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+/*
+ * Copyright (C) 2016 Linaro Limited.
+ *
+ * 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.
+ */
+
+/*
+ * This benchmark is inspired by benchmarks/caffeinemark.
+ * Original benchmark implements a recursion method which calls itself with invoke-virtual.
+ *
+ * This behavior can be different on JIT and AOT mode, because:
+ * - JIT mode can optimize invoke-virtual with inline cache mechanism.
+ * - AOT mode has no such optimization.
+ *
+ * This benchmark exposes such difference between ART JIT and AOT mode.
+ */
+
+package org.linaro.benchmarks.jit_aot;
+
+import org.openjdk.jmh.annotations.*;
+import java.util.concurrent.TimeUnit;
+
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.NANOSECONDS)
+@State(Scope.Benchmark)
+
+public class Invoke {
+
+ public int recursionInvokeVirtual(int i) {
+ if (i == 0) {
+ return 0;
+ } else {
+ return i + recursionInvokeVirtual(i - 1);
+ }
+ }
+
+ public static int recursionInvokeStatic(int i) {
+ if (i == 0) {
+ return 0;
+ } else {
+ return i + recursionInvokeStatic(i - 1);
+ }
+ }
+
+ public final int recursionInvokeFinal(int i) {
+ if (i == 0) {
+ return 0;
+ } else {
+ return i + recursionInvokeFinal(i - 1);
+ }
+ }
+
+ private int recursionInvokePrivate(int i) {
+ if (i == 0) {
+ return 0;
+ } else {
+ return i + recursionInvokePrivate(i - 1);
+ }
+ }
+
+ private static final int recursion_depth = 1000;
+
+ @Benchmark
+ public void jmhTimeRecursionInvokeVirtual() {
+ recursionInvokeVirtual(recursion_depth);
+ }
+
+ @Benchmark
+ public void jmhTimeRecursionInvokeStatic() {
+ recursionInvokeStatic(recursion_depth);
+ }
+
+ @Benchmark
+ public void jmhTimeRecursionInvokeFinal() {
+ recursionInvokeFinal(recursion_depth);
+ }
+
+ @Benchmark
+ public void jmhTimeRecursionInvokePrivate() {
+ recursionInvokePrivate(recursion_depth);
+ }
+}