1 /*
2 * Copyright (c) 1997, 2025, 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 "gc/shared/gcArguments.hpp"
35 #include "gc/shared/gcConfig.hpp"
36 #include "gc/shared/genArguments.hpp"
37 #include "gc/shared/stringdedup/stringDedup.hpp"
38 #include "gc/shared/tlab_globals.hpp"
39 #include "jvm.h"
40 #include "logging/log.hpp"
41 #include "logging/logConfiguration.hpp"
42 #include "logging/logStream.hpp"
43 #include "logging/logTag.hpp"
44 #include "memory/allocation.inline.hpp"
45 #include "nmt/nmtCommon.hpp"
46 #include "oops/compressedKlass.hpp"
47 #include "oops/instanceKlass.hpp"
48 #include "oops/objLayout.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "prims/jvmtiAgentList.hpp"
51 #include "prims/jvmtiExport.hpp"
52 #include "runtime/arguments.hpp"
53 #include "runtime/flags/jvmFlag.hpp"
54 #include "runtime/flags/jvmFlagAccess.hpp"
55 #include "runtime/flags/jvmFlagLimit.hpp"
56 #include "runtime/globals_extension.hpp"
57 #include "runtime/java.hpp"
58 #include "runtime/os.hpp"
59 #include "runtime/safepoint.hpp"
60 #include "runtime/safepointMechanism.hpp"
61 #include "runtime/synchronizer.hpp"
62 #include "runtime/vm_version.hpp"
63 #include "services/management.hpp"
64 #include "utilities/align.hpp"
65 #include "utilities/checkedCast.hpp"
66 #include "utilities/debug.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/macros.hpp"
69 #include "utilities/parseInteger.hpp"
70 #include "utilities/powerOfTwo.hpp"
71 #include "utilities/stringUtils.hpp"
72 #include "utilities/systemMemoryBarrier.hpp"
73 #if INCLUDE_JFR
74 #include "jfr/jfr.hpp"
75 #endif
76
77 #include <limits>
78
79 static const char _default_java_launcher[] = "generic";
80
81 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
82
83 char* Arguments::_jvm_flags_file = nullptr;
84 char** Arguments::_jvm_flags_array = nullptr;
85 int Arguments::_num_jvm_flags = 0;
86 char** Arguments::_jvm_args_array = nullptr;
87 int Arguments::_num_jvm_args = 0;
88 unsigned int Arguments::_addmods_count = 0;
89 #if INCLUDE_JVMCI
90 bool Arguments::_jvmci_module_added = false;
91 #endif
92 char* Arguments::_java_command = nullptr;
93 SystemProperty* Arguments::_system_properties = nullptr;
94 size_t Arguments::_conservative_max_heap_alignment = 0;
95 Arguments::Mode Arguments::_mode = _mixed;
96 const char* Arguments::_java_vendor_url_bug = nullptr;
97 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
98 bool Arguments::_executing_unit_tests = false;
99
100 // These parameters are reset in method parse_vm_init_args()
101 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
102 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
103 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
104 bool Arguments::_ClipInlining = ClipInlining;
105 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
106
107 bool Arguments::_enable_preview = false;
108 bool Arguments::_has_jdwp_agent = false;
109
110 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
111
112 // These are not set by the JDK's built-in launchers, but they can be set by
113 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
114 // JavaVMOption in jni.h.
115 abort_hook_t Arguments::_abort_hook = nullptr;
116 exit_hook_t Arguments::_exit_hook = nullptr;
117 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
118
119
120 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
121 SystemProperty *Arguments::_java_library_path = nullptr;
122 SystemProperty *Arguments::_java_home = nullptr;
123 SystemProperty *Arguments::_java_class_path = nullptr;
124 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
125 SystemProperty *Arguments::_vm_info = nullptr;
126
127 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
128 PathString *Arguments::_boot_class_path = nullptr;
129 bool Arguments::_has_jimage = false;
130
131 char* Arguments::_ext_dirs = nullptr;
132
133 // True if -Xshare:auto option was specified.
134 static bool xshare_auto_cmd_line = false;
135
136 // True if -Xint/-Xmixed/-Xcomp were specified
137 static bool mode_flag_cmd_line = false;
138
139 struct VMInitArgsGroup {
140 const JavaVMInitArgs* _args;
141 JVMFlagOrigin _origin;
142 };
143
144 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
145 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
146 if (new_value == nullptr) {
147 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
148 return false;
149 }
150 if (_value != nullptr) {
151 FreeHeap(_value);
152 }
153 _value = new_value;
154 strcpy(_value, value);
155 return true;
156 }
157
158 void PathString::append_value(const char *value) {
159 char *sp;
160 size_t len = 0;
161 if (value != nullptr) {
162 len = strlen(value);
163 if (_value != nullptr) {
164 len += strlen(_value);
165 }
166 sp = AllocateHeap(len+2, mtArguments);
167 assert(sp != nullptr, "Unable to allocate space for new append path value");
168 if (sp != nullptr) {
169 if (_value != nullptr) {
170 strcpy(sp, _value);
171 strcat(sp, os::path_separator());
172 strcat(sp, value);
173 FreeHeap(_value);
174 } else {
175 strcpy(sp, value);
176 }
177 _value = sp;
178 }
179 }
180 }
181
182 PathString::PathString(const char* value) {
183 if (value == nullptr) {
184 _value = nullptr;
185 } else {
186 _value = AllocateHeap(strlen(value)+1, mtArguments);
187 strcpy(_value, value);
188 }
189 }
190
191 PathString::~PathString() {
192 if (_value != nullptr) {
193 FreeHeap(_value);
194 _value = nullptr;
195 }
196 }
197
198 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
199 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
200 size_t len = strlen(module_name) + 1;
201 _module_name = AllocateHeap(len, mtInternal);
202 strncpy(_module_name, module_name, len); // copy the trailing null
203 _path = new PathString(path);
204 }
205
206 ModulePatchPath::~ModulePatchPath() {
207 if (_module_name != nullptr) {
208 FreeHeap(_module_name);
209 _module_name = nullptr;
210 }
211 if (_path != nullptr) {
212 delete _path;
213 _path = nullptr;
214 }
215 }
216
217 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
218 if (key == nullptr) {
219 _key = nullptr;
220 } else {
221 _key = AllocateHeap(strlen(key)+1, mtArguments);
222 strcpy(_key, key);
223 }
224 _next = nullptr;
225 _internal = internal;
226 _writeable = writeable;
227 }
228
229 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
230 // part of the option string.
231 static bool match_option(const JavaVMOption *option, const char* name,
232 const char** tail) {
233 size_t len = strlen(name);
234 if (strncmp(option->optionString, name, len) == 0) {
235 *tail = option->optionString + len;
236 return true;
237 } else {
238 return false;
239 }
240 }
241
242 // Check if 'option' matches 'name'. No "tail" is allowed.
243 static bool match_option(const JavaVMOption *option, const char* name) {
244 const char* tail = nullptr;
245 bool result = match_option(option, name, &tail);
246 if (tail != nullptr && *tail == '\0') {
247 return result;
248 } else {
249 return false;
250 }
251 }
252
253 // Return true if any of the strings in null-terminated array 'names' matches.
254 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
255 // the option must match exactly.
256 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
257 bool tail_allowed) {
258 for (/* empty */; *names != nullptr; ++names) {
259 if (match_option(option, *names, tail)) {
260 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
261 return true;
262 }
263 }
264 }
265 return false;
266 }
267
268 #if INCLUDE_JFR
269 static bool _has_jfr_option = false; // is using JFR
270
271 // return true on failure
272 static bool match_jfr_option(const JavaVMOption** option) {
273 assert((*option)->optionString != nullptr, "invariant");
274 char* tail = nullptr;
275 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
276 _has_jfr_option = true;
277 return Jfr::on_start_flight_recording_option(option, tail);
278 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
279 _has_jfr_option = true;
280 return Jfr::on_flight_recorder_option(option, tail);
281 }
282 return false;
283 }
284
285 bool Arguments::has_jfr_option() {
286 return _has_jfr_option;
287 }
288 #endif
289
290 static void logOption(const char* opt) {
291 if (PrintVMOptions) {
292 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
293 }
294 }
295
296 bool needs_module_property_warning = false;
297
298 #define MODULE_PROPERTY_PREFIX "jdk.module."
299 #define MODULE_PROPERTY_PREFIX_LEN 11
300 #define ADDEXPORTS "addexports"
301 #define ADDEXPORTS_LEN 10
302 #define ADDREADS "addreads"
303 #define ADDREADS_LEN 8
304 #define ADDOPENS "addopens"
305 #define ADDOPENS_LEN 8
306 #define PATCH "patch"
307 #define PATCH_LEN 5
308 #define ADDMODS "addmods"
309 #define ADDMODS_LEN 7
310 #define LIMITMODS "limitmods"
311 #define LIMITMODS_LEN 9
312 #define PATH "path"
313 #define PATH_LEN 4
314 #define UPGRADE_PATH "upgrade.path"
315 #define UPGRADE_PATH_LEN 12
316 #define ENABLE_NATIVE_ACCESS "enable.native.access"
317 #define ENABLE_NATIVE_ACCESS_LEN 20
318 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
319 #define ILLEGAL_NATIVE_ACCESS_LEN 21
320
321 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
322 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
323 return ((strncmp(option, property, len) == 0) &&
324 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
325 }
326
327 // Return true if property starts with "jdk.module." and its ensuing chars match
328 // any of the reserved module properties.
329 // property should be passed without the leading "-D".
330 bool Arguments::is_internal_module_property(const char* property) {
331 return internal_module_property_helper(property, false);
332 }
333
334 // Returns true if property is one of those recognized by is_internal_module_property() but
335 // is not supported by CDS archived full module graph.
336 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
337 return internal_module_property_helper(property, true);
338 }
339
340 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
341 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
342 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
343 if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
344 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
345 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
346 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN)) {
347 return true;
348 }
349
350 if (!check_for_cds) {
351 // CDS notes: these properties are supported by CDS archived full module graph.
352 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
353 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
354 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
355 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
356 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
357 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
358 return true;
359 }
360 }
361 }
362 return false;
363 }
364
365 // Process java launcher properties.
366 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
367 // See if sun.java.launcher is defined.
368 // Must do this before setting up other system properties,
369 // as some of them may depend on launcher type.
370 for (int index = 0; index < args->nOptions; index++) {
371 const JavaVMOption* option = args->options + index;
372 const char* tail;
373
374 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
375 process_java_launcher_argument(tail, option->extraInfo);
376 continue;
377 }
378 if (match_option(option, "-XX:+ExecutingUnitTests")) {
379 _executing_unit_tests = true;
380 continue;
381 }
382 }
383 }
384
385 // Initialize system properties key and value.
386 void Arguments::init_system_properties() {
387
388 // Set up _boot_class_path which is not a property but
389 // relies heavily on argument processing and the jdk.boot.class.path.append
390 // property. It is used to store the underlying boot class path.
391 _boot_class_path = new PathString(nullptr);
392
393 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
394 "Java Virtual Machine Specification", false));
395 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
396 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
397 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
398
399 // Initialize the vm.info now, but it will need updating after argument parsing.
400 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
401
402 // Following are JVMTI agent writable properties.
403 // Properties values are set to nullptr and they are
404 // os specific they are initialized in os::init_system_properties_values().
405 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
406 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
407 _java_home = new SystemProperty("java.home", nullptr, true);
408 _java_class_path = new SystemProperty("java.class.path", "", true);
409 // jdk.boot.class.path.append is a non-writeable, internal property.
410 // It can only be set by either:
411 // - -Xbootclasspath/a:
412 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
413 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
414
415 // Add to System Property list.
416 PropertyList_add(&_system_properties, _sun_boot_library_path);
417 PropertyList_add(&_system_properties, _java_library_path);
418 PropertyList_add(&_system_properties, _java_home);
419 PropertyList_add(&_system_properties, _java_class_path);
420 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
421 PropertyList_add(&_system_properties, _vm_info);
422
423 // Set OS specific system properties values
424 os::init_system_properties_values();
425 }
426
427 // Update/Initialize System properties after JDK version number is known
428 void Arguments::init_version_specific_system_properties() {
429 enum { bufsz = 16 };
430 char buffer[bufsz];
431 const char* spec_vendor = "Oracle Corporation";
432 uint32_t spec_version = JDK_Version::current().major_version();
433
434 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
435
436 PropertyList_add(&_system_properties,
437 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
438 PropertyList_add(&_system_properties,
439 new SystemProperty("java.vm.specification.version", buffer, false));
440 PropertyList_add(&_system_properties,
441 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
442 }
443
444 /*
445 * -XX argument processing:
446 *
447 * -XX arguments are defined in several places, such as:
448 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
449 * -XX arguments are parsed in parse_argument().
450 * -XX argument bounds checking is done in check_vm_args_consistency().
451 *
452 * Over time -XX arguments may change. There are mechanisms to handle common cases:
453 *
454 * ALIASED: An option that is simply another name for another option. This is often
455 * part of the process of deprecating a flag, but not all aliases need
456 * to be deprecated.
457 *
458 * Create an alias for an option by adding the old and new option names to the
459 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
460 *
461 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
462 * support may be removed in the future. Both regular and aliased options may be
463 * deprecated.
464 *
465 * Add a deprecation warning for an option (or alias) by adding an entry in the
466 * "special_jvm_flags" table and setting the "deprecated_in" field.
467 * Often an option "deprecated" in one major release will
468 * be made "obsolete" in the next. In this case the entry should also have its
469 * "obsolete_in" field set.
470 *
471 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
472 * on the command line. A warning is printed to let the user know that option might not
473 * be accepted in the future.
474 *
475 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
476 * table and setting the "obsolete_in" field.
477 *
478 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
479 * to the current JDK version. The system will flatly refuse to admit the existence of
480 * the flag. This allows a flag to die automatically over JDK releases.
481 *
482 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
483 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
484 * - Newly obsolete or expired deprecated options should have their global variable
485 * definitions removed (from globals.hpp, etc) and related implementations removed.
