1 /*
2 * Copyright (c) 1997, 2026, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/aotLogging.hpp"
26 #include "cds/cds_globals.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/javaAssertions.hpp"
30 #include "classfile/moduleEntry.hpp"
31 #include "classfile/stringTable.hpp"
32 #include "classfile/symbolTable.hpp"
33 #include "compiler/compilerDefinitions.hpp"
34 #include "cppstdlib/limits.hpp"
35 #include "gc/shared/gc_globals.hpp"
36 #include "gc/shared/gcArguments.hpp"
37 #include "gc/shared/gcConfig.hpp"
38 #include "gc/shared/stringdedup/stringDedup.hpp"
39 #include "gc/shared/tlab_globals.hpp"
40 #include "jvm.h"
41 #include "logging/log.hpp"
42 #include "logging/logConfiguration.hpp"
43 #include "logging/logStream.hpp"
44 #include "logging/logTag.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "nmt/nmtCommon.hpp"
47 #include "oops/compressedKlass.hpp"
48 #include "oops/instanceKlass.hpp"
49 #include "oops/objLayout.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "prims/jvmtiAgentList.hpp"
52 #include "prims/jvmtiExport.hpp"
53 #include "runtime/arguments.hpp"
54 #include "runtime/flags/jvmFlag.hpp"
55 #include "runtime/flags/jvmFlagAccess.hpp"
56 #include "runtime/flags/jvmFlagLimit.hpp"
57 #include "runtime/globals_extension.hpp"
58 #include "runtime/java.hpp"
59 #include "runtime/os.hpp"
60 #include "runtime/safepoint.hpp"
61 #include "runtime/safepointMechanism.hpp"
62 #include "runtime/synchronizer.hpp"
63 #include "runtime/vm_version.hpp"
64 #include "services/management.hpp"
65 #include "utilities/align.hpp"
66 #include "utilities/debug.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/macros.hpp"
69 #include "utilities/parseInteger.hpp"
70 #include "utilities/powerOfTwo.hpp"
71 #include "utilities/stringUtils.hpp"
72 #include "utilities/systemMemoryBarrier.hpp"
73 #if INCLUDE_JFR
74 #include "jfr/jfr.hpp"
75 #endif
76
77 static const char _default_java_launcher[] = "generic";
78
79 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
80
81 char* Arguments::_jvm_flags_file = nullptr;
82 char** Arguments::_jvm_flags_array = nullptr;
83 int Arguments::_num_jvm_flags = 0;
84 char** Arguments::_jvm_args_array = nullptr;
85 int Arguments::_num_jvm_args = 0;
86 unsigned int Arguments::_addmods_count = 0;
87 char* Arguments::_java_command = nullptr;
88 SystemProperty* Arguments::_system_properties = nullptr;
89 size_t Arguments::_conservative_max_heap_alignment = 0;
90 Arguments::Mode Arguments::_mode = _mixed;
91 const char* Arguments::_java_vendor_url_bug = nullptr;
92 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
93 bool Arguments::_executing_unit_tests = false;
94
95 // These parameters are reset in method parse_vm_init_args()
96 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
97 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
98 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
99 bool Arguments::_ClipInlining = ClipInlining;
100 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
101
102 bool Arguments::_enable_preview = false;
103 bool Arguments::_has_jdwp_agent = false;
104
105 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
106
107 // These are not set by the JDK's built-in launchers, but they can be set by
108 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
109 // JavaVMOption in jni.h.
110 abort_hook_t Arguments::_abort_hook = nullptr;
111 exit_hook_t Arguments::_exit_hook = nullptr;
112 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
113
114
115 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
116 SystemProperty *Arguments::_java_library_path = nullptr;
117 SystemProperty *Arguments::_java_home = nullptr;
118 SystemProperty *Arguments::_java_class_path = nullptr;
119 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
120 SystemProperty *Arguments::_vm_info = nullptr;
121
122 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
123 PathString *Arguments::_boot_class_path = nullptr;
124 bool Arguments::_has_jimage = false;
125
126 char* Arguments::_ext_dirs = nullptr;
127
128 // True if -Xshare:auto option was specified.
129 static bool xshare_auto_cmd_line = false;
130
131 // True if -Xint/-Xmixed/-Xcomp were specified
132 static bool mode_flag_cmd_line = false;
133
134 struct VMInitArgsGroup {
135 const JavaVMInitArgs* _args;
136 JVMFlagOrigin _origin;
137 };
138
139 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
140 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
141 if (new_value == nullptr) {
142 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
143 return false;
144 }
145 if (_value != nullptr) {
146 FreeHeap(_value);
147 }
148 _value = new_value;
149 strcpy(_value, value);
150 return true;
151 }
152
153 void PathString::append_value(const char *value) {
154 char *sp;
155 size_t len = 0;
156 if (value != nullptr) {
157 len = strlen(value);
158 if (_value != nullptr) {
159 len += strlen(_value);
160 }
161 sp = AllocateHeap(len+2, mtArguments);
162 assert(sp != nullptr, "Unable to allocate space for new append path value");
163 if (sp != nullptr) {
164 if (_value != nullptr) {
165 strcpy(sp, _value);
166 strcat(sp, os::path_separator());
167 strcat(sp, value);
168 FreeHeap(_value);
169 } else {
170 strcpy(sp, value);
171 }
172 _value = sp;
173 }
174 }
175 }
176
177 PathString::PathString(const char* value) {
178 if (value == nullptr) {
179 _value = nullptr;
180 } else {
181 _value = AllocateHeap(strlen(value)+1, mtArguments);
182 strcpy(_value, value);
183 }
184 }
185
186 PathString::~PathString() {
187 if (_value != nullptr) {
188 FreeHeap(_value);
189 _value = nullptr;
190 }
191 }
192
193 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
194 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
195 size_t len = strlen(module_name) + 1;
196 _module_name = AllocateHeap(len, mtInternal);
197 strncpy(_module_name, module_name, len); // copy the trailing null
198 _path = new PathString(path);
199 }
200
201 ModulePatchPath::~ModulePatchPath() {
202 if (_module_name != nullptr) {
203 FreeHeap(_module_name);
204 _module_name = nullptr;
205 }
206 if (_path != nullptr) {
207 delete _path;
208 _path = nullptr;
209 }
210 }
211
212 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
213 if (key == nullptr) {
214 _key = nullptr;
215 } else {
216 _key = AllocateHeap(strlen(key)+1, mtArguments);
217 strcpy(_key, key);
218 }
219 _next = nullptr;
220 _internal = internal;
221 _writeable = writeable;
222 }
223
224 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
225 // part of the option string.
226 static bool match_option(const JavaVMOption *option, const char* name,
227 const char** tail) {
228 size_t len = strlen(name);
229 if (strncmp(option->optionString, name, len) == 0) {
230 *tail = option->optionString + len;
231 return true;
232 } else {
233 return false;
234 }
235 }
236
237 // Check if 'option' matches 'name'. No "tail" is allowed.
238 static bool match_option(const JavaVMOption *option, const char* name) {
239 const char* tail = nullptr;
240 bool result = match_option(option, name, &tail);
241 if (tail != nullptr && *tail == '\0') {
242 return result;
243 } else {
244 return false;
245 }
246 }
247
248 // Return true if any of the strings in null-terminated array 'names' matches.
249 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
250 // the option must match exactly.
251 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
252 bool tail_allowed) {
253 for (/* empty */; *names != nullptr; ++names) {
254 if (match_option(option, *names, tail)) {
255 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
256 return true;
257 }
258 }
259 }
260 return false;
261 }
262
263 #if INCLUDE_JFR
264 static bool _has_jfr_option = false; // is using JFR
265
266 // return true on failure
267 static bool match_jfr_option(const JavaVMOption** option) {
268 assert((*option)->optionString != nullptr, "invariant");
269 char* tail = nullptr;
270 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
271 _has_jfr_option = true;
272 return Jfr::on_start_flight_recording_option(option, tail);
273 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
274 _has_jfr_option = true;
275 return Jfr::on_flight_recorder_option(option, tail);
276 }
277 return false;
278 }
279
280 bool Arguments::has_jfr_option() {
281 return _has_jfr_option;
282 }
283 #endif
284
285 static void logOption(const char* opt) {
286 if (PrintVMOptions) {
287 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
288 }
289 }
290
291 bool needs_module_property_warning = false;
292
293 #define MODULE_PROPERTY_PREFIX "jdk.module."
294 #define MODULE_PROPERTY_PREFIX_LEN 11
295 #define ADDEXPORTS "addexports"
296 #define ADDEXPORTS_LEN 10
297 #define ADDREADS "addreads"
298 #define ADDREADS_LEN 8
299 #define ADDOPENS "addopens"
300 #define ADDOPENS_LEN 8
301 #define PATCH "patch"
302 #define PATCH_LEN 5
303 #define ADDMODS "addmods"
304 #define ADDMODS_LEN 7
305 #define LIMITMODS "limitmods"
306 #define LIMITMODS_LEN 9
307 #define PATH "path"
308 #define PATH_LEN 4
309 #define UPGRADE_PATH "upgrade.path"
310 #define UPGRADE_PATH_LEN 12
311 #define ENABLE_NATIVE_ACCESS "enable.native.access"
312 #define ENABLE_NATIVE_ACCESS_LEN 20
313 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
314 #define ILLEGAL_NATIVE_ACCESS_LEN 21
315 #define ENABLE_FINAL_FIELD_MUTATION "enable.final.field.mutation"
316 #define ENABLE_FINAL_FIELD_MUTATION_LEN 27
317 #define ILLEGAL_FINAL_FIELD_MUTATION "illegal.final.field.mutation"
318 #define ILLEGAL_FINAL_FIELD_MUTATION_LEN 28
319
320 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
321 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
322 return ((strncmp(option, property, len) == 0) &&
323 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
324 }
325
326 // Return true if property starts with "jdk.module." and its ensuing chars match
327 // any of the reserved module properties.
328 // property should be passed without the leading "-D".
329 bool Arguments::is_internal_module_property(const char* property) {
330 return internal_module_property_helper(property, false);
331 }
332
333 // Returns true if property is one of those recognized by is_internal_module_property() but
334 // is not supported by CDS archived full module graph.
335 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
336 return internal_module_property_helper(property, true);
337 }
338
339 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
340 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
341 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
342 if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
343 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
344 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
345 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN) ||
346 matches_property_suffix(property_suffix, ENABLE_FINAL_FIELD_MUTATION, ENABLE_FINAL_FIELD_MUTATION_LEN) ||
347 matches_property_suffix(property_suffix, ILLEGAL_FINAL_FIELD_MUTATION, ILLEGAL_FINAL_FIELD_MUTATION_LEN)) {
348 return true;
349 }
350
351 if (!check_for_cds) {
352 // CDS notes: these properties are supported by CDS archived full module graph.
353 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
354 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
355 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
356 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
357 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
358 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
359 return true;
360 }
361 }
362 }
363 return false;
364 }
365
366 // Process java launcher properties.
367 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
368 // See if sun.java.launcher is defined.
369 // Must do this before setting up other system properties,
370 // as some of them may depend on launcher type.
371 for (int index = 0; index < args->nOptions; index++) {
372 const JavaVMOption* option = args->options + index;
373 const char* tail;
374
375 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
376 process_java_launcher_argument(tail, option->extraInfo);
377 continue;
378 }
379 if (match_option(option, "-XX:+ExecutingUnitTests")) {
380 _executing_unit_tests = true;
381 continue;
382 }
383 }
384 }
385
386 // Initialize system properties key and value.
387 void Arguments::init_system_properties() {
388
389 // Set up _boot_class_path which is not a property but
390 // relies heavily on argument processing and the jdk.boot.class.path.append
391 // property. It is used to store the underlying boot class path.
392 _boot_class_path = new PathString(nullptr);
393
394 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
395 "Java Virtual Machine Specification", false));
396 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
397 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
398 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
399
400 // Initialize the vm.info now, but it will need updating after argument parsing.
401 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
402
403 // Following are JVMTI agent writable properties.
404 // Properties values are set to nullptr and they are
405 // os specific they are initialized in os::init_system_properties_values().
406 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
407 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
408 _java_home = new SystemProperty("java.home", nullptr, true);
409 _java_class_path = new SystemProperty("java.class.path", "", true);
410 // jdk.boot.class.path.append is a non-writeable, internal property.
411 // It can only be set by either:
412 // - -Xbootclasspath/a:
413 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
414 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
415
416 // Add to System Property list.
417 PropertyList_add(&_system_properties, _sun_boot_library_path);
418 PropertyList_add(&_system_properties, _java_library_path);
419 PropertyList_add(&_system_properties, _java_home);
420 PropertyList_add(&_system_properties, _java_class_path);
421 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
422 PropertyList_add(&_system_properties, _vm_info);
423
424 // Set OS specific system properties values
425 os::init_system_properties_values();
426 }
427
428 // Update/Initialize System properties after JDK version number is known
429 void Arguments::init_version_specific_system_properties() {
430 enum { bufsz = 16 };
431 char buffer[bufsz];
432 const char* spec_vendor = "Oracle Corporation";
433 uint32_t spec_version = JDK_Version::current().major_version();
434
435 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
436
437 PropertyList_add(&_system_properties,
438 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
439 PropertyList_add(&_system_properties,
440 new SystemProperty("java.vm.specification.version", buffer, false));
441 PropertyList_add(&_system_properties,
442 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
443 }
444
445 /*
446 * -XX argument processing:
447 *
448 * -XX arguments are defined in several places, such as:
449 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
450 * -XX arguments are parsed in parse_argument().
451 * -XX argument bounds checking is done in check_vm_args_consistency().
452 *
453 * Over time -XX arguments may change. There are mechanisms to handle common cases:
454 *
455 * ALIASED: An option that is simply another name for another option. This is often
456 * part of the process of deprecating a flag, but not all aliases need
457 * to be deprecated.
458 *
459 * Create an alias for an option by adding the old and new option names to the
460 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
461 *
462 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
463 * support may be removed in the future. Both regular and aliased options may be
464 * deprecated.
465 *
466 * Add a deprecation warning for an option (or alias) by adding an entry in the
467 * "special_jvm_flags" table and setting the "deprecated_in" field.
