1 /*
2 * Copyright (c) 1997, 2023, 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 char* Arguments::_default_shared_archive_path = nullptr;
105 char* Arguments::SharedArchivePath = nullptr;
106 char* Arguments::SharedDynamicArchivePath = nullptr;
107
108 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 };
109
110 // These are not set by the JDK's built-in launchers, but they can be set by
111 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
112 // JavaVMOption in jni.h.
113 abort_hook_t Arguments::_abort_hook = nullptr;
114 exit_hook_t Arguments::_exit_hook = nullptr;
115 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
116
117
118 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
119 SystemProperty *Arguments::_java_library_path = nullptr;
120 SystemProperty *Arguments::_java_home = nullptr;
121 SystemProperty *Arguments::_java_class_path = nullptr;
122 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
123 SystemProperty *Arguments::_vm_info = nullptr;
124
125 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
126 PathString *Arguments::_boot_class_path = nullptr;
127 bool Arguments::_has_jimage = false;
128
129 char* Arguments::_ext_dirs = nullptr;
130
131 // True if -Xshare:auto option was specified.
132 static bool xshare_auto_cmd_line = false;
133
134 // True if -Xint/-Xmixed/-Xcomp were specified
135 static bool mode_flag_cmd_line = false;
136
137 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
138 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
139 if (new_value == nullptr) {
140 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
141 return false;
142 }
143 if (_value != nullptr) {
144 FreeHeap(_value);
145 }
146 _value = new_value;
147 strcpy(_value, value);
148 return true;
149 }
150
151 void PathString::append_value(const char *value) {
152 char *sp;
153 size_t len = 0;
154 if (value != nullptr) {
155 len = strlen(value);
156 if (_value != nullptr) {
157 len += strlen(_value);
158 }
159 sp = AllocateHeap(len+2, mtArguments);
160 assert(sp != nullptr, "Unable to allocate space for new append path value");
161 if (sp != nullptr) {
162 if (_value != nullptr) {
163 strcpy(sp, _value);
164 strcat(sp, os::path_separator());
165 strcat(sp, value);
166 FreeHeap(_value);
167 } else {
168 strcpy(sp, value);
169 }
170 _value = sp;
171 }
172 }
173 }
174
175 PathString::PathString(const char* value) {
176 if (value == nullptr) {
177 _value = nullptr;
178 } else {
179 _value = AllocateHeap(strlen(value)+1, mtArguments);
180 strcpy(_value, value);
181 }
182 }
183
184 PathString::~PathString() {
185 if (_value != nullptr) {
186 FreeHeap(_value);
187 _value = nullptr;
188 }
189 }
190
191 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
192 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
193 size_t len = strlen(module_name) + 1;
194 _module_name = AllocateHeap(len, mtInternal);
195 strncpy(_module_name, module_name, len); // copy the trailing null
196 _path = new PathString(path);
197 }
198
199 ModulePatchPath::~ModulePatchPath() {
200 if (_module_name != nullptr) {
201 FreeHeap(_module_name);
202 _module_name = nullptr;
203 }
204 if (_path != nullptr) {
205 delete _path;
206 _path = nullptr;
207 }
208 }
209
210 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
211 if (key == nullptr) {
212 _key = nullptr;
213 } else {
214 _key = AllocateHeap(strlen(key)+1, mtArguments);
215 strcpy(_key, key);
216 }
217 _next = nullptr;
218 _internal = internal;
219 _writeable = writeable;
220 }
221
222 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
223 // part of the option string.
224 static bool match_option(const JavaVMOption *option, const char* name,
225 const char** tail) {
226 size_t len = strlen(name);
227 if (strncmp(option->optionString, name, len) == 0) {
228 *tail = option->optionString + len;
229 return true;
230 } else {
231 return false;
232 }
233 }
234
235 // Check if 'option' matches 'name'. No "tail" is allowed.
236 static bool match_option(const JavaVMOption *option, const char* name) {
237 const char* tail = nullptr;
238 bool result = match_option(option, name, &tail);
239 if (tail != nullptr && *tail == '\0') {
240 return result;
241 } else {
242 return false;
243 }
244 }
245
246 // Return true if any of the strings in null-terminated array 'names' matches.
247 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
248 // the option must match exactly.
249 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
250 bool tail_allowed) {
251 for (/* empty */; *names != nullptr; ++names) {
252 if (match_option(option, *names, tail)) {
253 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
254 return true;
255 }
256 }
257 }
258 return false;
259 }
260
261 #if INCLUDE_JFR
262 static bool _has_jfr_option = false; // is using JFR
263
264 // return true on failure
265 static bool match_jfr_option(const JavaVMOption** option) {
266 assert((*option)->optionString != nullptr, "invariant");
267 char* tail = nullptr;
268 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
269 _has_jfr_option = true;
270 return Jfr::on_start_flight_recording_option(option, tail);
271 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
272 _has_jfr_option = true;
273 return Jfr::on_flight_recorder_option(option, tail);
274 }
275 return false;
276 }
277
278 bool Arguments::has_jfr_option() {
279 return _has_jfr_option;
280 }
281 #endif
282
283 static void logOption(const char* opt) {
284 if (PrintVMOptions) {
285 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
286 }
287 }
288
289 bool needs_module_property_warning = false;
290
291 #define MODULE_PROPERTY_PREFIX "jdk.module."
292 #define MODULE_PROPERTY_PREFIX_LEN 11
293 #define ADDEXPORTS "addexports"
294 #define ADDEXPORTS_LEN 10
295 #define ADDREADS "addreads"
296 #define ADDREADS_LEN 8
297 #define ADDOPENS "addopens"
298 #define ADDOPENS_LEN 8
299 #define PATCH "patch"
300 #define PATCH_LEN 5
301 #define ADDMODS "addmods"
302 #define ADDMODS_LEN 7
303 #define LIMITMODS "limitmods"
304 #define LIMITMODS_LEN 9
305 #define PATH "path"
306 #define PATH_LEN 4
307 #define UPGRADE_PATH "upgrade.path"
308 #define UPGRADE_PATH_LEN 12
309 #define ENABLE_NATIVE_ACCESS "enable.native.access"
310 #define ENABLE_NATIVE_ACCESS_LEN 20
311
312 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
313 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
314 return ((strncmp(option, property, len) == 0) &&
315 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
316 }
317
318 // Return true if property starts with "jdk.module." and its ensuing chars match
319 // any of the reserved module properties.
320 // property should be passed without the leading "-D".
321 bool Arguments::is_internal_module_property(const char* property) {
322 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
323 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
324 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
325 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
326 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
327 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
328 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
329 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
330 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
331 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
332 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
333 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
334 return true;
335 }
336 }
337 return false;
338 }
339
340 // Process java launcher properties.
341 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
342 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
343 // Must do this before setting up other system properties,
344 // as some of them may depend on launcher type.
345 for (int index = 0; index < args->nOptions; index++) {
346 const JavaVMOption* option = args->options + index;
347 const char* tail;
348
349 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
350 process_java_launcher_argument(tail, option->extraInfo);
351 continue;
352 }
353 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
354 if (strcmp(tail, "true") == 0) {
355 _sun_java_launcher_is_altjvm = true;
356 }
357 continue;
358 }
359 }
360 }
361
362 // Initialize system properties key and value.
363 void Arguments::init_system_properties() {
364
365 // Set up _boot_class_path which is not a property but
366 // relies heavily on argument processing and the jdk.boot.class.path.append
367 // property. It is used to store the underlying boot class path.
368 _boot_class_path = new PathString(nullptr);
369
370 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
371 "Java Virtual Machine Specification", false));
372 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
373 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
374 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
375
376 // Initialize the vm.info now, but it will need updating after argument parsing.
377 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
378
379 // Following are JVMTI agent writable properties.
380 // Properties values are set to nullptr and they are
381 // os specific they are initialized in os::init_system_properties_values().
382 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
383 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
384 _java_home = new SystemProperty("java.home", nullptr, true);
385 _java_class_path = new SystemProperty("java.class.path", "", true);
386 // jdk.boot.class.path.append is a non-writeable, internal property.
387 // It can only be set by either:
388 // - -Xbootclasspath/a:
389 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
390 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
391
392 // Add to System Property list.
393 PropertyList_add(&_system_properties, _sun_boot_library_path);
394 PropertyList_add(&_system_properties, _java_library_path);
395 PropertyList_add(&_system_properties, _java_home);
396 PropertyList_add(&_system_properties, _java_class_path);
397 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
398 PropertyList_add(&_system_properties, _vm_info);
399
400 // Set OS specific system properties values
401 os::init_system_properties_values();
402 }
403
404 // Update/Initialize System properties after JDK version number is known
405 void Arguments::init_version_specific_system_properties() {
406 enum { bufsz = 16 };
407 char buffer[bufsz];
408 const char* spec_vendor = "Oracle Corporation";
409 uint32_t spec_version = JDK_Version::current().major_version();
410
411 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
412
413 PropertyList_add(&_system_properties,
414 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
415 PropertyList_add(&_system_properties,
416 new SystemProperty("java.vm.specification.version", buffer, false));
417 PropertyList_add(&_system_properties,
418 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
419 }
420
421 /*
422 * -XX argument processing:
423 *
424 * -XX arguments are defined in several places, such as:
425 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
426 * -XX arguments are parsed in parse_argument().
427 * -XX argument bounds checking is done in check_vm_args_consistency().
428 *
429 * Over time -XX arguments may change. There are mechanisms to handle common cases:
430 *
431 * ALIASED: An option that is simply another name for another option. This is often
432 * part of the process of deprecating a flag, but not all aliases need
433 * to be deprecated.
434 *
435 * Create an alias for an option by adding the old and new option names to the
436 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
437 *
438 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
439 * support may be removed in the future. Both regular and aliased options may be
440 * deprecated.
441 *
442 * Add a deprecation warning for an option (or alias) by adding an entry in the
443 * "special_jvm_flags" table and setting the "deprecated_in" field.
444 * Often an option "deprecated" in one major release will
445 * be made "obsolete" in the next. In this case the entry should also have its
446 * "obsolete_in" field set.
447 *
448 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
449 * on the command line. A warning is printed to let the user know that option might not
450 * be accepted in the future.
451 *
452 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
453 * table and setting the "obsolete_in" field.
454 *
455 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
456 * to the current JDK version. The system will flatly refuse to admit the existence of
457 * the flag. This allows a flag to die automatically over JDK releases.
458 *
459 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
460 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
461 * - Newly obsolete or expired deprecated options should have their global variable
462 * definitions removed (from globals.hpp, etc) and related implementations removed.
463 *
464 * Recommended approach for removing options:
465 *
466 * To remove options commonly used by customers (e.g. product -XX options), use
467 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
468 *
469 * To remove internal options (e.g. diagnostic, experimental, develop options), use
470 * a 2-step model adding major release numbers to the obsolete and expire columns.
471 *
472 * To change the name of an option, use the alias table as well as a 2-step
473 * model adding major release numbers to the deprecate and expire columns.
474 * Think twice about aliasing commonly used customer options.
475 *
476 * There are times when it is appropriate to leave a future release number as undefined.
477 *
478 * Tests: Aliases should be tested in VMAliasOptions.java.
479 * Deprecated options should be tested in VMDeprecatedOptions.java.
480 */
481
482 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
483 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
484 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
485 // the command-line as usual, but will issue a warning.
486 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
487 // the command-line, while issuing a warning and ignoring the flag value.
488 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
489 // existence of the flag.
490 //
491 // MANUAL CLEANUP ON JDK VERSION UPDATES:
492 // This table ensures that the handling of options will update automatically when the JDK
493 // version is incremented, but the source code needs to be cleanup up manually:
494 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
495 // variable should be removed, as well as users of the variable.
496 // - As "deprecated" options age into "obsolete" options, move the entry into the
497 // "Obsolete Flags" section of the table.
498 // - All expired options should be removed from the table.
499 static SpecialFlag const special_jvm_flags[] = {
500 // -------------- Deprecated Flags --------------
501 // --- Non-alias flags - sorted by obsolete_in then expired_in:
502 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
503 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
504 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
505 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
506 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
507 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
508 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
509 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
510 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
511 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
512
513 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
514 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
515 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
516 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
517
518 // -------------- Obsolete Flags - sorted by expired_in --------------
519
520 { "G1ConcRefinementGreenZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
521 { "G1ConcRefinementYellowZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
522 { "G1ConcRefinementRedZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
523 { "G1ConcRefinementThresholdStep", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
524 { "G1UseAdaptiveConcRefinement", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
525 { "G1ConcRefinementServiceIntervalMillis", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
526
527 { "G1ConcRSLogCacheSize", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
528 { "G1ConcRSHotCardLimit", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
529 { "RefDiscoveryPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
530 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
531 { "DoReserveCopyInSuperWord", JDK_Version::undefined(), JDK_Version::jdk(22), JDK_Version::jdk(23) },
532 { "UseCounterDecay", JDK_Version::undefined(), JDK_Version::jdk(22), JDK_Version::jdk(23) },
533
534 #ifdef LINUX
535 { "UseHugeTLBFS", JDK_Version::undefined(), JDK_Version::jdk(22), JDK_Version::jdk(23) },
536 { "UseSHM", JDK_Version::undefined(), JDK_Version::jdk(22), JDK_Version::jdk(23) },
537 #endif
538
539 #ifdef ASSERT
540 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
541 #endif
542
543 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
544 // These entries will generate build errors. Their purpose is to test the macros.
545 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
546 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
547 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
548 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
549 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
550 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
551 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
552 #endif
553
554 { nullptr, JDK_Version(0), JDK_Version(0) }
555 };
556
557 // Flags that are aliases for other flags.
558 typedef struct {
559 const char* alias_name;
560 const char* real_name;
561 } AliasedFlag;
562
563 static AliasedFlag const aliased_jvm_flags[] = {
564 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
565 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
566 { nullptr, nullptr}
567 };
568
569 // Return true if "v" is less than "other", where "other" may be "undefined".
570 static bool version_less_than(JDK_Version v, JDK_Version other) {
571 assert(!v.is_undefined(), "must be defined");
572 if (!other.is_undefined() && v.compare(other) >= 0) {
573 return false;
574 } else {
575 return true;
576 }
577 }
578
579 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
580 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
581 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
582 flag = special_jvm_flags[i];
583 return true;
584 }
585 }
586 return false;
587 }
588
589 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
590 assert(version != nullptr, "Must provide a version buffer");
591 SpecialFlag flag;
592 if (lookup_special_flag(flag_name, flag)) {
593 if (!flag.obsolete_in.is_undefined()) {
594 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
595 *version = flag.obsolete_in;
596 // This flag may have been marked for obsoletion in this version, but we may not
597 // have actually removed it yet. Rather than ignoring it as soon as we reach
598 // this version we allow some time for the removal to happen. So if the flag
599 // still actually exists we process it as normal, but issue an adjusted warning.
600 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
601 if (real_flag != nullptr) {
602 char version_str[256];
603 version->to_string(version_str, sizeof(version_str));
604 warning("Temporarily processing option %s; support is scheduled for removal in %s",
605 flag_name, version_str);
606 return false;
607 }
608 return true;
609 }
610 }
611 }
612 return false;
613 }
614
615 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
616 assert(version != nullptr, "Must provide a version buffer");
617 SpecialFlag flag;
618 if (lookup_special_flag(flag_name, flag)) {
619 if (!flag.deprecated_in.is_undefined()) {
620 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
621 version_less_than(JDK_Version::current(), flag.expired_in)) {
622 *version = flag.deprecated_in;
623 return 1;
624 } else {
625 return -1;
626 }
627 }
628 }
629 return 0;
630 }
631
632 const char* Arguments::real_flag_name(const char *flag_name) {
633 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
634 const AliasedFlag& flag_status = aliased_jvm_flags[i];
635 if (strcmp(flag_status.alias_name, flag_name) == 0) {
636 return flag_status.real_name;
637 }
638 }
639 return flag_name;
640 }
641
642 #ifdef ASSERT
643 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
644 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
645 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
646 return true;
647 }
648 }
649 return false;
650 }
651
652 // Verifies the correctness of the entries in the special_jvm_flags table.
