2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
4 %************************************************************************
6 \section[PprAbsC]{Pretty-printing Abstract~C}
8 %************************************************************************
11 #include "HsVersions.h"
17 , pprAmode -- otherwise, not exported
22 IMPORT_DELOOPER(AbsCLoop) -- break its dependence on ClosureInfo
23 IMPORT_1_3(IO(Handle))
24 IMPORT_1_3(Char(isDigit,isPrint))
25 IMPORT_1_3(GHCbase(Addr(..)) ) -- to see innards
29 import AbsCUtils ( getAmodeRep, nonemptyAbsC,
30 mixedPtrLocn, mixedTypeLocn
32 import CgCompInfo ( spARelToInt, spBRelToInt, mIN_UPD_SIZE )
33 import CLabel ( externallyVisibleCLabel, mkErrorStdEntryLabel,
34 isReadOnly, needsCDecl, pprCLabel,
35 CLabel{-instance Ord-}
37 import CmdLineOpts ( opt_SccProfilingOn )
38 import CostCentre ( uppCostCentre, uppCostCentreDecl )
39 import Costs ( costs, addrModeCosts, CostRes(..), Side(..) )
40 import CStrings ( stringToC )
41 import FiniteMap ( addToFM, emptyFM, lookupFM, FiniteMap )
42 import HeapOffs ( isZeroOff, subOff, pprHeapOffset )
43 import Literal ( showLiteral, Literal(..) )
44 import Maybes ( maybeToBool, catMaybes )
45 import PprStyle ( PprStyle(..) )
46 import Pretty ( prettyToUn )
47 import PrimOp ( primOpNeedsWrapper, pprPrimOp, PrimOp(..) )
48 import PrimRep ( isFloatingRep, showPrimRep, PrimRep(..) )
49 import SMRep ( getSMInfoStr, getSMInitHdrStr, getSMUpdInplaceHdrStr,
50 isConstantRep, isSpecRep, isPhantomRep
52 import Unique ( pprUnique, Unique{-instance NamedThing-} )
53 import UniqSet ( emptyUniqSet, elementOfUniqSet,
54 addOneToUniqSet, SYN_IE(UniqSet)
56 import Unpretty -- ********** NOTE **********
57 import Util ( nOfThem, panic, assertPanic )
62 For spitting out the costs of an abstract~C expression, @writeRealC@
63 now not only prints the C~code of the @absC@ arg but also adds a macro
64 call to a cost evaluation function @GRAN_EXEC@. For that,
65 @pprAbsC@ has a new ``costs'' argument. %% HWL
68 writeRealC :: Handle -> AbstractC -> IO ()
70 writeRealC handle absC
71 = uppPutStr handle 80 (
72 uppAbove (pprAbsC PprForC absC (costs absC)) (uppChar '\n')
75 dumpRealC :: AbstractC -> String
79 uppAbove (pprAbsC PprForC absC (costs absC)) (uppChar '\n')
83 This emits the macro, which is used in GrAnSim to compute the total costs
84 from a cost 5 tuple. %% HWL
87 emitMacro :: CostRes -> Unpretty
89 -- ToDo: Check a compile time flag to decide whether a macro should be emitted
90 emitMacro (Cost (i,b,l,s,f))
91 = uppBesides [ uppStr "GRAN_EXEC(",
92 uppInt i, uppComma, uppInt b, uppComma, uppInt l, uppComma,
93 uppInt s, uppComma, uppInt f, pp_paren_semi ]
97 pp_paren_semi = uppStr ");"
99 -- ---------------------------------------------------------------------------
100 -- New type: Now pprAbsC also takes the costs for evaluating the Abstract C
101 -- code as an argument (that's needed when spitting out the GRAN_EXEC macro
102 -- which must be done before the return i.e. inside absC code) HWL
103 -- ---------------------------------------------------------------------------
105 pprAbsC :: PprStyle -> AbstractC -> CostRes -> Unpretty
107 pprAbsC sty AbsCNop _ = uppNil
108 pprAbsC sty (AbsCStmts s1 s2) c = uppAbove (pprAbsC sty s1 c) (pprAbsC sty s2 c)
110 pprAbsC sty (CClosureUpdInfo info) c
113 pprAbsC sty (CAssign dest src) _ = pprAssign sty (getAmodeRep dest) dest src
115 pprAbsC sty (CJump target) c
116 = uppAbove (uppBesides [emitMacro c {-WDP:, uppStr "/* <--++ CJump */"-} ])
117 (uppBesides [ uppStr "JMP_(", pprAmode sty target, pp_paren_semi ])
119 pprAbsC sty (CFallThrough target) c
120 = uppAbove (uppBesides [emitMacro c {-WDP:, uppStr "/* <--++ CFallThrough */"-} ])
121 (uppBesides [ uppStr "JMP_(", pprAmode sty target, pp_paren_semi ])
123 -- --------------------------------------------------------------------------
124 -- Spit out GRAN_EXEC macro immediately before the return HWL
126 pprAbsC sty (CReturn am return_info) c
127 = uppAbove (uppBesides [emitMacro c {-WDP:, uppStr "/* <---- CReturn */"-} ])
128 (uppBesides [uppStr "JMP_(", target, pp_paren_semi ])
130 target = case return_info of
131 DirectReturn -> uppBesides [uppStr "DIRECT(", pprAmode sty am, uppRparen]
132 DynamicVectoredReturn am' -> mk_vector (pprAmode sty am')
133 StaticVectoredReturn n -> mk_vector (uppInt n) -- Always positive
134 mk_vector x = uppBesides [uppLparen, pprAmode sty am, uppStr ")[RVREL(", x, uppStr ")]"]
136 pprAbsC sty (CSplitMarker) _ = uppPStr SLIT("/* SPLIT */")
138 -- we optimise various degenerate cases of CSwitches.
