1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/aotLogging.hpp"
26 #include "cds/cds_globals.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/javaAssertions.hpp"
30 #include "classfile/moduleEntry.hpp"
31 #include "classfile/stringTable.hpp"
32 #include "classfile/symbolTable.hpp"
33 #include "compiler/compilerDefinitions.hpp"
34 #include "gc/shared/gcArguments.hpp"
35 #include "gc/shared/gcConfig.hpp"
36 #include "gc/shared/genArguments.hpp"
37 #include "gc/shared/stringdedup/stringDedup.hpp"
38 #include "gc/shared/tlab_globals.hpp"
39 #include "jvm.h"
40 #include "logging/log.hpp"
41 #include "logging/logConfiguration.hpp"
42 #include "logging/logStream.hpp"
43 #include "logging/logTag.hpp"
44 #include "memory/allocation.inline.hpp"
45 #include "nmt/nmtCommon.hpp"
46 #include "oops/compressedKlass.hpp"
47 #include "oops/instanceKlass.hpp"
48 #include "oops/objLayout.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "prims/jvmtiAgentList.hpp"
51 #include "prims/jvmtiExport.hpp"
52 #include "runtime/arguments.hpp"
53 #include "runtime/flags/jvmFlag.hpp"
54 #include "runtime/flags/jvmFlagAccess.hpp"
55 #include "runtime/flags/jvmFlagLimit.hpp"
56 #include "runtime/globals_extension.hpp"
57 #include "runtime/java.hpp"
58 #include "runtime/os.hpp"
59 #include "runtime/safepoint.hpp"
60 #include "runtime/safepointMechanism.hpp"
61 #include "runtime/synchronizer.hpp"
62 #include "runtime/vm_version.hpp"
63 #include "services/management.hpp"
64 #include "utilities/align.hpp"
65 #include "utilities/checkedCast.hpp"
66 #include "utilities/debug.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/macros.hpp"
69 #include "utilities/parseInteger.hpp"
70 #include "utilities/powerOfTwo.hpp"
71 #include "utilities/stringUtils.hpp"
72 #include "utilities/systemMemoryBarrier.hpp"
73 #if INCLUDE_JFR
74 #include "jfr/jfr.hpp"
75 #endif
76
77 #include <limits>
78 #include <string.h>
79
80 static const char _default_java_launcher[] = "generic";
81
82 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
83
84 char* Arguments::_jvm_flags_file = nullptr;
85 char** Arguments::_jvm_flags_array = nullptr;
86 int Arguments::_num_jvm_flags = 0;
87 char** Arguments::_jvm_args_array = nullptr;
88 int Arguments::_num_jvm_args = 0;
89 unsigned int Arguments::_addmods_count = 0;
90 #if INCLUDE_JVMCI
91 bool Arguments::_jvmci_module_added = false;
92 #endif
93 char* Arguments::_java_command = nullptr;
94 SystemProperty* Arguments::_system_properties = nullptr;
95 size_t Arguments::_conservative_max_heap_alignment = 0;
96 Arguments::Mode Arguments::_mode = _mixed;
97 const char* Arguments::_java_vendor_url_bug = nullptr;
98 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
99 bool Arguments::_executing_unit_tests = false;
100
101 // These parameters are reset in method parse_vm_init_args()
102 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
103 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
104 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
105 bool Arguments::_ClipInlining = ClipInlining;
106 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
107
108 bool Arguments::_enable_preview = false;
109 bool Arguments::_has_jdwp_agent = false;
110
111 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
112
113 // These are not set by the JDK's built-in launchers, but they can be set by
114 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
115 // JavaVMOption in jni.h.
116 abort_hook_t Arguments::_abort_hook = nullptr;
117 exit_hook_t Arguments::_exit_hook = nullptr;
118 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
119
120
121 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
122 SystemProperty *Arguments::_java_library_path = nullptr;
123 SystemProperty *Arguments::_java_home = nullptr;
124 SystemProperty *Arguments::_java_class_path = nullptr;
125 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
126 SystemProperty *Arguments::_vm_info = nullptr;
127
128 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
129 PathString *Arguments::_boot_class_path = nullptr;
130 bool Arguments::_has_jimage = false;
131
132 char* Arguments::_ext_dirs = nullptr;
133
134 // True if -Xshare:auto option was specified.
135 static bool xshare_auto_cmd_line = false;
136
137 // True if -Xint/-Xmixed/-Xcomp were specified
138 static bool mode_flag_cmd_line = false;
139
140 struct VMInitArgsGroup {
141 const JavaVMInitArgs* _args;
142 JVMFlagOrigin _origin;
143 };
144
145 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
146 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
147 if (new_value == nullptr) {
148 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
149 return false;
150 }
151 if (_value != nullptr) {
152 FreeHeap(_value);
153 }
154 _value = new_value;
155 strcpy(_value, value);
156 return true;
157 }
158
159 void PathString::append_value(const char *value) {
160 char *sp;
161 size_t len = 0;
162 if (value != nullptr) {
163 len = strlen(value);
164 if (_value != nullptr) {
165 len += strlen(_value);
166 }
167 sp = AllocateHeap(len+2, mtArguments);
168 assert(sp != nullptr, "Unable to allocate space for new append path value");
169 if (sp != nullptr) {
170 if (_value != nullptr) {
171 strcpy(sp, _value);
172 strcat(sp, os::path_separator());
173 strcat(sp, value);
174 FreeHeap(_value);
175 } else {
176 strcpy(sp, value);
177 }
178 _value = sp;
179 }
180 }
181 }
182
183 PathString::PathString(const char* value) {
184 if (value == nullptr) {
185 _value = nullptr;
186 } else {
187 _value = AllocateHeap(strlen(value)+1, mtArguments);
188 strcpy(_value, value);
189 }
190 }
191
192 PathString::~PathString() {
193 if (_value != nullptr) {
194 FreeHeap(_value);
195 _value = nullptr;
196 }
197 }
198
199 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
200 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
201 size_t len = strlen(module_name) + 1;
202 _module_name = AllocateHeap(len, mtInternal);
203 strncpy(_module_name, module_name, len); // copy the trailing null
204 _path = new PathString(path);
205 }
206
207 ModulePatchPath::~ModulePatchPath() {
208 if (_module_name != nullptr) {
209 FreeHeap(_module_name);
210 _module_name = nullptr;
211 }
212 if (_path != nullptr) {
213 delete _path;
214 _path = nullptr;
215 }
216 }
217
218 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
219 if (key == nullptr) {
220 _key = nullptr;
221 } else {
222 _key = AllocateHeap(strlen(key)+1, mtArguments);
223 strcpy(_key, key);
224 }
225 _next = nullptr;
226 _internal = internal;
227 _writeable = writeable;
228 }
229
230 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
231 // part of the option string.
232 static bool match_option(const JavaVMOption *option, const char* name,
233 const char** tail) {
234 size_t len = strlen(name);
235 if (strncmp(option->optionString, name, len) == 0) {
236 *tail = option->optionString + len;
237 return true;
238 } else {
239 return false;
240 }
241 }
242
243 // Check if 'option' matches 'name'. No "tail" is allowed.
244 static bool match_option(const JavaVMOption *option, const char* name) {
245 const char* tail = nullptr;
246 bool result = match_option(option, name, &tail);
247 if (tail != nullptr && *tail == '\0') {
248 return result;
249 } else {
250 return false;
251 }
252 }
253
254 // Return true if any of the strings in null-terminated array 'names' matches.
255 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
256 // the option must match exactly.
257 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
258 bool tail_allowed) {
259 for (/* empty */; *names != nullptr; ++names) {
260 if (match_option(option, *names, tail)) {
261 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
262 return true;
263 }
264 }
265 }
266 return false;
267 }
268
269 #if INCLUDE_JFR
270 static bool _has_jfr_option = false; // is using JFR
271
272 // return true on failure
273 static bool match_jfr_option(const JavaVMOption** option) {
274 assert((*option)->optionString != nullptr, "invariant");
275 char* tail = nullptr;
276 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
277 _has_jfr_option = true;
278 return Jfr::on_start_flight_recording_option(option, tail);
279 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
280 _has_jfr_option = true;
281 return Jfr::on_flight_recorder_option(option, tail);
282 }
283 return false;
284 }
285
286 bool Arguments::has_jfr_option() {
287 return _has_jfr_option;
288 }
289 #endif
290
291 static void logOption(const char* opt) {
292 if (PrintVMOptions) {
293 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
294 }
295 }
296
297 bool needs_module_property_warning = false;
298
299 #define MODULE_PROPERTY_PREFIX "jdk.module."
300 #define MODULE_PROPERTY_PREFIX_LEN 11
301 #define ADDEXPORTS "addexports"
302 #define ADDEXPORTS_LEN 10
303 #define ADDREADS "addreads"
304 #define ADDREADS_LEN 8
305 #define ADDOPENS "addopens"
306 #define ADDOPENS_LEN 8
307 #define PATCH "patch"
308 #define PATCH_LEN 5
309 #define ADDMODS "addmods"
310 #define ADDMODS_LEN 7
311 #define LIMITMODS "limitmods"
312 #define LIMITMODS_LEN 9
313 #define PATH "path"
314 #define PATH_LEN 4
315 #define UPGRADE_PATH "upgrade.path"
316 #define UPGRADE_PATH_LEN 12
317 #define ENABLE_NATIVE_ACCESS "enable.native.access"
318 #define ENABLE_NATIVE_ACCESS_LEN 20
319 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
320 #define ILLEGAL_NATIVE_ACCESS_LEN 21
321
322 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
323 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
324 return ((strncmp(option, property, len) == 0) &&
325 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
326 }
327
328 // Return true if property starts with "jdk.module." and its ensuing chars match
329 // any of the reserved module properties.
330 // property should be passed without the leading "-D".
331 bool Arguments::is_internal_module_property(const char* property) {
332 return internal_module_property_helper(property, false);
333 }
334
335 // Returns true if property is one of those recognized by is_internal_module_property() but
336 // is not supported by CDS archived full module graph.
337 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
338 return internal_module_property_helper(property, true);
339 }
340
341 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
342 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
343 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
344 if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
345 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
346 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
347 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN)) {
348 return true;
349 }
350
351 if (!check_for_cds) {
352 // CDS notes: these properties are supported by CDS archived full module graph.
353 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
354 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
355 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
356 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
357 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
358 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
359 return true;
360 }
361 }
362 }
363 return false;
364 }
365
366 bool Arguments::patching_migrated_classes(const char* property, const char* value) {
367 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
368 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
369 if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN)) {
370 if (strcmp(value, "java.base-valueclasses.jar")) {
371 return true;
372 }
373 }
374 }
375 return false;
376 }
377
378 // Process java launcher properties.
379 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
380 // See if sun.java.launcher is defined.
381 // Must do this before setting up other system properties,
382 // as some of them may depend on launcher type.
383 for (int index = 0; index < args->nOptions; index++) {
384 const JavaVMOption* option = args->options + index;
385 const char* tail;
386
387 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
388 process_java_launcher_argument(tail, option->extraInfo);
389 continue;
390 }
391 if (match_option(option, "-XX:+ExecutingUnitTests")) {
392 _executing_unit_tests = true;
393 continue;
394 }
395 }
396 }
397
398 // Initialize system properties key and value.
399 void Arguments::init_system_properties() {
400
401 // Set up _boot_class_path which is not a property but
402 // relies heavily on argument processing and the jdk.boot.class.path.append
403 // property. It is used to store the underlying boot class path.
404 _boot_class_path = new PathString(nullptr);
405
406 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
407 "Java Virtual Machine Specification", false));
408 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
409 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
410 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
411
412 // Initialize the vm.info now, but it will need updating after argument parsing.
413 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
414
415 // Following are JVMTI agent writable properties.
416 // Properties values are set to nullptr and they are
417 // os specific they are initialized in os::init_system_properties_values().
418 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
419 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
420 _java_home = new SystemProperty("java.home", nullptr, true);
421 _java_class_path = new SystemProperty("java.class.path", "", true);
422 // jdk.boot.class.path.append is a non-writeable, internal property.
423 // It can only be set by either:
424 // - -Xbootclasspath/a:
425 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
426 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
427
428 // Add to System Property list.
429 PropertyList_add(&_system_properties, _sun_boot_library_path);
430 PropertyList_add(&_system_properties, _java_library_path);
431 PropertyList_add(&_system_properties, _java_home);
432 PropertyList_add(&_system_properties, _java_class_path);
433 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
434 PropertyList_add(&_system_properties, _vm_info);
435
436 // Set OS specific system properties values
437 os::init_system_properties_values();
438 }
439
440 // Update/Initialize System properties after JDK version number is known
441 void Arguments::init_version_specific_system_properties() {
442 enum { bufsz = 16 };
443 char buffer[bufsz];
444 const char* spec_vendor = "Oracle Corporation";
445 uint32_t spec_version = JDK_Version::current().major_version();
446
447 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
448
449 PropertyList_add(&_system_properties,
450 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
451 PropertyList_add(&_system_properties,
452 new SystemProperty("java.vm.specification.version", buffer, false));
453 PropertyList_add(&_system_properties,
454 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
455 }
456
457 /*
458 * -XX argument processing:
459 *
460 * -XX arguments are defined in several places, such as:
461 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
462 * -XX arguments are parsed in parse_argument().
463 * -XX argument bounds checking is done in check_vm_args_consistency().
464 *
465 * Over time -XX arguments may change. There are mechanisms to handle common cases:
466 *
467 * ALIASED: An option that is simply another name for another option. This is often
468 * part of the process of deprecating a flag, but not all aliases need
469 * to be deprecated.
470 *
471 * Create an alias for an option by adding the old and new option names to the
472 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
473 *
474 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
475 * support may be removed in the future. Both regular and aliased options may be
476 * deprecated.
477 *
478 * Add a deprecation warning for an option (or alias) by adding an entry in the
479 * "special_jvm_flags" table and setting the "deprecated_in" field.
480 * Often an option "deprecated" in one major release will
481 * be made "obsolete" in the next. In this case the entry should also have its
482 * "obsolete_in" field set.
483 *
484 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
485 * on the command line. A warning is printed to let the user know that option might not
486 * be accepted in the future.
487 *
488 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
489 * table and setting the "obsolete_in" field.
490 *
491 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
492 * to the current JDK version. The system will flatly refuse to admit the existence of
493 * the flag. This allows a flag to die automatically over JDK releases.
494 *
495 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
496 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
497 * - Newly obsolete or expired deprecated options should have their global variable
498 * definitions removed (from globals.hpp, etc) and related implementations removed.
499 *
500 * Recommended approach for removing options:
501 *
502 * To remove options commonly used by customers (e.g. product -XX options), use
503 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
504 *
505 * To remove internal options (e.g. diagnostic, experimental, develop options), use
506 * a 2-step model adding major release numbers to the obsolete and expire columns.
507 *
508 * To change the name of an option, use the alias table as well as a 2-step
509 * model adding major release numbers to the deprecate and expire columns.
510 * Think twice about aliasing commonly used customer options.
511 *
512 * There are times when it is appropriate to leave a future release number as undefined.
513 *
514 * Tests: Aliases should be tested in VMAliasOptions.java.
515 * Deprecated options should be tested in VMDeprecatedOptions.java.
516 */
517
518 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
519 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
520 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
521 // the command-line as usual, but will issue a warning.
522 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
523 // the command-line, while issuing a warning and ignoring the flag value.
524 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
525 // existence of the flag.
