1 /*
2 * Copyright (c) 2011, 2019, 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 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classLoaderHierarchyDCmd.hpp"
28 #include "classfile/classLoaderStats.hpp"
29 #include "compiler/compileBroker.hpp"
30 #include "compiler/directivesParser.hpp"
31 #include "gc/shared/gcVMOperations.hpp"
32 #include "memory/metaspace/metaspaceDCmd.hpp"
33 #include "memory/resourceArea.hpp"
34 #include "memory/universe.hpp"
35 #include "oops/objArrayOop.inline.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "oops/typeArrayOop.inline.hpp"
38 #include "runtime/fieldDescriptor.inline.hpp"
39 #include "runtime/flags/jvmFlag.hpp"
40 #include "runtime/handles.inline.hpp"
41 #include "runtime/interfaceSupport.inline.hpp"
42 #include "runtime/javaCalls.hpp"
43 #include "runtime/os.hpp"
44 #include "services/diagnosticArgument.hpp"
45 #include "services/diagnosticCommand.hpp"
46 #include "services/diagnosticFramework.hpp"
47 #include "services/heapDumper.hpp"
48 #include "services/management.hpp"
49 #include "services/writeableFlags.hpp"
50 #include "utilities/debug.hpp"
51 #include "utilities/events.hpp"
52 #include "utilities/formatBuffer.hpp"
53 #include "utilities/macros.hpp"
54
55
56 static void loadAgentModule(TRAPS) {
57 ResourceMark rm(THREAD);
58 HandleMark hm(THREAD);
59
60 JavaValue result(T_OBJECT);
61 Handle h_module_name = java_lang_String::create_from_str("jdk.management.agent", CHECK);
62 JavaCalls::call_static(&result,
63 SystemDictionary::module_Modules_klass(),
64 vmSymbols::loadModule_name(),
65 vmSymbols::loadModule_signature(),
66 h_module_name,
67 THREAD);
68 }
69
70 void DCmdRegistrant::register_dcmds(){
71 // Registration of the diagnostic commands
72 // First argument specifies which interfaces will export the command
73 // Second argument specifies if the command is enabled
74 // Third argument specifies if the command is hidden
75 uint32_t full_export = DCmd_Source_Internal | DCmd_Source_AttachAPI
76 | DCmd_Source_MBean;
77 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<HelpDCmd>(full_export, true, false));
78 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<VersionDCmd>(full_export, true, false));
79 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CommandLineDCmd>(full_export, true, false));
80 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<PrintSystemPropertiesDCmd>(full_export, true, false));
81 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<PrintVMFlagsDCmd>(full_export, true, false));
82 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<SetVMFlagDCmd>(full_export, true, false));
83 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<VMDynamicLibrariesDCmd>(full_export, true, false));
84 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<VMUptimeDCmd>(full_export, true, false));
85 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<VMInfoDCmd>(full_export, true, false));
86 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<SystemGCDCmd>(full_export, true, false));
87 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<RunFinalizationDCmd>(full_export, true, false));
88 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<HeapInfoDCmd>(full_export, true, false));
89 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<FinalizerInfoDCmd>(full_export, true, false));
90 #if INCLUDE_SERVICES
91 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<HeapDumpDCmd>(DCmd_Source_Internal | DCmd_Source_AttachAPI, true, false));
92 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<ClassHistogramDCmd>(full_export, true, false));
93 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<ClassStatsDCmd>(full_export, true, false));
94 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<SystemDictionaryDCmd>(full_export, true, false));
95 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<ClassHierarchyDCmd>(full_export, true, false));
96 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<SymboltableDCmd>(full_export, true, false));
97 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<StringtableDCmd>(full_export, true, false));
98 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<metaspace::MetaspaceDCmd>(full_export, true, false));
99 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<EventLogDCmd>(full_export, true, false));
100 #if INCLUDE_JVMTI // Both JVMTI and SERVICES have to be enabled to have this dcmd
101 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JVMTIAgentLoadDCmd>(full_export, true, false));
102 #endif // INCLUDE_JVMTI
103 #endif // INCLUDE_SERVICES
104 #if INCLUDE_JVMTI
105 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JVMTIDataDumpDCmd>(full_export, true, false));
106 #endif // INCLUDE_JVMTI
107 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<ThreadDumpDCmd>(full_export, true, false));
108 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<ClassLoaderStatsDCmd>(full_export, true, false));
109 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<ClassLoaderHierarchyDCmd>(full_export, true, false));
110 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CompileQueueDCmd>(full_export, true, false));
111 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CodeListDCmd>(full_export, true, false));
112 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CodeCacheDCmd>(full_export, true, false));
113 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<TouchedMethodsDCmd>(full_export, true, false));
114 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CodeHeapAnalyticsDCmd>(full_export, true, false));
115
116 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CompilerDirectivesPrintDCmd>(full_export, true, false));
117 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CompilerDirectivesAddDCmd>(full_export, true, false));
118 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CompilerDirectivesRemoveDCmd>(full_export, true, false));
119 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CompilerDirectivesClearDCmd>(full_export, true, false));
120
121 // Enhanced JMX Agent Support
122 // These commands won't be exported via the DiagnosticCommandMBean until an
123 // appropriate permission is created for them
124 uint32_t jmx_agent_export_flags = DCmd_Source_Internal | DCmd_Source_AttachAPI;
125 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JMXStartRemoteDCmd>(jmx_agent_export_flags, true,false));
126 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JMXStartLocalDCmd>(jmx_agent_export_flags, true,false));
127 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JMXStopRemoteDCmd>(jmx_agent_export_flags, true,false));
128 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JMXStatusDCmd>(jmx_agent_export_flags, true,false));
129
130 // Debug on cmd (only makes sense with JVMTI since the agentlib needs it).
