X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2FcodeGen%2FCgExpr.lhs;h=d72c7c5a4cd0be9c574fbfc4b8b1ed77a126e858;hb=423d477bfecd490de1449c59325c8776f91d7aac;hp=88771b911c28d8b55bf607a2a09932a2170d7ec9;hpb=553e90d9a32ee1b1809430f260c401cc4169c6c7;p=ghc-hetmet.git diff --git a/ghc/compiler/codeGen/CgExpr.lhs b/ghc/compiler/codeGen/CgExpr.lhs index 88771b9..d72c7c5 100644 --- a/ghc/compiler/codeGen/CgExpr.lhs +++ b/ghc/compiler/codeGen/CgExpr.lhs @@ -1,7 +1,7 @@ % % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998 % -% $Id: CgExpr.lhs,v 1.58 2004/08/10 09:02:41 simonmar Exp $ +% $Id: CgExpr.lhs,v 1.59 2004/08/13 13:05:58 simonmar Exp $ % %******************************************************** %* * @@ -17,38 +17,39 @@ module CgExpr ( cgExpr ) where import Constants ( mAX_SPEC_SELECTEE_SIZE, mAX_SPEC_AP_SIZE ) import StgSyn import CgMonad -import AbsCSyn -import AbsCUtils ( mkAbstractCs, getAmodeRep, shimFCallArg ) -import CLabel ( mkClosureTblLabel ) -import SMRep ( fixedHdrSize ) +import SMRep ( fixedHdrSize, isFollowableArg, CgRep(..), argMachRep, + nonVoidArg, idCgRep, typeCgRep, typeHint, + primRepToCgRep ) import CoreSyn ( AltCon(..) ) +import CgProf ( emitSetCCC ) +import CgHeapery ( layOutDynConstr ) import CgBindery ( getArgAmodes, getArgAmode, CgIdInfo, nukeDeadBindings, addBindC, addBindsC ) import CgCase ( cgCase, saveVolatileVarsAndRegs ) import CgClosure ( cgRhsClosure, cgStdRhsClosure ) import CgCon ( buildDynCon, cgReturnDataCon ) import CgLetNoEscape ( cgLetNoEscapeClosure ) -import CgRetConv ( dataReturnConvPrim ) -import CgTailCall ( cgTailCall, performReturn, performPrimReturn, - mkDynamicAlgReturnCode, mkPrimReturnCode, - tailCallPrimOp, ccallReturnUnboxedTuple - ) -import ClosureInfo ( mkClosureLFInfo, mkSelectorLFInfo, - mkApLFInfo, layOutDynConstr ) -import CostCentre ( sccAbleCostCentre, isSccCountCostCentre ) -import Id ( idPrimRep, Id ) +import CgCallConv ( dataReturnConvPrim ) +import CgTailCall +import CgInfoTbls ( emitDirectReturnInstr ) +import CgForeignCall ( emitForeignCall, shimForeignCallArg ) +import CgPrimOp ( cgPrimOp ) +import CgUtils ( addIdReps, newTemp, assignTemp, cgLit, tagToClosure ) +import ClosureInfo ( mkSelectorLFInfo, mkApLFInfo ) +import Cmm ( CmmExpr(..), CmmStmt(..), CmmReg, nodeReg ) +import MachOp ( wordRep, MachHint ) import VarSet +import Literal ( literalType ) import PrimOp ( primOpOutOfLine, getPrimOpResultInfo, PrimOp(..), PrimOpResultInfo(..) ) -import PrimRep ( PrimRep(..), isFollowableRep ) +import Id ( Id ) import TyCon ( isUnboxedTupleTyCon, isEnumerationTyCon ) -import Type ( Type, typePrimRep, tyConAppArgs, - tyConAppTyCon, repType ) +import Type ( Type, tyConAppArgs, tyConAppTyCon, repType, + PrimRep(VoidRep) ) import Maybes ( maybeToBool ) import ListSetOps ( assocMaybe ) -import Unique ( mkBuiltinUnique ) -import BasicTypes ( TopLevelFlag(..), RecFlag(..) ) +import BasicTypes ( RecFlag(..) ) import Util ( lengthIs ) import Outputable \end{code} @@ -84,8 +85,8 @@ cgExpr (StgApp fun args) = cgTailCall fun args \begin{code} cgExpr (StgConApp con args) - = getArgAmodes args `thenFC` \ amodes -> - cgReturnDataCon con amodes + = do { amodes <- getArgAmodes args + ; cgReturnDataCon con amodes } \end{code} Literals are similar to constructors; they return by putting @@ -94,99 +95,100 @@ top of the stack. \begin{code} cgExpr (StgLit lit) - = performPrimReturn (text "literal" <+> ppr lit) (CLit lit) + = do { cmm_lit <- cgLit lit + ; performPrimReturn rep (CmmLit cmm_lit) } + where + rep = typeCgRep (literalType lit) \end{code} %******************************************************** %* * -%* STG PrimApps (unboxed primitive ops) * +%* PrimOps and foreign