2 % (c) The University of Glasgow 2006
3 % (c) The AQUA Project, Glasgow University, 1996-1998
6 Printing of Core syntax
10 pprCoreExpr, pprParendExpr,
11 pprCoreBinding, pprCoreBindings, pprCoreAlt,
33 %************************************************************************
35 \subsection{Public interfaces for Core printing (excluding instances)}
37 %************************************************************************
39 @pprParendCoreExpr@ puts parens around non-atomic Core expressions.
42 pprCoreBindings :: OutputableBndr b => [Bind b] -> SDoc
43 pprCoreBinding :: OutputableBndr b => Bind b -> SDoc
44 pprCoreExpr :: OutputableBndr b => Expr b -> SDoc
45 pprParendExpr :: OutputableBndr b => Expr b -> SDoc
47 pprCoreBindings = pprTopBinds
48 pprCoreBinding = pprTopBind
50 instance OutputableBndr b => Outputable (Bind b) where
51 ppr bind = ppr_bind bind
53 instance OutputableBndr b => Outputable (Expr b) where
54 ppr expr = pprCoreExpr expr
58 %************************************************************************
62 %************************************************************************
65 pprTopBinds :: OutputableBndr a => [Bind a] -> SDoc
66 pprTopBinds binds = vcat (map pprTopBind binds)
68 pprTopBind :: OutputableBndr a => Bind a -> SDoc
69 pprTopBind (NonRec binder expr)
70 = ppr_binding (binder,expr) $$ blankLine
73 = ptext (sLit "Rec { }")
74 pprTopBind (Rec (b:bs))
75 = vcat [ptext (sLit "Rec {"),
77 vcat [blankLine $$ ppr_binding b | b <- bs],
78 ptext (sLit "end Rec }"),
83 ppr_bind :: OutputableBndr b => Bind b -> SDoc
85 ppr_bind (NonRec val_bdr expr) = ppr_binding (val_bdr, expr)
86 ppr_bind (Rec binds) = vcat (map pp binds)
88 pp bind = ppr_binding bind <> semi
90 ppr_binding :: OutputableBndr b => (b, Expr b) -> SDoc
91 ppr_binding (val_bdr, expr)
92 = pprBndr LetBind val_bdr $$
93 hang (ppr val_bdr <+> equals) 2 (pprCoreExpr expr)
97 pprParendExpr expr = ppr_expr parens expr
98 pprCoreExpr expr = ppr_expr noParens expr
100 noParens :: SDoc -> SDoc
105 ppr_expr :: OutputableBndr b => (SDoc -> SDoc) -> Expr b -> SDoc
106 -- The function adds parens in context that need
107 -- an atomic value (e.g. function args)
109 ppr_expr add_par (Type ty) = add_par (ptext (sLit "TYPE") <+> ppr ty) -- Wierd
111 ppr_expr _ (Var name) = ppr name
112 ppr_expr _ (Lit lit) = ppr lit
114 ppr_expr add_par (Cast expr co)
116 sep [pprParendExpr expr,
117 ptext (sLit "`cast`") <+> pprCo co]
119 pprCo co | opt_SuppressCoercions = ptext (sLit "...")
121 $ sep [ppr co, dcolon <+> pprEqPred (coercionKind co)]
124 ppr_expr add_par expr@(Lam _ _)
126 (bndrs, body) = collectBinders expr
129 hang (ptext (sLit "\\") <+> sep (map (pprBndr LambdaBind) bndrs) <+> arrow)
132 ppr_expr add_par expr@(App {})
133 = case collectArgs expr of { (fun, args) ->
135 pp_args = sep (map pprArg args)
136 val_args = dropWhile isTypeArg args -- Drop the type arguments for tuples
137 pp_tup_args = sep (punctuate comma (map pprCoreExpr val_args))
140 Var f -> case isDataConWorkId_maybe f of
141 -- Notice that we print the *worker*
142 -- for tuples in paren'd format.
