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