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 { "InitiatingHeapOccupancyPercent", JDK_Version::jdk(27), JDK_Version::jdk(28), JDK_Version::jdk(29) },
538 { "AlwaysCompileLoopMethods", JDK_Version::jdk(27), JDK_Version::jdk(28), JDK_Version::jdk(29) },
539
540 // -------------- Obsolete Flags - sorted by expired_in --------------
541
542 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
543 #if defined(AARCH64)
544 { "NearCpool", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
545 #endif
546 #ifdef _LP64
547 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(27), JDK_Version::undefined() },
548 #endif
549
550 { "PSChunkLargeArrays", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
551 { "ParallelRefProcEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
552 { "ParallelRefProcBalancingEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
553 { "MaxRAM", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
554 { "NewSizeThreadIncrease", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
555 { "NeverActAsServerClassMachine", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
556 { "AlwaysActAsServerClassMachine", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
557 { "UseXMMForArrayCopy", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
558 { "UseNewLongLShift", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
559 { "AggressiveHeap", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
560
561 #ifdef ASSERT
562 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
563 #endif
564
565 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
566 // These entries will generate build errors. Their purpose is to test the macros.
567 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
568 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
569 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
570 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
571 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
572 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
573 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
574 #endif
575
576 { nullptr, JDK_Version(0), JDK_Version(0) }
577 };
578
579 // Flags that are aliases for other flags.
580 typedef struct {
581 const char* alias_name;
582 const char* real_name;
583 } AliasedFlag;
584
585 static AliasedFlag const aliased_jvm_flags[] = {
586 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
587 G1GC_ONLY({"InitiatingHeapOccupancyPercent" COMMA "G1IHOP" } COMMA)
588 { nullptr, nullptr}
589 };
590
591 // Return true if "v" is less than "other", where "other" may be "undefined".
592 static bool version_less_than(JDK_Version v, JDK_Version other) {
593 assert(!v.is_undefined(), "must be defined");
594 if (!other.is_undefined() && v.compare(other) >= 0) {
595 return false;
596 } else {
597 return true;
598 }
599 }
600
601 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
602 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
603 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
604 flag = special_jvm_flags[i];
605 return true;
606 }
607 }
608 return false;
609 }
610
611 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
612 assert(version != nullptr, "Must provide a version buffer");
613 SpecialFlag flag;
614 if (lookup_special_flag(flag_name, flag)) {
615 if (!flag.obsolete_in.is_undefined()) {
616 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
617 *version = flag.obsolete_in;
618 // This flag may have been marked for obsoletion in this version, but we may not
619 // have actually removed it yet. Rather than ignoring it as soon as we reach
620 // this version we allow some time for the removal to happen. So if the flag
621 // still actually exists we process it as normal, but issue an adjusted warning.
622 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
623 if (real_flag != nullptr) {
624 char version_str[256];
625 version->to_string(version_str, sizeof(version_str));
626 warning("Temporarily processing option %s; support is scheduled for removal in %s",
627 flag_name, version_str);
628 return false;
629 }
630 return true;
631 }
632 }
633 }
634 return false;
635 }
636
637 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
638 assert(version != nullptr, "Must provide a version buffer");
639 SpecialFlag flag;
640 if (lookup_special_flag(flag_name, flag)) {
641 if (!flag.deprecated_in.is_undefined()) {
642 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
643 version_less_than(JDK_Version::current(), flag.expired_in)) {
644 *version = flag.deprecated_in;
645 return 1;
646 } else {
647 return -1;
648 }
649 }
650 }
651 return 0;
652 }
653
654 const char* Arguments::real_flag_name(const char *flag_name) {
655 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
656 const AliasedFlag& flag_status = aliased_jvm_flags[i];
657 if (strcmp(flag_status.alias_name, flag_name) == 0) {
658 return flag_status.real_name;
659 }
660 }
661 return flag_name;
662 }
663
664 #ifdef ASSERT
665 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
666 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
667 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
668 return true;
669 }
670 }
671 return false;
672 }
673
674 // Verifies the correctness of the entries in the special_jvm_flags table.
675 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
676 // version being earlier than the deprecation version, then a warning is issued
677 // and verification fails - by returning false. If it is detected that the table
678 // is out of date, with respect to the current version, then ideally a warning is
679 // issued but verification does not fail. This allows the VM to operate when the
680 // version is first updated, without needing to update all the impacted flags at
681 // the same time. In practice we can't issue the warning immediately when the version
682 // is updated as it occurs for every test and some tests are not prepared to handle
683 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
684 // if the check_globals flag is true, and in addition allow a grace period and only
685 // check for stale flags when we hit build 25 (which is far enough into the 6 month
686 // release cycle that all flag updates should have been processed, whilst still
687 // leaving time to make the change before RDP2).
688 // We use a gtest to call this, passing true, so that we can detect stale flags before
689 // the end of the release cycle.
690
691 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
692
693 bool Arguments::verify_special_jvm_flags(bool check_globals) {
694 bool success = true;
695 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
696 const SpecialFlag& flag = special_jvm_flags[i];
697 if (lookup_special_flag(flag.name, i)) {
698 warning("Duplicate special flag declaration \"%s\"", flag.name);
699 success = false;
700 }
701 if (flag.deprecated_in.is_undefined() &&
702 flag.obsolete_in.is_undefined()) {
703 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
704 success = false;
705 }
706
707 if (!flag.deprecated_in.is_undefined()) {
708 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
709 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
710 success = false;
711 }
712
713 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
714 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
715 success = false;
716 }
717 }
718
719 if (!flag.obsolete_in.is_undefined()) {
720 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
721 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
722 success = false;
723 }
724
725 // if flag has become obsolete it should not have a "globals" flag defined anymore.
726 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
727 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
728 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
729 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
730 success = false;
731 }
732 }
733
734 } else if (!flag.expired_in.is_undefined()) {
735 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
736 success = false;
737 }
738
739 if (!flag.expired_in.is_undefined()) {
740 // if flag has become expired it should not have a "globals" flag defined anymore.
741 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
742 !version_less_than(JDK_Version::current(), flag.expired_in)) {
743 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
744 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
745 success = false;
746 }
747 }
748 }
749 }
750 return success;
751 }
752 #endif
753
754 bool Arguments::atojulong(const char *s, julong* result) {
755 return parse_integer(s, result);
756 }
757
758 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
759 if (size < min_size) return arg_too_small;
760 if (size > max_size) return arg_too_big;
761 return arg_in_range;
762 }
763
764 // Describe an argument out of range error
765 void Arguments::describe_range_error(ArgsRange errcode) {
766 switch(errcode) {
767 case arg_too_big:
768 jio_fprintf(defaultStream::error_stream(),
769 "The specified size exceeds the maximum "
770 "representable size.\n");
771 break;
772 case arg_too_small:
773 case arg_unreadable:
774 case arg_in_range:
775 // do nothing for now
776 break;
777 default:
778 ShouldNotReachHere();
779 }
780 }
781
782 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
783 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
784 return true;
785 } else {
786 return false;
787 }
788 }
789
790 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
791 // strtod allows leading whitespace, but our flag format does not.
792 if (*value == '\0' || isspace((unsigned char) *value)) {
793 return false;
794 }
795 char* end;
796 errno = 0;
797 double v = strtod(value, &end);
798 if ((errno != 0) || (*end != 0)) {
799 return false;
800 }
801 if (g_isnan(v) || !g_isfinite(v)) {
802 // Currently we cannot handle these special values.
803 return false;
804 }
805
806 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
807 return true;
808 }
809 return false;
810 }
811
812 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
813 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
814
815 if (flag->is_int()) {
816 int v;
817 if (parse_integer(value, &v)) {
818 result = JVMFlagAccess::set_int(flag, &v, origin);
819 }
820 } else if (flag->is_uint()) {
821 uint v;
822 if (parse_integer(value, &v)) {
823 result = JVMFlagAccess::set_uint(flag, &v, origin);
824 }
825 } else if (flag->is_intx()) {
826 intx v;
827 if (parse_integer(value, &v)) {
828 result = JVMFlagAccess::set_intx(flag, &v, origin);
829 }
830 } else if (flag->is_uintx()) {
831 uintx v;
832 if (parse_integer(value, &v)) {
833 result = JVMFlagAccess::set_uintx(flag, &v, origin);
834 }
835 } else if (flag->is_uint64_t()) {
836 uint64_t v;
837 if (parse_integer(value, &v)) {
838 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
839 }
840 } else if (flag->is_size_t()) {
841 size_t v;
842 if (parse_integer(value, &v)) {
843 result = JVMFlagAccess::set_size_t(flag, &v, origin);
844 }
845 }
846
847 return result == JVMFlag::SUCCESS;
848 }
849
850 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
851 if (value[0] == '\0') {
852 value = nullptr;
853 }
854 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
855 // Contract: JVMFlag always returns a pointer that needs freeing.
856 FREE_C_HEAP_ARRAY(value);
857 return true;
858 }
859
860 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
861 const char* old_value = "";
862 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
863 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
864 size_t new_len = strlen(new_value);
865 const char* value;
866 char* free_this_too = nullptr;
867 if (old_len == 0) {
868 value = new_value;
869 } else if (new_len == 0) {
870 value = old_value;
871 } else {
872 size_t length = old_len + 1 + new_len + 1;
873 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
874 // each new setting adds another LINE to the switch:
875 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
876 value = buf;
877 free_this_too = buf;
878 }
879 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
880 // JVMFlag always returns a pointer that needs freeing.
881 FREE_C_HEAP_ARRAY(value);
882 // JVMFlag made its own copy, so I must delete my own temp. buffer.
883 FREE_C_HEAP_ARRAY(free_this_too);
884 return true;
885 }
886
887 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
888 const char* real_name = real_flag_name(arg);
889 JDK_Version since = JDK_Version();
890 switch (is_deprecated_flag(arg, &since)) {
891 case -1: {
892 // Obsolete or expired, so don't process normally,
893 // but allow for an obsolete flag we're still
894 // temporarily allowing.
895 if (!is_obsolete_flag(arg, &since)) {
896 return real_name;
897 }
898 // Note if we're not considered obsolete then we can't be expired either
899 // as obsoletion must come first.
900 return nullptr;
901 }
902 case 0:
903 return real_name;
904 case 1: {
905 char version[256];
906 since.to_string(version, sizeof(version));
907 if (real_name != arg) {
908 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
909 arg, version, real_name);
910 } else {
911 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
912 arg, version);
913 }
914 return real_name;
915 }
916 }
917 ShouldNotReachHere();
918 return nullptr;
919 }
920
921 #define BUFLEN 255
922
923 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
924 char name_copied[BUFLEN+1];
925 if (name[name_length] != 0) {
926 if (name_length > BUFLEN) {
927 return nullptr;
928 } else {
929 strncpy(name_copied, name, name_length);
930 name_copied[name_length] = '\0';
931 name = name_copied;
932 }
933 }
934
935 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
936 if (real_name == nullptr) {
937 return nullptr;
938 }
939 JVMFlag* flag = JVMFlag::find_flag(real_name);
940 return flag;
941 }
942
943 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
944 bool is_bool = false;
945 bool bool_val = false;
946 char c = *arg;
947 if (c == '+' || c == '-') {
948 is_bool = true;
949 bool_val = (c == '+');
950 arg++;
951 }
952
953 const char* name = arg;
954 while (true) {
955 c = *arg;
956 if (isalnum(c) || (c == '_')) {
957 ++arg;
958 } else {
959 break;
960 }
961 }
962
963 size_t name_len = size_t(arg - name);
964 if (name_len == 0) {
965 return false;
966 }
967
968 JVMFlag* flag = find_jvm_flag(name, name_len);
969 if (flag == nullptr) {
970 return false;
971 }
972
973 if (is_bool) {
974 if (*arg != 0) {
975 // Error -- extra characters such as -XX:+BoolFlag=123
976 return false;
977 }
978 return set_bool_flag(flag, bool_val, origin);
979 }
980
981 if (arg[0] == '=') {
982 const char* value = arg + 1;
983 if (flag->is_ccstr()) {
984 if (flag->ccstr_accumulates()) {
985 return append_to_string_flag(flag, value, origin);
986 } else {
987 return set_string_flag(flag, value, origin);
988 }
989 } else if (flag->is_double()) {
990 return set_fp_numeric_flag(flag, value, origin);
991 } else {
992 return set_numeric_flag(flag, value, origin);
993 }
994 }
995
996 if (arg[0] == ':' && arg[1] == '=') {
997 // -XX:Foo:=xxx will reset the string flag to the given value.
