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   }
114 
115   // A system property should only have its value set
116   // via an external interface if it is a writeable property.
117   // The internal, non-writeable property jdk.boot.class.path.append
118   // is the only exception to this rule.  It can be set externally
119   // via -Xbootclasspath/a or JVMTI OnLoad phase call to AddToBootstrapClassLoaderSearch.
120   // In those cases for jdk.boot.class.path.append, the base class
121   // set_value and append_value methods are called directly.
122   bool set_writeable_value(const char *value) {
123     if (writeable()) {
124       return set_value(value);
125     }
126     return false;
127   }
128   void append_writeable_value(const char *value) {
129     if (writeable()) {
130       append_value(value);
131     }
132   }
133 
134   // Constructor
135   SystemProperty(const char* key, const char* value, bool writeable, bool internal = false);
136 };
137 
138 
139 // For use by -agentlib, -agentpath and -Xrun
140 class AgentLibrary : public CHeapObj<mtArguments> {
141   friend class AgentLibraryList;
142 public:
143   // Is this library valid or not. Don't rely on os_lib == NULL as statically
144   // linked lib could have handle of RTLD_DEFAULT which == 0 on some platforms
145   enum AgentState {
146     agent_invalid = 0,
147     agent_valid   = 1
148   };
149 
150  private:
151   char*           _name;
152   char*           _options;
153   void*           _os_lib;
154   bool            _is_absolute_path;
155   bool            _is_static_lib;
156   bool            _is_instrument_lib;
157   AgentState      _state;
158   AgentLibrary*   _next;
159 
160  public:
161   // Accessors
162   const char* name() const                  { return _name; }
163   char* options() const                     { return _options; }
164   bool is_absolute_path() const             { return _is_absolute_path; }
165   void* os_lib() const                      { return _os_lib; }
166   void set_os_lib(void* os_lib)             { _os_lib = os_lib; }
167   AgentLibrary* next() const                { return _next; }
168   bool is_static_lib() const                { return _is_static_lib; }
169   bool is_instrument_lib() const            { return _is_instrument_lib; }
170   void set_static_lib(bool is_static_lib)   { _is_static_lib = is_static_lib; }
171   bool valid()                              { return (_state == agent_valid); }
172   void set_valid()                          { _state = agent_valid; }
173   void set_invalid()                        { _state = agent_invalid; }
174 
175   // Constructor
176   AgentLibrary(const char* name, const char* options, bool is_absolute_path,
177                void* os_lib, bool instrument_lib=false);
178 };
179 
180 // maintain an order of entry list of AgentLibrary
181 class AgentLibraryList {
182  private:
183   AgentLibrary*   _first;
184   AgentLibrary*   _last;
185  public:
186   bool is_empty() const                     { return _first == NULL; }
187   AgentLibrary* first() const               { return _first; }
188 
189   // add to the end of the list
190   void add(AgentLibrary* lib) {
191     if (is_empty()) {
192       _first = _last = lib;
193     } else {
194       _last->_next = lib;
195       _last = lib;
196     }
197     lib->_next = NULL;
198   }
199 
200   // search for and remove a library known to be in the list
201   void remove(AgentLibrary* lib) {
202     AgentLibrary* curr;
203     AgentLibrary* prev = NULL;
204     for (curr = first(); curr != NULL; prev = curr, curr = curr->next()) {
205       if (curr == lib) {
206         break;
207       }
208     }
209     assert(curr != NULL, "always should be found");
210 
211     if (curr != NULL) {
212       // it was found, by-pass this library
213       if (prev == NULL) {
214         _first = curr->_next;
215       } else {
216         prev->_next = curr->_next;
217       }
218       if (curr == _last) {
219         _last = prev;
220       }
221       curr->_next = NULL;
222     }
223   }
224 
225   AgentLibraryList() {
226     _first = NULL;
227     _last = NULL;
228   }
229 };
230 
231 // Helper class for controlling the lifetime of JavaVMInitArgs objects.
