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  • Glasgow Haskell CompilerGlasgow Haskell Compiler
  • GHCGHC
  • Issues
  • #2594

Wrong size for Int in arguments to functions wrapped to FunPtr by FFI wrappers (on 64-bit machine)

An operation

  foo :: Int -> IO ()

is wrapped to a function pointer ptr :: FunPtr (Int -> IO ()) (via an FFI wrapper). If you pass this pointer to a C function, that calls it with a negative parameter (e.g. -1), the operation is executed with a positive parameter (something near 4294967295 ( == 2 ^ 32 - 1)).

This works correctly on x86 (32-bit).

See attachment for an example.

Trac metadata
Trac field Value
Version 6.8.3
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
Differential revisions
BlockedBy
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Blocking
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Operating system
Architecture x86_64 (amd64)
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