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
78 static const char _default_java_launcher[] = "generic";
79
80 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
81
82 char* Arguments::_jvm_flags_file = nullptr;
83 char** Arguments::_jvm_flags_array = nullptr;
84 int Arguments::_num_jvm_flags = 0;
85 char** Arguments::_jvm_args_array = nullptr;
86 int Arguments::_num_jvm_args = 0;
87 char* Arguments::_java_command = nullptr;
88 SystemProperty* Arguments::_system_properties = nullptr;
89 size_t Arguments::_conservative_max_heap_alignment = 0;
90 Arguments::Mode Arguments::_mode = _mixed;
91 const char* Arguments::_java_vendor_url_bug = nullptr;
92 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
93 bool Arguments::_sun_java_launcher_is_altjvm = false;
94
95 // These parameters are reset in method parse_vm_init_args()
96 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
97 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
98 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
99 bool Arguments::_ClipInlining = ClipInlining;
100 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
101
102 bool Arguments::_enable_preview = false;
103
104 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 };
105
106 // These are not set by the JDK's built-in launchers, but they can be set by
107 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
108 // JavaVMOption in jni.h.
109 abort_hook_t Arguments::_abort_hook = nullptr;
110 exit_hook_t Arguments::_exit_hook = nullptr;
111 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
112
113
114 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
115 SystemProperty *Arguments::_java_library_path = nullptr;
116 SystemProperty *Arguments::_java_home = nullptr;
117 SystemProperty *Arguments::_java_class_path = nullptr;
118 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
119 SystemProperty *Arguments::_vm_info = nullptr;
120
121 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
122 PathString *Arguments::_boot_class_path = nullptr;
123 bool Arguments::_has_jimage = false;
124
125 char* Arguments::_ext_dirs = nullptr;
126
127 // True if -Xshare:auto option was specified.
128 static bool xshare_auto_cmd_line = false;
129
130 // True if -Xint/-Xmixed/-Xcomp were specified
131 static bool mode_flag_cmd_line = false;
132
133 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
134 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
135 if (new_value == nullptr) {
136 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
137 return false;
138 }
139 if (_value != nullptr) {
140 FreeHeap(_value);
141 }
142 _value = new_value;
143 strcpy(_value, value);
144 return true;
145 }
146
147 void PathString::append_value(const char *value) {
148 char *sp;
149 size_t len = 0;
150 if (value != nullptr) {
151 len = strlen(value);
152 if (_value != nullptr) {
153 len += strlen(_value);
154 }
155 sp = AllocateHeap(len+2, mtArguments);
156 assert(sp != nullptr, "Unable to allocate space for new append path value");
157 if (sp != nullptr) {
158 if (_value != nullptr) {
159 strcpy(sp, _value);
160 strcat(sp, os::path_separator());
161 strcat(sp, value);
162 FreeHeap(_value);
163 } else {
164 strcpy(sp, value);
165 }
166 _value = sp;
167 }
168 }
169 }
170
171 PathString::PathString(const char* value) {
172 if (value == nullptr) {
173 _value = nullptr;
174 } else {
175 _value = AllocateHeap(strlen(value)+1, mtArguments);
176 strcpy(_value, value);
177 }
178 }
179
180 PathString::~PathString() {
181 if (_value != nullptr) {
182 FreeHeap(_value);
183 _value = nullptr;
184 }
185 }
186
187 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
188 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
189 size_t len = strlen(module_name) + 1;
190 _module_name = AllocateHeap(len, mtInternal);
191 strncpy(_module_name, module_name, len); // copy the trailing null
192 _path = new PathString(path);
193 }
194
195 ModulePatchPath::~ModulePatchPath() {
196 if (_module_name != nullptr) {
197 FreeHeap(_module_name);
198 _module_name = nullptr;
199 }
200 if (_path != nullptr) {
201 delete _path;
202 _path = nullptr;
203 }
204 }
205
206 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
207 if (key == nullptr) {
208 _key = nullptr;
209 } else {
210 _key = AllocateHeap(strlen(key)+1, mtArguments);
211 strcpy(_key, key);
212 }
213 _next = nullptr;
214 _internal = internal;
215 _writeable = writeable;
216 }
217
218 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
219 // part of the option string.
220 static bool match_option(const JavaVMOption *option, const char* name,
221 const char** tail) {
222 size_t len = strlen(name);
223 if (strncmp(option->optionString, name, len) == 0) {
224 *tail = option->optionString + len;
225 return true;
226 } else {
227 return false;
228 }
229 }
230
231 // Check if 'option' matches 'name'. No "tail" is allowed.
232 static bool match_option(const JavaVMOption *option, const char* name) {
233 const char* tail = nullptr;
234 bool result = match_option(option, name, &tail);
235 if (tail != nullptr && *tail == '\0') {
236 return result;
237 } else {
238 return false;
239 }
240 }
241
242 // Return true if any of the strings in null-terminated array 'names' matches.
243 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
244 // the option must match exactly.
245 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
246 bool tail_allowed) {
247 for (/* empty */; *names != nullptr; ++names) {
248 if (match_option(option, *names, tail)) {
249 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
250 return true;
251 }
252 }
253 }
254 return false;
255 }
256
257 #if INCLUDE_JFR
258 static bool _has_jfr_option = false; // is using JFR
259
260 // return true on failure
261 static bool match_jfr_option(const JavaVMOption** option) {
262 assert((*option)->optionString != nullptr, "invariant");
263 char* tail = nullptr;
264 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
265 _has_jfr_option = true;
266 return Jfr::on_start_flight_recording_option(option, tail);
267 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
268 _has_jfr_option = true;
269 return Jfr::on_flight_recorder_option(option, tail);
270 }
271 return false;
272 }
273
274 bool Arguments::has_jfr_option() {
275 return _has_jfr_option;
276 }
277 #endif
278
279 static void logOption(const char* opt) {
280 if (PrintVMOptions) {
281 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
282 }
283 }
284
285 bool needs_module_property_warning = false;
286
287 #define MODULE_PROPERTY_PREFIX "jdk.module."
288 #define MODULE_PROPERTY_PREFIX_LEN 11
289 #define ADDEXPORTS "addexports"
290 #define ADDEXPORTS_LEN 10
291 #define ADDREADS "addreads"
292 #define ADDREADS_LEN 8
293 #define ADDOPENS "addopens"
294 #define ADDOPENS_LEN 8
295 #define PATCH "patch"
296 #define PATCH_LEN 5
297 #define ADDMODS "addmods"
298 #define ADDMODS_LEN 7
299 #define LIMITMODS "limitmods"
300 #define LIMITMODS_LEN 9
301 #define PATH "path"
302 #define PATH_LEN 4
303 #define UPGRADE_PATH "upgrade.path"
304 #define UPGRADE_PATH_LEN 12
305 #define ENABLE_NATIVE_ACCESS "enable.native.access"
306 #define ENABLE_NATIVE_ACCESS_LEN 20
307
308 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
309 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
310 return ((strncmp(option, property, len) == 0) &&
311 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
312 }
313
314 // Return true if property starts with "jdk.module." and its ensuing chars match
315 // any of the reserved module properties.
316 // property should be passed without the leading "-D".
317 bool Arguments::is_internal_module_property(const char* property) {
318 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
319 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
320 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
321 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
322 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
323 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
324 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
325 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
326 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
327 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
328 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
329 return true;
330 }
331 }
332 return false;
333 }
334
335 // Process java launcher properties.
336 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
337 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
338 // Must do this before setting up other system properties,
339 // as some of them may depend on launcher type.
340 for (int index = 0; index < args->nOptions; index++) {
341 const JavaVMOption* option = args->options + index;
342 const char* tail;
343
344 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
345 process_java_launcher_argument(tail, option->extraInfo);
346 continue;
347 }
348 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
349 if (strcmp(tail, "true") == 0) {
350 _sun_java_launcher_is_altjvm = true;
351 }
352 continue;
353 }
354 }
355 }
356
357 // Initialize system properties key and value.
358 void Arguments::init_system_properties() {
359
360 // Set up _boot_class_path which is not a property but
361 // relies heavily on argument processing and the jdk.boot.class.path.append
362 // property. It is used to store the underlying boot class path.
363 _boot_class_path = new PathString(nullptr);
364
365 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
366 "Java Virtual Machine Specification", false));
367 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
368 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
369 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
370
371 // Initialize the vm.info now, but it will need updating after argument parsing.
372 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
373
374 // Following are JVMTI agent writable properties.
375 // Properties values are set to nullptr and they are
376 // os specific they are initialized in os::init_system_properties_values().
377 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
378 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
379 _java_home = new SystemProperty("java.home", nullptr, true);
380 _java_class_path = new SystemProperty("java.class.path", "", true);
381 // jdk.boot.class.path.append is a non-writeable, internal property.
382 // It can only be set by either:
383 // - -Xbootclasspath/a:
384 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
385 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
386
387 // Add to System Property list.
388 PropertyList_add(&_system_properties, _sun_boot_library_path);
389 PropertyList_add(&_system_properties, _java_library_path);
390 PropertyList_add(&_system_properties, _java_home);
391 PropertyList_add(&_system_properties, _java_class_path);
392 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
393 PropertyList_add(&_system_properties, _vm_info);
394
395 // Set OS specific system properties values
396 os::init_system_properties_values();
397 }
398
399 // Update/Initialize System properties after JDK version number is known
400 void Arguments::init_version_specific_system_properties() {
401 enum { bufsz = 16 };
402 char buffer[bufsz];
403 const char* spec_vendor = "Oracle Corporation";
404 uint32_t spec_version = JDK_Version::current().major_version();
405
406 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
407
408 PropertyList_add(&_system_properties,
409 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
410 PropertyList_add(&_system_properties,
411 new SystemProperty("java.vm.specification.version", buffer, false));
412 PropertyList_add(&_system_properties,
413 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
414 }
415
416 /*
417 * -XX argument processing:
418 *
419 * -XX arguments are defined in several places, such as:
420 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
421 * -XX arguments are parsed in parse_argument().
422 * -XX argument bounds checking is done in check_vm_args_consistency().
423 *
424 * Over time -XX arguments may change. There are mechanisms to handle common cases:
425 *
426 * ALIASED: An option that is simply another name for another option. This is often
427 * part of the process of deprecating a flag, but not all aliases need
428 * to be deprecated.
429 *
430 * Create an alias for an option by adding the old and new option names to the
431 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
432 *
433 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
434 * support may be removed in the future. Both regular and aliased options may be
435 * deprecated.
436 *
437 * Add a deprecation warning for an option (or alias) by adding an entry in the
438 * "special_jvm_flags" table and setting the "deprecated_in" field.
439 * Often an option "deprecated" in one major release will
440 * be made "obsolete" in the next. In this case the entry should also have its
441 * "obsolete_in" field set.
442 *
443 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
444 * on the command line. A warning is printed to let the user know that option might not
445 * be accepted in the future.
446 *
447 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
448 * table and setting the "obsolete_in" field.
449 *
450 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
451 * to the current JDK version. The system will flatly refuse to admit the existence of
452 * the flag. This allows a flag to die automatically over JDK releases.
453 *
454 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
455 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
456 * - Newly obsolete or expired deprecated options should have their global variable
457 * definitions removed (from globals.hpp, etc) and related implementations removed.
458 *
459 * Recommended approach for removing options:
460 *
461 * To remove options commonly used by customers (e.g. product -XX options), use
462 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
463 *
464 * To remove internal options (e.g. diagnostic, experimental, develop options), use
465 * a 2-step model adding major release numbers to the obsolete and expire columns.
466 *
467 * To change the name of an option, use the alias table as well as a 2-step
468 * model adding major release numbers to the deprecate and expire columns.
469 * Think twice about aliasing commonly used customer options.
470 *
471 * There are times when it is appropriate to leave a future release number as undefined.
472 *
473 * Tests: Aliases should be tested in VMAliasOptions.java.
474 * Deprecated options should be tested in VMDeprecatedOptions.java.
475 */
476
477 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
478 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
479 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
480 // the command-line as usual, but will issue a warning.
481 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
482 // the command-line, while issuing a warning and ignoring the flag value.
483 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
484 // existence of the flag.
485 //
486 // MANUAL CLEANUP ON JDK VERSION UPDATES:
487 // This table ensures that the handling of options will update automatically when the JDK
488 // version is incremented, but the source code needs to be cleanup up manually:
489 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
490 // variable should be removed, as well as users of the variable.
491 // - As "deprecated" options age into "obsolete" options, move the entry into the
492 // "Obsolete Flags" section of the table.
493 // - All expired options should be removed from the table.
494 static SpecialFlag const special_jvm_flags[] = {
495 // -------------- Deprecated Flags --------------
496 // --- Non-alias flags - sorted by obsolete_in then expired_in:
497 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
498 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
499 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
500 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
501 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
502 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
503 { "RegisterFinalizersAtInit", JDK_Version::jdk(22), JDK_Version::jdk(23), JDK_Version::jdk(24) },
504 #if defined(X86)
505 { "UseRTMLocking", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
506 { "UseRTMDeopt", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
507 { "RTMRetryCount", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
508 #endif // X86
509 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
510 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
511
512 // -------------- Obsolete Flags - sorted by expired_in --------------
513
514 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
515
516 { "G1ConcRefinementGreenZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) },
517 { "G1ConcRefinementYellowZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) },
518 { "G1ConcRefinementRedZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) },
519 { "G1ConcRefinementThresholdStep", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) },
520 { "G1UseAdaptiveConcRefinement", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) },
521 { "G1ConcRefinementServiceIntervalMillis", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) },
522
523 { "G1ConcRSLogCacheSize", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::jdk(24) },
524 { "G1ConcRSHotCardLimit", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::jdk(24) },
525 { "RefDiscoveryPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::jdk(24) },
526
527 { "AdaptiveSizePolicyCollectionCostMargin", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
528 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::jdk(23), JDK_Version::jdk(24) },
529 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::jdk(23), JDK_Version::jdk(24) },
530 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::jdk(23), JDK_Version::jdk(24) },
531 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::jdk(23), JDK_Version::jdk(24) },
532 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::jdk(23), JDK_Version::jdk(24) },
533 { "TLABStats", JDK_Version::jdk(12), JDK_Version::jdk(23), JDK_Version::jdk(24) },
534 { "GCLockerEdenExpansionPercent", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
535 { "NUMAPageScanRate", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
536 { "ProcessDistributionStride", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
537
538 { "ParallelOldDeadWoodLimiterMean", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
539 { "ParallelOldDeadWoodLimiterStdDev", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
540 { "UseNeon", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) },
541 #ifdef ASSERT
542 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
543 #endif
544
545 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
546 // These entries will generate build errors. Their purpose is to test the macros.
