%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[CgUpdate]{Manipulating update frames}
\begin{code}
-#include "HsVersions.h"
-
module CgUpdate ( pushUpdateFrame ) where
-IMP_Ubiq(){-uitous-}
+#include "HsVersions.h"
import CgMonad
import AbsCSyn
-import CgCompInfo ( sTD_UF_SIZE, sCC_STD_UF_SIZE )
-import CgStackery ( allocUpdateFrame )
-import CmdLineOpts ( opt_SccProfilingOn )
-import Util ( assertPanic )
+import CgStackery ( allocStackTop, updateFrameSize, setStackFrame )
+import CgUsages ( getVirtSp )
+import Panic ( assertPanic )
\end{code}
to reflect the frame pushed.
\begin{code}
-pushUpdateFrame :: CAddrMode -> CAddrMode -> Code -> Code
+pushUpdateFrame :: CAddrMode -> Code -> Code
-pushUpdateFrame updatee vector code
- = let
- profiling_on = opt_SccProfilingOn
-
- -- frame_size *includes* the return address
- frame_size = if profiling_on
- then sCC_STD_UF_SIZE
- else sTD_UF_SIZE
- in
+pushUpdateFrame updatee code
+ =
+#ifdef DEBUG
getEndOfBlockInfo `thenFC` \ eob_info ->
- ASSERT(case eob_info of { EndOfBlockInfo _ _ InRetReg -> True; _ -> False})
- allocUpdateFrame frame_size vector (\ _ ->
+ ASSERT(case eob_info of { EndOfBlockInfo _ (OnStack _) -> True;
+ _ -> False})
+#endif
+
+ allocStackTop updateFrameSize `thenFC` \ _ ->
+ getVirtSp `thenFC` \ vsp ->
+
+ setStackFrame vsp `thenC`
+
+ setEndOfBlockInfo (EndOfBlockInfo vsp UpdateCode) (
-- Emit the push macro
- absC (CMacroStmt PUSH_STD_UPD_FRAME [
+ absC (CMacroStmt PUSH_UPD_FRAME [
updatee,
- int_CLit0, -- Known to be zero because we have just
- int_CLit0 -- entered a thunk
+ int_CLit0 -- we just entered a closure, so must be zero
])
`thenC` code
)
int_CLit0 = mkIntCLit 0 -- out here to avoid pushUpdateFrame CAF (sigh)
-
-{- ---------------------
- What actually happens is something like this; but it got macro-ised
-
- = pushOnBStack (CReg CurCostCentre) `thenFC` \ _ ->
- pushOnBStack (CReg SuA) `thenFC` \ _ ->
- pushOnBStack (CReg SuB) `thenFC` \ _ ->
- pushOnBStack updatee `thenFC` \ _ ->
- pushOnBStack (CLabel sTD_UPD_RET_VEC_LABEL CodePtrRep) `thenFC` \ _ ->
-
- -- MAKE SuA, SuB POINT TO TOP OF A,B STACKS
- -- Remember, SpB hasn't yet been incremented to account for the
- -- 4-word update frame which has been pushed.
- -- This code seems crude, but effective...
- absC (AbsCStmts (CAssign (CReg SuA) (CReg SpA))
- (CAssign (CReg SuB) (CAddr (SpBRel 0 4))))
--------------------------- -}
\end{code}