1 /*
2 * Copyright (c) 1997, 2024, 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 "precompiled.hpp"
26 #include "cds/cds_globals.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/filemap.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/javaAssertions.hpp"
31 #include "classfile/moduleEntry.hpp"
32 #include "classfile/stringTable.hpp"
33 #include "classfile/symbolTable.hpp"
34 #include "compiler/compilerDefinitions.hpp"
35 #include "gc/shared/gcArguments.hpp"
36 #include "gc/shared/gcConfig.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/oop.inline.hpp"
49 #include "prims/jvmtiAgentList.hpp"
50 #include "prims/jvmtiExport.hpp"
51 #include "runtime/arguments.hpp"
52 #include "runtime/flags/jvmFlag.hpp"
53 #include "runtime/flags/jvmFlagAccess.hpp"
54 #include "runtime/flags/jvmFlagLimit.hpp"
55 #include "runtime/globals_extension.hpp"
56 #include "runtime/java.hpp"
57 #include "runtime/os.hpp"
58 #include "runtime/safepoint.hpp"
59 #include "runtime/safepointMechanism.hpp"
60 #include "runtime/synchronizer.hpp"
61 #include "runtime/vm_version.hpp"
62 #include "services/management.hpp"
63 #include "utilities/align.hpp"
64 #include "utilities/checkedCast.hpp"
65 #include "utilities/debug.hpp"
66 #include "utilities/defaultStream.hpp"
67 #include "utilities/macros.hpp"
68 #include "utilities/parseInteger.hpp"
69 #include "utilities/powerOfTwo.hpp"
70 #include "utilities/stringUtils.hpp"
71 #include "utilities/systemMemoryBarrier.hpp"
72 #if INCLUDE_JFR
73 #include "jfr/jfr.hpp"
74 #endif
75
76 #include <limits>
77 #include <string.h>
78
79 static const char _default_java_launcher[] = "generic";
80
81 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
82
83 char* Arguments::_jvm_flags_file = nullptr;
84 char** Arguments::_jvm_flags_array = nullptr;
85 int Arguments::_num_jvm_flags = 0;
86 char** Arguments::_jvm_args_array = nullptr;
87 int Arguments::_num_jvm_args = 0;
88 char* Arguments::_java_command = nullptr;
89 SystemProperty* Arguments::_system_properties = nullptr;
90 size_t Arguments::_conservative_max_heap_alignment = 0;
91 Arguments::Mode Arguments::_mode = _mixed;
92 const char* Arguments::_java_vendor_url_bug = nullptr;
93 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
94 bool Arguments::_sun_java_launcher_is_altjvm = false;
95
96 // These parameters are reset in method parse_vm_init_args()
97 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
98 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
99 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
100 bool Arguments::_ClipInlining = ClipInlining;
101 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
102
103 bool Arguments::_enable_preview = false;
104
105 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 };
106
107 // These are not set by the JDK's built-in launchers, but they can be set by
108 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
109 // JavaVMOption in jni.h.
110 abort_hook_t Arguments::_abort_hook = nullptr;
111 exit_hook_t Arguments::_exit_hook = nullptr;
112 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
113
114
115 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
116 SystemProperty *Arguments::_java_library_path = nullptr;
117 SystemProperty *Arguments::_java_home = nullptr;
118 SystemProperty *Arguments::_java_class_path = nullptr;
119 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
120 SystemProperty *Arguments::_vm_info = nullptr;
121
122 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
123 PathString *Arguments::_boot_class_path = nullptr;
124 bool Arguments::_has_jimage = false;
125
126 char* Arguments::_ext_dirs = nullptr;
127
128 // True if -Xshare:auto option was specified.
129 static bool xshare_auto_cmd_line = false;
130
131 // True if -Xint/-Xmixed/-Xcomp were specified
132 static bool mode_flag_cmd_line = false;
133
134 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
135 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
136 if (new_value == nullptr) {
137 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
138 return false;
139 }
140 if (_value != nullptr) {
141 FreeHeap(_value);
142 }
143 _value = new_value;
144 strcpy(_value, value);
145 return true;
146 }
147
148 void PathString::append_value(const char *value) {
149 char *sp;
150 size_t len = 0;
151 if (value != nullptr) {
152 len = strlen(value);
153 if (_value != nullptr) {
154 len += strlen(_value);
155 }
156 sp = AllocateHeap(len+2, mtArguments);
157 assert(sp != nullptr, "Unable to allocate space for new append path value");
158 if (sp != nullptr) {
159 if (_value != nullptr) {
160 strcpy(sp, _value);
161 strcat(sp, os::path_separator());
162 strcat(sp, value);
163 FreeHeap(_value);
164 } else {
165 strcpy(sp, value);
166 }
167 _value = sp;
168 }
169 }
170 }
171
172 PathString::PathString(const char* value) {
173 if (value == nullptr) {
174 _value = nullptr;
175 } else {
176 _value = AllocateHeap(strlen(value)+1, mtArguments);
177 strcpy(_value, value);
178 }
179 }
180
181 PathString::~PathString() {
182 if (_value != nullptr) {
183 FreeHeap(_value);
184 _value = nullptr;
185 }
186 }
187
188 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
189 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
190 size_t len = strlen(module_name) + 1;
191 _module_name = AllocateHeap(len, mtInternal);
192 strncpy(_module_name, module_name, len); // copy the trailing null
193 _path = new PathString(path);
194 }
195
196 ModulePatchPath::~ModulePatchPath() {
197 if (_module_name != nullptr) {
198 FreeHeap(_module_name);
199 _module_name = nullptr;
200 }
201 if (_path != nullptr) {
202 delete _path;
203 _path = nullptr;
204 }
205 }
206
207 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
208 if (key == nullptr) {
209 _key = nullptr;
210 } else {
211 _key = AllocateHeap(strlen(key)+1, mtArguments);
212 strcpy(_key, key);
213 }
214 _next = nullptr;
215 _internal = internal;
216 _writeable = writeable;
217 }
218
219 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
220 // part of the option string.
221 static bool match_option(const JavaVMOption *option, const char* name,
222 const char** tail) {
223 size_t len = strlen(name);
224 if (strncmp(option->optionString, name, len) == 0) {
225 *tail = option->optionString + len;
226 return true;
227 } else {
228 return false;
229 }
230 }
231
232 // Check if 'option' matches 'name'. No "tail" is allowed.
233 static bool match_option(const JavaVMOption *option, const char* name) {
234 const char* tail = nullptr;
235 bool result = match_option(option, name, &tail);
236 if (tail != nullptr && *tail == '\0') {
237 return result;
238 } else {
239 return false;
240 }
241 }
242
243 // Return true if any of the strings in null-terminated array 'names' matches.
244 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
245 // the option must match exactly.
246 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
247 bool tail_allowed) {
248 for (/* empty */; *names != nullptr; ++names) {
249 if (match_option(option, *names, tail)) {
250 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
251 return true;
252 }
253 }
254 }
255 return false;
256 }
257
258 #if INCLUDE_JFR
259 static bool _has_jfr_option = false; // is using JFR
260
261 // return true on failure
262 static bool match_jfr_option(const JavaVMOption** option) {
263 assert((*option)->optionString != nullptr, "invariant");
264 char* tail = nullptr;
265 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
266 _has_jfr_option = true;
267 return Jfr::on_start_flight_recording_option(option, tail);
268 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
269 _has_jfr_option = true;
270 return Jfr::on_flight_recorder_option(option, tail);
271 }
272 return false;
273 }
274
275 bool Arguments::has_jfr_option() {
276 return _has_jfr_option;
277 }
278 #endif
279
280 static void logOption(const char* opt) {
281 if (PrintVMOptions) {
282 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
283 }
284 }
285
286 bool needs_module_property_warning = false;
287
288 #define MODULE_PROPERTY_PREFIX "jdk.module."
289 #define MODULE_PROPERTY_PREFIX_LEN 11
290 #define ADDEXPORTS "addexports"
291 #define ADDEXPORTS_LEN 10
292 #define ADDREADS "addreads"
293 #define ADDREADS_LEN 8
294 #define ADDOPENS "addopens"
295 #define ADDOPENS_LEN 8
296 #define PATCH "patch"
297 #define PATCH_LEN 5
298 #define ADDMODS "addmods"
299 #define ADDMODS_LEN 7
300 #define LIMITMODS "limitmods"
301 #define LIMITMODS_LEN 9
302 #define PATH "path"
303 #define PATH_LEN 4
304 #define UPGRADE_PATH "upgrade.path"
305 #define UPGRADE_PATH_LEN 12
306 #define ENABLE_NATIVE_ACCESS "enable.native.access"
307 #define ENABLE_NATIVE_ACCESS_LEN 20
308
309 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
310 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
311 return ((strncmp(option, property, len) == 0) &&
312 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
313 }
314
315 // Return true if property starts with "jdk.module." and its ensuing chars match
316 // any of the reserved module properties.
317 // property should be passed without the leading "-D".
318 bool Arguments::is_internal_module_property(const char* property) {
319 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
320 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
321 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
322 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
323 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
324 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
325 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
326 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
327 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
328 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
329 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
330 return true;
331 }
332 }
333 return false;
334 }
335
336 // Process java launcher properties.
337 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
338 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
339 // Must do this before setting up other system properties,
340 // as some of them may depend on launcher type.
341 for (int index = 0; index < args->nOptions; index++) {
342 const JavaVMOption* option = args->options + index;
343 const char* tail;
344
345 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
346 process_java_launcher_argument(tail, option->extraInfo);
347 continue;
348 }
349 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
350 if (strcmp(tail, "true") == 0) {
351 _sun_java_launcher_is_altjvm = true;
352 }
353 continue;
354 }
355 }
356 }
357
358 // Initialize system properties key and value.
359 void Arguments::init_system_properties() {
360
361 // Set up _boot_class_path which is not a property but
362 // relies heavily on argument processing and the jdk.boot.class.path.append
363 // property. It is used to store the underlying boot class path.
364 _boot_class_path = new PathString(nullptr);
365
366 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
367 "Java Virtual Machine Specification", false));
368 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
369 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
370 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
371
372 // Initialize the vm.info now, but it will need updating after argument parsing.
373 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
374
375 // Following are JVMTI agent writable properties.
376 // Properties values are set to nullptr and they are
377 // os specific they are initialized in os::init_system_properties_values().
378 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
379 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
380 _java_home = new SystemProperty("java.home", nullptr, true);
381 _java_class_path = new SystemProperty("java.class.path", "", true);
382 // jdk.boot.class.path.append is a non-writeable, internal property.
383 // It can only be set by either:
384 // - -Xbootclasspath/a:
385 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
386 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
387
388 // Add to System Property list.
389 PropertyList_add(&_system_properties, _sun_boot_library_path);
390 PropertyList_add(&_system_properties, _java_library_path);
391 PropertyList_add(&_system_properties, _java_home);
392 PropertyList_add(&_system_properties, _java_class_path);
393 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
394 PropertyList_add(&_system_properties, _vm_info);
395
396 // Set OS specific system properties values
397 os::init_system_properties_values();
398 }
399
400 // Update/Initialize System properties after JDK version number is known
401 void Arguments::init_version_specific_system_properties() {
402 enum { bufsz = 16 };
403 char buffer[bufsz];
404 const char* spec_vendor = "Oracle Corporation";
405 uint32_t spec_version = JDK_Version::current().major_version();
406
407 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
408
409 PropertyList_add(&_system_properties,
410 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
411 PropertyList_add(&_system_properties,
412 new SystemProperty("java.vm.specification.version", buffer, false));
413 PropertyList_add(&_system_properties,
414 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
415 }
416
417 /*
418 * -XX argument processing:
419 *
420 * -XX arguments are defined in several places, such as:
421 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
422 * -XX arguments are parsed in parse_argument().
423 * -XX argument bounds checking is done in check_vm_args_consistency().
424 *
425 * Over time -XX arguments may change. There are mechanisms to handle common cases:
426 *
427 * ALIASED: An option that is simply another name for another option. This is often
428 * part of the process of deprecating a flag, but not all aliases need
429 * to be deprecated.
430 *
431 * Create an alias for an option by adding the old and new option names to the
432 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
433 *
434 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
435 * support may be removed in the future. Both regular and aliased options may be
436 * deprecated.
437 *
438 * Add a deprecation warning for an option (or alias) by adding an entry in the
439 * "special_jvm_flags" table and setting the "deprecated_in" field.
440 * Often an option "deprecated" in one major release will
441 * be made "obsolete" in the next. In this case the entry should also have its
442 * "obsolete_in" field set.
443 *
444 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
445 * on the command line. A warning is printed to let the user know that option might not
446 * be accepted in the future.
447 *
448 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
449 * table and setting the "obsolete_in" field.
450 *
451 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
452 * to the current JDK version. The system will flatly refuse to admit the existence of
453 * the flag. This allows a flag to die automatically over JDK releases.
454 *
455 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
456 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
457 * - Newly obsolete or expired deprecated options should have their global variable
458 * definitions removed (from globals.hpp, etc) and related implementations removed.
459 *
460 * Recommended approach for removing options:
461 *
462 * To remove options commonly used by customers (e.g. product -XX options), use
463 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
464 *
465 * To remove internal options (e.g. diagnostic, experimental, develop options), use
466 * a 2-step model adding major release numbers to the obsolete and expire columns.
467 *
468 * To change the name of an option, use the alias table as well as a 2-step
469 * model adding major release numbers to the deprecate and expire columns.
470 * Think twice about aliasing commonly used customer options.
471 *
472 * There are times when it is appropriate to leave a future release number as undefined.
473 *
474 * Tests: Aliases should be tested in VMAliasOptions.java.
475 * Deprecated options should be tested in VMDeprecatedOptions.java.
476 */
477
478 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
479 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
480 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
481 // the command-line as usual, but will issue a warning.
482 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
483 // the command-line, while issuing a warning and ignoring the flag value.
484 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
485 // existence of the flag.
486 //
487 // MANUAL CLEANUP ON JDK VERSION UPDATES:
488 // This table ensures that the handling of options will update automatically when the JDK
489 // version is incremented, but the source code needs to be cleanup up manually:
490 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
491 // variable should be removed, as well as users of the variable.
492 // - As "deprecated" options age into "obsolete" options, move the entry into the
493 // "Obsolete Flags" section of the table.
494 // - All expired options should be removed from the table.
