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/gc_globals.hpp"
35 #include "gc/shared/gcArguments.hpp"
36 #include "gc/shared/gcConfig.hpp"
37 #include "gc/shared/genArguments.hpp"
38 #include "gc/shared/stringdedup/stringDedup.hpp"
39 #include "gc/shared/tlab_globals.hpp"
40 #include "jvm.h"
41 #include "logging/log.hpp"
42 #include "logging/logConfiguration.hpp"
43 #include "logging/logStream.hpp"
44 #include "logging/logTag.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "nmt/nmtCommon.hpp"
47 #include "oops/compressedKlass.hpp"
48 #include "oops/instanceKlass.hpp"
49 #include "oops/objLayout.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "prims/jvmtiAgentList.hpp"
52 #include "prims/jvmtiExport.hpp"
53 #include "runtime/arguments.hpp"
54 #include "runtime/flags/jvmFlag.hpp"
55 #include "runtime/flags/jvmFlagAccess.hpp"
56 #include "runtime/flags/jvmFlagLimit.hpp"
57 #include "runtime/globals_extension.hpp"
58 #include "runtime/java.hpp"
59 #include "runtime/os.hpp"
60 #include "runtime/safepoint.hpp"
61 #include "runtime/safepointMechanism.hpp"
62 #include "runtime/synchronizer.hpp"
63 #include "runtime/vm_version.hpp"
64 #include "services/management.hpp"
65 #include "utilities/align.hpp"
66 #include "utilities/checkedCast.hpp"
67 #include "utilities/debug.hpp"
68 #include "utilities/defaultStream.hpp"
69 #include "utilities/macros.hpp"
70 #include "utilities/parseInteger.hpp"
71 #include "utilities/powerOfTwo.hpp"
72 #include "utilities/stringUtils.hpp"
73 #include "utilities/systemMemoryBarrier.hpp"
74 #if INCLUDE_JFR
75 #include "jfr/jfr.hpp"
76 #endif
77
78 #include <limits>
79
80 static const char _default_java_launcher[] = "generic";
81
82 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
83
84 char* Arguments::_jvm_flags_file = nullptr;
85 char** Arguments::_jvm_flags_array = nullptr;
86 int Arguments::_num_jvm_flags = 0;
87 char** Arguments::_jvm_args_array = nullptr;
88 int Arguments::_num_jvm_args = 0;
89 unsigned int Arguments::_addmods_count = 0;
90 #if INCLUDE_JVMCI
91 bool Arguments::_jvmci_module_added = false;
92 #endif
93 char* Arguments::_java_command = nullptr;
94 SystemProperty* Arguments::_system_properties = nullptr;
95 size_t Arguments::_conservative_max_heap_alignment = 0;
96 Arguments::Mode Arguments::_mode = _mixed;
97 const char* Arguments::_java_vendor_url_bug = nullptr;
98 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
99 bool Arguments::_executing_unit_tests = false;
100
101 // These parameters are reset in method parse_vm_init_args()
102 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
103 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
104 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
105 bool Arguments::_ClipInlining = ClipInlining;
106 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
107
108 bool Arguments::_enable_preview = false;
109 bool Arguments::_has_jdwp_agent = false;
110
111 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
112
113 // These are not set by the JDK's built-in launchers, but they can be set by
114 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
115 // JavaVMOption in jni.h.
116 abort_hook_t Arguments::_abort_hook = nullptr;
117 exit_hook_t Arguments::_exit_hook = nullptr;
118 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
119
120
121 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
122 SystemProperty *Arguments::_java_library_path = nullptr;
123 SystemProperty *Arguments::_java_home = nullptr;
124 SystemProperty *Arguments::_java_class_path = nullptr;
125 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
126 SystemProperty *Arguments::_vm_info = nullptr;
127
128 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
129 PathString *Arguments::_boot_class_path = nullptr;
130 bool Arguments::_has_jimage = false;
131
132 char* Arguments::_ext_dirs = nullptr;
133
134 // True if -Xshare:auto option was specified.
135 static bool xshare_auto_cmd_line = false;
136
137 // True if -Xint/-Xmixed/-Xcomp were specified
138 static bool mode_flag_cmd_line = false;
139
140 struct VMInitArgsGroup {
141 const JavaVMInitArgs* _args;
142 JVMFlagOrigin _origin;
143 };
144
145 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
146 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
147 if (new_value == nullptr) {
148 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
149 return false;
150 }
151 if (_value != nullptr) {
152 FreeHeap(_value);
153 }
154 _value = new_value;
155 strcpy(_value, value);
156 return true;
157 }
158
159 void PathString::append_value(const char *value) {
160 char *sp;
161 size_t len = 0;
162 if (value != nullptr) {
163 len = strlen(value);
164 if (_value != nullptr) {
165 len += strlen(_value);
166 }
167 sp = AllocateHeap(len+2, mtArguments);
168 assert(sp != nullptr, "Unable to allocate space for new append path value");
169 if (sp != nullptr) {
170 if (_value != nullptr) {
171 strcpy(sp, _value);
172 strcat(sp, os::path_separator());
173 strcat(sp, value);
174 FreeHeap(_value);
175 } else {
176 strcpy(sp, value);
177 }
178 _value = sp;
179 }
180 }
181 }
182
183 PathString::PathString(const char* value) {
184 if (value == nullptr) {
185 _value = nullptr;
186 } else {
187 _value = AllocateHeap(strlen(value)+1, mtArguments);
188 strcpy(_value, value);
189 }
190 }
191
192 PathString::~PathString() {
193 if (_value != nullptr) {
194 FreeHeap(_value);
195 _value = nullptr;
196 }
197 }
198
199 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
200 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
201 size_t len = strlen(module_name) + 1;
202 _module_name = AllocateHeap(len, mtInternal);
203 strncpy(_module_name, module_name, len); // copy the trailing null
204 _path = new PathString(path);
205 }
206
207 ModulePatchPath::~ModulePatchPath() {
208 if (_module_name != nullptr) {
209 FreeHeap(_module_name);
210 _module_name = nullptr;
211 }
212 if (_path != nullptr) {
213 delete _path;
214 _path = nullptr;
215 }
216 }
217
218 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
219 if (key == nullptr) {
220 _key = nullptr;
221 } else {
222 _key = AllocateHeap(strlen(key)+1, mtArguments);
223 strcpy(_key, key);
224 }
225 _next = nullptr;
226 _internal = internal;
227 _writeable = writeable;
228 }
229
230 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
231 // part of the option string.
232 static bool match_option(const JavaVMOption *option, const char* name,
233 const char** tail) {
234 size_t len = strlen(name);
235 if (strncmp(option->optionString, name, len) == 0) {
236 *tail = option->optionString + len;
237 return true;
238 } else {
239 return false;
240 }
241 }
242
243 // Check if 'option' matches 'name'. No "tail" is allowed.
244 static bool match_option(const JavaVMOption *option, const char* name) {
245 const char* tail = nullptr;
246 bool result = match_option(option, name, &tail);
247 if (tail != nullptr && *tail == '\0') {
248 return result;
249 } else {
250 return false;
251 }
252 }
253
254 // Return true if any of the strings in null-terminated array 'names' matches.
255 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
256 // the option must match exactly.
257 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
258 bool tail_allowed) {
259 for (/* empty */; *names != nullptr; ++names) {
260 if (match_option(option, *names, tail)) {
261 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
262 return true;
263 }
264 }
265 }
266 return false;
267 }
268
269 #if INCLUDE_JFR
270 static bool _has_jfr_option = false; // is using JFR
271
272 // return true on failure
273 static bool match_jfr_option(const JavaVMOption** option) {
274 assert((*option)->optionString != nullptr, "invariant");
275 char* tail = nullptr;
276 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
277 _has_jfr_option = true;
278 return Jfr::on_start_flight_recording_option(option, tail);
279 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
280 _has_jfr_option = true;
281 return Jfr::on_flight_recorder_option(option, tail);
282 }
283 return false;
284 }
285
286 bool Arguments::has_jfr_option() {
287 return _has_jfr_option;
288 }
289 #endif
290
291 static void logOption(const char* opt) {
292 if (PrintVMOptions) {
293 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
294 }
295 }
296
297 bool needs_module_property_warning = false;
298
299 #define MODULE_PROPERTY_PREFIX "jdk.module."
300 #define MODULE_PROPERTY_PREFIX_LEN 11
301 #define ADDEXPORTS "addexports"
302 #define ADDEXPORTS_LEN 10
303 #define ADDREADS "addreads"
304 #define ADDREADS_LEN 8
305 #define ADDOPENS "addopens"
306 #define ADDOPENS_LEN 8
307 #define PATCH "patch"
308 #define PATCH_LEN 5
309 #define ADDMODS "addmods"
310 #define ADDMODS_LEN 7
311 #define LIMITMODS "limitmods"
312 #define LIMITMODS_LEN 9
313 #define PATH "path"
314 #define PATH_LEN 4
315 #define UPGRADE_PATH "upgrade.path"
316 #define UPGRADE_PATH_LEN 12
317 #define ENABLE_NATIVE_ACCESS "enable.native.access"
318 #define ENABLE_NATIVE_ACCESS_LEN 20
319 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
320 #define ILLEGAL_NATIVE_ACCESS_LEN 21
321
322 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
323 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
324 return ((strncmp(option, property, len) == 0) &&
325 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
326 }
327
328 // Return true if property starts with "jdk.module." and its ensuing chars match
329 // any of the reserved module properties.
330 // property should be passed without the leading "-D".
331 bool Arguments::is_internal_module_property(const char* property) {
332 return internal_module_property_helper(property, false);
333 }
334
335 // Returns true if property is one of those recognized by is_internal_module_property() but
336 // is not supported by CDS archived full module graph.
337 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
338 return internal_module_property_helper(property, true);
339 }
340
341 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
342 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
343 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
344 if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
345 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
346 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
347 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN)) {
348 return true;
349 }
350
351 if (!check_for_cds) {
352 // CDS notes: these properties are supported by CDS archived full module graph.
353 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
354 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
355 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
356 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
357 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
358 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
359 return true;
360 }
361 }
362 }
363 return false;
364 }
365
366 // Process java launcher properties.
367 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
368 // See if sun.java.launcher is defined.
369 // Must do this before setting up other system properties,
370 // as some of them may depend on launcher type.
371 for (int index = 0; index < args->nOptions; index++) {
372 const JavaVMOption* option = args->options + index;
373 const char* tail;
374
375 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
376 process_java_launcher_argument(tail, option->extraInfo);
377 continue;
378 }
379 if (match_option(option, "-XX:+ExecutingUnitTests")) {
380 _executing_unit_tests = true;
381 continue;
382 }
383 }
384 }
385
386 // Initialize system properties key and value.
387 void Arguments::init_system_properties() {
388
389 // Set up _boot_class_path which is not a property but
390 // relies heavily on argument processing and the jdk.boot.class.path.append
391 // property. It is used to store the underlying boot class path.
392 _boot_class_path = new PathString(nullptr);
393
394 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
395 "Java Virtual Machine Specification", false));
396 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
397 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
398 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
399
400 // Initialize the vm.info now, but it will need updating after argument parsing.
401 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
402
403 // Following are JVMTI agent writable properties.
404 // Properties values are set to nullptr and they are
405 // os specific they are initialized in os::init_system_properties_values().
406 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
407 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
408 _java_home = new SystemProperty("java.home", nullptr, true);
409 _java_class_path = new SystemProperty("java.class.path", "", true);
410 // jdk.boot.class.path.append is a non-writeable, internal property.
411 // It can only be set by either:
412 // - -Xbootclasspath/a:
413 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
414 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
415
416 // Add to System Property list.
417 PropertyList_add(&_system_properties, _sun_boot_library_path);
418 PropertyList_add(&_system_properties, _java_library_path);
419 PropertyList_add(&_system_properties, _java_home);
420 PropertyList_add(&_system_properties, _java_class_path);
421 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
422 PropertyList_add(&_system_properties, _vm_info);
423
424 // Set OS specific system properties values
425 os::init_system_properties_values();
426 }
427
428 // Update/Initialize System properties after JDK version number is known
429 void Arguments::init_version_specific_system_properties() {
430 enum { bufsz = 16 };
431 char buffer[bufsz];
432 const char* spec_vendor = "Oracle Corporation";
433 uint32_t spec_version = JDK_Version::current().major_version();
434
435 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
436
437 PropertyList_add(&_system_properties,
438 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
439 PropertyList_add(&_system_properties,
440 new SystemProperty("java.vm.specification.version", buffer, false));
441 PropertyList_add(&_system_properties,
442 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
443 }
444
445 /*
446 * -XX argument processing:
447 *
448 * -XX arguments are defined in several places, such as:
449 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
450 * -XX arguments are parsed in parse_argument().
451 * -XX argument bounds checking is done in check_vm_args_consistency().
452 *
453 * Over time -XX arguments may change. There are mechanisms to handle common cases:
454 *
455 * ALIASED: An option that is simply another name for another option. This is often
456 * part of the process of deprecating a flag, but not all aliases need
457 * to be deprecated.
458 *
459 * Create an alias for an option by adding the old and new option names to the
460 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
461 *
462 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
463 * support may be removed in the future. Both regular and aliased options may be
464 * deprecated.
465 *
466 * Add a deprecation warning for an option (or alias) by adding an entry in the
467 * "special_jvm_flags" table and setting the "deprecated_in" field.
468 * Often an option "deprecated" in one major release will
469 * be made "obsolete" in the next. In this case the entry should also have its
470 * "obsolete_in" field set.
471 *
472 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
473 * on the command line. A warning is printed to let the user know that option might not
474 * be accepted in the future.
475 *
476 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
477 * table and setting the "obsolete_in" field.
478 *
479 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
480 * to the current JDK version. The system will flatly refuse to admit the existence of
481 * the flag. This allows a flag to die automatically over JDK releases.
482 *
483 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
484 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
485 * - Newly obsolete or expired deprecated options should have their global variable
486 * definitions removed (from globals.hpp, etc) and related implementations removed.
487 *
488 * Recommended approach for removing options:
489 *
490 * To remove options commonly used by customers (e.g. product -XX options), use
491 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
492 *
493 * To remove internal options (e.g. diagnostic, experimental, develop options), use
494 * a 2-step model adding major release numbers to the obsolete and expire columns.
495 *
496 * To change the name of an option, use the alias table as well as a 2-step
497 * model adding major release numbers to the deprecate and expire columns.
498 * Think twice about aliasing commonly used customer options.
499 *
500 * There are times when it is appropriate to leave a future release number as undefined.
501 *
502 * Tests: Aliases should be tested in VMAliasOptions.java.
503 * Deprecated options should be tested in VMDeprecatedOptions.java.
504 */
505
506 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
507 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
508 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
509 // the command-line as usual, but will issue a warning.
510 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
511 // the command-line, while issuing a warning and ignoring the flag value.
512 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
513 // existence of the flag.
514 //
515 // MANUAL CLEANUP ON JDK VERSION UPDATES:
516 // This table ensures that the handling of options will update automatically when the JDK
517 // version is incremented, but the source code needs to be cleanup up manually:
518 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
519 // variable should be removed, as well as users of the variable.
520 // - As "deprecated" options age into "obsolete" options, move the entry into the
521 // "Obsolete Flags" section of the table.
522 // - All expired options should be removed from the table.
