2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 %************************************************************************
6 \section[PprAbsC]{Pretty-printing Abstract~C}
8 %************************************************************************
18 #include "HsVersions.h"
25 import AbsCUtils ( getAmodeRep, nonemptyAbsC,
26 mixedPtrLocn, mixedTypeLocn
29 import Constants ( mIN_UPD_SIZE )
30 import ForeignCall ( CCallSpec(..), CCallTarget(..), playSafe, ccallConvAttribute )
31 import CLabel ( externallyVisibleCLabel,
32 needsCDecl, pprCLabel,
33 mkReturnInfoLabel, mkReturnPtLabel, mkClosureTblLabel,
34 mkClosureLabel, mkErrorStdEntryLabel,
35 CLabel, CLabelType(..), labelType, labelDynamic
38 import CmdLineOpts ( opt_SccProfilingOn, opt_GranMacros )
39 import CostCentre ( pprCostCentreDecl, pprCostCentreStackDecl )
41 import Costs ( costs, addrModeCosts, CostRes(..), Side(..) )
42 import CStrings ( pprStringInCStyle, pprCLabelString )
43 import FiniteMap ( addToFM, emptyFM, lookupFM, FiniteMap )
44 import Literal ( Literal(..) )
45 import TyCon ( tyConDataCons )
46 import Name ( NamedThing(..) )
47 import DataCon ( dataConWrapId )
48 import Maybes ( maybeToBool, catMaybes )
49 import PrimOp ( primOpNeedsWrapper )
50 import MachOp ( MachOp(..) )
51 import ForeignCall ( ForeignCall(..) )
52 import PrimRep ( isFloatingRep, PrimRep(..), getPrimRepSize, getPrimRepArrayElemSize )
53 import SMRep ( pprSMRep )
54 import Unique ( pprUnique, Unique{-instance NamedThing-} )
55 import UniqSet ( emptyUniqSet, elementOfUniqSet,
56 addOneToUniqSet, UniqSet
58 import StgSyn ( StgOp(..) )
59 import BitSet ( BitSet, intBS )
62 import Util ( lengthExceeds, listLengthCmp )
63 import Maybe ( isNothing, maybeToList )
70 For spitting out the costs of an abstract~C expression, @writeRealC@
71 now not only prints the C~code of the @absC@ arg but also adds a macro
72 call to a cost evaluation function @GRAN_EXEC@. For that,
73 @pprAbsC@ has a new ``costs'' argument. %% HWL
77 writeRealC :: Handle -> AbstractC -> IO ()
78 writeRealC handle absC
79 -- avoid holding on to the whole of absC in the !Gransim case.
81 then printForCFast fp (pprAbsC absC (costs absC))
82 else printForCFast fp (pprAbsC absC (panic "costs"))
83 --printForC handle (pprAbsC absC (panic "costs"))
84 dumpRealC :: AbstractC -> SDoc
85 dumpRealC absC = pprAbsC absC (costs absC)
88 writeRealC :: Handle -> AbstractC -> IO ()
89 --writeRealC handle absC =
91 -- printDoc LeftMode handle (pprAbsC absC (costs absC))
93 writeRealC handle absC
94 | opt_GranMacros = _scc_ "writeRealC" printForC handle $
95 pprCode CStyle (pprAbsC absC (costs absC))
96 | otherwise = _scc_ "writeRealC" printForC handle $
97 pprCode CStyle (pprAbsC absC (panic "costs"))
99 dumpRealC :: AbstractC -> SDoc
101 | opt_GranMacros = pprCode CStyle (pprAbsC absC (costs absC))
102 | otherwise = pprCode CStyle (pprAbsC absC (panic "costs"))
106 This emits the macro, which is used in GrAnSim to compute the total costs
107 from a cost 5 tuple. %% HWL
110 emitMacro :: CostRes -> SDoc
112 emitMacro _ | not opt_GranMacros = empty
114 emitMacro (Cost (i,b,l,s,f))
115 = hcat [ ptext SLIT("GRAN_EXEC"), char '(',
116 int i, comma, int b, comma, int l, comma,
117 int s, comma, int f, pp_paren_semi ]
119 pp_paren_semi = text ");"
122 New type: Now pprAbsC also takes the costs for evaluating the Abstract C
123 code as an argument (that's needed when spitting out the GRAN_EXEC macro
124 which must be done before the return i.e. inside absC code) HWL
127 pprAbsC :: AbstractC -> CostRes -> SDoc
128 pprAbsC AbsCNop _ = empty
129 pprAbsC (AbsCStmts s1 s2) c = ($$) (pprAbsC s1 c) (pprAbsC s2 c)
131 pprAbsC (CAssign dest src) _ = pprAssign (getAmodeRep dest) dest src
133 pprAbsC (CJump target) c
134 = ($$) (hcat [emitMacro c {-WDP:, text "/* <--++ CJump */"-} ])
135 (hcat [ text jmp_lit, pprAmode target, pp_paren_semi ])
137 pprAbsC (CFallThrough target) c
138 = ($$) (hcat [emitMacro c {-WDP:, text "/* <--++ CFallThrough */"-} ])
139 (hcat [ text jmp_lit, pprAmode target, pp_paren_semi ])
141 -- --------------------------------------------------------------------------
142 -- Spit out GRAN_EXEC macro immediately before the return HWL
144 pprAbsC (CReturn am return_info) c
145 = ($$) (hcat [emitMacro c {-WDP:, text "/* <---- CReturn */"-} ])
146 (hcat [text jmp_lit, target, pp_paren_semi ])
148 target = case return_info of
149 DirectReturn -> hcat [ptext SLIT("ENTRY_CODE"), lparen,
151 DynamicVectoredReturn am' -> mk_vector (pprAmode am')
152 StaticVectoredReturn n -> mk_vector (int n) -- Always positive
153 mk_vector x = hcat [ptext SLIT("RET_VEC"), char '(', pprAmode am, comma,
156 pprAbsC (CSplitMarker) _ = ptext SLIT("__STG_SPLIT_MARKER")
158 -- we optimise various degenerate cases of CSwitches.
160 -- --------------------------------------------------------------------------
161 -- Assume: CSwitch is also end of basic block
162 -- costs function yields nullCosts for whole switch
163 -- ==> inherited costs c are those of basic block up to switch
164 -- ==> inherit c + costs for the corresponding branch
166 -- --------------------------------------------------------------------------
168 pprAbsC (CSwitch discrim [] deflt) c
169 = pprAbsC deflt (c + costs deflt)
170 -- Empty alternative list => no costs for discrim as nothing cond. here HWL
172 pprAbsC (CSwitch discrim [(tag,alt_code)] deflt) c -- only one alt
173 = case (nonemptyAbsC deflt) of
174 Nothing -> -- one alt and no default
175 pprAbsC alt_code (c + costs alt_code)
176 -- Nothing conditional in here either HWL
178 Just dc -> -- make it an "if"
179 do_if_stmt discrim tag alt_code dc c
181 -- What problem is the re-ordering trying to solve ?
182 pprAbsC (CSwitch discrim [(tag1@(MachInt i1), alt_code1),
183 (tag2@(MachInt i2), alt_code2)] deflt) c
184 | empty_deflt && ((i1 == 0 && i2 == 1) || (i1 == 1 && i2 == 0))
186 do_if_stmt discrim tag1 alt_code1 alt_code2 c
188 do_if_stmt discrim tag2 alt_code2 alt_code1 c
190 empty_deflt = not (maybeToBool (nonemptyAbsC deflt))
192 pprAbsC (CSwitch discrim alts deflt) c -- general case
193 | isFloatingRep (getAmodeRep discrim)
194 = pprAbsC (foldr ( \ a -> CSwitch discrim [a]) deflt alts) c
197 hcat [text "switch (", pp_discrim, text ") {"],
198 nest 2 (vcat (map ppr_alt alts)),
199 (case (nonemptyAbsC deflt) of
202 nest 2 (vcat [ptext SLIT("default:"),
203 pprAbsC dc (c + switch_head_cost
205 ptext SLIT("break;")])),
212 = vcat [ hcat [ptext SLIT("case "), pprBasicLit lit, char ':'],
213 nest 2 (($$) (pprAbsC absC (c + switch_head_cost + costs absC))
214 (ptext SLIT("break;"))) ]
216 -- Costs for addressing header of switch and cond. branching -- HWL
217 switch_head_cost = addrModeCosts discrim Rhs + (Cost (0, 1, 0, 0, 0))
219 pprAbsC stmt@(COpStmt results (StgFCallOp fcall uniq) args vol_regs) _
220 = pprFCall fcall uniq args results vol_regs
222 pprAbsC stmt@(COpStmt results (StgPrimOp op) args vol_regs) _
224 non_void_args = grab_non_void_amodes args
225 non_void_results = grab_non_void_amodes results
226 -- if just one result, we print in the obvious "assignment" style;
227 -- if 0 or many results, we emit a macro call, w/ the results
228 -- followed by the arguments. The macro presumably knows which
231 the_op = ppr_op_call non_void_results non_void_args
232 -- liveness mask is *in* the non_void_args
234 if primOpNeedsWrapper op then
235 case (ppr_vol_regs vol_regs) of { (pp_saves, pp_restores) ->
244 ppr_op_call results args
245 = hcat [ ppr op, lparen,
246 hcat (punctuate comma (map ppr_op_result results)),
247 if null results || null args then empty else comma,
248 hcat (punctuate comma (map pprAmode args)),
251 ppr_op_result r = ppr_amode r
252 -- primop macros do their own casting of result;
253 -- hence we can toss the provided cast...