653 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
654 // version being earlier than the deprecation version, then a warning is issued
655 // and verification fails - by returning false. If it is detected that the table
656 // is out of date, with respect to the current version, then ideally a warning is
657 // issued but verification does not fail. This allows the VM to operate when the
658 // version is first updated, without needing to update all the impacted flags at
659 // the same time. In practice we can't issue the warning immediately when the version
660 // is updated as it occurs for every test and some tests are not prepared to handle
661 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
662 // if the check_globals flag is true, and in addition allow a grace period and only
663 // check for stale flags when we hit build 25 (which is far enough into the 6 month
664 // release cycle that all flag updates should have been processed, whilst still
665 // leaving time to make the change before RDP2).
666 // We use a gtest to call this, passing true, so that we can detect stale flags before
667 // the end of the release cycle.
668
669 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
670
671 bool Arguments::verify_special_jvm_flags(bool check_globals) {
672 bool success = true;
673 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
674 const SpecialFlag& flag = special_jvm_flags[i];
675 if (lookup_special_flag(flag.name, i)) {
676 warning("Duplicate special flag declaration \"%s\"", flag.name);
677 success = false;
678 }
679 if (flag.deprecated_in.is_undefined() &&
680 flag.obsolete_in.is_undefined()) {
681 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
682 success = false;
683 }
684
685 if (!flag.deprecated_in.is_undefined()) {
686 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
687 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
688 success = false;
689 }
690
691 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
692 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
693 success = false;
694 }
695 }
696
697 if (!flag.obsolete_in.is_undefined()) {
698 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
699 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
700 success = false;
701 }
702
703 // if flag has become obsolete it should not have a "globals" flag defined anymore.
704 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
705 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
706 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
707 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
708 success = false;
709 }
710 }
711
712 } else if (!flag.expired_in.is_undefined()) {
713 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
714 success = false;
715 }
716
717 if (!flag.expired_in.is_undefined()) {
718 // if flag has become expired it should not have a "globals" flag defined anymore.
719 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
720 !version_less_than(JDK_Version::current(), flag.expired_in)) {
721 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
722 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
723 success = false;
724 }
725 }
726 }
727 }
728 return success;
729 }
730 #endif
731
732 bool Arguments::atojulong(const char *s, julong* result) {
733 return parse_integer(s, result);
734 }
735
736 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
737 if (size < min_size) return arg_too_small;
738 if (size > max_size) return arg_too_big;
739 return arg_in_range;
740 }
741
742 // Describe an argument out of range error
743 void Arguments::describe_range_error(ArgsRange errcode) {
744 switch(errcode) {
745 case arg_too_big:
746 jio_fprintf(defaultStream::error_stream(),
747 "The specified size exceeds the maximum "
748 "representable size.\n");
749 break;
750 case arg_too_small:
751 case arg_unreadable:
752 case arg_in_range:
753 // do nothing for now
754 break;
755 default:
756 ShouldNotReachHere();
757 }
758 }
759
760 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
761 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
762 return true;
763 } else {
764 return false;
765 }
766 }
767
768 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
769 // strtod allows leading whitespace, but our flag format does not.
770 if (*value == '\0' || isspace(*value)) {
771 return false;
772 }
773 char* end;
774 errno = 0;
775 double v = strtod(value, &end);
776 if ((errno != 0) || (*end != 0)) {
777 return false;
778 }
779 if (g_isnan(v) || !g_isfinite(v)) {
780 // Currently we cannot handle these special values.
781 return false;
782 }
783
784 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
785 return true;
786 }
787 return false;
788 }
789
790 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
791 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
792
793 if (flag->is_int()) {
794 int v;
795 if (parse_integer(value, &v)) {
796 result = JVMFlagAccess::set_int(flag, &v, origin);
797 }
798 } else if (flag->is_uint()) {
799 uint v;
800 if (parse_integer(value, &v)) {
801 result = JVMFlagAccess::set_uint(flag, &v, origin);
802 }
803 } else if (flag->is_intx()) {
804 intx v;
805 if (parse_integer(value, &v)) {
806 result = JVMFlagAccess::set_intx(flag, &v, origin);
807 }
808 } else if (flag->is_uintx()) {
809 uintx v;
810 if (parse_integer(value, &v)) {
811 result = JVMFlagAccess::set_uintx(flag, &v, origin);
812 }
813 } else if (flag->is_uint64_t()) {
814 uint64_t v;
815 if (parse_integer(value, &v)) {
816 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
817 }
818 } else if (flag->is_size_t()) {
819 size_t v;
820 if (parse_integer(value, &v)) {
821 result = JVMFlagAccess::set_size_t(flag, &v, origin);
822 }
823 }
824
825 return result == JVMFlag::SUCCESS;
826 }
827
828 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
829 if (value[0] == '\0') {
830 value = nullptr;
831 }
832 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
833 // Contract: JVMFlag always returns a pointer that needs freeing.
834 FREE_C_HEAP_ARRAY(char, value);
835 return true;
836 }
837
838 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
839 const char* old_value = "";
840 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
841 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
842 size_t new_len = strlen(new_value);
843 const char* value;
844 char* free_this_too = nullptr;
845 if (old_len == 0) {
846 value = new_value;
847 } else if (new_len == 0) {
848 value = old_value;
849 } else {
850 size_t length = old_len + 1 + new_len + 1;
851 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
852 // each new setting adds another LINE to the switch:
853 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
854 value = buf;
855 free_this_too = buf;
856 }
857 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
858 // JVMFlag always returns a pointer that needs freeing.
859 FREE_C_HEAP_ARRAY(char, value);
860 // JVMFlag made its own copy, so I must delete my own temp. buffer.
861 FREE_C_HEAP_ARRAY(char, free_this_too);
862 return true;
863 }
864
865 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
866 const char* real_name = real_flag_name(arg);
867 JDK_Version since = JDK_Version();
868 switch (is_deprecated_flag(arg, &since)) {
869 case -1: {
870 // Obsolete or expired, so don't process normally,
871 // but allow for an obsolete flag we're still
872 // temporarily allowing.
873 if (!is_obsolete_flag(arg, &since)) {
874 return real_name;
875 }
876 // Note if we're not considered obsolete then we can't be expired either
877 // as obsoletion must come first.
878 return nullptr;
879 }
880 case 0:
881 return real_name;
882 case 1: {
883 char version[256];
884 since.to_string(version, sizeof(version));
885 if (real_name != arg) {
886 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
887 arg, version, real_name);
888 } else {
889 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
890 arg, version);
891 }
892 return real_name;
893 }
894 }
895 ShouldNotReachHere();
896 return nullptr;
897 }
898
899 #define BUFLEN 255
900
901 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
902 char name_copied[BUFLEN+1];
903 if (name[name_length] != 0) {
904 if (name_length > BUFLEN) {
905 return nullptr;
906 } else {
907 strncpy(name_copied, name, name_length);
908 name_copied[name_length] = '\0';
909 name = name_copied;
910 }
911 }
912
913 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
914 if (real_name == nullptr) {
915 return nullptr;
916 }
917 JVMFlag* flag = JVMFlag::find_flag(real_name);
918 return flag;
919 }
920
921 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
922 bool is_bool = false;
923 bool bool_val = false;
924 char c = *arg;
925 if (c == '+' || c == '-') {
926 is_bool = true;
927 bool_val = (c == '+');
928 arg++;
929 }
930
931 const char* name = arg;
932 while (true) {
933 c = *arg;
934 if (isalnum(c) || (c == '_')) {
935 ++arg;
936 } else {
937 break;
938 }
939 }
940
941 size_t name_len = size_t(arg - name);
942 if (name_len == 0) {
943 return false;
944 }
945
946 JVMFlag* flag = find_jvm_flag(name, name_len);
947 if (flag == nullptr) {
948 return false;
949 }
950
951 if (is_bool) {
952 if (*arg != 0) {
953 // Error -- extra characters such as -XX:+BoolFlag=123
954 return false;
955 }
956 return set_bool_flag(flag, bool_val, origin);
957 }
958
959 if (arg[0] == '=') {
960 const char* value = arg + 1;
961 if (flag->is_ccstr()) {
962 if (flag->ccstr_accumulates()) {
963 return append_to_string_flag(flag, value, origin);
964 } else {
965 return set_string_flag(flag, value, origin);
966 }
967 } else if (flag->is_double()) {
968 return set_fp_numeric_flag(flag, value, origin);
969 } else {
970 return set_numeric_flag(flag, value, origin);
971 }
972 }
973
974 if (arg[0] == ':' && arg[1] == '=') {
975 // -XX:Foo:=xxx will reset the string flag to the given value.
976 const char* value = arg + 2;
977 return set_string_flag(flag, value, origin);
978 }
979
980 return false;
981 }
982
983 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
984 assert(bldarray != nullptr, "illegal argument");
985
986 if (arg == nullptr) {
987 return;
988 }
989
990 int new_count = *count + 1;
991
992 // expand the array and add arg to the last element
993 if (*bldarray == nullptr) {
994 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
995 } else {
996 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
997 }
998 (*bldarray)[*count] = os::strdup_check_oom(arg);
999 *count = new_count;
1000 }
1001
1002 void Arguments::build_jvm_args(const char* arg) {
1003 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1004 }
1005
1006 void Arguments::build_jvm_flags(const char* arg) {
1007 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1008 }
1009
1010 // utility function to return a string that concatenates all
1011 // strings in a given char** array
1012 const char* Arguments::build_resource_string(char** args, int count) {
1013 if (args == nullptr || count == 0) {
1014 return nullptr;
1015 }
1016 size_t length = 0;
1017 for (int i = 0; i < count; i++) {
1018 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1019 }
1020 char* s = NEW_RESOURCE_ARRAY(char, length);
1021 char* dst = s;
1022 for (int j = 0; j < count; j++) {
1023 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1024 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1025 dst += offset;
1026 length -= offset;
1027 }
1028 return (const char*) s;
1029 }
1030
1031 void Arguments::print_on(outputStream* st) {
1032 st->print_cr("VM Arguments:");
1033 if (num_jvm_flags() > 0) {
1034 st->print("jvm_flags: "); print_jvm_flags_on(st);
1035 st->cr();
1036 }
1037 if (num_jvm_args() > 0) {
1038 st->print("jvm_args: "); print_jvm_args_on(st);
1039 st->cr();
1040 }
1041 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1042 if (_java_class_path != nullptr) {
1043 char* path = _java_class_path->value();
1044 size_t len = strlen(path);
1045 st->print("java_class_path (initial): ");
1046 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1047 if (len == 0) {
1048 st->print_raw_cr("<not set>");
1049 } else {
1050 st->print_raw_cr(path, len);
1051 }
1052 }
1053 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1054 }
1055
1056 void Arguments::print_summary_on(outputStream* st) {
1057 // Print the command line. Environment variables that are helpful for
1058 // reproducing the problem are written later in the hs_err file.
1059 // flags are from setting file
1060 if (num_jvm_flags() > 0) {
1061 st->print_raw("Settings File: ");
1062 print_jvm_flags_on(st);
1063 st->cr();
1064 }
1065 // args are the command line and environment variable arguments.
1066 st->print_raw("Command Line: ");
1067 if (num_jvm_args() > 0) {
1068 print_jvm_args_on(st);
1069 }
1070 // this is the classfile and any arguments to the java program
1071 if (java_command() != nullptr) {
1072 st->print("%s", java_command());
1073 }
1074 st->cr();
1075 }
1076
1077 void Arguments::print_jvm_flags_on(outputStream* st) {
1078 if (_num_jvm_flags > 0) {
1079 for (int i=0; i < _num_jvm_flags; i++) {
1080 st->print("%s ", _jvm_flags_array[i]);
1081 }
1082 }
1083 }
1084
1085 void Arguments::print_jvm_args_on(outputStream* st) {
1086 if (_num_jvm_args > 0) {
1087 for (int i=0; i < _num_jvm_args; i++) {
1088 st->print("%s ", _jvm_args_array[i]);
1089 }
1090 }
1091 }
1092
1093 bool Arguments::process_argument(const char* arg,
1094 jboolean ignore_unrecognized,
1095 JVMFlagOrigin origin) {
1096 JDK_Version since = JDK_Version();
1097
1098 if (parse_argument(arg, origin)) {
1099 return true;
1100 }
1101
1102 // Determine if the flag has '+', '-', or '=' characters.
1103 bool has_plus_minus = (*arg == '+' || *arg == '-');
1104 const char* const argname = has_plus_minus ? arg + 1 : arg;
1105
1106 size_t arg_len;
1107 const char* equal_sign = strchr(argname, '=');
1108 if (equal_sign == nullptr) {
1109 arg_len = strlen(argname);
1110 } else {
1111 arg_len = equal_sign - argname;
1112 }
1113
1114 // Only make the obsolete check for valid arguments.
1115 if (arg_len <= BUFLEN) {
1116 // Construct a string which consists only of the argument name without '+', '-', or '='.
1117 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1118 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1119 if (is_obsolete_flag(stripped_argname, &since)) {
1120 char version[256];
1121 since.to_string(version, sizeof(version));
1122 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1123 return true;
1124 }
1125 }
1126
1127 // For locked flags, report a custom error message if available.
1128 // Otherwise, report the standard unrecognized VM option.
