1 /*
2 * Copyright (c) 2011, 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
25 package org.graalvm.compiler.hotspot;
26
27 import static jdk.vm.ci.common.InitTimer.timer;
28 import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.runtime;
29 import static org.graalvm.compiler.core.common.GraalOptions.GeneratePIC;
30 import static org.graalvm.compiler.core.common.GraalOptions.HotSpotPrintInlining;
31
32 import java.io.PrintStream;
33 import java.util.ArrayList;
34 import java.util.EnumMap;
35 import java.util.List;
36 import java.util.Map;
37 import java.util.concurrent.atomic.AtomicReference;
38
39 import jdk.internal.vm.compiler.collections.EconomicMap;
40 import jdk.internal.vm.compiler.collections.EconomicSet;
41 import jdk.internal.vm.compiler.collections.Equivalence;
42 import jdk.internal.vm.compiler.collections.UnmodifiableMapCursor;
43 import org.graalvm.compiler.api.replacements.SnippetReflectionProvider;
44 import org.graalvm.compiler.api.runtime.GraalRuntime;
45 import org.graalvm.compiler.core.CompilationWrapper.ExceptionAction;
46 import org.graalvm.compiler.core.common.CompilationIdentifier;
47 import org.graalvm.compiler.core.common.GraalOptions;
48 import org.graalvm.compiler.core.common.spi.ForeignCallsProvider;
49 import org.graalvm.compiler.core.target.Backend;
50 import org.graalvm.compiler.debug.DebugContext;
51 import org.graalvm.compiler.debug.DebugContext.Description;
52 import org.graalvm.compiler.debug.DebugHandlersFactory;
53 import org.graalvm.compiler.debug.DebugOptions;
54 import org.graalvm.compiler.debug.DiagnosticsOutputDirectory;
55 import org.graalvm.compiler.debug.GlobalMetrics;
56 import org.graalvm.compiler.debug.GraalError;
57 import org.graalvm.compiler.debug.TTY;
58 import org.graalvm.compiler.hotspot.CompilationStatistics.Options;
59 import org.graalvm.compiler.hotspot.CompilerConfigurationFactory.BackendMap;
60 import org.graalvm.compiler.hotspot.debug.BenchmarkCounters;
61 import org.graalvm.compiler.hotspot.meta.HotSpotProviders;
62 import org.graalvm.compiler.nodes.spi.StampProvider;
63 import org.graalvm.compiler.options.EnumOptionKey;
64 import org.graalvm.compiler.options.OptionDescriptor;
65 import org.graalvm.compiler.options.OptionDescriptors;
66 import org.graalvm.compiler.options.OptionKey;
67 import org.graalvm.compiler.options.OptionValues;
68 import org.graalvm.compiler.options.OptionsParser;
69 import org.graalvm.compiler.phases.tiers.CompilerConfiguration;
70 import org.graalvm.compiler.replacements.SnippetCounter;
71 import org.graalvm.compiler.replacements.SnippetCounter.Group;
72 import org.graalvm.compiler.runtime.RuntimeProvider;
73 import org.graalvm.compiler.serviceprovider.GraalServices;
74
75 import jdk.vm.ci.code.Architecture;
76 import jdk.vm.ci.code.stack.StackIntrospection;
77 import jdk.vm.ci.common.InitTimer;
78 import jdk.vm.ci.hotspot.HotSpotCompilationRequest;
79 import jdk.vm.ci.hotspot.HotSpotJVMCIRuntime;
80 import jdk.vm.ci.hotspot.HotSpotResolvedJavaMethod;
81 import jdk.vm.ci.hotspot.HotSpotResolvedJavaType;
82 import jdk.vm.ci.hotspot.HotSpotResolvedObjectType;
83 import jdk.vm.ci.hotspot.HotSpotVMConfigStore;
84 import jdk.vm.ci.meta.JavaKind;
85 import jdk.vm.ci.meta.MetaAccessProvider;
86 import jdk.vm.ci.meta.ResolvedJavaMethod;
87 import jdk.vm.ci.meta.ResolvedJavaType;
88 import jdk.vm.ci.runtime.JVMCI;
89 import jdk.vm.ci.runtime.JVMCIBackend;
90
91 //JaCoCo Exclude
92
93 /**
94 * Singleton class holding the instance of the {@link GraalRuntime}.
