1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/aotLogging.hpp"
26 #include "cds/cds_globals.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/javaAssertions.hpp"
30 #include "classfile/moduleEntry.hpp"
31 #include "classfile/stringTable.hpp"
32 #include "classfile/symbolTable.hpp"
33 #include "compiler/compilerDefinitions.hpp"
34 #include "gc/shared/gcArguments.hpp"
35 #include "gc/shared/gcConfig.hpp"
36 #include "gc/shared/genArguments.hpp"
37 #include "gc/shared/stringdedup/stringDedup.hpp"
38 #include "gc/shared/tlab_globals.hpp"
39 #include "jvm.h"
40 #include "logging/log.hpp"
41 #include "logging/logConfiguration.hpp"
42 #include "logging/logStream.hpp"
43 #include "logging/logTag.hpp"
44 #include "memory/allocation.inline.hpp"
45 #include "nmt/nmtCommon.hpp"
46 #include "oops/compressedKlass.hpp"
47 #include "oops/instanceKlass.hpp"
48 #include "oops/objLayout.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "prims/jvmtiAgentList.hpp"
51 #include "prims/jvmtiExport.hpp"
52 #include "runtime/arguments.hpp"
53 #include "runtime/flags/jvmFlag.hpp"
54 #include "runtime/flags/jvmFlagAccess.hpp"
55 #include "runtime/flags/jvmFlagLimit.hpp"
56 #include "runtime/globals_extension.hpp"
57 #include "runtime/java.hpp"
58 #include "runtime/os.hpp"
59 #include "runtime/safepoint.hpp"
60 #include "runtime/safepointMechanism.hpp"
61 #include "runtime/synchronizer.hpp"
62 #include "runtime/vm_version.hpp"
63 #include "services/management.hpp"
64 #include "utilities/align.hpp"
65 #include "utilities/checkedCast.hpp"
66 #include "utilities/debug.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/macros.hpp"
69 #include "utilities/parseInteger.hpp"
70 #include "utilities/powerOfTwo.hpp"
71 #include "utilities/stringUtils.hpp"
72 #include "utilities/systemMemoryBarrier.hpp"
73 #if INCLUDE_JFR
74 #include "jfr/jfr.hpp"
75 #endif
76
77 #include <limits>
78
79 static const char _default_java_launcher[] = "generic";
80
81 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
82
83 char* Arguments::_jvm_flags_file = nullptr;
84 char** Arguments::_jvm_flags_array = nullptr;
85 int Arguments::_num_jvm_flags = 0;
86 char** Arguments::_jvm_args_array = nullptr;
87 int Arguments::_num_jvm_args = 0;
88 unsigned int Arguments::_addmods_count = 0;
89 #if INCLUDE_JVMCI
90 bool Arguments::_jvmci_module_added = false;
91 #endif
92 char* Arguments::_java_command = nullptr;
93 SystemProperty* Arguments::_system_properties = nullptr;
94 size_t Arguments::_conservative_max_heap_alignment = 0;
95 Arguments::Mode Arguments::_mode = _mixed;
96 const char* Arguments::_java_vendor_url_bug = nullptr;
97 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
98 bool Arguments::_executing_unit_tests = false;
99
100 // These parameters are reset in method parse_vm_init_args()
101 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
102 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
103 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
104 bool Arguments::_ClipInlining = ClipInlining;
105 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
106
107 bool Arguments::_enable_preview = false;
108 bool Arguments::_has_jdwp_agent = false;
109
110 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
111
112 // These are not set by the JDK's built-in launchers, but they can be set by
113 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
114 // JavaVMOption in jni.h.
115 abort_hook_t Arguments::_abort_hook = nullptr;
116 exit_hook_t Arguments::_exit_hook = nullptr;
117 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
118
119
120 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
121 SystemProperty *Arguments::_java_library_path = nullptr;
122 SystemProperty *Arguments::_java_home = nullptr;
123 SystemProperty *Arguments::_java_class_path = nullptr;
124 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
125 SystemProperty *Arguments::_vm_info = nullptr;
126
127 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
128 PathString *Arguments::_boot_class_path = nullptr;
129 bool Arguments::_has_jimage = false;
130
131 char* Arguments::_ext_dirs = nullptr;
132
133 // True if -Xshare:auto option was specified.
134 static bool xshare_auto_cmd_line = false;
135
136 // True if -Xint/-Xmixed/-Xcomp were specified
137 static bool mode_flag_cmd_line = false;
138
139 struct VMInitArgsGroup {
140 const JavaVMInitArgs* _args;
141 JVMFlagOrigin _origin;
142 };
143
144 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
145 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
146 if (new_value == nullptr) {
147 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
148 return false;
149 }
150 if (_value != nullptr) {
151 FreeHeap(_value);
152 }
153 _value = new_value;
154 strcpy(_value, value);
155 return true;
156 }
157
158 void PathString::append_value(const char *value) {
159 char *sp;
160 size_t len = 0;
161 if (value != nullptr) {
162 len = strlen(value);
163 if (_value != nullptr) {
164 len += strlen(_value);
165 }
166 sp = AllocateHeap(len+2, mtArguments);
167 assert(sp != nullptr, "Unable to allocate space for new append path value");
168 if (sp != nullptr) {
169 if (_value != nullptr) {
170 strcpy(sp, _value);
171 strcat(sp, os::path_separator());
172 strcat(sp, value);
173 FreeHeap(_value);
174 } else {
175 strcpy(sp, value);
176 }
177 _value = sp;
178 }
179 }
180 }
181
182 PathString::PathString(const char* value) {
183 if (value == nullptr) {
184 _value = nullptr;
185 } else {
186 _value = AllocateHeap(strlen(value)+1, mtArguments);
187 strcpy(_value, value);
188 }
189 }
190
191 PathString::~PathString() {
192 if (_value != nullptr) {
193 FreeHeap(_value);
194 _value = nullptr;
195 }
196 }
197
198 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
199 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
200 size_t len = strlen(module_name) + 1;
201 _module_name = AllocateHeap(len, mtInternal);
202 strncpy(_module_name, module_name, len); // copy the trailing null
203 _path = new PathString(path);
204 }
205
206 ModulePatchPath::~ModulePatchPath() {
207 if (_module_name != nullptr) {
208 FreeHeap(_module_name);
209 _module_name = nullptr;
210 }
211 if (_path != nullptr) {
212 delete _path;
213 _path = nullptr;
214 }
215 }
216
217 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
218 if (key == nullptr) {
219 _key = nullptr;
220 } else {
221 _key = AllocateHeap(strlen(key)+1, mtArguments);
222 strcpy(_key, key);
223 }
224 _next = nullptr;
225 _internal = internal;
226 _writeable = writeable;
227 }
228
229 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
230 // part of the option string.
231 static bool match_option(const JavaVMOption *option, const char* name,
232 const char** tail) {
233 size_t len = strlen(name);
234 if (strncmp(option->optionString, name, len) == 0) {
235 *tail = option->optionString + len;
236 return true;
237 } else {
238 return false;
239 }
240 }
241
242 // Check if 'option' matches 'name'. No "tail" is allowed.
243 static bool match_option(const JavaVMOption *option, const char* name) {
244 const char* tail = nullptr;
245 bool result = match_option(option, name, &tail);
246 if (tail != nullptr && *tail == '\0') {
247 return result;
248 } else {
249 return false;
250 }
251 }
252
253 // Return true if any of the strings in null-terminated array 'names' matches.
254 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
255 // the option must match exactly.
256 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
257 bool tail_allowed) {
258 for (/* empty */; *names != nullptr; ++names) {
259 if (match_option(option, *names, tail)) {
260 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
261 return true;
262 }
263 }
264 }
265 return false;
266 }
267
268 #if INCLUDE_JFR
269 static bool _has_jfr_option = false; // is using JFR
270
271 // return true on failure
272 static bool match_jfr_option(const JavaVMOption** option) {
273 assert((*option)->optionString != nullptr, "invariant");
274 char* tail = nullptr;
275 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
276 _has_jfr_option = true;
277 return Jfr::on_start_flight_recording_option(option, tail);
278 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
279 _has_jfr_option = true;
280 return Jfr::on_flight_recorder_option(option, tail);
281 }
282 return false;
283 }
284
285 bool Arguments::has_jfr_option() {
286 return _has_jfr_option;
287 }
288 #endif
289
290 static void logOption(const char* opt) {
291 if (PrintVMOptions) {
292 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
293 }
294 }
295
296 bool needs_module_property_warning = false;
297
298 #define MODULE_PROPERTY_PREFIX "jdk.module."
299 #define MODULE_PROPERTY_PREFIX_LEN 11
300 #define ADDEXPORTS "addexports"
301 #define ADDEXPORTS_LEN 10
302 #define ADDREADS "addreads"
303 #define ADDREADS_LEN 8
304 #define ADDOPENS "addopens"
305 #define ADDOPENS_LEN 8
306 #define PATCH "patch"
307 #define PATCH_LEN 5
308 #define ADDMODS "addmods"
309 #define ADDMODS_LEN 7
310 #define LIMITMODS "limitmods"
311 #define LIMITMODS_LEN 9
312 #define PATH "path"
313 #define PATH_LEN 4
314 #define UPGRADE_PATH "upgrade.path"
315 #define UPGRADE_PATH_LEN 12
316 #define ENABLE_NATIVE_ACCESS "enable.native.access"
317 #define ENABLE_NATIVE_ACCESS_LEN 20
318 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
319 #define ILLEGAL_NATIVE_ACCESS_LEN 21
320
321 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
322 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
323 return ((strncmp(option, property, len) == 0) &&
324 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
325 }
326
327 // Return true if property starts with "jdk.module." and its ensuing chars match
328 // any of the reserved module properties.
329 // property should be passed without the leading "-D".
330 bool Arguments::is_internal_module_property(const char* property) {
331 return internal_module_property_helper(property, false);
332 }
333
334 // Returns true if property is one of those recognized by is_internal_module_property() but
335 // is not supported by CDS archived full module graph.
336 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
337 return internal_module_property_helper(property, true);
338 }
339
340 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
341 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
342 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
343 if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
344 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
345 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
346 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN)) {
347 return true;
348 }
349
350 if (!check_for_cds) {
351 // CDS notes: these properties are supported by CDS archived full module graph.
352 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
353 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
354 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
355 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
356 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
357 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
358 return true;
359 }
360 }
361 }
362 return false;
363 }
364
365 // Process java launcher properties.
366 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
367 // See if sun.java.launcher is defined.
368 // Must do this before setting up other system properties,
369 // as some of them may depend on launcher type.
370 for (int index = 0; index < args->nOptions; index++) {
371 const JavaVMOption* option = args->options + index;
372 const char* tail;
373
374 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
375 process_java_launcher_argument(tail, option->extraInfo);
376 continue;
377 }
378 if (match_option(option, "-XX:+ExecutingUnitTests")) {
379 _executing_unit_tests = true;
380 continue;
381 }
382 }
383 }
384
385 // Initialize system properties key and value.
386 void Arguments::init_system_properties() {
387
388 // Set up _boot_class_path which is not a property but
389 // relies heavily on argument processing and the jdk.boot.class.path.append
390 // property. It is used to store the underlying boot class path.
391 _boot_class_path = new PathString(nullptr);
392
393 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
394 "Java Virtual Machine Specification", false));
395 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
396 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
397 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
398
399 // Initialize the vm.info now, but it will need updating after argument parsing.
400 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
401
402 // Following are JVMTI agent writable properties.
403 // Properties values are set to nullptr and they are
404 // os specific they are initialized in os::init_system_properties_values().
405 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
406 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
407 _java_home = new SystemProperty("java.home", nullptr, true);
408 _java_class_path = new SystemProperty("java.class.path", "", true);
409 // jdk.boot.class.path.append is a non-writeable, internal property.
410 // It can only be set by either:
411 // - -Xbootclasspath/a:
412 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
413 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
414
415 // Add to System Property list.
416 PropertyList_add(&_system_properties, _sun_boot_library_path);
417 PropertyList_add(&_system_properties, _java_library_path);
418 PropertyList_add(&_system_properties, _java_home);
419 PropertyList_add(&_system_properties, _java_class_path);
420 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
421 PropertyList_add(&_system_properties, _vm_info);
422
423 // Set OS specific system properties values
424 os::init_system_properties_values();
425 }
426
427 // Update/Initialize System properties after JDK version number is known
428 void Arguments::init_version_specific_system_properties() {
429 enum { bufsz = 16 };
430 char buffer[bufsz];
431 const char* spec_vendor = "Oracle Corporation";
432 uint32_t spec_version = JDK_Version::current().major_version();
433
434 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
435
436 PropertyList_add(&_system_properties,
437 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
438 PropertyList_add(&_system_properties,
439 new SystemProperty("java.vm.specification.version", buffer, false));
440 PropertyList_add(&_system_properties,
441 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
442 }
443
444 /*
445 * -XX argument processing:
446 *
447 * -XX arguments are defined in several places, such as:
448 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
449 * -XX arguments are parsed in parse_argument().
450 * -XX argument bounds checking is done in check_vm_args_consistency().
451 *
452 * Over time -XX arguments may change. There are mechanisms to handle common cases:
453 *
454 * ALIASED: An option that is simply another name for another option. This is often
455 * part of the process of deprecating a flag, but not all aliases need
456 * to be deprecated.
457 *
458 * Create an alias for an option by adding the old and new option names to the
459 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
460 *
461 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
462 * support may be removed in the future. Both regular and aliased options may be
463 * deprecated.
464 *
465 * Add a deprecation warning for an option (or alias) by adding an entry in the
466 * "special_jvm_flags" table and setting the "deprecated_in" field.
467 * Often an option "deprecated" in one major release will
468 * be made "obsolete" in the next. In this case the entry should also have its
469 * "obsolete_in" field set.
470 *
471 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
472 * on the command line. A warning is printed to let the user know that option might not
473 * be accepted in the future.
474 *
475 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
476 * table and setting the "obsolete_in" field.
477 *
478 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
479 * to the current JDK version. The system will flatly refuse to admit the existence of
480 * the flag. This allows a flag to die automatically over JDK releases.
481 *
482 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
483 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
484 * - Newly obsolete or expired deprecated options should have their global variable
485 * definitions removed (from globals.hpp, etc) and related implementations removed.
486 *
487 * Recommended approach for removing options:
488 *
489 * To remove options commonly used by customers (e.g. product -XX options), use
490 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
491 *
492 * To remove internal options (e.g. diagnostic, experimental, develop options), use
493 * a 2-step model adding major release numbers to the obsolete and expire columns.
494 *
495 * To change the name of an option, use the alias table as well as a 2-step
496 * model adding major release numbers to the deprecate and expire columns.
497 * Think twice about aliasing commonly used customer options.
498 *
499 * There are times when it is appropriate to leave a future release number as undefined.
500 *
501 * Tests: Aliases should be tested in VMAliasOptions.java.
502 * Deprecated options should be tested in VMDeprecatedOptions.java.
503 */
504
505 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
506 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
507 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
508 // the command-line as usual, but will issue a warning.
509 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
510 // the command-line, while issuing a warning and ignoring the flag value.
511 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
512 // existence of the flag.
513 //
514 // MANUAL CLEANUP ON JDK VERSION UPDATES:
515 // This table ensures that the handling of options will update automatically when the JDK
516 // version is incremented, but the source code needs to be cleanup up manually:
517 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
518 // variable should be removed, as well as users of the variable.
