1 /*
2 * Copyright (c) 2011, 2023, 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 "cds/cds_globals.hpp"
27 #include "classfile/classLoaderHierarchyDCmd.hpp"
28 #include "classfile/classLoaderStats.hpp"
29 #include "classfile/classLoaderDataGraph.hpp"
30 #include "classfile/javaClasses.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmClasses.hpp"
33 #include "code/codeCache.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "compiler/directivesParser.hpp"
36 #include "gc/shared/gcVMOperations.hpp"
37 #include "jvm.h"
38 #include "memory/metaspace/metaspaceDCmd.hpp"
39 #include "memory/resourceArea.hpp"
40 #include "memory/universe.hpp"
41 #include "oops/instanceKlass.hpp"
42 #include "oops/objArrayOop.inline.hpp"
43 #include "oops/oop.inline.hpp"
44 #include "oops/typeArrayOop.inline.hpp"
45 #include "prims/jvmtiAgentList.hpp"
46 #include "runtime/fieldDescriptor.inline.hpp"
47 #include "runtime/flags/jvmFlag.hpp"
48 #include "runtime/handles.inline.hpp"
49 #include "runtime/interfaceSupport.inline.hpp"
50 #include "runtime/javaCalls.hpp"
51 #include "runtime/jniHandles.hpp"
52 #include "runtime/os.hpp"
53 #include "runtime/vmOperations.hpp"
54 #include "runtime/vm_version.hpp"
55 #include "services/diagnosticArgument.hpp"
56 #include "services/diagnosticCommand.hpp"
57 #include "services/diagnosticFramework.hpp"
58 #include "services/heapDumper.hpp"
59 #include "services/management.hpp"
60 #include "services/nmtDCmd.hpp"
61 #include "services/writeableFlags.hpp"
62 #include "utilities/debug.hpp"
63 #include "utilities/events.hpp"
64 #include "utilities/formatBuffer.hpp"
65 #include "utilities/macros.hpp"
66 #ifdef LINUX
67 #include "trimCHeapDCmd.hpp"
68 #include "mallocInfoDcmd.hpp"
69 #endif
70
71 static void loadAgentModule(TRAPS) {
72 ResourceMark rm(THREAD);
73 HandleMark hm(THREAD);
74
75 JavaValue result(T_OBJECT);
76 Handle h_module_name = java_lang_String::create_from_str("jdk.management.agent", CHECK);
77 JavaCalls::call_static(&result,
78 vmClasses::module_Modules_klass(),
79 vmSymbols::loadModule_name(),
80 vmSymbols::loadModule_signature(),
81 h_module_name,
82 THREAD);
83 }
84
85 void DCmd::register_dcmds(){
86 // Registration of the diagnostic commands
87 // First argument specifies which interfaces will export the command
88 // Second argument specifies if the command is enabled
89 // Third argument specifies if the command is hidden
90 uint32_t full_export = DCmd_Source_Internal | DCmd_Source_AttachAPI
91 | DCmd_Source_MBean;
92 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<HelpDCmd>(full_export, true, false));
93 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<VersionDCmd>(full_export, true, false));
94 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CommandLineDCmd>(full_export, true, false));
95 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<PrintSystemPropertiesDCmd>(full_export, true, false));
96 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<PrintVMFlagsDCmd>(full_export, true, false));
97 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<SetVMFlagDCmd>(full_export, true, false));
98 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<VMDynamicLibrariesDCmd>(full_export, true, false));
99 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<VMUptimeDCmd>(full_export, true, false));
100 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<VMInfoDCmd>(full_export, true, false));
101 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<SystemGCDCmd>(full_export, true, false));
102 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<RunFinalizationDCmd>(full_export, true, false));
103 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<HeapInfoDCmd>(full_export, true, false));
104 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<FinalizerInfoDCmd>(full_export, true, false));
105 #if INCLUDE_SERVICES
106 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<HeapDumpDCmd>(DCmd_Source_Internal | DCmd_Source_AttachAPI, true, false));
107 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<ClassHistogramDCmd>(full_export, true, false));
108 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<SystemDictionaryDCmd>(full_export, true, false));
109 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<ClassHierarchyDCmd>(full_export, true, false));
110 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<ClassesDCmd>(full_export, true, false));
111 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<SymboltableDCmd>(full_export, true, false));
112 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<StringtableDCmd>(full_export, true, false));
113 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<metaspace::MetaspaceDCmd>(full_export, true, false));
114 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<PrintClassLayoutDCmd>(full_export, true, false));
115 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<EventLogDCmd>(full_export, true, false));
116 #if INCLUDE_JVMTI // Both JVMTI and SERVICES have to be enabled to have this dcmd
117 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JVMTIAgentLoadDCmd>(full_export, true, false));
118 #endif // INCLUDE_JVMTI
119 #endif // INCLUDE_SERVICES
120 #if INCLUDE_JVMTI
121 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JVMTIDataDumpDCmd>(full_export, true, false));
122 #endif // INCLUDE_JVMTI
123 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<ThreadDumpDCmd>(full_export, true, false));
124 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<ThreadDumpToFileDCmd>(full_export, true, false));
125 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<ClassLoaderStatsDCmd>(full_export, true, false));
126 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<ClassLoaderHierarchyDCmd>(full_export, true, false));
127 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CompileQueueDCmd>(full_export, true, false));
128 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CodeListDCmd>(full_export, true, false));
129 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CodeCacheDCmd>(full_export, true, false));
130 #ifdef LINUX
131 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<PerfMapDCmd>(full_export, true, false));
132 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<TrimCLibcHeapDCmd>(full_export, true, false));
133 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<MallocInfoDcmd>(full_export, true, false));
134 #endif // LINUX
135 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CodeHeapAnalyticsDCmd>(full_export, true, false));
136
137 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CompilerDirectivesPrintDCmd>(full_export, true, false));
138 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CompilerDirectivesAddDCmd>(full_export, true, false));
139 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CompilerDirectivesRemoveDCmd>(full_export, true, false));
140 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CompilerDirectivesClearDCmd>(full_export, true, false));
141
142 // Enhanced JMX Agent Support
143 // These commands won't be exported via the DiagnosticCommandMBean until an
144 // appropriate permission is created for them
145 uint32_t jmx_agent_export_flags = DCmd_Source_Internal | DCmd_Source_AttachAPI;
146 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JMXStartRemoteDCmd>(jmx_agent_export_flags, true,false));
147 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JMXStartLocalDCmd>(jmx_agent_export_flags, true,false));
148 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JMXStopRemoteDCmd>(jmx_agent_export_flags, true,false));
149 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JMXStatusDCmd>(jmx_agent_export_flags, true,false));
150 // Debug on cmd (only makes sense with JVMTI since the agentlib needs it).