255 -- NEW CASES FOR EXPANDED PRIMOPS
257 -- We have to deal with some of these specially
258 pprAbsC (CMachOpStmt (Just res) (MO_ReadOSBI offw scaleRep)
259 [baseAmode, indexAmode] maybe_vols)
261 | isNothing maybe_vols
262 = hcat [ -- text " /* ReadOSBI */ ",
263 ppr_amode res, equals,
264 ppr_array_expression offw scaleRep baseAmode indexAmode,
267 = panic "pprAbsC:MO_ReadOSBI -- out-of-line array indexing ?!?!"
269 pprAbsC (CMachOpStmt Nothing (MO_WriteOSBI offw scaleRep)
270 [baseAmode, indexAmode, vAmode] maybe_vols)
272 | isNothing maybe_vols
273 = hcat [ -- text " /* WriteOSBI */ ",
274 ppr_array_expression offw scaleRep baseAmode indexAmode,
275 equals, pprAmode vAmode,
278 = panic "pprAbsC:MO_WriteOSBI -- out-of-line array indexing ?!?!"
280 -- The rest generically.
282 pprAbsC stmt@(CMachOpStmt (Just res) mop [arg1,arg2] maybe_vols) _
283 = let prefix_fn = mop `elem` [MO_Dbl_Pwr, MO_Flt_Pwr, MO_NatS_MulMayOflo]
285 case ppr_maybe_vol_regs maybe_vols of {(saves,restores) ->
288 [ppr_amode res, equals]
290 then [pprMachOp_for_C mop, parens (pprAmode arg1 <> comma <> pprAmode arg2)]
291 else [pprAmode arg1, pprMachOp_for_C mop, pprAmode arg2])
297 pprAbsC stmt@(CMachOpStmt (Just res) mop [arg1] maybe_vols) _
298 = case ppr_maybe_vol_regs maybe_vols of {(saves,restores) ->
300 hcat [ppr_amode res, equals,
301 pprMachOp_for_C mop, parens (pprAmode arg1),
306 pprAbsC stmt@(CSequential stuff) c
307 = vcat (map (flip pprAbsC c) stuff)
309 -- end of NEW CASES FOR EXPANDED PRIMOPS
311 pprAbsC stmt@(CSRT lbl closures) c
312 = case (pprTempAndExternDecls stmt) of { (_, pp_exts) ->
314 $$ ptext SLIT("SRT") <> lparen <> pprCLabel lbl <> rparen
315 $$ nest 2 (hcat (punctuate comma (map pp_closure_lbl closures)))
319 pprAbsC stmt@(CBitmap lbl mask) c
320 = pp_bitmap_switch mask semi $
321 hcat [ ptext SLIT("BITMAP"), lparen,
322 pprCLabel lbl, comma,
323 int (length mask), comma,
324 pp_bitmap mask, rparen ]
326 pprAbsC (CSimultaneous abs_c) c
327 = hcat [ptext SLIT("{{"), pprAbsC abs_c c, ptext SLIT("}}")]
329 pprAbsC (CCheck macro as code) c
330 = hcat [ptext (cCheckMacroText macro), lparen,
331 hcat (punctuate comma (map ppr_amode as)), comma,
332 pprAbsC code c, pp_paren_semi
334 pprAbsC (CMacroStmt macro as) _
335 = hcat [ptext (cStmtMacroText macro), lparen,
336 hcat (punctuate comma (map ppr_amode as)),pp_paren_semi] -- no casting
337 pprAbsC (CCallProfCtrMacro op as) _
338 = hcat [ptext op, lparen,
339 hcat (punctuate comma (map ppr_amode as)),pp_paren_semi]
340 pprAbsC (CCallProfCCMacro op as) _
341 = hcat [ptext op, lparen,
342 hcat (punctuate comma (map ppr_amode as)),pp_paren_semi]
343 pprAbsC stmt@(CCallTypedef is_tdef (CCallSpec op_str cconv _) uniq results args) _
344 = hsep [ ptext (if is_tdef then SLIT("typedef") else SLIT("extern"))
347 , parens (hsep (punctuate comma ccall_decl_ty_args))
351 In the non-casm case, to ensure that we're entering the given external
352 entry point using the correct calling convention, we have to do the following:
354 - When entering via a function pointer (the `dynamic' case) using the specified
355 calling convention, we emit a typedefn declaration attributed with the
356 calling convention to use together with the result and parameter types we're
357 assuming. Coerce the function pointer to this type and go.
359 - to enter the function at a given code label, we emit an extern declaration
360 for the label here, stating the calling convention together with result and
361 argument types we're assuming.
363 The C compiler will hopefully use this extern declaration to good effect,
364 reporting any discrepancies between our extern decl and any other that
367 Re: calling convention, notice that gcc (2.8.1 and egcs-1.0.2) will for
368 the external function `foo' use the calling convention of the first `foo'
369 prototype it encounters (nor does it complain about conflicting attribute
370 declarations). The consequence of this is that you cannot override the
371 calling convention of `foo' using an extern declaration (you'd have to use
372 a typedef), but why you would want to do such a thing in the first place
373 is totally beyond me.
375 ToDo: petition the gcc folks to add code to warn about conflicting attribute
381 | is_tdef = parens (text (ccallConvAttribute cconv) <+> char '*' <> ccall_fun_ty)
382 | otherwise = text (ccallConvAttribute cconv) <+> ccall_fun_ty
386 DynamicTarget -> ptext SLIT("_ccall_fun_ty") <> ppr uniq
387 StaticTarget x -> pprCLabelString x
390 case non_void_results of
391 [] -> ptext SLIT("void")
392 [amode] -> ppr (getAmodeRep amode)
393 _ -> panic "pprAbsC{CCallTypedef}: ccall_res_ty"
396 | is_tdef = tail ccall_arg_tys
397 | otherwise = ccall_arg_tys
399 ccall_arg_tys = map (ppr . getAmodeRep) non_void_args
401 -- the first argument will be the "I/O world" token (a VoidRep)
402 -- all others should be non-void
405 in ASSERT (all non_void nvas) nvas
407 -- there will usually be two results: a (void) state which we
408 -- should ignore and a (possibly void) result.
410 let nvrs = grab_non_void_amodes results
411 in ASSERT (listLengthCmp nvrs 1 /= GT) nvrs
413 pprAbsC (CCodeBlock lbl abs_C) _
414 = if not (maybeToBool(nonemptyAbsC abs_C)) then
415 pprTrace "pprAbsC: curious empty code block for" (pprCLabel lbl) empty
417 case (pprTempAndExternDecls abs_C) of { (pp_temps, pp_exts) ->
421 hcat [text (if (externallyVisibleCLabel lbl)
422 then "FN_(" -- abbreviations to save on output
424 pprCLabel lbl, text ") {"],
428 nest 8 (ptext SLIT("FB_")),
429 nest 8 (pprAbsC abs_C (costs abs_C)),
430 nest 8 (ptext SLIT("FE_")),
436 pprAbsC (CInitHdr cl_info amode cost_centre size) _
437 = hcat [ ptext SLIT("SET_HDR_"), char '(',
438 ppr_amode amode, comma,
439 pprCLabelAddr info_lbl, comma,
440 if_profiling (pprAmode cost_centre), comma,
441 if_profiling (int size),
444 info_lbl = infoTableLabelFromCI cl_info
447 pprAbsC stmt@(CStaticClosure cl_info cost_centre amodes) _
448 = case (pprTempAndExternDecls stmt) of { (_, pp_exts) ->
452 ptext SLIT("SET_STATIC_HDR"), char '(',
453 pprCLabel closure_lbl, comma,
454 pprCLabel info_lbl, comma,
455 if_profiling (pprAmode cost_centre), comma,
456 ppLocalness closure_lbl, comma,
457 ppLocalnessMacro True{-include dyn-} info_lbl,
460 nest 2 (ppr_payload amodes),
464 closure_lbl = closureLabelFromCI cl_info
465 info_lbl = infoTableLabelFromCI cl_info
467 ppr_payload [] = empty
468 ppr_payload ls = comma <+>
469 braces (hsep (punctuate comma (map ((text "(L_)" <>).ppr_item) ls)))
472 | rep == VoidRep = text "0" -- might not even need this...
