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.hpp"
58 #include "runtime/globals_extension.hpp"
59 #include "runtime/java.hpp"
60 #include "runtime/os.hpp"
61 #include "runtime/safepoint.hpp"
62 #include "runtime/safepointMechanism.hpp"
63 #include "runtime/synchronizer.hpp"
64 #include "runtime/vm_version.hpp"
65 #include "services/management.hpp"
66 #include "utilities/align.hpp"
67 #include "utilities/debug.hpp"
68 #include "utilities/defaultStream.hpp"
69 #include "utilities/macros.hpp"
70 #include "utilities/parseInteger.hpp"
71 #include "utilities/powerOfTwo.hpp"
72 #include "utilities/stringUtils.hpp"
73 #include "utilities/systemMemoryBarrier.hpp"
74 #if INCLUDE_JFR
75 #include "jfr/jfr.hpp"
76 #endif
77
78 #include <string.h>
79
80 static const char _default_java_launcher[] = "generic";
81
82 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
83
84 char* Arguments::_jvm_flags_file = nullptr;
85 char** Arguments::_jvm_flags_array = nullptr;
86 int Arguments::_num_jvm_flags = 0;
87 char** Arguments::_jvm_args_array = nullptr;
88 int Arguments::_num_jvm_args = 0;
89 unsigned int Arguments::_addmods_count = 0;
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 {"ShenandoahAccelerationSamplePeriod", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
562 {"ShenandoahRateAccelerationSampleSize", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
563 {"ShenandoahMomentaryAllocationRateSpikeSampleSize", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
564 {"ShenandoahAdaptiveSampleFrequencyHz", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
565 {"ShenandoahAdaptiveSampleSizeSeconds", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
566 {"ShenandoahAdaptiveInitialSpikeThreshold",JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
567 {"ShenandoahAdaptiveDecayFactor", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
568
569 #ifdef ASSERT
570 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
571 #endif
572
573 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
574 // These entries will generate build errors. Their purpose is to test the macros.
575 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
576 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
577 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
578 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
579 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
580 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
581 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
582 #endif
583
584 { nullptr, JDK_Version(0), JDK_Version(0) }
585 };
586
587 // Flags that are aliases for other flags.
588 typedef struct {
589 const char* alias_name;
590 const char* real_name;
591 } AliasedFlag;
592
593 static AliasedFlag const aliased_jvm_flags[] = {
594 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
595 G1GC_ONLY({"InitiatingHeapOccupancyPercent" COMMA "G1IHOP" } COMMA)
596 { nullptr, nullptr}
597 };
598
599 // Return true if "v" is less than "other", where "other" may be "undefined".
600 static bool version_less_than(JDK_Version v, JDK_Version other) {
601 assert(!v.is_undefined(), "must be defined");
602 if (!other.is_undefined() && v.compare(other) >= 0) {
603 return false;
604 } else {
605 return true;
606 }
607 }
608
609 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
610 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
611 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
612 flag = special_jvm_flags[i];
613 return true;
614 }
615 }
616 return false;
617 }
618
619 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
620 assert(version != nullptr, "Must provide a version buffer");
621 SpecialFlag flag;
622 if (lookup_special_flag(flag_name, flag)) {
623 if (!flag.obsolete_in.is_undefined()) {
624 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
625 *version = flag.obsolete_in;
626 // This flag may have been marked for obsoletion in this version, but we may not
627 // have actually removed it yet. Rather than ignoring it as soon as we reach
628 // this version we allow some time for the removal to happen. So if the flag
629 // still actually exists we process it as normal, but issue an adjusted warning.
630 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
631 if (real_flag != nullptr) {
632 char version_str[256];
633 version->to_string(version_str, sizeof(version_str));
634 warning("Temporarily processing option %s; support is scheduled for removal in %s",
635 flag_name, version_str);
636 return false;
637 }
638 return true;
639 }
640 }
641 }
642 return false;
643 }
644
645 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
646 assert(version != nullptr, "Must provide a version buffer");
647 SpecialFlag flag;
648 if (lookup_special_flag(flag_name, flag)) {
649 if (!flag.deprecated_in.is_undefined()) {
650 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
651 version_less_than(JDK_Version::current(), flag.expired_in)) {
652 *version = flag.deprecated_in;
653 return 1;
654 } else {
655 return -1;
656 }
657 }
658 }
659 return 0;
660 }
661
662 const char* Arguments::real_flag_name(const char *flag_name) {
663 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
664 const AliasedFlag& flag_status = aliased_jvm_flags[i];
665 if (strcmp(flag_status.alias_name, flag_name) == 0) {
666 return flag_status.real_name;
667 }
668 }
669 return flag_name;
670 }
671
672 #ifdef ASSERT
673 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
674 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
675 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
676 return true;
677 }
678 }
679 return false;
680 }
681
682 // Verifies the correctness of the entries in the special_jvm_flags table.
683 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
684 // version being earlier than the deprecation version, then a warning is issued
685 // and verification fails - by returning false. If it is detected that the table
686 // is out of date, with respect to the current version, then ideally a warning is
687 // issued but verification does not fail. This allows the VM to operate when the
688 // version is first updated, without needing to update all the impacted flags at
689 // the same time. In practice we can't issue the warning immediately when the version
690 // is updated as it occurs for every test and some tests are not prepared to handle
691 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
692 // if the check_globals flag is true, and in addition allow a grace period and only
693 // check for stale flags when we hit build 25 (which is far enough into the 6 month
694 // release cycle that all flag updates should have been processed, whilst still
695 // leaving time to make the change before RDP2).
696 // We use a gtest to call this, passing true, so that we can detect stale flags before
697 // the end of the release cycle.
698
699 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
700
701 bool Arguments::verify_special_jvm_flags(bool check_globals) {
702 bool success = true;
703 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
704 const SpecialFlag& flag = special_jvm_flags[i];
705 if (lookup_special_flag(flag.name, i)) {
706 warning("Duplicate special flag declaration \"%s\"", flag.name);
707 success = false;
708 }
709 if (flag.deprecated_in.is_undefined() &&
710 flag.obsolete_in.is_undefined()) {
711 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
712 success = false;
713 }
714
715 if (!flag.deprecated_in.is_undefined()) {
716 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
717 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
718 success = false;
719 }
720
721 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
722 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
723 success = false;
724 }
725 }
726
727 if (!flag.obsolete_in.is_undefined()) {
728 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
729 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
730 success = false;
731 }
732
733 // if flag has become obsolete it should not have a "globals" flag defined anymore.
734 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
735 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
736 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
737 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
738 success = false;
739 }
740 }
741
742 } else if (!flag.expired_in.is_undefined()) {
743 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
744 success = false;
745 }
746
747 if (!flag.expired_in.is_undefined()) {
748 // if flag has become expired it should not have a "globals" flag defined anymore.
749 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
750 !version_less_than(JDK_Version::current(), flag.expired_in)) {
751 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
752 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
753 success = false;
754 }
755 }
756 }
757 }
758 return success;
759 }
760 #endif
761
762 bool Arguments::atojulong(const char *s, julong* result) {
763 return parse_integer(s, result);
764 }
765
766 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
767 if (size < min_size) return arg_too_small;
768 if (size > max_size) return arg_too_big;
769 return arg_in_range;
770 }
771
772 // Describe an argument out of range error
773 void Arguments::describe_range_error(ArgsRange errcode) {
774 switch(errcode) {
775 case arg_too_big:
776 jio_fprintf(defaultStream::error_stream(),
777 "The specified size exceeds the maximum "
778 "representable size.\n");
779 break;
780 case arg_too_small:
781 case arg_unreadable:
782 case arg_in_range:
783 // do nothing for now
784 break;
785 default:
786 ShouldNotReachHere();
787 }
788 }
789
790 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
791 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
792 return true;
793 } else {
794 return false;
795 }
796 }
797
798 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
799 // strtod allows leading whitespace, but our flag format does not.
800 if (*value == '\0' || isspace((unsigned char) *value)) {
801 return false;
802 }
803 char* end;
804 errno = 0;
805 double v = strtod(value, &end);
806 if ((errno != 0) || (*end != 0)) {
807 return false;
808 }
809 if (g_isnan(v) || !g_isfinite(v)) {
810 // Currently we cannot handle these special values.
811 return false;
812 }
813
814 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
815 return true;
816 }
817 return false;
818 }
819
820 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
821 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
822
823 if (flag->is_int()) {
824 int v;
825 if (parse_integer(value, &v)) {
826 result = JVMFlagAccess::set_int(flag, &v, origin);
827 }
828 } else if (flag->is_uint()) {
829 uint v;
830 if (parse_integer(value, &v)) {
831 result = JVMFlagAccess::set_uint(flag, &v, origin);
832 }
833 } else if (flag->is_intx()) {
834 intx v;
835 if (parse_integer(value, &v)) {
836 result = JVMFlagAccess::set_intx(flag, &v, origin);
837 }
838 } else if (flag->is_uintx()) {
839 uintx v;
840 if (parse_integer(value, &v)) {
841 result = JVMFlagAccess::set_uintx(flag, &v, origin);
842 }
843 } else if (flag->is_uint64_t()) {
844 uint64_t v;
845 if (parse_integer(value, &v)) {
846 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
847 }
848 } else if (flag->is_size_t()) {
849 size_t v;
850 if (parse_integer(value, &v)) {
851 result = JVMFlagAccess::set_size_t(flag, &v, origin);
852 }
853 }
854
855 return result == JVMFlag::SUCCESS;
856 }
857
858 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
859 if (value[0] == '\0') {
860 value = nullptr;
861 }
862 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
863 // Contract: JVMFlag always returns a pointer that needs freeing.
864 FREE_C_HEAP_ARRAY(value);
865 return true;
866 }
867
868 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
869 const char* old_value = "";
870 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
871 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
872 size_t new_len = strlen(new_value);
873 const char* value;
874 char* free_this_too = nullptr;
875 if (old_len == 0) {
876 value = new_value;
877 } else if (new_len == 0) {
878 value = old_value;
879 } else {
880 size_t length = old_len + 1 + new_len + 1;
881 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
882 // each new setting adds another LINE to the switch:
883 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
884 value = buf;
885 free_this_too = buf;
886 }
887 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
888 // JVMFlag always returns a pointer that needs freeing.
889 FREE_C_HEAP_ARRAY(value);
890 // JVMFlag made its own copy, so I must delete my own temp. buffer.
891 FREE_C_HEAP_ARRAY(free_this_too);
892 return true;
893 }
894
895 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
896 const char* real_name = real_flag_name(arg);
897 JDK_Version since = JDK_Version();
898 switch (is_deprecated_flag(arg, &since)) {
899 case -1: {
900 // Obsolete or expired, so don't process normally,
901 // but allow for an obsolete flag we're still
902 // temporarily allowing.
903 if (!is_obsolete_flag(arg, &since)) {
904 return real_name;
905 }
906 // Note if we're not considered obsolete then we can't be expired either
907 // as obsoletion must come first.
908 return nullptr;
909 }
910 case 0:
911 return real_name;
912 case 1: {
913 char version[256];
914 since.to_string(version, sizeof(version));
915 if (real_name != arg) {
916 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
917 arg, version, real_name);
918 } else {
919 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
920 arg, version);
921 }
922 return real_name;
923 }
924 }
925 ShouldNotReachHere();
926 return nullptr;
927 }
928
929 #define BUFLEN 255
930
931 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
932 char name_copied[BUFLEN+1];
933 if (name[name_length] != 0) {
934 if (name_length > BUFLEN) {
935 return nullptr;
936 } else {
937 strncpy(name_copied, name, name_length);
938 name_copied[name_length] = '\0';
939 name = name_copied;
940 }
941 }
942
943 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
944 if (real_name == nullptr) {
945 return nullptr;
946 }
947 JVMFlag* flag = JVMFlag::find_flag(real_name);
948 return flag;
949 }
950
951 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
952 bool is_bool = false;
953 bool bool_val = false;
954 char c = *arg;
955 if (c == '+' || c == '-') {
956 is_bool = true;
957 bool_val = (c == '+');
958 arg++;
959 }
960
961 const char* name = arg;
962 while (true) {
963 c = *arg;
964 if (isalnum(c) || (c == '_')) {
965 ++arg;
966 } else {
967 break;
968 }
969 }
970
971 size_t name_len = size_t(arg - name);
972 if (name_len == 0) {
973 return false;
974 }
975
976 JVMFlag* flag = find_jvm_flag(name, name_len);
977 if (flag == nullptr) {
978 return false;
979 }
980
981 if (is_bool) {
982 if (*arg != 0) {
983 // Error -- extra characters such as -XX:+BoolFlag=123
984 return false;
985 }
986 return set_bool_flag(flag, bool_val, origin);
987 }
988
989 if (arg[0] == '=') {
990 const char* value = arg + 1;
991 if (flag->is_ccstr()) {
992 if (flag->ccstr_accumulates()) {
993 return append_to_string_flag(flag, value, origin);
994 } else {
995 return set_string_flag(flag, value, origin);
996 }
997 } else if (flag->is_double()) {
998 return set_fp_numeric_flag(flag, value, origin);
999 } else {
1000 return set_numeric_flag(flag, value, origin);
1001 }
1002 }
1003
1004 if (arg[0] == ':' && arg[1] == '=') {
1005 // -XX:Foo:=xxx will reset the string flag to the given value.
