1 /*
2 * Copyright (c) 1997, 2026, 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 "cppstdlib/limits.hpp"
35 #include "gc/shared/gc_globals.hpp"
36 #include "gc/shared/gcArguments.hpp"
37 #include "gc/shared/gcConfig.hpp"
38 #include "gc/shared/genArguments.hpp"
39 #include "gc/shared/stringdedup/stringDedup.hpp"
40 #include "gc/shared/tlab_globals.hpp"
41 #include "jvm.h"
42 #include "logging/log.hpp"
43 #include "logging/logConfiguration.hpp"
44 #include "logging/logStream.hpp"
45 #include "logging/logTag.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "nmt/nmtCommon.hpp"
48 #include "oops/compressedKlass.hpp"
49 #include "oops/instanceKlass.hpp"
50 #include "oops/objLayout.hpp"
51 #include "oops/oop.inline.hpp"
52 #include "prims/jvmtiAgentList.hpp"
53 #include "prims/jvmtiExport.hpp"
54 #include "runtime/arguments.hpp"
55 #include "runtime/flags/jvmFlag.hpp"
56 #include "runtime/flags/jvmFlagAccess.hpp"
57 #include "runtime/flags/jvmFlagLimit.hpp"
58 #include "runtime/globals_extension.hpp"
59 #include "runtime/java.hpp"
60 #include "runtime/os.hpp"
61 #include "runtime/safepoint.hpp"
62 #include "runtime/safepointMechanism.hpp"
63 #include "runtime/synchronizer.hpp"
64 #include "runtime/vm_version.hpp"
65 #include "services/management.hpp"
66 #include "utilities/align.hpp"
67 #include "utilities/debug.hpp"
68 #include "utilities/defaultStream.hpp"
69 #include "utilities/macros.hpp"
70 #include "utilities/parseInteger.hpp"
71 #include "utilities/powerOfTwo.hpp"
72 #include "utilities/stringUtils.hpp"
73 #include "utilities/systemMemoryBarrier.hpp"
74 #if INCLUDE_JFR
75 #include "jfr/jfr.hpp"
76 #endif
77
78 static const char _default_java_launcher[] = "generic";
79
80 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
81
82 char* Arguments::_jvm_flags_file = nullptr;
83 char** Arguments::_jvm_flags_array = nullptr;
84 int Arguments::_num_jvm_flags = 0;
85 char** Arguments::_jvm_args_array = nullptr;
86 int Arguments::_num_jvm_args = 0;
87 unsigned int Arguments::_addmods_count = 0;
88 #if INCLUDE_JVMCI
89 bool Arguments::_jvmci_module_added = false;
90 #endif
91 char* Arguments::_java_command = nullptr;
92 SystemProperty* Arguments::_system_properties = nullptr;
93 size_t Arguments::_conservative_max_heap_alignment = 0;
94 Arguments::Mode Arguments::_mode = _mixed;
95 const char* Arguments::_java_vendor_url_bug = nullptr;
96 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
97 bool Arguments::_executing_unit_tests = false;
98
99 // These parameters are reset in method parse_vm_init_args()
100 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
101 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
102 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
103 bool Arguments::_ClipInlining = ClipInlining;
104 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
105
106 bool Arguments::_enable_preview = false;
107 bool Arguments::_has_jdwp_agent = false;
108
109 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };
110
111 // These are not set by the JDK's built-in launchers, but they can be set by
112 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
113 // JavaVMOption in jni.h.
114 abort_hook_t Arguments::_abort_hook = nullptr;
115 exit_hook_t Arguments::_exit_hook = nullptr;
116 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
117
118
119 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
120 SystemProperty *Arguments::_java_library_path = nullptr;
121 SystemProperty *Arguments::_java_home = nullptr;
122 SystemProperty *Arguments::_java_class_path = nullptr;
123 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
124 SystemProperty *Arguments::_vm_info = nullptr;
125
126 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
127 PathString *Arguments::_boot_class_path = nullptr;
128 bool Arguments::_has_jimage = false;
129
130 char* Arguments::_ext_dirs = nullptr;
131
132 // True if -Xshare:auto option was specified.
133 static bool xshare_auto_cmd_line = false;
134
135 // True if -Xint/-Xmixed/-Xcomp were specified
136 static bool mode_flag_cmd_line = false;
137
138 struct VMInitArgsGroup {
139 const JavaVMInitArgs* _args;
140 JVMFlagOrigin _origin;
141 };
142
143 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
144 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
145 if (new_value == nullptr) {
146 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
147 return false;
148 }
149 if (_value != nullptr) {
150 FreeHeap(_value);
151 }
152 _value = new_value;
153 strcpy(_value, value);
154 return true;
155 }
156
157 void PathString::append_value(const char *value) {
158 char *sp;
159 size_t len = 0;
160 if (value != nullptr) {
161 len = strlen(value);
162 if (_value != nullptr) {
163 len += strlen(_value);
164 }
165 sp = AllocateHeap(len+2, mtArguments);
166 assert(sp != nullptr, "Unable to allocate space for new append path value");
167 if (sp != nullptr) {
168 if (_value != nullptr) {
169 strcpy(sp, _value);
170 strcat(sp, os::path_separator());
171 strcat(sp, value);
172 FreeHeap(_value);
173 } else {
174 strcpy(sp, value);
175 }
176 _value = sp;
177 }
178 }
179 }
180
181 PathString::PathString(const char* value) {
182 if (value == nullptr) {
183 _value = nullptr;
184 } else {
185 _value = AllocateHeap(strlen(value)+1, mtArguments);
186 strcpy(_value, value);
187 }
188 }
189
190 PathString::~PathString() {
191 if (_value != nullptr) {
192 FreeHeap(_value);
193 _value = nullptr;
194 }
195 }
196
197 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
198 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
199 size_t len = strlen(module_name) + 1;
200 _module_name = AllocateHeap(len, mtInternal);
201 strncpy(_module_name, module_name, len); // copy the trailing null
202 _path = new PathString(path);
203 }
204
205 ModulePatchPath::~ModulePatchPath() {
206 if (_module_name != nullptr) {
207 FreeHeap(_module_name);
208 _module_name = nullptr;
209 }
210 if (_path != nullptr) {
211 delete _path;
212 _path = nullptr;
213 }
214 }
215
216 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
217 if (key == nullptr) {
218 _key = nullptr;
219 } else {
220 _key = AllocateHeap(strlen(key)+1, mtArguments);
221 strcpy(_key, key);
222 }
223 _next = nullptr;
224 _internal = internal;
225 _writeable = writeable;
226 }
227
228 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
229 // part of the option string.
230 static bool match_option(const JavaVMOption *option, const char* name,
231 const char** tail) {
232 size_t len = strlen(name);
233 if (strncmp(option->optionString, name, len) == 0) {
234 *tail = option->optionString + len;
235 return true;
236 } else {
237 return false;
238 }
239 }
240
241 // Check if 'option' matches 'name'. No "tail" is allowed.
242 static bool match_option(const JavaVMOption *option, const char* name) {
243 const char* tail = nullptr;
244 bool result = match_option(option, name, &tail);
245 if (tail != nullptr && *tail == '\0') {
246 return result;
247 } else {
248 return false;
249 }
250 }
251
252 // Return true if any of the strings in null-terminated array 'names' matches.
253 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
254 // the option must match exactly.
255 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
256 bool tail_allowed) {
257 for (/* empty */; *names != nullptr; ++names) {
258 if (match_option(option, *names, tail)) {
259 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
260 return true;
261 }
262 }
263 }
264 return false;
265 }
266
267 #if INCLUDE_JFR
268 static bool _has_jfr_option = false; // is using JFR
269
270 // return true on failure
271 static bool match_jfr_option(const JavaVMOption** option) {
272 assert((*option)->optionString != nullptr, "invariant");
273 char* tail = nullptr;
274 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
275 _has_jfr_option = true;
276 return Jfr::on_start_flight_recording_option(option, tail);
277 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
278 _has_jfr_option = true;
279 return Jfr::on_flight_recorder_option(option, tail);
280 }
281 return false;
282 }
283
284 bool Arguments::has_jfr_option() {
285 return _has_jfr_option;
286 }
287 #endif
288
289 static void logOption(const char* opt) {
290 if (PrintVMOptions) {
291 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
292 }
293 }
294
295 bool needs_module_property_warning = false;
296
297 #define MODULE_PROPERTY_PREFIX "jdk.module."
298 #define MODULE_PROPERTY_PREFIX_LEN 11
299 #define ADDEXPORTS "addexports"
300 #define ADDEXPORTS_LEN 10
301 #define ADDREADS "addreads"
302 #define ADDREADS_LEN 8
303 #define ADDOPENS "addopens"
304 #define ADDOPENS_LEN 8
305 #define PATCH "patch"
306 #define PATCH_LEN 5
307 #define ADDMODS "addmods"
308 #define ADDMODS_LEN 7
309 #define LIMITMODS "limitmods"
310 #define LIMITMODS_LEN 9
311 #define PATH "path"
312 #define PATH_LEN 4
313 #define UPGRADE_PATH "upgrade.path"
314 #define UPGRADE_PATH_LEN 12
315 #define ENABLE_NATIVE_ACCESS "enable.native.access"
316 #define ENABLE_NATIVE_ACCESS_LEN 20
317 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
318 #define ILLEGAL_NATIVE_ACCESS_LEN 21
319 #define ENABLE_FINAL_FIELD_MUTATION "enable.final.field.mutation"
320 #define ENABLE_FINAL_FIELD_MUTATION_LEN 27
321 #define ILLEGAL_FINAL_FIELD_MUTATION "illegal.final.field.mutation"
322 #define ILLEGAL_FINAL_FIELD_MUTATION_LEN 28
323
324 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
325 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
326 return ((strncmp(option, property, len) == 0) &&
327 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
328 }
329
330 // Return true if property starts with "jdk.module." and its ensuing chars match
331 // any of the reserved module properties.
332 // property should be passed without the leading "-D".
333 bool Arguments::is_internal_module_property(const char* property) {
334 return internal_module_property_helper(property, false);
335 }
336
337 // Returns true if property is one of those recognized by is_internal_module_property() but
338 // is not supported by CDS archived full module graph.
339 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
340 return internal_module_property_helper(property, true);
341 }
342
343 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
344 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
345 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
346 if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
347 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
348 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
349 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN) ||
350 matches_property_suffix(property_suffix, ENABLE_FINAL_FIELD_MUTATION, ENABLE_FINAL_FIELD_MUTATION_LEN) ||
351 matches_property_suffix(property_suffix, ILLEGAL_FINAL_FIELD_MUTATION, ILLEGAL_FINAL_FIELD_MUTATION_LEN)) {
352 return true;
353 }
354
355 if (!check_for_cds) {
356 // CDS notes: these properties are supported by CDS archived full module graph.
357 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
358 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
359 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
360 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
361 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
362 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
363 return true;
364 }
365 }
366 }
367 return false;
368 }
369
370 // Process java launcher properties.
371 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
372 // See if sun.java.launcher is defined.
373 // Must do this before setting up other system properties,
374 // as some of them may depend on launcher type.
375 for (int index = 0; index < args->nOptions; index++) {
376 const JavaVMOption* option = args->options + index;
377 const char* tail;
378
379 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
380 process_java_launcher_argument(tail, option->extraInfo);
381 continue;
382 }
383 if (match_option(option, "-XX:+ExecutingUnitTests")) {
384 _executing_unit_tests = true;
385 continue;
386 }
387 }
388 }
389
390 // Initialize system properties key and value.
391 void Arguments::init_system_properties() {
392
393 // Set up _boot_class_path which is not a property but
394 // relies heavily on argument processing and the jdk.boot.class.path.append
395 // property. It is used to store the underlying boot class path.
396 _boot_class_path = new PathString(nullptr);
397
398 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
399 "Java Virtual Machine Specification", false));
400 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
401 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
402 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
403
404 // Initialize the vm.info now, but it will need updating after argument parsing.
405 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
406
407 // Following are JVMTI agent writable properties.
408 // Properties values are set to nullptr and they are
409 // os specific they are initialized in os::init_system_properties_values().
410 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);
411 _java_library_path = new SystemProperty("java.library.path", nullptr, true);
412 _java_home = new SystemProperty("java.home", nullptr, true);
413 _java_class_path = new SystemProperty("java.class.path", "", true);
414 // jdk.boot.class.path.append is a non-writeable, internal property.
415 // It can only be set by either:
416 // - -Xbootclasspath/a:
417 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
418 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
419
420 // Add to System Property list.
421 PropertyList_add(&_system_properties, _sun_boot_library_path);
422 PropertyList_add(&_system_properties, _java_library_path);
423 PropertyList_add(&_system_properties, _java_home);
424 PropertyList_add(&_system_properties, _java_class_path);
425 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
426 PropertyList_add(&_system_properties, _vm_info);
427
428 // Set OS specific system properties values
429 os::init_system_properties_values();
430 }
431
432 // Update/Initialize System properties after JDK version number is known
433 void Arguments::init_version_specific_system_properties() {
434 enum { bufsz = 16 };
435 char buffer[bufsz];
436 const char* spec_vendor = "Oracle Corporation";
437 uint32_t spec_version = JDK_Version::current().major_version();
438
439 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
440
441 PropertyList_add(&_system_properties,
442 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
443 PropertyList_add(&_system_properties,
444 new SystemProperty("java.vm.specification.version", buffer, false));
445 PropertyList_add(&_system_properties,
446 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
447 }
448
449 /*
450 * -XX argument processing:
451 *
452 * -XX arguments are defined in several places, such as:
453 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
454 * -XX arguments are parsed in parse_argument().
455 * -XX argument bounds checking is done in check_vm_args_consistency().
456 *
457 * Over time -XX arguments may change. There are mechanisms to handle common cases:
458 *
459 * ALIASED: An option that is simply another name for another option. This is often
460 * part of the process of deprecating a flag, but not all aliases need
461 * to be deprecated.
462 *
463 * Create an alias for an option by adding the old and new option names to the
464 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
465 *
466 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
467 * support may be removed in the future. Both regular and aliased options may be
468 * deprecated.
469 *
470 * Add a deprecation warning for an option (or alias) by adding an entry in the
471 * "special_jvm_flags" table and setting the "deprecated_in" field.
472 * Often an option "deprecated" in one major release will
473 * be made "obsolete" in the next. In this case the entry should also have its
474 * "obsolete_in" field set.
475 *
476 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
477 * on the command line. A warning is printed to let the user know that option might not
478 * be accepted in the future.
479 *
480 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
481 * table and setting the "obsolete_in" field.
482 *
483 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
484 * to the current JDK version. The system will flatly refuse to admit the existence of
485 * the flag. This allows a flag to die automatically over JDK releases.
486 *
487 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
488 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
489 * - Newly obsolete or expired deprecated options should have their global variable
490 * definitions removed (from globals.hpp, etc) and related implementations removed.
491 *
492 * Recommended approach for removing options:
493 *
494 * To remove options commonly used by customers (e.g. product -XX options), use
495 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
496 *
497 * To remove internal options (e.g. diagnostic, experimental, develop options), use
498 * a 2-step model adding major release numbers to the obsolete and expire columns.
499 *
500 * To change the name of an option, use the alias table as well as a 2-step
501 * model adding major release numbers to the deprecate and expire columns.
502 * Think twice about aliasing commonly used customer options.
503 *
504 * There are times when it is appropriate to leave a future release number as undefined.
505 *
506 * Tests: Aliases should be tested in VMAliasOptions.java.
507 * Deprecated options should be tested in VMDeprecatedOptions.java.
508 */
509
510 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
511 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
512 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
513 // the command-line as usual, but will issue a warning.
514 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
515 // the command-line, while issuing a warning and ignoring the flag value.
516 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
517 // existence of the flag.