131 #if INCLUDE_JVMTI
132 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<DebugOnCmdStartDCmd>(full_export, true, true));
133 #endif // INCLUDE_JVMTI
134
135 }
136
137 #ifndef HAVE_EXTRA_DCMD
138 void DCmdRegistrant::register_dcmds_ext(){
139 // Do nothing here
140 }
141 #endif
142
143
144 HelpDCmd::HelpDCmd(outputStream* output, bool heap) : DCmdWithParser(output, heap),
145 _all("-all", "Show help for all commands", "BOOLEAN", false, "false"),
146 _cmd("command name", "The name of the command for which we want help",
147 "STRING", false) {
148 _dcmdparser.add_dcmd_option(&_all);
149 _dcmdparser.add_dcmd_argument(&_cmd);
150 };
151
152
153 static int compare_strings(const char** s1, const char** s2) {
154 return ::strcmp(*s1, *s2);
155 }
156
157 void HelpDCmd::execute(DCmdSource source, TRAPS) {
158 if (_all.value()) {
159 GrowableArray<const char*>* cmd_list = DCmdFactory::DCmd_list(source);
160 cmd_list->sort(compare_strings);
161 for (int i = 0; i < cmd_list->length(); i++) {
162 DCmdFactory* factory = DCmdFactory::factory(source, cmd_list->at(i),
163 strlen(cmd_list->at(i)));
164 output()->print_cr("%s%s", factory->name(),
165 factory->is_enabled() ? "" : " [disabled]");
166 output()->print_cr("\t%s", factory->description());
167 output()->cr();
168 factory = factory->next();
169 }
170 } else if (_cmd.has_value()) {
171 DCmd* cmd = NULL;
172 DCmdFactory* factory = DCmdFactory::factory(source, _cmd.value(),
173 strlen(_cmd.value()));
174 if (factory != NULL) {
175 output()->print_cr("%s%s", factory->name(),
176 factory->is_enabled() ? "" : " [disabled]");
177 output()->print_cr("%s", factory->description());
178 output()->print_cr("\nImpact: %s", factory->impact());
179 JavaPermission p = factory->permission();
180 if(p._class != NULL) {
181 if(p._action != NULL) {
182 output()->print_cr("\nPermission: %s(%s, %s)",
183 p._class, p._name == NULL ? "null" : p._name, p._action);
184 } else {
185 output()->print_cr("\nPermission: %s(%s)",
186 p._class, p._name == NULL ? "null" : p._name);
187 }
188 }
189 output()->cr();
190 cmd = factory->create_resource_instance(output());
191 if (cmd != NULL) {
192 DCmdMark mark(cmd);
193 cmd->print_help(factory->name());
194 }
195 } else {
196 output()->print_cr("Help unavailable : '%s' : No such command", _cmd.value());
197 }
198 } else {
199 output()->print_cr("The following commands are available:");
200 GrowableArray<const char *>* cmd_list = DCmdFactory::DCmd_list(source);
201 cmd_list->sort(compare_strings);
202 for (int i = 0; i < cmd_list->length(); i++) {
203 DCmdFactory* factory = DCmdFactory::factory(source, cmd_list->at(i),
204 strlen(cmd_list->at(i)));
205 output()->print_cr("%s%s", factory->name(),
206 factory->is_enabled() ? "" : " [disabled]");
207 factory = factory->_next;
208 }
209 output()->print_cr("\nFor more information about a specific command use 'help <command>'.");
210 }
211 }
212
213 int HelpDCmd::num_arguments() {
214 ResourceMark rm;
215 HelpDCmd* dcmd = new HelpDCmd(NULL, false);
216 if (dcmd != NULL) {
217 DCmdMark mark(dcmd);
218 return dcmd->_dcmdparser.num_arguments();
219 } else {
220 return 0;
221 }
222 }
223
224 void VersionDCmd::execute(DCmdSource source, TRAPS) {
225 output()->print_cr("%s version %s", VM_Version::vm_name(),
226 VM_Version::vm_release());
227 JDK_Version jdk_version = JDK_Version::current();
228 if (jdk_version.patch_version() > 0) {
229 output()->print_cr("JDK %d.%d.%d.%d", jdk_version.major_version(),
230 jdk_version.minor_version(), jdk_version.security_version(),
231 jdk_version.patch_version());
232 } else {
233 output()->print_cr("JDK %d.%d.%d", jdk_version.major_version(),
234 jdk_version.minor_version(), jdk_version.security_version());
235 }
236 }
237
238 PrintVMFlagsDCmd::PrintVMFlagsDCmd(outputStream* output, bool heap) :
239 DCmdWithParser(output, heap),
240 _all("-all", "Print all flags supported by the VM", "BOOLEAN", false, "false") {
241 _dcmdparser.add_dcmd_option(&_all);
242 }
243
244 void PrintVMFlagsDCmd::execute(DCmdSource source, TRAPS) {
245 if (_all.value()) {
246 JVMFlag::printFlags(output(), true);
247 } else {
248 JVMFlag::printSetFlags(output());
249 }
250 }
251
252 int PrintVMFlagsDCmd::num_arguments() {
253 ResourceMark rm;
254 PrintVMFlagsDCmd* dcmd = new PrintVMFlagsDCmd(NULL, false);
255 if (dcmd != NULL) {
256 DCmdMark mark(dcmd);
257 return dcmd->_dcmdparser.num_arguments();
258 } else {
259 return 0;
260 }
261 }
262
263 SetVMFlagDCmd::SetVMFlagDCmd(outputStream* output, bool heap) :
264 DCmdWithParser(output, heap),
265 _flag("flag name", "The name of the flag we want to set",
266 "STRING", true),
267 _value("string value", "The value we want to set", "STRING", false) {
