%
+% (c) The University of Glasgow 2006
% (c) The AQUA Project, Glasgow University, 1996-1998
%
-%************************************************************************
-%* *
-\section[PprCore]{Printing of Core syntax, including for interfaces}
-%* *
-%************************************************************************
+
+Printing of Core syntax
\begin{code}
module PprCore (
pprRules
) where
-#include "HsVersions.h"
-
import CoreSyn
-import CostCentre ( pprCostCentreCore )
-import Var ( Var )
-import Id ( Id, idType, isDataConWorkId_maybe, idArity,
- idInfo, globalIdDetails, isGlobalId, isExportedId
- )
-import Var ( TyVar, isTyVar, tyVarKind )
-import IdInfo ( IdInfo, megaSeqIdInfo,
- inlinePragInfo, occInfo, newDemandInfo,
- lbvarInfo, hasNoLBVarInfo,
- arityInfo, ppArityInfo,
- specInfo, pprNewStrictness,
- workerInfo, ppWorkerInfo,
- newStrictnessInfo, cafInfo, ppCafInfo, specInfoRules
- )
-import NewDemand ( isTop )
-#ifdef OLD_STRICTNESS
-import Id ( idDemandInfo )
-import IdInfo ( cprInfo, ppCprInfo, strictnessInfo, ppStrictnessInfo )
-#endif
-
-import DataCon ( dataConTyCon )
-import TyCon ( tupleTyConBoxity, isTupleTyCon )
-import Type ( pprParendType, pprType, pprParendKind )
-import BasicTypes ( tupleParens, isNoOcc, isAlwaysActive )
-import Util ( lengthIs )
+import CostCentre
+import Var
+import Id
+import IdInfo
+import Demand
+import DataCon
+import TyCon
+import Type
+import Coercion
+import StaticFlags
+import BasicTypes
+import Util
import Outputable
-import FastString ( mkFastString )
+import FastString
+import Data.Maybe
\end{code}
%************************************************************************
%************************************************************************
\begin{code}
+pprTopBinds :: OutputableBndr a => [Bind a] -> SDoc
pprTopBinds binds = vcat (map pprTopBind binds)
+pprTopBind :: OutputableBndr a => Bind a -> SDoc
pprTopBind (NonRec binder expr)
- = ppr_binding (binder,expr) $$ text ""
-
-pprTopBind (Rec binds)
- = vcat [ptext SLIT("Rec {"),
- vcat (map ppr_binding binds),
- ptext SLIT("end Rec }"),
- text ""]
+ = ppr_binding (binder,expr) $$ blankLine
+
+pprTopBind (Rec [])
+ = ptext (sLit "Rec { }")
+pprTopBind (Rec (b:bs))
+ = vcat [ptext (sLit "Rec {"),
+ ppr_binding b,
+ vcat [blankLine $$ ppr_binding b | b <- bs],
+ ptext (sLit "end Rec }"),
+ blankLine]
\end{code}
\begin{code}
-- The function adds parens in context that need
-- an atomic value (e.g. function args)
-ppr_expr add_par (Type ty) = add_par (ptext SLIT("TYPE") <+> ppr ty) -- Wierd
+ppr_expr add_par (Type ty) = add_par (ptext (sLit "TYPE") <+> ppr ty) -- Wierd
-ppr_expr add_par (Var name) = ppr name
-ppr_expr add_par (Lit lit) = ppr lit
+ppr_expr _ (Var name) = ppr name
+ppr_expr _ (Lit lit) = ppr lit
+
+ppr_expr add_par (Cast expr co)
+ = add_par $
+ sep [pprParendExpr expr,
+ ptext (sLit "`cast`") <+> pprCo co]
+ where
+ pprCo co | opt_SuppressCoercions = ptext (sLit "...")