95 */
96 public final class HotSpotGraalRuntime implements HotSpotGraalRuntimeProvider {
97
98 private static boolean checkArrayIndexScaleInvariants(MetaAccessProvider metaAccess) {
99 assert metaAccess.getArrayIndexScale(JavaKind.Byte) == 1;
100 assert metaAccess.getArrayIndexScale(JavaKind.Boolean) == 1;
101 assert metaAccess.getArrayIndexScale(JavaKind.Char) == 2;
102 assert metaAccess.getArrayIndexScale(JavaKind.Short) == 2;
103 assert metaAccess.getArrayIndexScale(JavaKind.Int) == 4;
104 assert metaAccess.getArrayIndexScale(JavaKind.Long) == 8;
105 assert metaAccess.getArrayIndexScale(JavaKind.Float) == 4;
106 assert metaAccess.getArrayIndexScale(JavaKind.Double) == 8;
107 return true;
108 }
109
110 private final String runtimeName;
111 private final String compilerConfigurationName;
112 private final HotSpotBackend hostBackend;
113 private final GlobalMetrics metricValues = new GlobalMetrics();
114 private final List<SnippetCounter.Group> snippetCounterGroups;
115 private final HotSpotGC garbageCollector;
116
117 private final EconomicMap<Class<? extends Architecture>, HotSpotBackend> backends = EconomicMap.create(Equivalence.IDENTITY);
118
119 private final GraalHotSpotVMConfig config;
120
121 /**
122 * The options can be {@linkplain #setOptionValues(String[], String[]) updated} by external
123 * interfaces such as JMX. This comes with the risk that inconsistencies can arise as an
124 * {@link OptionValues} object can be cached by various parts of Graal instead of always
125 * obtaining them from this object. However, concurrent updates are never lost.
126 */
127 private AtomicReference<OptionValues> optionsRef = new AtomicReference<>();
128
129 private final HotSpotGraalCompiler compiler;
130
131 private final DiagnosticsOutputDirectory outputDirectory;
132 private final Map<ExceptionAction, Integer> compilationProblemsPerAction;
133
134 /**
135 * @param nameQualifier a qualifier to be added to this runtime's {@linkplain #getName() name}
136 * @param compilerConfigurationFactory factory for the compiler configuration
137 * {@link CompilerConfigurationFactory#selectFactory(String, OptionValues)}
138 */
139 @SuppressWarnings("try")
140 HotSpotGraalRuntime(String nameQualifier, HotSpotJVMCIRuntime jvmciRuntime, CompilerConfigurationFactory compilerConfigurationFactory, OptionValues initialOptions) {
141 this.runtimeName = getClass().getSimpleName() + ":" + nameQualifier;
142 HotSpotVMConfigStore store = jvmciRuntime.getConfigStore();
143 config = GeneratePIC.getValue(initialOptions) ? new AOTGraalHotSpotVMConfig(store) : new GraalHotSpotVMConfig(store);
144
145 // Only set HotSpotPrintInlining if it still has its default value (false).