268 _dcmdparser.add_dcmd_argument(&_flag);
269 _dcmdparser.add_dcmd_argument(&_value);
270 }
271
272 void SetVMFlagDCmd::execute(DCmdSource source, TRAPS) {
273 const char* val = NULL;
274 if (_value.value() != NULL) {
275 val = _value.value();
276 }
277
278 FormatBuffer<80> err_msg("%s", "");
279 int ret = WriteableFlags::set_flag(_flag.value(), val, JVMFlag::MANAGEMENT, err_msg);
280
281 if (ret != JVMFlag::SUCCESS) {
282 output()->print_cr("%s", err_msg.buffer());
283 }
284 }
285
286 int SetVMFlagDCmd::num_arguments() {
287 ResourceMark rm;
288 SetVMFlagDCmd* dcmd = new SetVMFlagDCmd(NULL, false);
289 if (dcmd != NULL) {
290 DCmdMark mark(dcmd);
291 return dcmd->_dcmdparser.num_arguments();
292 } else {
293 return 0;
294 }
295 }
296
297 void JVMTIDataDumpDCmd::execute(DCmdSource source, TRAPS) {
298 if (JvmtiExport::should_post_data_dump()) {
299 JvmtiExport::post_data_dump();
300 }
301 }
302
303 #if INCLUDE_SERVICES
304 JVMTIAgentLoadDCmd::JVMTIAgentLoadDCmd(outputStream* output, bool heap) :
305 DCmdWithParser(output, heap),
306 _libpath("library path", "Absolute path of the JVMTI agent to load.",
307 "STRING", true),
308 _option("agent option", "Option string to pass the agent.", "STRING", false) {
309 _dcmdparser.add_dcmd_argument(&_libpath);
310 _dcmdparser.add_dcmd_argument(&_option);
311 }
312
313 void JVMTIAgentLoadDCmd::execute(DCmdSource source, TRAPS) {
314
315 if (_libpath.value() == NULL) {
316 output()->print_cr("JVMTI.agent_load dcmd needs library path.");
317 return;
318 }
319
320 char *suffix = strrchr(_libpath.value(), '.');
321 bool is_java_agent = (suffix != NULL) && (strncmp(".jar", suffix, 4) == 0);
322
323 if (is_java_agent) {
324 if (_option.value() == NULL) {
325 JvmtiExport::load_agent_library("instrument", "false",
326 _libpath.value(), output());
327 } else {
328 size_t opt_len = strlen(_libpath.value()) + strlen(_option.value()) + 2;
329 if (opt_len > 4096) {
330 output()->print_cr("JVMTI agent attach failed: Options is too long.");
331 return;
332 }
333
334 char *opt = (char *)os::malloc(opt_len, mtInternal);
335 if (opt == NULL) {
336 output()->print_cr("JVMTI agent attach failed: "
337 "Could not allocate " SIZE_FORMAT " bytes for argument.",
338 opt_len);
339 return;
340 }
341
342 jio_snprintf(opt, opt_len, "%s=%s", _libpath.value(), _option.value());
343 JvmtiExport::load_agent_library("instrument", "false", opt, output());
344
345 os::free(opt);
346 }
347 } else {
348 JvmtiExport::load_agent_library(_libpath.value(), "true",
349 _option.value(), output());
350 }
351 }
352
353 int JVMTIAgentLoadDCmd::num_arguments() {
354 ResourceMark rm;
355 JVMTIAgentLoadDCmd* dcmd = new JVMTIAgentLoadDCmd(NULL, false);
356 if (dcmd != NULL) {
357 DCmdMark mark(dcmd);
358 return dcmd->_dcmdparser.num_arguments();
359 } else {
360 return 0;
361 }
362 }
363 #endif // INCLUDE_SERVICES
364
365 void PrintSystemPropertiesDCmd::execute(DCmdSource source, TRAPS) {
366 // load VMSupport
367 Symbol* klass = vmSymbols::jdk_internal_vm_VMSupport();
368 Klass* k = SystemDictionary::resolve_or_fail(klass, true, CHECK);
369 InstanceKlass* ik = InstanceKlass::cast(k);
370 if (ik->should_be_initialized()) {
371 ik->initialize(THREAD);
372 }
373 if (HAS_PENDING_EXCEPTION) {
374 java_lang_Throwable::print(PENDING_EXCEPTION, output());
375 output()->cr();
376 CLEAR_PENDING_EXCEPTION;
377 return;
378 }
379
380 // invoke the serializePropertiesToByteArray method
381 JavaValue result(T_OBJECT);
382 JavaCallArguments args;
383
384 Symbol* signature = vmSymbols::serializePropertiesToByteArray_signature();
385 JavaCalls::call_static(&result,
386 ik,
387 vmSymbols::serializePropertiesToByteArray_name(),
388 signature,
389 &args,
390 THREAD);
391 if (HAS_PENDING_EXCEPTION) {
392 java_lang_Throwable::print(PENDING_EXCEPTION, output());
393 output()->cr();
394 CLEAR_PENDING_EXCEPTION;
395 return;
396 }
397
398 // The result should be a [B
399 oop res = (oop)result.get_jobject();
400 assert(res->is_typeArray(), "just checking");
401 assert(TypeArrayKlass::cast(res->klass())->element_type() == T_BYTE, "just checking");
402
403 // copy the bytes to the output stream
404 typeArrayOop ba = typeArrayOop(res);
405 jbyte* addr = typeArrayOop(res)->byte_at_addr(0);
406 output()->print_raw((const char*)addr, ba->length());
407 }
408
409 VMUptimeDCmd::VMUptimeDCmd(outputStream* output, bool heap) :
410 DCmdWithParser(output, heap),
411 _date("-date", "Add a prefix with current date", "BOOLEAN", false, "false") {
412 _dcmdparser.add_dcmd_option(&_date);
413 }
414
415 void VMUptimeDCmd::execute(DCmdSource source, TRAPS) {
416 if (_date.value()) {
417 output()->date_stamp(true, "", ": ");
418 }
