2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 %************************************************************************
6 \section[PprAbsC]{Pretty-printing Abstract~C}
8 %************************************************************************
18 #include "HsVersions.h"
24 import AbsCUtils ( getAmodeRep, nonemptyAbsC,
25 mixedPtrLocn, mixedTypeLocn
28 import Constants ( mIN_UPD_SIZE )
29 import CallConv ( CallConv, callConvAttribute )
30 import CLabel ( externallyVisibleCLabel, mkErrorStdEntryLabel,
31 needsCDecl, pprCLabel,
32 mkReturnInfoLabel, mkReturnPtLabel, mkClosureTblLabel,
34 CLabel, CLabelType(..), labelType, labelDynamic
37 import CmdLineOpts ( opt_SccProfilingOn, opt_EmitCExternDecls, opt_GranMacros )
38 import CostCentre ( pprCostCentreDecl, pprCostCentreStackDecl )
40 import Costs ( costs, addrModeCosts, CostRes(..), Side(..) )
41 import CStrings ( stringToC, pprCLabelString )
42 import FiniteMap ( addToFM, emptyFM, lookupFM, FiniteMap )
43 import Literal ( Literal(..) )
44 import TyCon ( tyConDataCons )
45 import Name ( NamedThing(..) )
46 import DataCon ( DataCon{-instance NamedThing-}, dataConWrapId )
47 import Maybes ( maybeToBool, catMaybes )
48 import PrimOp ( primOpNeedsWrapper, pprPrimOp, pprCCallOp,
49 PrimOp(..), CCall(..), CCallTarget(..) )
50 import PrimRep ( isFloatingRep, PrimRep(..), getPrimRepSize, showPrimRep )
51 import SMRep ( pprSMRep )
52 import Unique ( pprUnique, Unique{-instance NamedThing-} )
53 import UniqSet ( emptyUniqSet, elementOfUniqSet,
54 addOneToUniqSet, UniqSet
56 import StgSyn ( SRT(..) )
57 import BitSet ( intBS )
59 import Util ( nOfThem )
68 For spitting out the costs of an abstract~C expression, @writeRealC@
69 now not only prints the C~code of the @absC@ arg but also adds a macro
70 call to a cost evaluation function @GRAN_EXEC@. For that,
71 @pprAbsC@ has a new ``costs'' argument. %% HWL
75 writeRealC :: Handle -> AbstractC -> IO ()
76 writeRealC handle absC
77 -- avoid holding on to the whole of absC in the !Gransim case.
79 then printForCFast fp (pprAbsC absC (costs absC))
80 else printForCFast fp (pprAbsC absC (panic "costs"))
81 --printForC handle (pprAbsC absC (panic "costs"))
82 dumpRealC :: AbstractC -> SDoc
83 dumpRealC absC = pprAbsC absC (costs absC)
86 writeRealC :: Handle -> AbstractC -> IO ()
87 --writeRealC handle absC =
89 -- printDoc LeftMode handle (pprAbsC absC (costs absC))
91 writeRealC handle absC
92 | opt_GranMacros = _scc_ "writeRealC" printForC handle $
93 pprCode CStyle (pprAbsC absC (costs absC))
94 | otherwise = _scc_ "writeRealC" printForC handle $
95 pprCode CStyle (pprAbsC absC (panic "costs"))
97 dumpRealC :: AbstractC -> SDoc
99 | opt_GranMacros = pprCode CStyle (pprAbsC absC (costs absC))
100 | otherwise = pprCode CStyle (pprAbsC absC (panic "costs"))
104 This emits the macro, which is used in GrAnSim to compute the total costs
105 from a cost 5 tuple. %% HWL
108 emitMacro :: CostRes -> SDoc
110 emitMacro _ | not opt_GranMacros = empty
112 emitMacro (Cost (i,b,l,s,f))
113 = hcat [ ptext SLIT("GRAN_EXEC"), char '(',
114 int i, comma, int b, comma, int l, comma,
115 int s, comma, int f, pp_paren_semi ]
117 pp_paren_semi = text ");"
120 New type: Now pprAbsC also takes the costs for evaluating the Abstract C
121 code as an argument (that's needed when spitting out the GRAN_EXEC macro
122 which must be done before the return i.e. inside absC code) HWL
125 pprAbsC :: AbstractC -> CostRes -> SDoc
126 pprAbsC AbsCNop _ = empty
127 pprAbsC (AbsCStmts s1 s2) c = ($$) (pprAbsC s1 c) (pprAbsC s2 c)
129 pprAbsC (CAssign dest src) _ = pprAssign (getAmodeRep dest) dest src
131 pprAbsC (CJump target) c
132 = ($$) (hcat [emitMacro c {-WDP:, text "/* <--++ CJump */"-} ])
133 (hcat [ text jmp_lit, pprAmode target, pp_paren_semi ])
135 pprAbsC (CFallThrough target) c
136 = ($$) (hcat [emitMacro c {-WDP:, text "/* <--++ CFallThrough */"-} ])
137 (hcat [ text jmp_lit, pprAmode target, pp_paren_semi ])
139 -- --------------------------------------------------------------------------
140 -- Spit out GRAN_EXEC macro immediately before the return HWL
142 pprAbsC (CReturn am return_info) c
143 = ($$) (hcat [emitMacro c {-WDP:, text "/* <---- CReturn */"-} ])
144 (hcat [text jmp_lit, target, pp_paren_semi ])
146 target = case return_info of
147 DirectReturn -> hcat [ptext SLIT("ENTRY_CODE"), lparen,
149 DynamicVectoredReturn am' -> mk_vector (pprAmode am')
150 StaticVectoredReturn n -> mk_vector (int n) -- Always positive
151 mk_vector x = hcat [ptext SLIT("RET_VEC"), char '(', pprAmode am, comma,
154 pprAbsC (CSplitMarker) _ = ptext SLIT("/* SPLIT */")
156 -- we optimise various degenerate cases of CSwitches.
158 -- --------------------------------------------------------------------------
159 -- Assume: CSwitch is also end of basic block
160 -- costs function yields nullCosts for whole switch
161 -- ==> inherited costs c are those of basic block up to switch
162 -- ==> inherit c + costs for the corresponding branch
164 -- --------------------------------------------------------------------------
166 pprAbsC (CSwitch discrim [] deflt) c
167 = pprAbsC deflt (c + costs deflt)
168 -- Empty alternative list => no costs for discrim as nothing cond. here HWL
170 pprAbsC (CSwitch discrim [(tag,alt_code)] deflt) c -- only one alt
171 = case (nonemptyAbsC deflt) of
172 Nothing -> -- one alt and no default
173 pprAbsC alt_code (c + costs alt_code)
174 -- Nothing conditional in here either HWL
176 Just dc -> -- make it an "if"
177 do_if_stmt discrim tag alt_code dc c
179 -- What problem is the re-ordering trying to solve ?
