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# flags: instance
6
7
8fail() { #msg
9    echo $1
10    exit_fail
11}
12
13test_hist_expr() { # test_name expression expected_val
14    trigger="events/sched/sched_process_fork/trigger"
15
16    reset_trigger_file $trigger
17
18    echo "Test hist trigger expressions - $1"
19
20    echo "hist:keys=common_pid:x=$2" > $trigger
21
22    for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
23
24    actual=`grep -o 'x=[[:digit:]]*' $trigger | awk -F= '{ print $2 }'`
25
26    if [ $actual != $3 ]; then
27        fail "Failed hist trigger expression evaluation: Expression: $2 Expected: $3, Actual: $actual"
28    fi
29
30    reset_trigger_file $trigger
31}
32
33check_error() { # test_name command-with-error-pos-by-^
34    trigger="events/sched/sched_process_fork/trigger"
35
36    echo "Test hist trigger expressions - $1"
37    ftrace_errlog_check 'hist:sched:sched_process_fork' "$2" $trigger
38}
39
40test_hist_expr "Variable assignment" "123" "123"
41
42test_hist_expr "Subtraction not associative" "16-8-4-2" "2"
43
44test_hist_expr "Division not associative" "64/8/4/2" "1"
45
46test_hist_expr "Same precedence operators (+,-) evaluated left to right" "16-8+4+2" "14"
47
48test_hist_expr "Same precedence operators (*,/) evaluated left to right" "4*3/2*2" "12"
49
50test_hist_expr "Multiplication evaluated before addition/subtraction" "4+3*2-2" "8"
51
52test_hist_expr "Division evaluated before addition/subtraction" "4+6/2-2" "5"
53
54# err pos for "too many subexpressions" is dependent on where
55# the last subexpression was detected. This can vary depending
56# on how the expression tree was generated.
57check_error "Too many subexpressions" 'hist:keys=common_pid:x=32+^10*3/20-4'
58check_error "Too many subexpressions" 'hist:keys=common_pid:x=^1+2+3+4+5'
59
60check_error "Unary minus not supported in subexpression" 'hist:keys=common_pid:x=-(^1)+2'
61
62check_error "Division by zero" 'hist:keys=common_pid:x=3/^0'
63
64exit 0
65