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 #include <string.h>
79
80 static const char _default_java_launcher[] = "generic";
81
82 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
83
84 char* Arguments::_jvm_flags_file = nullptr;
85 char** Arguments::_jvm_flags_array = nullptr;
86 int Arguments::_num_jvm_flags = 0;
87 char** Arguments::_jvm_args_array = nullptr;
88 int Arguments::_num_jvm_args = 0;
89 unsigned int Arguments::_addmods_count = 0;
90 #if INCLUDE_JVMCI
91 bool Arguments::_jvmci_module_added = false;
92 #endif
93 char* Arguments::_java_command = nullptr;
94 SystemProperty* Arguments::_system_properties = nullptr;
95 size_t Arguments::_conservative_max_heap_alignment = 0;
96 Arguments::Mode Arguments::_mode = _mixed;
97 const char* Arguments::_java_vendor_url_bug = nullptr;
98 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
99 bool Arguments::_executing_unit_tests = false;
100
101 // These parameters are reset in method parse_vm_init_args()
102 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
103 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
104 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
105 bool Arguments::_ClipInlining = ClipInlining;
106 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
107
108 bool Arguments::_enable_preview = false;
109 bool Arguments::_has_jdwp_agent = false;
110
111 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
112
113 // These are not set by the JDK's built-in launchers, but they can be set by
114 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
115 // JavaVMOption in jni.h.
116 abort_hook_t Arguments::_abort_hook = nullptr;
117 exit_hook_t Arguments::_exit_hook = nullptr;
118 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
119
120
121 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
122 SystemProperty *Arguments::_java_library_path = nullptr;
123 SystemProperty *Arguments::_java_home = nullptr;
124 SystemProperty *Arguments::_java_class_path = nullptr;
125 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
126 SystemProperty *Arguments::_vm_info = nullptr;
127
128 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
129 PathString *Arguments::_boot_class_path = nullptr;
130 bool Arguments::_has_jimage = false;
131
132 char* Arguments::_ext_dirs = nullptr;
133
134 // True if -Xshare:auto option was specified.
135 static bool xshare_auto_cmd_line = false;
136
137 // True if -Xint/-Xmixed/-Xcomp were specified
138 static bool mode_flag_cmd_line = false;
139
140 struct VMInitArgsGroup {
141 const JavaVMInitArgs* _args;
142 JVMFlagOrigin _origin;
143 };
144
145 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
146 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
147 if (new_value == nullptr) {
148 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
149 return false;
150 }
151 if (_value != nullptr) {
152 FreeHeap(_value);
153 }
154 _value = new_value;
155 strcpy(_value, value);
156 return true;
157 }
158
159 void PathString::append_value(const char *value) {
160 char *sp;
161 size_t len = 0;
162 if (value != nullptr) {
163 len = strlen(value);
164 if (_value != nullptr) {
165 len += strlen(_value);
166 }
167 sp = AllocateHeap(len+2, mtArguments);
168 assert(sp != nullptr, "Unable to allocate space for new append path value");
169 if (sp != nullptr) {
170 if (_value != nullptr) {
171 strcpy(sp, _value);
172 strcat(sp, os::path_separator());
173 strcat(sp, value);
174 FreeHeap(_value);
175 } else {
176 strcpy(sp, value);
177 }
178 _value = sp;
179 }
180 }
181 }
182
183 PathString::PathString(const char* value) {
184 if (value == nullptr) {
185 _value = nullptr;
186 } else {
187 _value = AllocateHeap(strlen(value)+1, mtArguments);
188 strcpy(_value, value);
189 }
190 }
191
192 PathString::~PathString() {
193 if (_value != nullptr) {
194 FreeHeap(_value);
195 _value = nullptr;
196 }
197 }
198
199 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
200 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
201 size_t len = strlen(module_name) + 1;
202 _module_name = AllocateHeap(len, mtInternal);
203 strncpy(_module_name, module_name, len); // copy the trailing null
204 _path = new PathString(path);
205 }
206
207 ModulePatchPath::~ModulePatchPath() {
208 if (_module_name != nullptr) {
209 FreeHeap(_module_name);
210 _module_name = nullptr;
211 }
212 if (_path != nullptr) {
213 delete _path;
214 _path = nullptr;
215 }
216 }
217
218 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
219 if (key == nullptr) {
220 _key = nullptr;
221 } else {
222 _key = AllocateHeap(strlen(key)+1, mtArguments);
223 strcpy(_key, key);
224 }
225 _next = nullptr;
226 _internal = internal;
227 _writeable = writeable;
228 }
229
230 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
231 // part of the option string.
232 static bool match_option(const JavaVMOption *option, const char* name,
233 const char** tail) {
234 size_t len = strlen(name);
235 if (strncmp(option->optionString, name, len) == 0) {
236 *tail = option->optionString + len;
237 return true;
238 } else {
239 return false;
240 }
241 }
242
243 // Check if 'option' matches 'name'. No "tail" is allowed.
244 static bool match_option(const JavaVMOption *option, const char* name) {
245 const char* tail = nullptr;
246 bool result = match_option(option, name, &tail);
247 if (tail != nullptr && *tail == '\0') {
248 return result;
249 } else {
250 return false;
251 }
252 }
253
254 // Return true if any of the strings in null-terminated array 'names' matches.
255 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
256 // the option must match exactly.
257 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
258 bool tail_allowed) {
259 for (/* empty */; *names != nullptr; ++names) {
260 if (match_option(option, *names, tail)) {
261 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
262 return true;
263 }
264 }
265 }
266 return false;
267 }
268
269 #if INCLUDE_JFR
270 static bool _has_jfr_option = false; // is using JFR
271
272 // return true on failure
273 static bool match_jfr_option(const JavaVMOption** option) {
274 assert((*option)->optionString != nullptr, "invariant");
275 char* tail = nullptr;
276 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
277 _has_jfr_option = true;
278 return Jfr::on_start_flight_recording_option(option, tail);
279 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
280 _has_jfr_option = true;
281 return Jfr::on_flight_recorder_option(option, tail);
282 }
283 return false;
284 }
285
286 bool Arguments::has_jfr_option() {
287 return _has_jfr_option;
288 }
289 #endif
290
291 static void logOption(const char* opt) {
292 if (PrintVMOptions) {
293 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
294 }
295 }
296
297 bool needs_module_property_warning = false;
298
299 #define MODULE_PROPERTY_PREFIX "jdk.module."
300 #define MODULE_PROPERTY_PREFIX_LEN 11
301 #define ADDEXPORTS "addexports"
302 #define ADDEXPORTS_LEN 10
303 #define ADDREADS "addreads"
304 #define ADDREADS_LEN 8
305 #define ADDOPENS "addopens"
306 #define ADDOPENS_LEN 8
307 #define PATCH "patch"
308 #define PATCH_LEN 5
309 #define ADDMODS "addmods"
310 #define ADDMODS_LEN 7
311 #define LIMITMODS "limitmods"
312 #define LIMITMODS_LEN 9
313 #define PATH "path"
314 #define PATH_LEN 4
315 #define UPGRADE_PATH "upgrade.path"
316 #define UPGRADE_PATH_LEN 12
317 #define ENABLE_NATIVE_ACCESS "enable.native.access"
318 #define ENABLE_NATIVE_ACCESS_LEN 20
319 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
320 #define ILLEGAL_NATIVE_ACCESS_LEN 21
321
322 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
323 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
324 return ((strncmp(option, property, len) == 0) &&
325 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
326 }
327
328 // Return true if property starts with "jdk.module." and its ensuing chars match
329 // any of the reserved module properties.
330 // property should be passed without the leading "-D".
331 bool Arguments::is_internal_module_property(const char* property) {
332 return internal_module_property_helper(property, false);
333 }
334
335 // Returns true if property is one of those recognized by is_internal_module_property() but
336 // is not supported by CDS archived full module graph.
337 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
338 return internal_module_property_helper(property, true);
339 }
340
341 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
342 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
343 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
344 if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
345 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
346 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
347 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN)) {
348 return true;
349 }
350
351 if (!check_for_cds) {
352 // CDS notes: these properties are supported by CDS archived full module graph.
353 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
354 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
355 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
356 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
357 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
358 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
359 return true;
360 }
361 }
362 }
363 return false;
364 }
365
366 bool Arguments::patching_migrated_classes(const char* property, const char* value) {
367 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
368 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
369 if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN)) {
370 if (strcmp(value, "java.base-valueclasses.jar")) {
371 return true;
372 }
373 }
374 }
375 return false;
376 }
377
378 // Process java launcher properties.
379 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
380 // See if sun.java.launcher is defined.
381 // Must do this before setting up other system properties,
382 // as some of them may depend on launcher type.
383 for (int index = 0; index < args->nOptions; index++) {
384 const JavaVMOption* option = args->options + index;
385 const char* tail;
386
387 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
388 process_java_launcher_argument(tail, option->extraInfo);
389 continue;
390 }
391 if (match_option(option, "-XX:+ExecutingUnitTests")) {
392 _executing_unit_tests = true;
393 continue;
394 }
395 }
396 }
397
398 // Initialize system properties key and value.
399 void Arguments::init_system_properties() {
400
401 // Set up _boot_class_path which is not a property but
402 // relies heavily on argument processing and the jdk.boot.class.path.append
403 // property. It is used to store the underlying boot class path.
404 _boot_class_path = new PathString(nullptr);
405
406 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
407 "Java Virtual Machine Specification", false));
408 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
409 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
410 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
411
412 // Initialize the vm.info now, but it will need updating after argument parsing.
413 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
414
415 // Following are JVMTI agent writable properties.
416 // Properties values are set to nullptr and they are
417 // os specific they are initialized in os::init_system_properties_values().
418 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
419 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
420 _java_home = new SystemProperty("java.home", nullptr, true);
421 _java_class_path = new SystemProperty("java.class.path", "", true);
422 // jdk.boot.class.path.append is a non-writeable, internal property.
423 // It can only be set by either:
424 // - -Xbootclasspath/a:
425 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
426 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
427
428 // Add to System Property list.
429 PropertyList_add(&_system_properties, _sun_boot_library_path);
430 PropertyList_add(&_system_properties, _java_library_path);
431 PropertyList_add(&_system_properties, _java_home);
432 PropertyList_add(&_system_properties, _java_class_path);
433 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
434 PropertyList_add(&_system_properties, _vm_info);
435
436 // Set OS specific system properties values
437 os::init_system_properties_values();
438 }
439
440 // Update/Initialize System properties after JDK version number is known
441 void Arguments::init_version_specific_system_properties() {
442 enum { bufsz = 16 };
443 char buffer[bufsz];
444 const char* spec_vendor = "Oracle Corporation";
445 uint32_t spec_version = JDK_Version::current().major_version();
446
447 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
448
449 PropertyList_add(&_system_properties,
450 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
451 PropertyList_add(&_system_properties,
452 new SystemProperty("java.vm.specification.version", buffer, false));
453 PropertyList_add(&_system_properties,
454 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
455 }
456
457 /*
458 * -XX argument processing:
459 *
460 * -XX arguments are defined in several places, such as:
461 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
462 * -XX arguments are parsed in parse_argument().
463 * -XX argument bounds checking is done in check_vm_args_consistency().
464 *
465 * Over time -XX arguments may change. There are mechanisms to handle common cases:
466 *
467 * ALIASED: An option that is simply another name for another option. This is often
468 * part of the process of deprecating a flag, but not all aliases need
469 * to be deprecated.
470 *
471 * Create an alias for an option by adding the old and new option names to the
472 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
473 *
474 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
475 * support may be removed in the future. Both regular and aliased options may be
476 * deprecated.
477 *
478 * Add a deprecation warning for an option (or alias) by adding an entry in the
479 * "special_jvm_flags" table and setting the "deprecated_in" field.
480 * Often an option "deprecated" in one major release will
481 * be made "obsolete" in the next. In this case the entry should also have its
482 * "obsolete_in" field set.
483 *
484 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
485 * on the command line. A warning is printed to let the user know that option might not
486 * be accepted in the future.
487 *
488 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
489 * table and setting the "obsolete_in" field.
490 *
491 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
492 * to the current JDK version. The system will flatly refuse to admit the existence of
493 * the flag. This allows a flag to die automatically over JDK releases.
494 *
495 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
496 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
497 * - Newly obsolete or expired deprecated options should have their global variable
498 * definitions removed (from globals.hpp, etc) and related implementations removed.
499 *
500 * Recommended approach for removing options:
501 *
502 * To remove options commonly used by customers (e.g. product -XX options), use
503 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
504 *
505 * To remove internal options (e.g. diagnostic, experimental, develop options), use
506 * a 2-step model adding major release numbers to the obsolete and expire columns.
507 *
508 * To change the name of an option, use the alias table as well as a 2-step
509 * model adding major release numbers to the deprecate and expire columns.
510 * Think twice about aliasing commonly used customer options.
511 *
512 * There are times when it is appropriate to leave a future release number as undefined.
513 *
514 * Tests: Aliases should be tested in VMAliasOptions.java.
515 * Deprecated options should be tested in VMDeprecatedOptions.java.
516 */
517
518 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
519 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
520 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
521 // the command-line as usual, but will issue a warning.
522 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
523 // the command-line, while issuing a warning and ignoring the flag value.
524 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
525 // existence of the flag.
526 //
527 // MANUAL CLEANUP ON JDK VERSION UPDATES:
528 // This table ensures that the handling of options will update automatically when the JDK
529 // version is incremented, but the source code needs to be cleanup up manually:
530 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
531 // variable should be removed, as well as users of the variable.
532 // - As "deprecated" options age into "obsolete" options, move the entry into the
533 // "Obsolete Flags" section of the table.
534 // - All expired options should be removed from the table.
535 static SpecialFlag const special_jvm_flags[] = {
536 // -------------- Deprecated Flags --------------
537 // --- Non-alias flags - sorted by obsolete_in then expired_in:
538 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
539 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
540 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
541 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
542 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
543 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
544 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
545 #ifdef _LP64
546 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::undefined() },
547 #endif
548 { "ParallelRefProcEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
549 { "ParallelRefProcBalancingEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
550 { "PSChunkLargeArrays", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
551 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
552 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
553
554 // -------------- Obsolete Flags - sorted by expired_in --------------
555
556 #ifdef LINUX
557 { "UseOprofile", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) },
558 #endif
559 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
560 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::undefined() },
561 { "ZMarkStackSpaceLimit", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
562 #if defined(AARCH64)
563 { "NearCpool", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
564 #endif
565
566 { "AdaptiveSizeMajorGCDecayTimeScale", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
567 { "AdaptiveSizePolicyInitializingSteps", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
568 { "AdaptiveSizePolicyOutputInterval", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
569 { "AdaptiveSizeThroughPutPolicy", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
570 { "AdaptiveTimeWeight", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
571 { "PausePadding", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
572 { "SurvivorPadding", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
573 { "TenuredGenerationSizeIncrement", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
574 { "TenuredGenerationSizeSupplement", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
575 { "TenuredGenerationSizeSupplementDecay", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
576 { "UseAdaptiveGenerationSizePolicyAtMajorCollection", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
577 { "UseAdaptiveGenerationSizePolicyAtMinorCollection", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
578 { "UseAdaptiveSizeDecayMajorGCCost", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
579 { "UseAdaptiveSizePolicyFootprintGoal", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
580 { "UseAdaptiveSizePolicyWithSystemGC", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
581 { "UsePSAdaptiveSurvivorSizePolicy", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) },
582
583 #ifdef ASSERT
584 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
585 #endif
586
587 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
588 // These entries will generate build errors. Their purpose is to test the macros.