473 | rep == FloatRep = ppr_amode (floatToWord item)
474 | rep == DoubleRep = hcat (punctuate (text ", (L_)")
475 (map ppr_amode (doubleToWords item)))
476 | otherwise = ppr_amode item
478 rep = getAmodeRep item
481 pprAbsC stmt@(CClosureInfoAndCode cl_info slow maybe_fast cl_descr) _
484 ptext SLIT("INFO_TABLE"),
485 ( if is_selector then
486 ptext SLIT("_SELECTOR")
487 else if is_constr then
488 ptext SLIT("_CONSTR")
489 else if needs_srt then
491 else empty ), char '(',
493 pprCLabel info_lbl, comma,
494 pprCLabel slow_lbl, comma,
495 pp_rest, {- ptrs,nptrs,[srt,]type,-} comma,
497 ppLocalness info_lbl, comma,
498 ppLocalnessMacro True{-include dyn-} slow_lbl, comma,
500 if_profiling pp_descr, comma,
501 if_profiling pp_type,
507 Just fast -> let stuff = CCodeBlock fast_lbl fast in
508 pprAbsC stuff (costs stuff)
511 info_lbl = infoTableLabelFromCI cl_info
512 fast_lbl = fastLabelFromCI cl_info
515 = case (nonemptyAbsC slow) of
516 Nothing -> (mkErrorStdEntryLabel, empty)
517 Just xx -> (entryLabelFromCI cl_info,
518 let stuff = CCodeBlock slow_lbl xx in
519 pprAbsC stuff (costs stuff))
521 maybe_selector = maybeSelectorInfo cl_info
522 is_selector = maybeToBool maybe_selector
523 (Just select_word_i) = maybe_selector
525 maybe_tag = closureSemiTag cl_info
526 is_constr = maybeToBool maybe_tag
527 (Just tag) = maybe_tag
529 srt = closureSRT cl_info
530 needs_srt = case srt of
535 size = closureNonHdrSize cl_info
537 ptrs = closurePtrsSize cl_info
540 pp_rest | is_selector = int select_word_i
545 hcat [ int tag, comma ]
546 else if needs_srt then
551 type_str = pprSMRep (closureSMRep cl_info)
553 pp_descr = pprStringInCStyle cl_descr
554 pp_type = pprStringInCStyle (closureTypeDescr cl_info)
556 pprAbsC stmt@(CClosureTbl tycon) _
558 ptext SLIT("CLOSURE_TBL") <>
559 lparen <> pprCLabel (mkClosureTblLabel tycon) <> rparen :
561 map (pp_closure_lbl . mkClosureLabel . getName . dataConWrapId) (tyConDataCons tycon)
563 ) $$ ptext SLIT("};")
565 pprAbsC stmt@(CRetDirect uniq code srt liveness) _
568 ptext SLIT("INFO_TABLE_SRT_BITMAP"), lparen,
569 pprCLabel info_lbl, comma,
570 pprCLabel entry_lbl, comma,
571 pp_liveness liveness, comma, -- bitmap
572 pp_srt_info srt, -- SRT
573 closure_type, comma, -- closure type
574 ppLocalness info_lbl, comma, -- info table storage class
575 ppLocalnessMacro True{-include dyn-} entry_lbl, comma, -- entry pt storage class
582 info_lbl = mkReturnInfoLabel uniq
583 entry_lbl = mkReturnPtLabel uniq
585 pp_code = let stuff = CCodeBlock entry_lbl code in
586 pprAbsC stuff (costs stuff)
588 closure_type = pp_liveness_switch liveness
589 (ptext SLIT("RET_SMALL"))
590 (ptext SLIT("RET_BIG"))
592 pprAbsC stmt@(CRetVector lbl amodes srt liveness) _
593 = case (pprTempAndExternDecls stmt) of { (_, pp_exts) ->
597 ptext SLIT("VEC_INFO_") <> int size,
599 pprCLabel lbl, comma,
600 pp_liveness liveness, comma, -- bitmap liveness mask
601 pp_srt_info srt, -- SRT
603 ppLocalness lbl, comma
605 nest 2 (sep (punctuate comma (map ppr_item amodes))),
611 ppr_item item = (<>) (text "(F_) ") (ppr_amode item)
614 closure_type = pp_liveness_switch liveness
615 (ptext SLIT("RET_VEC_SMALL"))
616 (ptext SLIT("RET_VEC_BIG"))
619 pprAbsC stmt@(CModuleInitBlock lbl code) _
621 ptext SLIT("START_MOD_INIT") <> parens (pprCLabel lbl),
622 case (pprTempAndExternDecls stmt) of { (_, pp_exts) -> pp_exts },
623 pprAbsC code (costs code),
624 hcat [ptext SLIT("END_MOD_INIT"), lparen, rparen]
627 pprAbsC (CCostCentreDecl is_local cc) _ = pprCostCentreDecl is_local cc
628 pprAbsC (CCostCentreStackDecl ccs) _ = pprCostCentreStackDecl ccs
632 -- Print a CMachOp in a way suitable for emitting via C.
633 pprMachOp_for_C MO_Nat_Add = char '+'
634 pprMachOp_for_C MO_Nat_Sub = char '-'
635 pprMachOp_for_C MO_Nat_Eq = text "=="
636 pprMachOp_for_C MO_Nat_Ne = text "!="
638 pprMachOp_for_C MO_NatS_Ge = text ">="
639 pprMachOp_for_C MO_NatS_Le = text "<="
640 pprMachOp_for_C MO_NatS_Gt = text ">"
641 pprMachOp_for_C MO_NatS_Lt = text "<"
643 pprMachOp_for_C MO_NatU_Ge = text ">="
644 pprMachOp_for_C MO_NatU_Le = text "<="
645 pprMachOp_for_C MO_NatU_Gt = text ">"
646 pprMachOp_for_C MO_NatU_Lt = text "<"
648 pprMachOp_for_C MO_NatS_Mul = char '*'
649 pprMachOp_for_C MO_NatS_MulMayOflo = text "mulIntMayOflo"
650 pprMachOp_for_C MO_NatS_Quot = char '/'
651 pprMachOp_for_C MO_NatS_Rem = char '%'
652 pprMachOp_for_C MO_NatS_Neg = char '-'
654 pprMachOp_for_C MO_NatU_Mul = char '*'
655 pprMachOp_for_C MO_NatU_Quot = char '/'
656 pprMachOp_for_C MO_NatU_Rem = char '%'
658 pprMachOp_for_C MO_Nat_And = text "&"
659 pprMachOp_for_C MO_Nat_Or = text "|"
660 pprMachOp_for_C MO_Nat_Xor = text "^"
661 pprMachOp_for_C MO_Nat_Not = text "~"
662 pprMachOp_for_C MO_Nat_Shl = text "<<"
663 pprMachOp_for_C MO_Nat_Shr = text ">>"
664 pprMachOp_for_C MO_Nat_Sar = text ">>"
666 pprMachOp_for_C MO_32U_Eq = text "=="
667 pprMachOp_for_C MO_32U_Ne = text "!="
668 pprMachOp_for_C MO_32U_Ge = text ">="
669 pprMachOp_for_C MO_32U_Le = text "<="
670 pprMachOp_for_C MO_32U_Gt = text ">"
671 pprMachOp_for_C MO_32U_Lt = text "<"
673 pprMachOp_for_C MO_Dbl_Eq = text "=="
674 pprMachOp_for_C MO_Dbl_Ne = text "!="
675 pprMachOp_for_C MO_Dbl_Ge = text ">="
676 pprMachOp_for_C MO_Dbl_Le = text "<="
677 pprMachOp_for_C MO_Dbl_Gt = text ">"
678 pprMachOp_for_C MO_Dbl_Lt = text "<"
680 pprMachOp_for_C MO_Dbl_Add = text "+"
681 pprMachOp_for_C MO_Dbl_Sub = text "-"
682 pprMachOp_for_C MO_Dbl_Mul = text "*"
683 pprMachOp_for_C MO_Dbl_Div = text "/"
684 pprMachOp_for_C MO_Dbl_Pwr = text "pow"
686 pprMachOp_for_C MO_Dbl_Sin = text "sin"
687 pprMachOp_for_C MO_Dbl_Cos = text "cos"
688 pprMachOp_for_C MO_Dbl_Tan = text "tan"
689 pprMachOp_for_C MO_Dbl_Sinh = text "sinh"
690 pprMachOp_for_C MO_Dbl_Cosh = text "cosh"
691 pprMachOp_for_C MO_Dbl_Tanh = text "tanh"
692 pprMachOp_for_C MO_Dbl_Asin = text "asin"
693 pprMachOp_for_C MO_Dbl_Acos = text "acos"
694 pprMachOp_for_C MO_Dbl_Atan = text "atan"
695 pprMachOp_for_C MO_Dbl_Log = text "log"
696 pprMachOp_for_C MO_Dbl_Exp = text "exp"
697 pprMachOp_for_C MO_Dbl_Sqrt = text "sqrt"
698 pprMachOp_for_C MO_Dbl_Neg = text "-"
700 pprMachOp_for_C MO_Flt_Add = text "+"
701 pprMachOp_for_C MO_Flt_Sub = text "-"
702 pprMachOp_for_C MO_Flt_Mul = text "*"
703 pprMachOp_for_C MO_Flt_Div = text "/"
704 pprMachOp_for_C MO_Flt_Pwr = text "pow"
706 pprMachOp_for_C MO_Flt_Eq = text "=="
707 pprMachOp_for_C MO_Flt_Ne = text "!="
708 pprMachOp_for_C MO_Flt_Ge = text ">="
709 pprMachOp_for_C MO_Flt_Le = text "<="
710 pprMachOp_for_C MO_Flt_Gt = text ">"
711 pprMachOp_for_C MO_Flt_Lt = text "<"
713 pprMachOp_for_C MO_Flt_Sin = text "sin"
714 pprMachOp_for_C MO_Flt_Cos = text "cos"
715 pprMachOp_for_C MO_Flt_Tan = text "tan"
716 pprMachOp_for_C MO_Flt_Sinh = text "sinh"
717 pprMachOp_for_C MO_Flt_Cosh = text "cosh"
718 pprMachOp_for_C MO_Flt_Tanh = text "tanh"
719 pprMachOp_for_C MO_Flt_Asin = text "asin"
720 pprMachOp_for_C MO_Flt_Acos = text "acos"
721 pprMachOp_for_C MO_Flt_Atan = text "atan"
722 pprMachOp_for_C MO_Flt_Log = text "log"
723 pprMachOp_for_C MO_Flt_Exp = text "exp"
724 pprMachOp_for_C MO_Flt_Sqrt = text "sqrt"
725 pprMachOp_for_C MO_Flt_Neg = text "-"
727 pprMachOp_for_C MO_32U_to_NatS = text "(StgInt)"
728 pprMachOp_for_C MO_NatS_to_32U = text "(StgWord32)"
730 pprMachOp_for_C MO_NatS_to_Dbl = text "(StgDouble)"
731 pprMachOp_for_C MO_Dbl_to_NatS = text "(StgInt)"
733 pprMachOp_for_C MO_NatS_to_Flt = text "(StgFloat)"
734 pprMachOp_for_C MO_Flt_to_NatS = text "(StgInt)"
736 pprMachOp_for_C MO_NatS_to_NatU = text "(StgWord)"
737 pprMachOp_for_C MO_NatU_to_NatS = text "(StgInt)"
739 pprMachOp_for_C MO_NatS_to_NatP = text "(void*)"
740 pprMachOp_for_C MO_NatP_to_NatS = text "(StgInt)"
741 pprMachOp_for_C MO_NatU_to_NatP = text "(void*)"
742 pprMachOp_for_C MO_NatP_to_NatU = text "(StgWord)"
744 pprMachOp_for_C MO_Dbl_to_Flt = text "(StgFloat)"
745 pprMachOp_for_C MO_Flt_to_Dbl = text "(StgDouble)"
747 pprMachOp_for_C MO_8S_to_NatS = text "(StgInt8)(StgInt)"
748 pprMachOp_for_C MO_16S_to_NatS = text "(StgInt16)(StgInt)"
749 pprMachOp_for_C MO_32S_to_NatS = text "(StgInt32)(StgInt)"
751 pprMachOp_for_C MO_8U_to_NatU = text "(StgWord8)(StgWord)"
752 pprMachOp_for_C MO_16U_to_NatU = text "(StgWord16)(StgWord)"
753 pprMachOp_for_C MO_32U_to_NatU = text "(StgWord32)(StgWord)"
755 pprMachOp_for_C MO_8U_to_32U = text "(StgWord32)"
756 pprMachOp_for_C MO_32U_to_8U = text "(StgWord8)"
758 pprMachOp_for_C (MO_ReadOSBI _ _) = panic "pprMachOp_for_C:MO_ReadOSBI"
759 pprMachOp_for_C (MO_WriteOSBI _ _) = panic "pprMachOp_for_C:MO_WriteOSBI"
762 -- Helper for printing array expressions.
