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