1129 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1130 if (found_flag != nullptr) {
1131 char locked_message_buf[BUFLEN];
1132 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1133 if (strlen(locked_message_buf) == 0) {
1134 if (found_flag->is_bool() && !has_plus_minus) {
1135 jio_fprintf(defaultStream::error_stream(),
1136 "Missing +/- setting for VM option '%s'\n", argname);
1137 } else if (!found_flag->is_bool() && has_plus_minus) {
1138 jio_fprintf(defaultStream::error_stream(),
1139 "Unexpected +/- setting in VM option '%s'\n", argname);
1140 } else {
1141 jio_fprintf(defaultStream::error_stream(),
1142 "Improperly specified VM option '%s'\n", argname);
1143 }
1144 } else {
1145 #ifdef PRODUCT
1146 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1147 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1148 if (ignore_unrecognized && mismatched) {
1149 return true;
1150 }
1151 #endif
1152 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1153 }
1154 } else {
1155 if (ignore_unrecognized) {
1156 return true;
1157 }
1158 jio_fprintf(defaultStream::error_stream(),
1159 "Unrecognized VM option '%s'\n", argname);
1160 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1161 if (fuzzy_matched != nullptr) {
1162 jio_fprintf(defaultStream::error_stream(),
1163 "Did you mean '%s%s%s'?\n",
1164 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1165 fuzzy_matched->name(),
1166 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1167 }
1168 }
1169
1170 // allow for commandline "commenting out" options like -XX:#+Verbose
1171 return arg[0] == '#';
1172 }
1173
1174 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1175 FILE* stream = os::fopen(file_name, "rb");
1176 if (stream == nullptr) {
1177 if (should_exist) {
1178 jio_fprintf(defaultStream::error_stream(),
1179 "Could not open settings file %s\n", file_name);
1180 return false;
1181 } else {
1182 return true;
1183 }
1184 }
1185
1186 char token[1024];
1187 int pos = 0;
1188
1189 bool in_white_space = true;
1190 bool in_comment = false;
1191 bool in_quote = false;
1192 int quote_c = 0;
1193 bool result = true;
1194
1195 int c = getc(stream);
1196 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1197 if (in_white_space) {
1198 if (in_comment) {
1199 if (c == '\n') in_comment = false;
1200 } else {
1201 if (c == '#') in_comment = true;
1202 else if (!isspace(c)) {
1203 in_white_space = false;
1204 token[pos++] = checked_cast<char>(c);
1205 }
1206 }
1207 } else {
1208 if (c == '\n' || (!in_quote && isspace(c))) {
1209 // token ends at newline, or at unquoted whitespace
1210 // this allows a way to include spaces in string-valued options
1211 token[pos] = '\0';
1212 logOption(token);
1213 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1214 build_jvm_flags(token);
1215 pos = 0;
1216 in_white_space = true;
1217 in_quote = false;
1218 } else if (!in_quote && (c == '\'' || c == '"')) {
1219 in_quote = true;
1220 quote_c = c;
1221 } else if (in_quote && (c == quote_c)) {
1222 in_quote = false;
1223 } else {
1224 token[pos++] = checked_cast<char>(c);
1225 }
1226 }
1227 c = getc(stream);
1228 }
1229 if (pos > 0) {
1230 token[pos] = '\0';
1231 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1232 build_jvm_flags(token);
1233 }
1234 fclose(stream);
1235 return result;
1236 }
1237
1238 //=============================================================================================================
1239 // Parsing of properties (-D)
1240
1241 const char* Arguments::get_property(const char* key) {
1242 return PropertyList_get_value(system_properties(), key);
1243 }
1244
1245 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1246 const char* eq = strchr(prop, '=');
1247 const char* key;
1248 const char* value = "";
1249
1250 if (eq == nullptr) {
1251 // property doesn't have a value, thus use passed string
1252 key = prop;
1253 } else {
1254 // property have a value, thus extract it and save to the
1255 // allocated string
1256 size_t key_len = eq - prop;
1257 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1258
1259 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1260 key = tmp_key;
1261
1262 value = &prop[key_len + 1];
1263 }
1264
1265 #if INCLUDE_CDS
1266 if (is_internal_module_property(key)) {
1267 MetaspaceShared::disable_optimized_module_handling();
1268 log_info(cds)("optimized module handling: disabled due to incompatible property: %s=%s", key, value);
1269 }
1270 if (strcmp(key, "jdk.module.showModuleResolution") == 0 ||
1271 strcmp(key, "jdk.module.validation") == 0 ||
1272 strcmp(key, "java.system.class.loader") == 0) {
1273 CDSConfig::disable_loading_full_module_graph();
1274 CDSConfig::disable_dumping_full_module_graph();
1275 log_info(cds)("full module graph: disabled due to incompatible property: %s=%s", key, value);
1276 }
1277 #endif
1278
1279 if (strcmp(key, "java.compiler") == 0) {
1280 // we no longer support java.compiler system property, log a warning and let it get
1281 // passed to Java, like any other system property
1282 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1283 // for applications using NONE or empty value, log a more informative message
1284 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1285 } else {
1286 warning("The java.compiler system property is obsolete and no longer supported.");
1287 }
1288 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1289 // sun.java.launcher.is_altjvm property is
1290 // private and is processed in process_sun_java_launcher_properties();
1291 // the sun.java.launcher property is passed on to the java application
1292 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1293 // append is true, writable is true, internal is false
1294 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1295 WriteableProperty, ExternalProperty);
1296 } else {
1297 if (strcmp(key, "sun.java.command") == 0) {
1298 char *old_java_command = _java_command;
1299 _java_command = os::strdup_check_oom(value, mtArguments);
1300 if (old_java_command != nullptr) {
1301 os::free(old_java_command);
1302 }
1303 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1304 // If this property is set on the command line then its value will be
1305 // displayed in VM error logs as the URL at which to submit such logs.
1306 // Normally the URL displayed in error logs is different from the value
1307 // of this system property, so a different property should have been
1308 // used here, but we leave this as-is in case someone depends upon it.
1309 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1310 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1311 // its value without going through the property list or making a Java call.
1312 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1313 if (old_java_vendor_url_bug != nullptr) {
1314 os::free((void *)old_java_vendor_url_bug);
1315 }
1316 }
1317
1318 // Create new property and add at the end of the list
1319 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1320 }
1321
1322 if (key != prop) {
1323 // SystemProperty copy passed value, thus free previously allocated
1324 // memory
1325 FreeHeap((void *)key);
1326 }
1327
1328 return true;
1329 }
1330
1331 #if INCLUDE_CDS
1332 const char* unsupported_properties[] = { "jdk.module.limitmods",
1333 "jdk.module.upgrade.path",
1334 "jdk.module.patch.0" };
1335 const char* unsupported_options[] = { "--limit-modules",
1336 "--upgrade-module-path",
1337 "--patch-module"
1338 };
1339 void Arguments::check_unsupported_dumping_properties() {
1340 assert(CDSConfig::is_dumping_archive(),
1341 "this function is only used with CDS dump time");
1342 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1343 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1344 SystemProperty* sp = system_properties();
1345 while (sp != nullptr) {
1346 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1347 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1348 vm_exit_during_initialization(
1349 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1350 }
1351 }
1352 sp = sp->next();
1353 }
1354
1355 // Check for an exploded module build in use with -Xshare:dump.
1356 if (!has_jimage()) {
1357 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1358 }
1359 }
1360
1361 bool Arguments::check_unsupported_cds_runtime_properties() {
1362 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1363 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1364 if (ArchiveClassesAtExit != nullptr) {
1365 // dynamic dumping, just return false for now.
1366 // check_unsupported_dumping_properties() will be called later to check the same set of
1367 // properties, and will exit the VM with the correct error message if the unsupported properties
1368 // are used.
1369 return false;
1370 }
1371 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1372 if (get_property(unsupported_properties[i]) != nullptr) {
1373 if (RequireSharedSpaces) {
1374 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1375 } else {
1376 log_info(cds)("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1377 }
1378 return true;
1379 }
1380 }
1381 return false;
1382 }
1383 #endif
1384
1385 //===========================================================================================================
1386 // Setting int/mixed/comp mode flags
1387
1388 void Arguments::set_mode_flags(Mode mode) {
1389 // Set up default values for all flags.
1390 // If you add a flag to any of the branches below,
1391 // add a default value for it here.
1392 _mode = mode;
1393
1394 // Ensure Agent_OnLoad has the correct initial values.
1395 // This may not be the final mode; mode may change later in onload phase.
1396 PropertyList_unique_add(&_system_properties, "java.vm.info",
1397 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1398
1399 UseInterpreter = true;
1400 UseCompiler = true;
1401 UseLoopCounter = true;
1402
1403 // Default values may be platform/compiler dependent -
1404 // use the saved values
1405 ClipInlining = Arguments::_ClipInlining;
1406 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1407 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1408 BackgroundCompilation = Arguments::_BackgroundCompilation;
1409
1410 // Change from defaults based on mode
1411 switch (mode) {
1412 default:
1413 ShouldNotReachHere();
1414 break;
1415 case _int:
1416 UseCompiler = false;
1417 UseLoopCounter = false;
1418 AlwaysCompileLoopMethods = false;
1419 UseOnStackReplacement = false;
1420 break;
1421 case _mixed:
1422 // same as default
1423 break;
1424 case _comp:
1425 UseInterpreter = false;
1426 BackgroundCompilation = false;
1427 ClipInlining = false;
1428 break;
1429 }
1430 }
1431
1432 // Conflict: required to use shared spaces (-Xshare:on), but
1433 // incompatible command line options were chosen.
1434 static void no_shared_spaces(const char* message) {
1435 if (RequireSharedSpaces) {
1436 jio_fprintf(defaultStream::error_stream(),
1437 "Class data sharing is inconsistent with other specified options.\n");
1438 vm_exit_during_initialization("Unable to use shared archive", message);
1439 } else {
1440 log_info(cds)("Unable to use shared archive: %s", message);
1441 UseSharedSpaces = false;
1442 }
1443 }
1444
1445 void set_object_alignment() {
1446 // Object alignment.
1447 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1448 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1449 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1450 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1451 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1452 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1453
1454 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1455 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1456
1457 // Oop encoding heap max
1458 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1459 }
1460
1461 size_t Arguments::max_heap_for_compressed_oops() {
1462 // Avoid sign flip.
1463 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1464 // We need to fit both the null page and the heap into the memory budget, while
1465 // keeping alignment constraints of the heap. To guarantee the latter, as the
1466 // null page is located before the heap, we pad the null page to the conservative
1467 // maximum alignment that the GC may ever impose upon the heap.
1468 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1469 _conservative_max_heap_alignment);
1470
1471 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1472 NOT_LP64(ShouldNotReachHere(); return 0);
1473 }
1474
1475 void Arguments::set_use_compressed_oops() {
1476 #ifdef _LP64
1477 // MaxHeapSize is not set up properly at this point, but
1478 // the only value that can override MaxHeapSize if we are
1479 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1480 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1481
1482 if (max_heap_size <= max_heap_for_compressed_oops()) {
1483 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1484 FLAG_SET_ERGO(UseCompressedOops, true);
1485 }
1486 } else {
1487 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1488 warning("Max heap size too large for Compressed Oops");
1489 FLAG_SET_DEFAULT(UseCompressedOops, false);
1490 }
1491 }
1492 #endif // _LP64
1493 }
1494
1495 void Arguments::set_use_compressed_klass_ptrs() {
1496 #ifdef _LP64
1497 assert(!UseCompressedClassPointers || CompressedClassSpaceSize <= KlassEncodingMetaspaceMax,
1498 "CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1499 #endif // _LP64
1500 }
1501
1502 void Arguments::set_conservative_max_heap_alignment() {
1503 // The conservative maximum required alignment for the heap is the maximum of
1504 // the alignments imposed by several sources: any requirements from the heap
1505 // itself and the maximum page size we may run the VM with.
1506 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1507 _conservative_max_heap_alignment = MAX4(heap_alignment,
1508 os::vm_allocation_granularity(),
1509 os::max_page_size(),
1510 GCArguments::compute_heap_alignment());
1511 }
1512
1513 jint Arguments::set_ergonomics_flags() {
1514 GCConfig::initialize();
1515
1516 set_conservative_max_heap_alignment();
1517
1518 #ifdef _LP64
1519 set_use_compressed_oops();
1520 set_use_compressed_klass_ptrs();
1521
1522 // Also checks that certain machines are slower with compressed oops
1523 // in vm_version initialization code.
1524 #endif // _LP64
1525
1526 return JNI_OK;
1527 }
1528
1529 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1530 size_t max_allocatable;
1531 size_t result = limit;
1532 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1533 // The AggressiveHeap check is a temporary workaround to avoid calling
1534 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1535 // selected. This works because AggressiveHeap implies UseParallelGC
1536 // where we know the ratio will be 1. Once the AggressiveHeap option is
1537 // removed, this can be cleaned up.
1538 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1539 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1540 result = MIN2(result, max_allocatable / fraction);
1541 }
1542 return result;
1543 }
1544
1545 // Use static initialization to get the default before parsing
1546 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1547
1548 void Arguments::set_heap_size() {
1549 julong phys_mem;
1550
1551 // If the user specified one of these options, they
1552 // want specific memory sizing so do not limit memory
1553 // based on compressed oops addressability.
1554 // Also, memory limits will be calculated based on
1555 // available os physical memory, not our MaxRAM limit,
1556 // unless MaxRAM is also specified.
1557 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1558 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1559 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1560 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1561 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1562 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1563 !FLAG_IS_DEFAULT(MaxRAM));
1564 if (override_coop_limit) {
1565 if (FLAG_IS_DEFAULT(MaxRAM)) {
1566 phys_mem = os::physical_memory();
1567 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1568 } else {
1569 phys_mem = (julong)MaxRAM;
1570 }
1571 } else {
1572 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1573 : (julong)MaxRAM;
1574 }
1575
1576
1577 // Convert deprecated flags
1578 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1579 !FLAG_IS_DEFAULT(MaxRAMFraction))
1580 MaxRAMPercentage = 100.0 / (double)MaxRAMFraction;
1581
1582 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1583 !FLAG_IS_DEFAULT(MinRAMFraction))
1584 MinRAMPercentage = 100.0 / (double)MinRAMFraction;
1585
1586 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1587 !FLAG_IS_DEFAULT(InitialRAMFraction))
1588 InitialRAMPercentage = 100.0 / (double)InitialRAMFraction;
1589
1590 // If the maximum heap size has not been set with -Xmx,
1591 // then set it as fraction of the size of physical memory,
1592 // respecting the maximum and minimum sizes of the heap.
1593 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1594 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1595 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1596 if (reasonable_min < MaxHeapSize) {
1597 // Small physical memory, so use a minimum fraction of it for the heap
1598 reasonable_max = reasonable_min;
1599 } else {
1600 // Not-small physical memory, so require a heap at least
1601 // as large as MaxHeapSize
1602 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1603 }
1604
1605 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1606 // Limit the heap size to ErgoHeapSizeLimit
1607 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1608 }
1609
1610 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1611
1612 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1613 // An initial heap size was specified on the command line,
1614 // so be sure that the maximum size is consistent. Done
1615 // after call to limit_heap_by_allocatable_memory because that
1616 // method might reduce the allocation size.
1617 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1618 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1619 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1620 }
1621
1622 #ifdef _LP64
1623 if (UseCompressedOops || UseCompressedClassPointers) {
1624 // HeapBaseMinAddress can be greater than default but not less than.
1625 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1626 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1627 // matches compressed oops printing flags
1628 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1629 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1630 DefaultHeapBaseMinAddress,
1631 DefaultHeapBaseMinAddress/G,
1632 HeapBaseMinAddress);
1633 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1634 }
1635 }
1636 }
1637 if (UseCompressedOops) {
1638 // Limit the heap size to the maximum possible when using compressed oops
1639 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1640
1641 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1642 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1643 // but it should be not less than default MaxHeapSize.
1644 max_coop_heap -= HeapBaseMinAddress;
1645 }
1646
1647 // If user specified flags prioritizing os physical
1648 // memory limits, then disable compressed oops if
1649 // limits exceed max_coop_heap and UseCompressedOops
1650 // was not specified.
1651 if (reasonable_max > max_coop_heap) {
1652 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1653 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1654 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1655 "Please check the setting of MaxRAMPercentage %5.2f."
1656 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1657 FLAG_SET_ERGO(UseCompressedOops, false);
1658 } else {
1659 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1660 }
1661 }
1662 }
1663 #endif // _LP64
1664
1665 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1666 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1667 }
1668
1669 // If the minimum or initial heap_size have not been set or requested to be set
1670 // ergonomically, set them accordingly.
1671 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1672 julong reasonable_minimum = (julong)(OldSize + NewSize);
1673
1674 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1675
1676 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1677
1678 if (InitialHeapSize == 0) {
1679 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1680 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1681
1682 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1683 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1684
1685 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1686 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1687 }
1688 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1689 // synchronize with InitialHeapSize to avoid errors with the default value.
1690 if (MinHeapSize == 0) {
1691 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1692 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1693 }
1694 }
1695 }
1696
1697 // This option inspects the machine and attempts to set various
1698 // parameters to be optimal for long-running, memory allocation
1699 // intensive jobs. It is intended for machines with large
1700 // amounts of cpu and memory.
1701 jint Arguments::set_aggressive_heap_flags() {
1702 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1703 // VM, but we may not be able to represent the total physical memory
1704 // available (like having 8gb of memory on a box but using a 32bit VM).
1705 // Thus, we need to make sure we're using a julong for intermediate
1706 // calculations.
1707 julong initHeapSize;
1708 julong total_memory = os::physical_memory();
1709
1710 if (total_memory < (julong) 256 * M) {
1711 jio_fprintf(defaultStream::error_stream(),
1712 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1713 vm_exit(1);
1714 }
1715
1716 // The heap size is half of available memory, or (at most)
1717 // all of possible memory less 160mb (leaving room for the OS
1718 // when using ISM). This is the maximum; because adaptive sizing
1719 // is turned on below, the actual space used may be smaller.
