1 /*
   2  * Copyright (c) 2011, 2024, 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/cdsConfig.hpp"
  27 #include "cds/cds_globals.hpp"
  28 #include "classfile/classLoaderDataGraph.hpp"
  29 #include "classfile/classLoaderHierarchyDCmd.hpp"
  30 #include "classfile/classLoaderStats.hpp"
  31 #include "classfile/javaClasses.hpp"
  32 #include "classfile/systemDictionary.hpp"
  33 #include "classfile/vmClasses.hpp"
  34 #include "code/codeCache.hpp"
  35 #include "compiler/compilationMemoryStatistic.hpp"
  36 #include "compiler/compiler_globals.hpp"
  37 #include "compiler/compileBroker.hpp"
  38 #include "compiler/directivesParser.hpp"
  39 #include "gc/shared/gcVMOperations.hpp"
  40 #include "jvm.h"
  41 #include "memory/metaspace/metaspaceDCmd.hpp"
  42 #include "memory/resourceArea.hpp"
  43 #include "memory/universe.hpp"
  44 #include "nmt/memMapPrinter.hpp"
  45 #include "nmt/memTracker.hpp"
  46 #include "nmt/nmtDCmd.hpp"
  47 #include "oops/instanceKlass.hpp"
  48 #include "oops/objArrayOop.inline.hpp"
  49 #include "oops/oop.inline.hpp"
  50 #include "oops/typeArrayOop.inline.hpp"
  51 #include "prims/jvmtiAgentList.hpp"
  52 #include "runtime/fieldDescriptor.inline.hpp"
  53 #include "runtime/flags/jvmFlag.hpp"
  54 #include "runtime/handles.inline.hpp"
  55 #include "runtime/interfaceSupport.inline.hpp"
  56 #include "runtime/javaCalls.hpp"
  57 #include "runtime/jniHandles.hpp"
  58 #include "runtime/os.hpp"
  59 #include "runtime/vmOperations.hpp"
  60 #include "runtime/vm_version.hpp"
  61 #include "services/diagnosticArgument.hpp"
  62 #include "services/diagnosticCommand.hpp"
  63 #include "services/diagnosticFramework.hpp"
  64 #include "services/heapDumper.hpp"
  65 #include "services/management.hpp"
  66 #include "services/writeableFlags.hpp"
  67 #include "utilities/debug.hpp"
  68 #include "utilities/events.hpp"
  69 #include "utilities/formatBuffer.hpp"
  70 #include "utilities/macros.hpp"
  71 #include "utilities/parseInteger.hpp"
  72 #ifdef LINUX
  73 #include "os_posix.hpp"
  74 #include "mallocInfoDcmd.hpp"
  75 #include "trimCHeapDCmd.hpp"
  76 #include <errno.h>
  77 #endif
  78 
  79 static void loadAgentModule(TRAPS) {
  80   ResourceMark rm(THREAD);
  81   HandleMark hm(THREAD);
  82 
  83   JavaValue result(T_OBJECT);
  84   Handle h_module_name = java_lang_String::create_from_str("jdk.management.agent", CHECK);
  85   JavaCalls::call_static(&result,
  86                          vmClasses::module_Modules_klass(),
  87                          vmSymbols::loadModule_name(),
  88                          vmSymbols::loadModule_signature(),
  89                          h_module_name,
  90                          THREAD);
  91 }
  92 
  93 void DCmd::register_dcmds(){
  94   // Registration of the diagnostic commands
  95   // First argument specifies which interfaces will export the command
  96   // Second argument specifies if the command is enabled
  97   // Third  argument specifies if the command is hidden
  98   uint32_t full_export = DCmd_Source_Internal | DCmd_Source_AttachAPI
  99                          | DCmd_Source_MBean;
 100   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<HelpDCmd>(full_export, true, false));
 101   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<VersionDCmd>(full_export, true, false));
 102   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CommandLineDCmd>(full_export, true, false));
 103   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<PrintSystemPropertiesDCmd>(full_export, true, false));
 104   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<PrintVMFlagsDCmd>(full_export, true, false));
 105   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<SetVMFlagDCmd>(full_export, true, false));
 106   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<VMDynamicLibrariesDCmd>(full_export, true, false));
 107   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<VMUptimeDCmd>(full_export, true, false));
 108   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<VMInfoDCmd>(full_export, true, false));
 109   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<SystemGCDCmd>(full_export, true, false));
 110   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<RunFinalizationDCmd>(full_export, true, false));
 111   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<HeapInfoDCmd>(full_export, true, false));
 112   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<FinalizerInfoDCmd>(full_export, true, false));
 113 #if INCLUDE_SERVICES
 114   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<HeapDumpDCmd>(DCmd_Source_Internal | DCmd_Source_AttachAPI, true, false));
 115   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<ClassHistogramDCmd>(full_export, true, false));
 116   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<SystemDictionaryDCmd>(full_export, true, false));
 117   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<ClassHierarchyDCmd>(full_export, true, false));
 118   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<ClassesDCmd>(full_export, true, false));
 119   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<SymboltableDCmd>(full_export, true, false));
 120   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<StringtableDCmd>(full_export, true, false));
 121   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<metaspace::MetaspaceDCmd>(full_export, true, false));
 122   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<EventLogDCmd>(full_export, true, false));
 123 #if INCLUDE_JVMTI // Both JVMTI and SERVICES have to be enabled to have this dcmd
 124   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JVMTIAgentLoadDCmd>(full_export, true, false));
 125 #endif // INCLUDE_JVMTI
 126 #endif // INCLUDE_SERVICES
 127 #if INCLUDE_JVMTI
 128   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JVMTIDataDumpDCmd>(full_export, true, false));
 129 #endif // INCLUDE_JVMTI
 130   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<ThreadDumpDCmd>(full_export, true, false));
 131   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<ThreadDumpToFileDCmd>(full_export, true, false));
 132   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<ClassLoaderStatsDCmd>(full_export, true, false));
 133   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<ClassLoaderHierarchyDCmd>(full_export, true, false));
 134   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CompileQueueDCmd>(full_export, true, false));
 135   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CodeListDCmd>(full_export, true, false));
 136   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CodeCacheDCmd>(full_export, true, false));
 137 #ifdef LINUX
 138   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<PerfMapDCmd>(full_export, true, false));
 139   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<TrimCLibcHeapDCmd>(full_export, true, false));
 140   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<MallocInfoDcmd>(full_export, true, false));
 141 #endif // LINUX
 142 #if defined(LINUX) || defined(_WIN64)
 143   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<SystemMapDCmd>(full_export, true,false));
 144   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<SystemDumpMapDCmd>(full_export, true,false));
 145 #endif // LINUX or WINDOWS
 146   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CodeHeapAnalyticsDCmd>(full_export, true, false));
 147 
 148   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CompilerDirectivesPrintDCmd>(full_export, true, false));
 149   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CompilerDirectivesAddDCmd>(full_export, true, false));
 150   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CompilerDirectivesRemoveDCmd>(full_export, true, false));
 151   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CompilerDirectivesClearDCmd>(full_export, true, false));
 152   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<CompilationMemoryStatisticDCmd>(full_export, true, false));
 153 
 154   // Enhanced JMX Agent Support
 155   // These commands won't be exported via the DiagnosticCommandMBean until an
 156   // appropriate permission is created for them
 157   uint32_t jmx_agent_export_flags = DCmd_Source_Internal | DCmd_Source_AttachAPI;
 158   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JMXStartRemoteDCmd>(jmx_agent_export_flags, true,false));
 159   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JMXStartLocalDCmd>(jmx_agent_export_flags, true,false));
 160   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JMXStopRemoteDCmd>(jmx_agent_export_flags, true,false));
 161   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<JMXStatusDCmd>(jmx_agent_export_flags, true,false));
 162 
 163   // Debug on cmd (only makes sense with JVMTI since the agentlib needs it).