547 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
548 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
549 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
550 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
551 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
552 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
553 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
554 #endif
555
556 { nullptr, JDK_Version(0), JDK_Version(0) }
557 };
558
559 // Flags that are aliases for other flags.
560 typedef struct {
561 const char* alias_name;
562 const char* real_name;
563 } AliasedFlag;
564
565 static AliasedFlag const aliased_jvm_flags[] = {
566 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
567 { nullptr, nullptr}
568 };
569
570 // Return true if "v" is less than "other", where "other" may be "undefined".
571 static bool version_less_than(JDK_Version v, JDK_Version other) {
572 assert(!v.is_undefined(), "must be defined");
573 if (!other.is_undefined() && v.compare(other) >= 0) {
574 return false;
575 } else {
576 return true;
577 }
578 }
579
580 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
581 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
582 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
583 flag = special_jvm_flags[i];
584 return true;
585 }
586 }
587 return false;
588 }
589
590 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
591 assert(version != nullptr, "Must provide a version buffer");
592 SpecialFlag flag;
593 if (lookup_special_flag(flag_name, flag)) {
594 if (!flag.obsolete_in.is_undefined()) {
595 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
596 *version = flag.obsolete_in;
597 // This flag may have been marked for obsoletion in this version, but we may not
598 // have actually removed it yet. Rather than ignoring it as soon as we reach
599 // this version we allow some time for the removal to happen. So if the flag
600 // still actually exists we process it as normal, but issue an adjusted warning.
601 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
602 if (real_flag != nullptr) {
603 char version_str[256];
604 version->to_string(version_str, sizeof(version_str));
605 warning("Temporarily processing option %s; support is scheduled for removal in %s",
606 flag_name, version_str);
607 return false;
608 }
609 return true;
610 }
611 }
612 }
613 return false;
614 }
615
616 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
617 assert(version != nullptr, "Must provide a version buffer");
618 SpecialFlag flag;
619 if (lookup_special_flag(flag_name, flag)) {
620 if (!flag.deprecated_in.is_undefined()) {
621 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
622 version_less_than(JDK_Version::current(), flag.expired_in)) {
623 *version = flag.deprecated_in;
624 return 1;
625 } else {
626 return -1;
627 }
628 }
629 }
630 return 0;
631 }
632
633 const char* Arguments::real_flag_name(const char *flag_name) {
634 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
635 const AliasedFlag& flag_status = aliased_jvm_flags[i];
636 if (strcmp(flag_status.alias_name, flag_name) == 0) {
637 return flag_status.real_name;
638 }
639 }
640 return flag_name;
641 }
642
643 #ifdef ASSERT
644 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
645 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
646 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
647 return true;
648 }
649 }
650 return false;
651 }
652
653 // Verifies the correctness of the entries in the special_jvm_flags table.
654 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
655 // version being earlier than the deprecation version, then a warning is issued
656 // and verification fails - by returning false. If it is detected that the table
657 // is out of date, with respect to the current version, then ideally a warning is
658 // issued but verification does not fail. This allows the VM to operate when the
659 // version is first updated, without needing to update all the impacted flags at
660 // the same time. In practice we can't issue the warning immediately when the version
661 // is updated as it occurs for every test and some tests are not prepared to handle
662 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
663 // if the check_globals flag is true, and in addition allow a grace period and only
664 // check for stale flags when we hit build 25 (which is far enough into the 6 month
665 // release cycle that all flag updates should have been processed, whilst still
666 // leaving time to make the change before RDP2).
667 // We use a gtest to call this, passing true, so that we can detect stale flags before
668 // the end of the release cycle.
669
670 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
671
672 bool Arguments::verify_special_jvm_flags(bool check_globals) {
673 bool success = true;
674 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
675 const SpecialFlag& flag = special_jvm_flags[i];
676 if (lookup_special_flag(flag.name, i)) {
677 warning("Duplicate special flag declaration \"%s\"", flag.name);
678 success = false;
679 }
680 if (flag.deprecated_in.is_undefined() &&
681 flag.obsolete_in.is_undefined()) {
682 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
683 success = false;
684 }
685
686 if (!flag.deprecated_in.is_undefined()) {
687 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
688 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
689 success = false;
690 }
691
692 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
693 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
694 success = false;
695 }
696 }
697
698 if (!flag.obsolete_in.is_undefined()) {
699 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
700 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
701 success = false;
702 }
703
704 // if flag has become obsolete it should not have a "globals" flag defined anymore.
705 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
706 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
707 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
708 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
709 success = false;
710 }
711 }
712
713 } else if (!flag.expired_in.is_undefined()) {
714 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
715 success = false;
716 }
717
718 if (!flag.expired_in.is_undefined()) {
719 // if flag has become expired it should not have a "globals" flag defined anymore.
720 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
721 !version_less_than(JDK_Version::current(), flag.expired_in)) {
722 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
723 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
724 success = false;
725 }
726 }
727 }
728 }
729 return success;
730 }
731 #endif
732
733 bool Arguments::atojulong(const char *s, julong* result) {
734 return parse_integer(s, result);
735 }
736
737 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
738 if (size < min_size) return arg_too_small;
739 if (size > max_size) return arg_too_big;
740 return arg_in_range;
741 }
742
743 // Describe an argument out of range error
744 void Arguments::describe_range_error(ArgsRange errcode) {
745 switch(errcode) {
746 case arg_too_big:
747 jio_fprintf(defaultStream::error_stream(),
748 "The specified size exceeds the maximum "
749 "representable size.\n");
750 break;
751 case arg_too_small:
752 case arg_unreadable:
753 case arg_in_range:
754 // do nothing for now
755 break;
756 default:
757 ShouldNotReachHere();
758 }
759 }
760
761 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
762 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
763 return true;
764 } else {
765 return false;
766 }
767 }
768
769 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
770 // strtod allows leading whitespace, but our flag format does not.
771 if (*value == '\0' || isspace(*value)) {
772 return false;
773 }
774 char* end;
775 errno = 0;
776 double v = strtod(value, &end);
777 if ((errno != 0) || (*end != 0)) {
778 return false;
779 }
780 if (g_isnan(v) || !g_isfinite(v)) {
781 // Currently we cannot handle these special values.
782 return false;
783 }
784
785 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
786 return true;
787 }
788 return false;
789 }
790
791 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
792 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
793
794 if (flag->is_int()) {
795 int v;
796 if (parse_integer(value, &v)) {
797 result = JVMFlagAccess::set_int(flag, &v, origin);
798 }
799 } else if (flag->is_uint()) {
800 uint v;
801 if (parse_integer(value, &v)) {
802 result = JVMFlagAccess::set_uint(flag, &v, origin);
803 }
804 } else if (flag->is_intx()) {
805 intx v;
806 if (parse_integer(value, &v)) {
807 result = JVMFlagAccess::set_intx(flag, &v, origin);
808 }
809 } else if (flag->is_uintx()) {
810 uintx v;
811 if (parse_integer(value, &v)) {
812 result = JVMFlagAccess::set_uintx(flag, &v, origin);
813 }
814 } else if (flag->is_uint64_t()) {
815 uint64_t v;
816 if (parse_integer(value, &v)) {
817 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
818 }
819 } else if (flag->is_size_t()) {
820 size_t v;
821 if (parse_integer(value, &v)) {
822 result = JVMFlagAccess::set_size_t(flag, &v, origin);
823 }
824 }
825
826 return result == JVMFlag::SUCCESS;
827 }
828
829 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
830 if (value[0] == '\0') {
831 value = nullptr;
832 }
833 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
834 // Contract: JVMFlag always returns a pointer that needs freeing.
835 FREE_C_HEAP_ARRAY(char, value);
836 return true;
837 }
838
839 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
840 const char* old_value = "";
841 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
842 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
843 size_t new_len = strlen(new_value);
844 const char* value;
845 char* free_this_too = nullptr;
846 if (old_len == 0) {
847 value = new_value;
848 } else if (new_len == 0) {
849 value = old_value;
850 } else {
851 size_t length = old_len + 1 + new_len + 1;
852 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
853 // each new setting adds another LINE to the switch:
854 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
855 value = buf;
856 free_this_too = buf;
857 }
858 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
859 // JVMFlag always returns a pointer that needs freeing.
860 FREE_C_HEAP_ARRAY(char, value);
861 // JVMFlag made its own copy, so I must delete my own temp. buffer.
862 FREE_C_HEAP_ARRAY(char, free_this_too);
863 return true;
864 }
865
866 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
867 const char* real_name = real_flag_name(arg);
868 JDK_Version since = JDK_Version();
869 switch (is_deprecated_flag(arg, &since)) {
870 case -1: {
871 // Obsolete or expired, so don't process normally,
872 // but allow for an obsolete flag we're still
873 // temporarily allowing.
874 if (!is_obsolete_flag(arg, &since)) {
875 return real_name;
876 }
877 // Note if we're not considered obsolete then we can't be expired either
878 // as obsoletion must come first.
879 return nullptr;
880 }
881 case 0:
882 return real_name;
883 case 1: {
884 char version[256];
885 since.to_string(version, sizeof(version));
886 if (real_name != arg) {
887 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
888 arg, version, real_name);
889 } else {
890 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
891 arg, version);
892 }
893 return real_name;
894 }
895 }
896 ShouldNotReachHere();
897 return nullptr;
898 }
899
900 #define BUFLEN 255
901
902 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
903 char name_copied[BUFLEN+1];
904 if (name[name_length] != 0) {
905 if (name_length > BUFLEN) {
906 return nullptr;
907 } else {
908 strncpy(name_copied, name, name_length);
909 name_copied[name_length] = '\0';
910 name = name_copied;
911 }
912 }
913
914 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
915 if (real_name == nullptr) {
916 return nullptr;
917 }
918 JVMFlag* flag = JVMFlag::find_flag(real_name);
919 return flag;
920 }
921
922 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
923 bool is_bool = false;
924 bool bool_val = false;
925 char c = *arg;
926 if (c == '+' || c == '-') {
927 is_bool = true;
928 bool_val = (c == '+');
929 arg++;
930 }
931
932 const char* name = arg;
933 while (true) {
934 c = *arg;
935 if (isalnum(c) || (c == '_')) {
936 ++arg;
937 } else {
938 break;
939 }
940 }
941
942 size_t name_len = size_t(arg - name);
943 if (name_len == 0) {
944 return false;
945 }
946
947 JVMFlag* flag = find_jvm_flag(name, name_len);
948 if (flag == nullptr) {
949 return false;
950 }
951
952 if (is_bool) {
953 if (*arg != 0) {
954 // Error -- extra characters such as -XX:+BoolFlag=123
955 return false;
956 }
957 return set_bool_flag(flag, bool_val, origin);
958 }
959
960 if (arg[0] == '=') {
961 const char* value = arg + 1;
962 if (flag->is_ccstr()) {
963 if (flag->ccstr_accumulates()) {
964 return append_to_string_flag(flag, value, origin);
965 } else {
966 return set_string_flag(flag, value, origin);
967 }
968 } else if (flag->is_double()) {
969 return set_fp_numeric_flag(flag, value, origin);
970 } else {
971 return set_numeric_flag(flag, value, origin);
972 }
973 }
974
975 if (arg[0] == ':' && arg[1] == '=') {
976 // -XX:Foo:=xxx will reset the string flag to the given value.
977 const char* value = arg + 2;
978 return set_string_flag(flag, value, origin);
979 }
980
981 return false;
982 }
983
984 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
985 assert(bldarray != nullptr, "illegal argument");
986
987 if (arg == nullptr) {
988 return;
989 }
990
991 int new_count = *count + 1;
992
993 // expand the array and add arg to the last element
994 if (*bldarray == nullptr) {
995 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
996 } else {
997 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
998 }
999 (*bldarray)[*count] = os::strdup_check_oom(arg);
1000 *count = new_count;
1001 }
1002
1003 void Arguments::build_jvm_args(const char* arg) {
1004 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1005 }
1006
1007 void Arguments::build_jvm_flags(const char* arg) {
1008 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1009 }
1010
1011 // utility function to return a string that concatenates all
1012 // strings in a given char** array
1013 const char* Arguments::build_resource_string(char** args, int count) {
1014 if (args == nullptr || count == 0) {
1015 return nullptr;
1016 }
1017 size_t length = 0;
1018 for (int i = 0; i < count; i++) {
1019 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1020 }
1021 char* s = NEW_RESOURCE_ARRAY(char, length);
1022 char* dst = s;
1023 for (int j = 0; j < count; j++) {
1024 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1025 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1026 dst += offset;
1027 length -= offset;
1028 }
1029 return (const char*) s;
1030 }
1031
1032 void Arguments::print_on(outputStream* st) {
1033 st->print_cr("VM Arguments:");
1034 if (num_jvm_flags() > 0) {
1035 st->print("jvm_flags: "); print_jvm_flags_on(st);
1036 st->cr();
1037 }
1038 if (num_jvm_args() > 0) {
1039 st->print("jvm_args: "); print_jvm_args_on(st);
1040 st->cr();
1041 }
1042 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1043 if (_java_class_path != nullptr) {
1044 char* path = _java_class_path->value();
1045 size_t len = strlen(path);
1046 st->print("java_class_path (initial): ");
1047 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1048 if (len == 0) {
1049 st->print_raw_cr("<not set>");
1050 } else {
1051 st->print_raw_cr(path, len);
1052 }
1053 }
1054 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1055 }
1056
1057 void Arguments::print_summary_on(outputStream* st) {
1058 // Print the command line. Environment variables that are helpful for
1059 // reproducing the problem are written later in the hs_err file.
1060 // flags are from setting file
1061 if (num_jvm_flags() > 0) {
1062 st->print_raw("Settings File: ");
1063 print_jvm_flags_on(st);
1064 st->cr();
1065 }
1066 // args are the command line and environment variable arguments.
