Function read_function_entry

Source/ThirdParty/tracy/libbacktrace/dwarf.cpp:3568–3816

   VEC.  Returns 1 on success, 0 on error.  */

static int
read_function_entry (struct backtrace_state *state, struct dwarf_data *ddata,
		     struct unit *u, uintptr_t base, struct dwarf_buf *unit_buf,
		     const struct line_header *lhdr,
		     backtrace_error_callback error_callback, void *data,
		     struct function_vector *vec_function,
		     struct function_vector *vec_inlined)
{
  while (unit_buf->left > 0)
    {
      uint64_t code;
      const struct abbrev *abbrev;
      int is_function;
      struct function *function;
      struct function_vector *vec;
      size_t i;
      struct pcrange pcrange;
      int have_linkage_name;

      code = read_uleb128 (unit_buf);
      if (code == 0)
	return 1;

      abbrev = lookup_abbrev (&u->abbrevs, code, error_callback, data);
      if (abbrev == NULL)
	return 0;

      is_function = (abbrev->tag == DW_TAG_subprogram
		     || abbrev->tag == DW_TAG_entry_point
		     || abbrev->tag == DW_TAG_inlined_subroutine);

      if (abbrev->tag == DW_TAG_inlined_subroutine)
	vec = vec_inlined;
      else
	vec = vec_function;

      function = NULL;
      if (is_function)
	{
	  function = ((struct function *)
		      backtrace_alloc (state, sizeof *function,
				       error_callback, data));
	  if (function == NULL)
	    return 0;
	  memset (function, 0, sizeof *function);
	}

      memset (&pcrange, 0, sizeof pcrange);
      have_linkage_name = 0;
      for (i = 0; i < abbrev->num_attrs; ++i)
	{
	  struct attr_val val;

	  if (!read_attribute (abbrev->attrs[i].form, abbrev->attrs[i].val,
			       unit_buf, u->is_dwarf64, u->version,
			       u->addrsize, &ddata->dwarf_sections,
			       ddata->altlink, &val))
	    return 0;