519 // - As "deprecated" options age into "obsolete" options, move the entry into the
520 // "Obsolete Flags" section of the table.
521 // - All expired options should be removed from the table.
522 static SpecialFlag const special_jvm_flags[] = {
523 // -------------- Deprecated Flags --------------
524 // --- Non-alias flags - sorted by obsolete_in then expired_in:
525 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
526 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
527 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
528 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
529 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
530 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
531 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
532 #ifdef _LP64
533 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::undefined() },
534 #endif
535 { "ParallelRefProcEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
536 { "ParallelRefProcBalancingEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
537 { "PSChunkLargeArrays", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
538 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
539 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
540
541 // -------------- Obsolete Flags - sorted by expired_in --------------
542
543 #ifdef LINUX
544 { "UseOprofile", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) },
545 #endif
546 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
547 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::undefined() },
548 { "ZMarkStackSpaceLimit", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
549 #if defined(AARCH64)
550 { "NearCpool", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
551 #endif
552
553 { "AdaptiveSizeMajorGCDecayTimeScale", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
554 { "AdaptiveSizePolicyInitializingSteps", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
555 { "AdaptiveSizePolicyOutputInterval", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
556 { "AdaptiveSizeThroughPutPolicy", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
557 { "AdaptiveTimeWeight", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
558 { "PausePadding", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
559 { "SurvivorPadding", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
560 { "TenuredGenerationSizeIncrement", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
561 { "TenuredGenerationSizeSupplement", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
562 { "TenuredGenerationSizeSupplementDecay", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
563 { "UseAdaptiveGenerationSizePolicyAtMajorCollection", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
564 { "UseAdaptiveGenerationSizePolicyAtMinorCollection", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
565 { "UseAdaptiveSizeDecayMajorGCCost", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
566 { "UseAdaptiveSizePolicyFootprintGoal", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
567 { "UseAdaptiveSizePolicyWithSystemGC", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
568 { "UsePSAdaptiveSurvivorSizePolicy", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
569
570 { "PretenureSizeThreshold", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
571
572 #ifdef ASSERT
573 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
574 #endif
575
576 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
577 // These entries will generate build errors. Their purpose is to test the macros.
578 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
579 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
580 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
581 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
582 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
583 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
584 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
585 #endif
586
587 { nullptr, JDK_Version(0), JDK_Version(0) }
588 };
589
590 // Flags that are aliases for other flags.
591 typedef struct {
592 const char* alias_name;
593 const char* real_name;
594 } AliasedFlag;
595
596 static AliasedFlag const aliased_jvm_flags[] = {
597 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
598 { nullptr, nullptr}
599 };
600
601 // Return true if "v" is less than "other", where "other" may be "undefined".
602 static bool version_less_than(JDK_Version v, JDK_Version other) {
603 assert(!v.is_undefined(), "must be defined");
604 if (!other.is_undefined() && v.compare(other) >= 0) {
605 return false;
606 } else {
607 return true;
608 }
609 }
610
611 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
612 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
613 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
614 flag = special_jvm_flags[i];
615 return true;
616 }
617 }
618 return false;
619 }
620
621 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
622 assert(version != nullptr, "Must provide a version buffer");
623 SpecialFlag flag;
624 if (lookup_special_flag(flag_name, flag)) {
625 if (!flag.obsolete_in.is_undefined()) {
626 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
627 *version = flag.obsolete_in;
628 // This flag may have been marked for obsoletion in this version, but we may not
629 // have actually removed it yet. Rather than ignoring it as soon as we reach
630 // this version we allow some time for the removal to happen. So if the flag
631 // still actually exists we process it as normal, but issue an adjusted warning.
632 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
633 if (real_flag != nullptr) {
634 char version_str[256];
635 version->to_string(version_str, sizeof(version_str));
636 warning("Temporarily processing option %s; support is scheduled for removal in %s",
637 flag_name, version_str);
638 return false;
639 }
640 return true;
641 }
642 }
643 }
644 return false;
645 }
646
647 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
648 assert(version != nullptr, "Must provide a version buffer");
649 SpecialFlag flag;
650 if (lookup_special_flag(flag_name, flag)) {
651 if (!flag.deprecated_in.is_undefined()) {
652 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
653 version_less_than(JDK_Version::current(), flag.expired_in)) {
654 *version = flag.deprecated_in;
655 return 1;
656 } else {
657 return -1;
658 }
659 }
660 }
661 return 0;
662 }
663
664 const char* Arguments::real_flag_name(const char *flag_name) {
665 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
666 const AliasedFlag& flag_status = aliased_jvm_flags[i];
667 if (strcmp(flag_status.alias_name, flag_name) == 0) {
668 return flag_status.real_name;
669 }
670 }
671 return flag_name;
672 }
673
674 #ifdef ASSERT
675 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
676 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
677 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
678 return true;
679 }
680 }
681 return false;
682 }
683
684 // Verifies the correctness of the entries in the special_jvm_flags table.
685 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
686 // version being earlier than the deprecation version, then a warning is issued
687 // and verification fails - by returning false. If it is detected that the table
688 // is out of date, with respect to the current version, then ideally a warning is
689 // issued but verification does not fail. This allows the VM to operate when the
690 // version is first updated, without needing to update all the impacted flags at
691 // the same time. In practice we can't issue the warning immediately when the version
692 // is updated as it occurs for every test and some tests are not prepared to handle
693 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
694 // if the check_globals flag is true, and in addition allow a grace period and only
695 // check for stale flags when we hit build 25 (which is far enough into the 6 month
696 // release cycle that all flag updates should have been processed, whilst still
697 // leaving time to make the change before RDP2).
698 // We use a gtest to call this, passing true, so that we can detect stale flags before
699 // the end of the release cycle.
700
701 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
702
703 bool Arguments::verify_special_jvm_flags(bool check_globals) {
704 bool success = true;
705 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
706 const SpecialFlag& flag = special_jvm_flags[i];
707 if (lookup_special_flag(flag.name, i)) {
708 warning("Duplicate special flag declaration \"%s\"", flag.name);
709 success = false;
710 }
711 if (flag.deprecated_in.is_undefined() &&
712 flag.obsolete_in.is_undefined()) {
713 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
714 success = false;
715 }
716
717 if (!flag.deprecated_in.is_undefined()) {
718 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
719 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
720 success = false;
721 }
722
723 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
724 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
725 success = false;
726 }
727 }
728
729 if (!flag.obsolete_in.is_undefined()) {
730 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
731 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
732 success = false;
733 }
734
735 // if flag has become obsolete it should not have a "globals" flag defined anymore.
736 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
737 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
738 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
739 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
740 success = false;
741 }
742 }
743
744 } else if (!flag.expired_in.is_undefined()) {
745 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
746 success = false;
747 }
748
749 if (!flag.expired_in.is_undefined()) {
750 // if flag has become expired it should not have a "globals" flag defined anymore.
751 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
752 !version_less_than(JDK_Version::current(), flag.expired_in)) {
753 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
754 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
755 success = false;
756 }
757 }
758 }
759 }
760 return success;
761 }
762 #endif
763
764 bool Arguments::atojulong(const char *s, julong* result) {
765 return parse_integer(s, result);
766 }
767
768 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
769 if (size < min_size) return arg_too_small;
770 if (size > max_size) return arg_too_big;
771 return arg_in_range;
772 }
773
774 // Describe an argument out of range error
775 void Arguments::describe_range_error(ArgsRange errcode) {
776 switch(errcode) {
777 case arg_too_big:
778 jio_fprintf(defaultStream::error_stream(),
779 "The specified size exceeds the maximum "
780 "representable size.\n");
781 break;
782 case arg_too_small:
783 case arg_unreadable:
784 case arg_in_range:
785 // do nothing for now
786 break;
787 default:
788 ShouldNotReachHere();
789 }
790 }
791
792 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
793 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
794 return true;
795 } else {
796 return false;
797 }
798 }
799
800 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
801 // strtod allows leading whitespace, but our flag format does not.
802 if (*value == '\0' || isspace((unsigned char) *value)) {
803 return false;
804 }
805 char* end;
806 errno = 0;
807 double v = strtod(value, &end);
808 if ((errno != 0) || (*end != 0)) {
809 return false;
810 }
811 if (g_isnan(v) || !g_isfinite(v)) {
812 // Currently we cannot handle these special values.
813 return false;
814 }
815
816 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
817 return true;
818 }
819 return false;
820 }
821
822 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
823 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
824
825 if (flag->is_int()) {
826 int v;
827 if (parse_integer(value, &v)) {
828 result = JVMFlagAccess::set_int(flag, &v, origin);
829 }
830 } else if (flag->is_uint()) {
831 uint v;
832 if (parse_integer(value, &v)) {
833 result = JVMFlagAccess::set_uint(flag, &v, origin);
834 }
835 } else if (flag->is_intx()) {
836 intx v;
837 if (parse_integer(value, &v)) {
838 result = JVMFlagAccess::set_intx(flag, &v, origin);
839 }
840 } else if (flag->is_uintx()) {
841 uintx v;
842 if (parse_integer(value, &v)) {
843 result = JVMFlagAccess::set_uintx(flag, &v, origin);
844 }
845 } else if (flag->is_uint64_t()) {
846 uint64_t v;
847 if (parse_integer(value, &v)) {
848 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
849 }
850 } else if (flag->is_size_t()) {
851 size_t v;
852 if (parse_integer(value, &v)) {
853 result = JVMFlagAccess::set_size_t(flag, &v, origin);
854 }
855 }
856
857 return result == JVMFlag::SUCCESS;
858 }
859
860 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
861 if (value[0] == '\0') {
862 value = nullptr;
863 }
864 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
865 // Contract: JVMFlag always returns a pointer that needs freeing.
866 FREE_C_HEAP_ARRAY(char, value);
867 return true;
868 }
869
870 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
871 const char* old_value = "";
872 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
873 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
874 size_t new_len = strlen(new_value);
875 const char* value;
876 char* free_this_too = nullptr;
877 if (old_len == 0) {
878 value = new_value;
879 } else if (new_len == 0) {
880 value = old_value;
881 } else {
882 size_t length = old_len + 1 + new_len + 1;
883 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
884 // each new setting adds another LINE to the switch:
885 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
886 value = buf;
887 free_this_too = buf;
888 }
889 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
890 // JVMFlag always returns a pointer that needs freeing.
891 FREE_C_HEAP_ARRAY(char, value);
892 // JVMFlag made its own copy, so I must delete my own temp. buffer.
893 FREE_C_HEAP_ARRAY(char, free_this_too);
894 return true;
895 }
896
897 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
898 const char* real_name = real_flag_name(arg);
899 JDK_Version since = JDK_Version();
900 switch (is_deprecated_flag(arg, &since)) {
901 case -1: {
902 // Obsolete or expired, so don't process normally,
903 // but allow for an obsolete flag we're still
904 // temporarily allowing.
905 if (!is_obsolete_flag(arg, &since)) {
906 return real_name;
907 }
908 // Note if we're not considered obsolete then we can't be expired either
909 // as obsoletion must come first.
910 return nullptr;
911 }
912 case 0:
913 return real_name;
914 case 1: {
915 char version[256];
916 since.to_string(version, sizeof(version));
917 if (real_name != arg) {
918 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
919 arg, version, real_name);
920 } else {
921 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
922 arg, version);
923 }
924 return real_name;
925 }
926 }
927 ShouldNotReachHere();
928 return nullptr;
929 }
930
931 #define BUFLEN 255
932
933 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
934 char name_copied[BUFLEN+1];
935 if (name[name_length] != 0) {
936 if (name_length > BUFLEN) {
937 return nullptr;
938 } else {
939 strncpy(name_copied, name, name_length);
940 name_copied[name_length] = '\0';
941 name = name_copied;
942 }
943 }
944
945 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
946 if (real_name == nullptr) {
947 return nullptr;
948 }
949 JVMFlag* flag = JVMFlag::find_flag(real_name);
950 return flag;
951 }
952
953 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
954 bool is_bool = false;
955 bool bool_val = false;
956 char c = *arg;
957 if (c == '+' || c == '-') {
958 is_bool = true;
959 bool_val = (c == '+');
960 arg++;
961 }
962
963 const char* name = arg;
964 while (true) {
965 c = *arg;
966 if (isalnum(c) || (c == '_')) {
967 ++arg;
968 } else {
969 break;
970 }
971 }
972
973 size_t name_len = size_t(arg - name);
974 if (name_len == 0) {
975 return false;
976 }
977
978 JVMFlag* flag = find_jvm_flag(name, name_len);
979 if (flag == nullptr) {
980 return false;
981 }
982
983 if (is_bool) {
984 if (*arg != 0) {
985 // Error -- extra characters such as -XX:+BoolFlag=123
986 return false;
987 }
988 return set_bool_flag(flag, bool_val, origin);
989 }
990
991 if (arg[0] == '=') {
992 const char* value = arg + 1;
993 if (flag->is_ccstr()) {
994 if (flag->ccstr_accumulates()) {
995 return append_to_string_flag(flag, value, origin);
996 } else {
997 return set_string_flag(flag, value, origin);
998 }
999 } else if (flag->is_double()) {
1000 return set_fp_numeric_flag(flag, value, origin);
1001 } else {
1002 return set_numeric_flag(flag, value, origin);
1003 }
1004 }
1005
1006 if (arg[0] == ':' && arg[1] == '=') {
1007 // -XX:Foo:=xxx will reset the string flag to the given value.
1008 const char* value = arg + 2;
1009 return set_string_flag(flag, value, origin);
1010 }
1011
1012 return false;
1013 }
1014
1015 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1016 assert(bldarray != nullptr, "illegal argument");
1017
1018 if (arg == nullptr) {
1019 return;
1020 }
1021
1022 int new_count = *count + 1;
1023
1024 // expand the array and add arg to the last element
1025 if (*bldarray == nullptr) {
1026 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1027 } else {
1028 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1029 }
1030 (*bldarray)[*count] = os::strdup_check_oom(arg);
1031 *count = new_count;
1032 }
1033
1034 void Arguments::build_jvm_args(const char* arg) {
1035 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1036 }
1037
1038 void Arguments::build_jvm_flags(const char* arg) {
1039 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1040 }
1041
1042 // utility function to return a string that concatenates all
1043 // strings in a given char** array
1044 const char* Arguments::build_resource_string(char** args, int count) {
1045 if (args == nullptr || count == 0) {
1046 return nullptr;
1047 }
1048 size_t length = 0;
1049 for (int i = 0; i < count; i++) {
1050 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1051 }
1052 char* s = NEW_RESOURCE_ARRAY(char, length);
1053 char* dst = s;
1054 for (int j = 0; j < count; j++) {
1055 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1056 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1057 dst += offset;
1058 length -= offset;
1059 }
1060 return (const char*) s;
1061 }
1062
1063 void Arguments::print_on(outputStream* st) {
1064 st->print_cr("VM Arguments:");
1065 if (num_jvm_flags() > 0) {
1066 st->print("jvm_flags: "); print_jvm_flags_on(st);
1067 st->cr();
1068 }
1069 if (num_jvm_args() > 0) {
1070 st->print("jvm_args: "); print_jvm_args_on(st);
1071 st->cr();
1072 }
1073 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1074 if (_java_class_path != nullptr) {
1075 char* path = _java_class_path->value();
1076 size_t len = strlen(path);
1077 st->print("java_class_path (initial): ");
1078 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1079 if (len == 0) {
1080 st->print_raw_cr("<not set>");
1081 } else {
1082 st->print_raw_cr(path, len);
1083 }
1084 }
1085 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1086 }
1087
1088 void Arguments::print_summary_on(outputStream* st) {
1089 // Print the command line. Environment variables that are helpful for
1090 // reproducing the problem are written later in the hs_err file.