589 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
590 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
591 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
592 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
593 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
594 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
595 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
596 #endif
597
598 { nullptr, JDK_Version(0), JDK_Version(0) }
599 };
600
601 // Flags that are aliases for other flags.
602 typedef struct {
603 const char* alias_name;
604 const char* real_name;
605 } AliasedFlag;
606
607 static AliasedFlag const aliased_jvm_flags[] = {
608 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
609 { nullptr, nullptr}
610 };
611
612 // Return true if "v" is less than "other", where "other" may be "undefined".
613 static bool version_less_than(JDK_Version v, JDK_Version other) {
614 assert(!v.is_undefined(), "must be defined");
615 if (!other.is_undefined() && v.compare(other) >= 0) {
616 return false;
617 } else {
618 return true;
619 }
620 }
621
622 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
623 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
624 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
625 flag = special_jvm_flags[i];
626 return true;
627 }
628 }
629 return false;
630 }
631
632 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
633 assert(version != nullptr, "Must provide a version buffer");
634 SpecialFlag flag;
635 if (lookup_special_flag(flag_name, flag)) {
636 if (!flag.obsolete_in.is_undefined()) {
637 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
638 *version = flag.obsolete_in;
639 // This flag may have been marked for obsoletion in this version, but we may not
640 // have actually removed it yet. Rather than ignoring it as soon as we reach
641 // this version we allow some time for the removal to happen. So if the flag
642 // still actually exists we process it as normal, but issue an adjusted warning.
643 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
644 if (real_flag != nullptr) {
645 char version_str[256];
646 version->to_string(version_str, sizeof(version_str));
647 warning("Temporarily processing option %s; support is scheduled for removal in %s",
648 flag_name, version_str);
649 return false;
650 }
651 return true;
652 }
653 }
654 }
655 return false;
656 }
657
658 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
659 assert(version != nullptr, "Must provide a version buffer");
660 SpecialFlag flag;
661 if (lookup_special_flag(flag_name, flag)) {
662 if (!flag.deprecated_in.is_undefined()) {
663 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
664 version_less_than(JDK_Version::current(), flag.expired_in)) {
665 *version = flag.deprecated_in;
666 return 1;
667 } else {
668 return -1;
669 }
670 }
671 }
672 return 0;
673 }
674
675 const char* Arguments::real_flag_name(const char *flag_name) {
676 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
677 const AliasedFlag& flag_status = aliased_jvm_flags[i];
678 if (strcmp(flag_status.alias_name, flag_name) == 0) {
679 return flag_status.real_name;
680 }
681 }
682 return flag_name;
683 }
684
685 #ifdef ASSERT
686 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
687 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
688 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
689 return true;
690 }
691 }
692 return false;
693 }
694
695 // Verifies the correctness of the entries in the special_jvm_flags table.
696 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
697 // version being earlier than the deprecation version, then a warning is issued
698 // and verification fails - by returning false. If it is detected that the table
699 // is out of date, with respect to the current version, then ideally a warning is
700 // issued but verification does not fail. This allows the VM to operate when the
701 // version is first updated, without needing to update all the impacted flags at
702 // the same time. In practice we can't issue the warning immediately when the version
703 // is updated as it occurs for every test and some tests are not prepared to handle
704 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
705 // if the check_globals flag is true, and in addition allow a grace period and only
706 // check for stale flags when we hit build 25 (which is far enough into the 6 month
707 // release cycle that all flag updates should have been processed, whilst still
708 // leaving time to make the change before RDP2).
709 // We use a gtest to call this, passing true, so that we can detect stale flags before
710 // the end of the release cycle.
711
712 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
713
714 bool Arguments::verify_special_jvm_flags(bool check_globals) {
715 bool success = true;
716 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
717 const SpecialFlag& flag = special_jvm_flags[i];
718 if (lookup_special_flag(flag.name, i)) {
719 warning("Duplicate special flag declaration \"%s\"", flag.name);
720 success = false;
721 }
722 if (flag.deprecated_in.is_undefined() &&
723 flag.obsolete_in.is_undefined()) {
724 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
725 success = false;
726 }
727
728 if (!flag.deprecated_in.is_undefined()) {
729 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
730 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
731 success = false;
732 }
733
734 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
735 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
736 success = false;
737 }
738 }
739
740 if (!flag.obsolete_in.is_undefined()) {
741 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
742 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
743 success = false;
744 }
745
746 // if flag has become obsolete it should not have a "globals" flag defined anymore.
747 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
748 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
749 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
750 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
751 success = false;
752 }
753 }
754
755 } else if (!flag.expired_in.is_undefined()) {
756 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
757 success = false;
758 }
759
760 if (!flag.expired_in.is_undefined()) {
761 // if flag has become expired it should not have a "globals" flag defined anymore.
762 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
763 !version_less_than(JDK_Version::current(), flag.expired_in)) {
764 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
765 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
766 success = false;
767 }
768 }
769 }
770 }
771 return success;
772 }
773 #endif
774
775 bool Arguments::atojulong(const char *s, julong* result) {
776 return parse_integer(s, result);
777 }
778
779 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
780 if (size < min_size) return arg_too_small;
781 if (size > max_size) return arg_too_big;
782 return arg_in_range;
783 }
784
785 // Describe an argument out of range error
786 void Arguments::describe_range_error(ArgsRange errcode) {
787 switch(errcode) {
788 case arg_too_big:
789 jio_fprintf(defaultStream::error_stream(),
790 "The specified size exceeds the maximum "
791 "representable size.\n");
792 break;
793 case arg_too_small:
794 case arg_unreadable:
795 case arg_in_range:
796 // do nothing for now
797 break;
798 default:
799 ShouldNotReachHere();
800 }
801 }
802
803 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
804 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
805 return true;
806 } else {
807 return false;
808 }
809 }
810
811 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
812 // strtod allows leading whitespace, but our flag format does not.
813 if (*value == '\0' || isspace((unsigned char) *value)) {
814 return false;
815 }
816 char* end;
817 errno = 0;
818 double v = strtod(value, &end);
819 if ((errno != 0) || (*end != 0)) {
820 return false;
821 }
822 if (g_isnan(v) || !g_isfinite(v)) {
823 // Currently we cannot handle these special values.
824 return false;
825 }
826
827 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
828 return true;
829 }
830 return false;
831 }
832
833 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
834 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
835
836 if (flag->is_int()) {
837 int v;
838 if (parse_integer(value, &v)) {
839 result = JVMFlagAccess::set_int(flag, &v, origin);
840 }
841 } else if (flag->is_uint()) {
842 uint v;
843 if (parse_integer(value, &v)) {
844 result = JVMFlagAccess::set_uint(flag, &v, origin);
845 }
846 } else if (flag->is_intx()) {
847 intx v;
848 if (parse_integer(value, &v)) {
849 result = JVMFlagAccess::set_intx(flag, &v, origin);
850 }
851 } else if (flag->is_uintx()) {
852 uintx v;
853 if (parse_integer(value, &v)) {
854 result = JVMFlagAccess::set_uintx(flag, &v, origin);
855 }
856 } else if (flag->is_uint64_t()) {
857 uint64_t v;
858 if (parse_integer(value, &v)) {
859 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
860 }
861 } else if (flag->is_size_t()) {
862 size_t v;
863 if (parse_integer(value, &v)) {
864 result = JVMFlagAccess::set_size_t(flag, &v, origin);
865 }
866 }
867
868 return result == JVMFlag::SUCCESS;
869 }
870
871 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
872 if (value[0] == '\0') {
873 value = nullptr;
874 }
875 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
876 // Contract: JVMFlag always returns a pointer that needs freeing.
877 FREE_C_HEAP_ARRAY(char, value);
878 return true;
879 }
880
881 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
882 const char* old_value = "";
883 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
884 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
885 size_t new_len = strlen(new_value);
886 const char* value;
887 char* free_this_too = nullptr;
888 if (old_len == 0) {
889 value = new_value;
890 } else if (new_len == 0) {
891 value = old_value;
892 } else {
893 size_t length = old_len + 1 + new_len + 1;
894 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
895 // each new setting adds another LINE to the switch:
896 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
897 value = buf;
898 free_this_too = buf;
899 }
900 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
901 // JVMFlag always returns a pointer that needs freeing.
902 FREE_C_HEAP_ARRAY(char, value);
903 // JVMFlag made its own copy, so I must delete my own temp. buffer.
904 FREE_C_HEAP_ARRAY(char, free_this_too);
905 return true;
906 }
907
908 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
909 const char* real_name = real_flag_name(arg);
910 JDK_Version since = JDK_Version();
911 switch (is_deprecated_flag(arg, &since)) {
912 case -1: {
913 // Obsolete or expired, so don't process normally,
914 // but allow for an obsolete flag we're still
915 // temporarily allowing.
916 if (!is_obsolete_flag(arg, &since)) {
917 return real_name;
918 }
919 // Note if we're not considered obsolete then we can't be expired either
920 // as obsoletion must come first.
921 return nullptr;
922 }
923 case 0:
924 return real_name;
925 case 1: {
926 char version[256];
927 since.to_string(version, sizeof(version));
928 if (real_name != arg) {
929 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
930 arg, version, real_name);
931 } else {
932 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
933 arg, version);
934 }
935 return real_name;
936 }
937 }
938 ShouldNotReachHere();
939 return nullptr;
940 }
941
942 #define BUFLEN 255
943
944 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
945 char name_copied[BUFLEN+1];
946 if (name[name_length] != 0) {
947 if (name_length > BUFLEN) {
948 return nullptr;
949 } else {
950 strncpy(name_copied, name, name_length);
951 name_copied[name_length] = '\0';
952 name = name_copied;
953 }
954 }
955
956 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
957 if (real_name == nullptr) {
958 return nullptr;
959 }
960 JVMFlag* flag = JVMFlag::find_flag(real_name);
961 return flag;
962 }
963
964 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
965 bool is_bool = false;
966 bool bool_val = false;
967 char c = *arg;
968 if (c == '+' || c == '-') {
969 is_bool = true;
970 bool_val = (c == '+');
971 arg++;
972 }
973
974 const char* name = arg;
975 while (true) {
976 c = *arg;
977 if (isalnum(c) || (c == '_')) {
978 ++arg;
979 } else {
980 break;
981 }
982 }
983
984 size_t name_len = size_t(arg - name);
985 if (name_len == 0) {
986 return false;
987 }
988
989 JVMFlag* flag = find_jvm_flag(name, name_len);
990 if (flag == nullptr) {
991 return false;
992 }
993
994 if (is_bool) {
995 if (*arg != 0) {
996 // Error -- extra characters such as -XX:+BoolFlag=123
997 return false;
998 }
999 return set_bool_flag(flag, bool_val, origin);
1000 }
1001
1002 if (arg[0] == '=') {
1003 const char* value = arg + 1;
1004 if (flag->is_ccstr()) {
1005 if (flag->ccstr_accumulates()) {
1006 return append_to_string_flag(flag, value, origin);
1007 } else {
1008 return set_string_flag(flag, value, origin);
1009 }
1010 } else if (flag->is_double()) {
1011 return set_fp_numeric_flag(flag, value, origin);
1012 } else {
1013 return set_numeric_flag(flag, value, origin);
1014 }
1015 }
1016
1017 if (arg[0] == ':' && arg[1] == '=') {
1018 // -XX:Foo:=xxx will reset the string flag to the given value.
1019 const char* value = arg + 2;
1020 return set_string_flag(flag, value, origin);
1021 }
1022
1023 return false;
1024 }
1025
1026 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1027 assert(bldarray != nullptr, "illegal argument");
1028
1029 if (arg == nullptr) {
1030 return;
1031 }
1032
1033 int new_count = *count + 1;
1034
1035 // expand the array and add arg to the last element
1036 if (*bldarray == nullptr) {
1037 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1038 } else {
1039 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1040 }
1041 (*bldarray)[*count] = os::strdup_check_oom(arg);
1042 *count = new_count;
1043 }
1044
1045 void Arguments::build_jvm_args(const char* arg) {
1046 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1047 }
1048
1049 void Arguments::build_jvm_flags(const char* arg) {
1050 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1051 }
1052
1053 // utility function to return a string that concatenates all
1054 // strings in a given char** array
1055 const char* Arguments::build_resource_string(char** args, int count) {
1056 if (args == nullptr || count == 0) {
1057 return nullptr;
1058 }
1059 size_t length = 0;
1060 for (int i = 0; i < count; i++) {
1061 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1062 }
1063 char* s = NEW_RESOURCE_ARRAY(char, length);
1064 char* dst = s;
1065 for (int j = 0; j < count; j++) {
1066 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1067 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1068 dst += offset;
1069 length -= offset;
1070 }
1071 return (const char*) s;
1072 }
1073
1074 void Arguments::print_on(outputStream* st) {
1075 st->print_cr("VM Arguments:");
1076 if (num_jvm_flags() > 0) {
1077 st->print("jvm_flags: "); print_jvm_flags_on(st);
1078 st->cr();
1079 }
1080 if (num_jvm_args() > 0) {
1081 st->print("jvm_args: "); print_jvm_args_on(st);
1082 st->cr();
1083 }
1084 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1085 if (_java_class_path != nullptr) {
1086 char* path = _java_class_path->value();
1087 size_t len = strlen(path);
1088 st->print("java_class_path (initial): ");
1089 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1090 if (len == 0) {
1091 st->print_raw_cr("<not set>");
1092 } else {
1093 st->print_raw_cr(path, len);
1094 }
1095 }
1096 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1097 }
1098
1099 void Arguments::print_summary_on(outputStream* st) {
1100 // Print the command line. Environment variables that are helpful for
1101 // reproducing the problem are written later in the hs_err file.
1102 // flags are from setting file
1103 if (num_jvm_flags() > 0) {
1104 st->print_raw("Settings File: ");
1105 print_jvm_flags_on(st);
1106 st->cr();
1107 }
1108 // args are the command line and environment variable arguments.
1109 st->print_raw("Command Line: ");
1110 if (num_jvm_args() > 0) {
1111 print_jvm_args_on(st);
1112 }
1113 // this is the classfile and any arguments to the java program
1114 if (java_command() != nullptr) {
1115 st->print("%s", java_command());
1116 }
1117 st->cr();
1118 }
1119
1120 void Arguments::print_jvm_flags_on(outputStream* st) {
1121 if (_num_jvm_flags > 0) {
1122 for (int i=0; i < _num_jvm_flags; i++) {
1123 st->print("%s ", _jvm_flags_array[i]);
1124 }
1125 }
1126 }
1127
1128 void Arguments::print_jvm_args_on(outputStream* st) {
1129 if (_num_jvm_args > 0) {
1130 for (int i=0; i < _num_jvm_args; i++) {
1131 st->print("%s ", _jvm_args_array[i]);
1132 }
1133 }
1134 }
1135
1136 bool Arguments::process_argument(const char* arg,
1137 jboolean ignore_unrecognized,
1138 JVMFlagOrigin origin) {
1139 JDK_Version since = JDK_Version();
1140
1141 if (parse_argument(arg, origin)) {
1142 return true;
1143 }
1144
1145 // Determine if the flag has '+', '-', or '=' characters.