526 //
527 // MANUAL CLEANUP ON JDK VERSION UPDATES:
528 // This table ensures that the handling of options will update automatically when the JDK
529 // version is incremented, but the source code needs to be cleanup up manually:
530 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
531 // variable should be removed, as well as users of the variable.
532 // - As "deprecated" options age into "obsolete" options, move the entry into the
533 // "Obsolete Flags" section of the table.
534 // - All expired options should be removed from the table.
535 static SpecialFlag const special_jvm_flags[] = {
536 // -------------- Deprecated Flags --------------
537 // --- Non-alias flags - sorted by obsolete_in then expired_in:
538 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
539 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
540 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
541 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
542 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
543 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
544 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
545 #ifdef _LP64
546 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::undefined() },
547 #endif
548 { "ParallelRefProcEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
549 { "ParallelRefProcBalancingEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
550 { "PSChunkLargeArrays", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
551 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
552 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
553
554 // -------------- Obsolete Flags - sorted by expired_in --------------
555
556 #ifdef LINUX
557 { "UseOprofile", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) },
558 #endif
559 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
560 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::undefined() },
561 { "ZMarkStackSpaceLimit", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
562 #if defined(AARCH64)
563 { "NearCpool", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
564 #endif
565
566 #ifdef ASSERT
567 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
568 #endif
569
570 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
571 // These entries will generate build errors. Their purpose is to test the macros.
572 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
573 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
574 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
575 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
576 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
577 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
578 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
579 #endif
580
581 { nullptr, JDK_Version(0), JDK_Version(0) }
582 };
583
584 // Flags that are aliases for other flags.
585 typedef struct {
586 const char* alias_name;
587 const char* real_name;
588 } AliasedFlag;
589
590 static AliasedFlag const aliased_jvm_flags[] = {
591 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
592 { nullptr, nullptr}
593 };
594
595 // Return true if "v" is less than "other", where "other" may be "undefined".
596 static bool version_less_than(JDK_Version v, JDK_Version other) {
597 assert(!v.is_undefined(), "must be defined");
598 if (!other.is_undefined() && v.compare(other) >= 0) {
599 return false;
600 } else {
601 return true;
602 }
603 }
604
605 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
606 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
607 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
608 flag = special_jvm_flags[i];
609 return true;
610 }
611 }
612 return false;
613 }
614
615 bool Arguments::is_obsolete_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.obsolete_in.is_undefined()) {
620 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
621 *version = flag.obsolete_in;
622 // This flag may have been marked for obsoletion in this version, but we may not
623 // have actually removed it yet. Rather than ignoring it as soon as we reach
624 // this version we allow some time for the removal to happen. So if the flag
625 // still actually exists we process it as normal, but issue an adjusted warning.
626 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
627 if (real_flag != nullptr) {
628 char version_str[256];
629 version->to_string(version_str, sizeof(version_str));
630 warning("Temporarily processing option %s; support is scheduled for removal in %s",
631 flag_name, version_str);
632 return false;
633 }
634 return true;
635 }
636 }
637 }
638 return false;
639 }
640
641 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
642 assert(version != nullptr, "Must provide a version buffer");
643 SpecialFlag flag;
644 if (lookup_special_flag(flag_name, flag)) {
645 if (!flag.deprecated_in.is_undefined()) {
646 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
647 version_less_than(JDK_Version::current(), flag.expired_in)) {
648 *version = flag.deprecated_in;
649 return 1;
650 } else {
651 return -1;
652 }
653 }
654 }
655 return 0;
656 }
657
658 const char* Arguments::real_flag_name(const char *flag_name) {
659 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
660 const AliasedFlag& flag_status = aliased_jvm_flags[i];
661 if (strcmp(flag_status.alias_name, flag_name) == 0) {
662 return flag_status.real_name;
663 }
664 }
665 return flag_name;
666 }
667
668 #ifdef ASSERT
669 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
670 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
671 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
672 return true;
673 }
674 }
675 return false;
676 }
677
678 // Verifies the correctness of the entries in the special_jvm_flags table.
679 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
680 // version being earlier than the deprecation version, then a warning is issued
681 // and verification fails - by returning false. If it is detected that the table
682 // is out of date, with respect to the current version, then ideally a warning is
683 // issued but verification does not fail. This allows the VM to operate when the
684 // version is first updated, without needing to update all the impacted flags at
685 // the same time. In practice we can't issue the warning immediately when the version
686 // is updated as it occurs for every test and some tests are not prepared to handle
687 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
688 // if the check_globals flag is true, and in addition allow a grace period and only
689 // check for stale flags when we hit build 25 (which is far enough into the 6 month
690 // release cycle that all flag updates should have been processed, whilst still
691 // leaving time to make the change before RDP2).
692 // We use a gtest to call this, passing true, so that we can detect stale flags before
693 // the end of the release cycle.
694
695 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
696
697 bool Arguments::verify_special_jvm_flags(bool check_globals) {
698 bool success = true;
699 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
700 const SpecialFlag& flag = special_jvm_flags[i];
701 if (lookup_special_flag(flag.name, i)) {
702 warning("Duplicate special flag declaration \"%s\"", flag.name);
703 success = false;
704 }
705 if (flag.deprecated_in.is_undefined() &&
706 flag.obsolete_in.is_undefined()) {
707 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
708 success = false;
709 }
710
711 if (!flag.deprecated_in.is_undefined()) {
712 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
713 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
714 success = false;
715 }
716
717 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
718 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
719 success = false;
720 }
721 }
722
723 if (!flag.obsolete_in.is_undefined()) {
724 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
725 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
726 success = false;
727 }
728
729 // if flag has become obsolete it should not have a "globals" flag defined anymore.
730 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
731 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
732 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
733 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
734 success = false;
735 }
736 }
737
738 } else if (!flag.expired_in.is_undefined()) {
739 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
740 success = false;
741 }
742
743 if (!flag.expired_in.is_undefined()) {
744 // if flag has become expired it should not have a "globals" flag defined anymore.
745 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
746 !version_less_than(JDK_Version::current(), flag.expired_in)) {
747 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
748 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
749 success = false;
750 }
751 }
752 }
753 }
754 return success;
755 }
756 #endif
757
758 bool Arguments::atojulong(const char *s, julong* result) {
759 return parse_integer(s, result);
760 }
761
762 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
763 if (size < min_size) return arg_too_small;
764 if (size > max_size) return arg_too_big;
765 return arg_in_range;
766 }
767
768 // Describe an argument out of range error
769 void Arguments::describe_range_error(ArgsRange errcode) {
770 switch(errcode) {
771 case arg_too_big:
772 jio_fprintf(defaultStream::error_stream(),
773 "The specified size exceeds the maximum "
774 "representable size.\n");
775 break;
776 case arg_too_small:
777 case arg_unreadable:
778 case arg_in_range:
779 // do nothing for now
780 break;
781 default:
782 ShouldNotReachHere();
783 }
784 }
785
786 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
787 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
788 return true;
789 } else {
790 return false;
791 }
792 }
793
794 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
795 // strtod allows leading whitespace, but our flag format does not.
796 if (*value == '\0' || isspace((unsigned char) *value)) {
797 return false;
798 }
799 char* end;
800 errno = 0;
801 double v = strtod(value, &end);
802 if ((errno != 0) || (*end != 0)) {
803 return false;
804 }
805 if (g_isnan(v) || !g_isfinite(v)) {
806 // Currently we cannot handle these special values.
807 return false;
808 }
809
810 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
811 return true;
812 }
813 return false;
814 }
815
816 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
817 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
818
819 if (flag->is_int()) {
820 int v;
821 if (parse_integer(value, &v)) {
822 result = JVMFlagAccess::set_int(flag, &v, origin);
823 }
824 } else if (flag->is_uint()) {
825 uint v;
826 if (parse_integer(value, &v)) {
827 result = JVMFlagAccess::set_uint(flag, &v, origin);
828 }
829 } else if (flag->is_intx()) {
830 intx v;
831 if (parse_integer(value, &v)) {
832 result = JVMFlagAccess::set_intx(flag, &v, origin);
833 }
834 } else if (flag->is_uintx()) {
835 uintx v;
836 if (parse_integer(value, &v)) {
837 result = JVMFlagAccess::set_uintx(flag, &v, origin);
838 }
839 } else if (flag->is_uint64_t()) {
840 uint64_t v;
841 if (parse_integer(value, &v)) {
842 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
843 }
844 } else if (flag->is_size_t()) {
845 size_t v;
846 if (parse_integer(value, &v)) {
847 result = JVMFlagAccess::set_size_t(flag, &v, origin);
848 }
849 }
850
851 return result == JVMFlag::SUCCESS;
852 }
853
854 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
855 if (value[0] == '\0') {
856 value = nullptr;
857 }
858 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
859 // Contract: JVMFlag always returns a pointer that needs freeing.
860 FREE_C_HEAP_ARRAY(char, value);
861 return true;
862 }
863
864 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
865 const char* old_value = "";
866 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
867 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
868 size_t new_len = strlen(new_value);
869 const char* value;
870 char* free_this_too = nullptr;
871 if (old_len == 0) {
872 value = new_value;
873 } else if (new_len == 0) {
874 value = old_value;
875 } else {
876 size_t length = old_len + 1 + new_len + 1;
877 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
878 // each new setting adds another LINE to the switch:
879 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
880 value = buf;
881 free_this_too = buf;
882 }
883 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
884 // JVMFlag always returns a pointer that needs freeing.
885 FREE_C_HEAP_ARRAY(char, value);
886 // JVMFlag made its own copy, so I must delete my own temp. buffer.
887 FREE_C_HEAP_ARRAY(char, free_this_too);
888 return true;
889 }
890
891 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
892 const char* real_name = real_flag_name(arg);
893 JDK_Version since = JDK_Version();
894 switch (is_deprecated_flag(arg, &since)) {
895 case -1: {
896 // Obsolete or expired, so don't process normally,
897 // but allow for an obsolete flag we're still
898 // temporarily allowing.
899 if (!is_obsolete_flag(arg, &since)) {
900 return real_name;
901 }
902 // Note if we're not considered obsolete then we can't be expired either
903 // as obsoletion must come first.
904 return nullptr;
905 }
906 case 0:
907 return real_name;
908 case 1: {
909 char version[256];
910 since.to_string(version, sizeof(version));
911 if (real_name != arg) {
912 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
913 arg, version, real_name);
914 } else {
915 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
916 arg, version);
917 }
918 return real_name;
919 }
920 }
921 ShouldNotReachHere();
922 return nullptr;
923 }
924
925 #define BUFLEN 255
926
927 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
928 char name_copied[BUFLEN+1];
929 if (name[name_length] != 0) {
930 if (name_length > BUFLEN) {
931 return nullptr;
932 } else {
933 strncpy(name_copied, name, name_length);
934 name_copied[name_length] = '\0';
935 name = name_copied;
936 }
937 }
938
939 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
940 if (real_name == nullptr) {
941 return nullptr;
942 }
943 JVMFlag* flag = JVMFlag::find_flag(real_name);
944 return flag;
945 }
946
947 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
948 bool is_bool = false;
949 bool bool_val = false;
950 char c = *arg;
951 if (c == '+' || c == '-') {
952 is_bool = true;
953 bool_val = (c == '+');
954 arg++;
955 }
956
957 const char* name = arg;
958 while (true) {
959 c = *arg;
960 if (isalnum(c) || (c == '_')) {
961 ++arg;
962 } else {
963 break;
964 }
965 }
966
967 size_t name_len = size_t(arg - name);
968 if (name_len == 0) {
969 return false;
970 }
971
972 JVMFlag* flag = find_jvm_flag(name, name_len);
973 if (flag == nullptr) {
974 return false;
975 }
976
977 if (is_bool) {
978 if (*arg != 0) {
979 // Error -- extra characters such as -XX:+BoolFlag=123
980 return false;
981 }
982 return set_bool_flag(flag, bool_val, origin);
983 }
984
985 if (arg[0] == '=') {
986 const char* value = arg + 1;
987 if (flag->is_ccstr()) {
988 if (flag->ccstr_accumulates()) {
989 return append_to_string_flag(flag, value, origin);
990 } else {
991 return set_string_flag(flag, value, origin);
992 }
993 } else if (flag->is_double()) {
994 return set_fp_numeric_flag(flag, value, origin);
995 } else {
996 return set_numeric_flag(flag, value, origin);
997 }
998 }
999
1000 if (arg[0] == ':' && arg[1] == '=') {
1001 // -XX:Foo:=xxx will reset the string flag to the given value.
1002 const char* value = arg + 2;
1003 return set_string_flag(flag, value, origin);
1004 }
1005
1006 return false;
1007 }
1008
1009 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1010 assert(bldarray != nullptr, "illegal argument");
1011
1012 if (arg == nullptr) {
1013 return;
1014 }
1015
1016 int new_count = *count + 1;
1017
1018 // expand the array and add arg to the last element
1019 if (*bldarray == nullptr) {
1020 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1021 } else {
1022 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1023 }
1024 (*bldarray)[*count] = os::strdup_check_oom(arg);
1025 *count = new_count;
1026 }
1027
1028 void Arguments::build_jvm_args(const char* arg) {
1029 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1030 }
1031
1032 void Arguments::build_jvm_flags(const char* arg) {
1033 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1034 }
1035
1036 // utility function to return a string that concatenates all
1037 // strings in a given char** array
1038 const char* Arguments::build_resource_string(char** args, int count) {
1039 if (args == nullptr || count == 0) {
1040 return nullptr;
1041 }
1042 size_t length = 0;
1043 for (int i = 0; i < count; i++) {
1044 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1045 }
1046 char* s = NEW_RESOURCE_ARRAY(char, length);
1047 char* dst = s;
1048 for (int j = 0; j < count; j++) {
1049 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1050 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1051 dst += offset;
1052 length -= offset;
1053 }
1054 return (const char*) s;
1055 }
1056
1057 void Arguments::print_on(outputStream* st) {
1058 st->print_cr("VM Arguments:");
1059 if (num_jvm_flags() > 0) {
1060 st->print("jvm_flags: "); print_jvm_flags_on(st);
1061 st->cr();
1062 }
1063 if (num_jvm_args() > 0) {
1064 st->print("jvm_args: "); print_jvm_args_on(st);
1065 st->cr();
1066 }
1067 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1068 if (_java_class_path != nullptr) {
1069 char* path = _java_class_path->value();
1070 size_t len = strlen(path);
1071 st->print("java_class_path (initial): ");
1072 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1073 if (len == 0) {
1074 st->print_raw_cr("<not set>");
1075 } else {
1076 st->print_raw_cr(path, len);
1077 }
1078 }
1079 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1080 }
1081
1082 void Arguments::print_summary_on(outputStream* st) {
1083 // Print the command line. Environment variables that are helpful for
1084 // reproducing the problem are written later in the hs_err file.
1085 // flags are from setting file
1086 if (num_jvm_flags() > 0) {
1087 st->print_raw("Settings File: ");
1088 print_jvm_flags_on(st);
1089 st->cr();
1090 }
1091 // args are the command line and environment variable arguments.