1006 const char* value = arg + 2;
1007 return set_string_flag(flag, value, origin);
1008 }
1009
1010 return false;
1011 }
1012
1013 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1014 assert(bldarray != nullptr, "illegal argument");
1015
1016 if (arg == nullptr) {
1017 return;
1018 }
1019
1020 int new_count = *count + 1;
1021
1022 // expand the array and add arg to the last element
1023 if (*bldarray == nullptr) {
1024 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1025 } else {
1026 *bldarray = REALLOC_C_HEAP_ARRAY(*bldarray, new_count, mtArguments);
1027 }
1028 (*bldarray)[*count] = os::strdup_check_oom(arg);
1029 *count = new_count;
1030 }
1031
1032 void Arguments::build_jvm_args(const char* arg) {
1033 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1034 }
1035
1036 void Arguments::build_jvm_flags(const char* arg) {
1037 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1038 }
1039
1040 // utility function to return a string that concatenates all
1041 // strings in a given char** array
1042 const char* Arguments::build_resource_string(char** args, int count) {
1043 if (args == nullptr || count == 0) {
1044 return nullptr;
1045 }
1046 size_t length = 0;
1047 for (int i = 0; i < count; i++) {
1048 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1049 }
1050 char* s = NEW_RESOURCE_ARRAY(char, length);
1051 char* dst = s;
1052 for (int j = 0; j < count; j++) {
1053 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1054 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1055 dst += offset;
1056 length -= offset;
1057 }
1058 return (const char*) s;
1059 }
1060
1061 void Arguments::print_on(outputStream* st) {
1062 st->print_cr("VM Arguments:");
1063 if (num_jvm_flags() > 0) {
1064 st->print("jvm_flags: "); print_jvm_flags_on(st);
1065 st->cr();
1066 }
1067 if (num_jvm_args() > 0) {
1068 st->print("jvm_args: "); print_jvm_args_on(st);
1069 st->cr();
1070 }
1071 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1072 if (_java_class_path != nullptr) {
1073 char* path = _java_class_path->value();
1074 size_t len = strlen(path);
1075 st->print("java_class_path (initial): ");
1076 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1077 if (len == 0) {
1078 st->print_raw_cr("<not set>");
1079 } else {
1080 st->print_raw_cr(path, len);
1081 }
1082 }
1083 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1084 }
1085
1086 void Arguments::print_summary_on(outputStream* st) {
1087 // Print the command line. Environment variables that are helpful for
1088 // reproducing the problem are written later in the hs_err file.
1089 // flags are from setting file
1090 if (num_jvm_flags() > 0) {
1091 st->print_raw("Settings File: ");
1092 print_jvm_flags_on(st);
1093 st->cr();
1094 }
1095 // args are the command line and environment variable arguments.
1096 st->print_raw("Command Line: ");
1097 if (num_jvm_args() > 0) {
1098 print_jvm_args_on(st);
1099 }
1100 // this is the classfile and any arguments to the java program
1101 if (java_command() != nullptr) {
1102 st->print("%s", java_command());
1103 }
1104 st->cr();
1105 }
1106
1107 void Arguments::set_jvm_flags_file(const char *value) {
1108 if (_jvm_flags_file != nullptr) {
1109 os::free(_jvm_flags_file);
1110 }
1111 _jvm_flags_file = os::strdup_check_oom(value);
1112 }
1113
1114 void Arguments::print_jvm_flags_on(outputStream* st) {
1115 if (_num_jvm_flags > 0) {
1116 for (int i=0; i < _num_jvm_flags; i++) {
1117 st->print("%s ", _jvm_flags_array[i]);
1118 }
1119 }
1120 }
1121
1122 void Arguments::print_jvm_args_on(outputStream* st) {
1123 if (_num_jvm_args > 0) {
1124 for (int i=0; i < _num_jvm_args; i++) {
1125 st->print("%s ", _jvm_args_array[i]);
1126 }
1127 }
1128 }
1129
1130 bool Arguments::process_argument(const char* arg,
1131 jboolean ignore_unrecognized,
1132 JVMFlagOrigin origin) {
1133 JDK_Version since = JDK_Version();
1134
1135 if (parse_argument(arg, origin)) {
1136 return true;
1137 }
1138
1139 // Determine if the flag has '+', '-', or '=' characters.
1140 bool has_plus_minus = (*arg == '+' || *arg == '-');
1141 const char* const argname = has_plus_minus ? arg + 1 : arg;
1142
1143 size_t arg_len;
1144 const char* equal_sign = strchr(argname, '=');
1145 if (equal_sign == nullptr) {
1146 arg_len = strlen(argname);
1147 } else {
1148 arg_len = equal_sign - argname;
1149 }
1150
1151 // Only make the obsolete check for valid arguments.
1152 if (arg_len <= BUFLEN) {
1153 // Construct a string which consists only of the argument name without '+', '-', or '='.
1154 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1155 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1156 if (is_obsolete_flag(stripped_argname, &since)) {
1157 char version[256];
1158 since.to_string(version, sizeof(version));
1159 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1160 return true;
1161 }
1162 }
1163
1164 // For locked flags, report a custom error message if available.
1165 // Otherwise, report the standard unrecognized VM option.
1166 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1167 if (found_flag != nullptr) {
1168 char locked_message_buf[BUFLEN];
1169 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1170 if (strlen(locked_message_buf) != 0) {
1171 #ifdef PRODUCT
1172 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1173 if (ignore_unrecognized && mismatched) {
1174 return true;
1175 }
1176 #endif
1177 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1178 }
1179 if (found_flag->is_bool() && !has_plus_minus) {
1180 jio_fprintf(defaultStream::error_stream(),
1181 "Missing +/- setting for VM option '%s'\n", argname);
1182 } else if (!found_flag->is_bool() && has_plus_minus) {
1183 jio_fprintf(defaultStream::error_stream(),
1184 "Unexpected +/- setting in VM option '%s'\n", argname);
1185 } else {
1186 jio_fprintf(defaultStream::error_stream(),
1187 "Improperly specified VM option '%s'\n", argname);
1188 }
1189 } else {
1190 if (ignore_unrecognized) {
1191 return true;
1192 }
1193 jio_fprintf(defaultStream::error_stream(),
1194 "Unrecognized VM option '%s'\n", argname);
1195 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1196 if (fuzzy_matched != nullptr) {
1197 jio_fprintf(defaultStream::error_stream(),
1198 "Did you mean '%s%s%s'?\n",
1199 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1200 fuzzy_matched->name(),
1201 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1202 }
1203 }
1204
1205 // allow for commandline "commenting out" options like -XX:#+Verbose
1206 return arg[0] == '#';
1207 }
1208
1209 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1210 FILE* stream = os::fopen(file_name, "rb");
1211 if (stream == nullptr) {
1212 if (should_exist) {
1213 jio_fprintf(defaultStream::error_stream(),
1214 "Could not open settings file %s\n", file_name);
1215 return false;
1216 } else {
1217 return true;
1218 }
1219 }
1220
1221 char token[1024];
1222 size_t pos = 0;
1223
1224 bool in_white_space = true;
1225 bool in_comment = false;
1226 bool in_quote = false;
1227 char quote_c = 0;
1228 bool result = true;
1229
1230 int c_or_eof = getc(stream);
1231 while (c_or_eof != EOF && pos < (sizeof(token) - 1)) {
1232 // We have checked the c_or_eof for EOF. getc should only ever return the
1233 // EOF or an unsigned char converted to an int. We cast down to a char to
1234 // avoid the char to int promotions we would otherwise do in the comparisons
1235 // below (which would be incorrect if we ever compared to a non-ascii char),
1236 // and the int to char conversions we would otherwise do in the assignments.
1237 const char c = static_cast<char>(c_or_eof);
1238 if (in_white_space) {
1239 if (in_comment) {
1240 if (c == '\n') in_comment = false;
1241 } else {
1242 if (c == '#') in_comment = true;
1243 else if (!isspace((unsigned char) c)) {
1244 in_white_space = false;
1245 token[pos++] = c;
1246 }
1247 }
1248 } else {
1249 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1250 // token ends at newline, or at unquoted whitespace
1251 // this allows a way to include spaces in string-valued options
1252 token[pos] = '\0';
1253 logOption(token);
1254 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1255 build_jvm_flags(token);
1256 pos = 0;
1257 in_white_space = true;
1258 in_quote = false;
1259 } else if (!in_quote && (c == '\'' || c == '"')) {
1260 in_quote = true;
1261 quote_c = c;
1262 } else if (in_quote && (c == quote_c)) {
1263 in_quote = false;
1264 } else {
1265 token[pos++] = c;
1266 }
1267 }
1268 c_or_eof = getc(stream);
1269 }
1270 if (pos > 0) {
1271 token[pos] = '\0';
1272 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1273 build_jvm_flags(token);
1274 }
1275 fclose(stream);
1276 return result;
1277 }
1278
1279 //=============================================================================================================
1280 // Parsing of properties (-D)
1281
1282 const char* Arguments::get_property(const char* key) {
1283 return PropertyList_get_value(system_properties(), key);
1284 }
1285
1286 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1287 const char* eq = strchr(prop, '=');
1288 const char* key;
1289 const char* value = "";
1290
1291 if (eq == nullptr) {
1292 // property doesn't have a value, thus use passed string
1293 key = prop;
1294 } else {
1295 // property have a value, thus extract it and save to the
1296 // allocated string
1297 size_t key_len = eq - prop;
1298 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1299
1300 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1301 key = tmp_key;
1302
1303 value = &prop[key_len + 1];
1304 }
1305
1306 if (internal == ExternalProperty) {
1307 CDSConfig::check_incompatible_property(key, value);
1308 }
1309
1310 if (strcmp(key, "java.compiler") == 0) {
1311 // we no longer support java.compiler system property, log a warning and let it get
1312 // passed to Java, like any other system property
1313 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1314 // for applications using NONE or empty value, log a more informative message
1315 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1316 } else {
1317 warning("The java.compiler system property is obsolete and no longer supported.");
1318 }
1319 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1320 // append is true, writable is true, internal is false
1321 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1322 WriteableProperty, ExternalProperty);
1323 } else {
1324 if (strcmp(key, "sun.java.command") == 0) {
1325 char *old_java_command = _java_command;
1326 _java_command = os::strdup_check_oom(value, mtArguments);
1327 if (old_java_command != nullptr) {
1328 os::free(old_java_command);
1329 }
1330 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1331 // If this property is set on the command line then its value will be
1332 // displayed in VM error logs as the URL at which to submit such logs.
1333 // Normally the URL displayed in error logs is different from the value
1334 // of this system property, so a different property should have been
1335 // used here, but we leave this as-is in case someone depends upon it.
1336 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1337 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1338 // its value without going through the property list or making a Java call.
1339 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1340 if (old_java_vendor_url_bug != nullptr) {
1341 os::free((void *)old_java_vendor_url_bug);
1342 }
1343 }
1344
1345 // Create new property and add at the end of the list
1346 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1347 }
1348
1349 if (key != prop) {
1350 // SystemProperty copy passed value, thus free previously allocated
1351 // memory
1352 FreeHeap((void *)key);
1353 }
1354
1355 return true;
1356 }
1357
1358 //===========================================================================================================
1359 // Setting int/mixed/comp mode flags
1360
1361 void Arguments::set_mode_flags(Mode mode) {
1362 // Set up default values for all flags.
1363 // If you add a flag to any of the branches below,
1364 // add a default value for it here.
1365 _mode = mode;
1366
1367 // Ensure Agent_OnLoad has the correct initial values.
1368 // This may not be the final mode; mode may change later in onload phase.
