%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[TcGenDeriv]{Generating derived instance declarations}
module TcGenDeriv (
gen_Bounded_binds,
gen_Enum_binds,
- gen_Eval_binds,
gen_Eq_binds,
gen_Ix_binds,
gen_Ord_binds,
#include "HsVersions.h"
-import HsSyn ( InPat(..), HsExpr(..), MonoBinds(..), GRHS(..),
+import HsSyn ( InPat(..), HsExpr(..), MonoBinds(..),
Match(..), GRHSsAndBinds(..), Stmt(..), HsLit(..),
- HsBinds(..), DoOrListComp(..),
+ HsBinds(..), StmtCtxt(..),
unguardedRHS
)
-import RdrHsSyn ( RdrName(..), varQual, varUnqual, mkOpApp,
+import RdrHsSyn ( RdrName(..), varUnqual, mkOpApp,
RdrNameMonoBinds, RdrNameHsExpr, RdrNamePat
)
import BasicTypes ( IfaceFlavour(..), RecFlag(..) )
import FieldLabel ( fieldLabelName )
-import Id ( GenId, isNullaryDataCon, dataConTag,
+import DataCon ( isNullaryDataCon, dataConTag,
dataConRawArgTys, fIRST_TAG,
- isDataCon, DataCon, ConTag,
- dataConFieldLabels, Id )
-import Maybes ( maybeToBool )
+ DataCon, ConTag,
+ dataConFieldLabels )
import Name ( getOccString, getOccName, getSrcLoc, occNameString,
modAndOcc, OccName, Name )
import PrimOp ( PrimOp(..) )
import PrelInfo -- Lots of RdrNames
import SrcLoc ( mkGeneratedSrcLoc, SrcLoc )
-import TyCon ( TyCon, isNewTyCon, tyConDataCons, isEnumerationTyCon, maybeTyConSingleCon )
-import Type ( isUnpointedType, isUnboxedType, Type )
+import TyCon ( TyCon, isNewTyCon, tyConDataCons, isEnumerationTyCon,
+ maybeTyConSingleCon
+ )
+import Type ( isUnLiftedType, isUnboxedType, Type )
import TysPrim ( charPrimTy, intPrimTy, wordPrimTy, addrPrimTy,
floatPrimTy, doublePrimTy
)
import Util ( mapAccumL, zipEqual, zipWithEqual,
zipWith3Equal, nOfThem, panic, assertPanic )
-
+import Maybes ( maybeToBool )
import List ( partition, intersperse )
\end{code}
produced don't get through the typechecker.
\end{itemize}
+
+deriveEq :: RdrName -- Class
+ -> RdrName -- Type constructor
+ -> [ (RdrName, [RdrType]) ] -- Constructors
+ -> (RdrContext, -- Context for the inst decl
+ [RdrBind], -- Binds in the inst decl
+ [RdrBind]) -- Extra value bindings outside
+
+deriveEq clas tycon constrs
+ = (context, [eq_bind, ne_bind], [])
+ where
+ context = [(clas, [ty]) | (_, tys) <- constrs, ty <- tys]
+
+ ne_bind = mkBind
+ (nullary_cons, non_nullary_cons) = partition is_nullary constrs
+ is_nullary (_, args) = null args
+
\begin{code}
gen_Eq_binds :: TyCon -> RdrNameMonoBinds
\end{verbatim}
\end{itemize}
-If there is only one constructor in the Data Type we don't need the WildCard Patern.
+If there is only one constructor in the Data Type we don't need the WildCard Pattern.
JJQC-30-Nov-1997
\begin{code}
-- So we need to do a less-than comparison on the tags
(cmp_tags_Expr ltH_Int_RDR ah_RDR bh_RDR ltTag_Expr gtTag_Expr)))
+ tycon_data_cons = tyConDataCons tycon
(nullary_cons, nonnullary_cons)
| isNewTyCon tycon = ([], tyConDataCons tycon)
- | otherwise = partition isNullaryDataCon (tyConDataCons tycon)
-
- cmp_eq
- = mk_FunMonoBind tycon_loc cmp_eq_RDR (map pats_etc nonnullary_cons ++
- if ((length nonnullary_cons + length nullary_cons) == 1)
- then []
- else [([WildPatIn, WildPatIn],
- default_rhs)])
+ | otherwise = partition isNullaryDataCon tycon_data_cons
+
+ cmp_eq =
+ mk_FunMonoBind tycon_loc
+ cmp_eq_RDR
+ (if null nonnullary_cons && (length nullary_cons == 1) then
+ -- catch this specially to avoid warnings
+ -- about overlapping patterns from the desugarer.