523 static SpecialFlag const special_jvm_flags[] = {
524 // -------------- Deprecated Flags --------------
525 // --- Non-alias flags - sorted by obsolete_in then expired_in:
526 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
527 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
528 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
529 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
530 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
531 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
532 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
533 #ifdef _LP64
534 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::undefined() },
535 #endif
536 { "ParallelRefProcEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
537 { "ParallelRefProcBalancingEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
538 { "PSChunkLargeArrays", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
539 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
540 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
541
542 // -------------- Obsolete Flags - sorted by expired_in --------------
543
544 #ifdef LINUX
545 { "UseOprofile", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) },
546 #endif
547 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
548 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::undefined() },
549 { "ZMarkStackSpaceLimit", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
550 { "G1UpdateBufferSize", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
551 #if defined(AARCH64)
552 { "NearCpool", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
553 #endif
554
555 { "AdaptiveSizeMajorGCDecayTimeScale", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
556 { "AdaptiveSizePolicyInitializingSteps", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
557 { "AdaptiveSizePolicyOutputInterval", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
558 { "AdaptiveSizeThroughPutPolicy", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
559 { "AdaptiveTimeWeight", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
560 { "PausePadding", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
561 { "SurvivorPadding", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
562 { "TenuredGenerationSizeIncrement", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
563 { "TenuredGenerationSizeSupplement", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
564 { "TenuredGenerationSizeSupplementDecay", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
565 { "UseAdaptiveGenerationSizePolicyAtMajorCollection", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
566 { "UseAdaptiveGenerationSizePolicyAtMinorCollection", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
567 { "UseAdaptiveSizeDecayMajorGCCost", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
568 { "UseAdaptiveSizePolicyFootprintGoal", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
569 { "UseAdaptiveSizePolicyWithSystemGC", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
570 { "UsePSAdaptiveSurvivorSizePolicy", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
571
572 { "PretenureSizeThreshold", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
573 { "HeapMaximumCompactionInterval",JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
574
575 #ifdef ASSERT
576 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
577 #endif
578
579 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
580 // These entries will generate build errors. Their purpose is to test the macros.
581 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
582 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
583 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
584 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
585 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
586 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
587 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
588 #endif
589
590 { nullptr, JDK_Version(0), JDK_Version(0) }
591 };
592
593 // Flags that are aliases for other flags.
594 typedef struct {
595 const char* alias_name;
596 const char* real_name;
597 } AliasedFlag;
598
599 static AliasedFlag const aliased_jvm_flags[] = {
600 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
601 { nullptr, nullptr}
602 };
603
604 // Return true if "v" is less than "other", where "other" may be "undefined".
605 static bool version_less_than(JDK_Version v, JDK_Version other) {
606 assert(!v.is_undefined(), "must be defined");
607 if (!other.is_undefined() && v.compare(other) >= 0) {
608 return false;
609 } else {
610 return true;
611 }
612 }
613
614 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
615 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
616 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
617 flag = special_jvm_flags[i];
618 return true;
619 }
620 }
621 return false;
622 }
623
624 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
625 assert(version != nullptr, "Must provide a version buffer");
626 SpecialFlag flag;
627 if (lookup_special_flag(flag_name, flag)) {
628 if (!flag.obsolete_in.is_undefined()) {
629 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
630 *version = flag.obsolete_in;
631 // This flag may have been marked for obsoletion in this version, but we may not
632 // have actually removed it yet. Rather than ignoring it as soon as we reach
633 // this version we allow some time for the removal to happen. So if the flag
634 // still actually exists we process it as normal, but issue an adjusted warning.
635 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
636 if (real_flag != nullptr) {
637 char version_str[256];
638 version->to_string(version_str, sizeof(version_str));
639 warning("Temporarily processing option %s; support is scheduled for removal in %s",
640 flag_name, version_str);
641 return false;
642 }
643 return true;
644 }
645 }
646 }
647 return false;
648 }
649
650 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
651 assert(version != nullptr, "Must provide a version buffer");
652 SpecialFlag flag;
653 if (lookup_special_flag(flag_name, flag)) {
654 if (!flag.deprecated_in.is_undefined()) {
655 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
656 version_less_than(JDK_Version::current(), flag.expired_in)) {
657 *version = flag.deprecated_in;
658 return 1;
659 } else {
660 return -1;
661 }
662 }
663 }
664 return 0;
665 }
666
667 const char* Arguments::real_flag_name(const char *flag_name) {
668 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
669 const AliasedFlag& flag_status = aliased_jvm_flags[i];
670 if (strcmp(flag_status.alias_name, flag_name) == 0) {
671 return flag_status.real_name;
672 }
673 }
674 return flag_name;
675 }
676
677 #ifdef ASSERT
678 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
679 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
680 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
681 return true;
682 }
683 }
684 return false;
685 }
686
687 // Verifies the correctness of the entries in the special_jvm_flags table.
688 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
689 // version being earlier than the deprecation version, then a warning is issued
690 // and verification fails - by returning false. If it is detected that the table
691 // is out of date, with respect to the current version, then ideally a warning is
692 // issued but verification does not fail. This allows the VM to operate when the
693 // version is first updated, without needing to update all the impacted flags at
694 // the same time. In practice we can't issue the warning immediately when the version
695 // is updated as it occurs for every test and some tests are not prepared to handle
696 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
697 // if the check_globals flag is true, and in addition allow a grace period and only
698 // check for stale flags when we hit build 25 (which is far enough into the 6 month
699 // release cycle that all flag updates should have been processed, whilst still
700 // leaving time to make the change before RDP2).
701 // We use a gtest to call this, passing true, so that we can detect stale flags before
702 // the end of the release cycle.
703
704 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
705
706 bool Arguments::verify_special_jvm_flags(bool check_globals) {
707 bool success = true;
708 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
709 const SpecialFlag& flag = special_jvm_flags[i];
710 if (lookup_special_flag(flag.name, i)) {
711 warning("Duplicate special flag declaration \"%s\"", flag.name);
712 success = false;
713 }
714 if (flag.deprecated_in.is_undefined() &&
715 flag.obsolete_in.is_undefined()) {
716 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
717 success = false;
718 }
719
720 if (!flag.deprecated_in.is_undefined()) {
721 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
722 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
723 success = false;
724 }
725
726 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
727 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
728 success = false;
729 }
730 }
731
732 if (!flag.obsolete_in.is_undefined()) {
733 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
734 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
735 success = false;
736 }
737
738 // if flag has become obsolete it should not have a "globals" flag defined anymore.
739 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
740 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
741 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
742 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
743 success = false;
744 }
745 }
746
747 } else if (!flag.expired_in.is_undefined()) {
748 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
749 success = false;
750 }
751
752 if (!flag.expired_in.is_undefined()) {
753 // if flag has become expired it should not have a "globals" flag defined anymore.
754 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
755 !version_less_than(JDK_Version::current(), flag.expired_in)) {
756 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
757 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
758 success = false;
759 }
760 }
761 }
762 }
763 return success;
764 }
765 #endif
766
767 bool Arguments::atojulong(const char *s, julong* result) {
768 return parse_integer(s, result);
769 }
770
771 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
772 if (size < min_size) return arg_too_small;
773 if (size > max_size) return arg_too_big;
774 return arg_in_range;
775 }
776
777 // Describe an argument out of range error
778 void Arguments::describe_range_error(ArgsRange errcode) {
779 switch(errcode) {
780 case arg_too_big:
781 jio_fprintf(defaultStream::error_stream(),
782 "The specified size exceeds the maximum "
783 "representable size.\n");
784 break;
785 case arg_too_small:
786 case arg_unreadable:
787 case arg_in_range:
788 // do nothing for now
789 break;
790 default:
791 ShouldNotReachHere();
792 }
793 }
794
795 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
796 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
797 return true;
798 } else {
799 return false;
800 }
801 }
802
803 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
804 // strtod allows leading whitespace, but our flag format does not.
805 if (*value == '\0' || isspace((unsigned char) *value)) {
806 return false;
807 }
808 char* end;
809 errno = 0;
810 double v = strtod(value, &end);
811 if ((errno != 0) || (*end != 0)) {
812 return false;
813 }
814 if (g_isnan(v) || !g_isfinite(v)) {
815 // Currently we cannot handle these special values.
816 return false;
817 }
818
819 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
820 return true;
821 }
822 return false;
823 }
824
825 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
826 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
827
828 if (flag->is_int()) {
829 int v;
830 if (parse_integer(value, &v)) {
831 result = JVMFlagAccess::set_int(flag, &v, origin);
832 }
833 } else if (flag->is_uint()) {
834 uint v;
835 if (parse_integer(value, &v)) {
836 result = JVMFlagAccess::set_uint(flag, &v, origin);
837 }
838 } else if (flag->is_intx()) {
839 intx v;
840 if (parse_integer(value, &v)) {
841 result = JVMFlagAccess::set_intx(flag, &v, origin);
842 }
843 } else if (flag->is_uintx()) {
844 uintx v;
845 if (parse_integer(value, &v)) {
846 result = JVMFlagAccess::set_uintx(flag, &v, origin);
847 }
848 } else if (flag->is_uint64_t()) {
849 uint64_t v;
850 if (parse_integer(value, &v)) {
851 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
852 }
853 } else if (flag->is_size_t()) {
854 size_t v;
855 if (parse_integer(value, &v)) {
856 result = JVMFlagAccess::set_size_t(flag, &v, origin);
857 }
858 }
859
860 return result == JVMFlag::SUCCESS;
861 }
862
863 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
864 if (value[0] == '\0') {
865 value = nullptr;
866 }
867 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
868 // Contract: JVMFlag always returns a pointer that needs freeing.
869 FREE_C_HEAP_ARRAY(char, value);
870 return true;
871 }
872
873 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
874 const char* old_value = "";
875 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
876 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
877 size_t new_len = strlen(new_value);
878 const char* value;
879 char* free_this_too = nullptr;
880 if (old_len == 0) {
881 value = new_value;
882 } else if (new_len == 0) {
883 value = old_value;
884 } else {
885 size_t length = old_len + 1 + new_len + 1;
886 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
887 // each new setting adds another LINE to the switch:
888 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
889 value = buf;
890 free_this_too = buf;
891 }
892 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
893 // JVMFlag always returns a pointer that needs freeing.
894 FREE_C_HEAP_ARRAY(char, value);
895 // JVMFlag made its own copy, so I must delete my own temp. buffer.
896 FREE_C_HEAP_ARRAY(char, free_this_too);
897 return true;
898 }
899
900 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
901 const char* real_name = real_flag_name(arg);
902 JDK_Version since = JDK_Version();
903 switch (is_deprecated_flag(arg, &since)) {
904 case -1: {
905 // Obsolete or expired, so don't process normally,
906 // but allow for an obsolete flag we're still
907 // temporarily allowing.
908 if (!is_obsolete_flag(arg, &since)) {
909 return real_name;
910 }
911 // Note if we're not considered obsolete then we can't be expired either
912 // as obsoletion must come first.
913 return nullptr;
914 }
915 case 0:
916 return real_name;
917 case 1: {
918 char version[256];
919 since.to_string(version, sizeof(version));
920 if (real_name != arg) {
921 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
922 arg, version, real_name);
923 } else {
924 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
925 arg, version);
926 }
927 return real_name;
928 }
929 }
930 ShouldNotReachHere();
931 return nullptr;
932 }
933
934 #define BUFLEN 255
935
936 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
937 char name_copied[BUFLEN+1];
938 if (name[name_length] != 0) {
939 if (name_length > BUFLEN) {
940 return nullptr;
941 } else {
942 strncpy(name_copied, name, name_length);
943 name_copied[name_length] = '\0';
944 name = name_copied;
945 }
946 }
947
948 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
949 if (real_name == nullptr) {
950 return nullptr;
951 }
952 JVMFlag* flag = JVMFlag::find_flag(real_name);
953 return flag;
954 }
955
956 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
957 bool is_bool = false;
958 bool bool_val = false;
959 char c = *arg;
960 if (c == '+' || c == '-') {
961 is_bool = true;
962 bool_val = (c == '+');
963 arg++;
964 }
965
966 const char* name = arg;
967 while (true) {
968 c = *arg;
969 if (isalnum(c) || (c == '_')) {
970 ++arg;
971 } else {
972 break;
973 }
974 }
975
976 size_t name_len = size_t(arg - name);
977 if (name_len == 0) {
978 return false;
979 }
980
981 JVMFlag* flag = find_jvm_flag(name, name_len);
982 if (flag == nullptr) {
983 return false;
984 }
985
986 if (is_bool) {
987 if (*arg != 0) {
988 // Error -- extra characters such as -XX:+BoolFlag=123
989 return false;
990 }
991 return set_bool_flag(flag, bool_val, origin);
992 }
993
994 if (arg[0] == '=') {
995 const char* value = arg + 1;
996 if (flag->is_ccstr()) {
997 if (flag->ccstr_accumulates()) {
998 return append_to_string_flag(flag, value, origin);
999 } else {
1000 return set_string_flag(flag, value, origin);
1001 }
1002 } else if (flag->is_double()) {
1003 return set_fp_numeric_flag(flag, value, origin);
1004 } else {
1005 return set_numeric_flag(flag, value, origin);
1006 }
1007 }
1008
1009 if (arg[0] == ':' && arg[1] == '=') {
1010 // -XX:Foo:=xxx will reset the string flag to the given value.
1011 const char* value = arg + 2;
1012 return set_string_flag(flag, value, origin);
1013 }
1014
1015 return false;
1016 }
1017
1018 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1019 assert(bldarray != nullptr, "illegal argument");
1020
1021 if (arg == nullptr) {
1022 return;
1023 }
1024
1025 int new_count = *count + 1;
1026
1027 // expand the array and add arg to the last element
1028 if (*bldarray == nullptr) {
1029 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1030 } else {
1031 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1032 }
1033 (*bldarray)[*count] = os::strdup_check_oom(arg);
1034 *count = new_count;
1035 }
1036
1037 void Arguments::build_jvm_args(const char* arg) {
1038 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1039 }
1040
1041 void Arguments::build_jvm_flags(const char* arg) {
1042 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1043 }
1044
1045 // utility function to return a string that concatenates all
1046 // strings in a given char** array
1047 const char* Arguments::build_resource_string(char** args, int count) {
1048 if (args == nullptr || count == 0) {
1049 return nullptr;
1050 }
1051 size_t length = 0;
1052 for (int i = 0; i < count; i++) {
1053 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1054 }
1055 char* s = NEW_RESOURCE_ARRAY(char, length);
1056 char* dst = s;
1057 for (int j = 0; j < count; j++) {
1058 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1059 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1060 dst += offset;
1061 length -= offset;
1062 }
1063 return (const char*) s;
1064 }
1065
1066 void Arguments::print_on(outputStream* st) {
1067 st->print_cr("VM Arguments:");
1068 if (num_jvm_flags() > 0) {
1069 st->print("jvm_flags: "); print_jvm_flags_on(st);
1070 st->cr();
1071 }
1072 if (num_jvm_args() > 0) {
1073 st->print("jvm_args: "); print_jvm_args_on(st);
1074 st->cr();
1075 }
1076 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1077 if (_java_class_path != nullptr) {
1078 char* path = _java_class_path->value();
1079 size_t len = strlen(path);
1080 st->print("java_class_path (initial): ");
1081 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1082 if (len == 0) {
1083 st->print_raw_cr("<not set>");
1084 } else {
1085 st->print_raw_cr(path, len);
1086 }
1087 }
1088 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1089 }
1090
1091 void Arguments::print_summary_on(outputStream* st) {
1092 // Print the command line. Environment variables that are helpful for
1093 // reproducing the problem are written later in the hs_err file.