495 static SpecialFlag const special_jvm_flags[] = {
496 // -------------- Deprecated Flags --------------
497 // --- Non-alias flags - sorted by obsolete_in then expired_in:
498 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
499 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
500 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::undefined(), JDK_Version::undefined() },
501 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
502 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
503 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
504 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
505 { "RegisterFinalizersAtInit", JDK_Version::jdk(22), JDK_Version::jdk(23), JDK_Version::jdk(24) },
506 { "DontYieldALot", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
507 { "OldSize", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
508 { "PreserveAllAnnotations", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
509 { "UseNotificationThread", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
510 { "UseEmptySlotsInSupers", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
511 #if defined(X86)
512 { "UseRTMLocking", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
513 { "UseRTMDeopt", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
514 { "RTMRetryCount", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
515 #endif // X86
516 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
517 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
518
519 // -------------- Obsolete Flags - sorted by expired_in --------------
520
521 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
522
523 { "G1ConcRefinementGreenZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) },
524 { "G1ConcRefinementYellowZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) },
525 { "G1ConcRefinementRedZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) },
526 { "G1ConcRefinementThresholdStep", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) },
527 { "G1UseAdaptiveConcRefinement", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) },
528 { "G1ConcRefinementServiceIntervalMillis", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) },
529
530 { "G1ConcRSLogCacheSize", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::jdk(24) },
531 { "G1ConcRSHotCardLimit", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::jdk(24) },
532 { "RefDiscoveryPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::jdk(24) },
533
534 { "AdaptiveSizePolicyCollectionCostMargin", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
535 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::jdk(23), JDK_Version::jdk(24) },
536 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::jdk(23), JDK_Version::jdk(24) },
537 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::jdk(23), JDK_Version::jdk(24) },
538 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::jdk(23), JDK_Version::jdk(24) },
539 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::jdk(23), JDK_Version::jdk(24) },
540 { "TLABStats", JDK_Version::jdk(12), JDK_Version::jdk(23), JDK_Version::jdk(24) },
541 { "GCLockerEdenExpansionPercent", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
542 { "NUMAPageScanRate", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
543 { "ProcessDistributionStride", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
544
545 { "ParallelOldDeadWoodLimiterMean", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
546 { "ParallelOldDeadWoodLimiterStdDev", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
547 { "UseNeon", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
548 { "ScavengeBeforeFullGC", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
549 #ifdef ASSERT
550 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
551 #endif
552
553 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
554 // These entries will generate build errors. Their purpose is to test the macros.
555 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
556 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
557 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
558 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
559 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
560 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
561 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
562 #endif
563
564 { nullptr, JDK_Version(0), JDK_Version(0) }
565 };
566
567 // Flags that are aliases for other flags.
568 typedef struct {
569 const char* alias_name;
570 const char* real_name;
571 } AliasedFlag;
572
573 static AliasedFlag const aliased_jvm_flags[] = {
574 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
575 { nullptr, nullptr}
576 };
577
578 // Return true if "v" is less than "other", where "other" may be "undefined".
579 static bool version_less_than(JDK_Version v, JDK_Version other) {
580 assert(!v.is_undefined(), "must be defined");
581 if (!other.is_undefined() && v.compare(other) >= 0) {
582 return false;
583 } else {
584 return true;
585 }
586 }
587
588 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
589 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
590 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
591 flag = special_jvm_flags[i];
592 return true;
593 }
594 }
595 return false;
596 }
597
598 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
599 assert(version != nullptr, "Must provide a version buffer");
600 SpecialFlag flag;
601 if (lookup_special_flag(flag_name, flag)) {
602 if (!flag.obsolete_in.is_undefined()) {
603 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
604 *version = flag.obsolete_in;
605 // This flag may have been marked for obsoletion in this version, but we may not
606 // have actually removed it yet. Rather than ignoring it as soon as we reach
607 // this version we allow some time for the removal to happen. So if the flag
608 // still actually exists we process it as normal, but issue an adjusted warning.
609 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
610 if (real_flag != nullptr) {
611 char version_str[256];
612 version->to_string(version_str, sizeof(version_str));
613 warning("Temporarily processing option %s; support is scheduled for removal in %s",
614 flag_name, version_str);
615 return false;
616 }
617 return true;
618 }
619 }
620 }
621 return false;
622 }
623
624 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
625 assert(version != nullptr, "Must provide a version buffer");
626 SpecialFlag flag;
627 if (lookup_special_flag(flag_name, flag)) {
628 if (!flag.deprecated_in.is_undefined()) {
629 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
630 version_less_than(JDK_Version::current(), flag.expired_in)) {
631 *version = flag.deprecated_in;
632 return 1;
633 } else {
634 return -1;
635 }
636 }
637 }
638 return 0;
639 }
640
641 const char* Arguments::real_flag_name(const char *flag_name) {
642 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
643 const AliasedFlag& flag_status = aliased_jvm_flags[i];
644 if (strcmp(flag_status.alias_name, flag_name) == 0) {
645 return flag_status.real_name;
646 }
647 }
648 return flag_name;
649 }
650
651 #ifdef ASSERT
652 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
653 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
654 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
655 return true;
656 }
657 }
658 return false;
659 }
660
661 // Verifies the correctness of the entries in the special_jvm_flags table.
662 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
663 // version being earlier than the deprecation version, then a warning is issued
664 // and verification fails - by returning false. If it is detected that the table
665 // is out of date, with respect to the current version, then ideally a warning is
666 // issued but verification does not fail. This allows the VM to operate when the
667 // version is first updated, without needing to update all the impacted flags at
668 // the same time. In practice we can't issue the warning immediately when the version
669 // is updated as it occurs for every test and some tests are not prepared to handle
670 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
671 // if the check_globals flag is true, and in addition allow a grace period and only
672 // check for stale flags when we hit build 25 (which is far enough into the 6 month
673 // release cycle that all flag updates should have been processed, whilst still
674 // leaving time to make the change before RDP2).
675 // We use a gtest to call this, passing true, so that we can detect stale flags before
676 // the end of the release cycle.
677
678 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
679
680 bool Arguments::verify_special_jvm_flags(bool check_globals) {
681 bool success = true;
682 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
683 const SpecialFlag& flag = special_jvm_flags[i];
684 if (lookup_special_flag(flag.name, i)) {
685 warning("Duplicate special flag declaration \"%s\"", flag.name);
686 success = false;
687 }
688 if (flag.deprecated_in.is_undefined() &&
689 flag.obsolete_in.is_undefined()) {
690 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
691 success = false;
692 }
693
694 if (!flag.deprecated_in.is_undefined()) {
695 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
696 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
697 success = false;
698 }
699
700 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
701 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
702 success = false;
703 }
704 }
705
706 if (!flag.obsolete_in.is_undefined()) {
707 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
708 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
709 success = false;
710 }
711
712 // if flag has become obsolete it should not have a "globals" flag defined anymore.
713 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
714 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
715 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
716 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
717 success = false;
718 }
719 }
720
721 } else if (!flag.expired_in.is_undefined()) {
722 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
723 success = false;
724 }
725
726 if (!flag.expired_in.is_undefined()) {
727 // if flag has become expired it should not have a "globals" flag defined anymore.
728 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
729 !version_less_than(JDK_Version::current(), flag.expired_in)) {
730 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
731 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
732 success = false;
733 }
734 }
735 }
736 }
737 return success;
738 }
739 #endif
740
741 bool Arguments::atojulong(const char *s, julong* result) {
742 return parse_integer(s, result);
743 }
744
745 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
746 if (size < min_size) return arg_too_small;
747 if (size > max_size) return arg_too_big;
748 return arg_in_range;
749 }
750
751 // Describe an argument out of range error
752 void Arguments::describe_range_error(ArgsRange errcode) {
753 switch(errcode) {
754 case arg_too_big:
755 jio_fprintf(defaultStream::error_stream(),
756 "The specified size exceeds the maximum "
757 "representable size.\n");
758 break;
759 case arg_too_small:
760 case arg_unreadable:
761 case arg_in_range:
762 // do nothing for now
763 break;
764 default:
765 ShouldNotReachHere();
766 }
767 }
768
769 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
770 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
771 return true;
772 } else {
773 return false;
774 }
775 }
776
777 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
778 // strtod allows leading whitespace, but our flag format does not.
779 if (*value == '\0' || isspace(*value)) {
780 return false;
781 }
782 char* end;
783 errno = 0;
784 double v = strtod(value, &end);
785 if ((errno != 0) || (*end != 0)) {
786 return false;
787 }
788 if (g_isnan(v) || !g_isfinite(v)) {
789 // Currently we cannot handle these special values.
790 return false;
791 }
792
793 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
794 return true;
795 }
796 return false;
797 }
798
799 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
800 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
801
802 if (flag->is_int()) {
803 int v;
804 if (parse_integer(value, &v)) {
805 result = JVMFlagAccess::set_int(flag, &v, origin);
806 }
807 } else if (flag->is_uint()) {
808 uint v;
809 if (parse_integer(value, &v)) {
810 result = JVMFlagAccess::set_uint(flag, &v, origin);
811 }
812 } else if (flag->is_intx()) {
813 intx v;
814 if (parse_integer(value, &v)) {
815 result = JVMFlagAccess::set_intx(flag, &v, origin);
816 }
817 } else if (flag->is_uintx()) {
818 uintx v;
819 if (parse_integer(value, &v)) {
820 result = JVMFlagAccess::set_uintx(flag, &v, origin);
821 }
822 } else if (flag->is_uint64_t()) {
823 uint64_t v;
824 if (parse_integer(value, &v)) {
825 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
826 }
827 } else if (flag->is_size_t()) {
828 size_t v;
829 if (parse_integer(value, &v)) {
830 result = JVMFlagAccess::set_size_t(flag, &v, origin);
831 }
832 }
833
834 return result == JVMFlag::SUCCESS;
835 }
836
837 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
838 if (value[0] == '\0') {
839 value = nullptr;
840 }
841 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
842 // Contract: JVMFlag always returns a pointer that needs freeing.
843 FREE_C_HEAP_ARRAY(char, value);
844 return true;
845 }
846
847 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
848 const char* old_value = "";
849 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
850 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
851 size_t new_len = strlen(new_value);
852 const char* value;
853 char* free_this_too = nullptr;
854 if (old_len == 0) {
855 value = new_value;
856 } else if (new_len == 0) {
857 value = old_value;
858 } else {
859 size_t length = old_len + 1 + new_len + 1;
860 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
861 // each new setting adds another LINE to the switch:
862 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
863 value = buf;
864 free_this_too = buf;
865 }
866 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
867 // JVMFlag always returns a pointer that needs freeing.
868 FREE_C_HEAP_ARRAY(char, value);
869 // JVMFlag made its own copy, so I must delete my own temp. buffer.
870 FREE_C_HEAP_ARRAY(char, free_this_too);
871 return true;
872 }
873
874 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
875 const char* real_name = real_flag_name(arg);
876 JDK_Version since = JDK_Version();
877 switch (is_deprecated_flag(arg, &since)) {
878 case -1: {
879 // Obsolete or expired, so don't process normally,
880 // but allow for an obsolete flag we're still
881 // temporarily allowing.
882 if (!is_obsolete_flag(arg, &since)) {
883 return real_name;
884 }
885 // Note if we're not considered obsolete then we can't be expired either
886 // as obsoletion must come first.
887 return nullptr;
888 }
889 case 0:
890 return real_name;
891 case 1: {
892 char version[256];
893 since.to_string(version, sizeof(version));
894 if (real_name != arg) {
895 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
896 arg, version, real_name);
897 } else {
898 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
899 arg, version);
900 }
901 return real_name;
902 }
903 }
904 ShouldNotReachHere();
905 return nullptr;
906 }
907
908 #define BUFLEN 255
909
910 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
911 char name_copied[BUFLEN+1];
912 if (name[name_length] != 0) {
913 if (name_length > BUFLEN) {
914 return nullptr;
915 } else {
916 strncpy(name_copied, name, name_length);
917 name_copied[name_length] = '\0';
918 name = name_copied;
919 }
920 }
921
922 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
923 if (real_name == nullptr) {
924 return nullptr;
925 }
926 JVMFlag* flag = JVMFlag::find_flag(real_name);
927 return flag;
928 }
929
930 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
931 bool is_bool = false;
932 bool bool_val = false;
933 char c = *arg;
934 if (c == '+' || c == '-') {
935 is_bool = true;
936 bool_val = (c == '+');
937 arg++;
938 }
939
940 const char* name = arg;
941 while (true) {
942 c = *arg;
943 if (isalnum(c) || (c == '_')) {
944 ++arg;
945 } else {
946 break;
947 }
948 }
949
950 size_t name_len = size_t(arg - name);
951 if (name_len == 0) {
952 return false;
953 }
954
955 JVMFlag* flag = find_jvm_flag(name, name_len);
956 if (flag == nullptr) {
957 return false;
958 }
959
960 if (is_bool) {
961 if (*arg != 0) {
962 // Error -- extra characters such as -XX:+BoolFlag=123
963 return false;
964 }
965 return set_bool_flag(flag, bool_val, origin);
966 }
967
968 if (arg[0] == '=') {
969 const char* value = arg + 1;
970 if (flag->is_ccstr()) {
971 if (flag->ccstr_accumulates()) {
972 return append_to_string_flag(flag, value, origin);
973 } else {
974 return set_string_flag(flag, value, origin);
975 }
976 } else if (flag->is_double()) {
977 return set_fp_numeric_flag(flag, value, origin);
978 } else {
979 return set_numeric_flag(flag, value, origin);
980 }
981 }
982
983 if (arg[0] == ':' && arg[1] == '=') {
984 // -XX:Foo:=xxx will reset the string flag to the given value.
985 const char* value = arg + 2;
986 return set_string_flag(flag, value, origin);
987 }
988
989 return false;
990 }
991
992 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
993 assert(bldarray != nullptr, "illegal argument");
994
995 if (arg == nullptr) {
996 return;
997 }
998
999 int new_count = *count + 1;
1000
1001 // expand the array and add arg to the last element
1002 if (*bldarray == nullptr) {
1003 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1004 } else {
1005 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1006 }
1007 (*bldarray)[*count] = os::strdup_check_oom(arg);
1008 *count = new_count;
1009 }
1010
1011 void Arguments::build_jvm_args(const char* arg) {
1012 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1013 }
1014
1015 void Arguments::build_jvm_flags(const char* arg) {
1016 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1017 }
1018
1019 // utility function to return a string that concatenates all
1020 // strings in a given char** array
1021 const char* Arguments::build_resource_string(char** args, int count) {
1022 if (args == nullptr || count == 0) {
1023 return nullptr;
1024 }
1025 size_t length = 0;
1026 for (int i = 0; i < count; i++) {
1027 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1028 }
1029 char* s = NEW_RESOURCE_ARRAY(char, length);
1030 char* dst = s;
1031 for (int j = 0; j < count; j++) {
1032 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1033 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1034 dst += offset;
1035 length -= offset;
1036 }
1037 return (const char*) s;
1038 }
1039
1040 void Arguments::print_on(outputStream* st) {
1041 st->print_cr("VM Arguments:");
1042 if (num_jvm_flags() > 0) {
1043 st->print("jvm_flags: "); print_jvm_flags_on(st);
1044 st->cr();
1045 }
1046 if (num_jvm_args() > 0) {
1047 st->print("jvm_args: "); print_jvm_args_on(st);
1048 st->cr();
1049 }
1050 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1051 if (_java_class_path != nullptr) {
1052 char* path = _java_class_path->value();
1053 size_t len = strlen(path);
1054 st->print("java_class_path (initial): ");
1055 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1056 if (len == 0) {
1057 st->print_raw_cr("<not set>");
1058 } else {
1059 st->print_raw_cr(path, len);
1060 }
1061 }
1062 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1063 }
1064
1065 void Arguments::print_summary_on(outputStream* st) {
1066 // Print the command line. Environment variables that are helpful for
1067 // reproducing the problem are written later in the hs_err file.
1068 // flags are from setting file
1069 if (num_jvm_flags() > 0) {
1070 st->print_raw("Settings File: ");
1071 print_jvm_flags_on(st);
1072 st->cr();
1073 }
1074 // args are the command line and environment variable arguments.