518 //
519 // MANUAL CLEANUP ON JDK VERSION UPDATES:
520 // This table ensures that the handling of options will update automatically when the JDK
521 // version is incremented, but the source code needs to be cleanup up manually:
522 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
523 // variable should be removed, as well as users of the variable.
524 // - As "deprecated" options age into "obsolete" options, move the entry into the
525 // "Obsolete Flags" section of the table.
526 // - All expired options should be removed from the table.
527 static SpecialFlag const special_jvm_flags[] = {
528 // -------------- Deprecated Flags --------------
529 // --- Non-alias flags - sorted by obsolete_in then expired_in:
530 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
531 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
532 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
533 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
534 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
535 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
536 #ifdef _LP64
537 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(27), JDK_Version::undefined() },
538 #endif
539 { "AggressiveHeap", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
540 { "NeverActAsServerClassMachine", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
541 { "AlwaysActAsServerClassMachine", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
542 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
543 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
544
545 // -------------- Obsolete Flags - sorted by expired_in --------------
546
547 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
548 #if defined(AARCH64)
549 { "NearCpool", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
550 #endif
551
552 { "PSChunkLargeArrays", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
553 { "ParallelRefProcEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
554 { "ParallelRefProcBalancingEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
555 { "MaxRAM", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
556
557 #ifdef ASSERT
558 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
559 #endif
560
561 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
562 // These entries will generate build errors. Their purpose is to test the macros.
563 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
564 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
565 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
566 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
567 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
568 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
569 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
570 #endif
571
572 { nullptr, JDK_Version(0), JDK_Version(0) }
573 };
574
575 // Flags that are aliases for other flags.
576 typedef struct {
577 const char* alias_name;
578 const char* real_name;
579 } AliasedFlag;
580
581 static AliasedFlag const aliased_jvm_flags[] = {
582 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
583 { nullptr, nullptr}
584 };
585
586 // Return true if "v" is less than "other", where "other" may be "undefined".
587 static bool version_less_than(JDK_Version v, JDK_Version other) {
588 assert(!v.is_undefined(), "must be defined");
589 if (!other.is_undefined() && v.compare(other) >= 0) {
590 return false;
591 } else {
592 return true;
593 }
594 }
595
596 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
597 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
598 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
599 flag = special_jvm_flags[i];
600 return true;
601 }
602 }
603 return false;
604 }
605
606 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
607 assert(version != nullptr, "Must provide a version buffer");
608 SpecialFlag flag;
609 if (lookup_special_flag(flag_name, flag)) {
610 if (!flag.obsolete_in.is_undefined()) {
611 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
612 *version = flag.obsolete_in;
613 // This flag may have been marked for obsoletion in this version, but we may not
614 // have actually removed it yet. Rather than ignoring it as soon as we reach
615 // this version we allow some time for the removal to happen. So if the flag
616 // still actually exists we process it as normal, but issue an adjusted warning.
617 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
618 if (real_flag != nullptr) {
619 char version_str[256];
620 version->to_string(version_str, sizeof(version_str));
621 warning("Temporarily processing option %s; support is scheduled for removal in %s",
622 flag_name, version_str);
623 return false;
624 }
625 return true;
626 }
627 }
628 }
629 return false;
630 }
631
632 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
633 assert(version != nullptr, "Must provide a version buffer");
634 SpecialFlag flag;
635 if (lookup_special_flag(flag_name, flag)) {
636 if (!flag.deprecated_in.is_undefined()) {
637 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
638 version_less_than(JDK_Version::current(), flag.expired_in)) {
639 *version = flag.deprecated_in;
640 return 1;
641 } else {
642 return -1;
643 }
644 }
645 }
646 return 0;
647 }
648
649 const char* Arguments::real_flag_name(const char *flag_name) {
650 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
651 const AliasedFlag& flag_status = aliased_jvm_flags[i];
652 if (strcmp(flag_status.alias_name, flag_name) == 0) {
653 return flag_status.real_name;
654 }
655 }
656 return flag_name;
657 }
658
659 #ifdef ASSERT
660 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
661 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
662 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
663 return true;
664 }
665 }
666 return false;
667 }
668
669 // Verifies the correctness of the entries in the special_jvm_flags table.
670 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
671 // version being earlier than the deprecation version, then a warning is issued
672 // and verification fails - by returning false. If it is detected that the table
673 // is out of date, with respect to the current version, then ideally a warning is
674 // issued but verification does not fail. This allows the VM to operate when the
675 // version is first updated, without needing to update all the impacted flags at
676 // the same time. In practice we can't issue the warning immediately when the version
677 // is updated as it occurs for every test and some tests are not prepared to handle
678 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
679 // if the check_globals flag is true, and in addition allow a grace period and only
680 // check for stale flags when we hit build 25 (which is far enough into the 6 month
681 // release cycle that all flag updates should have been processed, whilst still
682 // leaving time to make the change before RDP2).
683 // We use a gtest to call this, passing true, so that we can detect stale flags before
684 // the end of the release cycle.
685
686 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
687
688 bool Arguments::verify_special_jvm_flags(bool check_globals) {
689 bool success = true;
690 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
691 const SpecialFlag& flag = special_jvm_flags[i];
692 if (lookup_special_flag(flag.name, i)) {
693 warning("Duplicate special flag declaration \"%s\"", flag.name);
694 success = false;
695 }
696 if (flag.deprecated_in.is_undefined() &&
697 flag.obsolete_in.is_undefined()) {
698 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
699 success = false;
700 }
701
702 if (!flag.deprecated_in.is_undefined()) {
703 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
704 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
705 success = false;
706 }
707
708 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
709 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
710 success = false;
711 }
712 }
713
714 if (!flag.obsolete_in.is_undefined()) {
715 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
716 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
717 success = false;
718 }
719
720 // if flag has become obsolete it should not have a "globals" flag defined anymore.
721 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
722 !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
723 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
724 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
725 success = false;
726 }
727 }
728
729 } else if (!flag.expired_in.is_undefined()) {
730 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
731 success = false;
732 }
733
734 if (!flag.expired_in.is_undefined()) {
735 // if flag has become expired it should not have a "globals" flag defined anymore.
736 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
737 !version_less_than(JDK_Version::current(), flag.expired_in)) {
738 if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
739 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
740 success = false;
741 }
742 }
743 }
744 }
745 return success;
746 }
747 #endif
748
749 bool Arguments::atojulong(const char *s, julong* result) {
750 return parse_integer(s, result);
751 }
752
753 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
754 if (size < min_size) return arg_too_small;
755 if (size > max_size) return arg_too_big;
756 return arg_in_range;
757 }
758
759 // Describe an argument out of range error
760 void Arguments::describe_range_error(ArgsRange errcode) {
761 switch(errcode) {
762 case arg_too_big:
763 jio_fprintf(defaultStream::error_stream(),
764 "The specified size exceeds the maximum "
765 "representable size.\n");
766 break;
767 case arg_too_small:
768 case arg_unreadable:
769 case arg_in_range:
770 // do nothing for now
771 break;
772 default:
773 ShouldNotReachHere();
774 }
775 }
776
777 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
778 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
779 return true;
780 } else {
781 return false;
782 }
783 }
784
785 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
786 // strtod allows leading whitespace, but our flag format does not.
787 if (*value == '\0' || isspace((unsigned char) *value)) {
788 return false;
789 }
790 char* end;
791 errno = 0;
792 double v = strtod(value, &end);
793 if ((errno != 0) || (*end != 0)) {
794 return false;
795 }
796 if (g_isnan(v) || !g_isfinite(v)) {
797 // Currently we cannot handle these special values.
798 return false;
799 }
800
801 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
802 return true;
803 }
804 return false;
805 }
806
807 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
808 JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
809
810 if (flag->is_int()) {
811 int v;
812 if (parse_integer(value, &v)) {
813 result = JVMFlagAccess::set_int(flag, &v, origin);
814 }
815 } else if (flag->is_uint()) {
816 uint v;
817 if (parse_integer(value, &v)) {
818 result = JVMFlagAccess::set_uint(flag, &v, origin);
819 }
820 } else if (flag->is_intx()) {
821 intx v;
822 if (parse_integer(value, &v)) {
823 result = JVMFlagAccess::set_intx(flag, &v, origin);
824 }
825 } else if (flag->is_uintx()) {
826 uintx v;
827 if (parse_integer(value, &v)) {
828 result = JVMFlagAccess::set_uintx(flag, &v, origin);
829 }
830 } else if (flag->is_uint64_t()) {
831 uint64_t v;
832 if (parse_integer(value, &v)) {
833 result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
834 }
835 } else if (flag->is_size_t()) {
836 size_t v;
837 if (parse_integer(value, &v)) {
838 result = JVMFlagAccess::set_size_t(flag, &v, origin);
839 }
840 }
841
842 return result == JVMFlag::SUCCESS;
843 }
844
845 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
846 if (value[0] == '\0') {
847 value = nullptr;
848 }
849 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
850 // Contract: JVMFlag always returns a pointer that needs freeing.
851 FREE_C_HEAP_ARRAY(char, value);
852 return true;
853 }
854
855 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
856 const char* old_value = "";
857 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
858 size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
859 size_t new_len = strlen(new_value);
860 const char* value;
861 char* free_this_too = nullptr;
862 if (old_len == 0) {
863 value = new_value;
864 } else if (new_len == 0) {
865 value = old_value;
866 } else {
867 size_t length = old_len + 1 + new_len + 1;
868 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
869 // each new setting adds another LINE to the switch:
870 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
871 value = buf;
872 free_this_too = buf;
873 }
874 (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
875 // JVMFlag always returns a pointer that needs freeing.
876 FREE_C_HEAP_ARRAY(char, value);
877 // JVMFlag made its own copy, so I must delete my own temp. buffer.
878 FREE_C_HEAP_ARRAY(char, free_this_too);
879 return true;
880 }
881
882 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
883 const char* real_name = real_flag_name(arg);
884 JDK_Version since = JDK_Version();
885 switch (is_deprecated_flag(arg, &since)) {
886 case -1: {
887 // Obsolete or expired, so don't process normally,
888 // but allow for an obsolete flag we're still
889 // temporarily allowing.
890 if (!is_obsolete_flag(arg, &since)) {
891 return real_name;
892 }
893 // Note if we're not considered obsolete then we can't be expired either
894 // as obsoletion must come first.
895 return nullptr;
896 }
897 case 0:
898 return real_name;
899 case 1: {
900 char version[256];
901 since.to_string(version, sizeof(version));
902 if (real_name != arg) {
903 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
904 arg, version, real_name);
905 } else {
906 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
907 arg, version);
908 }
909 return real_name;
910 }
911 }
912 ShouldNotReachHere();
913 return nullptr;
914 }
915
916 #define BUFLEN 255
917
918 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
919 char name_copied[BUFLEN+1];
920 if (name[name_length] != 0) {
921 if (name_length > BUFLEN) {
922 return nullptr;
923 } else {
924 strncpy(name_copied, name, name_length);
925 name_copied[name_length] = '\0';
926 name = name_copied;
927 }
928 }
929
930 const char* real_name = Arguments::handle_aliases_and_deprecation(name);
931 if (real_name == nullptr) {
932 return nullptr;
933 }
934 JVMFlag* flag = JVMFlag::find_flag(real_name);
935 return flag;
936 }
937
938 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
939 bool is_bool = false;
940 bool bool_val = false;
941 char c = *arg;
942 if (c == '+' || c == '-') {
943 is_bool = true;
944 bool_val = (c == '+');
945 arg++;
946 }
947
948 const char* name = arg;
949 while (true) {
950 c = *arg;
951 if (isalnum(c) || (c == '_')) {
952 ++arg;
953 } else {
954 break;
955 }
956 }
957
958 size_t name_len = size_t(arg - name);
959 if (name_len == 0) {
960 return false;
961 }
962
963 JVMFlag* flag = find_jvm_flag(name, name_len);
964 if (flag == nullptr) {
965 return false;
966 }
967
968 if (is_bool) {
969 if (*arg != 0) {
970 // Error -- extra characters such as -XX:+BoolFlag=123
971 return false;
972 }
973 return set_bool_flag(flag, bool_val, origin);
974 }
975
976 if (arg[0] == '=') {
977 const char* value = arg + 1;
978 if (flag->is_ccstr()) {
979 if (flag->ccstr_accumulates()) {
980 return append_to_string_flag(flag, value, origin);
981 } else {
982 return set_string_flag(flag, value, origin);
983 }
984 } else if (flag->is_double()) {
985 return set_fp_numeric_flag(flag, value, origin);
986 } else {
987 return set_numeric_flag(flag, value, origin);
988 }
989 }
990
991 if (arg[0] == ':' && arg[1] == '=') {
992 // -XX:Foo:=xxx will reset the string flag to the given value.
993 const char* value = arg + 2;
994 return set_string_flag(flag, value, origin);
995 }
996
997 return false;
998 }
999
1000 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1001 assert(bldarray != nullptr, "illegal argument");
1002
1003 if (arg == nullptr) {
1004 return;
1005 }
1006
1007 int new_count = *count + 1;
1008
1009 // expand the array and add arg to the last element
1010 if (*bldarray == nullptr) {
1011 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1012 } else {
1013 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1014 }
1015 (*bldarray)[*count] = os::strdup_check_oom(arg);
1016 *count = new_count;
1017 }
1018
1019 void Arguments::build_jvm_args(const char* arg) {
1020 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1021 }
1022
1023 void Arguments::build_jvm_flags(const char* arg) {
1024 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1025 }
1026
1027 // utility function to return a string that concatenates all
1028 // strings in a given char** array
1029 const char* Arguments::build_resource_string(char** args, int count) {
1030 if (args == nullptr || count == 0) {
1031 return nullptr;
1032 }
1033 size_t length = 0;
1034 for (int i = 0; i < count; i++) {
1035 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1036 }
1037 char* s = NEW_RESOURCE_ARRAY(char, length);
1038 char* dst = s;
1039 for (int j = 0; j < count; j++) {
1040 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1041 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1042 dst += offset;
1043 length -= offset;
1044 }
1045 return (const char*) s;
1046 }
1047
1048 void Arguments::print_on(outputStream* st) {
1049 st->print_cr("VM Arguments:");
1050 if (num_jvm_flags() > 0) {
1051 st->print("jvm_flags: "); print_jvm_flags_on(st);
1052 st->cr();
1053 }
1054 if (num_jvm_args() > 0) {
1055 st->print("jvm_args: "); print_jvm_args_on(st);
1056 st->cr();
1057 }
1058 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1059 if (_java_class_path != nullptr) {
1060 char* path = _java_class_path->value();
1061 size_t len = strlen(path);
1062 st->print("java_class_path (initial): ");
1063 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1064 if (len == 0) {
1065 st->print_raw_cr("<not set>");
1066 } else {
1067 st->print_raw_cr(path, len);
1068 }
1069 }
1070 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1071 }
1072
1073 void Arguments::print_summary_on(outputStream* st) {
1074 // Print the command line. Environment variables that are helpful for
1075 // reproducing the problem are written later in the hs_err file.
1076 // flags are from setting file
1077 if (num_jvm_flags() > 0) {
1078 st->print_raw("Settings File: ");
1079 print_jvm_flags_on(st);
1080 st->cr();
1081 }
1082 // args are the command line and environment variable arguments.