468 * Often an option "deprecated" in one major release will
469 * be made "obsolete" in the next. In this case the entry should also have its
470 * "obsolete_in" field set.
471 *
472 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
473 * on the command line. A warning is printed to let the user know that option might not
474 * be accepted in the future.
475 *
476 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
477 * table and setting the "obsolete_in" field.
478 *
479 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
480 * to the current JDK version. The system will flatly refuse to admit the existence of
481 * the flag. This allows a flag to die automatically over JDK releases.
482 *
483 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
484 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
485 * - Newly obsolete or expired deprecated options should have their global variable
486 * definitions removed (from globals.hpp, etc) and related implementations removed.
487 *
488 * Recommended approach for removing options:
489 *
490 * To remove options commonly used by customers (e.g. product -XX options), use
491 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
492 *
493 * To remove internal options (e.g. diagnostic, experimental, develop options), use
494 * a 2-step model adding major release numbers to the obsolete and expire columns.
495 *
496 * To change the name of an option, use the alias table as well as a 2-step
497 * model adding major release numbers to the deprecate and expire columns.
498 * Think twice about aliasing commonly used customer options.
499 *
500 * There are times when it is appropriate to leave a future release number as undefined.
501 *
502 * Tests: Aliases should be tested in VMAliasOptions.java.
503 * Deprecated options should be tested in VMDeprecatedOptions.java.
504 */
505
506 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
507 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
508 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
509 // the command-line as usual, but will issue a warning.
510 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
511 // the command-line, while issuing a warning and ignoring the flag value.
512 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
513 // existence of the flag.
514 //
515 // MANUAL CLEANUP ON JDK VERSION UPDATES:
516 // This table ensures that the handling of options will update automatically when the JDK
517 // version is incremented, but the source code needs to be cleanup up manually:
518 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
519 // variable should be removed, as well as users of the variable.
520 // - As "deprecated" options age into "obsolete" options, move the entry into the
521 // "Obsolete Flags" section of the table.
522 // - All expired options should be removed from the table.
523 static SpecialFlag const special_jvm_flags[] = {
524 // -------------- Deprecated Flags --------------
525 // --- Non-alias flags - sorted by obsolete_in then expired_in:
526 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
527 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
528 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
529 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
530 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
531 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
532 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
533 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
534 { "InitiatingHeapOccupancyPercent", JDK_Version::jdk(27), JDK_Version::jdk(28), JDK_Version::jdk(29) },
535 { "AlwaysCompileLoopMethods", JDK_Version::jdk(27), JDK_Version::jdk(28), JDK_Version::jdk(29) },
536
537 // -------------- Obsolete Flags - sorted by expired_in --------------
538
539 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
540 #if defined(AARCH64)
541 { "NearCpool", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
542 #endif
543 #ifdef _LP64
544 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(27), JDK_Version::undefined() },
545 #endif
546
547 { "PSChunkLargeArrays", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
548 { "ParallelRefProcEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
549 { "ParallelRefProcBalancingEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
550 { "MaxRAM", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
551 { "NewSizeThreadIncrease", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
552 { "NeverActAsServerClassMachine", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
553 { "AlwaysActAsServerClassMachine", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
554 { "UseXMMForArrayCopy", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
555 { "UseNewLongLShift", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
556 { "AggressiveHeap", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
557
558 {"ShenandoahAccelerationSamplePeriod", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
559 {"ShenandoahRateAccelerationSampleSize", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
560 {"ShenandoahMomentaryAllocationRateSpikeSampleSize", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
561 {"ShenandoahAdaptiveSampleFrequencyHz", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
562 {"ShenandoahAdaptiveSampleSizeSeconds", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
563 {"ShenandoahAdaptiveInitialSpikeThreshold",JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
564 {"ShenandoahAdaptiveDecayFactor", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
565
566 #ifdef ASSERT
567 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
568 #endif
569
570 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
571 // These entries will generate build errors. Their purpose is to test the macros.
572 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
573 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
574 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
575 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
576 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
577 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
578 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
579 #endif
580
581 { nullptr, JDK_Version(0), JDK_Version(0) }
582 };
583
584 // Flags that are aliases for other flags.
585 typedef struct {
586 const char* alias_name;
587 const char* real_name;
588 } AliasedFlag;
589
590 static AliasedFlag const aliased_jvm_flags[] = {
591 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
592 G1GC_ONLY({"InitiatingHeapOccupancyPercent" COMMA "G1IHOP" } COMMA)
593 { nullptr, nullptr}
594 };
595
596 // Return true if "v" is less than "other", where "other" may be "undefined".
597 static bool version_less_than(JDK_Version v, JDK_Version other) {
598 assert(!v.is_undefined(), "must be defined");
599 if (!other.is_undefined() && v.compare(other) >= 0) {
600 return false;
601 } else {
602 return true;
603 }
604 }
605
606 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
607 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
608 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
609 flag = special_jvm_flags[i];
610 return true;
611 }
612 }
613 return false;
614 }
615
616 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
617 assert(version != nullptr, "Must provide a version buffer");
618 SpecialFlag flag;
619 if (lookup_special_flag(flag_name, flag)) {
620 if (!flag.obsolete_in.is_undefined()) {
621 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
622 *version = flag.obsolete_in;
623 // This flag may have been marked for obsoletion in this version, but we may not
624 // have actually removed it yet. Rather than ignoring it as soon as we reach
625 // this version we allow some time for the removal to happen. So if the flag
626 // still actually exists we process it as normal, but issue an adjusted warning.
627 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
628 if (real_flag != nullptr) {
629 char version_str[256];
630 version->to_string(version_str, sizeof(version_str));
631 warning("Temporarily processing option %s; support is scheduled for removal in %s",
632 flag_name, version_str);
633 return false;
634 }
635 return true;
636 }
637 }
638 }
639 return false;
640 }
641
642 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
643 assert(version != nullptr, "Must provide a version buffer");
644 SpecialFlag flag;
645 if (lookup_special_flag(flag_name, flag)) {
646 if (!flag.deprecated_in.is_undefined()) {
647 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
648 version_less_than(JDK_Version::current(), flag.expired_in)) {
649 *version = flag.deprecated_in;
650 return 1;
651 } else {
652 return -1;
653 }
654 }
655 }
656 return 0;
657 }
658
659 const char* Arguments::real_flag_name(const char *flag_name) {
660 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
661 const AliasedFlag& flag_status = aliased_jvm_flags[i];
662 if (strcmp(flag_status.alias_name, flag_name) == 0) {
663 return flag_status.real_name;
664 }
665 }
666 return flag_name;
667 }
668
669 #ifdef ASSERT
670 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
671 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
672 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
673 return true;
674 }
675 }
676 return false;
677 }
678
679 // Verifies the correctness of the entries in the special_jvm_flags table.
680 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
681 // version being earlier than the deprecation version, then a warning is issued
682 // and verification fails - by returning false. If it is detected that the table
683 // is out of date, with respect to the current version, then ideally a warning is
684 // issued but verification does not fail. This allows the VM to operate when the
685 // version is first updated, without needing to update all the impacted flags at
686 // the same time. In practice we can't issue the warning immediately when the version
687 // is updated as it occurs for every test and some tests are not prepared to handle
688 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
689 // if the check_globals flag is true, and in addition allow a grace period and only
690 // check for stale flags when we hit build 25 (which is far enough into the 6 month
691 // release cycle that all flag updates should have been processed, whilst still
692 // leaving time to make the change before RDP2).
693 // We use a gtest to call this, passing true, so that we can detect stale flags before
694 // the end of the release cycle.
695
696 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
697
698 bool Arguments::verify_special_jvm_flags(bool check_globals) {
699 bool success = true;
700 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
701 const SpecialFlag& flag = special_jvm_flags[i];
702 if (lookup_special_flag(flag.name, i)) {
703 warning("Duplicate special flag declaration \"%s\"", flag.name);
704 success = false;
705 }
706 if (flag.deprecated_in.is_undefined() &&
707 flag.obsolete_in.is_undefined()) {
708 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
709 success = false;
710 }
711
712 if (!flag.deprecated_in.is_undefined()) {
713 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
714 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
715 success = false;
716 }
717
718 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
719 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
720 success = false;
721 }
722 }
723
724 if (!flag.obsolete_in.is_undefined()) {
725 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
726 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
727 success = false;
728 }
729
730 // if flag has become obsolete it should not have a "globals" flag defined anymore.
731 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
732 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
733 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
734 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
735 success = false;
736 }
737 }
738
739 } else if (!flag.expired_in.is_undefined()) {
740 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
741 success = false;
742 }
743
744 if (!flag.expired_in.is_undefined()) {
745 // if flag has become expired it should not have a "globals" flag defined anymore.
746 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
747 !version_less_than(JDK_Version::current(), flag.expired_in)) {
748 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
749 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
750 success = false;
751 }
752 }
753 }
754 }
755 return success;
756 }
757 #endif
758
759 bool Arguments::atojulong(const char *s, julong* result) {
760 return parse_integer(s, result);
761 }
762
763 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
764 if (size < min_size) return arg_too_small;
765 if (size > max_size) return arg_too_big;
766 return arg_in_range;
767 }
768
769 // Describe an argument out of range error
770 void Arguments::describe_range_error(ArgsRange errcode) {
771 switch(errcode) {
772 case arg_too_big:
773 jio_fprintf(defaultStream::error_stream(),
774 "The specified size exceeds the maximum "
775 "representable size.\n");
776 break;
777 case arg_too_small:
778 case arg_unreadable:
779 case arg_in_range:
780 // do nothing for now
781 break;
782 default:
783 ShouldNotReachHere();
784 }
785 }
786
787 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
788 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
789 return true;
790 } else {
791 return false;
792 }
793 }
794
795 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
796 // strtod allows leading whitespace, but our flag format does not.
797 if (*value == '\0' || isspace((unsigned char) *value)) {
798 return false;
799 }
800 char* end;
801 errno = 0;
802 double v = strtod(value, &end);
803 if ((errno != 0) || (*end != 0)) {
804 return false;
805 }
806 if (g_isnan(v) || !g_isfinite(v)) {
807 // Currently we cannot handle these special values.
808 return false;
809 }
810
811 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
812 return true;
813 }
814 return false;
815 }
816
817 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
818 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
819
820 if (flag->is_int()) {
821 int v;
822 if (parse_integer(value, &v)) {
823 result = JVMFlagAccess::set_int(flag, &v, origin);
824 }
825 } else if (flag->is_uint()) {
826 uint v;
827 if (parse_integer(value, &v)) {
828 result = JVMFlagAccess::set_uint(flag, &v, origin);
829 }
830 } else if (flag->is_intx()) {
831 intx v;
832 if (parse_integer(value, &v)) {
833 result = JVMFlagAccess::set_intx(flag, &v, origin);
834 }
835 } else if (flag->is_uintx()) {
836 uintx v;
837 if (parse_integer(value, &v)) {
838 result = JVMFlagAccess::set_uintx(flag, &v, origin);
839 }
840 } else if (flag->is_uint64_t()) {
841 uint64_t v;
842 if (parse_integer(value, &v)) {
843 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
844 }
845 } else if (flag->is_size_t()) {
846 size_t v;
847 if (parse_integer(value, &v)) {
848 result = JVMFlagAccess::set_size_t(flag, &v, origin);
849 }
850 }
851
852 return result == JVMFlag::SUCCESS;
853 }
854
855 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
856 if (value[0] == '\0') {
857 value = nullptr;
858 }
859 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
860 // Contract: JVMFlag always returns a pointer that needs freeing.
861 FREE_C_HEAP_ARRAY(value);
862 return true;
863 }
864
865 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
866 const char* old_value = "";
867 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
868 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
869 size_t new_len = strlen(new_value);
870 const char* value;
871 char* free_this_too = nullptr;
872 if (old_len == 0) {
873 value = new_value;
874 } else if (new_len == 0) {
875 value = old_value;
876 } else {
877 size_t length = old_len + 1 + new_len + 1;
878 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
879 // each new setting adds another LINE to the switch:
880 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
881 value = buf;
882 free_this_too = buf;
883 }
884 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
885 // JVMFlag always returns a pointer that needs freeing.
886 FREE_C_HEAP_ARRAY(value);
887 // JVMFlag made its own copy, so I must delete my own temp. buffer.
888 FREE_C_HEAP_ARRAY(free_this_too);
889 return true;
890 }
891
892 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
893 const char* real_name = real_flag_name(arg);
894 JDK_Version since = JDK_Version();
895 switch (is_deprecated_flag(arg, &since)) {
896 case -1: {
897 // Obsolete or expired, so don't process normally,
898 // but allow for an obsolete flag we're still
899 // temporarily allowing.
900 if (!is_obsolete_flag(arg, &since)) {
901 return real_name;
902 }
903 // Note if we're not considered obsolete then we can't be expired either
904 // as obsoletion must come first.
905 return nullptr;
906 }
907 case 0:
908 return real_name;
909 case 1: {
910 char version[256];
911 since.to_string(version, sizeof(version));
912 if (real_name != arg) {
913 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
914 arg, version, real_name);
915 } else {
916 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
917 arg, version);
918 }
919 return real_name;
920 }
921 }
922 ShouldNotReachHere();
923 return nullptr;
924 }
925
926 #define BUFLEN 255
927
928 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
929 char name_copied[BUFLEN+1];
930 if (name[name_length] != 0) {
931 if (name_length > BUFLEN) {
932 return nullptr;
933 } else {
934 strncpy(name_copied, name, name_length);
935 name_copied[name_length] = '\0';
936 name = name_copied;
937 }
938 }
939
940 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
941 if (real_name == nullptr) {
942 return nullptr;
943 }
944 JVMFlag* flag = JVMFlag::find_flag(real_name);
945 return flag;
946 }
947
948 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
949 bool is_bool = false;
950 bool bool_val = false;
951 char c = *arg;
952 if (c == '+' || c == '-') {
953 is_bool = true;
954 bool_val = (c == '+');
955 arg++;
956 }
957
958 const char* name = arg;
959 while (true) {
960 c = *arg;
961 if (isalnum(c) || (c == '_')) {
962 ++arg;
963 } else {
964 break;
965 }
966 }
967
968 size_t name_len = size_t(arg - name);
969 if (name_len == 0) {
970 return false;
971 }
972
973 JVMFlag* flag = find_jvm_flag(name, name_len);
974 if (flag == nullptr) {
975 return false;
976 }
977
978 if (is_bool) {
979 if (*arg != 0) {
980 // Error -- extra characters such as -XX:+BoolFlag=123
981 return false;
982 }
983 return set_bool_flag(flag, bool_val, origin);
984 }
985
986 if (arg[0] == '=') {
987 const char* value = arg + 1;
988 if (flag->is_ccstr()) {
989 if (flag->ccstr_accumulates()) {
990 return append_to_string_flag(flag, value, origin);
991 } else {
992 return set_string_flag(flag, value, origin);
993 }
994 } else if (flag->is_double()) {
995 return set_fp_numeric_flag(flag, value, origin);
996 } else {
997 return set_numeric_flag(flag, value, origin);
998 }
999 }
1000
1001 if (arg[0] == ':' && arg[1] == '=') {
1002 // -XX:Foo:=xxx will reset the string flag to the given value.