232 class ScopedVMInitArgs;
233 
234 class Arguments : AllStatic {
235   friend class VMStructs;
236   friend class JvmtiExport;
237   friend class CodeCacheExtensions;
238   friend class ArgumentsTest;
239  public:
240   // Operation modi
241   enum Mode {
242     _int,       // corresponds to -Xint
243     _mixed,     // corresponds to -Xmixed
244     _comp       // corresponds to -Xcomp
245   };
246 
247   enum ArgsRange {
248     arg_unreadable = -3,
249     arg_too_small  = -2,
250     arg_too_big    = -1,
251     arg_in_range   = 0
252   };
253 
254   enum PropertyAppendable {
255     AppendProperty,
256     AddProperty
257   };
258 
259   enum PropertyWriteable {
260     WriteableProperty,
261     UnwriteableProperty
262   };
263 
264   enum PropertyInternal {
265     InternalProperty,
266     ExternalProperty
267   };
268 
269  private:
270 
271   // a pointer to the flags file name if it is specified
272   static char*  _jvm_flags_file;
273   // an array containing all flags specified in the .hotspotrc file
274   static char** _jvm_flags_array;
275   static int    _num_jvm_flags;
276   // an array containing all jvm arguments specified in the command line
277   static char** _jvm_args_array;
278   static int    _num_jvm_args;
279   // string containing all java command (class/jarfile name and app args)
280   static char* _java_command;
281 
282   // Property list
283   static SystemProperty* _system_properties;
284 
285   // Quick accessor to System properties in the list:
286   static SystemProperty *_sun_boot_library_path;
287   static SystemProperty *_java_library_path;
288   static SystemProperty *_java_home;
289   static SystemProperty *_java_class_path;
290   static SystemProperty *_jdk_boot_class_path_append;
291   static SystemProperty *_vm_info;
292 
293   // --patch-module=module=<file>(<pathsep><file>)*
294   // Each element contains the associated module name, path
295   // string pair as specified to --patch-module.
296   static GrowableArray<ModulePatchPath*>* _patch_mod_prefix;
297 
298   // The constructed value of the system class path after
299   // argument processing and JVMTI OnLoad additions via
300   // calls to AddToBootstrapClassLoaderSearch.  This is the
301   // final form before ClassLoader::setup_bootstrap_search().
302   // Note: since --patch-module is a module name/path pair, the
303   // system boot class path string no longer contains the "prefix"
304   // to the boot class path base piece as it did when
305   // -Xbootclasspath/p was supported.
306   static PathString *_system_boot_class_path;
307 
308   // Set if a modular java runtime image is present vs. a build with exploded modules
309   static bool _has_jimage;
310 
311   // temporary: to emit warning if the default ext dirs are not empty.
312   // remove this variable when the warning is no longer needed.
313   static char* _ext_dirs;
314 
315   // java.vendor.url.bug, bug reporting URL for fatal errors.
316   static const char* _java_vendor_url_bug;
317 
318   // sun.java.launcher, private property to provide information about
319   // java launcher
320   static const char* _sun_java_launcher;
321 
322   // was this VM created via the -XXaltjvm=<path> option
323   static bool   _sun_java_launcher_is_altjvm;
324 
325   // for legacy gc options (-verbose:gc and -Xloggc:)
326   static LegacyGCLogging _legacyGCLogging;
327 
328   // Value of the conservative maximum heap alignment needed
329   static size_t  _conservative_max_heap_alignment;
330 
331   // -Xrun arguments
332   static AgentLibraryList _libraryList;
333   static void add_init_library(const char* name, char* options);
334 
335   // -agentlib and -agentpath arguments
336   static AgentLibraryList _agentList;
337   static void add_init_agent(const char* name, char* options, bool absolute_path);
338   static void add_instrument_agent(const char* name, char* options, bool absolute_path);
339 
340   // Late-binding agents not started via arguments
341   static void add_loaded_agent(AgentLibrary *agentLib);
342 
343   // Operation modi
344   static Mode _mode;
345   static void set_mode_flags(Mode mode);
346   static bool _java_compiler;
347   static void set_java_compiler(bool arg) { _java_compiler = arg; }
348   static bool java_compiler()   { return _java_compiler; }
349 
350   // -Xdebug flag
351   static bool _xdebug_mode;
352   static void set_xdebug_mode(bool arg) { _xdebug_mode = arg; }
353   static bool xdebug_mode()             { return _xdebug_mode; }
354 
355   // preview features
356   static bool _enable_preview;
357 
358   // Used to save default settings
359   static bool _AlwaysCompileLoopMethods;
360   static bool _UseOnStackReplacement;
361   static bool _BackgroundCompilation;
362   static bool _ClipInlining;
363 
364   // GC ergonomics
365   static void set_conservative_max_heap_alignment();
366   static void set_use_compressed_oops();
367   static void set_use_compressed_klass_ptrs();
368   static jint set_ergonomics_flags();
369   static jint set_shared_spaces_flags_and_archive_paths();
370   // Limits the given heap size by the maximum amount of virtual
371   // memory this process is currently allowed to use. It also takes
372   // the virtual-to-physical ratio of the current GC into account.
