1 /*
2 * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 package compiler.valhalla.valuetypes;
25
26 import compiler.whitebox.CompilerWhiteBoxTest;
27 import jdk.test.lib.Asserts;
28 import jdk.test.lib.management.InputArguments;
29 import jdk.test.lib.Platform;
30 import jdk.test.lib.process.ProcessTools;
31 import jdk.test.lib.process.OutputAnalyzer;
32 import jdk.test.lib.Utils;
33 import sun.hotspot.WhiteBox;
34
35 import java.lang.annotation.Retention;
36 import java.lang.annotation.RetentionPolicy;
37 import java.lang.annotation.Repeatable;
38 import java.lang.invoke.*;
39 import java.lang.reflect.Method;
40 import java.util.ArrayList;
41 import java.util.Arrays;
42 import java.util.Hashtable;
43 import java.util.LinkedHashMap;
44 import java.util.List;
45 import java.util.Map;
46 import java.util.regex.Matcher;
47 import java.util.regex.Pattern;
48 import java.util.TreeMap;
49
50 // Mark method as test
51 @Retention(RetentionPolicy.RUNTIME)
52 @Repeatable(Tests.class)
53 @interface Test {
54 // Regular expression used to match forbidden IR nodes
55 // in the C2 IR emitted for this test.
56 String failOn() default "";
57 // Regular expressions used to match and count IR nodes.
58 String[] match() default { };
59 int[] matchCount() default { };
60 int valid() default ValueTypeTest.AllFlags;
61 }
62
63 @Retention(RetentionPolicy.RUNTIME)
64 @interface Tests {
65 Test[] value();
66 }
67
68 // Force method inlining during compilation
69 @Retention(RetentionPolicy.RUNTIME)
70 @interface ForceInline { }
71
72 // Prevent method inlining during compilation
73 @Retention(RetentionPolicy.RUNTIME)
74 @interface DontInline { }
75
76 // Prevent method compilation
77 @Retention(RetentionPolicy.RUNTIME)
78 @interface DontCompile { }
79
80 // Number of warmup iterations
81 @Retention(RetentionPolicy.RUNTIME)
82 @interface Warmup {
83 int value();
84 }
85
86 public abstract class ValueTypeTest {
87 // Random test values
88 public static final int rI = Utils.getRandomInstance().nextInt() % 1000;
89 public static final long rL = Utils.getRandomInstance().nextLong() % 1000;
90
91 // User defined settings
92 private static final boolean PRINT_GRAPH = true;
93 private static final boolean PRINT_TIMES = Boolean.parseBoolean(System.getProperty("PrintTimes", "false"));
94 private static boolean VERIFY_IR = Boolean.parseBoolean(System.getProperty("VerifyIR", "true"));
95 private static final boolean VERIFY_VM = Boolean.parseBoolean(System.getProperty("VerifyVM", "false"));
96 private static final String SCENARIOS = System.getProperty("Scenarios", "");
97 private static final String TESTLIST = System.getProperty("Testlist", "");
98 private static final String EXCLUDELIST = System.getProperty("Exclude", "");
99 private static final int WARMUP = Integer.parseInt(System.getProperty("Warmup", "251"));
100 private static final boolean DUMP_REPLAY = Boolean.parseBoolean(System.getProperty("DumpReplay", "false"));
101
102 // Pre-defined settings
103 private static final List<String> defaultFlags = Arrays.asList(
104 "-XX:-BackgroundCompilation", "-XX:CICompilerCount=1",
105 "-XX:+PrintCompilation", "-XX:+PrintIdeal", "-XX:+PrintOptoAssembly",
106 "-XX:CompileCommand=quiet",
107 "-XX:CompileCommand=compileonly,java.lang.invoke.*::*",
108 "-XX:CompileCommand=compileonly,java.lang.Long::sum",
109 "-XX:CompileCommand=compileonly,java.lang.Object::<init>",
110 "-XX:CompileCommand=compileonly,compiler.valhalla.valuetypes.*::*");
111 private static final List<String> verifyFlags = Arrays.asList(
112 "-XX:+VerifyOops", "-XX:+VerifyStack", "-XX:+VerifyLastFrame", "-XX:+VerifyBeforeGC", "-XX:+VerifyAfterGC",
113 "-XX:+VerifyDuringGC", "-XX:+VerifyAdapterSharing");
114
115 protected static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
