binutils-gdb/gdb/testsuite/gdb.base/break-unload-file.exp

# Copyright 2014-2021 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 "file" doesn't leave stale breakpoints planted in the
# target.

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.  ALWAYS_INSERT determines whether always-inserted
# mode is on/off.  BREAK_COMMAND is the break command being tested.
#
proc test_break { initial_load always_inserted break_command } {
    global srcdir subdir binfile
    global gdb_prompt hex
    global GDBFLAGS

    append prefix "$initial_load: "
    append prefix "always-inserted $always_inserted: "
    append prefix "$break_command"
    with_test_prefix "$prefix" {
	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_main] then {
	    return
	}

	delete_breakpoints

	gdb_test_no_output "set breakpoint always-inserted $always_inserted"

	set test "$break_command foo"
	gdb_test_multiple "$break_command foo" $test {
	    -re "No hardware breakpoint support in the target.*$gdb_prompt $" {
		unsupported $test
		return
	    }
	    -re "Hardware breakpoints used exceeds limit.*$gdb_prompt $" {
		unsupported $test
		return
	    }
	    -re "Cannot insert hardware breakpoint.*$gdb_prompt $" {
		unsupported $test
		return
	    }
	    -re ".*reakpoint .* at .*$gdb_prompt $" {
		pass $test
	    }
	}

	# The breakpoint shouldn't be pending now.
	gdb_test "info break" "y.*$hex.*in foo at.*" \
	    "breakpoint is not pending"

	# Remove the file, while the breakpoint above is inserted in a
	# function in the main objfile.  GDB used to have a bug where
	# it would mark the breakpoint as uninserted, but actually
	# would leave it inserted in the target.
	set test "file"
	gdb_test_multiple "file" $test {
	    -re "Are you sure you want to change the file. .*y or n. $" {
		send_gdb "y\n"
		exp_continue
	    }
	    -re "Discard symbol table from `.*'? .y or n. $" {
		send_gdb "y\n"
		exp_continue
	    }
	    -re "No symbol file now\\.\r\n$gdb_prompt $" {
		pass $test
	    }
	}

	# This test used to behave differently depending on whether
	# the program was first loaded through "file PROGRAM" or "gdb
	# PROGRAM".
	set ws "\[ \t\]"
	gdb_test "info break" "breakpoint${ws}+keep${ws}+n${ws}+$hex${ws}*" \
	    "breakpoint is disabled"

	# Now delete the breakpoint from GDB's tables, to make sure
	# GDB doesn't reinsert it, masking the bug (with the bug, on
	# re-insert, GDB would fill the shadow buffer with a
	# breakpoint instruction).  Avoid delete_breakpoints as that
	# doesn't record a pass/fail.
	gdb_test "delete" "" "delete all breakpoints" \
	    "Delete all breakpoints.*y or n.*$" "y"

	# Re-add symbols back.
	set test "file \$binfile"
	gdb_test_multiple "file $binfile" $test {
	    -re "Are you sure you want to change the file. .*y or n. $" {
		send_gdb "y\n"
		exp_continue
	    }
	    -re "Reading symbols from.*$gdb_prompt $" {
		pass $test
	    }
	}

	# Run to another function now.  With the bug, GDB would trip
	# on a spurious trap at foo.
	gdb_test "b bar" ".*reakpoint .* at .*"
	gdb_test "continue" "Breakpoint .*, bar .*"
    }
}

foreach initial_load { "cmdline" "file" } {
    # While it doesn't trigger the original bug this is a regression
    # test for, test with breakpoint always-inserted off for extra
    # coverage.
    foreach always_inserted { "off" "on" } {
	test_break $initial_load $always_inserted "break"
	if {![skip_hw_breakpoint_tests]} {
	    test_break $initial_load $always_inserted "hbreak"
	}
    }
}