373   static size_t limit_heap_by_allocatable_memory(size_t size);
374   // Setup heap size
375   static void set_heap_size();

376 
377   // Bytecode rewriting
378   static void set_bytecode_flags();
379 
380   // Invocation API hooks
381   static abort_hook_t     _abort_hook;
382   static exit_hook_t      _exit_hook;
383   static vfprintf_hook_t  _vfprintf_hook;
384 
385   // System properties
386   static bool add_property(const char* prop, PropertyWriteable writeable=WriteableProperty,
387                            PropertyInternal internal=ExternalProperty);
388 
389   // Used for module system related properties: converted from command-line flags.
390   // Basic properties are writeable as they operate as "last one wins" and will get overwritten.
391   // Numbered properties are never writeable, and always internal.
392   static bool create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal);
393   static bool create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count);
394 
395   static int process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase);
396 
397   // Aggressive optimization flags.
398   static jint set_aggressive_opts_flags();
399 
400   static jint set_aggressive_heap_flags();
401 
402   // Argument parsing
403   static bool parse_argument(const char* arg, JVMFlagOrigin origin);
404   static bool process_argument(const char* arg, jboolean ignore_unrecognized, JVMFlagOrigin origin);
405   static void process_java_launcher_argument(const char*, void*);
406   static void process_java_compiler_argument(const char* arg);
407   static jint parse_options_environment_variable(const char* name, ScopedVMInitArgs* vm_args);
408   static jint parse_java_tool_options_environment_variable(ScopedVMInitArgs* vm_args);
409   static jint parse_java_options_environment_variable(ScopedVMInitArgs* vm_args);
410   static jint parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args);
411   static jint parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args);
412   static jint parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize);
413   static jint insert_vm_options_file(const JavaVMInitArgs* args,
414                                      const char* vm_options_file,
415                                      const int vm_options_file_pos,
416                                      ScopedVMInitArgs* vm_options_file_args,
417                                      ScopedVMInitArgs* args_out);
418   static bool args_contains_vm_options_file_arg(const JavaVMInitArgs* args);
419   static jint expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
420                                           ScopedVMInitArgs* mod_args,
421                                           JavaVMInitArgs** args_out);
422   static jint match_special_option_and_act(const JavaVMInitArgs* args,
423                                            ScopedVMInitArgs* args_out);
424 
425   static bool handle_deprecated_print_gc_flags();
426 
427   static jint parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
428                                  const JavaVMInitArgs *java_tool_options_args,
429                                  const JavaVMInitArgs *java_options_args,
430                                  const JavaVMInitArgs *cmd_line_args);
431   static jint parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin);
432   static jint finalize_vm_init_args(bool patch_mod_javabase);
433   static bool is_bad_option(const JavaVMOption* option, jboolean ignore, const char* option_type);
434 
435   static bool is_bad_option(const JavaVMOption* option, jboolean ignore) {
436     return is_bad_option(option, ignore, NULL);
437   }
438 
439   static void describe_range_error(ArgsRange errcode);
440   static ArgsRange check_memory_size(julong size, julong min_size, julong max_size);
441   static ArgsRange parse_memory_size(const char* s, julong* long_arg,
442                                      julong min_size, julong max_size = max_uintx);
443 
444   // methods to build strings from individual args
445   static void build_jvm_args(const char* arg);
446   static void build_jvm_flags(const char* arg);
447   static void add_string(char*** bldarray, int* count, const char* arg);
448   static const char* build_resource_string(char** args, int count);
449 
450   // Returns true if the flag is obsolete (and not yet expired).