 164 #if INCLUDE_JVMTI
 165   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<DebugOnCmdStartDCmd>(full_export, true, true));
 166 #endif // INCLUDE_JVMTI
 167 
 168 #if INCLUDE_CDS
 169   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<DumpSharedArchiveDCmd>(full_export, true, false));
 170 #endif // INCLUDE_CDS
 171 
 172   DCmdFactory::register_DCmdFactory(new DCmdFactoryImpl<NMTDCmd>(full_export, true, false));
 173 }
 174 
 175 HelpDCmd::HelpDCmd(outputStream* output, bool heap) : DCmdWithParser(output, heap),
 176   _all("-all", "Show help for all commands", "BOOLEAN", false, "false"),
 177   _cmd("command name", "The name of the command for which we want help",
 178         "STRING", false) {
 179   _dcmdparser.add_dcmd_option(&_all);
 180   _dcmdparser.add_dcmd_argument(&_cmd);
 181 };
 182 
 183 
 184 static int compare_strings(const char** s1, const char** s2) {
 185   return ::strcmp(*s1, *s2);
 186 }
 187 
 188 void HelpDCmd::execute(DCmdSource source, TRAPS) {
 189   if (_all.value()) {
 190     GrowableArray<const char*>* cmd_list = DCmdFactory::DCmd_list(source);
 191     cmd_list->sort(compare_strings);
 192     for (int i = 0; i < cmd_list->length(); i++) {
 193       DCmdFactory* factory = DCmdFactory::factory(source, cmd_list->at(i),
 194                                                   strlen(cmd_list->at(i)));
 195       output()->print_cr("%s%s", factory->name(),
 196                          factory->is_enabled() ? "" : " [disabled]");
 197       output()->print_cr("\t%s", factory->description());
 198       output()->cr();
 199       factory = factory->next();
 200     }
 201   } else if (_cmd.has_value()) {
 202     DCmd* cmd = nullptr;
 203     DCmdFactory* factory = DCmdFactory::factory(source, _cmd.value(),
 204                                                 strlen(_cmd.value()));
 205     if (factory != nullptr) {
 206       output()->print_cr("%s%s", factory->name(),
 207                          factory->is_enabled() ? "" : " [disabled]");
 208       output()->print_cr("%s", factory->description());
 209       output()->print_cr("\nImpact: %s", factory->impact());
 210       output()->cr();
 211       cmd = factory->create_resource_instance(output());
 212       if (cmd != nullptr) {
 213         DCmdMark mark(cmd);
 214         cmd->print_help(factory->name());
 215       }
 216     } else {
 217       output()->print_cr("Help unavailable : '%s' : No such command", _cmd.value());
 218     }
 219   } else {
 220     output()->print_cr("The following commands are available:");
 221     GrowableArray<const char *>* cmd_list = DCmdFactory::DCmd_list(source);
 222     cmd_list->sort(compare_strings);
 223     for (int i = 0; i < cmd_list->length(); i++) {
 224       DCmdFactory* factory = DCmdFactory::factory(source, cmd_list->at(i),
 225                                                   strlen(cmd_list->at(i)));
 226       output()->print_cr("%s%s", factory->name(),
 227                          factory->is_enabled() ? "" : " [disabled]");
 228       factory = factory->_next;
 229     }
 230     output()->print_cr("\nFor more information about a specific command use 'help <command>'.");
 231   }
 232 }
 233 
 234 void VersionDCmd::execute(DCmdSource source, TRAPS) {
 235   output()->print_cr("%s version %s", VM_Version::vm_name(),
 236           VM_Version::vm_release());
 237   JDK_Version jdk_version = JDK_Version::current();
 238   if (jdk_version.patch_version() > 0) {
 239     output()->print_cr("JDK %d.%d.%d.%d", jdk_version.major_version(),
 240             jdk_version.minor_version(), jdk_version.security_version(),
 241             jdk_version.patch_version());
 242   } else {
 243     output()->print_cr("JDK %d.%d.%d", jdk_version.major_version(),
 244             jdk_version.minor_version(), jdk_version.security_version());
 245   }
 246 }
 247 
 248 PrintVMFlagsDCmd::PrintVMFlagsDCmd(outputStream* output, bool heap) :
 249                                    DCmdWithParser(output, heap),
 250   _all("-all", "Print all flags supported by the VM", "BOOLEAN", false, "false") {
 251   _dcmdparser.add_dcmd_option(&_all);
 252 }
 253 
 254 void PrintVMFlagsDCmd::execute(DCmdSource source, TRAPS) {
 255   if (_all.value()) {
 256     JVMFlag::printFlags(output(), true);
 257   } else {
 258     JVMFlag::printSetFlags(output());
 259   }
 260 }
 261 
 262 SetVMFlagDCmd::SetVMFlagDCmd(outputStream* output, bool heap) :
 263                                    DCmdWithParser(output, heap),
 264   _flag("flag name", "The name of the flag we want to set",
 265         "STRING", true),
 266   _value("string value", "The value we want to set", "STRING", false) {
 267   _dcmdparser.add_dcmd_argument(&_flag);
 268   _dcmdparser.add_dcmd_argument(&_value);
 269 }
 270 
 271 void SetVMFlagDCmd::execute(DCmdSource source, TRAPS) {
 272   const char* val = nullptr;
 273   if (_value.value() != nullptr) {
 274     val = _value.value();
 275   }
 276 
 277   FormatBuffer<80> err_msg("%s", "");
 278   int ret = WriteableFlags::set_flag(_flag.value(), val, JVMFlagOrigin::MANAGEMENT, err_msg);
 279 
 280   if (ret != JVMFlag::SUCCESS) {
 281     output()->print_cr("%s", err_msg.buffer());
 282   }
 283 }
 284 
 285 void JVMTIDataDumpDCmd::execute(DCmdSource source, TRAPS) {
 286   if (JvmtiExport::should_post_data_dump()) {
 287     JvmtiExport::post_data_dump();
 288   }
 289 }
 290 
 291 #if INCLUDE_SERVICES
 292 #if INCLUDE_JVMTI
 293 JVMTIAgentLoadDCmd::JVMTIAgentLoadDCmd(outputStream* output, bool heap) :
 294                                        DCmdWithParser(output, heap),
 295   _libpath("library path", "Absolute path of the JVMTI agent to load.",
 296            "STRING", true),
 297   _option("agent option", "Option string to pass the agent.", "STRING", false) {
 298   _dcmdparser.add_dcmd_argument(&_libpath);
 299   _dcmdparser.add_dcmd_argument(&_option);
 300 }
 301 
 302 void JVMTIAgentLoadDCmd::execute(DCmdSource source, TRAPS) {
 303 
 304   if (_libpath.value() == nullptr) {
 305     output()->print_cr("JVMTI.agent_load dcmd needs library path.");
 306     return;
 307   }
 308 
 309   char *suffix = strrchr(_libpath.value(), '.');
 310   bool is_java_agent = (suffix != nullptr) && (strncmp(".jar", suffix, 4) == 0);
 311 
 312   if (is_java_agent) {
 313     if (_option.value() == nullptr) {
 314       JvmtiAgentList::load_agent("instrument", false, _libpath.value(), output());
 315     } else {
 316       size_t opt_len = strlen(_libpath.value()) + strlen(_option.value()) + 2;
 317       if (opt_len > 4096) {
 318         output()->print_cr("JVMTI agent attach failed: Options is too long.");
 319         return;
 320       }
 321 
 322       char *opt = (char *)os::malloc(opt_len, mtInternal);
 323       if (opt == nullptr) {
 324         output()->print_cr("JVMTI agent attach failed: "
 325                            "Could not allocate " SIZE_FORMAT " bytes for argument.",