1083 st->print_raw("Command Line: ");
1084 if (num_jvm_args() > 0) {
1085 print_jvm_args_on(st);
1086 }
1087 // this is the classfile and any arguments to the java program
1088 if (java_command() != nullptr) {
1089 st->print("%s", java_command());
1090 }
1091 st->cr();
1092 }
1093
1094 void Arguments::set_jvm_flags_file(const char *value) {
1095 if (_jvm_flags_file != nullptr) {
1096 os::free(_jvm_flags_file);
1097 }
1098 _jvm_flags_file = os::strdup_check_oom(value);
1099 }
1100
1101 void Arguments::print_jvm_flags_on(outputStream* st) {
1102 if (_num_jvm_flags > 0) {
1103 for (int i=0; i < _num_jvm_flags; i++) {
1104 st->print("%s ", _jvm_flags_array[i]);
1105 }
1106 }
1107 }
1108
1109 void Arguments::print_jvm_args_on(outputStream* st) {
1110 if (_num_jvm_args > 0) {
1111 for (int i=0; i < _num_jvm_args; i++) {
1112 st->print("%s ", _jvm_args_array[i]);
1113 }
1114 }
1115 }
1116
1117 bool Arguments::process_argument(const char* arg,
1118 jboolean ignore_unrecognized,
1119 JVMFlagOrigin origin) {
1120 JDK_Version since = JDK_Version();
1121
1122 if (parse_argument(arg, origin)) {
1123 return true;
1124 }
1125
1126 // Determine if the flag has '+', '-', or '=' characters.
1127 bool has_plus_minus = (*arg == '+' || *arg == '-');
1128 const char* const argname = has_plus_minus ? arg + 1 : arg;
1129
1130 size_t arg_len;
1131 const char* equal_sign = strchr(argname, '=');
1132 if (equal_sign == nullptr) {
1133 arg_len = strlen(argname);
1134 } else {
1135 arg_len = equal_sign - argname;
1136 }
1137
1138 // Only make the obsolete check for valid arguments.
1139 if (arg_len <= BUFLEN) {
1140 // Construct a string which consists only of the argument name without '+', '-', or '='.
1141 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1142 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1143 if (is_obsolete_flag(stripped_argname, &since)) {
1144 char version[256];
1145 since.to_string(version, sizeof(version));
1146 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1147 return true;
1148 }
1149 }
1150
1151 // For locked flags, report a custom error message if available.
1152 // Otherwise, report the standard unrecognized VM option.
1153 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1154 if (found_flag != nullptr) {
1155 char locked_message_buf[BUFLEN];
1156 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1157 if (strlen(locked_message_buf) != 0) {
1158 #ifdef PRODUCT
1159 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1160 if (ignore_unrecognized && mismatched) {
1161 return true;
1162 }
1163 #endif
1164 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1165 }
1166 if (found_flag->is_bool() && !has_plus_minus) {
1167 jio_fprintf(defaultStream::error_stream(),
1168 "Missing +/- setting for VM option '%s'\n", argname);
1169 } else if (!found_flag->is_bool() && has_plus_minus) {
1170 jio_fprintf(defaultStream::error_stream(),
1171 "Unexpected +/- setting in VM option '%s'\n", argname);
1172 } else {
1173 jio_fprintf(defaultStream::error_stream(),
1174 "Improperly specified VM option '%s'\n", argname);
1175 }
1176 } else {
1177 if (ignore_unrecognized) {
1178 return true;
1179 }
1180 jio_fprintf(defaultStream::error_stream(),
1181 "Unrecognized VM option '%s'\n", argname);
1182 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1183 if (fuzzy_matched != nullptr) {
1184 jio_fprintf(defaultStream::error_stream(),
1185 "Did you mean '%s%s%s'?\n",
1186 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1187 fuzzy_matched->name(),
1188 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1189 }
1190 }
1191
1192 // allow for commandline "commenting out" options like -XX:#+Verbose
1193 return arg[0] == '#';
1194 }
1195
1196 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1197 FILE* stream = os::fopen(file_name, "rb");
1198 if (stream == nullptr) {
1199 if (should_exist) {
1200 jio_fprintf(defaultStream::error_stream(),
1201 "Could not open settings file %s\n", file_name);
1202 return false;
1203 } else {
1204 return true;
1205 }
1206 }
1207
1208 char token[1024];
1209 size_t pos = 0;
1210
1211 bool in_white_space = true;
1212 bool in_comment = false;
1213 bool in_quote = false;
1214 char quote_c = 0;
1215 bool result = true;
1216
1217 int c_or_eof = getc(stream);
1218 while (c_or_eof != EOF && pos < (sizeof(token) - 1)) {
1219 // We have checked the c_or_eof for EOF. getc should only ever return the
1220 // EOF or an unsigned char converted to an int. We cast down to a char to
1221 // avoid the char to int promotions we would otherwise do in the comparisons
1222 // below (which would be incorrect if we ever compared to a non-ascii char),
1223 // and the int to char conversions we would otherwise do in the assignments.
1224 const char c = static_cast<char>(c_or_eof);
1225 if (in_white_space) {
1226 if (in_comment) {
1227 if (c == '\n') in_comment = false;
1228 } else {
1229 if (c == '#') in_comment = true;
1230 else if (!isspace((unsigned char) c)) {
1231 in_white_space = false;
1232 token[pos++] = c;
1233 }
1234 }
1235 } else {
1236 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1237 // token ends at newline, or at unquoted whitespace
1238 // this allows a way to include spaces in string-valued options
1239 token[pos] = '\0';
1240 logOption(token);
1241 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1242 build_jvm_flags(token);
1243 pos = 0;
1244 in_white_space = true;
1245 in_quote = false;
1246 } else if (!in_quote && (c == '\'' || c == '"')) {
1247 in_quote = true;
1248 quote_c = c;
1249 } else if (in_quote && (c == quote_c)) {
1250 in_quote = false;
1251 } else {
1252 token[pos++] = c;
1253 }
1254 }
1255 c_or_eof = getc(stream);
1256 }
1257 if (pos > 0) {
1258 token[pos] = '\0';
1259 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1260 build_jvm_flags(token);
1261 }
1262 fclose(stream);
1263 return result;
1264 }
1265
1266 //=============================================================================================================
1267 // Parsing of properties (-D)
1268
1269 const char* Arguments::get_property(const char* key) {
1270 return PropertyList_get_value(system_properties(), key);
1271 }
1272
1273 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1274 const char* eq = strchr(prop, '=');
1275 const char* key;
1276 const char* value = "";
1277
1278 if (eq == nullptr) {
1279 // property doesn't have a value, thus use passed string
1280 key = prop;
1281 } else {
1282 // property have a value, thus extract it and save to the
1283 // allocated string
1284 size_t key_len = eq - prop;
1285 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1286
1287 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1288 key = tmp_key;
1289
1290 value = &prop[key_len + 1];
1291 }
1292
1293 if (internal == ExternalProperty) {
1294 CDSConfig::check_incompatible_property(key, value);
1295 }
1296
1297 if (strcmp(key, "java.compiler") == 0) {
1298 // we no longer support java.compiler system property, log a warning and let it get
1299 // passed to Java, like any other system property
1300 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1301 // for applications using NONE or empty value, log a more informative message
1302 warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1303 } else {
1304 warning("The java.compiler system property is obsolete and no longer supported.");
1305 }
1306 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1307 // append is true, writable is true, internal is false
1308 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1309 WriteableProperty, ExternalProperty);
1310 } else {
1311 if (strcmp(key, "sun.java.command") == 0) {
1312 char *old_java_command = _java_command;
1313 _java_command = os::strdup_check_oom(value, mtArguments);
1314 if (old_java_command != nullptr) {
1315 os::free(old_java_command);
1316 }
1317 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1318 // If this property is set on the command line then its value will be
1319 // displayed in VM error logs as the URL at which to submit such logs.
1320 // Normally the URL displayed in error logs is different from the value
1321 // of this system property, so a different property should have been
1322 // used here, but we leave this as-is in case someone depends upon it.
1323 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1324 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1325 // its value without going through the property list or making a Java call.
1326 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1327 if (old_java_vendor_url_bug != nullptr) {
1328 os::free((void *)old_java_vendor_url_bug);
1329 }
1330 }
1331
1332 // Create new property and add at the end of the list
1333 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1334 }
1335
1336 if (key != prop) {
1337 // SystemProperty copy passed value, thus free previously allocated
1338 // memory
1339 FreeHeap((void *)key);
1340 }
1341
1342 return true;
1343 }
1344
1345 //===========================================================================================================
1346 // Setting int/mixed/comp mode flags
1347
1348 void Arguments::set_mode_flags(Mode mode) {
1349 // Set up default values for all flags.
1350 // If you add a flag to any of the branches below,
1351 // add a default value for it here.
1352 _mode = mode;
1353
1354 // Ensure Agent_OnLoad has the correct initial values.
1355 // This may not be the final mode; mode may change later in onload phase.
1356 PropertyList_unique_add(&_system_properties, "java.vm.info",
1357 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1358
1359 UseInterpreter = true;
1360 UseCompiler = true;
1361 UseLoopCounter = true;
1362
1363 // Default values may be platform/compiler dependent -
1364 // use the saved values
1365 ClipInlining = Arguments::_ClipInlining;
1366 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1367 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1368 BackgroundCompilation = Arguments::_BackgroundCompilation;
1369
1370 // Change from defaults based on mode
1371 switch (mode) {
1372 default:
1373 ShouldNotReachHere();
1374 break;
1375 case _int:
1376 UseCompiler = false;
1377 UseLoopCounter = false;
1378 AlwaysCompileLoopMethods = false;
1379 UseOnStackReplacement = false;
1380 break;
1381 case _mixed:
1382 // same as default
1383 break;
1384 case _comp:
1385 UseInterpreter = false;
1386 BackgroundCompilation = false;
1387 ClipInlining = false;
1388 break;
1389 }
1390 }
1391
1392 // Conflict: required to use shared spaces (-Xshare:on), but
1393 // incompatible command line options were chosen.
1394 void Arguments::no_shared_spaces(const char* message) {
1395 if (RequireSharedSpaces) {
1396 aot_log_error(aot)("%s is incompatible with other specified options.",
1397 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1398 if (CDSConfig::new_aot_flags_used()) {
1399 vm_exit_during_initialization("Unable to use AOT cache", message);
1400 } else {
1401 vm_exit_during_initialization("Unable to use shared archive", message);
1402 }
1403 } else {
1404 if (CDSConfig::new_aot_flags_used()) {
1405 log_warning(aot)("Unable to use AOT cache: %s", message);
1406 } else {
1407 aot_log_info(aot)("Unable to use shared archive: %s", message);
1408 }
1409 UseSharedSpaces = false;
1410 }
1411 }
1412
1413 static void set_object_alignment() {
1414 // Object alignment.
1415 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1416 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1417 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1418 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1419 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1420 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1421
1422 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1423 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1424
1425 // Oop encoding heap max
1426 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1427 }
1428
1429 size_t Arguments::max_heap_for_compressed_oops() {
1430 // Avoid sign flip.
1431 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1432 // We need to fit both the null page and the heap into the memory budget, while
1433 // keeping alignment constraints of the heap. To guarantee the latter, as the
1434 // null page is located before the heap, we pad the null page to the conservative
1435 // maximum alignment that the GC may ever impose upon the heap.
1436 size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1437 _conservative_max_heap_alignment);
1438
1439 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1440 NOT_LP64(ShouldNotReachHere(); return 0);
1441 }
1442
1443 void Arguments::set_use_compressed_oops() {
1444 #ifdef _LP64
1445 // MaxHeapSize is not set up properly at this point, but
1446 // the only value that can override MaxHeapSize if we are
1447 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1448 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1449
1450 if (max_heap_size <= max_heap_for_compressed_oops()) {
1451 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1452 FLAG_SET_ERGO(UseCompressedOops, true);
1453 }
1454 } else {
1455 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1456 warning("Max heap size too large for Compressed Oops");
1457 FLAG_SET_DEFAULT(UseCompressedOops, false);
1458 }
1459 }
1460 #endif // _LP64
1461 }
1462
1463 void Arguments::set_conservative_max_heap_alignment() {
1464 // The conservative maximum required alignment for the heap is the maximum of
1465 // the alignments imposed by several sources: any requirements from the heap
1466 // itself and the maximum page size we may run the VM with.
1467 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1468 _conservative_max_heap_alignment = MAX3(heap_alignment,
1469 os::vm_allocation_granularity(),
1470 os::max_page_size());
1471 assert(is_power_of_2(_conservative_max_heap_alignment), "Expected to be a power-of-2");
1472 }
1473
1474 jint Arguments::set_ergonomics_flags() {
1475 GCConfig::initialize();
1476
1477 set_conservative_max_heap_alignment();
1478
1479 #ifdef _LP64
1480 set_use_compressed_oops();
1481
1482 // Also checks that certain machines are slower with compressed oops
1483 // in vm_version initialization code.
1484 #endif // _LP64
1485
1486 return JNI_OK;
1487 }
1488
1489 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1490 // The AggressiveHeap check is a temporary workaround to avoid calling
1491 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1492 // selected. This works because AggressiveHeap implies UseParallelGC
1493 // where we know the ratio will be 1. Once the AggressiveHeap option is
1494 // removed, this can be cleaned up.
1495 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1496 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1497 size_t max_allocatable = os::commit_memory_limit();
1498
1499 return MIN2(limit, max_allocatable / fraction);
1500 }
1501
1502 // Use static initialization to get the default before parsing
1503 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1504
1505 static size_t clamp_by_size_t_max(uint64_t value) {
1506 return (size_t)MIN2(value, (uint64_t)std::numeric_limits<size_t>::max());
1507 }
1508
1509 void Arguments::set_heap_size() {
1510 // Check if the user has configured any limit on the amount of RAM we may use.
1511 bool has_ram_limit = !FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1512 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1513 !FLAG_IS_DEFAULT(InitialRAMPercentage);
1514
1515 // Limit the available memory if client emulation mode is enabled.
1516 const size_t avail_mem = CompilerConfig::should_set_client_emulation_mode_flags()
1517 ? 1ULL*G
1518 : os::physical_memory();
1519
1520 // If the maximum heap size has not been set with -Xmx, then set it as
1521 // fraction of the size of physical memory, respecting the maximum and
1522 // minimum sizes of the heap.
1523 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1524 uint64_t min_memory = (uint64_t)(((double)avail_mem * MinRAMPercentage) / 100);
1525 uint64_t max_memory = (uint64_t)(((double)avail_mem * MaxRAMPercentage) / 100);
1526
1527 const size_t reasonable_min = clamp_by_size_t_max(min_memory);
1528 size_t reasonable_max = clamp_by_size_t_max(max_memory);
1529
1530 if (reasonable_min < MaxHeapSize) {
1531 // Small physical memory, so use a minimum fraction of it for the heap
1532 reasonable_max = reasonable_min;
1533 } else {
1534 // Not-small physical memory, so require a heap at least
1535 // as large as MaxHeapSize
1536 reasonable_max = MAX2(reasonable_max, MaxHeapSize);
1537 }
1538
1539 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1540 // Limit the heap size to ErgoHeapSizeLimit
1541 reasonable_max = MIN2(reasonable_max, ErgoHeapSizeLimit);
1542 }
1543
1544 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1545
1546 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1547 // An initial heap size was specified on the command line,
1548 // so be sure that the maximum size is consistent. Done
1549 // after call to limit_heap_by_allocatable_memory because that
1550 // method might reduce the allocation size.
1551 reasonable_max = MAX2(reasonable_max, InitialHeapSize);
1552 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1553 reasonable_max = MAX2(reasonable_max, MinHeapSize);
1554 }
1555
1556 #ifdef _LP64
1557 if (UseCompressedOops || UseCompressedClassPointers) {
1558 // HeapBaseMinAddress can be greater than default but not less than.
1559 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1560 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1561 // matches compressed oops printing flags
1562 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu "
1563 "(%zuG) which is greater than value given %zu",
1564 DefaultHeapBaseMinAddress,
1565 DefaultHeapBaseMinAddress/G,
1566 HeapBaseMinAddress);
1567 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1568 }
1569 }
1570 }
1571
1572 if (UseCompressedOops) {
1573 uintptr_t heap_end = HeapBaseMinAddress + MaxHeapSize;
1574 uintptr_t max_coop_heap = max_heap_for_compressed_oops();
1575
1576 // Limit the heap size to the maximum possible when using compressed oops
1577 if (heap_end < max_coop_heap) {
1578 // Heap should be above HeapBaseMinAddress to get zero based compressed
1579 // oops but it should be not less than default MaxHeapSize.
