1 /*
2 * Copyright (c) 1997, 2026, 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 #include "cds/aotLogging.hpp"
26 #include "cds/cds_globals.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/javaAssertions.hpp"
30 #include "classfile/moduleEntry.hpp"
31 #include "classfile/stringTable.hpp"
32 #include "classfile/symbolTable.hpp"
33 #include "compiler/compilerDefinitions.hpp"
34 #include "cppstdlib/limits.hpp"
35 #include "gc/shared/gc_globals.hpp"
36 #include "gc/shared/gcArguments.hpp"
37 #include "gc/shared/gcConfig.hpp"
38 #include "gc/shared/stringdedup/stringDedup.hpp"
39 #include "gc/shared/tlab_globals.hpp"
40 #include "jvm.h"
41 #include "logging/log.hpp"
42 #include "logging/logConfiguration.hpp"
43 #include "logging/logStream.hpp"
44 #include "logging/logTag.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "nmt/nmtCommon.hpp"
47 #include "oops/compressedKlass.hpp"
48 #include "oops/instanceKlass.hpp"
49 #include "oops/objLayout.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "prims/jvmtiAgentList.hpp"
52 #include "prims/jvmtiExport.hpp"
53 #include "runtime/arguments.hpp"
54 #include "runtime/flags/jvmFlag.hpp"
55 #include "runtime/flags/jvmFlagAccess.hpp"
56 #include "runtime/flags/jvmFlagLimit.hpp"
57 #include "runtime/globals_extension.hpp"
58 #include "runtime/java.hpp"
59 #include "runtime/os.hpp"
60 #include "runtime/safepoint.hpp"
61 #include "runtime/safepointMechanism.hpp"
62 #include "runtime/synchronizer.hpp"
63 #include "runtime/vm_version.hpp"
64 #include "services/management.hpp"
65 #include "utilities/align.hpp"
66 #include "utilities/debug.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/macros.hpp"
69 #include "utilities/parseInteger.hpp"
70 #include "utilities/powerOfTwo.hpp"
71 #include "utilities/stringUtils.hpp"
72 #include "utilities/systemMemoryBarrier.hpp"
73 #if INCLUDE_JFR
74 #include "jfr/jfr.hpp"
75 #endif
76
77 static const char _default_java_launcher[] = "generic";
78
79 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
80
81 char* Arguments::_jvm_flags_file = nullptr;
82 char** Arguments::_jvm_flags_array = nullptr;
83 int Arguments::_num_jvm_flags = 0;
84 char** Arguments::_jvm_args_array = nullptr;
85 int Arguments::_num_jvm_args = 0;
86 unsigned int Arguments::_addmods_count = 0;
87 #if INCLUDE_JVMCI
88 bool Arguments::_jvmci_module_added = false;
89 #endif
90 char* Arguments::_java_command = nullptr;
91 SystemProperty* Arguments::_system_properties = nullptr;
92 size_t Arguments::_conservative_max_heap_alignment = 0;
93 Arguments::Mode Arguments::_mode = _mixed;
94 const char* Arguments::_java_vendor_url_bug = nullptr;
95 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
96 bool Arguments::_executing_unit_tests = false;
97
98 // These parameters are reset in method parse_vm_init_args()
99 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
100 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
101 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
102 bool Arguments::_ClipInlining = ClipInlining;
103 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
104
105 bool Arguments::_enable_preview = false;
106 bool Arguments::_has_jdwp_agent = false;
107
108 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
109
110 // These are not set by the JDK's built-in launchers, but they can be set by
111 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
112 // JavaVMOption in jni.h.
113 abort_hook_t Arguments::_abort_hook = nullptr;
114 exit_hook_t Arguments::_exit_hook = nullptr;
115 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
116
117
118 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
119 SystemProperty *Arguments::_java_library_path = nullptr;
120 SystemProperty *Arguments::_java_home = nullptr;
121 SystemProperty *Arguments::_java_class_path = nullptr;
122 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
123 SystemProperty *Arguments::_vm_info = nullptr;
124
125 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
126 PathString *Arguments::_boot_class_path = nullptr;
127 bool Arguments::_has_jimage = false;
128
129 char* Arguments::_ext_dirs = nullptr;
130
131 // True if -Xshare:auto option was specified.
132 static bool xshare_auto_cmd_line = false;
133
134 // True if -Xint/-Xmixed/-Xcomp were specified
135 static bool mode_flag_cmd_line = false;
136
137 struct VMInitArgsGroup {
138 const JavaVMInitArgs* _args;
139 JVMFlagOrigin _origin;
140 };
141
142 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
143 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
144 if (new_value == nullptr) {
145 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
146 return false;
147 }
148 if (_value != nullptr) {
149 FreeHeap(_value);
150 }
151 _value = new_value;
152 strcpy(_value, value);
153 return true;
154 }
155
156 void PathString::append_value(const char *value) {
157 char *sp;
158 size_t len = 0;
159 if (value != nullptr) {
160 len = strlen(value);
161 if (_value != nullptr) {
162 len += strlen(_value);
163 }
164 sp = AllocateHeap(len+2, mtArguments);
165 assert(sp != nullptr, "Unable to allocate space for new append path value");
166 if (sp != nullptr) {
167 if (_value != nullptr) {
168 strcpy(sp, _value);
169 strcat(sp, os::path_separator());
170 strcat(sp, value);
171 FreeHeap(_value);
172 } else {
173 strcpy(sp, value);
174 }
175 _value = sp;
176 }
177 }
178 }
179
180 PathString::PathString(const char* value) {
181 if (value == nullptr) {
182 _value = nullptr;
183 } else {
184 _value = AllocateHeap(strlen(value)+1, mtArguments);
185 strcpy(_value, value);
186 }
187 }
188
189 PathString::~PathString() {
190 if (_value != nullptr) {
191 FreeHeap(_value);
192 _value = nullptr;
193 }
194 }
195
196 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
197 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
198 size_t len = strlen(module_name) + 1;
199 _module_name = AllocateHeap(len, mtInternal);
200 strncpy(_module_name, module_name, len); // copy the trailing null
201 _path = new PathString(path);
202 }
203
204 ModulePatchPath::~ModulePatchPath() {
205 if (_module_name != nullptr) {
206 FreeHeap(_module_name);
207 _module_name = nullptr;
208 }
209 if (_path != nullptr) {
210 delete _path;
211 _path = nullptr;
212 }
213 }
214
215 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
216 if (key == nullptr) {
217 _key = nullptr;
218 } else {
219 _key = AllocateHeap(strlen(key)+1, mtArguments);
220 strcpy(_key, key);
221 }
222 _next = nullptr;
223 _internal = internal;
224 _writeable = writeable;
225 }
226
227 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
228 // part of the option string.
229 static bool match_option(const JavaVMOption *option, const char* name,
230 const char** tail) {
231 size_t len = strlen(name);
232 if (strncmp(option->optionString, name, len) == 0) {
233 *tail = option->optionString + len;
234 return true;
235 } else {
236 return false;
237 }
238 }
239
240 // Check if 'option' matches 'name'. No "tail" is allowed.
241 static bool match_option(const JavaVMOption *option, const char* name) {
242 const char* tail = nullptr;
243 bool result = match_option(option, name, &tail);
244 if (tail != nullptr && *tail == '\0') {
245 return result;
246 } else {
247 return false;
248 }
249 }
250
251 // Return true if any of the strings in null-terminated array 'names' matches.
252 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
253 // the option must match exactly.
254 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
255 bool tail_allowed) {
256 for (/* empty */; *names != nullptr; ++names) {
257 if (match_option(option, *names, tail)) {
258 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
259 return true;
260 }
261 }
262 }
263 return false;
264 }
265
266 #if INCLUDE_JFR
267 static bool _has_jfr_option = false; // is using JFR
268
269 // return true on failure
270 static bool match_jfr_option(const JavaVMOption** option) {
271 assert((*option)->optionString != nullptr, "invariant");
272 char* tail = nullptr;
273 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
274 _has_jfr_option = true;
275 return Jfr::on_start_flight_recording_option(option, tail);
276 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
277 _has_jfr_option = true;
278 return Jfr::on_flight_recorder_option(option, tail);
279 }
280 return false;
281 }
282
283 bool Arguments::has_jfr_option() {
284 return _has_jfr_option;
285 }
286 #endif
287
288 static void logOption(const char* opt) {
289 if (PrintVMOptions) {
290 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
291 }
292 }
293
294 bool needs_module_property_warning = false;
295
296 #define MODULE_PROPERTY_PREFIX "jdk.module."
297 #define MODULE_PROPERTY_PREFIX_LEN 11
298 #define ADDEXPORTS "addexports"
299 #define ADDEXPORTS_LEN 10
300 #define ADDREADS "addreads"
301 #define ADDREADS_LEN 8
302 #define ADDOPENS "addopens"
303 #define ADDOPENS_LEN 8
304 #define PATCH "patch"
305 #define PATCH_LEN 5
306 #define ADDMODS "addmods"
307 #define ADDMODS_LEN 7
308 #define LIMITMODS "limitmods"
309 #define LIMITMODS_LEN 9
310 #define PATH "path"
311 #define PATH_LEN 4
312 #define UPGRADE_PATH "upgrade.path"
313 #define UPGRADE_PATH_LEN 12
314 #define ENABLE_NATIVE_ACCESS "enable.native.access"
315 #define ENABLE_NATIVE_ACCESS_LEN 20
316 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
317 #define ILLEGAL_NATIVE_ACCESS_LEN 21
318 #define ENABLE_FINAL_FIELD_MUTATION "enable.final.field.mutation"
319 #define ENABLE_FINAL_FIELD_MUTATION_LEN 27
320 #define ILLEGAL_FINAL_FIELD_MUTATION "illegal.final.field.mutation"
321 #define ILLEGAL_FINAL_FIELD_MUTATION_LEN 28
322
323 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
324 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
325 return ((strncmp(option, property, len) == 0) &&
326 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
327 }
328
329 // Return true if property starts with "jdk.module." and its ensuing chars match
330 // any of the reserved module properties.
331 // property should be passed without the leading "-D".
332 bool Arguments::is_internal_module_property(const char* property) {
333 return internal_module_property_helper(property, false);
334 }
335
336 // Returns true if property is one of those recognized by is_internal_module_property() but
337 // is not supported by CDS archived full module graph.
338 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
339 return internal_module_property_helper(property, true);
340 }
341
342 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
343 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
344 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
345 if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
346 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
347 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
348 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN) ||
349 matches_property_suffix(property_suffix, ENABLE_FINAL_FIELD_MUTATION, ENABLE_FINAL_FIELD_MUTATION_LEN) ||
350 matches_property_suffix(property_suffix, ILLEGAL_FINAL_FIELD_MUTATION, ILLEGAL_FINAL_FIELD_MUTATION_LEN)) {
351 return true;
352 }
353
354 if (!check_for_cds) {
355 // CDS notes: these properties are supported by CDS archived full module graph.
356 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
357 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
358 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
359 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
360 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
361 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
362 return true;
363 }
364 }
365 }
366 return false;
367 }
368
369 // Process java launcher properties.
370 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
371 // See if sun.java.launcher is defined.
372 // Must do this before setting up other system properties,
373 // as some of them may depend on launcher type.
374 for (int index = 0; index < args->nOptions; index++) {
375 const JavaVMOption* option = args->options + index;
376 const char* tail;
377
378 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
379 process_java_launcher_argument(tail, option->extraInfo);
380 continue;
381 }
382 if (match_option(option, "-XX:+ExecutingUnitTests")) {
383 _executing_unit_tests = true;
384 continue;
385 }
386 }
387 }
388
389 // Initialize system properties key and value.
390 void Arguments::init_system_properties() {
391
392 // Set up _boot_class_path which is not a property but
393 // relies heavily on argument processing and the jdk.boot.class.path.append
394 // property. It is used to store the underlying boot class path.
395 _boot_class_path = new PathString(nullptr);
396
397 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
398 "Java Virtual Machine Specification", false));
399 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
400 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
401 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
402
403 // Initialize the vm.info now, but it will need updating after argument parsing.
404 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
405
406 // Following are JVMTI agent writable properties.
407 // Properties values are set to nullptr and they are
408 // os specific they are initialized in os::init_system_properties_values().
409 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
410 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
411 _java_home = new SystemProperty("java.home", nullptr, true);
412 _java_class_path = new SystemProperty("java.class.path", "", true);
413 // jdk.boot.class.path.append is a non-writeable, internal property.
414 // It can only be set by either:
415 // - -Xbootclasspath/a:
416 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
417 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
418
419 // Add to System Property list.
420 PropertyList_add(&_system_properties, _sun_boot_library_path);
421 PropertyList_add(&_system_properties, _java_library_path);
422 PropertyList_add(&_system_properties, _java_home);
423 PropertyList_add(&_system_properties, _java_class_path);
424 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
425 PropertyList_add(&_system_properties, _vm_info);
426
427 // Set OS specific system properties values
428 os::init_system_properties_values();
429 }
430
431 // Update/Initialize System properties after JDK version number is known
432 void Arguments::init_version_specific_system_properties() {
433 enum { bufsz = 16 };
434 char buffer[bufsz];
435 const char* spec_vendor = "Oracle Corporation";
436 uint32_t spec_version = JDK_Version::current().major_version();
437
438 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
439
440 PropertyList_add(&_system_properties,
441 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
442 PropertyList_add(&_system_properties,
443 new SystemProperty("java.vm.specification.version", buffer, false));
444 PropertyList_add(&_system_properties,
445 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
446 }
447
448 /*
449 * -XX argument processing:
450 *
451 * -XX arguments are defined in several places, such as:
452 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
453 * -XX arguments are parsed in parse_argument().
454 * -XX argument bounds checking is done in check_vm_args_consistency().
455 *
456 * Over time -XX arguments may change. There are mechanisms to handle common cases:
457 *
458 * ALIASED: An option that is simply another name for another option. This is often
459 * part of the process of deprecating a flag, but not all aliases need
460 * to be deprecated.
461 *
462 * Create an alias for an option by adding the old and new option names to the
463 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
464 *
465 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
466 * support may be removed in the future. Both regular and aliased options may be
467 * deprecated.
468 *
469 * Add a deprecation warning for an option (or alias) by adding an entry in the
470 * "special_jvm_flags" table and setting the "deprecated_in" field.