1067 st->print_raw("Command Line: ");
1068 if (num_jvm_args() > 0) {
1069 print_jvm_args_on(st);
1070 }
1071 // this is the classfile and any arguments to the java program
1072 if (java_command() != nullptr) {
1073 st->print("%s", java_command());
1074 }
1075 st->cr();
1076 }
1077
1078 void Arguments::print_jvm_flags_on(outputStream* st) {
1079 if (_num_jvm_flags > 0) {
1080 for (int i=0; i < _num_jvm_flags; i++) {
1081 st->print("%s ", _jvm_flags_array[i]);
1082 }
1083 }
1084 }
1085
1086 void Arguments::print_jvm_args_on(outputStream* st) {
1087 if (_num_jvm_args > 0) {
1088 for (int i=0; i < _num_jvm_args; i++) {
1089 st->print("%s ", _jvm_args_array[i]);
1090 }
1091 }
1092 }
1093
1094 bool Arguments::process_argument(const char* arg,
1095 jboolean ignore_unrecognized,
1096 JVMFlagOrigin origin) {
1097 JDK_Version since = JDK_Version();
1098
1099 if (parse_argument(arg, origin)) {
1100 return true;
1101 }
1102
1103 // Determine if the flag has '+', '-', or '=' characters.
1104 bool has_plus_minus = (*arg == '+' || *arg == '-');
1105 const char* const argname = has_plus_minus ? arg + 1 : arg;
1106
1107 size_t arg_len;
1108 const char* equal_sign = strchr(argname, '=');
1109 if (equal_sign == nullptr) {
1110 arg_len = strlen(argname);
1111 } else {
1112 arg_len = equal_sign - argname;
1113 }
1114
1115 // Only make the obsolete check for valid arguments.
1116 if (arg_len <= BUFLEN) {
1117 // Construct a string which consists only of the argument name without '+', '-', or '='.
1118 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1119 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1120 if (is_obsolete_flag(stripped_argname, &since)) {
1121 char version[256];
1122 since.to_string(version, sizeof(version));
1123 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1124 return true;
1125 }
1126 }
1127
1128 // For locked flags, report a custom error message if available.
1129 // Otherwise, report the standard unrecognized VM option.
1130 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1131 if (found_flag != nullptr) {
1132 char locked_message_buf[BUFLEN];
1133 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1134 if (strlen(locked_message_buf) != 0) {
1135 #ifdef PRODUCT
1136 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1137 if (ignore_unrecognized && mismatched) {
1138 return true;
1139 }
1140 #endif
1141 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1142 }
1143 if (found_flag->is_bool() && !has_plus_minus) {
1144 jio_fprintf(defaultStream::error_stream(),
1145 "Missing +/- setting for VM option '%s'\n", argname);
1146 } else if (!found_flag->is_bool() && has_plus_minus) {
1147 jio_fprintf(defaultStream::error_stream(),
1148 "Unexpected +/- setting in VM option '%s'\n", argname);
1149 } else {
1150 jio_fprintf(defaultStream::error_stream(),
1151 "Improperly specified VM option '%s'\n", argname);
1152 }
1153 } else {
1154 if (ignore_unrecognized) {
1155 return true;
1156 }
1157 jio_fprintf(defaultStream::error_stream(),
1158 "Unrecognized VM option '%s'\n", argname);
1159 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1160 if (fuzzy_matched != nullptr) {
1161 jio_fprintf(defaultStream::error_stream(),
1162 "Did you mean '%s%s%s'?\n",
1163 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1164 fuzzy_matched->name(),
1165 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1166 }
1167 }
1168
1169 // allow for commandline "commenting out" options like -XX:#+Verbose
1170 return arg[0] == '#';
1171 }
1172
1173 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1174 FILE* stream = os::fopen(file_name, "rb");
1175 if (stream == nullptr) {
1176 if (should_exist) {
1177 jio_fprintf(defaultStream::error_stream(),
1178 "Could not open settings file %s\n", file_name);
1179 return false;
1180 } else {
1181 return true;
1182 }
1183 }
1184
1185 char token[1024];
1186 int pos = 0;
1187
1188 bool in_white_space = true;
1189 bool in_comment = false;
1190 bool in_quote = false;
1191 int quote_c = 0;
1192 bool result = true;
1193
1194 int c = getc(stream);
1195 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1196 if (in_white_space) {
1197 if (in_comment) {
1198 if (c == '\n') in_comment = false;
1199 } else {
1200 if (c == '#') in_comment = true;
1201 else if (!isspace(c)) {
1202 in_white_space = false;
1203 token[pos++] = checked_cast<char>(c);
1204 }
1205 }
1206 } else {
1207 if (c == '\n' || (!in_quote && isspace(c))) {
1208 // token ends at newline, or at unquoted whitespace
1209 // this allows a way to include spaces in string-valued options
1210 token[pos] = '\0';
1211 logOption(token);
1212 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1213 build_jvm_flags(token);
1214 pos = 0;
1215 in_white_space = true;
1216 in_quote = false;
1217 } else if (!in_quote && (c == '\'' || c == '"')) {
1218 in_quote = true;
1219 quote_c = c;
1220 } else if (in_quote && (c == quote_c)) {
1221 in_quote = false;
1222 } else {
1223 token[pos++] = checked_cast<char>(c);
1224 }
1225 }
1226 c = getc(stream);
1227 }
1228 if (pos > 0) {
1229 token[pos] = '\0';
1230 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1231 build_jvm_flags(token);
1232 }
1233 fclose(stream);
1234 return result;
1235 }
1236
1237 //=============================================================================================================
1238 // Parsing of properties (-D)
1239
1240 const char* Arguments::get_property(const char* key) {
1241 return PropertyList_get_value(system_properties(), key);
1242 }
1243
1244 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1245 const char* eq = strchr(prop, '=');
1246 const char* key;
1247 const char* value = "";
1248
1249 if (eq == nullptr) {
1250 // property doesn't have a value, thus use passed string
1251 key = prop;
1252 } else {
1253 // property have a value, thus extract it and save to the
1254 // allocated string
1255 size_t key_len = eq - prop;
1256 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1257
1258 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1259 key = tmp_key;
1260
1261 value = &prop[key_len + 1];
1262 }
1263
1264 if (internal == ExternalProperty) {
1265 CDSConfig::check_incompatible_property(key, value);
1266 }
1267
1268 if (strcmp(key, "java.compiler") == 0) {
1269 // we no longer support java.compiler system property, log a warning and let it get
1270 // passed to Java, like any other system property
1271 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1272 // for applications using NONE or empty value, log a more informative message
1273 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1274 } else {
1275 warning("The java.compiler system property is obsolete and no longer supported.");
1276 }
1277 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1278 // sun.java.launcher.is_altjvm property is
1279 // private and is processed in process_sun_java_launcher_properties();
1280 // the sun.java.launcher property is passed on to the java application
1281 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1282 // append is true, writable is true, internal is false
1283 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1284 WriteableProperty, ExternalProperty);
1285 } else {
1286 if (strcmp(key, "sun.java.command") == 0) {
1287 char *old_java_command = _java_command;
1288 _java_command = os::strdup_check_oom(value, mtArguments);
1289 if (old_java_command != nullptr) {
1290 os::free(old_java_command);
1291 }
1292 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1293 // If this property is set on the command line then its value will be
1294 // displayed in VM error logs as the URL at which to submit such logs.
1295 // Normally the URL displayed in error logs is different from the value
1296 // of this system property, so a different property should have been
1297 // used here, but we leave this as-is in case someone depends upon it.
1298 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1299 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1300 // its value without going through the property list or making a Java call.
1301 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1302 if (old_java_vendor_url_bug != nullptr) {
1303 os::free((void *)old_java_vendor_url_bug);
1304 }
1305 }
1306
1307 // Create new property and add at the end of the list
1308 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1309 }
1310
1311 if (key != prop) {
1312 // SystemProperty copy passed value, thus free previously allocated
1313 // memory
1314 FreeHeap((void *)key);
1315 }
1316
1317 return true;
1318 }
1319
1320 //===========================================================================================================
1321 // Setting int/mixed/comp mode flags
1322
1323 void Arguments::set_mode_flags(Mode mode) {
1324 // Set up default values for all flags.
1325 // If you add a flag to any of the branches below,
1326 // add a default value for it here.
1327 _mode = mode;
1328
1329 // Ensure Agent_OnLoad has the correct initial values.
1330 // This may not be the final mode; mode may change later in onload phase.
1331 PropertyList_unique_add(&_system_properties, "java.vm.info",
1332 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1333
1334 UseInterpreter = true;
1335 UseCompiler = true;
1336 UseLoopCounter = true;
1337
1338 // Default values may be platform/compiler dependent -
1339 // use the saved values
1340 ClipInlining = Arguments::_ClipInlining;
1341 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1342 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1343 BackgroundCompilation = Arguments::_BackgroundCompilation;
1344
1345 // Change from defaults based on mode
1346 switch (mode) {
1347 default:
1348 ShouldNotReachHere();
1349 break;
1350 case _int:
1351 UseCompiler = false;
1352 UseLoopCounter = false;
1353 AlwaysCompileLoopMethods = false;
1354 UseOnStackReplacement = false;
1355 break;
1356 case _mixed:
1357 // same as default
1358 break;
1359 case _comp:
1360 UseInterpreter = false;
1361 BackgroundCompilation = false;
1362 ClipInlining = false;
1363 break;
1364 }
1365 }
1366
1367 // Conflict: required to use shared spaces (-Xshare:on), but
1368 // incompatible command line options were chosen.
1369 void Arguments::no_shared_spaces(const char* message) {
1370 if (RequireSharedSpaces) {
1371 jio_fprintf(defaultStream::error_stream(),
1372 "Class data sharing is inconsistent with other specified options.\n");
1373 vm_exit_during_initialization("Unable to use shared archive", message);
1374 } else {
1375 log_info(cds)("Unable to use shared archive: %s", message);
1376 UseSharedSpaces = false;
1377 }
1378 }
1379
1380 static void set_object_alignment() {
1381 // Object alignment.
1382 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1383 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1384 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1385 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1386 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1387 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1388
1389 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1390 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1391
1392 // Oop encoding heap max
1393 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1394 }
1395
1396 size_t Arguments::max_heap_for_compressed_oops() {
1397 // Avoid sign flip.
1398 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1399 // We need to fit both the null page and the heap into the memory budget, while
1400 // keeping alignment constraints of the heap. To guarantee the latter, as the
1401 // null page is located before the heap, we pad the null page to the conservative
1402 // maximum alignment that the GC may ever impose upon the heap.
1403 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1404 _conservative_max_heap_alignment);
1405
1406 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1407 NOT_LP64(ShouldNotReachHere(); return 0);
1408 }
1409
1410 void Arguments::set_use_compressed_oops() {
1411 #ifdef _LP64
1412 // MaxHeapSize is not set up properly at this point, but
1413 // the only value that can override MaxHeapSize if we are
1414 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1415 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1416
1417 if (max_heap_size <= max_heap_for_compressed_oops()) {
1418 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1419 FLAG_SET_ERGO(UseCompressedOops, true);
1420 }
1421 } else {
1422 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1423 warning("Max heap size too large for Compressed Oops");
1424 FLAG_SET_DEFAULT(UseCompressedOops, false);
1425 }
1426 }
1427 #endif // _LP64
1428 }
1429
1430 void Arguments::set_use_compressed_klass_ptrs() {
1431 #ifdef _LP64
1432 assert(!UseCompressedClassPointers || CompressedClassSpaceSize <= KlassEncodingMetaspaceMax,
1433 "CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1434 #endif // _LP64
1435 }
1436
1437 void Arguments::set_conservative_max_heap_alignment() {
1438 // The conservative maximum required alignment for the heap is the maximum of
1439 // the alignments imposed by several sources: any requirements from the heap
1440 // itself and the maximum page size we may run the VM with.
1441 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1442 _conservative_max_heap_alignment = MAX4(heap_alignment,
1443 os::vm_allocation_granularity(),
1444 os::max_page_size(),
1445 GCArguments::compute_heap_alignment());
1446 }
1447
1448 jint Arguments::set_ergonomics_flags() {
1449 GCConfig::initialize();
1450
1451 set_conservative_max_heap_alignment();
1452
1453 #ifdef _LP64
1454 set_use_compressed_oops();
1455 set_use_compressed_klass_ptrs();
1456
1457 // Also checks that certain machines are slower with compressed oops
1458 // in vm_version initialization code.
1459 #endif // _LP64
1460
1461 return JNI_OK;
1462 }
1463
1464 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1465 size_t max_allocatable;
1466 size_t result = limit;
1467 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1468 // The AggressiveHeap check is a temporary workaround to avoid calling
1469 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1470 // selected. This works because AggressiveHeap implies UseParallelGC
1471 // where we know the ratio will be 1. Once the AggressiveHeap option is
1472 // removed, this can be cleaned up.
1473 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1474 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1475 result = MIN2(result, max_allocatable / fraction);
1476 }
1477 return result;
1478 }
1479
1480 // Use static initialization to get the default before parsing
1481 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1482
1483 void Arguments::set_heap_size() {
1484 julong phys_mem;
1485
1486 // If the user specified one of these options, they
1487 // want specific memory sizing so do not limit memory
1488 // based on compressed oops addressability.
1489 // Also, memory limits will be calculated based on
1490 // available os physical memory, not our MaxRAM limit,
1491 // unless MaxRAM is also specified.
1492 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1493 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1494 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1495 !FLAG_IS_DEFAULT(MaxRAM));
1496 if (override_coop_limit) {
1497 if (FLAG_IS_DEFAULT(MaxRAM)) {
1498 phys_mem = os::physical_memory();
1499 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1500 } else {
1501 phys_mem = (julong)MaxRAM;
1502 }
1503 } else {
1504 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1505 : (julong)MaxRAM;
1506 }
1507
1508 // If the maximum heap size has not been set with -Xmx,
1509 // then set it as fraction of the size of physical memory,
1510 // respecting the maximum and minimum sizes of the heap.
1511 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1512 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1513 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1514 if (reasonable_min < MaxHeapSize) {
1515 // Small physical memory, so use a minimum fraction of it for the heap
1516 reasonable_max = reasonable_min;
1517 } else {
1518 // Not-small physical memory, so require a heap at least
1519 // as large as MaxHeapSize
1520 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1521 }
1522
1523 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1524 // Limit the heap size to ErgoHeapSizeLimit
1525 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1526 }
1527
1528 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1529
1530 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1531 // An initial heap size was specified on the command line,
1532 // so be sure that the maximum size is consistent. Done
1533 // after call to limit_heap_by_allocatable_memory because that
1534 // method might reduce the allocation size.