151 #if INCLUDE_JVMTI
152 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<DebugOnCmdStartDCmd>(full_export, true, true));
153 #endif // INCLUDE_JVMTI
154
155 #if INCLUDE_CDS
156 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<DumpSharedArchiveDCmd>(full_export, true, false));
157 #endif // INCLUDE_CDS
158
159 DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<NMTDCmd>(full_export, true, false));
160 }
161
162 HelpDCmd::HelpDCmd(outputStream* output, bool heap) : DCmdWithParser(output, heap),
163 _all("-all", "Show help for all commands", "BOOLEAN", false, "false"),
164 _cmd("command name", "The name of the command for which we want help",
165 "STRING", false) {
166 _dcmdparser.add_dcmd_option(&_all);
167 _dcmdparser.add_dcmd_argument(&_cmd);
168 };
169
170
171 static int compare_strings(const char** s1, const char** s2) {
172 return ::strcmp(*s1, *s2);
173 }
174
175 void HelpDCmd::execute(DCmdSource source, TRAPS) {
176 if (_all.value()) {
177 GrowableArray<const char*>* cmd_list = DCmdFactory::DCmd_list(source);
178 cmd_list->sort(compare_strings);
179 for (int i = 0; i < cmd_list->length(); i++) {
180 DCmdFactory* factory = DCmdFactory::factory(source, cmd_list->at(i),
181 strlen(cmd_list->at(i)));
182 output()->print_cr("%s%s", factory->name(),
183 factory->is_enabled() ? "" : " [disabled]");
184 output()->print_cr("\t%s", factory->description());
185 output()->cr();
186 factory = factory->next();
187 }
188 } else if (_cmd.has_value()) {
189 DCmd* cmd = nullptr;
190 DCmdFactory* factory = DCmdFactory::factory(source, _cmd.value(),
191 strlen(_cmd.value()));
192 if (factory != nullptr) {
193 output()->print_cr("%s%s", factory->name(),
194 factory->is_enabled() ? "" : " [disabled]");
195 output()->print_cr("%s", factory->description());
196 output()->print_cr("\nImpact: %s", factory->impact());
197 output()->cr();
198 cmd = factory->create_resource_instance(output());
199 if (cmd != nullptr) {
200 DCmdMark mark(cmd);
201 cmd->print_help(factory->name());
202 }
203 } else {
204 output()->print_cr("Help unavailable : '%s' : No such command", _cmd.value());
205 }
206 } else {
207 output()->print_cr("The following commands are available:");
208 GrowableArray<const char *>* cmd_list = DCmdFactory::DCmd_list(source);
209 cmd_list->sort(compare_strings);
210 for (int i = 0; i < cmd_list->length(); i++) {
211 DCmdFactory* factory = DCmdFactory::factory(source, cmd_list->at(i),
212 strlen(cmd_list->at(i)));
213 output()->print_cr("%s%s", factory->name(),
214 factory->is_enabled() ? "" : " [disabled]");
215 factory = factory->_next;
216 }
217 output()->print_cr("\nFor more information about a specific command use 'help <command>'.");
218 }
219 }
220
221 void VersionDCmd::execute(DCmdSource source, TRAPS) {
222 output()->print_cr("%s version %s", VM_Version::vm_name(),
223 VM_Version::vm_release());
224 JDK_Version jdk_version = JDK_Version::current();
225 if (jdk_version.patch_version() > 0) {
226 output()->print_cr("JDK %d.%d.%d.%d", jdk_version.major_version(),
227 jdk_version.minor_version(), jdk_version.security_version(),
228 jdk_version.patch_version());
229 } else {
230 output()->print_cr("JDK %d.%d.%d", jdk_version.major_version(),
231 jdk_version.minor_version(), jdk_version.security_version());
232 }
233 }
234
235 PrintVMFlagsDCmd::PrintVMFlagsDCmd(outputStream* output, bool heap) :
236 DCmdWithParser(output, heap),
237 _all("-all", "Print all flags supported by the VM", "BOOLEAN", false, "false") {
238 _dcmdparser.add_dcmd_option(&_all);
239 }
240
241 void PrintVMFlagsDCmd::execute(DCmdSource source, TRAPS) {
242 if (_all.value()) {
243 JVMFlag::printFlags(output(), true);
244 } else {
245 JVMFlag::printSetFlags(output());
246 }
247 }
248
249 SetVMFlagDCmd::SetVMFlagDCmd(outputStream* output, bool heap) :
250 DCmdWithParser(output, heap),
251 _flag("flag name", "The name of the flag we want to set",
252 "STRING", true),
253 _value("string value", "The value we want to set", "STRING", false) {
254 _dcmdparser.add_dcmd_argument(&_flag);
255 _dcmdparser.add_dcmd_argument(&_value);
256 }
257
258 void SetVMFlagDCmd::execute(DCmdSource source, TRAPS) {
259 const char* val = nullptr;
260 if (_value.value() != nullptr) {
261 val = _value.value();
262 }
263
264 FormatBuffer<80> err_msg("%s", "");
265 int ret = WriteableFlags::set_flag(_flag.value(), val, JVMFlagOrigin::MANAGEMENT, err_msg);
266
267 if (ret != JVMFlag::SUCCESS) {
268 output()->print_cr("%s", err_msg.buffer());
269 }
270 }
271
272 void JVMTIDataDumpDCmd::execute(DCmdSource source, TRAPS) {
273 if (JvmtiExport::should_post_data_dump()) {
274 JvmtiExport::post_data_dump();
275 }
276 }
277
278 #if INCLUDE_SERVICES
279 #if INCLUDE_JVMTI
280 JVMTIAgentLoadDCmd::JVMTIAgentLoadDCmd(outputStream* output, bool heap) :
281 DCmdWithParser(output, heap),
