2 -- The above warning supression flag is a temporary kludge.
3 -- While working on this module you are encouraged to remove it and fix
4 -- any warnings in the module. See
5 -- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
8 -----------------------------------------------------------------------------
10 -- Pretty-printing of Cmm as C, suitable for feeding gcc
12 -- (c) The University of Glasgow 2004-2006
14 -----------------------------------------------------------------------------
17 -- Print Cmm as real C, for -fvia-C
19 -- This is simpler than the old PprAbsC, because Cmm is "macro-expanded"
20 -- relative to the old AbstractC, and many oddities/decorations have
21 -- disappeared from the data type.
24 -- ToDo: save/restore volatile registers around calls.
31 #include "HsVersions.h"
58 import Control.Monad.ST
60 #if x86_64_TARGET_ARCH
61 import StaticFlags ( opt_Unregisterised )
64 #if defined(alpha_TARGET_ARCH) || defined(mips_TARGET_ARCH) || defined(mipsel_TARGET_ARCH) || defined(arm_TARGET_ARCH)
65 #define BEWARE_LOAD_STORE_ALIGNMENT
68 -- --------------------------------------------------------------------------
71 pprCs :: DynFlags -> [RawCmm] -> SDoc
73 = pprCode CStyle (vcat $ map (\c -> split_marker $$ pprC c) cmms)
76 | dopt Opt_SplitObjs dflags = ptext SLIT("__STG_SPLIT_MARKER")
79 writeCs :: DynFlags -> Handle -> [RawCmm] -> IO ()
80 writeCs dflags handle cmms
81 = printForC handle (pprCs dflags cmms)
83 -- --------------------------------------------------------------------------
84 -- Now do some real work
86 -- for fun, we could call cmmToCmm over the tops...
89 pprC :: RawCmm -> SDoc
90 pprC (Cmm tops) = vcat $ intersperse (text "") $ map pprTop tops
95 pprTop :: RawCmmTop -> SDoc
96 pprTop (CmmProc info clbl _params (ListGraph blocks)) =
98 then pprDataExterns info $$
99 pprWordArray (entryLblToInfoLbl clbl) info
103 -- the first block doesn't get a label:
104 (BasicBlock _ stmts : rest) -> vcat [
107 (if (externallyVisibleCLabel clbl)
108 then mkFN_ else mkIF_) (pprCLabel clbl) <+> lbrace,
111 nest 8 (vcat (map pprStmt stmts)) $$
112 vcat (map pprBBlock rest),
117 (temp_decls, extern_decls) = pprTempAndExternDecls blocks
120 -- Chunks of static data.
122 -- We only handle (a) arrays of word-sized things and (b) strings.
124 pprTop (CmmData _section _ds@[CmmDataLabel lbl, CmmString str]) =
126 pprLocalness lbl, ptext SLIT("char "), pprCLabel lbl,
127 ptext SLIT("[] = "), pprStringInCStyle str, semi
130 pprTop (CmmData _section _ds@[CmmDataLabel lbl, CmmUninitialised size]) =
132 pprLocalness lbl, ptext SLIT("char "), pprCLabel lbl,
133 brackets (int size), semi
136 pprTop top@(CmmData _section (CmmDataLabel lbl : lits)) =
137 pprDataExterns lits $$
138 pprWordArray lbl lits
140 -- these shouldn't appear?
141 pprTop (CmmData _ _) = panic "PprC.pprTop: can't handle this data"
143 -- --------------------------------------------------------------------------
144 -- BasicBlocks are self-contained entities: they always end in a jump.
146 -- Like nativeGen/AsmCodeGen, we could probably reorder blocks to turn
147 -- as many jumps as possible into fall throughs.
150 pprBBlock :: CmmBasicBlock -> SDoc
151 pprBBlock (BasicBlock lbl stmts) =
153 pprTrace "pprC.pprBBlock: curious empty code block for"
154 (pprBlockId lbl) empty
156 nest 4 (pprBlockId lbl <> colon) $$
157 nest 8 (vcat (map pprStmt stmts))
159 -- --------------------------------------------------------------------------
160 -- Info tables. Just arrays of words.
161 -- See codeGen/ClosureInfo, and nativeGen/PprMach
163 pprWordArray :: CLabel -> [CmmStatic] -> SDoc
165 = hcat [ pprLocalness lbl, ptext SLIT("StgWord")
166 , space, pprCLabel lbl, ptext SLIT("[] = {") ]
167 $$ nest 8 (commafy (pprStatics ds))
171 -- has to be static, if it isn't globally visible
173 pprLocalness :: CLabel -> SDoc
174 pprLocalness lbl | not $ externallyVisibleCLabel lbl = ptext SLIT("static ")
177 -- --------------------------------------------------------------------------
181 pprStmt :: CmmStmt -> SDoc
183 pprStmt stmt = case stmt of
185 CmmComment s -> (hang (ptext SLIT("/*")) 3 (ftext s)) $$ ptext SLIT("*/")
187 CmmAssign dest src -> pprAssign dest src
190 | rep == I64 && wordRep /= I64
191 -> ptext SLIT("ASSIGN_Word64") <>
192 parens (mkP_ <> pprExpr1 dest <> comma <> pprExpr src) <> semi
194 | rep == F64 && wordRep /= I64
195 -> ptext SLIT("ASSIGN_DBL") <>
196 parens (mkP_ <> pprExpr1 dest <> comma <> pprExpr src) <> semi
199 -> hsep [ pprExpr (CmmLoad dest rep), equals, pprExpr src <> semi ]
203 CmmCall (CmmCallee fn cconv) results args safety _ret ->
205 pprCall ppr_fn cconv results args safety
207 ppr_fn = parens (cCast (pprCFunType (char '*') cconv results args) fn)
211 CmmLit (CmmLabel lbl) | not (isMathFun lbl) ->
212 ptext SLIT(";EI_(") <+> pprCLabel lbl <> char ')' <> semi
213 -- we declare all called functions as data labels,
214 -- and then cast them to the right type when calling.