116 protected static final int ValueTypePassFieldsAsArgsOn = 0x1;
117 protected static final int ValueTypePassFieldsAsArgsOff = 0x2;
118 protected static final int ValueTypeArrayFlattenOn = 0x4;
119 protected static final int ValueTypeArrayFlattenOff = 0x8;
120 protected static final int ValueTypeReturnedAsFieldsOn = 0x10;
121 protected static final int ValueTypeReturnedAsFieldsOff = 0x20;
122 static final int AllFlags = ValueTypePassFieldsAsArgsOn | ValueTypePassFieldsAsArgsOff | ValueTypeArrayFlattenOn | ValueTypeArrayFlattenOff | ValueTypeReturnedAsFieldsOn;
123 protected static final boolean ValueTypePassFieldsAsArgs = (Boolean)WHITE_BOX.getVMFlag("ValueTypePassFieldsAsArgs");
124 protected static final boolean ValueTypeArrayFlatten = (Boolean)WHITE_BOX.getVMFlag("ValueArrayFlatten");
125 protected static final boolean ValueTypeReturnedAsFields = (Boolean)WHITE_BOX.getVMFlag("ValueTypeReturnedAsFields");
126 protected static final boolean NullableValueTypes = (Boolean)WHITE_BOX.getVMFlag("NullableValueTypes");
127 protected static final int COMP_LEVEL_ANY = -2;
128 protected static final int COMP_LEVEL_FULL_OPTIMIZATION = 4;
129 protected static final Hashtable<String, Method> tests = new Hashtable<String, Method>();
130 protected static final boolean USE_COMPILER = WHITE_BOX.getBooleanVMFlag("UseCompiler");
131 protected static final boolean PRINT_IDEAL = WHITE_BOX.getBooleanVMFlag("PrintIdeal");
132 protected static final boolean XCOMP = Platform.isComp();
133
134 // Regular expressions used to match nodes in the PrintIdeal output
135 protected static final String START = "(\\d+\\t(.*";
136 protected static final String MID = ".*)+\\t===.*";
137 protected static final String END = ")|";
138 protected static final String ALLOC = "(.*precise klass compiler/valhalla/valuetypes/MyValue.*\\R(.*(nop|spill).*\\R)*.*_new_instance_Java" + END;
139 protected static final String ALLOCA = "(.*precise klass \\[Lcompiler/valhalla/valuetypes/MyValue.*\\R(.*(nop|spill).*\\R)*.*_new_array_Java" + END;
140 protected static final String LOAD = START + "Load(B|S|I|L|F|D|P|N)" + MID + "@compiler/valhalla/valuetypes/MyValue.*" + END;
141 protected static final String LOADK = START + "LoadK" + MID + END;
142 protected static final String STORE = START + "Store(B|C|S|I|L|F|D|P|N)" + MID + "@compiler/valhalla/valuetypes/MyValue.*" + END;
143 protected static final String LOOP = START + "Loop" + MID + "" + END;
144 protected static final String TRAP = START + "CallStaticJava" + MID + "uncommon_trap.*(unstable_if|predicate)" + END;
145 protected static final String RETURN = START + "Return" + MID + "returns" + END;
146 protected static final String LINKTOSTATIC = START + "CallStaticJava" + MID + "linkToStatic" + END;
147 protected static final String NPE = START + "CallStaticJava" + MID + "null_check" + END;
148 protected static final String CALL = START + "CallStaticJava" + MID + END;
149 protected static final String STOREVALUETYPEFIELDS = START + "CallStaticJava" + MID + "store_value_type_fields" + END;
150 protected static final String SCOBJ = "(.*# ScObj.*" + END;
151
152 public static String[] concat(String prefix[], String... extra) {
153 ArrayList<String> list = new ArrayList<String>();
154 if (prefix != null) {
155 for (String s : prefix) {
156 list.add(s);
157 }
158 }
159 if (extra != null) {
160 for (String s : extra) {
161 list.add(s);
162 }
163 }
164
165 return list.toArray(new String[list.size()]);
166 }
167
168 /**
169 * Override getNumScenarios and getVMParameters if you want to run with more than
170 * the 5 built-in scenarios
171 */
172 public int getNumScenarios() {
173 return 5;
174 }
175
176 /**
177 * VM paramaters for the 5 built-in test scenarios. If your test needs to append
178 * extra parameters for (some of) these scenarios, override getExtraVMParameters().