282 _libpath("library path", "Absolute path of the JVMTI agent to load.",
283 "STRING", true),
284 _option("agent option", "Option string to pass the agent.", "STRING", false) {
285 _dcmdparser.add_dcmd_argument(&_libpath);
286 _dcmdparser.add_dcmd_argument(&_option);
287 }
288
289 void JVMTIAgentLoadDCmd::execute(DCmdSource source, TRAPS) {
290
291 if (_libpath.value() == nullptr) {
292 output()->print_cr("JVMTI.agent_load dcmd needs library path.");
293 return;
294 }
295
296 char *suffix = strrchr(_libpath.value(), '.');
297 bool is_java_agent = (suffix != nullptr) && (strncmp(".jar", suffix, 4) == 0);
298
299 if (is_java_agent) {
300 if (_option.value() == nullptr) {
301 JvmtiAgentList::load_agent("instrument", "false", _libpath.value(), output());
302 } else {
303 size_t opt_len = strlen(_libpath.value()) + strlen(_option.value()) + 2;
304 if (opt_len > 4096) {
305 output()->print_cr("JVMTI agent attach failed: Options is too long.");
306 return;
307 }
308
309 char *opt = (char *)os::malloc(opt_len, mtInternal);
310 if (opt == nullptr) {
311 output()->print_cr("JVMTI agent attach failed: "
312 "Could not allocate " SIZE_FORMAT " bytes for argument.",
313 opt_len);
314 return;
315 }
316
317 jio_snprintf(opt, opt_len, "%s=%s", _libpath.value(), _option.value());
318 JvmtiAgentList::load_agent("instrument", "false", opt, output());
319
320 os::free(opt);
321 }
322 } else {
323 JvmtiAgentList::load_agent(_libpath.value(), "true", _option.value(), output());
324 }
325 }
326
327 #endif // INCLUDE_JVMTI
328 #endif // INCLUDE_SERVICES
329
330 void PrintSystemPropertiesDCmd::execute(DCmdSource source, TRAPS) {
331 // load VMSupport
332 Symbol* klass = vmSymbols::jdk_internal_vm_VMSupport();
333 Klass* k = SystemDictionary::resolve_or_fail(klass, true, CHECK);
334 InstanceKlass* ik = InstanceKlass::cast(k);
335 if (ik->should_be_initialized()) {
336 ik->initialize(THREAD);
337 }
338 if (HAS_PENDING_EXCEPTION) {
339 java_lang_Throwable::print(PENDING_EXCEPTION, output());
340 output()->cr();
341 CLEAR_PENDING_EXCEPTION;
342 return;
343 }
344
345 // invoke the serializePropertiesToByteArray method
346 JavaValue result(T_OBJECT);
347 JavaCallArguments args;
348
349 Symbol* signature = vmSymbols::void_byte_array_signature();
350 JavaCalls::call_static(&result,
351 ik,
352 vmSymbols::serializePropertiesToByteArray_name(),
353 signature,
354 &args,
355 THREAD);
356 if (HAS_PENDING_EXCEPTION) {
357 java_lang_Throwable::print(PENDING_EXCEPTION, output());
358 output()->cr();
359 CLEAR_PENDING_EXCEPTION;
360 return;
361 }
362
363 // The result should be a [B
364 oop res = result.get_oop();
365 assert(res->is_typeArray(), "just checking");
366 assert(TypeArrayKlass::cast(res->klass())->element_type() == T_BYTE, "just checking");
367
368 // copy the bytes to the output stream
369 typeArrayOop ba = typeArrayOop(res);
370 jbyte* addr = typeArrayOop(res)->byte_at_addr(0);
371 output()->print_raw((const char*)addr, ba->length());
372 }
373
374 VMUptimeDCmd::VMUptimeDCmd(outputStream* output, bool heap) :
375 DCmdWithParser(output, heap),
376 _date("-date", "Add a prefix with current date", "BOOLEAN", false, "false") {
377 _dcmdparser.add_dcmd_option(&_date);
378 }
379
380 void VMUptimeDCmd::execute(DCmdSource source, TRAPS) {
381 if (_date.value()) {
382 output()->date_stamp(true, "", ": ");
383 }
384 output()->time_stamp().update_to(tty->time_stamp().ticks());
385 output()->stamp();
386 output()->print_cr(" s");
387 }
388
389 void VMInfoDCmd::execute(DCmdSource source, TRAPS) {
390 VMError::print_vm_info(_output);
391 }
392
393 void SystemGCDCmd::execute(DCmdSource source, TRAPS) {
394 Universe::heap()->collect(GCCause::_dcmd_gc_run);
395 }
396
397 void RunFinalizationDCmd::execute(DCmdSource source, TRAPS) {
398 Klass* k = vmClasses::System_klass();
399 JavaValue result(T_VOID);
400 JavaCalls::call_static(&result, k,
401 vmSymbols::run_finalization_name(),
402 vmSymbols::void_method_signature(), CHECK);
403 }
404
405 void HeapInfoDCmd::execute(DCmdSource source, TRAPS) {
406 MutexLocker hl(THREAD, Heap_lock);
407 Universe::heap()->print_on(output());
408 }
409
410 void FinalizerInfoDCmd::execute(DCmdSource source, TRAPS) {
411 ResourceMark rm(THREAD);
412
413 if (!InstanceKlass::is_finalization_enabled()) {
414 output()->print_cr("Finalization is disabled");
415 return;
416 }
417
418 Klass* k = SystemDictionary::resolve_or_fail(
419 vmSymbols::finalizer_histogram_klass(), true, CHECK);
420
421 JavaValue result(T_ARRAY);
422
423 // We are calling lang.ref.FinalizerHistogram.getFinalizerHistogram() method
424 // and expect it to return array of FinalizerHistogramEntry as Object[]
425
426 JavaCalls::call_static(&result, k,
427 vmSymbols::get_finalizer_histogram_name(),
428 vmSymbols::void_finalizer_histogram_entry_array_signature(), CHECK);
429
