Stale breakpoint instructions, spurious SIGTRAPS.

[thirdparty/binutils-gdb.git] / gdb / testsuite / gdb.base / break-unload-file.exp

# Copyright 2014 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 {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} {
    return -1
}

if ![runto_main] then {
    fail "Can't run to main"
    return 0
}

# Run the test proper.  ALWAYS_INSERT determines whether
# always-inserted mode is on/off, and BREAK_COMMAND is the break
# command being tested.
#
proc test_break { always_inserted break_command } {
    global gdb_prompt binfile hex

    with_test_prefix "always-inserted $always_inserted: $break_command" {
	clean_restart $binfile

	if ![runto_main] then {
	    fail "Can't run to main"
	    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
	    }
	}

	gdb_test "info break" "y.*PENDING.*foo" \
	    "breakpoint is not pending"

	# 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. $" {
		send_gdb "y\n"
		exp_continue
	    }
	    -re "Reading symbols from.*done.*$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 .*"
    }
}

# 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 $always_inserted "break"
    if {![skip_hw_breakpoint_tests]} {
	test_break $always_inserted "hbreak"
    }
}