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|
(* c-call-gen-fn.sml
*
* Generate MLRISC code for moving arguments to and from machine locations.
*)
functor CCallGenFn (
structure T : MLTREE
structure C : CELLS
(* given an offset constant, return an expression that gives an offset from
* the run-time stack pointer
*)
val offSp : T.I.machine_int -> T.rexp
(* we assume that the address width is the same *)
val wordTy : int
(* extract least significant bits *)
val lobits : {nBits : int, width : int, e : T.rexp} -> T.rexp
(* sign extend the expression *)
val sx : {fromWidth : int, toWidth : int, e : T.rexp} -> T.rexp
(* float to float conversion (change width) *)
val f2f : {fromWidth : int, toWidth : int, e : T.fexp} -> T.fexp
structure SA : STAGED_ALLOCATION
where type reg_id = T.reg
where type loc_kind = CLocKind.loc_kind
) : C_CALL_GEN = struct
structure K = CLocKind
structure T = T
structure C = C
structure SA = SA
fun concatMap f ls = List.concat(List.map f ls)
datatype c_arg
= ARG of T.rexp
(* rexp specifies integer or pointer; if the
* corresponding parameter is a C struct, then
* this argument is the address of the struct.
*)
| FARG of T.fexp
(* fexp specifies floating-point argument *)
fun copyToReg (mty, r, e) = let
val tmp = C.newReg ()
in
[T.COPY (mty, [r], [tmp]), T.MV (mty, tmp, e)]
end
fun copyToFReg (mty, r, e) = let
val tmp = C.newFreg ()
in
[T.FCOPY (mty, [r], [tmp]), T.FMV (mty, tmp, e)]
end
val stack = T.Region.stack
fun litInt i = T.I.fromInt(wordTy, i)
val lit = T.LI o litInt
val offSp = offSp o litInt
(* returns any general-purpose register IDs used in a machine location *)
fun gprsOfLoc (SA.REG (_, K.GPR, r)) = [r]
| gprsOfLoc (SA.COMBINE (l1, l2)) = gprsOfLoc l1 @ gprsOfLoc l2
| gprsOfLoc (SA.NARROW (l, _, K.GPR)) = gprsOfLoc l
| gprsOfLoc _ = []
(* returns any floating-point register IDs used in a machine location *)
fun fprsOfLoc (SA.REG (w, K.FPR, r)) = [(w, r)]
| fprsOfLoc (SA.COMBINE (l1, l2)) = fprsOfLoc l1 @ fprsOfLoc l2
| fprsOfLoc (SA.NARROW (l, _, K.FPR)) = fprsOfLoc l
| fprsOfLoc _ = []
(* eliminate redundant narrows, i.e., narrow.32(r1.32) == r1.32 *)
fun elimNarrow (loc as SA.NARROW(SA.REG(wr, kr, r), wn, kn)) =
if kr = kn andalso wr = wn
then SA.REG(wr, kr, r)
else loc
| elimNarrow (loc as SA.NARROW(SA.BLOCK_OFFSET(wb, kb, offset), wn, kn)) =
if kb = kn andalso wb = wn
then SA.BLOCK_OFFSET(wb, kb, offset)
else loc
| elimNarrow (SA.COMBINE(l1, l2)) = SA.COMBINE(elimNarrow l1, elimNarrow l2)
| elimNarrow loc = loc
(* write a C argument (non aggregate) to a machine location
* - arg is the argument data
* - off is an offset into the argument data
* - loc is the machine location
* - stms is the accumulator of machine instructions
*)
fun writeLoc arg (off, loc, stms) = (
case (arg, loc)
of (ARG (e as T.REG _), SA.BLOCK_OFFSET(w, (K.GPR | K.STK), offset)) =>
(* register to stack (gpr) *)
T.STORE(wordTy, offSp offset, e, stack) :: stms
| (ARG (e as T.REG _), SA.NARROW(SA.BLOCK_OFFSET(w, (K.GPR | K.STK), offset), w', (K.GPR | K.STK))) =>
(* register to stack with width conversion (gpr) *)
T.STORE(w, offSp offset, sx{fromWidth=w', toWidth=w, e=e}, stack) :: stms
