Hi all,
I'm using the JIT capabilities of LLVM. But so far, I've been unable to
use
the debug capabilities of LLVM in conjunction with the JIT. The problematic
scenario goes as follow :
- Emit some IR with debug infos.
- Install hooks to get back into some codepath that I do not wish to
codegen at this stage.
- JIT the method. This require to finalize the DIBuilder to complete the
emission of debug metadata.
- Later on, emit IR for some of the missing branches. Here the problem
surface :
- Without debug infos, the codegen for this specific method can be
invalidated and redone, all is fine.
- With debug infos, the metadata have been finalized already, and it
doesn't seems that it is possible to revert this
Is there a way to make that work ? If not, is there a patch I can work on
to make that work ?
Thank in advance,
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Abstractly, (I don't get inside this code as much as I should) debug info
works on a translation-unit basis, not a function basis, so regenerating a
single function's debug info is not a natural or well-isolated operation.
You might have to emit each function as its own LLVM module and re-JIT the
module?
People more deeply familiar with how the metadata stuff works might be able to
offer better suggestions.
--paulr
From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of deadal
nix via llvm-dev
Sent: Friday, October 02, 2015 11:38 PM
To: llvm-dev
Subject: [llvm-dev] Editing metadata
Hi all,
I'm using the JIT capabilities of LLVM. But so far, I've been unable to
use the debug capabilities of LLVM in conjunction with the JIT. The problematic
scenario goes as follow :
- Emit some IR with debug infos.
- Install hooks to get back into some codepath that I do not wish to codegen at
this stage.
- JIT the method. This require to finalize the DIBuilder to complete the
emission of debug metadata.
- Later on, emit IR for some of the missing branches. Here the problem surface
:
- Without debug infos, the codegen for this specific method can be
invalidated and redone, all is fine.
- With debug infos, the metadata have been finalized already, and it
doesn't seems that it is possible to revert this
Is there a way to make that work ? If not, is there a patch I can work on to
make that work ?
Thank in advance,
-------------- next part --------------
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This is about the best idea. There's no way to take the non-temporary md nodes back to temporary. -eric On Mon, Oct 5, 2015 at 10:12 AM Robinson, Paul via llvm-dev < llvm-dev at lists.llvm.org> wrote:> Abstractly, (I don't get inside this code as much as I should) debug info > works on a translation-unit basis, not a function basis, so regenerating a > single function's debug info is not a natural or well-isolated operation. > > You might have to emit each function as its own LLVM module and re-JIT the > module? > > People more deeply familiar with how the metadata stuff works might be > able to offer better suggestions. > > --paulr > > > > *From:* llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] *On Behalf Of *deadal > nix via llvm-dev > *Sent:* Friday, October 02, 2015 11:38 PM > *To:* llvm-dev > *Subject:* [llvm-dev] Editing metadata > > > > Hi all, > > I'm using the JIT capabilities of LLVM. But so far, I've been unable to > use the debug capabilities of LLVM in conjunction with the JIT. The > problematic scenario goes as follow : > > - Emit some IR with debug infos. > > - Install hooks to get back into some codepath that I do not wish to > codegen at this stage. > > - JIT the method. This require to finalize the DIBuilder to complete the > emission of debug metadata. > > - Later on, emit IR for some of the missing branches. Here the problem > surface : > > - Without debug infos, the codegen for this specific method can be > invalidated and redone, all is fine. > > - With debug infos, the metadata have been finalized already, and it > doesn't seems that it is possible to revert this > > Is there a way to make that work ? If not, is there a patch I can work on > to make that work ? > > Thank in advance, > _______________________________________________ > LLVM Developers mailing list > llvm-dev at lists.llvm.org > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20151005/7936a55e/attachment.html>