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/genArguments.hpp"
39 #include "gc/shared/stringdedup/stringDedup.hpp"
40 #include "gc/shared/tlab_globals.hpp"
41 #include "jvm.h"
42 #include "logging/log.hpp"
43 #include "logging/logConfiguration.hpp"
44 #include "logging/logStream.hpp"
45 #include "logging/logTag.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "nmt/nmtCommon.hpp"
48 #include "oops/compressedKlass.hpp"
49 #include "oops/instanceKlass.hpp"
50 #include "oops/objLayout.hpp"
51 #include "oops/oop.inline.hpp"
52 #include "prims/jvmtiAgentList.hpp"
53 #include "prims/jvmtiExport.hpp"
54 #include "runtime/arguments.hpp"
55 #include "runtime/flags/jvmFlag.hpp"
56 #include "runtime/flags/jvmFlagAccess.hpp"
57 #include "runtime/flags/jvmFlagLimit.hpp"
58 #include "runtime/globals.hpp"
59 #include "runtime/globals_extension.hpp"
60 #include "runtime/java.hpp"
61 #include "runtime/os.hpp"
62 #include "runtime/safepoint.hpp"
63 #include "runtime/safepointMechanism.hpp"
64 #include "runtime/synchronizer.hpp"
65 #include "runtime/vm_version.hpp"
66 #include "services/management.hpp"
67 #include "utilities/align.hpp"
68 #include "utilities/debug.hpp"
69 #include "utilities/defaultStream.hpp"
70 #include "utilities/macros.hpp"
71 #include "utilities/parseInteger.hpp"
72 #include "utilities/powerOfTwo.hpp"
73 #include "utilities/stringUtils.hpp"
74 #include "utilities/systemMemoryBarrier.hpp"
75 #if INCLUDE_JFR
76 #include "jfr/jfr.hpp"
77 #endif
78
79 #include <string.h>
80
81 static const char _default_java_launcher[] = "generic";
82
83 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
84
85 char* Arguments::_jvm_flags_file = nullptr;
86 char** Arguments::_jvm_flags_array = nullptr;
87 int Arguments::_num_jvm_flags = 0;
88 char** Arguments::_jvm_args_array = nullptr;
89 int Arguments::_num_jvm_args = 0;
90 unsigned int Arguments::_addmods_count = 0;
91 #if INCLUDE_JVMCI
92 bool Arguments::_jvmci_module_added = false;
93 #endif
94 char* Arguments::_java_command = nullptr;
95 SystemProperty* Arguments::_system_properties = nullptr;
96 size_t Arguments::_conservative_max_heap_alignment = 0;
97 Arguments::Mode Arguments::_mode = _mixed;
98 const char* Arguments::_java_vendor_url_bug = nullptr;
99 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
100 bool Arguments::_executing_unit_tests = false;
101
102 // These parameters are reset in method parse_vm_init_args()
103 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
104 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
105 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
106 bool Arguments::_ClipInlining = ClipInlining;
107 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
108
109 bool Arguments::_enable_preview = false;
110 bool Arguments::_has_jdwp_agent = false;
111
112 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
113
114 // These are not set by the JDK's built-in launchers, but they can be set by
115 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
116 // JavaVMOption in jni.h.
117 abort_hook_t Arguments::_abort_hook = nullptr;
118 exit_hook_t Arguments::_exit_hook = nullptr;
119 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
120
121
122 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
123 SystemProperty *Arguments::_java_library_path = nullptr;
124 SystemProperty *Arguments::_java_home = nullptr;
125 SystemProperty *Arguments::_java_class_path = nullptr;
126 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
127 SystemProperty *Arguments::_vm_info = nullptr;
128
129 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
130 PathString *Arguments::_boot_class_path = nullptr;
131 bool Arguments::_has_jimage = false;
132
133 char* Arguments::_ext_dirs = nullptr;
134
135 // True if -Xshare:auto option was specified.
136 static bool xshare_auto_cmd_line = false;
137
138 // True if -Xint/-Xmixed/-Xcomp were specified
139 static bool mode_flag_cmd_line = false;
140
141 struct VMInitArgsGroup {
142 const JavaVMInitArgs* _args;
143 JVMFlagOrigin _origin;
144 };
145
146 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
147 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
148 if (new_value == nullptr) {
149 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
150 return false;
151 }
152 if (_value != nullptr) {
153 FreeHeap(_value);
154 }
155 _value = new_value;
156 strcpy(_value, value);
157 return true;
158 }
159
160 void PathString::append_value(const char *value) {
161 char *sp;
162 size_t len = 0;
163 if (value != nullptr) {
164 len = strlen(value);
165 if (_value != nullptr) {
166 len += strlen(_value);
167 }
168 sp = AllocateHeap(len+2, mtArguments);
169 assert(sp != nullptr, "Unable to allocate space for new append path value");
170 if (sp != nullptr) {
171 if (_value != nullptr) {
172 strcpy(sp, _value);
173 strcat(sp, os::path_separator());
174 strcat(sp, value);
175 FreeHeap(_value);
176 } else {
177 strcpy(sp, value);
178 }
179 _value = sp;
180 }
181 }
182 }
183
184 PathString::PathString(const char* value) {
185 if (value == nullptr) {
186 _value = nullptr;
187 } else {
188 _value = AllocateHeap(strlen(value)+1, mtArguments);
189 strcpy(_value, value);
190 }
191 }
192
193 PathString::~PathString() {
194 if (_value != nullptr) {
195 FreeHeap(_value);
196 _value = nullptr;
197 }
198 }
199
200 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
201 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
202 size_t len = strlen(module_name) + 1;
203 _module_name = AllocateHeap(len, mtInternal);
204 strncpy(_module_name, module_name, len); // copy the trailing null
205 _path = new PathString(path);
206 }
207
208 ModulePatchPath::~ModulePatchPath() {
209 if (_module_name != nullptr) {
210 FreeHeap(_module_name);
211 _module_name = nullptr;
212 }
213 if (_path != nullptr) {
214 delete _path;
215 _path = nullptr;
216 }
217 }
218
219 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
220 if (key == nullptr) {
221 _key = nullptr;
222 } else {
223 _key = AllocateHeap(strlen(key)+1, mtArguments);
224 strcpy(_key, key);
225 }
226 _next = nullptr;
227 _internal = internal;
228 _writeable = writeable;
229 }
230
231 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
232 // part of the option string.
233 static bool match_option(const JavaVMOption *option, const char* name,
234 const char** tail) {
235 size_t len = strlen(name);
236 if (strncmp(option->optionString, name, len) == 0) {
237 *tail = option->optionString + len;
238 return true;
239 } else {
240 return false;
241 }
242 }
243
244 // Check if 'option' matches 'name'. No "tail" is allowed.
245 static bool match_option(const JavaVMOption *option, const char* name) {
246 const char* tail = nullptr;
247 bool result = match_option(option, name, &tail);
248 if (tail != nullptr && *tail == '\0') {
249 return result;
250 } else {
251 return false;
252 }
253 }
254
255 // Return true if any of the strings in null-terminated array 'names' matches.
256 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
257 // the option must match exactly.
258 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
259 bool tail_allowed) {
260 for (/* empty */; *names != nullptr; ++names) {
261 if (match_option(option, *names, tail)) {
262 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
263 return true;
264 }
265 }
266 }
267 return false;
268 }
269
270 #if INCLUDE_JFR
271 static bool _has_jfr_option = false; // is using JFR
272
273 // return true on failure
274 static bool match_jfr_option(const JavaVMOption** option) {
275 assert((*option)->optionString != nullptr, "invariant");
276 char* tail = nullptr;
277 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
278 _has_jfr_option = true;
279 return Jfr::on_start_flight_recording_option(option, tail);
280 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
281 _has_jfr_option = true;
282 return Jfr::on_flight_recorder_option(option, tail);
283 }
284 return false;
285 }
286
287 bool Arguments::has_jfr_option() {
288 return _has_jfr_option;
289 }
290 #endif
291
292 static void logOption(const char* opt) {
293 if (PrintVMOptions) {
294 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
295 }
296 }
297
298 bool needs_module_property_warning = false;
299
300 #define MODULE_PROPERTY_PREFIX "jdk.module."
301 #define MODULE_PROPERTY_PREFIX_LEN 11
302 #define ADDEXPORTS "addexports"
303 #define ADDEXPORTS_LEN 10
304 #define ADDREADS "addreads"
305 #define ADDREADS_LEN 8
306 #define ADDOPENS "addopens"
307 #define ADDOPENS_LEN 8
308 #define PATCH "patch"
309 #define PATCH_LEN 5
310 #define ADDMODS "addmods"
311 #define ADDMODS_LEN 7
312 #define LIMITMODS "limitmods"
313 #define LIMITMODS_LEN 9
314 #define PATH "path"
315 #define PATH_LEN 4
316 #define UPGRADE_PATH "upgrade.path"
317 #define UPGRADE_PATH_LEN 12
318 #define ENABLE_NATIVE_ACCESS "enable.native.access"
319 #define ENABLE_NATIVE_ACCESS_LEN 20
320 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
321 #define ILLEGAL_NATIVE_ACCESS_LEN 21
322 #define ENABLE_FINAL_FIELD_MUTATION "enable.final.field.mutation"
323 #define ENABLE_FINAL_FIELD_MUTATION_LEN 27
324 #define ILLEGAL_FINAL_FIELD_MUTATION "illegal.final.field.mutation"
325 #define ILLEGAL_FINAL_FIELD_MUTATION_LEN 28
326
327 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
328 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
329 return ((strncmp(option, property, len) == 0) &&
330 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
331 }
332
333 // Return true if property starts with "jdk.module." and its ensuing chars match
334 // any of the reserved module properties.
335 // property should be passed without the leading "-D".
336 bool Arguments::is_internal_module_property(const char* property) {
337 return internal_module_property_helper(property, false);
338 }
339
340 // Returns true if property is one of those recognized by is_internal_module_property() but
341 // is not supported by CDS archived full module graph.
342 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
343 return internal_module_property_helper(property, true);
344 }
345
346 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
347 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
348 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
349 if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
350 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
351 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
352 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN) ||
353 matches_property_suffix(property_suffix, ENABLE_FINAL_FIELD_MUTATION, ENABLE_FINAL_FIELD_MUTATION_LEN) ||
354 matches_property_suffix(property_suffix, ILLEGAL_FINAL_FIELD_MUTATION, ILLEGAL_FINAL_FIELD_MUTATION_LEN)) {
355 return true;
356 }
357
358 if (!check_for_cds) {
359 // CDS notes: these properties are supported by CDS archived full module graph.
360 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
361 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
362 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
363 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
364 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
365 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
366 return true;
367 }
368 }
369 }
370 return false;
371 }
372
373 // Process java launcher properties.
374 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
375 // See if sun.java.launcher is defined.
376 // Must do this before setting up other system properties,
377 // as some of them may depend on launcher type.
378 for (int index = 0; index < args->nOptions; index++) {
379 const JavaVMOption* option = args->options + index;
380 const char* tail;
381
382 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
383 process_java_launcher_argument(tail, option->extraInfo);
384 continue;
385 }
386 if (match_option(option, "-XX:+ExecutingUnitTests")) {
387 _executing_unit_tests = true;
388 continue;
389 }
390 }
391 }
392
393 // Initialize system properties key and value.
394 void Arguments::init_system_properties() {
395
396 // Set up _boot_class_path which is not a property but
397 // relies heavily on argument processing and the jdk.boot.class.path.append
398 // property. It is used to store the underlying boot class path.
399 _boot_class_path = new PathString(nullptr);
400
401 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
402 "Java Virtual Machine Specification", false));
403 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
404 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
405 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
406
407 // Initialize the vm.info now, but it will need updating after argument parsing.
408 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
409
410 // Following are JVMTI agent writable properties.
411 // Properties values are set to nullptr and they are
412 // os specific they are initialized in os::init_system_properties_values().
413 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
414 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
415 _java_home = new SystemProperty("java.home", nullptr, true);
416 _java_class_path = new SystemProperty("java.class.path", "", true);
417 // jdk.boot.class.path.append is a non-writeable, internal property.
418 // It can only be set by either:
419 // - -Xbootclasspath/a:
420 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
421 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
422
423 // Add to System Property list.
424 PropertyList_add(&_system_properties, _sun_boot_library_path);
425 PropertyList_add(&_system_properties, _java_library_path);
426 PropertyList_add(&_system_properties, _java_home);
427 PropertyList_add(&_system_properties, _java_class_path);
428 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
429 PropertyList_add(&_system_properties, _vm_info);
430
431 // Set OS specific system properties values
432 os::init_system_properties_values();
433 }
434
435 // Update/Initialize System properties after JDK version number is known
436 void Arguments::init_version_specific_system_properties() {
437 enum { bufsz = 16 };
438 char buffer[bufsz];
439 const char* spec_vendor = "Oracle Corporation";
440 uint32_t spec_version = JDK_Version::current().major_version();
441
442 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
443
444 PropertyList_add(&_system_properties,
445 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
446 PropertyList_add(&_system_properties,
447 new SystemProperty("java.vm.specification.version", buffer, false));
448 PropertyList_add(&_system_properties,
449 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
450 }
451
452 /*
453 * -XX argument processing:
454 *
455 * -XX arguments are defined in several places, such as:
456 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
457 * -XX arguments are parsed in parse_argument().
458 * -XX argument bounds checking is done in check_vm_args_consistency().
459 *
460 * Over time -XX arguments may change. There are mechanisms to handle common cases:
461 *
462 * ALIASED: An option that is simply another name for another option. This is often
463 * part of the process of deprecating a flag, but not all aliases need
464 * to be deprecated.
465 *
466 * Create an alias for an option by adding the old and new option names to the
467 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
468 *
469 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
470 * support may be removed in the future. Both regular and aliased options may be
471 * deprecated.
472 *
473 * Add a deprecation warning for an option (or alias) by adding an entry in the
474 * "special_jvm_flags" table and setting the "deprecated_in" field.
475 * Often an option "deprecated" in one major release will
476 * be made "obsolete" in the next. In this case the entry should also have its
477 * "obsolete_in" field set.
478 *
479 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
480 * on the command line. A warning is printed to let the user know that option might not
481 * be accepted in the future.
482 *
483 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
484 * table and setting the "obsolete_in" field.
485 *
486 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
487 * to the current JDK version. The system will flatly refuse to admit the existence of
488 * the flag. This allows a flag to die automatically over JDK releases.
489 *
490 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
491 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
492 * - Newly obsolete or expired deprecated options should have their global variable
493 * definitions removed (from globals.hpp, etc) and related implementations removed.
494 *
495 * Recommended approach for removing options:
496 *
497 * To remove options commonly used by customers (e.g. product -XX options), use
498 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
499 *
500 * To remove internal options (e.g. diagnostic, experimental, develop options), use
501 * a 2-step model adding major release numbers to the obsolete and expire columns.
502 *
503 * To change the name of an option, use the alias table as well as a 2-step
504 * model adding major release numbers to the deprecate and expire columns.
505 * Think twice about aliasing commonly used customer options.
506 *
507 * There are times when it is appropriate to leave a future release number as undefined.
508 *
509 * Tests: Aliases should be tested in VMAliasOptions.java.
510 * Deprecated options should be tested in VMDeprecatedOptions.java.
511 */
512
513 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
514 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
515 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
516 // the command-line as usual, but will issue a warning.
517 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
518 // the command-line, while issuing a warning and ignoring the flag value.
519 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
520 // existence of the flag.
521 //
522 // MANUAL CLEANUP ON JDK VERSION UPDATES:
523 // This table ensures that the handling of options will update automatically when the JDK
524 // version is incremented, but the source code needs to be cleanup up manually:
525 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
526 // variable should be removed, as well as users of the variable.
527 // - As "deprecated" options age into "obsolete" options, move the entry into the
528 // "Obsolete Flags" section of the table.
529 // - All expired options should be removed from the table.