 326                            opt_len);
 327         return;
 328       }
 329 
 330       jio_snprintf(opt, opt_len, "%s=%s", _libpath.value(), _option.value());
 331       JvmtiAgentList::load_agent("instrument", false, opt, output());
 332 
 333       os::free(opt);
 334     }
 335   } else {
 336     JvmtiAgentList::load_agent(_libpath.value(), true, _option.value(), output());
 337   }
 338 }
 339 
 340 #endif // INCLUDE_JVMTI
 341 #endif // INCLUDE_SERVICES
 342 
 343 void PrintSystemPropertiesDCmd::execute(DCmdSource source, TRAPS) {
 344   // load VMSupport
 345   Symbol* klass = vmSymbols::jdk_internal_vm_VMSupport();
 346   Klass* k = SystemDictionary::resolve_or_fail(klass, true, CHECK);
 347   InstanceKlass* ik = InstanceKlass::cast(k);
 348   if (ik->should_be_initialized()) {
 349     ik->initialize(THREAD);
 350   }
 351   if (HAS_PENDING_EXCEPTION) {
 352     java_lang_Throwable::print(PENDING_EXCEPTION, output());
 353     output()->cr();
 354     CLEAR_PENDING_EXCEPTION;
 355     return;
 356   }
 357 
 358   // invoke the serializePropertiesToByteArray method
 359   JavaValue result(T_OBJECT);
 360   JavaCallArguments args;
 361 
 362   Symbol* signature = vmSymbols::void_byte_array_signature();
 363   JavaCalls::call_static(&result,
 364                          ik,
 365                          vmSymbols::serializePropertiesToByteArray_name(),
 366                          signature,
 367                          &args,
 368                          THREAD);
 369   if (HAS_PENDING_EXCEPTION) {
 370     java_lang_Throwable::print(PENDING_EXCEPTION, output());
 371     output()->cr();
 372     CLEAR_PENDING_EXCEPTION;
 373     return;
 374   }
 375 
 376   // The result should be a [B
 377   oop res = result.get_oop();
 378   assert(res->is_typeArray(), "just checking");
 379   assert(TypeArrayKlass::cast(res->klass())->element_type() == T_BYTE, "just checking");
 380 
 381   // copy the bytes to the output stream
 382   typeArrayOop ba = typeArrayOop(res);
 383   jbyte* addr = typeArrayOop(res)->byte_at_addr(0);
 384   output()->print_raw((const char*)addr, ba->length());
 385 }
 386 
 387 VMUptimeDCmd::VMUptimeDCmd(outputStream* output, bool heap) :
 388                            DCmdWithParser(output, heap),
 389   _date("-date", "Add a prefix with current date", "BOOLEAN", false, "false") {
 390   _dcmdparser.add_dcmd_option(&_date);
 391 }
 392 
 393 void VMUptimeDCmd::execute(DCmdSource source, TRAPS) {
 394   if (_date.value()) {
 395     output()->date_stamp(true, "", ": ");
 396   }
 397   output()->time_stamp().update_to(tty->time_stamp().ticks());
 398   output()->stamp();
 399   output()->print_cr(" s");
 400 }
 401 
 402 void VMInfoDCmd::execute(DCmdSource source, TRAPS) {
 403   VMError::print_vm_info(_output);
 404 }
 405 
 406 void SystemGCDCmd::execute(DCmdSource source, TRAPS) {
 407   Universe::heap()->collect(GCCause::_dcmd_gc_run);
 408 }
 409 
 410 void RunFinalizationDCmd::execute(DCmdSource source, TRAPS) {
 411   Klass* k = vmClasses::System_klass();
 412   JavaValue result(T_VOID);
 413   JavaCalls::call_static(&result, k,
 414                          vmSymbols::run_finalization_name(),
 415                          vmSymbols::void_method_signature(), CHECK);
 416 }
 417 
 418 void HeapInfoDCmd::execute(DCmdSource source, TRAPS) {
 419   MutexLocker hl(THREAD, Heap_lock);
 420   Universe::heap()->print_on(output());
 421 }
 422 
 423 void FinalizerInfoDCmd::execute(DCmdSource source, TRAPS) {
 424   ResourceMark rm(THREAD);
 425 
 426   if (!InstanceKlass::is_finalization_enabled()) {
 427     output()->print_cr("Finalization is disabled");
 428     return;
 429   }
 430 
 431   Klass* k = SystemDictionary::resolve_or_fail(
 432     vmSymbols::finalizer_histogram_klass(), true, CHECK);
 433 
 434   JavaValue result(T_ARRAY);
 435 
 436   // We are calling lang.ref.FinalizerHistogram.getFinalizerHistogram() method
 437   // and expect it to return array of FinalizerHistogramEntry as Object[]
 438 
 439   JavaCalls::call_static(&result, k,
 440                          vmSymbols::get_finalizer_histogram_name(),
 441                          vmSymbols::void_finalizer_histogram_entry_array_signature(), CHECK);
 442 
 443   objArrayOop result_oop = (objArrayOop) result.get_oop();
 444   if (result_oop->length() == 0) {
 445     output()->print_cr("No instances waiting for finalization found");
 446     return;
 447   }
 448 
 449   oop foop = result_oop->obj_at(0);
 450   InstanceKlass* ik = InstanceKlass::cast(foop->klass());
 451 
 452   fieldDescriptor count_fd, name_fd;
 453 
 454   Klass* count_res = ik->find_field(
 455     vmSymbols::finalizer_histogram_entry_count_field(), vmSymbols::int_signature(), &count_fd);
 456 
 457   Klass* name_res = ik->find_field(
 458     vmSymbols::finalizer_histogram_entry_name_field(), vmSymbols::string_signature(), &name_fd);
 459 
 460   assert(count_res != nullptr && name_res != nullptr, "Unexpected layout of FinalizerHistogramEntry");
 461 
 462   output()->print_cr("Unreachable instances waiting for finalization");
 463   output()->print_cr("#instances  class name");
 464   output()->print_cr("-----------------------");
 465 
 466   for (int i = 0; i < result_oop->length(); ++i) {
 467     oop element_oop = result_oop->obj_at(i);
 468     oop str_oop = element_oop->obj_field(name_fd.offset());
 469     char *name = java_lang_String::as_utf8_string(str_oop);
 470     int count = element_oop->int_field(count_fd.offset());
 471     output()->print_cr("%10d  %s", count, name);
 472   }
 473 }
 474 
 475 #if INCLUDE_SERVICES // Heap dumping/inspection supported
 476 HeapDumpDCmd::HeapDumpDCmd(outputStream* output, bool heap) :
 477                            DCmdWithParser(output, heap),
 478   _filename("filename","Name of the dump file", "FILE",true),
 479   _all("-all", "Dump all objects, including unreachable objects",
 480        "BOOLEAN", false, "false"),
 481   _gzip("-gz", "If specified, the heap dump is written in gzipped format "
 482                "using the given compression level. 1 (recommended) is the fastest, "
 483                "9 the strongest compression.", "INT", false, "1"),
 484   _overwrite("-overwrite", "If specified, the dump file will be overwritten if it exists",
 485            "BOOLEAN", false, "false"),
 486   _parallel("-parallel", "Number of parallel threads to use for heap dump. The VM "
 487                           "will try to use the specified number of threads, but might use fewer.",
 488             "INT", false, "1") {
 489   _dcmdparser.add_dcmd_option(&_all);
 490   _dcmdparser.add_dcmd_argument(&_filename);
 491   _dcmdparser.add_dcmd_option(&_gzip);
 492   _dcmdparser.add_dcmd_option(&_overwrite);
 493   _dcmdparser.add_dcmd_option(&_parallel);
 494 }
 495 
 496 void HeapDumpDCmd::execute(DCmdSource source, TRAPS) {
 497   jlong level = -1; // -1 means no compression.
