1 /*
2 * Copyright (c) 2016, 2025, 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 requires;
25
26 import java.io.BufferedInputStream;
27 import java.io.FileInputStream;
28 import java.io.IOException;
29 import java.io.InputStream;
30 import java.io.File;
31 import java.nio.charset.Charset;
32 import java.nio.file.Files;
33 import java.nio.file.Path;
34 import java.nio.file.Paths;
35 import java.nio.file.StandardOpenOption;
36 import java.time.Instant;
37 import java.util.ArrayList;
38 import java.util.Collections;
39 import java.util.HashMap;
40 import java.util.List;
41 import java.util.Map;
42 import java.util.Properties;
43 import java.util.Set;
44 import java.util.concurrent.Callable;
45 import java.util.concurrent.TimeUnit;
46 import java.util.function.Predicate;
47 import java.util.function.Supplier;
48 import java.util.regex.Matcher;
49 import java.util.regex.Pattern;
50 import java.util.stream.Stream;
51
52 import jdk.internal.foreign.CABI;
53 import jdk.internal.misc.PreviewFeatures;
54 import jdk.test.whitebox.code.Compiler;
55 import jdk.test.whitebox.cpuinfo.CPUInfo;
56 import jdk.test.whitebox.gc.GC;
57 import jdk.test.whitebox.WhiteBox;
58 import jdk.test.lib.Platform;
59 import jdk.test.lib.Container;
60
61 /**
62 * The Class to be invoked by jtreg prior Test Suite execution to
63 * collect information about VM.
64 * Do not use any APIs that may not be available in all target VMs.
65 * Properties set by this Class will be available in the @requires expressions.
66 */
67 public class VMProps implements Callable<Map<String, String>> {
68 // value known to jtreg as an indicator of error state
69 private static final String ERROR_STATE = "__ERROR__";
70
71 private static final String GC_PREFIX = "-XX:+Use";
72 private static final String GC_SUFFIX = "GC";
73
74 private static final WhiteBox WB = WhiteBox.getWhiteBox();
75
76 private static class SafeMap {
77 private final Map<String, String> map = new HashMap<>();
78
79 public void put(String key, Supplier<String> s) {
80 String value;
81 try {
82 value = s.get();
83 } catch (Throwable t) {
84 System.err.println("failed to get value for " + key);
85 t.printStackTrace(System.err);
86 value = ERROR_STATE + t;
87 }
88 map.put(key, value);
89 }
90 }
91
92 /**
93 * Collects information about VM properties.
94 * This method will be invoked by jtreg.
95 *
96 * @return Map of property-value pairs.
97 */
98 @Override
99 public Map<String, String> call() {
100 log("Entering call()");
101 SafeMap map = new SafeMap();
102 map.put("vm.flavor", this::vmFlavor);
103 map.put("vm.compMode", this::vmCompMode);
104 map.put("vm.bits", this::vmBits);
105 map.put("vm.flightRecorder", this::vmFlightRecorder);
106 map.put("vm.simpleArch", this::vmArch);
107 map.put("vm.debug", this::vmDebug);
108 map.put("vm.jvmci", this::vmJvmci);
109 map.put("vm.jvmci.enabled", this::vmJvmciEnabled);
110 map.put("vm.emulatedClient", this::vmEmulatedClient);
111 // vm.hasSA is "true" if the VM contains the serviceability agent
112 // and jhsdb.
113 map.put("vm.hasSA", this::vmHasSA);
114 // vm.hasJFR is "true" if JFR is included in the build of the VM and
115 // so tests can be executed.
116 map.put("vm.hasJFR", this::vmHasJFR);
117 map.put("vm.hasDTrace", this::vmHasDTrace);
118 map.put("vm.jvmti", this::vmHasJVMTI);
119 map.put("vm.cpu.features", this::cpuFeatures);
120 map.put("vm.pageSize", this::vmPageSize);
121 // vm.cds is true if the VM is compiled with cds support.