140 -- --------------------------------------------------------------------------
141 -- Assume: CSwitch is also end of basic block
142 -- costs function yields nullCosts for whole switch
143 -- ==> inherited costs c are those of basic block up to switch
144 -- ==> inherit c + costs for the corresponding branch
146 -- --------------------------------------------------------------------------
148 pprAbsC sty (CSwitch discrim [] deflt) c
149 = pprAbsC sty deflt (c + costs deflt)
150 -- Empty alternative list => no costs for discrim as nothing cond. here HWL
152 pprAbsC sty (CSwitch discrim [(tag,alt_code)] deflt) c -- only one alt
153 = case (nonemptyAbsC deflt) of
154 Nothing -> -- one alt and no default
155 pprAbsC sty alt_code (c + costs alt_code)
156 -- Nothing conditional in here either HWL
158 Just dc -> -- make it an "if"
159 do_if_stmt sty discrim tag alt_code dc c
161 pprAbsC sty (CSwitch discrim [(tag1@(MachInt i1 _), alt_code1),
162 (tag2@(MachInt i2 _), alt_code2)] deflt) c
163 | empty_deflt && ((i1 == 0 && i2 == 1) || (i1 == 1 && i2 == 0))
165 do_if_stmt sty discrim tag1 alt_code1 alt_code2 c
167 do_if_stmt sty discrim tag2 alt_code2 alt_code1 c
169 empty_deflt = not (maybeToBool (nonemptyAbsC deflt))
171 pprAbsC sty (CSwitch discrim alts deflt) c -- general case
172 | isFloatingRep (getAmodeRep discrim)
173 = pprAbsC sty (foldr ( \ a -> CSwitch discrim [a]) deflt alts) c
176 uppBesides [uppStr "switch (", pp_discrim, uppStr ") {"],
177 uppNest 2 (uppAboves (map (ppr_alt sty) alts)),
178 (case (nonemptyAbsC deflt) of
181 uppNest 2 (uppAboves [uppPStr SLIT("default:"),
182 pprAbsC sty dc (c + switch_head_cost
184 uppPStr SLIT("break;")])),
188 = pprAmode sty discrim
190 ppr_alt sty (lit, absC)
191 = uppAboves [ uppBesides [uppPStr SLIT("case "), pprBasicLit sty lit, uppChar ':'],
192 uppNest 2 (uppAbove (pprAbsC sty absC (c + switch_head_cost + costs absC))
193 (uppPStr SLIT("break;"))) ]
195 -- Costs for addressing header of switch and cond. branching -- HWL
196 switch_head_cost = addrModeCosts discrim Rhs + (Cost (0, 1, 0, 0, 0))
198 pprAbsC sty stmt@(COpStmt results op@(CCallOp _ _ _ _ _) args liveness_mask vol_regs) _
199 = pprCCall sty op args results liveness_mask vol_regs
201 pprAbsC sty stmt@(COpStmt results op args liveness_mask vol_regs) _
203 non_void_args = grab_non_void_amodes args
204 non_void_results = grab_non_void_amodes results
205 -- if just one result, we print in the obvious "assignment" style;
206 -- if 0 or many results, we emit a macro call, w/ the results
207 -- followed by the arguments. The macro presumably knows which
210 the_op = ppr_op_call non_void_results non_void_args
211 -- liveness mask is *in* the non_void_args
213 case (ppr_vol_regs sty vol_regs) of { (pp_saves, pp_restores) ->
214 if primOpNeedsWrapper op then
215 uppAboves [ pp_saves,
223 ppr_op_call results args
224 = uppBesides [ prettyToUn (pprPrimOp sty op), uppLparen,
225 uppIntersperse uppComma (map ppr_op_result results),
226 if null results || null args then uppNil else uppComma,
227 uppIntersperse uppComma (map (pprAmode sty) args),
230 ppr_op_result r = ppr_amode sty r
231 -- primop macros do their own casting of result;
232 -- hence we can toss the provided cast...
234 pprAbsC sty (CSimultaneous abs_c) c
235 = uppBesides [uppStr "{{", pprAbsC sty abs_c c, uppStr "}}"]
237 pprAbsC sty stmt@(CMacroStmt macro as) _
238 = uppBesides [uppStr (show macro), uppLparen,
239 uppIntersperse uppComma (map (ppr_amode sty) as),pp_paren_semi] -- no casting
240 pprAbsC sty stmt@(CCallProfCtrMacro op as) _
241 = uppBesides [uppPStr op, uppLparen,
242 uppIntersperse uppComma (map (ppr_amode sty) as),pp_paren_semi]
243 pprAbsC sty stmt@(CCallProfCCMacro op as) _
244 = uppBesides [uppPStr op, uppLparen,
245 uppIntersperse uppComma (map (ppr_amode sty) as),pp_paren_semi]
247 pprAbsC sty (CCodeBlock label abs_C) _
248 = ASSERT( maybeToBool(nonemptyAbsC abs_C) )
249 case (pprTempAndExternDecls abs_C) of { (pp_temps, pp_exts) ->
251 uppBesides [uppStr (if (externallyVisibleCLabel label)
252 then "FN_(" -- abbreviations to save on output
254 pprCLabel sty label, uppStr ") {"],
256 PprForC -> uppAbove pp_exts pp_temps
258 uppNest 8 (uppPStr SLIT("FB_")),
259 uppNest 8 (pprAbsC sty abs_C (costs abs_C)),
260 uppNest 8 (uppPStr SLIT("FE_")),
264 pprAbsC sty (CInitHdr cl_info reg_rel cost_centre inplace_upd) _
265 = uppBesides [ pp_init_hdr, uppStr "_HDR(",
266 ppr_amode sty (CAddr reg_rel), uppComma,
267 pprCLabel sty info_lbl, uppComma,
268 if_profiling sty (pprAmode sty cost_centre), uppComma,
269 pprHeapOffset sty size, uppComma, uppInt ptr_wds, pp_paren_semi ]
271 info_lbl = infoTableLabelFromCI cl_info
272 sm_rep = closureSMRep cl_info
273 size = closureSizeWithoutFixedHdr cl_info
274 ptr_wds = closurePtrsSize cl_info
276 pp_init_hdr = uppStr (if inplace_upd then
277 getSMUpdInplaceHdrStr sm_rep
279 getSMInitHdrStr sm_rep)
281 pprAbsC sty stmt@(CStaticClosure closure_lbl cl_info cost_centre amodes) _
282 = case (pprTempAndExternDecls stmt) of { (_, pp_exts) ->
288 uppStr "SET_STATIC_HDR(",
289 pprCLabel sty closure_lbl, uppComma,
290 pprCLabel sty info_lbl, uppComma,
291 if_profiling sty (pprAmode sty cost_centre), uppComma,
292 ppLocalness closure_lbl, uppComma,
293 ppLocalnessMacro False{-for data-} info_lbl,
296 uppNest 2 (uppBesides (map (ppr_item sty) amodes)),
297 uppNest 2 (uppBesides (map (ppr_item sty) padding_wds)),
301 info_lbl = infoTableLabelFromCI cl_info
304 = if getAmodeRep item == VoidRep
305 then uppStr ", (W_) 0" -- might not even need this...
306 else uppBeside (uppStr ", (W_)") (ppr_amode sty item)
309 if not (closureUpdReqd cl_info) then
312 case (max 0 (mIN_UPD_SIZE - length amodes)) of { still_needed ->
313 nOfThem still_needed (mkIntCLit 0) } -- a bunch of 0s
316 STATIC_INIT_HDR(c,i,localness) blows into:
317 localness W_ c_closure [] = { i_info, extra_fixed_wd<1..n>
319 then *NO VarHdr STUFF FOR STATIC*...
321 then the amodes are dropped in...
327 pprAbsC sty stmt@(CClosureInfoAndCode cl_info slow maybe_fast upd cl_descr liveness) _
332 pprCLabel sty info_lbl, uppComma,
334 -- CONST_ITBL needs an extra label for
335 -- the static version of the object.