430 objArrayOop result_oop = (objArrayOop) result.get_oop();
431 if (result_oop->length() == 0) {
432 output()->print_cr("No instances waiting for finalization found");
433 return;
434 }
435
436 oop foop = result_oop->obj_at(0);
437 InstanceKlass* ik = InstanceKlass::cast(foop->klass());
438
439 fieldDescriptor count_fd, name_fd;
440
441 Klass* count_res = ik->find_field(
442 vmSymbols::finalizer_histogram_entry_count_field(), vmSymbols::int_signature(), &count_fd);
443
444 Klass* name_res = ik->find_field(
445 vmSymbols::finalizer_histogram_entry_name_field(), vmSymbols::string_signature(), &name_fd);
446
447 assert(count_res != nullptr && name_res != nullptr, "Unexpected layout of FinalizerHistogramEntry");
448
449 output()->print_cr("Unreachable instances waiting for finalization");
450 output()->print_cr("#instances class name");
451 output()->print_cr("-----------------------");
452
453 for (int i = 0; i < result_oop->length(); ++i) {
454 oop element_oop = result_oop->obj_at(i);
455 oop str_oop = element_oop->obj_field(name_fd.offset());
456 char *name = java_lang_String::as_utf8_string(str_oop);
457 int count = element_oop->int_field(count_fd.offset());
458 output()->print_cr("%10d %s", count, name);
459 }
460 }
461
462 #if INCLUDE_SERVICES // Heap dumping/inspection supported
463 HeapDumpDCmd::HeapDumpDCmd(outputStream* output, bool heap) :
464 DCmdWithParser(output, heap),
465 _filename("filename","Name of the dump file", "STRING",true),
466 _all("-all", "Dump all objects, including unreachable objects",
467 "BOOLEAN", false, "false"),
468 _gzip("-gz", "If specified, the heap dump is written in gzipped format "
469 "using the given compression level. 1 (recommended) is the fastest, "
470 "9 the strongest compression.", "INT", false, "1"),
471 _overwrite("-overwrite", "If specified, the dump file will be overwritten if it exists",
472 "BOOLEAN", false, "false") {
473 _dcmdparser.add_dcmd_option(&_all);
474 _dcmdparser.add_dcmd_argument(&_filename);
475 _dcmdparser.add_dcmd_option(&_gzip);
476 _dcmdparser.add_dcmd_option(&_overwrite);
477 }
478
479 void HeapDumpDCmd::execute(DCmdSource source, TRAPS) {
480 jlong level = -1; // -1 means no compression.
481
482 if (_gzip.is_set()) {
483 level = _gzip.value();
484
485 if (level < 1 || level > 9) {
486 output()->print_cr("Compression level out of range (1-9): " JLONG_FORMAT, level);
487 return;
488 }
489 }
490
491 // Request a full GC before heap dump if _all is false
492 // This helps reduces the amount of unreachable objects in the dump
493 // and makes it easier to browse.
494 HeapDumper dumper(!_all.value() /* request GC if _all is false*/);
495 dumper.dump(_filename.value(), output(), (int) level, _overwrite.value());
496 }
497
498 ClassHistogramDCmd::ClassHistogramDCmd(outputStream* output, bool heap) :
499 DCmdWithParser(output, heap),
500 _all("-all", "Inspect all objects, including unreachable objects",
501 "BOOLEAN", false, "false"),
502 _parallel_thread_num("-parallel",
503 "Number of parallel threads to use for heap inspection. "
504 "0 (the default) means let the VM determine the number of threads to use. "
505 "1 means use one thread (disable parallelism). "
506 "For any other value the VM will try to use the specified number of "
507 "threads, but might use fewer.",
508 "INT", false, "0") {
509 _dcmdparser.add_dcmd_option(&_all);
510 _dcmdparser.add_dcmd_option(&_parallel_thread_num);
511 }
512
513 void ClassHistogramDCmd::execute(DCmdSource source, TRAPS) {
514 jlong num = _parallel_thread_num.value();
515 if (num < 0) {
516 output()->print_cr("Parallel thread number out of range (>=0): " JLONG_FORMAT, num);
517 return;
518 }
519 uint parallel_thread_num = num == 0
520 ? MAX2<uint>(1, (uint)os::initial_active_processor_count() * 3 / 8)
521 : num;
522 VM_GC_HeapInspection heapop(output(),
523 !_all.value(), /* request full gc if false */
524 parallel_thread_num);
525 VMThread::execute(&heapop);
526 }
527
528 #endif // INCLUDE_SERVICES
529
530 ThreadDumpDCmd::ThreadDumpDCmd(outputStream* output, bool heap) :
531 DCmdWithParser(output, heap),
532 _locks("-l", "print java.util.concurrent locks", "BOOLEAN", false, "false"),
533 _extended("-e", "print extended thread information", "BOOLEAN", false, "false") {
534 _dcmdparser.add_dcmd_option(&_locks);
535 _dcmdparser.add_dcmd_option(&_extended);
536 }
537
538 void ThreadDumpDCmd::execute(DCmdSource source, TRAPS) {
539 // thread stacks and JNI global handles
540 VM_PrintThreads op1(output(), _locks.value(), _extended.value(), true /* print JNI handle info */);
541 VMThread::execute(&op1);
542
543 // Deadlock detection
544 VM_FindDeadlocks op2(output());
545 VMThread::execute(&op2);
546 }
547
548 // Enhanced JMX Agent support
549
550 JMXStartRemoteDCmd::JMXStartRemoteDCmd(outputStream *output, bool heap_allocated) :
551
552 DCmdWithParser(output, heap_allocated),
