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