336 if isConstantRep sm_rep
337 then uppBeside (pprCLabel sty (closureLabelFromCI cl_info)) uppComma
340 pprCLabel sty slow_lbl, uppComma,
341 pprAmode sty upd, uppComma,
342 uppInt liveness, uppComma,
346 pp_ptr_wds, uppComma,
348 ppLocalness info_lbl, uppComma,
349 ppLocalnessMacro True{-function-} slow_lbl, uppComma,
352 then uppBeside (uppInt select_word_i) uppComma
355 if_profiling sty pp_kind, uppComma,
356 if_profiling sty pp_descr, uppComma,
357 if_profiling sty pp_type,
363 Just fast -> let stuff = CCodeBlock fast_lbl fast in
364 pprAbsC sty stuff (costs stuff)
367 info_lbl = infoTableLabelFromCI cl_info
368 fast_lbl = fastLabelFromCI cl_info
369 sm_rep = closureSMRep cl_info
372 = case (nonemptyAbsC slow) of
373 Nothing -> (mkErrorStdEntryLabel, uppNil)
374 Just xx -> (entryLabelFromCI cl_info,
375 let stuff = CCodeBlock slow_lbl xx in
376 pprAbsC sty stuff (costs stuff))
378 maybe_selector = maybeSelectorInfo cl_info
379 is_selector = maybeToBool maybe_selector
380 (Just (_, select_word_i)) = maybe_selector
382 pp_info_rep -- special stuff if it's a selector; otherwise, just the SMrep
383 = uppStr (if is_selector then "SELECT" else (getSMInfoStr sm_rep))
385 pp_tag = uppInt (closureSemiTag cl_info)
387 is_phantom = isPhantomRep sm_rep
389 pp_size = if isSpecRep sm_rep then -- exploiting: SPEC_VHS == 0 (always)
390 uppInt (closureNonHdrSize cl_info)
392 else if is_phantom then -- do not have sizes for these
395 pprHeapOffset sty (closureSizeWithoutFixedHdr cl_info)
397 pp_ptr_wds = if is_phantom then
400 uppInt (closurePtrsSize cl_info)
402 pp_kind = uppStr (closureKind cl_info)
403 pp_descr = uppBesides [uppChar '"', uppStr (stringToC cl_descr), uppChar '"']
404 pp_type = uppBesides [uppChar '"', uppStr (stringToC (closureTypeDescr cl_info)), uppChar '"']
406 pprAbsC sty (CRetVector lbl maybes deflt) c
407 = uppAboves [ uppStr "{ // CRetVector (lbl????)",
408 uppNest 8 (uppSep (map (ppr_maybe_amode sty) maybes)),
409 uppStr "} /*default=*/ {", pprAbsC sty deflt c,
412 ppr_maybe_amode sty Nothing = uppPStr SLIT("/*default*/")
413 ppr_maybe_amode sty (Just a) = pprAmode sty a
415 pprAbsC sty stmt@(CRetUnVector label amode) _
416 = uppBesides [uppStr "UNVECTBL(", pp_static, uppComma, pprCLabel sty label, uppComma,
417 pprAmode sty amode, uppRparen]
419 pp_static = if externallyVisibleCLabel label then uppNil else uppPStr SLIT("static")
421 pprAbsC sty stmt@(CFlatRetVector label amodes) _
422 = case (pprTempAndExternDecls stmt) of { (_, pp_exts) ->
427 uppBesides [ppLocalness label, uppPStr SLIT(" W_ "),
428 pprCLabel sty label, uppStr "[] = {"],
429 uppNest 2 (uppInterleave uppComma (map (ppr_item sty) amodes)),
432 ppr_item sty item = uppBeside (uppStr "(W_) ") (ppr_amode sty item)
434 pprAbsC sty (CCostCentreDecl is_local cc) _ = uppCostCentreDecl sty is_local cc
439 = uppBeside static const
441 static = if (externallyVisibleCLabel label) then uppNil else uppPStr SLIT("static ")
442 const = if not (isReadOnly label) then uppNil else uppPStr SLIT("const")
444 ppLocalnessMacro for_fun{-vs data-} clabel
445 = case (if externallyVisibleCLabel clabel then "E" else "I") of { prefix ->
446 case (if isReadOnly clabel then "RO_" else "") of { suffix ->
448 then uppStr (prefix ++ "F_")
449 else uppStr (prefix ++ "D_" ++ suffix)
454 grab_non_void_amodes amodes
455 = filter non_void amodes
458 = case (getAmodeRep amode) of
464 ppr_vol_regs :: PprStyle -> [MagicId] -> (Unpretty, Unpretty)
466 ppr_vol_regs sty [] = (uppNil, uppNil)
467 ppr_vol_regs sty (VoidReg:rs) = ppr_vol_regs sty rs
468 ppr_vol_regs sty (r:rs)
469 = let pp_reg = case r of
470 VanillaReg pk n -> pprVanillaReg n
471 _ -> pprMagicId sty r
472 (more_saves, more_restores) = ppr_vol_regs sty rs
474 (uppAbove (uppBeside (uppPStr SLIT("CALLER_SAVE_")) pp_reg) more_saves,
475 uppAbove (uppBeside (uppPStr SLIT("CALLER_RESTORE_")) pp_reg) more_restores)
477 -- pp_basic_{saves,restores}: The BaseReg, SpA, SuA, SpB, SuB, Hp and
478 -- HpLim (see StgRegs.lh) may need to be saved/restored around CCalls,
479 -- depending on the platform. (The "volatile regs" stuff handles all
480 -- other registers.) Just be *sure* BaseReg is OK before trying to do
484 uppPStr SLIT("CALLER_SAVE_Base"),
485 uppPStr SLIT("CALLER_SAVE_SpA"),
486 uppPStr SLIT("CALLER_SAVE_SuA"),
487 uppPStr SLIT("CALLER_SAVE_SpB"),
488 uppPStr SLIT("CALLER_SAVE_SuB"),
489 uppPStr SLIT("CALLER_SAVE_Ret"),
490 -- uppPStr SLIT("CALLER_SAVE_Activity"),
491 uppPStr SLIT("CALLER_SAVE_Hp"),
492 uppPStr SLIT("CALLER_SAVE_HpLim") ]
496 uppPStr SLIT("CALLER_RESTORE_Base"), -- must be first!
497 uppPStr SLIT("CALLER_RESTORE_SpA"),
498 uppPStr SLIT("CALLER_RESTORE_SuA"),
499 uppPStr SLIT("CALLER_RESTORE_SpB"),
500 uppPStr SLIT("CALLER_RESTORE_SuB"),
501 uppPStr SLIT("CALLER_RESTORE_Ret"),
502 -- uppPStr SLIT("CALLER_RESTORE_Activity"),
503 uppPStr SLIT("CALLER_RESTORE_Hp"),
504 uppPStr SLIT("CALLER_RESTORE_HpLim"),
505 uppPStr SLIT("CALLER_RESTORE_StdUpdRetVec"),
506 uppPStr SLIT("CALLER_RESTORE_StkStub") ]
510 if_profiling sty pretty
512 PprForC -> if opt_SccProfilingOn
514 else uppChar '0' -- leave it out!
516 _ -> {-print it anyway-} pretty
518 -- ---------------------------------------------------------------------------
519 -- Changes for GrAnSim:
520 -- draw costs for computation in head of if into both branches;
521 -- as no abstractC data structure is given for the head, one is constructed
522 -- guessing unknown values and fed into the costs function
523 -- ---------------------------------------------------------------------------
525 do_if_stmt sty discrim tag alt_code deflt c
527 -- This special case happens when testing the result of a comparison.
528 -- We can just avoid some redundant clutter in the output.
