Re: How do I find out which info table a continuation belongs to?

2 Sep 2019


      Fixed in https://gitlab.haskell.org/ghc/ghc/merge_requests/1654

Ömer

Ömer Sinan Ağacan , 10 Şub 2019 Paz, 10:49
tarihinde şunu yazdı:
...
I'm currently working on a bug and one of the things I often want to know is
what's on the stack. The problem is I can't see labels of continuations so the
information is really useless. Example:
>>> call printStack(((StgTSO*)0x42000e0198)->stackobj)
    0x42000c8788: RET_SMALL (0x512d70)
    0x42000c8790: RET_SMALL (0x40edf0)
       stk[5] (0x42000c8798) = 0x7b3938
    0x42000c87a0: CATCH_FRAME(0x735a98,0x7d3ff2)
    0x42000c87b8: STOP_FRAME(0x7311b8)
(I modified the printer to print stack locations when printing stacks)
Here I need to know which info table the RET_SMALLs return to. Normally I do
this for other kinds of closures:
>>> print ((StgClosure*)...)->header.info
    $15 = (const StgInfoTable *) 0x404dc0 
But for continuations that doesn't work:
>>> print ((StgClosure*)0x42000c8788)->header.info
    $11 = (const StgInfoTable *) 0x512d80
    >>> info symbol 0x512d80
    No symbol matches 0x512d80.
Anyone know how to make this work? Can I maybe mark the continuations label in
the generated assembly somehow to make those labels available in gdb?
Thanks
Ömer