143 Just dc | saturated && isTupleTyCon tc
144 -> tupleParens (tupleTyConBoxity tc) pp_tup_args
147 saturated = val_args `lengthIs` idArity f
149 _ -> add_par (hang (ppr f) 2 pp_args)
151 _ -> add_par (hang (pprParendExpr fun) 2 pp_args)
154 ppr_expr add_par (Case expr var ty [(con,args,rhs)])
156 sep [sep [ptext (sLit "case") <+> pprCoreExpr expr,
157 ifPprDebug (braces (ppr ty)),
158 sep [ptext (sLit "of") <+> ppr_bndr var,
159 char '{' <+> ppr_case_pat con args]
165 ppr_bndr = pprBndr CaseBind
167 ppr_expr add_par (Case expr var ty alts)
169 sep [sep [ptext (sLit "case")
171 <+> ifPprDebug (braces (ppr ty)),
172 ptext (sLit "of") <+> ppr_bndr var <+> char '{'],
173 nest 2 (sep (punctuate semi (map pprCoreAlt alts))),
177 ppr_bndr = pprBndr CaseBind
180 -- special cases: let ... in let ...
181 -- ("disgusting" SLPJ)
184 ppr_expr add_par (Let bind@(NonRec val_bdr rhs@(Let _ _)) body)
187 hsep [ptext (sLit "let {"), (pprBndr LetBind val_bdr $$ ppr val_bndr), equals],
188 nest 2 (pprCoreExpr rhs),
192 ppr_expr add_par (Let bind@(NonRec val_bdr rhs) expr@(Let _ _))
194 (hang (ptext (sLit "let {"))
195 2 (hsep [ppr_binding (val_bdr,rhs),
196 ptext (sLit "} in")])
201 -- General case (recursive case, too)
202 ppr_expr add_par (Let bind expr)
204 sep [hang (ptext keyword) 2 (ppr_bind bind <+> ptext (sLit "} in")),
207 keyword = case bind of
208 Rec _ -> (sLit "letrec {")
209 NonRec _ _ -> (sLit "let {")
211 ppr_expr add_par (Note (SCC cc) expr)
212 = add_par (sep [pprCostCentreCore cc, pprCoreExpr expr])
214 ppr_expr add_par (Note (CoreNote s) expr)
216 sep [sep [ptext (sLit "__core_note"), pprHsString (mkFastString s)],
219 pprCoreAlt :: OutputableBndr a => (AltCon, [a] , Expr a) -> SDoc
220 pprCoreAlt (con, args, rhs)
221 = hang (ppr_case_pat con args) 2 (pprCoreExpr rhs)
223 ppr_case_pat :: OutputableBndr a => AltCon -> [a] -> SDoc
224 ppr_case_pat (DataAlt dc) args
226 = tupleParens (tupleTyConBoxity tc) (hsep (punctuate comma (map ppr_bndr args))) <+> arrow
228 ppr_bndr = pprBndr CaseBind
231 ppr_case_pat con args
232 = ppr con <+> sep (map ppr_bndr args) <+> arrow
234 ppr_bndr = pprBndr CaseBind
236 pprArg :: OutputableBndr a => Expr a -> SDoc
237 pprArg (Type ty) = ptext (sLit "@") <+> pprParendType ty
238 pprArg expr = pprParendExpr expr
241 Other printing bits-and-bobs used with the general @pprCoreBinding@
242 and @pprCoreExpr@ functions.