763 ppr_array_expression offw scaleRep baseAmode indexAmode
766 -- ((char*)baseAmode) + offw*bytes_per_word + indexAmode*bytes_per_scaleRep
768 = let offb = parens (int offw <> char '*' <> text "sizeof(void*)")
769 indb = parens (parens (pprAmode indexAmode)
770 <> char '*' <> int (getPrimRepArrayElemSize scaleRep))
771 baseb = text "(char*)" <> parens (pprAmode baseAmode)
772 addr = parens baseb <+> char '+' <+> offb <+> char '+' <+> indb
774 char '*' <> parens (ppr scaleRep <> char '*') <> parens addr
778 = if (externallyVisibleCLabel lbl)
780 else ptext SLIT("static ")
782 -- Horrible macros for declaring the types and locality of labels (see
785 ppLocalnessMacro include_dyn_prefix clabel =
790 ClosureType -> ptext SLIT("C_")
791 CodeType -> ptext SLIT("F_")
792 InfoTblType -> ptext SLIT("I_")
793 ClosureTblType -> ptext SLIT("CP_")
794 DataType -> ptext SLIT("D_")
797 is_visible = externallyVisibleCLabel clabel
798 label_type = labelType clabel
801 | is_visible = char 'E'
802 | otherwise = char 'I'
805 | include_dyn_prefix && labelDynamic clabel = char 'D'
813 grab_non_void_amodes amodes
814 = filter non_void amodes
817 = case (getAmodeRep amode) of
823 ppr_maybe_vol_regs :: Maybe [MagicId] -> (SDoc, SDoc)
824 ppr_maybe_vol_regs Nothing
826 ppr_maybe_vol_regs (Just vrs)
827 = case ppr_vol_regs vrs of
829 -> (pp_basic_saves $$ saves,
830 pp_basic_restores $$ restores)
832 ppr_vol_regs :: [MagicId] -> (SDoc, SDoc)
834 ppr_vol_regs [] = (empty, empty)
835 ppr_vol_regs (VoidReg:rs) = ppr_vol_regs rs
837 = let pp_reg = case r of
838 VanillaReg pk n -> pprVanillaReg n
840 (more_saves, more_restores) = ppr_vol_regs rs
842 (($$) ((<>) (ptext SLIT("CALLER_SAVE_")) pp_reg) more_saves,
843 ($$) ((<>) (ptext SLIT("CALLER_RESTORE_")) pp_reg) more_restores)
845 -- pp_basic_{saves,restores}: The BaseReg, Sp, Su, Hp and
846 -- HpLim (see StgRegs.lh) may need to be saved/restored around CCalls,
847 -- depending on the platform. (The "volatile regs" stuff handles all
848 -- other registers.) Just be *sure* BaseReg is OK before trying to do
849 -- anything else. The correct sequence of saves&restores are
850 -- encoded by the CALLER_*_SYSTEM macros.
851 pp_basic_saves = ptext SLIT("CALLER_SAVE_SYSTEM")
852 pp_basic_restores = ptext SLIT("CALLER_RESTORE_SYSTEM")
856 pp_srt_info NoC_SRT = hcat [ int 0, comma,
859 pp_srt_info (C_SRT lbl off len) = hcat [ pprCLabel lbl, comma,
866 | labelDynamic lbl = text "DLL_SRT_ENTRY" <> parens (pprCLabel lbl)
867 | otherwise = char '&' <> pprCLabel lbl
872 = if opt_SccProfilingOn
874 else char '0' -- leave it out!
875 -- ---------------------------------------------------------------------------
876 -- Changes for GrAnSim:
877 -- draw costs for computation in head of if into both branches;
878 -- as no abstractC data structure is given for the head, one is constructed
879 -- guessing unknown values and fed into the costs function
880 -- ---------------------------------------------------------------------------
882 do_if_stmt discrim tag alt_code deflt c
884 cond = hcat [ pprAmode discrim
887 , pprAmode (CLit tag)
889 -- to be absolutely sure that none of the
890 -- conversion rules hit, e.g.,
892 -- minInt is different to (int)minInt
894 -- in C (when minInt is a number not a constant
895 -- expression which evaluates to it.)
898 MachInt _ -> ptext SLIT("(I_)")
903 (addrModeCosts discrim Rhs) c
905 ppr_if_stmt pp_pred then_part else_part discrim_costs c
907 hcat [text "if (", pp_pred, text ") {"],
908 nest 8 (pprAbsC then_part (c + discrim_costs +
909 (Cost (0, 2, 0, 0, 0)) +
911 (case nonemptyAbsC else_part of Nothing -> empty; Just _ -> text "} else {"),
912 nest 8 (pprAbsC else_part (c + discrim_costs +
913 (Cost (0, 1, 0, 0, 0)) +
916 {- Total costs = inherited costs (before if) + costs for accessing discrim
917 + costs for cond branch ( = (0, 1, 0, 0, 0) )
918 + costs for that alternative
922 Historical note: this used to be two separate cases -- one for `ccall'
923 and one for `casm'. To get round a potential limitation to only 10
924 arguments, the numbering of arguments in @process_casm@ was beefed up a
927 Some rough notes on generating code for @CCallOp@:
929 1) Evaluate all arguments and stuff them into registers. (done elsewhere)
930 2) Save any essential registers (heap, stack, etc).
932 ToDo: If stable pointers are in use, these must be saved in a place
933 where the runtime system can get at them so that the Stg world can
934 be restarted during the call.
936 3) Save any temporary registers that are currently in use.
937 4) Do the call, putting result into a local variable
938 5) Restore essential registers
939 6) Restore temporaries
941 (This happens after restoration of essential registers because we
942 might need the @Base@ register to access all the others correctly.)
944 Otherwise, copy local variable into result register.
946 8) If ccall (not casm), declare the function being called as extern so
947 that C knows if it returns anything other than an int.
950 { ResultType _ccall_result;
953 _ccall_result = f( args );
957 return_reg = _ccall_result;
961 Amendment to the above: if we can GC, we have to:
963 * make sure we save all our registers away where the garbage collector
965 * be sure that there are no live registers or we're in trouble.
966 (This can cause problems if you try something foolish like passing
967 an array or a foreign obj to a _ccall_GC_ thing.)
968 * increment/decrement the @inCCallGC@ counter before/after the call so
969 that the runtime check that PerformGC is being used sensibly will work.