1091 // flags are from setting file
1092 if (num_jvm_flags() > 0) {
1093 st->print_raw("Settings File: ");
1094 print_jvm_flags_on(st);
1095 st->cr();
1096 }
1097 // args are the command line and environment variable arguments.
1098 st->print_raw("Command Line: ");
1099 if (num_jvm_args() > 0) {
1100 print_jvm_args_on(st);
1101 }
1102 // this is the classfile and any arguments to the java program
1103 if (java_command() != nullptr) {
1104 st->print("%s", java_command());
1105 }
1106 st->cr();
1107 }
1108
1109 void Arguments::print_jvm_flags_on(outputStream* st) {
1110 if (_num_jvm_flags > 0) {
1111 for (int i=0; i < _num_jvm_flags; i++) {
1112 st->print("%s ", _jvm_flags_array[i]);
1113 }
1114 }
1115 }
1116
1117 void Arguments::print_jvm_args_on(outputStream* st) {
1118 if (_num_jvm_args > 0) {
1119 for (int i=0; i < _num_jvm_args; i++) {
1120 st->print("%s ", _jvm_args_array[i]);
1121 }
1122 }
1123 }
1124
1125 bool Arguments::process_argument(const char* arg,
1126 jboolean ignore_unrecognized,
1127 JVMFlagOrigin origin) {
1128 JDK_Version since = JDK_Version();
1129
1130 if (parse_argument(arg, origin)) {
1131 return true;
1132 }
1133
1134 // Determine if the flag has '+', '-', or '=' characters.
1135 bool has_plus_minus = (*arg == '+' || *arg == '-');
1136 const char* const argname = has_plus_minus ? arg + 1 : arg;
1137
1138 size_t arg_len;
1139 const char* equal_sign = strchr(argname, '=');
1140 if (equal_sign == nullptr) {
1141 arg_len = strlen(argname);
1142 } else {
1143 arg_len = equal_sign - argname;
1144 }
1145
1146 // Only make the obsolete check for valid arguments.
1147 if (arg_len <= BUFLEN) {
1148 // Construct a string which consists only of the argument name without '+', '-', or '='.
1149 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1150 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1151 if (is_obsolete_flag(stripped_argname, &since)) {
1152 char version[256];
1153 since.to_string(version, sizeof(version));
1154 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1155 return true;
1156 }
1157 }
1158
1159 // For locked flags, report a custom error message if available.
1160 // Otherwise, report the standard unrecognized VM option.
1161 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1162 if (found_flag != nullptr) {
1163 char locked_message_buf[BUFLEN];
1164 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1165 if (strlen(locked_message_buf) != 0) {
1166 #ifdef PRODUCT
1167 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1168 if (ignore_unrecognized && mismatched) {
1169 return true;
1170 }
1171 #endif
1172 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1173 }
1174 if (found_flag->is_bool() && !has_plus_minus) {
1175 jio_fprintf(defaultStream::error_stream(),
1176 "Missing +/- setting for VM option '%s'\n", argname);
1177 } else if (!found_flag->is_bool() && has_plus_minus) {
1178 jio_fprintf(defaultStream::error_stream(),
1179 "Unexpected +/- setting in VM option '%s'\n", argname);
1180 } else {
1181 jio_fprintf(defaultStream::error_stream(),
1182 "Improperly specified VM option '%s'\n", argname);
1183 }
1184 } else {
1185 if (ignore_unrecognized) {
1186 return true;
1187 }
1188 jio_fprintf(defaultStream::error_stream(),
1189 "Unrecognized VM option '%s'\n", argname);
1190 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1191 if (fuzzy_matched != nullptr) {
1192 jio_fprintf(defaultStream::error_stream(),
1193 "Did you mean '%s%s%s'?\n",
1194 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1195 fuzzy_matched->name(),
1196 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1197 }
1198 }
1199
1200 // allow for commandline "commenting out" options like -XX:#+Verbose
1201 return arg[0] == '#';
1202 }
1203
1204 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1205 FILE* stream = os::fopen(file_name, "rb");
1206 if (stream == nullptr) {
1207 if (should_exist) {
1208 jio_fprintf(defaultStream::error_stream(),
1209 "Could not open settings file %s\n", file_name);
1210 return false;
1211 } else {
1212 return true;
1213 }
1214 }
1215
1216 char token[1024];
1217 int pos = 0;
1218
1219 bool in_white_space = true;
1220 bool in_comment = false;
1221 bool in_quote = false;
1222 int quote_c = 0;
1223 bool result = true;
1224
1225 int c = getc(stream);
1226 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1227 if (in_white_space) {
1228 if (in_comment) {
1229 if (c == '\n') in_comment = false;
1230 } else {
1231 if (c == '#') in_comment = true;
1232 else if (!isspace((unsigned char) c)) {
1233 in_white_space = false;
1234 token[pos++] = checked_cast<char>(c);
1235 }
1236 }
1237 } else {
1238 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1239 // token ends at newline, or at unquoted whitespace
1240 // this allows a way to include spaces in string-valued options
1241 token[pos] = '\0';
1242 logOption(token);
1243 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1244 build_jvm_flags(token);
1245 pos = 0;
1246 in_white_space = true;
1247 in_quote = false;
1248 } else if (!in_quote && (c == '\'' || c == '"')) {
1249 in_quote = true;
1250 quote_c = c;
1251 } else if (in_quote && (c == quote_c)) {
1252 in_quote = false;
1253 } else {
1254 token[pos++] = checked_cast<char>(c);
1255 }
1256 }
1257 c = getc(stream);
1258 }
1259 if (pos > 0) {
1260 token[pos] = '\0';
1261 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1262 build_jvm_flags(token);
1263 }
1264 fclose(stream);
1265 return result;
1266 }
1267
1268 //=============================================================================================================
1269 // Parsing of properties (-D)
1270
1271 const char* Arguments::get_property(const char* key) {
1272 return PropertyList_get_value(system_properties(), key);
1273 }
1274
1275 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1276 const char* eq = strchr(prop, '=');
1277 const char* key;
1278 const char* value = "";
1279
1280 if (eq == nullptr) {
1281 // property doesn't have a value, thus use passed string
1282 key = prop;
1283 } else {
1284 // property have a value, thus extract it and save to the
1285 // allocated string
1286 size_t key_len = eq - prop;
1287 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1288
1289 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1290 key = tmp_key;
1291
1292 value = &prop[key_len + 1];
1293 }
1294
1295 if (internal == ExternalProperty) {
1296 CDSConfig::check_incompatible_property(key, value);
1297 }
1298
1299 if (strcmp(key, "java.compiler") == 0) {
1300 // we no longer support java.compiler system property, log a warning and let it get
1301 // passed to Java, like any other system property
1302 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1303 // for applications using NONE or empty value, log a more informative message
1304 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1305 } else {
1306 warning("The java.compiler system property is obsolete and no longer supported.");
1307 }
1308 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1309 // append is true, writable is true, internal is false
1310 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1311 WriteableProperty, ExternalProperty);
1312 } else {
1313 if (strcmp(key, "sun.java.command") == 0) {
1314 char *old_java_command = _java_command;
1315 _java_command = os::strdup_check_oom(value, mtArguments);
1316 if (old_java_command != nullptr) {
1317 os::free(old_java_command);
1318 }
1319 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1320 // If this property is set on the command line then its value will be
1321 // displayed in VM error logs as the URL at which to submit such logs.
1322 // Normally the URL displayed in error logs is different from the value
1323 // of this system property, so a different property should have been
1324 // used here, but we leave this as-is in case someone depends upon it.
1325 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1326 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1327 // its value without going through the property list or making a Java call.
1328 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1329 if (old_java_vendor_url_bug != nullptr) {
1330 os::free((void *)old_java_vendor_url_bug);
1331 }
1332 }
1333
1334 // Create new property and add at the end of the list
1335 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1336 }
1337
1338 if (key != prop) {
1339 // SystemProperty copy passed value, thus free previously allocated
1340 // memory
1341 FreeHeap((void *)key);
1342 }
1343
1344 return true;
1345 }
1346
1347 //===========================================================================================================
1348 // Setting int/mixed/comp mode flags
1349
1350 void Arguments::set_mode_flags(Mode mode) {
1351 // Set up default values for all flags.
1352 // If you add a flag to any of the branches below,
1353 // add a default value for it here.
1354 _mode = mode;
1355
1356 // Ensure Agent_OnLoad has the correct initial values.
1357 // This may not be the final mode; mode may change later in onload phase.
1358 PropertyList_unique_add(&_system_properties, "java.vm.info",
1359 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1360
1361 UseInterpreter = true;
1362 UseCompiler = true;
1363 UseLoopCounter = true;
1364
1365 // Default values may be platform/compiler dependent -
1366 // use the saved values
1367 ClipInlining = Arguments::_ClipInlining;
1368 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1369 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1370 BackgroundCompilation = Arguments::_BackgroundCompilation;
1371
1372 // Change from defaults based on mode
1373 switch (mode) {
1374 default:
1375 ShouldNotReachHere();
1376 break;
1377 case _int:
1378 UseCompiler = false;
1379 UseLoopCounter = false;
1380 AlwaysCompileLoopMethods = false;
1381 UseOnStackReplacement = false;
1382 break;
1383 case _mixed:
1384 // same as default
1385 break;
1386 case _comp:
1387 UseInterpreter = false;
1388 BackgroundCompilation = false;
1389 ClipInlining = false;
1390 break;
1391 }
1392 }
1393
1394 // Conflict: required to use shared spaces (-Xshare:on), but
1395 // incompatible command line options were chosen.
1396 void Arguments::no_shared_spaces(const char* message) {
1397 if (RequireSharedSpaces) {
1398 aot_log_error(aot)("%s is incompatible with other specified options.",
1399 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1400 if (CDSConfig::new_aot_flags_used()) {
1401 vm_exit_during_initialization("Unable to use AOT cache", message);
1402 } else {
1403 vm_exit_during_initialization("Unable to use shared archive", message);
1404 }
1405 } else {
1406 if (CDSConfig::new_aot_flags_used()) {
1407 log_warning(aot)("Unable to use AOT cache: %s", message);
1408 } else {
1409 aot_log_info(aot)("Unable to use shared archive: %s", message);
1410 }
1411 UseSharedSpaces = false;
1412 }
1413 }
1414
1415 static void set_object_alignment() {
1416 // Object alignment.
1417 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1418 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1419 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1420 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1421 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1422 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1423
1424 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1425 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1426
1427 // Oop encoding heap max
1428 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1429 }
1430
1431 size_t Arguments::max_heap_for_compressed_oops() {
1432 // Avoid sign flip.
1433 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1434 // We need to fit both the null page and the heap into the memory budget, while
1435 // keeping alignment constraints of the heap. To guarantee the latter, as the
1436 // null page is located before the heap, we pad the null page to the conservative
1437 // maximum alignment that the GC may ever impose upon the heap.
1438 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1439 _conservative_max_heap_alignment);
1440
1441 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1442 NOT_LP64(ShouldNotReachHere(); return 0);
1443 }
1444
1445 void Arguments::set_use_compressed_oops() {
1446 #ifdef _LP64
1447 // MaxHeapSize is not set up properly at this point, but
1448 // the only value that can override MaxHeapSize if we are
1449 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1450 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1451
1452 if (max_heap_size <= max_heap_for_compressed_oops()) {
1453 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1454 FLAG_SET_ERGO(UseCompressedOops, true);
1455 }
1456 } else {
1457 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1458 warning("Max heap size too large for Compressed Oops");
1459 FLAG_SET_DEFAULT(UseCompressedOops, false);
1460 }
1461 }
1462 #endif // _LP64
1463 }
1464
1465 void Arguments::set_conservative_max_heap_alignment() {
1466 // The conservative maximum required alignment for the heap is the maximum of
1467 // the alignments imposed by several sources: any requirements from the heap
1468 // itself and the maximum page size we may run the VM with.
1469 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1470 _conservative_max_heap_alignment = MAX4(heap_alignment,
1471 os::vm_allocation_granularity(),
1472 os::max_page_size(),
1473 GCArguments::compute_heap_alignment());
1474 }
1475
1476 jint Arguments::set_ergonomics_flags() {
1477 GCConfig::initialize();
1478
1479 set_conservative_max_heap_alignment();
1480
1481 #ifdef _LP64
1482 set_use_compressed_oops();
1483
1484 // Also checks that certain machines are slower with compressed oops
1485 // in vm_version initialization code.
1486 #endif // _LP64
1487
1488 return JNI_OK;
1489 }
1490
1491 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1492 // The AggressiveHeap check is a temporary workaround to avoid calling
1493 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1494 // selected. This works because AggressiveHeap implies UseParallelGC
1495 // where we know the ratio will be 1. Once the AggressiveHeap option is
1496 // removed, this can be cleaned up.
1497 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1498 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1499 size_t max_allocatable = os::commit_memory_limit();
1500
1501 return MIN2(limit, max_allocatable / fraction);
1502 }
1503
1504 // Use static initialization to get the default before parsing
1505 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1506
1507 void Arguments::set_heap_size() {
1508 julong phys_mem;
1509
1510 // If the user specified one of these options, they
1511 // want specific memory sizing so do not limit memory
1512 // based on compressed oops addressability.
1513 // Also, memory limits will be calculated based on
1514 // available os physical memory, not our MaxRAM limit,
1515 // unless MaxRAM is also specified.
1516 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1517 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1518 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1519 !FLAG_IS_DEFAULT(MaxRAM));
1520 if (override_coop_limit) {
1521 if (FLAG_IS_DEFAULT(MaxRAM)) {
1522 phys_mem = static_cast<julong>(os::physical_memory());
1523 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1524 } else {
1525 phys_mem = (julong)MaxRAM;
1526 }
1527 } else {
1528 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(static_cast<julong>(os::physical_memory()), (julong)MaxRAM)
1529 : (julong)MaxRAM;
1530 }
1531
1532 // If the maximum heap size has not been set with -Xmx,
1533 // then set it as fraction of the size of physical memory,
1534 // respecting the maximum and minimum sizes of the heap.
1535 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1536 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1537 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1538 if (reasonable_min < MaxHeapSize) {
1539 // Small physical memory, so use a minimum fraction of it for the heap
1540 reasonable_max = reasonable_min;
1541 } else {
1542 // Not-small physical memory, so require a heap at least
1543 // as large as MaxHeapSize
1544 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1545 }
1546
1547 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1548 // Limit the heap size to ErgoHeapSizeLimit
1549 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1550 }
1551
1552 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1553
1554 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1555 // An initial heap size was specified on the command line,
1556 // so be sure that the maximum size is consistent. Done
1557 // after call to limit_heap_by_allocatable_memory because that
1558 // method might reduce the allocation size.