+ | otherwise = parens
+ $ sep [ppr co, dcolon <+> pprEqPred (coercionKind co)]
+
ppr_expr add_par expr@(Lam _ _)
= let
(bndrs, body) = collectBinders expr
in
add_par $
- hang (ptext SLIT("\\") <+> sep (map (pprBndr LambdaBind) bndrs) <+> arrow)
+ hang (ptext (sLit "\\") <+> sep (map (pprBndr LambdaBind) bndrs) <+> arrow)
2 (pprCoreExpr body)
-ppr_expr add_par expr@(App fun arg)
+ppr_expr add_par expr@(App {})
= case collectArgs expr of { (fun, args) ->
let
pp_args = sep (map pprArg args)
val_args = dropWhile isTypeArg args -- Drop the type arguments for tuples
- pp_tup_args = sep (punctuate comma (map pprArg val_args))
+ pp_tup_args = sep (punctuate comma (map pprCoreExpr val_args))
in
case fun of
Var f -> case isDataConWorkId_maybe f of
tc = dataConTyCon dc
saturated = val_args `lengthIs` idArity f
- other -> add_par (hang (ppr f) 2 pp_args)
+ _ -> add_par (hang (ppr f) 2 pp_args)
- other -> add_par (hang (pprParendExpr fun) 2 pp_args)
+ _ -> add_par (hang (pprParendExpr fun) 2 pp_args)
}
ppr_expr add_par (Case expr var ty [(con,args,rhs)])
= add_par $
- sep [sep [ptext SLIT("case") <+> pprCoreExpr expr,
+ sep [sep [ptext (sLit "case") <+> pprCoreExpr expr,
ifPprDebug (braces (ppr ty)),
- hsep [ptext SLIT("of"),
- ppr_bndr var,
- char '{',
- ppr_case_pat con args
- ]],
+ sep [ptext (sLit "of") <+> ppr_bndr var,
+ char '{' <+> ppr_case_pat con args]
+ ],
pprCoreExpr rhs,
char '}'
]
ppr_expr add_par (Case expr var ty alts)
= add_par $
- sep [sep [ptext SLIT("case")
+ sep [sep [ptext (sLit "case")
<+> pprCoreExpr expr
<+> ifPprDebug (braces (ppr ty)),
- ptext SLIT("of") <+> ppr_bndr var <+> char '{'],
+ ptext (sLit "of") <+> ppr_bndr var <+> char '{'],
nest 2 (sep (punctuate semi (map pprCoreAlt alts))),
char '}'
]
ppr_expr add_par (Let bind@(NonRec val_bdr rhs@(Let _ _)) body)
= add_par $
vcat [
- hsep [ptext SLIT("let {"), (pprBndr LetBind val_bdr $$ ppr val_bndr), equals],
+ hsep [ptext (sLit "let {"), (pprBndr LetBind val_bdr $$ ppr val_bndr), equals],
nest 2 (pprCoreExpr rhs),
- ptext SLIT("} in"),
+ ptext (sLit "} in"),
pprCoreExpr body ]
--}
ppr_expr add_par (Let bind@(NonRec val_bdr rhs) expr@(Let _ _))
= add_par
- (hang (ptext SLIT("let {"))
+ (hang (ptext (sLit "let {"))
2 (hsep [ppr_binding (val_bdr,rhs),
- ptext SLIT("} in")])
+ ptext (sLit "} in")])
$$
pprCoreExpr expr)
+-}
--- general case (recursive case, too)
+-- General case (recursive case, too)
ppr_expr add_par (Let bind expr)
= add_par $
- sep [hang (ptext keyword) 2 (ppr_bind bind),
- hang (ptext SLIT("} in ")) 2 (pprCoreExpr expr)]
+ sep [hang (ptext keyword) 2 (ppr_bind bind <+> ptext (sLit "} in")),
+ pprCoreExpr expr]
where
keyword = case bind of
- Rec _ -> SLIT("__letrec {")
- NonRec _ _ -> SLIT("let {")
+ Rec _ -> (sLit "letrec {")
+ NonRec _ _ -> (sLit "let {")
ppr_expr add_par (Note (SCC cc) expr)
= add_par (sep [pprCostCentreCore cc, pprCoreExpr expr])
-#ifdef DEBUG
-ppr_expr add_par (Note (Coerce to_ty from_ty) expr)
- = add_par $
- getPprStyle $ \ sty ->
- if debugStyle sty then
- sep [ptext SLIT("__coerce") <+>
- sep [pprParendType to_ty, pprParendType from_ty],
- pprParendExpr expr]
- else
- sep [hsep [ptext SLIT("__coerce"), pprParendType to_ty],
- pprParendExpr expr]
-#else
-ppr_expr add_par (Note (Coerce to_ty from_ty) expr)
- = add_par $
- sep [sep [ptext SLIT("__coerce"), nest 2 (pprParendType to_ty)],