529 MachInt n _ | n==0 -> ppr_if_stmt sty (pprAmode sty discrim)
531 (addrModeCosts discrim Rhs) c
533 cond = uppBesides [ pprAmode sty discrim,
534 uppPStr SLIT(" == "),
535 pprAmode sty (CLit tag) ]
539 (addrModeCosts discrim Rhs) c
541 ppr_if_stmt sty pp_pred then_part else_part discrim_costs c
543 uppBesides [uppStr "if (", pp_pred, uppStr ") {"],
544 uppNest 8 (pprAbsC sty then_part (c + discrim_costs +
545 (Cost (0, 2, 0, 0, 0)) +
547 (case nonemptyAbsC else_part of Nothing -> uppNil; Just _ -> uppStr "} else {"),
548 uppNest 8 (pprAbsC sty else_part (c + discrim_costs +
549 (Cost (0, 1, 0, 0, 0)) +
552 {- Total costs = inherited costs (before if) + costs for accessing discrim
553 + costs for cond branch ( = (0, 1, 0, 0, 0) )
554 + costs for that alternative
558 Historical note: this used to be two separate cases -- one for `ccall'
559 and one for `casm'. To get round a potential limitation to only 10
560 arguments, the numbering of arguments in @process_casm@ was beefed up a
563 Some rough notes on generating code for @CCallOp@:
565 1) Evaluate all arguments and stuff them into registers. (done elsewhere)
566 2) Save any essential registers (heap, stack, etc).
568 ToDo: If stable pointers are in use, these must be saved in a place
569 where the runtime system can get at them so that the Stg world can
570 be restarted during the call.
572 3) Save any temporary registers that are currently in use.
573 4) Do the call putting result into a local variable
574 5) Restore essential registers
575 6) Restore temporaries
577 (This happens after restoration of essential registers because we
578 might need the @Base@ register to access all the others correctly.)
580 {- Doesn't apply anymore with ForeignObj, structure create via primop.
581 makeForeignObj (ForeignObj is not CReturnable)
582 7) If returning Malloc Pointer, build a closure containing the
585 Otherwise, copy local variable into result register.
587 8) If ccall (not casm), declare the function being called as extern so
588 that C knows if it returns anything other than an int.
591 { ResultType _ccall_result;
594 _ccall_result = f( args );
598 return_reg = _ccall_result;
602 Amendment to the above: if we can GC, we have to:
604 * make sure we save all our registers away where the garbage collector
606 * be sure that there are no live registers or we're in trouble.
607 (This can cause problems if you try something foolish like passing
608 an array or foreign obj to a _ccall_GC_ thing.)
609 * increment/decrement the @inCCallGC@ counter before/after the call so
610 that the runtime check that PerformGC is being used sensibly will work.
613 pprCCall sty op@(CCallOp op_str is_asm may_gc _ _) args results liveness_mask vol_regs
614 = if (may_gc && liveness_mask /= noLiveRegsMask)
615 then panic ("Live register in _casm_GC_ \"" ++ casm_str ++ "\" " ++ (uppShow 80 (uppCat pp_non_void_args)) ++ "\n")
619 declare_local_vars, -- local var for *result*
620 uppAboves local_arg_decls,
621 -- if is_asm then uppNil else declareExtern,
623 process_casm local_vars pp_non_void_args casm_str,
629 (pp_saves, pp_restores) = ppr_vol_regs sty vol_regs
630 (pp_save_context, pp_restore_context) =
632 then ( uppStr "extern StgInt inCCallGC; SaveAllStgRegs(); inCCallGC++;",
633 uppStr "inCCallGC--; RestoreAllStgRegs();")
634 else ( pp_basic_saves `uppAbove` pp_saves,
635 pp_basic_restores `uppAbove` pp_restores)
639 in ASSERT (all non_void nvas) nvas
640 -- the first argument will be the "I/O world" token (a VoidRep)
641 -- all others should be non-void
644 let nvrs = grab_non_void_amodes results
645 in ASSERT (length nvrs <= 1) nvrs
646 -- there will usually be two results: a (void) state which we
647 -- should ignore and a (possibly void) result.
649 (local_arg_decls, pp_non_void_args)
650 = unzip [ ppr_casm_arg sty a i | (a,i) <- non_void_args `zip` [1..] ]
652 pp_liveness = pprAmode sty (mkIntCLit liveness_mask)
654 (declare_local_vars, local_vars, assign_results)
655 = ppr_casm_results sty non_void_results pp_liveness
657 casm_str = if is_asm then _UNPK_ op_str else ccall_str
659 -- Remainder only used for ccall
661 ccall_str = uppShow 80
663 if null non_void_results
665 else uppPStr SLIT("%r = "),
666 uppLparen, uppPStr op_str, uppLparen,
667 uppIntersperse uppComma ccall_args,
670 num_args = length non_void_args
671 ccall_args = take num_args [ uppBeside (uppChar '%') (uppInt i) | i <- [0..] ]
674 If the argument is a heap object, we need to reach inside and pull out
675 the bit the C world wants to see. The only heap objects which can be
676 passed are @Array@s, @ByteArray@s and @ForeignObj@s.
679 ppr_casm_arg :: PprStyle -> CAddrMode -> Int -> (Unpretty, Unpretty)
680 -- (a) decl and assignment, (b) local var to be used later
682 ppr_casm_arg sty amode a_num
684 a_kind = getAmodeRep amode
685 pp_amode = pprAmode sty amode
686 pp_kind = pprPrimKind sty a_kind
688 local_var = uppBeside (uppPStr SLIT("_ccall_arg")) (uppInt a_num)
690 (arg_type, pp_amode2)
693 -- for array arguments, pass a pointer to the body of the array
694 -- (PTRS_ARR_CTS skips over all the header nonsense)
695 ArrayRep -> (pp_kind,
696 uppBesides [uppStr "PTRS_ARR_CTS(", pp_amode, uppRparen])
697 ByteArrayRep -> (pp_kind,
698 uppBesides [uppStr "BYTE_ARR_CTS(", pp_amode, uppRparen])
700 -- for ForeignObj, use FOREIGN_OBJ_DATA to fish out the contents.
701 ForeignObjRep -> (uppPStr SLIT("StgForeignObj"),
702 uppBesides [uppStr "ForeignObj_CLOSURE_DATA(", pp_amode, uppStr")"])
703 other -> (pp_kind, pp_amode)
706 = uppBesides [ arg_type, uppSP, local_var, uppEquals, pp_amode2, uppSemi ]
708 (declare_local_var, local_var)
711 For l-values, the critical questions are:
713 1) Are there any results at all?
715 We only allow zero or one results.
717 {- With the introduction of ForeignObj (MallocPtr++), no longer necess.
718 2) Is the result is a foreign obj?
720 The mallocptr must be encapsulated immediately in a heap object.
725 -> [CAddrMode] -- list of results (length <= 1)
726 -> Unpretty -- liveness mask
728 ( Unpretty, -- declaration of any local vars
729 [Unpretty], -- list of result vars (same length as results)
730 Unpretty ) -- assignment (if any) of results in local var to registers
732 ppr_casm_results sty [] liveness
733 = (uppNil, [], uppNil) -- no results
735 ppr_casm_results sty [r] liveness
737 result_reg = ppr_amode sty r
738 r_kind = getAmodeRep r
740 local_var = uppPStr SLIT("_ccall_result")
742 (result_type, assign_result)
744 {- @ForeignObj@s replaces MallocPtrs and are *not* CReturnable.