179 */
180 public String[] getVMParameters(int scenario) {
181 switch (scenario) {
182 case 0: return new String[] {
183 "-XX:+AlwaysIncrementalInline",
184 "-XX:ValueArrayElemMaxFlatOops=-1",
185 "-XX:ValueArrayElemMaxFlatSize=-1",
186 "-XX:+ValueArrayFlatten",
187 "-XX:ValueFieldMaxFlatSize=-1",
188 "-XX:+ValueTypePassFieldsAsArgs",
189 "-XX:+ValueTypeReturnedAsFields"};
190 case 1: return new String[] {
191 "-XX:-UseCompressedOops",
192 "-XX:ValueArrayElemMaxFlatOops=-1",
193 "-XX:ValueArrayElemMaxFlatSize=-1",
194 "-XX:+ValueArrayFlatten",
195 "-XX:ValueFieldMaxFlatSize=-1",
196 "-XX:-ValueTypePassFieldsAsArgs",
197 "-XX:-ValueTypeReturnedAsFields"};
198 case 2: return new String[] {
199 "-DVerifyIR=false",
200 "-XX:-UseCompressedOops",
201 "-XX:ValueArrayElemMaxFlatOops=0",
202 "-XX:ValueArrayElemMaxFlatSize=0",
203 "-XX:-ValueArrayFlatten",
204 "-XX:ValueFieldMaxFlatSize=0",
205 "-XX:+ValueTypePassFieldsAsArgs",
206 "-XX:+ValueTypeReturnedAsFields",
207 "-XX:+StressValueTypePassFieldsAsArgs",
208 "-XX:+StressValueTypeReturnedAsFields"};
209 case 3: return new String[] {
210 "-DVerifyIR=false",
211 "-XX:+AlwaysIncrementalInline",
212 "-XX:ValueArrayElemMaxFlatOops=0",
213 "-XX:ValueArrayElemMaxFlatSize=0",
214 "-XX:ValueFieldMaxFlatSize=0",
215 "-XX:-ValueTypePassFieldsAsArgs",
216 "-XX:-ValueTypeReturnedAsFields"};
217 case 4: return new String[] {
218 "-DVerifyIR=false",
219 "-XX:ValueArrayElemMaxFlatOops=-1",
220 "-XX:ValueArrayElemMaxFlatSize=-1",
221 "-XX:+ValueArrayFlatten",
222 "-XX:ValueFieldMaxFlatSize=0",
223 "-XX:+ValueTypePassFieldsAsArgs",
224 "-XX:-ValueTypeReturnedAsFields",
225 "-XX:+StressValueTypePassFieldsAsArgs"};
226 }
227
228 return null;
229 }
230
231 /**
232 * Override this method to provide extra parameters for selected scenarios
233 */
234 public String[] getExtraVMParameters(int scenario) {
235 return null;
236 }
237
238 public static void main(String[] args) throws Throwable {
239 if (args.length != 1) {
240 throw new RuntimeException("Usage: @run main/othervm/timeout=120 -Xbootclasspath/a:. -ea" +
241 " -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions" +
242 " -XX:+UnlockExperimentalVMOptions -XX:+WhiteBoxAPI -XX:+EnableValhalla" +
243 " compiler.valhalla.valuetypes.ValueTypeTest <YourTestMainClass>");
244 }
245 String testMainClassName = args[0];
246 Class testMainClass = Class.forName(testMainClassName);
247 ValueTypeTest test = (ValueTypeTest)testMainClass.newInstance();
248 List<String> scenarios = null;
249 if (!SCENARIOS.isEmpty()) {
250 scenarios = Arrays.asList(SCENARIOS.split(","));
251 }
252 for (int i=0; i<test.getNumScenarios(); i++) {
253 if (scenarios == null || scenarios.contains(Integer.toString(i))) {
254 System.out.println("Scenario #" + i + " -------- ");
255 String[] cmds = InputArguments.getVmInputArgs();
256 cmds = concat(cmds, test.getVMParameters(i));
257 cmds = concat(cmds, test.getExtraVMParameters(i));
258 cmds = concat(cmds, testMainClassName);
259
260 OutputAnalyzer oa = ProcessTools.executeTestJvm(cmds);
261 String output = oa.getOutput();
262 oa.shouldHaveExitValue(0);
263 System.out.println(output);
264 } else {