146 if (GraalOptions.HotSpotPrintInlining.getValue(initialOptions) == false && config.printInlining) {
147 optionsRef.set(new OptionValues(initialOptions, HotSpotPrintInlining, true));
148 } else {
149 optionsRef.set(initialOptions);
150 }
151 OptionValues options = optionsRef.get();
152
153 garbageCollector = getSelectedGC();
154
155 outputDirectory = new DiagnosticsOutputDirectory(options);
156 compilationProblemsPerAction = new EnumMap<>(ExceptionAction.class);
157 snippetCounterGroups = GraalOptions.SnippetCounters.getValue(options) ? new ArrayList<>() : null;
158 CompilerConfiguration compilerConfiguration = compilerConfigurationFactory.createCompilerConfiguration();
159 compilerConfigurationName = compilerConfigurationFactory.getName();
160
161 compiler = new HotSpotGraalCompiler(jvmciRuntime, this, options);
162 management = GraalServices.loadSingle(HotSpotGraalManagementRegistration.class, false);
163 if (management != null) {
164 management.initialize(this);
165 }
166
167 BackendMap backendMap = compilerConfigurationFactory.createBackendMap();
168
169 JVMCIBackend hostJvmciBackend = jvmciRuntime.getHostJVMCIBackend();
170 Architecture hostArchitecture = hostJvmciBackend.getTarget().arch;
171 try (InitTimer t = timer("create backend:", hostArchitecture)) {
172 HotSpotBackendFactory factory = backendMap.getBackendFactory(hostArchitecture);
173 if (factory == null) {
174 throw new GraalError("No backend available for host architecture \"%s\"", hostArchitecture);
175 }
176 hostBackend = registerBackend(factory.createBackend(this, compilerConfiguration, jvmciRuntime, null));
177 }
178
179 for (JVMCIBackend jvmciBackend : jvmciRuntime.getJVMCIBackends().values()) {
180 if (jvmciBackend == hostJvmciBackend) {
181 continue;
182 }
183
184 Architecture gpuArchitecture = jvmciBackend.getTarget().arch;
185 HotSpotBackendFactory factory = backendMap.getBackendFactory(gpuArchitecture);
186 if (factory == null) {
187 throw new GraalError("No backend available for specified GPU architecture \"%s\"", gpuArchitecture);
188 }
189 try (InitTimer t = timer("create backend:", gpuArchitecture)) {
190 registerBackend(factory.createBackend(this, compilerConfiguration, null, hostBackend));
191 }
192 }
193
194 // Complete initialization of backends
195 try (InitTimer st = timer(hostBackend.getTarget().arch.getName(), ".completeInitialization")) {
196 hostBackend.completeInitialization(jvmciRuntime, options);
197 }
198 for (HotSpotBackend backend : backends.getValues()) {
199 if (backend != hostBackend) {
200 try (InitTimer st = timer(backend.getTarget().arch.getName(), ".completeInitialization")) {
201 backend.completeInitialization(jvmciRuntime, options);
202 }
203 }
204 }
205
206 BenchmarkCounters.initialize(jvmciRuntime, options);
207
208 assert checkArrayIndexScaleInvariants(hostJvmciBackend.getMetaAccess());
209
210 runtimeStartTime = System.nanoTime();
211 bootstrapJVMCI = config.getFlag("BootstrapJVMCI", Boolean.class);
212 }
213
214 /**
215 * Constants denoting the GC algorithms available in HotSpot.
216 */
217 public enum HotSpotGC {
218 // Supported GCs
219 Serial(true, "UseSerialGC"),
220 Parallel(true, "UseParallelGC", "UseParallelOldGC", "UseParNewGC"),
221 CMS(true, "UseConcMarkSweepGC"),
222 G1(true, "UseG1GC"),
223
224 // Unsupported GCs
225 Epsilon(false, "UseEpsilonGC"),
226 Z(false, "UseZGC");
227
228 HotSpotGC(boolean supported, String... flags) {
229 this.supported = supported;
230 this.flags = flags;
231 }
232
233 final boolean supported;
234 private final String[] flags;
235
236 public boolean isSelected(GraalHotSpotVMConfig config) {
237 for (String flag : flags) {
238 final boolean notPresent = false;
239 if (config.getFlag(flag, Boolean.class, notPresent)) {
240 return true;
241 }
242 }
243 return false;
244 }
245
246 }
247
248 private HotSpotGC getSelectedGC() throws GraalError {
249 for (HotSpotGC gc : HotSpotGC.values()) {
250 if (gc.isSelected(config)) {
251 if (!gc.supported) {
252 throw new GraalError(gc.name() + " garbage collector is not supported by Graal");
253 }
254 return gc;
255 }
256 }
257 // As of JDK 9, exactly one GC flag is guaranteed to be selected.
258 // On JDK 8, the default GC is Serial when no GC flag is true.