1092 st->print_raw("Command Line: ");
1093 if (num_jvm_args() > 0) {
1094 print_jvm_args_on(st);
1095 }
1096 // this is the classfile and any arguments to the java program
1097 if (java_command() != nullptr) {
1098 st->print("%s", java_command());
1099 }
1100 st->cr();
1101 }
1102
1103 void Arguments::print_jvm_flags_on(outputStream* st) {
1104 if (_num_jvm_flags > 0) {
1105 for (int i=0; i < _num_jvm_flags; i++) {
1106 st->print("%s ", _jvm_flags_array[i]);
1107 }
1108 }
1109 }
1110
1111 void Arguments::print_jvm_args_on(outputStream* st) {
1112 if (_num_jvm_args > 0) {
1113 for (int i=0; i < _num_jvm_args; i++) {
1114 st->print("%s ", _jvm_args_array[i]);
1115 }
1116 }
1117 }
1118
1119 bool Arguments::process_argument(const char* arg,
1120 jboolean ignore_unrecognized,
1121 JVMFlagOrigin origin) {
1122 JDK_Version since = JDK_Version();
1123
1124 if (parse_argument(arg, origin)) {
1125 return true;
1126 }
1127
1128 // Determine if the flag has '+', '-', or '=' characters.
1129 bool has_plus_minus = (*arg == '+' || *arg == '-');
1130 const char* const argname = has_plus_minus ? arg + 1 : arg;
1131
1132 size_t arg_len;
1133 const char* equal_sign = strchr(argname, '=');
1134 if (equal_sign == nullptr) {
1135 arg_len = strlen(argname);
1136 } else {
1137 arg_len = equal_sign - argname;
1138 }
1139
1140 // Only make the obsolete check for valid arguments.
1141 if (arg_len <= BUFLEN) {
1142 // Construct a string which consists only of the argument name without '+', '-', or '='.
1143 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1144 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1145 if (is_obsolete_flag(stripped_argname, &since)) {
1146 char version[256];
1147 since.to_string(version, sizeof(version));
1148 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1149 return true;
1150 }
1151 }
1152
1153 // For locked flags, report a custom error message if available.
1154 // Otherwise, report the standard unrecognized VM option.
1155 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1156 if (found_flag != nullptr) {
1157 char locked_message_buf[BUFLEN];
1158 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1159 if (strlen(locked_message_buf) != 0) {
1160 #ifdef PRODUCT
1161 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1162 if (ignore_unrecognized && mismatched) {
1163 return true;
1164 }
1165 #endif
1166 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1167 }
1168 if (found_flag->is_bool() && !has_plus_minus) {
1169 jio_fprintf(defaultStream::error_stream(),
1170 "Missing +/- setting for VM option '%s'\n", argname);
1171 } else if (!found_flag->is_bool() && has_plus_minus) {
1172 jio_fprintf(defaultStream::error_stream(),
1173 "Unexpected +/- setting in VM option '%s'\n", argname);
1174 } else {
1175 jio_fprintf(defaultStream::error_stream(),
1176 "Improperly specified VM option '%s'\n", argname);
1177 }
1178 } else {
1179 if (ignore_unrecognized) {
1180 return true;
1181 }
1182 jio_fprintf(defaultStream::error_stream(),
1183 "Unrecognized VM option '%s'\n", argname);
1184 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1185 if (fuzzy_matched != nullptr) {
1186 jio_fprintf(defaultStream::error_stream(),
1187 "Did you mean '%s%s%s'?\n",
1188 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1189 fuzzy_matched->name(),
1190 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1191 }
1192 }
1193
1194 // allow for commandline "commenting out" options like -XX:#+Verbose
1195 return arg[0] == '#';
1196 }
1197
1198 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1199 FILE* stream = os::fopen(file_name, "rb");
1200 if (stream == nullptr) {
1201 if (should_exist) {
1202 jio_fprintf(defaultStream::error_stream(),
1203 "Could not open settings file %s\n", file_name);
1204 return false;
1205 } else {
1206 return true;
1207 }
1208 }
1209
1210 char token[1024];
1211 int pos = 0;
1212
1213 bool in_white_space = true;
1214 bool in_comment = false;
1215 bool in_quote = false;
1216 int quote_c = 0;
1217 bool result = true;
1218
1219 int c = getc(stream);
1220 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1221 if (in_white_space) {
1222 if (in_comment) {
1223 if (c == '\n') in_comment = false;
1224 } else {
1225 if (c == '#') in_comment = true;
1226 else if (!isspace((unsigned char) c)) {
1227 in_white_space = false;
1228 token[pos++] = checked_cast<char>(c);
1229 }
1230 }
1231 } else {
1232 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1233 // token ends at newline, or at unquoted whitespace
1234 // this allows a way to include spaces in string-valued options
1235 token[pos] = '\0';
1236 logOption(token);
1237 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1238 build_jvm_flags(token);
1239 pos = 0;
1240 in_white_space = true;
1241 in_quote = false;
1242 } else if (!in_quote && (c == '\'' || c == '"')) {
1243 in_quote = true;
1244 quote_c = c;
1245 } else if (in_quote && (c == quote_c)) {
1246 in_quote = false;
1247 } else {
1248 token[pos++] = checked_cast<char>(c);
1249 }
1250 }
1251 c = getc(stream);
1252 }
1253 if (pos > 0) {
1254 token[pos] = '\0';
1255 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1256 build_jvm_flags(token);
1257 }
1258 fclose(stream);
1259 return result;
1260 }
1261
1262 //=============================================================================================================
1263 // Parsing of properties (-D)
1264
1265 const char* Arguments::get_property(const char* key) {
1266 return PropertyList_get_value(system_properties(), key);
1267 }
1268
1269 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1270 const char* eq = strchr(prop, '=');
1271 const char* key;
1272 const char* value = "";
1273
1274 if (eq == nullptr) {
1275 // property doesn't have a value, thus use passed string
1276 key = prop;
1277 } else {
1278 // property have a value, thus extract it and save to the
1279 // allocated string
1280 size_t key_len = eq - prop;
1281 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1282
1283 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1284 key = tmp_key;
1285
1286 value = &prop[key_len + 1];
1287 }
1288
1289 if (internal == ExternalProperty) {
1290 CDSConfig::check_incompatible_property(key, value);
1291 }
1292
1293 if (strcmp(key, "java.compiler") == 0) {
1294 // we no longer support java.compiler system property, log a warning and let it get
1295 // passed to Java, like any other system property
1296 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1297 // for applications using NONE or empty value, log a more informative message
1298 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1299 } else {
1300 warning("The java.compiler system property is obsolete and no longer supported.");
1301 }
1302 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1303 // append is true, writable is true, internal is false
1304 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1305 WriteableProperty, ExternalProperty);
1306 } else {
1307 if (strcmp(key, "sun.java.command") == 0) {
1308 char *old_java_command = _java_command;
1309 _java_command = os::strdup_check_oom(value, mtArguments);
1310 if (old_java_command != nullptr) {
1311 os::free(old_java_command);
1312 }
1313 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1314 // If this property is set on the command line then its value will be
1315 // displayed in VM error logs as the URL at which to submit such logs.
1316 // Normally the URL displayed in error logs is different from the value
1317 // of this system property, so a different property should have been
1318 // used here, but we leave this as-is in case someone depends upon it.
1319 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1320 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1321 // its value without going through the property list or making a Java call.
1322 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1323 if (old_java_vendor_url_bug != nullptr) {
1324 os::free((void *)old_java_vendor_url_bug);
1325 }
1326 }
1327
1328 // Create new property and add at the end of the list
1329 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1330 }
1331
1332 if (key != prop) {
1333 // SystemProperty copy passed value, thus free previously allocated
1334 // memory
1335 FreeHeap((void *)key);
1336 }
1337
1338 return true;
1339 }
1340
1341 //===========================================================================================================
1342 // Setting int/mixed/comp mode flags
1343
1344 void Arguments::set_mode_flags(Mode mode) {
1345 // Set up default values for all flags.
1346 // If you add a flag to any of the branches below,
1347 // add a default value for it here.
1348 _mode = mode;
1349
1350 // Ensure Agent_OnLoad has the correct initial values.
1351 // This may not be the final mode; mode may change later in onload phase.
1352 PropertyList_unique_add(&_system_properties, "java.vm.info",
1353 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1354
1355 UseInterpreter = true;
1356 UseCompiler = true;
1357 UseLoopCounter = true;
1358
1359 // Default values may be platform/compiler dependent -
1360 // use the saved values
1361 ClipInlining = Arguments::_ClipInlining;
1362 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1363 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1364 BackgroundCompilation = Arguments::_BackgroundCompilation;
1365
1366 // Change from defaults based on mode
1367 switch (mode) {
1368 default:
1369 ShouldNotReachHere();
1370 break;
1371 case _int:
1372 UseCompiler = false;
1373 UseLoopCounter = false;
1374 AlwaysCompileLoopMethods = false;
1375 UseOnStackReplacement = false;
1376 break;
1377 case _mixed:
1378 // same as default
1379 break;
1380 case _comp:
1381 UseInterpreter = false;
1382 BackgroundCompilation = false;
1383 ClipInlining = false;
1384 break;
1385 }
1386 }
1387
1388 // Conflict: required to use shared spaces (-Xshare:on), but
1389 // incompatible command line options were chosen.
1390 void Arguments::no_shared_spaces(const char* message) {
1391 if (RequireSharedSpaces) {
1392 aot_log_error(aot)("%s is incompatible with other specified options.",
1393 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1394 if (CDSConfig::new_aot_flags_used()) {
1395 vm_exit_during_initialization("Unable to use AOT cache", message);
1396 } else {
1397 vm_exit_during_initialization("Unable to use shared archive", message);
1398 }
1399 } else {
1400 if (CDSConfig::new_aot_flags_used()) {
1401 log_warning(aot)("Unable to use AOT cache: %s", message);
1402 } else {
1403 aot_log_info(aot)("Unable to use shared archive: %s", message);
1404 }
1405 UseSharedSpaces = false;
1406 }
1407 }
1408
1409 static void set_object_alignment() {
1410 // Object alignment.
1411 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1412 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1413 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1414 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1415 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1416 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1417
1418 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1419 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1420
1421 // Oop encoding heap max
1422 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1423 }
1424
1425 size_t Arguments::max_heap_for_compressed_oops() {
1426 // Avoid sign flip.
1427 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1428 // We need to fit both the null page and the heap into the memory budget, while
1429 // keeping alignment constraints of the heap. To guarantee the latter, as the
1430 // null page is located before the heap, we pad the null page to the conservative
1431 // maximum alignment that the GC may ever impose upon the heap.
1432 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1433 _conservative_max_heap_alignment);
1434
1435 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1436 NOT_LP64(ShouldNotReachHere(); return 0);
1437 }
1438
1439 void Arguments::set_use_compressed_oops() {
1440 #ifdef _LP64
1441 // MaxHeapSize is not set up properly at this point, but
1442 // the only value that can override MaxHeapSize if we are
1443 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1444 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1445
1446 if (max_heap_size <= max_heap_for_compressed_oops()) {
1447 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1448 FLAG_SET_ERGO(UseCompressedOops, true);
1449 }
1450 } else {
1451 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1452 warning("Max heap size too large for Compressed Oops");
1453 FLAG_SET_DEFAULT(UseCompressedOops, false);
1454 }
1455 }
1456 #endif // _LP64
1457 }
1458
1459 void Arguments::set_conservative_max_heap_alignment() {
1460 // The conservative maximum required alignment for the heap is the maximum of
1461 // the alignments imposed by several sources: any requirements from the heap
1462 // itself and the maximum page size we may run the VM with.
1463 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1464 _conservative_max_heap_alignment = MAX4(heap_alignment,
1465 os::vm_allocation_granularity(),
1466 os::max_page_size(),
1467 GCArguments::compute_heap_alignment());
1468 }
1469
1470 jint Arguments::set_ergonomics_flags() {
1471 GCConfig::initialize();
1472
1473 set_conservative_max_heap_alignment();
1474
1475 #ifdef _LP64
1476 set_use_compressed_oops();
1477
1478 // Also checks that certain machines are slower with compressed oops
1479 // in vm_version initialization code.
1480 #endif // _LP64
1481
1482 return JNI_OK;
1483 }
1484
1485 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1486 size_t max_allocatable;
1487 size_t result = limit;
1488 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1489 // The AggressiveHeap check is a temporary workaround to avoid calling
1490 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1491 // selected. This works because AggressiveHeap implies UseParallelGC
1492 // where we know the ratio will be 1. Once the AggressiveHeap option is
1493 // removed, this can be cleaned up.
1494 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1495 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1496 result = MIN2(result, max_allocatable / fraction);
1497 }
1498 return result;
1499 }
1500
1501 // Use static initialization to get the default before parsing
1502 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1503
1504 void Arguments::set_heap_size() {
1505 julong phys_mem;
1506
1507 // If the user specified one of these options, they
1508 // want specific memory sizing so do not limit memory
1509 // based on compressed oops addressability.
1510 // Also, memory limits will be calculated based on
1511 // available os physical memory, not our MaxRAM limit,
1512 // unless MaxRAM is also specified.
1513 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1514 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1515 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1516 !FLAG_IS_DEFAULT(MaxRAM));
1517 if (override_coop_limit) {
1518 if (FLAG_IS_DEFAULT(MaxRAM)) {
1519 phys_mem = os::physical_memory();
1520 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1521 } else {
1522 phys_mem = (julong)MaxRAM;
1523 }
1524 } else {
1525 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1526 : (julong)MaxRAM;
1527 }
1528
1529 // If the maximum heap size has not been set with -Xmx,
1530 // then set it as fraction of the size of physical memory,
1531 // respecting the maximum and minimum sizes of the heap.
1532 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1533 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1534 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1535 if (reasonable_min < MaxHeapSize) {
1536 // Small physical memory, so use a minimum fraction of it for the heap
1537 reasonable_max = reasonable_min;
1538 } else {
1539 // Not-small physical memory, so require a heap at least
1540 // as large as MaxHeapSize
1541 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1542 }
1543
1544 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1545 // Limit the heap size to ErgoHeapSizeLimit
1546 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1547 }
1548
1549 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1550
1551 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1552 // An initial heap size was specified on the command line,
1553 // so be sure that the maximum size is consistent. Done
1554 // after call to limit_heap_by_allocatable_memory because that
1555 // method might reduce the allocation size.
1556 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1557 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1558 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1559 }
1560
1561 #ifdef _LP64
1562 if (UseCompressedOops || UseCompressedClassPointers) {
1563 // HeapBaseMinAddress can be greater than default but not less than.
1564 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1565 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1566 // matches compressed oops printing flags
1567 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu"
1568 " (%zuG) which is greater than value given %zu",
1569 DefaultHeapBaseMinAddress,
1570 DefaultHeapBaseMinAddress/G,
1571 HeapBaseMinAddress);
1572 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1573 }
1574 }
1575 }
1576 if (UseCompressedOops) {
1577 // Limit the heap size to the maximum possible when using compressed oops
1578 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1579
1580 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1581 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1582 // but it should be not less than default MaxHeapSize.
1583 max_coop_heap -= HeapBaseMinAddress;
1584 }
1585
1586 // If user specified flags prioritizing os physical
1587 // memory limits, then disable compressed oops if
1588 // limits exceed max_coop_heap and UseCompressedOops
1589 // was not specified.
1590 if (reasonable_max > max_coop_heap) {
1591 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1592 aot_log_info(aot)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1593 " max heap %zu > compressed oop heap %zu. "
1594 "Please check the setting of MaxRAMPercentage %5.2f."
1595 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1596 FLAG_SET_ERGO(UseCompressedOops, false);
1597 } else {
1598 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1599 }
1600 }
1601 }
1602 #endif // _LP64
1603
1604 log_trace(gc, heap)(" Maximum heap size %zu", (size_t) reasonable_max);
1605 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1606 }
1607
1608 // If the minimum or initial heap_size have not been set or requested to be set
1609 // ergonomically, set them accordingly.