1720
1721 initHeapSize = MIN2(total_memory / (julong) 2,
1722 total_memory - (julong) 160 * M);
1723
1724 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1725
1726 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1727 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1728 return JNI_EINVAL;
1729 }
1730 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1731 return JNI_EINVAL;
1732 }
1733 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1734 return JNI_EINVAL;
1735 }
1736 }
1737 if (FLAG_IS_DEFAULT(NewSize)) {
1738 // Make the young generation 3/8ths of the total heap.
1739 if (FLAG_SET_CMDLINE(NewSize,
1740 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1741 return JNI_EINVAL;
1742 }
1743 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1744 return JNI_EINVAL;
1745 }
1746 }
1747
1748 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1749 FLAG_SET_DEFAULT(UseLargePages, true);
1750 #endif
1751
1752 // Increase some data structure sizes for efficiency
1753 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1754 return JNI_EINVAL;
1755 }
1756 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1757 return JNI_EINVAL;
1758 }
1759 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1760 return JNI_EINVAL;
1761 }
1762
1763 // See the OldPLABSize comment below, but replace 'after promotion'
1764 // with 'after copying'. YoungPLABSize is the size of the survivor
1765 // space per-gc-thread buffers. The default is 4kw.
1766 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1767 return JNI_EINVAL;
1768 }
1769
1770 // OldPLABSize is the size of the buffers in the old gen that
1771 // UseParallelGC uses to promote live data that doesn't fit in the
1772 // survivor spaces. At any given time, there's one for each gc thread.
1773 // The default size is 1kw. These buffers are rarely used, since the
1774 // survivor spaces are usually big enough. For specjbb, however, there
1775 // are occasions when there's lots of live data in the young gen
1776 // and we end up promoting some of it. We don't have a definite
1777 // explanation for why bumping OldPLABSize helps, but the theory
1778 // is that a bigger PLAB results in retaining something like the
1779 // original allocation order after promotion, which improves mutator
1780 // locality. A minor effect may be that larger PLABs reduce the
1781 // number of PLAB allocation events during gc. The value of 8kw
1782 // was arrived at by experimenting with specjbb.
1783 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1784 return JNI_EINVAL;
1785 }
1786
1787 // Enable parallel GC and adaptive generation sizing
1788 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1789 return JNI_EINVAL;
1790 }
1791
1792 // Encourage steady state memory management
1793 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1794 return JNI_EINVAL;
1795 }
1796
1797 // This appears to improve mutator locality
1798 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1799 return JNI_EINVAL;
1800 }
1801
1802 return JNI_OK;
1803 }
1804
1805 // This must be called after ergonomics.
1806 void Arguments::set_bytecode_flags() {
1807 if (!RewriteBytecodes) {
1808 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1809 }
1810 }
1811
1812 // Aggressive optimization flags
1813 jint Arguments::set_aggressive_opts_flags() {
1814 #ifdef COMPILER2
1815 if (AggressiveUnboxing) {
1816 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1817 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1818 } else if (!EliminateAutoBox) {
1819 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1820 AggressiveUnboxing = false;
1821 }
1822 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1823 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1824 } else if (!DoEscapeAnalysis) {
1825 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1826 AggressiveUnboxing = false;
1827 }
1828 }
1829 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1830 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1831 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1832 }
1833 // Feed the cache size setting into the JDK
1834 char buffer[1024];
1835 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1836 if (!add_property(buffer)) {
1837 return JNI_ENOMEM;
1838 }
1839 }
1840 #endif
1841
1842 return JNI_OK;
1843 }
1844
1845 //===========================================================================================================
1846
1847 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1848 if (_sun_java_launcher != _default_java_launcher) {
1849 os::free(const_cast<char*>(_sun_java_launcher));
1850 }
1851 _sun_java_launcher = os::strdup_check_oom(launcher);
1852 }
1853
1854 bool Arguments::created_by_java_launcher() {
1855 assert(_sun_java_launcher != nullptr, "property must have value");
1856 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1857 }
1858
1859 bool Arguments::sun_java_launcher_is_altjvm() {
1860 return _sun_java_launcher_is_altjvm;
1861 }
1862
1863 //===========================================================================================================
1864 // Parsing of main arguments
1865
1866 unsigned int addreads_count = 0;
1867 unsigned int addexports_count = 0;
1868 unsigned int addopens_count = 0;
1869 unsigned int addmods_count = 0;
1870 unsigned int patch_mod_count = 0;
1871 unsigned int enable_native_access_count = 0;
1872
1873 // Check the consistency of vm_init_args
1874 bool Arguments::check_vm_args_consistency() {
1875 // Method for adding checks for flag consistency.
1876 // The intent is to warn the user of all possible conflicts,
1877 // before returning an error.
1878 // Note: Needs platform-dependent factoring.
1879 bool status = true;
1880
1881 if (TLABRefillWasteFraction == 0) {
1882 jio_fprintf(defaultStream::error_stream(),
1883 "TLABRefillWasteFraction should be a denominator, "
1884 "not " SIZE_FORMAT "\n",
1885 TLABRefillWasteFraction);
1886 status = false;
1887 }
1888
1889 status = CompilerConfig::check_args_consistency(status);
1890 #if INCLUDE_JVMCI
1891 if (status && EnableJVMCI) {
1892 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1893 AddProperty, UnwriteableProperty, InternalProperty);
1894 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1895 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
1896 return false;
1897 }
1898 }
1899 }
1900 #endif
1901
1902 #if INCLUDE_JFR
1903 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1904 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) {
1905 return false;
1906 }
1907 }
1908 #endif
1909
1910 #ifndef SUPPORT_RESERVED_STACK_AREA
1911 if (StackReservedPages != 0) {
1912 FLAG_SET_CMDLINE(StackReservedPages, 0);
1913 warning("Reserved Stack Area not supported on this platform");
1914 }
1915 #endif
1916
1917 #if !defined(X86) && !defined(AARCH64) && !defined(RISCV64) && !defined(ARM) && !defined(PPC64) && !defined(S390)
1918 if (LockingMode == LM_LIGHTWEIGHT) {
1919 FLAG_SET_CMDLINE(LockingMode, LM_LEGACY);
1920 warning("New lightweight locking not supported on this platform");
1921 }
1922 #endif
1923
1924 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1925 if (LockingMode == LM_MONITOR) {
1926 jio_fprintf(defaultStream::error_stream(),
1927 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1928 return false;
1929 }
1930 #endif
1931 #if defined(X86) && !defined(ZERO)
1932 if (LockingMode == LM_MONITOR && UseRTMForStackLocks) {
1933 jio_fprintf(defaultStream::error_stream(),
1934 "LockingMode == 0 (LM_MONITOR) and -XX:+UseRTMForStackLocks are mutually exclusive\n");
1935
1936 return false;
1937 }
1938 #endif
1939 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1940 jio_fprintf(defaultStream::error_stream(),
1941 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1942 return false;
1943 }
1944 return status;
1945 }
1946
1947 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1948 const char* option_type) {
1949 if (ignore) return false;
1950
1951 const char* spacer = " ";
1952 if (option_type == nullptr) {
1953 option_type = ++spacer; // Set both to the empty string.
1954 }
1955
1956 jio_fprintf(defaultStream::error_stream(),
1957 "Unrecognized %s%soption: %s\n", option_type, spacer,
1958 option->optionString);
1959 return true;
1960 }
1961
1962 static const char* user_assertion_options[] = {
1963 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1964 };
1965
1966 static const char* system_assertion_options[] = {
1967 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1968 };
1969
1970 bool Arguments::parse_uint(const char* value,
1971 uint* uint_arg,
1972 uint min_size) {
1973 uint n;
1974 if (!parse_integer(value, &n)) {
1975 return false;
1976 }
1977 if (n >= min_size) {
1978 *uint_arg = n;
1979 return true;
1980 } else {
1981 return false;
1982 }
1983 }
1984
1985 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1986 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1987 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1988 char* property = AllocateHeap(prop_len, mtArguments);
1989 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1990 if (ret < 0 || ret >= (int)prop_len) {
1991 FreeHeap(property);
1992 return false;
1993 }
1994 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1995 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1996 // that multiple occurrences of the associated flag just causes the existing property value to be
1997 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1998 // to a property after we have finished flag processing.
1999 bool added = add_property(property, WriteableProperty, internal);
2000 FreeHeap(property);
2001 return added;
2002 }
2003
2004 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2005 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
2006 const unsigned int props_count_limit = 1000;
2007 const int max_digits = 3;
2008 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2009
2010 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2011 if (count < props_count_limit) {
2012 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2013 char* property = AllocateHeap(prop_len, mtArguments);
2014 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2015 if (ret < 0 || ret >= (int)prop_len) {
2016 FreeHeap(property);
2017 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2018 return false;
2019 }
2020 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2021 FreeHeap(property);
2022 return added;
2023 }
2024
2025 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2026 return false;
2027 }
2028
2029 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2030 julong* long_arg,
2031 julong min_size,
2032 julong max_size) {
2033 if (!parse_integer(s, long_arg)) return arg_unreadable;
2034 return check_memory_size(*long_arg, min_size, max_size);
2035 }
2036
2037 // Parse JavaVMInitArgs structure
2038
2039 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
2040 const JavaVMInitArgs *java_tool_options_args,
2041 const JavaVMInitArgs *java_options_args,
2042 const JavaVMInitArgs *cmd_line_args) {
2043 bool patch_mod_javabase = false;
2044
2045 // Save default settings for some mode flags
2046 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2047 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2048 Arguments::_ClipInlining = ClipInlining;
2049 Arguments::_BackgroundCompilation = BackgroundCompilation;
2050
2051 // Remember the default value of SharedBaseAddress.
2052 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
2053
2054 // Setup flags for mixed which is the default
2055 set_mode_flags(_mixed);
2056
2057 // Parse args structure generated from java.base vm options resource
2058 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE);
2059 if (result != JNI_OK) {
2060 return result;
2061 }
2062
2063 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2064 // variable (if present).
2065 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
2066 if (result != JNI_OK) {
2067 return result;
2068 }
2069
2070 // Parse args structure generated from the command line flags.
2071 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE);
2072 if (result != JNI_OK) {
2073 return result;
2074 }
2075
2076 // Parse args structure generated from the _JAVA_OPTIONS environment
2077 // variable (if present) (mimics classic VM)
2078 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
2079 if (result != JNI_OK) {
2080 return result;
2081 }
2082
2083 // Disable CDS for exploded image
2084 if (!has_jimage()) {
2085 no_shared_spaces("CDS disabled on exploded JDK");
2086 }
2087
2088 // We need to ensure processor and memory resources have been properly
2089 // configured - which may rely on arguments we just processed - before
2090 // doing the final argument processing. Any argument processing that
2091 // needs to know about processor and memory resources must occur after
2092 // this point.
2093
2094 os::init_container_support();
2095
2096 SystemMemoryBarrier::initialize();
2097
2098 // Do final processing now that all arguments have been parsed
2099 result = finalize_vm_init_args(patch_mod_javabase);
2100 if (result != JNI_OK) {
2101 return result;
2102 }
2103
2104 return JNI_OK;
2105 }
2106
2107 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2108 // represents a valid JDWP agent. is_path==true denotes that we
2109 // are dealing with -agentpath (case where name is a path), otherwise with
2110 // -agentlib
2111 bool valid_jdwp_agent(char *name, bool is_path) {
2112 char *_name;
2113 const char *_jdwp = "jdwp";
2114 size_t _len_jdwp, _len_prefix;
2115
2116 if (is_path) {
2117 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2118 return false;
2119 }
2120
2121 _name++; // skip past last path separator
2122 _len_prefix = strlen(JNI_LIB_PREFIX);
2123
2124 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2125 return false;
2126 }
2127
2128 _name += _len_prefix;
2129 _len_jdwp = strlen(_jdwp);
2130
2131 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2132 _name += _len_jdwp;
2133 }
2134 else {
2135 return false;
2136 }
2137
2138 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2139 return false;
2140 }
2141
2142 return true;
2143 }
2144
2145 if (strcmp(name, _jdwp) == 0) {
2146 return true;
2147 }
2148
2149 return false;
2150 }
2151
2152 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2153 // --patch-module=<module>=<file>(<pathsep><file>)*
2154 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2155 // Find the equal sign between the module name and the path specification
2156 const char* module_equal = strchr(patch_mod_tail, '=');
2157 if (module_equal == nullptr) {
2158 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2159 return JNI_ERR;
2160 } else {
2161 // Pick out the module name
2162 size_t module_len = module_equal - patch_mod_tail;
2163 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2164 if (module_name != nullptr) {
2165 memcpy(module_name, patch_mod_tail, module_len);
2166 *(module_name + module_len) = '\0';
2167 // The path piece begins one past the module_equal sign
2168 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2169 FREE_C_HEAP_ARRAY(char, module_name);
2170 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2171 return JNI_ENOMEM;
2172 }
2173 } else {
2174 return JNI_ENOMEM;
2175 }
2176 }
2177 return JNI_OK;
2178 }
2179
2180 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2181 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2182 // The min and max sizes match the values in globals.hpp, but scaled
2183 // with K. The values have been chosen so that alignment with page
2184 // size doesn't change the max value, which makes the conversions
2185 // back and forth between Xss value and ThreadStackSize value easier.
2186 // The values have also been chosen to fit inside a 32-bit signed type.
2187 const julong min_ThreadStackSize = 0;
2188 const julong max_ThreadStackSize = 1 * M;
2189
2190 // Make sure the above values match the range set in globals.hpp
2191 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2192 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2193 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2194
2195 const julong min_size = min_ThreadStackSize * K;
2196 const julong max_size = max_ThreadStackSize * K;
2197
2198 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2199
2200 julong size = 0;
2201 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2202 if (errcode != arg_in_range) {
2203 bool silent = (option == nullptr); // Allow testing to silence error messages
2204 if (!silent) {
2205 jio_fprintf(defaultStream::error_stream(),
2206 "Invalid thread stack size: %s\n", option->optionString);
2207 describe_range_error(errcode);
2208 }
2209 return JNI_EINVAL;
2210 }
2211
2212 // Internally track ThreadStackSize in units of 1024 bytes.
2213 const julong size_aligned = align_up(size, K);
2214 assert(size <= size_aligned,
2215 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2216 size, size_aligned);
2217
2218 const julong size_in_K = size_aligned / K;
2219 assert(size_in_K < (julong)max_intx,
2220 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2221 size_in_K);
2222
2223 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2224 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2225 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2226 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2227 max_expanded, size_in_K);
2228
2229 *out_ThreadStackSize = (intx)size_in_K;
2230
2231 return JNI_OK;
2232 }
2233
2234 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) {
2235 // For match_option to return remaining or value part of option string
2236 const char* tail;
2237
2238 // iterate over arguments
2239 for (int index = 0; index < args->nOptions; index++) {
2240 bool is_absolute_path = false; // for -agentpath vs -agentlib
2241
2242 const JavaVMOption* option = args->options + index;
2243
2244 if (!match_option(option, "-Djava.class.path", &tail) &&
2245 !match_option(option, "-Dsun.java.command", &tail) &&
2246 !match_option(option, "-Dsun.java.launcher", &tail)) {
2247
2248 // add all jvm options to the jvm_args string. This string
2249 // is used later to set the java.vm.args PerfData string constant.
2250 // the -Djava.class.path and the -Dsun.java.command options are
2251 // omitted from jvm_args string as each have their own PerfData
2252 // string constant object.