530 static SpecialFlag const special_jvm_flags[] = {
531 // -------------- Deprecated Flags --------------
532 // --- Non-alias flags - sorted by obsolete_in then expired_in:
533 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
534 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
535 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
536 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
537 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
538 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
539 #ifdef _LP64
540 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(27), JDK_Version::undefined() },
541 #endif
542 { "AggressiveHeap", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
543 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
544 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
545
546 // -------------- Obsolete Flags - sorted by expired_in --------------
547
548 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
549 #if defined(AARCH64)
550 { "NearCpool", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
551 #endif
552
553 { "PSChunkLargeArrays", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
554 { "ParallelRefProcEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
555 { "ParallelRefProcBalancingEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
556 { "MaxRAM", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
557 { "NewSizeThreadIncrease", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
558 { "NeverActAsServerClassMachine", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
559 { "AlwaysActAsServerClassMachine", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
560 { "UseXMMForArrayCopy", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
561 { "UseNewLongLShift", JDK_Version::undefined(), JDK_Version::jdk(27), JDK_Version::jdk(28) },
562
563 #ifdef ASSERT
564 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
565 #endif
566
567 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
568 // These entries will generate build errors. Their purpose is to test the macros.
569 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
570 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
571 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
572 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
573 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
574 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
575 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
576 #endif
577
578 { nullptr, JDK_Version(0), JDK_Version(0) }
579 };
580
581 // Flags that are aliases for other flags.
582 typedef struct {
583 const char* alias_name;
584 const char* real_name;
585 } AliasedFlag;
586
587 static AliasedFlag const aliased_jvm_flags[] = {
588 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
589 { nullptr, nullptr}
590 };
591
592 // Return true if "v" is less than "other", where "other" may be "undefined".
593 static bool version_less_than(JDK_Version v, JDK_Version other) {
594 assert(!v.is_undefined(), "must be defined");
595 if (!other.is_undefined() && v.compare(other) >= 0) {
596 return false;
597 } else {
598 return true;
599 }
600 }
601
602 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
603 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
604 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
605 flag = special_jvm_flags[i];
606 return true;
607 }
608 }
609 return false;
610 }
611
612 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
613 assert(version != nullptr, "Must provide a version buffer");
614 SpecialFlag flag;
615 if (lookup_special_flag(flag_name, flag)) {
616 if (!flag.obsolete_in.is_undefined()) {
617 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
618 *version = flag.obsolete_in;
619 // This flag may have been marked for obsoletion in this version, but we may not
620 // have actually removed it yet. Rather than ignoring it as soon as we reach
621 // this version we allow some time for the removal to happen. So if the flag
622 // still actually exists we process it as normal, but issue an adjusted warning.
623 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
624 if (real_flag != nullptr) {
625 char version_str[256];
626 version->to_string(version_str, sizeof(version_str));
627 warning("Temporarily processing option %s; support is scheduled for removal in %s",
628 flag_name, version_str);
629 return false;
630 }
631 return true;
632 }
633 }
634 }
635 return false;
636 }
637
638 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
639 assert(version != nullptr, "Must provide a version buffer");
640 SpecialFlag flag;
641 if (lookup_special_flag(flag_name, flag)) {
642 if (!flag.deprecated_in.is_undefined()) {
643 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
644 version_less_than(JDK_Version::current(), flag.expired_in)) {
645 *version = flag.deprecated_in;
646 return 1;
647 } else {
648 return -1;
649 }
650 }
651 }
652 return 0;
653 }
654
655 const char* Arguments::real_flag_name(const char *flag_name) {
656 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
657 const AliasedFlag& flag_status = aliased_jvm_flags[i];
658 if (strcmp(flag_status.alias_name, flag_name) == 0) {
659 return flag_status.real_name;
660 }
661 }
662 return flag_name;
663 }
664
665 #ifdef ASSERT
666 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
667 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
668 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
669 return true;
670 }
671 }
672 return false;
673 }
674
675 // Verifies the correctness of the entries in the special_jvm_flags table.
676 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
677 // version being earlier than the deprecation version, then a warning is issued
678 // and verification fails - by returning false. If it is detected that the table
679 // is out of date, with respect to the current version, then ideally a warning is
680 // issued but verification does not fail. This allows the VM to operate when the
681 // version is first updated, without needing to update all the impacted flags at
682 // the same time. In practice we can't issue the warning immediately when the version
683 // is updated as it occurs for every test and some tests are not prepared to handle
684 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
685 // if the check_globals flag is true, and in addition allow a grace period and only
686 // check for stale flags when we hit build 25 (which is far enough into the 6 month
687 // release cycle that all flag updates should have been processed, whilst still
688 // leaving time to make the change before RDP2).
689 // We use a gtest to call this, passing true, so that we can detect stale flags before
690 // the end of the release cycle.
691
692 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
693
694 bool Arguments::verify_special_jvm_flags(bool check_globals) {
695 bool success = true;
696 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
697 const SpecialFlag& flag = special_jvm_flags[i];
698 if (lookup_special_flag(flag.name, i)) {
699 warning("Duplicate special flag declaration \"%s\"", flag.name);
700 success = false;
701 }
702 if (flag.deprecated_in.is_undefined() &&
703 flag.obsolete_in.is_undefined()) {
704 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
705 success = false;
706 }
707
708 if (!flag.deprecated_in.is_undefined()) {
709 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
710 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
711 success = false;
712 }
713
714 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
715 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
716 success = false;
717 }
718 }
719
720 if (!flag.obsolete_in.is_undefined()) {
721 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
722 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
723 success = false;
724 }
725
726 // if flag has become obsolete it should not have a "globals" flag defined anymore.
727 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
728 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
729 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
730 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
731 success = false;
732 }
733 }
734
735 } else if (!flag.expired_in.is_undefined()) {
736 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
737 success = false;
738 }
739
740 if (!flag.expired_in.is_undefined()) {
741 // if flag has become expired it should not have a "globals" flag defined anymore.
742 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
743 !version_less_than(JDK_Version::current(), flag.expired_in)) {
744 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
745 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
746 success = false;
747 }
748 }
749 }
750 }
751 return success;
752 }
753 #endif
754
755 bool Arguments::atojulong(const char *s, julong* result) {
756 return parse_integer(s, result);
757 }
758
759 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
760 if (size < min_size) return arg_too_small;
761 if (size > max_size) return arg_too_big;
762 return arg_in_range;
763 }
764
765 // Describe an argument out of range error
766 void Arguments::describe_range_error(ArgsRange errcode) {
767 switch(errcode) {
768 case arg_too_big:
769 jio_fprintf(defaultStream::error_stream(),
770 "The specified size exceeds the maximum "
771 "representable size.\n");
772 break;
773 case arg_too_small:
774 case arg_unreadable:
775 case arg_in_range:
776 // do nothing for now
777 break;
778 default:
779 ShouldNotReachHere();
780 }
781 }
782
783 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
784 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
785 return true;
786 } else {
787 return false;
788 }
789 }
790
791 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
792 // strtod allows leading whitespace, but our flag format does not.
793 if (*value == '\0' || isspace((unsigned char) *value)) {
794 return false;
795 }
796 char* end;
797 errno = 0;
798 double v = strtod(value, &end);
799 if ((errno != 0) || (*end != 0)) {
800 return false;
801 }
802 if (g_isnan(v) || !g_isfinite(v)) {
803 // Currently we cannot handle these special values.
804 return false;
805 }
806
807 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
808 return true;
809 }
810 return false;
811 }
812
813 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
814 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
815
816 if (flag->is_int()) {
817 int v;
818 if (parse_integer(value, &v)) {
819 result = JVMFlagAccess::set_int(flag, &v, origin);
820 }
821 } else if (flag->is_uint()) {
822 uint v;
823 if (parse_integer(value, &v)) {
824 result = JVMFlagAccess::set_uint(flag, &v, origin);
825 }
826 } else if (flag->is_intx()) {
827 intx v;
828 if (parse_integer(value, &v)) {
829 result = JVMFlagAccess::set_intx(flag, &v, origin);
830 }
831 } else if (flag->is_uintx()) {
832 uintx v;
833 if (parse_integer(value, &v)) {
834 result = JVMFlagAccess::set_uintx(flag, &v, origin);
835 }
836 } else if (flag->is_uint64_t()) {
837 uint64_t v;
838 if (parse_integer(value, &v)) {
839 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
840 }
841 } else if (flag->is_size_t()) {
842 size_t v;
843 if (parse_integer(value, &v)) {
844 result = JVMFlagAccess::set_size_t(flag, &v, origin);
845 }
846 }
847
848 return result == JVMFlag::SUCCESS;
849 }
850
851 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
852 if (value[0] == '\0') {
853 value = nullptr;
854 }
855 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
856 // Contract: JVMFlag always returns a pointer that needs freeing.
857 FREE_C_HEAP_ARRAY(char, value);
858 return true;
859 }
860
861 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
862 const char* old_value = "";
863 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
864 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
865 size_t new_len = strlen(new_value);
866 const char* value;
867 char* free_this_too = nullptr;
868 if (old_len == 0) {
869 value = new_value;
870 } else if (new_len == 0) {
871 value = old_value;
872 } else {
873 size_t length = old_len + 1 + new_len + 1;
874 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
875 // each new setting adds another LINE to the switch:
876 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
877 value = buf;
878 free_this_too = buf;
879 }
880 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
881 // JVMFlag always returns a pointer that needs freeing.
882 FREE_C_HEAP_ARRAY(char, value);
883 // JVMFlag made its own copy, so I must delete my own temp. buffer.
884 FREE_C_HEAP_ARRAY(char, free_this_too);
885 return true;
886 }
887
888 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
889 const char* real_name = real_flag_name(arg);
890 JDK_Version since = JDK_Version();
891 switch (is_deprecated_flag(arg, &since)) {
892 case -1: {
893 // Obsolete or expired, so don't process normally,
894 // but allow for an obsolete flag we're still
895 // temporarily allowing.
896 if (!is_obsolete_flag(arg, &since)) {
897 return real_name;
898 }
899 // Note if we're not considered obsolete then we can't be expired either
900 // as obsoletion must come first.
901 return nullptr;
902 }
903 case 0:
904 return real_name;
905 case 1: {
906 char version[256];
907 since.to_string(version, sizeof(version));
908 if (real_name != arg) {
909 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
910 arg, version, real_name);
911 } else {
912 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
913 arg, version);
914 }
915 return real_name;
916 }
917 }
918 ShouldNotReachHere();
919 return nullptr;
920 }
921
922 #define BUFLEN 255
923
924 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
925 char name_copied[BUFLEN+1];
926 if (name[name_length] != 0) {
927 if (name_length > BUFLEN) {
928 return nullptr;
929 } else {
930 strncpy(name_copied, name, name_length);
931 name_copied[name_length] = '\0';
932 name = name_copied;
933 }
934 }
935
936 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
937 if (real_name == nullptr) {
938 return nullptr;
939 }
940 JVMFlag* flag = JVMFlag::find_flag(real_name);
941 return flag;
942 }
943
944 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
945 bool is_bool = false;
946 bool bool_val = false;
947 char c = *arg;
948 if (c == '+' || c == '-') {
949 is_bool = true;
950 bool_val = (c == '+');
951 arg++;
952 }
953
954 const char* name = arg;
955 while (true) {
956 c = *arg;
957 if (isalnum(c) || (c == '_')) {
958 ++arg;
959 } else {
960 break;
961 }
962 }
963
964 size_t name_len = size_t(arg - name);
965 if (name_len == 0) {
966 return false;
967 }
968
969 JVMFlag* flag = find_jvm_flag(name, name_len);
970 if (flag == nullptr) {
971 return false;
972 }
973
974 if (is_bool) {
975 if (*arg != 0) {
976 // Error -- extra characters such as -XX:+BoolFlag=123
977 return false;
978 }
979 return set_bool_flag(flag, bool_val, origin);
980 }
981
982 if (arg[0] == '=') {
983 const char* value = arg + 1;
984 if (flag->is_ccstr()) {
985 if (flag->ccstr_accumulates()) {
986 return append_to_string_flag(flag, value, origin);
987 } else {
988 return set_string_flag(flag, value, origin);
989 }
990 } else if (flag->is_double()) {
991 return set_fp_numeric_flag(flag, value, origin);
992 } else {
993 return set_numeric_flag(flag, value, origin);
994 }
995 }
996
997 if (arg[0] == ':' && arg[1] == '=') {
998 // -XX:Foo:=xxx will reset the string flag to the given value.
999 const char* value = arg + 2;
1000 return set_string_flag(flag, value, origin);
1001 }
1002
1003 return false;
1004 }
1005
1006 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1007 assert(bldarray != nullptr, "illegal argument");
1008
1009 if (arg == nullptr) {
1010 return;
1011 }
1012
1013 int new_count = *count + 1;
1014
1015 // expand the array and add arg to the last element
1016 if (*bldarray == nullptr) {
1017 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1018 } else {
1019 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1020 }
1021 (*bldarray)[*count] = os::strdup_check_oom(arg);
1022 *count = new_count;
1023 }
1024
1025 void Arguments::build_jvm_args(const char* arg) {
1026 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1027 }
1028
1029 void Arguments::build_jvm_flags(const char* arg) {
1030 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1031 }
1032
1033 // utility function to return a string that concatenates all
1034 // strings in a given char** array
1035 const char* Arguments::build_resource_string(char** args, int count) {
1036 if (args == nullptr || count == 0) {
1037 return nullptr;
1038 }
1039 size_t length = 0;
1040 for (int i = 0; i < count; i++) {
1041 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1042 }
1043 char* s = NEW_RESOURCE_ARRAY(char, length);
1044 char* dst = s;
1045 for (int j = 0; j < count; j++) {
1046 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1047 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1048 dst += offset;
1049 length -= offset;
1050 }
1051 return (const char*) s;
1052 }
1053
1054 void Arguments::print_on(outputStream* st) {
1055 st->print_cr("VM Arguments:");
1056 if (num_jvm_flags() > 0) {
1057 st->print("jvm_flags: "); print_jvm_flags_on(st);
1058 st->cr();
1059 }
1060 if (num_jvm_args() > 0) {
1061 st->print("jvm_args: "); print_jvm_args_on(st);
1062 st->cr();
1063 }
1064 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1065 if (_java_class_path != nullptr) {
1066 char* path = _java_class_path->value();
1067 size_t len = strlen(path);
1068 st->print("java_class_path (initial): ");
1069 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1070 if (len == 0) {
1071 st->print_raw_cr("<not set>");
1072 } else {
1073 st->print_raw_cr(path, len);
1074 }
1075 }
1076 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1077 }
1078
1079 void Arguments::print_summary_on(outputStream* st) {
1080 // Print the command line. Environment variables that are helpful for
1081 // reproducing the problem are written later in the hs_err file.
1082 // flags are from setting file
1083 if (num_jvm_flags() > 0) {
1084 st->print_raw("Settings File: ");
1085 print_jvm_flags_on(st);
1086 st->cr();
1087 }
1088 // args are the command line and environment variable arguments.
1089 st->print_raw("Command Line: ");
1090 if (num_jvm_args() > 0) {
1091 print_jvm_args_on(st);
1092 }
1093 // this is the classfile and any arguments to the java program
1094 if (java_command() != nullptr) {
1095 st->print("%s", java_command());
1096 }
1097 st->cr();
1098 }
1099
1100 void Arguments::set_jvm_flags_file(const char *value) {
1101 if (_jvm_flags_file != nullptr) {
1102 os::free(_jvm_flags_file);
1103 }
1104 _jvm_flags_file = os::strdup_check_oom(value);
1105 }
1106
1107 void Arguments::print_jvm_flags_on(outputStream* st) {
1108 if (_num_jvm_flags > 0) {
1109 for (int i=0; i < _num_jvm_flags; i++) {
1110 st->print("%s ", _jvm_flags_array[i]);
1111 }
1112 }
1113 }
1114
1115 void Arguments::print_jvm_args_on(outputStream* st) {
1116 if (_num_jvm_args > 0) {
1117 for (int i=0; i < _num_jvm_args; i++) {
1118 st->print("%s ", _jvm_args_array[i]);
1119 }
1120 }
1121 }
1122
1123 bool Arguments::process_argument(const char* arg,
1124 jboolean ignore_unrecognized,
1125 JVMFlagOrigin origin) {
1126 JDK_Version since = JDK_Version();
1127
1128 if (parse_argument(arg, origin)) {
1129 return true;
1130 }
1131
1132 // Determine if the flag has '+', '-', or '=' characters.