 498   jlong parallel = HeapDumper::default_num_of_dump_threads();
 499 
 500   if (_gzip.is_set()) {
 501     level = _gzip.value();
 502 
 503     if (level < 1 || level > 9) {
 504       output()->print_cr("Compression level out of range (1-9): " JLONG_FORMAT, level);
 505       return;
 506     }
 507   }
 508 
 509   if (_parallel.is_set()) {
 510     parallel = _parallel.value();
 511 
 512     if (parallel < 0) {
 513       output()->print_cr("Invalid number of parallel dump threads.");
 514       return;
 515     } else if (parallel == 0) {
 516       // 0 implies to disable parallel heap dump, in such case, we use serial dump instead
 517       parallel = 1;
 518     }
 519   }
 520 
 521   // Request a full GC before heap dump if _all is false
 522   // This helps reduces the amount of unreachable objects in the dump
 523   // and makes it easier to browse.
 524   HeapDumper dumper(!_all.value() /* request GC if _all is false*/);
 525   dumper.dump(_filename.value(), output(), (int) level, _overwrite.value(), (uint)parallel);
 526 }
 527 
 528 ClassHistogramDCmd::ClassHistogramDCmd(outputStream* output, bool heap) :
 529                                        DCmdWithParser(output, heap),
 530   _all("-all", "Inspect all objects, including unreachable objects",
 531        "BOOLEAN", false, "false"),
 532   _parallel_thread_num("-parallel",
 533        "Number of parallel threads to use for heap inspection. "
 534        "0 (the default) means let the VM determine the number of threads to use. "
 535        "1 means use one thread (disable parallelism). "
 536        "For any other value the VM will try to use the specified number of "
 537        "threads, but might use fewer.",
 538        "INT", false, "0") {
 539   _dcmdparser.add_dcmd_option(&_all);
 540   _dcmdparser.add_dcmd_option(&_parallel_thread_num);
 541 }
 542 
 543 void ClassHistogramDCmd::execute(DCmdSource source, TRAPS) {
 544   jlong num = _parallel_thread_num.value();
 545   if (num < 0) {
 546     output()->print_cr("Parallel thread number out of range (>=0): " JLONG_FORMAT, num);
 547     return;
 548   }
 549   uint parallel_thread_num = num == 0
 550       ? MAX2<uint>(1, (uint)os::initial_active_processor_count() * 3 / 8)
 551       : num;
 552   VM_GC_HeapInspection heapop(output(),
 553                               !_all.value(), /* request full gc if false */
 554                               parallel_thread_num);
 555   VMThread::execute(&heapop);
 556 }
 557 
 558 #endif // INCLUDE_SERVICES
 559 
 560 ThreadDumpDCmd::ThreadDumpDCmd(outputStream* output, bool heap) :
 561                                DCmdWithParser(output, heap),
 562   _locks("-l", "print java.util.concurrent locks", "BOOLEAN", false, "false"),
 563   _extended("-e", "print extended thread information", "BOOLEAN", false, "false") {
 564   _dcmdparser.add_dcmd_option(&_locks);
 565   _dcmdparser.add_dcmd_option(&_extended);
 566 }
 567 
 568 void ThreadDumpDCmd::execute(DCmdSource source, TRAPS) {
 569   // thread stacks and JNI global handles
 570   VM_PrintThreads op1(output(), _locks.value(), _extended.value(), true /* print JNI handle info */);
 571   VMThread::execute(&op1);
 572 
 573   // Deadlock detection
 574   VM_FindDeadlocks op2(output());
 575   VMThread::execute(&op2);
 576 }
 577 
 578 // Enhanced JMX Agent support
 579 
 580 JMXStartRemoteDCmd::JMXStartRemoteDCmd(outputStream *output, bool heap_allocated) :
 581 
 582   DCmdWithParser(output, heap_allocated),
 583 
 584   _config_file
 585   ("config.file",
 586    "set com.sun.management.config.file", "STRING", false),
 587 
 588   _jmxremote_host
 589   ("jmxremote.host",
 590    "set com.sun.management.jmxremote.host", "STRING", false),
 591 
 592   _jmxremote_port
 593   ("jmxremote.port",
 594    "set com.sun.management.jmxremote.port", "STRING", false),
 595 
 596   _jmxremote_rmi_port
 597   ("jmxremote.rmi.port",
 598    "set com.sun.management.jmxremote.rmi.port", "STRING", false),
 599 
 600   _jmxremote_ssl
 601   ("jmxremote.ssl",
 602    "set com.sun.management.jmxremote.ssl", "STRING", false),
 603 
 604   _jmxremote_registry_ssl
 605   ("jmxremote.registry.ssl",
 606    "set com.sun.management.jmxremote.registry.ssl", "STRING", false),
 607 
 608   _jmxremote_authenticate
 609   ("jmxremote.authenticate",
 610    "set com.sun.management.jmxremote.authenticate", "STRING", false),
 611 
 612   _jmxremote_password_file
 613   ("jmxremote.password.file",
 614    "set com.sun.management.jmxremote.password.file", "STRING", false),
 615 
 616   _jmxremote_access_file
 617   ("jmxremote.access.file",
 618    "set com.sun.management.jmxremote.access.file", "STRING", false),
 619 
 620   _jmxremote_login_config
 621   ("jmxremote.login.config",
 622    "set com.sun.management.jmxremote.login.config", "STRING", false),
 623 
 624   _jmxremote_ssl_enabled_cipher_suites
 625   ("jmxremote.ssl.enabled.cipher.suites",
 626    "set com.sun.management.jmxremote.ssl.enabled.cipher.suite", "STRING", false),
 627 
 628   _jmxremote_ssl_enabled_protocols
 629   ("jmxremote.ssl.enabled.protocols",
 630    "set com.sun.management.jmxremote.ssl.enabled.protocols", "STRING", false),
 631 
 632   _jmxremote_ssl_need_client_auth
 633   ("jmxremote.ssl.need.client.auth",
