perf testsuite probe: Add test for line semantics

The perf-probe command uses a specific semantics to describe probes.
Test some patterns that are known to be both valid and invalid if
they are handled appropriately.

This test is run as a part of perftool-testsuite_probe test case.

Signed-off-by: Veronika Molnarova <[e-mail]>
Cc: Athira Rajeev <[e-mail]>
Cc: Ian Rogers <[e-mail]>
Cc: Masami Hiramatsu <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Michael Petlan <[e-mail]>
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/tests/shell/base_probe/test_line_semantics.sh

···
+#!/bin/bash
+
+# SPDX-License-Identifier: GPL-2.0
+
+#
+#	test_line_semantics of perf_probe test
+#	Author: Masami Hiramatsu <[e-mail]>
+#	Author: Michael Petlan <[e-mail]>
+#
+#	Description:
+#
+#		This test checks whether the semantic errors of line option's
+#		arguments are properly reported.
+#
+
+# include working environment
+. ../common/init.sh
+
+TEST_RESULT=0
+
+if ! check_kprobes_available; then
+	print_overall_skipped
+	exit 0
+fi
+
+
+### acceptable --line descriptions
+
+# testing acceptance of valid patterns for the '--line' option
+VALID_PATTERNS="func func:10 func:0-10 func:2+10 func@source.c func@source.c:1 source.c:1 source.c:1+1 source.c:1-10"
+for desc in $VALID_PATTERNS; do
+	! ( $CMD_PERF probe --line $desc 2>&1 | grep -q "Semantic error" )
+	CHECK_EXIT_CODE=$?
+
+	print_results 0 $CHECK_EXIT_CODE "acceptable descriptions :: $desc"
+	(( TEST_RESULT += $? ))
+done
+
+
+### unacceptable --line descriptions
+
+# testing handling of invalid patterns for the '--line' option
+INVALID_PATTERNS="func:foo func:1-foo func:1+foo func;lazy\*pattern"
+for desc in $INVALID_PATTERNS; do
+	$CMD_PERF probe --line $desc 2>&1 | grep -q "Semantic error"
+	CHECK_EXIT_CODE=$?
+
+	print_results 0 $CHECK_EXIT_CODE "unacceptable descriptions :: $desc"
+	(( TEST_RESULT += $? ))
+done
+
+
+# print overall results
+print_overall_results "$TEST_RESULT"
+exit $?