lost the way on how to trace JIT codes

I use this version: llvmpipe (LLVM 14.0.0, 256 bits Type: CPU API: 1.3.246)
as a backed vulkan engine. When I trace the whole pipeline that draws a
picture.    I can trace all the C level codes as following hints:

#0  lp_setup_draw_elements (vbr=0x555555bcfe30, indices=0x555555bcdf10,
nr=1023) at ../src/gallium/drivers/llvmpipe/lp_setup_vbuf.c:238
#1  0x00007ffff61d0707 in draw_pt_emit (emit=0x555555bcfce0,
vert_info=0x7fffd966e718, prim_info=0x7fffd966e8d8) at
../src/gallium/auxiliary/draw/draw_pt_emit.c:197
#2  0x00007ffff61cc208 in emit (emit=0x555555bcfce0,
vert_info=0x7fffd966e718, prim_info=0x7fffd966e8d8) at
../src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline_llvm.c:541
#3  0x00007ffff61cbe4c in llvm_pipeline_generic (middle=0x555555bcfbd0,
fetch_info=0x0, in_prim_info=0x7fffd966e8d8) at
../src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline_llvm.c:759
#4  0x00007ffff61ca5fc in llvm_middle_end_run (middle=0x555555bcfbd0,
fetch_elts=0x555555bccf10, fetch_count=683, draw_elts=0x555555bcdf10,
draw_count=1023, prim_flags=2) at
../src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline_llvm.c:812
#5  0x00007ffff6130283 in vsplit_flush_cache (vsplit=0x555555bcced0,
flags=2) at ../src/gallium/auxiliary/draw/draw_pt_vsplit.c:78
#6  0x00007ffff6131236 in vsplit_segment_cache_uint (vsplit=0x555555bcced0,
flags=2, istart=0, icount=1023, spoken=0 '\000', ispoken=0, close=0 '\000',
iclose=0) at ../src/gallium/auxiliary/draw/draw_pt_vsplit_tmp.h:163
#7  0x00007ffff6130f8c in vsplit_segment_simple_uint
(vsplit=0x555555bcced0, flags=2, istart=0, icount=1023) at
../src/gallium/auxiliary/draw/draw_pt_vsplit_tmp.h:173
#8  0x00007ffff612f4cd in vsplit_run_uint (frontend=0x555555bcced0,
start=0, count=5529600) at
../src/gallium/auxiliary/draw/draw_split_tmp.h:106
#9  0x00007ffff6122e96 in draw_pt_arrays (draw=0x555555b96920,
prim=PIPE_PRIM_TRIANGLES, index_bias_varies=true, draw_info=0x7fffd966ec70,
num_draws=1) at ../src/gallium/auxiliary/draw/draw_pt.c:161
#10 0x00007ffff6122995 in draw_instances (draw=0x555555b96920,
drawid_offset=0, info=0x555555b7fb60, draws=0x7fffd966ec70, num_draws=1) at
../src/gallium/auxiliary/draw/draw_pt.c:485
#11 0x00007ffff6122689 in draw_vbo (draw=0x555555b96920,
info=0x555555b7fb60, drawid_offset=0, indirect=0x0, draws=0x7fffd966ec70,
num_draws=1, patch_vertices=0 '\000') at
../src/gallium/auxiliary/draw/draw_pt.c:619
#12 0x00007ffff60757ee in llvmpipe_draw_vbo (pipe=0x555555b8db40,
info=0x555555b7fb60, drawid_offset=0, indirect=0x0, draws=0x7fffd966ec70,
num_draws=1) at ../src/gallium/drivers/llvmpipe/lp_draw_arrays.c:150
#13 0x00007ffff5c71083 in handle_draw_indexed (cmd=0x555555dca790,
state=0x555555b7faf0) at
../src/gallium/frontends/lavapipe/lvp_execute.c:2725
#14 0x00007ffff5c6f1e0 in lvp_execute_cmd_buffer
(cmd_buffer=0x555555b78520, state=0x555555b7faf0, print_cmds=false) at
../src/gallium/frontends/lavapipe/lvp_execute.c:4324
#15 0x00007ffff5c6ef10 in lvp_execute_cmds (device=0x555555b7e5f0,
queue=0x555555b7f8e0, cmd_buffer=0x555555b78520) at
../src/gallium/frontends/lavapipe/lvp_execute.c:4621
#16 0x00007ffff5c682ba in lvp_queue_submit (vk_queue=0x555555b7f8e0,
submit=0x555555dccb80) at
../src/gallium/frontends/lavapipe/lvp_device.c:1548
#17 0x00007ffff5d651fd in vk_queue_submit_final (queue=0x555555b7f8e0,
submit=0x555555dccb80) at ../src/vulkan/runtime/vk_queue.c:377
#18 0x00007ffff5d67eef in vk_queue_submit_thread_func
(_data=0x555555b7f8e0) at ../src/vulkan/runtime/vk_queue.c:490
#19 0x00007ffff5d45522 in impl_thrd_routine (p=0x555555aa1ee0) at
../src/c11/impl/threads_posix.c:67
#20 0x00007ffff7894b43 in start_thread (arg=<optimized out>) at
./nptl/pthread_create.c:442
#21 0x00007ffff7926a00 in clone3 () at
../sysdeps/unix/sysv/linux/x86_64/clone3.S:81


But when I want to make clear what this method's function :

/* Run vertex fetch shader */
      clipped = fpme->current_variant->jit_func(&fpme->llvm->jit_context,
                                                llvm_vert_info.verts,
                                                draw->pt.user.vbuffer,
                                                fetch_info->count,
                                                start,
                                                fpme->vertex_size,
                                                draw->pt.vertex_buffer,
                                                draw->instance_id,
                                                vertex_id_offset,
                                                draw->start_instance,
                                                elts,
                                                draw->pt.user.drawid,
                                                draw->pt.user.viewid);
I can't step into this function with gdb and can't find any hints on how to
fill this llvm_vert_info.verts in it.  Appreciate any comments.

Regards

Nelson