1094 // flags are from setting file
1095 if (num_jvm_flags() > 0) {
1096 st->print_raw("Settings File: ");
1097 print_jvm_flags_on(st);
1098 st->cr();
1099 }
1100 // args are the command line and environment variable arguments.
1101 st->print_raw("Command Line: ");
1102 if (num_jvm_args() > 0) {
1103 print_jvm_args_on(st);
1104 }
1105 // this is the classfile and any arguments to the java program
1106 if (java_command() != nullptr) {
1107 st->print("%s", java_command());
1108 }
1109 st->cr();
1110 }
1111
1112 void Arguments::print_jvm_flags_on(outputStream* st) {
1113 if (_num_jvm_flags > 0) {
1114 for (int i=0; i < _num_jvm_flags; i++) {
1115 st->print("%s ", _jvm_flags_array[i]);
1116 }
1117 }
1118 }
1119
1120 void Arguments::print_jvm_args_on(outputStream* st) {
1121 if (_num_jvm_args > 0) {
1122 for (int i=0; i < _num_jvm_args; i++) {
1123 st->print("%s ", _jvm_args_array[i]);
1124 }
1125 }
1126 }
1127
1128 bool Arguments::process_argument(const char* arg,
1129 jboolean ignore_unrecognized,
1130 JVMFlagOrigin origin) {
1131 JDK_Version since = JDK_Version();
1132
1133 if (parse_argument(arg, origin)) {
1134 return true;
1135 }
1136
1137 // Determine if the flag has '+', '-', or '=' characters.
1138 bool has_plus_minus = (*arg == '+' || *arg == '-');
1139 const char* const argname = has_plus_minus ? arg + 1 : arg;
1140
1141 size_t arg_len;
1142 const char* equal_sign = strchr(argname, '=');
1143 if (equal_sign == nullptr) {
1144 arg_len = strlen(argname);
1145 } else {
1146 arg_len = equal_sign - argname;
1147 }
1148
1149 // Only make the obsolete check for valid arguments.
1150 if (arg_len <= BUFLEN) {
1151 // Construct a string which consists only of the argument name without '+', '-', or '='.
1152 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1153 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1154 if (is_obsolete_flag(stripped_argname, &since)) {
1155 char version[256];
1156 since.to_string(version, sizeof(version));
1157 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1158 return true;
1159 }
1160 }
1161
1162 // For locked flags, report a custom error message if available.
1163 // Otherwise, report the standard unrecognized VM option.
1164 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1165 if (found_flag != nullptr) {
1166 char locked_message_buf[BUFLEN];
1167 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1168 if (strlen(locked_message_buf) != 0) {
1169 #ifdef PRODUCT
1170 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1171 if (ignore_unrecognized && mismatched) {
1172 return true;
1173 }
1174 #endif
1175 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1176 }
1177 if (found_flag->is_bool() && !has_plus_minus) {
1178 jio_fprintf(defaultStream::error_stream(),
1179 "Missing +/- setting for VM option '%s'\n", argname);
1180 } else if (!found_flag->is_bool() && has_plus_minus) {
1181 jio_fprintf(defaultStream::error_stream(),
1182 "Unexpected +/- setting in VM option '%s'\n", argname);
1183 } else {
1184 jio_fprintf(defaultStream::error_stream(),
1185 "Improperly specified VM option '%s'\n", argname);
1186 }
1187 } else {
1188 if (ignore_unrecognized) {
1189 return true;
1190 }
1191 jio_fprintf(defaultStream::error_stream(),
1192 "Unrecognized VM option '%s'\n", argname);
1193 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1194 if (fuzzy_matched != nullptr) {
1195 jio_fprintf(defaultStream::error_stream(),
1196 "Did you mean '%s%s%s'?\n",
1197 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1198 fuzzy_matched->name(),
1199 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1200 }
1201 }
1202
1203 // allow for commandline "commenting out" options like -XX:#+Verbose
1204 return arg[0] == '#';
1205 }
1206
1207 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1208 FILE* stream = os::fopen(file_name, "rb");
1209 if (stream == nullptr) {
1210 if (should_exist) {
1211 jio_fprintf(defaultStream::error_stream(),
1212 "Could not open settings file %s\n", file_name);
1213 return false;
1214 } else {
1215 return true;
1216 }
1217 }
1218
1219 char token[1024];
1220 int pos = 0;
1221
1222 bool in_white_space = true;
1223 bool in_comment = false;
1224 bool in_quote = false;
1225 int quote_c = 0;
1226 bool result = true;
1227
1228 int c = getc(stream);
1229 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1230 if (in_white_space) {
1231 if (in_comment) {
1232 if (c == '\n') in_comment = false;
1233 } else {
1234 if (c == '#') in_comment = true;
1235 else if (!isspace((unsigned char) c)) {
1236 in_white_space = false;
1237 token[pos++] = checked_cast<char>(c);
1238 }
1239 }
1240 } else {
1241 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1242 // token ends at newline, or at unquoted whitespace
1243 // this allows a way to include spaces in string-valued options
1244 token[pos] = '\0';
1245 logOption(token);
1246 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1247 build_jvm_flags(token);
1248 pos = 0;
1249 in_white_space = true;
1250 in_quote = false;
1251 } else if (!in_quote && (c == '\'' || c == '"')) {
1252 in_quote = true;
1253 quote_c = c;
1254 } else if (in_quote && (c == quote_c)) {
1255 in_quote = false;
1256 } else {
1257 token[pos++] = checked_cast<char>(c);
1258 }
1259 }
1260 c = getc(stream);
1261 }
1262 if (pos > 0) {
1263 token[pos] = '\0';
1264 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1265 build_jvm_flags(token);
1266 }
1267 fclose(stream);
1268 return result;
1269 }
1270
1271 //=============================================================================================================
1272 // Parsing of properties (-D)
1273
1274 const char* Arguments::get_property(const char* key) {
1275 return PropertyList_get_value(system_properties(), key);
1276 }
1277
1278 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1279 const char* eq = strchr(prop, '=');
1280 const char* key;
1281 const char* value = "";
1282
1283 if (eq == nullptr) {
1284 // property doesn't have a value, thus use passed string
1285 key = prop;
1286 } else {
1287 // property have a value, thus extract it and save to the
1288 // allocated string
1289 size_t key_len = eq - prop;
1290 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1291
1292 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1293 key = tmp_key;
1294
1295 value = &prop[key_len + 1];
1296 }
1297
1298 if (internal == ExternalProperty) {
1299 CDSConfig::check_incompatible_property(key, value);
1300 }
1301
1302 if (strcmp(key, "java.compiler") == 0) {
1303 // we no longer support java.compiler system property, log a warning and let it get
1304 // passed to Java, like any other system property
1305 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1306 // for applications using NONE or empty value, log a more informative message
1307 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1308 } else {
1309 warning("The java.compiler system property is obsolete and no longer supported.");
1310 }
1311 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1312 // append is true, writable is true, internal is false
1313 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1314 WriteableProperty, ExternalProperty);
1315 } else {
1316 if (strcmp(key, "sun.java.command") == 0) {
1317 char *old_java_command = _java_command;
1318 _java_command = os::strdup_check_oom(value, mtArguments);
1319 if (old_java_command != nullptr) {
1320 os::free(old_java_command);
1321 }
1322 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1323 // If this property is set on the command line then its value will be
1324 // displayed in VM error logs as the URL at which to submit such logs.
1325 // Normally the URL displayed in error logs is different from the value
1326 // of this system property, so a different property should have been
1327 // used here, but we leave this as-is in case someone depends upon it.
1328 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1329 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1330 // its value without going through the property list or making a Java call.
1331 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1332 if (old_java_vendor_url_bug != nullptr) {
1333 os::free((void *)old_java_vendor_url_bug);
1334 }
1335 }
1336
1337 // Create new property and add at the end of the list
1338 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1339 }
1340
1341 if (key != prop) {
1342 // SystemProperty copy passed value, thus free previously allocated
1343 // memory
1344 FreeHeap((void *)key);
1345 }
1346
1347 return true;
1348 }
1349
1350 //===========================================================================================================
1351 // Setting int/mixed/comp mode flags
1352
1353 void Arguments::set_mode_flags(Mode mode) {
1354 // Set up default values for all flags.
1355 // If you add a flag to any of the branches below,
1356 // add a default value for it here.
1357 _mode = mode;
1358
1359 // Ensure Agent_OnLoad has the correct initial values.
1360 // This may not be the final mode; mode may change later in onload phase.
1361 PropertyList_unique_add(&_system_properties, "java.vm.info",
1362 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1363
1364 UseInterpreter = true;
1365 UseCompiler = true;
1366 UseLoopCounter = true;
1367
1368 // Default values may be platform/compiler dependent -
1369 // use the saved values
1370 ClipInlining = Arguments::_ClipInlining;
1371 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1372 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1373 BackgroundCompilation = Arguments::_BackgroundCompilation;
1374
1375 // Change from defaults based on mode
1376 switch (mode) {
1377 default:
1378 ShouldNotReachHere();
1379 break;
1380 case _int:
1381 UseCompiler = false;
1382 UseLoopCounter = false;
1383 AlwaysCompileLoopMethods = false;
1384 UseOnStackReplacement = false;
1385 break;
1386 case _mixed:
1387 // same as default
1388 break;
1389 case _comp:
1390 UseInterpreter = false;
1391 BackgroundCompilation = false;
1392 ClipInlining = false;
1393 break;
1394 }
1395 }
1396
1397 // Conflict: required to use shared spaces (-Xshare:on), but
1398 // incompatible command line options were chosen.
1399 void Arguments::no_shared_spaces(const char* message) {
1400 if (RequireSharedSpaces) {
1401 aot_log_error(aot)("%s is incompatible with other specified options.",
1402 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1403 if (CDSConfig::new_aot_flags_used()) {
1404 vm_exit_during_initialization("Unable to use AOT cache", message);
1405 } else {
1406 vm_exit_during_initialization("Unable to use shared archive", message);
1407 }
1408 } else {
1409 if (CDSConfig::new_aot_flags_used()) {
1410 log_warning(aot)("Unable to use AOT cache: %s", message);
1411 } else {
1412 aot_log_info(aot)("Unable to use shared archive: %s", message);
1413 }
1414 UseSharedSpaces = false;
1415 }
1416 }
1417
1418 static void set_object_alignment() {
1419 // Object alignment.
1420 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1421 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1422 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1423 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1424 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1425 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1426
1427 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1428 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1429
1430 // Oop encoding heap max
1431 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1432 }
1433
1434 size_t Arguments::max_heap_for_compressed_oops() {
1435 // Avoid sign flip.
1436 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1437 // We need to fit both the null page and the heap into the memory budget, while
1438 // keeping alignment constraints of the heap. To guarantee the latter, as the
1439 // null page is located before the heap, we pad the null page to the conservative
1440 // maximum alignment that the GC may ever impose upon the heap.
1441 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1442 _conservative_max_heap_alignment);
1443
1444 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1445 NOT_LP64(ShouldNotReachHere(); return 0);
1446 }
1447
1448 void Arguments::set_use_compressed_oops() {
1449 #ifdef _LP64
1450 // MaxHeapSize is not set up properly at this point, but
1451 // the only value that can override MaxHeapSize if we are
1452 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1453 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1454
1455 if (max_heap_size <= max_heap_for_compressed_oops()) {
1456 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1457 FLAG_SET_ERGO(UseCompressedOops, true);
1458 }
1459 } else {
1460 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1461 warning("Max heap size too large for Compressed Oops");
1462 FLAG_SET_DEFAULT(UseCompressedOops, false);
1463 }
1464 }
1465 #endif // _LP64
1466 }
1467
1468 void Arguments::set_conservative_max_heap_alignment() {
1469 // The conservative maximum required alignment for the heap is the maximum of
1470 // the alignments imposed by several sources: any requirements from the heap
1471 // itself and the maximum page size we may run the VM with.
1472 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1473 _conservative_max_heap_alignment = MAX4(heap_alignment,
1474 os::vm_allocation_granularity(),
1475 os::max_page_size(),
1476 GCArguments::compute_heap_alignment());
1477 }
1478
1479 jint Arguments::set_ergonomics_flags() {
1480 GCConfig::initialize();
1481
1482 set_conservative_max_heap_alignment();
1483
1484 #ifdef _LP64
1485 set_use_compressed_oops();
1486
1487 // Also checks that certain machines are slower with compressed oops
1488 // in vm_version initialization code.
1489 #endif // _LP64
1490
1491 return JNI_OK;
1492 }
1493
1494 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1495 // The AggressiveHeap check is a temporary workaround to avoid calling
1496 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1497 // selected. This works because AggressiveHeap implies UseParallelGC
1498 // where we know the ratio will be 1. Once the AggressiveHeap option is
1499 // removed, this can be cleaned up.
1500 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1501 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1502 size_t max_allocatable = os::commit_memory_limit();
1503
1504 return MIN2(limit, max_allocatable / fraction);
1505 }
1506
1507 // Use static initialization to get the default before parsing
1508 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1509
1510 static size_t clamp_by_size_t_max(uint64_t value) {
1511 return (size_t)MIN2(value, (uint64_t)std::numeric_limits<size_t>::max());
1512 }
1513
1514 void Arguments::set_heap_size() {
1515 uint64_t physical_memory;
1516
1517 // Check if the user has configured any limit on the amount of RAM we may use.
1518 bool has_ram_limit = !FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1519 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1520 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1521 !FLAG_IS_DEFAULT(MaxRAM);
1522
1523 if (has_ram_limit) {
1524 if (!FLAG_IS_DEFAULT(MaxRAM)) {
1525 // The user has configured MaxRAM, use that instead of physical memory
1526 // reported by the OS.
1527 physical_memory = MaxRAM;
1528 } else {
1529 // The user has configured a limit, make sure MaxRAM reflects the physical
1530 // memory limit that heap sizing takes into account.
1531 physical_memory = os::physical_memory();
1532 FLAG_SET_ERGO(MaxRAM, physical_memory);
1533 }
1534 } else {
1535 // If the user did not specify any limit, choose the lowest of the available
1536 // physical memory and MaxRAM. MaxRAM is typically set to 128GB on 64-bit
1537 // architecture.
1538 physical_memory = MIN2(os::physical_memory(), MaxRAM);
1539 }
1540
1541 // If the maximum heap size has not been set with -Xmx, then set it as
1542 // fraction of the size of physical memory, respecting the maximum and
1543 // minimum sizes of the heap.
1544 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1545 uint64_t min_memory = (uint64_t)(((double)physical_memory * MinRAMPercentage) / 100);
1546 uint64_t max_memory = (uint64_t)(((double)physical_memory * MaxRAMPercentage) / 100);
1547
1548 const size_t reasonable_min = clamp_by_size_t_max(min_memory);
1549 size_t reasonable_max = clamp_by_size_t_max(max_memory);
1550
1551 if (reasonable_min < MaxHeapSize) {
1552 // Small physical memory, so use a minimum fraction of it for the heap
1553 reasonable_max = reasonable_min;
1554 } else {
1555 // Not-small physical memory, so require a heap at least
1556 // as large as MaxHeapSize
1557 reasonable_max = MAX2(reasonable_max, MaxHeapSize);
1558 }
1559
1560 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1561 // Limit the heap size to ErgoHeapSizeLimit
1562 reasonable_max = MIN2(reasonable_max, ErgoHeapSizeLimit);
1563 }
1564
1565 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1566
1567 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1568 // An initial heap size was specified on the command line,
1569 // so be sure that the maximum size is consistent. Done
1570 // after call to limit_heap_by_allocatable_memory because that
1571 // method might reduce the allocation size.