1559 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1560 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1561 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1562 }
1563
1564 #ifdef _LP64
1565 if (UseCompressedOops || UseCompressedClassPointers) {
1566 // HeapBaseMinAddress can be greater than default but not less than.
1567 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1568 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1569 // matches compressed oops printing flags
1570 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu"
1571 " (%zuG) which is greater than value given %zu",
1572 DefaultHeapBaseMinAddress,
1573 DefaultHeapBaseMinAddress/G,
1574 HeapBaseMinAddress);
1575 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1576 }
1577 }
1578 }
1579 if (UseCompressedOops) {
1580 // Limit the heap size to the maximum possible when using compressed oops
1581 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1582
1583 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1584 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1585 // but it should be not less than default MaxHeapSize.
1586 max_coop_heap -= HeapBaseMinAddress;
1587 }
1588
1589 // If user specified flags prioritizing os physical
1590 // memory limits, then disable compressed oops if
1591 // limits exceed max_coop_heap and UseCompressedOops
1592 // was not specified.
1593 if (reasonable_max > max_coop_heap) {
1594 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1595 aot_log_info(aot)("UseCompressedOops disabled due to"
1596 " max heap %zu > compressed oop heap %zu. "
1597 "Please check the setting of MaxRAMPercentage %5.2f."
1598 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1599 FLAG_SET_ERGO(UseCompressedOops, false);
1600 } else {
1601 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1602 }
1603 }
1604 }
1605 #endif // _LP64
1606
1607 log_trace(gc, heap)(" Maximum heap size %zu", (size_t) reasonable_max);
1608 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1609 }
1610
1611 // If the minimum or initial heap_size have not been set or requested to be set
1612 // ergonomically, set them accordingly.
1613 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1614 julong reasonable_minimum = (julong)(OldSize + NewSize);
1615
1616 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1617
1618 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1619
1620 if (InitialHeapSize == 0) {
1621 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1622 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1623
1624 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1625 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1626
1627 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1628 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize);
1629 }
1630 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1631 // synchronize with InitialHeapSize to avoid errors with the default value.
1632 if (MinHeapSize == 0) {
1633 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1634 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize);
1635 }
1636 }
1637 }
1638
1639 // This option inspects the machine and attempts to set various
1640 // parameters to be optimal for long-running, memory allocation
1641 // intensive jobs. It is intended for machines with large
1642 // amounts of cpu and memory.
1643 jint Arguments::set_aggressive_heap_flags() {
1644 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1645 // VM, but we may not be able to represent the total physical memory
1646 // available (like having 8gb of memory on a box but using a 32bit VM).
1647 // Thus, we need to make sure we're using a julong for intermediate
1648 // calculations.
1649 julong initHeapSize;
1650 size_t phys_mem = os::physical_memory();
1651 julong total_memory = static_cast<julong>(phys_mem);
1652
1653 if (total_memory < (julong) 256 * M) {
1654 jio_fprintf(defaultStream::error_stream(),
1655 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1656 vm_exit(1);
1657 }
1658
1659 // The heap size is half of available memory, or (at most)
1660 // all of possible memory less 160mb (leaving room for the OS
1661 // when using ISM). This is the maximum; because adaptive sizing
1662 // is turned on below, the actual space used may be smaller.
1663
1664 initHeapSize = MIN2(total_memory / (julong) 2,
1665 total_memory - (julong) 160 * M);
1666
1667 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1668
1669 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1670 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1671 return JNI_EINVAL;
1672 }
1673 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1674 return JNI_EINVAL;
1675 }
1676 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1677 return JNI_EINVAL;
1678 }
1679 }
1680 if (FLAG_IS_DEFAULT(NewSize)) {
1681 // Make the young generation 3/8ths of the total heap.
1682 if (FLAG_SET_CMDLINE(NewSize,
1683 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1684 return JNI_EINVAL;
1685 }
1686 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1687 return JNI_EINVAL;
1688 }
1689 }
1690
1691 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1692 FLAG_SET_DEFAULT(UseLargePages, true);
1693 #endif
1694
1695 // Increase some data structure sizes for efficiency
1696 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1697 return JNI_EINVAL;
1698 }
1699 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1700 return JNI_EINVAL;
1701 }
1702
1703 // See the OldPLABSize comment below, but replace 'after promotion'
1704 // with 'after copying'. YoungPLABSize is the size of the survivor
1705 // space per-gc-thread buffers. The default is 4kw.
1706 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1707 return JNI_EINVAL;
1708 }
1709
1710 // OldPLABSize is the size of the buffers in the old gen that
1711 // UseParallelGC uses to promote live data that doesn't fit in the
1712 // survivor spaces. At any given time, there's one for each gc thread.
1713 // The default size is 1kw. These buffers are rarely used, since the
1714 // survivor spaces are usually big enough. For specjbb, however, there
1715 // are occasions when there's lots of live data in the young gen
1716 // and we end up promoting some of it. We don't have a definite
1717 // explanation for why bumping OldPLABSize helps, but the theory
1718 // is that a bigger PLAB results in retaining something like the
1719 // original allocation order after promotion, which improves mutator
1720 // locality. A minor effect may be that larger PLABs reduce the
1721 // number of PLAB allocation events during gc. The value of 8kw
1722 // was arrived at by experimenting with specjbb.
1723 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1724 return JNI_EINVAL;
1725 }
1726
1727 // Enable parallel GC and adaptive generation sizing
1728 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1729 return JNI_EINVAL;
1730 }
1731
1732 // Encourage steady state memory management
1733 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1734 return JNI_EINVAL;
1735 }
1736
1737 return JNI_OK;
1738 }
1739
1740 // This must be called after ergonomics.
1741 void Arguments::set_bytecode_flags() {
1742 if (!RewriteBytecodes) {
1743 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1744 }
1745 }
1746
1747 // Aggressive optimization flags
1748 jint Arguments::set_aggressive_opts_flags() {
1749 #ifdef COMPILER2
1750 if (AggressiveUnboxing) {
1751 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1752 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1753 } else if (!EliminateAutoBox) {
1754 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1755 AggressiveUnboxing = false;
1756 }
1757 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1758 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1759 } else if (!DoEscapeAnalysis) {
1760 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1761 AggressiveUnboxing = false;
1762 }
1763 }
1764 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1765 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1766 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1767 }
1768 // Feed the cache size setting into the JDK
1769 char buffer[1024];
1770 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1771 if (!add_property(buffer)) {
1772 return JNI_ENOMEM;
1773 }
1774 }
1775 #endif
1776
1777 return JNI_OK;
1778 }
1779
1780 //===========================================================================================================
1781
1782 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1783 if (_sun_java_launcher != _default_java_launcher) {
1784 os::free(const_cast<char*>(_sun_java_launcher));
1785 }
1786 _sun_java_launcher = os::strdup_check_oom(launcher);
1787 }
1788
1789 bool Arguments::created_by_java_launcher() {
1790 assert(_sun_java_launcher != nullptr, "property must have value");
1791 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1792 }
1793
1794 bool Arguments::executing_unit_tests() {
1795 return _executing_unit_tests;
1796 }
1797
1798 //===========================================================================================================
1799 // Parsing of main arguments
1800
1801 static unsigned int addreads_count = 0;
1802 static unsigned int addexports_count = 0;
1803 static unsigned int addopens_count = 0;
1804 static unsigned int patch_mod_count = 0;
1805 static unsigned int enable_native_access_count = 0;
1806 static bool patch_mod_javabase = false;
1807
1808 // Check the consistency of vm_init_args
1809 bool Arguments::check_vm_args_consistency() {
1810 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1811 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
1812 return false;
1813 }
1814
1815 // Method for adding checks for flag consistency.
1816 // The intent is to warn the user of all possible conflicts,
1817 // before returning an error.
1818 // Note: Needs platform-dependent factoring.
1819 bool status = true;
1820
1821 if (TLABRefillWasteFraction == 0) {
1822 jio_fprintf(defaultStream::error_stream(),
1823 "TLABRefillWasteFraction should be a denominator, "
1824 "not %zu\n",
1825 TLABRefillWasteFraction);
1826 status = false;
1827 }
1828
1829 status = CompilerConfig::check_args_consistency(status);
1830 #if INCLUDE_JVMCI
1831 if (status && EnableJVMCI) {
1832 // Add the JVMCI module if not using libjvmci or EnableJVMCI
1833 // was explicitly set on the command line or in the jimage.
1834 if ((!UseJVMCINativeLibrary || FLAG_IS_CMDLINE(EnableJVMCI) || FLAG_IS_JIMAGE_RESOURCE(EnableJVMCI)) && ClassLoader::is_module_observable("jdk.internal.vm.ci") && !_jvmci_module_added) {
1835 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1836 return false;
1837 }
1838 }
1839 }
1840 #endif
1841
1842 #if INCLUDE_JFR
1843 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1844 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1845 return false;
1846 }
1847 }
1848 #endif
1849
1850 #ifndef SUPPORT_RESERVED_STACK_AREA
1851 if (StackReservedPages != 0) {
1852 FLAG_SET_CMDLINE(StackReservedPages, 0);
1853 warning("Reserved Stack Area not supported on this platform");
1854 }
1855 #endif
1856
1857 if (UseObjectMonitorTable && LockingMode != LM_LIGHTWEIGHT) {
1858 // ObjectMonitorTable requires lightweight locking.
1859 FLAG_SET_CMDLINE(UseObjectMonitorTable, false);
1860 warning("UseObjectMonitorTable requires LM_LIGHTWEIGHT");
1861 }
1862
1863 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1864 if (LockingMode == LM_MONITOR) {
1865 jio_fprintf(defaultStream::error_stream(),
1866 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1867 return false;
1868 }
1869 #endif
1870 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1871 jio_fprintf(defaultStream::error_stream(),
1872 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1873 return false;
1874 }
1875 return status;
1876 }
1877
1878 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1879 const char* option_type) {
1880 if (ignore) return false;
1881
1882 const char* spacer = " ";
1883 if (option_type == nullptr) {
1884 option_type = ++spacer; // Set both to the empty string.
1885 }
1886
1887 jio_fprintf(defaultStream::error_stream(),
1888 "Unrecognized %s%soption: %s\n", option_type, spacer,
1889 option->optionString);
1890 return true;
1891 }
1892
1893 static const char* user_assertion_options[] = {
1894 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1895 };
1896
1897 static const char* system_assertion_options[] = {
1898 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1899 };
1900
1901 bool Arguments::parse_uint(const char* value,
1902 uint* uint_arg,
1903 uint min_size) {
1904 uint n;
1905 if (!parse_integer(value, &n)) {
1906 return false;
1907 }
1908 if (n >= min_size) {
1909 *uint_arg = n;
1910 return true;
1911 } else {
1912 return false;
1913 }
1914 }
1915
1916 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1917 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1918 CDSConfig::check_internal_module_property(prop_name, prop_value);
1919 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1920 char* property = AllocateHeap(prop_len, mtArguments);
1921 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1922 if (ret < 0 || ret >= (int)prop_len) {
1923 FreeHeap(property);
1924 return false;
1925 }
1926 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1927 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1928 // that multiple occurrences of the associated flag just causes the existing property value to be
1929 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1930 // to a property after we have finished flag processing.
1931 bool added = add_property(property, WriteableProperty, internal);
1932 FreeHeap(property);
1933 return added;
1934 }
1935
1936 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1937 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1938 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1939 const unsigned int props_count_limit = 1000;
1940 const int max_digits = 3;
1941 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1942
1943 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1944 if (count < props_count_limit) {
1945 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1946 char* property = AllocateHeap(prop_len, mtArguments);
1947 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1948 if (ret < 0 || ret >= (int)prop_len) {
1949 FreeHeap(property);
1950 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1951 return false;
1952 }
1953 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1954 FreeHeap(property);
1955 return added;
1956 }
1957
1958 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1959 return false;
1960 }
1961
1962 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1963 julong* long_arg,
1964 julong min_size,
1965 julong max_size) {
1966 if (!parse_integer(s, long_arg)) return arg_unreadable;
1967 return check_memory_size(*long_arg, min_size, max_size);
1968 }
1969
1970 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) {
1971 // Save default settings for some mode flags
1972 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1973 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1974 Arguments::_ClipInlining = ClipInlining;
1975 Arguments::_BackgroundCompilation = BackgroundCompilation;
1976
1977 // Remember the default value of SharedBaseAddress.
1978 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1979
1980 // Setup flags for mixed which is the default
1981 set_mode_flags(_mixed);
1982
1983 jint result;
1984 for (int i = 0; i < all_args->length(); i++) {
1985 result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin);
1986 if (result != JNI_OK) {
1987 return result;
1988 }
1989 }
1990
1991 // Disable CDS for exploded image
1992 if (!has_jimage()) {
1993 no_shared_spaces("CDS disabled on exploded JDK");
1994 }
1995
1996 // We need to ensure processor and memory resources have been properly
1997 // configured - which may rely on arguments we just processed - before
1998 // doing the final argument processing. Any argument processing that
1999 // needs to know about processor and memory resources must occur after
2000 // this point.
2001
2002 os::init_container_support();
2003
2004 SystemMemoryBarrier::initialize();
2005
2006 // Do final processing now that all arguments have been parsed
2007 result = finalize_vm_init_args();
2008 if (result != JNI_OK) {
2009 return result;
2010 }
2011
2012 return JNI_OK;
2013 }
2014
2015 #if !INCLUDE_JVMTI || INCLUDE_CDS
2016 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2017 // represents a valid JDWP agent. is_path==true denotes that we
2018 // are dealing with -agentpath (case where name is a path), otherwise with
2019 // -agentlib
2020 static bool valid_jdwp_agent(char *name, bool is_path) {
2021 char *_name;
2022 const char *_jdwp = "jdwp";
2023 size_t _len_jdwp, _len_prefix;
2024
2025 if (is_path) {
2026 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2027 return false;
2028 }
2029
2030 _name++; // skip past last path separator
2031 _len_prefix = strlen(JNI_LIB_PREFIX);
2032
2033 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2034 return false;
2035 }
2036
2037 _name += _len_prefix;
2038 _len_jdwp = strlen(_jdwp);
2039
2040 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2041 _name += _len_jdwp;
2042 }
2043 else {
2044 return false;
2045 }
2046
2047 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2048 return false;
2049 }
2050
2051 return true;
2052 }
2053
2054 if (strcmp(name, _jdwp) == 0) {
2055 return true;
2056 }
2057
2058 return false;
2059 }
2060 #endif
2061
2062 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2063 // --patch-module=<module>=<file>(<pathsep><file>)*
2064 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2065 // Find the equal sign between the module name and the path specification
2066 const char* module_equal = strchr(patch_mod_tail, '=');
2067 if (module_equal == nullptr) {
2068 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2069 return JNI_ERR;
2070 } else {
2071 // Pick out the module name
2072 size_t module_len = module_equal - patch_mod_tail;
2073 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2074 if (module_name != nullptr) {
2075 memcpy(module_name, patch_mod_tail, module_len);
2076 *(module_name + module_len) = '\0';
2077 // The path piece begins one past the module_equal sign
2078 add_patch_mod_prefix(module_name, module_equal + 1);
2079 FREE_C_HEAP_ARRAY(char, module_name);
2080 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2081 return JNI_ENOMEM;
2082 }
2083 } else {
2084 return JNI_ENOMEM;
2085 }
2086 }
2087 return JNI_OK;
2088 }
2089
2090 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2091 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2092 // The min and max sizes match the values in globals.hpp, but scaled
2093 // with K. The values have been chosen so that alignment with page
2094 // size doesn't change the max value, which makes the conversions
2095 // back and forth between Xss value and ThreadStackSize value easier.
