blob: d77060779eddd1e6dcb63d650132453ecc0aa44b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE ScopedTypeVariables #-}
import Control.Monad
import Type.Reflection
import GHC.Stack
import GHC.Exts.Heap.Closures
assertSize :: forall a. (HasCallStack, Typeable a)
=> a -> Int -> IO ()
assertSize !x expected = do
let !size = closureSize (asBox x)
when (size /= expected) $ do
putStrLn $ "closureSize ("++show (typeRep @a)++") == "++show size++", expected "++show expected
putStrLn $ prettyCallStack callStack
{-# NOINLINE assertSize #-}
pap :: Int -> Char -> Int
pap x _ = x
{-# NOINLINE pap #-}
main :: IO ()
main = do
assertSize 'a' 2
assertSize (Just ()) 2
assertSize (Nothing :: Maybe ()) 2
assertSize ((1,2) :: (Int,Int)) 3
assertSize ((1,2,3) :: (Int,Int,Int)) 4
assertSize (id :: Int -> Int) 1
assertSize (fst :: (Int,Int) -> Int) 1
assertSize (pap 1) 2
|
