-- modules imported from other packages.
imp_orphs :: [Module],
- -- Orphan modules below us in the import tree
+ -- Orphan modules below us in the import tree (and maybe
+ -- including us for imported modules)
+
+ imp_finsts :: [Module],
+ -- Family instance modules below us in the import tree (and
+ -- maybe including us for imported modules)
imp_parent :: NameEnv AvailInfo
-- for the names in scope in this module, tells us
imp_dep_mods = emptyUFM,
imp_dep_pkgs = [],
imp_orphs = [],
+ imp_finsts = [],
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_parent = parent1 })
+ imp_orphs = orphs1, imp_finsts = finsts1,
+ imp_parent = parent1 })
(ImportAvails { imp_env = env2, imp_mods = mods2,
imp_dep_mods = dmods2, imp_dep_pkgs = dpkgs2,
- imp_orphs = orphs2, imp_parent = parent2 })
+ imp_orphs = orphs2, imp_finsts = finsts2,
+ 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_finsts = finsts1 `unionLists` finsts2,
imp_parent = plusNameEnv_C plus_avails parent1 parent2 }
where
plus_avails (AvailTC tc subs1) (AvailTC _ subs2)
\begin{code}
data Inst
- = Dict
- Name
- TcPredType
- InstLoc
-
- | Method
- Id
-
- TcId -- The overloaded function
- -- This function will be a global, local, or ClassOpId;
- -- inside instance decls (only) it can also be an InstId!
- -- The id needn't be completely polymorphic.
- -- You'll probably find its name (for documentation purposes)
- -- inside the InstOrigin
-
- [TcType] -- The types to which its polymorphic tyvars
- -- should be instantiated.
- -- These types must saturate the Id's foralls.
-
- TcThetaType -- The (types of the) dictionaries to which the function
- -- must be applied to get the method
+ = Dict {
+ tci_name :: Name,
+ tci_pred :: TcPredType,
+ tci_loc :: InstLoc
+ }
+
+ | Method {
+ tci_id :: TcId, -- The Id for the Inst
+
+ tci_oid :: TcId, -- The overloaded function
+ -- This function will be a global, local, or ClassOpId;
+ -- inside instance decls (only) it can also be an InstId!
+ -- The id needn't be completely polymorphic.
+ -- You'll probably find its name (for documentation purposes)
+ -- inside the InstOrigin
- InstLoc
+ tci_tys :: [TcType], -- The types to which its polymorphic tyvars
+ -- should be instantiated.
+ -- These types must saturate the Id's foralls.
- -- INVARIANT 1: in (Method u f tys theta tau loc)
- -- type of (f tys dicts(from theta)) = tau
+ tci_theta :: TcThetaType,
+ -- The (types of the) dictionaries to which the function
+ -- must be applied to get the method
+
+ tci_loc :: InstLoc
+ }
+ -- INVARIANT 1: in (Method m f tys theta tau loc)
+ -- type of m = type of (f tys dicts(from theta))
- -- INVARIANT 2: tau must not be of form (Pred -> Tau)
+ -- INVARIANT 2: type of m must not be of form (Pred -> Tau)
-- 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
- Name
- (HsOverLit Name) -- The literal from the occurrence site
- -- INVARIANT: never a rebindable-syntax literal
- -- Reason: tcSyntaxName does unification, and we
- -- don't want to deal with that during tcSimplify,
- -- when resolving LitInsts
- TcType -- The type at which the literal is used
- InstLoc
+ | LitInst {
+ tci_name :: Name,
+ tci_lit :: HsOverLit Name, -- The literal from the occurrence site
+ -- INVARIANT: never a rebindable-syntax literal
+ -- Reason: tcSyntaxName does unification, and we
+ -- don't want to deal with that during tcSimplify,
+ -- when resolving LitInsts
+
+ tci_ty :: TcType, -- The type at which the literal is used
+ tci_loc :: InstLoc
+ }
\end{code}
@Insts@ are ordered by their class/type info, rather than by their
EQ -> True
other -> False
-cmpInst (Dict _ pred1 _) (Dict _ pred2 _) = pred1 `tcCmpPred` pred2
-cmpInst (Dict _ _ _) other = LT
+cmpInst d1@(Dict {}) d2@(Dict {}) = tci_pred d1 `tcCmpPred` tci_pred d2
+cmpInst (Dict {}) other = LT
-cmpInst (Method _ _ _ _ _) (Dict _ _ _) = GT
-cmpInst (Method _ id1 tys1 _ _) (Method _ id2 tys2 _ _) = (id1 `compare` id2) `thenCmp` (tys1 `tcCmpTypes` tys2)
-cmpInst (Method _ _ _ _ _) other = LT
+cmpInst (Method {}) (Dict {}) = GT
+cmpInst m1@(Method {}) m2@(Method {}) = (tci_oid m1 `compare` tci_oid m2) `thenCmp`
+ (tci_tys m1 `tcCmpTypes` tci_tys m2)
+cmpInst (Method {}) other = LT
-cmpInst (LitInst _ _ _ _) (Dict _ _ _) = GT
-cmpInst (LitInst _ _ _ _) (Method _ _ _ _ _) = GT
-cmpInst (LitInst _ lit1 ty1 _) (LitInst _ lit2 ty2 _) = (lit1 `compare` lit2) `thenCmp` (ty1 `tcCmpType` ty2)
+cmpInst (LitInst {}) (Dict {}) = GT
+cmpInst (LitInst {}) (Method {}) = GT
+cmpInst l1@(LitInst {}) l2@(LitInst {}) = (tci_lit l1 `compare` tci_lit l2) `thenCmp`
+ (tci_ty l1 `tcCmpType` tci_ty l2)
\end{code}
projects / ghc-hetmet.git / blobdiff