1535 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1536 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1537 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1538 }
1539
1540 #ifdef _LP64
1541 if (UseCompressedOops || UseCompressedClassPointers) {
1542 // HeapBaseMinAddress can be greater than default but not less than.
1543 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1544 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1545 // matches compressed oops printing flags
1546 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1547 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1548 DefaultHeapBaseMinAddress,
1549 DefaultHeapBaseMinAddress/G,
1550 HeapBaseMinAddress);
1551 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1552 }
1553 }
1554 }
1555 if (UseCompressedOops) {
1556 // Limit the heap size to the maximum possible when using compressed oops
1557 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1558
1559 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1560 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1561 // but it should be not less than default MaxHeapSize.
1562 max_coop_heap -= HeapBaseMinAddress;
1563 }
1564
1565 // If user specified flags prioritizing os physical
1566 // memory limits, then disable compressed oops if
1567 // limits exceed max_coop_heap and UseCompressedOops
1568 // was not specified.
1569 if (reasonable_max > max_coop_heap) {
1570 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1571 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1572 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1573 "Please check the setting of MaxRAMPercentage %5.2f."
1574 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1575 FLAG_SET_ERGO(UseCompressedOops, false);
1576 } else {
1577 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1578 }
1579 }
1580 }
1581 #endif // _LP64
1582
1583 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1584 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1585 }
1586
1587 // If the minimum or initial heap_size have not been set or requested to be set
1588 // ergonomically, set them accordingly.
1589 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1590 julong reasonable_minimum = (julong)(OldSize + NewSize);
1591
1592 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1593
1594 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1595
1596 if (InitialHeapSize == 0) {
1597 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1598 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1599
1600 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1601 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1602
1603 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1604 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1605 }
1606 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1607 // synchronize with InitialHeapSize to avoid errors with the default value.
1608 if (MinHeapSize == 0) {
1609 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1610 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1611 }
1612 }
1613 }
1614
1615 // This option inspects the machine and attempts to set various
1616 // parameters to be optimal for long-running, memory allocation
1617 // intensive jobs. It is intended for machines with large
1618 // amounts of cpu and memory.
1619 jint Arguments::set_aggressive_heap_flags() {
1620 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1621 // VM, but we may not be able to represent the total physical memory
1622 // available (like having 8gb of memory on a box but using a 32bit VM).
1623 // Thus, we need to make sure we're using a julong for intermediate
1624 // calculations.
1625 julong initHeapSize;
1626 julong total_memory = os::physical_memory();
1627
1628 if (total_memory < (julong) 256 * M) {
1629 jio_fprintf(defaultStream::error_stream(),
1630 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1631 vm_exit(1);
1632 }
1633
1634 // The heap size is half of available memory, or (at most)
1635 // all of possible memory less 160mb (leaving room for the OS
1636 // when using ISM). This is the maximum; because adaptive sizing
1637 // is turned on below, the actual space used may be smaller.
1638
1639 initHeapSize = MIN2(total_memory / (julong) 2,
1640 total_memory - (julong) 160 * M);
1641
1642 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1643
1644 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1645 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1646 return JNI_EINVAL;
1647 }
1648 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1649 return JNI_EINVAL;
1650 }
1651 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1652 return JNI_EINVAL;
1653 }
1654 }
1655 if (FLAG_IS_DEFAULT(NewSize)) {
1656 // Make the young generation 3/8ths of the total heap.
1657 if (FLAG_SET_CMDLINE(NewSize,
1658 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1659 return JNI_EINVAL;
1660 }
1661 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1662 return JNI_EINVAL;
1663 }
1664 }
1665
1666 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1667 FLAG_SET_DEFAULT(UseLargePages, true);
1668 #endif
1669
1670 // Increase some data structure sizes for efficiency
1671 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1672 return JNI_EINVAL;
1673 }
1674 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1675 return JNI_EINVAL;
1676 }
1677 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1678 return JNI_EINVAL;
1679 }
1680
1681 // See the OldPLABSize comment below, but replace 'after promotion'
1682 // with 'after copying'. YoungPLABSize is the size of the survivor
1683 // space per-gc-thread buffers. The default is 4kw.
1684 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1685 return JNI_EINVAL;
1686 }
1687
1688 // OldPLABSize is the size of the buffers in the old gen that
1689 // UseParallelGC uses to promote live data that doesn't fit in the
1690 // survivor spaces. At any given time, there's one for each gc thread.
1691 // The default size is 1kw. These buffers are rarely used, since the
1692 // survivor spaces are usually big enough. For specjbb, however, there
1693 // are occasions when there's lots of live data in the young gen
1694 // and we end up promoting some of it. We don't have a definite
1695 // explanation for why bumping OldPLABSize helps, but the theory
1696 // is that a bigger PLAB results in retaining something like the
1697 // original allocation order after promotion, which improves mutator
1698 // locality. A minor effect may be that larger PLABs reduce the
1699 // number of PLAB allocation events during gc. The value of 8kw
1700 // was arrived at by experimenting with specjbb.
1701 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1702 return JNI_EINVAL;
1703 }
1704
1705 // Enable parallel GC and adaptive generation sizing
1706 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1707 return JNI_EINVAL;
1708 }
1709
1710 // Encourage steady state memory management
1711 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1712 return JNI_EINVAL;
1713 }
1714
1715 // This appears to improve mutator locality
1716 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1717 return JNI_EINVAL;
1718 }
1719
1720 return JNI_OK;
1721 }
1722
1723 // This must be called after ergonomics.
1724 void Arguments::set_bytecode_flags() {
1725 if (!RewriteBytecodes) {
1726 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1727 }
1728 }
1729
1730 // Aggressive optimization flags
1731 jint Arguments::set_aggressive_opts_flags() {
1732 #ifdef COMPILER2
1733 if (AggressiveUnboxing) {
1734 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1735 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1736 } else if (!EliminateAutoBox) {
1737 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1738 AggressiveUnboxing = false;
1739 }
1740 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1741 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1742 } else if (!DoEscapeAnalysis) {
1743 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1744 AggressiveUnboxing = false;
1745 }
1746 }
1747 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1748 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1749 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1750 }
1751 // Feed the cache size setting into the JDK
1752 char buffer[1024];
1753 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1754 if (!add_property(buffer)) {
1755 return JNI_ENOMEM;
1756 }
1757 }
1758 #endif
1759
1760 return JNI_OK;
1761 }
1762
1763 //===========================================================================================================
1764
1765 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1766 if (_sun_java_launcher != _default_java_launcher) {
1767 os::free(const_cast<char*>(_sun_java_launcher));
1768 }
1769 _sun_java_launcher = os::strdup_check_oom(launcher);
1770 }
1771
1772 bool Arguments::created_by_java_launcher() {
1773 assert(_sun_java_launcher != nullptr, "property must have value");
1774 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1775 }
1776
1777 bool Arguments::sun_java_launcher_is_altjvm() {
1778 return _sun_java_launcher_is_altjvm;
1779 }
1780
1781 //===========================================================================================================
1782 // Parsing of main arguments
1783
1784 unsigned int addreads_count = 0;
1785 unsigned int addexports_count = 0;
1786 unsigned int addopens_count = 0;
1787 unsigned int addmods_count = 0;
1788 unsigned int patch_mod_count = 0;
1789 unsigned int enable_native_access_count = 0;
1790
1791 // Check the consistency of vm_init_args
1792 bool Arguments::check_vm_args_consistency() {
1793 // Method for adding checks for flag consistency.
1794 // The intent is to warn the user of all possible conflicts,
1795 // before returning an error.
1796 // Note: Needs platform-dependent factoring.
1797 bool status = true;
1798
1799 if (TLABRefillWasteFraction == 0) {
1800 jio_fprintf(defaultStream::error_stream(),
1801 "TLABRefillWasteFraction should be a denominator, "
1802 "not " SIZE_FORMAT "\n",
1803 TLABRefillWasteFraction);
1804 status = false;
1805 }
1806
1807 status = CompilerConfig::check_args_consistency(status);
1808 #if INCLUDE_JVMCI
1809 if (status && EnableJVMCI) {
1810 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1811 AddProperty, UnwriteableProperty, InternalProperty);
1812 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1813 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
1814 return false;
1815 }
1816 }
1817 }
1818 #endif
1819
1820 #if INCLUDE_JFR
1821 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1822 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) {
1823 return false;
1824 }
1825 }
1826 #endif
1827
1828 #ifndef SUPPORT_RESERVED_STACK_AREA
1829 if (StackReservedPages != 0) {
1830 FLAG_SET_CMDLINE(StackReservedPages, 0);
1831 warning("Reserved Stack Area not supported on this platform");
1832 }
1833 #endif
1834
1835 #if !defined(X86) && !defined(AARCH64) && !defined(RISCV64) && !defined(ARM) && !defined(PPC64) && !defined(S390)
1836 if (LockingMode == LM_LIGHTWEIGHT) {
1837 FLAG_SET_CMDLINE(LockingMode, LM_LEGACY);
1838 warning("New lightweight locking not supported on this platform");
1839 }
1840 #endif
1841
1842 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1843 if (LockingMode == LM_MONITOR) {
1844 jio_fprintf(defaultStream::error_stream(),
1845 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1846 return false;
1847 }
1848 #endif
1849 #if defined(X86) && !defined(ZERO)
1850 if (LockingMode == LM_MONITOR && UseRTMForStackLocks) {
1851 jio_fprintf(defaultStream::error_stream(),
1852 "LockingMode == 0 (LM_MONITOR) and -XX:+UseRTMForStackLocks are mutually exclusive\n");
1853
1854 return false;
1855 }
1856 #endif
1857 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1858 jio_fprintf(defaultStream::error_stream(),
1859 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1860 return false;
1861 }
1862 return status;
1863 }
1864
1865 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1866 const char* option_type) {
1867 if (ignore) return false;
1868
1869 const char* spacer = " ";
1870 if (option_type == nullptr) {
1871 option_type = ++spacer; // Set both to the empty string.
1872 }
1873
1874 jio_fprintf(defaultStream::error_stream(),
1875 "Unrecognized %s%soption: %s\n", option_type, spacer,
1876 option->optionString);
1877 return true;
1878 }
1879
1880 static const char* user_assertion_options[] = {
1881 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1882 };
1883
1884 static const char* system_assertion_options[] = {
1885 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1886 };
1887
1888 bool Arguments::parse_uint(const char* value,
1889 uint* uint_arg,
1890 uint min_size) {
1891 uint n;
1892 if (!parse_integer(value, &n)) {
1893 return false;
1894 }
1895 if (n >= min_size) {
1896 *uint_arg = n;
1897 return true;
1898 } else {
1899 return false;
1900 }
1901 }
1902
1903 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1904 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1905 CDSConfig::check_internal_module_property(prop_name, prop_value);
1906 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1907 char* property = AllocateHeap(prop_len, mtArguments);
1908 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1909 if (ret < 0 || ret >= (int)prop_len) {
1910 FreeHeap(property);
1911 return false;
1912 }
1913 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1914 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1915 // that multiple occurrences of the associated flag just causes the existing property value to be
1916 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1917 // to a property after we have finished flag processing.
1918 bool added = add_property(property, WriteableProperty, internal);
1919 FreeHeap(property);
1920 return added;
1921 }
1922
1923 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1924 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1925 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1926 const unsigned int props_count_limit = 1000;
1927 const int max_digits = 3;
1928 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1929
1930 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1931 if (count < props_count_limit) {
1932 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1933 char* property = AllocateHeap(prop_len, mtArguments);
1934 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1935 if (ret < 0 || ret >= (int)prop_len) {
1936 FreeHeap(property);
1937 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1938 return false;
1939 }
1940 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1941 FreeHeap(property);
1942 return added;
1943 }
1944
1945 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1946 return false;
1947 }
1948
1949 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1950 julong* long_arg,
1951 julong min_size,
1952 julong max_size) {
1953 if (!parse_integer(s, long_arg)) return arg_unreadable;
1954 return check_memory_size(*long_arg, min_size, max_size);
1955 }
1956
1957 // Parse JavaVMInitArgs structure
1958
1959 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1960 const JavaVMInitArgs *java_tool_options_args,
1961 const JavaVMInitArgs *java_options_args,
1962 const JavaVMInitArgs *cmd_line_args) {
1963 bool patch_mod_javabase = false;
1964
1965 // Save default settings for some mode flags
1966 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1967 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1968 Arguments::_ClipInlining = ClipInlining;
1969 Arguments::_BackgroundCompilation = BackgroundCompilation;
1970
1971 // Remember the default value of SharedBaseAddress.
1972 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1973
1974 // Setup flags for mixed which is the default
1975 set_mode_flags(_mixed);
1976
1977 // Parse args structure generated from java.base vm options resource
1978 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE);
1979 if (result != JNI_OK) {
1980 return result;
1981 }
1982
1983 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
1984 // variable (if present).
1985 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
1986 if (result != JNI_OK) {
1987 return result;
1988 }
1989
1990 // Parse args structure generated from the command line flags.
1991 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE);
1992 if (result != JNI_OK) {
1993 return result;
1994 }
1995
1996 // Parse args structure generated from the _JAVA_OPTIONS environment
1997 // variable (if present) (mimics classic VM)
1998 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
1999 if (result != JNI_OK) {
2000 return result;
2001 }
2002
2003 // Disable CDS for exploded image
2004 if (!has_jimage()) {
2005 no_shared_spaces("CDS disabled on exploded JDK");
2006 }
2007
2008 // We need to ensure processor and memory resources have been properly
2009 // configured - which may rely on arguments we just processed - before
2010 // doing the final argument processing. Any argument processing that
2011 // needs to know about processor and memory resources must occur after
2012 // this point.
