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 [ptext SLIT("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 [ptext (cCheckMacroText 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 [ptext (cStmtMacroText 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 is_tdef op@(CCallOp op_str is_asm may_gc cconv) results args) _
288 = hsep [ ptext (if is_tdef then SLIT("typedef") else SLIT("extern"))
291 , parens (hsep (punctuate comma ccall_decl_ty_args))
295 In the non-casm case, to ensure that we're entering the given external
296 entry point using the correct calling convention, we have to do the following:
298 - When entering via a function pointer (the `dynamic' case) using the specified
299 calling convention, we emit a typedefn declaration attributed with the
300 calling convention to use together with the result and parameter types we're
301 assuming. Coerce the function pointer to this type and go.
303 - to enter the function at a given code label, we emit an extern declaration
304 for the label here, stating the calling convention together with result and
305 argument types we're assuming.
307 The C compiler will hopefully use this extern declaration to good effect,
308 reporting any discrepancies between our extern decl and any other that
311 Re: calling convention, notice that gcc (2.8.1 and egcs-1.0.2) will for
312 the external function `foo' use the calling convention of the first `foo'
313 prototype it encounters (nor does it complain about conflicting attribute
314 declarations). The consequence of this is that you cannot override the
315 calling convention of `foo' using an extern declaration (you'd have to use
316 a typedef), but why you would want to do such a thing in the first place
317 is totally beyond me.
319 ToDo: petition the gcc folks to add code to warn about conflicting attribute
325 | is_tdef = parens (text (callConvAttribute cconv) <+> char '*' <> ccall_fun_ty)
326 | otherwise = text (callConvAttribute cconv) <+> ccall_fun_ty
330 Right u -> ptext SLIT("_ccall_fun_ty") <> ppr u
334 case non_void_results of
335 [] -> ptext SLIT("void")
336 [amode] -> text (showPrimRep (getAmodeRep amode))
337 _ -> panic "pprAbsC{CCallTypedef}: ccall_res_ty"
340 | is_tdef = tail ccall_arg_tys
341 | otherwise = ccall_arg_tys
343 ccall_arg_tys = map (text.showPrimRep.getAmodeRep) non_void_args
345 -- the first argument will be the "I/O world" token (a VoidRep)
346 -- all others should be non-void
349 in ASSERT (all non_void nvas) nvas
351 -- there will usually be two results: a (void) state which we
352 -- should ignore and a (possibly void) result.
354 let nvrs = grab_non_void_amodes results
355 in ASSERT (length nvrs <= 1) nvrs
357 pprAbsC (CCodeBlock lbl abs_C) _
358 = if not (maybeToBool(nonemptyAbsC abs_C)) then
359 pprTrace "pprAbsC: curious empty code block for" (pprCLabel lbl) empty
361 case (pprTempAndExternDecls abs_C) of { (pp_temps, pp_exts) ->
364 hcat [text (if (externallyVisibleCLabel lbl)
365 then "FN_(" -- abbreviations to save on output
367 pprCLabel lbl, text ") {"],
371 nest 8 (ptext SLIT("FB_")),
372 nest 8 (pprAbsC abs_C (costs abs_C)),
373 nest 8 (ptext SLIT("FE_")),
379 pprAbsC (CInitHdr cl_info amode cost_centre) _
380 = hcat [ ptext SLIT("SET_HDR_"), char '(',
381 ppr_amode amode, comma,
382 pprCLabelAddr info_lbl, comma,
383 if_profiling (pprAmode cost_centre),
386 info_lbl = infoTableLabelFromCI cl_info
388 pprAbsC stmt@(CStaticClosure closure_lbl cl_info cost_centre amodes) _
389 = case (pprTempAndExternDecls stmt) of { (_, pp_exts) ->
393 ptext SLIT("SET_STATIC_HDR"), char '(',
394 pprCLabel closure_lbl, comma,
395 pprCLabel info_lbl, comma,
396 if_profiling (pprAmode cost_centre), comma,
397 ppLocalness closure_lbl, comma,
398 ppLocalnessMacro True{-include dyn-} info_lbl,
401 nest 2 (ppr_payload (amodes ++ padding_wds ++ static_link_field)),
405 info_lbl = infoTableLabelFromCI cl_info
407 ppr_payload [] = empty
408 ppr_payload ls = comma <+>
409 braces (hsep (punctuate comma (map ((text "(L_)" <>).ppr_item) ls)))
412 | rep == VoidRep = text "0" -- might not even need this...