| (ARG (T.LOAD (ty, e, rgn)), SA.REG (w, K.GPR, r)) =>
(* memory to register (gpr) *)
copyToReg(w, r, T.LOAD (ty, T.ADD(wordTy, e, off), rgn)) @ stms
| (ARG (T.LOAD (ty, e, rgn)), SA.NARROW(SA.REG (w, K.GPR, r), w', K.GPR)) =>
(* memory to register with conversion (gpr) *)
copyToReg(w, r, sx{fromWidth=w', toWidth=w, e=T.LOAD (w', T.ADD(wordTy, e, off), rgn)}) @ stms
| (ARG e, SA.REG (w, K.GPR, r)) =>
(* expression to register *)
copyToReg(w, r, e) @ stms
| (ARG e, SA.NARROW (SA.REG(w, K.GPR, r), w', K.GPR)) =>
(* expression to register with conversion *)
copyToReg(w, r, sx{fromWidth=w', toWidth=w, e=e}) @ stms
| (ARG (T.LOAD (ty, e, rgn)), SA.BLOCK_OFFSET(w, (K.GPR | K.STK), offset)) => let
(* memory to stack (gpr) *)
val tmp = C.newReg ()
in
T.STORE (ty, offSp offset, T.REG (ty, tmp), stack) ::
T.MV (ty, tmp, T.LOAD (ty, T.ADD(wordTy, e, off), rgn)) :: stms
end
| (ARG (T.LOAD (ty, e, rgn)), SA.NARROW(SA.BLOCK_OFFSET(w, (K.GPR | K.STK), offset), w', K.GPR)) => let
(* memory to stack with conversion (gpr) *)
val tmp = C.newReg ()
in
T.STORE (w, offSp offset, T.REG (w, tmp), stack) ::
T.MV (w, tmp, sx{fromWidth=w', toWidth=w, e=T.LOAD (w', T.ADD(wordTy, e, off), rgn)}) :: stms
end
| (ARG e, SA.BLOCK_OFFSET(w, (K.GPR | K.STK), offset)) => let
(* expression to stack (gpr) *)
val tmp = C.newReg ()
in
T.STORE (w, offSp offset, T.REG (w, tmp), stack) :: T.MV (w, tmp, e) :: stms
end
| (ARG e, SA.NARROW(SA.BLOCK_OFFSET(w, (K.GPR | K.STK), offset), w', K.GPR)) => let
(* expression to stack with conversion (gpr) *)
val tmp = C.newReg ()
in
T.STORE (w, offSp offset, T.REG (w, tmp), stack) :: T.MV (w, tmp, sx{fromWidth=w', toWidth=w, e=e}) :: stms
end
| (FARG (e as T.FREG _), SA.BLOCK_OFFSET(w, (K.FPR | K.FSTK), offset)) =>
(* register to stack (fpr) *)
T.FSTORE (w, offSp offset, e, stack) :: stms
| (FARG e, SA.REG(w, K.FPR, r)) =>
(* expression to register (fpr) *)
copyToFReg(w, r, e) @ stms
| (FARG e, SA.NARROW(SA.REG(w, K.FPR, r), w', K.FPR)) =>
(* expression to register with conversion (fpr) *)
copyToFReg(w', r, f2f{fromWidth=w, toWidth=w', e=e}) @ stms
| (ARG (T.LOAD (ty, e, rgn)), SA.REG(w, K.FPR, r)) =>
(* memory to register (fpr) *)
copyToFReg(w, r, T.FLOAD (ty, T.ADD(wordTy, e, off), rgn)) @ stms
| (ARG (T.LOAD (ty, e, rgn)), SA.BLOCK_OFFSET(w, (K.FPR | K.FSTK), offset)) => let
(* memory to stack (fpr) *)
val tmp = C.newFreg ()
in
T.FSTORE (w, offSp offset, T.FREG (w, tmp), stack) ::
T.FMV (w, tmp, T.FLOAD (ty, T.ADD(wordTy, e, off), rgn)) :: stms
end
| (ARG (T.LOAD (ty, e, rgn)), SA.NARROW(SA.BLOCK_OFFSET(w, (K.FPR | K.FSTK), offset), w', K.FPR)) => let
(* memory to stack with conversion (fpr) *)
val tmp = C.newFreg ()
in
T.FSTORE (w, offSp offset, T.FREG (w, tmp), stack) ::
T.FMV (w', tmp, f2f{fromWidth=w, toWidth=w', e=T.FLOAD (w', T.ADD(wordTy, e, off), rgn)}) :: stms
end
| (FARG (T.FLOAD (ty, e, rgn)), SA.BLOCK_OFFSET(w, (K.FPR | K.FSTK), offset)) => let
(* memory to stack (fpr) *)
val tmp = C.newFreg ()
in
T.FSTORE (w, offSp offset, T.FREG (w, tmp), stack) ::
T.FMV (w, tmp, T.FLOAD (w, T.ADD(wordTy, e, off), rgn)) :: stms
end