215 -- This is because the label might already have a
216 -- declaration as a data label in the same file,
217 -- e.g. Foreign.Marshal.Alloc declares 'free' as
218 -- both a data label and a function label.
221 -- for a dynamic call, no declaration is necessary.
223 CmmCall (CmmPrim op) results args safety _ret ->
224 pprCall ppr_fn CCallConv results args safety
226 ppr_fn = pprCallishMachOp_for_C op
228 CmmBranch ident -> pprBranch ident
229 CmmCondBranch expr ident -> pprCondBranch expr ident
230 CmmJump lbl _params -> mkJMP_(pprExpr lbl) <> semi
231 CmmSwitch arg ids -> pprSwitch arg ids
233 pprCFunType :: SDoc -> CCallConv -> CmmFormals -> CmmActuals -> SDoc
234 pprCFunType ppr_fn cconv ress args
236 parens (text (ccallConvAttribute cconv) <> ppr_fn) <>
237 parens (commafy (map arg_type args))
239 res_type [] = ptext SLIT("void")
240 res_type [CmmHinted one hint] = machRepHintCType (localRegRep one) hint
242 arg_type (CmmHinted expr hint) = machRepHintCType (cmmExprRep expr) hint
244 -- ---------------------------------------------------------------------
245 -- unconditional branches
246 pprBranch :: BlockId -> SDoc
247 pprBranch ident = ptext SLIT("goto") <+> pprBlockId ident <> semi
250 -- ---------------------------------------------------------------------
251 -- conditional branches to local labels
252 pprCondBranch :: CmmExpr -> BlockId -> SDoc
253 pprCondBranch expr ident
254 = hsep [ ptext SLIT("if") , parens(pprExpr expr) ,
255 ptext SLIT("goto") , (pprBlockId ident) <> semi ]
258 -- ---------------------------------------------------------------------
259 -- a local table branch
261 -- we find the fall-through cases
263 -- N.B. we remove Nothing's from the list of branches, as they are
264 -- 'undefined'. However, they may be defined one day, so we better
265 -- document this behaviour.
267 pprSwitch :: CmmExpr -> [ Maybe BlockId ] -> SDoc
268 pprSwitch e maybe_ids
269 = let pairs = [ (ix, ident) | (ix,Just ident) <- zip [0..] maybe_ids ]
270 pairs2 = [ (map fst as, snd (head as)) | as <- groupBy sndEq pairs ]
272 (hang (ptext SLIT("switch") <+> parens ( pprExpr e ) <+> lbrace)
273 4 (vcat ( map caseify pairs2 )))
277 sndEq (_,x) (_,y) = x == y
280 caseify (ix:ixs, ident) = vcat (map do_fallthrough ixs) $$ final_branch ix
283 hsep [ ptext SLIT("case") , pprHexVal ix wordRep <> colon ,
284 ptext SLIT("/* fall through */") ]
287 hsep [ ptext SLIT("case") , pprHexVal ix wordRep <> colon ,
288 ptext SLIT("goto") , (pprBlockId ident) <> semi ]
290 -- ---------------------------------------------------------------------
294 -- C Types: the invariant is that the C expression generated by
298 -- has a type in C which is also given by
300 -- machRepCType (cmmExprRep e)
302 -- (similar invariants apply to the rest of the pretty printer).
304 pprExpr :: CmmExpr -> SDoc
305 pprExpr e = case e of
306 CmmLit lit -> pprLit lit
308 CmmLoad e I64 | wordRep /= I64
309 -> ptext SLIT("PK_Word64") <> parens (mkP_ <> pprExpr1 e)
311 CmmLoad e F64 | wordRep /= I64
312 -> ptext SLIT("PK_DBL") <> parens (mkP_ <> pprExpr1 e)
314 CmmLoad (CmmReg r) rep
315 | isPtrReg r && rep == wordRep
316 -> char '*' <> pprAsPtrReg r
318 CmmLoad (CmmRegOff r 0) rep
319 | isPtrReg r && rep == wordRep
320 -> char '*' <> pprAsPtrReg r
322 CmmLoad (CmmRegOff r off) rep
323 | isPtrReg r && rep == wordRep && (off `rem` wORD_SIZE == 0)
324 -- ToDo: check that the offset is a word multiple?