1369 PropertyList_unique_add(&_system_properties, "java.vm.info",
1370 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1371
1372 UseInterpreter = true;
1373 UseCompiler = true;
1374 UseLoopCounter = true;
1375
1376 // Default values may be platform/compiler dependent -
1377 // use the saved values
1378 ClipInlining = Arguments::_ClipInlining;
1379 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1380 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1381 BackgroundCompilation = Arguments::_BackgroundCompilation;
1382
1383 // Change from defaults based on mode
1384 switch (mode) {
1385 default:
1386 ShouldNotReachHere();
1387 break;
1388 case _int:
1389 UseCompiler = false;
1390 UseLoopCounter = false;
1391 AlwaysCompileLoopMethods = false;
1392 UseOnStackReplacement = false;
1393 break;
1394 case _mixed:
1395 // same as default
1396 break;
1397 case _comp:
1398 UseInterpreter = false;
1399 BackgroundCompilation = false;
1400 ClipInlining = false;
1401 break;
1402 }
1403 }
1404
1405 // Conflict: required to use shared spaces (-Xshare:on), but
1406 // incompatible command line options were chosen.
1407 void Arguments::no_shared_spaces(const char* message) {
1408 if (RequireSharedSpaces) {
1409 aot_log_error(aot)("%s is incompatible with other specified options.",
1410 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1411 if (CDSConfig::new_aot_flags_used()) {
1412 vm_exit_during_initialization("Unable to use AOT cache", message);
1413 } else {
1414 vm_exit_during_initialization("Unable to use shared archive", message);
1415 }
1416 } else {
1417 if (CDSConfig::new_aot_flags_used()) {
1418 log_warning(aot)("Unable to use AOT cache: %s", message);
1419 } else {
1420 aot_log_info(aot)("Unable to use shared archive: %s", message);
1421 }
1422 UseSharedSpaces = false;
1423 }
1424 }
1425
1426 static void set_object_alignment() {
1427 // Object alignment.
1428 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1429 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1430 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1431 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1432 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1433 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1434
1435 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1436 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1437
1438 // Oop encoding heap max
1439 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1440 }
1441
1442 size_t Arguments::max_heap_for_compressed_oops() {
1443 // Avoid sign flip.
1444 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1445 // We need to fit both the null page and the heap into the memory budget, while
1446 // keeping alignment constraints of the heap. To guarantee the latter, as the
1447 // null page is located before the heap, we pad the null page to the conservative
1448 // maximum alignment that the GC may ever impose upon the heap.
1449 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1450 _conservative_max_heap_alignment);
1451
1452 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1453 NOT_LP64(ShouldNotReachHere(); return 0);
1454 }
1455
1456 void Arguments::set_use_compressed_oops() {
1457 #ifdef _LP64
1458 // MaxHeapSize is not set up properly at this point, but
1459 // the only value that can override MaxHeapSize if we are
1460 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1461 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1462
1463 if (max_heap_size <= max_heap_for_compressed_oops()) {
1464 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1465 FLAG_SET_ERGO(UseCompressedOops, true);
1466 }
1467 } else {
1468 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1469 warning("Max heap size too large for Compressed Oops");
1470 FLAG_SET_DEFAULT(UseCompressedOops, false);
1471 }
1472 }
1473 #endif // _LP64
1474 }
1475
1476 void Arguments::set_conservative_max_heap_alignment() {
1477 // The conservative maximum required alignment for the heap is the maximum of
1478 // the alignments imposed by several sources: any requirements from the heap
1479 // itself and the maximum page size we may run the VM with.
1480 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1481 _conservative_max_heap_alignment = MAX3(heap_alignment,
1482 os::vm_allocation_granularity(),
1483 os::max_page_size());
1484 assert(is_power_of_2(_conservative_max_heap_alignment), "Expected to be a power-of-2");
1485 }
1486
1487 jint Arguments::set_ergonomics_flags() {
1488 GCConfig::initialize();
1489
1490 set_conservative_max_heap_alignment();
1491
1492 #ifdef _LP64
1493 set_use_compressed_oops();
1494
1495 // Also checks that certain machines are slower with compressed oops
1496 // in vm_version initialization code.
1497 #endif // _LP64
1498
1499 return JNI_OK;
1500 }
1501
1502 // This must be called after ergonomics.
1503 void Arguments::set_bytecode_flags() {
1504 if (!RewriteBytecodes) {
1505 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1506 }
1507 }
1508
1509 // Aggressive optimization flags
1510 jint Arguments::set_aggressive_opts_flags() {
1511 #ifdef COMPILER2
1512 if (AggressiveUnboxing) {
1513 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1514 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1515 } else if (!EliminateAutoBox) {
1516 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1517 AggressiveUnboxing = false;
1518 }
1519 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1520 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1521 } else if (!DoEscapeAnalysis) {
1522 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1523 AggressiveUnboxing = false;
1524 }
1525 }
1526 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1527 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1528 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1529 }
1530 // Feed the cache size setting into the JDK
1531 char buffer[1024];
1532 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1533 if (!add_property(buffer)) {
1534 return JNI_ENOMEM;
1535 }
1536 }
1537 #endif
1538
1539 return JNI_OK;
1540 }
1541
1542 //===========================================================================================================
1543
1544 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1545 if (_sun_java_launcher != _default_java_launcher) {
1546 os::free(const_cast<char*>(_sun_java_launcher));
1547 }
1548 _sun_java_launcher = os::strdup_check_oom(launcher);
1549 }
1550
1551 bool Arguments::created_by_java_launcher() {
1552 assert(_sun_java_launcher != nullptr, "property must have value");
1553 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1554 }
1555
1556 bool Arguments::executing_unit_tests() {
1557 return _executing_unit_tests;
1558 }
1559
1560 //===========================================================================================================
1561 // Parsing of main arguments
1562
1563 static unsigned int addreads_count = 0;
1564 static unsigned int addexports_count = 0;
1565 static unsigned int addopens_count = 0;
1566 static unsigned int patch_mod_count = 0;
1567 static unsigned int enable_native_access_count = 0;
1568 static unsigned int enable_final_field_mutation = 0;
1569 static bool patch_mod_javabase = false;
1570
1571 // Check the consistency of vm_init_args
1572 bool Arguments::check_vm_args_consistency() {
1573 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1574 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
1575 return false;
1576 }
1577
1578 // Method for adding checks for flag consistency.
1579 // The intent is to warn the user of all possible conflicts,
1580 // before returning an error.
1581 // Note: Needs platform-dependent factoring.
1582 bool status = true;
1583
1584 status = CompilerConfig::check_args_consistency(status);
1585 #if INCLUDE_JFR
1586 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1587 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1588 return false;
1589 }
1590 }
1591 #endif
1592
1593 #ifndef SUPPORT_RESERVED_STACK_AREA
1594 if (StackReservedPages != 0) {
1595 FLAG_SET_CMDLINE(StackReservedPages, 0);
1596 warning("Reserved Stack Area not supported on this platform");
1597 }
1598 #endif
1599
1600 return status;
1601 }
1602
1603 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1604 const char* option_type) {
1605 if (ignore) return false;
1606
1607 const char* spacer = " ";
1608 if (option_type == nullptr) {
1609 option_type = ++spacer; // Set both to the empty string.
1610 }
1611
1612 jio_fprintf(defaultStream::error_stream(),
1613 "Unrecognized %s%soption: %s\n", option_type, spacer,
1614 option->optionString);
1615 return true;
1616 }
1617
1618 static const char* user_assertion_options[] = {
1619 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1620 };
1621
1622 static const char* system_assertion_options[] = {
1623 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1624 };
1625
1626 bool Arguments::parse_uint(const char* value,
1627 uint* uint_arg,
1628 uint min_size) {
1629 uint n;
1630 if (!parse_integer(value, &n)) {
1631 return false;
1632 }
1633 if (n >= min_size) {
1634 *uint_arg = n;
1635 return true;
1636 } else {
1637 return false;
1638 }
1639 }
1640
1641 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1642 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1643 CDSConfig::check_internal_module_property(prop_name, prop_value);
1644 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1645 char* property = AllocateHeap(prop_len, mtArguments);
1646 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1647 if (ret < 0 || ret >= (int)prop_len) {
1648 FreeHeap(property);
1649 return false;
1650 }
1651 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1652 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1653 // that multiple occurrences of the associated flag just causes the existing property value to be
1654 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1655 // to a property after we have finished flag processing.
1656 bool added = add_property(property, WriteableProperty, internal);
1657 FreeHeap(property);
1658 return added;
1659 }
1660
1661 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1662 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1663 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1664 const unsigned int props_count_limit = 1000;
1665 const int max_digits = 3;
1666 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1667
1668 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1669 if (count < props_count_limit) {
1670 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1671 char* property = AllocateHeap(prop_len, mtArguments);
1672 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1673 if (ret < 0 || ret >= (int)prop_len) {
1674 FreeHeap(property);
1675 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1676 return false;
1677 }
1678 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1679 FreeHeap(property);
1680 return added;
1681 }
1682
1683 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1684 return false;
1685 }
1686
1687 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1688 julong* long_arg,
1689 julong min_size,
1690 julong max_size) {
1691 if (!parse_integer(s, long_arg)) return arg_unreadable;
1692 return check_memory_size(*long_arg, min_size, max_size);
1693 }
1694
1695 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) {
1696 // Save default settings for some mode flags
1697 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1698 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1699 Arguments::_ClipInlining = ClipInlining;
1700 Arguments::_BackgroundCompilation = BackgroundCompilation;
1701
1702 // Remember the default value of SharedBaseAddress.
1703 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1704
1705 // Setup flags for mixed which is the default
1706 set_mode_flags(_mixed);
1707
1708 jint result;
1709 for (int i = 0; i < all_args->length(); i++) {
1710 result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin);
1711 if (result != JNI_OK) {
1712 return result;
1713 }
1714 }
1715
1716 // Disable CDS for exploded image
1717 if (!has_jimage()) {
1718 no_shared_spaces("CDS disabled on exploded JDK");
1719 }
1720
1721 // We need to ensure processor and memory resources have been properly
1722 // configured - which may rely on arguments we just processed - before
1723 // doing the final argument processing. Any argument processing that
1724 // needs to know about processor and memory resources must occur after
1725 // this point.
1726
1727 os::init_container_support();
1728
1729 SystemMemoryBarrier::initialize();
1730
1731 // Do final processing now that all arguments have been parsed
1732 result = finalize_vm_init_args();
1733 if (result != JNI_OK) {
1734 return result;
1735 }
1736
1737 return JNI_OK;
1738 }
1739
1740 #if !INCLUDE_JVMTI || INCLUDE_CDS
1741 // Checks if name in command-line argument -agent{lib,path}:name[=options]
1742 // represents a valid JDWP agent. is_path==true denotes that we
1743 // are dealing with -agentpath (case where name is a path), otherwise with
1744 // -agentlib
1745 static bool valid_jdwp_agent(char *name, bool is_path) {
1746 char *_name;
1747 const char *_jdwp = "jdwp";
1748 size_t _len_jdwp, _len_prefix;
1749
1750 if (is_path) {
1751 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
1752 return false;
1753 }
1754
1755 _name++; // skip past last path separator
1756 _len_prefix = strlen(JNI_LIB_PREFIX);
1757
1758 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
1759 return false;
1760 }
1761
1762 _name += _len_prefix;
1763 _len_jdwp = strlen(_jdwp);
1764
1765 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
1766 _name += _len_jdwp;
1767 }
1768 else {
1769 return false;
1770 }
1771
1772 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
1773 return false;
1774 }
1775
1776 return true;
1777 }
1778
1779 if (strcmp(name, _jdwp) == 0) {
1780 return true;
1781 }
1782
1783 return false;
1784 }
1785 #endif
1786
1787 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
1788 // --patch-module=<module>=<file>(<pathsep><file>)*
1789 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
1790 // Find the equal sign between the module name and the path specification
1791 const char* module_equal = strchr(patch_mod_tail, '=');
1792 if (module_equal == nullptr) {
1793 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
1794 return JNI_ERR;
1795 } else {
1796 // Pick out the module name
1797 size_t module_len = module_equal - patch_mod_tail;
1798 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
1799 if (module_name != nullptr) {
1800 memcpy(module_name, patch_mod_tail, module_len);
1801 *(module_name + module_len) = '\0';
1802 // The path piece begins one past the module_equal sign
1803 add_patch_mod_prefix(module_name, module_equal + 1);
1804 FREE_C_HEAP_ARRAY(module_name);
1805 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
1806 return JNI_ENOMEM;
1807 }
1808 } else {
1809 return JNI_ENOMEM;
1810 }
1811 }
1812 return JNI_OK;
1813 }
1814
1815 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
1816 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
1817 // The min and max sizes match the values in globals.hpp, but scaled
1818 // with K. The values have been chosen so that alignment with page
1819 // size doesn't change the max value, which makes the conversions
1820 // back and forth between Xss value and ThreadStackSize value easier.
1821 // The values have also been chosen to fit inside a 32-bit signed type.