998 const char* value = arg + 2;
999 return set_string_flag(flag, value, origin);
1000 }
1001
1002 return false;
1003 }
1004
1005 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1006 assert(bldarray != nullptr, "illegal argument");
1007
1008 if (arg == nullptr) {
1009 return;
1010 }
1011
1012 int new_count = *count + 1;
1013
1014 // expand the array and add arg to the last element
1015 if (*bldarray == nullptr) {
1016 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1017 } else {
1018 *bldarray = REALLOC_C_HEAP_ARRAY(*bldarray, new_count, mtArguments);
1019 }
1020 (*bldarray)[*count] = os::strdup_check_oom(arg);
1021 *count = new_count;
1022 }
1023
1024 void Arguments::build_jvm_args(const char* arg) {
1025 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1026 }
1027
1028 void Arguments::build_jvm_flags(const char* arg) {
1029 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1030 }
1031
1032 // utility function to return a string that concatenates all
1033 // strings in a given char** array
1034 const char* Arguments::build_resource_string(char** args, int count) {
1035 if (args == nullptr || count == 0) {
1036 return nullptr;
1037 }
1038 size_t length = 0;
1039 for (int i = 0; i < count; i++) {
1040 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1041 }
1042 char* s = NEW_RESOURCE_ARRAY(char, length);
1043 char* dst = s;
1044 for (int j = 0; j < count; j++) {
1045 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1046 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1047 dst += offset;
1048 length -= offset;
1049 }
1050 return (const char*) s;
1051 }
1052
1053 void Arguments::print_on(outputStream* st) {
1054 st->print_cr("VM Arguments:");
1055 if (num_jvm_flags() > 0) {
1056 st->print("jvm_flags: "); print_jvm_flags_on(st);
1057 st->cr();
1058 }
1059 if (num_jvm_args() > 0) {
1060 st->print("jvm_args: "); print_jvm_args_on(st);
1061 st->cr();
1062 }
1063 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1064 if (_java_class_path != nullptr) {
1065 char* path = _java_class_path->value();
1066 size_t len = strlen(path);
1067 st->print("java_class_path (initial): ");
1068 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1069 if (len == 0) {
1070 st->print_raw_cr("<not set>");
1071 } else {
1072 st->print_raw_cr(path, len);
1073 }
1074 }
1075 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1076 }
1077
1078 void Arguments::print_summary_on(outputStream* st) {
1079 // Print the command line. Environment variables that are helpful for
1080 // reproducing the problem are written later in the hs_err file.
1081 // flags are from setting file
1082 if (num_jvm_flags() > 0) {
1083 st->print_raw("Settings File: ");
1084 print_jvm_flags_on(st);
1085 st->cr();
1086 }
1087 // args are the command line and environment variable arguments.
1088 st->print_raw("Command Line: ");
1089 if (num_jvm_args() > 0) {
1090 print_jvm_args_on(st);
1091 }
1092 // this is the classfile and any arguments to the java program
1093 if (java_command() != nullptr) {
1094 st->print("%s", java_command());
1095 }
1096 st->cr();
1097 }
1098
1099 void Arguments::set_jvm_flags_file(const char *value) {
1100 if (_jvm_flags_file != nullptr) {
1101 os::free(_jvm_flags_file);
1102 }
1103 _jvm_flags_file = os::strdup_check_oom(value);
1104 }
1105
1106 void Arguments::print_jvm_flags_on(outputStream* st) {
1107 if (_num_jvm_flags > 0) {
1108 for (int i=0; i < _num_jvm_flags; i++) {
1109 st->print("%s ", _jvm_flags_array[i]);
1110 }
1111 }
1112 }
1113
1114 void Arguments::print_jvm_args_on(outputStream* st) {
1115 if (_num_jvm_args > 0) {
1116 for (int i=0; i < _num_jvm_args; i++) {
1117 st->print("%s ", _jvm_args_array[i]);
1118 }
1119 }
1120 }
1121
1122 bool Arguments::process_argument(const char* arg,
1123 jboolean ignore_unrecognized,
1124 JVMFlagOrigin origin) {
1125 JDK_Version since = JDK_Version();
1126
1127 if (parse_argument(arg, origin)) {
1128 return true;
1129 }
1130
1131 // Determine if the flag has '+', '-', or '=' characters.
1132 bool has_plus_minus = (*arg == '+' || *arg == '-');
1133 const char* const argname = has_plus_minus ? arg + 1 : arg;
1134
1135 size_t arg_len;
1136 const char* equal_sign = strchr(argname, '=');
1137 if (equal_sign == nullptr) {
1138 arg_len = strlen(argname);
1139 } else {
1140 arg_len = equal_sign - argname;
1141 }
1142
1143 // Only make the obsolete check for valid arguments.
1144 if (arg_len <= BUFLEN) {
1145 // Construct a string which consists only of the argument name without '+', '-', or '='.
1146 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1147 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1148 if (is_obsolete_flag(stripped_argname, &since)) {
1149 char version[256];
1150 since.to_string(version, sizeof(version));
1151 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1152 return true;
1153 }
1154 }
1155
1156 // For locked flags, report a custom error message if available.
1157 // Otherwise, report the standard unrecognized VM option.
1158 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1159 if (found_flag != nullptr) {
1160 char locked_message_buf[BUFLEN];
1161 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1162 if (strlen(locked_message_buf) != 0) {
1163 #ifdef PRODUCT
1164 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1165 if (ignore_unrecognized && mismatched) {
1166 return true;
1167 }
1168 #endif
1169 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1170 }
1171 if (found_flag->is_bool() && !has_plus_minus) {
1172 jio_fprintf(defaultStream::error_stream(),
1173 "Missing +/- setting for VM option '%s'\n", argname);
1174 } else if (!found_flag->is_bool() && has_plus_minus) {
1175 jio_fprintf(defaultStream::error_stream(),
1176 "Unexpected +/- setting in VM option '%s'\n", argname);
1177 } else {
1178 jio_fprintf(defaultStream::error_stream(),
1179 "Improperly specified VM option '%s'\n", argname);
1180 }
1181 } else {
1182 if (ignore_unrecognized) {
1183 return true;
1184 }
1185 jio_fprintf(defaultStream::error_stream(),
1186 "Unrecognized VM option '%s'\n", argname);
1187 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1188 if (fuzzy_matched != nullptr) {
1189 jio_fprintf(defaultStream::error_stream(),
1190 "Did you mean '%s%s%s'?\n",
1191 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1192 fuzzy_matched->name(),
1193 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1194 }
1195 }
1196
1197 // allow for commandline "commenting out" options like -XX:#+Verbose
1198 return arg[0] == '#';
1199 }
1200
1201 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1202 FILE* stream = os::fopen(file_name, "rb");
1203 if (stream == nullptr) {
1204 if (should_exist) {
1205 jio_fprintf(defaultStream::error_stream(),
1206 "Could not open settings file %s\n", file_name);
1207 return false;
1208 } else {
1209 return true;
1210 }
1211 }
1212
1213 char token[1024];
1214 size_t pos = 0;
1215
1216 bool in_white_space = true;
1217 bool in_comment = false;
1218 bool in_quote = false;
1219 char quote_c = 0;
1220 bool result = true;
1221
1222 int c_or_eof = getc(stream);
1223 while (c_or_eof != EOF && pos < (sizeof(token) - 1)) {
1224 // We have checked the c_or_eof for EOF. getc should only ever return the
1225 // EOF or an unsigned char converted to an int. We cast down to a char to
1226 // avoid the char to int promotions we would otherwise do in the comparisons
1227 // below (which would be incorrect if we ever compared to a non-ascii char),
1228 // and the int to char conversions we would otherwise do in the assignments.
1229 const char c = static_cast<char>(c_or_eof);
1230 if (in_white_space) {
1231 if (in_comment) {
1232 if (c == '\n') in_comment = false;
1233 } else {
1234 if (c == '#') in_comment = true;
1235 else if (!isspace((unsigned char) c)) {
1236 in_white_space = false;
1237 token[pos++] = c;
1238 }
1239 }
1240 } else {
1241 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1242 // token ends at newline, or at unquoted whitespace
1243 // this allows a way to include spaces in string-valued options
1244 token[pos] = '\0';
1245 logOption(token);
1246 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1247 build_jvm_flags(token);
1248 pos = 0;
1249 in_white_space = true;
1250 in_quote = false;
1251 } else if (!in_quote && (c == '\'' || c == '"')) {
1252 in_quote = true;
1253 quote_c = c;
1254 } else if (in_quote && (c == quote_c)) {
1255 in_quote = false;
1256 } else {
1257 token[pos++] = c;
1258 }
1259 }
1260 c_or_eof = getc(stream);
1261 }
1262 if (pos > 0) {
1263 token[pos] = '\0';
1264 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1265 build_jvm_flags(token);
1266 }
1267 fclose(stream);
1268 return result;
1269 }
1270
1271 //=============================================================================================================
1272 // Parsing of properties (-D)
1273
1274 const char* Arguments::get_property(const char* key) {
1275 return PropertyList_get_value(system_properties(), key);
1276 }
1277
1278 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1279 const char* eq = strchr(prop, '=');
1280 const char* key;
1281 const char* value = "";
1282
1283 if (eq == nullptr) {
1284 // property doesn't have a value, thus use passed string
1285 key = prop;
1286 } else {
1287 // property have a value, thus extract it and save to the
1288 // allocated string
1289 size_t key_len = eq - prop;
1290 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1291
1292 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1293 key = tmp_key;
1294
1295 value = &prop[key_len + 1];
1296 }
1297
1298 if (internal == ExternalProperty) {
1299 CDSConfig::check_incompatible_property(key, value);
1300 }
1301
1302 if (strcmp(key, "java.compiler") == 0) {
1303 // we no longer support java.compiler system property, log a warning and let it get
1304 // passed to Java, like any other system property
1305 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1306 // for applications using NONE or empty value, log a more informative message
1307 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1308 } else {
1309 warning("The java.compiler system property is obsolete and no longer supported.");
1310 }
1311 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1312 // append is true, writable is true, internal is false
1313 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1314 WriteableProperty, ExternalProperty);
1315 } else {
1316 if (strcmp(key, "sun.java.command") == 0) {
1317 char *old_java_command = _java_command;
1318 _java_command = os::strdup_check_oom(value, mtArguments);
1319 if (old_java_command != nullptr) {
1320 os::free(old_java_command);
1321 }
1322 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1323 // If this property is set on the command line then its value will be
1324 // displayed in VM error logs as the URL at which to submit such logs.