486 *
487 * Recommended approach for removing options:
488 *
489 * To remove options commonly used by customers (e.g. product -XX options), use
490 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
491 *
492 * To remove internal options (e.g. diagnostic, experimental, develop options), use
493 * a 2-step model adding major release numbers to the obsolete and expire columns.
494 *
495 * To change the name of an option, use the alias table as well as a 2-step
496 * model adding major release numbers to the deprecate and expire columns.
497 * Think twice about aliasing commonly used customer options.
498 *
499 * There are times when it is appropriate to leave a future release number as undefined.
500 *
501 * Tests: Aliases should be tested in VMAliasOptions.java.
502 * Deprecated options should be tested in VMDeprecatedOptions.java.
503 */
504
505 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
506 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
507 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
508 // the command-line as usual, but will issue a warning.
509 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
510 // the command-line, while issuing a warning and ignoring the flag value.
511 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
512 // existence of the flag.
513 //
514 // MANUAL CLEANUP ON JDK VERSION UPDATES:
515 // This table ensures that the handling of options will update automatically when the JDK
516 // version is incremented, but the source code needs to be cleanup up manually:
517 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
518 // variable should be removed, as well as users of the variable.
519 // - As "deprecated" options age into "obsolete" options, move the entry into the
520 // "Obsolete Flags" section of the table.
521 // - All expired options should be removed from the table.
522 static SpecialFlag const special_jvm_flags[] = {
523 // -------------- Deprecated Flags --------------
524 // --- Non-alias flags - sorted by obsolete_in then expired_in:
525 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
526 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
527 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
528 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
529 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
530 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
531 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
532 #ifdef _LP64
533 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::undefined() },
534 #endif
535 { "ParallelRefProcEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
536 { "ParallelRefProcBalancingEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
537 { "PSChunkLargeArrays", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
538 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
539 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
540
541 // -------------- Obsolete Flags - sorted by expired_in --------------
542
543 #ifdef LINUX
544 { "UseOprofile", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) },
545 #endif
546 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
547 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::undefined() },
548 { "ZMarkStackSpaceLimit", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
549 #if defined(AARCH64)
550 { "NearCpool", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
551 #endif
552
553 { "AdaptiveSizeMajorGCDecayTimeScale", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
554 { "AdaptiveSizePolicyInitializingSteps", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
555 { "AdaptiveSizePolicyOutputInterval", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
556 { "AdaptiveSizeThroughPutPolicy", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
557 { "AdaptiveTimeWeight", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
558 { "PausePadding", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
559 { "SurvivorPadding", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
560 { "TenuredGenerationSizeIncrement", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
561 { "TenuredGenerationSizeSupplement", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
562 { "TenuredGenerationSizeSupplementDecay", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
563 { "UseAdaptiveGenerationSizePolicyAtMajorCollection", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
564 { "UseAdaptiveGenerationSizePolicyAtMinorCollection", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
565 { "UseAdaptiveSizeDecayMajorGCCost", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
566 { "UseAdaptiveSizePolicyFootprintGoal", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
567 { "UseAdaptiveSizePolicyWithSystemGC", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
568 { "UsePSAdaptiveSurvivorSizePolicy", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
569
570 #ifdef ASSERT
571 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
572 #endif
573
574 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
575 // These entries will generate build errors. Their purpose is to test the macros.
576 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
577 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
578 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
579 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
580 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
581 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
582 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
583 #endif
584
585 { nullptr, JDK_Version(0), JDK_Version(0) }
586 };
587
588 // Flags that are aliases for other flags.
589 typedef struct {
590 const char* alias_name;
591 const char* real_name;
592 } AliasedFlag;
593
594 static AliasedFlag const aliased_jvm_flags[] = {
595 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
596 { nullptr, nullptr}
597 };
598
599 // Return true if "v" is less than "other", where "other" may be "undefined".
600 static bool version_less_than(JDK_Version v, JDK_Version other) {
601 assert(!v.is_undefined(), "must be defined");
602 if (!other.is_undefined() && v.compare(other) >= 0) {
603 return false;
604 } else {
605 return true;
606 }
607 }
608
609 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
610 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
611 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
612 flag = special_jvm_flags[i];
613 return true;
614 }
615 }
616 return false;
617 }
618
619 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
620 assert(version != nullptr, "Must provide a version buffer");
621 SpecialFlag flag;
622 if (lookup_special_flag(flag_name, flag)) {
623 if (!flag.obsolete_in.is_undefined()) {
624 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
625 *version = flag.obsolete_in;
626 // This flag may have been marked for obsoletion in this version, but we may not
627 // have actually removed it yet. Rather than ignoring it as soon as we reach
628 // this version we allow some time for the removal to happen. So if the flag
629 // still actually exists we process it as normal, but issue an adjusted warning.
630 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
631 if (real_flag != nullptr) {
632 char version_str[256];
633 version->to_string(version_str, sizeof(version_str));
634 warning("Temporarily processing option %s; support is scheduled for removal in %s",
635 flag_name, version_str);
636 return false;
637 }
638 return true;
639 }
640 }
641 }
642 return false;
643 }
644
645 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
646 assert(version != nullptr, "Must provide a version buffer");
647 SpecialFlag flag;
648 if (lookup_special_flag(flag_name, flag)) {
649 if (!flag.deprecated_in.is_undefined()) {
650 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
651 version_less_than(JDK_Version::current(), flag.expired_in)) {
652 *version = flag.deprecated_in;
653 return 1;
654 } else {
655 return -1;
656 }
657 }
658 }
659 return 0;
660 }
661
662 const char* Arguments::real_flag_name(const char *flag_name) {
663 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
664 const AliasedFlag& flag_status = aliased_jvm_flags[i];
665 if (strcmp(flag_status.alias_name, flag_name) == 0) {
666 return flag_status.real_name;
667 }
668 }
669 return flag_name;
670 }
671
672 #ifdef ASSERT
673 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
674 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
675 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
676 return true;
677 }
678 }
679 return false;
680 }
681
682 // Verifies the correctness of the entries in the special_jvm_flags table.
683 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
684 // version being earlier than the deprecation version, then a warning is issued
685 // and verification fails - by returning false. If it is detected that the table
686 // is out of date, with respect to the current version, then ideally a warning is
687 // issued but verification does not fail. This allows the VM to operate when the
688 // version is first updated, without needing to update all the impacted flags at
689 // the same time. In practice we can't issue the warning immediately when the version
690 // is updated as it occurs for every test and some tests are not prepared to handle
691 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
692 // if the check_globals flag is true, and in addition allow a grace period and only
693 // check for stale flags when we hit build 25 (which is far enough into the 6 month
694 // release cycle that all flag updates should have been processed, whilst still
695 // leaving time to make the change before RDP2).
696 // We use a gtest to call this, passing true, so that we can detect stale flags before
697 // the end of the release cycle.
698
699 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
700
701 bool Arguments::verify_special_jvm_flags(bool check_globals) {
702 bool success = true;
703 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
704 const SpecialFlag& flag = special_jvm_flags[i];
705 if (lookup_special_flag(flag.name, i)) {
706 warning("Duplicate special flag declaration \"%s\"", flag.name);
707 success = false;
708 }
709 if (flag.deprecated_in.is_undefined() &&
710 flag.obsolete_in.is_undefined()) {
711 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
712 success = false;
713 }
714
715 if (!flag.deprecated_in.is_undefined()) {
716 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
717 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
718 success = false;
719 }
720
721 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
722 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
723 success = false;
724 }
725 }
726
727 if (!flag.obsolete_in.is_undefined()) {
728 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
729 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
730 success = false;
731 }
732
733 // if flag has become obsolete it should not have a "globals" flag defined anymore.
734 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
735 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
736 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
737 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
738 success = false;
739 }
740 }
741
742 } else if (!flag.expired_in.is_undefined()) {
743 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
744 success = false;
745 }
746
747 if (!flag.expired_in.is_undefined()) {
748 // if flag has become expired it should not have a "globals" flag defined anymore.
749 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
750 !version_less_than(JDK_Version::current(), flag.expired_in)) {
751 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
752 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
753 success = false;
754 }
755 }
756 }
757 }
758 return success;
759 }
760 #endif
761
762 bool Arguments::atojulong(const char *s, julong* result) {
763 return parse_integer(s, result);
764 }
765
766 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
767 if (size < min_size) return arg_too_small;
768 if (size > max_size) return arg_too_big;
769 return arg_in_range;
770 }
771
772 // Describe an argument out of range error
773 void Arguments::describe_range_error(ArgsRange errcode) {
774 switch(errcode) {
775 case arg_too_big:
776 jio_fprintf(defaultStream::error_stream(),
777 "The specified size exceeds the maximum "
778 "representable size.\n");
779 break;
780 case arg_too_small:
781 case arg_unreadable:
782 case arg_in_range:
783 // do nothing for now
784 break;
785 default:
786 ShouldNotReachHere();
787 }
788 }
789
790 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
791 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
792 return true;
793 } else {
794 return false;
795 }
796 }
797
798 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
799 // strtod allows leading whitespace, but our flag format does not.
800 if (*value == '\0' || isspace((unsigned char) *value)) {
801 return false;
802 }
803 char* end;
804 errno = 0;
805 double v = strtod(value, &end);
806 if ((errno != 0) || (*end != 0)) {
807 return false;
808 }
809 if (g_isnan(v) || !g_isfinite(v)) {
810 // Currently we cannot handle these special values.
811 return false;
812 }
813
814 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
815 return true;
816 }
817 return false;
818 }
819
820 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
821 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
822
823 if (flag->is_int()) {
824 int v;
825 if (parse_integer(value, &v)) {
826 result = JVMFlagAccess::set_int(flag, &v, origin);
827 }
828 } else if (flag->is_uint()) {
829 uint v;
830 if (parse_integer(value, &v)) {
831 result = JVMFlagAccess::set_uint(flag, &v, origin);
832 }
833 } else if (flag->is_intx()) {
834 intx v;
835 if (parse_integer(value, &v)) {
836 result = JVMFlagAccess::set_intx(flag, &v, origin);
837 }
838 } else if (flag->is_uintx()) {
839 uintx v;
840 if (parse_integer(value, &v)) {
841 result = JVMFlagAccess::set_uintx(flag, &v, origin);
842 }
843 } else if (flag->is_uint64_t()) {
844 uint64_t v;
845 if (parse_integer(value, &v)) {
846 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
847 }
848 } else if (flag->is_size_t()) {
849 size_t v;
850 if (parse_integer(value, &v)) {
851 result = JVMFlagAccess::set_size_t(flag, &v, origin);
852 }
853 }
854
855 return result == JVMFlag::SUCCESS;
856 }
857
858 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
859 if (value[0] == '\0') {
860 value = nullptr;
861 }
862 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
863 // Contract: JVMFlag always returns a pointer that needs freeing.
864 FREE_C_HEAP_ARRAY(char, value);
865 return true;
866 }
867
868 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
869 const char* old_value = "";
870 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
871 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
872 size_t new_len = strlen(new_value);
873 const char* value;
874 char* free_this_too = nullptr;
875 if (old_len == 0) {
876 value = new_value;
877 } else if (new_len == 0) {
878 value = old_value;
879 } else {
880 size_t length = old_len + 1 + new_len + 1;
881 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
882 // each new setting adds another LINE to the switch:
883 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
884 value = buf;
885 free_this_too = buf;
886 }
887 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
888 // JVMFlag always returns a pointer that needs freeing.
889 FREE_C_HEAP_ARRAY(char, value);
890 // JVMFlag made its own copy, so I must delete my own temp. buffer.
891 FREE_C_HEAP_ARRAY(char, free_this_too);
892 return true;
893 }
894
895 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
896 const char* real_name = real_flag_name(arg);
897 JDK_Version since = JDK_Version();
898 switch (is_deprecated_flag(arg, &since)) {
899 case -1: {
900 // Obsolete or expired, so don't process normally,
901 // but allow for an obsolete flag we're still
902 // temporarily allowing.
903 if (!is_obsolete_flag(arg, &since)) {
904 return real_name;
905 }
906 // Note if we're not considered obsolete then we can't be expired either
907 // as obsoletion must come first.
908 return nullptr;
909 }
910 case 0:
911 return real_name;
912 case 1: {
913 char version[256];
914 since.to_string(version, sizeof(version));
915 if (real_name != arg) {
916 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
917 arg, version, real_name);
918 } else {
919 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
920 arg, version);
921 }
922 return real_name;
923 }
924 }
925 ShouldNotReachHere();
926 return nullptr;
927 }
928
929 #define BUFLEN 255
930
931 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
932 char name_copied[BUFLEN+1];
933 if (name[name_length] != 0) {
934 if (name_length > BUFLEN) {
935 return nullptr;
936 } else {
937 strncpy(name_copied, name, name_length);
938 name_copied[name_length] = '\0';
939 name = name_copied;
940 }
941 }
942
943 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
944 if (real_name == nullptr) {
945 return nullptr;
946 }
947 JVMFlag* flag = JVMFlag::find_flag(real_name);
948 return flag;
949 }
950
951 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
952 bool is_bool = false;
953 bool bool_val = false;
954 char c = *arg;
955 if (c == '+' || c == '-') {
956 is_bool = true;
957 bool_val = (c == '+');
958 arg++;
959 }
960
961 const char* name = arg;
962 while (true) {
963 c = *arg;
964 if (isalnum(c) || (c == '_')) {
965 ++arg;
966 } else {
967 break;
968 }
969 }
970
971 size_t name_len = size_t(arg - name);
972 if (name_len == 0) {
973 return false;
974 }
975
976 JVMFlag* flag = find_jvm_flag(name, name_len);
977 if (flag == nullptr) {
978 return false;
979 }
980
981 if (is_bool) {
982 if (*arg != 0) {
983 // Error -- extra characters such as -XX:+BoolFlag=123
984 return false;
985 }
986 return set_bool_flag(flag, bool_val, origin);
987 }
988
989 if (arg[0] == '=') {
990 const char* value = arg + 1;
991 if (flag->is_ccstr()) {
992 if (flag->ccstr_accumulates()) {
993 return append_to_string_flag(flag, value, origin);
994 } else {
995 return set_string_flag(flag, value, origin);
996 }
997 } else if (flag->is_double()) {
998 return set_fp_numeric_flag(flag, value, origin);
999 } else {
1000 return set_numeric_flag(flag, value, origin);
1001 }
1002 }
1003
1004 if (arg[0] == ':' && arg[1] == '=') {
1005 // -XX:Foo:=xxx will reset the string flag to the given value.
