1 /*
  2  * Copyright (c) 2021, 2022, 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.lib.ir_framework;
 25 
 26 import compiler.lib.ir_framework.driver.FlagVMProcess;
 27 import compiler.lib.ir_framework.driver.TestVMException;
 28 import compiler.lib.ir_framework.driver.TestVMProcess;
 29 import compiler.lib.ir_framework.driver.irmatching.IRMatcher;
 30 import compiler.lib.ir_framework.driver.irmatching.IRViolationException;
 31 import compiler.lib.ir_framework.driver.irmatching.Matchable;
 32 import compiler.lib.ir_framework.driver.irmatching.parser.MethodCompilationParser;
 33 import compiler.lib.ir_framework.shared.*;
 34 import compiler.lib.ir_framework.test.TestVM;
 35 import jdk.test.lib.Platform;
 36 import jdk.test.lib.Utils;
 37 import jdk.test.lib.helpers.ClassFileInstaller;
 38 import jdk.test.whitebox.WhiteBox;
 39 
 40 import java.io.PrintWriter;
 41 import java.io.StringWriter;
 42 import java.lang.reflect.Method;
 43 import java.net.MalformedURLException;
 44 import java.net.URL;
 45 import java.net.URLClassLoader;
 46 import java.nio.file.Path;
 47 import java.util.*;
 48 import java.util.stream.Collectors;
 49 
 50 /**
 51  * This class represents the main entry point to the test framework whose main purpose is to perform regex-based checks on
 52  * the C2 IR shape emitted by the VM flags {@code -XX:+PrintIdeal} and {@code -XX:+PrintOptoAssembly}. The framework can
 53  * also be used for other non-IR matching (and non-compiler) tests by providing easy to use annotations for commonly used
 54  * testing patterns and compiler control flags.
 55  * <p>
 56  * The framework offers various annotations to control how your test code should be invoked and being checked. There are
 57  * three kinds of tests depending on how much control is needed over the test invocation:
 58  * <b>Base tests</b> (see {@link Test}), <b>checked tests</b> (see {@link Check}), and <b>custom run tests</b>
 59  * (see {@link Run}). Each type of test needs to define a unique <i>test method</i> that specifies a {@link Test @Test}
 60  * annotation which represents the test code that is eventually executed by the test framework. More information about
 61  * the usage and how to write different tests can be found in {@link Test}, {@link Check}, and {@link Run}.
 62  * <p>
 63  * Each test method can specify an arbitrary number of IR rules. This is done by using {@link IR @IR} annotations which
 64  * can define regex strings that are matched on the output of {@code -XX:+PrintIdeal} and {@code -XX:+PrintOptoAssembly}.
 65  * The matching is done after the test method was (optionally) warmed up and compiled. More information about the usage
 66  * and how to write different IR rules can be found at {@link IR}.
 67  * <p>
 68  * This framework should be used with the following JTreg setup in your Test.java file in package <i>some.package</i>:
 69  * <pre>
 70  * {@literal @}library /test/lib
 71  * {@literal @}run driver some.package.Test
 72  * </pre>
 73  * Note that even though the framework uses the Whitebox API internally, it is not required to build and enabel it in the
 74  * JTreg test if the test itself is not utilizing any Whitebox features directly.
 75  * <p>
 76  * To specify additional flags, use {@link #runWithFlags(String...)}, {@link #addFlags(String...)}, or
 77  * {@link #addScenarios(Scenario...)} where the scenarios can also be used to run different flag combinations
 78  * (instead of specifying multiple JTreg {@code @run} entries).
 79  * <p>
 80  * After annotating your test code with the framework specific annotations, the framework needs to be invoked from the
 81  * {@code main()} method of your JTreg test. There are two ways to do so. The first way is by calling the various
 82  * {@code runXX()} methods of {@link TestFramework}. The second way, which gives more control, is to create a new
 83  * {@code TestFramework} builder object on which {@link #start()} needs to be eventually called to start the testing.
 84  * <p>
 85  * The framework is called from the <i>driver VM</i> in which the JTreg test is initially run by specifying {@code
 86  * @run driver} in the JTreg header. This strips all additionally specified JTreg VM and Javaoptions.
