1 /* 2 * Copyright (c) 1997, 2025, 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 #ifndef SHARE_RUNTIME_ARGUMENTS_HPP 26 #define SHARE_RUNTIME_ARGUMENTS_HPP 27 28 #include "logging/logLevel.hpp" 29 #include "logging/logTag.hpp" 30 #include "memory/allStatic.hpp" 31 #include "memory/allocation.hpp" 32 #include "runtime/globals.hpp" 33 #include "runtime/java.hpp" 34 #include "runtime/os.hpp" 35 #include "utilities/debug.hpp" 36 #include "utilities/vmEnums.hpp" 37 38 // Arguments parses the command line and recognizes options 39 40 class JVMFlag; 41 42 // Invocation API hook typedefs (these should really be defined in jni.h) 43 extern "C" { 44 typedef void (JNICALL *abort_hook_t)(void); 45 typedef void (JNICALL *exit_hook_t)(jint code); 46 typedef jint (JNICALL *vfprintf_hook_t)(FILE *fp, const char *format, va_list args) ATTRIBUTE_PRINTF(2, 0); 47 } 48 49 // Obsolete or deprecated -XX flag. 50 struct SpecialFlag { 51 const char* name; 52 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined"). 53 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined"). 54 JDK_Version expired_in; // When the option expires (or "undefined"). 55 }; 56 57 struct LegacyGCLogging { 58 const char* file; // null -> stdout 59 int lastFlag; // 0 not set; 1 -> -verbose:gc; 2 -> -Xloggc 60 }; 61 62 // PathString is used as: 63 // - the underlying value for a SystemProperty 64 // - the path portion of an --patch-module module/path pair 65 // - the string that represents the boot class path, Arguments::_boot_class_path. 66 class PathString : public CHeapObj<mtArguments> { 67 protected: 68 char* _value; 69 public: 70 char* value() const { return _value; } 71 72 // return false iff OOM && alloc_failmode == AllocFailStrategy::RETURN_NULL 73 bool set_value(const char *value, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM); 74 void append_value(const char *value); 75 76 PathString(const char* value); 77 ~PathString(); 78 79 // for JVM_ReadSystemPropertiesInfo 80 static int value_offset_in_bytes() { return (int)offset_of(PathString, _value); } 81 }; 82 83 // ModulePatchPath records the module/path pair as specified to --patch-module. 84 class ModulePatchPath : public CHeapObj<mtInternal> { 85 private: 86 char* _module_name; 87 PathString* _path; 88 public: 89 ModulePatchPath(const char* module_name, const char* path); 90 ~ModulePatchPath(); 91 92 inline const char* module_name() const { return _module_name; } 93 inline char* path_string() const { return _path->value(); } 94 inline void append_path(const char* path) { _path->append_value(path); } 95 }; 96 97 // Element describing System and User (-Dkey=value flags) defined property. 98 // 99 // An internal SystemProperty is one that has been removed in 100 // jdk.internal.VM.saveAndRemoveProperties, like jdk.boot.class.path.append. 101 // 102 class SystemProperty : public PathString { 103 private: 104 char* _key; 105 SystemProperty* _next; 106 bool _internal; 107 bool _writeable; 108 109 public: 110 // Accessors 111 char* value() const { return PathString::value(); } 112 const char* key() const { return _key; } 113 bool internal() const { return _internal; } 114 SystemProperty* next() const { return _next; } 115 void set_next(SystemProperty* next) { _next = next; } 116 bool writeable() const { return _writeable; } 117 118 bool readable() const { 119 return !_internal || (strcmp(_key, "jdk.boot.class.path.append") == 0 && 120 value() != nullptr); 121 } 122 123 // A system property should only have its value set 124 // via an external interface if it is a writeable property. 125 // The internal, non-writeable property jdk.boot.class.path.append 126 // is the only exception to this rule. It can be set externally 127 // via -Xbootclasspath/a or JVMTI OnLoad phase call to AddToBootstrapClassLoaderSearch. 128 // In those cases for jdk.boot.class.path.append, the base class 129 // set_value and append_value methods are called directly. 130 void set_writeable_value(const char *value) { 131 if (writeable()) { 132 set_value(value); 133 } 134 } 135 void append_writeable_value(const char *value) { 136 if (writeable()) { 137 append_value(value); 138 } 139 } 140 141 // Constructor 142 SystemProperty(const char* key, const char* value, bool writeable, bool internal = false); 143 144 // for JVM_ReadSystemPropertiesInfo 145 static int key_offset_in_bytes() { return (int)offset_of(SystemProperty, _key); } 146 static int next_offset_in_bytes() { return (int)offset_of(SystemProperty, _next); } 147 }; 148 149 // Helper class for controlling the lifetime of JavaVMInitArgs objects. 