122 map.put("vm.cds", this::vmCDS);
123 map.put("vm.cds.default.archive.available", this::vmCDSDefaultArchiveAvailable);
124 map.put("vm.cds.custom.loaders", this::vmCDSForCustomLoaders);
125 map.put("vm.cds.supports.aot.class.linking", this::vmCDSSupportsAOTClassLinking);
126 map.put("vm.cds.supports.aot.code.caching", this::vmCDSSupportsAOTCodeCaching);
127 map.put("vm.cds.write.archived.java.heap", this::vmCDSCanWriteArchivedJavaHeap);
128 map.put("vm.continuations", this::vmContinuations);
129 // vm.graal.enabled is true if Graal is used as JIT
130 map.put("vm.graal.enabled", this::isGraalEnabled);
131 // jdk.hasLibgraal is true if the libgraal shared library file is present
132 map.put("jdk.hasLibgraal", this::hasLibgraal);
133 map.put("java.enablePreview", this::isPreviewEnabled);
134 map.put("vm.libgraal.jit", this::isLibgraalJIT);
135 map.put("vm.compiler1.enabled", this::isCompiler1Enabled);
136 map.put("vm.compiler2.enabled", this::isCompiler2Enabled);
137 map.put("container.support", this::containerSupport);
138 map.put("systemd.support", this::systemdSupport);
139 map.put("vm.musl", this::isMusl);
140 map.put("vm.asan", this::isAsanEnabled);
141 map.put("vm.ubsan", this::isUbsanEnabled);
142 map.put("release.implementor", this::implementor);
143 map.put("jdk.containerized", this::jdkContainerized);
144 map.put("vm.flagless", this::isFlagless);
145 map.put("jdk.foreign.linker", this::jdkForeignLinker);
146 map.put("jlink.packagedModules", this::packagedModules);
147 map.put("jdk.static", this::isStatic);
148 vmGC(map); // vm.gc.X = true/false
149 vmGCforCDS(map); // may set vm.gc
150 vmOptFinalFlags(map);
151
152 dump(map.map);
153 log("Leaving call()");
154 return map.map;
155 }
156
157 /**
158 * Print a stack trace before returning error state;
159 * Used by the various helper functions which parse information from
160 * VM properties in the case where they don't find an expected property
161 * or a property doesn't conform to an expected format.
162 *
163 * @return {@link #ERROR_STATE}
164 */
165 private String errorWithMessage(String message) {
166 new Exception(message).printStackTrace();
167 return ERROR_STATE + message;
168 }
169
170 /**
171 * @return vm.simpleArch value of "os.simpleArch" property of tested JDK.
172 */
173 protected String vmArch() {
174 String arch = System.getProperty("os.arch");
175 if (arch.equals("x86_64") || arch.equals("amd64")) {
176 return "x64";
177 } else if (arch.contains("86")) {
178 return "x86";
179 } else {
180 return arch;
181 }
182 }
183
184 /**
185 * @return VM type value extracted from the "java.vm.name" property.
186 */
187 protected String vmFlavor() {
188 // E.g. "Java HotSpot(TM) 64-Bit Server VM"
189 String vmName = System.getProperty("java.vm.name");
190 if (vmName == null) {
191 return errorWithMessage("Can't get 'java.vm.name' property");
192 }
193
194 Pattern startP = Pattern.compile(".* (\\S+) VM");
195 Matcher m = startP.matcher(vmName);
196 if (m.matches()) {
197 return m.group(1).toLowerCase();
198 }
199 return errorWithMessage("Can't get VM flavor from 'java.vm.name'");
200 }
201
202 /**
203 * @return VM compilation mode extracted from the "java.vm.info" property.
