-(* L2 Compiler
+(* L3 Compiler
* Takes a list of mappings of temporaries to colors and a pseudoasm listing,
* then produces x86 code.
* Author: Chris Lu <czl@andrew.cmu.edu>
signature SOLIDIFY =
sig
type colorings = (Temp.temp * int) list
- type asm = x86.insn list
+ type asm = Blarg.insn list
val solidify : colorings -> asm -> asm
end
structure Solidify :> SOLIDIFY =
struct
- structure X = x86
+ structure X = Blarg
structure T = Temp
type colorings = (Temp.temp * int) list
- type asm = x86.insn list
+ type asm = Blarg.insn list
exception Spilled
-
+
+ structure TempMap = SplayMapFn(struct
+ type ord_key = Temp.temp
+ val compare = Temp.compare
+ end)
+ structure Tm = Temp
+
fun solidify (regmap : colorings) (instrs : asm) : asm =
let
- (* r14d and r15d is reserved for spilling *)
- val maxreg = X.regtonum X.R13D
+ (* r11 and r12 is reserved for spilling *)
+ val maxreg = X.regtonum X.R10
fun numtoreg n =
if (n > maxreg)
then raise Spilled
else X.numtoreg n
-
- fun temptonum (t: T.temp) : int =
- (List.hd
- (List.map (fn (_, n) => n)
- (List.filter (fn (a, _) => (Temp.compare (a, t) = EQUAL)) regmap)))
-
- fun temptoreg (t: T.temp) : x86.reg =
+
+ val tempnums = List.foldr (fn ((t,n),b) => TempMap.insert(b,t,n)) (TempMap.empty) regmap
+ fun temptonum (t: T.temp) : int = valOf (TempMap.find (tempnums, t))
+
+ fun temptoreg (t: T.temp) : Blarg.reg =
numtoreg (temptonum t)
- handle Empty =>
- (ErrorMsg.warn NONE ("Uncolored temp "^(Temp.name t)^" -- dead code?") ;
- X.R15D) (*If we don't care about the output, then it is cool to explode this; R15D is guaranteed not to be used across builtin blocks.*)
-
- val spillreg1 = X.R14D
-
- val prologue = [X.DIRECTIVE "\tpush %rbx\n\tpush %r12\n\tpush %r13\n\tpush %r14\n\tpush %r15"] (* Could be done better. *)
- val epilogue = [X.DIRECTIVE "\tpop %r15\n\tpop %r14\n\tpop %r13\n\tpop %r12\n\tpop %rbx"]
-
- val numreg = foldr (Int.max) 0 (map (fn (_, n) => n) regmap) (* Number of registers used. *)
- val nspilled = Int.max (numreg - maxreg, 0) (* Number of spilled registers. *)
- fun isspilled (X.TEMP temp) = (((temptonum temp) > maxreg) handle Empty => false) (* Whether a register is spilled *)
+ handle Option => raise ErrorMsg.InternalError ("Uncolored temp "^(Temp.name t)^", agh!")