| (FARG (T.FLOAD (ty, e, rgn)), SA.NARROW(SA.BLOCK_OFFSET(w, (K.FPR | K.FSTK), offset), w', K.FPR)) => let
(* memory to stack with conversion (fpr) *)
val tmp = C.newFreg ()
in
T.FSTORE (w, offSp offset, T.FREG (w, tmp), stack) ::
T.FMV (w', tmp, f2f{fromWidth=w, toWidth=w', e=T.FLOAD (w, T.ADD(wordTy, e, off), rgn)}) :: stms
end
| (FARG e, SA.BLOCK_OFFSET(w, (K.FPR | K.FSTK), offset)) => let
(* expression to stack (fpr) *)
val tmp = C.newFreg ()
in
T.FSTORE (w, offSp offset, T.FREG (w, tmp), stack) :: T.FMV (w, tmp, e) :: stms
end
| (FARG e, SA.NARROW(SA.BLOCK_OFFSET(w, (K.FPR | K.FSTK), offset), w', K.FPR)) => let
(* expression to stack (fpr) *)
val tmp = C.newFreg ()
in
T.FSTORE (w', offSp offset, f2f{fromWidth=w, toWidth=w', e=T.FREG (w, tmp)}, stack) :: T.FMV (w, tmp, e) :: stms
end
| (FARG _, SA.COMBINE _) =>
raise Fail ""
| _ => raise Fail "invalid arg / loc pair"
(* end case *))
(* write a C argument (possibly an aggregate) to some parameter locations *)
fun writeLocs' (arg, locs, stms) = let
val locs = List.map elimNarrow locs
(* offsets of the members of the struct *)
val membOffs = List.tabulate(List.length locs, fn i => lit(i*8))
in
ListPair.foldl (writeLoc arg) stms (membOffs, locs)
end
(* write C arguments to parameter locations; also return any used GPRs and FPRs *)
fun writeLocs (args, argLocs) = let
val gprs = concatMap gprsOfLoc (List.concat argLocs)
val fprs = concatMap fprsOfLoc (List.concat argLocs)
val instrs = ListPair.foldl writeLocs' [] (args, argLocs)
in
(List.rev instrs, gprs, fprs)
end
(* read from a machine location *)
fun readLoc (loc, (resultRegs, copyResult)) = (
case elimNarrow loc
of SA.REG(w, K.GPR, r) => let
(* register (gpr) *)
val tmpR = C.newReg()
in
(T.GPR(T.REG(w, tmpR)) :: resultRegs, T.COPY(w, [tmpR], [r]) :: copyResult)
end
| SA.NARROW(loc, w', K.GPR) => let
(* conversion (gpr) *)
val ([resultReg as T.GPR(T.REG(_, tmp))], copyResult') = readLoc(loc, ([], []))
val w = SA.width loc
in
(T.GPR(T.REG(w', tmp)) :: resultRegs,
T.MV(w, tmp, lobits{nBits=w', width=w, e=T.REG (w, tmp)}) :: copyResult' @ copyResult)
end
| SA.REG(w, K.FPR, r) => let
val resReg = C.newFreg()
in
(T.FPR(T.FREG(w, resReg)) :: resultRegs, T.FCOPY(w, [resReg], [r]) :: copyResult)
end
| SA.NARROW(loc, w', K.FPR) => let
(* conversion (fpr) *)
val ([resultReg as T.FPR(T.FREG(_, tmp))], copyResult') = readLoc(loc, ([], []))
val w = SA.width loc
in
(T.FPR(T.FREG(w', tmp)) :: resultRegs,
T.FMV(w', tmp, f2f{fromWidth=w, toWidth=w', e=T.FREG(w', tmp)}) :: copyResult' @ copyResult)
end
| SA.COMBINE (l1, l2) => (
case (readLoc (l1, ([], [])), readLoc (l2, ([], [])))
of ( ([T.GPR e1], instrs1), ([T.GPR e2], instrs2) ) => let
val w = SA.width loc
val w' = SA.width l2
val tmp = C.newReg()
in
(T.GPR(T.REG(w, tmp)) :: resultRegs,
T.MV(w, tmp, T.ADD(w, T.SLL(w, lit w', e1), e2)) ::
instrs1 @ instrs2 @ copyResult)
end
(* end case *))
| _ => raise Fail "bogus read location"
(* end case *))
(* read from some machine locations *)
fun readLocs locs = let
val (resultRegs, copyResult) = List.foldl readLoc ([], []) locs
in
(List.rev resultRegs, List.rev copyResult)
end
end (* CCallGenFn *)
|