204 */
205 protected String vmCompMode() {
206 // E.g. "mixed mode"
207 String vmInfo = System.getProperty("java.vm.info");
208 if (vmInfo == null) {
209 return errorWithMessage("Can't get 'java.vm.info' property");
210 }
211 vmInfo = vmInfo.toLowerCase();
212 if (vmInfo.contains("mixed mode")) {
213 return "Xmixed";
214 } else if (vmInfo.contains("compiled mode")) {
215 return "Xcomp";
216 } else if (vmInfo.contains("interpreted mode")) {
217 return "Xint";
218 } else {
219 return errorWithMessage("Can't get compilation mode from 'java.vm.info'");
220 }
221 }
222
223 /**
224 * @return VM bitness, the value of the "sun.arch.data.model" property.
225 */
226 protected String vmBits() {
227 String dataModel = System.getProperty("sun.arch.data.model");
228 if (dataModel != null) {
229 return dataModel;
230 } else {
231 return errorWithMessage("Can't get 'sun.arch.data.model' property");
232 }
233 }
234
235 /**
236 * @return "true" if Flight Recorder is enabled, "false" if is disabled.
237 */
238 protected String vmFlightRecorder() {
239 Boolean isFlightRecorder = WB.getBooleanVMFlag("FlightRecorder");
240 String startFROptions = WB.getStringVMFlag("StartFlightRecording");
241 if (isFlightRecorder != null && isFlightRecorder) {
242 return "true";
243 }
244 if (startFROptions != null && !startFROptions.isEmpty()) {
245 return "true";
246 }
247 return "false";
248 }
249
250 /**
251 * @return debug level value extracted from the "jdk.debug" property.
252 */
253 protected String vmDebug() {
254 String debug = System.getProperty("jdk.debug");
255 if (debug != null) {
256 return "" + debug.contains("debug");
257 } else {
258 return errorWithMessage("Can't get 'jdk.debug' property");
259 }
260 }
261
262 /**
263 * @return true if VM supports JVMCI and false otherwise
264 */
265 protected String vmJvmci() {
266 // builds with jvmci have this flag
267 if (WB.getBooleanVMFlag("EnableJVMCI") == null) {
268 return "false";
269 }
270
271 // Not all GCs have full JVMCI support
272 if (!WB.isJVMCISupportedByGC()) {
273 return "false";
274 }
275
276 // Interpreted mode cannot enable JVMCI
277 if (vmCompMode().equals("Xint")) {
278 return "false";
279 }
280
281 return "true";
282 }
283
284
285 /**
286 * @return true if JVMCI is enabled
287 */
288 protected String vmJvmciEnabled() {
289 // builds with jvmci have this flag
290 if ("false".equals(vmJvmci())) {
291 return "false";
292 }
293
294 return "" + Compiler.isJVMCIEnabled();
295 }
296
297
298 /**
299 * @return true if VM runs in emulated-client mode and false otherwise.
300 */
301 protected String vmEmulatedClient() {
302 String vmInfo = System.getProperty("java.vm.info");
303 if (vmInfo == null) {
304 return errorWithMessage("Can't get 'java.vm.info' property");
305 }
306 return "" + vmInfo.contains(" emulated-client");
307 }
308
309 /**
310 * @return supported CPU features
311 */
312 protected String cpuFeatures() {
313 return CPUInfo.getFeatures().toString();
314 }
315
316 /**
317 * For all existing GC sets vm.gc.X property.
318 * Example vm.gc.G1=true means:
319 * VM supports G1
320 * User either set G1 explicitely (-XX:+UseG1GC) or did not set any GC
321 * G1 can be selected, i.e. it doesn't conflict with other VM flags
322 *
323 * @param map - property-value pairs
324 */
325 protected void vmGC(SafeMap map) {
326 var isJVMCIEnabled = Compiler.isJVMCIEnabled();
327 Predicate<GC> vmGCProperty = (GC gc) -> (gc.isSupported()
328 && (!isJVMCIEnabled || gc.isSupportedByJVMCICompiler())
329 && (gc.isSelected() || GC.isSelectedErgonomically()));
330 for (GC gc: GC.values()) {
331 map.put("vm.gc." + gc.name(), () -> "" + vmGCProperty.test(gc));
332 }
333 }
334
335 /**
336 * "jtreg -vmoptions:-Dtest.cds.runtime.options=..." can be used to specify
337 * the GC type to be used when running with a CDS archive. Set "vm.gc" accordingly,
338 * so that tests that need to explicitly choose the GC type can be excluded
339 * with "@requires vm.gc == null".
