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{-# LANGUAGE OverloadedStrings #-}
module GHC.StgToJS.Regs
( StgReg (..)
, Special(..)
, sp
, stack
, r1, r2, r3, r4
, regsFromR1
, regsFromR2
, jsRegsFromR1
, jsRegsFromR2
, StgRet (..)
, jsRegToInt
, intToJSReg
, jsReg
, maxReg
, minReg
)
where
import GHC.Prelude
import GHC.JS.Syntax
import GHC.JS.Make
import GHC.Data.FastString
import Data.Array
import Data.Char
-- | General purpose "registers"
--
-- The JS backend arbitrarily supports 128 registers
data StgReg
= R1 | R2 | R3 | R4 | R5 | R6 | R7 | R8
| R9 | R10 | R11 | R12 | R13 | R14 | R15 | R16
| R17 | R18 | R19 | R20 | R21 | R22 | R23 | R24
| R25 | R26 | R27 | R28 | R29 | R30 | R31 | R32
| R33 | R34 | R35 | R36 | R37 | R38 | R39 | R40
| R41 | R42 | R43 | R44 | R45 | R46 | R47 | R48
| R49 | R50 | R51 | R52 | R53 | R54 | R55 | R56
| R57 | R58 | R59 | R60 | R61 | R62 | R63 | R64
| R65 | R66 | R67 | R68 | R69 | R70 | R71 | R72
| R73 | R74 | R75 | R76 | R77 | R78 | R79 | R80
| R81 | R82 | R83 | R84 | R85 | R86 | R87 | R88
| R89 | R90 | R91 | R92 | R93 | R94 | R95 | R96
| R97 | R98 | R99 | R100 | R101 | R102 | R103 | R104
| R105 | R106 | R107 | R108 | R109 | R110 | R111 | R112
| R113 | R114 | R115 | R116 | R117 | R118 | R119 | R120
| R121 | R122 | R123 | R124 | R125 | R126 | R127 | R128
deriving (Eq, Ord, Show, Enum, Bounded, Ix)
-- | Stack registers
data Special
= Stack
| Sp
deriving (Show, Eq)
-- | Return registers
--
-- Extra results from foreign calls can be stored here (while first result is
-- directly returned)
data StgRet = Ret1 | Ret2 | Ret3 | Ret4 | Ret5 | Ret6 | Ret7 | Ret8 | Ret9 | Ret10
deriving (Eq, Ord, Show, Enum, Bounded, Ix)
instance ToJExpr Special where
toJExpr Stack = var "h$stack"
toJExpr Sp = var "h$sp"
instance ToJExpr StgReg where
toJExpr r = registers ! r
instance ToJExpr StgRet where
toJExpr r = rets ! r
---------------------------------------------------
-- helpers
---------------------------------------------------
sp :: JExpr
sp = toJExpr Sp
stack :: JExpr
stack = toJExpr Stack
r1, r2, r3, r4 :: JExpr
r1 = toJExpr R1
r2 = toJExpr R2
r3 = toJExpr R3
r4 = toJExpr R4
jsRegToInt :: StgReg -> Int
jsRegToInt = (+1) . fromEnum
intToJSReg :: Int -> StgReg
intToJSReg r = toEnum (r - 1)
jsReg :: Int -> JExpr
jsReg r = toJExpr (intToJSReg r)
maxReg :: Int
maxReg = jsRegToInt maxBound
minReg :: Int
minReg = jsRegToInt minBound
-- | List of registers, starting from R1
regsFromR1 :: [StgReg]
regsFromR1 = enumFrom R1
-- | List of registers, starting from R2
regsFromR2 :: [StgReg]
regsFromR2 = tail regsFromR1
-- | List of registers, starting from R1 as JExpr
jsRegsFromR1 :: [JExpr]
jsRegsFromR1 = fmap toJExpr regsFromR1
-- | List of registers, starting from R2 as JExpr
jsRegsFromR2 :: [JExpr]
jsRegsFromR2 = tail jsRegsFromR1
---------------------------------------------------
-- caches
---------------------------------------------------
-- cache JExpr representing StgReg
registers :: Array StgReg JExpr
registers = listArray (minBound, maxBound) (map regN regsFromR1)
where
regN r
| fromEnum r < 32 = var . mkFastString . ("h$"++) . map toLower . show $ r
| otherwise = IdxExpr (var "h$regs")
(toJExpr ((fromEnum r) - 32))
-- cache JExpr representing StgRet
rets :: Array StgRet JExpr
rets = listArray (minBound, maxBound) (map retN (enumFrom Ret1))
where
retN = var . mkFastString . ("h$"++) . map toLower . show
|