413 | rep == FloatRep = ppr_amode (floatToWord item)
414 | rep == DoubleRep = hcat (punctuate (text ", (L_)")
415 (map ppr_amode (doubleToWords item)))
416 | otherwise = ppr_amode item
418 rep = getAmodeRep item
421 if not (closureUpdReqd cl_info) then
424 case max 0 (mIN_UPD_SIZE - length amodes) of { still_needed ->
425 nOfThem still_needed (mkIntCLit 0) } -- a bunch of 0s
428 | staticClosureNeedsLink cl_info = [mkIntCLit 0]
431 pprAbsC stmt@(CClosureInfoAndCode cl_info slow maybe_fast cl_descr) _
434 ptext SLIT("INFO_TABLE"),
435 ( if is_selector then
436 ptext SLIT("_SELECTOR")
437 else if is_constr then
438 ptext SLIT("_CONSTR")
439 else if needs_srt then
441 else empty ), char '(',
443 pprCLabel info_lbl, comma,
444 pprCLabel slow_lbl, comma,
445 pp_rest, {- ptrs,nptrs,[srt,]type,-} comma,
447 ppLocalness info_lbl, comma,
448 ppLocalnessMacro True{-include dyn-} slow_lbl, comma,
450 if_profiling pp_descr, comma,
451 if_profiling pp_type,
457 Just fast -> let stuff = CCodeBlock fast_lbl fast in
458 pprAbsC stuff (costs stuff)
461 info_lbl = infoTableLabelFromCI cl_info
462 fast_lbl = fastLabelFromCI cl_info
465 = case (nonemptyAbsC slow) of
466 Nothing -> (mkErrorStdEntryLabel, empty)
467 Just xx -> (entryLabelFromCI cl_info,
468 let stuff = CCodeBlock slow_lbl xx in
469 pprAbsC stuff (costs stuff))
471 maybe_selector = maybeSelectorInfo cl_info
472 is_selector = maybeToBool maybe_selector
473 (Just select_word_i) = maybe_selector
475 maybe_tag = closureSemiTag cl_info
476 is_constr = maybeToBool maybe_tag
477 (Just tag) = maybe_tag
479 needs_srt = infoTblNeedsSRT cl_info
480 srt = getSRTInfo cl_info
482 size = closureNonHdrSize cl_info
484 ptrs = closurePtrsSize cl_info
487 pp_rest | is_selector = int select_word_i
492 hcat [ int tag, comma ]
493 else if needs_srt then
498 type_str = pprSMRep (closureSMRep cl_info)
500 pp_descr = hcat [char '"', text (stringToC cl_descr), char '"']
501 pp_type = hcat [char '"', text (stringToC (closureTypeDescr cl_info)), char '"']
503 pprAbsC stmt@(CClosureTbl tycon) _
505 ptext SLIT("CLOSURE_TBL") <>
506 lparen <> pprCLabel (mkClosureTblLabel tycon) <> rparen :
508 map (pp_closure_lbl . mkStaticClosureLabel . getName) (tyConDataCons tycon)
510 ) $$ ptext SLIT("};")
512 pprAbsC stmt@(CRetDirect uniq code srt liveness) _
515 ptext SLIT("INFO_TABLE_SRT_BITMAP"), lparen,
516 pprCLabel info_lbl, comma,
517 pprCLabel entry_lbl, comma,
518 pp_liveness liveness, comma, -- bitmap
519 pp_srt_info srt, -- SRT
520 ptext type_str, comma, -- closure type
521 ppLocalness info_lbl, comma, -- info table storage class
522 ppLocalnessMacro True{-include dyn-} entry_lbl, comma, -- entry pt storage class
529 info_lbl = mkReturnInfoLabel uniq
530 entry_lbl = mkReturnPtLabel uniq
532 pp_code = let stuff = CCodeBlock entry_lbl code in
533 pprAbsC stuff (costs stuff)
535 type_str = case liveness of
536 LvSmall _ -> SLIT("RET_SMALL")
537 LvLarge _ -> SLIT("RET_BIG")
539 pprAbsC stmt@(CRetVector lbl amodes srt liveness) _
540 = case (pprTempAndExternDecls stmt) of { (_, pp_exts) ->
544 ptext SLIT("VEC_INFO_") <> int size,
546 pprCLabel lbl, comma,
547 pp_liveness liveness, comma, -- bitmap liveness mask
548 pp_srt_info srt, -- SRT
549 ptext type_str, comma,
550 ppLocalness lbl, comma
552 nest 2 (sep (punctuate comma (map ppr_item amodes))),
558 ppr_item item = (<>) (text "(F_) ") (ppr_amode item)
561 type_str = case liveness of
562 LvSmall _ -> SLIT("RET_VEC_SMALL")
563 LvLarge _ -> SLIT("RET_VEC_BIG")
566 pprAbsC (CCostCentreDecl is_local cc) _ = pprCostCentreDecl is_local cc
567 pprAbsC (CCostCentreStackDecl ccs) _ = pprCostCentreStackDecl ccs
572 = if (externallyVisibleCLabel lbl)
574 else ptext SLIT("static ")
576 -- Horrible macros for declaring the types and locality of labels (see
579 ppLocalnessMacro include_dyn_prefix clabel =
584 ClosureType -> ptext SLIT("C_")
585 CodeType -> ptext SLIT("F_")
586 InfoTblType -> ptext SLIT("I_")
587 ClosureTblType -> ptext SLIT("CP_")
588 DataType -> ptext SLIT("D_")
591 is_visible = externallyVisibleCLabel clabel
592 label_type = labelType clabel
593 is_dynamic = labelDynamic clabel
596 | is_visible = char 'E'
597 | otherwise = char 'I'
600 | not include_dyn_prefix = empty
601 | is_dynamic = char 'D'
609 grab_non_void_amodes amodes
610 = filter non_void amodes
613 = case (getAmodeRep amode) of
619 ppr_vol_regs :: [MagicId] -> (SDoc, SDoc)
621 ppr_vol_regs [] = (empty, empty)
622 ppr_vol_regs (VoidReg:rs) = ppr_vol_regs rs
624 = let pp_reg = case r of
625 VanillaReg pk n -> pprVanillaReg n
627 (more_saves, more_restores) = ppr_vol_regs rs
629 (($$) ((<>) (ptext SLIT("CALLER_SAVE_")) pp_reg) more_saves,
630 ($$) ((<>) (ptext SLIT("CALLER_RESTORE_")) pp_reg) more_restores)
632 -- pp_basic_{saves,restores}: The BaseReg, SpA, SuA, SpB, SuB, Hp and
633 -- HpLim (see StgRegs.lh) may need to be saved/restored around CCalls,
634 -- depending on the platform. (The "volatile regs" stuff handles all
635 -- other registers.) Just be *sure* BaseReg is OK before trying to do
636 -- anything else. The correct sequence of saves&restores are
637 -- encoded by the CALLER_*_SYSTEM macros.
640 [ ptext SLIT("CALLER_SAVE_Base")
641 , ptext SLIT("CALLER_SAVE_SYSTEM")
644 pp_basic_restores = ptext SLIT("CALLER_RESTORE_SYSTEM")
648 has_srt (_, NoSRT) = False
657 (lbl, SRT off len) ->
658 hcat [ pprCLabel lbl, comma,
665 | labelDynamic lbl = text "DLL_SRT_ENTRY" <> parens (pprCLabel lbl)
666 | otherwise = char '&' <> pprCLabel lbl
671 = if opt_SccProfilingOn
673 else char '0' -- leave it out!
674 -- ---------------------------------------------------------------------------
675 -- Changes for GrAnSim:
676 -- draw costs for computation in head of if into both branches;
677 -- as no abstractC data structure is given for the head, one is constructed
678 -- guessing unknown values and fed into the costs function
679 -- ---------------------------------------------------------------------------
681 do_if_stmt discrim tag alt_code deflt c
683 -- This special case happens when testing the result of a comparison.
684 -- We can just avoid some redundant clutter in the output.