2013
2014 os::init_container_support();
2015
2016 SystemMemoryBarrier::initialize();
2017
2018 // Do final processing now that all arguments have been parsed
2019 result = finalize_vm_init_args(patch_mod_javabase);
2020 if (result != JNI_OK) {
2021 return result;
2022 }
2023
2024 return JNI_OK;
2025 }
2026
2027 #if !INCLUDE_JVMTI
2028 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2029 // represents a valid JDWP agent. is_path==true denotes that we
2030 // are dealing with -agentpath (case where name is a path), otherwise with
2031 // -agentlib
2032 static bool valid_jdwp_agent(char *name, bool is_path) {
2033 char *_name;
2034 const char *_jdwp = "jdwp";
2035 size_t _len_jdwp, _len_prefix;
2036
2037 if (is_path) {
2038 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2039 return false;
2040 }
2041
2042 _name++; // skip past last path separator
2043 _len_prefix = strlen(JNI_LIB_PREFIX);
2044
2045 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2046 return false;
2047 }
2048
2049 _name += _len_prefix;
2050 _len_jdwp = strlen(_jdwp);
2051
2052 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2053 _name += _len_jdwp;
2054 }
2055 else {
2056 return false;
2057 }
2058
2059 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2060 return false;
2061 }
2062
2063 return true;
2064 }
2065
2066 if (strcmp(name, _jdwp) == 0) {
2067 return true;
2068 }
2069
2070 return false;
2071 }
2072 #endif
2073
2074 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2075 // --patch-module=<module>=<file>(<pathsep><file>)*
2076 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2077 // Find the equal sign between the module name and the path specification
2078 const char* module_equal = strchr(patch_mod_tail, '=');
2079 if (module_equal == nullptr) {
2080 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2081 return JNI_ERR;
2082 } else {
2083 // Pick out the module name
2084 size_t module_len = module_equal - patch_mod_tail;
2085 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2086 if (module_name != nullptr) {
2087 memcpy(module_name, patch_mod_tail, module_len);
2088 *(module_name + module_len) = '\0';
2089 // The path piece begins one past the module_equal sign
2090 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2091 FREE_C_HEAP_ARRAY(char, module_name);
2092 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2093 return JNI_ENOMEM;
2094 }
2095 } else {
2096 return JNI_ENOMEM;
2097 }
2098 }
2099 return JNI_OK;
2100 }
2101
2102 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2103 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2104 // The min and max sizes match the values in globals.hpp, but scaled
2105 // with K. The values have been chosen so that alignment with page
2106 // size doesn't change the max value, which makes the conversions
2107 // back and forth between Xss value and ThreadStackSize value easier.
2108 // The values have also been chosen to fit inside a 32-bit signed type.
2109 const julong min_ThreadStackSize = 0;
2110 const julong max_ThreadStackSize = 1 * M;
2111
2112 // Make sure the above values match the range set in globals.hpp
2113 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2114 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2115 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2116
2117 const julong min_size = min_ThreadStackSize * K;
2118 const julong max_size = max_ThreadStackSize * K;
2119
2120 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2121
2122 julong size = 0;
2123 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2124 if (errcode != arg_in_range) {
2125 bool silent = (option == nullptr); // Allow testing to silence error messages
2126 if (!silent) {
2127 jio_fprintf(defaultStream::error_stream(),
2128 "Invalid thread stack size: %s\n", option->optionString);
2129 describe_range_error(errcode);
2130 }
2131 return JNI_EINVAL;
2132 }
2133
2134 // Internally track ThreadStackSize in units of 1024 bytes.
2135 const julong size_aligned = align_up(size, K);
2136 assert(size <= size_aligned,
2137 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2138 size, size_aligned);
2139
2140 const julong size_in_K = size_aligned / K;
2141 assert(size_in_K < (julong)max_intx,
2142 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2143 size_in_K);
2144
2145 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2146 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2147 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2148 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2149 max_expanded, size_in_K);
2150
2151 *out_ThreadStackSize = (intx)size_in_K;
2152
2153 return JNI_OK;
2154 }
2155
2156 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) {
2157 // For match_option to return remaining or value part of option string
2158 const char* tail;
2159
2160 // iterate over arguments
2161 for (int index = 0; index < args->nOptions; index++) {
2162 bool is_absolute_path = false; // for -agentpath vs -agentlib
2163
2164 const JavaVMOption* option = args->options + index;
2165
2166 if (!match_option(option, "-Djava.class.path", &tail) &&
2167 !match_option(option, "-Dsun.java.command", &tail) &&
2168 !match_option(option, "-Dsun.java.launcher", &tail)) {
2169
2170 // add all jvm options to the jvm_args string. This string
2171 // is used later to set the java.vm.args PerfData string constant.
2172 // the -Djava.class.path and the -Dsun.java.command options are
2173 // omitted from jvm_args string as each have their own PerfData
2174 // string constant object.
2175 build_jvm_args(option->optionString);
2176 }
2177
2178 // -verbose:[class/module/gc/jni]
2179 if (match_option(option, "-verbose", &tail)) {
2180 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2181 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2182 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2183 } else if (!strcmp(tail, ":module")) {
2184 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2185 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2186 } else if (!strcmp(tail, ":gc")) {
2187 if (_legacyGCLogging.lastFlag == 0) {
2188 _legacyGCLogging.lastFlag = 1;
2189 }
2190 } else if (!strcmp(tail, ":jni")) {
2191 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2192 }
2193 // -da / -ea / -disableassertions / -enableassertions
2194 // These accept an optional class/package name separated by a colon, e.g.,
2195 // -da:java.lang.Thread.
2196 } else if (match_option(option, user_assertion_options, &tail, true)) {
2197 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2198 if (*tail == '\0') {
2199 JavaAssertions::setUserClassDefault(enable);
2200 } else {
2201 assert(*tail == ':', "bogus match by match_option()");
2202 JavaAssertions::addOption(tail + 1, enable);
2203 }
2204 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2205 } else if (match_option(option, system_assertion_options, &tail, false)) {
2206 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2207 JavaAssertions::setSystemClassDefault(enable);
2208 // -bootclasspath:
2209 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2210 jio_fprintf(defaultStream::output_stream(),
2211 "-Xbootclasspath is no longer a supported option.\n");
2212 return JNI_EINVAL;
2213 // -bootclasspath/a:
2214 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2215 Arguments::append_sysclasspath(tail);
2216 // -bootclasspath/p:
2217 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2218 jio_fprintf(defaultStream::output_stream(),
2219 "-Xbootclasspath/p is no longer a supported option.\n");
2220 return JNI_EINVAL;
2221 // -Xrun
2222 } else if (match_option(option, "-Xrun", &tail)) {
2223 if (tail != nullptr) {
2224 const char* pos = strchr(tail, ':');
2225 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2226 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2227 jio_snprintf(name, len + 1, "%s", tail);
2228
2229 char *options = nullptr;
2230 if(pos != nullptr) {
2231 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2232 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2233 }
2234 #if !INCLUDE_JVMTI
2235 if (strcmp(name, "jdwp") == 0) {
2236 jio_fprintf(defaultStream::error_stream(),
2237 "Debugging agents are not supported in this VM\n");
2238 return JNI_ERR;
2239 }
2240 #endif // !INCLUDE_JVMTI
2241 JvmtiAgentList::add_xrun(name, options, false);
2242 FREE_C_HEAP_ARRAY(char, name);
2243 FREE_C_HEAP_ARRAY(char, options);
2244 }
2245 } else if (match_option(option, "--add-reads=", &tail)) {
2246 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2247 return JNI_ENOMEM;
2248 }
2249 } else if (match_option(option, "--add-exports=", &tail)) {
2250 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2251 return JNI_ENOMEM;
2252 }
2253 } else if (match_option(option, "--add-opens=", &tail)) {
2254 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2255 return JNI_ENOMEM;
2256 }
2257 } else if (match_option(option, "--add-modules=", &tail)) {
2258 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2259 return JNI_ENOMEM;
2260 }
2261 } else if (match_option(option, "--enable-native-access=", &tail)) {
2262 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2263 return JNI_ENOMEM;
2264 }
2265 } else if (match_option(option, "--limit-modules=", &tail)) {
2266 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2267 return JNI_ENOMEM;
2268 }
2269 } else if (match_option(option, "--module-path=", &tail)) {
2270 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2271 return JNI_ENOMEM;
2272 }
2273 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2274 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2275 return JNI_ENOMEM;
2276 }
2277 } else if (match_option(option, "--patch-module=", &tail)) {
2278 // --patch-module=<module>=<file>(<pathsep><file>)*
2279 int res = process_patch_mod_option(tail, patch_mod_javabase);
2280 if (res != JNI_OK) {
2281 return res;
2282 }
2283 } else if (match_option(option, "--illegal-access=", &tail)) {
2284 char version[256];
2285 JDK_Version::jdk(17).to_string(version, sizeof(version));
2286 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2287 // -agentlib and -agentpath
2288 } else if (match_option(option, "-agentlib:", &tail) ||
2289 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2290 if(tail != nullptr) {
2291 const char* pos = strchr(tail, '=');
2292 char* name;
2293 if (pos == nullptr) {
2294 name = os::strdup_check_oom(tail, mtArguments);
2295 } else {
2296 size_t len = pos - tail;
2297 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2298 memcpy(name, tail, len);
2299 name[len] = '\0';
2300 }
2301
2302 char *options = nullptr;
2303 if(pos != nullptr) {
2304 options = os::strdup_check_oom(pos + 1, mtArguments);
2305 }
2306 #if !INCLUDE_JVMTI
2307 if (valid_jdwp_agent(name, is_absolute_path)) {
2308 jio_fprintf(defaultStream::error_stream(),
2309 "Debugging agents are not supported in this VM\n");
2310 return JNI_ERR;
2311 }
2312 #endif // !INCLUDE_JVMTI
2313 JvmtiAgentList::add(name, options, is_absolute_path);
2314 os::free(name);
2315 os::free(options);
2316 }
2317 // -javaagent
2318 } else if (match_option(option, "-javaagent:", &tail)) {
2319 #if !INCLUDE_JVMTI
2320 jio_fprintf(defaultStream::error_stream(),
2321 "Instrumentation agents are not supported in this VM\n");
2322 return JNI_ERR;
2323 #else
2324 if (tail != nullptr) {
2325 size_t length = strlen(tail) + 1;
2326 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2327 jio_snprintf(options, length, "%s", tail);
2328 JvmtiAgentList::add("instrument", options, false);
2329 FREE_C_HEAP_ARRAY(char, options);
2330
2331 // java agents need module java.instrument
2332 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2333 return JNI_ENOMEM;
2334 }
2335 }
2336 #endif // !INCLUDE_JVMTI
2337 // --enable_preview
2338 } else if (match_option(option, "--enable-preview")) {
2339 set_enable_preview();
2340 // -Xnoclassgc
2341 } else if (match_option(option, "-Xnoclassgc")) {
2342 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2343 return JNI_EINVAL;
2344 }
2345 // -Xbatch
2346 } else if (match_option(option, "-Xbatch")) {
2347 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2348 return JNI_EINVAL;
2349 }
2350 // -Xmn for compatibility with other JVM vendors
2351 } else if (match_option(option, "-Xmn", &tail)) {
2352 julong long_initial_young_size = 0;
2353 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2354 if (errcode != arg_in_range) {
2355 jio_fprintf(defaultStream::error_stream(),
2356 "Invalid initial young generation size: %s\n", option->optionString);
2357 describe_range_error(errcode);
2358 return JNI_EINVAL;
2359 }
2360 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2361 return JNI_EINVAL;
2362 }
2363 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2364 return JNI_EINVAL;
2365 }
2366 // -Xms
2367 } else if (match_option(option, "-Xms", &tail)) {
2368 julong size = 0;
2369 // an initial heap size of 0 means automatically determine
2370 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2371 if (errcode != arg_in_range) {
2372 jio_fprintf(defaultStream::error_stream(),
2373 "Invalid initial heap size: %s\n", option->optionString);
2374 describe_range_error(errcode);
2375 return JNI_EINVAL;
2376 }
2377 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2378 return JNI_EINVAL;
2379 }
2380 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2381 return JNI_EINVAL;
2382 }
2383 // -Xmx
2384 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2385 julong long_max_heap_size = 0;
2386 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2387 if (errcode != arg_in_range) {
2388 jio_fprintf(defaultStream::error_stream(),
2389 "Invalid maximum heap size: %s\n", option->optionString);
2390 describe_range_error(errcode);
2391 return JNI_EINVAL;
2392 }
2393 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2394 return JNI_EINVAL;
2395 }
2396 // Xmaxf
2397 } else if (match_option(option, "-Xmaxf", &tail)) {
2398 char* err;
2399 int maxf = (int)(strtod(tail, &err) * 100);
2400 if (*err != '\0' || *tail == '\0') {
2401 jio_fprintf(defaultStream::error_stream(),
2402 "Bad max heap free percentage size: %s\n",
2403 option->optionString);
2404 return JNI_EINVAL;
2405 } else {
2406 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2407 return JNI_EINVAL;
2408 }
2409 }
2410 // Xminf
2411 } else if (match_option(option, "-Xminf", &tail)) {
2412 char* err;
2413 int minf = (int)(strtod(tail, &err) * 100);
2414 if (*err != '\0' || *tail == '\0') {
2415 jio_fprintf(defaultStream::error_stream(),
2416 "Bad min heap free percentage size: %s\n",
2417 option->optionString);
2418 return JNI_EINVAL;
2419 } else {
2420 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2421 return JNI_EINVAL;
2422 }
2423 }
2424 // -Xss
2425 } else if (match_option(option, "-Xss", &tail)) {
2426 intx value = 0;
2427 jint err = parse_xss(option, tail, &value);
2428 if (err != JNI_OK) {
2429 return err;
2430 }
2431 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2432 return JNI_EINVAL;
2433 }
2434 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2435 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2436 julong long_ReservedCodeCacheSize = 0;
2437
2438 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2439 if (errcode != arg_in_range) {
2440 jio_fprintf(defaultStream::error_stream(),
2441 "Invalid maximum code cache size: %s.\n", option->optionString);
2442 return JNI_EINVAL;
2443 }
2444 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2445 return JNI_EINVAL;
2446 }
2447 // -green
2448 } else if (match_option(option, "-green")) {
2449 jio_fprintf(defaultStream::error_stream(),
2450 "Green threads support not available\n");
2451 return JNI_EINVAL;
2452 // -native
2453 } else if (match_option(option, "-native")) {
2454 // HotSpot always uses native threads, ignore silently for compatibility
2455 // -Xrs
2456 } else if (match_option(option, "-Xrs")) {
2457 // Classic/EVM option, new functionality
2458 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2459 return JNI_EINVAL;
2460 }
2461 // -Xprof
2462 } else if (match_option(option, "-Xprof")) {
2463 char version[256];
2464 // Obsolete in JDK 10
2465 JDK_Version::jdk(10).to_string(version, sizeof(version));
