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, cCallConv )
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 )
42 import FiniteMap ( addToFM, emptyFM, lookupFM, FiniteMap )
43 import Const ( Literal(..) )
44 import TyCon ( tyConDataCons )
45 import Name ( NamedThing(..) )
46 import DataCon ( DataCon{-instance NamedThing-} )
47 import Maybes ( maybeToBool, catMaybes )
48 import PrimOp ( primOpNeedsWrapper, pprPrimOp, PrimOp(..) )
49 import PrimRep ( isFloatingRep, PrimRep(..), getPrimRepSize, showPrimRep )
50 import SMRep ( pprSMRep )
51 import Unique ( pprUnique, Unique{-instance NamedThing-} )
52 import UniqSet ( emptyUniqSet, elementOfUniqSet,
53 addOneToUniqSet, UniqSet
55 import StgSyn ( SRT(..) )
56 import BitSet ( intBS )
58 import Util ( nOfThem )
67 For spitting out the costs of an abstract~C expression, @writeRealC@
68 now not only prints the C~code of the @absC@ arg but also adds a macro
69 call to a cost evaluation function @GRAN_EXEC@. For that,
70 @pprAbsC@ has a new ``costs'' argument. %% HWL
74 writeRealC :: Handle -> AbstractC -> IO ()
75 writeRealC handle absC
76 -- avoid holding on to the whole of absC in the !Gransim case.
78 then printForCFast fp (pprAbsC absC (costs absC))
79 else printForCFast fp (pprAbsC absC (panic "costs"))
80 --printForC handle (pprAbsC absC (panic "costs"))
81 dumpRealC :: AbstractC -> SDoc
82 dumpRealC absC = pprAbsC absC (costs absC)
85 writeRealC :: Handle -> AbstractC -> IO ()
86 --writeRealC handle absC =
88 -- printDoc LeftMode handle (pprAbsC absC (costs absC))
90 writeRealC handle absC
91 | opt_GranMacros = _scc_ "writeRealC" printForC handle $
92 pprCode CStyle (pprAbsC absC (costs absC))
93 | otherwise = _scc_ "writeRealC" printForC handle $
94 pprCode CStyle (pprAbsC absC (panic "costs"))
96 dumpRealC :: AbstractC -> SDoc
98 | opt_GranMacros = pprCode CStyle (pprAbsC absC (costs absC))
99 | otherwise = pprCode CStyle (pprAbsC absC (panic "costs"))
103 This emits the macro, which is used in GrAnSim to compute the total costs
104 from a cost 5 tuple. %% HWL
107 emitMacro :: CostRes -> SDoc
109 emitMacro _ | not opt_GranMacros = empty
111 emitMacro (Cost (i,b,l,s,f))
112 = hcat [ ptext SLIT("GRAN_EXEC"), char '(',
113 int i, comma, int b, comma, int l, comma,
114 int s, comma, int f, pp_paren_semi ]
116 pp_paren_semi = text ");"
119 New type: Now pprAbsC also takes the costs for evaluating the Abstract C
120 code as an argument (that's needed when spitting out the GRAN_EXEC macro
121 which must be done before the return i.e. inside absC code) HWL
124 pprAbsC :: AbstractC -> CostRes -> SDoc
125 pprAbsC AbsCNop _ = empty
126 pprAbsC (AbsCStmts s1 s2) c = ($$) (pprAbsC s1 c) (pprAbsC s2 c)
128 pprAbsC (CAssign dest src) _ = pprAssign (getAmodeRep dest) dest src
130 pprAbsC (CJump target) c
131 = ($$) (hcat [emitMacro c {-WDP:, text "/* <--++ CJump */"-} ])
132 (hcat [ text jmp_lit, pprAmode target, pp_paren_semi ])
134 pprAbsC (CFallThrough target) c
135 = ($$) (hcat [emitMacro c {-WDP:, text "/* <--++ CFallThrough */"-} ])
136 (hcat [ text jmp_lit, pprAmode target, pp_paren_semi ])
138 -- --------------------------------------------------------------------------
139 -- Spit out GRAN_EXEC macro immediately before the return HWL
141 pprAbsC (CReturn am return_info) c
142 = ($$) (hcat [emitMacro c {-WDP:, text "/* <---- CReturn */"-} ])
143 (hcat [text jmp_lit, target, pp_paren_semi ])
145 target = case return_info of
146 DirectReturn -> hcat [ptext SLIT("ENTRY_CODE"), lparen,
148 DynamicVectoredReturn am' -> mk_vector (pprAmode am')
149 StaticVectoredReturn n -> mk_vector (int n) -- Always positive
150 mk_vector x = hcat [text "RET_VEC", char '(', pprAmode am, comma,
153 pprAbsC (CSplitMarker) _ = ptext SLIT("/* SPLIT */")
155 -- we optimise various degenerate cases of CSwitches.
157 -- --------------------------------------------------------------------------
158 -- Assume: CSwitch is also end of basic block
159 -- costs function yields nullCosts for whole switch
160 -- ==> inherited costs c are those of basic block up to switch
161 -- ==> inherit c + costs for the corresponding branch
163 -- --------------------------------------------------------------------------
165 pprAbsC (CSwitch discrim [] deflt) c
166 = pprAbsC deflt (c + costs deflt)
167 -- Empty alternative list => no costs for discrim as nothing cond. here HWL
169 pprAbsC (CSwitch discrim [(tag,alt_code)] deflt) c -- only one alt
170 = case (nonemptyAbsC deflt) of
171 Nothing -> -- one alt and no default
172 pprAbsC alt_code (c + costs alt_code)
173 -- Nothing conditional in here either HWL
175 Just dc -> -- make it an "if"
176 do_if_stmt discrim tag alt_code dc c
178 -- What problem is the re-ordering trying to solve ?