2096 // The values have also been chosen to fit inside a 32-bit signed type.
2097 const julong min_ThreadStackSize = 0;
2098 const julong max_ThreadStackSize = 1 * M;
2099
2100 // Make sure the above values match the range set in globals.hpp
2101 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2102 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2103 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2104
2105 const julong min_size = min_ThreadStackSize * K;
2106 const julong max_size = max_ThreadStackSize * K;
2107
2108 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2109
2110 julong size = 0;
2111 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2112 if (errcode != arg_in_range) {
2113 bool silent = (option == nullptr); // Allow testing to silence error messages
2114 if (!silent) {
2115 jio_fprintf(defaultStream::error_stream(),
2116 "Invalid thread stack size: %s\n", option->optionString);
2117 describe_range_error(errcode);
2118 }
2119 return JNI_EINVAL;
2120 }
2121
2122 // Internally track ThreadStackSize in units of 1024 bytes.
2123 const julong size_aligned = align_up(size, K);
2124 assert(size <= size_aligned,
2125 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2126 size, size_aligned);
2127
2128 const julong size_in_K = size_aligned / K;
2129 assert(size_in_K < (julong)max_intx,
2130 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2131 size_in_K);
2132
2133 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2134 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2135 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2136 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2137 max_expanded, size_in_K);
2138
2139 *out_ThreadStackSize = (intx)size_in_K;
2140
2141 return JNI_OK;
2142 }
2143
2144 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2145 // For match_option to return remaining or value part of option string
2146 const char* tail;
2147
2148 // iterate over arguments
2149 for (int index = 0; index < args->nOptions; index++) {
2150 bool is_absolute_path = false; // for -agentpath vs -agentlib
2151
2152 const JavaVMOption* option = args->options + index;
2153
2154 if (!match_option(option, "-Djava.class.path", &tail) &&
2155 !match_option(option, "-Dsun.java.command", &tail) &&
2156 !match_option(option, "-Dsun.java.launcher", &tail)) {
2157
2158 // add all jvm options to the jvm_args string. This string
2159 // is used later to set the java.vm.args PerfData string constant.
2160 // the -Djava.class.path and the -Dsun.java.command options are
2161 // omitted from jvm_args string as each have their own PerfData
2162 // string constant object.
2163 build_jvm_args(option->optionString);
2164 }
2165
2166 // -verbose:[class/module/gc/jni]
2167 if (match_option(option, "-verbose", &tail)) {
2168 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2169 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2170 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2171 } else if (!strcmp(tail, ":module")) {
2172 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2173 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2174 } else if (!strcmp(tail, ":gc")) {
2175 if (_legacyGCLogging.lastFlag == 0) {
2176 _legacyGCLogging.lastFlag = 1;
2177 }
2178 } else if (!strcmp(tail, ":jni")) {
2179 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2180 }
2181 // -da / -ea / -disableassertions / -enableassertions
2182 // These accept an optional class/package name separated by a colon, e.g.,
2183 // -da:java.lang.Thread.
2184 } else if (match_option(option, user_assertion_options, &tail, true)) {
2185 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2186 if (*tail == '\0') {
2187 JavaAssertions::setUserClassDefault(enable);
2188 } else {
2189 assert(*tail == ':', "bogus match by match_option()");
2190 JavaAssertions::addOption(tail + 1, enable);
2191 }
2192 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2193 } else if (match_option(option, system_assertion_options, &tail, false)) {
2194 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2195 JavaAssertions::setSystemClassDefault(enable);
2196 // -bootclasspath:
2197 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2198 jio_fprintf(defaultStream::output_stream(),
2199 "-Xbootclasspath is no longer a supported option.\n");
2200 return JNI_EINVAL;
2201 // -bootclasspath/a:
2202 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2203 Arguments::append_sysclasspath(tail);
2204 // -bootclasspath/p:
2205 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2206 jio_fprintf(defaultStream::output_stream(),
2207 "-Xbootclasspath/p is no longer a supported option.\n");
2208 return JNI_EINVAL;
2209 // -Xrun
2210 } else if (match_option(option, "-Xrun", &tail)) {
2211 if (tail != nullptr) {
2212 const char* pos = strchr(tail, ':');
2213 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2214 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2215 jio_snprintf(name, len + 1, "%s", tail);
2216
2217 char *options = nullptr;
2218 if(pos != nullptr) {
2219 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2220 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2221 }
2222 #if !INCLUDE_JVMTI
2223 if (strcmp(name, "jdwp") == 0) {
2224 jio_fprintf(defaultStream::error_stream(),
2225 "Debugging agents are not supported in this VM\n");
2226 return JNI_ERR;
2227 }
2228 #endif // !INCLUDE_JVMTI
2229 JvmtiAgentList::add_xrun(name, options, false);
2230 FREE_C_HEAP_ARRAY(char, name);
2231 FREE_C_HEAP_ARRAY(char, options);
2232 }
2233 } else if (match_option(option, "--add-reads=", &tail)) {
2234 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2235 return JNI_ENOMEM;
2236 }
2237 } else if (match_option(option, "--add-exports=", &tail)) {
2238 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2239 return JNI_ENOMEM;
2240 }
2241 } else if (match_option(option, "--add-opens=", &tail)) {
2242 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2243 return JNI_ENOMEM;
2244 }
2245 } else if (match_option(option, "--add-modules=", &tail)) {
2246 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2247 return JNI_ENOMEM;
2248 }
2249 #if INCLUDE_JVMCI
2250 if (!_jvmci_module_added) {
2251 const char *jvmci_module = strstr(tail, "jdk.internal.vm.ci");
2252 if (jvmci_module != nullptr) {
2253 char before = *(jvmci_module - 1);
2254 char after = *(jvmci_module + strlen("jdk.internal.vm.ci"));
2255 if ((before == '=' || before == ',') && (after == '\0' || after == ',')) {
2256 FLAG_SET_DEFAULT(EnableJVMCI, true);
2257 _jvmci_module_added = true;
2258 }
2259 }
2260 }
2261 #endif
2262 } else if (match_option(option, "--enable-native-access=", &tail)) {
2263 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2264 return JNI_ENOMEM;
2265 }
2266 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2267 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2268 return JNI_ENOMEM;
2269 }
2270 } else if (match_option(option, "--limit-modules=", &tail)) {
2271 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2272 return JNI_ENOMEM;
2273 }
2274 } else if (match_option(option, "--module-path=", &tail)) {
2275 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2276 return JNI_ENOMEM;
2277 }
2278 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2279 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2280 return JNI_ENOMEM;
2281 }
2282 } else if (match_option(option, "--patch-module=", &tail)) {
2283 // --patch-module=<module>=<file>(<pathsep><file>)*
2284 int res = process_patch_mod_option(tail);
2285 if (res != JNI_OK) {
2286 return res;
2287 }
2288 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2289 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2290 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2291 AddProperty, WriteableProperty, InternalProperty);
2292 } else {
2293 jio_fprintf(defaultStream::error_stream(),
2294 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2295 return JNI_ERR;
2296 }
2297 } else if (match_option(option, "--illegal-access=", &tail)) {
2298 char version[256];
2299 JDK_Version::jdk(17).to_string(version, sizeof(version));
2300 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2301 // -agentlib and -agentpath
2302 } else if (match_option(option, "-agentlib:", &tail) ||
2303 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2304 if(tail != nullptr) {
2305 const char* pos = strchr(tail, '=');
2306 char* name;
2307 if (pos == nullptr) {
2308 name = os::strdup_check_oom(tail, mtArguments);
2309 } else {
2310 size_t len = pos - tail;
2311 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2312 memcpy(name, tail, len);
2313 name[len] = '\0';
2314 }
2315
2316 char *options = nullptr;
2317 if(pos != nullptr) {
2318 options = os::strdup_check_oom(pos + 1, mtArguments);
2319 }
2320 #if !INCLUDE_JVMTI
2321 if (valid_jdwp_agent(name, is_absolute_path)) {
2322 jio_fprintf(defaultStream::error_stream(),
2323 "Debugging agents are not supported in this VM\n");
2324 return JNI_ERR;
2325 }
2326 #elif INCLUDE_CDS
2327 if (valid_jdwp_agent(name, is_absolute_path)) {
2328 _has_jdwp_agent = true;
2329 }
2330 #endif // !INCLUDE_JVMTI
2331 JvmtiAgentList::add(name, options, is_absolute_path);
2332 os::free(name);
2333 os::free(options);
2334 }
2335 // -javaagent
2336 } else if (match_option(option, "-javaagent:", &tail)) {
2337 #if !INCLUDE_JVMTI
2338 jio_fprintf(defaultStream::error_stream(),
2339 "Instrumentation agents are not supported in this VM\n");
2340 return JNI_ERR;
2341 #else
2342 if (tail != nullptr) {
2343 size_t length = strlen(tail) + 1;
2344 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2345 jio_snprintf(options, length, "%s", tail);
2346 JvmtiAgentList::add("instrument", options, false);
2347 FREE_C_HEAP_ARRAY(char, options);
2348
2349 // java agents need module java.instrument
2350 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2351 return JNI_ENOMEM;
2352 }
2353 }
2354 #endif // !INCLUDE_JVMTI
2355 // --enable_preview
2356 } else if (match_option(option, "--enable-preview")) {
2357 set_enable_preview();
2358 // -Xnoclassgc
2359 } else if (match_option(option, "-Xnoclassgc")) {
2360 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2361 return JNI_EINVAL;
2362 }
2363 // -Xbatch
2364 } else if (match_option(option, "-Xbatch")) {
2365 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2366 return JNI_EINVAL;
2367 }
2368 // -Xmn for compatibility with other JVM vendors
2369 } else if (match_option(option, "-Xmn", &tail)) {
2370 julong long_initial_young_size = 0;
2371 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2372 if (errcode != arg_in_range) {
2373 jio_fprintf(defaultStream::error_stream(),
2374 "Invalid initial young generation size: %s\n", option->optionString);
2375 describe_range_error(errcode);
2376 return JNI_EINVAL;
2377 }
2378 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2379 return JNI_EINVAL;
2380 }
2381 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2382 return JNI_EINVAL;
2383 }
2384 // -Xms
2385 } else if (match_option(option, "-Xms", &tail)) {
2386 julong size = 0;
2387 // an initial heap size of 0 means automatically determine
2388 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2389 if (errcode != arg_in_range) {
2390 jio_fprintf(defaultStream::error_stream(),
2391 "Invalid initial heap size: %s\n", option->optionString);
2392 describe_range_error(errcode);
2393 return JNI_EINVAL;
2394 }
2395 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2396 return JNI_EINVAL;
2397 }
2398 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2399 return JNI_EINVAL;
2400 }
2401 // -Xmx
2402 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2403 julong long_max_heap_size = 0;
2404 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2405 if (errcode != arg_in_range) {
2406 jio_fprintf(defaultStream::error_stream(),
2407 "Invalid maximum heap size: %s\n", option->optionString);
2408 describe_range_error(errcode);
2409 return JNI_EINVAL;
2410 }
2411 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2412 return JNI_EINVAL;
2413 }
2414 // Xmaxf
2415 } else if (match_option(option, "-Xmaxf", &tail)) {
2416 char* err;
2417 int maxf = (int)(strtod(tail, &err) * 100);
2418 if (*err != '\0' || *tail == '\0') {
2419 jio_fprintf(defaultStream::error_stream(),
2420 "Bad max heap free percentage size: %s\n",
2421 option->optionString);
2422 return JNI_EINVAL;
2423 } else {
2424 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2425 return JNI_EINVAL;
2426 }
2427 }
2428 // Xminf
2429 } else if (match_option(option, "-Xminf", &tail)) {
2430 char* err;
2431 int minf = (int)(strtod(tail, &err) * 100);
2432 if (*err != '\0' || *tail == '\0') {
2433 jio_fprintf(defaultStream::error_stream(),
2434 "Bad min heap free percentage size: %s\n",
2435 option->optionString);
2436 return JNI_EINVAL;
2437 } else {
2438 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2439 return JNI_EINVAL;
2440 }
2441 }
2442 // -Xss
2443 } else if (match_option(option, "-Xss", &tail)) {
2444 intx value = 0;
2445 jint err = parse_xss(option, tail, &value);
2446 if (err != JNI_OK) {
2447 return err;
2448 }
2449 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2450 return JNI_EINVAL;
2451 }
2452 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2453 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2454 julong long_ReservedCodeCacheSize = 0;
2455
2456 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2457 if (errcode != arg_in_range) {
2458 jio_fprintf(defaultStream::error_stream(),
2459 "Invalid maximum code cache size: %s.\n", option->optionString);
2460 return JNI_EINVAL;
2461 }
2462 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2463 return JNI_EINVAL;
2464 }
2465 // -green
2466 } else if (match_option(option, "-green")) {
2467 jio_fprintf(defaultStream::error_stream(),
2468 "Green threads support not available\n");
2469 return JNI_EINVAL;
2470 // -native
2471 } else if (match_option(option, "-native")) {
2472 // HotSpot always uses native threads, ignore silently for compatibility
2473 // -Xrs
2474 } else if (match_option(option, "-Xrs")) {
2475 // Classic/EVM option, new functionality
2476 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2477 return JNI_EINVAL;
2478 }
2479 // -Xprof
2480 } else if (match_option(option, "-Xprof")) {
2481 char version[256];
2482 // Obsolete in JDK 10
2483 JDK_Version::jdk(10).to_string(version, sizeof(version));
2484 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2485 // -Xinternalversion
2486 } else if (match_option(option, "-Xinternalversion")) {
2487 jio_fprintf(defaultStream::output_stream(), "%s\n",
2488 VM_Version::internal_vm_info_string());
2489 vm_exit(0);
2490 #ifndef PRODUCT
2491 // -Xprintflags
2492 } else if (match_option(option, "-Xprintflags")) {
2493 JVMFlag::printFlags(tty, false);
2494 vm_exit(0);
2495 #endif
2496 // -D
2497 } else if (match_option(option, "-D", &tail)) {
2498 const char* value;
2499 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2500 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2501 // abort if -Djava.endorsed.dirs is set
2502 jio_fprintf(defaultStream::output_stream(),
2503 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2504 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2505 return JNI_EINVAL;
2506 }
2507 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2508 *value != '\0' && strcmp(value, "\"\"") != 0) {
2509 // abort if -Djava.ext.dirs is set
2510 jio_fprintf(defaultStream::output_stream(),
2511 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2512 return JNI_EINVAL;
2513 }
2514 // Check for module related properties. They must be set using the modules
2515 // options. For example: use "--add-modules=java.sql", not
2516 // "-Djdk.module.addmods=java.sql"
2517 if (is_internal_module_property(option->optionString + 2)) {
2518 needs_module_property_warning = true;
2519 continue;
2520 }
2521 if (!add_property(tail)) {
2522 return JNI_ENOMEM;
2523 }
2524 // Out of the box management support
2525 if (match_option(option, "-Dcom.sun.management", &tail)) {
2526 #if INCLUDE_MANAGEMENT
2527 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2528 return JNI_EINVAL;
2529 }
2530 // management agent in module jdk.management.agent
2531 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2532 return JNI_ENOMEM;
2533 }
2534 #else
2535 jio_fprintf(defaultStream::output_stream(),
2536 "-Dcom.sun.management is not supported in this VM.\n");
2537 return JNI_ERR;
2538 #endif
2539 }
2540 // -Xint
2541 } else if (match_option(option, "-Xint")) {
2542 set_mode_flags(_int);
2543 mode_flag_cmd_line = true;
2544 // -Xmixed
2545 } else if (match_option(option, "-Xmixed")) {
2546 set_mode_flags(_mixed);
2547 mode_flag_cmd_line = true;
2548 // -Xcomp
2549 } else if (match_option(option, "-Xcomp")) {
2550 // for testing the compiler; turn off all flags that inhibit compilation
2551 set_mode_flags(_comp);
2552 mode_flag_cmd_line = true;
2553 // -Xshare:dump
2554 } else if (match_option(option, "-Xshare:dump")) {
2555 CDSConfig::enable_dumping_static_archive();
2556 CDSConfig::set_old_cds_flags_used();
2557 // -Xshare:on
2558 } else if (match_option(option, "-Xshare:on")) {
2559 UseSharedSpaces = true;
2560 RequireSharedSpaces = true;
2561 CDSConfig::set_old_cds_flags_used();
2562 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2563 } else if (match_option(option, "-Xshare:auto")) {
2564 UseSharedSpaces = true;
2565 RequireSharedSpaces = false;
2566 xshare_auto_cmd_line = true;
2567 CDSConfig::set_old_cds_flags_used();
2568 // -Xshare:off
2569 } else if (match_option(option, "-Xshare:off")) {
2570 UseSharedSpaces = false;
2571 RequireSharedSpaces = false;
2572 CDSConfig::set_old_cds_flags_used();
2573 // -Xverify
2574 } else if (match_option(option, "-Xverify", &tail)) {
2575 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2576 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2577 return JNI_EINVAL;
2578 }
2579 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2580 return JNI_EINVAL;
2581 }
2582 } else if (strcmp(tail, ":remote") == 0) {
2583 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2584 return JNI_EINVAL;
2585 }
2586 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2587 return JNI_EINVAL;
2588 }
2589 } else if (strcmp(tail, ":none") == 0) {
2590 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2591 return JNI_EINVAL;
2592 }
2593 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2594 return JNI_EINVAL;
2595 }
2596 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2597 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2598 return JNI_EINVAL;
2599 }
2600 // -Xdebug
2601 } else if (match_option(option, "-Xdebug")) {
2602 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2603 } else if (match_option(option, "-Xloggc:", &tail)) {
2604 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2605 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2606 _legacyGCLogging.lastFlag = 2;
2607 _legacyGCLogging.file = os::strdup_check_oom(tail);
2608 } else if (match_option(option, "-Xlog", &tail)) {
2609 bool ret = false;
2610 if (strcmp(tail, ":help") == 0) {
2611 fileStream stream(defaultStream::output_stream());
2612 LogConfiguration::print_command_line_help(&stream);
2613 vm_exit(0);
2614 } else if (strcmp(tail, ":disable") == 0) {
2615 LogConfiguration::disable_logging();
2616 ret = true;
2617 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2618 const char* async_tail = tail + strlen(":async");
2619 ret = LogConfiguration::parse_async_argument(async_tail);
2620 } else if (*tail == '\0') {
2621 ret = LogConfiguration::parse_command_line_arguments();
2622 assert(ret, "-Xlog without arguments should never fail to parse");
2623 } else if (*tail == ':') {
2624 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2625 }
2626 if (ret == false) {
2627 jio_fprintf(defaultStream::error_stream(),
2628 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2629 tail);
2630 return JNI_EINVAL;
2631 }
2632 // JNI hooks
2633 } else if (match_option(option, "-Xcheck", &tail)) {
2634 if (!strcmp(tail, ":jni")) {
2635 #if !INCLUDE_JNI_CHECK
2636 warning("JNI CHECKING is not supported in this VM");
2637 #else
2638 CheckJNICalls = true;
2639 #endif // INCLUDE_JNI_CHECK
2640 } else if (is_bad_option(option, args->ignoreUnrecognized,
2641 "check")) {
2642 return JNI_EINVAL;
2643 }
2644 } else if (match_option(option, "vfprintf")) {
2645 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2646 } else if (match_option(option, "exit")) {
2647 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2648 } else if (match_option(option, "abort")) {
2649 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2650 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2651 // and the last option wins.