1822 const julong min_ThreadStackSize = 0;
1823 const julong max_ThreadStackSize = 1 * M;
1824
1825 // Make sure the above values match the range set in globals.hpp
1826 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
1827 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
1828 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
1829
1830 const julong min_size = min_ThreadStackSize * K;
1831 const julong max_size = max_ThreadStackSize * K;
1832
1833 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
1834
1835 julong size = 0;
1836 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
1837 if (errcode != arg_in_range) {
1838 bool silent = (option == nullptr); // Allow testing to silence error messages
1839 if (!silent) {
1840 jio_fprintf(defaultStream::error_stream(),
1841 "Invalid thread stack size: %s\n", option->optionString);
1842 describe_range_error(errcode);
1843 }
1844 return JNI_EINVAL;
1845 }
1846
1847 // Internally track ThreadStackSize in units of 1024 bytes.
1848 const julong size_aligned = align_up(size, K);
1849 assert(size <= size_aligned,
1850 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
1851 size, size_aligned);
1852
1853 const julong size_in_K = size_aligned / K;
1854 assert(size_in_K < (julong)max_intx,
1855 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
1856 size_in_K);
1857
1858 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
1859 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
1860 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
1861 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
1862 max_expanded, size_in_K);
1863
1864 *out_ThreadStackSize = (intx)size_in_K;
1865
1866 return JNI_OK;
1867 }
1868
1869 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
1870 // For match_option to return remaining or value part of option string
1871 const char* tail;
1872
1873 // iterate over arguments
1874 for (int index = 0; index < args->nOptions; index++) {
1875 bool is_absolute_path = false; // for -agentpath vs -agentlib
1876
1877 const JavaVMOption* option = args->options + index;
1878
1879 if (!match_option(option, "-Djava.class.path", &tail) &&
1880 !match_option(option, "-Dsun.java.command", &tail) &&
1881 !match_option(option, "-Dsun.java.launcher", &tail)) {
1882
1883 // add all jvm options to the jvm_args string. This string
1884 // is used later to set the java.vm.args PerfData string constant.
1885 // the -Djava.class.path and the -Dsun.java.command options are
1886 // omitted from jvm_args string as each have their own PerfData
1887 // string constant object.
1888 build_jvm_args(option->optionString);
1889 }
1890
1891 // -verbose:[class/module/gc/jni]
1892 if (match_option(option, "-verbose", &tail)) {
1893 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
1894 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
1895 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
1896 } else if (!strcmp(tail, ":module")) {
1897 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
1898 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
1899 } else if (!strcmp(tail, ":gc")) {
1900 if (_legacyGCLogging.lastFlag == 0) {
1901 _legacyGCLogging.lastFlag = 1;
1902 }
1903 } else if (!strcmp(tail, ":jni")) {
1904 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
1905 }
1906 // -da / -ea / -disableassertions / -enableassertions
1907 // These accept an optional class/package name separated by a colon, e.g.,
1908 // -da:java.lang.Thread.
1909 } else if (match_option(option, user_assertion_options, &tail, true)) {
1910 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1911 if (*tail == '\0') {
1912 JavaAssertions::setUserClassDefault(enable);
1913 } else {
1914 assert(*tail == ':', "bogus match by match_option()");
1915 JavaAssertions::addOption(tail + 1, enable);
1916 }
1917 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
1918 } else if (match_option(option, system_assertion_options, &tail, false)) {
1919 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1920 JavaAssertions::setSystemClassDefault(enable);
1921 // -bootclasspath:
1922 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
1923 jio_fprintf(defaultStream::output_stream(),
1924 "-Xbootclasspath is no longer a supported option.\n");
1925 return JNI_EINVAL;
1926 // -bootclasspath/a:
1927 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
1928 Arguments::append_sysclasspath(tail);
1929 // -bootclasspath/p:
1930 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
1931 jio_fprintf(defaultStream::output_stream(),
1932 "-Xbootclasspath/p is no longer a supported option.\n");
1933 return JNI_EINVAL;
1934 // -Xrun
1935 } else if (match_option(option, "-Xrun", &tail)) {
1936 if (tail != nullptr) {
1937 const char* pos = strchr(tail, ':');
1938 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
1939 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
1940 jio_snprintf(name, len + 1, "%s", tail);
1941
1942 char *options = nullptr;
1943 if(pos != nullptr) {
1944 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
1945 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
1946 }
1947 #if !INCLUDE_JVMTI
1948 if (strcmp(name, "jdwp") == 0) {
1949 jio_fprintf(defaultStream::error_stream(),
1950 "Debugging agents are not supported in this VM\n");
1951 return JNI_ERR;
1952 }
1953 #endif // !INCLUDE_JVMTI
1954 JvmtiAgentList::add_xrun(name, options, false);
1955 FREE_C_HEAP_ARRAY(name);
1956 FREE_C_HEAP_ARRAY(options);
1957 }
1958 } else if (match_option(option, "--add-reads=", &tail)) {
1959 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
1960 return JNI_ENOMEM;
1961 }
1962 } else if (match_option(option, "--add-exports=", &tail)) {
1963 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
1964 return JNI_ENOMEM;
1965 }
1966 } else if (match_option(option, "--add-opens=", &tail)) {
1967 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
1968 return JNI_ENOMEM;
1969 }
1970 } else if (match_option(option, "--add-modules=", &tail)) {
1971 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
1972 return JNI_ENOMEM;
1973 }
1974 } else if (match_option(option, "--enable-native-access=", &tail)) {
1975 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
1976 return JNI_ENOMEM;
1977 }
1978 } else if (match_option(option, "--illegal-native-access=", &tail)) {
1979 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
1980 return JNI_ENOMEM;
1981 }
1982 } else if (match_option(option, "--limit-modules=", &tail)) {
1983 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
1984 return JNI_ENOMEM;
1985 }
1986 } else if (match_option(option, "--module-path=", &tail)) {
1987 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
1988 return JNI_ENOMEM;
1989 }
1990 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
1991 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
1992 return JNI_ENOMEM;
1993 }
1994 } else if (match_option(option, "--patch-module=", &tail)) {
1995 // --patch-module=<module>=<file>(<pathsep><file>)*
1996 int res = process_patch_mod_option(tail);
1997 if (res != JNI_OK) {
1998 return res;
1999 }
2000 } else if (match_option(option, "--enable-final-field-mutation=", &tail)) {
2001 if (!create_numbered_module_property("jdk.module.enable.final.field.mutation", tail, enable_final_field_mutation++)) {
2002 return JNI_ENOMEM;
2003 }
2004 } else if (match_option(option, "--illegal-final-field-mutation=", &tail)) {
2005 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2006 PropertyList_unique_add(&_system_properties, "jdk.module.illegal.final.field.mutation", tail,
2007 AddProperty, WriteableProperty, InternalProperty);
2008 } else {
2009 jio_fprintf(defaultStream::error_stream(),
2010 "Value specified to --illegal-final-field-mutation not recognized: '%s'\n", tail);
2011 return JNI_ERR;
2012 }
2013 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2014 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2015 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2016 AddProperty, WriteableProperty, InternalProperty);
2017 } else {
2018 jio_fprintf(defaultStream::error_stream(),
2019 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2020 return JNI_ERR;
2021 }
2022 } else if (match_option(option, "--illegal-access=", &tail)) {
2023 char version[256];
2024 JDK_Version::jdk(17).to_string(version, sizeof(version));
2025 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2026 // -agentlib and -agentpath
2027 } else if (match_option(option, "-agentlib:", &tail) ||
2028 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2029 if(tail != nullptr) {
2030 const char* pos = strchr(tail, '=');
2031 char* name;
2032 if (pos == nullptr) {
2033 name = os::strdup_check_oom(tail, mtArguments);
2034 } else {
2035 size_t len = pos - tail;
2036 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2037 memcpy(name, tail, len);
2038 name[len] = '\0';
2039 }
2040
2041 char *options = nullptr;
2042 if(pos != nullptr) {
2043 options = os::strdup_check_oom(pos + 1, mtArguments);
2044 }
2045 #if !INCLUDE_JVMTI
2046 if (valid_jdwp_agent(name, is_absolute_path)) {
2047 jio_fprintf(defaultStream::error_stream(),
2048 "Debugging agents are not supported in this VM\n");
2049 return JNI_ERR;
2050 }
2051 #elif INCLUDE_CDS
2052 if (valid_jdwp_agent(name, is_absolute_path)) {
2053 _has_jdwp_agent = true;
2054 }
2055 #endif // !INCLUDE_JVMTI
2056 JvmtiAgentList::add(name, options, is_absolute_path);
2057 os::free(name);
2058 os::free(options);
2059 }
2060 // -javaagent
2061 } else if (match_option(option, "-javaagent:", &tail)) {
2062 #if !INCLUDE_JVMTI
2063 jio_fprintf(defaultStream::error_stream(),
2064 "Instrumentation agents are not supported in this VM\n");
2065 return JNI_ERR;
2066 #else
2067 if (tail != nullptr) {
2068 size_t length = strlen(tail) + 1;
2069 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2070 jio_snprintf(options, length, "%s", tail);
2071 JvmtiAgentList::add("instrument", options, false);
2072 FREE_C_HEAP_ARRAY(options);
2073
2074 // java agents need module java.instrument
2075 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2076 return JNI_ENOMEM;
2077 }
2078 }
2079 #endif // !INCLUDE_JVMTI
2080 // --enable_preview
2081 } else if (match_option(option, "--enable-preview")) {
2082 set_enable_preview();
2083 // -Xnoclassgc
2084 } else if (match_option(option, "-Xnoclassgc")) {
2085 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2086 return JNI_EINVAL;
2087 }
2088 // -Xbatch
2089 } else if (match_option(option, "-Xbatch")) {
2090 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2091 return JNI_EINVAL;
2092 }
2093 // -Xmn for compatibility with other JVM vendors
2094 } else if (match_option(option, "-Xmn", &tail)) {
2095 julong long_initial_young_size = 0;
2096 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2097 if (errcode != arg_in_range) {
2098 jio_fprintf(defaultStream::error_stream(),
2099 "Invalid initial young generation size: %s\n", option->optionString);
2100 describe_range_error(errcode);
2101 return JNI_EINVAL;
2102 }
2103 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2104 return JNI_EINVAL;
2105 }
2106 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2107 return JNI_EINVAL;
2108 }
2109 // -Xms
2110 } else if (match_option(option, "-Xms", &tail)) {
2111 julong size = 0;
2112 // an initial heap size of 0 means automatically determine
2113 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2114 if (errcode != arg_in_range) {
2115 jio_fprintf(defaultStream::error_stream(),
2116 "Invalid initial heap size: %s\n", option->optionString);
2117 describe_range_error(errcode);
2118 return JNI_EINVAL;
2119 }
2120 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2121 return JNI_EINVAL;
2122 }
2123 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2124 return JNI_EINVAL;
2125 }
2126 // -Xmx
2127 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2128 julong long_max_heap_size = 0;
2129 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2130 if (errcode != arg_in_range) {
2131 jio_fprintf(defaultStream::error_stream(),
2132 "Invalid maximum heap size: %s\n", option->optionString);
2133 describe_range_error(errcode);
2134 return JNI_EINVAL;
2135 }
2136 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2137 return JNI_EINVAL;
2138 }
2139 // Xmaxf
2140 } else if (match_option(option, "-Xmaxf", &tail)) {
2141 char* err;
2142 double dmaxf = strtod(tail, &err);
2143 if (*err != '\0' || *tail == '\0') {
2144 jio_fprintf(defaultStream::error_stream(),
2145 "Bad max heap free ratio: %s\n",
2146 option->optionString);
2147 return JNI_EINVAL;
2148 }
2149 if (dmaxf < 0.0 || dmaxf > 1.0) {
2150 jio_fprintf(defaultStream::error_stream(),
2151 "-Xmaxf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2152 option->optionString);
2153 return JNI_EINVAL;
2154 }
2155 const uintx umaxf = (uintx)(dmaxf * 100);
2156 if (MinHeapFreeRatio > umaxf) {
2157 jio_fprintf(defaultStream::error_stream(),
2158 "-Xmaxf value (%s) must be greater than or equal to the implicit -Xminf value (%.2f)\n",
2159 tail, MinHeapFreeRatio / 100.0f);
2160 return JNI_EINVAL;
2161 }
2162 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, umaxf) != JVMFlag::SUCCESS) {
2163 return JNI_EINVAL;
2164 }
2165 // Xminf
2166 } else if (match_option(option, "-Xminf", &tail)) {
2167 char* err;
2168 double dminf = strtod(tail, &err);
2169 if (*err != '\0' || *tail == '\0') {
2170 jio_fprintf(defaultStream::error_stream(),
2171 "Bad min heap free ratio: %s\n",
2172 option->optionString);
2173 return JNI_EINVAL;
2174 }
2175 if (dminf < 0.0 || dminf > 1.0) {
2176 jio_fprintf(defaultStream::error_stream(),