1006 const char* value = arg + 2;
1007 return set_string_flag(flag, value, origin);
1008 }
1009
1010 return false;
1011 }
1012
1013 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1014 assert(bldarray != nullptr, "illegal argument");
1015
1016 if (arg == nullptr) {
1017 return;
1018 }
1019
1020 int new_count = *count + 1;
1021
1022 // expand the array and add arg to the last element
1023 if (*bldarray == nullptr) {
1024 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1025 } else {
1026 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1027 }
1028 (*bldarray)[*count] = os::strdup_check_oom(arg);
1029 *count = new_count;
1030 }
1031
1032 void Arguments::build_jvm_args(const char* arg) {
1033 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1034 }
1035
1036 void Arguments::build_jvm_flags(const char* arg) {
1037 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1038 }
1039
1040 // utility function to return a string that concatenates all
1041 // strings in a given char** array
1042 const char* Arguments::build_resource_string(char** args, int count) {
1043 if (args == nullptr || count == 0) {
1044 return nullptr;
1045 }
1046 size_t length = 0;
1047 for (int i = 0; i < count; i++) {
1048 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1049 }
1050 char* s = NEW_RESOURCE_ARRAY(char, length);
1051 char* dst = s;
1052 for (int j = 0; j < count; j++) {
1053 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1054 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1055 dst += offset;
1056 length -= offset;
1057 }
1058 return (const char*) s;
1059 }
1060
1061 void Arguments::print_on(outputStream* st) {
1062 st->print_cr("VM Arguments:");
1063 if (num_jvm_flags() > 0) {
1064 st->print("jvm_flags: "); print_jvm_flags_on(st);
1065 st->cr();
1066 }
1067 if (num_jvm_args() > 0) {
1068 st->print("jvm_args: "); print_jvm_args_on(st);
1069 st->cr();
1070 }
1071 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1072 if (_java_class_path != nullptr) {
1073 char* path = _java_class_path->value();
1074 size_t len = strlen(path);
1075 st->print("java_class_path (initial): ");
1076 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1077 if (len == 0) {
1078 st->print_raw_cr("<not set>");
1079 } else {
1080 st->print_raw_cr(path, len);
1081 }
1082 }
1083 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1084 }
1085
1086 void Arguments::print_summary_on(outputStream* st) {
1087 // Print the command line. Environment variables that are helpful for
1088 // reproducing the problem are written later in the hs_err file.
1089 // flags are from setting file
1090 if (num_jvm_flags() > 0) {
1091 st->print_raw("Settings File: ");
1092 print_jvm_flags_on(st);
1093 st->cr();
1094 }
1095 // args are the command line and environment variable arguments.
1096 st->print_raw("Command Line: ");
1097 if (num_jvm_args() > 0) {
1098 print_jvm_args_on(st);
1099 }
1100 // this is the classfile and any arguments to the java program
1101 if (java_command() != nullptr) {
1102 st->print("%s", java_command());
1103 }
1104 st->cr();
1105 }
1106
1107 void Arguments::print_jvm_flags_on(outputStream* st) {
1108 if (_num_jvm_flags > 0) {
1109 for (int i=0; i < _num_jvm_flags; i++) {
1110 st->print("%s ", _jvm_flags_array[i]);
1111 }
1112 }
1113 }
1114
1115 void Arguments::print_jvm_args_on(outputStream* st) {
1116 if (_num_jvm_args > 0) {
1117 for (int i=0; i < _num_jvm_args; i++) {
1118 st->print("%s ", _jvm_args_array[i]);
1119 }
1120 }
1121 }
1122
1123 bool Arguments::process_argument(const char* arg,
1124 jboolean ignore_unrecognized,
1125 JVMFlagOrigin origin) {
1126 JDK_Version since = JDK_Version();
1127
1128 if (parse_argument(arg, origin)) {
1129 return true;
1130 }
1131
1132 // Determine if the flag has '+', '-', or '=' characters.
1133 bool has_plus_minus = (*arg == '+' || *arg == '-');
1134 const char* const argname = has_plus_minus ? arg + 1 : arg;
1135
1136 size_t arg_len;
1137 const char* equal_sign = strchr(argname, '=');
1138 if (equal_sign == nullptr) {
1139 arg_len = strlen(argname);
1140 } else {
1141 arg_len = equal_sign - argname;
1142 }
1143
1144 // Only make the obsolete check for valid arguments.
1145 if (arg_len <= BUFLEN) {
1146 // Construct a string which consists only of the argument name without '+', '-', or '='.
1147 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1148 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1149 if (is_obsolete_flag(stripped_argname, &since)) {
1150 char version[256];
1151 since.to_string(version, sizeof(version));
1152 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1153 return true;
1154 }
1155 }
1156
1157 // For locked flags, report a custom error message if available.
1158 // Otherwise, report the standard unrecognized VM option.
1159 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1160 if (found_flag != nullptr) {
1161 char locked_message_buf[BUFLEN];
1162 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1163 if (strlen(locked_message_buf) != 0) {
1164 #ifdef PRODUCT
1165 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1166 if (ignore_unrecognized && mismatched) {
1167 return true;
1168 }
1169 #endif
1170 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1171 }
1172 if (found_flag->is_bool() && !has_plus_minus) {
1173 jio_fprintf(defaultStream::error_stream(),
1174 "Missing +/- setting for VM option '%s'\n", argname);
1175 } else if (!found_flag->is_bool() && has_plus_minus) {
1176 jio_fprintf(defaultStream::error_stream(),
1177 "Unexpected +/- setting in VM option '%s'\n", argname);
1178 } else {
1179 jio_fprintf(defaultStream::error_stream(),
1180 "Improperly specified VM option '%s'\n", argname);
1181 }
1182 } else {
1183 if (ignore_unrecognized) {
1184 return true;
1185 }
1186 jio_fprintf(defaultStream::error_stream(),
1187 "Unrecognized VM option '%s'\n", argname);
1188 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1189 if (fuzzy_matched != nullptr) {
1190 jio_fprintf(defaultStream::error_stream(),
1191 "Did you mean '%s%s%s'?\n",
1192 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1193 fuzzy_matched->name(),
1194 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1195 }
1196 }
1197
1198 // allow for commandline "commenting out" options like -XX:#+Verbose
1199 return arg[0] == '#';
1200 }
1201
1202 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1203 FILE* stream = os::fopen(file_name, "rb");
1204 if (stream == nullptr) {
1205 if (should_exist) {
1206 jio_fprintf(defaultStream::error_stream(),
1207 "Could not open settings file %s\n", file_name);
1208 return false;
1209 } else {
1210 return true;
1211 }
1212 }
1213
1214 char token[1024];
1215 int pos = 0;
1216
1217 bool in_white_space = true;
1218 bool in_comment = false;
1219 bool in_quote = false;
1220 int quote_c = 0;
1221 bool result = true;
1222
1223 int c = getc(stream);
1224 while(c != EOF && pos < (int)(sizeof(token)-1)) {
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++] = checked_cast<char>(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++] = checked_cast<char>(c);
1253 }
1254 }
1255 c = 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 = MAX4(heap_alignment,
1469 os::vm_allocation_granularity(),
1470 os::max_page_size(),
1471 GCArguments::compute_heap_alignment());
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 void Arguments::set_heap_size() {
1506 julong phys_mem;
1507
1508 // If the user specified one of these options, they
1509 // want specific memory sizing so do not limit memory
1510 // based on compressed oops addressability.
1511 // Also, memory limits will be calculated based on
1512 // available os physical memory, not our MaxRAM limit,
1513 // unless MaxRAM is also specified.
1514 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1515 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1516 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1517 !FLAG_IS_DEFAULT(MaxRAM));
1518 if (override_coop_limit) {
1519 if (FLAG_IS_DEFAULT(MaxRAM)) {
1520 phys_mem = os::physical_memory();
1521 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1522 } else {
1523 phys_mem = (julong)MaxRAM;
1524 }
1525 } else {
1526 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1527 : (julong)MaxRAM;
1528 }
1529
1530 // If the maximum heap size has not been set with -Xmx,
1531 // then set it as fraction of the size of physical memory,
1532 // respecting the maximum and minimum sizes of the heap.
1533 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1534 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1535 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
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, (julong)MaxHeapSize);
1543 }
1544
1545 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1546 // Limit the heap size to ErgoHeapSizeLimit
1547 reasonable_max = MIN2(reasonable_max, (julong)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, (julong)InitialHeapSize);
1558 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1559 reasonable_max = MAX2(reasonable_max, (julong)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 if (UseCompressedOops) {
1578 // Limit the heap size to the maximum possible when using compressed oops
1579 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1580
1581 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1582 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1583 // but it should be not less than default MaxHeapSize.
1584 max_coop_heap -= HeapBaseMinAddress;
1585 }
1586
1587 // If user specified flags prioritizing os physical
1588 // memory limits, then disable compressed oops if
1589 // limits exceed max_coop_heap and UseCompressedOops
1590 // was not specified.
1591 if (reasonable_max > max_coop_heap) {
1592 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1593 aot_log_info(aot)("UseCompressedOops disabled due to"
1594 " max heap %zu > compressed oop heap %zu. "
1595 "Please check the setting of MaxRAMPercentage %5.2f."
1596 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1597 FLAG_SET_ERGO(UseCompressedOops, false);
1598 } else {
1599 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1600 }
1601 }
1602 }
1603 #endif // _LP64
1604
1605 log_trace(gc, heap)(" Maximum heap size %zu", (size_t) reasonable_max);
1606 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1607 }
1608
1609 // If the minimum or initial heap_size have not been set or requested to be set
1610 // ergonomically, set them accordingly.
1611 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1612 julong reasonable_minimum = (julong)(OldSize + NewSize);
1613
1614 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1615
1616 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1617
1618 if (InitialHeapSize == 0) {
1619 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1620 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1621
1622 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1623 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1624
1625 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1626 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize);
1627 }
1628 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1629 // synchronize with InitialHeapSize to avoid errors with the default value.
1630 if (MinHeapSize == 0) {
1631 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1632 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize);
1633 }
1634 }
1635 }
1636
1637 // This option inspects the machine and attempts to set various
1638 // parameters to be optimal for long-running, memory allocation
1639 // intensive jobs. It is intended for machines with large
1640 // amounts of cpu and memory.
1641 jint Arguments::set_aggressive_heap_flags() {
1642 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1643 // VM, but we may not be able to represent the total physical memory
1644 // available (like having 8gb of memory on a box but using a 32bit VM).
1645 // Thus, we need to make sure we're using a julong for intermediate
1646 // calculations.
1647 julong initHeapSize;
1648 julong total_memory = os::physical_memory();
1649
1650 if (total_memory < (julong) 256 * M) {
1651 jio_fprintf(defaultStream::error_stream(),
1652 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1653 vm_exit(1);
1654 }
1655
1656 // The heap size is half of available memory, or (at most)
1657 // all of possible memory less 160mb (leaving room for the OS
1658 // when using ISM). This is the maximum; because adaptive sizing
1659 // is turned on below, the actual space used may be smaller.
1660
1661 initHeapSize = MIN2(total_memory / (julong) 2,
1662 total_memory - (julong) 160 * M);
1663
1664 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1665
1666 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1667 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1668 return JNI_EINVAL;
1669 }
1670 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1671 return JNI_EINVAL;
1672 }
1673 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1674 return JNI_EINVAL;
1675 }
1676 }
1677 if (FLAG_IS_DEFAULT(NewSize)) {
1678 // Make the young generation 3/8ths of the total heap.
1679 if (FLAG_SET_CMDLINE(NewSize,
1680 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1681 return JNI_EINVAL;
1682 }
1683 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1684 return JNI_EINVAL;
1685 }
1686 }
1687
1688 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1689 FLAG_SET_DEFAULT(UseLargePages, true);
1690 #endif
1691
1692 // Increase some data structure sizes for efficiency
1693 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1694 return JNI_EINVAL;
1695 }
1696 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1697 return JNI_EINVAL;
1698 }
1699
1700 // See the OldPLABSize comment below, but replace 'after promotion'
1701 // with 'after copying'. YoungPLABSize is the size of the survivor
1702 // space per-gc-thread buffers. The default is 4kw.
1703 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1704 return JNI_EINVAL;
1705 }
1706
1707 // OldPLABSize is the size of the buffers in the old gen that
1708 // UseParallelGC uses to promote live data that doesn't fit in the
1709 // survivor spaces. At any given time, there's one for each gc thread.
1710 // The default size is 1kw. These buffers are rarely used, since the
1711 // survivor spaces are usually big enough. For specjbb, however, there
1712 // are occasions when there's lots of live data in the young gen
1713 // and we end up promoting some of it. We don't have a definite
1714 // explanation for why bumping OldPLABSize helps, but the theory
1715 // is that a bigger PLAB results in retaining something like the
1716 // original allocation order after promotion, which improves mutator
1717 // locality. A minor effect may be that larger PLABs reduce the
1718 // number of PLAB allocation events during gc. The value of 8kw
1719 // was arrived at by experimenting with specjbb.
1720 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1721 return JNI_EINVAL;
1722 }
1723
1724 // Enable parallel GC and adaptive generation sizing
1725 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1726 return JNI_EINVAL;
1727 }
1728
1729 // Encourage steady state memory management
1730 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1731 return JNI_EINVAL;
1732 }
1733
1734 return JNI_OK;
1735 }
1736
1737 // This must be called after ergonomics.