745 Instead, external references have to be turned into ForeignObjs
746 using the primop makeForeignObj#. Benefit: Multiple finalisation
747 routines can be accommodated and the below special case is not needed.
748 Price is, of course, that you have to explicitly wrap `foreign objects'
749 with makeForeignObj#.
752 (uppPStr SLIT("StgForeignObj"),
753 uppBesides [ uppStr "constructForeignObj(",
755 result_reg, uppComma,
759 (pprPrimKind sty r_kind,
760 uppBesides [ result_reg, uppEquals, local_var, uppSemi ])
762 declare_local_var = uppBesides [ result_type, uppSP, local_var, uppSemi ]
764 (declare_local_var, [local_var], assign_result)
766 ppr_casm_results sty rs liveness
767 = panic "ppr_casm_results: ccall/casm with many results"
771 Note the sneaky way _the_ result is represented by a list so that we
772 can complain if it's used twice.
774 ToDo: Any chance of giving line numbers when process-casm fails?
775 Or maybe we should do a check _much earlier_ in compiler. ADR
779 [Unpretty] -- results (length <= 1)
780 -> [Unpretty] -- arguments
781 -> String -- format string (with embedded %'s)
783 Unpretty -- code being generated
785 process_casm results args string = process results args string
787 process [] _ "" = uppNil
788 process (_:_) _ "" = error ("process_casm: non-void result not assigned while processing _casm_ \"" ++ string ++ "\"\n(Try changing result type to PrimIO ()\n")
790 process ress args ('%':cs)
793 error ("process_casm: lonely % while processing _casm_ \"" ++ string ++ "\".\n")
796 uppBeside (uppChar '%') (process ress args css)
800 [] -> error ("process_casm: no result to match %r while processing _casm_ \"" ++ string ++ "\".\nTry deleting %r or changing result type from PrimIO ()\n")
801 [r] -> uppBeside r (process [] args css)
802 _ -> panic ("process_casm: casm with many results while processing _casm_ \"" ++ string ++ "\".\n")
806 read_int :: ReadS Int
809 case (read_int other) of
811 if 0 <= num && num < length args
812 then uppBeside (uppParens (args !! num))
813 (process ress args css)
814 else error ("process_casm: no such arg #:"++(show num)++" while processing \"" ++ string ++ "\".\n")
815 _ -> error ("process_casm: not %<num> while processing _casm_ \"" ++ string ++ "\".\n")
817 process ress args (other_c:cs)
818 = uppBeside (uppChar other_c) (process ress args cs)
821 %************************************************************************
823 \subsection[a2r-assignments]{Assignments}
825 %************************************************************************
827 Printing assignments is a little tricky because of type coercion.
829 First of all, the kind of the thing being assigned can be gotten from
830 the destination addressing mode. (It should be the same as the kind
831 of the source addressing mode.) If the kind of the assignment is of
832 @VoidRep@, then don't generate any code at all.
835 pprAssign :: PprStyle -> PrimRep -> CAddrMode -> CAddrMode -> Unpretty
837 pprAssign sty VoidRep dest src = uppNil
840 Special treatment for floats and doubles, to avoid unwanted conversions.
843 pprAssign sty FloatRep dest@(CVal reg_rel _) src
844 = uppBesides [ uppStr "ASSIGN_FLT(", ppr_amode sty (CAddr reg_rel), uppComma, pprAmode sty src, pp_paren_semi ]
846 pprAssign sty DoubleRep dest@(CVal reg_rel _) src
847 = uppBesides [ uppStr "ASSIGN_DBL(", ppr_amode sty (CAddr reg_rel), uppComma, pprAmode sty src, pp_paren_semi ]
850 Lastly, the question is: will the C compiler think the types of the
851 two sides of the assignment match?
853 We assume that the types will match
854 if neither side is a @CVal@ addressing mode for any register
855 which can point into the heap or B stack.
857 Why? Because the heap and B stack are used to store miscellaneous things,
858 whereas the A stack, temporaries, registers, etc., are only used for things
862 pprAssign sty kind (CReg (VanillaReg _ dest)) (CReg (VanillaReg _ src))
863 = uppBesides [ pprVanillaReg dest, uppEquals,
864 pprVanillaReg src, uppSemi ]
866 pprAssign sty kind dest src
868 -- Add in a cast to StgWord (a.k.a. W_) iff the destination is mixed
869 = uppBesides [ ppr_amode sty dest, uppEquals,
870 uppStr "(W_)(", -- Here is the cast
871 ppr_amode sty src, pp_paren_semi ]
873 pprAssign sty kind dest src
874 | mixedPtrLocn dest && getAmodeRep src /= PtrRep
875 -- Add in a cast to StgPtr (a.k.a. P_) iff the destination is mixed
876 = uppBesides [ ppr_amode sty dest, uppEquals,
877 uppStr "(P_)(", -- Here is the cast
878 ppr_amode sty src, pp_paren_semi ]
880 pprAssign sty ByteArrayRep dest src
882 -- Add in a cast to StgPtr (a.k.a. B_) iff the source is mixed
883 = uppBesides [ ppr_amode sty dest, uppEquals,
884 uppStr "(B_)(", -- Here is the cast
885 ppr_amode sty src, pp_paren_semi ]
887 pprAssign sty kind other_dest src
888 = uppBesides [ ppr_amode sty other_dest, uppEquals,
889 pprAmode sty src, uppSemi ]
893 %************************************************************************
895 \subsection[a2r-CAddrModes]{Addressing modes}
897 %************************************************************************
899 @pprAmode@ is used to print r-values (which may need casts), whereas
900 @ppr_amode@ is used for l-values {\em and} as a help function for
904 pprAmode, ppr_amode :: PprStyle -> CAddrMode -> Unpretty
907 For reasons discussed above under assignments, @CVal@ modes need
908 to be treated carefully. First come special cases for floats and doubles,
909 similar to those in @pprAssign@:
911 (NB: @PK_FLT@ and @PK_DBL@ require the {\em address} of the value in
915 pprAmode sty (CVal reg_rel FloatRep)
916 = uppBesides [ uppStr "PK_FLT(", ppr_amode sty (CAddr reg_rel), uppRparen ]
917 pprAmode sty (CVal reg_rel DoubleRep)
918 = uppBesides [ uppStr "PK_DBL(", ppr_amode sty (CAddr reg_rel), uppRparen ]
921 Next comes the case where there is some other cast need, and the
926 | mixedTypeLocn amode
927 = uppParens (uppBesides [ pprPrimKind sty (getAmodeRep amode), uppStr ")(",
928 ppr_amode sty amode ])
929 | otherwise -- No cast needed
930 = ppr_amode sty amode
933 Now the rest of the cases for ``workhorse'' @ppr_amode@:
936 ppr_amode sty (CVal reg_rel _)
937 = case (pprRegRelative sty False{-no sign wanted-} reg_rel) of
938 (pp_reg, Nothing) -> uppBeside (uppChar '*') pp_reg
939 (pp_reg, Just offset) -> uppBesides [ pp_reg, uppBracket offset ]
941 ppr_amode sty (CAddr reg_rel)
942 = case (pprRegRelative sty True{-sign wanted-} reg_rel) of
943 (pp_reg, Nothing) -> pp_reg
944 (pp_reg, Just offset) -> uppBeside pp_reg offset
946 ppr_amode sty (CReg magic_id) = pprMagicId sty magic_id
948 ppr_amode sty (CTemp uniq kind) = prettyToUn (pprUnique uniq)
950 ppr_amode sty (CLbl label kind) = pprCLabel sty label
952 ppr_amode sty (CUnVecLbl direct vectored)
953 = uppBesides [uppStr "(StgRetAddr) UNVEC(", pprCLabel sty direct, uppComma,
954 pprCLabel sty vectored, uppRparen]
956 ppr_amode sty (CCharLike char)
957 = uppBesides [uppStr "CHARLIKE_CLOSURE(", pprAmode sty char, uppRparen ]
958 ppr_amode sty (CIntLike int)
959 = uppBesides [uppStr "INTLIKE_CLOSURE(", pprAmode sty int, uppRparen ]
961 ppr_amode sty (CString str) = uppBesides [uppChar '"', uppStr (stringToC (_UNPK_ str)), uppChar '"']
962 -- ToDo: are these *used* for anything?