1075 st->print_raw("Command Line: ");
1076 if (num_jvm_args() > 0) {
1077 print_jvm_args_on(st);
1078 }
1079 // this is the classfile and any arguments to the java program
1080 if (java_command() != nullptr) {
1081 st->print("%s", java_command());
1082 }
1083 st->cr();
1084 }
1085
1086 void Arguments::print_jvm_flags_on(outputStream* st) {
1087 if (_num_jvm_flags > 0) {
1088 for (int i=0; i < _num_jvm_flags; i++) {
1089 st->print("%s ", _jvm_flags_array[i]);
1090 }
1091 }
1092 }
1093
1094 void Arguments::print_jvm_args_on(outputStream* st) {
1095 if (_num_jvm_args > 0) {
1096 for (int i=0; i < _num_jvm_args; i++) {
1097 st->print("%s ", _jvm_args_array[i]);
1098 }
1099 }
1100 }
1101
1102 bool Arguments::process_argument(const char* arg,
1103 jboolean ignore_unrecognized,
1104 JVMFlagOrigin origin) {
1105 JDK_Version since = JDK_Version();
1106
1107 if (parse_argument(arg, origin)) {
1108 return true;
1109 }
1110
1111 // Determine if the flag has '+', '-', or '=' characters.
1112 bool has_plus_minus = (*arg == '+' || *arg == '-');
1113 const char* const argname = has_plus_minus ? arg + 1 : arg;
1114
1115 size_t arg_len;
1116 const char* equal_sign = strchr(argname, '=');
1117 if (equal_sign == nullptr) {
1118 arg_len = strlen(argname);
1119 } else {
1120 arg_len = equal_sign - argname;
1121 }
1122
1123 // Only make the obsolete check for valid arguments.
1124 if (arg_len <= BUFLEN) {
1125 // Construct a string which consists only of the argument name without '+', '-', or '='.
1126 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1127 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1128 if (is_obsolete_flag(stripped_argname, &since)) {
1129 char version[256];
1130 since.to_string(version, sizeof(version));
1131 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1132 return true;
1133 }
1134 }
1135
1136 // For locked flags, report a custom error message if available.
1137 // Otherwise, report the standard unrecognized VM option.
1138 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1139 if (found_flag != nullptr) {
1140 char locked_message_buf[BUFLEN];
1141 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1142 if (strlen(locked_message_buf) != 0) {
1143 #ifdef PRODUCT
1144 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1145 if (ignore_unrecognized && mismatched) {
1146 return true;
1147 }
1148 #endif
1149 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1150 }
1151 if (found_flag->is_bool() && !has_plus_minus) {
1152 jio_fprintf(defaultStream::error_stream(),
1153 "Missing +/- setting for VM option '%s'\n", argname);
1154 } else if (!found_flag->is_bool() && has_plus_minus) {
1155 jio_fprintf(defaultStream::error_stream(),
1156 "Unexpected +/- setting in VM option '%s'\n", argname);
1157 } else {
1158 jio_fprintf(defaultStream::error_stream(),
1159 "Improperly specified VM option '%s'\n", argname);
1160 }
1161 } else {
1162 if (ignore_unrecognized) {
1163 return true;
1164 }
1165 jio_fprintf(defaultStream::error_stream(),
1166 "Unrecognized VM option '%s'\n", argname);
1167 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1168 if (fuzzy_matched != nullptr) {
1169 jio_fprintf(defaultStream::error_stream(),
1170 "Did you mean '%s%s%s'?\n",
1171 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1172 fuzzy_matched->name(),
1173 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1174 }
1175 }
1176
1177 // allow for commandline "commenting out" options like -XX:#+Verbose
1178 return arg[0] == '#';
1179 }
1180
1181 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1182 FILE* stream = os::fopen(file_name, "rb");
1183 if (stream == nullptr) {
1184 if (should_exist) {
1185 jio_fprintf(defaultStream::error_stream(),
1186 "Could not open settings file %s\n", file_name);
1187 return false;
1188 } else {
1189 return true;
1190 }
1191 }
1192
1193 char token[1024];
1194 int pos = 0;
1195
1196 bool in_white_space = true;
1197 bool in_comment = false;
1198 bool in_quote = false;
1199 int quote_c = 0;
1200 bool result = true;
1201
1202 int c = getc(stream);
1203 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1204 if (in_white_space) {
1205 if (in_comment) {
1206 if (c == '\n') in_comment = false;
1207 } else {
1208 if (c == '#') in_comment = true;
1209 else if (!isspace(c)) {
1210 in_white_space = false;
1211 token[pos++] = checked_cast<char>(c);
1212 }
1213 }
1214 } else {
1215 if (c == '\n' || (!in_quote && isspace(c))) {
1216 // token ends at newline, or at unquoted whitespace
1217 // this allows a way to include spaces in string-valued options
1218 token[pos] = '\0';
1219 logOption(token);
1220 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1221 build_jvm_flags(token);
1222 pos = 0;
1223 in_white_space = true;
1224 in_quote = false;
1225 } else if (!in_quote && (c == '\'' || c == '"')) {
1226 in_quote = true;
1227 quote_c = c;
1228 } else if (in_quote && (c == quote_c)) {
1229 in_quote = false;
1230 } else {
1231 token[pos++] = checked_cast<char>(c);
1232 }
1233 }
1234 c = getc(stream);
1235 }
1236 if (pos > 0) {
1237 token[pos] = '\0';
1238 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1239 build_jvm_flags(token);
1240 }
1241 fclose(stream);
1242 return result;
1243 }
1244
1245 //=============================================================================================================
1246 // Parsing of properties (-D)
1247
1248 const char* Arguments::get_property(const char* key) {
1249 return PropertyList_get_value(system_properties(), key);
1250 }
1251
1252 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1253 const char* eq = strchr(prop, '=');
1254 const char* key;
1255 const char* value = "";
1256
1257 if (eq == nullptr) {
1258 // property doesn't have a value, thus use passed string
1259 key = prop;
1260 } else {
1261 // property have a value, thus extract it and save to the
1262 // allocated string
1263 size_t key_len = eq - prop;
1264 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1265
1266 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1267 key = tmp_key;
1268
1269 value = &prop[key_len + 1];
1270 }
1271
1272 if (internal == ExternalProperty) {
1273 CDSConfig::check_incompatible_property(key, value);
1274 }
1275
1276 if (strcmp(key, "java.compiler") == 0) {
1277 // we no longer support java.compiler system property, log a warning and let it get
1278 // passed to Java, like any other system property
1279 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1280 // for applications using NONE or empty value, log a more informative message
1281 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1282 } else {
1283 warning("The java.compiler system property is obsolete and no longer supported.");
1284 }
1285 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1286 // sun.java.launcher.is_altjvm property is
1287 // private and is processed in process_sun_java_launcher_properties();
1288 // the sun.java.launcher property is passed on to the java application
1289 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1290 // append is true, writable is true, internal is false
1291 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1292 WriteableProperty, ExternalProperty);
1293 } else {
1294 if (strcmp(key, "sun.java.command") == 0) {
1295 char *old_java_command = _java_command;
1296 _java_command = os::strdup_check_oom(value, mtArguments);
1297 if (old_java_command != nullptr) {
1298 os::free(old_java_command);
1299 }
1300 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1301 // If this property is set on the command line then its value will be
1302 // displayed in VM error logs as the URL at which to submit such logs.
1303 // Normally the URL displayed in error logs is different from the value
1304 // of this system property, so a different property should have been
1305 // used here, but we leave this as-is in case someone depends upon it.
1306 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1307 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1308 // its value without going through the property list or making a Java call.
1309 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1310 if (old_java_vendor_url_bug != nullptr) {
1311 os::free((void *)old_java_vendor_url_bug);
1312 }
1313 }
1314
1315 // Create new property and add at the end of the list
1316 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1317 }
1318
1319 if (key != prop) {
1320 // SystemProperty copy passed value, thus free previously allocated
1321 // memory
1322 FreeHeap((void *)key);
1323 }
1324
1325 return true;
1326 }
1327
1328 //===========================================================================================================
1329 // Setting int/mixed/comp mode flags
1330
1331 void Arguments::set_mode_flags(Mode mode) {
1332 // Set up default values for all flags.
1333 // If you add a flag to any of the branches below,
1334 // add a default value for it here.
1335 _mode = mode;
1336
1337 // Ensure Agent_OnLoad has the correct initial values.
1338 // This may not be the final mode; mode may change later in onload phase.
1339 PropertyList_unique_add(&_system_properties, "java.vm.info",
1340 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1341
1342 UseInterpreter = true;
1343 UseCompiler = true;
1344 UseLoopCounter = true;
1345
1346 // Default values may be platform/compiler dependent -
1347 // use the saved values
1348 ClipInlining = Arguments::_ClipInlining;
1349 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1350 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1351 BackgroundCompilation = Arguments::_BackgroundCompilation;
1352
1353 // Change from defaults based on mode
1354 switch (mode) {
1355 default:
1356 ShouldNotReachHere();
1357 break;
1358 case _int:
1359 UseCompiler = false;
1360 UseLoopCounter = false;
1361 AlwaysCompileLoopMethods = false;
1362 UseOnStackReplacement = false;
1363 break;
1364 case _mixed:
1365 // same as default
1366 break;
1367 case _comp:
1368 UseInterpreter = false;
1369 BackgroundCompilation = false;
1370 ClipInlining = false;
1371 break;
1372 }
1373 }
1374
1375 // Conflict: required to use shared spaces (-Xshare:on), but
1376 // incompatible command line options were chosen.
1377 void Arguments::no_shared_spaces(const char* message) {
1378 if (RequireSharedSpaces) {
1379 jio_fprintf(defaultStream::error_stream(),
1380 "Class data sharing is inconsistent with other specified options.\n");
1381 vm_exit_during_initialization("Unable to use shared archive", message);
1382 } else {
1383 log_info(cds)("Unable to use shared archive: %s", message);
1384 UseSharedSpaces = false;
1385 }
1386 }
1387
1388 static void set_object_alignment() {
1389 // Object alignment.
1390 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1391 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1392 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1393 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1394 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1395 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1396
1397 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1398 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1399
1400 // Oop encoding heap max
1401 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1402 }
1403
1404 size_t Arguments::max_heap_for_compressed_oops() {
1405 // Avoid sign flip.
1406 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1407 // We need to fit both the null page and the heap into the memory budget, while
1408 // keeping alignment constraints of the heap. To guarantee the latter, as the
1409 // null page is located before the heap, we pad the null page to the conservative
1410 // maximum alignment that the GC may ever impose upon the heap.
1411 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1412 _conservative_max_heap_alignment);
1413
1414 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1415 NOT_LP64(ShouldNotReachHere(); return 0);
1416 }
1417
1418 void Arguments::set_use_compressed_oops() {
1419 #ifdef _LP64
1420 // MaxHeapSize is not set up properly at this point, but
1421 // the only value that can override MaxHeapSize if we are
1422 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1423 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1424
1425 if (max_heap_size <= max_heap_for_compressed_oops()) {
1426 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1427 FLAG_SET_ERGO(UseCompressedOops, true);
1428 }
1429 } else {
1430 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1431 warning("Max heap size too large for Compressed Oops");
1432 FLAG_SET_DEFAULT(UseCompressedOops, false);
1433 }
1434 }
1435 #endif // _LP64
1436 }
1437
1438 void Arguments::set_use_compressed_klass_ptrs() {
1439 #ifdef _LP64
1440 assert(!UseCompressedClassPointers || CompressedClassSpaceSize <= KlassEncodingMetaspaceMax,
1441 "CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1442 #endif // _LP64
1443 }
1444
1445 void Arguments::set_conservative_max_heap_alignment() {
1446 // The conservative maximum required alignment for the heap is the maximum of
1447 // the alignments imposed by several sources: any requirements from the heap
1448 // itself and the maximum page size we may run the VM with.
1449 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1450 _conservative_max_heap_alignment = MAX4(heap_alignment,
1451 os::vm_allocation_granularity(),
1452 os::max_page_size(),
1453 GCArguments::compute_heap_alignment());
1454 }
1455
1456 jint Arguments::set_ergonomics_flags() {
1457 GCConfig::initialize();
1458
1459 set_conservative_max_heap_alignment();
1460
1461 #ifdef _LP64
1462 set_use_compressed_oops();
1463 set_use_compressed_klass_ptrs();
1464
1465 // Also checks that certain machines are slower with compressed oops
1466 // in vm_version initialization code.
1467 #endif // _LP64
1468
1469 return JNI_OK;
1470 }
1471
1472 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1473 size_t max_allocatable;
1474 size_t result = limit;
1475 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1476 // The AggressiveHeap check is a temporary workaround to avoid calling
1477 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1478 // selected. This works because AggressiveHeap implies UseParallelGC
1479 // where we know the ratio will be 1. Once the AggressiveHeap option is
1480 // removed, this can be cleaned up.
1481 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1482 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1483 result = MIN2(result, max_allocatable / fraction);
1484 }
1485 return result;
1486 }
1487
1488 // Use static initialization to get the default before parsing
1489 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1490
1491 void Arguments::set_heap_size() {
1492 julong phys_mem;
1493
1494 // If the user specified one of these options, they
1495 // want specific memory sizing so do not limit memory
1496 // based on compressed oops addressability.
1497 // Also, memory limits will be calculated based on
1498 // available os physical memory, not our MaxRAM limit,
1499 // unless MaxRAM is also specified.
1500 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1501 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1502 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1503 !FLAG_IS_DEFAULT(MaxRAM));
1504 if (override_coop_limit) {
1505 if (FLAG_IS_DEFAULT(MaxRAM)) {
1506 phys_mem = os::physical_memory();
1507 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1508 } else {
1509 phys_mem = (julong)MaxRAM;
1510 }
1511 } else {
1512 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1513 : (julong)MaxRAM;
1514 }
1515
1516 // If the maximum heap size has not been set with -Xmx,
1517 // then set it as fraction of the size of physical memory,
1518 // respecting the maximum and minimum sizes of the heap.
1519 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1520 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1521 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1522 if (reasonable_min < MaxHeapSize) {
1523 // Small physical memory, so use a minimum fraction of it for the heap
1524 reasonable_max = reasonable_min;
1525 } else {
1526 // Not-small physical memory, so require a heap at least
1527 // as large as MaxHeapSize
1528 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1529 }
1530
1531 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1532 // Limit the heap size to ErgoHeapSizeLimit
1533 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1534 }
1535
1536 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1537
1538 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1539 // An initial heap size was specified on the command line,
1540 // so be sure that the maximum size is consistent. Done
1541 // after call to limit_heap_by_allocatable_memory because that
1542 // method might reduce the allocation size.
1543 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1544 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1545 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1546 }
1547
1548 #ifdef _LP64
1549 if (UseCompressedOops || UseCompressedClassPointers) {
1550 // HeapBaseMinAddress can be greater than default but not less than.
