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|
(* mdl-gen-cells.sml
*
* COPYRIGHT (c) 2016 The Fellowship of SML/NJ (http://www.smlnj.org)
* All rights reserved.
*
* Generate the <arch>Cells structure.
* This structure contains various information about the register
* properties of the architecture.
*)
functor MDLGenCells(Comp : MDL_COMPILE) : MDL_GEN_MODULE =
struct
structure Ast = Comp.Ast
structure Comp = Comp
structure R = Comp.Rewriter
open Ast Comp.Util
val NO = R.noRewrite
val SZty = IDty(IDENT([],"CellsBasis.sz"))
val REGISTER_IDty = IDty(IDENT([],"CellsBasis.register_id"))
val showFunTy = FUNty(REGISTER_IDty, STRINGty)
val showWithSizeFunTy = FUNty(TUPLEty[REGISTER_IDty,SZty], STRINGty)
fun gen md =
let (* name of the structure *)
val strName = Comp.strname md "Cells"
val sigName = Comp.signame md "CELLS"
(* all cell kinds *)
val cellKinds = Comp.cells md
(* Process *)
fun process([], r) = r
| process(CELLdecl{id, from, to, count, ...}::ds, r) =
let val count = case count of NONE => 0 | SOME c => c
in from := r;
to := r + count - 1;
process(ds, r+count)
end
val firstPseudo = process(cellKinds, 0)
(* all cell kind names *)
val cellKindNames = map (fn CELLdecl{id, ...} => id) cellKinds
val allCellKindNames = cellKindNames
(* cellkinds that has to be put into the cellset *)
(* val cellSets = Comp.cellSets md
val cellSets' = Comp.cellSetsAliases md
val cellSetNames = map (fn CELLdecl{id, ...} => id) cellSets
*)
val clientDefinedCellKinds =
List.filter (fn CELLdecl{id, ...} =>
not(MLRiscDefs.isPredefinedCellKind id)) cellKinds
(* locations *)
val locations = Comp.locations md
(* Functions showXXX *)
val showFunSig =
VALSIGdecl(map (fn k => "show"^k) cellKindNames,showFunTy)
val showWithSizeFunSig =
VALSIGdecl(map (fn k => "show"^k^"WithSize")
cellKindNames,showWithSizeFunTy)
val showWithSizeFuns =
let fun shift(from, to) e =
if !from = 0 then e
else LET([VAL("r",
IFexp(APP("<=",TUPLEexp[ID "r",INTexp(!to)]),
APP("-",TUPLEexp[ID "r",INTexp(!from)]),
ID "r"))],e)
in FUNdecl(
map (fn CELLdecl{id, from, to, print, ...} =>
FUNbind("show"^id^"WithSize",
[CLAUSE([TUPLEpat[IDpat "r",IDpat "ty"]],
NONE,
(APPexp(print, TUPLEexp[ID "r",ID "ty"])))]))
cellKinds)
end
val showFuns =
SEQdecl(map (fn CELLdecl{id, from, to, print, bits, ...} =>
FUN("show"^id,IDpat "r",
APP("show"^id^"WithSize",TUPLEexp[ID "r",INTexp bits])))
cellKinds)
(* Functions addXXX *)
val addFunTy = FUNty(TUPLEty[REGISTERty,CELLSETty],CELLSETty)
val addFunSig = VALSIGdecl(map (fn s => "add"^s)
cellKindNames, addFunTy)
val addFun = VALdecl
(map (fn k => VALbind(IDpat("add"^k),
IDexp(IDENT(["CellSet"],"add"))))
cellKindNames)
(* Client defined cellkinds *)
val clientDefinedCellKindsSig =
VALSIGdecl(map (fn CELLdecl{id, ...} => id) clientDefinedCellKinds,
IDty(IDENT([],"CellsBasis.cellkind")))
fun createCellKind(CELLdecl{id, nickname, ...}) =
VALbind(IDpat id,
APPexp(IDexp(IDENT(["CellsBasis"],"newCellKind")),
RECORDexp[("name",STRINGexp id),
("nickname",STRINGexp nickname)]))
val clientDefinedCellKindsDecl =
VALdecl(map createCellKind clientDefinedCellKinds)
val None = ID "NONE"
val newCounter = APP("ref",INTexp 0)
val nonAliasedCellKinds =
List.filter(fn CELLdecl{alias=NONE, ...} => true
| CELLdecl _ => false) cellKinds
fun kindName k =
if MLRiscDefs.isPredefinedCellKind k