1738 void Arguments::set_bytecode_flags() {
1739 if (!RewriteBytecodes) {
1740 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1741 }
1742 }
1743
1744 // Aggressive optimization flags
1745 jint Arguments::set_aggressive_opts_flags() {
1746 #ifdef COMPILER2
1747 if (AggressiveUnboxing) {
1748 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1749 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1750 } else if (!EliminateAutoBox) {
1751 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1752 AggressiveUnboxing = false;
1753 }
1754 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1755 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1756 } else if (!DoEscapeAnalysis) {
1757 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1758 AggressiveUnboxing = false;
1759 }
1760 }
1761 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1762 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1763 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1764 }
1765 // Feed the cache size setting into the JDK
1766 char buffer[1024];
1767 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1768 if (!add_property(buffer)) {
1769 return JNI_ENOMEM;
1770 }
1771 }
1772 #endif
1773
1774 return JNI_OK;
1775 }
1776
1777 //===========================================================================================================
1778
1779 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1780 if (_sun_java_launcher != _default_java_launcher) {
1781 os::free(const_cast<char*>(_sun_java_launcher));
1782 }
1783 _sun_java_launcher = os::strdup_check_oom(launcher);
1784 }
1785
1786 bool Arguments::created_by_java_launcher() {
1787 assert(_sun_java_launcher != nullptr, "property must have value");
1788 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1789 }
1790
1791 bool Arguments::executing_unit_tests() {
1792 return _executing_unit_tests;
1793 }
1794
1795 //===========================================================================================================
1796 // Parsing of main arguments
1797
1798 static unsigned int addreads_count = 0;
1799 static unsigned int addexports_count = 0;
1800 static unsigned int addopens_count = 0;
1801 static unsigned int patch_mod_count = 0;
1802 static unsigned int enable_native_access_count = 0;
1803 static bool patch_mod_javabase = false;
1804
1805 // Check the consistency of vm_init_args
1806 bool Arguments::check_vm_args_consistency() {
1807 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1808 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
1809 return false;
1810 }
1811
1812 // Method for adding checks for flag consistency.
1813 // The intent is to warn the user of all possible conflicts,
1814 // before returning an error.
1815 // Note: Needs platform-dependent factoring.
1816 bool status = true;
1817
1818 if (TLABRefillWasteFraction == 0) {
1819 jio_fprintf(defaultStream::error_stream(),
1820 "TLABRefillWasteFraction should be a denominator, "
1821 "not %zu\n",
1822 TLABRefillWasteFraction);
1823 status = false;
1824 }
1825
1826 status = CompilerConfig::check_args_consistency(status);
1827 #if INCLUDE_JVMCI
1828 if (status && EnableJVMCI) {
1829 // Add the JVMCI module if not using libjvmci or EnableJVMCI
1830 // was explicitly set on the command line or in the jimage.
1831 if ((!UseJVMCINativeLibrary || FLAG_IS_CMDLINE(EnableJVMCI) || FLAG_IS_JIMAGE_RESOURCE(EnableJVMCI)) && ClassLoader::is_module_observable("jdk.internal.vm.ci") && !_jvmci_module_added) {
1832 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1833 return false;
1834 }
1835 }
1836 }
1837 #endif
1838
1839 #if INCLUDE_JFR
1840 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1841 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1842 return false;
1843 }
1844 }
1845 #endif
1846
1847 #ifndef SUPPORT_RESERVED_STACK_AREA
1848 if (StackReservedPages != 0) {
1849 FLAG_SET_CMDLINE(StackReservedPages, 0);
1850 warning("Reserved Stack Area not supported on this platform");
1851 }
1852 #endif
1853
1854 if (UseObjectMonitorTable && LockingMode != LM_LIGHTWEIGHT) {
1855 // ObjectMonitorTable requires lightweight locking.
1856 FLAG_SET_CMDLINE(UseObjectMonitorTable, false);
1857 warning("UseObjectMonitorTable requires LM_LIGHTWEIGHT");
1858 }
1859
1860 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1861 if (LockingMode == LM_MONITOR) {
1862 jio_fprintf(defaultStream::error_stream(),
1863 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1864 return false;
1865 }
1866 #endif
1867 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1868 jio_fprintf(defaultStream::error_stream(),
1869 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1870 return false;
1871 }
1872 return status;
1873 }
1874
1875 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1876 const char* option_type) {
1877 if (ignore) return false;
1878
1879 const char* spacer = " ";
1880 if (option_type == nullptr) {
1881 option_type = ++spacer; // Set both to the empty string.
1882 }
1883
1884 jio_fprintf(defaultStream::error_stream(),
1885 "Unrecognized %s%soption: %s\n", option_type, spacer,
1886 option->optionString);
1887 return true;
1888 }
1889
1890 static const char* user_assertion_options[] = {
1891 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1892 };
1893
1894 static const char* system_assertion_options[] = {
1895 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1896 };
1897
1898 bool Arguments::parse_uint(const char* value,
1899 uint* uint_arg,
1900 uint min_size) {
1901 uint n;
1902 if (!parse_integer(value, &n)) {
1903 return false;
1904 }
1905 if (n >= min_size) {
1906 *uint_arg = n;
1907 return true;
1908 } else {
1909 return false;
1910 }
1911 }
1912
1913 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1914 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1915 CDSConfig::check_internal_module_property(prop_name, prop_value);
1916 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1917 char* property = AllocateHeap(prop_len, mtArguments);
1918 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1919 if (ret < 0 || ret >= (int)prop_len) {
1920 FreeHeap(property);
1921 return false;
1922 }
1923 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1924 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1925 // that multiple occurrences of the associated flag just causes the existing property value to be
1926 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1927 // to a property after we have finished flag processing.
1928 bool added = add_property(property, WriteableProperty, internal);
1929 FreeHeap(property);
1930 return added;
1931 }
1932
1933 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1934 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1935 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1936 const unsigned int props_count_limit = 1000;
1937 const int max_digits = 3;
1938 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1939
1940 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1941 if (count < props_count_limit) {
1942 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1943 char* property = AllocateHeap(prop_len, mtArguments);
1944 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1945 if (ret < 0 || ret >= (int)prop_len) {
1946 FreeHeap(property);
1947 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1948 return false;
1949 }
1950 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1951 FreeHeap(property);
1952 return added;
1953 }
1954
1955 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1956 return false;
1957 }
1958
1959 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1960 julong* long_arg,
1961 julong min_size,
1962 julong max_size) {
1963 if (!parse_integer(s, long_arg)) return arg_unreadable;
1964 return check_memory_size(*long_arg, min_size, max_size);
1965 }
1966
1967 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) {
1968 // Save default settings for some mode flags
1969 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1970 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1971 Arguments::_ClipInlining = ClipInlining;
1972 Arguments::_BackgroundCompilation = BackgroundCompilation;
1973
1974 // Remember the default value of SharedBaseAddress.
1975 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1976
1977 // Setup flags for mixed which is the default
1978 set_mode_flags(_mixed);
1979
1980 jint result;
1981 for (int i = 0; i < all_args->length(); i++) {
1982 result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin);
1983 if (result != JNI_OK) {
1984 return result;
1985 }
1986 }
1987
1988 // Disable CDS for exploded image
1989 if (!has_jimage()) {
1990 no_shared_spaces("CDS disabled on exploded JDK");
1991 }
1992
1993 // We need to ensure processor and memory resources have been properly
1994 // configured - which may rely on arguments we just processed - before
1995 // doing the final argument processing. Any argument processing that
1996 // needs to know about processor and memory resources must occur after
1997 // this point.
1998
1999 os::init_container_support();
2000
2001 SystemMemoryBarrier::initialize();
2002
2003 // Do final processing now that all arguments have been parsed
2004 result = finalize_vm_init_args();
2005 if (result != JNI_OK) {
2006 return result;
2007 }
2008
2009 return JNI_OK;
2010 }
2011
2012 #if !INCLUDE_JVMTI || INCLUDE_CDS
2013 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2014 // represents a valid JDWP agent. is_path==true denotes that we
2015 // are dealing with -agentpath (case where name is a path), otherwise with
2016 // -agentlib
2017 static bool valid_jdwp_agent(char *name, bool is_path) {
2018 char *_name;
2019 const char *_jdwp = "jdwp";
2020 size_t _len_jdwp, _len_prefix;
2021
2022 if (is_path) {
2023 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2024 return false;
2025 }
2026
2027 _name++; // skip past last path separator
2028 _len_prefix = strlen(JNI_LIB_PREFIX);
2029
2030 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2031 return false;
2032 }
2033
2034 _name += _len_prefix;
2035 _len_jdwp = strlen(_jdwp);
2036
2037 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2038 _name += _len_jdwp;
2039 }
2040 else {
2041 return false;
2042 }
2043
2044 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2045 return false;
2046 }
2047
2048 return true;
2049 }
2050
2051 if (strcmp(name, _jdwp) == 0) {
2052 return true;
2053 }
2054
2055 return false;
2056 }
2057 #endif
2058
2059 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2060 // --patch-module=<module>=<file>(<pathsep><file>)*
2061 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2062 // Find the equal sign between the module name and the path specification
2063 const char* module_equal = strchr(patch_mod_tail, '=');
2064 if (module_equal == nullptr) {
2065 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2066 return JNI_ERR;
2067 } else {
2068 // Pick out the module name
2069 size_t module_len = module_equal - patch_mod_tail;
2070 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2071 if (module_name != nullptr) {
2072 memcpy(module_name, patch_mod_tail, module_len);
2073 *(module_name + module_len) = '\0';
2074 // The path piece begins one past the module_equal sign
2075 add_patch_mod_prefix(module_name, module_equal + 1);
2076 FREE_C_HEAP_ARRAY(char, module_name);
2077 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2078 return JNI_ENOMEM;
2079 }
2080 } else {
2081 return JNI_ENOMEM;
2082 }
2083 }
2084 return JNI_OK;
2085 }
2086
2087 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2088 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2089 // The min and max sizes match the values in globals.hpp, but scaled
2090 // with K. The values have been chosen so that alignment with page
2091 // size doesn't change the max value, which makes the conversions
2092 // back and forth between Xss value and ThreadStackSize value easier.
2093 // The values have also been chosen to fit inside a 32-bit signed type.
2094 const julong min_ThreadStackSize = 0;
2095 const julong max_ThreadStackSize = 1 * M;
2096
2097 // Make sure the above values match the range set in globals.hpp
2098 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2099 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2100 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2101
2102 const julong min_size = min_ThreadStackSize * K;
2103 const julong max_size = max_ThreadStackSize * K;
2104
2105 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2106
2107 julong size = 0;
2108 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2109 if (errcode != arg_in_range) {
2110 bool silent = (option == nullptr); // Allow testing to silence error messages
2111 if (!silent) {
2112 jio_fprintf(defaultStream::error_stream(),
2113 "Invalid thread stack size: %s\n", option->optionString);
2114 describe_range_error(errcode);
2115 }
2116 return JNI_EINVAL;
2117 }
2118
2119 // Internally track ThreadStackSize in units of 1024 bytes.
2120 const julong size_aligned = align_up(size, K);
2121 assert(size <= size_aligned,
2122 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2123 size, size_aligned);
2124
2125 const julong size_in_K = size_aligned / K;
2126 assert(size_in_K < (julong)max_intx,
2127 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2128 size_in_K);
2129
2130 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2131 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2132 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2133 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2134 max_expanded, size_in_K);
2135
2136 *out_ThreadStackSize = (intx)size_in_K;
2137
2138 return JNI_OK;
2139 }
2140
2141 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2142 // For match_option to return remaining or value part of option string
2143 const char* tail;
2144
2145 // iterate over arguments
2146 for (int index = 0; index < args->nOptions; index++) {
2147 bool is_absolute_path = false; // for -agentpath vs -agentlib
2148
2149 const JavaVMOption* option = args->options + index;
2150
2151 if (!match_option(option, "-Djava.class.path", &tail) &&
2152 !match_option(option, "-Dsun.java.command", &tail) &&
2153 !match_option(option, "-Dsun.java.launcher", &tail)) {
2154
2155 // add all jvm options to the jvm_args string. This string
2156 // is used later to set the java.vm.args PerfData string constant.
2157 // the -Djava.class.path and the -Dsun.java.command options are
2158 // omitted from jvm_args string as each have their own PerfData
2159 // string constant object.
2160 build_jvm_args(option->optionString);
2161 }
2162
2163 // -verbose:[class/module/gc/jni]
2164 if (match_option(option, "-verbose", &tail)) {
2165 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2166 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2167 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2168 } else if (!strcmp(tail, ":module")) {
2169 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2170 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2171 } else if (!strcmp(tail, ":gc")) {
2172 if (_legacyGCLogging.lastFlag == 0) {
2173 _legacyGCLogging.lastFlag = 1;
2174 }
2175 } else if (!strcmp(tail, ":jni")) {
2176 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2177 }
2178 // -da / -ea / -disableassertions / -enableassertions
2179 // These accept an optional class/package name separated by a colon, e.g.,
2180 // -da:java.lang.Thread.