471 * Often an option "deprecated" in one major release will
472 * be made "obsolete" in the next. In this case the entry should also have its
473 * "obsolete_in" field set.
474 *
475 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
476 * on the command line. A warning is printed to let the user know that option might not
477 * be accepted in the future.
478 *
479 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
480 * table and setting the "obsolete_in" field.
481 *
482 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
483 * to the current JDK version. The system will flatly refuse to admit the existence of
484 * the flag. This allows a flag to die automatically over JDK releases.
485 *
486 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
487 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
488 * - Newly obsolete or expired deprecated options should have their global variable
489 * definitions removed (from globals.hpp, etc) and related implementations removed.
490 *
491 * Recommended approach for removing options:
492 *
493 * To remove options commonly used by customers (e.g. product -XX options), use
494 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
495 *
496 * To remove internal options (e.g. diagnostic, experimental, develop options), use
497 * a 2-step model adding major release numbers to the obsolete and expire columns.
498 *
499 * To change the name of an option, use the alias table as well as a 2-step
500 * model adding major release numbers to the deprecate and expire columns.
501 * Think twice about aliasing commonly used customer options.
502 *
503 * There are times when it is appropriate to leave a future release number as undefined.
504 *
505 * Tests: Aliases should be tested in VMAliasOptions.java.
506 * Deprecated options should be tested in VMDeprecatedOptions.java.
507 */
508
509 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
510 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
511 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
512 // the command-line as usual, but will issue a warning.
513 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
514 // the command-line, while issuing a warning and ignoring the flag value.
515 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
516 // existence of the flag.
517 //
518 // MANUAL CLEANUP ON JDK VERSION UPDATES:
519 // This table ensures that the handling of options will update automatically when the JDK
520 // version is incremented, but the source code needs to be cleanup up manually:
521 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
522 // variable should be removed, as well as users of the variable.
523 // - As "deprecated" options age into "obsolete" options, move the entry into the
524 // "Obsolete Flags" section of the table.
525 // - All expired options should be removed from the table.
526 static SpecialFlag const special_jvm_flags[] = {
527 // -------------- Deprecated Flags --------------
528 // --- Non-alias flags - sorted by obsolete_in then expired_in:
529 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
530 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
531 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
532 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
533 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
534 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
535 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
536 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
537
538 // -------------- Obsolete Flags - sorted by expired_in --------------
539
540 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
541 #if defined(AARCH64)
542 { "NearCpool", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
543 #endif
544 #ifdef _LP64
545 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(27), JDK_Version::undefined() },
546 #endif
547
548 { "PSChunkLargeArrays", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
549 { "ParallelRefProcEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
550 { "ParallelRefProcBalancingEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
551 { "MaxRAM", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
552 { "NewSizeThreadIncrease", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
553 { "NeverActAsServerClassMachine", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
554 { "AlwaysActAsServerClassMachine", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
555 { "UseXMMForArrayCopy", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
556 { "UseNewLongLShift", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
557 { "AggressiveHeap", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
558
559 #ifdef ASSERT
560 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
561 #endif
562
563 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
564 // These entries will generate build errors. Their purpose is to test the macros.
565 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
566 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
567 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
568 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
569 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
570 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
571 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
572 #endif
573
574 { nullptr, JDK_Version(0), JDK_Version(0) }
575 };
576
577 // Flags that are aliases for other flags.
578 typedef struct {
579 const char* alias_name;
580 const char* real_name;
581 } AliasedFlag;
582
583 static AliasedFlag const aliased_jvm_flags[] = {
584 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
585 { nullptr, nullptr}
586 };
587
588 // Return true if "v" is less than "other", where "other" may be "undefined".
589 static bool version_less_than(JDK_Version v, JDK_Version other) {
590 assert(!v.is_undefined(), "must be defined");
591 if (!other.is_undefined() && v.compare(other) >= 0) {
592 return false;
593 } else {
594 return true;
595 }
596 }
597
598 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
599 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
600 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
601 flag = special_jvm_flags[i];
602 return true;
603 }
604 }
605 return false;
606 }
607
608 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
609 assert(version != nullptr, "Must provide a version buffer");
610 SpecialFlag flag;
611 if (lookup_special_flag(flag_name, flag)) {
612 if (!flag.obsolete_in.is_undefined()) {
613 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
614 *version = flag.obsolete_in;
615 // This flag may have been marked for obsoletion in this version, but we may not
616 // have actually removed it yet. Rather than ignoring it as soon as we reach
617 // this version we allow some time for the removal to happen. So if the flag
618 // still actually exists we process it as normal, but issue an adjusted warning.
619 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
620 if (real_flag != nullptr) {
621 char version_str[256];
622 version->to_string(version_str, sizeof(version_str));
623 warning("Temporarily processing option %s; support is scheduled for removal in %s",
624 flag_name, version_str);
625 return false;
626 }
627 return true;
628 }
629 }
630 }
631 return false;
632 }
633
634 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
635 assert(version != nullptr, "Must provide a version buffer");
636 SpecialFlag flag;
637 if (lookup_special_flag(flag_name, flag)) {
638 if (!flag.deprecated_in.is_undefined()) {
639 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
640 version_less_than(JDK_Version::current(), flag.expired_in)) {
641 *version = flag.deprecated_in;
642 return 1;
643 } else {
644 return -1;
645 }
646 }
647 }
648 return 0;
649 }
650
651 const char* Arguments::real_flag_name(const char *flag_name) {
652 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
653 const AliasedFlag& flag_status = aliased_jvm_flags[i];
654 if (strcmp(flag_status.alias_name, flag_name) == 0) {
655 return flag_status.real_name;
656 }
657 }
658 return flag_name;
659 }
660
661 #ifdef ASSERT
662 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
663 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
664 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
665 return true;
666 }
667 }
668 return false;
669 }
670
671 // Verifies the correctness of the entries in the special_jvm_flags table.
672 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
673 // version being earlier than the deprecation version, then a warning is issued
674 // and verification fails - by returning false. If it is detected that the table
675 // is out of date, with respect to the current version, then ideally a warning is
676 // issued but verification does not fail. This allows the VM to operate when the
677 // version is first updated, without needing to update all the impacted flags at
678 // the same time. In practice we can't issue the warning immediately when the version
679 // is updated as it occurs for every test and some tests are not prepared to handle
680 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
681 // if the check_globals flag is true, and in addition allow a grace period and only
682 // check for stale flags when we hit build 25 (which is far enough into the 6 month
683 // release cycle that all flag updates should have been processed, whilst still
684 // leaving time to make the change before RDP2).
685 // We use a gtest to call this, passing true, so that we can detect stale flags before
686 // the end of the release cycle.
687
688 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
689
690 bool Arguments::verify_special_jvm_flags(bool check_globals) {
691 bool success = true;
692 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
693 const SpecialFlag& flag = special_jvm_flags[i];
694 if (lookup_special_flag(flag.name, i)) {
695 warning("Duplicate special flag declaration \"%s\"", flag.name);
696 success = false;
697 }
698 if (flag.deprecated_in.is_undefined() &&
699 flag.obsolete_in.is_undefined()) {
700 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
701 success = false;
702 }
703
704 if (!flag.deprecated_in.is_undefined()) {
705 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
706 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
707 success = false;
708 }
709
710 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
711 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
712 success = false;
713 }
714 }
715
716 if (!flag.obsolete_in.is_undefined()) {
717 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
718 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
719 success = false;
720 }
721
722 // if flag has become obsolete it should not have a "globals" flag defined anymore.
723 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
724 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
725 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
726 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
727 success = false;
728 }
729 }
730
731 } else if (!flag.expired_in.is_undefined()) {
732 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
733 success = false;
734 }
735
736 if (!flag.expired_in.is_undefined()) {
737 // if flag has become expired it should not have a "globals" flag defined anymore.
738 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
739 !version_less_than(JDK_Version::current(), flag.expired_in)) {
740 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
741 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
742 success = false;
743 }
744 }
745 }
746 }
747 return success;
748 }
749 #endif
750
751 bool Arguments::atojulong(const char *s, julong* result) {
752 return parse_integer(s, result);
753 }
754
755 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
756 if (size < min_size) return arg_too_small;
757 if (size > max_size) return arg_too_big;
758 return arg_in_range;
759 }
760
761 // Describe an argument out of range error
762 void Arguments::describe_range_error(ArgsRange errcode) {
763 switch(errcode) {
764 case arg_too_big:
765 jio_fprintf(defaultStream::error_stream(),
766 "The specified size exceeds the maximum "
767 "representable size.\n");
768 break;
769 case arg_too_small:
770 case arg_unreadable:
771 case arg_in_range:
772 // do nothing for now
773 break;
774 default:
775 ShouldNotReachHere();
776 }
777 }
778
779 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
780 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
781 return true;
782 } else {
783 return false;
784 }
785 }
786
787 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
788 // strtod allows leading whitespace, but our flag format does not.
789 if (*value == '\0' || isspace((unsigned char) *value)) {
790 return false;
791 }
792 char* end;
793 errno = 0;
794 double v = strtod(value, &end);
795 if ((errno != 0) || (*end != 0)) {
796 return false;
797 }
798 if (g_isnan(v) || !g_isfinite(v)) {
799 // Currently we cannot handle these special values.
800 return false;
801 }
802
803 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
804 return true;
805 }
806 return false;
807 }
808
809 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
810 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
811
812 if (flag->is_int()) {
813 int v;
814 if (parse_integer(value, &v)) {
815 result = JVMFlagAccess::set_int(flag, &v, origin);
816 }
817 } else if (flag->is_uint()) {
818 uint v;
819 if (parse_integer(value, &v)) {
820 result = JVMFlagAccess::set_uint(flag, &v, origin);
821 }
822 } else if (flag->is_intx()) {
823 intx v;
824 if (parse_integer(value, &v)) {
825 result = JVMFlagAccess::set_intx(flag, &v, origin);
826 }
827 } else if (flag->is_uintx()) {
828 uintx v;
829 if (parse_integer(value, &v)) {
830 result = JVMFlagAccess::set_uintx(flag, &v, origin);
831 }
832 } else if (flag->is_uint64_t()) {
833 uint64_t v;
834 if (parse_integer(value, &v)) {
835 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
836 }
837 } else if (flag->is_size_t()) {
838 size_t v;
839 if (parse_integer(value, &v)) {
840 result = JVMFlagAccess::set_size_t(flag, &v, origin);
841 }
842 }
843
844 return result == JVMFlag::SUCCESS;
845 }
846
847 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
848 if (value[0] == '\0') {
849 value = nullptr;
850 }
851 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
852 // Contract: JVMFlag always returns a pointer that needs freeing.
853 FREE_C_HEAP_ARRAY(value);
854 return true;
855 }
856
857 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
858 const char* old_value = "";
859 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
860 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
861 size_t new_len = strlen(new_value);
862 const char* value;
863 char* free_this_too = nullptr;
864 if (old_len == 0) {
865 value = new_value;
866 } else if (new_len == 0) {
867 value = old_value;
868 } else {
869 size_t length = old_len + 1 + new_len + 1;
870 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
871 // each new setting adds another LINE to the switch:
872 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
873 value = buf;
874 free_this_too = buf;
875 }
876 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
877 // JVMFlag always returns a pointer that needs freeing.
878 FREE_C_HEAP_ARRAY(value);
879 // JVMFlag made its own copy, so I must delete my own temp. buffer.
880 FREE_C_HEAP_ARRAY(free_this_too);
881 return true;
882 }
883
884 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
885 const char* real_name = real_flag_name(arg);
886 JDK_Version since = JDK_Version();
887 switch (is_deprecated_flag(arg, &since)) {
888 case -1: {
889 // Obsolete or expired, so don't process normally,
890 // but allow for an obsolete flag we're still
891 // temporarily allowing.
892 if (!is_obsolete_flag(arg, &since)) {
893 return real_name;
894 }
895 // Note if we're not considered obsolete then we can't be expired either
896 // as obsoletion must come first.
897 return nullptr;
898 }
899 case 0:
900 return real_name;
901 case 1: {
902 char version[256];
903 since.to_string(version, sizeof(version));
904 if (real_name != arg) {
905 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
906 arg, version, real_name);
907 } else {
908 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
909 arg, version);
910 }
911 return real_name;
912 }
913 }
914 ShouldNotReachHere();
915 return nullptr;
916 }
917
918 #define BUFLEN 255
919
920 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
921 char name_copied[BUFLEN+1];
922 if (name[name_length] != 0) {
923 if (name_length > BUFLEN) {
924 return nullptr;
925 } else {
926 strncpy(name_copied, name, name_length);
927 name_copied[name_length] = '\0';
928 name = name_copied;
929 }
930 }
931
932 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
933 if (real_name == nullptr) {
934 return nullptr;
935 }
936 JVMFlag* flag = JVMFlag::find_flag(real_name);
937 return flag;
938 }
939
940 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
941 bool is_bool = false;
942 bool bool_val = false;
943 char c = *arg;
944 if (c == '+' || c == '-') {
945 is_bool = true;
946 bool_val = (c == '+');
947 arg++;
948 }
949
950 const char* name = arg;
951 while (true) {
952 c = *arg;
953 if (isalnum(c) || (c == '_')) {
954 ++arg;
955 } else {
956 break;
957 }
958 }
959
960 size_t name_len = size_t(arg - name);
961 if (name_len == 0) {
962 return false;
963 }
964
965 JVMFlag* flag = find_jvm_flag(name, name_len);
966 if (flag == nullptr) {
967 return false;
968 }
969
970 if (is_bool) {
971 if (*arg != 0) {
972 // Error -- extra characters such as -XX:+BoolFlag=123
973 return false;
974 }
975 return set_bool_flag(flag, bool_val, origin);
976 }
977
978 if (arg[0] == '=') {
979 const char* value = arg + 1;
980 if (flag->is_ccstr()) {
981 if (flag->ccstr_accumulates()) {
982 return append_to_string_flag(flag, value, origin);
983 } else {
984 return set_string_flag(flag, value, origin);
985 }
986 } else if (flag->is_double()) {
987 return set_fp_numeric_flag(flag, value, origin);
988 } else {
989 return set_numeric_flag(flag, value, origin);
990 }
991 }
992
993 if (arg[0] == ':' && arg[1] == '=') {
994 // -XX:Foo:=xxx will reset the string flag to the given value.
