--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/micro/org/openjdk/bench/vm/lang/ThrowableRuntimeMicros.java Wed Sep 25 14:33:44 2019 -0700
@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 2015, 2019 Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package org.openjdk.bench.vm.lang;
+
+import java.util.concurrent.TimeUnit;
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Param;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.infra.Blackhole;
+
+@State(value = Scope.Benchmark)
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.NANOSECONDS)
+public class ThrowableRuntimeMicros {
+
+ // TestStack will add this number of calls to the call stack
+ @Param({"4", "100", "1000"})
+ // For more thorough testing, consider:
+ // @Param({"4", "10", "100", "256", "1000"})
+ public int depth;
+
+ /** Build a call stack of a given size, then run trigger code in it.
+ * (Does not account for existing frames higher up in the JMH machinery).
+ */
+ static class TestStack {
+ final long fence;
+ long current;
+ final Runnable trigger;
+
+ TestStack(long max, Runnable trigger) {
+ this.fence = max;
+ this.current = 0;
+ this.trigger = trigger;
+ }
+
+ public void start() {
+ one();
+ }
+
+ public void one() {
+ if (check()) {
+ two();
+ }
+ }
+
+ void two() {
+ if (check()) {
+ three();
+ }
+ }
+
+ private void three() {
+ if (check()) {
+ one();
+ }
+ }
+
+ boolean check() {
+ if (++current == fence) {
+ trigger.run();
+ return false;
+ } else {
+ return true;
+ }
+ }
+ }
+
+ @Benchmark
+ public void testThrowableInit(Blackhole bh) {
+ final Blackhole localBH = bh;
+ final boolean[] done = {false};
+ new TestStack(depth, new Runnable() {
+ public void run() {
+ localBH.consume(new Throwable());
+ done[0] = true;
+ }
+ }).start();
+ if (!done[0]) {
+ throw new RuntimeException();
+ }
+ }
+
+ @Benchmark
+ public void testThrowableGetStackTrace(Blackhole bh) {
+ final Blackhole localBH = bh;
+ final boolean[] done = {false};
+ new TestStack(depth, new Runnable() {
+ public void run() {
+ localBH.consume(new Throwable().getStackTrace());
+ done[0] = true;
+ }
+ }).start();
+ if (!done[0]) {
+ throw new RuntimeException();
+ }
+ }
+
+ @Benchmark
+ public void testThrowableSTEtoString(Blackhole bh) {
+ final Blackhole localBH = bh;
+ final boolean[] done = {false};
+ new TestStack(depth, new Runnable() {
+ public void run() {
+ Throwable t = new Throwable();
+ for (StackTraceElement ste : t.getStackTrace()) {
+ localBH.consume(ste.toString());
+ }
+ done[0] = true;
+ }
+ }).start();
+ if (!done[0]) {
+ throw new RuntimeException();
+ }
+ }
+}