map tag2con_Foo (enumFromTo (I# a#) (I# b#))
}}
- index c@(a, b) d
- = if inRange c d
- then case (con2tag_Foo d -# con2tag_Foo a) of
+ -- Generate code for unsafeIndex, becuase using index leads
+ -- to lots of redundant range tests
+ unsafeIndex c@(a, b) d
+ = case (con2tag_Foo d -# con2tag_Foo a) of
r# -> I# r#
- else error "Ix.Foo.index: out of range"
inRange (a, b) c
= let
then enum_ixes
else single_con_ixes
where
- tycon_str = getOccString tycon
tycon_loc = getSrcSpan tycon
--------------------------------------------------------------
(nlHsVarApps intDataCon_RDR [bh_RDR]))
enum_index
- = mk_easy_FunBind tycon_loc index_RDR
+ = mk_easy_FunBind tycon_loc unsafeIndex_RDR
[noLoc (AsPat (noLoc c_RDR)
(nlTuplePat [a_Pat, nlWildPat] Boxed)),
d_Pat] emptyLHsBinds (
- nlHsIf (nlHsPar (nlHsVarApps inRange_RDR [c_RDR, d_RDR])) (
untag_Expr tycon [(a_RDR, ah_RDR)] (
untag_Expr tycon [(d_RDR, dh_RDR)] (
let
(genOpApp (nlHsVar dh_RDR) minusInt_RDR (nlHsVar ah_RDR))
[mkSimpleHsAlt (nlVarPat c_RDR) rhs]
))
- ) {-else-} (
- nlHsApp (nlHsVar error_RDR) (nlHsLit (HsString (mkFastString ("Ix."++tycon_str++".index: out of range\n"))))
- ))
+ )
enum_inRange
= mk_easy_FunBind tycon_loc inRange_RDR
single_con_range
= mk_easy_FunBind tycon_loc range_RDR
[nlTuplePat [con_pat as_needed, con_pat bs_needed] Boxed] emptyLHsBinds $
- nlHsDo ListComp stmts
+ nlHsDo ListComp stmts con_expr
where
stmts = zipWith3Equal "single_con_range" mk_qual as_needed bs_needed cs_needed
- ++
- [nlResultStmt con_expr]
- mk_qual a b c = nlBindStmt (nlVarPat c)
+ mk_qual a b c = noLoc $ mkBindStmt (nlVarPat c)
(nlHsApp (nlHsVar range_RDR)
(nlTuple [nlHsVar a, nlHsVar b] Boxed))
----------------
single_con_index
- = mk_easy_FunBind tycon_loc index_RDR
+ = mk_easy_FunBind tycon_loc unsafeIndex_RDR
[nlTuplePat [con_pat as_needed, con_pat bs_needed] Boxed,
- con_pat cs_needed] (unitBag range_size) (
- foldl mk_index (nlHsIntLit 0) (zip3 as_needed bs_needed cs_needed))
+ con_pat cs_needed] emptyBag
+ (mk_index (zip3 as_needed bs_needed cs_needed))
where
- mk_index multiply_by (l, u, i)
+ -- index (l1,u1) i1 + rangeSize (l1,u1) * (index (l2,u2) i2 + ...)