1325 // Normally the URL displayed in error logs is different from the value
1326 // of this system property, so a different property should have been
1327 // used here, but we leave this as-is in case someone depends upon it.
1328 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1329 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1330 // its value without going through the property list or making a Java call.
1331 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1332 if (old_java_vendor_url_bug != nullptr) {
1333 os::free((void *)old_java_vendor_url_bug);
1334 }
1335 }
1336
1337 // Create new property and add at the end of the list
1338 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1339 }
1340
1341 if (key != prop) {
1342 // SystemProperty copy passed value, thus free previously allocated
1343 // memory
1344 FreeHeap((void *)key);
1345 }
1346
1347 return true;
1348 }
1349
1350 //===========================================================================================================
1351 // Setting int/mixed/comp mode flags
1352
1353 void Arguments::set_mode_flags(Mode mode) {
1354 // Set up default values for all flags.
1355 // If you add a flag to any of the branches below,
1356 // add a default value for it here.
1357 _mode = mode;
1358
1359 // Ensure Agent_OnLoad has the correct initial values.
1360 // This may not be the final mode; mode may change later in onload phase.
1361 PropertyList_unique_add(&_system_properties, "java.vm.info",
1362 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1363
1364 UseInterpreter = true;
1365 UseCompiler = true;
1366 UseLoopCounter = true;
1367
1368 // Default values may be platform/compiler dependent -
1369 // use the saved values
1370 ClipInlining = Arguments::_ClipInlining;
1371 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1372 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1373 BackgroundCompilation = Arguments::_BackgroundCompilation;
1374
1375 // Change from defaults based on mode
1376 switch (mode) {
1377 default:
1378 ShouldNotReachHere();
1379 break;
1380 case _int:
1381 UseCompiler = false;
1382 UseLoopCounter = false;
1383 AlwaysCompileLoopMethods = false;
1384 UseOnStackReplacement = false;
1385 break;
1386 case _mixed:
1387 // same as default
1388 break;
1389 case _comp:
1390 UseInterpreter = false;
1391 BackgroundCompilation = false;
1392 ClipInlining = false;
1393 break;
1394 }
1395 }
1396
1397 // Conflict: required to use shared spaces (-Xshare:on), but
1398 // incompatible command line options were chosen.
1399 void Arguments::no_shared_spaces(const char* message) {
1400 if (RequireSharedSpaces) {
1401 aot_log_error(aot)("%s is incompatible with other specified options.",
1402 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1403 if (CDSConfig::new_aot_flags_used()) {
1404 vm_exit_during_initialization("Unable to use AOT cache", message);
1405 } else {
1406 vm_exit_during_initialization("Unable to use shared archive", message);
1407 }
1408 } else {
1409 if (CDSConfig::new_aot_flags_used()) {
1410 log_warning(aot)("Unable to use AOT cache: %s", message);
1411 } else {
1412 aot_log_info(aot)("Unable to use shared archive: %s", message);
1413 }
1414 UseSharedSpaces = false;
1415 }
1416 }
1417
1418 static void set_object_alignment() {
1419 // Object alignment.
1420 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1421 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1422 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1423 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1424 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1425 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1426
1427 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1428 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1429
1430 // Oop encoding heap max
1431 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1432 }
1433
1434 size_t Arguments::max_heap_for_compressed_oops() {
1435 // Avoid sign flip.
1436 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1437 // We need to fit both the null page and the heap into the memory budget, while
1438 // keeping alignment constraints of the heap. To guarantee the latter, as the
1439 // null page is located before the heap, we pad the null page to the conservative
1440 // maximum alignment that the GC may ever impose upon the heap.
1441 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1442 _conservative_max_heap_alignment);
1443
1444 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1445 NOT_LP64(ShouldNotReachHere(); return 0);
1446 }
1447
1448 void Arguments::set_use_compressed_oops() {
1449 #ifdef _LP64
1450 // MaxHeapSize is not set up properly at this point, but
1451 // the only value that can override MaxHeapSize if we are
1452 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1453 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1454
1455 if (max_heap_size <= max_heap_for_compressed_oops()) {
1456 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1457 FLAG_SET_ERGO(UseCompressedOops, true);
1458 }
1459 } else {
1460 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1461 warning("Max heap size too large for Compressed Oops");
1462 FLAG_SET_DEFAULT(UseCompressedOops, false);
1463 }
1464 }
1465 #endif // _LP64
1466 }
1467
1468 void Arguments::set_conservative_max_heap_alignment() {
1469 // The conservative maximum required alignment for the heap is the maximum of
1470 // the alignments imposed by several sources: any requirements from the heap
1471 // itself and the maximum page size we may run the VM with.
1472 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1473 _conservative_max_heap_alignment = MAX3(heap_alignment,
1474 os::vm_allocation_granularity(),
1475 os::max_page_size());
1476 assert(is_power_of_2(_conservative_max_heap_alignment), "Expected to be a power-of-2");
1477 }
1478
1479 jint Arguments::set_ergonomics_flags() {
1480 GCConfig::initialize();
1481
1482 set_conservative_max_heap_alignment();
1483
1484 #ifdef _LP64
1485 set_use_compressed_oops();
1486
1487 // Also checks that certain machines are slower with compressed oops
1488 // in vm_version initialization code.
1489 #endif // _LP64
1490
1491 return JNI_OK;
1492 }
1493
1494 // This must be called after ergonomics.
1495 void Arguments::set_bytecode_flags() {
1496 if (!RewriteBytecodes) {
1497 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1498 }
1499 }
1500
1501 // Aggressive optimization flags
1502 jint Arguments::set_aggressive_opts_flags() {
1503 #ifdef COMPILER2
1504 if (AggressiveUnboxing) {
1505 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1506 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1507 } else if (!EliminateAutoBox) {
1508 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1509 AggressiveUnboxing = false;
1510 }
1511 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1512 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1513 } else if (!DoEscapeAnalysis) {
1514 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1515 AggressiveUnboxing = false;
1516 }
1517 }
1518 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1519 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1520 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1521 }
1522 // Feed the cache size setting into the JDK
1523 char buffer[1024];
1524 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1525 if (!add_property(buffer)) {
1526 return JNI_ENOMEM;
1527 }
1528 }
1529 #endif
1530
1531 return JNI_OK;
1532 }
1533
1534 //===========================================================================================================
1535
1536 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1537 if (_sun_java_launcher != _default_java_launcher) {
1538 os::free(const_cast<char*>(_sun_java_launcher));
1539 }
1540 _sun_java_launcher = os::strdup_check_oom(launcher);
1541 }
1542
1543 bool Arguments::created_by_java_launcher() {
1544 assert(_sun_java_launcher != nullptr, "property must have value");
1545 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1546 }
1547
1548 bool Arguments::executing_unit_tests() {
1549 return _executing_unit_tests;
1550 }
1551
1552 //===========================================================================================================
1553 // Parsing of main arguments
1554
1555 static unsigned int addreads_count = 0;
1556 static unsigned int addexports_count = 0;
1557 static unsigned int addopens_count = 0;
1558 static unsigned int patch_mod_count = 0;
1559 static unsigned int enable_native_access_count = 0;
1560 static unsigned int enable_final_field_mutation = 0;
1561 static bool patch_mod_javabase = false;
1562
1563 // Check the consistency of vm_init_args
1564 bool Arguments::check_vm_args_consistency() {
1565 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1566 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
1567 return false;
1568 }
1569
1570 // Method for adding checks for flag consistency.
1571 // The intent is to warn the user of all possible conflicts,
1572 // before returning an error.
1573 // Note: Needs platform-dependent factoring.
1574 bool status = true;
1575
1576 status = CompilerConfig::check_args_consistency(status);
1577 #if INCLUDE_JVMCI
1578 if (status && EnableJVMCI) {
1579 // Add the JVMCI module if not using libjvmci or EnableJVMCI
1580 // was explicitly set on the command line or in the jimage.
1581 if ((!UseJVMCINativeLibrary || FLAG_IS_CMDLINE(EnableJVMCI) || FLAG_IS_JIMAGE_RESOURCE(EnableJVMCI)) && ClassLoader::is_module_observable("jdk.internal.vm.ci") && !_jvmci_module_added) {
1582 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1583 return false;
1584 }
1585 }
1586 }
1587 #endif
1588
1589 #if INCLUDE_JFR
1590 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1591 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1592 return false;
1593 }
1594 }
1595 #endif
1596
1597 #ifndef SUPPORT_RESERVED_STACK_AREA
1598 if (StackReservedPages != 0) {
1599 FLAG_SET_CMDLINE(StackReservedPages, 0);
1600 warning("Reserved Stack Area not supported on this platform");
1601 }
1602 #endif
1603
1604 return status;
1605 }
1606
1607 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1608 const char* option_type) {
1609 if (ignore) return false;
1610
1611 const char* spacer = " ";
1612 if (option_type == nullptr) {
1613 option_type = ++spacer; // Set both to the empty string.
1614 }
1615
1616 jio_fprintf(defaultStream::error_stream(),
1617 "Unrecognized %s%soption: %s\n", option_type, spacer,
1618 option->optionString);
1619 return true;
1620 }
1621
1622 static const char* user_assertion_options[] = {
1623 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1624 };
1625
1626 static const char* system_assertion_options[] = {
1627 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1628 };
1629
1630 bool Arguments::parse_uint(const char* value,
1631 uint* uint_arg,
1632 uint min_size) {
1633 uint n;
1634 if (!parse_integer(value, &n)) {
1635 return false;
1636 }
1637 if (n >= min_size) {
1638 *uint_arg = n;
1639 return true;
1640 } else {
1641 return false;
1642 }
1643 }
1644
1645 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1646 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1647 CDSConfig::check_internal_module_property(prop_name, prop_value);
1648 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1649 char* property = AllocateHeap(prop_len, mtArguments);
1650 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1651 if (ret < 0 || ret >= (int)prop_len) {
1652 FreeHeap(property);
1653 return false;
1654 }
1655 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1656 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1657 // that multiple occurrences of the associated flag just causes the existing property value to be
1658 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1659 // to a property after we have finished flag processing.
1660 bool added = add_property(property, WriteableProperty, internal);
1661 FreeHeap(property);
1662 return added;
1663 }
1664
1665 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1666 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1667 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1668 const unsigned int props_count_limit = 1000;
1669 const int max_digits = 3;
1670 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1671
1672 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1673 if (count < props_count_limit) {
1674 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1675 char* property = AllocateHeap(prop_len, mtArguments);
1676 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1677 if (ret < 0 || ret >= (int)prop_len) {
1678 FreeHeap(property);
1679 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1680 return false;
1681 }
1682 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1683 FreeHeap(property);
1684 return added;
1685 }
1686
1687 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1688 return false;
1689 }
1690
1691 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1692 julong* long_arg,
1693 julong min_size,
1694 julong max_size) {
1695 if (!parse_integer(s, long_arg)) return arg_unreadable;
1696 return check_memory_size(*long_arg, min_size, max_size);
1697 }
1698
1699 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) {
1700 // Save default settings for some mode flags
1701 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1702 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1703 Arguments::_ClipInlining = ClipInlining;
1704 Arguments::_BackgroundCompilation = BackgroundCompilation;
1705
1706 // Remember the default value of SharedBaseAddress.