972 pprFCall call@(CCall (CCallSpec target cconv safety)) uniq args results vol_regs
975 declare_local_vars, -- local var for *result*
976 vcat local_arg_decls,
978 process_casm local_vars pp_non_void_args call_str,
984 (pp_saves, pp_restores) = ppr_vol_regs vol_regs
985 ppr_uniq_token = text "tok_" <> ppr uniq
986 (pp_save_context, pp_restore_context)
987 | playSafe safety = ( text "{ I_" <+> ppr_uniq_token <>
988 text "; SUSPEND_THREAD" <> parens ppr_uniq_token <> semi
989 , text "RESUME_THREAD" <> parens ppr_uniq_token <> text ";}"
991 | otherwise = ( pp_basic_saves $$ pp_saves,
992 pp_basic_restores $$ pp_restores)
996 in ASSERT2 ( all non_void nvas, ppr call <+> hsep (map pprAmode args) )
998 -- the last argument will be the "I/O world" token (a VoidRep)
999 -- all others should be non-void
1002 let nvrs = grab_non_void_amodes results
1003 in ASSERT (listLengthCmp nvrs 1 /= GT) nvrs
1004 -- there will usually be two results: a (void) state which we
1005 -- should ignore and a (possibly void) result.
1007 (local_arg_decls, pp_non_void_args)
1008 = unzip [ ppr_casm_arg a i | (a,i) <- non_void_args `zip` [1..] ]
1010 (declare_local_vars, local_vars, assign_results)
1011 = ppr_casm_results non_void_results
1013 call_str = case target of
1014 CasmTarget str -> _UNPK_ str
1015 StaticTarget fn -> mk_ccall_str (pprCLabelString fn) ccall_args
1016 DynamicTarget -> mk_ccall_str dyn_fun (tail ccall_args)
1018 ccall_args = zipWith (\ _ i -> char '%' <> int i) non_void_args [0..]
1019 dyn_fun = parens (parens (ptext SLIT("_ccall_fun_ty") <> ppr uniq) <> text "%0")
1022 -- Remainder only used for ccall
1023 mk_ccall_str fun_name ccall_fun_args = showSDoc
1025 if null non_void_results
1028 lparen, fun_name, lparen,
1029 hcat (punctuate comma ccall_fun_args),
1034 If the argument is a heap object, we need to reach inside and pull out
1035 the bit the C world wants to see. The only heap objects which can be
1036 passed are @Array@s and @ByteArray@s.
1039 ppr_casm_arg :: CAddrMode -> Int -> (SDoc, SDoc)
1040 -- (a) decl and assignment, (b) local var to be used later
1042 ppr_casm_arg amode a_num
1044 a_kind = getAmodeRep amode
1045 pp_amode = pprAmode amode
1046 pp_kind = pprPrimKind a_kind
1048 local_var = (<>) (ptext SLIT("_ccall_arg")) (int a_num)
1050 (arg_type, pp_amode2)
1053 -- for array arguments, pass a pointer to the body of the array
1054 -- (PTRS_ARR_CTS skips over all the header nonsense)
1055 ArrayRep -> (pp_kind,
1056 hcat [ptext SLIT("PTRS_ARR_CTS"),char '(', pp_amode, rparen])
1057 ByteArrayRep -> (pp_kind,
1058 hcat [ptext SLIT("BYTE_ARR_CTS"),char '(', pp_amode, rparen])
1060 -- for ForeignObj, use FOREIGN_OBJ_DATA to fish out the contents.
1061 ForeignObjRep -> (pp_kind,
1062 hcat [ptext SLIT("ForeignObj_CLOSURE_DATA"),
1063 char '(', pp_amode, char ')'])
1065 other -> (pp_kind, pp_amode)
1068 = hcat [ arg_type, space, local_var, equals, pp_amode2, semi ]
1070 (declare_local_var, local_var)
1073 For l-values, the critical questions are:
1075 1) Are there any results at all?
1077 We only allow zero or one results.
1081 :: [CAddrMode] -- list of results (length <= 1)
1083 ( SDoc, -- declaration of any local vars
1084 [SDoc], -- list of result vars (same length as results)
1085 SDoc ) -- assignment (if any) of results in local var to registers
1088 = (empty, [], empty) -- no results
1090 ppr_casm_results [r]
1092 result_reg = ppr_amode r
1093 r_kind = getAmodeRep r
1095 local_var = ptext SLIT("_ccall_result")
1097 (result_type, assign_result)
1098 = (pprPrimKind r_kind,
1099 hcat [ result_reg, equals, local_var, semi ])
1101 declare_local_var = hcat [ result_type, space, local_var, semi ]
1103 (declare_local_var, [local_var], assign_result)
1106 = panic "ppr_casm_results: ccall/casm with many results"
1110 Note the sneaky way _the_ result is represented by a list so that we
1111 can complain if it's used twice.
1113 ToDo: Any chance of giving line numbers when process-casm fails?
1114 Or maybe we should do a check _much earlier_ in compiler. ADR
1117 process_casm :: [SDoc] -- results (length <= 1)
1118 -> [SDoc] -- arguments
1119 -> String -- format string (with embedded %'s)
1120 -> SDoc -- code being generated
1122 process_casm results args string = process results args string
1124 process [] _ "" = empty
1125 process (_:_) _ "" = error ("process_casm: non-void result not assigned while processing _casm_ \"" ++
1127 "\"\n(Try changing result type to IO ()\n")
1129 process ress args ('%':cs)
1132 error ("process_casm: lonely % while processing _casm_ \"" ++ string ++ "\".\n")
1135 char '%' <> process ress args css
1139 [] -> error ("process_casm: no result to match %r while processing _casm_ \"" ++ string ++ "\".\nTry deleting %r or changing result type from PrimIO ()\n")
1140 [r] -> r <> (process [] args css)
1141 _ -> panic ("process_casm: casm with many results while processing _casm_ \"" ++ string ++ "\".\n")
1145 read_int :: ReadS Int
1148 case (read_int other) of
1150 if num >= 0 && args `lengthExceeds` num
1151 then parens (args !! num) <> process ress args css
1152 else error ("process_casm: no such arg #:"++(show num)++" while processing \"" ++ string ++ "\".\n")
1153 _ -> error ("process_casm: not %<num> while processing _casm_ \"" ++ string ++ "\".\n")
1155 process ress args (other_c:cs)
1156 = char other_c <> process ress args cs
1159 %************************************************************************
1161 \subsection[a2r-assignments]{Assignments}
1163 %************************************************************************
1165 Printing assignments is a little tricky because of type coercion.
1167 First of all, the kind of the thing being assigned can be gotten from
1168 the destination addressing mode. (It should be the same as the kind
1169 of the source addressing mode.) If the kind of the assignment is of
1170 @VoidRep@, then don't generate any code at all.
1173 pprAssign :: PrimRep -> CAddrMode -> CAddrMode -> SDoc
1175 pprAssign VoidRep dest src = empty
1178 Special treatment for floats and doubles, to avoid unwanted conversions.
1181 pprAssign FloatRep dest@(CVal reg_rel _) src
1182 = hcat [ ptext SLIT("ASSIGN_FLT"),char '(', ppr_amode (CAddr reg_rel), comma, pprAmode src, pp_paren_semi ]
1184 pprAssign DoubleRep dest@(CVal reg_rel _) src
1185 = hcat [ ptext SLIT("ASSIGN_DBL"),char '(', ppr_amode (CAddr reg_rel), comma, pprAmode src, pp_paren_semi ]
1187 pprAssign Int64Rep dest@(CVal reg_rel _) src
1188 = hcat [ ptext SLIT("ASSIGN_Int64"),char '(', ppr_amode (CAddr reg_rel), comma, pprAmode src, pp_paren_semi ]
1189 pprAssign Word64Rep dest@(CVal reg_rel _) src
1190 = hcat [ ptext SLIT("ASSIGN_Word64"),char '(', ppr_amode (CAddr reg_rel), comma, pprAmode src, pp_paren_semi ]
1193 Lastly, the question is: will the C compiler think the types of the
1194 two sides of the assignment match?
1196 We assume that the types will match if neither side is a
1197 @CVal@ addressing mode for any register which can point into
1200 Why? Because the heap and stack are used to store miscellaneous
1201 things, whereas the temporaries, registers, etc., are only used for
1202 things of fixed type.