2177 "-Xminf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2178 tail);
2179 return JNI_EINVAL;
2180 }
2181 const uintx uminf = (uintx)(dminf * 100);
2182 if (MaxHeapFreeRatio < uminf) {
2183 jio_fprintf(defaultStream::error_stream(),
2184 "-Xminf value (%s) must be less than or equal to the implicit -Xmaxf value (%.2f)\n",
2185 tail, MaxHeapFreeRatio / 100.0f);
2186 return JNI_EINVAL;
2187 }
2188 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, uminf) != JVMFlag::SUCCESS) {
2189 return JNI_EINVAL;
2190 }
2191 // -Xss
2192 } else if (match_option(option, "-Xss", &tail)) {
2193 intx value = 0;
2194 jint err = parse_xss(option, tail, &value);
2195 if (err != JNI_OK) {
2196 return err;
2197 }
2198 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2199 return JNI_EINVAL;
2200 }
2201 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2202 warning("Ignoring option %s; support was removed in JDK 27", option->optionString);
2203 } else if (match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2204 julong long_ReservedCodeCacheSize = 0;
2205
2206 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2207 if (errcode != arg_in_range) {
2208 jio_fprintf(defaultStream::error_stream(),
2209 "Invalid maximum code cache size: %s.\n", option->optionString);
2210 return JNI_EINVAL;
2211 }
2212 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2213 return JNI_EINVAL;
2214 }
2215 // -green
2216 } else if (match_option(option, "-green")) {
2217 jio_fprintf(defaultStream::error_stream(),
2218 "Green threads support not available\n");
2219 return JNI_EINVAL;
2220 // -native
2221 } else if (match_option(option, "-native")) {
2222 // HotSpot always uses native threads, ignore silently for compatibility
2223 // -Xrs
2224 } else if (match_option(option, "-Xrs")) {
2225 // Classic/EVM option, new functionality
2226 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2227 return JNI_EINVAL;
2228 }
2229 // -Xprof
2230 } else if (match_option(option, "-Xprof")) {
2231 char version[256];
2232 // Obsolete in JDK 10
2233 JDK_Version::jdk(10).to_string(version, sizeof(version));
2234 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2235 // -Xinternalversion
2236 } else if (match_option(option, "-Xinternalversion")) {
2237 jio_fprintf(defaultStream::output_stream(), "%s\n",
2238 VM_Version::internal_vm_info_string());
2239 vm_exit(0);
2240 #ifndef PRODUCT
2241 // -Xprintflags
2242 } else if (match_option(option, "-Xprintflags")) {
2243 JVMFlag::printFlags(tty, false);
2244 vm_exit(0);
2245 #endif
2246 // -D
2247 } else if (match_option(option, "-D", &tail)) {
2248 const char* value;
2249 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2250 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2251 // abort if -Djava.endorsed.dirs is set
2252 jio_fprintf(defaultStream::output_stream(),
2253 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2254 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2255 return JNI_EINVAL;
2256 }
2257 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2258 *value != '\0' && strcmp(value, "\"\"") != 0) {
2259 // abort if -Djava.ext.dirs is set
2260 jio_fprintf(defaultStream::output_stream(),
2261 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2262 return JNI_EINVAL;
2263 }
2264 // Check for module related properties. They must be set using the modules
2265 // options. For example: use "--add-modules=java.sql", not
2266 // "-Djdk.module.addmods=java.sql"
2267 if (is_internal_module_property(option->optionString + 2)) {
2268 needs_module_property_warning = true;
2269 continue;
2270 }
2271 if (!add_property(tail)) {
2272 return JNI_ENOMEM;
2273 }
2274 // Out of the box management support
2275 if (match_option(option, "-Dcom.sun.management", &tail)) {
2276 #if INCLUDE_MANAGEMENT
2277 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2278 return JNI_EINVAL;
2279 }
2280 // management agent in module jdk.management.agent
2281 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2282 return JNI_ENOMEM;
2283 }
2284 #else
2285 jio_fprintf(defaultStream::output_stream(),
2286 "-Dcom.sun.management is not supported in this VM.\n");
2287 return JNI_ERR;
2288 #endif
2289 }
2290 // -Xint
2291 } else if (match_option(option, "-Xint")) {
2292 set_mode_flags(_int);
2293 mode_flag_cmd_line = true;
2294 // -Xmixed
2295 } else if (match_option(option, "-Xmixed")) {
2296 set_mode_flags(_mixed);
2297 mode_flag_cmd_line = true;
2298 // -Xcomp
2299 } else if (match_option(option, "-Xcomp")) {
2300 // for testing the compiler; turn off all flags that inhibit compilation
2301 set_mode_flags(_comp);
2302 mode_flag_cmd_line = true;
2303 // -Xshare:dump
2304 } else if (match_option(option, "-Xshare:dump")) {
2305 CDSConfig::enable_dumping_static_archive();
2306 CDSConfig::set_old_cds_flags_used();
2307 // -Xshare:on
2308 } else if (match_option(option, "-Xshare:on")) {
2309 UseSharedSpaces = true;
2310 RequireSharedSpaces = true;
2311 CDSConfig::set_old_cds_flags_used();
2312 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2313 } else if (match_option(option, "-Xshare:auto")) {
2314 UseSharedSpaces = true;
2315 RequireSharedSpaces = false;
2316 xshare_auto_cmd_line = true;
2317 CDSConfig::set_old_cds_flags_used();
2318 // -Xshare:off
2319 } else if (match_option(option, "-Xshare:off")) {
2320 UseSharedSpaces = false;
2321 RequireSharedSpaces = false;
2322 CDSConfig::set_old_cds_flags_used();
2323 // -Xverify
2324 } else if (match_option(option, "-Xverify", &tail)) {
2325 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2326 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2327 return JNI_EINVAL;
2328 }
2329 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2330 return JNI_EINVAL;
2331 }
2332 } else if (strcmp(tail, ":remote") == 0) {
2333 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2334 return JNI_EINVAL;
2335 }
2336 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2337 return JNI_EINVAL;
2338 }
2339 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2340 return JNI_EINVAL;
2341 }
2342 // -Xdebug
2343 } else if (match_option(option, "-Xdebug")) {
2344 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2345 } else if (match_option(option, "-Xloggc:", &tail)) {
2346 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2347 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2348 _legacyGCLogging.lastFlag = 2;
2349 _legacyGCLogging.file = os::strdup_check_oom(tail);
2350 } else if (match_option(option, "-Xlog", &tail)) {
2351 bool ret = false;
2352 if (strcmp(tail, ":help") == 0) {
2353 fileStream stream(defaultStream::output_stream());
2354 LogConfiguration::print_command_line_help(&stream);
2355 vm_exit(0);
2356 } else if (strcmp(tail, ":disable") == 0) {
2357 LogConfiguration::disable_logging();
2358 ret = true;
2359 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2360 const char* async_tail = tail + strlen(":async");
2361 ret = LogConfiguration::parse_async_argument(async_tail);
2362 } else if (*tail == '\0') {
2363 ret = LogConfiguration::parse_command_line_arguments();
2364 assert(ret, "-Xlog without arguments should never fail to parse");
2365 } else if (*tail == ':') {
2366 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2367 }
2368 if (ret == false) {
2369 jio_fprintf(defaultStream::error_stream(),
2370 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2371 tail);
2372 return JNI_EINVAL;
2373 }
2374 // JNI hooks
2375 } else if (match_option(option, "-Xcheck", &tail)) {
2376 if (!strcmp(tail, ":jni")) {
2377 #if !INCLUDE_JNI_CHECK
2378 warning("JNI CHECKING is not supported in this VM");
2379 #else
2380 CheckJNICalls = true;
2381 #endif // INCLUDE_JNI_CHECK
2382 } else if (is_bad_option(option, args->ignoreUnrecognized,
2383 "check")) {
2384 return JNI_EINVAL;
2385 }
2386 } else if (match_option(option, "vfprintf")) {
2387 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2388 } else if (match_option(option, "exit")) {
2389 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2390 } else if (match_option(option, "abort")) {
2391 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2392 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2393 // and the last option wins.
2394 } else if (match_option(option, "-XX:+NeverTenure")) {
2395 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2396 return JNI_EINVAL;
2397 }
2398 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2399 return JNI_EINVAL;
2400 }
2401 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2402 return JNI_EINVAL;
2403 }
2404 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2405 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2406 return JNI_EINVAL;
2407 }
2408 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2409 return JNI_EINVAL;
2410 }
2411 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2412 return JNI_EINVAL;
2413 }
2414 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2415 uint max_tenuring_thresh = 0;
2416 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2417 jio_fprintf(defaultStream::error_stream(),
2418 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2419 return JNI_EINVAL;
2420 }
2421
2422 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2423 return JNI_EINVAL;
2424 }
2425
2426 if (MaxTenuringThreshold == 0) {
2427 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2428 return JNI_EINVAL;
2429 }
2430 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2431 return JNI_EINVAL;
2432 }
2433 } else {
2434 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2435 return JNI_EINVAL;
2436 }
2437 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2438 return JNI_EINVAL;
2439 }
2440 }
2441 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2442 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2443 return JNI_EINVAL;
2444 }
2445 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2446 return JNI_EINVAL;
2447 }
2448 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2449 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2450 return JNI_EINVAL;
2451 }
2452 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2453 return JNI_EINVAL;
2454 }
2455 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2456 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2457 return JNI_EINVAL;
2458 }
2459 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2460 return JNI_EINVAL;
2461 }
2462 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2463 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2464 return JNI_EINVAL;
2465 }
2466 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2467 return JNI_EINVAL;
2468 }
2469 } else if (match_option(option, "--finalization=", &tail)) {
2470 if (strcmp(tail, "enabled") == 0) {
2471 InstanceKlass::set_finalization_enabled(true);
2472 } else if (strcmp(tail, "disabled") == 0) {
2473 InstanceKlass::set_finalization_enabled(false);
2474 } else {
2475 jio_fprintf(defaultStream::error_stream(),
2476 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2477 tail);
2478 return JNI_EINVAL;
2479 }
2480 #if !defined(DTRACE_ENABLED)
2481 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2482 jio_fprintf(defaultStream::error_stream(),
2483 "DTraceMethodProbes flag is not applicable for this configuration\n");
2484 return JNI_EINVAL;
2485 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2486 jio_fprintf(defaultStream::error_stream(),
2487 "DTraceAllocProbes flag is not applicable for this configuration\n");
2488 return JNI_EINVAL;
2489 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2490 jio_fprintf(defaultStream::error_stream(),
2491 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2492 return JNI_EINVAL;
2493 #endif // !defined(DTRACE_ENABLED)
2494 #ifdef ASSERT
2495 } else if (match_option(option, "-XX:+FullGCALot")) {
2496 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2497 return JNI_EINVAL;
2498 }
2499 #endif
2500 #if !INCLUDE_MANAGEMENT
2501 } else if (match_option(option, "-XX:+ManagementServer")) {
2502 jio_fprintf(defaultStream::error_stream(),
2503 "ManagementServer is not supported in this VM.\n");
2504 return JNI_ERR;
2505 #endif // INCLUDE_MANAGEMENT
2506 #if INCLUDE_JFR
2507 } else if (match_jfr_option(&option)) {
2508 return JNI_EINVAL;
2509 #endif
2510 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2511 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2512 // already been handled
2513 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2514 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2515 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2516 return JNI_EINVAL;
2517 }
2518 }
2519 // Unknown option
2520 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2521 return JNI_ERR;
2522 }
2523 }
2524
2525 // PrintSharedArchiveAndExit will turn on
2526 // -Xshare:on
2527 // -Xlog:class+path=info
2528 if (PrintSharedArchiveAndExit) {
2529 UseSharedSpaces = true;
2530 RequireSharedSpaces = true;
2531 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2532 }
2533
2534 fix_appclasspath();
2535
2536 return JNI_OK;
2537 }
2538
2539 void Arguments::set_ext_dirs(char *value) {
2540 _ext_dirs = os::strdup_check_oom(value);
2541 }
2542
2543 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) {
2544 // For java.base check for duplicate --patch-module options being specified on the command line.
2545 // This check is only required for java.base, all other duplicate module specifications
2546 // will be checked during module system initialization. The module system initialization
2547 // will throw an ExceptionInInitializerError if this situation occurs.