995 const char* value = arg + 2;
996 return set_string_flag(flag, value, origin);
997 }
998
999 return false;
1000 }
1001
1002 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1003 assert(bldarray != nullptr, "illegal argument");
1004
1005 if (arg == nullptr) {
1006 return;
1007 }
1008
1009 int new_count = *count + 1;
1010
1011 // expand the array and add arg to the last element
1012 if (*bldarray == nullptr) {
1013 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1014 } else {
1015 *bldarray = REALLOC_C_HEAP_ARRAY(*bldarray, new_count, mtArguments);
1016 }
1017 (*bldarray)[*count] = os::strdup_check_oom(arg);
1018 *count = new_count;
1019 }
1020
1021 void Arguments::build_jvm_args(const char* arg) {
1022 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1023 }
1024
1025 void Arguments::build_jvm_flags(const char* arg) {
1026 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1027 }
1028
1029 // utility function to return a string that concatenates all
1030 // strings in a given char** array
1031 const char* Arguments::build_resource_string(char** args, int count) {
1032 if (args == nullptr || count == 0) {
1033 return nullptr;
1034 }
1035 size_t length = 0;
1036 for (int i = 0; i < count; i++) {
1037 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1038 }
1039 char* s = NEW_RESOURCE_ARRAY(char, length);
1040 char* dst = s;
1041 for (int j = 0; j < count; j++) {
1042 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1043 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1044 dst += offset;
1045 length -= offset;
1046 }
1047 return (const char*) s;
1048 }
1049
1050 void Arguments::print_on(outputStream* st) {
1051 st->print_cr("VM Arguments:");
1052 if (num_jvm_flags() > 0) {
1053 st->print("jvm_flags: "); print_jvm_flags_on(st);
1054 st->cr();
1055 }
1056 if (num_jvm_args() > 0) {
1057 st->print("jvm_args: "); print_jvm_args_on(st);
1058 st->cr();
1059 }
1060 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1061 if (_java_class_path != nullptr) {
1062 char* path = _java_class_path->value();
1063 size_t len = strlen(path);
1064 st->print("java_class_path (initial): ");
1065 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1066 if (len == 0) {
1067 st->print_raw_cr("<not set>");
1068 } else {
1069 st->print_raw_cr(path, len);
1070 }
1071 }
1072 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1073 }
1074
1075 void Arguments::print_summary_on(outputStream* st) {
1076 // Print the command line. Environment variables that are helpful for
1077 // reproducing the problem are written later in the hs_err file.
1078 // flags are from setting file
1079 if (num_jvm_flags() > 0) {
1080 st->print_raw("Settings File: ");
1081 print_jvm_flags_on(st);
1082 st->cr();
1083 }
1084 // args are the command line and environment variable arguments.
1085 st->print_raw("Command Line: ");
1086 if (num_jvm_args() > 0) {
1087 print_jvm_args_on(st);
1088 }
1089 // this is the classfile and any arguments to the java program
1090 if (java_command() != nullptr) {
1091 st->print("%s", java_command());
1092 }
1093 st->cr();
1094 }
1095
1096 void Arguments::set_jvm_flags_file(const char *value) {
1097 if (_jvm_flags_file != nullptr) {
1098 os::free(_jvm_flags_file);
1099 }
1100 _jvm_flags_file = os::strdup_check_oom(value);
1101 }
1102
1103 void Arguments::print_jvm_flags_on(outputStream* st) {
1104 if (_num_jvm_flags > 0) {
1105 for (int i=0; i < _num_jvm_flags; i++) {
1106 st->print("%s ", _jvm_flags_array[i]);
1107 }
1108 }
1109 }
1110
1111 void Arguments::print_jvm_args_on(outputStream* st) {
1112 if (_num_jvm_args > 0) {
1113 for (int i=0; i < _num_jvm_args; i++) {
1114 st->print("%s ", _jvm_args_array[i]);
1115 }
1116 }
1117 }
1118
1119 bool Arguments::process_argument(const char* arg,
1120 jboolean ignore_unrecognized,
1121 JVMFlagOrigin origin) {
1122 JDK_Version since = JDK_Version();
1123
1124 if (parse_argument(arg, origin)) {
1125 return true;
1126 }
1127
1128 // Determine if the flag has '+', '-', or '=' characters.
1129 bool has_plus_minus = (*arg == '+' || *arg == '-');
1130 const char* const argname = has_plus_minus ? arg + 1 : arg;
1131
1132 size_t arg_len;
1133 const char* equal_sign = strchr(argname, '=');
1134 if (equal_sign == nullptr) {
1135 arg_len = strlen(argname);
1136 } else {
1137 arg_len = equal_sign - argname;
1138 }
1139
1140 // Only make the obsolete check for valid arguments.
1141 if (arg_len <= BUFLEN) {
1142 // Construct a string which consists only of the argument name without '+', '-', or '='.
1143 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1144 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1145 if (is_obsolete_flag(stripped_argname, &since)) {
1146 char version[256];
1147 since.to_string(version, sizeof(version));
1148 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1149 return true;
1150 }
1151 }
1152
1153 // For locked flags, report a custom error message if available.
1154 // Otherwise, report the standard unrecognized VM option.
1155 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1156 if (found_flag != nullptr) {
1157 char locked_message_buf[BUFLEN];
1158 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1159 if (strlen(locked_message_buf) != 0) {
1160 #ifdef PRODUCT
1161 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1162 if (ignore_unrecognized && mismatched) {
1163 return true;
1164 }
1165 #endif
1166 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1167 }
1168 if (found_flag->is_bool() && !has_plus_minus) {
1169 jio_fprintf(defaultStream::error_stream(),
1170 "Missing +/- setting for VM option '%s'\n", argname);
1171 } else if (!found_flag->is_bool() && has_plus_minus) {
1172 jio_fprintf(defaultStream::error_stream(),
1173 "Unexpected +/- setting in VM option '%s'\n", argname);
1174 } else {
1175 jio_fprintf(defaultStream::error_stream(),
1176 "Improperly specified VM option '%s'\n", argname);
1177 }
1178 } else {
1179 if (ignore_unrecognized) {
1180 return true;
1181 }
1182 jio_fprintf(defaultStream::error_stream(),
1183 "Unrecognized VM option '%s'\n", argname);
1184 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1185 if (fuzzy_matched != nullptr) {
1186 jio_fprintf(defaultStream::error_stream(),
1187 "Did you mean '%s%s%s'?\n",
1188 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1189 fuzzy_matched->name(),
1190 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1191 }
1192 }
1193
1194 // allow for commandline "commenting out" options like -XX:#+Verbose
1195 return arg[0] == '#';
1196 }
1197
1198 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1199 FILE* stream = os::fopen(file_name, "rb");
1200 if (stream == nullptr) {
1201 if (should_exist) {
1202 jio_fprintf(defaultStream::error_stream(),
1203 "Could not open settings file %s\n", file_name);
1204 return false;
1205 } else {
1206 return true;
1207 }
1208 }
1209
1210 char token[1024];
1211 size_t pos = 0;
1212
1213 bool in_white_space = true;
1214 bool in_comment = false;
1215 bool in_quote = false;
1216 char quote_c = 0;
1217 bool result = true;
1218
1219 int c_or_eof = getc(stream);
1220 while (c_or_eof != EOF && pos < (sizeof(token) - 1)) {
1221 // We have checked the c_or_eof for EOF. getc should only ever return the
1222 // EOF or an unsigned char converted to an int. We cast down to a char to
1223 // avoid the char to int promotions we would otherwise do in the comparisons
1224 // below (which would be incorrect if we ever compared to a non-ascii char),
1225 // and the int to char conversions we would otherwise do in the assignments.
1226 const char c = static_cast<char>(c_or_eof);
1227 if (in_white_space) {
1228 if (in_comment) {
1229 if (c == '\n') in_comment = false;
1230 } else {
1231 if (c == '#') in_comment = true;
1232 else if (!isspace((unsigned char) c)) {
1233 in_white_space = false;
1234 token[pos++] = c;
1235 }
1236 }
1237 } else {
1238 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1239 // token ends at newline, or at unquoted whitespace
1240 // this allows a way to include spaces in string-valued options
1241 token[pos] = '\0';
1242 logOption(token);
1243 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1244 build_jvm_flags(token);
1245 pos = 0;
1246 in_white_space = true;
1247 in_quote = false;
1248 } else if (!in_quote && (c == '\'' || c == '"')) {
1249 in_quote = true;
1250 quote_c = c;
1251 } else if (in_quote && (c == quote_c)) {
1252 in_quote = false;
1253 } else {
1254 token[pos++] = c;
1255 }
1256 }
1257 c_or_eof = getc(stream);
1258 }
1259 if (pos > 0) {
1260 token[pos] = '\0';
1261 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1262 build_jvm_flags(token);
1263 }
1264 fclose(stream);
1265 return result;
1266 }
1267
1268 //=============================================================================================================
1269 // Parsing of properties (-D)
1270
1271 const char* Arguments::get_property(const char* key) {
1272 return PropertyList_get_value(system_properties(), key);
1273 }
1274
1275 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1276 const char* eq = strchr(prop, '=');
1277 const char* key;
1278 const char* value = "";
1279
1280 if (eq == nullptr) {
1281 // property doesn't have a value, thus use passed string
1282 key = prop;
1283 } else {
1284 // property have a value, thus extract it and save to the
1285 // allocated string
1286 size_t key_len = eq - prop;
1287 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1288
1289 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1290 key = tmp_key;
1291
1292 value = &prop[key_len + 1];
1293 }
1294
1295 if (internal == ExternalProperty) {
1296 CDSConfig::check_incompatible_property(key, value);
1297 }
1298
1299 if (strcmp(key, "java.compiler") == 0) {
1300 // we no longer support java.compiler system property, log a warning and let it get
1301 // passed to Java, like any other system property
1302 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1303 // for applications using NONE or empty value, log a more informative message
1304 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1305 } else {
1306 warning("The java.compiler system property is obsolete and no longer supported.");
1307 }
1308 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1309 // append is true, writable is true, internal is false
1310 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1311 WriteableProperty, ExternalProperty);
1312 } else {
1313 if (strcmp(key, "sun.java.command") == 0) {
1314 char *old_java_command = _java_command;
1315 _java_command = os::strdup_check_oom(value, mtArguments);
1316 if (old_java_command != nullptr) {
1317 os::free(old_java_command);
1318 }
1319 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1320 // If this property is set on the command line then its value will be
1321 // displayed in VM error logs as the URL at which to submit such logs.
1322 // Normally the URL displayed in error logs is different from the value
1323 // of this system property, so a different property should have been
1324 // used here, but we leave this as-is in case someone depends upon it.
1325 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1326 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1327 // its value without going through the property list or making a Java call.
1328 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1329 if (old_java_vendor_url_bug != nullptr) {
1330 os::free((void *)old_java_vendor_url_bug);
1331 }
1332 }
1333
1334 // Create new property and add at the end of the list
1335 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1336 }
1337
1338 if (key != prop) {
1339 // SystemProperty copy passed value, thus free previously allocated
1340 // memory
1341 FreeHeap((void *)key);
1342 }
1343
1344 return true;
1345 }
1346
1347 //===========================================================================================================
1348 // Setting int/mixed/comp mode flags
1349
1350 void Arguments::set_mode_flags(Mode mode) {
1351 // Set up default values for all flags.
1352 // If you add a flag to any of the branches below,
1353 // add a default value for it here.
1354 _mode = mode;
1355
1356 // Ensure Agent_OnLoad has the correct initial values.
1357 // This may not be the final mode; mode may change later in onload phase.
1358 PropertyList_unique_add(&_system_properties, "java.vm.info",
1359 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1360
1361 UseInterpreter = true;
1362 UseCompiler = true;
1363 UseLoopCounter = true;
1364
1365 // Default values may be platform/compiler dependent -
1366 // use the saved values
1367 ClipInlining = Arguments::_ClipInlining;
1368 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1369 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1370 BackgroundCompilation = Arguments::_BackgroundCompilation;
1371
1372 // Change from defaults based on mode
1373 switch (mode) {
1374 default:
1375 ShouldNotReachHere();
1376 break;
1377 case _int:
1378 UseCompiler = false;
1379 UseLoopCounter = false;
1380 AlwaysCompileLoopMethods = false;
1381 UseOnStackReplacement = false;
1382 break;
1383 case _mixed:
1384 // same as default
1385 break;
1386 case _comp:
1387 UseInterpreter = false;
1388 BackgroundCompilation = false;
1389 ClipInlining = false;
1390 break;
1391 }
1392 }
1393
1394 // Conflict: required to use shared spaces (-Xshare:on), but
1395 // incompatible command line options were chosen.
1396 void Arguments::no_shared_spaces(const char* message) {
1397 if (RequireSharedSpaces) {
1398 aot_log_error(aot)("%s is incompatible with other specified options.",
1399 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1400 if (CDSConfig::new_aot_flags_used()) {
1401 vm_exit_during_initialization("Unable to use AOT cache", message);
1402 } else {
1403 vm_exit_during_initialization("Unable to use shared archive", message);
1404 }
1405 } else {
1406 if (CDSConfig::new_aot_flags_used()) {
1407 log_warning(aot)("Unable to use AOT cache: %s", message);
1408 } else {
1409 aot_log_info(aot)("Unable to use shared archive: %s", message);
1410 }
1411 UseSharedSpaces = false;
1412 }
1413 }
1414
1415 static void set_object_alignment() {
1416 // Object alignment.
1417 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1418 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1419 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1420 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1421 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1422 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1423
1424 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1425 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1426
1427 // Oop encoding heap max
1428 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1429 }
1430
1431 size_t Arguments::max_heap_for_compressed_oops() {
1432 // Avoid sign flip.
1433 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1434 // We need to fit both the null page and the heap into the memory budget, while
1435 // keeping alignment constraints of the heap. To guarantee the latter, as the
1436 // null page is located before the heap, we pad the null page to the conservative
1437 // maximum alignment that the GC may ever impose upon the heap.