 87  * The framework creates a new <i>flag VM</i> with all these flags added again in order to figure out which flags are
 88  * required to run the tests specified in the test class (e.g. {@code -XX:+PrintIdeal} and {@code -XX:+PrintOptoAssembly}
 89  * for IR matching).
 90  * <p>
 91  * After the flag VM terminates, it starts a new <i>test VM</i> which performs the execution of the specified
 92  * tests in the test class as described in {@link Test}, {@link Check}, and {@link Run}.
 93  * <p>
 94  * In a last step, once the test VM has terminated without exceptions, IR matching is performed if there are any IR
 95  * rules and if no VM flags disable it (e.g. not running with {@code -Xint}, see {@link IR} for more details).
 96  * The IR regex matching is done on the output of {@code -XX:+PrintIdeal} and {@code -XX:+PrintOptoAssembly} by parsing
 97  * the hotspot_pid file of the test VM. Failing IR rules are reported by throwing a {@link IRViolationException}.
 98  *
 99  * @see Test
100  * @see Check
101  * @see Run
102  * @see IR
103  */
104 public class TestFramework {
105     /**
106      * JTreg can define additional VM (-Dtest.vm.opts) and Javaoptions (-Dtest.java.opts) flags. IR verification is only
107      * performed when all these additional JTreg flags (does not include additionally added framework and scenario flags
108      * by user code) are whitelisted.
109      *
110      * <p>
111      * A flag is whitelisted if it is a property flag (starting with -D), -ea, -esa, or if the flag name contains any of
112      * the entries of this list as a substring (partial match).
113      */
114     public static final Set<String> JTREG_WHITELIST_FLAGS = new HashSet<>(
115             Arrays.asList(
116                     // The following substrings are part of more than one VM flag
117                     "RAM",
118                     "Heap",
119                     "Trace",
120                     "Print",
121                     "Verify",
122                     "TLAB",
123                     "UseNewCode",
124                     "Xmn",
125                     "Xms",
126                     "Xmx",
127                     "Xss",
128                     // The following substrings are only part of one VM flag (=exact match)
129                     "CreateCoredumpOnCrash",
130                     "IgnoreUnrecognizedVMOptions",
131                     "UnlockDiagnosticVMOptions",
132                     "UnlockExperimentalVMOptions",
133                     "BackgroundCompilation",
134                     "Xbatch",
135                     "TieredCompilation",
136                     "CompileThreshold",
137                     "Xmixed",
138                     "server",
139                     "UseAVX",
140                     "UseSSE",
141                     "UseSVE",
142                     "UseZbb",
143                     "UseRVV",
144                     "Xlog",
145                     "LogCompilation"
146             )
147     );
148 
149     public static final boolean VERBOSE = Boolean.getBoolean("Verbose");
150     public static final boolean TESTLIST = !System.getProperty("Test", "").isEmpty();
151     public static final boolean EXCLUDELIST = !System.getProperty("Exclude", "").isEmpty();
152     private static final boolean REPORT_STDOUT = Boolean.getBoolean("ReportStdout");
153     // Only used for internal testing and should not be used for normal user testing.
154 
155     private static final String RERUN_HINT = """
156                                                #############################################################
157                                                 - To only run the failed tests use -DTest, -DExclude,
158                                                   and/or -DScenarios.
159                                                 - To also get the standard output of the test VM run with
160                                                   -DReportStdout=true or for even more fine-grained logging
161                                                   use -DVerbose=true.
162                                                #############################################################
163                                              """ + System.lineSeparator();
164 
165     private boolean irVerificationPossible = Boolean.parseBoolean(System.getProperty("VerifyIR", "true"));
166     private boolean shouldVerifyIR; // Should we perform IR matching?
167     private static boolean toggleBool;
168 
169     private final Class<?> testClass;
170     private Set<Class<?>> helperClasses;
171     private List<Scenario> scenarios;
172     private Set<Integer> scenarioIndices;
173     private List<String> flags;
174     private int defaultWarmup = -1;
175 
176     /*
177      * Public interface methods
178      */
179 
180     /**
181      * Creates an instance acting as a builder to test the class from which this constructor was invoked from.