1146 bool has_plus_minus = (*arg == '+' || *arg == '-');
1147 const char* const argname = has_plus_minus ? arg + 1 : arg;
1148
1149 size_t arg_len;
1150 const char* equal_sign = strchr(argname, '=');
1151 if (equal_sign == nullptr) {
1152 arg_len = strlen(argname);
1153 } else {
1154 arg_len = equal_sign - argname;
1155 }
1156
1157 // Only make the obsolete check for valid arguments.
1158 if (arg_len <= BUFLEN) {
1159 // Construct a string which consists only of the argument name without '+', '-', or '='.
1160 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1161 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1162 if (is_obsolete_flag(stripped_argname, &since)) {
1163 char version[256];
1164 since.to_string(version, sizeof(version));
1165 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1166 return true;
1167 }
1168 }
1169
1170 // For locked flags, report a custom error message if available.
1171 // Otherwise, report the standard unrecognized VM option.
1172 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1173 if (found_flag != nullptr) {
1174 char locked_message_buf[BUFLEN];
1175 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1176 if (strlen(locked_message_buf) != 0) {
1177 #ifdef PRODUCT
1178 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1179 if (ignore_unrecognized && mismatched) {
1180 return true;
1181 }
1182 #endif
1183 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1184 }
1185 if (found_flag->is_bool() && !has_plus_minus) {
1186 jio_fprintf(defaultStream::error_stream(),
1187 "Missing +/- setting for VM option '%s'\n", argname);
1188 } else if (!found_flag->is_bool() && has_plus_minus) {
1189 jio_fprintf(defaultStream::error_stream(),
1190 "Unexpected +/- setting in VM option '%s'\n", argname);
1191 } else {
1192 jio_fprintf(defaultStream::error_stream(),
1193 "Improperly specified VM option '%s'\n", argname);
1194 }
1195 } else {
1196 if (ignore_unrecognized) {
1197 return true;
1198 }
1199 jio_fprintf(defaultStream::error_stream(),
1200 "Unrecognized VM option '%s'\n", argname);
1201 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1202 if (fuzzy_matched != nullptr) {
1203 jio_fprintf(defaultStream::error_stream(),
1204 "Did you mean '%s%s%s'?\n",
1205 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1206 fuzzy_matched->name(),
1207 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1208 }
1209 }
1210
1211 // allow for commandline "commenting out" options like -XX:#+Verbose
1212 return arg[0] == '#';
1213 }
1214
1215 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1216 FILE* stream = os::fopen(file_name, "rb");
1217 if (stream == nullptr) {
1218 if (should_exist) {
1219 jio_fprintf(defaultStream::error_stream(),
1220 "Could not open settings file %s\n", file_name);
1221 return false;
1222 } else {
1223 return true;
1224 }
1225 }
1226
1227 char token[1024];
1228 int pos = 0;
1229
1230 bool in_white_space = true;
1231 bool in_comment = false;
1232 bool in_quote = false;
1233 int quote_c = 0;
1234 bool result = true;
1235
1236 int c = getc(stream);
1237 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1238 if (in_white_space) {
1239 if (in_comment) {
1240 if (c == '\n') in_comment = false;
1241 } else {
1242 if (c == '#') in_comment = true;
1243 else if (!isspace((unsigned char) c)) {
1244 in_white_space = false;
1245 token[pos++] = checked_cast<char>(c);
1246 }
1247 }
1248 } else {
1249 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1250 // token ends at newline, or at unquoted whitespace
1251 // this allows a way to include spaces in string-valued options
1252 token[pos] = '\0';
1253 logOption(token);
1254 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1255 build_jvm_flags(token);
1256 pos = 0;
1257 in_white_space = true;
1258 in_quote = false;
1259 } else if (!in_quote && (c == '\'' || c == '"')) {
1260 in_quote = true;
1261 quote_c = c;
1262 } else if (in_quote && (c == quote_c)) {
1263 in_quote = false;
1264 } else {
1265 token[pos++] = checked_cast<char>(c);
1266 }
1267 }
1268 c = getc(stream);
1269 }
1270 if (pos > 0) {
1271 token[pos] = '\0';
1272 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1273 build_jvm_flags(token);
1274 }
1275 fclose(stream);
1276 return result;
1277 }
1278
1279 //=============================================================================================================
1280 // Parsing of properties (-D)
1281
1282 const char* Arguments::get_property(const char* key) {
1283 return PropertyList_get_value(system_properties(), key);
1284 }
1285
1286 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1287 const char* eq = strchr(prop, '=');
1288 const char* key;
1289 const char* value = "";
1290
1291 if (eq == nullptr) {
1292 // property doesn't have a value, thus use passed string
1293 key = prop;
1294 } else {
1295 // property have a value, thus extract it and save to the
1296 // allocated string
1297 size_t key_len = eq - prop;
1298 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1299
1300 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1301 key = tmp_key;
1302
1303 value = &prop[key_len + 1];
1304 }
1305
1306 if (internal == ExternalProperty) {
1307 CDSConfig::check_incompatible_property(key, value);
1308 }
1309
1310 if (strcmp(key, "java.compiler") == 0) {
1311 // we no longer support java.compiler system property, log a warning and let it get
1312 // passed to Java, like any other system property
1313 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1314 // for applications using NONE or empty value, log a more informative message
1315 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1316 } else {
1317 warning("The java.compiler system property is obsolete and no longer supported.");
1318 }
1319 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1320 // append is true, writable is true, internal is false
1321 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1322 WriteableProperty, ExternalProperty);
1323 } else {
1324 if (strcmp(key, "sun.java.command") == 0) {
1325 char *old_java_command = _java_command;
1326 _java_command = os::strdup_check_oom(value, mtArguments);
1327 if (old_java_command != nullptr) {
1328 os::free(old_java_command);
1329 }
1330 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1331 // If this property is set on the command line then its value will be
1332 // displayed in VM error logs as the URL at which to submit such logs.
1333 // Normally the URL displayed in error logs is different from the value
1334 // of this system property, so a different property should have been
1335 // used here, but we leave this as-is in case someone depends upon it.
1336 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1337 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1338 // its value without going through the property list or making a Java call.
1339 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1340 if (old_java_vendor_url_bug != nullptr) {
1341 os::free((void *)old_java_vendor_url_bug);
1342 }
1343 }
1344
1345 // Create new property and add at the end of the list
1346 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1347 }
1348
1349 if (key != prop) {
1350 // SystemProperty copy passed value, thus free previously allocated
1351 // memory
1352 FreeHeap((void *)key);
1353 }
1354
1355 return true;
1356 }
1357
1358 //===========================================================================================================
1359 // Setting int/mixed/comp mode flags
1360
1361 void Arguments::set_mode_flags(Mode mode) {
1362 // Set up default values for all flags.
1363 // If you add a flag to any of the branches below,
1364 // add a default value for it here.
1365 _mode = mode;
1366
1367 // Ensure Agent_OnLoad has the correct initial values.
1368 // This may not be the final mode; mode may change later in onload phase.
1369 PropertyList_unique_add(&_system_properties, "java.vm.info",
1370 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1371
1372 UseInterpreter = true;
1373 UseCompiler = true;
1374 UseLoopCounter = true;
1375
1376 // Default values may be platform/compiler dependent -
1377 // use the saved values
1378 ClipInlining = Arguments::_ClipInlining;
1379 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1380 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1381 BackgroundCompilation = Arguments::_BackgroundCompilation;
1382
1383 // Change from defaults based on mode
1384 switch (mode) {
1385 default:
1386 ShouldNotReachHere();
1387 break;
1388 case _int:
1389 UseCompiler = false;
1390 UseLoopCounter = false;
1391 AlwaysCompileLoopMethods = false;
1392 UseOnStackReplacement = false;
1393 break;
1394 case _mixed:
1395 // same as default
1396 break;
1397 case _comp:
1398 UseInterpreter = false;
1399 BackgroundCompilation = false;
1400 ClipInlining = false;
1401 break;
1402 }
1403 }
1404
1405 // Conflict: required to use shared spaces (-Xshare:on), but
1406 // incompatible command line options were chosen.
1407 void Arguments::no_shared_spaces(const char* message) {
1408 if (RequireSharedSpaces) {
1409 aot_log_error(aot)("%s is incompatible with other specified options.",
1410 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1411 if (CDSConfig::new_aot_flags_used()) {
1412 vm_exit_during_initialization("Unable to use AOT cache", message);
1413 } else {
1414 vm_exit_during_initialization("Unable to use shared archive", message);
1415 }
1416 } else {
1417 if (CDSConfig::new_aot_flags_used()) {
1418 log_warning(aot)("Unable to use AOT cache: %s", message);
1419 } else {
1420 aot_log_info(aot)("Unable to use shared archive: %s", message);
1421 }
1422 UseSharedSpaces = false;
1423 }
1424 }
1425
1426 static void set_object_alignment() {
1427 // Object alignment.
1428 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1429 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1430 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1431 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1432 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1433 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1434
1435 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1436 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1437
1438 // Oop encoding heap max
1439 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1440 }
1441
1442 size_t Arguments::max_heap_for_compressed_oops() {
1443 // Avoid sign flip.
1444 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1445 // We need to fit both the null page and the heap into the memory budget, while
1446 // keeping alignment constraints of the heap. To guarantee the latter, as the
1447 // null page is located before the heap, we pad the null page to the conservative
1448 // maximum alignment that the GC may ever impose upon the heap.
1449 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1450 _conservative_max_heap_alignment);
1451
1452 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1453 NOT_LP64(ShouldNotReachHere(); return 0);
1454 }
1455
1456 void Arguments::set_use_compressed_oops() {
1457 #ifdef _LP64
1458 // MaxHeapSize is not set up properly at this point, but
1459 // the only value that can override MaxHeapSize if we are
1460 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1461 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1462
1463 if (max_heap_size <= max_heap_for_compressed_oops()) {
1464 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1465 FLAG_SET_ERGO(UseCompressedOops, true);
1466 }
1467 } else {
1468 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1469 warning("Max heap size too large for Compressed Oops");
1470 FLAG_SET_DEFAULT(UseCompressedOops, false);
1471 }
1472 }
1473 #endif // _LP64
1474 }
1475
1476 void Arguments::set_conservative_max_heap_alignment() {
1477 // The conservative maximum required alignment for the heap is the maximum of
1478 // the alignments imposed by several sources: any requirements from the heap
1479 // itself and the maximum page size we may run the VM with.
1480 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1481 _conservative_max_heap_alignment = MAX4(heap_alignment,
1482 os::vm_allocation_granularity(),
1483 os::max_page_size(),
1484 GCArguments::compute_heap_alignment());
1485 }
1486
1487 jint Arguments::set_ergonomics_flags() {
1488 GCConfig::initialize();
1489
1490 set_conservative_max_heap_alignment();
1491
1492 #ifdef _LP64
1493 set_use_compressed_oops();
1494
1495 // Also checks that certain machines are slower with compressed oops
1496 // in vm_version initialization code.
1497 #endif // _LP64
1498
1499 return JNI_OK;
1500 }
1501
1502 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1503 // The AggressiveHeap check is a temporary workaround to avoid calling
1504 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1505 // selected. This works because AggressiveHeap implies UseParallelGC
1506 // where we know the ratio will be 1. Once the AggressiveHeap option is
1507 // removed, this can be cleaned up.
1508 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1509 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1510 size_t max_allocatable = os::commit_memory_limit();
1511
1512 return MIN2(limit, max_allocatable / fraction);
1513 }
1514
1515 // Use static initialization to get the default before parsing
1516 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1517
1518 void Arguments::set_heap_size() {
1519 julong phys_mem;
1520
1521 // If the user specified one of these options, they
1522 // want specific memory sizing so do not limit memory
1523 // based on compressed oops addressability.
1524 // Also, memory limits will be calculated based on
1525 // available os physical memory, not our MaxRAM limit,
1526 // unless MaxRAM is also specified.
1527 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1528 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1529 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1530 !FLAG_IS_DEFAULT(MaxRAM));
1531 if (override_coop_limit) {
1532 if (FLAG_IS_DEFAULT(MaxRAM)) {
1533 phys_mem = os::physical_memory();
1534 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1535 } else {
1536 phys_mem = (julong)MaxRAM;
1537 }
1538 } else {
1539 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1540 : (julong)MaxRAM;
1541 }
1542
1543 // If the maximum heap size has not been set with -Xmx,
1544 // then set it as fraction of the size of physical memory,
1545 // respecting the maximum and minimum sizes of the heap.
1546 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1547 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1548 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1549 if (reasonable_min < MaxHeapSize) {
1550 // Small physical memory, so use a minimum fraction of it for the heap
1551 reasonable_max = reasonable_min;
1552 } else {
1553 // Not-small physical memory, so require a heap at least
1554 // as large as MaxHeapSize
1555 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1556 }
1557
1558 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1559 // Limit the heap size to ErgoHeapSizeLimit
1560 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1561 }
1562
1563 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1564
1565 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1566 // An initial heap size was specified on the command line,
1567 // so be sure that the maximum size is consistent. Done
1568 // after call to limit_heap_by_allocatable_memory because that
1569 // method might reduce the allocation size.
1570 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1571 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1572 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1573 }
1574
1575 #ifdef _LP64
1576 if (UseCompressedOops || UseCompressedClassPointers) {
1577 // HeapBaseMinAddress can be greater than default but not less than.
1578 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1579 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1580 // matches compressed oops printing flags
1581 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu"
1582 " (%zuG) which is greater than value given %zu",
1583 DefaultHeapBaseMinAddress,
1584 DefaultHeapBaseMinAddress/G,
1585 HeapBaseMinAddress);
1586 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1587 }
1588 }
1589 }
1590 if (UseCompressedOops) {
1591 // Limit the heap size to the maximum possible when using compressed oops
1592 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1593
1594 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1595 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1596 // but it should be not less than default MaxHeapSize.
1597 max_coop_heap -= HeapBaseMinAddress;
1598 }
1599
1600 // If user specified flags prioritizing os physical
1601 // memory limits, then disable compressed oops if
1602 // limits exceed max_coop_heap and UseCompressedOops
1603 // was not specified.
1604 if (reasonable_max > max_coop_heap) {
1605 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1606 aot_log_info(aot)("UseCompressedOops disabled due to"
1607 " max heap %zu > compressed oop heap %zu. "
1608 "Please check the setting of MaxRAMPercentage %5.2f."
1609 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1610 FLAG_SET_ERGO(UseCompressedOops, false);
1611 } else {
1612 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1613 }
1614 }
1615 }
1616 #endif // _LP64
1617
1618 log_trace(gc, heap)(" Maximum heap size %zu", (size_t) reasonable_max);
1619 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1620 }
1621
1622 // If the minimum or initial heap_size have not been set or requested to be set
1623 // ergonomically, set them accordingly.
1624 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1625 julong reasonable_minimum = (julong)(OldSize + NewSize);
1626
1627 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1628
1629 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1630
1631 if (InitialHeapSize == 0) {
1632 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1633 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1634
1635 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1636 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1637
1638 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1639 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize);
1640 }
1641 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1642 // synchronize with InitialHeapSize to avoid errors with the default value.
1643 if (MinHeapSize == 0) {
1644 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1645 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize);
1646 }
1647 }
1648 }
1649
1650 // This option inspects the machine and attempts to set various
1651 // parameters to be optimal for long-running, memory allocation
1652 // intensive jobs. It is intended for machines with large
1653 // amounts of cpu and memory.
1654 jint Arguments::set_aggressive_heap_flags() {
1655 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1656 // VM, but we may not be able to represent the total physical memory
1657 // available (like having 8gb of memory on a box but using a 32bit VM).