325 -- (For tagging to work, I had to avoid unaligned loads. --ARY)
326 -> pprAsPtrReg r <> brackets (ppr (off `shiftR` wordShift))
332 CmmReg reg -> pprCastReg reg
333 CmmRegOff reg 0 -> pprCastReg reg
336 | i > 0 -> pprRegOff (char '+') i
337 | otherwise -> pprRegOff (char '-') (-i)
339 pprRegOff op i' = pprCastReg reg <> op <> int i'
341 CmmMachOp mop args -> pprMachOpApp mop args
343 pprExpr1 :: CmmExpr -> SDoc
344 pprExpr1 (CmmLit lit) = pprLit1 lit
345 pprExpr1 e@(CmmReg _reg) = pprExpr e
346 pprExpr1 other = parens (pprExpr other)
348 -- --------------------------------------------------------------------------
349 -- MachOp applications
351 pprMachOpApp :: MachOp -> [CmmExpr] -> SDoc
355 = ptext SLIT("mulIntMayOflo") <> parens (commafy (map pprExpr args))
356 where isMulMayOfloOp (MO_U_MulMayOflo _) = True
357 isMulMayOfloOp (MO_S_MulMayOflo _) = True
358 isMulMayOfloOp _ = False
360 pprMachOpApp mop args
361 | Just ty <- machOpNeedsCast mop
362 = ty <> parens (pprMachOpApp' mop args)
364 = pprMachOpApp' mop args
366 -- Comparisons in C have type 'int', but we want type W_ (this is what
367 -- resultRepOfMachOp says). The other C operations inherit their type
368 -- from their operands, so no casting is required.
369 machOpNeedsCast :: MachOp -> Maybe SDoc
371 | isComparisonMachOp mop = Just mkW_
372 | otherwise = Nothing
374 pprMachOpApp' mop args
377 [x,y] -> pprArg x <+> pprMachOp_for_C mop <+> pprArg y
380 [x] -> pprMachOp_for_C mop <> parens (pprArg x)
382 _ -> panic "PprC.pprMachOp : machop with wrong number of args"
385 pprArg e | signedOp mop = cCast (machRepSignedCType (cmmExprRep e)) e
386 | otherwise = pprExpr1 e
388 -- --------------------------------------------------------------------------
391 pprLit :: CmmLit -> SDoc
392 pprLit lit = case lit of
393 CmmInt i rep -> pprHexVal i rep
394 CmmFloat f rep -> parens (machRepCType rep) <> (rational f)
395 CmmLabel clbl -> mkW_ <> pprCLabelAddr clbl
396 CmmLabelOff clbl i -> mkW_ <> pprCLabelAddr clbl <> char '+' <> int i
397 CmmLabelDiffOff clbl1 clbl2 i
399 -- * the lit must occur in the info table clbl2
400 -- * clbl1 must be an SRT, a slow entry point or a large bitmap
401 -- The Mangler is expected to convert any reference to an SRT,
402 -- a slow entry point or a large bitmap
403 -- from an info table to an offset.
404 -> mkW_ <> pprCLabelAddr clbl1 <> char '+' <> int i
406 pprCLabelAddr lbl = char '&' <> pprCLabel lbl
408 pprLit1 :: CmmLit -> SDoc
409 pprLit1 lit@(CmmLabelOff _ _) = parens (pprLit lit)
410 pprLit1 lit@(CmmLabelDiffOff _ _ _) = parens (pprLit lit)
411 pprLit1 lit@(CmmFloat _ _) = parens (pprLit lit)
412 pprLit1 other = pprLit other
414 -- ---------------------------------------------------------------------------
417 pprStatics :: [CmmStatic] -> [SDoc]
419 pprStatics (CmmStaticLit (CmmFloat f F32) : rest)
420 -- floats are padded to a word, see #1852
421 | wORD_SIZE == 8, CmmStaticLit (CmmInt 0 I32) : rest' <- rest
422 = pprLit1 (floatToWord f) : pprStatics rest'
424 = pprLit1 (floatToWord f) : pprStatics rest
426 = pprPanic "pprStatics: float" (vcat (map (\(CmmStaticLit l) -> ppr (cmmLitRep l)) rest))
427 pprStatics (CmmStaticLit (CmmFloat f F64) : rest)
428 = map pprLit1 (doubleToWords f) ++ pprStatics rest
429 pprStatics (CmmStaticLit (CmmInt i I64) : rest)
430 | machRepByteWidth I32 == wORD_SIZE
431 #ifdef WORDS_BIGENDIAN
432 = pprStatics (CmmStaticLit (CmmInt q I32) :
433 CmmStaticLit (CmmInt r I32) : rest)
435 = pprStatics (CmmStaticLit (CmmInt r I32) :
436 CmmStaticLit (CmmInt q I32) : rest)
438 where r = i .&. 0xffffffff
440 pprStatics (CmmStaticLit (CmmInt i rep) : rest)
441 | machRepByteWidth rep /= wORD_SIZE
442 = panic "pprStatics: cannot emit a non-word-sized static literal"
443 pprStatics (CmmStaticLit lit : rest)
444 = pprLit1 lit : pprStatics rest
445 pprStatics (other : rest)
446 = pprPanic "pprWord" (pprStatic other)
448 pprStatic :: CmmStatic -> SDoc
449 pprStatic s = case s of
451 CmmStaticLit lit -> nest 4 (pprLit lit)
452 CmmAlign i -> nest 4 (ptext SLIT("/* align */") <+> int i)
453 CmmDataLabel clbl -> pprCLabel clbl <> colon
454 CmmUninitialised i -> nest 4 (mkC_ <> brackets (int i))
456 -- these should be inlined, like the old .hc
457 CmmString s' -> nest 4 (mkW_ <> parens(pprStringInCStyle s'))
460 -- ---------------------------------------------------------------------------
463 pprBlockId :: BlockId -> SDoc
464 pprBlockId b = char '_' <> ppr (getUnique b)
466 -- --------------------------------------------------------------------------
467 -- Print a MachOp in a way suitable for emitting via C.