182      * Use this constructor if you want to use multiple run options (flags, helper classes, scenarios).
183      * Use the associated add methods ({@link #addFlags(String...)}, {@link #addScenarios(Scenario...)},
184      * {@link #addHelperClasses(Class...)}) to set up everything and then start the testing by invoking {@link #start()}.
185      */
186     public TestFramework() {
187         this(StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE).getCallerClass());
188     }
189 
190     /**
191      * Creates an instance acting as a builder to test {@code testClass}.
192      * Use this constructor if you want to use multiple run options (flags, helper classes, scenarios).
193      * Use the associated add methods ({@link #addFlags(String...)}, @link #addScenarios(Scenario...)},
194      * {@link #addHelperClasses(Class...)}) to set up everything and then start the testing by invoking {@link #start()}.
195      *
196      * @param testClass the class to be tested by the framework.
197      * @see #TestFramework()
198      */
199     public TestFramework(Class<?> testClass) {
200         TestRun.check(testClass != null, "Test class cannot be null");
201         this.testClass = testClass;
202         if (VERBOSE) {
203             System.out.println("Test class: " + testClass);
204         }
205     }
206 
207     /**
208      * Tests the class from which this method was invoked from.
209      */
210     public static void run() {
211         StackWalker walker = StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE);
212         run(walker.getCallerClass());
213     }
214 
215     /**
216      * Tests {@code testClass}.
217      *
218      * @param testClass the class to be tested by the framework.
219      * @see #run()
220      */
221     public static void run(Class<?> testClass) {
222         TestFramework framework = new TestFramework(testClass);
223         framework.start();
224     }
225 
226     /**
227      * Tests the class from which this method was invoked from. The test VM is called with the specified {@code flags}.
228      * <ul>
229      *     <li><p>The {@code flags} override any set VM or Javaoptions flags by JTreg by default.<p>
230      *            Use {@code -DPreferCommandLineFlags=true} if you want to prefer the JTreg VM and  Javaoptions flags over
231      *            the specified {@code flags} of this method.</li>
232      *     <li><p>If you want to run your entire JTreg test with additional flags, use this method.</li>
233      *     <li><p>If you want to run your entire JTreg test with additional flags but for another test class then the one
234      *            from which this method was called from, use {@link #addFlags(String...)}, use this method.</li>
235      *     <li><p>If you want to run your JTreg test with multiple flag combinations, use
236      *            {@link #addScenarios(Scenario...)}</li>
237      * </ul>
238      *
239      * @param flags VM flags to be used for the test VM.
240      */
241     public static void runWithFlags(String... flags) {
242         StackWalker walker = StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE);
243         TestFramework framework = new TestFramework(walker.getCallerClass());
244         framework.addFlags(flags);
245         framework.start();
246     }
247 
248     /**
249      * Add VM flags to be used for the test VM. These flags override any VM or Javaoptions set by JTreg by default.<p>
250      * Use {@code -DPreferCommandLineFlags=true} if you want to prefer the VM or Javaoptions over the scenario flags.
251      *
252      * <p>
253      * The testing can be started by invoking {@link #start()}
254      *
255      * @param flags VM options to be applied to the test VM.
256      * @return the same framework instance.
257      */
258     public TestFramework addFlags(String... flags) {
259         TestRun.check(flags != null && Arrays.stream(flags).noneMatch(Objects::isNull), "A flag cannot be null");
260         if (this.flags == null) {
261             this.flags = new ArrayList<>();
262         }
263         this.flags.addAll(Arrays.asList(flags));
264         return this;
265     }
266 
267     /**
268      * Add helper classes that can specify additional compile command annotations ({@link ForceCompile @ForceCompile},
269      * {@link DontCompile @DontCompile}, {@link ForceInline @ForceInline}, {@link DontInline @DontInline}) to be applied
270      * while testing {@code testClass} (also see description of {@link TestFramework}).
271      *
272      * <p>
273      * Duplicates in {@code helperClasses} are ignored. If a class is used by the test class that does not specify any
274      * compile command annotations, you do not need to include it with this method. If no helper class specifies any
275      * compile commands, you do not need to call this method at all.
276      *
277      * <p>
278      * The testing can be started by invoking {@link #start()}.