685 MachInt n _ | n==0 -> ppr_if_stmt (pprAmode discrim)
687 (addrModeCosts discrim Rhs) c
689 cond = hcat [ pprAmode discrim
692 , pprAmode (CLit tag)
694 -- to be absolutely sure that none of the
695 -- conversion rules hit, e.g.,
697 -- minInt is different to (int)minInt
699 -- in C (when minInt is a number not a constant
700 -- expression which evaluates to it.)
704 MachInt _ signed | signed -> ptext SLIT("(I_)")
709 (addrModeCosts discrim Rhs) c
711 ppr_if_stmt pp_pred then_part else_part discrim_costs c
713 hcat [text "if (", pp_pred, text ") {"],
714 nest 8 (pprAbsC then_part (c + discrim_costs +
715 (Cost (0, 2, 0, 0, 0)) +
717 (case nonemptyAbsC else_part of Nothing -> empty; Just _ -> text "} else {"),
718 nest 8 (pprAbsC else_part (c + discrim_costs +
719 (Cost (0, 1, 0, 0, 0)) +
722 {- Total costs = inherited costs (before if) + costs for accessing discrim
723 + costs for cond branch ( = (0, 1, 0, 0, 0) )
724 + costs for that alternative
728 Historical note: this used to be two separate cases -- one for `ccall'
729 and one for `casm'. To get round a potential limitation to only 10
730 arguments, the numbering of arguments in @process_casm@ was beefed up a
733 Some rough notes on generating code for @CCallOp@:
735 1) Evaluate all arguments and stuff them into registers. (done elsewhere)
736 2) Save any essential registers (heap, stack, etc).
738 ToDo: If stable pointers are in use, these must be saved in a place
739 where the runtime system can get at them so that the Stg world can
740 be restarted during the call.
742 3) Save any temporary registers that are currently in use.
743 4) Do the call, putting result into a local variable
744 5) Restore essential registers
745 6) Restore temporaries
747 (This happens after restoration of essential registers because we
748 might need the @Base@ register to access all the others correctly.)
750 Otherwise, copy local variable into result register.
752 8) If ccall (not casm), declare the function being called as extern so
753 that C knows if it returns anything other than an int.
756 { ResultType _ccall_result;
759 _ccall_result = f( args );
763 return_reg = _ccall_result;
767 Amendment to the above: if we can GC, we have to:
769 * make sure we save all our registers away where the garbage collector
771 * be sure that there are no live registers or we're in trouble.
772 (This can cause problems if you try something foolish like passing
773 an array or a foreign obj to a _ccall_GC_ thing.)
774 * increment/decrement the @inCCallGC@ counter before/after the call so
775 that the runtime check that PerformGC is being used sensibly will work.
778 pprCCall op@(CCallOp op_str is_asm may_gc cconv) args results vol_regs
781 declare_local_vars, -- local var for *result*
782 vcat local_arg_decls,
784 process_casm local_vars pp_non_void_args casm_str,
790 (pp_saves, pp_restores) = ppr_vol_regs vol_regs
791 (pp_save_context, pp_restore_context)
792 | may_gc = ( text "{ I_ id; SUSPEND_THREAD(id);"
793 , text "RESUME_THREAD(id);}"
795 | otherwise = ( pp_basic_saves $$ pp_saves,
796 pp_basic_restores $$ pp_restores)
800 in ASSERT (all non_void nvas) nvas
801 -- the first argument will be the "I/O world" token (a VoidRep)
802 -- all others should be non-void
805 let nvrs = grab_non_void_amodes results
806 in ASSERT (length nvrs <= 1) nvrs
807 -- there will usually be two results: a (void) state which we
808 -- should ignore and a (possibly void) result.
810 (local_arg_decls, pp_non_void_args)
811 = unzip [ ppr_casm_arg a i | (a,i) <- non_void_args `zip` [1..] ]
813 ccall_arg_tys = map (text.showPrimRep.getAmodeRep) non_void_args
816 case non_void_results of
817 [] -> ptext SLIT("void")
818 [amode] -> text (showPrimRep (getAmodeRep amode))
819 _ -> panic "pprCCall: ccall_res_ty"
822 ptext SLIT("_ccall_fun_ty") <>
827 (declare_local_vars, local_vars, assign_results)
828 = ppr_casm_results non_void_results
830 (Left asm_str) = op_str
836 casm_str = if is_asm then _UNPK_ asm_str else ccall_str
838 -- Remainder only used for ccall
841 | is_dynamic = parens (parens (ccall_fun_ty) <> text "%0")
842 | otherwise = ptext asm_str
846 if null non_void_results
849 lparen, fun_name, lparen,
850 hcat (punctuate comma ccall_fun_args),
855 | is_dynamic = tail ccall_args
856 | otherwise = ccall_args
858 ccall_args = zipWith (\ _ i -> char '%' <> int i) non_void_args [0..]
862 If the argument is a heap object, we need to reach inside and pull out
863 the bit the C world wants to see. The only heap objects which can be
864 passed are @Array@s and @ByteArray@s.
867 ppr_casm_arg :: CAddrMode -> Int -> (SDoc, SDoc)
868 -- (a) decl and assignment, (b) local var to be used later
870 ppr_casm_arg amode a_num
872 a_kind = getAmodeRep amode
873 pp_amode = pprAmode amode
874 pp_kind = pprPrimKind a_kind
876 local_var = (<>) (ptext SLIT("_ccall_arg")) (int a_num)
878 (arg_type, pp_amode2)
881 -- for array arguments, pass a pointer to the body of the array
882 -- (PTRS_ARR_CTS skips over all the header nonsense)
883 ArrayRep -> (pp_kind,
884 hcat [ptext SLIT("PTRS_ARR_CTS"),char '(', pp_amode, rparen])
885 ByteArrayRep -> (pp_kind,
886 hcat [ptext SLIT("BYTE_ARR_CTS"),char '(', pp_amode, rparen])
888 -- for ForeignObj, use FOREIGN_OBJ_DATA to fish out the contents.