2253 build_jvm_args(option->optionString);
2254 }
2255
2256 // -verbose:[class/module/gc/jni]
2257 if (match_option(option, "-verbose", &tail)) {
2258 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2259 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2260 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2261 } else if (!strcmp(tail, ":module")) {
2262 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2263 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2264 } else if (!strcmp(tail, ":gc")) {
2265 if (_legacyGCLogging.lastFlag == 0) {
2266 _legacyGCLogging.lastFlag = 1;
2267 }
2268 } else if (!strcmp(tail, ":jni")) {
2269 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2270 }
2271 // -da / -ea / -disableassertions / -enableassertions
2272 // These accept an optional class/package name separated by a colon, e.g.,
2273 // -da:java.lang.Thread.
2274 } else if (match_option(option, user_assertion_options, &tail, true)) {
2275 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2276 if (*tail == '\0') {
2277 JavaAssertions::setUserClassDefault(enable);
2278 } else {
2279 assert(*tail == ':', "bogus match by match_option()");
2280 JavaAssertions::addOption(tail + 1, enable);
2281 }
2282 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2283 } else if (match_option(option, system_assertion_options, &tail, false)) {
2284 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2285 JavaAssertions::setSystemClassDefault(enable);
2286 // -bootclasspath:
2287 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2288 jio_fprintf(defaultStream::output_stream(),
2289 "-Xbootclasspath is no longer a supported option.\n");
2290 return JNI_EINVAL;
2291 // -bootclasspath/a:
2292 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2293 Arguments::append_sysclasspath(tail);
2294 #if INCLUDE_CDS
2295 MetaspaceShared::disable_optimized_module_handling();
2296 log_info(cds)("optimized module handling: disabled because bootclasspath was appended");
2297 #endif
2298 // -bootclasspath/p:
2299 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2300 jio_fprintf(defaultStream::output_stream(),
2301 "-Xbootclasspath/p is no longer a supported option.\n");
2302 return JNI_EINVAL;
2303 // -Xrun
2304 } else if (match_option(option, "-Xrun", &tail)) {
2305 if (tail != nullptr) {
2306 const char* pos = strchr(tail, ':');
2307 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2308 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2309 jio_snprintf(name, len + 1, "%s", tail);
2310
2311 char *options = nullptr;
2312 if(pos != nullptr) {
2313 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2314 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2315 }
2316 #if !INCLUDE_JVMTI
2317 if (strcmp(name, "jdwp") == 0) {
2318 jio_fprintf(defaultStream::error_stream(),
2319 "Debugging agents are not supported in this VM\n");
2320 return JNI_ERR;
2321 }
2322 #endif // !INCLUDE_JVMTI
2323 JvmtiAgentList::add_xrun(name, options, false);
2324 FREE_C_HEAP_ARRAY(char, name);
2325 FREE_C_HEAP_ARRAY(char, options);
2326 }
2327 } else if (match_option(option, "--add-reads=", &tail)) {
2328 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2329 return JNI_ENOMEM;
2330 }
2331 } else if (match_option(option, "--add-exports=", &tail)) {
2332 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2333 return JNI_ENOMEM;
2334 }
2335 } else if (match_option(option, "--add-opens=", &tail)) {
2336 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2337 return JNI_ENOMEM;
2338 }
2339 } else if (match_option(option, "--add-modules=", &tail)) {
2340 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {
2341 return JNI_ENOMEM;
2342 }
2343 } else if (match_option(option, "--enable-native-access=", &tail)) {
2344 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2345 return JNI_ENOMEM;
2346 }
2347 } else if (match_option(option, "--limit-modules=", &tail)) {
2348 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2349 return JNI_ENOMEM;
2350 }
2351 } else if (match_option(option, "--module-path=", &tail)) {
2352 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2353 return JNI_ENOMEM;
2354 }
2355 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2356 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2357 return JNI_ENOMEM;
2358 }
2359 } else if (match_option(option, "--patch-module=", &tail)) {
2360 // --patch-module=<module>=<file>(<pathsep><file>)*
2361 int res = process_patch_mod_option(tail, patch_mod_javabase);
2362 if (res != JNI_OK) {
2363 return res;
2364 }
2365 } else if (match_option(option, "--illegal-access=", &tail)) {
2366 char version[256];
2367 JDK_Version::jdk(17).to_string(version, sizeof(version));
2368 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2369 // -agentlib and -agentpath
2370 } else if (match_option(option, "-agentlib:", &tail) ||
2371 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2372 if(tail != nullptr) {
2373 const char* pos = strchr(tail, '=');
2374 char* name;
2375 if (pos == nullptr) {
2376 name = os::strdup_check_oom(tail, mtArguments);
2377 } else {
2378 size_t len = pos - tail;
2379 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2380 memcpy(name, tail, len);
2381 name[len] = '\0';
2382 }
2383
2384 char *options = nullptr;
2385 if(pos != nullptr) {
2386 options = os::strdup_check_oom(pos + 1, mtArguments);
2387 }
2388 #if !INCLUDE_JVMTI
2389 if (valid_jdwp_agent(name, is_absolute_path)) {
2390 jio_fprintf(defaultStream::error_stream(),
2391 "Debugging agents are not supported in this VM\n");
2392 return JNI_ERR;
2393 }
2394 #endif // !INCLUDE_JVMTI
2395 JvmtiAgentList::add(name, options, is_absolute_path);
2396 os::free(name);
2397 os::free(options);
2398 }
2399 // -javaagent
2400 } else if (match_option(option, "-javaagent:", &tail)) {
2401 #if !INCLUDE_JVMTI
2402 jio_fprintf(defaultStream::error_stream(),
2403 "Instrumentation agents are not supported in this VM\n");
2404 return JNI_ERR;
2405 #else
2406 if (tail != nullptr) {
2407 size_t length = strlen(tail) + 1;
2408 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2409 jio_snprintf(options, length, "%s", tail);
2410 JvmtiAgentList::add("instrument", options, false);
2411 FREE_C_HEAP_ARRAY(char, options);
2412
2413 // java agents need module java.instrument
2414 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2415 return JNI_ENOMEM;
2416 }
2417 }
2418 #endif // !INCLUDE_JVMTI
2419 // --enable_preview
2420 } else if (match_option(option, "--enable-preview")) {
2421 set_enable_preview();
2422 // -Xnoclassgc
2423 } else if (match_option(option, "-Xnoclassgc")) {
2424 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2425 return JNI_EINVAL;
2426 }
2427 // -Xbatch
2428 } else if (match_option(option, "-Xbatch")) {
2429 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2430 return JNI_EINVAL;
2431 }
2432 // -Xmn for compatibility with other JVM vendors
2433 } else if (match_option(option, "-Xmn", &tail)) {
2434 julong long_initial_young_size = 0;
2435 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2436 if (errcode != arg_in_range) {
2437 jio_fprintf(defaultStream::error_stream(),
2438 "Invalid initial young generation size: %s\n", option->optionString);
2439 describe_range_error(errcode);
2440 return JNI_EINVAL;
2441 }
2442 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2443 return JNI_EINVAL;
2444 }
2445 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2446 return JNI_EINVAL;
2447 }
2448 // -Xms
2449 } else if (match_option(option, "-Xms", &tail)) {
2450 julong size = 0;
2451 // an initial heap size of 0 means automatically determine
2452 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2453 if (errcode != arg_in_range) {
2454 jio_fprintf(defaultStream::error_stream(),
2455 "Invalid initial heap size: %s\n", option->optionString);
2456 describe_range_error(errcode);
2457 return JNI_EINVAL;
2458 }
2459 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2460 return JNI_EINVAL;
2461 }
2462 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2463 return JNI_EINVAL;
2464 }
2465 // -Xmx
2466 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2467 julong long_max_heap_size = 0;
2468 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2469 if (errcode != arg_in_range) {
2470 jio_fprintf(defaultStream::error_stream(),
2471 "Invalid maximum heap size: %s\n", option->optionString);
2472 describe_range_error(errcode);
2473 return JNI_EINVAL;
2474 }
2475 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2476 return JNI_EINVAL;
2477 }
2478 // Xmaxf
2479 } else if (match_option(option, "-Xmaxf", &tail)) {
2480 char* err;
2481 int maxf = (int)(strtod(tail, &err) * 100);
2482 if (*err != '\0' || *tail == '\0') {
2483 jio_fprintf(defaultStream::error_stream(),
2484 "Bad max heap free percentage size: %s\n",
2485 option->optionString);
2486 return JNI_EINVAL;
2487 } else {
2488 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2489 return JNI_EINVAL;
2490 }
2491 }
2492 // Xminf
2493 } else if (match_option(option, "-Xminf", &tail)) {
2494 char* err;
2495 int minf = (int)(strtod(tail, &err) * 100);
2496 if (*err != '\0' || *tail == '\0') {
2497 jio_fprintf(defaultStream::error_stream(),
2498 "Bad min heap free percentage size: %s\n",
2499 option->optionString);
2500 return JNI_EINVAL;
2501 } else {
2502 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2503 return JNI_EINVAL;
2504 }
2505 }
2506 // -Xss
2507 } else if (match_option(option, "-Xss", &tail)) {
2508 intx value = 0;
2509 jint err = parse_xss(option, tail, &value);
2510 if (err != JNI_OK) {
2511 return err;
2512 }
2513 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2514 return JNI_EINVAL;
2515 }
2516 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2517 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2518 julong long_ReservedCodeCacheSize = 0;
2519
2520 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2521 if (errcode != arg_in_range) {
2522 jio_fprintf(defaultStream::error_stream(),
2523 "Invalid maximum code cache size: %s.\n", option->optionString);
2524 return JNI_EINVAL;
2525 }
2526 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2527 return JNI_EINVAL;
2528 }
2529 // -green
2530 } else if (match_option(option, "-green")) {
2531 jio_fprintf(defaultStream::error_stream(),
2532 "Green threads support not available\n");
2533 return JNI_EINVAL;
2534 // -native
2535 } else if (match_option(option, "-native")) {
2536 // HotSpot always uses native threads, ignore silently for compatibility
2537 // -Xrs
2538 } else if (match_option(option, "-Xrs")) {
2539 // Classic/EVM option, new functionality
2540 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2541 return JNI_EINVAL;
2542 }
2543 // -Xprof
2544 } else if (match_option(option, "-Xprof")) {
2545 char version[256];
2546 // Obsolete in JDK 10
2547 JDK_Version::jdk(10).to_string(version, sizeof(version));
2548 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2549 // -Xinternalversion
2550 } else if (match_option(option, "-Xinternalversion")) {
2551 jio_fprintf(defaultStream::output_stream(), "%s\n",
2552 VM_Version::internal_vm_info_string());
2553 vm_exit(0);
2554 #ifndef PRODUCT
2555 // -Xprintflags
2556 } else if (match_option(option, "-Xprintflags")) {
2557 JVMFlag::printFlags(tty, false);
2558 vm_exit(0);
2559 #endif
2560 // -D
2561 } else if (match_option(option, "-D", &tail)) {
2562 const char* value;
2563 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2564 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2565 // abort if -Djava.endorsed.dirs is set
2566 jio_fprintf(defaultStream::output_stream(),
2567 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2568 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2569 return JNI_EINVAL;
2570 }
2571 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2572 *value != '\0' && strcmp(value, "\"\"") != 0) {
2573 // abort if -Djava.ext.dirs is set
2574 jio_fprintf(defaultStream::output_stream(),
2575 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2576 return JNI_EINVAL;
2577 }
2578 // Check for module related properties. They must be set using the modules
2579 // options. For example: use "--add-modules=java.sql", not
2580 // "-Djdk.module.addmods=java.sql"
2581 if (is_internal_module_property(option->optionString + 2)) {
2582 needs_module_property_warning = true;
2583 continue;
2584 }
2585 if (!add_property(tail)) {
2586 return JNI_ENOMEM;
2587 }
2588 // Out of the box management support
2589 if (match_option(option, "-Dcom.sun.management", &tail)) {
2590 #if INCLUDE_MANAGEMENT
2591 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2592 return JNI_EINVAL;
2593 }
2594 // management agent in module jdk.management.agent
2595 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2596 return JNI_ENOMEM;
2597 }
2598 #else
2599 jio_fprintf(defaultStream::output_stream(),
2600 "-Dcom.sun.management is not supported in this VM.\n");
2601 return JNI_ERR;
2602 #endif
2603 }
2604 // -Xint
2605 } else if (match_option(option, "-Xint")) {
2606 set_mode_flags(_int);
2607 mode_flag_cmd_line = true;
2608 // -Xmixed
2609 } else if (match_option(option, "-Xmixed")) {
2610 set_mode_flags(_mixed);
2611 mode_flag_cmd_line = true;
2612 // -Xcomp
2613 } else if (match_option(option, "-Xcomp")) {
2614 // for testing the compiler; turn off all flags that inhibit compilation
2615 set_mode_flags(_comp);
2616 mode_flag_cmd_line = true;
2617 // -Xshare:dump
2618 } else if (match_option(option, "-Xshare:dump")) {
2619 CDSConfig::enable_dumping_static_archive();
2620 // -Xshare:on
2621 } else if (match_option(option, "-Xshare:on")) {
2622 UseSharedSpaces = true;
2623 RequireSharedSpaces = true;
2624 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2625 } else if (match_option(option, "-Xshare:auto")) {
2626 UseSharedSpaces = true;
2627 RequireSharedSpaces = false;
2628 xshare_auto_cmd_line = true;
2629 // -Xshare:off
2630 } else if (match_option(option, "-Xshare:off")) {
2631 UseSharedSpaces = false;
2632 RequireSharedSpaces = false;
2633 // -Xverify
2634 } else if (match_option(option, "-Xverify", &tail)) {
2635 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2636 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2637 return JNI_EINVAL;
2638 }
2639 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2640 return JNI_EINVAL;
2641 }
2642 } else if (strcmp(tail, ":remote") == 0) {
2643 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2644 return JNI_EINVAL;
2645 }
2646 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2647 return JNI_EINVAL;
2648 }
2649 } else if (strcmp(tail, ":none") == 0) {
2650 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2651 return JNI_EINVAL;
2652 }
2653 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2654 return JNI_EINVAL;
2655 }
2656 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2657 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2658 return JNI_EINVAL;
2659 }
2660 // -Xdebug
2661 } else if (match_option(option, "-Xdebug")) {
2662 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2663 // -Xnoagent
2664 } else if (match_option(option, "-Xnoagent")) {
2665 warning("Option -Xnoagent was deprecated in JDK 22 and will likely be removed in a future release.");
2666 } else if (match_option(option, "-Xloggc:", &tail)) {
2667 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2668 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2669 _legacyGCLogging.lastFlag = 2;
2670 _legacyGCLogging.file = os::strdup_check_oom(tail);
2671 } else if (match_option(option, "-Xlog", &tail)) {
2672 bool ret = false;
2673 if (strcmp(tail, ":help") == 0) {
2674 fileStream stream(defaultStream::output_stream());
2675 LogConfiguration::print_command_line_help(&stream);
2676 vm_exit(0);
2677 } else if (strcmp(tail, ":disable") == 0) {
2678 LogConfiguration::disable_logging();
2679 ret = true;
2680 } else if (strcmp(tail, ":async") == 0) {
2681 LogConfiguration::set_async_mode(true);
2682 ret = true;
2683 } else if (*tail == '\0') {
2684 ret = LogConfiguration::parse_command_line_arguments();
2685 assert(ret, "-Xlog without arguments should never fail to parse");
2686 } else if (*tail == ':') {
2687 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2688 }
2689 if (ret == false) {
2690 jio_fprintf(defaultStream::error_stream(),
2691 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2692 tail);
2693 return JNI_EINVAL;
2694 }
2695 // JNI hooks
2696 } else if (match_option(option, "-Xcheck", &tail)) {
2697 if (!strcmp(tail, ":jni")) {
2698 #if !INCLUDE_JNI_CHECK
2699 warning("JNI CHECKING is not supported in this VM");
2700 #else
2701 CheckJNICalls = true;
2702 #endif // INCLUDE_JNI_CHECK
2703 } else if (is_bad_option(option, args->ignoreUnrecognized,
2704 "check")) {
2705 return JNI_EINVAL;
2706 }
2707 } else if (match_option(option, "vfprintf")) {
2708 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2709 } else if (match_option(option, "exit")) {
2710 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2711 } else if (match_option(option, "abort")) {
2712 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2713 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2714 // and the last option wins.