1003 const char* value = arg + 2;
1004 return set_string_flag(flag, value, origin);
1005 }
1006
1007 return false;
1008 }
1009
1010 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1011 assert(bldarray != nullptr, "illegal argument");
1012
1013 if (arg == nullptr) {
1014 return;
1015 }
1016
1017 int new_count = *count + 1;
1018
1019 // expand the array and add arg to the last element
1020 if (*bldarray == nullptr) {
1021 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1022 } else {
1023 *bldarray = REALLOC_C_HEAP_ARRAY(*bldarray, new_count, mtArguments);
1024 }
1025 (*bldarray)[*count] = os::strdup_check_oom(arg);
1026 *count = new_count;
1027 }
1028
1029 void Arguments::build_jvm_args(const char* arg) {
1030 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1031 }
1032
1033 void Arguments::build_jvm_flags(const char* arg) {
1034 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1035 }
1036
1037 // utility function to return a string that concatenates all
1038 // strings in a given char** array
1039 const char* Arguments::build_resource_string(char** args, int count) {
1040 if (args == nullptr || count == 0) {
1041 return nullptr;
1042 }
1043 size_t length = 0;
1044 for (int i = 0; i < count; i++) {
1045 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1046 }
1047 char* s = NEW_RESOURCE_ARRAY(char, length);
1048 char* dst = s;
1049 for (int j = 0; j < count; j++) {
1050 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1051 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1052 dst += offset;
1053 length -= offset;
1054 }
1055 return (const char*) s;
1056 }
1057
1058 void Arguments::print_on(outputStream* st) {
1059 st->print_cr("VM Arguments:");
1060 if (num_jvm_flags() > 0) {
1061 st->print("jvm_flags: "); print_jvm_flags_on(st);
1062 st->cr();
1063 }
1064 if (num_jvm_args() > 0) {
1065 st->print("jvm_args: "); print_jvm_args_on(st);
1066 st->cr();
1067 }
1068 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1069 if (_java_class_path != nullptr) {
1070 char* path = _java_class_path->value();
1071 size_t len = strlen(path);
1072 st->print("java_class_path (initial): ");
1073 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1074 if (len == 0) {
1075 st->print_raw_cr("<not set>");
1076 } else {
1077 st->print_raw_cr(path, len);
1078 }
1079 }
1080 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1081 }
1082
1083 void Arguments::print_summary_on(outputStream* st) {
1084 // Print the command line. Environment variables that are helpful for
1085 // reproducing the problem are written later in the hs_err file.
1086 // flags are from setting file
1087 if (num_jvm_flags() > 0) {
1088 st->print_raw("Settings File: ");
1089 print_jvm_flags_on(st);
1090 st->cr();
1091 }
1092 // args are the command line and environment variable arguments.
1093 st->print_raw("Command Line: ");
1094 if (num_jvm_args() > 0) {
1095 print_jvm_args_on(st);
1096 }
1097 // this is the classfile and any arguments to the java program
1098 if (java_command() != nullptr) {
1099 st->print("%s", java_command());
1100 }
1101 st->cr();
1102 }
1103
1104 void Arguments::set_jvm_flags_file(const char *value) {
1105 if (_jvm_flags_file != nullptr) {
1106 os::free(_jvm_flags_file);
1107 }
1108 _jvm_flags_file = os::strdup_check_oom(value);
1109 }
1110
1111 void Arguments::print_jvm_flags_on(outputStream* st) {
1112 if (_num_jvm_flags > 0) {
1113 for (int i=0; i < _num_jvm_flags; i++) {
1114 st->print("%s ", _jvm_flags_array[i]);
1115 }
1116 }
1117 }
1118
1119 void Arguments::print_jvm_args_on(outputStream* st) {
1120 if (_num_jvm_args > 0) {
1121 for (int i=0; i < _num_jvm_args; i++) {
1122 st->print("%s ", _jvm_args_array[i]);
1123 }
1124 }
1125 }
1126
1127 bool Arguments::process_argument(const char* arg,
1128 jboolean ignore_unrecognized,
1129 JVMFlagOrigin origin) {
1130 JDK_Version since = JDK_Version();
1131
1132 if (parse_argument(arg, origin)) {
1133 return true;
1134 }
1135
1136 // Determine if the flag has '+', '-', or '=' characters.
1137 bool has_plus_minus = (*arg == '+' || *arg == '-');
1138 const char* const argname = has_plus_minus ? arg + 1 : arg;
1139
1140 size_t arg_len;
1141 const char* equal_sign = strchr(argname, '=');
1142 if (equal_sign == nullptr) {
1143 arg_len = strlen(argname);
1144 } else {
1145 arg_len = equal_sign - argname;
1146 }
1147
1148 // Only make the obsolete check for valid arguments.
1149 if (arg_len <= BUFLEN) {
1150 // Construct a string which consists only of the argument name without '+', '-', or '='.
1151 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1152 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1153 if (is_obsolete_flag(stripped_argname, &since)) {
1154 char version[256];
1155 since.to_string(version, sizeof(version));
1156 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1157 return true;
1158 }
1159 }
1160
1161 // For locked flags, report a custom error message if available.
1162 // Otherwise, report the standard unrecognized VM option.
1163 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1164 if (found_flag != nullptr) {
1165 char locked_message_buf[BUFLEN];
1166 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1167 if (strlen(locked_message_buf) != 0) {
1168 #ifdef PRODUCT
1169 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1170 if (ignore_unrecognized && mismatched) {
1171 return true;
1172 }
1173 #endif
1174 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1175 }
1176 if (found_flag->is_bool() && !has_plus_minus) {
1177 jio_fprintf(defaultStream::error_stream(),
1178 "Missing +/- setting for VM option '%s'\n", argname);
1179 } else if (!found_flag->is_bool() && has_plus_minus) {
1180 jio_fprintf(defaultStream::error_stream(),
1181 "Unexpected +/- setting in VM option '%s'\n", argname);
1182 } else {
1183 jio_fprintf(defaultStream::error_stream(),
1184 "Improperly specified VM option '%s'\n", argname);
1185 }
1186 } else {
1187 if (ignore_unrecognized) {
1188 return true;
1189 }
1190 jio_fprintf(defaultStream::error_stream(),
1191 "Unrecognized VM option '%s'\n", argname);
1192 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1193 if (fuzzy_matched != nullptr) {
1194 jio_fprintf(defaultStream::error_stream(),
1195 "Did you mean '%s%s%s'?\n",
1196 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1197 fuzzy_matched->name(),
1198 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1199 }
1200 }
1201
1202 // allow for commandline "commenting out" options like -XX:#+Verbose
1203 return arg[0] == '#';
1204 }
1205
1206 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1207 FILE* stream = os::fopen(file_name, "rb");
1208 if (stream == nullptr) {
1209 if (should_exist) {
1210 jio_fprintf(defaultStream::error_stream(),
1211 "Could not open settings file %s\n", file_name);
1212 return false;
1213 } else {
1214 return true;
1215 }
1216 }
1217
1218 char token[1024];
1219 size_t pos = 0;
1220
1221 bool in_white_space = true;
1222 bool in_comment = false;
1223 bool in_quote = false;
1224 char quote_c = 0;
1225 bool result = true;
1226
1227 int c_or_eof = getc(stream);
1228 while (c_or_eof != EOF && pos < (sizeof(token) - 1)) {
1229 // We have checked the c_or_eof for EOF. getc should only ever return the
1230 // EOF or an unsigned char converted to an int. We cast down to a char to
1231 // avoid the char to int promotions we would otherwise do in the comparisons
1232 // below (which would be incorrect if we ever compared to a non-ascii char),
1233 // and the int to char conversions we would otherwise do in the assignments.
1234 const char c = static_cast<char>(c_or_eof);
1235 if (in_white_space) {
1236 if (in_comment) {
1237 if (c == '\n') in_comment = false;
1238 } else {
1239 if (c == '#') in_comment = true;
1240 else if (!isspace((unsigned char) c)) {
1241 in_white_space = false;
1242 token[pos++] = c;
1243 }
1244 }
1245 } else {
1246 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1247 // token ends at newline, or at unquoted whitespace
1248 // this allows a way to include spaces in string-valued options
1249 token[pos] = '\0';
1250 logOption(token);
1251 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1252 build_jvm_flags(token);
1253 pos = 0;
1254 in_white_space = true;
1255 in_quote = false;
1256 } else if (!in_quote && (c == '\'' || c == '"')) {
1257 in_quote = true;
1258 quote_c = c;
1259 } else if (in_quote && (c == quote_c)) {
1260 in_quote = false;
1261 } else {
1262 token[pos++] = c;
1263 }
1264 }
1265 c_or_eof = getc(stream);
1266 }
1267 if (pos > 0) {
1268 token[pos] = '\0';
1269 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1270 build_jvm_flags(token);
1271 }
1272 fclose(stream);
1273 return result;
1274 }
1275
1276 //=============================================================================================================
1277 // Parsing of properties (-D)
1278
1279 const char* Arguments::get_property(const char* key) {
1280 return PropertyList_get_value(system_properties(), key);
1281 }
1282
1283 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1284 const char* eq = strchr(prop, '=');
1285 const char* key;
1286 const char* value = "";
1287
1288 if (eq == nullptr) {
1289 // property doesn't have a value, thus use passed string
1290 key = prop;
1291 } else {
1292 // property have a value, thus extract it and save to the
1293 // allocated string
1294 size_t key_len = eq - prop;
1295 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1296
1297 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1298 key = tmp_key;
1299
1300 value = &prop[key_len + 1];
1301 }
1302
1303 if (internal == ExternalProperty) {
1304 CDSConfig::check_incompatible_property(key, value);
1305 }
1306
1307 if (strcmp(key, "java.compiler") == 0) {
1308 // we no longer support java.compiler system property, log a warning and let it get
1309 // passed to Java, like any other system property
1310 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1311 // for applications using NONE or empty value, log a more informative message
1312 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1313 } else {
1314 warning("The java.compiler system property is obsolete and no longer supported.");
1315 }
1316 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1317 // append is true, writable is true, internal is false
1318 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1319 WriteableProperty, ExternalProperty);
1320 } else {
1321 if (strcmp(key, "sun.java.command") == 0) {
1322 char *old_java_command = _java_command;
1323 _java_command = os::strdup_check_oom(value, mtArguments);
1324 if (old_java_command != nullptr) {
1325 os::free(old_java_command);
1326 }
1327 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1328 // If this property is set on the command line then its value will be
1329 // displayed in VM error logs as the URL at which to submit such logs.
1330 // Normally the URL displayed in error logs is different from the value
1331 // of this system property, so a different property should have been
1332 // used here, but we leave this as-is in case someone depends upon it.
1333 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1334 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1335 // its value without going through the property list or making a Java call.
1336 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1337 if (old_java_vendor_url_bug != nullptr) {
1338 os::free((void *)old_java_vendor_url_bug);
1339 }
1340 }
1341
1342 // Create new property and add at the end of the list
1343 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1344 }
1345
1346 if (key != prop) {
1347 // SystemProperty copy passed value, thus free previously allocated
1348 // memory
1349 FreeHeap((void *)key);
1350 }
1351
1352 return true;
1353 }
1354
1355 //===========================================================================================================
1356 // Setting int/mixed/comp mode flags
1357
1358 void Arguments::set_mode_flags(Mode mode) {
1359 // Set up default values for all flags.
1360 // If you add a flag to any of the branches below,
1361 // add a default value for it here.
1362 _mode = mode;
1363
1364 // Ensure Agent_OnLoad has the correct initial values.
1365 // This may not be the final mode; mode may change later in onload phase.
1366 PropertyList_unique_add(&_system_properties, "java.vm.info",
1367 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1368
1369 UseInterpreter = true;
1370 UseCompiler = true;
1371 UseLoopCounter = true;
1372
1373 // Default values may be platform/compiler dependent -
1374 // use the saved values
1375 ClipInlining = Arguments::_ClipInlining;
1376 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1377 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1378 BackgroundCompilation = Arguments::_BackgroundCompilation;
1379
1380 // Change from defaults based on mode
1381 switch (mode) {
1382 default:
1383 ShouldNotReachHere();
1384 break;
1385 case _int:
1386 UseCompiler = false;
1387 UseLoopCounter = false;
1388 AlwaysCompileLoopMethods = false;
1389 UseOnStackReplacement = false;
1390 break;
1391 case _mixed:
1392 // same as default
1393 break;
1394 case _comp:
1395 UseInterpreter = false;
1396 BackgroundCompilation = false;
1397 ClipInlining = false;
1398 break;
1399 }
1400 }
1401
1402 // Conflict: required to use shared spaces (-Xshare:on), but
1403 // incompatible command line options were chosen.
1404 void Arguments::no_shared_spaces(const char* message) {
1405 if (RequireSharedSpaces) {
1406 aot_log_error(aot)("%s is incompatible with other specified options.",
1407 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1408 if (CDSConfig::new_aot_flags_used()) {
1409 vm_exit_during_initialization("Unable to use AOT cache", message);
1410 } else {
1411 vm_exit_during_initialization("Unable to use shared archive", message);
1412 }
1413 } else {
1414 if (CDSConfig::new_aot_flags_used()) {
1415 log_warning(aot)("Unable to use AOT cache: %s", message);
1416 } else {
1417 aot_log_info(aot)("Unable to use shared archive: %s", message);
1418 }
1419 UseSharedSpaces = false;
1420 }
1421 }
1422
1423 static void set_object_alignment() {
1424 // Object alignment.