1438 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1439 _conservative_max_heap_alignment);
1440
1441 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1442 NOT_LP64(ShouldNotReachHere(); return 0);
1443 }
1444
1445 void Arguments::set_use_compressed_oops() {
1446 #ifdef _LP64
1447 // MaxHeapSize is not set up properly at this point, but
1448 // the only value that can override MaxHeapSize if we are
1449 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1450 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1451
1452 if (max_heap_size <= max_heap_for_compressed_oops()) {
1453 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1454 FLAG_SET_ERGO(UseCompressedOops, true);
1455 }
1456 } else {
1457 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1458 warning("Max heap size too large for Compressed Oops");
1459 FLAG_SET_DEFAULT(UseCompressedOops, false);
1460 }
1461 }
1462 #endif // _LP64
1463 }
1464
1465 void Arguments::set_conservative_max_heap_alignment() {
1466 // The conservative maximum required alignment for the heap is the maximum of
1467 // the alignments imposed by several sources: any requirements from the heap
1468 // itself and the maximum page size we may run the VM with.
1469 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1470 _conservative_max_heap_alignment = MAX3(heap_alignment,
1471 os::vm_allocation_granularity(),
1472 os::max_page_size());
1473 assert(is_power_of_2(_conservative_max_heap_alignment), "Expected to be a power-of-2");
1474 }
1475
1476 jint Arguments::set_ergonomics_flags() {
1477 GCConfig::initialize();
1478
1479 set_conservative_max_heap_alignment();
1480
1481 #ifdef _LP64
1482 set_use_compressed_oops();
1483
1484 // Also checks that certain machines are slower with compressed oops
1485 // in vm_version initialization code.
1486 #endif // _LP64
1487
1488 return JNI_OK;
1489 }
1490
1491 // This must be called after ergonomics.
1492 void Arguments::set_bytecode_flags() {
1493 if (!RewriteBytecodes) {
1494 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1495 }
1496 }
1497
1498 // Aggressive optimization flags
1499 jint Arguments::set_aggressive_opts_flags() {
1500 #ifdef COMPILER2
1501 if (AggressiveUnboxing) {
1502 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1503 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1504 } else if (!EliminateAutoBox) {
1505 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1506 AggressiveUnboxing = false;
1507 }
1508 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1509 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1510 } else if (!DoEscapeAnalysis) {
1511 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1512 AggressiveUnboxing = false;
1513 }
1514 }
1515 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1516 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1517 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1518 }
1519 // Feed the cache size setting into the JDK
1520 char buffer[1024];
1521 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1522 if (!add_property(buffer)) {
1523 return JNI_ENOMEM;
1524 }
1525 }
1526 #endif
1527
1528 return JNI_OK;
1529 }
1530
1531 //===========================================================================================================
1532
1533 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1534 if (_sun_java_launcher != _default_java_launcher) {
1535 os::free(const_cast<char*>(_sun_java_launcher));
1536 }
1537 _sun_java_launcher = os::strdup_check_oom(launcher);
1538 }
1539
1540 bool Arguments::created_by_java_launcher() {
1541 assert(_sun_java_launcher != nullptr, "property must have value");
1542 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1543 }
1544
1545 bool Arguments::executing_unit_tests() {
1546 return _executing_unit_tests;
1547 }
1548
1549 //===========================================================================================================
1550 // Parsing of main arguments
1551
1552 static unsigned int addreads_count = 0;
1553 static unsigned int addexports_count = 0;
1554 static unsigned int addopens_count = 0;
1555 static unsigned int patch_mod_count = 0;
1556 static unsigned int enable_native_access_count = 0;
1557 static unsigned int enable_final_field_mutation = 0;
1558 static bool patch_mod_javabase = false;
1559
1560 // Check the consistency of vm_init_args
1561 bool Arguments::check_vm_args_consistency() {
1562 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1563 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
1564 return false;
1565 }
1566
1567 // Method for adding checks for flag consistency.
1568 // The intent is to warn the user of all possible conflicts,
1569 // before returning an error.
1570 // Note: Needs platform-dependent factoring.
1571 bool status = true;
1572
1573 status = CompilerConfig::check_args_consistency(status);
1574 #if INCLUDE_JVMCI
1575 if (status && EnableJVMCI) {
1576 // Add the JVMCI module if not using libjvmci or EnableJVMCI
1577 // was explicitly set on the command line or in the jimage.
1578 if ((!UseJVMCINativeLibrary || FLAG_IS_CMDLINE(EnableJVMCI) || FLAG_IS_JIMAGE_RESOURCE(EnableJVMCI)) && ClassLoader::is_module_observable("jdk.internal.vm.ci") && !_jvmci_module_added) {
1579 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1580 return false;
1581 }
1582 }
1583 }
1584 #endif
1585
1586 #if INCLUDE_JFR
1587 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1588 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1589 return false;
1590 }
1591 }
1592 #endif
1593
1594 #ifndef SUPPORT_RESERVED_STACK_AREA
1595 if (StackReservedPages != 0) {
1596 FLAG_SET_CMDLINE(StackReservedPages, 0);
1597 warning("Reserved Stack Area not supported on this platform");
1598 }
1599 #endif
1600
1601 return status;
1602 }
1603
1604 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1605 const char* option_type) {
1606 if (ignore) return false;
1607
1608 const char* spacer = " ";
1609 if (option_type == nullptr) {
1610 option_type = ++spacer; // Set both to the empty string.
1611 }
1612
1613 jio_fprintf(defaultStream::error_stream(),
1614 "Unrecognized %s%soption: %s\n", option_type, spacer,
1615 option->optionString);
1616 return true;
1617 }
1618
1619 static const char* user_assertion_options[] = {
1620 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1621 };
1622
1623 static const char* system_assertion_options[] = {
1624 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1625 };
1626
1627 bool Arguments::parse_uint(const char* value,
1628 uint* uint_arg,
1629 uint min_size) {
1630 uint n;
1631 if (!parse_integer(value, &n)) {
1632 return false;
1633 }
1634 if (n >= min_size) {
1635 *uint_arg = n;
1636 return true;
1637 } else {
1638 return false;
1639 }
1640 }
1641
1642 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1643 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1644 CDSConfig::check_internal_module_property(prop_name, prop_value);
1645 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1646 char* property = AllocateHeap(prop_len, mtArguments);
1647 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1648 if (ret < 0 || ret >= (int)prop_len) {
1649 FreeHeap(property);
1650 return false;
1651 }
1652 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1653 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1654 // that multiple occurrences of the associated flag just causes the existing property value to be
1655 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1656 // to a property after we have finished flag processing.
1657 bool added = add_property(property, WriteableProperty, internal);
1658 FreeHeap(property);
1659 return added;
1660 }
1661
1662 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1663 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1664 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1665 const unsigned int props_count_limit = 1000;
1666 const int max_digits = 3;
1667 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1668
1669 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1670 if (count < props_count_limit) {
1671 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1672 char* property = AllocateHeap(prop_len, mtArguments);
1673 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1674 if (ret < 0 || ret >= (int)prop_len) {
1675 FreeHeap(property);
1676 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1677 return false;
1678 }
1679 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1680 FreeHeap(property);
1681 return added;
1682 }
1683
1684 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1685 return false;
1686 }
1687
1688 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1689 julong* long_arg,
1690 julong min_size,
1691 julong max_size) {
1692 if (!parse_integer(s, long_arg)) return arg_unreadable;
1693 return check_memory_size(*long_arg, min_size, max_size);
1694 }
1695
1696 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) {
1697 // Save default settings for some mode flags
1698 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1699 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1700 Arguments::_ClipInlining = ClipInlining;
1701 Arguments::_BackgroundCompilation = BackgroundCompilation;
1702
1703 // Remember the default value of SharedBaseAddress.
1704 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1705
1706 // Setup flags for mixed which is the default
1707 set_mode_flags(_mixed);
1708
1709 jint result;
1710 for (int i = 0; i < all_args->length(); i++) {
1711 result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin);
1712 if (result != JNI_OK) {
1713 return result;
1714 }
1715 }
1716
1717 // Disable CDS for exploded image
1718 if (!has_jimage()) {
1719 no_shared_spaces("CDS disabled on exploded JDK");
1720 }
1721
1722 // We need to ensure processor and memory resources have been properly
1723 // configured - which may rely on arguments we just processed - before
1724 // doing the final argument processing. Any argument processing that
1725 // needs to know about processor and memory resources must occur after
1726 // this point.
1727
1728 os::init_container_support();
1729
1730 SystemMemoryBarrier::initialize();
1731
1732 // Do final processing now that all arguments have been parsed
1733 result = finalize_vm_init_args();
1734 if (result != JNI_OK) {
1735 return result;
1736 }
1737
1738 return JNI_OK;
1739 }
1740
1741 #if !INCLUDE_JVMTI || INCLUDE_CDS
1742 // Checks if name in command-line argument -agent{lib,path}:name[=options]
1743 // represents a valid JDWP agent. is_path==true denotes that we
1744 // are dealing with -agentpath (case where name is a path), otherwise with
1745 // -agentlib
1746 static bool valid_jdwp_agent(char *name, bool is_path) {
1747 char *_name;
1748 const char *_jdwp = "jdwp";
1749 size_t _len_jdwp, _len_prefix;
1750
1751 if (is_path) {
1752 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
1753 return false;
1754 }
1755
1756 _name++; // skip past last path separator
1757 _len_prefix = strlen(JNI_LIB_PREFIX);
1758
1759 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
1760 return false;
1761 }
1762
1763 _name += _len_prefix;
1764 _len_jdwp = strlen(_jdwp);
1765
1766 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
1767 _name += _len_jdwp;
1768 }
1769 else {
1770 return false;
1771 }
1772
1773 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
1774 return false;
1775 }
1776
1777 return true;
1778 }
1779
1780 if (strcmp(name, _jdwp) == 0) {
1781 return true;
1782 }
1783
1784 return false;
1785 }
1786 #endif
1787
1788 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
1789 // --patch-module=<module>=<file>(<pathsep><file>)*
1790 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
1791 // Find the equal sign between the module name and the path specification
1792 const char* module_equal = strchr(patch_mod_tail, '=');
1793 if (module_equal == nullptr) {
1794 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
1795 return JNI_ERR;
1796 } else {
1797 // Pick out the module name
1798 size_t module_len = module_equal - patch_mod_tail;
1799 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
1800 if (module_name != nullptr) {
1801 memcpy(module_name, patch_mod_tail, module_len);
1802 *(module_name + module_len) = '\0';
1803 // The path piece begins one past the module_equal sign
1804 add_patch_mod_prefix(module_name, module_equal + 1);
1805 FREE_C_HEAP_ARRAY(module_name);
1806 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
1807 return JNI_ENOMEM;
1808 }
1809 } else {
1810 return JNI_ENOMEM;
1811 }
1812 }
1813 return JNI_OK;
1814 }
1815
1816 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
1817 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
1818 // The min and max sizes match the values in globals.hpp, but scaled
1819 // with K. The values have been chosen so that alignment with page
1820 // size doesn't change the max value, which makes the conversions
1821 // back and forth between Xss value and ThreadStackSize value easier.
1822 // The values have also been chosen to fit inside a 32-bit signed type.
1823 const julong min_ThreadStackSize = 0;
1824 const julong max_ThreadStackSize = 1 * M;
1825
1826 // Make sure the above values match the range set in globals.hpp
1827 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
1828 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
1829 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
1830
1831 const julong min_size = min_ThreadStackSize * K;
1832 const julong max_size = max_ThreadStackSize * K;
1833
1834 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
1835
1836 julong size = 0;
1837 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
1838 if (errcode != arg_in_range) {
1839 bool silent = (option == nullptr); // Allow testing to silence error messages
1840 if (!silent) {
1841 jio_fprintf(defaultStream::error_stream(),
1842 "Invalid thread stack size: %s\n", option->optionString);
1843 describe_range_error(errcode);
1844 }
1845 return JNI_EINVAL;
1846 }
1847
1848 // Internally track ThreadStackSize in units of 1024 bytes.
1849 const julong size_aligned = align_up(size, K);
1850 assert(size <= size_aligned,
1851 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
1852 size, size_aligned);
1853
1854 const julong size_in_K = size_aligned / K;
1855 assert(size_in_K < (julong)max_intx,
1856 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
1857 size_in_K);
1858
1859 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
1860 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
1861 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
1862 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
1863 max_expanded, size_in_K);
1864
1865 *out_ThreadStackSize = (intx)size_in_K;
1866
1867 return JNI_OK;
1868 }
1869
1870 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
1871 // For match_option to return remaining or value part of option string
1872 const char* tail;
1873
1874 // iterate over arguments
1875 for (int index = 0; index < args->nOptions; index++) {
1876 bool is_absolute_path = false; // for -agentpath vs -agentlib
1877
1878 const JavaVMOption* option = args->options + index;
1879
1880 if (!match_option(option, "-Djava.class.path", &tail) &&
1881 !match_option(option, "-Dsun.java.command", &tail) &&
1882 !match_option(option, "-Dsun.java.launcher", &tail)) {
1883
1884 // add all jvm options to the jvm_args string. This string
1885 // is used later to set the java.vm.args PerfData string constant.
1886 // the -Djava.class.path and the -Dsun.java.command options are
1887 // omitted from jvm_args string as each have their own PerfData
1888 // string constant object.
1889 build_jvm_args(option->optionString);
1890 }
1891
1892 // -verbose:[class/module/gc/jni]
1893 if (match_option(option, "-verbose", &tail)) {
1894 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
1895 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
1896 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
1897 } else if (!strcmp(tail, ":module")) {
1898 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
1899 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
1900 } else if (!strcmp(tail, ":gc")) {
1901 if (_legacyGCLogging.lastFlag == 0) {
1902 _legacyGCLogging.lastFlag = 1;
1903 }
1904 } else if (!strcmp(tail, ":jni")) {
1905 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
1906 }
1907 // -da / -ea / -disableassertions / -enableassertions
1908 // These accept an optional class/package name separated by a colon, e.g.,
1909 // -da:java.lang.Thread.