419 output()->time_stamp().update_to(tty->time_stamp().ticks());
420 output()->stamp();
421 output()->print_cr(" s");
422 }
423
424 int VMUptimeDCmd::num_arguments() {
425 ResourceMark rm;
426 VMUptimeDCmd* dcmd = new VMUptimeDCmd(NULL, false);
427 if (dcmd != NULL) {
428 DCmdMark mark(dcmd);
429 return dcmd->_dcmdparser.num_arguments();
430 } else {
431 return 0;
432 }
433 }
434
435 void VMInfoDCmd::execute(DCmdSource source, TRAPS) {
436 VMError::print_vm_info(_output);
437 }
438
439 void SystemGCDCmd::execute(DCmdSource source, TRAPS) {
440 Universe::heap()->collect(GCCause::_dcmd_gc_run);
441 }
442
443 void RunFinalizationDCmd::execute(DCmdSource source, TRAPS) {
444 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(),
445 true, CHECK);
446 JavaValue result(T_VOID);
447 JavaCalls::call_static(&result, k,
448 vmSymbols::run_finalization_name(),
449 vmSymbols::void_method_signature(), CHECK);
450 }
451
452 void HeapInfoDCmd::execute(DCmdSource source, TRAPS) {
453 MutexLocker hl(Heap_lock);
454 Universe::heap()->print_on(output());
455 }
456
457 void FinalizerInfoDCmd::execute(DCmdSource source, TRAPS) {
458 ResourceMark rm;
459
460 Klass* k = SystemDictionary::resolve_or_fail(
461 vmSymbols::finalizer_histogram_klass(), true, CHECK);
462
463 JavaValue result(T_ARRAY);
464
465 // We are calling lang.ref.FinalizerHistogram.getFinalizerHistogram() method
466 // and expect it to return array of FinalizerHistogramEntry as Object[]
467
468 JavaCalls::call_static(&result, k,
469 vmSymbols::get_finalizer_histogram_name(),
470 vmSymbols::void_finalizer_histogram_entry_array_signature(), CHECK);
471
472 objArrayOop result_oop = (objArrayOop) result.get_jobject();
473 if (result_oop->length() == 0) {
474 output()->print_cr("No instances waiting for finalization found");
475 return;
476 }
477
478 oop foop = result_oop->obj_at(0);
479 InstanceKlass* ik = InstanceKlass::cast(foop->klass());
480
481 fieldDescriptor count_fd, name_fd;
482
483 Klass* count_res = ik->find_field(
484 vmSymbols::finalizer_histogram_entry_count_field(), vmSymbols::int_signature(), &count_fd);
485
486 Klass* name_res = ik->find_field(
487 vmSymbols::finalizer_histogram_entry_name_field(), vmSymbols::string_signature(), &name_fd);
488
489 assert(count_res != NULL && name_res != NULL, "Unexpected layout of FinalizerHistogramEntry");
490
491 output()->print_cr("Unreachable instances waiting for finalization");
492 output()->print_cr("#instances class name");
493 output()->print_cr("-----------------------");
494
495 for (int i = 0; i < result_oop->length(); ++i) {
496 oop element_oop = result_oop->obj_at(i);
497 oop str_oop = element_oop->obj_field(name_fd.offset());
498 char *name = java_lang_String::as_utf8_string(str_oop);
499 int count = element_oop->int_field(count_fd.offset());
500 output()->print_cr("%10d %s", count, name);
501 }
502 }
503
504 #if INCLUDE_SERVICES // Heap dumping/inspection supported
505 HeapDumpDCmd::HeapDumpDCmd(outputStream* output, bool heap) :
506 DCmdWithParser(output, heap),
507 _filename("filename","Name of the dump file", "STRING",true),
508 _all("-all", "Dump all objects, including unreachable objects",
509 "BOOLEAN", false, "false") {
510 _dcmdparser.add_dcmd_option(&_all);
511 _dcmdparser.add_dcmd_argument(&_filename);
512 }
513
514 void HeapDumpDCmd::execute(DCmdSource source, TRAPS) {
515 // Request a full GC before heap dump if _all is false
516 // This helps reduces the amount of unreachable objects in the dump
517 // and makes it easier to browse.
518 HeapDumper dumper(!_all.value() /* request GC if _all is false*/);
519 dumper.dump(_filename.value(), output());
520 }
521
522 int HeapDumpDCmd::num_arguments() {
523 ResourceMark rm;
524 HeapDumpDCmd* dcmd = new HeapDumpDCmd(NULL, false);
525 if (dcmd != NULL) {
526 DCmdMark mark(dcmd);
527 return dcmd->_dcmdparser.num_arguments();
528 } else {
529 return 0;
530 }
531 }
532
533 ClassHistogramDCmd::ClassHistogramDCmd(outputStream* output, bool heap) :
534 DCmdWithParser(output, heap),
535 _all("-all", "Inspect all objects, including unreachable objects",
536 "BOOLEAN", false, "false") {
537 _dcmdparser.add_dcmd_option(&_all);
538 }
539
540 void ClassHistogramDCmd::execute(DCmdSource source, TRAPS) {
541 VM_GC_HeapInspection heapop(output(),
542 !_all.value() /* request full gc if false */);
543 VMThread::execute(&heapop);
544 }
545
546 int ClassHistogramDCmd::num_arguments() {
547 ResourceMark rm;
548 ClassHistogramDCmd* dcmd = new ClassHistogramDCmd(NULL, false);
549 if (dcmd != NULL) {
550 DCmdMark mark(dcmd);
551 return dcmd->_dcmdparser.num_arguments();
552 } else {
553 return 0;
554 }
555 }
556
557 #define DEFAULT_COLUMNS "InstBytes,KlassBytes,CpAll,annotations,MethodCount,Bytecodes,MethodAll,ROAll,RWAll,Total"
