[GHC] #11047: Provide call stacks in GHCi

[GHC]

#11047: Provide call stacks in GHCi
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        Reporter:  simonmar          |                Owner:  simonmar
            Type:  task              |               Status:  new
        Priority:  high              |            Milestone:  8.0.1
       Component:  GHCi              |              Version:  7.11
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #545, #4837       |  Differential Rev(s):  Phab:D1407
       Wiki Page:                    |
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Comment (by simonpj):

 I like the idea of running GHCi commands in a separate process.  But the
 division of responsibility between the two is quite obscure to me.
 Presumably we have a non-profiled GHC compiling profiled code, in the host
 process, that then squirts bytecode (?) to the assistant process which
 runs it?

 We have various unsolved semantic bugs in cost-centre semantics, which
 makes me feel uneasy.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11047#comment:7>
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