1910 } else if (match_option(option, user_assertion_options, &tail, true)) {
1911 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1912 if (*tail == '\0') {
1913 JavaAssertions::setUserClassDefault(enable);
1914 } else {
1915 assert(*tail == ':', "bogus match by match_option()");
1916 JavaAssertions::addOption(tail + 1, enable);
1917 }
1918 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
1919 } else if (match_option(option, system_assertion_options, &tail, false)) {
1920 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1921 JavaAssertions::setSystemClassDefault(enable);
1922 // -bootclasspath:
1923 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
1924 jio_fprintf(defaultStream::output_stream(),
1925 "-Xbootclasspath is no longer a supported option.\n");
1926 return JNI_EINVAL;
1927 // -bootclasspath/a:
1928 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
1929 Arguments::append_sysclasspath(tail);
1930 // -bootclasspath/p:
1931 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
1932 jio_fprintf(defaultStream::output_stream(),
1933 "-Xbootclasspath/p is no longer a supported option.\n");
1934 return JNI_EINVAL;
1935 // -Xrun
1936 } else if (match_option(option, "-Xrun", &tail)) {
1937 if (tail != nullptr) {
1938 const char* pos = strchr(tail, ':');
1939 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
1940 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
1941 jio_snprintf(name, len + 1, "%s", tail);
1942
1943 char *options = nullptr;
1944 if(pos != nullptr) {
1945 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
1946 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
1947 }
1948 #if !INCLUDE_JVMTI
1949 if (strcmp(name, "jdwp") == 0) {
1950 jio_fprintf(defaultStream::error_stream(),
1951 "Debugging agents are not supported in this VM\n");
1952 return JNI_ERR;
1953 }
1954 #endif // !INCLUDE_JVMTI
1955 JvmtiAgentList::add_xrun(name, options, false);
1956 FREE_C_HEAP_ARRAY(name);
1957 FREE_C_HEAP_ARRAY(options);
1958 }
1959 } else if (match_option(option, "--add-reads=", &tail)) {
1960 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
1961 return JNI_ENOMEM;
1962 }
1963 } else if (match_option(option, "--add-exports=", &tail)) {
1964 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
1965 return JNI_ENOMEM;
1966 }
1967 } else if (match_option(option, "--add-opens=", &tail)) {
1968 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
1969 return JNI_ENOMEM;
1970 }
1971 } else if (match_option(option, "--add-modules=", &tail)) {
1972 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
1973 return JNI_ENOMEM;
1974 }
1975 #if INCLUDE_JVMCI
1976 if (!_jvmci_module_added) {
1977 const char *jvmci_module = strstr(tail, "jdk.internal.vm.ci");
1978 if (jvmci_module != nullptr) {
1979 char before = *(jvmci_module - 1);
1980 char after = *(jvmci_module + strlen("jdk.internal.vm.ci"));
1981 if ((before == '=' || before == ',') && (after == '\0' || after == ',')) {
1982 FLAG_SET_DEFAULT(EnableJVMCI, true);
1983 _jvmci_module_added = true;
1984 }
1985 }
1986 }
1987 #endif
1988 } else if (match_option(option, "--enable-native-access=", &tail)) {
1989 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
1990 return JNI_ENOMEM;
1991 }
1992 } else if (match_option(option, "--illegal-native-access=", &tail)) {
1993 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
1994 return JNI_ENOMEM;
1995 }
1996 } else if (match_option(option, "--limit-modules=", &tail)) {
1997 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
1998 return JNI_ENOMEM;
1999 }
2000 } else if (match_option(option, "--module-path=", &tail)) {
2001 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2002 return JNI_ENOMEM;
2003 }
2004 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2005 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2006 return JNI_ENOMEM;
2007 }
2008 } else if (match_option(option, "--patch-module=", &tail)) {
2009 // --patch-module=<module>=<file>(<pathsep><file>)*
2010 int res = process_patch_mod_option(tail);
2011 if (res != JNI_OK) {
2012 return res;
2013 }
2014 } else if (match_option(option, "--enable-final-field-mutation=", &tail)) {
2015 if (!create_numbered_module_property("jdk.module.enable.final.field.mutation", tail, enable_final_field_mutation++)) {
2016 return JNI_ENOMEM;
2017 }
2018 } else if (match_option(option, "--illegal-final-field-mutation=", &tail)) {
2019 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2020 PropertyList_unique_add(&_system_properties, "jdk.module.illegal.final.field.mutation", tail,
2021 AddProperty, WriteableProperty, InternalProperty);
2022 } else {
2023 jio_fprintf(defaultStream::error_stream(),
2024 "Value specified to --illegal-final-field-mutation not recognized: '%s'\n", tail);
2025 return JNI_ERR;
2026 }
2027 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2028 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2029 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2030 AddProperty, WriteableProperty, InternalProperty);
2031 } else {
2032 jio_fprintf(defaultStream::error_stream(),
2033 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2034 return JNI_ERR;
2035 }
2036 } else if (match_option(option, "--illegal-access=", &tail)) {
2037 char version[256];
2038 JDK_Version::jdk(17).to_string(version, sizeof(version));
2039 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2040 // -agentlib and -agentpath
2041 } else if (match_option(option, "-agentlib:", &tail) ||
2042 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2043 if(tail != nullptr) {
2044 const char* pos = strchr(tail, '=');
2045 char* name;
2046 if (pos == nullptr) {
2047 name = os::strdup_check_oom(tail, mtArguments);
2048 } else {
2049 size_t len = pos - tail;
2050 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2051 memcpy(name, tail, len);
2052 name[len] = '\0';
2053 }
2054
2055 char *options = nullptr;
2056 if(pos != nullptr) {
2057 options = os::strdup_check_oom(pos + 1, mtArguments);
2058 }
2059 #if !INCLUDE_JVMTI
2060 if (valid_jdwp_agent(name, is_absolute_path)) {
2061 jio_fprintf(defaultStream::error_stream(),
2062 "Debugging agents are not supported in this VM\n");
2063 return JNI_ERR;
2064 }
2065 #elif INCLUDE_CDS
2066 if (valid_jdwp_agent(name, is_absolute_path)) {
2067 _has_jdwp_agent = true;
2068 }
2069 #endif // !INCLUDE_JVMTI
2070 JvmtiAgentList::add(name, options, is_absolute_path);
2071 os::free(name);
2072 os::free(options);
2073 }
2074 // -javaagent
2075 } else if (match_option(option, "-javaagent:", &tail)) {
2076 #if !INCLUDE_JVMTI
2077 jio_fprintf(defaultStream::error_stream(),
2078 "Instrumentation agents are not supported in this VM\n");
2079 return JNI_ERR;
2080 #else
2081 if (tail != nullptr) {
2082 size_t length = strlen(tail) + 1;
2083 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2084 jio_snprintf(options, length, "%s", tail);
2085 JvmtiAgentList::add("instrument", options, false);
2086 FREE_C_HEAP_ARRAY(options);
2087
2088 // java agents need module java.instrument
2089 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2090 return JNI_ENOMEM;
2091 }
2092 }
2093 #endif // !INCLUDE_JVMTI
2094 // --enable_preview
2095 } else if (match_option(option, "--enable-preview")) {
2096 set_enable_preview();
2097 // -Xnoclassgc
2098 } else if (match_option(option, "-Xnoclassgc")) {
2099 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2100 return JNI_EINVAL;
2101 }
2102 // -Xbatch
2103 } else if (match_option(option, "-Xbatch")) {
2104 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2105 return JNI_EINVAL;
2106 }
2107 // -Xmn for compatibility with other JVM vendors
2108 } else if (match_option(option, "-Xmn", &tail)) {
2109 julong long_initial_young_size = 0;
2110 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2111 if (errcode != arg_in_range) {
2112 jio_fprintf(defaultStream::error_stream(),
2113 "Invalid initial young generation size: %s\n", option->optionString);
2114 describe_range_error(errcode);
2115 return JNI_EINVAL;
2116 }
2117 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2118 return JNI_EINVAL;
2119 }
2120 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2121 return JNI_EINVAL;
2122 }
2123 // -Xms
2124 } else if (match_option(option, "-Xms", &tail)) {
2125 julong size = 0;
2126 // an initial heap size of 0 means automatically determine
2127 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2128 if (errcode != arg_in_range) {
2129 jio_fprintf(defaultStream::error_stream(),
2130 "Invalid initial heap size: %s\n", option->optionString);
2131 describe_range_error(errcode);
2132 return JNI_EINVAL;
2133 }
2134 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2135 return JNI_EINVAL;
2136 }
2137 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2138 return JNI_EINVAL;
2139 }
2140 // -Xmx
2141 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2142 julong long_max_heap_size = 0;
2143 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2144 if (errcode != arg_in_range) {
2145 jio_fprintf(defaultStream::error_stream(),
2146 "Invalid maximum heap size: %s\n", option->optionString);
2147 describe_range_error(errcode);
2148 return JNI_EINVAL;
2149 }
2150 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2151 return JNI_EINVAL;
2152 }
2153 // Xmaxf
2154 } else if (match_option(option, "-Xmaxf", &tail)) {
2155 char* err;
2156 double dmaxf = strtod(tail, &err);
2157 if (*err != '\0' || *tail == '\0') {
2158 jio_fprintf(defaultStream::error_stream(),
2159 "Bad max heap free ratio: %s\n",
2160 option->optionString);
2161 return JNI_EINVAL;
2162 }
2163 if (dmaxf < 0.0 || dmaxf > 1.0) {
2164 jio_fprintf(defaultStream::error_stream(),
2165 "-Xmaxf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2166 option->optionString);
2167 return JNI_EINVAL;
2168 }
2169 const uintx umaxf = (uintx)(dmaxf * 100);
2170 if (MinHeapFreeRatio > umaxf) {
2171 jio_fprintf(defaultStream::error_stream(),
2172 "-Xmaxf value (%s) must be greater than or equal to the implicit -Xminf value (%.2f)\n",
2173 tail, MinHeapFreeRatio / 100.0f);
2174 return JNI_EINVAL;
2175 }
2176 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, umaxf) != JVMFlag::SUCCESS) {
2177 return JNI_EINVAL;
2178 }
2179 // Xminf
2180 } else if (match_option(option, "-Xminf", &tail)) {
2181 char* err;
2182 double dminf = strtod(tail, &err);
2183 if (*err != '\0' || *tail == '\0') {
2184 jio_fprintf(defaultStream::error_stream(),
2185 "Bad min heap free ratio: %s\n",
2186 option->optionString);
2187 return JNI_EINVAL;
2188 }
2189 if (dminf < 0.0 || dminf > 1.0) {
2190 jio_fprintf(defaultStream::error_stream(),
2191 "-Xminf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2192 tail);
2193 return JNI_EINVAL;
2194 }
2195 const uintx uminf = (uintx)(dminf * 100);
2196 if (MaxHeapFreeRatio < uminf) {
2197 jio_fprintf(defaultStream::error_stream(),
2198 "-Xminf value (%s) must be less than or equal to the implicit -Xmaxf value (%.2f)\n",
2199 tail, MaxHeapFreeRatio / 100.0f);
2200 return JNI_EINVAL;
2201 }
2202 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, uminf) != JVMFlag::SUCCESS) {
2203 return JNI_EINVAL;
2204 }
2205 // -Xss
2206 } else if (match_option(option, "-Xss", &tail)) {
2207 intx value = 0;
2208 jint err = parse_xss(option, tail, &value);
2209 if (err != JNI_OK) {
2210 return err;
2211 }
2212 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2213 return JNI_EINVAL;
2214 }
2215 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2216 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2217 if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2218 warning("Option -Xmaxjitcodesize was deprecated in JDK 26 and will likely be removed in a future release.");
2219 }
2220 julong long_ReservedCodeCacheSize = 0;
2221
2222 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2223 if (errcode != arg_in_range) {
2224 jio_fprintf(defaultStream::error_stream(),
2225 "Invalid maximum code cache size: %s.\n", option->optionString);
2226 return JNI_EINVAL;
2227 }
2228 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2229 return JNI_EINVAL;
2230 }
2231 // -green
2232 } else if (match_option(option, "-green")) {
2233 jio_fprintf(defaultStream::error_stream(),
2234 "Green threads support not available\n");
2235 return JNI_EINVAL;
2236 // -native
2237 } else if (match_option(option, "-native")) {
2238 // HotSpot always uses native threads, ignore silently for compatibility
2239 // -Xrs
2240 } else if (match_option(option, "-Xrs")) {
2241 // Classic/EVM option, new functionality
2242 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2243 return JNI_EINVAL;
2244 }
2245 // -Xprof
2246 } else if (match_option(option, "-Xprof")) {
2247 char version[256];
2248 // Obsolete in JDK 10
2249 JDK_Version::jdk(10).to_string(version, sizeof(version));
2250 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2251 // -Xinternalversion
2252 } else if (match_option(option, "-Xinternalversion")) {
2253 jio_fprintf(defaultStream::output_stream(), "%s\n",
2254 VM_Version::internal_vm_info_string());
2255 vm_exit(0);
2256 #ifndef PRODUCT
2257 // -Xprintflags
2258 } else if (match_option(option, "-Xprintflags")) {
2259 JVMFlag::printFlags(tty, false);
2260 vm_exit(0);
2261 #endif
2262 // -D
2263 } else if (match_option(option, "-D", &tail)) {
2264 const char* value;
2265 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2266 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2267 // abort if -Djava.endorsed.dirs is set
2268 jio_fprintf(defaultStream::output_stream(),
2269 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2270 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2271 return JNI_EINVAL;
2272 }
2273 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2274 *value != '\0' && strcmp(value, "\"\"") != 0) {
2275 // abort if -Djava.ext.dirs is set
2276 jio_fprintf(defaultStream::output_stream(),
2277 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2278 return JNI_EINVAL;
2279 }
2280 // Check for module related properties. They must be set using the modules
2281 // options. For example: use "--add-modules=java.sql", not
2282 // "-Djdk.module.addmods=java.sql"
2283 if (is_internal_module_property(option->optionString + 2)) {
2284 needs_module_property_warning = true;
2285 continue;
2286 }
2287 if (!add_property(tail)) {
2288 return JNI_ENOMEM;
2289 }
2290 // Out of the box management support
2291 if (match_option(option, "-Dcom.sun.management", &tail)) {
2292 #if INCLUDE_MANAGEMENT
2293 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2294 return JNI_EINVAL;
2295 }
2296 // management agent in module jdk.management.agent
2297 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2298 return JNI_ENOMEM;
2299 }
2300 #else
2301 jio_fprintf(defaultStream::output_stream(),
2302 "-Dcom.sun.management is not supported in this VM.\n");
2303 return JNI_ERR;
2304 #endif
2305 }
2306 // -Xint
2307 } else if (match_option(option, "-Xint")) {
2308 set_mode_flags(_int);
2309 mode_flag_cmd_line = true;
2310 // -Xmixed
2311 } else if (match_option(option, "-Xmixed")) {
2312 set_mode_flags(_mixed);
2313 mode_flag_cmd_line = true;
2314 // -Xcomp
2315 } else if (match_option(option, "-Xcomp")) {
2316 // for testing the compiler; turn off all flags that inhibit compilation
2317 set_mode_flags(_comp);
2318 mode_flag_cmd_line = true;
2319 // -Xshare:dump
2320 } else if (match_option(option, "-Xshare:dump")) {
2321 CDSConfig::enable_dumping_static_archive();
2322 CDSConfig::set_old_cds_flags_used();
2323 // -Xshare:on
2324 } else if (match_option(option, "-Xshare:on")) {
2325 UseSharedSpaces = true;
2326 RequireSharedSpaces = true;
2327 CDSConfig::set_old_cds_flags_used();
2328 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2329 } else if (match_option(option, "-Xshare:auto")) {
2330 UseSharedSpaces = true;
2331 RequireSharedSpaces = false;
2332 xshare_auto_cmd_line = true;
2333 CDSConfig::set_old_cds_flags_used();
2334 // -Xshare:off
2335 } else if (match_option(option, "-Xshare:off")) {
2336 UseSharedSpaces = false;
2337 RequireSharedSpaces = false;
2338 CDSConfig::set_old_cds_flags_used();
2339 // -Xverify
2340 } else if (match_option(option, "-Xverify", &tail)) {
2341 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2342 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2343 return JNI_EINVAL;
2344 }
2345 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2346 return JNI_EINVAL;
2347 }
2348 } else if (strcmp(tail, ":remote") == 0) {
2349 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2350 return JNI_EINVAL;
2351 }
2352 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2353 return JNI_EINVAL;
2354 }
2355 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2356 return JNI_EINVAL;
2357 }
2358 // -Xdebug
2359 } else if (match_option(option, "-Xdebug")) {
2360 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2361 } else if (match_option(option, "-Xloggc:", &tail)) {
2362 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2363 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2364 _legacyGCLogging.lastFlag = 2;
2365 _legacyGCLogging.file = os::strdup_check_oom(tail);
2366 } else if (match_option(option, "-Xlog", &tail)) {
2367 bool ret = false;
2368 if (strcmp(tail, ":help") == 0) {
2369 fileStream stream(defaultStream::output_stream());
2370 LogConfiguration::print_command_line_help(&stream);
2371 vm_exit(0);
2372 } else if (strcmp(tail, ":disable") == 0) {
2373 LogConfiguration::disable_logging();
2374 ret = true;
2375 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2376 const char* async_tail = tail + strlen(":async");
2377 ret = LogConfiguration::parse_async_argument(async_tail);
2378 } else if (*tail == '\0') {
2379 ret = LogConfiguration::parse_command_line_arguments();
2380 assert(ret, "-Xlog without arguments should never fail to parse");
2381 } else if (*tail == ':') {
2382 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2383 }
2384 if (ret == false) {
2385 jio_fprintf(defaultStream::error_stream(),
2386 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2387 tail);
2388 return JNI_EINVAL;
2389 }
2390 // JNI hooks
2391 } else if (match_option(option, "-Xcheck", &tail)) {
2392 if (!strcmp(tail, ":jni")) {
2393 #if !INCLUDE_JNI_CHECK
2394 warning("JNI CHECKING is not supported in this VM");
2395 #else
2396 CheckJNICalls = true;
2397 #endif // INCLUDE_JNI_CHECK
2398 } else if (is_bad_option(option, args->ignoreUnrecognized,
2399 "check")) {
2400 return JNI_EINVAL;
2401 }
2402 } else if (match_option(option, "vfprintf")) {
2403 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2404 } else if (match_option(option, "exit")) {
2405 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2406 } else if (match_option(option, "abort")) {
2407 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2408 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2409 // and the last option wins.
