[GHC] #13142: Core simplifier crashes while building stack.
GHC
ghc-devs at haskell.org
Sat Jan 21 22:51:40 UTC 2017
#13142: Core simplifier crashes while building stack.
-------------------------------------+-------------------------------------
Reporter: jeiea | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 8.0.2
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
Type of failure: Compile-time | Unknown/Multiple
crash or panic | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
-------------------------------------+-------------------------------------
Changes (by RyanGlScott):
* os: Windows => Unknown/Multiple
Comment:
A couple of clarifications:
1. This isn't OS-specific - I can also reproduce it on Windows.
2. This has nothing to do with `stack` in particular, but rather one of
its dependencies, `store`. (Aside: `store` is gaining a reputation for
causing GHC bugs. See also #13059.)
3. This relies on building `store` with a debugging compiler (In fact, why
is `stack` using a debugging compiler in the first place? Weird.)
I tried to trim `store` down into as small of an example as I possibly
could. Here's what I came up with:
{{{#!hs
{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DefaultSignatures #-}
{-# LANGUAGE DeriveFunctor #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE EmptyCase #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE KindSignatures #-}
{-# LANGUAGE MagicHash #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE UnboxedTuples #-}
{-# LANGUAGE UndecidableInstances #-}
module StoreBug () where
import Data.Foldable (foldl')
import Data.Proxy
import Data.Word
import Foreign.Storable (Storable, sizeOf)
import GHC.Generics
import GHC.Types (Int(..))
import GHC.TypeLits
newtype Type = VarT Name
deriving Generic
data Name = Name OccName NameFlavour
deriving Generic
data NameFlavour
= NameS
| NameQ ModName
| NameU !Int
| NameL !Int
| NameG PkgName ModName
deriving Generic
newtype ModName = ModName String
deriving Generic
newtype PkgName = PkgName String
deriving Generic
newtype OccName = OccName String
deriving Generic
instance Store Type
instance Store Name
instance Store NameFlavour
instance Store ModName
instance Store OccName
instance Store PkgName
instance Store Char where
{-# INLINE size #-}
size = sizeStorableTy "Foreign.Storable.Storable GHC.Types.Char"
instance Store Int where
{-# INLINE size #-}
size = undefined
instance Store a => Store [a] where
size = sizeSequence
{-# INLINE size #-}
sizeSequence :: forall a. Store a => Size [a]
sizeSequence = VarSize $ \t ->
case size :: Size a of
ConstSize n -> n * (length t) + sizeOf (undefined :: Int)
VarSize f -> foldl' (\acc x -> acc + f x) (sizeOf (undefined ::
Int)) t
{-# INLINE sizeSequence #-}
class Store a where
size :: Size a
default size :: (Generic a, GStoreSize (Rep a)) => Size a
size = genericSize
{-# INLINE size #-}
data Size a
= VarSize (a -> Int)
| ConstSize !Int
getSizeWith :: Size a -> a -> Int
getSizeWith (VarSize f) x = f x
getSizeWith (ConstSize n) _ = n
{-# INLINE getSizeWith #-}
contramapSize :: (a -> b) -> Size b -> Size a
contramapSize f (VarSize g) = VarSize (g . f)
contramapSize _ (ConstSize n) = ConstSize n
{-# INLINE contramapSize #-}
combineSizeWith :: forall a b c. (c -> a) -> (c -> b) -> Size a -> Size b
-> Size c
combineSizeWith toA toB sizeA sizeB =
case (sizeA, sizeB) of
(VarSize f, VarSize g) -> VarSize (\x -> f (toA x) + g (toB x))
(VarSize f, ConstSize m) -> VarSize (\x -> f (toA x) + m)
(ConstSize n, VarSize g) -> VarSize (\x -> n + g (toB x))
(ConstSize n, ConstSize m) -> ConstSize (n + m)
{-# INLINE combineSizeWith #-}
sizeStorableTy :: forall a. Storable a => String -> Size a
sizeStorableTy ty = ConstSize (sizeOf (error msg :: a))
where
msg = "In Data.Store.storableSize: " ++ ty ++ "'s sizeOf evaluated its
argument."