2715 } else if (match_option(option, "-XX:+NeverTenure")) {
2716 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2717 return JNI_EINVAL;
2718 }
2719 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2720 return JNI_EINVAL;
2721 }
2722 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2723 return JNI_EINVAL;
2724 }
2725 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2726 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2727 return JNI_EINVAL;
2728 }
2729 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2730 return JNI_EINVAL;
2731 }
2732 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2733 return JNI_EINVAL;
2734 }
2735 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2736 uint max_tenuring_thresh = 0;
2737 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2738 jio_fprintf(defaultStream::error_stream(),
2739 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2740 return JNI_EINVAL;
2741 }
2742
2743 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2744 return JNI_EINVAL;
2745 }
2746
2747 if (MaxTenuringThreshold == 0) {
2748 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2749 return JNI_EINVAL;
2750 }
2751 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2752 return JNI_EINVAL;
2753 }
2754 } else {
2755 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2756 return JNI_EINVAL;
2757 }
2758 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2759 return JNI_EINVAL;
2760 }
2761 }
2762 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2763 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2764 return JNI_EINVAL;
2765 }
2766 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2767 return JNI_EINVAL;
2768 }
2769 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2770 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2771 return JNI_EINVAL;
2772 }
2773 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2774 return JNI_EINVAL;
2775 }
2776 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2777 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2778 return JNI_EINVAL;
2779 }
2780 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2781 return JNI_EINVAL;
2782 }
2783 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2784 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2785 return JNI_EINVAL;
2786 }
2787 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2788 return JNI_EINVAL;
2789 }
2790 } else if (match_option(option, "--finalization=", &tail)) {
2791 if (strcmp(tail, "enabled") == 0) {
2792 InstanceKlass::set_finalization_enabled(true);
2793 } else if (strcmp(tail, "disabled") == 0) {
2794 InstanceKlass::set_finalization_enabled(false);
2795 } else {
2796 jio_fprintf(defaultStream::error_stream(),
2797 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2798 tail);
2799 return JNI_EINVAL;
2800 }
2801 #if !defined(DTRACE_ENABLED)
2802 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2803 jio_fprintf(defaultStream::error_stream(),
2804 "DTraceMethodProbes flag is not applicable for this configuration\n");
2805 return JNI_EINVAL;
2806 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2807 jio_fprintf(defaultStream::error_stream(),
2808 "DTraceAllocProbes flag is not applicable for this configuration\n");
2809 return JNI_EINVAL;
2810 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2811 jio_fprintf(defaultStream::error_stream(),
2812 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2813 return JNI_EINVAL;
2814 #endif // !defined(DTRACE_ENABLED)
2815 #ifdef ASSERT
2816 } else if (match_option(option, "-XX:+FullGCALot")) {
2817 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2818 return JNI_EINVAL;
2819 }
2820 // disable scavenge before parallel mark-compact
2821 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2822 return JNI_EINVAL;
2823 }
2824 #endif
2825 #if !INCLUDE_MANAGEMENT
2826 } else if (match_option(option, "-XX:+ManagementServer")) {
2827 jio_fprintf(defaultStream::error_stream(),
2828 "ManagementServer is not supported in this VM.\n");
2829 return JNI_ERR;
2830 #endif // INCLUDE_MANAGEMENT
2831 #if INCLUDE_JVMCI
2832 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2833 if (EnableJVMCIProduct) {
2834 jio_fprintf(defaultStream::error_stream(),
2835 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2836 return JNI_EINVAL;
2837 }
2838 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2839 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2840 if (use_graal_jit) {
2841 const char* jvmci_compiler = get_property("jvmci.Compiler");
2842 if (jvmci_compiler != nullptr) {
2843 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2844 jio_fprintf(defaultStream::error_stream(),
2845 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2846 return JNI_ERR;
2847 }
2848 } else if (!add_property("jvmci.Compiler=graal")) {
2849 return JNI_ENOMEM;
2850 }
2851 }
2852
2853 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2854 if (EnableJVMCIProduct) {
2855 continue;
2856 }
2857 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2858 // Allow this flag if it has been unlocked.
2859 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2860 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2861 jio_fprintf(defaultStream::error_stream(),
2862 "Unable to enable JVMCI in product mode\n");
2863 return JNI_ERR;
2864 }
2865 }
2866 // The flag was locked so process normally to report that error
2867 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2868 return JNI_EINVAL;
2869 }
2870 #endif // INCLUDE_JVMCI
2871 #if INCLUDE_JFR
2872 } else if (match_jfr_option(&option)) {
2873 return JNI_EINVAL;
2874 #endif
2875 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2876 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2877 // already been handled
2878 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2879 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2880 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2881 return JNI_EINVAL;
2882 }
2883 }
2884 // Unknown option
2885 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2886 return JNI_ERR;
2887 }
2888 }
2889
2890 // PrintSharedArchiveAndExit will turn on
2891 // -Xshare:on
2892 // -Xlog:class+path=info
2893 if (PrintSharedArchiveAndExit) {
2894 UseSharedSpaces = true;
2895 RequireSharedSpaces = true;
2896 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2897 }
2898
2899 fix_appclasspath();
2900
2901 return JNI_OK;
2902 }
2903
2904 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
2905 // For java.base check for duplicate --patch-module options being specified on the command line.
2906 // This check is only required for java.base, all other duplicate module specifications
2907 // will be checked during module system initialization. The module system initialization
2908 // will throw an ExceptionInInitializerError if this situation occurs.
2909 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2910 if (*patch_mod_javabase) {
2911 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2912 } else {
2913 *patch_mod_javabase = true;
2914 }
2915 }
2916
2917 // Create GrowableArray lazily, only if --patch-module has been specified
2918 if (_patch_mod_prefix == nullptr) {
2919 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2920 }
2921
2922 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2923 }
2924
2925 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2926 //
2927 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2928 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2929 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2930 // path is treated as the current directory.
2931 //
2932 // This causes problems with CDS, which requires that all directories specified in the classpath
2933 // must be empty. In most cases, applications do NOT want to load classes from the current
2934 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2935 // scripts compatible with CDS.
2936 void Arguments::fix_appclasspath() {
2937 if (IgnoreEmptyClassPaths) {
2938 const char separator = *os::path_separator();
2939 const char* src = _java_class_path->value();
2940
2941 // skip over all the leading empty paths
2942 while (*src == separator) {
2943 src ++;
2944 }
2945
2946 char* copy = os::strdup_check_oom(src, mtArguments);
2947
2948 // trim all trailing empty paths
2949 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2950 *tail = '\0';
2951 }
2952
2953 char from[3] = {separator, separator, '\0'};
2954 char to [2] = {separator, '\0'};
2955 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2956 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2957 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2958 }
2959
2960 _java_class_path->set_writeable_value(copy);
2961 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2962 }
2963 }
2964
2965 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
2966 // check if the default lib/endorsed directory exists; if so, error
2967 char path[JVM_MAXPATHLEN];
2968 const char* fileSep = os::file_separator();
2969 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2970
2971 DIR* dir = os::opendir(path);
2972 if (dir != nullptr) {
2973 jio_fprintf(defaultStream::output_stream(),
2974 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2975 "in modular form will be supported via the concept of upgradeable modules.\n");
2976 os::closedir(dir);
2977 return JNI_ERR;
2978 }
2979
2980 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2981 dir = os::opendir(path);
2982 if (dir != nullptr) {
2983 jio_fprintf(defaultStream::output_stream(),
2984 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2985 "Use -classpath instead.\n.");
2986 os::closedir(dir);
2987 return JNI_ERR;
2988 }
2989
2990 // This must be done after all arguments have been processed
2991 // and the container support has been initialized since AggressiveHeap
2992 // relies on the amount of total memory available.
2993 if (AggressiveHeap) {
2994 jint result = set_aggressive_heap_flags();
2995 if (result != JNI_OK) {
2996 return result;
2997 }
2998 }
2999
3000 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3001 // but like -Xint, leave compilation thresholds unaffected.
3002 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3003 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3004 set_mode_flags(_int);
3005 }
3006
3007 #ifdef ZERO
3008 // Zero always runs in interpreted mode
3009 set_mode_flags(_int);
3010 #endif
3011
3012 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3013 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3014 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3015 }
3016
3017 #if !COMPILER2_OR_JVMCI
3018 // Don't degrade server performance for footprint
3019 if (FLAG_IS_DEFAULT(UseLargePages) &&
3020 MaxHeapSize < LargePageHeapSizeThreshold) {
3021 // No need for large granularity pages w/small heaps.
3022 // Note that large pages are enabled/disabled for both the
3023 // Java heap and the code cache.
3024 FLAG_SET_DEFAULT(UseLargePages, false);
3025 }
3026
3027 UNSUPPORTED_OPTION(ProfileInterpreter);
3028 #endif
3029
3030 // Parse the CompilationMode flag
3031 if (!CompilationModeFlag::initialize()) {
3032 return JNI_ERR;
3033 }
3034
3035 if (!check_vm_args_consistency()) {
3036 return JNI_ERR;
3037 }
3038
3039 #if INCLUDE_CDS
3040 if (CDSConfig::is_dumping_static_archive()) {
3041 if (!mode_flag_cmd_line) {
3042 // By default, -Xshare:dump runs in interpreter-only mode, which is required for deterministic archive.
3043 //
3044 // If your classlist is large and you don't care about deterministic dumping, you can use
3045 // -Xshare:dump -Xmixed to improve dumping speed.
3046 set_mode_flags(_int);
3047 } else if (_mode == _comp) {
3048 // -Xcomp may use excessive CPU for the test tiers. Also, -Xshare:dump runs a small and fixed set of
3049 // Java code, so there's not much benefit in running -Xcomp.
3050 log_info(cds)("reduced -Xcomp to -Xmixed for static dumping");
3051 set_mode_flags(_mixed);
3052 }
3053
3054 // String deduplication may cause CDS to iterate the strings in different order from one
3055 // run to another which resulting in non-determinstic CDS archives.
3056 // Disable UseStringDeduplication while dumping CDS archive.
3057 UseStringDeduplication = false;
3058 }
3059
3060 // RecordDynamicDumpInfo is not compatible with ArchiveClassesAtExit
3061 if (ArchiveClassesAtExit != nullptr && RecordDynamicDumpInfo) {
3062 jio_fprintf(defaultStream::output_stream(),
3063 "-XX:+RecordDynamicDumpInfo cannot be used with -XX:ArchiveClassesAtExit.\n");
3064 return JNI_ERR;
3065 }
3066
3067 if (ArchiveClassesAtExit == nullptr && !RecordDynamicDumpInfo) {
3068 CDSConfig::disable_dumping_dynamic_archive();
3069 } else {
3070 CDSConfig::enable_dumping_dynamic_archive();
3071 }
3072
3073 if (AutoCreateSharedArchive) {
3074 if (SharedArchiveFile == nullptr) {
3075 log_warning(cds)("-XX:+AutoCreateSharedArchive requires -XX:SharedArchiveFile");
3076 return JNI_ERR;
3077 }
3078 if (ArchiveClassesAtExit != nullptr) {
3079 log_warning(cds)("-XX:+AutoCreateSharedArchive does not work with ArchiveClassesAtExit");
3080 return JNI_ERR;
3081 }
3082 }
3083
3084 if (UseSharedSpaces && patch_mod_javabase) {
3085 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3086 }
3087 if (UseSharedSpaces && check_unsupported_cds_runtime_properties()) {
3088 UseSharedSpaces = false;
3089 }
3090
3091 if (CDSConfig::is_dumping_archive()) {
3092 // Always verify non-system classes during CDS dump
3093 if (!BytecodeVerificationRemote) {
3094 BytecodeVerificationRemote = true;
3095 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3096 }
3097 }
3098 #endif
3099
3100 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3101 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3102 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3103
3104 return JNI_OK;
3105 }
3106
3107 // Helper class for controlling the lifetime of JavaVMInitArgs
3108 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3109 // deleted on the destruction of the ScopedVMInitArgs object.
3110 class ScopedVMInitArgs : public StackObj {
3111 private:
3112 JavaVMInitArgs _args;
3113 char* _container_name;
3114 bool _is_set;
3115 char* _vm_options_file_arg;
3116
3117 public:
3118 ScopedVMInitArgs(const char *container_name) {
3119 _args.version = JNI_VERSION_1_2;
3120 _args.nOptions = 0;
3121 _args.options = nullptr;
3122 _args.ignoreUnrecognized = false;
3123 _container_name = (char *)container_name;
3124 _is_set = false;
3125 _vm_options_file_arg = nullptr;
3126 }
3127
3128 // Populates the JavaVMInitArgs object represented by this
3129 // ScopedVMInitArgs object with the arguments in options. The
3130 // allocated memory is deleted by the destructor. If this method
3131 // returns anything other than JNI_OK, then this object is in a
3132 // partially constructed state, and should be abandoned.
3133 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3134 _is_set = true;
3135 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3136 JavaVMOption, options->length(), mtArguments);
3137 if (options_arr == nullptr) {
3138 return JNI_ENOMEM;
3139 }
3140 _args.options = options_arr;
3141
3142 for (int i = 0; i < options->length(); i++) {
3143 options_arr[i] = options->at(i);
3144 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3145 if (options_arr[i].optionString == nullptr) {
3146 // Rely on the destructor to do cleanup.
3147 _args.nOptions = i;
3148 return JNI_ENOMEM;
3149 }
3150 }
3151
3152 _args.nOptions = options->length();
3153 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3154 return JNI_OK;
3155 }
3156
3157 JavaVMInitArgs* get() { return &_args; }
3158 char* container_name() { return _container_name; }
3159 bool is_set() { return _is_set; }
3160 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3161 char* vm_options_file_arg() { return _vm_options_file_arg; }
3162
3163 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3164 if (_vm_options_file_arg != nullptr) {
3165 os::free(_vm_options_file_arg);
3166 }
3167 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3168 }
3169
3170 ~ScopedVMInitArgs() {
3171 if (_vm_options_file_arg != nullptr) {
3172 os::free(_vm_options_file_arg);
3173 }
3174 if (_args.options == nullptr) return;
3175 for (int i = 0; i < _args.nOptions; i++) {
3176 os::free(_args.options[i].optionString);
3177 }
3178 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3179 }
3180
3181 // Insert options into this option list, to replace option at
3182 // vm_options_file_pos (-XX:VMOptionsFile)
3183 jint insert(const JavaVMInitArgs* args,
3184 const JavaVMInitArgs* args_to_insert,
3185 const int vm_options_file_pos) {
3186 assert(_args.options == nullptr, "shouldn't be set yet");
3187 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3188 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3189
3190 int length = args->nOptions + args_to_insert->nOptions - 1;
3191 // Construct new option array
3192 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3193 for (int i = 0; i < args->nOptions; i++) {
3194 if (i == vm_options_file_pos) {
3195 // insert the new options starting at the same place as the
3196 // -XX:VMOptionsFile option
3197 for (int j = 0; j < args_to_insert->nOptions; j++) {
3198 options.push(args_to_insert->options[j]);
3199 }
3200 } else {
3201 options.push(args->options[i]);
3202 }
3203 }
3204 // make into options array
3205 return set_args(&options);
3206 }
3207 };
3208
3209 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3210 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3211 }
3212
3213 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3214 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3215 }
3216
3217 jint Arguments::parse_options_environment_variable(const char* name,
3218 ScopedVMInitArgs* vm_args) {
3219 char *buffer = ::getenv(name);
3220
3221 // Don't check this environment variable if user has special privileges
3222 // (e.g. unix su command).