+ let
+ data_con = head nullary_cons
+ data_con_RDR = qual_orig_name data_con
+ pat = ConPatIn data_con_RDR []
+ in
+ [([pat,pat], eqTag_Expr)]
+ else
+ map pats_etc nonnullary_cons ++
+ -- leave out wildcards to silence desugarer.
+ (if length tycon_data_cons == 1 then
+ []
+ else
+ [([WildPatIn, WildPatIn], default_rhs)]))
where
pats_etc data_con
= ([con1_pat, con2_pat],
%************************************************************************
%* *
-\subsubsection{Generating @Eval@ instance declarations}
-%* *
-%************************************************************************
-
-\begin{code}
-gen_Eval_binds tycon = EmptyMonoBinds
-\end{code}
-
-%************************************************************************
-%* *
\subsubsection{Generating @Bounded@ instance declarations}
%* *
%************************************************************************
enum_index `AndMonoBinds` enum_inRange
enum_range
- = mk_easy_FunMonoBind tycon_loc range_RDR [TuplePatIn [a_Pat, b_Pat]] [] $
+ = mk_easy_FunMonoBind tycon_loc range_RDR
+ [TuplePatIn [a_Pat, b_Pat] True{-boxed-}] [] $
untag_Expr tycon [(a_RDR, ah_RDR)] $
untag_Expr tycon [(b_RDR, bh_RDR)] $
HsApp (mk_easy_App map_RDR [tag2con_RDR tycon]) $
(mk_easy_App mkInt_RDR [bh_RDR]))
enum_index
- = mk_easy_FunMonoBind tycon_loc index_RDR [AsPatIn c_RDR (TuplePatIn [a_Pat, b_Pat]), d_Pat] [] (
+ = mk_easy_FunMonoBind tycon_loc index_RDR
+ [AsPatIn c_RDR (TuplePatIn [a_Pat, b_Pat] True{-boxed-}),
+ d_Pat] [] (
HsIf (HsPar (mk_easy_App inRange_RDR [c_RDR, d_RDR])) (
untag_Expr tycon [(a_RDR, ah_RDR)] (
untag_Expr tycon [(d_RDR, dh_RDR)] (
tycon_loc)
enum_inRange
- = mk_easy_FunMonoBind tycon_loc inRange_RDR [TuplePatIn [a_Pat, b_Pat], c_Pat] [] (
+ = mk_easy_FunMonoBind tycon_loc inRange_RDR
+ [TuplePatIn [a_Pat, b_Pat] True{-boxed-}, c_Pat] [] (
untag_Expr tycon [(a_RDR, ah_RDR)] (
untag_Expr tycon [(b_RDR, bh_RDR)] (
untag_Expr tycon [(c_RDR, ch_RDR)] (
data_con
= case maybeTyConSingleCon tycon of -- just checking...
Nothing -> panic "get_Ix_binds"
- Just dc -> if (any isUnpointedType (dataConRawArgTys dc)) then
+ Just dc -> if (any isUnLiftedType (dataConRawArgTys dc)) then
error ("ERROR: Can't derive Ix for a single-constructor type with primitive argument types: "++tycon_str)
else
dc
--------------------------------------------------------------
single_con_range
- = mk_easy_FunMonoBind tycon_loc range_RDR [TuplePatIn [con_pat as_needed, con_pat bs_needed]] [] $
+ = mk_easy_FunMonoBind tycon_loc range_RDR
+ [TuplePatIn [con_pat as_needed, con_pat bs_needed] True{-boxed-}] [] $
HsDo ListComp stmts tycon_loc
where
stmts = zipWith3Equal "single_con_range" mk_qual as_needed bs_needed cs_needed
[ReturnStmt con_expr]
mk_qual a b c = BindStmt (VarPatIn c)
- (HsApp (HsVar range_RDR) (ExplicitTuple [HsVar a, HsVar b]))
+ (HsApp (HsVar range_RDR)
+ (ExplicitTuple [HsVar a, HsVar b] True))
tycon_loc
----------------
single_con_index
- = mk_easy_FunMonoBind tycon_loc index_RDR [TuplePatIn [con_pat as_needed, con_pat bs_needed], con_pat cs_needed] [range_size] (
+ = mk_easy_FunMonoBind tycon_loc index_RDR
+ [TuplePatIn [con_pat as_needed, con_pat bs_needed] True,
+ con_pat cs_needed] [range_size] (
foldl mk_index (HsLit (HsInt 0)) (zip3 as_needed bs_needed cs_needed))
where
mk_index multiply_by (l, u, i)
= genOpApp (
- (HsApp (HsApp (HsVar index_RDR) (ExplicitTuple [HsVar l, HsVar u])) (HsVar i))
+ (HsApp (HsApp (HsVar index_RDR)