889 ForeignObjRep -> (pp_kind,
890 hcat [ptext SLIT("ForeignObj_CLOSURE_DATA"),
891 char '(', pp_amode, char ')'])
893 other -> (pp_kind, pp_amode)
896 = hcat [ arg_type, space, local_var, equals, pp_amode2, semi ]
898 (declare_local_var, local_var)
901 For l-values, the critical questions are:
903 1) Are there any results at all?
905 We only allow zero or one results.
909 :: [CAddrMode] -- list of results (length <= 1)
911 ( SDoc, -- declaration of any local vars
912 [SDoc], -- list of result vars (same length as results)
913 SDoc ) -- assignment (if any) of results in local var to registers
916 = (empty, [], empty) -- no results
920 result_reg = ppr_amode r
921 r_kind = getAmodeRep r
923 local_var = ptext SLIT("_ccall_result")
925 (result_type, assign_result)
926 = (pprPrimKind r_kind,
927 hcat [ result_reg, equals, local_var, semi ])
929 declare_local_var = hcat [ result_type, space, local_var, semi ]
931 (declare_local_var, [local_var], assign_result)
934 = panic "ppr_casm_results: ccall/casm with many results"
938 Note the sneaky way _the_ result is represented by a list so that we
939 can complain if it's used twice.
941 ToDo: Any chance of giving line numbers when process-casm fails?
942 Or maybe we should do a check _much earlier_ in compiler. ADR
945 process_casm :: [SDoc] -- results (length <= 1)
946 -> [SDoc] -- arguments
947 -> String -- format string (with embedded %'s)
948 -> SDoc -- code being generated
950 process_casm results args string = process results args string
952 process [] _ "" = empty
953 process (_:_) _ "" = error ("process_casm: non-void result not assigned while processing _casm_ \"" ++
955 "\"\n(Try changing result type to PrimIO ()\n")
957 process ress args ('%':cs)
960 error ("process_casm: lonely % while processing _casm_ \"" ++ string ++ "\".\n")
963 char '%' <> process ress args css
967 [] -> error ("process_casm: no result to match %r while processing _casm_ \"" ++ string ++ "\".\nTry deleting %r or changing result type from PrimIO ()\n")
968 [r] -> r <> (process [] args css)
969 _ -> panic ("process_casm: casm with many results while processing _casm_ \"" ++ string ++ "\".\n")
973 read_int :: ReadS Int
976 case (read_int other) of
978 if 0 <= num && num < length args
979 then parens (args !! num) <> process ress args css
980 else error ("process_casm: no such arg #:"++(show num)++" while processing \"" ++ string ++ "\".\n")
981 _ -> error ("process_casm: not %<num> while processing _casm_ \"" ++ string ++ "\".\n")
983 process ress args (other_c:cs)
984 = char other_c <> process ress args cs
987 %************************************************************************
989 \subsection[a2r-assignments]{Assignments}
991 %************************************************************************
993 Printing assignments is a little tricky because of type coercion.
995 First of all, the kind of the thing being assigned can be gotten from
996 the destination addressing mode. (It should be the same as the kind
997 of the source addressing mode.) If the kind of the assignment is of
998 @VoidRep@, then don't generate any code at all.
1001 pprAssign :: PrimRep -> CAddrMode -> CAddrMode -> SDoc
1003 pprAssign VoidRep dest src = empty
1006 Special treatment for floats and doubles, to avoid unwanted conversions.
1009 pprAssign FloatRep dest@(CVal reg_rel _) src
1010 = hcat [ ptext SLIT("ASSIGN_FLT"),char '(', ppr_amode (CAddr reg_rel), comma, pprAmode src, pp_paren_semi ]
1012 pprAssign DoubleRep dest@(CVal reg_rel _) src
1013 = hcat [ ptext SLIT("ASSIGN_DBL"),char '(', ppr_amode (CAddr reg_rel), comma, pprAmode src, pp_paren_semi ]
1015 pprAssign Int64Rep dest@(CVal reg_rel _) src
1016 = hcat [ ptext SLIT("ASSIGN_Int64"),char '(', ppr_amode (CAddr reg_rel), comma, pprAmode src, pp_paren_semi ]
1017 pprAssign Word64Rep dest@(CVal reg_rel _) src
1018 = hcat [ ptext SLIT("ASSIGN_Word64"),char '(', ppr_amode (CAddr reg_rel), comma, pprAmode src, pp_paren_semi ]
1021 Lastly, the question is: will the C compiler think the types of the
1022 two sides of the assignment match?
1024 We assume that the types will match if neither side is a
1025 @CVal@ addressing mode for any register which can point into
1028 Why? Because the heap and stack are used to store miscellaneous
1029 things, whereas the temporaries, registers, etc., are only used for
1030 things of fixed type.