1572 reasonable_max = MAX2(reasonable_max, InitialHeapSize);
1573 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1574 reasonable_max = MAX2(reasonable_max, MinHeapSize);
1575 }
1576
1577 #ifdef _LP64
1578 if (UseCompressedOops || UseCompressedClassPointers) {
1579 // HeapBaseMinAddress can be greater than default but not less than.
1580 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1581 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1582 // matches compressed oops printing flags
1583 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu "
1584 "(%zuG) which is greater than value given %zu",
1585 DefaultHeapBaseMinAddress,
1586 DefaultHeapBaseMinAddress/G,
1587 HeapBaseMinAddress);
1588 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1589 }
1590 }
1591 }
1592
1593 if (UseCompressedOops) {
1594 size_t heap_end = HeapBaseMinAddress + MaxHeapSize;
1595 size_t max_coop_heap = max_heap_for_compressed_oops();
1596
1597 // Limit the heap size to the maximum possible when using compressed oops
1598 if (heap_end < max_coop_heap) {
1599 // Heap should be above HeapBaseMinAddress to get zero based compressed
1600 // oops but it should be not less than default MaxHeapSize.
1601 max_coop_heap -= HeapBaseMinAddress;
1602 }
1603
1604 // If the user has configured any limit on the amount of RAM we may use,
1605 // then disable compressed oops if the calculated max exceeds max_coop_heap
1606 // and UseCompressedOops was not specified.
1607 if (reasonable_max > max_coop_heap) {
1608 if (FLAG_IS_ERGO(UseCompressedOops) && has_ram_limit) {
1609 aot_log_info(aot)("UseCompressedOops disabled due to "
1610 "max heap %zu > compressed oop heap %zu. "
1611 "Please check the setting of MaxRAMPercentage %5.2f.",
1612 reasonable_max, max_coop_heap, MaxRAMPercentage);
1613 FLAG_SET_ERGO(UseCompressedOops, false);
1614 } else {
1615 reasonable_max = max_coop_heap;
1616 }
1617 }
1618 }
1619 #endif // _LP64
1620
1621 log_trace(gc, heap)(" Maximum heap size %zu", reasonable_max);
1622 FLAG_SET_ERGO(MaxHeapSize, reasonable_max);
1623 }
1624
1625 // If the minimum or initial heap_size have not been set or requested to be set
1626 // ergonomically, set them accordingly.
1627 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1628 size_t reasonable_minimum = clamp_by_size_t_max((uint64_t)OldSize + (uint64_t)NewSize);
1629 reasonable_minimum = MIN2(reasonable_minimum, MaxHeapSize);
1630 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1631
1632 if (InitialHeapSize == 0) {
1633 uint64_t initial_memory = (uint64_t)(((double)physical_memory * InitialRAMPercentage) / 100);
1634 size_t reasonable_initial = clamp_by_size_t_max(initial_memory);
1635 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1636
1637 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, MinHeapSize);
1638 reasonable_initial = MIN2(reasonable_initial, MaxHeapSize);
1639
1640 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1641 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize);
1642 }
1643
1644 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1645 // synchronize with InitialHeapSize to avoid errors with the default value.
1646 if (MinHeapSize == 0) {
1647 FLAG_SET_ERGO(MinHeapSize, MIN2(reasonable_minimum, InitialHeapSize));
1648 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize);
1649 }
1650 }
1651 }
1652
1653 // This option inspects the machine and attempts to set various
1654 // parameters to be optimal for long-running, memory allocation
1655 // intensive jobs. It is intended for machines with large
1656 // amounts of cpu and memory.
1657 jint Arguments::set_aggressive_heap_flags() {
1658 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1659 // VM, but we may not be able to represent the total physical memory
1660 // available (like having 8gb of memory on a box but using a 32bit VM).
1661 // Thus, we need to make sure we're using a julong for intermediate
1662 // calculations.
1663 julong initHeapSize;
1664 physical_memory_size_type phys_mem = os::physical_memory();
1665 julong total_memory = static_cast<julong>(phys_mem);
1666
1667 if (total_memory < (julong) 256 * M) {
1668 jio_fprintf(defaultStream::error_stream(),
1669 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1670 vm_exit(1);
1671 }
1672
1673 // The heap size is half of available memory, or (at most)
1674 // all of possible memory less 160mb (leaving room for the OS
1675 // when using ISM). This is the maximum; because adaptive sizing
1676 // is turned on below, the actual space used may be smaller.
1677
1678 initHeapSize = MIN2(total_memory / (julong) 2,
1679 total_memory - (julong) 160 * M);
1680
1681 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1682
1683 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1684 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1685 return JNI_EINVAL;
1686 }
1687 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1688 return JNI_EINVAL;
1689 }
1690 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1691 return JNI_EINVAL;
1692 }
1693 }
1694 if (FLAG_IS_DEFAULT(NewSize)) {
1695 // Make the young generation 3/8ths of the total heap.
1696 if (FLAG_SET_CMDLINE(NewSize,
1697 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1698 return JNI_EINVAL;
1699 }
1700 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1701 return JNI_EINVAL;
1702 }
1703 }
1704
1705 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1706 FLAG_SET_DEFAULT(UseLargePages, true);
1707 #endif
1708
1709 // Increase some data structure sizes for efficiency
1710 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1711 return JNI_EINVAL;
1712 }
1713 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1714 return JNI_EINVAL;
1715 }
1716
1717 // See the OldPLABSize comment below, but replace 'after promotion'
1718 // with 'after copying'. YoungPLABSize is the size of the survivor
1719 // space per-gc-thread buffers. The default is 4kw.
1720 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1721 return JNI_EINVAL;
1722 }
1723
1724 // OldPLABSize is the size of the buffers in the old gen that
1725 // UseParallelGC uses to promote live data that doesn't fit in the
1726 // survivor spaces. At any given time, there's one for each gc thread.
1727 // The default size is 1kw. These buffers are rarely used, since the
1728 // survivor spaces are usually big enough. For specjbb, however, there
1729 // are occasions when there's lots of live data in the young gen
1730 // and we end up promoting some of it. We don't have a definite
1731 // explanation for why bumping OldPLABSize helps, but the theory
1732 // is that a bigger PLAB results in retaining something like the
1733 // original allocation order after promotion, which improves mutator
1734 // locality. A minor effect may be that larger PLABs reduce the
1735 // number of PLAB allocation events during gc. The value of 8kw
1736 // was arrived at by experimenting with specjbb.
1737 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1738 return JNI_EINVAL;
1739 }
1740
1741 // Enable parallel GC and adaptive generation sizing
1742 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1743 return JNI_EINVAL;
1744 }
1745
1746 // Encourage steady state memory management
1747 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1748 return JNI_EINVAL;
1749 }
1750
1751 return JNI_OK;
1752 }
1753
1754 // This must be called after ergonomics.
1755 void Arguments::set_bytecode_flags() {
1756 if (!RewriteBytecodes) {
1757 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1758 }
1759 }
1760
1761 // Aggressive optimization flags
1762 jint Arguments::set_aggressive_opts_flags() {
1763 #ifdef COMPILER2
1764 if (AggressiveUnboxing) {
1765 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1766 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1767 } else if (!EliminateAutoBox) {
1768 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1769 AggressiveUnboxing = false;
1770 }
1771 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1772 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1773 } else if (!DoEscapeAnalysis) {
1774 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1775 AggressiveUnboxing = false;
1776 }
1777 }
1778 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1779 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1780 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1781 }
1782 // Feed the cache size setting into the JDK
1783 char buffer[1024];
1784 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1785 if (!add_property(buffer)) {
1786 return JNI_ENOMEM;
1787 }
1788 }
1789 #endif
1790
1791 return JNI_OK;
1792 }
1793
1794 //===========================================================================================================
1795
1796 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1797 if (_sun_java_launcher != _default_java_launcher) {
1798 os::free(const_cast<char*>(_sun_java_launcher));
1799 }
1800 _sun_java_launcher = os::strdup_check_oom(launcher);
1801 }
1802
1803 bool Arguments::created_by_java_launcher() {
1804 assert(_sun_java_launcher != nullptr, "property must have value");
1805 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1806 }
1807
1808 bool Arguments::executing_unit_tests() {
1809 return _executing_unit_tests;
1810 }
1811
1812 //===========================================================================================================
1813 // Parsing of main arguments
1814
1815 static unsigned int addreads_count = 0;
1816 static unsigned int addexports_count = 0;
1817 static unsigned int addopens_count = 0;
1818 static unsigned int patch_mod_count = 0;
1819 static unsigned int enable_native_access_count = 0;
1820 static bool patch_mod_javabase = false;
1821
1822 // Check the consistency of vm_init_args
1823 bool Arguments::check_vm_args_consistency() {
1824 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1825 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
1826 return false;
1827 }
1828
1829 // Method for adding checks for flag consistency.
1830 // The intent is to warn the user of all possible conflicts,
1831 // before returning an error.
1832 // Note: Needs platform-dependent factoring.
1833 bool status = true;
1834
1835 if (TLABRefillWasteFraction == 0) {
1836 jio_fprintf(defaultStream::error_stream(),
1837 "TLABRefillWasteFraction should be a denominator, "
1838 "not %zu\n",
1839 TLABRefillWasteFraction);
1840 status = false;
1841 }
1842
1843 status = CompilerConfig::check_args_consistency(status);
1844 #if INCLUDE_JVMCI
1845 if (status && EnableJVMCI) {
1846 // Add the JVMCI module if not using libjvmci or EnableJVMCI
1847 // was explicitly set on the command line or in the jimage.
1848 if ((!UseJVMCINativeLibrary || FLAG_IS_CMDLINE(EnableJVMCI) || FLAG_IS_JIMAGE_RESOURCE(EnableJVMCI)) && ClassLoader::is_module_observable("jdk.internal.vm.ci") && !_jvmci_module_added) {
1849 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1850 return false;
1851 }
1852 }
1853 }
1854 #endif
1855
1856 #if INCLUDE_JFR
1857 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1858 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1859 return false;
1860 }
1861 }
1862 #endif
1863
1864 #ifndef SUPPORT_RESERVED_STACK_AREA
1865 if (StackReservedPages != 0) {
1866 FLAG_SET_CMDLINE(StackReservedPages, 0);
1867 warning("Reserved Stack Area not supported on this platform");
1868 }
1869 #endif
1870
1871 return status;
1872 }
1873
1874 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1875 const char* option_type) {
1876 if (ignore) return false;
1877
1878 const char* spacer = " ";
1879 if (option_type == nullptr) {
1880 option_type = ++spacer; // Set both to the empty string.
1881 }
1882
1883 jio_fprintf(defaultStream::error_stream(),
1884 "Unrecognized %s%soption: %s\n", option_type, spacer,
1885 option->optionString);
1886 return true;
1887 }
1888
1889 static const char* user_assertion_options[] = {
1890 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1891 };
1892
1893 static const char* system_assertion_options[] = {
1894 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1895 };
1896
1897 bool Arguments::parse_uint(const char* value,
1898 uint* uint_arg,
1899 uint min_size) {
1900 uint n;
1901 if (!parse_integer(value, &n)) {
1902 return false;
1903 }
1904 if (n >= min_size) {
1905 *uint_arg = n;
1906 return true;
1907 } else {
1908 return false;
1909 }
1910 }
1911
1912 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1913 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1914 CDSConfig::check_internal_module_property(prop_name, prop_value);
1915 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1916 char* property = AllocateHeap(prop_len, mtArguments);
1917 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1918 if (ret < 0 || ret >= (int)prop_len) {
1919 FreeHeap(property);
1920 return false;
1921 }
1922 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1923 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1924 // that multiple occurrences of the associated flag just causes the existing property value to be
1925 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1926 // to a property after we have finished flag processing.
1927 bool added = add_property(property, WriteableProperty, internal);
1928 FreeHeap(property);
1929 return added;
1930 }
1931
1932 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1933 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1934 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1935 const unsigned int props_count_limit = 1000;
1936 const int max_digits = 3;
1937 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1938
1939 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1940 if (count < props_count_limit) {
1941 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1942 char* property = AllocateHeap(prop_len, mtArguments);
1943 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1944 if (ret < 0 || ret >= (int)prop_len) {
1945 FreeHeap(property);
1946 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1947 return false;
1948 }
1949 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1950 FreeHeap(property);
1951 return added;
1952 }
1953
1954 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1955 return false;
1956 }
1957
1958 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1959 julong* long_arg,
1960 julong min_size,
1961 julong max_size) {
1962 if (!parse_integer(s, long_arg)) return arg_unreadable;
1963 return check_memory_size(*long_arg, min_size, max_size);
1964 }
1965
1966 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) {
1967 // Save default settings for some mode flags
1968 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1969 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1970 Arguments::_ClipInlining = ClipInlining;
1971 Arguments::_BackgroundCompilation = BackgroundCompilation;
1972
1973 // Remember the default value of SharedBaseAddress.
1974 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1975
1976 // Setup flags for mixed which is the default
1977 set_mode_flags(_mixed);
1978
1979 jint result;
1980 for (int i = 0; i < all_args->length(); i++) {
1981 result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin);
1982 if (result != JNI_OK) {
1983 return result;
1984 }
1985 }
1986
1987 // Disable CDS for exploded image
1988 if (!has_jimage()) {
1989 no_shared_spaces("CDS disabled on exploded JDK");
1990 }
1991
1992 // We need to ensure processor and memory resources have been properly
1993 // configured - which may rely on arguments we just processed - before
1994 // doing the final argument processing. Any argument processing that
1995 // needs to know about processor and memory resources must occur after
1996 // this point.
1997
1998 os::init_container_support();
1999
2000 SystemMemoryBarrier::initialize();
2001
2002 // Do final processing now that all arguments have been parsed
2003 result = finalize_vm_init_args();
2004 if (result != JNI_OK) {
2005 return result;
2006 }
2007
2008 return JNI_OK;
2009 }
2010
2011 #if !INCLUDE_JVMTI || INCLUDE_CDS
2012 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2013 // represents a valid JDWP agent. is_path==true denotes that we
2014 // are dealing with -agentpath (case where name is a path), otherwise with
2015 // -agentlib
2016 static bool valid_jdwp_agent(char *name, bool is_path) {
2017 char *_name;
2018 const char *_jdwp = "jdwp";
2019 size_t _len_jdwp, _len_prefix;
2020
2021 if (is_path) {
2022 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2023 return false;
2024 }
2025
2026 _name++; // skip past last path separator
2027 _len_prefix = strlen(JNI_LIB_PREFIX);
2028
2029 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2030 return false;
2031 }
2032
2033 _name += _len_prefix;
2034 _len_jdwp = strlen(_jdwp);
2035
2036 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2037 _name += _len_jdwp;
2038 }
2039 else {
2040 return false;
2041 }
2042
2043 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2044 return false;
2045 }
2046
2047 return true;
2048 }
2049
2050 if (strcmp(name, _jdwp) == 0) {
2051 return true;
2052 }
2053
2054 return false;
2055 }
2056 #endif
2057
2058 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2059 // --patch-module=<module>=<file>(<pathsep><file>)*
2060 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2061 // Find the equal sign between the module name and the path specification
2062 const char* module_equal = strchr(patch_mod_tail, '=');
2063 if (module_equal == nullptr) {
2064 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2065 return JNI_ERR;
2066 } else {
2067 // Pick out the module name
2068 size_t module_len = module_equal - patch_mod_tail;
2069 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2070 if (module_name != nullptr) {
2071 memcpy(module_name, patch_mod_tail, module_len);
2072 *(module_name + module_len) = '\0';
2073 // The path piece begins one past the module_equal sign
2074 add_patch_mod_prefix(module_name, module_equal + 1);
2075 FREE_C_HEAP_ARRAY(char, module_name);
2076 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2077 return JNI_ENOMEM;
2078 }
2079 } else {
2080 return JNI_ENOMEM;
2081 }
2082 }
2083 return JNI_OK;
2084 }
2085
2086 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2087 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2088 // The min and max sizes match the values in globals.hpp, but scaled
2089 // with K. The values have been chosen so that alignment with page
2090 // size doesn't change the max value, which makes the conversions
2091 // back and forth between Xss value and ThreadStackSize value easier.