1580 max_coop_heap -= HeapBaseMinAddress;
1581 }
1582
1583 // If the user has configured any limit on the amount of RAM we may use,
1584 // then disable compressed oops if the calculated max exceeds max_coop_heap
1585 // and UseCompressedOops was not specified.
1586 if (reasonable_max > max_coop_heap) {
1587 if (FLAG_IS_ERGO(UseCompressedOops) && has_ram_limit) {
1588 log_debug(gc, heap, coops)("UseCompressedOops disabled due to "
1589 "max heap %zu > compressed oop heap %zu. "
1590 "Please check the setting of MaxRAMPercentage %5.2f.",
1591 reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1592 FLAG_SET_ERGO(UseCompressedOops, false);
1593 } else {
1594 reasonable_max = max_coop_heap;
1595 }
1596 }
1597 }
1598 #endif // _LP64
1599
1600 log_trace(gc, heap)(" Maximum heap size %zu", reasonable_max);
1601 FLAG_SET_ERGO(MaxHeapSize, reasonable_max);
1602 }
1603
1604 // If the minimum or initial heap_size have not been set or requested to be set
1605 // ergonomically, set them accordingly.
1606 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1607 size_t reasonable_minimum = clamp_by_size_t_max((uint64_t)OldSize + (uint64_t)NewSize);
1608 reasonable_minimum = MIN2(reasonable_minimum, MaxHeapSize);
1609 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1610
1611 if (InitialHeapSize == 0) {
1612 uint64_t initial_memory = (uint64_t)(((double)avail_mem * InitialRAMPercentage) / 100);
1613 size_t reasonable_initial = clamp_by_size_t_max(initial_memory);
1614 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1615
1616 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, MinHeapSize);
1617 reasonable_initial = MIN2(reasonable_initial, MaxHeapSize);
1618
1619 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1620 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize);
1621 }
1622
1623 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1624 // synchronize with InitialHeapSize to avoid errors with the default value.
1625 if (MinHeapSize == 0) {
1626 FLAG_SET_ERGO(MinHeapSize, MIN2(reasonable_minimum, InitialHeapSize));
1627 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize);
1628 }
1629 }
1630 }
1631
1632 // This option inspects the machine and attempts to set various
1633 // parameters to be optimal for long-running, memory allocation
1634 // intensive jobs. It is intended for machines with large
1635 // amounts of cpu and memory.
1636 jint Arguments::set_aggressive_heap_flags() {
1637 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1638 // VM, but we may not be able to represent the total physical memory
1639 // available (like having 8gb of memory on a box but using a 32bit VM).
1640 // Thus, we need to make sure we're using a julong for intermediate
1641 // calculations.
1642 julong initHeapSize;
1643 physical_memory_size_type phys_mem = os::physical_memory();
1644 julong total_memory = static_cast<julong>(phys_mem);
1645
1646 if (total_memory < (julong) 256 * M) {
1647 jio_fprintf(defaultStream::error_stream(),
1648 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1649 vm_exit(1);
1650 }
1651
1652 // The heap size is half of available memory, or (at most)
1653 // all of possible memory less 160mb (leaving room for the OS
1654 // when using ISM). This is the maximum; because adaptive sizing
1655 // is turned on below, the actual space used may be smaller.
1656
1657 initHeapSize = MIN2(total_memory / (julong) 2,
1658 total_memory - (julong) 160 * M);
1659
1660 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1661
1662 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1663 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1664 return JNI_EINVAL;
1665 }
1666 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1667 return JNI_EINVAL;
1668 }
1669 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1670 return JNI_EINVAL;
1671 }
1672 }
1673 if (FLAG_IS_DEFAULT(NewSize)) {
1674 // Make the young generation 3/8ths of the total heap.
1675 if (FLAG_SET_CMDLINE(NewSize,
1676 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1677 return JNI_EINVAL;
1678 }
1679 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1680 return JNI_EINVAL;
1681 }
1682 }
1683
1684 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1685 FLAG_SET_DEFAULT(UseLargePages, true);
1686 #endif
1687
1688 // Increase some data structure sizes for efficiency
1689 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1690 return JNI_EINVAL;
1691 }
1692 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1693 return JNI_EINVAL;
1694 }
1695
1696 // See the OldPLABSize comment below, but replace 'after promotion'
1697 // with 'after copying'. YoungPLABSize is the size of the survivor
1698 // space per-gc-thread buffers. The default is 4kw.
1699 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1700 return JNI_EINVAL;
1701 }
1702
1703 // OldPLABSize is the size of the buffers in the old gen that
1704 // UseParallelGC uses to promote live data that doesn't fit in the
1705 // survivor spaces. At any given time, there's one for each gc thread.
1706 // The default size is 1kw. These buffers are rarely used, since the
1707 // survivor spaces are usually big enough. For specjbb, however, there
1708 // are occasions when there's lots of live data in the young gen
1709 // and we end up promoting some of it. We don't have a definite
1710 // explanation for why bumping OldPLABSize helps, but the theory
1711 // is that a bigger PLAB results in retaining something like the
1712 // original allocation order after promotion, which improves mutator
1713 // locality. A minor effect may be that larger PLABs reduce the
1714 // number of PLAB allocation events during gc. The value of 8kw
1715 // was arrived at by experimenting with specjbb.
1716 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1717 return JNI_EINVAL;
1718 }
1719
1720 // Enable parallel GC and adaptive generation sizing
1721 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1722 return JNI_EINVAL;
1723 }
1724
1725 // Encourage steady state memory management
1726 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1727 return JNI_EINVAL;
1728 }
1729
1730 return JNI_OK;
1731 }
1732
1733 // This must be called after ergonomics.
1734 void Arguments::set_bytecode_flags() {
1735 if (!RewriteBytecodes) {
1736 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1737 }
1738 }
1739
1740 // Aggressive optimization flags
1741 jint Arguments::set_aggressive_opts_flags() {
1742 #ifdef COMPILER2
1743 if (AggressiveUnboxing) {
1744 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1745 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1746 } else if (!EliminateAutoBox) {
1747 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1748 AggressiveUnboxing = false;
1749 }
1750 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1751 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1752 } else if (!DoEscapeAnalysis) {
1753 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1754 AggressiveUnboxing = false;
1755 }
1756 }
1757 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1758 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1759 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1760 }
1761 // Feed the cache size setting into the JDK
1762 char buffer[1024];
1763 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1764 if (!add_property(buffer)) {
1765 return JNI_ENOMEM;
1766 }
1767 }
1768 #endif
1769
1770 return JNI_OK;
1771 }
1772
1773 //===========================================================================================================
1774
1775 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1776 if (_sun_java_launcher != _default_java_launcher) {
1777 os::free(const_cast<char*>(_sun_java_launcher));
1778 }
1779 _sun_java_launcher = os::strdup_check_oom(launcher);
1780 }
1781
1782 bool Arguments::created_by_java_launcher() {
1783 assert(_sun_java_launcher != nullptr, "property must have value");
1784 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1785 }
1786
1787 bool Arguments::executing_unit_tests() {
1788 return _executing_unit_tests;
1789 }
1790
1791 //===========================================================================================================
1792 // Parsing of main arguments
1793
1794 static unsigned int addreads_count = 0;
1795 static unsigned int addexports_count = 0;
1796 static unsigned int addopens_count = 0;
1797 static unsigned int patch_mod_count = 0;
1798 static unsigned int enable_native_access_count = 0;
1799 static unsigned int enable_final_field_mutation = 0;
1800 static bool patch_mod_javabase = false;
1801
1802 // Check the consistency of vm_init_args
1803 bool Arguments::check_vm_args_consistency() {
1804 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1805 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
1806 return false;
1807 }
1808
1809 // Method for adding checks for flag consistency.
1810 // The intent is to warn the user of all possible conflicts,
1811 // before returning an error.
1812 // Note: Needs platform-dependent factoring.
1813 bool status = true;
1814
1815 if (TLABRefillWasteFraction == 0) {
1816 jio_fprintf(defaultStream::error_stream(),
1817 "TLABRefillWasteFraction should be a denominator, "
1818 "not %zu\n",
1819 TLABRefillWasteFraction);
1820 status = false;
1821 }
1822
1823 status = CompilerConfig::check_args_consistency(status);
1824 #if INCLUDE_JVMCI
1825 if (status && EnableJVMCI) {
1826 // Add the JVMCI module if not using libjvmci or EnableJVMCI
1827 // was explicitly set on the command line or in the jimage.
1828 if ((!UseJVMCINativeLibrary || FLAG_IS_CMDLINE(EnableJVMCI) || FLAG_IS_JIMAGE_RESOURCE(EnableJVMCI)) && ClassLoader::is_module_observable("jdk.internal.vm.ci") && !_jvmci_module_added) {
1829 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1830 return false;
1831 }
1832 }
1833 }
1834 #endif
1835
1836 #if INCLUDE_JFR
1837 if (status && (FlightRecorderOptions || StartFlightRecording)) {
1838 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1839 return false;
1840 }
1841 }
1842 #endif
1843
1844 #ifndef SUPPORT_RESERVED_STACK_AREA
1845 if (StackReservedPages != 0) {
1846 FLAG_SET_CMDLINE(StackReservedPages, 0);
1847 warning("Reserved Stack Area not supported on this platform");
1848 }
1849 #endif
1850
1851 return status;
1852 }
1853
1854 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1855 const char* option_type) {
1856 if (ignore) return false;
1857
1858 const char* spacer = " ";
1859 if (option_type == nullptr) {
1860 option_type = ++spacer; // Set both to the empty string.
1861 }
1862
1863 jio_fprintf(defaultStream::error_stream(),
1864 "Unrecognized %s%soption: %s\n", option_type, spacer,
1865 option->optionString);
1866 return true;
1867 }
1868
1869 static const char* user_assertion_options[] = {
1870 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1871 };
1872
1873 static const char* system_assertion_options[] = {
1874 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1875 };
1876
1877 bool Arguments::parse_uint(const char* value,
1878 uint* uint_arg,
1879 uint min_size) {
1880 uint n;
1881 if (!parse_integer(value, &n)) {
1882 return false;
1883 }
1884 if (n >= min_size) {
1885 *uint_arg = n;
1886 return true;
1887 } else {
1888 return false;
1889 }
1890 }
1891
1892 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1893 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1894 CDSConfig::check_internal_module_property(prop_name, prop_value);
1895 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1896 char* property = AllocateHeap(prop_len, mtArguments);
1897 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1898 if (ret < 0 || ret >= (int)prop_len) {
1899 FreeHeap(property);
1900 return false;
1901 }
1902 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1903 // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1904 // that multiple occurrences of the associated flag just causes the existing property value to be
1905 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1906 // to a property after we have finished flag processing.
1907 bool added = add_property(property, WriteableProperty, internal);
1908 FreeHeap(property);
1909 return added;
1910 }
1911
1912 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1913 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1914 CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1915 const unsigned int props_count_limit = 1000;
1916 const int max_digits = 3;
1917 const int extra_symbols_count = 3; // includes '.', '=', '\0'
1918
1919 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1920 if (count < props_count_limit) {
1921 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1922 char* property = AllocateHeap(prop_len, mtArguments);
1923 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1924 if (ret < 0 || ret >= (int)prop_len) {
1925 FreeHeap(property);
1926 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1927 return false;
1928 }
1929 bool added = add_property(property, UnwriteableProperty, InternalProperty);
1930 FreeHeap(property);
1931 return added;
1932 }
1933
1934 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1935 return false;
1936 }
1937
1938 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1939 julong* long_arg,
1940 julong min_size,
1941 julong max_size) {
1942 if (!parse_integer(s, long_arg)) return arg_unreadable;
1943 return check_memory_size(*long_arg, min_size, max_size);
1944 }
1945
1946 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) {
1947 // Save default settings for some mode flags
1948 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1949 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1950 Arguments::_ClipInlining = ClipInlining;
1951 Arguments::_BackgroundCompilation = BackgroundCompilation;
1952
1953 // Remember the default value of SharedBaseAddress.
1954 Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1955
1956 // Setup flags for mixed which is the default
1957 set_mode_flags(_mixed);
1958
1959 jint result;
1960 for (int i = 0; i < all_args->length(); i++) {
1961 result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin);
1962 if (result != JNI_OK) {
1963 return result;
1964 }
1965 }
1966
1967 // Disable CDS for exploded image
1968 if (!has_jimage()) {
1969 no_shared_spaces("CDS disabled on exploded JDK");
1970 }
1971
1972 // We need to ensure processor and memory resources have been properly
1973 // configured - which may rely on arguments we just processed - before
1974 // doing the final argument processing. Any argument processing that
1975 // needs to know about processor and memory resources must occur after
1976 // this point.
1977
1978 os::init_container_support();
1979
1980 SystemMemoryBarrier::initialize();
1981
1982 // Do final processing now that all arguments have been parsed
1983 result = finalize_vm_init_args();
1984 if (result != JNI_OK) {
1985 return result;
1986 }
1987
1988 return JNI_OK;
1989 }
1990
1991 #if !INCLUDE_JVMTI || INCLUDE_CDS
1992 // Checks if name in command-line argument -agent{lib,path}:name[=options]
1993 // represents a valid JDWP agent. is_path==true denotes that we
1994 // are dealing with -agentpath (case where name is a path), otherwise with
1995 // -agentlib
1996 static bool valid_jdwp_agent(char *name, bool is_path) {
1997 char *_name;
1998 const char *_jdwp = "jdwp";
1999 size_t _len_jdwp, _len_prefix;
2000
2001 if (is_path) {
2002 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2003 return false;
2004 }
2005
2006 _name++; // skip past last path separator
2007 _len_prefix = strlen(JNI_LIB_PREFIX);
2008
2009 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2010 return false;
2011 }
2012
2013 _name += _len_prefix;
2014 _len_jdwp = strlen(_jdwp);
2015
2016 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2017 _name += _len_jdwp;
2018 }
2019 else {
2020 return false;
2021 }
2022
2023 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2024 return false;
2025 }
2026
2027 return true;
2028 }
2029
2030 if (strcmp(name, _jdwp) == 0) {
2031 return true;
2032 }
2033
2034 return false;
2035 }
2036 #endif
2037
2038 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2039 // --patch-module=<module>=<file>(<pathsep><file>)*
2040 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2041 // Find the equal sign between the module name and the path specification
2042 const char* module_equal = strchr(patch_mod_tail, '=');
2043 if (module_equal == nullptr) {
2044 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2045 return JNI_ERR;
2046 } else {
2047 // Pick out the module name
2048 size_t module_len = module_equal - patch_mod_tail;
2049 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2050 if (module_name != nullptr) {
2051 memcpy(module_name, patch_mod_tail, module_len);
2052 *(module_name + module_len) = '\0';
2053 // The path piece begins one past the module_equal sign
2054 add_patch_mod_prefix(module_name, module_equal + 1);
2055 FREE_C_HEAP_ARRAY(char, module_name);
2056 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2057 return JNI_ENOMEM;
2058 }
2059 } else {
2060 return JNI_ENOMEM;
2061 }
2062 }
2063 return JNI_OK;
2064 }
2065
2066 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2067 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2068 // The min and max sizes match the values in globals.hpp, but scaled
2069 // with K. The values have been chosen so that alignment with page
2070 // size doesn't change the max value, which makes the conversions
2071 // back and forth between Xss value and ThreadStackSize value easier.
2072 // The values have also been chosen to fit inside a 32-bit signed type.