2181 } else if (match_option(option, user_assertion_options, &tail, true)) {
2182 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2183 if (*tail == '\0') {
2184 JavaAssertions::setUserClassDefault(enable);
2185 } else {
2186 assert(*tail == ':', "bogus match by match_option()");
2187 JavaAssertions::addOption(tail + 1, enable);
2188 }
2189 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2190 } else if (match_option(option, system_assertion_options, &tail, false)) {
2191 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2192 JavaAssertions::setSystemClassDefault(enable);
2193 // -bootclasspath:
2194 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2195 jio_fprintf(defaultStream::output_stream(),
2196 "-Xbootclasspath is no longer a supported option.\n");
2197 return JNI_EINVAL;
2198 // -bootclasspath/a:
2199 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2200 Arguments::append_sysclasspath(tail);
2201 // -bootclasspath/p:
2202 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2203 jio_fprintf(defaultStream::output_stream(),
2204 "-Xbootclasspath/p is no longer a supported option.\n");
2205 return JNI_EINVAL;
2206 // -Xrun
2207 } else if (match_option(option, "-Xrun", &tail)) {
2208 if (tail != nullptr) {
2209 const char* pos = strchr(tail, ':');
2210 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2211 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2212 jio_snprintf(name, len + 1, "%s", tail);
2213
2214 char *options = nullptr;
2215 if(pos != nullptr) {
2216 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2217 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2218 }
2219 #if !INCLUDE_JVMTI
2220 if (strcmp(name, "jdwp") == 0) {
2221 jio_fprintf(defaultStream::error_stream(),
2222 "Debugging agents are not supported in this VM\n");
2223 return JNI_ERR;
2224 }
2225 #endif // !INCLUDE_JVMTI
2226 JvmtiAgentList::add_xrun(name, options, false);
2227 FREE_C_HEAP_ARRAY(char, name);
2228 FREE_C_HEAP_ARRAY(char, options);
2229 }
2230 } else if (match_option(option, "--add-reads=", &tail)) {
2231 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2232 return JNI_ENOMEM;
2233 }
2234 } else if (match_option(option, "--add-exports=", &tail)) {
2235 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2236 return JNI_ENOMEM;
2237 }
2238 } else if (match_option(option, "--add-opens=", &tail)) {
2239 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2240 return JNI_ENOMEM;
2241 }
2242 } else if (match_option(option, "--add-modules=", &tail)) {
2243 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2244 return JNI_ENOMEM;
2245 }
2246 #if INCLUDE_JVMCI
2247 if (!_jvmci_module_added) {
2248 const char *jvmci_module = strstr(tail, "jdk.internal.vm.ci");
2249 if (jvmci_module != nullptr) {
2250 char before = *(jvmci_module - 1);
2251 char after = *(jvmci_module + strlen("jdk.internal.vm.ci"));
2252 if ((before == '=' || before == ',') && (after == '\0' || after == ',')) {
2253 FLAG_SET_DEFAULT(EnableJVMCI, true);
2254 _jvmci_module_added = true;
2255 }
2256 }
2257 }
2258 #endif
2259 } else if (match_option(option, "--enable-native-access=", &tail)) {
2260 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2261 return JNI_ENOMEM;
2262 }
2263 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2264 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2265 return JNI_ENOMEM;
2266 }
2267 } else if (match_option(option, "--limit-modules=", &tail)) {
2268 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2269 return JNI_ENOMEM;
2270 }
2271 } else if (match_option(option, "--module-path=", &tail)) {
2272 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2273 return JNI_ENOMEM;
2274 }
2275 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2276 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2277 return JNI_ENOMEM;
2278 }
2279 } else if (match_option(option, "--patch-module=", &tail)) {
2280 // --patch-module=<module>=<file>(<pathsep><file>)*
2281 int res = process_patch_mod_option(tail);
2282 if (res != JNI_OK) {
2283 return res;
2284 }
2285 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2286 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2287 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2288 AddProperty, WriteableProperty, InternalProperty);
2289 } else {
2290 jio_fprintf(defaultStream::error_stream(),
2291 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2292 return JNI_ERR;
2293 }
2294 } else if (match_option(option, "--illegal-access=", &tail)) {
2295 char version[256];
2296 JDK_Version::jdk(17).to_string(version, sizeof(version));
2297 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2298 // -agentlib and -agentpath
2299 } else if (match_option(option, "-agentlib:", &tail) ||
2300 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2301 if(tail != nullptr) {
2302 const char* pos = strchr(tail, '=');
2303 char* name;
2304 if (pos == nullptr) {
2305 name = os::strdup_check_oom(tail, mtArguments);
2306 } else {
2307 size_t len = pos - tail;
2308 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2309 memcpy(name, tail, len);
2310 name[len] = '\0';
2311 }
2312
2313 char *options = nullptr;
2314 if(pos != nullptr) {
2315 options = os::strdup_check_oom(pos + 1, mtArguments);
2316 }
2317 #if !INCLUDE_JVMTI
2318 if (valid_jdwp_agent(name, is_absolute_path)) {
2319 jio_fprintf(defaultStream::error_stream(),
2320 "Debugging agents are not supported in this VM\n");
2321 return JNI_ERR;
2322 }
2323 #elif INCLUDE_CDS
2324 if (valid_jdwp_agent(name, is_absolute_path)) {
2325 _has_jdwp_agent = true;
2326 }
2327 #endif // !INCLUDE_JVMTI
2328 JvmtiAgentList::add(name, options, is_absolute_path);
2329 os::free(name);
2330 os::free(options);
2331 }
2332 // -javaagent
2333 } else if (match_option(option, "-javaagent:", &tail)) {
2334 #if !INCLUDE_JVMTI
2335 jio_fprintf(defaultStream::error_stream(),
2336 "Instrumentation agents are not supported in this VM\n");
2337 return JNI_ERR;
2338 #else
2339 if (tail != nullptr) {
2340 size_t length = strlen(tail) + 1;
2341 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2342 jio_snprintf(options, length, "%s", tail);
2343 JvmtiAgentList::add("instrument", options, false);
2344 FREE_C_HEAP_ARRAY(char, options);
2345
2346 // java agents need module java.instrument
2347 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2348 return JNI_ENOMEM;
2349 }
2350 }
2351 #endif // !INCLUDE_JVMTI
2352 // --enable_preview
2353 } else if (match_option(option, "--enable-preview")) {
2354 set_enable_preview();
2355 // -Xnoclassgc
2356 } else if (match_option(option, "-Xnoclassgc")) {
2357 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2358 return JNI_EINVAL;
2359 }
2360 // -Xbatch
2361 } else if (match_option(option, "-Xbatch")) {
2362 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2363 return JNI_EINVAL;
2364 }
2365 // -Xmn for compatibility with other JVM vendors
2366 } else if (match_option(option, "-Xmn", &tail)) {
2367 julong long_initial_young_size = 0;
2368 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2369 if (errcode != arg_in_range) {
2370 jio_fprintf(defaultStream::error_stream(),
2371 "Invalid initial young generation size: %s\n", option->optionString);
2372 describe_range_error(errcode);
2373 return JNI_EINVAL;
2374 }
2375 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2376 return JNI_EINVAL;
2377 }
2378 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2379 return JNI_EINVAL;
2380 }
2381 // -Xms
2382 } else if (match_option(option, "-Xms", &tail)) {
2383 julong size = 0;
2384 // an initial heap size of 0 means automatically determine
2385 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2386 if (errcode != arg_in_range) {
2387 jio_fprintf(defaultStream::error_stream(),
2388 "Invalid initial heap size: %s\n", option->optionString);
2389 describe_range_error(errcode);
2390 return JNI_EINVAL;
2391 }
2392 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2393 return JNI_EINVAL;
2394 }
2395 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2396 return JNI_EINVAL;
2397 }
2398 // -Xmx
2399 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2400 julong long_max_heap_size = 0;
2401 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2402 if (errcode != arg_in_range) {
2403 jio_fprintf(defaultStream::error_stream(),
2404 "Invalid maximum heap size: %s\n", option->optionString);
2405 describe_range_error(errcode);
2406 return JNI_EINVAL;
2407 }
2408 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2409 return JNI_EINVAL;
2410 }
2411 // Xmaxf
2412 } else if (match_option(option, "-Xmaxf", &tail)) {
2413 char* err;
2414 int maxf = (int)(strtod(tail, &err) * 100);
2415 if (*err != '\0' || *tail == '\0') {
2416 jio_fprintf(defaultStream::error_stream(),
2417 "Bad max heap free percentage size: %s\n",
2418 option->optionString);
2419 return JNI_EINVAL;
2420 } else {
2421 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2422 return JNI_EINVAL;
2423 }
2424 }
2425 // Xminf
2426 } else if (match_option(option, "-Xminf", &tail)) {
2427 char* err;
2428 int minf = (int)(strtod(tail, &err) * 100);
2429 if (*err != '\0' || *tail == '\0') {
2430 jio_fprintf(defaultStream::error_stream(),
2431 "Bad min heap free percentage size: %s\n",
2432 option->optionString);
2433 return JNI_EINVAL;
2434 } else {
2435 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2436 return JNI_EINVAL;
2437 }
2438 }
2439 // -Xss
2440 } else if (match_option(option, "-Xss", &tail)) {
2441 intx value = 0;
2442 jint err = parse_xss(option, tail, &value);
2443 if (err != JNI_OK) {
2444 return err;
2445 }
2446 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2447 return JNI_EINVAL;
2448 }
2449 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2450 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2451 julong long_ReservedCodeCacheSize = 0;
2452
2453 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2454 if (errcode != arg_in_range) {
2455 jio_fprintf(defaultStream::error_stream(),
2456 "Invalid maximum code cache size: %s.\n", option->optionString);
2457 return JNI_EINVAL;
2458 }
2459 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2460 return JNI_EINVAL;
2461 }
2462 // -green
2463 } else if (match_option(option, "-green")) {
2464 jio_fprintf(defaultStream::error_stream(),
2465 "Green threads support not available\n");
2466 return JNI_EINVAL;
2467 // -native
2468 } else if (match_option(option, "-native")) {
2469 // HotSpot always uses native threads, ignore silently for compatibility
2470 // -Xrs
2471 } else if (match_option(option, "-Xrs")) {
2472 // Classic/EVM option, new functionality
2473 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2474 return JNI_EINVAL;
2475 }
2476 // -Xprof
2477 } else if (match_option(option, "-Xprof")) {
2478 char version[256];
2479 // Obsolete in JDK 10
2480 JDK_Version::jdk(10).to_string(version, sizeof(version));
2481 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2482 // -Xinternalversion
2483 } else if (match_option(option, "-Xinternalversion")) {
2484 jio_fprintf(defaultStream::output_stream(), "%s\n",
2485 VM_Version::internal_vm_info_string());
2486 vm_exit(0);
2487 #ifndef PRODUCT
2488 // -Xprintflags
2489 } else if (match_option(option, "-Xprintflags")) {
2490 JVMFlag::printFlags(tty, false);
2491 vm_exit(0);
2492 #endif
2493 // -D
2494 } else if (match_option(option, "-D", &tail)) {
2495 const char* value;
2496 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2497 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2498 // abort if -Djava.endorsed.dirs is set
2499 jio_fprintf(defaultStream::output_stream(),
2500 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2501 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2502 return JNI_EINVAL;
2503 }
2504 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2505 *value != '\0' && strcmp(value, "\"\"") != 0) {
2506 // abort if -Djava.ext.dirs is set
2507 jio_fprintf(defaultStream::output_stream(),
2508 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2509 return JNI_EINVAL;
2510 }
2511 // Check for module related properties. They must be set using the modules
2512 // options. For example: use "--add-modules=java.sql", not
2513 // "-Djdk.module.addmods=java.sql"
2514 if (is_internal_module_property(option->optionString + 2)) {
2515 needs_module_property_warning = true;
2516 continue;
2517 }
2518 if (!add_property(tail)) {
2519 return JNI_ENOMEM;
2520 }
2521 // Out of the box management support
2522 if (match_option(option, "-Dcom.sun.management", &tail)) {
2523 #if INCLUDE_MANAGEMENT
2524 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2525 return JNI_EINVAL;
2526 }
2527 // management agent in module jdk.management.agent
2528 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2529 return JNI_ENOMEM;
2530 }
2531 #else
2532 jio_fprintf(defaultStream::output_stream(),
2533 "-Dcom.sun.management is not supported in this VM.\n");
2534 return JNI_ERR;
2535 #endif
2536 }
2537 // -Xint
2538 } else if (match_option(option, "-Xint")) {
2539 set_mode_flags(_int);
2540 mode_flag_cmd_line = true;
2541 // -Xmixed
2542 } else if (match_option(option, "-Xmixed")) {
2543 set_mode_flags(_mixed);
2544 mode_flag_cmd_line = true;
2545 // -Xcomp
2546 } else if (match_option(option, "-Xcomp")) {
2547 // for testing the compiler; turn off all flags that inhibit compilation
2548 set_mode_flags(_comp);
2549 mode_flag_cmd_line = true;
2550 // -Xshare:dump
2551 } else if (match_option(option, "-Xshare:dump")) {
2552 CDSConfig::enable_dumping_static_archive();
2553 CDSConfig::set_old_cds_flags_used();
2554 // -Xshare:on
2555 } else if (match_option(option, "-Xshare:on")) {
2556 UseSharedSpaces = true;
2557 RequireSharedSpaces = true;
2558 CDSConfig::set_old_cds_flags_used();
2559 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2560 } else if (match_option(option, "-Xshare:auto")) {
2561 UseSharedSpaces = true;
2562 RequireSharedSpaces = false;
2563 xshare_auto_cmd_line = true;
2564 CDSConfig::set_old_cds_flags_used();
2565 // -Xshare:off
2566 } else if (match_option(option, "-Xshare:off")) {
2567 UseSharedSpaces = false;
2568 RequireSharedSpaces = false;
2569 CDSConfig::set_old_cds_flags_used();
2570 // -Xverify
2571 } else if (match_option(option, "-Xverify", &tail)) {
2572 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2573 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2574 return JNI_EINVAL;
2575 }
2576 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2577 return JNI_EINVAL;
2578 }
2579 } else if (strcmp(tail, ":remote") == 0) {
2580 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2581 return JNI_EINVAL;
2582 }
2583 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2584 return JNI_EINVAL;
2585 }
2586 } else if (strcmp(tail, ":none") == 0) {
2587 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2588 return JNI_EINVAL;
2589 }
2590 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2591 return JNI_EINVAL;
2592 }
2593 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2594 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2595 return JNI_EINVAL;
2596 }
2597 // -Xdebug
2598 } else if (match_option(option, "-Xdebug")) {
2599 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2600 } else if (match_option(option, "-Xloggc:", &tail)) {
2601 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2602 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2603 _legacyGCLogging.lastFlag = 2;
2604 _legacyGCLogging.file = os::strdup_check_oom(tail);
2605 } else if (match_option(option, "-Xlog", &tail)) {
2606 bool ret = false;
2607 if (strcmp(tail, ":help") == 0) {
2608 fileStream stream(defaultStream::output_stream());
2609 LogConfiguration::print_command_line_help(&stream);
2610 vm_exit(0);
2611 } else if (strcmp(tail, ":disable") == 0) {
2612 LogConfiguration::disable_logging();
2613 ret = true;
2614 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2615 const char* async_tail = tail + strlen(":async");
2616 ret = LogConfiguration::parse_async_argument(async_tail);
2617 } else if (*tail == '\0') {
2618 ret = LogConfiguration::parse_command_line_arguments();
2619 assert(ret, "-Xlog without arguments should never fail to parse");
2620 } else if (*tail == ':') {
2621 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2622 }
2623 if (ret == false) {
2624 jio_fprintf(defaultStream::error_stream(),
2625 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2626 tail);
2627 return JNI_EINVAL;
2628 }
2629 // JNI hooks
2630 } else if (match_option(option, "-Xcheck", &tail)) {
2631 if (!strcmp(tail, ":jni")) {
2632 #if !INCLUDE_JNI_CHECK
2633 warning("JNI CHECKING is not supported in this VM");
2634 #else
2635 CheckJNICalls = true;
2636 #endif // INCLUDE_JNI_CHECK
2637 } else if (is_bad_option(option, args->ignoreUnrecognized,
2638 "check")) {
2639 return JNI_EINVAL;
2640 }
2641 } else if (match_option(option, "vfprintf")) {
2642 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2643 } else if (match_option(option, "exit")) {
2644 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2645 } else if (match_option(option, "abort")) {
2646 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2647 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2648 // and the last option wins.