451   // In this case the 'version' buffer is filled in with
452   // the version number when the flag became obsolete.
453   static bool is_obsolete_flag(const char* flag_name, JDK_Version* version);
454 
455   // Returns 1 if the flag is deprecated (and not yet obsolete or expired).
456   //     In this case the 'version' buffer is filled in with the version number when
457   //     the flag became deprecated.
458   // Returns -1 if the flag is expired or obsolete.
459   // Returns 0 otherwise.
460   static int is_deprecated_flag(const char* flag_name, JDK_Version* version);
461 
462   // Return the real name for the flag passed on the command line (either an alias name or "flag_name").
463   static const char* real_flag_name(const char *flag_name);
464 
465   // Return the "real" name for option arg if arg is an alias, and print a warning if arg is deprecated.
466   // Return NULL if the arg has expired.
467   static const char* handle_aliases_and_deprecation(const char* arg, bool warn);
468 
469   static char*  SharedArchivePath;
470   static char*  SharedDynamicArchivePath;
471   static size_t _default_SharedBaseAddress; // The default value specified in globals.hpp
472   static int num_archives(const char* archive_path) NOT_CDS_RETURN_(0);
473   static void extract_shared_archive_paths(const char* archive_path,
474                                          char** base_archive_path,
475                                          char** top_archive_path) NOT_CDS_RETURN;
476 
477  public:
478   // Parses the arguments, first phase
479   static jint parse(const JavaVMInitArgs* args);
480   // Parse a string for a unsigned integer.  Returns true if value
481   // is an unsigned integer greater than or equal to the minimum
482   // parameter passed and returns the value in uintx_arg.  Returns
483   // false otherwise, with uintx_arg undefined.
484   static bool parse_uintx(const char* value, uintx* uintx_arg,
485                           uintx min_size);
486   // Apply ergonomics
487   static jint apply_ergo();
488   // Adjusts the arguments after the OS have adjusted the arguments
489   static jint adjust_after_os();
490 
491   // Check consistency or otherwise of VM argument settings
492   static bool check_vm_args_consistency();
493   // Used by os_solaris
494   static bool process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized);
495 
496   static size_t conservative_max_heap_alignment() { return _conservative_max_heap_alignment; }
497   // Return the maximum size a heap with compressed oops can take
498   static size_t max_heap_for_compressed_oops();
499 
500   // return a char* array containing all options
501   static char** jvm_flags_array()          { return _jvm_flags_array; }
502   static char** jvm_args_array()           { return _jvm_args_array; }
503   static int num_jvm_flags()               { return _num_jvm_flags; }
504   static int num_jvm_args()                { return _num_jvm_args; }
505   // return the arguments passed to the Java application
506   static const char* java_command()        { return _java_command; }
507 
508   // print jvm_flags, jvm_args and java_command
509   static void print_on(outputStream* st);
510   static void print_summary_on(outputStream* st);
511 
512   // convenient methods to get and set jvm_flags_file
513   static const char* get_jvm_flags_file()  { return _jvm_flags_file; }
514   static void set_jvm_flags_file(const char *value) {
515     if (_jvm_flags_file != NULL) {
516       os::free(_jvm_flags_file);
517     }
518     _jvm_flags_file = os::strdup_check_oom(value);
519   }
520   // convenient methods to obtain / print jvm_flags and jvm_args
521   static const char* jvm_flags()           { return build_resource_string(_jvm_flags_array, _num_jvm_flags); }
522   static const char* jvm_args()            { return build_resource_string(_jvm_args_array, _num_jvm_args); }
523   static void print_jvm_flags_on(outputStream* st);
524   static void print_jvm_args_on(outputStream* st);
525 
526   // -Dkey=value flags
527   static SystemProperty*  system_properties()   { return _system_properties; }
528   static const char*    get_property(const char* key);
529 
530   // -Djava.vendor.url.bug
531   static const char* java_vendor_url_bug()  { return _java_vendor_url_bug; }
532 
533   // -Dsun.java.launcher
534   static const char* sun_java_launcher()    { return _sun_java_launcher; }
535   // Was VM created by a Java launcher?