340 *
341 * @param map - property-value pairs
342 */
343 protected void vmGCforCDS(SafeMap map) {
344 if (!GC.isSelectedErgonomically()) {
345 // The GC has been explicitly specified on the command line, so
346 // jtreg will set the "vm.gc" property. Let's not interfere with it.
347 return;
348 }
349
350 String jtropts = System.getProperty("test.cds.runtime.options");
351 if (jtropts != null) {
352 for (String opt : jtropts.split(",")) {
353 if (opt.startsWith(GC_PREFIX) && opt.endsWith(GC_SUFFIX)) {
354 String gc = opt.substring(GC_PREFIX.length(), opt.length() - GC_SUFFIX.length());
355 map.put("vm.gc", () -> gc);
356 }
357 }
358 }
359 }
360
361 /**
362 * Selected final flag.
363 *
364 * @param map - property-value pairs
365 * @param flagName - flag name
366 */
367 private void vmOptFinalFlag(SafeMap map, String flagName) {
368 map.put("vm.opt.final." + flagName,
369 () -> String.valueOf(WB.getBooleanVMFlag(flagName)));
370 }
371
372 /**
373 * Selected sets of final flags.
374 *
375 * @param map - property-value pairs
376 */
377 protected void vmOptFinalFlags(SafeMap map) {
378 vmOptFinalFlag(map, "ClassUnloading");
379 vmOptFinalFlag(map, "ClassUnloadingWithConcurrentMark");
380 vmOptFinalFlag(map, "CriticalJNINatives");
381 vmOptFinalFlag(map, "EnableJVMCI");
382 vmOptFinalFlag(map, "EliminateAllocations");
383 vmOptFinalFlag(map, "TieredCompilation");
384 vmOptFinalFlag(map, "UnlockExperimentalVMOptions");
385 vmOptFinalFlag(map, "UseCompressedOops");
386 vmOptFinalFlag(map, "UseLargePages");
387 vmOptFinalFlag(map, "UseTransparentHugePages");
388 vmOptFinalFlag(map, "UseVectorizedMismatchIntrinsic");
389 }
390
391 /**
392 * @return "true" if VM has a serviceability agent.
393 */
394 protected String vmHasSA() {
395 return "" + Platform.hasSA();
396 }
397
398 /**
399 * @return "true" if the VM is compiled with Java Flight Recorder (JFR)
400 * support.
401 */
402 protected String vmHasJFR() {
403 return "" + WB.isJFRIncluded();
404 }
405
406 /**
407 * @return "true" if the VM is compiled with JVMTI
408 */
409 protected String vmHasJVMTI() {
410 return "" + WB.isJVMTIIncluded();
411 }
412
413 /**
414 * @return "true" if the VM is compiled with DTrace
415 */
416 protected String vmHasDTrace() {
417 return "" + WB.isDTraceIncluded();
418 }
419
420 /**
421 * Check for CDS support.
422 *
423 * @return true if CDS is supported by the VM to be tested.
424 */
425 protected String vmCDS() {
426 boolean noJvmtiAdded = allFlags()
427 .filter(s -> s.startsWith("-agentpath"))
428 .findAny()
429 .isEmpty();
430
431 return "" + (noJvmtiAdded && WB.isCDSIncluded());
432 }
433
434 /**
435 * Check for CDS default archive existence.
436 *
437 * @return true if CDS default archive classes.jsa exists in the JDK to be tested.