1133 bool has_plus_minus = (*arg == '+' || *arg == '-');
1134 const char* const argname = has_plus_minus ? arg + 1 : arg;
1135
1136 size_t arg_len;
1137 const char* equal_sign = strchr(argname, '=');
1138 if (equal_sign == nullptr) {
1139 arg_len = strlen(argname);
1140 } else {
1141 arg_len = equal_sign - argname;
1142 }
1143
1144 // Only make the obsolete check for valid arguments.
1145 if (arg_len <= BUFLEN) {
1146 // Construct a string which consists only of the argument name without '+', '-', or '='.
1147 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1148 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1149 if (is_obsolete_flag(stripped_argname, &since)) {
1150 char version[256];
1151 since.to_string(version, sizeof(version));
1152 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1153 return true;
1154 }
1155 }
1156
1157 // For locked flags, report a custom error message if available.
1158 // Otherwise, report the standard unrecognized VM option.
1159 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1160 if (found_flag != nullptr) {
1161 char locked_message_buf[BUFLEN];
1162 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1163 if (strlen(locked_message_buf) != 0) {
1164 #ifdef PRODUCT
1165 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1166 if (ignore_unrecognized && mismatched) {
1167 return true;
1168 }
1169 #endif
1170 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1171 }
1172 if (found_flag->is_bool() && !has_plus_minus) {
1173 jio_fprintf(defaultStream::error_stream(),
1174 "Missing +/- setting for VM option '%s'\n", argname);
1175 } else if (!found_flag->is_bool() && has_plus_minus) {
1176 jio_fprintf(defaultStream::error_stream(),
1177 "Unexpected +/- setting in VM option '%s'\n", argname);
1178 } else {
1179 jio_fprintf(defaultStream::error_stream(),
1180 "Improperly specified VM option '%s'\n", argname);
1181 }
1182 } else {
1183 if (ignore_unrecognized) {
1184 return true;
1185 }
1186 jio_fprintf(defaultStream::error_stream(),
1187 "Unrecognized VM option '%s'\n", argname);
1188 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1189 if (fuzzy_matched != nullptr) {
1190 jio_fprintf(defaultStream::error_stream(),
1191 "Did you mean '%s%s%s'?\n",
1192 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1193 fuzzy_matched->name(),
1194 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1195 }
1196 }
1197
1198 // allow for commandline "commenting out" options like -XX:#+Verbose
1199 return arg[0] == '#';
1200 }
1201
1202 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1203 FILE* stream = os::fopen(file_name, "rb");
1204 if (stream == nullptr) {
1205 if (should_exist) {
1206 jio_fprintf(defaultStream::error_stream(),
1207 "Could not open settings file %s\n", file_name);
1208 return false;
1209 } else {
1210 return true;
1211 }
1212 }
1213
1214 char token[1024];
1215 size_t pos = 0;
1216
1217 bool in_white_space = true;
1218 bool in_comment = false;
1219 bool in_quote = false;
1220 char quote_c = 0;
1221 bool result = true;
1222
1223 int c_or_eof = getc(stream);
1224 while (c_or_eof != EOF && pos < (sizeof(token) - 1)) {
1225 // We have checked the c_or_eof for EOF. getc should only ever return the
1226 // EOF or an unsigned char converted to an int. We cast down to a char to
1227 // avoid the char to int promotions we would otherwise do in the comparisons
1228 // below (which would be incorrect if we ever compared to a non-ascii char),
1229 // and the int to char conversions we would otherwise do in the assignments.
1230 const char c = static_cast<char>(c_or_eof);
1231 if (in_white_space) {
1232 if (in_comment) {
1233 if (c == '\n') in_comment = false;
1234 } else {
1235 if (c == '#') in_comment = true;
1236 else if (!isspace((unsigned char) c)) {
1237 in_white_space = false;
1238 token[pos++] = c;
1239 }
1240 }
1241 } else {
1242 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1243 // token ends at newline, or at unquoted whitespace
1244 // this allows a way to include spaces in string-valued options
1245 token[pos] = '\0';
1246 logOption(token);
1247 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1248 build_jvm_flags(token);
1249 pos = 0;
1250 in_white_space = true;
1251 in_quote = false;
1252 } else if (!in_quote && (c == '\'' || c == '"')) {
1253 in_quote = true;
1254 quote_c = c;
1255 } else if (in_quote && (c == quote_c)) {
1256 in_quote = false;
1257 } else {
1258 token[pos++] = c;
1259 }
1260 }
1261 c_or_eof = getc(stream);
1262 }
1263 if (pos > 0) {
1264 token[pos] = '\0';
1265 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1266 build_jvm_flags(token);
1267 }
1268 fclose(stream);
1269 return result;
1270 }
1271
1272 //=============================================================================================================
1273 // Parsing of properties (-D)
1274
1275 const char* Arguments::get_property(const char* key) {
1276 return PropertyList_get_value(system_properties(), key);
1277 }
1278
1279 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1280 const char* eq = strchr(prop, '=');
1281 const char* key;
1282 const char* value = "";
1283
1284 if (eq == nullptr) {
1285 // property doesn't have a value, thus use passed string
1286 key = prop;
1287 } else {
1288 // property have a value, thus extract it and save to the
1289 // allocated string
1290 size_t key_len = eq - prop;
1291 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1292
1293 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1294 key = tmp_key;
1295
1296 value = &prop[key_len + 1];
1297 }
1298
1299 if (internal == ExternalProperty) {
1300 CDSConfig::check_incompatible_property(key, value);
1301 }
1302
1303 if (strcmp(key, "java.compiler") == 0) {
1304 // we no longer support java.compiler system property, log a warning and let it get
1305 // passed to Java, like any other system property
1306 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1307 // for applications using NONE or empty value, log a more informative message
1308 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1309 } else {
1310 warning("The java.compiler system property is obsolete and no longer supported.");
1311 }
1312 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1313 // append is true, writable is true, internal is false
1314 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1315 WriteableProperty, ExternalProperty);
1316 } else {
1317 if (strcmp(key, "sun.java.command") == 0) {
1318 char *old_java_command = _java_command;
1319 _java_command = os::strdup_check_oom(value, mtArguments);
1320 if (old_java_command != nullptr) {
1321 os::free(old_java_command);
1322 }
1323 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1324 // If this property is set on the command line then its value will be
1325 // displayed in VM error logs as the URL at which to submit such logs.
1326 // Normally the URL displayed in error logs is different from the value
1327 // of this system property, so a different property should have been
1328 // used here, but we leave this as-is in case someone depends upon it.
1329 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1330 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1331 // its value without going through the property list or making a Java call.
1332 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1333 if (old_java_vendor_url_bug != nullptr) {
1334 os::free((void *)old_java_vendor_url_bug);
1335 }
1336 }
1337
1338 // Create new property and add at the end of the list
1339 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1340 }
1341
1342 if (key != prop) {
1343 // SystemProperty copy passed value, thus free previously allocated
1344 // memory
1345 FreeHeap((void *)key);
1346 }
1347
1348 return true;
1349 }
1350
1351 //===========================================================================================================
1352 // Setting int/mixed/comp mode flags
1353
1354 void Arguments::set_mode_flags(Mode mode) {
1355 // Set up default values for all flags.
1356 // If you add a flag to any of the branches below,
1357 // add a default value for it here.
1358 _mode = mode;
1359
1360 // Ensure Agent_OnLoad has the correct initial values.
1361 // This may not be the final mode; mode may change later in onload phase.
1362 PropertyList_unique_add(&_system_properties, "java.vm.info",
1363 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1364
1365 UseInterpreter = true;
1366 UseCompiler = true;
1367 UseLoopCounter = true;
1368
1369 // Default values may be platform/compiler dependent -
1370 // use the saved values
1371 ClipInlining = Arguments::_ClipInlining;
1372 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1373 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1374 BackgroundCompilation = Arguments::_BackgroundCompilation;
1375
1376 // Change from defaults based on mode
1377 switch (mode) {
1378 default:
1379 ShouldNotReachHere();
1380 break;
1381 case _int:
1382 UseCompiler = false;
1383 UseLoopCounter = false;
1384 AlwaysCompileLoopMethods = false;
1385 UseOnStackReplacement = false;
1386 break;
1387 case _mixed:
1388 // same as default
1389 break;
1390 case _comp:
1391 UseInterpreter = false;
1392 BackgroundCompilation = false;
1393 ClipInlining = false;
1394 break;
1395 }
1396 }
1397
1398 // Conflict: required to use shared spaces (-Xshare:on), but
1399 // incompatible command line options were chosen.
1400 void Arguments::no_shared_spaces(const char* message) {
1401 if (RequireSharedSpaces) {
1402 aot_log_error(aot)("%s is incompatible with other specified options.",
1403 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1404 if (CDSConfig::new_aot_flags_used()) {
1405 vm_exit_during_initialization("Unable to use AOT cache", message);
1406 } else {
1407 vm_exit_during_initialization("Unable to use shared archive", message);
1408 }
1409 } else {
1410 if (CDSConfig::new_aot_flags_used()) {
1411 log_warning(aot)("Unable to use AOT cache: %s", message);
1412 } else {
1413 aot_log_info(aot)("Unable to use shared archive: %s", message);
1414 }
1415 UseSharedSpaces = false;
1416 }
1417 }
1418
1419 static void set_object_alignment() {
1420 // Object alignment.
1421 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1422 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1423 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1424 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1425 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1426 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1427
1428 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1429 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1430
1431 // Oop encoding heap max
1432 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1433 }
1434
1435 size_t Arguments::max_heap_for_compressed_oops() {
1436 // Avoid sign flip.
1437 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1438 // We need to fit both the null page and the heap into the memory budget, while
1439 // keeping alignment constraints of the heap. To guarantee the latter, as the
1440 // null page is located before the heap, we pad the null page to the conservative
1441 // maximum alignment that the GC may ever impose upon the heap.
1442 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1443 _conservative_max_heap_alignment);
1444
1445 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1446 NOT_LP64(ShouldNotReachHere(); return 0);
1447 }
1448
1449 void Arguments::set_use_compressed_oops() {
1450 #ifdef _LP64
1451 // MaxHeapSize is not set up properly at this point, but
1452 // the only value that can override MaxHeapSize if we are
1453 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1454 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1455
1456 if (max_heap_size <= max_heap_for_compressed_oops()) {
1457 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1458 FLAG_SET_ERGO(UseCompressedOops, true);
1459 }
1460 } else {
1461 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1462 warning("Max heap size too large for Compressed Oops");
1463 FLAG_SET_DEFAULT(UseCompressedOops, false);
1464 }
1465 }
1466 #endif // _LP64
1467 }
1468
1469 void Arguments::set_conservative_max_heap_alignment() {
1470 // The conservative maximum required alignment for the heap is the maximum of
1471 // the alignments imposed by several sources: any requirements from the heap
1472 // itself and the maximum page size we may run the VM with.
1473 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1474 _conservative_max_heap_alignment = MAX3(heap_alignment,
1475 os::vm_allocation_granularity(),
1476 os::max_page_size());
1477 assert(is_power_of_2(_conservative_max_heap_alignment), "Expected to be a power-of-2");
1478 }
1479
1480 jint Arguments::set_ergonomics_flags() {
1481 GCConfig::initialize();
1482
1483 set_conservative_max_heap_alignment();
1484
1485 #ifdef _LP64
1486 set_use_compressed_oops();
1487
1488 // Also checks that certain machines are slower with compressed oops
1489 // in vm_version initialization code.
1490 #endif // _LP64
1491
1492 return JNI_OK;
1493 }
1494
1495 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1496 // The AggressiveHeap check is a temporary workaround to avoid calling
1497 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1498 // selected. This works because AggressiveHeap implies UseParallelGC
1499 // where we know the ratio will be 1. Once the AggressiveHeap option is
1500 // removed, this can be cleaned up.
1501 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1502 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1503 size_t max_allocatable = os::commit_memory_limit();
1504
1505 return MIN2(limit, max_allocatable / fraction);
1506 }
1507
1508 // Use static initialization to get the default before parsing
1509 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1510
1511 static size_t clamp_by_size_t_max(uint64_t value) {
1512 return (size_t)MIN2(value, (uint64_t)std::numeric_limits<size_t>::max());
1513 }
1514
1515 void Arguments::set_heap_size() {
1516 // Check if the user has configured any limit on the amount of RAM we may use.
1517 bool has_ram_limit = !FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1518 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1519 !FLAG_IS_DEFAULT(InitialRAMPercentage);
1520
1521 const size_t avail_mem = os::physical_memory();
1522
1523 // If the maximum heap size has not been set with -Xmx, then set it as
1524 // fraction of the size of physical memory, respecting the maximum and
1525 // minimum sizes of the heap.
1526 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1527 uint64_t min_memory = (uint64_t)(((double)avail_mem * MinRAMPercentage) / 100);
1528 uint64_t max_memory = (uint64_t)(((double)avail_mem * MaxRAMPercentage) / 100);
1529
1530 const size_t reasonable_min = clamp_by_size_t_max(min_memory);
1531 size_t reasonable_max = clamp_by_size_t_max(max_memory);
1532
1533 if (reasonable_min < MaxHeapSize) {
1534 // Small physical memory, so use a minimum fraction of it for the heap
1535 reasonable_max = reasonable_min;
1536 } else {
1537 // Not-small physical memory, so require a heap at least
1538 // as large as MaxHeapSize
1539 reasonable_max = MAX2(reasonable_max, MaxHeapSize);
1540 }
1541
1542 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1543 // Limit the heap size to ErgoHeapSizeLimit
1544 reasonable_max = MIN2(reasonable_max, ErgoHeapSizeLimit);
1545 }
1546
1547 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1548
1549 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1550 // An initial heap size was specified on the command line,
1551 // so be sure that the maximum size is consistent. Done
1552 // after call to limit_heap_by_allocatable_memory because that
1553 // method might reduce the allocation size.
1554 reasonable_max = MAX2(reasonable_max, InitialHeapSize);
1555 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1556 reasonable_max = MAX2(reasonable_max, MinHeapSize);
1557 }
1558
1559 #ifdef _LP64
1560 if (UseCompressedOops) {
1561 // HeapBaseMinAddress can be greater than default but not less than.
1562 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1563 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1564 // matches compressed oops printing flags
1565 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu "
1566 "(%zuG) which is greater than value given %zu",
1567 DefaultHeapBaseMinAddress,
1568 DefaultHeapBaseMinAddress/G,
1569 HeapBaseMinAddress);
1570 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1571 }
1572 }
1573
1574 uintptr_t heap_end = HeapBaseMinAddress + MaxHeapSize;
1575 uintptr_t max_coop_heap = max_heap_for_compressed_oops();
1576
1577 // Limit the heap size to the maximum possible when using compressed oops
1578 if (heap_end < max_coop_heap) {
1579 // Heap should be above HeapBaseMinAddress to get zero based compressed
1580 // oops but it should be not less than default MaxHeapSize.
1581 max_coop_heap -= HeapBaseMinAddress;
1582 }
1583
1584 // If the user has configured any limit on the amount of RAM we may use,
1585 // then disable compressed oops if the calculated max exceeds max_coop_heap
1586 // and UseCompressedOops was not specified.