179 pprAbsC (CSwitch discrim [(tag1@(MachInt i1 _), alt_code1),
180 (tag2@(MachInt i2 _), alt_code2)] deflt) c
181 | empty_deflt && ((i1 == 0 && i2 == 1) || (i1 == 1 && i2 == 0))
183 do_if_stmt discrim tag1 alt_code1 alt_code2 c
185 do_if_stmt discrim tag2 alt_code2 alt_code1 c
187 empty_deflt = not (maybeToBool (nonemptyAbsC deflt))
189 pprAbsC (CSwitch discrim alts deflt) c -- general case
190 | isFloatingRep (getAmodeRep discrim)
191 = pprAbsC (foldr ( \ a -> CSwitch discrim [a]) deflt alts) c
194 hcat [text "switch (", pp_discrim, text ") {"],
195 nest 2 (vcat (map ppr_alt alts)),
196 (case (nonemptyAbsC deflt) of
199 nest 2 (vcat [ptext SLIT("default:"),
200 pprAbsC dc (c + switch_head_cost
202 ptext SLIT("break;")])),
209 = vcat [ hcat [ptext SLIT("case "), pprBasicLit lit, char ':'],
210 nest 2 (($$) (pprAbsC absC (c + switch_head_cost + costs absC))
211 (ptext SLIT("break;"))) ]
213 -- Costs for addressing header of switch and cond. branching -- HWL
214 switch_head_cost = addrModeCosts discrim Rhs + (Cost (0, 1, 0, 0, 0))
216 pprAbsC stmt@(COpStmt results op@(CCallOp _ _ _ _) args vol_regs) _
217 = pprCCall op args results vol_regs
219 pprAbsC stmt@(COpStmt results op args vol_regs) _
221 non_void_args = grab_non_void_amodes args
222 non_void_results = grab_non_void_amodes results
223 -- if just one result, we print in the obvious "assignment" style;
224 -- if 0 or many results, we emit a macro call, w/ the results
225 -- followed by the arguments. The macro presumably knows which
228 the_op = ppr_op_call non_void_results non_void_args
229 -- liveness mask is *in* the non_void_args
231 if primOpNeedsWrapper op then
232 case (ppr_vol_regs vol_regs) of { (pp_saves, pp_restores) ->
241 ppr_op_call results args
242 = hcat [ pprPrimOp op, lparen,
243 hcat (punctuate comma (map ppr_op_result results)),
244 if null results || null args then empty else comma,
245 hcat (punctuate comma (map pprAmode args)),
248 ppr_op_result r = ppr_amode r
249 -- primop macros do their own casting of result;
250 -- hence we can toss the provided cast...
252 pprAbsC stmt@(CSRT lbl closures) c
253 = case (pprTempAndExternDecls stmt) of { (_, pp_exts) ->
255 $$ ptext SLIT("SRT") <> lparen <> pprCLabel lbl <> rparen
256 $$ nest 2 (hcat (punctuate comma (map pp_closure_lbl closures)))
260 pprAbsC stmt@(CBitmap lbl mask) c
262 hcat [ ptext SLIT("BITMAP"), lparen,
263 pprCLabel lbl, comma,
266 hcat (punctuate comma (map (int.intBS) mask)),
270 pprAbsC (CSimultaneous abs_c) c
271 = hcat [ptext SLIT("{{"), pprAbsC abs_c c, ptext SLIT("}}")]
273 pprAbsC (CCheck macro as code) c
274 = hcat [text (show macro), lparen,
275 hcat (punctuate comma (map ppr_amode as)), comma,
276 pprAbsC code c, pp_paren_semi
278 pprAbsC (CMacroStmt macro as) _
279 = hcat [text (show macro), lparen,
280 hcat (punctuate comma (map ppr_amode as)),pp_paren_semi] -- no casting
281 pprAbsC (CCallProfCtrMacro op as) _
282 = hcat [ptext op, lparen,
283 hcat (punctuate comma (map ppr_amode as)),pp_paren_semi]
284 pprAbsC (CCallProfCCMacro op as) _
285 = hcat [ptext op, lparen,
286 hcat (punctuate comma (map ppr_amode as)),pp_paren_semi]
287 pprAbsC stmt@(CCallTypedef op@(CCallOp op_str is_asm may_gc cconv) results args) _
288 = hsep [ ptext SLIT("typedef")
291 , parens (hsep (punctuate comma ccall_decl_ty_args))
294 fun_nm = parens (text (callConvAttribute cconv) <+> char '*' <> ccall_fun_ty)
298 Right u -> ptext SLIT("_ccall_fun_ty") <> ppr u
301 case non_void_results of
302 [] -> ptext SLIT("void")
303 [amode] -> text (showPrimRep (getAmodeRep amode))
304 _ -> panic "pprAbsC{CCallTypedef}: ccall_res_ty"
306 ccall_decl_ty_args = tail ccall_arg_tys
307 ccall_arg_tys = map (text.showPrimRep.getAmodeRep) non_void_args
309 -- the first argument will be the "I/O world" token (a VoidRep)
310 -- all others should be non-void
313 in ASSERT (all non_void nvas) nvas
315 -- there will usually be two results: a (void) state which we
316 -- should ignore and a (possibly void) result.
318 let nvrs = grab_non_void_amodes results
319 in ASSERT (length nvrs <= 1) nvrs
321 pprAbsC (CCodeBlock label abs_C) _
322 = if not (maybeToBool(nonemptyAbsC abs_C)) then
323 pprTrace "pprAbsC: curious empty code block for" (pprCLabel label) empty
325 case (pprTempAndExternDecls abs_C) of { (pp_temps, pp_exts) ->
327 hcat [text (if (externallyVisibleCLabel label)
328 then "FN_(" -- abbreviations to save on output
330 pprCLabel label, text ") {"],
334 nest 8 (ptext SLIT("FB_")),
335 nest 8 (pprAbsC abs_C (costs abs_C)),
336 nest 8 (ptext SLIT("FE_")),
341 pprAbsC (CInitHdr cl_info reg_rel cost_centre) _
342 = hcat [ ptext SLIT("SET_HDR_"), char '(',
343 ppr_amode (CAddr reg_rel), comma,
344 pprCLabelAddr info_lbl, comma,
345 if_profiling (pprAmode cost_centre),
348 info_lbl = infoTableLabelFromCI cl_info
350 pprAbsC stmt@(CStaticClosure closure_lbl cl_info cost_centre amodes) _
351 = case (pprTempAndExternDecls stmt) of { (_, pp_exts) ->
355 ptext SLIT("SET_STATIC_HDR"), char '(',
356 pprCLabel closure_lbl, comma,
357 pprCLabel info_lbl, comma,
358 if_profiling (pprAmode cost_centre), comma,
359 ppLocalness closure_lbl, comma,
360 ppLocalnessMacro True{-include dyn-} info_lbl,
363 nest 2 (ppr_payload (amodes ++ padding_wds ++ static_link_field)),
367 info_lbl = infoTableLabelFromCI cl_info
369 ppr_payload [] = empty
370 ppr_payload ls = comma <+>
371 braces (hsep (punctuate comma (map ((text "(L_)" <>).ppr_item) ls)))
374 | rep == VoidRep = text "0" -- might not even need this...