then IDexp(IDENT(["CellsBasis"],k))
else ID k
(* Generate descriptor for a cellkind *)
fun mkDesc(CELLdecl{from, to, id, nickname, defaults, ...}) =
let val zeroReg =
List.foldr(fn ((r,LITexp(INTlit 0)),_) => APP("SOME",INTexp r)
| (_,d) => d) None defaults
val defaultValues =
LISTexp(map (fn (r,v) => TUPLEexp[INTexp(r + !from),v])
defaults, NONE)
val count = Int.max(!to - !from + 1,0)
val physicalRegs = APP("ref", ID("CellsBasis.array0"))
val exp =
APP("CellsBasis.DESC",
RECORDexp[("low", INTexp(!from)),
("high", INTexp(!to)),
("kind", kindName id),
("defaultValues", defaultValues),
("zeroReg", zeroReg),
("toString", ID("show"^id)),
("toStringWithSize", ID("show"^id^"WithSize")),
("counter", newCounter),
("dedicated", newCounter),
("physicalRegs", physicalRegs)
]
)
in VALbind(IDpat("desc_"^id), exp)
end
fun mkKindDesc(CELLdecl{alias=NONE, id, ...}) =
TUPLEexp[kindName id, ID("desc_"^id)]
| mkKindDesc(CELLdecl{alias=SOME x, id, ...}) =
TUPLEexp[kindName id, ID("desc_"^x)]
(* size of general-purpose registers in bytes *)
val cellSize = let
val CELLdecl{bits=widthOfGP, ...} = Comp.lookupCellKind md "GP"
in
widthOfGP div 8
end
(* create CellsBasis *)
val applyCellsCommon =
STRUCTUREdecl("MyCells",[],NONE,
APPsexp(IDsexp(IDENT([],"Cells")),
DECLsexp
[$["exception Cells = "^strName,
"val firstPseudo = 256"
],
VALdecl(map mkDesc nonAliasedCellKinds),
VAL("cellKindDescs",LISTexp(map mkKindDesc cellKinds,NONE)),
VAL("cellSize", LITexp(INTlit cellSize))
]))
(* User defined locations *)
(*
val locationsSig =
map (fn LOCbind(id,NONE,_) => VALSIGdecl([id],REGISTERty)
| LOCbind(id,SOME _,_) =>
VALSIGdecl([id],FUNty(INTty,REGISTERty)))
locations
*)
(* stackptrR, asmTmpR, and fasmTmpR are in the common CELLS
* interface, so we do not include them in the architecture interface
* as well -- or we would have a duplicate specification error.
*)
val locationsSig = let
fun locs(LOCbind("stackptrR",_,_)::rest) = locs rest
| locs(LOCbind("asmTmpR",_,_)::rest) = locs rest
| locs(LOCbind("fasmTmp",_,_)::rest) = locs rest
| locs(LOCbind(id,NONE,_)::rest) = VALSIGdecl([id],REGISTERty)::locs rest
| locs(LOCbind(id,SOME _,_)::rest) =
VALSIGdecl([id],FUNty(INTty,REGISTERty))::locs rest
| locs [] = []
in
locs locations
end
val locationsFun0 =
VALdecl(map (fn CELLdecl{id, ...} =>
VALbind(IDpat("Reg"^id),APP("Reg",ID id)))
cellKinds)
val locationsFun =
let fun mkLoc e =
let fun exp _ (LOCexp(id,e,_)) =
let val CELLdecl{id, ...} = Comp.lookupCellKind md id
in APP("Reg"^id,e)
end
| exp _ e = e
in #exp(R.rewrite{exp=exp,sexp=NO,decl=NO,ty=NO,pat=NO}) e
end
in
map (fn LOCbind(id,NONE,e) => VAL(id,mkLoc e)
| LOCbind(id,SOME p,e) =>
VAL(id,LAMBDAexp[CLAUSE([p],NONE,mkLoc e)]))
locations
end
fun set k = ID("set"^k)
(* body of signature *)
val sigBody =
[$["include CELLS"],
clientDefinedCellKindsSig,
showFunSig,
showWithSizeFunSig,
SEQdecl locationsSig,
addFunSig
]
(* body of structure *)
val strBody =
[$["exception "^strName,
"fun error msg = MLRiscErrorMsg.error(\""^strName^"\",msg)",
"open CellsBasis"
],
showWithSizeFuns,
showFuns,
clientDefinedCellKindsDecl,
applyCellsCommon,
$["open MyCells"],
addFun,
locationsFun0,
SEQdecl locationsFun,
Comp.declOf md "Cells"
]
in
Comp.codegen md "instructions/Cells"
[Comp.mkSig md "CELLS" sigBody,
Comp.mkStr md "Cells" sigName strBody]
end
end
|
