X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2FnativeGen%2FStix.lhs;h=9f4a5ea6600be821b49ef597eb1b77cf0e66e4f5;hb=553e90d9a32ee1b1809430f260c401cc4169c6c7;hp=5eb0362ddcc5ac15d4ebce2851b8677d7acf23e4;hpb=7f748c5f33cb1ea2391bb5a45168e1ef19c2ad4f;p=ghc-hetmet.git diff --git a/ghc/compiler/nativeGen/Stix.lhs b/ghc/compiler/nativeGen/Stix.lhs index 5eb0362..9f4a5ea 100644 --- a/ghc/compiler/nativeGen/Stix.lhs +++ b/ghc/compiler/nativeGen/Stix.lhs @@ -4,149 +4,240 @@ \begin{code} module Stix ( - CodeSegment(..), StixReg(..), StixTree(..), StixTreeList, - sStLitLbl, pprStixTrees, - - stgBaseReg, stgNode, stgSp, stgSu, stgSpLim, stgHp, stgHpLim, stgTagReg, - getUniqLabelNCG, - - fixedHS, arrHS + CodeSegment(..), StixReg(..), StixExpr(..), StixVReg(..), + StixStmt(..), mkStAssign, StixStmtList, + pprStixStmts, pprStixStmt, pprStixExpr, pprStixReg, + stixStmt_CountTempUses, stixStmt_Subst, + liftStrings, repOfStixExpr, + DestInfo(..), hasDestInfo, + + stgBaseReg, stgNode, stgSp, stgSpLim, + stgHp, stgHpLim, stgHpAlloc, stgTagReg, stgR9, stgR10, + stgCurrentTSO, stgCurrentNursery, + + fixedHS, arrWordsHS, arrPtrsHS, + + NatM, initNat, thenNat, returnNat, + mapNat, mapAndUnzipNat, mapAccumLNat, + getUniqueNat, getDeltaNat, setDeltaNat, + NatM_State, mkNatM_State, + uniqOfNatM_State, deltaOfNatM_State, importsOfNatM_State, + addImportNat, + + getUniqLabelNCG, getNatLabelNCG, + ncgPrimopMoan, + + -- Information about the target arch + ncg_target_is_32bit ) where #include "HsVersions.h" -import Ratio ( Rational ) - import AbsCSyn ( node, tagreg, MagicId(..) ) import AbsCUtils ( magicIdPrimRep ) -import CallConv ( CallConv, pprCallConv ) -import CLabel ( mkAsmTempLabel, CLabel, pprCLabel, pprCLabel_asm ) -import PrimRep ( PrimRep, showPrimRep ) -import PrimOp ( PrimOp, pprPrimOp ) +import ForeignCall ( CCallConv ) +import CLabel ( mkAsmTempLabel, CLabel, pprCLabel ) +import PrimRep ( PrimRep(..) ) +import MachOp ( MachOp(..), pprMachOp, resultRepOfMachOp ) import Unique ( Unique ) -import SMRep ( fixedHdrSize, arrHdrSize ) -import UniqSupply ( returnUs, thenUs, getUniqueUs, UniqSM ) +import SMRep ( fixedHdrSize, arrWordsHdrSize, arrPtrsHdrSize ) +import UniqSupply ( UniqSupply, splitUniqSupply, uniqFromSupply, + UniqSM, thenUs, returnUs, getUniqueUs ) +import Constants ( wORD_SIZE ) import Outputable -\end{code} - -Here is the tag at the nodes of our @StixTree@. Notice its -relationship with @PrimOp@ in prelude/PrimOp. - -\begin{code} -data StixTree - = -- Segment (text or data) - - StSegment CodeSegment - - -- We can tag the leaves with constants/immediates. +import FastTypes +import FastString - | StInt Integer -- ** add Kind at some point - | StDouble Rational - | StString FAST_STRING - | StLitLbl SDoc -- literal labels - -- (will be _-prefixed on some machines) - - | StCLbl CLabel -- labels that we might index into +import UNSAFE_IO ( unsafePerformIO ) - -- Abstract registers of various kinds +import Ratio ( Rational ) +import IO ( hPutStrLn, stderr ) +\end{code} - | StReg StixReg +Two types, StixStmt and StixValue, define Stix. - -- A typed offset from a base location +\begin{code} - | StIndex PrimRep StixTree StixTree -- kind, base, offset +-- Non-value trees; ones executed for their side-effect. +data StixStmt - -- An indirection from an address to its contents. + = -- Directive for