 634    "set com.sun.management.jmxremote.need.client.auth", "STRING", false),
 635 
 636   _jmxremote_ssl_config_file
 637   ("jmxremote.ssl.config.file",
 638    "set com.sun.management.jmxremote.ssl.config.file", "STRING", false),
 639 
 640 // JDP Protocol support
 641   _jmxremote_autodiscovery
 642   ("jmxremote.autodiscovery",
 643    "set com.sun.management.jmxremote.autodiscovery", "STRING", false),
 644 
 645    _jdp_port
 646   ("jdp.port",
 647    "set com.sun.management.jdp.port", "INT", false),
 648 
 649    _jdp_address
 650   ("jdp.address",
 651    "set com.sun.management.jdp.address", "STRING", false),
 652 
 653    _jdp_source_addr
 654   ("jdp.source_addr",
 655    "set com.sun.management.jdp.source_addr", "STRING", false),
 656 
 657    _jdp_ttl
 658   ("jdp.ttl",
 659    "set com.sun.management.jdp.ttl", "INT", false),
 660 
 661    _jdp_pause
 662   ("jdp.pause",
 663    "set com.sun.management.jdp.pause", "INT", false),
 664 
 665    _jdp_name
 666   ("jdp.name",
 667    "set com.sun.management.jdp.name", "STRING", false)
 668 
 669   {
 670     _dcmdparser.add_dcmd_option(&_config_file);
 671     _dcmdparser.add_dcmd_option(&_jmxremote_host);
 672     _dcmdparser.add_dcmd_option(&_jmxremote_port);
 673     _dcmdparser.add_dcmd_option(&_jmxremote_rmi_port);
 674     _dcmdparser.add_dcmd_option(&_jmxremote_ssl);
 675     _dcmdparser.add_dcmd_option(&_jmxremote_registry_ssl);
 676     _dcmdparser.add_dcmd_option(&_jmxremote_authenticate);
 677     _dcmdparser.add_dcmd_option(&_jmxremote_password_file);
 678     _dcmdparser.add_dcmd_option(&_jmxremote_access_file);
 679     _dcmdparser.add_dcmd_option(&_jmxremote_login_config);
 680     _dcmdparser.add_dcmd_option(&_jmxremote_ssl_enabled_cipher_suites);
 681     _dcmdparser.add_dcmd_option(&_jmxremote_ssl_enabled_protocols);
 682     _dcmdparser.add_dcmd_option(&_jmxremote_ssl_need_client_auth);
 683     _dcmdparser.add_dcmd_option(&_jmxremote_ssl_config_file);
 684     _dcmdparser.add_dcmd_option(&_jmxremote_autodiscovery);
 685     _dcmdparser.add_dcmd_option(&_jdp_port);
 686     _dcmdparser.add_dcmd_option(&_jdp_address);
 687     _dcmdparser.add_dcmd_option(&_jdp_source_addr);
 688     _dcmdparser.add_dcmd_option(&_jdp_ttl);
 689     _dcmdparser.add_dcmd_option(&_jdp_pause);
 690     _dcmdparser.add_dcmd_option(&_jdp_name);
 691 }
 692 
 693 void JMXStartRemoteDCmd::execute(DCmdSource source, TRAPS) {
 694     ResourceMark rm(THREAD);
 695     HandleMark hm(THREAD);
 696 
 697     // Load and initialize the jdk.internal.agent.Agent class
 698     // invoke startRemoteManagementAgent(string) method to start
 699     // the remote management server.
 700     // throw java.lang.NoSuchMethodError if the method doesn't exist
 701 
 702     loadAgentModule(CHECK);
 703     Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
 704     Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::jdk_internal_agent_Agent(), loader, Handle(), true, CHECK);
 705 
 706     JavaValue result(T_VOID);
 707 
 708     // Pass all command line arguments to java as key=value,...
 709     // All checks are done on java side
 710 
 711     int len = 0;
 712     stringStream options;
 713     char comma[2] = {0,0};
 714 
 715     // Leave default values on Agent.class side and pass only
 716     // arguments explicitly set by user. All arguments passed
 717     // to jcmd override properties with the same name set by
 718     // command line with -D or by managmenent.properties
 719     // file.
 720 #define PUT_OPTION(a) \
 721     do { \
 722         if ( (a).is_set() ){ \
 723             if ( *((a).type()) == 'I' ) { \
 724                 options.print("%scom.sun.management.%s=" JLONG_FORMAT, comma, (a).name(), (jlong)((a).value())); \
 725             } else { \
 726                 options.print("%scom.sun.management.%s=%s", comma, (a).name(), (char*)((a).value())); \
 727             } \
 728             comma[0] = ','; \
 729         }\
 730     } while(0);
 731 
 732 
 733     PUT_OPTION(_config_file);
 734     PUT_OPTION(_jmxremote_host);
 735     PUT_OPTION(_jmxremote_port);
 736     PUT_OPTION(_jmxremote_rmi_port);
 737     PUT_OPTION(_jmxremote_ssl);
 738     PUT_OPTION(_jmxremote_registry_ssl);
 739     PUT_OPTION(_jmxremote_authenticate);
 740     PUT_OPTION(_jmxremote_password_file);
 741     PUT_OPTION(_jmxremote_access_file);
 742     PUT_OPTION(_jmxremote_login_config);
 743     PUT_OPTION(_jmxremote_ssl_enabled_cipher_suites);
 744     PUT_OPTION(_jmxremote_ssl_enabled_protocols);
 745     PUT_OPTION(_jmxremote_ssl_need_client_auth);
 746     PUT_OPTION(_jmxremote_ssl_config_file);
 747     PUT_OPTION(_jmxremote_autodiscovery);
 748     PUT_OPTION(_jdp_port);
 749     PUT_OPTION(_jdp_address);
 750     PUT_OPTION(_jdp_source_addr);
 751     PUT_OPTION(_jdp_ttl);
 752     PUT_OPTION(_jdp_pause);
 753     PUT_OPTION(_jdp_name);
 754 
 755 #undef PUT_OPTION
 756 
 757     Handle str = java_lang_String::create_from_str(options.as_string(), CHECK);
 758     JavaCalls::call_static(&result, k, vmSymbols::startRemoteAgent_name(), vmSymbols::string_void_signature(), str, CHECK);
 759 }
 760 
 761 JMXStartLocalDCmd::JMXStartLocalDCmd(outputStream *output, bool heap_allocated) :
