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573e600dea
In DWARF 5 (and even previous versions, with type units), compile units
are just one type of units. In many places, we still use "compile
units" when in reality it would be better to talk about "units" (unless
we specifically want to talk about compile units).
Rename comp-unit-head.{c.h} to unit-head.{c,h}, and do a big pass of
renames in it to remove the specific mentions of compile units, where in
fact we want to talk about units in general.
Change-Id: Ia06c90ccb25756c366f269a12620f2f7c8378adb
Approved-By: Tom Tromey <tom@tromey.com>
239 lines
6.9 KiB
C
239 lines
6.9 KiB
C
/* DWARF 2 debugging format support for GDB.
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Copyright (C) 1994-2025 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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#include "dwarf2/unit-head.h"
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#include "dwarf2/leb.h"
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#include "dwarf2/section.h"
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#include "dwarf2/stringify.h"
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#include "dwarf2/error.h"
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/* See unit-head.h. */
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const gdb_byte *
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read_unit_head (struct unit_head *header, const gdb_byte *info_ptr,
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struct dwarf2_section_info *section, ruh_kind section_kind)
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{
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int signed_addr;
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unsigned int bytes_read;
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const char *filename = section->get_file_name ();
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bfd *abfd = section->get_bfd_owner ();
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header->set_length (read_initial_length (abfd, info_ptr, &bytes_read));
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header->initial_length_size = bytes_read;
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header->offset_size = (bytes_read == 4) ? 4 : 8;
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info_ptr += bytes_read;
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unsigned version = read_2_bytes (abfd, info_ptr);
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if (version < 2 || version > 5)
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error (_(DWARF_ERROR_PREFIX
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"wrong version in unit header "
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"(is %d, should be 2, 3, 4 or 5) [in module %s]"),
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version, filename);
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header->version = version;
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info_ptr += 2;
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if (header->version < 5)
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switch (section_kind)
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{
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case ruh_kind::COMPILE:
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header->unit_type = DW_UT_compile;
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break;
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case ruh_kind::TYPE:
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header->unit_type = DW_UT_type;
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break;
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default:
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internal_error (_("read_unit_head: invalid section_kind"));
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}
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else
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{
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header->unit_type
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= static_cast<enum dwarf_unit_type> (read_1_byte (abfd, info_ptr));
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info_ptr += 1;
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switch (header->unit_type)
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{
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case DW_UT_compile:
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case DW_UT_partial:
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case DW_UT_skeleton:
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case DW_UT_split_compile:
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if (section_kind != ruh_kind::COMPILE)
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error (_(DWARF_ERROR_PREFIX
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"wrong unit_type in unit header "
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"(is %s, should be %s) [in module %s]"),
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dwarf_unit_type_name (header->unit_type),
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dwarf_unit_type_name (DW_UT_type), filename);
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break;
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case DW_UT_type:
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case DW_UT_split_type:
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section_kind = ruh_kind::TYPE;
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break;
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default:
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error (_(DWARF_ERROR_PREFIX
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"wrong unit_type in unit header "
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"(is %#04x, should be one of: %s, %s, %s, %s or %s) "
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"[in module %s]"),
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header->unit_type, dwarf_unit_type_name (DW_UT_compile),
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dwarf_unit_type_name (DW_UT_skeleton),
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dwarf_unit_type_name (DW_UT_split_compile),
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dwarf_unit_type_name (DW_UT_type),
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dwarf_unit_type_name (DW_UT_split_type), filename);
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}
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header->addr_size = read_1_byte (abfd, info_ptr);
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info_ptr += 1;
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}
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header->abbrev_sect_off
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= (sect_offset) header->read_offset (abfd, info_ptr, &bytes_read);
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info_ptr += bytes_read;
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if (header->version < 5)
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{
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header->addr_size = read_1_byte (abfd, info_ptr);
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info_ptr += 1;
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}
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signed_addr = bfd_get_sign_extend_vma (abfd);
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if (signed_addr < 0)
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internal_error (_("read_unit_head: dwarf from non elf file"));
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header->signed_addr_p = signed_addr;
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bool header_has_signature =
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(section_kind == ruh_kind::TYPE
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|| header->unit_type == DW_UT_skeleton
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|| header->unit_type == DW_UT_split_compile);
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if (header_has_signature)
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{
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header->signature = read_8_bytes (abfd, info_ptr);
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info_ptr += 8;
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}
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if (section_kind == ruh_kind::TYPE)
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{
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LONGEST type_offset;
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type_offset = header->read_offset (abfd, info_ptr, &bytes_read);
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info_ptr += bytes_read;
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header->type_offset_in_tu = (cu_offset) type_offset;
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if (to_underlying (header->type_offset_in_tu) != type_offset)
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error (_(DWARF_ERROR_PREFIX
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"Too big type_offset in unit "
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"header (is %s) [in module %s]"),
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plongest (type_offset), filename);
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}
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return info_ptr;
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}
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/* Subroutine of read_and_check_unit_head to to simplify it.