536   static bool created_by_java_launcher();
537   // -Dsun.java.launcher.is_altjvm
538   static bool sun_java_launcher_is_altjvm();
539 
540   // -Xrun
541   static AgentLibrary* libraries()          { return _libraryList.first(); }
542   static bool init_libraries_at_startup()   { return !_libraryList.is_empty(); }
543   static void convert_library_to_agent(AgentLibrary* lib)
544                                             { _libraryList.remove(lib);
545                                               _agentList.add(lib); }
546 
547   // -agentlib -agentpath
548   static AgentLibrary* agents()             { return _agentList.first(); }
549   static bool init_agents_at_startup()      { return !_agentList.is_empty(); }
550 
551   // abort, exit, vfprintf hooks
552   static abort_hook_t    abort_hook()       { return _abort_hook; }
553   static exit_hook_t     exit_hook()        { return _exit_hook; }
554   static vfprintf_hook_t vfprintf_hook()    { return _vfprintf_hook; }
555 
556   static const char* GetSharedArchivePath() { return SharedArchivePath; }
557   static const char* GetSharedDynamicArchivePath() { return SharedDynamicArchivePath; }
558   static size_t default_SharedBaseAddress() { return _default_SharedBaseAddress; }
559   // Java launcher properties
560   static void process_sun_java_launcher_properties(JavaVMInitArgs* args);
561 
562   // System properties
563   static void init_system_properties();
564 
565   // Update/Initialize System properties after JDK version number is known
566   static void init_version_specific_system_properties();
567 
568   // Update VM info property - called after argument parsing
569   static void update_vm_info_property(const char* vm_info) {
570     _vm_info->set_value(vm_info);
571   }
572 
573   // Property List manipulation
574   static void PropertyList_add(SystemProperty *element);
575   static void PropertyList_add(SystemProperty** plist, SystemProperty *element);
576   static void PropertyList_add(SystemProperty** plist, const char* k, const char* v, bool writeable, bool internal);
577 
578   static void PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
579                                       PropertyAppendable append, PropertyWriteable writeable,
580                                       PropertyInternal internal);
581   static const char* PropertyList_get_value(SystemProperty* plist, const char* key);
582   static const char* PropertyList_get_readable_value(SystemProperty* plist, const char* key);
583   static int  PropertyList_count(SystemProperty* pl);
584   static int  PropertyList_readable_count(SystemProperty* pl);
585   static const char* PropertyList_get_key_at(SystemProperty* pl,int index);
586   static char* PropertyList_get_value_at(SystemProperty* pl,int index);
587 
588   static bool is_internal_module_property(const char* option);
589 
590   // Miscellaneous System property value getter and setters.