245 instance OutputableBndr Var where
246 pprBndr = pprCoreBinder
248 pprCoreBinder :: BindingSite -> Var -> SDoc
249 pprCoreBinder LetBind binder
250 | isTyVar binder = pprKindedTyVarBndr binder
251 | otherwise = pprTypedBinder binder $$
252 ppIdInfo binder (idInfo binder)
254 -- Lambda bound type variables are preceded by "@"
255 pprCoreBinder LambdaBind bndr
257 = getPprStyle $ \ sty ->
258 if debugStyle sty then
259 parens (pprTypedBinder bndr)
263 = parens (pprTypedBinder bndr)
265 -- Case bound things don't get a signature or a herald, unless we have debug on
266 pprCoreBinder CaseBind bndr
267 = getPprStyle $ \ sty ->
268 if debugStyle sty then
269 parens (pprTypedBinder bndr)
271 if isDeadBinder bndr then char '_'
272 else pprUntypedBinder bndr
274 pprUntypedBinder :: Var -> SDoc
275 pprUntypedBinder binder
276 | isTyVar binder = ptext (sLit "@") <+> ppr binder -- NB: don't print kind
277 | otherwise = pprIdBndr binder
279 pprTypedBinder :: Var -> SDoc
280 -- Print binder with a type or kind signature (not paren'd)
281 pprTypedBinder binder
282 | isTyVar binder = pprKindedTyVarBndr binder
283 | otherwise = hang (pprIdBndr binder) 2 (dcolon <+> pprType (idType binder))
285 pprKindedTyVarBndr :: TyVar -> SDoc
286 -- Print a type variable binder with its kind (but not if *)
287 pprKindedTyVarBndr tyvar
288 = ptext (sLit "@") <+> ppr tyvar <> opt_kind
290 opt_kind -- Print the kind if not *
291 | isLiftedTypeKind kind = empty
292 | otherwise = dcolon <> pprKind kind
293 kind = tyVarKind tyvar
295 -- pprIdBndr does *not* print the type
296 -- When printing any Id binder in debug mode, we print its inline pragma and one-shot-ness
297 pprIdBndr :: Id -> SDoc
298 pprIdBndr id = ppr id <+> pprIdBndrInfo (idInfo id)
300 pprIdBndrInfo :: IdInfo -> SDoc
302 = megaSeqIdInfo info `seq` doc -- The seq is useful for poking on black holes
304 prag_info = inlinePragInfo info
305 occ_info = occInfo info
306 dmd_info = demandInfo info
307 lbv_info = lbvarInfo info
309 has_prag = not (isDefaultInlinePragma prag_info)
310 has_occ = not (isNoOcc occ_info)
311 has_dmd = case dmd_info of { Nothing -> False; Just d -> not (isTop d) }
312 has_lbv = not (hasNoLBVarInfo lbv_info)
315 [ (has_prag, ptext (sLit "InlPrag=") <> ppr prag_info)
316 , (has_occ, ptext (sLit "Occ=") <> ppr occ_info)
317 , (has_dmd, ptext (sLit "Dmd=") <> ppr dmd_info)
318 , (has_lbv , ptext (sLit "Lbv=") <> ppr lbv_info)
323 -----------------------------------------------------
324 -- IdDetails and IdInfo
325 -----------------------------------------------------
328 ppIdInfo :: Id -> IdInfo -> SDoc
331 [ (True, pp_scope <> ppr (idDetails id))
332 , (has_arity, ptext (sLit "Arity=") <> int arity)
333 , (has_caf_info, ptext (sLit "Caf=") <> ppr caf_info)
334 , (has_strictness, ptext (sLit "Str=") <> pprStrictness str_info)
335 , (has_unf, ptext (sLit "Unf=") <> ppr unf_info)
336 , (not (null rules), ptext (sLit "RULES:") <+> vcat (map pprRule rules))
337 ] -- Inline pragma, occ, demand, lbvar info
338 -- printed out with all binders (when debug is on);
339 -- see PprCore.pprIdBndr
341 pp_scope | isGlobalId id = ptext (sLit "GblId")
