# Copyright 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 GDB can print a backtrace when it encounters an internal
# error or an internal warning, and that this functionality can be
# switched off.

standard_testfile bt-on-fatal-signal.c

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

# Check we can run to main.  If this works this time then we just
# assume that it will work later on (when we repeatedly restart GDB).
if ![runto_main] then {
    return -1
}

# Check that the backtrace-on-fatal-signal feature is supported.  If
# this target doesn't have the backtrace function available then
# trying to turn this on will give an error, in which case we just
# skip this test.
gdb_test_multiple "maint set internal-error backtrace on" \
    "check backtrace is supported" {
    -re "support for this feature is not compiled into GDB" {
	untested "feature not supported"
	return -1
    }
    -re "$gdb_prompt $" {
	pass $gdb_test_name
    }
}

# MODE should be either 'on' or 'off', while PROBLEM_TYPE should be
# 'internal-error' or 'internal-warning'.  This proc sets the
# backtrace printing for PROBLEM_TYPE to MODE, then uses 'maint
# PROBLEM_TYPE foobar' to raise a fake error or warning.
#
# We then check that a backtrace either is, or isn't printed, inline
# with MODE.
proc run_test {problem_type mode} {

    with_test_prefix "problem=${problem_type}, mode=${mode}" {
	gdb_test_no_output "maint set ${problem_type} backtrace ${mode}"

	set header_lines 0
	set bt_lines 0

	gdb_test_multiple "maint ${problem_type} foobar" "scan for backtrace" {
	    -early -re "^\r\n" {
		exp_continue
	    }
	    -early -re "^maint ${problem_type} foobar\r\n" {
		exp_continue
	    }
	    -early -re "^\[^\r\n\]+: ${problem_type}: foobar\r\n" {
		incr header_lines
		exp_continue
	    }
	    -early -re "^A problem internal to GDB has been detected" {
		incr header_lines
		exp_continue
	    }
	    -early -re "^,\r\nfurther debugging may prove unreliable\\.\r\n" {
		incr header_lines
		exp_continue
	    }
	    -early -re "^----- Backtrace -----\r\n" {
		incr bt_lines
		exp_continue
	    }
	    -early -re "^\[^-\].+\r\n---------------------\r\n" {
		incr bt_lines
		exp_continue
	    }
	    eof {
		fail ${gdb_test_name}
		return
	    }
	    -re "$::gdb_prompt $" {
		pass ${gdb_test_name}
	    }
	}

	gdb_assert { ${header_lines} == 3 }
	if { $mode == "on" } {
	    gdb_assert { ${bt_lines} == 2 }
	} else {
	    gdb_assert { ${bt_lines} == 0 }
	}
    }
}

# For each problem type (error or warning) raise a fake problem using
# the maintenance commands and check that a backtrace is (or isn't)
# printed, depending on the user setting.
foreach problem_type { internal-error internal-warning } {
    gdb_test_no_output "maint set ${problem_type} corefile no"
    gdb_test_no_output "maint set ${problem_type} quit no"

    foreach mode { on off } {
	run_test ${problem_type} ${mode}
    }
}