2073 const julong min_ThreadStackSize = 0;
2074 const julong max_ThreadStackSize = 1 * M;
2075
2076 // Make sure the above values match the range set in globals.hpp
2077 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2078 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2079 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2080
2081 const julong min_size = min_ThreadStackSize * K;
2082 const julong max_size = max_ThreadStackSize * K;
2083
2084 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2085
2086 julong size = 0;
2087 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2088 if (errcode != arg_in_range) {
2089 bool silent = (option == nullptr); // Allow testing to silence error messages
2090 if (!silent) {
2091 jio_fprintf(defaultStream::error_stream(),
2092 "Invalid thread stack size: %s\n", option->optionString);
2093 describe_range_error(errcode);
2094 }
2095 return JNI_EINVAL;
2096 }
2097
2098 // Internally track ThreadStackSize in units of 1024 bytes.
2099 const julong size_aligned = align_up(size, K);
2100 assert(size <= size_aligned,
2101 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2102 size, size_aligned);
2103
2104 const julong size_in_K = size_aligned / K;
2105 assert(size_in_K < (julong)max_intx,
2106 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2107 size_in_K);
2108
2109 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2110 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2111 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2112 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2113 max_expanded, size_in_K);
2114
2115 *out_ThreadStackSize = (intx)size_in_K;
2116
2117 return JNI_OK;
2118 }
2119
2120 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2121 // For match_option to return remaining or value part of option string
2122 const char* tail;
2123
2124 // iterate over arguments
2125 for (int index = 0; index < args->nOptions; index++) {
2126 bool is_absolute_path = false; // for -agentpath vs -agentlib
2127
2128 const JavaVMOption* option = args->options + index;
2129
2130 if (!match_option(option, "-Djava.class.path", &tail) &&
2131 !match_option(option, "-Dsun.java.command", &tail) &&
2132 !match_option(option, "-Dsun.java.launcher", &tail)) {
2133
2134 // add all jvm options to the jvm_args string. This string
2135 // is used later to set the java.vm.args PerfData string constant.
2136 // the -Djava.class.path and the -Dsun.java.command options are
2137 // omitted from jvm_args string as each have their own PerfData
2138 // string constant object.
2139 build_jvm_args(option->optionString);
2140 }
2141
2142 // -verbose:[class/module/gc/jni]
2143 if (match_option(option, "-verbose", &tail)) {
2144 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2145 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2146 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2147 } else if (!strcmp(tail, ":module")) {
2148 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2149 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2150 } else if (!strcmp(tail, ":gc")) {
2151 if (_legacyGCLogging.lastFlag == 0) {
2152 _legacyGCLogging.lastFlag = 1;
2153 }
2154 } else if (!strcmp(tail, ":jni")) {
2155 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2156 }
2157 // -da / -ea / -disableassertions / -enableassertions
2158 // These accept an optional class/package name separated by a colon, e.g.,
2159 // -da:java.lang.Thread.
2160 } else if (match_option(option, user_assertion_options, &tail, true)) {
2161 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2162 if (*tail == '\0') {
2163 JavaAssertions::setUserClassDefault(enable);
2164 } else {
2165 assert(*tail == ':', "bogus match by match_option()");
2166 JavaAssertions::addOption(tail + 1, enable);
2167 }
2168 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2169 } else if (match_option(option, system_assertion_options, &tail, false)) {
2170 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2171 JavaAssertions::setSystemClassDefault(enable);
2172 // -bootclasspath:
2173 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2174 jio_fprintf(defaultStream::output_stream(),
2175 "-Xbootclasspath is no longer a supported option.\n");
2176 return JNI_EINVAL;
2177 // -bootclasspath/a:
2178 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2179 Arguments::append_sysclasspath(tail);
2180 // -bootclasspath/p:
2181 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2182 jio_fprintf(defaultStream::output_stream(),
2183 "-Xbootclasspath/p is no longer a supported option.\n");
2184 return JNI_EINVAL;
2185 // -Xrun
2186 } else if (match_option(option, "-Xrun", &tail)) {
2187 if (tail != nullptr) {
2188 const char* pos = strchr(tail, ':');
2189 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2190 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2191 jio_snprintf(name, len + 1, "%s", tail);
2192
2193 char *options = nullptr;
2194 if(pos != nullptr) {
2195 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2196 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2197 }
2198 #if !INCLUDE_JVMTI
2199 if (strcmp(name, "jdwp") == 0) {
2200 jio_fprintf(defaultStream::error_stream(),
2201 "Debugging agents are not supported in this VM\n");
2202 return JNI_ERR;
2203 }
2204 #endif // !INCLUDE_JVMTI
2205 JvmtiAgentList::add_xrun(name, options, false);
2206 FREE_C_HEAP_ARRAY(char, name);
2207 FREE_C_HEAP_ARRAY(char, options);
2208 }
2209 } else if (match_option(option, "--add-reads=", &tail)) {
2210 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2211 return JNI_ENOMEM;
2212 }
2213 } else if (match_option(option, "--add-exports=", &tail)) {
2214 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2215 return JNI_ENOMEM;
2216 }
2217 } else if (match_option(option, "--add-opens=", &tail)) {
2218 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2219 return JNI_ENOMEM;
2220 }
2221 } else if (match_option(option, "--add-modules=", &tail)) {
2222 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2223 return JNI_ENOMEM;
2224 }
2225 #if INCLUDE_JVMCI
2226 if (!_jvmci_module_added) {
2227 const char *jvmci_module = strstr(tail, "jdk.internal.vm.ci");
2228 if (jvmci_module != nullptr) {
2229 char before = *(jvmci_module - 1);
2230 char after = *(jvmci_module + strlen("jdk.internal.vm.ci"));
2231 if ((before == '=' || before == ',') && (after == '\0' || after == ',')) {
2232 FLAG_SET_DEFAULT(EnableJVMCI, true);
2233 _jvmci_module_added = true;
2234 }
2235 }
2236 }
2237 #endif
2238 } else if (match_option(option, "--enable-native-access=", &tail)) {
2239 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2240 return JNI_ENOMEM;
2241 }
2242 } else if (match_option(option, "--illegal-native-access=", &tail)) {
2243 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2244 return JNI_ENOMEM;
2245 }
2246 } else if (match_option(option, "--limit-modules=", &tail)) {
2247 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2248 return JNI_ENOMEM;
2249 }
2250 } else if (match_option(option, "--module-path=", &tail)) {
2251 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2252 return JNI_ENOMEM;
2253 }
2254 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2255 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2256 return JNI_ENOMEM;
2257 }
2258 } else if (match_option(option, "--patch-module=", &tail)) {
2259 // --patch-module=<module>=<file>(<pathsep><file>)*
2260 int res = process_patch_mod_option(tail);
2261 if (res != JNI_OK) {
2262 return res;
2263 }
2264 } else if (match_option(option, "--enable-final-field-mutation=", &tail)) {
2265 if (!create_numbered_module_property("jdk.module.enable.final.field.mutation", tail, enable_final_field_mutation++)) {
2266 return JNI_ENOMEM;
2267 }
2268 } else if (match_option(option, "--illegal-final-field-mutation=", &tail)) {
2269 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2270 PropertyList_unique_add(&_system_properties, "jdk.module.illegal.final.field.mutation", tail,
2271 AddProperty, WriteableProperty, InternalProperty);
2272 } else {
2273 jio_fprintf(defaultStream::error_stream(),
2274 "Value specified to --illegal-final-field-mutation not recognized: '%s'\n", tail);
2275 return JNI_ERR;
2276 }
2277 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2278 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2279 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2280 AddProperty, WriteableProperty, InternalProperty);
2281 } else {
2282 jio_fprintf(defaultStream::error_stream(),
2283 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2284 return JNI_ERR;
2285 }
2286 } else if (match_option(option, "--illegal-access=", &tail)) {
2287 char version[256];
2288 JDK_Version::jdk(17).to_string(version, sizeof(version));
2289 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2290 // -agentlib and -agentpath
2291 } else if (match_option(option, "-agentlib:", &tail) ||
2292 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2293 if(tail != nullptr) {
2294 const char* pos = strchr(tail, '=');
2295 char* name;
2296 if (pos == nullptr) {
2297 name = os::strdup_check_oom(tail, mtArguments);
2298 } else {
2299 size_t len = pos - tail;
2300 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2301 memcpy(name, tail, len);
2302 name[len] = '\0';
2303 }
2304
2305 char *options = nullptr;
2306 if(pos != nullptr) {
2307 options = os::strdup_check_oom(pos + 1, mtArguments);
2308 }
2309 #if !INCLUDE_JVMTI
2310 if (valid_jdwp_agent(name, is_absolute_path)) {
2311 jio_fprintf(defaultStream::error_stream(),
2312 "Debugging agents are not supported in this VM\n");
2313 return JNI_ERR;
2314 }
2315 #elif INCLUDE_CDS
2316 if (valid_jdwp_agent(name, is_absolute_path)) {
2317 _has_jdwp_agent = true;
2318 }
2319 #endif // !INCLUDE_JVMTI
2320 JvmtiAgentList::add(name, options, is_absolute_path);
2321 os::free(name);
2322 os::free(options);
2323 }
2324 // -javaagent
2325 } else if (match_option(option, "-javaagent:", &tail)) {
2326 #if !INCLUDE_JVMTI
2327 jio_fprintf(defaultStream::error_stream(),
2328 "Instrumentation agents are not supported in this VM\n");
2329 return JNI_ERR;
2330 #else
2331 if (tail != nullptr) {
2332 size_t length = strlen(tail) + 1;
2333 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2334 jio_snprintf(options, length, "%s", tail);
2335 JvmtiAgentList::add("instrument", options, false);
2336 FREE_C_HEAP_ARRAY(char, options);
2337
2338 // java agents need module java.instrument
2339 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2340 return JNI_ENOMEM;
2341 }
2342 }
2343 #endif // !INCLUDE_JVMTI
2344 // --enable_preview
2345 } else if (match_option(option, "--enable-preview")) {
2346 set_enable_preview();
2347 // -Xnoclassgc
2348 } else if (match_option(option, "-Xnoclassgc")) {
2349 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2350 return JNI_EINVAL;
2351 }
2352 // -Xbatch
2353 } else if (match_option(option, "-Xbatch")) {
2354 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2355 return JNI_EINVAL;
2356 }
2357 // -Xmn for compatibility with other JVM vendors
2358 } else if (match_option(option, "-Xmn", &tail)) {
2359 julong long_initial_young_size = 0;
2360 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2361 if (errcode != arg_in_range) {
2362 jio_fprintf(defaultStream::error_stream(),
2363 "Invalid initial young generation size: %s\n", option->optionString);
2364 describe_range_error(errcode);
2365 return JNI_EINVAL;
2366 }
2367 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2368 return JNI_EINVAL;
2369 }
2370 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2371 return JNI_EINVAL;
2372 }
2373 // -Xms
2374 } else if (match_option(option, "-Xms", &tail)) {
2375 julong size = 0;
2376 // an initial heap size of 0 means automatically determine
2377 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2378 if (errcode != arg_in_range) {
2379 jio_fprintf(defaultStream::error_stream(),
2380 "Invalid initial heap size: %s\n", option->optionString);
2381 describe_range_error(errcode);
2382 return JNI_EINVAL;
2383 }
2384 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2385 return JNI_EINVAL;
2386 }
2387 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2388 return JNI_EINVAL;
2389 }
2390 // -Xmx
2391 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2392 julong long_max_heap_size = 0;
2393 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2394 if (errcode != arg_in_range) {
2395 jio_fprintf(defaultStream::error_stream(),
2396 "Invalid maximum heap size: %s\n", option->optionString);
2397 describe_range_error(errcode);
2398 return JNI_EINVAL;
2399 }
2400 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2401 return JNI_EINVAL;
2402 }
2403 // Xmaxf
2404 } else if (match_option(option, "-Xmaxf", &tail)) {
2405 char* err;
2406 double dmaxf = strtod(tail, &err);
2407 if (*err != '\0' || *tail == '\0') {
2408 jio_fprintf(defaultStream::error_stream(),
2409 "Bad max heap free ratio: %s\n",
2410 option->optionString);
2411 return JNI_EINVAL;
2412 }
2413 if (dmaxf < 0.0 || dmaxf > 1.0) {
2414 jio_fprintf(defaultStream::error_stream(),
2415 "-Xmaxf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2416 option->optionString);
2417 return JNI_EINVAL;
2418 }
2419 const uintx umaxf = (uintx)(dmaxf * 100);
2420 if (MinHeapFreeRatio > umaxf) {
2421 jio_fprintf(defaultStream::error_stream(),
2422 "-Xmaxf value (%s) must be greater than or equal to the implicit -Xminf value (%.2f)\n",
2423 tail, MinHeapFreeRatio / 100.0f);
2424 return JNI_EINVAL;
2425 }
2426 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, umaxf) != JVMFlag::SUCCESS) {
2427 return JNI_EINVAL;
2428 }
2429 // Xminf
2430 } else if (match_option(option, "-Xminf", &tail)) {
2431 char* err;
2432 double dminf = strtod(tail, &err);
2433 if (*err != '\0' || *tail == '\0') {
2434 jio_fprintf(defaultStream::error_stream(),
2435 "Bad min heap free ratio: %s\n",
2436 option->optionString);
2437 return JNI_EINVAL;
2438 }
2439 if (dminf < 0.0 || dminf > 1.0) {
2440 jio_fprintf(defaultStream::error_stream(),
2441 "-Xminf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n",
2442 tail);
2443 return JNI_EINVAL;
2444 }
2445 const uintx uminf = (uintx)(dminf * 100);
2446 if (MaxHeapFreeRatio < uminf) {
2447 jio_fprintf(defaultStream::error_stream(),
2448 "-Xminf value (%s) must be less than or equal to the implicit -Xmaxf value (%.2f)\n",
2449 tail, MaxHeapFreeRatio / 100.0f);
2450 return JNI_EINVAL;
2451 }
2452 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, uminf) != JVMFlag::SUCCESS) {
2453 return JNI_EINVAL;
2454 }
2455 // -Xss
2456 } else if (match_option(option, "-Xss", &tail)) {
2457 intx value = 0;
2458 jint err = parse_xss(option, tail, &value);
2459 if (err != JNI_OK) {
2460 return err;
2461 }
2462 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2463 return JNI_EINVAL;
2464 }
2465 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2466 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2467 if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2468 warning("Option -Xmaxjitcodesize was deprecated in JDK 26 and will likely be removed in a future release.");
2469 }
2470 julong long_ReservedCodeCacheSize = 0;
2471
2472 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2473 if (errcode != arg_in_range) {
2474 jio_fprintf(defaultStream::error_stream(),
2475 "Invalid maximum code cache size: %s.\n", option->optionString);
2476 return JNI_EINVAL;
2477 }
2478 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2479 return JNI_EINVAL;
2480 }
2481 // -green
2482 } else if (match_option(option, "-green")) {
2483 jio_fprintf(defaultStream::error_stream(),
2484 "Green threads support not available\n");
2485 return JNI_EINVAL;
2486 // -native
2487 } else if (match_option(option, "-native")) {
2488 // HotSpot always uses native threads, ignore silently for compatibility
2489 // -Xrs
2490 } else if (match_option(option, "-Xrs")) {
2491 // Classic/EVM option, new functionality
2492 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2493 return JNI_EINVAL;
2494 }
2495 // -Xprof
2496 } else if (match_option(option, "-Xprof")) {
2497 char version[256];
2498 // Obsolete in JDK 10
2499 JDK_Version::jdk(10).to_string(version, sizeof(version));
2500 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2501 // -Xinternalversion
2502 } else if (match_option(option, "-Xinternalversion")) {
2503 jio_fprintf(defaultStream::output_stream(), "%s\n",
2504 VM_Version::internal_vm_info_string());
2505 vm_exit(0);
2506 #ifndef PRODUCT
2507 // -Xprintflags
2508 } else if (match_option(option, "-Xprintflags")) {
2509 JVMFlag::printFlags(tty, false);
2510 vm_exit(0);
2511 #endif
2512 // -D
2513 } else if (match_option(option, "-D", &tail)) {
2514 const char* value;
2515 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2516 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2517 // abort if -Djava.endorsed.dirs is set
2518 jio_fprintf(defaultStream::output_stream(),
2519 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2520 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2521 return JNI_EINVAL;
2522 }
2523 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2524 *value != '\0' && strcmp(value, "\"\"") != 0) {
2525 // abort if -Djava.ext.dirs is set
2526 jio_fprintf(defaultStream::output_stream(),
2527 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2528 return JNI_EINVAL;
2529 }
2530 // Check for module related properties. They must be set using the modules
2531 // options. For example: use "--add-modules=java.sql", not