150 class ScopedVMInitArgs; 151 152 struct VMInitArgsGroup; 153 template <typename E, MemTag MT> class GrowableArrayCHeap; 154 155 class Arguments : AllStatic { 156 friend class VMStructs; 157 friend class JvmtiExport; 158 friend class ArgumentsTest; 159 friend class LargeOptionsTest; 160 public: 161 // Operation modi 162 enum Mode { 163 _int, // corresponds to -Xint 164 _mixed, // corresponds to -Xmixed 165 _comp // corresponds to -Xcomp 166 }; 167 168 enum ArgsRange { 169 arg_unreadable = -3, 170 arg_too_small = -2, 171 arg_too_big = -1, 172 arg_in_range = 0 173 }; 174 175 enum PropertyAppendable { 176 AppendProperty, 177 AddProperty 178 }; 179 180 enum PropertyWriteable { 181 WriteableProperty, 182 UnwriteableProperty 183 }; 184 185 enum PropertyInternal { 186 InternalProperty, 187 ExternalProperty 188 }; 189 190 private: 191 192 // a pointer to the flags file name if it is specified 193 static char* _jvm_flags_file; 194 // an array containing all flags specified in the .hotspotrc file 195 static char** _jvm_flags_array; 196 static int _num_jvm_flags; 197 // an array containing all jvm arguments specified in the command line 198 static char** _jvm_args_array; 199 static int _num_jvm_args; 200 // string containing all java command (class/jarfile name and app args) 201 static char* _java_command; 202 // number of unique modules specified in the --add-modules option 203 static unsigned int _addmods_count; 204 #if INCLUDE_JVMCI 205 // was jdk.internal.vm.ci module specified in the --add-modules option? 206 static bool _jvmci_module_added; 207 #endif 208 209 // Property list 210 static SystemProperty* _system_properties; 211 212 // Quick accessor to System properties in the list: 213 static SystemProperty *_sun_boot_library_path; 214 static SystemProperty *_java_library_path; 215 static SystemProperty *_java_home; 216 static SystemProperty *_java_class_path; 217 static SystemProperty *_jdk_boot_class_path_append; 218 static SystemProperty *_vm_info; 219 220 // --patch-module=module=<file>(<pathsep><file>)* 221 // Each element contains the associated module name, path 222 // string pair as specified to --patch-module. 223 static GrowableArray<ModulePatchPath*>* _patch_mod_prefix; 224 225 // The constructed value of the system class path after 226 // argument processing and JVMTI OnLoad additions via 227 // calls to AddToBootstrapClassLoaderSearch. This is the 228 // final form before ClassLoader::setup_bootstrap_search(). 229 // Note: since --patch-module is a module name/path pair, the 230 // boot class path string no longer contains the "prefix" 231 // to the boot class path base piece as it did when 232 // -Xbootclasspath/p was supported. 233 static PathString* _boot_class_path; 234 235 // Set if a modular java runtime image is present vs. a build with exploded modules 236 static bool _has_jimage; 237 238 // temporary: to emit warning if the default ext dirs are not empty. 239 // remove this variable when the warning is no longer needed. 240 static char* _ext_dirs; 241 242 // java.vendor.url.bug, bug reporting URL for fatal errors. 243 static const char* _java_vendor_url_bug; 244 245 // sun.java.launcher, private property to provide information about 246 // java launcher 247 static const char* _sun_java_launcher; 248 249 // was this VM created with the -XX:+ExecutingUnitTests option 250 static bool _executing_unit_tests; 251 252 // for legacy gc options (-verbose:gc and -Xloggc:) 253 static LegacyGCLogging _legacyGCLogging; 254 255 // Value of the conservative maximum heap alignment needed 256 static size_t _conservative_max_heap_alignment; 257 258 // Operation modi 259 static Mode _mode; 260 261 // preview features 262 static bool _enable_preview; 263 264 // jdwp 265 static bool _has_jdwp_agent; 266 267 // Used to save default settings 268 static bool _AlwaysCompileLoopMethods; 269 static bool _UseOnStackReplacement; 270 static bool _BackgroundCompilation; 271 static bool _ClipInlining; 272 273 // GC ergonomics 274 static void set_conservative_max_heap_alignment(); 275 static void set_use_compressed_oops(); 276 static jint set_ergonomics_flags(); 277 static void set_compact_headers_flags(); 278 // Limits the given heap size by the maximum amount of virtual 279 // memory this process is currently allowed to use. It also takes 280 // the virtual-to-physical ratio of the current GC into account. 