553
554 _config_file
555 ("config.file",
556 "set com.sun.management.config.file", "STRING", false),
557
558 _jmxremote_host
559 ("jmxremote.host",
560 "set com.sun.management.jmxremote.host", "STRING", false),
561
562 _jmxremote_port
563 ("jmxremote.port",
564 "set com.sun.management.jmxremote.port", "STRING", false),
565
566 _jmxremote_rmi_port
567 ("jmxremote.rmi.port",
568 "set com.sun.management.jmxremote.rmi.port", "STRING", false),
569
570 _jmxremote_ssl
571 ("jmxremote.ssl",
572 "set com.sun.management.jmxremote.ssl", "STRING", false),
573
574 _jmxremote_registry_ssl
575 ("jmxremote.registry.ssl",
576 "set com.sun.management.jmxremote.registry.ssl", "STRING", false),
577
578 _jmxremote_authenticate
579 ("jmxremote.authenticate",
580 "set com.sun.management.jmxremote.authenticate", "STRING", false),
581
582 _jmxremote_password_file
583 ("jmxremote.password.file",
584 "set com.sun.management.jmxremote.password.file", "STRING", false),
585
586 _jmxremote_access_file
587 ("jmxremote.access.file",
588 "set com.sun.management.jmxremote.access.file", "STRING", false),
589
590 _jmxremote_login_config
591 ("jmxremote.login.config",
592 "set com.sun.management.jmxremote.login.config", "STRING", false),
593
594 _jmxremote_ssl_enabled_cipher_suites
595 ("jmxremote.ssl.enabled.cipher.suites",
596 "set com.sun.management.jmxremote.ssl.enabled.cipher.suite", "STRING", false),
597
598 _jmxremote_ssl_enabled_protocols
599 ("jmxremote.ssl.enabled.protocols",
600 "set com.sun.management.jmxremote.ssl.enabled.protocols", "STRING", false),
601
602 _jmxremote_ssl_need_client_auth
603 ("jmxremote.ssl.need.client.auth",
604 "set com.sun.management.jmxremote.need.client.auth", "STRING", false),
605
606 _jmxremote_ssl_config_file
607 ("jmxremote.ssl.config.file",
608 "set com.sun.management.jmxremote.ssl.config.file", "STRING", false),
609
610 // JDP Protocol support
611 _jmxremote_autodiscovery
612 ("jmxremote.autodiscovery",
613 "set com.sun.management.jmxremote.autodiscovery", "STRING", false),
614
615 _jdp_port
616 ("jdp.port",
617 "set com.sun.management.jdp.port", "INT", false),
618
619 _jdp_address
620 ("jdp.address",
621 "set com.sun.management.jdp.address", "STRING", false),
622
623 _jdp_source_addr
624 ("jdp.source_addr",
625 "set com.sun.management.jdp.source_addr", "STRING", false),
626
627 _jdp_ttl
628 ("jdp.ttl",
629 "set com.sun.management.jdp.ttl", "INT", false),
630
631 _jdp_pause
632 ("jdp.pause",
633 "set com.sun.management.jdp.pause", "INT", false),
634
635 _jdp_name
636 ("jdp.name",
637 "set com.sun.management.jdp.name", "STRING", false)
638
639 {
640 _dcmdparser.add_dcmd_option(&_config_file);
641 _dcmdparser.add_dcmd_option(&_jmxremote_host);
642 _dcmdparser.add_dcmd_option(&_jmxremote_port);
643 _dcmdparser.add_dcmd_option(&_jmxremote_rmi_port);
644 _dcmdparser.add_dcmd_option(&_jmxremote_ssl);
645 _dcmdparser.add_dcmd_option(&_jmxremote_registry_ssl);
646 _dcmdparser.add_dcmd_option(&_jmxremote_authenticate);
647 _dcmdparser.add_dcmd_option(&_jmxremote_password_file);
648 _dcmdparser.add_dcmd_option(&_jmxremote_access_file);
649 _dcmdparser.add_dcmd_option(&_jmxremote_login_config);
650 _dcmdparser.add_dcmd_option(&_jmxremote_ssl_enabled_cipher_suites);
651 _dcmdparser.add_dcmd_option(&_jmxremote_ssl_enabled_protocols);
652 _dcmdparser.add_dcmd_option(&_jmxremote_ssl_need_client_auth);
653 _dcmdparser.add_dcmd_option(&_jmxremote_ssl_config_file);
654 _dcmdparser.add_dcmd_option(&_jmxremote_autodiscovery);
655 _dcmdparser.add_dcmd_option(&_jdp_port);
656 _dcmdparser.add_dcmd_option(&_jdp_address);
657 _dcmdparser.add_dcmd_option(&_jdp_source_addr);
658 _dcmdparser.add_dcmd_option(&_jdp_ttl);
659 _dcmdparser.add_dcmd_option(&_jdp_pause);
660 _dcmdparser.add_dcmd_option(&_jdp_name);
661 }
662
663 void JMXStartRemoteDCmd::execute(DCmdSource source, TRAPS) {
664 ResourceMark rm(THREAD);
665 HandleMark hm(THREAD);
666
667 // Load and initialize the jdk.internal.agent.Agent class
668 // invoke startRemoteManagementAgent(string) method to start
669 // the remote management server.
670 // throw java.lang.NoSuchMethodError if the method doesn't exist
671
672 loadAgentModule(CHECK);
673 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
674 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::jdk_internal_agent_Agent(), loader, Handle(), true, CHECK);
675
676 JavaValue result(T_VOID);
677
678 // Pass all command line arguments to java as key=value,...
679 // All checks are done on java side
680
681 int len = 0;
682 stringStream options;
683 char comma[2] = {0,0};
684
685 // Leave default values on Agent.class side and pass only
686 // arguments explicitly set by user. All arguments passed
687 // to jcmd override properties with the same name set by
688 // command line with -D or by managmenent.properties
689 // file.