1033 pprAssign kind (CReg (VanillaReg _ dest)) (CReg (VanillaReg _ src))
1034 = hcat [ pprVanillaReg dest, equals,
1035 pprVanillaReg src, semi ]
1037 pprAssign kind dest src
1038 | mixedTypeLocn dest
1039 -- Add in a cast to StgWord (a.k.a. W_) iff the destination is mixed
1040 = hcat [ ppr_amode dest, equals,
1041 text "(W_)(", -- Here is the cast
1042 ppr_amode src, pp_paren_semi ]
1044 pprAssign kind dest src
1045 | mixedPtrLocn dest && getAmodeRep src /= PtrRep
1046 -- Add in a cast to StgPtr (a.k.a. P_) iff the destination is mixed
1047 = hcat [ ppr_amode dest, equals,
1048 text "(P_)(", -- Here is the cast
1049 ppr_amode src, pp_paren_semi ]
1051 pprAssign ByteArrayRep dest src
1053 -- Add in a cast iff the source is mixed
1054 = hcat [ ppr_amode dest, equals,
1055 text "(StgByteArray)(", -- Here is the cast
1056 ppr_amode src, pp_paren_semi ]
1058 pprAssign kind other_dest src
1059 = hcat [ ppr_amode other_dest, equals,
1060 pprAmode src, semi ]
1064 %************************************************************************
1066 \subsection[a2r-CAddrModes]{Addressing modes}
1068 %************************************************************************
1070 @pprAmode@ is used to print r-values (which may need casts), whereas
1071 @ppr_amode@ is used for l-values {\em and} as a help function for
1075 pprAmode, ppr_amode :: CAddrMode -> SDoc
1078 For reasons discussed above under assignments, @CVal@ modes need
1079 to be treated carefully. First come special cases for floats and doubles,
1080 similar to those in @pprAssign@:
1082 (NB: @PK_FLT@ and @PK_DBL@ require the {\em address} of the value in
1086 pprAmode (CVal reg_rel FloatRep)
1087 = hcat [ text "PK_FLT(", ppr_amode (CAddr reg_rel), rparen ]
1088 pprAmode (CVal reg_rel DoubleRep)
1089 = hcat [ text "PK_DBL(", ppr_amode (CAddr reg_rel), rparen ]
1090 pprAmode (CVal reg_rel Int64Rep)
1091 = hcat [ text "PK_Int64(", ppr_amode (CAddr reg_rel), rparen ]
1092 pprAmode (CVal reg_rel Word64Rep)
1093 = hcat [ text "PK_Word64(", ppr_amode (CAddr reg_rel), rparen ]
1096 Next comes the case where there is some other cast need, and the
1101 | mixedTypeLocn amode
1102 = parens (hcat [ pprPrimKind (getAmodeRep amode), ptext SLIT(")("),
1104 | otherwise -- No cast needed
1108 Now the rest of the cases for ``workhorse'' @ppr_amode@:
1111 ppr_amode (CVal reg_rel _)
1112 = case (pprRegRelative False{-no sign wanted-} reg_rel) of
1113 (pp_reg, Nothing) -> (<>) (char '*') pp_reg
1114 (pp_reg, Just offset) -> hcat [ pp_reg, brackets offset ]
1116 ppr_amode (CAddr reg_rel)
1117 = case (pprRegRelative True{-sign wanted-} reg_rel) of
1118 (pp_reg, Nothing) -> pp_reg
1119 (pp_reg, Just offset) -> (<>) pp_reg offset
1121 ppr_amode (CReg magic_id) = pprMagicId magic_id
1123 ppr_amode (CTemp uniq kind) = char '_' <> pprUnique uniq <> char '_'
1125 ppr_amode (CLbl lbl kind) = pprCLabelAddr lbl
1127 ppr_amode (CCharLike ch)
1128 = hcat [ptext SLIT("CHARLIKE_CLOSURE"), char '(', pprAmode ch, rparen ]
1129 ppr_amode (CIntLike int)
1130 = hcat [ptext SLIT("INTLIKE_CLOSURE"), char '(', pprAmode int, rparen ]
1132 ppr_amode (CLit lit) = pprBasicLit lit
1134 ppr_amode (CLitLit str _) = ptext str
1136 ppr_amode (CJoinPoint _)
1137 = panic "ppr_amode: CJoinPoint"
1139 ppr_amode (CMacroExpr pk macro as)
1140 = parens (pprPrimKind pk) <>
1141 parens (ptext (cExprMacroText macro) <>
1142 parens (hcat (punctuate comma (map pprAmode as))))
1146 cExprMacroText ENTRY_CODE = SLIT("ENTRY_CODE")
1147 cExprMacroText ARG_TAG = SLIT("ARG_TAG")
1148 cExprMacroText GET_TAG = SLIT("GET_TAG")
1149 cExprMacroText UPD_FRAME_UPDATEE = SLIT("UPD_FRAME_UPDATEE")
1151 cStmtMacroText ARGS_CHK = SLIT("ARGS_CHK")
1152 cStmtMacroText ARGS_CHK_LOAD_NODE = SLIT("ARGS_CHK_LOAD_NODE")
1153 cStmtMacroText UPD_CAF = SLIT("UPD_CAF")
1154 cStmtMacroText UPD_BH_UPDATABLE = SLIT("UPD_BH_UPDATABLE")
1155 cStmtMacroText UPD_BH_SINGLE_ENTRY = SLIT("UPD_BH_SINGLE_ENTRY")
1156 cStmtMacroText PUSH_UPD_FRAME = SLIT("PUSH_UPD_FRAME")
1157 cStmtMacroText PUSH_SEQ_FRAME = SLIT("PUSH_SEQ_FRAME")
1158 cStmtMacroText UPDATE_SU_FROM_UPD_FRAME = SLIT("UPDATE_SU_FROM_UPD_FRAME")
1159 cStmtMacroText SET_TAG = SLIT("SET_TAG")
1160 cStmtMacroText GRAN_FETCH = SLIT("GRAN_FETCH")
1161 cStmtMacroText GRAN_RESCHEDULE = SLIT("GRAN_RESCHEDULE")
1162 cStmtMacroText GRAN_FETCH_AND_RESCHEDULE= SLIT("GRAN_FETCH_AND_RESCHEDULE")
1163 cStmtMacroText THREAD_CONTEXT_SWITCH = SLIT("THREAD_CONTEXT_SWITCH")
1164 cStmtMacroText GRAN_YIELD = SLIT("GRAN_YIELD")
1166 cCheckMacroText HP_CHK_NP = SLIT("HP_CHK_NP")
1167 cCheckMacroText STK_CHK_NP = SLIT("STK_CHK_NP")
1168 cCheckMacroText HP_STK_CHK_NP = SLIT("HP_STK_CHK_NP")
1169 cCheckMacroText HP_CHK_SEQ_NP = SLIT("HP_CHK_SEQ_NP")
1170 cCheckMacroText HP_CHK = SLIT("HP_CHK")
1171 cCheckMacroText STK_CHK = SLIT("STK_CHK")
1172 cCheckMacroText HP_STK_CHK = SLIT("HP_STK_CHK")
1173 cCheckMacroText HP_CHK_NOREGS = SLIT("HP_CHK_NOREGS")
1174 cCheckMacroText HP_CHK_UNPT_R1 = SLIT("HP_CHK_UNPT_R1")
1175 cCheckMacroText HP_CHK_UNBX_R1 = SLIT("HP_CHK_UNBX_R1")
1176 cCheckMacroText HP_CHK_F1 = SLIT("HP_CHK_F1")
1177 cCheckMacroText HP_CHK_D1 = SLIT("HP_CHK_D1")
1178 cCheckMacroText HP_CHK_L1 = SLIT("HP_CHK_L1")
1179 cCheckMacroText HP_CHK_UT_ALT = SLIT("HP_CHK_UT_ALT")
1180 cCheckMacroText HP_CHK_GEN = SLIT("HP_CHK_GEN")
1183 %************************************************************************
1185 \subsection[ppr-liveness-masks]{Liveness Masks}
1187 %************************************************************************
1190 pp_liveness :: Liveness -> SDoc
1193 LvLarge lbl -> char '&' <> pprCLabel lbl
1195 | bitmap_int == (minBound :: Int) -> int (bitmap_int+1) <> text "-1"
1196 | otherwise -> int bitmap_int
1198 bitmap_int = intBS mask
1201 %************************************************************************
1203 \subsection[a2r-MagicIds]{Magic ids}
1205 %************************************************************************
1207 @pprRegRelative@ returns a pair of the @Doc@ for the register
1208 (some casting may be required), and a @Maybe Doc@ for the offset
1209 (zero offset gives a @Nothing@).