281 static size_t limit_heap_by_allocatable_memory(size_t size); 282 // Setup heap size 283 static void set_heap_size(); 284 285 // Bytecode rewriting 286 static void set_bytecode_flags(); 287 288 // Invocation API hooks 289 static abort_hook_t _abort_hook; 290 static exit_hook_t _exit_hook; 291 static vfprintf_hook_t _vfprintf_hook; 292 293 // System properties 294 static bool add_property(const char* prop, PropertyWriteable writeable=WriteableProperty, 295 PropertyInternal internal=ExternalProperty); 296 297 // Used for module system related properties: converted from command-line flags. 298 // Basic properties are writeable as they operate as "last one wins" and will get overwritten. 299 // Numbered properties are never writeable, and always internal. 300 static bool create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal); 301 static bool create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count); 302 303 static int process_patch_mod_option(const char* patch_mod_tail); 304 305 // Aggressive optimization flags. 306 static jint set_aggressive_opts_flags(); 307 308 static jint set_aggressive_heap_flags(); 309 310 // Argument parsing 311 static bool parse_argument(const char* arg, JVMFlagOrigin origin); 312 static bool process_argument(const char* arg, jboolean ignore_unrecognized, JVMFlagOrigin origin); 313 static void process_java_launcher_argument(const char*, void*); 314 static jint parse_options_environment_variable(const char* name, ScopedVMInitArgs* vm_args); 315 static jint parse_java_tool_options_environment_variable(ScopedVMInitArgs* vm_args); 316 static jint parse_java_options_environment_variable(ScopedVMInitArgs* vm_args); 317 static jint parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args, 318 ScopedVMInitArgs* jdk_aot_vm_options_args); 319 static jint parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args); 320 static jint parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args); 321 static jint parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize); 322 static jint insert_vm_options_file(const JavaVMInitArgs* args, 323 const char* vm_options_file, 324 const int vm_options_file_pos, 325 ScopedVMInitArgs* vm_options_file_args, 326 ScopedVMInitArgs* args_out); 327 static bool args_contains_vm_options_file_arg(const JavaVMInitArgs* args); 328 static jint expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 329 ScopedVMInitArgs* mod_args, 330 JavaVMInitArgs** args_out); 331 static jint match_special_option_and_act(const JavaVMInitArgs* args, 332 ScopedVMInitArgs* args_out); 333 334 static bool handle_deprecated_print_gc_flags(); 335 336 static jint parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args); 337 static jint parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin); 338 static jint finalize_vm_init_args(); 339 static bool is_bad_option(const JavaVMOption* option, jboolean ignore, const char* option_type); 340 341 static bool is_bad_option(const JavaVMOption* option, jboolean ignore) { 342 return is_bad_option(option, ignore, nullptr); 343 } 344 345 static void describe_range_error(ArgsRange errcode); 346 static ArgsRange check_memory_size(julong size, julong min_size, julong max_size); 347 static ArgsRange parse_memory_size(const char* s, julong* long_arg, 348 julong min_size, julong max_size = max_uintx); 349 350 // methods to build strings from individual args 351 static void build_jvm_args(const char* arg); 352 static void build_jvm_flags(const char* arg); 353 static void add_string(char*** bldarray, int* count, const char* arg); 354 static const char* build_resource_string(char** args, int count); 355 356 // Returns true if the flag is obsolete (and not yet expired). 357 // In this case the 'version' buffer is filled in with 358 // the version number when the flag became obsolete. 359 static bool is_obsolete_flag(const char* flag_name, JDK_Version* version); 360 361 // Returns 1 if the flag is deprecated (and not yet obsolete or expired). 362 // In this case the 'version' buffer is filled in with the version number when 363 // the flag became deprecated. 364 // Returns -1 if the flag is expired or obsolete. 365 // Returns 0 otherwise. 366 static int is_deprecated_flag(const char* flag_name, JDK_Version* version); 367 368 // Return the real name for the flag passed on the command line (either an alias name or "flag_name"). 