2092 // The values have also been chosen to fit inside a 32-bit signed type.
2093 const julong min_ThreadStackSize = 0;
2094 const julong max_ThreadStackSize = 1 * M;
2095
2096 // Make sure the above values match the range set in globals.hpp
2097 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2098 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2099 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2100
2101 const julong min_size = min_ThreadStackSize * K;
2102 const julong max_size = max_ThreadStackSize * K;
2103
2104 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2105
2106 julong size = 0;
2107 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2108 if (errcode != arg_in_range) {
2109 bool silent = (option == nullptr); // Allow testing to silence error messages
2110 if (!silent) {
2111 jio_fprintf(defaultStream::error_stream(),
2112 "Invalid thread stack size: %s\n", option->optionString);
2113 describe_range_error(errcode);
2114 }
2115 return JNI_EINVAL;
2116 }
2117
2118 // Internally track ThreadStackSize in units of 1024 bytes.
2119 const julong size_aligned = align_up(size, K);
2120 assert(size <= size_aligned,
2121 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2122 size, size_aligned);
2123
2124 const julong size_in_K = size_aligned / K;
2125 assert(size_in_K < (julong)max_intx,
2126 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2127 size_in_K);
2128
2129 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2130 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2131 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2132 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2133 max_expanded, size_in_K);
2134
2135 *out_ThreadStackSize = (intx)size_in_K;
2136
2137 return JNI_OK;
2138 }
2139
2140 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2141 // For match_option to return remaining or value part of option string
2142 const char* tail;
2143
2144 // iterate over arguments
2145 for (int index = 0; index < args->nOptions; index++) {
2146 bool is_absolute_path = false; // for -agentpath vs -agentlib
2147
2148 const JavaVMOption* option = args->options + index;
2149
2150 if (!match_option(option, "-Djava.class.path", &tail) &&
2151 !match_option(option, "-Dsun.java.command", &tail) &&
2152 !match_option(option, "-Dsun.java.launcher", &tail)) {
2153
2154 // add all jvm options to the jvm_args string. This string
2155 // is used later to set the java.vm.args PerfData string constant.
2156 // the -Djava.class.path and the -Dsun.java.command options are
2157 // omitted from jvm_args string as each have their own PerfData
2158 // string constant object.
2159 build_jvm_args(option->optionString);
2160 }
2161
2162 // -verbose:[class/module/gc/jni]
2163 if (match_option(option, "-verbose", &tail)) {
2164 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2165 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2166 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2167 } else if (!strcmp(tail, ":module")) {
2168 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2169 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2170 } else if (!strcmp(tail, ":gc")) {
2171 if (_legacyGCLogging.lastFlag == 0) {
2172 _legacyGCLogging.lastFlag = 1;
2173 }
2174 } else if (!strcmp(tail, ":jni")) {
2175 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2176 }
2177 // -da / -ea / -disableassertions / -enableassertions
2178 // These accept an optional class/package name separated by a colon, e.g.,
2179 // -da:java.lang.Thread.
2180 } else if (match_option(option, user_assertion_options, &tail, true)) {
2181 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2182 if (*tail == '\0') {
2183 JavaAssertions::setUserClassDefault(enable);
2184 } else {
2185 assert(*tail == ':', "bogus match by match_option()");
2186 JavaAssertions::addOption(tail + 1, enable);
2187 }
2188 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2189 } else if (match_option(option, system_assertion_options, &tail, false)) {
2190 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2191 JavaAssertions::setSystemClassDefault(enable);
2192 // -bootclasspath:
2193 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2194 jio_fprintf(defaultStream::output_stream(),
2195 "-Xbootclasspath is no longer a supported option.\n");
2196 return JNI_EINVAL;
2197 // -bootclasspath/a:
2198 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2199 Arguments::append_sysclasspath(tail);
2200 // -bootclasspath/p:
2201 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2202 jio_fprintf(defaultStream::output_stream(),
2203 "-Xbootclasspath/p is no longer a supported option.\n");
2204 return JNI_EINVAL;
2205 // -Xrun
2206 } else if (match_option(option, "-Xrun", &tail)) {
2207 if (tail != nullptr) {
2208 const char* pos = strchr(tail, ':');
2209 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2210 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2211 jio_snprintf(name, len + 1, "%s", tail);
2212
2213 char *options = nullptr;
2214 if(pos != nullptr) {
2215 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2216 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2217 }
2218 #if !INCLUDE_JVMTI
2219 if (strcmp(name, "jdwp") == 0) {
2220 jio_fprintf(defaultStream::error_stream(),
2221 "Debugging agents are not supported in this VM\n");
2222 return JNI_ERR;
2223 }
2224 #endif // !INCLUDE_JVMTI
2225 JvmtiAgentList::add_xrun(name, options, false);
2226 FREE_C_HEAP_ARRAY(char, name);
2227 FREE_C_HEAP_ARRAY(char, options);
2228 }
2229 } else if (match_option(option, "--add-reads=", &tail)) {
2230 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2231 return JNI_ENOMEM;
2232 }
2233 } else if (match_option(option, "--add-exports=", &tail)) {
2234 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2235 return JNI_ENOMEM;
2236 }
2237 } else if (match_option(option, "--add-opens=", &tail)) {
2238 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2239 return JNI_ENOMEM;
2240 }
2241 } else if (match_option(option, "--add-modules=", &tail)) {
2242 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2243 return JNI_ENOMEM;
2244 }
2245 #if INCLUDE_JVMCI
2246 if (!_jvmci_module_added) {
2247 const char *jvmci_module = strstr(tail, "jdk.internal.vm.ci");
2248 if (jvmci_module != nullptr) {
2249 char before = *(jvmci_module - 1);
2250 char after = *(jvmci_module + strlen("jdk.internal.vm.ci"));
2251 if ((before == '=' || before == ',') && (after == '\0' || after == ',')) {
2252 FLAG_SET_DEFAULT(EnableJVMCI, true);
2253 _jvmci_module_added = true;
2254 }
2255 }
2256 }
2257 #endif
2258 } else if (match_option(option, "--enable-native-access=", &tail)) {
2259 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2260 return JNI_ENOMEM;
2261 }
2262 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2263 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2264 return JNI_ENOMEM;
2265 }
2266 } else if (match_option(option, "--limit-modules=", &tail)) {
2267 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2268 return JNI_ENOMEM;
2269 }
2270 } else if (match_option(option, "--module-path=", &tail)) {
2271 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2272 return JNI_ENOMEM;
2273 }
2274 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2275 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2276 return JNI_ENOMEM;
2277 }
2278 } else if (match_option(option, "--patch-module=", &tail)) {
2279 // --patch-module=<module>=<file>(<pathsep><file>)*
2280 int res = process_patch_mod_option(tail);
2281 if (res != JNI_OK) {
2282 return res;
2283 }
2284 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2285 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2286 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2287 AddProperty, WriteableProperty, InternalProperty);
2288 } else {
2289 jio_fprintf(defaultStream::error_stream(),
2290 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2291 return JNI_ERR;
2292 }
2293 } else if (match_option(option, "--illegal-access=", &tail)) {
2294 char version[256];
2295 JDK_Version::jdk(17).to_string(version, sizeof(version));
2296 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2297 // -agentlib and -agentpath
2298 } else if (match_option(option, "-agentlib:", &tail) ||
2299 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2300 if(tail != nullptr) {
2301 const char* pos = strchr(tail, '=');
2302 char* name;
2303 if (pos == nullptr) {
2304 name = os::strdup_check_oom(tail, mtArguments);
2305 } else {
2306 size_t len = pos - tail;
2307 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2308 memcpy(name, tail, len);
2309 name[len] = '\0';
2310 }
2311
2312 char *options = nullptr;
2313 if(pos != nullptr) {
2314 options = os::strdup_check_oom(pos + 1, mtArguments);
2315 }
2316 #if !INCLUDE_JVMTI
2317 if (valid_jdwp_agent(name, is_absolute_path)) {
2318 jio_fprintf(defaultStream::error_stream(),
2319 "Debugging agents are not supported in this VM\n");
2320 return JNI_ERR;
2321 }
2322 #elif INCLUDE_CDS
2323 if (valid_jdwp_agent(name, is_absolute_path)) {
2324 _has_jdwp_agent = true;
2325 }
2326 #endif // !INCLUDE_JVMTI
2327 JvmtiAgentList::add(name, options, is_absolute_path);
2328 os::free(name);
2329 os::free(options);
2330 }
2331 // -javaagent
2332 } else if (match_option(option, "-javaagent:", &tail)) {
2333 #if !INCLUDE_JVMTI
2334 jio_fprintf(defaultStream::error_stream(),
2335 "Instrumentation agents are not supported in this VM\n");
2336 return JNI_ERR;
2337 #else
2338 if (tail != nullptr) {
2339 size_t length = strlen(tail) + 1;
2340 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2341 jio_snprintf(options, length, "%s", tail);
2342 JvmtiAgentList::add("instrument", options, false);
2343 FREE_C_HEAP_ARRAY(char, options);
2344
2345 // java agents need module java.instrument
2346 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2347 return JNI_ENOMEM;
2348 }
2349 }
2350 #endif // !INCLUDE_JVMTI
2351 // --enable_preview
2352 } else if (match_option(option, "--enable-preview")) {
2353 set_enable_preview();
2354 // -Xnoclassgc
2355 } else if (match_option(option, "-Xnoclassgc")) {
2356 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2357 return JNI_EINVAL;
2358 }
2359 // -Xbatch
2360 } else if (match_option(option, "-Xbatch")) {
2361 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2362 return JNI_EINVAL;
2363 }
2364 // -Xmn for compatibility with other JVM vendors
2365 } else if (match_option(option, "-Xmn", &tail)) {
2366 julong long_initial_young_size = 0;
2367 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2368 if (errcode != arg_in_range) {
2369 jio_fprintf(defaultStream::error_stream(),
2370 "Invalid initial young generation size: %s\n", option->optionString);
2371 describe_range_error(errcode);
2372 return JNI_EINVAL;
2373 }
2374 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2375 return JNI_EINVAL;
2376 }
2377 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2378 return JNI_EINVAL;
2379 }
2380 // -Xms
2381 } else if (match_option(option, "-Xms", &tail)) {
2382 julong size = 0;
2383 // an initial heap size of 0 means automatically determine
2384 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2385 if (errcode != arg_in_range) {
2386 jio_fprintf(defaultStream::error_stream(),
2387 "Invalid initial heap size: %s\n", option->optionString);
2388 describe_range_error(errcode);
2389 return JNI_EINVAL;
2390 }
2391 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2392 return JNI_EINVAL;
2393 }
2394 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2395 return JNI_EINVAL;
2396 }
2397 // -Xmx
2398 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2399 julong long_max_heap_size = 0;
2400 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2401 if (errcode != arg_in_range) {
2402 jio_fprintf(defaultStream::error_stream(),
2403 "Invalid maximum heap size: %s\n", option->optionString);
2404 describe_range_error(errcode);
2405 return JNI_EINVAL;
2406 }
2407 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2408 return JNI_EINVAL;
2409 }
2410 // Xmaxf
2411 } else if (match_option(option, "-Xmaxf", &tail)) {
2412 char* err;
2413 double dmaxf = strtod(tail, &err);
2414 if (*err != '\0' || *tail == '\0') {
2415 jio_fprintf(defaultStream::error_stream(),
2416 "Bad max heap free ratio: %s\n",
2417 option->optionString);
2418 return JNI_EINVAL;
2419 }
2420 if (dmaxf < 0.0 || dmaxf > 1.0) {
2421 jio_fprintf(defaultStream::error_stream(),
2422 "-Xmaxf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2423 option->optionString);
2424 return JNI_EINVAL;
2425 }
2426 const uintx umaxf = (uintx)(dmaxf * 100);
2427 if (MinHeapFreeRatio > umaxf) {
2428 jio_fprintf(defaultStream::error_stream(),
2429 "-Xmaxf value (%s) must be greater than or equal to the implicit -Xminf value (%.2f)\n",
2430 tail, MinHeapFreeRatio / 100.0f);
2431 return JNI_EINVAL;
2432 }
2433 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, umaxf) != JVMFlag::SUCCESS) {
2434 return JNI_EINVAL;
2435 }
2436 // Xminf
2437 } else if (match_option(option, "-Xminf", &tail)) {
2438 char* err;
2439 double dminf = strtod(tail, &err);
2440 if (*err != '\0' || *tail == '\0') {
2441 jio_fprintf(defaultStream::error_stream(),
2442 "Bad min heap free ratio: %s\n",
2443 option->optionString);
2444 return JNI_EINVAL;
2445 }
2446 if (dminf < 0.0 || dminf > 1.0) {
2447 jio_fprintf(defaultStream::error_stream(),
2448 "-Xminf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2449 tail);
2450 return JNI_EINVAL;
2451 }
2452 const uintx uminf = (uintx)(dminf * 100);
2453 if (MaxHeapFreeRatio < uminf) {
2454 jio_fprintf(defaultStream::error_stream(),
2455 "-Xminf value (%s) must be less than or equal to the implicit -Xmaxf value (%.2f)\n",
2456 tail, MaxHeapFreeRatio / 100.0f);
2457 return JNI_EINVAL;
2458 }
2459 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, uminf) != JVMFlag::SUCCESS) {
2460 return JNI_EINVAL;
2461 }
2462 // -Xss
2463 } else if (match_option(option, "-Xss", &tail)) {
2464 intx value = 0;
2465 jint err = parse_xss(option, tail, &value);
2466 if (err != JNI_OK) {
2467 return err;
2468 }
2469 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2470 return JNI_EINVAL;
2471 }
2472 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2473 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2474 julong long_ReservedCodeCacheSize = 0;
2475
2476 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2477 if (errcode != arg_in_range) {
2478 jio_fprintf(defaultStream::error_stream(),
2479 "Invalid maximum code cache size: %s.\n", option->optionString);
2480 return JNI_EINVAL;
2481 }
2482 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2483 return JNI_EINVAL;
2484 }
2485 // -green
2486 } else if (match_option(option, "-green")) {
2487 jio_fprintf(defaultStream::error_stream(),
2488 "Green threads support not available\n");
2489 return JNI_EINVAL;
2490 // -native
2491 } else if (match_option(option, "-native")) {
2492 // HotSpot always uses native threads, ignore silently for compatibility
2493 // -Xrs
2494 } else if (match_option(option, "-Xrs")) {
2495 // Classic/EVM option, new functionality
2496 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2497 return JNI_EINVAL;
2498 }
2499 // -Xprof
2500 } else if (match_option(option, "-Xprof")) {
2501 char version[256];
2502 // Obsolete in JDK 10
2503 JDK_Version::jdk(10).to_string(version, sizeof(version));
2504 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2505 // -Xinternalversion
2506 } else if (match_option(option, "-Xinternalversion")) {
2507 jio_fprintf(defaultStream::output_stream(), "%s\n",
2508 VM_Version::internal_vm_info_string());
2509 vm_exit(0);
2510 #ifndef PRODUCT
2511 // -Xprintflags
2512 } else if (match_option(option, "-Xprintflags")) {
2513 JVMFlag::printFlags(tty, false);
2514 vm_exit(0);
2515 #endif
2516 // -D
2517 } else if (match_option(option, "-D", &tail)) {
2518 const char* value;
2519 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2520 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2521 // abort if -Djava.endorsed.dirs is set
2522 jio_fprintf(defaultStream::output_stream(),
2523 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2524 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2525 return JNI_EINVAL;
2526 }
2527 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2528 *value != '\0' && strcmp(value, "\"\"") != 0) {
2529 // abort if -Djava.ext.dirs is set
2530 jio_fprintf(defaultStream::output_stream(),
2531 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2532 return JNI_EINVAL;
2533 }
2534 // Check for module related properties. They must be set using the modules