279      *
280      * @param helperClasses helper classes containing compile command annotations ({@link ForceCompile},
281      *                      {@link DontCompile}, {@link ForceInline}, {@link DontInline}) to be applied
282      *                      while testing {@code testClass} (also see description of {@link TestFramework}).
283      * @return the same framework instance.
284      */
285     public TestFramework addHelperClasses(Class<?>... helperClasses) {
286         TestRun.check(helperClasses != null && Arrays.stream(helperClasses).noneMatch(Objects::isNull),
287                       "A Helper class cannot be null");
288         if (this.helperClasses == null) {
289             this.helperClasses = new HashSet<>();
290         }
291 
292         this.helperClasses.addAll(Arrays.asList(helperClasses));
293         return this;
294     }
295 
296     /**
297      * Add scenarios to be used for the test VM. A test VM is called for each scenario in {@code scenarios} by using the
298      * specified VM flags in the scenario. The scenario flags override any flags set by {@link #addFlags(String...)}
299      * and thus also override any VM or Javaoptions set by JTreg by default.<p>
300      * Use {@code -DPreferCommandLineFlags=true} if you want to prefer the VM and Javaoptions over the scenario flags.
301      *
302      * <p>
303      * The testing can be started by invoking {@link #start()}
304      *
305      * @param scenarios scenarios which specify specific flags for the test VM.
306      * @return the same framework instance.
307      */
308     public TestFramework addScenarios(Scenario... scenarios) {
309         TestFormat.checkAndReport(scenarios != null && Arrays.stream(scenarios).noneMatch(Objects::isNull),
310                                   "A scenario cannot be null");
311         if (this.scenarios == null) {
312             this.scenarios = new ArrayList<>();
313             this.scenarioIndices = new HashSet<>();
314         }
315 
316         for (Scenario scenario : scenarios) {
317             int scenarioIndex = scenario.getIndex();
318             TestFormat.checkNoThrow(scenarioIndices.add(scenarioIndex),
319                              "Cannot define two scenarios with the same index " + scenarioIndex);
320             this.scenarios.add(scenario);
321         }
322         TestFormat.throwIfAnyFailures();
323         return this;
324     }
325 
326     /**
327      * Start the testing of the implicitly (by {@link #TestFramework()}) or explicitly (by {@link #TestFramework(Class)})
328      * set test class.
329      */
330     public void start() {
331         if (shouldInstallWhiteBox()) {
332             installWhiteBox();
333         }
334         checkIRRuleCompilePhasesFormat();
335         disableIRVerificationIfNotFeasible();
336 
337         if (scenarios == null) {
338             try {
339                 start(null);
340             } catch (TestVMException e) {
341                 System.err.println(System.lineSeparator() + e.getExceptionInfo() + RERUN_HINT);
342                 throw e;
343             } catch (IRViolationException e) {
344                 System.out.println(e.getCompilations());
345                 System.err.println(System.lineSeparator() + e.getExceptionInfo() + System.lineSeparator() + RERUN_HINT);
346                 throw e;
347             }
348         } else {
349             startWithScenarios();
350         }
351     }
352 
353     private void checkIRRuleCompilePhasesFormat() {
354         for (Method method : testClass.getDeclaredMethods()) {
355             for (IR irAnno : method.getAnnotationsByType(IR.class)) {
356                 TestFormat.checkNoThrow(irAnno.phase().length > 0,
357                                         "@IR rule " + irAnno + " must specify a non-empty list of compile " +
358                                         "phases \"phase\" at " + method);
359             }
360         }
361         TestFormat.throwIfAnyFailures();
362     }
363 
364     /**
365      * Try to load the Whitebox class from the user directory with a custom class loader. If the user has already built the
366      * Whitebox, we can load it. Otherwise, the framework needs to install it.
367      *
368      * @return true if the framework needs to install the Whitebox
369      */
370     private boolean shouldInstallWhiteBox() {
371         try {
372             URL url = Path.of(System.getProperty("user.dir")).toUri().toURL();
373             URLClassLoader userDirClassLoader =
374                     URLClassLoader.newInstance(new URL[] {url}, TestFramework.class.getClassLoader().getParent());
375             Class.forName(WhiteBox.class.getName(), false, userDirClassLoader);
376         } catch (MalformedURLException e) {
377             throw new TestFrameworkException("corrupted user.dir property", e);
378         } catch (ClassNotFoundException e) {
379             // We need to manually install the WhiteBox if we cannot load the WhiteBox class from the user directory.