1610 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1611 julong reasonable_minimum = (julong)(OldSize + NewSize);
1612
1613 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1614
1615 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1616
1617 if (InitialHeapSize == 0) {
1618 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1619 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1620
1621 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1622 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1623
1624 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1625 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize);
1626 }
1627 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1628 // synchronize with InitialHeapSize to avoid errors with the default value.
1629 if (MinHeapSize == 0) {
1630 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1631 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize);
1632 }
1633 }
1634 }
1635
1636 // This option inspects the machine and attempts to set various
1637 // parameters to be optimal for long-running, memory allocation
1638 // intensive jobs. It is intended for machines with large
1639 // amounts of cpu and memory.
1640 jint Arguments::set_aggressive_heap_flags() {
1641 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1642 // VM, but we may not be able to represent the total physical memory
1643 // available (like having 8gb of memory on a box but using a 32bit VM).
1644 // Thus, we need to make sure we're using a julong for intermediate
1645 // calculations.
1646 julong initHeapSize;
1647 julong total_memory = os::physical_memory();
1648
1649 if (total_memory < (julong) 256 * M) {
1650 jio_fprintf(defaultStream::error_stream(),
1651 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1652 vm_exit(1);
1653 }
1654
1655 // The heap size is half of available memory, or (at most)
1656 // all of possible memory less 160mb (leaving room for the OS
1657 // when using ISM). This is the maximum; because adaptive sizing
1658 // is turned on below, the actual space used may be smaller.
1659
1660 initHeapSize = MIN2(total_memory / (julong) 2,
1661 total_memory - (julong) 160 * M);
1662
1663 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1664
1665 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1666 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1667 return JNI_EINVAL;
1668 }
1669 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1670 return JNI_EINVAL;
1671 }
1672 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1673 return JNI_EINVAL;
1674 }
1675 }
1676 if (FLAG_IS_DEFAULT(NewSize)) {
1677 // Make the young generation 3/8ths of the total heap.
1678 if (FLAG_SET_CMDLINE(NewSize,
1679 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1680 return JNI_EINVAL;
1681 }
1682 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1683 return JNI_EINVAL;
1684 }
1685 }
1686
1687 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1688 FLAG_SET_DEFAULT(UseLargePages, true);
1689 #endif
1690
1691 // Increase some data structure sizes for efficiency
1692 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1693 return JNI_EINVAL;
1694 }
1695 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1696 return JNI_EINVAL;
1697 }
1698
1699 // See the OldPLABSize comment below, but replace 'after promotion'
1700 // with 'after copying'. YoungPLABSize is the size of the survivor
1701 // space per-gc-thread buffers. The default is 4kw.
1702 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1703 return JNI_EINVAL;
1704 }
1705
1706 // OldPLABSize is the size of the buffers in the old gen that
1707 // UseParallelGC uses to promote live data that doesn't fit in the
1708 // survivor spaces. At any given time, there's one for each gc thread.
1709 // The default size is 1kw. These buffers are rarely used, since the
1710 // survivor spaces are usually big enough. For specjbb, however, there
1711 // are occasions when there's lots of live data in the young gen
1712 // and we end up promoting some of it. We don't have a definite
1713 // explanation for why bumping OldPLABSize helps, but the theory
1714 // is that a bigger PLAB results in retaining something like the
1715 // original allocation order after promotion, which improves mutator
1716 // locality. A minor effect may be that larger PLABs reduce the
1717 // number of PLAB allocation events during gc. The value of 8kw
1718 // was arrived at by experimenting with specjbb.
1719 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1720 return JNI_EINVAL;
1721 }
1722
1723 // Enable parallel GC and adaptive generation sizing
1724 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1725 return JNI_EINVAL;
1726 }
1727
1728 // Encourage steady state memory management
1729 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1730 return JNI_EINVAL;
1731 }
1732
1733 return JNI_OK;
1734 }
1735
1736 // This must be called after ergonomics.
1737 void Arguments::set_bytecode_flags() {
1738 if (!RewriteBytecodes) {
1739 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1740 }
1741 }
1742
1743 // Aggressive optimization flags
1744 jint Arguments::set_aggressive_opts_flags() {
1745 #ifdef COMPILER2
1746 if (AggressiveUnboxing) {
1747 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1748 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1749 } else if (!EliminateAutoBox) {
1750 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1751 AggressiveUnboxing = false;
1752 }
1753 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1754 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1755 } else if (!DoEscapeAnalysis) {
1756 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1757 AggressiveUnboxing = false;
1758 }
1759 }
1760 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1761 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1762 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1763 }
1764 // Feed the cache size setting into the JDK
1765 char buffer[1024];
1766 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1767 if (!add_property(buffer)) {
1768 return JNI_ENOMEM;
1769 }
1770 }
1771 #endif
1772
1773 return JNI_OK;
1774 }
1775
1776 //===========================================================================================================
1777
1778 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1779 if (_sun_java_launcher != _default_java_launcher) {
1780 os::free(const_cast<char*>(_sun_java_launcher));
1781 }
1782 _sun_java_launcher = os::strdup_check_oom(launcher);
1783 }
1784
1785 bool Arguments::created_by_java_launcher() {
1786 assert(_sun_java_launcher != nullptr, "property must have value");
1787 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1788 }
1789
1790 bool Arguments::executing_unit_tests() {
1791 return _executing_unit_tests;
1792 }
1793
1794 //===========================================================================================================
1795 // Parsing of main arguments
1796
1797 static unsigned int addreads_count = 0;
1798 static unsigned int addexports_count = 0;
1799 static unsigned int addopens_count = 0;
1800 static unsigned int enable_native_access_count = 0;
1801 static bool patch_mod_javabase = false;
1802
1803 // Check the consistency of vm_init_args
1804 bool Arguments::check_vm_args_consistency() {
1805 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1806 if (!CDSConfig::check_vm_args_consistency(mode_flag_cmd_line)) {
1807 return false;
1808 }
1809
1810 // Method for adding checks for flag consistency.
1811 // The intent is to warn the user of all possible conflicts,
1812 // before returning an error.
1813 // Note: Needs platform-dependent factoring.
1814 bool status = true;
1815
1816 if (TLABRefillWasteFraction == 0) {
1817 jio_fprintf(defaultStream::error_stream(),
1818 "TLABRefillWasteFraction should be a denominator, "
1819 "not %zu\n",
1820 TLABRefillWasteFraction);
1821 status = false;
1822 }
1823
1824 status = CompilerConfig::check_args_consistency(status);
1825 #if INCLUDE_JVMCI
1826 if (status && EnableJVMCI) {
1827 // Add the JVMCI module if not using libjvmci or EnableJVMCI
1828 // was explicitly set on the command line or in the jimage.
1829 if ((!UseJVMCINativeLibrary || FLAG_IS_CMDLINE(EnableJVMCI) || FLAG_IS_JIMAGE_RESOURCE(EnableJVMCI)) && ClassLoader::is_module_observable("jdk.internal.vm.ci") && !_jvmci_module_added) {
1830 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1831 return false;
1832 }
1833 }
1834 }
1835 #endif
1836
1837 #if INCLUDE_JFR
1838 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1839 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1840 return false;
1841 }
1842 }
1843 #endif
1844
1845 #ifndef SUPPORT_RESERVED_STACK_AREA
1846 if (StackReservedPages != 0) {
1847 FLAG_SET_CMDLINE(StackReservedPages, 0);
1848 warning("Reserved Stack Area not supported on this platform");
1849 }
1850 #endif
1851
1852 if (UseObjectMonitorTable && LockingMode != LM_LIGHTWEIGHT) {
1853 // ObjectMonitorTable requires lightweight locking.
1854 FLAG_SET_CMDLINE(UseObjectMonitorTable, false);
1855 warning("UseObjectMonitorTable requires LM_LIGHTWEIGHT");
1856 }
1857
1858 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1859 if (LockingMode == LM_MONITOR) {
1860 jio_fprintf(defaultStream::error_stream(),
1861 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1862 return false;
1863 }
1864 #endif
1865 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1866 jio_fprintf(defaultStream::error_stream(),
1867 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1868 return false;
1869 }
1870 return status;
1871 }
1872
1873 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1874 const char* option_type) {
1875 if (ignore) return false;
1876
1877 const char* spacer = " ";
1878 if (option_type == nullptr) {
1879 option_type = ++spacer; // Set both to the empty string.
1880 }
1881
1882 jio_fprintf(defaultStream::error_stream(),
1883 "Unrecognized %s%soption: %s\n", option_type, spacer,
1884 option->optionString);
1885 return true;
1886 }
1887
1888 static const char* user_assertion_options[] = {
1889 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1890 };
1891
1892 static const char* system_assertion_options[] = {
1893 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1894 };
1895
1896 bool Arguments::parse_uint(const char* value,
1897 uint* uint_arg,
1898 uint min_size) {
1899 uint n;
1900 if (!parse_integer(value, &n)) {
1901 return false;
1902 }
1903 if (n >= min_size) {
1904 *uint_arg = n;
1905 return true;
1906 } else {
1907 return false;
1908 }
1909 }
1910
1911 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1912 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1913 CDSConfig::check_internal_module_property(prop_name, prop_value);
1914 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1915 char* property = AllocateHeap(prop_len, mtArguments);
1916 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1917 if (ret < 0 || ret >= (int)prop_len) {
1918 FreeHeap(property);
1919 return false;
1920 }
1921 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1922 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1923 // that multiple occurrences of the associated flag just causes the existing property value to be
1924 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1925 // to a property after we have finished flag processing.
1926 bool added = add_property(property, WriteableProperty, internal);
1927 FreeHeap(property);
1928 return added;
1929 }
1930
1931 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1932 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1933 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1934 const unsigned int props_count_limit = 1000;
1935 const int max_digits = 3;
1936 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1937
1938 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1939 if (count < props_count_limit) {
1940 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1941 char* property = AllocateHeap(prop_len, mtArguments);
1942 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1943 if (ret < 0 || ret >= (int)prop_len) {
1944 FreeHeap(property);
1945 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1946 return false;
1947 }
1948 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1949 FreeHeap(property);
1950 return added;
1951 }
1952
1953 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1954 return false;
1955 }
1956
1957 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1958 julong* long_arg,
1959 julong min_size,
1960 julong max_size) {
1961 if (!parse_integer(s, long_arg)) return arg_unreadable;
1962 return check_memory_size(*long_arg, min_size, max_size);
1963 }
1964
1965 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) {
1966 // Save default settings for some mode flags
1967 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1968 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1969 Arguments::_ClipInlining = ClipInlining;
1970 Arguments::_BackgroundCompilation = BackgroundCompilation;
1971
1972 // Remember the default value of SharedBaseAddress.
1973 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1974
1975 // Setup flags for mixed which is the default
1976 set_mode_flags(_mixed);
1977
1978 jint result;
1979 for (int i = 0; i < all_args->length(); i++) {
1980 result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin);
1981 if (result != JNI_OK) {
1982 return result;
1983 }
1984 }
1985
1986 // Disable CDS for exploded image
1987 if (!has_jimage()) {
1988 no_shared_spaces("CDS disabled on exploded JDK");
1989 }
1990
1991 // We need to ensure processor and memory resources have been properly
1992 // configured - which may rely on arguments we just processed - before
1993 // doing the final argument processing. Any argument processing that
1994 // needs to know about processor and memory resources must occur after
1995 // this point.
1996
1997 os::init_container_support();
1998
1999 SystemMemoryBarrier::initialize();
2000
2001 // Do final processing now that all arguments have been parsed
2002 result = finalize_vm_init_args();
2003 if (result != JNI_OK) {
2004 return result;
2005 }
2006
2007 return JNI_OK;
2008 }
2009
2010 #if !INCLUDE_JVMTI || INCLUDE_CDS
2011 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2012 // represents a valid JDWP agent. is_path==true denotes that we
2013 // are dealing with -agentpath (case where name is a path), otherwise with
2014 // -agentlib
2015 static bool valid_jdwp_agent(char *name, bool is_path) {
2016 char *_name;
2017 const char *_jdwp = "jdwp";
2018 size_t _len_jdwp, _len_prefix;
2019
2020 if (is_path) {
2021 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2022 return false;
2023 }
2024
2025 _name++; // skip past last path separator
2026 _len_prefix = strlen(JNI_LIB_PREFIX);
2027
2028 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2029 return false;
2030 }
2031
2032 _name += _len_prefix;
2033 _len_jdwp = strlen(_jdwp);
2034
2035 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2036 _name += _len_jdwp;
2037 }
2038 else {
2039 return false;
2040 }
2041
2042 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2043 return false;
2044 }
2045
2046 return true;
2047 }
2048
2049 if (strcmp(name, _jdwp) == 0) {
2050 return true;
2051 }
2052
2053 return false;
2054 }
2055 #endif
2056
2057 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2058 // --patch-module=<module>=<file>(<pathsep><file>)*
2059 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2060 // Find the equal sign between the module name and the path specification
2061 const char* module_equal = strchr(patch_mod_tail, '=');
2062 if (module_equal == nullptr) {
2063 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2064 return JNI_ERR;
2065 } else {
2066 // Pick out the module name
2067 size_t module_len = module_equal - patch_mod_tail;
2068 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2069 if (module_name != nullptr) {
2070 memcpy(module_name, patch_mod_tail, module_len);
2071 *(module_name + module_len) = '\0';
2072 // The path piece begins one past the module_equal sign
2073 add_patch_mod_prefix(module_name, module_equal + 1, false /* no append */, false /* no cds */);
2074 FREE_C_HEAP_ARRAY(char, module_name);
2075 } else {
2076 return JNI_ENOMEM;
2077 }
2078 }
2079 return JNI_OK;
2080 }
2081
2082 // VALUECLASS_STR must match string used in the build
2083 #define VALUECLASS_STR "valueclasses"
2084 #define VALUECLASS_JAR "-" VALUECLASS_STR ".jar"
2085
2086 // Finalize --patch-module args and --enable-preview related to value class module patches.
2087 // Create all numbered properties passing module patches.
2088 int Arguments::finalize_patch_module() {
2089 // If --enable-preview and EnableValhalla is true, each module may have value classes that
2090 // are to be patched into the module.
