[GHC] #15832: returnIO/bindIO destroys runtime explicit stack information in some cases

[GHC]

#15832: returnIO/bindIO destroys runtime explicit stack information in some cases
-------------------------------------+-------------------------------------
        Reporter:  infinity0         |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.6.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by infinity0):

 Adding `-debug` and `-Dp` reveals that something is preventing the
 relevant cost-centre from being added to the relevant CAF cost-centre-
 stacks. But this is necessary in order for the logic in fprintCCS_stderr
 to find the subsequent stacks, to print the "evaluated by" stuff.

 {{{
 $ sh build.sh
 [1 of 1] Compiling Main             ( Test-good.hs, Test-good.o )
 Linking Test-good ...
 7facde5a7740: pushing main on <Main.CAF:main>
 Appending <> to <Main.main,Main.CAF:main>
 7facde5a7740: pushing main on <Main.main,Main.CAF:main>
 Appending <Main.main> to <Main.main,Main.main,Main.CAF:main>
 7facde5a7740: pushing main on <Main.main,Main.CAF:main>
 Appending <Main.main> to <Main.main,Main.main,Main.CAF:main>
 7facde5a7740: pushing main on <Main.main,Main.main,Main.CAF:main>
 Appending <Main.main,Main.main> to
 <Main.main,Main.main,Main.main,Main.CAF:main>
 7facde5a7740: pushing main on <Main.main>
 7facde5a7740: pushing main on <Main.main,Main.main>
 7facde5a7740: pushing main on
 <Main.main,Main.main,Main.main,Main.CAF:main>
 7facde5a7740: pushing main on
 <Main.main,Main.main,Main.main,Main.main,Main.CAF:main>
 *** Exception (reporting due to +RTS -xc): (THUNK_2_0), stack trace:
 [.. complete stack trace ..]

 [1 of 1] Compiling Main             ( Test-bad.hs, Test-bad.o )
 Linking Test-bad ...
 7febf2b72740: pushing main on <Main.CAF:main>
 Appending <> to <Main.main,Main.CAF:main>
 7febf2b72740: pushing main on <Main.main,Main.CAF:main>
 Appending <Main.main> to <Main.main,Main.main,Main.CAF:main>
 Appending <Main.main> to <Main.main,Main.CAF:main>
 7febf2b72740: pushing main on <Main.main>
 7febf2b72740: pushing main on <Main.main>
 7febf2b72740: pushing main on <Main.main,Main.main>
 7febf2b72740: pushing main on <Main.main,Main.main,Main.main>
 *** Exception (reporting due to +RTS -xc): (THUNK_2_0), stack trace:
 [.. incomplete stack trace ..]

 }}}

 (On Debian I also have to add `-threaded -rtsopts` because we have a
 `libHSrts_thr_debug_p.a` but not a plain `libHSrts_debug_p.a` for some
 reason.)

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15832#comment:3>
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