180 pprAbsC (CSwitch discrim [(tag1@(MachInt i1), alt_code1),
181 (tag2@(MachInt i2), alt_code2)] deflt) c
182 | empty_deflt && ((i1 == 0 && i2 == 1) || (i1 == 1 && i2 == 0))
184 do_if_stmt discrim tag1 alt_code1 alt_code2 c
186 do_if_stmt discrim tag2 alt_code2 alt_code1 c
188 empty_deflt = not (maybeToBool (nonemptyAbsC deflt))
190 pprAbsC (CSwitch discrim alts deflt) c -- general case
191 | isFloatingRep (getAmodeRep discrim)
192 = pprAbsC (foldr ( \ a -> CSwitch discrim [a]) deflt alts) c
195 hcat [text "switch (", pp_discrim, text ") {"],
196 nest 2 (vcat (map ppr_alt alts)),
197 (case (nonemptyAbsC deflt) of
200 nest 2 (vcat [ptext SLIT("default:"),
201 pprAbsC dc (c + switch_head_cost
203 ptext SLIT("break;")])),
210 = vcat [ hcat [ptext SLIT("case "), pprBasicLit lit, char ':'],
211 nest 2 (($$) (pprAbsC absC (c + switch_head_cost + costs absC))
212 (ptext SLIT("break;"))) ]
214 -- Costs for addressing header of switch and cond. branching -- HWL
215 switch_head_cost = addrModeCosts discrim Rhs + (Cost (0, 1, 0, 0, 0))
217 pprAbsC stmt@(COpStmt results (CCallOp ccall) args vol_regs) _
218 = pprCCall ccall args results vol_regs
220 pprAbsC stmt@(COpStmt results op args vol_regs) _
222 non_void_args = grab_non_void_amodes args
223 non_void_results = grab_non_void_amodes results
224 -- if just one result, we print in the obvious "assignment" style;
225 -- if 0 or many results, we emit a macro call, w/ the results
226 -- followed by the arguments. The macro presumably knows which
229 the_op = ppr_op_call non_void_results non_void_args
230 -- liveness mask is *in* the non_void_args
232 if primOpNeedsWrapper op then
233 case (ppr_vol_regs vol_regs) of { (pp_saves, pp_restores) ->
242 ppr_op_call results args
243 = hcat [ pprPrimOp op, lparen,
244 hcat (punctuate comma (map ppr_op_result results)),
245 if null results || null args then empty else comma,
246 hcat (punctuate comma (map pprAmode args)),
249 ppr_op_result r = ppr_amode r
250 -- primop macros do their own casting of result;
251 -- hence we can toss the provided cast...
253 pprAbsC stmt@(CSRT lbl closures) c
254 = case (pprTempAndExternDecls stmt) of { (_, pp_exts) ->
256 $$ ptext SLIT("SRT") <> lparen <> pprCLabel lbl <> rparen
257 $$ nest 2 (hcat (punctuate comma (map pp_closure_lbl closures)))
261 pprAbsC stmt@(CBitmap lbl mask) c
263 hcat [ ptext SLIT("BITMAP"), lparen,
264 pprCLabel lbl, comma,
267 hcat (punctuate comma (map (int.intBS) mask)),
271 pprAbsC (CSimultaneous abs_c) c
272 = hcat [ptext SLIT("{{"), pprAbsC abs_c c, ptext SLIT("}}")]
274 pprAbsC (CCheck macro as code) c
275 = hcat [ptext (cCheckMacroText macro), lparen,
276 hcat (punctuate comma (map ppr_amode as)), comma,
277 pprAbsC code c, pp_paren_semi
279 pprAbsC (CMacroStmt macro as) _
280 = hcat [ptext (cStmtMacroText macro), lparen,
281 hcat (punctuate comma (map ppr_amode as)),pp_paren_semi] -- no casting
282 pprAbsC (CCallProfCtrMacro op as) _
283 = hcat [ptext op, lparen,
284 hcat (punctuate comma (map ppr_amode as)),pp_paren_semi]
285 pprAbsC (CCallProfCCMacro op as) _
286 = hcat [ptext op, lparen,
287 hcat (punctuate comma (map ppr_amode as)),pp_paren_semi]
288 pprAbsC stmt@(CCallTypedef is_tdef (CCall op_str is_asm may_gc cconv) results args) _
289 = hsep [ ptext (if is_tdef then SLIT("typedef") else SLIT("extern"))
292 , parens (hsep (punctuate comma ccall_decl_ty_args))
296 In the non-casm case, to ensure that we're entering the given external
297 entry point using the correct calling convention, we have to do the following:
299 - When entering via a function pointer (the `dynamic' case) using the specified
300 calling convention, we emit a typedefn declaration attributed with the
301 calling convention to use together with the result and parameter types we're
302 assuming. Coerce the function pointer to this type and go.
304 - to enter the function at a given code label, we emit an extern declaration
305 for the label here, stating the calling convention together with result and
306 argument types we're assuming.
308 The C compiler will hopefully use this extern declaration to good effect,
309 reporting any discrepancies between our extern decl and any other that
312 Re: calling convention, notice that gcc (2.8.1 and egcs-1.0.2) will for
313 the external function `foo' use the calling convention of the first `foo'
314 prototype it encounters (nor does it complain about conflicting attribute
315 declarations). The consequence of this is that you cannot override the
316 calling convention of `foo' using an extern declaration (you'd have to use
317 a typedef), but why you would want to do such a thing in the first place
318 is totally beyond me.
320 ToDo: petition the gcc folks to add code to warn about conflicting attribute
326 | is_tdef = parens (text (callConvAttribute cconv) <+> char '*' <> ccall_fun_ty)
327 | otherwise = text (callConvAttribute cconv) <+> ccall_fun_ty
331 DynamicTarget u -> ptext SLIT("_ccall_fun_ty") <> ppr u
332 StaticTarget x -> pprCLabelString x
335 case non_void_results of
336 [] -> ptext SLIT("void")
337 [amode] -> text (showPrimRep (getAmodeRep amode))
338 _ -> panic "pprAbsC{CCallTypedef}: ccall_res_ty"
341 | is_tdef = tail ccall_arg_tys
342 | otherwise = ccall_arg_tys
344 ccall_arg_tys = map (text.showPrimRep.getAmodeRep) non_void_args
346 -- the first argument will be the "I/O world" token (a VoidRep)
347 -- all others should be non-void
350 in ASSERT (all non_void nvas) nvas
352 -- there will usually be two results: a (void) state which we
353 -- should ignore and a (possibly void) result.
355 let nvrs = grab_non_void_amodes results
356 in ASSERT (length nvrs <= 1) nvrs
358 pprAbsC (CCodeBlock lbl abs_C) _
359 = if not (maybeToBool(nonemptyAbsC abs_C)) then
360 pprTrace "pprAbsC: curious empty code block for" (pprCLabel lbl) empty
362 case (pprTempAndExternDecls abs_C) of { (pp_temps, pp_exts) ->
365 hcat [text (if (externallyVisibleCLabel lbl)
366 then "FN_(" -- abbreviations to save on output
368 pprCLabel lbl, text ") {"],
372 nest 8 (ptext SLIT("FB_")),
373 nest 8 (pprAbsC abs_C (costs abs_C)),
374 nest 8 (ptext SLIT("FE_")),
380 pprAbsC (CInitHdr cl_info amode cost_centre) _
381 = hcat [ ptext SLIT("SET_HDR_"), char '(',
382 ppr_amode amode, comma,
383 pprCLabelAddr info_lbl, comma,
384 if_profiling (pprAmode cost_centre),
387 info_lbl = infoTableLabelFromCI cl_info
389 pprAbsC stmt@(CStaticClosure closure_lbl cl_info cost_centre amodes) _
390 = case (pprTempAndExternDecls stmt) of { (_, pp_exts) ->
394 ptext SLIT("SET_STATIC_HDR"), char '(',
395 pprCLabel closure_lbl, comma,
396 pprCLabel info_lbl, comma,
397 if_profiling (pprAmode cost_centre), comma,
398 ppLocalness closure_lbl, comma,
399 ppLocalnessMacro True{-include dyn-} info_lbl,
402 nest 2 (ppr_payload (amodes ++ padding_wds ++ static_link_field)),
406 info_lbl = infoTableLabelFromCI cl_info
408 ppr_payload [] = empty
409 ppr_payload ls = comma <+>
410 braces (hsep (punctuate comma (map ((text "(L_)" <>).ppr_item) ls)))
413 | rep == VoidRep = text "0" -- might not even need this...