1425 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1426 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1427 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1428 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1429 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1430 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1431
1432 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1433 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1434
1435 // Oop encoding heap max
1436 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1437 }
1438
1439 size_t Arguments::max_heap_for_compressed_oops() {
1440 // Avoid sign flip.
1441 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1442 // We need to fit both the null page and the heap into the memory budget, while
1443 // keeping alignment constraints of the heap. To guarantee the latter, as the
1444 // null page is located before the heap, we pad the null page to the conservative
1445 // maximum alignment that the GC may ever impose upon the heap.
1446 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1447 _conservative_max_heap_alignment);
1448
1449 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1450 NOT_LP64(ShouldNotReachHere(); return 0);
1451 }
1452
1453 void Arguments::set_use_compressed_oops() {
1454 #ifdef _LP64
1455 // MaxHeapSize is not set up properly at this point, but
1456 // the only value that can override MaxHeapSize if we are
1457 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1458 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1459
1460 if (max_heap_size <= max_heap_for_compressed_oops()) {
1461 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1462 FLAG_SET_ERGO(UseCompressedOops, true);
1463 }
1464 } else {
1465 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1466 warning("Max heap size too large for Compressed Oops");
1467 FLAG_SET_DEFAULT(UseCompressedOops, false);
1468 }
1469 }
1470 #endif // _LP64
1471 }
1472
1473 void Arguments::set_conservative_max_heap_alignment() {
1474 // The conservative maximum required alignment for the heap is the maximum of
1475 // the alignments imposed by several sources: any requirements from the heap
1476 // itself and the maximum page size we may run the VM with.
1477 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1478 _conservative_max_heap_alignment = MAX3(heap_alignment,
1479 os::vm_allocation_granularity(),
1480 os::max_page_size());
1481 assert(is_power_of_2(_conservative_max_heap_alignment), "Expected to be a power-of-2");
1482 }
1483
1484 jint Arguments::set_ergonomics_flags() {
1485 GCConfig::initialize();
1486
1487 set_conservative_max_heap_alignment();
1488
1489 #ifdef _LP64
1490 set_use_compressed_oops();
1491
1492 // Also checks that certain machines are slower with compressed oops
1493 // in vm_version initialization code.
1494 #endif // _LP64
1495
1496 return JNI_OK;
1497 }
1498
1499 // This must be called after ergonomics.
1500 void Arguments::set_bytecode_flags() {
1501 if (!RewriteBytecodes) {
1502 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1503 }
1504 }
1505
1506 // Aggressive optimization flags
1507 jint Arguments::set_aggressive_opts_flags() {
1508 #ifdef COMPILER2
1509 if (AggressiveUnboxing) {
1510 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1511 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1512 } else if (!EliminateAutoBox) {
1513 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1514 AggressiveUnboxing = false;
1515 }
1516 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1517 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1518 } else if (!DoEscapeAnalysis) {
1519 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1520 AggressiveUnboxing = false;
1521 }
1522 }
1523 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1524 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1525 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1526 }
1527 // Feed the cache size setting into the JDK
1528 char buffer[1024];
1529 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1530 if (!add_property(buffer)) {
1531 return JNI_ENOMEM;
1532 }
1533 }
1534 #endif
1535
1536 return JNI_OK;
1537 }
1538
1539 //===========================================================================================================
1540
1541 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1542 if (_sun_java_launcher != _default_java_launcher) {
1543 os::free(const_cast<char*>(_sun_java_launcher));
1544 }
1545 _sun_java_launcher = os::strdup_check_oom(launcher);
1546 }
1547
1548 bool Arguments::created_by_java_launcher() {
1549 assert(_sun_java_launcher != nullptr, "property must have value");
1550 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1551 }
1552
1553 bool Arguments::executing_unit_tests() {
1554 return _executing_unit_tests;
1555 }
1556
1557 //===========================================================================================================
1558 // Parsing of main arguments
1559
1560 static unsigned int addreads_count = 0;
1561 static unsigned int addexports_count = 0;
1562 static unsigned int addopens_count = 0;
1563 static unsigned int patch_mod_count = 0;
1564 static unsigned int enable_native_access_count = 0;
1565 static unsigned int enable_final_field_mutation = 0;
1566 static bool patch_mod_javabase = false;
1567
1568 // Check the consistency of vm_init_args
1569 bool Arguments::check_vm_args_consistency() {
1570 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1571 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
1572 return false;
1573 }
1574
1575 // Method for adding checks for flag consistency.
1576 // The intent is to warn the user of all possible conflicts,
1577 // before returning an error.
1578 // Note: Needs platform-dependent factoring.
1579 bool status = true;
1580
1581 status = CompilerConfig::check_args_consistency(status);
1582 #if INCLUDE_JFR
1583 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1584 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1585 return false;
1586 }
1587 }
1588 #endif
1589
1590 #ifndef SUPPORT_RESERVED_STACK_AREA
1591 if (StackReservedPages != 0) {
1592 FLAG_SET_CMDLINE(StackReservedPages, 0);
1593 warning("Reserved Stack Area not supported on this platform");
1594 }
1595 #endif
1596
1597 return status;
1598 }
1599
1600 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1601 const char* option_type) {
1602 if (ignore) return false;
1603
1604 const char* spacer = " ";
1605 if (option_type == nullptr) {
1606 option_type = ++spacer; // Set both to the empty string.
1607 }
1608
1609 jio_fprintf(defaultStream::error_stream(),
1610 "Unrecognized %s%soption: %s\n", option_type, spacer,
1611 option->optionString);
1612 return true;
1613 }
1614
1615 static const char* user_assertion_options[] = {
1616 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1617 };
1618
1619 static const char* system_assertion_options[] = {
1620 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1621 };
1622
1623 bool Arguments::parse_uint(const char* value,
1624 uint* uint_arg,
1625 uint min_size) {
1626 uint n;
1627 if (!parse_integer(value, &n)) {
1628 return false;
1629 }
1630 if (n >= min_size) {
1631 *uint_arg = n;
1632 return true;
1633 } else {
1634 return false;
1635 }
1636 }
1637
1638 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1639 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1640 CDSConfig::check_internal_module_property(prop_name, prop_value);
1641 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1642 char* property = AllocateHeap(prop_len, mtArguments);
1643 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1644 if (ret < 0 || ret >= (int)prop_len) {
1645 FreeHeap(property);
1646 return false;
1647 }
1648 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1649 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1650 // that multiple occurrences of the associated flag just causes the existing property value to be
1651 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1652 // to a property after we have finished flag processing.
1653 bool added = add_property(property, WriteableProperty, internal);
1654 FreeHeap(property);
1655 return added;
1656 }
1657
1658 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1659 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1660 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1661 const unsigned int props_count_limit = 1000;
1662 const int max_digits = 3;
1663 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1664
1665 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1666 if (count < props_count_limit) {
1667 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1668 char* property = AllocateHeap(prop_len, mtArguments);
1669 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1670 if (ret < 0 || ret >= (int)prop_len) {
1671 FreeHeap(property);
1672 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1673 return false;
1674 }
1675 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1676 FreeHeap(property);
1677 return added;
1678 }
1679
1680 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1681 return false;
1682 }
1683
1684 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1685 julong* long_arg,
1686 julong min_size,
1687 julong max_size) {
1688 if (!parse_integer(s, long_arg)) return arg_unreadable;
1689 return check_memory_size(*long_arg, min_size, max_size);
1690 }
1691
1692 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) {
1693 // Save default settings for some mode flags
1694 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1695 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1696 Arguments::_ClipInlining = ClipInlining;
1697 Arguments::_BackgroundCompilation = BackgroundCompilation;
1698
1699 // Remember the default value of SharedBaseAddress.
1700 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1701
1702 // Setup flags for mixed which is the default
1703 set_mode_flags(_mixed);
1704
1705 jint result;
1706 for (int i = 0; i < all_args->length(); i++) {
1707 result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin);
1708 if (result != JNI_OK) {
1709 return result;
1710 }
1711 }
1712
1713 // Disable CDS for exploded image
1714 if (!has_jimage()) {
1715 no_shared_spaces("CDS disabled on exploded JDK");
1716 }
1717
1718 // We need to ensure processor and memory resources have been properly
1719 // configured - which may rely on arguments we just processed - before
1720 // doing the final argument processing. Any argument processing that
1721 // needs to know about processor and memory resources must occur after
1722 // this point.
1723
1724 os::init_container_support();
1725
1726 SystemMemoryBarrier::initialize();
1727
1728 // Do final processing now that all arguments have been parsed
1729 result = finalize_vm_init_args();
1730 if (result != JNI_OK) {
1731 return result;
1732 }
1733
1734 return JNI_OK;
1735 }
1736
1737 #if !INCLUDE_JVMTI || INCLUDE_CDS
1738 // Checks if name in command-line argument -agent{lib,path}:name[=options]
1739 // represents a valid JDWP agent. is_path==true denotes that we
1740 // are dealing with -agentpath (case where name is a path), otherwise with
1741 // -agentlib
1742 static bool valid_jdwp_agent(char *name, bool is_path) {
1743 char *_name;
1744 const char *_jdwp = "jdwp";
1745 size_t _len_jdwp, _len_prefix;
1746
1747 if (is_path) {
1748 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
1749 return false;
1750 }
1751
1752 _name++; // skip past last path separator
1753 _len_prefix = strlen(JNI_LIB_PREFIX);
1754
1755 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
1756 return false;
1757 }
1758
1759 _name += _len_prefix;
1760 _len_jdwp = strlen(_jdwp);
1761
1762 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
1763 _name += _len_jdwp;
1764 }
1765 else {
1766 return false;
1767 }
1768
1769 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
1770 return false;
1771 }
1772
1773 return true;
1774 }
1775
1776 if (strcmp(name, _jdwp) == 0) {
1777 return true;
1778 }
1779
1780 return false;
1781 }
1782 #endif
1783
1784 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
1785 // --patch-module=<module>=<file>(<pathsep><file>)*
1786 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
1787 // Find the equal sign between the module name and the path specification
1788 const char* module_equal = strchr(patch_mod_tail, '=');
1789 if (module_equal == nullptr) {
1790 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
1791 return JNI_ERR;
1792 } else {
1793 // Pick out the module name
1794 size_t module_len = module_equal - patch_mod_tail;
1795 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
1796 if (module_name != nullptr) {
1797 memcpy(module_name, patch_mod_tail, module_len);
1798 *(module_name + module_len) = '\0';
1799 // The path piece begins one past the module_equal sign
1800 add_patch_mod_prefix(module_name, module_equal + 1);
1801 FREE_C_HEAP_ARRAY(module_name);
1802 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
1803 return JNI_ENOMEM;
1804 }
1805 } else {
1806 return JNI_ENOMEM;
1807 }
1808 }
1809 return JNI_OK;
1810 }
1811
1812 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
1813 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
1814 // The min and max sizes match the values in globals.hpp, but scaled
1815 // with K. The values have been chosen so that alignment with page
1816 // size doesn't change the max value, which makes the conversions
1817 // back and forth between Xss value and ThreadStackSize value easier.
1818 // The values have also been chosen to fit inside a 32-bit signed type.
1819 const julong min_ThreadStackSize = 0;
1820 const julong max_ThreadStackSize = 1 * M;
1821
1822 // Make sure the above values match the range set in globals.hpp
1823 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
1824 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
1825 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
1826
1827 const julong min_size = min_ThreadStackSize * K;
1828 const julong max_size = max_ThreadStackSize * K;
1829
1830 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
1831
1832 julong size = 0;
1833 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
1834 if (errcode != arg_in_range) {
1835 bool silent = (option == nullptr); // Allow testing to silence error messages
1836 if (!silent) {
1837 jio_fprintf(defaultStream::error_stream(),
1838 "Invalid thread stack size: %s\n", option->optionString);
1839 describe_range_error(errcode);
1840 }
1841 return JNI_EINVAL;
1842 }
1843
1844 // Internally track ThreadStackSize in units of 1024 bytes.
1845 const julong size_aligned = align_up(size, K);
1846 assert(size <= size_aligned,
1847 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
1848 size, size_aligned);
1849
1850 const julong size_in_K = size_aligned / K;
1851 assert(size_in_K < (julong)max_intx,
1852 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
1853 size_in_K);
1854
1855 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
1856 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
1857 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
1858 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
1859 max_expanded, size_in_K);
1860
1861 *out_ThreadStackSize = (intx)size_in_K;
1862
1863 return JNI_OK;
1864 }
1865
1866 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
1867 // For match_option to return remaining or value part of option string
1868 const char* tail;
1869
1870 // iterate over arguments
1871 for (int index = 0; index < args->nOptions; index++) {
1872 bool is_absolute_path = false; // for -agentpath vs -agentlib
1873
1874 const JavaVMOption* option = args->options + index;
1875
1876 if (!match_option(option, "-Djava.class.path", &tail) &&
1877 !match_option(option, "-Dsun.java.command", &tail) &&
1878 !match_option(option, "-Dsun.java.launcher", &tail)) {
1879
1880 // add all jvm options to the jvm_args string. This string
1881 // is used later to set the java.vm.args PerfData string constant.
1882 // the -Djava.class.path and the -Dsun.java.command options are
1883 // omitted from jvm_args string as each have their own PerfData
1884 // string constant object.
1885 build_jvm_args(option->optionString);
1886 }
1887
1888 // -verbose:[class/module/gc/jni]
1889 if (match_option(option, "-verbose", &tail)) {
1890 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
1891 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
1892 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
1893 } else if (!strcmp(tail, ":module")) {
1894 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
1895 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
1896 } else if (!strcmp(tail, ":gc")) {
1897 if (_legacyGCLogging.lastFlag == 0) {
1898 _legacyGCLogging.lastFlag = 1;
1899 }
1900 } else if (!strcmp(tail, ":jni")) {
1901 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
1902 }
1903 // -da / -ea / -disableassertions / -enableassertions
1904 // These accept an optional class/package name separated by a colon, e.g.,
1905 // -da:java.lang.Thread.