1551 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1552 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1553 // matches compressed oops printing flags
1554 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1555 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1556 DefaultHeapBaseMinAddress,
1557 DefaultHeapBaseMinAddress/G,
1558 HeapBaseMinAddress);
1559 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1560 }
1561 }
1562 }
1563 if (UseCompressedOops) {
1564 // Limit the heap size to the maximum possible when using compressed oops
1565 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1566
1567 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1568 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1569 // but it should be not less than default MaxHeapSize.
1570 max_coop_heap -= HeapBaseMinAddress;
1571 }
1572
1573 // If user specified flags prioritizing os physical
1574 // memory limits, then disable compressed oops if
1575 // limits exceed max_coop_heap and UseCompressedOops
1576 // was not specified.
1577 if (reasonable_max > max_coop_heap) {
1578 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1579 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1580 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1581 "Please check the setting of MaxRAMPercentage %5.2f."
1582 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1583 FLAG_SET_ERGO(UseCompressedOops, false);
1584 } else {
1585 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1586 }
1587 }
1588 }
1589 #endif // _LP64
1590
1591 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1592 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1593 }
1594
1595 // If the minimum or initial heap_size have not been set or requested to be set
1596 // ergonomically, set them accordingly.
1597 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1598 julong reasonable_minimum = (julong)(OldSize + NewSize);
1599
1600 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1601
1602 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1603
1604 if (InitialHeapSize == 0) {
1605 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1606 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1607
1608 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1609 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1610
1611 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1612 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1613 }
1614 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1615 // synchronize with InitialHeapSize to avoid errors with the default value.
1616 if (MinHeapSize == 0) {
1617 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1618 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1619 }
1620 }
1621 }
1622
1623 // This option inspects the machine and attempts to set various
1624 // parameters to be optimal for long-running, memory allocation
1625 // intensive jobs. It is intended for machines with large
1626 // amounts of cpu and memory.
1627 jint Arguments::set_aggressive_heap_flags() {
1628 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1629 // VM, but we may not be able to represent the total physical memory
1630 // available (like having 8gb of memory on a box but using a 32bit VM).
1631 // Thus, we need to make sure we're using a julong for intermediate
1632 // calculations.
1633 julong initHeapSize;
1634 julong total_memory = os::physical_memory();
1635
1636 if (total_memory < (julong) 256 * M) {
1637 jio_fprintf(defaultStream::error_stream(),
1638 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1639 vm_exit(1);
1640 }
1641
1642 // The heap size is half of available memory, or (at most)
1643 // all of possible memory less 160mb (leaving room for the OS
1644 // when using ISM). This is the maximum; because adaptive sizing
1645 // is turned on below, the actual space used may be smaller.
1646
1647 initHeapSize = MIN2(total_memory / (julong) 2,
1648 total_memory - (julong) 160 * M);
1649
1650 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1651
1652 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1653 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1654 return JNI_EINVAL;
1655 }
1656 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1657 return JNI_EINVAL;
1658 }
1659 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1660 return JNI_EINVAL;
1661 }
1662 }
1663 if (FLAG_IS_DEFAULT(NewSize)) {
1664 // Make the young generation 3/8ths of the total heap.
1665 if (FLAG_SET_CMDLINE(NewSize,
1666 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1667 return JNI_EINVAL;
1668 }
1669 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1670 return JNI_EINVAL;
1671 }
1672 }
1673
1674 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1675 FLAG_SET_DEFAULT(UseLargePages, true);
1676 #endif
1677
1678 // Increase some data structure sizes for efficiency
1679 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1680 return JNI_EINVAL;
1681 }
1682 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1683 return JNI_EINVAL;
1684 }
1685 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1686 return JNI_EINVAL;
1687 }
1688
1689 // See the OldPLABSize comment below, but replace 'after promotion'
1690 // with 'after copying'. YoungPLABSize is the size of the survivor
1691 // space per-gc-thread buffers. The default is 4kw.
1692 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1693 return JNI_EINVAL;
1694 }
1695
1696 // OldPLABSize is the size of the buffers in the old gen that
1697 // UseParallelGC uses to promote live data that doesn't fit in the
1698 // survivor spaces. At any given time, there's one for each gc thread.
1699 // The default size is 1kw. These buffers are rarely used, since the
1700 // survivor spaces are usually big enough. For specjbb, however, there
1701 // are occasions when there's lots of live data in the young gen
1702 // and we end up promoting some of it. We don't have a definite
1703 // explanation for why bumping OldPLABSize helps, but the theory
1704 // is that a bigger PLAB results in retaining something like the
1705 // original allocation order after promotion, which improves mutator
1706 // locality. A minor effect may be that larger PLABs reduce the
1707 // number of PLAB allocation events during gc. The value of 8kw
1708 // was arrived at by experimenting with specjbb.
1709 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1710 return JNI_EINVAL;
1711 }
1712
1713 // Enable parallel GC and adaptive generation sizing
1714 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1715 return JNI_EINVAL;
1716 }
1717
1718 // Encourage steady state memory management
1719 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1720 return JNI_EINVAL;
1721 }
1722
1723 return JNI_OK;
1724 }
1725
1726 // This must be called after ergonomics.
1727 void Arguments::set_bytecode_flags() {
1728 if (!RewriteBytecodes) {
1729 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1730 }
1731 }
1732
1733 // Aggressive optimization flags
1734 jint Arguments::set_aggressive_opts_flags() {
1735 #ifdef COMPILER2
1736 if (AggressiveUnboxing) {
1737 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1738 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1739 } else if (!EliminateAutoBox) {
1740 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1741 AggressiveUnboxing = false;
1742 }
1743 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1744 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1745 } else if (!DoEscapeAnalysis) {
1746 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1747 AggressiveUnboxing = false;
1748 }
1749 }
1750 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1751 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1752 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1753 }
1754 // Feed the cache size setting into the JDK
1755 char buffer[1024];
1756 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1757 if (!add_property(buffer)) {
1758 return JNI_ENOMEM;
1759 }
1760 }
1761 #endif
1762
1763 return JNI_OK;
1764 }
1765
1766 //===========================================================================================================
1767
1768 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1769 if (_sun_java_launcher != _default_java_launcher) {
1770 os::free(const_cast<char*>(_sun_java_launcher));
1771 }
1772 _sun_java_launcher = os::strdup_check_oom(launcher);
1773 }
1774
1775 bool Arguments::created_by_java_launcher() {
1776 assert(_sun_java_launcher != nullptr, "property must have value");
1777 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1778 }
1779
1780 bool Arguments::sun_java_launcher_is_altjvm() {
1781 return _sun_java_launcher_is_altjvm;
1782 }
1783
1784 //===========================================================================================================
1785 // Parsing of main arguments
1786
1787 unsigned int addreads_count = 0;
1788 unsigned int addexports_count = 0;
1789 unsigned int addopens_count = 0;
1790 unsigned int addmods_count = 0;
1791 unsigned int enable_native_access_count = 0;
1792
1793 // Check the consistency of vm_init_args
1794 bool Arguments::check_vm_args_consistency() {
1795 // Method for adding checks for flag consistency.
1796 // The intent is to warn the user of all possible conflicts,
1797 // before returning an error.
1798 // Note: Needs platform-dependent factoring.
1799 bool status = true;
1800
1801 if (TLABRefillWasteFraction == 0) {
1802 jio_fprintf(defaultStream::error_stream(),
1803 "TLABRefillWasteFraction should be a denominator, "
1804 "not " SIZE_FORMAT "\n",
1805 TLABRefillWasteFraction);
1806 status = false;
1807 }
1808
1809 status = CompilerConfig::check_args_consistency(status);
1810 #if INCLUDE_JVMCI
1811 if (status && EnableJVMCI) {
1812 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1813 AddProperty, UnwriteableProperty, InternalProperty);
1814 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1815 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
1816 return false;
1817 }
1818 }
1819 }
1820 #endif
1821
1822 #if INCLUDE_JFR
1823 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1824 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) {
1825 return false;
1826 }
1827 }
1828 #endif
1829
1830 #ifndef SUPPORT_RESERVED_STACK_AREA
1831 if (StackReservedPages != 0) {
1832 FLAG_SET_CMDLINE(StackReservedPages, 0);
1833 warning("Reserved Stack Area not supported on this platform");
1834 }
1835 #endif
1836
1837 if (AMD64_ONLY(false &&) AARCH64_ONLY(false &&) !FLAG_IS_DEFAULT(InlineTypePassFieldsAsArgs)) {
1838 FLAG_SET_CMDLINE(InlineTypePassFieldsAsArgs, false);
1839 warning("InlineTypePassFieldsAsArgs is not supported on this platform");
1840 }
1841
1842 if (AMD64_ONLY(false &&) AARCH64_ONLY(false &&) !FLAG_IS_DEFAULT(InlineTypeReturnedAsFields)) {
1843 FLAG_SET_CMDLINE(InlineTypeReturnedAsFields, false);
1844 warning("InlineTypeReturnedAsFields is not supported on this platform");
1845 }
1846
1847 #if !defined(X86) && !defined(AARCH64) && !defined(RISCV64) && !defined(ARM) && !defined(PPC64) && !defined(S390)
1848 if (LockingMode == LM_LIGHTWEIGHT) {
1849 FLAG_SET_CMDLINE(LockingMode, LM_LEGACY);
1850 warning("New lightweight locking not supported on this platform");
1851 }
1852 #endif
1853
1854 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1855 if (LockingMode == LM_MONITOR) {
1856 jio_fprintf(defaultStream::error_stream(),
1857 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1858 return false;
1859 }
1860 #endif
1861 #if defined(X86) && !defined(ZERO)
1862 if (LockingMode == LM_MONITOR && UseRTMForStackLocks) {
1863 jio_fprintf(defaultStream::error_stream(),
1864 "LockingMode == 0 (LM_MONITOR) and -XX:+UseRTMForStackLocks are mutually exclusive\n");
1865
1866 return false;
1867 }
1868 #endif
1869 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1870 jio_fprintf(defaultStream::error_stream(),
1871 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1872 return false;
1873 }
1874 return status;
1875 }
1876
1877 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1878 const char* option_type) {
1879 if (ignore) return false;
1880
1881 const char* spacer = " ";
1882 if (option_type == nullptr) {
1883 option_type = ++spacer; // Set both to the empty string.
1884 }
1885
1886 jio_fprintf(defaultStream::error_stream(),
1887 "Unrecognized %s%soption: %s\n", option_type, spacer,
1888 option->optionString);
1889 return true;
1890 }
1891
1892 static const char* user_assertion_options[] = {
1893 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1894 };
1895
1896 static const char* system_assertion_options[] = {
1897 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1898 };
1899
1900 bool Arguments::parse_uint(const char* value,
1901 uint* uint_arg,
1902 uint min_size) {
1903 uint n;
1904 if (!parse_integer(value, &n)) {
1905 return false;
1906 }
1907 if (n >= min_size) {
1908 *uint_arg = n;
1909 return true;
1910 } else {
1911 return false;
1912 }
1913 }
1914
1915 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1916 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1917 CDSConfig::check_internal_module_property(prop_name, prop_value);
1918 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1919 char* property = AllocateHeap(prop_len, mtArguments);
1920 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1921 if (ret < 0 || ret >= (int)prop_len) {
1922 FreeHeap(property);
1923 return false;
1924 }
1925 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1926 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1927 // that multiple occurrences of the associated flag just causes the existing property value to be
1928 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1929 // to a property after we have finished flag processing.
1930 bool added = add_property(property, WriteableProperty, internal);
1931 FreeHeap(property);
1932 return added;
1933 }
1934
1935 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1936 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1937 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1938 const unsigned int props_count_limit = 1000;
1939 const int max_digits = 3;
1940 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1941
1942 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1943 if (count < props_count_limit) {
1944 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1945 char* property = AllocateHeap(prop_len, mtArguments);
1946 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1947 if (ret < 0 || ret >= (int)prop_len) {
1948 FreeHeap(property);
1949 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1950 return false;
1951 }
1952 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1953 FreeHeap(property);
1954 return added;
1955 }
1956
1957 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1958 return false;
1959 }
1960
1961 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1962 julong* long_arg,
1963 julong min_size,
1964 julong max_size) {
1965 if (!parse_integer(s, long_arg)) return arg_unreadable;
1966 return check_memory_size(*long_arg, min_size, max_size);
1967 }
1968
1969 // Parse JavaVMInitArgs structure
1970
1971 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1972 const JavaVMInitArgs *java_tool_options_args,
1973 const JavaVMInitArgs *java_options_args,
1974 const JavaVMInitArgs *cmd_line_args) {
1975 // Save default settings for some mode flags
1976 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1977 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1978 Arguments::_ClipInlining = ClipInlining;
1979 Arguments::_BackgroundCompilation = BackgroundCompilation;
1980
1981 // Remember the default value of SharedBaseAddress.
1982 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1983
1984 // Setup flags for mixed which is the default
1985 set_mode_flags(_mixed);
1986
1987 // Parse args structure generated from java.base vm options resource
1988 jint result = parse_each_vm_init_arg(vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE);
1989 if (result != JNI_OK) {
1990 return result;
1991 }
1992
1993 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
1994 // variable (if present).
1995 result = parse_each_vm_init_arg(java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR);
1996 if (result != JNI_OK) {
1997 return result;
1998 }
1999
2000 // Parse args structure generated from the command line flags.
2001 result = parse_each_vm_init_arg(cmd_line_args, JVMFlagOrigin::COMMAND_LINE);
2002 if (result != JNI_OK) {
2003 return result;
2004 }
2005
2006 // Parse args structure generated from the _JAVA_OPTIONS environment
2007 // variable (if present) (mimics classic VM)
2008 result = parse_each_vm_init_arg(java_options_args, JVMFlagOrigin::ENVIRON_VAR);
2009 if (result != JNI_OK) {
2010 return result;
2011 }
2012
2013 // Disable CDS for exploded image
2014 if (!has_jimage()) {
2015 no_shared_spaces("CDS disabled on exploded JDK");
2016 }
2017
2018 // We need to ensure processor and memory resources have been properly
2019 // configured - which may rely on arguments we just processed - before
2020 // doing the final argument processing. Any argument processing that
2021 // needs to know about processor and memory resources must occur after
2022 // this point.
