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implementation module Sjit.Compile
import StdEnv
import StdGeneric
import StdOverloadedList
import Control.Applicative
import Control.Monad
import Data.Either
from Data.Func import mapSt, $
import Data.Functor
from Data.Map import :: Map(..), get, put, newMap, fromList
import Data.Maybe
import Sjit.Syntax
import code from "sjit_c."
appendProgram :: !Bool !Program !JITState -> JITState
appendProgram is_main prog jitst
# new_code_ptr = append
jitst.code_start jitst.code_len jitst.code_ptr
jitst.mapping
jitst.n_instr
(encode prog)
is_main
=
{ jitst
& code_ptr = new_code_ptr
, n_instr = jitst.n_instr + size prog
}
where
append :: !Int !Int !Int !Int !Int !{#Int} !Bool -> Int
append _ _ _ _ _ _ _ = code {
ccall jit_append "pIppIAI:p"
}
bootstrap :: (!Program, !CompileState)
bootstrap
# (len_bs, bs_funs) = bootstrap_funs
# is = {i \\ i <- flatten [is \\ (_,is) <- header]}
=
( is,
{ vars = newMap
, funs = fromList bs_funs
, sp = 0
, pc = len_bs
, blocks = [!is!]
, new_block = [!!]
, placeholder = 0
, jitst = appendProgram False is (initJITState 1000)
})
where
bootstrap_funs :: (!Int, ![(String, Int)])
bootstrap_funs = iter 0 header
where
iter :: !Int ![(String, [Instr])] -> (!Int, ![(String, Int)])
iter pc [] = (pc, [])
iter pc [(name,is):rest]
# fun = (name,pc)
# (pc,funs) = iter (pc+length is) rest
= (pc,[fun:funs])
header :: [(!String, ![Instr])]
header =
[ ("_", [PushI 0,Call 0 /* main address */,Halt])
]
initJITState :: !Int -> JITState
initJITState maxlen
# (code_start,mapping) = init maxlen (maxlen*10)
=
{ n_instr = 0
, code_start = code_start
, code_len = maxlen*10
, code_ptr = code_start
, mapping = mapping
}
where
init :: !Int !Int -> (!Int, !Int)
init _ _ = code {
ccall init_jit "II:Vpp"
}
class toInstrs a :: !a -> [Instr]
instance toInstrs Instr where toInstrs i = [i]
instance toInstrs [a] | toInstrs a where toInstrs xs = [i \\ x <- xs, i <- toInstrs x]
gen :: !newis !CompileState -> m CompileState | Monad m & toInstrs newis
gen newis cs = pure (foldr add cs (toInstrs newis))
where
add i cs = {cs & new_block=[!i:cs.new_block!], sp=sp, pc=cs.pc+1}
where
sp = cs.sp + case i of
PushRef _ -> 1
PushI _ -> 1
Put _ -> -1
Pop n -> 0-n
Call _ -> 0
Jmp _ -> 0
JmpTrue _ -> 0
Ret -> -1
Halt -> -2
IAdd -> -1
IMul -> -1
ISub -> -1
IDiv -> -1
PlaceHolder _ n -> n
reserve :: !Int !CompileState -> m (!Int, !CompileState) | Monad m
reserve stack_effect cs=:{placeholder=p} =
gen (PlaceHolder p stack_effect) {cs & placeholder=p+1} >>= \cs -> pure (p,cs)
fillPlaceHolder :: !Int !Instr !CompileState -> Either String CompileState
fillPlaceHolder p newi cs = case replace cs.new_block of
Nothing -> Left "internal error with placeholder"
Just nb -> Right {cs & new_block=nb}
where
replace :: ![!Instr!] -> Maybe [!Instr!]
replace [!PlaceHolder n _:is!] | n==p = Just [!newi:is!]
