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{-# Language TemplateHaskell, ApplicativeDo #-}
module Fig.Emulator.GB.Test.Instr where
import Control.Lens.TH (makeLenses)
import Control.Lens ((^.))
import Control.Monad.State (StateT(..))
import Data.Word (Word8, Word16)
import qualified Data.Aeson as Aeson
import Fig.Prelude
import Fig.Emulator.GB.Utils
import Fig.Emulator.GB.CPU
import Fig.Emulator.GB.CPU.Instruction
import Fig.Emulator.GB.Bus (Bus(..), Addr(..))
import qualified Fig.Emulator.GB.Bus as Bus
import Fig.Emulator.GB.Component.RAM
newtype InstrTestError = InstrTestError Text
deriving Show
instance Exception InstrTestError
instance Pretty InstrTestError where
pretty (InstrTestError b) = mconcat
[ "Instruction test error: "
, b
]
data TestVals = TestVals
{ _testvalsA :: !Word8
, _testvalsB :: !Word8
, _testvalsC :: !Word8
, _testvalsD :: !Word8
, _testvalsE :: !Word8
, _testvalsF :: !Word8
, _testvalsH :: !Word8
, _testvalsL :: !Word8
, _testvalsPC :: !Word16
, _testvalsSP :: !Word16
, _testvalsRAM :: ![(Word16, Word8)]
}
makeLenses 'TestVals
instance Aeson.FromJSON TestVals where
parseJSON = Aeson.withObject "TestVals" $ \v -> do
_testvalsA <- v Aeson..: "a"
_testvalsB <- v Aeson..: "b"
_testvalsC <- v Aeson..: "c"
_testvalsD <- v Aeson..: "d"
_testvalsE <- v Aeson..: "e"
_testvalsF <- v Aeson..: "f"
_testvalsH <- v Aeson..: "h"
_testvalsL <- v Aeson..: "l"
_testvalsPC <- v Aeson..: "pc"
_testvalsSP <- v Aeson..: "sp"
_testvalsRAM <- v Aeson..: "ram"
pure TestVals{..}
data Testcase = Testcase
{ _testcaseName :: !Text
, _testcaseInitial :: !TestVals
, _testcaseFinal :: !TestVals
}
makeLenses 'Testcase
instance Aeson.FromJSON Testcase where
parseJSON = Aeson.withObject "Testcase" $ \v -> do
_testcaseName <- v Aeson..: "name"
_testcaseInitial <- v Aeson..: "initial"
_testcaseFinal <- v Aeson..: "final"
pure Testcase {..}
readTestcases :: (MonadIO m, MonadThrow m) => FilePath -> m [Testcase]
readTestcases p = liftIO (Aeson.decodeFileStrict p) >>= \case
Just ts -> pure ts
Nothing -> throwM . InstrTestError $ "failed to read testcases at " <> pack p
cpuInstrTest :: (MonadIO m, MonadThrow m) => TestVals -> m (CPU m)
cpuInstrTest vs = do
let
(z, n, h, c) = w8flags $ vs ^. testvalsF
initialBus = Bus [compWRAM 0x0000 $ 64 * 1024]
finalBus <- foldM (\b (addr, v) -> Bus.write b (Addr addr) v) initialBus $ vs ^. testvalsRAM
pure CPU
{ _lastPC = 0x0
, _lastIns = Nop
, _running = True
, _regs = initialRegs
{ _regA = vs ^. testvalsA
, _regB = vs ^. testvalsB
, _regC = vs ^. testvalsC
, _regD = vs ^. testvalsD
, _regE = vs ^. testvalsE
, _regH = vs ^. testvalsH
, _regL = vs ^. testvalsL
, _regPC = vs ^. testvalsPC - 1
, _regSP = vs ^. testvalsSP
, _regFlagZ = z
, _regFlagN = n
, _regFlagH = h
, _regFlagC = c
}
, _bus = finalBus
}
checkCPU :: forall m. (MonadIO m, MonadThrow m) => Text -> TestVals -> CPU m -> m ()
checkCPU tnm vs c = do
let
check :: (Eq a, Show a) => Text -> a -> a -> m ()
check nm eval aval = if eval == aval
then pure ()
else throwM . InstrTestError $ mconcat
[ "while running test ", tnm, ":\n"
, nm <> " mismatch: expected "
, tshow eval, ", got ", tshow aval
]
check "register A" (vs ^. testvalsA) (c ^. regs . regA)
check "register B" (vs ^. testvalsB) (c ^. regs . regB)
check "register C" (vs ^. testvalsC) (c ^. regs . regC)
check "register D" (vs ^. testvalsD) (c ^. regs . regD)
check "register E" (vs ^. testvalsE) (c ^. regs . regE)
check "register H" (vs ^. testvalsH) (c ^. regs . regH)
check "register L" (vs ^. testvalsL) (c ^. regs . regL)
check "PC" (vs ^. testvalsPC - 1) (c ^. regs . regPC)
check "SP" (vs ^. testvalsSP) (c ^. regs . regSP)
let (fz, fn, fh, fc) = w8flags $ vs ^. testvalsF
check "flag Z" fz (c ^. regs . regFlagZ)
check "flag N" fn (c ^. regs . regFlagN)
check "flag H" fh (c ^. regs . regFlagH)
check "flag C" fc (c ^. regs . regFlagC)
forM_ (vs ^. testvalsRAM) \(Addr -> addr, eval) -> do
Bus.read (c ^. bus) addr >>= \case
Nothing -> throwM . InstrTestError $ "failed to read expected address: " <> pretty addr
Just aval -> check ("memory address " <> pretty addr) eval aval
runTestcase :: (MonadIO m, MonadThrow m) => Testcase -> m ()
runTestcase tc = liftIO do
initial <- cpuInstrTest $ tc ^. testcaseInitial
let
body :: forall m'. Emulating m' => m' Instruction
body = do
ins <- decode
step ins
pure ins
(ins, final) <- runStateT body initial
checkCPU (tc ^. testcaseName <> " (" <> tshow ins <> ")") (tc ^. testcaseFinal) final
log $ "Passed: " <> tc ^. testcaseName
|