690 #define PUT_OPTION(a) \
691 do { \
692 if ( (a).is_set() ){ \
693 if ( *((a).type()) == 'I' ) { \
694 options.print("%scom.sun.management.%s=" JLONG_FORMAT, comma, (a).name(), (jlong)((a).value())); \
695 } else { \
696 options.print("%scom.sun.management.%s=%s", comma, (a).name(), (char*)((a).value())); \
697 } \
698 comma[0] = ','; \
699 }\
700 } while(0);
701
702
703 PUT_OPTION(_config_file);
704 PUT_OPTION(_jmxremote_host);
705 PUT_OPTION(_jmxremote_port);
706 PUT_OPTION(_jmxremote_rmi_port);
707 PUT_OPTION(_jmxremote_ssl);
708 PUT_OPTION(_jmxremote_registry_ssl);
709 PUT_OPTION(_jmxremote_authenticate);
710 PUT_OPTION(_jmxremote_password_file);
711 PUT_OPTION(_jmxremote_access_file);
712 PUT_OPTION(_jmxremote_login_config);
713 PUT_OPTION(_jmxremote_ssl_enabled_cipher_suites);
714 PUT_OPTION(_jmxremote_ssl_enabled_protocols);
715 PUT_OPTION(_jmxremote_ssl_need_client_auth);
716 PUT_OPTION(_jmxremote_ssl_config_file);
717 PUT_OPTION(_jmxremote_autodiscovery);
718 PUT_OPTION(_jdp_port);
719 PUT_OPTION(_jdp_address);
720 PUT_OPTION(_jdp_source_addr);
721 PUT_OPTION(_jdp_ttl);
722 PUT_OPTION(_jdp_pause);
723 PUT_OPTION(_jdp_name);
724
725 #undef PUT_OPTION
726
727 Handle str = java_lang_String::create_from_str(options.as_string(), CHECK);
728 JavaCalls::call_static(&result, k, vmSymbols::startRemoteAgent_name(), vmSymbols::string_void_signature(), str, CHECK);
729 }
730
731 JMXStartLocalDCmd::JMXStartLocalDCmd(outputStream *output, bool heap_allocated) :
732 DCmd(output, heap_allocated) {
733 // do nothing
734 }
735
736 void JMXStartLocalDCmd::execute(DCmdSource source, TRAPS) {
737 ResourceMark rm(THREAD);
738 HandleMark hm(THREAD);
739
740 // Load and initialize the jdk.internal.agent.Agent class
741 // invoke startLocalManagementAgent(void) method to start
742 // the local management server
743 // throw java.lang.NoSuchMethodError if method doesn't exist
744
745 loadAgentModule(CHECK);
746 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
747 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::jdk_internal_agent_Agent(), loader, Handle(), true, CHECK);
748
749 JavaValue result(T_VOID);
750 JavaCalls::call_static(&result, k, vmSymbols::startLocalAgent_name(), vmSymbols::void_method_signature(), CHECK);
751 }
752
753 void JMXStopRemoteDCmd::execute(DCmdSource source, TRAPS) {
754 ResourceMark rm(THREAD);
755 HandleMark hm(THREAD);
756
757 // Load and initialize the jdk.internal.agent.Agent class
758 // invoke stopRemoteManagementAgent method to stop the
759 // management server
760 // throw java.lang.NoSuchMethodError if method doesn't exist
761
762 loadAgentModule(CHECK);
763 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
764 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::jdk_internal_agent_Agent(), loader, Handle(), true, CHECK);
765
766 JavaValue result(T_VOID);
767 JavaCalls::call_static(&result, k, vmSymbols::stopRemoteAgent_name(), vmSymbols::void_method_signature(), CHECK);
768 }
769
770 JMXStatusDCmd::JMXStatusDCmd(outputStream *output, bool heap_allocated) :
771 DCmd(output, heap_allocated) {
772 // do nothing
773 }
774
775 void JMXStatusDCmd::execute(DCmdSource source, TRAPS) {
776 ResourceMark rm(THREAD);
777 HandleMark hm(THREAD);
778
779 // Load and initialize the jdk.internal.agent.Agent class
780 // invoke getManagementAgentStatus() method to generate the status info
781 // throw java.lang.NoSuchMethodError if method doesn't exist
782
783 loadAgentModule(CHECK);
784 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
785 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::jdk_internal_agent_Agent(), loader, Handle(), true, CHECK);
786
787 JavaValue result(T_OBJECT);
788 JavaCalls::call_static(&result, k, vmSymbols::getAgentStatus_name(), vmSymbols::void_string_signature(), CHECK);
789
790 jvalue* jv = (jvalue*) result.get_value_addr();
791 oop str = cast_to_oop(jv->l);
792 if (str != nullptr) {
793 char* out = java_lang_String::as_utf8_string(str);
794 if (out) {
795 // Avoid using print_cr() because length maybe longer than O_BUFLEN
796 output()->print_raw_cr(out);
797 return;
798 }
799 }
800 output()->print_cr("Error obtaining management agent status");
801 }
802
803 VMDynamicLibrariesDCmd::VMDynamicLibrariesDCmd(outputStream *output, bool heap_allocated) :
804 DCmd(output, heap_allocated) {
805 // do nothing
806 }
807
808 void VMDynamicLibrariesDCmd::execute(DCmdSource source, TRAPS) {
809 os::print_dll_info(output());
810 output()->cr();
811 }
812
813 void CompileQueueDCmd::execute(DCmdSource source, TRAPS) {
814 VM_PrintCompileQueue printCompileQueueOp(output());
815 VMThread::execute(&printCompileQueueOp);
816 }
817
818 void CodeListDCmd::execute(DCmdSource source, TRAPS) {
819 CodeCache::print_codelist(output());
820 }
821
822 void CodeCacheDCmd::execute(DCmdSource source, TRAPS) {
823 CodeCache::print_layout(output());
824 }
825
826 #ifdef LINUX
827 void PerfMapDCmd::execute(DCmdSource source, TRAPS) {
828 CodeCache::write_perf_map();
829 }
830 #endif // LINUX
831
832 //---< BEGIN >--- CodeHeap State Analytics.
833 CodeHeapAnalyticsDCmd::CodeHeapAnalyticsDCmd(outputStream* output, bool heap) :
834 DCmdWithParser(output, heap),
835 _function("function", "Function to be performed (aggregate, UsedSpace, FreeSpace, MethodCount, MethodSpace, MethodAge, MethodNames, discard", "STRING", false, "all"),
836 _granularity("granularity", "Detail level - smaller value -> more detail", "INT", false, "4096") {
837 _dcmdparser.add_dcmd_argument(&_function);
838 _dcmdparser.add_dcmd_argument(&_granularity);
839 }
840
841 void CodeHeapAnalyticsDCmd::execute(DCmdSource source, TRAPS) {
842 jlong granularity = _granularity.value();
843 if (granularity < 1) {
844 Exceptions::fthrow(THREAD_AND_LOCATION, vmSymbols::java_lang_IllegalArgumentException(),
845 "Invalid granularity value " JLONG_FORMAT ". Should be positive.\n", granularity);
846 return;
847 }
848
849 CompileBroker::print_heapinfo(output(), _function.value(), granularity);
850 }
851 //---< END >--- CodeHeap State Analytics.