2532 // "-Djdk.module.addmods=java.sql"
2533 if (is_internal_module_property(option->optionString + 2)) {
2534 needs_module_property_warning = true;
2535 continue;
2536 }
2537 if (!add_property(tail)) {
2538 return JNI_ENOMEM;
2539 }
2540 // Out of the box management support
2541 if (match_option(option, "-Dcom.sun.management", &tail)) {
2542 #if INCLUDE_MANAGEMENT
2543 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2544 return JNI_EINVAL;
2545 }
2546 // management agent in module jdk.management.agent
2547 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2548 return JNI_ENOMEM;
2549 }
2550 #else
2551 jio_fprintf(defaultStream::output_stream(),
2552 "-Dcom.sun.management is not supported in this VM.\n");
2553 return JNI_ERR;
2554 #endif
2555 }
2556 // -Xint
2557 } else if (match_option(option, "-Xint")) {
2558 set_mode_flags(_int);
2559 mode_flag_cmd_line = true;
2560 // -Xmixed
2561 } else if (match_option(option, "-Xmixed")) {
2562 set_mode_flags(_mixed);
2563 mode_flag_cmd_line = true;
2564 // -Xcomp
2565 } else if (match_option(option, "-Xcomp")) {
2566 // for testing the compiler; turn off all flags that inhibit compilation
2567 set_mode_flags(_comp);
2568 mode_flag_cmd_line = true;
2569 // -Xshare:dump
2570 } else if (match_option(option, "-Xshare:dump")) {
2571 CDSConfig::enable_dumping_static_archive();
2572 CDSConfig::set_old_cds_flags_used();
2573 // -Xshare:on
2574 } else if (match_option(option, "-Xshare:on")) {
2575 UseSharedSpaces = true;
2576 RequireSharedSpaces = true;
2577 CDSConfig::set_old_cds_flags_used();
2578 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2579 } else if (match_option(option, "-Xshare:auto")) {
2580 UseSharedSpaces = true;
2581 RequireSharedSpaces = false;
2582 xshare_auto_cmd_line = true;
2583 CDSConfig::set_old_cds_flags_used();
2584 // -Xshare:off
2585 } else if (match_option(option, "-Xshare:off")) {
2586 UseSharedSpaces = false;
2587 RequireSharedSpaces = false;
2588 CDSConfig::set_old_cds_flags_used();
2589 // -Xverify
2590 } else if (match_option(option, "-Xverify", &tail)) {
2591 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2592 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2593 return JNI_EINVAL;
2594 }
2595 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2596 return JNI_EINVAL;
2597 }
2598 } else if (strcmp(tail, ":remote") == 0) {
2599 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2600 return JNI_EINVAL;
2601 }
2602 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2603 return JNI_EINVAL;
2604 }
2605 } else if (strcmp(tail, ":none") == 0) {
2606 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2607 return JNI_EINVAL;
2608 }
2609 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2610 return JNI_EINVAL;
2611 }
2612 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2613 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2614 return JNI_EINVAL;
2615 }
2616 // -Xdebug
2617 } else if (match_option(option, "-Xdebug")) {
2618 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2619 } else if (match_option(option, "-Xloggc:", &tail)) {
2620 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2621 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2622 _legacyGCLogging.lastFlag = 2;
2623 _legacyGCLogging.file = os::strdup_check_oom(tail);
2624 } else if (match_option(option, "-Xlog", &tail)) {
2625 bool ret = false;
2626 if (strcmp(tail, ":help") == 0) {
2627 fileStream stream(defaultStream::output_stream());
2628 LogConfiguration::print_command_line_help(&stream);
2629 vm_exit(0);
2630 } else if (strcmp(tail, ":disable") == 0) {
2631 LogConfiguration::disable_logging();
2632 ret = true;
2633 } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2634 const char* async_tail = tail + strlen(":async");
2635 ret = LogConfiguration::parse_async_argument(async_tail);
2636 } else if (*tail == '\0') {
2637 ret = LogConfiguration::parse_command_line_arguments();
2638 assert(ret, "-Xlog without arguments should never fail to parse");
2639 } else if (*tail == ':') {
2640 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2641 }
2642 if (ret == false) {
2643 jio_fprintf(defaultStream::error_stream(),
2644 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2645 tail);
2646 return JNI_EINVAL;
2647 }
2648 // JNI hooks
2649 } else if (match_option(option, "-Xcheck", &tail)) {
2650 if (!strcmp(tail, ":jni")) {
2651 #if !INCLUDE_JNI_CHECK
2652 warning("JNI CHECKING is not supported in this VM");
2653 #else
2654 CheckJNICalls = true;
2655 #endif // INCLUDE_JNI_CHECK
2656 } else if (is_bad_option(option, args->ignoreUnrecognized,
2657 "check")) {
2658 return JNI_EINVAL;
2659 }
2660 } else if (match_option(option, "vfprintf")) {
2661 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2662 } else if (match_option(option, "exit")) {
2663 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2664 } else if (match_option(option, "abort")) {
2665 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2666 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2667 // and the last option wins.
2668 } else if (match_option(option, "-XX:+NeverTenure")) {
2669 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2670 return JNI_EINVAL;
2671 }
2672 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2673 return JNI_EINVAL;
2674 }
2675 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2676 return JNI_EINVAL;
2677 }
2678 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2679 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2680 return JNI_EINVAL;
2681 }
2682 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2683 return JNI_EINVAL;
2684 }
2685 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2686 return JNI_EINVAL;
2687 }
2688 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2689 uint max_tenuring_thresh = 0;
2690 if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2691 jio_fprintf(defaultStream::error_stream(),
2692 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2693 return JNI_EINVAL;
2694 }
2695
2696 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2697 return JNI_EINVAL;
2698 }
2699
2700 if (MaxTenuringThreshold == 0) {
2701 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2702 return JNI_EINVAL;
2703 }
2704 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2705 return JNI_EINVAL;
2706 }
2707 } else {
2708 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2709 return JNI_EINVAL;
2710 }
2711 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2712 return JNI_EINVAL;
2713 }
2714 }
2715 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2716 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2717 return JNI_EINVAL;
2718 }
2719 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2720 return JNI_EINVAL;
2721 }
2722 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2723 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2724 return JNI_EINVAL;
2725 }
2726 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2727 return JNI_EINVAL;
2728 }
2729 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2730 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2731 return JNI_EINVAL;
2732 }
2733 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2734 return JNI_EINVAL;
2735 }
2736 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2737 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2738 return JNI_EINVAL;
2739 }
2740 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2741 return JNI_EINVAL;
2742 }
2743 } else if (match_option(option, "--finalization=", &tail)) {
2744 if (strcmp(tail, "enabled") == 0) {
2745 InstanceKlass::set_finalization_enabled(true);
2746 } else if (strcmp(tail, "disabled") == 0) {
2747 InstanceKlass::set_finalization_enabled(false);
2748 } else {
2749 jio_fprintf(defaultStream::error_stream(),
2750 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2751 tail);
2752 return JNI_EINVAL;
2753 }
2754 #if !defined(DTRACE_ENABLED)
2755 } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2756 jio_fprintf(defaultStream::error_stream(),
2757 "DTraceMethodProbes flag is not applicable for this configuration\n");
2758 return JNI_EINVAL;
2759 } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2760 jio_fprintf(defaultStream::error_stream(),
2761 "DTraceAllocProbes flag is not applicable for this configuration\n");
2762 return JNI_EINVAL;
2763 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2764 jio_fprintf(defaultStream::error_stream(),
2765 "DTraceMonitorProbes flag is not applicable for this configuration\n");
2766 return JNI_EINVAL;
2767 #endif // !defined(DTRACE_ENABLED)
2768 #ifdef ASSERT
2769 } else if (match_option(option, "-XX:+FullGCALot")) {
2770 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2771 return JNI_EINVAL;
2772 }
2773 #endif
2774 #if !INCLUDE_MANAGEMENT
2775 } else if (match_option(option, "-XX:+ManagementServer")) {
2776 jio_fprintf(defaultStream::error_stream(),
2777 "ManagementServer is not supported in this VM.\n");
2778 return JNI_ERR;
2779 #endif // INCLUDE_MANAGEMENT
2780 #if INCLUDE_JVMCI
2781 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2782 if (EnableJVMCIProduct) {
2783 jio_fprintf(defaultStream::error_stream(),
2784 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2785 return JNI_EINVAL;
2786 }
2787 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2788 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2789 if (use_graal_jit) {
2790 const char* jvmci_compiler = get_property("jvmci.Compiler");
2791 if (jvmci_compiler != nullptr) {
2792 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2793 jio_fprintf(defaultStream::error_stream(),
2794 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2795 return JNI_ERR;
2796 }
2797 } else if (!add_property("jvmci.Compiler=graal")) {
2798 return JNI_ENOMEM;
2799 }
2800 }
2801
2802 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2803 if (EnableJVMCIProduct) {
2804 continue;
2805 }
2806 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2807 // Allow this flag if it has been unlocked.
2808 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2809 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2810 jio_fprintf(defaultStream::error_stream(),
2811 "Unable to enable JVMCI in product mode\n");
2812 return JNI_ERR;
2813 }
2814 }
2815 // The flag was locked so process normally to report that error
2816 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2817 return JNI_EINVAL;
2818 }
2819 #endif // INCLUDE_JVMCI
2820 #if INCLUDE_JFR
2821 } else if (match_jfr_option(&option)) {
2822 return JNI_EINVAL;
2823 #endif
2824 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2825 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2826 // already been handled
2827 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2828 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2829 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2830 return JNI_EINVAL;
2831 }
2832 }
2833 // Unknown option
2834 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2835 return JNI_ERR;
2836 }
2837 }
2838
2839 // PrintSharedArchiveAndExit will turn on
2840 // -Xshare:on
2841 // -Xlog:class+path=info
2842 if (PrintSharedArchiveAndExit) {
2843 UseSharedSpaces = true;
2844 RequireSharedSpaces = true;
2845 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2846 }
2847
2848 fix_appclasspath();
2849
2850 return JNI_OK;
2851 }
2852
2853 void Arguments::set_ext_dirs(char *value) {
2854 _ext_dirs = os::strdup_check_oom(value);
2855 }
2856
2857 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) {
2858 // For java.base check for duplicate --patch-module options being specified on the command line.
2859 // This check is only required for java.base, all other duplicate module specifications
2860 // will be checked during module system initialization. The module system initialization
2861 // will throw an ExceptionInInitializerError if this situation occurs.
2862 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2863 if (patch_mod_javabase) {
2864 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2865 } else {
2866 patch_mod_javabase = true;
2867 }
2868 }
2869
2870 // Create GrowableArray lazily, only if --patch-module has been specified
2871 if (_patch_mod_prefix == nullptr) {
2872 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2873 }
2874
2875 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2876 }
2877
2878 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2879 //
2880 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2881 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2882 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2883 // path is treated as the current directory.
2884 //
2885 // This causes problems with CDS, which requires that all directories specified in the classpath
2886 // must be empty. In most cases, applications do NOT want to load classes from the current
2887 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2888 // scripts compatible with CDS.
2889 void Arguments::fix_appclasspath() {
2890 if (IgnoreEmptyClassPaths) {
2891 const char separator = *os::path_separator();
2892 const char* src = _java_class_path->value();
2893
2894 // skip over all the leading empty paths
2895 while (*src == separator) {
2896 src ++;
2897 }
2898
2899 char* copy = os::strdup_check_oom(src, mtArguments);
2900
2901 // trim all trailing empty paths
2902 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2903 *tail = '\0';
2904 }
2905
2906 char from[3] = {separator, separator, '\0'};
2907 char to [2] = {separator, '\0'};
2908 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2909 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2910 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2911 }
2912
2913 _java_class_path->set_writeable_value(copy);
2914 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2915 }
2916 }
2917
2918 jint Arguments::finalize_vm_init_args() {
2919 // check if the default lib/endorsed directory exists; if so, error
2920 char path[JVM_MAXPATHLEN];
2921 const char* fileSep = os::file_separator();
2922 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2923
2924 DIR* dir = os::opendir(path);
2925 if (dir != nullptr) {
2926 jio_fprintf(defaultStream::output_stream(),
2927 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2928 "in modular form will be supported via the concept of upgradeable modules.\n");
2929 os::closedir(dir);
2930 return JNI_ERR;
2931 }
2932
2933 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2934 dir = os::opendir(path);
2935 if (dir != nullptr) {
2936 jio_fprintf(defaultStream::output_stream(),
2937 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2938 "Use -classpath instead.\n.");
2939 os::closedir(dir);
2940 return JNI_ERR;
2941 }
2942
2943 // This must be done after all arguments have been processed
2944 // and the container support has been initialized since AggressiveHeap
2945 // relies on the amount of total memory available.
2946 if (AggressiveHeap) {
2947 jint result = set_aggressive_heap_flags();
2948 if (result != JNI_OK) {
2949 return result;
2950 }
2951 }
2952
2953 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2954 // but like -Xint, leave compilation thresholds unaffected.
2955 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2956 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2957 set_mode_flags(_int);
2958 }
2959
2960 #ifdef ZERO
2961 // Zero always runs in interpreted mode
2962 set_mode_flags(_int);
2963 #endif
2964
2965 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2966 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2967 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2968 }
2969
2970 #if !COMPILER2_OR_JVMCI
2971 // Don't degrade server performance for footprint
2972 if (FLAG_IS_DEFAULT(UseLargePages) &&
2973 MaxHeapSize < LargePageHeapSizeThreshold) {
2974 // No need for large granularity pages w/small heaps.
2975 // Note that large pages are enabled/disabled for both the
2976 // Java heap and the code cache.
2977 FLAG_SET_DEFAULT(UseLargePages, false);
2978 }
2979
2980 UNSUPPORTED_OPTION(ProfileInterpreter);
2981 #endif
2982
2983 // Parse the CompilationMode flag
2984 if (!CompilationModeFlag::initialize()) {
2985 return JNI_ERR;
2986 }
2987
2988 if (!check_vm_args_consistency()) {
2989 return JNI_ERR;
2990 }
2991
2992
2993 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2994 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2995 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2996
2997 return JNI_OK;
2998 }
2999
3000 // Helper class for controlling the lifetime of JavaVMInitArgs
3001 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3002 // deleted on the destruction of the ScopedVMInitArgs object.
3003 class ScopedVMInitArgs : public StackObj {
3004 private:
3005 JavaVMInitArgs _args;
3006 char* _container_name;
3007 bool _is_set;
3008 char* _vm_options_file_arg;
3009
3010 public:
3011 ScopedVMInitArgs(const char *container_name) {
3012 _args.version = JNI_VERSION_1_2;
3013 _args.nOptions = 0;
3014 _args.options = nullptr;
3015 _args.ignoreUnrecognized = false;
3016 _container_name = (char *)container_name;
3017 _is_set = false;
3018 _vm_options_file_arg = nullptr;
3019 }
3020
3021 // Populates the JavaVMInitArgs object represented by this
3022 // ScopedVMInitArgs object with the arguments in options. The
3023 // allocated memory is deleted by the destructor. If this method
3024 // returns anything other than JNI_OK, then this object is in a
3025 // partially constructed state, and should be abandoned.