558 ClassStatsDCmd::ClassStatsDCmd(outputStream* output, bool heap) :
559 DCmdWithParser(output, heap),
560 _all("-all", "Show all columns",
561 "BOOLEAN", false, "false"),
562 _csv("-csv", "Print in CSV (comma-separated values) format for spreadsheets",
563 "BOOLEAN", false, "false"),
564 _help("-help", "Show meaning of all the columns",
565 "BOOLEAN", false, "false"),
566 _columns("columns", "Comma-separated list of all the columns to show. "
567 "If not specified, the following columns are shown: " DEFAULT_COLUMNS,
568 "STRING", false) {
569 _dcmdparser.add_dcmd_option(&_all);
570 _dcmdparser.add_dcmd_option(&_csv);
571 _dcmdparser.add_dcmd_option(&_help);
572 _dcmdparser.add_dcmd_argument(&_columns);
573 }
574
575 void ClassStatsDCmd::execute(DCmdSource source, TRAPS) {
576 VM_GC_HeapInspection heapop(output(),
577 true /* request_full_gc */);
578 heapop.set_csv_format(_csv.value());
579 heapop.set_print_help(_help.value());
580 heapop.set_print_class_stats(true);
581 if (_all.value()) {
582 if (_columns.has_value()) {
583 output()->print_cr("Cannot specify -all and individual columns at the same time");
584 return;
585 } else {
586 heapop.set_columns(NULL);
587 }
588 } else {
589 if (_columns.has_value()) {
590 heapop.set_columns(_columns.value());
591 } else {
592 heapop.set_columns(DEFAULT_COLUMNS);
593 }
594 }
595 VMThread::execute(&heapop);
596 }
597
598 int ClassStatsDCmd::num_arguments() {
599 ResourceMark rm;
600 ClassStatsDCmd* dcmd = new ClassStatsDCmd(NULL, false);
601 if (dcmd != NULL) {
602 DCmdMark mark(dcmd);
603 return dcmd->_dcmdparser.num_arguments();
604 } else {
605 return 0;
606 }
607 }
608 #endif // INCLUDE_SERVICES
609
610 ThreadDumpDCmd::ThreadDumpDCmd(outputStream* output, bool heap) :
611 DCmdWithParser(output, heap),
612 _locks("-l", "print java.util.concurrent locks", "BOOLEAN", false, "false"),
613 _extended("-e", "print extended thread information", "BOOLEAN", false, "false") {
614 _dcmdparser.add_dcmd_option(&_locks);
615 _dcmdparser.add_dcmd_option(&_extended);
616 }
617
618 void ThreadDumpDCmd::execute(DCmdSource source, TRAPS) {
619 // thread stacks
620 VM_PrintThreads op1(output(), _locks.value(), _extended.value());
621 VMThread::execute(&op1);
622
623 // JNI global handles
624 VM_PrintJNI op2(output());
625 VMThread::execute(&op2);
626
627 // Deadlock detection
628 VM_FindDeadlocks op3(output());
629 VMThread::execute(&op3);
630 }
631
632 int ThreadDumpDCmd::num_arguments() {
633 ResourceMark rm;
634 ThreadDumpDCmd* dcmd = new ThreadDumpDCmd(NULL, false);
635 if (dcmd != NULL) {
636 DCmdMark mark(dcmd);
637 return dcmd->_dcmdparser.num_arguments();
638 } else {
639 return 0;
640 }
641 }
642
643 // Enhanced JMX Agent support
644
645 JMXStartRemoteDCmd::JMXStartRemoteDCmd(outputStream *output, bool heap_allocated) :
646
647 DCmdWithParser(output, heap_allocated),
648
649 _config_file
650 ("config.file",
651 "set com.sun.management.config.file", "STRING", false),
652
653 _jmxremote_host
654 ("jmxremote.host",
655 "set com.sun.management.jmxremote.host", "STRING", false),
656
657 _jmxremote_port
658 ("jmxremote.port",
659 "set com.sun.management.jmxremote.port", "STRING", false),
660
661 _jmxremote_rmi_port
662 ("jmxremote.rmi.port",
663 "set com.sun.management.jmxremote.rmi.port", "STRING", false),
664
665 _jmxremote_ssl
666 ("jmxremote.ssl",
667 "set com.sun.management.jmxremote.ssl", "STRING", false),
668
669 _jmxremote_registry_ssl
670 ("jmxremote.registry.ssl",
671 "set com.sun.management.jmxremote.registry.ssl", "STRING", false),
672
673 _jmxremote_authenticate
674 ("jmxremote.authenticate",
675 "set com.sun.management.jmxremote.authenticate", "STRING", false),
676
677 _jmxremote_password_file
678 ("jmxremote.password.file",
679 "set com.sun.management.jmxremote.password.file", "STRING", false),
680
681 _jmxremote_access_file
682 ("jmxremote.access.file",
683 "set com.sun.management.jmxremote.access.file", "STRING", false),
684
685 _jmxremote_login_config
686 ("jmxremote.login.config",
687 "set com.sun.management.jmxremote.login.config", "STRING", false),
688
689 _jmxremote_ssl_enabled_cipher_suites
690 ("jmxremote.ssl.enabled.cipher.suites",
691 "set com.sun.management.jmxremote.ssl.enabled.cipher.suite", "STRING", false),
692
693 _jmxremote_ssl_enabled_protocols
694 ("jmxremote.ssl.enabled.protocols",
695 "set com.sun.management.jmxremote.ssl.enabled.protocols", "STRING", false),
696
697 _jmxremote_ssl_need_client_auth
698 ("jmxremote.ssl.need.client.auth",
699 "set com.sun.management.jmxremote.need.client.auth", "STRING", false),
700
701 _jmxremote_ssl_config_file
702 ("jmxremote.ssl.config.file",