265 System.out.println("Scenario #" + i + " is skipped due to -Dscenarios=" + SCENARIOS);
266 }
267 }
268 }
269
270 protected ValueTypeTest() {
271 List<String> list = null;
272 List<String> exclude = null;
273 if (!TESTLIST.isEmpty()) {
274 list = Arrays.asList(TESTLIST.split(","));
275 }
276 if (!EXCLUDELIST.isEmpty()) {
277 exclude = Arrays.asList(EXCLUDELIST.split(","));
278 }
279 // Gather all test methods and put them in Hashtable
280 for (Method m : getClass().getDeclaredMethods()) {
281 Test[] annos = m.getAnnotationsByType(Test.class);
282 if (annos.length != 0 &&
283 ((list == null || list.contains(m.getName())) && (exclude == null || !exclude.contains(m.getName())))) {
284 tests.put(getClass().getSimpleName() + "::" + m.getName(), m);
285 }
286 }
287 }
288
289 protected void run(String[] args, Class<?>... classes) throws Throwable {
290 if (args.length == 0) {
291 // Spawn a new VM instance
292 execute_vm();
293 } else {
294 // Execute tests
295 run(classes);
296 }
297 }
298
299 private void execute_vm() throws Throwable {
300 Asserts.assertFalse(tests.isEmpty(), "no tests to execute");
301 ArrayList<String> args = new ArrayList<String>(defaultFlags);
302 String[] vmInputArgs = InputArguments.getVmInputArgs();
303 if (VERIFY_IR) {
304 for (String arg : vmInputArgs) {
305 if (arg.startsWith("-XX:CompileThreshold")) {
306 // Disable IR verification if
307 VERIFY_IR = false;
308 }
309 // Check if the JVM supports value type specific default arguments from the test's run commands
310 if (arg.startsWith("-XX:+ValueTypePassFieldsAsArgs") ||
311 arg.startsWith("-XX:+ValueTypeReturnedAsFields")) {
312 Boolean value = (Boolean)WHITE_BOX.getVMFlag(arg.substring(5));
313 if (!value) {
314 System.out.println("WARNING: could not enable " + arg.substring(5) + ". Skipping IR verification.");
315 VERIFY_IR = false;
316 }
317 } else if (arg.startsWith("-XX:-ValueTypePassFieldsAsArgs") ||
318 arg.startsWith("-XX:-ValueTypeReturnedAsFields")) {
319 Boolean value = (Boolean)WHITE_BOX.getVMFlag(arg.substring(5));
320 if (value) {
321 System.out.println("WARNING: could not disable " + arg.substring(5) + ". Skipping IR verification.");
322 VERIFY_IR = false;
323 }
324 }
325 }
326 // Always trap for exception throwing to not confuse IR verification
327 args.add("-XX:-OmitStackTraceInFastThrow");
328 }
329 if (VERIFY_VM) {
330 args.addAll(verifyFlags);
331 }
332 // Run tests in own process and verify output
333 args.add(getClass().getName());
334 args.add("run");
335 // Spawn process with default JVM options from the test's run command
336 String[] cmds = Arrays.copyOf(vmInputArgs, vmInputArgs.length + args.size());
337 System.arraycopy(args.toArray(), 0, cmds, vmInputArgs.length, args.size());
338 OutputAnalyzer oa = ProcessTools.executeTestJvm(cmds);
339 // If ideal graph printing is enabled/supported, verify output
340 String output = oa.getOutput();
341 oa.shouldHaveExitValue(0);
342 if (VERIFY_IR) {
343 if (output.contains("PrintIdeal enabled")) {
344 parseOutput(output);
345 } else {
346 System.out.println(output);
347 System.out.println("WARNING: IR verification failed! Running with -Xint, -Xcomp or release build?");
348 }
349 }
350 }
351
352 private void parseOutput(String output) throws Exception {