+
+ val spillreg1 = X.R12
+ val spillreg2 = X.R11
+
+ (* Determine which need to be saved. *)
+ val opsused = (map (fn (_, n) => X.REG (numtoreg n handle Spilled => X.R12)) regmap) @ [X.REG X.R11]
+ val saveregs = X.OperSet.intersection (
+ X.OperSet.addList (X.OperSet.empty, opsused),
+ X.OperSet.addList (
+ X.OperSet.empty,
+ [X.REG X.R7,
+ X.REG X.R8,
+ X.REG X.R9,
+ X.REG X.R10,
+ X.REG X.R11,
+ X.REG X.R12]))
+ val savelist = X.OperSet.listItems saveregs
+ val nsave = length savelist
+
+ val numreg = foldr (Int.max) 0 (map (fn (_, n) => n) regmap) (* Number of registers used. *)
+ val nspilled = Int.max (numreg - maxreg, 0) (* Number of spilled registers. *)
+ fun isspilled (X.TEMP temp) = (temptonum temp) > maxreg (* Whether a register is spilled *)
+ | isspilled (X.STACKARG _) = true
| isspilled _ = false
- fun stackpos (reg: int) = (reg - maxreg) * ~4 (* Stack position of some register number *)
-
- fun spill (X.TEMP temp, xreg: x86.reg) = (* Spill a register if need be. *)
- if (isspilled (X.TEMP temp))
- then [X.MOVL (X.REL (X.RSP, stackpos (temptonum temp)), X.REG xreg)]
- else nil
- | spill _ = nil (* Nothing else can be spilled. *)
- fun unspill (X.TEMP temp, xreg: x86.reg) = (* Unspill a register if need be. *)
- if (isspilled (X.TEMP temp))
- then [X.MOVL (X.REG xreg, X.REL (X.RSP, stackpos (temptonum temp)))]
- else nil
+
+ val stacksz = (nspilled + nsave) * 1
+ fun stackpos (reg: int) = stacksz - (reg - maxreg + nsave) * 1 (* Stack position of some register number *)
+
+ val prologue =
+ [X.INSN (X.AL, X.MOVLIT (X.REG X.R4, Word.fromInt stacksz)),
+ X.INSN (X.AL, X.SUB (X.REG X.SP, X.REG X.R4))] @
+ (List.concat
+ (ListPair.map
+ (fn (num, reg) =>
+ [X.INSN (X.AL, X.MOVLIT (X.REG X.R4, Word.fromInt (stacksz - 1*(num+1)))),
+ X.INSN (X.AL, X.ADD (X.REG X.R4, X.REG X.SP)),
+ X.INSN (X.AL, X.STO (X.REG X.R4, reg))])
+ (List.tabulate (nsave, fn x => x), savelist)
+ )
+ )
+ val epilogue =
+ (List.concat
+ (ListPair.map
+ (fn (num, reg) =>
+ [X.INSN (X.AL, X.MOVLIT (X.REG X.R4, Word.fromInt (stacksz - 1*(num+1)))),
+ X.INSN (X.AL, X.ADD (X.REG X.R4, X.REG X.SP)),
+ X.INSN (X.AL, X.LDR (reg, X.REG X.R4))])
+ (List.tabulate (nsave, fn x => x), savelist)
+ )
+ ) @
+ [X.INSN (X.AL, X.MOVLIT (X.REG X.R4, Word.fromInt stacksz)),
+ X.INSN (X.AL, X.ADD (X.REG X.SP, X.REG X.R4))]
+ val endlbl = Label.new()
+
+ fun spill (X.TEMP temp, xreg: Blarg.reg) = (* Spill a register if need be. *)
+ let
+ val base = X.REG X.SP
+ val offs = Word.fromInt (stackpos (temptonum temp))
+ in
+ if (isspilled (X.TEMP temp))
+ then raise ErrorMsg.InternalError "unspill not supported" (*[X.MOV ((X.REL (base, offs, 0w1), Tm.Quad), (X.REG xreg, Tm.Quad))]*)
+ else nil
+ end
+ | spill (X.STACKARG _, _) = raise ErrorMsg.InternalError "Cannot spill to a stack arg"
+ | spill _ = nil (* Nothing else can be spilled. *)
+ fun unspill (X.TEMP temp, xreg: Blarg.reg) = (* Unspill a register if need be. *)
+ let
+ val base = X.REG X.SP
+ val offs = Word.fromInt (stackpos (temptonum temp))
+ in
+ if (isspilled (X.TEMP temp))
+ then raise ErrorMsg.InternalError "unspill not supported" (*[X.MOV ((X.REG xreg, Tm.Quad), (X.REL (base, offs, 0w1), Tm.Quad))]*)
+ else nil
+ end
+ | unspill (X.STACKARG arg, xreg) =
+ let
+ val base = X.REG X.SP
+ val offs = Word.fromInt (stacksz + 8 + (arg * 8))
+ in
+ (*[X.MOV ((X.REG xreg, s), (X.REL (base, offs, 0w1), s))]*)
+ raise ErrorMsg.InternalError "unspill from stack not supported"
+ end
| unspill _ = nil
+
+ fun unspill_ops (op1, op2) =
+ case (isspilled op1, isspilled op2)
+ of (false, false) => []
+ | (true, false) => unspill (op1, spillreg1)
+ | (false, true) => unspill (op2, spillreg2)
+ | (true, true) => unspill (op1, spillreg1) @ unspill (op2, spillreg2)
+
+ fun respill_ops (op1, op2) =
+ case (isspilled op1, isspilled op2) (* no instruction writes back to op2 *)
+ of (false, _) => []
+ | (true, _) => spill (op1, spillreg1)
- fun realoper (X.TEMP temp) = X.REG (temptoreg temp) (* Makes a operand 'real'. *)
- | realoper r = r
- fun stackoper (X.TEMP temp) =
- if not (isspilled (X.TEMP temp)) then raise ErrorMsg.InternalError "stackoper on unspilled temp?"