703 "set com.sun.management.jmxremote.ssl.config.file", "STRING", false),
704
705 // JDP Protocol support
706 _jmxremote_autodiscovery
707 ("jmxremote.autodiscovery",
708 "set com.sun.management.jmxremote.autodiscovery", "STRING", false),
709
710 _jdp_port
711 ("jdp.port",
712 "set com.sun.management.jdp.port", "INT", false),
713
714 _jdp_address
715 ("jdp.address",
716 "set com.sun.management.jdp.address", "STRING", false),
717
718 _jdp_source_addr
719 ("jdp.source_addr",
720 "set com.sun.management.jdp.source_addr", "STRING", false),
721
722 _jdp_ttl
723 ("jdp.ttl",
724 "set com.sun.management.jdp.ttl", "INT", false),
725
726 _jdp_pause
727 ("jdp.pause",
728 "set com.sun.management.jdp.pause", "INT", false),
729
730 _jdp_name
731 ("jdp.name",
732 "set com.sun.management.jdp.name", "STRING", false)
733
734 {
735 _dcmdparser.add_dcmd_option(&_config_file);
736 _dcmdparser.add_dcmd_option(&_jmxremote_host);
737 _dcmdparser.add_dcmd_option(&_jmxremote_port);
738 _dcmdparser.add_dcmd_option(&_jmxremote_rmi_port);
739 _dcmdparser.add_dcmd_option(&_jmxremote_ssl);
740 _dcmdparser.add_dcmd_option(&_jmxremote_registry_ssl);
741 _dcmdparser.add_dcmd_option(&_jmxremote_authenticate);
742 _dcmdparser.add_dcmd_option(&_jmxremote_password_file);
743 _dcmdparser.add_dcmd_option(&_jmxremote_access_file);
744 _dcmdparser.add_dcmd_option(&_jmxremote_login_config);
745 _dcmdparser.add_dcmd_option(&_jmxremote_ssl_enabled_cipher_suites);
746 _dcmdparser.add_dcmd_option(&_jmxremote_ssl_enabled_protocols);
747 _dcmdparser.add_dcmd_option(&_jmxremote_ssl_need_client_auth);
748 _dcmdparser.add_dcmd_option(&_jmxremote_ssl_config_file);
749 _dcmdparser.add_dcmd_option(&_jmxremote_autodiscovery);
750 _dcmdparser.add_dcmd_option(&_jdp_port);
751 _dcmdparser.add_dcmd_option(&_jdp_address);
752 _dcmdparser.add_dcmd_option(&_jdp_source_addr);
753 _dcmdparser.add_dcmd_option(&_jdp_ttl);
754 _dcmdparser.add_dcmd_option(&_jdp_pause);
755 _dcmdparser.add_dcmd_option(&_jdp_name);
756 }
757
758
759 int JMXStartRemoteDCmd::num_arguments() {
760 ResourceMark rm;
761 JMXStartRemoteDCmd* dcmd = new JMXStartRemoteDCmd(NULL, false);
762 if (dcmd != NULL) {
763 DCmdMark mark(dcmd);
764 return dcmd->_dcmdparser.num_arguments();
765 } else {
766 return 0;
767 }
768 }
769
770
771 void JMXStartRemoteDCmd::execute(DCmdSource source, TRAPS) {
772 ResourceMark rm(THREAD);
773 HandleMark hm(THREAD);
774
775 // Load and initialize the jdk.internal.agent.Agent class
776 // invoke startRemoteManagementAgent(string) method to start
777 // the remote management server.
778 // throw java.lang.NoSuchMethodError if the method doesn't exist
779
780 loadAgentModule(CHECK);
781 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
782 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::jdk_internal_agent_Agent(), loader, Handle(), true, CHECK);
783
784 JavaValue result(T_VOID);
785
786 // Pass all command line arguments to java as key=value,...
787 // All checks are done on java side
788
789 int len = 0;
790 stringStream options;
791 char comma[2] = {0,0};
792
793 // Leave default values on Agent.class side and pass only
794 // agruments explicitly set by user. All arguments passed
795 // to jcmd override properties with the same name set by
796 // command line with -D or by managmenent.properties
797 // file.
798 #define PUT_OPTION(a) \
799 do { \
800 if ( (a).is_set() ){ \
801 if ( *((a).type()) == 'I' ) { \
802 options.print("%scom.sun.management.%s=" JLONG_FORMAT, comma, (a).name(), (jlong)((a).value())); \
803 } else { \
804 options.print("%scom.sun.management.%s=%s", comma, (a).name(), (char*)((a).value())); \
805 } \
806 comma[0] = ','; \
807 }\
808 } while(0);
809
810
811 PUT_OPTION(_config_file);
812 PUT_OPTION(_jmxremote_host);
813 PUT_OPTION(_jmxremote_port);
814 PUT_OPTION(_jmxremote_rmi_port);
815 PUT_OPTION(_jmxremote_ssl);
816 PUT_OPTION(_jmxremote_registry_ssl);
817 PUT_OPTION(_jmxremote_authenticate);
818 PUT_OPTION(_jmxremote_password_file);
819 PUT_OPTION(_jmxremote_access_file);
820 PUT_OPTION(_jmxremote_login_config);
821 PUT_OPTION(_jmxremote_ssl_enabled_cipher_suites);
822 PUT_OPTION(_jmxremote_ssl_enabled_protocols);
823 PUT_OPTION(_jmxremote_ssl_need_client_auth);
824 PUT_OPTION(_jmxremote_ssl_config_file);
825 PUT_OPTION(_jmxremote_autodiscovery);
826 PUT_OPTION(_jdp_port);
827 PUT_OPTION(_jdp_address);
828 PUT_OPTION(_jdp_source_addr);
829 PUT_OPTION(_jdp_ttl);
830 PUT_OPTION(_jdp_pause);
831 PUT_OPTION(_jdp_name);
832
833 #undef PUT_OPTION
834
835 Handle str = java_lang_String::create_from_str(options.as_string(), CHECK);
836 JavaCalls::call_static(&result, k, vmSymbols::startRemoteAgent_name(), vmSymbols::string_void_signature(), str, CHECK);
837 }
838