375 | rep == FloatRep = ppr_amode (floatToWord item)
376 | rep == DoubleRep = hcat (punctuate (text ", (L_)")
377 (map ppr_amode (doubleToWords item)))
378 | otherwise = ppr_amode item
380 rep = getAmodeRep item
383 if not (closureUpdReqd cl_info) then
386 case max 0 (mIN_UPD_SIZE - length amodes) of { still_needed ->
387 nOfThem still_needed (mkIntCLit 0) } -- a bunch of 0s
390 | staticClosureNeedsLink cl_info = [mkIntCLit 0]
393 pprAbsC stmt@(CClosureInfoAndCode cl_info slow maybe_fast cl_descr) _
396 ptext SLIT("INFO_TABLE"),
397 ( if is_selector then
398 ptext SLIT("_SELECTOR")
399 else if is_constr then
400 ptext SLIT("_CONSTR")
401 else if needs_srt then
403 else empty ), char '(',
405 pprCLabel info_lbl, comma,
406 pprCLabel slow_lbl, comma,
407 pp_rest, {- ptrs,nptrs,[srt,]type,-} comma,
409 ppLocalness info_lbl, comma,
410 ppLocalnessMacro True{-include dyn-} slow_lbl, comma,
412 if_profiling pp_descr, comma,
413 if_profiling pp_type,
419 Just fast -> let stuff = CCodeBlock fast_lbl fast in
420 pprAbsC stuff (costs stuff)
423 info_lbl = infoTableLabelFromCI cl_info
424 fast_lbl = fastLabelFromCI cl_info
427 = case (nonemptyAbsC slow) of
428 Nothing -> (mkErrorStdEntryLabel, empty)
429 Just xx -> (entryLabelFromCI cl_info,
430 let stuff = CCodeBlock slow_lbl xx in
431 pprAbsC stuff (costs stuff))
433 maybe_selector = maybeSelectorInfo cl_info
434 is_selector = maybeToBool maybe_selector
435 (Just select_word_i) = maybe_selector
437 maybe_tag = closureSemiTag cl_info
438 is_constr = maybeToBool maybe_tag
439 (Just tag) = maybe_tag
441 needs_srt = infoTblNeedsSRT cl_info
442 srt = getSRTInfo cl_info
444 size = closureNonHdrSize cl_info
446 ptrs = closurePtrsSize cl_info
449 pp_rest | is_selector = int select_word_i
454 hcat [ int tag, comma ]
455 else if needs_srt then
460 type_str = pprSMRep (closureSMRep cl_info)
462 pp_descr = hcat [char '"', text (stringToC cl_descr), char '"']
463 pp_type = hcat [char '"', text (stringToC (closureTypeDescr cl_info)), char '"']
465 pprAbsC stmt@(CClosureTbl tycon) _
467 ptext SLIT("CLOSURE_TBL") <>
468 lparen <> pprCLabel (mkClosureTblLabel tycon) <> rparen :
470 map (pp_closure_lbl . mkStaticClosureLabel . getName) (tyConDataCons tycon)
472 ) $$ ptext SLIT("};")
474 pprAbsC stmt@(CRetDirect uniq code srt liveness) _
477 ptext SLIT("INFO_TABLE_SRT_BITMAP"), lparen,
478 pprCLabel info_lbl, comma,
479 pprCLabel entry_lbl, comma,
480 pp_liveness liveness, comma, -- bitmap
481 pp_srt_info srt, -- SRT
482 ptext type_str, comma, -- closure type
483 ppLocalness info_lbl, comma, -- info table storage class
484 ppLocalnessMacro True{-include dyn-} entry_lbl, comma, -- entry pt storage class
491 info_lbl = mkReturnInfoLabel uniq
492 entry_lbl = mkReturnPtLabel uniq
494 pp_code = let stuff = CCodeBlock entry_lbl code in
495 pprAbsC stuff (costs stuff)
497 type_str = case liveness of
498 LvSmall _ -> SLIT("RET_SMALL")
499 LvLarge _ -> SLIT("RET_BIG")
501 pprAbsC stmt@(CRetVector label amodes srt liveness) _
502 = case (pprTempAndExternDecls stmt) of { (_, pp_exts) ->
506 ptext SLIT("VEC_INFO_") <> int size,
508 pprCLabel label, comma,
509 pp_liveness liveness, comma, -- bitmap liveness mask
510 pp_srt_info srt, -- SRT
511 ptext type_str, comma,
512 ppLocalness label, comma
514 nest 2 (sep (punctuate comma (map ppr_item amodes))),
520 ppr_item item = (<>) (text "(F_) ") (ppr_amode item)
523 type_str = case liveness of
524 LvSmall _ -> SLIT("RET_VEC_SMALL")
525 LvLarge _ -> SLIT("RET_VEC_BIG")
528 pprAbsC (CCostCentreDecl is_local cc) _ = pprCostCentreDecl is_local cc
529 pprAbsC (CCostCentreStackDecl ccs) _ = pprCostCentreStackDecl ccs
534 = if (externallyVisibleCLabel label)
536 else ptext SLIT("static ")
538 -- Horrible macros for declaring the types and locality of labels (see
541 ppLocalnessMacro include_dyn_prefix clabel =
546 ClosureType -> ptext SLIT("C_")
547 CodeType -> ptext SLIT("F_")
548 InfoTblType -> ptext SLIT("I_")
549 ClosureTblType -> ptext SLIT("CP_")
550 DataType -> ptext SLIT("D_")
553 is_visible = externallyVisibleCLabel clabel
554 label_type = labelType clabel
555 is_dynamic = labelDynamic clabel
558 | is_visible = char 'E'
559 | otherwise = char 'I'
562 | not include_dyn_prefix = empty
563 | is_dynamic = char 'D'
571 grab_non_void_amodes amodes
572 = filter non_void amodes
575 = case (getAmodeRep amode) of
581 ppr_vol_regs :: [MagicId] -> (SDoc, SDoc)
583 ppr_vol_regs [] = (empty, empty)
584 ppr_vol_regs (VoidReg:rs) = ppr_vol_regs rs
586 = let pp_reg = case r of
587 VanillaReg pk n -> pprVanillaReg n
589 (more_saves, more_restores) = ppr_vol_regs rs
591 (($$) ((<>) (ptext SLIT("CALLER_SAVE_")) pp_reg) more_saves,
592 ($$) ((<>) (ptext SLIT("CALLER_RESTORE_")) pp_reg) more_restores)
594 -- pp_basic_{saves,restores}: The BaseReg, SpA, SuA, SpB, SuB, Hp and
595 -- HpLim (see StgRegs.lh) may need to be saved/restored around CCalls,
596 -- depending on the platform. (The "volatile regs" stuff handles all
597 -- other registers.) Just be *sure* BaseReg is OK before trying to do
598 -- anything else. The correct sequence of saves&restores are
599 -- encoded by the CALLER_*_SYSTEM macros.
602 [ ptext SLIT("CALLER_SAVE_Base")
603 , ptext SLIT("CALLER_SAVE_SYSTEM")
606 pp_basic_restores = ptext SLIT("CALLER_RESTORE_SYSTEM")
610 has_srt (_, NoSRT) = False
619 (lbl, SRT off len) ->
620 hcat [ pprCLabel lbl, comma,
627 | labelDynamic lbl = text "DLL_SRT_ENTRY" <> parens (pprCLabel lbl)
628 | otherwise = char '&' <> pprCLabel lbl
633 = if opt_SccProfilingOn
635 else char '0' -- leave it out!
636 -- ---------------------------------------------------------------------------
637 -- Changes for GrAnSim:
638 -- draw costs for computation in head of if into both branches;
639 -- as no abstractC data structure is given for the head, one is constructed
640 -- guessing unknown values and fed into the costs function
641 -- ---------------------------------------------------------------------------
643 do_if_stmt discrim tag alt_code deflt c
645 -- This special case happens when testing the result of a comparison.
646 -- We can just avoid some redundant clutter in the output.