2091 // For each <module>-valueclasses.jar in <JAVA_HOME>/lib/valueclasses/
2092 // appends the equivalent of --patch-module <module>=<JAVA_HOME>/lib/valueclasses/<module>-valueclasses.jar
2093 if (enable_preview() && EnableValhalla) {
2094 char * valueclasses_dir = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2095 const char * fileSep = os::file_separator();
2096
2097 jio_snprintf(valueclasses_dir, JVM_MAXPATHLEN, "%s%slib%s" VALUECLASS_STR "%s",
2098 Arguments::get_java_home(), fileSep, fileSep, fileSep);
2099 DIR* dir = os::opendir(valueclasses_dir);
2100 if (dir != nullptr) {
2101 char * module_name = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2102 char * path = AllocateHeap(JVM_MAXPATHLEN, mtArguments);
2103
2104 for (dirent * entry = os::readdir(dir); entry != nullptr; entry = os::readdir(dir)) {
2105 // Test if file ends-with "-valueclasses.jar"
2106 int len = (int)strlen(entry->d_name) - (sizeof(VALUECLASS_JAR) - 1);
2107 if (len <= 0 || strcmp(&entry->d_name[len], VALUECLASS_JAR) != 0) {
2108 continue; // too short or not the expected suffix
2109 }
2110
2111 strcpy(module_name, entry->d_name);
2112 module_name[len] = '\0'; // truncate to just module-name
2113
2114 jio_snprintf(path, JVM_MAXPATHLEN, "%s%s", valueclasses_dir, &entry->d_name);
2115 add_patch_mod_prefix(module_name, path, true /* append */, true /* cds OK*/);
2116 log_info(class)("--enable-preview appending value classes for module %s: %s", module_name, entry->d_name);
2117 }
2118 FreeHeap(module_name);
2119 FreeHeap(path);
2120 os::closedir(dir);
2121 }
2122 FreeHeap(valueclasses_dir);
2123 }
2124
2125 // Create numbered properties for each module that has been patched either
2126 // by --patch-module or --enable-preview
2127 // Format is "jdk.module.patch.<n>=<module_name>=<path>"
2128 if (_patch_mod_prefix != nullptr) {
2129 char * prop_value = AllocateHeap(JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, mtArguments);
2130 unsigned int patch_mod_count = 0;
2131
2132 for (GrowableArrayIterator<ModulePatchPath *> it = _patch_mod_prefix->begin();
2133 it != _patch_mod_prefix->end(); ++it) {
2134 jio_snprintf(prop_value, JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, "%s=%s",
2135 (*it)->module_name(), (*it)->path_string());
2136 if (!create_numbered_module_property("jdk.module.patch", prop_value, patch_mod_count++)) {
2137 FreeHeap(prop_value);
2138 return JNI_ENOMEM;
2139 }
2140 }
2141 FreeHeap(prop_value);
2142 }
2143 return JNI_OK;
2144 }
2145
2146 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2147 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2148 // The min and max sizes match the values in globals.hpp, but scaled
2149 // with K. The values have been chosen so that alignment with page
2150 // size doesn't change the max value, which makes the conversions
2151 // back and forth between Xss value and ThreadStackSize value easier.
2152 // The values have also been chosen to fit inside a 32-bit signed type.
2153 const julong min_ThreadStackSize = 0;
2154 const julong max_ThreadStackSize = 1 * M;
2155
2156 // Make sure the above values match the range set in globals.hpp
2157 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2158 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2159 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2160
2161 const julong min_size = min_ThreadStackSize * K;
2162 const julong max_size = max_ThreadStackSize * K;
2163
2164 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2165
2166 julong size = 0;
2167 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2168 if (errcode != arg_in_range) {
2169 bool silent = (option == nullptr); // Allow testing to silence error messages
2170 if (!silent) {
2171 jio_fprintf(defaultStream::error_stream(),
2172 "Invalid thread stack size: %s\n", option->optionString);
2173 describe_range_error(errcode);
2174 }
2175 return JNI_EINVAL;
2176 }
2177
2178 // Internally track ThreadStackSize in units of 1024 bytes.
2179 const julong size_aligned = align_up(size, K);
2180 assert(size <= size_aligned,
2181 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2182 size, size_aligned);
2183
2184 const julong size_in_K = size_aligned / K;
2185 assert(size_in_K < (julong)max_intx,
2186 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2187 size_in_K);
2188
2189 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2190 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2191 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2192 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2193 max_expanded, size_in_K);
2194
2195 *out_ThreadStackSize = (intx)size_in_K;
2196
2197 return JNI_OK;
2198 }
2199
2200 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2201 // For match_option to return remaining or value part of option string
2202 const char* tail;
2203
2204 // iterate over arguments
2205 for (int index = 0; index < args->nOptions; index++) {
2206 bool is_absolute_path = false; // for -agentpath vs -agentlib
2207
2208 const JavaVMOption* option = args->options + index;
2209
2210 if (!match_option(option, "-Djava.class.path", &tail) &&
2211 !match_option(option, "-Dsun.java.command", &tail) &&
2212 !match_option(option, "-Dsun.java.launcher", &tail)) {
2213
2214 // add all jvm options to the jvm_args string. This string
2215 // is used later to set the java.vm.args PerfData string constant.
2216 // the -Djava.class.path and the -Dsun.java.command options are
2217 // omitted from jvm_args string as each have their own PerfData
2218 // string constant object.
2219 build_jvm_args(option->optionString);
2220 }
2221
2222 // -verbose:[class/module/gc/jni]
2223 if (match_option(option, "-verbose", &tail)) {
2224 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2225 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2226 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2227 } else if (!strcmp(tail, ":module")) {
2228 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2229 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2230 } else if (!strcmp(tail, ":gc")) {
2231 if (_legacyGCLogging.lastFlag == 0) {
2232 _legacyGCLogging.lastFlag = 1;
2233 }
2234 } else if (!strcmp(tail, ":jni")) {
2235 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2236 }
2237 // -da / -ea / -disableassertions / -enableassertions
2238 // These accept an optional class/package name separated by a colon, e.g.,
2239 // -da:java.lang.Thread.
2240 } else if (match_option(option, user_assertion_options, &tail, true)) {
2241 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2242 if (*tail == '\0') {
2243 JavaAssertions::setUserClassDefault(enable);
2244 } else {
2245 assert(*tail == ':', "bogus match by match_option()");
2246 JavaAssertions::addOption(tail + 1, enable);
2247 }
2248 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2249 } else if (match_option(option, system_assertion_options, &tail, false)) {
2250 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2251 JavaAssertions::setSystemClassDefault(enable);
2252 // -bootclasspath:
2253 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2254 jio_fprintf(defaultStream::output_stream(),
2255 "-Xbootclasspath is no longer a supported option.\n");
2256 return JNI_EINVAL;
2257 // -bootclasspath/a:
2258 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2259 Arguments::append_sysclasspath(tail);
2260 // -bootclasspath/p:
2261 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2262 jio_fprintf(defaultStream::output_stream(),
2263 "-Xbootclasspath/p is no longer a supported option.\n");
2264 return JNI_EINVAL;
2265 // -Xrun
2266 } else if (match_option(option, "-Xrun", &tail)) {
2267 if (tail != nullptr) {
2268 const char* pos = strchr(tail, ':');
2269 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2270 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2271 jio_snprintf(name, len + 1, "%s", tail);
2272
2273 char *options = nullptr;
2274 if(pos != nullptr) {
2275 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2276 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2277 }
2278 #if !INCLUDE_JVMTI
2279 if (strcmp(name, "jdwp") == 0) {
2280 jio_fprintf(defaultStream::error_stream(),
2281 "Debugging agents are not supported in this VM\n");
2282 return JNI_ERR;
2283 }
2284 #endif // !INCLUDE_JVMTI
2285 JvmtiAgentList::add_xrun(name, options, false);
2286 FREE_C_HEAP_ARRAY(char, name);
2287 FREE_C_HEAP_ARRAY(char, options);
2288 }
2289 } else if (match_option(option, "--add-reads=", &tail)) {
2290 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2291 return JNI_ENOMEM;
2292 }
2293 } else if (match_option(option, "--add-exports=", &tail)) {
2294 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2295 return JNI_ENOMEM;
2296 }
2297 } else if (match_option(option, "--add-opens=", &tail)) {
2298 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2299 return JNI_ENOMEM;
2300 }
2301 } else if (match_option(option, "--add-modules=", &tail)) {
2302 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2303 return JNI_ENOMEM;
2304 }
2305 #if INCLUDE_JVMCI
2306 if (!_jvmci_module_added) {
2307 const char *jvmci_module = strstr(tail, "jdk.internal.vm.ci");
2308 if (jvmci_module != nullptr) {
2309 char before = *(jvmci_module - 1);
2310 char after = *(jvmci_module + strlen("jdk.internal.vm.ci"));
2311 if ((before == '=' || before == ',') && (after == '\0' || after == ',')) {
2312 FLAG_SET_DEFAULT(EnableJVMCI, true);
2313 _jvmci_module_added = true;
2314 }
2315 }
2316 }
2317 #endif
2318 } else if (match_option(option, "--enable-native-access=", &tail)) {
2319 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2320 return JNI_ENOMEM;
2321 }
2322 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2323 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2324 return JNI_ENOMEM;
2325 }
2326 } else if (match_option(option, "--limit-modules=", &tail)) {
2327 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2328 return JNI_ENOMEM;
2329 }
2330 } else if (match_option(option, "--module-path=", &tail)) {
2331 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2332 return JNI_ENOMEM;
2333 }
2334 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2335 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2336 return JNI_ENOMEM;
2337 }
2338 } else if (match_option(option, "--patch-module=", &tail)) {
2339 // --patch-module=<module>=<file>(<pathsep><file>)*
2340 int res = process_patch_mod_option(tail);
2341 if (res != JNI_OK) {
2342 return res;
2343 }
2344 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2345 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2346 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2347 AddProperty, WriteableProperty, InternalProperty);
2348 } else {
2349 jio_fprintf(defaultStream::error_stream(),
2350 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2351 return JNI_ERR;
2352 }
2353 } else if (match_option(option, "--illegal-access=", &tail)) {
2354 char version[256];
2355 JDK_Version::jdk(17).to_string(version, sizeof(version));
2356 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2357 // -agentlib and -agentpath
2358 } else if (match_option(option, "-agentlib:", &tail) ||
2359 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2360 if(tail != nullptr) {
2361 const char* pos = strchr(tail, '=');
2362 char* name;
2363 if (pos == nullptr) {
2364 name = os::strdup_check_oom(tail, mtArguments);
2365 } else {
2366 size_t len = pos - tail;
2367 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2368 memcpy(name, tail, len);
2369 name[len] = '\0';
2370 }
2371
2372 char *options = nullptr;
2373 if(pos != nullptr) {
2374 options = os::strdup_check_oom(pos + 1, mtArguments);
2375 }
2376 #if !INCLUDE_JVMTI
2377 if (valid_jdwp_agent(name, is_absolute_path)) {
2378 jio_fprintf(defaultStream::error_stream(),
2379 "Debugging agents are not supported in this VM\n");
2380 return JNI_ERR;
2381 }
2382 #elif INCLUDE_CDS
2383 if (valid_jdwp_agent(name, is_absolute_path)) {
2384 _has_jdwp_agent = true;
2385 }
2386 #endif // !INCLUDE_JVMTI
2387 JvmtiAgentList::add(name, options, is_absolute_path);
2388 os::free(name);
2389 os::free(options);
2390 }
2391 // -javaagent
2392 } else if (match_option(option, "-javaagent:", &tail)) {
2393 #if !INCLUDE_JVMTI
2394 jio_fprintf(defaultStream::error_stream(),
2395 "Instrumentation agents are not supported in this VM\n");
2396 return JNI_ERR;
2397 #else
2398 if (tail != nullptr) {
2399 size_t length = strlen(tail) + 1;
2400 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2401 jio_snprintf(options, length, "%s", tail);
2402 JvmtiAgentList::add("instrument", options, false);
2403 FREE_C_HEAP_ARRAY(char, options);
2404
2405 // java agents need module java.instrument
2406 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2407 return JNI_ENOMEM;
2408 }
2409 }
2410 #endif // !INCLUDE_JVMTI
2411 // --enable_preview
2412 } else if (match_option(option, "--enable-preview")) {
2413 set_enable_preview();
2414 // --enable-preview enables Valhalla, EnableValhalla VM option will eventually be removed before integration
2415 if (FLAG_SET_CMDLINE(EnableValhalla, true) != JVMFlag::SUCCESS) {
2416 return JNI_EINVAL;
2417 }
2418 // -Xnoclassgc
2419 } else if (match_option(option, "-Xnoclassgc")) {
2420 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2421 return JNI_EINVAL;
2422 }
2423 // -Xbatch
2424 } else if (match_option(option, "-Xbatch")) {
2425 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2426 return JNI_EINVAL;
2427 }
2428 // -Xmn for compatibility with other JVM vendors
2429 } else if (match_option(option, "-Xmn", &tail)) {
2430 julong long_initial_young_size = 0;
2431 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2432 if (errcode != arg_in_range) {
2433 jio_fprintf(defaultStream::error_stream(),
2434 "Invalid initial young generation size: %s\n", option->optionString);
2435 describe_range_error(errcode);
2436 return JNI_EINVAL;
2437 }
2438 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2439 return JNI_EINVAL;
2440 }
2441 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2442 return JNI_EINVAL;
2443 }
2444 // -Xms
2445 } else if (match_option(option, "-Xms", &tail)) {
2446 julong size = 0;
2447 // an initial heap size of 0 means automatically determine
2448 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2449 if (errcode != arg_in_range) {
2450 jio_fprintf(defaultStream::error_stream(),
2451 "Invalid initial heap size: %s\n", option->optionString);
2452 describe_range_error(errcode);
2453 return JNI_EINVAL;
2454 }
2455 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2456 return JNI_EINVAL;
2457 }
2458 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2459 return JNI_EINVAL;
2460 }
2461 // -Xmx
2462 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2463 julong long_max_heap_size = 0;
2464 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2465 if (errcode != arg_in_range) {
2466 jio_fprintf(defaultStream::error_stream(),
2467 "Invalid maximum heap size: %s\n", option->optionString);
2468 describe_range_error(errcode);
2469 return JNI_EINVAL;
2470 }
2471 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2472 return JNI_EINVAL;
2473 }
2474 // Xmaxf
2475 } else if (match_option(option, "-Xmaxf", &tail)) {
2476 char* err;
2477 int maxf = (int)(strtod(tail, &err) * 100);
2478 if (*err != '\0' || *tail == '\0') {
2479 jio_fprintf(defaultStream::error_stream(),
2480 "Bad max heap free percentage size: %s\n",
2481 option->optionString);
2482 return JNI_EINVAL;
2483 } else {
2484 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2485 return JNI_EINVAL;
2486 }
2487 }
2488 // Xminf
2489 } else if (match_option(option, "-Xminf", &tail)) {
2490 char* err;
2491 int minf = (int)(strtod(tail, &err) * 100);
2492 if (*err != '\0' || *tail == '\0') {
2493 jio_fprintf(defaultStream::error_stream(),
2494 "Bad min heap free percentage size: %s\n",
2495 option->optionString);
2496 return JNI_EINVAL;
2497 } else {
2498 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2499 return JNI_EINVAL;
2500 }
2501 }
2502 // -Xss
2503 } else if (match_option(option, "-Xss", &tail)) {
2504 intx value = 0;
2505 jint err = parse_xss(option, tail, &value);
2506 if (err != JNI_OK) {
2507 return err;
2508 }
2509 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2510 return JNI_EINVAL;
2511 }
2512 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2513 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2514 julong long_ReservedCodeCacheSize = 0;
2515
2516 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2517 if (errcode != arg_in_range) {
2518 jio_fprintf(defaultStream::error_stream(),
2519 "Invalid maximum code cache size: %s.\n", option->optionString);
2520 return JNI_EINVAL;
2521 }
2522 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2523 return JNI_EINVAL;
2524 }
2525 // -green
2526 } else if (match_option(option, "-green")) {
2527 jio_fprintf(defaultStream::error_stream(),
2528 "Green threads support not available\n");
2529 return JNI_EINVAL;
2530 // -native
2531 } else if (match_option(option, "-native")) {
2532 // HotSpot always uses native threads, ignore silently for compatibility
2533 // -Xrs
2534 } else if (match_option(option, "-Xrs")) {
2535 // Classic/EVM option, new functionality
2536 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2537 return JNI_EINVAL;
2538 }
2539 // -Xprof
2540 } else if (match_option(option, "-Xprof")) {