1707 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1708
1709 // Setup flags for mixed which is the default
1710 set_mode_flags(_mixed);
1711
1712 jint result;
1713 for (int i = 0; i < all_args->length(); i++) {
1714 result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin);
1715 if (result != JNI_OK) {
1716 return result;
1717 }
1718 }
1719
1720 // Disable CDS for exploded image
1721 if (!has_jimage()) {
1722 no_shared_spaces("CDS disabled on exploded JDK");
1723 }
1724
1725 // We need to ensure processor and memory resources have been properly
1726 // configured - which may rely on arguments we just processed - before
1727 // doing the final argument processing. Any argument processing that
1728 // needs to know about processor and memory resources must occur after
1729 // this point.
1730
1731 os::init_container_support();
1732
1733 SystemMemoryBarrier::initialize();
1734
1735 // Do final processing now that all arguments have been parsed
1736 result = finalize_vm_init_args();
1737 if (result != JNI_OK) {
1738 return result;
1739 }
1740
1741 return JNI_OK;
1742 }
1743
1744 #if !INCLUDE_JVMTI || INCLUDE_CDS
1745 // Checks if name in command-line argument -agent{lib,path}:name[=options]
1746 // represents a valid JDWP agent. is_path==true denotes that we
1747 // are dealing with -agentpath (case where name is a path), otherwise with
1748 // -agentlib
1749 static bool valid_jdwp_agent(char *name, bool is_path) {
1750 char *_name;
1751 const char *_jdwp = "jdwp";
1752 size_t _len_jdwp, _len_prefix;
1753
1754 if (is_path) {
1755 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
1756 return false;
1757 }
1758
1759 _name++; // skip past last path separator
1760 _len_prefix = strlen(JNI_LIB_PREFIX);
1761
1762 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
1763 return false;
1764 }
1765
1766 _name += _len_prefix;
1767 _len_jdwp = strlen(_jdwp);
1768
1769 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
1770 _name += _len_jdwp;
1771 }
1772 else {
1773 return false;
1774 }
1775
1776 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
1777 return false;
1778 }
1779
1780 return true;
1781 }
1782
1783 if (strcmp(name, _jdwp) == 0) {
1784 return true;
1785 }
1786
1787 return false;
1788 }
1789 #endif
1790
1791 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
1792 // --patch-module=<module>=<file>(<pathsep><file>)*
1793 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
1794 // Find the equal sign between the module name and the path specification
1795 const char* module_equal = strchr(patch_mod_tail, '=');
1796 if (module_equal == nullptr) {
1797 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
1798 return JNI_ERR;
1799 } else {
1800 // Pick out the module name
1801 size_t module_len = module_equal - patch_mod_tail;
1802 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
1803 if (module_name != nullptr) {
1804 memcpy(module_name, patch_mod_tail, module_len);
1805 *(module_name + module_len) = '\0';
1806 // The path piece begins one past the module_equal sign
1807 add_patch_mod_prefix(module_name, module_equal + 1);
1808 FREE_C_HEAP_ARRAY(module_name);
1809 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
1810 return JNI_ENOMEM;
1811 }
1812 } else {
1813 return JNI_ENOMEM;
1814 }
1815 }
1816 return JNI_OK;
1817 }
1818
1819 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
1820 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
1821 // The min and max sizes match the values in globals.hpp, but scaled
1822 // with K. The values have been chosen so that alignment with page
1823 // size doesn't change the max value, which makes the conversions
1824 // back and forth between Xss value and ThreadStackSize value easier.
1825 // The values have also been chosen to fit inside a 32-bit signed type.
1826 const julong min_ThreadStackSize = 0;
1827 const julong max_ThreadStackSize = 1 * M;
1828
1829 // Make sure the above values match the range set in globals.hpp
1830 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
1831 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
1832 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
1833
1834 const julong min_size = min_ThreadStackSize * K;
1835 const julong max_size = max_ThreadStackSize * K;
1836
1837 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
1838
1839 julong size = 0;
1840 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
1841 if (errcode != arg_in_range) {
1842 bool silent = (option == nullptr); // Allow testing to silence error messages
1843 if (!silent) {
1844 jio_fprintf(defaultStream::error_stream(),
1845 "Invalid thread stack size: %s\n", option->optionString);
1846 describe_range_error(errcode);
1847 }
1848 return JNI_EINVAL;
1849 }
1850
1851 // Internally track ThreadStackSize in units of 1024 bytes.
1852 const julong size_aligned = align_up(size, K);
1853 assert(size <= size_aligned,
1854 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
1855 size, size_aligned);
1856
1857 const julong size_in_K = size_aligned / K;
1858 assert(size_in_K < (julong)max_intx,
1859 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
1860 size_in_K);
1861
1862 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
1863 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
1864 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
1865 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
1866 max_expanded, size_in_K);
1867
1868 *out_ThreadStackSize = (intx)size_in_K;
1869
1870 return JNI_OK;
1871 }
1872
1873 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
1874 // For match_option to return remaining or value part of option string
1875 const char* tail;
1876
1877 // iterate over arguments
1878 for (int index = 0; index < args->nOptions; index++) {
1879 bool is_absolute_path = false; // for -agentpath vs -agentlib
1880
1881 const JavaVMOption* option = args->options + index;
1882
1883 if (!match_option(option, "-Djava.class.path", &tail) &&
1884 !match_option(option, "-Dsun.java.command", &tail) &&
1885 !match_option(option, "-Dsun.java.launcher", &tail)) {
1886
1887 // add all jvm options to the jvm_args string. This string
1888 // is used later to set the java.vm.args PerfData string constant.
1889 // the -Djava.class.path and the -Dsun.java.command options are
1890 // omitted from jvm_args string as each have their own PerfData
1891 // string constant object.
1892 build_jvm_args(option->optionString);
1893 }
1894
1895 // -verbose:[class/module/gc/jni]
1896 if (match_option(option, "-verbose", &tail)) {
1897 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
1898 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
1899 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
1900 } else if (!strcmp(tail, ":module")) {
1901 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
1902 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
1903 } else if (!strcmp(tail, ":gc")) {
1904 if (_legacyGCLogging.lastFlag == 0) {
1905 _legacyGCLogging.lastFlag = 1;
1906 }
1907 } else if (!strcmp(tail, ":jni")) {
1908 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
1909 }
1910 // -da / -ea / -disableassertions / -enableassertions
1911 // These accept an optional class/package name separated by a colon, e.g.,
1912 // -da:java.lang.Thread.
1913 } else if (match_option(option, user_assertion_options, &tail, true)) {
1914 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1915 if (*tail == '\0') {
1916 JavaAssertions::setUserClassDefault(enable);
1917 } else {
1918 assert(*tail == ':', "bogus match by match_option()");
1919 JavaAssertions::addOption(tail + 1, enable);
1920 }
1921 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
1922 } else if (match_option(option, system_assertion_options, &tail, false)) {
1923 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1924 JavaAssertions::setSystemClassDefault(enable);
1925 // -bootclasspath:
1926 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
1927 jio_fprintf(defaultStream::output_stream(),
1928 "-Xbootclasspath is no longer a supported option.\n");
1929 return JNI_EINVAL;
1930 // -bootclasspath/a:
1931 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
1932 Arguments::append_sysclasspath(tail);
1933 // -bootclasspath/p:
1934 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
1935 jio_fprintf(defaultStream::output_stream(),
1936 "-Xbootclasspath/p is no longer a supported option.\n");
1937 return JNI_EINVAL;
1938 // -Xrun
1939 } else if (match_option(option, "-Xrun", &tail)) {
1940 if (tail != nullptr) {
1941 const char* pos = strchr(tail, ':');
1942 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
1943 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
1944 jio_snprintf(name, len + 1, "%s", tail);
1945
1946 char *options = nullptr;
1947 if(pos != nullptr) {
1948 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
1949 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
1950 }
1951 #if !INCLUDE_JVMTI
1952 if (strcmp(name, "jdwp") == 0) {
1953 jio_fprintf(defaultStream::error_stream(),
1954 "Debugging agents are not supported in this VM\n");
1955 return JNI_ERR;
1956 }
1957 #endif // !INCLUDE_JVMTI
1958 JvmtiAgentList::add_xrun(name, options, false);
1959 FREE_C_HEAP_ARRAY(name);
1960 FREE_C_HEAP_ARRAY(options);
1961 }
1962 } else if (match_option(option, "--add-reads=", &tail)) {
1963 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
1964 return JNI_ENOMEM;
1965 }
1966 } else if (match_option(option, "--add-exports=", &tail)) {
1967 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
1968 return JNI_ENOMEM;
1969 }
1970 } else if (match_option(option, "--add-opens=", &tail)) {
1971 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
1972 return JNI_ENOMEM;
1973 }
1974 } else if (match_option(option, "--add-modules=", &tail)) {
1975 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
1976 return JNI_ENOMEM;
1977 }
1978 #if INCLUDE_JVMCI
1979 if (!_jvmci_module_added) {
1980 const char *jvmci_module = strstr(tail, "jdk.internal.vm.ci");
1981 if (jvmci_module != nullptr) {
1982 char before = *(jvmci_module - 1);
1983 char after = *(jvmci_module + strlen("jdk.internal.vm.ci"));
1984 if ((before == '=' || before == ',') && (after == '\0' || after == ',')) {
1985 FLAG_SET_DEFAULT(EnableJVMCI, true);
1986 _jvmci_module_added = true;
1987 }
1988 }
1989 }
1990 #endif
1991 } else if (match_option(option, "--enable-native-access=", &tail)) {
1992 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
1993 return JNI_ENOMEM;
1994 }
1995 } else if (match_option(option, "--illegal-native-access=", &tail)) {
1996 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
1997 return JNI_ENOMEM;
1998 }
1999 } else if (match_option(option, "--limit-modules=", &tail)) {
2000 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2001 return JNI_ENOMEM;
2002 }
2003 } else if (match_option(option, "--module-path=", &tail)) {
2004 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2005 return JNI_ENOMEM;
2006 }
2007 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2008 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2009 return JNI_ENOMEM;
2010 }
2011 } else if (match_option(option, "--patch-module=", &tail)) {
2012 // --patch-module=<module>=<file>(<pathsep><file>)*
2013 int res = process_patch_mod_option(tail);
2014 if (res != JNI_OK) {
2015 return res;
2016 }
2017 } else if (match_option(option, "--enable-final-field-mutation=", &tail)) {
2018 if (!create_numbered_module_property("jdk.module.enable.final.field.mutation", tail, enable_final_field_mutation++)) {
2019 return JNI_ENOMEM;
2020 }
2021 } else if (match_option(option, "--illegal-final-field-mutation=", &tail)) {
2022 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2023 PropertyList_unique_add(&_system_properties, "jdk.module.illegal.final.field.mutation", tail,
2024 AddProperty, WriteableProperty, InternalProperty);
2025 } else {
2026 jio_fprintf(defaultStream::error_stream(),
2027 "Value specified to --illegal-final-field-mutation not recognized: '%s'\n", tail);
2028 return JNI_ERR;
2029 }
2030 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2031 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2032 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2033 AddProperty, WriteableProperty, InternalProperty);
2034 } else {
2035 jio_fprintf(defaultStream::error_stream(),
2036 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2037 return JNI_ERR;
2038 }
2039 } else if (match_option(option, "--illegal-access=", &tail)) {
2040 char version[256];
2041 JDK_Version::jdk(17).to_string(version, sizeof(version));
2042 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2043 // -agentlib and -agentpath
2044 } else if (match_option(option, "-agentlib:", &tail) ||
2045 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2046 if(tail != nullptr) {
2047 const char* pos = strchr(tail, '=');
2048 char* name;
2049 if (pos == nullptr) {
2050 name = os::strdup_check_oom(tail, mtArguments);
2051 } else {
2052 size_t len = pos - tail;
2053 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2054 memcpy(name, tail, len);