647 MachInt n _ | n==0 -> ppr_if_stmt (pprAmode discrim)
649 (addrModeCosts discrim Rhs) c
651 cond = hcat [ pprAmode discrim
654 , pprAmode (CLit tag)
656 -- to be absolutely sure that none of the
657 -- conversion rules hit, e.g.,
659 -- minInt is different to (int)minInt
661 -- in C (when minInt is a number not a constant
662 -- expression which evaluates to it.)
666 MachInt _ signed | signed -> ptext SLIT("(I_)")
671 (addrModeCosts discrim Rhs) c
673 ppr_if_stmt pp_pred then_part else_part discrim_costs c
675 hcat [text "if (", pp_pred, text ") {"],
676 nest 8 (pprAbsC then_part (c + discrim_costs +
677 (Cost (0, 2, 0, 0, 0)) +
679 (case nonemptyAbsC else_part of Nothing -> empty; Just _ -> text "} else {"),
680 nest 8 (pprAbsC else_part (c + discrim_costs +
681 (Cost (0, 1, 0, 0, 0)) +
684 {- Total costs = inherited costs (before if) + costs for accessing discrim
685 + costs for cond branch ( = (0, 1, 0, 0, 0) )
686 + costs for that alternative
690 Historical note: this used to be two separate cases -- one for `ccall'
691 and one for `casm'. To get round a potential limitation to only 10
692 arguments, the numbering of arguments in @process_casm@ was beefed up a
695 Some rough notes on generating code for @CCallOp@:
697 1) Evaluate all arguments and stuff them into registers. (done elsewhere)
698 2) Save any essential registers (heap, stack, etc).
700 ToDo: If stable pointers are in use, these must be saved in a place
701 where the runtime system can get at them so that the Stg world can
702 be restarted during the call.
704 3) Save any temporary registers that are currently in use.
705 4) Do the call, putting result into a local variable
706 5) Restore essential registers
707 6) Restore temporaries
709 (This happens after restoration of essential registers because we
710 might need the @Base@ register to access all the others correctly.)
712 Otherwise, copy local variable into result register.
714 8) If ccall (not casm), declare the function being called as extern so
715 that C knows if it returns anything other than an int.
718 { ResultType _ccall_result;
721 _ccall_result = f( args );
725 return_reg = _ccall_result;
729 Amendment to the above: if we can GC, we have to:
731 * make sure we save all our registers away where the garbage collector
733 * be sure that there are no live registers or we're in trouble.
734 (This can cause problems if you try something foolish like passing
735 an array or a foreign obj to a _ccall_GC_ thing.)
736 * increment/decrement the @inCCallGC@ counter before/after the call so
737 that the runtime check that PerformGC is being used sensibly will work.
740 pprCCall op@(CCallOp op_str is_asm may_gc cconv) args results vol_regs
743 declare_local_vars, -- local var for *result*
744 vcat local_arg_decls,
746 declare_fun_extern, -- declare expected function type.
747 process_casm local_vars pp_non_void_args casm_str,
753 (pp_saves, pp_restores) = ppr_vol_regs vol_regs
754 (pp_save_context, pp_restore_context)
755 | may_gc = ( text "do { SaveThreadState();"
756 , text "LoadThreadState();} while(0);"
758 | otherwise = ( pp_basic_saves $$ pp_saves,
759 pp_basic_restores $$ pp_restores)
763 in ASSERT (all non_void nvas) nvas
764 -- the first argument will be the "I/O world" token (a VoidRep)
765 -- all others should be non-void
768 let nvrs = grab_non_void_amodes results
769 in ASSERT (length nvrs <= 1) nvrs
770 -- there will usually be two results: a (void) state which we
771 -- should ignore and a (possibly void) result.
773 (local_arg_decls, pp_non_void_args)
774 = unzip [ ppr_casm_arg a i | (a,i) <- non_void_args `zip` [1..] ]
778 In the non-casm case, to ensure that we're entering the given external
779 entry point using the correct calling convention, we have to do the following:
781 - When entering via a function pointer (the `dynamic' case) using the specified
782 calling convention, we emit a typedefn declaration attributed with the
783 calling convention to use together with the result and parameter types we're
784 assuming. Coerce the function pointer to this type and go.
786 - to enter the function at a given code label, we emit an extern declaration
787 for the label here, stating the calling convention together with result and
788 argument types we're assuming.
790 The C compiler will hopefully use this extern declaration to good effect,
791 reporting any discrepancies between our extern decl and any other that
794 Re: calling convention, notice that gcc (2.8.1 and egcs-1.0.2) will for
795 the external function `foo' use the calling convention of the first `foo'
796 prototype it encounters (nor does it complain about conflicting attribute
797 declarations). The consequence of this is that you cannot override the
798 calling convention of `foo' using an extern declaration (you'd have to use
799 a typedef), but why you would want to do such a thing in the first place
800 is totally beyond me.
802 ToDo: petition the gcc folks to add code to warn about conflicting attribute
807 | is_dynamic || is_asm || not opt_EmitCExternDecls = empty
809 hsep [ typedef_or_extern
812 , parens (hsep (punctuate comma ccall_decl_ty_args))
816 | is_dynamic = ptext SLIT("typedef")
817 | otherwise = ptext SLIT("extern")
820 | is_dynamic = parens (text (callConvAttribute cconv) <+> char '*' <> ccall_fun_ty)
821 | otherwise = text (callConvAttribute cconv) <+> ptext asm_str
823 -- leave out function pointer
825 | is_dynamic = tail ccall_arg_tys
826 | otherwise = ccall_arg_tys
828 ccall_arg_tys = map (text.showPrimRep.getAmodeRep) non_void_args
831 case non_void_results of
832 [] -> ptext SLIT("void")
833 [amode] -> text (showPrimRep (getAmodeRep amode))
834 _ -> panic "pprCCall: ccall_res_ty"
837 ptext SLIT("_ccall_fun_ty") <>
842 (declare_local_vars, local_vars, assign_results)
843 = ppr_casm_results non_void_results
845 (Left asm_str) = op_str
851 casm_str = if is_asm then _UNPK_ asm_str else ccall_str
853 -- Remainder only used for ccall
856 | is_dynamic = parens (parens (ccall_fun_ty) <> text "%0")
857 | otherwise = ptext asm_str
861 if null non_void_results
864 lparen, fun_name, lparen,
865 hcat (punctuate comma ccall_fun_args),
870 | is_dynamic = tail ccall_args
871 | otherwise = ccall_args
873 ccall_args = zipWith (\ _ i -> char '%' <> int i) non_void_args [0..]
877 If the argument is a heap object, we need to reach inside and pull out
878 the bit the C world wants to see. The only heap objects which can be
879 passed are @Array@s and @ByteArray@s.
882 ppr_casm_arg :: CAddrMode -> Int -> (SDoc, SDoc)
883 -- (a) decl and assignment, (b) local var to be used later
885 ppr_casm_arg amode a_num
887 a_kind = getAmodeRep amode
888 pp_amode = pprAmode amode
889 pp_kind = pprPrimKind a_kind
891 local_var = (<>) (ptext SLIT("_ccall_arg")) (int a_num)
893 (arg_type, pp_amode2)
896 -- for array arguments, pass a pointer to the body of the array
897 -- (PTRS_ARR_CTS skips over all the header nonsense)
898 ArrayRep -> (pp_kind,
899 hcat [ptext SLIT("PTRS_ARR_CTS"),char '(', pp_amode, rparen])
900 ByteArrayRep -> (pp_kind,
901 hcat [ptext SLIT("BYTE_ARR_CTS"),char '(', pp_amode, rparen])
903 -- for ForeignObj, use FOREIGN_OBJ_DATA to fish out the contents.