2541 char version[256];
2542 // Obsolete in JDK 10
2543 JDK_Version::jdk(10).to_string(version, sizeof(version));
2544 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2545 // -Xinternalversion
2546 } else if (match_option(option, "-Xinternalversion")) {
2547 jio_fprintf(defaultStream::output_stream(), "%s\n",
2548 VM_Version::internal_vm_info_string());
2549 vm_exit(0);
2550 #ifndef PRODUCT
2551 // -Xprintflags
2552 } else if (match_option(option, "-Xprintflags")) {
2553 JVMFlag::printFlags(tty, false);
2554 vm_exit(0);
2555 #endif
2556 // -D
2557 } else if (match_option(option, "-D", &tail)) {
2558 const char* value;
2559 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2560 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2561 // abort if -Djava.endorsed.dirs is set
2562 jio_fprintf(defaultStream::output_stream(),
2563 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2564 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2565 return JNI_EINVAL;
2566 }
2567 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2568 *value != '\0' && strcmp(value, "\"\"") != 0) {
2569 // abort if -Djava.ext.dirs is set
2570 jio_fprintf(defaultStream::output_stream(),
2571 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2572 return JNI_EINVAL;
2573 }
2574 // Check for module related properties. They must be set using the modules
2575 // options. For example: use "--add-modules=java.sql", not
2576 // "-Djdk.module.addmods=java.sql"
2577 if (is_internal_module_property(option->optionString + 2)) {
2578 needs_module_property_warning = true;
2579 continue;
2580 }
2581 if (!add_property(tail)) {
2582 return JNI_ENOMEM;
2583 }
2584 // Out of the box management support
2585 if (match_option(option, "-Dcom.sun.management", &tail)) {
2586 #if INCLUDE_MANAGEMENT
2587 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2588 return JNI_EINVAL;
2589 }
2590 // management agent in module jdk.management.agent
2591 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2592 return JNI_ENOMEM;
2593 }
2594 #else
2595 jio_fprintf(defaultStream::output_stream(),
2596 "-Dcom.sun.management is not supported in this VM.\n");
2597 return JNI_ERR;
2598 #endif
2599 }
2600 // -Xint
2601 } else if (match_option(option, "-Xint")) {
2602 set_mode_flags(_int);
2603 mode_flag_cmd_line = true;
2604 // -Xmixed
2605 } else if (match_option(option, "-Xmixed")) {
2606 set_mode_flags(_mixed);
2607 mode_flag_cmd_line = true;
2608 // -Xcomp
2609 } else if (match_option(option, "-Xcomp")) {
2610 // for testing the compiler; turn off all flags that inhibit compilation
2611 set_mode_flags(_comp);
2612 mode_flag_cmd_line = true;
2613 // -Xshare:dump
2614 } else if (match_option(option, "-Xshare:dump")) {
2615 CDSConfig::enable_dumping_static_archive();
2616 CDSConfig::set_old_cds_flags_used();
2617 // -Xshare:on
2618 } else if (match_option(option, "-Xshare:on")) {
2619 UseSharedSpaces = true;
2620 RequireSharedSpaces = true;
2621 CDSConfig::set_old_cds_flags_used();
2622 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2623 } else if (match_option(option, "-Xshare:auto")) {
2624 UseSharedSpaces = true;
2625 RequireSharedSpaces = false;
2626 xshare_auto_cmd_line = true;
2627 CDSConfig::set_old_cds_flags_used();
2628 // -Xshare:off
2629 } else if (match_option(option, "-Xshare:off")) {
2630 UseSharedSpaces = false;
2631 RequireSharedSpaces = false;
2632 CDSConfig::set_old_cds_flags_used();
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 } else if (match_option(option, "-Xloggc:", &tail)) {
2664 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2665 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2666 _legacyGCLogging.lastFlag = 2;
2667 _legacyGCLogging.file = os::strdup_check_oom(tail);
2668 } else if (match_option(option, "-Xlog", &tail)) {
2669 bool ret = false;
2670 if (strcmp(tail, ":help") == 0) {
2671 fileStream stream(defaultStream::output_stream());
2672 LogConfiguration::print_command_line_help(&stream);
2673 vm_exit(0);
2674 } else if (strcmp(tail, ":disable") == 0) {
2675 LogConfiguration::disable_logging();
2676 ret = true;
2677 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2678 const char* async_tail = tail + strlen(":async");
2679 ret = LogConfiguration::parse_async_argument(async_tail);
2680 } else if (*tail == '\0') {
2681 ret = LogConfiguration::parse_command_line_arguments();
2682 assert(ret, "-Xlog without arguments should never fail to parse");
2683 } else if (*tail == ':') {
2684 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2685 }
2686 if (ret == false) {
2687 jio_fprintf(defaultStream::error_stream(),
2688 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2689 tail);
2690 return JNI_EINVAL;
2691 }
2692 // JNI hooks
2693 } else if (match_option(option, "-Xcheck", &tail)) {
2694 if (!strcmp(tail, ":jni")) {
2695 #if !INCLUDE_JNI_CHECK
2696 warning("JNI CHECKING is not supported in this VM");
2697 #else
2698 CheckJNICalls = true;
2699 #endif // INCLUDE_JNI_CHECK
2700 } else if (is_bad_option(option, args->ignoreUnrecognized,
2701 "check")) {
2702 return JNI_EINVAL;
2703 }
2704 } else if (match_option(option, "vfprintf")) {
2705 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2706 } else if (match_option(option, "exit")) {
2707 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2708 } else if (match_option(option, "abort")) {
2709 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2710 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2711 // and the last option wins.
2712 } else if (match_option(option, "-XX:+NeverTenure")) {
2713 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2714 return JNI_EINVAL;
2715 }
2716 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2717 return JNI_EINVAL;
2718 }
2719 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2720 return JNI_EINVAL;
2721 }
2722 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2723 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2724 return JNI_EINVAL;
2725 }
2726 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2727 return JNI_EINVAL;
2728 }
2729 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2730 return JNI_EINVAL;
2731 }
2732 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2733 uint max_tenuring_thresh = 0;
2734 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2735 jio_fprintf(defaultStream::error_stream(),
2736 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2737 return JNI_EINVAL;
2738 }
2739
2740 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2741 return JNI_EINVAL;
2742 }
2743
2744 if (MaxTenuringThreshold == 0) {
2745 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2746 return JNI_EINVAL;
2747 }
2748 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2749 return JNI_EINVAL;
2750 }
2751 } else {
2752 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2753 return JNI_EINVAL;
2754 }
2755 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2756 return JNI_EINVAL;
2757 }
2758 }
2759 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2760 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2761 return JNI_EINVAL;
2762 }
2763 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2764 return JNI_EINVAL;
2765 }
2766 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2767 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2768 return JNI_EINVAL;
2769 }
2770 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2771 return JNI_EINVAL;
2772 }
2773 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2774 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2775 return JNI_EINVAL;
2776 }
2777 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2778 return JNI_EINVAL;
2779 }
2780 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2781 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2782 return JNI_EINVAL;
2783 }
2784 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2785 return JNI_EINVAL;
2786 }
2787 } else if (match_option(option, "--finalization=", &tail)) {
2788 if (strcmp(tail, "enabled") == 0) {
2789 InstanceKlass::set_finalization_enabled(true);
2790 } else if (strcmp(tail, "disabled") == 0) {
2791 InstanceKlass::set_finalization_enabled(false);
2792 } else {
2793 jio_fprintf(defaultStream::error_stream(),
2794 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2795 tail);
2796 return JNI_EINVAL;
2797 }
2798 #if !defined(DTRACE_ENABLED)
2799 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2800 jio_fprintf(defaultStream::error_stream(),
2801 "DTraceMethodProbes flag is not applicable for this configuration\n");
2802 return JNI_EINVAL;
2803 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2804 jio_fprintf(defaultStream::error_stream(),
2805 "DTraceAllocProbes flag is not applicable for this configuration\n");
2806 return JNI_EINVAL;
2807 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2808 jio_fprintf(defaultStream::error_stream(),
2809 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2810 return JNI_EINVAL;
2811 #endif // !defined(DTRACE_ENABLED)
2812 #ifdef ASSERT
2813 } else if (match_option(option, "-XX:+FullGCALot")) {
2814 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2815 return JNI_EINVAL;
2816 }
2817 #endif
2818 #if !INCLUDE_MANAGEMENT
2819 } else if (match_option(option, "-XX:+ManagementServer")) {
2820 jio_fprintf(defaultStream::error_stream(),
2821 "ManagementServer is not supported in this VM.\n");
2822 return JNI_ERR;
2823 #endif // INCLUDE_MANAGEMENT
2824 #if INCLUDE_JVMCI
2825 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2826 if (EnableJVMCIProduct) {
2827 jio_fprintf(defaultStream::error_stream(),
2828 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2829 return JNI_EINVAL;
2830 }
2831 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2832 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2833 if (use_graal_jit) {
2834 const char* jvmci_compiler = get_property("jvmci.Compiler");
2835 if (jvmci_compiler != nullptr) {
2836 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2837 jio_fprintf(defaultStream::error_stream(),
2838 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2839 return JNI_ERR;
2840 }
2841 } else if (!add_property("jvmci.Compiler=graal")) {
2842 return JNI_ENOMEM;
2843 }
2844 }
2845
2846 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2847 if (EnableJVMCIProduct) {
2848 continue;
2849 }
2850 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2851 // Allow this flag if it has been unlocked.
2852 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2853 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2854 jio_fprintf(defaultStream::error_stream(),
2855 "Unable to enable JVMCI in product mode\n");
2856 return JNI_ERR;
2857 }
2858 }
2859 // The flag was locked so process normally to report that error
2860 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2861 return JNI_EINVAL;
2862 }
2863 #endif // INCLUDE_JVMCI
2864 #if INCLUDE_JFR
2865 } else if (match_jfr_option(&option)) {
2866 return JNI_EINVAL;
2867 #endif
2868 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2869 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2870 // already been handled
2871 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2872 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2873 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2874 return JNI_EINVAL;
2875 }
2876 }
2877 // Unknown option
2878 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2879 return JNI_ERR;
2880 }
2881 }
2882
2883 // PrintSharedArchiveAndExit will turn on
2884 // -Xshare:on
2885 // -Xlog:class+path=info
2886 if (PrintSharedArchiveAndExit) {
2887 UseSharedSpaces = true;
2888 RequireSharedSpaces = true;
2889 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2890 }
2891
2892 fix_appclasspath();
2893
2894 return JNI_OK;
2895 }
2896
2897 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool allow_append, bool allow_cds) {
2898 if (!allow_cds) {
2899 CDSConfig::set_module_patching_disables_cds();
2900 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2901 CDSConfig::set_java_base_module_patching_disables_cds();
2902 }
2903 }
2904
2905 // Create GrowableArray lazily, only if --patch-module has been specified
2906 if (_patch_mod_prefix == nullptr) {
2907 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2908 }
2909
2910 // Scan patches for matching module
2911 int i = _patch_mod_prefix->find_if([&](ModulePatchPath* patch) {
2912 return (strcmp(module_name, patch->module_name()) == 0);
2913 });
2914 if (i == -1) {
2915 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2916 } else {
2917 if (allow_append) {
2918 // append path to existing module entry
2919 _patch_mod_prefix->at(i)->append_path(path);
2920 } else {
2921 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2922 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2923 } else {
2924 vm_exit_during_initialization("Cannot specify a module more than once to --patch-module", module_name);
2925 }
2926 }
2927 }
2928 }
2929
2930 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2931 //
2932 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2933 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2934 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2935 // path is treated as the current directory.
2936 //
2937 // This causes problems with CDS, which requires that all directories specified in the classpath
2938 // must be empty. In most cases, applications do NOT want to load classes from the current
2939 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2940 // scripts compatible with CDS.
2941 void Arguments::fix_appclasspath() {
2942 if (IgnoreEmptyClassPaths) {
2943 const char separator = *os::path_separator();
2944 const char* src = _java_class_path->value();
2945
2946 // skip over all the leading empty paths
2947 while (*src == separator) {
2948 src ++;
2949 }
2950
2951 char* copy = os::strdup_check_oom(src, mtArguments);
2952
2953 // trim all trailing empty paths
2954 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2955 *tail = '\0';
2956 }
2957
2958 char from[3] = {separator, separator, '\0'};
2959 char to [2] = {separator, '\0'};
2960 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2961 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2962 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2963 }
2964
2965 _java_class_path->set_writeable_value(copy);
2966 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2967 }
2968 }
2969
2970 jint Arguments::finalize_vm_init_args() {
2971 // check if the default lib/endorsed directory exists; if so, error
2972 char path[JVM_MAXPATHLEN];
2973 const char* fileSep = os::file_separator();
2974 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2975
2976 DIR* dir = os::opendir(path);
2977 if (dir != nullptr) {
2978 jio_fprintf(defaultStream::output_stream(),
2979 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2980 "in modular form will be supported via the concept of upgradeable modules.\n");
2981 os::closedir(dir);
2982 return JNI_ERR;
2983 }
2984
2985 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2986 dir = os::opendir(path);
2987 if (dir != nullptr) {
2988 jio_fprintf(defaultStream::output_stream(),
2989 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2990 "Use -classpath instead.\n.");
2991 os::closedir(dir);
2992 return JNI_ERR;
2993 }
2994
2995 // This must be done after all arguments have been processed
2996 // and the container support has been initialized since AggressiveHeap
2997 // relies on the amount of total memory available.
2998 if (AggressiveHeap) {
2999 jint result = set_aggressive_heap_flags();
3000 if (result != JNI_OK) {
3001 return result;
3002 }
3003 }
3004
3005 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3006 // but like -Xint, leave compilation thresholds unaffected.
3007 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3008 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3009 set_mode_flags(_int);
3010 }
3011
3012 #ifdef ZERO
3013 // Zero always runs in interpreted mode
3014 set_mode_flags(_int);
3015 #endif
3016
3017 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3018 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3019 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3020 }
3021
3022 #if !COMPILER2_OR_JVMCI
3023 // Don't degrade server performance for footprint
3024 if (FLAG_IS_DEFAULT(UseLargePages) &&
3025 MaxHeapSize < LargePageHeapSizeThreshold) {
3026 // No need for large granularity pages w/small heaps.
3027 // Note that large pages are enabled/disabled for both the
3028 // Java heap and the code cache.
3029 FLAG_SET_DEFAULT(UseLargePages, false);
3030 }
3031
3032 UNSUPPORTED_OPTION(ProfileInterpreter);
3033 #endif
3034
3035 // Parse the CompilationMode flag
3036 if (!CompilationModeFlag::initialize()) {
3037 return JNI_ERR;
3038 }
3039
3040 // finalize --module-patch and related --enable-preview
3041 if (finalize_patch_module() != JNI_OK) {
3042 return JNI_ERR;
3043 }
3044
3045 if (!check_vm_args_consistency()) {
3046 return JNI_ERR;
3047 }
3048
3049 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3050 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3051 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3052
3053 return JNI_OK;
3054 }
3055
3056 // Helper class for controlling the lifetime of JavaVMInitArgs
3057 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3058 // deleted on the destruction of the ScopedVMInitArgs object.