1205 pprAssign kind (CReg (VanillaReg _ dest)) (CReg (VanillaReg _ src))
1206 = hcat [ pprVanillaReg dest, equals,
1207 pprVanillaReg src, semi ]
1209 pprAssign kind dest src
1210 | mixedTypeLocn dest
1211 -- Add in a cast to StgWord (a.k.a. W_) iff the destination is mixed
1212 = hcat [ ppr_amode dest, equals,
1213 text "(W_)(", -- Here is the cast
1214 ppr_amode src, pp_paren_semi ]
1216 pprAssign kind dest src
1217 | mixedPtrLocn dest && getAmodeRep src /= PtrRep
1218 -- Add in a cast to StgPtr (a.k.a. P_) iff the destination is mixed
1219 = hcat [ ppr_amode dest, equals,
1220 text "(P_)(", -- Here is the cast
1221 ppr_amode src, pp_paren_semi ]
1223 pprAssign ByteArrayRep dest src
1225 -- Add in a cast iff the source is mixed
1226 = hcat [ ppr_amode dest, equals,
1227 text "(StgByteArray)(", -- Here is the cast
1228 ppr_amode src, pp_paren_semi ]
1230 pprAssign kind other_dest src
1231 = hcat [ ppr_amode other_dest, equals,
1232 pprAmode src, semi ]
1236 %************************************************************************
1238 \subsection[a2r-CAddrModes]{Addressing modes}
1240 %************************************************************************
1242 @pprAmode@ is used to print r-values (which may need casts), whereas
1243 @ppr_amode@ is used for l-values {\em and} as a help function for
1247 pprAmode, ppr_amode :: CAddrMode -> SDoc
1250 For reasons discussed above under assignments, @CVal@ modes need
1251 to be treated carefully. First come special cases for floats and doubles,
1252 similar to those in @pprAssign@:
1254 (NB: @PK_FLT@ and @PK_DBL@ require the {\em address} of the value in
1258 pprAmode (CVal reg_rel FloatRep)
1259 = hcat [ text "PK_FLT(", ppr_amode (CAddr reg_rel), rparen ]
1260 pprAmode (CVal reg_rel DoubleRep)
1261 = hcat [ text "PK_DBL(", ppr_amode (CAddr reg_rel), rparen ]
1262 pprAmode (CVal reg_rel Int64Rep)
1263 = hcat [ text "PK_Int64(", ppr_amode (CAddr reg_rel), rparen ]
1264 pprAmode (CVal reg_rel Word64Rep)
1265 = hcat [ text "PK_Word64(", ppr_amode (CAddr reg_rel), rparen ]
1268 Next comes the case where there is some other cast need, and the
1273 | mixedTypeLocn amode
1274 = parens (hcat [ pprPrimKind (getAmodeRep amode), ptext SLIT(")("),
1276 | otherwise -- No cast needed
1280 When we have an indirection through a CIndex, we have to be careful to
1281 get the type casts right.
1285 CVal (CIndex kind1 base offset) kind2
1289 *(kind2 *)((kind1 *)base + offset)
1291 That is, the indexing is done in units of kind1, but the resulting
1295 ppr_amode CBytesPerWord
1296 = text "(sizeof(void*))"
1298 ppr_amode (CMem rep addr)
1299 = let txt_rep = pprPrimKind rep
1300 in hcat [ char '*', parens (txt_rep <> char '*'), parens (ppr_amode addr) ]
1302 ppr_amode (CVal reg_rel@(CIndex _ _ _) kind)
1303 = case (pprRegRelative False{-no sign wanted-} reg_rel) of
1304 (pp_reg, Nothing) -> panic "ppr_amode: CIndex"
1305 (pp_reg, Just offset) ->
1306 hcat [ char '*', parens (pprPrimKind kind <> char '*'),
1307 parens (pp_reg <> char '+' <> offset) ]
1310 Now the rest of the cases for ``workhorse'' @ppr_amode@:
1313 ppr_amode (CVal reg_rel _)
1314 = case (pprRegRelative False{-no sign wanted-} reg_rel) of
1315 (pp_reg, Nothing) -> (<>) (char '*') pp_reg
1316 (pp_reg, Just offset) -> hcat [ pp_reg, brackets offset ]
1318 ppr_amode (CAddr reg_rel)
1319 = case (pprRegRelative True{-sign wanted-} reg_rel) of
1320 (pp_reg, Nothing) -> pp_reg
1321 (pp_reg, Just offset) -> (<>) pp_reg offset
1323 ppr_amode (CReg magic_id) = pprMagicId magic_id
1325 ppr_amode (CTemp uniq kind) = char '_' <> pprUnique uniq <> char '_'
1327 ppr_amode (CLbl lbl kind) = pprCLabelAddr lbl
1329 ppr_amode (CCharLike ch)
1330 = hcat [ptext SLIT("CHARLIKE_CLOSURE"), char '(', pprAmode ch, rparen ]
1331 ppr_amode (CIntLike int)
1332 = hcat [ptext SLIT("INTLIKE_CLOSURE"), char '(', pprAmode int, rparen ]
1334 ppr_amode (CLit lit) = pprBasicLit lit
1336 ppr_amode (CJoinPoint _)
1337 = panic "ppr_amode: CJoinPoint"
1339 ppr_amode (CMacroExpr pk macro as)
1340 = parens (ptext (cExprMacroText macro) <>
1341 parens (hcat (punctuate comma (map pprAmode as))))
1345 cExprMacroText ENTRY_CODE = SLIT("ENTRY_CODE")
1346 cExprMacroText ARG_TAG = SLIT("ARG_TAG")
1347 cExprMacroText GET_TAG = SLIT("GET_TAG")
1348 cExprMacroText UPD_FRAME_UPDATEE = SLIT("UPD_FRAME_UPDATEE")
1349 cExprMacroText CCS_HDR = SLIT("CCS_HDR")
1351 cStmtMacroText ARGS_CHK = SLIT("ARGS_CHK")
1352 cStmtMacroText ARGS_CHK_LOAD_NODE = SLIT("ARGS_CHK_LOAD_NODE")
1353 cStmtMacroText UPD_CAF = SLIT("UPD_CAF")
1354 cStmtMacroText UPD_BH_UPDATABLE = SLIT("UPD_BH_UPDATABLE")
1355 cStmtMacroText UPD_BH_SINGLE_ENTRY = SLIT("UPD_BH_SINGLE_ENTRY")
1356 cStmtMacroText PUSH_UPD_FRAME = SLIT("PUSH_UPD_FRAME")
1357 cStmtMacroText PUSH_SEQ_FRAME = SLIT("PUSH_SEQ_FRAME")
1358 cStmtMacroText UPDATE_SU_FROM_UPD_FRAME = SLIT("UPDATE_SU_FROM_UPD_FRAME")
1359 cStmtMacroText SET_TAG = SLIT("SET_TAG")
1360 cStmtMacroText REGISTER_FOREIGN_EXPORT = SLIT("REGISTER_FOREIGN_EXPORT")
1361 cStmtMacroText REGISTER_IMPORT = SLIT("REGISTER_IMPORT")
1362 cStmtMacroText REGISTER_DIMPORT = SLIT("REGISTER_DIMPORT")
1363 cStmtMacroText GRAN_FETCH = SLIT("GRAN_FETCH")
1364 cStmtMacroText GRAN_RESCHEDULE = SLIT("GRAN_RESCHEDULE")
1365 cStmtMacroText GRAN_FETCH_AND_RESCHEDULE= SLIT("GRAN_FETCH_AND_RESCHEDULE")
1366 cStmtMacroText THREAD_CONTEXT_SWITCH = SLIT("THREAD_CONTEXT_SWITCH")
1367 cStmtMacroText GRAN_YIELD = SLIT("GRAN_YIELD")
1369 cCheckMacroText HP_CHK_NP = SLIT("HP_CHK_NP")
1370 cCheckMacroText STK_CHK_NP = SLIT("STK_CHK_NP")
1371 cCheckMacroText HP_STK_CHK_NP = SLIT("HP_STK_CHK_NP")
1372 cCheckMacroText HP_CHK_SEQ_NP = SLIT("HP_CHK_SEQ_NP")
1373 cCheckMacroText HP_CHK = SLIT("HP_CHK")
1374 cCheckMacroText STK_CHK = SLIT("STK_CHK")
1375 cCheckMacroText HP_STK_CHK = SLIT("HP_STK_CHK")
1376 cCheckMacroText HP_CHK_NOREGS = SLIT("HP_CHK_NOREGS")
1377 cCheckMacroText HP_CHK_UNPT_R1 = SLIT("HP_CHK_UNPT_R1")
1378 cCheckMacroText HP_CHK_UNBX_R1 = SLIT("HP_CHK_UNBX_R1")
1379 cCheckMacroText HP_CHK_F1 = SLIT("HP_CHK_F1")
1380 cCheckMacroText HP_CHK_D1 = SLIT("HP_CHK_D1")
1381 cCheckMacroText HP_CHK_L1 = SLIT("HP_CHK_L1")
1382 cCheckMacroText HP_CHK_UT_ALT = SLIT("HP_CHK_UT_ALT")
1383 cCheckMacroText HP_CHK_GEN = SLIT("HP_CHK_GEN")
1389 %************************************************************************
1391 \subsection[ppr-liveness-masks]{Liveness Masks}
1393 %************************************************************************
1396 pp_bitmap_switch :: [BitSet] -> SDoc -> SDoc -> SDoc
1397 pp_bitmap_switch ([ ]) small large = small
1398 pp_bitmap_switch ([_ ]) small large = small
1399 pp_bitmap_switch ([_,_]) small large = hcat
1400 [ptext SLIT("BITMAP_SWITCH64"), lparen, small, comma, large, rparen]
1401 pp_bitmap_switch (_ ) small large = large
1403 pp_liveness_switch :: Liveness -> SDoc -> SDoc -> SDoc
1404 pp_liveness_switch (Liveness lbl mask) = pp_bitmap_switch mask
1406 pp_bitset :: BitSet -> SDoc
1408 | i < -1 = int (i + 1) <> text "-1"
1412 pp_bitmap :: [BitSet] -> SDoc
1413 pp_bitmap [] = int 0
1414 pp_bitmap ss = hcat (punctuate delayed_comma (bundle ss)) where
1415 delayed_comma = hcat [space, ptext SLIT("COMMA"), space]
1417 bundle [s] = [hcat bitmap32]
1418 where bitmap32 = [ptext SLIT("BITMAP32"), lparen,
1419 pp_bitset s, rparen]
1420 bundle (s1:s2:ss) = hcat bitmap64 : bundle ss
1421 where bitmap64 = [ptext SLIT("BITMAP64"), lparen,
1422 pp_bitset s1, comma, pp_bitset s2, rparen]
1424 pp_liveness :: Liveness -> SDoc
1425 pp_liveness (Liveness lbl mask)
1426 = pp_bitmap_switch mask (pp_bitmap mask) (char '&' <> pprCLabel lbl)
1429 %************************************************************************
1431 \subsection[a2r-MagicIds]{Magic ids}
1433 %************************************************************************
1435 @pprRegRelative@ returns a pair of the @Doc@ for the register
1436 (some casting may be required), and a @Maybe Doc@ for the offset
1437 (zero offset gives a @Nothing@).
