[GHC] #7718: ios patch no 8: adjustor pools

[GHC]

#7718: ios patch no 8: adjustor pools
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  Reporter:  StephenBlackheath  |          Owner:         
      Type:  feature request    |         Status:  patch  
  Priority:  normal             |      Milestone:  7.8.1  
 Component:  Compiler           |        Version:  7.7    
Resolution:                     |       Keywords:         
        Os:  Other              |   Architecture:  arm    
   Failure:  None/Unknown       |     Difficulty:  Unknown
  Testcase:                     |      Blockedby:         
  Blocking:  7724               |        Related:         
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Comment(by simonmar):

 Ok, so the ARM version has an assumption that `ffi_closure_alloc()`
 returns an `ffi_closure*`, which isn't necessarily the case on the other
 architectures, and in the RTS we're assuming that we can write the memory
 it returns.

 Another way to fix this seems to be to require `freeExec()` take the
 writable address, and make it the caller's responsibility to store the
 writable address somewhere.  When we're using `libffi` we could store the
 writable address after the `ffi_closure`, for example.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7718#comment:21>
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