{-# INLINE sizeStorableTy #-}
genericSize :: (Generic a, GStoreSize (Rep a)) => Size a
genericSize = contramapSize from gsize
{-# INLINE genericSize #-}
type family SumArity (a :: * -> *) :: Nat where
SumArity (C1 c a) = 1
SumArity (x :+: y) = SumArity x + SumArity y
class GStoreSize f where gsize :: Size (f a)
instance GStoreSize f => GStoreSize (M1 i c f) where
gsize = contramapSize unM1 gsize
{-# INLINE gsize #-}
instance Store a => GStoreSize (K1 i a) where
gsize = contramapSize unK1 size
{-# INLINE gsize #-}
instance GStoreSize U1 where
gsize = ConstSize 0
{-# INLINE gsize #-}
instance GStoreSize V1 where
gsize = ConstSize 0
{-# INLINE gsize #-}
instance (GStoreSize a, GStoreSize b) => GStoreSize (a :*: b) where
gsize = combineSizeWith (\(x :*: _) -> x) (\(_ :*: y) -> y) gsize
gsize
{-# INLINE gsize #-}
instance (SumArity (a :+: b) <= 255, GStoreSizeSum 0 (a :+: b))
=> GStoreSize (a :+: b) where
gsize = VarSize $ \x -> sizeOf (undefined :: Word8) + gsizeSum x
(Proxy :: Proxy 0)
{-# INLINE gsize #-}
class KnownNat n => GStoreSizeSum (n :: Nat) (f :: * -> *) where gsizeSum
:: f a -> Proxy n -> Int
instance (GStoreSizeSum n a, GStoreSizeSum (n + SumArity a) b, KnownNat n)
=> GStoreSizeSum n (a :+: b) where
gsizeSum (L1 l) _ = gsizeSum l (Proxy :: Proxy n)
gsizeSum (R1 r) _ = gsizeSum r (Proxy :: Proxy (n + SumArity a))
{-# INLINE gsizeSum #-}
instance (GStoreSize a, KnownNat n) => GStoreSizeSum n (C1 c a) where
gsizeSum x _ = getSizeWith gsize x
{-# INLINE gsizeSum #-}
}}}
And here's the panic I get when I compile it with a debug-enabled GHC
HEAD:
{{{
$ ~/Software/ghc5/inplace/bin/ghc-stage2 -fforce-recomp -O2 StoreBug.hs
[1 of 1] Compiling StoreBug ( StoreBug.hs, StoreBug.o )
WARNING: file compiler/simplCore/SimplCore.hs, line 666
Simplifier bailing out after 4 iterations [3866, 755, 220, 8]
Size = {terms: 1,490, types: 7,176, coercions: 4,808}
ghc-stage2: panic! (the 'impossible' happened)
(GHC version 8.1.20170121 for x86_64-unknown-linux):
ASSERT failed!
in_scope InScope {wild_00 wild_X25 g1_a33l g2_a33m $cfrom_a47d
$cto_a47F $cfrom_a48a $cto_a48C $cfrom_a496 $cto_a4bk
$cfrom_a4dA
$cto_a4e2 $cfrom_a4ew $cto_a4fb $cfrom_a4fS $cto_a4gk
$cp1GStoreSizeSum_a4gV $cgsizeSum_a4gX
$cp1GStoreSizeSum_a4hh
$cgsizeSum_a4hj $cgsize_a4hV $cgsize_a4ix $csize_a4iU
$csize_a4j2
$csize_a4jb $csize_a4jj $csize_a4jw $csize_a4jJ
$csize_a4jW
$csize_a4k9 $csize_a4km $cgsize_a4kD $cgsize_a4kY
$cgsize_a4l6
$cgsize_a4li $dGStoreSize_a4qQ $dGStoreSize_a4qW
$dGStoreSize_a4r2
$dGStoreSize_a4r8 $dGStoreSize_a4BJ $dGStoreSize_a4BS
ww2_a5CX
sizeSequence genericSize $tc'ModName $tcModName
$tc'PkgName
$tcPkgName $tc'NameS $tc'NameQ $tc'NameU $tc'NameL
$tc'NameG
$tcNameFlavour $tc'OccName $tcOccName $tc'Name $tcName
$tc'VarT
$tcType $tc'VarSize $tc'ConstSize $tcSize
$tcGStoreSize
$tc'C:GStoreSize $fGStoreSize:*: $fGStoreSizeV1
$fGStoreSizeU1
$fGStoreSizeM1 $tcStore $dmsize $tc'C:Store
$fGStoreSizeK1
$fStore[] $fStoreInt $fStoreChar $fStorePkgName
$fStoreOccName
$fStoreModName $fStoreNameFlavour $fStoreName
$fStoreType
$tcGStoreSizeSum $tc'C:GStoreSizeSum
$fGStoreSizeSumnM1
$fGStoreSizeSumn:+: $fGStoreSize:+: $fGenericModName
$fGenericPkgName $fGenericNameFlavour $fGenericOccName
$fGenericName $fGenericType $trModule $cto_s4Pr
$cfrom_s4Ps
$cfrom_s4Pv $cto_s4Pw $cfrom_s4Px $cfrom_s4PF
$cto_s4PG $cfrom_s4PH
$cto_s4PI $cfrom_s4PJ $trModule_s50k $trModule_s50l
$trModule_s50m
$trModule_s50n $tc'ModName_s50o $tc'ModName_s50p
$tcModName_s50q
$tcModName_s50r $tc'PkgName_s50s $tc'PkgName_s50t
$tcPkgName_s50u
$tcPkgName_s50v $tc'NameG_s50w $tc'NameG_s50x
$tc'NameL_s50y
$tc'NameL_s50z $tc'NameU_s50A $tc'NameU_s50B
$tc'NameQ_s50C
$tc'NameQ_s50D $tc'NameS_s50E $tc'NameS_s50F
$tcNameFlavour_s50G
$tcNameFlavour_s50H $tc'OccName_s50I $tc'OccName_s50J
$tcOccName_s50K $tcOccName_s50L $tc'Name_s50M
$tc'Name_s50N
$tcName_s50O $tcName_s50P $tc'VarT_s50Q $tc'VarT_s50R
$tcType_s50S
$tcType_s50T $tc'ConstSize_s50U $tc'ConstSize_s50V
$tc'VarSize_s50W
$tc'VarSize_s50X $tcSize_s50Y $tcSize_s50Z
$tc'C:GStoreSize_s510
$tc'C:GStoreSize_s511 $tcGStoreSize_s512
$tcGStoreSize_s513
$tc'C:Store_s514 $tc'C:Store_s515 $tcStore_s516
$tcStore_s517
$tc'C:GStoreSizeSum_s518 $tc'C:GStoreSizeSum_s519
$tcGStoreSizeSum_s51a $tcGStoreSizeSum_s51b
$sgenericSize_s59c
$sgenericSize_s59f $sgenericSize_s59i
$sgenericSize_s59l
$sgenericSize_s59o $sgenericSize_s59r $sgsize_s59B
$sgsize_s59D
$sgsize_s59F $sgsize_s59H $sgsize_s59J $sgsize_s59L
lvl_s5bw
lvl_s5bx $csize_s5i3 $dGStoreSize_s5jy
$dGStoreSize_s5jM
$dGStoreSize_s5k0 $dGStoreSize_s5kc $dGStoreSize_s5lQ
$dGStoreSize_s5od $dGStoreSize_s5rC g_s5tx g_s5tA
g_s5tD
$dGStoreSize_s5u4 g_s5u5 $dGStoreSize_s5uv
$dGStoreSize_s5uZ
$sgenericSize_s5v0 $csize_s5v2 g_s5vy
$sgenericSize_s5vA
$csize_s5vF $w$j_s5Wr a_s5Ws ww_s5Ww ww_s5Wx $wg_s5WC
$w$dGStoreSize_s5WI $wg_s5WT lvl_s65L lvl_s65M
lvl_s65N lvl_s65O
lvl_s65P lvl_s65Q lvl_s65R lvl_s65S lvl_s65T lvl_s65U
lvl_s65W
lvl_s65X lvl_s65Y lvl_s65Z lvl_s660 lvl_s661 lvl_s662
lvl_s663
lvl_s664 lvl_s665 lvl_s666 lvl_s667 lvl_s66c lvl_s66d
lvl_s66e
lvl_s66f lvl_s66g lvl_s66h lvl_s66i lvl_s66j lvl_s66k
lvl_s66l
lvl_s66m lvl_s66n lvl_s66s lvl_s66t lvl_s66u lvl_s66v
lvl_s66w
lvl_s66x lvl_s66y lvl_s66z lvl_s66A lvl_s66B lvl_s66C
lvl_s66D
lvl_s66I lvl_s66J lvl_s66K lvl_s66L $s$w$j_s69S
$s$w$j_s69T
$s$w$j_s69U}
tenv []
tenvFVs []
cenv [s69R :-> sg_s69R]
cenvFVs [s69R :-> sg_s69R]
tys [R]
cos []
Call stack:
CallStack (from HasCallStack):
prettyCurrentCallStack, called at
compiler/utils/Outputable.hs:1166:58 in ghc:Outputable
callStackDoc, called at compiler/utils/Outputable.hs:1215:22 in
ghc:Outputable
assertPprPanic, called at compiler/types/TyCoRep.hs:2078:56 in
ghc:TyCoRep
checkValidSubst, called at compiler/types/TyCoRep.hs:2111:17 in
ghc:TyCoRep
substTy, called at compiler/types/OptCoercion.hs:345:12 in
ghc:OptCoercion
Call stack:
CallStack (from HasCallStack):
prettyCurrentCallStack, called at
compiler/utils/Outputable.hs:1166:58 in ghc:Outputable
callStackDoc, called at compiler/utils/Outputable.hs:1170:37 in
ghc:Outputable
pprPanic, called at compiler/utils/Outputable.hs:1213:5 in
ghc:Outputable
assertPprPanic, called at compiler/types/TyCoRep.hs:2078:56 in
ghc:TyCoRep
checkValidSubst, called at compiler/types/TyCoRep.hs:2111:17 in
ghc:TyCoRep
substTy, called at compiler/types/OptCoercion.hs:345:12 in
ghc:OptCoercion
}}}
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13142#comment:2>
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