1658 // Thus, we need to make sure we're using a julong for intermediate
1659 // calculations.
1660 julong initHeapSize;
1661 julong total_memory = os::physical_memory();
1662
1663 if (total_memory < (julong) 256 * M) {
1664 jio_fprintf(defaultStream::error_stream(),
1665 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1666 vm_exit(1);
1667 }
1668
1669 // The heap size is half of available memory, or (at most)
1670 // all of possible memory less 160mb (leaving room for the OS
1671 // when using ISM). This is the maximum; because adaptive sizing
1672 // is turned on below, the actual space used may be smaller.
1673
1674 initHeapSize = MIN2(total_memory / (julong) 2,
1675 total_memory - (julong) 160 * M);
1676
1677 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1678
1679 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1680 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1681 return JNI_EINVAL;
1682 }
1683 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1684 return JNI_EINVAL;
1685 }
1686 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1687 return JNI_EINVAL;
1688 }
1689 }
1690 if (FLAG_IS_DEFAULT(NewSize)) {
1691 // Make the young generation 3/8ths of the total heap.
1692 if (FLAG_SET_CMDLINE(NewSize,
1693 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1694 return JNI_EINVAL;
1695 }
1696 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1697 return JNI_EINVAL;
1698 }
1699 }
1700
1701 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1702 FLAG_SET_DEFAULT(UseLargePages, true);
1703 #endif
1704
1705 // Increase some data structure sizes for efficiency
1706 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1707 return JNI_EINVAL;
1708 }
1709 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1710 return JNI_EINVAL;
1711 }
1712
1713 // See the OldPLABSize comment below, but replace 'after promotion'
1714 // with 'after copying'. YoungPLABSize is the size of the survivor
1715 // space per-gc-thread buffers. The default is 4kw.
1716 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1717 return JNI_EINVAL;
1718 }
1719
1720 // OldPLABSize is the size of the buffers in the old gen that
1721 // UseParallelGC uses to promote live data that doesn't fit in the
1722 // survivor spaces. At any given time, there's one for each gc thread.
1723 // The default size is 1kw. These buffers are rarely used, since the
1724 // survivor spaces are usually big enough. For specjbb, however, there
1725 // are occasions when there's lots of live data in the young gen
1726 // and we end up promoting some of it. We don't have a definite
1727 // explanation for why bumping OldPLABSize helps, but the theory
1728 // is that a bigger PLAB results in retaining something like the
1729 // original allocation order after promotion, which improves mutator
1730 // locality. A minor effect may be that larger PLABs reduce the
1731 // number of PLAB allocation events during gc. The value of 8kw
1732 // was arrived at by experimenting with specjbb.
1733 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1734 return JNI_EINVAL;
1735 }
1736
1737 // Enable parallel GC and adaptive generation sizing
1738 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1739 return JNI_EINVAL;
1740 }
1741
1742 // Encourage steady state memory management
1743 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1744 return JNI_EINVAL;
1745 }
1746
1747 return JNI_OK;
1748 }
1749
1750 // This must be called after ergonomics.
1751 void Arguments::set_bytecode_flags() {
1752 if (!RewriteBytecodes) {
1753 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1754 }
1755 }
1756
1757 // Aggressive optimization flags
1758 jint Arguments::set_aggressive_opts_flags() {
1759 #ifdef COMPILER2
1760 if (AggressiveUnboxing) {
1761 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1762 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1763 } else if (!EliminateAutoBox) {
1764 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1765 AggressiveUnboxing = false;
1766 }
1767 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1768 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1769 } else if (!DoEscapeAnalysis) {
1770 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1771 AggressiveUnboxing = false;
1772 }
1773 }
1774 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1775 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1776 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1777 }
1778 // Feed the cache size setting into the JDK
1779 char buffer[1024];
1780 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1781 if (!add_property(buffer)) {
1782 return JNI_ENOMEM;
1783 }
1784 }
1785 #endif
1786
1787 return JNI_OK;
1788 }
1789
1790 //===========================================================================================================
1791
1792 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1793 if (_sun_java_launcher != _default_java_launcher) {
1794 os::free(const_cast<char*>(_sun_java_launcher));
1795 }
1796 _sun_java_launcher = os::strdup_check_oom(launcher);
1797 }
1798
1799 bool Arguments::created_by_java_launcher() {
1800 assert(_sun_java_launcher != nullptr, "property must have value");
1801 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1802 }
1803
1804 bool Arguments::executing_unit_tests() {
1805 return _executing_unit_tests;
1806 }
1807
1808 //===========================================================================================================
1809 // Parsing of main arguments
1810
1811 static unsigned int addreads_count = 0;
1812 static unsigned int addexports_count = 0;
1813 static unsigned int addopens_count = 0;
1814 static unsigned int enable_native_access_count = 0;
1815 static bool patch_mod_javabase = false;
1816
1817 // Check the consistency of vm_init_args
1818 bool Arguments::check_vm_args_consistency() {
1819 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1820 if (!CDSConfig::check_vm_args_consistency(mode_flag_cmd_line)) {
1821 return false;
1822 }
1823
1824 // Method for adding checks for flag consistency.
1825 // The intent is to warn the user of all possible conflicts,
1826 // before returning an error.
1827 // Note: Needs platform-dependent factoring.
1828 bool status = true;
1829
1830 if (TLABRefillWasteFraction == 0) {
1831 jio_fprintf(defaultStream::error_stream(),
1832 "TLABRefillWasteFraction should be a denominator, "
1833 "not %zu\n",
1834 TLABRefillWasteFraction);
1835 status = false;
1836 }
1837
1838 status = CompilerConfig::check_args_consistency(status);
1839 #if INCLUDE_JVMCI
1840 if (status && EnableJVMCI) {
1841 // Add the JVMCI module if not using libjvmci or EnableJVMCI
1842 // was explicitly set on the command line or in the jimage.
1843 if ((!UseJVMCINativeLibrary || FLAG_IS_CMDLINE(EnableJVMCI) || FLAG_IS_JIMAGE_RESOURCE(EnableJVMCI)) && ClassLoader::is_module_observable("jdk.internal.vm.ci") && !_jvmci_module_added) {
1844 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1845 return false;
1846 }
1847 }
1848 }
1849 #endif
1850
1851 #if INCLUDE_JFR
1852 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1853 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1854 return false;
1855 }
1856 }
1857 #endif
1858
1859 #ifndef SUPPORT_RESERVED_STACK_AREA
1860 if (StackReservedPages != 0) {
1861 FLAG_SET_CMDLINE(StackReservedPages, 0);
1862 warning("Reserved Stack Area not supported on this platform");
1863 }
1864 #endif
1865
1866 if (UseObjectMonitorTable && LockingMode != LM_LIGHTWEIGHT) {
1867 // ObjectMonitorTable requires lightweight locking.
1868 FLAG_SET_CMDLINE(UseObjectMonitorTable, false);
1869 warning("UseObjectMonitorTable requires LM_LIGHTWEIGHT");
1870 }
1871
1872 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1873 if (LockingMode == LM_MONITOR) {
1874 jio_fprintf(defaultStream::error_stream(),
1875 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1876 return false;
1877 }
1878 #endif
1879 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1880 jio_fprintf(defaultStream::error_stream(),
1881 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1882 return false;
1883 }
1884 return status;
1885 }
1886
1887 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1888 const char* option_type) {
1889 if (ignore) return false;
1890
1891 const char* spacer = " ";
1892 if (option_type == nullptr) {
1893 option_type = ++spacer; // Set both to the empty string.
1894 }
1895
1896 jio_fprintf(defaultStream::error_stream(),
1897 "Unrecognized %s%soption: %s\n", option_type, spacer,
1898 option->optionString);
1899 return true;
1900 }
1901
1902 static const char* user_assertion_options[] = {
1903 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1904 };
1905
1906 static const char* system_assertion_options[] = {
1907 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1908 };
1909
1910 bool Arguments::parse_uint(const char* value,
1911 uint* uint_arg,
1912 uint min_size) {
1913 uint n;
1914 if (!parse_integer(value, &n)) {
1915 return false;
1916 }
1917 if (n >= min_size) {
1918 *uint_arg = n;
1919 return true;
1920 } else {
1921 return false;
1922 }
1923 }
1924
1925 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1926 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1927 CDSConfig::check_internal_module_property(prop_name, prop_value);
1928 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1929 char* property = AllocateHeap(prop_len, mtArguments);
1930 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1931 if (ret < 0 || ret >= (int)prop_len) {
1932 FreeHeap(property);
1933 return false;
1934 }
1935 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1936 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1937 // that multiple occurrences of the associated flag just causes the existing property value to be
1938 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1939 // to a property after we have finished flag processing.
1940 bool added = add_property(property, WriteableProperty, internal);
1941 FreeHeap(property);
1942 return added;
1943 }
1944
1945 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1946 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1947 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1948 const unsigned int props_count_limit = 1000;
1949 const int max_digits = 3;
1950 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1951
1952 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1953 if (count < props_count_limit) {
1954 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1955 char* property = AllocateHeap(prop_len, mtArguments);
1956 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1957 if (ret < 0 || ret >= (int)prop_len) {
1958 FreeHeap(property);
1959 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1960 return false;
1961 }
1962 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1963 FreeHeap(property);
1964 return added;
1965 }
1966
1967 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1968 return false;
1969 }
1970
1971 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1972 julong* long_arg,
1973 julong min_size,
1974 julong max_size) {
1975 if (!parse_integer(s, long_arg)) return arg_unreadable;
1976 return check_memory_size(*long_arg, min_size, max_size);
1977 }
1978
1979 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) {
1980 // Save default settings for some mode flags
1981 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1982 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1983 Arguments::_ClipInlining = ClipInlining;
1984 Arguments::_BackgroundCompilation = BackgroundCompilation;
1985
1986 // Remember the default value of SharedBaseAddress.
1987 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1988
1989 // Setup flags for mixed which is the default
1990 set_mode_flags(_mixed);
1991
1992 jint result;
1993 for (int i = 0; i < all_args->length(); i++) {
1994 result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin);
1995 if (result != JNI_OK) {
1996 return result;
1997 }
1998 }
1999
2000 // Disable CDS for exploded image
2001 if (!has_jimage()) {
2002 no_shared_spaces("CDS disabled on exploded JDK");
2003 }
2004
2005 // We need to ensure processor and memory resources have been properly
2006 // configured - which may rely on arguments we just processed - before
2007 // doing the final argument processing. Any argument processing that
2008 // needs to know about processor and memory resources must occur after
2009 // this point.
2010
2011 os::init_container_support();
2012
2013 SystemMemoryBarrier::initialize();
2014
2015 // Do final processing now that all arguments have been parsed
2016 result = finalize_vm_init_args();
2017 if (result != JNI_OK) {
2018 return result;
2019 }
2020
2021 return JNI_OK;
2022 }
2023
2024 #if !INCLUDE_JVMTI || INCLUDE_CDS
2025 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2026 // represents a valid JDWP agent. is_path==true denotes that we
2027 // are dealing with -agentpath (case where name is a path), otherwise with
2028 // -agentlib
2029 static bool valid_jdwp_agent(char *name, bool is_path) {
2030 char *_name;
2031 const char *_jdwp = "jdwp";
2032 size_t _len_jdwp, _len_prefix;
2033
2034 if (is_path) {
2035 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2036 return false;
2037 }
2038
2039 _name++; // skip past last path separator
2040 _len_prefix = strlen(JNI_LIB_PREFIX);
2041
2042 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2043 return false;
2044 }
2045
2046 _name += _len_prefix;
2047 _len_jdwp = strlen(_jdwp);
2048
2049 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2050 _name += _len_jdwp;
2051 }
2052 else {
2053 return false;
2054 }
2055
2056 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2057 return false;
2058 }
2059
2060 return true;
2061 }
2062
2063 if (strcmp(name, _jdwp) == 0) {
2064 return true;
2065 }
2066
2067 return false;
2068 }
2069 #endif
2070
2071 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2072 // --patch-module=<module>=<file>(<pathsep><file>)*
2073 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2074 // Find the equal sign between the module name and the path specification
2075 const char* module_equal = strchr(patch_mod_tail, '=');
2076 if (module_equal == nullptr) {
2077 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2078 return JNI_ERR;
2079 } else {
2080 // Pick out the module name
2081 size_t module_len = module_equal - patch_mod_tail;
2082 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2083 if (module_name != nullptr) {
2084 memcpy(module_name, patch_mod_tail, module_len);
2085 *(module_name + module_len) = '\0';
2086 // The path piece begins one past the module_equal sign
2087 add_patch_mod_prefix(module_name, module_equal + 1, false /* no append */, false /* no cds */);
2088 FREE_C_HEAP_ARRAY(char, module_name);
2089 } else {
2090 return JNI_ENOMEM;
2091 }
2092 }
2093 return JNI_OK;
2094 }
2095
2096 // VALUECLASS_STR must match string used in the build
2097 #define VALUECLASS_STR "valueclasses"
2098 #define VALUECLASS_JAR "-" VALUECLASS_STR ".jar"
2099
2100 // Finalize --patch-module args and --enable-preview related to value class module patches.
2101 // Create all numbered properties passing module patches.
2102 int Arguments::finalize_patch_module() {
2103 // If --enable-preview and EnableValhalla is true, each module may have value classes that
2104 // are to be patched into the module.
2105 // For each <module>-valueclasses.jar in <JAVA_HOME>/lib/valueclasses/
2106 // appends the equivalent of --patch-module <module>=<JAVA_HOME>/lib/valueclasses/<module>-valueclasses.jar
2107 if (enable_preview() && EnableValhalla) {
2108 char * valueclasses_dir = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2109 const char * fileSep = os::file_separator();
2110
2111 jio_snprintf(valueclasses_dir, JVM_MAXPATHLEN, "%s%slib%s" VALUECLASS_STR "%s",
2112 Arguments::get_java_home(), fileSep, fileSep, fileSep);
2113 DIR* dir = os::opendir(valueclasses_dir);
2114 if (dir != nullptr) {
2115 char * module_name = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2116 char * path = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2117
2118 for (dirent * entry = os::readdir(dir); entry != nullptr; entry = os::readdir(dir)) {
2119 // Test if file ends-with "-valueclasses.jar"
2120 int len = (int)strlen(entry->d_name) - (sizeof(VALUECLASS_JAR) - 1);
2121 if (len <= 0 || strcmp(&entry->d_name[len], VALUECLASS_JAR) != 0) {
2122 continue; // too short or not the expected suffix
2123 }
2124
2125 strcpy(module_name, entry->d_name);
2126 module_name[len] = '\0'; // truncate to just module-name
2127
2128 jio_snprintf(path, JVM_MAXPATHLEN, "%s%s", valueclasses_dir, &entry->d_name);
2129 add_patch_mod_prefix(module_name, path, true /* append */, true /* cds OK*/);
2130 log_info(class)("--enable-preview appending value classes for module %s: %s", module_name, entry->d_name);
2131 }
2132 FreeHeap(module_name);
2133 FreeHeap(path);
2134 os::closedir(dir);
2135 }
2136 FreeHeap(valueclasses_dir);
2137 }
2138
2139 // Create numbered properties for each module that has been patched either
2140 // by --patch-module or --enable-preview
2141 // Format is "jdk.module.patch.<n>=<module_name>=<path>"
2142 if (_patch_mod_prefix != nullptr) {
2143 char * prop_value = AllocateHeap(JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, mtArguments);
2144 unsigned int patch_mod_count = 0;
2145
2146 for (GrowableArrayIterator<ModulePatchPath *> it = _patch_mod_prefix->begin();
2147 it != _patch_mod_prefix->end(); ++it) {
2148 jio_snprintf(prop_value, JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, "%s=%s",
2149 (*it)->module_name(), (*it)->path_string());
2150 if (!create_numbered_module_property("jdk.module.patch", prop_value, patch_mod_count++)) {
2151 FreeHeap(prop_value);
2152 return JNI_ENOMEM;
2153 }
2154 }
2155 FreeHeap(prop_value);
2156 }
2157 return JNI_OK;
2158 }
2159
2160 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2161 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2162 // The min and max sizes match the values in globals.hpp, but scaled
2163 // with K. The values have been chosen so that alignment with page
2164 // size doesn't change the max value, which makes the conversions
2165 // back and forth between Xss value and ThreadStackSize value easier.