964 ppr_amode sty (CLit lit) = pprBasicLit sty lit
966 ppr_amode sty (CLitLit str _) = uppPStr str
968 ppr_amode sty (COffset off) = pprHeapOffset sty off
970 ppr_amode sty (CCode abs_C)
971 = uppAboves [ uppStr "{ -- CCode", uppNest 8 (pprAbsC sty abs_C (costs abs_C)), uppChar '}' ]
973 ppr_amode sty (CLabelledCode label abs_C)
974 = uppAboves [ uppBesides [pprCLabel sty label, uppStr " = { -- CLabelledCode"],
975 uppNest 8 (pprAbsC sty abs_C (costs abs_C)), uppChar '}' ]
977 ppr_amode sty (CJoinPoint _ _)
978 = panic "ppr_amode: CJoinPoint"
980 ppr_amode sty (CTableEntry base index kind)
981 = uppBesides [uppStr "((", pprPrimKind sty kind, uppStr " *)(",
982 ppr_amode sty base, uppStr "))[(I_)(", ppr_amode sty index,
985 ppr_amode sty (CMacroExpr pk macro as)
986 = uppBesides [uppLparen, pprPrimKind sty pk, uppStr ")(", uppStr (show macro), uppLparen,
987 uppIntersperse uppComma (map (pprAmode sty) as), uppStr "))"]
989 ppr_amode sty (CCostCentre cc print_as_string)
990 = uppCostCentre sty print_as_string cc
993 %************************************************************************
995 \subsection[a2r-MagicIds]{Magic ids}
997 %************************************************************************
999 @pprRegRelative@ returns a pair of the @Unpretty@ for the register
1000 (some casting may be required), and a @Maybe Unpretty@ for the offset
1001 (zero offset gives a @Nothing@).
1004 addPlusSign :: Bool -> Unpretty -> Unpretty
1005 addPlusSign False p = p
1006 addPlusSign True p = uppBeside (uppChar '+') p
1008 pprSignedInt :: Bool -> Int -> Maybe Unpretty -- Nothing => 0
1009 pprSignedInt sign_wanted n
1010 = if n == 0 then Nothing else
1011 if n > 0 then Just (addPlusSign sign_wanted (uppInt n))
1012 else Just (uppInt n)
1014 pprRegRelative :: PprStyle
1015 -> Bool -- True <=> Print leading plus sign (if +ve)
1017 -> (Unpretty, Maybe Unpretty)
1019 pprRegRelative sty sign_wanted (SpARel spA off)
1020 = (pprMagicId sty SpA, pprSignedInt sign_wanted (spARelToInt spA off))
1022 pprRegRelative sty sign_wanted (SpBRel spB off)
1023 = (pprMagicId sty SpB, pprSignedInt sign_wanted (spBRelToInt spB off))
1025 pprRegRelative sty sign_wanted r@(HpRel hp off)
1026 = let to_print = hp `subOff` off
1027 pp_Hp = pprMagicId sty Hp
1029 if isZeroOff to_print then
1032 (pp_Hp, Just (uppBeside (uppChar '-') (pprHeapOffset sty to_print)))
1033 -- No parens needed because pprHeapOffset
1034 -- does them when necessary
1036 pprRegRelative sty sign_wanted (NodeRel off)
1037 = let pp_Node = pprMagicId sty node
1039 if isZeroOff off then
1042 (pp_Node, Just (addPlusSign sign_wanted (pprHeapOffset sty off)))
1046 @pprMagicId@ just prints the register name. @VanillaReg@ registers are
1047 represented by a discriminated union (@StgUnion@), so we use the @PrimRep@
1048 to select the union tag.
1051 pprMagicId :: PprStyle -> MagicId -> Unpretty
1053 pprMagicId sty BaseReg = uppPStr SLIT("BaseReg")
1054 pprMagicId sty StkOReg = uppPStr SLIT("StkOReg")
1055 pprMagicId sty (VanillaReg pk n)
1056 = uppBesides [ pprVanillaReg n, uppChar '.',
1058 pprMagicId sty (FloatReg n) = uppBeside (uppPStr SLIT("FltReg")) (uppInt IBOX(n))
1059 pprMagicId sty (DoubleReg n) = uppBeside (uppPStr SLIT("DblReg")) (uppInt IBOX(n))
1060 pprMagicId sty TagReg = uppPStr SLIT("TagReg")
1061 pprMagicId sty RetReg = uppPStr SLIT("RetReg")
1062 pprMagicId sty SpA = uppPStr SLIT("SpA")
1063 pprMagicId sty SuA = uppPStr SLIT("SuA")
1064 pprMagicId sty SpB = uppPStr SLIT("SpB")
1065 pprMagicId sty SuB = uppPStr SLIT("SuB")
1066 pprMagicId sty Hp = uppPStr SLIT("Hp")
1067 pprMagicId sty HpLim = uppPStr SLIT("HpLim")
1068 pprMagicId sty LivenessReg = uppPStr SLIT("LivenessReg")
1069 pprMagicId sty StdUpdRetVecReg = uppPStr SLIT("StdUpdRetVecReg")
1070 pprMagicId sty StkStubReg = uppPStr SLIT("StkStubReg")
1071 pprMagicId sty CurCostCentre = uppPStr SLIT("CCC")
1072 pprMagicId sty VoidReg = panic "pprMagicId:VoidReg!"
1074 pprVanillaReg :: FAST_INT -> Unpretty
1076 pprVanillaReg n = uppBeside (uppChar 'R') (uppInt IBOX(n))
1078 pprUnionTag :: PrimRep -> Unpretty
1080 pprUnionTag PtrRep = uppChar 'p'
1081 pprUnionTag CodePtrRep = uppPStr SLIT("fp")
1082 pprUnionTag DataPtrRep = uppChar 'd'
1083 pprUnionTag RetRep = uppChar 'r'
1084 pprUnionTag CostCentreRep = panic "pprUnionTag:CostCentre?"