2410 } else if (match_option(option, "-XX:+NeverTenure")) {
2411 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2412 return JNI_EINVAL;
2413 }
2414 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2415 return JNI_EINVAL;
2416 }
2417 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2418 return JNI_EINVAL;
2419 }
2420 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2421 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2422 return JNI_EINVAL;
2423 }
2424 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2425 return JNI_EINVAL;
2426 }
2427 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2428 return JNI_EINVAL;
2429 }
2430 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2431 uint max_tenuring_thresh = 0;
2432 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2433 jio_fprintf(defaultStream::error_stream(),
2434 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2435 return JNI_EINVAL;
2436 }
2437
2438 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2439 return JNI_EINVAL;
2440 }
2441
2442 if (MaxTenuringThreshold == 0) {
2443 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2444 return JNI_EINVAL;
2445 }
2446 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2447 return JNI_EINVAL;
2448 }
2449 } else {
2450 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2451 return JNI_EINVAL;
2452 }
2453 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2454 return JNI_EINVAL;
2455 }
2456 }
2457 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2458 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2459 return JNI_EINVAL;
2460 }
2461 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2462 return JNI_EINVAL;
2463 }
2464 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2465 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2466 return JNI_EINVAL;
2467 }
2468 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2469 return JNI_EINVAL;
2470 }
2471 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2472 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2473 return JNI_EINVAL;
2474 }
2475 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2476 return JNI_EINVAL;
2477 }
2478 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2479 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2480 return JNI_EINVAL;
2481 }
2482 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2483 return JNI_EINVAL;
2484 }
2485 } else if (match_option(option, "--finalization=", &tail)) {
2486 if (strcmp(tail, "enabled") == 0) {
2487 InstanceKlass::set_finalization_enabled(true);
2488 } else if (strcmp(tail, "disabled") == 0) {
2489 InstanceKlass::set_finalization_enabled(false);
2490 } else {
2491 jio_fprintf(defaultStream::error_stream(),
2492 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2493 tail);
2494 return JNI_EINVAL;
2495 }
2496 #if !defined(DTRACE_ENABLED)
2497 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2498 jio_fprintf(defaultStream::error_stream(),
2499 "DTraceMethodProbes flag is not applicable for this configuration\n");
2500 return JNI_EINVAL;
2501 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2502 jio_fprintf(defaultStream::error_stream(),
2503 "DTraceAllocProbes flag is not applicable for this configuration\n");
2504 return JNI_EINVAL;
2505 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2506 jio_fprintf(defaultStream::error_stream(),
2507 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2508 return JNI_EINVAL;
2509 #endif // !defined(DTRACE_ENABLED)
2510 #ifdef ASSERT
2511 } else if (match_option(option, "-XX:+FullGCALot")) {
2512 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2513 return JNI_EINVAL;
2514 }
2515 #endif
2516 #if !INCLUDE_MANAGEMENT
2517 } else if (match_option(option, "-XX:+ManagementServer")) {
2518 jio_fprintf(defaultStream::error_stream(),
2519 "ManagementServer is not supported in this VM.\n");
2520 return JNI_ERR;
2521 #endif // INCLUDE_MANAGEMENT
2522 #if INCLUDE_JVMCI
2523 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2524 if (EnableJVMCIProduct) {
2525 jio_fprintf(defaultStream::error_stream(),
2526 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2527 return JNI_EINVAL;
2528 }
2529 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2530 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2531 if (use_graal_jit) {
2532 const char* jvmci_compiler = get_property("jvmci.Compiler");
2533 if (jvmci_compiler != nullptr) {
2534 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2535 jio_fprintf(defaultStream::error_stream(),
2536 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2537 return JNI_ERR;
2538 }
2539 } else if (!add_property("jvmci.Compiler=graal")) {
2540 return JNI_ENOMEM;
2541 }
2542 }
2543
2544 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2545 if (EnableJVMCIProduct) {
2546 continue;
2547 }
2548 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2549 // Allow this flag if it has been unlocked.
2550 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2551 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2552 jio_fprintf(defaultStream::error_stream(),
2553 "Unable to enable JVMCI in product mode\n");
2554 return JNI_ERR;
2555 }
2556 }
2557 // The flag was locked so process normally to report that error
2558 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2559 return JNI_EINVAL;
2560 }
2561 #endif // INCLUDE_JVMCI
2562 #if INCLUDE_JFR
2563 } else if (match_jfr_option(&option)) {
2564 return JNI_EINVAL;
2565 #endif
2566 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2567 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2568 // already been handled
2569 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2570 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2571 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2572 return JNI_EINVAL;
2573 }
2574 }
2575 // Unknown option
2576 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2577 return JNI_ERR;
2578 }
2579 }
2580
2581 // PrintSharedArchiveAndExit will turn on
2582 // -Xshare:on
2583 // -Xlog:class+path=info
2584 if (PrintSharedArchiveAndExit) {
2585 UseSharedSpaces = true;
2586 RequireSharedSpaces = true;
2587 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2588 }
2589
2590 fix_appclasspath();
2591
2592 return JNI_OK;
2593 }
2594
2595 void Arguments::set_ext_dirs(char *value) {
2596 _ext_dirs = os::strdup_check_oom(value);
2597 }
2598
2599 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) {
2600 // For java.base check for duplicate --patch-module options being specified on the command line.
2601 // This check is only required for java.base, all other duplicate module specifications
2602 // will be checked during module system initialization. The module system initialization
2603 // will throw an ExceptionInInitializerError if this situation occurs.
2604 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2605 if (patch_mod_javabase) {
2606 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2607 } else {
2608 patch_mod_javabase = true;
2609 }
2610 }
2611
2612 // Create GrowableArray lazily, only if --patch-module has been specified
2613 if (_patch_mod_prefix == nullptr) {
2614 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2615 }
2616
2617 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2618 }
2619
2620 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2621 //
2622 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2623 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2624 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2625 // path is treated as the current directory.
2626 //
2627 // This causes problems with CDS, which requires that all directories specified in the classpath
2628 // must be empty. In most cases, applications do NOT want to load classes from the current
2629 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2630 // scripts compatible with CDS.
2631 void Arguments::fix_appclasspath() {
2632 if (IgnoreEmptyClassPaths) {
2633 const char separator = *os::path_separator();
2634 const char* src = _java_class_path->value();
2635
2636 // skip over all the leading empty paths
2637 while (*src == separator) {
2638 src ++;
2639 }
2640
2641 char* copy = os::strdup_check_oom(src, mtArguments);
2642
2643 // trim all trailing empty paths
2644 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2645 *tail = '\0';
2646 }
2647
2648 char from[3] = {separator, separator, '\0'};
2649 char to [2] = {separator, '\0'};
2650 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2651 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2652 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2653 }
2654
2655 _java_class_path->set_writeable_value(copy);
2656 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2657 }
2658 }
2659
2660 jint Arguments::finalize_vm_init_args() {
2661 // check if the default lib/endorsed directory exists; if so, error
2662 char path[JVM_MAXPATHLEN];
2663 const char* fileSep = os::file_separator();
2664 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2665
2666 DIR* dir = os::opendir(path);
2667 if (dir != nullptr) {
2668 jio_fprintf(defaultStream::output_stream(),
2669 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2670 "in modular form will be supported via the concept of upgradeable modules.\n");
2671 os::closedir(dir);
2672 return JNI_ERR;
2673 }
2674
2675 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2676 dir = os::opendir(path);
2677 if (dir != nullptr) {
2678 jio_fprintf(defaultStream::output_stream(),
2679 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2680 "Use -classpath instead.\n.");
2681 os::closedir(dir);
2682 return JNI_ERR;
2683 }
2684
2685 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2686 // but like -Xint, leave compilation thresholds unaffected.
2687 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2688 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2689 set_mode_flags(_int);
2690 }
2691
2692 #ifdef ZERO
2693 // Zero always runs in interpreted mode
2694 set_mode_flags(_int);
2695 #endif
2696
2697 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2698 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2699 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2700 }
2701
2702 #if !COMPILER2_OR_JVMCI
2703 // Don't degrade server performance for footprint
2704 if (FLAG_IS_DEFAULT(UseLargePages) &&
2705 MaxHeapSize < LargePageHeapSizeThreshold) {
2706 // No need for large granularity pages w/small heaps.
2707 // Note that large pages are enabled/disabled for both the
2708 // Java heap and the code cache.
2709 FLAG_SET_DEFAULT(UseLargePages, false);
2710 }
2711
2712 UNSUPPORTED_OPTION(ProfileInterpreter);
2713 #endif
2714
2715 // Parse the CompilationMode flag
2716 if (!CompilationModeFlag::initialize()) {
2717 return JNI_ERR;
2718 }
2719
2720 if (!check_vm_args_consistency()) {
2721 return JNI_ERR;
2722 }
2723
2724
2725 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2726 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2727 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2728
2729 return JNI_OK;
2730 }
2731
2732 // Helper class for controlling the lifetime of JavaVMInitArgs
2733 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2734 // deleted on the destruction of the ScopedVMInitArgs object.
2735 class ScopedVMInitArgs : public StackObj {
2736 private:
2737 JavaVMInitArgs _args;
2738 char* _container_name;
2739 bool _is_set;
2740 char* _vm_options_file_arg;
2741
2742 public:
2743 ScopedVMInitArgs(const char *container_name) {
2744 _args.version = JNI_VERSION_1_2;
2745 _args.nOptions = 0;
2746 _args.options = nullptr;
2747 _args.ignoreUnrecognized = false;
2748 _container_name = (char *)container_name;
2749 _is_set = false;
2750 _vm_options_file_arg = nullptr;
2751 }
2752
2753 // Populates the JavaVMInitArgs object represented by this
2754 // ScopedVMInitArgs object with the arguments in options. The
2755 // allocated memory is deleted by the destructor. If this method
2756 // returns anything other than JNI_OK, then this object is in a
2757 // partially constructed state, and should be abandoned.
2758 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
2759 _is_set = true;
2760 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
2761 JavaVMOption, options->length(), mtArguments);
2762 if (options_arr == nullptr) {
2763 return JNI_ENOMEM;
2764 }
2765 _args.options = options_arr;
2766
2767 for (int i = 0; i < options->length(); i++) {
2768 options_arr[i] = options->at(i);
2769 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
2770 if (options_arr[i].optionString == nullptr) {
2771 // Rely on the destructor to do cleanup.