470 pprMachOp_for_C :: MachOp -> SDoc
472 pprMachOp_for_C mop = case mop of
474 -- Integer operations
477 MO_Eq _ -> ptext SLIT("==")
478 MO_Ne _ -> ptext SLIT("!=")
481 MO_S_Quot _ -> char '/'
482 MO_S_Rem _ -> char '%'
483 MO_S_Neg _ -> char '-'
485 MO_U_Quot _ -> char '/'
486 MO_U_Rem _ -> char '%'
488 -- Signed comparisons (floating-point comparisons also use these)
489 -- & Unsigned comparisons
490 MO_S_Ge _ -> ptext SLIT(">=")
491 MO_S_Le _ -> ptext SLIT("<=")
492 MO_S_Gt _ -> char '>'
493 MO_S_Lt _ -> char '<'
495 MO_U_Ge _ -> ptext SLIT(">=")
496 MO_U_Le _ -> ptext SLIT("<=")
497 MO_U_Gt _ -> char '>'
498 MO_U_Lt _ -> char '<'
500 -- Bitwise operations. Not all of these may be supported at all
501 -- sizes, and only integral MachReps are valid.
506 MO_Shl _ -> ptext SLIT("<<")
507 MO_U_Shr _ -> ptext SLIT(">>") -- unsigned shift right
508 MO_S_Shr _ -> ptext SLIT(">>") -- signed shift right
510 -- Conversions. Some of these will be NOPs.
511 -- Floating-point conversions use the signed variant.
512 -- We won't know to generate (void*) casts here, but maybe from
516 MO_U_Conv I8 I8 -> empty
517 MO_U_Conv I16 I16 -> empty
518 MO_U_Conv I32 I32 -> empty
519 MO_U_Conv I64 I64 -> empty
520 MO_U_Conv I128 I128 -> empty
521 MO_S_Conv I8 I8 -> empty
522 MO_S_Conv I16 I16 -> empty
523 MO_S_Conv I32 I32 -> empty
524 MO_S_Conv I64 I64 -> empty
525 MO_S_Conv I128 I128 -> empty
527 MO_U_Conv _from to -> parens (machRepCType to)
528 MO_S_Conv _from to -> parens (machRepSignedCType to)
530 _ -> panic "PprC.pprMachOp_for_C: unknown machop"
532 signedOp :: MachOp -> Bool
533 signedOp (MO_S_Quot _) = True
534 signedOp (MO_S_Rem _) = True
535 signedOp (MO_S_Neg _) = True
536 signedOp (MO_S_Ge _) = True
537 signedOp (MO_S_Le _) = True
538 signedOp (MO_S_Gt _) = True
539 signedOp (MO_S_Lt _) = True
540 signedOp (MO_S_Shr _) = True
541 signedOp (MO_S_Conv _ _) = True
544 -- ---------------------------------------------------------------------
545 -- tend to be implemented by foreign calls
547 pprCallishMachOp_for_C :: CallishMachOp -> SDoc
549 pprCallishMachOp_for_C mop
551 MO_F64_Pwr -> ptext SLIT("pow")
552 MO_F64_Sin -> ptext SLIT("sin")
553 MO_F64_Cos -> ptext SLIT("cos")
554 MO_F64_Tan -> ptext SLIT("tan")
555 MO_F64_Sinh -> ptext SLIT("sinh")
556 MO_F64_Cosh -> ptext SLIT("cosh")
557 MO_F64_Tanh -> ptext SLIT("tanh")
558 MO_F64_Asin -> ptext SLIT("asin")
559 MO_F64_Acos -> ptext SLIT("acos")
560 MO_F64_Atan -> ptext SLIT("atan")
561 MO_F64_Log -> ptext SLIT("log")
562 MO_F64_Exp -> ptext SLIT("exp")
563 MO_F64_Sqrt -> ptext SLIT("sqrt")
564 MO_F32_Pwr -> ptext SLIT("powf")
565 MO_F32_Sin -> ptext SLIT("sinf")
566 MO_F32_Cos -> ptext SLIT("cosf")
567 MO_F32_Tan -> ptext SLIT("tanf")
568 MO_F32_Sinh -> ptext SLIT("sinhf")
569 MO_F32_Cosh -> ptext SLIT("coshf")
570 MO_F32_Tanh -> ptext SLIT("tanhf")
571 MO_F32_Asin -> ptext SLIT("asinf")
572 MO_F32_Acos -> ptext SLIT("acosf")
573 MO_F32_Atan -> ptext SLIT("atanf")
574 MO_F32_Log -> ptext SLIT("logf")
575 MO_F32_Exp -> ptext SLIT("expf")
576 MO_F32_Sqrt -> ptext SLIT("sqrtf")
577 MO_WriteBarrier -> ptext SLIT("write_barrier")
579 -- ---------------------------------------------------------------------