2649 } else if (match_option(option, "-XX:+NeverTenure")) {
2650 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2651 return JNI_EINVAL;
2652 }
2653 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2654 return JNI_EINVAL;
2655 }
2656 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2657 return JNI_EINVAL;
2658 }
2659 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2660 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2661 return JNI_EINVAL;
2662 }
2663 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2664 return JNI_EINVAL;
2665 }
2666 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2667 return JNI_EINVAL;
2668 }
2669 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2670 uint max_tenuring_thresh = 0;
2671 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2672 jio_fprintf(defaultStream::error_stream(),
2673 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2674 return JNI_EINVAL;
2675 }
2676
2677 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2678 return JNI_EINVAL;
2679 }
2680
2681 if (MaxTenuringThreshold == 0) {
2682 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2683 return JNI_EINVAL;
2684 }
2685 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2686 return JNI_EINVAL;
2687 }
2688 } else {
2689 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2690 return JNI_EINVAL;
2691 }
2692 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2693 return JNI_EINVAL;
2694 }
2695 }
2696 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2697 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2698 return JNI_EINVAL;
2699 }
2700 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2701 return JNI_EINVAL;
2702 }
2703 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2704 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2705 return JNI_EINVAL;
2706 }
2707 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2708 return JNI_EINVAL;
2709 }
2710 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2711 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2712 return JNI_EINVAL;
2713 }
2714 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2715 return JNI_EINVAL;
2716 }
2717 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2718 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2719 return JNI_EINVAL;
2720 }
2721 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2722 return JNI_EINVAL;
2723 }
2724 } else if (match_option(option, "--finalization=", &tail)) {
2725 if (strcmp(tail, "enabled") == 0) {
2726 InstanceKlass::set_finalization_enabled(true);
2727 } else if (strcmp(tail, "disabled") == 0) {
2728 InstanceKlass::set_finalization_enabled(false);
2729 } else {
2730 jio_fprintf(defaultStream::error_stream(),
2731 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2732 tail);
2733 return JNI_EINVAL;
2734 }
2735 #if !defined(DTRACE_ENABLED)
2736 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2737 jio_fprintf(defaultStream::error_stream(),
2738 "DTraceMethodProbes flag is not applicable for this configuration\n");
2739 return JNI_EINVAL;
2740 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2741 jio_fprintf(defaultStream::error_stream(),
2742 "DTraceAllocProbes flag is not applicable for this configuration\n");
2743 return JNI_EINVAL;
2744 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2745 jio_fprintf(defaultStream::error_stream(),
2746 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2747 return JNI_EINVAL;
2748 #endif // !defined(DTRACE_ENABLED)
2749 #ifdef ASSERT
2750 } else if (match_option(option, "-XX:+FullGCALot")) {
2751 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2752 return JNI_EINVAL;
2753 }
2754 #endif
2755 #if !INCLUDE_MANAGEMENT
2756 } else if (match_option(option, "-XX:+ManagementServer")) {
2757 jio_fprintf(defaultStream::error_stream(),
2758 "ManagementServer is not supported in this VM.\n");
2759 return JNI_ERR;
2760 #endif // INCLUDE_MANAGEMENT
2761 #if INCLUDE_JVMCI
2762 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2763 if (EnableJVMCIProduct) {
2764 jio_fprintf(defaultStream::error_stream(),
2765 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2766 return JNI_EINVAL;
2767 }
2768 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2769 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2770 if (use_graal_jit) {
2771 const char* jvmci_compiler = get_property("jvmci.Compiler");
2772 if (jvmci_compiler != nullptr) {
2773 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2774 jio_fprintf(defaultStream::error_stream(),
2775 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2776 return JNI_ERR;
2777 }
2778 } else if (!add_property("jvmci.Compiler=graal")) {
2779 return JNI_ENOMEM;
2780 }
2781 }
2782
2783 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2784 if (EnableJVMCIProduct) {
2785 continue;
2786 }
2787 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2788 // Allow this flag if it has been unlocked.
2789 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2790 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2791 jio_fprintf(defaultStream::error_stream(),
2792 "Unable to enable JVMCI in product mode\n");
2793 return JNI_ERR;
2794 }
2795 }
2796 // The flag was locked so process normally to report that error
2797 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2798 return JNI_EINVAL;
2799 }
2800 #endif // INCLUDE_JVMCI
2801 #if INCLUDE_JFR
2802 } else if (match_jfr_option(&option)) {
2803 return JNI_EINVAL;
2804 #endif
2805 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2806 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2807 // already been handled
2808 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2809 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2810 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2811 return JNI_EINVAL;
2812 }
2813 }
2814 // Unknown option
2815 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2816 return JNI_ERR;
2817 }
2818 }
2819
2820 // PrintSharedArchiveAndExit will turn on
2821 // -Xshare:on
2822 // -Xlog:class+path=info
2823 if (PrintSharedArchiveAndExit) {
2824 UseSharedSpaces = true;
2825 RequireSharedSpaces = true;
2826 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2827 }
2828
2829 fix_appclasspath();
2830
2831 return JNI_OK;
2832 }
2833
2834 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) {
2835 // For java.base check for duplicate --patch-module options being specified on the command line.
2836 // This check is only required for java.base, all other duplicate module specifications
2837 // will be checked during module system initialization. The module system initialization
2838 // will throw an ExceptionInInitializerError if this situation occurs.
2839 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2840 if (patch_mod_javabase) {
2841 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2842 } else {
2843 patch_mod_javabase = true;
2844 }
2845 }
2846
2847 // Create GrowableArray lazily, only if --patch-module has been specified
2848 if (_patch_mod_prefix == nullptr) {
2849 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2850 }
2851
2852 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2853 }
2854
2855 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2856 //
2857 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2858 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2859 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2860 // path is treated as the current directory.
2861 //
2862 // This causes problems with CDS, which requires that all directories specified in the classpath
2863 // must be empty. In most cases, applications do NOT want to load classes from the current
2864 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2865 // scripts compatible with CDS.
2866 void Arguments::fix_appclasspath() {
2867 if (IgnoreEmptyClassPaths) {
2868 const char separator = *os::path_separator();
2869 const char* src = _java_class_path->value();
2870
2871 // skip over all the leading empty paths
2872 while (*src == separator) {
2873 src ++;
2874 }
2875
2876 char* copy = os::strdup_check_oom(src, mtArguments);
2877
2878 // trim all trailing empty paths
2879 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2880 *tail = '\0';
2881 }
2882
2883 char from[3] = {separator, separator, '\0'};
2884 char to [2] = {separator, '\0'};
2885 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2886 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2887 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2888 }
2889
2890 _java_class_path->set_writeable_value(copy);
2891 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2892 }
2893 }
2894
2895 jint Arguments::finalize_vm_init_args() {
2896 // check if the default lib/endorsed directory exists; if so, error
2897 char path[JVM_MAXPATHLEN];
2898 const char* fileSep = os::file_separator();
2899 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2900
2901 DIR* dir = os::opendir(path);
2902 if (dir != nullptr) {
2903 jio_fprintf(defaultStream::output_stream(),
2904 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2905 "in modular form will be supported via the concept of upgradeable modules.\n");
2906 os::closedir(dir);
2907 return JNI_ERR;
2908 }
2909
2910 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2911 dir = os::opendir(path);
2912 if (dir != nullptr) {
2913 jio_fprintf(defaultStream::output_stream(),
2914 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2915 "Use -classpath instead.\n.");
2916 os::closedir(dir);
2917 return JNI_ERR;
2918 }
2919
2920 // This must be done after all arguments have been processed
2921 // and the container support has been initialized since AggressiveHeap
2922 // relies on the amount of total memory available.
2923 if (AggressiveHeap) {
2924 jint result = set_aggressive_heap_flags();
2925 if (result != JNI_OK) {
2926 return result;
2927 }
2928 }
2929
2930 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2931 // but like -Xint, leave compilation thresholds unaffected.
2932 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2933 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2934 set_mode_flags(_int);
2935 }
2936
2937 #ifdef ZERO
2938 // Zero always runs in interpreted mode
2939 set_mode_flags(_int);
2940 #endif
2941
2942 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2943 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2944 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2945 }
2946
2947 #if !COMPILER2_OR_JVMCI
2948 // Don't degrade server performance for footprint
2949 if (FLAG_IS_DEFAULT(UseLargePages) &&
2950 MaxHeapSize < LargePageHeapSizeThreshold) {
2951 // No need for large granularity pages w/small heaps.
2952 // Note that large pages are enabled/disabled for both the
2953 // Java heap and the code cache.
2954 FLAG_SET_DEFAULT(UseLargePages, false);
2955 }
2956
2957 UNSUPPORTED_OPTION(ProfileInterpreter);
2958 #endif
2959
2960 // Parse the CompilationMode flag
2961 if (!CompilationModeFlag::initialize()) {
2962 return JNI_ERR;
2963 }
2964
2965 if (!check_vm_args_consistency()) {
2966 return JNI_ERR;
2967 }
2968
2969
2970 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2971 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2972 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2973
2974 return JNI_OK;
2975 }
2976
2977 // Helper class for controlling the lifetime of JavaVMInitArgs
2978 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2979 // deleted on the destruction of the ScopedVMInitArgs object.
2980 class ScopedVMInitArgs : public StackObj {
2981 private:
2982 JavaVMInitArgs _args;
2983 char* _container_name;
2984 bool _is_set;
2985 char* _vm_options_file_arg;
2986
2987 public:
2988 ScopedVMInitArgs(const char *container_name) {
2989 _args.version = JNI_VERSION_1_2;
2990 _args.nOptions = 0;
2991 _args.options = nullptr;
2992 _args.ignoreUnrecognized = false;
2993 _container_name = (char *)container_name;
2994 _is_set = false;
2995 _vm_options_file_arg = nullptr;
2996 }
2997
2998 // Populates the JavaVMInitArgs object represented by this
2999 // ScopedVMInitArgs object with the arguments in options. The
3000 // allocated memory is deleted by the destructor. If this method
3001 // returns anything other than JNI_OK, then this object is in a
3002 // partially constructed state, and should be abandoned.
3003 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3004 _is_set = true;
3005 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3006 JavaVMOption, options->length(), mtArguments);
3007 if (options_arr == nullptr) {
3008 return JNI_ENOMEM;
3009 }
3010 _args.options = options_arr;
3011
3012 for (int i = 0; i < options->length(); i++) {
3013 options_arr[i] = options->at(i);
3014 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3015 if (options_arr[i].optionString == nullptr) {
3016 // Rely on the destructor to do cleanup.
3017 _args.nOptions = i;
3018 return JNI_ENOMEM;
3019 }
3020 }
3021
3022 _args.nOptions = options->length();
3023 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3024 return JNI_OK;
3025 }
3026
3027 JavaVMInitArgs* get() { return &_args; }
3028 char* container_name() { return _container_name; }
3029 bool is_set() { return _is_set; }
3030 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3031 char* vm_options_file_arg() { return _vm_options_file_arg; }
3032
3033 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3034 if (_vm_options_file_arg != nullptr) {
3035 os::free(_vm_options_file_arg);
3036 }
3037 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3038 }
3039
3040 ~ScopedVMInitArgs() {
3041 if (_vm_options_file_arg != nullptr) {
3042 os::free(_vm_options_file_arg);
3043 }
3044 if (_args.options == nullptr) return;
3045 for (int i = 0; i < _args.nOptions; i++) {
3046 os::free(_args.options[i].optionString);
3047 }
3048 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3049 }
3050
3051 // Insert options into this option list, to replace option at
3052 // vm_options_file_pos (-XX:VMOptionsFile)
3053 jint insert(const JavaVMInitArgs* args,
3054 const JavaVMInitArgs* args_to_insert,
3055 const int vm_options_file_pos) {
3056 assert(_args.options == nullptr, "shouldn't be set yet");
3057 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3058 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3059
3060 int length = args->nOptions + args_to_insert->nOptions - 1;
3061 // Construct new option array
3062 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3063 for (int i = 0; i < args->nOptions; i++) {
3064 if (i == vm_options_file_pos) {
3065 // insert the new options starting at the same place as the
3066 // -XX:VMOptionsFile option
3067 for (int j = 0; j < args_to_insert->nOptions; j++) {
3068 options.push(args_to_insert->options[j]);
3069 }
3070 } else {
3071 options.push(args->options[i]);
3072 }
3073 }
3074 // make into options array
3075 return set_args(&options);
3076 }
3077 };
3078
3079 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3080 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3081 }
3082
3083 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3084 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3085 }
3086
3087 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) {
3088 for (int index = args->nOptions - 1; index >= 0; index--) {
3089 JavaVMOption* option = args->options + index;
3090 if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) {
3091 return option;
3092 }
3093 }
3094
3095 return nullptr;
3096 }
3097
3098 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args,
3099 ScopedVMInitArgs* jdk_aot_vm_options_args) {
3100 // Don't bother scanning all the args if this env variable is not set
3101 if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) {
3102 return JNI_OK;
3103 }
3104
3105 // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value
3106 // of AOTMode.
3107 JavaVMOption* option = nullptr;
3108 for (int i = all_args->length() - 1; i >= 0; i--) {
3109 if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) {
3110 break;
3111 }
3112 }
3113
3114 if (option != nullptr) {
3115 // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet,
3116 // so its value is not reflected inside the global variable AOTMode.