2023
2024 os::init_container_support();
2025
2026 SystemMemoryBarrier::initialize();
2027
2028 // Do final processing now that all arguments have been parsed
2029 result = finalize_vm_init_args();
2030 if (result != JNI_OK) {
2031 return result;
2032 }
2033
2034 return JNI_OK;
2035 }
2036
2037 #if !INCLUDE_JVMTI
2038 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2039 // represents a valid JDWP agent. is_path==true denotes that we
2040 // are dealing with -agentpath (case where name is a path), otherwise with
2041 // -agentlib
2042 static bool valid_jdwp_agent(char *name, bool is_path) {
2043 char *_name;
2044 const char *_jdwp = "jdwp";
2045 size_t _len_jdwp, _len_prefix;
2046
2047 if (is_path) {
2048 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2049 return false;
2050 }
2051
2052 _name++; // skip past last path separator
2053 _len_prefix = strlen(JNI_LIB_PREFIX);
2054
2055 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2056 return false;
2057 }
2058
2059 _name += _len_prefix;
2060 _len_jdwp = strlen(_jdwp);
2061
2062 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2063 _name += _len_jdwp;
2064 }
2065 else {
2066 return false;
2067 }
2068
2069 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2070 return false;
2071 }
2072
2073 return true;
2074 }
2075
2076 if (strcmp(name, _jdwp) == 0) {
2077 return true;
2078 }
2079
2080 return false;
2081 }
2082 #endif
2083
2084 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2085 // --patch-module=<module>=<file>(<pathsep><file>)*
2086 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2087 // Find the equal sign between the module name and the path specification
2088 const char* module_equal = strchr(patch_mod_tail, '=');
2089 if (module_equal == nullptr) {
2090 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2091 return JNI_ERR;
2092 } else {
2093 // Pick out the module name
2094 size_t module_len = module_equal - patch_mod_tail;
2095 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2096 if (module_name != nullptr) {
2097 memcpy(module_name, patch_mod_tail, module_len);
2098 *(module_name + module_len) = '\0';
2099 // The path piece begins one past the module_equal sign
2100 add_patch_mod_prefix(module_name, module_equal + 1, false /* no append */, false /* no cds */);
2101 FREE_C_HEAP_ARRAY(char, module_name);
2102 } else {
2103 return JNI_ENOMEM;
2104 }
2105 }
2106 return JNI_OK;
2107 }
2108
2109 // VALUECLASS_STR must match string used in the build
2110 #define VALUECLASS_STR "valueclasses"
2111 #define VALUECLASS_JAR "-" VALUECLASS_STR ".jar"
2112
2113 // Finalize --patch-module args and --enable-preview related to value class module patches.
2114 // Create all numbered properties passing module patches.
2115 int Arguments::finalize_patch_module() {
2116 // If --enable-preview and EnableValhalla is true, each module may have value classes that
2117 // are to be patched into the module.
2118 // For each <module>-valueclasses.jar in <JAVA_HOME>/lib/valueclasses/
2119 // appends the equivalent of --patch-module <module>=<JAVA_HOME>/lib/valueclasses/<module>-valueclasses.jar
2120 if (enable_preview() && EnableValhalla) {
2121 char * valueclasses_dir = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2122 const char * fileSep = os::file_separator();
2123
2124 jio_snprintf(valueclasses_dir, JVM_MAXPATHLEN, "%s%slib%s" VALUECLASS_STR "%s",
2125 Arguments::get_java_home(), fileSep, fileSep, fileSep);
2126 DIR* dir = os::opendir(valueclasses_dir);
2127 if (dir != nullptr) {
2128 char * module_name = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2129 char * path = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2130
2131 for (dirent * entry = os::readdir(dir); entry != nullptr; entry = os::readdir(dir)) {
2132 // Test if file ends-with "-valueclasses.jar"
2133 int len = (int)strlen(entry->d_name) - (sizeof(VALUECLASS_JAR) - 1);
2134 if (len <= 0 || strcmp(&entry->d_name[len], VALUECLASS_JAR) != 0) {
2135 continue; // too short or not the expected suffix
2136 }
2137
2138 strcpy(module_name, entry->d_name);
2139 module_name[len] = '\0'; // truncate to just module-name
2140
2141 jio_snprintf(path, JVM_MAXPATHLEN, "%s%s", valueclasses_dir, &entry->d_name);
2142 add_patch_mod_prefix(module_name, path, true /* append */, true /* cds OK*/);
2143 log_info(class)("--enable-preview appending value classes for module %s: %s", module_name, entry->d_name);
2144 }
2145 FreeHeap(module_name);
2146 FreeHeap(path);
2147 os::closedir(dir);
2148 }
2149 FreeHeap(valueclasses_dir);
2150 }
2151
2152 // Create numbered properties for each module that has been patched either
2153 // by --patch-module or --enable-preview
2154 // Format is "jdk.module.patch.<n>=<module_name>=<path>"
2155 if (_patch_mod_prefix != nullptr) {
2156 char * prop_value = AllocateHeap(JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, mtArguments);
2157 unsigned int patch_mod_count = 0;
2158
2159 for (GrowableArrayIterator<ModulePatchPath *> it = _patch_mod_prefix->begin();
2160 it != _patch_mod_prefix->end(); ++it) {
2161 jio_snprintf(prop_value, JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, "%s=%s",
2162 (*it)->module_name(), (*it)->path_string());
2163 if (!create_numbered_module_property("jdk.module.patch", prop_value, patch_mod_count++)) {
2164 FreeHeap(prop_value);
2165 return JNI_ENOMEM;
2166 }
2167 }
2168 FreeHeap(prop_value);
2169 }
2170 return JNI_OK;
2171 }
2172
2173 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2174 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2175 // The min and max sizes match the values in globals.hpp, but scaled
2176 // with K. The values have been chosen so that alignment with page
2177 // size doesn't change the max value, which makes the conversions
2178 // back and forth between Xss value and ThreadStackSize value easier.
2179 // The values have also been chosen to fit inside a 32-bit signed type.
2180 const julong min_ThreadStackSize = 0;
2181 const julong max_ThreadStackSize = 1 * M;
2182
2183 // Make sure the above values match the range set in globals.hpp
2184 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2185 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2186 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2187
2188 const julong min_size = min_ThreadStackSize * K;
2189 const julong max_size = max_ThreadStackSize * K;
2190
2191 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2192
2193 julong size = 0;
2194 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2195 if (errcode != arg_in_range) {
2196 bool silent = (option == nullptr); // Allow testing to silence error messages
2197 if (!silent) {
2198 jio_fprintf(defaultStream::error_stream(),
2199 "Invalid thread stack size: %s\n", option->optionString);
2200 describe_range_error(errcode);
2201 }
2202 return JNI_EINVAL;
2203 }
2204
2205 // Internally track ThreadStackSize in units of 1024 bytes.
2206 const julong size_aligned = align_up(size, K);
2207 assert(size <= size_aligned,
2208 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2209 size, size_aligned);
2210
2211 const julong size_in_K = size_aligned / K;
2212 assert(size_in_K < (julong)max_intx,
2213 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2214 size_in_K);
2215
2216 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2217 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2218 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2219 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2220 max_expanded, size_in_K);
2221
2222 *out_ThreadStackSize = (intx)size_in_K;
2223
2224 return JNI_OK;
2225 }
2226
2227 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2228 // For match_option to return remaining or value part of option string
2229 const char* tail;
2230
2231 // iterate over arguments
2232 for (int index = 0; index < args->nOptions; index++) {
2233 bool is_absolute_path = false; // for -agentpath vs -agentlib
2234
2235 const JavaVMOption* option = args->options + index;
2236
2237 if (!match_option(option, "-Djava.class.path", &tail) &&
2238 !match_option(option, "-Dsun.java.command", &tail) &&
2239 !match_option(option, "-Dsun.java.launcher", &tail)) {
2240
2241 // add all jvm options to the jvm_args string. This string
2242 // is used later to set the java.vm.args PerfData string constant.
2243 // the -Djava.class.path and the -Dsun.java.command options are
2244 // omitted from jvm_args string as each have their own PerfData
2245 // string constant object.
2246 build_jvm_args(option->optionString);
2247 }
2248
2249 // -verbose:[class/module/gc/jni]
2250 if (match_option(option, "-verbose", &tail)) {
2251 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2252 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2253 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2254 } else if (!strcmp(tail, ":module")) {
2255 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2256 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2257 } else if (!strcmp(tail, ":gc")) {
2258 if (_legacyGCLogging.lastFlag == 0) {
2259 _legacyGCLogging.lastFlag = 1;
2260 }
2261 } else if (!strcmp(tail, ":jni")) {
2262 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2263 }
2264 // -da / -ea / -disableassertions / -enableassertions
2265 // These accept an optional class/package name separated by a colon, e.g.,
2266 // -da:java.lang.Thread.
2267 } else if (match_option(option, user_assertion_options, &tail, true)) {
2268 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2269 if (*tail == '\0') {
2270 JavaAssertions::setUserClassDefault(enable);
2271 } else {
2272 assert(*tail == ':', "bogus match by match_option()");
2273 JavaAssertions::addOption(tail + 1, enable);
2274 }
2275 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2276 } else if (match_option(option, system_assertion_options, &tail, false)) {
2277 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2278 JavaAssertions::setSystemClassDefault(enable);
2279 // -bootclasspath:
2280 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2281 jio_fprintf(defaultStream::output_stream(),
2282 "-Xbootclasspath is no longer a supported option.\n");
2283 return JNI_EINVAL;
2284 // -bootclasspath/a:
2285 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2286 Arguments::append_sysclasspath(tail);
2287 // -bootclasspath/p:
2288 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2289 jio_fprintf(defaultStream::output_stream(),
2290 "-Xbootclasspath/p is no longer a supported option.\n");
2291 return JNI_EINVAL;
2292 // -Xrun
2293 } else if (match_option(option, "-Xrun", &tail)) {
2294 if (tail != nullptr) {
2295 const char* pos = strchr(tail, ':');
2296 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2297 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2298 jio_snprintf(name, len + 1, "%s", tail);
2299
2300 char *options = nullptr;
2301 if(pos != nullptr) {
2302 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2303 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2304 }
2305 #if !INCLUDE_JVMTI
2306 if (strcmp(name, "jdwp") == 0) {
2307 jio_fprintf(defaultStream::error_stream(),
2308 "Debugging agents are not supported in this VM\n");
2309 return JNI_ERR;
2310 }
2311 #endif // !INCLUDE_JVMTI
2312 JvmtiAgentList::add_xrun(name, options, false);
2313 FREE_C_HEAP_ARRAY(char, name);
2314 FREE_C_HEAP_ARRAY(char, options);
2315 }
2316 } else if (match_option(option, "--add-reads=", &tail)) {
2317 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2318 return JNI_ENOMEM;
2319 }
2320 } else if (match_option(option, "--add-exports=", &tail)) {
2321 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2322 return JNI_ENOMEM;
2323 }
2324 } else if (match_option(option, "--add-opens=", &tail)) {
2325 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2326 return JNI_ENOMEM;
2327 }
2328 } else if (match_option(option, "--add-modules=", &tail)) {
2329 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2330 return JNI_ENOMEM;
2331 }
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, "--limit-modules=", &tail)) {
2337 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2338 return JNI_ENOMEM;
2339 }
2340 } else if (match_option(option, "--module-path=", &tail)) {
2341 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2342 return JNI_ENOMEM;
2343 }
2344 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2345 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2346 return JNI_ENOMEM;
2347 }
2348 } else if (match_option(option, "--patch-module=", &tail)) {
2349 // --patch-module=<module>=<file>(<pathsep><file>)*
2350 int res = process_patch_mod_option(tail);
2351 if (res != JNI_OK) {
2352 return res;
2353 }
2354 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2355 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2356 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2357 AddProperty, WriteableProperty, InternalProperty);
2358 } else {
2359 jio_fprintf(defaultStream::error_stream(),
2360 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2361 return JNI_ERR;
2362 }
2363 } else if (match_option(option, "--illegal-access=", &tail)) {
2364 char version[256];
2365 JDK_Version::jdk(17).to_string(version, sizeof(version));
2366 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2367 // -agentlib and -agentpath
2368 } else if (match_option(option, "-agentlib:", &tail) ||
2369 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2370 if(tail != nullptr) {
2371 const char* pos = strchr(tail, '=');
2372 char* name;
2373 if (pos == nullptr) {
2374 name = os::strdup_check_oom(tail, mtArguments);
2375 } else {
2376 size_t len = pos - tail;
2377 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2378 memcpy(name, tail, len);
2379 name[len] = '\0';
2380 }
2381
2382 char *options = nullptr;
2383 if(pos != nullptr) {
2384 options = os::strdup_check_oom(pos + 1, mtArguments);
2385 }
2386 #if !INCLUDE_JVMTI
2387 if (valid_jdwp_agent(name, is_absolute_path)) {
2388 jio_fprintf(defaultStream::error_stream(),
2389 "Debugging agents are not supported in this VM\n");
2390 return JNI_ERR;
2391 }
2392 #endif // !INCLUDE_JVMTI
2393 JvmtiAgentList::add(name, options, is_absolute_path);
2394 os::free(name);
2395 os::free(options);
2396 }
2397 // -javaagent
2398 } else if (match_option(option, "-javaagent:", &tail)) {
2399 #if !INCLUDE_JVMTI
2400 jio_fprintf(defaultStream::error_stream(),
2401 "Instrumentation agents are not supported in this VM\n");
2402 return JNI_ERR;
2403 #else
2404 if (tail != nullptr) {
2405 size_t length = strlen(tail) + 1;
2406 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2407 jio_snprintf(options, length, "%s", tail);
2408 JvmtiAgentList::add("instrument", options, false);
2409 FREE_C_HEAP_ARRAY(char, options);
2410
2411 // java agents need module java.instrument
2412 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2413 return JNI_ENOMEM;
2414 }
2415 }
2416 #endif // !INCLUDE_JVMTI
2417 // --enable_preview
2418 } else if (match_option(option, "--enable-preview")) {
2419 set_enable_preview();
2420 // --enable-preview enables Valhalla, EnableValhalla VM option will eventually be removed before integration
2421 if (FLAG_SET_CMDLINE(EnableValhalla, true) != JVMFlag::SUCCESS) {
2422 return JNI_EINVAL;
2423 }
2424 // -Xnoclassgc
2425 } else if (match_option(option, "-Xnoclassgc")) {
2426 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2427 return JNI_EINVAL;
2428 }
2429 // -Xbatch
2430 } else if (match_option(option, "-Xbatch")) {
2431 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2432 return JNI_EINVAL;
2433 }
2434 // -Xmn for compatibility with other JVM vendors
2435 } else if (match_option(option, "-Xmn", &tail)) {
2436 julong long_initial_young_size = 0;
2437 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2438 if (errcode != arg_in_range) {
2439 jio_fprintf(defaultStream::error_stream(),
2440 "Invalid initial young generation size: %s\n", option->optionString);
2441 describe_range_error(errcode);
2442 return JNI_EINVAL;
2443 }
2444 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2445 return JNI_EINVAL;
2446 }
2447 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2448 return JNI_EINVAL;
2449 }
2450 // -Xms
2451 } else if (match_option(option, "-Xms", &tail)) {
2452 julong size = 0;
2453 // an initial heap size of 0 means automatically determine
2454 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2455 if (errcode != arg_in_range) {
2456 jio_fprintf(defaultStream::error_stream(),
2457 "Invalid initial heap size: %s\n", option->optionString);
2458 describe_range_error(errcode);
2459 return JNI_EINVAL;
2460 }
2461 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2462 return JNI_EINVAL;
2463 }
2464 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2465 return JNI_EINVAL;
2466 }
2467 // -Xmx
2468 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2469 julong long_max_heap_size = 0;
2470 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2471 if (errcode != arg_in_range) {
2472 jio_fprintf(defaultStream::error_stream(),
2473 "Invalid maximum heap size: %s\n", option->optionString);
2474 describe_range_error(errcode);
2475 return JNI_EINVAL;
2476 }
2477 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2478 return JNI_EINVAL;
2479 }
2480 // Xmaxf
2481 } else if (match_option(option, "-Xmaxf", &tail)) {
2482 char* err;
2483 int maxf = (int)(strtod(tail, &err) * 100);
2484 if (*err != '\0' || *tail == '\0') {
2485 jio_fprintf(defaultStream::error_stream(),
2486 "Bad max heap free percentage size: %s\n",
2487 option->optionString);
2488 return JNI_EINVAL;
2489 } else {
2490 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2491 return JNI_EINVAL;
2492 }
2493 }
2494 // Xminf
2495 } else if (match_option(option, "-Xminf", &tail)) {
2496 char* err;
2497 int minf = (int)(strtod(tail, &err) * 100);
2498 if (*err != '\0' || *tail == '\0') {