839 JMXStartLocalDCmd::JMXStartLocalDCmd(outputStream *output, bool heap_allocated) :
840 DCmd(output, heap_allocated) {
841 // do nothing
842 }
843
844 void JMXStartLocalDCmd::execute(DCmdSource source, TRAPS) {
845 ResourceMark rm(THREAD);
846 HandleMark hm(THREAD);
847
848 // Load and initialize the jdk.internal.agent.Agent class
849 // invoke startLocalManagementAgent(void) method to start
850 // the local management server
851 // throw java.lang.NoSuchMethodError if method doesn't exist
852
853 loadAgentModule(CHECK);
854 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
855 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::jdk_internal_agent_Agent(), loader, Handle(), true, CHECK);
856
857 JavaValue result(T_VOID);
858 JavaCalls::call_static(&result, k, vmSymbols::startLocalAgent_name(), vmSymbols::void_method_signature(), CHECK);
859 }
860
861 void JMXStopRemoteDCmd::execute(DCmdSource source, TRAPS) {
862 ResourceMark rm(THREAD);
863 HandleMark hm(THREAD);
864
865 // Load and initialize the jdk.internal.agent.Agent class
866 // invoke stopRemoteManagementAgent method to stop the
867 // management server
868 // throw java.lang.NoSuchMethodError if method doesn't exist
869
870 loadAgentModule(CHECK);
871 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
872 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::jdk_internal_agent_Agent(), loader, Handle(), true, CHECK);
873
874 JavaValue result(T_VOID);
875 JavaCalls::call_static(&result, k, vmSymbols::stopRemoteAgent_name(), vmSymbols::void_method_signature(), CHECK);
876 }
877
878 JMXStatusDCmd::JMXStatusDCmd(outputStream *output, bool heap_allocated) :
879 DCmd(output, heap_allocated) {
880 // do nothing
881 }
882
883 void JMXStatusDCmd::execute(DCmdSource source, TRAPS) {
884 ResourceMark rm(THREAD);
885 HandleMark hm(THREAD);
886
887 // Load and initialize the jdk.internal.agent.Agent class
888 // invoke getManagementAgentStatus() method to generate the status info
889 // throw java.lang.NoSuchMethodError if method doesn't exist
890
891 loadAgentModule(CHECK);
892 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
893 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::jdk_internal_agent_Agent(), loader, Handle(), true, CHECK);
894
895 JavaValue result(T_OBJECT);
896 JavaCalls::call_static(&result, k, vmSymbols::getAgentStatus_name(), vmSymbols::void_string_signature(), CHECK);
897
898 jvalue* jv = (jvalue*) result.get_value_addr();
899 oop str = (oop) jv->l;
900 if (str != NULL) {
901 char* out = java_lang_String::as_utf8_string(str);
902 if (out) {
903 output()->print_cr("%s", out);
904 return;
905 }
906 }
907 output()->print_cr("Error obtaining management agent status");
908 }
909
910 VMDynamicLibrariesDCmd::VMDynamicLibrariesDCmd(outputStream *output, bool heap_allocated) :
911 DCmd(output, heap_allocated) {
912 // do nothing
913 }
914
915 void VMDynamicLibrariesDCmd::execute(DCmdSource source, TRAPS) {
916 os::print_dll_info(output());
917 output()->cr();
918 }
919
920 void CompileQueueDCmd::execute(DCmdSource source, TRAPS) {
921 VM_PrintCompileQueue printCompileQueueOp(output());
922 VMThread::execute(&printCompileQueueOp);
923 }
924
925 void CodeListDCmd::execute(DCmdSource source, TRAPS) {
926 CodeCache::print_codelist(output());
927 }
928
929 void CodeCacheDCmd::execute(DCmdSource source, TRAPS) {
930 CodeCache::print_layout(output());
931 }
932
933 //---< BEGIN >--- CodeHeap State Analytics.
934 CodeHeapAnalyticsDCmd::CodeHeapAnalyticsDCmd(outputStream* output, bool heap) :
935 DCmdWithParser(output, heap),
936 _function("function", "Function to be performed (aggregate, UsedSpace, FreeSpace, MethodCount, MethodSpace, MethodAge, MethodNames, discard", "STRING", false, "all"),
937 _granularity("granularity", "Detail level - smaller value -> more detail", "INT", false, "4096") {
938 _dcmdparser.add_dcmd_argument(&_function);
939 _dcmdparser.add_dcmd_argument(&_granularity);
940 }
941
942 void CodeHeapAnalyticsDCmd::execute(DCmdSource source, TRAPS) {
943 jlong granularity = _granularity.value();
944 if (granularity < 1) {
945 Exceptions::fthrow(THREAD_AND_LOCATION, vmSymbols::java_lang_IllegalArgumentException(),
946 "Invalid granularity value " JLONG_FORMAT ". Should be positive.\n", granularity);
947 return;
948 }
949
950 CompileBroker::print_heapinfo(output(), _function.value(), granularity);
951 }
952
953 int CodeHeapAnalyticsDCmd::num_arguments() {
954 ResourceMark rm;
955 CodeHeapAnalyticsDCmd* dcmd = new CodeHeapAnalyticsDCmd(NULL, false);
956 if (dcmd != NULL) {
957 DCmdMark mark(dcmd);
958 return dcmd->_dcmdparser.num_arguments();
959 } else {
960 return 0;
961 }
962 }
963 //---< END >--- CodeHeap State Analytics.