438 */
439 protected String vmCDSDefaultArchiveAvailable() {
440 Path archive = Paths.get(System.getProperty("java.home"), "lib", "server", "classes.jsa");
441 return "" + ("true".equals(vmCDS()) && Files.exists(archive));
442 }
443
444 /**
445 * Check for CDS support for custom loaders.
446 *
447 * @return true if CDS provides support for customer loader in the VM to be tested.
448 */
449 protected String vmCDSForCustomLoaders() {
450 return "" + ("true".equals(vmCDS()) && Platform.areCustomLoadersSupportedForCDS());
451 }
452
453 /**
454 * @return true if it's possible for "java -Xshare:dump" to write Java heap objects
455 * with the current set of jtreg VM options. For example, false will be returned
456 * if -XX:-UseCompressedClassPointers is specified,
457 */
458 protected String vmCDSCanWriteArchivedJavaHeap() {
459 return "" + ("true".equals(vmCDS()) && WB.canWriteJavaHeapArchive()
460 && isCDSRuntimeOptionsCompatible());
461 }
462
463 /**
464 * @return true if this VM can support the -XX:AOTClassLinking option
465 */
466 protected String vmCDSSupportsAOTClassLinking() {
467 // Currently, the VM supports AOTClassLinking as long as it's able to write archived java heap.
468 return vmCDSCanWriteArchivedJavaHeap();
469 }
470
471 /**
472 * @return true if this VM can support the AOT Code Caching
473 */
474 protected String vmCDSSupportsAOTCodeCaching() {
475 if ("true".equals(vmCDSSupportsAOTClassLinking()) &&
476 !"zero".equals(vmFlavor()) &&
477 "false".equals(vmJvmciEnabled()) &&
478 (Platform.isX64() || Platform.isAArch64())) {
479 return "true";
480 } else {
481 return "false";
482 }
483 }
484
485 /**
486 * @return true if the VM options specified via the "test.cds.runtime.options"
487 * property is compatible with writing Java heap objects into the CDS archive
488 */
489 protected boolean isCDSRuntimeOptionsCompatible() {
490 String jtropts = System.getProperty("test.cds.runtime.options");
491 if (jtropts == null) {
492 return true;
493 }
494 String CCP_DISABLED = "-XX:-UseCompressedClassPointers";
495 String G1GC_ENABLED = "-XX:+UseG1GC";
496 String PARALLELGC_ENABLED = "-XX:+UseParallelGC";
497 String SERIALGC_ENABLED = "-XX:+UseSerialGC";
498 for (String opt : jtropts.split(",")) {
499 if (opt.equals(CCP_DISABLED)) {
500 return false;
501 }
502 if (opt.startsWith(GC_PREFIX) && opt.endsWith(GC_SUFFIX) &&
503 !opt.equals(G1GC_ENABLED) && !opt.equals(PARALLELGC_ENABLED) && !opt.equals(SERIALGC_ENABLED)) {
504 return false;
505 }
506 }
507 return true;
508 }
509
510 /**
511 * @return "true" if this VM supports continuations.
512 */
513 protected String vmContinuations() {
514 if (WB.getBooleanVMFlag("VMContinuations")) {
515 return "true";
516 } else {
517 return "false";
518 }
519 }
520
521 /**
522 * @return System page size in bytes.
523 */
524 protected String vmPageSize() {
525 return "" + WB.getVMPageSize();
526 }
527
528 /**
529 * Check if Graal is used as JIT compiler.
530 *
531 * @return true if Graal is used as JIT compiler.
532 */
533 protected String isGraalEnabled() {
534 return "" + Compiler.isGraalEnabled();
535 }
536
537 /**
538 * Check if the libgraal shared library file is present.
539 *
540 * @return true if the libgraal shared library file is present.
541 */
542 protected String hasLibgraal() {
543 return "" + WB.hasLibgraal();
544 }
545
546 /**
547 * Check if libgraal is used as JIT compiler.
548 *
549 * @return true if libgraal is used as JIT compiler.