904 ForeignObjRep -> (pp_kind,
905 hcat [ptext SLIT("ForeignObj_CLOSURE_DATA"),
906 char '(', pp_amode, char ')'])
908 other -> (pp_kind, pp_amode)
911 = hcat [ arg_type, space, local_var, equals, pp_amode2, semi ]
913 (declare_local_var, local_var)
916 For l-values, the critical questions are:
918 1) Are there any results at all?
920 We only allow zero or one results.
924 :: [CAddrMode] -- list of results (length <= 1)
926 ( SDoc, -- declaration of any local vars
927 [SDoc], -- list of result vars (same length as results)
928 SDoc ) -- assignment (if any) of results in local var to registers
931 = (empty, [], empty) -- no results
935 result_reg = ppr_amode r
936 r_kind = getAmodeRep r
938 local_var = ptext SLIT("_ccall_result")
940 (result_type, assign_result)
941 = (pprPrimKind r_kind,
942 hcat [ result_reg, equals, local_var, semi ])
944 declare_local_var = hcat [ result_type, space, local_var, semi ]
946 (declare_local_var, [local_var], assign_result)
949 = panic "ppr_casm_results: ccall/casm with many results"
953 Note the sneaky way _the_ result is represented by a list so that we
954 can complain if it's used twice.
956 ToDo: Any chance of giving line numbers when process-casm fails?
957 Or maybe we should do a check _much earlier_ in compiler. ADR
960 process_casm :: [SDoc] -- results (length <= 1)
961 -> [SDoc] -- arguments
962 -> String -- format string (with embedded %'s)
963 -> SDoc -- code being generated
965 process_casm results args string = process results args string
967 process [] _ "" = empty
968 process (_:_) _ "" = error ("process_casm: non-void result not assigned while processing _casm_ \"" ++
970 "\"\n(Try changing result type to PrimIO ()\n")
972 process ress args ('%':cs)
975 error ("process_casm: lonely % while processing _casm_ \"" ++ string ++ "\".\n")
978 char '%' <> process ress args css
982 [] -> error ("process_casm: no result to match %r while processing _casm_ \"" ++ string ++ "\".\nTry deleting %r or changing result type from PrimIO ()\n")
983 [r] -> r <> (process [] args css)
984 _ -> panic ("process_casm: casm with many results while processing _casm_ \"" ++ string ++ "\".\n")
988 read_int :: ReadS Int
991 case (read_int other) of
993 if 0 <= num && num < length args
994 then parens (args !! num) <> process ress args css
995 else error ("process_casm: no such arg #:"++(show num)++" while processing \"" ++ string ++ "\".\n")
996 _ -> error ("process_casm: not %<num> while processing _casm_ \"" ++ string ++ "\".\n")
998 process ress args (other_c:cs)
999 = char other_c <> process ress args cs
1002 %************************************************************************
1004 \subsection[a2r-assignments]{Assignments}
1006 %************************************************************************
1008 Printing assignments is a little tricky because of type coercion.
1010 First of all, the kind of the thing being assigned can be gotten from
1011 the destination addressing mode. (It should be the same as the kind
1012 of the source addressing mode.) If the kind of the assignment is of
1013 @VoidRep@, then don't generate any code at all.
1016 pprAssign :: PrimRep -> CAddrMode -> CAddrMode -> SDoc
1018 pprAssign VoidRep dest src = empty
1021 Special treatment for floats and doubles, to avoid unwanted conversions.
1024 pprAssign FloatRep dest@(CVal reg_rel _) src
1025 = hcat [ ptext SLIT("ASSIGN_FLT"),char '(', ppr_amode (CAddr reg_rel), comma, pprAmode src, pp_paren_semi ]
1027 pprAssign DoubleRep dest@(CVal reg_rel _) src
1028 = hcat [ ptext SLIT("ASSIGN_DBL"),char '(', ppr_amode (CAddr reg_rel), comma, pprAmode src, pp_paren_semi ]
1030 pprAssign Int64Rep dest@(CVal reg_rel _) src
1031 = hcat [ ptext SLIT("ASSIGN_Int64"),char '(', ppr_amode (CAddr reg_rel), comma, pprAmode src, pp_paren_semi ]
1032 pprAssign Word64Rep dest@(CVal reg_rel _) src
1033 = hcat [ ptext SLIT("ASSIGN_Word64"),char '(', ppr_amode (CAddr reg_rel), comma, pprAmode src, pp_paren_semi ]
1036 Lastly, the question is: will the C compiler think the types of the
1037 two sides of the assignment match?
1039 We assume that the types will match
1040 if neither side is a @CVal@ addressing mode for any register
1041 which can point into the heap or B stack.