2466 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2467 // -Xinternalversion
2468 } else if (match_option(option, "-Xinternalversion")) {
2469 jio_fprintf(defaultStream::output_stream(), "%s\n",
2470 VM_Version::internal_vm_info_string());
2471 vm_exit(0);
2472 #ifndef PRODUCT
2473 // -Xprintflags
2474 } else if (match_option(option, "-Xprintflags")) {
2475 JVMFlag::printFlags(tty, false);
2476 vm_exit(0);
2477 #endif
2478 // -D
2479 } else if (match_option(option, "-D", &tail)) {
2480 const char* value;
2481 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2482 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2483 // abort if -Djava.endorsed.dirs is set
2484 jio_fprintf(defaultStream::output_stream(),
2485 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2486 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2487 return JNI_EINVAL;
2488 }
2489 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2490 *value != '\0' && strcmp(value, "\"\"") != 0) {
2491 // abort if -Djava.ext.dirs is set
2492 jio_fprintf(defaultStream::output_stream(),
2493 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2494 return JNI_EINVAL;
2495 }
2496 // Check for module related properties. They must be set using the modules
2497 // options. For example: use "--add-modules=java.sql", not
2498 // "-Djdk.module.addmods=java.sql"
2499 if (is_internal_module_property(option->optionString + 2)) {
2500 needs_module_property_warning = true;
2501 continue;
2502 }
2503 if (!add_property(tail)) {
2504 return JNI_ENOMEM;
2505 }
2506 // Out of the box management support
2507 if (match_option(option, "-Dcom.sun.management", &tail)) {
2508 #if INCLUDE_MANAGEMENT
2509 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2510 return JNI_EINVAL;
2511 }
2512 // management agent in module jdk.management.agent
2513 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2514 return JNI_ENOMEM;
2515 }
2516 #else
2517 jio_fprintf(defaultStream::output_stream(),
2518 "-Dcom.sun.management is not supported in this VM.\n");
2519 return JNI_ERR;
2520 #endif
2521 }
2522 // -Xint
2523 } else if (match_option(option, "-Xint")) {
2524 set_mode_flags(_int);
2525 mode_flag_cmd_line = true;
2526 // -Xmixed
2527 } else if (match_option(option, "-Xmixed")) {
2528 set_mode_flags(_mixed);
2529 mode_flag_cmd_line = true;
2530 // -Xcomp
2531 } else if (match_option(option, "-Xcomp")) {
2532 // for testing the compiler; turn off all flags that inhibit compilation
2533 set_mode_flags(_comp);
2534 mode_flag_cmd_line = true;
2535 // -Xshare:dump
2536 } else if (match_option(option, "-Xshare:dump")) {
2537 CDSConfig::enable_dumping_static_archive();
2538 // -Xshare:on
2539 } else if (match_option(option, "-Xshare:on")) {
2540 UseSharedSpaces = true;
2541 RequireSharedSpaces = true;
2542 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2543 } else if (match_option(option, "-Xshare:auto")) {
2544 UseSharedSpaces = true;
2545 RequireSharedSpaces = false;
2546 xshare_auto_cmd_line = true;
2547 // -Xshare:off
2548 } else if (match_option(option, "-Xshare:off")) {
2549 UseSharedSpaces = false;
2550 RequireSharedSpaces = false;
2551 // -Xverify
2552 } else if (match_option(option, "-Xverify", &tail)) {
2553 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2554 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2555 return JNI_EINVAL;
2556 }
2557 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2558 return JNI_EINVAL;
2559 }
2560 } else if (strcmp(tail, ":remote") == 0) {
2561 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2562 return JNI_EINVAL;
2563 }
2564 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2565 return JNI_EINVAL;
2566 }
2567 } else if (strcmp(tail, ":none") == 0) {
2568 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2569 return JNI_EINVAL;
2570 }
2571 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2572 return JNI_EINVAL;
2573 }
2574 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2575 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2576 return JNI_EINVAL;
2577 }
2578 // -Xdebug
2579 } else if (match_option(option, "-Xdebug")) {
2580 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2581 } else if (match_option(option, "-Xloggc:", &tail)) {
2582 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2583 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2584 _legacyGCLogging.lastFlag = 2;
2585 _legacyGCLogging.file = os::strdup_check_oom(tail);
2586 } else if (match_option(option, "-Xlog", &tail)) {
2587 bool ret = false;
2588 if (strcmp(tail, ":help") == 0) {
2589 fileStream stream(defaultStream::output_stream());
2590 LogConfiguration::print_command_line_help(&stream);
2591 vm_exit(0);
2592 } else if (strcmp(tail, ":disable") == 0) {
2593 LogConfiguration::disable_logging();
2594 ret = true;
2595 } else if (strcmp(tail, ":async") == 0) {
2596 LogConfiguration::set_async_mode(true);
2597 ret = true;
2598 } else if (*tail == '\0') {
2599 ret = LogConfiguration::parse_command_line_arguments();
2600 assert(ret, "-Xlog without arguments should never fail to parse");
2601 } else if (*tail == ':') {
2602 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2603 }
2604 if (ret == false) {
2605 jio_fprintf(defaultStream::error_stream(),
2606 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2607 tail);
2608 return JNI_EINVAL;
2609 }
2610 // JNI hooks
2611 } else if (match_option(option, "-Xcheck", &tail)) {
2612 if (!strcmp(tail, ":jni")) {
2613 #if !INCLUDE_JNI_CHECK
2614 warning("JNI CHECKING is not supported in this VM");
2615 #else
2616 CheckJNICalls = true;
2617 #endif // INCLUDE_JNI_CHECK
2618 } else if (is_bad_option(option, args->ignoreUnrecognized,
2619 "check")) {
2620 return JNI_EINVAL;
2621 }
2622 } else if (match_option(option, "vfprintf")) {
2623 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2624 } else if (match_option(option, "exit")) {
2625 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2626 } else if (match_option(option, "abort")) {
2627 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2628 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2629 // and the last option wins.
2630 } else if (match_option(option, "-XX:+NeverTenure")) {
2631 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2632 return JNI_EINVAL;
2633 }
2634 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2635 return JNI_EINVAL;
2636 }
2637 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2638 return JNI_EINVAL;
2639 }
2640 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2641 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2642 return JNI_EINVAL;
2643 }
2644 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2645 return JNI_EINVAL;
2646 }
2647 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2648 return JNI_EINVAL;
2649 }
2650 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2651 uint max_tenuring_thresh = 0;
2652 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2653 jio_fprintf(defaultStream::error_stream(),
2654 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2655 return JNI_EINVAL;
2656 }
2657
2658 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2659 return JNI_EINVAL;
2660 }
2661
2662 if (MaxTenuringThreshold == 0) {
2663 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2664 return JNI_EINVAL;
2665 }
2666 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2667 return JNI_EINVAL;
2668 }
2669 } else {
2670 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2671 return JNI_EINVAL;
2672 }
2673 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2674 return JNI_EINVAL;
2675 }
2676 }
2677 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2678 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2679 return JNI_EINVAL;
2680 }
2681 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2682 return JNI_EINVAL;
2683 }
2684 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2685 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2686 return JNI_EINVAL;
2687 }
2688 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2689 return JNI_EINVAL;
2690 }
2691 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2692 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2693 return JNI_EINVAL;
2694 }
2695 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2696 return JNI_EINVAL;
2697 }
2698 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2699 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2700 return JNI_EINVAL;
2701 }
2702 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2703 return JNI_EINVAL;
2704 }
2705 } else if (match_option(option, "--finalization=", &tail)) {
2706 if (strcmp(tail, "enabled") == 0) {
2707 InstanceKlass::set_finalization_enabled(true);
2708 } else if (strcmp(tail, "disabled") == 0) {
2709 InstanceKlass::set_finalization_enabled(false);
2710 } else {
2711 jio_fprintf(defaultStream::error_stream(),
2712 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2713 tail);
2714 return JNI_EINVAL;
2715 }
2716 #if !defined(DTRACE_ENABLED)
2717 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2718 jio_fprintf(defaultStream::error_stream(),
2719 "DTraceMethodProbes flag is not applicable for this configuration\n");
2720 return JNI_EINVAL;
2721 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2722 jio_fprintf(defaultStream::error_stream(),
2723 "DTraceAllocProbes flag is not applicable for this configuration\n");
2724 return JNI_EINVAL;
2725 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2726 jio_fprintf(defaultStream::error_stream(),
2727 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2728 return JNI_EINVAL;
2729 #endif // !defined(DTRACE_ENABLED)
2730 #ifdef ASSERT
2731 } else if (match_option(option, "-XX:+FullGCALot")) {
2732 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2733 return JNI_EINVAL;
2734 }
2735 // disable scavenge before parallel mark-compact
2736 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2737 return JNI_EINVAL;
2738 }
2739 #endif
2740 #if !INCLUDE_MANAGEMENT
2741 } else if (match_option(option, "-XX:+ManagementServer")) {
2742 jio_fprintf(defaultStream::error_stream(),
2743 "ManagementServer is not supported in this VM.\n");
2744 return JNI_ERR;
2745 #endif // INCLUDE_MANAGEMENT
2746 #if INCLUDE_JVMCI
2747 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2748 if (EnableJVMCIProduct) {
2749 jio_fprintf(defaultStream::error_stream(),
2750 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2751 return JNI_EINVAL;
2752 }
2753 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2754 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2755 if (use_graal_jit) {
2756 const char* jvmci_compiler = get_property("jvmci.Compiler");
2757 if (jvmci_compiler != nullptr) {
2758 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2759 jio_fprintf(defaultStream::error_stream(),
2760 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2761 return JNI_ERR;
2762 }
2763 } else if (!add_property("jvmci.Compiler=graal")) {
2764 return JNI_ENOMEM;
2765 }
2766 }
2767
2768 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2769 if (EnableJVMCIProduct) {
2770 continue;
2771 }
2772 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2773 // Allow this flag if it has been unlocked.
2774 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2775 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2776 jio_fprintf(defaultStream::error_stream(),
2777 "Unable to enable JVMCI in product mode\n");
2778 return JNI_ERR;
2779 }
2780 }
2781 // The flag was locked so process normally to report that error
2782 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2783 return JNI_EINVAL;
2784 }
2785 #endif // INCLUDE_JVMCI
2786 #if INCLUDE_JFR
2787 } else if (match_jfr_option(&option)) {
2788 return JNI_EINVAL;
2789 #endif
2790 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2791 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2792 // already been handled
2793 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2794 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2795 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2796 return JNI_EINVAL;
2797 }
2798 }
2799 // Unknown option
2800 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2801 return JNI_ERR;
2802 }
2803 }
2804
2805 // PrintSharedArchiveAndExit will turn on
2806 // -Xshare:on
2807 // -Xlog:class+path=info
2808 if (PrintSharedArchiveAndExit) {
2809 UseSharedSpaces = true;
2810 RequireSharedSpaces = true;
2811 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2812 }
2813
2814 fix_appclasspath();
2815
2816 return JNI_OK;
2817 }
2818
2819 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
2820 // For java.base check for duplicate --patch-module options being specified on the command line.
2821 // This check is only required for java.base, all other duplicate module specifications
2822 // will be checked during module system initialization. The module system initialization
2823 // will throw an ExceptionInInitializerError if this situation occurs.
2824 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2825 if (*patch_mod_javabase) {
2826 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2827 } else {
2828 *patch_mod_javabase = true;
2829 }
2830 }
2831
2832 // Create GrowableArray lazily, only if --patch-module has been specified
2833 if (_patch_mod_prefix == nullptr) {
2834 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2835 }
2836
2837 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2838 }
2839
2840 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2841 //
2842 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2843 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2844 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2845 // path is treated as the current directory.
2846 //
2847 // This causes problems with CDS, which requires that all directories specified in the classpath
2848 // must be empty. In most cases, applications do NOT want to load classes from the current
2849 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2850 // scripts compatible with CDS.
2851 void Arguments::fix_appclasspath() {
2852 if (IgnoreEmptyClassPaths) {
2853 const char separator = *os::path_separator();
2854 const char* src = _java_class_path->value();
2855
2856 // skip over all the leading empty paths
2857 while (*src == separator) {
2858 src ++;
2859 }
2860
2861 char* copy = os::strdup_check_oom(src, mtArguments);
2862
2863 // trim all trailing empty paths
2864 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2865 *tail = '\0';
2866 }
2867
2868 char from[3] = {separator, separator, '\0'};
2869 char to [2] = {separator, '\0'};
2870 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2871 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2872 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2873 }
2874
2875 _java_class_path->set_writeable_value(copy);
2876 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2877 }
2878 }
2879
2880 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
2881 // check if the default lib/endorsed directory exists; if so, error
2882 char path[JVM_MAXPATHLEN];
2883 const char* fileSep = os::file_separator();
2884 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2885
2886 DIR* dir = os::opendir(path);
2887 if (dir != nullptr) {
2888 jio_fprintf(defaultStream::output_stream(),
2889 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2890 "in modular form will be supported via the concept of upgradeable modules.\n");
2891 os::closedir(dir);
2892 return JNI_ERR;
2893 }
2894
2895 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2896 dir = os::opendir(path);
2897 if (dir != nullptr) {
2898 jio_fprintf(defaultStream::output_stream(),
2899 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2900 "Use -classpath instead.\n.");
2901 os::closedir(dir);
2902 return JNI_ERR;
2903 }
2904
2905 // This must be done after all arguments have been processed
2906 // and the container support has been initialized since AggressiveHeap
2907 // relies on the amount of total memory available.
2908 if (AggressiveHeap) {
2909 jint result = set_aggressive_heap_flags();
2910 if (result != JNI_OK) {
2911 return result;
2912 }
2913 }
2914
2915 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2916 // but like -Xint, leave compilation thresholds unaffected.