3026 jint set_args(const GrowableArrayView<JavaVMOption>* options) {
3027 _is_set = true;
3028 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3029 JavaVMOption, options->length(), mtArguments);
3030 if (options_arr == nullptr) {
3031 return JNI_ENOMEM;
3032 }
3033 _args.options = options_arr;
3034
3035 for (int i = 0; i < options->length(); i++) {
3036 options_arr[i] = options->at(i);
3037 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3038 if (options_arr[i].optionString == nullptr) {
3039 // Rely on the destructor to do cleanup.
3040 _args.nOptions = i;
3041 return JNI_ENOMEM;
3042 }
3043 }
3044
3045 _args.nOptions = options->length();
3046 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3047 return JNI_OK;
3048 }
3049
3050 JavaVMInitArgs* get() { return &_args; }
3051 char* container_name() { return _container_name; }
3052 bool is_set() { return _is_set; }
3053 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3054 char* vm_options_file_arg() { return _vm_options_file_arg; }
3055
3056 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3057 if (_vm_options_file_arg != nullptr) {
3058 os::free(_vm_options_file_arg);
3059 }
3060 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3061 }
3062
3063 ~ScopedVMInitArgs() {
3064 if (_vm_options_file_arg != nullptr) {
3065 os::free(_vm_options_file_arg);
3066 }
3067 if (_args.options == nullptr) return;
3068 for (int i = 0; i < _args.nOptions; i++) {
3069 os::free(_args.options[i].optionString);
3070 }
3071 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3072 }
3073
3074 // Insert options into this option list, to replace option at
3075 // vm_options_file_pos (-XX:VMOptionsFile)
3076 jint insert(const JavaVMInitArgs* args,
3077 const JavaVMInitArgs* args_to_insert,
3078 const int vm_options_file_pos) {
3079 assert(_args.options == nullptr, "shouldn't be set yet");
3080 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3081 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3082
3083 int length = args->nOptions + args_to_insert->nOptions - 1;
3084 // Construct new option array
3085 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3086 for (int i = 0; i < args->nOptions; i++) {
3087 if (i == vm_options_file_pos) {
3088 // insert the new options starting at the same place as the
3089 // -XX:VMOptionsFile option
3090 for (int j = 0; j < args_to_insert->nOptions; j++) {
3091 options.push(args_to_insert->options[j]);
3092 }
3093 } else {
3094 options.push(args->options[i]);
3095 }
3096 }
3097 // make into options array
3098 return set_args(&options);
3099 }
3100 };
3101
3102 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3103 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3104 }
3105
3106 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3107 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3108 }
3109
3110 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) {
3111 for (int index = args->nOptions - 1; index >= 0; index--) {
3112 JavaVMOption* option = args->options + index;
3113 if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) {
3114 return option;
3115 }
3116 }
3117
3118 return nullptr;
3119 }
3120
3121 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args,
3122 ScopedVMInitArgs* jdk_aot_vm_options_args) {
3123 // Don't bother scanning all the args if this env variable is not set
3124 if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) {
3125 return JNI_OK;
3126 }
3127
3128 // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value
3129 // of AOTMode.
3130 JavaVMOption* option = nullptr;
3131 for (int i = all_args->length() - 1; i >= 0; i--) {
3132 if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) {
3133 break;
3134 }
3135 }
3136
3137 if (option != nullptr) {
3138 // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet,
3139 // so its value is not reflected inside the global variable AOTMode.
3140 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) {
3141 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3142 }
3143 } else {
3144 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode,
3145 // which would have been set inside process_settings_file();
3146 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) {
3147 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3148 }
3149 }
3150
3151 return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args);
3152 }
3153
3154 jint Arguments::parse_options_environment_variable(const char* name,
3155 ScopedVMInitArgs* vm_args) {
3156 char *buffer = ::getenv(name);
3157
3158 // Don't check this environment variable if user has special privileges
3159 // (e.g. unix su command).
3160 if (buffer == nullptr || os::have_special_privileges()) {
3161 return JNI_OK;
3162 }
3163
3164 if ((buffer = os::strdup(buffer)) == nullptr) {
3165 return JNI_ENOMEM;
3166 }
3167
3168 jio_fprintf(defaultStream::error_stream(),
3169 "Picked up %s: %s\n", name, buffer);
3170
3171 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3172
3173 os::free(buffer);
3174 return retcode;
3175 }
3176
3177 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3178 // read file into buffer
3179 int fd = ::open(file_name, O_RDONLY);
3180 if (fd < 0) {
3181 jio_fprintf(defaultStream::error_stream(),
3182 "Could not open options file '%s'\n",
3183 file_name);
3184 return JNI_ERR;
3185 }
3186
3187 struct stat stbuf;
3188 int retcode = os::stat(file_name, &stbuf);
3189 if (retcode != 0) {
3190 jio_fprintf(defaultStream::error_stream(),
3191 "Could not stat options file '%s'\n",
3192 file_name);
3193 ::close(fd);
3194 return JNI_ERR;
3195 }
3196
3197 if (stbuf.st_size == 0) {
3198 // tell caller there is no option data and that is ok
3199 ::close(fd);
3200 return JNI_OK;
3201 }
3202
3203 // '+ 1' for null termination even with max bytes
3204 size_t bytes_alloc = stbuf.st_size + 1;
3205
3206 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3207 if (nullptr == buf) {
3208 jio_fprintf(defaultStream::error_stream(),
3209 "Could not allocate read buffer for options file parse\n");
3210 ::close(fd);
3211 return JNI_ENOMEM;
3212 }
3213
3214 memset(buf, 0, bytes_alloc);
3215
3216 // Fill buffer
3217 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3218 ::close(fd);
3219 if (bytes_read < 0) {
3220 FREE_C_HEAP_ARRAY(char, buf);
3221 jio_fprintf(defaultStream::error_stream(),
3222 "Could not read options file '%s'\n", file_name);
3223 return JNI_ERR;
3224 }
3225
3226 if (bytes_read == 0) {
3227 // tell caller there is no option data and that is ok
3228 FREE_C_HEAP_ARRAY(char, buf);
3229 return JNI_OK;
3230 }
3231
3232 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3233
3234 FREE_C_HEAP_ARRAY(char, buf);
3235 return retcode;
3236 }
3237
3238 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3239 // Construct option array
3240 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3241
3242 // some pointers to help with parsing
3243 char *buffer_end = buffer + buf_len;
3244 char *opt_hd = buffer;
3245 char *wrt = buffer;
3246 char *rd = buffer;
3247
3248 // parse all options
3249 while (rd < buffer_end) {
3250 // skip leading white space from the input string
3251 while (rd < buffer_end && isspace((unsigned char) *rd)) {
3252 rd++;
3253 }
3254
3255 if (rd >= buffer_end) {
3256 break;
3257 }
3258
3259 // Remember this is where we found the head of the token.
3260 opt_hd = wrt;
3261
3262 // Tokens are strings of non white space characters separated
3263 // by one or more white spaces.
3264 while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3265 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3266 int quote = *rd; // matching quote to look for
3267 rd++; // don't copy open quote
3268 while (rd < buffer_end && *rd != quote) {
3269 // include everything (even spaces)
3270 // up until the close quote
3271 *wrt++ = *rd++; // copy to option string
3272 }
3273
3274 if (rd < buffer_end) {
3275 rd++; // don't copy close quote
3276 } else {
3277 // did not see closing quote
3278 jio_fprintf(defaultStream::error_stream(),
3279 "Unmatched quote in %s\n", name);
3280 return JNI_ERR;
3281 }
3282 } else {
3283 *wrt++ = *rd++; // copy to option string
3284 }
3285 }
3286
3287 // steal a white space character and set it to null
3288 *wrt++ = '\0';
3289 // We now have a complete token
3290
3291 JavaVMOption option;
3292 option.optionString = opt_hd;
3293 option.extraInfo = nullptr;
3294
3295 options.append(option); // Fill in option
3296
3297 rd++; // Advance to next character
3298 }
3299
3300 // Fill out JavaVMInitArgs structure.
3301 return vm_args->set_args(&options);
3302 }
3303
3304 #ifndef PRODUCT
3305 // Determine whether LogVMOutput should be implicitly turned on.
3306 static bool use_vm_log() {
3307 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3308 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3309 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3310 PrintAssembly || TraceDeoptimization ||
3311 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3312 return true;
3313 }
3314
3315 #ifdef COMPILER1
3316 if (PrintC1Statistics) {
3317 return true;
3318 }
3319 #endif // COMPILER1
3320
3321 #ifdef COMPILER2
3322 if (PrintOptoAssembly || PrintOptoStatistics) {
3323 return true;
3324 }
3325 #endif // COMPILER2
3326
3327 return false;
3328 }
3329
3330 #endif // PRODUCT
3331
3332 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3333 for (int index = 0; index < args->nOptions; index++) {
3334 const JavaVMOption* option = args->options + index;
3335 const char* tail;
3336 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3337 return true;
3338 }
3339 }
3340 return false;
3341 }
3342
3343 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3344 const char* vm_options_file,
3345 const int vm_options_file_pos,
3346 ScopedVMInitArgs* vm_options_file_args,
3347 ScopedVMInitArgs* args_out) {
3348 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3349 if (code != JNI_OK) {
3350 return code;
3351 }
3352
3353 if (vm_options_file_args->get()->nOptions < 1) {
3354 return JNI_OK;
3355 }
3356
3357 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3358 jio_fprintf(defaultStream::error_stream(),
3359 "A VM options file may not refer to a VM options file. "
3360 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3361 "options file '%s' in options container '%s' is an error.\n",
3362 vm_options_file_args->vm_options_file_arg(),
3363 vm_options_file_args->container_name());
3364 return JNI_EINVAL;
3365 }
3366
3367 return args_out->insert(args, vm_options_file_args->get(),
3368 vm_options_file_pos);
3369 }
3370
3371 // Expand -XX:VMOptionsFile found in args_in as needed.
3372 // mod_args and args_out parameters may return values as needed.
3373 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3374 ScopedVMInitArgs* mod_args,
3375 JavaVMInitArgs** args_out) {
3376 jint code = match_special_option_and_act(args_in, mod_args);
3377 if (code != JNI_OK) {
3378 return code;
3379 }
3380
3381 if (mod_args->is_set()) {
3382 // args_in contains -XX:VMOptionsFile and mod_args contains the
3383 // original options from args_in along with the options expanded
3384 // from the VMOptionsFile. Return a short-hand to the caller.
3385 *args_out = mod_args->get();
3386 } else {
3387 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3388 }
3389 return JNI_OK;
3390 }
3391
3392 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3393 ScopedVMInitArgs* args_out) {
3394 // Remaining part of option string
3395 const char* tail;
3396 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3397
3398 for (int index = 0; index < args->nOptions; index++) {
3399 const JavaVMOption* option = args->options + index;
3400 if (match_option(option, "-XX:Flags=", &tail)) {
3401 Arguments::set_jvm_flags_file(tail);
3402 continue;
3403 }
3404 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3405 if (vm_options_file_args.found_vm_options_file_arg()) {
3406 jio_fprintf(defaultStream::error_stream(),
3407 "The option '%s' is already specified in the options "
3408 "container '%s' so the specification of '%s' in the "
3409 "same options container is an error.\n",
3410 vm_options_file_args.vm_options_file_arg(),
3411 vm_options_file_args.container_name(),
3412 option->optionString);
3413 return JNI_EINVAL;
3414 }
3415 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3416 // If there's a VMOptionsFile, parse that
3417 jint code = insert_vm_options_file(args, tail, index,
3418 &vm_options_file_args, args_out);
3419 if (code != JNI_OK) {
3420 return code;
3421 }
3422 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3423 if (args_out->is_set()) {
3424 // The VMOptions file inserted some options so switch 'args'
3425 // to the new set of options, and continue processing which
3426 // preserves "last option wins" semantics.
3427 args = args_out->get();
3428 // The first option from the VMOptionsFile replaces the
3429 // current option. So we back track to process the
3430 // replacement option.
3431 index--;
3432 }
3433 continue;
3434 }
3435 if (match_option(option, "-XX:+PrintVMOptions")) {
3436 PrintVMOptions = true;
3437 continue;
3438 }
3439 if (match_option(option, "-XX:-PrintVMOptions")) {
3440 PrintVMOptions = false;
3441 continue;
3442 }
3443 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3444 IgnoreUnrecognizedVMOptions = true;
3445 continue;
3446 }
3447 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3448 IgnoreUnrecognizedVMOptions = false;
3449 continue;
3450 }
3451 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3452 JVMFlag::printFlags(tty, false);
3453 vm_exit(0);
3454 }
3455
3456 #ifndef PRODUCT
3457 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3458 JVMFlag::printFlags(tty, true);
3459 vm_exit(0);
3460 }
3461 #endif
3462 }
3463 return JNI_OK;
3464 }
3465
3466 static void print_options(const JavaVMInitArgs *args) {
3467 const char* tail;
3468 for (int index = 0; index < args->nOptions; index++) {
3469 const JavaVMOption *option = args->options + index;
3470 if (match_option(option, "-XX:", &tail)) {
3471 logOption(tail);
3472 }
3473 }
3474 }
3475
3476 bool Arguments::handle_deprecated_print_gc_flags() {
3477 if (PrintGC) {
3478 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3479 }
3480 if (PrintGCDetails) {
3481 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3482 }
3483
3484 if (_legacyGCLogging.lastFlag == 2) {
3485 // -Xloggc was used to specify a filename
3486 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3487
3488 LogTarget(Error, logging) target;
3489 LogStream errstream(target);
3490 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3491 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3492 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3493 }
3494 return true;
3495 }
3496
3497 static void apply_debugger_ergo() {
3498 #ifdef ASSERT
3499 if (ReplayCompiles) {
3500 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3501 }
3502
3503 if (UseDebuggerErgo) {
3504 // Turn on sub-flags
3505 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3506 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3507 }
3508
3509 if (UseDebuggerErgo2) {
3510 // Debugging with limited number of CPUs
3511 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3512 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3513 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3514 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3515 }
3516 #endif // ASSERT
3517 }
3518
3519 // Parse entry point called from JNI_CreateJavaVM
3520
3521 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3522 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3523 JVMFlag::check_all_flag_declarations();
3524
3525 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3526 const char* hotspotrc = ".hotspotrc";
3527 bool settings_file_specified = false;
3528 bool needs_hotspotrc_warning = false;
3529 ScopedVMInitArgs initial_vm_options_args("");
3530 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3531 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3532 ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'");
3533
3534 // Pointers to current working set of containers
3535 JavaVMInitArgs* cur_cmd_args;
3536 JavaVMInitArgs* cur_vm_options_args;
3537 JavaVMInitArgs* cur_java_options_args;
3538 JavaVMInitArgs* cur_java_tool_options_args;
3539 JavaVMInitArgs* cur_jdk_aot_vm_options_args;
3540
3541 // Containers for modified/expanded options
3542 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3543 ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3544 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3545 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3546 ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'");
3547
3548 GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args;
3549
3550 jint code =
3551 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3552 if (code != JNI_OK) {
3553 return code;
3554 }
3555
3556 // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM.
3557 // This is an undocumented feature.
3558 code = parse_java_options_environment_variable(&initial_java_options_args);
3559 if (code != JNI_OK) {
3560 return code;
3561 }
3562
3563 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3564 char *vmoptions = ClassLoader::lookup_vm_options();
3565 if (vmoptions != nullptr) {
3566 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3567 FREE_C_HEAP_ARRAY(char, vmoptions);
3568 if (code != JNI_OK) {
3569 return code;
3570 }
3571 }
3572
3573 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3574 &mod_java_tool_options_args,
3575 &cur_java_tool_options_args);
3576 if (code != JNI_OK) {
3577 return code;
3578 }
3579
3580 code = expand_vm_options_as_needed(initial_cmd_args,
3581 &mod_cmd_args,
3582 &cur_cmd_args);
3583 if (code != JNI_OK) {
3584 return code;
3585 }
3586
3587 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3588 &mod_java_options_args,
3589 &cur_java_options_args);
3590 if (code != JNI_OK) {
3591 return code;
3592 }
3593
3594 code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3595 &mod_vm_options_args,
3596 &cur_vm_options_args);
3597 if (code != JNI_OK) {
3598 return code;
3599 }
3600
3601 const char* flags_file = Arguments::get_jvm_flags_file();
3602 settings_file_specified = (flags_file != nullptr);
3603
3604 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags.