1043 Why? Because the heap and B stack are used to store miscellaneous things,
1044 whereas the A stack, temporaries, registers, etc., are only used for things
1048 pprAssign kind (CReg (VanillaReg _ dest)) (CReg (VanillaReg _ src))
1049 = hcat [ pprVanillaReg dest, equals,
1050 pprVanillaReg src, semi ]
1052 pprAssign kind dest src
1053 | mixedTypeLocn dest
1054 -- Add in a cast to StgWord (a.k.a. W_) iff the destination is mixed
1055 = hcat [ ppr_amode dest, equals,
1056 text "(W_)(", -- Here is the cast
1057 ppr_amode src, pp_paren_semi ]
1059 pprAssign kind dest src
1060 | mixedPtrLocn dest && getAmodeRep src /= PtrRep
1061 -- Add in a cast to StgPtr (a.k.a. P_) iff the destination is mixed
1062 = hcat [ ppr_amode dest, equals,
1063 text "(P_)(", -- Here is the cast
1064 ppr_amode src, pp_paren_semi ]
1066 pprAssign ByteArrayRep dest src
1068 -- Add in a cast iff the source is mixed
1069 = hcat [ ppr_amode dest, equals,
1070 text "(StgByteArray)(", -- Here is the cast
1071 ppr_amode src, pp_paren_semi ]
1073 pprAssign kind other_dest src
1074 = hcat [ ppr_amode other_dest, equals,
1075 pprAmode src, semi ]
1079 %************************************************************************
1081 \subsection[a2r-CAddrModes]{Addressing modes}
1083 %************************************************************************
1085 @pprAmode@ is used to print r-values (which may need casts), whereas
1086 @ppr_amode@ is used for l-values {\em and} as a help function for
1090 pprAmode, ppr_amode :: CAddrMode -> SDoc
1093 For reasons discussed above under assignments, @CVal@ modes need
1094 to be treated carefully. First come special cases for floats and doubles,
1095 similar to those in @pprAssign@:
1097 (NB: @PK_FLT@ and @PK_DBL@ require the {\em address} of the value in
1101 pprAmode (CVal reg_rel FloatRep)
1102 = hcat [ text "PK_FLT(", ppr_amode (CAddr reg_rel), rparen ]
1103 pprAmode (CVal reg_rel DoubleRep)
1104 = hcat [ text "PK_DBL(", ppr_amode (CAddr reg_rel), rparen ]
1105 pprAmode (CVal reg_rel Int64Rep)
1106 = hcat [ text "PK_Int64(", ppr_amode (CAddr reg_rel), rparen ]
1107 pprAmode (CVal reg_rel Word64Rep)
1108 = hcat [ text "PK_Word64(", ppr_amode (CAddr reg_rel), rparen ]
1111 Next comes the case where there is some other cast need, and the
1116 | mixedTypeLocn amode
1117 = parens (hcat [ pprPrimKind (getAmodeRep amode), ptext SLIT(")("),
1119 | otherwise -- No cast needed
1123 Now the rest of the cases for ``workhorse'' @ppr_amode@:
1126 ppr_amode (CVal reg_rel _)
1127 = case (pprRegRelative False{-no sign wanted-} reg_rel) of
1128 (pp_reg, Nothing) -> (<>) (char '*') pp_reg
1129 (pp_reg, Just offset) -> hcat [ pp_reg, brackets offset ]
1131 ppr_amode (CAddr reg_rel)
1132 = case (pprRegRelative True{-sign wanted-} reg_rel) of
1133 (pp_reg, Nothing) -> pp_reg
1134 (pp_reg, Just offset) -> (<>) pp_reg offset
1136 ppr_amode (CReg magic_id) = pprMagicId magic_id
1138 ppr_amode (CTemp uniq kind) = char '_' <> pprUnique uniq <> char '_'
1140 ppr_amode (CLbl label kind) = pprCLabelAddr label
1142 ppr_amode (CCharLike ch)
1143 = hcat [ptext SLIT("CHARLIKE_CLOSURE"), char '(', pprAmode ch, rparen ]
1144 ppr_amode (CIntLike int)
1145 = hcat [ptext SLIT("INTLIKE_CLOSURE"), char '(', pprAmode int, rparen ]
1147 ppr_amode (CString str) = hcat [char '"', text (stringToC (_UNPK_ str)), char '"']
1148 -- ToDo: are these *used* for anything?
1150 ppr_amode (CLit lit) = pprBasicLit lit
1152 ppr_amode (CLitLit str _) = ptext str
1154 ppr_amode (CJoinPoint _)
1155 = panic "ppr_amode: CJoinPoint"
1157 ppr_amode (CTableEntry base index kind)
1158 = hcat [text "((", pprPrimKind kind, text " *)(",
1159 ppr_amode base, text "))[(I_)(", ppr_amode index,
1162 ppr_amode (CMacroExpr pk macro as)
1163 = parens (pprPrimKind pk) <+>
1164 parens (text (show macro) <>
1165 parens (hcat (punctuate comma (map pprAmode as))))
1168 %************************************************************************
1170 \subsection[ppr-liveness-masks]{Liveness Masks}
1172 %************************************************************************
1175 pp_liveness :: Liveness -> SDoc
1178 LvSmall mask -> int (intBS mask)
1179 LvLarge lbl -> char '&' <> pprCLabel lbl
1182 %************************************************************************
1184 \subsection[a2r-MagicIds]{Magic ids}
1186 %************************************************************************
1188 @pprRegRelative@ returns a pair of the @Doc@ for the register
1189 (some casting may be required), and a @Maybe Doc@ for the offset
1190 (zero offset gives a @Nothing@).
1193 addPlusSign :: Bool -> SDoc -> SDoc
1194 addPlusSign False p = p
1195 addPlusSign True p = (<>) (char '+') p
1197 pprSignedInt :: Bool -> Int -> Maybe SDoc -- Nothing => 0
1198 pprSignedInt sign_wanted n
1199 = if n == 0 then Nothing else
1200 if n > 0 then Just (addPlusSign sign_wanted (int n))
1203 pprRegRelative :: Bool -- True <=> Print leading plus sign (if +ve)
1205 -> (SDoc, Maybe SDoc)
1207 pprRegRelative sign_wanted (SpRel off)
1208 = (pprMagicId Sp, pprSignedInt sign_wanted (I# off))
1210 pprRegRelative sign_wanted r@(HpRel o)
1211 = let pp_Hp = pprMagicId Hp; off = I# o
1216 (pp_Hp, Just ((<>) (char '-') (int off)))
1218 pprRegRelative sign_wanted (NodeRel o)
1219 = let pp_Node = pprMagicId node; off = I# o
1224 (pp_Node, Just (addPlusSign sign_wanted (int off)))
1228 @pprMagicId@ just prints the register name. @VanillaReg@ registers are
1229 represented by a discriminated union (@StgUnion@), so we use the @PrimRep@
1230 to select the union tag.
1233 pprMagicId :: MagicId -> SDoc
1235 pprMagicId BaseReg = ptext SLIT("BaseReg")
1236 pprMagicId (VanillaReg pk n)
1237 = hcat [ pprVanillaReg n, char '.',
1239 pprMagicId (FloatReg n) = (<>) (ptext SLIT("F")) (int IBOX(n))
1240 pprMagicId (DoubleReg n) = (<>) (ptext SLIT("D")) (int IBOX(n))
1241 pprMagicId (LongReg _ n) = (<>) (ptext SLIT("L")) (int IBOX(n))
1242 pprMagicId Sp = ptext SLIT("Sp")
1243 pprMagicId Su = ptext SLIT("Su")
1244 pprMagicId SpLim = ptext SLIT("SpLim")
1245 pprMagicId Hp = ptext SLIT("Hp")
1246 pprMagicId HpLim = ptext SLIT("HpLim")
1247 pprMagicId CurCostCentre = ptext SLIT("CCCS")
1248 pprMagicId VoidReg = panic "pprMagicId:VoidReg!"
1250 pprVanillaReg :: FAST_INT -> SDoc
1251 pprVanillaReg n = (<>) (char 'R') (int IBOX(n))
1253 pprUnionTag :: PrimRep -> SDoc
1255 pprUnionTag PtrRep = char 'p'
1256 pprUnionTag CodePtrRep = ptext SLIT("fp")
1257 pprUnionTag DataPtrRep = char 'd'
1258 pprUnionTag RetRep = char 'p'
1259 pprUnionTag CostCentreRep = panic "pprUnionTag:CostCentre?"
1261 pprUnionTag CharRep = char 'c'
1262 pprUnionTag IntRep = char 'i'
1263 pprUnionTag WordRep = char 'w'
1264 pprUnionTag AddrRep = char 'a'
1265 pprUnionTag FloatRep = char 'f'
1266 pprUnionTag DoubleRep = panic "pprUnionTag:Double?"