2548 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2549 if (patch_mod_javabase) {
2550 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2551 } else {
2552 patch_mod_javabase = true;
2553 }
2554 }
2555
2556 // Create GrowableArray lazily, only if --patch-module has been specified
2557 if (_patch_mod_prefix == nullptr) {
2558 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2559 }
2560
2561 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2562 }
2563
2564 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2565 //
2566 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2567 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2568 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2569 // path is treated as the current directory.
2570 //
2571 // This causes problems with CDS, which requires that all directories specified in the classpath
2572 // must be empty. In most cases, applications do NOT want to load classes from the current
2573 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2574 // scripts compatible with CDS.
2575 void Arguments::fix_appclasspath() {
2576 if (IgnoreEmptyClassPaths) {
2577 const char separator = *os::path_separator();
2578 const char* src = _java_class_path->value();
2579
2580 // skip over all the leading empty paths
2581 while (*src == separator) {
2582 src ++;
2583 }
2584
2585 char* copy = os::strdup_check_oom(src, mtArguments);
2586
2587 // trim all trailing empty paths
2588 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2589 *tail = '\0';
2590 }
2591
2592 char from[3] = {separator, separator, '\0'};
2593 char to [2] = {separator, '\0'};
2594 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2595 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2596 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2597 }
2598
2599 _java_class_path->set_writeable_value(copy);
2600 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2601 }
2602 }
2603
2604 jint Arguments::finalize_vm_init_args() {
2605 // check if the default lib/endorsed directory exists; if so, error
2606 char path[JVM_MAXPATHLEN];
2607 const char* fileSep = os::file_separator();
2608 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2609
2610 DIR* dir = os::opendir(path);
2611 if (dir != nullptr) {
2612 jio_fprintf(defaultStream::output_stream(),
2613 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2614 "in modular form will be supported via the concept of upgradeable modules.\n");
2615 os::closedir(dir);
2616 return JNI_ERR;
2617 }
2618
2619 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2620 dir = os::opendir(path);
2621 if (dir != nullptr) {
2622 jio_fprintf(defaultStream::output_stream(),
2623 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2624 "Use -classpath instead.\n.");
2625 os::closedir(dir);
2626 return JNI_ERR;
2627 }
2628
2629 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2630 // but like -Xint, leave compilation thresholds unaffected.
2631 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2632 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2633 set_mode_flags(_int);
2634 }
2635
2636 #ifdef ZERO
2637 // Zero always runs in interpreted mode
2638 set_mode_flags(_int);
2639 #endif
2640
2641 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2642 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2643 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2644 }
2645
2646 #ifndef COMPILER2
2647 // Don't degrade server performance for footprint
2648 if (FLAG_IS_DEFAULT(UseLargePages) &&
2649 MaxHeapSize < LargePageHeapSizeThreshold) {
2650 // No need for large granularity pages w/small heaps.
2651 // Note that large pages are enabled/disabled for both the
2652 // Java heap and the code cache.
2653 FLAG_SET_DEFAULT(UseLargePages, false);
2654 }
2655
2656 UNSUPPORTED_OPTION(ProfileInterpreter);
2657 #endif // !COMPILER2
2658
2659 // Parse the CompilationMode flag
2660 if (!CompilationModeFlag::initialize()) {
2661 return JNI_ERR;
2662 }
2663
2664 // Called after ClassLoader::lookup_vm_options() but before class loading begins.
2665 ClassLoader::set_preview_mode(is_valhalla_enabled());
2666
2667 if (!check_vm_args_consistency()) {
2668 return JNI_ERR;
2669 }
2670
2671
2672 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2673 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2674 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2675
2676 return JNI_OK;
2677 }
2678
2679 // Helper class for controlling the lifetime of JavaVMInitArgs
2680 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2681 // deleted on the destruction of the ScopedVMInitArgs object.
2682 class ScopedVMInitArgs : public StackObj {
2683 private:
2684 JavaVMInitArgs _args;
2685 char* _container_name;
2686 bool _is_set;
2687 char* _vm_options_file_arg;
2688
2689 public:
2690 ScopedVMInitArgs(const char *container_name) {
2691 _args.version = JNI_VERSION_1_2;
2692 _args.nOptions = 0;
2693 _args.options = nullptr;
2694 _args.ignoreUnrecognized = false;
2695 _container_name = (char *)container_name;
2696 _is_set = false;
2697 _vm_options_file_arg = nullptr;
2698 }
2699
2700 // Populates the JavaVMInitArgs object represented by this
2701 // ScopedVMInitArgs object with the arguments in options. The
2702 // allocated memory is deleted by the destructor. If this method
2703 // returns anything other than JNI_OK, then this object is in a
2704 // partially constructed state, and should be abandoned.
2705 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
2706 _is_set = true;
2707 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
2708 JavaVMOption, options->length(), mtArguments);
2709 if (options_arr == nullptr) {
2710 return JNI_ENOMEM;
2711 }
2712 _args.options = options_arr;
2713
2714 for (int i = 0; i < options->length(); i++) {
2715 options_arr[i] = options->at(i);
2716 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
2717 if (options_arr[i].optionString == nullptr) {
2718 // Rely on the destructor to do cleanup.
2719 _args.nOptions = i;
2720 return JNI_ENOMEM;
2721 }
2722 }
2723
2724 _args.nOptions = options->length();
2725 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2726 return JNI_OK;
2727 }
2728
2729 JavaVMInitArgs* get() { return &_args; }
2730 char* container_name() { return _container_name; }
2731 bool is_set() { return _is_set; }
2732 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
2733 char* vm_options_file_arg() { return _vm_options_file_arg; }
2734
2735 void set_vm_options_file_arg(const char *vm_options_file_arg) {
2736 if (_vm_options_file_arg != nullptr) {
2737 os::free(_vm_options_file_arg);
2738 }
2739 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
2740 }
2741
2742 ~ScopedVMInitArgs() {
2743 if (_vm_options_file_arg != nullptr) {
2744 os::free(_vm_options_file_arg);
2745 }
2746 if (_args.options == nullptr) return;
2747 for (int i = 0; i < _args.nOptions; i++) {
2748 os::free(_args.options[i].optionString);
2749 }
2750 FREE_C_HEAP_ARRAY(_args.options);
2751 }
2752
2753 // Insert options into this option list, to replace option at
2754 // vm_options_file_pos (-XX:VMOptionsFile)
2755 jint insert(const JavaVMInitArgs* args,
2756 const JavaVMInitArgs* args_to_insert,
2757 const int vm_options_file_pos) {
2758 assert(_args.options == nullptr, "shouldn't be set yet");
2759 assert(args_to_insert->nOptions != 0, "there should be args to insert");
2760 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
2761
2762 int length = args->nOptions + args_to_insert->nOptions - 1;
2763 // Construct new option array
2764 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
2765 for (int i = 0; i < args->nOptions; i++) {
2766 if (i == vm_options_file_pos) {
2767 // insert the new options starting at the same place as the
2768 // -XX:VMOptionsFile option
2769 for (int j = 0; j < args_to_insert->nOptions; j++) {
2770 options.push(args_to_insert->options[j]);
2771 }
2772 } else {
2773 options.push(args->options[i]);
2774 }
2775 }
2776 // make into options array
2777 return set_args(&options);
2778 }
2779 };
2780
2781 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
2782 return parse_options_environment_variable("_JAVA_OPTIONS", args);
2783 }
2784
2785 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
2786 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
2787 }
2788
2789 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) {
2790 for (int index = args->nOptions - 1; index >= 0; index--) {
2791 JavaVMOption* option = args->options + index;
2792 if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) {
2793 return option;
2794 }
2795 }
2796
2797 return nullptr;
2798 }
2799
2800 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args,
2801 ScopedVMInitArgs* jdk_aot_vm_options_args) {
2802 // Don't bother scanning all the args if this env variable is not set
2803 if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) {
2804 return JNI_OK;
2805 }
2806
2807 // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value
2808 // of AOTMode.
2809 JavaVMOption* option = nullptr;
2810 for (int i = all_args->length() - 1; i >= 0; i--) {
2811 if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) {
2812 break;
2813 }
2814 }
2815
2816 if (option != nullptr) {
2817 // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet,
2818 // so its value is not reflected inside the global variable AOTMode.
2819 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) {
2820 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
2821 }
2822 } else {
2823 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode,
2824 // which would have been set inside process_settings_file();
2825 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) {
2826 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
2827 }
2828 }
2829
2830 return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args);
2831 }
2832
2833 jint Arguments::parse_options_environment_variable(const char* name,
2834 ScopedVMInitArgs* vm_args) {
2835 char *buffer = ::getenv(name);
2836
2837 // Don't check this environment variable if user has special privileges
2838 // (e.g. unix su command).
2839 if (buffer == nullptr || os::have_special_privileges()) {
2840 return JNI_OK;
2841 }
2842
2843 if ((buffer = os::strdup(buffer)) == nullptr) {
2844 return JNI_ENOMEM;
2845 }
2846
2847 jio_fprintf(defaultStream::error_stream(),
2848 "Picked up %s: %s\n", name, buffer);
2849
2850 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
2851
2852 os::free(buffer);
2853 return retcode;
2854 }
2855
2856 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
2857 // read file into buffer
2858 int fd = ::open(file_name, O_RDONLY);
2859 if (fd < 0) {
2860 jio_fprintf(defaultStream::error_stream(),
2861 "Could not open options file '%s'\n",
2862 file_name);
2863 return JNI_ERR;
2864 }
2865
2866 struct stat stbuf;
2867 int retcode = os::stat(file_name, &stbuf);
2868 if (retcode != 0) {
2869 jio_fprintf(defaultStream::error_stream(),
2870 "Could not stat options file '%s'\n",
2871 file_name);
2872 ::close(fd);
2873 return JNI_ERR;
2874 }
2875
2876 if (stbuf.st_size == 0) {
2877 // tell caller there is no option data and that is ok
2878 ::close(fd);
2879 return JNI_OK;
2880 }
2881
2882 // '+ 1' for null termination even with max bytes
2883 size_t bytes_alloc = stbuf.st_size + 1;
2884
2885 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
2886 if (nullptr == buf) {
2887 jio_fprintf(defaultStream::error_stream(),
2888 "Could not allocate read buffer for options file parse\n");
2889 ::close(fd);
2890 return JNI_ENOMEM;
2891 }
2892
2893 memset(buf, 0, bytes_alloc);
2894
2895 // Fill buffer
2896 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
2897 ::close(fd);
2898 if (bytes_read < 0) {
2899 FREE_C_HEAP_ARRAY(buf);
2900 jio_fprintf(defaultStream::error_stream(),
2901 "Could not read options file '%s'\n", file_name);
2902 return JNI_ERR;
2903 }
2904
2905 if (bytes_read == 0) {
2906 // tell caller there is no option data and that is ok
2907 FREE_C_HEAP_ARRAY(buf);
2908 return JNI_OK;
2909 }
2910
2911 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
2912
2913 FREE_C_HEAP_ARRAY(buf);
2914 return retcode;
2915 }
2916
2917 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
2918 // Construct option array
2919 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
2920
2921 // some pointers to help with parsing
2922 char *buffer_end = buffer + buf_len;
2923 char *opt_hd = buffer;
2924 char *wrt = buffer;
2925 char *rd = buffer;
2926
2927 // parse all options
2928 while (rd < buffer_end) {
2929 // skip leading white space from the input string
2930 while (rd < buffer_end && isspace((unsigned char) *rd)) {
2931 rd++;
2932 }
2933
2934 if (rd >= buffer_end) {
2935 break;
2936 }
2937
2938 // Remember this is where we found the head of the token.
2939 opt_hd = wrt;
2940
2941 // Tokens are strings of non white space characters separated
2942 // by one or more white spaces.
2943 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
2944 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2945 int quote = *rd; // matching quote to look for
2946 rd++; // don't copy open quote
2947 while (rd < buffer_end && *rd != quote) {
2948 // include everything (even spaces)
2949 // up until the close quote
2950 *wrt++ = *rd++; // copy to option string
2951 }
2952
2953 if (rd < buffer_end) {
2954 rd++; // don't copy close quote
2955 } else {
2956 // did not see closing quote
2957 jio_fprintf(defaultStream::error_stream(),
2958 "Unmatched quote in %s\n", name);
2959 return JNI_ERR;
2960 }
2961 } else {
2962 *wrt++ = *rd++; // copy to option string
2963 }
2964 }
2965
2966 // steal a white space character and set it to null
2967 *wrt++ = '\0';
2968 // We now have a complete token
2969
2970 JavaVMOption option;
2971 option.optionString = opt_hd;
2972 option.extraInfo = nullptr;
2973
2974 options.append(option); // Fill in option
2975
2976 rd++; // Advance to next character
2977 }
2978
2979 // Fill out JavaVMInitArgs structure.