2055 name[len] = '\0';
2056 }
2057
2058 char *options = nullptr;
2059 if(pos != nullptr) {
2060 options = os::strdup_check_oom(pos + 1, mtArguments);
2061 }
2062 #if !INCLUDE_JVMTI
2063 if (valid_jdwp_agent(name, is_absolute_path)) {
2064 jio_fprintf(defaultStream::error_stream(),
2065 "Debugging agents are not supported in this VM\n");
2066 return JNI_ERR;
2067 }
2068 #elif INCLUDE_CDS
2069 if (valid_jdwp_agent(name, is_absolute_path)) {
2070 _has_jdwp_agent = true;
2071 }
2072 #endif // !INCLUDE_JVMTI
2073 JvmtiAgentList::add(name, options, is_absolute_path);
2074 os::free(name);
2075 os::free(options);
2076 }
2077 // -javaagent
2078 } else if (match_option(option, "-javaagent:", &tail)) {
2079 #if !INCLUDE_JVMTI
2080 jio_fprintf(defaultStream::error_stream(),
2081 "Instrumentation agents are not supported in this VM\n");
2082 return JNI_ERR;
2083 #else
2084 if (tail != nullptr) {
2085 size_t length = strlen(tail) + 1;
2086 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2087 jio_snprintf(options, length, "%s", tail);
2088 JvmtiAgentList::add("instrument", options, false);
2089 FREE_C_HEAP_ARRAY(options);
2090
2091 // java agents need module java.instrument
2092 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2093 return JNI_ENOMEM;
2094 }
2095 }
2096 #endif // !INCLUDE_JVMTI
2097 // --enable_preview
2098 } else if (match_option(option, "--enable-preview")) {
2099 set_enable_preview();
2100 // -Xnoclassgc
2101 } else if (match_option(option, "-Xnoclassgc")) {
2102 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2103 return JNI_EINVAL;
2104 }
2105 // -Xbatch
2106 } else if (match_option(option, "-Xbatch")) {
2107 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2108 return JNI_EINVAL;
2109 }
2110 // -Xmn for compatibility with other JVM vendors
2111 } else if (match_option(option, "-Xmn", &tail)) {
2112 julong long_initial_young_size = 0;
2113 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2114 if (errcode != arg_in_range) {
2115 jio_fprintf(defaultStream::error_stream(),
2116 "Invalid initial young generation size: %s\n", option->optionString);
2117 describe_range_error(errcode);
2118 return JNI_EINVAL;
2119 }
2120 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2121 return JNI_EINVAL;
2122 }
2123 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2124 return JNI_EINVAL;
2125 }
2126 // -Xms
2127 } else if (match_option(option, "-Xms", &tail)) {
2128 julong size = 0;
2129 // an initial heap size of 0 means automatically determine
2130 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2131 if (errcode != arg_in_range) {
2132 jio_fprintf(defaultStream::error_stream(),
2133 "Invalid initial heap size: %s\n", option->optionString);
2134 describe_range_error(errcode);
2135 return JNI_EINVAL;
2136 }
2137 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2138 return JNI_EINVAL;
2139 }
2140 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2141 return JNI_EINVAL;
2142 }
2143 // -Xmx
2144 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2145 julong long_max_heap_size = 0;
2146 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2147 if (errcode != arg_in_range) {
2148 jio_fprintf(defaultStream::error_stream(),
2149 "Invalid maximum heap size: %s\n", option->optionString);
2150 describe_range_error(errcode);
2151 return JNI_EINVAL;
2152 }
2153 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2154 return JNI_EINVAL;
2155 }
2156 // Xmaxf
2157 } else if (match_option(option, "-Xmaxf", &tail)) {
2158 char* err;
2159 double dmaxf = strtod(tail, &err);
2160 if (*err != '\0' || *tail == '\0') {
2161 jio_fprintf(defaultStream::error_stream(),
2162 "Bad max heap free ratio: %s\n",
2163 option->optionString);
2164 return JNI_EINVAL;
2165 }
2166 if (dmaxf < 0.0 || dmaxf > 1.0) {
2167 jio_fprintf(defaultStream::error_stream(),
2168 "-Xmaxf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2169 option->optionString);
2170 return JNI_EINVAL;
2171 }
2172 const uintx umaxf = (uintx)(dmaxf * 100);
2173 if (MinHeapFreeRatio > umaxf) {
2174 jio_fprintf(defaultStream::error_stream(),
2175 "-Xmaxf value (%s) must be greater than or equal to the implicit -Xminf value (%.2f)\n",
2176 tail, MinHeapFreeRatio / 100.0f);
2177 return JNI_EINVAL;
2178 }
2179 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, umaxf) != JVMFlag::SUCCESS) {
2180 return JNI_EINVAL;
2181 }
2182 // Xminf
2183 } else if (match_option(option, "-Xminf", &tail)) {
2184 char* err;
2185 double dminf = strtod(tail, &err);
2186 if (*err != '\0' || *tail == '\0') {
2187 jio_fprintf(defaultStream::error_stream(),
2188 "Bad min heap free ratio: %s\n",
2189 option->optionString);
2190 return JNI_EINVAL;
2191 }
2192 if (dminf < 0.0 || dminf > 1.0) {
2193 jio_fprintf(defaultStream::error_stream(),
2194 "-Xminf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2195 tail);
2196 return JNI_EINVAL;
2197 }
2198 const uintx uminf = (uintx)(dminf * 100);
2199 if (MaxHeapFreeRatio < uminf) {
2200 jio_fprintf(defaultStream::error_stream(),
2201 "-Xminf value (%s) must be less than or equal to the implicit -Xmaxf value (%.2f)\n",
2202 tail, MaxHeapFreeRatio / 100.0f);
2203 return JNI_EINVAL;
2204 }
2205 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, uminf) != JVMFlag::SUCCESS) {
2206 return JNI_EINVAL;
2207 }
2208 // -Xss
2209 } else if (match_option(option, "-Xss", &tail)) {
2210 intx value = 0;
2211 jint err = parse_xss(option, tail, &value);
2212 if (err != JNI_OK) {
2213 return err;
2214 }
2215 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2216 return JNI_EINVAL;
2217 }
2218 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2219 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2220 if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2221 warning("Option -Xmaxjitcodesize was deprecated in JDK 26 and will likely be removed in a future release.");
2222 }
2223 julong long_ReservedCodeCacheSize = 0;
2224
2225 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2226 if (errcode != arg_in_range) {
2227 jio_fprintf(defaultStream::error_stream(),
2228 "Invalid maximum code cache size: %s.\n", option->optionString);
2229 return JNI_EINVAL;
2230 }
2231 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2232 return JNI_EINVAL;
2233 }
2234 // -green
2235 } else if (match_option(option, "-green")) {
2236 jio_fprintf(defaultStream::error_stream(),
2237 "Green threads support not available\n");
2238 return JNI_EINVAL;
2239 // -native
2240 } else if (match_option(option, "-native")) {
2241 // HotSpot always uses native threads, ignore silently for compatibility
2242 // -Xrs
2243 } else if (match_option(option, "-Xrs")) {
2244 // Classic/EVM option, new functionality
2245 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2246 return JNI_EINVAL;
2247 }
2248 // -Xprof
2249 } else if (match_option(option, "-Xprof")) {
2250 char version[256];
2251 // Obsolete in JDK 10
2252 JDK_Version::jdk(10).to_string(version, sizeof(version));
2253 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2254 // -Xinternalversion
2255 } else if (match_option(option, "-Xinternalversion")) {
2256 jio_fprintf(defaultStream::output_stream(), "%s\n",
2257 VM_Version::internal_vm_info_string());
2258 vm_exit(0);
2259 #ifndef PRODUCT
2260 // -Xprintflags
2261 } else if (match_option(option, "-Xprintflags")) {
2262 JVMFlag::printFlags(tty, false);
2263 vm_exit(0);
2264 #endif
2265 // -D
2266 } else if (match_option(option, "-D", &tail)) {
2267 const char* value;
2268 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2269 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2270 // abort if -Djava.endorsed.dirs is set
2271 jio_fprintf(defaultStream::output_stream(),
2272 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2273 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2274 return JNI_EINVAL;
2275 }
2276 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2277 *value != '\0' && strcmp(value, "\"\"") != 0) {
2278 // abort if -Djava.ext.dirs is set
2279 jio_fprintf(defaultStream::output_stream(),
2280 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2281 return JNI_EINVAL;
2282 }
2283 // Check for module related properties. They must be set using the modules
2284 // options. For example: use "--add-modules=java.sql", not
2285 // "-Djdk.module.addmods=java.sql"
2286 if (is_internal_module_property(option->optionString + 2)) {
2287 needs_module_property_warning = true;
2288 continue;
2289 }
2290 if (!add_property(tail)) {
2291 return JNI_ENOMEM;
2292 }
2293 // Out of the box management support
2294 if (match_option(option, "-Dcom.sun.management", &tail)) {
2295 #if INCLUDE_MANAGEMENT
2296 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2297 return JNI_EINVAL;
2298 }
2299 // management agent in module jdk.management.agent
2300 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2301 return JNI_ENOMEM;
2302 }
2303 #else
2304 jio_fprintf(defaultStream::output_stream(),
2305 "-Dcom.sun.management is not supported in this VM.\n");
2306 return JNI_ERR;
2307 #endif
2308 }
2309 // -Xint
2310 } else if (match_option(option, "-Xint")) {
2311 set_mode_flags(_int);
2312 mode_flag_cmd_line = true;
2313 // -Xmixed
2314 } else if (match_option(option, "-Xmixed")) {
2315 set_mode_flags(_mixed);
2316 mode_flag_cmd_line = true;
2317 // -Xcomp
2318 } else if (match_option(option, "-Xcomp")) {
2319 // for testing the compiler; turn off all flags that inhibit compilation
2320 set_mode_flags(_comp);
2321 mode_flag_cmd_line = true;
2322 // -Xshare:dump
2323 } else if (match_option(option, "-Xshare:dump")) {
2324 CDSConfig::enable_dumping_static_archive();
2325 CDSConfig::set_old_cds_flags_used();
2326 // -Xshare:on
2327 } else if (match_option(option, "-Xshare:on")) {
2328 UseSharedSpaces = true;
2329 RequireSharedSpaces = true;
2330 CDSConfig::set_old_cds_flags_used();
2331 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2332 } else if (match_option(option, "-Xshare:auto")) {
2333 UseSharedSpaces = true;
2334 RequireSharedSpaces = false;
2335 xshare_auto_cmd_line = true;
2336 CDSConfig::set_old_cds_flags_used();
2337 // -Xshare:off
2338 } else if (match_option(option, "-Xshare:off")) {
2339 UseSharedSpaces = false;
2340 RequireSharedSpaces = false;
2341 CDSConfig::set_old_cds_flags_used();
2342 // -Xverify
2343 } else if (match_option(option, "-Xverify", &tail)) {
2344 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2345 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2346 return JNI_EINVAL;
2347 }
2348 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2349 return JNI_EINVAL;
2350 }
2351 } else if (strcmp(tail, ":remote") == 0) {
2352 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2353 return JNI_EINVAL;
2354 }
2355 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2356 return JNI_EINVAL;
2357 }
2358 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2359 return JNI_EINVAL;
2360 }
2361 // -Xdebug
2362 } else if (match_option(option, "-Xdebug")) {
2363 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2364 } else if (match_option(option, "-Xloggc:", &tail)) {
2365 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2366 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2367 _legacyGCLogging.lastFlag = 2;
2368 _legacyGCLogging.file = os::strdup_check_oom(tail);
2369 } else if (match_option(option, "-Xlog", &tail)) {
2370 bool ret = false;
2371 if (strcmp(tail, ":help") == 0) {
2372 fileStream stream(defaultStream::output_stream());
2373 LogConfiguration::print_command_line_help(&stream);
2374 vm_exit(0);
2375 } else if (strcmp(tail, ":disable") == 0) {
2376 LogConfiguration::disable_logging();
2377 ret = true;
2378 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2379 const char* async_tail = tail + strlen(":async");
2380 ret = LogConfiguration::parse_async_argument(async_tail);
2381 } else if (*tail == '\0') {
2382 ret = LogConfiguration::parse_command_line_arguments();
2383 assert(ret, "-Xlog without arguments should never fail to parse");
2384 } else if (*tail == ':') {
2385 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2386 }
2387 if (ret == false) {
2388 jio_fprintf(defaultStream::error_stream(),
2389 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2390 tail);
2391 return JNI_EINVAL;
2392 }
2393 // JNI hooks
2394 } else if (match_option(option, "-Xcheck", &tail)) {
2395 if (!strcmp(tail, ":jni")) {
2396 #if !INCLUDE_JNI_CHECK
2397 warning("JNI CHECKING is not supported in this VM");
2398 #else
2399 CheckJNICalls = true;
2400 #endif // INCLUDE_JNI_CHECK
2401 } else if (is_bad_option(option, args->ignoreUnrecognized,
2402 "check")) {
2403 return JNI_EINVAL;
2404 }
2405 } else if (match_option(option, "vfprintf")) {
2406 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2407 } else if (match_option(option, "exit")) {
2408 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2409 } else if (match_option(option, "abort")) {
2410 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2411 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2412 // and the last option wins.