1268 pprUnionTag StablePtrRep = char 'i'
1269 pprUnionTag StableNameRep = char 'p'
1270 pprUnionTag WeakPtrRep = char 'p'
1271 pprUnionTag ForeignObjRep = char 'p'
1273 pprUnionTag ThreadIdRep = char 't'
1275 pprUnionTag ArrayRep = char 'p'
1276 pprUnionTag ByteArrayRep = char 'b'
1278 pprUnionTag _ = panic "pprUnionTag:Odd kind"
1282 Find and print local and external declarations for a list of
1283 Abstract~C statements.
1285 pprTempAndExternDecls :: AbstractC -> (SDoc{-temps-}, SDoc{-externs-})
1286 pprTempAndExternDecls AbsCNop = (empty, empty)
1288 pprTempAndExternDecls (AbsCStmts stmt1 stmt2)
1289 = initTE (ppr_decls_AbsC stmt1 `thenTE` \ (t_p1, e_p1) ->
1290 ppr_decls_AbsC stmt2 `thenTE` \ (t_p2, e_p2) ->
1291 case (catMaybes [t_p1, t_p2]) of { real_temps ->
1292 case (catMaybes [e_p1, e_p2]) of { real_exts ->
1293 returnTE (vcat real_temps, vcat real_exts) }}
1296 pprTempAndExternDecls other_stmt
1297 = initTE (ppr_decls_AbsC other_stmt `thenTE` \ (maybe_t, maybe_e) ->
1308 pprBasicLit :: Literal -> SDoc
1309 pprPrimKind :: PrimRep -> SDoc
1311 pprBasicLit lit = ppr lit
1312 pprPrimKind k = ppr k
1316 %************************************************************************
1318 \subsection[a2r-monad]{Monadery}
1320 %************************************************************************
1322 We need some monadery to keep track of temps and externs we have already
1323 printed. This info must be threaded right through the Abstract~C, so
1324 it's most convenient to hide it in this monad.
1326 WDP 95/02: Switched from \tr{([Unique], [CLabel])} to
1327 \tr{(UniqSet, CLabelSet)}. Allegedly for efficiency.
1330 type CLabelSet = FiniteMap CLabel (){-any type will do-}
1331 emptyCLabelSet = emptyFM
1332 x `elementOfCLabelSet` labs
1333 = case (lookupFM labs x) of { Just _ -> True; Nothing -> False }
1335 addToCLabelSet set x = addToFM set x ()
1337 type TEenv = (UniqSet Unique, CLabelSet)
1339 type TeM result = TEenv -> (TEenv, result)
1341 initTE :: TeM a -> a
1343 = case sa (emptyUniqSet, emptyCLabelSet) of { (_, result) ->
1346 {-# INLINE thenTE #-}
1347 {-# INLINE returnTE #-}
1349 thenTE :: TeM a -> (a -> TeM b) -> TeM b
1351 = case a u of { (u_1, result_of_a) ->
1354 mapTE :: (a -> TeM b) -> [a] -> TeM [b]
1355 mapTE f [] = returnTE []
1357 = f x `thenTE` \ r ->
1358 mapTE f xs `thenTE` \ rs ->
1361 returnTE :: a -> TeM a
1362 returnTE result env = (env, result)
1364 -- these next two check whether the thing is already
1365 -- recorded, and THEN THEY RECORD IT
1366 -- (subsequent calls will return False for the same uniq/label)
1368 tempSeenTE :: Unique -> TeM Bool
1369 tempSeenTE uniq env@(seen_uniqs, seen_labels)
1370 = if (uniq `elementOfUniqSet` seen_uniqs)
1372 else ((addOneToUniqSet seen_uniqs uniq,
1376 labelSeenTE :: CLabel -> TeM Bool
1377 labelSeenTE label env@(seen_uniqs, seen_labels)
1378 = if (label `elementOfCLabelSet` seen_labels)
1381 addToCLabelSet seen_labels label),
1386 pprTempDecl :: Unique -> PrimRep -> SDoc
1387 pprTempDecl uniq kind
1388 = hcat [ pprPrimKind kind, space, char '_', pprUnique uniq, ptext SLIT("_;") ]
1390 pprExternDecl :: Bool -> CLabel -> SDoc
1391 pprExternDecl in_srt clabel
1392 | not (needsCDecl clabel) = empty -- do not print anything for "known external" things
1394 hcat [ ppLocalnessMacro (not in_srt) clabel,
1395 lparen, dyn_wrapper (pprCLabel clabel), pp_paren_semi ]
1398 | in_srt && labelDynamic clabel = text "DLL_IMPORT_DATA_VAR" <> parens d
1404 ppr_decls_AbsC :: AbstractC -> TeM (Maybe SDoc{-temps-}, Maybe SDoc{-externs-})
1406 ppr_decls_AbsC AbsCNop = returnTE (Nothing, Nothing)
1408 ppr_decls_AbsC (AbsCStmts stmts_1 stmts_2)
1409 = ppr_decls_AbsC stmts_1 `thenTE` \ p1 ->
1410 ppr_decls_AbsC stmts_2 `thenTE` \ p2 ->
1411 returnTE (maybe_vcat [p1, p2])
1413 ppr_decls_AbsC (CSplitMarker) = returnTE (Nothing, Nothing)
1415 ppr_decls_AbsC (CAssign dest source)
1416 = ppr_decls_Amode dest `thenTE` \ p1 ->
1417 ppr_decls_Amode source `thenTE` \ p2 ->
1418 returnTE (maybe_vcat [p1, p2])
1420 ppr_decls_AbsC (CJump target) = ppr_decls_Amode target
1422 ppr_decls_AbsC (CFallThrough target) = ppr_decls_Amode target
1424 ppr_decls_AbsC (CReturn target _) = ppr_decls_Amode target
1426 ppr_decls_AbsC (CSwitch discrim alts deflt)
1427 = ppr_decls_Amode discrim `thenTE` \ pdisc ->
1428 mapTE ppr_alt_stuff alts `thenTE` \ palts ->
1429 ppr_decls_AbsC deflt `thenTE` \ pdeflt ->
1430 returnTE (maybe_vcat (pdisc:pdeflt:palts))
1432 ppr_alt_stuff (_, absC) = ppr_decls_AbsC absC
1434 ppr_decls_AbsC (CCodeBlock label absC)
1435 = ppr_decls_AbsC absC
1437 ppr_decls_AbsC (CInitHdr cl_info reg_rel cost_centre)
1438 -- ToDo: strictly speaking, should chk "cost_centre" amode
1439 = labelSeenTE info_lbl `thenTE` \ label_seen ->
1444 Just (pprExternDecl False{-not in an SRT decl-} info_lbl))
1446 info_lbl = infoTableLabelFromCI cl_info
1448 ppr_decls_AbsC (COpStmt results _ args _) = ppr_decls_Amodes (results ++ args)
1449 ppr_decls_AbsC (CSimultaneous abc) = ppr_decls_AbsC abc
1451 ppr_decls_AbsC (CCheck _ amodes code) =
1452 ppr_decls_Amodes amodes `thenTE` \p1 ->
1453 ppr_decls_AbsC code `thenTE` \p2 ->
1454 returnTE (maybe_vcat [p1,p2])
1456 ppr_decls_AbsC (CMacroStmt _ amodes) = ppr_decls_Amodes amodes
1458 ppr_decls_AbsC (CCallProfCtrMacro _ amodes) = ppr_decls_Amodes [] -- *****!!!