1212 addPlusSign :: Bool -> SDoc -> SDoc
1213 addPlusSign False p = p
1214 addPlusSign True p = (<>) (char '+') p
1216 pprSignedInt :: Bool -> Int -> Maybe SDoc -- Nothing => 0
1217 pprSignedInt sign_wanted n
1218 = if n == 0 then Nothing else
1219 if n > 0 then Just (addPlusSign sign_wanted (int n))
1222 pprRegRelative :: Bool -- True <=> Print leading plus sign (if +ve)
1224 -> (SDoc, Maybe SDoc)
1226 pprRegRelative sign_wanted (SpRel off)
1227 = (pprMagicId Sp, pprSignedInt sign_wanted (I# off))
1229 pprRegRelative sign_wanted r@(HpRel o)
1230 = let pp_Hp = pprMagicId Hp; off = I# o
1235 (pp_Hp, Just ((<>) (char '-') (int off)))
1237 pprRegRelative sign_wanted (NodeRel o)
1238 = let pp_Node = pprMagicId node; off = I# o
1243 (pp_Node, Just (addPlusSign sign_wanted (int off)))
1245 pprRegRelative sign_wanted (CIndex base offset kind)
1246 = ( hcat [text "((", pprPrimKind kind, text " *)(", ppr_amode base, text "))"]
1247 , Just (hcat [if sign_wanted then char '+' else empty,
1248 text "(I_)(", ppr_amode offset, ptext SLIT(")")])
1252 @pprMagicId@ just prints the register name. @VanillaReg@ registers are
1253 represented by a discriminated union (@StgUnion@), so we use the @PrimRep@
1254 to select the union tag.
1257 pprMagicId :: MagicId -> SDoc
1259 pprMagicId BaseReg = ptext SLIT("BaseReg")
1260 pprMagicId (VanillaReg pk n)
1261 = hcat [ pprVanillaReg n, char '.',
1263 pprMagicId (FloatReg n) = (<>) (ptext SLIT("F")) (int IBOX(n))
1264 pprMagicId (DoubleReg n) = (<>) (ptext SLIT("D")) (int IBOX(n))
1265 pprMagicId (LongReg _ n) = (<>) (ptext SLIT("L")) (int IBOX(n))
1266 pprMagicId Sp = ptext SLIT("Sp")
1267 pprMagicId Su = ptext SLIT("Su")
1268 pprMagicId SpLim = ptext SLIT("SpLim")
1269 pprMagicId Hp = ptext SLIT("Hp")
1270 pprMagicId HpLim = ptext SLIT("HpLim")
1271 pprMagicId CurCostCentre = ptext SLIT("CCCS")
1272 pprMagicId VoidReg = panic "pprMagicId:VoidReg!"
1274 pprVanillaReg :: FAST_INT -> SDoc
1275 pprVanillaReg n = (<>) (char 'R') (int IBOX(n))
1277 pprUnionTag :: PrimRep -> SDoc
1279 pprUnionTag PtrRep = char 'p'
1280 pprUnionTag CodePtrRep = ptext SLIT("fp")
1281 pprUnionTag DataPtrRep = char 'd'
1282 pprUnionTag RetRep = char 'p'
1283 pprUnionTag CostCentreRep = panic "pprUnionTag:CostCentre?"
1285 pprUnionTag CharRep = char 'c'
1286 pprUnionTag IntRep = char 'i'
1287 pprUnionTag WordRep = char 'w'
1288 pprUnionTag AddrRep = char 'a'
1289 pprUnionTag FloatRep = char 'f'
1290 pprUnionTag DoubleRep = panic "pprUnionTag:Double?"
1292 pprUnionTag StablePtrRep = char 'i'
1293 pprUnionTag StableNameRep = char 'p'
1294 pprUnionTag WeakPtrRep = char 'p'
1295 pprUnionTag ForeignObjRep = char 'p'
1297 pprUnionTag ThreadIdRep = char 't'
1299 pprUnionTag ArrayRep = char 'p'
1300 pprUnionTag ByteArrayRep = char 'b'
1302 pprUnionTag _ = panic "pprUnionTag:Odd kind"
1306 Find and print local and external declarations for a list of
1307 Abstract~C statements.
1309 pprTempAndExternDecls :: AbstractC -> (SDoc{-temps-}, SDoc{-externs-})
1310 pprTempAndExternDecls AbsCNop = (empty, empty)
1312 pprTempAndExternDecls (AbsCStmts stmt1 stmt2)
1313 = initTE (ppr_decls_AbsC stmt1 `thenTE` \ (t_p1, e_p1) ->
1314 ppr_decls_AbsC stmt2 `thenTE` \ (t_p2, e_p2) ->
1315 case (catMaybes [t_p1, t_p2]) of { real_temps ->
1316 case (catMaybes [e_p1, e_p2]) of { real_exts ->
1317 returnTE (vcat real_temps, vcat real_exts) }}
1320 pprTempAndExternDecls other_stmt
1321 = initTE (ppr_decls_AbsC other_stmt `thenTE` \ (maybe_t, maybe_e) ->
1332 pprBasicLit :: Literal -> SDoc
1333 pprPrimKind :: PrimRep -> SDoc
1335 pprBasicLit lit = ppr lit
1336 pprPrimKind k = ppr k
1340 %************************************************************************
1342 \subsection[a2r-monad]{Monadery}
1344 %************************************************************************
1346 We need some monadery to keep track of temps and externs we have already
1347 printed. This info must be threaded right through the Abstract~C, so
1348 it's most convenient to hide it in this monad.