+ mk_index [] = nlHsIntLit 0
+ mk_index [(l,u,i)] = mk_one l u i
+ mk_index ((l,u,i) : rest)
= genOpApp (
- (nlHsApps index_RDR [nlTuple [nlHsVar l, nlHsVar u] Boxed,
- nlHsVar i])
- ) plus_RDR (
+ mk_one l u i
+ ) plus_RDR (
genOpApp (
- (nlHsApp (nlHsVar rangeSize_RDR)
+ (nlHsApp (nlHsVar unsafeRangeSize_RDR)
(nlTuple [nlHsVar l, nlHsVar u] Boxed))
- ) times_RDR multiply_by
+ ) times_RDR (mk_index rest)
)
-
- range_size
- = mk_easy_FunBind tycon_loc rangeSize_RDR
- [nlTuplePat [a_Pat, b_Pat] Boxed] emptyLHsBinds (
- genOpApp (
- (nlHsApps index_RDR [nlTuple [a_Expr, b_Expr] Boxed,
- b_Expr])
- ) plus_RDR (nlHsIntLit 1))
+ mk_one l u i
+ = nlHsApps unsafeIndex_RDR [nlTuple [nlHsVar l, nlHsVar u] Boxed, nlHsVar i]
------------------
single_con_inRange
read_nullary_cons
= case nullary_cons of
[] -> []
- [con] -> [nlHsDo DoExpr [bindLex (ident_pat (data_con_str con)),
- result_stmt con []]]
+ [con] -> [nlHsDo DoExpr [bindLex (ident_pat (data_con_str con))]
+ (result_expr con [])]
_ -> [nlHsApp (nlHsVar choose_RDR)
(nlList (map mk_pair nullary_cons))]
Boxed
read_non_nullary_con data_con
- = nlHsApps prec_RDR [nlHsIntLit prec, nlHsDo DoExpr stmts]
+ = nlHsApps prec_RDR [nlHsIntLit prec, nlHsDo DoExpr stmts body]
where
stmts | is_infix = infix_stmts
| length labels > 0 = lbl_stmts
| otherwise = prefix_stmts
+ body = result_expr data_con as_needed
+
prefix_stmts -- T a b c
= [bindLex (ident_pat (data_con_str_w_parens data_con))]
++ read_args
- ++ [result_stmt data_con as_needed]
infix_stmts -- a %% b
= [read_a1,
bindLex (symbol_pat (data_con_str data_con)),
- read_a2,
- result_stmt data_con [a1,a2]]
+ read_a2]
lbl_stmts -- T { f1 = a, f2 = b }
= [bindLex (ident_pat (data_con_str_w_parens data_con)),
read_punc "{"]
++ concat (intersperse [read_punc ","] field_stmts)
- ++ [read_punc "}", result_stmt data_con as_needed]
+ ++ [read_punc "}"]
field_stmts = zipWithEqual "lbl_stmts" read_field labels as_needed
as_needed = take con_arity as_RDRs
read_args = zipWithEqual "gen_Read_binds" read_arg as_needed (dataConOrigArgTys data_con)
(read_a1:read_a2:_) = read_args
- (a1:a2:_) = as_needed
prec = getPrec is_infix get_fixity dc_nm
------------------------------------------------------------------------
-- Helpers
------------------------------------------------------------------------
mk_alt e1 e2 = genOpApp e1 alt_RDR e2
- bindLex pat = nlBindStmt pat (nlHsVar lexP_RDR)
- result_stmt c as = nlResultStmt (nlHsApp (nlHsVar returnM_RDR) (con_app c as))
+ bindLex pat = noLoc (mkBindStmt pat (nlHsVar lexP_RDR))
con_app c as = nlHsVarApps (getRdrName c) as
+ result_expr c as = nlHsApp (nlHsVar returnM_RDR) (con_app c as)
punc_pat s = nlConPat punc_RDR [nlLitPat (mkHsString s)] -- Punc 'c'
ident_pat s = nlConPat ident_RDR [nlLitPat s] -- Ident "foo"
read_punc c = bindLex (punc_pat c)
read_arg a ty
| isUnLiftedType ty = pprPanic "Error in deriving:" (text "Can't read unlifted types yet:" <+> ppr ty)
- | otherwise = nlBindStmt (nlVarPat a) (nlHsVarApps step_RDR [readPrec_RDR])
+ | otherwise = noLoc (mkBindStmt (nlVarPat a) (nlHsVarApps step_RDR [readPrec_RDR]))
read_field lbl a = read_lbl lbl ++
[read_punc "=",
- nlBindStmt (nlVarPat a) (nlHsVarApps reset_RDR [readPrec_RDR])]
+ noLoc (mkBindStmt (nlVarPat a) (nlHsVarApps reset_RDR [readPrec_RDR]))]
-- When reading field labels we might encounter
-- a = 3
ch_RDR = mkVarUnqual FSLIT("c#")
dh_RDR = mkVarUnqual FSLIT("d#")
cmp_eq_RDR = mkVarUnqual FSLIT("cmp_eq")
-rangeSize_RDR = mkVarUnqual FSLIT("rangeSize")
as_RDRs = [ mkVarUnqual (mkFastString ("a"++show i)) | i <- [(1::Int) .. ] ]
bs_RDRs = [ mkVarUnqual (mkFastString ("b"++show i)) | i <- [(1::Int) .. ] ]
projects / ghc-hetmet.git / blobdiff