2166 // The values have also been chosen to fit inside a 32-bit signed type.
2167 const julong min_ThreadStackSize = 0;
2168 const julong max_ThreadStackSize = 1 * M;
2169
2170 // Make sure the above values match the range set in globals.hpp
2171 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2172 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2173 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2174
2175 const julong min_size = min_ThreadStackSize * K;
2176 const julong max_size = max_ThreadStackSize * K;
2177
2178 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2179
2180 julong size = 0;
2181 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2182 if (errcode != arg_in_range) {
2183 bool silent = (option == nullptr); // Allow testing to silence error messages
2184 if (!silent) {
2185 jio_fprintf(defaultStream::error_stream(),
2186 "Invalid thread stack size: %s\n", option->optionString);
2187 describe_range_error(errcode);
2188 }
2189 return JNI_EINVAL;
2190 }
2191
2192 // Internally track ThreadStackSize in units of 1024 bytes.
2193 const julong size_aligned = align_up(size, K);
2194 assert(size <= size_aligned,
2195 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2196 size, size_aligned);
2197
2198 const julong size_in_K = size_aligned / K;
2199 assert(size_in_K < (julong)max_intx,
2200 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2201 size_in_K);
2202
2203 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2204 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2205 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2206 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2207 max_expanded, size_in_K);
2208
2209 *out_ThreadStackSize = (intx)size_in_K;
2210
2211 return JNI_OK;
2212 }
2213
2214 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2215 // For match_option to return remaining or value part of option string
2216 const char* tail;
2217
2218 // iterate over arguments
2219 for (int index = 0; index < args->nOptions; index++) {
2220 bool is_absolute_path = false; // for -agentpath vs -agentlib
2221
2222 const JavaVMOption* option = args->options + index;
2223
2224 if (!match_option(option, "-Djava.class.path", &tail) &&
2225 !match_option(option, "-Dsun.java.command", &tail) &&
2226 !match_option(option, "-Dsun.java.launcher", &tail)) {
2227
2228 // add all jvm options to the jvm_args string. This string
2229 // is used later to set the java.vm.args PerfData string constant.
2230 // the -Djava.class.path and the -Dsun.java.command options are
2231 // omitted from jvm_args string as each have their own PerfData
2232 // string constant object.
2233 build_jvm_args(option->optionString);
2234 }
2235
2236 // -verbose:[class/module/gc/jni]
2237 if (match_option(option, "-verbose", &tail)) {
2238 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2239 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2240 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2241 } else if (!strcmp(tail, ":module")) {
2242 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2243 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2244 } else if (!strcmp(tail, ":gc")) {
2245 if (_legacyGCLogging.lastFlag == 0) {
2246 _legacyGCLogging.lastFlag = 1;
2247 }
2248 } else if (!strcmp(tail, ":jni")) {
2249 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2250 }
2251 // -da / -ea / -disableassertions / -enableassertions
2252 // These accept an optional class/package name separated by a colon, e.g.,
2253 // -da:java.lang.Thread.
2254 } else if (match_option(option, user_assertion_options, &tail, true)) {
2255 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2256 if (*tail == '\0') {
2257 JavaAssertions::setUserClassDefault(enable);
2258 } else {
2259 assert(*tail == ':', "bogus match by match_option()");
2260 JavaAssertions::addOption(tail + 1, enable);
2261 }
2262 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2263 } else if (match_option(option, system_assertion_options, &tail, false)) {
2264 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2265 JavaAssertions::setSystemClassDefault(enable);
2266 // -bootclasspath:
2267 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2268 jio_fprintf(defaultStream::output_stream(),
2269 "-Xbootclasspath is no longer a supported option.\n");
2270 return JNI_EINVAL;
2271 // -bootclasspath/a:
2272 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2273 Arguments::append_sysclasspath(tail);
2274 // -bootclasspath/p:
2275 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2276 jio_fprintf(defaultStream::output_stream(),
2277 "-Xbootclasspath/p is no longer a supported option.\n");
2278 return JNI_EINVAL;
2279 // -Xrun
2280 } else if (match_option(option, "-Xrun", &tail)) {
2281 if (tail != nullptr) {
2282 const char* pos = strchr(tail, ':');
2283 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2284 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2285 jio_snprintf(name, len + 1, "%s", tail);
2286
2287 char *options = nullptr;
2288 if(pos != nullptr) {
2289 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2290 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2291 }
2292 #if !INCLUDE_JVMTI
2293 if (strcmp(name, "jdwp") == 0) {
2294 jio_fprintf(defaultStream::error_stream(),
2295 "Debugging agents are not supported in this VM\n");
2296 return JNI_ERR;
2297 }
2298 #endif // !INCLUDE_JVMTI
2299 JvmtiAgentList::add_xrun(name, options, false);
2300 FREE_C_HEAP_ARRAY(char, name);
2301 FREE_C_HEAP_ARRAY(char, options);
2302 }
2303 } else if (match_option(option, "--add-reads=", &tail)) {
2304 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2305 return JNI_ENOMEM;
2306 }
2307 } else if (match_option(option, "--add-exports=", &tail)) {
2308 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2309 return JNI_ENOMEM;
2310 }
2311 } else if (match_option(option, "--add-opens=", &tail)) {
2312 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2313 return JNI_ENOMEM;
2314 }
2315 } else if (match_option(option, "--add-modules=", &tail)) {
2316 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2317 return JNI_ENOMEM;
2318 }
2319 #if INCLUDE_JVMCI
2320 if (!_jvmci_module_added) {
2321 const char *jvmci_module = strstr(tail, "jdk.internal.vm.ci");
2322 if (jvmci_module != nullptr) {
2323 char before = *(jvmci_module - 1);
2324 char after = *(jvmci_module + strlen("jdk.internal.vm.ci"));
2325 if ((before == '=' || before == ',') && (after == '\0' || after == ',')) {
2326 FLAG_SET_DEFAULT(EnableJVMCI, true);
2327 _jvmci_module_added = true;
2328 }
2329 }
2330 }
2331 #endif
2332 } else if (match_option(option, "--enable-native-access=", &tail)) {
2333 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2334 return JNI_ENOMEM;
2335 }
2336 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2337 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2338 return JNI_ENOMEM;
2339 }
2340 } else if (match_option(option, "--limit-modules=", &tail)) {
2341 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2342 return JNI_ENOMEM;
2343 }
2344 } else if (match_option(option, "--module-path=", &tail)) {
2345 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2346 return JNI_ENOMEM;
2347 }
2348 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2349 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2350 return JNI_ENOMEM;
2351 }
2352 } else if (match_option(option, "--patch-module=", &tail)) {
2353 // --patch-module=<module>=<file>(<pathsep><file>)*
2354 int res = process_patch_mod_option(tail);
2355 if (res != JNI_OK) {
2356 return res;
2357 }
2358 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2359 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2360 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2361 AddProperty, WriteableProperty, InternalProperty);
2362 } else {
2363 jio_fprintf(defaultStream::error_stream(),
2364 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2365 return JNI_ERR;
2366 }
2367 } else if (match_option(option, "--illegal-access=", &tail)) {
2368 char version[256];
2369 JDK_Version::jdk(17).to_string(version, sizeof(version));
2370 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2371 // -agentlib and -agentpath
2372 } else if (match_option(option, "-agentlib:", &tail) ||
2373 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2374 if(tail != nullptr) {
2375 const char* pos = strchr(tail, '=');
2376 char* name;
2377 if (pos == nullptr) {
2378 name = os::strdup_check_oom(tail, mtArguments);
2379 } else {
2380 size_t len = pos - tail;
2381 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2382 memcpy(name, tail, len);
2383 name[len] = '\0';
2384 }
2385
2386 char *options = nullptr;
2387 if(pos != nullptr) {
2388 options = os::strdup_check_oom(pos + 1, mtArguments);
2389 }
2390 #if !INCLUDE_JVMTI
2391 if (valid_jdwp_agent(name, is_absolute_path)) {
2392 jio_fprintf(defaultStream::error_stream(),
2393 "Debugging agents are not supported in this VM\n");
2394 return JNI_ERR;
2395 }
2396 #elif INCLUDE_CDS
2397 if (valid_jdwp_agent(name, is_absolute_path)) {
2398 _has_jdwp_agent = true;
2399 }
2400 #endif // !INCLUDE_JVMTI
2401 JvmtiAgentList::add(name, options, is_absolute_path);
2402 os::free(name);
2403 os::free(options);
2404 }
2405 // -javaagent
2406 } else if (match_option(option, "-javaagent:", &tail)) {
2407 #if !INCLUDE_JVMTI
2408 jio_fprintf(defaultStream::error_stream(),
2409 "Instrumentation agents are not supported in this VM\n");
2410 return JNI_ERR;
2411 #else
2412 if (tail != nullptr) {
2413 size_t length = strlen(tail) + 1;
2414 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2415 jio_snprintf(options, length, "%s", tail);
2416 JvmtiAgentList::add("instrument", options, false);
2417 FREE_C_HEAP_ARRAY(char, options);
2418
2419 // java agents need module java.instrument
2420 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2421 return JNI_ENOMEM;
2422 }
2423 }
2424 #endif // !INCLUDE_JVMTI
2425 // --enable_preview
2426 } else if (match_option(option, "--enable-preview")) {
2427 set_enable_preview();
2428 // --enable-preview enables Valhalla, EnableValhalla VM option will eventually be removed before integration
2429 if (FLAG_SET_CMDLINE(EnableValhalla, true) != JVMFlag::SUCCESS) {
2430 return JNI_EINVAL;
2431 }
2432 // -Xnoclassgc
2433 } else if (match_option(option, "-Xnoclassgc")) {
2434 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2435 return JNI_EINVAL;
2436 }
2437 // -Xbatch
2438 } else if (match_option(option, "-Xbatch")) {
2439 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2440 return JNI_EINVAL;
2441 }
2442 // -Xmn for compatibility with other JVM vendors
2443 } else if (match_option(option, "-Xmn", &tail)) {
2444 julong long_initial_young_size = 0;
2445 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2446 if (errcode != arg_in_range) {
2447 jio_fprintf(defaultStream::error_stream(),
2448 "Invalid initial young generation size: %s\n", option->optionString);
2449 describe_range_error(errcode);
2450 return JNI_EINVAL;
2451 }
2452 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2453 return JNI_EINVAL;
2454 }
2455 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2456 return JNI_EINVAL;
2457 }
2458 // -Xms
2459 } else if (match_option(option, "-Xms", &tail)) {
2460 julong size = 0;
2461 // an initial heap size of 0 means automatically determine
2462 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2463 if (errcode != arg_in_range) {
2464 jio_fprintf(defaultStream::error_stream(),
2465 "Invalid initial heap size: %s\n", option->optionString);
2466 describe_range_error(errcode);
2467 return JNI_EINVAL;
2468 }
2469 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2470 return JNI_EINVAL;
2471 }
2472 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2473 return JNI_EINVAL;
2474 }
2475 // -Xmx
2476 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2477 julong long_max_heap_size = 0;
2478 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2479 if (errcode != arg_in_range) {
2480 jio_fprintf(defaultStream::error_stream(),
2481 "Invalid maximum heap size: %s\n", option->optionString);
2482 describe_range_error(errcode);
2483 return JNI_EINVAL;
2484 }
2485 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2486 return JNI_EINVAL;
2487 }
2488 // Xmaxf
2489 } else if (match_option(option, "-Xmaxf", &tail)) {
2490 char* err;
2491 int maxf = (int)(strtod(tail, &err) * 100);
2492 if (*err != '\0' || *tail == '\0') {
2493 jio_fprintf(defaultStream::error_stream(),
2494 "Bad max heap free percentage size: %s\n",
2495 option->optionString);
2496 return JNI_EINVAL;
2497 } else {
2498 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2499 return JNI_EINVAL;
2500 }
2501 }
2502 // Xminf
2503 } else if (match_option(option, "-Xminf", &tail)) {
2504 char* err;
2505 int minf = (int)(strtod(tail, &err) * 100);
2506 if (*err != '\0' || *tail == '\0') {
2507 jio_fprintf(defaultStream::error_stream(),
2508 "Bad min heap free percentage size: %s\n",
2509 option->optionString);
2510 return JNI_EINVAL;
2511 } else {
2512 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2513 return JNI_EINVAL;
2514 }
2515 }
2516 // -Xss
2517 } else if (match_option(option, "-Xss", &tail)) {
2518 intx value = 0;
2519 jint err = parse_xss(option, tail, &value);
2520 if (err != JNI_OK) {
2521 return err;
2522 }
2523 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2524 return JNI_EINVAL;
2525 }
2526 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2527 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2528 julong long_ReservedCodeCacheSize = 0;
2529
2530 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2531 if (errcode != arg_in_range) {
2532 jio_fprintf(defaultStream::error_stream(),
2533 "Invalid maximum code cache size: %s.\n", option->optionString);
2534 return JNI_EINVAL;
2535 }
2536 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2537 return JNI_EINVAL;
2538 }
2539 // -green
2540 } else if (match_option(option, "-green")) {
2541 jio_fprintf(defaultStream::error_stream(),
2542 "Green threads support not available\n");
2543 return JNI_EINVAL;
2544 // -native
2545 } else if (match_option(option, "-native")) {
2546 // HotSpot always uses native threads, ignore silently for compatibility
2547 // -Xrs
2548 } else if (match_option(option, "-Xrs")) {
2549 // Classic/EVM option, new functionality
2550 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2551 return JNI_EINVAL;
2552 }
2553 // -Xprof
2554 } else if (match_option(option, "-Xprof")) {
2555 char version[256];
2556 // Obsolete in JDK 10
2557 JDK_Version::jdk(10).to_string(version, sizeof(version));
2558 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2559 // -Xinternalversion
2560 } else if (match_option(option, "-Xinternalversion")) {
2561 jio_fprintf(defaultStream::output_stream(), "%s\n",
2562 VM_Version::internal_vm_info_string());
2563 vm_exit(0);
2564 #ifndef PRODUCT
2565 // -Xprintflags
2566 } else if (match_option(option, "-Xprintflags")) {
2567 JVMFlag::printFlags(tty, false);
2568 vm_exit(0);
2569 #endif
2570 // -D
2571 } else if (match_option(option, "-D", &tail)) {
2572 const char* value;
2573 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2574 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2575 // abort if -Djava.endorsed.dirs is set
2576 jio_fprintf(defaultStream::output_stream(),
2577 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2578 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2579 return JNI_EINVAL;
2580 }
2581 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2582 *value != '\0' && strcmp(value, "\"\"") != 0) {
2583 // abort if -Djava.ext.dirs is set
2584 jio_fprintf(defaultStream::output_stream(),
2585 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2586 return JNI_EINVAL;
2587 }
2588 // Check for module related properties. They must be set using the modules
2589 // options. For example: use "--add-modules=java.sql", not
2590 // "-Djdk.module.addmods=java.sql"
2591 if (is_internal_module_property(option->optionString + 2)) {
2592 needs_module_property_warning = true;
2593 continue;
2594 }
2595 if (!add_property(tail)) {
2596 return JNI_ENOMEM;
2597 }
2598 // Out of the box management support
2599 if (match_option(option, "-Dcom.sun.management", &tail)) {
2600 #if INCLUDE_MANAGEMENT
2601 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2602 return JNI_EINVAL;
2603 }
2604 // management agent in module jdk.management.agent
2605 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2606 return JNI_ENOMEM;
2607 }
2608 #else
2609 jio_fprintf(defaultStream::output_stream(),
2610 "-Dcom.sun.management is not supported in this VM.\n");
2611 return JNI_ERR;
2612 #endif
2613 }
2614 // -Xint
2615 } else if (match_option(option, "-Xint")) {
2616 set_mode_flags(_int);
2617 mode_flag_cmd_line = true;
2618 // -Xmixed
2619 } else if (match_option(option, "-Xmixed")) {