1587 if (reasonable_max > max_coop_heap) {
1588 if (FLAG_IS_ERGO(UseCompressedOops) && has_ram_limit) {
1589 log_debug(gc, heap, coops)("UseCompressedOops disabled due to "
1590 "max heap %zu > compressed oop heap %zu. "
1591 "Please check the setting of MaxRAMPercentage %5.2f.",
1592 reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1593 FLAG_SET_ERGO(UseCompressedOops, false);
1594 } else {
1595 reasonable_max = max_coop_heap;
1596 }
1597 }
1598 }
1599 #endif // _LP64
1600
1601 log_trace(gc, heap)(" Maximum heap size %zu", reasonable_max);
1602 FLAG_SET_ERGO(MaxHeapSize, reasonable_max);
1603 }
1604
1605 // If the minimum or initial heap_size have not been set or requested to be set
1606 // ergonomically, set them accordingly.
1607 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1608 size_t reasonable_minimum = clamp_by_size_t_max((uint64_t)OldSize + (uint64_t)NewSize);
1609 reasonable_minimum = MIN2(reasonable_minimum, MaxHeapSize);
1610 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1611
1612 if (InitialHeapSize == 0) {
1613 uint64_t initial_memory = (uint64_t)(((double)avail_mem * InitialRAMPercentage) / 100);
1614 size_t reasonable_initial = clamp_by_size_t_max(initial_memory);
1615 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1616
1617 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, MinHeapSize);
1618 reasonable_initial = MIN2(reasonable_initial, MaxHeapSize);
1619
1620 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1621 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize);
1622 }
1623
1624 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1625 // synchronize with InitialHeapSize to avoid errors with the default value.
1626 if (MinHeapSize == 0) {
1627 FLAG_SET_ERGO(MinHeapSize, MIN2(reasonable_minimum, InitialHeapSize));
1628 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize);
1629 }
1630 }
1631 }
1632
1633 // This option inspects the machine and attempts to set various
1634 // parameters to be optimal for long-running, memory allocation
1635 // intensive jobs. It is intended for machines with large
1636 // amounts of cpu and memory.
1637 jint Arguments::set_aggressive_heap_flags() {
1638 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1639 // VM, but we may not be able to represent the total physical memory
1640 // available (like having 8gb of memory on a box but using a 32bit VM).
1641 // Thus, we need to make sure we're using a julong for intermediate
1642 // calculations.
1643 julong initHeapSize;
1644 physical_memory_size_type phys_mem = os::physical_memory();
1645 julong total_memory = static_cast<julong>(phys_mem);
1646
1647 if (total_memory < (julong) 256 * M) {
1648 jio_fprintf(defaultStream::error_stream(),
1649 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1650 vm_exit(1);
1651 }
1652
1653 // The heap size is half of available memory, or (at most)
1654 // all of possible memory less 160mb (leaving room for the OS
1655 // when using ISM). This is the maximum; because adaptive sizing
1656 // is turned on below, the actual space used may be smaller.
1657
1658 initHeapSize = MIN2(total_memory / (julong) 2,
1659 total_memory - (julong) 160 * M);
1660
1661 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1662
1663 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1664 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1665 return JNI_EINVAL;
1666 }
1667 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1668 return JNI_EINVAL;
1669 }
1670 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1671 return JNI_EINVAL;
1672 }
1673 }
1674 if (FLAG_IS_DEFAULT(NewSize)) {
1675 // Make the young generation 3/8ths of the total heap.
1676 if (FLAG_SET_CMDLINE(NewSize,
1677 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1678 return JNI_EINVAL;
1679 }
1680 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1681 return JNI_EINVAL;
1682 }
1683 }
1684
1685 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1686 FLAG_SET_DEFAULT(UseLargePages, true);
1687 #endif
1688
1689 // Increase some data structure sizes for efficiency
1690 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1691 return JNI_EINVAL;
1692 }
1693 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1694 return JNI_EINVAL;
1695 }
1696
1697 // See the OldPLABSize comment below, but replace 'after promotion'
1698 // with 'after copying'. YoungPLABSize is the size of the survivor
1699 // space per-gc-thread buffers. The default is 4kw.
1700 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1701 return JNI_EINVAL;
1702 }
1703
1704 // OldPLABSize is the size of the buffers in the old gen that
1705 // UseParallelGC uses to promote live data that doesn't fit in the
1706 // survivor spaces. At any given time, there's one for each gc thread.
1707 // The default size is 1kw. These buffers are rarely used, since the
1708 // survivor spaces are usually big enough. For specjbb, however, there
1709 // are occasions when there's lots of live data in the young gen
1710 // and we end up promoting some of it. We don't have a definite
1711 // explanation for why bumping OldPLABSize helps, but the theory
1712 // is that a bigger PLAB results in retaining something like the
1713 // original allocation order after promotion, which improves mutator
1714 // locality. A minor effect may be that larger PLABs reduce the
1715 // number of PLAB allocation events during gc. The value of 8kw
1716 // was arrived at by experimenting with specjbb.
1717 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1718 return JNI_EINVAL;
1719 }
1720
1721 // Enable parallel GC and adaptive generation sizing
1722 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1723 return JNI_EINVAL;
1724 }
1725
1726 // Encourage steady state memory management
1727 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1728 return JNI_EINVAL;
1729 }
1730
1731 return JNI_OK;
1732 }
1733
1734 // This must be called after ergonomics.
1735 void Arguments::set_bytecode_flags() {
1736 if (!RewriteBytecodes) {
1737 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1738 }
1739 }
1740
1741 // Aggressive optimization flags
1742 jint Arguments::set_aggressive_opts_flags() {
1743 #ifdef COMPILER2
1744 if (AggressiveUnboxing) {
1745 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1746 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1747 } else if (!EliminateAutoBox) {
1748 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1749 AggressiveUnboxing = false;
1750 }
1751 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1752 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1753 } else if (!DoEscapeAnalysis) {
1754 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1755 AggressiveUnboxing = false;
1756 }
1757 }
1758 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1759 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1760 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1761 }
1762 // Feed the cache size setting into the JDK
1763 char buffer[1024];
1764 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1765 if (!add_property(buffer)) {
1766 return JNI_ENOMEM;
1767 }
1768 }
1769 #endif
1770
1771 return JNI_OK;
1772 }
1773
1774 //===========================================================================================================
1775
1776 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1777 if (_sun_java_launcher != _default_java_launcher) {
1778 os::free(const_cast<char*>(_sun_java_launcher));
1779 }
1780 _sun_java_launcher = os::strdup_check_oom(launcher);
1781 }
1782
1783 bool Arguments::created_by_java_launcher() {
1784 assert(_sun_java_launcher != nullptr, "property must have value");
1785 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1786 }
1787
1788 bool Arguments::executing_unit_tests() {
1789 return _executing_unit_tests;
1790 }
1791
1792 //===========================================================================================================
1793 // Parsing of main arguments
1794
1795 static unsigned int addreads_count = 0;
1796 static unsigned int addexports_count = 0;
1797 static unsigned int addopens_count = 0;
1798 static unsigned int patch_mod_count = 0;
1799 static unsigned int enable_native_access_count = 0;
1800 static unsigned int enable_final_field_mutation = 0;
1801 static bool patch_mod_javabase = false;
1802
1803 // Check the consistency of vm_init_args
1804 bool Arguments::check_vm_args_consistency() {
1805 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1806 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
1807 return false;
1808 }
1809
1810 // Method for adding checks for flag consistency.
1811 // The intent is to warn the user of all possible conflicts,
1812 // before returning an error.
1813 // Note: Needs platform-dependent factoring.
1814 bool status = true;
1815
1816 if (TLABRefillWasteFraction == 0) {
1817 jio_fprintf(defaultStream::error_stream(),
1818 "TLABRefillWasteFraction should be a denominator, "
1819 "not %zu\n",
1820 TLABRefillWasteFraction);
1821 status = false;
1822 }
1823
1824 status = CompilerConfig::check_args_consistency(status);
1825 #if INCLUDE_JVMCI
1826 if (status && EnableJVMCI) {
1827 // Add the JVMCI module if not using libjvmci or EnableJVMCI
1828 // was explicitly set on the command line or in the jimage.
1829 if ((!UseJVMCINativeLibrary || FLAG_IS_CMDLINE(EnableJVMCI) || FLAG_IS_JIMAGE_RESOURCE(EnableJVMCI)) && ClassLoader::is_module_observable("jdk.internal.vm.ci") && !_jvmci_module_added) {
1830 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1831 return false;
1832 }
1833 }
1834 }
1835 #endif
1836
1837 #if INCLUDE_JFR
1838 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1839 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1840 return false;
1841 }
1842 }
1843 #endif
1844
1845 #ifndef SUPPORT_RESERVED_STACK_AREA
1846 if (StackReservedPages != 0) {
1847 FLAG_SET_CMDLINE(StackReservedPages, 0);
1848 warning("Reserved Stack Area not supported on this platform");
1849 }
1850 #endif
1851
1852 return status;
1853 }
1854
1855 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1856 const char* option_type) {
1857 if (ignore) return false;
1858
1859 const char* spacer = " ";
1860 if (option_type == nullptr) {
1861 option_type = ++spacer; // Set both to the empty string.
1862 }
1863
1864 jio_fprintf(defaultStream::error_stream(),
1865 "Unrecognized %s%soption: %s\n", option_type, spacer,
1866 option->optionString);
1867 return true;
1868 }
1869
1870 static const char* user_assertion_options[] = {
1871 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1872 };
1873
1874 static const char* system_assertion_options[] = {
1875 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1876 };
1877
1878 bool Arguments::parse_uint(const char* value,
1879 uint* uint_arg,
1880 uint min_size) {
1881 uint n;
1882 if (!parse_integer(value, &n)) {
1883 return false;
1884 }
1885 if (n >= min_size) {
1886 *uint_arg = n;
1887 return true;
1888 } else {
1889 return false;
1890 }
1891 }
1892
1893 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1894 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1895 CDSConfig::check_internal_module_property(prop_name, prop_value);
1896 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1897 char* property = AllocateHeap(prop_len, mtArguments);
1898 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1899 if (ret < 0 || ret >= (int)prop_len) {
1900 FreeHeap(property);
1901 return false;
1902 }
1903 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1904 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1905 // that multiple occurrences of the associated flag just causes the existing property value to be
1906 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1907 // to a property after we have finished flag processing.
1908 bool added = add_property(property, WriteableProperty, internal);
1909 FreeHeap(property);
1910 return added;
1911 }
1912
1913 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1914 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1915 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1916 const unsigned int props_count_limit = 1000;
1917 const int max_digits = 3;
1918 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1919
1920 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1921 if (count < props_count_limit) {
1922 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1923 char* property = AllocateHeap(prop_len, mtArguments);
1924 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1925 if (ret < 0 || ret >= (int)prop_len) {
1926 FreeHeap(property);
1927 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1928 return false;
1929 }
1930 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1931 FreeHeap(property);
1932 return added;
1933 }
1934
1935 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1936 return false;
1937 }
1938
1939 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1940 julong* long_arg,
1941 julong min_size,
1942 julong max_size) {
1943 if (!parse_integer(s, long_arg)) return arg_unreadable;
1944 return check_memory_size(*long_arg, min_size, max_size);
1945 }
1946
1947 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) {
1948 // Save default settings for some mode flags
1949 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1950 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1951 Arguments::_ClipInlining = ClipInlining;
1952 Arguments::_BackgroundCompilation = BackgroundCompilation;
1953
1954 // Remember the default value of SharedBaseAddress.
1955 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1956
1957 // Setup flags for mixed which is the default
1958 set_mode_flags(_mixed);
1959
1960 jint result;
1961 for (int i = 0; i < all_args->length(); i++) {
1962 result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin);
1963 if (result != JNI_OK) {
1964 return result;
1965 }
1966 }
1967
1968 // Disable CDS for exploded image
1969 if (!has_jimage()) {
1970 no_shared_spaces("CDS disabled on exploded JDK");
1971 }
1972
1973 // We need to ensure processor and memory resources have been properly
1974 // configured - which may rely on arguments we just processed - before
1975 // doing the final argument processing. Any argument processing that
1976 // needs to know about processor and memory resources must occur after
1977 // this point.
1978
1979 os::init_container_support();
1980
1981 SystemMemoryBarrier::initialize();
1982
1983 // Do final processing now that all arguments have been parsed
1984 result = finalize_vm_init_args();
1985 if (result != JNI_OK) {
1986 return result;
1987 }
1988
1989 return JNI_OK;
1990 }
1991
1992 #if !INCLUDE_JVMTI || INCLUDE_CDS
1993 // Checks if name in command-line argument -agent{lib,path}:name[=options]
1994 // represents a valid JDWP agent. is_path==true denotes that we
1995 // are dealing with -agentpath (case where name is a path), otherwise with
1996 // -agentlib
1997 static bool valid_jdwp_agent(char *name, bool is_path) {
1998 char *_name;
1999 const char *_jdwp = "jdwp";
2000 size_t _len_jdwp, _len_prefix;
2001
2002 if (is_path) {
2003 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2004 return false;
2005 }
2006
2007 _name++; // skip past last path separator
2008 _len_prefix = strlen(JNI_LIB_PREFIX);
2009
2010 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2011 return false;
2012 }
2013
2014 _name += _len_prefix;
2015 _len_jdwp = strlen(_jdwp);
2016
2017 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2018 _name += _len_jdwp;
2019 }
2020 else {
2021 return false;
2022 }
2023
2024 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2025 return false;
2026 }
2027
2028 return true;
2029 }
2030
2031 if (strcmp(name, _jdwp) == 0) {
2032 return true;
2033 }
2034
2035 return false;
2036 }
2037 #endif
2038
2039 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2040 // --patch-module=<module>=<file>(<pathsep><file>)*
2041 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2042 // Find the equal sign between the module name and the path specification
2043 const char* module_equal = strchr(patch_mod_tail, '=');
2044 if (module_equal == nullptr) {
2045 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2046 return JNI_ERR;
2047 } else {
2048 // Pick out the module name
2049 size_t module_len = module_equal - patch_mod_tail;
2050 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2051 if (module_name != nullptr) {
2052 memcpy(module_name, patch_mod_tail, module_len);
2053 *(module_name + module_len) = '\0';
2054 // The path piece begins one past the module_equal sign
2055 add_patch_mod_prefix(module_name, module_equal + 1);
2056 FREE_C_HEAP_ARRAY(char, module_name);
2057 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2058 return JNI_ENOMEM;
2059 }
2060 } else {
2061 return JNI_ENOMEM;
2062 }
2063 }
2064 return JNI_OK;
2065 }
2066
2067 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2068 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2069 // The min and max sizes match the values in globals.hpp, but scaled
2070 // with K. The values have been chosen so that alignment with page
2071 // size doesn't change the max value, which makes the conversions
2072 // back and forth between Xss value and ThreadStackSize value easier.
2073 // The values have also been chosen to fit inside a 32-bit signed type.
2074 const julong min_ThreadStackSize = 0;
2075 const julong max_ThreadStackSize = 1 * M;
2076
2077 // Make sure the above values match the range set in globals.hpp
2078 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2079 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2080 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2081
2082 const julong min_size = min_ThreadStackSize * K;
2083 const julong max_size = max_ThreadStackSize * K;
2084
2085 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2086
2087 julong size = 0;
2088 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2089 if (errcode != arg_in_range) {
2090 bool silent = (option == nullptr); // Allow testing to silence error messages
2091 if (!silent) {
2092 jio_fprintf(defaultStream::error_stream(),
2093 "Invalid thread stack size: %s\n", option->optionString);
2094 describe_range_error(errcode);
2095 }
2096 return JNI_EINVAL;
2097 }
2098
2099 // Internally track ThreadStackSize in units of 1024 bytes.