1459 -- you get some nasty re-decls of stdio.h if you compile
1460 -- the prelude while looking inside those amodes;
1461 -- no real reason to, anyway.
1462 ppr_decls_AbsC (CCallProfCCMacro _ amodes) = ppr_decls_Amodes amodes
1464 ppr_decls_AbsC (CStaticClosure closure_lbl closure_info cost_centre amodes)
1465 -- ToDo: strictly speaking, should chk "cost_centre" amode
1466 = ppr_decls_Amodes amodes
1468 ppr_decls_AbsC (CClosureInfoAndCode cl_info slow maybe_fast _)
1469 = ppr_decls_Amodes [entry_lbl] `thenTE` \ p1 ->
1470 ppr_decls_AbsC slow `thenTE` \ p2 ->
1472 Nothing -> returnTE (Nothing, Nothing)
1473 Just fast -> ppr_decls_AbsC fast) `thenTE` \ p3 ->
1474 returnTE (maybe_vcat [p1, p2, p3])
1476 entry_lbl = CLbl slow_lbl CodePtrRep
1477 slow_lbl = case (nonemptyAbsC slow) of
1478 Nothing -> mkErrorStdEntryLabel
1479 Just _ -> entryLabelFromCI cl_info
1481 ppr_decls_AbsC (CSRT lbl closure_lbls)
1482 = mapTE labelSeenTE closure_lbls `thenTE` \ seen ->
1484 if and seen then Nothing
1485 else Just (vcat [ pprExternDecl True{-in SRT decl-} l
1486 | (l,False) <- zip closure_lbls seen ]))
1488 ppr_decls_AbsC (CRetDirect _ code _ _) = ppr_decls_AbsC code
1489 ppr_decls_AbsC (CRetVector _ amodes _ _) = ppr_decls_Amodes amodes
1493 ppr_decls_Amode :: CAddrMode -> TeM (Maybe SDoc, Maybe SDoc)
1494 ppr_decls_Amode (CVal _ _) = returnTE (Nothing, Nothing)
1495 ppr_decls_Amode (CAddr _) = returnTE (Nothing, Nothing)
1496 ppr_decls_Amode (CReg _) = returnTE (Nothing, Nothing)
1497 ppr_decls_Amode (CString _) = returnTE (Nothing, Nothing)
1498 ppr_decls_Amode (CLit _) = returnTE (Nothing, Nothing)
1499 ppr_decls_Amode (CLitLit _ _) = returnTE (Nothing, Nothing)
1501 -- CIntLike must be a literal -- no decls
1502 ppr_decls_Amode (CIntLike int) = returnTE (Nothing, Nothing)
1504 -- CCharLike may have be arbitrary value -- may have decls
1505 ppr_decls_Amode (CCharLike char)
1506 = ppr_decls_Amode char
1508 -- now, the only place where we actually print temps/externs...
1509 ppr_decls_Amode (CTemp uniq kind)
1511 VoidRep -> returnTE (Nothing, Nothing)
1513 tempSeenTE uniq `thenTE` \ temp_seen ->
1515 (if temp_seen then Nothing else Just (pprTempDecl uniq kind), Nothing)
1517 ppr_decls_Amode (CLbl label VoidRep)
1518 = returnTE (Nothing, Nothing)
1520 ppr_decls_Amode (CLbl label kind)
1521 = labelSeenTE label `thenTE` \ label_seen ->
1523 if label_seen then Nothing else Just (pprExternDecl False{-not in an SRT decl-} label))
1525 ppr_decls_Amode (CTableEntry base index _)
1526 = ppr_decls_Amode base `thenTE` \ p1 ->
1527 ppr_decls_Amode index `thenTE` \ p2 ->
1528 returnTE (maybe_vcat [p1, p2])
1530 ppr_decls_Amode (CMacroExpr _ _ amodes)
1531 = ppr_decls_Amodes amodes
1533 ppr_decls_Amode other = returnTE (Nothing, Nothing)
1536 maybe_vcat :: [(Maybe SDoc, Maybe SDoc)] -> (Maybe SDoc, Maybe SDoc)
1538 = case (unzip ps) of { (ts, es) ->
1539 case (catMaybes ts) of { real_ts ->
1540 case (catMaybes es) of { real_es ->
1541 (if (null real_ts) then Nothing else Just (vcat real_ts),
1542 if (null real_es) then Nothing else Just (vcat real_es))
1547 ppr_decls_Amodes :: [CAddrMode] -> TeM (Maybe SDoc, Maybe SDoc)
1548 ppr_decls_Amodes amodes
1549 = mapTE ppr_decls_Amode amodes `thenTE` \ ps ->
1550 returnTE ( maybe_vcat ps )
1553 Print out a C Label where you want the *address* of the label, not the
1554 object it refers to. The distinction is important when the label may
1555 refer to a C structure (info tables and closures, for instance).
1557 When just generating a declaration for the label, use pprCLabel.
1560 pprCLabelAddr :: CLabel -> SDoc
1561 pprCLabelAddr clabel =
1562 case labelType clabel of
1563 InfoTblType -> addr_of_label
1564 ClosureType -> addr_of_label
1565 VecTblType -> addr_of_label
1568 addr_of_label = ptext SLIT("(P_)&") <> pp_label
1569 pp_label = pprCLabel clabel
1573 -----------------------------------------------------------------------------
1574 Initialising static objects with floating-point numbers. We can't
1575 just emit the floating point number, because C will cast it to an int
1576 by rounding it. We want the actual bit-representation of the float.
1578 This is a hack to turn the floating point numbers into ints that we
1579 can safely initialise to static locations.
1582 big_doubles = (getPrimRepSize DoubleRep) /= 1
1584 -- floatss are always 1 word
1585 floatToWord :: CAddrMode -> CAddrMode
1586 floatToWord (CLit (MachFloat r))
1588 arr <- newFloatArray ((0::Int),0)
1589 writeFloatArray arr 0 (fromRational r)
1590 i <- readIntArray arr 0
1591 return (CLit (MachInt (toInteger i) True))
1594 doubleToWords :: CAddrMode -> [CAddrMode]
1595 doubleToWords (CLit (MachDouble r))
1596 | big_doubles -- doubles are 2 words
1598 arr <- newDoubleArray ((0::Int),1)
1599 writeDoubleArray arr 0 (fromRational r)
1600 i1 <- readIntArray arr 0
1601 i2 <- readIntArray arr 1
1602 return [ CLit (MachInt (toInteger i1) True)
1603 , CLit (MachInt (toInteger i2) True)
1606 | otherwise -- doubles are 1 word
1608 arr <- newDoubleArray ((0::Int),0)
1609 writeDoubleArray arr 0 (fromRational r)
1610 i <- readIntArray arr 0
1611 return [ CLit (MachInt (toInteger i) True) ]