2535 // options. For example: use "--add-modules=java.sql", not
2536 // "-Djdk.module.addmods=java.sql"
2537 if (is_internal_module_property(option->optionString + 2)) {
2538 needs_module_property_warning = true;
2539 continue;
2540 }
2541 if (!add_property(tail)) {
2542 return JNI_ENOMEM;
2543 }
2544 // Out of the box management support
2545 if (match_option(option, "-Dcom.sun.management", &tail)) {
2546 #if INCLUDE_MANAGEMENT
2547 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2548 return JNI_EINVAL;
2549 }
2550 // management agent in module jdk.management.agent
2551 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2552 return JNI_ENOMEM;
2553 }
2554 #else
2555 jio_fprintf(defaultStream::output_stream(),
2556 "-Dcom.sun.management is not supported in this VM.\n");
2557 return JNI_ERR;
2558 #endif
2559 }
2560 // -Xint
2561 } else if (match_option(option, "-Xint")) {
2562 set_mode_flags(_int);
2563 mode_flag_cmd_line = true;
2564 // -Xmixed
2565 } else if (match_option(option, "-Xmixed")) {
2566 set_mode_flags(_mixed);
2567 mode_flag_cmd_line = true;
2568 // -Xcomp
2569 } else if (match_option(option, "-Xcomp")) {
2570 // for testing the compiler; turn off all flags that inhibit compilation
2571 set_mode_flags(_comp);
2572 mode_flag_cmd_line = true;
2573 // -Xshare:dump
2574 } else if (match_option(option, "-Xshare:dump")) {
2575 CDSConfig::enable_dumping_static_archive();
2576 CDSConfig::set_old_cds_flags_used();
2577 // -Xshare:on
2578 } else if (match_option(option, "-Xshare:on")) {
2579 UseSharedSpaces = true;
2580 RequireSharedSpaces = true;
2581 CDSConfig::set_old_cds_flags_used();
2582 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2583 } else if (match_option(option, "-Xshare:auto")) {
2584 UseSharedSpaces = true;
2585 RequireSharedSpaces = false;
2586 xshare_auto_cmd_line = true;
2587 CDSConfig::set_old_cds_flags_used();
2588 // -Xshare:off
2589 } else if (match_option(option, "-Xshare:off")) {
2590 UseSharedSpaces = false;
2591 RequireSharedSpaces = false;
2592 CDSConfig::set_old_cds_flags_used();
2593 // -Xverify
2594 } else if (match_option(option, "-Xverify", &tail)) {
2595 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2596 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2597 return JNI_EINVAL;
2598 }
2599 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2600 return JNI_EINVAL;
2601 }
2602 } else if (strcmp(tail, ":remote") == 0) {
2603 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2604 return JNI_EINVAL;
2605 }
2606 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2607 return JNI_EINVAL;
2608 }
2609 } else if (strcmp(tail, ":none") == 0) {
2610 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2611 return JNI_EINVAL;
2612 }
2613 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2614 return JNI_EINVAL;
2615 }
2616 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2617 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2618 return JNI_EINVAL;
2619 }
2620 // -Xdebug
2621 } else if (match_option(option, "-Xdebug")) {
2622 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2623 } else if (match_option(option, "-Xloggc:", &tail)) {
2624 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2625 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2626 _legacyGCLogging.lastFlag = 2;
2627 _legacyGCLogging.file = os::strdup_check_oom(tail);
2628 } else if (match_option(option, "-Xlog", &tail)) {
2629 bool ret = false;
2630 if (strcmp(tail, ":help") == 0) {
2631 fileStream stream(defaultStream::output_stream());
2632 LogConfiguration::print_command_line_help(&stream);
2633 vm_exit(0);
2634 } else if (strcmp(tail, ":disable") == 0) {
2635 LogConfiguration::disable_logging();
2636 ret = true;
2637 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2638 const char* async_tail = tail + strlen(":async");
2639 ret = LogConfiguration::parse_async_argument(async_tail);
2640 } else if (*tail == '\0') {
2641 ret = LogConfiguration::parse_command_line_arguments();
2642 assert(ret, "-Xlog without arguments should never fail to parse");
2643 } else if (*tail == ':') {
2644 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2645 }
2646 if (ret == false) {
2647 jio_fprintf(defaultStream::error_stream(),
2648 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2649 tail);
2650 return JNI_EINVAL;
2651 }
2652 // JNI hooks
2653 } else if (match_option(option, "-Xcheck", &tail)) {
2654 if (!strcmp(tail, ":jni")) {
2655 #if !INCLUDE_JNI_CHECK
2656 warning("JNI CHECKING is not supported in this VM");
2657 #else
2658 CheckJNICalls = true;
2659 #endif // INCLUDE_JNI_CHECK
2660 } else if (is_bad_option(option, args->ignoreUnrecognized,
2661 "check")) {
2662 return JNI_EINVAL;
2663 }
2664 } else if (match_option(option, "vfprintf")) {
2665 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2666 } else if (match_option(option, "exit")) {
2667 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2668 } else if (match_option(option, "abort")) {
2669 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2670 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2671 // and the last option wins.
2672 } else if (match_option(option, "-XX:+NeverTenure")) {
2673 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2674 return JNI_EINVAL;
2675 }
2676 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2677 return JNI_EINVAL;
2678 }
2679 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2680 return JNI_EINVAL;
2681 }
2682 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2683 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2684 return JNI_EINVAL;
2685 }
2686 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2687 return JNI_EINVAL;
2688 }
2689 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2690 return JNI_EINVAL;
2691 }
2692 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2693 uint max_tenuring_thresh = 0;
2694 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2695 jio_fprintf(defaultStream::error_stream(),
2696 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2697 return JNI_EINVAL;
2698 }
2699
2700 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2701 return JNI_EINVAL;
2702 }
2703
2704 if (MaxTenuringThreshold == 0) {
2705 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2706 return JNI_EINVAL;
2707 }
2708 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2709 return JNI_EINVAL;
2710 }
2711 } else {
2712 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2713 return JNI_EINVAL;
2714 }
2715 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2716 return JNI_EINVAL;
2717 }
2718 }
2719 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2720 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2721 return JNI_EINVAL;
2722 }
2723 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2724 return JNI_EINVAL;
2725 }
2726 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2727 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2728 return JNI_EINVAL;
2729 }
2730 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2731 return JNI_EINVAL;
2732 }
2733 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2734 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2735 return JNI_EINVAL;
2736 }
2737 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2738 return JNI_EINVAL;
2739 }
2740 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2741 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2742 return JNI_EINVAL;
2743 }
2744 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2745 return JNI_EINVAL;
2746 }
2747 } else if (match_option(option, "--finalization=", &tail)) {
2748 if (strcmp(tail, "enabled") == 0) {
2749 InstanceKlass::set_finalization_enabled(true);
2750 } else if (strcmp(tail, "disabled") == 0) {
2751 InstanceKlass::set_finalization_enabled(false);
2752 } else {
2753 jio_fprintf(defaultStream::error_stream(),
2754 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2755 tail);
2756 return JNI_EINVAL;
2757 }
2758 #if !defined(DTRACE_ENABLED)
2759 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2760 jio_fprintf(defaultStream::error_stream(),
2761 "DTraceMethodProbes flag is not applicable for this configuration\n");
2762 return JNI_EINVAL;
2763 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2764 jio_fprintf(defaultStream::error_stream(),
2765 "DTraceAllocProbes flag is not applicable for this configuration\n");
2766 return JNI_EINVAL;
2767 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2768 jio_fprintf(defaultStream::error_stream(),
2769 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2770 return JNI_EINVAL;
2771 #endif // !defined(DTRACE_ENABLED)
2772 #ifdef ASSERT
2773 } else if (match_option(option, "-XX:+FullGCALot")) {
2774 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2775 return JNI_EINVAL;
2776 }
2777 #endif
2778 #if !INCLUDE_MANAGEMENT
2779 } else if (match_option(option, "-XX:+ManagementServer")) {
2780 jio_fprintf(defaultStream::error_stream(),
2781 "ManagementServer is not supported in this VM.\n");
2782 return JNI_ERR;
2783 #endif // INCLUDE_MANAGEMENT
2784 #if INCLUDE_JVMCI
2785 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2786 if (EnableJVMCIProduct) {
2787 jio_fprintf(defaultStream::error_stream(),
2788 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2789 return JNI_EINVAL;
2790 }
2791 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2792 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2793 if (use_graal_jit) {
2794 const char* jvmci_compiler = get_property("jvmci.Compiler");
2795 if (jvmci_compiler != nullptr) {
2796 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2797 jio_fprintf(defaultStream::error_stream(),
2798 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2799 return JNI_ERR;
2800 }
2801 } else if (!add_property("jvmci.Compiler=graal")) {
2802 return JNI_ENOMEM;
2803 }
2804 }
2805
2806 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2807 if (EnableJVMCIProduct) {
2808 continue;
2809 }
2810 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2811 // Allow this flag if it has been unlocked.
2812 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2813 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2814 jio_fprintf(defaultStream::error_stream(),
2815 "Unable to enable JVMCI in product mode\n");
2816 return JNI_ERR;
2817 }
2818 }
2819 // The flag was locked so process normally to report that error
2820 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2821 return JNI_EINVAL;
2822 }
2823 #endif // INCLUDE_JVMCI
2824 #if INCLUDE_JFR
2825 } else if (match_jfr_option(&option)) {
2826 return JNI_EINVAL;
2827 #endif
2828 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2829 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2830 // already been handled
2831 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2832 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2833 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2834 return JNI_EINVAL;
2835 }
2836 }
2837 // Unknown option
2838 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2839 return JNI_ERR;
2840 }
2841 }
2842
2843 // PrintSharedArchiveAndExit will turn on
2844 // -Xshare:on
2845 // -Xlog:class+path=info
2846 if (PrintSharedArchiveAndExit) {
2847 UseSharedSpaces = true;
2848 RequireSharedSpaces = true;
2849 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2850 }
2851
2852 fix_appclasspath();
2853
2854 return JNI_OK;
2855 }
2856
2857 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) {
2858 // For java.base check for duplicate --patch-module options being specified on the command line.
2859 // This check is only required for java.base, all other duplicate module specifications
2860 // will be checked during module system initialization. The module system initialization
2861 // will throw an ExceptionInInitializerError if this situation occurs.
2862 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2863 if (patch_mod_javabase) {
2864 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2865 } else {
2866 patch_mod_javabase = true;
2867 }
2868 }
2869
2870 // Create GrowableArray lazily, only if --patch-module has been specified
2871 if (_patch_mod_prefix == nullptr) {
2872 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2873 }
2874
2875 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2876 }
2877
2878 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2879 //
2880 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2881 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2882 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2883 // path is treated as the current directory.
2884 //
2885 // This causes problems with CDS, which requires that all directories specified in the classpath
2886 // must be empty. In most cases, applications do NOT want to load classes from the current
2887 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2888 // scripts compatible with CDS.
2889 void Arguments::fix_appclasspath() {
2890 if (IgnoreEmptyClassPaths) {
2891 const char separator = *os::path_separator();
2892 const char* src = _java_class_path->value();
2893
2894 // skip over all the leading empty paths
2895 while (*src == separator) {
2896 src ++;
2897 }
2898
2899 char* copy = os::strdup_check_oom(src, mtArguments);
2900
2901 // trim all trailing empty paths
2902 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2903 *tail = '\0';
2904 }
2905
2906 char from[3] = {separator, separator, '\0'};
2907 char to [2] = {separator, '\0'};
2908 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2909 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2910 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2911 }
2912
2913 _java_class_path->set_writeable_value(copy);
2914 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2915 }
2916 }
2917
2918 jint Arguments::finalize_vm_init_args() {
2919 // check if the default lib/endorsed directory exists; if so, error
2920 char path[JVM_MAXPATHLEN];
2921 const char* fileSep = os::file_separator();
2922 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2923
2924 DIR* dir = os::opendir(path);
2925 if (dir != nullptr) {
2926 jio_fprintf(defaultStream::output_stream(),
2927 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2928 "in modular form will be supported via the concept of upgradeable modules.\n");
2929 os::closedir(dir);
2930 return JNI_ERR;
2931 }
2932
2933 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2934 dir = os::opendir(path);
2935 if (dir != nullptr) {
2936 jio_fprintf(defaultStream::output_stream(),
2937 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2938 "Use -classpath instead.\n.");
2939 os::closedir(dir);
2940 return JNI_ERR;
2941 }
2942
2943 // This must be done after all arguments have been processed
2944 // and the container support has been initialized since AggressiveHeap
2945 // relies on the amount of total memory available.
2946 if (AggressiveHeap) {
2947 jint result = set_aggressive_heap_flags();
2948 if (result != JNI_OK) {
2949 return result;
2950 }
2951 }
2952
2953 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2954 // but like -Xint, leave compilation thresholds unaffected.
2955 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2956 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2957 set_mode_flags(_int);
2958 }
2959
2960 #ifdef ZERO
2961 // Zero always runs in interpreted mode
2962 set_mode_flags(_int);
2963 #endif
2964
2965 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2966 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2967 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2968 }
2969
2970 #if !COMPILER2_OR_JVMCI
2971 // Don't degrade server performance for footprint
2972 if (FLAG_IS_DEFAULT(UseLargePages) &&
2973 MaxHeapSize < LargePageHeapSizeThreshold) {
2974 // No need for large granularity pages w/small heaps.
2975 // Note that large pages are enabled/disabled for both the
2976 // Java heap and the code cache.
2977 FLAG_SET_DEFAULT(UseLargePages, false);
2978 }
2979
2980 UNSUPPORTED_OPTION(ProfileInterpreter);
2981 #endif
2982
2983 // Parse the CompilationMode flag
2984 if (!CompilationModeFlag::initialize()) {
2985 return JNI_ERR;
2986 }
2987
2988 if (!check_vm_args_consistency()) {
2989 return JNI_ERR;
2990 }
2991
2992
2993 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2994 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2995 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2996
2997 return JNI_OK;
2998 }
2999
3000 // Helper class for controlling the lifetime of JavaVMInitArgs
3001 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3002 // deleted on the destruction of the ScopedVMInitArgs object.