2413 } else if (match_option(option, "-XX:+NeverTenure")) {
2414 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2415 return JNI_EINVAL;
2416 }
2417 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2418 return JNI_EINVAL;
2419 }
2420 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2421 return JNI_EINVAL;
2422 }
2423 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2424 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2425 return JNI_EINVAL;
2426 }
2427 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2428 return JNI_EINVAL;
2429 }
2430 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2431 return JNI_EINVAL;
2432 }
2433 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2434 uint max_tenuring_thresh = 0;
2435 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2436 jio_fprintf(defaultStream::error_stream(),
2437 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2438 return JNI_EINVAL;
2439 }
2440
2441 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2442 return JNI_EINVAL;
2443 }
2444
2445 if (MaxTenuringThreshold == 0) {
2446 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2447 return JNI_EINVAL;
2448 }
2449 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2450 return JNI_EINVAL;
2451 }
2452 } else {
2453 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2454 return JNI_EINVAL;
2455 }
2456 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2457 return JNI_EINVAL;
2458 }
2459 }
2460 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2461 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2462 return JNI_EINVAL;
2463 }
2464 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2465 return JNI_EINVAL;
2466 }
2467 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2468 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2469 return JNI_EINVAL;
2470 }
2471 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2472 return JNI_EINVAL;
2473 }
2474 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2475 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2476 return JNI_EINVAL;
2477 }
2478 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2479 return JNI_EINVAL;
2480 }
2481 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2482 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2483 return JNI_EINVAL;
2484 }
2485 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2486 return JNI_EINVAL;
2487 }
2488 } else if (match_option(option, "--finalization=", &tail)) {
2489 if (strcmp(tail, "enabled") == 0) {
2490 InstanceKlass::set_finalization_enabled(true);
2491 } else if (strcmp(tail, "disabled") == 0) {
2492 InstanceKlass::set_finalization_enabled(false);
2493 } else {
2494 jio_fprintf(defaultStream::error_stream(),
2495 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2496 tail);
2497 return JNI_EINVAL;
2498 }
2499 #if !defined(DTRACE_ENABLED)
2500 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2501 jio_fprintf(defaultStream::error_stream(),
2502 "DTraceMethodProbes flag is not applicable for this configuration\n");
2503 return JNI_EINVAL;
2504 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2505 jio_fprintf(defaultStream::error_stream(),
2506 "DTraceAllocProbes flag is not applicable for this configuration\n");
2507 return JNI_EINVAL;
2508 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2509 jio_fprintf(defaultStream::error_stream(),
2510 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2511 return JNI_EINVAL;
2512 #endif // !defined(DTRACE_ENABLED)
2513 #ifdef ASSERT
2514 } else if (match_option(option, "-XX:+FullGCALot")) {
2515 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2516 return JNI_EINVAL;
2517 }
2518 #endif
2519 #if !INCLUDE_MANAGEMENT
2520 } else if (match_option(option, "-XX:+ManagementServer")) {
2521 jio_fprintf(defaultStream::error_stream(),
2522 "ManagementServer is not supported in this VM.\n");
2523 return JNI_ERR;
2524 #endif // INCLUDE_MANAGEMENT
2525 #if INCLUDE_JVMCI
2526 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2527 if (EnableJVMCIProduct) {
2528 jio_fprintf(defaultStream::error_stream(),
2529 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2530 return JNI_EINVAL;
2531 }
2532 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2533 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2534 if (use_graal_jit) {
2535 const char* jvmci_compiler = get_property("jvmci.Compiler");
2536 if (jvmci_compiler != nullptr) {
2537 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2538 jio_fprintf(defaultStream::error_stream(),
2539 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2540 return JNI_ERR;
2541 }
2542 } else if (!add_property("jvmci.Compiler=graal")) {
2543 return JNI_ENOMEM;
2544 }
2545 }
2546
2547 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2548 if (EnableJVMCIProduct) {
2549 continue;
2550 }
2551 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2552 // Allow this flag if it has been unlocked.
2553 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2554 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2555 jio_fprintf(defaultStream::error_stream(),
2556 "Unable to enable JVMCI in product mode\n");
2557 return JNI_ERR;
2558 }
2559 }
2560 // The flag was locked so process normally to report that error
2561 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2562 return JNI_EINVAL;
2563 }
2564 #endif // INCLUDE_JVMCI
2565 #if INCLUDE_JFR
2566 } else if (match_jfr_option(&option)) {
2567 return JNI_EINVAL;
2568 #endif
2569 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2570 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2571 // already been handled
2572 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2573 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2574 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2575 return JNI_EINVAL;
2576 }
2577 }
2578 // Unknown option
2579 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2580 return JNI_ERR;
2581 }
2582 }
2583
2584 // PrintSharedArchiveAndExit will turn on
2585 // -Xshare:on
2586 // -Xlog:class+path=info
2587 if (PrintSharedArchiveAndExit) {
2588 UseSharedSpaces = true;
2589 RequireSharedSpaces = true;
2590 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2591 }
2592
2593 fix_appclasspath();
2594
2595 return JNI_OK;
2596 }
2597
2598 void Arguments::set_ext_dirs(char *value) {
2599 _ext_dirs = os::strdup_check_oom(value);
2600 }
2601
2602 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) {
2603 // For java.base check for duplicate --patch-module options being specified on the command line.
2604 // This check is only required for java.base, all other duplicate module specifications
2605 // will be checked during module system initialization. The module system initialization
2606 // will throw an ExceptionInInitializerError if this situation occurs.
2607 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2608 if (patch_mod_javabase) {
2609 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2610 } else {
2611 patch_mod_javabase = true;
2612 }
2613 }
2614
2615 // Create GrowableArray lazily, only if --patch-module has been specified
2616 if (_patch_mod_prefix == nullptr) {
2617 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2618 }
2619
2620 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2621 }
2622
2623 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2624 //
2625 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2626 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2627 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2628 // path is treated as the current directory.
2629 //
2630 // This causes problems with CDS, which requires that all directories specified in the classpath
2631 // must be empty. In most cases, applications do NOT want to load classes from the current
2632 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2633 // scripts compatible with CDS.
2634 void Arguments::fix_appclasspath() {
2635 if (IgnoreEmptyClassPaths) {
2636 const char separator = *os::path_separator();
2637 const char* src = _java_class_path->value();
2638
2639 // skip over all the leading empty paths
2640 while (*src == separator) {
2641 src ++;
2642 }
2643
2644 char* copy = os::strdup_check_oom(src, mtArguments);
2645
2646 // trim all trailing empty paths
2647 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2648 *tail = '\0';
2649 }
2650
2651 char from[3] = {separator, separator, '\0'};
2652 char to [2] = {separator, '\0'};
2653 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2654 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2655 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2656 }
2657
2658 _java_class_path->set_writeable_value(copy);
2659 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2660 }
2661 }
2662
2663 jint Arguments::finalize_vm_init_args() {
2664 // check if the default lib/endorsed directory exists; if so, error
2665 char path[JVM_MAXPATHLEN];
2666 const char* fileSep = os::file_separator();
2667 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2668
2669 DIR* dir = os::opendir(path);
2670 if (dir != nullptr) {
2671 jio_fprintf(defaultStream::output_stream(),
2672 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2673 "in modular form will be supported via the concept of upgradeable modules.\n");
2674 os::closedir(dir);
2675 return JNI_ERR;
2676 }
2677
2678 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2679 dir = os::opendir(path);
2680 if (dir != nullptr) {
2681 jio_fprintf(defaultStream::output_stream(),
2682 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2683 "Use -classpath instead.\n.");
2684 os::closedir(dir);
2685 return JNI_ERR;
2686 }
2687
2688 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2689 // but like -Xint, leave compilation thresholds unaffected.
2690 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2691 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2692 set_mode_flags(_int);
2693 }
2694
2695 #ifdef ZERO
2696 // Zero always runs in interpreted mode
2697 set_mode_flags(_int);
2698 #endif
2699
2700 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2701 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2702 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2703 }
2704
2705 #if !COMPILER2_OR_JVMCI
2706 // Don't degrade server performance for footprint
2707 if (FLAG_IS_DEFAULT(UseLargePages) &&
2708 MaxHeapSize < LargePageHeapSizeThreshold) {
2709 // No need for large granularity pages w/small heaps.
2710 // Note that large pages are enabled/disabled for both the
2711 // Java heap and the code cache.
2712 FLAG_SET_DEFAULT(UseLargePages, false);
2713 }
2714
2715 UNSUPPORTED_OPTION(ProfileInterpreter);
2716 #endif
2717
2718 // Parse the CompilationMode flag
2719 if (!CompilationModeFlag::initialize()) {
2720 return JNI_ERR;
2721 }
2722
2723 // Called after ClassLoader::lookup_vm_options() but before class loading begins.
2724 // TODO: Obtain and pass correct preview mode flag value here.
2725 ClassLoader::set_preview_mode(false);
2726
2727 if (!check_vm_args_consistency()) {
2728 return JNI_ERR;
2729 }
2730
2731
2732 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2733 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2734 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2735
2736 return JNI_OK;
2737 }
2738
2739 // Helper class for controlling the lifetime of JavaVMInitArgs
2740 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2741 // deleted on the destruction of the ScopedVMInitArgs object.