replace [!i:is!] = (\is -> [!i:is!]) <$> replace is
replace [!!] = Nothing
compile :: !Function !CompileState -> Either String CompileState
compile f cs
# cs & sp = 0
# cs & funs = put f.fun_name cs.pc cs.funs
# vars = cs.vars
# cs & vars = foldr (uncurry put) cs.vars [(v,sp) \\ v <- f.fun_args & sp <- [1..]]
# nargs = max 1 (length f.fun_args)
= case expr f.fun_expr cs >>= gen [Ret,Put nargs] of
Left e -> Left e
Right cs
| cs.sp <> -1 -> Left ("sp was " +++ toString cs.sp +++ " after compiling '" +++ f.fun_name +++ "'")
# is = {i \\ i <|- Reverse cs.new_block}
-> Right
{ cs
& vars = vars
, pc = cs.pc
, blocks = cs.blocks ++| [!is!]
, new_block = [!!]
, jitst = appendProgram (f.fun_name == "main") is cs.jitst
}
where
expr :: !Expr !CompileState -> Either String CompileState
expr (Int i) cs = gen (PushI i) cs
expr (Bool b) cs = gen (PushI (if b 1 0)) cs
expr (Var v) cs = case get v cs.vars of
Just i -> gen (PushRef (i+cs.sp)) cs
Nothing -> Left ("undefined variable '" +++ v +++ "'")
expr (App f args) cs
# args = if (args=:[]) [Int 0] args
= foldM (flip expr) cs (reverse args) >>= \cs -> case get f cs.funs of
Nothing -> case f of
"+" -> gen [IAdd] cs
"-" -> gen [ISub] cs
"*" -> gen [IMul] cs
"/" -> gen [IDiv] cs
_ -> Left ("undefined function '" +++ toString f +++ "'")
Just f -> case length args of
1 -> gen [Call f] cs
n -> gen [Pop (n-1),Call f] cs
expr (If b t e) cs =
expr b cs >>=
reserve -1 >>= \(jmptrue,cs=:{sp=orgsp}) ->
expr e cs >>=
reserve 0 >>= \(jmpend,cs) ->
fillPlaceHolder jmptrue (JmpTrue cs.pc) {cs & sp=orgsp} >>=
expr t >>= \cs ->
fillPlaceHolder jmpend (Jmp cs.pc) cs
generic gEncodedSize a :: !a -> Int
gEncodedSize{|Int|} _ = 1
gEncodedSize{|{!}|} fx xs = 1 + sum [fx x \\ x <-: xs]
gEncodedSize{|UNIT|} _ = 0
gEncodedSize{|PAIR|} fx fy (PAIR x y) = fx x + fy y
gEncodedSize{|EITHER|} fl _ (LEFT l) = fl l
gEncodedSize{|EITHER|} _ fr (RIGHT r) = fr r
gEncodedSize{|CONS|} fx (CONS x) = fx x + 1
gEncodedSize{|OBJECT|} fx (OBJECT x) = fx x
generic gEncode a :: !a !Int !*{#Int} -> (!Int, !*{#Int})
gEncode{|Int|} n i arr = (i+1, {arr & [i]=n})
gEncode{|{!}|} fx xs i arr = walk 0 (i+1) {arr & [i]=sz}
where
sz = size xs
walk ai i arr
| ai >= sz = (i,arr)
# (i,arr) = fx xs.[ai] i arr
= walk (ai+1) i arr
gEncode{|UNIT|} _ i arr = (i,arr)
gEncode{|PAIR|} fx fy (PAIR x y) i arr
# (i,arr) = fx x i arr
= fy y i arr
gEncode{|EITHER|} fl _ (LEFT l) i arr = fl l i arr
gEncode{|EITHER|} _ fr (RIGHT r) i arr = fr r i arr
gEncode{|CONS of {gcd_index}|} fx (CONS x) i arr = fx x (i+1) {arr & [i]=gcd_index}
gEncode{|OBJECT|} fx (OBJECT x) i arr = fx x i arr
derive gEncodedSize Instr
derive gEncode Instr
encode :: !a -> *{#Int} | gEncodedSize{|*|}, gEncode{|*|} a
encode x
# (_,arr) = gEncode{|*|} x 0 (createArray (gEncodedSize{|*|} x) -1)
= arr
|
