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