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

Bumping thread, this is still a problem for me. I wonder if this ever worked. I should try this with older GHCs. Ömer Sergei Azovskov , 26 Şub 2019 Sal, 19:21 tarihinde şunu yazdı:

Hey!

Unfortunately, I'm not a big expert in gdb and debugging ghc runtime. I stripped some auto generated symbols from the symtab but they can still be found in dwarf section. I don't know how to force gdb to show them but you can manually check via dwarfdump. ________________________________ From: Ömer Sinan Ağacan Sent: Sunday, February 10, 2019 6:45 PM To: Simon Marlow Cc: ghc-devs; Sergei Azovskov Subject: Re: How do I find out which info table a continuation belongs to?

I'm already using -g3. Here's my build.mk:

BuildFlavour = quick

ifneq "$(BuildFlavour)" "" include mk/flavours/$(BuildFlavour).mk endif

GhcRtsHcOpts += -O0 -g3 SRC_HC_OPTS += -g3 GhcStage1HcOpts += -g3 GhcStage2HcOpts += -g3 GhcLibHcOpts += -g3

STRIP_CMD = :

Ömer

Simon Marlow , 10 Şub 2019 Paz, 19:00 tarihinde şunu yazdı:

...

I believe this is due to https://urldefense.proofpoint.com/v2/url?u=https-3A__phabricator.haskell.org_D4722&d=DwIFaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=kdITsLFp8oDGMKQlc9eIzA&m=TC61xap_n2utc37GJd4nKe0d_swgwMyqoHVKekcPDZk&s=I_8-wOL9DBs5msIWONBC1IwDvNFG-rXrOgrXVhBqt6Q&e=

(cc Sergei Azovskov)

I'm a bit surprised that gdb isn't showing anything though, it should know that the address corresponds to a temporary symbol like `.L1234`. Perhaps you need to compile with -g to make this work, I'm not sure.

On Sun, 10 Feb 2019 at 07:50, Ömer Sinan Ağacan wrote:

...

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 _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org https://urldefense.proofpoint.com/v2/url?u=http-3A__mail.haskell.org_cgi-2Dbin_mailman_listinfo_ghc-2Ddevs&d=DwIFaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=kdITsLFp8oDGMKQlc9eIzA&m=TC61xap_n2utc37GJd4nKe0d_swgwMyqoHVKekcPDZk&s=OIXAtMjQkAnHAverwOpWQrKM1GIy-Eo85s3wxcnOqfU&e=