- pprParendExpr expr]
-#endif
-
-ppr_expr add_par (Note InlineCall expr)
- = add_par (ptext SLIT("__inline_call") <+> pprParendExpr expr)
-
-ppr_expr add_par (Note InlineMe expr)
- = add_par $ ptext SLIT("__inline_me") <+> pprParendExpr expr
-
ppr_expr add_par (Note (CoreNote s) expr)
= add_par $
- sep [sep [ptext SLIT("__core_note"), pprHsString (mkFastString s)],
+ sep [sep [ptext (sLit "__core_note"), pprHsString (mkFastString s)],
pprParendExpr expr]
+pprCoreAlt :: OutputableBndr a => (AltCon, [a] , Expr a) -> SDoc
pprCoreAlt (con, args, rhs)
= hang (ppr_case_pat con args) 2 (pprCoreExpr rhs)
-ppr_case_pat con@(DataAlt dc) args
+ppr_case_pat :: OutputableBndr a => AltCon -> [a] -> SDoc
+ppr_case_pat (DataAlt dc) args
| isTupleTyCon tc
= tupleParens (tupleTyConBoxity tc) (hsep (punctuate comma (map ppr_bndr args))) <+> arrow
where
tc = dataConTyCon dc
ppr_case_pat con args
- = ppr con <+> hsep (map ppr_bndr args) <+> arrow
+ = ppr con <+> sep (map ppr_bndr args) <+> arrow
where
ppr_bndr = pprBndr CaseBind
-pprArg (Type ty) = ptext SLIT("@") <+> pprParendType ty
+pprArg :: OutputableBndr a => Expr a -> SDoc
+pprArg (Type ty) = ptext (sLit "@") <+> pprParendType ty
pprArg expr = pprParendExpr expr
\end{code}
pprCoreBinder :: BindingSite -> Var -> SDoc
pprCoreBinder LetBind binder
- = vcat [sig, pprIdDetails binder, pragmas]
- where
- sig = pprTypedBinder binder
- pragmas = ppIdInfo binder (idInfo binder)
+ | isTyCoVar binder = pprKindedTyVarBndr binder
+ | otherwise = pprTypedBinder binder $$
+ ppIdInfo binder (idInfo binder)
-- Lambda bound type variables are preceded by "@"
-pprCoreBinder LambdaBind bndr = parens (pprTypedBinder bndr)
-
--- Case bound things don't get a signature or a herald, unless we have debug on
-pprCoreBinder CaseBind bndr
+pprCoreBinder bind_site bndr
= getPprStyle $ \ sty ->
- if debugStyle sty then
- parens (pprTypedBinder bndr)
- else
- pprUntypedBinder bndr
+ pprTypedLCBinder bind_site (debugStyle sty) bndr
+pprUntypedBinder :: Var -> SDoc
pprUntypedBinder binder
- | isTyVar binder = ptext SLIT("@") <+> ppr binder -- NB: don't print kind
+ | isTyCoVar binder = ptext (sLit "@") <+> ppr binder -- NB: don't print kind
| otherwise = pprIdBndr binder
+pprTypedLCBinder :: BindingSite -> Bool -> Var -> SDoc
+-- For lambda and case binders, show the unfolding info (usually none)
+pprTypedLCBinder bind_site debug_on var
+ | not debug_on && isDeadBinder var = char '_'
+ | not debug_on, CaseBind <- bind_site = pprUntypedBinder var -- No parens, no kind info
+ | isTyCoVar var = parens (pprKindedTyVarBndr var)
+ | otherwise = parens (hang (pprIdBndr var)
+ 2 (vcat [ dcolon <+> pprType (idType var), pp_unf]))
+ where
+ unf_info = unfoldingInfo (idInfo var)
+ pp_unf | hasSomeUnfolding unf_info = ptext (sLit "Unf=") <> ppr unf_info
+ | otherwise = empty
+
+pprTypedBinder :: Var -> SDoc
+-- Print binder with a type or kind signature (not paren'd)
pprTypedBinder binder
- | isTyVar binder = ptext SLIT("@") <+> pprTyVarBndr binder
- | otherwise = pprIdBndr binder <+> dcolon <+> pprType (idType binder)
+ | isTyCoVar binder = pprKindedTyVarBndr binder
+ | otherwise = hang (pprIdBndr binder) 2 (dcolon <+> pprType (idType binder))
-pprTyVarBndr :: TyVar -> SDoc
-pprTyVarBndr tyvar
- = getPprStyle $ \ sty ->
- if debugStyle sty then
- hsep [ppr tyvar, dcolon, pprParendKind kind]
