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Re: jit interface and jit reader
- From: Tony Simpson <agjasimpson at gmail dot com>
- To: Frank Tetzel <s1445051 at mail dot zih dot tu-dresden dot de>
- Cc: gdb at sourceware dot org
- Date: Tue, 22 Jan 2019 11:20:58 +0000
- Subject: Re: jit interface and jit reader
- References: <20190118115004.1a51eefc@archvm> <20190121145310.36158a70@archvm>
I think I ran into the same problem a couple of years ago. I fixed my
I've forgotten the details but I remember I got it working with my patch -
here is the commit message for 3c0e5d45f727d5ef98b681103954820c8fbbd700
* Named blocks not appearing as functions - can't break on functions;
* Pending breakpoints on JIT'd code not being resolved;
* GDB goes into an infinit loop with more than one JIT block in a
* Unwinder function not being called.
Hope this helps. Best Regards,
On Mon, 21 Jan 2019 at 13:53, Frank Tetzel <firstname.lastname@example.org>
> > I have trouble getting GDB's jit interface to work. I'm trying to make
> > application using AsmJit  easier to debug by being able to break
> > when entering jitted code. As AsmJit is just an assembler returning a
> > function pointer to the generated code, I do not want to create an
> > object file for it. That is why I'm trying to use jit-reader, but the
> > symbol does not seem to show up in GDB and a pending breakpoint is
> > never hit.
> > What am I doing wrong? I attached two files: gdbjit.cpp is talking to
> > GDB via the jit interface. gdbjit-reader.c is the jit reader for GDB
> > which I compile to a shared object and load in GDB with
> > jit-reader-load.
> > It does not implement unwind and get_frame_id. Do I need these
> > functions? unwind is called sometimes. Is there a minimal example
> > somewhere which implements jit reader?
> >  https://github.com/asmjit/asmjit
> I looked at GDB's source code a bit and found a minimal example in
> The problem is also visible there: I can follow the indirect call into
> the generated code. In TUI-mode, the instructions belonging to the
> function have the correct symbol+offset. backtrace shows the function
> name as well.
> But, I cannot set a breakpoint with the function name. Nor can I use
> the command disassemble, only the disassemble view in TUI works.
> How can I register the address range as a proper function?
> Best regards,