259 return HotSpotGC.Serial;
260 }
261
262 private HotSpotBackend registerBackend(HotSpotBackend backend) {
263 Class<? extends Architecture> arch = backend.getTarget().arch.getClass();
264 HotSpotBackend oldValue = backends.put(arch, backend);
265 assert oldValue == null : "cannot overwrite existing backend for architecture " + arch.getSimpleName();
266 return backend;
267 }
268
269 @Override
270 public HotSpotProviders getHostProviders() {
271 return getHostBackend().getProviders();
272 }
273
274 @Override
275 public GraalHotSpotVMConfig getVMConfig() {
276 return config;
277 }
278
279 @Override
280 public DebugContext openDebugContext(OptionValues compilationOptions, CompilationIdentifier compilationId, Object compilable, Iterable<DebugHandlersFactory> factories, PrintStream logStream) {
281 if (management != null && management.poll(false) != null) {
282 if (compilable instanceof HotSpotResolvedJavaMethod) {
283 HotSpotResolvedObjectType type = ((HotSpotResolvedJavaMethod) compilable).getDeclaringClass();
284 if (type instanceof HotSpotResolvedJavaType) {
285 Class<?> clazz = runtime().getMirror(type);
286 try {
287 ClassLoader cl = clazz.getClassLoader();
288 if (cl != null) {
289 loaders.add(cl);
290 }
291 } catch (SecurityException e) {
292 // This loader can obviously not be used for resolving class names
293 }
294 }
295 }
296 }
297 Description description = new Description(compilable, compilationId.toString(CompilationIdentifier.Verbosity.ID));
298 return DebugContext.create(compilationOptions, description, metricValues, logStream, factories);
299 }
300
301 @Override
302 public OptionValues getOptions() {
303 return optionsRef.get();
304 }
305
306 @Override
307 public Group createSnippetCounterGroup(String groupName) {
308 if (snippetCounterGroups != null) {
309 Group group = new Group(groupName);
310 snippetCounterGroups.add(group);
311 return group;
312 }
313 return null;
314 }
315
316 @Override
317 public String getName() {
318 return runtimeName;
319 }
320
321 @SuppressWarnings("unchecked")
322 @Override
323 public <T> T getCapability(Class<T> clazz) {
324 if (clazz == RuntimeProvider.class) {
325 return (T) this;
326 } else if (clazz == OptionValues.class) {
327 return (T) optionsRef.get();
328 } else if (clazz == StackIntrospection.class) {
329 return (T) this;
330 } else if (clazz == SnippetReflectionProvider.class) {
331 return (T) getHostProviders().getSnippetReflection();
332 } else if (clazz == GraalHotSpotVMConfig.class) {
333 return (T) getVMConfig();
334 } else if (clazz == StampProvider.class) {
335 return (T) getHostProviders().getStampProvider();
336 } else if (ForeignCallsProvider.class.isAssignableFrom(clazz)) {
337 return (T) getHostProviders().getForeignCalls();
338 }
339 return null;
340 }
341
342 public HotSpotGC getGarbageCollector() {
343 return garbageCollector;
344 }
345
346 @Override
347 public HotSpotBackend getHostBackend() {
348 return hostBackend;
349 }
350
351 @Override
352 public <T extends Architecture> Backend getBackend(Class<T> arch) {
353 assert arch != Architecture.class;
354 return backends.get(arch);
355 }
356
357 @Override
358 public String getCompilerConfigurationName() {
359 return compilerConfigurationName;
360 }
361
362 private long runtimeStartTime;
363 private boolean shutdown;
364
365 /**
366 * Take action related to entering a new execution phase.
367 *
368 * @param phase the execution phase being entered
369 */
370 void phaseTransition(String phase) {
371 if (Options.UseCompilationStatistics.getValue(optionsRef.get())) {
372 CompilationStatistics.clear(phase);
373 }
374 }
375
376 void shutdown() {
377 shutdown = true;
378 metricValues.print(optionsRef.get());
379
380 phaseTransition("final");
381
382 if (snippetCounterGroups != null) {
383 for (Group group : snippetCounterGroups) {
384 TTY.out().out().println(group);
385 }
386 }
387 BenchmarkCounters.shutdown(runtime(), optionsRef.get(), runtimeStartTime);
388
389 outputDirectory.close();
390 }
391
392 void clearMetrics() {
393 metricValues.clear();
394 }
395
396 private final boolean bootstrapJVMCI;
397 private boolean bootstrapFinished;
398
399 public void notifyBootstrapFinished() {
400 bootstrapFinished = true;
401 }
402
403 @Override
404 public boolean isBootstrapping() {
405 return bootstrapJVMCI && !bootstrapFinished;
406 }
407
408 @Override
409 public boolean isShutdown() {
410 return shutdown;
411 }
412
413 @Override
414 public DiagnosticsOutputDirectory getOutputDirectory() {
415 return outputDirectory;
416 }
417
418 @Override
419 public Map<ExceptionAction, Integer> getCompilationProblemsPerAction() {
420 return compilationProblemsPerAction;
421 }
422
423 // ------- Management interface ---------
424
425 private final HotSpotGraalManagementRegistration management;
426
427 /**
428 * @returns the management object for this runtime or {@code null}
429 */
430 public HotSpotGraalManagementRegistration getManagement() {
431 return management;
432 }
433
434 /**
435 * Set of weak references to {@link ClassLoader}s available for resolving class names present in
436 * management {@linkplain #invokeManagementAction(String, Object[]) action} arguments.
