%
% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
-% $Id: CgExpr.lhs,v 1.20 1999/03/11 11:32:26 simonm Exp $
+% $Id: CgExpr.lhs,v 1.28 1999/06/24 13:04:18 simonmar Exp $
%
%********************************************************
%* *
import CLabel ( mkClosureTblLabel )
import SMRep ( fixedHdrSize )
-import CgBindery ( getArgAmodes, CgIdInfo, nukeDeadBindings )
+import CgBindery ( getArgAmodes, getArgAmode, CgIdInfo,
+ nukeDeadBindings, addBindC, addBindsC )
import CgCase ( cgCase, saveVolatileVarsAndRegs,
- restoreCurrentCostCentre,
- splitTyConAppThroughNewTypes )
+ restoreCurrentCostCentre )
import CgClosure ( cgRhsClosure, cgStdRhsClosure )
import CgCon ( buildDynCon, cgReturnDataCon )
import CgLetNoEscape ( cgLetNoEscapeClosure )
)
import ClosureInfo ( mkClosureLFInfo, mkSelectorLFInfo,
mkApLFInfo, layOutDynCon )
-import CostCentre ( sccAbleCostCentre, isDictCC, isSccCountCostCentre )
+import CostCentre ( sccAbleCostCentre, isSccCountCostCentre )
import Id ( idPrimRep, idType, Id )
import VarSet
import DataCon ( DataCon, dataConTyCon )
import PrimRep ( getPrimRepSize, PrimRep(..), isFollowableRep )
import TyCon ( maybeTyConSingleCon,
isUnboxedTupleTyCon, isEnumerationTyCon )
-import Type ( Type, typePrimRep )
+import Type ( Type, typePrimRep, splitTyConApp_maybe, splitRepTyConApp_maybe )
import Maybes ( assocMaybe, maybeToBool )
import Unique ( mkBuiltinUnique )
import BasicTypes ( TopLevelFlag(..), RecFlag(..) )
A _ccall_GC_ is treated as an out-of-line primop for the case
expression code, because we want a proper stack frame on the stack
when we perform it. When we get here, however, we need to actually
-perform the call, so we treat it an an inline primop.
+perform the call, so we treat it as an inline primop.
\begin{code}
cgExpr (StgCon (PrimOp op@(CCallOp _ _ may_gc@True _)) args res_ty)
= primRetUnboxedTuple op args res_ty
+-- tagToEnum# is special: we need to pull the constructor out of the table,
+-- and perform an appropriate return.
+
+cgExpr (StgCon (PrimOp 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)
+ where
+ dyn_tag = CTemp (mkBuiltinUnique 0) IntRep
+ (Just (tycon,_)) = splitTyConApp_maybe res_ty
+
+
cgExpr x@(StgCon (PrimOp op) args res_ty)
| primOpOutOfLine op = tailCallPrimOp op args
| otherwise
ReturnsAlg tycon
| isUnboxedTupleTyCon tycon -> primRetUnboxedTuple op args res_ty
-
| isEnumerationTyCon tycon ->
performReturn
(COpStmt [dyn_tag] op arg_amodes [{-no vol_regs-}])
-- about to return anyway.
dyn_tag = CTemp (mkBuiltinUnique 0) IntRep
- closure_lbl = CTableEntry
+ closure_lbl = CVal (CIndex
(CLbl (mkClosureTblLabel tycon) PtrRep)
- dyn_tag PtrRep
+ dyn_tag PtrRep) PtrRep
\end{code}
cgExpr (StgSCC cc expr)
= ASSERT(sccAbleCostCentre cc)
costCentresC
- (if isDictCC cc then SLIT("SET_DICT_CCC") else SLIT("SET_CCC"))
+ SLIT("SET_CCC")
[mkCCostCentre cc, mkIntCLit (if isSccCountCostCentre cc then 1 else 0)]
`thenC`
cgExpr expr
allocate some temporaries for the return values.
-}
let
- (tc,ty_args) = case splitTyConAppThroughNewTypes res_ty of
+ (tc,ty_args) = case splitRepTyConApp_maybe res_ty of
Nothing -> pprPanic "primRetUnboxedTuple" (ppr res_ty)
Just pr -> pr
prim_reps = map typePrimRep ty_args