414 | rep == FloatRep = ppr_amode (floatToWord item)
415 | rep == DoubleRep = hcat (punctuate (text ", (L_)")
416 (map ppr_amode (doubleToWords item)))
417 | otherwise = ppr_amode item
419 rep = getAmodeRep item
422 if not (closureUpdReqd cl_info) then
425 case max 0 (mIN_UPD_SIZE - length amodes) of { still_needed ->
426 nOfThem still_needed (mkIntCLit 0) } -- a bunch of 0s
429 | staticClosureNeedsLink cl_info = [mkIntCLit 0]
432 pprAbsC stmt@(CClosureInfoAndCode cl_info slow maybe_fast cl_descr) _
435 ptext SLIT("INFO_TABLE"),
436 ( if is_selector then
437 ptext SLIT("_SELECTOR")
438 else if is_constr then
439 ptext SLIT("_CONSTR")
440 else if needs_srt then
442 else empty ), char '(',
444 pprCLabel info_lbl, comma,
445 pprCLabel slow_lbl, comma,
446 pp_rest, {- ptrs,nptrs,[srt,]type,-} comma,
448 ppLocalness info_lbl, comma,
449 ppLocalnessMacro True{-include dyn-} slow_lbl, comma,
451 if_profiling pp_descr, comma,
452 if_profiling pp_type,
458 Just fast -> let stuff = CCodeBlock fast_lbl fast in
459 pprAbsC stuff (costs stuff)
462 info_lbl = infoTableLabelFromCI cl_info
463 fast_lbl = fastLabelFromCI cl_info
466 = case (nonemptyAbsC slow) of
467 Nothing -> (mkErrorStdEntryLabel, empty)
468 Just xx -> (entryLabelFromCI cl_info,
469 let stuff = CCodeBlock slow_lbl xx in
470 pprAbsC stuff (costs stuff))
472 maybe_selector = maybeSelectorInfo cl_info
473 is_selector = maybeToBool maybe_selector
474 (Just select_word_i) = maybe_selector
476 maybe_tag = closureSemiTag cl_info
477 is_constr = maybeToBool maybe_tag
478 (Just tag) = maybe_tag
480 needs_srt = infoTblNeedsSRT cl_info
481 srt = getSRTInfo cl_info
483 size = closureNonHdrSize cl_info
485 ptrs = closurePtrsSize cl_info
488 pp_rest | is_selector = int select_word_i
493 hcat [ int tag, comma ]
494 else if needs_srt then
499 type_str = pprSMRep (closureSMRep cl_info)
501 pp_descr = hcat [char '"', text (stringToC cl_descr), char '"']
502 pp_type = hcat [char '"', text (stringToC (closureTypeDescr cl_info)), char '"']
504 pprAbsC stmt@(CClosureTbl tycon) _
506 ptext SLIT("CLOSURE_TBL") <>
507 lparen <> pprCLabel (mkClosureTblLabel tycon) <> rparen :
509 map (pp_closure_lbl . mkClosureLabel . getName . dataConWrapId) (tyConDataCons tycon)
511 ) $$ ptext SLIT("};")
513 pprAbsC stmt@(CRetDirect uniq code srt liveness) _
516 ptext SLIT("INFO_TABLE_SRT_BITMAP"), lparen,
517 pprCLabel info_lbl, comma,
518 pprCLabel entry_lbl, comma,
519 pp_liveness liveness, comma, -- bitmap
520 pp_srt_info srt, -- SRT
521 ptext type_str, comma, -- closure type
522 ppLocalness info_lbl, comma, -- info table storage class
523 ppLocalnessMacro True{-include dyn-} entry_lbl, comma, -- entry pt storage class
530 info_lbl = mkReturnInfoLabel uniq
531 entry_lbl = mkReturnPtLabel uniq
533 pp_code = let stuff = CCodeBlock entry_lbl code in
534 pprAbsC stuff (costs stuff)
536 type_str = case liveness of
537 LvSmall _ -> SLIT("RET_SMALL")
538 LvLarge _ -> SLIT("RET_BIG")
540 pprAbsC stmt@(CRetVector lbl amodes srt liveness) _
541 = case (pprTempAndExternDecls stmt) of { (_, pp_exts) ->
545 ptext SLIT("VEC_INFO_") <> int size,
547 pprCLabel lbl, comma,
548 pp_liveness liveness, comma, -- bitmap liveness mask
549 pp_srt_info srt, -- SRT
550 ptext type_str, comma,
551 ppLocalness lbl, comma
553 nest 2 (sep (punctuate comma (map ppr_item amodes))),
559 ppr_item item = (<>) (text "(F_) ") (ppr_amode item)
562 type_str = case liveness of
563 LvSmall _ -> SLIT("RET_VEC_SMALL")
564 LvLarge _ -> SLIT("RET_VEC_BIG")
567 pprAbsC stmt@(CModuleInitBlock lbl code) _
569 ptext SLIT("START_MOD_INIT") <> parens (pprCLabel lbl),
570 case (pprTempAndExternDecls stmt) of { (_, pp_exts) -> pp_exts },
571 pprAbsC code (costs code),
572 hcat [ptext SLIT("END_MOD_INIT"), lparen, rparen]
575 pprAbsC (CCostCentreDecl is_local cc) _ = pprCostCentreDecl is_local cc
576 pprAbsC (CCostCentreStackDecl ccs) _ = pprCostCentreStackDecl ccs
581 = if (externallyVisibleCLabel lbl)
583 else ptext SLIT("static ")
585 -- Horrible macros for declaring the types and locality of labels (see
588 ppLocalnessMacro include_dyn_prefix clabel =
593 ClosureType -> ptext SLIT("C_")
594 CodeType -> ptext SLIT("F_")
595 InfoTblType -> ptext SLIT("I_")
596 ClosureTblType -> ptext SLIT("CP_")
597 DataType -> ptext SLIT("D_")
600 is_visible = externallyVisibleCLabel clabel
601 label_type = labelType clabel
604 | is_visible = char 'E'
605 | otherwise = char 'I'
608 | include_dyn_prefix && labelDynamic clabel = char 'D'
616 grab_non_void_amodes amodes
617 = filter non_void amodes
620 = case (getAmodeRep amode) of
626 ppr_vol_regs :: [MagicId] -> (SDoc, SDoc)
628 ppr_vol_regs [] = (empty, empty)
629 ppr_vol_regs (VoidReg:rs) = ppr_vol_regs rs
631 = let pp_reg = case r of
632 VanillaReg pk n -> pprVanillaReg n
634 (more_saves, more_restores) = ppr_vol_regs rs
636 (($$) ((<>) (ptext SLIT("CALLER_SAVE_")) pp_reg) more_saves,
637 ($$) ((<>) (ptext SLIT("CALLER_RESTORE_")) pp_reg) more_restores)
639 -- pp_basic_{saves,restores}: The BaseReg, Sp, Su, Hp and
640 -- HpLim (see StgRegs.lh) may need to be saved/restored around CCalls,
641 -- depending on the platform. (The "volatile regs" stuff handles all
642 -- other registers.) Just be *sure* BaseReg is OK before trying to do
643 -- anything else. The correct sequence of saves&restores are
644 -- encoded by the CALLER_*_SYSTEM macros.
645 pp_basic_saves = ptext SLIT("CALLER_SAVE_SYSTEM")
646 pp_basic_restores = ptext SLIT("CALLER_RESTORE_SYSTEM")
650 has_srt (_, NoSRT) = False
659 (lbl, SRT off len) ->
660 hcat [ pprCLabel lbl, comma,
667 | labelDynamic lbl = text "DLL_SRT_ENTRY" <> parens (pprCLabel lbl)
668 | otherwise = char '&' <> pprCLabel lbl
673 = if opt_SccProfilingOn
675 else char '0' -- leave it out!