the assembler to change segment + StSegment CodeSegment - | StInd PrimRep StixTree + -- Assembly-language comments + | StComment FastString - -- Assignment is typed to determine size and register placement + -- Assignments are typed to determine size and register placement. + -- Assign a value to a StixReg + | StAssignReg PrimRep StixReg StixExpr - | StAssign PrimRep StixTree StixTree -- dst, src + -- Assign a value to memory. First tree indicates the address to be + -- assigned to, so there is an implicit dereference here. + | StAssignMem PrimRep StixExpr StixExpr -- dst, src -- A simple assembly label that we might jump to. - | StLabel CLabel -- A function header and footer - | StFunBegin CLabel | StFunEnd CLabel - -- An unconditional jump. This instruction is terminal. - -- Dynamic targets are allowed - - | StJump StixTree + -- An unconditional jump. This instruction may or may not jump + -- out of the register allocation domain (basic block, more or + -- less). For correct register allocation when this insn is used + -- to jump through a jump table, we optionally allow a list of + -- the exact targets to be attached, so that the allocator can + -- easily construct the exact flow edges leaving this insn. + -- Dynamic targets are allowed. + | StJump DestInfo StixExpr -- A fall-through, from slow to fast - | StFallThrough CLabel -- A conditional jump. This instruction can be non-terminal :-) -- Only static, local, forward labels are allowed - - | StCondJump CLabel StixTree + | StCondJump CLabel StixExpr -- Raw data (as in an info table). + | StData PrimRep [StixExpr] + -- String which has been lifted to the top level (sigh). + | StDataString FastString + + -- A value computed only for its side effects; result is discarded + -- (A handy trapdoor to allow CCalls with no results to appear as + -- statements). + | StVoidable StixExpr + + +-- Helper fn to make Stix assignment statements where the +-- lvalue masquerades as a StixExpr. A kludge that should +-- be done away with. +mkStAssign :: PrimRep -> StixExpr -> StixExpr -> StixStmt +mkStAssign rep (StReg reg) rhs + = StAssignReg rep reg rhs +mkStAssign rep (StInd rep' addr) rhs + | rep `isCloseEnoughTo` rep' + = StAssignMem rep addr rhs + | otherwise + = --pprPanic "Stix.mkStAssign: mismatched reps" (ppr rep <+> ppr rep') + --trace ("Stix.mkStAssign: mismatched reps: " ++ showSDoc (ppr rep <+> ppr rep')) ( + StAssignMem rep addr rhs + --) + where + isCloseEnoughTo r1 r2 + = r1 == r2 || (wordIsh r1 && wordIsh r2) + wordIsh rep + = rep `elem` [IntRep, WordRep, PtrRep, AddrRep, CodePtrRep, RetRep ] + -- determined by looking at PrimRep.showPrimRep + +-- Stix trees which denote a value. +data StixExpr + = -- Literals + StInt Integer -- ** add Kind at some point + | StFloat Rational + | StDouble Rational + | StString FastString + | StCLbl CLabel -- labels that we might index into - | StData PrimRep [StixTree] + -- Abstract registers of various kinds + | StReg StixReg - -- Primitive Operations + -- A typed offset from a base location + | StIndex PrimRep StixExpr StixExpr -- kind, base, offset + + -- An indirection from an address to its contents. + | StInd PrimRep StixExpr - | StPrim PrimOp [StixTree] + -- Primitive Operations + | StMachOp MachOp [StixExpr] -- Calls to C functions + | StCall (Either FastString StixExpr) -- Left: static, Right: dynamic + CCallConv PrimRep [StixExpr] - | StCall FAST_STRING CallConv PrimRep [StixTree] - -- Assembly-language comments +-- What's the PrimRep of the value denoted by this StixExpr? +repOfStixExpr :: StixExpr -> PrimRep +repOfStixExpr (StInt _) = IntRep +repOfStixExpr (StFloat _) = FloatRep +repOfStixExpr (StDouble _) = DoubleRep +repOfStixExpr (StString _) = PtrRep +repOfStixExpr (StCLbl _) = PtrRep +repOfStixExpr (StReg reg) = repOfStixReg reg +repOfStixExpr (StIndex _ _ _) = PtrRep +repOfStixExpr (StInd rep _) = rep +repOfStixExpr (StCall target conv retrep args) = retrep +repOfStixExpr (StMachOp mop args) = resultRepOfMachOp mop + - | StComment FAST_STRING +-- used by insnFuture in RegAllocInfo.lhs +data DestInfo + = NoDestInfo -- no supplied dests; infer from context + | DestInfo [CLabel] -- precisely these dests and no others -sStLitLbl :: FAST_STRING -> StixTree -sStLitLbl s = StLitLbl (ptext s) +hasDestInfo NoDestInfo = False +hasDestInfo (DestInfo _) = True +pprDests :: DestInfo -> SDoc +pprDests NoDestInfo = text "NoDestInfo" +pprDests (DestInfo dsts) = brackets (hsep (map pprCLabel dsts)) -pprStixTrees :: [StixTree] -> SDoc -pprStixTrees ts + +pprStixStmts :: [StixStmt] -> SDoc +pprStixStmts ts = vcat [ - vcat (map ppStixTree ts), + vcat (map pprStixStmt ts), char ' ', char ' ' ] -paren t = char '(' <> t <> char ')' -ppStixTree :: StixTree -> SDoc -ppStixTree t +pprStixExpr :: StixExpr -> SDoc +pprStixExpr t + = case t of + StCLbl lbl -> pprCLabel lbl + StInt i -> (if i < 0 then parens else id) (integer i) + StFloat rat -> parens (text "Float" <+> rational rat) + StDouble rat -> parens (text "Double" <+> rational rat) + StString str -> parens (text "Str `" <> ftext str <> char '\'') + StIndex k b o -> parens (pprStixExpr b <+> char '+' <> + ppr k <+> pprStixExpr o) + StInd k t -> ppr k <> char '[' <> pprStixExpr t <> char ']' + StReg reg -> pprStixReg reg + StMachOp op args -> pprMachOp op + <> parens (hsep (punctuate comma (map pprStixExpr args))) + StCall fn cc k args + -> parens (text "Call" <+> targ <+> + ppr cc <+> ppr k <+> + hsep (map pprStixExpr args)) + where + targ = case fn of + Left t_static -> ftext t_static + Right t_dyn -> parens (pprStixExpr t_dyn) + +pprStixStmt :: StixStmt -> SDoc +pprStixStmt t = case t of - StSegment cseg -> paren (ppCodeSegment cseg) - StInt i -> paren (integer i) - StDouble rat -> paren (text "Double" <+> rational rat) - StString str -> paren (text "Str" <+> ptext str) - StComment str -> paren (text "Comment" <+> ptext str) - StLitLbl sd -> sd - StCLbl lbl -> pprCLabel lbl - StReg reg -> ppStixReg reg - StIndex k b o -> paren (ppStixTree b <+> char '+' <> - pprPrimRep k <+> ppStixTree o) - StInd k t -> pprPrimRep k <> char '[' <> ppStixTree t <> char ']' - StAssign k d s -> ppStixTree d <> text " :=" <> pprPrimRep k - <> text " " <> ppStixTree s - StLabel ll -> pprCLabel ll <+> char ':' - StFunBegin ll -> char ' ' $$ paren (text "FunBegin" <+> pprCLabel ll) - StFunEnd ll -> paren (text "FunEnd" <+> pprCLabel ll) - StJump t -> paren (text "Jump" <+> ppStixTree t) - StFallThrough ll -> paren (text "FallThru" <+> pprCLabel ll) - StCondJump l t -> paren (text "JumpC" <+> pprCLabel l <+> ppStixTree t) - StData k ds -> paren (text "Data" <+> pprPrimRep k <+> - hsep (map ppStixTree ds)) - StPrim op ts -> paren (text "Prim" <+> pprPrimOp op <+> hsep (map ppStixTree ts)) - StCall nm cc k args - -> paren (text "Call" <+> ptext nm <+> - pprCallConv cc <+> pprPrimRep k <+> hsep (map ppStixTree args)) - where - pprPrimRep = text . showPrimRep + StSegment cseg -> parens (ppCodeSegment cseg) + StComment str -> parens (text "Comment" <+> ftext str) + StAssignReg pr reg rhs + -> pprStixReg reg <> text " :=" <> ppr pr + <> text " " <> pprStixExpr rhs + StAssignMem pr addr rhs + -> ppr pr <> char '[' <> pprStixExpr addr <> char ']' + <> text " :=" <> ppr pr + <> text " " <> pprStixExpr rhs + StLabel ll -> pprCLabel ll <+> char ':' + StFunBegin ll -> char ' ' $$ parens (text "FunBegin" <+> pprCLabel ll) + StFunEnd ll -> parens (text "FunEnd" <+> pprCLabel ll) + StJump dsts t -> parens (text "Jump" <+> pprDests dsts <+> pprStixExpr t) + StFallThrough ll -> parens (text "FallThru" <+> pprCLabel ll) + StCondJump l t -> parens (text "JumpC" <+> pprCLabel l + <+> pprStixExpr t) + StData k ds -> parens (text "Data" <+> ppr k <+> + hsep (map pprStixExpr ds)) + StDataString str -> parens (text "DataString" <+> ppr str) + StVoidable expr -> text "(void)" <+> pprStixExpr expr \end{code} Stix registers can have two forms. They {\em may} or {\em may not} @@ -156,22 +247,30 @@ map to real, machine-level registers. data StixReg = StixMagicId MagicId -- Regs which are part of the abstract machine model - | StixTemp Unique PrimRep -- "Regs" which model local variables (CTemps) in - -- the abstract C. + | StixTemp StixVReg -- "Regs" which model local variables (CTemps) in + -- the abstract C. + +pprStixReg (StixMagicId mid) = ppMId mid +pprStixReg (StixTemp temp) = pprStixVReg temp + +repOfStixReg (StixTemp (StixVReg u pr)) = pr +repOfStixReg (StixMagicId mid) = magicIdPrimRep mid + +data StixVReg + = StixVReg Unique PrimRep + +pprStixVReg (StixVReg u pr) = hcat [text "VReg(", ppr u, colon, ppr pr, char ')'] -ppStixReg (StixMagicId mid) - = ppMId mid -ppStixReg (StixTemp u pr) - = hcat [text "Temp(", ppr u, ppr pr, char ')'] ppMId BaseReg = text "BaseReg" -ppMId (VanillaReg kind n) = hcat [text "IntReg(", int (I# n), char ')'] -ppMId (FloatReg n) = hcat [text "FltReg(", int (I# n), char ')'] -ppMId (DoubleReg n) = hcat [text "DblReg(", int (I# n), char ')'] -ppMId (LongReg kind n) = hcat [text "LongReg(", int (I# n), char ')'] +ppMId (VanillaReg kind n) = hcat [ppr kind, text "IntReg(", + int (iBox n), char ')'] +ppMId (FloatReg n) = hcat [text "FltReg(", int (iBox n), char ')'] +ppMId (DoubleReg n) = hcat [text "DblReg(", int (iBox n), char ')'] +ppMId (LongReg kind n) = hcat [ppr kind, text "LongReg(", + int (iBox n), char ')'] ppMId Sp = text "Sp" -ppMId Su = text "Su" ppMId SpLim = text "SpLim" ppMId Hp = text "Hp" ppMId HpLim = text "HpLim" @@ -184,31 +283,347 @@ segment (or that it has no segments at all, and we can lump these together). \begin{code} -data CodeSegment = DataSegment | TextSegment deriving (Eq, Show) +data CodeSegment + = DataSegment + | TextSegment + | RoDataSegment + deriving (Eq, Show) + ppCodeSegment = text . show -type StixTreeList = [StixTree] -> [StixTree] +type StixStmtList = [StixStmt] -> [StixStmt] \end{code} Stix Trees for STG registers: \begin{code} -stgBaseReg, stgNode, stgSp, stgSu, stgSpLim, stgHp, stgHpLim - :: StixTree - -stgBaseReg = StReg (StixMagicId BaseReg) -stgNode = StReg (StixMagicId node) -stgTagReg = StReg (StixMagicId tagreg) -stgSp = StReg (StixMagicId Sp) -stgSu = StReg (StixMagicId Su) -stgSpLim = StReg (StixMagicId SpLim) -stgHp = StReg (StixMagicId Hp) -stgHpLim = StReg (StixMagicId HpLim) +stgBaseReg, stgNode, stgSp, stgSpLim, stgHp, stgHpLim :: StixReg + +stgBaseReg = StixMagicId BaseReg +stgNode = StixMagicId node +stgTagReg = StixMagicId tagreg +stgSp = StixMagicId Sp +stgSpLim = StixMagicId SpLim +stgHp = StixMagicId Hp +stgHpLim = StixMagicId HpLim +stgHpAlloc = StixMagicId HpAlloc +stgCurrentTSO = StixMagicId CurrentTSO +stgCurrentNursery = StixMagicId CurrentNursery +stgR9 = StixMagicId (VanillaReg WordRep (_ILIT 9)) +stgR10 = StixMagicId (VanillaReg WordRep (_ILIT 10)) + +getNatLabelNCG :: NatM CLabel +getNatLabelNCG + = getUniqueNat `thenNat` \ u -> + returnNat (mkAsmTempLabel u) getUniqLabelNCG :: UniqSM CLabel getUniqLabelNCG - = getUniqueUs `thenUs` \ u -> + = getUniqueUs `thenUs` \ u -> returnUs (mkAsmTempLabel u) -fixedHS = StInt (toInteger fixedHdrSize) -arrHS = StInt (toInteger arrHdrSize) +fixedHS = StInt (toInteger fixedHdrSize) +arrWordsHS = StInt (toInteger arrWordsHdrSize) +arrPtrsHS = StInt (toInteger arrPtrsHdrSize) +\end{code} + +Stix optimisation passes may wish to find out how many times a +given temporary appears in a tree, so as to be able to decide +whether or not to inline the assignment's RHS at usage site(s). + +\begin{code} +stixExpr_CountTempUses :: Unique -> StixExpr -> Int +stixExpr_CountTempUses u t + = let qs = stixStmt_CountTempUses u + qe = stixExpr_CountTempUses u + qr = stixReg_CountTempUses u + in + case t of + StReg reg -> qr reg + StIndex pk t1 t2 -> qe t1 + qe t2 + StInd pk t1 -> qe t1 + StMachOp mop ts -> sum (map qe ts) + StCall (Left nm) cconv pk ts -> sum (map qe ts) + StCall (Right f) cconv pk ts -> sum (map qe ts) + qe f + StInt _ -> 0 + StFloat _ -> 0 + StDouble _ -> 0 + StString _ -> 0 + StCLbl _ -> 0 + +stixStmt_CountTempUses :: Unique -> StixStmt -> Int +stixStmt_CountTempUses u t + = let qe = stixExpr_CountTempUses u + qr = stixReg_CountTempUses u + qv = stixVReg_CountTempUses u + in + case t of + StAssignReg pk reg rhs -> qr reg + qe rhs + StAssignMem pk addr rhs -> qe addr + qe rhs + StJump dsts t1 -> qe t1 + StCondJump lbl t1 -> qe t1 + StData pk ts -> sum (map qe ts) + StVoidable expr -> qe expr + StSegment _ -> 0 + StFunBegin _ -> 0 + StFunEnd _ -> 0 + StFallThrough _ -> 0 + StComment _ -> 0 + StLabel _ -> 0 + StDataString _ -> 0 + +stixReg_CountTempUses u reg + = case reg of + StixTemp vreg -> stixVReg_CountTempUses u vreg + StixMagicId mid -> 0 + +stixVReg_CountTempUses u (StixVReg uu pr) + = if u == uu then 1 else 0 +\end{code} + +If we do decide to inline a temporary binding, the following functions +do the biz. + +\begin{code} +stixStmt_Subst :: Unique -> StixExpr -> StixStmt -> StixStmt +stixStmt_Subst u new_u in_this_tree + = stixStmt_MapUniques f in_this_tree + where + f :: Unique -> Maybe StixExpr + f uu = if uu == u then Just new_u else Nothing + + +stixExpr_MapUniques :: (Unique -> Maybe StixExpr) -> StixExpr -> StixExpr +stixExpr_MapUniques f t + = let qe = stixExpr_MapUniques f + qs = stixStmt_MapUniques f + qr = stixReg_MapUniques f + in + case t of + StReg reg -> case qr reg of + Nothing -> StReg reg + Just xx -> xx + StIndex pk t1 t2 -> StIndex pk (qe t1) (qe t2) + StInd pk t1 -> StInd pk (qe