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Perform various error checking on the header. */
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static void
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error_check_unit_head (unit_head *header, dwarf2_section_info *section,
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dwarf2_section_info *abbrev_section)
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{
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const char *filename = section->get_file_name ();
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if (to_underlying (header->abbrev_sect_off) >= abbrev_section->size)
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error (_(DWARF_ERROR_PREFIX
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"bad offset (%s) in unit header "
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"(offset %s + 6) [in module %s]"),
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sect_offset_str (header->abbrev_sect_off),
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sect_offset_str (header->sect_off), filename);
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/* Cast to ULONGEST to use 64-bit arithmetic when possible to
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avoid potential 32-bit overflow. */
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if (((ULONGEST) header->sect_off + header->get_length_with_initial ())
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> section->size)
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error (_(DWARF_ERROR_PREFIX
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"bad length (0x%x) in unit header "
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"(offset %s + 0) [in module %s]"),
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header->get_length_without_initial (), sect_offset_str (header->sect_off),
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filename);
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}
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/* See unit-head.h. */
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const gdb_byte *
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read_and_check_unit_head (unit_head *header, dwarf2_section_info *section,
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dwarf2_section_info *abbrev_section,
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const gdb_byte *info_ptr, ruh_kind section_kind)
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{
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const gdb_byte *beg_of_unit = info_ptr;
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header->sect_off = (sect_offset) (beg_of_unit - section->buffer);
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info_ptr = read_unit_head (header, info_ptr, section, section_kind);
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header->first_die_offset_in_unit = (cu_offset) (info_ptr - beg_of_unit);
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error_check_unit_head (header, section, abbrev_section);
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return info_ptr;
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}
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unrelocated_addr
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unit_head::read_address (bfd *abfd, const gdb_byte *buf,
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unsigned int *bytes_read) const
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{
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ULONGEST retval = 0;
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if (signed_addr_p)
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{
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switch (addr_size)
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{
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case 2:
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retval = bfd_get_signed_16 (abfd, buf);
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break;
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case 4:
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retval = bfd_get_signed_32 (abfd, buf);
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break;
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case 8:
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retval = bfd_get_signed_64 (abfd, buf);
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break;
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default:
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internal_error (_("read_address: bad switch, signed [in module %s]"),
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bfd_get_filename (abfd));
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}
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}
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else
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{
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switch (addr_size)
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{
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case 2:
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retval = bfd_get_16 (abfd, buf);
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break;
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case 4:
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retval = bfd_get_32 (abfd, buf);
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break;
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case 8:
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retval = bfd_get_64 (abfd, buf);
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break;
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default:
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internal_error (_("read_address: bad switch, "
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"unsigned [in module %s]"),
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bfd_get_filename (abfd));
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}
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}
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*bytes_read = addr_size;
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return (unrelocated_addr) retval;
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}
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