1906 } else if (match_option(option, user_assertion_options, &tail, true)) {
1907 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1908 if (*tail == '\0') {
1909 JavaAssertions::setUserClassDefault(enable);
1910 } else {
1911 assert(*tail == ':', "bogus match by match_option()");
1912 JavaAssertions::addOption(tail + 1, enable);
1913 }
1914 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
1915 } else if (match_option(option, system_assertion_options, &tail, false)) {
1916 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1917 JavaAssertions::setSystemClassDefault(enable);
1918 // -bootclasspath:
1919 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
1920 jio_fprintf(defaultStream::output_stream(),
1921 "-Xbootclasspath is no longer a supported option.\n");
1922 return JNI_EINVAL;
1923 // -bootclasspath/a:
1924 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
1925 Arguments::append_sysclasspath(tail);
1926 // -bootclasspath/p:
1927 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
1928 jio_fprintf(defaultStream::output_stream(),
1929 "-Xbootclasspath/p is no longer a supported option.\n");
1930 return JNI_EINVAL;
1931 // -Xrun
1932 } else if (match_option(option, "-Xrun", &tail)) {
1933 if (tail != nullptr) {
1934 const char* pos = strchr(tail, ':');
1935 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
1936 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
1937 jio_snprintf(name, len + 1, "%s", tail);
1938
1939 char *options = nullptr;
1940 if(pos != nullptr) {
1941 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
1942 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
1943 }
1944 #if !INCLUDE_JVMTI
1945 if (strcmp(name, "jdwp") == 0) {
1946 jio_fprintf(defaultStream::error_stream(),
1947 "Debugging agents are not supported in this VM\n");
1948 return JNI_ERR;
1949 }
1950 #endif // !INCLUDE_JVMTI
1951 JvmtiAgentList::add_xrun(name, options, false);
1952 FREE_C_HEAP_ARRAY(name);
1953 FREE_C_HEAP_ARRAY(options);
1954 }
1955 } else if (match_option(option, "--add-reads=", &tail)) {
1956 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
1957 return JNI_ENOMEM;
1958 }
1959 } else if (match_option(option, "--add-exports=", &tail)) {
1960 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
1961 return JNI_ENOMEM;
1962 }
1963 } else if (match_option(option, "--add-opens=", &tail)) {
1964 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
1965 return JNI_ENOMEM;
1966 }
1967 } else if (match_option(option, "--add-modules=", &tail)) {
1968 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
1969 return JNI_ENOMEM;
1970 }
1971 } else if (match_option(option, "--enable-native-access=", &tail)) {
1972 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
1973 return JNI_ENOMEM;
1974 }
1975 } else if (match_option(option, "--illegal-native-access=", &tail)) {
1976 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
1977 return JNI_ENOMEM;
1978 }
1979 } else if (match_option(option, "--limit-modules=", &tail)) {
1980 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
1981 return JNI_ENOMEM;
1982 }
1983 } else if (match_option(option, "--module-path=", &tail)) {
1984 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
1985 return JNI_ENOMEM;
1986 }
1987 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
1988 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
1989 return JNI_ENOMEM;
1990 }
1991 } else if (match_option(option, "--patch-module=", &tail)) {
1992 // --patch-module=<module>=<file>(<pathsep><file>)*
1993 int res = process_patch_mod_option(tail);
1994 if (res != JNI_OK) {
1995 return res;
1996 }
1997 } else if (match_option(option, "--enable-final-field-mutation=", &tail)) {
1998 if (!create_numbered_module_property("jdk.module.enable.final.field.mutation", tail, enable_final_field_mutation++)) {
1999 return JNI_ENOMEM;
2000 }
2001 } else if (match_option(option, "--illegal-final-field-mutation=", &tail)) {
2002 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2003 PropertyList_unique_add(&_system_properties, "jdk.module.illegal.final.field.mutation", tail,
2004 AddProperty, WriteableProperty, InternalProperty);
2005 } else {
2006 jio_fprintf(defaultStream::error_stream(),
2007 "Value specified to --illegal-final-field-mutation not recognized: '%s'\n", tail);
2008 return JNI_ERR;
2009 }
2010 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2011 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2012 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2013 AddProperty, WriteableProperty, InternalProperty);
2014 } else {
2015 jio_fprintf(defaultStream::error_stream(),
2016 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2017 return JNI_ERR;
2018 }
2019 } else if (match_option(option, "--illegal-access=", &tail)) {
2020 char version[256];
2021 JDK_Version::jdk(17).to_string(version, sizeof(version));
2022 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2023 // -agentlib and -agentpath
2024 } else if (match_option(option, "-agentlib:", &tail) ||
2025 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2026 if(tail != nullptr) {
2027 const char* pos = strchr(tail, '=');
2028 char* name;
2029 if (pos == nullptr) {
2030 name = os::strdup_check_oom(tail, mtArguments);
2031 } else {
2032 size_t len = pos - tail;
2033 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2034 memcpy(name, tail, len);
2035 name[len] = '\0';
2036 }
2037
2038 char *options = nullptr;
2039 if(pos != nullptr) {
2040 options = os::strdup_check_oom(pos + 1, mtArguments);
2041 }
2042 #if !INCLUDE_JVMTI
2043 if (valid_jdwp_agent(name, is_absolute_path)) {
2044 jio_fprintf(defaultStream::error_stream(),
2045 "Debugging agents are not supported in this VM\n");
2046 return JNI_ERR;
2047 }
2048 #elif INCLUDE_CDS
2049 if (valid_jdwp_agent(name, is_absolute_path)) {
2050 _has_jdwp_agent = true;
2051 }
2052 #endif // !INCLUDE_JVMTI
2053 JvmtiAgentList::add(name, options, is_absolute_path);
2054 os::free(name);
2055 os::free(options);
2056 }
2057 // -javaagent
2058 } else if (match_option(option, "-javaagent:", &tail)) {
2059 #if !INCLUDE_JVMTI
2060 jio_fprintf(defaultStream::error_stream(),
2061 "Instrumentation agents are not supported in this VM\n");
2062 return JNI_ERR;
2063 #else
2064 if (tail != nullptr) {
2065 size_t length = strlen(tail) + 1;
2066 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2067 jio_snprintf(options, length, "%s", tail);
2068 JvmtiAgentList::add("instrument", options, false);
2069 FREE_C_HEAP_ARRAY(options);
2070
2071 // java agents need module java.instrument
2072 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2073 return JNI_ENOMEM;
2074 }
2075 }
2076 #endif // !INCLUDE_JVMTI
2077 // --enable_preview
2078 } else if (match_option(option, "--enable-preview")) {
2079 set_enable_preview();
2080 // -Xnoclassgc
2081 } else if (match_option(option, "-Xnoclassgc")) {
2082 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2083 return JNI_EINVAL;
2084 }
2085 // -Xbatch
2086 } else if (match_option(option, "-Xbatch")) {
2087 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2088 return JNI_EINVAL;
2089 }
2090 // -Xmn for compatibility with other JVM vendors
2091 } else if (match_option(option, "-Xmn", &tail)) {
2092 julong long_initial_young_size = 0;
2093 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2094 if (errcode != arg_in_range) {
2095 jio_fprintf(defaultStream::error_stream(),
2096 "Invalid initial young generation size: %s\n", option->optionString);
2097 describe_range_error(errcode);
2098 return JNI_EINVAL;
2099 }
2100 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2101 return JNI_EINVAL;
2102 }
2103 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2104 return JNI_EINVAL;
2105 }
2106 // -Xms
2107 } else if (match_option(option, "-Xms", &tail)) {
2108 julong size = 0;
2109 // an initial heap size of 0 means automatically determine
2110 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2111 if (errcode != arg_in_range) {
2112 jio_fprintf(defaultStream::error_stream(),
2113 "Invalid initial heap size: %s\n", option->optionString);
2114 describe_range_error(errcode);
2115 return JNI_EINVAL;
2116 }
2117 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2118 return JNI_EINVAL;
2119 }
2120 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2121 return JNI_EINVAL;
2122 }
2123 // -Xmx
2124 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2125 julong long_max_heap_size = 0;
2126 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2127 if (errcode != arg_in_range) {
2128 jio_fprintf(defaultStream::error_stream(),
2129 "Invalid maximum heap size: %s\n", option->optionString);
2130 describe_range_error(errcode);
2131 return JNI_EINVAL;
2132 }
2133 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2134 return JNI_EINVAL;
2135 }
2136 // Xmaxf
2137 } else if (match_option(option, "-Xmaxf", &tail)) {
2138 char* err;
2139 double dmaxf = strtod(tail, &err);
2140 if (*err != '\0' || *tail == '\0') {
2141 jio_fprintf(defaultStream::error_stream(),
2142 "Bad max heap free ratio: %s\n",
2143 option->optionString);
2144 return JNI_EINVAL;
2145 }
2146 if (dmaxf < 0.0 || dmaxf > 1.0) {
2147 jio_fprintf(defaultStream::error_stream(),
2148 "-Xmaxf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2149 option->optionString);
2150 return JNI_EINVAL;
2151 }
2152 const uintx umaxf = (uintx)(dmaxf * 100);
2153 if (MinHeapFreeRatio > umaxf) {
2154 jio_fprintf(defaultStream::error_stream(),
2155 "-Xmaxf value (%s) must be greater than or equal to the implicit -Xminf value (%.2f)\n",
2156 tail, MinHeapFreeRatio / 100.0f);
2157 return JNI_EINVAL;
2158 }
2159 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, umaxf) != JVMFlag::SUCCESS) {
2160 return JNI_EINVAL;
2161 }
2162 // Xminf
2163 } else if (match_option(option, "-Xminf", &tail)) {
2164 char* err;
2165 double dminf = strtod(tail, &err);
2166 if (*err != '\0' || *tail == '\0') {
2167 jio_fprintf(defaultStream::error_stream(),
2168 "Bad min heap free ratio: %s\n",
2169 option->optionString);
2170 return JNI_EINVAL;
2171 }
2172 if (dminf < 0.0 || dminf > 1.0) {
2173 jio_fprintf(defaultStream::error_stream(),
2174 "-Xminf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2175 tail);
2176 return JNI_EINVAL;
2177 }
2178 const uintx uminf = (uintx)(dminf * 100);
2179 if (MaxHeapFreeRatio < uminf) {
2180 jio_fprintf(defaultStream::error_stream(),
2181 "-Xminf value (%s) must be less than or equal to the implicit -Xmaxf value (%.2f)\n",
2182 tail, MaxHeapFreeRatio / 100.0f);
2183 return JNI_EINVAL;
2184 }
2185 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, uminf) != JVMFlag::SUCCESS) {
2186 return JNI_EINVAL;
2187 }
2188 // -Xss
2189 } else if (match_option(option, "-Xss", &tail)) {
2190 intx value = 0;
2191 jint err = parse_xss(option, tail, &value);
2192 if (err != JNI_OK) {
2193 return err;
2194 }
2195 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2196 return JNI_EINVAL;
2197 }
2198 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2199 warning("Ignoring option %s; support was removed in JDK 27", option->optionString);
2200 } else if (match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2201 julong long_ReservedCodeCacheSize = 0;
2202
2203 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2204 if (errcode != arg_in_range) {
2205 jio_fprintf(defaultStream::error_stream(),
2206 "Invalid maximum code cache size: %s.\n", option->optionString);
2207 return JNI_EINVAL;
2208 }
2209 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2210 return JNI_EINVAL;
2211 }
2212 // -green
2213 } else if (match_option(option, "-green")) {
2214 jio_fprintf(defaultStream::error_stream(),
2215 "Green threads support not available\n");
2216 return JNI_EINVAL;
2217 // -native
2218 } else if (match_option(option, "-native")) {
2219 // HotSpot always uses native threads, ignore silently for compatibility
2220 // -Xrs
2221 } else if (match_option(option, "-Xrs")) {
2222 // Classic/EVM option, new functionality
2223 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2224 return JNI_EINVAL;
2225 }
2226 // -Xprof
2227 } else if (match_option(option, "-Xprof")) {
2228 char version[256];
2229 // Obsolete in JDK 10
2230 JDK_Version::jdk(10).to_string(version, sizeof(version));
2231 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2232 // -Xinternalversion
2233 } else if (match_option(option, "-Xinternalversion")) {
2234 jio_fprintf(defaultStream::output_stream(), "%s\n",
2235 VM_Version::internal_vm_info_string());
2236 vm_exit(0);
2237 #ifndef PRODUCT
2238 // -Xprintflags
2239 } else if (match_option(option, "-Xprintflags")) {
2240 JVMFlag::printFlags(tty, false);
2241 vm_exit(0);
2242 #endif
2243 // -D
2244 } else if (match_option(option, "-D", &tail)) {
2245 const char* value;
2246 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2247 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2248 // abort if -Djava.endorsed.dirs is set
2249 jio_fprintf(defaultStream::output_stream(),
2250 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2251 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2252 return JNI_EINVAL;
2253 }
2254 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2255 *value != '\0' && strcmp(value, "\"\"") != 0) {
2256 // abort if -Djava.ext.dirs is set
2257 jio_fprintf(defaultStream::output_stream(),
2258 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2259 return JNI_EINVAL;
2260 }
2261 // Check for module related properties. They must be set using the modules
2262 // options. For example: use "--add-modules=java.sql", not
2263 // "-Djdk.module.addmods=java.sql"
2264 if (is_internal_module_property(option->optionString + 2)) {
2265 needs_module_property_warning = true;
2266 continue;
2267 }
2268 if (!add_property(tail)) {
2269 return JNI_ENOMEM;
2270 }
2271 // Out of the box management support
2272 if (match_option(option, "-Dcom.sun.management", &tail)) {
2273 #if INCLUDE_MANAGEMENT
2274 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2275 return JNI_EINVAL;
2276 }
2277 // management agent in module jdk.management.agent
2278 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2279 return JNI_ENOMEM;
2280 }
2281 #else
2282 jio_fprintf(defaultStream::output_stream(),
2283 "-Dcom.sun.management is not supported in this VM.\n");
2284 return JNI_ERR;
2285 #endif
2286 }
2287 // -Xint
2288 } else if (match_option(option, "-Xint")) {
2289 set_mode_flags(_int);
2290 mode_flag_cmd_line = true;
2291 // -Xmixed
2292 } else if (match_option(option, "-Xmixed")) {
2293 set_mode_flags(_mixed);
2294 mode_flag_cmd_line = true;
2295 // -Xcomp
2296 } else if (match_option(option, "-Xcomp")) {
2297 // for testing the compiler; turn off all flags that inhibit compilation
2298 set_mode_flags(_comp);
2299 mode_flag_cmd_line = true;
2300 // -Xshare:dump
2301 } else if (match_option(option, "-Xshare:dump")) {
2302 CDSConfig::enable_dumping_static_archive();
2303 CDSConfig::set_old_cds_flags_used();
2304 // -Xshare:on
2305 } else if (match_option(option, "-Xshare:on")) {
2306 UseSharedSpaces = true;
2307 RequireSharedSpaces = true;
2308 CDSConfig::set_old_cds_flags_used();
2309 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2310 } else if (match_option(option, "-Xshare:auto")) {
2311 UseSharedSpaces = true;
2312 RequireSharedSpaces = false;
2313 xshare_auto_cmd_line = true;
2314 CDSConfig::set_old_cds_flags_used();
2315 // -Xshare:off
2316 } else if (match_option(option, "-Xshare:off")) {
2317 UseSharedSpaces = false;
2318 RequireSharedSpaces = false;
2319 CDSConfig::set_old_cds_flags_used();
2320 // -Xverify
2321 } else if (match_option(option, "-Xverify", &tail)) {
2322 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2323 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2324 return JNI_EINVAL;
2325 }
2326 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2327 return JNI_EINVAL;
2328 }
2329 } else if (strcmp(tail, ":remote") == 0) {
2330 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2331 return JNI_EINVAL;
2332 }
2333 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2334 return JNI_EINVAL;
2335 }
2336 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2337 return JNI_EINVAL;
2338 }
2339 // -Xdebug
2340 } else if (match_option(option, "-Xdebug")) {
2341 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2342 } else if (match_option(option, "-Xloggc:", &tail)) {
2343 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2344 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2345 _legacyGCLogging.lastFlag = 2;
2346 _legacyGCLogging.file = os::strdup_check_oom(tail);
2347 } else if (match_option(option, "-Xlog", &tail)) {
2348 bool ret = false;
2349 if (strcmp(tail, ":help") == 0) {
2350 fileStream stream(defaultStream::output_stream());
2351 LogConfiguration::print_command_line_help(&stream);
2352 vm_exit(0);
2353 } else if (strcmp(tail, ":disable") == 0) {
2354 LogConfiguration::disable_logging();
2355 ret = true;
2356 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2357 const char* async_tail = tail + strlen(":async");
2358 ret = LogConfiguration::parse_async_argument(async_tail);
2359 } else if (*tail == '\0') {
2360 ret = LogConfiguration::parse_command_line_arguments();
2361 assert(ret, "-Xlog without arguments should never fail to parse");
2362 } else if (*tail == ':') {
2363 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2364 }
2365 if (ret == false) {
2366 jio_fprintf(defaultStream::error_stream(),
2367 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2368 tail);
2369 return JNI_EINVAL;
2370 }
2371 // JNI hooks
2372 } else if (match_option(option, "-Xcheck", &tail)) {
2373 if (!strcmp(tail, ":jni")) {
2374 #if !INCLUDE_JNI_CHECK
2375 warning("JNI CHECKING is not supported in this VM");
2376 #else
2377 CheckJNICalls = true;
2378 #endif // INCLUDE_JNI_CHECK
2379 } else if (is_bad_option(option, args->ignoreUnrecognized,
2380 "check")) {
2381 return JNI_EINVAL;
2382 }
2383 } else if (match_option(option, "vfprintf")) {
2384 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2385 } else if (match_option(option, "exit")) {
2386 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2387 } else if (match_option(option, "abort")) {
2388 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2389 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2390 // and the last option wins.