550 */
551 protected String isLibgraalJIT() {
552 return "" + Compiler.isLibgraalJIT();
553 }
554
555 /**
556 * Check if Compiler1 is present.
557 *
558 * @return true if Compiler1 is used as JIT compiler, either alone or as part of the tiered system.
559 */
560 protected String isCompiler1Enabled() {
561 return "" + Compiler.isC1Enabled();
562 }
563
564 /**
565 * Check if Compiler2 is present.
566 *
567 * @return true if Compiler2 is used as JIT compiler, either alone or as part of the tiered system.
568 */
569 protected String isCompiler2Enabled() {
570 return "" + Compiler.isC2Enabled();
571 }
572
573 protected String isPreviewEnabled() {
574 return "" + PreviewFeatures.isEnabled();
575 }
576 /**
577 * A simple check for container support
578 *
579 * @return true if container is supported in a given environment
580 */
581 protected String containerSupport() {
582 log("Entering containerSupport()");
583
584 boolean isSupported = false;
585 if (Platform.isLinux()) {
586 // currently container testing is only supported for Linux,
587 // on certain platforms
588
589 String arch = System.getProperty("os.arch");
590
591 if (Platform.isX64()) {
592 isSupported = true;
593 } else if (Platform.isAArch64()) {
594 isSupported = true;
595 } else if (Platform.isS390x()) {
596 isSupported = true;
597 } else if (arch.equals("ppc64le")) {
598 isSupported = true;
599 }
600 }
601
602 log("containerSupport(): platform check: isSupported = " + isSupported);
603
604 if (isSupported) {
605 try {
606 isSupported = checkProgramSupport("checkContainerSupport()", Container.ENGINE_COMMAND);
607 } catch (Exception e) {
608 isSupported = false;
609 }
610 }
611
612 log("containerSupport(): returning isSupported = " + isSupported);
613 return "" + isSupported;
614 }
615
616 /**
617 * A simple check for systemd support
618 *
619 * @return true if systemd is supported in a given environment
620 */
621 protected String systemdSupport() {
622 log("Entering systemdSupport()");
623
624 boolean isSupported = Platform.isLinux();
625 if (isSupported) {
626 try {
627 isSupported = checkProgramSupport("checkSystemdSupport()", "systemd-run");
628 } catch (Exception e) {
629 isSupported = false;
630 }
631 }
632
633 log("systemdSupport(): returning isSupported = " + isSupported);
634 return "" + isSupported;
635 }
636
637 // Configures process builder to redirect process stdout and stderr to a file.
638 // Returns file names for stdout and stderr.
639 private Map<String, String> redirectOutputToLogFile(String msg, ProcessBuilder pb, String fileNameBase) {
640 Map<String, String> result = new HashMap<>();
641 String timeStamp = Instant.now().toString().replace(":", "-").replace(".", "-");
642
643 String stdoutFileName = String.format("./%s-stdout--%s.log", fileNameBase, timeStamp);
644 pb.redirectOutput(new File(stdoutFileName));
645 log(msg + ": child process stdout redirected to " + stdoutFileName);
646 result.put("stdout", stdoutFileName);
647
648 String stderrFileName = String.format("./%s-stderr--%s.log", fileNameBase, timeStamp);
649 pb.redirectError(new File(stderrFileName));
650 log(msg + ": child process stderr redirected to " + stderrFileName);
651 result.put("stderr", stderrFileName);
652
653 return result;
654 }
655
656 private void printLogfileContent(Map<String, String> logFileNames) {
657 logFileNames.entrySet().stream()
658 .forEach(entry ->
659 {
660 log("------------- " + entry.getKey());
661 try {
662 Files.lines(Path.of(entry.getValue()))
663 .forEach(line -> log(line));
664 } catch (IOException ie) {
665 log("Exception while reading file: " + ie);
666 }
667 log("-------------");
668 });
669 }
670
671 private boolean checkProgramSupport(String logString, String cmd) throws IOException, InterruptedException {
672 log(logString + ": entering");
673 ProcessBuilder pb = new ProcessBuilder("which", cmd);
674 Map<String, String> logFileNames =
675 redirectOutputToLogFile(logString + ": which " + cmd,
676 pb, "which-cmd");
677 Process p = pb.start();
678 p.waitFor(10, TimeUnit.SECONDS);
679 int exitValue = p.exitValue();
680
681 log(String.format("%s: exitValue = %s, pid = %s", logString, exitValue, p.pid()));
682 if (exitValue != 0) {
683 printLogfileContent(logFileNames);
684 }
685
686 return (exitValue == 0);
687 }
688
689 /**
690 * Checks musl libc.