3117 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) {
3118 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3119 }
3120 } else {
3121 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode,
3122 // which would have been set inside process_settings_file();
3123 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) {
3124 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3125 }
3126 }
3127
3128 return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args);
3129 }
3130
3131 jint Arguments::parse_options_environment_variable(const char* name,
3132 ScopedVMInitArgs* vm_args) {
3133 char *buffer = ::getenv(name);
3134
3135 // Don't check this environment variable if user has special privileges
3136 // (e.g. unix su command).
3137 if (buffer == nullptr || os::have_special_privileges()) {
3138 return JNI_OK;
3139 }
3140
3141 if ((buffer = os::strdup(buffer)) == nullptr) {
3142 return JNI_ENOMEM;
3143 }
3144
3145 jio_fprintf(defaultStream::error_stream(),
3146 "Picked up %s: %s\n", name, buffer);
3147
3148 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3149
3150 os::free(buffer);
3151 return retcode;
3152 }
3153
3154 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3155 // read file into buffer
3156 int fd = ::open(file_name, O_RDONLY);
3157 if (fd < 0) {
3158 jio_fprintf(defaultStream::error_stream(),
3159 "Could not open options file '%s'\n",
3160 file_name);
3161 return JNI_ERR;
3162 }
3163
3164 struct stat stbuf;
3165 int retcode = os::stat(file_name, &stbuf);
3166 if (retcode != 0) {
3167 jio_fprintf(defaultStream::error_stream(),
3168 "Could not stat options file '%s'\n",
3169 file_name);
3170 ::close(fd);
3171 return JNI_ERR;
3172 }
3173
3174 if (stbuf.st_size == 0) {
3175 // tell caller there is no option data and that is ok
3176 ::close(fd);
3177 return JNI_OK;
3178 }
3179
3180 // '+ 1' for null termination even with max bytes
3181 size_t bytes_alloc = stbuf.st_size + 1;
3182
3183 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3184 if (nullptr == buf) {
3185 jio_fprintf(defaultStream::error_stream(),
3186 "Could not allocate read buffer for options file parse\n");
3187 ::close(fd);
3188 return JNI_ENOMEM;
3189 }
3190
3191 memset(buf, 0, bytes_alloc);
3192
3193 // Fill buffer
3194 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3195 ::close(fd);
3196 if (bytes_read < 0) {
3197 FREE_C_HEAP_ARRAY(char, buf);
3198 jio_fprintf(defaultStream::error_stream(),
3199 "Could not read options file '%s'\n", file_name);
3200 return JNI_ERR;
3201 }
3202
3203 if (bytes_read == 0) {
3204 // tell caller there is no option data and that is ok
3205 FREE_C_HEAP_ARRAY(char, buf);
3206 return JNI_OK;
3207 }
3208
3209 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3210
3211 FREE_C_HEAP_ARRAY(char, buf);
3212 return retcode;
3213 }
3214
3215 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3216 // Construct option array
3217 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3218
3219 // some pointers to help with parsing
3220 char *buffer_end = buffer + buf_len;
3221 char *opt_hd = buffer;
3222 char *wrt = buffer;
3223 char *rd = buffer;
3224
3225 // parse all options
3226 while (rd < buffer_end) {
3227 // skip leading white space from the input string
3228 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3229 rd++;
3230 }
3231
3232 if (rd >= buffer_end) {
3233 break;
3234 }
3235
3236 // Remember this is where we found the head of the token.
3237 opt_hd = wrt;
3238
3239 // Tokens are strings of non white space characters separated
3240 // by one or more white spaces.
3241 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3242 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3243 int quote = *rd; // matching quote to look for
3244 rd++; // don't copy open quote
3245 while (rd < buffer_end && *rd != quote) {
3246 // include everything (even spaces)
3247 // up until the close quote
3248 *wrt++ = *rd++; // copy to option string
3249 }
3250
3251 if (rd < buffer_end) {
3252 rd++; // don't copy close quote
3253 } else {
3254 // did not see closing quote
3255 jio_fprintf(defaultStream::error_stream(),
3256 "Unmatched quote in %s\n", name);
3257 return JNI_ERR;
3258 }
3259 } else {
3260 *wrt++ = *rd++; // copy to option string
3261 }
3262 }
3263
3264 // steal a white space character and set it to null
3265 *wrt++ = '\0';
3266 // We now have a complete token
3267
3268 JavaVMOption option;
3269 option.optionString = opt_hd;
3270 option.extraInfo = nullptr;
3271
3272 options.append(option); // Fill in option
3273
3274 rd++; // Advance to next character
3275 }
3276
3277 // Fill out JavaVMInitArgs structure.
3278 return vm_args->set_args(&options);
3279 }
3280
3281 #ifndef PRODUCT
3282 // Determine whether LogVMOutput should be implicitly turned on.
3283 static bool use_vm_log() {
3284 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3285 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3286 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3287 PrintAssembly || TraceDeoptimization ||
3288 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3289 return true;
3290 }
3291
3292 #ifdef COMPILER1
3293 if (PrintC1Statistics) {
3294 return true;
3295 }
3296 #endif // COMPILER1
3297
3298 #ifdef COMPILER2
3299 if (PrintOptoAssembly || PrintOptoStatistics) {
3300 return true;
3301 }
3302 #endif // COMPILER2
3303
3304 return false;
3305 }
3306
3307 #endif // PRODUCT
3308
3309 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3310 for (int index = 0; index < args->nOptions; index++) {
3311 const JavaVMOption* option = args->options + index;
3312 const char* tail;
3313 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3314 return true;
3315 }
3316 }
3317 return false;
3318 }
3319
3320 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3321 const char* vm_options_file,
3322 const int vm_options_file_pos,
3323 ScopedVMInitArgs* vm_options_file_args,
3324 ScopedVMInitArgs* args_out) {
3325 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3326 if (code != JNI_OK) {
3327 return code;
3328 }
3329
3330 if (vm_options_file_args->get()->nOptions < 1) {
3331 return JNI_OK;
3332 }
3333
3334 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3335 jio_fprintf(defaultStream::error_stream(),
3336 "A VM options file may not refer to a VM options file. "
3337 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3338 "options file '%s' in options container '%s' is an error.\n",
3339 vm_options_file_args->vm_options_file_arg(),
3340 vm_options_file_args->container_name());
3341 return JNI_EINVAL;
3342 }
3343
3344 return args_out->insert(args, vm_options_file_args->get(),
3345 vm_options_file_pos);
3346 }
3347
3348 // Expand -XX:VMOptionsFile found in args_in as needed.
3349 // mod_args and args_out parameters may return values as needed.
3350 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3351 ScopedVMInitArgs* mod_args,
3352 JavaVMInitArgs** args_out) {
3353 jint code = match_special_option_and_act(args_in, mod_args);
3354 if (code != JNI_OK) {
3355 return code;
3356 }
3357
3358 if (mod_args->is_set()) {
3359 // args_in contains -XX:VMOptionsFile and mod_args contains the
3360 // original options from args_in along with the options expanded
3361 // from the VMOptionsFile. Return a short-hand to the caller.
3362 *args_out = mod_args->get();
3363 } else {
3364 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3365 }
3366 return JNI_OK;
3367 }
3368
3369 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3370 ScopedVMInitArgs* args_out) {
3371 // Remaining part of option string
3372 const char* tail;
3373 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3374
3375 for (int index = 0; index < args->nOptions; index++) {
3376 const JavaVMOption* option = args->options + index;
3377 if (match_option(option, "-XX:Flags=", &tail)) {
3378 Arguments::set_jvm_flags_file(tail);
3379 continue;
3380 }
3381 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3382 if (vm_options_file_args.found_vm_options_file_arg()) {
3383 jio_fprintf(defaultStream::error_stream(),
3384 "The option '%s' is already specified in the options "
3385 "container '%s' so the specification of '%s' in the "
3386 "same options container is an error.\n",
3387 vm_options_file_args.vm_options_file_arg(),
3388 vm_options_file_args.container_name(),
3389 option->optionString);
3390 return JNI_EINVAL;
3391 }
3392 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3393 // If there's a VMOptionsFile, parse that
3394 jint code = insert_vm_options_file(args, tail, index,
3395 &vm_options_file_args, args_out);
3396 if (code != JNI_OK) {
3397 return code;
3398 }
3399 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3400 if (args_out->is_set()) {
3401 // The VMOptions file inserted some options so switch 'args'
3402 // to the new set of options, and continue processing which
3403 // preserves "last option wins" semantics.
3404 args = args_out->get();
3405 // The first option from the VMOptionsFile replaces the
3406 // current option. So we back track to process the
3407 // replacement option.
3408 index--;
3409 }
3410 continue;
3411 }
3412 if (match_option(option, "-XX:+PrintVMOptions")) {
3413 PrintVMOptions = true;
3414 continue;
3415 }
3416 if (match_option(option, "-XX:-PrintVMOptions")) {
3417 PrintVMOptions = false;
3418 continue;
3419 }
3420 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3421 IgnoreUnrecognizedVMOptions = true;
3422 continue;
3423 }
3424 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3425 IgnoreUnrecognizedVMOptions = false;
3426 continue;
3427 }
3428 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3429 JVMFlag::printFlags(tty, false);
3430 vm_exit(0);
3431 }
3432
3433 #ifndef PRODUCT
3434 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3435 JVMFlag::printFlags(tty, true);
3436 vm_exit(0);
3437 }
3438 #endif
3439 }
3440 return JNI_OK;
3441 }
3442
3443 static void print_options(const JavaVMInitArgs *args) {
3444 const char* tail;
3445 for (int index = 0; index < args->nOptions; index++) {
3446 const JavaVMOption *option = args->options + index;
3447 if (match_option(option, "-XX:", &tail)) {
3448 logOption(tail);
3449 }
3450 }
3451 }
3452
3453 bool Arguments::handle_deprecated_print_gc_flags() {
3454 if (PrintGC) {
3455 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3456 }
3457 if (PrintGCDetails) {
3458 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3459 }
3460
3461 if (_legacyGCLogging.lastFlag == 2) {
3462 // -Xloggc was used to specify a filename
3463 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3464
3465 LogTarget(Error, logging) target;
3466 LogStream errstream(target);
3467 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3468 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3469 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3470 }
3471 return true;
3472 }
3473
3474 static void apply_debugger_ergo() {
3475 #ifdef ASSERT
3476 if (ReplayCompiles) {
3477 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3478 }
3479
3480 if (UseDebuggerErgo) {
3481 // Turn on sub-flags
3482 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3483 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3484 }
3485
3486 if (UseDebuggerErgo2) {
3487 // Debugging with limited number of CPUs
3488 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3489 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3490 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3491 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3492 }
3493 #endif // ASSERT
3494 }
3495
3496 // Parse entry point called from JNI_CreateJavaVM
3497
3498 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3499 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3500 JVMFlag::check_all_flag_declarations();
3501
3502 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3503 const char* hotspotrc = ".hotspotrc";
3504 bool settings_file_specified = false;
3505 bool needs_hotspotrc_warning = false;
3506 ScopedVMInitArgs initial_vm_options_args("");
3507 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3508 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3509 ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'");
3510
3511 // Pointers to current working set of containers
3512 JavaVMInitArgs* cur_cmd_args;
3513 JavaVMInitArgs* cur_vm_options_args;
3514 JavaVMInitArgs* cur_java_options_args;
3515 JavaVMInitArgs* cur_java_tool_options_args;
3516 JavaVMInitArgs* cur_jdk_aot_vm_options_args;
3517
3518 // Containers for modified/expanded options
3519 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3520 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3521 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3522 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3523 ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'");
3524
3525 GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args;
3526
3527 jint code =
3528 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3529 if (code != JNI_OK) {
3530 return code;
3531 }
3532
3533 // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM.
3534 // This is an undocumented feature.
3535 code = parse_java_options_environment_variable(&initial_java_options_args);
3536 if (code != JNI_OK) {
3537 return code;
3538 }
3539
3540 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3541 char *vmoptions = ClassLoader::lookup_vm_options();
3542 if (vmoptions != nullptr) {
3543 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3544 FREE_C_HEAP_ARRAY(char, vmoptions);
3545 if (code != JNI_OK) {
3546 return code;
3547 }
3548 }
3549
3550 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3551 &mod_java_tool_options_args,
3552 &cur_java_tool_options_args);
3553 if (code != JNI_OK) {
3554 return code;
3555 }
3556
3557 code = expand_vm_options_as_needed(initial_cmd_args,
3558 &mod_cmd_args,
3559 &cur_cmd_args);
3560 if (code != JNI_OK) {
3561 return code;
3562 }
3563
3564 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3565 &mod_java_options_args,
3566 &cur_java_options_args);
3567 if (code != JNI_OK) {
3568 return code;
3569 }
3570
3571 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3572 &mod_vm_options_args,
3573 &cur_vm_options_args);
3574 if (code != JNI_OK) {
3575 return code;
3576 }
3577
3578 const char* flags_file = Arguments::get_jvm_flags_file();
3579 settings_file_specified = (flags_file != nullptr);
3580
3581 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags.
3582 if (settings_file_specified) {
3583 if (!process_settings_file(flags_file, true,
3584 IgnoreUnrecognizedVMOptions)) {
3585 return JNI_EINVAL;
3586 }
3587 } else {
3588 #ifdef ASSERT
3589 // Parse default .hotspotrc settings file
3590 if (!process_settings_file(".hotspotrc", false,
3591 IgnoreUnrecognizedVMOptions)) {
3592 return JNI_EINVAL;
3593 }
3594 #else
3595 struct stat buf;
3596 if (os::stat(hotspotrc, &buf) == 0) {
3597 needs_hotspotrc_warning = true;
3598 }
3599 #endif
3600 }
3601
3602 // The settings in the args are applied in this order to the the JVM global flags.
3603 // For historical reasons, the order is DIFFERENT than the scanning order of
3604 // the above expand_vm_options_as_needed() calls.
3605 all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE});
3606 all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR});
3607 all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE});
3608 all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR});
3609
3610 // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all
3611 // the options that have been gathered above.