583 mkJMP_, mkFN_, mkIF_ :: SDoc -> SDoc
585 mkJMP_ i = ptext SLIT("JMP_") <> parens i
586 mkFN_ i = ptext SLIT("FN_") <> parens i -- externally visible function
587 mkIF_ i = ptext SLIT("IF_") <> parens i -- locally visible
591 mkFB_ = ptext SLIT("FB_") -- function code begin
592 mkFE_ = ptext SLIT("FE_") -- function code end
594 -- from includes/Stg.h
596 mkC_,mkW_,mkP_,mkPP_,mkI_,mkA_,mkD_,mkF_,mkB_,mkL_,mkLI_,mkLW_ :: SDoc
598 mkC_ = ptext SLIT("(C_)") -- StgChar
599 mkW_ = ptext SLIT("(W_)") -- StgWord
600 mkP_ = ptext SLIT("(P_)") -- StgWord*
601 mkPP_ = ptext SLIT("(PP_)") -- P_*
602 mkI_ = ptext SLIT("(I_)") -- StgInt
603 mkA_ = ptext SLIT("(A_)") -- StgAddr
604 mkD_ = ptext SLIT("(D_)") -- const StgWord*
605 mkF_ = ptext SLIT("(F_)") -- StgFunPtr
606 mkB_ = ptext SLIT("(B_)") -- StgByteArray
607 mkL_ = ptext SLIT("(L_)") -- StgClosurePtr
609 mkLI_ = ptext SLIT("(LI_)") -- StgInt64
610 mkLW_ = ptext SLIT("(LW_)") -- StgWord64
613 -- ---------------------------------------------------------------------
617 -- Generating assignments is what we're all about, here
619 pprAssign :: CmmReg -> CmmExpr -> SDoc
621 -- dest is a reg, rhs is a reg
622 pprAssign r1 (CmmReg r2)
623 | isPtrReg r1 && isPtrReg r2
624 = hcat [ pprAsPtrReg r1, equals, pprAsPtrReg r2, semi ]
626 -- dest is a reg, rhs is a CmmRegOff
627 pprAssign r1 (CmmRegOff r2 off)
628 | isPtrReg r1 && isPtrReg r2 && (off `rem` wORD_SIZE == 0)
629 = hcat [ pprAsPtrReg r1, equals, pprAsPtrReg r2, op, int off', semi ]
631 off1 = off `shiftR` wordShift
633 (op,off') | off >= 0 = (char '+', off1)
634 | otherwise = (char '-', -off1)
636 -- dest is a reg, rhs is anything.
637 -- We can't cast the lvalue, so we have to cast the rhs if necessary. Casting
638 -- the lvalue elicits a warning from new GCC versions (3.4+).
640 | isFixedPtrReg r1 = mkAssign (mkP_ <> pprExpr1 r2)
641 | Just ty <- strangeRegType r1 = mkAssign (parens ty <> pprExpr1 r2)
642 | otherwise = mkAssign (pprExpr r2)
643 where mkAssign x = if r1 == CmmGlobal BaseReg
644 then ptext SLIT("ASSIGN_BaseReg") <> parens x <> semi
645 else pprReg r1 <> ptext SLIT(" = ") <> x <> semi
647 -- ---------------------------------------------------------------------
651 | isStrangeTypeReg reg = mkW_ <> pprReg reg
652 | otherwise = pprReg reg
654 -- True if (pprReg reg) will give an expression with type StgPtr. We
655 -- need to take care with pointer arithmetic on registers with type
657 isFixedPtrReg :: CmmReg -> Bool
658 isFixedPtrReg (CmmLocal _) = False
659 isFixedPtrReg (CmmGlobal r) = isFixedPtrGlobalReg r
661 -- True if (pprAsPtrReg reg) will give an expression with type StgPtr
662 isPtrReg :: CmmReg -> Bool
663 isPtrReg (CmmLocal _) = False
664 isPtrReg (CmmGlobal (VanillaReg n)) = True -- if we print via pprAsPtrReg
665 isPtrReg (CmmGlobal reg) = isFixedPtrGlobalReg reg
667 -- True if this global reg has type StgPtr
668 isFixedPtrGlobalReg :: GlobalReg -> Bool
669 isFixedPtrGlobalReg Sp = True
670 isFixedPtrGlobalReg Hp = True
671 isFixedPtrGlobalReg HpLim = True
672 isFixedPtrGlobalReg SpLim = True
673 isFixedPtrGlobalReg _ = False
675 -- True if in C this register doesn't have the type given by
676 -- (machRepCType (cmmRegRep reg)), so it has to be cast.