1440 addPlusSign :: Bool -> SDoc -> SDoc
1441 addPlusSign False p = p
1442 addPlusSign True p = (<>) (char '+') p
1444 pprSignedInt :: Bool -> Int -> Maybe SDoc -- Nothing => 0
1445 pprSignedInt sign_wanted n
1446 = if n == 0 then Nothing else
1447 if n > 0 then Just (addPlusSign sign_wanted (int n))
1450 pprRegRelative :: Bool -- True <=> Print leading plus sign (if +ve)
1452 -> (SDoc, Maybe SDoc)
1454 pprRegRelative sign_wanted (SpRel off)
1455 = (pprMagicId Sp, pprSignedInt sign_wanted (I# off))
1457 pprRegRelative sign_wanted r@(HpRel o)
1458 = let pp_Hp = pprMagicId Hp; off = I# o
1463 (pp_Hp, Just ((<>) (char '-') (int off)))
1465 pprRegRelative sign_wanted (NodeRel o)
1466 = let pp_Node = pprMagicId node; off = I# o
1471 (pp_Node, Just (addPlusSign sign_wanted (int off)))
1473 pprRegRelative sign_wanted (CIndex base offset kind)
1474 = ( hcat [text "((", pprPrimKind kind, text " *)(", ppr_amode base, text "))"]
1475 , Just (hcat [if sign_wanted then char '+' else empty,
1476 text "(I_)(", ppr_amode offset, ptext SLIT(")")])
1480 @pprMagicId@ just prints the register name. @VanillaReg@ registers are
1481 represented by a discriminated union (@StgUnion@), so we use the @PrimRep@
1482 to select the union tag.
1485 pprMagicId :: MagicId -> SDoc
1487 pprMagicId BaseReg = ptext SLIT("BaseReg")
1488 pprMagicId (VanillaReg pk n)
1489 = hcat [ pprVanillaReg n, char '.',
1491 pprMagicId (FloatReg n) = ptext SLIT("F") <> int (I# n)
1492 pprMagicId (DoubleReg n) = ptext SLIT("D") <> int (I# n)
1493 pprMagicId (LongReg _ n) = ptext SLIT("L") <> int (I# n)
1494 pprMagicId Sp = ptext SLIT("Sp")
1495 pprMagicId Su = ptext SLIT("Su")
1496 pprMagicId SpLim = ptext SLIT("SpLim")
1497 pprMagicId Hp = ptext SLIT("Hp")
1498 pprMagicId HpLim = ptext SLIT("HpLim")
1499 pprMagicId CurCostCentre = ptext SLIT("CCCS")
1500 pprMagicId VoidReg = panic "pprMagicId:VoidReg!"
1502 pprVanillaReg :: Int# -> SDoc
1503 pprVanillaReg n = char 'R' <> int (I# n)
1505 pprUnionTag :: PrimRep -> SDoc
1507 pprUnionTag PtrRep = char 'p'
1508 pprUnionTag CodePtrRep = ptext SLIT("fp")
1509 pprUnionTag DataPtrRep = char 'd'
1510 pprUnionTag RetRep = char 'p'
1511 pprUnionTag CostCentreRep = panic "pprUnionTag:CostCentre?"
1513 pprUnionTag CharRep = char 'c'
1514 pprUnionTag Int8Rep = ptext SLIT("i8")
1515 pprUnionTag IntRep = char 'i'
1516 pprUnionTag WordRep = char 'w'
1517 pprUnionTag Int32Rep = char 'i'
1518 pprUnionTag Word32Rep = char 'w'
1519 pprUnionTag AddrRep = char 'a'
1520 pprUnionTag FloatRep = char 'f'
1521 pprUnionTag DoubleRep = panic "pprUnionTag:Double?"
1523 pprUnionTag StablePtrRep = char 'p'
1524 pprUnionTag StableNameRep = char 'p'
1525 pprUnionTag WeakPtrRep = char 'p'
1526 pprUnionTag ForeignObjRep = char 'p'
1527 pprUnionTag PrimPtrRep = char 'p'
1529 pprUnionTag ThreadIdRep = char 't'
1531 pprUnionTag ArrayRep = char 'p'
1532 pprUnionTag ByteArrayRep = char 'b'
1533 pprUnionTag BCORep = char 'p'
1535 pprUnionTag _ = panic "pprUnionTag:Odd kind"
1539 Find and print local and external declarations for a list of
1540 Abstract~C statements.
1542 pprTempAndExternDecls :: AbstractC -> (SDoc{-temps-}, SDoc{-externs-})
1543 pprTempAndExternDecls AbsCNop = (empty, empty)
1545 pprTempAndExternDecls (AbsCStmts stmt1 stmt2)
1546 = initTE (ppr_decls_AbsC stmt1 `thenTE` \ (t_p1, e_p1) ->
1547 ppr_decls_AbsC stmt2 `thenTE` \ (t_p2, e_p2) ->
1548 case (catMaybes [t_p1, t_p2]) of { real_temps ->
1549 case (catMaybes [e_p1, e_p2]) of { real_exts ->
1550 returnTE (vcat real_temps, vcat real_exts) }}
1553 pprTempAndExternDecls other_stmt
1554 = initTE (ppr_decls_AbsC other_stmt `thenTE` \ (maybe_t, maybe_e) ->
1565 pprBasicLit :: Literal -> SDoc
1566 pprPrimKind :: PrimRep -> SDoc
1568 pprBasicLit lit = ppr lit
1569 pprPrimKind k = ppr k
1573 %************************************************************************
1575 \subsection[a2r-monad]{Monadery}
1577 %************************************************************************
1579 We need some monadery to keep track of temps and externs we have already
1580 printed. This info must be threaded right through the Abstract~C, so
1581 it's most convenient to hide it in this monad.
1583 WDP 95/02: Switched from \tr{([Unique], [CLabel])} to
1584 \tr{(UniqSet, CLabelSet)}. Allegedly for efficiency.
1587 type CLabelSet = FiniteMap CLabel (){-any type will do-}
1588 emptyCLabelSet = emptyFM
1589 x `elementOfCLabelSet` labs
1590 = case (lookupFM labs x) of { Just _ -> True; Nothing -> False }
1592 addToCLabelSet set x = addToFM set x ()
1594 type TEenv = (UniqSet Unique, CLabelSet)
1596 type TeM result = TEenv -> (TEenv, result)
1598 initTE :: TeM a -> a
1600 = case sa (emptyUniqSet, emptyCLabelSet) of { (_, result) ->
1603 {-# INLINE thenTE #-}
1604 {-# INLINE returnTE #-}
1606 thenTE :: TeM a -> (a -> TeM b) -> TeM b
1608 = case a u of { (u_1, result_of_a) ->
1611 mapTE :: (a -> TeM b) -> [a] -> TeM [b]
1612 mapTE f [] = returnTE []
1614 = f x `thenTE` \ r ->
1615 mapTE f xs `thenTE` \ rs ->
1618 returnTE :: a -> TeM a
1619 returnTE result env = (env, result)
1621 -- these next two check whether the thing is already
1622 -- recorded, and THEN THEY RECORD IT
1623 -- (subsequent calls will return False for the same uniq/label)
1625 tempSeenTE :: Unique -> TeM Bool
1626 tempSeenTE uniq env@(seen_uniqs, seen_labels)
1627 = if (uniq `elementOfUniqSet` seen_uniqs)
1629 else ((addOneToUniqSet seen_uniqs uniq,
1633 labelSeenTE :: CLabel -> TeM Bool
1634 labelSeenTE lbl env@(seen_uniqs, seen_labels)
1635 = if (lbl `elementOfCLabelSet` seen_labels)
1638 addToCLabelSet seen_labels lbl),
1643 pprTempDecl :: Unique -> PrimRep -> SDoc
1644 pprTempDecl uniq kind
1645 = hcat [ pprPrimKind kind, space, char '_', pprUnique uniq, ptext SLIT("_;") ]
1647 pprExternDecl :: Bool -> CLabel -> SDoc
1648 pprExternDecl in_srt clabel
1649 | not (needsCDecl clabel) = empty -- do not print anything for "known external" things
1651 hcat [ ppLocalnessMacro (not in_srt) clabel,
1652 lparen, dyn_wrapper (pprCLabel clabel), pp_paren_semi ]
1655 | in_srt && labelDynamic clabel = text "DLL_IMPORT_DATA_VAR" <> parens d
1661 ppr_decls_AbsC :: AbstractC -> TeM (Maybe SDoc{-temps-}, Maybe SDoc{-externs-})
1663 ppr_decls_AbsC AbsCNop = returnTE (Nothing, Nothing)
1665 ppr_decls_AbsC (AbsCStmts stmts_1 stmts_2)
1666 = ppr_decls_AbsC stmts_1 `thenTE` \ p1 ->
1667 ppr_decls_AbsC stmts_2 `thenTE` \ p2 ->
1668 returnTE (maybe_vcat [p1, p2])
1670 ppr_decls_AbsC (CSplitMarker) = returnTE (Nothing, Nothing)
1672 ppr_decls_AbsC (CAssign dest source)
1673 = ppr_decls_Amode dest `thenTE` \ p1 ->
1674 ppr_decls_Amode source `thenTE` \ p2 ->
1675 returnTE (maybe_vcat [p1, p2])
1677 ppr_decls_AbsC (CJump target) = ppr_decls_Amode target
1679 ppr_decls_AbsC (CFallThrough target) = ppr_decls_Amode target
1681 ppr_decls_AbsC (CReturn target _) = ppr_decls_Amode target
1683 ppr_decls_AbsC (CSwitch discrim alts deflt)
1684 = ppr_decls_Amode discrim `thenTE` \ pdisc ->
1685 mapTE ppr_alt_stuff alts `thenTE` \ palts ->
1686 ppr_decls_AbsC deflt `thenTE` \ pdeflt ->
1687 returnTE (maybe_vcat (pdisc:pdeflt:palts))
1689 ppr_alt_stuff (_, absC) = ppr_decls_AbsC absC
1691 ppr_decls_AbsC (CCodeBlock lbl absC)
1692 = ppr_decls_AbsC absC
1694 ppr_decls_AbsC (CInitHdr cl_info reg_rel cost_centre _)
1695 -- ToDo: strictly speaking, should chk "cost_centre" amode
1696 = labelSeenTE info_lbl `thenTE` \ label_seen ->
1701 Just (pprExternDecl False{-not in an SRT decl-} info_lbl))
1703 info_lbl = infoTableLabelFromCI cl_info
1705 ppr_decls_AbsC (CMachOpStmt res _ args _) = ppr_decls_Amodes (maybeToList res ++ args)
1706 ppr_decls_AbsC (COpStmt results _ args _) = ppr_decls_Amodes (results ++ args)
1708 ppr_decls_AbsC (CSimultaneous abc) = ppr_decls_AbsC abc
1710 ppr_decls_AbsC (CSequential abcs)
1711 = mapTE ppr_decls_AbsC abcs `thenTE` \ t_and_e_s ->
1712 returnTE (maybe_vcat t_and_e_s)
1714 ppr_decls_AbsC (CCheck _ amodes code) =
1715 ppr_decls_Amodes amodes `thenTE` \p1 ->
1716 ppr_decls_AbsC code `thenTE` \p2 ->
1717 returnTE (maybe_vcat [p1,p2])
1719 ppr_decls_AbsC (CMacroStmt _ amodes) = ppr_decls_Amodes amodes
1721 ppr_decls_AbsC (CCallProfCtrMacro _ amodes) = ppr_decls_Amodes [] -- *****!!!
