2 % (c) The AQUA Project, Glasgow University, 1993-1998
6 module StixPrim ( amodeToStix, amodeToStix', foreignCallCode )
9 #include "HsVersions.h"
14 import PprAbsC ( pprAmode )
15 import AbsCSyn hiding ( spRel )
16 import AbsCUtils ( getAmodeRep, mixedTypeLocn )
17 import SMRep ( fixedHdrSize )
18 import Literal ( Literal(..), word2IntLit )
19 import MachOp ( MachOp(..) )
20 import PrimRep ( PrimRep(..), getPrimRepSizeInBytes )
21 import UniqSupply ( returnUs, thenUs, getUniqueUs, UniqSM )
22 import Constants ( wORD_SIZE,
23 mIN_INTLIKE, mIN_CHARLIKE, uF_UPDATEE, bLOCK_SIZE,
24 rESERVED_STACK_WORDS )
25 import CLabel ( mkIntlikeClosureLabel, mkCharlikeClosureLabel,
26 mkMAP_FROZEN_infoLabel,
28 import ForeignCall ( ForeignCall(..), CCallSpec(..), CCallTarget(..),
29 CCallConv(..), playSafe, playThreadSafe )
31 import Util ( notNull )
38 The main honchos here are primCode and foreignCallCode, which handle the guts of COpStmts.
42 :: [CAddrMode] -- results
44 -> [CAddrMode] -- args
45 -> UniqSM StixStmtList
48 %************************************************************************
50 \subsubsection{Code for foreign calls}
52 %************************************************************************
54 First, the dreaded @ccall@. We can't handle @casm@s.
56 Usually, this compiles to an assignment, but when the left-hand side
57 is empty, we just perform the call and ignore the result.
59 btw Why not let programmer use casm to provide assembly code instead
62 ToDo: saving/restoring of volatile regs around ccalls.
64 JRS, 001113: always do the call of suspendThread and resumeThread as a ccall
65 rather than inheriting the calling convention of the thing which we're really
69 foreignCallCode lhs call@(CCall (CCallSpec ctarget cconv safety)) rhs
71 | not (playSafe safety)
72 = returnUs (\xs -> ccall : xs)
75 = save_thread_state `thenUs` \ save ->
76 load_thread_state `thenUs` \ load ->
77 getUniqueUs `thenUs` \ uniq ->
79 id = StixTemp (StixVReg uniq IntRep)
82 | playThreadSafe safety = 1
85 suspend = StAssignReg IntRep id
86 (StCall (Left FSLIT("suspendThread")) {-no:cconv-} CCallConv
87 IntRep [StReg stgBaseReg, StInt is_threadSafe ])
89 (StCall (Left FSLIT("resumeThread")) {-no:cconv-} CCallConv
90 VoidRep [StReg id, StInt is_threadSafe ])
92 returnUs (\xs -> save (suspend : ccall : resume : load xs))
97 StaticTarget nm -> (rhs, Left nm)
98 DynamicTarget | notNull rhs -- an assertion
99 -> (tail rhs, Right (amodeToStix (head rhs)))
101 -> ncgPrimopMoan "Native code generator can't handle foreign call"
104 stix_args = map amodeToStix' cargs
107 [] -> StVoidable (StCall stix_target cconv VoidRep stix_args)
108 [lhs] -> mkStAssign pk lhs' (StCall stix_target cconv pk stix_args)
110 lhs' = amodeToStix lhs
111 pk = case getAmodeRep lhs of
113 DoubleRep -> DoubleRep
115 Word64Rep -> Word64Rep
119 %************************************************************************
121 \subsubsection{Code for @CAddrMode@s}
123 %************************************************************************
125 When a character is fetched from a mixed type location, we have to do
126 an extra cast. This is reflected in amodeCode', which is for rhs
127 amodes that might possibly need the extra cast.
130 amodeToStix, amodeToStix' :: CAddrMode -> StixExpr
132 amodeToStix'{-'-} am@(CVal rr CharRep)
133 | mixedTypeLocn am = StMachOp MO_NatS_to_32U [amodeToStix am]
134 | otherwise = amodeToStix am
139 amodeToStix am@(CVal rr CharRep)
141 = StInd IntRep (amodeToStix (CAddr rr))
143 amodeToStix (CVal rr pk) = StInd pk (amodeToStix (CAddr rr))
145 amodeToStix (CAddr (SpRel off))
146 = StIndex PtrRep (StReg stgSp) (StInt (toInteger (iBox off)))
148 amodeToStix (CAddr (HpRel off))
149 = StIndex IntRep (StReg stgHp) (StInt (toInteger (- (iBox off))))
151 amodeToStix (CAddr (NodeRel off))
152 = StIndex IntRep (StReg stgNode) (StInt (toInteger (iBox off)))
154 amodeToStix (CAddr (CIndex base off pk))
155 = StIndex pk (amodeToStix base) (amodeToStix off)
157 amodeToStix (CReg magic) = StReg (StixMagicId magic)
158 amodeToStix (CTemp uniq pk) = StReg (StixTemp (StixVReg uniq pk))
160 amodeToStix (CLbl lbl _) = StCLbl lbl
162 -- For CharLike and IntLike, we attempt some trivial constant-folding here.