677 isStrangeTypeReg :: CmmReg -> Bool
678 isStrangeTypeReg (CmmLocal _) = False
679 isStrangeTypeReg (CmmGlobal g) = isStrangeTypeGlobal g
681 isStrangeTypeGlobal :: GlobalReg -> Bool
682 isStrangeTypeGlobal CurrentTSO = True
683 isStrangeTypeGlobal CurrentNursery = True
684 isStrangeTypeGlobal BaseReg = True
685 isStrangeTypeGlobal r = isFixedPtrGlobalReg r
687 strangeRegType :: CmmReg -> Maybe SDoc
688 strangeRegType (CmmGlobal CurrentTSO) = Just (ptext SLIT("struct StgTSO_ *"))
689 strangeRegType (CmmGlobal CurrentNursery) = Just (ptext SLIT("struct bdescr_ *"))
690 strangeRegType (CmmGlobal BaseReg) = Just (ptext SLIT("struct StgRegTable_ *"))
691 strangeRegType _ = Nothing
693 -- pprReg just prints the register name.
695 pprReg :: CmmReg -> SDoc
697 CmmLocal local -> pprLocalReg local
698 CmmGlobal global -> pprGlobalReg global
700 pprAsPtrReg :: CmmReg -> SDoc
701 pprAsPtrReg (CmmGlobal (VanillaReg n)) = char 'R' <> int n <> ptext SLIT(".p")
702 pprAsPtrReg other_reg = pprReg other_reg
704 pprGlobalReg :: GlobalReg -> SDoc
705 pprGlobalReg gr = case gr of
706 VanillaReg n -> char 'R' <> int n <> ptext SLIT(".w")
707 FloatReg n -> char 'F' <> int n
708 DoubleReg n -> char 'D' <> int n
709 LongReg n -> char 'L' <> int n
710 Sp -> ptext SLIT("Sp")
711 SpLim -> ptext SLIT("SpLim")
712 Hp -> ptext SLIT("Hp")
713 HpLim -> ptext SLIT("HpLim")
714 CurrentTSO -> ptext SLIT("CurrentTSO")
715 CurrentNursery -> ptext SLIT("CurrentNursery")
716 HpAlloc -> ptext SLIT("HpAlloc")
717 BaseReg -> ptext SLIT("BaseReg")
718 GCEnter1 -> ptext SLIT("stg_gc_enter_1")
719 GCFun -> ptext SLIT("stg_gc_fun")
721 pprLocalReg :: LocalReg -> SDoc
722 pprLocalReg (LocalReg uniq _ _) = char '_' <> ppr uniq
724 -- -----------------------------------------------------------------------------
727 pprCall :: SDoc -> CCallConv -> CmmFormals -> CmmActuals -> CmmSafety
730 pprCall ppr_fn cconv results args _
731 | not (is_cish cconv)
732 = panic "pprCall: unknown calling convention"
736 #if x86_64_TARGET_ARCH
737 -- HACK around gcc optimisations.
738 -- x86_64 needs a __DISCARD__() here, to create a barrier between
739 -- putting the arguments into temporaries and passing the arguments
740 -- to the callee, because the argument expressions may refer to
741 -- machine registers that are also used for passing arguments in the
742 -- C calling convention.
743 (if (not opt_Unregisterised)
744 then ptext SLIT("__DISCARD__();")
747 ppr_assign results (ppr_fn <> parens (commafy (map pprArg args))) <> semi
749 ppr_assign [] rhs = rhs
750 ppr_assign [CmmHinted one hint] rhs
751 = pprLocalReg one <> ptext SLIT(" = ")
752 <> pprUnHint hint (localRegRep one) <> rhs
753 ppr_assign _other _rhs = panic "pprCall: multiple results"
755 pprArg (CmmHinted expr hint)
756 | hint `elem` [PtrHint,SignedHint]
757 = cCast (machRepHintCType (cmmExprRep expr) hint) expr
758 -- see comment by machRepHintCType below
759 pprArg (CmmHinted expr _other)
762 pprUnHint PtrHint rep = parens (machRepCType rep)
763 pprUnHint SignedHint rep = parens (machRepCType rep)
764 pprUnHint _ _ = empty
766 pprGlobalRegName :: GlobalReg -> SDoc
767 pprGlobalRegName gr = case gr of
768 VanillaReg n -> char 'R' <> int n -- without the .w suffix
771 -- Currently we only have these two calling conventions, but this might
772 -- change in the future...