2652 } else if (match_option(option, "-XX:+NeverTenure")) {
2653 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2654 return JNI_EINVAL;
2655 }
2656 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2657 return JNI_EINVAL;
2658 }
2659 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2660 return JNI_EINVAL;
2661 }
2662 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2663 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2664 return JNI_EINVAL;
2665 }
2666 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2667 return JNI_EINVAL;
2668 }
2669 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2670 return JNI_EINVAL;
2671 }
2672 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2673 uint max_tenuring_thresh = 0;
2674 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2675 jio_fprintf(defaultStream::error_stream(),
2676 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2677 return JNI_EINVAL;
2678 }
2679
2680 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2681 return JNI_EINVAL;
2682 }
2683
2684 if (MaxTenuringThreshold == 0) {
2685 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2686 return JNI_EINVAL;
2687 }
2688 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2689 return JNI_EINVAL;
2690 }
2691 } else {
2692 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2693 return JNI_EINVAL;
2694 }
2695 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2696 return JNI_EINVAL;
2697 }
2698 }
2699 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2700 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2701 return JNI_EINVAL;
2702 }
2703 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2704 return JNI_EINVAL;
2705 }
2706 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2707 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2708 return JNI_EINVAL;
2709 }
2710 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2711 return JNI_EINVAL;
2712 }
2713 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2714 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2715 return JNI_EINVAL;
2716 }
2717 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2718 return JNI_EINVAL;
2719 }
2720 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2721 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2722 return JNI_EINVAL;
2723 }
2724 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2725 return JNI_EINVAL;
2726 }
2727 } else if (match_option(option, "--finalization=", &tail)) {
2728 if (strcmp(tail, "enabled") == 0) {
2729 InstanceKlass::set_finalization_enabled(true);
2730 } else if (strcmp(tail, "disabled") == 0) {
2731 InstanceKlass::set_finalization_enabled(false);
2732 } else {
2733 jio_fprintf(defaultStream::error_stream(),
2734 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2735 tail);
2736 return JNI_EINVAL;
2737 }
2738 #if !defined(DTRACE_ENABLED)
2739 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2740 jio_fprintf(defaultStream::error_stream(),
2741 "DTraceMethodProbes flag is not applicable for this configuration\n");
2742 return JNI_EINVAL;
2743 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2744 jio_fprintf(defaultStream::error_stream(),
2745 "DTraceAllocProbes flag is not applicable for this configuration\n");
2746 return JNI_EINVAL;
2747 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2748 jio_fprintf(defaultStream::error_stream(),
2749 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2750 return JNI_EINVAL;
2751 #endif // !defined(DTRACE_ENABLED)
2752 #ifdef ASSERT
2753 } else if (match_option(option, "-XX:+FullGCALot")) {
2754 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2755 return JNI_EINVAL;
2756 }
2757 #endif
2758 #if !INCLUDE_MANAGEMENT
2759 } else if (match_option(option, "-XX:+ManagementServer")) {
2760 jio_fprintf(defaultStream::error_stream(),
2761 "ManagementServer is not supported in this VM.\n");
2762 return JNI_ERR;
2763 #endif // INCLUDE_MANAGEMENT
2764 #if INCLUDE_JVMCI
2765 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2766 if (EnableJVMCIProduct) {
2767 jio_fprintf(defaultStream::error_stream(),
2768 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2769 return JNI_EINVAL;
2770 }
2771 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2772 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2773 if (use_graal_jit) {
2774 const char* jvmci_compiler = get_property("jvmci.Compiler");
2775 if (jvmci_compiler != nullptr) {
2776 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2777 jio_fprintf(defaultStream::error_stream(),
2778 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2779 return JNI_ERR;
2780 }
2781 } else if (!add_property("jvmci.Compiler=graal")) {
2782 return JNI_ENOMEM;
2783 }
2784 }
2785
2786 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2787 if (EnableJVMCIProduct) {
2788 continue;
2789 }
2790 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2791 // Allow this flag if it has been unlocked.
2792 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2793 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2794 jio_fprintf(defaultStream::error_stream(),
2795 "Unable to enable JVMCI in product mode\n");
2796 return JNI_ERR;
2797 }
2798 }
2799 // The flag was locked so process normally to report that error
2800 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2801 return JNI_EINVAL;
2802 }
2803 #endif // INCLUDE_JVMCI
2804 #if INCLUDE_JFR
2805 } else if (match_jfr_option(&option)) {
2806 return JNI_EINVAL;
2807 #endif
2808 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2809 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2810 // already been handled
2811 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2812 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2813 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2814 return JNI_EINVAL;
2815 }
2816 }
2817 // Unknown option
2818 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2819 return JNI_ERR;
2820 }
2821 }
2822
2823 // PrintSharedArchiveAndExit will turn on
2824 // -Xshare:on
2825 // -Xlog:class+path=info
2826 if (PrintSharedArchiveAndExit) {
2827 UseSharedSpaces = true;
2828 RequireSharedSpaces = true;
2829 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2830 }
2831
2832 fix_appclasspath();
2833
2834 return JNI_OK;
2835 }
2836
2837 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) {
2838 // For java.base check for duplicate --patch-module options being specified on the command line.
2839 // This check is only required for java.base, all other duplicate module specifications
2840 // will be checked during module system initialization. The module system initialization
2841 // will throw an ExceptionInInitializerError if this situation occurs.
2842 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2843 if (patch_mod_javabase) {
2844 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2845 } else {
2846 patch_mod_javabase = true;
2847 }
2848 }
2849
2850 // Create GrowableArray lazily, only if --patch-module has been specified
2851 if (_patch_mod_prefix == nullptr) {
2852 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2853 }
2854
2855 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2856 }
2857
2858 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2859 //
2860 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2861 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2862 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2863 // path is treated as the current directory.
2864 //
2865 // This causes problems with CDS, which requires that all directories specified in the classpath
2866 // must be empty. In most cases, applications do NOT want to load classes from the current
2867 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2868 // scripts compatible with CDS.
2869 void Arguments::fix_appclasspath() {
2870 if (IgnoreEmptyClassPaths) {
2871 const char separator = *os::path_separator();
2872 const char* src = _java_class_path->value();
2873
2874 // skip over all the leading empty paths
2875 while (*src == separator) {
2876 src ++;
2877 }
2878
2879 char* copy = os::strdup_check_oom(src, mtArguments);
2880
2881 // trim all trailing empty paths
2882 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2883 *tail = '\0';
2884 }
2885
2886 char from[3] = {separator, separator, '\0'};
2887 char to [2] = {separator, '\0'};
2888 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2889 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2890 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2891 }
2892
2893 _java_class_path->set_writeable_value(copy);
2894 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2895 }
2896 }
2897
2898 jint Arguments::finalize_vm_init_args() {
2899 // check if the default lib/endorsed directory exists; if so, error
2900 char path[JVM_MAXPATHLEN];
2901 const char* fileSep = os::file_separator();
2902 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2903
2904 DIR* dir = os::opendir(path);
2905 if (dir != nullptr) {
2906 jio_fprintf(defaultStream::output_stream(),
2907 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2908 "in modular form will be supported via the concept of upgradeable modules.\n");
2909 os::closedir(dir);
2910 return JNI_ERR;
2911 }
2912
2913 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2914 dir = os::opendir(path);
2915 if (dir != nullptr) {
2916 jio_fprintf(defaultStream::output_stream(),
2917 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2918 "Use -classpath instead.\n.");
2919 os::closedir(dir);
2920 return JNI_ERR;
2921 }
2922
2923 // This must be done after all arguments have been processed
2924 // and the container support has been initialized since AggressiveHeap
2925 // relies on the amount of total memory available.
2926 if (AggressiveHeap) {
2927 jint result = set_aggressive_heap_flags();
2928 if (result != JNI_OK) {
2929 return result;
2930 }
2931 }
2932
2933 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2934 // but like -Xint, leave compilation thresholds unaffected.
2935 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2936 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2937 set_mode_flags(_int);
2938 }
2939
2940 #ifdef ZERO
2941 // Zero always runs in interpreted mode
2942 set_mode_flags(_int);
2943 #endif
2944
2945 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2946 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2947 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2948 }
2949
2950 #if !COMPILER2_OR_JVMCI
2951 // Don't degrade server performance for footprint
2952 if (FLAG_IS_DEFAULT(UseLargePages) &&
2953 MaxHeapSize < LargePageHeapSizeThreshold) {
2954 // No need for large granularity pages w/small heaps.
2955 // Note that large pages are enabled/disabled for both the
2956 // Java heap and the code cache.
2957 FLAG_SET_DEFAULT(UseLargePages, false);
2958 }
2959
2960 UNSUPPORTED_OPTION(ProfileInterpreter);
2961 #endif
2962
2963 // Parse the CompilationMode flag
2964 if (!CompilationModeFlag::initialize()) {
2965 return JNI_ERR;
2966 }
2967
2968 if (!check_vm_args_consistency()) {
2969 return JNI_ERR;
2970 }
2971
2972
2973 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2974 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2975 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2976
2977 return JNI_OK;
2978 }
2979
2980 // Helper class for controlling the lifetime of JavaVMInitArgs
2981 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2982 // deleted on the destruction of the ScopedVMInitArgs object.
2983 class ScopedVMInitArgs : public StackObj {
2984 private:
2985 JavaVMInitArgs _args;
2986 char* _container_name;
2987 bool _is_set;
2988 char* _vm_options_file_arg;
2989
2990 public:
2991 ScopedVMInitArgs(const char *container_name) {
2992 _args.version = JNI_VERSION_1_2;
2993 _args.nOptions = 0;
2994 _args.options = nullptr;
2995 _args.ignoreUnrecognized = false;
2996 _container_name = (char *)container_name;
2997 _is_set = false;
2998 _vm_options_file_arg = nullptr;
2999 }
3000
3001 // Populates the JavaVMInitArgs object represented by this
3002 // ScopedVMInitArgs object with the arguments in options. The
3003 // allocated memory is deleted by the destructor. If this method
3004 // returns anything other than JNI_OK, then this object is in a
3005 // partially constructed state, and should be abandoned.
3006 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3007 _is_set = true;
3008 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3009 JavaVMOption, options->length(), mtArguments);
3010 if (options_arr == nullptr) {
3011 return JNI_ENOMEM;
3012 }
3013 _args.options = options_arr;
3014
3015 for (int i = 0; i < options->length(); i++) {
3016 options_arr[i] = options->at(i);
3017 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3018 if (options_arr[i].optionString == nullptr) {
3019 // Rely on the destructor to do cleanup.