2391 } else if (match_option(option, "-XX:+NeverTenure")) {
2392 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2393 return JNI_EINVAL;
2394 }
2395 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2396 return JNI_EINVAL;
2397 }
2398 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2399 return JNI_EINVAL;
2400 }
2401 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2402 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2403 return JNI_EINVAL;
2404 }
2405 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2406 return JNI_EINVAL;
2407 }
2408 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2409 return JNI_EINVAL;
2410 }
2411 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2412 uint max_tenuring_thresh = 0;
2413 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2414 jio_fprintf(defaultStream::error_stream(),
2415 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2416 return JNI_EINVAL;
2417 }
2418
2419 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2420 return JNI_EINVAL;
2421 }
2422
2423 if (MaxTenuringThreshold == 0) {
2424 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2425 return JNI_EINVAL;
2426 }
2427 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2428 return JNI_EINVAL;
2429 }
2430 } else {
2431 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2432 return JNI_EINVAL;
2433 }
2434 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2435 return JNI_EINVAL;
2436 }
2437 }
2438 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2439 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2440 return JNI_EINVAL;
2441 }
2442 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2443 return JNI_EINVAL;
2444 }
2445 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2446 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2447 return JNI_EINVAL;
2448 }
2449 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2450 return JNI_EINVAL;
2451 }
2452 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2453 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2454 return JNI_EINVAL;
2455 }
2456 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2457 return JNI_EINVAL;
2458 }
2459 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2460 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2461 return JNI_EINVAL;
2462 }
2463 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2464 return JNI_EINVAL;
2465 }
2466 } else if (match_option(option, "--finalization=", &tail)) {
2467 if (strcmp(tail, "enabled") == 0) {
2468 InstanceKlass::set_finalization_enabled(true);
2469 } else if (strcmp(tail, "disabled") == 0) {
2470 InstanceKlass::set_finalization_enabled(false);
2471 } else {
2472 jio_fprintf(defaultStream::error_stream(),
2473 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2474 tail);
2475 return JNI_EINVAL;
2476 }
2477 #if !defined(DTRACE_ENABLED)
2478 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2479 jio_fprintf(defaultStream::error_stream(),
2480 "DTraceMethodProbes flag is not applicable for this configuration\n");
2481 return JNI_EINVAL;
2482 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2483 jio_fprintf(defaultStream::error_stream(),
2484 "DTraceAllocProbes flag is not applicable for this configuration\n");
2485 return JNI_EINVAL;
2486 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2487 jio_fprintf(defaultStream::error_stream(),
2488 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2489 return JNI_EINVAL;
2490 #endif // !defined(DTRACE_ENABLED)
2491 #ifdef ASSERT
2492 } else if (match_option(option, "-XX:+FullGCALot")) {
2493 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2494 return JNI_EINVAL;
2495 }
2496 #endif
2497 #if !INCLUDE_MANAGEMENT
2498 } else if (match_option(option, "-XX:+ManagementServer")) {
2499 jio_fprintf(defaultStream::error_stream(),
2500 "ManagementServer is not supported in this VM.\n");
2501 return JNI_ERR;
2502 #endif // INCLUDE_MANAGEMENT
2503 #if INCLUDE_JFR
2504 } else if (match_jfr_option(&option)) {
2505 return JNI_EINVAL;
2506 #endif
2507 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2508 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2509 // already been handled
2510 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2511 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2512 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2513 return JNI_EINVAL;
2514 }
2515 }
2516 // Unknown option
2517 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2518 return JNI_ERR;
2519 }
2520 }
2521
2522 // PrintSharedArchiveAndExit will turn on
2523 // -Xshare:on
2524 // -Xlog:class+path=info
2525 if (PrintSharedArchiveAndExit) {
2526 UseSharedSpaces = true;
2527 RequireSharedSpaces = true;
2528 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2529 }
2530
2531 fix_appclasspath();
2532
2533 return JNI_OK;
2534 }
2535
2536 void Arguments::set_ext_dirs(char *value) {
2537 _ext_dirs = os::strdup_check_oom(value);
2538 }
2539
2540 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) {
2541 // For java.base check for duplicate --patch-module options being specified on the command line.
2542 // This check is only required for java.base, all other duplicate module specifications
2543 // will be checked during module system initialization. The module system initialization
2544 // will throw an ExceptionInInitializerError if this situation occurs.
2545 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2546 if (patch_mod_javabase) {
2547 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2548 } else {
2549 patch_mod_javabase = true;
2550 }
2551 }
2552
2553 // Create GrowableArray lazily, only if --patch-module has been specified
2554 if (_patch_mod_prefix == nullptr) {
2555 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2556 }
2557
2558 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2559 }
2560
2561 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2562 //
2563 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2564 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2565 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2566 // path is treated as the current directory.
2567 //
2568 // This causes problems with CDS, which requires that all directories specified in the classpath
2569 // must be empty. In most cases, applications do NOT want to load classes from the current
2570 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2571 // scripts compatible with CDS.
2572 void Arguments::fix_appclasspath() {
2573 if (IgnoreEmptyClassPaths) {
2574 const char separator = *os::path_separator();
2575 const char* src = _java_class_path->value();
2576
2577 // skip over all the leading empty paths
2578 while (*src == separator) {
2579 src ++;
2580 }
2581
2582 char* copy = os::strdup_check_oom(src, mtArguments);
2583
2584 // trim all trailing empty paths
2585 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2586 *tail = '\0';
2587 }
2588
2589 char from[3] = {separator, separator, '\0'};
2590 char to [2] = {separator, '\0'};
2591 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2592 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2593 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2594 }
2595
2596 _java_class_path->set_writeable_value(copy);
2597 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2598 }
2599 }
2600
2601 jint Arguments::finalize_vm_init_args() {
2602 // check if the default lib/endorsed directory exists; if so, error
2603 char path[JVM_MAXPATHLEN];
2604 const char* fileSep = os::file_separator();
2605 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2606
2607 DIR* dir = os::opendir(path);
2608 if (dir != nullptr) {
2609 jio_fprintf(defaultStream::output_stream(),
2610 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2611 "in modular form will be supported via the concept of upgradeable modules.\n");
2612 os::closedir(dir);
2613 return JNI_ERR;
2614 }
2615
2616 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2617 dir = os::opendir(path);
2618 if (dir != nullptr) {
2619 jio_fprintf(defaultStream::output_stream(),
2620 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2621 "Use -classpath instead.\n.");
2622 os::closedir(dir);
2623 return JNI_ERR;
2624 }
2625
2626 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2627 // but like -Xint, leave compilation thresholds unaffected.
2628 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2629 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2630 set_mode_flags(_int);
2631 }
2632
2633 #ifdef ZERO
2634 // Zero always runs in interpreted mode
2635 set_mode_flags(_int);
2636 #endif
2637
2638 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2639 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2640 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2641 }
2642
2643 #ifndef COMPILER2
2644 // Don't degrade server performance for footprint
2645 if (FLAG_IS_DEFAULT(UseLargePages) &&
2646 MaxHeapSize < LargePageHeapSizeThreshold) {
2647 // No need for large granularity pages w/small heaps.
2648 // Note that large pages are enabled/disabled for both the
2649 // Java heap and the code cache.
2650 FLAG_SET_DEFAULT(UseLargePages, false);
2651 }
2652
2653 UNSUPPORTED_OPTION(ProfileInterpreter);
2654 #endif // !COMPILER2
2655
2656 // Parse the CompilationMode flag
2657 if (!CompilationModeFlag::initialize()) {
2658 return JNI_ERR;
2659 }
2660
2661 // Called after ClassLoader::lookup_vm_options() but before class loading begins.
2662 // TODO: Obtain and pass correct preview mode flag value here.
2663 ClassLoader::set_preview_mode(false);
2664
2665 if (!check_vm_args_consistency()) {
2666 return JNI_ERR;
2667 }
2668
2669
2670 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2671 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2672 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2673
2674 return JNI_OK;
2675 }
2676
2677 // Helper class for controlling the lifetime of JavaVMInitArgs
2678 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2679 // deleted on the destruction of the ScopedVMInitArgs object.
2680 class ScopedVMInitArgs : public StackObj {
2681 private:
2682 JavaVMInitArgs _args;
2683 char* _container_name;
2684 bool _is_set;
2685 char* _vm_options_file_arg;
2686
2687 public:
2688 ScopedVMInitArgs(const char *container_name) {
2689 _args.version = JNI_VERSION_1_2;
2690 _args.nOptions = 0;
2691 _args.options = nullptr;
2692 _args.ignoreUnrecognized = false;
2693 _container_name = (char *)container_name;
2694 _is_set = false;
2695 _vm_options_file_arg = nullptr;
2696 }
2697
2698 // Populates the JavaVMInitArgs object represented by this
2699 // ScopedVMInitArgs object with the arguments in options. The
2700 // allocated memory is deleted by the destructor. If this method
2701 // returns anything other than JNI_OK, then this object is in a
2702 // partially constructed state, and should be abandoned.
2703 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
2704 _is_set = true;
2705 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
2706 JavaVMOption, options->length(), mtArguments);
2707 if (options_arr == nullptr) {
2708 return JNI_ENOMEM;
2709 }
2710 _args.options = options_arr;
2711
2712 for (int i = 0; i < options->length(); i++) {
2713 options_arr[i] = options->at(i);
2714 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
2715 if (options_arr[i].optionString == nullptr) {
2716 // Rely on the destructor to do cleanup.
