binutils-gdb/gdb/testsuite/gdb.base/readnever.exp

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Add support for the readnever concept The purpose of this concept is to turn the load of debugging information off, either globally (via the '--readnever' option), or objfile-specific. The implementation proposed here is an extension of the patch distributed with Fedora GDB; looking at the Fedora patch itself and the history, one can see some reasons why it was never resubmitted: - The patch appears to have been introduced as a workaround, at least initially; - The patch is far from perfect, as it simply shunts the load of DWARF debugging information, without really worrying about the other debug format. - Who really does non-symbolic debugging anyways? One use of this feature is when a user simply wants to do the following sequence: attach, dump core, detach. Loading the debugging information in this case is an unnecessary cause of delay. This patch expands the version shipped with Fedora GDB in order to make the feature available for all the debuginfo backends, not only for DWARF. It also implements a per-objfile flag which can be activated by using the "-readnever" command when using the 'add-symbol-file' or 'symbol-file' commands. It's also worth mentioning that this patch tests whether GDB correctly fails to initialize if both '--readnow' and '--readnever' options are passed. Tested on the BuildBot. gdb/ChangeLog: 2017-12-01 Andrew Cagney <cagney@redhat.com> Joel Brobecker <brobecker@adacore.com> Sergio Durigan Junior <sergiodj@redhat.com> * NEWS (Changes since GDB 8.0: Mention new '--readnever' feature. * coffread.c (coff_symfile_read): Do not map over sections with 'coff_locate_sections' if readnever is on. * dwarf2read.c (dwarf2_has_info): Return 0 if readnever is on. * elfread.c (elf_symfile_read): Do not map over sections with 'elf_locate_sections' if readnever is on. * main.c (validate_readnow_readnever): New function. (captured_main_1): Add support for --readnever. (print_gdb_help): Document --readnever. * objfile-flags.h (enum objfile_flag) <OBJF_READNEVER>: New flag. * symfile.c (readnever_symbol_files): New global. (symbol_file_add_with_addrs): Set 'OBJF_READNEVER' when 'READNEVER_SYMBOL_FILES' is set. (validate_readnow_readnever): New function. (symbol_file_command): Handle '-readnever' option. Call 'validate_readnow_readnever'. (add_symbol_file_command): Handle '-readnever' option. Call 'validate_readnow_readnever'. (_initialize_symfile): Document new '-readnever' option for both 'symbol-file' and 'add-symbol-file' commands. * top.h (readnever_symbol_files): New extern global. * xcoffread.c (xcoff_initial_scan): Do not read debug information if readnever is on. gdb/doc/ChangeLog: 2017-12-01 Andrew Cagney <cagney@redhat.com> Joel Brobecker <brobecker@adacore.com> Sergio Durigan Junior <sergiodj@redhat.com> * gdb.texinfo (File Options): Document --readnever. (Commands to Specify Files): Likewise, for 'symbol-file' and 'add-symbol-file'. gdb/testsuite/ChangeLog: 2017-12-01 Joel Brobecker <brobecker@adacore.com> Sergio Durigan Junior <sergiodj@redhat.com> Pedro Alves <palves@redhat.com> * gdb.base/readnever.c, gdb.base/readnever.exp: New files.
2017-11-24 22:56:08 +01:00
# Copyright 2016-2017 Free Software Foundation, Inc.
# 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/>.
standard_testfile .c
if { [build_executable "failed to build" $testfile $srcfile { debug }] == -1 } {
untested "Couldn't compile ${srcfile}"
return -1
}
save_vars { GDBFLAGS } {
append GDBFLAGS " --readnever"
clean_restart ${binfile}
}
if ![runto_main] then {
perror "couldn't run to breakpoint"
continue
}
gdb_test "break fun_three" \
"Breakpoint $decimal at $hex"
gdb_test "continue" \
"Breakpoint $decimal, $hex in fun_three \\(\\)"
gdb_test "backtrace" \
[multi_line "#0 $hex in fun_three \\(\\)" \
"#1 $hex in fun_two \\(\\)" \
"#2 $hex in fun_one \\(\\)" \
"#3 $hex in main \\(\\)" ]
gdb_test_no_output "maint info symtabs" \
"maint info symtabs no output for --readnever"
gdb_test_no_output "maint info psymtabs" \
"maint info psymtabs no output for --readnever"
# Test invalid combination of flags.
save_vars { GDBFLAGS } {
append GDBFLAGS " --readnever --readnow"
gdb_exit
gdb_spawn
set test "test readnow and readnever at the same time"
gdb_test_multiple "" $test {
"'--readnow' and '--readnever' cannot be specified simultaneously" {
pass $test
set test "expect eof after failure"
gdb_test_multiple "" $test {
eof {
pass $test
}
}
}
}
}
# Test symbol-file's -readnever option.
# Restart GDB without the --readnever option.
gdb_exit
gdb_start
gdb_test "symbol-file ${binfile}0.o -readnever" \
"Reading symbols from ${binfile}0\.o\.\.\.\\\(no debugging symbols found\\\)\.\.\.done\." \
"use symbol-file -readnever"
gdb_test_no_output "maint info symtabs" \
"maint info symtabs no output for symbol-file -readnever"
gdb_test_no_output "maint info psymtabs" \
"maint info psymtabs no output for symbol-file -readnever"