3003 class ScopedVMInitArgs : public StackObj {
3004 private:
3005 JavaVMInitArgs _args;
3006 char* _container_name;
3007 bool _is_set;
3008 char* _vm_options_file_arg;
3009
3010 public:
3011 ScopedVMInitArgs(const char *container_name) {
3012 _args.version = JNI_VERSION_1_2;
3013 _args.nOptions = 0;
3014 _args.options = nullptr;
3015 _args.ignoreUnrecognized = false;
3016 _container_name = (char *)container_name;
3017 _is_set = false;
3018 _vm_options_file_arg = nullptr;
3019 }
3020
3021 // Populates the JavaVMInitArgs object represented by this
3022 // ScopedVMInitArgs object with the arguments in options. The
3023 // allocated memory is deleted by the destructor. If this method
3024 // returns anything other than JNI_OK, then this object is in a
3025 // partially constructed state, and should be abandoned.
3026 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3027 _is_set = true;
3028 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3029 JavaVMOption, options->length(), mtArguments);
3030 if (options_arr == nullptr) {
3031 return JNI_ENOMEM;
3032 }
3033 _args.options = options_arr;
3034
3035 for (int i = 0; i < options->length(); i++) {
3036 options_arr[i] = options->at(i);
3037 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3038 if (options_arr[i].optionString == nullptr) {
3039 // Rely on the destructor to do cleanup.
3040 _args.nOptions = i;
3041 return JNI_ENOMEM;
3042 }
3043 }
3044
3045 _args.nOptions = options->length();
3046 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3047 return JNI_OK;
3048 }
3049
3050 JavaVMInitArgs* get() { return &_args; }
3051 char* container_name() { return _container_name; }
3052 bool is_set() { return _is_set; }
3053 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3054 char* vm_options_file_arg() { return _vm_options_file_arg; }
3055
3056 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3057 if (_vm_options_file_arg != nullptr) {
3058 os::free(_vm_options_file_arg);
3059 }
3060 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3061 }
3062
3063 ~ScopedVMInitArgs() {
3064 if (_vm_options_file_arg != nullptr) {
3065 os::free(_vm_options_file_arg);
3066 }
3067 if (_args.options == nullptr) return;
3068 for (int i = 0; i < _args.nOptions; i++) {
3069 os::free(_args.options[i].optionString);
3070 }
3071 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3072 }
3073
3074 // Insert options into this option list, to replace option at
3075 // vm_options_file_pos (-XX:VMOptionsFile)
3076 jint insert(const JavaVMInitArgs* args,
3077 const JavaVMInitArgs* args_to_insert,
3078 const int vm_options_file_pos) {
3079 assert(_args.options == nullptr, "shouldn't be set yet");
3080 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3081 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3082
3083 int length = args->nOptions + args_to_insert->nOptions - 1;
3084 // Construct new option array
3085 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3086 for (int i = 0; i < args->nOptions; i++) {
3087 if (i == vm_options_file_pos) {
3088 // insert the new options starting at the same place as the
3089 // -XX:VMOptionsFile option
3090 for (int j = 0; j < args_to_insert->nOptions; j++) {
3091 options.push(args_to_insert->options[j]);
3092 }
3093 } else {
3094 options.push(args->options[i]);
3095 }
3096 }
3097 // make into options array
3098 return set_args(&options);
3099 }
3100 };
3101
3102 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3103 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3104 }
3105
3106 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3107 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3108 }
3109
3110 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) {
3111 for (int index = args->nOptions - 1; index >= 0; index--) {
3112 JavaVMOption* option = args->options + index;
3113 if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) {
3114 return option;
3115 }
3116 }
3117
3118 return nullptr;
3119 }
3120
3121 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args,
3122 ScopedVMInitArgs* jdk_aot_vm_options_args) {
3123 // Don't bother scanning all the args if this env variable is not set
3124 if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) {
3125 return JNI_OK;
3126 }
3127
3128 // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value
3129 // of AOTMode.
3130 JavaVMOption* option = nullptr;
3131 for (int i = all_args->length() - 1; i >= 0; i--) {
3132 if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) {
3133 break;
3134 }
3135 }
3136
3137 if (option != nullptr) {
3138 // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet,
3139 // so its value is not reflected inside the global variable AOTMode.
3140 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) {
3141 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3142 }
3143 } else {
3144 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode,
3145 // which would have been set inside process_settings_file();
3146 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) {
3147 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3148 }
3149 }
3150
3151 return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args);
3152 }
3153
3154 jint Arguments::parse_options_environment_variable(const char* name,
3155 ScopedVMInitArgs* vm_args) {
3156 char *buffer = ::getenv(name);
3157
3158 // Don't check this environment variable if user has special privileges
3159 // (e.g. unix su command).
3160 if (buffer == nullptr || os::have_special_privileges()) {
3161 return JNI_OK;
3162 }
3163
3164 if ((buffer = os::strdup(buffer)) == nullptr) {
3165 return JNI_ENOMEM;
3166 }
3167
3168 jio_fprintf(defaultStream::error_stream(),
3169 "Picked up %s: %s\n", name, buffer);
3170
3171 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3172
3173 os::free(buffer);
3174 return retcode;
3175 }
3176
3177 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3178 // read file into buffer
3179 int fd = ::open(file_name, O_RDONLY);
3180 if (fd < 0) {
3181 jio_fprintf(defaultStream::error_stream(),
3182 "Could not open options file '%s'\n",
3183 file_name);
3184 return JNI_ERR;
3185 }
3186
3187 struct stat stbuf;
3188 int retcode = os::stat(file_name, &stbuf);
3189 if (retcode != 0) {
3190 jio_fprintf(defaultStream::error_stream(),
3191 "Could not stat options file '%s'\n",
3192 file_name);
3193 ::close(fd);
3194 return JNI_ERR;
3195 }
3196
3197 if (stbuf.st_size == 0) {
3198 // tell caller there is no option data and that is ok
3199 ::close(fd);
3200 return JNI_OK;
3201 }
3202
3203 // '+ 1' for null termination even with max bytes
3204 size_t bytes_alloc = stbuf.st_size + 1;
3205
3206 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3207 if (nullptr == buf) {
3208 jio_fprintf(defaultStream::error_stream(),
3209 "Could not allocate read buffer for options file parse\n");
3210 ::close(fd);
3211 return JNI_ENOMEM;
3212 }
3213
3214 memset(buf, 0, bytes_alloc);
3215
3216 // Fill buffer
3217 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3218 ::close(fd);
3219 if (bytes_read < 0) {
3220 FREE_C_HEAP_ARRAY(char, buf);
3221 jio_fprintf(defaultStream::error_stream(),
3222 "Could not read options file '%s'\n", file_name);
3223 return JNI_ERR;
3224 }
3225
3226 if (bytes_read == 0) {
3227 // tell caller there is no option data and that is ok
3228 FREE_C_HEAP_ARRAY(char, buf);
3229 return JNI_OK;
3230 }
3231
3232 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3233
3234 FREE_C_HEAP_ARRAY(char, buf);
3235 return retcode;
3236 }
3237
3238 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3239 // Construct option array
3240 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3241
3242 // some pointers to help with parsing
3243 char *buffer_end = buffer + buf_len;
3244 char *opt_hd = buffer;
3245 char *wrt = buffer;
3246 char *rd = buffer;
3247
3248 // parse all options
3249 while (rd < buffer_end) {
3250 // skip leading white space from the input string
3251 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3252 rd++;
3253 }
3254
3255 if (rd >= buffer_end) {
3256 break;
3257 }
3258
3259 // Remember this is where we found the head of the token.
3260 opt_hd = wrt;
3261
3262 // Tokens are strings of non white space characters separated
3263 // by one or more white spaces.
3264 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3265 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3266 int quote = *rd; // matching quote to look for
3267 rd++; // don't copy open quote
3268 while (rd < buffer_end && *rd != quote) {
3269 // include everything (even spaces)
3270 // up until the close quote
3271 *wrt++ = *rd++; // copy to option string
3272 }
3273
3274 if (rd < buffer_end) {
3275 rd++; // don't copy close quote
3276 } else {
3277 // did not see closing quote
3278 jio_fprintf(defaultStream::error_stream(),
3279 "Unmatched quote in %s\n", name);
3280 return JNI_ERR;
3281 }
3282 } else {
3283 *wrt++ = *rd++; // copy to option string
3284 }
3285 }
3286
3287 // steal a white space character and set it to null
3288 *wrt++ = '\0';
3289 // We now have a complete token
3290
3291 JavaVMOption option;
3292 option.optionString = opt_hd;
3293 option.extraInfo = nullptr;
3294
3295 options.append(option); // Fill in option
3296
3297 rd++; // Advance to next character
3298 }
3299
3300 // Fill out JavaVMInitArgs structure.
3301 return vm_args->set_args(&options);
3302 }
3303
3304 #ifndef PRODUCT
3305 // Determine whether LogVMOutput should be implicitly turned on.
3306 static bool use_vm_log() {
3307 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3308 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3309 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3310 PrintAssembly || TraceDeoptimization ||
3311 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3312 return true;
3313 }
3314
3315 #ifdef COMPILER1
3316 if (PrintC1Statistics) {
3317 return true;
3318 }
3319 #endif // COMPILER1
3320
3321 #ifdef COMPILER2
3322 if (PrintOptoAssembly || PrintOptoStatistics) {
3323 return true;
3324 }
3325 #endif // COMPILER2
3326
3327 return false;
3328 }
3329
3330 #endif // PRODUCT
3331
3332 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3333 for (int index = 0; index < args->nOptions; index++) {
3334 const JavaVMOption* option = args->options + index;
3335 const char* tail;
3336 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3337 return true;
3338 }
3339 }
3340 return false;
3341 }
3342
3343 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3344 const char* vm_options_file,
3345 const int vm_options_file_pos,
3346 ScopedVMInitArgs* vm_options_file_args,
3347 ScopedVMInitArgs* args_out) {
3348 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3349 if (code != JNI_OK) {
3350 return code;
3351 }
3352
3353 if (vm_options_file_args->get()->nOptions < 1) {
3354 return JNI_OK;
3355 }
3356
3357 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3358 jio_fprintf(defaultStream::error_stream(),
3359 "A VM options file may not refer to a VM options file. "
3360 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3361 "options file '%s' in options container '%s' is an error.\n",
3362 vm_options_file_args->vm_options_file_arg(),
3363 vm_options_file_args->container_name());
3364 return JNI_EINVAL;
3365 }
3366
3367 return args_out->insert(args, vm_options_file_args->get(),
3368 vm_options_file_pos);
3369 }
3370
3371 // Expand -XX:VMOptionsFile found in args_in as needed.
3372 // mod_args and args_out parameters may return values as needed.
3373 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3374 ScopedVMInitArgs* mod_args,
3375 JavaVMInitArgs** args_out) {
3376 jint code = match_special_option_and_act(args_in, mod_args);
3377 if (code != JNI_OK) {
3378 return code;
3379 }
3380
3381 if (mod_args->is_set()) {
3382 // args_in contains -XX:VMOptionsFile and mod_args contains the
3383 // original options from args_in along with the options expanded
3384 // from the VMOptionsFile. Return a short-hand to the caller.
3385 *args_out = mod_args->get();
3386 } else {
3387 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3388 }
3389 return JNI_OK;
3390 }
3391
3392 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3393 ScopedVMInitArgs* args_out) {
3394 // Remaining part of option string
3395 const char* tail;
3396 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3397
3398 for (int index = 0; index < args->nOptions; index++) {
3399 const JavaVMOption* option = args->options + index;
3400 if (match_option(option, "-XX:Flags=", &tail)) {
3401 Arguments::set_jvm_flags_file(tail);
3402 continue;
3403 }
3404 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3405 if (vm_options_file_args.found_vm_options_file_arg()) {
3406 jio_fprintf(defaultStream::error_stream(),
3407 "The option '%s' is already specified in the options "
3408 "container '%s' so the specification of '%s' in the "
3409 "same options container is an error.\n",
3410 vm_options_file_args.vm_options_file_arg(),
3411 vm_options_file_args.container_name(),
3412 option->optionString);
3413 return JNI_EINVAL;
3414 }
3415 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3416 // If there's a VMOptionsFile, parse that
3417 jint code = insert_vm_options_file(args, tail, index,
3418 &vm_options_file_args, args_out);
3419 if (code != JNI_OK) {
3420 return code;
3421 }
3422 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3423 if (args_out->is_set()) {
3424 // The VMOptions file inserted some options so switch 'args'
3425 // to the new set of options, and continue processing which
3426 // preserves "last option wins" semantics.
3427 args = args_out->get();
3428 // The first option from the VMOptionsFile replaces the
3429 // current option. So we back track to process the
3430 // replacement option.
3431 index--;
3432 }
3433 continue;
3434 }
3435 if (match_option(option, "-XX:+PrintVMOptions")) {
3436 PrintVMOptions = true;
3437 continue;
3438 }
3439 if (match_option(option, "-XX:-PrintVMOptions")) {
3440 PrintVMOptions = false;
3441 continue;
3442 }
3443 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3444 IgnoreUnrecognizedVMOptions = true;
3445 continue;
3446 }
3447 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3448 IgnoreUnrecognizedVMOptions = false;
3449 continue;
3450 }
3451 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3452 JVMFlag::printFlags(tty, false);
3453 vm_exit(0);
3454 }
3455
3456 #ifndef PRODUCT
3457 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3458 JVMFlag::printFlags(tty, true);
3459 vm_exit(0);
3460 }
3461 #endif
3462 }
3463 return JNI_OK;
3464 }
3465
3466 static void print_options(const JavaVMInitArgs *args) {
3467 const char* tail;
3468 for (int index = 0; index < args->nOptions; index++) {
3469 const JavaVMOption *option = args->options + index;
3470 if (match_option(option, "-XX:", &tail)) {
3471 logOption(tail);
3472 }
3473 }
3474 }
3475
3476 bool Arguments::handle_deprecated_print_gc_flags() {
3477 if (PrintGC) {
3478 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3479 }
3480 if (PrintGCDetails) {
3481 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3482 }
3483
3484 if (_legacyGCLogging.lastFlag == 2) {
3485 // -Xloggc was used to specify a filename
3486 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3487
3488 LogTarget(Error, logging) target;
3489 LogStream errstream(target);
3490 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3491 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3492 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3493 }
3494 return true;
3495 }
3496
3497 static void apply_debugger_ergo() {
3498 #ifdef ASSERT
3499 if (ReplayCompiles) {
3500 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3501 }
3502
3503 if (UseDebuggerErgo) {
3504 // Turn on sub-flags
3505 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3506 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3507 }
3508
3509 if (UseDebuggerErgo2) {
3510 // Debugging with limited number of CPUs
3511 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3512 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3513 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3514 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3515 }
3516 #endif // ASSERT
3517 }
3518
3519 // Parse entry point called from JNI_CreateJavaVM
3520
3521 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3522 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3523 JVMFlag::check_all_flag_declarations();
3524
3525 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3526 const char* hotspotrc = ".hotspotrc";
3527 bool settings_file_specified = false;
3528 bool needs_hotspotrc_warning = false;
3529 ScopedVMInitArgs initial_vm_options_args("");
3530 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3531 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3532 ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'");
3533
3534 // Pointers to current working set of containers
3535 JavaVMInitArgs* cur_cmd_args;
3536 JavaVMInitArgs* cur_vm_options_args;
3537 JavaVMInitArgs* cur_java_options_args;
3538 JavaVMInitArgs* cur_java_tool_options_args;
3539 JavaVMInitArgs* cur_jdk_aot_vm_options_args;
3540
3541 // Containers for modified/expanded options
3542 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3543 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3544 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3545 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3546 ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'");
3547
3548 GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args;
3549
3550 jint code =
3551 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3552 if (code != JNI_OK) {
3553 return code;
3554 }
3555
3556 // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM.