2620 set_mode_flags(_mixed);
2621 mode_flag_cmd_line = true;
2622 // -Xcomp
2623 } else if (match_option(option, "-Xcomp")) {
2624 // for testing the compiler; turn off all flags that inhibit compilation
2625 set_mode_flags(_comp);
2626 mode_flag_cmd_line = true;
2627 // -Xshare:dump
2628 } else if (match_option(option, "-Xshare:dump")) {
2629 CDSConfig::enable_dumping_static_archive();
2630 CDSConfig::set_old_cds_flags_used();
2631 // -Xshare:on
2632 } else if (match_option(option, "-Xshare:on")) {
2633 UseSharedSpaces = true;
2634 RequireSharedSpaces = true;
2635 CDSConfig::set_old_cds_flags_used();
2636 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2637 } else if (match_option(option, "-Xshare:auto")) {
2638 UseSharedSpaces = true;
2639 RequireSharedSpaces = false;
2640 xshare_auto_cmd_line = true;
2641 CDSConfig::set_old_cds_flags_used();
2642 // -Xshare:off
2643 } else if (match_option(option, "-Xshare:off")) {
2644 UseSharedSpaces = false;
2645 RequireSharedSpaces = false;
2646 CDSConfig::set_old_cds_flags_used();
2647 // -Xverify
2648 } else if (match_option(option, "-Xverify", &tail)) {
2649 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2650 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2651 return JNI_EINVAL;
2652 }
2653 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2654 return JNI_EINVAL;
2655 }
2656 } else if (strcmp(tail, ":remote") == 0) {
2657 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2658 return JNI_EINVAL;
2659 }
2660 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2661 return JNI_EINVAL;
2662 }
2663 } else if (strcmp(tail, ":none") == 0) {
2664 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2665 return JNI_EINVAL;
2666 }
2667 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2668 return JNI_EINVAL;
2669 }
2670 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2671 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2672 return JNI_EINVAL;
2673 }
2674 // -Xdebug
2675 } else if (match_option(option, "-Xdebug")) {
2676 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2677 } else if (match_option(option, "-Xloggc:", &tail)) {
2678 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2679 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2680 _legacyGCLogging.lastFlag = 2;
2681 _legacyGCLogging.file = os::strdup_check_oom(tail);
2682 } else if (match_option(option, "-Xlog", &tail)) {
2683 bool ret = false;
2684 if (strcmp(tail, ":help") == 0) {
2685 fileStream stream(defaultStream::output_stream());
2686 LogConfiguration::print_command_line_help(&stream);
2687 vm_exit(0);
2688 } else if (strcmp(tail, ":disable") == 0) {
2689 LogConfiguration::disable_logging();
2690 ret = true;
2691 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2692 const char* async_tail = tail + strlen(":async");
2693 ret = LogConfiguration::parse_async_argument(async_tail);
2694 } else if (*tail == '\0') {
2695 ret = LogConfiguration::parse_command_line_arguments();
2696 assert(ret, "-Xlog without arguments should never fail to parse");
2697 } else if (*tail == ':') {
2698 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2699 }
2700 if (ret == false) {
2701 jio_fprintf(defaultStream::error_stream(),
2702 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2703 tail);
2704 return JNI_EINVAL;
2705 }
2706 // JNI hooks
2707 } else if (match_option(option, "-Xcheck", &tail)) {
2708 if (!strcmp(tail, ":jni")) {
2709 #if !INCLUDE_JNI_CHECK
2710 warning("JNI CHECKING is not supported in this VM");
2711 #else
2712 CheckJNICalls = true;
2713 #endif // INCLUDE_JNI_CHECK
2714 } else if (is_bad_option(option, args->ignoreUnrecognized,
2715 "check")) {
2716 return JNI_EINVAL;
2717 }
2718 } else if (match_option(option, "vfprintf")) {
2719 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2720 } else if (match_option(option, "exit")) {
2721 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2722 } else if (match_option(option, "abort")) {
2723 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2724 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2725 // and the last option wins.
2726 } else if (match_option(option, "-XX:+NeverTenure")) {
2727 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2728 return JNI_EINVAL;
2729 }
2730 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2731 return JNI_EINVAL;
2732 }
2733 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2734 return JNI_EINVAL;
2735 }
2736 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2737 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2738 return JNI_EINVAL;
2739 }
2740 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2741 return JNI_EINVAL;
2742 }
2743 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2744 return JNI_EINVAL;
2745 }
2746 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2747 uint max_tenuring_thresh = 0;
2748 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2749 jio_fprintf(defaultStream::error_stream(),
2750 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2751 return JNI_EINVAL;
2752 }
2753
2754 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2755 return JNI_EINVAL;
2756 }
2757
2758 if (MaxTenuringThreshold == 0) {
2759 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2760 return JNI_EINVAL;
2761 }
2762 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2763 return JNI_EINVAL;
2764 }
2765 } else {
2766 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2767 return JNI_EINVAL;
2768 }
2769 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2770 return JNI_EINVAL;
2771 }
2772 }
2773 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2774 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2775 return JNI_EINVAL;
2776 }
2777 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2778 return JNI_EINVAL;
2779 }
2780 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2781 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2782 return JNI_EINVAL;
2783 }
2784 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2785 return JNI_EINVAL;
2786 }
2787 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2788 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2789 return JNI_EINVAL;
2790 }
2791 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2792 return JNI_EINVAL;
2793 }
2794 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2795 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2796 return JNI_EINVAL;
2797 }
2798 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2799 return JNI_EINVAL;
2800 }
2801 } else if (match_option(option, "--finalization=", &tail)) {
2802 if (strcmp(tail, "enabled") == 0) {
2803 InstanceKlass::set_finalization_enabled(true);
2804 } else if (strcmp(tail, "disabled") == 0) {
2805 InstanceKlass::set_finalization_enabled(false);
2806 } else {
2807 jio_fprintf(defaultStream::error_stream(),
2808 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2809 tail);
2810 return JNI_EINVAL;
2811 }
2812 #if !defined(DTRACE_ENABLED)
2813 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2814 jio_fprintf(defaultStream::error_stream(),
2815 "DTraceMethodProbes flag is not applicable for this configuration\n");
2816 return JNI_EINVAL;
2817 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2818 jio_fprintf(defaultStream::error_stream(),
2819 "DTraceAllocProbes flag is not applicable for this configuration\n");
2820 return JNI_EINVAL;
2821 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2822 jio_fprintf(defaultStream::error_stream(),
2823 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2824 return JNI_EINVAL;
2825 #endif // !defined(DTRACE_ENABLED)
2826 #ifdef ASSERT
2827 } else if (match_option(option, "-XX:+FullGCALot")) {
2828 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2829 return JNI_EINVAL;
2830 }
2831 #endif
2832 #if !INCLUDE_MANAGEMENT
2833 } else if (match_option(option, "-XX:+ManagementServer")) {
2834 jio_fprintf(defaultStream::error_stream(),
2835 "ManagementServer is not supported in this VM.\n");
2836 return JNI_ERR;
2837 #endif // INCLUDE_MANAGEMENT
2838 #if INCLUDE_JVMCI
2839 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2840 if (EnableJVMCIProduct) {
2841 jio_fprintf(defaultStream::error_stream(),
2842 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2843 return JNI_EINVAL;
2844 }
2845 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2846 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2847 if (use_graal_jit) {
2848 const char* jvmci_compiler = get_property("jvmci.Compiler");
2849 if (jvmci_compiler != nullptr) {
2850 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2851 jio_fprintf(defaultStream::error_stream(),
2852 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2853 return JNI_ERR;
2854 }
2855 } else if (!add_property("jvmci.Compiler=graal")) {
2856 return JNI_ENOMEM;
2857 }
2858 }
2859
2860 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2861 if (EnableJVMCIProduct) {
2862 continue;
2863 }
2864 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2865 // Allow this flag if it has been unlocked.
2866 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2867 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2868 jio_fprintf(defaultStream::error_stream(),
2869 "Unable to enable JVMCI in product mode\n");
2870 return JNI_ERR;
2871 }
2872 }
2873 // The flag was locked so process normally to report that error
2874 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2875 return JNI_EINVAL;
2876 }
2877 #endif // INCLUDE_JVMCI
2878 #if INCLUDE_JFR
2879 } else if (match_jfr_option(&option)) {
2880 return JNI_EINVAL;
2881 #endif
2882 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2883 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2884 // already been handled
2885 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2886 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2887 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2888 return JNI_EINVAL;
2889 }
2890 }
2891 // Unknown option
2892 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2893 return JNI_ERR;
2894 }
2895 }
2896
2897 // PrintSharedArchiveAndExit will turn on
2898 // -Xshare:on
2899 // -Xlog:class+path=info
2900 if (PrintSharedArchiveAndExit) {
2901 UseSharedSpaces = true;
2902 RequireSharedSpaces = true;
2903 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2904 }
2905
2906 fix_appclasspath();
2907
2908 return JNI_OK;
2909 }
2910
2911 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool allow_append, bool allow_cds) {
2912 if (!allow_cds) {
2913 CDSConfig::set_module_patching_disables_cds();
2914 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2915 CDSConfig::set_java_base_module_patching_disables_cds();
2916 }
2917 }
2918
2919 // Create GrowableArray lazily, only if --patch-module has been specified
2920 if (_patch_mod_prefix == nullptr) {
2921 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2922 }
2923
2924 // Scan patches for matching module
2925 int i = _patch_mod_prefix->find_if([&](ModulePatchPath* patch) {
2926 return (strcmp(module_name, patch->module_name()) == 0);
2927 });
2928 if (i == -1) {
2929 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2930 } else {
2931 if (allow_append) {
2932 // append path to existing module entry
2933 _patch_mod_prefix->at(i)->append_path(path);
2934 } else {
2935 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2936 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2937 } else {
2938 vm_exit_during_initialization("Cannot specify a module more than once to --patch-module", module_name);
2939 }
2940 }
2941 }
2942 }
2943
2944 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2945 //
2946 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2947 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2948 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2949 // path is treated as the current directory.
2950 //
2951 // This causes problems with CDS, which requires that all directories specified in the classpath
2952 // must be empty. In most cases, applications do NOT want to load classes from the current
2953 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2954 // scripts compatible with CDS.
2955 void Arguments::fix_appclasspath() {
2956 if (IgnoreEmptyClassPaths) {
2957 const char separator = *os::path_separator();
2958 const char* src = _java_class_path->value();
2959
2960 // skip over all the leading empty paths
2961 while (*src == separator) {
2962 src ++;
2963 }
2964
2965 char* copy = os::strdup_check_oom(src, mtArguments);
2966
2967 // trim all trailing empty paths
2968 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2969 *tail = '\0';
2970 }
2971
2972 char from[3] = {separator, separator, '\0'};
2973 char to [2] = {separator, '\0'};
2974 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2975 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2976 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2977 }
2978
2979 _java_class_path->set_writeable_value(copy);
2980 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2981 }
2982 }
2983
2984 jint Arguments::finalize_vm_init_args() {
2985 // check if the default lib/endorsed directory exists; if so, error
2986 char path[JVM_MAXPATHLEN];
2987 const char* fileSep = os::file_separator();
2988 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2989
2990 DIR* dir = os::opendir(path);
2991 if (dir != nullptr) {
2992 jio_fprintf(defaultStream::output_stream(),
2993 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2994 "in modular form will be supported via the concept of upgradeable modules.\n");
2995 os::closedir(dir);
2996 return JNI_ERR;
2997 }
2998
2999 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3000 dir = os::opendir(path);
3001 if (dir != nullptr) {
3002 jio_fprintf(defaultStream::output_stream(),
3003 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3004 "Use -classpath instead.\n.");
3005 os::closedir(dir);
3006 return JNI_ERR;
3007 }
3008
3009 // This must be done after all arguments have been processed
3010 // and the container support has been initialized since AggressiveHeap
3011 // relies on the amount of total memory available.
3012 if (AggressiveHeap) {
3013 jint result = set_aggressive_heap_flags();
3014 if (result != JNI_OK) {
3015 return result;
3016 }
3017 }
3018
3019 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3020 // but like -Xint, leave compilation thresholds unaffected.
3021 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3022 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3023 set_mode_flags(_int);
3024 }
3025
3026 #ifdef ZERO
3027 // Zero always runs in interpreted mode
3028 set_mode_flags(_int);
3029 #endif
3030
3031 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3032 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3033 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3034 }
3035
3036 #if !COMPILER2_OR_JVMCI
3037 // Don't degrade server performance for footprint
3038 if (FLAG_IS_DEFAULT(UseLargePages) &&
3039 MaxHeapSize < LargePageHeapSizeThreshold) {
3040 // No need for large granularity pages w/small heaps.
3041 // Note that large pages are enabled/disabled for both the
3042 // Java heap and the code cache.
3043 FLAG_SET_DEFAULT(UseLargePages, false);
3044 }
3045
3046 UNSUPPORTED_OPTION(ProfileInterpreter);
3047 #endif
3048
3049 // Parse the CompilationMode flag
3050 if (!CompilationModeFlag::initialize()) {
3051 return JNI_ERR;
3052 }
3053
3054 // finalize --module-patch and related --enable-preview
3055 if (finalize_patch_module() != JNI_OK) {
3056 return JNI_ERR;
3057 }
3058
3059 if (!check_vm_args_consistency()) {
3060 return JNI_ERR;
3061 }
3062
3063 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3064 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3065 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3066
3067 return JNI_OK;
3068 }
3069
3070 // Helper class for controlling the lifetime of JavaVMInitArgs
3071 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3072 // deleted on the destruction of the ScopedVMInitArgs object.
3073 class ScopedVMInitArgs : public StackObj {
3074 private:
3075 JavaVMInitArgs _args;
3076 char* _container_name;
3077 bool _is_set;
3078 char* _vm_options_file_arg;
3079
3080 public:
3081 ScopedVMInitArgs(const char *container_name) {
3082 _args.version = JNI_VERSION_1_2;
3083 _args.nOptions = 0;
3084 _args.options = nullptr;
3085 _args.ignoreUnrecognized = false;
3086 _container_name = (char *)container_name;
3087 _is_set = false;
3088 _vm_options_file_arg = nullptr;
3089 }
3090
3091 // Populates the JavaVMInitArgs object represented by this
3092 // ScopedVMInitArgs object with the arguments in options. The
3093 // allocated memory is deleted by the destructor. If this method
3094 // returns anything other than JNI_OK, then this object is in a
3095 // partially constructed state, and should be abandoned.