2100 const julong size_aligned = align_up(size, K);
2101 assert(size <= size_aligned,
2102 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2103 size, size_aligned);
2104
2105 const julong size_in_K = size_aligned / K;
2106 assert(size_in_K < (julong)max_intx,
2107 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2108 size_in_K);
2109
2110 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2111 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2112 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2113 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2114 max_expanded, size_in_K);
2115
2116 *out_ThreadStackSize = (intx)size_in_K;
2117
2118 return JNI_OK;
2119 }
2120
2121 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2122 // For match_option to return remaining or value part of option string
2123 const char* tail;
2124
2125 // iterate over arguments
2126 for (int index = 0; index < args->nOptions; index++) {
2127 bool is_absolute_path = false; // for -agentpath vs -agentlib
2128
2129 const JavaVMOption* option = args->options + index;
2130
2131 if (!match_option(option, "-Djava.class.path", &tail) &&
2132 !match_option(option, "-Dsun.java.command", &tail) &&
2133 !match_option(option, "-Dsun.java.launcher", &tail)) {
2134
2135 // add all jvm options to the jvm_args string. This string
2136 // is used later to set the java.vm.args PerfData string constant.
2137 // the -Djava.class.path and the -Dsun.java.command options are
2138 // omitted from jvm_args string as each have their own PerfData
2139 // string constant object.
2140 build_jvm_args(option->optionString);
2141 }
2142
2143 // -verbose:[class/module/gc/jni]
2144 if (match_option(option, "-verbose", &tail)) {
2145 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2146 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2147 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2148 } else if (!strcmp(tail, ":module")) {
2149 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2150 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2151 } else if (!strcmp(tail, ":gc")) {
2152 if (_legacyGCLogging.lastFlag == 0) {
2153 _legacyGCLogging.lastFlag = 1;
2154 }
2155 } else if (!strcmp(tail, ":jni")) {
2156 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2157 }
2158 // -da / -ea / -disableassertions / -enableassertions
2159 // These accept an optional class/package name separated by a colon, e.g.,
2160 // -da:java.lang.Thread.
2161 } else if (match_option(option, user_assertion_options, &tail, true)) {
2162 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2163 if (*tail == '\0') {
2164 JavaAssertions::setUserClassDefault(enable);
2165 } else {
2166 assert(*tail == ':', "bogus match by match_option()");
2167 JavaAssertions::addOption(tail + 1, enable);
2168 }
2169 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2170 } else if (match_option(option, system_assertion_options, &tail, false)) {
2171 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2172 JavaAssertions::setSystemClassDefault(enable);
2173 // -bootclasspath:
2174 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2175 jio_fprintf(defaultStream::output_stream(),
2176 "-Xbootclasspath is no longer a supported option.\n");
2177 return JNI_EINVAL;
2178 // -bootclasspath/a:
2179 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2180 Arguments::append_sysclasspath(tail);
2181 // -bootclasspath/p:
2182 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2183 jio_fprintf(defaultStream::output_stream(),
2184 "-Xbootclasspath/p is no longer a supported option.\n");
2185 return JNI_EINVAL;
2186 // -Xrun
2187 } else if (match_option(option, "-Xrun", &tail)) {
2188 if (tail != nullptr) {
2189 const char* pos = strchr(tail, ':');
2190 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2191 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2192 jio_snprintf(name, len + 1, "%s", tail);
2193
2194 char *options = nullptr;
2195 if(pos != nullptr) {
2196 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2197 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2198 }
2199 #if !INCLUDE_JVMTI
2200 if (strcmp(name, "jdwp") == 0) {
2201 jio_fprintf(defaultStream::error_stream(),
2202 "Debugging agents are not supported in this VM\n");
2203 return JNI_ERR;
2204 }
2205 #endif // !INCLUDE_JVMTI
2206 JvmtiAgentList::add_xrun(name, options, false);
2207 FREE_C_HEAP_ARRAY(char, name);
2208 FREE_C_HEAP_ARRAY(char, options);
2209 }
2210 } else if (match_option(option, "--add-reads=", &tail)) {
2211 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2212 return JNI_ENOMEM;
2213 }
2214 } else if (match_option(option, "--add-exports=", &tail)) {
2215 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2216 return JNI_ENOMEM;
2217 }
2218 } else if (match_option(option, "--add-opens=", &tail)) {
2219 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2220 return JNI_ENOMEM;
2221 }
2222 } else if (match_option(option, "--add-modules=", &tail)) {
2223 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2224 return JNI_ENOMEM;
2225 }
2226 #if INCLUDE_JVMCI
2227 if (!_jvmci_module_added) {
2228 const char *jvmci_module = strstr(tail, "jdk.internal.vm.ci");
2229 if (jvmci_module != nullptr) {
2230 char before = *(jvmci_module - 1);
2231 char after = *(jvmci_module + strlen("jdk.internal.vm.ci"));
2232 if ((before == '=' || before == ',') && (after == '\0' || after == ',')) {
2233 FLAG_SET_DEFAULT(EnableJVMCI, true);
2234 _jvmci_module_added = true;
2235 }
2236 }
2237 }
2238 #endif
2239 } else if (match_option(option, "--enable-native-access=", &tail)) {
2240 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2241 return JNI_ENOMEM;
2242 }
2243 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2244 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2245 return JNI_ENOMEM;
2246 }
2247 } else if (match_option(option, "--limit-modules=", &tail)) {
2248 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2249 return JNI_ENOMEM;
2250 }
2251 } else if (match_option(option, "--module-path=", &tail)) {
2252 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2253 return JNI_ENOMEM;
2254 }
2255 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2256 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2257 return JNI_ENOMEM;
2258 }
2259 } else if (match_option(option, "--patch-module=", &tail)) {
2260 // --patch-module=<module>=<file>(<pathsep><file>)*
2261 int res = process_patch_mod_option(tail);
2262 if (res != JNI_OK) {
2263 return res;
2264 }
2265 } else if (match_option(option, "--enable-final-field-mutation=", &tail)) {
2266 if (!create_numbered_module_property("jdk.module.enable.final.field.mutation", tail, enable_final_field_mutation++)) {
2267 return JNI_ENOMEM;
2268 }
2269 } else if (match_option(option, "--illegal-final-field-mutation=", &tail)) {
2270 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2271 PropertyList_unique_add(&_system_properties, "jdk.module.illegal.final.field.mutation", tail,
2272 AddProperty, WriteableProperty, InternalProperty);
2273 } else {
2274 jio_fprintf(defaultStream::error_stream(),
2275 "Value specified to --illegal-final-field-mutation not recognized: '%s'\n", tail);
2276 return JNI_ERR;
2277 }
2278 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2279 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2280 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2281 AddProperty, WriteableProperty, InternalProperty);
2282 } else {
2283 jio_fprintf(defaultStream::error_stream(),
2284 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2285 return JNI_ERR;
2286 }
2287 } else if (match_option(option, "--illegal-access=", &tail)) {
2288 char version[256];
2289 JDK_Version::jdk(17).to_string(version, sizeof(version));
2290 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2291 // -agentlib and -agentpath
2292 } else if (match_option(option, "-agentlib:", &tail) ||
2293 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2294 if(tail != nullptr) {
2295 const char* pos = strchr(tail, '=');
2296 char* name;
2297 if (pos == nullptr) {
2298 name = os::strdup_check_oom(tail, mtArguments);
2299 } else {
2300 size_t len = pos - tail;
2301 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2302 memcpy(name, tail, len);
2303 name[len] = '\0';
2304 }
2305
2306 char *options = nullptr;
2307 if(pos != nullptr) {
2308 options = os::strdup_check_oom(pos + 1, mtArguments);
2309 }
2310 #if !INCLUDE_JVMTI
2311 if (valid_jdwp_agent(name, is_absolute_path)) {
2312 jio_fprintf(defaultStream::error_stream(),
2313 "Debugging agents are not supported in this VM\n");
2314 return JNI_ERR;
2315 }
2316 #elif INCLUDE_CDS
2317 if (valid_jdwp_agent(name, is_absolute_path)) {
2318 _has_jdwp_agent = true;
2319 }
2320 #endif // !INCLUDE_JVMTI
2321 JvmtiAgentList::add(name, options, is_absolute_path);
2322 os::free(name);
2323 os::free(options);
2324 }
2325 // -javaagent
2326 } else if (match_option(option, "-javaagent:", &tail)) {
2327 #if !INCLUDE_JVMTI
2328 jio_fprintf(defaultStream::error_stream(),
2329 "Instrumentation agents are not supported in this VM\n");
2330 return JNI_ERR;
2331 #else
2332 if (tail != nullptr) {
2333 size_t length = strlen(tail) + 1;
2334 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2335 jio_snprintf(options, length, "%s", tail);
2336 JvmtiAgentList::add("instrument", options, false);
2337 FREE_C_HEAP_ARRAY(char, options);
2338
2339 // java agents need module java.instrument
2340 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2341 return JNI_ENOMEM;
2342 }
2343 }
2344 #endif // !INCLUDE_JVMTI
2345 // --enable_preview
2346 } else if (match_option(option, "--enable-preview")) {
2347 set_enable_preview();
2348 // -Xnoclassgc
2349 } else if (match_option(option, "-Xnoclassgc")) {
2350 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2351 return JNI_EINVAL;
2352 }
2353 // -Xbatch
2354 } else if (match_option(option, "-Xbatch")) {
2355 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2356 return JNI_EINVAL;
2357 }
2358 // -Xmn for compatibility with other JVM vendors
2359 } else if (match_option(option, "-Xmn", &tail)) {
2360 julong long_initial_young_size = 0;
2361 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2362 if (errcode != arg_in_range) {
2363 jio_fprintf(defaultStream::error_stream(),
2364 "Invalid initial young generation size: %s\n", option->optionString);
2365 describe_range_error(errcode);
2366 return JNI_EINVAL;
2367 }
2368 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2369 return JNI_EINVAL;
2370 }
2371 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2372 return JNI_EINVAL;
2373 }
2374 // -Xms
2375 } else if (match_option(option, "-Xms", &tail)) {
2376 julong size = 0;
2377 // an initial heap size of 0 means automatically determine
2378 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2379 if (errcode != arg_in_range) {
2380 jio_fprintf(defaultStream::error_stream(),
2381 "Invalid initial heap size: %s\n", option->optionString);
2382 describe_range_error(errcode);
2383 return JNI_EINVAL;
2384 }
2385 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2386 return JNI_EINVAL;
2387 }
2388 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2389 return JNI_EINVAL;
2390 }
2391 // -Xmx
2392 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2393 julong long_max_heap_size = 0;
2394 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2395 if (errcode != arg_in_range) {
2396 jio_fprintf(defaultStream::error_stream(),
2397 "Invalid maximum heap size: %s\n", option->optionString);
2398 describe_range_error(errcode);
2399 return JNI_EINVAL;
2400 }
2401 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2402 return JNI_EINVAL;
2403 }
2404 // Xmaxf
2405 } else if (match_option(option, "-Xmaxf", &tail)) {
2406 char* err;
2407 double dmaxf = strtod(tail, &err);
2408 if (*err != '\0' || *tail == '\0') {
2409 jio_fprintf(defaultStream::error_stream(),
2410 "Bad max heap free ratio: %s\n",
2411 option->optionString);
2412 return JNI_EINVAL;
2413 }
2414 if (dmaxf < 0.0 || dmaxf > 1.0) {
2415 jio_fprintf(defaultStream::error_stream(),
2416 "-Xmaxf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2417 option->optionString);
2418 return JNI_EINVAL;
2419 }
2420 const uintx umaxf = (uintx)(dmaxf * 100);
2421 if (MinHeapFreeRatio > umaxf) {
2422 jio_fprintf(defaultStream::error_stream(),
2423 "-Xmaxf value (%s) must be greater than or equal to the implicit -Xminf value (%.2f)\n",
2424 tail, MinHeapFreeRatio / 100.0f);
2425 return JNI_EINVAL;
2426 }
2427 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, umaxf) != JVMFlag::SUCCESS) {
2428 return JNI_EINVAL;
2429 }
2430 // Xminf
2431 } else if (match_option(option, "-Xminf", &tail)) {
2432 char* err;
2433 double dminf = strtod(tail, &err);
2434 if (*err != '\0' || *tail == '\0') {
2435 jio_fprintf(defaultStream::error_stream(),
2436 "Bad min heap free ratio: %s\n",
2437 option->optionString);
2438 return JNI_EINVAL;
2439 }
2440 if (dminf < 0.0 || dminf > 1.0) {
2441 jio_fprintf(defaultStream::error_stream(),
2442 "-Xminf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2443 tail);
2444 return JNI_EINVAL;
2445 }
2446 const uintx uminf = (uintx)(dminf * 100);
2447 if (MaxHeapFreeRatio < uminf) {
2448 jio_fprintf(defaultStream::error_stream(),
2449 "-Xminf value (%s) must be less than or equal to the implicit -Xmaxf value (%.2f)\n",
2450 tail, MaxHeapFreeRatio / 100.0f);
2451 return JNI_EINVAL;
2452 }
2453 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, uminf) != JVMFlag::SUCCESS) {
2454 return JNI_EINVAL;
2455 }
2456 // -Xss
2457 } else if (match_option(option, "-Xss", &tail)) {
2458 intx value = 0;
2459 jint err = parse_xss(option, tail, &value);
2460 if (err != JNI_OK) {
2461 return err;
2462 }
2463 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2464 return JNI_EINVAL;
2465 }
2466 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2467 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2468 if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2469 warning("Option -Xmaxjitcodesize was deprecated in JDK 26 and will likely be removed in a future release.");
2470 }
2471 julong long_ReservedCodeCacheSize = 0;
2472
2473 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2474 if (errcode != arg_in_range) {
2475 jio_fprintf(defaultStream::error_stream(),
2476 "Invalid maximum code cache size: %s.\n", option->optionString);
2477 return JNI_EINVAL;
2478 }
2479 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2480 return JNI_EINVAL;
2481 }
2482 // -green
2483 } else if (match_option(option, "-green")) {
2484 jio_fprintf(defaultStream::error_stream(),
2485 "Green threads support not available\n");
2486 return JNI_EINVAL;
2487 // -native
2488 } else if (match_option(option, "-native")) {
2489 // HotSpot always uses native threads, ignore silently for compatibility
2490 // -Xrs
2491 } else if (match_option(option, "-Xrs")) {
2492 // Classic/EVM option, new functionality
2493 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2494 return JNI_EINVAL;
2495 }
2496 // -Xprof
2497 } else if (match_option(option, "-Xprof")) {
2498 char version[256];
2499 // Obsolete in JDK 10
2500 JDK_Version::jdk(10).to_string(version, sizeof(version));
2501 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2502 // -Xinternalversion
2503 } else if (match_option(option, "-Xinternalversion")) {
2504 jio_fprintf(defaultStream::output_stream(), "%s\n",
2505 VM_Version::internal_vm_info_string());
2506 vm_exit(0);
2507 #ifndef PRODUCT
2508 // -Xprintflags
2509 } else if (match_option(option, "-Xprintflags")) {
2510 JVMFlag::printFlags(tty, false);
2511 vm_exit(0);
2512 #endif
2513 // -D
2514 } else if (match_option(option, "-D", &tail)) {
2515 const char* value;
2516 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2517 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2518 // abort if -Djava.endorsed.dirs is set
2519 jio_fprintf(defaultStream::output_stream(),
2520 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2521 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2522 return JNI_EINVAL;
2523 }
2524 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2525 *value != '\0' && strcmp(value, "\"\"") != 0) {
2526 // abort if -Djava.ext.dirs is set
2527 jio_fprintf(defaultStream::output_stream(),
2528 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2529 return JNI_EINVAL;
2530 }
2531 // Check for module related properties. They must be set using the modules
2532 // options. For example: use "--add-modules=java.sql", not
2533 // "-Djdk.module.addmods=java.sql"
2534 if (is_internal_module_property(option->optionString + 2)) {
2535 needs_module_property_warning = true;
2536 continue;
2537 }
2538 if (!add_property(tail)) {
2539 return JNI_ENOMEM;
2540 }
2541 // Out of the box management support
2542 if (match_option(option, "-Dcom.sun.management", &tail)) {
2543 #if INCLUDE_MANAGEMENT
2544 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2545 return JNI_EINVAL;
2546 }
2547 // management agent in module jdk.management.agent
2548 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2549 return JNI_ENOMEM;
2550 }
2551 #else
2552 jio_fprintf(defaultStream::output_stream(),
2553 "-Dcom.sun.management is not supported in this VM.\n");
2554 return JNI_ERR;
2555 #endif
2556 }
2557 // -Xint
2558 } else if (match_option(option, "-Xint")) {
2559 set_mode_flags(_int);
2560 mode_flag_cmd_line = true;
2561 // -Xmixed
2562 } else if (match_option(option, "-Xmixed")) {
2563 set_mode_flags(_mixed);
2564 mode_flag_cmd_line = true;
2565 // -Xcomp
2566 } else if (match_option(option, "-Xcomp")) {
2567 // for testing the compiler; turn off all flags that inhibit compilation
2568 set_mode_flags(_comp);
2569 mode_flag_cmd_line = true;
2570 // -Xshare:dump
2571 } else if (match_option(option, "-Xshare:dump")) {
2572 CDSConfig::enable_dumping_static_archive();
2573 CDSConfig::set_old_cds_flags_used();
2574 // -Xshare:on
2575 } else if (match_option(option, "-Xshare:on")) {
2576 UseSharedSpaces = true;
2577 RequireSharedSpaces = true;
2578 CDSConfig::set_old_cds_flags_used();
2579 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2580 } else if (match_option(option, "-Xshare:auto")) {
2581 UseSharedSpaces = true;
2582 RequireSharedSpaces = false;
2583 xshare_auto_cmd_line = true;
2584 CDSConfig::set_old_cds_flags_used();
2585 // -Xshare:off
2586 } else if (match_option(option, "-Xshare:off")) {
2587 UseSharedSpaces = false;
2588 RequireSharedSpaces = false;
2589 CDSConfig::set_old_cds_flags_used();
2590 // -Xverify
2591 } else if (match_option(option, "-Xverify", &tail)) {
2592 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2593 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2594 return JNI_EINVAL;
2595 }
2596 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2597 return JNI_EINVAL;
2598 }
2599 } else if (strcmp(tail, ":remote") == 0) {
2600 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2601 return JNI_EINVAL;
2602 }
2603 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2604 return JNI_EINVAL;
2605 }
2606 } else if (strcmp(tail, ":none") == 0) {
2607 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2608 return JNI_EINVAL;
2609 }
2610 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2611 return JNI_EINVAL;
2612 }
2613 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2614 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2615 return JNI_EINVAL;
2616 }
2617 // -Xdebug
2618 } else if (match_option(option, "-Xdebug")) {
2619 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2620 } else if (match_option(option, "-Xloggc:", &tail)) {
2621 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2622 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2623 _legacyGCLogging.lastFlag = 2;
2624 _legacyGCLogging.file = os::strdup_check_oom(tail);
2625 } else if (match_option(option, "-Xlog", &tail)) {
2626 bool ret = false;
2627 if (strcmp(tail, ":help") == 0) {
2628 fileStream stream(defaultStream::output_stream());
2629 LogConfiguration::print_command_line_help(&stream);
2630 vm_exit(0);
2631 } else if (strcmp(tail, ":disable") == 0) {
2632 LogConfiguration::disable_logging();
2633 ret = true;
2634 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2635 const char* async_tail = tail + strlen(":async");
2636 ret = LogConfiguration::parse_async_argument(async_tail);
2637 } else if (*tail == '\0') {
2638 ret = LogConfiguration::parse_command_line_arguments();
2639 assert(ret, "-Xlog without arguments should never fail to parse");
2640 } else if (*tail == ':') {
2641 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2642 }
2643 if (ret == false) {
2644 jio_fprintf(defaultStream::error_stream(),
2645 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2646 tail);
2647 return JNI_EINVAL;
2648 }
2649 // JNI hooks
2650 } else if (match_option(option, "-Xcheck", &tail)) {
2651 if (!strcmp(tail, ":jni")) {
2652 #if !INCLUDE_JNI_CHECK
2653 warning("JNI CHECKING is not supported in this VM");
2654 #else
2655 CheckJNICalls = true;
2656 #endif // INCLUDE_JNI_CHECK
2657 } else if (is_bad_option(option, args->ignoreUnrecognized,
2658 "check")) {
2659 return JNI_EINVAL;
2660 }
2661 } else if (match_option(option, "vfprintf")) {
2662 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2663 } else if (match_option(option, "exit")) {
2664 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2665 } else if (match_option(option, "abort")) {
2666 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2667 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2668 // and the last option wins.
