binutils-gdb/gdb/testsuite/gdb.base/consecutive-step-over.exp

# Copyright 2014-2017 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/>.

#
# Regression test for a bug where GDB would internal error if a thread
# runs into a breakpoint that needs stepping over, just after stepping
# over another breakpoint, without a user visible stop in between.
#
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
}

# Make sure the target doesn't hide the breakpoint hits (that don't
# cause a user visible stop) from GDB.
gdb_test_no_output "set breakpoint condition-evaluation host"

set up_to_nl "\[^\r\n\]+\[\r\n\]+"

# Number of consecutive breakpoints in a row to try.
set n_insns 3

# Extract addresses of a few consecutive instructions.
set test "get breakpoint addresses"
if { [gdb_test_multiple "x /[expr $n_insns + 1]i \$pc" $test {
    -re "=> $hex${up_to_nl}   ($hex)${up_to_nl}   ($hex)${up_to_nl}   ($hex)${up_to_nl}$gdb_prompt $" {
	for {set i 1} {$i <= $n_insns} {incr i} {
	    set bp_addrs($i) $expect_out($i,string)
	}
	pass $test
    }
}] != 0 } {
    # No use proceeding if bp_addrs wasn't set.
    return
}

for {set i 1} {$i <= $n_insns} {incr i} {
    with_test_prefix "insn $i" {
	gdb_test "break \*$bp_addrs($i)" \
	    "Breakpoint $decimal at $bp_addrs($i): file .*" \
	    "set breakpoint"

	# Give the breakpoint a condition that always fails, so that
	# the thread is immediately re-resumed.
	gdb_test_no_output "condition \$bpnum condition" \
	    "set condition"
    }
}

set lineno [gdb_get_line_number "break here"]
gdb_breakpoint $lineno
gdb_continue_to_breakpoint "break here" ".*break here.*"