3605 if (settings_file_specified) {
3606 if (!process_settings_file(flags_file, true,
3607 IgnoreUnrecognizedVMOptions)) {
3608 return JNI_EINVAL;
3609 }
3610 } else {
3611 #ifdef ASSERT
3612 // Parse default .hotspotrc settings file
3613 if (!process_settings_file(".hotspotrc", false,
3614 IgnoreUnrecognizedVMOptions)) {
3615 return JNI_EINVAL;
3616 }
3617 #else
3618 struct stat buf;
3619 if (os::stat(hotspotrc, &buf) == 0) {
3620 needs_hotspotrc_warning = true;
3621 }
3622 #endif
3623 }
3624
3625 // The settings in the args are applied in this order to the the JVM global flags.
3626 // For historical reasons, the order is DIFFERENT than the scanning order of
3627 // the above expand_vm_options_as_needed() calls.
3628 all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE});
3629 all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR});
3630 all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE});
3631 all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR});
3632
3633 // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all
3634 // the options that have been gathered above.
3635 code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args);
3636 if (code != JNI_OK) {
3637 return code;
3638 }
3639 code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(),
3640 &mod_jdk_aot_vm_options_args,
3641 &cur_jdk_aot_vm_options_args);
3642 if (code != JNI_OK) {
3643 return code;
3644 }
3645
3646 for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) {
3647 JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index;
3648 const char* optionString = option->optionString;
3649 if (strstr(optionString, "-XX:AOTMode=") == optionString &&
3650 strcmp(optionString, "-XX:AOTMode=create") != 0) {
3651 jio_fprintf(defaultStream::error_stream(),
3652 "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString);
3653 return JNI_ERR;
3654 }
3655 }
3656
3657 all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR});
3658
3659 if (IgnoreUnrecognizedVMOptions) {
3660 // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of
3661 // the JDK so it shouldn't have bad options.
3662 cur_cmd_args->ignoreUnrecognized = true;
3663 cur_java_tool_options_args->ignoreUnrecognized = true;
3664 cur_java_options_args->ignoreUnrecognized = true;
3665 cur_jdk_aot_vm_options_args->ignoreUnrecognized = true;
3666 }
3667
3668 if (PrintVMOptions) {
3669 // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed.
3670 print_options(cur_java_tool_options_args);
3671 print_options(cur_cmd_args);
3672 print_options(cur_java_options_args);
3673 print_options(cur_jdk_aot_vm_options_args);
3674 }
3675
3676 // Apply the settings in these args to the JVM global flags.
3677 jint result = parse_vm_init_args(&all_args);
3678
3679 if (result != JNI_OK) {
3680 return result;
3681 }
3682
3683 // Delay warning until here so that we've had a chance to process
3684 // the -XX:-PrintWarnings flag
3685 if (needs_hotspotrc_warning) {
3686 warning("%s file is present but has been ignored. "
3687 "Run with -XX:Flags=%s to load the file.",
3688 hotspotrc, hotspotrc);
3689 }
3690
3691 if (needs_module_property_warning) {
3692 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3693 " names that are reserved for internal use.");
3694 }
3695
3696 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3697 UNSUPPORTED_OPTION(UseLargePages);
3698 #endif
3699
3700 #if defined(AIX)
3701 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3702 #endif
3703
3704 #ifndef PRODUCT
3705 if (TraceBytecodesAt != 0) {
3706 TraceBytecodes = true;
3707 }
3708 #endif // PRODUCT
3709
3710 if (ScavengeRootsInCode == 0) {
3711 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3712 warning("Forcing ScavengeRootsInCode non-zero");
3713 }
3714 ScavengeRootsInCode = 1;
3715 }
3716
3717 if (!handle_deprecated_print_gc_flags()) {
3718 return JNI_EINVAL;
3719 }
3720
3721 // Set object alignment values.
3722 set_object_alignment();
3723
3724 #if !INCLUDE_CDS
3725 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3726 jio_fprintf(defaultStream::error_stream(),
3727 "Shared spaces are not supported in this VM\n");
3728 return JNI_ERR;
3729 }
3730 if (DumpLoadedClassList != nullptr) {
3731 jio_fprintf(defaultStream::error_stream(),
3732 "DumpLoadedClassList is not supported in this VM\n");
3733 return JNI_ERR;
3734 }
3735 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3736 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) {
3737 warning("Shared spaces are not supported in this VM");
3738 UseSharedSpaces = false;
3739 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3740 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot));
3741 }
3742 no_shared_spaces("CDS Disabled");
3743 #endif // INCLUDE_CDS
3744
3745 // Verify NMT arguments
3746 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3747 if (lvl == NMT_unknown) {
3748 jio_fprintf(defaultStream::error_stream(),
3749 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3750 return JNI_ERR;
3751 }
3752 if (PrintNMTStatistics && lvl == NMT_off) {
3753 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3754 FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3755 }
3756
3757 bool trace_dependencies = log_is_enabled(Debug, dependencies);
3758 if (trace_dependencies && VerifyDependencies) {
3759 warning("dependency logging results may be inflated by VerifyDependencies");
3760 }
3761
3762 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3763 log_is_enabled(Info, class, load, cause);
3764 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3765 warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3766 }
3767
3768 apply_debugger_ergo();
3769
3770 // The VMThread needs to stop now and then to execute these debug options.
3771 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3772 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3773 }
3774
3775 if (log_is_enabled(Info, arguments)) {
3776 LogStream st(Log(arguments)::info());
3777 Arguments::print_on(&st);
3778 }
3779
3780 return JNI_OK;
3781 }
3782
3783 void Arguments::set_compact_headers_flags() {
3784 #ifdef _LP64
3785 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3786 warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3787 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3788 }
3789 if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3790 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3791 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3792 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3793
3794 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3795 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3796 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3797 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3798 } else {
3799 FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3800 }
3801 }
3802 if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3803 FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3804 }
3805 #endif
3806 }
3807
3808 jint Arguments::apply_ergo() {
3809 // Set flags based on ergonomics.
3810 jint result = set_ergonomics_flags();
3811 if (result != JNI_OK) return result;
3812
3813 // Set heap size based on available physical memory
3814 set_heap_size();
3815
3816 GCConfig::arguments()->initialize();
3817
3818 set_compact_headers_flags();
3819
3820 if (UseCompressedClassPointers) {
3821 CompressedKlassPointers::pre_initialize();
3822 }
3823
3824 CDSConfig::ergo_initialize();
3825
3826 // Initialize Metaspace flags and alignments
3827 Metaspace::ergo_initialize();
3828
3829 if (!StringDedup::ergo_initialize()) {
3830 return JNI_EINVAL;
3831 }
3832
3833 // Set compiler flags after GC is selected and GC specific
3834 // flags (LoopStripMiningIter) are set.
3835 CompilerConfig::ergo_initialize();
3836
3837 // Set bytecode rewriting flags
3838 set_bytecode_flags();
3839
3840 // Set flags if aggressive optimization flags are enabled
3841 jint code = set_aggressive_opts_flags();
3842 if (code != JNI_OK) {
3843 return code;
3844 }
3845
3846 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3847 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3848 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3849 warning("UseSecondarySupersTable is not supported");
3850 FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3851 }
3852 if (!UseSecondarySupersTable) {
3853 FLAG_SET_DEFAULT(StressSecondarySupers, false);
3854 FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3855 }
3856
3857 #ifdef ZERO
3858 // Clear flags not supported on zero.
3859 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3860 #endif // ZERO
3861
3862 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3863 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3864 DebugNonSafepoints = true;
3865 }
3866
3867 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3868 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3869 }
3870
3871 // Treat the odd case where local verification is enabled but remote
3872 // verification is not as if both were enabled.
3873 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3874 log_info(verification)("Turning on remote verification because local verification is on");
3875 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3876 }
3877
3878 #ifndef PRODUCT
3879 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3880 if (use_vm_log()) {
3881 LogVMOutput = true;
3882 }
3883 }
3884 #endif // PRODUCT
3885
3886 if (PrintCommandLineFlags) {
3887 JVMFlag::printSetFlags(tty);
3888 }
3889
3890 #if COMPILER2_OR_JVMCI
3891 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3892 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3893 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3894 }
3895 FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3896
3897 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3898 if (!EnableVectorReboxing) {
3899 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3900 } else {
3901 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3902 }
3903 }
3904 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3905 }
3906 #endif // COMPILER2_OR_JVMCI
3907
3908 #ifdef COMPILER2
3909 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
3910 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
3911 FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
3912 }
3913 #endif // COMPILER2
3914
3915 if (log_is_enabled(Info, init)) {
3916 if (FLAG_IS_DEFAULT(ProfileVMLocks)) {
3917 FLAG_SET_DEFAULT(ProfileVMLocks, true);
3918 }
3919 if (UsePerfData && !log_is_enabled(Info, perf, class, link)) {
3920 // automatically enable -Xlog:perf+class+link
3921 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(perf, class, link));
3922 }
3923 // Don't turn on ProfileVMCalls and ProfileRuntimeCalls by default.
3924 } else {
3925 if (!FLAG_IS_DEFAULT(ProfileVMLocks) && ProfileVMLocks) {
3926 warning("Disabling ProfileVMLocks since logging is turned off.");
3927 FLAG_SET_DEFAULT(ProfileVMLocks, false);
3928 }
3929 if (!FLAG_IS_DEFAULT(ProfileVMCalls) && ProfileVMCalls) {
3930 warning("Disabling ProfileVMCalls since logging is turned off.");
3931 FLAG_SET_DEFAULT(ProfileVMCalls, false);
3932 }
3933 if (!FLAG_IS_DEFAULT(ProfileRuntimeCalls) && ProfileRuntimeCalls) {
3934 warning("Disabling ProfileRuntimeCalls since logging is turned off.");
3935 FLAG_SET_DEFAULT(ProfileRuntimeCalls, false);
3936 }
3937 if (log_is_enabled(Info, perf, class, link)) {
3938 warning("Disabling -Xlog:perf+class+link since logging is turned off.");
3939 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
3940 assert(!log_is_enabled(Info, perf, class, link), "sanity");
3941 }
3942 }
3943 if (FLAG_IS_DEFAULT(PerfDataMemorySize)) {
3944 if (ProfileVMLocks || ProfileVMCalls || ProfileRuntimeCalls) {
3945 FLAG_SET_DEFAULT(PerfDataMemorySize, 128*K); // reserve more space for extra perf counters
3946 }
3947 }
3948
3949 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3950 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3951 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3952 }
3953 }
3954 return JNI_OK;
3955 }
3956
3957 jint Arguments::adjust_after_os() {
3958 if (UseNUMA) {
3959 if (UseParallelGC) {
3960 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3961 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3962 }
3963 }
3964 }
3965 return JNI_OK;
3966 }
3967
3968 int Arguments::PropertyList_count(SystemProperty* pl) {
3969 int count = 0;
3970 while(pl != nullptr) {
3971 count++;
3972 pl = pl->next();
3973 }
3974 return count;
3975 }
3976
3977 // Return the number of readable properties.
3978 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3979 int count = 0;
3980 while(pl != nullptr) {
3981 if (pl->readable()) {
3982 count++;
3983 }
3984 pl = pl->next();
3985 }
3986 return count;
3987 }
3988
3989 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3990 assert(key != nullptr, "just checking");
3991 SystemProperty* prop;
3992 for (prop = pl; prop != nullptr; prop = prop->next()) {
3993 if (strcmp(key, prop->key()) == 0) return prop->value();
3994 }
3995 return nullptr;
3996 }
3997
3998 // Return the value of the requested property provided that it is a readable property.
3999 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4000 assert(key != nullptr, "just checking");
4001 SystemProperty* prop;
4002 // Return the property value if the keys match and the property is not internal or
4003 // it's the special internal property "jdk.boot.class.path.append".
4004 for (prop = pl; prop != nullptr; prop = prop->next()) {
4005 if (strcmp(key, prop->key()) == 0) {
4006 if (!prop->internal()) {
4007 return prop->value();
4008 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4009 return prop->value();
4010 } else {
4011 // Property is internal and not jdk.boot.class.path.append so return null.
4012 return nullptr;
4013 }
4014 }
4015 }
4016 return nullptr;
4017 }
4018
4019 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4020 SystemProperty* p = *plist;
4021 if (p == nullptr) {
4022 *plist = new_p;
4023 } else {
4024 while (p->next() != nullptr) {
4025 p = p->next();
4026 }
4027 p->set_next(new_p);
4028 }
4029 }
4030
4031 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4032 bool writeable, bool internal) {
4033 if (plist == nullptr)
4034 return;
4035
4036 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4037 PropertyList_add(plist, new_p);
4038 }
4039
4040 void Arguments::PropertyList_add(SystemProperty *element) {
4041 PropertyList_add(&_system_properties, element);
4042 }
4043
4044 // This add maintains unique property key in the list.
4045 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4046 PropertyAppendable append, PropertyWriteable writeable,
4047 PropertyInternal internal) {
4048 if (plist == nullptr)
4049 return;
4050
4051 // If property key exists and is writeable, then update with new value.
4052 // Trying to update a non-writeable property is silently ignored.
4053 SystemProperty* prop;
4054 for (prop = *plist; prop != nullptr; prop = prop->next()) {
4055 if (strcmp(k, prop->key()) == 0) {
4056 if (append == AppendProperty) {
4057 prop->append_writeable_value(v);
4058 } else {
4059 prop->set_writeable_value(v);
4060 }
4061 return;
4062 }
4063 }
4064
4065 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4066 }
4067
4068 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4069 // Returns true if all of the source pointed by src has been copied over to
4070 // the destination buffer pointed by buf. Otherwise, returns false.
4071 // Notes:
4072 // 1. If the length (buflen) of the destination buffer excluding the
4073 // null terminator character is not long enough for holding the expanded
4074 // pid characters, it also returns false instead of returning the partially
4075 // expanded one.
4076 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4077 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4078 char* buf, size_t buflen) {
4079 const char* p = src;
4080 char* b = buf;
4081 const char* src_end = &src[srclen];
4082 char* buf_end = &buf[buflen - 1];
4083
4084 while (p < src_end && b < buf_end) {
4085 if (*p == '%') {
4086 switch (*(++p)) {
4087 case '%': // "%%" ==> "%"
4088 *b++ = *p++;
4089 break;
4090 case 'p': { // "%p" ==> current process id
4091 // buf_end points to the character before the last character so
4092 // that we could write '\0' to the end of the buffer.
4093 size_t buf_sz = buf_end - b + 1;
4094 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4095
4096 // if jio_snprintf fails or the buffer is not long enough to hold
4097 // the expanded pid, returns false.
4098 if (ret < 0 || ret >= (int)buf_sz) {
4099 return false;
4100 } else {
4101 b += ret;
4102 assert(*b == '\0', "fail in copy_expand_pid");
4103 if (p == src_end && b == buf_end + 1) {
4104 // reach the end of the buffer.
4105 return true;
4106 }
4107 }
4108 p++;
4109 break;
4110 }
4111 default :
4112 *b++ = '%';
4113 }
4114 } else {
4115 *b++ = *p++;
4116 }
4117 }
4118 *b = '\0';
4119 return (p == src_end); // return false if not all of the source was copied
4120 }