852
853 EventLogDCmd::EventLogDCmd(outputStream* output, bool heap) :
854 DCmdWithParser(output, heap),
855 _log("log", "Name of log to be printed. If omitted, all logs are printed.", "STRING", false, nullptr),
856 _max("max", "Maximum number of events to be printed (newest first). If omitted, all events are printed.", "STRING", false, nullptr)
857 {
858 _dcmdparser.add_dcmd_option(&_log);
859 _dcmdparser.add_dcmd_option(&_max);
860 }
861
862 void EventLogDCmd::execute(DCmdSource source, TRAPS) {
863 const char* max_value = _max.value();
864 long max = -1;
865 if (max_value != nullptr) {
866 char* endptr = nullptr;
867 max = ::strtol(max_value, &endptr, 10);
868 if (max == 0 && max_value == endptr) {
869 output()->print_cr("Invalid max option: \"%s\".", max_value);
870 return;
871 }
872 }
873 const char* log_name = _log.value();
874 if (log_name != nullptr) {
875 Events::print_one(output(), log_name, max);
876 } else {
877 Events::print_all(output(), max);
878 }
879 }
880
881 void CompilerDirectivesPrintDCmd::execute(DCmdSource source, TRAPS) {
882 DirectivesStack::print(output());
883 }
884
885 CompilerDirectivesAddDCmd::CompilerDirectivesAddDCmd(outputStream* output, bool heap) :
886 DCmdWithParser(output, heap),
887 _filename("filename","Name of the directives file", "STRING",true) {
888 _dcmdparser.add_dcmd_argument(&_filename);
889 }
890
891 void CompilerDirectivesAddDCmd::execute(DCmdSource source, TRAPS) {
892 DirectivesParser::parse_from_file(_filename.value(), output(), true);
893 }
894
895 void CompilerDirectivesRemoveDCmd::execute(DCmdSource source, TRAPS) {
896 DirectivesStack::pop(1);
897 }
898
899 void CompilerDirectivesClearDCmd::execute(DCmdSource source, TRAPS) {
900 DirectivesStack::clear();
901 }
902 #if INCLUDE_SERVICES
903 ClassHierarchyDCmd::ClassHierarchyDCmd(outputStream* output, bool heap) :
904 DCmdWithParser(output, heap),
905 _print_interfaces("-i", "Inherited interfaces should be printed.", "BOOLEAN", false, "false"),
906 _print_subclasses("-s", "If a classname is specified, print its subclasses "
907 "in addition to its superclasses. Without this option only the "
908 "superclasses will be printed.", "BOOLEAN", false, "false"),
909 _classname("classname", "Name of class whose hierarchy should be printed. "
910 "If not specified, all class hierarchies are printed.",
911 "STRING", false) {
912 _dcmdparser.add_dcmd_option(&_print_interfaces);
913 _dcmdparser.add_dcmd_option(&_print_subclasses);
914 _dcmdparser.add_dcmd_argument(&_classname);
915 }
916
917 void ClassHierarchyDCmd::execute(DCmdSource source, TRAPS) {
918 VM_PrintClassHierarchy printClassHierarchyOp(output(), _print_interfaces.value(),
919 _print_subclasses.value(), _classname.value());
920 VMThread::execute(&printClassHierarchyOp);
921 }
922
923 PrintClassLayoutDCmd::PrintClassLayoutDCmd(outputStream* output, bool heap) :
924 DCmdWithParser(output, heap),
925 _classname("classname", "Name of class whose layout should be printed. ",
926 "STRING", true) {
927 _dcmdparser.add_dcmd_argument(&_classname);
928 }
929
930 void PrintClassLayoutDCmd::execute(DCmdSource source, TRAPS) {
931 VM_PrintClassLayout printClassLayoutOp(output(), _classname.value());
932 VMThread::execute(&printClassLayoutOp);
933 }
934
935 int PrintClassLayoutDCmd::num_arguments() {
936 ResourceMark rm;
937 PrintClassLayoutDCmd* dcmd = new PrintClassLayoutDCmd(nullptr, false);
938 if (dcmd != nullptr) {
939 DCmdMark mark(dcmd);
940 return dcmd->_dcmdparser.num_arguments();
941 } else {
942 return 0;
943 }
944 }
945
946 #endif // INCLUDE_SERVICES
947
948 ClassesDCmd::ClassesDCmd(outputStream* output, bool heap) :
949 DCmdWithParser(output, heap),
950 _verbose("-verbose",
951 "Dump the detailed content of a Java class. "
952 "Some classes are annotated with flags: "
953 "F = has, or inherits, a non-empty finalize method, "
954 "f = has final method, "
955 "W = methods rewritten, "
956 "C = marked with @Contended annotation, "
957 "R = has been redefined, "
958 "S = is shared class",
959 "BOOLEAN", false, "false") {
960 _dcmdparser.add_dcmd_option(&_verbose);
961 }
962
963 class VM_PrintClasses : public VM_Operation {
964 private:
965 outputStream* _out;
966 bool _verbose;
967 public:
968 VM_PrintClasses(outputStream* out, bool verbose) : _out(out), _verbose(verbose) {}
969
970 virtual VMOp_Type type() const { return VMOp_PrintClasses; }
971
972 virtual void doit() {
973 PrintClassClosure closure(_out, _verbose);
974 ClassLoaderDataGraph::classes_do(&closure);
975 }
976 };
977
978 void ClassesDCmd::execute(DCmdSource source, TRAPS) {
979 VM_PrintClasses vmop(output(), _verbose.is_set());
980 VMThread::execute(&vmop);
981 }
982
983 #if INCLUDE_CDS
984 DumpSharedArchiveDCmd::DumpSharedArchiveDCmd(outputStream* output, bool heap) :
985 DCmdWithParser(output, heap),
986 _suboption("subcmd", "static_dump | dynamic_dump", "STRING", true),
987 _filename("filename", "Name of shared archive to be dumped", "STRING", false)
988 {
989 _dcmdparser.add_dcmd_argument(&_suboption);
990 _dcmdparser.add_dcmd_argument(&_filename);
991 }
992
993 void DumpSharedArchiveDCmd::execute(DCmdSource source, TRAPS) {
994 jboolean is_static;
995 const char* scmd = _suboption.value();
996 const char* file = _filename.value();
997
998 if (strcmp(scmd, "static_dump") == 0) {
999 is_static = JNI_TRUE;
1000 output()->print("Static dump: ");
1001 } else if (strcmp(scmd, "dynamic_dump") == 0) {
1002 is_static = JNI_FALSE;
1003 output()->print("Dynamic dump: ");
