/* DWARF attributes Copyright (C) 1994-2021 Free Software Foundation, Inc. Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology, Inc. with support from Florida State University (under contract with the Ada Joint Program Office), and Silicon Graphics, Inc. Initial contribution by Brent Benson, Harris Computer Systems, Inc., based on Fred Fish's (Cygnus Support) implementation of DWARF 1 support. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ #include "defs.h" #include "dwarf2/attribute.h" #include "dwarf2/stringify.h" #include "complaints.h" /* See attribute.h. */ CORE_ADDR attribute::as_address () const { CORE_ADDR addr; gdb_assert (!requires_reprocessing); if (form != DW_FORM_addr && form != DW_FORM_addrx && form != DW_FORM_GNU_addr_index) { /* Aside from a few clearly defined exceptions, attributes that contain an address must always be in DW_FORM_addr form. Unfortunately, some compilers happen to be violating this requirement by encoding addresses using other forms, such as DW_FORM_data4 for example. For those broken compilers, we try to do our best, without any guarantee of success, to interpret the address correctly. It would also be nice to generate a complaint, but that would require us to maintain a list of legitimate cases where a non-address form is allowed, as well as update callers to pass in at least the CU's DWARF version. This is more overhead than what we're willing to expand for a pretty rare case. */ addr = u.unsnd; } else addr = u.addr; return addr; } /* See attribute.h. */ bool attribute::form_is_string () const { return (form == DW_FORM_strp || form == DW_FORM_line_strp || form == DW_FORM_string || form == DW_FORM_strx || form == DW_FORM_strx1 || form == DW_FORM_strx2 || form == DW_FORM_strx3 || form == DW_FORM_strx4 || form == DW_FORM_GNU_str_index || form == DW_FORM_GNU_strp_alt); } /* See attribute.h. */ const char * attribute::as_string () const { gdb_assert (!requires_reprocessing); if (form_is_string ()) return u.str; return nullptr; } /* See attribute.h. */ bool attribute::form_is_block () const { return (form == DW_FORM_block1 || form == DW_FORM_block2 || form == DW_FORM_block4 || form == DW_FORM_block || form == DW_FORM_exprloc || form == DW_FORM_data16); } /* See attribute.h. */ bool attribute::form_is_section_offset () const { return (form == DW_FORM_data4 || form == DW_FORM_data8 || form == DW_FORM_sec_offset || form == DW_FORM_loclistx); } /* See attribute.h. */ bool attribute::form_is_constant () const { switch (form) { case DW_FORM_sdata: case DW_FORM_udata: case DW_FORM_data1: case DW_FORM_data2: case DW_FORM_data4: case DW_FORM_data8: case DW_FORM_implicit_const: return true; default: return false; } } /* See attribute.h. */ void attribute::get_ref_die_offset_complaint () const { complaint (_("unsupported die ref attribute form: '%s'"), dwarf_form_name (form)); } /* See attribute.h. */ LONGEST attribute::constant_value (int default_value) const { if (form == DW_FORM_sdata || form == DW_FORM_implicit_const) return u.snd; else if (form == DW_FORM_udata || form == DW_FORM_data1 || form == DW_FORM_data2 || form == DW_FORM_data4 || form == DW_FORM_data8) return u.unsnd; else { /* For DW_FORM_data16 see attribute::form_is_constant. */ complaint (_("Attribute value is not a constant (%s)"), dwarf_form_name (form)); return default_value; } } /* See attribute.h. */ bool attribute::form_is_unsigned () const { return (form == DW_FORM_ref_addr || form == DW_FORM_GNU_ref_alt || form == DW_FORM_data2 || form == DW_FORM_data4 || form == DW_FORM_data8 || form == DW_FORM_sec_offset || form == DW_FORM_data1 || form == DW_FORM_flag || form == DW_FORM_flag_present || form == DW_FORM_udata || form == DW_FORM_rnglistx || form == DW_FORM_loclistx || form == DW_FORM_ref1 || form == DW_FORM_ref2 || form == DW_FORM_ref4 || form == DW_FORM_ref8 || form == DW_FORM_ref_udata); } /* See attribute.h. */ bool attribute::form_requires_reprocessing () const { return (form == DW_FORM_strx1 || form == DW_FORM_strx2 || form == DW_FORM_strx3 || form == DW_FORM_strx4 || form == DW_FORM_GNU_str_index || form == DW_FORM_addrx || form == DW_FORM_GNU_addr_index || form == DW_FORM_rnglistx || form == DW_FORM_loclistx); } /* See attribute.h. */ dwarf_defaulted_attribute attribute::defaulted () const { LONGEST value = constant_value (-1); switch (value) { case DW_DEFAULTED_no: case DW_DEFAULTED_in_class: case DW_DEFAULTED_out_of_class: return (dwarf_defaulted_attribute) value; } /* If the form was not constant, we already complained in constant_value, so there's no need to complain again. */ if (form_is_constant ()) complaint (_("unrecognized DW_AT_defaulted value (%s)"), plongest (value)); return DW_DEFAULTED_no; } /* See attribute.h. */ dwarf_virtuality_attribute attribute::as_virtuality () const { LONGEST value = constant_value (-1); switch (value) { case DW_VIRTUALITY_none: case DW_VIRTUALITY_virtual: case DW_VIRTUALITY_pure_virtual: return (dwarf_virtuality_attribute) value; } /* If the form was not constant, we already complained in constant_value, so there's no need to complain again. */ if (form_is_constant ()) complaint (_("unrecognized DW_AT_virtuality value (%s)"), plongest (value)); return DW_VIRTUALITY_none; } /* See attribute.h. */ bool attribute::as_boolean () const { if (form == DW_FORM_flag_present) return true; else if (form == DW_FORM_flag) return u.unsnd != 0; return constant_value (0) != 0; }