gdb/testsuite/gdb.base/add-symbol-file-attach.exp

# Copyright (C) 2021-2024 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/>.

# This is a test case for bug 27831:
#
# https://sourceware.org/bugzilla/show_bug.cgi?id=27831
#
# Prior to fixing this bug, GDB could be caused to assert by doing
# the following:  A simple program with a global was started outside
# of GDB.  Once GDB was started, the symbol file was loaded in an
# atypical manner via the 'add-symbol-file' command.  Then, the
# program was attached to via the 'attach' command at which time the
# symbol file was loaded again.  Once attached, printing the global
# variable in the program would trigger the assertion error.
#
# This is what the assert looked like:
#
# gdb/symtab.c:6599: internal-error: get_msymbol_address:
#   Assertion `(objf->flags & OBJF_MAINLINE) == 0' failed.

require can_spawn_for_attach

standard_testfile

if {[build_executable $testfile.exp $testfile $srcfile debug] == -1} {
    untested "failed to compile"
    return -1
}

# Use 'spawn_wait_for_attach' to start the test program running.  It'll
# also sleep for a short time in order to make sure that it's running
# so that GDB may attach to it.

set test_spawn_id [spawn_wait_for_attach $binfile]
set testpid [spawn_id_get_pid $test_spawn_id]

gdb_start

# Load the symbol file in an atypical manner by using the add-symbol-file
# command.

set test "add-symbol-file before attach"
gdb_test_multiple "add-symbol-file $binfile" $test {
    -re "add symbol table from file.*y or n. $" {
	send_gdb "y\n"
	exp_continue
    }
    -re -wrap "Reading symbols from .*" {
	pass $test
    }
}

# Attach to the process started above.  GDB will want to load a "new"
# symbol table, so handle that case.

set test "attach"
gdb_test_multiple "attach $testpid" $test {
    -re "Attaching to process.*Load new symbol table.*y or n. $" {
	send_gdb "y\n"
	exp_continue
    }
    -re -wrap "Reading symbols from .*" {
	pass $test
    }
}

# Print out the value of the global.  Prior to fixing bug 27831, GDB
# would assert while executing this command.

gdb_test "print foo" "42"