2980 return vm_args->set_args(&options);
2981 }
2982
2983 #ifndef PRODUCT
2984 // Determine whether LogVMOutput should be implicitly turned on.
2985 static bool use_vm_log() {
2986 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
2987 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
2988 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
2989 PrintAssembly || TraceDeoptimization ||
2990 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
2991 return true;
2992 }
2993
2994 #ifdef COMPILER1
2995 if (PrintC1Statistics) {
2996 return true;
2997 }
2998 #endif // COMPILER1
2999
3000 #ifdef COMPILER2
3001 if (PrintOptoAssembly || PrintOptoStatistics) {
3002 return true;
3003 }
3004 #endif // COMPILER2
3005
3006 return false;
3007 }
3008
3009 #endif // PRODUCT
3010
3011 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3012 for (int index = 0; index < args->nOptions; index++) {
3013 const JavaVMOption* option = args->options + index;
3014 const char* tail;
3015 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3016 return true;
3017 }
3018 }
3019 return false;
3020 }
3021
3022 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3023 const char* vm_options_file,
3024 const int vm_options_file_pos,
3025 ScopedVMInitArgs* vm_options_file_args,
3026 ScopedVMInitArgs* args_out) {
3027 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3028 if (code != JNI_OK) {
3029 return code;
3030 }
3031
3032 if (vm_options_file_args->get()->nOptions < 1) {
3033 return JNI_OK;
3034 }
3035
3036 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3037 jio_fprintf(defaultStream::error_stream(),
3038 "A VM options file may not refer to a VM options file. "
3039 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3040 "options file '%s' in options container '%s' is an error.\n",
3041 vm_options_file_args->vm_options_file_arg(),
3042 vm_options_file_args->container_name());
3043 return JNI_EINVAL;
3044 }
3045
3046 return args_out->insert(args, vm_options_file_args->get(),
3047 vm_options_file_pos);
3048 }
3049
3050 // Expand -XX:VMOptionsFile found in args_in as needed.
3051 // mod_args and args_out parameters may return values as needed.
3052 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3053 ScopedVMInitArgs* mod_args,
3054 JavaVMInitArgs** args_out) {
3055 jint code = match_special_option_and_act(args_in, mod_args);
3056 if (code != JNI_OK) {
3057 return code;
3058 }
3059
3060 if (mod_args->is_set()) {
3061 // args_in contains -XX:VMOptionsFile and mod_args contains the
3062 // original options from args_in along with the options expanded
3063 // from the VMOptionsFile. Return a short-hand to the caller.
3064 *args_out = mod_args->get();
3065 } else {
3066 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3067 }
3068 return JNI_OK;
3069 }
3070
3071 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3072 ScopedVMInitArgs* args_out) {
3073 // Remaining part of option string
3074 const char* tail;
3075 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3076
3077 for (int index = 0; index < args->nOptions; index++) {
3078 const JavaVMOption* option = args->options + index;
3079 if (match_option(option, "-XX:Flags=", &tail)) {
3080 Arguments::set_jvm_flags_file(tail);
3081 continue;
3082 }
3083 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3084 if (vm_options_file_args.found_vm_options_file_arg()) {
3085 jio_fprintf(defaultStream::error_stream(),
3086 "The option '%s' is already specified in the options "
3087 "container '%s' so the specification of '%s' in the "
3088 "same options container is an error.\n",
3089 vm_options_file_args.vm_options_file_arg(),
3090 vm_options_file_args.container_name(),
3091 option->optionString);
3092 return JNI_EINVAL;
3093 }
3094 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3095 // If there's a VMOptionsFile, parse that
3096 jint code = insert_vm_options_file(args, tail, index,
3097 &vm_options_file_args, args_out);
3098 if (code != JNI_OK) {
3099 return code;
3100 }
3101 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3102 if (args_out->is_set()) {
3103 // The VMOptions file inserted some options so switch 'args'
3104 // to the new set of options, and continue processing which
3105 // preserves "last option wins" semantics.
3106 args = args_out->get();
3107 // The first option from the VMOptionsFile replaces the
3108 // current option. So we back track to process the
3109 // replacement option.
3110 index--;
3111 }
3112 continue;
3113 }
3114 if (match_option(option, "-XX:+PrintVMOptions")) {
3115 PrintVMOptions = true;
3116 continue;
3117 }
3118 if (match_option(option, "-XX:-PrintVMOptions")) {
3119 PrintVMOptions = false;
3120 continue;
3121 }
3122 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3123 IgnoreUnrecognizedVMOptions = true;
3124 continue;
3125 }
3126 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3127 IgnoreUnrecognizedVMOptions = false;
3128 continue;
3129 }
3130 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3131 JVMFlag::printFlags(tty, false);
3132 vm_exit(0);
3133 }
3134
3135 #ifndef PRODUCT
3136 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3137 JVMFlag::printFlags(tty, true);
3138 vm_exit(0);
3139 }
3140 #endif
3141 }
3142 return JNI_OK;
3143 }
3144
3145 static void print_options(const JavaVMInitArgs *args) {
3146 const char* tail;
3147 for (int index = 0; index < args->nOptions; index++) {
3148 const JavaVMOption *option = args->options + index;
3149 if (match_option(option, "-XX:", &tail)) {
3150 logOption(tail);
3151 }
3152 }
3153 }
3154
3155 bool Arguments::handle_deprecated_print_gc_flags() {
3156 if (PrintGC) {
3157 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3158 }
3159 if (PrintGCDetails) {
3160 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3161 }
3162
3163 if (_legacyGCLogging.lastFlag == 2) {
3164 // -Xloggc was used to specify a filename
3165 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3166
3167 LogTarget(Error, logging) target;
3168 LogStream errstream(target);
3169 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3170 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3171 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3172 }
3173 return true;
3174 }
3175
3176 static void apply_debugger_ergo() {
3177 #ifdef ASSERT
3178 if (ReplayCompiles) {
3179 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3180 }
3181
3182 if (UseDebuggerErgo) {
3183 // Turn on sub-flags
3184 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3185 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3186 }
3187
3188 if (UseDebuggerErgo2) {
3189 // Debugging with limited number of CPUs
3190 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3191 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3192 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3193 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3194 }
3195 #endif // ASSERT
3196 }
3197
3198 // Parse entry point called from JNI_CreateJavaVM
3199
3200 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3201 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3202 JVMFlag::check_all_flag_declarations();
3203
3204 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3205 const char* hotspotrc = ".hotspotrc";
3206 bool settings_file_specified = false;
3207 bool needs_hotspotrc_warning = false;
3208 ScopedVMInitArgs initial_vm_options_args("");
3209 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3210 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3211 ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'");
3212
3213 // Pointers to current working set of containers
3214 JavaVMInitArgs* cur_cmd_args;
3215 JavaVMInitArgs* cur_vm_options_args;
3216 JavaVMInitArgs* cur_java_options_args;
3217 JavaVMInitArgs* cur_java_tool_options_args;
3218 JavaVMInitArgs* cur_jdk_aot_vm_options_args;
3219
3220 // Containers for modified/expanded options
3221 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3222 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3223 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3224 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3225 ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'");
3226
3227 GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args;
3228
3229 jint code =
3230 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3231 if (code != JNI_OK) {
3232 return code;
3233 }
3234
3235 // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM.
3236 // This is an undocumented feature.
3237 code = parse_java_options_environment_variable(&initial_java_options_args);
3238 if (code != JNI_OK) {
3239 return code;
3240 }
3241
3242 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3243 char *vmoptions = ClassLoader::lookup_vm_options();
3244 if (vmoptions != nullptr) {
3245 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3246 FREE_C_HEAP_ARRAY(vmoptions);
3247 if (code != JNI_OK) {
3248 return code;
3249 }
3250 }
3251
3252 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3253 &mod_java_tool_options_args,
3254 &cur_java_tool_options_args);
3255 if (code != JNI_OK) {
3256 return code;
3257 }
3258
3259 code = expand_vm_options_as_needed(initial_cmd_args,
3260 &mod_cmd_args,
3261 &cur_cmd_args);
3262 if (code != JNI_OK) {
3263 return code;
3264 }
3265
3266 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3267 &mod_java_options_args,
3268 &cur_java_options_args);
3269 if (code != JNI_OK) {
3270 return code;
3271 }
3272
3273 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3274 &mod_vm_options_args,
3275 &cur_vm_options_args);
3276 if (code != JNI_OK) {
3277 return code;
3278 }
3279
3280 const char* flags_file = Arguments::get_jvm_flags_file();
3281 settings_file_specified = (flags_file != nullptr);
3282
3283 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags.
3284 if (settings_file_specified) {
3285 if (!process_settings_file(flags_file, true,
3286 IgnoreUnrecognizedVMOptions)) {
3287 return JNI_EINVAL;
3288 }
3289 } else {
3290 #ifdef ASSERT
3291 // Parse default .hotspotrc settings file
3292 if (!process_settings_file(".hotspotrc", false,
3293 IgnoreUnrecognizedVMOptions)) {
3294 return JNI_EINVAL;
3295 }
3296 #else
3297 struct stat buf;
3298 if (os::stat(hotspotrc, &buf) == 0) {
3299 needs_hotspotrc_warning = true;
3300 }
3301 #endif
3302 }
3303
3304 // The settings in the args are applied in this order to the the JVM global flags.
3305 // For historical reasons, the order is DIFFERENT than the scanning order of
3306 // the above expand_vm_options_as_needed() calls.
3307 all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE});
3308 all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR});
3309 all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE});
3310 all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR});
3311
3312 // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all
3313 // the options that have been gathered above.
3314 code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args);
3315 if (code != JNI_OK) {
3316 return code;
3317 }
3318 code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(),
3319 &mod_jdk_aot_vm_options_args,
3320 &cur_jdk_aot_vm_options_args);
3321 if (code != JNI_OK) {
3322 return code;
3323 }
3324
3325 for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) {
3326 JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index;
3327 const char* optionString = option->optionString;
3328 if (strstr(optionString, "-XX:AOTMode=") == optionString &&
3329 strcmp(optionString, "-XX:AOTMode=create") != 0) {
3330 jio_fprintf(defaultStream::error_stream(),
3331 "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString);
3332 return JNI_ERR;
3333 }
3334 }
3335
3336 all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR});
3337
3338 if (IgnoreUnrecognizedVMOptions) {
3339 // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of
3340 // the JDK so it shouldn't have bad options.
3341 cur_cmd_args->ignoreUnrecognized = true;
3342 cur_java_tool_options_args->ignoreUnrecognized = true;
3343 cur_java_options_args->ignoreUnrecognized = true;
3344 cur_jdk_aot_vm_options_args->ignoreUnrecognized = true;
3345 }
3346
3347 if (PrintVMOptions) {
3348 // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed.
3349 print_options(cur_java_tool_options_args);
3350 print_options(cur_cmd_args);
3351 print_options(cur_java_options_args);
3352 print_options(cur_jdk_aot_vm_options_args);
3353 }
3354
3355 // Apply the settings in these args to the JVM global flags.
3356 jint result = parse_vm_init_args(&all_args);
3357
3358 if (result != JNI_OK) {
3359 return result;
3360 }
3361
3362 // Delay warning until here so that we've had a chance to process
3363 // the -XX:-PrintWarnings flag
3364 if (needs_hotspotrc_warning) {
3365 warning("%s file is present but has been ignored. "
3366 "Run with -XX:Flags=%s to load the file.",
3367 hotspotrc, hotspotrc);
3368 }
3369
3370 if (needs_module_property_warning) {
3371 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3372 " names that are reserved for internal use.");
3373 }
3374
3375 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3376 UNSUPPORTED_OPTION(UseLargePages);
3377 #endif
3378
3379 #if defined(AIX)
3380 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3381 #endif
3382
3383 #ifndef PRODUCT
3384 if (TraceBytecodesAt != 0) {
3385 TraceBytecodes = true;
3386 }
3387 #endif // PRODUCT
3388
3389 if (ScavengeRootsInCode == 0) {
3390 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3391 warning("Forcing ScavengeRootsInCode non-zero");
3392 }
3393 ScavengeRootsInCode = 1;
3394 }
3395
3396 if (!handle_deprecated_print_gc_flags()) {
3397 return JNI_EINVAL;
3398 }
3399
3400 // Set object alignment values.