353 Pattern comp_re = Pattern.compile("\\n\\s+\\d+\\s+\\d+\\s+(%| )(s| )(!| )b(n| )\\s+\\S+\\.(?<name>[^.]+::\\S+)\\s+(?<osr>@ \\d+\\s+)?[(]\\d+ bytes[)]\\n");
354 Matcher m = comp_re.matcher(output);
355 Map<String,String> compilations = new LinkedHashMap<>();
356 int prev = 0;
357 String methodName = null;
358 while (m.find()) {
359 if (prev == 0) {
360 // Print header
361 System.out.print(output.substring(0, m.start()+1));
362 } else if (methodName != null) {
363 compilations.put(methodName, output.substring(prev, m.start()+1));
364 }
365 if (m.group("osr") != null) {
366 methodName = null;
367 } else {
368 methodName = m.group("name");
369 }
370 prev = m.end();
371 }
372 if (prev == 0) {
373 // Print header
374 System.out.print(output);
375 } else if (methodName != null) {
376 compilations.put(methodName, output.substring(prev));
377 }
378 // Iterate over compilation output
379 for (String testName : compilations.keySet()) {
380 Method test = tests.get(testName);
381 if (test == null) {
382 // Skip helper methods
383 continue;
384 }
385 String graph = compilations.get(testName);
386 if (PRINT_GRAPH) {
387 System.out.println("\nGraph for " + testName + "\n" + graph);
388 }
389 // Parse graph using regular expressions to determine if it contains forbidden nodes
390 Test[] annos = test.getAnnotationsByType(Test.class);
391 Test anno = null;
392 for (Test a : annos) {
393 if ((a.valid() & ValueTypePassFieldsAsArgsOn) != 0 && ValueTypePassFieldsAsArgs) {
394 assert anno == null;
395 anno = a;
396 } else if ((a.valid() & ValueTypePassFieldsAsArgsOff) != 0 && !ValueTypePassFieldsAsArgs) {
397 assert anno == null;
398 anno = a;
399 } else if ((a.valid() & ValueTypeArrayFlattenOn) != 0 && ValueTypeArrayFlatten) {
400 assert anno == null;
401 anno = a;
402 } else if ((a.valid() & ValueTypeArrayFlattenOff) != 0 && !ValueTypeArrayFlatten) {
403 assert anno == null;
404 anno = a;
405 } else if ((a.valid() & ValueTypeReturnedAsFieldsOn) != 0 && ValueTypeReturnedAsFields) {
406 assert anno == null;
407 anno = a;
408 } else if ((a.valid() & ValueTypeReturnedAsFieldsOff) != 0 && !ValueTypeReturnedAsFields) {
409 assert anno == null;
410 anno = a;
411 }
412 }
413 assert anno != null;
414 String regexFail = anno.failOn();
415 if (!regexFail.isEmpty()) {
416 Pattern pattern = Pattern.compile(regexFail.substring(0, regexFail.length()-1));
417 Matcher matcher = pattern.matcher(graph);
418 boolean found = matcher.find();
419 Asserts.assertFalse(found, "Graph for '" + testName + "' contains forbidden node:\n" + (found ? matcher.group() : ""));
420 }
421 String[] regexMatch = anno.match();
422 int[] matchCount = anno.matchCount();
423 for (int i = 0; i < regexMatch.length; ++i) {
424 Pattern pattern = Pattern.compile(regexMatch[i].substring(0, regexMatch[i].length()-1));
425 Matcher matcher = pattern.matcher(graph);
426 int count = 0;
427 String nodes = "";
428 while (matcher.find()) {
429 count++;
430 nodes += matcher.group() + "\n";
431 }
432 if (matchCount[i] < 0) {
433 Asserts.assertLTE(Math.abs(matchCount[i]), count, "Graph for '" + testName + "' contains different number of match nodes:\n" + nodes);
434 } else {