591   static void set_dll_dir(const char *value) { _sun_boot_library_path->set_value(value); }
592   static void set_java_home(const char *value) { _java_home->set_value(value); }
593   static void set_library_path(const char *value) { _java_library_path->set_value(value); }
594   static void set_ext_dirs(char *value)     { _ext_dirs = os::strdup_check_oom(value); }
595 
596   // Set up the underlying pieces of the system boot class path
597   static void add_patch_mod_prefix(const char *module_name, const char *path, bool* patch_mod_javabase);
598   static void set_sysclasspath(const char *value, bool has_jimage) {
599     // During start up, set by os::set_boot_path()
600     assert(get_sysclasspath() == NULL, "System boot class path previously set");
601     _system_boot_class_path->set_value(value);
602     _has_jimage = has_jimage;
603   }
604   static void append_sysclasspath(const char *value) {
605     _system_boot_class_path->append_value(value);
606     _jdk_boot_class_path_append->append_value(value);
607   }
608 
609   static GrowableArray<ModulePatchPath*>* get_patch_mod_prefix() { return _patch_mod_prefix; }
610   static char* get_sysclasspath() { return _system_boot_class_path->value(); }
611   static char* get_jdk_boot_class_path_append() { return _jdk_boot_class_path_append->value(); }
612   static bool has_jimage() { return _has_jimage; }
613 
614   static char* get_java_home()    { return _java_home->value(); }
615   static char* get_dll_dir()      { return _sun_boot_library_path->value(); }
616   static char* get_ext_dirs()     { return _ext_dirs;  }
617   static char* get_appclasspath() { return _java_class_path->value(); }
618   static void  fix_appclasspath();
619 
620   static char* get_default_shared_archive_path() NOT_CDS_RETURN_(NULL);
621   static void  init_shared_archive_paths() NOT_CDS_RETURN;
622 
623   // Operation modi
624   static Mode mode()                { return _mode;           }
625   static bool is_interpreter_only() { return mode() == _int;  }
626   static bool is_compiler_only()    { return mode() == _comp; }
627 
628 
629   // preview features
630   static void set_enable_preview() { _enable_preview = true; }
631   static bool enable_preview() { return _enable_preview; }
632 
633   // Utility: copies src into buf, replacing "%%" with "%" and "%p" with pid.
634   static bool copy_expand_pid(const char* src, size_t srclen, char* buf, size_t buflen);
635 
636   static void check_unsupported_dumping_properties() NOT_CDS_RETURN;
637 
638   static bool check_unsupported_cds_runtime_properties() NOT_CDS_RETURN0;
639 
640   static bool atojulong(const char *s, julong* result);
641 
642   static bool has_jfr_option() NOT_JFR_RETURN_(false);
643 
644   static bool is_dumping_archive() { return DumpSharedSpaces || DynamicDumpSharedSpaces; }
645 
646   static void assert_is_dumping_archive() {
647     assert(Arguments::is_dumping_archive(), "dump time only");
648   }
649 
650   DEBUG_ONLY(static bool verify_special_jvm_flags(bool check_globals);)
651 };
652 
653 // Disable options not supported in this release, with a warning if they
654 // were explicitly requested on the command-line
655 #define UNSUPPORTED_OPTION(opt)                          \
656 do {                                                     \
657   if (opt) {                                             \
658     if (FLAG_IS_CMDLINE(opt)) {                          \
659       warning("-XX:+" #opt " not supported in this VM"); \
660     }                                                    \
661     FLAG_SET_DEFAULT(opt, false);                        \
662   }                                                      \
663 } while(0)
664 
665 // similar to UNSUPPORTED_OPTION but sets flag to NULL
666 #define UNSUPPORTED_OPTION_NULL(opt)                     \
667 do {                                                     \
668   if (opt) {                                             \
669     if (FLAG_IS_CMDLINE(opt)) {                          \
670       warning("-XX flag " #opt " not supported in this VM"); \
671     }                                                    \
672     FLAG_SET_DEFAULT(opt, NULL);                         \
673   }                                                      \
674 } while(0)
675 
676 // Initialize options not supported in this release, with a warning
677 // if they were explicitly requested on the command-line
678 #define UNSUPPORTED_OPTION_INIT(opt, value)              \
679 do {                                                     \
680   if (FLAG_IS_CMDLINE(opt)) {                            \
681     warning("-XX flag " #opt " not supported in this VM"); \
682   }                                                      \
683   FLAG_SET_DEFAULT(opt, value);                          \
684 } while(0)
685 
686 #endif // SHARE_RUNTIME_ARGUMENTS_HPP
--- EOF ---