773 is_cish CCallConv = True
774 is_cish StdCallConv = True
776 -- ---------------------------------------------------------------------
777 -- Find and print local and external declarations for a list of
780 pprTempAndExternDecls :: [CmmBasicBlock] -> (SDoc{-temps-}, SDoc{-externs-})
781 pprTempAndExternDecls stmts
782 = (vcat (map pprTempDecl (uniqSetToList temps)),
783 vcat (map (pprExternDecl False{-ToDo-}) (keysFM lbls)))
784 where (temps, lbls) = runTE (mapM_ te_BB stmts)
786 pprDataExterns :: [CmmStatic] -> SDoc
787 pprDataExterns statics
788 = vcat (map (pprExternDecl False{-ToDo-}) (keysFM lbls))
789 where (_, lbls) = runTE (mapM_ te_Static statics)
791 pprTempDecl :: LocalReg -> SDoc
792 pprTempDecl l@(LocalReg _ rep _)
793 = hcat [ machRepCType rep, space, pprLocalReg l, semi ]
795 pprExternDecl :: Bool -> CLabel -> SDoc
796 pprExternDecl in_srt lbl
797 -- do not print anything for "known external" things
798 | not (needsCDecl lbl) = empty
800 hcat [ visibility, label_type (labelType lbl),
801 lparen, pprCLabel lbl, text ");" ]
803 label_type CodeLabel = ptext SLIT("F_")
804 label_type DataLabel = ptext SLIT("I_")
807 | externallyVisibleCLabel lbl = char 'E'
808 | otherwise = char 'I'
811 type TEState = (UniqSet LocalReg, FiniteMap CLabel ())
812 newtype TE a = TE { unTE :: TEState -> (a, TEState) }
814 instance Monad TE where
815 TE m >>= k = TE $ \s -> case m s of (a, s') -> unTE (k a) s'
816 return a = TE $ \s -> (a, s)
818 te_lbl :: CLabel -> TE ()
819 te_lbl lbl = TE $ \(temps,lbls) -> ((), (temps, addToFM lbls lbl ()))
821 te_temp :: LocalReg -> TE ()
822 te_temp r = TE $ \(temps,lbls) -> ((), (addOneToUniqSet temps r, lbls))
824 runTE :: TE () -> TEState
825 runTE (TE m) = snd (m (emptyUniqSet, emptyFM))
827 te_Static :: CmmStatic -> TE ()
828 te_Static (CmmStaticLit lit) = te_Lit lit
829 te_Static _ = return ()
831 te_BB :: CmmBasicBlock -> TE ()
832 te_BB (BasicBlock _ ss) = mapM_ te_Stmt ss
834 te_Lit :: CmmLit -> TE ()
835 te_Lit (CmmLabel l) = te_lbl l
836 te_Lit (CmmLabelOff l _) = te_lbl l
837 te_Lit (CmmLabelDiffOff l1 l2 _) = te_lbl l1
840 te_Stmt :: CmmStmt -> TE ()
841 te_Stmt (CmmAssign r e) = te_Reg r >> te_Expr e
842 te_Stmt (CmmStore l r) = te_Expr l >> te_Expr r
843 te_Stmt (CmmCall _ rs es _ _) = mapM_ (te_temp.hintlessCmm) rs >>
844 mapM_ (te_Expr.hintlessCmm) es
845 te_Stmt (CmmCondBranch e _) = te_Expr e
846 te_Stmt (CmmSwitch e _) = te_Expr e
847 te_Stmt (CmmJump e _) = te_Expr e
848 te_Stmt _ = return ()
850 te_Expr :: CmmExpr -> TE ()
851 te_Expr (CmmLit lit) = te_Lit lit
852 te_Expr (CmmLoad e _) = te_Expr e
853 te_Expr (CmmReg r) = te_Reg r
854 te_Expr (CmmMachOp _ es) = mapM_ te_Expr es
855 te_Expr (CmmRegOff r _) = te_Reg r
857 te_Reg :: CmmReg -> TE ()
858 te_Reg (CmmLocal l) = te_temp l
862 -- ---------------------------------------------------------------------
863 -- C types for MachReps
865 cCast :: SDoc -> CmmExpr -> SDoc
866 cCast ty expr = parens ty <> pprExpr1 expr
868 cLoad :: CmmExpr -> MachRep -> SDoc
869 #ifdef BEWARE_LOAD_STORE_ALIGNMENT
871 let decl = machRepCType rep <+> ptext SLIT("x") <> semi
872 struct = ptext SLIT("struct") <+> braces (decl)
873 packed_attr = ptext SLIT("__attribute__((packed))")
874 cast = parens (struct <+> packed_attr <> char '*')
875 in parens (cast <+> pprExpr1 expr) <> ptext SLIT("->x")
877 cLoad expr rep = char '*' <> parens (cCast (machRepPtrCType rep) expr)
880 -- This is for finding the types of foreign call arguments. For a pointer
881 -- argument, we always cast the argument to (void *), to avoid warnings from
883 machRepHintCType :: MachRep -> MachHint -> SDoc
884 machRepHintCType rep PtrHint = ptext SLIT("void *")
885 machRepHintCType rep SignedHint = machRepSignedCType rep
886 machRepHintCType rep _other = machRepCType rep
888 machRepPtrCType :: MachRep -> SDoc
889 machRepPtrCType r | r == wordRep = ptext SLIT("P_")
890 | otherwise = machRepCType r <> char '*'
892 machRepCType :: MachRep -> SDoc
893 machRepCType r | r == wordRep = ptext SLIT("W_")