 762   DCmd(output, heap_allocated) {
 763   // do nothing
 764 }
 765 
 766 void JMXStartLocalDCmd::execute(DCmdSource source, TRAPS) {
 767     ResourceMark rm(THREAD);
 768     HandleMark hm(THREAD);
 769 
 770     // Load and initialize the jdk.internal.agent.Agent class
 771     // invoke startLocalManagementAgent(void) method to start
 772     // the local management server
 773     // throw java.lang.NoSuchMethodError if method doesn't exist
 774 
 775     loadAgentModule(CHECK);
 776     Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
 777     Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::jdk_internal_agent_Agent(), loader, Handle(), true, CHECK);
 778 
 779     JavaValue result(T_VOID);
 780     JavaCalls::call_static(&result, k, vmSymbols::startLocalAgent_name(), vmSymbols::void_method_signature(), CHECK);
 781 }
 782 
 783 void JMXStopRemoteDCmd::execute(DCmdSource source, TRAPS) {
 784     ResourceMark rm(THREAD);
 785     HandleMark hm(THREAD);
 786 
 787     // Load and initialize the jdk.internal.agent.Agent class
 788     // invoke stopRemoteManagementAgent method to stop the
 789     // management server
 790     // throw java.lang.NoSuchMethodError if method doesn't exist
 791 
 792     loadAgentModule(CHECK);
 793     Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
 794     Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::jdk_internal_agent_Agent(), loader, Handle(), true, CHECK);
 795 
 796     JavaValue result(T_VOID);
 797     JavaCalls::call_static(&result, k, vmSymbols::stopRemoteAgent_name(), vmSymbols::void_method_signature(), CHECK);
 798 }
 799 
 800 JMXStatusDCmd::JMXStatusDCmd(outputStream *output, bool heap_allocated) :
 801   DCmd(output, heap_allocated) {
 802   // do nothing
 803 }
 804 
 805 void JMXStatusDCmd::execute(DCmdSource source, TRAPS) {
 806   ResourceMark rm(THREAD);
 807   HandleMark hm(THREAD);
 808 
 809   // Load and initialize the jdk.internal.agent.Agent class
 810   // invoke getManagementAgentStatus() method to generate the status info
 811   // throw java.lang.NoSuchMethodError if method doesn't exist
 812 
 813   loadAgentModule(CHECK);
 814   Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
 815   Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::jdk_internal_agent_Agent(), loader, Handle(), true, CHECK);
 816 
 817   JavaValue result(T_OBJECT);
 818   JavaCalls::call_static(&result, k, vmSymbols::getAgentStatus_name(), vmSymbols::void_string_signature(), CHECK);
 819 
 820   jvalue* jv = (jvalue*) result.get_value_addr();
 821   oop str = cast_to_oop(jv->l);
 822   if (str != nullptr) {
 823       char* out = java_lang_String::as_utf8_string(str);
 824       if (out) {
 825           // Avoid using print_cr() because length maybe longer than O_BUFLEN
 826           output()->print_raw_cr(out);
 827           return;
 828       }
 829   }
 830   output()->print_cr("Error obtaining management agent status");
 831 }
 832 
 833 VMDynamicLibrariesDCmd::VMDynamicLibrariesDCmd(outputStream *output, bool heap_allocated) :
 834   DCmd(output, heap_allocated) {
 835   // do nothing
 836 }
 837 
 838 void VMDynamicLibrariesDCmd::execute(DCmdSource source, TRAPS) {
 839   os::print_dll_info(output());
 840   output()->cr();
 841 }
 842 
 843 void CompileQueueDCmd::execute(DCmdSource source, TRAPS) {
 844   VM_PrintCompileQueue printCompileQueueOp(output());
 845   VMThread::execute(&printCompileQueueOp);
 846 }
 847 
 848 void CodeListDCmd::execute(DCmdSource source, TRAPS) {
 849   CodeCache::print_codelist(output());
 850 }
 851 
 852 void CodeCacheDCmd::execute(DCmdSource source, TRAPS) {
 853   CodeCache::print_layout(output());
 854 }
 855 
 856 #ifdef LINUX
 857 PerfMapDCmd::PerfMapDCmd(outputStream* output, bool heap) :
 858              DCmdWithParser(output, heap),
 859   _filename("filename", "Name of the map file", "FILE", false, DEFAULT_PERFMAP_FILENAME)
 860 {
 861   _dcmdparser.add_dcmd_argument(&_filename);
 862 }
 863 
 864 void PerfMapDCmd::execute(DCmdSource source, TRAPS) {
 865   CodeCache::write_perf_map(_filename.value(), output());
 866 }
 867 #endif // LINUX
 868 
 869 //---<  BEGIN  >--- CodeHeap State Analytics.
 870 CodeHeapAnalyticsDCmd::CodeHeapAnalyticsDCmd(outputStream* output, bool heap) :
 871                                              DCmdWithParser(output, heap),
 872   _function("function", "Function to be performed (aggregate, UsedSpace, FreeSpace, MethodCount, MethodSpace, MethodAge, MethodNames, discard", "STRING", false, "all"),
 873   _granularity("granularity", "Detail level - smaller value -> more detail", "INT", false, "4096") {
 874   _dcmdparser.add_dcmd_argument(&_function);
 875   _dcmdparser.add_dcmd_argument(&_granularity);
 876 }
 877 
 878 void CodeHeapAnalyticsDCmd::execute(DCmdSource source, TRAPS) {
 879   jlong granularity = _granularity.value();
 880   if (granularity < 1) {
 881     Exceptions::fthrow(THREAD_AND_LOCATION, vmSymbols::java_lang_IllegalArgumentException(),
 882                        "Invalid granularity value " JLONG_FORMAT  ". Should be positive.\n", granularity);
 883     return;
 884   }
 885 
 886   CompileBroker::print_heapinfo(output(), _function.value(), granularity);
 887 }
 888 //---<  END  >--- CodeHeap State Analytics.