1086 pprUnionTag CharRep = uppChar 'c'
1087 pprUnionTag IntRep = uppChar 'i'
1088 pprUnionTag WordRep = uppChar 'w'
1089 pprUnionTag AddrRep = uppChar 'v'
1090 pprUnionTag FloatRep = uppChar 'f'
1091 pprUnionTag DoubleRep = panic "pprUnionTag:Double?"
1093 pprUnionTag StablePtrRep = uppChar 'i'
1094 pprUnionTag ForeignObjRep = uppChar 'p'
1096 pprUnionTag ArrayRep = uppChar 'p'
1097 pprUnionTag ByteArrayRep = uppChar 'b'
1099 pprUnionTag _ = panic "pprUnionTag:Odd kind"
1103 Find and print local and external declarations for a list of
1104 Abstract~C statements.
1106 pprTempAndExternDecls :: AbstractC -> (Unpretty{-temps-}, Unpretty{-externs-})
1107 pprTempAndExternDecls AbsCNop = (uppNil, uppNil)
1109 pprTempAndExternDecls (AbsCStmts stmt1 stmt2)
1110 = initTE (ppr_decls_AbsC stmt1 `thenTE` \ (t_p1, e_p1) ->
1111 ppr_decls_AbsC stmt2 `thenTE` \ (t_p2, e_p2) ->
1112 case (catMaybes [t_p1, t_p2]) of { real_temps ->
1113 case (catMaybes [e_p1, e_p2]) of { real_exts ->
1114 returnTE (uppAboves real_temps, uppAboves real_exts) }}
1117 pprTempAndExternDecls other_stmt
1118 = initTE (ppr_decls_AbsC other_stmt `thenTE` \ (maybe_t, maybe_e) ->
1129 pprBasicLit :: PprStyle -> Literal -> Unpretty
1130 pprPrimKind :: PprStyle -> PrimRep -> Unpretty
1132 pprBasicLit sty lit = uppStr (showLiteral sty lit)
1133 pprPrimKind sty k = uppStr (showPrimRep k)
1137 %************************************************************************
1139 \subsection[a2r-monad]{Monadery}
1141 %************************************************************************
1143 We need some monadery to keep track of temps and externs we have already
1144 printed. This info must be threaded right through the Abstract~C, so
1145 it's most convenient to hide it in this monad.
1147 WDP 95/02: Switched from \tr{([Unique], [CLabel])} to
1148 \tr{(UniqSet, CLabelSet)}. Allegedly for efficiency.
1151 type CLabelSet = FiniteMap CLabel (){-any type will do-}
1152 emptyCLabelSet = emptyFM
1153 x `elementOfCLabelSet` labs
1154 = case (lookupFM labs x) of { Just _ -> True; Nothing -> False }
1155 addToCLabelSet set x = addToFM set x ()
1157 type TEenv = (UniqSet Unique, CLabelSet)
1159 type TeM result = TEenv -> (TEenv, result)
1161 initTE :: TeM a -> a
1163 = case sa (emptyUniqSet, emptyCLabelSet) of { (_, result) ->
1166 {-# INLINE thenTE #-}
1167 {-# INLINE returnTE #-}
1169 thenTE :: TeM a -> (a -> TeM b) -> TeM b
1171 = case a u of { (u_1, result_of_a) ->
1174 mapTE :: (a -> TeM b) -> [a] -> TeM [b]
1175 mapTE f [] = returnTE []
1177 = f x `thenTE` \ r ->
1178 mapTE f xs `thenTE` \ rs ->
1181 returnTE :: a -> TeM a
1182 returnTE result env = (env, result)
1184 -- these next two check whether the thing is already
1185 -- recorded, and THEN THEY RECORD IT
1186 -- (subsequent calls will return False for the same uniq/label)
1188 tempSeenTE :: Unique -> TeM Bool
1189 tempSeenTE uniq env@(seen_uniqs, seen_labels)
1190 = if (uniq `elementOfUniqSet` seen_uniqs)
1192 else ((addOneToUniqSet seen_uniqs uniq,
1196 labelSeenTE :: CLabel -> TeM Bool
1197 labelSeenTE label env@(seen_uniqs, seen_labels)
1198 = if (label `elementOfCLabelSet` seen_labels)
1201 addToCLabelSet seen_labels label),
1206 pprTempDecl :: Unique -> PrimRep -> Unpretty
1207 pprTempDecl uniq kind
1208 = uppBesides [ pprPrimKind PprDebug kind, uppSP, prettyToUn (pprUnique uniq), uppSemi ]
1210 pprExternDecl :: CLabel -> PrimRep -> Unpretty
1212 pprExternDecl clabel kind
1213 = if not (needsCDecl clabel) then
1214 uppNil -- do not print anything for "known external" things (e.g., < PreludeCore)
1218 CodePtrRep -> ppLocalnessMacro True{-function-} clabel
1219 _ -> ppLocalnessMacro False{-data-} clabel
1220 ) of { pp_macro_str ->
1222 uppBesides [ pp_macro_str, uppLparen, pprCLabel PprForC clabel, pp_paren_semi ]
1227 ppr_decls_AbsC :: AbstractC -> TeM (Maybe Unpretty{-temps-}, Maybe Unpretty{-externs-})
1229 ppr_decls_AbsC AbsCNop = returnTE (Nothing, Nothing)
1231 ppr_decls_AbsC (AbsCStmts stmts_1 stmts_2)
1232 = ppr_decls_AbsC stmts_1 `thenTE` \ p1 ->
1233 ppr_decls_AbsC stmts_2 `thenTE` \ p2 ->
1234 returnTE (maybe_uppAboves [p1, p2])
1236 ppr_decls_AbsC (CClosureUpdInfo info)
1237 = ppr_decls_AbsC info
1239 ppr_decls_AbsC (CSplitMarker) = returnTE (Nothing, Nothing)
1241 ppr_decls_AbsC (CAssign dest source)
1242 = ppr_decls_Amode dest `thenTE` \ p1 ->
1243 ppr_decls_Amode source `thenTE` \ p2 ->
1244 returnTE (maybe_uppAboves [p1, p2])
1246 ppr_decls_AbsC (CJump target) = ppr_decls_Amode target
1248 ppr_decls_AbsC (CFallThrough target) = ppr_decls_Amode target
1250 ppr_decls_AbsC (CReturn target _) = ppr_decls_Amode target
1252 ppr_decls_AbsC (CSwitch discrim alts deflt)
1253 = ppr_decls_Amode discrim `thenTE` \ pdisc ->
1254 mapTE ppr_alt_stuff alts `thenTE` \ palts ->
1255 ppr_decls_AbsC deflt `thenTE` \ pdeflt ->
1256 returnTE (maybe_uppAboves (pdisc:pdeflt:palts))
1258 ppr_alt_stuff (_, absC) = ppr_decls_AbsC absC
1260 ppr_decls_AbsC (CCodeBlock label absC)
1261 = ppr_decls_AbsC absC
1263 ppr_decls_AbsC (CInitHdr cl_info reg_rel cost_centre inplace_upd)
1264 -- ToDo: strictly speaking, should chk "cost_centre" amode
1265 = labelSeenTE info_lbl `thenTE` \ label_seen ->
1270 Just (pprExternDecl info_lbl PtrRep))
1272 info_lbl = infoTableLabelFromCI cl_info
1274 ppr_decls_AbsC (COpStmt results _ args _ _) = ppr_decls_Amodes (results ++ args)
1275 ppr_decls_AbsC (CSimultaneous abc) = ppr_decls_AbsC abc
1277 ppr_decls_AbsC (CMacroStmt _ amodes) = ppr_decls_Amodes amodes
1279 ppr_decls_AbsC (CCallProfCtrMacro _ amodes) = ppr_decls_Amodes [] -- *****!!!