676 -- ---------------------------------------------------------------------------
677 -- Changes for GrAnSim:
678 -- draw costs for computation in head of if into both branches;
679 -- as no abstractC data structure is given for the head, one is constructed
680 -- guessing unknown values and fed into the costs function
681 -- ---------------------------------------------------------------------------
683 do_if_stmt discrim tag alt_code deflt c
685 -- This special case happens when testing the result of a comparison.
686 -- We can just avoid some redundant clutter in the output.
687 MachInt n | n==0 -> ppr_if_stmt (pprAmode discrim)
689 (addrModeCosts discrim Rhs) c
691 cond = hcat [ pprAmode discrim
694 , pprAmode (CLit tag)
696 -- to be absolutely sure that none of the
697 -- conversion rules hit, e.g.,
699 -- minInt is different to (int)minInt
701 -- in C (when minInt is a number not a constant
702 -- expression which evaluates to it.)
704 tcast = case other of
705 MachInt _ -> ptext SLIT("(I_)")
710 (addrModeCosts discrim Rhs) c
712 ppr_if_stmt pp_pred then_part else_part discrim_costs c
714 hcat [text "if (", pp_pred, text ") {"],
715 nest 8 (pprAbsC then_part (c + discrim_costs +
716 (Cost (0, 2, 0, 0, 0)) +
718 (case nonemptyAbsC else_part of Nothing -> empty; Just _ -> text "} else {"),
719 nest 8 (pprAbsC else_part (c + discrim_costs +
720 (Cost (0, 1, 0, 0, 0)) +
723 {- Total costs = inherited costs (before if) + costs for accessing discrim
724 + costs for cond branch ( = (0, 1, 0, 0, 0) )
725 + costs for that alternative
729 Historical note: this used to be two separate cases -- one for `ccall'
730 and one for `casm'. To get round a potential limitation to only 10
731 arguments, the numbering of arguments in @process_casm@ was beefed up a
734 Some rough notes on generating code for @CCallOp@:
736 1) Evaluate all arguments and stuff them into registers. (done elsewhere)
737 2) Save any essential registers (heap, stack, etc).
739 ToDo: If stable pointers are in use, these must be saved in a place
740 where the runtime system can get at them so that the Stg world can
741 be restarted during the call.
743 3) Save any temporary registers that are currently in use.
744 4) Do the call, putting result into a local variable
745 5) Restore essential registers
746 6) Restore temporaries
748 (This happens after restoration of essential registers because we
749 might need the @Base@ register to access all the others correctly.)
751 Otherwise, copy local variable into result register.
753 8) If ccall (not casm), declare the function being called as extern so
754 that C knows if it returns anything other than an int.
757 { ResultType _ccall_result;
760 _ccall_result = f( args );
764 return_reg = _ccall_result;
768 Amendment to the above: if we can GC, we have to:
770 * make sure we save all our registers away where the garbage collector
772 * be sure that there are no live registers or we're in trouble.
773 (This can cause problems if you try something foolish like passing
774 an array or a foreign obj to a _ccall_GC_ thing.)
775 * increment/decrement the @inCCallGC@ counter before/after the call so
776 that the runtime check that PerformGC is being used sensibly will work.
779 pprCCall call@(CCall op_str is_asm may_gc cconv) args results vol_regs
782 declare_local_vars, -- local var for *result*
783 vcat local_arg_decls,
785 process_casm local_vars pp_non_void_args casm_str,
791 (pp_saves, pp_restores) = ppr_vol_regs vol_regs
792 (pp_save_context, pp_restore_context)
793 | may_gc = ( text "{ I_ id; SUSPEND_THREAD(id);"
794 , text "RESUME_THREAD(id);}"
796 | otherwise = ( pp_basic_saves $$ pp_saves,
797 pp_basic_restores $$ pp_restores)
801 in ASSERT2 ( all non_void nvas, pprCCallOp call <+> hsep (map pprAmode args) )
803 -- the last argument will be the "I/O world" token (a VoidRep)
804 -- all others should be non-void
807 let nvrs = grab_non_void_amodes results
808 in ASSERT (length nvrs <= 1) nvrs
809 -- there will usually be two results: a (void) state which we
810 -- should ignore and a (possibly void) result.
812 (local_arg_decls, pp_non_void_args)
813 = unzip [ ppr_casm_arg a i | (a,i) <- non_void_args `zip` [1..] ]
815 ccall_arg_tys = map (text.showPrimRep.getAmodeRep) non_void_args
818 case non_void_results of
819 [] -> ptext SLIT("void")
820 [amode] -> text (showPrimRep (getAmodeRep amode))
821 _ -> panic "pprCCall: ccall_res_ty"
824 ptext SLIT("_ccall_fun_ty") <>
826 DynamicTarget u -> ppr u
829 (declare_local_vars, local_vars, assign_results)
830 = ppr_casm_results non_void_results
832 (StaticTarget asm_str) = op_str
835 StaticTarget _ -> False
836 DynamicTarget _ -> True
838 casm_str = if is_asm then _UNPK_ asm_str else ccall_str
840 -- Remainder only used for ccall
843 | is_dynamic = parens (parens (ccall_fun_ty) <> text "%0")
844 | otherwise = ptext asm_str
848 if null non_void_results
851 lparen, fun_name, lparen,
852 hcat (punctuate comma ccall_fun_args),
857 | is_dynamic = tail ccall_args
858 | otherwise = ccall_args
860 ccall_args = zipWith (\ _ i -> char '%' <> int i) non_void_args [0..]
864 If the argument is a heap object, we need to reach inside and pull out
865 the bit the C world wants to see. The only heap objects which can be
866 passed are @Array@s and @ByteArray@s.
869 ppr_casm_arg :: CAddrMode -> Int -> (SDoc, SDoc)
870 -- (a) decl and assignment, (b) local var to be used later
872 ppr_casm_arg amode a_num
874 a_kind = getAmodeRep amode
875 pp_amode = pprAmode amode
876 pp_kind = pprPrimKind a_kind
878 local_var = (<>) (ptext SLIT("_ccall_arg")) (int a_num)
880 (arg_type, pp_amode2)
883 -- for array arguments, pass a pointer to the body of the array
884 -- (PTRS_ARR_CTS skips over all the header nonsense)
885 ArrayRep -> (pp_kind,
886 hcat [ptext SLIT("PTRS_ARR_CTS"),char '(', pp_amode, rparen])
887 ByteArrayRep -> (pp_kind,
888 hcat [ptext SLIT("BYTE_ARR_CTS"),char '(', pp_amode, rparen])
890 -- for ForeignObj, use FOREIGN_OBJ_DATA to fish out the contents.
891 ForeignObjRep -> (pp_kind,
892 hcat [ptext SLIT("ForeignObj_CLOSURE_DATA"),
893 char '(', pp_amode, char ')'])
895 other -> (pp_kind, pp_amode)
898 = hcat [ arg_type, space, local_var, equals, pp_amode2, semi ]
900 (declare_local_var, local_var)
903 For l-values, the critical questions are:
905 1) Are there any results at all?
907 We only allow zero or one results.
911 :: [CAddrMode] -- list of results (length <= 1)
913 ( SDoc, -- declaration of any local vars
914 [SDoc], -- list of result vars (same length as results)
915 SDoc ) -- assignment (if any) of results in local var to registers
918 = (empty, [], empty) -- no results
922 result_reg = ppr_amode r
923 r_kind = getAmodeRep r
925 local_var = ptext SLIT("_ccall_result")
927 (result_type, assign_result)
928 = (pprPrimKind r_kind,
929 hcat [ result_reg, equals, local_var, semi ])
931 declare_local_var = hcat [ result_type, space, local_var, semi ]
933 (declare_local_var, [local_var], assign_result)
936 = panic "ppr_casm_results: ccall/casm with many results"
940 Note the sneaky way _the_ result is represented by a list so that we
941 can complain if it's used twice.