2669 } else if (match_option(option, "-XX:+NeverTenure")) {
2670 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2671 return JNI_EINVAL;
2672 }
2673 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2674 return JNI_EINVAL;
2675 }
2676 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2677 return JNI_EINVAL;
2678 }
2679 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2680 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2681 return JNI_EINVAL;
2682 }
2683 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2684 return JNI_EINVAL;
2685 }
2686 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2687 return JNI_EINVAL;
2688 }
2689 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2690 uint max_tenuring_thresh = 0;
2691 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2692 jio_fprintf(defaultStream::error_stream(),
2693 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2694 return JNI_EINVAL;
2695 }
2696
2697 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2698 return JNI_EINVAL;
2699 }
2700
2701 if (MaxTenuringThreshold == 0) {
2702 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2703 return JNI_EINVAL;
2704 }
2705 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2706 return JNI_EINVAL;
2707 }
2708 } else {
2709 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2710 return JNI_EINVAL;
2711 }
2712 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2713 return JNI_EINVAL;
2714 }
2715 }
2716 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2717 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2718 return JNI_EINVAL;
2719 }
2720 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2721 return JNI_EINVAL;
2722 }
2723 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2724 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2725 return JNI_EINVAL;
2726 }
2727 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2728 return JNI_EINVAL;
2729 }
2730 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2731 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2732 return JNI_EINVAL;
2733 }
2734 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2735 return JNI_EINVAL;
2736 }
2737 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2738 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2739 return JNI_EINVAL;
2740 }
2741 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2742 return JNI_EINVAL;
2743 }
2744 } else if (match_option(option, "--finalization=", &tail)) {
2745 if (strcmp(tail, "enabled") == 0) {
2746 InstanceKlass::set_finalization_enabled(true);
2747 } else if (strcmp(tail, "disabled") == 0) {
2748 InstanceKlass::set_finalization_enabled(false);
2749 } else {
2750 jio_fprintf(defaultStream::error_stream(),
2751 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2752 tail);
2753 return JNI_EINVAL;
2754 }
2755 #if !defined(DTRACE_ENABLED)
2756 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2757 jio_fprintf(defaultStream::error_stream(),
2758 "DTraceMethodProbes flag is not applicable for this configuration\n");
2759 return JNI_EINVAL;
2760 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2761 jio_fprintf(defaultStream::error_stream(),
2762 "DTraceAllocProbes flag is not applicable for this configuration\n");
2763 return JNI_EINVAL;
2764 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2765 jio_fprintf(defaultStream::error_stream(),
2766 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2767 return JNI_EINVAL;
2768 #endif // !defined(DTRACE_ENABLED)
2769 #ifdef ASSERT
2770 } else if (match_option(option, "-XX:+FullGCALot")) {
2771 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2772 return JNI_EINVAL;
2773 }
2774 #endif
2775 #if !INCLUDE_MANAGEMENT
2776 } else if (match_option(option, "-XX:+ManagementServer")) {
2777 jio_fprintf(defaultStream::error_stream(),
2778 "ManagementServer is not supported in this VM.\n");
2779 return JNI_ERR;
2780 #endif // INCLUDE_MANAGEMENT
2781 #if INCLUDE_JVMCI
2782 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2783 if (EnableJVMCIProduct) {
2784 jio_fprintf(defaultStream::error_stream(),
2785 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2786 return JNI_EINVAL;
2787 }
2788 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2789 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2790 if (use_graal_jit) {
2791 const char* jvmci_compiler = get_property("jvmci.Compiler");
2792 if (jvmci_compiler != nullptr) {
2793 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2794 jio_fprintf(defaultStream::error_stream(),
2795 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2796 return JNI_ERR;
2797 }
2798 } else if (!add_property("jvmci.Compiler=graal")) {
2799 return JNI_ENOMEM;
2800 }
2801 }
2802
2803 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2804 if (EnableJVMCIProduct) {
2805 continue;
2806 }
2807 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2808 // Allow this flag if it has been unlocked.
2809 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2810 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2811 jio_fprintf(defaultStream::error_stream(),
2812 "Unable to enable JVMCI in product mode\n");
2813 return JNI_ERR;
2814 }
2815 }
2816 // The flag was locked so process normally to report that error
2817 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2818 return JNI_EINVAL;
2819 }
2820 #endif // INCLUDE_JVMCI
2821 #if INCLUDE_JFR
2822 } else if (match_jfr_option(&option)) {
2823 return JNI_EINVAL;
2824 #endif
2825 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2826 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2827 // already been handled
2828 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2829 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2830 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2831 return JNI_EINVAL;
2832 }
2833 }
2834 // Unknown option
2835 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2836 return JNI_ERR;
2837 }
2838 }
2839
2840 // PrintSharedArchiveAndExit will turn on
2841 // -Xshare:on
2842 // -Xlog:class+path=info
2843 if (PrintSharedArchiveAndExit) {
2844 UseSharedSpaces = true;
2845 RequireSharedSpaces = true;
2846 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2847 }
2848
2849 fix_appclasspath();
2850
2851 return JNI_OK;
2852 }
2853
2854 void Arguments::set_ext_dirs(char *value) {
2855 _ext_dirs = os::strdup_check_oom(value);
2856 }
2857
2858 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) {
2859 // For java.base check for duplicate --patch-module options being specified on the command line.
2860 // This check is only required for java.base, all other duplicate module specifications
2861 // will be checked during module system initialization. The module system initialization
2862 // will throw an ExceptionInInitializerError if this situation occurs.
2863 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2864 if (patch_mod_javabase) {
2865 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2866 } else {
2867 patch_mod_javabase = true;
2868 }
2869 }
2870
2871 // Create GrowableArray lazily, only if --patch-module has been specified
2872 if (_patch_mod_prefix == nullptr) {
2873 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2874 }
2875
2876 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2877 }
2878
2879 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2880 //
2881 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2882 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2883 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2884 // path is treated as the current directory.
2885 //
2886 // This causes problems with CDS, which requires that all directories specified in the classpath
2887 // must be empty. In most cases, applications do NOT want to load classes from the current
2888 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2889 // scripts compatible with CDS.
2890 void Arguments::fix_appclasspath() {
2891 if (IgnoreEmptyClassPaths) {
2892 const char separator = *os::path_separator();
2893 const char* src = _java_class_path->value();
2894
2895 // skip over all the leading empty paths
2896 while (*src == separator) {
2897 src ++;
2898 }
2899
2900 char* copy = os::strdup_check_oom(src, mtArguments);
2901
2902 // trim all trailing empty paths
2903 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2904 *tail = '\0';
2905 }
2906
2907 char from[3] = {separator, separator, '\0'};
2908 char to [2] = {separator, '\0'};
2909 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2910 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2911 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2912 }
2913
2914 _java_class_path->set_writeable_value(copy);
2915 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2916 }
2917 }
2918
2919 jint Arguments::finalize_vm_init_args() {
2920 // check if the default lib/endorsed directory exists; if so, error
2921 char path[JVM_MAXPATHLEN];
2922 const char* fileSep = os::file_separator();
2923 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2924
2925 DIR* dir = os::opendir(path);
2926 if (dir != nullptr) {
2927 jio_fprintf(defaultStream::output_stream(),
2928 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2929 "in modular form will be supported via the concept of upgradeable modules.\n");
2930 os::closedir(dir);
2931 return JNI_ERR;
2932 }
2933
2934 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2935 dir = os::opendir(path);
2936 if (dir != nullptr) {
2937 jio_fprintf(defaultStream::output_stream(),
2938 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2939 "Use -classpath instead.\n.");
2940 os::closedir(dir);
2941 return JNI_ERR;
2942 }
2943
2944 // This must be done after all arguments have been processed
2945 // and the container support has been initialized since AggressiveHeap
2946 // relies on the amount of total memory available.
2947 if (AggressiveHeap) {
2948 jint result = set_aggressive_heap_flags();
2949 if (result != JNI_OK) {
2950 return result;
2951 }
2952 }
2953
2954 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2955 // but like -Xint, leave compilation thresholds unaffected.
2956 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2957 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2958 set_mode_flags(_int);
2959 }
2960
2961 #ifdef ZERO
2962 // Zero always runs in interpreted mode
2963 set_mode_flags(_int);
2964 #endif
2965
2966 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2967 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2968 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2969 }
2970
2971 #if !COMPILER2_OR_JVMCI
2972 // Don't degrade server performance for footprint
2973 if (FLAG_IS_DEFAULT(UseLargePages) &&
2974 MaxHeapSize < LargePageHeapSizeThreshold) {
2975 // No need for large granularity pages w/small heaps.
2976 // Note that large pages are enabled/disabled for both the
2977 // Java heap and the code cache.
2978 FLAG_SET_DEFAULT(UseLargePages, false);
2979 }
2980
2981 UNSUPPORTED_OPTION(ProfileInterpreter);
2982 #endif
2983
2984 // Parse the CompilationMode flag
2985 if (!CompilationModeFlag::initialize()) {
2986 return JNI_ERR;
2987 }
2988
2989 ClassLoader::set_preview_mode(is_valhalla_enabled());
2990
2991 if (!check_vm_args_consistency()) {
2992 return JNI_ERR;
2993 }
2994
2995
2996 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2997 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2998 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2999
3000 return JNI_OK;
3001 }
3002
3003 // Helper class for controlling the lifetime of JavaVMInitArgs
3004 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3005 // deleted on the destruction of the ScopedVMInitArgs object.
3006 class ScopedVMInitArgs : public StackObj {
3007 private:
3008 JavaVMInitArgs _args;
3009 char* _container_name;
3010 bool _is_set;
3011 char* _vm_options_file_arg;
3012
3013 public:
3014 ScopedVMInitArgs(const char *container_name) {
3015 _args.version = JNI_VERSION_1_2;
3016 _args.nOptions = 0;
3017 _args.options = nullptr;
3018 _args.ignoreUnrecognized = false;
3019 _container_name = (char *)container_name;
3020 _is_set = false;
3021 _vm_options_file_arg = nullptr;
3022 }
3023
3024 // Populates the JavaVMInitArgs object represented by this
3025 // ScopedVMInitArgs object with the arguments in options. The
3026 // allocated memory is deleted by the destructor. If this method
3027 // returns anything other than JNI_OK, then this object is in a
3028 // partially constructed state, and should be abandoned.
3029 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3030 _is_set = true;
3031 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3032 JavaVMOption, options->length(), mtArguments);
3033 if (options_arr == nullptr) {
3034 return JNI_ENOMEM;
3035 }
3036 _args.options = options_arr;
3037
3038 for (int i = 0; i < options->length(); i++) {
3039 options_arr[i] = options->at(i);
3040 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3041 if (options_arr[i].optionString == nullptr) {
3042 // Rely on the destructor to do cleanup.