3612 code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args);
3613 if (code != JNI_OK) {
3614 return code;
3615 }
3616 code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(),
3617 &mod_jdk_aot_vm_options_args,
3618 &cur_jdk_aot_vm_options_args);
3619 if (code != JNI_OK) {
3620 return code;
3621 }
3622
3623 for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) {
3624 JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index;
3625 const char* optionString = option->optionString;
3626 if (strstr(optionString, "-XX:AOTMode=") == optionString &&
3627 strcmp(optionString, "-XX:AOTMode=create") != 0) {
3628 jio_fprintf(defaultStream::error_stream(),
3629 "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString);
3630 return JNI_ERR;
3631 }
3632 }
3633
3634 all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR});
3635
3636 if (IgnoreUnrecognizedVMOptions) {
3637 // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of
3638 // the JDK so it shouldn't have bad options.
3639 cur_cmd_args->ignoreUnrecognized = true;
3640 cur_java_tool_options_args->ignoreUnrecognized = true;
3641 cur_java_options_args->ignoreUnrecognized = true;
3642 cur_jdk_aot_vm_options_args->ignoreUnrecognized = true;
3643 }
3644
3645 if (PrintVMOptions) {
3646 // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed.
3647 print_options(cur_java_tool_options_args);
3648 print_options(cur_cmd_args);
3649 print_options(cur_java_options_args);
3650 print_options(cur_jdk_aot_vm_options_args);
3651 }
3652
3653 // Apply the settings in these args to the JVM global flags.
3654 jint result = parse_vm_init_args(&all_args);
3655
3656 if (result != JNI_OK) {
3657 return result;
3658 }
3659
3660 // Delay warning until here so that we've had a chance to process
3661 // the -XX:-PrintWarnings flag
3662 if (needs_hotspotrc_warning) {
3663 warning("%s file is present but has been ignored. "
3664 "Run with -XX:Flags=%s to load the file.",
3665 hotspotrc, hotspotrc);
3666 }
3667
3668 if (needs_module_property_warning) {
3669 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3670 " names that are reserved for internal use.");
3671 }
3672
3673 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3674 UNSUPPORTED_OPTION(UseLargePages);
3675 #endif
3676
3677 #if defined(AIX)
3678 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3679 #endif
3680
3681 #ifndef PRODUCT
3682 if (TraceBytecodesAt != 0) {
3683 TraceBytecodes = true;
3684 }
3685 #endif // PRODUCT
3686
3687 if (ScavengeRootsInCode == 0) {
3688 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3689 warning("Forcing ScavengeRootsInCode non-zero");
3690 }
3691 ScavengeRootsInCode = 1;
3692 }
3693
3694 if (!handle_deprecated_print_gc_flags()) {
3695 return JNI_EINVAL;
3696 }
3697
3698 // Set object alignment values.
3699 set_object_alignment();
3700
3701 #if !INCLUDE_CDS
3702 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3703 jio_fprintf(defaultStream::error_stream(),
3704 "Shared spaces are not supported in this VM\n");
3705 return JNI_ERR;
3706 }
3707 if (DumpLoadedClassList != nullptr) {
3708 jio_fprintf(defaultStream::error_stream(),
3709 "DumpLoadedClassList is not supported in this VM\n");
3710 return JNI_ERR;
3711 }
3712 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3713 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) {
3714 warning("Shared spaces are not supported in this VM");
3715 UseSharedSpaces = false;
3716 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3717 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot));
3718 }
3719 no_shared_spaces("CDS Disabled");
3720 #endif // INCLUDE_CDS
3721
3722 // Verify NMT arguments
3723 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3724 if (lvl == NMT_unknown) {
3725 jio_fprintf(defaultStream::error_stream(),
3726 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3727 return JNI_ERR;
3728 }
3729 if (PrintNMTStatistics && lvl == NMT_off) {
3730 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3731 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3732 }
3733
3734 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3735 if (trace_dependencies && VerifyDependencies) {
3736 warning("dependency logging results may be inflated by VerifyDependencies");
3737 }
3738
3739 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3740 log_is_enabled(Info, class, load, cause);
3741 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3742 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3743 }
3744
3745 apply_debugger_ergo();
3746
3747 // The VMThread needs to stop now and then to execute these debug options.
3748 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3749 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3750 }
3751
3752 if (log_is_enabled(Info, arguments)) {
3753 LogStream st(Log(arguments)::info());
3754 Arguments::print_on(&st);
3755 }
3756
3757 return JNI_OK;
3758 }
3759
3760 void Arguments::set_compact_headers_flags() {
3761 #ifdef _LP64
3762 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3763 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3764 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3765 }
3766 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3767 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3768 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3769 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3770
3771 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3772 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3773 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3774 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3775 } else {
3776 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3777 }
3778 }
3779 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3780 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3781 }
3782 #endif
3783 }
3784
3785 jint Arguments::apply_ergo() {
3786 // Set flags based on ergonomics.
3787 jint result = set_ergonomics_flags();
3788 if (result != JNI_OK) return result;
3789
3790 // Set heap size based on available physical memory
3791 set_heap_size();
3792
3793 GCConfig::arguments()->initialize();
3794
3795 set_compact_headers_flags();
3796
3797 if (UseCompressedClassPointers) {
3798 CompressedKlassPointers::pre_initialize();
3799 }
3800
3801 CDSConfig::ergo_initialize();
3802
3803 // Initialize Metaspace flags and alignments
3804 Metaspace::ergo_initialize();
3805
3806 if (!StringDedup::ergo_initialize()) {
3807 return JNI_EINVAL;
3808 }
3809
3810 // Set compiler flags after GC is selected and GC specific
3811 // flags (LoopStripMiningIter) are set.
3812 CompilerConfig::ergo_initialize();
3813
3814 // Set bytecode rewriting flags
3815 set_bytecode_flags();
3816
3817 // Set flags if aggressive optimization flags are enabled
3818 jint code = set_aggressive_opts_flags();
3819 if (code != JNI_OK) {
3820 return code;
3821 }
3822
3823 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3824 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3825 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3826 warning("UseSecondarySupersTable is not supported");
3827 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3828 }
3829 if (!UseSecondarySupersTable) {
3830 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3831 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3832 }
3833
3834 #ifdef ZERO
3835 // Clear flags not supported on zero.
3836 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3837 #endif // ZERO
3838
3839 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3840 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3841 DebugNonSafepoints = true;
3842 }
3843
3844 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3845 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3846 }
3847
3848 // Treat the odd case where local verification is enabled but remote
3849 // verification is not as if both were enabled.
3850 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3851 log_info(verification)("Turning on remote verification because local verification is on");
3852 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3853 }
3854
3855 #ifndef PRODUCT
3856 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3857 if (use_vm_log()) {
3858 LogVMOutput = true;
3859 }
3860 }
3861 #endif // PRODUCT
3862
3863 if (PrintCommandLineFlags) {
3864 JVMFlag::printSetFlags(tty);
3865 }
3866
3867 #if COMPILER2_OR_JVMCI
3868 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3869 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3870 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3871 }
3872 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3873
3874 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3875 if (!EnableVectorReboxing) {
3876 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3877 } else {
3878 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3879 }
3880 }
3881 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3882 }
3883 #endif // COMPILER2_OR_JVMCI
3884
3885 #ifdef COMPILER2
3886 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
3887 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
3888 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
3889 }
3890 #endif // COMPILER2
3891
3892 if (log_is_enabled(Info, init)) {
3893 if (FLAG_IS_DEFAULT(ProfileVMLocks)) {
3894 FLAG_SET_DEFAULT(ProfileVMLocks, true);
3895 }
3896 if (UsePerfData && !log_is_enabled(Info, perf, class, link)) {
3897 // automatically enable -Xlog:perf+class+link
3898 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(perf, class, link));
3899 }
3900 // Don't turn on ProfileVMCalls and ProfileRuntimeCalls by default.
3901 } else {
3902 if (!FLAG_IS_DEFAULT(ProfileVMLocks) && ProfileVMLocks) {
3903 warning("Disabling ProfileVMLocks since logging is turned off.");
3904 FLAG_SET_DEFAULT(ProfileVMLocks, false);
3905 }
3906 if (!FLAG_IS_DEFAULT(ProfileVMCalls) && ProfileVMCalls) {
3907 warning("Disabling ProfileVMCalls since logging is turned off.");
3908 FLAG_SET_DEFAULT(ProfileVMCalls, false);
3909 }
3910 if (!FLAG_IS_DEFAULT(ProfileRuntimeCalls) && ProfileRuntimeCalls) {
3911 warning("Disabling ProfileRuntimeCalls since logging is turned off.");
3912 FLAG_SET_DEFAULT(ProfileRuntimeCalls, false);
3913 }
3914 if (log_is_enabled(Info, perf, class, link)) {
3915 warning("Disabling -Xlog:perf+class+link since logging is turned off.");
3916 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
3917 assert(!log_is_enabled(Info, perf, class, link), "sanity");
3918 }
3919 }
3920 if (FLAG_IS_DEFAULT(PerfDataMemorySize)) {
3921 if (ProfileVMLocks || ProfileVMCalls || ProfileRuntimeCalls) {
3922 FLAG_SET_DEFAULT(PerfDataMemorySize, 128*K); // reserve more space for extra perf counters
3923 }
3924 }
3925
3926 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3927 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3928 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3929 }
3930 }
3931 return JNI_OK;
3932 }
3933
3934 jint Arguments::adjust_after_os() {
3935 if (UseNUMA) {
3936 if (UseParallelGC) {
3937 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3938 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3939 }
3940 }
3941 }
3942 return JNI_OK;
3943 }
3944
3945 int Arguments::PropertyList_count(SystemProperty* pl) {
3946 int count = 0;
3947 while(pl != nullptr) {
3948 count++;
3949 pl = pl->next();
3950 }
3951 return count;
3952 }
3953
3954 // Return the number of readable properties.
3955 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3956 int count = 0;
3957 while(pl != nullptr) {
3958 if (pl->readable()) {
3959 count++;
3960 }
3961 pl = pl->next();
3962 }
3963 return count;
3964 }
3965
3966 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3967 assert(key != nullptr, "just checking");
3968 SystemProperty* prop;
3969 for (prop = pl; prop != nullptr; prop = prop->next()) {
3970 if (strcmp(key, prop->key()) == 0) return prop->value();
3971 }
3972 return nullptr;
3973 }
3974
3975 // Return the value of the requested property provided that it is a readable property.
3976 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3977 assert(key != nullptr, "just checking");
3978 SystemProperty* prop;
3979 // Return the property value if the keys match and the property is not internal or
3980 // it's the special internal property "jdk.boot.class.path.append".
3981 for (prop = pl; prop != nullptr; prop = prop->next()) {
3982 if (strcmp(key, prop->key()) == 0) {
3983 if (!prop->internal()) {
3984 return prop->value();
3985 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3986 return prop->value();
3987 } else {
3988 // Property is internal and not jdk.boot.class.path.append so return null.
3989 return nullptr;
3990 }
3991 }
3992 }
3993 return nullptr;
3994 }
3995
3996 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3997 SystemProperty* p = *plist;
3998 if (p == nullptr) {
3999 *plist = new_p;
4000 } else {
4001 while (p->next() != nullptr) {
4002 p = p->next();
4003 }
4004 p->set_next(new_p);
4005 }
4006 }
4007
4008 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4009 bool writeable, bool internal) {
4010 if (plist == nullptr)
4011 return;
4012
4013 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4014 PropertyList_add(plist, new_p);
4015 }
4016
4017 void Arguments::PropertyList_add(SystemProperty *element) {
4018 PropertyList_add(&_system_properties, element);
4019 }
4020
4021 // This add maintains unique property key in the list.
4022 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4023 PropertyAppendable append, PropertyWriteable writeable,
4024 PropertyInternal internal) {
4025 if (plist == nullptr)
4026 return;
4027
4028 // If property key exists and is writeable, then update with new value.
4029 // Trying to update a non-writeable property is silently ignored.
4030 SystemProperty* prop;
4031 for (prop = *plist; prop != nullptr; prop = prop->next()) {
4032 if (strcmp(k, prop->key()) == 0) {
4033 if (append == AppendProperty) {
4034 prop->append_writeable_value(v);
4035 } else {
4036 prop->set_writeable_value(v);
4037 }
4038 return;
4039 }
4040 }
4041
4042 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4043 }
4044
4045 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4046 // Returns true if all of the source pointed by src has been copied over to
4047 // the destination buffer pointed by buf. Otherwise, returns false.
4048 // Notes:
4049 // 1. If the length (buflen) of the destination buffer excluding the
4050 // null terminator character is not long enough for holding the expanded
4051 // pid characters, it also returns false instead of returning the partially
4052 // expanded one.
4053 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4054 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4055 char* buf, size_t buflen) {
4056 const char* p = src;
4057 char* b = buf;
4058 const char* src_end = &src[srclen];
4059 char* buf_end = &buf[buflen - 1];
4060
4061 while (p < src_end && b < buf_end) {
4062 if (*p == '%') {
4063 switch (*(++p)) {
4064 case '%': // "%%" ==> "%"
4065 *b++ = *p++;
4066 break;
4067 case 'p': { // "%p" ==> current process id
4068 // buf_end points to the character before the last character so
4069 // that we could write '\0' to the end of the buffer.
4070 size_t buf_sz = buf_end - b + 1;
4071 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4072
4073 // if jio_snprintf fails or the buffer is not long enough to hold
4074 // the expanded pid, returns false.
4075 if (ret < 0 || ret >= (int)buf_sz) {
4076 return false;
4077 } else {
4078 b += ret;
4079 assert(*b == '\0', "fail in copy_expand_pid");
4080 if (p == src_end && b == buf_end + 1) {
4081 // reach the end of the buffer.
4082 return true;
4083 }
4084 }
4085 p++;
4086 break;
4087 }
4088 default :
4089 *b++ = '%';
4090 }
4091 } else {
4092 *b++ = *p++;
4093 }
4094 }
4095 *b = '\0';
4096 return (p == src_end); // return false if not all of the source was copied
4097 }