380             // This happens when the user test does not explicitly install the WhiteBox as part of the test.
381             return true;
382         }
383         return false;
384     }
385 
386     /**
387      * Set a new default warm-up (overriding the framework default of 2000 at
388      * {@link TestVM#WARMUP_ITERATIONS}) to be applied for all tests that do not specify an explicit
389      * warm-up with {@link Warmup @Warmup}.
390      *
391      * @param defaultWarmup a new non-negative default warm-up.
392      * @return the same framework instance.
393      */
394     public TestFramework setDefaultWarmup(int defaultWarmup) {
395         TestFormat.checkAndReport(defaultWarmup >= 0, "Cannot specify a negative default warm-up");
396         this.defaultWarmup = defaultWarmup;
397         return this;
398     }
399 
400     /**
401      * Get the VM output of the test VM. Use {@code -DVerbose=true} to enable more debug information. If scenarios
402      * were run, use {@link Scenario#getTestVMOutput()}.
403      *
404      * @return the last test VM output.
405      */
406     public static String getLastTestVMOutput() {
407         return TestVMProcess.getLastTestVMOutput();
408     }
409 
410     /*
411      * The following methods are only intended to be called from actual @Test methods and not from the main() method of
412      * a JTreg test. Calling these methods from main() results in a linking exception (Whitebox not yet loaded and enabled).
413      */
414 
415     /**
416      * Compile {@code m} at compilation level {@code compLevel}. {@code m} is first enqueued and might not be compiled,
417      * yet, upon returning from this method.
418      *
419      * @param m the method to be compiled.
420      * @param compLevel the (valid) compilation level at which the method should be compiled.
421      * @throws TestRunException if compilation level is {@link CompLevel#SKIP} or {@link CompLevel#WAIT_FOR_COMPILATION}.
422      */
423     public static void compile(Method m, CompLevel compLevel) {
424         TestVM.compile(m, compLevel);
425     }
426 
427     /**
428      * Deoptimize {@code m}.
429      *
430      * @param m the method to be deoptimized.
431      */
432     public static void deoptimize(Method m) {
433         TestVM.deoptimize(m);
434     }
435 
436     /**
437      * Returns a boolean indicating if {@code m} is compiled at any level.
438      *
439      * @param m the method to be checked.
440      * @return {@code true} if {@code m} is compiled at any level;
441      *         {@code false} otherwise.
442      */
443     public static boolean isCompiled(Method m) {
444         return TestVM.isCompiled(m);
445     }
446 
447     /**
448      * Returns a boolean indicating if {@code m} is compiled with C1.
449      *
450      * @param m the method to be checked.
451      * @return {@code true} if {@code m} is compiled with C1;
452      *         {@code false} otherwise.
453      */
454     public static boolean isC1Compiled(Method m) {
455         return TestVM.isC1Compiled(m);
456     }
457 
458     /**
459      * Returns a boolean indicating if {@code m} is compiled with C2.
460      *
461      * @param m the method to be checked.
462      * @return {@code true} if {@code m} is compiled with C2;
463      *         {@code false} otherwise.
464      */
465     public static boolean isC2Compiled(Method m) {
466         return TestVM.isC2Compiled(m);
467     }
468 
469     /**
470      * Returns a boolean indicating if {@code m} is compiled at the specified {@code compLevel}.
471      *
472      * @param m the method to be checked.
473      * @param compLevel the compilation level.
474      * @return {@code true} if {@code m} is compiled at {@code compLevel};
475      *         {@code false} otherwise.
476      */
477     public static boolean isCompiledAtLevel(Method m, CompLevel compLevel) {
478         return TestVM.isCompiledAtLevel(m, compLevel);
479     }
480 
481     /**
482      * Checks if {@code m} is compiled at any level.
483      *
484      * @param m the method to be checked.
485      * @throws TestRunException if {@code m} is not compiled at any level.