3223 if (buffer == nullptr || os::have_special_privileges()) {
3224 return JNI_OK;
3225 }
3226
3227 if ((buffer = os::strdup(buffer)) == nullptr) {
3228 return JNI_ENOMEM;
3229 }
3230
3231 jio_fprintf(defaultStream::error_stream(),
3232 "Picked up %s: %s\n", name, buffer);
3233
3234 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3235
3236 os::free(buffer);
3237 return retcode;
3238 }
3239
3240 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3241 // read file into buffer
3242 int fd = ::open(file_name, O_RDONLY);
3243 if (fd < 0) {
3244 jio_fprintf(defaultStream::error_stream(),
3245 "Could not open options file '%s'\n",
3246 file_name);
3247 return JNI_ERR;
3248 }
3249
3250 struct stat stbuf;
3251 int retcode = os::stat(file_name, &stbuf);
3252 if (retcode != 0) {
3253 jio_fprintf(defaultStream::error_stream(),
3254 "Could not stat options file '%s'\n",
3255 file_name);
3256 ::close(fd);
3257 return JNI_ERR;
3258 }
3259
3260 if (stbuf.st_size == 0) {
3261 // tell caller there is no option data and that is ok
3262 ::close(fd);
3263 return JNI_OK;
3264 }
3265
3266 // '+ 1' for null termination even with max bytes
3267 size_t bytes_alloc = stbuf.st_size + 1;
3268
3269 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3270 if (nullptr == buf) {
3271 jio_fprintf(defaultStream::error_stream(),
3272 "Could not allocate read buffer for options file parse\n");
3273 ::close(fd);
3274 return JNI_ENOMEM;
3275 }
3276
3277 memset(buf, 0, bytes_alloc);
3278
3279 // Fill buffer
3280 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3281 ::close(fd);
3282 if (bytes_read < 0) {
3283 FREE_C_HEAP_ARRAY(char, buf);
3284 jio_fprintf(defaultStream::error_stream(),
3285 "Could not read options file '%s'\n", file_name);
3286 return JNI_ERR;
3287 }
3288
3289 if (bytes_read == 0) {
3290 // tell caller there is no option data and that is ok
3291 FREE_C_HEAP_ARRAY(char, buf);
3292 return JNI_OK;
3293 }
3294
3295 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3296
3297 FREE_C_HEAP_ARRAY(char, buf);
3298 return retcode;
3299 }
3300
3301 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3302 // Construct option array
3303 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3304
3305 // some pointers to help with parsing
3306 char *buffer_end = buffer + buf_len;
3307 char *opt_hd = buffer;
3308 char *wrt = buffer;
3309 char *rd = buffer;
3310
3311 // parse all options
3312 while (rd < buffer_end) {
3313 // skip leading white space from the input string
3314 while (rd < buffer_end && isspace(*rd)) {
3315 rd++;
3316 }
3317
3318 if (rd >= buffer_end) {
3319 break;
3320 }
3321
3322 // Remember this is where we found the head of the token.
3323 opt_hd = wrt;
3324
3325 // Tokens are strings of non white space characters separated
3326 // by one or more white spaces.
3327 while (rd < buffer_end && !isspace(*rd)) {
3328 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3329 int quote = *rd; // matching quote to look for
3330 rd++; // don't copy open quote
3331 while (rd < buffer_end && *rd != quote) {
3332 // include everything (even spaces)
3333 // up until the close quote
3334 *wrt++ = *rd++; // copy to option string
3335 }
3336
3337 if (rd < buffer_end) {
3338 rd++; // don't copy close quote
3339 } else {
3340 // did not see closing quote
3341 jio_fprintf(defaultStream::error_stream(),
3342 "Unmatched quote in %s\n", name);
3343 return JNI_ERR;
3344 }
3345 } else {
3346 *wrt++ = *rd++; // copy to option string
3347 }
3348 }
3349
3350 // steal a white space character and set it to null
3351 *wrt++ = '\0';
3352 // We now have a complete token
3353
3354 JavaVMOption option;
3355 option.optionString = opt_hd;
3356 option.extraInfo = nullptr;
3357
3358 options.append(option); // Fill in option
3359
3360 rd++; // Advance to next character
3361 }
3362
3363 // Fill out JavaVMInitArgs structure.
3364 return vm_args->set_args(&options);
3365 }
3366
3367 void Arguments::set_shared_spaces_flags_and_archive_paths() {
3368 if (CDSConfig::is_dumping_static_archive()) {
3369 if (RequireSharedSpaces) {
3370 warning("Cannot dump shared archive while using shared archive");
3371 }
3372 UseSharedSpaces = false;
3373 }
3374 #if INCLUDE_CDS
3375 // Initialize shared archive paths which could include both base and dynamic archive paths
3376 // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properly.
3377 //
3378 // UseSharedSpaces may be disabled if -XX:SharedArchiveFile is invalid.
3379 if (CDSConfig::is_dumping_static_archive() || UseSharedSpaces) {
3380 init_shared_archive_paths();
3381 }
3382 #endif // INCLUDE_CDS
3383 }
3384
3385 #if INCLUDE_CDS
3386 // Sharing support
3387 // Construct the path to the archive
3388 char* Arguments::get_default_shared_archive_path() {
3389 if (_default_shared_archive_path == nullptr) {
3390 char jvm_path[JVM_MAXPATHLEN];
3391 os::jvm_path(jvm_path, sizeof(jvm_path));
3392 char *end = strrchr(jvm_path, *os::file_separator());
3393 if (end != nullptr) *end = '\0';
3394 size_t jvm_path_len = strlen(jvm_path);
3395 size_t file_sep_len = strlen(os::file_separator());
3396 const size_t len = jvm_path_len + file_sep_len + 20;
3397 _default_shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3398 jio_snprintf(_default_shared_archive_path, len,
3399 LP64_ONLY(!UseCompressedOops ? "%s%sclasses_nocoops.jsa":) "%s%sclasses.jsa",
3400 jvm_path, os::file_separator());
3401 }
3402 return _default_shared_archive_path;
3403 }
3404
3405 int Arguments::num_archives(const char* archive_path) {
3406 if (archive_path == nullptr) {
3407 return 0;
3408 }
3409 int npaths = 1;
3410 char* p = (char*)archive_path;
3411 while (*p != '\0') {
3412 if (*p == os::path_separator()[0]) {
3413 npaths++;
3414 }
3415 p++;
3416 }
3417 return npaths;
3418 }
3419
3420 void Arguments::extract_shared_archive_paths(const char* archive_path,
3421 char** base_archive_path,
3422 char** top_archive_path) {
3423 char* begin_ptr = (char*)archive_path;
3424 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3425 if (end_ptr == nullptr || end_ptr == begin_ptr) {
3426 vm_exit_during_initialization("Base archive was not specified", archive_path);
3427 }
3428 size_t len = end_ptr - begin_ptr;
3429 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3430 strncpy(cur_path, begin_ptr, len);
3431 cur_path[len] = '\0';
3432 *base_archive_path = cur_path;
3433
3434 begin_ptr = ++end_ptr;
3435 if (*begin_ptr == '\0') {
3436 vm_exit_during_initialization("Top archive was not specified", archive_path);
3437 }
3438 end_ptr = strchr(begin_ptr, '\0');
3439 assert(end_ptr != nullptr, "sanity");
3440 len = end_ptr - begin_ptr;
3441 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3442 strncpy(cur_path, begin_ptr, len + 1);
3443 *top_archive_path = cur_path;
3444 }
3445
3446 void Arguments::init_shared_archive_paths() {
3447 if (ArchiveClassesAtExit != nullptr) {
3448 assert(!RecordDynamicDumpInfo, "already checked");
3449 if (CDSConfig::is_dumping_static_archive()) {
3450 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3451 }
3452 check_unsupported_dumping_properties();
3453
3454 if (os::same_files(get_default_shared_archive_path(), ArchiveClassesAtExit)) {
3455 vm_exit_during_initialization(
3456 "Cannot specify the default CDS archive for -XX:ArchiveClassesAtExit", get_default_shared_archive_path());
3457 }
3458 }
3459
3460 if (SharedArchiveFile == nullptr) {
3461 SharedArchivePath = get_default_shared_archive_path();
3462 } else {
3463 int archives = num_archives(SharedArchiveFile);
3464 assert(archives > 0, "must be");
3465
3466 if (CDSConfig::is_dumping_archive() && archives > 1) {
3467 vm_exit_during_initialization(
3468 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3469 }
3470
3471 if (CDSConfig::is_dumping_static_archive()) {
3472 assert(archives == 1, "must be");
3473 // Static dump is simple: only one archive is allowed in SharedArchiveFile. This file
3474 // will be overwritten no matter regardless of its contents
3475 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3476 } else {
3477 // SharedArchiveFile may specify one or two files. In case (c), the path for base.jsa
3478 // is read from top.jsa
3479 // (a) 1 file: -XX:SharedArchiveFile=base.jsa
3480 // (b) 2 files: -XX:SharedArchiveFile=base.jsa:top.jsa
3481 // (c) 2 files: -XX:SharedArchiveFile=top.jsa
3482 //
3483 // However, if either RecordDynamicDumpInfo or ArchiveClassesAtExit is used, we do not
3484 // allow cases (b) and (c). Case (b) is already checked above.
3485
3486 if (archives > 2) {
3487 vm_exit_during_initialization(
3488 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3489 }
3490 if (archives == 1) {
3491 char* base_archive_path = nullptr;
3492 bool success =
3493 FileMapInfo::get_base_archive_name_from_header(SharedArchiveFile, &base_archive_path);
3494 if (!success) {
3495 // If +AutoCreateSharedArchive and the specified shared archive does not exist,
3496 // regenerate the dynamic archive base on default archive.
3497 if (AutoCreateSharedArchive && !os::file_exists(SharedArchiveFile)) {
3498 CDSConfig::enable_dumping_dynamic_archive();
3499 ArchiveClassesAtExit = const_cast<char *>(SharedArchiveFile);
3500 SharedArchivePath = get_default_shared_archive_path();
3501 SharedArchiveFile = nullptr;
3502 } else {
3503 if (AutoCreateSharedArchive) {
3504 warning("-XX:+AutoCreateSharedArchive is unsupported when base CDS archive is not loaded. Run with -Xlog:cds for more info.");
3505 AutoCreateSharedArchive = false;
3506 }
3507 no_shared_spaces("invalid archive");
3508 }
3509 } else if (base_archive_path == nullptr) {
3510 // User has specified a single archive, which is a static archive.
3511 SharedArchivePath = const_cast<char *>(SharedArchiveFile);
3512 } else {
3513 // User has specified a single archive, which is a dynamic archive.
3514 SharedDynamicArchivePath = const_cast<char *>(SharedArchiveFile);
3515 SharedArchivePath = base_archive_path; // has been c-heap allocated.
3516 }
3517 } else {
3518 extract_shared_archive_paths((const char*)SharedArchiveFile,
3519 &SharedArchivePath, &SharedDynamicArchivePath);
3520 if (SharedArchivePath == nullptr) {
3521 assert(SharedDynamicArchivePath == nullptr, "must be");
3522 no_shared_spaces("invalid archive");
3523 }
3524 }
3525
3526 if (SharedDynamicArchivePath != nullptr) {
3527 // Check for case (c)
3528 if (RecordDynamicDumpInfo) {
3529 vm_exit_during_initialization("-XX:+RecordDynamicDumpInfo is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
3530 SharedArchiveFile);
3531 }
3532 if (ArchiveClassesAtExit != nullptr) {
3533 vm_exit_during_initialization("-XX:ArchiveClassesAtExit is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
3534 SharedArchiveFile);
3535 }
3536 }
3537
3538 if (ArchiveClassesAtExit != nullptr && os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3539 vm_exit_during_initialization(
3540 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3541 SharedArchiveFile);
3542 }
3543 }
3544 }
3545 }
3546 #endif // INCLUDE_CDS
3547
3548 #ifndef PRODUCT
3549 // Determine whether LogVMOutput should be implicitly turned on.
3550 static bool use_vm_log() {
3551 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3552 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3553 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3554 PrintAssembly || TraceDeoptimization ||
3555 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3556 return true;
3557 }
3558
3559 #ifdef COMPILER1
3560 if (PrintC1Statistics) {
3561 return true;
3562 }
3563 #endif // COMPILER1
3564
3565 #ifdef COMPILER2
3566 if (PrintOptoAssembly || PrintOptoStatistics) {
3567 return true;
3568 }
3569 #endif // COMPILER2
3570
3571 return false;
3572 }
3573
3574 #endif // PRODUCT
3575
3576 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3577 for (int index = 0; index < args->nOptions; index++) {
3578 const JavaVMOption* option = args->options + index;
3579 const char* tail;
3580 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3581 return true;
3582 }
3583 }
3584 return false;
3585 }
3586
3587 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3588 const char* vm_options_file,
3589 const int vm_options_file_pos,
3590 ScopedVMInitArgs* vm_options_file_args,
3591 ScopedVMInitArgs* args_out) {
3592 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3593 if (code != JNI_OK) {
3594 return code;
3595 }
3596
3597 if (vm_options_file_args->get()->nOptions < 1) {
3598 return JNI_OK;
3599 }
3600
3601 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3602 jio_fprintf(defaultStream::error_stream(),
3603 "A VM options file may not refer to a VM options file. "
3604 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3605 "options file '%s' in options container '%s' is an error.\n",
3606 vm_options_file_args->vm_options_file_arg(),
3607 vm_options_file_args->container_name());
3608 return JNI_EINVAL;
3609 }
3610
3611 return args_out->insert(args, vm_options_file_args->get(),
3612 vm_options_file_pos);
3613 }
3614
3615 // Expand -XX:VMOptionsFile found in args_in as needed.
3616 // mod_args and args_out parameters may return values as needed.
3617 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3618 ScopedVMInitArgs* mod_args,
3619 JavaVMInitArgs** args_out) {
3620 jint code = match_special_option_and_act(args_in, mod_args);
3621 if (code != JNI_OK) {
3622 return code;
3623 }
3624
3625 if (mod_args->is_set()) {
3626 // args_in contains -XX:VMOptionsFile and mod_args contains the
3627 // original options from args_in along with the options expanded
3628 // from the VMOptionsFile. Return a short-hand to the caller.
3629 *args_out = mod_args->get();
3630 } else {
3631 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3632 }
3633 return JNI_OK;
3634 }
3635
3636 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3637 ScopedVMInitArgs* args_out) {
3638 // Remaining part of option string
3639 const char* tail;
3640 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3641
3642 for (int index = 0; index < args->nOptions; index++) {
3643 const JavaVMOption* option = args->options + index;
3644 if (match_option(option, "-XX:Flags=", &tail)) {
3645 Arguments::set_jvm_flags_file(tail);
3646 continue;
3647 }
3648 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3649 if (vm_options_file_args.found_vm_options_file_arg()) {
3650 jio_fprintf(defaultStream::error_stream(),
3651 "The option '%s' is already specified in the options "
3652 "container '%s' so the specification of '%s' in the "
3653 "same options container is an error.\n",
3654 vm_options_file_args.vm_options_file_arg(),
3655 vm_options_file_args.container_name(),
3656 option->optionString);
3657 return JNI_EINVAL;
3658 }
3659 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3660 // If there's a VMOptionsFile, parse that
3661 jint code = insert_vm_options_file(args, tail, index,
3662 &vm_options_file_args, args_out);
3663 if (code != JNI_OK) {
3664 return code;
3665 }
3666 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3667 if (args_out->is_set()) {
3668 // The VMOptions file inserted some options so switch 'args'
3669 // to the new set of options, and continue processing which
3670 // preserves "last option wins" semantics.