3020 _args.nOptions = i;
3021 return JNI_ENOMEM;
3022 }
3023 }
3024
3025 _args.nOptions = options->length();
3026 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3027 return JNI_OK;
3028 }
3029
3030 JavaVMInitArgs* get() { return &_args; }
3031 char* container_name() { return _container_name; }
3032 bool is_set() { return _is_set; }
3033 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3034 char* vm_options_file_arg() { return _vm_options_file_arg; }
3035
3036 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3037 if (_vm_options_file_arg != nullptr) {
3038 os::free(_vm_options_file_arg);
3039 }
3040 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3041 }
3042
3043 ~ScopedVMInitArgs() {
3044 if (_vm_options_file_arg != nullptr) {
3045 os::free(_vm_options_file_arg);
3046 }
3047 if (_args.options == nullptr) return;
3048 for (int i = 0; i < _args.nOptions; i++) {
3049 os::free(_args.options[i].optionString);
3050 }
3051 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3052 }
3053
3054 // Insert options into this option list, to replace option at
3055 // vm_options_file_pos (-XX:VMOptionsFile)
3056 jint insert(const JavaVMInitArgs* args,
3057 const JavaVMInitArgs* args_to_insert,
3058 const int vm_options_file_pos) {
3059 assert(_args.options == nullptr, "shouldn't be set yet");
3060 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3061 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3062
3063 int length = args->nOptions + args_to_insert->nOptions - 1;
3064 // Construct new option array
3065 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3066 for (int i = 0; i < args->nOptions; i++) {
3067 if (i == vm_options_file_pos) {
3068 // insert the new options starting at the same place as the
3069 // -XX:VMOptionsFile option
3070 for (int j = 0; j < args_to_insert->nOptions; j++) {
3071 options.push(args_to_insert->options[j]);
3072 }
3073 } else {
3074 options.push(args->options[i]);
3075 }
3076 }
3077 // make into options array
3078 return set_args(&options);
3079 }
3080 };
3081
3082 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3083 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3084 }
3085
3086 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3087 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3088 }
3089
3090 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) {
3091 for (int index = args->nOptions - 1; index >= 0; index--) {
3092 JavaVMOption* option = args->options + index;
3093 if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) {
3094 return option;
3095 }
3096 }
3097
3098 return nullptr;
3099 }
3100
3101 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args,
3102 ScopedVMInitArgs* jdk_aot_vm_options_args) {
3103 // Don't bother scanning all the args if this env variable is not set
3104 if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) {
3105 return JNI_OK;
3106 }
3107
3108 // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value
3109 // of AOTMode.
3110 JavaVMOption* option = nullptr;
3111 for (int i = all_args->length() - 1; i >= 0; i--) {
3112 if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) {
3113 break;
3114 }
3115 }
3116
3117 if (option != nullptr) {
3118 // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet,
3119 // so its value is not reflected inside the global variable AOTMode.
3120 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) {
3121 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3122 }
3123 } else {
3124 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode,
3125 // which would have been set inside process_settings_file();
3126 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) {
3127 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3128 }
3129 }
3130
3131 return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args);
3132 }
3133
3134 jint Arguments::parse_options_environment_variable(const char* name,
3135 ScopedVMInitArgs* vm_args) {
3136 char *buffer = ::getenv(name);
3137
3138 // Don't check this environment variable if user has special privileges
3139 // (e.g. unix su command).
3140 if (buffer == nullptr || os::have_special_privileges()) {
3141 return JNI_OK;
3142 }
3143
3144 if ((buffer = os::strdup(buffer)) == nullptr) {
3145 return JNI_ENOMEM;
3146 }
3147
3148 jio_fprintf(defaultStream::error_stream(),
3149 "Picked up %s: %s\n", name, buffer);
3150
3151 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3152
3153 os::free(buffer);
3154 return retcode;
3155 }
3156
3157 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3158 // read file into buffer
3159 int fd = ::open(file_name, O_RDONLY);
3160 if (fd < 0) {
3161 jio_fprintf(defaultStream::error_stream(),
3162 "Could not open options file '%s'\n",
3163 file_name);
3164 return JNI_ERR;
3165 }
3166
3167 struct stat stbuf;
3168 int retcode = os::stat(file_name, &stbuf);
3169 if (retcode != 0) {
3170 jio_fprintf(defaultStream::error_stream(),
3171 "Could not stat options file '%s'\n",
3172 file_name);
3173 ::close(fd);
3174 return JNI_ERR;
3175 }
3176
3177 if (stbuf.st_size == 0) {
3178 // tell caller there is no option data and that is ok
3179 ::close(fd);
3180 return JNI_OK;
3181 }
3182
3183 // '+ 1' for null termination even with max bytes
3184 size_t bytes_alloc = stbuf.st_size + 1;
3185
3186 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3187 if (nullptr == buf) {
3188 jio_fprintf(defaultStream::error_stream(),
3189 "Could not allocate read buffer for options file parse\n");
3190 ::close(fd);
3191 return JNI_ENOMEM;
3192 }
3193
3194 memset(buf, 0, bytes_alloc);
3195
3196 // Fill buffer
3197 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3198 ::close(fd);
3199 if (bytes_read < 0) {
3200 FREE_C_HEAP_ARRAY(char, buf);
3201 jio_fprintf(defaultStream::error_stream(),
3202 "Could not read options file '%s'\n", file_name);
3203 return JNI_ERR;
3204 }
3205
3206 if (bytes_read == 0) {
3207 // tell caller there is no option data and that is ok
3208 FREE_C_HEAP_ARRAY(char, buf);
3209 return JNI_OK;
3210 }
3211
3212 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3213
3214 FREE_C_HEAP_ARRAY(char, buf);
3215 return retcode;
3216 }
3217
3218 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3219 // Construct option array
3220 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3221
3222 // some pointers to help with parsing
3223 char *buffer_end = buffer + buf_len;
3224 char *opt_hd = buffer;
3225 char *wrt = buffer;
3226 char *rd = buffer;
3227
3228 // parse all options
3229 while (rd < buffer_end) {
3230 // skip leading white space from the input string
3231 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3232 rd++;
3233 }
3234
3235 if (rd >= buffer_end) {
3236 break;
3237 }
3238
3239 // Remember this is where we found the head of the token.
3240 opt_hd = wrt;
3241
3242 // Tokens are strings of non white space characters separated
3243 // by one or more white spaces.
3244 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3245 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3246 int quote = *rd; // matching quote to look for
3247 rd++; // don't copy open quote
3248 while (rd < buffer_end && *rd != quote) {
3249 // include everything (even spaces)
3250 // up until the close quote
3251 *wrt++ = *rd++; // copy to option string
3252 }
3253
3254 if (rd < buffer_end) {
3255 rd++; // don't copy close quote
3256 } else {
3257 // did not see closing quote
3258 jio_fprintf(defaultStream::error_stream(),
3259 "Unmatched quote in %s\n", name);
3260 return JNI_ERR;
3261 }
3262 } else {
3263 *wrt++ = *rd++; // copy to option string
3264 }
3265 }
3266
3267 // steal a white space character and set it to null
3268 *wrt++ = '\0';
3269 // We now have a complete token
3270
3271 JavaVMOption option;
3272 option.optionString = opt_hd;
3273 option.extraInfo = nullptr;
3274
3275 options.append(option); // Fill in option
3276
3277 rd++; // Advance to next character
3278 }
3279
3280 // Fill out JavaVMInitArgs structure.
3281 return vm_args->set_args(&options);
3282 }
3283
3284 #ifndef PRODUCT
3285 // Determine whether LogVMOutput should be implicitly turned on.
3286 static bool use_vm_log() {
3287 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3288 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3289 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3290 PrintAssembly || TraceDeoptimization ||
3291 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3292 return true;
3293 }
3294
3295 #ifdef COMPILER1
3296 if (PrintC1Statistics) {
3297 return true;
3298 }
3299 #endif // COMPILER1
3300
3301 #ifdef COMPILER2
3302 if (PrintOptoAssembly || PrintOptoStatistics) {
3303 return true;
3304 }
3305 #endif // COMPILER2
3306
3307 return false;
3308 }
3309
3310 #endif // PRODUCT
3311
3312 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3313 for (int index = 0; index < args->nOptions; index++) {
3314 const JavaVMOption* option = args->options + index;
3315 const char* tail;
3316 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3317 return true;
3318 }
3319 }
3320 return false;
3321 }
3322
3323 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3324 const char* vm_options_file,
3325 const int vm_options_file_pos,
3326 ScopedVMInitArgs* vm_options_file_args,
3327 ScopedVMInitArgs* args_out) {
3328 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3329 if (code != JNI_OK) {
3330 return code;
3331 }
3332
3333 if (vm_options_file_args->get()->nOptions < 1) {
3334 return JNI_OK;
3335 }
3336
3337 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3338 jio_fprintf(defaultStream::error_stream(),
3339 "A VM options file may not refer to a VM options file. "
3340 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3341 "options file '%s' in options container '%s' is an error.\n",
3342 vm_options_file_args->vm_options_file_arg(),
3343 vm_options_file_args->container_name());
3344 return JNI_EINVAL;
3345 }
3346
3347 return args_out->insert(args, vm_options_file_args->get(),
3348 vm_options_file_pos);
3349 }
3350
3351 // Expand -XX:VMOptionsFile found in args_in as needed.
3352 // mod_args and args_out parameters may return values as needed.
3353 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3354 ScopedVMInitArgs* mod_args,
3355 JavaVMInitArgs** args_out) {
3356 jint code = match_special_option_and_act(args_in, mod_args);
3357 if (code != JNI_OK) {
3358 return code;
3359 }
3360
3361 if (mod_args->is_set()) {
3362 // args_in contains -XX:VMOptionsFile and mod_args contains the
3363 // original options from args_in along with the options expanded
3364 // from the VMOptionsFile. Return a short-hand to the caller.
3365 *args_out = mod_args->get();
3366 } else {
3367 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3368 }
3369 return JNI_OK;
3370 }
3371
3372 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3373 ScopedVMInitArgs* args_out) {
3374 // Remaining part of option string
3375 const char* tail;
3376 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3377
3378 for (int index = 0; index < args->nOptions; index++) {
3379 const JavaVMOption* option = args->options + index;
3380 if (match_option(option, "-XX:Flags=", &tail)) {
3381 Arguments::set_jvm_flags_file(tail);
3382 continue;
3383 }
3384 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3385 if (vm_options_file_args.found_vm_options_file_arg()) {
3386 jio_fprintf(defaultStream::error_stream(),
3387 "The option '%s' is already specified in the options "
3388 "container '%s' so the specification of '%s' in the "
3389 "same options container is an error.\n",
3390 vm_options_file_args.vm_options_file_arg(),
3391 vm_options_file_args.container_name(),
3392 option->optionString);
3393 return JNI_EINVAL;
3394 }
3395 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3396 // If there's a VMOptionsFile, parse that
3397 jint code = insert_vm_options_file(args, tail, index,
3398 &vm_options_file_args, args_out);
3399 if (code != JNI_OK) {
3400 return code;
3401 }
3402 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3403 if (args_out->is_set()) {
3404 // The VMOptions file inserted some options so switch 'args'
3405 // to the new set of options, and continue processing which
3406 // preserves "last option wins" semantics.
3407 args = args_out->get();
3408 // The first option from the VMOptionsFile replaces the
3409 // current option. So we back track to process the
3410 // replacement option.
3411 index--;
3412 }
3413 continue;
3414 }
3415 if (match_option(option, "-XX:+PrintVMOptions")) {
3416 PrintVMOptions = true;
3417 continue;
3418 }
3419 if (match_option(option, "-XX:-PrintVMOptions")) {
3420 PrintVMOptions = false;
3421 continue;
3422 }
3423 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3424 IgnoreUnrecognizedVMOptions = true;
3425 continue;
3426 }
3427 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3428 IgnoreUnrecognizedVMOptions = false;
3429 continue;
3430 }
3431 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3432 JVMFlag::printFlags(tty, false);
3433 vm_exit(0);
3434 }
3435
3436 #ifndef PRODUCT
3437 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3438 JVMFlag::printFlags(tty, true);
3439 vm_exit(0);
3440 }
3441 #endif
3442 }
3443 return JNI_OK;
3444 }
3445
3446 static void print_options(const JavaVMInitArgs *args) {
3447 const char* tail;
3448 for (int index = 0; index < args->nOptions; index++) {
3449 const JavaVMOption *option = args->options + index;
3450 if (match_option(option, "-XX:", &tail)) {
3451 logOption(tail);
3452 }
3453 }
3454 }
3455
3456 bool Arguments::handle_deprecated_print_gc_flags() {
3457 if (PrintGC) {
3458 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3459 }
3460 if (PrintGCDetails) {
3461 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3462 }
3463
3464 if (_legacyGCLogging.lastFlag == 2) {
3465 // -Xloggc was used to specify a filename
3466 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3467
3468 LogTarget(Error, logging) target;
3469 LogStream errstream(target);
3470 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3471 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3472 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3473 }
3474 return true;
3475 }
3476
3477 static void apply_debugger_ergo() {
3478 #ifdef ASSERT
3479 if (ReplayCompiles) {
3480 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3481 }
3482
3483 if (UseDebuggerErgo) {
3484 // Turn on sub-flags
3485 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3486 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3487 }
3488
3489 if (UseDebuggerErgo2) {
3490 // Debugging with limited number of CPUs
3491 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3492 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3493 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3494 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3495 }
3496 #endif // ASSERT
3497 }
3498
3499 // Parse entry point called from JNI_CreateJavaVM
3500
3501 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3502 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3503 JVMFlag::check_all_flag_declarations();
3504
3505 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3506 const char* hotspotrc = ".hotspotrc";
3507 bool settings_file_specified = false;
3508 bool needs_hotspotrc_warning = false;
3509 ScopedVMInitArgs initial_vm_options_args("");
3510 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3511 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3512 ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'");
3513
3514 // Pointers to current working set of containers
3515 JavaVMInitArgs* cur_cmd_args;
3516 JavaVMInitArgs* cur_vm_options_args;
3517 JavaVMInitArgs* cur_java_options_args;
3518 JavaVMInitArgs* cur_java_tool_options_args;
3519 JavaVMInitArgs* cur_jdk_aot_vm_options_args;
3520
3521 // Containers for modified/expanded options
3522 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3523 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3524 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3525 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3526 ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'");
3527
3528 GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args;
3529
3530 jint code =
3531 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3532 if (code != JNI_OK) {
3533 return code;
3534 }
3535
3536 // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM.
3537 // This is an undocumented feature.
3538 code = parse_java_options_environment_variable(&initial_java_options_args);
3539 if (code != JNI_OK) {
3540 return code;
3541 }
3542
3543 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3544 char *vmoptions = ClassLoader::lookup_vm_options();
3545 if (vmoptions != nullptr) {
3546 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3547 FREE_C_HEAP_ARRAY(char, vmoptions);
3548 if (code != JNI_OK) {
3549 return code;
3550 }
3551 }
3552
3553 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3554 &mod_java_tool_options_args,
3555 &cur_java_tool_options_args);
3556 if (code != JNI_OK) {
3557 return code;
3558 }
3559
3560 code = expand_vm_options_as_needed(initial_cmd_args,
3561 &mod_cmd_args,
3562 &cur_cmd_args);
3563 if (code != JNI_OK) {
3564 return code;
3565 }
3566
3567 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3568 &mod_java_options_args,
3569 &cur_java_options_args);
3570 if (code != JNI_OK) {
3571 return code;
3572 }
3573
3574 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3575 &mod_vm_options_args,
3576 &cur_vm_options_args);
3577 if (code != JNI_OK) {
3578 return code;
3579 }
3580
3581 const char* flags_file = Arguments::get_jvm_flags_file();
3582 settings_file_specified = (flags_file != nullptr);
3583
3584 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags.