486      */
487     public static void assertCompiled(Method m) {
488         TestVM.assertCompiled(m);
489     }
490 
491     /**
492      * Checks if {@code m} is not compiled at any level.
493      *
494      * @param m the method to be checked.
495      * @throws TestRunException if {@code m} is compiled at any level.
496      */
497     public static void assertNotCompiled(Method m) {
498         TestVM.assertNotCompiled(m);
499     }
500 
501     /**
502      * Verifies that {@code m} is compiled with C1.
503      *
504      * @param m the method to be verified.
505      * @throws TestRunException if {@code m} is not compiled with C1.
506      */
507     public static void assertCompiledByC1(Method m) {
508         TestVM.assertCompiledByC1(m);
509     }
510 
511     /**
512      * Verifies that {@code m} is compiled with C2.
513      *
514      * @param m the method to be checked.
515      * @throws TestRunException if {@code m} is not compiled with C2.
516      */
517     public static void assertCompiledByC2(Method m) {
518         TestVM.assertCompiledByC2(m);
519     }
520 
521     /**
522      * Verifies that {@code m} is compiled at the specified {@code compLevel}.
523      *
524      * @param m the method to be checked.
525      * @param compLevel the compilation level.
526      * @throws TestRunException if {@code m} is not compiled at {@code compLevel}.
527      */
528     public static void assertCompiledAtLevel(Method m, CompLevel compLevel) {
529         TestVM.assertCompiledAtLevel(m, compLevel);
530     }
531 
532     /**
533      * Verifies that {@code m} was deoptimized after being C1 compiled.
534      *
535      * @param m the method to be checked.
536      * @throws TestRunException if {@code m} is was not deoptimized after being C1 compiled.
537      */
538     public static void assertDeoptimizedByC1(Method m) {
539         TestVM.assertDeoptimizedByC1(m);
540     }
541 
542     /**
543      * Verifies that {@code m} was deoptimized after being C2 compiled.
544      *
545      * @param m the method to be checked.
546      * @throws TestRunException if {@code m} is was not deoptimized after being C2 compiled.
547      */
548     public static void assertDeoptimizedByC2(Method m) {
549         TestVM.assertDeoptimizedByC2(m);
550     }
551 












552     /**
553      * Returns a different boolean each time this method is invoked (switching between {@code false} and {@code true}).
554      * The very first invocation returns {@code false}. Note that this method could be used by different tests and
555      * thus the first invocation for a test could be {@code true} or {@code false} depending on how many times
556      * other tests have already invoked this method.
557      *
558      * @return an inverted boolean of the result of the last invocation of this method.
559      */
560     public static boolean toggleBoolean() {
561         toggleBool = !toggleBool;
562         return toggleBool;
563     }
564 
565     /*
566      * End of public interface methods
567      */
568 
569     /**
570      * Used to move Whitebox class to the right folder in the JTreg test
571      */
572     private void installWhiteBox() {
573         try {
574             ClassFileInstaller.main(WhiteBox.class.getName());
575         } catch (Exception e) {
576             throw new Error("failed to install whitebox classes", e);
577         }
578     }
579 
580     /**
581      * Disable IR verification completely in certain cases.
582      */
583     private void disableIRVerificationIfNotFeasible() {
584         if (irVerificationPossible) {
585             irVerificationPossible = Platform.isDebugBuild() && !Platform.isInt() && !Platform.isComp();
586             if (!irVerificationPossible) {
587                 System.out.println("IR verification disabled due to not running a debug build (required for PrintIdeal" +
588                                    "and PrintOptoAssembly), running with -Xint, or -Xcomp (use warm-up of 0 instead)");
589                 return;
590             }
591 
592             irVerificationPossible = hasIRAnnotations();
593             if (!irVerificationPossible) {
594                 System.out.println("IR verification disabled due to test " + testClass + " not specifying any @IR annotations");
595                 return;
596             }
597 
598             // No IR verification is done if additional non-whitelisted JTreg VM or Javaoptions flag is specified.