342 | isExportedId id = ptext (sLit "LclIdX")
343 | otherwise = ptext (sLit "LclId")
345 arity = arityInfo info
346 has_arity = arity /= 0
348 caf_info = cafInfo info
349 has_caf_info = not (mayHaveCafRefs caf_info)
351 str_info = strictnessInfo info
352 has_strictness = isJust str_info
354 unf_info = unfoldingInfo info
355 has_unf = hasSomeUnfolding unf_info
357 rules = specInfoRules (specInfo info)
359 showAttributes :: [(Bool,SDoc)] -> SDoc
362 | otherwise = brackets (sep (punctuate comma docs))
364 docs = [d | (True,d) <- stuff]
367 -----------------------------------------------------
368 -- Unfolding and UnfoldingGuidance
369 -----------------------------------------------------
372 instance Outputable UnfoldingGuidance where
373 ppr UnfNever = ptext (sLit "NEVER")
374 ppr (UnfWhen sat_ok boring_ok)
375 = ptext (sLit "ALWAYS_IF") <>
376 parens (ptext (sLit "sat_ok=") <> ppr sat_ok <> comma <>
377 ptext (sLit "boring_ok=") <> ppr boring_ok)
378 ppr (UnfIfGoodArgs { ug_args = cs, ug_size = size, ug_res = discount })
379 = hsep [ ptext (sLit "IF_ARGS"),
380 brackets (hsep (map int cs)),
384 instance Outputable UnfoldingSource where
385 ppr InlineCompulsory = ptext (sLit "Compulsory")
386 ppr (InlineWrapper w) = ptext (sLit "Worker=") <> ppr w
387 ppr InlineRule = ptext (sLit "InlineRule")
388 ppr InlineRhs = ptext (sLit "<vanilla>")
390 instance Outputable Unfolding where
391 ppr NoUnfolding = ptext (sLit "No unfolding")
392 ppr (OtherCon cs) = ptext (sLit "OtherCon") <+> ppr cs
393 ppr (DFunUnfolding con ops) = ptext (sLit "DFun") <+> ppr con
394 <+> brackets (pprWithCommas pprParendExpr ops)
395 ppr (CoreUnfolding { uf_src = src
396 , uf_tmpl=rhs, uf_is_top=top, uf_is_value=hnf
397 , uf_is_conlike=conlike, uf_is_cheap=cheap
398 , uf_expandable=exp, uf_guidance=g, uf_arity=arity})
399 = ptext (sLit "Unf") <> braces (pp_info $$ pp_rhs)
401 pp_info = fsep $ punctuate comma
402 [ ptext (sLit "Src=") <> ppr src
403 , ptext (sLit "TopLvl=") <> ppr top
404 , ptext (sLit "Arity=") <> int arity
405 , ptext (sLit "Value=") <> ppr hnf
406 , ptext (sLit "ConLike=") <> ppr conlike
407 , ptext (sLit "Cheap=") <> ppr cheap
408 , ptext (sLit "Expandable=") <> ppr exp
409 , ptext (sLit "Guidance=") <> ppr g ]
410 pp_tmpl = ptext (sLit "Tmpl=") <+> ppr rhs
411 pp_rhs | isInlineRuleSource src = pp_tmpl
413 -- Don't print the RHS or we get a quadratic
414 -- blowup in the size of the printout!
417 -----------------------------------------------------
419 -----------------------------------------------------
422 instance Outputable CoreRule where
425 pprRules :: [CoreRule] -> SDoc
426 pprRules rules = vcat (map pprRule rules)
428 pprRule :: CoreRule -> SDoc
429 pprRule (BuiltinRule { ru_fn = fn, ru_name = name})
430 = ptext (sLit "Built in rule for") <+> ppr fn <> colon <+> doubleQuotes (ftext name)
432 pprRule (Rule { ru_name = name, ru_act = act, ru_fn = fn,
433 ru_bndrs = tpl_vars, ru_args = tpl_args,
435 = hang (doubleQuotes (ftext name) <+> ppr act)
436 4 (sep [ptext (sLit "forall") <+> braces (sep (map pprTypedBinder tpl_vars)),
437 nest 2 (ppr fn <+> sep (map pprArg tpl_args)),
438 nest 2 (ptext (sLit "=") <+> pprCoreExpr rhs)