1280 -- you get some nasty re-decls of stdio.h if you compile
1281 -- the prelude while looking inside those amodes;
1282 -- no real reason to, anyway.
1283 ppr_decls_AbsC (CCallProfCCMacro _ amodes) = ppr_decls_Amodes amodes
1285 ppr_decls_AbsC (CStaticClosure closure_lbl closure_info cost_centre amodes)
1286 -- ToDo: strictly speaking, should chk "cost_centre" amode
1287 = ppr_decls_Amodes amodes
1289 ppr_decls_AbsC (CClosureInfoAndCode cl_info slow maybe_fast upd_lbl _ _)
1290 = ppr_decls_Amodes [entry_lbl, upd_lbl] `thenTE` \ p1 ->
1291 ppr_decls_AbsC slow `thenTE` \ p2 ->
1293 Nothing -> returnTE (Nothing, Nothing)
1294 Just fast -> ppr_decls_AbsC fast) `thenTE` \ p3 ->
1295 returnTE (maybe_uppAboves [p1, p2, p3])
1297 entry_lbl = CLbl slow_lbl CodePtrRep
1298 slow_lbl = case (nonemptyAbsC slow) of
1299 Nothing -> mkErrorStdEntryLabel
1300 Just _ -> entryLabelFromCI cl_info
1302 ppr_decls_AbsC (CRetVector label maybe_amodes absC)
1303 = ppr_decls_Amodes (catMaybes maybe_amodes) `thenTE` \ p1 ->
1304 ppr_decls_AbsC absC `thenTE` \ p2 ->
1305 returnTE (maybe_uppAboves [p1, p2])
1307 ppr_decls_AbsC (CRetUnVector _ amode) = ppr_decls_Amode amode
1308 ppr_decls_AbsC (CFlatRetVector _ amodes) = ppr_decls_Amodes amodes
1312 ppr_decls_Amode :: CAddrMode -> TeM (Maybe Unpretty, Maybe Unpretty)
1313 ppr_decls_Amode (CVal _ _) = returnTE (Nothing, Nothing)
1314 ppr_decls_Amode (CAddr _) = returnTE (Nothing, Nothing)
1315 ppr_decls_Amode (CReg _) = returnTE (Nothing, Nothing)
1316 ppr_decls_Amode (CString _) = returnTE (Nothing, Nothing)
1317 ppr_decls_Amode (CLit _) = returnTE (Nothing, Nothing)
1318 ppr_decls_Amode (CLitLit _ _) = returnTE (Nothing, Nothing)
1319 ppr_decls_Amode (COffset _) = returnTE (Nothing, Nothing)
1321 -- CIntLike must be a literal -- no decls
1322 ppr_decls_Amode (CIntLike int) = returnTE (Nothing, Nothing)
1324 -- CCharLike may have be arbitrary value -- may have decls
1325 ppr_decls_Amode (CCharLike char)
1326 = ppr_decls_Amode char
1328 -- now, the only place where we actually print temps/externs...
1329 ppr_decls_Amode (CTemp uniq kind)
1331 VoidRep -> returnTE (Nothing, Nothing)
1333 tempSeenTE uniq `thenTE` \ temp_seen ->
1335 (if temp_seen then Nothing else Just (pprTempDecl uniq kind), Nothing)
1337 ppr_decls_Amode (CLbl label VoidRep)
1338 = returnTE (Nothing, Nothing)
1340 ppr_decls_Amode (CLbl label kind)
1341 = labelSeenTE label `thenTE` \ label_seen ->
1343 if label_seen then Nothing else Just (pprExternDecl label kind))
1346 ppr_decls_Amode (CUnVecLbl direct vectored)
1347 = labelSeenTE direct `thenTE` \ dlbl_seen ->
1348 labelSeenTE vectored `thenTE` \ vlbl_seen ->
1350 ddcl = if dlbl_seen then uppNil else pprExternDecl direct CodePtrRep
1351 vdcl = if vlbl_seen then uppNil else pprExternDecl vectored DataPtrRep
1354 if (dlbl_seen || not (needsCDecl direct)) &&
1355 (vlbl_seen || not (needsCDecl vectored)) then Nothing
1356 else Just (uppBesides [uppStr "UNVEC(", ddcl, uppComma, vdcl, uppRparen]))
1359 ppr_decls_Amode (CUnVecLbl direct vectored)
1360 = -- We don't mark either label as "seen", because
1361 -- we don't know which one will be used and which one tossed
1362 -- by the C macro...
1363 --labelSeenTE direct `thenTE` \ dlbl_seen ->
1364 --labelSeenTE vectored `thenTE` \ vlbl_seen ->
1366 ddcl = {-if dlbl_seen then uppNil else-} pprExternDecl direct CodePtrRep
1367 vdcl = {-if vlbl_seen then uppNil else-} pprExternDecl vectored DataPtrRep
1370 if ({-dlbl_seen ||-} not (needsCDecl direct)) &&
1371 ({-vlbl_seen ||-} not (needsCDecl vectored)) then Nothing
1372 else Just (uppBesides [uppStr "UNVEC(", ddcl, uppComma, vdcl, uppRparen]))
1374 ppr_decls_Amode (CTableEntry base index _)
1375 = ppr_decls_Amode base `thenTE` \ p1 ->
1376 ppr_decls_Amode index `thenTE` \ p2 ->
1377 returnTE (maybe_uppAboves [p1, p2])
1379 ppr_decls_Amode (CMacroExpr _ _ amodes)
1380 = ppr_decls_Amodes amodes
1382 ppr_decls_Amode other = returnTE (Nothing, Nothing)
1385 maybe_uppAboves :: [(Maybe Unpretty, Maybe Unpretty)] -> (Maybe Unpretty, Maybe Unpretty)
1387 = case (unzip ps) of { (ts, es) ->
1388 case (catMaybes ts) of { real_ts ->
1389 case (catMaybes es) of { real_es ->
1390 (if (null real_ts) then Nothing else Just (uppAboves real_ts),
1391 if (null real_es) then Nothing else Just (uppAboves real_es))
1396 ppr_decls_Amodes :: [CAddrMode] -> TeM (Maybe Unpretty, Maybe Unpretty)
1397 ppr_decls_Amodes amodes
1398 = mapTE ppr_decls_Amode amodes `thenTE` \ ps ->
1399 returnTE ( maybe_uppAboves ps )