599             irVerificationPossible = onlyWhitelistedJTregVMAndJavaOptsFlags();
600             if (!irVerificationPossible) {
601                 System.out.println("IR verification disabled due to using non-whitelisted JTreg VM or Javaoptions flag(s)."
602                                    + System.lineSeparator());
603             }
604         }
605     }
606 
607     /**
608      * For scenarios: Run the tests with the scenario settings and collect all exceptions to be able to run all
609      * scenarios without prematurely throwing an exception. Format violations, however, are wrong for all scenarios
610      * and thus is reported immediately on the first scenario execution.
611      */
612     private void startWithScenarios() {
613         Map<Scenario, Exception> exceptionMap = new TreeMap<>(Comparator.comparingInt(Scenario::getIndex));
614         for (Scenario scenario : scenarios) {
615             try {
616                 start(scenario);
617             } catch (TestFormatException e) {
618                 // Test format violation is wrong for all the scenarios. Only report once.
619                 throw e;
620             } catch (Exception e) {
621                 exceptionMap.put(scenario, e);
622             }
623         }
624         if (!exceptionMap.isEmpty()) {
625             reportScenarioFailures(exceptionMap);
626         }
627     }
628 
629     private void reportScenarioFailures(Map<Scenario, Exception> exceptionMap) {
630         String failedScenarios = "The following scenarios have failed: #"
631                                  + exceptionMap.keySet().stream()
632                                                .map(s -> String.valueOf(s.getIndex()))
633                                                .collect(Collectors.joining(", #"));
634         StringBuilder builder = new StringBuilder(failedScenarios);
635         builder.append(System.lineSeparator()).append(System.lineSeparator());
636         for (Map.Entry<Scenario, Exception> entry : exceptionMap.entrySet()) {
637             Exception e = entry.getValue();
638             Scenario scenario = entry.getKey();
639             String errorMsg = "";
640             if (scenario != null) {
641                 errorMsg = getScenarioTitleAndFlags(scenario);
642             }
643             if (e instanceof IRViolationException irException) {
644                 // For IR violations, only show the actual violations and not the (uninteresting) stack trace.
645                 if (scenario != null) {
646                     System.out.println("Scenario #" + scenario.getIndex());
647                 }
648                 System.out.println(irException.getCompilations());
649                 builder.append(errorMsg).append(System.lineSeparator()).append(irException.getExceptionInfo());
650             } else if (e instanceof TestVMException testVMException) {
651                 builder.append(errorMsg).append(System.lineSeparator()).append(testVMException.getExceptionInfo());
652             } else {
653                 // Print stack trace otherwise
654                 StringWriter errors = new StringWriter();
655                 e.printStackTrace(new PrintWriter(errors));
656                 builder.append(errors);
657             }
658             builder.append(System.lineSeparator());
659         }
660         System.err.println(builder);
661         if (!VERBOSE && !REPORT_STDOUT && !TESTLIST && !EXCLUDELIST) {
662             // Provide a hint to the user how to get additional output/debugging information.
663             System.err.println(RERUN_HINT);
664         }
665         throw new TestRunException(failedScenarios + ". Please check stderr for more information.");
666     }
667 
668     private static String getScenarioTitleAndFlags(Scenario scenario) {
669         StringBuilder builder = new StringBuilder();
670         String title = "Scenario #" + scenario.getIndex();
671         builder.append(title).append(System.lineSeparator()).append("=".repeat(title.length()))
672                .append(System.lineSeparator());
673         builder.append("Scenario flags: [").append(String.join(", ", scenario.getFlags())).append("]")
674                .append(System.lineSeparator());
675         return builder.toString();
676     }
677 
678     /**
679      * Execute a separate "flag" VM with White Box access to determine all test VM flags. The flag VM sends an encoding of
680      * all required flags for the test VM to the driver VM over a socket. Once the flag VM exits, this driver VM parses the
681      * test VM flags, which also determine if IR matching should be done, and then starts the test VM to execute all tests.
682      */
683     private void start(Scenario scenario) {
684         if (scenario != null && !scenario.isEnabled()) {
685             System.out.println("Disabled scenario #" + scenario.getIndex() + "! This scenario is not present in set flag " +
686                                "-DScenarios and is therefore not executed.");
687             return;
688         }
689         shouldVerifyIR = irVerificationPossible;
690         try {
691             // Use TestFramework flags and scenario flags for new VMs.