437 */
438 private final WeakClassLoaderSet loaders = new WeakClassLoaderSet(ClassLoader.getSystemClassLoader());
439
440 /**
441 * Sets or updates this object's {@linkplain #getOptions() options} from {@code names} and
442 * {@code values}.
443 *
444 * @param values the values to set. The empty string represents {@code null} which resets an
445 * option to its default value. For string type options, a non-empty value must be
446 * enclosed in double quotes.
447 * @return an array of Strings where the element at index i is {@code names[i]} if setting the
448 * denoted option succeeded, {@code null} if the option is unknown otherwise an error
449 * message describing the failure to set the option
450 */
451 public String[] setOptionValues(String[] names, String[] values) {
452 EconomicMap<String, OptionDescriptor> optionDescriptors = getOptionDescriptors();
453 EconomicMap<OptionKey<?>, Object> newValues = EconomicMap.create(names.length);
454 EconomicSet<OptionKey<?>> resetValues = EconomicSet.create(names.length);
455 String[] result = new String[names.length];
456 for (int i = 0; i < names.length; i++) {
457 String name = names[i];
458 OptionDescriptor option = optionDescriptors.get(name);
459 if (option != null) {
460 String svalue = values[i];
461 Class<?> optionValueType = option.getOptionValueType();
462 OptionKey<?> optionKey = option.getOptionKey();
463 if (svalue == null || svalue.isEmpty() && !(optionKey instanceof EnumOptionKey)) {
464 resetValues.add(optionKey);
465 result[i] = name;
466 } else {
467 String valueToParse;
468 if (optionValueType == String.class) {
469 if (svalue.length() < 2 || svalue.charAt(0) != '"' || svalue.charAt(svalue.length() - 1) != '"') {
470 result[i] = "Invalid value for String option '" + name + "': must be the empty string or be enclosed in double quotes: " + svalue;
471 continue;
472 } else {
473 valueToParse = svalue.substring(1, svalue.length() - 1);
474 }
475 } else {
476 valueToParse = svalue;
477 }
478 try {
479 OptionsParser.parseOption(name, valueToParse, newValues, OptionsParser.getOptionsLoader());
480 result[i] = name;
481 } catch (IllegalArgumentException e) {
482 result[i] = e.getMessage();
483 continue;
484 }
485 }
486 } else {
487 result[i] = null;
488 }
489 }
490
491 OptionValues currentOptions;
492 OptionValues newOptions;
493 do {
494 currentOptions = optionsRef.get();
495 UnmodifiableMapCursor<OptionKey<?>, Object> cursor = currentOptions.getMap().getEntries();
496 while (cursor.advance()) {
497 OptionKey<?> key = cursor.getKey();
498 if (!resetValues.contains(key) && !newValues.containsKey(key)) {
499 newValues.put(key, OptionValues.decodeNull(cursor.getValue()));
500 }
501 }
502 newOptions = new OptionValues(newValues);
503 } while (!optionsRef.compareAndSet(currentOptions, newOptions));
504
505 return result;
506 }
507
508 /**
509 * Gets the values for the options corresponding to {@code names} encoded as strings. The empty
510 * string represents {@code null}. For string type options, non-{@code null} values will be
511 * enclosed in double quotes.
