%
% (c) The GRASP/AQUA Project, Glasgow University, 1993-1998
%
-% $Id: CgLetNoEscape.lhs,v 1.20 2003/05/14 09:13:56 simonmar Exp $
+% $Id: CgLetNoEscape.lhs,v 1.21 2003/07/02 13:12:37 simonpj Exp $
%
%********************************************************
%* *
import CgMonad
import AbsCSyn
-import CgBindery ( letNoEscapeIdInfo, bindArgsToRegs,
- bindNewToStack, buildContLivenessMask, CgIdInfo,
- nukeDeadBindings
- )
+import CgBindery ( CgIdInfo, letNoEscapeIdInfo, nukeDeadBindings )
+import CgCase ( mkRetDirectTarget, restoreCurrentCostCentre )
+import CgCon ( bindUnboxedTupleComponents )
import CgHeapery ( unbxTupleHeapCheck )
-import CgRetConv ( assignRegs )
-import CgStackery ( mkVirtStkOffsets,
- allocStackTop, deAllocStackTop, freeStackSlots )
-import CgUsages ( setRealAndVirtualSp, getRealSp, getSpRelOffset )
+import CgStackery ( allocStackTop, deAllocStackTop )
+import CgUsages ( getSpRelOffset )
import CLabel ( mkReturnInfoLabel )
import ClosureInfo ( mkLFLetNoEscape )
import CostCentre ( CostCentreStack )
-import Name ( getName )
-import Id ( Id, idPrimRep, idName )
+import Id ( Id )
import Var ( idUnique )
-import PrimRep ( PrimRep(..), retPrimRepSize, isFollowableRep )
+import PrimRep ( PrimRep(..), retPrimRepSize )
import BasicTypes ( RecFlag(..) )
-import Unique ( Unique )
-import Util ( splitAtList )
-
-import List ( partition )
\end{code}
%************************************************************************
-- ToDo: deal with the cost-centre issues
cgLetNoEscapeClosure
- binder cc binder_info srt full_live_in_rhss
+ bndr cc binder_info srt full_live_in_rhss
rhs_eob_info cc_slot rec args body
= let
arity = length args
lf_info = mkLFLetNoEscape arity
- uniq = idUnique binder
in
-- saveVolatileVarsAndRegs done earlier in cgExpr.
nukeDeadBindings full_live_in_rhss)
(deAllocStackTop retPrimRepSize `thenFC` \_ ->
- buildContLivenessMask (getName binder) `thenFC` \ liveness ->
- forkAbsC (cgLetNoEscapeBody binder cc args body uniq)
- `thenFC` \ code ->
- getSRTInfo (idName binder) srt `thenFC` \ srt_info ->
- absC (CRetDirect uniq code srt_info liveness)
- `thenC` returnFC ())
- `thenFC` \ (vSp, _) ->
-
- returnFC (binder, letNoEscapeIdInfo binder vSp lf_info)
+ forkAbsC (
+-- TEMP omit for line-by-line compatibility
+-- restoreCurrentCostCentre cc_slot `thenC`
+ cgLetNoEscapeBody bndr cc args body
+ ) `thenFC` \ abs_c ->
+ mkRetDirectTarget bndr abs_c srt
+ -- Ignore the label that comes back from
+ -- mkRetDirectTarget. It must be conjured up elswhere
+ ) `thenFC` \ (vSp, _) ->
+
+ returnFC (bndr, letNoEscapeIdInfo bndr vSp lf_info)
\end{code}
\begin{code}
-cgLetNoEscapeBody :: Id
+cgLetNoEscapeBody :: Id -- Name of the joint point
-> CostCentreStack
-> [Id] -- Args
-> StgExpr -- Body
- -> Unique -- Unique for entry label
-> Code
-cgLetNoEscapeBody binder cc all_args body uniq
- =
- -- this is where the stack frame lives:
- getRealSp `thenFC` \sp ->
-
- -- This is very much like bindUnboxedTupleComponents (ToDo)
- let
- arg_kinds = map idPrimRep all_args
- (arg_regs, _) = assignRegs [{-nothing live-}] arg_kinds
- (reg_args, stk_args) = splitAtList arg_regs all_args
-
- -- separate the rest of the args into pointers and non-pointers
- ( ptr_args, nptr_args ) =
- partition (isFollowableRep . idPrimRep) stk_args
-
- (ptr_sp, ptr_offsets) = mkVirtStkOffsets sp idPrimRep ptr_args
- (nptr_sp, nptr_offsets) = mkVirtStkOffsets ptr_sp idPrimRep nptr_args
-
- ptrs = ptr_sp - sp
- nptrs = nptr_sp - ptr_sp
- in
-
- -- Bind args to appropriate regs/stk locns
- bindArgsToRegs reg_args arg_regs `thenC`
- mapCs bindNewToStack ptr_offsets `thenC`
- mapCs bindNewToStack nptr_offsets `thenC`
-
- setRealAndVirtualSp nptr_sp `thenC`
-
- -- free up the stack slots containing the return address
- -- (frame header itbl). c.f. CgCase.cgUnboxedTupleAlt.
- freeStackSlots [sp] `thenC`
+cgLetNoEscapeBody bndr cc all_args body
+ = bindUnboxedTupleComponents all_args `thenFC` \ (arg_regs, ptrs, nptrs, ret_slot) ->
-- Enter the closures cc, if required
--enterCostCentreCode closure_info cc IsFunction `thenC`
- -- fill in the frame header only if we fail a heap check:
- -- otherwise it isn't needed.
- getSpRelOffset sp `thenFC` \sp_rel ->
- let lbl = mkReturnInfoLabel uniq
+ -- The "return address" slot doesn't have a return address in it;
+ -- but the heap-check needs it filled in if the heap-check fails.
+ -- So we pass code to fill it in to the heap-check macro
+ getSpRelOffset ret_slot `thenFC` \ sp_rel ->
+ let lbl = mkReturnInfoLabel (idUnique bndr)
frame_hdr_asst = CAssign (CVal sp_rel RetRep) (CLbl lbl RetRep)
in
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