t1) + StMachOp mop args -> StMachOp mop (map qe args) + StCall (Left nm) cconv pk ts -> StCall (Left nm) cconv pk (map qe ts) + StCall (Right f) cconv pk ts -> StCall (Right (qe f)) cconv pk (map qe ts) + StInt _ -> t + StFloat _ -> t + StDouble _ -> t + StString _ -> t + StCLbl _ -> t + +stixStmt_MapUniques :: (Unique -> Maybe StixExpr) -> StixStmt -> StixStmt +stixStmt_MapUniques f t + = let qe = stixExpr_MapUniques f + qs = stixStmt_MapUniques f + qr = stixReg_MapUniques f + qv = stixVReg_MapUniques f + in + case t of + StAssignReg pk reg rhs + -> case qr reg of + Nothing -> StAssignReg pk reg (qe rhs) + Just xx -> panic "stixStmt_MapUniques:StAssignReg" + StAssignMem pk addr rhs -> StAssignMem pk (qe addr) (qe rhs) + StJump dsts t1 -> StJump dsts (qe t1) + StCondJump lbl t1 -> StCondJump lbl (qe t1) + StData pk ts -> StData pk (map qe ts) + StVoidable expr -> StVoidable (qe expr) + StSegment _ -> t + StLabel _ -> t + StFunBegin _ -> t + StFunEnd _ -> t + StFallThrough _ -> t + StComment _ -> t + StDataString _ -> t + + +stixReg_MapUniques :: (Unique -> Maybe StixExpr) -> StixReg -> Maybe StixExpr +stixReg_MapUniques f reg + = case reg of + StixMagicId mid -> Nothing + StixTemp vreg -> stixVReg_MapUniques f vreg + +stixVReg_MapUniques :: (Unique -> Maybe StixExpr) -> StixVReg -> Maybe StixExpr +stixVReg_MapUniques f (StixVReg uu pr) + = f uu +\end{code} + +\begin{code} +-- Lift StStrings out of top-level StDatas, putting them at the end of +-- the block, and replacing them with StCLbls which refer to the lifted-out strings. +{- Motivation for this hackery provided by the following bug: + Stix: + (DataSegment) + Bogon.ping_closure : + (Data P_ Addr.A#_static_info) + (Data StgAddr (Str `alalal')) + (Data P_ (0)) + results in: + .data + .align 8 + .global Bogon_ping_closure + Bogon_ping_closure: + .long Addr_Azh_static_info + .long .Ln1a8 + .Ln1a8: + .byte 0x61 + .byte 0x6C + .byte 0x61 + .byte 0x6C + .byte 0x61 + .byte 0x6C + .byte 0x00 + .long 0 + ie, the Str is planted in-line, when what we really meant was to place + a _reference_ to the string there. liftStrings will lift out all such + strings in top-level data and place them at the end of the block. + + This is still a rather half-baked solution -- to do the job entirely right + would mean a complete traversal of all the Stixes, but there's currently no + real need for it, and it would be slow. Also, potentially there could be + literal types other than strings which need lifting out? +-} + +liftStrings :: [StixStmt] -> UniqSM [StixStmt] +liftStrings stmts + = liftStrings_wrk stmts [] [] + +liftStrings_wrk :: [StixStmt] -- originals + -> [StixStmt] -- (reverse) originals with strings lifted out + -> [(CLabel, FastString)] -- lifted strs, and their new labels + -> UniqSM [StixStmt] + +-- First, examine the original trees and lift out strings in top-level StDatas. +liftStrings_wrk (st:sts) acc_stix acc_strs + = case st of + StData sz datas + -> lift datas acc_strs `thenUs` \ (datas_done, acc_strs1) -> + liftStrings_wrk sts ((StData sz datas_done):acc_stix) acc_strs1 + other + -> liftStrings_wrk sts (other:acc_stix) acc_strs + where + -- Handle a top-level StData + lift [] acc_strs = returnUs ([], acc_strs) + lift (d:ds) acc_strs + = lift ds acc_strs `thenUs` \ (ds_done, acc_strs1) -> + case d of + StString s + -> getUniqueUs `thenUs` \ unq -> + let lbl = mkAsmTempLabel unq in + returnUs ((StCLbl lbl):ds_done, ((lbl,s):acc_strs1)) + other + -> returnUs (other:ds_done, acc_strs1) + +-- When we've run out of original trees, emit the lifted strings. +liftStrings_wrk [] acc_stix acc_strs + = returnUs (reverse acc_stix ++ concatMap f acc_strs) + where + f (lbl,str) = [StSegment RoDataSegment, + StLabel lbl, + StDataString str, + StSegment TextSegment] +\end{code} + +The NCG's monad. + +The monad keeps a UniqSupply, the current stack delta and +a list of imported entities, which is only used for +Darwin (Mac OS X). + +\begin{code} +data NatM_State = NatM_State UniqSupply Int [FastString] +type NatM result = NatM_State -> (result, NatM_State) + +mkNatM_State :: UniqSupply -> Int -> NatM_State +mkNatM_State us delta = NatM_State us delta [] + +uniqOfNatM_State (NatM_State us delta imports) = us +deltaOfNatM_State (NatM_State us delta imports) = delta +importsOfNatM_State (NatM_State us delta imports) = imports + +initNat :: NatM_State -> NatM a -> (a, NatM_State) +initNat init_st m = case m init_st of { (r,st) -> (r,st) } + +thenNat :: NatM a -> (a -> NatM b) -> NatM b +thenNat expr cont st + = case expr st of { (result, st') -> cont result st' } + +returnNat :: a -> NatM a +returnNat result st = (result, st) + +mapNat :: (a -> NatM b) -> [a] -> NatM [b] +mapNat f [] = returnNat [] +mapNat f (x:xs) + = f x `thenNat` \ r -> + mapNat f xs `thenNat` \ rs -> + returnNat (r:rs) + +mapAndUnzipNat :: (a -> NatM (b,c)) -> [a] -> NatM ([b],[c]) +mapAndUnzipNat f [] = returnNat ([],[]) +mapAndUnzipNat f (x:xs) + = f x `thenNat` \ (r1, r2) -> + mapAndUnzipNat f xs `thenNat` \ (rs1, rs2) -> + returnNat (r1:rs1, r2:rs2) + +mapAccumLNat :: (acc -> x -> NatM (acc, y)) + -> acc + -> [x] + -> NatM (acc, [y]) + +mapAccumLNat f b [] + = returnNat (b, []) +mapAccumLNat f b (x:xs) + = f b x `thenNat` \ (b__2, x__2) -> + mapAccumLNat f b__2 xs `thenNat` \ (b__3, xs__2) -> + returnNat (b__3, x__2:xs__2) + + +getUniqueNat :: NatM Unique +getUniqueNat (NatM_State us delta imports) + = case splitUniqSupply us of + (us1,us2) -> (uniqFromSupply us1, (NatM_State us2 delta imports)) + +getDeltaNat :: NatM Int +getDeltaNat st@(NatM_State us delta imports) + = (delta, st) + +setDeltaNat :: Int -> NatM () +setDeltaNat delta (NatM_State us _ imports) + = ((), NatM_State us delta imports) + +addImportNat :: FastString -> NatM () +addImportNat imp (NatM_State us delta imports) + = ((), NatM_State us delta (imp:imports)) +\end{code} + +Giving up in a not-too-inelegant way. + +\begin{code} +ncgPrimopMoan :: String -> SDoc -> a +ncgPrimopMoan msg pp_rep + = unsafePerformIO ( + hPutStrLn stderr ( + "\n" ++ + "You've fallen across an unimplemented case in GHC's native code generation\n" ++ + "machinery. You can work around this for the time being by compiling\n" ++ + "this module via the C route, by giving the flag -fvia-C.\n" ++ + "The panic below contains information, intended for the GHC implementors,\n" ++ + "about the exact place where GHC gave up. Please send it to us\n" ++ + "at glasgow-haskell-bugs@haskell.org, so as to encourage us to fix this.\n" + ) + ) + `seq` + pprPanic msg pp_rep +\end{code} + +Information about the target. + +\begin{code} + +ncg_target_is_32bit :: Bool +ncg_target_is_32bit | wORD_SIZE == 4 = True + | wORD_SIZE == 8 = False + \end{code}