943 ToDo: Any chance of giving line numbers when process-casm fails?
944 Or maybe we should do a check _much earlier_ in compiler. ADR
947 process_casm :: [SDoc] -- results (length <= 1)
948 -> [SDoc] -- arguments
949 -> String -- format string (with embedded %'s)
950 -> SDoc -- code being generated
952 process_casm results args string = process results args string
954 process [] _ "" = empty
955 process (_:_) _ "" = error ("process_casm: non-void result not assigned while processing _casm_ \"" ++
957 "\"\n(Try changing result type to IO ()\n")
959 process ress args ('%':cs)
962 error ("process_casm: lonely % while processing _casm_ \"" ++ string ++ "\".\n")
965 char '%' <> process ress args css
969 [] -> error ("process_casm: no result to match %r while processing _casm_ \"" ++ string ++ "\".\nTry deleting %r or changing result type from PrimIO ()\n")
970 [r] -> r <> (process [] args css)
971 _ -> panic ("process_casm: casm with many results while processing _casm_ \"" ++ string ++ "\".\n")
975 read_int :: ReadS Int
978 case (read_int other) of
980 if 0 <= num && num < length args
981 then parens (args !! num) <> process ress args css
982 else error ("process_casm: no such arg #:"++(show num)++" while processing \"" ++ string ++ "\".\n")
983 _ -> error ("process_casm: not %<num> while processing _casm_ \"" ++ string ++ "\".\n")
985 process ress args (other_c:cs)
986 = char other_c <> process ress args cs
989 %************************************************************************
991 \subsection[a2r-assignments]{Assignments}
993 %************************************************************************
995 Printing assignments is a little tricky because of type coercion.
997 First of all, the kind of the thing being assigned can be gotten from
998 the destination addressing mode. (It should be the same as the kind
999 of the source addressing mode.) If the kind of the assignment is of
1000 @VoidRep@, then don't generate any code at all.
1003 pprAssign :: PrimRep -> CAddrMode -> CAddrMode -> SDoc
1005 pprAssign VoidRep dest src = empty
1008 Special treatment for floats and doubles, to avoid unwanted conversions.
1011 pprAssign FloatRep dest@(CVal reg_rel _) src
1012 = hcat [ ptext SLIT("ASSIGN_FLT"),char '(', ppr_amode (CAddr reg_rel), comma, pprAmode src, pp_paren_semi ]
1014 pprAssign DoubleRep dest@(CVal reg_rel _) src
1015 = hcat [ ptext SLIT("ASSIGN_DBL"),char '(', ppr_amode (CAddr reg_rel), comma, pprAmode src, pp_paren_semi ]
1017 pprAssign Int64Rep dest@(CVal reg_rel _) src
1018 = hcat [ ptext SLIT("ASSIGN_Int64"),char '(', ppr_amode (CAddr reg_rel), comma, pprAmode src, pp_paren_semi ]
1019 pprAssign Word64Rep dest@(CVal reg_rel _) src
1020 = hcat [ ptext SLIT("ASSIGN_Word64"),char '(', ppr_amode (CAddr reg_rel), comma, pprAmode src, pp_paren_semi ]
1023 Lastly, the question is: will the C compiler think the types of the
1024 two sides of the assignment match?
1026 We assume that the types will match if neither side is a
1027 @CVal@ addressing mode for any register which can point into
1030 Why? Because the heap and stack are used to store miscellaneous
1031 things, whereas the temporaries, registers, etc., are only used for
1032 things of fixed type.
1035 pprAssign kind (CReg (VanillaReg _ dest)) (CReg (VanillaReg _ src))
1036 = hcat [ pprVanillaReg dest, equals,
1037 pprVanillaReg src, semi ]
1039 pprAssign kind dest src
1040 | mixedTypeLocn dest
1041 -- Add in a cast to StgWord (a.k.a. W_) iff the destination is mixed
1042 = hcat [ ppr_amode dest, equals,
1043 text "(W_)(", -- Here is the cast
1044 ppr_amode src, pp_paren_semi ]
1046 pprAssign kind dest src
1047 | mixedPtrLocn dest && getAmodeRep src /= PtrRep
1048 -- Add in a cast to StgPtr (a.k.a. P_) iff the destination is mixed
1049 = hcat [ ppr_amode dest, equals,
1050 text "(P_)(", -- Here is the cast
1051 ppr_amode src, pp_paren_semi ]
1053 pprAssign ByteArrayRep dest src
1055 -- Add in a cast iff the source is mixed
1056 = hcat [ ppr_amode dest, equals,
1057 text "(StgByteArray)(", -- Here is the cast
1058 ppr_amode src, pp_paren_semi ]
1060 pprAssign kind other_dest src
1061 = hcat [ ppr_amode other_dest, equals,
1062 pprAmode src, semi ]
1066 %************************************************************************
1068 \subsection[a2r-CAddrModes]{Addressing modes}
1070 %************************************************************************
1072 @pprAmode@ is used to print r-values (which may need casts), whereas
1073 @ppr_amode@ is used for l-values {\em and} as a help function for
1077 pprAmode, ppr_amode :: CAddrMode -> SDoc
1080 For reasons discussed above under assignments, @CVal@ modes need
1081 to be treated carefully. First come special cases for floats and doubles,
1082 similar to those in @pprAssign@:
1084 (NB: @PK_FLT@ and @PK_DBL@ require the {\em address} of the value in
1088 pprAmode (CVal reg_rel FloatRep)
1089 = hcat [ text "PK_FLT(", ppr_amode (CAddr reg_rel), rparen ]
1090 pprAmode (CVal reg_rel DoubleRep)
1091 = hcat [ text "PK_DBL(", ppr_amode (CAddr reg_rel), rparen ]
1092 pprAmode (CVal reg_rel Int64Rep)
1093 = hcat [ text "PK_Int64(", ppr_amode (CAddr reg_rel), rparen ]
1094 pprAmode (CVal reg_rel Word64Rep)
1095 = hcat [ text "PK_Word64(", ppr_amode (CAddr reg_rel), rparen ]
1098 Next comes the case where there is some other cast need, and the
1103 | mixedTypeLocn amode
1104 = parens (hcat [ pprPrimKind (getAmodeRep amode), ptext SLIT(")("),
1106 | otherwise -- No cast needed
1110 Now the rest of the cases for ``workhorse'' @ppr_amode@:
1113 ppr_amode (CVal reg_rel _)
1114 = case (pprRegRelative False{-no sign wanted-} reg_rel) of
1115 (pp_reg, Nothing) -> (<>) (char '*') pp_reg