1004 if (!UseSharedSpaces) {
1005 output()->print_cr("Dynamic dump is unsupported when base CDS archive is not loaded");
1006 return;
1007 }
1008 if (!RecordDynamicDumpInfo) {
1009 output()->print_cr("Dump dynamic should run with -XX:+RecordDynamicDumpInfo");
1010 return;
1011 }
1012 } else {
1013 output()->print_cr("Invalid command for VM.cds, valid input is static_dump or dynamic_dump");
1014 return;
1015 }
1016
1017 // call CDS.dumpSharedArchive
1018 Handle fileh;
1019 if (file != nullptr) {
1020 fileh = java_lang_String::create_from_str(_filename.value(), CHECK);
1021 }
1022 Symbol* cds_name = vmSymbols::jdk_internal_misc_CDS();
1023 Klass* cds_klass = SystemDictionary::resolve_or_fail(cds_name, true /*throw error*/, CHECK);
1024 JavaValue result(T_OBJECT);
1025 JavaCallArguments args;
1026 args.push_int(is_static);
1027 args.push_oop(fileh);
1028 JavaCalls::call_static(&result,
1029 cds_klass,
1030 vmSymbols::dumpSharedArchive(),
1031 vmSymbols::dumpSharedArchive_signature(),
1032 &args, CHECK);
1033 if (!HAS_PENDING_EXCEPTION) {
1034 assert(result.get_type() == T_OBJECT, "Sanity check");
1035 // result contains the archive name
1036 char* archive_name = java_lang_String::as_utf8_string(result.get_oop());
1037 output()->print_cr("%s", archive_name);
1038 }
1039 }
1040 #endif // INCLUDE_CDS
1041
1042 #if INCLUDE_JVMTI
1043 extern "C" typedef char const* (JNICALL *debugInit_startDebuggingViaCommandPtr)(JNIEnv* env, jthread thread, char const** transport_name,
1044 char const** address, jboolean* first_start);
1045 static debugInit_startDebuggingViaCommandPtr dvc_start_ptr = nullptr;
1046
1047 void DebugOnCmdStartDCmd::execute(DCmdSource source, TRAPS) {
1048 char const* transport = nullptr;
1049 char const* addr = nullptr;
1050 jboolean is_first_start = JNI_FALSE;
1051 JavaThread* thread = THREAD;
1052 jthread jt = JNIHandles::make_local(thread->threadObj());
1053 ThreadToNativeFromVM ttn(thread);
1054 const char *error = "Could not find jdwp agent.";
1055
1056 if (!dvc_start_ptr) {
1057 JvmtiAgentList::Iterator it = JvmtiAgentList::agents();
1058 while (it.has_next()) {
1059 JvmtiAgent* agent = it.next();
1060 if ((strcmp("jdwp", agent->name()) == 0) && (dvc_start_ptr == nullptr)) {
1061 char const* func = "debugInit_startDebuggingViaCommand";
1062 dvc_start_ptr = (debugInit_startDebuggingViaCommandPtr) os::find_agent_function(agent, false, &func, 1);
1063 }
1064 }
1065 }
1066
1067 if (dvc_start_ptr) {
1068 error = dvc_start_ptr(thread->jni_environment(), jt, &transport, &addr, &is_first_start);
1069 }
1070
1071 if (error != nullptr) {
1072 output()->print_cr("Debugging has not been started: %s", error);
1073 } else {
1074 output()->print_cr(is_first_start ? "Debugging has been started." : "Debugging is already active.");
1075 output()->print_cr("Transport : %s", transport ? transport : "#unknown");
1076 output()->print_cr("Address : %s", addr ? addr : "#unknown");
1077 }
1078 }
1079 #endif // INCLUDE_JVMTI
1080
1081 ThreadDumpToFileDCmd::ThreadDumpToFileDCmd(outputStream* output, bool heap) :
1082 DCmdWithParser(output, heap),
1083 _overwrite("-overwrite", "May overwrite existing file", "BOOLEAN", false, "false"),
1084 _format("-format", "Output format (\"plain\" or \"json\")", "STRING", false, "plain"),
1085 _filepath("filepath", "The file path to the output file", "STRING", true) {
1086 _dcmdparser.add_dcmd_option(&_overwrite);
1087 _dcmdparser.add_dcmd_option(&_format);
1088 _dcmdparser.add_dcmd_argument(&_filepath);
1089 }
1090
1091 void ThreadDumpToFileDCmd::execute(DCmdSource source, TRAPS) {
1092 bool json = (_format.value() != nullptr) && (strcmp(_format.value(), "json") == 0);
1093 char* path = _filepath.value();
1094 bool overwrite = _overwrite.value();
1095 Symbol* name = (json) ? vmSymbols::dumpThreadsToJson_name() : vmSymbols::dumpThreads_name();
1096 dumpToFile(name, vmSymbols::string_bool_byte_array_signature(), path, overwrite, CHECK);
1097 }
1098
1099 void ThreadDumpToFileDCmd::dumpToFile(Symbol* name, Symbol* signature, const char* path, bool overwrite, TRAPS) {
1100 ResourceMark rm(THREAD);
1101 HandleMark hm(THREAD);
1102
1103 Handle h_path = java_lang_String::create_from_str(path, CHECK);
1104
1105 Symbol* sym = vmSymbols::jdk_internal_vm_ThreadDumper();
1106 Klass* k = SystemDictionary::resolve_or_fail(sym, true, CHECK);
1107 InstanceKlass* ik = InstanceKlass::cast(k);
1108 if (HAS_PENDING_EXCEPTION) {
1109 java_lang_Throwable::print(PENDING_EXCEPTION, output());
1110 output()->cr();
1111 CLEAR_PENDING_EXCEPTION;
1112 return;
1113 }
1114
1115 // invoke the ThreadDump method to dump to file
1116 JavaValue result(T_OBJECT);
1117 JavaCallArguments args;
1118 args.push_oop(h_path);
1119 args.push_int(overwrite ? JNI_TRUE : JNI_FALSE);
1120 JavaCalls::call_static(&result,
1121 k,
1122 name,
1123 signature,
1124 &args,
1125 THREAD);
1126 if (HAS_PENDING_EXCEPTION) {
1127 java_lang_Throwable::print(PENDING_EXCEPTION, output());
1128 output()->cr();
1129 CLEAR_PENDING_EXCEPTION;
1130 return;
1131 }
1132
1133 // check that result is byte array
1134 oop res = cast_to_oop(result.get_jobject());
1135 assert(res->is_typeArray(), "just checking");
1136 assert(TypeArrayKlass::cast(res->klass())->element_type() == T_BYTE, "just checking");
1137
1138 // copy the bytes to the output stream
1139 typeArrayOop ba = typeArrayOop(res);
1140 jbyte* addr = typeArrayOop(res)->byte_at_addr(0);
1141 output()->print_raw((const char*)addr, ba->length());
1142 }