1350 WDP 95/02: Switched from \tr{([Unique], [CLabel])} to
1351 \tr{(UniqSet, CLabelSet)}. Allegedly for efficiency.
1354 type CLabelSet = FiniteMap CLabel (){-any type will do-}
1355 emptyCLabelSet = emptyFM
1356 x `elementOfCLabelSet` labs
1357 = case (lookupFM labs x) of { Just _ -> True; Nothing -> False }
1359 addToCLabelSet set x = addToFM set x ()
1361 type TEenv = (UniqSet Unique, CLabelSet)
1363 type TeM result = TEenv -> (TEenv, result)
1365 initTE :: TeM a -> a
1367 = case sa (emptyUniqSet, emptyCLabelSet) of { (_, result) ->
1370 {-# INLINE thenTE #-}
1371 {-# INLINE returnTE #-}
1373 thenTE :: TeM a -> (a -> TeM b) -> TeM b
1375 = case a u of { (u_1, result_of_a) ->
1378 mapTE :: (a -> TeM b) -> [a] -> TeM [b]
1379 mapTE f [] = returnTE []
1381 = f x `thenTE` \ r ->
1382 mapTE f xs `thenTE` \ rs ->
1385 returnTE :: a -> TeM a
1386 returnTE result env = (env, result)
1388 -- these next two check whether the thing is already
1389 -- recorded, and THEN THEY RECORD IT
1390 -- (subsequent calls will return False for the same uniq/label)
1392 tempSeenTE :: Unique -> TeM Bool
1393 tempSeenTE uniq env@(seen_uniqs, seen_labels)
1394 = if (uniq `elementOfUniqSet` seen_uniqs)
1396 else ((addOneToUniqSet seen_uniqs uniq,
1400 labelSeenTE :: CLabel -> TeM Bool
1401 labelSeenTE lbl env@(seen_uniqs, seen_labels)
1402 = if (lbl `elementOfCLabelSet` seen_labels)
1405 addToCLabelSet seen_labels lbl),
1410 pprTempDecl :: Unique -> PrimRep -> SDoc
1411 pprTempDecl uniq kind
1412 = hcat [ pprPrimKind kind, space, char '_', pprUnique uniq, ptext SLIT("_;") ]
1414 pprExternDecl :: Bool -> CLabel -> SDoc
1415 pprExternDecl in_srt clabel
1416 | not (needsCDecl clabel) = empty -- do not print anything for "known external" things
1418 hcat [ ppLocalnessMacro (not in_srt) clabel,
1419 lparen, dyn_wrapper (pprCLabel clabel), pp_paren_semi ]
1422 | in_srt && labelDynamic clabel = text "DLL_IMPORT_DATA_VAR" <> parens d
1428 ppr_decls_AbsC :: AbstractC -> TeM (Maybe SDoc{-temps-}, Maybe SDoc{-externs-})
1430 ppr_decls_AbsC AbsCNop = returnTE (Nothing, Nothing)
1432 ppr_decls_AbsC (AbsCStmts stmts_1 stmts_2)
1433 = ppr_decls_AbsC stmts_1 `thenTE` \ p1 ->
1434 ppr_decls_AbsC stmts_2 `thenTE` \ p2 ->
1435 returnTE (maybe_vcat [p1, p2])
1437 ppr_decls_AbsC (CSplitMarker) = returnTE (Nothing, Nothing)
1439 ppr_decls_AbsC (CAssign dest source)
1440 = ppr_decls_Amode dest `thenTE` \ p1 ->
1441 ppr_decls_Amode source `thenTE` \ p2 ->
1442 returnTE (maybe_vcat [p1, p2])
1444 ppr_decls_AbsC (CJump target) = ppr_decls_Amode target
1446 ppr_decls_AbsC (CFallThrough target) = ppr_decls_Amode target
1448 ppr_decls_AbsC (CReturn target _) = ppr_decls_Amode target
1450 ppr_decls_AbsC (CSwitch discrim alts deflt)
1451 = ppr_decls_Amode discrim `thenTE` \ pdisc ->
1452 mapTE ppr_alt_stuff alts `thenTE` \ palts ->
1453 ppr_decls_AbsC deflt `thenTE` \ pdeflt ->
1454 returnTE (maybe_vcat (pdisc:pdeflt:palts))
1456 ppr_alt_stuff (_, absC) = ppr_decls_AbsC absC
1458 ppr_decls_AbsC (CCodeBlock lbl absC)
1459 = ppr_decls_AbsC absC
1461 ppr_decls_AbsC (CInitHdr cl_info reg_rel cost_centre)
1462 -- ToDo: strictly speaking, should chk "cost_centre" amode
1463 = labelSeenTE info_lbl `thenTE` \ label_seen ->
1468 Just (pprExternDecl False{-not in an SRT decl-} info_lbl))
1470 info_lbl = infoTableLabelFromCI cl_info
1472 ppr_decls_AbsC (COpStmt results _ args _) = ppr_decls_Amodes (results ++ args)
1473 ppr_decls_AbsC (CSimultaneous abc) = ppr_decls_AbsC abc
1475 ppr_decls_AbsC (CCheck _ amodes code) =
1476 ppr_decls_Amodes amodes `thenTE` \p1 ->
1477 ppr_decls_AbsC code `thenTE` \p2 ->
1478 returnTE (maybe_vcat [p1,p2])
1480 ppr_decls_AbsC (CMacroStmt _ amodes) = ppr_decls_Amodes amodes
1482 ppr_decls_AbsC (CCallProfCtrMacro _ amodes) = ppr_decls_Amodes [] -- *****!!!
1483 -- you get some nasty re-decls of stdio.h if you compile
1484 -- the prelude while looking inside those amodes;
1485 -- no real reason to, anyway.