2499 jio_fprintf(defaultStream::error_stream(),
2500 "Bad min heap free percentage size: %s\n",
2501 option->optionString);
2502 return JNI_EINVAL;
2503 } else {
2504 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2505 return JNI_EINVAL;
2506 }
2507 }
2508 // -Xss
2509 } else if (match_option(option, "-Xss", &tail)) {
2510 intx value = 0;
2511 jint err = parse_xss(option, tail, &value);
2512 if (err != JNI_OK) {
2513 return err;
2514 }
2515 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2516 return JNI_EINVAL;
2517 }
2518 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2519 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2520 julong long_ReservedCodeCacheSize = 0;
2521
2522 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2523 if (errcode != arg_in_range) {
2524 jio_fprintf(defaultStream::error_stream(),
2525 "Invalid maximum code cache size: %s.\n", option->optionString);
2526 return JNI_EINVAL;
2527 }
2528 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2529 return JNI_EINVAL;
2530 }
2531 // -green
2532 } else if (match_option(option, "-green")) {
2533 jio_fprintf(defaultStream::error_stream(),
2534 "Green threads support not available\n");
2535 return JNI_EINVAL;
2536 // -native
2537 } else if (match_option(option, "-native")) {
2538 // HotSpot always uses native threads, ignore silently for compatibility
2539 // -Xrs
2540 } else if (match_option(option, "-Xrs")) {
2541 // Classic/EVM option, new functionality
2542 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2543 return JNI_EINVAL;
2544 }
2545 // -Xprof
2546 } else if (match_option(option, "-Xprof")) {
2547 char version[256];
2548 // Obsolete in JDK 10
2549 JDK_Version::jdk(10).to_string(version, sizeof(version));
2550 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2551 // -Xinternalversion
2552 } else if (match_option(option, "-Xinternalversion")) {
2553 jio_fprintf(defaultStream::output_stream(), "%s\n",
2554 VM_Version::internal_vm_info_string());
2555 vm_exit(0);
2556 #ifndef PRODUCT
2557 // -Xprintflags
2558 } else if (match_option(option, "-Xprintflags")) {
2559 JVMFlag::printFlags(tty, false);
2560 vm_exit(0);
2561 #endif
2562 // -D
2563 } else if (match_option(option, "-D", &tail)) {
2564 const char* value;
2565 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2566 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2567 // abort if -Djava.endorsed.dirs is set
2568 jio_fprintf(defaultStream::output_stream(),
2569 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2570 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2571 return JNI_EINVAL;
2572 }
2573 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2574 *value != '\0' && strcmp(value, "\"\"") != 0) {
2575 // abort if -Djava.ext.dirs is set
2576 jio_fprintf(defaultStream::output_stream(),
2577 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2578 return JNI_EINVAL;
2579 }
2580 // Check for module related properties. They must be set using the modules
2581 // options. For example: use "--add-modules=java.sql", not
2582 // "-Djdk.module.addmods=java.sql"
2583 if (is_internal_module_property(option->optionString + 2)) {
2584 needs_module_property_warning = true;
2585 continue;
2586 }
2587 if (!add_property(tail)) {
2588 return JNI_ENOMEM;
2589 }
2590 // Out of the box management support
2591 if (match_option(option, "-Dcom.sun.management", &tail)) {
2592 #if INCLUDE_MANAGEMENT
2593 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2594 return JNI_EINVAL;
2595 }
2596 // management agent in module jdk.management.agent
2597 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2598 return JNI_ENOMEM;
2599 }
2600 #else
2601 jio_fprintf(defaultStream::output_stream(),
2602 "-Dcom.sun.management is not supported in this VM.\n");
2603 return JNI_ERR;
2604 #endif
2605 }
2606 // -Xint
2607 } else if (match_option(option, "-Xint")) {
2608 set_mode_flags(_int);
2609 mode_flag_cmd_line = true;
2610 // -Xmixed
2611 } else if (match_option(option, "-Xmixed")) {
2612 set_mode_flags(_mixed);
2613 mode_flag_cmd_line = true;
2614 // -Xcomp
2615 } else if (match_option(option, "-Xcomp")) {
2616 // for testing the compiler; turn off all flags that inhibit compilation
2617 set_mode_flags(_comp);
2618 mode_flag_cmd_line = true;
2619 // -Xshare:dump
2620 } else if (match_option(option, "-Xshare:dump")) {
2621 CDSConfig::enable_dumping_static_archive();
2622 // -Xshare:on
2623 } else if (match_option(option, "-Xshare:on")) {
2624 UseSharedSpaces = true;
2625 RequireSharedSpaces = true;
2626 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2627 } else if (match_option(option, "-Xshare:auto")) {
2628 UseSharedSpaces = true;
2629 RequireSharedSpaces = false;
2630 xshare_auto_cmd_line = true;
2631 // -Xshare:off
2632 } else if (match_option(option, "-Xshare:off")) {
2633 UseSharedSpaces = false;
2634 RequireSharedSpaces = false;
2635 // -Xverify
2636 } else if (match_option(option, "-Xverify", &tail)) {
2637 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2638 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2639 return JNI_EINVAL;
2640 }
2641 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2642 return JNI_EINVAL;
2643 }
2644 } else if (strcmp(tail, ":remote") == 0) {
2645 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2646 return JNI_EINVAL;
2647 }
2648 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2649 return JNI_EINVAL;
2650 }
2651 } else if (strcmp(tail, ":none") == 0) {
2652 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2653 return JNI_EINVAL;
2654 }
2655 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2656 return JNI_EINVAL;
2657 }
2658 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2659 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2660 return JNI_EINVAL;
2661 }
2662 // -Xdebug
2663 } else if (match_option(option, "-Xdebug")) {
2664 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2665 } else if (match_option(option, "-Xloggc:", &tail)) {
2666 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2667 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2668 _legacyGCLogging.lastFlag = 2;
2669 _legacyGCLogging.file = os::strdup_check_oom(tail);
2670 } else if (match_option(option, "-Xlog", &tail)) {
2671 bool ret = false;
2672 if (strcmp(tail, ":help") == 0) {
2673 fileStream stream(defaultStream::output_stream());
2674 LogConfiguration::print_command_line_help(&stream);
2675 vm_exit(0);
2676 } else if (strcmp(tail, ":disable") == 0) {
2677 LogConfiguration::disable_logging();
2678 ret = true;
2679 } else if (strcmp(tail, ":async") == 0) {
2680 LogConfiguration::set_async_mode(true);
2681 ret = true;
2682 } else if (*tail == '\0') {
2683 ret = LogConfiguration::parse_command_line_arguments();
2684 assert(ret, "-Xlog without arguments should never fail to parse");
2685 } else if (*tail == ':') {
2686 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2687 }
2688 if (ret == false) {
2689 jio_fprintf(defaultStream::error_stream(),
2690 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2691 tail);
2692 return JNI_EINVAL;
2693 }
2694 // JNI hooks
2695 } else if (match_option(option, "-Xcheck", &tail)) {
2696 if (!strcmp(tail, ":jni")) {
2697 #if !INCLUDE_JNI_CHECK
2698 warning("JNI CHECKING is not supported in this VM");
2699 #else
2700 CheckJNICalls = true;
2701 #endif // INCLUDE_JNI_CHECK
2702 } else if (is_bad_option(option, args->ignoreUnrecognized,
2703 "check")) {
2704 return JNI_EINVAL;
2705 }
2706 } else if (match_option(option, "vfprintf")) {
2707 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2708 } else if (match_option(option, "exit")) {
2709 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2710 } else if (match_option(option, "abort")) {
2711 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2712 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2713 // and the last option wins.
2714 } else if (match_option(option, "-XX:+NeverTenure")) {
2715 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2716 return JNI_EINVAL;
2717 }
2718 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2719 return JNI_EINVAL;
2720 }
2721 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2722 return JNI_EINVAL;
2723 }
2724 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2725 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2726 return JNI_EINVAL;
2727 }
2728 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2729 return JNI_EINVAL;
2730 }
2731 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2732 return JNI_EINVAL;
2733 }
2734 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2735 uint max_tenuring_thresh = 0;
2736 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2737 jio_fprintf(defaultStream::error_stream(),
2738 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2739 return JNI_EINVAL;
2740 }
2741
2742 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2743 return JNI_EINVAL;
2744 }
2745
2746 if (MaxTenuringThreshold == 0) {
2747 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2748 return JNI_EINVAL;
2749 }
2750 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2751 return JNI_EINVAL;
2752 }
2753 } else {
2754 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2755 return JNI_EINVAL;
2756 }
2757 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2758 return JNI_EINVAL;
2759 }
2760 }
2761 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2762 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2763 return JNI_EINVAL;
2764 }
2765 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2766 return JNI_EINVAL;
2767 }
2768 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2769 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2770 return JNI_EINVAL;
2771 }
2772 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2773 return JNI_EINVAL;
2774 }
2775 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2776 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2777 return JNI_EINVAL;
2778 }
2779 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2780 return JNI_EINVAL;
2781 }
2782 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2783 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2784 return JNI_EINVAL;
2785 }
2786 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2787 return JNI_EINVAL;
2788 }
2789 } else if (match_option(option, "--finalization=", &tail)) {
2790 if (strcmp(tail, "enabled") == 0) {
2791 InstanceKlass::set_finalization_enabled(true);
2792 } else if (strcmp(tail, "disabled") == 0) {
2793 InstanceKlass::set_finalization_enabled(false);
2794 } else {
2795 jio_fprintf(defaultStream::error_stream(),
2796 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2797 tail);
2798 return JNI_EINVAL;
2799 }
2800 #if !defined(DTRACE_ENABLED)
2801 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2802 jio_fprintf(defaultStream::error_stream(),
2803 "DTraceMethodProbes flag is not applicable for this configuration\n");
2804 return JNI_EINVAL;
2805 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2806 jio_fprintf(defaultStream::error_stream(),
2807 "DTraceAllocProbes flag is not applicable for this configuration\n");
2808 return JNI_EINVAL;
2809 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2810 jio_fprintf(defaultStream::error_stream(),
2811 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2812 return JNI_EINVAL;
2813 #endif // !defined(DTRACE_ENABLED)
2814 #ifdef ASSERT
2815 } else if (match_option(option, "-XX:+FullGCALot")) {
2816 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2817 return JNI_EINVAL;
2818 }
2819 #endif
2820 #if !INCLUDE_MANAGEMENT
2821 } else if (match_option(option, "-XX:+ManagementServer")) {
2822 jio_fprintf(defaultStream::error_stream(),
2823 "ManagementServer is not supported in this VM.\n");
2824 return JNI_ERR;
2825 #endif // INCLUDE_MANAGEMENT
2826 #if INCLUDE_JVMCI
2827 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2828 if (EnableJVMCIProduct) {
2829 jio_fprintf(defaultStream::error_stream(),
2830 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2831 return JNI_EINVAL;
2832 }
2833 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2834 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2835 if (use_graal_jit) {
2836 const char* jvmci_compiler = get_property("jvmci.Compiler");
2837 if (jvmci_compiler != nullptr) {
2838 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2839 jio_fprintf(defaultStream::error_stream(),
2840 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2841 return JNI_ERR;
2842 }
2843 } else if (!add_property("jvmci.Compiler=graal")) {
2844 return JNI_ENOMEM;
2845 }
2846 }
2847
2848 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2849 if (EnableJVMCIProduct) {
2850 continue;
2851 }
2852 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2853 // Allow this flag if it has been unlocked.
2854 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2855 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2856 jio_fprintf(defaultStream::error_stream(),
2857 "Unable to enable JVMCI in product mode\n");
2858 return JNI_ERR;
2859 }
2860 }
2861 // The flag was locked so process normally to report that error
2862 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2863 return JNI_EINVAL;
2864 }
2865 #endif // INCLUDE_JVMCI
2866 #if INCLUDE_JFR
2867 } else if (match_jfr_option(&option)) {
2868 return JNI_EINVAL;
2869 #endif
2870 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2871 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2872 // already been handled
2873 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2874 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2875 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2876 return JNI_EINVAL;
2877 }
2878 }
2879 // Unknown option
2880 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2881 return JNI_ERR;
2882 }
2883 }
2884
2885 // PrintSharedArchiveAndExit will turn on
2886 // -Xshare:on
2887 // -Xlog:class+path=info
2888 if (PrintSharedArchiveAndExit) {
2889 UseSharedSpaces = true;
2890 RequireSharedSpaces = true;
2891 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2892 }
2893
2894 fix_appclasspath();
2895
2896 return JNI_OK;
2897 }
2898
2899 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool allow_append, bool allow_cds) {
2900 if (!allow_cds) {
2901 CDSConfig::set_module_patching_disables_cds();
2902 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2903 CDSConfig::set_java_base_module_patching_disables_cds();
2904 }
2905 }
2906
2907 // Create GrowableArray lazily, only if --patch-module has been specified
2908 if (_patch_mod_prefix == nullptr) {
2909 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2910 }
2911
2912 // Scan patches for matching module
2913 int i = _patch_mod_prefix->find_if([&](ModulePatchPath* patch) {
2914 return (strcmp(module_name, patch->module_name()) == 0);
2915 });
2916 if (i == -1) {
2917 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2918 } else {
2919 if (allow_append) {
2920 // append path to existing module entry
2921 _patch_mod_prefix->at(i)->append_path(path);
2922 } else {
2923 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2924 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2925 } else {
2926 vm_exit_during_initialization("Cannot specify a module more than once to --patch-module", module_name);
2927 }
2928 }
2929 }
2930 }
2931
2932 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2933 //
2934 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2935 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2936 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2937 // path is treated as the current directory.
2938 //
2939 // This causes problems with CDS, which requires that all directories specified in the classpath
2940 // must be empty. In most cases, applications do NOT want to load classes from the current
2941 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2942 // scripts compatible with CDS.
2943 void Arguments::fix_appclasspath() {
2944 if (IgnoreEmptyClassPaths) {
2945 const char separator = *os::path_separator();
2946 const char* src = _java_class_path->value();
2947
2948 // skip over all the leading empty paths
2949 while (*src == separator) {
2950 src ++;
2951 }
2952
2953 char* copy = os::strdup_check_oom(src, mtArguments);
2954
2955 // trim all trailing empty paths
2956 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2957 *tail = '\0';
2958 }
2959
2960 char from[3] = {separator, separator, '\0'};
2961 char to [2] = {separator, '\0'};
2962 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2963 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2964 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2965 }
2966
2967 _java_class_path->set_writeable_value(copy);
2968 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2969 }
2970 }
2971
2972 jint Arguments::finalize_vm_init_args() {
2973 // check if the default lib/endorsed directory exists; if so, error
2974 char path[JVM_MAXPATHLEN];
2975 const char* fileSep = os::file_separator();
2976 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2977
2978 DIR* dir = os::opendir(path);
2979 if (dir != nullptr) {
2980 jio_fprintf(defaultStream::output_stream(),
2981 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2982 "in modular form will be supported via the concept of upgradeable modules.\n");
2983 os::closedir(dir);
2984 return JNI_ERR;
2985 }
2986
2987 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2988 dir = os::opendir(path);
2989 if (dir != nullptr) {
2990 jio_fprintf(defaultStream::output_stream(),
2991 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2992 "Use -classpath instead.\n.");
2993 os::closedir(dir);
2994 return JNI_ERR;
2995 }
2996
2997 // This must be done after all arguments have been processed
2998 // and the container support has been initialized since AggressiveHeap
2999 // relies on the amount of total memory available.