3059 class ScopedVMInitArgs : public StackObj {
3060 private:
3061 JavaVMInitArgs _args;
3062 char* _container_name;
3063 bool _is_set;
3064 char* _vm_options_file_arg;
3065
3066 public:
3067 ScopedVMInitArgs(const char *container_name) {
3068 _args.version = JNI_VERSION_1_2;
3069 _args.nOptions = 0;
3070 _args.options = nullptr;
3071 _args.ignoreUnrecognized = false;
3072 _container_name = (char *)container_name;
3073 _is_set = false;
3074 _vm_options_file_arg = nullptr;
3075 }
3076
3077 // Populates the JavaVMInitArgs object represented by this
3078 // ScopedVMInitArgs object with the arguments in options. The
3079 // allocated memory is deleted by the destructor. If this method
3080 // returns anything other than JNI_OK, then this object is in a
3081 // partially constructed state, and should be abandoned.
3082 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3083 _is_set = true;
3084 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3085 JavaVMOption, options->length(), mtArguments);
3086 if (options_arr == nullptr) {
3087 return JNI_ENOMEM;
3088 }
3089 _args.options = options_arr;
3090
3091 for (int i = 0; i < options->length(); i++) {
3092 options_arr[i] = options->at(i);
3093 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3094 if (options_arr[i].optionString == nullptr) {
3095 // Rely on the destructor to do cleanup.
3096 _args.nOptions = i;
3097 return JNI_ENOMEM;
3098 }
3099 }
3100
3101 _args.nOptions = options->length();
3102 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3103 return JNI_OK;
3104 }
3105
3106 JavaVMInitArgs* get() { return &_args; }
3107 char* container_name() { return _container_name; }
3108 bool is_set() { return _is_set; }
3109 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3110 char* vm_options_file_arg() { return _vm_options_file_arg; }
3111
3112 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3113 if (_vm_options_file_arg != nullptr) {
3114 os::free(_vm_options_file_arg);
3115 }
3116 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3117 }
3118
3119 ~ScopedVMInitArgs() {
3120 if (_vm_options_file_arg != nullptr) {
3121 os::free(_vm_options_file_arg);
3122 }
3123 if (_args.options == nullptr) return;
3124 for (int i = 0; i < _args.nOptions; i++) {
3125 os::free(_args.options[i].optionString);
3126 }
3127 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3128 }
3129
3130 // Insert options into this option list, to replace option at
3131 // vm_options_file_pos (-XX:VMOptionsFile)
3132 jint insert(const JavaVMInitArgs* args,
3133 const JavaVMInitArgs* args_to_insert,
3134 const int vm_options_file_pos) {
3135 assert(_args.options == nullptr, "shouldn't be set yet");
3136 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3137 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3138
3139 int length = args->nOptions + args_to_insert->nOptions - 1;
3140 // Construct new option array
3141 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3142 for (int i = 0; i < args->nOptions; i++) {
3143 if (i == vm_options_file_pos) {
3144 // insert the new options starting at the same place as the
3145 // -XX:VMOptionsFile option
3146 for (int j = 0; j < args_to_insert->nOptions; j++) {
3147 options.push(args_to_insert->options[j]);
3148 }
3149 } else {
3150 options.push(args->options[i]);
3151 }
3152 }
3153 // make into options array
3154 return set_args(&options);
3155 }
3156 };
3157
3158 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3159 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3160 }
3161
3162 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3163 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3164 }
3165
3166 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) {
3167 for (int index = args->nOptions - 1; index >= 0; index--) {
3168 JavaVMOption* option = args->options + index;
3169 if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) {
3170 return option;
3171 }
3172 }
3173
3174 return nullptr;
3175 }
3176
3177 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args,
3178 ScopedVMInitArgs* jdk_aot_vm_options_args) {
3179 // Don't bother scanning all the args if this env variable is not set
3180 if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) {
3181 return JNI_OK;
3182 }
3183
3184 // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value
3185 // of AOTMode.
3186 JavaVMOption* option = nullptr;
3187 for (int i = all_args->length() - 1; i >= 0; i--) {
3188 if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) {
3189 break;
3190 }
3191 }
3192
3193 if (option != nullptr) {
3194 // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet,
3195 // so its value is not reflected inside the global variable AOTMode.
3196 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) {
3197 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3198 }
3199 } else {
3200 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode,
3201 // which would have been set inside process_settings_file();
3202 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) {
3203 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3204 }
3205 }
3206
3207 return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args);
3208 }
3209
3210 jint Arguments::parse_options_environment_variable(const char* name,
3211 ScopedVMInitArgs* vm_args) {
3212 char *buffer = ::getenv(name);
3213
3214 // Don't check this environment variable if user has special privileges
3215 // (e.g. unix su command).
3216 if (buffer == nullptr || os::have_special_privileges()) {
3217 return JNI_OK;
3218 }
3219
3220 if ((buffer = os::strdup(buffer)) == nullptr) {
3221 return JNI_ENOMEM;
3222 }
3223
3224 jio_fprintf(defaultStream::error_stream(),
3225 "Picked up %s: %s\n", name, buffer);
3226
3227 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3228
3229 os::free(buffer);
3230 return retcode;
3231 }
3232
3233 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3234 // read file into buffer
3235 int fd = ::open(file_name, O_RDONLY);
3236 if (fd < 0) {
3237 jio_fprintf(defaultStream::error_stream(),
3238 "Could not open options file '%s'\n",
3239 file_name);
3240 return JNI_ERR;
3241 }
3242
3243 struct stat stbuf;
3244 int retcode = os::stat(file_name, &stbuf);
3245 if (retcode != 0) {
3246 jio_fprintf(defaultStream::error_stream(),
3247 "Could not stat options file '%s'\n",
3248 file_name);
3249 ::close(fd);
3250 return JNI_ERR;
3251 }
3252
3253 if (stbuf.st_size == 0) {
3254 // tell caller there is no option data and that is ok
3255 ::close(fd);
3256 return JNI_OK;
3257 }
3258
3259 // '+ 1' for null termination even with max bytes
3260 size_t bytes_alloc = stbuf.st_size + 1;
3261
3262 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3263 if (nullptr == buf) {
3264 jio_fprintf(defaultStream::error_stream(),
3265 "Could not allocate read buffer for options file parse\n");
3266 ::close(fd);
3267 return JNI_ENOMEM;
3268 }
3269
3270 memset(buf, 0, bytes_alloc);
3271
3272 // Fill buffer
3273 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3274 ::close(fd);
3275 if (bytes_read < 0) {
3276 FREE_C_HEAP_ARRAY(char, buf);
3277 jio_fprintf(defaultStream::error_stream(),
3278 "Could not read options file '%s'\n", file_name);
3279 return JNI_ERR;
3280 }
3281
3282 if (bytes_read == 0) {
3283 // tell caller there is no option data and that is ok
3284 FREE_C_HEAP_ARRAY(char, buf);
3285 return JNI_OK;
3286 }
3287
3288 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3289
3290 FREE_C_HEAP_ARRAY(char, buf);
3291 return retcode;
3292 }
3293
3294 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3295 // Construct option array
3296 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3297
3298 // some pointers to help with parsing
3299 char *buffer_end = buffer + buf_len;
3300 char *opt_hd = buffer;
3301 char *wrt = buffer;
3302 char *rd = buffer;
3303
3304 // parse all options
3305 while (rd < buffer_end) {
3306 // skip leading white space from the input string
3307 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3308 rd++;
3309 }
3310
3311 if (rd >= buffer_end) {
3312 break;
3313 }
3314
3315 // Remember this is where we found the head of the token.
3316 opt_hd = wrt;
3317
3318 // Tokens are strings of non white space characters separated
3319 // by one or more white spaces.
3320 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3321 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3322 int quote = *rd; // matching quote to look for
3323 rd++; // don't copy open quote
3324 while (rd < buffer_end && *rd != quote) {
3325 // include everything (even spaces)
3326 // up until the close quote
3327 *wrt++ = *rd++; // copy to option string
3328 }
3329
3330 if (rd < buffer_end) {
3331 rd++; // don't copy close quote
3332 } else {
3333 // did not see closing quote
3334 jio_fprintf(defaultStream::error_stream(),
3335 "Unmatched quote in %s\n", name);
3336 return JNI_ERR;
3337 }
3338 } else {
3339 *wrt++ = *rd++; // copy to option string
3340 }
3341 }
3342
3343 // steal a white space character and set it to null
3344 *wrt++ = '\0';
3345 // We now have a complete token
3346
3347 JavaVMOption option;
3348 option.optionString = opt_hd;
3349 option.extraInfo = nullptr;
3350
3351 options.append(option); // Fill in option
3352
3353 rd++; // Advance to next character
3354 }
3355
3356 // Fill out JavaVMInitArgs structure.
3357 return vm_args->set_args(&options);
3358 }
3359
3360 #ifndef PRODUCT
3361 // Determine whether LogVMOutput should be implicitly turned on.
3362 static bool use_vm_log() {
3363 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3364 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3365 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3366 PrintAssembly || TraceDeoptimization ||
3367 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3368 return true;
3369 }
3370
3371 #ifdef COMPILER1
3372 if (PrintC1Statistics) {
3373 return true;
3374 }
3375 #endif // COMPILER1
3376
3377 #ifdef COMPILER2
3378 if (PrintOptoAssembly || PrintOptoStatistics) {
3379 return true;
3380 }
3381 #endif // COMPILER2
3382
3383 return false;
3384 }
3385
3386 #endif // PRODUCT
3387
3388 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3389 for (int index = 0; index < args->nOptions; index++) {
3390 const JavaVMOption* option = args->options + index;
3391 const char* tail;
3392 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3393 return true;
3394 }
3395 }
3396 return false;
3397 }
3398
3399 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3400 const char* vm_options_file,
3401 const int vm_options_file_pos,
3402 ScopedVMInitArgs* vm_options_file_args,
3403 ScopedVMInitArgs* args_out) {
3404 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3405 if (code != JNI_OK) {
3406 return code;
3407 }
3408
3409 if (vm_options_file_args->get()->nOptions < 1) {
3410 return JNI_OK;
3411 }
3412
3413 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3414 jio_fprintf(defaultStream::error_stream(),
3415 "A VM options file may not refer to a VM options file. "
3416 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3417 "options file '%s' in options container '%s' is an error.\n",
3418 vm_options_file_args->vm_options_file_arg(),
3419 vm_options_file_args->container_name());
3420 return JNI_EINVAL;
3421 }
3422
3423 return args_out->insert(args, vm_options_file_args->get(),
3424 vm_options_file_pos);
3425 }
3426
3427 // Expand -XX:VMOptionsFile found in args_in as needed.
3428 // mod_args and args_out parameters may return values as needed.
3429 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3430 ScopedVMInitArgs* mod_args,
3431 JavaVMInitArgs** args_out) {
3432 jint code = match_special_option_and_act(args_in, mod_args);
3433 if (code != JNI_OK) {
3434 return code;
3435 }
3436
3437 if (mod_args->is_set()) {
3438 // args_in contains -XX:VMOptionsFile and mod_args contains the
3439 // original options from args_in along with the options expanded
3440 // from the VMOptionsFile. Return a short-hand to the caller.
3441 *args_out = mod_args->get();
3442 } else {
3443 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3444 }
3445 return JNI_OK;
3446 }
3447
3448 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3449 ScopedVMInitArgs* args_out) {
3450 // Remaining part of option string
3451 const char* tail;
3452 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3453
3454 for (int index = 0; index < args->nOptions; index++) {
3455 const JavaVMOption* option = args->options + index;
3456 if (match_option(option, "-XX:Flags=", &tail)) {
3457 Arguments::set_jvm_flags_file(tail);
3458 continue;
3459 }
3460 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3461 if (vm_options_file_args.found_vm_options_file_arg()) {
3462 jio_fprintf(defaultStream::error_stream(),
3463 "The option '%s' is already specified in the options "
3464 "container '%s' so the specification of '%s' in the "
3465 "same options container is an error.\n",
3466 vm_options_file_args.vm_options_file_arg(),
3467 vm_options_file_args.container_name(),
3468 option->optionString);
3469 return JNI_EINVAL;
3470 }
3471 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3472 // If there's a VMOptionsFile, parse that
3473 jint code = insert_vm_options_file(args, tail, index,
3474 &vm_options_file_args, args_out);
3475 if (code != JNI_OK) {
3476 return code;
3477 }
3478 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3479 if (args_out->is_set()) {
3480 // The VMOptions file inserted some options so switch 'args'
3481 // to the new set of options, and continue processing which
3482 // preserves "last option wins" semantics.
3483 args = args_out->get();
3484 // The first option from the VMOptionsFile replaces the
3485 // current option. So we back track to process the
3486 // replacement option.
3487 index--;
3488 }
3489 continue;
3490 }
3491 if (match_option(option, "-XX:+PrintVMOptions")) {
3492 PrintVMOptions = true;
3493 continue;
3494 }
3495 if (match_option(option, "-XX:-PrintVMOptions")) {
3496 PrintVMOptions = false;
3497 continue;
3498 }
3499 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3500 IgnoreUnrecognizedVMOptions = true;
3501 continue;
3502 }
3503 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3504 IgnoreUnrecognizedVMOptions = false;
3505 continue;
3506 }
3507 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3508 JVMFlag::printFlags(tty, false);
3509 vm_exit(0);
3510 }
3511
3512 #ifndef PRODUCT
3513 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3514 JVMFlag::printFlags(tty, true);
3515 vm_exit(0);
3516 }
3517 #endif
3518 }
3519 return JNI_OK;
3520 }
3521
3522 static void print_options(const JavaVMInitArgs *args) {
3523 const char* tail;
3524 for (int index = 0; index < args->nOptions; index++) {
3525 const JavaVMOption *option = args->options + index;
3526 if (match_option(option, "-XX:", &tail)) {
3527 logOption(tail);
3528 }
3529 }
3530 }
3531
3532 bool Arguments::handle_deprecated_print_gc_flags() {
3533 if (PrintGC) {
3534 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3535 }
3536 if (PrintGCDetails) {
3537 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3538 }
3539
3540 if (_legacyGCLogging.lastFlag == 2) {
3541 // -Xloggc was used to specify a filename
3542 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3543
3544 LogTarget(Error, logging) target;
3545 LogStream errstream(target);
3546 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3547 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3548 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3549 }
3550 return true;
3551 }
3552
3553 static void apply_debugger_ergo() {
3554 #ifdef ASSERT
3555 if (ReplayCompiles) {
3556 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3557 }
3558
3559 if (UseDebuggerErgo) {
3560 // Turn on sub-flags
3561 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3562 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3563 }
3564
3565 if (UseDebuggerErgo2) {
3566 // Debugging with limited number of CPUs
3567 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3568 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3569 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3570 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3571 }
3572 #endif // ASSERT
3573 }
3574
3575 // Parse entry point called from JNI_CreateJavaVM
3576
3577 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3578 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3579 JVMFlag::check_all_flag_declarations();
3580
3581 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3582 const char* hotspotrc = ".hotspotrc";
3583 bool settings_file_specified = false;
3584 bool needs_hotspotrc_warning = false;
3585 ScopedVMInitArgs initial_vm_options_args("");
3586 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3587 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3588 ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'");
3589
3590 // Pointers to current working set of containers
3591 JavaVMInitArgs* cur_cmd_args;
3592 JavaVMInitArgs* cur_vm_options_args;
3593 JavaVMInitArgs* cur_java_options_args;
3594 JavaVMInitArgs* cur_java_tool_options_args;
3595 JavaVMInitArgs* cur_jdk_aot_vm_options_args;
3596
3597 // Containers for modified/expanded options
3598 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3599 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3600 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3601 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3602 ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'");
3603
3604 GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args;
3605
3606 jint code =
3607 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3608 if (code != JNI_OK) {
3609 return code;
3610 }
3611
3612 // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM.
3613 // This is an undocumented feature.
