcM (LIE, [TypecheckedRuleDecl])
+tcSourceRules decls
+ = mapAndUnzipTc tcSourceRule decls `thenTc` \ (lies, decls') ->
+ returnTc (plusLIEs lies, decls')
-tcLocalRule :: RenamedRuleDecl -> TcM (LIE, TypecheckedRuleDecl)
-tcLocalRule (HsRule name sig_tvs vars lhs rhs src_loc)
+tcSourceRule (HsRule name sig_tvs vars lhs rhs src_loc)
= tcAddSrcLoc src_loc $
tcAddErrCtxt (ruleCtxt name) $
newTyVarTy openTypeKind `thenNF_Tc` \ rule_ty ->