1116 (pp_reg, Just offset) -> hcat [ pp_reg, brackets offset ]
1118 ppr_amode (CAddr reg_rel)
1119 = case (pprRegRelative True{-sign wanted-} reg_rel) of
1120 (pp_reg, Nothing) -> pp_reg
1121 (pp_reg, Just offset) -> (<>) pp_reg offset
1123 ppr_amode (CReg magic_id) = pprMagicId magic_id
1125 ppr_amode (CTemp uniq kind) = char '_' <> pprUnique uniq <> char '_'
1127 ppr_amode (CLbl lbl kind) = pprCLabelAddr lbl
1129 ppr_amode (CCharLike ch)
1130 = hcat [ptext SLIT("CHARLIKE_CLOSURE"), char '(', pprAmode ch, rparen ]
1131 ppr_amode (CIntLike int)
1132 = hcat [ptext SLIT("INTLIKE_CLOSURE"), char '(', pprAmode int, rparen ]
1134 ppr_amode (CLit lit) = pprBasicLit lit
1136 ppr_amode (CLitLit str _) = ptext str
1138 ppr_amode (CJoinPoint _)
1139 = panic "ppr_amode: CJoinPoint"
1141 ppr_amode (CMacroExpr pk macro as)
1142 = parens (pprPrimKind pk) <>
1143 parens (ptext (cExprMacroText macro) <>
1144 parens (hcat (punctuate comma (map pprAmode as))))
1148 cExprMacroText ENTRY_CODE = SLIT("ENTRY_CODE")
1149 cExprMacroText ARG_TAG = SLIT("ARG_TAG")
1150 cExprMacroText GET_TAG = SLIT("GET_TAG")
1151 cExprMacroText UPD_FRAME_UPDATEE = SLIT("UPD_FRAME_UPDATEE")
1153 cStmtMacroText ARGS_CHK = SLIT("ARGS_CHK")
1154 cStmtMacroText ARGS_CHK_LOAD_NODE = SLIT("ARGS_CHK_LOAD_NODE")
1155 cStmtMacroText UPD_CAF = SLIT("UPD_CAF")
1156 cStmtMacroText UPD_BH_UPDATABLE = SLIT("UPD_BH_UPDATABLE")
1157 cStmtMacroText UPD_BH_SINGLE_ENTRY = SLIT("UPD_BH_SINGLE_ENTRY")
1158 cStmtMacroText PUSH_UPD_FRAME = SLIT("PUSH_UPD_FRAME")
1159 cStmtMacroText PUSH_SEQ_FRAME = SLIT("PUSH_SEQ_FRAME")
1160 cStmtMacroText UPDATE_SU_FROM_UPD_FRAME = SLIT("UPDATE_SU_FROM_UPD_FRAME")
1161 cStmtMacroText SET_TAG = SLIT("SET_TAG")
1162 cStmtMacroText REGISTER_FOREIGN_EXPORT = SLIT("REGISTER_FOREIGN_EXPORT")
1163 cStmtMacroText REGISTER_IMPORT = SLIT("REGISTER_IMPORT")
1164 cStmtMacroText GRAN_FETCH = SLIT("GRAN_FETCH")
1165 cStmtMacroText GRAN_RESCHEDULE = SLIT("GRAN_RESCHEDULE")
1166 cStmtMacroText GRAN_FETCH_AND_RESCHEDULE= SLIT("GRAN_FETCH_AND_RESCHEDULE")
1167 cStmtMacroText THREAD_CONTEXT_SWITCH = SLIT("THREAD_CONTEXT_SWITCH")
1168 cStmtMacroText GRAN_YIELD = SLIT("GRAN_YIELD")
1170 cCheckMacroText HP_CHK_NP = SLIT("HP_CHK_NP")
1171 cCheckMacroText STK_CHK_NP = SLIT("STK_CHK_NP")
1172 cCheckMacroText HP_STK_CHK_NP = SLIT("HP_STK_CHK_NP")
1173 cCheckMacroText HP_CHK_SEQ_NP = SLIT("HP_CHK_SEQ_NP")
1174 cCheckMacroText HP_CHK = SLIT("HP_CHK")
1175 cCheckMacroText STK_CHK = SLIT("STK_CHK")
1176 cCheckMacroText HP_STK_CHK = SLIT("HP_STK_CHK")
1177 cCheckMacroText HP_CHK_NOREGS = SLIT("HP_CHK_NOREGS")
1178 cCheckMacroText HP_CHK_UNPT_R1 = SLIT("HP_CHK_UNPT_R1")
1179 cCheckMacroText HP_CHK_UNBX_R1 = SLIT("HP_CHK_UNBX_R1")
1180 cCheckMacroText HP_CHK_F1 = SLIT("HP_CHK_F1")
1181 cCheckMacroText HP_CHK_D1 = SLIT("HP_CHK_D1")
1182 cCheckMacroText HP_CHK_L1 = SLIT("HP_CHK_L1")
1183 cCheckMacroText HP_CHK_UT_ALT = SLIT("HP_CHK_UT_ALT")
1184 cCheckMacroText HP_CHK_GEN = SLIT("HP_CHK_GEN")
1187 %************************************************************************
1189 \subsection[ppr-liveness-masks]{Liveness Masks}
1191 %************************************************************************
1194 pp_liveness :: Liveness -> SDoc
1197 LvLarge lbl -> char '&' <> pprCLabel lbl
1198 LvSmall mask -- Avoid gcc bug when printing minInt
1199 | bitmap_int == minInt -> int (bitmap_int+1) <> text "-1"
1200 | otherwise -> int bitmap_int
1202 bitmap_int = intBS mask
1205 %************************************************************************
1207 \subsection[a2r-MagicIds]{Magic ids}
1209 %************************************************************************
1211 @pprRegRelative@ returns a pair of the @Doc@ for the register
1212 (some casting may be required), and a @Maybe Doc@ for the offset
1213 (zero offset gives a @Nothing@).
1216 addPlusSign :: Bool -> SDoc -> SDoc
1217 addPlusSign False p = p
1218 addPlusSign True p = (<>) (char '+') p
1220 pprSignedInt :: Bool -> Int -> Maybe SDoc -- Nothing => 0
1221 pprSignedInt sign_wanted n
1222 = if n == 0 then Nothing else
1223 if n > 0 then Just (addPlusSign sign_wanted (int n))
1226 pprRegRelative :: Bool -- True <=> Print leading plus sign (if +ve)
1228 -> (SDoc, Maybe SDoc)
1230 pprRegRelative sign_wanted (SpRel off)
1231 = (pprMagicId Sp, pprSignedInt sign_wanted (I# off))
1233 pprRegRelative sign_wanted r@(HpRel o)
1234 = let pp_Hp = pprMagicId Hp; off = I# o
1239 (pp_Hp, Just ((<>) (char '-') (int off)))
1241 pprRegRelative sign_wanted (NodeRel o)
1242 = let pp_Node = pprMagicId node; off = I# o
1247 (pp_Node, Just (addPlusSign sign_wanted (int off)))
1249 pprRegRelative sign_wanted (CIndex base offset kind)
1250 = ( hcat [text "((", pprPrimKind kind, text " *)(", ppr_amode base, text "))"]
1251 , Just (hcat [if sign_wanted then char '+' else empty,
1252 text "(I_)(", ppr_amode offset, ptext SLIT(")")])
1256 @pprMagicId@ just prints the register name. @VanillaReg@ registers are
1257 represented by a discriminated union (@StgUnion@), so we use the @PrimRep@
1258 to select the union tag.
1261 pprMagicId :: MagicId -> SDoc
1263 pprMagicId BaseReg = ptext SLIT("BaseReg")
1264 pprMagicId (VanillaReg pk n)
1265 = hcat [ pprVanillaReg n, char '.',
1267 pprMagicId (FloatReg n) = (<>) (ptext SLIT("F")) (int IBOX(n))
1268 pprMagicId (DoubleReg n) = (<>) (ptext SLIT("D")) (int IBOX(n))
1269 pprMagicId (LongReg _ n) = (<>) (ptext SLIT("L")) (int IBOX(n))
1270 pprMagicId Sp = ptext SLIT("Sp")
1271 pprMagicId Su = ptext SLIT("Su")
1272 pprMagicId SpLim = ptext SLIT("SpLim")
1273 pprMagicId Hp = ptext SLIT("Hp")
1274 pprMagicId HpLim = ptext SLIT("HpLim")
1275 pprMagicId CurCostCentre = ptext SLIT("CCCS")
1276 pprMagicId VoidReg = panic "pprMagicId:VoidReg!"