3614 code = parse_java_options_environment_variable(&initial_java_options_args);
3615 if (code != JNI_OK) {
3616 return code;
3617 }
3618
3619 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3620 char *vmoptions = ClassLoader::lookup_vm_options();
3621 if (vmoptions != nullptr) {
3622 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3623 FREE_C_HEAP_ARRAY(char, vmoptions);
3624 if (code != JNI_OK) {
3625 return code;
3626 }
3627 }
3628
3629 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3630 &mod_java_tool_options_args,
3631 &cur_java_tool_options_args);
3632 if (code != JNI_OK) {
3633 return code;
3634 }
3635
3636 code = expand_vm_options_as_needed(initial_cmd_args,
3637 &mod_cmd_args,
3638 &cur_cmd_args);
3639 if (code != JNI_OK) {
3640 return code;
3641 }
3642
3643 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3644 &mod_java_options_args,
3645 &cur_java_options_args);
3646 if (code != JNI_OK) {
3647 return code;
3648 }
3649
3650 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3651 &mod_vm_options_args,
3652 &cur_vm_options_args);
3653 if (code != JNI_OK) {
3654 return code;
3655 }
3656
3657 const char* flags_file = Arguments::get_jvm_flags_file();
3658 settings_file_specified = (flags_file != nullptr);
3659
3660 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags.
3661 if (settings_file_specified) {
3662 if (!process_settings_file(flags_file, true,
3663 IgnoreUnrecognizedVMOptions)) {
3664 return JNI_EINVAL;
3665 }
3666 } else {
3667 #ifdef ASSERT
3668 // Parse default .hotspotrc settings file
3669 if (!process_settings_file(".hotspotrc", false,
3670 IgnoreUnrecognizedVMOptions)) {
3671 return JNI_EINVAL;
3672 }
3673 #else
3674 struct stat buf;
3675 if (os::stat(hotspotrc, &buf) == 0) {
3676 needs_hotspotrc_warning = true;
3677 }
3678 #endif
3679 }
3680
3681 // The settings in the args are applied in this order to the the JVM global flags.
3682 // For historical reasons, the order is DIFFERENT than the scanning order of
3683 // the above expand_vm_options_as_needed() calls.
3684 all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE});
3685 all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR});
3686 all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE});
3687 all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR});
3688
3689 // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all
3690 // the options that have been gathered above.
3691 code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args);
3692 if (code != JNI_OK) {
3693 return code;
3694 }
3695 code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(),
3696 &mod_jdk_aot_vm_options_args,
3697 &cur_jdk_aot_vm_options_args);
3698 if (code != JNI_OK) {
3699 return code;
3700 }
3701
3702 for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) {
3703 JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index;
3704 const char* optionString = option->optionString;
3705 if (strstr(optionString, "-XX:AOTMode=") == optionString &&
3706 strcmp(optionString, "-XX:AOTMode=create") != 0) {
3707 jio_fprintf(defaultStream::error_stream(),
3708 "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString);
3709 return JNI_ERR;
3710 }
3711 }
3712
3713 all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR});
3714
3715 if (IgnoreUnrecognizedVMOptions) {
3716 // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of
3717 // the JDK so it shouldn't have bad options.
3718 cur_cmd_args->ignoreUnrecognized = true;
3719 cur_java_tool_options_args->ignoreUnrecognized = true;
3720 cur_java_options_args->ignoreUnrecognized = true;
3721 cur_jdk_aot_vm_options_args->ignoreUnrecognized = true;
3722 }
3723
3724 if (PrintVMOptions) {
3725 // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed.
3726 print_options(cur_java_tool_options_args);
3727 print_options(cur_cmd_args);
3728 print_options(cur_java_options_args);
3729 print_options(cur_jdk_aot_vm_options_args);
3730 }
3731
3732 // Apply the settings in these args to the JVM global flags.
3733 jint result = parse_vm_init_args(&all_args);
3734
3735 if (result != JNI_OK) {
3736 return result;
3737 }
3738
3739 // Delay warning until here so that we've had a chance to process
3740 // the -XX:-PrintWarnings flag
3741 if (needs_hotspotrc_warning) {
3742 warning("%s file is present but has been ignored. "
3743 "Run with -XX:Flags=%s to load the file.",
3744 hotspotrc, hotspotrc);
3745 }
3746
3747 if (needs_module_property_warning) {
3748 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3749 " names that are reserved for internal use.");
3750 }
3751
3752 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3753 UNSUPPORTED_OPTION(UseLargePages);
3754 #endif
3755
3756 #if defined(AIX)
3757 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3758 #endif
3759
3760 #ifndef PRODUCT
3761 if (TraceBytecodesAt != 0) {
3762 TraceBytecodes = true;
3763 }
3764 #endif // PRODUCT
3765
3766 if (ScavengeRootsInCode == 0) {
3767 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3768 warning("Forcing ScavengeRootsInCode non-zero");
3769 }
3770 ScavengeRootsInCode = 1;
3771 }
3772
3773 if (!handle_deprecated_print_gc_flags()) {
3774 return JNI_EINVAL;
3775 }
3776
3777 // Set object alignment values.
3778 set_object_alignment();
3779
3780 #if !INCLUDE_CDS
3781 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3782 jio_fprintf(defaultStream::error_stream(),
3783 "Shared spaces are not supported in this VM\n");
3784 return JNI_ERR;
3785 }
3786 if (DumpLoadedClassList != nullptr) {
3787 jio_fprintf(defaultStream::error_stream(),
3788 "DumpLoadedClassList is not supported in this VM\n");
3789 return JNI_ERR;
3790 }
3791 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3792 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) {
3793 warning("Shared spaces are not supported in this VM");
3794 UseSharedSpaces = false;
3795 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3796 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot));
3797 }
3798 no_shared_spaces("CDS Disabled");
3799 #endif // INCLUDE_CDS
3800
3801 // Verify NMT arguments
3802 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3803 if (lvl == NMT_unknown) {
3804 jio_fprintf(defaultStream::error_stream(),
3805 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3806 return JNI_ERR;
3807 }
3808 if (PrintNMTStatistics && lvl == NMT_off) {
3809 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3810 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3811 }
3812
3813 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3814 if (trace_dependencies && VerifyDependencies) {
3815 warning("dependency logging results may be inflated by VerifyDependencies");
3816 }
3817
3818 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3819 log_is_enabled(Info, class, load, cause);
3820 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3821 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3822 }
3823
3824 apply_debugger_ergo();
3825
3826 // The VMThread needs to stop now and then to execute these debug options.
3827 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3828 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3829 }
3830
3831 if (log_is_enabled(Info, arguments)) {
3832 LogStream st(Log(arguments)::info());
3833 Arguments::print_on(&st);
3834 }
3835
3836 return JNI_OK;
3837 }
3838
3839 void Arguments::set_compact_headers_flags() {
3840 #ifdef _LP64
3841 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3842 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3843 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3844 }
3845 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3846 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3847 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3848 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3849
3850 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3851 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3852 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3853 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3854 } else {
3855 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3856 }
3857 }
3858 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3859 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3860 }
3861 #endif
3862 }
3863
3864 jint Arguments::apply_ergo() {
3865 // Set flags based on ergonomics.
3866 jint result = set_ergonomics_flags();
3867 if (result != JNI_OK) return result;
3868
3869 // Set heap size based on available physical memory
3870 set_heap_size();
3871
3872 GCConfig::arguments()->initialize();
3873
3874 set_compact_headers_flags();
3875
3876 if (UseCompressedClassPointers) {
3877 CompressedKlassPointers::pre_initialize();
3878 }
3879
3880 CDSConfig::ergo_initialize();
3881
3882 // Initialize Metaspace flags and alignments
3883 Metaspace::ergo_initialize();
3884
3885 if (!StringDedup::ergo_initialize()) {
3886 return JNI_EINVAL;
3887 }
3888
3889 // Set compiler flags after GC is selected and GC specific
3890 // flags (LoopStripMiningIter) are set.
3891 CompilerConfig::ergo_initialize();
3892
3893 // Set bytecode rewriting flags
3894 set_bytecode_flags();
3895
3896 // Set flags if aggressive optimization flags are enabled
3897 jint code = set_aggressive_opts_flags();
3898 if (code != JNI_OK) {
3899 return code;
3900 }
3901
3902 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3903 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3904 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3905 warning("UseSecondarySupersTable is not supported");
3906 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3907 }
3908 if (!UseSecondarySupersTable) {
3909 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3910 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3911 }
3912
3913 #ifdef ZERO
3914 // Clear flags not supported on zero.
3915 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3916 #endif // ZERO
3917
3918 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3919 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3920 DebugNonSafepoints = true;
3921 }
3922
3923 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3924 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3925 }
3926
3927 // Treat the odd case where local verification is enabled but remote
3928 // verification is not as if both were enabled.
3929 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3930 log_info(verification)("Turning on remote verification because local verification is on");
3931 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3932 }
3933 if (!EnableValhalla || (is_interpreter_only() && !CDSConfig::is_dumping_archive() && !UseSharedSpaces)) {
3934 // Disable calling convention optimizations if inline types are not supported.
3935 // Also these aren't useful in -Xint. However, don't disable them when dumping or using
3936 // the CDS archive, as the values must match between dumptime and runtime.
3937 FLAG_SET_DEFAULT(InlineTypePassFieldsAsArgs, false);
3938 FLAG_SET_DEFAULT(InlineTypeReturnedAsFields, false);
3939 }
3940 if (!UseNonAtomicValueFlattening && !UseNullableValueFlattening && !UseAtomicValueFlattening) {
3941 // Flattening is disabled
3942 FLAG_SET_DEFAULT(UseArrayFlattening, false);
3943 FLAG_SET_DEFAULT(UseFieldFlattening, false);
3944 }
3945
3946 #ifndef PRODUCT
3947 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3948 if (use_vm_log()) {
3949 LogVMOutput = true;
3950 }
3951 }
3952 #endif // PRODUCT
3953
3954 if (PrintCommandLineFlags) {
3955 JVMFlag::printSetFlags(tty);
3956 }
3957
3958 #if COMPILER2_OR_JVMCI
3959 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3960 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3961 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3962 }
3963 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3964
3965 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3966 if (!EnableVectorReboxing) {
3967 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3968 } else {
3969 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3970 }
3971 }
3972 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3973 }
3974 #endif // COMPILER2_OR_JVMCI
3975
3976 #ifdef COMPILER2
3977 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
3978 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
3979 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
3980 }
3981 #endif // COMPILER2
3982
3983 if (log_is_enabled(Info, perf, class, link)) {
3984 if (!UsePerfData) {
3985 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3986 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
3987 assert(!log_is_enabled(Info, perf, class, link), "sanity");
3988 }
3989 }
3990
3991 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3992 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3993 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3994 }
3995 }
3996 return JNI_OK;
3997 }
3998
3999 jint Arguments::adjust_after_os() {
4000 if (UseNUMA) {
4001 if (UseParallelGC) {
4002 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4003 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4004 }
4005 }
4006 }
4007 return JNI_OK;
4008 }
4009
4010 int Arguments::PropertyList_count(SystemProperty* pl) {
4011 int count = 0;
4012 while(pl != nullptr) {
4013 count++;
4014 pl = pl->next();
4015 }
4016 return count;
4017 }
4018
4019 // Return the number of readable properties.
4020 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4021 int count = 0;
4022 while(pl != nullptr) {
4023 if (pl->readable()) {
4024 count++;
4025 }
4026 pl = pl->next();
4027 }
4028 return count;
4029 }
4030
4031 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4032 assert(key != nullptr, "just checking");
4033 SystemProperty* prop;
4034 for (prop = pl; prop != nullptr; prop = prop->next()) {
4035 if (strcmp(key, prop->key()) == 0) return prop->value();
4036 }
4037 return nullptr;
4038 }
4039
4040 // Return the value of the requested property provided that it is a readable property.
4041 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4042 assert(key != nullptr, "just checking");
4043 SystemProperty* prop;
4044 // Return the property value if the keys match and the property is not internal or
4045 // it's the special internal property "jdk.boot.class.path.append".
4046 for (prop = pl; prop != nullptr; prop = prop->next()) {
4047 if (strcmp(key, prop->key()) == 0) {
4048 if (!prop->internal()) {
4049 return prop->value();
4050 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4051 return prop->value();
4052 } else {
4053 // Property is internal and not jdk.boot.class.path.append so return null.
4054 return nullptr;
4055 }
4056 }
4057 }
4058 return nullptr;
4059 }
4060
4061 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4062 SystemProperty* p = *plist;
4063 if (p == nullptr) {
4064 *plist = new_p;
4065 } else {
4066 while (p->next() != nullptr) {
4067 p = p->next();
4068 }
4069 p->set_next(new_p);
4070 }
4071 }
4072
4073 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4074 bool writeable, bool internal) {
4075 if (plist == nullptr)
4076 return;
4077
4078 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4079 PropertyList_add(plist, new_p);
4080 }
4081
4082 void Arguments::PropertyList_add(SystemProperty *element) {
4083 PropertyList_add(&_system_properties, element);
4084 }
4085
4086 // This add maintains unique property key in the list.
4087 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4088 PropertyAppendable append, PropertyWriteable writeable,
4089 PropertyInternal internal) {
4090 if (plist == nullptr)
4091 return;
4092
4093 // If property key exists and is writeable, then update with new value.
4094 // Trying to update a non-writeable property is silently ignored.
4095 SystemProperty* prop;
4096 for (prop = *plist; prop != nullptr; prop = prop->next()) {
4097 if (strcmp(k, prop->key()) == 0) {
4098 if (append == AppendProperty) {
4099 prop->append_writeable_value(v);
4100 } else {
4101 prop->set_writeable_value(v);
4102 }
4103 return;
4104 }
4105 }
4106
4107 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4108 }
4109
4110 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4111 // Returns true if all of the source pointed by src has been copied over to
4112 // the destination buffer pointed by buf. Otherwise, returns false.
4113 // Notes:
4114 // 1. If the length (buflen) of the destination buffer excluding the
4115 // null terminator character is not long enough for holding the expanded
4116 // pid characters, it also returns false instead of returning the partially
4117 // expanded one.
4118 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4119 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4120 char* buf, size_t buflen) {
4121 const char* p = src;
4122 char* b = buf;
4123 const char* src_end = &src[srclen];
4124 char* buf_end = &buf[buflen - 1];
4125
4126 while (p < src_end && b < buf_end) {
4127 if (*p == '%') {
4128 switch (*(++p)) {
4129 case '%': // "%%" ==> "%"
4130 *b++ = *p++;
4131 break;
4132 case 'p': { // "%p" ==> current process id
4133 // buf_end points to the character before the last character so
4134 // that we could write '\0' to the end of the buffer.
4135 size_t buf_sz = buf_end - b + 1;
4136 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4137
4138 // if jio_snprintf fails or the buffer is not long enough to hold
4139 // the expanded pid, returns false.
4140 if (ret < 0 || ret >= (int)buf_sz) {
4141 return false;
4142 } else {
4143 b += ret;
4144 assert(*b == '\0', "fail in copy_expand_pid");
4145 if (p == src_end && b == buf_end + 1) {
4146 // reach the end of the buffer.
4147 return true;
4148 }
4149 }
4150 p++;
4151 break;
4152 }
4153 default :
4154 *b++ = '%';
4155 }
4156 } else {
4157 *b++ = *p++;
4158 }
4159 }
4160 *b = '\0';
4161 return (p == src_end); // return false if not all of the source was copied
4162 }