[GHC] #5654: Profiling semantics bug

[GHC]

#5654: Profiling semantics bug
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        Reporter:  simonmar          |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  low               |            Milestone:  8.2.1
       Component:  Profiling         |              Version:  7.2.1
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
                                     |  profiling/should_run/scc004
      Blocked By:                    |             Blocking:
 Related Tickets:  #10007            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Simon Marlow <marlowsd@…>):

 In [changeset:"3a18baff06abc193569b1b76358da26375b3c8d6/ghc" 3a18baf/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="3a18baff06abc193569b1b76358da26375b3c8d6"
 More fixes for #5654

 * In stg_ap_0_fast, if we're evaluating a thunk, the thunk might
   evaluate to a function in which case we may have to adjust its CCS.

 * The interpreter has its own implementation of stg_ap_0_fast, so we
   have to do the same shenanigans with creating empty PAPs and copying
   PAPs there.

 * GHCi creates Cost Centres as children of CCS_MAIN, which enterFunCCS()
   wrongly assumed to imply that they were CAFs.  Now we use the is_caf
   flag for this, which we have to correctly initialise when we create a
   Cost Centre in GHCi.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5654#comment:22>
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