1278 pprVanillaReg :: FAST_INT -> SDoc
1279 pprVanillaReg n = (<>) (char 'R') (int IBOX(n))
1281 pprUnionTag :: PrimRep -> SDoc
1283 pprUnionTag PtrRep = char 'p'
1284 pprUnionTag CodePtrRep = ptext SLIT("fp")
1285 pprUnionTag DataPtrRep = char 'd'
1286 pprUnionTag RetRep = char 'p'
1287 pprUnionTag CostCentreRep = panic "pprUnionTag:CostCentre?"
1289 pprUnionTag CharRep = char 'c'
1290 pprUnionTag IntRep = char 'i'
1291 pprUnionTag WordRep = char 'w'
1292 pprUnionTag AddrRep = char 'a'
1293 pprUnionTag FloatRep = char 'f'
1294 pprUnionTag DoubleRep = panic "pprUnionTag:Double?"
1296 pprUnionTag StablePtrRep = char 'i'
1297 pprUnionTag StableNameRep = char 'p'
1298 pprUnionTag WeakPtrRep = char 'p'
1299 pprUnionTag ForeignObjRep = char 'p'
1301 pprUnionTag ThreadIdRep = char 't'
1303 pprUnionTag ArrayRep = char 'p'
1304 pprUnionTag ByteArrayRep = char 'b'
1306 pprUnionTag _ = panic "pprUnionTag:Odd kind"
1310 Find and print local and external declarations for a list of
1311 Abstract~C statements.
1313 pprTempAndExternDecls :: AbstractC -> (SDoc{-temps-}, SDoc{-externs-})
1314 pprTempAndExternDecls AbsCNop = (empty, empty)
1316 pprTempAndExternDecls (AbsCStmts stmt1 stmt2)
1317 = initTE (ppr_decls_AbsC stmt1 `thenTE` \ (t_p1, e_p1) ->
1318 ppr_decls_AbsC stmt2 `thenTE` \ (t_p2, e_p2) ->
1319 case (catMaybes [t_p1, t_p2]) of { real_temps ->
1320 case (catMaybes [e_p1, e_p2]) of { real_exts ->
1321 returnTE (vcat real_temps, vcat real_exts) }}
1324 pprTempAndExternDecls other_stmt
1325 = initTE (ppr_decls_AbsC other_stmt `thenTE` \ (maybe_t, maybe_e) ->
1336 pprBasicLit :: Literal -> SDoc
1337 pprPrimKind :: PrimRep -> SDoc
1339 pprBasicLit lit = ppr lit
1340 pprPrimKind k = ppr k
1344 %************************************************************************
1346 \subsection[a2r-monad]{Monadery}
1348 %************************************************************************
1350 We need some monadery to keep track of temps and externs we have already
1351 printed. This info must be threaded right through the Abstract~C, so
1352 it's most convenient to hide it in this monad.
1354 WDP 95/02: Switched from \tr{([Unique], [CLabel])} to
1355 \tr{(UniqSet, CLabelSet)}. Allegedly for efficiency.
1358 type CLabelSet = FiniteMap CLabel (){-any type will do-}
1359 emptyCLabelSet = emptyFM
1360 x `elementOfCLabelSet` labs
1361 = case (lookupFM labs x) of { Just _ -> True; Nothing -> False }
1363 addToCLabelSet set x = addToFM set x ()
1365 type TEenv = (UniqSet Unique, CLabelSet)
1367 type TeM result = TEenv -> (TEenv, result)
1369 initTE :: TeM a -> a
1371 = case sa (emptyUniqSet, emptyCLabelSet) of { (_, result) ->
1374 {-# INLINE thenTE #-}
1375 {-# INLINE returnTE #-}
1377 thenTE :: TeM a -> (a -> TeM b) -> TeM b
1379 = case a u of { (u_1, result_of_a) ->
1382 mapTE :: (a -> TeM b) -> [a] -> TeM [b]
1383 mapTE f [] = returnTE []
1385 = f x `thenTE` \ r ->
1386 mapTE f xs `thenTE` \ rs ->
1389 returnTE :: a -> TeM a
1390 returnTE result env = (env, result)
1392 -- these next two check whether the thing is already
1393 -- recorded, and THEN THEY RECORD IT
1394 -- (subsequent calls will return False for the same uniq/label)
1396 tempSeenTE :: Unique -> TeM Bool
1397 tempSeenTE uniq env@(seen_uniqs, seen_labels)
1398 = if (uniq `elementOfUniqSet` seen_uniqs)
1400 else ((addOneToUniqSet seen_uniqs uniq,
1404 labelSeenTE :: CLabel -> TeM Bool
1405 labelSeenTE lbl env@(seen_uniqs, seen_labels)
1406 = if (lbl `elementOfCLabelSet` seen_labels)
1409 addToCLabelSet seen_labels lbl),
1414 pprTempDecl :: Unique -> PrimRep -> SDoc
1415 pprTempDecl uniq kind
1416 = hcat [ pprPrimKind kind, space, char '_', pprUnique uniq, ptext SLIT("_;") ]
1418 pprExternDecl :: Bool -> CLabel -> SDoc
1419 pprExternDecl in_srt clabel
1420 | not (needsCDecl clabel) = empty -- do not print anything for "known external" things
1422 hcat [ ppLocalnessMacro (not in_srt) clabel,
1423 lparen, dyn_wrapper (pprCLabel clabel), pp_paren_semi ]
1426 | in_srt && labelDynamic clabel = text "DLL_IMPORT_DATA_VAR" <> parens d
1432 ppr_decls_AbsC :: AbstractC -> TeM (Maybe SDoc{-temps-}, Maybe SDoc{-externs-})
1434 ppr_decls_AbsC AbsCNop = returnTE (Nothing, Nothing)
1436 ppr_decls_AbsC (AbsCStmts stmts_1 stmts_2)
1437 = ppr_decls_AbsC stmts_1 `thenTE` \ p1 ->
1438 ppr_decls_AbsC stmts_2 `thenTE` \ p2 ->
1439 returnTE (maybe_vcat [p1, p2])
1441 ppr_decls_AbsC (CSplitMarker) = returnTE (Nothing, Nothing)
1443 ppr_decls_AbsC (CAssign dest source)
1444 = ppr_decls_Amode dest `thenTE` \ p1 ->
1445 ppr_decls_Amode source `thenTE` \ p2 ->
1446 returnTE (maybe_vcat [p1, p2])
1448 ppr_decls_AbsC (CJump target) = ppr_decls_Amode target
1450 ppr_decls_AbsC (CFallThrough target) = ppr_decls_Amode target
1452 ppr_decls_AbsC (CReturn target _) = ppr_decls_Amode target
1454 ppr_decls_AbsC (CSwitch discrim alts deflt)
1455 = ppr_decls_Amode discrim `thenTE` \ pdisc ->
1456 mapTE ppr_alt_stuff alts `thenTE` \ palts ->
1457 ppr_decls_AbsC deflt `thenTE` \ pdeflt ->
1458 returnTE (maybe_vcat (pdisc:pdeflt:palts))
1460 ppr_alt_stuff (_, absC) = ppr_decls_AbsC absC
1462 ppr_decls_AbsC (CCodeBlock lbl absC)
1463 = ppr_decls_AbsC absC
1465 ppr_decls_AbsC (CInitHdr cl_info reg_rel cost_centre)
1466 -- ToDo: strictly speaking, should chk "cost_centre" amode
1467 = labelSeenTE info_lbl `thenTE` \ label_seen ->
1472 Just (pprExternDecl False{-not in an SRT decl-} info_lbl))
1474 info_lbl = infoTableLabelFromCI cl_info
1476 ppr_decls_AbsC (COpStmt results _ args _) = ppr_decls_Amodes (results ++ args)
1477 ppr_decls_AbsC (CSimultaneous abc) = ppr_decls_AbsC abc
1479 ppr_decls_AbsC (CCheck _ amodes code) =
1480 ppr_decls_Amodes amodes `thenTE` \p1 ->
1481 ppr_decls_AbsC code `thenTE` \p2 ->
1482 returnTE (maybe_vcat [p1,p2])
1484 ppr_decls_AbsC (CMacroStmt _ amodes) = ppr_decls_Amodes amodes
1486 ppr_decls_AbsC (CCallProfCtrMacro _ amodes) = ppr_decls_Amodes [] -- *****!!!
