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fix loading of signed ints from memory

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This commit is contained in:
Ilya Rezvov
2018-04-10 21:09:58 -07:00
parent ab1782c982
commit c75900a2c8
2 changed files with 5 additions and 5 deletions
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src/Language/Wasm/Interpreter.hs
+4 -4
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@@ -649,7 +649,7 @@ eval store FunctionInstance { funcType, moduleInstance, code = Function { localT
MemoryInstance { memory } <- readIORef $ memInstances store ! (memaddrs moduleInstance ! 0)
let addr = fromIntegral $ v + fromIntegral offset
byte <- IOVector.read memory addr
let val = asWord32 $ if byte >= 128 then -1 * fromIntegral (byte .&. 0x7F) else fromIntegral byte
let val = asWord32 $ if byte >= 128 then -1 * fromIntegral (0xFF - byte + 1) else fromIntegral byte
return $ Done ctx { stack = VI32 val : rest }
step ctx@EvalCtx{ stack = (VI32 v:rest) } (I32Load16U MemArg { offset }) = do
MemoryInstance { memory } <- readIORef $ memInstances store ! (memaddrs moduleInstance ! 0)
@@ -666,7 +666,7 @@ eval store FunctionInstance { funcType, moduleInstance, code = Function { localT
byte <- IOVector.read memory $ addr + idx
return $ (fromIntegral byte :: Word32) `shiftL` (idx * 8)
val <- sum <$> mapM readByte [0..1]
let signed = asWord32 $ if val >= 2 ^ 15 then -1 * fromIntegral (val .&. 0x7FFF) else fromIntegral val
let signed = asWord32 $ if val >= 2 ^ 15 then -1 * fromIntegral (0xFFFF - val + 1) else fromIntegral val
return $ Done ctx { stack = VI32 signed : rest }
step ctx@EvalCtx{ stack = (VI32 v:rest) } (I64Load8U MemArg { offset }) = do
MemoryInstance { memory } <- readIORef $ memInstances store ! (memaddrs moduleInstance ! 0)
@@ -677,7 +677,7 @@ eval store FunctionInstance { funcType, moduleInstance, code = Function { localT
MemoryInstance { memory } <- readIORef $ memInstances store ! (memaddrs moduleInstance ! 0)
let addr = fromIntegral $ v + fromIntegral offset
byte <- IOVector.read memory addr
let val = asWord64 $ if byte >= 128 then -1 * fromIntegral (v .&. 0x7F) else fromIntegral v
let val = asWord64 $ if byte >= 128 then -1 * fromIntegral (0xFF - byte + 1) else fromIntegral byte
return $ Done ctx { stack = VI64 val : rest }
step ctx@EvalCtx{ stack = (VI32 v:rest) } (I64Load16U MemArg { offset }) = do
MemoryInstance { memory } <- readIORef $ memInstances store ! (memaddrs moduleInstance ! 0)
@@ -694,7 +694,7 @@ eval store FunctionInstance { funcType, moduleInstance, code = Function { localT
byte <- IOVector.read memory $ addr + idx
return $ (fromIntegral byte :: Word32) `shiftL` (idx * 8)
val <- sum <$> mapM readByte [0..1]
let signed = asWord64 $ if val >= 2 ^ 15 then -1 * fromIntegral (val .&. 0x7FFF) else fromIntegral val
let signed = asWord64 $ if val >= 2 ^ 15 then -1 * fromIntegral (0xFFFF - val + 1) else fromIntegral val
return $ Done ctx { stack = VI64 signed : rest }
step ctx@EvalCtx{ stack = (VI32 v:rest) } (I64Load32U MemArg { offset }) = do
MemoryInstance { memory } <- readIORef $ memInstances store ! (memaddrs moduleInstance ! 0)