3096 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3097 _is_set = true;
3098 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3099 JavaVMOption, options->length(), mtArguments);
3100 if (options_arr == nullptr) {
3101 return JNI_ENOMEM;
3102 }
3103 _args.options = options_arr;
3104
3105 for (int i = 0; i < options->length(); i++) {
3106 options_arr[i] = options->at(i);
3107 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3108 if (options_arr[i].optionString == nullptr) {
3109 // Rely on the destructor to do cleanup.
3110 _args.nOptions = i;
3111 return JNI_ENOMEM;
3112 }
3113 }
3114
3115 _args.nOptions = options->length();
3116 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3117 return JNI_OK;
3118 }
3119
3120 JavaVMInitArgs* get() { return &_args; }
3121 char* container_name() { return _container_name; }
3122 bool is_set() { return _is_set; }
3123 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3124 char* vm_options_file_arg() { return _vm_options_file_arg; }
3125
3126 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3127 if (_vm_options_file_arg != nullptr) {
3128 os::free(_vm_options_file_arg);
3129 }
3130 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3131 }
3132
3133 ~ScopedVMInitArgs() {
3134 if (_vm_options_file_arg != nullptr) {
3135 os::free(_vm_options_file_arg);
3136 }
3137 if (_args.options == nullptr) return;
3138 for (int i = 0; i < _args.nOptions; i++) {
3139 os::free(_args.options[i].optionString);
3140 }
3141 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3142 }
3143
3144 // Insert options into this option list, to replace option at
3145 // vm_options_file_pos (-XX:VMOptionsFile)
3146 jint insert(const JavaVMInitArgs* args,
3147 const JavaVMInitArgs* args_to_insert,
3148 const int vm_options_file_pos) {
3149 assert(_args.options == nullptr, "shouldn't be set yet");
3150 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3151 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3152
3153 int length = args->nOptions + args_to_insert->nOptions - 1;
3154 // Construct new option array
3155 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3156 for (int i = 0; i < args->nOptions; i++) {
3157 if (i == vm_options_file_pos) {
3158 // insert the new options starting at the same place as the
3159 // -XX:VMOptionsFile option
3160 for (int j = 0; j < args_to_insert->nOptions; j++) {
3161 options.push(args_to_insert->options[j]);
3162 }
3163 } else {
3164 options.push(args->options[i]);
3165 }
3166 }
3167 // make into options array
3168 return set_args(&options);
3169 }
3170 };
3171
3172 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3173 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3174 }
3175
3176 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3177 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3178 }
3179
3180 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) {
3181 for (int index = args->nOptions - 1; index >= 0; index--) {
3182 JavaVMOption* option = args->options + index;
3183 if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) {
3184 return option;
3185 }
3186 }
3187
3188 return nullptr;
3189 }
3190
3191 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args,
3192 ScopedVMInitArgs* jdk_aot_vm_options_args) {
3193 // Don't bother scanning all the args if this env variable is not set
3194 if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) {
3195 return JNI_OK;
3196 }
3197
3198 // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value
3199 // of AOTMode.
3200 JavaVMOption* option = nullptr;
3201 for (int i = all_args->length() - 1; i >= 0; i--) {
3202 if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) {
3203 break;
3204 }
3205 }
3206
3207 if (option != nullptr) {
3208 // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet,
3209 // so its value is not reflected inside the global variable AOTMode.
3210 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) {
3211 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3212 }
3213 } else {
3214 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode,
3215 // which would have been set inside process_settings_file();
3216 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) {
3217 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3218 }
3219 }
3220
3221 return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args);
3222 }
3223
3224 jint Arguments::parse_options_environment_variable(const char* name,
3225 ScopedVMInitArgs* vm_args) {
3226 char *buffer = ::getenv(name);
3227
3228 // Don't check this environment variable if user has special privileges
3229 // (e.g. unix su command).
3230 if (buffer == nullptr || os::have_special_privileges()) {
3231 return JNI_OK;
3232 }
3233
3234 if ((buffer = os::strdup(buffer)) == nullptr) {
3235 return JNI_ENOMEM;
3236 }
3237
3238 jio_fprintf(defaultStream::error_stream(),
3239 "Picked up %s: %s\n", name, buffer);
3240
3241 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3242
3243 os::free(buffer);
3244 return retcode;
3245 }
3246
3247 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3248 // read file into buffer
3249 int fd = ::open(file_name, O_RDONLY);
3250 if (fd < 0) {
3251 jio_fprintf(defaultStream::error_stream(),
3252 "Could not open options file '%s'\n",
3253 file_name);
3254 return JNI_ERR;
3255 }
3256
3257 struct stat stbuf;
3258 int retcode = os::stat(file_name, &stbuf);
3259 if (retcode != 0) {
3260 jio_fprintf(defaultStream::error_stream(),
3261 "Could not stat options file '%s'\n",
3262 file_name);
3263 ::close(fd);
3264 return JNI_ERR;
3265 }
3266
3267 if (stbuf.st_size == 0) {
3268 // tell caller there is no option data and that is ok
3269 ::close(fd);
3270 return JNI_OK;
3271 }
3272
3273 // '+ 1' for null termination even with max bytes
3274 size_t bytes_alloc = stbuf.st_size + 1;
3275
3276 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3277 if (nullptr == buf) {
3278 jio_fprintf(defaultStream::error_stream(),
3279 "Could not allocate read buffer for options file parse\n");
3280 ::close(fd);
3281 return JNI_ENOMEM;
3282 }
3283
3284 memset(buf, 0, bytes_alloc);
3285
3286 // Fill buffer
3287 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3288 ::close(fd);
3289 if (bytes_read < 0) {
3290 FREE_C_HEAP_ARRAY(char, buf);
3291 jio_fprintf(defaultStream::error_stream(),
3292 "Could not read options file '%s'\n", file_name);
3293 return JNI_ERR;
3294 }
3295
3296 if (bytes_read == 0) {
3297 // tell caller there is no option data and that is ok
3298 FREE_C_HEAP_ARRAY(char, buf);
3299 return JNI_OK;
3300 }
3301
3302 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3303
3304 FREE_C_HEAP_ARRAY(char, buf);
3305 return retcode;
3306 }
3307
3308 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3309 // Construct option array
3310 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3311
3312 // some pointers to help with parsing
3313 char *buffer_end = buffer + buf_len;
3314 char *opt_hd = buffer;
3315 char *wrt = buffer;
3316 char *rd = buffer;
3317
3318 // parse all options
3319 while (rd < buffer_end) {
3320 // skip leading white space from the input string
3321 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3322 rd++;
3323 }
3324
3325 if (rd >= buffer_end) {
3326 break;
3327 }
3328
3329 // Remember this is where we found the head of the token.
3330 opt_hd = wrt;
3331
3332 // Tokens are strings of non white space characters separated
3333 // by one or more white spaces.
3334 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3335 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3336 int quote = *rd; // matching quote to look for
3337 rd++; // don't copy open quote
3338 while (rd < buffer_end && *rd != quote) {
3339 // include everything (even spaces)
3340 // up until the close quote
3341 *wrt++ = *rd++; // copy to option string
3342 }
3343
3344 if (rd < buffer_end) {
3345 rd++; // don't copy close quote
3346 } else {
3347 // did not see closing quote
3348 jio_fprintf(defaultStream::error_stream(),
3349 "Unmatched quote in %s\n", name);
3350 return JNI_ERR;
3351 }
3352 } else {
3353 *wrt++ = *rd++; // copy to option string
3354 }
3355 }
3356
3357 // steal a white space character and set it to null
3358 *wrt++ = '\0';
3359 // We now have a complete token
3360
3361 JavaVMOption option;
3362 option.optionString = opt_hd;
3363 option.extraInfo = nullptr;
3364
3365 options.append(option); // Fill in option
3366
3367 rd++; // Advance to next character
3368 }
3369
3370 // Fill out JavaVMInitArgs structure.
3371 return vm_args->set_args(&options);
3372 }
3373
3374 #ifndef PRODUCT
3375 // Determine whether LogVMOutput should be implicitly turned on.
3376 static bool use_vm_log() {
3377 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3378 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3379 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3380 PrintAssembly || TraceDeoptimization ||
3381 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3382 return true;
3383 }
3384
3385 #ifdef COMPILER1
3386 if (PrintC1Statistics) {
3387 return true;
3388 }
3389 #endif // COMPILER1
3390
3391 #ifdef COMPILER2
3392 if (PrintOptoAssembly || PrintOptoStatistics) {
3393 return true;
3394 }
3395 #endif // COMPILER2
3396
3397 return false;
3398 }
3399
3400 #endif // PRODUCT
3401
3402 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3403 for (int index = 0; index < args->nOptions; index++) {
3404 const JavaVMOption* option = args->options + index;
3405 const char* tail;
3406 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3407 return true;
3408 }
3409 }
3410 return false;
3411 }
3412
3413 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3414 const char* vm_options_file,
3415 const int vm_options_file_pos,
3416 ScopedVMInitArgs* vm_options_file_args,
3417 ScopedVMInitArgs* args_out) {
3418 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3419 if (code != JNI_OK) {
3420 return code;
3421 }
3422
3423 if (vm_options_file_args->get()->nOptions < 1) {
3424 return JNI_OK;
3425 }
3426
3427 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3428 jio_fprintf(defaultStream::error_stream(),
3429 "A VM options file may not refer to a VM options file. "
3430 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3431 "options file '%s' in options container '%s' is an error.\n",
3432 vm_options_file_args->vm_options_file_arg(),
3433 vm_options_file_args->container_name());
3434 return JNI_EINVAL;
3435 }
3436
3437 return args_out->insert(args, vm_options_file_args->get(),
3438 vm_options_file_pos);
3439 }
3440
3441 // Expand -XX:VMOptionsFile found in args_in as needed.
3442 // mod_args and args_out parameters may return values as needed.
3443 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3444 ScopedVMInitArgs* mod_args,
3445 JavaVMInitArgs** args_out) {
3446 jint code = match_special_option_and_act(args_in, mod_args);
3447 if (code != JNI_OK) {
3448 return code;
3449 }
3450
3451 if (mod_args->is_set()) {
3452 // args_in contains -XX:VMOptionsFile and mod_args contains the
3453 // original options from args_in along with the options expanded
3454 // from the VMOptionsFile. Return a short-hand to the caller.
3455 *args_out = mod_args->get();
3456 } else {
3457 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3458 }
3459 return JNI_OK;
3460 }
3461
3462 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3463 ScopedVMInitArgs* args_out) {
3464 // Remaining part of option string
3465 const char* tail;
3466 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3467
3468 for (int index = 0; index < args->nOptions; index++) {
3469 const JavaVMOption* option = args->options + index;
3470 if (match_option(option, "-XX:Flags=", &tail)) {
3471 Arguments::set_jvm_flags_file(tail);
3472 continue;
3473 }
3474 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3475 if (vm_options_file_args.found_vm_options_file_arg()) {
3476 jio_fprintf(defaultStream::error_stream(),
3477 "The option '%s' is already specified in the options "
3478 "container '%s' so the specification of '%s' in the "
3479 "same options container is an error.\n",
3480 vm_options_file_args.vm_options_file_arg(),
3481 vm_options_file_args.container_name(),
3482 option->optionString);
3483 return JNI_EINVAL;
3484 }
3485 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3486 // If there's a VMOptionsFile, parse that
3487 jint code = insert_vm_options_file(args, tail, index,
3488 &vm_options_file_args, args_out);
3489 if (code != JNI_OK) {
3490 return code;
3491 }
3492 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3493 if (args_out->is_set()) {
3494 // The VMOptions file inserted some options so switch 'args'
3495 // to the new set of options, and continue processing which
3496 // preserves "last option wins" semantics.
3497 args = args_out->get();
3498 // The first option from the VMOptionsFile replaces the
3499 // current option. So we back track to process the
3500 // replacement option.
3501 index--;
3502 }
3503 continue;
3504 }
3505 if (match_option(option, "-XX:+PrintVMOptions")) {
3506 PrintVMOptions = true;
3507 continue;
3508 }
3509 if (match_option(option, "-XX:-PrintVMOptions")) {
3510 PrintVMOptions = false;
3511 continue;
3512 }
3513 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3514 IgnoreUnrecognizedVMOptions = true;
3515 continue;
3516 }
3517 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3518 IgnoreUnrecognizedVMOptions = false;
3519 continue;
3520 }
3521 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3522 JVMFlag::printFlags(tty, false);
3523 vm_exit(0);
3524 }
3525
3526 #ifndef PRODUCT
3527 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3528 JVMFlag::printFlags(tty, true);
3529 vm_exit(0);
3530 }
3531 #endif
3532 }
3533 return JNI_OK;
3534 }
3535
3536 static void print_options(const JavaVMInitArgs *args) {
3537 const char* tail;
3538 for (int index = 0; index < args->nOptions; index++) {
3539 const JavaVMOption *option = args->options + index;
3540 if (match_option(option, "-XX:", &tail)) {
3541 logOption(tail);
3542 }
3543 }
3544 }
3545
3546 bool Arguments::handle_deprecated_print_gc_flags() {
3547 if (PrintGC) {
3548 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3549 }
3550 if (PrintGCDetails) {
3551 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3552 }
3553
3554 if (_legacyGCLogging.lastFlag == 2) {
3555 // -Xloggc was used to specify a filename
3556 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3557
3558 LogTarget(Error, logging) target;
3559 LogStream errstream(target);
3560 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3561 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3562 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3563 }
3564 return true;
3565 }
3566
3567 static void apply_debugger_ergo() {
3568 #ifdef ASSERT
3569 if (ReplayCompiles) {
3570 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3571 }
3572
3573 if (UseDebuggerErgo) {
3574 // Turn on sub-flags
3575 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3576 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3577 }
3578
3579 if (UseDebuggerErgo2) {
3580 // Debugging with limited number of CPUs
3581 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3582 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3583 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3584 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3585 }
3586 #endif // ASSERT
3587 }
3588
3589 // Parse entry point called from JNI_CreateJavaVM
3590
3591 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3592 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3593 JVMFlag::check_all_flag_declarations();
3594
3595 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3596 const char* hotspotrc = ".hotspotrc";
3597 bool settings_file_specified = false;
3598 bool needs_hotspotrc_warning = false;
3599 ScopedVMInitArgs initial_vm_options_args("");
3600 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3601 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3602 ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'");
3603
3604 // Pointers to current working set of containers
3605 JavaVMInitArgs* cur_cmd_args;
3606 JavaVMInitArgs* cur_vm_options_args;
3607 JavaVMInitArgs* cur_java_options_args;
3608 JavaVMInitArgs* cur_java_tool_options_args;
3609 JavaVMInitArgs* cur_jdk_aot_vm_options_args;
3610
3611 // Containers for modified/expanded options
3612 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3613 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3614 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3615 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3616 ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'");
3617
3618 GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args;
3619
3620 jint code =
3621 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3622 if (code != JNI_OK) {
3623 return code;
3624 }
3625
3626 // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM.
3627 // This is an undocumented feature.