3585 if (settings_file_specified) {
3586 if (!process_settings_file(flags_file, true,
3587 IgnoreUnrecognizedVMOptions)) {
3588 return JNI_EINVAL;
3589 }
3590 } else {
3591 #ifdef ASSERT
3592 // Parse default .hotspotrc settings file
3593 if (!process_settings_file(".hotspotrc", false,
3594 IgnoreUnrecognizedVMOptions)) {
3595 return JNI_EINVAL;
3596 }
3597 #else
3598 struct stat buf;
3599 if (os::stat(hotspotrc, &buf) == 0) {
3600 needs_hotspotrc_warning = true;
3601 }
3602 #endif
3603 }
3604
3605 // The settings in the args are applied in this order to the the JVM global flags.
3606 // For historical reasons, the order is DIFFERENT than the scanning order of
3607 // the above expand_vm_options_as_needed() calls.
3608 all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE});
3609 all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR});
3610 all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE});
3611 all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR});
3612
3613 // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all
3614 // the options that have been gathered above.
3615 code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args);
3616 if (code != JNI_OK) {
3617 return code;
3618 }
3619 code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(),
3620 &mod_jdk_aot_vm_options_args,
3621 &cur_jdk_aot_vm_options_args);
3622 if (code != JNI_OK) {
3623 return code;
3624 }
3625
3626 for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) {
3627 JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index;
3628 const char* optionString = option->optionString;
3629 if (strstr(optionString, "-XX:AOTMode=") == optionString &&
3630 strcmp(optionString, "-XX:AOTMode=create") != 0) {
3631 jio_fprintf(defaultStream::error_stream(),
3632 "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString);
3633 return JNI_ERR;
3634 }
3635 }
3636
3637 all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR});
3638
3639 if (IgnoreUnrecognizedVMOptions) {
3640 // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of
3641 // the JDK so it shouldn't have bad options.
3642 cur_cmd_args->ignoreUnrecognized = true;
3643 cur_java_tool_options_args->ignoreUnrecognized = true;
3644 cur_java_options_args->ignoreUnrecognized = true;
3645 cur_jdk_aot_vm_options_args->ignoreUnrecognized = true;
3646 }
3647
3648 if (PrintVMOptions) {
3649 // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed.
3650 print_options(cur_java_tool_options_args);
3651 print_options(cur_cmd_args);
3652 print_options(cur_java_options_args);
3653 print_options(cur_jdk_aot_vm_options_args);
3654 }
3655
3656 // Apply the settings in these args to the JVM global flags.
3657 jint result = parse_vm_init_args(&all_args);
3658
3659 if (result != JNI_OK) {
3660 return result;
3661 }
3662
3663 // Delay warning until here so that we've had a chance to process
3664 // the -XX:-PrintWarnings flag
3665 if (needs_hotspotrc_warning) {
3666 warning("%s file is present but has been ignored. "
3667 "Run with -XX:Flags=%s to load the file.",
3668 hotspotrc, hotspotrc);
3669 }
3670
3671 if (needs_module_property_warning) {
3672 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3673 " names that are reserved for internal use.");
3674 }
3675
3676 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3677 UNSUPPORTED_OPTION(UseLargePages);
3678 #endif
3679
3680 #if defined(AIX)
3681 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3682 #endif
3683
3684 #ifndef PRODUCT
3685 if (TraceBytecodesAt != 0) {
3686 TraceBytecodes = true;
3687 }
3688 #endif // PRODUCT
3689
3690 if (ScavengeRootsInCode == 0) {
3691 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3692 warning("Forcing ScavengeRootsInCode non-zero");
3693 }
3694 ScavengeRootsInCode = 1;
3695 }
3696
3697 if (!handle_deprecated_print_gc_flags()) {
3698 return JNI_EINVAL;
3699 }
3700
3701 // Set object alignment values.
3702 set_object_alignment();
3703
3704 #if !INCLUDE_CDS
3705 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3706 jio_fprintf(defaultStream::error_stream(),
3707 "Shared spaces are not supported in this VM\n");
3708 return JNI_ERR;
3709 }
3710 if (DumpLoadedClassList != nullptr) {
3711 jio_fprintf(defaultStream::error_stream(),
3712 "DumpLoadedClassList is not supported in this VM\n");
3713 return JNI_ERR;
3714 }
3715 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3716 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) {
3717 warning("Shared spaces are not supported in this VM");
3718 UseSharedSpaces = false;
3719 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3720 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot));
3721 }
3722 no_shared_spaces("CDS Disabled");
3723 #endif // INCLUDE_CDS
3724
3725 // Verify NMT arguments
3726 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3727 if (lvl == NMT_unknown) {
3728 jio_fprintf(defaultStream::error_stream(),
3729 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3730 return JNI_ERR;
3731 }
3732 if (PrintNMTStatistics && lvl == NMT_off) {
3733 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3734 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3735 }
3736
3737 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3738 if (trace_dependencies && VerifyDependencies) {
3739 warning("dependency logging results may be inflated by VerifyDependencies");
3740 }
3741
3742 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3743 log_is_enabled(Info, class, load, cause);
3744 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3745 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3746 }
3747
3748 apply_debugger_ergo();
3749
3750 // The VMThread needs to stop now and then to execute these debug options.
3751 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3752 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3753 }
3754
3755 if (log_is_enabled(Info, arguments)) {
3756 LogStream st(Log(arguments)::info());
3757 Arguments::print_on(&st);
3758 }
3759
3760 return JNI_OK;
3761 }
3762
3763 void Arguments::set_compact_headers_flags() {
3764 #ifdef _LP64
3765 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3766 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3767 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3768 }
3769 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3770 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3771 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3772 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3773
3774 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3775 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3776 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3777 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3778 } else {
3779 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3780 }
3781 }
3782 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3783 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3784 }
3785 #endif
3786 }
3787
3788 jint Arguments::apply_ergo() {
3789 // Set flags based on ergonomics.
3790 jint result = set_ergonomics_flags();
3791 if (result != JNI_OK) return result;
3792
3793 // Set heap size based on available physical memory
3794 set_heap_size();
3795
3796 GCConfig::arguments()->initialize();
3797
3798 set_compact_headers_flags();
3799
3800 if (UseCompressedClassPointers) {
3801 CompressedKlassPointers::pre_initialize();
3802 }
3803
3804 CDSConfig::ergo_initialize();
3805
3806 // Initialize Metaspace flags and alignments
3807 Metaspace::ergo_initialize();
3808
3809 if (!StringDedup::ergo_initialize()) {
3810 return JNI_EINVAL;
3811 }
3812
3813 // Set compiler flags after GC is selected and GC specific
3814 // flags (LoopStripMiningIter) are set.
3815 CompilerConfig::ergo_initialize();
3816
3817 // Set bytecode rewriting flags
3818 set_bytecode_flags();
3819
3820 // Set flags if aggressive optimization flags are enabled
3821 jint code = set_aggressive_opts_flags();
3822 if (code != JNI_OK) {
3823 return code;
3824 }
3825
3826 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3827 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3828 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3829 warning("UseSecondarySupersTable is not supported");
3830 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3831 }
3832 if (!UseSecondarySupersTable) {
3833 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3834 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3835 }
3836
3837 #ifdef ZERO
3838 // Clear flags not supported on zero.
3839 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3840 #endif // ZERO
3841
3842 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3843 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3844 DebugNonSafepoints = true;
3845 }
3846
3847 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3848 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3849 }
3850
3851 // Treat the odd case where local verification is enabled but remote
3852 // verification is not as if both were enabled.
3853 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3854 log_info(verification)("Turning on remote verification because local verification is on");
3855 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3856 }
3857
3858 #ifndef PRODUCT
3859 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3860 if (use_vm_log()) {
3861 LogVMOutput = true;
3862 }
3863 }
3864 #endif // PRODUCT
3865
3866 if (PrintCommandLineFlags) {
3867 JVMFlag::printSetFlags(tty);
3868 }
3869
3870 #if COMPILER2_OR_JVMCI
3871 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3872 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3873 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3874 }
3875 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3876
3877 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3878 if (!EnableVectorReboxing) {
3879 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3880 } else {
3881 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3882 }
3883 }
3884 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3885 }
3886 #endif // COMPILER2_OR_JVMCI
3887
3888 #ifdef COMPILER2
3889 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
3890 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
3891 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
3892 }
3893 #endif // COMPILER2
3894
3895 if (log_is_enabled(Info, init)) {
3896 if (FLAG_IS_DEFAULT(ProfileVMLocks)) {
3897 FLAG_SET_DEFAULT(ProfileVMLocks, true);
3898 }
3899 if (UsePerfData && !log_is_enabled(Info, perf, class, link)) {
3900 // automatically enable -Xlog:perf+class+link
3901 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(perf, class, link));
3902 }
3903 // Don't turn on ProfileVMCalls and ProfileRuntimeCalls by default.
3904 } else {
3905 if (!FLAG_IS_DEFAULT(ProfileVMLocks) && ProfileVMLocks) {
3906 warning("Disabling ProfileVMLocks since logging is turned off.");
3907 FLAG_SET_DEFAULT(ProfileVMLocks, false);
3908 }
3909 if (!FLAG_IS_DEFAULT(ProfileVMCalls) && ProfileVMCalls) {
3910 warning("Disabling ProfileVMCalls since logging is turned off.");
3911 FLAG_SET_DEFAULT(ProfileVMCalls, false);
3912 }
3913 if (!FLAG_IS_DEFAULT(ProfileRuntimeCalls) && ProfileRuntimeCalls) {
3914 warning("Disabling ProfileRuntimeCalls since logging is turned off.");
3915 FLAG_SET_DEFAULT(ProfileRuntimeCalls, false);
3916 }
3917 if (log_is_enabled(Info, perf, class, link)) {
3918 warning("Disabling -Xlog:perf+class+link since logging is turned off.");
3919 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
3920 assert(!log_is_enabled(Info, perf, class, link), "sanity");
3921 }
3922 }
3923 if (FLAG_IS_DEFAULT(PerfDataMemorySize)) {
3924 if (ProfileVMLocks || ProfileVMCalls || ProfileRuntimeCalls) {
3925 FLAG_SET_DEFAULT(PerfDataMemorySize, 128*K); // reserve more space for extra perf counters
3926 }
3927 }
3928
3929 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3930 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3931 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3932 }
3933 }
3934 return JNI_OK;
3935 }
3936
3937 jint Arguments::adjust_after_os() {
3938 if (UseNUMA) {
3939 if (UseParallelGC) {
3940 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3941 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3942 }
3943 }
3944 }
3945 return JNI_OK;
3946 }
3947
3948 int Arguments::PropertyList_count(SystemProperty* pl) {
3949 int count = 0;
3950 while(pl != nullptr) {
3951 count++;
3952 pl = pl->next();
3953 }
3954 return count;
3955 }
3956
3957 // Return the number of readable properties.
3958 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3959 int count = 0;
3960 while(pl != nullptr) {
3961 if (pl->readable()) {
3962 count++;
3963 }
3964 pl = pl->next();
3965 }
3966 return count;
3967 }
3968
3969 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3970 assert(key != nullptr, "just checking");
3971 SystemProperty* prop;
3972 for (prop = pl; prop != nullptr; prop = prop->next()) {
3973 if (strcmp(key, prop->key()) == 0) return prop->value();
3974 }
3975 return nullptr;
3976 }
3977
3978 // Return the value of the requested property provided that it is a readable property.
3979 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3980 assert(key != nullptr, "just checking");
3981 SystemProperty* prop;
3982 // Return the property value if the keys match and the property is not internal or
3983 // it's the special internal property "jdk.boot.class.path.append".
3984 for (prop = pl; prop != nullptr; prop = prop->next()) {
3985 if (strcmp(key, prop->key()) == 0) {
3986 if (!prop->internal()) {
3987 return prop->value();
3988 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3989 return prop->value();
3990 } else {
3991 // Property is internal and not jdk.boot.class.path.append so return null.
3992 return nullptr;
3993 }
3994 }
3995 }
3996 return nullptr;
3997 }
3998
3999 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4000 SystemProperty* p = *plist;
4001 if (p == nullptr) {
4002 *plist = new_p;
4003 } else {
4004 while (p->next() != nullptr) {
4005 p = p->next();
4006 }
4007 p->set_next(new_p);
4008 }
4009 }
4010
4011 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4012 bool writeable, bool internal) {
4013 if (plist == nullptr)
4014 return;
4015
4016 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4017 PropertyList_add(plist, new_p);
4018 }
4019
4020 void Arguments::PropertyList_add(SystemProperty *element) {
4021 PropertyList_add(&_system_properties, element);
4022 }
4023
4024 // This add maintains unique property key in the list.
4025 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4026 PropertyAppendable append, PropertyWriteable writeable,
4027 PropertyInternal internal) {
4028 if (plist == nullptr)
4029 return;
4030
4031 // If property key exists and is writeable, then update with new value.
4032 // Trying to update a non-writeable property is silently ignored.
4033 SystemProperty* prop;
4034 for (prop = *plist; prop != nullptr; prop = prop->next()) {
4035 if (strcmp(k, prop->key()) == 0) {
4036 if (append == AppendProperty) {
4037 prop->append_writeable_value(v);
4038 } else {
4039 prop->set_writeable_value(v);
4040 }
4041 return;
4042 }
4043 }
4044
4045 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4046 }
4047
4048 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4049 // Returns true if all of the source pointed by src has been copied over to
4050 // the destination buffer pointed by buf. Otherwise, returns false.
4051 // Notes:
4052 // 1. If the length (buflen) of the destination buffer excluding the
4053 // null terminator character is not long enough for holding the expanded
4054 // pid characters, it also returns false instead of returning the partially
4055 // expanded one.
4056 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4057 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4058 char* buf, size_t buflen) {
4059 const char* p = src;
4060 char* b = buf;
4061 const char* src_end = &src[srclen];
4062 char* buf_end = &buf[buflen - 1];
4063
4064 while (p < src_end && b < buf_end) {
4065 if (*p == '%') {
4066 switch (*(++p)) {
4067 case '%': // "%%" ==> "%"
4068 *b++ = *p++;
4069 break;
4070 case 'p': { // "%p" ==> current process id
4071 // buf_end points to the character before the last character so
4072 // that we could write '\0' to the end of the buffer.
4073 size_t buf_sz = buf_end - b + 1;
4074 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4075
4076 // if jio_snprintf fails or the buffer is not long enough to hold
4077 // the expanded pid, returns false.
4078 if (ret < 0 || ret >= (int)buf_sz) {
4079 return false;
4080 } else {
4081 b += ret;
4082 assert(*b == '\0', "fail in copy_expand_pid");
4083 if (p == src_end && b == buf_end + 1) {
4084 // reach the end of the buffer.
4085 return true;
4086 }
4087 }
4088 p++;
4089 break;
4090 }
4091 default :
4092 *b++ = '%';
4093 }
4094 } else {
4095 *b++ = *p++;
4096 }
4097 }
4098 *b = '\0';
4099 return (p == src_end); // return false if not all of the source was copied
4100 }