2742 class ScopedVMInitArgs : public StackObj {
2743 private:
2744 JavaVMInitArgs _args;
2745 char* _container_name;
2746 bool _is_set;
2747 char* _vm_options_file_arg;
2748
2749 public:
2750 ScopedVMInitArgs(const char *container_name) {
2751 _args.version = JNI_VERSION_1_2;
2752 _args.nOptions = 0;
2753 _args.options = nullptr;
2754 _args.ignoreUnrecognized = false;
2755 _container_name = (char *)container_name;
2756 _is_set = false;
2757 _vm_options_file_arg = nullptr;
2758 }
2759
2760 // Populates the JavaVMInitArgs object represented by this
2761 // ScopedVMInitArgs object with the arguments in options. The
2762 // allocated memory is deleted by the destructor. If this method
2763 // returns anything other than JNI_OK, then this object is in a
2764 // partially constructed state, and should be abandoned.
2765 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
2766 _is_set = true;
2767 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
2768 JavaVMOption, options->length(), mtArguments);
2769 if (options_arr == nullptr) {
2770 return JNI_ENOMEM;
2771 }
2772 _args.options = options_arr;
2773
2774 for (int i = 0; i < options->length(); i++) {
2775 options_arr[i] = options->at(i);
2776 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
2777 if (options_arr[i].optionString == nullptr) {
2778 // Rely on the destructor to do cleanup.
2779 _args.nOptions = i;
2780 return JNI_ENOMEM;
2781 }
2782 }
2783
2784 _args.nOptions = options->length();
2785 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2786 return JNI_OK;
2787 }
2788
2789 JavaVMInitArgs* get() { return &_args; }
2790 char* container_name() { return _container_name; }
2791 bool is_set() { return _is_set; }
2792 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
2793 char* vm_options_file_arg() { return _vm_options_file_arg; }
2794
2795 void set_vm_options_file_arg(const char *vm_options_file_arg) {
2796 if (_vm_options_file_arg != nullptr) {
2797 os::free(_vm_options_file_arg);
2798 }
2799 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
2800 }
2801
2802 ~ScopedVMInitArgs() {
2803 if (_vm_options_file_arg != nullptr) {
2804 os::free(_vm_options_file_arg);
2805 }
2806 if (_args.options == nullptr) return;
2807 for (int i = 0; i < _args.nOptions; i++) {
2808 os::free(_args.options[i].optionString);
2809 }
2810 FREE_C_HEAP_ARRAY(_args.options);
2811 }
2812
2813 // Insert options into this option list, to replace option at
2814 // vm_options_file_pos (-XX:VMOptionsFile)
2815 jint insert(const JavaVMInitArgs* args,
2816 const JavaVMInitArgs* args_to_insert,
2817 const int vm_options_file_pos) {
2818 assert(_args.options == nullptr, "shouldn't be set yet");
2819 assert(args_to_insert->nOptions != 0, "there should be args to insert");
2820 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
2821
2822 int length = args->nOptions + args_to_insert->nOptions - 1;
2823 // Construct new option array
2824 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
2825 for (int i = 0; i < args->nOptions; i++) {
2826 if (i == vm_options_file_pos) {
2827 // insert the new options starting at the same place as the
2828 // -XX:VMOptionsFile option
2829 for (int j = 0; j < args_to_insert->nOptions; j++) {
2830 options.push(args_to_insert->options[j]);
2831 }
2832 } else {
2833 options.push(args->options[i]);
2834 }
2835 }
2836 // make into options array
2837 return set_args(&options);
2838 }
2839 };
2840
2841 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
2842 return parse_options_environment_variable("_JAVA_OPTIONS", args);
2843 }
2844
2845 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
2846 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
2847 }
2848
2849 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) {
2850 for (int index = args->nOptions - 1; index >= 0; index--) {
2851 JavaVMOption* option = args->options + index;
2852 if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) {
2853 return option;
2854 }
2855 }
2856
2857 return nullptr;
2858 }
2859
2860 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args,
2861 ScopedVMInitArgs* jdk_aot_vm_options_args) {
2862 // Don't bother scanning all the args if this env variable is not set
2863 if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) {
2864 return JNI_OK;
2865 }
2866
2867 // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value
2868 // of AOTMode.
2869 JavaVMOption* option = nullptr;
2870 for (int i = all_args->length() - 1; i >= 0; i--) {
2871 if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) {
2872 break;
2873 }
2874 }
2875
2876 if (option != nullptr) {
2877 // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet,
2878 // so its value is not reflected inside the global variable AOTMode.
2879 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) {
2880 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
2881 }
2882 } else {
2883 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode,
2884 // which would have been set inside process_settings_file();
2885 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) {
2886 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
2887 }
2888 }
2889
2890 return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args);
2891 }
2892
2893 jint Arguments::parse_options_environment_variable(const char* name,
2894 ScopedVMInitArgs* vm_args) {
2895 char *buffer = ::getenv(name);
2896
2897 // Don't check this environment variable if user has special privileges
2898 // (e.g. unix su command).
2899 if (buffer == nullptr || os::have_special_privileges()) {
2900 return JNI_OK;
2901 }
2902
2903 if ((buffer = os::strdup(buffer)) == nullptr) {
2904 return JNI_ENOMEM;
2905 }
2906
2907 jio_fprintf(defaultStream::error_stream(),
2908 "Picked up %s: %s\n", name, buffer);
2909
2910 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
2911
2912 os::free(buffer);
2913 return retcode;
2914 }
2915
2916 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
2917 // read file into buffer
2918 int fd = ::open(file_name, O_RDONLY);
2919 if (fd < 0) {
2920 jio_fprintf(defaultStream::error_stream(),
2921 "Could not open options file '%s'\n",
2922 file_name);
2923 return JNI_ERR;
2924 }
2925
2926 struct stat stbuf;
2927 int retcode = os::stat(file_name, &stbuf);
2928 if (retcode != 0) {
2929 jio_fprintf(defaultStream::error_stream(),
2930 "Could not stat options file '%s'\n",
2931 file_name);
2932 ::close(fd);
2933 return JNI_ERR;
2934 }
2935
2936 if (stbuf.st_size == 0) {
2937 // tell caller there is no option data and that is ok
2938 ::close(fd);
2939 return JNI_OK;
2940 }
2941
2942 // '+ 1' for null termination even with max bytes
2943 size_t bytes_alloc = stbuf.st_size + 1;
2944
2945 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
2946 if (nullptr == buf) {
2947 jio_fprintf(defaultStream::error_stream(),
2948 "Could not allocate read buffer for options file parse\n");
2949 ::close(fd);
2950 return JNI_ENOMEM;
2951 }
2952
2953 memset(buf, 0, bytes_alloc);
2954
2955 // Fill buffer
2956 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
2957 ::close(fd);
2958 if (bytes_read < 0) {
2959 FREE_C_HEAP_ARRAY(buf);
2960 jio_fprintf(defaultStream::error_stream(),
2961 "Could not read options file '%s'\n", file_name);
2962 return JNI_ERR;
2963 }
2964
2965 if (bytes_read == 0) {
2966 // tell caller there is no option data and that is ok
2967 FREE_C_HEAP_ARRAY(buf);
2968 return JNI_OK;
2969 }
2970
2971 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
2972
2973 FREE_C_HEAP_ARRAY(buf);
2974 return retcode;
2975 }
2976
2977 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
2978 // Construct option array
2979 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
2980
2981 // some pointers to help with parsing
2982 char *buffer_end = buffer + buf_len;
2983 char *opt_hd = buffer;
2984 char *wrt = buffer;
2985 char *rd = buffer;
2986
2987 // parse all options
2988 while (rd < buffer_end) {
2989 // skip leading white space from the input string
2990 while (rd < buffer_end && isspace((unsigned char) *rd)) {
2991 rd++;
2992 }
2993
2994 if (rd >= buffer_end) {
2995 break;
2996 }
2997
2998 // Remember this is where we found the head of the token.
2999 opt_hd = wrt;
3000
3001 // Tokens are strings of non white space characters separated
3002 // by one or more white spaces.
3003 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3004 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3005 int quote = *rd; // matching quote to look for
3006 rd++; // don't copy open quote
3007 while (rd < buffer_end && *rd != quote) {
3008 // include everything (even spaces)
3009 // up until the close quote
3010 *wrt++ = *rd++; // copy to option string
3011 }
3012
3013 if (rd < buffer_end) {
3014 rd++; // don't copy close quote
3015 } else {
3016 // did not see closing quote
3017 jio_fprintf(defaultStream::error_stream(),
3018 "Unmatched quote in %s\n", name);
3019 return JNI_ERR;
3020 }
3021 } else {
3022 *wrt++ = *rd++; // copy to option string
3023 }
3024 }
3025
3026 // steal a white space character and set it to null
3027 *wrt++ = '\0';
3028 // We now have a complete token
3029
3030 JavaVMOption option;
3031 option.optionString = opt_hd;
3032 option.extraInfo = nullptr;
3033
3034 options.append(option); // Fill in option
3035
3036 rd++; // Advance to next character
3037 }
3038
3039 // Fill out JavaVMInitArgs structure.
3040 return vm_args->set_args(&options);
3041 }
3042
3043 #ifndef PRODUCT
3044 // Determine whether LogVMOutput should be implicitly turned on.
3045 static bool use_vm_log() {
3046 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3047 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3048 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3049 PrintAssembly || TraceDeoptimization ||
3050 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3051 return true;
3052 }
3053
3054 #ifdef COMPILER1
3055 if (PrintC1Statistics) {
3056 return true;
3057 }
3058 #endif // COMPILER1
3059
3060 #ifdef COMPILER2
3061 if (PrintOptoAssembly || PrintOptoStatistics) {
3062 return true;
3063 }
3064 #endif // COMPILER2
3065
3066 return false;
3067 }
3068
3069 #endif // PRODUCT
3070
3071 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3072 for (int index = 0; index < args->nOptions; index++) {
3073 const JavaVMOption* option = args->options + index;
3074 const char* tail;
3075 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3076 return true;
3077 }
3078 }
3079 return false;
3080 }
3081
3082 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3083 const char* vm_options_file,
3084 const int vm_options_file_pos,
3085 ScopedVMInitArgs* vm_options_file_args,
3086 ScopedVMInitArgs* args_out) {
3087 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3088 if (code != JNI_OK) {
3089 return code;
3090 }
3091
3092 if (vm_options_file_args->get()->nOptions < 1) {
3093 return JNI_OK;
3094 }
3095
3096 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3097 jio_fprintf(defaultStream::error_stream(),
3098 "A VM options file may not refer to a VM options file. "
3099 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3100 "options file '%s' in options container '%s' is an error.\n",
3101 vm_options_file_args->vm_options_file_arg(),
3102 vm_options_file_args->container_name());
3103 return JNI_EINVAL;
3104 }
3105
3106 return args_out->insert(args, vm_options_file_args->get(),
3107 vm_options_file_pos);
3108 }
3109
3110 // Expand -XX:VMOptionsFile found in args_in as needed.
3111 // mod_args and args_out parameters may return values as needed.
3112 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3113 ScopedVMInitArgs* mod_args,
3114 JavaVMInitArgs** args_out) {
3115 jint code = match_special_option_and_act(args_in, mod_args);
3116 if (code != JNI_OK) {
3117 return code;
3118 }
3119
3120 if (mod_args->is_set()) {
3121 // args_in contains -XX:VMOptionsFile and mod_args contains the
3122 // original options from args_in along with the options expanded
3123 // from the VMOptionsFile. Return a short-hand to the caller.