692             List<String> additionalFlags = new ArrayList<>();
693             if (flags != null) {
694                 additionalFlags.addAll(flags);
695             }
696             if (scenario != null) {
697                 List<String> scenarioFlags = scenario.getFlags();
698                 String scenarioFlagsString = scenarioFlags.isEmpty() ? "" : " - [" + String.join(", ", scenarioFlags) + "]";
699                 System.out.println("Scenario #" + scenario.getIndex() + scenarioFlagsString + ":");
700                 additionalFlags.addAll(scenarioFlags);
701             }
702             String frameworkAndScenarioFlags = additionalFlags.isEmpty() ?
703                     "" : " - [" + String.join(", ", additionalFlags) + "]";
704 
705             if (shouldVerifyIR) {
706                 // Only need to use flag VM if an IR verification is possibly done.
707                 System.out.println("Run Flag VM:");
708                 FlagVMProcess flagVMProcess = new FlagVMProcess(testClass, additionalFlags);
709                 shouldVerifyIR = flagVMProcess.shouldVerifyIR();
710                 if (shouldVerifyIR) {
711                     // Add more flags for the test VM which are required to do IR verification.
712                     additionalFlags.addAll(flagVMProcess.getTestVMFlags());
713                 } // else: Flag VM found a reason to not do IR verification.
714             } else {
715                 System.out.println("Skip Flag VM due to not performing IR verification.");
716             }
717 
718             System.out.println("Run Test VM" + frameworkAndScenarioFlags + ":");
719             runTestVM(additionalFlags);
720         } finally {
721             if (scenario != null) {
722                 scenario.setTestVMOutput(TestVMProcess.getLastTestVMOutput());
723             }
724             System.out.println();
725         }
726     }
727 
728     private boolean hasIRAnnotations() {
729         return Arrays.stream(testClass.getDeclaredMethods()).anyMatch(m -> m.getAnnotationsByType(IR.class).length > 0);
730     }
731 
732     private boolean onlyWhitelistedJTregVMAndJavaOptsFlags() {
733         List<String> flags = Arrays.stream(Utils.getTestJavaOpts())
734                                    .map(s -> s.replaceFirst("-XX:[+|-]?|-(?=[^D|^e])", ""))
735                                    .collect(Collectors.toList());
736         for (String flag : flags) {
737             // Property flags (prefix -D), -ea and -esa are whitelisted.
738             if (!flag.startsWith("-D") && !flag.startsWith("-e") && JTREG_WHITELIST_FLAGS.stream().noneMatch(flag::contains)) {
739                 // Found VM flag that is not whitelisted
740                 return false;
741             }
742         }
743         return true;
744     }
745 
746     private void runTestVM(List<String> additionalFlags) {
747         TestVMProcess testVMProcess = new TestVMProcess(additionalFlags, testClass, helperClasses, defaultWarmup);
748         if (shouldVerifyIR) {
749             try {
750                 MethodCompilationParser methodCompilationParser = new MethodCompilationParser(testClass);
751                 Matchable testClassMatchable = methodCompilationParser.parse(testVMProcess.getHotspotPidFileName(),
752                                                                              testVMProcess.getIrEncoding());
753                 IRMatcher matcher = new IRMatcher(testClassMatchable);
754                 matcher.match();
755             } catch (IRViolationException e) {
756                 e.addCommandLine(testVMProcess.getCommandLine());
757                 throw e;
758             }
759         } else {
760             System.out.println("IR verification disabled either due to no @IR annotations, through explicitly setting " +
761                                "-DVerify=false, due to not running a debug build, using a non-whitelisted JTreg VM or " +
762                                "Javaopts flag like -Xint, or running the test VM with other VM flags added by user code " +
763                                "that make the IR verification impossible (e.g. -XX:-UseCompile, " +
764                                "-XX:TieredStopAtLevel=[1,2,3], etc.).");
765         }
766     }
767 
768     public static void check(boolean test, String failureMessage) {
769         if (!test) {
770             throw new TestFrameworkException(failureMessage);
771         }
772     }
773 }
--- EOF ---