437afbb81e
This adds a new "-dwarf-5" switch to "save gdb-index" that makes it generate index files with DWARF-5 .debug_names/.debug_str sections instead of GDB's own .gdb_index. We should probably add a command line option to contrib/gdb-add-index.sh (incl. cc-with-tweaks.sh) for the new -dwarf-5 GDB option, and a new target board to make it more convenient to exercise this. To be done later. gdb/ChangeLog 2017-12-08 Jan Kratochvil <jan.kratochvil@redhat.com> Pedro Alves <palves@redhat.com> * contrib/gdb-add-index.sh (index): Rename to ... (index4): ... here. (index5, debugstr, debugstrmerge, debugstrerr): New variables. Support also .debug_names and .debug_str. * dwarf2read.c: Include cmath, set, list. (INDEX_SUFFIX): Rename to ... (INDEX4_SUFFIX): ... here. (INDEX5_SUFFIX, DEBUG_STR_SUFFIX): New. (file_write(FILE *, const void *, size_t)): New. (file_write(FILE *, const std::vector<Elem, Alloc> &)): New. (data_buf::append_unsigned_leb128, data_buf::empty): New. (data_buf::file_write): Use ::file_write. (data_buf::c_str, dwarf5_djb_hash, debug_names) (check_dwarf64_offsets): New. (psyms_seen_size, write_gdbindex): New from write_psymtabs_to_index code. (dwarf5_gdb_augmentation, write_debug_names, assert_file_size) (enum dw_index_kind): New. (write_psymtabs_to_index): New parameter index_kind. Support filename_str and out_file_str. Move code to write_gdbindex, possibly call write_debug_names. (save_gdb_index_command): New parameter -dwarf-5. (_initialize_dwarf2_read): Document the new parameter -dwarf-5. gdb/doc/ChangeLog 2017-12-08 Jan Kratochvil <jan.kratochvil@redhat.com> * gdb.texinfo (Index Files): Document .debug_names and -dwarf-5. -- gdb/contrib/gdb-add-index.sh | 53 ++ gdb/doc/gdb.texinfo | 24 + gdb/dwarf2read.c | 919 ++++++++++++++++++++++++++++++++++++++++-- 3 files changed, 935 insertions(+), 61 deletions(-)
110 lines
3.1 KiB
Bash
Executable file
110 lines
3.1 KiB
Bash
Executable file
#! /bin/sh
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# Add a .gdb_index section to a file.
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# Copyright (C) 2010-2017 Free Software Foundation, Inc.
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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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#
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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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#
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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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# This program assumes gdb and objcopy are in $PATH.
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# If not, or you want others, pass the following in the environment
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GDB=${GDB:=gdb}
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OBJCOPY=${OBJCOPY:=objcopy}
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myname="${0##*/}"
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if test $# != 1; then
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echo "usage: $myname FILE" 1>&2
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exit 1
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fi
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file="$1"
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if test ! -r "$file"; then
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echo "$myname: unable to access: $file" 1>&2
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exit 1
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fi
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dir="${file%/*}"
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test "$dir" = "$file" && dir="."
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index4="${file}.gdb-index"
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index5="${file}.debug_names"
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debugstr="${file}.debug_str"
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debugstrmerge="${file}.debug_str.merge"
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debugstrerr="${file}.debug_str.err"
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rm -f $index4 $index5 $debugstr $debugstrmerge $debugstrerr
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# Ensure intermediate index file is removed when we exit.
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trap "rm -f $index4 $index5 $debugstr $debugstrmerge $debugstrerr" 0
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$GDB --batch -nx -iex 'set auto-load no' \
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-ex "file $file" -ex "save gdb-index $dir" || {
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# Just in case.
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status=$?
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echo "$myname: gdb error generating index for $file" 1>&2
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exit $status
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}
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# In some situations gdb can exit without creating an index. This is
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# not an error.
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# E.g., if $file is stripped. This behaviour is akin to stripping an
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# already stripped binary, it's a no-op.
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status=0
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if test -f "$index4" -a -f "$index5"; then
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echo "$myname: Both index types were created for $file" 1>&2
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status=1
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elif test -f "$index4" -o -f "$index5"; then
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if test -f "$index4"; then
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index="$index4"
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section=".gdb_index"
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else
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index="$index5"
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section=".debug_names"
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fi
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debugstradd=false
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debugstrupdate=false
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if test -s "$debugstr"; then
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if ! $OBJCOPY --dump-section .debug_str="$debugstrmerge" "$file" /dev/null \
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2>$debugstrerr; then
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cat >&2 $debugstrerr
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exit 1
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fi
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if grep -q "can't dump section '.debug_str' - it does not exist" \
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$debugstrerr; then
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debugstradd=true
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else
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debugstrupdate=true
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cat >&2 $debugstrerr
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fi
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cat "$debugstr" >>"$debugstrmerge"
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fi
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$OBJCOPY --add-section $section="$index" \
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--set-section-flags $section=readonly \
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$(if $debugstradd; then \
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echo --add-section .debug_str="$debugstrmerge"; \
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echo --set-section-flags .debug_str=readonly; \
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fi; \
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if $debugstrupdate; then \
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echo --update-section .debug_str="$debugstrmerge"; \
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fi) \
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"$file" "$file"
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status=$?
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else
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echo "$myname: No index was created for $file" 1>&2
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echo "$myname: [Was there no debuginfo? Was there already an index?]" 1>&2
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fi
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exit $status
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