119 lines
4.0 KiB
C
119 lines
4.0 KiB
C
/* DWARF attributes
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Copyright (C) 1994-2020 Free Software Foundation, Inc.
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Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology,
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Inc. with support from Florida State University (under contract
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with the Ada Joint Program Office), and Silicon Graphics, Inc.
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Initial contribution by Brent Benson, Harris Computer Systems, Inc.,
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based on Fred Fish's (Cygnus Support) implementation of DWARF 1
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support.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef GDB_DWARF2_ATTRIBUTE_H
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#define GDB_DWARF2_ATTRIBUTE_H
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#include "dwarf2.h"
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/* Blocks are a bunch of untyped bytes. */
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struct dwarf_block
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{
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size_t size;
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/* Valid only if SIZE is not zero. */
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const gdb_byte *data;
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};
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/* Attributes have a name and a value. */
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struct attribute
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{
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/* Read the given attribute value as an address, taking the
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attribute's form into account. */
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CORE_ADDR value_as_address () const;
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/* Return non-zero if ATTR's value is a section offset --- classes
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lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
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You may use DW_UNSND (attr) to retrieve such offsets.
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Section 7.5.4, "Attribute Encodings", explains that no attribute
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may have a value that belongs to more than one of these classes; it
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would be ambiguous if we did, because we use the same forms for all
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of them. */
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bool form_is_section_offset () const;
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/* Return non-zero if ATTR's value falls in the 'constant' class, or
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zero otherwise. When this function returns true, you can apply
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dwarf2_get_attr_constant_value to it.
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However, note that for some attributes you must check
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attr_form_is_section_offset before using this test. DW_FORM_data4
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and DW_FORM_data8 are members of both the constant class, and of
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the classes that contain offsets into other debug sections
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(lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
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that, if an attribute's can be either a constant or one of the
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section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
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taken as section offsets, not constants.
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DW_FORM_data16 is not considered as dwarf2_get_attr_constant_value
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cannot handle that. */
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bool form_is_constant () const;
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/* DW_ADDR is always stored already as sect_offset; despite for the forms
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besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
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bool form_is_ref () const;
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/* Check if the attribute's form is a DW_FORM_block*
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if so return true else false. */
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bool form_is_block () const;
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ENUM_BITFIELD(dwarf_attribute) name : 16;
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ENUM_BITFIELD(dwarf_form) form : 15;
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/* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
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field should be in u.str (existing only for DW_STRING) but it is kept
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here for better struct attribute alignment. */
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unsigned int string_is_canonical : 1;
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union
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{
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const char *str;
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struct dwarf_block *blk;
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ULONGEST unsnd;
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LONGEST snd;
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CORE_ADDR addr;
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ULONGEST signature;
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}
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u;
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};
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/* Get at parts of an attribute structure. */
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#define DW_STRING(attr) ((attr)->u.str)
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#define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
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#define DW_UNSND(attr) ((attr)->u.unsnd)
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#define DW_BLOCK(attr) ((attr)->u.blk)
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#define DW_SND(attr) ((attr)->u.snd)
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#define DW_ADDR(attr) ((attr)->u.addr)
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#define DW_SIGNATURE(attr) ((attr)->u.signature)
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#endif /* GDB_DWARF2_ATTRIBUTE_H */
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