2717 _args.nOptions = i;
2718 return JNI_ENOMEM;
2719 }
2720 }
2721
2722 _args.nOptions = options->length();
2723 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2724 return JNI_OK;
2725 }
2726
2727 JavaVMInitArgs* get() { return &_args; }
2728 char* container_name() { return _container_name; }
2729 bool is_set() { return _is_set; }
2730 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
2731 char* vm_options_file_arg() { return _vm_options_file_arg; }
2732
2733 void set_vm_options_file_arg(const char *vm_options_file_arg) {
2734 if (_vm_options_file_arg != nullptr) {
2735 os::free(_vm_options_file_arg);
2736 }
2737 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
2738 }
2739
2740 ~ScopedVMInitArgs() {
2741 if (_vm_options_file_arg != nullptr) {
2742 os::free(_vm_options_file_arg);
2743 }
2744 if (_args.options == nullptr) return;
2745 for (int i = 0; i < _args.nOptions; i++) {
2746 os::free(_args.options[i].optionString);
2747 }
2748 FREE_C_HEAP_ARRAY(_args.options);
2749 }
2750
2751 // Insert options into this option list, to replace option at
2752 // vm_options_file_pos (-XX:VMOptionsFile)
2753 jint insert(const JavaVMInitArgs* args,
2754 const JavaVMInitArgs* args_to_insert,
2755 const int vm_options_file_pos) {
2756 assert(_args.options == nullptr, "shouldn't be set yet");
2757 assert(args_to_insert->nOptions != 0, "there should be args to insert");
2758 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
2759
2760 int length = args->nOptions + args_to_insert->nOptions - 1;
2761 // Construct new option array
2762 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
2763 for (int i = 0; i < args->nOptions; i++) {
2764 if (i == vm_options_file_pos) {
2765 // insert the new options starting at the same place as the
2766 // -XX:VMOptionsFile option
2767 for (int j = 0; j < args_to_insert->nOptions; j++) {
2768 options.push(args_to_insert->options[j]);
2769 }
2770 } else {
2771 options.push(args->options[i]);
2772 }
2773 }
2774 // make into options array
2775 return set_args(&options);
2776 }
2777 };
2778
2779 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
2780 return parse_options_environment_variable("_JAVA_OPTIONS", args);
2781 }
2782
2783 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
2784 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
2785 }
2786
2787 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) {
2788 for (int index = args->nOptions - 1; index >= 0; index--) {
2789 JavaVMOption* option = args->options + index;
2790 if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) {
2791 return option;
2792 }
2793 }
2794
2795 return nullptr;
2796 }
2797
2798 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args,
2799 ScopedVMInitArgs* jdk_aot_vm_options_args) {
2800 // Don't bother scanning all the args if this env variable is not set
2801 if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) {
2802 return JNI_OK;
2803 }
2804
2805 // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value
2806 // of AOTMode.
2807 JavaVMOption* option = nullptr;
2808 for (int i = all_args->length() - 1; i >= 0; i--) {
2809 if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) {
2810 break;
2811 }
2812 }
2813
2814 if (option != nullptr) {
2815 // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet,
2816 // so its value is not reflected inside the global variable AOTMode.
2817 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) {
2818 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
2819 }
2820 } else {
2821 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode,
2822 // which would have been set inside process_settings_file();
2823 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) {
2824 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
2825 }
2826 }
2827
2828 return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args);
2829 }
2830
2831 jint Arguments::parse_options_environment_variable(const char* name,
2832 ScopedVMInitArgs* vm_args) {
2833 char *buffer = ::getenv(name);
2834
2835 // Don't check this environment variable if user has special privileges
2836 // (e.g. unix su command).
2837 if (buffer == nullptr || os::have_special_privileges()) {
2838 return JNI_OK;
2839 }
2840
2841 if ((buffer = os::strdup(buffer)) == nullptr) {
2842 return JNI_ENOMEM;
2843 }
2844
2845 jio_fprintf(defaultStream::error_stream(),
2846 "Picked up %s: %s\n", name, buffer);
2847
2848 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
2849
2850 os::free(buffer);
2851 return retcode;
2852 }
2853
2854 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
2855 // read file into buffer
2856 int fd = ::open(file_name, O_RDONLY);
2857 if (fd < 0) {
2858 jio_fprintf(defaultStream::error_stream(),
2859 "Could not open options file '%s'\n",
2860 file_name);
2861 return JNI_ERR;
2862 }
2863
2864 struct stat stbuf;
2865 int retcode = os::stat(file_name, &stbuf);
2866 if (retcode != 0) {
2867 jio_fprintf(defaultStream::error_stream(),
2868 "Could not stat options file '%s'\n",
2869 file_name);
2870 ::close(fd);
2871 return JNI_ERR;
2872 }
2873
2874 if (stbuf.st_size == 0) {
2875 // tell caller there is no option data and that is ok
2876 ::close(fd);
2877 return JNI_OK;
2878 }
2879
2880 // '+ 1' for null termination even with max bytes
2881 size_t bytes_alloc = stbuf.st_size + 1;
2882
2883 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
2884 if (nullptr == buf) {
2885 jio_fprintf(defaultStream::error_stream(),
2886 "Could not allocate read buffer for options file parse\n");
2887 ::close(fd);
2888 return JNI_ENOMEM;
2889 }
2890
2891 memset(buf, 0, bytes_alloc);
2892
2893 // Fill buffer
2894 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
2895 ::close(fd);
2896 if (bytes_read < 0) {
2897 FREE_C_HEAP_ARRAY(buf);
2898 jio_fprintf(defaultStream::error_stream(),
2899 "Could not read options file '%s'\n", file_name);
2900 return JNI_ERR;
2901 }
2902
2903 if (bytes_read == 0) {
2904 // tell caller there is no option data and that is ok
2905 FREE_C_HEAP_ARRAY(buf);
2906 return JNI_OK;
2907 }
2908
2909 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
2910
2911 FREE_C_HEAP_ARRAY(buf);
2912 return retcode;
2913 }
2914
2915 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
2916 // Construct option array
2917 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
2918
2919 // some pointers to help with parsing
2920 char *buffer_end = buffer + buf_len;
2921 char *opt_hd = buffer;
2922 char *wrt = buffer;
2923 char *rd = buffer;
2924
2925 // parse all options
2926 while (rd < buffer_end) {
2927 // skip leading white space from the input string
2928 while (rd < buffer_end && isspace((unsigned char) *rd)) {
2929 rd++;
2930 }
2931
2932 if (rd >= buffer_end) {
2933 break;
2934 }
2935
2936 // Remember this is where we found the head of the token.
2937 opt_hd = wrt;
2938
2939 // Tokens are strings of non white space characters separated
2940 // by one or more white spaces.
2941 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
2942 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2943 int quote = *rd; // matching quote to look for
2944 rd++; // don't copy open quote
2945 while (rd < buffer_end && *rd != quote) {
2946 // include everything (even spaces)
2947 // up until the close quote
2948 *wrt++ = *rd++; // copy to option string
2949 }
2950
2951 if (rd < buffer_end) {
2952 rd++; // don't copy close quote
2953 } else {
2954 // did not see closing quote
2955 jio_fprintf(defaultStream::error_stream(),
2956 "Unmatched quote in %s\n", name);
2957 return JNI_ERR;
2958 }
2959 } else {
2960 *wrt++ = *rd++; // copy to option string
2961 }
2962 }
2963
2964 // steal a white space character and set it to null
2965 *wrt++ = '\0';
2966 // We now have a complete token
2967
2968 JavaVMOption option;
2969 option.optionString = opt_hd;
2970 option.extraInfo = nullptr;
2971
2972 options.append(option); // Fill in option
2973
2974 rd++; // Advance to next character
2975 }
2976
2977 // Fill out JavaVMInitArgs structure.
2978 return vm_args->set_args(&options);
2979 }
2980
2981 #ifndef PRODUCT
2982 // Determine whether LogVMOutput should be implicitly turned on.
2983 static bool use_vm_log() {
2984 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
2985 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
2986 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
2987 PrintAssembly || TraceDeoptimization ||
2988 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
2989 return true;
2990 }
2991
2992 #ifdef COMPILER1
2993 if (PrintC1Statistics) {
2994 return true;
2995 }
2996 #endif // COMPILER1
2997
2998 #ifdef COMPILER2
2999 if (PrintOptoAssembly || PrintOptoStatistics) {
3000 return true;
3001 }
3002 #endif // COMPILER2
3003
3004 return false;
3005 }
3006
3007 #endif // PRODUCT
3008
3009 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3010 for (int index = 0; index < args->nOptions; index++) {
3011 const JavaVMOption* option = args->options + index;
3012 const char* tail;
3013 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3014 return true;
3015 }
3016 }
3017 return false;
3018 }
3019
3020 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3021 const char* vm_options_file,
3022 const int vm_options_file_pos,
3023 ScopedVMInitArgs* vm_options_file_args,
3024 ScopedVMInitArgs* args_out) {
3025 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3026 if (code != JNI_OK) {
3027 return code;
3028 }
3029
3030 if (vm_options_file_args->get()->nOptions < 1) {
3031 return JNI_OK;
3032 }
3033
3034 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3035 jio_fprintf(defaultStream::error_stream(),
3036 "A VM options file may not refer to a VM options file. "
3037 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3038 "options file '%s' in options container '%s' is an error.\n",
3039 vm_options_file_args->vm_options_file_arg(),
3040 vm_options_file_args->container_name());
3041 return JNI_EINVAL;
3042 }
3043
3044 return args_out->insert(args, vm_options_file_args->get(),
3045 vm_options_file_pos);
3046 }
3047
3048 // Expand -XX:VMOptionsFile found in args_in as needed.
3049 // mod_args and args_out parameters may return values as needed.
3050 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3051 ScopedVMInitArgs* mod_args,
3052 JavaVMInitArgs** args_out) {
3053 jint code = match_special_option_and_act(args_in, mod_args);
3054 if (code != JNI_OK) {
3055 return code;
3056 }
3057
3058 if (mod_args->is_set()) {
3059 // args_in contains -XX:VMOptionsFile and mod_args contains the
3060 // original options from args_in along with the options expanded
3061 // from the VMOptionsFile. Return a short-hand to the caller.
3062 *args_out = mod_args->get();
3063 } else {
3064 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3065 }
3066 return JNI_OK;
3067 }
3068
3069 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3070 ScopedVMInitArgs* args_out) {
3071 // Remaining part of option string
3072 const char* tail;
3073 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3074
3075 for (int index = 0; index < args->nOptions; index++) {
3076 const JavaVMOption* option = args->options + index;
3077 if (match_option(option, "-XX:Flags=", &tail)) {
3078 Arguments::set_jvm_flags_file(tail);
3079 continue;
3080 }
3081 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3082 if (vm_options_file_args.found_vm_options_file_arg()) {
3083 jio_fprintf(defaultStream::error_stream(),
3084 "The option '%s' is already specified in the options "
3085 "container '%s' so the specification of '%s' in the "
3086 "same options container is an error.\n",
3087 vm_options_file_args.vm_options_file_arg(),
3088 vm_options_file_args.container_name(),
3089 option->optionString);
3090 return JNI_EINVAL;
3091 }
3092 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3093 // If there's a VMOptionsFile, parse that
3094 jint code = insert_vm_options_file(args, tail, index,
3095 &vm_options_file_args, args_out);
3096 if (code != JNI_OK) {
3097 return code;
3098 }
3099 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3100 if (args_out->is_set()) {
3101 // The VMOptions file inserted some options so switch 'args'
3102 // to the new set of options, and continue processing which
3103 // preserves "last option wins" semantics.
3104 args = args_out->get();
3105 // The first option from the VMOptionsFile replaces the
3106 // current option. So we back track to process the
3107 // replacement option.
3108 index--;
3109 }
3110 continue;
3111 }
3112 if (match_option(option, "-XX:+PrintVMOptions")) {
3113 PrintVMOptions = true;
3114 continue;
3115 }
3116 if (match_option(option, "-XX:-PrintVMOptions")) {
3117 PrintVMOptions = false;
3118 continue;
3119 }
3120 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3121 IgnoreUnrecognizedVMOptions = true;
3122 continue;
3123 }
3124 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3125 IgnoreUnrecognizedVMOptions = false;
3126 continue;
3127 }
3128 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3129 JVMFlag::printFlags(tty, false);
3130 vm_exit(0);
3131 }
3132
3133 #ifndef PRODUCT
3134 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3135 JVMFlag::printFlags(tty, true);
3136 vm_exit(0);
3137 }
3138 #endif
3139 }
3140 return JNI_OK;
3141 }
3142
3143 static void print_options(const JavaVMInitArgs *args) {
3144 const char* tail;
3145 for (int index = 0; index < args->nOptions; index++) {
3146 const JavaVMOption *option = args->options + index;
3147 if (match_option(option, "-XX:", &tail)) {
3148 logOption(tail);
3149 }
3150 }
3151 }
3152
3153 bool Arguments::handle_deprecated_print_gc_flags() {
3154 if (PrintGC) {
3155 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3156 }
3157 if (PrintGCDetails) {
3158 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3159 }
3160
3161 if (_legacyGCLogging.lastFlag == 2) {
3162 // -Xloggc was used to specify a filename
3163 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3164
3165 LogTarget(Error, logging) target;
3166 LogStream errstream(target);
3167 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3168 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3169 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3170 }
3171 return true;
3172 }
3173
3174 static void apply_debugger_ergo() {
3175 #ifdef ASSERT
3176 if (ReplayCompiles) {
3177 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3178 }
3179
3180 if (UseDebuggerErgo) {
3181 // Turn on sub-flags
3182 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3183 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3184 }
3185
3186 if (UseDebuggerErgo2) {
3187 // Debugging with limited number of CPUs
3188 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3189 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3190 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3191 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3192 }
3193 #endif // ASSERT
3194 }
3195
3196 // Parse entry point called from JNI_CreateJavaVM
3197
3198 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3199 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3200 JVMFlag::check_all_flag_declarations();
3201
3202 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3203 const char* hotspotrc = ".hotspotrc";
3204 bool settings_file_specified = false;
3205 bool needs_hotspotrc_warning = false;
3206 ScopedVMInitArgs initial_vm_options_args("");
3207 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3208 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3209 ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'");
3210
3211 // Pointers to current working set of containers
3212 JavaVMInitArgs* cur_cmd_args;
3213 JavaVMInitArgs* cur_vm_options_args;
3214 JavaVMInitArgs* cur_java_options_args;
3215 JavaVMInitArgs* cur_java_tool_options_args;
3216 JavaVMInitArgs* cur_jdk_aot_vm_options_args;
3217
3218 // Containers for modified/expanded options
3219 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3220 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3221 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3222 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3223 ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'");
3224
3225 GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args;
3226
3227 jint code =
3228 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3229 if (code != JNI_OK) {
3230 return code;
3231 }
3232
3233 // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM.
3234 // This is an undocumented feature.