calls. %* * %******************************************************** -Here is where we insert real live machine instructions. - -NOTE about _ccall_GC_: +NOTE about "safe" foreign calls: a safe foreign call is never compiled +inline in a case expression. When we see -A _ccall_GC_ is treated as an out-of-line primop (returns True -for primOpOutOfLine) so that when we see the call in case context case (ccall ...) of { ... } -we get a proper stack frame on the stack when we perform it. When we -get in a tail-call position, however, we need to actually perform the -call, so we treat it as an inline primop. + +We generate a proper return address for the alternatives and push the +stack frame before doing the call, so that in the event that the call +re-enters the RTS the stack is in a sane state. \begin{code} -cgExpr (StgOpApp op@(StgFCallOp _ _) args res_ty) - = primRetUnboxedTuple op args res_ty +cgExpr (StgOpApp (StgFCallOp fcall _) stg_args res_ty) = do + {- + First, copy the args into temporaries. We're going to push + a return address right before doing the call, so the args + must be out of the way. + -} + reps_n_amodes <- getArgAmodes stg_args + let + -- Get the *non-void* args, and jiggle them with shimForeignCall + arg_exprs = [ shimForeignCallArg stg_arg expr + | (stg_arg, (rep,expr)) <- stg_args `zip` reps_n_amodes, + nonVoidArg rep] + -- in + arg_tmps <- mapM assignTemp arg_exprs + let + arg_hints = zip arg_tmps (map (typeHint.stgArgType) stg_args) + -- in + {- + Now, allocate some result regs. + -} + (res_reps,res_regs,res_hints) <- newUnboxedTupleRegs res_ty + ccallReturnUnboxedTuple (zip res_reps (map CmmReg res_regs)) $ + emitForeignCall (zip res_regs res_hints) fcall + arg_hints emptyVarSet{-no live vars-} + -- tagToEnum# is special: we need to pull the constructor out of the table, -- and perform an appropriate return. cgExpr (StgOpApp (StgPrimOp TagToEnumOp) [arg] res_ty) = ASSERT(isEnumerationTyCon tycon) - getArgAmode arg `thenFC` \amode -> - -- save the tag in a temporary in case amode overlaps - -- with node. - absC (CAssign dyn_tag amode) `thenC` - performReturn ( - CAssign (CReg node) - (CVal (CIndex - (CLbl (mkClosureTblLabel tycon) PtrRep) - dyn_tag PtrRep) PtrRep)) - (\ sequel -> mkDynamicAlgReturnCode tycon dyn_tag sequel) + do { (_,amode) <- getArgAmode arg + ; amode' <- assignTemp amode -- We're going to use it twice, + -- so save in a temp if non-trivial + ; stmtC (CmmAssign nodeReg (tagToClosure tycon amode')) + ; performReturn (emitAlgReturnCode tycon amode') } where - dyn_tag = CTemp (mkBuiltinUnique 0) IntRep - -- The '0' is just to get a random spare temp - -- - -- if you're reading this code in the attempt to figure + -- If you're reading this code in the attempt to figure -- out why the compiler panic'ed here, it is probably because -- you used tagToEnum# in a non-monomorphic setting, e.g., -- intToTg :: Enum a => Int -> a ; intToTg (I# x#) = tagToEnum# x# - -- -- That won't work. - -- tycon = tyConAppTyCon res_ty cgExpr x@(StgOpApp op@(StgPrimOp primop) args res_ty) - | primOpOutOfLine primop - = tailCallPrimOp primop args - - | otherwise - = getArgAmodes args `thenFC` \ arg_amodes -> - - case (getPrimOpResultInfo primop) of - - ReturnsPrim kind -> - let result_amode = CReg (dataReturnConvPrim kind) in - performReturn - (COpStmt [result_amode] op arg_amodes [{-no vol_regs-}]) - (mkPrimReturnCode (text "primapp)" <+> ppr x)) - - -- otherwise, must be returning an enumerated type (eg. Bool). - -- we've only got the tag in R2, so we have to load the constructor - -- itself into R1. - - ReturnsAlg tycon - | isUnboxedTupleTyCon tycon -> primRetUnboxedTuple op args res_ty - - | isEnumerationTyCon tycon -> - performReturn - (COpStmt [dyn_tag] op arg_amodes [{-no vol_regs-}]) - (\ sequel -> - absC (CAssign (CReg node) closure_lbl) `thenC` - mkDynamicAlgReturnCode tycon dyn_tag sequel) - - where - -- Pull a unique out of thin air to put the tag in. - -- It shouldn't matter if this overlaps with anything - we're - -- about to return anyway. - dyn_tag = CTemp (mkBuiltinUnique 0) IntRep - - closure_lbl = CVal (CIndex - (CLbl (mkClosureTblLabel tycon) PtrRep) - dyn_tag PtrRep) PtrRep - + | primOpOutOfLine primop + = tailCallPrimOp primop args + + | ReturnsPrim VoidRep <- result_info + = do cgPrimOp [] primop args emptyVarSet + performReturn emitDirectReturnInstr + + | ReturnsPrim rep <- result_info + = do cgPrimOp [dataReturnConvPrim (primRepToCgRep rep)] + primop args emptyVarSet + performReturn emitDirectReturnInstr + + | ReturnsAlg tycon <- result_info, isUnboxedTupleTyCon tycon + = do (reps, regs, _hints) <- newUnboxedTupleRegs res_ty + cgPrimOp regs primop args emptyVarSet{-no live vars-} + returnUnboxedTuple (zip reps (map CmmReg regs)) + + | ReturnsAlg tycon <- result_info, isEnumerationTyCon tycon + -- c.f. cgExpr (...TagToEnumOp...) + = do tag_reg <- newTemp wordRep + cgPrimOp [tag_reg] primop args emptyVarSet + stmtC (CmmAssign nodeReg (tagToClosure tycon (CmmReg tag_reg))) + performReturn (emitAlgReturnCode tycon (CmmReg tag_reg)) + where + result_info = getPrimOpResultInfo primop \end{code} %******************************************************** @@ -227,20 +229,21 @@ cgExpr (StgLet (StgRec pairs) expr) \begin{code} cgExpr (StgLetNoEscape live_in_whole_let live_in_rhss bindings body) - = -- Figure out what volatile variables to save - nukeDeadBindings live_in_whole_let `thenC` - saveVolatileVarsAndRegs live_in_rhss - `thenFC` \ (save_assts, rhs_eob_info, maybe_cc_slot) -> + = do { -- Figure out what volatile variables to save + ; nukeDeadBindings live_in_whole_let + ; (save_assts, rhs_eob_info, maybe_cc_slot) + <- saveVolatileVarsAndRegs live_in_rhss -- Save those variables right now! - absC save_assts `thenC` + ; emitStmts save_assts -- Produce code for the rhss -- and add suitable bindings to the environment - cgLetNoEscapeBindings live_in_rhss rhs_eob_info maybe_cc_slot bindings `thenC` + ; cgLetNoEscapeBindings live_in_rhss rhs_eob_info + maybe_cc_slot bindings -- Do the body - setEndOfBlockInfo rhs_eob_info (cgExpr body) + ; setEndOfBlockInfo rhs_eob_info (cgExpr body) } \end{code} @@ -252,18 +255,11 @@ cgExpr (StgLetNoEscape live_in_whole_let live_in_rhss bindings body) SCC expressions are treated specially. They set the current cost centre. + \begin{code} -cgExpr (StgSCC cc expr) - = ASSERT(sccAbleCostCentre cc) - costCentresC - FSLIT("SET_CCC") - [mkCCostCentre cc, mkIntCLit (if isSccCountCostCentre cc then 1 else 0)] - `thenC` - cgExpr expr +cgExpr (StgSCC cc expr) = do emitSetCCC cc; cgExpr expr \end{code} -ToDo: counting of dict sccs ... - %******************************************************** %* * %* Non-top-level bindings * @@ -279,9 +275,9 @@ cgRhs :: Id -> StgRhs -> FCode (Id, CgIdInfo) -- the Id is passed along so a binding can be set up cgRhs name (StgRhsCon maybe_cc con args) - = getArgAmodes args `thenFC` \ amodes -> - buildDynCon name maybe_cc con amodes `thenFC` \ idinfo -> - returnFC (name, idinfo) + = do { amodes <- getArgAmodes args + ; idinfo <- buildDynCon name maybe_cc con amodes + ; returnFC (name, idinfo) } cgRhs name (StgRhsClosure cc bi fvs upd_flag srt args body) = mkRhsClosure name cc bi srt fvs upd_flag args body @@ -328,7 +324,7 @@ mkRhsClosure bndr cc bi srt cgStdRhsClosure bndr cc bi [the_fv] [] body lf_info [StgVarArg the_fv] where lf_info = mkSelectorLFInfo bndr offset_into_int (isUpdatable upd_flag) - (_, params_w_offsets) = layOutDynConstr con idPrimRep params + (_, params_w_offsets) = layOutDynConstr con (addIdReps params) -- Just want the layout maybe_offset = assocMaybe params_w_offsets selectee Just the_offset = maybe_offset @@ -359,7 +355,7 @@ mkRhsClosure bndr cc bi srt body@(StgApp fun_id args) | args `lengthIs` (arity-1) - && all isFollowableRep (map idPrimRep fvs) + && all isFollowableArg (map idCgRep fvs) && isUpdatable upd_flag && arity <= mAX_SPEC_AP_SIZE @@ -370,17 +366,15 @@ mkRhsClosure bndr cc bi srt lf_info = mkApLFInfo bndr upd_flag arity -- the payload has to be in the correct order, hence we can't -- just use the fvs. - payload = StgVarArg fun_id : args - arity = length fvs + payload = StgVarArg fun_id : args + arity = length fvs \end{code} The default case ~~~~~~~~~~~~~~~~ \begin{code} mkRhsClosure bndr cc bi srt fvs upd_flag args body - = cgRhsClosure bndr cc bi srt fvs args body lf_info - where - lf_info = mkClosureLFInfo bndr NotTopLevel fvs upd_flag args + = cgRhsClosure bndr cc bi srt fvs upd_flag args body \end{code} @@ -392,20 +386,19 @@ mkRhsClosure bndr cc bi srt fvs upd_flag args body \begin{code} cgLetNoEscapeBindings live_in_rhss rhs_eob_info maybe_cc_slot (StgNonRec binder rhs) - = cgLetNoEscapeRhs live_in_rhss rhs_eob_info maybe_cc_slot - NonRecursive binder rhs - `thenFC` \ (binder, info) -> - addBindC binder info + = do { (binder,info) <- cgLetNoEscapeRhs live_in_rhss rhs_eob_info + maybe_cc_slot + NonRecursive binder rhs + ; addBindC binder info } cgLetNoEscapeBindings live_in_rhss rhs_eob_info maybe_cc_slot (StgRec pairs) - = fixC (\ new_bindings -> - addBindsC new_bindings `thenC` - listFCs [ cgLetNoEscapeRhs full_live_in_rhss + = do { new_bindings <- fixC (\ new_bindings -> do + { addBindsC new_bindings + ; listFCs [ cgLetNoEscapeRhs full_live_in_rhss rhs_eob_info maybe_cc_slot Recursive b e - | (b,e) <- pairs ] - ) `thenFC` \ new_bindings -> + | (b,e) <- pairs ] }) - addBindsC new_bindings + ; addBindsC new_bindings } where -- We add the binders to the live-in-rhss set so that we don't -- delete the bindings for the binder from the environment! @@ -443,41 +436,15 @@ cgLetNoEscapeRhs full_live_in_rhss rhs_eob_info maybe_cc_slot rec binder Little helper for primitives that return unboxed tuples. - \begin{code} -primRetUnboxedTuple :: StgOp -> [StgArg] -> Type -> Code -primRetUnboxedTuple op args res_ty - = getArgAmodes args `thenFC` \ arg_amodes1 -> - {- - For a foreign call, we might need to fiddle with some of the args: - for example, when passing a ByteArray#, we pass a ptr to the goods - rather than the heap object. - -} - let - arg_amodes - | StgFCallOp{} <- op = zipWith shimFCallArg args arg_amodes1 - | otherwise = arg_amodes1 - in - {- - put all the arguments in temporaries so they don't get stomped when - we push the return address. - -} - let - n_args = length args - arg_uniqs = map mkBuiltinUnique [0 .. n_args-1] - arg_reps = map getAmodeRep arg_amodes - arg_temps = zipWith CTemp arg_uniqs arg_reps - in - absC (mkAbstractCs (zipWith CAssign arg_temps arg_amodes)) `thenC` - {- - allocate some temporaries for the return values. - -} - let - ty_args = tyConAppArgs (repType res_ty) - prim_reps = map typePrimRep ty_args - temp_uniqs = map mkBuiltinUnique [ n_args .. n_args + length ty_args - 1] - temp_amodes = zipWith CTemp temp_uniqs prim_reps - in - ccallReturnUnboxedTuple temp_amodes - (absC (COpStmt temp_amodes op arg_temps [])) +newUnboxedTupleRegs :: Type -> FCode ([CgRep], [CmmReg], [MachHint]) +newUnboxedTupleRegs res_ty = + let + ty_args = tyConAppArgs (repType res_ty) + (reps,hints) = unzip [ (rep, typeHint ty) | ty <- ty_args, + let rep = typeCgRep ty, + nonVoidArg rep ] + in do + regs <- mapM (newTemp . argMachRep) reps + return (reps,regs,hints) \end{code}