3124 *args_out = mod_args->get();
3125 } else {
3126 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3127 }
3128 return JNI_OK;
3129 }
3130
3131 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3132 ScopedVMInitArgs* args_out) {
3133 // Remaining part of option string
3134 const char* tail;
3135 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3136
3137 for (int index = 0; index < args->nOptions; index++) {
3138 const JavaVMOption* option = args->options + index;
3139 if (match_option(option, "-XX:Flags=", &tail)) {
3140 Arguments::set_jvm_flags_file(tail);
3141 continue;
3142 }
3143 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3144 if (vm_options_file_args.found_vm_options_file_arg()) {
3145 jio_fprintf(defaultStream::error_stream(),
3146 "The option '%s' is already specified in the options "
3147 "container '%s' so the specification of '%s' in the "
3148 "same options container is an error.\n",
3149 vm_options_file_args.vm_options_file_arg(),
3150 vm_options_file_args.container_name(),
3151 option->optionString);
3152 return JNI_EINVAL;
3153 }
3154 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3155 // If there's a VMOptionsFile, parse that
3156 jint code = insert_vm_options_file(args, tail, index,
3157 &vm_options_file_args, args_out);
3158 if (code != JNI_OK) {
3159 return code;
3160 }
3161 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3162 if (args_out->is_set()) {
3163 // The VMOptions file inserted some options so switch 'args'
3164 // to the new set of options, and continue processing which
3165 // preserves "last option wins" semantics.
3166 args = args_out->get();
3167 // The first option from the VMOptionsFile replaces the
3168 // current option. So we back track to process the
3169 // replacement option.
3170 index--;
3171 }
3172 continue;
3173 }
3174 if (match_option(option, "-XX:+PrintVMOptions")) {
3175 PrintVMOptions = true;
3176 continue;
3177 }
3178 if (match_option(option, "-XX:-PrintVMOptions")) {
3179 PrintVMOptions = false;
3180 continue;
3181 }
3182 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3183 IgnoreUnrecognizedVMOptions = true;
3184 continue;
3185 }
3186 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3187 IgnoreUnrecognizedVMOptions = false;
3188 continue;
3189 }
3190 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3191 JVMFlag::printFlags(tty, false);
3192 vm_exit(0);
3193 }
3194
3195 #ifndef PRODUCT
3196 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3197 JVMFlag::printFlags(tty, true);
3198 vm_exit(0);
3199 }
3200 #endif
3201 }
3202 return JNI_OK;
3203 }
3204
3205 static void print_options(const JavaVMInitArgs *args) {
3206 const char* tail;
3207 for (int index = 0; index < args->nOptions; index++) {
3208 const JavaVMOption *option = args->options + index;
3209 if (match_option(option, "-XX:", &tail)) {
3210 logOption(tail);
3211 }
3212 }
3213 }
3214
3215 bool Arguments::handle_deprecated_print_gc_flags() {
3216 if (PrintGC) {
3217 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3218 }
3219 if (PrintGCDetails) {
3220 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3221 }
3222
3223 if (_legacyGCLogging.lastFlag == 2) {
3224 // -Xloggc was used to specify a filename
3225 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3226
3227 LogTarget(Error, logging) target;
3228 LogStream errstream(target);
3229 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3230 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3231 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3232 }
3233 return true;
3234 }
3235
3236 static void apply_debugger_ergo() {
3237 #ifdef ASSERT
3238 if (ReplayCompiles) {
3239 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3240 }
3241
3242 if (UseDebuggerErgo) {
3243 // Turn on sub-flags
3244 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3245 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3246 }
3247
3248 if (UseDebuggerErgo2) {
3249 // Debugging with limited number of CPUs
3250 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3251 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3252 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3253 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3254 }
3255 #endif // ASSERT
3256 }
3257
3258 // Parse entry point called from JNI_CreateJavaVM
3259
3260 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3261 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3262 JVMFlag::check_all_flag_declarations();
3263
3264 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3265 const char* hotspotrc = ".hotspotrc";
3266 bool settings_file_specified = false;
3267 bool needs_hotspotrc_warning = false;
3268 ScopedVMInitArgs initial_vm_options_args("");
3269 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3270 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3271 ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'");
3272
3273 // Pointers to current working set of containers
3274 JavaVMInitArgs* cur_cmd_args;
3275 JavaVMInitArgs* cur_vm_options_args;
3276 JavaVMInitArgs* cur_java_options_args;
3277 JavaVMInitArgs* cur_java_tool_options_args;
3278 JavaVMInitArgs* cur_jdk_aot_vm_options_args;
3279
3280 // Containers for modified/expanded options
3281 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3282 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3283 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3284 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3285 ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'");
3286
3287 GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args;
3288
3289 jint code =
3290 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3291 if (code != JNI_OK) {
3292 return code;
3293 }
3294
3295 // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM.
3296 // This is an undocumented feature.
3297 code = parse_java_options_environment_variable(&initial_java_options_args);
3298 if (code != JNI_OK) {
3299 return code;
3300 }
3301
3302 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3303 char *vmoptions = ClassLoader::lookup_vm_options();
3304 if (vmoptions != nullptr) {
3305 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3306 FREE_C_HEAP_ARRAY(vmoptions);
3307 if (code != JNI_OK) {
3308 return code;
3309 }
3310 }
3311
3312 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3313 &mod_java_tool_options_args,
3314 &cur_java_tool_options_args);
3315 if (code != JNI_OK) {
3316 return code;
3317 }
3318
3319 code = expand_vm_options_as_needed(initial_cmd_args,
3320 &mod_cmd_args,
3321 &cur_cmd_args);
3322 if (code != JNI_OK) {
3323 return code;
3324 }
3325
3326 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3327 &mod_java_options_args,
3328 &cur_java_options_args);
3329 if (code != JNI_OK) {
3330 return code;
3331 }
3332
3333 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3334 &mod_vm_options_args,
3335 &cur_vm_options_args);
3336 if (code != JNI_OK) {
3337 return code;
3338 }
3339
3340 const char* flags_file = Arguments::get_jvm_flags_file();
3341 settings_file_specified = (flags_file != nullptr);
3342
3343 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags.
3344 if (settings_file_specified) {
3345 if (!process_settings_file(flags_file, true,
3346 IgnoreUnrecognizedVMOptions)) {
3347 return JNI_EINVAL;
3348 }
3349 } else {
3350 #ifdef ASSERT
3351 // Parse default .hotspotrc settings file
3352 if (!process_settings_file(".hotspotrc", false,
3353 IgnoreUnrecognizedVMOptions)) {
3354 return JNI_EINVAL;
3355 }
3356 #else
3357 struct stat buf;
3358 if (os::stat(hotspotrc, &buf) == 0) {
3359 needs_hotspotrc_warning = true;
3360 }
3361 #endif
3362 }
3363
3364 // The settings in the args are applied in this order to the the JVM global flags.
3365 // For historical reasons, the order is DIFFERENT than the scanning order of
3366 // the above expand_vm_options_as_needed() calls.
3367 all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE});
3368 all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR});
3369 all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE});
3370 all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR});
3371
3372 // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all
3373 // the options that have been gathered above.
3374 code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args);
3375 if (code != JNI_OK) {
3376 return code;
3377 }
3378 code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(),
3379 &mod_jdk_aot_vm_options_args,
3380 &cur_jdk_aot_vm_options_args);
3381 if (code != JNI_OK) {
3382 return code;
3383 }
3384
3385 for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) {
3386 JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index;
3387 const char* optionString = option->optionString;
3388 if (strstr(optionString, "-XX:AOTMode=") == optionString &&
3389 strcmp(optionString, "-XX:AOTMode=create") != 0) {
3390 jio_fprintf(defaultStream::error_stream(),
3391 "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString);
3392 return JNI_ERR;
3393 }
3394 }
3395
3396 all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR});
3397
3398 if (IgnoreUnrecognizedVMOptions) {
3399 // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of
3400 // the JDK so it shouldn't have bad options.
3401 cur_cmd_args->ignoreUnrecognized = true;
3402 cur_java_tool_options_args->ignoreUnrecognized = true;
3403 cur_java_options_args->ignoreUnrecognized = true;
3404 cur_jdk_aot_vm_options_args->ignoreUnrecognized = true;
3405 }
3406
3407 if (PrintVMOptions) {
3408 // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed.
3409 print_options(cur_java_tool_options_args);
3410 print_options(cur_cmd_args);
3411 print_options(cur_java_options_args);
3412 print_options(cur_jdk_aot_vm_options_args);
3413 }
3414
3415 // Apply the settings in these args to the JVM global flags.
3416 jint result = parse_vm_init_args(&all_args);
3417
3418 if (result != JNI_OK) {
3419 return result;
3420 }
3421
3422 // Delay warning until here so that we've had a chance to process
3423 // the -XX:-PrintWarnings flag
3424 if (needs_hotspotrc_warning) {
3425 warning("%s file is present but has been ignored. "
3426 "Run with -XX:Flags=%s to load the file.",
3427 hotspotrc, hotspotrc);
3428 }
3429
3430 if (needs_module_property_warning) {
3431 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3432 " names that are reserved for internal use.");
3433 }
3434
3435 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3436 UNSUPPORTED_OPTION(UseLargePages);
3437 #endif
3438
3439 #if defined(AIX)
3440 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3441 #endif
3442
3443 #ifndef PRODUCT
3444 if (TraceBytecodesAt != 0) {
3445 TraceBytecodes = true;
3446 }
3447 #endif // PRODUCT
3448
3449 if (ScavengeRootsInCode == 0) {
3450 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3451 warning("Forcing ScavengeRootsInCode non-zero");
3452 }
3453 ScavengeRootsInCode = 1;
3454 }
3455
3456 if (!handle_deprecated_print_gc_flags()) {
3457 return JNI_EINVAL;
3458 }
3459
3460 // Set object alignment values.
3461 set_object_alignment();
3462
3463 #if !INCLUDE_CDS
3464 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3465 jio_fprintf(defaultStream::error_stream(),
3466 "Shared spaces are not supported in this VM\n");
3467 return JNI_ERR;
3468 }
3469 if (DumpLoadedClassList != nullptr) {
3470 jio_fprintf(defaultStream::error_stream(),
3471 "DumpLoadedClassList is not supported in this VM\n");
3472 return JNI_ERR;
3473 }
3474 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3475 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) {
3476 warning("Shared spaces are not supported in this VM");
3477 UseSharedSpaces = false;
3478 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3479 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot));
3480 }
3481 no_shared_spaces("CDS Disabled");
3482 #endif // INCLUDE_CDS
3483
3484 // Verify NMT arguments
3485 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3486 if (lvl == NMT_unknown) {
3487 jio_fprintf(defaultStream::error_stream(),
3488 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3489 return JNI_ERR;
3490 }
3491 if (PrintNMTStatistics && lvl == NMT_off) {
3492 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3493 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3494 }
3495
3496 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3497 if (trace_dependencies && VerifyDependencies) {
3498 warning("dependency logging results may be inflated by VerifyDependencies");
3499 }
3500
3501 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3502 log_is_enabled(Info, class, load, cause);
3503 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3504 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3505 }
3506
3507 apply_debugger_ergo();
3508
3509 // The VMThread needs to stop now and then to execute these debug options.
3510 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3511 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3512 }
3513
3514 if (log_is_enabled(Info, arguments)) {
3515 LogStream st(Log(arguments)::info());
3516 Arguments::print_on(&st);
3517 }
3518
3519 return JNI_OK;
3520 }
3521
3522 void Arguments::set_compact_headers_flags() {
3523 #ifdef _LP64
3524 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3525 if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3526 warning("-UseObjectMonitorTable is incompatible with +UseCompactObjectHeaders; ignoring -UseObjectMonitorTable");
3527 }
3528 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
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 }