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- /* DWARF 2 debugging format support for GDB.
- Copyright (C) 1994-2022 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 <http://www.gnu.org/licenses/>. */
- #include "defs.h"
- #include "dwarf2/comp-unit-head.h"
- #include "dwarf2/leb.h"
- #include "dwarf2/read.h"
- #include "dwarf2/section.h"
- #include "dwarf2/stringify.h"
- /* See comp-unit-head.h. */
- const gdb_byte *
- read_comp_unit_head (struct comp_unit_head *cu_header,
- const gdb_byte *info_ptr,
- struct dwarf2_section_info *section,
- rcuh_kind section_kind)
- {
- int signed_addr;
- unsigned int bytes_read;
- const char *filename = section->get_file_name ();
- bfd *abfd = section->get_bfd_owner ();
- cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
- cu_header->initial_length_size = bytes_read;
- cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
- info_ptr += bytes_read;
- unsigned version = read_2_bytes (abfd, info_ptr);
- if (version < 2 || version > 5)
- error (_("Dwarf Error: wrong version in compilation unit header "
- "(is %d, should be 2, 3, 4 or 5) [in module %s]"),
- version, filename);
- cu_header->version = version;
- info_ptr += 2;
- if (cu_header->version < 5)
- switch (section_kind)
- {
- case rcuh_kind::COMPILE:
- cu_header->unit_type = DW_UT_compile;
- break;
- case rcuh_kind::TYPE:
- cu_header->unit_type = DW_UT_type;
- break;
- default:
- internal_error (__FILE__, __LINE__,
- _("read_comp_unit_head: invalid section_kind"));
- }
- else
- {
- cu_header->unit_type = static_cast<enum dwarf_unit_type>
- (read_1_byte (abfd, info_ptr));
- info_ptr += 1;
- switch (cu_header->unit_type)
- {
- case DW_UT_compile:
- case DW_UT_partial:
- case DW_UT_skeleton:
- case DW_UT_split_compile:
- if (section_kind != rcuh_kind::COMPILE)
- error (_("Dwarf Error: wrong unit_type in compilation unit header "
- "(is %s, should be %s) [in module %s]"),
- dwarf_unit_type_name (cu_header->unit_type),
- dwarf_unit_type_name (DW_UT_type), filename);
- break;
- case DW_UT_type:
- case DW_UT_split_type:
- section_kind = rcuh_kind::TYPE;
- break;
- default:
- error (_("Dwarf Error: wrong unit_type in compilation unit header "
- "(is %#04x, should be one of: %s, %s, %s, %s or %s) "
- "[in module %s]"), cu_header->unit_type,
- dwarf_unit_type_name (DW_UT_compile),
- dwarf_unit_type_name (DW_UT_skeleton),
- dwarf_unit_type_name (DW_UT_split_compile),
- dwarf_unit_type_name (DW_UT_type),
- dwarf_unit_type_name (DW_UT_split_type), filename);
- }
- cu_header->addr_size = read_1_byte (abfd, info_ptr);
- info_ptr += 1;
- }
- cu_header->abbrev_sect_off
- = (sect_offset) cu_header->read_offset (abfd, info_ptr, &bytes_read);
- info_ptr += bytes_read;
- if (cu_header->version < 5)
- {
- cu_header->addr_size = read_1_byte (abfd, info_ptr);
- info_ptr += 1;
- }
- signed_addr = bfd_get_sign_extend_vma (abfd);
- if (signed_addr < 0)
- internal_error (__FILE__, __LINE__,
- _("read_comp_unit_head: dwarf from non elf file"));
- cu_header->signed_addr_p = signed_addr;
- bool header_has_signature = section_kind == rcuh_kind::TYPE
- || cu_header->unit_type == DW_UT_skeleton
- || cu_header->unit_type == DW_UT_split_compile;
- if (header_has_signature)
- {
- cu_header->signature = read_8_bytes (abfd, info_ptr);
- info_ptr += 8;
- }
- if (section_kind == rcuh_kind::TYPE)
- {
- LONGEST type_offset;
- type_offset = cu_header->read_offset (abfd, info_ptr, &bytes_read);
- info_ptr += bytes_read;
- cu_header->type_cu_offset_in_tu = (cu_offset) type_offset;
- if (to_underlying (cu_header->type_cu_offset_in_tu) != type_offset)
- error (_("Dwarf Error: Too big type_offset in compilation unit "
- "header (is %s) [in module %s]"), plongest (type_offset),
- filename);
- }
- return info_ptr;
- }
- /* Subroutine of read_and_check_comp_unit_head and
- read_and_check_type_unit_head to simplify them.
- Perform various error checking on the header. */
- static void
- error_check_comp_unit_head (dwarf2_per_objfile *per_objfile,
- struct comp_unit_head *header,
- struct dwarf2_section_info *section,
- struct dwarf2_section_info *abbrev_section)
- {
- const char *filename = section->get_file_name ();
- if (to_underlying (header->abbrev_sect_off)
- >= abbrev_section->get_size (per_objfile->objfile))
- error (_("Dwarf Error: bad offset (%s) in compilation unit header "
- "(offset %s + 6) [in module %s]"),
- sect_offset_str (header->abbrev_sect_off),
- sect_offset_str (header->sect_off),
- filename);
- /* Cast to ULONGEST to use 64-bit arithmetic when possible to
- avoid potential 32-bit overflow. */
- if (((ULONGEST) header->sect_off + header->get_length ())
- > section->size)
- error (_("Dwarf Error: bad length (0x%x) in compilation unit header "
- "(offset %s + 0) [in module %s]"),
- header->length, sect_offset_str (header->sect_off),
- filename);
- }
- /* See comp-unit-head.h. */
- const gdb_byte *
- read_and_check_comp_unit_head (dwarf2_per_objfile *per_objfile,
- struct comp_unit_head *header,
- struct dwarf2_section_info *section,
- struct dwarf2_section_info *abbrev_section,
- const gdb_byte *info_ptr,
- rcuh_kind section_kind)
- {
- const gdb_byte *beg_of_comp_unit = info_ptr;
- header->sect_off = (sect_offset) (beg_of_comp_unit - section->buffer);
- info_ptr = read_comp_unit_head (header, info_ptr, section, section_kind);
- header->first_die_cu_offset = (cu_offset) (info_ptr - beg_of_comp_unit);
- error_check_comp_unit_head (per_objfile, header, section, abbrev_section);
- return info_ptr;
- }
- CORE_ADDR
- comp_unit_head::read_address (bfd *abfd, const gdb_byte *buf,
- unsigned int *bytes_read) const
- {
- CORE_ADDR retval = 0;
- if (signed_addr_p)
- {
- switch (addr_size)
- {
- case 2:
- retval = bfd_get_signed_16 (abfd, buf);
- break;
- case 4:
- retval = bfd_get_signed_32 (abfd, buf);
- break;
- case 8:
- retval = bfd_get_signed_64 (abfd, buf);
- break;
- default:
- internal_error (__FILE__, __LINE__,
- _("read_address: bad switch, signed [in module %s]"),
- bfd_get_filename (abfd));
- }
- }
- else
- {
- switch (addr_size)
- {
- case 2:
- retval = bfd_get_16 (abfd, buf);
- break;
- case 4:
- retval = bfd_get_32 (abfd, buf);
- break;
- case 8:
- retval = bfd_get_64 (abfd, buf);
- break;
- default:
- internal_error (__FILE__, __LINE__,
- _("read_address: bad switch, "
- "unsigned [in module %s]"),
- bfd_get_filename (abfd));
- }
- }
- *bytes_read = addr_size;
- return retval;
- }
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