 889 
 890 EventLogDCmd::EventLogDCmd(outputStream* output, bool heap) :
 891   DCmdWithParser(output, heap),
 892   _log("log", "Name of log to be printed. If omitted, all logs are printed.", "STRING", false, nullptr),
 893   _max("max", "Maximum number of events to be printed (newest first). If omitted, all events are printed.", "STRING", false, nullptr)
 894 {
 895   _dcmdparser.add_dcmd_option(&_log);
 896   _dcmdparser.add_dcmd_option(&_max);
 897 }
 898 
 899 void EventLogDCmd::execute(DCmdSource source, TRAPS) {
 900   const char* max_value = _max.value();
 901   int max = -1;
 902   if (max_value != nullptr) {
 903     char* endptr = nullptr;
 904     if (!parse_integer(max_value, &max)) {
 905       output()->print_cr("Invalid max option: \"%s\".", max_value);
 906       return;
 907     }
 908   }
 909   const char* log_name = _log.value();
 910   if (log_name != nullptr) {
 911     Events::print_one(output(), log_name, max);
 912   } else {
 913     Events::print_all(output(), max);
 914   }
 915 }
 916 
 917 void CompilerDirectivesPrintDCmd::execute(DCmdSource source, TRAPS) {
 918   DirectivesStack::print(output());
 919 }
 920 
 921 CompilerDirectivesAddDCmd::CompilerDirectivesAddDCmd(outputStream* output, bool heap) :
 922                            DCmdWithParser(output, heap),
 923   _filename("filename","Name of the directives file", "STRING",true) {
 924   _dcmdparser.add_dcmd_argument(&_filename);
 925 }
 926 
 927 void CompilerDirectivesAddDCmd::execute(DCmdSource source, TRAPS) {
 928   DirectivesParser::parse_from_file(_filename.value(), output(), true);
 929 }
 930 
 931 void CompilerDirectivesRemoveDCmd::execute(DCmdSource source, TRAPS) {
 932   DirectivesStack::pop(1);
 933 }
 934 
 935 void CompilerDirectivesClearDCmd::execute(DCmdSource source, TRAPS) {
 936   DirectivesStack::clear();
 937 }
 938 #if INCLUDE_SERVICES
 939 ClassHierarchyDCmd::ClassHierarchyDCmd(outputStream* output, bool heap) :
 940                                        DCmdWithParser(output, heap),
 941   _print_interfaces("-i", "Inherited interfaces should be printed.", "BOOLEAN", false, "false"),
 942   _print_subclasses("-s", "If a classname is specified, print its subclasses "
 943                     "in addition to its superclasses. Without this option only the "
 944                     "superclasses will be printed.", "BOOLEAN", false, "false"),
 945   _classname("classname", "Name of class whose hierarchy should be printed. "
 946              "If not specified, all class hierarchies are printed.",
 947              "STRING", false) {
 948   _dcmdparser.add_dcmd_option(&_print_interfaces);
 949   _dcmdparser.add_dcmd_option(&_print_subclasses);
 950   _dcmdparser.add_dcmd_argument(&_classname);
 951 }
 952 
 953 void ClassHierarchyDCmd::execute(DCmdSource source, TRAPS) {
 954   VM_PrintClassHierarchy printClassHierarchyOp(output(), _print_interfaces.value(),
 955                                                _print_subclasses.value(), _classname.value());
 956   VMThread::execute(&printClassHierarchyOp);
 957 }
 958 #endif
 959 
 960 ClassesDCmd::ClassesDCmd(outputStream* output, bool heap) :
 961                                      DCmdWithParser(output, heap),
 962   _verbose("-verbose",
 963            "Dump the detailed content of a Java class. "
 964            "Some classes are annotated with flags: "
 965            "F = has, or inherits, a non-empty finalize method, "
 966            "f = has final method, "
 967            "W = methods rewritten, "
 968            "C = marked with @Contended annotation, "
 969            "R = has been redefined, "
 970            "S = is shared class",
 971            "BOOLEAN", false, "false") {
 972   _dcmdparser.add_dcmd_option(&_verbose);
 973 }
 974 
 975 class VM_PrintClasses : public VM_Operation {
 976 private:
 977   outputStream* _out;
 978   bool _verbose;
 979 public:
 980   VM_PrintClasses(outputStream* out, bool verbose) : _out(out), _verbose(verbose) {}
 981 
 982   virtual VMOp_Type type() const { return VMOp_PrintClasses; }
 983 
 984   virtual void doit() {
 985     PrintClassClosure closure(_out, _verbose);
 986     ClassLoaderDataGraph::classes_do(&closure);
 987   }
 988 };
 989 
 990 void ClassesDCmd::execute(DCmdSource source, TRAPS) {
 991   VM_PrintClasses vmop(output(), _verbose.value());
 992   VMThread::execute(&vmop);
 993 }
 994 
 995 #if INCLUDE_CDS
 996 #define DEFAULT_CDS_ARCHIVE_FILENAME "java_pid%p_<subcmd>.jsa"
 997 
 998 DumpSharedArchiveDCmd::DumpSharedArchiveDCmd(outputStream* output, bool heap) :
 999                                      DCmdWithParser(output, heap),
1000   _suboption("subcmd", "static_dump | dynamic_dump", "STRING", true),
1001   _filename("filename", "Name of shared archive to be dumped", "FILE", false,
1002             DEFAULT_CDS_ARCHIVE_FILENAME)
1003 {
1004   _dcmdparser.add_dcmd_argument(&_suboption);
1005   _dcmdparser.add_dcmd_argument(&_filename);
1006 }
1007 
1008 void DumpSharedArchiveDCmd::execute(DCmdSource source, TRAPS) {
1009   jboolean is_static;
1010   const char* scmd = _suboption.value();
1011 
1012   // The check for _filename.is_set() is because we don't want to use
1013   // DEFAULT_CDS_ARCHIVE_FILENAME, since it is meant as a description
1014   // of the default, not the actual default.
1015   const char* file = _filename.is_set() ? _filename.value() : nullptr;
1016 
1017   if (strcmp(scmd, "static_dump") == 0) {
1018     is_static = JNI_TRUE;
1019     output()->print("Static dump: ");
1020   } else if (strcmp(scmd, "dynamic_dump") == 0) {
1021     is_static = JNI_FALSE;
1022     output()->print("Dynamic dump: ");
1023     if (!CDSConfig::is_using_archive()) {
1024       output()->print_cr("Dynamic dump is unsupported when base CDS archive is not loaded");
1025       return;
1026     }
1027     if (!RecordDynamicDumpInfo) {
1028       output()->print_cr("Dump dynamic should run with -XX:+RecordDynamicDumpInfo");
1029       return;
1030     }
1031   } else {
1032     output()->print_cr("Invalid command for VM.cds, valid input is static_dump or dynamic_dump");
1033     return;
1034   }
1035 
1036   // call CDS.dumpSharedArchive
1037   Handle fileh;
1038   if (file != nullptr) {
1039     fileh = java_lang_String::create_from_str(file, CHECK);
1040   }
1041   Symbol* cds_name  = vmSymbols::jdk_internal_misc_CDS();
1042   Klass*  cds_klass = SystemDictionary::resolve_or_fail(cds_name, true /*throw error*/,  CHECK);
1043   JavaValue result(T_OBJECT);
1044   JavaCallArguments args;
1045   args.push_int(is_static);
1046   args.push_oop(fileh);
1047   JavaCalls::call_static(&result,
1048                          cds_klass,
1049                          vmSymbols::dumpSharedArchive(),
1050                          vmSymbols::dumpSharedArchive_signature(),
1051                          &args, CHECK);
1052   if (!HAS_PENDING_EXCEPTION) {
1053     assert(result.get_type() == T_OBJECT, "Sanity check");
1054     // result contains the archive name
1055     char* archive_name = java_lang_String::as_utf8_string(result.get_oop());
