typePrimRep invariants

Discussion:

Csaba Hruska

2018-11-30 21:47:46 UTC

Hi,

I'd like to export the PrimRep of every binder and data con from Haskell
modules.

I have a modified GHC 8.6 which serializes the PrimRep for every binder
during the compilation. It uses the *typePrimRep* function. When my
customised GHC compiles the base library it always thows the following
error for the *libraries/base/GHC/Err.hs*
<https://github.com/grin-tech/ghc-grin/blob/master/ghc-8.6.2/libraries/base/GHC/Err.hs>
module.

1. Does that mean that there is hidden requirement for typePrimRep input?
2. If so what are the restrictions?
3. Can you see anything in the Err module source code that could not be
a proper input for typePrimRep function?

Thanks,
Csaba

"inplace/bin/ghc-stage1" -hisuf hi -osuf o -hcsuf hc -static -H32m -O
-Wall -this-unit-id base-4.12.0.0 -hide-all-packages -i
-ilibraries/base/. -ilibraries/base/dist-install/build
-Ilibraries/base/dist-install/build
-ilibraries/base/dist-install/build/./autogen
-Ilibraries/base/dist-install/build/./autogen -Ilibraries/base/include
-Ilibraries/base/dist-install/build/include
-optP-DOPTIMISE_INTEGER_GCD_LCM -optP-include
-optPlibraries/base/dist-install/build/./autogen/cabal_macros.h -package-id
ghc-prim-0.5.3 -package-id integer-gmp-1.0.2.0 -package-id rts
-this-unit-id base -Wcompat -Wnoncanonical-monad-instances -XHaskell2010
-O2 -haddock -no-user-package-db -rtsopts -Wno-trustworthy-safe
-Wno-deprecated-flags -Wnoncanonical-monad-instances -odir
libraries/base/dist-install/build -hidir libraries/base/dist-install/build
-stubdir libraries/base/dist-install/build -split-sections -dynamic-too -c
libraries/base/./GHC/Err.hs -o libraries/base/dist-install/build/GHC/Err.o
-dyno libraries/base/dist-install/build/GHC/Err.dyn_o
ghc-stage1: panic! (the 'impossible' happened)
(GHC version 8.6.2 for x86_64-unknown-linux):
runtimeRepPrimRep
typePrimRep (a_a1ML :: TYPE r_a1MK)
r_a1MK
Call stack:
CallStack (from HasCallStack):
callStackDoc, called at compiler/utils/Outputable.hs:1160:37 in
ghc:Outputable
pprPanic, called at compiler/simplStg/RepType.hs:358:5 in
ghc:RepType

Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug

libraries/base/ghc.mk:4: recipe for target
'libraries/base/dist-install/build/GHC/Err.o' failed
make[1]: *** [libraries/base/dist-install/build/GHC/Err.o] Error 1
Makefile:122: recipe for target 'all' failed
make: *** [all] Error 2

Csaba Hruska

2018-11-30 22:08:44 UTC

Permalink

Is this problem related to the following?

{- Note [Error and friends have an "open-tyvar" forall]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
'error' and 'undefined' have types
error :: forall (v :: RuntimeRep) (a :: TYPE v). String -> a
undefined :: forall (v :: RuntimeRep) (a :: TYPE v). a
Notice the runtime-representation polymorphism. This ensures that
"error" can be instantiated at unboxed as well as boxed types.
This is OK because it never returns, so the return type is irrelevant.
Hi,
I'd like to export the PrimRep of every binder and data con from Haskell
modules.
I have a modified GHC 8.6 which serializes the PrimRep for every binder
during the compilation. It uses the *typePrimRep* function. When my
customised GHC compiles the base library it always thows the following
error for the *libraries/base/GHC/Err.hs*
<https://github.com/grin-tech/ghc-grin/blob/master/ghc-8.6.2/libraries/base/GHC/Err.hs>
module.
1. Does that mean that there is hidden requirement for typePrimRep input?
2. If so what are the restrictions?
3. Can you see anything in the Err module source code that could not
be a proper input for typePrimRep function?
Thanks,
Csaba
"inplace/bin/ghc-stage1" -hisuf hi -osuf o -hcsuf hc -static -H32m -O
-Wall -this-unit-id base-4.12.0.0 -hide-all-packages -i
-ilibraries/base/. -ilibraries/base/dist-install/build
-Ilibraries/base/dist-install/build
-ilibraries/base/dist-install/build/./autogen
-Ilibraries/base/dist-install/build/./autogen -Ilibraries/base/include
-Ilibraries/base/dist-install/build/include
-optP-DOPTIMISE_INTEGER_GCD_LCM -optP-include
-optPlibraries/base/dist-install/build/./autogen/cabal_macros.h -package-id
ghc-prim-0.5.3 -package-id integer-gmp-1.0.2.0 -package-id rts
-this-unit-id base -Wcompat -Wnoncanonical-monad-instances -XHaskell2010
-O2 -haddock -no-user-package-db -rtsopts -Wno-trustworthy-safe
-Wno-deprecated-flags -Wnoncanonical-monad-instances -odir
libraries/base/dist-install/build -hidir libraries/base/dist-install/build
-stubdir libraries/base/dist-install/build -split-sections -dynamic-too -c
libraries/base/./GHC/Err.hs -o libraries/base/dist-install/build/GHC/Err.o
-dyno libraries/base/dist-install/build/GHC/Err.dyn_o
ghc-stage1: panic! (the 'impossible' happened)
runtimeRepPrimRep
typePrimRep (a_a1ML :: TYPE r_a1MK)
r_a1MK
callStackDoc, called at compiler/utils/Outputable.hs:1160:37 in
ghc:Outputable
pprPanic, called at compiler/simplStg/RepType.hs:358:5 in
ghc:RepType
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
libraries/base/ghc.mk:4: recipe for target
'libraries/base/dist-install/build/GHC/Err.o' failed
make[1]: *** [libraries/base/dist-install/build/GHC/Err.o] Error 1
Makefile:122: recipe for target 'all' failed
make: *** [all] Error 2

Csaba Hruska

2018-12-01 21:37:31 UTC

Permalink

I've got the answer at #ghc irc channel.
With resultIsLevPoly it is possible to filter out the problematic types.

Regards,
Csaba

Post by Csaba Hruska
Is this problem related to the following?