3628 code = parse_java_options_environment_variable(&initial_java_options_args);
3629 if (code != JNI_OK) {
3630 return code;
3631 }
3632
3633 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3634 char *vmoptions = ClassLoader::lookup_vm_options();
3635 if (vmoptions != nullptr) {
3636 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3637 FREE_C_HEAP_ARRAY(char, vmoptions);
3638 if (code != JNI_OK) {
3639 return code;
3640 }
3641 }
3642
3643 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3644 &mod_java_tool_options_args,
3645 &cur_java_tool_options_args);
3646 if (code != JNI_OK) {
3647 return code;
3648 }
3649
3650 code = expand_vm_options_as_needed(initial_cmd_args,
3651 &mod_cmd_args,
3652 &cur_cmd_args);
3653 if (code != JNI_OK) {
3654 return code;
3655 }
3656
3657 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3658 &mod_java_options_args,
3659 &cur_java_options_args);
3660 if (code != JNI_OK) {
3661 return code;
3662 }
3663
3664 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3665 &mod_vm_options_args,
3666 &cur_vm_options_args);
3667 if (code != JNI_OK) {
3668 return code;
3669 }
3670
3671 const char* flags_file = Arguments::get_jvm_flags_file();
3672 settings_file_specified = (flags_file != nullptr);
3673
3674 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags.
3675 if (settings_file_specified) {
3676 if (!process_settings_file(flags_file, true,
3677 IgnoreUnrecognizedVMOptions)) {
3678 return JNI_EINVAL;
3679 }
3680 } else {
3681 #ifdef ASSERT
3682 // Parse default .hotspotrc settings file
3683 if (!process_settings_file(".hotspotrc", false,
3684 IgnoreUnrecognizedVMOptions)) {
3685 return JNI_EINVAL;
3686 }
3687 #else
3688 struct stat buf;
3689 if (os::stat(hotspotrc, &buf) == 0) {
3690 needs_hotspotrc_warning = true;
3691 }
3692 #endif
3693 }
3694
3695 // The settings in the args are applied in this order to the the JVM global flags.
3696 // For historical reasons, the order is DIFFERENT than the scanning order of
3697 // the above expand_vm_options_as_needed() calls.
3698 all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE});
3699 all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR});
3700 all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE});
3701 all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR});
3702
3703 // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all
3704 // the options that have been gathered above.
3705 code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args);
3706 if (code != JNI_OK) {
3707 return code;
3708 }
3709 code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(),
3710 &mod_jdk_aot_vm_options_args,
3711 &cur_jdk_aot_vm_options_args);
3712 if (code != JNI_OK) {
3713 return code;
3714 }
3715
3716 for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) {
3717 JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index;
3718 const char* optionString = option->optionString;
3719 if (strstr(optionString, "-XX:AOTMode=") == optionString &&
3720 strcmp(optionString, "-XX:AOTMode=create") != 0) {
3721 jio_fprintf(defaultStream::error_stream(),
3722 "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString);
3723 return JNI_ERR;
3724 }
3725 }
3726
3727 all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR});
3728
3729 if (IgnoreUnrecognizedVMOptions) {
3730 // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of
3731 // the JDK so it shouldn't have bad options.
3732 cur_cmd_args->ignoreUnrecognized = true;
3733 cur_java_tool_options_args->ignoreUnrecognized = true;
3734 cur_java_options_args->ignoreUnrecognized = true;
3735 cur_jdk_aot_vm_options_args->ignoreUnrecognized = true;
3736 }
3737
3738 if (PrintVMOptions) {
3739 // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed.
3740 print_options(cur_java_tool_options_args);
3741 print_options(cur_cmd_args);
3742 print_options(cur_java_options_args);
3743 print_options(cur_jdk_aot_vm_options_args);
3744 }
3745
3746 // Apply the settings in these args to the JVM global flags.
3747 jint result = parse_vm_init_args(&all_args);
3748
3749 if (result != JNI_OK) {
3750 return result;
3751 }
3752
3753 // Delay warning until here so that we've had a chance to process
3754 // the -XX:-PrintWarnings flag
3755 if (needs_hotspotrc_warning) {
3756 warning("%s file is present but has been ignored. "
3757 "Run with -XX:Flags=%s to load the file.",
3758 hotspotrc, hotspotrc);
3759 }
3760
3761 if (needs_module_property_warning) {
3762 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3763 " names that are reserved for internal use.");
3764 }
3765
3766 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3767 UNSUPPORTED_OPTION(UseLargePages);
3768 #endif
3769
3770 #if defined(AIX)
3771 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3772 #endif
3773
3774 #ifndef PRODUCT
3775 if (TraceBytecodesAt != 0) {
3776 TraceBytecodes = true;
3777 }
3778 #endif // PRODUCT
3779
3780 if (ScavengeRootsInCode == 0) {
3781 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3782 warning("Forcing ScavengeRootsInCode non-zero");
3783 }
3784 ScavengeRootsInCode = 1;
3785 }
3786
3787 if (!handle_deprecated_print_gc_flags()) {
3788 return JNI_EINVAL;
3789 }
3790
3791 // Set object alignment values.
3792 set_object_alignment();
3793
3794 #if !INCLUDE_CDS
3795 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3796 jio_fprintf(defaultStream::error_stream(),
3797 "Shared spaces are not supported in this VM\n");
3798 return JNI_ERR;
3799 }
3800 if (DumpLoadedClassList != nullptr) {
3801 jio_fprintf(defaultStream::error_stream(),
3802 "DumpLoadedClassList is not supported in this VM\n");
3803 return JNI_ERR;
3804 }
3805 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3806 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) {
3807 warning("Shared spaces are not supported in this VM");
3808 UseSharedSpaces = false;
3809 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3810 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot));
3811 }
3812 no_shared_spaces("CDS Disabled");
3813 #endif // INCLUDE_CDS
3814
3815 // Verify NMT arguments
3816 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3817 if (lvl == NMT_unknown) {
3818 jio_fprintf(defaultStream::error_stream(),
3819 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3820 return JNI_ERR;
3821 }
3822 if (PrintNMTStatistics && lvl == NMT_off) {
3823 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3824 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3825 }
3826
3827 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3828 if (trace_dependencies && VerifyDependencies) {
3829 warning("dependency logging results may be inflated by VerifyDependencies");
3830 }
3831
3832 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3833 log_is_enabled(Info, class, load, cause);
3834 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3835 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3836 }
3837
3838 apply_debugger_ergo();
3839
3840 // The VMThread needs to stop now and then to execute these debug options.
3841 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3842 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3843 }
3844
3845 if (log_is_enabled(Info, arguments)) {
3846 LogStream st(Log(arguments)::info());
3847 Arguments::print_on(&st);
3848 }
3849
3850 return JNI_OK;
3851 }
3852
3853 void Arguments::set_compact_headers_flags() {
3854 #ifdef _LP64
3855 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3856 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3857 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3858 }
3859 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3860 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3861 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3862 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3863
3864 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3865 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3866 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3867 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3868 } else {
3869 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3870 }
3871 }
3872 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3873 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3874 }
3875 #endif
3876 }
3877
3878 jint Arguments::apply_ergo() {
3879 // Set flags based on ergonomics.
3880 jint result = set_ergonomics_flags();
3881 if (result != JNI_OK) return result;
3882
3883 // Set heap size based on available physical memory
3884 set_heap_size();
3885
3886 GCConfig::arguments()->initialize();
3887
3888 set_compact_headers_flags();
3889
3890 if (UseCompressedClassPointers) {
3891 CompressedKlassPointers::pre_initialize();
3892 }
3893
3894 CDSConfig::ergo_initialize();
3895
3896 // Initialize Metaspace flags and alignments
3897 Metaspace::ergo_initialize();
3898
3899 if (!StringDedup::ergo_initialize()) {
3900 return JNI_EINVAL;
3901 }
3902
3903 // Set compiler flags after GC is selected and GC specific
3904 // flags (LoopStripMiningIter) are set.
3905 CompilerConfig::ergo_initialize();
3906
3907 // Set bytecode rewriting flags
3908 set_bytecode_flags();
3909
3910 // Set flags if aggressive optimization flags are enabled
3911 jint code = set_aggressive_opts_flags();
3912 if (code != JNI_OK) {
3913 return code;
3914 }
3915
3916 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3917 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3918 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3919 warning("UseSecondarySupersTable is not supported");
3920 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3921 }
3922 if (!UseSecondarySupersTable) {
3923 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3924 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3925 }
3926
3927 #ifdef ZERO
3928 // Clear flags not supported on zero.
3929 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3930 #endif // ZERO
3931
3932 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3933 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3934 DebugNonSafepoints = true;
3935 }
3936
3937 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3938 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3939 }
3940
3941 // Treat the odd case where local verification is enabled but remote
3942 // verification is not as if both were enabled.
3943 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3944 log_info(verification)("Turning on remote verification because local verification is on");
3945 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3946 }
3947 if (!EnableValhalla || (is_interpreter_only() && !CDSConfig::is_dumping_archive() && !UseSharedSpaces)) {
3948 // Disable calling convention optimizations if inline types are not supported.
3949 // Also these aren't useful in -Xint. However, don't disable them when dumping or using
3950 // the CDS archive, as the values must match between dumptime and runtime.
3951 FLAG_SET_DEFAULT(InlineTypePassFieldsAsArgs, false);
3952 FLAG_SET_DEFAULT(InlineTypeReturnedAsFields, false);
3953 }
3954 if (!UseNonAtomicValueFlattening && !UseNullableValueFlattening && !UseAtomicValueFlattening) {
3955 // Flattening is disabled
3956 FLAG_SET_DEFAULT(UseArrayFlattening, false);
3957 FLAG_SET_DEFAULT(UseFieldFlattening, false);
3958 }
3959
3960 #ifndef PRODUCT
3961 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3962 if (use_vm_log()) {
3963 LogVMOutput = true;
3964 }
3965 }
3966 #endif // PRODUCT
3967
3968 if (PrintCommandLineFlags) {
3969 JVMFlag::printSetFlags(tty);
3970 }
3971
3972 #if COMPILER2_OR_JVMCI
3973 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3974 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3975 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3976 }
3977 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3978
3979 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3980 if (!EnableVectorReboxing) {
3981 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3982 } else {
3983 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3984 }
3985 }
3986 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3987 }
3988 #endif // COMPILER2_OR_JVMCI
3989
3990 #ifdef COMPILER2
3991 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
3992 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
3993 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
3994 }
3995 #endif // COMPILER2
3996
3997 if (log_is_enabled(Info, perf, class, link)) {
3998 if (!UsePerfData) {
3999 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
4000 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
4001 assert(!log_is_enabled(Info, perf, class, link), "sanity");
4002 }
4003 }
4004
4005 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
4006 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
4007 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
4008 }
4009 }
4010 return JNI_OK;
4011 }
4012
4013 jint Arguments::adjust_after_os() {
4014 if (UseNUMA) {
4015 if (UseParallelGC) {
4016 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4017 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4018 }
4019 }
4020 }
4021 return JNI_OK;
4022 }
4023
4024 int Arguments::PropertyList_count(SystemProperty* pl) {
4025 int count = 0;
4026 while(pl != nullptr) {
4027 count++;
4028 pl = pl->next();
4029 }
4030 return count;
4031 }
4032
4033 // Return the number of readable properties.
4034 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4035 int count = 0;
4036 while(pl != nullptr) {
4037 if (pl->readable()) {
4038 count++;
4039 }
4040 pl = pl->next();
4041 }
4042 return count;
4043 }
4044
4045 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4046 assert(key != nullptr, "just checking");
4047 SystemProperty* prop;
4048 for (prop = pl; prop != nullptr; prop = prop->next()) {
4049 if (strcmp(key, prop->key()) == 0) return prop->value();
4050 }
4051 return nullptr;
4052 }
4053
4054 // Return the value of the requested property provided that it is a readable property.
4055 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4056 assert(key != nullptr, "just checking");
4057 SystemProperty* prop;
4058 // Return the property value if the keys match and the property is not internal or
4059 // it's the special internal property "jdk.boot.class.path.append".
4060 for (prop = pl; prop != nullptr; prop = prop->next()) {
4061 if (strcmp(key, prop->key()) == 0) {
4062 if (!prop->internal()) {
4063 return prop->value();
4064 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4065 return prop->value();
4066 } else {
4067 // Property is internal and not jdk.boot.class.path.append so return null.
4068 return nullptr;
4069 }
4070 }
4071 }
4072 return nullptr;
4073 }
4074
4075 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4076 SystemProperty* p = *plist;
4077 if (p == nullptr) {
4078 *plist = new_p;
4079 } else {
4080 while (p->next() != nullptr) {
4081 p = p->next();
4082 }
4083 p->set_next(new_p);
4084 }
4085 }
4086
4087 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4088 bool writeable, bool internal) {
4089 if (plist == nullptr)
4090 return;
4091
4092 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4093 PropertyList_add(plist, new_p);
4094 }
4095
4096 void Arguments::PropertyList_add(SystemProperty *element) {
4097 PropertyList_add(&_system_properties, element);
4098 }
4099
4100 // This add maintains unique property key in the list.
4101 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4102 PropertyAppendable append, PropertyWriteable writeable,
4103 PropertyInternal internal) {
4104 if (plist == nullptr)
4105 return;
4106
4107 // If property key exists and is writeable, then update with new value.
4108 // Trying to update a non-writeable property is silently ignored.
4109 SystemProperty* prop;
4110 for (prop = *plist; prop != nullptr; prop = prop->next()) {
4111 if (strcmp(k, prop->key()) == 0) {
4112 if (append == AppendProperty) {
4113 prop->append_writeable_value(v);
4114 } else {
4115 prop->set_writeable_value(v);
4116 }
4117 return;
4118 }
4119 }
4120
4121 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4122 }
4123
4124 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4125 // Returns true if all of the source pointed by src has been copied over to
4126 // the destination buffer pointed by buf. Otherwise, returns false.
4127 // Notes:
4128 // 1. If the length (buflen) of the destination buffer excluding the
4129 // null terminator character is not long enough for holding the expanded
4130 // pid characters, it also returns false instead of returning the partially
4131 // expanded one.
4132 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4133 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4134 char* buf, size_t buflen) {
4135 const char* p = src;
4136 char* b = buf;
4137 const char* src_end = &src[srclen];
4138 char* buf_end = &buf[buflen - 1];
4139
4140 while (p < src_end && b < buf_end) {
4141 if (*p == '%') {
4142 switch (*(++p)) {
4143 case '%': // "%%" ==> "%"
4144 *b++ = *p++;
4145 break;
4146 case 'p': { // "%p" ==> current process id
4147 // buf_end points to the character before the last character so
4148 // that we could write '\0' to the end of the buffer.
4149 size_t buf_sz = buf_end - b + 1;
4150 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4151
4152 // if jio_snprintf fails or the buffer is not long enough to hold
4153 // the expanded pid, returns false.
4154 if (ret < 0 || ret >= (int)buf_sz) {
4155 return false;
4156 } else {
4157 b += ret;
4158 assert(*b == '\0', "fail in copy_expand_pid");
4159 if (p == src_end && b == buf_end + 1) {
4160 // reach the end of the buffer.
4161 return true;
4162 }
4163 }
4164 p++;
4165 break;
4166 }
4167 default :
4168 *b++ = '%';
4169 }
4170 } else {
4171 *b++ = *p++;
4172 }
4173 }
4174 *b = '\0';
4175 return (p == src_end); // return false if not all of the source was copied
4176 }