[GHC] #16286: Continuations are not labelled in the binaries even with -g3

[GHC]

#16286: Continuations are not labelled in the binaries even with -g3
-------------------------------------+-------------------------------------
           Reporter:  osa1           |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:
           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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 Any program would work as a reproducer, but here's what I'm using
 currently:

 {{{
 {-# LANGUAGE StaticPointers #-}

 module Main where

 import Control.Concurrent
 import System.Mem

 nats :: [Int]
 nats = [0 .. ]

 main = do
   let z = nats !! 400
   print z
   performGC
   threadDelay 1000000
   print (nats !! 900)
 }}}

 If I do `printStack` every time the GC copies a stack I sometimes see
 stack frames like

 {{{
 RET_SMALL (0x535568)
 }}}

 but in gdb or objdump output I can't find a symbol at that address, even
 when the program is built with `-g3`. When I print the location as
 `StgInfoTable*` I can see that it's a valid info table so `0x535578`
 should be labelled as `foo_info`.

 In the objdump output I see that the location is shown as this:

 {{{
   535563:       0f 1f 44 00 00          nopl   0x0(%rax,%rax,1)
         ...
   535570:       1e                      (bad)
   535571:       00 00                   add    %al,(%rax)
   535573:       00 00                   add    %al,(%rax)
   535575:       00 00                   add    %al,(%rax)
   535577:       00 bb e9 e2 85 00       add    %bh,0x85e2e9(%rbx)
   53557d:       48 83 c5 08             add    $0x8,%rbp
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16286>
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