[metrics] Define Counter and related data structures
Add a definition for Counter, which is a type of metric ART can
collect. Note that this does not yet define any particular counters,
just the infrastructure needed to add them.
Bug: 160734914
Test: m test-art-host-gtest-art_libartbase_tests
Change-Id: Ideabadbf3cca222911da357af56c7ebc2ab637fd
diff --git a/libartbase/base/metrics_test.cc b/libartbase/base/metrics_test.cc
new file mode 100644
index 0000000..30d2356
--- /dev/null
+++ b/libartbase/base/metrics_test.cc
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "metrics.h"
+
+#include "gtest/gtest.h"
+
+#pragma clang diagnostic push
+#pragma clang diagnostic error "-Wconversion"
+
+namespace art {
+namespace metrics {
+
+class MetricsTest : public testing::Test {};
+
+TEST_F(MetricsTest, SimpleCounter) {
+ MetricsCounter test_counter;
+
+ EXPECT_EQ(0u, test_counter.Value());
+
+ test_counter.AddOne();
+ EXPECT_EQ(1u, test_counter.Value());
+
+ test_counter.Add(5);
+ EXPECT_EQ(6u, test_counter.Value());
+}
+
+TEST_F(MetricsTest, DatumName) {
+ EXPECT_EQ("ClassVerificationTotalTime", DatumName(DatumId::kClassVerificationTotalTime));
+}
+
+} // namespace metrics
+} // namespace art
+
+#pragma clang diagnostic pop // -Wconversion