+ (ExplicitTuple [HsVar l, HsVar u] True)) (HsVar i))
) plus_RDR (
genOpApp (
- (HsApp (HsVar rangeSize_RDR) (ExplicitTuple [HsVar l, HsVar u]))
+ (HsApp (HsVar rangeSize_RDR)
+ (ExplicitTuple [HsVar l, HsVar u] True))
) times_RDR multiply_by
)
range_size
- = mk_easy_FunMonoBind tycon_loc rangeSize_RDR [TuplePatIn [a_Pat, b_Pat]] [] (
+ = mk_easy_FunMonoBind tycon_loc rangeSize_RDR
+ [TuplePatIn [a_Pat, b_Pat] True] [] (
genOpApp (
- (HsApp (HsApp (HsVar index_RDR) (ExplicitTuple [a_Expr, b_Expr])) b_Expr)
+ (HsApp (HsApp (HsVar index_RDR)
+ (ExplicitTuple [a_Expr, b_Expr] True)) b_Expr)
) plus_RDR (HsLit (HsInt 1)))
------------------
single_con_inRange
= mk_easy_FunMonoBind tycon_loc inRange_RDR
- [TuplePatIn [con_pat as_needed, con_pat bs_needed], con_pat cs_needed]
+ [TuplePatIn [con_pat as_needed, con_pat bs_needed] True,
+ con_pat cs_needed]
[] (
foldl1 and_Expr (zipWith3Equal "single_con_inRange" in_range as_needed bs_needed cs_needed))
where
- in_range a b c = HsApp (HsApp (HsVar inRange_RDR) (ExplicitTuple [HsVar a, HsVar b])) (HsVar c)
+ in_range a b c = HsApp (HsApp (HsVar inRange_RDR)
+ (ExplicitTuple [HsVar a, HsVar b] True))
+ (HsVar c)
\end{code}
%************************************************************************
-- (label, '=' and field)*n, (n-1)*',' + '{' + '}'
con_qual
= BindStmt
- (TuplePatIn [LitPatIn (HsString data_con_str), d_Pat])
+ (TuplePatIn [LitPatIn (HsString data_con_str),
+ d_Pat] True)
(HsApp (HsVar lex_RDR) c_Expr)
tycon_loc
str_qual str res draw_from
= BindStmt
- (TuplePatIn [LitPatIn (HsString str), VarPatIn res])
+ (TuplePatIn [LitPatIn (HsString str), VarPatIn res] True)
(HsApp (HsVar lex_RDR) draw_from)
tycon_loc
mk_read_qual con_field res draw_from =
BindStmt
- (TuplePatIn [VarPatIn con_field, VarPatIn res])
+ (TuplePatIn [VarPatIn con_field, VarPatIn res] True)
(HsApp (HsApp (HsVar readsPrec_RDR) (HsLit (HsInt 10))) draw_from)
tycon_loc
result_expr = ExplicitTuple [con_expr, if null bs_needed
then d_Expr
- else HsVar (last bs_needed)]
+ else HsVar (last bs_needed)] True
stmts = con_qual:field_quals ++ [ReturnStmt result_expr]
| otherwise = --Assumption: no of fields == no of labelled fields
-- (and in same order)
concat $
- intersperse ([mk_showString_app (_CONS_ ',' _NIL_ )]) $ -- Using SLIT() is not cool here.
+ intersperse ([mk_showString_app (_CONS_ ',' _NIL_)]) $ -- Using SLIT()s containing ,s spells trouble.
zipWithEqual "gen_Show_binds"
(\ a b -> [a,b])
(map show_label labels)
mk_stuff :: DataCon -> ([RdrNamePat], RdrNameHsExpr)
mk_stuff var
- = ASSERT(isDataCon var)
- ([pat], HsLit (HsIntPrim (toInteger ((dataConTag var) - fIRST_TAG))))
+ = ([pat], HsLit (HsIntPrim (toInteger ((dataConTag var) - fIRST_TAG))))
where
pat = ConPatIn var_RDR (nOfThem (argFieldCount var) WildPatIn)
var_RDR = qual_orig_name var
[([WildPatIn], impossible_Expr)])
where
mk_stuff :: DataCon -> ([RdrNamePat], RdrNameHsExpr)
-
- mk_stuff var
- = ASSERT(isDataCon var)
- ([lit_pat], HsVar var_RDR)
+ mk_stuff var = ([lit_pat], HsVar var_RDR)
where
lit_pat = ConPatIn mkInt_RDR [LitPatIn (HsIntPrim (toInteger ((dataConTag var) - fIRST_TAG)))]
var_RDR = qual_orig_name var
\end{code}
\begin{code}
-argFieldCount :: Id -> Int -- Works on data and newtype constructors
+argFieldCount :: DataCon -> Int -- Works on data and newtype constructors
argFieldCount con = length (dataConRawArgTys con)
\end{code}
projects / ghc-hetmet.git / blobdiff