2917 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2918 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2919 set_mode_flags(_int);
2920 }
2921
2922 #ifdef ZERO
2923 // Zero always runs in interpreted mode
2924 set_mode_flags(_int);
2925 #endif
2926
2927 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2928 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2929 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2930 }
2931
2932 #if !COMPILER2_OR_JVMCI
2933 // Don't degrade server performance for footprint
2934 if (FLAG_IS_DEFAULT(UseLargePages) &&
2935 MaxHeapSize < LargePageHeapSizeThreshold) {
2936 // No need for large granularity pages w/small heaps.
2937 // Note that large pages are enabled/disabled for both the
2938 // Java heap and the code cache.
2939 FLAG_SET_DEFAULT(UseLargePages, false);
2940 }
2941
2942 UNSUPPORTED_OPTION(ProfileInterpreter);
2943 #endif
2944
2945 // Parse the CompilationMode flag
2946 if (!CompilationModeFlag::initialize()) {
2947 return JNI_ERR;
2948 }
2949
2950 if (!check_vm_args_consistency()) {
2951 return JNI_ERR;
2952 }
2953
2954 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
2955 return JNI_ERR;
2956 }
2957
2958 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2959 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2960 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2961
2962 return JNI_OK;
2963 }
2964
2965 // Helper class for controlling the lifetime of JavaVMInitArgs
2966 // objects. The contents of the JavaVMInitArgs are guaranteed to be
2967 // deleted on the destruction of the ScopedVMInitArgs object.
2968 class ScopedVMInitArgs : public StackObj {
2969 private:
2970 JavaVMInitArgs _args;
2971 char* _container_name;
2972 bool _is_set;
2973 char* _vm_options_file_arg;
2974
2975 public:
2976 ScopedVMInitArgs(const char *container_name) {
2977 _args.version = JNI_VERSION_1_2;
2978 _args.nOptions = 0;
2979 _args.options = nullptr;
2980 _args.ignoreUnrecognized = false;
2981 _container_name = (char *)container_name;
2982 _is_set = false;
2983 _vm_options_file_arg = nullptr;
2984 }
2985
2986 // Populates the JavaVMInitArgs object represented by this
2987 // ScopedVMInitArgs object with the arguments in options. The
2988 // allocated memory is deleted by the destructor. If this method
2989 // returns anything other than JNI_OK, then this object is in a
2990 // partially constructed state, and should be abandoned.
2991 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
2992 _is_set = true;
2993 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
2994 JavaVMOption, options->length(), mtArguments);
2995 if (options_arr == nullptr) {
2996 return JNI_ENOMEM;
2997 }
2998 _args.options = options_arr;
2999
3000 for (int i = 0; i < options->length(); i++) {
3001 options_arr[i] = options->at(i);
3002 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3003 if (options_arr[i].optionString == nullptr) {
3004 // Rely on the destructor to do cleanup.
3005 _args.nOptions = i;
3006 return JNI_ENOMEM;
3007 }
3008 }
3009
3010 _args.nOptions = options->length();
3011 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3012 return JNI_OK;
3013 }
3014
3015 JavaVMInitArgs* get() { return &_args; }
3016 char* container_name() { return _container_name; }
3017 bool is_set() { return _is_set; }
3018 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3019 char* vm_options_file_arg() { return _vm_options_file_arg; }
3020
3021 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3022 if (_vm_options_file_arg != nullptr) {
3023 os::free(_vm_options_file_arg);
3024 }
3025 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3026 }
3027
3028 ~ScopedVMInitArgs() {
3029 if (_vm_options_file_arg != nullptr) {
3030 os::free(_vm_options_file_arg);
3031 }
3032 if (_args.options == nullptr) return;
3033 for (int i = 0; i < _args.nOptions; i++) {
3034 os::free(_args.options[i].optionString);
3035 }
3036 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3037 }
3038
3039 // Insert options into this option list, to replace option at
3040 // vm_options_file_pos (-XX:VMOptionsFile)
3041 jint insert(const JavaVMInitArgs* args,
3042 const JavaVMInitArgs* args_to_insert,
3043 const int vm_options_file_pos) {
3044 assert(_args.options == nullptr, "shouldn't be set yet");
3045 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3046 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3047
3048 int length = args->nOptions + args_to_insert->nOptions - 1;
3049 // Construct new option array
3050 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3051 for (int i = 0; i < args->nOptions; i++) {
3052 if (i == vm_options_file_pos) {
3053 // insert the new options starting at the same place as the
3054 // -XX:VMOptionsFile option
3055 for (int j = 0; j < args_to_insert->nOptions; j++) {
3056 options.push(args_to_insert->options[j]);
3057 }
3058 } else {
3059 options.push(args->options[i]);
3060 }
3061 }
3062 // make into options array
3063 return set_args(&options);
3064 }
3065 };
3066
3067 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3068 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3069 }
3070
3071 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3072 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3073 }
3074
3075 jint Arguments::parse_options_environment_variable(const char* name,
3076 ScopedVMInitArgs* vm_args) {
3077 char *buffer = ::getenv(name);
3078
3079 // Don't check this environment variable if user has special privileges
3080 // (e.g. unix su command).
3081 if (buffer == nullptr || os::have_special_privileges()) {
3082 return JNI_OK;
3083 }
3084
3085 if ((buffer = os::strdup(buffer)) == nullptr) {
3086 return JNI_ENOMEM;
3087 }
3088
3089 jio_fprintf(defaultStream::error_stream(),
3090 "Picked up %s: %s\n", name, buffer);
3091
3092 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3093
3094 os::free(buffer);
3095 return retcode;
3096 }
3097
3098 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3099 // read file into buffer
3100 int fd = ::open(file_name, O_RDONLY);
3101 if (fd < 0) {
3102 jio_fprintf(defaultStream::error_stream(),
3103 "Could not open options file '%s'\n",
3104 file_name);
3105 return JNI_ERR;
3106 }
3107
3108 struct stat stbuf;
3109 int retcode = os::stat(file_name, &stbuf);
3110 if (retcode != 0) {
3111 jio_fprintf(defaultStream::error_stream(),
3112 "Could not stat options file '%s'\n",
3113 file_name);
3114 ::close(fd);
3115 return JNI_ERR;
3116 }
3117
3118 if (stbuf.st_size == 0) {
3119 // tell caller there is no option data and that is ok
3120 ::close(fd);
3121 return JNI_OK;
3122 }
3123
3124 // '+ 1' for null termination even with max bytes
3125 size_t bytes_alloc = stbuf.st_size + 1;
3126
3127 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3128 if (nullptr == buf) {
3129 jio_fprintf(defaultStream::error_stream(),
3130 "Could not allocate read buffer for options file parse\n");
3131 ::close(fd);
3132 return JNI_ENOMEM;
3133 }
3134
3135 memset(buf, 0, bytes_alloc);
3136
3137 // Fill buffer
3138 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3139 ::close(fd);
3140 if (bytes_read < 0) {
3141 FREE_C_HEAP_ARRAY(char, buf);
3142 jio_fprintf(defaultStream::error_stream(),
3143 "Could not read options file '%s'\n", file_name);
3144 return JNI_ERR;
3145 }
3146
3147 if (bytes_read == 0) {
3148 // tell caller there is no option data and that is ok
3149 FREE_C_HEAP_ARRAY(char, buf);
3150 return JNI_OK;
3151 }
3152
3153 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3154
3155 FREE_C_HEAP_ARRAY(char, buf);
3156 return retcode;
3157 }
3158
3159 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3160 // Construct option array
3161 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3162
3163 // some pointers to help with parsing
3164 char *buffer_end = buffer + buf_len;
3165 char *opt_hd = buffer;
3166 char *wrt = buffer;
3167 char *rd = buffer;
3168
3169 // parse all options
3170 while (rd < buffer_end) {
3171 // skip leading white space from the input string
3172 while (rd < buffer_end && isspace(*rd)) {
3173 rd++;
3174 }
3175
3176 if (rd >= buffer_end) {
3177 break;
3178 }
3179
3180 // Remember this is where we found the head of the token.
3181 opt_hd = wrt;
3182
3183 // Tokens are strings of non white space characters separated
3184 // by one or more white spaces.
3185 while (rd < buffer_end && !isspace(*rd)) {
3186 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3187 int quote = *rd; // matching quote to look for
3188 rd++; // don't copy open quote
3189 while (rd < buffer_end && *rd != quote) {
3190 // include everything (even spaces)
3191 // up until the close quote
3192 *wrt++ = *rd++; // copy to option string
3193 }
3194
3195 if (rd < buffer_end) {
3196 rd++; // don't copy close quote
3197 } else {
3198 // did not see closing quote
3199 jio_fprintf(defaultStream::error_stream(),
3200 "Unmatched quote in %s\n", name);
3201 return JNI_ERR;
3202 }
3203 } else {
3204 *wrt++ = *rd++; // copy to option string
3205 }
3206 }
3207
3208 // steal a white space character and set it to null
3209 *wrt++ = '\0';
3210 // We now have a complete token
3211
3212 JavaVMOption option;
3213 option.optionString = opt_hd;
3214 option.extraInfo = nullptr;
3215
3216 options.append(option); // Fill in option
3217
3218 rd++; // Advance to next character
3219 }
3220
3221 // Fill out JavaVMInitArgs structure.
3222 return vm_args->set_args(&options);
3223 }
3224
3225 #ifndef PRODUCT
3226 // Determine whether LogVMOutput should be implicitly turned on.
3227 static bool use_vm_log() {
3228 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3229 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3230 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3231 PrintAssembly || TraceDeoptimization ||
3232 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3233 return true;
3234 }
3235
3236 #ifdef COMPILER1
3237 if (PrintC1Statistics) {
3238 return true;
3239 }
3240 #endif // COMPILER1
3241
3242 #ifdef COMPILER2
3243 if (PrintOptoAssembly || PrintOptoStatistics) {
3244 return true;
3245 }
3246 #endif // COMPILER2
3247
3248 return false;
3249 }
3250
3251 #endif // PRODUCT
3252
3253 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3254 for (int index = 0; index < args->nOptions; index++) {
3255 const JavaVMOption* option = args->options + index;
3256 const char* tail;
3257 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3258 return true;
3259 }
3260 }
3261 return false;
3262 }
3263
3264 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3265 const char* vm_options_file,
3266 const int vm_options_file_pos,
3267 ScopedVMInitArgs* vm_options_file_args,
3268 ScopedVMInitArgs* args_out) {
3269 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3270 if (code != JNI_OK) {
3271 return code;
3272 }
3273
3274 if (vm_options_file_args->get()->nOptions < 1) {
3275 return JNI_OK;
3276 }
3277
3278 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3279 jio_fprintf(defaultStream::error_stream(),
3280 "A VM options file may not refer to a VM options file. "
3281 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3282 "options file '%s' in options container '%s' is an error.\n",
3283 vm_options_file_args->vm_options_file_arg(),
3284 vm_options_file_args->container_name());
3285 return JNI_EINVAL;
3286 }
3287
3288 return args_out->insert(args, vm_options_file_args->get(),
3289 vm_options_file_pos);
3290 }
3291
3292 // Expand -XX:VMOptionsFile found in args_in as needed.
3293 // mod_args and args_out parameters may return values as needed.
3294 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3295 ScopedVMInitArgs* mod_args,
3296 JavaVMInitArgs** args_out) {
3297 jint code = match_special_option_and_act(args_in, mod_args);
3298 if (code != JNI_OK) {
3299 return code;
3300 }
3301
3302 if (mod_args->is_set()) {
3303 // args_in contains -XX:VMOptionsFile and mod_args contains the
3304 // original options from args_in along with the options expanded
3305 // from the VMOptionsFile. Return a short-hand to the caller.
3306 *args_out = mod_args->get();
3307 } else {
3308 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3309 }
3310 return JNI_OK;
3311 }
3312
3313 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3314 ScopedVMInitArgs* args_out) {
3315 // Remaining part of option string
3316 const char* tail;
3317 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3318
3319 for (int index = 0; index < args->nOptions; index++) {
3320 const JavaVMOption* option = args->options + index;
3321 if (match_option(option, "-XX:Flags=", &tail)) {
3322 Arguments::set_jvm_flags_file(tail);
3323 continue;
3324 }
3325 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3326 if (vm_options_file_args.found_vm_options_file_arg()) {
3327 jio_fprintf(defaultStream::error_stream(),
3328 "The option '%s' is already specified in the options "
3329 "container '%s' so the specification of '%s' in the "
3330 "same options container is an error.\n",
3331 vm_options_file_args.vm_options_file_arg(),
3332 vm_options_file_args.container_name(),
3333 option->optionString);
3334 return JNI_EINVAL;
3335 }
3336 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3337 // If there's a VMOptionsFile, parse that
3338 jint code = insert_vm_options_file(args, tail, index,
3339 &vm_options_file_args, args_out);
3340 if (code != JNI_OK) {
3341 return code;
3342 }
3343 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3344 if (args_out->is_set()) {
3345 // The VMOptions file inserted some options so switch 'args'
3346 // to the new set of options, and continue processing which
3347 // preserves "last option wins" semantics.
3348 args = args_out->get();
3349 // The first option from the VMOptionsFile replaces the
3350 // current option. So we back track to process the
3351 // replacement option.