894 | otherwise = sized_type
895 where sized_type = case r of
896 I8 -> ptext SLIT("StgWord8")
897 I16 -> ptext SLIT("StgWord16")
898 I32 -> ptext SLIT("StgWord32")
899 I64 -> ptext SLIT("StgWord64")
900 F32 -> ptext SLIT("StgFloat") -- ToDo: correct?
901 F64 -> ptext SLIT("StgDouble")
902 _ -> panic "machRepCType"
904 machRepSignedCType :: MachRep -> SDoc
905 machRepSignedCType r | r == wordRep = ptext SLIT("I_")
906 | otherwise = sized_type
907 where sized_type = case r of
908 I8 -> ptext SLIT("StgInt8")
909 I16 -> ptext SLIT("StgInt16")
910 I32 -> ptext SLIT("StgInt32")
911 I64 -> ptext SLIT("StgInt64")
912 F32 -> ptext SLIT("StgFloat") -- ToDo: correct?
913 F64 -> ptext SLIT("StgDouble")
914 _ -> panic "machRepCType"
916 -- ---------------------------------------------------------------------
917 -- print strings as valid C strings
919 pprStringInCStyle :: [Word8] -> SDoc
920 pprStringInCStyle s = doubleQuotes (text (concatMap charToC s))
922 charToC :: Word8 -> String
924 case chr (fromIntegral w) of
928 c | c >= ' ' && c <= '~' -> [c]
929 | otherwise -> ['\\',
930 chr (ord '0' + ord c `div` 64),
931 chr (ord '0' + ord c `div` 8 `mod` 8),
932 chr (ord '0' + ord c `mod` 8)]
934 -- ---------------------------------------------------------------------------
935 -- Initialising static objects with floating-point numbers. We can't
936 -- just emit the floating point number, because C will cast it to an int
937 -- by rounding it. We want the actual bit-representation of the float.
939 -- This is a hack to turn the floating point numbers into ints that we
940 -- can safely initialise to static locations.
943 | machRepByteWidth F64 == 2 * wORD_SIZE = True
944 | machRepByteWidth F64 == wORD_SIZE = False
945 | otherwise = panic "big_doubles"
947 castFloatToIntArray :: STUArray s Int Float -> ST s (STUArray s Int Int)
948 castFloatToIntArray = castSTUArray
950 castDoubleToIntArray :: STUArray s Int Double -> ST s (STUArray s Int Int)
951 castDoubleToIntArray = castSTUArray
953 -- floats are always 1 word
954 floatToWord :: Rational -> CmmLit
957 arr <- newArray_ ((0::Int),0)
958 writeArray arr 0 (fromRational r)
959 arr' <- castFloatToIntArray arr
960 i <- readArray arr' 0
961 return (CmmInt (toInteger i) wordRep)
964 doubleToWords :: Rational -> [CmmLit]
966 | big_doubles -- doubles are 2 words
968 arr <- newArray_ ((0::Int),1)
969 writeArray arr 0 (fromRational r)
970 arr' <- castDoubleToIntArray arr
971 i1 <- readArray arr' 0
972 i2 <- readArray arr' 1
973 return [ CmmInt (toInteger i1) wordRep
974 , CmmInt (toInteger i2) wordRep
977 | otherwise -- doubles are 1 word
979 arr <- newArray_ ((0::Int),0)
980 writeArray arr 0 (fromRational r)
981 arr' <- castDoubleToIntArray arr
982 i <- readArray arr' 0
983 return [ CmmInt (toInteger i) wordRep ]
986 -- ---------------------------------------------------------------------------
990 wordShift = machRepLogWidth wordRep
992 commafy :: [SDoc] -> SDoc
993 commafy xs = hsep $ punctuate comma xs
995 -- Print in C hex format: 0x13fa
996 pprHexVal :: Integer -> MachRep -> SDoc
997 pprHexVal 0 _ = ptext SLIT("0x0")
999 | w < 0 = parens (char '-' <> ptext SLIT("0x") <> go (-w) <> repsuffix rep)
1000 | otherwise = ptext SLIT("0x") <> go w <> repsuffix rep
1002 -- type suffix for literals:
1003 -- Integer literals are unsigned in Cmm/C. We explicitly cast to
1004 -- signed values for doing signed operations, but at all other
1005 -- times values are unsigned. This also helps eliminate occasional
1006 -- warnings about integer overflow from gcc.
1008 -- on 32-bit platforms, add "ULL" to 64-bit literals
1009 repsuffix I64 | wORD_SIZE == 4 = ptext SLIT("ULL")
1010 -- on 64-bit platforms with 32-bit int, add "L" to 64-bit literals
1011 repsuffix I64 | cINT_SIZE == 4 = ptext SLIT("UL")
1012 repsuffix _ = char 'U'
1017 (q,r) = w' `quotRem` 16
1018 dig | r < 10 = char (chr (fromInteger r + ord '0'))
1019 | otherwise = char (chr (fromInteger r - 10 + ord 'a'))