1487 -- you get some nasty re-decls of stdio.h if you compile
1488 -- the prelude while looking inside those amodes;
1489 -- no real reason to, anyway.
1490 ppr_decls_AbsC (CCallProfCCMacro _ amodes) = ppr_decls_Amodes amodes
1492 ppr_decls_AbsC (CStaticClosure closure_lbl closure_info cost_centre amodes)
1493 -- ToDo: strictly speaking, should chk "cost_centre" amode
1494 = ppr_decls_Amodes amodes
1496 ppr_decls_AbsC (CClosureInfoAndCode cl_info slow maybe_fast _)
1497 = ppr_decls_Amodes [entry_lbl] `thenTE` \ p1 ->
1498 ppr_decls_AbsC slow `thenTE` \ p2 ->
1500 Nothing -> returnTE (Nothing, Nothing)
1501 Just fast -> ppr_decls_AbsC fast) `thenTE` \ p3 ->
1502 returnTE (maybe_vcat [p1, p2, p3])
1504 entry_lbl = CLbl slow_lbl CodePtrRep
1505 slow_lbl = case (nonemptyAbsC slow) of
1506 Nothing -> mkErrorStdEntryLabel
1507 Just _ -> entryLabelFromCI cl_info
1509 ppr_decls_AbsC (CSRT lbl closure_lbls)
1510 = mapTE labelSeenTE closure_lbls `thenTE` \ seen ->
1512 if and seen then Nothing
1513 else Just (vcat [ pprExternDecl True{-in SRT decl-} l
1514 | (l,False) <- zip closure_lbls seen ]))
1516 ppr_decls_AbsC (CRetDirect _ code _ _) = ppr_decls_AbsC code
1517 ppr_decls_AbsC (CRetVector _ amodes _ _) = ppr_decls_Amodes amodes
1518 ppr_decls_AbsC (CModuleInitBlock _ code) = ppr_decls_AbsC code
1520 ppr_decls_AbsC (_) = returnTE (Nothing, Nothing)
1524 ppr_decls_Amode :: CAddrMode -> TeM (Maybe SDoc, Maybe SDoc)
1525 ppr_decls_Amode (CVal (CIndex base offset _) _) = ppr_decls_Amodes [base,offset]
1526 ppr_decls_Amode (CAddr (CIndex base offset _)) = ppr_decls_Amodes [base,offset]
1527 ppr_decls_Amode (CVal _ _) = returnTE (Nothing, Nothing)
1528 ppr_decls_Amode (CAddr _) = returnTE (Nothing, Nothing)
1529 ppr_decls_Amode (CReg _) = returnTE (Nothing, Nothing)
1530 ppr_decls_Amode (CLit _) = returnTE (Nothing, Nothing)
1531 ppr_decls_Amode (CLitLit _ _) = returnTE (Nothing, Nothing)
1533 -- CIntLike must be a literal -- no decls
1534 ppr_decls_Amode (CIntLike int) = returnTE (Nothing, Nothing)
1536 -- CCharLike may have be arbitrary value -- may have decls
1537 ppr_decls_Amode (CCharLike char)
1538 = ppr_decls_Amode char
1540 -- now, the only place where we actually print temps/externs...
1541 ppr_decls_Amode (CTemp uniq kind)
1543 VoidRep -> returnTE (Nothing, Nothing)
1545 tempSeenTE uniq `thenTE` \ temp_seen ->
1547 (if temp_seen then Nothing else Just (pprTempDecl uniq kind), Nothing)
1549 ppr_decls_Amode (CLbl lbl VoidRep)
1550 = returnTE (Nothing, Nothing)
1552 ppr_decls_Amode (CLbl lbl kind)
1553 = labelSeenTE lbl `thenTE` \ label_seen ->
1555 if label_seen then Nothing else Just (pprExternDecl False{-not in an SRT decl-} lbl))
1557 ppr_decls_Amode (CMacroExpr _ _ amodes)
1558 = ppr_decls_Amodes amodes
1560 ppr_decls_Amode other = returnTE (Nothing, Nothing)
1563 maybe_vcat :: [(Maybe SDoc, Maybe SDoc)] -> (Maybe SDoc, Maybe SDoc)
1565 = case (unzip ps) of { (ts, es) ->
1566 case (catMaybes ts) of { real_ts ->
1567 case (catMaybes es) of { real_es ->
1568 (if (null real_ts) then Nothing else Just (vcat real_ts),
1569 if (null real_es) then Nothing else Just (vcat real_es))
1574 ppr_decls_Amodes :: [CAddrMode] -> TeM (Maybe SDoc, Maybe SDoc)
1575 ppr_decls_Amodes amodes
1576 = mapTE ppr_decls_Amode amodes `thenTE` \ ps ->
1577 returnTE ( maybe_vcat ps )
1580 Print out a C Label where you want the *address* of the label, not the
1581 object it refers to. The distinction is important when the label may
1582 refer to a C structure (info tables and closures, for instance).
1584 When just generating a declaration for the label, use pprCLabel.
1587 pprCLabelAddr :: CLabel -> SDoc
1588 pprCLabelAddr clabel =
1589 case labelType clabel of
1590 InfoTblType -> addr_of_label
1591 ClosureType -> addr_of_label
1592 VecTblType -> addr_of_label
1595 addr_of_label = ptext SLIT("(P_)&") <> pp_label
1596 pp_label = pprCLabel clabel
1600 -----------------------------------------------------------------------------
1601 Initialising static objects with floating-point numbers. We can't
1602 just emit the floating point number, because C will cast it to an int
1603 by rounding it. We want the actual bit-representation of the float.
1605 This is a hack to turn the floating point numbers into ints that we
1606 can safely initialise to static locations.
1609 big_doubles = (getPrimRepSize DoubleRep) /= 1
1611 -- floatss are always 1 word
1612 floatToWord :: CAddrMode -> CAddrMode
1613 floatToWord (CLit (MachFloat r))
1615 arr <- newFloatArray ((0::Int),0)
1616 writeFloatArray arr 0 (fromRational r)
1617 i <- readIntArray arr 0
1618 return (CLit (MachInt (toInteger i)))
1621 doubleToWords :: CAddrMode -> [CAddrMode]
1622 doubleToWords (CLit (MachDouble r))
1623 | big_doubles -- doubles are 2 words
1625 arr <- newDoubleArray ((0::Int),1)
1626 writeDoubleArray arr 0 (fromRational r)
1627 i1 <- readIntArray arr 0
1628 i2 <- readIntArray arr 1
1629 return [ CLit (MachInt (toInteger i1))
1630 , CLit (MachInt (toInteger i2))
1633 | otherwise -- doubles are 1 word
1635 arr <- newDoubleArray ((0::Int),0)
1636 writeDoubleArray arr 0 (fromRational r)
1637 i <- readIntArray arr 0
1638 return [ CLit (MachInt (toInteger i)) ]