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