691 *
692 * @return true if musl libc is used.
693 */
694 protected String isMusl() {
695 return Boolean.toString(WB.getLibcName().contains("musl"));
696 }
697
698 // Sanitizer support
699 protected String isAsanEnabled() {
700 return "" + WB.isAsanEnabled();
701 }
702
703 protected String isUbsanEnabled() {
704 return "" + WB.isUbsanEnabled();
705 }
706
707 private String implementor() {
708 try (InputStream in = new BufferedInputStream(new FileInputStream(
709 System.getProperty("java.home") + "/release"))) {
710 Properties properties = new Properties();
711 properties.load(in);
712 String implementorProperty = properties.getProperty("IMPLEMENTOR");
713 if (implementorProperty != null) {
714 return implementorProperty.replace("\"", "");
715 }
716 return errorWithMessage("Can't get 'IMPLEMENTOR' property from 'release' file");
717 } catch (IOException e) {
718 e.printStackTrace();
719 return errorWithMessage("Failed to read 'release' file " + e);
720 }
721 }
722
723 private String jdkContainerized() {
724 String isEnabled = System.getenv("TEST_JDK_CONTAINERIZED");
725 return "" + "true".equalsIgnoreCase(isEnabled);
726 }
727
728 private String packagedModules() {
729 // Some jlink tests require packaged modules being present (jmods).
730 // For a runtime linkable image build packaged modules aren't present
731 try {
732 Path jmodsDir = Path.of(System.getProperty("java.home"), "jmods");
733 if (jmodsDir.toFile().exists()) {
734 return Boolean.TRUE.toString();
735 } else {
736 return Boolean.FALSE.toString();
737 }
738 } catch (Throwable t) {
739 return Boolean.FALSE.toString();
740 }
741 }
742
743 /**
744 * Checks if we are in <i>almost</i> out-of-box configuration, i.e. the flags
745 * which JVM is started with don't affect its behavior "significantly".
746 * {@code TEST_VM_FLAGLESS} enviroment variable can be used to force this
747 * method to return true or false and allow or reject any flags.