512 *
513 * @param names a list of option names
514 * @return the values for each named option. If an element in {@code names} does not denote an
515 * existing option, the corresponding element in the returned array will be {@code null}
516 */
517 public String[] getOptionValues(String... names) {
518 String[] values = new String[names.length];
519 EconomicMap<String, OptionDescriptor> optionDescriptors = getOptionDescriptors();
520 for (int i = 0; i < names.length; i++) {
521 OptionDescriptor option = optionDescriptors.get(names[i]);
522 if (option != null) {
523 OptionKey<?> optionKey = option.getOptionKey();
524 Object value = optionKey.getValue(getOptions());
525 String svalue;
526 if (option.getOptionValueType() == String.class && value != null) {
527 svalue = "\"" + value + "\"";
528 } else if (value == null) {
529 svalue = "";
530 } else {
531 svalue = String.valueOf(value);
532 }
533 values[i] = svalue;
534 } else {
535 // null denotes the option does not exist
536 values[i] = null;
537 }
538 }
539 return values;
540 }
541
542 private static EconomicMap<String, OptionDescriptor> getOptionDescriptors() {
543 EconomicMap<String, OptionDescriptor> result = EconomicMap.create();
544 for (OptionDescriptors set : OptionsParser.getOptionsLoader()) {
545 for (OptionDescriptor option : set) {
546 result.put(option.getName(), option);
547 }
548 }
549 return result;
550 }
551
552 private void dumpMethod(String className, String methodName, String filter, String host, int port) throws Exception {
553 EconomicSet<ClassNotFoundException> failures = EconomicSet.create();
554 EconomicSet<Class<?>> found = loaders.resolve(className, failures);
555 if (found.isEmpty()) {
556 ClassNotFoundException cause = failures.isEmpty() ? new ClassNotFoundException(className) : failures.iterator().next();
557 throw new Exception("Cannot find class " + className + " to schedule recompilation", cause);
558 }
559 for (Class<?> clazz : found) {
560 ResolvedJavaType type = JVMCI.getRuntime().getHostJVMCIBackend().getMetaAccess().lookupJavaType(clazz);
561 for (ResolvedJavaMethod method : type.getDeclaredMethods()) {
562 if (methodName.equals(method.getName()) && method instanceof HotSpotResolvedJavaMethod) {
563 HotSpotResolvedJavaMethod hotSpotMethod = (HotSpotResolvedJavaMethod) method;
564 dumpMethod(hotSpotMethod, filter, host, port);
565 }
566 }
567 }
568 }
569
570 private void dumpMethod(HotSpotResolvedJavaMethod hotSpotMethod, String filter, String host, int port) throws Exception {
571 EconomicMap<OptionKey<?>, Object> extra = EconomicMap.create();
572 extra.put(DebugOptions.Dump, filter);
573 extra.put(DebugOptions.PrintGraphHost, host);
574 extra.put(DebugOptions.PrintBinaryGraphPort, port);
575 OptionValues compileOptions = new OptionValues(getOptions(), extra);
576 compiler.compileMethod(new HotSpotCompilationRequest(hotSpotMethod, -1, 0L), false, compileOptions);
577 }
578
579 public Object invokeManagementAction(String actionName, Object[] params) throws Exception {
580 if ("dumpMethod".equals(actionName)) {
581 if (params.length != 0 && params[0] instanceof HotSpotResolvedJavaMethod) {
582 HotSpotResolvedJavaMethod method = param(params, 0, "method", HotSpotResolvedJavaMethod.class, null);
583 String filter = param(params, 1, "filter", String.class, ":3");
584 String host = param(params, 2, "host", String.class, "localhost");
585 Number port = param(params, 3, "port", Number.class, 4445);
586 dumpMethod(method, filter, host, port.intValue());
587 } else {
588 String className = param(params, 0, "className", String.class, null);
589 String methodName = param(params, 1, "methodName", String.class, null);
590 String filter = param(params, 2, "filter", String.class, ":3");
591 String host = param(params, 3, "host", String.class, "localhost");
592 Number port = param(params, 4, "port", Number.class, 4445);
593 dumpMethod(className, methodName, filter, host, port.intValue());
594 }
595 }
596 return null;
597 }
598
599 private static <T> T param(Object[] arr, int index, String name, Class<T> type, T defaultValue) {
600 Object value = arr.length > index ? arr[index] : null;
601 if (value == null || (value instanceof String && ((String) value).isEmpty())) {
602 if (defaultValue == null) {
603 throw new IllegalArgumentException(name + " must be specified");
604 }
605 value = defaultValue;
606 }
607 if (type.isInstance(value)) {
608 return type.cast(value);
609 }
610 throw new IllegalArgumentException("Expecting " + type.getName() + " for " + name + " but was " + value);
611 }
612 }