3000 if (AggressiveHeap) {
3001 jint result = set_aggressive_heap_flags();
3002 if (result != JNI_OK) {
3003 return result;
3004 }
3005 }
3006
3007 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3008 // but like -Xint, leave compilation thresholds unaffected.
3009 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3010 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3011 set_mode_flags(_int);
3012 }
3013
3014 #ifdef ZERO
3015 // Zero always runs in interpreted mode
3016 set_mode_flags(_int);
3017 #endif
3018
3019 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3020 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3021 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3022 }
3023
3024 #if !COMPILER2_OR_JVMCI
3025 // Don't degrade server performance for footprint
3026 if (FLAG_IS_DEFAULT(UseLargePages) &&
3027 MaxHeapSize < LargePageHeapSizeThreshold) {
3028 // No need for large granularity pages w/small heaps.
3029 // Note that large pages are enabled/disabled for both the
3030 // Java heap and the code cache.
3031 FLAG_SET_DEFAULT(UseLargePages, false);
3032 }
3033
3034 UNSUPPORTED_OPTION(ProfileInterpreter);
3035 #endif
3036
3037 // Parse the CompilationMode flag
3038 if (!CompilationModeFlag::initialize()) {
3039 return JNI_ERR;
3040 }
3041
3042 if (!check_vm_args_consistency()) {
3043 return JNI_ERR;
3044 }
3045
3046 // finalize --module-patch and related --enable-preview
3047 if (finalize_patch_module() != JNI_OK) {
3048 return JNI_ERR;
3049 }
3050
3051 if (!CDSConfig::check_vm_args_consistency(mode_flag_cmd_line)) {
3052 return JNI_ERR;
3053 }
3054
3055 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3056 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3057 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3058
3059 return JNI_OK;
3060 }
3061
3062 // Helper class for controlling the lifetime of JavaVMInitArgs
3063 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3064 // deleted on the destruction of the ScopedVMInitArgs object.
3065 class ScopedVMInitArgs : public StackObj {
3066 private:
3067 JavaVMInitArgs _args;
3068 char* _container_name;
3069 bool _is_set;
3070 char* _vm_options_file_arg;
3071
3072 public:
3073 ScopedVMInitArgs(const char *container_name) {
3074 _args.version = JNI_VERSION_1_2;
3075 _args.nOptions = 0;
3076 _args.options = nullptr;
3077 _args.ignoreUnrecognized = false;
3078 _container_name = (char *)container_name;
3079 _is_set = false;
3080 _vm_options_file_arg = nullptr;
3081 }
3082
3083 // Populates the JavaVMInitArgs object represented by this
3084 // ScopedVMInitArgs object with the arguments in options. The
3085 // allocated memory is deleted by the destructor. If this method
3086 // returns anything other than JNI_OK, then this object is in a
3087 // partially constructed state, and should be abandoned.
3088 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3089 _is_set = true;
3090 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3091 JavaVMOption, options->length(), mtArguments);
3092 if (options_arr == nullptr) {
3093 return JNI_ENOMEM;
3094 }
3095 _args.options = options_arr;
3096
3097 for (int i = 0; i < options->length(); i++) {
3098 options_arr[i] = options->at(i);
3099 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3100 if (options_arr[i].optionString == nullptr) {
3101 // Rely on the destructor to do cleanup.
3102 _args.nOptions = i;
3103 return JNI_ENOMEM;
3104 }
3105 }
3106
3107 _args.nOptions = options->length();
3108 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3109 return JNI_OK;
3110 }
3111
3112 JavaVMInitArgs* get() { return &_args; }
3113 char* container_name() { return _container_name; }
3114 bool is_set() { return _is_set; }
3115 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3116 char* vm_options_file_arg() { return _vm_options_file_arg; }
3117
3118 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3119 if (_vm_options_file_arg != nullptr) {
3120 os::free(_vm_options_file_arg);
3121 }
3122 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3123 }
3124
3125 ~ScopedVMInitArgs() {
3126 if (_vm_options_file_arg != nullptr) {
3127 os::free(_vm_options_file_arg);
3128 }
3129 if (_args.options == nullptr) return;
3130 for (int i = 0; i < _args.nOptions; i++) {
3131 os::free(_args.options[i].optionString);
3132 }
3133 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3134 }
3135
3136 // Insert options into this option list, to replace option at
3137 // vm_options_file_pos (-XX:VMOptionsFile)
3138 jint insert(const JavaVMInitArgs* args,
3139 const JavaVMInitArgs* args_to_insert,
3140 const int vm_options_file_pos) {
3141 assert(_args.options == nullptr, "shouldn't be set yet");
3142 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3143 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3144
3145 int length = args->nOptions + args_to_insert->nOptions - 1;
3146 // Construct new option array
3147 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3148 for (int i = 0; i < args->nOptions; i++) {
3149 if (i == vm_options_file_pos) {
3150 // insert the new options starting at the same place as the
3151 // -XX:VMOptionsFile option
3152 for (int j = 0; j < args_to_insert->nOptions; j++) {
3153 options.push(args_to_insert->options[j]);
3154 }
3155 } else {
3156 options.push(args->options[i]);
3157 }
3158 }
3159 // make into options array
3160 return set_args(&options);
3161 }
3162 };
3163
3164 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3165 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3166 }
3167
3168 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3169 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3170 }
3171
3172 jint Arguments::parse_options_environment_variable(const char* name,
3173 ScopedVMInitArgs* vm_args) {
3174 char *buffer = ::getenv(name);
3175
3176 // Don't check this environment variable if user has special privileges
3177 // (e.g. unix su command).
3178 if (buffer == nullptr || os::have_special_privileges()) {
3179 return JNI_OK;
3180 }
3181
3182 if ((buffer = os::strdup(buffer)) == nullptr) {
3183 return JNI_ENOMEM;
3184 }
3185
3186 jio_fprintf(defaultStream::error_stream(),
3187 "Picked up %s: %s\n", name, buffer);
3188
3189 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3190
3191 os::free(buffer);
3192 return retcode;
3193 }
3194
3195 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3196 // read file into buffer
3197 int fd = ::open(file_name, O_RDONLY);
3198 if (fd < 0) {
3199 jio_fprintf(defaultStream::error_stream(),
3200 "Could not open options file '%s'\n",
3201 file_name);
3202 return JNI_ERR;
3203 }
3204
3205 struct stat stbuf;
3206 int retcode = os::stat(file_name, &stbuf);
3207 if (retcode != 0) {
3208 jio_fprintf(defaultStream::error_stream(),
3209 "Could not stat options file '%s'\n",
3210 file_name);
3211 ::close(fd);
3212 return JNI_ERR;
3213 }
3214
3215 if (stbuf.st_size == 0) {
3216 // tell caller there is no option data and that is ok
3217 ::close(fd);
3218 return JNI_OK;
3219 }
3220
3221 // '+ 1' for null termination even with max bytes
3222 size_t bytes_alloc = stbuf.st_size + 1;
3223
3224 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3225 if (nullptr == buf) {
3226 jio_fprintf(defaultStream::error_stream(),
3227 "Could not allocate read buffer for options file parse\n");
3228 ::close(fd);
3229 return JNI_ENOMEM;
3230 }
3231
3232 memset(buf, 0, bytes_alloc);
3233
3234 // Fill buffer
3235 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3236 ::close(fd);
3237 if (bytes_read < 0) {
3238 FREE_C_HEAP_ARRAY(char, buf);
3239 jio_fprintf(defaultStream::error_stream(),
3240 "Could not read options file '%s'\n", file_name);
3241 return JNI_ERR;
3242 }
3243
3244 if (bytes_read == 0) {
3245 // tell caller there is no option data and that is ok
3246 FREE_C_HEAP_ARRAY(char, buf);
3247 return JNI_OK;
3248 }
3249
3250 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3251
3252 FREE_C_HEAP_ARRAY(char, buf);
3253 return retcode;
3254 }
3255
3256 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3257 // Construct option array
3258 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3259
3260 // some pointers to help with parsing
3261 char *buffer_end = buffer + buf_len;
3262 char *opt_hd = buffer;
3263 char *wrt = buffer;
3264 char *rd = buffer;
3265
3266 // parse all options
3267 while (rd < buffer_end) {
3268 // skip leading white space from the input string
3269 while (rd < buffer_end && isspace(*rd)) {
3270 rd++;
3271 }
3272
3273 if (rd >= buffer_end) {
3274 break;
3275 }
3276
3277 // Remember this is where we found the head of the token.
3278 opt_hd = wrt;
3279
3280 // Tokens are strings of non white space characters separated
3281 // by one or more white spaces.
3282 while (rd < buffer_end && !isspace(*rd)) {
3283 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3284 int quote = *rd; // matching quote to look for
3285 rd++; // don't copy open quote
3286 while (rd < buffer_end && *rd != quote) {
3287 // include everything (even spaces)
3288 // up until the close quote
3289 *wrt++ = *rd++; // copy to option string
3290 }
3291
3292 if (rd < buffer_end) {
3293 rd++; // don't copy close quote
3294 } else {
3295 // did not see closing quote
3296 jio_fprintf(defaultStream::error_stream(),
3297 "Unmatched quote in %s\n", name);
3298 return JNI_ERR;
3299 }
3300 } else {
3301 *wrt++ = *rd++; // copy to option string
3302 }
3303 }
3304
3305 // steal a white space character and set it to null
3306 *wrt++ = '\0';
3307 // We now have a complete token
3308
3309 JavaVMOption option;
3310 option.optionString = opt_hd;
3311 option.extraInfo = nullptr;
3312
3313 options.append(option); // Fill in option
3314
3315 rd++; // Advance to next character
3316 }
3317
3318 // Fill out JavaVMInitArgs structure.
3319 return vm_args->set_args(&options);
3320 }
3321
3322 #ifndef PRODUCT
3323 // Determine whether LogVMOutput should be implicitly turned on.
3324 static bool use_vm_log() {
3325 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3326 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3327 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3328 PrintAssembly || TraceDeoptimization ||
3329 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3330 return true;
3331 }
3332
3333 #ifdef COMPILER1
3334 if (PrintC1Statistics) {
3335 return true;
3336 }
3337 #endif // COMPILER1
3338
3339 #ifdef COMPILER2
3340 if (PrintOptoAssembly || PrintOptoStatistics) {
3341 return true;
3342 }
3343 #endif // COMPILER2
3344
3345 return false;
3346 }
3347
3348 #endif // PRODUCT
3349
3350 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3351 for (int index = 0; index < args->nOptions; index++) {
3352 const JavaVMOption* option = args->options + index;
3353 const char* tail;
3354 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3355 return true;
3356 }
3357 }
3358 return false;
3359 }
3360
3361 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3362 const char* vm_options_file,
3363 const int vm_options_file_pos,
3364 ScopedVMInitArgs* vm_options_file_args,
3365 ScopedVMInitArgs* args_out) {
3366 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3367 if (code != JNI_OK) {
3368 return code;
3369 }
3370
3371 if (vm_options_file_args->get()->nOptions < 1) {
3372 return JNI_OK;
3373 }
3374
3375 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3376 jio_fprintf(defaultStream::error_stream(),
3377 "A VM options file may not refer to a VM options file. "
3378 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3379 "options file '%s' in options container '%s' is an error.\n",
3380 vm_options_file_args->vm_options_file_arg(),
3381 vm_options_file_args->container_name());
3382 return JNI_EINVAL;
3383 }
3384
3385 return args_out->insert(args, vm_options_file_args->get(),
3386 vm_options_file_pos);
3387 }
3388
3389 // Expand -XX:VMOptionsFile found in args_in as needed.
3390 // mod_args and args_out parameters may return values as needed.
3391 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3392 ScopedVMInitArgs* mod_args,
3393 JavaVMInitArgs** args_out) {
3394 jint code = match_special_option_and_act(args_in, mod_args);
3395 if (code != JNI_OK) {
3396 return code;
3397 }
3398
3399 if (mod_args->is_set()) {
3400 // args_in contains -XX:VMOptionsFile and mod_args contains the
3401 // original options from args_in along with the options expanded
3402 // from the VMOptionsFile. Return a short-hand to the caller.
3403 *args_out = mod_args->get();
3404 } else {
3405 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3406 }
3407 return JNI_OK;
3408 }
3409
3410 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3411 ScopedVMInitArgs* args_out) {
3412 // Remaining part of option string
3413 const char* tail;
3414 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3415
3416 for (int index = 0; index < args->nOptions; index++) {
3417 const JavaVMOption* option = args->options + index;
3418 if (match_option(option, "-XX:Flags=", &tail)) {
3419 Arguments::set_jvm_flags_file(tail);
3420 continue;
3421 }
3422 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3423 if (vm_options_file_args.found_vm_options_file_arg()) {
3424 jio_fprintf(defaultStream::error_stream(),
3425 "The option '%s' is already specified in the options "
3426 "container '%s' so the specification of '%s' in the "
3427 "same options container is an error.\n",
3428 vm_options_file_args.vm_options_file_arg(),
3429 vm_options_file_args.container_name(),
3430 option->optionString);
3431 return JNI_EINVAL;
3432 }
3433 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3434 // If there's a VMOptionsFile, parse that
3435 jint code = insert_vm_options_file(args, tail, index,
3436 &vm_options_file_args, args_out);
3437 if (code != JNI_OK) {
3438 return code;
3439 }
3440 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3441 if (args_out->is_set()) {
3442 // The VMOptions file inserted some options so switch 'args'
3443 // to the new set of options, and continue processing which
3444 // preserves "last option wins" semantics.
3445 args = args_out->get();
3446 // The first option from the VMOptionsFile replaces the
3447 // current option. So we back track to process the
3448 // replacement option.