164 amodeToStix (CCharLike (CLit (MachChar c)))
165 = StIndex Word8Rep cHARLIKE_closure (StInt (toInteger off))
167 off = charLikeSize * (c - mIN_CHARLIKE)
169 amodeToStix (CCharLike x)
170 = panic "amodeToStix.CCharLike"
172 amodeToStix (CIntLike (CLit (MachInt i)))
173 = StIndex Word8Rep iNTLIKE_closure (StInt (toInteger off))
175 off = intLikeSize * (fromInteger (i - mIN_INTLIKE))
177 amodeToStix (CIntLike x)
178 = panic "amodeToStix.CIntLike"
180 amodeToStix (CLit core)
182 MachChar c -> StInt (toInteger c)
183 MachStr s -> StString s
184 MachNullAddr -> StInt 0
186 MachWord w -> case word2IntLit core of MachInt iw -> StInt iw
187 MachLitLit s _ -> litLitErr
188 -- dreadful, but rare.
189 MachLabel l (Just x) -> StCLbl (mkForeignLabel (mkFastString (unpackFS l ++ '@':show x)) False)
190 MachLabel l _ -> StCLbl (mkForeignLabel l False{-ToDo: dynamic-})
191 MachFloat d -> StFloat d
192 MachDouble d -> StDouble d
193 _ -> panic "amodeToStix:core literal"
195 amodeToStix (CMacroExpr _ macro [arg])
197 arg_amode = amodeToStix arg
200 ENTRY_CODE -> arg_amode
201 ARG_TAG -> arg_amode -- just an integer no. of words
203 #ifdef WORDS_BIGENDIAN
205 [StInd WordRep (StIndex PtrRep arg_amode
206 (StInt (toInteger (-1)))),
210 [StInd WordRep (StIndex PtrRep arg_amode
211 (StInt (toInteger (-1)))),
215 -> StInd PtrRep (StIndex PtrRep arg_amode
216 (StInt (toInteger uF_UPDATEE)))
218 BYTE_ARR_CTS -> StIndex IntRep arg_amode arrWordsHS
219 PTRS_ARR_CTS -> StIndex PtrRep arg_amode arrPtrsHS
220 ForeignObj_CLOSURE_DATA -> StInd PtrRep (StIndex PtrRep arg_amode fixedHS)
224 = pprPanic "StixPrim.amodeToStix" (pprAmode other)
227 = ncgPrimopMoan "native code generator can't handle lit-lits" empty
230 Sizes of the CharLike and IntLike closures that are arranged as arrays
231 in the data segment. (These are in bytes.)
234 -- The INTLIKE base pointer
236 iNTLIKE_closure :: StixExpr
237 iNTLIKE_closure = StCLbl mkIntlikeClosureLabel
241 cHARLIKE_closure :: StixExpr
242 cHARLIKE_closure = StCLbl mkCharlikeClosureLabel
244 mutArrPtrsFrozen_info = StCLbl mkMAP_FROZEN_infoLabel
246 -- these are the sizes of charLike and intLike closures, in _bytes_.
247 charLikeSize = (fixedHdrSize + 1) * (getPrimRepSizeInBytes PtrRep)
248 intLikeSize = (fixedHdrSize + 1) * (getPrimRepSizeInBytes PtrRep)
254 = getUniqueUs `thenUs` \ tso_uq ->
255 let tso = StixTemp (StixVReg tso_uq PtrRep) in
257 StAssignReg PtrRep tso (StReg stgCurrentTSO)
260 [StReg tso, StInt (toInteger (TSO_SP*BYTES_PER_WORD))])
264 [StReg stgCurrentNursery,
265 StInt (toInteger (BDESCR_FREE * BYTES_PER_WORD))])
267 [StReg stgHp, StInt (toInteger (1 * BYTES_PER_WORD))])
272 = getUniqueUs `thenUs` \ tso_uq ->
273 let tso = StixTemp (StixVReg tso_uq PtrRep) in
275 StAssignReg PtrRep tso (StReg stgCurrentTSO)
280 [StReg tso, StInt (toInteger (TSO_SP*BYTES_PER_WORD))]))
285 StInt (toInteger ((TSO_STACK + rESERVED_STACK_WORDS)
292 [StReg stgCurrentNursery,
293 StInt (toInteger (BDESCR_FREE * BYTES_PER_WORD))]),
294 StInt (toInteger (1 * BYTES_PER_WORD))
300 (StIndex PtrRep (StReg stgCurrentNursery)
301 (StInt (toInteger BDESCR_START))
305 [StMachOp MO_NatU_Mul
307 (StIndex PtrRep (StReg stgCurrentNursery)
308 (StInt (toInteger BDESCR_BLOCKS))),
309 StInt (toInteger bLOCK_SIZE{-in bytes-})
311 StInt (1 * BYTES_PER_WORD)