964
965 EventLogDCmd::EventLogDCmd(outputStream* output, bool heap) :
966 DCmdWithParser(output, heap),
967 _log("log", "Name of log to be printed. If omitted, all logs are printed.", "STRING", false, NULL),
968 _max("max", "Maximum number of events to be printed (newest first). If omitted, all events are printed.", "STRING", false, NULL)
969 {
970 _dcmdparser.add_dcmd_option(&_log);
971 _dcmdparser.add_dcmd_option(&_max);
972 }
973
974 void EventLogDCmd::execute(DCmdSource source, TRAPS) {
975 const char* max_value = _max.value();
976 long max = -1;
977 if (max_value != NULL) {
978 char* endptr = NULL;
979 max = ::strtol(max_value, &endptr, 10);
980 if (max == 0 && max_value == endptr) {
981 output()->print_cr("Invalid max option: \"%s\".", max_value);
982 return;
983 }
984 }
985 const char* log_name = _log.value();
986 if (log_name != NULL) {
987 Events::print_one(output(), log_name, max);
988 } else {
989 Events::print_all(output(), max);
990 }
991 }
992
993 int EventLogDCmd::num_arguments() {
994 ResourceMark rm;
995 EventLogDCmd* dcmd = new EventLogDCmd(NULL, false);
996 if (dcmd != NULL) {
997 DCmdMark mark(dcmd);
998 return dcmd->_dcmdparser.num_arguments();
999 } else {
1000 return 0;
1001 }
1002 }
1003
1004 void CompilerDirectivesPrintDCmd::execute(DCmdSource source, TRAPS) {
1005 DirectivesStack::print(output());
1006 }
1007
1008 CompilerDirectivesAddDCmd::CompilerDirectivesAddDCmd(outputStream* output, bool heap) :
1009 DCmdWithParser(output, heap),
1010 _filename("filename","Name of the directives file", "STRING",true) {
1011 _dcmdparser.add_dcmd_argument(&_filename);
1012 }
1013
1014 void CompilerDirectivesAddDCmd::execute(DCmdSource source, TRAPS) {
1015 DirectivesParser::parse_from_file(_filename.value(), output());
1016 }
1017
1018 int CompilerDirectivesAddDCmd::num_arguments() {
1019 ResourceMark rm;
1020 CompilerDirectivesAddDCmd* dcmd = new CompilerDirectivesAddDCmd(NULL, false);
1021 if (dcmd != NULL) {
1022 DCmdMark mark(dcmd);
1023 return dcmd->_dcmdparser.num_arguments();
1024 } else {
1025 return 0;
1026 }
1027 }
1028
1029 void CompilerDirectivesRemoveDCmd::execute(DCmdSource source, TRAPS) {
1030 DirectivesStack::pop(1);
1031 }
1032
1033 void CompilerDirectivesClearDCmd::execute(DCmdSource source, TRAPS) {
1034 DirectivesStack::clear();
1035 }
1036 #if INCLUDE_SERVICES
1037 ClassHierarchyDCmd::ClassHierarchyDCmd(outputStream* output, bool heap) :
1038 DCmdWithParser(output, heap),
1039 _print_interfaces("-i", "Inherited interfaces should be printed.", "BOOLEAN", false, "false"),
1040 _print_subclasses("-s", "If a classname is specified, print its subclasses. "
1041 "Otherwise only its superclasses are printed.", "BOOLEAN", false, "false"),
1042 _classname("classname", "Name of class whose hierarchy should be printed. "
1043 "If not specified, all class hierarchies are printed.",
1044 "STRING", false) {
1045 _dcmdparser.add_dcmd_option(&_print_interfaces);
1046 _dcmdparser.add_dcmd_option(&_print_subclasses);
1047 _dcmdparser.add_dcmd_argument(&_classname);
1048 }
1049
1050 void ClassHierarchyDCmd::execute(DCmdSource source, TRAPS) {
1051 VM_PrintClassHierarchy printClassHierarchyOp(output(), _print_interfaces.value(),
1052 _print_subclasses.value(), _classname.value());
1053 VMThread::execute(&printClassHierarchyOp);
1054 }
1055
1056 int ClassHierarchyDCmd::num_arguments() {
1057 ResourceMark rm;
1058 ClassHierarchyDCmd* dcmd = new ClassHierarchyDCmd(NULL, false);
1059 if (dcmd != NULL) {
1060 DCmdMark mark(dcmd);
1061 return dcmd->_dcmdparser.num_arguments();
1062 } else {
1063 return 0;
1064 }
1065 }
1066
1067 #endif
1068
1069 class VM_DumpTouchedMethods : public VM_Operation {
1070 private:
1071 outputStream* _out;
1072 public:
1073 VM_DumpTouchedMethods(outputStream* out) {
1074 _out = out;
1075 }
1076
1077 virtual VMOp_Type type() const { return VMOp_DumpTouchedMethods; }
1078
1079 virtual void doit() {
1080 Method::print_touched_methods(_out);
1081 }
1082 };
1083
1084 TouchedMethodsDCmd::TouchedMethodsDCmd(outputStream* output, bool heap) :
1085 DCmdWithParser(output, heap)
1086 {}
1087
1088 void TouchedMethodsDCmd::execute(DCmdSource source, TRAPS) {
1089 if (!LogTouchedMethods) {
1090 output()->print_cr("VM.print_touched_methods command requires -XX:+LogTouchedMethods");
1091 return;
1092 }
1093 VM_DumpTouchedMethods dumper(output());
1094 VMThread::execute(&dumper);
1095 }
1096
1097 int TouchedMethodsDCmd::num_arguments() {
1098 return 0;
1099 }
1100
1101 #if INCLUDE_JVMTI
1102 extern "C" typedef char const* (JNICALL *debugInit_startDebuggingViaCommandPtr)(JNIEnv* env, jthread thread, char const** transport_name,
1103 char const** address, jboolean* first_start);
1104 static debugInit_startDebuggingViaCommandPtr dvc_start_ptr = NULL;
1105
1106 DebugOnCmdStartDCmd::DebugOnCmdStartDCmd(outputStream* output, bool heap) : DCmdWithParser(output, heap) {
1107 }
1108
1109 void DebugOnCmdStartDCmd::execute(DCmdSource source, TRAPS) {
1110 char const* transport = NULL;
1111 char const* addr = NULL;
1112 jboolean is_first_start = JNI_FALSE;
1113 JavaThread* thread = (JavaThread*) THREAD;
1114 jthread jt = JNIHandles::make_local(thread->threadObj());
1115 ThreadToNativeFromVM ttn(thread);
1116 const char *error = "Could not find jdwp agent.";
1117
1118 if (!dvc_start_ptr) {
1119 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) {
1120 if ((strcmp("jdwp", agent->name()) == 0) && (dvc_start_ptr == NULL)) {
1121 char const* func = "debugInit_startDebuggingViaCommand";
1122 dvc_start_ptr = (debugInit_startDebuggingViaCommandPtr) os::find_agent_function(agent, false, &func, 1);
1123 }
1124 }
1125 }
1126
1127 if (dvc_start_ptr) {
1128 error = dvc_start_ptr(thread->jni_environment(), jt, &transport, &addr, &is_first_start);
1129 }
1130
1131 if (error != NULL) {
1132 output()->print_cr("Debugging has not been started: %s", error);
1133 } else {
1134 output()->print_cr(is_first_start ? "Debugging has been started." : "Debugging is already active.");
1135 output()->print_cr("Transport : %s", transport ? transport : "#unknown");
1136 output()->print_cr("Address : %s", addr ? addr : "#unknown");
1137 }
1138 }
1139 #endif // INCLUDE_JVMTI