3043 _args.nOptions = i;
3044 return JNI_ENOMEM;
3045 }
3046 }
3047
3048 _args.nOptions = options->length();
3049 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3050 return JNI_OK;
3051 }
3052
3053 JavaVMInitArgs* get() { return &_args; }
3054 char* container_name() { return _container_name; }
3055 bool is_set() { return _is_set; }
3056 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3057 char* vm_options_file_arg() { return _vm_options_file_arg; }
3058
3059 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3060 if (_vm_options_file_arg != nullptr) {
3061 os::free(_vm_options_file_arg);
3062 }
3063 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3064 }
3065
3066 ~ScopedVMInitArgs() {
3067 if (_vm_options_file_arg != nullptr) {
3068 os::free(_vm_options_file_arg);
3069 }
3070 if (_args.options == nullptr) return;
3071 for (int i = 0; i < _args.nOptions; i++) {
3072 os::free(_args.options[i].optionString);
3073 }
3074 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3075 }
3076
3077 // Insert options into this option list, to replace option at
3078 // vm_options_file_pos (-XX:VMOptionsFile)
3079 jint insert(const JavaVMInitArgs* args,
3080 const JavaVMInitArgs* args_to_insert,
3081 const int vm_options_file_pos) {
3082 assert(_args.options == nullptr, "shouldn't be set yet");
3083 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3084 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3085
3086 int length = args->nOptions + args_to_insert->nOptions - 1;
3087 // Construct new option array
3088 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3089 for (int i = 0; i < args->nOptions; i++) {
3090 if (i == vm_options_file_pos) {
3091 // insert the new options starting at the same place as the
3092 // -XX:VMOptionsFile option
3093 for (int j = 0; j < args_to_insert->nOptions; j++) {
3094 options.push(args_to_insert->options[j]);
3095 }
3096 } else {
3097 options.push(args->options[i]);
3098 }
3099 }
3100 // make into options array
3101 return set_args(&options);
3102 }
3103 };
3104
3105 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3106 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3107 }
3108
3109 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3110 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3111 }
3112
3113 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) {
3114 for (int index = args->nOptions - 1; index >= 0; index--) {
3115 JavaVMOption* option = args->options + index;
3116 if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) {
3117 return option;
3118 }
3119 }
3120
3121 return nullptr;
3122 }
3123
3124 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args,
3125 ScopedVMInitArgs* jdk_aot_vm_options_args) {
3126 // Don't bother scanning all the args if this env variable is not set
3127 if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) {
3128 return JNI_OK;
3129 }
3130
3131 // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value
3132 // of AOTMode.
3133 JavaVMOption* option = nullptr;
3134 for (int i = all_args->length() - 1; i >= 0; i--) {
3135 if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) {
3136 break;
3137 }
3138 }
3139
3140 if (option != nullptr) {
3141 // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet,
3142 // so its value is not reflected inside the global variable AOTMode.
3143 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) {
3144 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3145 }
3146 } else {
3147 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode,
3148 // which would have been set inside process_settings_file();
3149 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) {
3150 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3151 }
3152 }
3153
3154 return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args);
3155 }
3156
3157 jint Arguments::parse_options_environment_variable(const char* name,
3158 ScopedVMInitArgs* vm_args) {
3159 char *buffer = ::getenv(name);
3160
3161 // Don't check this environment variable if user has special privileges
3162 // (e.g. unix su command).
3163 if (buffer == nullptr || os::have_special_privileges()) {
3164 return JNI_OK;
3165 }
3166
3167 if ((buffer = os::strdup(buffer)) == nullptr) {
3168 return JNI_ENOMEM;
3169 }
3170
3171 jio_fprintf(defaultStream::error_stream(),
3172 "Picked up %s: %s\n", name, buffer);
3173
3174 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3175
3176 os::free(buffer);
3177 return retcode;
3178 }
3179
3180 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3181 // read file into buffer
3182 int fd = ::open(file_name, O_RDONLY);
3183 if (fd < 0) {
3184 jio_fprintf(defaultStream::error_stream(),
3185 "Could not open options file '%s'\n",
3186 file_name);
3187 return JNI_ERR;
3188 }
3189
3190 struct stat stbuf;
3191 int retcode = os::stat(file_name, &stbuf);
3192 if (retcode != 0) {
3193 jio_fprintf(defaultStream::error_stream(),
3194 "Could not stat options file '%s'\n",
3195 file_name);
3196 ::close(fd);
3197 return JNI_ERR;
3198 }
3199
3200 if (stbuf.st_size == 0) {
3201 // tell caller there is no option data and that is ok
3202 ::close(fd);
3203 return JNI_OK;
3204 }
3205
3206 // '+ 1' for null termination even with max bytes
3207 size_t bytes_alloc = stbuf.st_size + 1;
3208
3209 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3210 if (nullptr == buf) {
3211 jio_fprintf(defaultStream::error_stream(),
3212 "Could not allocate read buffer for options file parse\n");
3213 ::close(fd);
3214 return JNI_ENOMEM;
3215 }
3216
3217 memset(buf, 0, bytes_alloc);
3218
3219 // Fill buffer
3220 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3221 ::close(fd);
3222 if (bytes_read < 0) {
3223 FREE_C_HEAP_ARRAY(char, buf);
3224 jio_fprintf(defaultStream::error_stream(),
3225 "Could not read options file '%s'\n", file_name);
3226 return JNI_ERR;
3227 }
3228
3229 if (bytes_read == 0) {
3230 // tell caller there is no option data and that is ok
3231 FREE_C_HEAP_ARRAY(char, buf);
3232 return JNI_OK;
3233 }
3234
3235 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3236
3237 FREE_C_HEAP_ARRAY(char, buf);
3238 return retcode;
3239 }
3240
3241 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3242 // Construct option array
3243 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3244
3245 // some pointers to help with parsing
3246 char *buffer_end = buffer + buf_len;
3247 char *opt_hd = buffer;
3248 char *wrt = buffer;
3249 char *rd = buffer;
3250
3251 // parse all options
3252 while (rd < buffer_end) {
3253 // skip leading white space from the input string
3254 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3255 rd++;
3256 }
3257
3258 if (rd >= buffer_end) {
3259 break;
3260 }
3261
3262 // Remember this is where we found the head of the token.
3263 opt_hd = wrt;
3264
3265 // Tokens are strings of non white space characters separated
3266 // by one or more white spaces.
3267 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3268 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3269 int quote = *rd; // matching quote to look for
3270 rd++; // don't copy open quote
3271 while (rd < buffer_end && *rd != quote) {
3272 // include everything (even spaces)
3273 // up until the close quote
3274 *wrt++ = *rd++; // copy to option string
3275 }
3276
3277 if (rd < buffer_end) {
3278 rd++; // don't copy close quote
3279 } else {
3280 // did not see closing quote
3281 jio_fprintf(defaultStream::error_stream(),
3282 "Unmatched quote in %s\n", name);
3283 return JNI_ERR;
3284 }
3285 } else {
3286 *wrt++ = *rd++; // copy to option string
3287 }
3288 }
3289
3290 // steal a white space character and set it to null
3291 *wrt++ = '\0';
3292 // We now have a complete token
3293
3294 JavaVMOption option;
3295 option.optionString = opt_hd;
3296 option.extraInfo = nullptr;
3297
3298 options.append(option); // Fill in option
3299
3300 rd++; // Advance to next character
3301 }
3302
3303 // Fill out JavaVMInitArgs structure.
3304 return vm_args->set_args(&options);
3305 }
3306
3307 #ifndef PRODUCT
3308 // Determine whether LogVMOutput should be implicitly turned on.
3309 static bool use_vm_log() {
3310 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3311 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3312 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3313 PrintAssembly || TraceDeoptimization ||
3314 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3315 return true;
3316 }
3317
3318 #ifdef COMPILER1
3319 if (PrintC1Statistics) {
3320 return true;
3321 }
3322 #endif // COMPILER1
3323
3324 #ifdef COMPILER2
3325 if (PrintOptoAssembly || PrintOptoStatistics) {
3326 return true;
3327 }
3328 #endif // COMPILER2
3329
3330 return false;
3331 }
3332
3333 #endif // PRODUCT
3334
3335 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3336 for (int index = 0; index < args->nOptions; index++) {
3337 const JavaVMOption* option = args->options + index;
3338 const char* tail;
3339 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3340 return true;
3341 }
3342 }
3343 return false;
3344 }
3345
3346 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3347 const char* vm_options_file,
3348 const int vm_options_file_pos,
3349 ScopedVMInitArgs* vm_options_file_args,
3350 ScopedVMInitArgs* args_out) {
3351 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3352 if (code != JNI_OK) {
3353 return code;
3354 }
3355
3356 if (vm_options_file_args->get()->nOptions < 1) {
3357 return JNI_OK;
3358 }
3359
3360 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3361 jio_fprintf(defaultStream::error_stream(),
3362 "A VM options file may not refer to a VM options file. "
3363 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3364 "options file '%s' in options container '%s' is an error.\n",
3365 vm_options_file_args->vm_options_file_arg(),
3366 vm_options_file_args->container_name());
3367 return JNI_EINVAL;
3368 }
3369
3370 return args_out->insert(args, vm_options_file_args->get(),
3371 vm_options_file_pos);
3372 }
3373
3374 // Expand -XX:VMOptionsFile found in args_in as needed.
3375 // mod_args and args_out parameters may return values as needed.
3376 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3377 ScopedVMInitArgs* mod_args,
3378 JavaVMInitArgs** args_out) {
3379 jint code = match_special_option_and_act(args_in, mod_args);
3380 if (code != JNI_OK) {
3381 return code;
3382 }
3383
3384 if (mod_args->is_set()) {
3385 // args_in contains -XX:VMOptionsFile and mod_args contains the
3386 // original options from args_in along with the options expanded
3387 // from the VMOptionsFile. Return a short-hand to the caller.
3388 *args_out = mod_args->get();
3389 } else {
3390 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3391 }
3392 return JNI_OK;
3393 }
3394
3395 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3396 ScopedVMInitArgs* args_out) {
3397 // Remaining part of option string
3398 const char* tail;
3399 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3400
3401 for (int index = 0; index < args->nOptions; index++) {
3402 const JavaVMOption* option = args->options + index;
3403 if (match_option(option, "-XX:Flags=", &tail)) {
3404 Arguments::set_jvm_flags_file(tail);
3405 continue;
3406 }
3407 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3408 if (vm_options_file_args.found_vm_options_file_arg()) {
3409 jio_fprintf(defaultStream::error_stream(),
3410 "The option '%s' is already specified in the options "
3411 "container '%s' so the specification of '%s' in the "
3412 "same options container is an error.\n",
3413 vm_options_file_args.vm_options_file_arg(),
3414 vm_options_file_args.container_name(),
3415 option->optionString);
3416 return JNI_EINVAL;
3417 }
3418 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3419 // If there's a VMOptionsFile, parse that
3420 jint code = insert_vm_options_file(args, tail, index,
3421 &vm_options_file_args, args_out);
3422 if (code != JNI_OK) {
3423 return code;
3424 }
3425 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3426 if (args_out->is_set()) {
3427 // The VMOptions file inserted some options so switch 'args'
3428 // to the new set of options, and continue processing which
3429 // preserves "last option wins" semantics.
3430 args = args_out->get();
3431 // The first option from the VMOptionsFile replaces the
3432 // current option. So we back track to process the
3433 // replacement option.
3434 index--;
3435 }
3436 continue;
3437 }
3438 if (match_option(option, "-XX:+PrintVMOptions")) {
3439 PrintVMOptions = true;
3440 continue;
3441 }
3442 if (match_option(option, "-XX:-PrintVMOptions")) {
3443 PrintVMOptions = false;
3444 continue;
3445 }
3446 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3447 IgnoreUnrecognizedVMOptions = true;
3448 continue;
3449 }
3450 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3451 IgnoreUnrecognizedVMOptions = false;
3452 continue;
3453 }
3454 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3455 JVMFlag::printFlags(tty, false);
3456 vm_exit(0);
3457 }
3458
3459 #ifndef PRODUCT
3460 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3461 JVMFlag::printFlags(tty, true);
3462 vm_exit(0);
3463 }
3464 #endif
3465 }
3466 return JNI_OK;
3467 }
3468
3469 static void print_options(const JavaVMInitArgs *args) {
3470 const char* tail;
3471 for (int index = 0; index < args->nOptions; index++) {
3472 const JavaVMOption *option = args->options + index;
3473 if (match_option(option, "-XX:", &tail)) {
3474 logOption(tail);
3475 }
3476 }
3477 }
3478
3479 bool Arguments::handle_deprecated_print_gc_flags() {
3480 if (PrintGC) {
3481 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3482 }
3483 if (PrintGCDetails) {
3484 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3485 }
3486
3487 if (_legacyGCLogging.lastFlag == 2) {
3488 // -Xloggc was used to specify a filename
3489 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3490
3491 LogTarget(Error, logging) target;
3492 LogStream errstream(target);
3493 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3494 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3495 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3496 }
3497 return true;
3498 }
3499
3500 static void apply_debugger_ergo() {
3501 #ifdef ASSERT
3502 if (ReplayCompiles) {
3503 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3504 }
3505
3506 if (UseDebuggerErgo) {
3507 // Turn on sub-flags
3508 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3509 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3510 }
3511
3512 if (UseDebuggerErgo2) {
3513 // Debugging with limited number of CPUs
3514 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3515 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3516 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3517 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3518 }
3519 #endif // ASSERT
3520 }
3521
3522 // Parse entry point called from JNI_CreateJavaVM
3523
3524 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3525 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3526 JVMFlag::check_all_flag_declarations();
3527
3528 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3529 const char* hotspotrc = ".hotspotrc";
3530 bool settings_file_specified = false;
3531 bool needs_hotspotrc_warning = false;
3532 ScopedVMInitArgs initial_vm_options_args("");
3533 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3534 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3535 ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'");
3536
3537 // Pointers to current working set of containers
3538 JavaVMInitArgs* cur_cmd_args;
3539 JavaVMInitArgs* cur_vm_options_args;
3540 JavaVMInitArgs* cur_java_options_args;
3541 JavaVMInitArgs* cur_java_tool_options_args;
3542 JavaVMInitArgs* cur_jdk_aot_vm_options_args;
3543
3544 // Containers for modified/expanded options
3545 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3546 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3547 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3548 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3549 ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'");
3550
3551 GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args;
3552
3553 jint code =
3554 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3555 if (code != JNI_OK) {
3556 return code;
3557 }
3558
3559 // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM.
3560 // This is an undocumented feature.
3561 code = parse_java_options_environment_variable(&initial_java_options_args);
3562 if (code != JNI_OK) {
3563 return code;
3564 }
3565
3566 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3567 char *vmoptions = ClassLoader::lookup_vm_options();
3568 if (vmoptions != nullptr) {
3569 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3570 FREE_C_HEAP_ARRAY(char, vmoptions);
3571 if (code != JNI_OK) {
3572 return code;
3573 }
3574 }
3575
3576 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3577 &mod_java_tool_options_args,
3578 &cur_java_tool_options_args);
3579 if (code != JNI_OK) {
3580 return code;
3581 }
3582
3583 code = expand_vm_options_as_needed(initial_cmd_args,
3584 &mod_cmd_args,
3585 &cur_cmd_args);
3586 if (code != JNI_OK) {
3587 return code;
3588 }
3589
3590 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3591 &mod_java_options_args,
3592 &cur_java_options_args);
3593 if (code != JNI_OK) {
3594 return code;
3595 }
3596
3597 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3598 &mod_vm_options_args,
3599 &cur_vm_options_args);
3600 if (code != JNI_OK) {
3601 return code;
3602 }
3603
3604 const char* flags_file = Arguments::get_jvm_flags_file();
3605 settings_file_specified = (flags_file != nullptr);
3606
3607 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags.
3608 if (settings_file_specified) {
3609 if (!process_settings_file(flags_file, true,
3610 IgnoreUnrecognizedVMOptions)) {
3611 return JNI_EINVAL;
3612 }
3613 } else {
3614 #ifdef ASSERT
3615 // Parse default .hotspotrc settings file
3616 if (!process_settings_file(".hotspotrc", false,
3617 IgnoreUnrecognizedVMOptions)) {
3618 return JNI_EINVAL;
3619 }
3620 #else
3621 struct stat buf;
3622 if (os::stat(hotspotrc, &buf) == 0) {
3623 needs_hotspotrc_warning = true;
3624 }
3625 #endif
3626 }
3627
3628 // The settings in the args are applied in this order to the the JVM global flags.
3629 // For historical reasons, the order is DIFFERENT than the scanning order of
3630 // the above expand_vm_options_as_needed() calls.