3401 set_object_alignment();
3402
3403 #if !INCLUDE_CDS
3404 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3405 jio_fprintf(defaultStream::error_stream(),
3406 "Shared spaces are not supported in this VM\n");
3407 return JNI_ERR;
3408 }
3409 if (DumpLoadedClassList != nullptr) {
3410 jio_fprintf(defaultStream::error_stream(),
3411 "DumpLoadedClassList is not supported in this VM\n");
3412 return JNI_ERR;
3413 }
3414 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3415 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) {
3416 warning("Shared spaces are not supported in this VM");
3417 UseSharedSpaces = false;
3418 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3419 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot));
3420 }
3421 no_shared_spaces("CDS Disabled");
3422 #endif // INCLUDE_CDS
3423
3424 // Verify NMT arguments
3425 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3426 if (lvl == NMT_unknown) {
3427 jio_fprintf(defaultStream::error_stream(),
3428 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3429 return JNI_ERR;
3430 }
3431 if (PrintNMTStatistics && lvl == NMT_off) {
3432 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3433 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3434 }
3435
3436 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3437 if (trace_dependencies && VerifyDependencies) {
3438 warning("dependency logging results may be inflated by VerifyDependencies");
3439 }
3440
3441 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3442 log_is_enabled(Info, class, load, cause);
3443 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3444 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3445 }
3446
3447 apply_debugger_ergo();
3448
3449 // The VMThread needs to stop now and then to execute these debug options.
3450 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3451 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3452 }
3453
3454 if (log_is_enabled(Info, arguments)) {
3455 LogStream st(Log(arguments)::info());
3456 Arguments::print_on(&st);
3457 }
3458
3459 return JNI_OK;
3460 }
3461
3462 void Arguments::set_compact_headers_flags() {
3463 #ifdef _LP64
3464 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3465 if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3466 warning("-UseObjectMonitorTable is incompatible with +UseCompactObjectHeaders; ignoring -UseObjectMonitorTable");
3467 }
3468 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3469 }
3470 #endif
3471 }
3472
3473 jint Arguments::apply_ergo() {
3474 // Set flags based on ergonomics.
3475 jint result = set_ergonomics_flags();
3476 if (result != JNI_OK) return result;
3477
3478 // Set heap size based on available physical memory
3479 GCConfig::arguments()->set_heap_size();
3480
3481 GCConfig::arguments()->initialize();
3482
3483 set_compact_headers_flags();
3484
3485 CompressedKlassPointers::pre_initialize();
3486
3487 CDSConfig::ergo_initialize();
3488
3489 // Initialize Metaspace flags and alignments
3490 Metaspace::ergo_initialize();
3491
3492 if (!StringDedup::ergo_initialize()) {
3493 return JNI_EINVAL;
3494 }
3495
3496 // Set compiler flags after GC is selected and GC specific
3497 // flags (LoopStripMiningIter) are set.
3498 CompilerConfig::ergo_initialize();
3499
3500 // Set bytecode rewriting flags
3501 set_bytecode_flags();
3502
3503 // Set flags if aggressive optimization flags are enabled
3504 jint code = set_aggressive_opts_flags();
3505 if (code != JNI_OK) {
3506 return code;
3507 }
3508
3509 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3510 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3511 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3512 warning("UseSecondarySupersTable is not supported");
3513 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3514 }
3515 if (!UseSecondarySupersTable) {
3516 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3517 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3518 }
3519
3520 #ifdef ZERO
3521 // Clear flags not supported on zero.
3522 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3523 #endif // ZERO
3524
3525 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3526 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3527 DebugNonSafepoints = true;
3528 }
3529
3530 // Treat the odd case where local verification is enabled but remote
3531 // verification is not as if both were enabled.
3532 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3533 log_info(verification)("Turning on remote verification because local verification is on");
3534 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3535 }
3536 if (!is_valhalla_enabled()) {
3537 #define WARN_IF_NOT_DEFAULT_FLAG(flag) \
3538 if (!FLAG_IS_DEFAULT(flag)) { \
3539 warning("Preview-specific flag \"%s\" has no effect when --enable-preview is not specified.", #flag); \
3540 }
3541
3542 #define DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(flag) \
3543 WARN_IF_NOT_DEFAULT_FLAG(flag) \
3544 FLAG_SET_DEFAULT(flag, false);
3545
3546 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(InlineTypePassFieldsAsArgs);
3547 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(InlineTypeReturnedAsFields);
3548 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseArrayFlattening);
3549 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseFieldFlattening);
3550 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseNullFreeNonAtomicValueFlattening);
3551 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseNullableAtomicValueFlattening);
3552 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseNullFreeAtomicValueFlattening);
3553 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseNullableNonAtomicValueFlattening);
3554 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseAcmpFastPath);
3555 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(PrintInlineLayout);
3556 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(PrintFlatArrayLayout);
3557 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(IgnoreAssertUnsetFields);
3558 WARN_IF_NOT_DEFAULT_FLAG(FlatArrayElementMaxOops);
3559 WARN_IF_NOT_DEFAULT_FLAG(ForceNonTearable);
3560 #ifdef ASSERT
3561 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(StressCallingConvention);
3562 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(PreloadClasses);
3563 WARN_IF_NOT_DEFAULT_FLAG(PrintInlineKlassFields);
3564 #endif
3565 #ifdef COMPILER1
3566 DEBUG_ONLY(DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(C1UseDelayedFlattenedFieldReads);)
3567 #endif
3568 #ifdef COMPILER2
3569 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseArrayLoadStoreProfile);
3570 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseACmpProfile);
3571 #endif
3572 #undef DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT
3573 #undef WARN_IF_NOT_DEFAULT_FLAG
3574 } else {
3575 #define DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING(flag, fallback) \
3576 if (!FLAG_IS_DEFAULT(flag) && !UseArrayFlattening && !UseFieldFlattening) { \
3577 warning("Flattening flag \"%s\" has no effect when all flattening modes are disabled.", #flag); \
3578 FLAG_SET_DEFAULT(flag, fallback); \
3579 }
3580
3581 DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING(UseNullFreeNonAtomicValueFlattening, false);
3582 DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING(UseNullableAtomicValueFlattening, false);
3583 DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING(UseNullFreeAtomicValueFlattening, false);
3584 DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING(UseNullableNonAtomicValueFlattening, false);
3585 DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING(FlatArrayElementMaxOops, 0);
3586 DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING(FlatteningBudget, 0);
3587 #undef DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING
3588 if (is_interpreter_only() && !CDSConfig::is_dumping_archive() && !UseSharedSpaces) {
3589 // Disable calling convention optimizations if inline types are not supported.
3590 // Also these aren't useful in -Xint. However, don't disable them when dumping or using
3591 // the CDS archive, as the values must match between dumptime and runtime.
3592 FLAG_SET_DEFAULT(InlineTypePassFieldsAsArgs, false);
3593 FLAG_SET_DEFAULT(InlineTypeReturnedAsFields, false);
3594 }
3595 if (!UseNullFreeNonAtomicValueFlattening &&
3596 !UseNullableAtomicValueFlattening &&
3597 !UseNullFreeAtomicValueFlattening &&
3598 !UseNullableNonAtomicValueFlattening) {
3599 // Flattening is disabled
3600 FLAG_SET_DEFAULT(UseArrayFlattening, false);
3601 FLAG_SET_DEFAULT(UseFieldFlattening, false);
3602 }
3603 }
3604
3605 #ifndef PRODUCT
3606 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3607 if (use_vm_log()) {
3608 LogVMOutput = true;
3609 }
3610 }
3611 #endif // PRODUCT
3612
3613 if (PrintCommandLineFlags) {
3614 JVMFlag::printSetFlags(tty);
3615 }
3616
3617 #ifdef COMPILER2
3618 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3619 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3620 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3621 }
3622 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3623
3624 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3625 if (!EnableVectorReboxing) {
3626 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3627 } else {
3628 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3629 }
3630 }
3631 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3632 }
3633
3634 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
3635 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
3636 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
3637 }
3638 #endif // COMPILER2
3639
3640 if (log_is_enabled(Info, perf, class, link)) {
3641 if (!UsePerfData) {
3642 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3643 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
3644 assert(!log_is_enabled(Info, perf, class, link), "sanity");
3645 }
3646 }
3647
3648 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3649 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3650 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3651 }
3652 }
3653 return JNI_OK;
3654 }
3655
3656 jint Arguments::adjust_after_os() {
3657 if (UseNUMA) {
3658 if (UseParallelGC) {
3659 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3660 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3661 }
3662 }
3663 }
3664 return JNI_OK;
3665 }
3666
3667 int Arguments::PropertyList_count(SystemProperty* pl) {
3668 int count = 0;
3669 while(pl != nullptr) {
3670 count++;
3671 pl = pl->next();
3672 }
3673 return count;
3674 }
3675
3676 // Return the number of readable properties.
3677 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3678 int count = 0;
3679 while(pl != nullptr) {
3680 if (pl->readable()) {
3681 count++;
3682 }
3683 pl = pl->next();
3684 }
3685 return count;
3686 }
3687
3688 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3689 assert(key != nullptr, "just checking");
3690 SystemProperty* prop;
3691 for (prop = pl; prop != nullptr; prop = prop->next()) {
3692 if (strcmp(key, prop->key()) == 0) return prop->value();
3693 }
3694 return nullptr;
3695 }
3696
3697 // Return the value of the requested property provided that it is a readable property.
3698 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3699 assert(key != nullptr, "just checking");
3700 SystemProperty* prop;
3701 // Return the property value if the keys match and the property is not internal or
3702 // it's the special internal property "jdk.boot.class.path.append".
3703 for (prop = pl; prop != nullptr; prop = prop->next()) {
3704 if (strcmp(key, prop->key()) == 0) {
3705 if (!prop->internal()) {
3706 return prop->value();
3707 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3708 return prop->value();
3709 } else {
3710 // Property is internal and not jdk.boot.class.path.append so return null.
3711 return nullptr;
3712 }
3713 }
3714 }
3715 return nullptr;
3716 }
3717
3718 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3719 SystemProperty* p = *plist;
3720 if (p == nullptr) {
3721 *plist = new_p;
3722 } else {
3723 while (p->next() != nullptr) {
3724 p = p->next();
3725 }
3726 p->set_next(new_p);
3727 }
3728 }
3729
3730 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3731 bool writeable, bool internal) {
3732 if (plist == nullptr)
3733 return;
3734
3735 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3736 PropertyList_add(plist, new_p);
3737 }
3738
3739 void Arguments::PropertyList_add(SystemProperty *element) {
3740 PropertyList_add(&_system_properties, element);
3741 }
3742
3743 // This add maintains unique property key in the list.
3744 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3745 PropertyAppendable append, PropertyWriteable writeable,
3746 PropertyInternal internal) {
3747 if (plist == nullptr)
3748 return;
3749
3750 // If property key exists and is writeable, then update with new value.
3751 // Trying to update a non-writeable property is silently ignored.
3752 SystemProperty* prop;
3753 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3754 if (strcmp(k, prop->key()) == 0) {
3755 if (append == AppendProperty) {
3756 prop->append_writeable_value(v);
3757 } else {
3758 prop->set_writeable_value(v);
3759 }
3760 return;
3761 }
3762 }
3763
3764 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3765 }
3766
3767 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3768 // Returns true if all of the source pointed by src has been copied over to
3769 // the destination buffer pointed by buf. Otherwise, returns false.
3770 // Notes:
3771 // 1. If the length (buflen) of the destination buffer excluding the
3772 // null terminator character is not long enough for holding the expanded
3773 // pid characters, it also returns false instead of returning the partially
3774 // expanded one.
3775 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3776 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3777 char* buf, size_t buflen) {
3778 const char* p = src;
3779 char* b = buf;
3780 const char* src_end = &src[srclen];
3781 char* buf_end = &buf[buflen - 1];
3782
3783 while (p < src_end && b < buf_end) {
3784 if (*p == '%') {
3785 switch (*(++p)) {
3786 case '%': // "%%" ==> "%"
3787 *b++ = *p++;
3788 break;
3789 case 'p': { // "%p" ==> current process id
3790 // buf_end points to the character before the last character so
3791 // that we could write '\0' to the end of the buffer.
3792 size_t buf_sz = buf_end - b + 1;
3793 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3794
3795 // if jio_snprintf fails or the buffer is not long enough to hold
3796 // the expanded pid, returns false.
3797 if (ret < 0 || ret >= (int)buf_sz) {
3798 return false;
3799 } else {
3800 b += ret;
3801 assert(*b == '\0', "fail in copy_expand_pid");
3802 if (p == src_end && b == buf_end + 1) {
3803 // reach the end of the buffer.
3804 return true;
3805 }
3806 }
3807 p++;
3808 break;
3809 }
3810 default :
3811 *b++ = '%';
3812 }
3813 } else {
3814 *b++ = *p++;
3815 }
3816 }
3817 *b = '\0';
3818 return (p == src_end); // return false if not all of the source was copied
3819 }