%
% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
-% $Id: CgTailCall.lhs,v 1.24 2000/03/23 17:45:19 simonpj Exp $
+% $Id: CgTailCall.lhs,v 1.31 2001/10/25 05:07:32 sof Exp $
%
%********************************************************
%* *
import AbsCSyn
import PprAbsC ( pprAmode )
-import AbsCUtils ( mkAbstractCs, mkAbsCStmts, getAmodeRep )
+import AbsCUtils ( mkAbstractCs, getAmodeRep )
import CgBindery ( getArgAmodes, getCAddrMode, getCAddrModeAndInfo )
import CgRetConv ( dataReturnConvPrim,
ctrlReturnConvAlg, CtrlReturnConvention(..),
import CgStackery ( mkTaggedStkAmodes, adjustStackHW )
import CgUsages ( getSpRelOffset, adjustSpAndHp )
import CgUpdate ( pushSeqFrame )
-import CLabel ( mkUpdInfoLabel, mkRtsPrimOpLabel,
- mkBlackHoleInfoTableLabel )
+import CLabel ( mkUpdInfoLabel, mkRtsPrimOpLabel )
import ClosureInfo ( nodeMustPointToIt,
- getEntryConvention, EntryConvention(..),
- LambdaFormInfo
+ getEntryConvention, EntryConvention(..), LambdaFormInfo
)
import CmdLineOpts ( opt_DoSemiTagging )
import Id ( Id, idType, idName )
import DataCon ( DataCon, dataConTyCon, dataConTag, fIRST_TAG )
-import Literal ( mkMachInt )
-import Maybes ( assocMaybe, maybeToBool )
+import Maybes ( maybeToBool )
import PrimRep ( PrimRep(..) )
-import StgSyn ( StgArg, GenStgArg(..) )
+import StgSyn ( StgArg )
import Type ( isUnLiftedType )
import TyCon ( TyCon )
import PrimOp ( PrimOp )
-import Util ( zipWithEqual )
-import Unique ( mkPseudoUnique1 )
+import Util ( zipWithEqual, splitAtList )
+import ListSetOps ( assocMaybe )
import Outputable
import Panic ( panic, assertPanic )
\end{code}
\end{code}
\begin{code}
-performTailCall :: Id -- Function
- -> [StgArg] -- Args
- -> Code
-
+performTailCall :: Id -> [StgArg] -> Code
performTailCall fun args
- = -- Get all the info we have about the function and args and go on to
- -- the business end
- getCAddrModeAndInfo fun `thenFC` \ (fun_amode, lf_info) ->
- getArgAmodes args `thenFC` \ arg_amodes ->
-
- tailCallFun
- fun fun_amode lf_info arg_amodes
- AbsCNop {- No pending assignments -}
-
-
--- generating code for a tail call to a function (or closure)
-
-tailCallFun :: Id -> CAddrMode -- Function and its amode
- -> LambdaFormInfo -- Info about the function
- -> [CAddrMode] -- Arguments
+ = getCAddrModeAndInfo fun `thenFC` \ (fun', fun_amode, lf_info) ->
+ getArgAmodes args `thenFC` \ arg_amodes ->
+ tailCallFun fun' fun_amode lf_info arg_amodes AbsCNop{- No pending assignments -}
+\end{code}
- -> AbstractC -- Pending simultaneous assignments
- -- *** GUARANTEED to contain only stack
- -- assignments.
+Generating code for a tail call to a function (or closure)
+\begin{code}
+tailCallFun
+ :: Id -- Function
+ -> CAddrMode
+ -> LambdaFormInfo
+ -> [CAddrMode] -- Arguments
+ -> AbstractC -- Pending simultaneous assignments
+ -- *** GUARANTEED to contain only stack
+ -- assignments.
-- In ptic, we don't need to look in
-- here to discover all live regs
-
- -> Code
+ -> Code
tailCallFun fun fun_amode lf_info arg_amodes pending_assts
= nodeMustPointToIt lf_info `thenFC` \ node_points ->
+ -- we use the name of fun', the Id from the environment, rather than
+ -- fun from the STG tree, in case it is a top-level name that we globalised
+ -- (see cgTopRhsClosure).
getEntryConvention (idName fun) lf_info
(map getAmodeRep arg_amodes) `thenFC` \ entry_conv ->
let
= getEndOfBlockInfo `thenFC` \ eob@(EndOfBlockInfo args_sp sequel) ->
let
- no_of_args = length arg_amodes
-
- (reg_arg_amodes, stk_arg_amodes) = splitAt (length arg_regs) arg_amodes
+ (reg_arg_amodes, stk_arg_amodes) = splitAtList arg_regs arg_amodes
-- We get some stk_arg_amodes if (a) no regs, or
-- (b) args beyond arity
splitAt arity stk_arg_amodes
-- eager blackholing, at the end of the basic block.
- node_save = CTemp (mkPseudoUnique1 2) DataPtrRep
(r1_tmp_asst, bh_asst)
= case sequel of
#if 0
CAssign (CVal (CIndex node_save (mkIntCLit 0) PtrRep)
PtrRep)
(CLbl mkBlackHoleInfoTableLabel DataPtrRep))
+ where
+ node_save = CTemp (mkPseudoUnique1 2) DataPtrRep
#endif
_ -> (AbsCNop, AbsCNop)
in