- else X.REL (X.RSP, stackpos (temptonum temp))
- | stackoper _ = raise ErrorMsg.InternalError "stackoper on not temp?"
+ fun real_op1 op1 =
+ case op1
+ of (X.TEMP temp) => if isspilled op1
+ then (X.REG spillreg1)
+ else X.REG (temptoreg temp)
+ | (X.STACKARG arg) => X.REG spillreg1
+ | r => r
+ fun real_ops (op1, op2) =
+ (case op1
+ of (X.TEMP temp) => if isspilled op1
+ then (X.REG spillreg1)
+ else X.REG (temptoreg temp)
+ | (X.STACKARG arg) => X.REG spillreg1
+ | r => r,
+ case op2
+ of (X.TEMP temp) => if isspilled op2
+ then (X.REG spillreg2)
+ else X.REG (temptoreg temp)
+ | (X.STACKARG arg) => X.REG spillreg2
+ | r => r)
+
+ fun whack_insn (pred, insn, op1, op2) =
+ (map (fn i => X.INSN (pred, i)) (unspill_ops (op1, op2))) @
+ [ X.INSN (pred, insn (real_ops (op1, op2))) ] @
+ (map (fn i => X.INSN (pred, i)) (respill_ops (op1, op2)))
+
fun transform (X.DIRECTIVE s) = [X.DIRECTIVE s]
| transform (X.COMMENT s) = [X.COMMENT s]
- | transform (X.MOVL (dest, src)) =
- if (isspilled dest)
- then
- unspill (src, spillreg1) @
- [ X.MOVL(
- realoper dest handle Spilled => stackoper dest,
- realoper src handle Spilled => X.REG spillreg1)]
- else
- [ X.MOVL(
- realoper dest handle Spilled => raise ErrorMsg.InternalError "But we said that wasn't spilled?",
- realoper src handle Spilled => stackoper src)]
- | transform (X.SUBL (dest, src)) =
- unspill (src, spillreg1) @
- [ X.SUBL(
- realoper dest handle Spilled => stackoper dest,
- realoper src handle Spilled => X.REG spillreg1)]
- | transform (X.IMUL (dest, src)) =
- unspill (dest, spillreg1) @
- [ X.IMUL(
- realoper dest handle Spilled => X.REG spillreg1,
- realoper src handle Spilled => stackoper src)] @
- spill (dest, spillreg1)
- | transform (X.IMUL3 (dest, src, const)) =
- [ X.IMUL3(
- realoper dest handle Spilled => X.REG spillreg1,
- realoper src handle Spilled => stackoper src,
- const)] @
- spill (dest, spillreg1)
- | transform (X.ADDL (dest, src)) = (* You can have either operand spilled, but not both. Pick one. *)
- if (isspilled dest)
- then
- unspill (src, spillreg1) @
- [ X.ADDL(
- realoper dest handle Spilled => stackoper dest,
- realoper src handle Spilled => X.REG spillreg1)]
- else
- [ X.ADDL(
- realoper dest handle Spilled => raise ErrorMsg.InternalError "But we said that wasn't spilled?",
- realoper src handle Spilled => stackoper src)]
- | transform (X.IDIVL (src)) = [ X.IDIVL(realoper src handle Spilled => stackoper src)]
- | transform (X.NEG (src)) = [ X.NEG(realoper src handle Spilled => stackoper src)]
- | transform (X.NOTL (src)) = [ X.NOTL(realoper src handle Spilled => stackoper src)]