1056     output()->print_cr("%s", archive_name);
1057   }
1058 }
1059 #endif // INCLUDE_CDS
1060 
1061 #if INCLUDE_JVMTI
1062 extern "C" typedef char const* (JNICALL *debugInit_startDebuggingViaCommandPtr)(JNIEnv* env, jthread thread, char const** transport_name,
1063                                                                                 char const** address, jboolean* first_start);
1064 static debugInit_startDebuggingViaCommandPtr dvc_start_ptr = nullptr;
1065 
1066 void DebugOnCmdStartDCmd::execute(DCmdSource source, TRAPS) {
1067   char const* transport = nullptr;
1068   char const* addr = nullptr;
1069   jboolean is_first_start = JNI_FALSE;
1070   JavaThread* thread = THREAD;
1071   jthread jt = JNIHandles::make_local(thread->threadObj());
1072   ThreadToNativeFromVM ttn(thread);
1073   const char *error = "Could not find jdwp agent.";
1074 
1075   if (!dvc_start_ptr) {
1076     JvmtiAgentList::Iterator it = JvmtiAgentList::agents();
1077     while (it.has_next()) {
1078       JvmtiAgent* agent = it.next();
1079       if ((strcmp("jdwp", agent->name()) == 0) && (dvc_start_ptr == nullptr)) {
1080         char const* func = "debugInit_startDebuggingViaCommand";
1081         dvc_start_ptr = (debugInit_startDebuggingViaCommandPtr) os::find_agent_function(agent, false, &func, 1);
1082       }
1083     }
1084   }
1085 
1086   if (dvc_start_ptr) {
1087     error = dvc_start_ptr(thread->jni_environment(), jt, &transport, &addr, &is_first_start);
1088   }
1089 
1090   if (error != nullptr) {
1091     output()->print_cr("Debugging has not been started: %s", error);
1092   } else {
1093     output()->print_cr(is_first_start ? "Debugging has been started." : "Debugging is already active.");
1094     output()->print_cr("Transport : %s", transport ? transport : "#unknown");
1095     output()->print_cr("Address : %s", addr ? addr : "#unknown");
1096   }
1097 }
1098 #endif // INCLUDE_JVMTI
1099 
1100 ThreadDumpToFileDCmd::ThreadDumpToFileDCmd(outputStream* output, bool heap) :
1101                                            DCmdWithParser(output, heap),
1102   _overwrite("-overwrite", "May overwrite existing file", "BOOLEAN", false, "false"),
1103   _format("-format", "Output format (\"plain\" or \"json\")", "STRING", false, "plain"),
1104   _filepath("filepath", "The file path to the output file", "FILE", true) {
1105   _dcmdparser.add_dcmd_option(&_overwrite);
1106   _dcmdparser.add_dcmd_option(&_format);
1107   _dcmdparser.add_dcmd_argument(&_filepath);
1108 }
1109 
1110 void ThreadDumpToFileDCmd::execute(DCmdSource source, TRAPS) {
1111   bool json = (_format.value() != nullptr) && (strcmp(_format.value(), "json") == 0);
1112   char* path = _filepath.value();
1113   bool overwrite = _overwrite.value();
1114   Symbol* name = (json) ? vmSymbols::dumpThreadsToJson_name() : vmSymbols::dumpThreads_name();
1115   dumpToFile(name, vmSymbols::string_bool_byte_array_signature(), path, overwrite, CHECK);
1116 }
1117 
1118 void ThreadDumpToFileDCmd::dumpToFile(Symbol* name, Symbol* signature, const char* path, bool overwrite, TRAPS) {
1119   ResourceMark rm(THREAD);
1120   HandleMark hm(THREAD);
1121 
1122   Handle h_path = java_lang_String::create_from_str(path, CHECK);
1123 
1124   Symbol* sym = vmSymbols::jdk_internal_vm_ThreadDumper();
1125   Klass* k = SystemDictionary::resolve_or_fail(sym, true, CHECK);
1126   InstanceKlass* ik = InstanceKlass::cast(k);
1127   if (HAS_PENDING_EXCEPTION) {
1128     java_lang_Throwable::print(PENDING_EXCEPTION, output());
1129     output()->cr();
1130     CLEAR_PENDING_EXCEPTION;
1131     return;
1132   }
1133 
1134   // invoke the ThreadDump method to dump to file
1135   JavaValue result(T_OBJECT);
1136   JavaCallArguments args;
1137   args.push_oop(h_path);
1138   args.push_int(overwrite ? JNI_TRUE : JNI_FALSE);
1139   JavaCalls::call_static(&result,
1140                          k,
1141                          name,
1142                          signature,
1143                          &args,
1144                          THREAD);
1145   if (HAS_PENDING_EXCEPTION) {
1146     java_lang_Throwable::print(PENDING_EXCEPTION, output());
1147     output()->cr();
1148     CLEAR_PENDING_EXCEPTION;
1149     return;
1150   }
1151 
1152   // check that result is byte array
1153   oop res = cast_to_oop(result.get_jobject());
1154   assert(res->is_typeArray(), "just checking");
1155   assert(TypeArrayKlass::cast(res->klass())->element_type() == T_BYTE, "just checking");
1156 
1157   // copy the bytes to the output stream
1158   typeArrayOop ba = typeArrayOop(res);
1159   jbyte* addr = typeArrayOop(res)->byte_at_addr(0);
1160   output()->print_raw((const char*)addr, ba->length());
1161 }
1162 
1163 CompilationMemoryStatisticDCmd::CompilationMemoryStatisticDCmd(outputStream* output, bool heap) :
1164     DCmdWithParser(output, heap),
1165   _human_readable("-H", "Human readable format", "BOOLEAN", false, "false"),
1166   _minsize("-s", "Minimum memory size", "MEMORY SIZE", false, "0") {
1167   _dcmdparser.add_dcmd_option(&_human_readable);
1168   _dcmdparser.add_dcmd_option(&_minsize);
1169 }
1170 
1171 void CompilationMemoryStatisticDCmd::execute(DCmdSource source, TRAPS) {
1172   const bool human_readable = _human_readable.value();
1173   const size_t minsize = _minsize.has_value() ? _minsize.value()._size : 0;
1174   CompilationMemoryStatistic::print_all_by_size(output(), human_readable, minsize);
1175 }
1176 
1177 #if defined(LINUX) || defined(_WIN64)
1178 
1179 SystemMapDCmd::SystemMapDCmd(outputStream* output, bool heap) : DCmd(output, heap) {}
1180 
1181 void SystemMapDCmd::execute(DCmdSource source, TRAPS) {
1182   MemMapPrinter::print_all_mappings(output());
1183 }
1184 
1185 static constexpr char default_filename[] = "vm_memory_map_%p.txt";
1186 
1187 SystemDumpMapDCmd::SystemDumpMapDCmd(outputStream* output, bool heap) :
1188   DCmdWithParser(output, heap),
1189   _filename("-F", "file path", "FILE", false, default_filename) {
1190   _dcmdparser.add_dcmd_option(&_filename);
1191 }
1192 
1193 void SystemDumpMapDCmd::execute(DCmdSource source, TRAPS) {
1194   const char* name = _filename.value();
1195   if (name == nullptr || name[0] == 0) {
1196     output()->print_cr("filename is empty or not specified.  No file written");
1197     return;
1198   }
1199   fileStream fs(name);
1200   if (fs.is_open()) {
1201     if (!MemTracker::enabled()) {
1202       output()->print_cr("(NMT is disabled, will not annotate mappings).");
1203     }
1204     MemMapPrinter::print_all_mappings(&fs);
1205 #ifndef _WIN64
1206     // For the readers convenience, resolve path name.
1207     char tmp[JVM_MAXPATHLEN];
1208     const char* absname = os::Posix::realpath(name, tmp, sizeof(tmp));
1209     name = absname != nullptr ? absname : name;
1210 #endif
1211     output()->print_cr("Memory map dumped to \"%s\".", name);
1212   } else {
1213     output()->print_cr("Failed to open \"%s\" for writing (%s).", name, os::strerror(errno));
1214   }
1215 }
1216 
1217 #endif // LINUX