- -- See comments with ppDcolon in PprCore.lhs
- else
- ppr tyvar
+pprKindedTyVarBndr :: TyVar -> SDoc
+-- Print a type variable binder with its kind (but not if *)
+pprKindedTyVarBndr tyvar
+ = ptext (sLit "@") <+> ppr tyvar <> opt_kind
where
+ opt_kind -- Print the kind if not *
+ | isLiftedTypeKind kind = empty
+ | otherwise = dcolon <> pprKind kind
kind = tyVarKind tyvar
-- pprIdBndr does *not* print the type
-- When printing any Id binder in debug mode, we print its inline pragma and one-shot-ness
+pprIdBndr :: Id -> SDoc
pprIdBndr id = ppr id <+> pprIdBndrInfo (idInfo id)
+pprIdBndrInfo :: IdInfo -> SDoc
pprIdBndrInfo info
- = megaSeqIdInfo `seq` doc -- The seq is useful for poking on black holes
+ = megaSeqIdInfo info `seq` doc -- The seq is useful for poking on black holes
where
prag_info = inlinePragInfo info
occ_info = occInfo info
- dmd_info = newDemandInfo info
+ dmd_info = demandInfo info
lbv_info = lbvarInfo info
- no_info = isAlwaysActive prag_info && isNoOcc occ_info &&
- (case dmd_info of { Nothing -> True; Just d -> isTop d }) &&
- hasNoLBVarInfo lbv_info
-
- doc | no_info = empty
- | otherwise
- = brackets $ hcat [ppr prag_info, ppr occ_info,
- ppr dmd_info, ppr lbv_info
-#ifdef OLD_STRICTNESS
- , ppr (demandInfo id)
-#endif
- ]
+ has_prag = not (isDefaultInlinePragma prag_info)
+ has_occ = not (isNoOcc occ_info)
+ has_dmd = case dmd_info of { Nothing -> False; Just d -> not (isTop d) }
+ has_lbv = not (hasNoLBVarInfo lbv_info)
+
+ doc = showAttributes
+ [ (has_prag, ptext (sLit "InlPrag=") <> ppr prag_info)
+ , (has_occ, ptext (sLit "Occ=") <> ppr occ_info)
+ , (has_dmd, ptext (sLit "Dmd=") <> ppr dmd_info)
+ , (has_lbv , ptext (sLit "Lbv=") <> ppr lbv_info)
+ ]
\end{code}
-\begin{code}
-pprIdDetails :: Id -> SDoc
-pprIdDetails id | isGlobalId id = ppr (globalIdDetails id)
- | isExportedId id = ptext SLIT("[Exported]")
- | otherwise = empty
+-----------------------------------------------------
+-- IdDetails and IdInfo
+-----------------------------------------------------
+\begin{code}
ppIdInfo :: Id -> IdInfo -> SDoc
-ppIdInfo b info
- = brackets $
- vcat [ ppArityInfo a,
- ppWorkerInfo (workerInfo info),
- ppCafInfo (cafInfo info),
-#ifdef OLD_STRICTNESS
- ppStrictnessInfo s,
- ppCprInfo m,
-#endif
- pprNewStrictness (newStrictnessInfo info),
- if null rules then empty
- else ptext SLIT("RULES:") <+> vcat (map pprRule rules)
- -- Inline pragma, occ, demand, lbvar info
+ppIdInfo id info
+ = showAttributes
+ [ (True, pp_scope <> ppr (idDetails id))
+ , (has_arity, ptext (sLit "Arity=") <> int arity)
+ , (has_caf_info, ptext (sLit "Caf=") <> ppr caf_info)
+ , (has_strictness, ptext (sLit "Str=") <> pprStrictness str_info)
+ , (has_unf, ptext (sLit "Unf=") <> ppr unf_info)
+ , (not (null rules), ptext (sLit "RULES:") <+> vcat (map pprRule rules))
+ ] -- Inline pragma, occ, demand, lbvar info
-- printed out with all binders (when debug is on);
-- see PprCore.pprIdBndr
- ]
where
- a = arityInfo info
-#ifdef OLD_STRICTNESS
- s = strictnessInfo info
- m = cprInfo info
-#endif
+ pp_scope | isGlobalId id = ptext (sLit "GblId")
+ | isExportedId id = ptext (sLit "LclIdX")
+ | otherwise = ptext (sLit "LclId")
+
+ arity = arityInfo info
+ has_arity = arity /= 0
+
+ caf_info = cafInfo info
+ has_caf_info = not (mayHaveCafRefs caf_info)
+
+ str_info = strictnessInfo info
