Function read_function_info

Source/ThirdParty/tracy/libbacktrace/dwarf.cpp:3821–3901

   through the whole unit looking for function tags.  */

static void
read_function_info (struct backtrace_state *state, struct dwarf_data *ddata,
		    const struct line_header *lhdr,
		    backtrace_error_callback error_callback, void *data,
		    struct unit *u, struct function_vector *fvec,
		    struct function_addrs **ret_addrs,
		    size_t *ret_addrs_count)
{
  struct function_vector lvec;
  struct function_vector *pfvec;
  struct dwarf_buf unit_buf;
  struct function_addrs *p;
  struct function_addrs *addrs;
  size_t addrs_count;

  /* Use FVEC if it is not NULL.  Otherwise use our own vector.  */
  if (fvec != NULL)
    pfvec = fvec;
  else
    {
      memset (&lvec, 0, sizeof lvec);
      pfvec = &lvec;
    }

  unit_buf.name = ".debug_info";
  unit_buf.start = ddata->dwarf_sections.data[DEBUG_INFO];
  unit_buf.buf = u->unit_data;
  unit_buf.left = u->unit_data_len;
  unit_buf.is_bigendian = ddata->is_bigendian;
  unit_buf.error_callback = error_callback;
  unit_buf.data = data;
  unit_buf.reported_underflow = 0;

  while (unit_buf.left > 0)
    {
      if (!read_function_entry (state, ddata, u, 0, &unit_buf, lhdr,
				error_callback, data, pfvec, pfvec))
	return;
    }

  if (pfvec->count == 0)
    return;

  /* Allocate a trailing entry, but don't include it in
     pfvec->count.  */
  p = ((struct function_addrs *)
       backtrace_vector_grow (state, sizeof (struct function_addrs),
			      error_callback, data, &pfvec->vec));
  if (p == NULL)
    return;
  p->low = 0;
  --p->low;
  p->high = p->low;
  p->function = NULL;

  addrs_count = pfvec->count;

  if (fvec == NULL)