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