3631 all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE});
3632 all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR});
3633 all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE});
3634 all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR});
3635
3636 // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all
3637 // the options that have been gathered above.
3638 code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args);
3639 if (code != JNI_OK) {
3640 return code;
3641 }
3642 code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(),
3643 &mod_jdk_aot_vm_options_args,
3644 &cur_jdk_aot_vm_options_args);
3645 if (code != JNI_OK) {
3646 return code;
3647 }
3648
3649 for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) {
3650 JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index;
3651 const char* optionString = option->optionString;
3652 if (strstr(optionString, "-XX:AOTMode=") == optionString &&
3653 strcmp(optionString, "-XX:AOTMode=create") != 0) {
3654 jio_fprintf(defaultStream::error_stream(),
3655 "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString);
3656 return JNI_ERR;
3657 }
3658 }
3659
3660 all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR});
3661
3662 if (IgnoreUnrecognizedVMOptions) {
3663 // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of
3664 // the JDK so it shouldn't have bad options.
3665 cur_cmd_args->ignoreUnrecognized = true;
3666 cur_java_tool_options_args->ignoreUnrecognized = true;
3667 cur_java_options_args->ignoreUnrecognized = true;
3668 cur_jdk_aot_vm_options_args->ignoreUnrecognized = true;
3669 }
3670
3671 if (PrintVMOptions) {
3672 // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed.
3673 print_options(cur_java_tool_options_args);
3674 print_options(cur_cmd_args);
3675 print_options(cur_java_options_args);
3676 print_options(cur_jdk_aot_vm_options_args);
3677 }
3678
3679 // Apply the settings in these args to the JVM global flags.
3680 jint result = parse_vm_init_args(&all_args);
3681
3682 if (result != JNI_OK) {
3683 return result;
3684 }
3685
3686 // Delay warning until here so that we've had a chance to process
3687 // the -XX:-PrintWarnings flag
3688 if (needs_hotspotrc_warning) {
3689 warning("%s file is present but has been ignored. "
3690 "Run with -XX:Flags=%s to load the file.",
3691 hotspotrc, hotspotrc);
3692 }
3693
3694 if (needs_module_property_warning) {
3695 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3696 " names that are reserved for internal use.");
3697 }
3698
3699 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3700 UNSUPPORTED_OPTION(UseLargePages);
3701 #endif
3702
3703 #if defined(AIX)
3704 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3705 #endif
3706
3707 #ifndef PRODUCT
3708 if (TraceBytecodesAt != 0) {
3709 TraceBytecodes = true;
3710 }
3711 #endif // PRODUCT
3712
3713 if (ScavengeRootsInCode == 0) {
3714 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3715 warning("Forcing ScavengeRootsInCode non-zero");
3716 }
3717 ScavengeRootsInCode = 1;
3718 }
3719
3720 if (!handle_deprecated_print_gc_flags()) {
3721 return JNI_EINVAL;
3722 }
3723
3724 // Set object alignment values.
3725 set_object_alignment();
3726
3727 #if !INCLUDE_CDS
3728 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3729 jio_fprintf(defaultStream::error_stream(),
3730 "Shared spaces are not supported in this VM\n");
3731 return JNI_ERR;
3732 }
3733 if (DumpLoadedClassList != nullptr) {
3734 jio_fprintf(defaultStream::error_stream(),
3735 "DumpLoadedClassList is not supported in this VM\n");
3736 return JNI_ERR;
3737 }
3738 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3739 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) {
3740 warning("Shared spaces are not supported in this VM");
3741 UseSharedSpaces = false;
3742 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3743 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot));
3744 }
3745 no_shared_spaces("CDS Disabled");
3746 #endif // INCLUDE_CDS
3747
3748 // Verify NMT arguments
3749 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3750 if (lvl == NMT_unknown) {
3751 jio_fprintf(defaultStream::error_stream(),
3752 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3753 return JNI_ERR;
3754 }
3755 if (PrintNMTStatistics && lvl == NMT_off) {
3756 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3757 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3758 }
3759
3760 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3761 if (trace_dependencies && VerifyDependencies) {
3762 warning("dependency logging results may be inflated by VerifyDependencies");
3763 }
3764
3765 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3766 log_is_enabled(Info, class, load, cause);
3767 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3768 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3769 }
3770
3771 apply_debugger_ergo();
3772
3773 // The VMThread needs to stop now and then to execute these debug options.
3774 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3775 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3776 }
3777
3778 if (log_is_enabled(Info, arguments)) {
3779 LogStream st(Log(arguments)::info());
3780 Arguments::print_on(&st);
3781 }
3782
3783 return JNI_OK;
3784 }
3785
3786 void Arguments::set_compact_headers_flags() {
3787 #ifdef _LP64
3788 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3789 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3790 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3791 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3792
3793 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3794 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3795 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3796 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3797 } else {
3798 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3799 }
3800 }
3801 #endif
3802 }
3803
3804 jint Arguments::apply_ergo() {
3805 // Set flags based on ergonomics.
3806 jint result = set_ergonomics_flags();
3807 if (result != JNI_OK) return result;
3808
3809 // Set heap size based on available physical memory
3810 set_heap_size();
3811
3812 GCConfig::arguments()->initialize();
3813
3814 set_compact_headers_flags();
3815
3816 CompressedKlassPointers::pre_initialize();
3817
3818 CDSConfig::ergo_initialize();
3819
3820 // Initialize Metaspace flags and alignments
3821 Metaspace::ergo_initialize();
3822
3823 if (!StringDedup::ergo_initialize()) {
3824 return JNI_EINVAL;
3825 }
3826
3827 // Set compiler flags after GC is selected and GC specific
3828 // flags (LoopStripMiningIter) are set.
3829 CompilerConfig::ergo_initialize();
3830
3831 // Set bytecode rewriting flags
3832 set_bytecode_flags();
3833
3834 // Set flags if aggressive optimization flags are enabled
3835 jint code = set_aggressive_opts_flags();
3836 if (code != JNI_OK) {
3837 return code;
3838 }
3839
3840 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3841 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3842 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3843 warning("UseSecondarySupersTable is not supported");
3844 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3845 }
3846 if (!UseSecondarySupersTable) {
3847 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3848 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3849 }
3850
3851 #ifdef ZERO
3852 // Clear flags not supported on zero.
3853 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3854 #endif // ZERO
3855
3856 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3857 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3858 DebugNonSafepoints = true;
3859 }
3860
3861 // Treat the odd case where local verification is enabled but remote
3862 // verification is not as if both were enabled.
3863 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3864 log_info(verification)("Turning on remote verification because local verification is on");
3865 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3866 }
3867 if (!is_valhalla_enabled()) {
3868 #define WARN_IF_NOT_DEFAULT_FLAG(flag) \
3869 if (!FLAG_IS_DEFAULT(flag)) { \
3870 warning("Preview-specific flag \"%s\" has no effect when --enable-preview is not specified.", #flag); \
3871 }
3872
3873 #define DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(flag) \
3874 WARN_IF_NOT_DEFAULT_FLAG(flag) \
3875 FLAG_SET_DEFAULT(flag, false);
3876
3877 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(InlineTypePassFieldsAsArgs);
3878 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(InlineTypeReturnedAsFields);
3879 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseArrayFlattening);
3880 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseFieldFlattening);
3881 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseNullFreeNonAtomicValueFlattening);
3882 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseNullableAtomicValueFlattening);
3883 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseNullFreeAtomicValueFlattening);
3884 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseNullableNonAtomicValueFlattening);
3885 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(PrintInlineLayout);
3886 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(PrintFlatArrayLayout);
3887 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(IgnoreAssertUnsetFields);
3888 WARN_IF_NOT_DEFAULT_FLAG(FlatArrayElementMaxOops);
3889 WARN_IF_NOT_DEFAULT_FLAG(ForceNonTearable);
3890 #ifdef ASSERT
3891 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(StressCallingConvention);
3892 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(PreloadClasses);
3893 WARN_IF_NOT_DEFAULT_FLAG(PrintInlineKlassFields);
3894 #endif
3895 #ifdef COMPILER1
3896 DEBUG_ONLY(DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(C1UseDelayedFlattenedFieldReads);)
3897 #endif
3898 #ifdef COMPILER2
3899 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseArrayLoadStoreProfile);
3900 DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT(UseACmpProfile);
3901 #endif
3902 #undef DISABLE_FLAG_AND_WARN_IF_NOT_DEFAULT
3903 #undef WARN_IF_NOT_DEFAULT_FLAG
3904 } else {
3905 #define DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING(flag, fallback) \
3906 if (!FLAG_IS_DEFAULT(flag) && !UseArrayFlattening && !UseFieldFlattening) { \
3907 warning("Flattening flag \"%s\" has no effect when all flattening modes are disabled.", #flag); \
3908 FLAG_SET_DEFAULT(flag, fallback); \
3909 }
3910
3911 DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING(UseNullFreeNonAtomicValueFlattening, false);
3912 DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING(UseNullableAtomicValueFlattening, false);
3913 DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING(UseNullFreeAtomicValueFlattening, false);
3914 DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING(UseNullableNonAtomicValueFlattening, false);
3915 DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING(FlatArrayElementMaxOops, 0);
3916 #undef DISABLE_FLAG_AND_WARN_IF_NO_FLATTENING
3917 if (is_interpreter_only() && !CDSConfig::is_dumping_archive() && !UseSharedSpaces) {
3918 // Disable calling convention optimizations if inline types are not supported.
3919 // Also these aren't useful in -Xint. However, don't disable them when dumping or using
3920 // the CDS archive, as the values must match between dumptime and runtime.
3921 FLAG_SET_DEFAULT(InlineTypePassFieldsAsArgs, false);
3922 FLAG_SET_DEFAULT(InlineTypeReturnedAsFields, false);
3923 }
3924 if (!UseNullFreeNonAtomicValueFlattening &&
3925 !UseNullableAtomicValueFlattening &&
3926 !UseNullFreeAtomicValueFlattening &&
3927 !UseNullableNonAtomicValueFlattening) {
3928 // Flattening is disabled
3929 FLAG_SET_DEFAULT(UseArrayFlattening, false);
3930 FLAG_SET_DEFAULT(UseFieldFlattening, false);
3931 }
3932 }
3933
3934 #ifndef PRODUCT
3935 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3936 if (use_vm_log()) {
3937 LogVMOutput = true;
3938 }
3939 }
3940 #endif // PRODUCT
3941
3942 if (PrintCommandLineFlags) {
3943 JVMFlag::printSetFlags(tty);
3944 }
3945
3946 #if COMPILER2_OR_JVMCI
3947 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3948 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3949 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3950 }
3951 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3952
3953 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3954 if (!EnableVectorReboxing) {
3955 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3956 } else {
3957 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3958 }
3959 }
3960 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3961 }
3962 #endif // COMPILER2_OR_JVMCI
3963
3964 #ifdef COMPILER2
3965 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
3966 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
3967 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
3968 }
3969 #endif // COMPILER2
3970
3971 if (log_is_enabled(Info, perf, class, link)) {
3972 if (!UsePerfData) {
3973 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3974 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
3975 assert(!log_is_enabled(Info, perf, class, link), "sanity");
3976 }
3977 }
3978
3979 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3980 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3981 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3982 }
3983 }
3984 return JNI_OK;
3985 }
3986
3987 jint Arguments::adjust_after_os() {
3988 if (UseNUMA) {
3989 if (UseParallelGC) {
3990 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3991 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3992 }
3993 }
3994 }
3995 return JNI_OK;
3996 }
3997
3998 int Arguments::PropertyList_count(SystemProperty* pl) {
3999 int count = 0;
4000 while(pl != nullptr) {
4001 count++;
4002 pl = pl->next();
4003 }
4004 return count;
4005 }
4006
4007 // Return the number of readable properties.
4008 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4009 int count = 0;
4010 while(pl != nullptr) {
4011 if (pl->readable()) {
4012 count++;
4013 }
4014 pl = pl->next();
4015 }
4016 return count;
4017 }
4018
4019 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4020 assert(key != nullptr, "just checking");
4021 SystemProperty* prop;
4022 for (prop = pl; prop != nullptr; prop = prop->next()) {
4023 if (strcmp(key, prop->key()) == 0) return prop->value();
4024 }
4025 return nullptr;
4026 }
4027
4028 // Return the value of the requested property provided that it is a readable property.
4029 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4030 assert(key != nullptr, "just checking");
4031 SystemProperty* prop;
4032 // Return the property value if the keys match and the property is not internal or
4033 // it's the special internal property "jdk.boot.class.path.append".
4034 for (prop = pl; prop != nullptr; prop = prop->next()) {
4035 if (strcmp(key, prop->key()) == 0) {
4036 if (!prop->internal()) {
4037 return prop->value();
4038 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4039 return prop->value();
4040 } else {
4041 // Property is internal and not jdk.boot.class.path.append so return null.
4042 return nullptr;
4043 }
4044 }
4045 }
4046 return nullptr;
4047 }
4048
4049 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4050 SystemProperty* p = *plist;
4051 if (p == nullptr) {
4052 *plist = new_p;
4053 } else {
4054 while (p->next() != nullptr) {
4055 p = p->next();
4056 }
4057 p->set_next(new_p);
4058 }
4059 }
4060
4061 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4062 bool writeable, bool internal) {
4063 if (plist == nullptr)
4064 return;
4065
4066 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4067 PropertyList_add(plist, new_p);
4068 }
4069
4070 void Arguments::PropertyList_add(SystemProperty *element) {
4071 PropertyList_add(&_system_properties, element);
4072 }
4073
4074 // This add maintains unique property key in the list.
4075 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4076 PropertyAppendable append, PropertyWriteable writeable,
4077 PropertyInternal internal) {
4078 if (plist == nullptr)
4079 return;
4080
4081 // If property key exists and is writeable, then update with new value.
4082 // Trying to update a non-writeable property is silently ignored.
4083 SystemProperty* prop;
4084 for (prop = *plist; prop != nullptr; prop = prop->next()) {
4085 if (strcmp(k, prop->key()) == 0) {
4086 if (append == AppendProperty) {
4087 prop->append_writeable_value(v);
4088 } else {
4089 prop->set_writeable_value(v);
4090 }
4091 return;
4092 }
4093 }
4094
4095 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4096 }
4097
4098 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4099 // Returns true if all of the source pointed by src has been copied over to
4100 // the destination buffer pointed by buf. Otherwise, returns false.
4101 // Notes:
4102 // 1. If the length (buflen) of the destination buffer excluding the
4103 // null terminator character is not long enough for holding the expanded
4104 // pid characters, it also returns false instead of returning the partially
4105 // expanded one.
4106 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4107 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4108 char* buf, size_t buflen) {
4109 const char* p = src;
4110 char* b = buf;
4111 const char* src_end = &src[srclen];
4112 char* buf_end = &buf[buflen - 1];
4113
4114 while (p < src_end && b < buf_end) {
4115 if (*p == '%') {
4116 switch (*(++p)) {
4117 case '%': // "%%" ==> "%"
4118 *b++ = *p++;
4119 break;
4120 case 'p': { // "%p" ==> current process id
4121 // buf_end points to the character before the last character so
4122 // that we could write '\0' to the end of the buffer.
4123 size_t buf_sz = buf_end - b + 1;
4124 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4125
4126 // if jio_snprintf fails or the buffer is not long enough to hold
4127 // the expanded pid, returns false.
4128 if (ret < 0 || ret >= (int)buf_sz) {
4129 return false;
4130 } else {
4131 b += ret;
4132 assert(*b == '\0', "fail in copy_expand_pid");
4133 if (p == src_end && b == buf_end + 1) {
4134 // reach the end of the buffer.
4135 return true;
4136 }
4137 }
4138 p++;
4139 break;
4140 }
4141 default :
4142 *b++ = '%';
4143 }
4144 } else {
4145 *b++ = *p++;
4146 }
4147 }
4148 *b = '\0';
4149 return (p == src_end); // return false if not all of the source was copied
4150 }