3557 // This is an undocumented feature.
3558 code = parse_java_options_environment_variable(&initial_java_options_args);
3559 if (code != JNI_OK) {
3560 return code;
3561 }
3562
3563 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3564 char *vmoptions = ClassLoader::lookup_vm_options();
3565 if (vmoptions != nullptr) {
3566 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3567 FREE_C_HEAP_ARRAY(char, vmoptions);
3568 if (code != JNI_OK) {
3569 return code;
3570 }
3571 }
3572
3573 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3574 &mod_java_tool_options_args,
3575 &cur_java_tool_options_args);
3576 if (code != JNI_OK) {
3577 return code;
3578 }
3579
3580 code = expand_vm_options_as_needed(initial_cmd_args,
3581 &mod_cmd_args,
3582 &cur_cmd_args);
3583 if (code != JNI_OK) {
3584 return code;
3585 }
3586
3587 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3588 &mod_java_options_args,
3589 &cur_java_options_args);
3590 if (code != JNI_OK) {
3591 return code;
3592 }
3593
3594 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3595 &mod_vm_options_args,
3596 &cur_vm_options_args);
3597 if (code != JNI_OK) {
3598 return code;
3599 }
3600
3601 const char* flags_file = Arguments::get_jvm_flags_file();
3602 settings_file_specified = (flags_file != nullptr);
3603
3604 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags.
3605 if (settings_file_specified) {
3606 if (!process_settings_file(flags_file, true,
3607 IgnoreUnrecognizedVMOptions)) {
3608 return JNI_EINVAL;
3609 }
3610 } else {
3611 #ifdef ASSERT
3612 // Parse default .hotspotrc settings file
3613 if (!process_settings_file(".hotspotrc", false,
3614 IgnoreUnrecognizedVMOptions)) {
3615 return JNI_EINVAL;
3616 }
3617 #else
3618 struct stat buf;
3619 if (os::stat(hotspotrc, &buf) == 0) {
3620 needs_hotspotrc_warning = true;
3621 }
3622 #endif
3623 }
3624
3625 // The settings in the args are applied in this order to the the JVM global flags.
3626 // For historical reasons, the order is DIFFERENT than the scanning order of
3627 // the above expand_vm_options_as_needed() calls.
3628 all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE});
3629 all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR});
3630 all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE});
3631 all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR});
3632
3633 // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all
3634 // the options that have been gathered above.
3635 code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args);
3636 if (code != JNI_OK) {
3637 return code;
3638 }
3639 code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(),
3640 &mod_jdk_aot_vm_options_args,
3641 &cur_jdk_aot_vm_options_args);
3642 if (code != JNI_OK) {
3643 return code;
3644 }
3645
3646 for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) {
3647 JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index;
3648 const char* optionString = option->optionString;
3649 if (strstr(optionString, "-XX:AOTMode=") == optionString &&
3650 strcmp(optionString, "-XX:AOTMode=create") != 0) {
3651 jio_fprintf(defaultStream::error_stream(),
3652 "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString);
3653 return JNI_ERR;
3654 }
3655 }
3656
3657 all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR});
3658
3659 if (IgnoreUnrecognizedVMOptions) {
3660 // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of
3661 // the JDK so it shouldn't have bad options.
3662 cur_cmd_args->ignoreUnrecognized = true;
3663 cur_java_tool_options_args->ignoreUnrecognized = true;
3664 cur_java_options_args->ignoreUnrecognized = true;
3665 cur_jdk_aot_vm_options_args->ignoreUnrecognized = true;
3666 }
3667
3668 if (PrintVMOptions) {
3669 // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed.
3670 print_options(cur_java_tool_options_args);
3671 print_options(cur_cmd_args);
3672 print_options(cur_java_options_args);
3673 print_options(cur_jdk_aot_vm_options_args);
3674 }
3675
3676 // Apply the settings in these args to the JVM global flags.
3677 jint result = parse_vm_init_args(&all_args);
3678
3679 if (result != JNI_OK) {
3680 return result;
3681 }
3682
3683 // Delay warning until here so that we've had a chance to process
3684 // the -XX:-PrintWarnings flag
3685 if (needs_hotspotrc_warning) {
3686 warning("%s file is present but has been ignored. "
3687 "Run with -XX:Flags=%s to load the file.",
3688 hotspotrc, hotspotrc);
3689 }
3690
3691 if (needs_module_property_warning) {
3692 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3693 " names that are reserved for internal use.");
3694 }
3695
3696 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3697 UNSUPPORTED_OPTION(UseLargePages);
3698 #endif
3699
3700 #if defined(AIX)
3701 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3702 #endif
3703
3704 #ifndef PRODUCT
3705 if (TraceBytecodesAt != 0) {
3706 TraceBytecodes = true;
3707 }
3708 #endif // PRODUCT
3709
3710 if (ScavengeRootsInCode == 0) {
3711 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3712 warning("Forcing ScavengeRootsInCode non-zero");
3713 }
3714 ScavengeRootsInCode = 1;
3715 }
3716
3717 if (!handle_deprecated_print_gc_flags()) {
3718 return JNI_EINVAL;
3719 }
3720
3721 // Set object alignment values.
3722 set_object_alignment();
3723
3724 #if !INCLUDE_CDS
3725 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3726 jio_fprintf(defaultStream::error_stream(),
3727 "Shared spaces are not supported in this VM\n");
3728 return JNI_ERR;
3729 }
3730 if (DumpLoadedClassList != nullptr) {
3731 jio_fprintf(defaultStream::error_stream(),
3732 "DumpLoadedClassList is not supported in this VM\n");
3733 return JNI_ERR;
3734 }
3735 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3736 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) {
3737 warning("Shared spaces are not supported in this VM");
3738 UseSharedSpaces = false;
3739 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3740 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot));
3741 }
3742 no_shared_spaces("CDS Disabled");
3743 #endif // INCLUDE_CDS
3744
3745 // Verify NMT arguments
3746 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3747 if (lvl == NMT_unknown) {
3748 jio_fprintf(defaultStream::error_stream(),
3749 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3750 return JNI_ERR;
3751 }
3752 if (PrintNMTStatistics && lvl == NMT_off) {
3753 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3754 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3755 }
3756
3757 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3758 if (trace_dependencies && VerifyDependencies) {
3759 warning("dependency logging results may be inflated by VerifyDependencies");
3760 }
3761
3762 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3763 log_is_enabled(Info, class, load, cause);
3764 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3765 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3766 }
3767
3768 apply_debugger_ergo();
3769
3770 // The VMThread needs to stop now and then to execute these debug options.
3771 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3772 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3773 }
3774
3775 if (log_is_enabled(Info, arguments)) {
3776 LogStream st(Log(arguments)::info());
3777 Arguments::print_on(&st);
3778 }
3779
3780 return JNI_OK;
3781 }
3782
3783 void Arguments::set_compact_headers_flags() {
3784 #ifdef _LP64
3785 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3786 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3787 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3788 }
3789 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3790 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3791 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3792 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3793
3794 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3795 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3796 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3797 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3798 } else {
3799 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3800 }
3801 }
3802 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3803 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3804 }
3805 #endif
3806 }
3807
3808 jint Arguments::apply_ergo() {
3809 // Set flags based on ergonomics.
3810 jint result = set_ergonomics_flags();
3811 if (result != JNI_OK) return result;
3812
3813 // Set heap size based on available physical memory
3814 set_heap_size();
3815
3816 GCConfig::arguments()->initialize();
3817
3818 set_compact_headers_flags();
3819
3820 if (UseCompressedClassPointers) {
3821 CompressedKlassPointers::pre_initialize();
3822 }
3823
3824 CDSConfig::ergo_initialize();
3825
3826 // Initialize Metaspace flags and alignments
3827 Metaspace::ergo_initialize();
3828
3829 if (!StringDedup::ergo_initialize()) {
3830 return JNI_EINVAL;
3831 }
3832
3833 // Set compiler flags after GC is selected and GC specific
3834 // flags (LoopStripMiningIter) are set.
3835 CompilerConfig::ergo_initialize();
3836
3837 // Set bytecode rewriting flags
3838 set_bytecode_flags();
3839
3840 // Set flags if aggressive optimization flags are enabled
3841 jint code = set_aggressive_opts_flags();
3842 if (code != JNI_OK) {
3843 return code;
3844 }
3845
3846 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3847 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3848 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3849 warning("UseSecondarySupersTable is not supported");
3850 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3851 }
3852 if (!UseSecondarySupersTable) {
3853 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3854 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3855 }
3856
3857 #ifdef ZERO
3858 // Clear flags not supported on zero.
3859 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3860 #endif // ZERO
3861
3862 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3863 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3864 DebugNonSafepoints = true;
3865 }
3866
3867 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3868 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3869 }
3870
3871 // Treat the odd case where local verification is enabled but remote
3872 // verification is not as if both were enabled.
3873 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3874 log_info(verification)("Turning on remote verification because local verification is on");
3875 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3876 }
3877
3878 #ifndef PRODUCT
3879 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3880 if (use_vm_log()) {
3881 LogVMOutput = true;
3882 }
3883 }
3884 #endif // PRODUCT
3885
3886 if (PrintCommandLineFlags) {
3887 JVMFlag::printSetFlags(tty);
3888 }
3889
3890 #if COMPILER2_OR_JVMCI
3891 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3892 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3893 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3894 }
3895 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3896
3897 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3898 if (!EnableVectorReboxing) {
3899 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3900 } else {
3901 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3902 }
3903 }
3904 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3905 }
3906 #endif // COMPILER2_OR_JVMCI
3907
3908 #ifdef COMPILER2
3909 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
3910 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
3911 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
3912 }
3913 #endif // COMPILER2
3914
3915 if (log_is_enabled(Info, perf, class, link)) {
3916 if (!UsePerfData) {
3917 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3918 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
3919 assert(!log_is_enabled(Info, perf, class, link), "sanity");
3920 }
3921 }
3922
3923 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3924 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3925 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3926 }
3927 }
3928 return JNI_OK;
3929 }
3930
3931 jint Arguments::adjust_after_os() {
3932 if (UseNUMA) {
3933 if (UseParallelGC) {
3934 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3935 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3936 }
3937 }
3938 }
3939 return JNI_OK;
3940 }
3941
3942 int Arguments::PropertyList_count(SystemProperty* pl) {
3943 int count = 0;
3944 while(pl != nullptr) {
3945 count++;
3946 pl = pl->next();
3947 }
3948 return count;
3949 }
3950
3951 // Return the number of readable properties.
3952 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3953 int count = 0;
3954 while(pl != nullptr) {
3955 if (pl->readable()) {
3956 count++;
3957 }
3958 pl = pl->next();
3959 }
3960 return count;
3961 }
3962
3963 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3964 assert(key != nullptr, "just checking");
3965 SystemProperty* prop;
3966 for (prop = pl; prop != nullptr; prop = prop->next()) {
3967 if (strcmp(key, prop->key()) == 0) return prop->value();
3968 }
3969 return nullptr;
3970 }
3971
3972 // Return the value of the requested property provided that it is a readable property.
3973 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3974 assert(key != nullptr, "just checking");
3975 SystemProperty* prop;
3976 // Return the property value if the keys match and the property is not internal or
3977 // it's the special internal property "jdk.boot.class.path.append".
3978 for (prop = pl; prop != nullptr; prop = prop->next()) {
3979 if (strcmp(key, prop->key()) == 0) {
3980 if (!prop->internal()) {
3981 return prop->value();
3982 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3983 return prop->value();
3984 } else {
3985 // Property is internal and not jdk.boot.class.path.append so return null.
3986 return nullptr;
3987 }
3988 }
3989 }
3990 return nullptr;
3991 }
3992
3993 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3994 SystemProperty* p = *plist;
3995 if (p == nullptr) {
3996 *plist = new_p;
3997 } else {
3998 while (p->next() != nullptr) {
3999 p = p->next();
4000 }
4001 p->set_next(new_p);
4002 }
4003 }
4004
4005 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4006 bool writeable, bool internal) {
4007 if (plist == nullptr)
4008 return;
4009
4010 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4011 PropertyList_add(plist, new_p);
4012 }
4013
4014 void Arguments::PropertyList_add(SystemProperty *element) {
4015 PropertyList_add(&_system_properties, element);
4016 }
4017
4018 // This add maintains unique property key in the list.
4019 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4020 PropertyAppendable append, PropertyWriteable writeable,
4021 PropertyInternal internal) {
4022 if (plist == nullptr)
4023 return;
4024
4025 // If property key exists and is writeable, then update with new value.
4026 // Trying to update a non-writeable property is silently ignored.
4027 SystemProperty* prop;
4028 for (prop = *plist; prop != nullptr; prop = prop->next()) {
4029 if (strcmp(k, prop->key()) == 0) {
4030 if (append == AppendProperty) {
4031 prop->append_writeable_value(v);
4032 } else {
4033 prop->set_writeable_value(v);
4034 }
4035 return;
4036 }
4037 }
4038
4039 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4040 }
4041
4042 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4043 // Returns true if all of the source pointed by src has been copied over to
4044 // the destination buffer pointed by buf. Otherwise, returns false.
4045 // Notes:
4046 // 1. If the length (buflen) of the destination buffer excluding the
4047 // null terminator character is not long enough for holding the expanded
4048 // pid characters, it also returns false instead of returning the partially
4049 // expanded one.
4050 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4051 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4052 char* buf, size_t buflen) {
4053 const char* p = src;
4054 char* b = buf;
4055 const char* src_end = &src[srclen];
4056 char* buf_end = &buf[buflen - 1];
4057
4058 while (p < src_end && b < buf_end) {
4059 if (*p == '%') {
4060 switch (*(++p)) {
4061 case '%': // "%%" ==> "%"
4062 *b++ = *p++;
4063 break;
4064 case 'p': { // "%p" ==> current process id
4065 // buf_end points to the character before the last character so
4066 // that we could write '\0' to the end of the buffer.
4067 size_t buf_sz = buf_end - b + 1;
4068 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4069
4070 // if jio_snprintf fails or the buffer is not long enough to hold
4071 // the expanded pid, returns false.
4072 if (ret < 0 || ret >= (int)buf_sz) {
4073 return false;
4074 } else {
4075 b += ret;
4076 assert(*b == '\0', "fail in copy_expand_pid");
4077 if (p == src_end && b == buf_end + 1) {
4078 // reach the end of the buffer.
4079 return true;
4080 }
4081 }
4082 p++;
4083 break;
4084 }
4085 default :
4086 *b++ = '%';
4087 }
4088 } else {
4089 *b++ = *p++;
4090 }
4091 }
4092 *b = '\0';
4093 return (p == src_end); // return false if not all of the source was copied
4094 }