binutils-gdb/gdb/testsuite/gdb.base/break-main-file-remove-fail.exp

# Copyright 2014-2018 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/>.  */

# Test that GDB isn't silent if it fails to remove a breakpoint from
# the main program, independently of whether the program was loaded
# with "file PROGRAM" or directly from the command line with "gdb
# PROGRAM".

standard_testfile

if {[build_executable "failed to prepare" $testfile $srcfile debug]} {
    return -1
}

# Run the test proper.  INITIAL_LOAD determines whether the program is
# initially loaded by the "file" command or by passing it to GDB on
# the command line.
proc test_remove_bp { initial_load } {
    with_test_prefix "$initial_load" {
	global srcdir subdir binfile
	global gdb_prompt hex
	global GDBFLAGS

	gdb_exit

	set saved_gdbflags $GDBFLAGS

	# See "used to behave differently" further below.
	if { $initial_load == "file" } {
	    gdb_start
	    gdb_file_cmd $binfile
	} else {
	    global last_loaded_file

	    # gdb_file_cmd sets this.  This is what gdb_reload
	    # implementations use as binary.
	    set last_loaded_file $binfile

	    set GDBFLAGS "$GDBFLAGS $binfile"
	    gdb_start
	}
	gdb_reinitialize_dir $srcdir/$subdir
	gdb_reload
	set GDBFLAGS $saved_gdbflags

	if ![runto start] {
	    fail "can't run to start"
	    return
	}

	delete_breakpoints

	# So we can easily control when are breakpoints removed.
	gdb_test_no_output "set breakpoint always-inserted on"

	set bp_addr ""

	set test "break foo"
	gdb_test_multiple $test $test {
	    -re "Breakpoint .* at ($hex).*$gdb_prompt $" {
		set bp_addr $expect_out(1,string)
		pass $test
	    }
	}

	if {$bp_addr == ""} {
	    unsupported "can't extract foo's address"
	    return
	}

	gdb_test "info break" "y.*$hex.*in foo at.*" \
	    "breakpoint is set"

	# Now unmap the page where the breakpoint is set.  Trying to
	# remove the memory breakpoint afterwards should fail, and GDB
	# should warn the user about it.
	set pagesize [get_integer_valueof "pg_size" 0]
	set align_addr [expr $bp_addr - $bp_addr % $pagesize]
	set munmap [get_integer_valueof "(int) munmap ($align_addr, $pagesize)" -1]

	if {$munmap != 0} {
	    unsupported "can't munmap foo's page"
	    return
	}

	gdb_test "delete \$bpnum" \
	    "warning: Error removing breakpoint .*" \
	    "failure to remove breakpoint warns"
    }
}

foreach initial_load { "cmdline" "file" } {
    test_remove_bp $initial_load
}