369 static const char* real_flag_name(const char *flag_name); 370 static JVMFlag* find_jvm_flag(const char* name, size_t name_length); 371 372 // Return the "real" name for option arg if arg is an alias, and print a warning if arg is deprecated. 373 // Return nullptr if the arg has expired. 374 static const char* handle_aliases_and_deprecation(const char* arg); 375 static size_t _default_SharedBaseAddress; // The default value specified in globals.hpp 376 377 static bool internal_module_property_helper(const char* property, bool check_for_cds); 378 379 public: 380 // Parses the arguments, first phase 381 static jint parse(const JavaVMInitArgs* args); 382 // Parse a string for a unsigned integer. Returns true if value 383 // is an unsigned integer greater than or equal to the minimum 384 // parameter passed and returns the value in uint_arg. Returns 385 // false otherwise, with uint_arg undefined. 386 static bool parse_uint(const char* value, uint* uintx_arg, 387 uint min_size); 388 // Apply ergonomics 389 static jint apply_ergo(); 390 // Adjusts the arguments after the OS have adjusted the arguments 391 static jint adjust_after_os(); 392 393 // Check consistency or otherwise of VM argument settings 394 static bool check_vm_args_consistency(); 395 // Used by os_solaris 396 static bool process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized); 397 398 static size_t conservative_max_heap_alignment() { return _conservative_max_heap_alignment; } 399 // Return the maximum size a heap with compressed oops can take 400 static size_t max_heap_for_compressed_oops(); 401 402 // return a char* array containing all options 403 static char** jvm_flags_array() { return _jvm_flags_array; } 404 static char** jvm_args_array() { return _jvm_args_array; } 405 static int num_jvm_flags() { return _num_jvm_flags; } 406 static int num_jvm_args() { return _num_jvm_args; } 407 // return the arguments passed to the Java application 408 static const char* java_command() { return _java_command; } 409 410 // print jvm_flags, jvm_args and java_command 411 static void print_on(outputStream* st); 412 static void print_summary_on(outputStream* st); 413 414 // convenient methods to get and set jvm_flags_file 415 static const char* get_jvm_flags_file() { return _jvm_flags_file; } 416 static void set_jvm_flags_file(const char *value) { 417 if (_jvm_flags_file != nullptr) { 418 os::free(_jvm_flags_file); 419 } 420 _jvm_flags_file = os::strdup_check_oom(value); 421 } 422 // convenient methods to obtain / print jvm_flags and jvm_args 423 static const char* jvm_flags() { return build_resource_string(_jvm_flags_array, _num_jvm_flags); } 424 static const char* jvm_args() { return build_resource_string(_jvm_args_array, _num_jvm_args); } 425 static void print_jvm_flags_on(outputStream* st); 426 static void print_jvm_args_on(outputStream* st); 427 428 // -Dkey=value flags 429 static SystemProperty* system_properties() { return _system_properties; } 430 static const char* get_property(const char* key); 431 432 // -Djava.vendor.url.bug 433 static const char* java_vendor_url_bug() { return _java_vendor_url_bug; } 434 435 // -Dsun.java.launcher 436 static const char* sun_java_launcher() { return _sun_java_launcher; } 437 // Was VM created by a Java launcher? 438 static bool created_by_java_launcher(); 439 // -XX:+ExecutingUnitTests 440 static bool executing_unit_tests(); 441 442 // abort, exit, vfprintf hooks 443 static abort_hook_t abort_hook() { return _abort_hook; } 444 static exit_hook_t exit_hook() { return _exit_hook; } 445 static vfprintf_hook_t vfprintf_hook() { return _vfprintf_hook; } 446 447 static void no_shared_spaces(const char* message); 448 static size_t default_SharedBaseAddress() { return _default_SharedBaseAddress; } 449 // Java launcher properties 450 static void process_sun_java_launcher_properties(JavaVMInitArgs* args); 451 452 // System properties 453 static void init_system_properties(); 454 455 // Update/Initialize System properties after JDK version number is known 456 static void init_version_specific_system_properties(); 457 458 // Update VM info property - called after argument parsing 459 static void update_vm_info_property(const char* vm_info) { 460 _vm_info->set_value(vm_info); 461 } 462 463 // Property List manipulation 464 static void PropertyList_add(SystemProperty *element); 465 static void PropertyList_add(SystemProperty** plist, SystemProperty *element); 466 static void PropertyList_add(SystemProperty** plist, const char* k, const char* v, bool writeable, bool internal); 467 468 static void PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 469 PropertyAppendable append, PropertyWriteable writeable, 470 PropertyInternal internal); 471 static const char* PropertyList_get_value(SystemProperty* plist, const char* key); 472 static const char* PropertyList_get_readable_value(SystemProperty* plist, const char* key); 473 static int PropertyList_count(SystemProperty* pl); 474 static int PropertyList_readable_count(SystemProperty* pl); 475 476 static bool is_internal_module_property(const char* option); 477 static bool is_incompatible_cds_internal_module_property(const char* property); 478 static bool patching_migrated_classes(const char* property, const char* value); 479 480 // Miscellaneous System property value getter and setters. 481 static void set_dll_dir(const char *value) { _sun_boot_library_path->set_value(value); } 482 static void set_java_home(const char *value) { _java_home->set_value(value); } 483 static void set_library_path(const char *value) { _java_library_path->set_value(value); } 484 static void set_ext_dirs(char *value) { _ext_dirs = os::strdup_check_oom(value); } 485 486 // Set up the underlying pieces of the boot class path 487 static void add_patch_mod_prefix(const char *module_name, const char *path, bool allow_append, bool allow_cds); 488 static int finalize_patch_module(); 489 static void set_boot_class_path(const char *value, bool has_jimage) { 490 // During start up, set by os::set_boot_path() 491 assert(get_boot_class_path() == nullptr, "Boot class path previously set"); 492 _boot_class_path->set_value(value); 493 _has_jimage = has_jimage; 494 } 495 static void append_sysclasspath(const char *value) { 496 _boot_class_path->append_value(value); 497 _jdk_boot_class_path_append->append_value(value); 498 } 499 500 static GrowableArray<ModulePatchPath*>* get_patch_mod_prefix() { return _patch_mod_prefix; } 501 static char* get_boot_class_path() { return _boot_class_path->value(); } 502 static bool has_jimage() { return _has_jimage; } 503 504 static char* get_java_home() { return _java_home->value(); } 505 static char* get_dll_dir() { return _sun_boot_library_path->value(); } 506 static char* get_appclasspath() { return _java_class_path->value(); } 507 static void fix_appclasspath(); 508 509 // Operation modi 510 static Mode mode() { return _mode; } 511 static void set_mode_flags(Mode mode); 512 static bool is_interpreter_only() { return mode() == _int; } 513 static bool is_compiler_only() { return mode() == _comp; } 514 515 516 // preview features 517 static void set_enable_preview() { _enable_preview = true; } 518 static bool enable_preview() { return _enable_preview; } 519 520 // jdwp 521 static bool has_jdwp_agent() { return _has_jdwp_agent; } 522 523 // Utility: copies src into buf, replacing "%%" with "%" and "%p" with pid. 524 static bool copy_expand_pid(const char* src, size_t srclen, char* buf, size_t buflen); 525 526 static bool atojulong(const char *s, julong* result); 527 528 static bool has_jfr_option() NOT_JFR_RETURN_(false); 529 530 DEBUG_ONLY(static bool verify_special_jvm_flags(bool check_globals);) 531 }; 532 533 // Disable options not supported in this release, with a warning if they 534 // were explicitly requested on the command-line 535 #define UNSUPPORTED_OPTION(opt) \ 536 do { \ 537 if (opt) { \ 538 if (FLAG_IS_CMDLINE(opt)) { \ 539 warning("-XX:+" #opt " not supported in this VM"); \ 540 } \ 541 FLAG_SET_DEFAULT(opt, false); \ 542 } \ 543 } while(0) 544 545 // similar to UNSUPPORTED_OPTION but sets flag to nullptr 546 #define UNSUPPORTED_OPTION_NULL(opt) \ 547 do { \ 548 if (opt) { \ 549 if (FLAG_IS_CMDLINE(opt)) { \ 550 warning("-XX flag " #opt " not supported in this VM"); \ 551 } \ 552 FLAG_SET_DEFAULT(opt, nullptr); \ 553 } \ 554 } while(0) 555 556 // Initialize options not supported in this release, with a warning 557 // if they were explicitly requested on the command-line 558 #define UNSUPPORTED_OPTION_INIT(opt, value) \ 559 do { \ 560 if (FLAG_IS_CMDLINE(opt)) { \ 561 warning("-XX flag " #opt " not supported in this VM"); \ 562 } \ 563 FLAG_SET_DEFAULT(opt, value); \ 564 } while(0) 565 566 #endif // SHARE_RUNTIME_ARGUMENTS_HPP