Function read_attribute

external/tracy/libbacktrace/dwarf.cpp:1089–1364

   forms, because we don't care about them.  */

static int
read_attribute (enum dwarf_form form, uint64_t implicit_val,
		struct dwarf_buf *buf, int is_dwarf64, int version,
		int addrsize, const struct dwarf_sections *dwarf_sections,
		struct dwarf_data *altlink, struct attr_val *val)
{
  /* Avoid warnings about val.u.FIELD may be used uninitialized if
     this function is inlined.  The warnings aren't valid but can
     occur because the different fields are set and used
     conditionally.  */
  memset (val, 0, sizeof *val);

  switch (form)
    {
    case DW_FORM_addr:
      val->encoding = ATTR_VAL_ADDRESS;
      val->u.uint = read_address (buf, addrsize);
      return 1;
    case DW_FORM_block2:
      val->encoding = ATTR_VAL_BLOCK;
      return advance (buf, read_uint16 (buf));
    case DW_FORM_block4:
      val->encoding = ATTR_VAL_BLOCK;
      return advance (buf, read_uint32 (buf));
    case DW_FORM_data2:
      val->encoding = ATTR_VAL_UINT;
      val->u.uint = read_uint16 (buf);
      return 1;
    case DW_FORM_data4:
      val->encoding = ATTR_VAL_UINT;
      val->u.uint = read_uint32 (buf);
      return 1;
    case DW_FORM_data8:
      val->encoding = ATTR_VAL_UINT;
      val->u.uint = read_uint64 (buf);
      return 1;
    case DW_FORM_data16:
      val->encoding = ATTR_VAL_BLOCK;
      return advance (buf, 16);
    case DW_FORM_string:
      val->encoding = ATTR_VAL_STRING;
      val->u.string = read_string (buf);
      return val->u.string == NULL ? 0 : 1;
    case DW_FORM_block:
      val->encoding = ATTR_VAL_BLOCK;
      return advance (buf, read_uleb128 (buf));
    case DW_FORM_block1:
      val->encoding = ATTR_VAL_BLOCK;
      return advance (buf, read_byte (buf));
    case DW_FORM_data1:
      val->encoding = ATTR_VAL_UINT;
      val->u.uint = read_byte (buf);
      return 1;
    case DW_FORM_flag:
      val->encoding = ATTR_VAL_UINT;
      val->u.uint = read_byte (buf);
      return 1;
    case DW_FORM_sdata: