1 /*
  2  * Copyright (c) 1997, 2021, 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/allocation.hpp"
 31 #include "runtime/globals.hpp"
 32 #include "runtime/java.hpp"
 33 #include "runtime/os.hpp"
 34 #include "utilities/debug.hpp"
 35 #include "utilities/vmEnums.hpp"
 36 
 37 // Arguments parses the command line and recognizes options
 38 
 39 // Invocation API hook typedefs (these should really be defined in jni.h)
 40 extern "C" {
 41   typedef void (JNICALL *abort_hook_t)(void);
 42   typedef void (JNICALL *exit_hook_t)(jint code);
 43   typedef jint (JNICALL *vfprintf_hook_t)(FILE *fp, const char *format, va_list args)  ATTRIBUTE_PRINTF(2, 0);
 44 }
 45 
 46 // Obsolete or deprecated -XX flag.
 47 struct SpecialFlag {
 48   const char* name;
 49   JDK_Version deprecated_in; // When the deprecation warning started (or "undefined").
 50   JDK_Version obsolete_in;   // When the obsolete warning started (or "undefined").
 51   JDK_Version expired_in;    // When the option expires (or "undefined").
 52 };
 53 
 54 struct LegacyGCLogging {
 55     const char* file;        // NULL -> stdout
 56     int lastFlag;            // 0 not set; 1 -> -verbose:gc; 2 -> -Xloggc
 57 };
 58 
 59 // PathString is used as:
 60 //  - the underlying value for a SystemProperty
 61 //  - the path portion of an --patch-module module/path pair
 62 //  - the string that represents the system boot class path, Arguments::_system_boot_class_path.
 63 class PathString : public CHeapObj<mtArguments> {
 64  protected:
 65   char* _value;
 66  public:
 67   char* value() const { return _value; }
 68 
 69   bool set_value(const char *value);
 70   void append_value(const char *value);
 71 
 72   PathString(const char* value);
 73   ~PathString();
 74 };
 75 
 76 // ModulePatchPath records the module/path pair as specified to --patch-module.
 77 class ModulePatchPath : public CHeapObj<mtInternal> {
 78 private:
 79   char* _module_name;
 80   PathString* _path;
 81 public:
 82   ModulePatchPath(const char* module_name, const char* path);
 83   ~ModulePatchPath();
 84 
 85   inline void set_path(const char* path) { _path->set_value(path); }
 86   inline const char* module_name() const { return _module_name; }
 87   inline char* path_string() const { return _path->value(); }
 88 };
 89 
 90 // Element describing System and User (-Dkey=value flags) defined property.
 91 //
 92 // An internal SystemProperty is one that has been removed in
 93 // jdk.internal.VM.saveAndRemoveProperties, like jdk.boot.class.path.append.
 94 //
 95 class SystemProperty : public PathString {
 96  private:
 97   char*           _key;
 98   SystemProperty* _next;
 99   bool            _internal;
100   bool            _writeable;
101   bool writeable() { return _writeable; }
102 
103  public:
104   // Accessors
105   char* value() const                 { return PathString::value(); }
106   const char* key() const             { return _key; }
107   bool internal() const               { return _internal; }
108   SystemProperty* next() const        { return _next; }
109   void set_next(SystemProperty* next) { _next = next; }
110 
111   bool is_readable() const {
112     return !_internal || (strcmp(_key, "jdk.boot.class.path.append") == 0 &&
113                           value() != NULL);
114   }
115 
116   // A system property should only have its value set
117   // via an external interface if it is a writeable property.
118   // The internal, non-writeable property jdk.boot.class.path.append
119   // is the only exception to this rule.  It can be set externally
120   // via -Xbootclasspath/a or JVMTI OnLoad phase call to AddToBootstrapClassLoaderSearch.
121   // In those cases for jdk.boot.class.path.append, the base class
122   // set_value and append_value methods are called directly.
123   bool set_writeable_value(const char *value) {
124     if (writeable()) {
125       return set_value(value);
126     }
127     return false;
128   }
129   void append_writeable_value(const char *value) {
130     if (writeable()) {
131       append_value(value);
132     }
133   }
134 
135   // Constructor
136   SystemProperty(const char* key, const char* value, bool writeable, bool internal = false);
137 };
138 
139 
140 // For use by -agentlib, -agentpath and -Xrun
141 class AgentLibrary : public CHeapObj<mtArguments> {
142   friend class AgentLibraryList;
143 public:
144   // Is this library valid or not. Don't rely on os_lib == NULL as statically
145   // linked lib could have handle of RTLD_DEFAULT which == 0 on some platforms
146   enum AgentState {
147     agent_invalid = 0,
148     agent_valid   = 1
149   };
150 
151  private:
152   char*           _name;
153   char*           _options;
154   void*           _os_lib;
155   bool            _is_absolute_path;
156   bool            _is_static_lib;
157   bool            _is_instrument_lib;
158   AgentState      _state;
159   AgentLibrary*   _next;
160 
161  public:
162   // Accessors
163   const char* name() const                  { return _name; }
164   char* options() const                     { return _options; }
165   bool is_absolute_path() const             { return _is_absolute_path; }
166   void* os_lib() const                      { return _os_lib; }
167   void set_os_lib(void* os_lib)             { _os_lib = os_lib; }
168   AgentLibrary* next() const                { return _next; }
169   bool is_static_lib() const                { return _is_static_lib; }
170   bool is_instrument_lib() const            { return _is_instrument_lib; }
171   void set_static_lib(bool is_static_lib)   { _is_static_lib = is_static_lib; }
172   bool valid()                              { return (_state == agent_valid); }
173   void set_valid()                          { _state = agent_valid; }
174   void set_invalid()                        { _state = agent_invalid; }
175 
176   // Constructor
177   AgentLibrary(const char* name, const char* options, bool is_absolute_path,
178                void* os_lib, bool instrument_lib=false);
179 };
180 
181 // maintain an order of entry list of AgentLibrary
182 class AgentLibraryList {
183  private:
184   AgentLibrary*   _first;
185   AgentLibrary*   _last;
186  public:
187   bool is_empty() const                     { return _first == NULL; }
188   AgentLibrary* first() const               { return _first; }
189 
190   // add to the end of the list
191   void add(AgentLibrary* lib) {
192     if (is_empty()) {
193       _first = _last = lib;
194     } else {
195       _last->_next = lib;
196       _last = lib;
197     }
198     lib->_next = NULL;
199   }
200 
201   // search for and remove a library known to be in the list
202   void remove(AgentLibrary* lib) {
203     AgentLibrary* curr;
204     AgentLibrary* prev = NULL;
205     for (curr = first(); curr != NULL; prev = curr, curr = curr->next()) {
206       if (curr == lib) {
207         break;
208       }
209     }
210     assert(curr != NULL, "always should be found");
211 
212     if (curr != NULL) {
213       // it was found, by-pass this library
214       if (prev == NULL) {
215         _first = curr->_next;
216       } else {
217         prev->_next = curr->_next;
218       }
219       if (curr == _last) {
220         _last = prev;
221       }
222       curr->_next = NULL;
223     }
224   }
225 
226   AgentLibraryList() {
227     _first = NULL;
228     _last = NULL;
229   }
230 };
231 
232 // Helper class for controlling the lifetime of JavaVMInitArgs objects.
233 class ScopedVMInitArgs;
234 
235 class Arguments : AllStatic {
236   friend class VMStructs;
237   friend class JvmtiExport;
238   friend class CodeCacheExtensions;
239   friend class ArgumentsTest;
240  public:
241   // Operation modi
242   enum Mode {
243     _int,       // corresponds to -Xint
244     _mixed,     // corresponds to -Xmixed
245     _comp       // corresponds to -Xcomp
246   };
247 
248   enum ArgsRange {
249     arg_unreadable = -3,
250     arg_too_small  = -2,
251     arg_too_big    = -1,
252     arg_in_range   = 0
253   };
254 
255   enum PropertyAppendable {
256     AppendProperty,
257     AddProperty
258   };
259 
260   enum PropertyWriteable {
261     WriteableProperty,
262     UnwriteableProperty
263   };
264 
265   enum PropertyInternal {
266     InternalProperty,
267     ExternalProperty
268   };
269 
270  private:
271 
272   // a pointer to the flags file name if it is specified
273   static char*  _jvm_flags_file;
274   // an array containing all flags specified in the .hotspotrc file
275   static char** _jvm_flags_array;
276   static int    _num_jvm_flags;
277   // an array containing all jvm arguments specified in the command line
278   static char** _jvm_args_array;
279   static int    _num_jvm_args;
280   // string containing all java command (class/jarfile name and app args)
281   static char* _java_command;
282 
283   // Property list
284   static SystemProperty* _system_properties;
285 
286   // Quick accessor to System properties in the list:
287   static SystemProperty *_sun_boot_library_path;
288   static SystemProperty *_java_library_path;
289   static SystemProperty *_java_home;
290   static SystemProperty *_java_class_path;
291   static SystemProperty *_jdk_boot_class_path_append;
292   static SystemProperty *_vm_info;
293 
294   // --patch-module=module=<file>(<pathsep><file>)*
295   // Each element contains the associated module name, path
296   // string pair as specified to --patch-module.
297   static GrowableArray<ModulePatchPath*>* _patch_mod_prefix;
298 
299   // The constructed value of the system class path after
300   // argument processing and JVMTI OnLoad additions via
301   // calls to AddToBootstrapClassLoaderSearch.  This is the
302   // final form before ClassLoader::setup_bootstrap_search().
303   // Note: since --patch-module is a module name/path pair, the
304   // system boot class path string no longer contains the "prefix"
305   // to the boot class path base piece as it did when
306   // -Xbootclasspath/p was supported.
307   static PathString *_system_boot_class_path;
308 
309   // Set if a modular java runtime image is present vs. a build with exploded modules
310   static bool _has_jimage;
311 
312   // temporary: to emit warning if the default ext dirs are not empty.
313   // remove this variable when the warning is no longer needed.
314   static char* _ext_dirs;
315 
316   // java.vendor.url.bug, bug reporting URL for fatal errors.
317   static const char* _java_vendor_url_bug;
318 
319   // sun.java.launcher, private property to provide information about
320   // java launcher
321   static const char* _sun_java_launcher;
322 
323   // was this VM created via the -XXaltjvm=<path> option
324   static bool   _sun_java_launcher_is_altjvm;
325 
326   // for legacy gc options (-verbose:gc and -Xloggc:)
327   static LegacyGCLogging _legacyGCLogging;
328 
329   // Value of the conservative maximum heap alignment needed
330   static size_t  _conservative_max_heap_alignment;
331 
332   // -Xrun arguments
333   static AgentLibraryList _libraryList;
334   static void add_init_library(const char* name, char* options);
335 
336   // -agentlib and -agentpath arguments
337   static AgentLibraryList _agentList;
338   static void add_init_agent(const char* name, char* options, bool absolute_path);
339   static void add_instrument_agent(const char* name, char* options, bool absolute_path);
340 
341   // Late-binding agents not started via arguments
342   static void add_loaded_agent(AgentLibrary *agentLib);
343 
344   // Operation modi
345   static Mode _mode;
346   static void set_mode_flags(Mode mode);
347   static bool _java_compiler;
348   static void set_java_compiler(bool arg) { _java_compiler = arg; }
349   static bool java_compiler()   { return _java_compiler; }
350 
351   // -Xdebug flag
352   static bool _xdebug_mode;
353   static void set_xdebug_mode(bool arg) { _xdebug_mode = arg; }
354   static bool xdebug_mode()             { return _xdebug_mode; }
355 
356   // preview features
357   static bool _enable_preview;
358 
359   // Used to save default settings
360   static bool _AlwaysCompileLoopMethods;
361   static bool _UseOnStackReplacement;
362   static bool _BackgroundCompilation;
363   static bool _ClipInlining;
364 
365   // GC ergonomics
366   static void set_conservative_max_heap_alignment();
367   static void set_use_compressed_oops();
368   static void set_use_compressed_klass_ptrs();
369   static jint set_ergonomics_flags();
370   static void set_shared_spaces_flags_and_archive_paths();
371   // Limits the given heap size by the maximum amount of virtual
372   // memory this process is currently allowed to use. It also takes
373   // the virtual-to-physical ratio of the current GC into account.
374   static size_t limit_heap_by_allocatable_memory(size_t size);
375   // Setup heap size
376   static void set_heap_size();
377   static void set_use_chunk_bitmaps();
378 
379   // Bytecode rewriting
380   static void set_bytecode_flags();
381 
382   // Invocation API hooks
383   static abort_hook_t     _abort_hook;
384   static exit_hook_t      _exit_hook;
385   static vfprintf_hook_t  _vfprintf_hook;
386 
387   // System properties
388   static bool add_property(const char* prop, PropertyWriteable writeable=WriteableProperty,
389                            PropertyInternal internal=ExternalProperty);
390 
391   // Used for module system related properties: converted from command-line flags.
392   // Basic properties are writeable as they operate as "last one wins" and will get overwritten.
393   // Numbered properties are never writeable, and always internal.
394   static bool create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal);
395   static bool create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count);
396 
397   static int process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase);
398 
399   // Aggressive optimization flags.
400   static jint set_aggressive_opts_flags();
401 
402   static jint set_aggressive_heap_flags();
403 
404   // Argument parsing
405   static bool parse_argument(const char* arg, JVMFlagOrigin origin);
406   static bool process_argument(const char* arg, jboolean ignore_unrecognized, JVMFlagOrigin origin);
407   static void process_java_launcher_argument(const char*, void*);
408   static void process_java_compiler_argument(const char* arg);
409   static jint parse_options_environment_variable(const char* name, ScopedVMInitArgs* vm_args);
410   static jint parse_java_tool_options_environment_variable(ScopedVMInitArgs* vm_args);
411   static jint parse_java_options_environment_variable(ScopedVMInitArgs* vm_args);
412   static jint parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args);
413   static jint parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args);
414   static jint parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize);
415   static jint insert_vm_options_file(const JavaVMInitArgs* args,
416                                      const char* vm_options_file,
417                                      const int vm_options_file_pos,
418                                      ScopedVMInitArgs* vm_options_file_args,
419                                      ScopedVMInitArgs* args_out);
420   static bool args_contains_vm_options_file_arg(const JavaVMInitArgs* args);
421   static jint expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
422                                           ScopedVMInitArgs* mod_args,
423                                           JavaVMInitArgs** args_out);
424   static jint match_special_option_and_act(const JavaVMInitArgs* args,
425                                            ScopedVMInitArgs* args_out);
426 
427   static bool handle_deprecated_print_gc_flags();
428 
429   static jint parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
430                                  const JavaVMInitArgs *java_tool_options_args,
431                                  const JavaVMInitArgs *java_options_args,
432                                  const JavaVMInitArgs *cmd_line_args);
433   static jint parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin);
434   static jint finalize_vm_init_args(bool patch_mod_javabase);
435   static bool is_bad_option(const JavaVMOption* option, jboolean ignore, const char* option_type);
436 
437   static bool is_bad_option(const JavaVMOption* option, jboolean ignore) {
438     return is_bad_option(option, ignore, NULL);
439   }
440 
441   static void describe_range_error(ArgsRange errcode);
442   static ArgsRange check_memory_size(julong size, julong min_size, julong max_size);
443   static ArgsRange parse_memory_size(const char* s, julong* long_arg,
444                                      julong min_size, julong max_size = max_uintx);
445 
446   // methods to build strings from individual args
447   static void build_jvm_args(const char* arg);
448   static void build_jvm_flags(const char* arg);
449   static void add_string(char*** bldarray, int* count, const char* arg);
450   static const char* build_resource_string(char** args, int count);
451 
452   // Returns true if the flag is obsolete (and not yet expired).
453   // In this case the 'version' buffer is filled in with
454   // the version number when the flag became obsolete.
455   static bool is_obsolete_flag(const char* flag_name, JDK_Version* version);
456 
457   // Returns 1 if the flag is deprecated (and not yet obsolete or expired).
458   //     In this case the 'version' buffer is filled in with the version number when
459   //     the flag became deprecated.
460   // Returns -1 if the flag is expired or obsolete.
461   // Returns 0 otherwise.
462   static int is_deprecated_flag(const char* flag_name, JDK_Version* version);
463 
464   // Return the real name for the flag passed on the command line (either an alias name or "flag_name").
465   static const char* real_flag_name(const char *flag_name);
466 
467   // Return the "real" name for option arg if arg is an alias, and print a warning if arg is deprecated.
468   // Return NULL if the arg has expired.
469   static const char* handle_aliases_and_deprecation(const char* arg, bool warn);
470 
471   static char*  SharedArchivePath;
472   static char*  SharedDynamicArchivePath;
473   static size_t _default_SharedBaseAddress; // The default value specified in globals.hpp
474   static int num_archives(const char* archive_path) NOT_CDS_RETURN_(0);
475   static void extract_shared_archive_paths(const char* archive_path,
476                                          char** base_archive_path,
477                                          char** top_archive_path) NOT_CDS_RETURN;
478 
479  public:
480   // Parses the arguments, first phase
481   static jint parse(const JavaVMInitArgs* args);
482   // Parse a string for a unsigned integer.  Returns true if value
483   // is an unsigned integer greater than or equal to the minimum
484   // parameter passed and returns the value in uintx_arg.  Returns
485   // false otherwise, with uintx_arg undefined.
486   static bool parse_uintx(const char* value, uintx* uintx_arg,
487                           uintx min_size);
488   // Apply ergonomics
489   static jint apply_ergo();
490   // Adjusts the arguments after the OS have adjusted the arguments
491   static jint adjust_after_os();
492 
493   // Check consistency or otherwise of VM argument settings
494   static bool check_vm_args_consistency();
495   // Used by os_solaris
496   static bool process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized);
497 
498   static size_t conservative_max_heap_alignment() { return _conservative_max_heap_alignment; }
499   // Return the maximum size a heap with compressed oops can take
500   static size_t max_heap_for_compressed_oops();
501 
502   // return a char* array containing all options
503   static char** jvm_flags_array()          { return _jvm_flags_array; }
504   static char** jvm_args_array()           { return _jvm_args_array; }
505   static int num_jvm_flags()               { return _num_jvm_flags; }
506   static int num_jvm_args()                { return _num_jvm_args; }
507   // return the arguments passed to the Java application
508   static const char* java_command()        { return _java_command; }
509 
510   // print jvm_flags, jvm_args and java_command
511   static void print_on(outputStream* st);
512   static void print_summary_on(outputStream* st);
513 
514   // convenient methods to get and set jvm_flags_file
515   static const char* get_jvm_flags_file()  { return _jvm_flags_file; }
516   static void set_jvm_flags_file(const char *value) {
517     if (_jvm_flags_file != NULL) {
518       os::free(_jvm_flags_file);
519     }
520     _jvm_flags_file = os::strdup_check_oom(value);
521   }
522   // convenient methods to obtain / print jvm_flags and jvm_args
523   static const char* jvm_flags()           { return build_resource_string(_jvm_flags_array, _num_jvm_flags); }
524   static const char* jvm_args()            { return build_resource_string(_jvm_args_array, _num_jvm_args); }
525   static void print_jvm_flags_on(outputStream* st);
526   static void print_jvm_args_on(outputStream* st);
527 
528   // -Dkey=value flags
529   static SystemProperty*  system_properties()   { return _system_properties; }
530   static const char*    get_property(const char* key);
531 
532   // -Djava.vendor.url.bug
533   static const char* java_vendor_url_bug()  { return _java_vendor_url_bug; }
534 
535   // -Dsun.java.launcher
536   static const char* sun_java_launcher()    { return _sun_java_launcher; }
537   // Was VM created by a Java launcher?
538   static bool created_by_java_launcher();
539   // -Dsun.java.launcher.is_altjvm
540   static bool sun_java_launcher_is_altjvm();
541 
542   // -Xrun
543   static AgentLibrary* libraries()          { return _libraryList.first(); }
544   static bool init_libraries_at_startup()   { return !_libraryList.is_empty(); }
545   static void convert_library_to_agent(AgentLibrary* lib)
546                                             { _libraryList.remove(lib);
547                                               _agentList.add(lib); }
548 
549   // -agentlib -agentpath
550   static AgentLibrary* agents()             { return _agentList.first(); }
551   static bool init_agents_at_startup()      { return !_agentList.is_empty(); }
552 
553   // abort, exit, vfprintf hooks
554   static abort_hook_t    abort_hook()       { return _abort_hook; }
555   static exit_hook_t     exit_hook()        { return _exit_hook; }
556   static vfprintf_hook_t vfprintf_hook()    { return _vfprintf_hook; }
557 
558   static const char* GetSharedArchivePath() { return SharedArchivePath; }
559   static const char* GetSharedDynamicArchivePath() { return SharedDynamicArchivePath; }
560   static size_t default_SharedBaseAddress() { return _default_SharedBaseAddress; }
561   // Java launcher properties
562   static void process_sun_java_launcher_properties(JavaVMInitArgs* args);
563 
564   // System properties
565   static void init_system_properties();
566 
567   // Update/Initialize System properties after JDK version number is known
568   static void init_version_specific_system_properties();
569 
570   // Update VM info property - called after argument parsing
571   static void update_vm_info_property(const char* vm_info) {
572     _vm_info->set_value(vm_info);
573   }
574 
575   // Property List manipulation
576   static void PropertyList_add(SystemProperty *element);
577   static void PropertyList_add(SystemProperty** plist, SystemProperty *element);
578   static void PropertyList_add(SystemProperty** plist, const char* k, const char* v, bool writeable, bool internal);
579 
580   static void PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
581                                       PropertyAppendable append, PropertyWriteable writeable,
582                                       PropertyInternal internal);
583   static const char* PropertyList_get_value(SystemProperty* plist, const char* key);
584   static const char* PropertyList_get_readable_value(SystemProperty* plist, const char* key);
585   static int  PropertyList_count(SystemProperty* pl);
586   static int  PropertyList_readable_count(SystemProperty* pl);
587   static const char* PropertyList_get_key_at(SystemProperty* pl,int index);
588   static char* PropertyList_get_value_at(SystemProperty* pl,int index);
589 
590   static bool is_internal_module_property(const char* option);
591 
592   // Miscellaneous System property value getter and setters.
593   static void set_dll_dir(const char *value) { _sun_boot_library_path->set_value(value); }
594   static void set_java_home(const char *value) { _java_home->set_value(value); }
595   static void set_library_path(const char *value) { _java_library_path->set_value(value); }
596   static void set_ext_dirs(char *value)     { _ext_dirs = os::strdup_check_oom(value); }
597 
598   // Set up the underlying pieces of the system boot class path
599   static void add_patch_mod_prefix(const char *module_name, const char *path, bool* patch_mod_javabase);
600   static void set_sysclasspath(const char *value, bool has_jimage) {
601     // During start up, set by os::set_boot_path()
602     assert(get_sysclasspath() == NULL, "System boot class path previously set");
603     _system_boot_class_path->set_value(value);
604     _has_jimage = has_jimage;
605   }
606   static void append_sysclasspath(const char *value) {
607     _system_boot_class_path->append_value(value);
608     _jdk_boot_class_path_append->append_value(value);
609   }
610 
611   static GrowableArray<ModulePatchPath*>* get_patch_mod_prefix() { return _patch_mod_prefix; }
612   static char* get_sysclasspath() { return _system_boot_class_path->value(); }
613   static char* get_jdk_boot_class_path_append() { return _jdk_boot_class_path_append->value(); }
614   static bool has_jimage() { return _has_jimage; }
615 
616   static char* get_java_home()    { return _java_home->value(); }
617   static char* get_dll_dir()      { return _sun_boot_library_path->value(); }
618   static char* get_ext_dirs()     { return _ext_dirs;  }
619   static char* get_appclasspath() { return _java_class_path->value(); }
620   static void  fix_appclasspath();
621 
622   static char* get_default_shared_archive_path() NOT_CDS_RETURN_(NULL);
623   static void  init_shared_archive_paths() NOT_CDS_RETURN;
624 
625   // Operation modi
626   static Mode mode()                { return _mode;           }
627   static bool is_interpreter_only() { return mode() == _int;  }
628   static bool is_compiler_only()    { return mode() == _comp; }
629 
630 
631   // preview features
632   static void set_enable_preview() { _enable_preview = true; }
633   static bool enable_preview() { return _enable_preview; }
634 
635   // Utility: copies src into buf, replacing "%%" with "%" and "%p" with pid.
636   static bool copy_expand_pid(const char* src, size_t srclen, char* buf, size_t buflen);
637 
638   static void check_unsupported_dumping_properties() NOT_CDS_RETURN;
639 
640   static bool check_unsupported_cds_runtime_properties() NOT_CDS_RETURN0;
641 
642   static bool atojulong(const char *s, julong* result);
643 
644   static bool has_jfr_option() NOT_JFR_RETURN_(false);
645 
646   static bool is_dumping_archive() { return DumpSharedSpaces || DynamicDumpSharedSpaces; }
647 
648   static void assert_is_dumping_archive() {
649     assert(Arguments::is_dumping_archive(), "dump time only");
650   }
651 
652   DEBUG_ONLY(static bool verify_special_jvm_flags(bool check_globals);)
653 };
654 
655 // Disable options not supported in this release, with a warning if they
656 // were explicitly requested on the command-line
657 #define UNSUPPORTED_OPTION(opt)                          \
658 do {                                                     \
659   if (opt) {                                             \
660     if (FLAG_IS_CMDLINE(opt)) {                          \
661       warning("-XX:+" #opt " not supported in this VM"); \
662     }                                                    \
663     FLAG_SET_DEFAULT(opt, false);                        \
664   }                                                      \
665 } while(0)
666 
667 // similar to UNSUPPORTED_OPTION but sets flag to NULL
668 #define UNSUPPORTED_OPTION_NULL(opt)                     \
669 do {                                                     \
670   if (opt) {                                             \
671     if (FLAG_IS_CMDLINE(opt)) {                          \
672       warning("-XX flag " #opt " not supported in this VM"); \
673     }                                                    \
674     FLAG_SET_DEFAULT(opt, NULL);                         \
675   }                                                      \
676 } while(0)
677 
678 // Initialize options not supported in this release, with a warning
679 // if they were explicitly requested on the command-line
680 #define UNSUPPORTED_OPTION_INIT(opt, value)              \
681 do {                                                     \
682   if (FLAG_IS_CMDLINE(opt)) {                            \
683     warning("-XX flag " #opt " not supported in this VM"); \
684   }                                                      \
685   FLAG_SET_DEFAULT(opt, value);                          \
686 } while(0)
687 
688 #endif // SHARE_RUNTIME_ARGUMENTS_HPP