435 Asserts.assertEQ(matchCount[i], count, "Graph for '" + testName + "' contains different number of match nodes:\n" + nodes);
436 }
437 }
438 tests.remove(testName);
439 System.out.println(testName + " passed");
440 }
441 // Check if all tests were compiled
442 if (tests.size() != 0) {
443 for (String name : tests.keySet()) {
444 System.out.println("Test '" + name + "' not compiled!");
445 }
446 throw new RuntimeException("Not all tests were compiled");
447 }
448 }
449
450 private void setup(Class<?> clazz) {
451 if (XCOMP) {
452 // Don't control compilation if -Xcomp is enabled
453 return;
454 }
455 if (DUMP_REPLAY) {
456 // Generate replay compilation files
457 String directive = "[{ match: \"*.*\", DumpReplay: true }]";
458 if (WHITE_BOX.addCompilerDirective(directive) != 1) {
459 throw new RuntimeException("Failed to add compiler directive");
460 }
461 }
462
463 Method[] methods = clazz.getDeclaredMethods();
464 for (Method m : methods) {
465 if (m.isAnnotationPresent(Test.class)) {
466 // Don't inline tests
467 WHITE_BOX.testSetDontInlineMethod(m, true);
468 }
469 if (m.isAnnotationPresent(DontCompile.class)) {
470 WHITE_BOX.makeMethodNotCompilable(m, COMP_LEVEL_ANY, true);
471 WHITE_BOX.makeMethodNotCompilable(m, COMP_LEVEL_ANY, false);
472 WHITE_BOX.testSetDontInlineMethod(m, true);
473 }
474 if (m.isAnnotationPresent(ForceInline.class)) {
475 WHITE_BOX.testSetForceInlineMethod(m, true);
476 } else if (m.isAnnotationPresent(DontInline.class)) {
477 WHITE_BOX.testSetDontInlineMethod(m, true);
478 }
479 }
480
481 // Compile class initializers
482 WHITE_BOX.enqueueInitializerForCompilation(clazz, COMP_LEVEL_FULL_OPTIMIZATION);
483 }
484
485 private void run(Class<?>... classes) throws Exception {
486 if (USE_COMPILER && PRINT_IDEAL && !XCOMP) {
487 System.out.println("PrintIdeal enabled");
488 }
489 System.out.format("rI = %d, rL = %d\n", rI, rL);
490
491 setup(getClass());
492 for (Class<?> clazz : classes) {
493 setup(clazz);
494 }
495
496 // Execute tests
497 TreeMap<Long, String> durations = PRINT_TIMES ? new TreeMap<Long, String>() : null;
498 for (Method test : tests.values()) {
499 long startTime = System.nanoTime();
500 Method verifier = getClass().getMethod(test.getName() + "_verifier", boolean.class);
501 // Warmup using verifier method
502 Warmup anno = test.getAnnotation(Warmup.class);
503 int warmup = anno == null ? WARMUP : anno.value();
504 for (int i = 0; i < warmup; ++i) {
505 verifier.invoke(this, true);
506 }
507 // Trigger compilation
508 WHITE_BOX.enqueueMethodForCompilation(test, COMP_LEVEL_FULL_OPTIMIZATION);
509 Asserts.assertTrue(!USE_COMPILER || WHITE_BOX.isMethodCompiled(test, false), test + " not compiled");
510 // Check result
511 verifier.invoke(this, false);
512 if (PRINT_TIMES) {
513 long endTime = System.nanoTime();
514 long duration = (endTime - startTime);
515 durations.put(duration, test.getName());
516 }
517 }
518
519 // Print execution times
520 if (PRINT_TIMES) {
521 System.out.println("\n\nTest execution times:");
522 for (Map.Entry<Long, String> entry : durations.entrySet()) {
523 System.out.format("%-10s%15d ns\n", entry.getValue() + ":", entry.getKey());
524 }
525 }
526 }
527 }