2772 _args.nOptions = i;
2773 return JNI_ENOMEM;
2774 }
2775 }
2776
2777 _args.nOptions = options->length();
2778 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2779 return JNI_OK;
2780 }
2781
2782 JavaVMInitArgs* get() { return &_args; }
2783 char* container_name() { return _container_name; }
2784 bool is_set() { return _is_set; }
2785 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
2786 char* vm_options_file_arg() { return _vm_options_file_arg; }
2787
2788 void set_vm_options_file_arg(const char *vm_options_file_arg) {
2789 if (_vm_options_file_arg != nullptr) {
2790 os::free(_vm_options_file_arg);
2791 }
2792 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
2793 }
2794
2795 ~ScopedVMInitArgs() {
2796 if (_vm_options_file_arg != nullptr) {
2797 os::free(_vm_options_file_arg);
2798 }
2799 if (_args.options == nullptr) return;
2800 for (int i = 0; i < _args.nOptions; i++) {
2801 os::free(_args.options[i].optionString);
2802 }
2803 FREE_C_HEAP_ARRAY(_args.options);
2804 }
2805
2806 // Insert options into this option list, to replace option at
2807 // vm_options_file_pos (-XX:VMOptionsFile)
2808 jint insert(const JavaVMInitArgs* args,
2809 const JavaVMInitArgs* args_to_insert,
2810 const int vm_options_file_pos) {
2811 assert(_args.options == nullptr, "shouldn't be set yet");
2812 assert(args_to_insert->nOptions != 0, "there should be args to insert");
2813 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
2814
2815 int length = args->nOptions + args_to_insert->nOptions - 1;
2816 // Construct new option array
2817 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
2818 for (int i = 0; i < args->nOptions; i++) {
2819 if (i == vm_options_file_pos) {
2820 // insert the new options starting at the same place as the
2821 // -XX:VMOptionsFile option
2822 for (int j = 0; j < args_to_insert->nOptions; j++) {
2823 options.push(args_to_insert->options[j]);
2824 }
2825 } else {
2826 options.push(args->options[i]);
2827 }
2828 }
2829 // make into options array
2830 return set_args(&options);
2831 }
2832 };
2833
2834 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
2835 return parse_options_environment_variable("_JAVA_OPTIONS", args);
2836 }
2837
2838 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
2839 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
2840 }
2841
2842 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) {
2843 for (int index = args->nOptions - 1; index >= 0; index--) {
2844 JavaVMOption* option = args->options + index;
2845 if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) {
2846 return option;
2847 }
2848 }
2849
2850 return nullptr;
2851 }
2852
2853 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args,
2854 ScopedVMInitArgs* jdk_aot_vm_options_args) {
2855 // Don't bother scanning all the args if this env variable is not set
2856 if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) {
2857 return JNI_OK;
2858 }
2859
2860 // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value
2861 // of AOTMode.
2862 JavaVMOption* option = nullptr;
2863 for (int i = all_args->length() - 1; i >= 0; i--) {
2864 if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) {
2865 break;
2866 }
2867 }
2868
2869 if (option != nullptr) {
2870 // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet,
2871 // so its value is not reflected inside the global variable AOTMode.
2872 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) {
2873 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
2874 }
2875 } else {
2876 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode,
2877 // which would have been set inside process_settings_file();
2878 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) {
2879 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
2880 }
2881 }
2882
2883 return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args);
2884 }
2885
2886 jint Arguments::parse_options_environment_variable(const char* name,
2887 ScopedVMInitArgs* vm_args) {
2888 char *buffer = ::getenv(name);
2889
2890 // Don't check this environment variable if user has special privileges
2891 // (e.g. unix su command).
2892 if (buffer == nullptr || os::have_special_privileges()) {
2893 return JNI_OK;
2894 }
2895
2896 if ((buffer = os::strdup(buffer)) == nullptr) {
2897 return JNI_ENOMEM;
2898 }
2899
2900 jio_fprintf(defaultStream::error_stream(),
2901 "Picked up %s: %s\n", name, buffer);
2902
2903 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
2904
2905 os::free(buffer);
2906 return retcode;
2907 }
2908
2909 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
2910 // read file into buffer
2911 int fd = ::open(file_name, O_RDONLY);
2912 if (fd < 0) {
2913 jio_fprintf(defaultStream::error_stream(),
2914 "Could not open options file '%s'\n",
2915 file_name);
2916 return JNI_ERR;
2917 }
2918
2919 struct stat stbuf;
2920 int retcode = os::stat(file_name, &stbuf);
2921 if (retcode != 0) {
2922 jio_fprintf(defaultStream::error_stream(),
2923 "Could not stat options file '%s'\n",
2924 file_name);
2925 ::close(fd);
2926 return JNI_ERR;
2927 }
2928
2929 if (stbuf.st_size == 0) {
2930 // tell caller there is no option data and that is ok
2931 ::close(fd);
2932 return JNI_OK;
2933 }
2934
2935 // '+ 1' for null termination even with max bytes
2936 size_t bytes_alloc = stbuf.st_size + 1;
2937
2938 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
2939 if (nullptr == buf) {
2940 jio_fprintf(defaultStream::error_stream(),
2941 "Could not allocate read buffer for options file parse\n");
2942 ::close(fd);
2943 return JNI_ENOMEM;
2944 }
2945
2946 memset(buf, 0, bytes_alloc);
2947
2948 // Fill buffer
2949 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
2950 ::close(fd);
2951 if (bytes_read < 0) {
2952 FREE_C_HEAP_ARRAY(buf);
2953 jio_fprintf(defaultStream::error_stream(),
2954 "Could not read options file '%s'\n", file_name);
2955 return JNI_ERR;
2956 }
2957
2958 if (bytes_read == 0) {
2959 // tell caller there is no option data and that is ok
2960 FREE_C_HEAP_ARRAY(buf);
2961 return JNI_OK;
2962 }
2963
2964 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
2965
2966 FREE_C_HEAP_ARRAY(buf);
2967 return retcode;
2968 }
2969
2970 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
2971 // Construct option array
2972 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
2973
2974 // some pointers to help with parsing
2975 char *buffer_end = buffer + buf_len;
2976 char *opt_hd = buffer;
2977 char *wrt = buffer;
2978 char *rd = buffer;
2979
2980 // parse all options
2981 while (rd < buffer_end) {
2982 // skip leading white space from the input string
2983 while (rd < buffer_end && isspace((unsigned char) *rd)) {
2984 rd++;
2985 }
2986
2987 if (rd >= buffer_end) {
2988 break;
2989 }
2990
2991 // Remember this is where we found the head of the token.
2992 opt_hd = wrt;
2993
2994 // Tokens are strings of non white space characters separated
2995 // by one or more white spaces.
2996 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
2997 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2998 int quote = *rd; // matching quote to look for
2999 rd++; // don't copy open quote
3000 while (rd < buffer_end && *rd != quote) {
3001 // include everything (even spaces)
3002 // up until the close quote
3003 *wrt++ = *rd++; // copy to option string
3004 }
3005
3006 if (rd < buffer_end) {
3007 rd++; // don't copy close quote
3008 } else {
3009 // did not see closing quote
3010 jio_fprintf(defaultStream::error_stream(),
3011 "Unmatched quote in %s\n", name);
3012 return JNI_ERR;
3013 }
3014 } else {
3015 *wrt++ = *rd++; // copy to option string
3016 }
3017 }
3018
3019 // steal a white space character and set it to null
3020 *wrt++ = '\0';
3021 // We now have a complete token
3022
3023 JavaVMOption option;
3024 option.optionString = opt_hd;
3025 option.extraInfo = nullptr;
3026
3027 options.append(option); // Fill in option
3028
3029 rd++; // Advance to next character
3030 }
3031
3032 // Fill out JavaVMInitArgs structure.
3033 return vm_args->set_args(&options);
3034 }
3035
3036 #ifndef PRODUCT
3037 // Determine whether LogVMOutput should be implicitly turned on.
3038 static bool use_vm_log() {
3039 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3040 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3041 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3042 PrintAssembly || TraceDeoptimization ||
3043 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3044 return true;
3045 }
3046
3047 #ifdef COMPILER1
3048 if (PrintC1Statistics) {
3049 return true;
3050 }
3051 #endif // COMPILER1
3052
3053 #ifdef COMPILER2
3054 if (PrintOptoAssembly || PrintOptoStatistics) {
3055 return true;
3056 }
3057 #endif // COMPILER2
3058
3059 return false;
3060 }
3061
3062 #endif // PRODUCT
3063
3064 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3065 for (int index = 0; index < args->nOptions; index++) {
3066 const JavaVMOption* option = args->options + index;
3067 const char* tail;
3068 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3069 return true;
3070 }
3071 }
3072 return false;
3073 }
3074
3075 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3076 const char* vm_options_file,
3077 const int vm_options_file_pos,
3078 ScopedVMInitArgs* vm_options_file_args,
3079 ScopedVMInitArgs* args_out) {
3080 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3081 if (code != JNI_OK) {
3082 return code;
3083 }
3084
3085 if (vm_options_file_args->get()->nOptions < 1) {
3086 return JNI_OK;
3087 }
3088
3089 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3090 jio_fprintf(defaultStream::error_stream(),
3091 "A VM options file may not refer to a VM options file. "
3092 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3093 "options file '%s' in options container '%s' is an error.\n",
3094 vm_options_file_args->vm_options_file_arg(),
3095 vm_options_file_args->container_name());
3096 return JNI_EINVAL;
3097 }
3098
3099 return args_out->insert(args, vm_options_file_args->get(),
3100 vm_options_file_pos);
3101 }
3102
3103 // Expand -XX:VMOptionsFile found in args_in as needed.
3104 // mod_args and args_out parameters may return values as needed.
3105 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3106 ScopedVMInitArgs* mod_args,
3107 JavaVMInitArgs** args_out) {
3108 jint code = match_special_option_and_act(args_in, mod_args);
3109 if (code != JNI_OK) {
3110 return code;
3111 }
3112
3113 if (mod_args->is_set()) {
3114 // args_in contains -XX:VMOptionsFile and mod_args contains the
3115 // original options from args_in along with the options expanded
3116 // from the VMOptionsFile. Return a short-hand to the caller.
3117 *args_out = mod_args->get();
3118 } else {
3119 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3120 }
3121 return JNI_OK;
3122 }
3123
3124 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3125 ScopedVMInitArgs* args_out) {
3126 // Remaining part of option string
3127 const char* tail;
3128 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3129
3130 for (int index = 0; index < args->nOptions; index++) {
3131 const JavaVMOption* option = args->options + index;
3132 if (match_option(option, "-XX:Flags=", &tail)) {
3133 Arguments::set_jvm_flags_file(tail);
3134 continue;
3135 }
3136 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3137 if (vm_options_file_args.found_vm_options_file_arg()) {
3138 jio_fprintf(defaultStream::error_stream(),
3139 "The option '%s' is already specified in the options "
3140 "container '%s' so the specification of '%s' in the "
3141 "same options container is an error.\n",
3142 vm_options_file_args.vm_options_file_arg(),
3143 vm_options_file_args.container_name(),
3144 option->optionString);
3145 return JNI_EINVAL;
3146 }
3147 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3148 // If there's a VMOptionsFile, parse that
3149 jint code = insert_vm_options_file(args, tail, index,
3150 &vm_options_file_args, args_out);
3151 if (code != JNI_OK) {
3152 return code;
3153 }
3154 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3155 if (args_out->is_set()) {
3156 // The VMOptions file inserted some options so switch 'args'
3157 // to the new set of options, and continue processing which
3158 // preserves "last option wins" semantics.
3159 args = args_out->get();
3160 // The first option from the VMOptionsFile replaces the
3161 // current option. So we back track to process the
3162 // replacement option.
3163 index--;
3164 }
3165 continue;
3166 }
3167 if (match_option(option, "-XX:+PrintVMOptions")) {
3168 PrintVMOptions = true;
3169 continue;
3170 }
3171 if (match_option(option, "-XX:-PrintVMOptions")) {
3172 PrintVMOptions = false;
3173 continue;
3174 }
3175 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3176 IgnoreUnrecognizedVMOptions = true;
3177 continue;
3178 }
3179 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3180 IgnoreUnrecognizedVMOptions = false;
3181 continue;
3182 }
3183 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3184 JVMFlag::printFlags(tty, false);
3185 vm_exit(0);
3186 }
3187
3188 #ifndef PRODUCT
3189 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3190 JVMFlag::printFlags(tty, true);
3191 vm_exit(0);
3192 }
3193 #endif
3194 }
3195 return JNI_OK;
3196 }
3197
3198 static void print_options(const JavaVMInitArgs *args) {
3199 const char* tail;
3200 for (int index = 0; index < args->nOptions; index++) {
3201 const JavaVMOption *option = args->options + index;
3202 if (match_option(option, "-XX:", &tail)) {
3203 logOption(tail);
3204 }
3205 }
3206 }
3207
3208 bool Arguments::handle_deprecated_print_gc_flags() {
3209 if (PrintGC) {
3210 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3211 }
3212 if (PrintGCDetails) {
3213 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3214 }
3215
3216 if (_legacyGCLogging.lastFlag == 2) {
3217 // -Xloggc was used to specify a filename
3218 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3219
3220 LogTarget(Error, logging) target;
3221 LogStream errstream(target);
3222 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3223 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3224 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3225 }
3226 return true;
3227 }
3228
3229 static void apply_debugger_ergo() {
3230 #ifdef ASSERT
3231 if (ReplayCompiles) {
3232 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3233 }
3234
3235 if (UseDebuggerErgo) {
3236 // Turn on sub-flags
3237 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3238 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3239 }
3240
3241 if (UseDebuggerErgo2) {
3242 // Debugging with limited number of CPUs
3243 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3244 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3245 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3246 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3247 }
3248 #endif // ASSERT
3249 }
3250
3251 // Parse entry point called from JNI_CreateJavaVM
3252
3253 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3254 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3255 JVMFlag::check_all_flag_declarations();
3256
3257 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3258 const char* hotspotrc = ".hotspotrc";
3259 bool settings_file_specified = false;
3260 bool needs_hotspotrc_warning = false;
3261 ScopedVMInitArgs initial_vm_options_args("");
3262 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3263 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3264 ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'");
3265
3266 // Pointers to current working set of containers
3267 JavaVMInitArgs* cur_cmd_args;
3268 JavaVMInitArgs* cur_vm_options_args;
3269 JavaVMInitArgs* cur_java_options_args;
3270 JavaVMInitArgs* cur_java_tool_options_args;
3271 JavaVMInitArgs* cur_jdk_aot_vm_options_args;
3272
3273 // Containers for modified/expanded options
3274 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3275 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3276 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3277 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3278 ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'");
3279
3280 GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args;
3281
3282 jint code =
3283 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3284 if (code != JNI_OK) {
3285 return code;
3286 }
3287
3288 // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM.
3289 // This is an undocumented feature.
