1#!/bin/sh
2# SPDX-License-Identifier: GPL-2.0
3# description: event trigger - test histogram expression parsing
4# requires: set_event events/sched/sched_process_fork/trigger events/sched/sched_process_fork/hist error_log "<var1>=<field|var_ref|numeric_literal>":README
5
6
7fail() { #msg
8    echo $1
9    exit_fail
10}
11
12test_hist_expr() { # test_name expression expected_val
13    trigger="events/sched/sched_process_fork/trigger"
14
15    reset_trigger_file $trigger
16
17    echo "Test hist trigger expressions - $1"
18
19    echo "hist:keys=common_pid:x=$2" > $trigger
20
21    for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
22
23    actual=`grep -o 'x=[[:digit:]]*' $trigger | awk -F= '{ print $2 }'`
24
25    if [ $actual != $3 ]; then
26        fail "Failed hist trigger expression evaluation: Expression: $2 Expected: $3, Actual: $actual"
27    fi
28
29    reset_trigger_file $trigger
30}
31
32check_error() { # test_name command-with-error-pos-by-^
33    trigger="events/sched/sched_process_fork/trigger"
34
35    echo "Test hist trigger expressions - $1"
36    ftrace_errlog_check 'hist:sched:sched_process_fork' "$2" $trigger
37}
38
39test_hist_expr "Variable assignment" "123" "123"
40
41test_hist_expr "Subtraction not associative" "16-8-4-2" "2"
42
43test_hist_expr "Division not associative" "64/8/4/2" "1"
44
45test_hist_expr "Same precedence operators (+,-) evaluated left to right" "16-8+4+2" "14"
46
47test_hist_expr "Same precedence operators (*,/) evaluated left to right" "4*3/2*2" "12"
48
49test_hist_expr "Multiplication evaluated before addition/subtraction" "4+3*2-2" "8"
50
51test_hist_expr "Division evaluated before addition/subtraction" "4+6/2-2" "5"
52
53# err pos for "too many subexpressions" is dependent on where
54# the last subexpression was detected. This can vary depending
55# on how the expression tree was generated.
56check_error "Too many subexpressions" 'hist:keys=common_pid:x=32+^10*3/20-4'
57check_error "Too many subexpressions" 'hist:keys=common_pid:x=^1+2+3+4+5'
58
59check_error "Unary minus not supported in subexpression" 'hist:keys=common_pid:x=-(^1)+2'
60
61check_error "Division by zero" 'hist:keys=common_pid:x=3/^0'
62
63exit 0
64