- | transform (X.SALL (dest, shft)) =
- [ X.SALL (
- realoper dest handle Spilled => stackoper dest,
- shft)]
- | transform (X.SARL (dest, shft)) =
- [ X.SARL (
- realoper dest handle Spilled => stackoper dest,
- shft)]
- | transform (X.CLTD) = [ X.CLTD ]
- | transform (X.ANDL (dest, src)) =
- unspill (src, spillreg1) @
- [ X.ANDL(
- realoper dest handle Spilled => stackoper dest,
- realoper src handle Spilled => X.REG spillreg1)]
- | transform (X.ORL (dest, src)) =
- unspill (src, spillreg1) @
- [ X.ORL(
- realoper dest handle Spilled => stackoper dest,
- realoper src handle Spilled => X.REG spillreg1)]
- | transform (X.XORL (dest, src)) =
- unspill (src, spillreg1) @
- [ X.XORL(
- realoper dest handle Spilled => stackoper dest,
- realoper src handle Spilled => X.REG spillreg1)]
- | transform (X.CMPL (op1, op2)) =
- unspill (op2, spillreg1) @
- [ X.CMPL(
- realoper op1 handle Spilled => stackoper op1,
- realoper op2 handle Spilled => X.REG spillreg1)]
- | transform (X.TEST (op1, op2)) =
- unspill (op2, spillreg1) @
- [ X.TEST(
- realoper op1 handle Spilled => stackoper op1,
- realoper op2 handle Spilled => X.REG spillreg1)]
- | transform (X.SETNE (src)) = [ X.SETNE(realoper src handle Spilled => stackoper src)]
- | transform (X.SETE (src)) = [ X.SETE(realoper src handle Spilled => stackoper src)]
- | transform (X.SETLE (src)) = [ X.SETLE(realoper src handle Spilled => stackoper src)]
- | transform (X.SETL (src)) = [ X.SETL(realoper src handle Spilled => stackoper src)]
- | transform (X.SETGE (src)) = [ X.SETGE(realoper src handle Spilled => stackoper src)]
- | transform (X.SETG (src)) = [ X.SETG(realoper src handle Spilled => stackoper src)]
- | transform (X.MOVZBL (dest, src)) =
- [ X.MOVZBL(
- realoper dest handle Spilled => X.REG spillreg1,
- realoper src handle Spilled => stackoper src)]
- @ spill (dest, spillreg1)
- | transform (X.RET) = epilogue @ [X.RET]
- | transform (X.LABEL l) = [ X.LABEL l ]
- | transform (X.JMP l) = [ X.JMP l ]
- | transform (X.JE l) = [ X.JE l]
- | transform (X.JNE l) = [ X.JNE l]
-(* | transform _ = raise ErrorMsg.InternalError ("Unimplemented transform")*)
+ | transform (X.LABEL l) = [X.LABEL l]
+ | transform (X.LIVEIGN a) = transform a
+
+ (* god the special cases are going to suck *)
+ | transform (X.INSN (pred, X.MOVLIT (op1, w))) =
+ [ X.INSN (pred, X.MOVLIT (real_op1 op1, w)) ] @
+ (if isspilled op1
+ then spill (op1, spillreg1)
+ else [])
+ | transform (X.INSN (pred, X.MOVSYM (op1, w))) =
+ [ X.INSN (pred, X.MOVSYM (real_op1 op1, w)) ] @
+ (if isspilled op1
+ then spill (op1, spillreg1)