1486 ppr_decls_AbsC (CCallProfCCMacro _ amodes) = ppr_decls_Amodes amodes
1488 ppr_decls_AbsC (CStaticClosure closure_lbl closure_info cost_centre amodes)
1489 -- ToDo: strictly speaking, should chk "cost_centre" amode
1490 = ppr_decls_Amodes amodes
1492 ppr_decls_AbsC (CClosureInfoAndCode cl_info slow maybe_fast _)
1493 = ppr_decls_Amodes [entry_lbl] `thenTE` \ p1 ->
1494 ppr_decls_AbsC slow `thenTE` \ p2 ->
1496 Nothing -> returnTE (Nothing, Nothing)
1497 Just fast -> ppr_decls_AbsC fast) `thenTE` \ p3 ->
1498 returnTE (maybe_vcat [p1, p2, p3])
1500 entry_lbl = CLbl slow_lbl CodePtrRep
1501 slow_lbl = case (nonemptyAbsC slow) of
1502 Nothing -> mkErrorStdEntryLabel
1503 Just _ -> entryLabelFromCI cl_info
1505 ppr_decls_AbsC (CSRT lbl closure_lbls)
1506 = mapTE labelSeenTE closure_lbls `thenTE` \ seen ->
1508 if and seen then Nothing
1509 else Just (vcat [ pprExternDecl True{-in SRT decl-} l
1510 | (l,False) <- zip closure_lbls seen ]))
1512 ppr_decls_AbsC (CRetDirect _ code _ _) = ppr_decls_AbsC code
1513 ppr_decls_AbsC (CRetVector _ amodes _ _) = ppr_decls_Amodes amodes
1517 ppr_decls_Amode :: CAddrMode -> TeM (Maybe SDoc, Maybe SDoc)
1518 ppr_decls_Amode (CVal (CIndex base offset _) _) = ppr_decls_Amodes [base,offset]
1519 ppr_decls_Amode (CAddr (CIndex base offset _)) = ppr_decls_Amodes [base,offset]
1520 ppr_decls_Amode (CVal _ _) = returnTE (Nothing, Nothing)
1521 ppr_decls_Amode (CAddr _) = returnTE (Nothing, Nothing)
1522 ppr_decls_Amode (CReg _) = returnTE (Nothing, Nothing)
1523 ppr_decls_Amode (CLit _) = returnTE (Nothing, Nothing)
1524 ppr_decls_Amode (CLitLit _ _) = returnTE (Nothing, Nothing)
1526 -- CIntLike must be a literal -- no decls
1527 ppr_decls_Amode (CIntLike int) = returnTE (Nothing, Nothing)
1529 -- CCharLike may have be arbitrary value -- may have decls
1530 ppr_decls_Amode (CCharLike char)
1531 = ppr_decls_Amode char
1533 -- now, the only place where we actually print temps/externs...
1534 ppr_decls_Amode (CTemp uniq kind)
1536 VoidRep -> returnTE (Nothing, Nothing)
1538 tempSeenTE uniq `thenTE` \ temp_seen ->
1540 (if temp_seen then Nothing else Just (pprTempDecl uniq kind), Nothing)
1542 ppr_decls_Amode (CLbl lbl VoidRep)
1543 = returnTE (Nothing, Nothing)
1545 ppr_decls_Amode (CLbl lbl kind)
1546 = labelSeenTE lbl `thenTE` \ label_seen ->
1548 if label_seen then Nothing else Just (pprExternDecl False{-not in an SRT decl-} lbl))
1550 ppr_decls_Amode (CMacroExpr _ _ amodes)
1551 = ppr_decls_Amodes amodes
1553 ppr_decls_Amode other = returnTE (Nothing, Nothing)
1556 maybe_vcat :: [(Maybe SDoc, Maybe SDoc)] -> (Maybe SDoc, Maybe SDoc)
1558 = case (unzip ps) of { (ts, es) ->
1559 case (catMaybes ts) of { real_ts ->
1560 case (catMaybes es) of { real_es ->
1561 (if (null real_ts) then Nothing else Just (vcat real_ts),
1562 if (null real_es) then Nothing else Just (vcat real_es))
1567 ppr_decls_Amodes :: [CAddrMode] -> TeM (Maybe SDoc, Maybe SDoc)
1568 ppr_decls_Amodes amodes
1569 = mapTE ppr_decls_Amode amodes `thenTE` \ ps ->
1570 returnTE ( maybe_vcat ps )
1573 Print out a C Label where you want the *address* of the label, not the
1574 object it refers to. The distinction is important when the label may
1575 refer to a C structure (info tables and closures, for instance).
1577 When just generating a declaration for the label, use pprCLabel.
1580 pprCLabelAddr :: CLabel -> SDoc
1581 pprCLabelAddr clabel =
1582 case labelType clabel of
1583 InfoTblType -> addr_of_label
1584 ClosureType -> addr_of_label
1585 VecTblType -> addr_of_label
1588 addr_of_label = ptext SLIT("(P_)&") <> pp_label
1589 pp_label = pprCLabel clabel
1593 -----------------------------------------------------------------------------
1594 Initialising static objects with floating-point numbers. We can't
1595 just emit the floating point number, because C will cast it to an int
1596 by rounding it. We want the actual bit-representation of the float.
1598 This is a hack to turn the floating point numbers into ints that we
1599 can safely initialise to static locations.
1602 big_doubles = (getPrimRepSize DoubleRep) /= 1
1604 -- floatss are always 1 word
1605 floatToWord :: CAddrMode -> CAddrMode
1606 floatToWord (CLit (MachFloat r))
1608 arr <- newFloatArray ((0::Int),0)
1609 writeFloatArray arr 0 (fromRational r)
1610 i <- readIntArray arr 0
1611 return (CLit (MachInt (toInteger i) True))
1614 doubleToWords :: CAddrMode -> [CAddrMode]
1615 doubleToWords (CLit (MachDouble r))
1616 | big_doubles -- doubles are 2 words
1618 arr <- newDoubleArray ((0::Int),1)
1619 writeDoubleArray arr 0 (fromRational r)
1620 i1 <- readIntArray arr 0
1621 i2 <- readIntArray arr 1
1622 return [ CLit (MachInt (toInteger i1) True)
1623 , CLit (MachInt (toInteger i2) True)
1626 | otherwise -- doubles are 1 word
1628 arr <- newDoubleArray ((0::Int),0)
1629 writeDoubleArray arr 0 (fromRational r)
1630 i <- readIntArray arr 0
1631 return [ CLit (MachInt (toInteger i) True) ]