3235 code = parse_java_options_environment_variable(&initial_java_options_args);
3236 if (code != JNI_OK) {
3237 return code;
3238 }
3239
3240 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3241 char *vmoptions = ClassLoader::lookup_vm_options();
3242 if (vmoptions != nullptr) {
3243 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3244 FREE_C_HEAP_ARRAY(vmoptions);
3245 if (code != JNI_OK) {
3246 return code;
3247 }
3248 }
3249
3250 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3251 &mod_java_tool_options_args,
3252 &cur_java_tool_options_args);
3253 if (code != JNI_OK) {
3254 return code;
3255 }
3256
3257 code = expand_vm_options_as_needed(initial_cmd_args,
3258 &mod_cmd_args,
3259 &cur_cmd_args);
3260 if (code != JNI_OK) {
3261 return code;
3262 }
3263
3264 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3265 &mod_java_options_args,
3266 &cur_java_options_args);
3267 if (code != JNI_OK) {
3268 return code;
3269 }
3270
3271 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3272 &mod_vm_options_args,
3273 &cur_vm_options_args);
3274 if (code != JNI_OK) {
3275 return code;
3276 }
3277
3278 const char* flags_file = Arguments::get_jvm_flags_file();
3279 settings_file_specified = (flags_file != nullptr);
3280
3281 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags.
3282 if (settings_file_specified) {
3283 if (!process_settings_file(flags_file, true,
3284 IgnoreUnrecognizedVMOptions)) {
3285 return JNI_EINVAL;
3286 }
3287 } else {
3288 #ifdef ASSERT
3289 // Parse default .hotspotrc settings file
3290 if (!process_settings_file(".hotspotrc", false,
3291 IgnoreUnrecognizedVMOptions)) {
3292 return JNI_EINVAL;
3293 }
3294 #else
3295 struct stat buf;
3296 if (os::stat(hotspotrc, &buf) == 0) {
3297 needs_hotspotrc_warning = true;
3298 }
3299 #endif
3300 }
3301
3302 // The settings in the args are applied in this order to the the JVM global flags.
3303 // For historical reasons, the order is DIFFERENT than the scanning order of
3304 // the above expand_vm_options_as_needed() calls.
3305 all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE});
3306 all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR});
3307 all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE});
3308 all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR});
3309
3310 // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all
3311 // the options that have been gathered above.
3312 code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args);
3313 if (code != JNI_OK) {
3314 return code;
3315 }
3316 code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(),
3317 &mod_jdk_aot_vm_options_args,
3318 &cur_jdk_aot_vm_options_args);
3319 if (code != JNI_OK) {
3320 return code;
3321 }
3322
3323 for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) {
3324 JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index;
3325 const char* optionString = option->optionString;
3326 if (strstr(optionString, "-XX:AOTMode=") == optionString &&
3327 strcmp(optionString, "-XX:AOTMode=create") != 0) {
3328 jio_fprintf(defaultStream::error_stream(),
3329 "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString);
3330 return JNI_ERR;
3331 }
3332 }
3333
3334 all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR});
3335
3336 if (IgnoreUnrecognizedVMOptions) {
3337 // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of
3338 // the JDK so it shouldn't have bad options.
3339 cur_cmd_args->ignoreUnrecognized = true;
3340 cur_java_tool_options_args->ignoreUnrecognized = true;
3341 cur_java_options_args->ignoreUnrecognized = true;
3342 cur_jdk_aot_vm_options_args->ignoreUnrecognized = true;
3343 }
3344
3345 if (PrintVMOptions) {
3346 // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed.
3347 print_options(cur_java_tool_options_args);
3348 print_options(cur_cmd_args);
3349 print_options(cur_java_options_args);
3350 print_options(cur_jdk_aot_vm_options_args);
3351 }
3352
3353 // Apply the settings in these args to the JVM global flags.
3354 jint result = parse_vm_init_args(&all_args);
3355
3356 if (result != JNI_OK) {
3357 return result;
3358 }
3359
3360 // Delay warning until here so that we've had a chance to process
3361 // the -XX:-PrintWarnings flag
3362 if (needs_hotspotrc_warning) {
3363 warning("%s file is present but has been ignored. "
3364 "Run with -XX:Flags=%s to load the file.",
3365 hotspotrc, hotspotrc);
3366 }
3367
3368 if (needs_module_property_warning) {
3369 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3370 " names that are reserved for internal use.");
3371 }
3372
3373 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3374 UNSUPPORTED_OPTION(UseLargePages);
3375 #endif
3376
3377 #if defined(AIX)
3378 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3379 #endif
3380
3381 #ifndef PRODUCT
3382 if (TraceBytecodesAt != 0) {
3383 TraceBytecodes = true;
3384 }
3385 #endif // PRODUCT
3386
3387 if (ScavengeRootsInCode == 0) {
3388 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3389 warning("Forcing ScavengeRootsInCode non-zero");
3390 }
3391 ScavengeRootsInCode = 1;
3392 }
3393
3394 if (!handle_deprecated_print_gc_flags()) {
3395 return JNI_EINVAL;
3396 }
3397
3398 // Set object alignment values.
3399 set_object_alignment();
3400
3401 #if !INCLUDE_CDS
3402 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3403 jio_fprintf(defaultStream::error_stream(),
3404 "Shared spaces are not supported in this VM\n");
3405 return JNI_ERR;
3406 }
3407 if (DumpLoadedClassList != nullptr) {
3408 jio_fprintf(defaultStream::error_stream(),
3409 "DumpLoadedClassList is not supported in this VM\n");
3410 return JNI_ERR;
3411 }
3412 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3413 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) {
3414 warning("Shared spaces are not supported in this VM");
3415 UseSharedSpaces = false;
3416 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3417 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot));
3418 }
3419 no_shared_spaces("CDS Disabled");
3420 #endif // INCLUDE_CDS
3421
3422 // Verify NMT arguments
3423 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3424 if (lvl == NMT_unknown) {
3425 jio_fprintf(defaultStream::error_stream(),
3426 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3427 return JNI_ERR;
3428 }
3429 if (PrintNMTStatistics && lvl == NMT_off) {
3430 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3431 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3432 }
3433
3434 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3435 if (trace_dependencies && VerifyDependencies) {
3436 warning("dependency logging results may be inflated by VerifyDependencies");
3437 }
3438
3439 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3440 log_is_enabled(Info, class, load, cause);
3441 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3442 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3443 }
3444
3445 apply_debugger_ergo();
3446
3447 // The VMThread needs to stop now and then to execute these debug options.
3448 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3449 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3450 }
3451
3452 if (log_is_enabled(Info, arguments)) {
3453 LogStream st(Log(arguments)::info());
3454 Arguments::print_on(&st);
3455 }
3456
3457 return JNI_OK;
3458 }
3459
3460 void Arguments::set_compact_headers_flags() {
3461 #ifdef _LP64
3462 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3463 if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3464 warning("-UseObjectMonitorTable is incompatible with +UseCompactObjectHeaders; ignoring -UseObjectMonitorTable");
3465 }
3466 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3467 }
3468 #endif
3469 }
3470
3471 jint Arguments::apply_ergo() {
3472 // Set flags based on ergonomics.
3473 jint result = set_ergonomics_flags();
3474 if (result != JNI_OK) return result;
3475
3476 // Set heap size based on available physical memory
3477 GCConfig::arguments()->set_heap_size();
3478
3479 GCConfig::arguments()->initialize();
3480
3481 set_compact_headers_flags();
3482
3483 CompressedKlassPointers::pre_initialize();
3484
3485 CDSConfig::ergo_initialize();
3486
3487 // Initialize Metaspace flags and alignments
3488 Metaspace::ergo_initialize();
3489
3490 if (!StringDedup::ergo_initialize()) {
3491 return JNI_EINVAL;
3492 }
3493
3494 // Set compiler flags after GC is selected and GC specific
3495 // flags (LoopStripMiningIter) are set.
3496 CompilerConfig::ergo_initialize();
3497
3498 // Set bytecode rewriting flags
3499 set_bytecode_flags();
3500
3501 // Set flags if aggressive optimization flags are enabled
3502 jint code = set_aggressive_opts_flags();
3503 if (code != JNI_OK) {
3504 return code;
3505 }
3506
3507 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3508 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3509 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3510 warning("UseSecondarySupersTable is not supported");
3511 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3512 }
3513 if (!UseSecondarySupersTable) {
3514 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3515 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3516 }
3517
3518 #ifdef ZERO
3519 // Clear flags not supported on zero.
3520 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3521 #endif // ZERO
3522
3523 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3524 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3525 DebugNonSafepoints = true;
3526 }
3527
3528 // Treat the odd case where local verification is enabled but remote
3529 // verification is not as if both were enabled.
3530 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3531 log_info(verification)("Turning on remote verification because local verification is on");
3532 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3533 }
3534
3535 #ifndef PRODUCT
3536 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3537 if (use_vm_log()) {
3538 LogVMOutput = true;
3539 }
3540 }
3541 #endif // PRODUCT
3542
3543 if (PrintCommandLineFlags) {
3544 JVMFlag::printSetFlags(tty);
3545 }
3546
3547 #ifdef COMPILER2
3548 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3549 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3550 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3551 }
3552 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3553
3554 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3555 if (!EnableVectorReboxing) {
3556 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3557 } else {
3558 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3559 }
3560 }
3561 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3562 }
3563
3564 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
3565 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
3566 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
3567 }
3568 #endif // COMPILER2
3569
3570 if (log_is_enabled(Info, perf, class, link)) {
3571 if (!UsePerfData) {
3572 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3573 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
3574 assert(!log_is_enabled(Info, perf, class, link), "sanity");
3575 }
3576 }
3577
3578 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3579 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3580 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3581 }
3582 }
3583 return JNI_OK;
3584 }
3585
3586 jint Arguments::adjust_after_os() {
3587 if (UseNUMA) {
3588 if (UseParallelGC) {
3589 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3590 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3591 }
3592 }
3593 }
3594 return JNI_OK;
3595 }
3596
3597 int Arguments::PropertyList_count(SystemProperty* pl) {
3598 int count = 0;
3599 while(pl != nullptr) {
3600 count++;
3601 pl = pl->next();
3602 }
3603 return count;
3604 }
3605
3606 // Return the number of readable properties.
3607 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3608 int count = 0;
3609 while(pl != nullptr) {
3610 if (pl->readable()) {
3611 count++;
3612 }
3613 pl = pl->next();
3614 }
3615 return count;
3616 }
3617
3618 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3619 assert(key != nullptr, "just checking");
3620 SystemProperty* prop;
3621 for (prop = pl; prop != nullptr; prop = prop->next()) {
3622 if (strcmp(key, prop->key()) == 0) return prop->value();
3623 }
3624 return nullptr;
3625 }
3626
3627 // Return the value of the requested property provided that it is a readable property.
3628 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3629 assert(key != nullptr, "just checking");
3630 SystemProperty* prop;
3631 // Return the property value if the keys match and the property is not internal or
3632 // it's the special internal property "jdk.boot.class.path.append".
3633 for (prop = pl; prop != nullptr; prop = prop->next()) {
3634 if (strcmp(key, prop->key()) == 0) {
3635 if (!prop->internal()) {
3636 return prop->value();
3637 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3638 return prop->value();
3639 } else {
3640 // Property is internal and not jdk.boot.class.path.append so return null.
3641 return nullptr;
3642 }
3643 }
3644 }
3645 return nullptr;
3646 }
3647
3648 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3649 SystemProperty* p = *plist;
3650 if (p == nullptr) {
3651 *plist = new_p;
3652 } else {
3653 while (p->next() != nullptr) {
3654 p = p->next();
3655 }
3656 p->set_next(new_p);
3657 }
3658 }
3659
3660 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3661 bool writeable, bool internal) {
3662 if (plist == nullptr)
3663 return;
3664
3665 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3666 PropertyList_add(plist, new_p);
3667 }
3668
3669 void Arguments::PropertyList_add(SystemProperty *element) {
3670 PropertyList_add(&_system_properties, element);
3671 }
3672
3673 // This add maintains unique property key in the list.
3674 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3675 PropertyAppendable append, PropertyWriteable writeable,
3676 PropertyInternal internal) {
3677 if (plist == nullptr)
3678 return;
3679
3680 // If property key exists and is writeable, then update with new value.
3681 // Trying to update a non-writeable property is silently ignored.
3682 SystemProperty* prop;
3683 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3684 if (strcmp(k, prop->key()) == 0) {
3685 if (append == AppendProperty) {
3686 prop->append_writeable_value(v);
3687 } else {
3688 prop->set_writeable_value(v);
3689 }
3690 return;
3691 }
3692 }
3693
3694 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3695 }
3696
3697 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3698 // Returns true if all of the source pointed by src has been copied over to
3699 // the destination buffer pointed by buf. Otherwise, returns false.
3700 // Notes:
3701 // 1. If the length (buflen) of the destination buffer excluding the
3702 // null terminator character is not long enough for holding the expanded
3703 // pid characters, it also returns false instead of returning the partially
3704 // expanded one.
3705 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3706 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3707 char* buf, size_t buflen) {
3708 const char* p = src;
3709 char* b = buf;
3710 const char* src_end = &src[srclen];
3711 char* buf_end = &buf[buflen - 1];
3712
3713 while (p < src_end && b < buf_end) {
3714 if (*p == '%') {
3715 switch (*(++p)) {
3716 case '%': // "%%" ==> "%"
3717 *b++ = *p++;
3718 break;
3719 case 'p': { // "%p" ==> current process id
3720 // buf_end points to the character before the last character so
3721 // that we could write '\0' to the end of the buffer.
3722 size_t buf_sz = buf_end - b + 1;
3723 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3724
3725 // if jio_snprintf fails or the buffer is not long enough to hold
3726 // the expanded pid, returns false.
3727 if (ret < 0 || ret >= (int)buf_sz) {
3728 return false;
3729 } else {
3730 b += ret;
3731 assert(*b == '\0', "fail in copy_expand_pid");
3732 if (p == src_end && b == buf_end + 1) {
3733 // reach the end of the buffer.
3734 return true;
3735 }
3736 }
3737 p++;
3738 break;
3739 }
3740 default :
3741 *b++ = '%';
3742 }
3743 } else {
3744 *b++ = *p++;
3745 }
3746 }
3747 *b = '\0';
3748 return (p == src_end); // return false if not all of the source was copied
3749 }