3290 code = parse_java_options_environment_variable(&initial_java_options_args);
3291 if (code != JNI_OK) {
3292 return code;
3293 }
3294
3295 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3296 char *vmoptions = ClassLoader::lookup_vm_options();
3297 if (vmoptions != nullptr) {
3298 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3299 FREE_C_HEAP_ARRAY(vmoptions);
3300 if (code != JNI_OK) {
3301 return code;
3302 }
3303 }
3304
3305 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3306 &mod_java_tool_options_args,
3307 &cur_java_tool_options_args);
3308 if (code != JNI_OK) {
3309 return code;
3310 }
3311
3312 code = expand_vm_options_as_needed(initial_cmd_args,
3313 &mod_cmd_args,
3314 &cur_cmd_args);
3315 if (code != JNI_OK) {
3316 return code;
3317 }
3318
3319 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3320 &mod_java_options_args,
3321 &cur_java_options_args);
3322 if (code != JNI_OK) {
3323 return code;
3324 }
3325
3326 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3327 &mod_vm_options_args,
3328 &cur_vm_options_args);
3329 if (code != JNI_OK) {
3330 return code;
3331 }
3332
3333 const char* flags_file = Arguments::get_jvm_flags_file();
3334 settings_file_specified = (flags_file != nullptr);
3335
3336 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags.
3337 if (settings_file_specified) {
3338 if (!process_settings_file(flags_file, true,
3339 IgnoreUnrecognizedVMOptions)) {
3340 return JNI_EINVAL;
3341 }
3342 } else {
3343 #ifdef ASSERT
3344 // Parse default .hotspotrc settings file
3345 if (!process_settings_file(".hotspotrc", false,
3346 IgnoreUnrecognizedVMOptions)) {
3347 return JNI_EINVAL;
3348 }
3349 #else
3350 struct stat buf;
3351 if (os::stat(hotspotrc, &buf) == 0) {
3352 needs_hotspotrc_warning = true;
3353 }
3354 #endif
3355 }
3356
3357 // The settings in the args are applied in this order to the the JVM global flags.
3358 // For historical reasons, the order is DIFFERENT than the scanning order of
3359 // the above expand_vm_options_as_needed() calls.
3360 all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE});
3361 all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR});
3362 all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE});
3363 all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR});
3364
3365 // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all
3366 // the options that have been gathered above.
3367 code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args);
3368 if (code != JNI_OK) {
3369 return code;
3370 }
3371 code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(),
3372 &mod_jdk_aot_vm_options_args,
3373 &cur_jdk_aot_vm_options_args);
3374 if (code != JNI_OK) {
3375 return code;
3376 }
3377
3378 for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) {
3379 JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index;
3380 const char* optionString = option->optionString;
3381 if (strstr(optionString, "-XX:AOTMode=") == optionString &&
3382 strcmp(optionString, "-XX:AOTMode=create") != 0) {
3383 jio_fprintf(defaultStream::error_stream(),
3384 "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString);
3385 return JNI_ERR;
3386 }
3387 }
3388
3389 all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR});
3390
3391 if (IgnoreUnrecognizedVMOptions) {
3392 // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of
3393 // the JDK so it shouldn't have bad options.
3394 cur_cmd_args->ignoreUnrecognized = true;
3395 cur_java_tool_options_args->ignoreUnrecognized = true;
3396 cur_java_options_args->ignoreUnrecognized = true;
3397 cur_jdk_aot_vm_options_args->ignoreUnrecognized = true;
3398 }
3399
3400 if (PrintVMOptions) {
3401 // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed.
3402 print_options(cur_java_tool_options_args);
3403 print_options(cur_cmd_args);
3404 print_options(cur_java_options_args);
3405 print_options(cur_jdk_aot_vm_options_args);
3406 }
3407
3408 // Apply the settings in these args to the JVM global flags.
3409 jint result = parse_vm_init_args(&all_args);
3410
3411 if (result != JNI_OK) {
3412 return result;
3413 }
3414
3415 // Delay warning until here so that we've had a chance to process
3416 // the -XX:-PrintWarnings flag
3417 if (needs_hotspotrc_warning) {
3418 warning("%s file is present but has been ignored. "
3419 "Run with -XX:Flags=%s to load the file.",
3420 hotspotrc, hotspotrc);
3421 }
3422
3423 if (needs_module_property_warning) {
3424 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3425 " names that are reserved for internal use.");
3426 }
3427
3428 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3429 UNSUPPORTED_OPTION(UseLargePages);
3430 #endif
3431
3432 #if defined(AIX)
3433 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3434 #endif
3435
3436 #ifndef PRODUCT
3437 if (TraceBytecodesAt != 0) {
3438 TraceBytecodes = true;
3439 }
3440 #endif // PRODUCT
3441
3442 if (ScavengeRootsInCode == 0) {
3443 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3444 warning("Forcing ScavengeRootsInCode non-zero");
3445 }
3446 ScavengeRootsInCode = 1;
3447 }
3448
3449 if (!handle_deprecated_print_gc_flags()) {
3450 return JNI_EINVAL;
3451 }
3452
3453 // Set object alignment values.
3454 set_object_alignment();
3455
3456 #if !INCLUDE_CDS
3457 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3458 jio_fprintf(defaultStream::error_stream(),
3459 "Shared spaces are not supported in this VM\n");
3460 return JNI_ERR;
3461 }
3462 if (DumpLoadedClassList != nullptr) {
3463 jio_fprintf(defaultStream::error_stream(),
3464 "DumpLoadedClassList is not supported in this VM\n");
3465 return JNI_ERR;
3466 }
3467 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3468 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) {
3469 warning("Shared spaces are not supported in this VM");
3470 UseSharedSpaces = false;
3471 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3472 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot));
3473 }
3474 no_shared_spaces("CDS Disabled");
3475 #endif // INCLUDE_CDS
3476
3477 // Verify NMT arguments
3478 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3479 if (lvl == NMT_unknown) {
3480 jio_fprintf(defaultStream::error_stream(),
3481 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3482 return JNI_ERR;
3483 }
3484 if (PrintNMTStatistics && lvl == NMT_off) {
3485 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3486 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3487 }
3488
3489 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3490 if (trace_dependencies && VerifyDependencies) {
3491 warning("dependency logging results may be inflated by VerifyDependencies");
3492 }
3493
3494 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3495 log_is_enabled(Info, class, load, cause);
3496 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3497 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3498 }
3499
3500 apply_debugger_ergo();
3501
3502 // The VMThread needs to stop now and then to execute these debug options.
3503 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3504 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3505 }
3506
3507 if (log_is_enabled(Info, arguments)) {
3508 LogStream st(Log(arguments)::info());
3509 Arguments::print_on(&st);
3510 }
3511
3512 return JNI_OK;
3513 }
3514
3515 void Arguments::set_compact_headers_flags() {
3516 #ifdef _LP64
3517 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3518 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3519 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3520 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3521
3522 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3523 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3524 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3525 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3526 } else {
3527 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3528 }
3529 }
3530 #endif
3531 }
3532
3533 jint Arguments::apply_ergo() {
3534 // Set flags based on ergonomics.
3535 jint result = set_ergonomics_flags();
3536 if (result != JNI_OK) return result;
3537
3538 // Set heap size based on available physical memory
3539 GCConfig::arguments()->set_heap_size();
3540
3541 GCConfig::arguments()->initialize();
3542
3543 set_compact_headers_flags();
3544
3545 CompressedKlassPointers::pre_initialize();
3546
3547 CDSConfig::ergo_initialize();
3548
3549 // Initialize Metaspace flags and alignments
3550 Metaspace::ergo_initialize();
3551
3552 if (!StringDedup::ergo_initialize()) {
3553 return JNI_EINVAL;
3554 }
3555
3556 // Set compiler flags after GC is selected and GC specific
3557 // flags (LoopStripMiningIter) are set.
3558 CompilerConfig::ergo_initialize();
3559
3560 // Set bytecode rewriting flags
3561 set_bytecode_flags();
3562
3563 // Set flags if aggressive optimization flags are enabled
3564 jint code = set_aggressive_opts_flags();
3565 if (code != JNI_OK) {
3566 return code;
3567 }
3568
3569 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3570 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3571 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3572 warning("UseSecondarySupersTable is not supported");
3573 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3574 }
3575 if (!UseSecondarySupersTable) {
3576 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3577 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3578 }
3579
3580 #ifdef ZERO
3581 // Clear flags not supported on zero.
3582 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3583 #endif // ZERO
3584
3585 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3586 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3587 DebugNonSafepoints = true;
3588 }
3589
3590 // Treat the odd case where local verification is enabled but remote
3591 // verification is not as if both were enabled.
3592 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3593 log_info(verification)("Turning on remote verification because local verification is on");
3594 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3595 }
3596
3597 #ifndef PRODUCT
3598 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3599 if (use_vm_log()) {
3600 LogVMOutput = true;
3601 }
3602 }
3603 #endif // PRODUCT
3604
3605 if (PrintCommandLineFlags) {
3606 JVMFlag::printSetFlags(tty);
3607 }
3608
3609 #if COMPILER2_OR_JVMCI
3610 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3611 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3612 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3613 }
3614 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3615
3616 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3617 if (!EnableVectorReboxing) {
3618 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3619 } else {
3620 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3621 }
3622 }
3623 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3624 }
3625 #endif // COMPILER2_OR_JVMCI
3626
3627 #ifdef COMPILER2
3628 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
3629 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
3630 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
3631 }
3632 #endif // COMPILER2
3633
3634 if (log_is_enabled(Info, perf, class, link)) {
3635 if (!UsePerfData) {
3636 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3637 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
3638 assert(!log_is_enabled(Info, perf, class, link), "sanity");
3639 }
3640 }
3641
3642 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3643 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3644 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3645 }
3646 }
3647 return JNI_OK;
3648 }
3649
3650 jint Arguments::adjust_after_os() {
3651 if (UseNUMA) {
3652 if (UseParallelGC) {
3653 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3654 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3655 }
3656 }
3657 }
3658 return JNI_OK;
3659 }
3660
3661 int Arguments::PropertyList_count(SystemProperty* pl) {
3662 int count = 0;
3663 while(pl != nullptr) {
3664 count++;
3665 pl = pl->next();
3666 }
3667 return count;
3668 }
3669
3670 // Return the number of readable properties.
3671 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3672 int count = 0;
3673 while(pl != nullptr) {
3674 if (pl->readable()) {
3675 count++;
3676 }
3677 pl = pl->next();
3678 }
3679 return count;
3680 }
3681
3682 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3683 assert(key != nullptr, "just checking");
3684 SystemProperty* prop;
3685 for (prop = pl; prop != nullptr; prop = prop->next()) {
3686 if (strcmp(key, prop->key()) == 0) return prop->value();
3687 }
3688 return nullptr;
3689 }
3690
3691 // Return the value of the requested property provided that it is a readable property.
3692 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3693 assert(key != nullptr, "just checking");
3694 SystemProperty* prop;
3695 // Return the property value if the keys match and the property is not internal or
3696 // it's the special internal property "jdk.boot.class.path.append".
3697 for (prop = pl; prop != nullptr; prop = prop->next()) {
3698 if (strcmp(key, prop->key()) == 0) {
3699 if (!prop->internal()) {
3700 return prop->value();
3701 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3702 return prop->value();
3703 } else {
3704 // Property is internal and not jdk.boot.class.path.append so return null.
3705 return nullptr;
3706 }
3707 }
3708 }
3709 return nullptr;
3710 }
3711
3712 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3713 SystemProperty* p = *plist;
3714 if (p == nullptr) {
3715 *plist = new_p;
3716 } else {
3717 while (p->next() != nullptr) {
3718 p = p->next();
3719 }
3720 p->set_next(new_p);
3721 }
3722 }
3723
3724 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3725 bool writeable, bool internal) {
3726 if (plist == nullptr)
3727 return;
3728
3729 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3730 PropertyList_add(plist, new_p);
3731 }
3732
3733 void Arguments::PropertyList_add(SystemProperty *element) {
3734 PropertyList_add(&_system_properties, element);
3735 }
3736
3737 // This add maintains unique property key in the list.
3738 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3739 PropertyAppendable append, PropertyWriteable writeable,
3740 PropertyInternal internal) {
3741 if (plist == nullptr)
3742 return;
3743
3744 // If property key exists and is writeable, then update with new value.
3745 // Trying to update a non-writeable property is silently ignored.
3746 SystemProperty* prop;
3747 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3748 if (strcmp(k, prop->key()) == 0) {
3749 if (append == AppendProperty) {
3750 prop->append_writeable_value(v);
3751 } else {
3752 prop->set_writeable_value(v);
3753 }
3754 return;
3755 }
3756 }
3757
3758 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3759 }
3760
3761 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3762 // Returns true if all of the source pointed by src has been copied over to
3763 // the destination buffer pointed by buf. Otherwise, returns false.
3764 // Notes:
3765 // 1. If the length (buflen) of the destination buffer excluding the
3766 // null terminator character is not long enough for holding the expanded
3767 // pid characters, it also returns false instead of returning the partially
3768 // expanded one.
3769 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3770 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3771 char* buf, size_t buflen) {
3772 const char* p = src;
3773 char* b = buf;
3774 const char* src_end = &src[srclen];
3775 char* buf_end = &buf[buflen - 1];
3776
3777 while (p < src_end && b < buf_end) {
3778 if (*p == '%') {
3779 switch (*(++p)) {
3780 case '%': // "%%" ==> "%"
3781 *b++ = *p++;
3782 break;
3783 case 'p': { // "%p" ==> current process id
3784 // buf_end points to the character before the last character so
3785 // that we could write '\0' to the end of the buffer.
3786 size_t buf_sz = buf_end - b + 1;
3787 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3788
3789 // if jio_snprintf fails or the buffer is not long enough to hold
3790 // the expanded pid, returns false.
3791 if (ret < 0 || ret >= (int)buf_sz) {
3792 return false;
3793 } else {
3794 b += ret;
3795 assert(*b == '\0', "fail in copy_expand_pid");
3796 if (p == src_end && b == buf_end + 1) {
3797 // reach the end of the buffer.
3798 return true;
3799 }
3800 }
3801 p++;
3802 break;
3803 }
3804 default :
3805 *b++ = '%';
3806 }
3807 } else {
3808 *b++ = *p++;
3809 }
3810 }
3811 *b = '\0';
3812 return (p == src_end); // return false if not all of the source was copied
3813 }