+ else [])
+ | transform (X.INSN (pred, X.MOVLBL (op1, w))) =
+ [ X.INSN (pred, X.MOVLBL (real_op1 op1, w)) ] @
+ (if isspilled op1
+ then spill (op1, spillreg1)
+ else [])
+
+ (* and here comes the boilerplate *)
+ | transform (X.INSN (pred, X.LDR (op1, op2))) = whack_insn (pred, X.LDR, op1, op2)
+ | transform (X.INSN (pred, X.STO (op1, op2))) = whack_insn (pred, X.STO, op1, op2)
+ | transform (X.INSN (pred, X.MOV (op1, op2))) = whack_insn (pred, X.MOV, op1, op2)
+ | transform (X.INSN (pred, X.MOVS (op1, op2))) = whack_insn (pred, X.MOVS, op1, op2)
+ | transform (X.INSN (pred, X.ADD (op1, op2))) = whack_insn (pred, X.ADD, op1, op2)
+ | transform (X.INSN (pred, X.ADDS (op1, op2))) = whack_insn (pred, X.ADDS, op1, op2)
+ | transform (X.INSN (pred, X.SUB (op1, op2))) = whack_insn (pred, X.SUB, op1, op2)
+ | transform (X.INSN (pred, X.SUBS (op1, op2))) = whack_insn (pred, X.SUBS, op1, op2)
+ | transform (X.INSN (pred, X.AND (op1, op2))) = whack_insn (pred, X.AND, op1, op2)
+ | transform (X.INSN (pred, X.ANDS (op1, op2))) = whack_insn (pred, X.ANDS, op1, op2)
+ | transform (X.INSN (pred, X.NOT (op1, op2))) = whack_insn (pred, X.NOT, op1, op2)
+ | transform (X.INSN (pred, X.NOTS (op1, op2))) = whack_insn (pred, X.NOTS, op1, op2)
+ | transform (X.INSN (pred, X.PUSH (op1, op2))) = if isspilled op2
+ then raise ErrorMsg.InternalError "PUSH on spilled op2 is not possible"
+ else [ X.INSN (pred, X.PUSH (real_ops (op1, op2))) ]
+ | transform (X.INSN (pred, X.POP (X.REG X.SP, X.REG X.PC))) = [ X.INSN (pred, X.MOVLBL (X.REG X.PC, endlbl)) ] (* optimize epilogue? *)
+ | transform (X.INSN (pred, X.POP (op1, op2))) = if isspilled op2
+ then raise ErrorMsg.InternalError "POP on spilled op2 is not possible"
+ else [ X.INSN (pred, X.POP (real_ops (op1, op2))) ]
+ | transform (X.INSN (pred, X.CALL (op1, op2, i))) = if isspilled op2
+ then raise ErrorMsg.InternalError "CALL on spilled op2 is not possible"
+ else [ X.INSN (pred, X.CALL ((fn (x, y) => (x, y, i)) (real_ops (op1, op2)))) ]
+ | transform (X.INSN (pred, X.SHR (op1, op2))) = whack_insn (pred, X.SHR, op1, op2)
+ | transform (X.INSN (pred, X.SHL (op1, op2))) = whack_insn (pred, X.SHL, op1, op2)
+ (*| transform _ = raise ErrorMsg.InternalError "unimplemented"*)
in
- List.concat (prologue :: (map transform instrs))
-
+ (*if (nsave < 2) then
+ List.concat (prologue :: (map transform instrs))
+ else
+ *)
+ List.concat (prologue ::
+ ((map transform instrs) @
+ [[X.LABEL endlbl],
+ epilogue,
+ [X.INSN (X.AL, X.POP (X.REG X.SP, X.REG X.PC))]
+ ]
+ )
+ )
end
end
git.joshuawise.com / snipe.git / blobdiff