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