3449 index--;
3450 }
3451 continue;
3452 }
3453 if (match_option(option, "-XX:+PrintVMOptions")) {
3454 PrintVMOptions = true;
3455 continue;
3456 }
3457 if (match_option(option, "-XX:-PrintVMOptions")) {
3458 PrintVMOptions = false;
3459 continue;
3460 }
3461 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3462 IgnoreUnrecognizedVMOptions = true;
3463 continue;
3464 }
3465 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3466 IgnoreUnrecognizedVMOptions = false;
3467 continue;
3468 }
3469 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3470 JVMFlag::printFlags(tty, false);
3471 vm_exit(0);
3472 }
3473
3474 #ifndef PRODUCT
3475 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3476 JVMFlag::printFlags(tty, true);
3477 vm_exit(0);
3478 }
3479 #endif
3480 }
3481 return JNI_OK;
3482 }
3483
3484 static void print_options(const JavaVMInitArgs *args) {
3485 const char* tail;
3486 for (int index = 0; index < args->nOptions; index++) {
3487 const JavaVMOption *option = args->options + index;
3488 if (match_option(option, "-XX:", &tail)) {
3489 logOption(tail);
3490 }
3491 }
3492 }
3493
3494 bool Arguments::handle_deprecated_print_gc_flags() {
3495 if (PrintGC) {
3496 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3497 }
3498 if (PrintGCDetails) {
3499 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3500 }
3501
3502 if (_legacyGCLogging.lastFlag == 2) {
3503 // -Xloggc was used to specify a filename
3504 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3505
3506 LogTarget(Error, logging) target;
3507 LogStream errstream(target);
3508 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3509 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3510 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3511 }
3512 return true;
3513 }
3514
3515 static void apply_debugger_ergo() {
3516 #ifdef ASSERT
3517 if (ReplayCompiles) {
3518 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3519 }
3520
3521 if (UseDebuggerErgo) {
3522 // Turn on sub-flags
3523 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3524 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3525 }
3526
3527 if (UseDebuggerErgo2) {
3528 // Debugging with limited number of CPUs
3529 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3530 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3531 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3532 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3533 }
3534 #endif // ASSERT
3535 }
3536
3537 // Parse entry point called from JNI_CreateJavaVM
3538
3539 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3540 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3541 JVMFlag::check_all_flag_declarations();
3542
3543 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3544 const char* hotspotrc = ".hotspotrc";
3545 bool settings_file_specified = false;
3546 bool needs_hotspotrc_warning = false;
3547 ScopedVMInitArgs initial_vm_options_args("");
3548 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3549 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3550
3551 // Pointers to current working set of containers
3552 JavaVMInitArgs* cur_cmd_args;
3553 JavaVMInitArgs* cur_vm_options_args;
3554 JavaVMInitArgs* cur_java_options_args;
3555 JavaVMInitArgs* cur_java_tool_options_args;
3556
3557 // Containers for modified/expanded options
3558 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3559 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3560 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3561 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3562
3563
3564 jint code =
3565 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3566 if (code != JNI_OK) {
3567 return code;
3568 }
3569
3570 code = parse_java_options_environment_variable(&initial_java_options_args);
3571 if (code != JNI_OK) {
3572 return code;
3573 }
3574
3575 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3576 char *vmoptions = ClassLoader::lookup_vm_options();
3577 if (vmoptions != nullptr) {
3578 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3579 FREE_C_HEAP_ARRAY(char, vmoptions);
3580 if (code != JNI_OK) {
3581 return code;
3582 }
3583 }
3584
3585 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3586 &mod_java_tool_options_args,
3587 &cur_java_tool_options_args);
3588 if (code != JNI_OK) {
3589 return code;
3590 }
3591
3592 code = expand_vm_options_as_needed(initial_cmd_args,
3593 &mod_cmd_args,
3594 &cur_cmd_args);
3595 if (code != JNI_OK) {
3596 return code;
3597 }
3598
3599 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3600 &mod_java_options_args,
3601 &cur_java_options_args);
3602 if (code != JNI_OK) {
3603 return code;
3604 }
3605
3606 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3607 &mod_vm_options_args,
3608 &cur_vm_options_args);
3609 if (code != JNI_OK) {
3610 return code;
3611 }
3612
3613 const char* flags_file = Arguments::get_jvm_flags_file();
3614 settings_file_specified = (flags_file != nullptr);
3615
3616 if (IgnoreUnrecognizedVMOptions) {
3617 cur_cmd_args->ignoreUnrecognized = true;
3618 cur_java_tool_options_args->ignoreUnrecognized = true;
3619 cur_java_options_args->ignoreUnrecognized = true;
3620 }
3621
3622 // Parse specified settings file
3623 if (settings_file_specified) {
3624 if (!process_settings_file(flags_file, true,
3625 cur_cmd_args->ignoreUnrecognized)) {
3626 return JNI_EINVAL;
3627 }
3628 } else {
3629 #ifdef ASSERT
3630 // Parse default .hotspotrc settings file
3631 if (!process_settings_file(".hotspotrc", false,
3632 cur_cmd_args->ignoreUnrecognized)) {
3633 return JNI_EINVAL;
3634 }
3635 #else
3636 struct stat buf;
3637 if (os::stat(hotspotrc, &buf) == 0) {
3638 needs_hotspotrc_warning = true;
3639 }
3640 #endif
3641 }
3642
3643 if (PrintVMOptions) {
3644 print_options(cur_java_tool_options_args);
3645 print_options(cur_cmd_args);
3646 print_options(cur_java_options_args);
3647 }
3648
3649 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3650 jint result = parse_vm_init_args(cur_vm_options_args,
3651 cur_java_tool_options_args,
3652 cur_java_options_args,
3653 cur_cmd_args);
3654
3655 if (result != JNI_OK) {
3656 return result;
3657 }
3658
3659 // Delay warning until here so that we've had a chance to process
3660 // the -XX:-PrintWarnings flag
3661 if (needs_hotspotrc_warning) {
3662 warning("%s file is present but has been ignored. "
3663 "Run with -XX:Flags=%s to load the file.",
3664 hotspotrc, hotspotrc);
3665 }
3666
3667 if (needs_module_property_warning) {
3668 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3669 " names that are reserved for internal use.");
3670 }
3671
3672 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3673 UNSUPPORTED_OPTION(UseLargePages);
3674 #endif
3675
3676 #if defined(AIX)
3677 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3678 #endif
3679
3680 #ifndef PRODUCT
3681 if (TraceBytecodesAt != 0) {
3682 TraceBytecodes = true;
3683 }
3684 #endif // PRODUCT
3685
3686 if (ScavengeRootsInCode == 0) {
3687 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3688 warning("Forcing ScavengeRootsInCode non-zero");
3689 }
3690 ScavengeRootsInCode = 1;
3691 }
3692
3693 if (!handle_deprecated_print_gc_flags()) {
3694 return JNI_EINVAL;
3695 }
3696
3697 // Set object alignment values.
3698 set_object_alignment();
3699
3700 #if !INCLUDE_CDS
3701 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3702 jio_fprintf(defaultStream::error_stream(),
3703 "Shared spaces are not supported in this VM\n");
3704 return JNI_ERR;
3705 }
3706 if (DumpLoadedClassList != nullptr) {
3707 jio_fprintf(defaultStream::error_stream(),
3708 "DumpLoadedClassList is not supported in this VM\n");
3709 return JNI_ERR;
3710 }
3711 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3712 log_is_enabled(Info, cds)) {
3713 warning("Shared spaces are not supported in this VM");
3714 UseSharedSpaces = false;
3715 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3716 }
3717 no_shared_spaces("CDS Disabled");
3718 #endif // INCLUDE_CDS
3719
3720 // Verify NMT arguments
3721 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3722 if (lvl == NMT_unknown) {
3723 jio_fprintf(defaultStream::error_stream(),
3724 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3725 return JNI_ERR;
3726 }
3727 if (PrintNMTStatistics && lvl == NMT_off) {
3728 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3729 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3730 }
3731
3732 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3733 if (trace_dependencies && VerifyDependencies) {
3734 warning("dependency logging results may be inflated by VerifyDependencies");
3735 }
3736
3737 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3738 log_is_enabled(Info, class, load, cause);
3739 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3740 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3741 }
3742
3743 apply_debugger_ergo();
3744
3745 // The VMThread needs to stop now and then to execute these debug options.
3746 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3747 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3748 }
3749
3750 if (log_is_enabled(Info, arguments)) {
3751 LogStream st(Log(arguments)::info());
3752 Arguments::print_on(&st);
3753 }
3754
3755 return JNI_OK;
3756 }
3757
3758 jint Arguments::apply_ergo() {
3759 // Set flags based on ergonomics.
3760 jint result = set_ergonomics_flags();
3761 if (result != JNI_OK) return result;
3762
3763 // Set heap size based on available physical memory
3764 set_heap_size();
3765
3766 GCConfig::arguments()->initialize();
3767
3768 CDSConfig::initialize();
3769
3770 // Initialize Metaspace flags and alignments
3771 Metaspace::ergo_initialize();
3772
3773 if (!StringDedup::ergo_initialize()) {
3774 return JNI_EINVAL;
3775 }
3776
3777 // Set compiler flags after GC is selected and GC specific
3778 // flags (LoopStripMiningIter) are set.
3779 CompilerConfig::ergo_initialize();
3780
3781 // Set bytecode rewriting flags
3782 set_bytecode_flags();
3783
3784 // Set flags if aggressive optimization flags are enabled
3785 jint code = set_aggressive_opts_flags();
3786 if (code != JNI_OK) {
3787 return code;
3788 }
3789
3790 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3791 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3792 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3793 warning("UseSecondarySupersTable is not supported");
3794 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3795 }
3796 if (!UseSecondarySupersTable) {
3797 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3798 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3799 }
3800
3801 #ifdef ZERO
3802 // Clear flags not supported on zero.
3803 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3804 #endif // ZERO
3805
3806 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3807 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3808 DebugNonSafepoints = true;
3809 }
3810
3811 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3812 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3813 }
3814
3815 // Treat the odd case where local verification is enabled but remote
3816 // verification is not as if both were enabled.
3817 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3818 log_info(verification)("Turning on remote verification because local verification is on");
3819 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3820 }
3821 if (!EnableValhalla || (is_interpreter_only() && !CDSConfig::is_dumping_archive() && !UseSharedSpaces)) {
3822 // Disable calling convention optimizations if inline types are not supported.
3823 // Also these aren't useful in -Xint. However, don't disable them when dumping or using
3824 // the CDS archive, as the values must match between dumptime and runtime.
3825 InlineTypePassFieldsAsArgs = false;
3826 InlineTypeReturnedAsFields = false;
3827 }
3828
3829 #ifndef PRODUCT
3830 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3831 if (use_vm_log()) {
3832 LogVMOutput = true;
3833 }
3834 }
3835 #endif // PRODUCT
3836
3837 if (PrintCommandLineFlags) {
3838 JVMFlag::printSetFlags(tty);
3839 }
3840
3841 #if COMPILER2_OR_JVMCI
3842 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3843 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3844 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3845 }
3846 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3847
3848 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3849 if (!EnableVectorReboxing) {
3850 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3851 } else {
3852 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3853 }
3854 }
3855 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3856
3857 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
3858 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
3859 }
3860 FLAG_SET_DEFAULT(UseVectorStubs, false);
3861 }
3862 #endif // COMPILER2_OR_JVMCI
3863
3864 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3865 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3866 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3867 }
3868 }
3869 return JNI_OK;
3870 }
3871
3872 jint Arguments::adjust_after_os() {
3873 if (UseNUMA) {
3874 if (UseParallelGC) {
3875 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3876 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3877 }
3878 }
3879 }
3880 return JNI_OK;
3881 }
3882
3883 int Arguments::PropertyList_count(SystemProperty* pl) {
3884 int count = 0;
3885 while(pl != nullptr) {
3886 count++;
3887 pl = pl->next();
3888 }
3889 return count;
3890 }
3891
3892 // Return the number of readable properties.
3893 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3894 int count = 0;
3895 while(pl != nullptr) {
3896 if (pl->readable()) {
3897 count++;
3898 }
3899 pl = pl->next();
3900 }
3901 return count;
3902 }
3903
3904 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3905 assert(key != nullptr, "just checking");
3906 SystemProperty* prop;
3907 for (prop = pl; prop != nullptr; prop = prop->next()) {
3908 if (strcmp(key, prop->key()) == 0) return prop->value();
3909 }
3910 return nullptr;
3911 }
3912
3913 // Return the value of the requested property provided that it is a readable property.
3914 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3915 assert(key != nullptr, "just checking");
3916 SystemProperty* prop;
3917 // Return the property value if the keys match and the property is not internal or
3918 // it's the special internal property "jdk.boot.class.path.append".
3919 for (prop = pl; prop != nullptr; prop = prop->next()) {
3920 if (strcmp(key, prop->key()) == 0) {
3921 if (!prop->internal()) {
3922 return prop->value();
3923 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3924 return prop->value();
3925 } else {
3926 // Property is internal and not jdk.boot.class.path.append so return null.
3927 return nullptr;
3928 }
3929 }
3930 }
3931 return nullptr;
3932 }
3933
3934 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3935 SystemProperty* p = *plist;
3936 if (p == nullptr) {
3937 *plist = new_p;
3938 } else {
3939 while (p->next() != nullptr) {
3940 p = p->next();
3941 }
3942 p->set_next(new_p);
3943 }
3944 }
3945
3946 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3947 bool writeable, bool internal) {
3948 if (plist == nullptr)
3949 return;
3950
3951 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3952 PropertyList_add(plist, new_p);
3953 }
3954
3955 void Arguments::PropertyList_add(SystemProperty *element) {
3956 PropertyList_add(&_system_properties, element);
3957 }
3958
3959 // This add maintains unique property key in the list.
3960 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3961 PropertyAppendable append, PropertyWriteable writeable,
3962 PropertyInternal internal) {
3963 if (plist == nullptr)
3964 return;
3965
3966 // If property key exists and is writeable, then update with new value.
3967 // Trying to update a non-writeable property is silently ignored.
3968 SystemProperty* prop;
3969 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3970 if (strcmp(k, prop->key()) == 0) {
3971 if (append == AppendProperty) {
3972 prop->append_writeable_value(v);
3973 } else {
3974 prop->set_writeable_value(v);
3975 }
3976 return;
3977 }
3978 }
3979
3980 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3981 }
3982
3983 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3984 // Returns true if all of the source pointed by src has been copied over to
3985 // the destination buffer pointed by buf. Otherwise, returns false.
3986 // Notes:
3987 // 1. If the length (buflen) of the destination buffer excluding the
3988 // null terminator character is not long enough for holding the expanded
3989 // pid characters, it also returns false instead of returning the partially
3990 // expanded one.
3991 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3992 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3993 char* buf, size_t buflen) {
3994 const char* p = src;
3995 char* b = buf;
3996 const char* src_end = &src[srclen];
3997 char* buf_end = &buf[buflen - 1];
3998
3999 while (p < src_end && b < buf_end) {
4000 if (*p == '%') {
4001 switch (*(++p)) {
4002 case '%': // "%%" ==> "%"
4003 *b++ = *p++;
4004 break;
4005 case 'p': { // "%p" ==> current process id
4006 // buf_end points to the character before the last character so
4007 // that we could write '\0' to the end of the buffer.
4008 size_t buf_sz = buf_end - b + 1;
4009 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4010
4011 // if jio_snprintf fails or the buffer is not long enough to hold
4012 // the expanded pid, returns false.
4013 if (ret < 0 || ret >= (int)buf_sz) {
4014 return false;
4015 } else {
4016 b += ret;
4017 assert(*b == '\0', "fail in copy_expand_pid");
4018 if (p == src_end && b == buf_end + 1) {
4019 // reach the end of the buffer.
4020 return true;
4021 }
4022 }
4023 p++;
4024 break;
4025 }
4026 default :
4027 *b++ = '%';
4028 }
4029 } else {
4030 *b++ = *p++;
4031 }
4032 }
4033 *b = '\0';
4034 return (p == src_end); // return false if not all of the source was copied
4035 }