748 *
749 * @return true if there are no JVM flags
750 */
751 private String isFlagless() {
752 boolean result = true;
753 String flagless = System.getenv("TEST_VM_FLAGLESS");
754 if (flagless != null) {
755 return "" + "true".equalsIgnoreCase(flagless);
756 }
757
758 List<String> allFlags = allFlags().toList();
759
760 // check -XX flags
761 var ignoredXXFlags = Set.of(
762 // added by run-test framework
763 "MaxRAMPercentage",
764 // added by test environment
765 "CreateCoredumpOnCrash"
766 );
767 result &= allFlags.stream()
768 .filter(s -> s.startsWith("-XX:"))
769 // map to names:
770 // remove -XX:
771 .map(s -> s.substring(4))
772 // remove +/- from bool flags
773 .map(s -> s.charAt(0) == '+' || s.charAt(0) == '-' ? s.substring(1) : s)
774 // remove =.* from others
775 .map(s -> s.contains("=") ? s.substring(0, s.indexOf('=')) : s)
776 // skip known-to-be-there flags
777 .filter(s -> !ignoredXXFlags.contains(s))
778 .findAny()
779 .isEmpty();
780
781 // check -X flags
782 var ignoredXFlags = Set.of(
783 // default, yet still seen to be explicitly set
784 "mixed",
785 // -XmxmNNNm added by run-test framework for non-hotspot tests
786 "mx"
787 );
788 result &= allFlags.stream()
789 .filter(s -> s.startsWith("-X") && !s.startsWith("-XX:"))
790 // map to names:
791 // remove -X
792 .map(s -> s.substring(2))
793 // remove :.* from flags with values
794 .map(s -> s.contains(":") ? s.substring(0, s.indexOf(':')) : s)
795 // remove size like 4G, 768m which might be set for non-hotspot tests
796 .map(s -> s.replaceAll("(\\d+)[mMgGkK]", ""))
797 // skip known-to-be-there flags
798 .filter(s -> !ignoredXFlags.contains(s))
799 .findAny()
800 .isEmpty();
801
802 return "" + result;
803 }
804
805 private Stream<String> allFlags() {
806 return Stream.of((System.getProperty("test.vm.opts", "") + " " + System.getProperty("test.java.opts", "")).trim().split("\\s+"));
807 }
808
809 /*
810 * A string indicating the foreign linker that is currently being used. See jdk.internal.foreign.CABI
811 * for valid values.
812 *
813 * "FALLBACK" and "UNSUPPORTED" are special values. The former indicates the fallback linker is
814 * being used. The latter indicates an unsupported platform.
815 */
816 private String jdkForeignLinker() {
817 return String.valueOf(CABI.current());
818 }
819
820 private String isStatic() {
821 return Boolean.toString(WB.isStatic());
822 }
823
824 /**
825 * Dumps the map to the file if the file name is given as the property.
826 * This functionality could be helpful to know context in the real
827 * execution.
828 *
829 * @param map
830 */
831 protected static void dump(Map<String, String> map) {
832 String dumpFileName = System.getProperty("vmprops.dump");
833 if (dumpFileName == null) {
834 return;
835 }
836 List<String> lines = new ArrayList<>();
837 map.forEach((k, v) -> lines.add(k + ":" + v));
838 Collections.sort(lines);
839 try {
840 Files.write(Paths.get(dumpFileName), lines,
841 StandardOpenOption.APPEND, StandardOpenOption.CREATE);
842 } catch (IOException e) {
843 throw new RuntimeException("Failed to dump properties into '"
844 + dumpFileName + "'", e);
845 }
846 }
847
848 /**
849 * Log diagnostic message.
850 *
851 * @param msg
852 */
853 protected static void log(String msg) {
854 // Always log to a file.
855 logToFile(msg);
856
857 // Also log to stderr; guarded by property to avoid excessive verbosity.
858 // By jtreg design stderr produced here will be visible
859 // in the output of a parent process. Note: stdout should not be used
860 // for logging as jtreg parses that output directly and only echoes it
861 // in the event of a failure.
862 if (Boolean.getBoolean("jtreg.log.vmprops")) {
863 System.err.println("VMProps: " + msg);
864 }
865 }
866
867 /**
868 * Log diagnostic message to a file.
869 *
870 * @param msg
871 */
872 protected static void logToFile(String msg) {
873 String fileName = "./vmprops.log";
874 try {
875 Files.writeString(Paths.get(fileName), msg + "\n", Charset.forName("ISO-8859-1"),
876 StandardOpenOption.APPEND, StandardOpenOption.CREATE);
877 } catch (IOException e) {
878 throw new RuntimeException("Failed to log into '" + fileName + "'", e);
879 }
880 }
881
882 /**
883 * This method is for the testing purpose only.
884 *
885 * @param args
886 */
887 public static void main(String args[]) {
888 Map<String, String> map = new VMProps().call();
889 map.forEach((k, v) -> System.out.println(k + ": '" + v + "'"));
890 }
891 }