[GHC] #15092: Optionally bounds-check primops

[GHC]

#15092: Optionally bounds-check primops
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           Reporter:  dfeuer         |             Owner:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.2.2
  (CodeGen)                          |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 It would be awfully nice if there were a way to optionally get bounds-
 checked versions of array primitives. The idea would be that if GHC is
 compiled with a bounds-checking option, then the code generator would use
 primops that verify indices are in bounds. Based on
 [https://mail.haskell.org/pipermail/haskell-cafe/2018-April/128992.html a
 question by Henning Thielemann], I suspect such a feature would get some
 use.

 The biggest challenge: `SomeException`, `Typeable`, `Show`, `String`,
 `CallStack`, etc., all live in an entirely different universe than the
 primops, so it's not exactly obvious how to get started. I don't know if
 it would be possible to inject references to such things into a lower
 level. Sounds hard, but maybe it's possible.

 An alternative, probably much simpler, approach would be to crash hard
 with an error message instead of trying to throw a proper exception.
 Ideally, the error message would include the name of the primop and (for
 modules compiled with profiling) some call stack info.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15092>
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