3671 args = args_out->get();
3672 // The first option from the VMOptionsFile replaces the
3673 // current option. So we back track to process the
3674 // replacement option.
3675 index--;
3676 }
3677 continue;
3678 }
3679 if (match_option(option, "-XX:+PrintVMOptions")) {
3680 PrintVMOptions = true;
3681 continue;
3682 }
3683 if (match_option(option, "-XX:-PrintVMOptions")) {
3684 PrintVMOptions = false;
3685 continue;
3686 }
3687 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3688 IgnoreUnrecognizedVMOptions = true;
3689 continue;
3690 }
3691 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3692 IgnoreUnrecognizedVMOptions = false;
3693 continue;
3694 }
3695 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3696 JVMFlag::printFlags(tty, false);
3697 vm_exit(0);
3698 }
3699
3700 #ifndef PRODUCT
3701 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3702 JVMFlag::printFlags(tty, true);
3703 vm_exit(0);
3704 }
3705 #endif
3706 }
3707 return JNI_OK;
3708 }
3709
3710 static void print_options(const JavaVMInitArgs *args) {
3711 const char* tail;
3712 for (int index = 0; index < args->nOptions; index++) {
3713 const JavaVMOption *option = args->options + index;
3714 if (match_option(option, "-XX:", &tail)) {
3715 logOption(tail);
3716 }
3717 }
3718 }
3719
3720 bool Arguments::handle_deprecated_print_gc_flags() {
3721 if (PrintGC) {
3722 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3723 }
3724 if (PrintGCDetails) {
3725 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3726 }
3727
3728 if (_legacyGCLogging.lastFlag == 2) {
3729 // -Xloggc was used to specify a filename
3730 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3731
3732 LogTarget(Error, logging) target;
3733 LogStream errstream(target);
3734 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3735 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3736 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3737 }
3738 return true;
3739 }
3740
3741 static void apply_debugger_ergo() {
3742 #ifndef PRODUCT
3743 // UseDebuggerErgo is notproduct
3744 if (ReplayCompiles) {
3745 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3746 }
3747 #endif
3748
3749 #ifndef PRODUCT
3750 if (UseDebuggerErgo) {
3751 // Turn on sub-flags
3752 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3753 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3754 }
3755 #endif
3756
3757 if (UseDebuggerErgo2) {
3758 // Debugging with limited number of CPUs
3759 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3760 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3761 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3762 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3763 }
3764 }
3765
3766 // Parse entry point called from JNI_CreateJavaVM
3767
3768 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3769 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3770 JVMFlag::check_all_flag_declarations();
3771
3772 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3773 const char* hotspotrc = ".hotspotrc";
3774 bool settings_file_specified = false;
3775 bool needs_hotspotrc_warning = false;
3776 ScopedVMInitArgs initial_vm_options_args("");
3777 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3778 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3779
3780 // Pointers to current working set of containers
3781 JavaVMInitArgs* cur_cmd_args;
3782 JavaVMInitArgs* cur_vm_options_args;
3783 JavaVMInitArgs* cur_java_options_args;
3784 JavaVMInitArgs* cur_java_tool_options_args;
3785
3786 // Containers for modified/expanded options
3787 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3788 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3789 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3790 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3791
3792
3793 jint code =
3794 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3795 if (code != JNI_OK) {
3796 return code;
3797 }
3798
3799 code = parse_java_options_environment_variable(&initial_java_options_args);
3800 if (code != JNI_OK) {
3801 return code;
3802 }
3803
3804 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3805 char *vmoptions = ClassLoader::lookup_vm_options();
3806 if (vmoptions != nullptr) {
3807 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3808 FREE_C_HEAP_ARRAY(char, vmoptions);
3809 if (code != JNI_OK) {
3810 return code;
3811 }
3812 }
3813
3814 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3815 &mod_java_tool_options_args,
3816 &cur_java_tool_options_args);
3817 if (code != JNI_OK) {
3818 return code;
3819 }
3820
3821 code = expand_vm_options_as_needed(initial_cmd_args,
3822 &mod_cmd_args,
3823 &cur_cmd_args);
3824 if (code != JNI_OK) {
3825 return code;
3826 }
3827
3828 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3829 &mod_java_options_args,
3830 &cur_java_options_args);
3831 if (code != JNI_OK) {
3832 return code;
3833 }
3834
3835 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3836 &mod_vm_options_args,
3837 &cur_vm_options_args);
3838 if (code != JNI_OK) {
3839 return code;
3840 }
3841
3842 const char* flags_file = Arguments::get_jvm_flags_file();
3843 settings_file_specified = (flags_file != nullptr);
3844
3845 if (IgnoreUnrecognizedVMOptions) {
3846 cur_cmd_args->ignoreUnrecognized = true;
3847 cur_java_tool_options_args->ignoreUnrecognized = true;
3848 cur_java_options_args->ignoreUnrecognized = true;
3849 }
3850
3851 // Parse specified settings file
3852 if (settings_file_specified) {
3853 if (!process_settings_file(flags_file, true,
3854 cur_cmd_args->ignoreUnrecognized)) {
3855 return JNI_EINVAL;
3856 }
3857 } else {
3858 #ifdef ASSERT
3859 // Parse default .hotspotrc settings file
3860 if (!process_settings_file(".hotspotrc", false,
3861 cur_cmd_args->ignoreUnrecognized)) {
3862 return JNI_EINVAL;
3863 }
3864 #else
3865 struct stat buf;
3866 if (os::stat(hotspotrc, &buf) == 0) {
3867 needs_hotspotrc_warning = true;
3868 }
3869 #endif
3870 }
3871
3872 if (PrintVMOptions) {
3873 print_options(cur_java_tool_options_args);
3874 print_options(cur_cmd_args);
3875 print_options(cur_java_options_args);
3876 }
3877
3878 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3879 jint result = parse_vm_init_args(cur_vm_options_args,
3880 cur_java_tool_options_args,
3881 cur_java_options_args,
3882 cur_cmd_args);
3883
3884 if (result != JNI_OK) {
3885 return result;
3886 }
3887
3888 // Delay warning until here so that we've had a chance to process
3889 // the -XX:-PrintWarnings flag
3890 if (needs_hotspotrc_warning) {
3891 warning("%s file is present but has been ignored. "
3892 "Run with -XX:Flags=%s to load the file.",
3893 hotspotrc, hotspotrc);
3894 }
3895
3896 if (needs_module_property_warning) {
3897 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3898 " names that are reserved for internal use.");
3899 }
3900
3901 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3902 UNSUPPORTED_OPTION(UseLargePages);
3903 #endif
3904
3905 #if defined(AIX)
3906 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3907 #endif
3908
3909 #ifndef PRODUCT
3910 if (TraceBytecodesAt != 0) {
3911 TraceBytecodes = true;
3912 }
3913 #endif // PRODUCT
3914
3915 if (ScavengeRootsInCode == 0) {
3916 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3917 warning("Forcing ScavengeRootsInCode non-zero");
3918 }
3919 ScavengeRootsInCode = 1;
3920 }
3921
3922 if (!handle_deprecated_print_gc_flags()) {
3923 return JNI_EINVAL;
3924 }
3925
3926 // Set object alignment values.
3927 set_object_alignment();
3928
3929 #if !INCLUDE_CDS
3930 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3931 jio_fprintf(defaultStream::error_stream(),
3932 "Shared spaces are not supported in this VM\n");
3933 return JNI_ERR;
3934 }
3935 if (DumpLoadedClassList != nullptr) {
3936 jio_fprintf(defaultStream::error_stream(),
3937 "DumpLoadedClassList is not supported in this VM\n");
3938 return JNI_ERR;
3939 }
3940 if ((UseSharedSpaces && xshare_auto_cmd_line) ||
3941 log_is_enabled(Info, cds)) {
3942 warning("Shared spaces are not supported in this VM");
3943 UseSharedSpaces = false;
3944 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3945 }
3946 no_shared_spaces("CDS Disabled");
3947 #endif // INCLUDE_CDS
3948
3949 // Verify NMT arguments
3950 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3951 if (lvl == NMT_unknown) {
3952 jio_fprintf(defaultStream::error_stream(),
3953 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3954 return JNI_ERR;
3955 }
3956 if (PrintNMTStatistics && lvl == NMT_off) {
3957 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3958 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3959 }
3960
3961 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3962 if (trace_dependencies && VerifyDependencies) {
3963 warning("dependency logging results may be inflated by VerifyDependencies");
3964 }
3965
3966 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3967 log_is_enabled(Info, class, load, cause);
3968 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3969 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3970 }
3971
3972 apply_debugger_ergo();
3973
3974 if (log_is_enabled(Info, arguments)) {
3975 LogStream st(Log(arguments)::info());
3976 Arguments::print_on(&st);
3977 }
3978
3979 return JNI_OK;
3980 }
3981
3982 jint Arguments::apply_ergo() {
3983 // Set flags based on ergonomics.
3984 jint result = set_ergonomics_flags();
3985 if (result != JNI_OK) return result;
3986
3987 // Set heap size based on available physical memory
3988 set_heap_size();
3989
3990 GCConfig::arguments()->initialize();
3991
3992 set_shared_spaces_flags_and_archive_paths();
3993
3994 // Initialize Metaspace flags and alignments
3995 Metaspace::ergo_initialize();
3996
3997 if (!StringDedup::ergo_initialize()) {
3998 return JNI_EINVAL;
3999 }
4000
4001 // Set compiler flags after GC is selected and GC specific
4002 // flags (LoopStripMiningIter) are set.
4003 CompilerConfig::ergo_initialize();
4004
4005 // Set bytecode rewriting flags
4006 set_bytecode_flags();
4007
4008 // Set flags if aggressive optimization flags are enabled
4009 jint code = set_aggressive_opts_flags();
4010 if (code != JNI_OK) {
4011 return code;
4012 }
4013
4014 #ifdef ZERO
4015 // Clear flags not supported on zero.
4016 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4017 #endif // ZERO
4018
4019 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4020 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4021 DebugNonSafepoints = true;
4022 }
4023
4024 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4025 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4026 }
4027
4028 // Treat the odd case where local verification is enabled but remote
4029 // verification is not as if both were enabled.
4030 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4031 log_info(verification)("Turning on remote verification because local verification is on");
4032 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4033 }
4034
4035 #ifndef PRODUCT
4036 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4037 if (use_vm_log()) {
4038 LogVMOutput = true;
4039 }
4040 }
4041 #endif // PRODUCT
4042
4043 if (PrintCommandLineFlags) {
4044 JVMFlag::printSetFlags(tty);
4045 }
4046
4047 #if COMPILER2_OR_JVMCI
4048 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
4049 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
4050 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
4051 }
4052 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
4053
4054 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
4055 if (!EnableVectorReboxing) {
4056 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
4057 } else {
4058 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
4059 }
4060 }
4061 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
4062
4063 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
4064 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
4065 }
4066 FLAG_SET_DEFAULT(UseVectorStubs, false);
4067 }
4068 #endif // COMPILER2_OR_JVMCI
4069
4070 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
4071 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
4072 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
4073 }
4074 }
4075 return JNI_OK;
4076 }
4077
4078 jint Arguments::adjust_after_os() {
4079 if (UseNUMA) {
4080 if (UseParallelGC) {
4081 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4082 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4083 }
4084 }
4085 }
4086 return JNI_OK;
4087 }
4088
4089 int Arguments::PropertyList_count(SystemProperty* pl) {
4090 int count = 0;
4091 while(pl != nullptr) {
4092 count++;
4093 pl = pl->next();
4094 }
4095 return count;
4096 }
4097
4098 // Return the number of readable properties.
4099 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4100 int count = 0;
4101 while(pl != nullptr) {
4102 if (pl->readable()) {
4103 count++;
4104 }
4105 pl = pl->next();
4106 }
4107 return count;
4108 }
4109
4110 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4111 assert(key != nullptr, "just checking");
4112 SystemProperty* prop;
4113 for (prop = pl; prop != nullptr; prop = prop->next()) {
4114 if (strcmp(key, prop->key()) == 0) return prop->value();
4115 }
4116 return nullptr;
4117 }
4118
4119 // Return the value of the requested property provided that it is a readable property.
4120 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4121 assert(key != nullptr, "just checking");
4122 SystemProperty* prop;
4123 // Return the property value if the keys match and the property is not internal or
4124 // it's the special internal property "jdk.boot.class.path.append".
4125 for (prop = pl; prop != nullptr; prop = prop->next()) {
4126 if (strcmp(key, prop->key()) == 0) {
4127 if (!prop->internal()) {
4128 return prop->value();
4129 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4130 return prop->value();
4131 } else {
4132 // Property is internal and not jdk.boot.class.path.append so return null.
4133 return nullptr;
4134 }
4135 }
4136 }
4137 return nullptr;
4138 }
4139
4140 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4141 SystemProperty* p = *plist;
4142 if (p == nullptr) {
4143 *plist = new_p;
4144 } else {
4145 while (p->next() != nullptr) {
4146 p = p->next();
4147 }
4148 p->set_next(new_p);
4149 }
4150 }
4151
4152 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4153 bool writeable, bool internal) {
4154 if (plist == nullptr)
4155 return;
4156
4157 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4158 PropertyList_add(plist, new_p);
4159 }
4160
4161 void Arguments::PropertyList_add(SystemProperty *element) {
4162 PropertyList_add(&_system_properties, element);
4163 }
4164
4165 // This add maintains unique property key in the list.
4166 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4167 PropertyAppendable append, PropertyWriteable writeable,
4168 PropertyInternal internal) {
4169 if (plist == nullptr)
4170 return;
4171
4172 // If property key exists and is writeable, then update with new value.
4173 // Trying to update a non-writeable property is silently ignored.
4174 SystemProperty* prop;
4175 for (prop = *plist; prop != nullptr; prop = prop->next()) {
4176 if (strcmp(k, prop->key()) == 0) {
4177 if (append == AppendProperty) {
4178 prop->append_writeable_value(v);
4179 } else {
4180 prop->set_writeable_value(v);
4181 }
4182 return;
4183 }
4184 }
4185
4186 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4187 }
4188
4189 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4190 // Returns true if all of the source pointed by src has been copied over to
4191 // the destination buffer pointed by buf. Otherwise, returns false.
4192 // Notes:
4193 // 1. If the length (buflen) of the destination buffer excluding the
4194 // null terminator character is not long enough for holding the expanded
4195 // pid characters, it also returns false instead of returning the partially
4196 // expanded one.
4197 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4198 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4199 char* buf, size_t buflen) {
4200 const char* p = src;
4201 char* b = buf;
4202 const char* src_end = &src[srclen];
4203 char* buf_end = &buf[buflen - 1];
4204
4205 while (p < src_end && b < buf_end) {
4206 if (*p == '%') {
4207 switch (*(++p)) {
4208 case '%': // "%%" ==> "%"
4209 *b++ = *p++;
4210 break;
4211 case 'p': { // "%p" ==> current process id
4212 // buf_end points to the character before the last character so
4213 // that we could write '\0' to the end of the buffer.
4214 size_t buf_sz = buf_end - b + 1;
4215 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4216
4217 // if jio_snprintf fails or the buffer is not long enough to hold
4218 // the expanded pid, returns false.
4219 if (ret < 0 || ret >= (int)buf_sz) {
4220 return false;
4221 } else {
4222 b += ret;
4223 assert(*b == '\0', "fail in copy_expand_pid");
4224 if (p == src_end && b == buf_end + 1) {
4225 // reach the end of the buffer.
4226 return true;
4227 }
4228 }
4229 p++;
4230 break;
4231 }
4232 default :
4233 *b++ = '%';
4234 }
4235 } else {
4236 *b++ = *p++;
4237 }
4238 }
4239 *b = '\0';
4240 return (p == src_end); // return false if not all of the source was copied
4241 }