+ has_strictness = isJust str_info
+
+ unf_info = unfoldingInfo info
+ has_unf = hasSomeUnfolding unf_info
+
rules = specInfoRules (specInfo info)
+
+showAttributes :: [(Bool,SDoc)] -> SDoc
+showAttributes stuff
+ | null docs = empty
+ | otherwise = brackets (sep (punctuate comma docs))
+ where
+ docs = [d | (True,d) <- stuff]
+\end{code}
+
+-----------------------------------------------------
+-- Unfolding and UnfoldingGuidance
+-----------------------------------------------------
+
+\begin{code}
+instance Outputable UnfoldingGuidance where
+ ppr UnfNever = ptext (sLit "NEVER")
+ ppr (UnfWhen unsat_ok boring_ok)
+ = ptext (sLit "ALWAYS_IF") <>
+ parens (ptext (sLit "unsat_ok=") <> ppr unsat_ok <> comma <>
+ ptext (sLit "boring_ok=") <> ppr boring_ok)
+ ppr (UnfIfGoodArgs { ug_args = cs, ug_size = size, ug_res = discount })
+ = hsep [ ptext (sLit "IF_ARGS"),
+ brackets (hsep (map int cs)),
+ int size,
+ int discount ]
+
+instance Outputable UnfoldingSource where
+ ppr InlineCompulsory = ptext (sLit "Compulsory")
+ ppr (InlineWrapper w) = ptext (sLit "Worker=") <> ppr w
+ ppr InlineRule = ptext (sLit "InlineRule")
+ ppr InlineRhs = ptext (sLit "<vanilla>")
+
+instance Outputable Unfolding where
+ ppr NoUnfolding = ptext (sLit "No unfolding")
+ ppr (OtherCon cs) = ptext (sLit "OtherCon") <+> ppr cs
+ ppr (DFunUnfolding ar con ops) = ptext (sLit "DFun") <> parens (ptext (sLit "arity=") <> int ar)
+ <+> ppr con
+ <+> brackets (pprWithCommas pprParendExpr ops)
+ ppr (CoreUnfolding { uf_src = src
+ , uf_tmpl=rhs, uf_is_top=top, uf_is_value=hnf
+ , uf_is_conlike=conlike, uf_is_cheap=cheap
+ , uf_expandable=exp, uf_guidance=g, uf_arity=arity})
+ = ptext (sLit "Unf") <> braces (pp_info $$ pp_rhs)
+ where
+ pp_info = fsep $ punctuate comma
+ [ ptext (sLit "Src=") <> ppr src
+ , ptext (sLit "TopLvl=") <> ppr top
+ , ptext (sLit "Arity=") <> int arity
+ , ptext (sLit "Value=") <> ppr hnf
+ , ptext (sLit "ConLike=") <> ppr conlike
+ , ptext (sLit "Cheap=") <> ppr cheap
+ , ptext (sLit "Expandable=") <> ppr exp
+ , ptext (sLit "Guidance=") <> ppr g ]
+ pp_tmpl = ptext (sLit "Tmpl=") <+> ppr rhs
+ pp_rhs | isInlineRuleSource src = pp_tmpl
+ | otherwise = empty
+ -- Don't print the RHS or we get a quadratic
+ -- blowup in the size of the printout!
\end{code}
+-----------------------------------------------------
+-- Rules
+-----------------------------------------------------
\begin{code}
instance Outputable CoreRule where
pprRule :: CoreRule -> SDoc
pprRule (BuiltinRule { ru_fn = fn, ru_name = name})
- = ptext SLIT("Built in rule for") <+> ppr fn <> colon <+> doubleQuotes (ftext name)
+ = ptext (sLit "Built in rule for") <+> ppr fn <> colon <+> doubleQuotes (ftext name)
pprRule (Rule { ru_name = name, ru_act = act, ru_fn = fn,
ru_bndrs = tpl_vars, ru_args = tpl_args,
ru_rhs = rhs })
- = doubleQuotes (ftext name) <+> ppr act <+>
- sep [
- ptext SLIT("__forall") <+> braces (sep (map pprTypedBinder tpl_vars)),
- nest 2 (ppr fn <+> sep (map pprArg tpl_args)),
- nest 2 (ptext SLIT("=") <+> pprCoreExpr rhs)
- ] <+> semi
+ = hang (doubleQuotes (ftext name) <+> ppr act)
+ 4 (sep [ptext (sLit "forall") <+> braces (sep (map pprTypedBinder tpl_vars)),
+ nest 2 (ppr fn <+> sep (map pprArg tpl_args)),
+ nest 2 (ptext (sLit "=") <+> pprCoreExpr rhs)
+ ])
\end{code}
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