3352 index--;
3353 }
3354 continue;
3355 }
3356 if (match_option(option, "-XX:+PrintVMOptions")) {
3357 PrintVMOptions = true;
3358 continue;
3359 }
3360 if (match_option(option, "-XX:-PrintVMOptions")) {
3361 PrintVMOptions = false;
3362 continue;
3363 }
3364 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3365 IgnoreUnrecognizedVMOptions = true;
3366 continue;
3367 }
3368 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3369 IgnoreUnrecognizedVMOptions = false;
3370 continue;
3371 }
3372 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3373 JVMFlag::printFlags(tty, false);
3374 vm_exit(0);
3375 }
3376
3377 #ifndef PRODUCT
3378 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3379 JVMFlag::printFlags(tty, true);
3380 vm_exit(0);
3381 }
3382 #endif
3383 }
3384 return JNI_OK;
3385 }
3386
3387 static void print_options(const JavaVMInitArgs *args) {
3388 const char* tail;
3389 for (int index = 0; index < args->nOptions; index++) {
3390 const JavaVMOption *option = args->options + index;
3391 if (match_option(option, "-XX:", &tail)) {
3392 logOption(tail);
3393 }
3394 }
3395 }
3396
3397 bool Arguments::handle_deprecated_print_gc_flags() {
3398 if (PrintGC) {
3399 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3400 }
3401 if (PrintGCDetails) {
3402 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3403 }
3404
3405 if (_legacyGCLogging.lastFlag == 2) {
3406 // -Xloggc was used to specify a filename
3407 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3408
3409 LogTarget(Error, logging) target;
3410 LogStream errstream(target);
3411 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3412 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3413 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3414 }
3415 return true;
3416 }
3417
3418 static void apply_debugger_ergo() {
3419 #ifdef ASSERT
3420 if (ReplayCompiles) {
3421 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3422 }
3423
3424 if (UseDebuggerErgo) {
3425 // Turn on sub-flags
3426 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3427 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3428 }
3429
3430 if (UseDebuggerErgo2) {
3431 // Debugging with limited number of CPUs
3432 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3433 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3434 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3435 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3436 }
3437 #endif // ASSERT
3438 }
3439
3440 // Parse entry point called from JNI_CreateJavaVM
3441
3442 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3443 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3444 JVMFlag::check_all_flag_declarations();
3445
3446 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3447 const char* hotspotrc = ".hotspotrc";
3448 bool settings_file_specified = false;
3449 bool needs_hotspotrc_warning = false;
3450 ScopedVMInitArgs initial_vm_options_args("");
3451 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3452 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3453
3454 // Pointers to current working set of containers
3455 JavaVMInitArgs* cur_cmd_args;
3456 JavaVMInitArgs* cur_vm_options_args;
3457 JavaVMInitArgs* cur_java_options_args;
3458 JavaVMInitArgs* cur_java_tool_options_args;
3459
3460 // Containers for modified/expanded options
3461 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3462 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3463 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3464 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3465
3466
3467 jint code =
3468 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3469 if (code != JNI_OK) {
3470 return code;
3471 }
3472
3473 code = parse_java_options_environment_variable(&initial_java_options_args);
3474 if (code != JNI_OK) {
3475 return code;
3476 }
3477
3478 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3479 char *vmoptions = ClassLoader::lookup_vm_options();
3480 if (vmoptions != nullptr) {
3481 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3482 FREE_C_HEAP_ARRAY(char, vmoptions);
3483 if (code != JNI_OK) {
3484 return code;
3485 }
3486 }
3487
3488 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3489 &mod_java_tool_options_args,
3490 &cur_java_tool_options_args);
3491 if (code != JNI_OK) {
3492 return code;
3493 }
3494
3495 code = expand_vm_options_as_needed(initial_cmd_args,
3496 &mod_cmd_args,
3497 &cur_cmd_args);
3498 if (code != JNI_OK) {
3499 return code;
3500 }
3501
3502 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3503 &mod_java_options_args,
3504 &cur_java_options_args);
3505 if (code != JNI_OK) {
3506 return code;
3507 }
3508
3509 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3510 &mod_vm_options_args,
3511 &cur_vm_options_args);
3512 if (code != JNI_OK) {
3513 return code;
3514 }
3515
3516 const char* flags_file = Arguments::get_jvm_flags_file();
3517 settings_file_specified = (flags_file != nullptr);
3518
3519 if (IgnoreUnrecognizedVMOptions) {
3520 cur_cmd_args->ignoreUnrecognized = true;
3521 cur_java_tool_options_args->ignoreUnrecognized = true;
3522 cur_java_options_args->ignoreUnrecognized = true;
3523 }
3524
3525 // Parse specified settings file
3526 if (settings_file_specified) {
3527 if (!process_settings_file(flags_file, true,
3528 cur_cmd_args->ignoreUnrecognized)) {
3529 return JNI_EINVAL;
3530 }
3531 } else {
3532 #ifdef ASSERT
3533 // Parse default .hotspotrc settings file
3534 if (!process_settings_file(".hotspotrc", false,
3535 cur_cmd_args->ignoreUnrecognized)) {
3536 return JNI_EINVAL;
3537 }
3538 #else
3539 struct stat buf;
3540 if (os::stat(hotspotrc, &buf) == 0) {
3541 needs_hotspotrc_warning = true;
3542 }
3543 #endif
3544 }
3545
3546 if (PrintVMOptions) {
3547 print_options(cur_java_tool_options_args);
3548 print_options(cur_cmd_args);
3549 print_options(cur_java_options_args);
3550 }
3551
3552 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3553 jint result = parse_vm_init_args(cur_vm_options_args,
3554 cur_java_tool_options_args,
3555 cur_java_options_args,
3556 cur_cmd_args);
3557
3558 if (result != JNI_OK) {
3559 return result;
3560 }
3561
3562 // Delay warning until here so that we've had a chance to process
3563 // the -XX:-PrintWarnings flag
3564 if (needs_hotspotrc_warning) {
3565 warning("%s file is present but has been ignored. "
3566 "Run with -XX:Flags=%s to load the file.",
3567 hotspotrc, hotspotrc);
3568 }
3569
3570 if (needs_module_property_warning) {
3571 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3572 " names that are reserved for internal use.");
3573 }
3574
3575 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3576 UNSUPPORTED_OPTION(UseLargePages);
3577 #endif
3578
3579 #if defined(AIX)
3580 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3581 #endif
3582
3583 #ifndef PRODUCT
3584 if (TraceBytecodesAt != 0) {
3585 TraceBytecodes = true;
3586 }
3587 #endif // PRODUCT
3588
3589 if (ScavengeRootsInCode == 0) {
3590 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3591 warning("Forcing ScavengeRootsInCode non-zero");
3592 }
3593 ScavengeRootsInCode = 1;
3594 }
3595
3596 if (!handle_deprecated_print_gc_flags()) {
3597 return JNI_EINVAL;
3598 }
3599
3600 // Set object alignment values.
3601 set_object_alignment();
3602
3603 #if !INCLUDE_CDS
3604 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3605 jio_fprintf(defaultStream::error_stream(),
3606 "Shared spaces are not supported in this VM\n");
3607 return JNI_ERR;
3608 }
3609 if (DumpLoadedClassList != nullptr) {
3610 jio_fprintf(defaultStream::error_stream(),
3611 "DumpLoadedClassList is not supported in this VM\n");
3612 return JNI_ERR;
3613 }
3614 if ((UseSharedSpaces && xshare_auto_cmd_line) ||
3615 log_is_enabled(Info, cds)) {
3616 warning("Shared spaces are not supported in this VM");
3617 UseSharedSpaces = false;
3618 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3619 }
3620 no_shared_spaces("CDS Disabled");
3621 #endif // INCLUDE_CDS
3622
3623 // Verify NMT arguments
3624 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3625 if (lvl == NMT_unknown) {
3626 jio_fprintf(defaultStream::error_stream(),
3627 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3628 return JNI_ERR;
3629 }
3630 if (PrintNMTStatistics && lvl == NMT_off) {
3631 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3632 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3633 }
3634
3635 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3636 if (trace_dependencies && VerifyDependencies) {
3637 warning("dependency logging results may be inflated by VerifyDependencies");
3638 }
3639
3640 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3641 log_is_enabled(Info, class, load, cause);
3642 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3643 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3644 }
3645
3646 apply_debugger_ergo();
3647
3648 if (log_is_enabled(Info, arguments)) {
3649 LogStream st(Log(arguments)::info());
3650 Arguments::print_on(&st);
3651 }
3652
3653 return JNI_OK;
3654 }
3655
3656 jint Arguments::apply_ergo() {
3657 // Set flags based on ergonomics.
3658 jint result = set_ergonomics_flags();
3659 if (result != JNI_OK) return result;
3660
3661 // Set heap size based on available physical memory
3662 set_heap_size();
3663
3664 GCConfig::arguments()->initialize();
3665
3666 CDSConfig::initialize();
3667
3668 // Initialize Metaspace flags and alignments
3669 Metaspace::ergo_initialize();
3670
3671 if (!StringDedup::ergo_initialize()) {
3672 return JNI_EINVAL;
3673 }
3674
3675 // Set compiler flags after GC is selected and GC specific
3676 // flags (LoopStripMiningIter) are set.
3677 CompilerConfig::ergo_initialize();
3678
3679 // Set bytecode rewriting flags
3680 set_bytecode_flags();
3681
3682 // Set flags if aggressive optimization flags are enabled
3683 jint code = set_aggressive_opts_flags();
3684 if (code != JNI_OK) {
3685 return code;
3686 }
3687
3688 #ifdef ZERO
3689 // Clear flags not supported on zero.
3690 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3691 #endif // ZERO
3692
3693 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3694 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3695 DebugNonSafepoints = true;
3696 }
3697
3698 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3699 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3700 }
3701
3702 // Treat the odd case where local verification is enabled but remote
3703 // verification is not as if both were enabled.
3704 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3705 log_info(verification)("Turning on remote verification because local verification is on");
3706 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3707 }
3708
3709 #ifndef PRODUCT
3710 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3711 if (use_vm_log()) {
3712 LogVMOutput = true;
3713 }
3714 }
3715 #endif // PRODUCT
3716
3717 if (PrintCommandLineFlags) {
3718 JVMFlag::printSetFlags(tty);
3719 }
3720
3721 #if COMPILER2_OR_JVMCI
3722 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3723 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3724 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3725 }
3726 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3727
3728 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3729 if (!EnableVectorReboxing) {
3730 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3731 } else {
3732 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3733 }
3734 }
3735 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3736
3737 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
3738 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
3739 }
3740 FLAG_SET_DEFAULT(UseVectorStubs, false);
3741 }
3742 #endif // COMPILER2_OR_JVMCI
3743
3744 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3745 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3746 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3747 }
3748 }
3749 return JNI_OK;
3750 }
3751
3752 jint Arguments::adjust_after_os() {
3753 if (UseNUMA) {
3754 if (UseParallelGC) {
3755 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3756 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3757 }
3758 }
3759 }
3760 return JNI_OK;
3761 }
3762
3763 int Arguments::PropertyList_count(SystemProperty* pl) {
3764 int count = 0;
3765 while(pl != nullptr) {
3766 count++;
3767 pl = pl->next();
3768 }
3769 return count;
3770 }
3771
3772 // Return the number of readable properties.
3773 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3774 int count = 0;
3775 while(pl != nullptr) {
3776 if (pl->readable()) {
3777 count++;
3778 }
3779 pl = pl->next();
3780 }
3781 return count;
3782 }
3783
3784 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3785 assert(key != nullptr, "just checking");
3786 SystemProperty* prop;
3787 for (prop = pl; prop != nullptr; prop = prop->next()) {
3788 if (strcmp(key, prop->key()) == 0) return prop->value();
3789 }
3790 return nullptr;
3791 }
3792
3793 // Return the value of the requested property provided that it is a readable property.
3794 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3795 assert(key != nullptr, "just checking");
3796 SystemProperty* prop;
3797 // Return the property value if the keys match and the property is not internal or
3798 // it's the special internal property "jdk.boot.class.path.append".
3799 for (prop = pl; prop != nullptr; prop = prop->next()) {
3800 if (strcmp(key, prop->key()) == 0) {
3801 if (!prop->internal()) {
3802 return prop->value();
3803 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3804 return prop->value();
3805 } else {
3806 // Property is internal and not jdk.boot.class.path.append so return null.
3807 return nullptr;
3808 }
3809 }
3810 }
3811 return nullptr;
3812 }
3813
3814 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3815 SystemProperty* p = *plist;
3816 if (p == nullptr) {
3817 *plist = new_p;
3818 } else {
3819 while (p->next() != nullptr) {
3820 p = p->next();
3821 }
3822 p->set_next(new_p);
3823 }
3824 }
3825
3826 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3827 bool writeable, bool internal) {
3828 if (plist == nullptr)
3829 return;
3830
3831 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3832 PropertyList_add(plist, new_p);
3833 }
3834
3835 void Arguments::PropertyList_add(SystemProperty *element) {
3836 PropertyList_add(&_system_properties, element);
3837 }
3838
3839 // This add maintains unique property key in the list.
3840 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3841 PropertyAppendable append, PropertyWriteable writeable,
3842 PropertyInternal internal) {
3843 if (plist == nullptr)
3844 return;
3845
3846 // If property key exists and is writeable, then update with new value.
3847 // Trying to update a non-writeable property is silently ignored.
3848 SystemProperty* prop;
3849 for (prop = *plist; prop != nullptr; prop = prop->next()) {
3850 if (strcmp(k, prop->key()) == 0) {
3851 if (append == AppendProperty) {
3852 prop->append_writeable_value(v);
3853 } else {
3854 prop->set_writeable_value(v);
3855 }
3856 return;
3857 }
3858 }
3859
3860 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3861 }
3862
3863 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3864 // Returns true if all of the source pointed by src has been copied over to
3865 // the destination buffer pointed by buf. Otherwise, returns false.
3866 // Notes:
3867 // 1. If the length (buflen) of the destination buffer excluding the
3868 // null terminator character is not long enough for holding the expanded
3869 // pid characters, it also returns false instead of returning the partially
3870 // expanded one.
3871 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3872 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3873 char* buf, size_t buflen) {
3874 const char* p = src;
3875 char* b = buf;
3876 const char* src_end = &src[srclen];
3877 char* buf_end = &buf[buflen - 1];
3878
3879 while (p < src_end && b < buf_end) {
3880 if (*p == '%') {
3881 switch (*(++p)) {
3882 case '%': // "%%" ==> "%"
3883 *b++ = *p++;
3884 break;
3885 case 'p': { // "%p" ==> current process id
3886 // buf_end points to the character before the last character so
3887 // that we could write '\0' to the end of the buffer.
3888 size_t buf_sz = buf_end - b + 1;
3889 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3890
3891 // if jio_snprintf fails or the buffer is not long enough to hold
3892 // the expanded pid, returns false.
3893 if (ret < 0 || ret >= (int)buf_sz) {
3894 return false;
3895 } else {
3896 b += ret;
3897 assert(*b == '\0', "fail in copy_expand_pid");
3898 if (p == src_end && b == buf_end + 1) {
3899 // reach the end of the buffer.
3900 return true;
3901 }
3902 }
3903 p++;
3904 break;
3905 }
3906 default :
3907 *b++ = '%';
3908 }
3909 } else {
3910 *b++ = *p++;
3911 }
3912 }
3913 *b = '\0';
3914 return (p == src_end); // return false if not all of the source was copied
3915 }