perf test: Add a test for strcmp_cpuid_str() expression

Test that the new expression builtin returns a match when the current
escaped CPU ID is given, and that it doesn't match when "0x0" is given.

The CPU ID in test__expr() has to be changed to perf_pmu__getcpuid()
which returns the CPU ID string, rather than the raw CPU ID that
get_cpuid() returns because that can't be used with strcmp_cpuid_str().
It doesn't affect the is_intel test because both versions contain
"Intel".
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: James Clark <james.clark@arm.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Chen Zhongjin <chenzhongjin@huawei.com>
Cc: Eduard Zingerman <eddyz87@gmail.com>
Cc: Haixin Yu <yuhaixin.yhx@linux.alibaba.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yang Jihong <yangjihong1@huawei.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20230904095104.1162928-5-james.clark@arm.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/expr.c

@@ -9,6 +9,7 @@
 #include <math.h>
 #include <stdlib.h>
 #include <string.h>
+#include <string2.h>
 #include <linux/zalloc.h>
 
 static int test_ids_union(void)
@@ -74,10 +75,13 @@ static int test__expr(struct test_suite *t __maybe_unused, int subtest __maybe_u
 	int ret;
 	struct expr_parse_ctx *ctx;
 	bool is_intel = false;
-	char buf[128];
+	char strcmp_cpuid_buf[256];
+	struct perf_pmu *pmu = pmu__find_core_pmu();
+	char *cpuid = perf_pmu__getcpuid(pmu);
+	char *escaped_cpuid1, *escaped_cpuid2;
 
-	if (!get_cpuid(buf, sizeof(buf)))
-		is_intel = strstr(buf, "Intel") != NULL;
+	TEST_ASSERT_VAL("get_cpuid", cpuid);
+	is_intel = strstr(cpuid, "Intel") != NULL;
 
 	TEST_ASSERT_EQUAL("ids_union", test_ids_union(), 0);
 
@@ -257,9 +261,28 @@ static int test__expr(struct test_suite *t __maybe_unused, int subtest __maybe_u
 	TEST_ASSERT_VAL("source count", hashmap__size(ctx->ids) == 1);
 	TEST_ASSERT_VAL("source count", hashmap__find(ctx->ids, "EVENT1", &val_ptr));
 
+
+	/* Test no cpuid match */
+	ret = test(ctx, "strcmp_cpuid_str(0x0)", 0);
+
+	/*
+	 * Test cpuid match with current cpuid. Special chars have to be
+	 * escaped.
+	 */
+	escaped_cpuid1 = strreplace_chars('-', cpuid, "\\-");
+	free(cpuid);
+	escaped_cpuid2 = strreplace_chars(',', escaped_cpuid1, "\\,");
+	free(escaped_cpuid1);
+	escaped_cpuid1 = strreplace_chars('=', escaped_cpuid2, "\\=");
+	free(escaped_cpuid2);
+	scnprintf(strcmp_cpuid_buf, sizeof(strcmp_cpuid_buf),
+		  "strcmp_cpuid_str(%s)", escaped_cpuid1);
+	free(escaped_cpuid1);
+	ret |= test(ctx, strcmp_cpuid_buf, 1);
+
 	/* has_event returns 1 when an event exists. */
 	expr__add_id_val(ctx, strdup("cycles"), 2);
-	ret = test(ctx, "has_event(cycles)", 1);
+	ret |= test(ctx, "has_event(cycles)", 1);
 
 	expr__ctx_free(ctx);