1722 -- you get some nasty re-decls of stdio.h if you compile
1723 -- the prelude while looking inside those amodes;
1724 -- no real reason to, anyway.
1725 ppr_decls_AbsC (CCallProfCCMacro _ amodes) = ppr_decls_Amodes amodes
1727 ppr_decls_AbsC (CStaticClosure closure_info cost_centre amodes)
1728 -- ToDo: strictly speaking, should chk "cost_centre" amode
1729 = ppr_decls_Amodes amodes
1731 ppr_decls_AbsC (CClosureInfoAndCode cl_info slow maybe_fast _)
1732 = ppr_decls_Amodes [entry_lbl] `thenTE` \ p1 ->
1733 ppr_decls_AbsC slow `thenTE` \ p2 ->
1735 Nothing -> returnTE (Nothing, Nothing)
1736 Just fast -> ppr_decls_AbsC fast) `thenTE` \ p3 ->
1737 returnTE (maybe_vcat [p1, p2, p3])
1739 entry_lbl = CLbl slow_lbl CodePtrRep
1740 slow_lbl = case (nonemptyAbsC slow) of
1741 Nothing -> mkErrorStdEntryLabel
1742 Just _ -> entryLabelFromCI cl_info
1744 ppr_decls_AbsC (CSRT _ closure_lbls)
1745 = mapTE labelSeenTE closure_lbls `thenTE` \ seen ->
1747 if and seen then Nothing
1748 else Just (vcat [ pprExternDecl True{-in SRT decl-} l
1749 | (l,False) <- zip closure_lbls seen ]))
1751 ppr_decls_AbsC (CRetDirect _ code _ _) = ppr_decls_AbsC code
1752 ppr_decls_AbsC (CRetVector _ amodes _ _) = ppr_decls_Amodes amodes
1753 ppr_decls_AbsC (CModuleInitBlock _ code) = ppr_decls_AbsC code
1755 ppr_decls_AbsC (_) = returnTE (Nothing, Nothing)
1759 ppr_decls_Amode :: CAddrMode -> TeM (Maybe SDoc, Maybe SDoc)
1760 ppr_decls_Amode (CVal (CIndex base offset _) _) = ppr_decls_Amodes [base,offset]
1761 ppr_decls_Amode (CAddr (CIndex base offset _)) = ppr_decls_Amodes [base,offset]
1762 ppr_decls_Amode (CVal _ _) = returnTE (Nothing, Nothing)
1763 ppr_decls_Amode (CAddr _) = returnTE (Nothing, Nothing)
1764 ppr_decls_Amode (CReg _) = returnTE (Nothing, Nothing)
1765 ppr_decls_Amode (CLit _) = returnTE (Nothing, Nothing)
1767 -- CIntLike must be a literal -- no decls
1768 ppr_decls_Amode (CIntLike int) = returnTE (Nothing, Nothing)
1771 ppr_decls_Amode (CCharLike char) = returnTE (Nothing, Nothing)
1773 -- now, the only place where we actually print temps/externs...
1774 ppr_decls_Amode (CTemp uniq kind)
1776 VoidRep -> returnTE (Nothing, Nothing)
1778 tempSeenTE uniq `thenTE` \ temp_seen ->
1780 (if temp_seen then Nothing else Just (pprTempDecl uniq kind), Nothing)
1782 ppr_decls_Amode (CLbl lbl VoidRep)
1783 = returnTE (Nothing, Nothing)
1785 ppr_decls_Amode (CLbl lbl kind)
1786 = labelSeenTE lbl `thenTE` \ label_seen ->
1788 if label_seen then Nothing else Just (pprExternDecl False{-not in an SRT decl-} lbl))
1790 ppr_decls_Amode (CMacroExpr _ _ amodes)
1791 = ppr_decls_Amodes amodes
1793 ppr_decls_Amode other = returnTE (Nothing, Nothing)
1796 maybe_vcat :: [(Maybe SDoc, Maybe SDoc)] -> (Maybe SDoc, Maybe SDoc)
1798 = case (unzip ps) of { (ts, es) ->
1799 case (catMaybes ts) of { real_ts ->
1800 case (catMaybes es) of { real_es ->
1801 (if (null real_ts) then Nothing else Just (vcat real_ts),
1802 if (null real_es) then Nothing else Just (vcat real_es))
1807 ppr_decls_Amodes :: [CAddrMode] -> TeM (Maybe SDoc, Maybe SDoc)
1808 ppr_decls_Amodes amodes
1809 = mapTE ppr_decls_Amode amodes `thenTE` \ ps ->
1810 returnTE ( maybe_vcat ps )
1813 Print out a C Label where you want the *address* of the label, not the
1814 object it refers to. The distinction is important when the label may
1815 refer to a C structure (info tables and closures, for instance).
1817 When just generating a declaration for the label, use pprCLabel.
1820 pprCLabelAddr :: CLabel -> SDoc
1821 pprCLabelAddr clabel =
1822 case labelType clabel of
1823 InfoTblType -> addr_of_label
1824 ClosureType -> addr_of_label
1825 VecTblType -> addr_of_label
1828 addr_of_label = ptext SLIT("(P_)&") <> pp_label
1829 pp_label = pprCLabel clabel
1833 -----------------------------------------------------------------------------
1834 Initialising static objects with floating-point numbers. We can't
1835 just emit the floating point number, because C will cast it to an int
1836 by rounding it. We want the actual bit-representation of the float.
1838 This is a hack to turn the floating point numbers into ints that we
1839 can safely initialise to static locations.
1842 big_doubles = (getPrimRepSize DoubleRep) /= 1
1844 -- floatss are always 1 word
1845 floatToWord :: CAddrMode -> CAddrMode
1846 floatToWord (CLit (MachFloat r))
1848 arr <- newFloatArray ((0::Int),0)
1849 writeFloatArray arr 0 (fromRational r)
1850 i <- readIntArray arr 0
1851 return (CLit (MachInt (toInteger i)))
1854 doubleToWords :: CAddrMode -> [CAddrMode]
1855 doubleToWords (CLit (MachDouble r))
1856 | big_doubles -- doubles are 2 words
1858 arr <- newDoubleArray ((0::Int),1)
1859 writeDoubleArray arr 0 (fromRational r)
1860 i1 <- readIntArray arr 0
1861 i2 <- readIntArray arr 1
1862 return [ CLit (MachInt (toInteger i1))
1863 , CLit (MachInt (toInteger i2))
1866 | otherwise -- doubles are 1 word
1868 arr <- newDoubleArray ((0::Int),0)
1869 writeDoubleArray arr 0 (fromRational r)
1870 i <- readIntArray arr 0
1871 return [ CLit (MachInt (toInteger i)) ]